Merge tag 'v3.10' into sdk-kernel-3.10

git rebase --continue Linux 3.10 Conflicts: Documentation/virtual/kvm/api.txt arch/ia64/kvm/Makefile arch/powerpc/Kconfig arch/powerpc/Makefile arch/powerpc/boot/dts/b4420qds.dts arch/powerpc/boot/dts/b4860qds.dts arch/powerpc/boot/dts/b4qds.dts arch/powerpc/boot/dts/fsl/b4420si-post.dtsi arch/powerpc/boot/dts/fsl/b4420si-pre.dtsi arch/powerpc/boot/dts/fsl/b4860si-post.dtsi arch/powerpc/boot/dts/fsl/b4860si-pre.dtsi arch/powerpc/boot/dts/fsl/b4si-post.dtsi arch/powerpc/boot/dts/fsl/p1010si-post.dtsi arch/powerpc/boot/dts/fsl/p2041si-post.dtsi arch/powerpc/boot/dts/fsl/p3041si-post.dtsi arch/powerpc/boot/dts/fsl/p4080si-post.dtsi arch/powerpc/boot/dts/fsl/p5020si-post.dtsi arch/powerpc/boot/dts/fsl/p5040si-post.dtsi arch/powerpc/boot/dts/fsl/qonverge-usb2-dr-0.dtsi arch/powerpc/boot/dts/fsl/qoriq-sec5.0-0.dtsi arch/powerpc/boot/dts/fsl/t4240si-post.dtsi arch/powerpc/boot/dts/fsl/t4240si-pre.dtsi arch/powerpc/boot/dts/p1025rdb_36b.dts arch/powerpc/boot/dts/t4240qds.dts arch/powerpc/configs/corenet64_smp_defconfig arch/powerpc/configs/mpc85xx_defconfig arch/powerpc/configs/mpc85xx_smp_defconfig arch/powerpc/include/asm/cputable.h arch/powerpc/include/asm/kvm_host.h arch/powerpc/include/asm/kvm_ppc.h arch/powerpc/include/asm/machdep.h arch/powerpc/include/uapi/asm/kvm.h arch/powerpc/kernel/cpu_setup_fsl_booke.S arch/powerpc/kernel/cputable.c arch/powerpc/kernel/idle.c arch/powerpc/kernel/pci-common.c arch/powerpc/kvm/Kconfig arch/powerpc/kvm/book3s.c arch/powerpc/kvm/booke.c arch/powerpc/kvm/e500.c arch/powerpc/kvm/e500_mmu.c arch/powerpc/kvm/e500_mmu_host.c arch/powerpc/kvm/e500mc.c arch/powerpc/kvm/emulate.c arch/powerpc/kvm/irq.h arch/powerpc/kvm/mpic.c arch/powerpc/kvm/powerpc.c arch/powerpc/mm/tlb_nohash.c arch/powerpc/platforms/85xx/Kconfig arch/powerpc/platforms/85xx/b4_qds.c arch/powerpc/platforms/85xx/t4240_qds.c arch/powerpc/platforms/pseries/smp.c arch/powerpc/sysdev/fsl_85xx_l2ctlr.c arch/powerpc/sysdev/fsl_msi.c arch/powerpc/sysdev/fsl_pci.c arch/powerpc/sysdev/fsl_pci.h arch/powerpc/sysdev/mpic.c arch/x86/kvm/Makefile arch/x86/kvm/x86.c drivers/Kconfig drivers/clk/Kconfig drivers/cpufreq/Makefile drivers/crypto/caam/caamalg.c drivers/crypto/caam/intern.h drivers/crypto/caam/jr.c drivers/crypto/caam/regs.h drivers/infiniband/ulp/ipoib/ipoib_ethtool.c drivers/iommu/Makefile drivers/iommu/amd_iommu.c drivers/iommu/exynos-iommu.c drivers/iommu/intel-iommu.c drivers/iommu/iommu.c drivers/iommu/msm_iommu.c drivers/iommu/omap-iommu.c drivers/iommu/tegra-gart.c drivers/iommu/tegra-smmu.c drivers/misc/Makefile drivers/mmc/card/block.c drivers/mmc/card/queue.c drivers/mmc/core/core.c drivers/mtd/nand/fsl_ifc_nand.c drivers/net/ethernet/3com/3c501.c drivers/net/ethernet/8390/3c503.c drivers/net/ethernet/dec/ewrk3.c drivers/net/ethernet/freescale/fec.c drivers/net/ethernet/freescale/gianfar.c drivers/net/ethernet/freescale/gianfar.h drivers/net/ethernet/i825xx/3c505.c drivers/net/ethernet/i825xx/3c507.c drivers/rtc/rtc-ds3232.c drivers/s390/net/qeth_core_main.c drivers/staging/Kconfig drivers/staging/Makefile drivers/staging/ccg/u_ether.c drivers/usb/gadget/fsl_udc_core.c drivers/usb/otg/fsl_otg.c drivers/vfio/vfio.c drivers/watchdog/Kconfig include/linux/iommu.h include/linux/kvm_host.h include/linux/mmc/sdhci.h include/linux/msi.h include/linux/netdev_features.h include/linux/pci.h include/linux/skbuff.h include/net/ip6_route.h include/net/sch_generic.h include/net/xfrm.h include/uapi/linux/kvm.h net/core/netpoll.c virt/kvm/irqchip.c virt/kvm/kvm_main.c
author: Scott Wood <scottwood@freescale.com> 2013-11-01 21:17:16 (GMT)
committer: Scott Wood <scottwood@freescale.com> 2013-11-03 22:47:10 (GMT)
commit: 31110de40dca4d4aeff4f253b3def948b88fa590 (patch)
tree: 0d811783836d52f15e37b4244de54f44ed4f93ad /net/ipv4
parent: ae60d5d27c429b13cf28a09ab8b9d30682433c5a (diff)
parent: 8bb495e3f02401ee6f76d1b1d77f3ac9f079e376 (diff)
download: linux-fsl-qoriq-31110de40dca4d4aeff4f253b3def948b88fa590.tar.xz
70 files changed, 3504 insertions, 3762 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 5a19aeb..8603ca8 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -166,6 +166,7 @@ config IP_PNP_RARP
 config NET_IPIP
 	tristate "IP: tunneling"
 	select INET_TUNNEL
+	select NET_IP_TUNNEL
 	---help---
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the
@@ -186,9 +187,14 @@ config NET_IPGRE_DEMUX
 	 This is helper module to demultiplex GRE packets on GRE version field criteria.
 	 Required by ip_gre and pptp modules.
 
+config NET_IP_TUNNEL
+	tristate
+	default n
+
 config NET_IPGRE
 	tristate "IP: GRE tunnels over IP"
 	depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX
+	select NET_IP_TUNNEL
 	help
 	  Tunneling means encapsulating data of one protocol type within
 	  another protocol and sending it over a channel that understands the
@@ -313,6 +319,7 @@ config SYN_COOKIES
 config NET_IPVTI
 	tristate "Virtual (secure) IP: tunneling"
 	select INET_TUNNEL
+	select NET_IP_TUNNEL
 	depends on INET_XFRM_MODE_TUNNEL
 	---help---
 	  Tunneling means encapsulating data of one protocol type within
@@ -488,7 +495,6 @@ config TCP_CONG_HTCP
 
 config TCP_CONG_HSTCP
 	tristate "High Speed TCP"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	Sally Floyd's High Speed TCP (RFC 3649) congestion control.
@@ -499,7 +505,6 @@ config TCP_CONG_HSTCP
 
 config TCP_CONG_HYBLA
 	tristate "TCP-Hybla congestion control algorithm"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	TCP-Hybla is a sender-side only change that eliminates penalization of
@@ -509,7 +514,6 @@ config TCP_CONG_HYBLA
 
 config TCP_CONG_VEGAS
 	tristate "TCP Vegas"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	TCP Vegas is a sender-side only change to TCP that anticipates
@@ -520,7 +524,6 @@ config TCP_CONG_VEGAS
 
 config TCP_CONG_SCALABLE
 	tristate "Scalable TCP"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	Scalable TCP is a sender-side only change to TCP which uses a
@@ -530,7 +533,6 @@ config TCP_CONG_SCALABLE
 
 config TCP_CONG_LP
 	tristate "TCP Low Priority"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	TCP Low Priority (TCP-LP), a distributed algorithm whose goal is
@@ -540,7 +542,6 @@ config TCP_CONG_LP
 
 config TCP_CONG_VENO
 	tristate "TCP Veno"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	TCP Veno is a sender-side only enhancement of TCP to obtain better
@@ -552,7 +553,6 @@ config TCP_CONG_VENO
 
 config TCP_CONG_YEAH
 	tristate "YeAH TCP"
-	depends on EXPERIMENTAL
 	select TCP_CONG_VEGAS
 	default n
 	---help---
@@ -567,7 +567,6 @@ config TCP_CONG_YEAH
 
 config TCP_CONG_ILLINOIS
 	tristate "TCP Illinois"
-	depends on EXPERIMENTAL
 	default n
 	---help---
 	TCP-Illinois is a sender-side modification of TCP Reno for
@@ -631,8 +630,7 @@ config DEFAULT_TCP_CONG
 	default "cubic"
 
 config TCP_MD5SIG
-	bool "TCP: MD5 Signature Option support (RFC2385) (EXPERIMENTAL)"
-	depends on EXPERIMENTAL
+	bool "TCP: MD5 Signature Option support (RFC2385)"
 	select CRYPTO
 	select CRYPTO_MD5
 	---help---
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index 15ca63e..089cb9f 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -13,6 +13,7 @@ obj-y     := route.o inetpeer.o protocol.o \
 	     fib_frontend.o fib_semantics.o fib_trie.o \
 	     inet_fragment.o ping.o
 
+obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
 obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 24b384b..d01be2a 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -111,10 +111,10 @@
 #include <net/sock.h>
 #include <net/raw.h>
 #include <net/icmp.h>
-#include <net/ipip.h>
 #include <net/inet_common.h>
 #include <net/xfrm.h>
 #include <net/net_namespace.h>
+#include <net/secure_seq.h>
 #ifdef CONFIG_IP_MROUTE
 #include <linux/mroute.h>
 #endif
@@ -248,8 +248,12 @@ EXPORT_SYMBOL(inet_listen);
 u32 inet_ehash_secret __read_mostly;
 EXPORT_SYMBOL(inet_ehash_secret);
 
+u32 ipv6_hash_secret __read_mostly;
+EXPORT_SYMBOL(ipv6_hash_secret);
+
 /*
- * inet_ehash_secret must be set exactly once
+ * inet_ehash_secret must be set exactly once, and to a non nul value
+ * ipv6_hash_secret must be set exactly once.
  */
 void build_ehash_secret(void)
 {
@@ -259,24 +263,12 @@ void build_ehash_secret(void)
 		get_random_bytes(&rnd, sizeof(rnd));
 	} while (rnd == 0);
 
-	cmpxchg(&inet_ehash_secret, 0, rnd);
-}
-EXPORT_SYMBOL(build_ehash_secret);
-
-static inline int inet_netns_ok(struct net *net, __u8 protocol)
-{
-	const struct net_protocol *ipprot;
-
-	if (net_eq(net, &init_net))
-		return 1;
-
-	ipprot = rcu_dereference(inet_protos[protocol]);
-	if (ipprot == NULL) {
-		/* raw IP is OK */
-		return 1;
+	if (cmpxchg(&inet_ehash_secret, 0, rnd) == 0) {
+		get_random_bytes(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
+		net_secret_init();
 	}
-	return ipprot->netns_ok;
 }
+EXPORT_SYMBOL(build_ehash_secret);
 
 /*
  *	Create an inet socket.
@@ -350,10 +342,6 @@ lookup_protocol:
 	    !ns_capable(net->user_ns, CAP_NET_RAW))
 		goto out_rcu_unlock;
 
-	err = -EAFNOSUPPORT;
-	if (!inet_netns_ok(net, protocol))
-		goto out_rcu_unlock;
-
 	sock->ops = answer->ops;
 	answer_prot = answer->prot;
 	answer_no_check = answer->no_check;
@@ -1297,15 +1285,16 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	int ihl;
 	int id;
 	unsigned int offset = 0;
-
-	if (!(features & NETIF_F_V4_CSUM))
-		features &= ~NETIF_F_SG;
+	bool tunnel;
 
 	if (unlikely(skb_shinfo(skb)->gso_type &
 		     ~(SKB_GSO_TCPV4 |
 		       SKB_GSO_UDP |
 		       SKB_GSO_DODGY |
 		       SKB_GSO_TCP_ECN |
+		       SKB_GSO_GRE |
+		       SKB_GSO_TCPV6 |
+		       SKB_GSO_UDP_TUNNEL |
 		       0)))
 		goto out;
 
@@ -1320,6 +1309,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 	if (unlikely(!pskb_may_pull(skb, ihl)))
 		goto out;
 
+	tunnel = !!skb->encapsulation;
+
 	__skb_pull(skb, ihl);
 	skb_reset_transport_header(skb);
 	iph = ip_hdr(skb);
@@ -1333,20 +1324,21 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
 		segs = ops->callbacks.gso_segment(skb, features);
 	rcu_read_unlock();
 
-	if (!segs || IS_ERR(segs))
+	if (IS_ERR_OR_NULL(segs))
 		goto out;
 
 	skb = segs;
 	do {
 		iph = ip_hdr(skb);
-		if (proto == IPPROTO_UDP) {
+		if (!tunnel && proto == IPPROTO_UDP) {
 			iph->id = htons(id);
 			iph->frag_off = htons(offset >> 3);
 			if (skb->next != NULL)
 				iph->frag_off |= htons(IP_MF);
 			offset += (skb->len - skb->mac_len - iph->ihl * 4);
-		} else
+		} else  {
 			iph->id = htons(id++);
+		}
 		iph->tot_len = htons(skb->len - skb->mac_len);
 		iph->check = 0;
 		iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
@@ -1590,7 +1582,7 @@ static const struct net_offload udp_offload = {
 
 static const struct net_protocol icmp_protocol = {
 	.handler =	icmp_rcv,
-	.err_handler =	ping_err,
+	.err_handler =	icmp_err,
 	.no_policy =	1,
 	.netns_ok =	1,
 };
@@ -1705,12 +1697,11 @@ static struct packet_type ip_packet_type __read_mostly = {
 
 static int __init inet_init(void)
 {
-	struct sk_buff *dummy_skb;
 	struct inet_protosw *q;
 	struct list_head *r;
 	int rc = -EINVAL;
 
-	BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
+	BUILD_BUG_ON(sizeof(struct inet_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb));
 
 	sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
 	if (!sysctl_local_reserved_ports)
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index a69b4e4..2e7f194 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -321,8 +321,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	/* We are going to _remove_ AH header to keep sockets happy,
 	 * so... Later this can change. */
-	if (skb_cloned(skb) &&
-	    pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+	if (skb_unclone(skb, GFP_ATOMIC))
 		goto out;
 
 	skb->ip_summed = CHECKSUM_NONE;
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index ded146b..247ec19 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -654,11 +654,19 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 	arp_ptr += dev->addr_len;
 	memcpy(arp_ptr, &src_ip, 4);
 	arp_ptr += 4;
-	if (target_hw != NULL)
-		memcpy(arp_ptr, target_hw, dev->addr_len);
-	else
-		memset(arp_ptr, 0, dev->addr_len);
-	arp_ptr += dev->addr_len;
+
+	switch (dev->type) {
+#if IS_ENABLED(CONFIG_FIREWIRE_NET)
+	case ARPHRD_IEEE1394:
+		break;
+#endif
+	default:
+		if (target_hw != NULL)
+			memcpy(arp_ptr, target_hw, dev->addr_len);
+		else
+			memset(arp_ptr, 0, dev->addr_len);
+		arp_ptr += dev->addr_len;
+	}
 	memcpy(arp_ptr, &dest_ip, 4);
 
 	return skb;
@@ -781,7 +789,14 @@ static int arp_process(struct sk_buff *skb)
 	arp_ptr += dev->addr_len;
 	memcpy(&sip, arp_ptr, 4);
 	arp_ptr += 4;
-	arp_ptr += dev->addr_len;
+	switch (dev_type) {
+#if IS_ENABLED(CONFIG_FIREWIRE_NET)
+	case ARPHRD_IEEE1394:
+		break;
+#endif
+	default:
+		arp_ptr += dev->addr_len;
+	}
 	memcpy(&tip, arp_ptr, 4);
 /*
  *	Check for bad requests for 127.x.x.x and requests for multicast
@@ -1405,14 +1420,14 @@ static const struct file_operations arp_seq_fops = {
 
 static int __net_init arp_net_init(struct net *net)
 {
-	if (!proc_net_fops_create(net, "arp", S_IRUGO, &arp_seq_fops))
+	if (!proc_create("arp", S_IRUGO, net->proc_net, &arp_seq_fops))
 		return -ENOMEM;
 	return 0;
 }
 
 static void __net_exit arp_net_exit(struct net *net)
 {
-	proc_net_remove(net, "arp");
+	remove_proc_entry("arp", net->proc_net);
 }
 
 static struct pernet_operations arp_net_ops = {
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a8e4f26..dfc39d4 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -63,6 +63,7 @@
 #include <net/ip_fib.h>
 #include <net/rtnetlink.h>
 #include <net/net_namespace.h>
+#include <net/addrconf.h>
 
 #include "fib_lookup.h"
 
@@ -93,6 +94,7 @@ static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
 	[IFA_ADDRESS]   	= { .type = NLA_U32 },
 	[IFA_BROADCAST] 	= { .type = NLA_U32 },
 	[IFA_LABEL]     	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
+	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
 };
 
 #define IN4_ADDR_HSIZE_SHIFT	8
@@ -137,10 +139,9 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
 	u32 hash = inet_addr_hash(net, addr);
 	struct net_device *result = NULL;
 	struct in_ifaddr *ifa;
-	struct hlist_node *node;
 
 	rcu_read_lock();
-	hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
+	hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
 		if (ifa->ifa_local == addr) {
 			struct net_device *dev = ifa->ifa_dev->dev;
 
@@ -417,6 +418,10 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 	__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
 }
 
+static void check_lifetime(struct work_struct *work);
+
+static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
+
 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 			     u32 portid)
 {
@@ -462,6 +467,9 @@ static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 
 	inet_hash_insert(dev_net(in_dev->dev), ifa);
 
+	cancel_delayed_work(&check_lifetime_work);
+	schedule_delayed_work(&check_lifetime_work, 0);
+
 	/* Send message first, then call notifier.
 	   Notifier will trigger FIB update, so that
 	   listeners of netlink will know about new ifaddr */
@@ -528,7 +536,7 @@ struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 	return NULL;
 }
 
-static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nlattr *tb[IFA_MAX+1];
@@ -573,7 +581,131 @@ errout:
 	return err;
 }
 
-static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
+#define INFINITY_LIFE_TIME	0xFFFFFFFF
+
+static void check_lifetime(struct work_struct *work)
+{
+	unsigned long now, next, next_sec, next_sched;
+	struct in_ifaddr *ifa;
+	struct hlist_node *n;
+	int i;
+
+	now = jiffies;
+	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
+
+	for (i = 0; i < IN4_ADDR_HSIZE; i++) {
+		bool change_needed = false;
+
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
+			unsigned long age;
+
+			if (ifa->ifa_flags & IFA_F_PERMANENT)
+				continue;
+
+			/* We try to batch several events at once. */
+			age = (now - ifa->ifa_tstamp +
+			       ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+			if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
+			    age >= ifa->ifa_valid_lft) {
+				change_needed = true;
+			} else if (ifa->ifa_preferred_lft ==
+				   INFINITY_LIFE_TIME) {
+				continue;
+			} else if (age >= ifa->ifa_preferred_lft) {
+				if (time_before(ifa->ifa_tstamp +
+						ifa->ifa_valid_lft * HZ, next))
+					next = ifa->ifa_tstamp +
+					       ifa->ifa_valid_lft * HZ;
+
+				if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
+					change_needed = true;
+			} else if (time_before(ifa->ifa_tstamp +
+					       ifa->ifa_preferred_lft * HZ,
+					       next)) {
+				next = ifa->ifa_tstamp +
+				       ifa->ifa_preferred_lft * HZ;
+			}
+		}
+		rcu_read_unlock();
+		if (!change_needed)
+			continue;
+		rtnl_lock();
+		hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
+			unsigned long age;
+
+			if (ifa->ifa_flags & IFA_F_PERMANENT)
+				continue;
+
+			/* We try to batch several events at once. */
+			age = (now - ifa->ifa_tstamp +
+			       ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+
+			if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
+			    age >= ifa->ifa_valid_lft) {
+				struct in_ifaddr **ifap;
+
+				for (ifap = &ifa->ifa_dev->ifa_list;
+				     *ifap != NULL; ifap = &(*ifap)->ifa_next) {
+					if (*ifap == ifa) {
+						inet_del_ifa(ifa->ifa_dev,
+							     ifap, 1);
+						break;
+					}
+				}
+			} else if (ifa->ifa_preferred_lft !=
+				   INFINITY_LIFE_TIME &&
+				   age >= ifa->ifa_preferred_lft &&
+				   !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
+				ifa->ifa_flags |= IFA_F_DEPRECATED;
+				rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
+			}
+		}
+		rtnl_unlock();
+	}
+
+	next_sec = round_jiffies_up(next);
+	next_sched = next;
+
+	/* If rounded timeout is accurate enough, accept it. */
+	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
+		next_sched = next_sec;
+
+	now = jiffies;
+	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
+	if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
+		next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
+
+	schedule_delayed_work(&check_lifetime_work, next_sched - now);
+}
+
+static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
+			     __u32 prefered_lft)
+{
+	unsigned long timeout;
+
+	ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
+
+	timeout = addrconf_timeout_fixup(valid_lft, HZ);
+	if (addrconf_finite_timeout(timeout))
+		ifa->ifa_valid_lft = timeout;
+	else
+		ifa->ifa_flags |= IFA_F_PERMANENT;
+
+	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
+	if (addrconf_finite_timeout(timeout)) {
+		if (timeout == 0)
+			ifa->ifa_flags |= IFA_F_DEPRECATED;
+		ifa->ifa_preferred_lft = timeout;
+	}
+	ifa->ifa_tstamp = jiffies;
+	if (!ifa->ifa_cstamp)
+		ifa->ifa_cstamp = ifa->ifa_tstamp;
+}
+
+static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
+				       __u32 *pvalid_lft, __u32 *pprefered_lft)
 {
 	struct nlattr *tb[IFA_MAX+1];
 	struct in_ifaddr *ifa;
@@ -633,24 +765,77 @@ static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh)
 	else
 		memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 
+	if (tb[IFA_CACHEINFO]) {
+		struct ifa_cacheinfo *ci;
+
+		ci = nla_data(tb[IFA_CACHEINFO]);
+		if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
+			err = -EINVAL;
+			goto errout;
+		}
+		*pvalid_lft = ci->ifa_valid;
+		*pprefered_lft = ci->ifa_prefered;
+	}
+
 	return ifa;
 
 errout:
 	return ERR_PTR(err);
 }
 
-static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
+{
+	struct in_device *in_dev = ifa->ifa_dev;
+	struct in_ifaddr *ifa1, **ifap;
+
+	if (!ifa->ifa_local)
+		return NULL;
+
+	for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
+	     ifap = &ifa1->ifa_next) {
+		if (ifa1->ifa_mask == ifa->ifa_mask &&
+		    inet_ifa_match(ifa1->ifa_address, ifa) &&
+		    ifa1->ifa_local == ifa->ifa_local)
+			return ifa1;
+	}
+	return NULL;
+}
+
+static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(skb->sk);
 	struct in_ifaddr *ifa;
+	struct in_ifaddr *ifa_existing;
+	__u32 valid_lft = INFINITY_LIFE_TIME;
+	__u32 prefered_lft = INFINITY_LIFE_TIME;
 
 	ASSERT_RTNL();
 
-	ifa = rtm_to_ifaddr(net, nlh);
+	ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
 	if (IS_ERR(ifa))
 		return PTR_ERR(ifa);
 
-	return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
+	ifa_existing = find_matching_ifa(ifa);
+	if (!ifa_existing) {
+		/* It would be best to check for !NLM_F_CREATE here but
+		 * userspace alreay relies on not having to provide this.
+		 */
+		set_ifa_lifetime(ifa, valid_lft, prefered_lft);
+		return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
+	} else {
+		inet_free_ifa(ifa);
+
+		if (nlh->nlmsg_flags & NLM_F_EXCL ||
+		    !(nlh->nlmsg_flags & NLM_F_REPLACE))
+			return -EEXIST;
+		ifa = ifa_existing;
+		set_ifa_lifetime(ifa, valid_lft, prefered_lft);
+		cancel_delayed_work(&check_lifetime_work);
+		schedule_delayed_work(&check_lifetime_work, 0);
+		rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
+		blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
+	}
+	return 0;
 }
 
 /*
@@ -852,6 +1037,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 			ifa->ifa_prefixlen = 32;
 			ifa->ifa_mask = inet_make_mask(32);
 		}
+		set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
 		ret = inet_set_ifa(dev, ifa);
 		break;
 
@@ -1190,6 +1376,8 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
 				ifa->ifa_dev = in_dev;
 				ifa->ifa_scope = RT_SCOPE_HOST;
 				memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+				set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
+						 INFINITY_LIFE_TIME);
 				inet_insert_ifa(ifa);
 			}
 		}
@@ -1246,11 +1434,30 @@ static size_t inet_nlmsg_size(void)
 	       + nla_total_size(IFNAMSIZ); /* IFA_LABEL */
 }
 
+static inline u32 cstamp_delta(unsigned long cstamp)
+{
+	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
+}
+
+static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
+			 unsigned long tstamp, u32 preferred, u32 valid)
+{
+	struct ifa_cacheinfo ci;
+
+	ci.cstamp = cstamp_delta(cstamp);
+	ci.tstamp = cstamp_delta(tstamp);
+	ci.ifa_prefered = preferred;
+	ci.ifa_valid = valid;
+
+	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
+}
+
 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
 			    u32 portid, u32 seq, int event, unsigned int flags)
 {
 	struct ifaddrmsg *ifm;
 	struct nlmsghdr  *nlh;
+	u32 preferred, valid;
 
 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
 	if (nlh == NULL)
@@ -1259,10 +1466,31 @@ static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
 	ifm = nlmsg_data(nlh);
 	ifm->ifa_family = AF_INET;
 	ifm->ifa_prefixlen = ifa->ifa_prefixlen;
-	ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT;
+	ifm->ifa_flags = ifa->ifa_flags;
 	ifm->ifa_scope = ifa->ifa_scope;
 	ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
 
+	if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
+		preferred = ifa->ifa_preferred_lft;
+		valid = ifa->ifa_valid_lft;
+		if (preferred != INFINITY_LIFE_TIME) {
+			long tval = (jiffies - ifa->ifa_tstamp) / HZ;
+
+			if (preferred > tval)
+				preferred -= tval;
+			else
+				preferred = 0;
+			if (valid != INFINITY_LIFE_TIME) {
+				if (valid > tval)
+					valid -= tval;
+				else
+					valid = 0;
+			}
+		}
+	} else {
+		preferred = INFINITY_LIFE_TIME;
+		valid = INFINITY_LIFE_TIME;
+	}
 	if ((ifa->ifa_address &&
 	     nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) ||
 	    (ifa->ifa_local &&
@@ -1270,7 +1498,9 @@ static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
 	    (ifa->ifa_broadcast &&
 	     nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
 	    (ifa->ifa_label[0] &&
-	     nla_put_string(skb, IFA_LABEL, ifa->ifa_label)))
+	     nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
+	    put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
+			  preferred, valid))
 		goto nla_put_failure;
 
 	return nlmsg_end(skb, nlh);
@@ -1290,7 +1520,6 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 	struct in_device *in_dev;
 	struct in_ifaddr *ifa;
 	struct hlist_head *head;
-	struct hlist_node *node;
 
 	s_h = cb->args[0];
 	s_idx = idx = cb->args[1];
@@ -1300,7 +1529,9 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 		idx = 0;
 		head = &net->dev_index_head[h];
 		rcu_read_lock();
-		hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
+		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
+			  net->dev_base_seq;
+		hlist_for_each_entry_rcu(dev, head, index_hlist) {
 			if (idx < s_idx)
 				goto cont;
 			if (h > s_h || idx > s_idx)
@@ -1320,6 +1551,7 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
 					rcu_read_unlock();
 					goto done;
 				}
+				nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 			}
 cont:
 			idx++;
@@ -1531,8 +1763,7 @@ static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
 };
 
 static int inet_netconf_get_devconf(struct sk_buff *in_skb,
-				    struct nlmsghdr *nlh,
-				    void *arg)
+				    struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(in_skb->sk);
 	struct nlattr *tb[NETCONFA_MAX+1];
@@ -1592,6 +1823,77 @@ errout:
 	return err;
 }
 
+static int inet_netconf_dump_devconf(struct sk_buff *skb,
+				     struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	int h, s_h;
+	int idx, s_idx;
+	struct net_device *dev;
+	struct in_device *in_dev;
+	struct hlist_head *head;
+
+	s_h = cb->args[0];
+	s_idx = idx = cb->args[1];
+
+	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
+		idx = 0;
+		head = &net->dev_index_head[h];
+		rcu_read_lock();
+		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
+			  net->dev_base_seq;
+		hlist_for_each_entry_rcu(dev, head, index_hlist) {
+			if (idx < s_idx)
+				goto cont;
+			in_dev = __in_dev_get_rcu(dev);
+			if (!in_dev)
+				goto cont;
+
+			if (inet_netconf_fill_devconf(skb, dev->ifindex,
+						      &in_dev->cnf,
+						      NETLINK_CB(cb->skb).portid,
+						      cb->nlh->nlmsg_seq,
+						      RTM_NEWNETCONF,
+						      NLM_F_MULTI,
+						      -1) <= 0) {
+				rcu_read_unlock();
+				goto done;
+			}
+			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
+cont:
+			idx++;
+		}
+		rcu_read_unlock();
+	}
+	if (h == NETDEV_HASHENTRIES) {
+		if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
+					      net->ipv4.devconf_all,
+					      NETLINK_CB(cb->skb).portid,
+					      cb->nlh->nlmsg_seq,
+					      RTM_NEWNETCONF, NLM_F_MULTI,
+					      -1) <= 0)
+			goto done;
+		else
+			h++;
+	}
+	if (h == NETDEV_HASHENTRIES + 1) {
+		if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
+					      net->ipv4.devconf_dflt,
+					      NETLINK_CB(cb->skb).portid,
+					      cb->nlh->nlmsg_seq,
+					      RTM_NEWNETCONF, NLM_F_MULTI,
+					      -1) <= 0)
+			goto done;
+		else
+			h++;
+	}
+done:
+	cb->args[0] = h;
+	cb->args[1] = idx;
+
+	return skb->len;
+}
+
 #ifdef CONFIG_SYSCTL
 
 static void devinet_copy_dflt_conf(struct net *net, int i)
@@ -1988,12 +2290,14 @@ void __init devinet_init(void)
 	register_gifconf(PF_INET, inet_gifconf);
 	register_netdevice_notifier(&ip_netdev_notifier);
 
+	schedule_delayed_work(&check_lifetime_work, 0);
+
 	rtnl_af_register(&inet_af_ops);
 
 	rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
 	rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
 	rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
 	rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
-		      NULL, NULL);
+		      inet_netconf_dump_devconf, NULL);
 }
 
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 3b4f0cd..4cfe34d 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -139,8 +139,6 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 
 	/* skb is pure payload to encrypt */
 
-	err = -ENOMEM;
-
 	esp = x->data;
 	aead = esp->aead;
 	alen = crypto_aead_authsize(aead);
@@ -176,8 +174,10 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
 	}
 
 	tmp = esp_alloc_tmp(aead, nfrags + sglists, seqhilen);
-	if (!tmp)
+	if (!tmp) {
+		err = -ENOMEM;
 		goto error;
+	}
 
 	seqhi = esp_tmp_seqhi(tmp);
 	iv = esp_tmp_iv(aead, tmp, seqhilen);
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 5cd75e2..c7629a2 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -112,7 +112,6 @@ struct fib_table *fib_new_table(struct net *net, u32 id)
 struct fib_table *fib_get_table(struct net *net, u32 id)
 {
 	struct fib_table *tb;
-	struct hlist_node *node;
 	struct hlist_head *head;
 	unsigned int h;
 
@@ -122,7 +121,7 @@ struct fib_table *fib_get_table(struct net *net, u32 id)
 
 	rcu_read_lock();
 	head = &net->ipv4.fib_table_hash[h];
-	hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
+	hlist_for_each_entry_rcu(tb, head, tb_hlist) {
 		if (tb->tb_id == id) {
 			rcu_read_unlock();
 			return tb;
@@ -137,13 +136,12 @@ static void fib_flush(struct net *net)
 {
 	int flushed = 0;
 	struct fib_table *tb;
-	struct hlist_node *node;
 	struct hlist_head *head;
 	unsigned int h;
 
 	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
 		head = &net->ipv4.fib_table_hash[h];
-		hlist_for_each_entry(tb, node, head, tb_hlist)
+		hlist_for_each_entry(tb, head, tb_hlist)
 			flushed += fib_table_flush(tb);
 	}
 
@@ -606,7 +604,7 @@ errout:
 	return err;
 }
 
-static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(skb->sk);
 	struct fib_config cfg;
@@ -628,7 +626,7 @@ errout:
 	return err;
 }
 
-static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(skb->sk);
 	struct fib_config cfg;
@@ -656,7 +654,6 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 	unsigned int h, s_h;
 	unsigned int e = 0, s_e;
 	struct fib_table *tb;
-	struct hlist_node *node;
 	struct hlist_head *head;
 	int dumped = 0;
 
@@ -670,7 +667,7 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
 	for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
 		e = 0;
 		head = &net->ipv4.fib_table_hash[h];
-		hlist_for_each_entry(tb, node, head, tb_hlist) {
+		hlist_for_each_entry(tb, head, tb_hlist) {
 			if (e < s_e)
 				goto next;
 			if (dumped)
@@ -960,8 +957,8 @@ static void nl_fib_input(struct sk_buff *skb)
 
 	net = sock_net(skb->sk);
 	nlh = nlmsg_hdr(skb);
-	if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
-	    nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
+	if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len ||
+	    nlmsg_len(nlh) < sizeof(*frn))
 		return;
 
 	skb = skb_clone(skb, GFP_KERNEL);
@@ -969,12 +966,12 @@ static void nl_fib_input(struct sk_buff *skb)
 		return;
 	nlh = nlmsg_hdr(skb);
 
-	frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
+	frn = (struct fib_result_nl *) nlmsg_data(nlh);
 	tb = fib_get_table(net, frn->tb_id_in);
 
 	nl_fib_lookup(frn, tb);
 
-	portid = NETLINK_CB(skb).portid;      /* pid of sending process */
+	portid = NETLINK_CB(skb).portid;      /* netlink portid */
 	NETLINK_CB(skb).portid = 0;        /* from kernel */
 	NETLINK_CB(skb).dst_group = 0;  /* unicast */
 	netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
@@ -1117,11 +1114,11 @@ static void ip_fib_net_exit(struct net *net)
 	for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
 		struct fib_table *tb;
 		struct hlist_head *head;
-		struct hlist_node *node, *tmp;
+		struct hlist_node *tmp;
 
 		head = &net->ipv4.fib_table_hash[i];
-		hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
-			hlist_del(node);
+		hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
+			hlist_del(&tb->tb_hlist);
 			fib_table_flush(tb);
 			fib_free_table(tb);
 		}
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 4797a80..8f6cb7a 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -298,14 +298,13 @@ static inline unsigned int fib_info_hashfn(const struct fib_info *fi)
 static struct fib_info *fib_find_info(const struct fib_info *nfi)
 {
 	struct hlist_head *head;
-	struct hlist_node *node;
 	struct fib_info *fi;
 	unsigned int hash;
 
 	hash = fib_info_hashfn(nfi);
 	head = &fib_info_hash[hash];
 
-	hlist_for_each_entry(fi, node, head, fib_hash) {
+	hlist_for_each_entry(fi, head, fib_hash) {
 		if (!net_eq(fi->fib_net, nfi->fib_net))
 			continue;
 		if (fi->fib_nhs != nfi->fib_nhs)
@@ -331,7 +330,6 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
 int ip_fib_check_default(__be32 gw, struct net_device *dev)
 {
 	struct hlist_head *head;
-	struct hlist_node *node;
 	struct fib_nh *nh;
 	unsigned int hash;
 
@@ -339,7 +337,7 @@ int ip_fib_check_default(__be32 gw, struct net_device *dev)
 
 	hash = fib_devindex_hashfn(dev->ifindex);
 	head = &fib_info_devhash[hash];
-	hlist_for_each_entry(nh, node, head, nh_hash) {
+	hlist_for_each_entry(nh, head, nh_hash) {
 		if (nh->nh_dev == dev &&
 		    nh->nh_gw == gw &&
 		    !(nh->nh_flags & RTNH_F_DEAD)) {
@@ -721,10 +719,10 @@ static void fib_info_hash_move(struct hlist_head *new_info_hash,
 
 	for (i = 0; i < old_size; i++) {
 		struct hlist_head *head = &fib_info_hash[i];
-		struct hlist_node *node, *n;
+		struct hlist_node *n;
 		struct fib_info *fi;
 
-		hlist_for_each_entry_safe(fi, node, n, head, fib_hash) {
+		hlist_for_each_entry_safe(fi, n, head, fib_hash) {
 			struct hlist_head *dest;
 			unsigned int new_hash;
 
@@ -739,10 +737,10 @@ static void fib_info_hash_move(struct hlist_head *new_info_hash,
 
 	for (i = 0; i < old_size; i++) {
 		struct hlist_head *lhead = &fib_info_laddrhash[i];
-		struct hlist_node *node, *n;
+		struct hlist_node *n;
 		struct fib_info *fi;
 
-		hlist_for_each_entry_safe(fi, node, n, lhead, fib_lhash) {
+		hlist_for_each_entry_safe(fi, n, lhead, fib_lhash) {
 			struct hlist_head *ldest;
 			unsigned int new_hash;
 
@@ -1096,13 +1094,12 @@ int fib_sync_down_addr(struct net *net, __be32 local)
 	int ret = 0;
 	unsigned int hash = fib_laddr_hashfn(local);
 	struct hlist_head *head = &fib_info_laddrhash[hash];
-	struct hlist_node *node;
 	struct fib_info *fi;
 
 	if (fib_info_laddrhash == NULL || local == 0)
 		return 0;
 
-	hlist_for_each_entry(fi, node, head, fib_lhash) {
+	hlist_for_each_entry(fi, head, fib_lhash) {
 		if (!net_eq(fi->fib_net, net))
 			continue;
 		if (fi->fib_prefsrc == local) {
@@ -1120,13 +1117,12 @@ int fib_sync_down_dev(struct net_device *dev, int force)
 	struct fib_info *prev_fi = NULL;
 	unsigned int hash = fib_devindex_hashfn(dev->ifindex);
 	struct hlist_head *head = &fib_info_devhash[hash];
-	struct hlist_node *node;
 	struct fib_nh *nh;
 
 	if (force)
 		scope = -1;
 
-	hlist_for_each_entry(nh, node, head, nh_hash) {
+	hlist_for_each_entry(nh, head, nh_hash) {
 		struct fib_info *fi = nh->nh_parent;
 		int dead;
 
@@ -1232,7 +1228,6 @@ int fib_sync_up(struct net_device *dev)
 	struct fib_info *prev_fi;
 	unsigned int hash;
 	struct hlist_head *head;
-	struct hlist_node *node;
 	struct fib_nh *nh;
 	int ret;
 
@@ -1244,7 +1239,7 @@ int fib_sync_up(struct net_device *dev)
 	head = &fib_info_devhash[hash];
 	ret = 0;
 
-	hlist_for_each_entry(nh, node, head, nh_hash) {
+	hlist_for_each_entry(nh, head, nh_hash) {
 		struct fib_info *fi = nh->nh_parent;
 		int alive;
 
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 31d771c..49616fe 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -125,7 +125,6 @@ struct tnode {
 	unsigned int empty_children;	/* KEYLENGTH bits needed */
 	union {
 		struct rcu_head rcu;
-		struct work_struct work;
 		struct tnode *tnode_free;
 	};
 	struct rt_trie_node __rcu *child[0];
@@ -383,12 +382,6 @@ static struct tnode *tnode_alloc(size_t size)
 		return vzalloc(size);
 }
 
-static void __tnode_vfree(struct work_struct *arg)
-{
-	struct tnode *tn = container_of(arg, struct tnode, work);
-	vfree(tn);
-}
-
 static void __tnode_free_rcu(struct rcu_head *head)
 {
 	struct tnode *tn = container_of(head, struct tnode, rcu);
@@ -397,10 +390,8 @@ static void __tnode_free_rcu(struct rcu_head *head)
 
 	if (size <= PAGE_SIZE)
 		kfree(tn);
-	else {
-		INIT_WORK(&tn->work, __tnode_vfree);
-		schedule_work(&tn->work);
-	}
+	else
+		vfree(tn);
 }
 
 static inline void tnode_free(struct tnode *tn)
@@ -920,10 +911,9 @@ nomem:
 static struct leaf_info *find_leaf_info(struct leaf *l, int plen)
 {
 	struct hlist_head *head = &l->list;
-	struct hlist_node *node;
 	struct leaf_info *li;
 
-	hlist_for_each_entry_rcu(li, node, head, hlist)
+	hlist_for_each_entry_rcu(li, head, hlist)
 		if (li->plen == plen)
 			return li;
 
@@ -943,12 +933,11 @@ static inline struct list_head *get_fa_head(struct leaf *l, int plen)
 static void insert_leaf_info(struct hlist_head *head, struct leaf_info *new)
 {
 	struct leaf_info *li = NULL, *last = NULL;
-	struct hlist_node *node;
 
 	if (hlist_empty(head)) {
 		hlist_add_head_rcu(&new->hlist, head);
 	} else {
-		hlist_for_each_entry(li, node, head, hlist) {
+		hlist_for_each_entry(li, head, hlist) {
 			if (new->plen > li->plen)
 				break;
 
@@ -1354,9 +1343,8 @@ static int check_leaf(struct fib_table *tb, struct trie *t, struct leaf *l,
 {
 	struct leaf_info *li;
 	struct hlist_head *hhead = &l->list;
-	struct hlist_node *node;
 
-	hlist_for_each_entry_rcu(li, node, hhead, hlist) {
+	hlist_for_each_entry_rcu(li, hhead, hlist) {
 		struct fib_alias *fa;
 
 		if (l->key != (key & li->mask_plen))
@@ -1740,10 +1728,10 @@ static int trie_flush_leaf(struct leaf *l)
 {
 	int found = 0;
 	struct hlist_head *lih = &l->list;
-	struct hlist_node *node, *tmp;
+	struct hlist_node *tmp;
 	struct leaf_info *li = NULL;
 
-	hlist_for_each_entry_safe(li, node, tmp, lih, hlist) {
+	hlist_for_each_entry_safe(li, tmp, lih, hlist) {
 		found += trie_flush_list(&li->falh);
 
 		if (list_empty(&li->falh)) {
@@ -1895,14 +1883,13 @@ static int fn_trie_dump_leaf(struct leaf *l, struct fib_table *tb,
 			struct sk_buff *skb, struct netlink_callback *cb)
 {
 	struct leaf_info *li;
-	struct hlist_node *node;
 	int i, s_i;
 
 	s_i = cb->args[4];
 	i = 0;
 
 	/* rcu_read_lock is hold by caller */
-	hlist_for_each_entry_rcu(li, node, &l->list, hlist) {
+	hlist_for_each_entry_rcu(li, &l->list, hlist) {
 		if (i < s_i) {
 			i++;
 			continue;
@@ -2092,14 +2079,13 @@ static void trie_collect_stats(struct trie *t, struct trie_stat *s)
 		if (IS_LEAF(n)) {
 			struct leaf *l = (struct leaf *)n;
 			struct leaf_info *li;
-			struct hlist_node *tmp;
 
 			s->leaves++;
 			s->totdepth += iter.depth;
 			if (iter.depth > s->maxdepth)
 				s->maxdepth = iter.depth;
 
-			hlist_for_each_entry_rcu(li, tmp, &l->list, hlist)
+			hlist_for_each_entry_rcu(li, &l->list, hlist)
 				++s->prefixes;
 		} else {
 			const struct tnode *tn = (const struct tnode *) n;
@@ -2200,10 +2186,9 @@ static int fib_triestat_seq_show(struct seq_file *seq, void *v)
 
 	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
 		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
-		struct hlist_node *node;
 		struct fib_table *tb;
 
-		hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
+		hlist_for_each_entry_rcu(tb, head, tb_hlist) {
 			struct trie *t = (struct trie *) tb->tb_data;
 			struct trie_stat stat;
 
@@ -2245,10 +2230,9 @@ static struct rt_trie_node *fib_trie_get_idx(struct seq_file *seq, loff_t pos)
 
 	for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
 		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
-		struct hlist_node *node;
 		struct fib_table *tb;
 
-		hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
+		hlist_for_each_entry_rcu(tb, head, tb_hlist) {
 			struct rt_trie_node *n;
 
 			for (n = fib_trie_get_first(iter,
@@ -2298,7 +2282,7 @@ static void *fib_trie_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 	/* new hash chain */
 	while (++h < FIB_TABLE_HASHSZ) {
 		struct hlist_head *head = &net->ipv4.fib_table_hash[h];
-		hlist_for_each_entry_rcu(tb, tb_node, head, tb_hlist) {
+		hlist_for_each_entry_rcu(tb, head, tb_hlist) {
 			n = fib_trie_get_first(iter, (struct trie *) tb->tb_data);
 			if (n)
 				goto found;
@@ -2381,13 +2365,12 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
 	} else {
 		struct leaf *l = (struct leaf *) n;
 		struct leaf_info *li;
-		struct hlist_node *node;
 		__be32 val = htonl(l->key);
 
 		seq_indent(seq, iter->depth);
 		seq_printf(seq, "  |-- %pI4\n", &val);
 
-		hlist_for_each_entry_rcu(li, node, &l->list, hlist) {
+		hlist_for_each_entry_rcu(li, &l->list, hlist) {
 			struct fib_alias *fa;
 
 			list_for_each_entry_rcu(fa, &li->falh, fa_list) {
@@ -2532,7 +2515,6 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 {
 	struct leaf *l = v;
 	struct leaf_info *li;
-	struct hlist_node *node;
 
 	if (v == SEQ_START_TOKEN) {
 		seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
@@ -2541,7 +2523,7 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 		return 0;
 	}
 
-	hlist_for_each_entry_rcu(li, node, &l->list, hlist) {
+	hlist_for_each_entry_rcu(li, &l->list, hlist) {
 		struct fib_alias *fa;
 		__be32 mask, prefix;
 
@@ -2607,31 +2589,31 @@ static const struct file_operations fib_route_fops = {
 
 int __net_init fib_proc_init(struct net *net)
 {
-	if (!proc_net_fops_create(net, "fib_trie", S_IRUGO, &fib_trie_fops))
+	if (!proc_create("fib_trie", S_IRUGO, net->proc_net, &fib_trie_fops))
 		goto out1;
 
-	if (!proc_net_fops_create(net, "fib_triestat", S_IRUGO,
-				  &fib_triestat_fops))
+	if (!proc_create("fib_triestat", S_IRUGO, net->proc_net,
+			 &fib_triestat_fops))
 		goto out2;
 
-	if (!proc_net_fops_create(net, "route", S_IRUGO, &fib_route_fops))
+	if (!proc_create("route", S_IRUGO, net->proc_net, &fib_route_fops))
 		goto out3;
 
 	return 0;
 
 out3:
-	proc_net_remove(net, "fib_triestat");
+	remove_proc_entry("fib_triestat", net->proc_net);
 out2:
-	proc_net_remove(net, "fib_trie");
+	remove_proc_entry("fib_trie", net->proc_net);
 out1:
 	return -ENOMEM;
 }
 
 void __net_exit fib_proc_exit(struct net *net)
 {
-	proc_net_remove(net, "fib_trie");
-	proc_net_remove(net, "fib_triestat");
-	proc_net_remove(net, "route");
+	remove_proc_entry("fib_trie", net->proc_net);
+	remove_proc_entry("fib_triestat", net->proc_net);
+	remove_proc_entry("route", net->proc_net);
 }
 
 #endif /* CONFIG_PROC_FS */
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 42a4910..7856d16 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -19,6 +19,7 @@
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <linux/netdevice.h>
+#include <linux/if_tunnel.h>
 #include <linux/spinlock.h>
 #include <net/protocol.h>
 #include <net/gre.h>
@@ -112,12 +113,113 @@ static void gre_err(struct sk_buff *skb, u32 info)
 	rcu_read_unlock();
 }
 
+static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
+				       netdev_features_t features)
+{
+	struct sk_buff *segs = ERR_PTR(-EINVAL);
+	netdev_features_t enc_features;
+	int ghl = GRE_HEADER_SECTION;
+	struct gre_base_hdr *greh;
+	int mac_len = skb->mac_len;
+	__be16 protocol = skb->protocol;
+	int tnl_hlen;
+	bool csum;
+
+	if (unlikely(skb_shinfo(skb)->gso_type &
+				~(SKB_GSO_TCPV4 |
+				  SKB_GSO_TCPV6 |
+				  SKB_GSO_UDP |
+				  SKB_GSO_DODGY |
+				  SKB_GSO_TCP_ECN |
+				  SKB_GSO_GRE)))
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, sizeof(*greh))))
+		goto out;
+
+	greh = (struct gre_base_hdr *)skb_transport_header(skb);
+
+	if (greh->flags & GRE_KEY)
+		ghl += GRE_HEADER_SECTION;
+	if (greh->flags & GRE_SEQ)
+		ghl += GRE_HEADER_SECTION;
+	if (greh->flags & GRE_CSUM) {
+		ghl += GRE_HEADER_SECTION;
+		csum = true;
+	} else
+		csum = false;
+
+	/* setup inner skb. */
+	skb->protocol = greh->protocol;
+	skb->encapsulation = 0;
+
+	if (unlikely(!pskb_may_pull(skb, ghl)))
+		goto out;
+	__skb_pull(skb, ghl);
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb_inner_network_offset(skb));
+	skb->mac_len = skb_inner_network_offset(skb);
+
+	/* segment inner packet. */
+	enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
+	segs = skb_mac_gso_segment(skb, enc_features);
+	if (!segs || IS_ERR(segs))
+		goto out;
+
+	skb = segs;
+	tnl_hlen = skb_tnl_header_len(skb);
+	do {
+		__skb_push(skb, ghl);
+		if (csum) {
+			__be32 *pcsum;
+
+			if (skb_has_shared_frag(skb)) {
+				int err;
+
+				err = __skb_linearize(skb);
+				if (err) {
+					kfree_skb_list(segs);
+					segs = ERR_PTR(err);
+					goto out;
+				}
+			}
+
+			greh = (struct gre_base_hdr *)(skb->data);
+			pcsum = (__be32 *)(greh + 1);
+			*pcsum = 0;
+			*(__sum16 *)pcsum = csum_fold(skb_checksum(skb, 0, skb->len, 0));
+		}
+		__skb_push(skb, tnl_hlen - ghl);
+
+		skb_reset_mac_header(skb);
+		skb_set_network_header(skb, mac_len);
+		skb->mac_len = mac_len;
+		skb->protocol = protocol;
+	} while ((skb = skb->next));
+out:
+	return segs;
+}
+
+static int gre_gso_send_check(struct sk_buff *skb)
+{
+	if (!skb->encapsulation)
+		return -EINVAL;
+	return 0;
+}
+
 static const struct net_protocol net_gre_protocol = {
 	.handler     = gre_rcv,
 	.err_handler = gre_err,
 	.netns_ok    = 1,
 };
 
+static const struct net_offload gre_offload = {
+	.callbacks = {
+		.gso_send_check =	gre_gso_send_check,
+		.gso_segment    =	gre_gso_segment,
+	},
+};
+
 static int __init gre_init(void)
 {
 	pr_info("GRE over IPv4 demultiplexor driver\n");
@@ -127,11 +229,18 @@ static int __init gre_init(void)
 		return -EAGAIN;
 	}
 
+	if (inet_add_offload(&gre_offload, IPPROTO_GRE)) {
+		pr_err("can't add protocol offload\n");
+		inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
+		return -EAGAIN;
+	}
+
 	return 0;
 }
 
 static void __exit gre_exit(void)
 {
+	inet_del_offload(&gre_offload, IPPROTO_GRE);
 	inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
 }
 
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 17ff9fd..76e10b4 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -881,7 +881,7 @@ int icmp_rcv(struct sk_buff *skb)
 	case CHECKSUM_NONE:
 		skb->csum = 0;
 		if (__skb_checksum_complete(skb))
-			goto error;
+			goto csum_error;
 	}
 
 	if (!pskb_pull(skb, sizeof(*icmph)))
@@ -929,11 +929,36 @@ int icmp_rcv(struct sk_buff *skb)
 drop:
 	kfree_skb(skb);
 	return 0;
+csum_error:
+	ICMP_INC_STATS_BH(net, ICMP_MIB_CSUMERRORS);
 error:
 	ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
 	goto drop;
 }
 
+void icmp_err(struct sk_buff *skb, u32 info)
+{
+	struct iphdr *iph = (struct iphdr *)skb->data;
+	struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
+	int type = icmp_hdr(skb)->type;
+	int code = icmp_hdr(skb)->code;
+	struct net *net = dev_net(skb->dev);
+
+	/*
+	 * Use ping_err to handle all icmp errors except those
+	 * triggered by ICMP_ECHOREPLY which sent from kernel.
+	 */
+	if (icmph->type != ICMP_ECHOREPLY) {
+		ping_err(skb, info);
+		return;
+	}
+
+	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
+		ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_ICMP, 0);
+	else if (type == ICMP_REDIRECT)
+		ipv4_redirect(skb, net, 0, 0, IPPROTO_ICMP, 0);
+}
+
 /*
  *	This table is the definition of how we handle ICMP.
  */
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 736ab70..d8c2327 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2646,24 +2646,25 @@ static int __net_init igmp_net_init(struct net *net)
 {
 	struct proc_dir_entry *pde;
 
-	pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
+	pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
 	if (!pde)
 		goto out_igmp;
-	pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
+	pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
+			  &igmp_mcf_seq_fops);
 	if (!pde)
 		goto out_mcfilter;
 	return 0;
 
 out_mcfilter:
-	proc_net_remove(net, "igmp");
+	remove_proc_entry("igmp", net->proc_net);
 out_igmp:
 	return -ENOMEM;
 }
 
 static void __net_exit igmp_net_exit(struct net *net)
 {
-	proc_net_remove(net, "mcfilter");
-	proc_net_remove(net, "igmp");
+	remove_proc_entry("mcfilter", net->proc_net);
+	remove_proc_entry("igmp", net->proc_net);
 }
 
 static struct pernet_operations igmp_net_ops = {
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index d0670f0..6acb541 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -57,8 +57,9 @@ int inet_csk_bind_conflict(const struct sock *sk,
 			   const struct inet_bind_bucket *tb, bool relax)
 {
 	struct sock *sk2;
-	struct hlist_node *node;
 	int reuse = sk->sk_reuse;
+	int reuseport = sk->sk_reuseport;
+	kuid_t uid = sock_i_uid((struct sock *)sk);
 
 	/*
 	 * Unlike other sk lookup places we do not check
@@ -67,14 +68,17 @@ int inet_csk_bind_conflict(const struct sock *sk,
 	 * one this bucket belongs to.
 	 */
 
-	sk_for_each_bound(sk2, node, &tb->owners) {
+	sk_for_each_bound(sk2, &tb->owners) {
 		if (sk != sk2 &&
 		    !inet_v6_ipv6only(sk2) &&
 		    (!sk->sk_bound_dev_if ||
 		     !sk2->sk_bound_dev_if ||
 		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
-			if (!reuse || !sk2->sk_reuse ||
-			    sk2->sk_state == TCP_LISTEN) {
+			if ((!reuse || !sk2->sk_reuse ||
+			    sk2->sk_state == TCP_LISTEN) &&
+			    (!reuseport || !sk2->sk_reuseport ||
+			    (sk2->sk_state != TCP_TIME_WAIT &&
+			     !uid_eq(uid, sock_i_uid(sk2))))) {
 				const __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
 				if (!sk2_rcv_saddr || !sk_rcv_saddr(sk) ||
 				    sk2_rcv_saddr == sk_rcv_saddr(sk))
@@ -90,7 +94,7 @@ int inet_csk_bind_conflict(const struct sock *sk,
 			}
 		}
 	}
-	return node != NULL;
+	return sk2 != NULL;
 }
 EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
 
@@ -101,11 +105,11 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 {
 	struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
 	struct inet_bind_hashbucket *head;
-	struct hlist_node *node;
 	struct inet_bind_bucket *tb;
 	int ret, attempts = 5;
 	struct net *net = sock_net(sk);
 	int smallest_size = -1, smallest_rover;
+	kuid_t uid = sock_i_uid(sk);
 
 	local_bh_disable();
 	if (!snum) {
@@ -123,11 +127,14 @@ again:
 			head = &hashinfo->bhash[inet_bhashfn(net, rover,
 					hashinfo->bhash_size)];
 			spin_lock(&head->lock);
-			inet_bind_bucket_for_each(tb, node, &head->chain)
+			inet_bind_bucket_for_each(tb, &head->chain)
 				if (net_eq(ib_net(tb), net) && tb->port == rover) {
-					if (tb->fastreuse > 0 &&
-					    sk->sk_reuse &&
-					    sk->sk_state != TCP_LISTEN &&
+					if (((tb->fastreuse > 0 &&
+					      sk->sk_reuse &&
+					      sk->sk_state != TCP_LISTEN) ||
+					     (tb->fastreuseport > 0 &&
+					      sk->sk_reuseport &&
+					      uid_eq(tb->fastuid, uid))) &&
 					    (tb->num_owners < smallest_size || smallest_size == -1)) {
 						smallest_size = tb->num_owners;
 						smallest_rover = rover;
@@ -174,7 +181,7 @@ have_snum:
 		head = &hashinfo->bhash[inet_bhashfn(net, snum,
 				hashinfo->bhash_size)];
 		spin_lock(&head->lock);
-		inet_bind_bucket_for_each(tb, node, &head->chain)
+		inet_bind_bucket_for_each(tb, &head->chain)
 			if (net_eq(ib_net(tb), net) && tb->port == snum)
 				goto tb_found;
 	}
@@ -185,14 +192,18 @@ tb_found:
 		if (sk->sk_reuse == SK_FORCE_REUSE)
 			goto success;
 
-		if (tb->fastreuse > 0 &&
-		    sk->sk_reuse && sk->sk_state != TCP_LISTEN &&
+		if (((tb->fastreuse > 0 &&
+		      sk->sk_reuse && sk->sk_state != TCP_LISTEN) ||
+		     (tb->fastreuseport > 0 &&
+		      sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
 		    smallest_size == -1) {
 			goto success;
 		} else {
 			ret = 1;
 			if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) {
-				if (sk->sk_reuse && sk->sk_state != TCP_LISTEN &&
+				if (((sk->sk_reuse && sk->sk_state != TCP_LISTEN) ||
+				     (tb->fastreuseport > 0 &&
+				      sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
 				    smallest_size != -1 && --attempts >= 0) {
 					spin_unlock(&head->lock);
 					goto again;
@@ -212,9 +223,19 @@ tb_not_found:
 			tb->fastreuse = 1;
 		else
 			tb->fastreuse = 0;
-	} else if (tb->fastreuse &&
-		   (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
-		tb->fastreuse = 0;
+		if (sk->sk_reuseport) {
+			tb->fastreuseport = 1;
+			tb->fastuid = uid;
+		} else
+			tb->fastreuseport = 0;
+	} else {
+		if (tb->fastreuse &&
+		    (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
+			tb->fastreuse = 0;
+		if (tb->fastreuseport &&
+		    (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid)))
+			tb->fastreuseport = 0;
+	}
 success:
 	if (!inet_csk(sk)->icsk_bind_hash)
 		inet_bind_hash(sk, tb, snum);
@@ -538,7 +559,7 @@ static inline void syn_ack_recalc(struct request_sock *req, const int thresh,
 
 int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req)
 {
-	int err = req->rsk_ops->rtx_syn_ack(parent, req, NULL);
+	int err = req->rsk_ops->rtx_syn_ack(parent, req);
 
 	if (!err)
 		req->num_retrans++;
@@ -714,6 +735,7 @@ EXPORT_SYMBOL(inet_csk_destroy_sock);
  * tcp/dccp_create_openreq_child().
  */
 void inet_csk_prepare_forced_close(struct sock *sk)
+	__releases(&sk->sk_lock.slock)
 {
 	/* sk_clone_lock locked the socket and set refcnt to 2 */
 	bh_unlock_sock(sk);
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 7afa2c3..5f64875 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -158,7 +158,9 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 
 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
 
-	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
+	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 		r->idiag_timer = 1;
 		r->idiag_retrans = icsk->icsk_retransmits;
 		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
@@ -322,7 +324,7 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_s
 	}
 
 	err = sk_diag_fill(sk, rep, req,
-			   sk_user_ns(NETLINK_CB(in_skb).ssk),
+			   sk_user_ns(NETLINK_CB(in_skb).sk),
 			   NETLINK_CB(in_skb).portid,
 			   nlh->nlmsg_seq, 0, nlh);
 	if (err < 0) {
@@ -628,7 +630,7 @@ static int inet_csk_diag_dump(struct sock *sk,
 		return 0;
 
 	return inet_csk_diag_fill(sk, skb, r,
-				  sk_user_ns(NETLINK_CB(cb->skb).ssk),
+				  sk_user_ns(NETLINK_CB(cb->skb).sk),
 				  NETLINK_CB(cb->skb).portid,
 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 }
@@ -803,7 +805,7 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 			}
 
 			err = inet_diag_fill_req(skb, sk, req,
-					       sk_user_ns(NETLINK_CB(cb->skb).ssk),
+					       sk_user_ns(NETLINK_CB(cb->skb).sk),
 					       NETLINK_CB(cb->skb).portid,
 					       cb->nlh->nlmsg_seq, cb->nlh);
 			if (err < 0) {
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index 4750d2b..7e06641 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -21,7 +21,30 @@
 #include <linux/rtnetlink.h>
 #include <linux/slab.h>
 
+#include <net/sock.h>
 #include <net/inet_frag.h>
+#include <net/inet_ecn.h>
+
+/* Given the OR values of all fragments, apply RFC 3168 5.3 requirements
+ * Value : 0xff if frame should be dropped.
+ *         0 or INET_ECN_CE value, to be ORed in to final iph->tos field
+ */
+const u8 ip_frag_ecn_table[16] = {
+	/* at least one fragment had CE, and others ECT_0 or ECT_1 */
+	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0]			= INET_ECN_CE,
+	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1]			= INET_ECN_CE,
+	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1]	= INET_ECN_CE,
+
+	/* invalid combinations : drop frame */
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_1] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1] = 0xff,
+	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
+};
+EXPORT_SYMBOL(ip_frag_ecn_table);
 
 static void inet_frag_secret_rebuild(unsigned long dummy)
 {
@@ -29,20 +52,27 @@ static void inet_frag_secret_rebuild(unsigned long dummy)
 	unsigned long now = jiffies;
 	int i;
 
+	/* Per bucket lock NOT needed here, due to write lock protection */
 	write_lock(&f->lock);
+
 	get_random_bytes(&f->rnd, sizeof(u32));
 	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
+		struct inet_frag_bucket *hb;
 		struct inet_frag_queue *q;
-		struct hlist_node *p, *n;
+		struct hlist_node *n;
 
-		hlist_for_each_entry_safe(q, p, n, &f->hash[i], list) {
+		hb = &f->hash[i];
+		hlist_for_each_entry_safe(q, n, &hb->chain, list) {
 			unsigned int hval = f->hashfn(q);
 
 			if (hval != i) {
+				struct inet_frag_bucket *hb_dest;
+
 				hlist_del(&q->list);
 
 				/* Relink to new hash chain. */
-				hlist_add_head(&q->list, &f->hash[hval]);
+				hb_dest = &f->hash[hval];
+				hlist_add_head(&q->list, &hb_dest->chain);
 			}
 		}
 	}
@@ -55,9 +85,12 @@ void inet_frags_init(struct inet_frags *f)
 {
 	int i;
 
-	for (i = 0; i < INETFRAGS_HASHSZ; i++)
-		INIT_HLIST_HEAD(&f->hash[i]);
+	for (i = 0; i < INETFRAGS_HASHSZ; i++) {
+		struct inet_frag_bucket *hb = &f->hash[i];
 
+		spin_lock_init(&hb->chain_lock);
+		INIT_HLIST_HEAD(&hb->chain);
+	}
 	rwlock_init(&f->lock);
 
 	f->rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
@@ -73,8 +106,9 @@ EXPORT_SYMBOL(inet_frags_init);
 void inet_frags_init_net(struct netns_frags *nf)
 {
 	nf->nqueues = 0;
-	atomic_set(&nf->mem, 0);
+	init_frag_mem_limit(nf);
 	INIT_LIST_HEAD(&nf->lru_list);
+	spin_lock_init(&nf->lru_lock);
 }
 EXPORT_SYMBOL(inet_frags_init_net);
 
@@ -91,16 +125,26 @@ void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f)
 	local_bh_disable();
 	inet_frag_evictor(nf, f, true);
 	local_bh_enable();
+
+	percpu_counter_destroy(&nf->mem);
 }
 EXPORT_SYMBOL(inet_frags_exit_net);
 
 static inline void fq_unlink(struct inet_frag_queue *fq, struct inet_frags *f)
 {
-	write_lock(&f->lock);
+	struct inet_frag_bucket *hb;
+	unsigned int hash;
+
+	read_lock(&f->lock);
+	hash = f->hashfn(fq);
+	hb = &f->hash[hash];
+
+	spin_lock(&hb->chain_lock);
 	hlist_del(&fq->list);
-	list_del(&fq->lru_list);
-	fq->net->nqueues--;
-	write_unlock(&f->lock);
+	spin_unlock(&hb->chain_lock);
+
+	read_unlock(&f->lock);
+	inet_frag_lru_del(fq);
 }
 
 void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
@@ -117,12 +161,8 @@ void inet_frag_kill(struct inet_frag_queue *fq, struct inet_frags *f)
 EXPORT_SYMBOL(inet_frag_kill);
 
 static inline void frag_kfree_skb(struct netns_frags *nf, struct inet_frags *f,
-		struct sk_buff *skb, int *work)
+		struct sk_buff *skb)
 {
-	if (work)
-		*work -= skb->truesize;
-
-	atomic_sub(skb->truesize, &nf->mem);
 	if (f->skb_free)
 		f->skb_free(skb);
 	kfree_skb(skb);
@@ -133,6 +173,7 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
 {
 	struct sk_buff *fp;
 	struct netns_frags *nf;
+	unsigned int sum, sum_truesize = 0;
 
 	WARN_ON(!(q->last_in & INET_FRAG_COMPLETE));
 	WARN_ON(del_timer(&q->timer) != 0);
@@ -143,13 +184,14 @@ void inet_frag_destroy(struct inet_frag_queue *q, struct inet_frags *f,
 	while (fp) {
 		struct sk_buff *xp = fp->next;
 
-		frag_kfree_skb(nf, f, fp, work);
+		sum_truesize += fp->truesize;
+		frag_kfree_skb(nf, f, fp);
 		fp = xp;
 	}
-
+	sum = sum_truesize + f->qsize;
 	if (work)
-		*work -= f->qsize;
-	atomic_sub(f->qsize, &nf->mem);
+		*work -= sum;
+	sub_frag_mem_limit(q, sum);
 
 	if (f->destructor)
 		f->destructor(q);
@@ -164,22 +206,26 @@ int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force)
 	int work, evicted = 0;
 
 	if (!force) {
-		if (atomic_read(&nf->mem) <= nf->high_thresh)
+		if (frag_mem_limit(nf) <= nf->high_thresh)
 			return 0;
 	}
 
-	work = atomic_read(&nf->mem) - nf->low_thresh;
+	work = frag_mem_limit(nf) - nf->low_thresh;
 	while (work > 0) {
-		read_lock(&f->lock);
+		spin_lock(&nf->lru_lock);
+
 		if (list_empty(&nf->lru_list)) {
-			read_unlock(&f->lock);
+			spin_unlock(&nf->lru_lock);
 			break;
 		}
 
 		q = list_first_entry(&nf->lru_list,
 				struct inet_frag_queue, lru_list);
 		atomic_inc(&q->refcnt);
-		read_unlock(&f->lock);
+		/* Remove q from list to avoid several CPUs grabbing it */
+		list_del_init(&q->lru_list);
+
+		spin_unlock(&nf->lru_lock);
 
 		spin_lock(&q->lock);
 		if (!(q->last_in & INET_FRAG_COMPLETE))
@@ -199,28 +245,32 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
 		struct inet_frag_queue *qp_in, struct inet_frags *f,
 		void *arg)
 {
+	struct inet_frag_bucket *hb;
 	struct inet_frag_queue *qp;
 #ifdef CONFIG_SMP
-	struct hlist_node *n;
 #endif
 	unsigned int hash;
 
-	write_lock(&f->lock);
+	read_lock(&f->lock); /* Protects against hash rebuild */
 	/*
 	 * While we stayed w/o the lock other CPU could update
 	 * the rnd seed, so we need to re-calculate the hash
 	 * chain. Fortunatelly the qp_in can be used to get one.
 	 */
 	hash = f->hashfn(qp_in);
+	hb = &f->hash[hash];
+	spin_lock(&hb->chain_lock);
+
 #ifdef CONFIG_SMP
 	/* With SMP race we have to recheck hash table, because
 	 * such entry could be created on other cpu, while we
-	 * promoted read lock to write lock.
+	 * released the hash bucket lock.
 	 */
-	hlist_for_each_entry(qp, n, &f->hash[hash], list) {
+	hlist_for_each_entry(qp, &hb->chain, list) {
 		if (qp->net == nf && f->match(qp, arg)) {
 			atomic_inc(&qp->refcnt);
-			write_unlock(&f->lock);
+			spin_unlock(&hb->chain_lock);
+			read_unlock(&f->lock);
 			qp_in->last_in |= INET_FRAG_COMPLETE;
 			inet_frag_put(qp_in, f);
 			return qp;
@@ -232,10 +282,10 @@ static struct inet_frag_queue *inet_frag_intern(struct netns_frags *nf,
 		atomic_inc(&qp->refcnt);
 
 	atomic_inc(&qp->refcnt);
-	hlist_add_head(&qp->list, &f->hash[hash]);
-	list_add_tail(&qp->lru_list, &nf->lru_list);
-	nf->nqueues++;
-	write_unlock(&f->lock);
+	hlist_add_head(&qp->list, &hb->chain);
+	spin_unlock(&hb->chain_lock);
+	read_unlock(&f->lock);
+	inet_frag_lru_add(nf, qp);
 	return qp;
 }
 
@@ -250,10 +300,12 @@ static struct inet_frag_queue *inet_frag_alloc(struct netns_frags *nf,
 
 	q->net = nf;
 	f->constructor(q, arg);
-	atomic_add(f->qsize, &nf->mem);
+	add_frag_mem_limit(q, f->qsize);
+
 	setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
 	spin_lock_init(&q->lock);
 	atomic_set(&q->refcnt, 1);
+	INIT_LIST_HEAD(&q->lru_list);
 
 	return q;
 }
@@ -274,18 +326,40 @@ struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
 		struct inet_frags *f, void *key, unsigned int hash)
 	__releases(&f->lock)
 {
+	struct inet_frag_bucket *hb;
 	struct inet_frag_queue *q;
-	struct hlist_node *n;
+	int depth = 0;
 
-	hlist_for_each_entry(q, n, &f->hash[hash], list) {
+	hb = &f->hash[hash];
+
+	spin_lock(&hb->chain_lock);
+	hlist_for_each_entry(q, &hb->chain, list) {
 		if (q->net == nf && f->match(q, key)) {
 			atomic_inc(&q->refcnt);
+			spin_unlock(&hb->chain_lock);
 			read_unlock(&f->lock);
 			return q;
 		}
+		depth++;
 	}
+	spin_unlock(&hb->chain_lock);
 	read_unlock(&f->lock);
 
-	return inet_frag_create(nf, f, key);
+	if (depth <= INETFRAGS_MAXDEPTH)
+		return inet_frag_create(nf, f, key);
+	else
+		return ERR_PTR(-ENOBUFS);
 }
 EXPORT_SYMBOL(inet_frag_find);
+
+void inet_frag_maybe_warn_overflow(struct inet_frag_queue *q,
+				   const char *prefix)
+{
+	static const char msg[] = "inet_frag_find: Fragment hash bucket"
+		" list length grew over limit " __stringify(INETFRAGS_MAXDEPTH)
+		". Dropping fragment.\n";
+
+	if (PTR_ERR(q) == -ENOBUFS)
+		LIMIT_NETDEBUG(KERN_WARNING "%s%s", prefix, msg);
+}
+EXPORT_SYMBOL(inet_frag_maybe_warn_overflow);
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index fa3ae81..6af375a 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -39,6 +39,7 @@ struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 		write_pnet(&tb->ib_net, hold_net(net));
 		tb->port      = snum;
 		tb->fastreuse = 0;
+		tb->fastreuseport = 0;
 		tb->num_owners = 0;
 		INIT_HLIST_HEAD(&tb->owners);
 		hlist_add_head(&tb->node, &head->chain);
@@ -119,13 +120,12 @@ int __inet_inherit_port(struct sock *sk, struct sock *child)
 		 * that the listener socket's icsk_bind_hash is the same
 		 * as that of the child socket. We have to look up or
 		 * create a new bind bucket for the child here. */
-		struct hlist_node *node;
-		inet_bind_bucket_for_each(tb, node, &head->chain) {
+		inet_bind_bucket_for_each(tb, &head->chain) {
 			if (net_eq(ib_net(tb), sock_net(sk)) &&
 			    tb->port == port)
 				break;
 		}
-		if (!node) {
+		if (!tb) {
 			tb = inet_bind_bucket_create(table->bind_bucket_cachep,
 						     sock_net(sk), head, port);
 			if (!tb) {
@@ -151,16 +151,16 @@ static inline int compute_score(struct sock *sk, struct net *net,
 	if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
 			!ipv6_only_sock(sk)) {
 		__be32 rcv_saddr = inet->inet_rcv_saddr;
-		score = sk->sk_family == PF_INET ? 1 : 0;
+		score = sk->sk_family == PF_INET ? 2 : 1;
 		if (rcv_saddr) {
 			if (rcv_saddr != daddr)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (sk->sk_bound_dev_if) {
 			if (sk->sk_bound_dev_if != dif)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 	}
 	return score;
@@ -176,6 +176,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
 
 struct sock *__inet_lookup_listener(struct net *net,
 				    struct inet_hashinfo *hashinfo,
+				    const __be32 saddr, __be16 sport,
 				    const __be32 daddr, const unsigned short hnum,
 				    const int dif)
 {
@@ -183,17 +184,29 @@ struct sock *__inet_lookup_listener(struct net *net,
 	struct hlist_nulls_node *node;
 	unsigned int hash = inet_lhashfn(net, hnum);
 	struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
-	int score, hiscore;
+	int score, hiscore, matches = 0, reuseport = 0;
+	u32 phash = 0;
 
 	rcu_read_lock();
 begin:
 	result = NULL;
-	hiscore = -1;
+	hiscore = 0;
 	sk_nulls_for_each_rcu(sk, node, &ilb->head) {
 		score = compute_score(sk, net, hnum, daddr, dif);
 		if (score > hiscore) {
 			result = sk;
 			hiscore = score;
+			reuseport = sk->sk_reuseport;
+			if (reuseport) {
+				phash = inet_ehashfn(net, daddr, hnum,
+						     saddr, sport);
+				matches = 1;
+			}
+		} else if (score == hiscore && reuseport) {
+			matches++;
+			if (((u64)phash * matches) >> 32 == 0)
+				result = sk;
+			phash = next_pseudo_random32(phash);
 		}
 	}
 	/*
@@ -479,7 +492,6 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 		int i, remaining, low, high, port;
 		static u32 hint;
 		u32 offset = hint + port_offset;
-		struct hlist_node *node;
 		struct inet_timewait_sock *tw = NULL;
 
 		inet_get_local_port_range(&low, &high);
@@ -498,10 +510,11 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 			 * because the established check is already
 			 * unique enough.
 			 */
-			inet_bind_bucket_for_each(tb, node, &head->chain) {
+			inet_bind_bucket_for_each(tb, &head->chain) {
 				if (net_eq(ib_net(tb), net) &&
 				    tb->port == port) {
-					if (tb->fastreuse >= 0)
+					if (tb->fastreuse >= 0 ||
+					    tb->fastreuseport >= 0)
 						goto next_port;
 					WARN_ON(hlist_empty(&tb->owners));
 					if (!check_established(death_row, sk,
@@ -518,6 +531,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 				break;
 			}
 			tb->fastreuse = -1;
+			tb->fastreuseport = -1;
 			goto ok;
 
 		next_port:
diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c
index cc280a3..1975f52 100644
--- a/net/ipv4/inet_lro.c
+++ b/net/ipv4/inet_lro.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/if_vlan.h>
 #include <linux/inet_lro.h>
+#include <net/checksum.h>
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Jan-Bernd Themann <themann@de.ibm.com>");
@@ -114,11 +115,9 @@ static void lro_update_tcp_ip_header(struct net_lro_desc *lro_desc)
 		*(p+2) = lro_desc->tcp_rcv_tsecr;
 	}
 
+	csum_replace2(&iph->check, iph->tot_len, htons(lro_desc->ip_tot_len));
 	iph->tot_len = htons(lro_desc->ip_tot_len);
 
-	iph->check = 0;
-	iph->check = ip_fast_csum((u8 *)lro_desc->iph, iph->ihl);
-
 	tcph->check = 0;
 	tcp_hdr_csum = csum_partial(tcph, TCP_HDR_LEN(tcph), 0);
 	lro_desc->data_csum = csum_add(lro_desc->data_csum, tcp_hdr_csum);
diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 2784db3..1f27c9f 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -216,7 +216,6 @@ static int inet_twdr_do_twkill_work(struct inet_timewait_death_row *twdr,
 				    const int slot)
 {
 	struct inet_timewait_sock *tw;
-	struct hlist_node *node;
 	unsigned int killed;
 	int ret;
 
@@ -229,7 +228,7 @@ static int inet_twdr_do_twkill_work(struct inet_timewait_death_row *twdr,
 	killed = 0;
 	ret = 0;
 rescan:
-	inet_twsk_for_each_inmate(tw, node, &twdr->cells[slot]) {
+	inet_twsk_for_each_inmate(tw, &twdr->cells[slot]) {
 		__inet_twsk_del_dead_node(tw);
 		spin_unlock(&twdr->death_lock);
 		__inet_twsk_kill(tw, twdr->hashinfo);
@@ -438,10 +437,10 @@ void inet_twdr_twcal_tick(unsigned long data)
 
 	for (n = 0; n < INET_TWDR_RECYCLE_SLOTS; n++) {
 		if (time_before_eq(j, now)) {
-			struct hlist_node *node, *safe;
+			struct hlist_node *safe;
 			struct inet_timewait_sock *tw;
 
-			inet_twsk_for_each_inmate_safe(tw, node, safe,
+			inet_twsk_for_each_inmate_safe(tw, safe,
 						       &twdr->twcal_row[slot]) {
 				__inet_twsk_del_dead_node(tw);
 				__inet_twsk_kill(tw, twdr->hashinfo);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index eb9d63a..b66910a 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -79,40 +79,11 @@ struct ipq {
 	struct inet_peer *peer;
 };
 
-/* RFC 3168 support :
- * We want to check ECN values of all fragments, do detect invalid combinations.
- * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value.
- */
-#define	IPFRAG_ECN_NOT_ECT	0x01 /* one frag had ECN_NOT_ECT */
-#define	IPFRAG_ECN_ECT_1	0x02 /* one frag had ECN_ECT_1 */
-#define	IPFRAG_ECN_ECT_0	0x04 /* one frag had ECN_ECT_0 */
-#define	IPFRAG_ECN_CE		0x08 /* one frag had ECN_CE */
-
 static inline u8 ip4_frag_ecn(u8 tos)
 {
 	return 1 << (tos & INET_ECN_MASK);
 }
 
-/* Given the OR values of all fragments, apply RFC 3168 5.3 requirements
- * Value : 0xff if frame should be dropped.
- *         0 or INET_ECN_CE value, to be ORed in to final iph->tos field
- */
-static const u8 ip4_frag_ecn_table[16] = {
-	/* at least one fragment had CE, and others ECT_0 or ECT_1 */
-	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0]			= INET_ECN_CE,
-	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1]			= INET_ECN_CE,
-	[IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1]	= INET_ECN_CE,
-
-	/* invalid combinations : drop frame */
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_1] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_1] = 0xff,
-	[IPFRAG_ECN_NOT_ECT | IPFRAG_ECN_CE | IPFRAG_ECN_ECT_0 | IPFRAG_ECN_ECT_1] = 0xff,
-};
-
 static struct inet_frags ip4_frags;
 
 int ip_frag_nqueues(struct net *net)
@@ -122,7 +93,7 @@ int ip_frag_nqueues(struct net *net)
 
 int ip_frag_mem(struct net *net)
 {
-	return atomic_read(&net->ipv4.frags.mem);
+	return sum_frag_mem_limit(&net->ipv4.frags);
 }
 
 static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
@@ -161,13 +132,6 @@ static bool ip4_frag_match(struct inet_frag_queue *q, void *a)
 		qp->user == arg->user;
 }
 
-/* Memory Tracking Functions. */
-static void frag_kfree_skb(struct netns_frags *nf, struct sk_buff *skb)
-{
-	atomic_sub(skb->truesize, &nf->mem);
-	kfree_skb(skb);
-}
-
 static void ip4_frag_init(struct inet_frag_queue *q, void *a)
 {
 	struct ipq *qp = container_of(q, struct ipq, q);
@@ -255,8 +219,7 @@ static void ip_expire(unsigned long arg)
 		if (!head->dev)
 			goto out_rcu_unlock;
 
-		/* skb dst is stale, drop it, and perform route lookup again */
-		skb_dst_drop(head);
+		/* skb has no dst, perform route lookup again */
 		iph = ip_hdr(head);
 		err = ip_route_input_noref(head, iph->daddr, iph->saddr,
 					   iph->tos, head->dev);
@@ -299,14 +262,11 @@ static inline struct ipq *ip_find(struct net *net, struct iphdr *iph, u32 user)
 	hash = ipqhashfn(iph->id, iph->saddr, iph->daddr, iph->protocol);
 
 	q = inet_frag_find(&net->ipv4.frags, &ip4_frags, &arg, hash);
-	if (q == NULL)
-		goto out_nomem;
-
+	if (IS_ERR_OR_NULL(q)) {
+		inet_frag_maybe_warn_overflow(q, pr_fmt());
+		return NULL;
+	}
 	return container_of(q, struct ipq, q);
-
-out_nomem:
-	LIMIT_NETDEBUG(KERN_ERR pr_fmt("ip_frag_create: no memory left !\n"));
-	return NULL;
 }
 
 /* Is the fragment too far ahead to be part of ipq? */
@@ -340,6 +300,7 @@ static inline int ip_frag_too_far(struct ipq *qp)
 static int ip_frag_reinit(struct ipq *qp)
 {
 	struct sk_buff *fp;
+	unsigned int sum_truesize = 0;
 
 	if (!mod_timer(&qp->q.timer, jiffies + qp->q.net->timeout)) {
 		atomic_inc(&qp->q.refcnt);
@@ -349,9 +310,12 @@ static int ip_frag_reinit(struct ipq *qp)
 	fp = qp->q.fragments;
 	do {
 		struct sk_buff *xp = fp->next;
-		frag_kfree_skb(qp->q.net, fp);
+
+		sum_truesize += fp->truesize;
+		kfree_skb(fp);
 		fp = xp;
 	} while (fp);
+	sub_frag_mem_limit(&qp->q, sum_truesize);
 
 	qp->q.last_in = 0;
 	qp->q.len = 0;
@@ -496,7 +460,8 @@ found:
 				qp->q.fragments = next;
 
 			qp->q.meat -= free_it->len;
-			frag_kfree_skb(qp->q.net, free_it);
+			sub_frag_mem_limit(&qp->q, free_it->truesize);
+			kfree_skb(free_it);
 		}
 	}
 
@@ -519,7 +484,7 @@ found:
 	qp->q.stamp = skb->tstamp;
 	qp->q.meat += skb->len;
 	qp->ecn |= ecn;
-	atomic_add(skb->truesize, &qp->q.net->mem);
+	add_frag_mem_limit(&qp->q, skb->truesize);
 	if (offset == 0)
 		qp->q.last_in |= INET_FRAG_FIRST_IN;
 
@@ -528,12 +493,17 @@ found:
 		qp->q.max_size = skb->len + ihl;
 
 	if (qp->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
-	    qp->q.meat == qp->q.len)
-		return ip_frag_reasm(qp, prev, dev);
+	    qp->q.meat == qp->q.len) {
+		unsigned long orefdst = skb->_skb_refdst;
+
+		skb->_skb_refdst = 0UL;
+		err = ip_frag_reasm(qp, prev, dev);
+		skb->_skb_refdst = orefdst;
+		return err;
+	}
 
-	write_lock(&ip4_frags.lock);
-	list_move_tail(&qp->q.lru_list, &qp->q.net->lru_list);
-	write_unlock(&ip4_frags.lock);
+	skb_dst_drop(skb);
+	inet_frag_lru_move(&qp->q);
 	return -EINPROGRESS;
 
 err:
@@ -558,7 +528,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 
 	ipq_kill(qp);
 
-	ecn = ip4_frag_ecn_table[qp->ecn];
+	ecn = ip_frag_ecn_table[qp->ecn];
 	if (unlikely(ecn == 0xff)) {
 		err = -EINVAL;
 		goto out_fail;
@@ -594,7 +564,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		goto out_oversize;
 
 	/* Head of list must not be cloned. */
-	if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
+	if (skb_unclone(head, GFP_ATOMIC))
 		goto out_nomem;
 
 	/* If the first fragment is fragmented itself, we split
@@ -617,7 +587,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		head->len -= clone->len;
 		clone->csum = 0;
 		clone->ip_summed = head->ip_summed;
-		atomic_add(clone->truesize, &qp->q.net->mem);
+		add_frag_mem_limit(&qp->q, clone->truesize);
 	}
 
 	skb_push(head, head->data - skb_network_header(head));
@@ -645,7 +615,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 		}
 		fp = next;
 	}
-	atomic_sub(sum_truesize, &qp->q.net->mem);
+	sub_frag_mem_limit(&qp->q, sum_truesize);
 
 	head->next = NULL;
 	head->dev = dev;
@@ -851,14 +821,22 @@ static inline void ip4_frags_ctl_register(void)
 
 static int __net_init ipv4_frags_init_net(struct net *net)
 {
-	/*
-	 * Fragment cache limits. We will commit 256K at one time. Should we
-	 * cross that limit we will prune down to 192K. This should cope with
-	 * even the most extreme cases without allowing an attacker to
-	 * measurably harm machine performance.
+	/* Fragment cache limits.
+	 *
+	 * The fragment memory accounting code, (tries to) account for
+	 * the real memory usage, by measuring both the size of frag
+	 * queue struct (inet_frag_queue (ipv4:ipq/ipv6:frag_queue))
+	 * and the SKB's truesize.
+	 *
+	 * A 64K fragment consumes 129736 bytes (44*2944)+200
+	 * (1500 truesize == 2944, sizeof(struct ipq) == 200)
+	 *
+	 * We will commit 4MB at one time. Should we cross that limit
+	 * we will prune down to 3MB, making room for approx 8 big 64K
+	 * fragments 8x128k.
 	 */
-	net->ipv4.frags.high_thresh = 256 * 1024;
-	net->ipv4.frags.low_thresh = 192 * 1024;
+	net->ipv4.frags.high_thresh = 4 * 1024 * 1024;
+	net->ipv4.frags.low_thresh  = 3 * 1024 * 1024;
 	/*
 	 * Important NOTE! Fragment queue must be destroyed before MSL expires.
 	 * RFC791 is wrong proposing to prolongate timer each fragment arrival
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index e81b1ca..2a83591 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -37,7 +37,7 @@
 #include <net/ip.h>
 #include <net/icmp.h>
 #include <net/protocol.h>
-#include <net/ipip.h>
+#include <net/ip_tunnels.h>
 #include <net/arp.h>
 #include <net/checksum.h>
 #include <net/dsfield.h>
@@ -108,15 +108,6 @@
    fatal route to network, even if it were you who configured
    fatal static route: you are innocent. :-)
 
-
-
-   3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain
-   practically identical code. It would be good to glue them
-   together, but it is not very evident, how to make them modular.
-   sit is integral part of IPv6, ipip and gre are naturally modular.
-   We could extract common parts (hash table, ioctl etc)
-   to a separate module (ip_tunnel.c).
-
    Alexey Kuznetsov.
  */
 
@@ -126,400 +117,137 @@ MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 
 static struct rtnl_link_ops ipgre_link_ops __read_mostly;
 static int ipgre_tunnel_init(struct net_device *dev);
-static void ipgre_tunnel_setup(struct net_device *dev);
-static int ipgre_tunnel_bind_dev(struct net_device *dev);
-
-/* Fallback tunnel: no source, no destination, no key, no options */
-
-#define HASH_SIZE  16
 
 static int ipgre_net_id __read_mostly;
-struct ipgre_net {
-	struct ip_tunnel __rcu *tunnels[4][HASH_SIZE];
-
-	struct net_device *fb_tunnel_dev;
-};
-
-/* Tunnel hash table */
-
-/*
-   4 hash tables:
-
-   3: (remote,local)
-   2: (remote,*)
-   1: (*,local)
-   0: (*,*)
+static int gre_tap_net_id __read_mostly;
 
-   We require exact key match i.e. if a key is present in packet
-   it will match only tunnel with the same key; if it is not present,
-   it will match only keyless tunnel.
-
-   All keysless packets, if not matched configured keyless tunnels
-   will match fallback tunnel.
- */
+static __sum16 check_checksum(struct sk_buff *skb)
+{
+	__sum16 csum = 0;
 
-#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
+	switch (skb->ip_summed) {
+	case CHECKSUM_COMPLETE:
+		csum = csum_fold(skb->csum);
 
-#define tunnels_r_l	tunnels[3]
-#define tunnels_r	tunnels[2]
-#define tunnels_l	tunnels[1]
-#define tunnels_wc	tunnels[0]
+		if (!csum)
+			break;
+		/* Fall through. */
 
-static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev,
-						   struct rtnl_link_stats64 *tot)
-{
-	int i;
-
-	for_each_possible_cpu(i) {
-		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
-
-		do {
-			start = u64_stats_fetch_begin_bh(&tstats->syncp);
-			rx_packets = tstats->rx_packets;
-			tx_packets = tstats->tx_packets;
-			rx_bytes = tstats->rx_bytes;
-			tx_bytes = tstats->tx_bytes;
-		} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
-
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
+	case CHECKSUM_NONE:
+		skb->csum = 0;
+		csum = __skb_checksum_complete(skb);
+		skb->ip_summed = CHECKSUM_COMPLETE;
+		break;
 	}
 
-	tot->multicast = dev->stats.multicast;
-	tot->rx_crc_errors = dev->stats.rx_crc_errors;
-	tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
-	tot->rx_length_errors = dev->stats.rx_length_errors;
-	tot->rx_frame_errors = dev->stats.rx_frame_errors;
-	tot->rx_errors = dev->stats.rx_errors;
-
-	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
-	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
-	tot->tx_dropped = dev->stats.tx_dropped;
-	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
-	tot->tx_errors = dev->stats.tx_errors;
-
-	return tot;
+	return csum;
 }
 
-/* Does key in tunnel parameters match packet */
-static bool ipgre_key_match(const struct ip_tunnel_parm *p,
-			    __be16 flags, __be32 key)
+static int ip_gre_calc_hlen(__be16 o_flags)
 {
-	if (p->i_flags & GRE_KEY) {
-		if (flags & GRE_KEY)
-			return key == p->i_key;
-		else
-			return false;	/* key expected, none present */
-	} else
-		return !(flags & GRE_KEY);
+	int addend = 4;
+
+	if (o_flags&TUNNEL_CSUM)
+		addend += 4;
+	if (o_flags&TUNNEL_KEY)
+		addend += 4;
+	if (o_flags&TUNNEL_SEQ)
+		addend += 4;
+	return addend;
 }
 
-/* Given src, dst and key, find appropriate for input tunnel. */
-
-static struct ip_tunnel *ipgre_tunnel_lookup(struct net_device *dev,
-					     __be32 remote, __be32 local,
-					     __be16 flags, __be32 key,
-					     __be16 gre_proto)
+static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
+			    bool *csum_err, int *hdr_len)
 {
-	struct net *net = dev_net(dev);
-	int link = dev->ifindex;
-	unsigned int h0 = HASH(remote);
-	unsigned int h1 = HASH(key);
-	struct ip_tunnel *t, *cand = NULL;
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-	int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
-		       ARPHRD_ETHER : ARPHRD_IPGRE;
-	int score, cand_score = 4;
-
-	for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
-		if (local != t->parms.iph.saddr ||
-		    remote != t->parms.iph.daddr ||
-		    !(t->dev->flags & IFF_UP))
-			continue;
-
-		if (!ipgre_key_match(&t->parms, flags, key))
-			continue;
-
-		if (t->dev->type != ARPHRD_IPGRE &&
-		    t->dev->type != dev_type)
-			continue;
-
-		score = 0;
-		if (t->parms.link != link)
-			score |= 1;
-		if (t->dev->type != dev_type)
-			score |= 2;
-		if (score == 0)
-			return t;
-
-		if (score < cand_score) {
-			cand = t;
-			cand_score = score;
-		}
-	}
+	unsigned int ip_hlen = ip_hdrlen(skb);
+	const struct gre_base_hdr *greh;
+	__be32 *options;
 
-	for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
-		if (remote != t->parms.iph.daddr ||
-		    !(t->dev->flags & IFF_UP))
-			continue;
-
-		if (!ipgre_key_match(&t->parms, flags, key))
-			continue;
-
-		if (t->dev->type != ARPHRD_IPGRE &&
-		    t->dev->type != dev_type)
-			continue;
-
-		score = 0;
-		if (t->parms.link != link)
-			score |= 1;
-		if (t->dev->type != dev_type)
-			score |= 2;
-		if (score == 0)
-			return t;
-
-		if (score < cand_score) {
-			cand = t;
-			cand_score = score;
-		}
-	}
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr))))
+		return -EINVAL;
 
-	for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
-		if ((local != t->parms.iph.saddr &&
-		     (local != t->parms.iph.daddr ||
-		      !ipv4_is_multicast(local))) ||
-		    !(t->dev->flags & IFF_UP))
-			continue;
-
-		if (!ipgre_key_match(&t->parms, flags, key))
-			continue;
-
-		if (t->dev->type != ARPHRD_IPGRE &&
-		    t->dev->type != dev_type)
-			continue;
-
-		score = 0;
-		if (t->parms.link != link)
-			score |= 1;
-		if (t->dev->type != dev_type)
-			score |= 2;
-		if (score == 0)
-			return t;
-
-		if (score < cand_score) {
-			cand = t;
-			cand_score = score;
-		}
-	}
+	greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen);
+	if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
+		return -EINVAL;
 
-	for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
-		if (t->parms.i_key != key ||
-		    !(t->dev->flags & IFF_UP))
-			continue;
-
-		if (t->dev->type != ARPHRD_IPGRE &&
-		    t->dev->type != dev_type)
-			continue;
-
-		score = 0;
-		if (t->parms.link != link)
-			score |= 1;
-		if (t->dev->type != dev_type)
-			score |= 2;
-		if (score == 0)
-			return t;
-
-		if (score < cand_score) {
-			cand = t;
-			cand_score = score;
-		}
-	}
+	tpi->flags = gre_flags_to_tnl_flags(greh->flags);
+	*hdr_len = ip_gre_calc_hlen(tpi->flags);
 
-	if (cand != NULL)
-		return cand;
+	if (!pskb_may_pull(skb, *hdr_len))
+		return -EINVAL;
 
-	dev = ign->fb_tunnel_dev;
-	if (dev->flags & IFF_UP)
-		return netdev_priv(dev);
+	greh = (struct gre_base_hdr *)(skb_network_header(skb) + ip_hlen);
 
-	return NULL;
-}
+	tpi->proto = greh->protocol;
 
-static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign,
-		struct ip_tunnel_parm *parms)
-{
-	__be32 remote = parms->iph.daddr;
-	__be32 local = parms->iph.saddr;
-	__be32 key = parms->i_key;
-	unsigned int h = HASH(key);
-	int prio = 0;
-
-	if (local)
-		prio |= 1;
-	if (remote && !ipv4_is_multicast(remote)) {
-		prio |= 2;
-		h ^= HASH(remote);
+	options = (__be32 *)(greh + 1);
+	if (greh->flags & GRE_CSUM) {
+		if (check_checksum(skb)) {
+			*csum_err = true;
+			return -EINVAL;
+		}
+		options++;
 	}
 
-	return &ign->tunnels[prio][h];
-}
-
-static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign,
-		struct ip_tunnel *t)
-{
-	return __ipgre_bucket(ign, &t->parms);
-}
-
-static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t)
-{
-	struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t);
+	if (greh->flags & GRE_KEY) {
+		tpi->key = *options;
+		options++;
+	} else
+		tpi->key = 0;
 
-	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
-	rcu_assign_pointer(*tp, t);
-}
+	if (unlikely(greh->flags & GRE_SEQ)) {
+		tpi->seq = *options;
+		options++;
+	} else
+		tpi->seq = 0;
 
-static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t)
-{
-	struct ip_tunnel __rcu **tp;
-	struct ip_tunnel *iter;
-
-	for (tp = ipgre_bucket(ign, t);
-	     (iter = rtnl_dereference(*tp)) != NULL;
-	     tp = &iter->next) {
-		if (t == iter) {
-			rcu_assign_pointer(*tp, t->next);
-			break;
+	/* WCCP version 1 and 2 protocol decoding.
+	 * - Change protocol to IP
+	 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
+	 */
+	if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
+		tpi->proto = htons(ETH_P_IP);
+		if ((*(u8 *)options & 0xF0) != 0x40) {
+			*hdr_len += 4;
+			if (!pskb_may_pull(skb, *hdr_len))
+				return -EINVAL;
 		}
 	}
-}
-
-static struct ip_tunnel *ipgre_tunnel_find(struct net *net,
-					   struct ip_tunnel_parm *parms,
-					   int type)
-{
-	__be32 remote = parms->iph.daddr;
-	__be32 local = parms->iph.saddr;
-	__be32 key = parms->i_key;
-	int link = parms->link;
-	struct ip_tunnel *t;
-	struct ip_tunnel __rcu **tp;
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
-	for (tp = __ipgre_bucket(ign, parms);
-	     (t = rtnl_dereference(*tp)) != NULL;
-	     tp = &t->next)
-		if (local == t->parms.iph.saddr &&
-		    remote == t->parms.iph.daddr &&
-		    key == t->parms.i_key &&
-		    link == t->parms.link &&
-		    type == t->dev->type)
-			break;
-
-	return t;
-}
-
-static struct ip_tunnel *ipgre_tunnel_locate(struct net *net,
-		struct ip_tunnel_parm *parms, int create)
-{
-	struct ip_tunnel *t, *nt;
-	struct net_device *dev;
-	char name[IFNAMSIZ];
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
-	t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE);
-	if (t || !create)
-		return t;
-
-	if (parms->name[0])
-		strlcpy(name, parms->name, IFNAMSIZ);
-	else
-		strcpy(name, "gre%d");
-
-	dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
-	if (!dev)
-		return NULL;
-
-	dev_net_set(dev, net);
-
-	nt = netdev_priv(dev);
-	nt->parms = *parms;
-	dev->rtnl_link_ops = &ipgre_link_ops;
 
-	dev->mtu = ipgre_tunnel_bind_dev(dev);
-
-	if (register_netdevice(dev) < 0)
-		goto failed_free;
-
-	/* Can use a lockless transmit, unless we generate output sequences */
-	if (!(nt->parms.o_flags & GRE_SEQ))
-		dev->features |= NETIF_F_LLTX;
-
-	dev_hold(dev);
-	ipgre_tunnel_link(ign, nt);
-	return nt;
-
-failed_free:
-	free_netdev(dev);
-	return NULL;
-}
-
-static void ipgre_tunnel_uninit(struct net_device *dev)
-{
-	struct net *net = dev_net(dev);
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
-	ipgre_tunnel_unlink(ign, netdev_priv(dev));
-	dev_put(dev);
+	return 0;
 }
 
-
 static void ipgre_err(struct sk_buff *skb, u32 info)
 {
 
-/* All the routers (except for Linux) return only
-   8 bytes of packet payload. It means, that precise relaying of
-   ICMP in the real Internet is absolutely infeasible.
-
-   Moreover, Cisco "wise men" put GRE key to the third word
-   in GRE header. It makes impossible maintaining even soft state for keyed
-   GRE tunnels with enabled checksum. Tell them "thank you".
-
-   Well, I wonder, rfc1812 was written by Cisco employee,
-   what the hell these idiots break standards established
-   by themselves???
- */
-
-	const struct iphdr *iph = (const struct iphdr *)skb->data;
-	__be16	     *p = (__be16 *)(skb->data+(iph->ihl<<2));
-	int grehlen = (iph->ihl<<2) + 4;
+	/* All the routers (except for Linux) return only
+	   8 bytes of packet payload. It means, that precise relaying of
+	   ICMP in the real Internet is absolutely infeasible.
+
+	   Moreover, Cisco "wise men" put GRE key to the third word
+	   in GRE header. It makes impossible maintaining even soft
+	   state for keyed GRE tunnels with enabled checksum. Tell
+	   them "thank you".
+
+	   Well, I wonder, rfc1812 was written by Cisco employee,
+	   what the hell these idiots break standards established
+	   by themselves???
+	   */
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn;
+	const struct iphdr *iph;
 	const int type = icmp_hdr(skb)->type;
 	const int code = icmp_hdr(skb)->code;
 	struct ip_tunnel *t;
-	__be16 flags;
-	__be32 key = 0;
+	struct tnl_ptk_info tpi;
+	int hdr_len;
+	bool csum_err = false;
 
-	flags = p[0];
-	if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
-		if (flags&(GRE_VERSION|GRE_ROUTING))
+	if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len)) {
+		if (!csum_err)          /* ignore csum errors. */
 			return;
-		if (flags&GRE_KEY) {
-			grehlen += 4;
-			if (flags&GRE_CSUM)
-				grehlen += 4;
-		}
 	}
 
-	/* If only 8 bytes returned, keyed message will be dropped here */
-	if (skb_headlen(skb) < grehlen)
-		return;
-
-	if (flags & GRE_KEY)
-		key = *(((__be32 *)p) + (grehlen / 4) - 1);
-
 	switch (type) {
 	default:
 	case ICMP_PARAMETERPROB:
@@ -548,8 +276,14 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
 		break;
 	}
 
-	t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr,
-				flags, key, p[1]);
+	if (tpi.proto == htons(ETH_P_TEB))
+		itn = net_generic(net, gre_tap_net_id);
+	else
+		itn = net_generic(net, ipgre_net_id);
+
+	iph = (const struct iphdr *)skb->data;
+	t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags,
+			     iph->daddr, iph->saddr, tpi.key);
 
 	if (t == NULL)
 		return;
@@ -578,612 +312,214 @@ static void ipgre_err(struct sk_buff *skb, u32 info)
 	t->err_time = jiffies;
 }
 
-static inline u8
-ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb)
-{
-	u8 inner = 0;
-	if (skb->protocol == htons(ETH_P_IP))
-		inner = old_iph->tos;
-	else if (skb->protocol == htons(ETH_P_IPV6))
-		inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
-	return INET_ECN_encapsulate(tos, inner);
-}
-
 static int ipgre_rcv(struct sk_buff *skb)
 {
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn;
 	const struct iphdr *iph;
-	u8     *h;
-	__be16    flags;
-	__sum16   csum = 0;
-	__be32 key = 0;
-	u32    seqno = 0;
 	struct ip_tunnel *tunnel;
-	int    offset = 4;
-	__be16 gre_proto;
-	int    err;
+	struct tnl_ptk_info tpi;
+	int hdr_len;
+	bool csum_err = false;
 
-	if (!pskb_may_pull(skb, 16))
+	if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len) < 0)
 		goto drop;
 
-	iph = ip_hdr(skb);
-	h = skb->data;
-	flags = *(__be16 *)h;
-
-	if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
-		/* - Version must be 0.
-		   - We do not support routing headers.
-		 */
-		if (flags&(GRE_VERSION|GRE_ROUTING))
-			goto drop;
-
-		if (flags&GRE_CSUM) {
-			switch (skb->ip_summed) {
-			case CHECKSUM_COMPLETE:
-				csum = csum_fold(skb->csum);
-				if (!csum)
-					break;
-				/* fall through */
-			case CHECKSUM_NONE:
-				skb->csum = 0;
-				csum = __skb_checksum_complete(skb);
-				skb->ip_summed = CHECKSUM_COMPLETE;
-			}
-			offset += 4;
-		}
-		if (flags&GRE_KEY) {
-			key = *(__be32 *)(h + offset);
-			offset += 4;
-		}
-		if (flags&GRE_SEQ) {
-			seqno = ntohl(*(__be32 *)(h + offset));
-			offset += 4;
-		}
-	}
+	if (tpi.proto == htons(ETH_P_TEB))
+		itn = net_generic(net, gre_tap_net_id);
+	else
+		itn = net_generic(net, ipgre_net_id);
 
-	gre_proto = *(__be16 *)(h + 2);
+	iph = ip_hdr(skb);
+	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags,
+				  iph->saddr, iph->daddr, tpi.key);
 
-	tunnel = ipgre_tunnel_lookup(skb->dev,
-				     iph->saddr, iph->daddr, flags, key,
-				     gre_proto);
 	if (tunnel) {
-		struct pcpu_tstats *tstats;
-
-		secpath_reset(skb);
-
-		skb->protocol = gre_proto;
-		/* WCCP version 1 and 2 protocol decoding.
-		 * - Change protocol to IP
-		 * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
-		 */
-		if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
-			skb->protocol = htons(ETH_P_IP);
-			if ((*(h + offset) & 0xF0) != 0x40)
-				offset += 4;
-		}
-
-		skb->mac_header = skb->network_header;
-		__pskb_pull(skb, offset);
-		skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
-		skb->pkt_type = PACKET_HOST;
-#ifdef CONFIG_NET_IPGRE_BROADCAST
-		if (ipv4_is_multicast(iph->daddr)) {
-			/* Looped back packet, drop it! */
-			if (rt_is_output_route(skb_rtable(skb)))
-				goto drop;
-			tunnel->dev->stats.multicast++;
-			skb->pkt_type = PACKET_BROADCAST;
-		}
-#endif
-
-		if (((flags&GRE_CSUM) && csum) ||
-		    (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
-			tunnel->dev->stats.rx_crc_errors++;
-			tunnel->dev->stats.rx_errors++;
-			goto drop;
-		}
-		if (tunnel->parms.i_flags&GRE_SEQ) {
-			if (!(flags&GRE_SEQ) ||
-			    (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) {
-				tunnel->dev->stats.rx_fifo_errors++;
-				tunnel->dev->stats.rx_errors++;
-				goto drop;
-			}
-			tunnel->i_seqno = seqno + 1;
-		}
-
-		/* Warning: All skb pointers will be invalidated! */
-		if (tunnel->dev->type == ARPHRD_ETHER) {
-			if (!pskb_may_pull(skb, ETH_HLEN)) {
-				tunnel->dev->stats.rx_length_errors++;
-				tunnel->dev->stats.rx_errors++;
-				goto drop;
-			}
-
-			iph = ip_hdr(skb);
-			skb->protocol = eth_type_trans(skb, tunnel->dev);
-			skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
-		}
-
-		__skb_tunnel_rx(skb, tunnel->dev);
-
-		skb_reset_network_header(skb);
-		err = IP_ECN_decapsulate(iph, skb);
-		if (unlikely(err)) {
-			if (log_ecn_error)
-				net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
-						     &iph->saddr, iph->tos);
-			if (err > 1) {
-				++tunnel->dev->stats.rx_frame_errors;
-				++tunnel->dev->stats.rx_errors;
-				goto drop;
-			}
-		}
-
-		tstats = this_cpu_ptr(tunnel->dev->tstats);
-		u64_stats_update_begin(&tstats->syncp);
-		tstats->rx_packets++;
-		tstats->rx_bytes += skb->len;
-		u64_stats_update_end(&tstats->syncp);
-
-		gro_cells_receive(&tunnel->gro_cells, skb);
+		ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
 		return 0;
 	}
 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
 drop:
 	kfree_skb(skb);
 	return 0;
 }
 
-static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+static struct sk_buff *handle_offloads(struct ip_tunnel *tunnel, struct sk_buff *skb)
 {
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-	const struct iphdr  *old_iph = ip_hdr(skb);
-	const struct iphdr  *tiph;
-	struct flowi4 fl4;
-	u8     tos;
-	__be16 df;
-	struct rtable *rt;     			/* Route to the other host */
-	struct net_device *tdev;		/* Device to other host */
-	struct iphdr  *iph;			/* Our new IP header */
-	unsigned int max_headroom;		/* The extra header space needed */
-	int    gre_hlen;
-	__be32 dst;
-	int    mtu;
-	u8     ttl;
-
-	if (skb->ip_summed == CHECKSUM_PARTIAL &&
-	    skb_checksum_help(skb))
-		goto tx_error;
-
-	if (dev->type == ARPHRD_ETHER)
-		IPCB(skb)->flags = 0;
-
-	if (dev->header_ops && dev->type == ARPHRD_IPGRE) {
-		gre_hlen = 0;
-		if (skb->protocol == htons(ETH_P_IP))
-			tiph = (const struct iphdr *)skb->data;
-		else
-			tiph = &tunnel->parms.iph;
-	} else {
-		gre_hlen = tunnel->hlen;
-		tiph = &tunnel->parms.iph;
-	}
-
-	if ((dst = tiph->daddr) == 0) {
-		/* NBMA tunnel */
-
-		if (skb_dst(skb) == NULL) {
-			dev->stats.tx_fifo_errors++;
-			goto tx_error;
-		}
-
-		if (skb->protocol == htons(ETH_P_IP)) {
-			rt = skb_rtable(skb);
-			dst = rt_nexthop(rt, old_iph->daddr);
-		}
-#if IS_ENABLED(CONFIG_IPV6)
-		else if (skb->protocol == htons(ETH_P_IPV6)) {
-			const struct in6_addr *addr6;
-			struct neighbour *neigh;
-			bool do_tx_error_icmp;
-			int addr_type;
-
-			neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr);
-			if (neigh == NULL)
-				goto tx_error;
-
-			addr6 = (const struct in6_addr *)&neigh->primary_key;
-			addr_type = ipv6_addr_type(addr6);
-
-			if (addr_type == IPV6_ADDR_ANY) {
-				addr6 = &ipv6_hdr(skb)->daddr;
-				addr_type = ipv6_addr_type(addr6);
-			}
-
-			if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
-				do_tx_error_icmp = true;
-			else {
-				do_tx_error_icmp = false;
-				dst = addr6->s6_addr32[3];
-			}
-			neigh_release(neigh);
-			if (do_tx_error_icmp)
-				goto tx_error_icmp;
-		}
-#endif
-		else
-			goto tx_error;
-	}
-
-	ttl = tiph->ttl;
-	tos = tiph->tos;
-	if (tos == 1) {
-		tos = 0;
-		if (skb->protocol == htons(ETH_P_IP))
-			tos = old_iph->tos;
-		else if (skb->protocol == htons(ETH_P_IPV6))
-			tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
-	}
+	int err;
 
-	rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr,
-				 tunnel->parms.o_key, RT_TOS(tos),
-				 tunnel->parms.link);
-	if (IS_ERR(rt)) {
-		dev->stats.tx_carrier_errors++;
-		goto tx_error;
-	}
-	tdev = rt->dst.dev;
+	if (skb_is_gso(skb)) {
+		err = skb_unclone(skb, GFP_ATOMIC);
+		if (unlikely(err))
+			goto error;
+		skb_shinfo(skb)->gso_type |= SKB_GSO_GRE;
+		return skb;
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL &&
+		   tunnel->parms.o_flags&TUNNEL_CSUM) {
+		err = skb_checksum_help(skb);
+		if (unlikely(err))
+			goto error;
+	} else if (skb->ip_summed != CHECKSUM_PARTIAL)
+		skb->ip_summed = CHECKSUM_NONE;
+
+	return skb;
+
+error:
+	kfree_skb(skb);
+	return ERR_PTR(err);
+}
 
-	if (tdev == dev) {
-		ip_rt_put(rt);
-		dev->stats.collisions++;
-		goto tx_error;
-	}
+static struct sk_buff *gre_build_header(struct sk_buff *skb,
+					const struct tnl_ptk_info *tpi,
+					int hdr_len)
+{
+	struct gre_base_hdr *greh;
 
-	df = tiph->frag_off;
-	if (df)
-		mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen;
-	else
-		mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
+	skb_push(skb, hdr_len);
 
-	if (skb_dst(skb))
-		skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+	greh = (struct gre_base_hdr *)skb->data;
+	greh->flags = tnl_flags_to_gre_flags(tpi->flags);
+	greh->protocol = tpi->proto;
 
-	if (skb->protocol == htons(ETH_P_IP)) {
-		df |= (old_iph->frag_off&htons(IP_DF));
+	if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) {
+		__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
 
-		if ((old_iph->frag_off&htons(IP_DF)) &&
-		    mtu < ntohs(old_iph->tot_len)) {
-			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
-			ip_rt_put(rt);
-			goto tx_error;
+		if (tpi->flags&TUNNEL_SEQ) {
+			*ptr = tpi->seq;
+			ptr--;
 		}
-	}
-#if IS_ENABLED(CONFIG_IPV6)
-	else if (skb->protocol == htons(ETH_P_IPV6)) {
-		struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
-
-		if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) {
-			if ((tunnel->parms.iph.daddr &&
-			     !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
-			    rt6->rt6i_dst.plen == 128) {
-				rt6->rt6i_flags |= RTF_MODIFIED;
-				dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
-			}
+		if (tpi->flags&TUNNEL_KEY) {
+			*ptr = tpi->key;
+			ptr--;
 		}
-
-		if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) {
-			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
-			ip_rt_put(rt);
-			goto tx_error;
+		if (tpi->flags&TUNNEL_CSUM &&
+		    !(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) {
+			*(__sum16 *)ptr = 0;
+			*(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
+								 skb->len, 0));
 		}
 	}
-#endif
 
-	if (tunnel->err_count > 0) {
-		if (time_before(jiffies,
-				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
-			tunnel->err_count--;
+	return skb;
+}
+
+static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
+		       const struct iphdr *tnl_params,
+		       __be16 proto)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct tnl_ptk_info tpi;
 
-			dst_link_failure(skb);
-		} else
-			tunnel->err_count = 0;
+	if (likely(!skb->encapsulation)) {
+		skb_reset_inner_headers(skb);
+		skb->encapsulation = 1;
 	}
 
-	max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len;
-
-	if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
-	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
-		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
-		if (max_headroom > dev->needed_headroom)
-			dev->needed_headroom = max_headroom;
-		if (!new_skb) {
-			ip_rt_put(rt);
-			dev->stats.tx_dropped++;
-			dev_kfree_skb(skb);
-			return NETDEV_TX_OK;
-		}
-		if (skb->sk)
-			skb_set_owner_w(new_skb, skb->sk);
-		dev_kfree_skb(skb);
-		skb = new_skb;
-		old_iph = ip_hdr(skb);
-		/* Warning : tiph value might point to freed memory */
+	tpi.flags = tunnel->parms.o_flags;
+	tpi.proto = proto;
+	tpi.key = tunnel->parms.o_key;
+	if (tunnel->parms.o_flags & TUNNEL_SEQ)
+		tunnel->o_seqno++;
+	tpi.seq = htonl(tunnel->o_seqno);
+
+	/* Push GRE header. */
+	skb = gre_build_header(skb, &tpi, tunnel->hlen);
+	if (unlikely(!skb)) {
+		dev->stats.tx_dropped++;
+		return;
 	}
 
-	skb_push(skb, gre_hlen);
-	skb_reset_network_header(skb);
-	skb_set_transport_header(skb, sizeof(*iph));
-	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
-			      IPSKB_REROUTED);
-	skb_dst_drop(skb);
-	skb_dst_set(skb, &rt->dst);
-
-	/*
-	 *	Push down and install the IPIP header.
-	 */
+	ip_tunnel_xmit(skb, dev, tnl_params);
+}
 
-	iph 			=	ip_hdr(skb);
-	iph->version		=	4;
-	iph->ihl		=	sizeof(struct iphdr) >> 2;
-	iph->frag_off		=	df;
-	iph->protocol		=	IPPROTO_GRE;
-	iph->tos		=	ipgre_ecn_encapsulate(tos, old_iph, skb);
-	iph->daddr		=	fl4.daddr;
-	iph->saddr		=	fl4.saddr;
-	iph->ttl		=	ttl;
-
-	if (ttl == 0) {
-		if (skb->protocol == htons(ETH_P_IP))
-			iph->ttl = old_iph->ttl;
-#if IS_ENABLED(CONFIG_IPV6)
-		else if (skb->protocol == htons(ETH_P_IPV6))
-			iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit;
-#endif
-		else
-			iph->ttl = ip4_dst_hoplimit(&rt->dst);
-	}
+static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
+			      struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	const struct iphdr *tnl_params;
 
-	((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags;
-	((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ?
-				   htons(ETH_P_TEB) : skb->protocol;
+	skb = handle_offloads(tunnel, skb);
+	if (IS_ERR(skb))
+		goto out;
 
-	if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
-		__be32 *ptr = (__be32 *)(((u8 *)iph) + tunnel->hlen - 4);
+	if (dev->header_ops) {
+		/* Need space for new headers */
+		if (skb_cow_head(skb, dev->needed_headroom -
+				      (tunnel->hlen + sizeof(struct iphdr))))
+			goto free_skb;
 
-		if (tunnel->parms.o_flags&GRE_SEQ) {
-			++tunnel->o_seqno;
-			*ptr = htonl(tunnel->o_seqno);
-			ptr--;
-		}
-		if (tunnel->parms.o_flags&GRE_KEY) {
-			*ptr = tunnel->parms.o_key;
-			ptr--;
-		}
-		if (tunnel->parms.o_flags&GRE_CSUM) {
-			int offset = skb_transport_offset(skb);
+		tnl_params = (const struct iphdr *)skb->data;
 
-			*ptr = 0;
-			*(__sum16 *)ptr = csum_fold(skb_checksum(skb, offset,
-								 skb->len - offset,
-								 0));
-		}
+		/* Pull skb since ip_tunnel_xmit() needs skb->data pointing
+		 * to gre header.
+		 */
+		skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
+	} else {
+		if (skb_cow_head(skb, dev->needed_headroom))
+			goto free_skb;
+
+		tnl_params = &tunnel->parms.iph;
 	}
 
-	iptunnel_xmit(skb, dev);
+	__gre_xmit(skb, dev, tnl_params, skb->protocol);
+
 	return NETDEV_TX_OK;
 
-#if IS_ENABLED(CONFIG_IPV6)
-tx_error_icmp:
-	dst_link_failure(skb);
-#endif
-tx_error:
-	dev->stats.tx_errors++;
+free_skb:
 	dev_kfree_skb(skb);
+out:
+	dev->stats.tx_dropped++;
 	return NETDEV_TX_OK;
 }
 
-static int ipgre_tunnel_bind_dev(struct net_device *dev)
+static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
+				struct net_device *dev)
 {
-	struct net_device *tdev = NULL;
-	struct ip_tunnel *tunnel;
-	const struct iphdr *iph;
-	int hlen = LL_MAX_HEADER;
-	int mtu = ETH_DATA_LEN;
-	int addend = sizeof(struct iphdr) + 4;
-
-	tunnel = netdev_priv(dev);
-	iph = &tunnel->parms.iph;
-
-	/* Guess output device to choose reasonable mtu and needed_headroom */
-
-	if (iph->daddr) {
-		struct flowi4 fl4;
-		struct rtable *rt;
-
-		rt = ip_route_output_gre(dev_net(dev), &fl4,
-					 iph->daddr, iph->saddr,
-					 tunnel->parms.o_key,
-					 RT_TOS(iph->tos),
-					 tunnel->parms.link);
-		if (!IS_ERR(rt)) {
-			tdev = rt->dst.dev;
-			ip_rt_put(rt);
-		}
-
-		if (dev->type != ARPHRD_ETHER)
-			dev->flags |= IFF_POINTOPOINT;
-	}
+	struct ip_tunnel *tunnel = netdev_priv(dev);
 
-	if (!tdev && tunnel->parms.link)
-		tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+	skb = handle_offloads(tunnel, skb);
+	if (IS_ERR(skb))
+		goto out;
 
-	if (tdev) {
-		hlen = tdev->hard_header_len + tdev->needed_headroom;
-		mtu = tdev->mtu;
-	}
-	dev->iflink = tunnel->parms.link;
-
-	/* Precalculate GRE options length */
-	if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
-		if (tunnel->parms.o_flags&GRE_CSUM)
-			addend += 4;
-		if (tunnel->parms.o_flags&GRE_KEY)
-			addend += 4;
-		if (tunnel->parms.o_flags&GRE_SEQ)
-			addend += 4;
-	}
-	dev->needed_headroom = addend + hlen;
-	mtu -= dev->hard_header_len + addend;
+	if (skb_cow_head(skb, dev->needed_headroom))
+		goto free_skb;
 
-	if (mtu < 68)
-		mtu = 68;
+	__gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
 
-	tunnel->hlen = addend;
+	return NETDEV_TX_OK;
 
-	return mtu;
+free_skb:
+	dev_kfree_skb(skb);
+out:
+	dev->stats.tx_dropped++;
+	return NETDEV_TX_OK;
 }
 
-static int
-ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
+static int ipgre_tunnel_ioctl(struct net_device *dev,
+			      struct ifreq *ifr, int cmd)
 {
 	int err = 0;
 	struct ip_tunnel_parm p;
-	struct ip_tunnel *t;
-	struct net *net = dev_net(dev);
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
-	switch (cmd) {
-	case SIOCGETTUNNEL:
-		t = NULL;
-		if (dev == ign->fb_tunnel_dev) {
-			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
-				err = -EFAULT;
-				break;
-			}
-			t = ipgre_tunnel_locate(net, &p, 0);
-		}
-		if (t == NULL)
-			t = netdev_priv(dev);
-		memcpy(&p, &t->parms, sizeof(p));
-		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
-			err = -EFAULT;
-		break;
-
-	case SIOCADDTUNNEL:
-	case SIOCCHGTUNNEL:
-		err = -EPERM;
-		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
-			goto done;
-
-		err = -EFAULT;
-		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-			goto done;
-
-		err = -EINVAL;
-		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
-		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
-		    ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)))
-			goto done;
-		if (p.iph.ttl)
-			p.iph.frag_off |= htons(IP_DF);
-
-		if (!(p.i_flags&GRE_KEY))
-			p.i_key = 0;
-		if (!(p.o_flags&GRE_KEY))
-			p.o_key = 0;
-
-		t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
-
-		if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
-			if (t != NULL) {
-				if (t->dev != dev) {
-					err = -EEXIST;
-					break;
-				}
-			} else {
-				unsigned int nflags = 0;
-
-				t = netdev_priv(dev);
-
-				if (ipv4_is_multicast(p.iph.daddr))
-					nflags = IFF_BROADCAST;
-				else if (p.iph.daddr)
-					nflags = IFF_POINTOPOINT;
-
-				if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
-					err = -EINVAL;
-					break;
-				}
-				ipgre_tunnel_unlink(ign, t);
-				synchronize_net();
-				t->parms.iph.saddr = p.iph.saddr;
-				t->parms.iph.daddr = p.iph.daddr;
-				t->parms.i_key = p.i_key;
-				t->parms.o_key = p.o_key;
-				memcpy(dev->dev_addr, &p.iph.saddr, 4);
-				memcpy(dev->broadcast, &p.iph.daddr, 4);
-				ipgre_tunnel_link(ign, t);
-				netdev_state_change(dev);
-			}
-		}
-
-		if (t) {
-			err = 0;
-			if (cmd == SIOCCHGTUNNEL) {
-				t->parms.iph.ttl = p.iph.ttl;
-				t->parms.iph.tos = p.iph.tos;
-				t->parms.iph.frag_off = p.iph.frag_off;
-				if (t->parms.link != p.link) {
-					t->parms.link = p.link;
-					dev->mtu = ipgre_tunnel_bind_dev(dev);
-					netdev_state_change(dev);
-				}
-			}
-			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
-				err = -EFAULT;
-		} else
-			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
-		break;
 
-	case SIOCDELTUNNEL:
-		err = -EPERM;
-		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
-			goto done;
-
-		if (dev == ign->fb_tunnel_dev) {
-			err = -EFAULT;
-			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-				goto done;
-			err = -ENOENT;
-			if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL)
-				goto done;
-			err = -EPERM;
-			if (t == netdev_priv(ign->fb_tunnel_dev))
-				goto done;
-			dev = t->dev;
-		}
-		unregister_netdevice(dev);
-		err = 0;
-		break;
-
-	default:
-		err = -EINVAL;
+	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+		return -EFAULT;
+	if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
+	    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
+	    ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) {
+		return -EINVAL;
 	}
+	p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
+	p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
 
-done:
-	return err;
-}
+	err = ip_tunnel_ioctl(dev, &p, cmd);
+	if (err)
+		return err;
 
-static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
-{
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-	if (new_mtu < 68 ||
-	    new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
-		return -EINVAL;
-	dev->mtu = new_mtu;
+	p.i_flags = tnl_flags_to_gre_flags(p.i_flags);
+	p.o_flags = tnl_flags_to_gre_flags(p.o_flags);
+
+	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+		return -EFAULT;
 	return 0;
 }
 
@@ -1213,25 +549,23 @@ static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
    ...
    ftp fec0:6666:6666::193.233.7.65
    ...
-
  */
-
 static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
 			unsigned short type,
 			const void *daddr, const void *saddr, unsigned int len)
 {
 	struct ip_tunnel *t = netdev_priv(dev);
-	struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen);
-	__be16 *p = (__be16 *)(iph+1);
+	struct iphdr *iph;
+	struct gre_base_hdr *greh;
 
-	memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
-	p[0]		= t->parms.o_flags;
-	p[1]		= htons(type);
+	iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph));
+	greh = (struct gre_base_hdr *)(iph+1);
+	greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags);
+	greh->protocol = htons(type);
 
-	/*
-	 *	Set the source hardware address.
-	 */
+	memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
 
+	/* Set the source hardware address. */
 	if (saddr)
 		memcpy(&iph->saddr, saddr, 4);
 	if (daddr)
@@ -1239,7 +573,7 @@ static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
 	if (iph->daddr)
 		return t->hlen;
 
-	return -t->hlen;
+	return -(t->hlen + sizeof(*iph));
 }
 
 static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
@@ -1293,31 +627,21 @@ static int ipgre_close(struct net_device *dev)
 	}
 	return 0;
 }
-
 #endif
 
 static const struct net_device_ops ipgre_netdev_ops = {
 	.ndo_init		= ipgre_tunnel_init,
-	.ndo_uninit		= ipgre_tunnel_uninit,
+	.ndo_uninit		= ip_tunnel_uninit,
 #ifdef CONFIG_NET_IPGRE_BROADCAST
 	.ndo_open		= ipgre_open,
 	.ndo_stop		= ipgre_close,
 #endif
-	.ndo_start_xmit		= ipgre_tunnel_xmit,
+	.ndo_start_xmit		= ipgre_xmit,
 	.ndo_do_ioctl		= ipgre_tunnel_ioctl,
-	.ndo_change_mtu		= ipgre_tunnel_change_mtu,
-	.ndo_get_stats64	= ipgre_get_stats64,
+	.ndo_change_mtu		= ip_tunnel_change_mtu,
+	.ndo_get_stats64	= ip_tunnel_get_stats64,
 };
 
-static void ipgre_dev_free(struct net_device *dev)
-{
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-
-	gro_cells_destroy(&tunnel->gro_cells);
-	free_percpu(dev->tstats);
-	free_netdev(dev);
-}
-
 #define GRE_FEATURES (NETIF_F_SG |		\
 		      NETIF_F_FRAGLIST |	\
 		      NETIF_F_HIGHDMA |		\
@@ -1326,35 +650,48 @@ static void ipgre_dev_free(struct net_device *dev)
 static void ipgre_tunnel_setup(struct net_device *dev)
 {
 	dev->netdev_ops		= &ipgre_netdev_ops;
-	dev->destructor 	= ipgre_dev_free;
+	ip_tunnel_setup(dev, ipgre_net_id);
+}
 
-	dev->type		= ARPHRD_IPGRE;
-	dev->needed_headroom 	= LL_MAX_HEADER + sizeof(struct iphdr) + 4;
+static void __gre_tunnel_init(struct net_device *dev)
+{
+	struct ip_tunnel *tunnel;
+
+	tunnel = netdev_priv(dev);
+	tunnel->hlen = ip_gre_calc_hlen(tunnel->parms.o_flags);
+	tunnel->parms.iph.protocol = IPPROTO_GRE;
+
+	dev->needed_headroom	= LL_MAX_HEADER + sizeof(struct iphdr) + 4;
 	dev->mtu		= ETH_DATA_LEN - sizeof(struct iphdr) - 4;
-	dev->flags		= IFF_NOARP;
-	dev->iflink		= 0;
-	dev->addr_len		= 4;
-	dev->features		|= NETIF_F_NETNS_LOCAL;
-	dev->priv_flags		&= ~IFF_XMIT_DST_RELEASE;
 
-	dev->features		|= GRE_FEATURES;
+	dev->features		|= NETIF_F_NETNS_LOCAL | GRE_FEATURES;
 	dev->hw_features	|= GRE_FEATURES;
+
+	if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
+		/* TCP offload with GRE SEQ is not supported. */
+		dev->features    |= NETIF_F_GSO_SOFTWARE;
+		dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+		/* Can use a lockless transmit, unless we generate
+		 * output sequences
+		 */
+		dev->features |= NETIF_F_LLTX;
+	}
 }
 
 static int ipgre_tunnel_init(struct net_device *dev)
 {
-	struct ip_tunnel *tunnel;
-	struct iphdr *iph;
-	int err;
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct iphdr *iph = &tunnel->parms.iph;
 
-	tunnel = netdev_priv(dev);
-	iph = &tunnel->parms.iph;
+	__gre_tunnel_init(dev);
 
-	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);
+	memcpy(dev->dev_addr, &iph->saddr, 4);
+	memcpy(dev->broadcast, &iph->daddr, 4);
 
-	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
-	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
+	dev->type		= ARPHRD_IPGRE;
+	dev->flags		= IFF_NOARP;
+	dev->priv_flags		&= ~IFF_XMIT_DST_RELEASE;
+	dev->addr_len		= 4;
 
 	if (iph->daddr) {
 #ifdef CONFIG_NET_IPGRE_BROADCAST
@@ -1368,106 +705,30 @@ static int ipgre_tunnel_init(struct net_device *dev)
 	} else
 		dev->header_ops = &ipgre_header_ops;
 
-	dev->tstats = alloc_percpu(struct pcpu_tstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
-	err = gro_cells_init(&tunnel->gro_cells, dev);
-	if (err) {
-		free_percpu(dev->tstats);
-		return err;
-	}
-
-	return 0;
+	return ip_tunnel_init(dev);
 }
 
-static void ipgre_fb_tunnel_init(struct net_device *dev)
-{
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-	struct iphdr *iph = &tunnel->parms.iph;
-
-	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);
-
-	iph->version		= 4;
-	iph->protocol		= IPPROTO_GRE;
-	iph->ihl		= 5;
-	tunnel->hlen		= sizeof(struct iphdr) + 4;
-
-	dev_hold(dev);
-}
-
-
 static const struct gre_protocol ipgre_protocol = {
 	.handler     = ipgre_rcv,
 	.err_handler = ipgre_err,
 };
 
-static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head)
-{
-	int prio;
-
-	for (prio = 0; prio < 4; prio++) {
-		int h;
-		for (h = 0; h < HASH_SIZE; h++) {
-			struct ip_tunnel *t;
-
-			t = rtnl_dereference(ign->tunnels[prio][h]);
-
-			while (t != NULL) {
-				unregister_netdevice_queue(t->dev, head);
-				t = rtnl_dereference(t->next);
-			}
-		}
-	}
-}
-
 static int __net_init ipgre_init_net(struct net *net)
 {
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-	int err;
-
-	ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
-					   ipgre_tunnel_setup);
-	if (!ign->fb_tunnel_dev) {
-		err = -ENOMEM;
-		goto err_alloc_dev;
-	}
-	dev_net_set(ign->fb_tunnel_dev, net);
-
-	ipgre_fb_tunnel_init(ign->fb_tunnel_dev);
-	ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops;
-
-	if ((err = register_netdev(ign->fb_tunnel_dev)))
-		goto err_reg_dev;
-
-	rcu_assign_pointer(ign->tunnels_wc[0],
-			   netdev_priv(ign->fb_tunnel_dev));
-	return 0;
-
-err_reg_dev:
-	ipgre_dev_free(ign->fb_tunnel_dev);
-err_alloc_dev:
-	return err;
+	return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
 }
 
 static void __net_exit ipgre_exit_net(struct net *net)
 {
-	struct ipgre_net *ign;
-	LIST_HEAD(list);
-
-	ign = net_generic(net, ipgre_net_id);
-	rtnl_lock();
-	ipgre_destroy_tunnels(ign, &list);
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+	struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
+	ip_tunnel_delete_net(itn);
 }
 
 static struct pernet_operations ipgre_net_ops = {
 	.init = ipgre_init_net,
 	.exit = ipgre_exit_net,
 	.id   = &ipgre_net_id,
-	.size = sizeof(struct ipgre_net),
+	.size = sizeof(struct ip_tunnel_net),
 };
 
 static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -1512,8 +773,8 @@ out:
 	return ipgre_tunnel_validate(tb, data);
 }
 
-static void ipgre_netlink_parms(struct nlattr *data[],
-				struct ip_tunnel_parm *parms)
+static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[],
+			       struct ip_tunnel_parm *parms)
 {
 	memset(parms, 0, sizeof(*parms));
 
@@ -1526,10 +787,10 @@ static void ipgre_netlink_parms(struct nlattr *data[],
 		parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
 
 	if (data[IFLA_GRE_IFLAGS])
-		parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
+		parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS]));
 
 	if (data[IFLA_GRE_OFLAGS])
-		parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
+		parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS]));
 
 	if (data[IFLA_GRE_IKEY])
 		parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
@@ -1553,145 +814,46 @@ static void ipgre_netlink_parms(struct nlattr *data[],
 		parms->iph.frag_off = htons(IP_DF);
 }
 
-static int ipgre_tap_init(struct net_device *dev)
+static int gre_tap_init(struct net_device *dev)
 {
-	struct ip_tunnel *tunnel;
-
-	tunnel = netdev_priv(dev);
-
-	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);
+	__gre_tunnel_init(dev);
 
-	ipgre_tunnel_bind_dev(dev);
-
-	dev->tstats = alloc_percpu(struct pcpu_tstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
-	return 0;
+	return ip_tunnel_init(dev);
 }
 
-static const struct net_device_ops ipgre_tap_netdev_ops = {
-	.ndo_init		= ipgre_tap_init,
-	.ndo_uninit		= ipgre_tunnel_uninit,
-	.ndo_start_xmit		= ipgre_tunnel_xmit,
+static const struct net_device_ops gre_tap_netdev_ops = {
+	.ndo_init		= gre_tap_init,
+	.ndo_uninit		= ip_tunnel_uninit,
+	.ndo_start_xmit		= gre_tap_xmit,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_change_mtu		= ipgre_tunnel_change_mtu,
-	.ndo_get_stats64	= ipgre_get_stats64,
+	.ndo_change_mtu		= ip_tunnel_change_mtu,
+	.ndo_get_stats64	= ip_tunnel_get_stats64,
 };
 
 static void ipgre_tap_setup(struct net_device *dev)
 {
-
 	ether_setup(dev);
-
-	dev->netdev_ops		= &ipgre_tap_netdev_ops;
-	dev->destructor 	= ipgre_dev_free;
-
-	dev->iflink		= 0;
-	dev->features		|= NETIF_F_NETNS_LOCAL;
+	dev->netdev_ops		= &gre_tap_netdev_ops;
+	ip_tunnel_setup(dev, gre_tap_net_id);
 }
 
-static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[],
-			 struct nlattr *data[])
+static int ipgre_newlink(struct net *src_net, struct net_device *dev,
+			 struct nlattr *tb[], struct nlattr *data[])
 {
-	struct ip_tunnel *nt;
-	struct net *net = dev_net(dev);
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-	int mtu;
-	int err;
-
-	nt = netdev_priv(dev);
-	ipgre_netlink_parms(data, &nt->parms);
-
-	if (ipgre_tunnel_find(net, &nt->parms, dev->type))
-		return -EEXIST;
-
-	if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
-		eth_hw_addr_random(dev);
-
-	mtu = ipgre_tunnel_bind_dev(dev);
-	if (!tb[IFLA_MTU])
-		dev->mtu = mtu;
-
-	/* Can use a lockless transmit, unless we generate output sequences */
-	if (!(nt->parms.o_flags & GRE_SEQ))
-		dev->features |= NETIF_F_LLTX;
-
-	err = register_netdevice(dev);
-	if (err)
-		goto out;
-
-	dev_hold(dev);
-	ipgre_tunnel_link(ign, nt);
+	struct ip_tunnel_parm p;
 
-out:
-	return err;
+	ipgre_netlink_parms(data, tb, &p);
+	return ip_tunnel_newlink(dev, tb, &p);
 }
 
 static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
 			    struct nlattr *data[])
 {
-	struct ip_tunnel *t, *nt;
-	struct net *net = dev_net(dev);
-	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
 	struct ip_tunnel_parm p;
-	int mtu;
-
-	if (dev == ign->fb_tunnel_dev)
-		return -EINVAL;
-
-	nt = netdev_priv(dev);
-	ipgre_netlink_parms(data, &p);
-
-	t = ipgre_tunnel_locate(net, &p, 0);
-
-	if (t) {
-		if (t->dev != dev)
-			return -EEXIST;
-	} else {
-		t = nt;
-
-		if (dev->type != ARPHRD_ETHER) {
-			unsigned int nflags = 0;
-
-			if (ipv4_is_multicast(p.iph.daddr))
-				nflags = IFF_BROADCAST;
-			else if (p.iph.daddr)
-				nflags = IFF_POINTOPOINT;
-
-			if ((dev->flags ^ nflags) &
-			    (IFF_POINTOPOINT | IFF_BROADCAST))
-				return -EINVAL;
-		}
 
-		ipgre_tunnel_unlink(ign, t);
-		t->parms.iph.saddr = p.iph.saddr;
-		t->parms.iph.daddr = p.iph.daddr;
-		t->parms.i_key = p.i_key;
-		if (dev->type != ARPHRD_ETHER) {
-			memcpy(dev->dev_addr, &p.iph.saddr, 4);
-			memcpy(dev->broadcast, &p.iph.daddr, 4);
-		}
-		ipgre_tunnel_link(ign, t);
-		netdev_state_change(dev);
-	}
-
-	t->parms.o_key = p.o_key;
-	t->parms.iph.ttl = p.iph.ttl;
-	t->parms.iph.tos = p.iph.tos;
-	t->parms.iph.frag_off = p.iph.frag_off;
-
-	if (t->parms.link != p.link) {
-		t->parms.link = p.link;
-		mtu = ipgre_tunnel_bind_dev(dev);
-		if (!tb[IFLA_MTU])
-			dev->mtu = mtu;
-		netdev_state_change(dev);
-	}
-
-	return 0;
+	ipgre_netlink_parms(data, tb, &p);
+	return ip_tunnel_changelink(dev, tb, &p);
 }
 
 static size_t ipgre_get_size(const struct net_device *dev)
@@ -1726,8 +888,8 @@ static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	struct ip_tunnel_parm *p = &t->parms;
 
 	if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
-	    nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
-	    nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
+	    nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) ||
+	    nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) ||
 	    nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
 	    nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
 	    nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) ||
@@ -1765,6 +927,7 @@ static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
 	.validate	= ipgre_tunnel_validate,
 	.newlink	= ipgre_newlink,
 	.changelink	= ipgre_changelink,
+	.dellink	= ip_tunnel_dellink,
 	.get_size	= ipgre_get_size,
 	.fill_info	= ipgre_fill_info,
 };
@@ -1778,13 +941,28 @@ static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
 	.validate	= ipgre_tap_validate,
 	.newlink	= ipgre_newlink,
 	.changelink	= ipgre_changelink,
+	.dellink	= ip_tunnel_dellink,
 	.get_size	= ipgre_get_size,
 	.fill_info	= ipgre_fill_info,
 };
 
-/*
- *	And now the modules code and kernel interface.
- */
+static int __net_init ipgre_tap_init_net(struct net *net)
+{
+	return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, NULL);
+}
+
+static void __net_exit ipgre_tap_exit_net(struct net *net)
+{
+	struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id);
+	ip_tunnel_delete_net(itn);
+}
+
+static struct pernet_operations ipgre_tap_net_ops = {
+	.init = ipgre_tap_init_net,
+	.exit = ipgre_tap_exit_net,
+	.id   = &gre_tap_net_id,
+	.size = sizeof(struct ip_tunnel_net),
+};
 
 static int __init ipgre_init(void)
 {
@@ -1796,6 +974,10 @@ static int __init ipgre_init(void)
 	if (err < 0)
 		return err;
 
+	err = register_pernet_device(&ipgre_tap_net_ops);
+	if (err < 0)
+		goto pnet_tap_faied;
+
 	err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
 	if (err < 0) {
 		pr_info("%s: can't add protocol\n", __func__);
@@ -1810,16 +992,17 @@ static int __init ipgre_init(void)
 	if (err < 0)
 		goto tap_ops_failed;
 
-out:
-	return err;
+	return 0;
 
 tap_ops_failed:
 	rtnl_link_unregister(&ipgre_link_ops);
 rtnl_link_failed:
 	gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
 add_proto_failed:
+	unregister_pernet_device(&ipgre_tap_net_ops);
+pnet_tap_faied:
 	unregister_pernet_device(&ipgre_net_ops);
-	goto out;
+	return err;
 }
 
 static void __exit ipgre_fini(void)
@@ -1828,6 +1011,7 @@ static void __exit ipgre_fini(void)
 	rtnl_link_unregister(&ipgre_link_ops);
 	if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0)
 		pr_info("%s: can't remove protocol\n", __func__);
+	unregister_pernet_device(&ipgre_tap_net_ops);
 	unregister_pernet_device(&ipgre_net_ops);
 }
 
@@ -1837,3 +1021,4 @@ MODULE_LICENSE("GPL");
 MODULE_ALIAS_RTNL_LINK("gre");
 MODULE_ALIAS_RTNL_LINK("gretap");
 MODULE_ALIAS_NETDEV("gre0");
+MODULE_ALIAS_NETDEV("gretap0");
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index b007afb..64df5f5 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -208,13 +208,6 @@ static int ip_local_deliver_finish(struct sk_buff *skb)
 		if (ipprot != NULL) {
 			int ret;
 
-			if (!net_eq(net, &init_net) && !ipprot->netns_ok) {
-				net_info_ratelimited("%s: proto %d isn't netns-ready\n",
-						     __func__, protocol);
-				kfree_skb(skb);
-				goto out;
-			}
-
 			if (!ipprot->no_policy) {
 				if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
 					kfree_skb(skb);
@@ -235,9 +228,11 @@ static int ip_local_deliver_finish(struct sk_buff *skb)
 					icmp_send(skb, ICMP_DEST_UNREACH,
 						  ICMP_PROT_UNREACH, 0);
 				}
-			} else
+				kfree_skb(skb);
+			} else {
 				IP_INC_STATS_BH(net, IPSTATS_MIB_INDELIVERS);
-			kfree_skb(skb);
+				consume_skb(skb);
+			}
 		}
 	}
  out:
@@ -425,7 +420,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 	iph = ip_hdr(skb);
 
 	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
-		goto inhdr_error;
+		goto csum_error;
 
 	len = ntohs(iph->tot_len);
 	if (skb->len < len) {
@@ -452,6 +447,8 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 	return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, dev, NULL,
 		       ip_rcv_finish);
 
+csum_error:
+	IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_CSUMERRORS);
 inhdr_error:
 	IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS);
 drop:
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index a47fc1d..d1f8e10 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -370,7 +370,6 @@ int ip_options_compile(struct net *net,
 				}
 				switch (optptr[3]&0xF) {
 				      case IPOPT_TS_TSONLY:
-					opt->ts = optptr - iph;
 					if (skb)
 						timeptr = &optptr[optptr[2]-1];
 					opt->ts_needtime = 1;
@@ -381,7 +380,6 @@ int ip_options_compile(struct net *net,
 						pp_ptr = optptr + 2;
 						goto error;
 					}
-					opt->ts = optptr - iph;
 					if (rt)  {
 						spec_dst_fill(&spec_dst, skb);
 						memcpy(&optptr[optptr[2]-1], &spec_dst, 4);
@@ -396,7 +394,6 @@ int ip_options_compile(struct net *net,
 						pp_ptr = optptr + 2;
 						goto error;
 					}
-					opt->ts = optptr - iph;
 					{
 						__be32 addr;
 						memcpy(&addr, &optptr[optptr[2]-1], 4);
@@ -423,18 +420,18 @@ int ip_options_compile(struct net *net,
 					put_unaligned_be32(midtime, timeptr);
 					opt->is_changed = 1;
 				}
-			} else {
+			} else if ((optptr[3]&0xF) != IPOPT_TS_PRESPEC) {
 				unsigned int overflow = optptr[3]>>4;
 				if (overflow == 15) {
 					pp_ptr = optptr + 3;
 					goto error;
 				}
-				opt->ts = optptr - iph;
 				if (skb) {
 					optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4);
 					opt->is_changed = 1;
 				}
 			}
+			opt->ts = optptr - iph;
 			break;
 		      case IPOPT_RA:
 			if (optlen < 4) {
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 3e98ed2..4bcabf3 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -84,7 +84,7 @@ int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
 EXPORT_SYMBOL(sysctl_ip_default_ttl);
 
 /* Generate a checksum for an outgoing IP datagram. */
-__inline__ void ip_send_check(struct iphdr *iph)
+void ip_send_check(struct iphdr *iph)
 {
 	iph->check = 0;
 	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
@@ -430,8 +430,7 @@ static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
 	to->tc_index = from->tc_index;
 #endif
 	nf_copy(to, from);
-#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
-    defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
 	to->nf_trace = from->nf_trace;
 #endif
 #if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
@@ -598,6 +597,7 @@ slow_path:
 	/* for offloaded checksums cleanup checksum before fragmentation */
 	if ((skb->ip_summed == CHECKSUM_PARTIAL) && skb_checksum_help(skb))
 		goto fail;
+	iph = ip_hdr(skb);
 
 	left = skb->len - hlen;		/* Space per frame */
 	ptr = hlen;		/* Where to start from */
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
new file mode 100644
index 0000000..7fa8f08
--- /dev/null
+++ b/net/ipv4/ip_tunnel.c
@@ -0,0 +1,1035 @@
+/*
+ * Copyright (c) 2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/if_arp.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <linux/in6.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/rculist.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/ip_tunnels.h>
+#include <net/arp.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#endif
+
+static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
+				   __be32 key, __be32 remote)
+{
+	return hash_32((__force u32)key ^ (__force u32)remote,
+			 IP_TNL_HASH_BITS);
+}
+
+/* Often modified stats are per cpu, other are shared (netdev->stats) */
+struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
+						struct rtnl_link_stats64 *tot)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
+		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin_bh(&tstats->syncp);
+			rx_packets = tstats->rx_packets;
+			tx_packets = tstats->tx_packets;
+			rx_bytes = tstats->rx_bytes;
+			tx_bytes = tstats->tx_bytes;
+		} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
+
+		tot->rx_packets += rx_packets;
+		tot->tx_packets += tx_packets;
+		tot->rx_bytes   += rx_bytes;
+		tot->tx_bytes   += tx_bytes;
+	}
+
+	tot->multicast = dev->stats.multicast;
+
+	tot->rx_crc_errors = dev->stats.rx_crc_errors;
+	tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
+	tot->rx_length_errors = dev->stats.rx_length_errors;
+	tot->rx_frame_errors = dev->stats.rx_frame_errors;
+	tot->rx_errors = dev->stats.rx_errors;
+
+	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
+	tot->tx_dropped = dev->stats.tx_dropped;
+	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
+	tot->tx_errors = dev->stats.tx_errors;
+
+	tot->collisions  = dev->stats.collisions;
+
+	return tot;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
+
+static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
+				__be16 flags, __be32 key)
+{
+	if (p->i_flags & TUNNEL_KEY) {
+		if (flags & TUNNEL_KEY)
+			return key == p->i_key;
+		else
+			/* key expected, none present */
+			return false;
+	} else
+		return !(flags & TUNNEL_KEY);
+}
+
+/* Fallback tunnel: no source, no destination, no key, no options
+
+   Tunnel hash table:
+   We require exact key match i.e. if a key is present in packet
+   it will match only tunnel with the same key; if it is not present,
+   it will match only keyless tunnel.
+
+   All keysless packets, if not matched configured keyless tunnels
+   will match fallback tunnel.
+   Given src, dst and key, find appropriate for input tunnel.
+*/
+struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
+				   int link, __be16 flags,
+				   __be32 remote, __be32 local,
+				   __be32 key)
+{
+	unsigned int hash;
+	struct ip_tunnel *t, *cand = NULL;
+	struct hlist_head *head;
+
+	hash = ip_tunnel_hash(itn, key, remote);
+	head = &itn->tunnels[hash];
+
+	hlist_for_each_entry_rcu(t, head, hash_node) {
+		if (local != t->parms.iph.saddr ||
+		    remote != t->parms.iph.daddr ||
+		    !(t->dev->flags & IFF_UP))
+			continue;
+
+		if (!ip_tunnel_key_match(&t->parms, flags, key))
+			continue;
+
+		if (t->parms.link == link)
+			return t;
+		else
+			cand = t;
+	}
+
+	hlist_for_each_entry_rcu(t, head, hash_node) {
+		if (remote != t->parms.iph.daddr ||
+		    !(t->dev->flags & IFF_UP))
+			continue;
+
+		if (!ip_tunnel_key_match(&t->parms, flags, key))
+			continue;
+
+		if (t->parms.link == link)
+			return t;
+		else if (!cand)
+			cand = t;
+	}
+
+	hash = ip_tunnel_hash(itn, key, 0);
+	head = &itn->tunnels[hash];
+
+	hlist_for_each_entry_rcu(t, head, hash_node) {
+		if ((local != t->parms.iph.saddr &&
+		     (local != t->parms.iph.daddr ||
+		      !ipv4_is_multicast(local))) ||
+		    !(t->dev->flags & IFF_UP))
+			continue;
+
+		if (!ip_tunnel_key_match(&t->parms, flags, key))
+			continue;
+
+		if (t->parms.link == link)
+			return t;
+		else if (!cand)
+			cand = t;
+	}
+
+	if (flags & TUNNEL_NO_KEY)
+		goto skip_key_lookup;
+
+	hlist_for_each_entry_rcu(t, head, hash_node) {
+		if (t->parms.i_key != key ||
+		    !(t->dev->flags & IFF_UP))
+			continue;
+
+		if (t->parms.link == link)
+			return t;
+		else if (!cand)
+			cand = t;
+	}
+
+skip_key_lookup:
+	if (cand)
+		return cand;
+
+	if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
+		return netdev_priv(itn->fb_tunnel_dev);
+
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
+
+static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
+				    struct ip_tunnel_parm *parms)
+{
+	unsigned int h;
+	__be32 remote;
+
+	if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
+		remote = parms->iph.daddr;
+	else
+		remote = 0;
+
+	h = ip_tunnel_hash(itn, parms->i_key, remote);
+	return &itn->tunnels[h];
+}
+
+static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
+{
+	struct hlist_head *head = ip_bucket(itn, &t->parms);
+
+	hlist_add_head_rcu(&t->hash_node, head);
+}
+
+static void ip_tunnel_del(struct ip_tunnel *t)
+{
+	hlist_del_init_rcu(&t->hash_node);
+}
+
+static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
+					struct ip_tunnel_parm *parms,
+					int type)
+{
+	__be32 remote = parms->iph.daddr;
+	__be32 local = parms->iph.saddr;
+	__be32 key = parms->i_key;
+	int link = parms->link;
+	struct ip_tunnel *t = NULL;
+	struct hlist_head *head = ip_bucket(itn, parms);
+
+	hlist_for_each_entry_rcu(t, head, hash_node) {
+		if (local == t->parms.iph.saddr &&
+		    remote == t->parms.iph.daddr &&
+		    key == t->parms.i_key &&
+		    link == t->parms.link &&
+		    type == t->dev->type)
+			break;
+	}
+	return t;
+}
+
+static struct net_device *__ip_tunnel_create(struct net *net,
+					     const struct rtnl_link_ops *ops,
+					     struct ip_tunnel_parm *parms)
+{
+	int err;
+	struct ip_tunnel *tunnel;
+	struct net_device *dev;
+	char name[IFNAMSIZ];
+
+	if (parms->name[0])
+		strlcpy(name, parms->name, IFNAMSIZ);
+	else {
+		if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
+			err = -E2BIG;
+			goto failed;
+		}
+		strlcpy(name, ops->kind, IFNAMSIZ);
+		strncat(name, "%d", 2);
+	}
+
+	ASSERT_RTNL();
+	dev = alloc_netdev(ops->priv_size, name, ops->setup);
+	if (!dev) {
+		err = -ENOMEM;
+		goto failed;
+	}
+	dev_net_set(dev, net);
+
+	dev->rtnl_link_ops = ops;
+
+	tunnel = netdev_priv(dev);
+	tunnel->parms = *parms;
+
+	err = register_netdevice(dev);
+	if (err)
+		goto failed_free;
+
+	return dev;
+
+failed_free:
+	free_netdev(dev);
+failed:
+	return ERR_PTR(err);
+}
+
+static inline struct rtable *ip_route_output_tunnel(struct net *net,
+						    struct flowi4 *fl4,
+						    int proto,
+						    __be32 daddr, __be32 saddr,
+						    __be32 key, __u8 tos, int oif)
+{
+	memset(fl4, 0, sizeof(*fl4));
+	fl4->flowi4_oif = oif;
+	fl4->daddr = daddr;
+	fl4->saddr = saddr;
+	fl4->flowi4_tos = tos;
+	fl4->flowi4_proto = proto;
+	fl4->fl4_gre_key = key;
+	return ip_route_output_key(net, fl4);
+}
+
+static int ip_tunnel_bind_dev(struct net_device *dev)
+{
+	struct net_device *tdev = NULL;
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	const struct iphdr *iph;
+	int hlen = LL_MAX_HEADER;
+	int mtu = ETH_DATA_LEN;
+	int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+	iph = &tunnel->parms.iph;
+
+	/* Guess output device to choose reasonable mtu and needed_headroom */
+	if (iph->daddr) {
+		struct flowi4 fl4;
+		struct rtable *rt;
+
+		rt = ip_route_output_tunnel(dev_net(dev), &fl4,
+					    tunnel->parms.iph.protocol,
+					    iph->daddr, iph->saddr,
+					    tunnel->parms.o_key,
+					    RT_TOS(iph->tos),
+					    tunnel->parms.link);
+		if (!IS_ERR(rt)) {
+			tdev = rt->dst.dev;
+			ip_rt_put(rt);
+		}
+		if (dev->type != ARPHRD_ETHER)
+			dev->flags |= IFF_POINTOPOINT;
+	}
+
+	if (!tdev && tunnel->parms.link)
+		tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+
+	if (tdev) {
+		hlen = tdev->hard_header_len + tdev->needed_headroom;
+		mtu = tdev->mtu;
+	}
+	dev->iflink = tunnel->parms.link;
+
+	dev->needed_headroom = t_hlen + hlen;
+	mtu -= (dev->hard_header_len + t_hlen);
+
+	if (mtu < 68)
+		mtu = 68;
+
+	return mtu;
+}
+
+static struct ip_tunnel *ip_tunnel_create(struct net *net,
+					  struct ip_tunnel_net *itn,
+					  struct ip_tunnel_parm *parms)
+{
+	struct ip_tunnel *nt, *fbt;
+	struct net_device *dev;
+
+	BUG_ON(!itn->fb_tunnel_dev);
+	fbt = netdev_priv(itn->fb_tunnel_dev);
+	dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
+	if (IS_ERR(dev))
+		return NULL;
+
+	dev->mtu = ip_tunnel_bind_dev(dev);
+
+	nt = netdev_priv(dev);
+	ip_tunnel_add(itn, nt);
+	return nt;
+}
+
+int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
+		  const struct tnl_ptk_info *tpi, bool log_ecn_error)
+{
+	struct pcpu_tstats *tstats;
+	const struct iphdr *iph = ip_hdr(skb);
+	int err;
+
+	secpath_reset(skb);
+
+	skb->protocol = tpi->proto;
+
+	skb->mac_header = skb->network_header;
+	__pskb_pull(skb, tunnel->hlen);
+	skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen);
+#ifdef CONFIG_NET_IPGRE_BROADCAST
+	if (ipv4_is_multicast(iph->daddr)) {
+		/* Looped back packet, drop it! */
+		if (rt_is_output_route(skb_rtable(skb)))
+			goto drop;
+		tunnel->dev->stats.multicast++;
+		skb->pkt_type = PACKET_BROADCAST;
+	}
+#endif
+
+	if ((!(tpi->flags&TUNNEL_CSUM) &&  (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
+	     ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
+		tunnel->dev->stats.rx_crc_errors++;
+		tunnel->dev->stats.rx_errors++;
+		goto drop;
+	}
+
+	if (tunnel->parms.i_flags&TUNNEL_SEQ) {
+		if (!(tpi->flags&TUNNEL_SEQ) ||
+		    (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
+			tunnel->dev->stats.rx_fifo_errors++;
+			tunnel->dev->stats.rx_errors++;
+			goto drop;
+		}
+		tunnel->i_seqno = ntohl(tpi->seq) + 1;
+	}
+
+	/* Warning: All skb pointers will be invalidated! */
+	if (tunnel->dev->type == ARPHRD_ETHER) {
+		if (!pskb_may_pull(skb, ETH_HLEN)) {
+			tunnel->dev->stats.rx_length_errors++;
+			tunnel->dev->stats.rx_errors++;
+			goto drop;
+		}
+
+		iph = ip_hdr(skb);
+		skb->protocol = eth_type_trans(skb, tunnel->dev);
+		skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+	}
+
+	skb->pkt_type = PACKET_HOST;
+	__skb_tunnel_rx(skb, tunnel->dev);
+
+	skb_reset_network_header(skb);
+	err = IP_ECN_decapsulate(iph, skb);
+	if (unlikely(err)) {
+		if (log_ecn_error)
+			net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+					&iph->saddr, iph->tos);
+		if (err > 1) {
+			++tunnel->dev->stats.rx_frame_errors;
+			++tunnel->dev->stats.rx_errors;
+			goto drop;
+		}
+	}
+
+	tstats = this_cpu_ptr(tunnel->dev->tstats);
+	u64_stats_update_begin(&tstats->syncp);
+	tstats->rx_packets++;
+	tstats->rx_bytes += skb->len;
+	u64_stats_update_end(&tstats->syncp);
+
+	gro_cells_receive(&tunnel->gro_cells, skb);
+	return 0;
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
+
+void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
+		    const struct iphdr *tnl_params)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	const struct iphdr *inner_iph;
+	struct iphdr *iph;
+	struct flowi4 fl4;
+	u8     tos, ttl;
+	__be16 df;
+	struct rtable *rt;		/* Route to the other host */
+	struct net_device *tdev;	/* Device to other host */
+	unsigned int max_headroom;	/* The extra header space needed */
+	__be32 dst;
+	int mtu;
+
+	inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
+
+	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+	dst = tnl_params->daddr;
+	if (dst == 0) {
+		/* NBMA tunnel */
+
+		if (skb_dst(skb) == NULL) {
+			dev->stats.tx_fifo_errors++;
+			goto tx_error;
+		}
+
+		if (skb->protocol == htons(ETH_P_IP)) {
+			rt = skb_rtable(skb);
+			dst = rt_nexthop(rt, inner_iph->daddr);
+		}
+#if IS_ENABLED(CONFIG_IPV6)
+		else if (skb->protocol == htons(ETH_P_IPV6)) {
+			const struct in6_addr *addr6;
+			struct neighbour *neigh;
+			bool do_tx_error_icmp;
+			int addr_type;
+
+			neigh = dst_neigh_lookup(skb_dst(skb),
+						 &ipv6_hdr(skb)->daddr);
+			if (neigh == NULL)
+				goto tx_error;
+
+			addr6 = (const struct in6_addr *)&neigh->primary_key;
+			addr_type = ipv6_addr_type(addr6);
+
+			if (addr_type == IPV6_ADDR_ANY) {
+				addr6 = &ipv6_hdr(skb)->daddr;
+				addr_type = ipv6_addr_type(addr6);
+			}
+
+			if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
+				do_tx_error_icmp = true;
+			else {
+				do_tx_error_icmp = false;
+				dst = addr6->s6_addr32[3];
+			}
+			neigh_release(neigh);
+			if (do_tx_error_icmp)
+				goto tx_error_icmp;
+		}
+#endif
+		else
+			goto tx_error;
+	}
+
+	tos = tnl_params->tos;
+	if (tos & 0x1) {
+		tos &= ~0x1;
+		if (skb->protocol == htons(ETH_P_IP))
+			tos = inner_iph->tos;
+		else if (skb->protocol == htons(ETH_P_IPV6))
+			tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
+	}
+
+	rt = ip_route_output_tunnel(dev_net(dev), &fl4,
+				    tunnel->parms.iph.protocol,
+				    dst, tnl_params->saddr,
+				    tunnel->parms.o_key,
+				    RT_TOS(tos),
+				    tunnel->parms.link);
+	if (IS_ERR(rt)) {
+		dev->stats.tx_carrier_errors++;
+		goto tx_error;
+	}
+	tdev = rt->dst.dev;
+
+	if (tdev == dev) {
+		ip_rt_put(rt);
+		dev->stats.collisions++;
+		goto tx_error;
+	}
+
+	df = tnl_params->frag_off;
+
+	if (df)
+		mtu = dst_mtu(&rt->dst) - dev->hard_header_len
+					- sizeof(struct iphdr);
+	else
+		mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
+
+	if (skb_dst(skb))
+		skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+
+	if (skb->protocol == htons(ETH_P_IP)) {
+		df |= (inner_iph->frag_off&htons(IP_DF));
+
+		if (!skb_is_gso(skb) &&
+		    (inner_iph->frag_off&htons(IP_DF)) &&
+		     mtu < ntohs(inner_iph->tot_len)) {
+			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
+			ip_rt_put(rt);
+			goto tx_error;
+		}
+	}
+#if IS_ENABLED(CONFIG_IPV6)
+	else if (skb->protocol == htons(ETH_P_IPV6)) {
+		struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
+
+		if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
+		    mtu >= IPV6_MIN_MTU) {
+			if ((tunnel->parms.iph.daddr &&
+			    !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
+			    rt6->rt6i_dst.plen == 128) {
+				rt6->rt6i_flags |= RTF_MODIFIED;
+				dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
+			}
+		}
+
+		if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
+		    mtu < skb->len) {
+			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+			ip_rt_put(rt);
+			goto tx_error;
+		}
+	}
+#endif
+
+	if (tunnel->err_count > 0) {
+		if (time_before(jiffies,
+				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
+			tunnel->err_count--;
+
+			dst_link_failure(skb);
+		} else
+			tunnel->err_count = 0;
+	}
+
+	ttl = tnl_params->ttl;
+	if (ttl == 0) {
+		if (skb->protocol == htons(ETH_P_IP))
+			ttl = inner_iph->ttl;
+#if IS_ENABLED(CONFIG_IPV6)
+		else if (skb->protocol == htons(ETH_P_IPV6))
+			ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
+#endif
+		else
+			ttl = ip4_dst_hoplimit(&rt->dst);
+	}
+
+	max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
+					       + rt->dst.header_len;
+	if (max_headroom > dev->needed_headroom) {
+		dev->needed_headroom = max_headroom;
+		if (skb_cow_head(skb, dev->needed_headroom)) {
+			dev->stats.tx_dropped++;
+			dev_kfree_skb(skb);
+			return;
+		}
+	}
+
+	skb_dst_drop(skb);
+	skb_dst_set(skb, &rt->dst);
+
+	/* Push down and install the IP header. */
+	skb_push(skb, sizeof(struct iphdr));
+	skb_reset_network_header(skb);
+
+	iph = ip_hdr(skb);
+	inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
+
+	iph->version	=	4;
+	iph->ihl	=	sizeof(struct iphdr) >> 2;
+	iph->frag_off	=	df;
+	iph->protocol	=	tnl_params->protocol;
+	iph->tos	=	ip_tunnel_ecn_encap(tos, inner_iph, skb);
+	iph->daddr	=	fl4.daddr;
+	iph->saddr	=	fl4.saddr;
+	iph->ttl	=	ttl;
+	tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
+
+	iptunnel_xmit(skb, dev);
+	return;
+
+#if IS_ENABLED(CONFIG_IPV6)
+tx_error_icmp:
+	dst_link_failure(skb);
+#endif
+tx_error:
+	dev->stats.tx_errors++;
+	dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
+
+static void ip_tunnel_update(struct ip_tunnel_net *itn,
+			     struct ip_tunnel *t,
+			     struct net_device *dev,
+			     struct ip_tunnel_parm *p,
+			     bool set_mtu)
+{
+	ip_tunnel_del(t);
+	t->parms.iph.saddr = p->iph.saddr;
+	t->parms.iph.daddr = p->iph.daddr;
+	t->parms.i_key = p->i_key;
+	t->parms.o_key = p->o_key;
+	if (dev->type != ARPHRD_ETHER) {
+		memcpy(dev->dev_addr, &p->iph.saddr, 4);
+		memcpy(dev->broadcast, &p->iph.daddr, 4);
+	}
+	ip_tunnel_add(itn, t);
+
+	t->parms.iph.ttl = p->iph.ttl;
+	t->parms.iph.tos = p->iph.tos;
+	t->parms.iph.frag_off = p->iph.frag_off;
+
+	if (t->parms.link != p->link) {
+		int mtu;
+
+		t->parms.link = p->link;
+		mtu = ip_tunnel_bind_dev(dev);
+		if (set_mtu)
+			dev->mtu = mtu;
+	}
+	netdev_state_change(dev);
+}
+
+int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+{
+	int err = 0;
+	struct ip_tunnel *t;
+	struct net *net = dev_net(dev);
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+	BUG_ON(!itn->fb_tunnel_dev);
+	switch (cmd) {
+	case SIOCGETTUNNEL:
+		t = NULL;
+		if (dev == itn->fb_tunnel_dev)
+			t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+		if (t == NULL)
+			t = netdev_priv(dev);
+		memcpy(p, &t->parms, sizeof(*p));
+		break;
+
+	case SIOCADDTUNNEL:
+	case SIOCCHGTUNNEL:
+		err = -EPERM;
+		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+			goto done;
+		if (p->iph.ttl)
+			p->iph.frag_off |= htons(IP_DF);
+		if (!(p->i_flags&TUNNEL_KEY))
+			p->i_key = 0;
+		if (!(p->o_flags&TUNNEL_KEY))
+			p->o_key = 0;
+
+		t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+
+		if (!t && (cmd == SIOCADDTUNNEL))
+			t = ip_tunnel_create(net, itn, p);
+
+		if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+			if (t != NULL) {
+				if (t->dev != dev) {
+					err = -EEXIST;
+					break;
+				}
+			} else {
+				unsigned int nflags = 0;
+
+				if (ipv4_is_multicast(p->iph.daddr))
+					nflags = IFF_BROADCAST;
+				else if (p->iph.daddr)
+					nflags = IFF_POINTOPOINT;
+
+				if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
+					err = -EINVAL;
+					break;
+				}
+
+				t = netdev_priv(dev);
+			}
+		}
+
+		if (t) {
+			err = 0;
+			ip_tunnel_update(itn, t, dev, p, true);
+		} else
+			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+		break;
+
+	case SIOCDELTUNNEL:
+		err = -EPERM;
+		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+			goto done;
+
+		if (dev == itn->fb_tunnel_dev) {
+			err = -ENOENT;
+			t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+			if (t == NULL)
+				goto done;
+			err = -EPERM;
+			if (t == netdev_priv(itn->fb_tunnel_dev))
+				goto done;
+			dev = t->dev;
+		}
+		unregister_netdevice(dev);
+		err = 0;
+		break;
+
+	default:
+		err = -EINVAL;
+	}
+
+done:
+	return err;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
+
+int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+	if (new_mtu < 68 ||
+	    new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
+
+static void ip_tunnel_dev_free(struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+
+	gro_cells_destroy(&tunnel->gro_cells);
+	free_percpu(dev->tstats);
+	free_netdev(dev);
+}
+
+void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
+{
+	struct net *net = dev_net(dev);
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct ip_tunnel_net *itn;
+
+	itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+	if (itn->fb_tunnel_dev != dev) {
+		ip_tunnel_del(netdev_priv(dev));
+		unregister_netdevice_queue(dev, head);
+	}
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
+
+int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
+				  struct rtnl_link_ops *ops, char *devname)
+{
+	struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
+	struct ip_tunnel_parm parms;
+
+	itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL);
+	if (!itn->tunnels)
+		return -ENOMEM;
+
+	if (!ops) {
+		itn->fb_tunnel_dev = NULL;
+		return 0;
+	}
+	memset(&parms, 0, sizeof(parms));
+	if (devname)
+		strlcpy(parms.name, devname, IFNAMSIZ);
+
+	rtnl_lock();
+	itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
+	rtnl_unlock();
+	if (IS_ERR(itn->fb_tunnel_dev)) {
+		kfree(itn->tunnels);
+		return PTR_ERR(itn->fb_tunnel_dev);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
+
+static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
+{
+	int h;
+
+	for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
+		struct ip_tunnel *t;
+		struct hlist_node *n;
+		struct hlist_head *thead = &itn->tunnels[h];
+
+		hlist_for_each_entry_safe(t, n, thead, hash_node)
+			unregister_netdevice_queue(t->dev, head);
+	}
+	if (itn->fb_tunnel_dev)
+		unregister_netdevice_queue(itn->fb_tunnel_dev, head);
+}
+
+void ip_tunnel_delete_net(struct ip_tunnel_net *itn)
+{
+	LIST_HEAD(list);
+
+	rtnl_lock();
+	ip_tunnel_destroy(itn, &list);
+	unregister_netdevice_many(&list);
+	rtnl_unlock();
+	kfree(itn->tunnels);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
+
+int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
+		      struct ip_tunnel_parm *p)
+{
+	struct ip_tunnel *nt;
+	struct net *net = dev_net(dev);
+	struct ip_tunnel_net *itn;
+	int mtu;
+	int err;
+
+	nt = netdev_priv(dev);
+	itn = net_generic(net, nt->ip_tnl_net_id);
+
+	if (ip_tunnel_find(itn, p, dev->type))
+		return -EEXIST;
+
+	nt->parms = *p;
+	err = register_netdevice(dev);
+	if (err)
+		goto out;
+
+	if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
+		eth_hw_addr_random(dev);
+
+	mtu = ip_tunnel_bind_dev(dev);
+	if (!tb[IFLA_MTU])
+		dev->mtu = mtu;
+
+	ip_tunnel_add(itn, nt);
+
+out:
+	return err;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
+
+int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
+			 struct ip_tunnel_parm *p)
+{
+	struct ip_tunnel *t, *nt;
+	struct net *net = dev_net(dev);
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+	if (dev == itn->fb_tunnel_dev)
+		return -EINVAL;
+
+	nt = netdev_priv(dev);
+
+	t = ip_tunnel_find(itn, p, dev->type);
+
+	if (t) {
+		if (t->dev != dev)
+			return -EEXIST;
+	} else {
+		t = nt;
+
+		if (dev->type != ARPHRD_ETHER) {
+			unsigned int nflags = 0;
+
+			if (ipv4_is_multicast(p->iph.daddr))
+				nflags = IFF_BROADCAST;
+			else if (p->iph.daddr)
+				nflags = IFF_POINTOPOINT;
+
+			if ((dev->flags ^ nflags) &
+			    (IFF_POINTOPOINT | IFF_BROADCAST))
+				return -EINVAL;
+		}
+	}
+
+	ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
+
+int ip_tunnel_init(struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct iphdr *iph = &tunnel->parms.iph;
+	int err;
+
+	dev->destructor	= ip_tunnel_dev_free;
+	dev->tstats = alloc_percpu(struct pcpu_tstats);
+	if (!dev->tstats)
+		return -ENOMEM;
+
+	err = gro_cells_init(&tunnel->gro_cells, dev);
+	if (err) {
+		free_percpu(dev->tstats);
+		return err;
+	}
+
+	tunnel->dev = dev;
+	strcpy(tunnel->parms.name, dev->name);
+	iph->version		= 4;
+	iph->ihl		= 5;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_init);
+
+void ip_tunnel_uninit(struct net_device *dev)
+{
+	struct net *net = dev_net(dev);
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct ip_tunnel_net *itn;
+
+	itn = net_generic(net, tunnel->ip_tnl_net_id);
+	/* fb_tunnel_dev will be unregisted in net-exit call. */
+	if (itn->fb_tunnel_dev != dev)
+		ip_tunnel_del(netdev_priv(dev));
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
+
+/* Do least required initialization, rest of init is done in tunnel_init call */
+void ip_tunnel_setup(struct net_device *dev, int net_id)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	tunnel->ip_tnl_net_id = net_id;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_setup);
+
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index c3a4233..c118f6b 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -38,7 +38,7 @@
 #include <net/sock.h>
 #include <net/ip.h>
 #include <net/icmp.h>
-#include <net/ipip.h>
+#include <net/ip_tunnels.h>
 #include <net/inet_ecn.h>
 #include <net/xfrm.h>
 #include <net/net_namespace.h>
@@ -82,44 +82,6 @@ static int vti_tunnel_bind_dev(struct net_device *dev);
 } while (0)
 
 
-static struct rtnl_link_stats64 *vti_get_stats64(struct net_device *dev,
-						 struct rtnl_link_stats64 *tot)
-{
-	int i;
-
-	for_each_possible_cpu(i) {
-		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
-
-		do {
-			start = u64_stats_fetch_begin_bh(&tstats->syncp);
-			rx_packets = tstats->rx_packets;
-			tx_packets = tstats->tx_packets;
-			rx_bytes = tstats->rx_bytes;
-			tx_bytes = tstats->tx_bytes;
-		} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
-
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
-	}
-
-	tot->multicast = dev->stats.multicast;
-	tot->rx_crc_errors = dev->stats.rx_crc_errors;
-	tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
-	tot->rx_length_errors = dev->stats.rx_length_errors;
-	tot->rx_errors = dev->stats.rx_errors;
-	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
-	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
-	tot->tx_dropped = dev->stats.tx_dropped;
-	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
-	tot->tx_errors = dev->stats.tx_errors;
-
-	return tot;
-}
-
 static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
 					   __be32 remote, __be32 local)
 {
@@ -399,8 +361,7 @@ static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 			tunnel->err_count = 0;
 	}
 
-	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
-			      IPSKB_REROUTED);
+	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 	skb_dst_drop(skb);
 	skb_dst_set(skb, &rt->dst);
 	nf_reset(skb);
@@ -597,7 +558,7 @@ static const struct net_device_ops vti_netdev_ops = {
 	.ndo_start_xmit	= vti_tunnel_xmit,
 	.ndo_do_ioctl	= vti_tunnel_ioctl,
 	.ndo_change_mtu	= vti_tunnel_change_mtu,
-	.ndo_get_stats64 = vti_get_stats64,
+	.ndo_get_stats64 = ip_tunnel_get_stats64,
 };
 
 static void vti_dev_free(struct net_device *dev)
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 9a46dae..59cb8c7 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -75,6 +75,7 @@ static struct xfrm_state *ipcomp_tunnel_create(struct xfrm_state *x)
 	t->props.mode = x->props.mode;
 	t->props.saddr.a4 = x->props.saddr.a4;
 	t->props.flags = x->props.flags;
+	t->props.extra_flags = x->props.extra_flags;
 	memcpy(&t->mark, &x->mark, sizeof(t->mark));
 
 	if (xfrm_init_state(t))
@@ -163,6 +164,7 @@ static const struct net_protocol ipcomp4_protocol = {
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	ipcomp4_err,
 	.no_policy	=	1,
+	.netns_ok	=	1,
 };
 
 static int __init ipcomp4_init(void)
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index a2e50ae..efa1138 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -206,7 +206,7 @@ static int __init ic_open_devs(void)
 	struct ic_device *d, **last;
 	struct net_device *dev;
 	unsigned short oflags;
-	unsigned long start;
+	unsigned long start, next_msg;
 
 	last = &ic_first_dev;
 	rtnl_lock();
@@ -263,12 +263,23 @@ static int __init ic_open_devs(void)
 
 	/* wait for a carrier on at least one device */
 	start = jiffies;
+	next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 	while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
+		int wait, elapsed;
+
 		for_each_netdev(&init_net, dev)
 			if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 				goto have_carrier;
 
 		msleep(1);
+
+		if time_before(jiffies, next_msg)
+			continue;
+
+		elapsed = jiffies_to_msecs(jiffies - start);
+		wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
+		pr_info("Waiting up to %d more seconds for network.\n", wait);
+		next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 	}
 have_carrier:
 	rtnl_unlock();
@@ -1394,7 +1405,7 @@ static int __init ip_auto_config(void)
 	unsigned int i;
 
 #ifdef CONFIG_PROC_FS
-	proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
+	proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
 #endif /* CONFIG_PROC_FS */
 
 	if (!ic_enable)
@@ -1522,7 +1533,8 @@ static int __init ip_auto_config(void)
 		}
 	for (i++; i < CONF_NAMESERVERS_MAX; i++)
 		if (ic_nameservers[i] != NONE)
-			pr_cont(", nameserver%u=%pI4\n", i, &ic_nameservers[i]);
+			pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
+	pr_cont("\n");
 #endif /* !SILENT */
 
 	return 0;
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 191fc24..77bfcce 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -111,227 +111,21 @@
 #include <net/sock.h>
 #include <net/ip.h>
 #include <net/icmp.h>
-#include <net/ipip.h>
+#include <net/ip_tunnels.h>
 #include <net/inet_ecn.h>
 #include <net/xfrm.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 
-#define HASH_SIZE  16
-#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
-
 static bool log_ecn_error = true;
 module_param(log_ecn_error, bool, 0644);
 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 
 static int ipip_net_id __read_mostly;
-struct ipip_net {
-	struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
-	struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
-	struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
-	struct ip_tunnel __rcu *tunnels_wc[1];
-	struct ip_tunnel __rcu **tunnels[4];
-
-	struct net_device *fb_tunnel_dev;
-};
 
 static int ipip_tunnel_init(struct net_device *dev);
-static void ipip_tunnel_setup(struct net_device *dev);
-static void ipip_dev_free(struct net_device *dev);
 static struct rtnl_link_ops ipip_link_ops __read_mostly;
 
-static struct rtnl_link_stats64 *ipip_get_stats64(struct net_device *dev,
-						  struct rtnl_link_stats64 *tot)
-{
-	int i;
-
-	for_each_possible_cpu(i) {
-		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
-		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
-		unsigned int start;
-
-		do {
-			start = u64_stats_fetch_begin_bh(&tstats->syncp);
-			rx_packets = tstats->rx_packets;
-			tx_packets = tstats->tx_packets;
-			rx_bytes = tstats->rx_bytes;
-			tx_bytes = tstats->tx_bytes;
-		} while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
-
-		tot->rx_packets += rx_packets;
-		tot->tx_packets += tx_packets;
-		tot->rx_bytes   += rx_bytes;
-		tot->tx_bytes   += tx_bytes;
-	}
-
-	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
-	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
-	tot->tx_dropped = dev->stats.tx_dropped;
-	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
-	tot->tx_errors = dev->stats.tx_errors;
-	tot->collisions = dev->stats.collisions;
-
-	return tot;
-}
-
-static struct ip_tunnel *ipip_tunnel_lookup(struct net *net,
-		__be32 remote, __be32 local)
-{
-	unsigned int h0 = HASH(remote);
-	unsigned int h1 = HASH(local);
-	struct ip_tunnel *t;
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	for_each_ip_tunnel_rcu(t, ipn->tunnels_r_l[h0 ^ h1])
-		if (local == t->parms.iph.saddr &&
-		    remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
-			return t;
-
-	for_each_ip_tunnel_rcu(t, ipn->tunnels_r[h0])
-		if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
-			return t;
-
-	for_each_ip_tunnel_rcu(t, ipn->tunnels_l[h1])
-		if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
-			return t;
-
-	t = rcu_dereference(ipn->tunnels_wc[0]);
-	if (t && (t->dev->flags&IFF_UP))
-		return t;
-	return NULL;
-}
-
-static struct ip_tunnel __rcu **__ipip_bucket(struct ipip_net *ipn,
-		struct ip_tunnel_parm *parms)
-{
-	__be32 remote = parms->iph.daddr;
-	__be32 local = parms->iph.saddr;
-	unsigned int h = 0;
-	int prio = 0;
-
-	if (remote) {
-		prio |= 2;
-		h ^= HASH(remote);
-	}
-	if (local) {
-		prio |= 1;
-		h ^= HASH(local);
-	}
-	return &ipn->tunnels[prio][h];
-}
-
-static inline struct ip_tunnel __rcu **ipip_bucket(struct ipip_net *ipn,
-		struct ip_tunnel *t)
-{
-	return __ipip_bucket(ipn, &t->parms);
-}
-
-static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t)
-{
-	struct ip_tunnel __rcu **tp;
-	struct ip_tunnel *iter;
-
-	for (tp = ipip_bucket(ipn, t);
-	     (iter = rtnl_dereference(*tp)) != NULL;
-	     tp = &iter->next) {
-		if (t == iter) {
-			rcu_assign_pointer(*tp, t->next);
-			break;
-		}
-	}
-}
-
-static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t)
-{
-	struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t);
-
-	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
-	rcu_assign_pointer(*tp, t);
-}
-
-static int ipip_tunnel_create(struct net_device *dev)
-{
-	struct ip_tunnel *t = netdev_priv(dev);
-	struct net *net = dev_net(dev);
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-	int err;
-
-	err = ipip_tunnel_init(dev);
-	if (err < 0)
-		goto out;
-
-	err = register_netdevice(dev);
-	if (err < 0)
-		goto out;
-
-	strcpy(t->parms.name, dev->name);
-	dev->rtnl_link_ops = &ipip_link_ops;
-
-	dev_hold(dev);
-	ipip_tunnel_link(ipn, t);
-	return 0;
-
-out:
-	return err;
-}
-
-static struct ip_tunnel *ipip_tunnel_locate(struct net *net,
-		struct ip_tunnel_parm *parms, int create)
-{
-	__be32 remote = parms->iph.daddr;
-	__be32 local = parms->iph.saddr;
-	struct ip_tunnel *t, *nt;
-	struct ip_tunnel __rcu **tp;
-	struct net_device *dev;
-	char name[IFNAMSIZ];
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	for (tp = __ipip_bucket(ipn, parms);
-		 (t = rtnl_dereference(*tp)) != NULL;
-		 tp = &t->next) {
-		if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
-			return t;
-	}
-	if (!create)
-		return NULL;
-
-	if (parms->name[0])
-		strlcpy(name, parms->name, IFNAMSIZ);
-	else
-		strcpy(name, "tunl%d");
-
-	dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
-	if (dev == NULL)
-		return NULL;
-
-	dev_net_set(dev, net);
-
-	nt = netdev_priv(dev);
-	nt->parms = *parms;
-
-	if (ipip_tunnel_create(dev) < 0)
-		goto failed_free;
-
-	return nt;
-
-failed_free:
-	ipip_dev_free(dev);
-	return NULL;
-}
-
-/* called with RTNL */
-static void ipip_tunnel_uninit(struct net_device *dev)
-{
-	struct net *net = dev_net(dev);
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	if (dev == ipn->fb_tunnel_dev)
-		RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL);
-	else
-		ipip_tunnel_unlink(ipn, netdev_priv(dev));
-	dev_put(dev);
-}
-
 static int ipip_err(struct sk_buff *skb, u32 info)
 {
 
@@ -339,41 +133,17 @@ static int ipip_err(struct sk_buff *skb, u32 info)
    8 bytes of packet payload. It means, that precise relaying of
    ICMP in the real Internet is absolutely infeasible.
  */
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 	const struct iphdr *iph = (const struct iphdr *)skb->data;
-	const int type = icmp_hdr(skb)->type;
-	const int code = icmp_hdr(skb)->code;
 	struct ip_tunnel *t;
 	int err;
-
-	switch (type) {
-	default:
-	case ICMP_PARAMETERPROB:
-		return 0;
-
-	case ICMP_DEST_UNREACH:
-		switch (code) {
-		case ICMP_SR_FAILED:
-		case ICMP_PORT_UNREACH:
-			/* Impossible event. */
-			return 0;
-		default:
-			/* All others are translated to HOST_UNREACH.
-			   rfc2003 contains "deep thoughts" about NET_UNREACH,
-			   I believe they are just ether pollution. --ANK
-			 */
-			break;
-		}
-		break;
-	case ICMP_TIME_EXCEEDED:
-		if (code != ICMP_EXC_TTL)
-			return 0;
-		break;
-	case ICMP_REDIRECT:
-		break;
-	}
+	const int type = icmp_hdr(skb)->type;
+	const int code = icmp_hdr(skb)->code;
 
 	err = -ENOENT;
-	t = ipip_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
+	t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+			     iph->daddr, iph->saddr, 0);
 	if (t == NULL)
 		goto out;
 
@@ -403,53 +173,29 @@ static int ipip_err(struct sk_buff *skb, u32 info)
 	else
 		t->err_count = 1;
 	t->err_time = jiffies;
-out:
 
+out:
 	return err;
 }
 
+static const struct tnl_ptk_info tpi = {
+	/* no tunnel info required for ipip. */
+	.proto = htons(ETH_P_IP),
+};
+
 static int ipip_rcv(struct sk_buff *skb)
 {
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
 	struct ip_tunnel *tunnel;
 	const struct iphdr *iph = ip_hdr(skb);
-	int err;
-
-	tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
-	if (tunnel != NULL) {
-		struct pcpu_tstats *tstats;
 
+	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+			iph->saddr, iph->daddr, 0);
+	if (tunnel) {
 		if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 			goto drop;
-
-		secpath_reset(skb);
-
-		skb->mac_header = skb->network_header;
-		skb_reset_network_header(skb);
-		skb->protocol = htons(ETH_P_IP);
-		skb->pkt_type = PACKET_HOST;
-
-		__skb_tunnel_rx(skb, tunnel->dev);
-
-		err = IP_ECN_decapsulate(iph, skb);
-		if (unlikely(err)) {
-			if (log_ecn_error)
-				net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
-						     &iph->saddr, iph->tos);
-			if (err > 1) {
-				++tunnel->dev->stats.rx_frame_errors;
-				++tunnel->dev->stats.rx_errors;
-				goto drop;
-			}
-		}
-
-		tstats = this_cpu_ptr(tunnel->dev->tstats);
-		u64_stats_update_begin(&tstats->syncp);
-		tstats->rx_packets++;
-		tstats->rx_bytes += skb->len;
-		u64_stats_update_end(&tstats->syncp);
-
-		netif_rx(skb);
-		return 0;
+		return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
 	}
 
 	return -1;
@@ -463,327 +209,64 @@ drop:
  *	This function assumes it is being called from dev_queue_xmit()
  *	and that skb is filled properly by that function.
  */
-
 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 	const struct iphdr  *tiph = &tunnel->parms.iph;
-	u8     tos = tunnel->parms.iph.tos;
-	__be16 df = tiph->frag_off;
-	struct rtable *rt;     			/* Route to the other host */
-	struct net_device *tdev;		/* Device to other host */
-	const struct iphdr  *old_iph = ip_hdr(skb);
-	struct iphdr  *iph;			/* Our new IP header */
-	unsigned int max_headroom;		/* The extra header space needed */
-	__be32 dst = tiph->daddr;
-	struct flowi4 fl4;
-	int    mtu;
-
-	if (skb->protocol != htons(ETH_P_IP))
-		goto tx_error;
-
-	if (skb->ip_summed == CHECKSUM_PARTIAL &&
-	    skb_checksum_help(skb))
-		goto tx_error;
 
-	if (tos & 1)
-		tos = old_iph->tos;
-
-	if (!dst) {
-		/* NBMA tunnel */
-		if ((rt = skb_rtable(skb)) == NULL) {
-			dev->stats.tx_fifo_errors++;
-			goto tx_error;
-		}
-		dst = rt_nexthop(rt, old_iph->daddr);
-	}
-
-	rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
-				   dst, tiph->saddr,
-				   0, 0,
-				   IPPROTO_IPIP, RT_TOS(tos),
-				   tunnel->parms.link);
-	if (IS_ERR(rt)) {
-		dev->stats.tx_carrier_errors++;
-		goto tx_error_icmp;
-	}
-	tdev = rt->dst.dev;
-
-	if (tdev == dev) {
-		ip_rt_put(rt);
-		dev->stats.collisions++;
+	if (unlikely(skb->protocol != htons(ETH_P_IP)))
 		goto tx_error;
-	}
 
-	df |= old_iph->frag_off & htons(IP_DF);
-
-	if (df) {
-		mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
-
-		if (mtu < 68) {
-			dev->stats.collisions++;
-			ip_rt_put(rt);
-			goto tx_error;
-		}
-
-		if (skb_dst(skb))
-			skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
-
-		if ((old_iph->frag_off & htons(IP_DF)) &&
-		    mtu < ntohs(old_iph->tot_len)) {
-			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
-				  htonl(mtu));
-			ip_rt_put(rt);
-			goto tx_error;
-		}
+	if (likely(!skb->encapsulation)) {
+		skb_reset_inner_headers(skb);
+		skb->encapsulation = 1;
 	}
 
-	if (tunnel->err_count > 0) {
-		if (time_before(jiffies,
-				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
-			tunnel->err_count--;
-			dst_link_failure(skb);
-		} else
-			tunnel->err_count = 0;
-	}
-
-	/*
-	 * Okay, now see if we can stuff it in the buffer as-is.
-	 */
-	max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr));
-
-	if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
-	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
-		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
-		if (!new_skb) {
-			ip_rt_put(rt);
-			dev->stats.tx_dropped++;
-			dev_kfree_skb(skb);
-			return NETDEV_TX_OK;
-		}
-		if (skb->sk)
-			skb_set_owner_w(new_skb, skb->sk);
-		dev_kfree_skb(skb);
-		skb = new_skb;
-		old_iph = ip_hdr(skb);
-	}
-
-	skb->transport_header = skb->network_header;
-	skb_push(skb, sizeof(struct iphdr));
-	skb_reset_network_header(skb);
-	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
-			      IPSKB_REROUTED);
-	skb_dst_drop(skb);
-	skb_dst_set(skb, &rt->dst);
-
-	/*
-	 *	Push down and install the IPIP header.
-	 */
-
-	iph 			=	ip_hdr(skb);
-	iph->version		=	4;
-	iph->ihl		=	sizeof(struct iphdr)>>2;
-	iph->frag_off		=	df;
-	iph->protocol		=	IPPROTO_IPIP;
-	iph->tos		=	INET_ECN_encapsulate(tos, old_iph->tos);
-	iph->daddr		=	fl4.daddr;
-	iph->saddr		=	fl4.saddr;
-
-	if ((iph->ttl = tiph->ttl) == 0)
-		iph->ttl	=	old_iph->ttl;
-
-	iptunnel_xmit(skb, dev);
+	ip_tunnel_xmit(skb, dev, tiph);
 	return NETDEV_TX_OK;
 
-tx_error_icmp:
-	dst_link_failure(skb);
 tx_error:
 	dev->stats.tx_errors++;
 	dev_kfree_skb(skb);
 	return NETDEV_TX_OK;
 }
 
-static void ipip_tunnel_bind_dev(struct net_device *dev)
-{
-	struct net_device *tdev = NULL;
-	struct ip_tunnel *tunnel;
-	const struct iphdr *iph;
-
-	tunnel = netdev_priv(dev);
-	iph = &tunnel->parms.iph;
-
-	if (iph->daddr) {
-		struct rtable *rt;
-		struct flowi4 fl4;
-
-		rt = ip_route_output_ports(dev_net(dev), &fl4, NULL,
-					   iph->daddr, iph->saddr,
-					   0, 0,
-					   IPPROTO_IPIP,
-					   RT_TOS(iph->tos),
-					   tunnel->parms.link);
-		if (!IS_ERR(rt)) {
-			tdev = rt->dst.dev;
-			ip_rt_put(rt);
-		}
-		dev->flags |= IFF_POINTOPOINT;
-	}
-
-	if (!tdev && tunnel->parms.link)
-		tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
-
-	if (tdev) {
-		dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
-		dev->mtu = tdev->mtu - sizeof(struct iphdr);
-	}
-	dev->iflink = tunnel->parms.link;
-}
-
-static void ipip_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)
-{
-	struct net *net = dev_net(t->dev);
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	ipip_tunnel_unlink(ipn, t);
-	synchronize_net();
-	t->parms.iph.saddr = p->iph.saddr;
-	t->parms.iph.daddr = p->iph.daddr;
-	memcpy(t->dev->dev_addr, &p->iph.saddr, 4);
-	memcpy(t->dev->broadcast, &p->iph.daddr, 4);
-	ipip_tunnel_link(ipn, t);
-	t->parms.iph.ttl = p->iph.ttl;
-	t->parms.iph.tos = p->iph.tos;
-	t->parms.iph.frag_off = p->iph.frag_off;
-	if (t->parms.link != p->link) {
-		t->parms.link = p->link;
-		ipip_tunnel_bind_dev(t->dev);
-	}
-	netdev_state_change(t->dev);
-}
-
 static int
-ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
+ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 {
 	int err = 0;
 	struct ip_tunnel_parm p;
-	struct ip_tunnel *t;
-	struct net *net = dev_net(dev);
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	switch (cmd) {
-	case SIOCGETTUNNEL:
-		t = NULL;
-		if (dev == ipn->fb_tunnel_dev) {
-			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
-				err = -EFAULT;
-				break;
-			}
-			t = ipip_tunnel_locate(net, &p, 0);
-		}
-		if (t == NULL)
-			t = netdev_priv(dev);
-		memcpy(&p, &t->parms, sizeof(p));
-		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
-			err = -EFAULT;
-		break;
-
-	case SIOCADDTUNNEL:
-	case SIOCCHGTUNNEL:
-		err = -EPERM;
-		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
-			goto done;
-
-		err = -EFAULT;
-		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-			goto done;
-
-		err = -EINVAL;
-		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
-		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
-			goto done;
-		if (p.iph.ttl)
-			p.iph.frag_off |= htons(IP_DF);
-
-		t = ipip_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
-
-		if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
-			if (t != NULL) {
-				if (t->dev != dev) {
-					err = -EEXIST;
-					break;
-				}
-			} else {
-				if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
-				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
-					err = -EINVAL;
-					break;
-				}
-				t = netdev_priv(dev);
-			}
-
-			ipip_tunnel_update(t, &p);
-		}
-
-		if (t) {
-			err = 0;
-			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
-				err = -EFAULT;
-		} else
-			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
-		break;
-
-	case SIOCDELTUNNEL:
-		err = -EPERM;
-		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
-			goto done;
-
-		if (dev == ipn->fb_tunnel_dev) {
-			err = -EFAULT;
-			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
-				goto done;
-			err = -ENOENT;
-			if ((t = ipip_tunnel_locate(net, &p, 0)) == NULL)
-				goto done;
-			err = -EPERM;
-			if (t->dev == ipn->fb_tunnel_dev)
-				goto done;
-			dev = t->dev;
-		}
-		unregister_netdevice(dev);
-		err = 0;
-		break;
 
-	default:
-		err = -EINVAL;
-	}
-
-done:
-	return err;
-}
+	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+		return -EFAULT;
 
-static int ipip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < 68 || new_mtu > 0xFFF8 - sizeof(struct iphdr))
+	if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
+			p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
+		return -EINVAL;
+	if (p.i_key || p.o_key || p.i_flags || p.o_flags)
 		return -EINVAL;
-	dev->mtu = new_mtu;
+	if (p.iph.ttl)
+		p.iph.frag_off |= htons(IP_DF);
+
+	err = ip_tunnel_ioctl(dev, &p, cmd);
+	if (err)
+		return err;
+
+	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+		return -EFAULT;
+
 	return 0;
 }
 
 static const struct net_device_ops ipip_netdev_ops = {
-	.ndo_uninit	= ipip_tunnel_uninit,
+	.ndo_init       = ipip_tunnel_init,
+	.ndo_uninit     = ip_tunnel_uninit,
 	.ndo_start_xmit	= ipip_tunnel_xmit,
 	.ndo_do_ioctl	= ipip_tunnel_ioctl,
-	.ndo_change_mtu	= ipip_tunnel_change_mtu,
-	.ndo_get_stats64 = ipip_get_stats64,
+	.ndo_change_mtu = ip_tunnel_change_mtu,
+	.ndo_get_stats64 = ip_tunnel_get_stats64,
 };
 
-static void ipip_dev_free(struct net_device *dev)
-{
-	free_percpu(dev->tstats);
-	free_netdev(dev);
-}
-
 #define IPIP_FEATURES (NETIF_F_SG |		\
 		       NETIF_F_FRAGLIST |	\
 		       NETIF_F_HIGHDMA |	\
@@ -792,11 +275,8 @@ static void ipip_dev_free(struct net_device *dev)
 static void ipip_tunnel_setup(struct net_device *dev)
 {
 	dev->netdev_ops		= &ipip_netdev_ops;
-	dev->destructor		= ipip_dev_free;
 
 	dev->type		= ARPHRD_TUNNEL;
-	dev->hard_header_len 	= LL_MAX_HEADER + sizeof(struct iphdr);
-	dev->mtu		= ETH_DATA_LEN - sizeof(struct iphdr);
 	dev->flags		= IFF_NOARP;
 	dev->iflink		= 0;
 	dev->addr_len		= 4;
@@ -806,46 +286,19 @@ static void ipip_tunnel_setup(struct net_device *dev)
 
 	dev->features		|= IPIP_FEATURES;
 	dev->hw_features	|= IPIP_FEATURES;
+	ip_tunnel_setup(dev, ipip_net_id);
 }
 
 static int ipip_tunnel_init(struct net_device *dev)
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 
-	tunnel->dev = dev;
-
 	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
 	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
 
-	ipip_tunnel_bind_dev(dev);
-
-	dev->tstats = alloc_percpu(struct pcpu_tstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
-	return 0;
-}
-
-static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
-{
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-	struct iphdr *iph = &tunnel->parms.iph;
-	struct ipip_net *ipn = net_generic(dev_net(dev), ipip_net_id);
-
-	tunnel->dev = dev;
-	strcpy(tunnel->parms.name, dev->name);
-
-	iph->version		= 4;
-	iph->protocol		= IPPROTO_IPIP;
-	iph->ihl		= 5;
-
-	dev->tstats = alloc_percpu(struct pcpu_tstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
-	dev_hold(dev);
-	rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
-	return 0;
+	tunnel->hlen = 0;
+	tunnel->parms.iph.protocol = IPPROTO_IPIP;
+	return ip_tunnel_init(dev);
 }
 
 static void ipip_netlink_parms(struct nlattr *data[],
@@ -885,28 +338,16 @@ static void ipip_netlink_parms(struct nlattr *data[],
 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 			struct nlattr *tb[], struct nlattr *data[])
 {
-	struct net *net = dev_net(dev);
-	struct ip_tunnel *nt;
-
-	nt = netdev_priv(dev);
-	ipip_netlink_parms(data, &nt->parms);
-
-	if (ipip_tunnel_locate(net, &nt->parms, 0))
-		return -EEXIST;
+	struct ip_tunnel_parm p;
 
-	return ipip_tunnel_create(dev);
+	ipip_netlink_parms(data, &p);
+	return ip_tunnel_newlink(dev, tb, &p);
 }
 
 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 			   struct nlattr *data[])
 {
-	struct ip_tunnel *t;
 	struct ip_tunnel_parm p;
-	struct net *net = dev_net(dev);
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-
-	if (dev == ipn->fb_tunnel_dev)
-		return -EINVAL;
 
 	ipip_netlink_parms(data, &p);
 
@@ -914,16 +355,7 @@ static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 	    (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
 		return -EINVAL;
 
-	t = ipip_tunnel_locate(net, &p, 0);
-
-	if (t) {
-		if (t->dev != dev)
-			return -EEXIST;
-	} else
-		t = netdev_priv(dev);
-
-	ipip_tunnel_update(t, &p);
-	return 0;
+	return ip_tunnel_changelink(dev, tb, &p);
 }
 
 static size_t ipip_get_size(const struct net_device *dev)
@@ -980,6 +412,7 @@ static struct rtnl_link_ops ipip_link_ops __read_mostly = {
 	.setup		= ipip_tunnel_setup,
 	.newlink	= ipip_newlink,
 	.changelink	= ipip_changelink,
+	.dellink	= ip_tunnel_dellink,
 	.get_size	= ipip_get_size,
 	.fill_info	= ipip_fill_info,
 };
@@ -990,90 +423,29 @@ static struct xfrm_tunnel ipip_handler __read_mostly = {
 	.priority	=	1,
 };
 
-static const char banner[] __initconst =
-	KERN_INFO "IPv4 over IPv4 tunneling driver\n";
-
-static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head)
-{
-	int prio;
-
-	for (prio = 1; prio < 4; prio++) {
-		int h;
-		for (h = 0; h < HASH_SIZE; h++) {
-			struct ip_tunnel *t;
-
-			t = rtnl_dereference(ipn->tunnels[prio][h]);
-			while (t != NULL) {
-				unregister_netdevice_queue(t->dev, head);
-				t = rtnl_dereference(t->next);
-			}
-		}
-	}
-}
-
 static int __net_init ipip_init_net(struct net *net)
 {
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-	struct ip_tunnel *t;
-	int err;
-
-	ipn->tunnels[0] = ipn->tunnels_wc;
-	ipn->tunnels[1] = ipn->tunnels_l;
-	ipn->tunnels[2] = ipn->tunnels_r;
-	ipn->tunnels[3] = ipn->tunnels_r_l;
-
-	ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
-					   "tunl0",
-					   ipip_tunnel_setup);
-	if (!ipn->fb_tunnel_dev) {
-		err = -ENOMEM;
-		goto err_alloc_dev;
-	}
-	dev_net_set(ipn->fb_tunnel_dev, net);
-
-	err = ipip_fb_tunnel_init(ipn->fb_tunnel_dev);
-	if (err)
-		goto err_reg_dev;
-
-	if ((err = register_netdev(ipn->fb_tunnel_dev)))
-		goto err_reg_dev;
-
-	t = netdev_priv(ipn->fb_tunnel_dev);
-
-	strcpy(t->parms.name, ipn->fb_tunnel_dev->name);
-	return 0;
-
-err_reg_dev:
-	ipip_dev_free(ipn->fb_tunnel_dev);
-err_alloc_dev:
-	/* nothing */
-	return err;
+	return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 }
 
 static void __net_exit ipip_exit_net(struct net *net)
 {
-	struct ipip_net *ipn = net_generic(net, ipip_net_id);
-	LIST_HEAD(list);
-
-	rtnl_lock();
-	ipip_destroy_tunnels(ipn, &list);
-	unregister_netdevice_queue(ipn->fb_tunnel_dev, &list);
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+	struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
+	ip_tunnel_delete_net(itn);
 }
 
 static struct pernet_operations ipip_net_ops = {
 	.init = ipip_init_net,
 	.exit = ipip_exit_net,
 	.id   = &ipip_net_id,
-	.size = sizeof(struct ipip_net),
+	.size = sizeof(struct ip_tunnel_net),
 };
 
 static int __init ipip_init(void)
 {
 	int err;
 
-	printk(banner);
+	pr_info("ipip: IPv4 over IPv4 tunneling driver\n");
 
 	err = register_pernet_device(&ipip_net_ops);
 	if (err < 0)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index a9454cb..9d9610a 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -61,7 +61,7 @@
 #include <linux/netfilter_ipv4.h>
 #include <linux/compat.h>
 #include <linux/export.h>
-#include <net/ipip.h>
+#include <net/ip_tunnels.h>
 #include <net/checksum.h>
 #include <net/netlink.h>
 #include <net/fib_rules.h>
@@ -626,9 +626,9 @@ static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
 		if (ip_hdr(skb)->version == 0) {
 			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
 			nlh->nlmsg_type = NLMSG_ERROR;
-			nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
+			nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
 			skb_trim(skb, nlh->nlmsg_len);
-			e = NLMSG_DATA(nlh);
+			e = nlmsg_data(nlh);
 			e->error = -ETIMEDOUT;
 			memset(&e->msg, 0, sizeof(e->msg));
 
@@ -828,6 +828,49 @@ static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
 	return NULL;
 }
 
+/* Look for a (*,*,oif) entry */
+static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
+						    int vifi)
+{
+	int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY));
+	struct mfc_cache *c;
+
+	list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
+		if (c->mfc_origin == htonl(INADDR_ANY) &&
+		    c->mfc_mcastgrp == htonl(INADDR_ANY) &&
+		    c->mfc_un.res.ttls[vifi] < 255)
+			return c;
+
+	return NULL;
+}
+
+/* Look for a (*,G) entry */
+static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
+					     __be32 mcastgrp, int vifi)
+{
+	int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY));
+	struct mfc_cache *c, *proxy;
+
+	if (mcastgrp == htonl(INADDR_ANY))
+		goto skip;
+
+	list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
+		if (c->mfc_origin == htonl(INADDR_ANY) &&
+		    c->mfc_mcastgrp == mcastgrp) {
+			if (c->mfc_un.res.ttls[vifi] < 255)
+				return c;
+
+			/* It's ok if the vifi is part of the static tree */
+			proxy = ipmr_cache_find_any_parent(mrt,
+							   c->mfc_parent);
+			if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
+				return c;
+		}
+
+skip:
+	return ipmr_cache_find_any_parent(mrt, vifi);
+}
+
 /*
  *	Allocate a multicast cache entry
  */
@@ -867,14 +910,14 @@ static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
 		if (ip_hdr(skb)->version == 0) {
 			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
 
-			if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
+			if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
 				nlh->nlmsg_len = skb_tail_pointer(skb) -
 						 (u8 *)nlh;
 			} else {
 				nlh->nlmsg_type = NLMSG_ERROR;
-				nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
+				nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
 				skb_trim(skb, nlh->nlmsg_len);
-				e = NLMSG_DATA(nlh);
+				e = nlmsg_data(nlh);
 				e->error = -EMSGSIZE;
 				memset(&e->msg, 0, sizeof(e->msg));
 			}
@@ -1053,7 +1096,7 @@ ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
  *	MFC cache manipulation by user space mroute daemon
  */
 
-static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
+static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
 {
 	int line;
 	struct mfc_cache *c, *next;
@@ -1062,7 +1105,8 @@ static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
 
 	list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
 		if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
-		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
+		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
+		    (parent == -1 || parent == c->mfc_parent)) {
 			list_del_rcu(&c->list);
 			mroute_netlink_event(mrt, c, RTM_DELROUTE);
 			ipmr_cache_free(c);
@@ -1073,7 +1117,7 @@ static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
 }
 
 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
-			struct mfcctl *mfc, int mrtsock)
+			struct mfcctl *mfc, int mrtsock, int parent)
 {
 	bool found = false;
 	int line;
@@ -1086,7 +1130,8 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
 
 	list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
 		if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
-		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
+		    c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
+		    (parent == -1 || parent == c->mfc_parent)) {
 			found = true;
 			break;
 		}
@@ -1103,7 +1148,8 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
 		return 0;
 	}
 
-	if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
+	if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
+	    !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
 		return -EINVAL;
 
 	c = ipmr_cache_alloc();
@@ -1218,7 +1264,7 @@ static void mrtsock_destruct(struct sock *sk)
 
 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
 {
-	int ret;
+	int ret, parent = 0;
 	struct vifctl vif;
 	struct mfcctl mfc;
 	struct net *net = sock_net(sk);
@@ -1287,16 +1333,22 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsi
 		 */
 	case MRT_ADD_MFC:
 	case MRT_DEL_MFC:
+		parent = -1;
+	case MRT_ADD_MFC_PROXY:
+	case MRT_DEL_MFC_PROXY:
 		if (optlen != sizeof(mfc))
 			return -EINVAL;
 		if (copy_from_user(&mfc, optval, sizeof(mfc)))
 			return -EFAULT;
+		if (parent == 0)
+			parent = mfc.mfcc_parent;
 		rtnl_lock();
-		if (optname == MRT_DEL_MFC)
-			ret = ipmr_mfc_delete(mrt, &mfc);
+		if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
+			ret = ipmr_mfc_delete(mrt, &mfc, parent);
 		else
 			ret = ipmr_mfc_add(net, mrt, &mfc,
-					   sk == rtnl_dereference(mrt->mroute_sk));
+					   sk == rtnl_dereference(mrt->mroute_sk),
+					   parent);
 		rtnl_unlock();
 		return ret;
 		/*
@@ -1749,17 +1801,28 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
 {
 	int psend = -1;
 	int vif, ct;
+	int true_vifi = ipmr_find_vif(mrt, skb->dev);
 
 	vif = cache->mfc_parent;
 	cache->mfc_un.res.pkt++;
 	cache->mfc_un.res.bytes += skb->len;
 
+	if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
+		struct mfc_cache *cache_proxy;
+
+		/* For an (*,G) entry, we only check that the incomming
+		 * interface is part of the static tree.
+		 */
+		cache_proxy = ipmr_cache_find_any_parent(mrt, vif);
+		if (cache_proxy &&
+		    cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
+			goto forward;
+	}
+
 	/*
 	 * Wrong interface: drop packet and (maybe) send PIM assert.
 	 */
 	if (mrt->vif_table[vif].dev != skb->dev) {
-		int true_vifi;
-
 		if (rt_is_output_route(skb_rtable(skb))) {
 			/* It is our own packet, looped back.
 			 * Very complicated situation...
@@ -1776,7 +1839,6 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
 		}
 
 		cache->mfc_un.res.wrong_if++;
-		true_vifi = ipmr_find_vif(mrt, skb->dev);
 
 		if (true_vifi >= 0 && mrt->mroute_do_assert &&
 		    /* pimsm uses asserts, when switching from RPT to SPT,
@@ -1794,15 +1856,34 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
 		goto dont_forward;
 	}
 
+forward:
 	mrt->vif_table[vif].pkt_in++;
 	mrt->vif_table[vif].bytes_in += skb->len;
 
 	/*
 	 *	Forward the frame
 	 */
+	if (cache->mfc_origin == htonl(INADDR_ANY) &&
+	    cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
+		if (true_vifi >= 0 &&
+		    true_vifi != cache->mfc_parent &&
+		    ip_hdr(skb)->ttl >
+				cache->mfc_un.res.ttls[cache->mfc_parent]) {
+			/* It's an (*,*) entry and the packet is not coming from
+			 * the upstream: forward the packet to the upstream
+			 * only.
+			 */
+			psend = cache->mfc_parent;
+			goto last_forward;
+		}
+		goto dont_forward;
+	}
 	for (ct = cache->mfc_un.res.maxvif - 1;
 	     ct >= cache->mfc_un.res.minvif; ct--) {
-		if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
+		/* For (*,G) entry, don't forward to the incoming interface */
+		if ((cache->mfc_origin != htonl(INADDR_ANY) ||
+		     ct != true_vifi) &&
+		    ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
 			if (psend != -1) {
 				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
 
@@ -1813,6 +1894,7 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
 			psend = ct;
 		}
 	}
+last_forward:
 	if (psend != -1) {
 		if (local) {
 			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
@@ -1902,6 +1984,13 @@ int ip_mr_input(struct sk_buff *skb)
 
 	/* already under rcu_read_lock() */
 	cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
+	if (cache == NULL) {
+		int vif = ipmr_find_vif(mrt, skb->dev);
+
+		if (vif >= 0)
+			cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
+						    vif);
+	}
 
 	/*
 	 *	No usable cache entry
@@ -2107,7 +2196,12 @@ int ipmr_get_route(struct net *net, struct sk_buff *skb,
 
 	rcu_read_lock();
 	cache = ipmr_cache_find(mrt, saddr, daddr);
+	if (cache == NULL && skb->dev) {
+		int vif = ipmr_find_vif(mrt, skb->dev);
 
+		if (vif >= 0)
+			cache = ipmr_cache_find_any(mrt, daddr, vif);
+	}
 	if (cache == NULL) {
 		struct sk_buff *skb2;
 		struct iphdr *iph;
@@ -2609,16 +2703,16 @@ static int __net_init ipmr_net_init(struct net *net)
 
 #ifdef CONFIG_PROC_FS
 	err = -ENOMEM;
-	if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops))
+	if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
 		goto proc_vif_fail;
-	if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops))
+	if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
 		goto proc_cache_fail;
 #endif
 	return 0;
 
 #ifdef CONFIG_PROC_FS
 proc_cache_fail:
-	proc_net_remove(net, "ip_mr_vif");
+	remove_proc_entry("ip_mr_vif", net->proc_net);
 proc_vif_fail:
 	ipmr_rules_exit(net);
 #endif
@@ -2629,8 +2723,8 @@ fail:
 static void __net_exit ipmr_net_exit(struct net *net)
 {
 #ifdef CONFIG_PROC_FS
-	proc_net_remove(net, "ip_mr_cache");
-	proc_net_remove(net, "ip_mr_vif");
+	remove_proc_entry("ip_mr_cache", net->proc_net);
+	remove_proc_entry("ip_mr_vif", net->proc_net);
 #endif
 	ipmr_rules_exit(net);
 }
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index 4c0cf63..c3e0ade 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -1,4 +1,9 @@
-/* IPv4 specific functions of netfilter core */
+/*
+ * IPv4 specific functions of netfilter core
+ *
+ * Rusty Russell (C) 2000 -- This code is GPL.
+ * Patrick McHardy (C) 2006-2012
+ */
 #include <linux/kernel.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
@@ -40,14 +45,14 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
 	fl4.flowi4_flags = flags;
 	rt = ip_route_output_key(net, &fl4);
 	if (IS_ERR(rt))
-		return -1;
+		return PTR_ERR(rt);
 
 	/* Drop old route. */
 	skb_dst_drop(skb);
 	skb_dst_set(skb, &rt->dst);
 
 	if (skb_dst(skb)->error)
-		return -1;
+		return skb_dst(skb)->error;
 
 #ifdef CONFIG_XFRM
 	if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
@@ -56,7 +61,7 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
 		skb_dst_set(skb, NULL);
 		dst = xfrm_lookup(net, dst, flowi4_to_flowi(&fl4), skb->sk, 0);
 		if (IS_ERR(dst))
-			return -1;
+			return PTR_ERR(dst);;
 		skb_dst_set(skb, dst);
 	}
 #endif
@@ -66,7 +71,7 @@ int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
 	if (skb_headroom(skb) < hh_len &&
 	    pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
 				0, GFP_ATOMIC))
-		return -1;
+		return -ENOMEM;
 
 	return 0;
 }
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index d8d6f2a..e7916c1 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -36,19 +36,6 @@ config NF_CONNTRACK_PROC_COMPAT
 
 	  If unsure, say Y.
 
-config IP_NF_QUEUE
-	tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
-	depends on NETFILTER_ADVANCED
-	help
-	  Netfilter has the ability to queue packets to user space: the
-	  netlink device can be used to access them using this driver.
-
-	  This option enables the old IPv4-only "ip_queue" implementation
-	  which has been obsoleted by the new "nfnetlink_queue" code (see
-	  CONFIG_NETFILTER_NETLINK_QUEUE).
-
-	  To compile it as a module, choose M here.  If unsure, say N.
-
 config IP_NF_IPTABLES
 	tristate "IP tables support (required for filtering/masq/NAT)"
 	default m if NETFILTER_ADVANCED=n
@@ -84,7 +71,7 @@ config IP_NF_MATCH_ECN
 
 config IP_NF_MATCH_RPFILTER
 	tristate '"rpfilter" reverse path filter match support'
-	depends on NETFILTER_ADVANCED
+	depends on NETFILTER_ADVANCED && (IP_NF_MANGLE || IP_NF_RAW)
 	---help---
 	  This option allows you to match packets whose replies would
 	  go out via the interface the packet came in.
@@ -241,8 +228,8 @@ config IP_NF_MANGLE
 	  To compile it as a module, choose M here.  If unsure, say N.
 
 config IP_NF_TARGET_CLUSTERIP
-	tristate "CLUSTERIP target support (EXPERIMENTAL)"
-	depends on IP_NF_MANGLE && EXPERIMENTAL
+	tristate "CLUSTERIP target support"
+	depends on IP_NF_MANGLE
 	depends on NF_CONNTRACK_IPV4
 	depends on NETFILTER_ADVANCED
 	select NF_CONNTRACK_MARK
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 3ea4127..85a4f21 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -6,6 +6,7 @@
  * Some ARP specific bits are:
  *
  * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ * Copyright (C) 2006-2009 Patrick McHardy <kaber@trash.net>
  *
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -901,7 +902,7 @@ static int get_info(struct net *net, void __user *user,
 #endif
 	t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
 				    "arptable_%s", name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		struct arpt_getinfo info;
 		const struct xt_table_info *private = t->private;
 #ifdef CONFIG_COMPAT
@@ -958,7 +959,7 @@ static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
 	}
 
 	t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 
 		duprintf("t->private->number = %u\n",
@@ -1001,7 +1002,7 @@ static int __do_replace(struct net *net, const char *name,
 
 	t = try_then_request_module(xt_find_table_lock(net, NFPROTO_ARP, name),
 				    "arptable_%s", name);
-	if (!t || IS_ERR(t)) {
+	if (IS_ERR_OR_NULL(t)) {
 		ret = t ? PTR_ERR(t) : -ENOENT;
 		goto free_newinfo_counters_untrans;
 	}
@@ -1158,7 +1159,7 @@ static int do_add_counters(struct net *net, const void __user *user,
 	}
 
 	t = xt_find_table_lock(net, NFPROTO_ARP, name);
-	if (!t || IS_ERR(t)) {
+	if (IS_ERR_OR_NULL(t)) {
 		ret = t ? PTR_ERR(t) : -ENOENT;
 		goto free;
 	}
@@ -1646,7 +1647,7 @@ static int compat_get_entries(struct net *net,
 
 	xt_compat_lock(NFPROTO_ARP);
 	t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 		struct xt_table_info info;
 
diff --git a/net/ipv4/netfilter/arptable_filter.c b/net/ipv4/netfilter/arptable_filter.c
index 79ca5e7..eadab1e 100644
--- a/net/ipv4/netfilter/arptable_filter.c
+++ b/net/ipv4/netfilter/arptable_filter.c
@@ -48,9 +48,7 @@ static int __net_init arptable_filter_net_init(struct net *net)
 	net->ipv4.arptable_filter =
 		arpt_register_table(net, &packet_filter, repl);
 	kfree(repl);
-	if (IS_ERR(net->ipv4.arptable_filter))
-		return PTR_ERR(net->ipv4.arptable_filter);
-	return 0;
+	return PTR_RET(net->ipv4.arptable_filter);
 }
 
 static void __net_exit arptable_filter_net_exit(struct net *net)
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 537b249..cb91101 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -3,6 +3,7 @@
  *
  * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
  * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
+ * Copyright (C) 2006-2010 Patrick McHardy <kaber@trash.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -195,8 +196,7 @@ ipt_get_target_c(const struct ipt_entry *e)
 	return ipt_get_target((struct ipt_entry *)e);
 }
 
-#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
-    defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
 static const char *const hooknames[] = {
 	[NF_INET_PRE_ROUTING]		= "PREROUTING",
 	[NF_INET_LOCAL_IN]		= "INPUT",
@@ -272,6 +272,7 @@ static void trace_packet(const struct sk_buff *skb,
 	const char *hookname, *chainname, *comment;
 	const struct ipt_entry *iter;
 	unsigned int rulenum = 0;
+	struct net *net = dev_net(in ? in : out);
 
 	table_base = private->entries[smp_processor_id()];
 	root = get_entry(table_base, private->hook_entry[hook]);
@@ -284,7 +285,7 @@ static void trace_packet(const struct sk_buff *skb,
 		    &chainname, &comment, &rulenum) != 0)
 			break;
 
-	nf_log_packet(AF_INET, hook, skb, in, out, &trace_loginfo,
+	nf_log_packet(net, AF_INET, hook, skb, in, out, &trace_loginfo,
 		      "TRACE: %s:%s:%s:%u ",
 		      tablename, chainname, comment, rulenum);
 }
@@ -374,8 +375,7 @@ ipt_do_table(struct sk_buff *skb,
 		t = ipt_get_target(e);
 		IP_NF_ASSERT(t->u.kernel.target);
 
-#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
-    defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
+#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
 		/* The packet is traced: log it */
 		if (unlikely(skb->nf_trace))
 			trace_packet(skb, hook, in, out,
@@ -1162,7 +1162,7 @@ static int get_info(struct net *net, void __user *user,
 #endif
 	t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
 				    "iptable_%s", name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		struct ipt_getinfo info;
 		const struct xt_table_info *private = t->private;
 #ifdef CONFIG_COMPAT
@@ -1221,7 +1221,7 @@ get_entries(struct net *net, struct ipt_get_entries __user *uptr,
 	}
 
 	t = xt_find_table_lock(net, AF_INET, get.name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 		duprintf("t->private->number = %u\n", private->number);
 		if (get.size == private->size)
@@ -1271,7 +1271,7 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
 
 	t = try_then_request_module(xt_find_table_lock(net, AF_INET, name),
 				    "iptable_%s", name);
-	if (!t || IS_ERR(t)) {
+	if (IS_ERR_OR_NULL(t)) {
 		ret = t ? PTR_ERR(t) : -ENOENT;
 		goto free_newinfo_counters_untrans;
 	}
@@ -1436,7 +1436,7 @@ do_add_counters(struct net *net, const void __user *user,
 	}
 
 	t = xt_find_table_lock(net, AF_INET, name);
-	if (!t || IS_ERR(t)) {
+	if (IS_ERR_OR_NULL(t)) {
 		ret = t ? PTR_ERR(t) : -ENOENT;
 		goto free;
 	}
@@ -2020,7 +2020,7 @@ compat_get_entries(struct net *net, struct compat_ipt_get_entries __user *uptr,
 
 	xt_compat_lock(AF_INET);
 	t = xt_find_table_lock(net, AF_INET, get.name);
-	if (t && !IS_ERR(t)) {
+	if (!IS_ERR_OR_NULL(t)) {
 		const struct xt_table_info *private = t->private;
 		struct xt_table_info info;
 		duprintf("t->private->number = %u\n", private->number);
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index 75e33a7..0b732ef 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -105,7 +105,7 @@ clusterip_config_entry_put(struct clusterip_config *c)
 		 * functions are also incrementing the refcount on their own,
 		 * so it's safe to remove the entry even if it's in use. */
 #ifdef CONFIG_PROC_FS
-		remove_proc_entry(c->pde->name, c->pde->parent);
+		proc_remove(c->pde);
 #endif
 		return;
 	}
@@ -631,7 +631,7 @@ static int clusterip_proc_open(struct inode *inode, struct file *file)
 
 	if (!ret) {
 		struct seq_file *sf = file->private_data;
-		struct clusterip_config *c = PDE(inode)->data;
+		struct clusterip_config *c = PDE_DATA(inode);
 
 		sf->private = c;
 
@@ -643,7 +643,7 @@ static int clusterip_proc_open(struct inode *inode, struct file *file)
 
 static int clusterip_proc_release(struct inode *inode, struct file *file)
 {
-	struct clusterip_config *c = PDE(inode)->data;
+	struct clusterip_config *c = PDE_DATA(inode);
 	int ret;
 
 	ret = seq_release(inode, file);
@@ -657,7 +657,7 @@ static int clusterip_proc_release(struct inode *inode, struct file *file)
 static ssize_t clusterip_proc_write(struct file *file, const char __user *input,
 				size_t size, loff_t *ofs)
 {
-	struct clusterip_config *c = PDE(file->f_path.dentry->d_inode)->data;
+	struct clusterip_config *c = PDE_DATA(file_inode(file));
 #define PROC_WRITELEN	10
 	char buffer[PROC_WRITELEN+1];
 	unsigned long nodenum;
@@ -736,7 +736,7 @@ static void __exit clusterip_tg_exit(void)
 {
 	pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
 #ifdef CONFIG_PROC_FS
-	remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
+	proc_remove(clusterip_procdir);
 #endif
 	nf_unregister_hook(&cip_arp_ops);
 	xt_unregister_target(&clusterip_tg_reg);
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index b5ef3cb..32b0e97 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -4,6 +4,7 @@
  * (C) 2000-2004 by Harald Welte <laforge@netfilter.org>
  * (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2005-2007 Patrick McHardy <kaber@trash.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -37,7 +38,7 @@
 #include <linux/skbuff.h>
 #include <linux/kernel.h>
 #include <linux/timer.h>
-#include <linux/netlink.h>
+#include <net/netlink.h>
 #include <linux/netdevice.h>
 #include <linux/mm.h>
 #include <linux/moduleparam.h>
@@ -45,6 +46,7 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter_ipv4/ipt_ULOG.h>
 #include <net/netfilter/nf_log.h>
+#include <net/netns/generic.h>
 #include <net/sock.h>
 #include <linux/bitops.h>
 #include <asm/unaligned.h>
@@ -78,20 +80,26 @@ typedef struct {
 	struct timer_list timer;	/* the timer function */
 } ulog_buff_t;
 
-static ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];	/* array of buffers */
+static int ulog_net_id __read_mostly;
+struct ulog_net {
+	unsigned int nlgroup[ULOG_MAXNLGROUPS];
+	ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS];
+	struct sock *nflognl;
+	spinlock_t lock;
+};
 
-static struct sock *nflognl;		/* our socket */
-static DEFINE_SPINLOCK(ulog_lock);	/* spinlock */
+static struct ulog_net *ulog_pernet(struct net *net)
+{
+	return net_generic(net, ulog_net_id);
+}
 
 /* send one ulog_buff_t to userspace */
-static void ulog_send(unsigned int nlgroupnum)
+static void ulog_send(struct ulog_net *ulog, unsigned int nlgroupnum)
 {
-	ulog_buff_t *ub = &ulog_buffers[nlgroupnum];
+	ulog_buff_t *ub = &ulog->ulog_buffers[nlgroupnum];
 
-	if (timer_pending(&ub->timer)) {
-		pr_debug("ulog_send: timer was pending, deleting\n");
-		del_timer(&ub->timer);
-	}
+	pr_debug("ulog_send: timer is deleting\n");
+	del_timer(&ub->timer);
 
 	if (!ub->skb) {
 		pr_debug("ulog_send: nothing to send\n");
@@ -105,7 +113,8 @@ static void ulog_send(unsigned int nlgroupnum)
 	NETLINK_CB(ub->skb).dst_group = nlgroupnum + 1;
 	pr_debug("throwing %d packets to netlink group %u\n",
 		 ub->qlen, nlgroupnum + 1);
-	netlink_broadcast(nflognl, ub->skb, 0, nlgroupnum + 1, GFP_ATOMIC);
+	netlink_broadcast(ulog->nflognl, ub->skb, 0, nlgroupnum + 1,
+			  GFP_ATOMIC);
 
 	ub->qlen = 0;
 	ub->skb = NULL;
@@ -116,13 +125,17 @@ static void ulog_send(unsigned int nlgroupnum)
 /* timer function to flush queue in flushtimeout time */
 static void ulog_timer(unsigned long data)
 {
+	unsigned int groupnum = *((unsigned int *)data);
+	struct ulog_net *ulog = container_of((void *)data,
+					     struct ulog_net,
+					     nlgroup[groupnum]);
 	pr_debug("timer function called, calling ulog_send\n");
 
 	/* lock to protect against somebody modifying our structure
 	 * from ipt_ulog_target at the same time */
-	spin_lock_bh(&ulog_lock);
-	ulog_send(data);
-	spin_unlock_bh(&ulog_lock);
+	spin_lock_bh(&ulog->lock);
+	ulog_send(ulog, groupnum);
+	spin_unlock_bh(&ulog->lock);
 }
 
 static struct sk_buff *ulog_alloc_skb(unsigned int size)
@@ -150,7 +163,8 @@ static struct sk_buff *ulog_alloc_skb(unsigned int size)
 	return skb;
 }
 
-static void ipt_ulog_packet(unsigned int hooknum,
+static void ipt_ulog_packet(struct net *net,
+			    unsigned int hooknum,
 			    const struct sk_buff *skb,
 			    const struct net_device *in,
 			    const struct net_device *out,
@@ -162,6 +176,7 @@ static void ipt_ulog_packet(unsigned int hooknum,
 	size_t size, copy_len;
 	struct nlmsghdr *nlh;
 	struct timeval tv;
+	struct ulog_net *ulog = ulog_pernet(net);
 
 	/* ffs == find first bit set, necessary because userspace
 	 * is already shifting groupnumber, but we need unshifted.
@@ -174,11 +189,11 @@ static void ipt_ulog_packet(unsigned int hooknum,
 	else
 		copy_len = loginfo->copy_range;
 
-	size = NLMSG_SPACE(sizeof(*pm) + copy_len);
+	size = nlmsg_total_size(sizeof(*pm) + copy_len);
 
-	ub = &ulog_buffers[groupnum];
+	ub = &ulog->ulog_buffers[groupnum];
 
-	spin_lock_bh(&ulog_lock);
+	spin_lock_bh(&ulog->lock);
 
 	if (!ub->skb) {
 		if (!(ub->skb = ulog_alloc_skb(size)))
@@ -188,7 +203,7 @@ static void ipt_ulog_packet(unsigned int hooknum,
 		/* either the queue len is too high or we don't have
 		 * enough room in nlskb left. send it to userspace. */
 
-		ulog_send(groupnum);
+		ulog_send(ulog, groupnum);
 
 		if (!(ub->skb = ulog_alloc_skb(size)))
 			goto alloc_failure;
@@ -217,8 +232,10 @@ static void ipt_ulog_packet(unsigned int hooknum,
 	put_unaligned(tv.tv_usec, &pm->timestamp_usec);
 	put_unaligned(skb->mark, &pm->mark);
 	pm->hook = hooknum;
-	if (prefix != NULL)
-		strncpy(pm->prefix, prefix, sizeof(pm->prefix));
+	if (prefix != NULL) {
+		strncpy(pm->prefix, prefix, sizeof(pm->prefix) - 1);
+		pm->prefix[sizeof(pm->prefix) - 1] = '\0';
+	}
 	else if (loginfo->prefix[0] != '\0')
 		strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
 	else
@@ -262,27 +279,30 @@ static void ipt_ulog_packet(unsigned int hooknum,
 	if (ub->qlen >= loginfo->qthreshold) {
 		if (loginfo->qthreshold > 1)
 			nlh->nlmsg_type = NLMSG_DONE;
-		ulog_send(groupnum);
+		ulog_send(ulog, groupnum);
 	}
 out_unlock:
-	spin_unlock_bh(&ulog_lock);
+	spin_unlock_bh(&ulog->lock);
 
 	return;
 
 alloc_failure:
 	pr_debug("Error building netlink message\n");
-	spin_unlock_bh(&ulog_lock);
+	spin_unlock_bh(&ulog->lock);
 }
 
 static unsigned int
 ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
-	ipt_ulog_packet(par->hooknum, skb, par->in, par->out,
+	struct net *net = dev_net(par->in ? par->in : par->out);
+
+	ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
 	                par->targinfo, NULL);
 	return XT_CONTINUE;
 }
 
-static void ipt_logfn(u_int8_t pf,
+static void ipt_logfn(struct net *net,
+		      u_int8_t pf,
 		      unsigned int hooknum,
 		      const struct sk_buff *skb,
 		      const struct net_device *in,
@@ -304,7 +324,7 @@ static void ipt_logfn(u_int8_t pf,
 		strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
 	}
 
-	ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
+	ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
 }
 
 static int ulog_tg_check(const struct xt_tgchk_param *par)
@@ -378,58 +398,48 @@ static struct nf_logger ipt_ulog_logger __read_mostly = {
 	.me		= THIS_MODULE,
 };
 
-static int __init ulog_tg_init(void)
+static int __net_init ulog_tg_net_init(struct net *net)
 {
-	int ret, i;
+	int i;
+	struct ulog_net *ulog = ulog_pernet(net);
 	struct netlink_kernel_cfg cfg = {
 		.groups	= ULOG_MAXNLGROUPS,
 	};
 
-	pr_debug("init module\n");
-
-	if (nlbufsiz > 128*1024) {
-		pr_warning("Netlink buffer has to be <= 128kB\n");
-		return -EINVAL;
-	}
-
+	spin_lock_init(&ulog->lock);
 	/* initialize ulog_buffers */
-	for (i = 0; i < ULOG_MAXNLGROUPS; i++)
-		setup_timer(&ulog_buffers[i].timer, ulog_timer, i);
+	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
+		ulog->nlgroup[i] = i;
+		setup_timer(&ulog->ulog_buffers[i].timer, ulog_timer,
+			    (unsigned long)&ulog->nlgroup[i]);
+	}
 
-	nflognl = netlink_kernel_create(&init_net, NETLINK_NFLOG, &cfg);
-	if (!nflognl)
+	ulog->nflognl = netlink_kernel_create(net, NETLINK_NFLOG, &cfg);
+	if (!ulog->nflognl)
 		return -ENOMEM;
 
-	ret = xt_register_target(&ulog_tg_reg);
-	if (ret < 0) {
-		netlink_kernel_release(nflognl);
-		return ret;
-	}
 	if (nflog)
-		nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
+		nf_log_set(net, NFPROTO_IPV4, &ipt_ulog_logger);
 
 	return 0;
 }
 
-static void __exit ulog_tg_exit(void)
+static void __net_exit ulog_tg_net_exit(struct net *net)
 {
 	ulog_buff_t *ub;
 	int i;
-
-	pr_debug("cleanup_module\n");
+	struct ulog_net *ulog = ulog_pernet(net);
 
 	if (nflog)
-		nf_log_unregister(&ipt_ulog_logger);
-	xt_unregister_target(&ulog_tg_reg);
-	netlink_kernel_release(nflognl);
+		nf_log_unset(net, &ipt_ulog_logger);
+
+	netlink_kernel_release(ulog->nflognl);
 
 	/* remove pending timers and free allocated skb's */
 	for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
-		ub = &ulog_buffers[i];
-		if (timer_pending(&ub->timer)) {
-			pr_debug("timer was pending, deleting\n");
-			del_timer(&ub->timer);
-		}
+		ub = &ulog->ulog_buffers[i];
+		pr_debug("timer is deleting\n");
+		del_timer(&ub->timer);
 
 		if (ub->skb) {
 			kfree_skb(ub->skb);
@@ -438,5 +448,50 @@ static void __exit ulog_tg_exit(void)
 	}
 }
 
+static struct pernet_operations ulog_tg_net_ops = {
+	.init = ulog_tg_net_init,
+	.exit = ulog_tg_net_exit,
+	.id   = &ulog_net_id,
+	.size = sizeof(struct ulog_net),
+};
+
+static int __init ulog_tg_init(void)
+{
+	int ret;
+	pr_debug("init module\n");
+
+	if (nlbufsiz > 128*1024) {
+		pr_warn("Netlink buffer has to be <= 128kB\n");
+		return -EINVAL;
+	}
+
+	ret = register_pernet_subsys(&ulog_tg_net_ops);
+	if (ret)
+		goto out_pernet;
+
+	ret = xt_register_target(&ulog_tg_reg);
+	if (ret < 0)
+		goto out_target;
+
+	if (nflog)
+		nf_log_register(NFPROTO_IPV4, &ipt_ulog_logger);
+
+	return 0;
+
+out_target:
+	unregister_pernet_subsys(&ulog_tg_net_ops);
+out_pernet:
+	return ret;
+}
+
+static void __exit ulog_tg_exit(void)
+{
+	pr_debug("cleanup_module\n");
+	if (nflog)
+		nf_log_unregister(&ipt_ulog_logger);
+	xt_unregister_target(&ulog_tg_reg);
+	unregister_pernet_subsys(&ulog_tg_net_ops);
+}
+
 module_init(ulog_tg_init);
 module_exit(ulog_tg_exit);
diff --git a/net/ipv4/netfilter/ipt_rpfilter.c b/net/ipv4/netfilter/ipt_rpfilter.c
index c301300..c49dcd0 100644
--- a/net/ipv4/netfilter/ipt_rpfilter.c
+++ b/net/ipv4/netfilter/ipt_rpfilter.c
@@ -66,6 +66,12 @@ static bool rpfilter_lookup_reverse(struct flowi4 *fl4,
 	return dev_match;
 }
 
+static bool rpfilter_is_local(const struct sk_buff *skb)
+{
+	const struct rtable *rt = skb_rtable(skb);
+	return rt && (rt->rt_flags & RTCF_LOCAL);
+}
+
 static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
 {
 	const struct xt_rpfilter_info *info;
@@ -76,7 +82,7 @@ static bool rpfilter_mt(const struct sk_buff *skb, struct xt_action_param *par)
 	info = par->matchinfo;
 	invert = info->flags & XT_RPFILTER_INVERT;
 
-	if (par->in->flags & IFF_LOOPBACK)
+	if (rpfilter_is_local(skb))
 		return true ^ invert;
 
 	iph = ip_hdr(skb);
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index 85d88f2..cba5658 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -44,6 +44,7 @@ ipt_mangle_out(struct sk_buff *skb, const struct net_device *out)
 	u_int8_t tos;
 	__be32 saddr, daddr;
 	u_int32_t mark;
+	int err;
 
 	/* root is playing with raw sockets. */
 	if (skb->len < sizeof(struct iphdr) ||
@@ -66,9 +67,11 @@ ipt_mangle_out(struct sk_buff *skb, const struct net_device *out)
 		if (iph->saddr != saddr ||
 		    iph->daddr != daddr ||
 		    skb->mark != mark ||
-		    iph->tos != tos)
-			if (ip_route_me_harder(skb, RTN_UNSPEC))
-				ret = NF_DROP;
+		    iph->tos != tos) {
+			err = ip_route_me_harder(skb, RTN_UNSPEC);
+			if (err < 0)
+				ret = NF_DROP_ERR(err);
+		}
 	}
 
 	return ret;
diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index eeaff7e..6383273 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -176,6 +176,7 @@ nf_nat_ipv4_out(unsigned int hooknum,
 #ifdef CONFIG_XFRM
 	const struct nf_conn *ct;
 	enum ip_conntrack_info ctinfo;
+	int err;
 #endif
 	unsigned int ret;
 
@@ -195,9 +196,11 @@ nf_nat_ipv4_out(unsigned int hooknum,
 		     ct->tuplehash[!dir].tuple.dst.u3.ip) ||
 		    (ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
 		     ct->tuplehash[dir].tuple.src.u.all !=
-		     ct->tuplehash[!dir].tuple.dst.u.all))
-			if (nf_xfrm_me_harder(skb, AF_INET) < 0)
-				ret = NF_DROP;
+		     ct->tuplehash[!dir].tuple.dst.u.all)) {
+			err = nf_xfrm_me_harder(skb, AF_INET);
+			if (err < 0)
+				ret = NF_DROP_ERR(err);
+		}
 	}
 #endif
 	return ret;
@@ -213,6 +216,7 @@ nf_nat_ipv4_local_fn(unsigned int hooknum,
 	const struct nf_conn *ct;
 	enum ip_conntrack_info ctinfo;
 	unsigned int ret;
+	int err;
 
 	/* root is playing with raw sockets. */
 	if (skb->len < sizeof(struct iphdr) ||
@@ -226,16 +230,19 @@ nf_nat_ipv4_local_fn(unsigned int hooknum,
 
 		if (ct->tuplehash[dir].tuple.dst.u3.ip !=
 		    ct->tuplehash[!dir].tuple.src.u3.ip) {
-			if (ip_route_me_harder(skb, RTN_UNSPEC))
-				ret = NF_DROP;
+			err = ip_route_me_harder(skb, RTN_UNSPEC);
+			if (err < 0)
+				ret = NF_DROP_ERR(err);
 		}
 #ifdef CONFIG_XFRM
 		else if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
 			 ct->tuplehash[dir].tuple.dst.protonum != IPPROTO_ICMP &&
 			 ct->tuplehash[dir].tuple.dst.u.all !=
-			 ct->tuplehash[!dir].tuple.src.u.all)
-			if (nf_xfrm_me_harder(skb, AF_INET) < 0)
-				ret = NF_DROP;
+			 ct->tuplehash[!dir].tuple.src.u.all) {
+			err = nf_xfrm_me_harder(skb, AF_INET);
+			if (err < 0)
+				ret = NF_DROP_ERR(err);
+		}
 #endif
 	}
 	return ret;
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index fcdd0c2..567d841 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -1,6 +1,7 @@
 
 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -100,7 +101,6 @@ static unsigned int ipv4_helper(unsigned int hooknum,
 	enum ip_conntrack_info ctinfo;
 	const struct nf_conn_help *help;
 	const struct nf_conntrack_helper *helper;
-	unsigned int ret;
 
 	/* This is where we call the helper: as the packet goes out. */
 	ct = nf_ct_get(skb, &ctinfo);
@@ -116,13 +116,8 @@ static unsigned int ipv4_helper(unsigned int hooknum,
 	if (!helper)
 		return NF_ACCEPT;
 
-	ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
-			   ct, ctinfo);
-	if (ret != NF_ACCEPT && (ret & NF_VERDICT_MASK) != NF_QUEUE) {
-		nf_log_packet(NFPROTO_IPV4, hooknum, skb, in, out, NULL,
-			      "nf_ct_%s: dropping packet", helper->name);
-	}
-	return ret;
+	return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
+			    ct, ctinfo);
 }
 
 static unsigned int ipv4_confirm(unsigned int hooknum,
@@ -420,54 +415,43 @@ static int ipv4_net_init(struct net *net)
 {
 	int ret = 0;
 
-	ret = nf_conntrack_l4proto_register(net,
-					    &nf_conntrack_l4proto_tcp4);
+	ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4);
 	if (ret < 0) {
-		pr_err("nf_conntrack_l4proto_tcp4 :protocol register failed\n");
+		pr_err("nf_conntrack_tcp4: pernet registration failed\n");
 		goto out_tcp;
 	}
-	ret = nf_conntrack_l4proto_register(net,
-					    &nf_conntrack_l4proto_udp4);
+	ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4);
 	if (ret < 0) {
-		pr_err("nf_conntrack_l4proto_udp4 :protocol register failed\n");
+		pr_err("nf_conntrack_udp4: pernet registration failed\n");
 		goto out_udp;
 	}
-	ret = nf_conntrack_l4proto_register(net,
-					    &nf_conntrack_l4proto_icmp);
+	ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp);
 	if (ret < 0) {
-		pr_err("nf_conntrack_l4proto_icmp4 :protocol register failed\n");
+		pr_err("nf_conntrack_icmp4: pernet registration failed\n");
 		goto out_icmp;
 	}
-	ret = nf_conntrack_l3proto_register(net,
-					    &nf_conntrack_l3proto_ipv4);
+	ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4);
 	if (ret < 0) {
-		pr_err("nf_conntrack_l3proto_ipv4 :protocol register failed\n");
+		pr_err("nf_conntrack_ipv4: pernet registration failed\n");
 		goto out_ipv4;
 	}
 	return 0;
 out_ipv4:
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_icmp);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
 out_icmp:
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_udp4);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
 out_udp:
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_tcp4);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
 out_tcp:
 	return ret;
 }
 
 static void ipv4_net_exit(struct net *net)
 {
-	nf_conntrack_l3proto_unregister(net,
-					&nf_conntrack_l3proto_ipv4);
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_icmp);
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_udp4);
-	nf_conntrack_l4proto_unregister(net,
-					&nf_conntrack_l4proto_tcp4);
+	nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
+	nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
 }
 
 static struct pernet_operations ipv4_net_ops = {
@@ -500,16 +484,49 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
 		pr_err("nf_conntrack_ipv4: can't register hooks.\n");
 		goto cleanup_pernet;
 	}
+
+	ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4);
+	if (ret < 0) {
+		pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n");
+		goto cleanup_hooks;
+	}
+
+	ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4);
+	if (ret < 0) {
+		pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n");
+		goto cleanup_tcp4;
+	}
+
+	ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp);
+	if (ret < 0) {
+		pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n");
+		goto cleanup_udp4;
+	}
+
+	ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4);
+	if (ret < 0) {
+		pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n");
+		goto cleanup_icmpv4;
+	}
+
 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
 	ret = nf_conntrack_ipv4_compat_init();
 	if (ret < 0)
-		goto cleanup_hooks;
+		goto cleanup_proto;
 #endif
 	return ret;
 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
+ cleanup_proto:
+	nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
+#endif
+ cleanup_icmpv4:
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
+ cleanup_udp4:
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
+ cleanup_tcp4:
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
  cleanup_hooks:
 	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
-#endif
  cleanup_pernet:
 	unregister_pernet_subsys(&ipv4_net_ops);
  cleanup_sockopt:
@@ -523,6 +540,10 @@ static void __exit nf_conntrack_l3proto_ipv4_fini(void)
 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
 	nf_conntrack_ipv4_compat_fini();
 #endif
+	nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
+	nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
 	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
 	unregister_pernet_subsys(&ipv4_net_ops);
 	nf_unregister_sockopt(&so_getorigdst);
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 9682b36..4c48e43 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -2,6 +2,7 @@
  *
  * (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2006-2010 Patrick McHardy <kaber@trash.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -417,12 +418,12 @@ static int __net_init ip_conntrack_net_init(struct net *net)
 {
 	struct proc_dir_entry *proc, *proc_exp, *proc_stat;
 
-	proc = proc_net_fops_create(net, "ip_conntrack", 0440, &ct_file_ops);
+	proc = proc_create("ip_conntrack", 0440, net->proc_net, &ct_file_ops);
 	if (!proc)
 		goto err1;
 
-	proc_exp = proc_net_fops_create(net, "ip_conntrack_expect", 0440,
-					&ip_exp_file_ops);
+	proc_exp = proc_create("ip_conntrack_expect", 0440, net->proc_net,
+			       &ip_exp_file_ops);
 	if (!proc_exp)
 		goto err2;
 
@@ -433,9 +434,9 @@ static int __net_init ip_conntrack_net_init(struct net *net)
 	return 0;
 
 err3:
-	proc_net_remove(net, "ip_conntrack_expect");
+	remove_proc_entry("ip_conntrack_expect", net->proc_net);
 err2:
-	proc_net_remove(net, "ip_conntrack");
+	remove_proc_entry("ip_conntrack", net->proc_net);
 err1:
 	return -ENOMEM;
 }
@@ -443,8 +444,8 @@ err1:
 static void __net_exit ip_conntrack_net_exit(struct net *net)
 {
 	remove_proc_entry("ip_conntrack", net->proc_net_stat);
-	proc_net_remove(net, "ip_conntrack_expect");
-	proc_net_remove(net, "ip_conntrack");
+	remove_proc_entry("ip_conntrack_expect", net->proc_net);
+	remove_proc_entry("ip_conntrack", net->proc_net);
 }
 
 static struct pernet_operations ip_conntrack_net_ops = {
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 5241d99..a338dad 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -1,5 +1,6 @@
 /* (C) 1999-2001 Paul `Rusty' Russell
  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2006-2010 Patrick McHardy <kaber@trash.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -187,8 +188,8 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
 	icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
 	if (icmph == NULL) {
 		if (LOG_INVALID(net, IPPROTO_ICMP))
-			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
-				      "nf_ct_icmp: short packet ");
+			nf_log_packet(net, PF_INET, 0, skb, NULL, NULL,
+				      NULL, "nf_ct_icmp: short packet ");
 		return -NF_ACCEPT;
 	}
 
@@ -196,7 +197,7 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
 	if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
 	    nf_ip_checksum(skb, hooknum, dataoff, 0)) {
 		if (LOG_INVALID(net, IPPROTO_ICMP))
-			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
+			nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
 				      "nf_ct_icmp: bad HW ICMP checksum ");
 		return -NF_ACCEPT;
 	}
@@ -209,7 +210,7 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
 	 */
 	if (icmph->type > NR_ICMP_TYPES) {
 		if (LOG_INVALID(net, IPPROTO_ICMP))
-			nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
+			nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
 				      "nf_ct_icmp: invalid ICMP type ");
 		return -NF_ACCEPT;
 	}
diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c
index 9c3db10..9eea059d 100644
--- a/net/ipv4/netfilter/nf_nat_h323.c
+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -2,6 +2,7 @@
  * H.323 extension for NAT alteration.
  *
  * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
+ * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
  *
  * This source code is licensed under General Public License version 2.
  *
diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c
index a06d7d7..657d230 100644
--- a/net/ipv4/netfilter/nf_nat_pptp.c
+++ b/net/ipv4/netfilter/nf_nat_pptp.c
@@ -13,6 +13,8 @@
  *
  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  *
+ * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
+ *
  * TODO: - NAT to a unique tuple, not to TCP source port
  * 	   (needs netfilter tuple reservation)
  */
diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c
index ea44f02..690d8901 100644
--- a/net/ipv4/netfilter/nf_nat_proto_gre.c
+++ b/net/ipv4/netfilter/nf_nat_proto_gre.c
@@ -21,6 +21,8 @@
  *
  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  *
+ * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
+ *
  */
 
 #include <linux/module.h>
diff --git a/net/ipv4/netfilter/nf_nat_snmp_basic.c b/net/ipv4/netfilter/nf_nat_snmp_basic.c
index bac7122..5f011cc 100644
--- a/net/ipv4/netfilter/nf_nat_snmp_basic.c
+++ b/net/ipv4/netfilter/nf_nat_snmp_basic.c
@@ -38,6 +38,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
  * Author: James Morris <jmorris@intercode.com.au>
+ *
+ * Copyright (c) 2006-2010 Patrick McHardy <kaber@trash.net>
  */
 #include <linux/module.h>
 #include <linux/moduleparam.h>
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 6f9c072..7d93d62 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -322,8 +322,8 @@ void ping_err(struct sk_buff *skb, u32 info)
 	struct iphdr *iph = (struct iphdr *)skb->data;
 	struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
 	struct inet_sock *inet_sock;
-	int type = icmph->type;
-	int code = icmph->code;
+	int type = icmp_hdr(skb)->type;
+	int code = icmp_hdr(skb)->code;
 	struct net *net = dev_net(skb->dev);
 	struct sock *sk;
 	int harderr;
@@ -514,9 +514,8 @@ static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	ipc.opt = NULL;
 	ipc.oif = sk->sk_bound_dev_if;
 	ipc.tx_flags = 0;
-	err = sock_tx_timestamp(sk, &ipc.tx_flags);
-	if (err)
-		return err;
+
+	sock_tx_timestamp(sk, &ipc.tx_flags);
 
 	if (msg->msg_controllen) {
 		err = ip_cmsg_send(sock_net(sk), msg, &ipc);
@@ -889,7 +888,7 @@ static int ping_proc_register(struct net *net)
 	struct proc_dir_entry *p;
 	int rc = 0;
 
-	p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops);
+	p = proc_create("icmp", S_IRUGO, net->proc_net, &ping_seq_fops);
 	if (!p)
 		rc = -ENOMEM;
 	return rc;
@@ -897,7 +896,7 @@ static int ping_proc_register(struct net *net)
 
 static void ping_proc_unregister(struct net *net)
 {
-	proc_net_remove(net, "icmp");
+	remove_proc_entry("icmp", net->proc_net);
 }
 
 
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 8de53e1..2a5bf86 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -125,6 +125,7 @@ static const struct snmp_mib snmp4_ipextstats_list[] = {
 	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
 	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
 	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
+	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
 	SNMP_MIB_SENTINEL
 };
 
@@ -162,6 +163,7 @@ static const struct snmp_mib snmp4_tcp_list[] = {
 	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
 	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
 	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
+	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
 	SNMP_MIB_SENTINEL
 };
 
@@ -172,6 +174,7 @@ static const struct snmp_mib snmp4_udp_list[] = {
 	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
 	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
 	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
+	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
 	SNMP_MIB_SENTINEL
 };
 
@@ -224,6 +227,8 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("TCPForwardRetrans", LINUX_MIB_TCPFORWARDRETRANS),
 	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
 	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
+	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
+	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
 	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
 	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
 	SNMP_MIB_ITEM("TCPSchedulerFailed", LINUX_MIB_TCPSCHEDULERFAILED),
@@ -267,6 +272,7 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
 	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
 	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
+	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
 	SNMP_MIB_SENTINEL
 };
 
@@ -319,15 +325,16 @@ static void icmp_put(struct seq_file *seq)
 	struct net *net = seq->private;
 	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
 
-	seq_puts(seq, "\nIcmp: InMsgs InErrors");
+	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
 	for (i=0; icmpmibmap[i].name != NULL; i++)
 		seq_printf(seq, " In%s", icmpmibmap[i].name);
 	seq_printf(seq, " OutMsgs OutErrors");
 	for (i=0; icmpmibmap[i].name != NULL; i++)
 		seq_printf(seq, " Out%s", icmpmibmap[i].name);
-	seq_printf(seq, "\nIcmp: %lu %lu",
+	seq_printf(seq, "\nIcmp: %lu %lu %lu",
 		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INMSGS),
-		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS));
+		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS),
+		snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
 	for (i=0; icmpmibmap[i].name != NULL; i++)
 		seq_printf(seq, " %lu",
 			   atomic_long_read(ptr + icmpmibmap[i].index));
@@ -471,28 +478,29 @@ static const struct file_operations netstat_seq_fops = {
 
 static __net_init int ip_proc_init_net(struct net *net)
 {
-	if (!proc_net_fops_create(net, "sockstat", S_IRUGO, &sockstat_seq_fops))
+	if (!proc_create("sockstat", S_IRUGO, net->proc_net,
+			 &sockstat_seq_fops))
 		goto out_sockstat;
-	if (!proc_net_fops_create(net, "netstat", S_IRUGO, &netstat_seq_fops))
+	if (!proc_create("netstat", S_IRUGO, net->proc_net, &netstat_seq_fops))
 		goto out_netstat;
-	if (!proc_net_fops_create(net, "snmp", S_IRUGO, &snmp_seq_fops))
+	if (!proc_create("snmp", S_IRUGO, net->proc_net, &snmp_seq_fops))
 		goto out_snmp;
 
 	return 0;
 
 out_snmp:
-	proc_net_remove(net, "netstat");
+	remove_proc_entry("netstat", net->proc_net);
 out_netstat:
-	proc_net_remove(net, "sockstat");
+	remove_proc_entry("sockstat", net->proc_net);
 out_sockstat:
 	return -ENOMEM;
 }
 
 static __net_exit void ip_proc_exit_net(struct net *net)
 {
-	proc_net_remove(net, "snmp");
-	proc_net_remove(net, "netstat");
-	proc_net_remove(net, "sockstat");
+	remove_proc_entry("snmp", net->proc_net);
+	remove_proc_entry("netstat", net->proc_net);
+	remove_proc_entry("sockstat", net->proc_net);
 }
 
 static __net_initdata struct pernet_operations ip_proc_ops = {
diff --git a/net/ipv4/protocol.c b/net/ipv4/protocol.c
index 0f9d09f..ce84846 100644
--- a/net/ipv4/protocol.c
+++ b/net/ipv4/protocol.c
@@ -37,6 +37,12 @@ const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
 
 int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
 {
+	if (!prot->netns_ok) {
+		pr_err("Protocol %u is not namespace aware, cannot register.\n",
+			protocol);
+		return -EINVAL;
+	}
+
 	return !cmpxchg((const struct net_protocol **)&inet_protos[protocol],
 			NULL, prot) ? 0 : -1;
 }
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 6f08991..dd44e0a 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -111,9 +111,7 @@ EXPORT_SYMBOL_GPL(raw_unhash_sk);
 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 		unsigned short num, __be32 raddr, __be32 laddr, int dif)
 {
-	struct hlist_node *node;
-
-	sk_for_each_from(sk, node) {
+	sk_for_each_from(sk) {
 		struct inet_sock *inet = inet_sk(sk);
 
 		if (net_eq(sock_net(sk), net) && inet->inet_num == num	&&
@@ -914,9 +912,7 @@ static struct sock *raw_get_first(struct seq_file *seq)
 
 	for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
 			++state->bucket) {
-		struct hlist_node *node;
-
-		sk_for_each(sk, node, &state->h->ht[state->bucket])
+		sk_for_each(sk, &state->h->ht[state->bucket])
 			if (sock_net(sk) == seq_file_net(seq))
 				goto found;
 	}
@@ -1050,7 +1046,7 @@ static const struct file_operations raw_seq_fops = {
 
 static __net_init int raw_init_net(struct net *net)
 {
-	if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops))
+	if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
 		return -ENOMEM;
 
 	return 0;
@@ -1058,7 +1054,7 @@ static __net_init int raw_init_net(struct net *net)
 
 static __net_exit void raw_exit_net(struct net *net)
 {
-	proc_net_remove(net, "raw");
+	remove_proc_entry("raw", net->proc_net);
 }
 
 static __net_initdata struct pernet_operations raw_net_ops = {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 63354f5..961a718 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -117,15 +117,11 @@
 #define RT_GC_TIMEOUT (300*HZ)
 
 static int ip_rt_max_size;
-static int ip_rt_gc_timeout __read_mostly	= RT_GC_TIMEOUT;
-static int ip_rt_gc_interval __read_mostly  = 60 * HZ;
-static int ip_rt_gc_min_interval __read_mostly	= HZ / 2;
 static int ip_rt_redirect_number __read_mostly	= 9;
 static int ip_rt_redirect_load __read_mostly	= HZ / 50;
 static int ip_rt_redirect_silence __read_mostly	= ((HZ / 50) << (9 + 1));
 static int ip_rt_error_cost __read_mostly	= HZ;
 static int ip_rt_error_burst __read_mostly	= 5 * HZ;
-static int ip_rt_gc_elasticity __read_mostly	= 8;
 static int ip_rt_mtu_expires __read_mostly	= 10 * 60 * HZ;
 static int ip_rt_min_pmtu __read_mostly		= 512 + 20 + 20;
 static int ip_rt_min_advmss __read_mostly	= 256;
@@ -388,8 +384,8 @@ static int __net_init ip_rt_do_proc_init(struct net *net)
 {
 	struct proc_dir_entry *pde;
 
-	pde = proc_net_fops_create(net, "rt_cache", S_IRUGO,
-			&rt_cache_seq_fops);
+	pde = proc_create("rt_cache", S_IRUGO, net->proc_net,
+			  &rt_cache_seq_fops);
 	if (!pde)
 		goto err1;
 
@@ -749,10 +745,15 @@ static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buf
 {
 	struct rtable *rt;
 	struct flowi4 fl4;
+	const struct iphdr *iph = (const struct iphdr *) skb->data;
+	int oif = skb->dev->ifindex;
+	u8 tos = RT_TOS(iph->tos);
+	u8 prot = iph->protocol;
+	u32 mark = skb->mark;
 
 	rt = (struct rtable *) dst;
 
-	ip_rt_build_flow_key(&fl4, sk, skb);
+	__build_flow_key(&fl4, sk, iph, oif, tos, prot, mark, 0);
 	__ip_do_redirect(rt, skb, &fl4, true);
 }
 
@@ -2331,7 +2332,7 @@ nla_put_failure:
 	return -EMSGSIZE;
 }
 
-static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
+static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 {
 	struct net *net = sock_net(in_skb->sk);
 	struct rtmsg *rtm;
@@ -2439,6 +2440,11 @@ void ip_rt_multicast_event(struct in_device *in_dev)
 }
 
 #ifdef CONFIG_SYSCTL
+static int ip_rt_gc_timeout __read_mostly	= RT_GC_TIMEOUT;
+static int ip_rt_gc_interval __read_mostly  = 60 * HZ;
+static int ip_rt_gc_min_interval __read_mostly	= HZ / 2;
+static int ip_rt_gc_elasticity __read_mostly	= 8;
+
 static int ipv4_sysctl_rtcache_flush(ctl_table *__ctl, int write,
 					void __user *buffer,
 					size_t *lenp, loff_t *ppos)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index b236ef0..b05c96e 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -232,7 +232,8 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
  *
  * return false if we decode an option that should not be.
  */
-bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
+bool cookie_check_timestamp(struct tcp_options_received *tcp_opt,
+			struct net *net, bool *ecn_ok)
 {
 	/* echoed timestamp, lowest bits contain options */
 	u32 options = tcp_opt->rcv_tsecr & TSMASK;
@@ -247,7 +248,7 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
 
 	tcp_opt->sack_ok = (options & (1 << 4)) ? TCP_SACK_SEEN : 0;
 	*ecn_ok = (options >> 5) & 1;
-	if (*ecn_ok && !sysctl_tcp_ecn)
+	if (*ecn_ok && !net->ipv4.sysctl_tcp_ecn)
 		return false;
 
 	if (tcp_opt->sack_ok && !sysctl_tcp_sack)
@@ -266,7 +267,6 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 			     struct ip_options *opt)
 {
 	struct tcp_options_received tcp_opt;
-	const u8 *hash_location;
 	struct inet_request_sock *ireq;
 	struct tcp_request_sock *treq;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -293,9 +293,9 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 
 	/* check for timestamp cookie support */
 	memset(&tcp_opt, 0, sizeof(tcp_opt));
-	tcp_parse_options(skb, &tcp_opt, &hash_location, 0, NULL);
+	tcp_parse_options(skb, &tcp_opt, 0, NULL);
 
-	if (!cookie_check_timestamp(&tcp_opt, &ecn_ok))
+	if (!cookie_check_timestamp(&tcp_opt, sock_net(sk), &ecn_ok))
 		goto out;
 
 	ret = NULL;
@@ -348,8 +348,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
 	 * hasn't changed since we received the original syn, but I see
 	 * no easy way to do this.
 	 */
-	flowi4_init_output(&fl4, 0, sk->sk_mark, RT_CONN_FLAGS(sk),
-			   RT_SCOPE_UNIVERSE, IPPROTO_TCP,
+	flowi4_init_output(&fl4, sk->sk_bound_dev_if, sk->sk_mark,
+			   RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, IPPROTO_TCP,
 			   inet_sk_flowi_flags(sk),
 			   (opt && opt->srr) ? opt->faddr : ireq->rmt_addr,
 			   ireq->loc_addr, th->source, th->dest);
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index d84400b..fa2f63f 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -27,7 +27,8 @@
 #include <net/tcp_memcontrol.h>
 
 static int zero;
-static int two = 2;
+static int one = 1;
+static int four = 4;
 static int tcp_retr1_max = 255;
 static int ip_local_port_range_min[] = { 1, 1 };
 static int ip_local_port_range_max[] = { 65535, 65535 };
@@ -232,8 +233,8 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write,
 	return 0;
 }
 
-int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
-			  size_t *lenp, loff_t *ppos)
+static int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
+				 size_t *lenp, loff_t *ppos)
 {
 	ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 	struct tcp_fastopen_context *ctxt;
@@ -538,13 +539,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_dointvec
 	},
 	{
-		.procname	= "tcp_ecn",
-		.data		= &sysctl_tcp_ecn,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-	{
 		.procname	= "tcp_dsack",
 		.data		= &sysctl_tcp_dsack,
 		.maxlen		= sizeof(int),
@@ -556,14 +550,16 @@ static struct ctl_table ipv4_table[] = {
 		.data		= &sysctl_tcp_wmem,
 		.maxlen		= sizeof(sysctl_tcp_wmem),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &one,
 	},
 	{
 		.procname	= "tcp_rmem",
 		.data		= &sysctl_tcp_rmem,
 		.maxlen		= sizeof(sysctl_tcp_rmem),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &one,
 	},
 	{
 		.procname	= "tcp_app_win",
@@ -596,13 +592,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_dointvec
 	},
 	{
-		.procname	= "tcp_frto_response",
-		.data		= &sysctl_tcp_frto_response,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-	{
 		.procname	= "tcp_low_latency",
 		.data		= &sysctl_tcp_low_latency,
 		.maxlen		= sizeof(int),
@@ -637,13 +626,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_tcp_congestion_control,
 	},
 	{
-		.procname	= "tcp_abc",
-		.data		= &sysctl_tcp_abc,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-	{
 		.procname	= "tcp_mtu_probing",
 		.data		= &sysctl_tcp_mtu_probing,
 		.maxlen		= sizeof(int),
@@ -744,13 +726,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 	{
-		.procname	= "tcp_cookie_size",
-		.data		= &sysctl_tcp_cookie_size,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec
-	},
-	{
 		.procname       = "tcp_thin_linear_timeouts",
 		.data           = &sysctl_tcp_thin_linear_timeouts,
 		.maxlen         = sizeof(int),
@@ -771,7 +746,7 @@ static struct ctl_table ipv4_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= &zero,
-		.extra2		= &two,
+		.extra2		= &four,
 	},
 	{
 		.procname	= "udp_mem",
@@ -786,7 +761,7 @@ static struct ctl_table ipv4_table[] = {
 		.maxlen		= sizeof(sysctl_udp_rmem_min),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero
+		.extra1		= &one
 	},
 	{
 		.procname	= "udp_wmem_min",
@@ -794,7 +769,7 @@ static struct ctl_table ipv4_table[] = {
 		.maxlen		= sizeof(sysctl_udp_wmem_min),
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero
+		.extra1		= &one
 	},
 	{ }
 };
@@ -850,6 +825,13 @@ static struct ctl_table ipv4_net_table[] = {
 		.proc_handler	= ipv4_ping_group_range,
 	},
 	{
+		.procname	= "tcp_ecn",
+		.data		= &init_net.ipv4.sysctl_tcp_ecn,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+	{
 		.procname	= "tcp_mem",
 		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_mem),
 		.mode		= 0644,
@@ -882,6 +864,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
 			&net->ipv4.sysctl_icmp_ratemask;
 		table[6].data =
 			&net->ipv4.sysctl_ping_group_range;
+		table[7].data =
+			&net->ipv4.sysctl_tcp_ecn;
 
 		/* Don't export sysctls to unprivileged users */
 		if (net->user_ns != &init_user_ns)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2aa69c8..ab450c0 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -400,6 +400,8 @@ void tcp_init_sock(struct sock *sk)
 	tcp_enable_early_retrans(tp);
 	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
 
+	tp->tsoffset = 0;
+
 	sk->sk_state = TCP_CLOSE;
 
 	sk->sk_write_space = sk_stream_write_space;
@@ -407,15 +409,6 @@ void tcp_init_sock(struct sock *sk)
 
 	icsk->icsk_sync_mss = tcp_sync_mss;
 
-	/* TCP Cookie Transactions */
-	if (sysctl_tcp_cookie_size > 0) {
-		/* Default, cookies without s_data_payload. */
-		tp->cookie_values =
-			kzalloc(sizeof(*tp->cookie_values),
-				sk->sk_allocation);
-		if (tp->cookie_values != NULL)
-			kref_init(&tp->cookie_values->kref);
-	}
 	/* Presumed zeroed, in order of appearance:
 	 *	cookie_in_always, cookie_out_never,
 	 *	s_data_constant, s_data_in, s_data_out
@@ -773,7 +766,7 @@ struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp)
 			 * Make sure that we have exactly size bytes
 			 * available to the caller, no more, no less.
 			 */
-			skb->avail_size = size;
+			skb->reserved_tailroom = skb->end - skb->tail - size;
 			return skb;
 		}
 		__kfree_skb(skb);
@@ -895,6 +888,7 @@ new_segment:
 			get_page(page);
 			skb_fill_page_desc(skb, i, page, offset, copy);
 		}
+		skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
 
 		skb->len += copy;
 		skb->data_len += copy;
@@ -1406,10 +1400,10 @@ static void tcp_service_net_dma(struct sock *sk, bool wait)
 		return;
 
 	last_issued = tp->ucopy.dma_cookie;
-	dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+	dma_async_issue_pending(tp->ucopy.dma_chan);
 
 	do {
-		if (dma_async_memcpy_complete(tp->ucopy.dma_chan,
+		if (dma_async_is_tx_complete(tp->ucopy.dma_chan,
 					      last_issued, &done,
 					      &used) == DMA_SUCCESS) {
 			/* Safe to free early-copied skbs now */
@@ -1751,7 +1745,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 				tcp_service_net_dma(sk, true);
 				tcp_cleanup_rbuf(sk, copied);
 			} else
-				dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+				dma_async_issue_pending(tp->ucopy.dma_chan);
 		}
 #endif
 		if (copied >= target) {
@@ -1844,7 +1838,7 @@ do_prequeue:
 					break;
 				}
 
-				dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+				dma_async_issue_pending(tp->ucopy.dma_chan);
 
 				if ((offset + used) == skb->len)
 					copied_early = true;
@@ -2287,7 +2281,6 @@ int tcp_disconnect(struct sock *sk, int flags)
 	tp->packets_out = 0;
 	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	tp->snd_cwnd_cnt = 0;
-	tp->bytes_acked = 0;
 	tp->window_clamp = 0;
 	tcp_set_ca_state(sk, TCP_CA_Open);
 	tcp_clear_retrans(tp);
@@ -2395,92 +2388,6 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		release_sock(sk);
 		return err;
 	}
-	case TCP_COOKIE_TRANSACTIONS: {
-		struct tcp_cookie_transactions ctd;
-		struct tcp_cookie_values *cvp = NULL;
-
-		if (sizeof(ctd) > optlen)
-			return -EINVAL;
-		if (copy_from_user(&ctd, optval, sizeof(ctd)))
-			return -EFAULT;
-
-		if (ctd.tcpct_used > sizeof(ctd.tcpct_value) ||
-		    ctd.tcpct_s_data_desired > TCP_MSS_DESIRED)
-			return -EINVAL;
-
-		if (ctd.tcpct_cookie_desired == 0) {
-			/* default to global value */
-		} else if ((0x1 & ctd.tcpct_cookie_desired) ||
-			   ctd.tcpct_cookie_desired > TCP_COOKIE_MAX ||
-			   ctd.tcpct_cookie_desired < TCP_COOKIE_MIN) {
-			return -EINVAL;
-		}
-
-		if (TCP_COOKIE_OUT_NEVER & ctd.tcpct_flags) {
-			/* Supercedes all other values */
-			lock_sock(sk);
-			if (tp->cookie_values != NULL) {
-				kref_put(&tp->cookie_values->kref,
-					 tcp_cookie_values_release);
-				tp->cookie_values = NULL;
-			}
-			tp->rx_opt.cookie_in_always = 0; /* false */
-			tp->rx_opt.cookie_out_never = 1; /* true */
-			release_sock(sk);
-			return err;
-		}
-
-		/* Allocate ancillary memory before locking.
-		 */
-		if (ctd.tcpct_used > 0 ||
-		    (tp->cookie_values == NULL &&
-		     (sysctl_tcp_cookie_size > 0 ||
-		      ctd.tcpct_cookie_desired > 0 ||
-		      ctd.tcpct_s_data_desired > 0))) {
-			cvp = kzalloc(sizeof(*cvp) + ctd.tcpct_used,
-				      GFP_KERNEL);
-			if (cvp == NULL)
-				return -ENOMEM;
-
-			kref_init(&cvp->kref);
-		}
-		lock_sock(sk);
-		tp->rx_opt.cookie_in_always =
-			(TCP_COOKIE_IN_ALWAYS & ctd.tcpct_flags);
-		tp->rx_opt.cookie_out_never = 0; /* false */
-
-		if (tp->cookie_values != NULL) {
-			if (cvp != NULL) {
-				/* Changed values are recorded by a changed
-				 * pointer, ensuring the cookie will differ,
-				 * without separately hashing each value later.
-				 */
-				kref_put(&tp->cookie_values->kref,
-					 tcp_cookie_values_release);
-			} else {
-				cvp = tp->cookie_values;
-			}
-		}
-
-		if (cvp != NULL) {
-			cvp->cookie_desired = ctd.tcpct_cookie_desired;
-
-			if (ctd.tcpct_used > 0) {
-				memcpy(cvp->s_data_payload, ctd.tcpct_value,
-				       ctd.tcpct_used);
-				cvp->s_data_desired = ctd.tcpct_used;
-				cvp->s_data_constant = 1; /* true */
-			} else {
-				/* No constant payload data. */
-				cvp->s_data_desired = ctd.tcpct_s_data_desired;
-				cvp->s_data_constant = 0; /* false */
-			}
-
-			tp->cookie_values = cvp;
-		}
-		release_sock(sk);
-		return err;
-	}
 	default:
 		/* fallthru */
 		break;
@@ -2711,6 +2618,12 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		else
 			err = -EINVAL;
 		break;
+	case TCP_TIMESTAMP:
+		if (!tp->repair)
+			err = -EPERM;
+		else
+			tp->tsoffset = val - tcp_time_stamp;
+		break;
 	default:
 		err = -ENOPROTOOPT;
 		break;
@@ -2894,41 +2807,6 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 			return -EFAULT;
 		return 0;
 
-	case TCP_COOKIE_TRANSACTIONS: {
-		struct tcp_cookie_transactions ctd;
-		struct tcp_cookie_values *cvp = tp->cookie_values;
-
-		if (get_user(len, optlen))
-			return -EFAULT;
-		if (len < sizeof(ctd))
-			return -EINVAL;
-
-		memset(&ctd, 0, sizeof(ctd));
-		ctd.tcpct_flags = (tp->rx_opt.cookie_in_always ?
-				   TCP_COOKIE_IN_ALWAYS : 0)
-				| (tp->rx_opt.cookie_out_never ?
-				   TCP_COOKIE_OUT_NEVER : 0);
-
-		if (cvp != NULL) {
-			ctd.tcpct_flags |= (cvp->s_data_in ?
-					    TCP_S_DATA_IN : 0)
-					 | (cvp->s_data_out ?
-					    TCP_S_DATA_OUT : 0);
-
-			ctd.tcpct_cookie_desired = cvp->cookie_desired;
-			ctd.tcpct_s_data_desired = cvp->s_data_desired;
-
-			memcpy(&ctd.tcpct_value[0], &cvp->cookie_pair[0],
-			       cvp->cookie_pair_size);
-			ctd.tcpct_used = cvp->cookie_pair_size;
-		}
-
-		if (put_user(sizeof(ctd), optlen))
-			return -EFAULT;
-		if (copy_to_user(optval, &ctd, sizeof(ctd)))
-			return -EFAULT;
-		return 0;
-	}
 	case TCP_THIN_LINEAR_TIMEOUTS:
 		val = tp->thin_lto;
 		break;
@@ -2959,6 +2837,9 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 	case TCP_USER_TIMEOUT:
 		val = jiffies_to_msecs(icsk->icsk_user_timeout);
 		break;
+	case TCP_TIMESTAMP:
+		val = tcp_time_stamp + tp->tsoffset;
+		break;
 	default:
 		return -ENOPROTOOPT;
 	}
@@ -3004,6 +2885,9 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
 	__be32 delta;
 	unsigned int oldlen;
 	unsigned int mss;
+	struct sk_buff *gso_skb = skb;
+	__sum16 newcheck;
+	bool ooo_okay, copy_destructor;
 
 	if (!pskb_may_pull(skb, sizeof(*th)))
 		goto out;
@@ -3032,6 +2916,8 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
 			       SKB_GSO_DODGY |
 			       SKB_GSO_TCP_ECN |
 			       SKB_GSO_TCPV6 |
+			       SKB_GSO_GRE |
+			       SKB_GSO_UDP_TUNNEL |
 			       0) ||
 			     !(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))))
 			goto out;
@@ -3042,27 +2928,48 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
 		goto out;
 	}
 
+	copy_destructor = gso_skb->destructor == tcp_wfree;
+	ooo_okay = gso_skb->ooo_okay;
+	/* All segments but the first should have ooo_okay cleared */
+	skb->ooo_okay = 0;
+
 	segs = skb_segment(skb, features);
 	if (IS_ERR(segs))
 		goto out;
 
+	/* Only first segment might have ooo_okay set */
+	segs->ooo_okay = ooo_okay;
+
 	delta = htonl(oldlen + (thlen + mss));
 
 	skb = segs;
 	th = tcp_hdr(skb);
 	seq = ntohl(th->seq);
 
+	newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
+					       (__force u32)delta));
+
 	do {
 		th->fin = th->psh = 0;
+		th->check = newcheck;
 
-		th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
-				       (__force u32)delta));
 		if (skb->ip_summed != CHECKSUM_PARTIAL)
 			th->check =
 			     csum_fold(csum_partial(skb_transport_header(skb),
 						    thlen, skb->csum));
 
 		seq += mss;
+		if (copy_destructor) {
+			skb->destructor = gso_skb->destructor;
+			skb->sk = gso_skb->sk;
+			/* {tcp|sock}_wfree() use exact truesize accounting :
+			 * sum(skb->truesize) MUST be exactly be gso_skb->truesize
+			 * So we account mss bytes of 'true size' for each segment.
+			 * The last segment will contain the remaining.
+			 */
+			skb->truesize = mss;
+			gso_skb->truesize -= mss;
+		}
 		skb = skb->next;
 		th = tcp_hdr(skb);
 
@@ -3070,6 +2977,17 @@ struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
 		th->cwr = 0;
 	} while (skb->next);
 
+	/* Following permits TCP Small Queues to work well with GSO :
+	 * The callback to TCP stack will be called at the time last frag
+	 * is freed at TX completion, and not right now when gso_skb
+	 * is freed by GSO engine
+	 */
+	if (copy_destructor) {
+		swap(gso_skb->sk, skb->sk);
+		swap(gso_skb->destructor, skb->destructor);
+		swap(gso_skb->truesize, skb->truesize);
+	}
+
 	delta = htonl(oldlen + (skb->tail - skb->transport_header) +
 		      skb->data_len);
 	th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
@@ -3243,7 +3161,7 @@ __tcp_alloc_md5sig_pool(struct sock *sk)
 		struct crypto_hash *hash;
 
 		hash = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
-		if (!hash || IS_ERR(hash))
+		if (IS_ERR_OR_NULL(hash))
 			goto out_free;
 
 		per_cpu_ptr(pool, cpu)->md5_desc.tfm = hash;
@@ -3371,8 +3289,11 @@ int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
 
 	for (i = 0; i < shi->nr_frags; ++i) {
 		const struct skb_frag_struct *f = &shi->frags[i];
-		struct page *page = skb_frag_page(f);
-		sg_set_page(&sg, page, skb_frag_size(f), f->page_offset);
+		unsigned int offset = f->page_offset;
+		struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT);
+
+		sg_set_page(&sg, page, skb_frag_size(f),
+			    offset_in_page(offset));
 		if (crypto_hash_update(desc, &sg, skb_frag_size(f)))
 			return 1;
 	}
@@ -3396,134 +3317,6 @@ EXPORT_SYMBOL(tcp_md5_hash_key);
 
 #endif
 
-/* Each Responder maintains up to two secret values concurrently for
- * efficient secret rollover.  Each secret value has 4 states:
- *
- * Generating.  (tcp_secret_generating != tcp_secret_primary)
- *    Generates new Responder-Cookies, but not yet used for primary
- *    verification.  This is a short-term state, typically lasting only
- *    one round trip time (RTT).
- *
- * Primary.  (tcp_secret_generating == tcp_secret_primary)
- *    Used both for generation and primary verification.
- *
- * Retiring.  (tcp_secret_retiring != tcp_secret_secondary)
- *    Used for verification, until the first failure that can be
- *    verified by the newer Generating secret.  At that time, this
- *    cookie's state is changed to Secondary, and the Generating
- *    cookie's state is changed to Primary.  This is a short-term state,
- *    typically lasting only one round trip time (RTT).
- *
- * Secondary.  (tcp_secret_retiring == tcp_secret_secondary)
- *    Used for secondary verification, after primary verification
- *    failures.  This state lasts no more than twice the Maximum Segment
- *    Lifetime (2MSL).  Then, the secret is discarded.
- */
-struct tcp_cookie_secret {
-	/* The secret is divided into two parts.  The digest part is the
-	 * equivalent of previously hashing a secret and saving the state,
-	 * and serves as an initialization vector (IV).  The message part
-	 * serves as the trailing secret.
-	 */
-	u32				secrets[COOKIE_WORKSPACE_WORDS];
-	unsigned long			expires;
-};
-
-#define TCP_SECRET_1MSL (HZ * TCP_PAWS_MSL)
-#define TCP_SECRET_2MSL (HZ * TCP_PAWS_MSL * 2)
-#define TCP_SECRET_LIFE (HZ * 600)
-
-static struct tcp_cookie_secret tcp_secret_one;
-static struct tcp_cookie_secret tcp_secret_two;
-
-/* Essentially a circular list, without dynamic allocation. */
-static struct tcp_cookie_secret *tcp_secret_generating;
-static struct tcp_cookie_secret *tcp_secret_primary;
-static struct tcp_cookie_secret *tcp_secret_retiring;
-static struct tcp_cookie_secret *tcp_secret_secondary;
-
-static DEFINE_SPINLOCK(tcp_secret_locker);
-
-/* Select a pseudo-random word in the cookie workspace.
- */
-static inline u32 tcp_cookie_work(const u32 *ws, const int n)
-{
-	return ws[COOKIE_DIGEST_WORDS + ((COOKIE_MESSAGE_WORDS-1) & ws[n])];
-}
-
-/* Fill bakery[COOKIE_WORKSPACE_WORDS] with generator, updating as needed.
- * Called in softirq context.
- * Returns: 0 for success.
- */
-int tcp_cookie_generator(u32 *bakery)
-{
-	unsigned long jiffy = jiffies;
-
-	if (unlikely(time_after_eq(jiffy, tcp_secret_generating->expires))) {
-		spin_lock_bh(&tcp_secret_locker);
-		if (!time_after_eq(jiffy, tcp_secret_generating->expires)) {
-			/* refreshed by another */
-			memcpy(bakery,
-			       &tcp_secret_generating->secrets[0],
-			       COOKIE_WORKSPACE_WORDS);
-		} else {
-			/* still needs refreshing */
-			get_random_bytes(bakery, COOKIE_WORKSPACE_WORDS);
-
-			/* The first time, paranoia assumes that the
-			 * randomization function isn't as strong.  But,
-			 * this secret initialization is delayed until
-			 * the last possible moment (packet arrival).
-			 * Although that time is observable, it is
-			 * unpredictably variable.  Mash in the most
-			 * volatile clock bits available, and expire the
-			 * secret extra quickly.
-			 */
-			if (unlikely(tcp_secret_primary->expires ==
-				     tcp_secret_secondary->expires)) {
-				struct timespec tv;
-
-				getnstimeofday(&tv);
-				bakery[COOKIE_DIGEST_WORDS+0] ^=
-					(u32)tv.tv_nsec;
-
-				tcp_secret_secondary->expires = jiffy
-					+ TCP_SECRET_1MSL
-					+ (0x0f & tcp_cookie_work(bakery, 0));
-			} else {
-				tcp_secret_secondary->expires = jiffy
-					+ TCP_SECRET_LIFE
-					+ (0xff & tcp_cookie_work(bakery, 1));
-				tcp_secret_primary->expires = jiffy
-					+ TCP_SECRET_2MSL
-					+ (0x1f & tcp_cookie_work(bakery, 2));
-			}
-			memcpy(&tcp_secret_secondary->secrets[0],
-			       bakery, COOKIE_WORKSPACE_WORDS);
-
-			rcu_assign_pointer(tcp_secret_generating,
-					   tcp_secret_secondary);
-			rcu_assign_pointer(tcp_secret_retiring,
-					   tcp_secret_primary);
-			/*
-			 * Neither call_rcu() nor synchronize_rcu() needed.
-			 * Retiring data is not freed.  It is replaced after
-			 * further (locked) pointer updates, and a quiet time
-			 * (minimum 1MSL, maximum LIFE - 2MSL).
-			 */
-		}
-		spin_unlock_bh(&tcp_secret_locker);
-	} else {
-		rcu_read_lock_bh();
-		memcpy(bakery,
-		       &rcu_dereference(tcp_secret_generating)->secrets[0],
-		       COOKIE_WORKSPACE_WORDS);
-		rcu_read_unlock_bh();
-	}
-	return 0;
-}
-EXPORT_SYMBOL(tcp_cookie_generator);
-
 void tcp_done(struct sock *sk)
 {
 	struct request_sock *req = tcp_sk(sk)->fastopen_rsk;
@@ -3578,7 +3371,6 @@ void __init tcp_init(void)
 	unsigned long limit;
 	int max_rshare, max_wshare, cnt;
 	unsigned int i;
-	unsigned long jiffy = jiffies;
 
 	BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb));
 
@@ -3654,13 +3446,5 @@ void __init tcp_init(void)
 
 	tcp_register_congestion_control(&tcp_reno);
 
-	memset(&tcp_secret_one.secrets[0], 0, sizeof(tcp_secret_one.secrets));
-	memset(&tcp_secret_two.secrets[0], 0, sizeof(tcp_secret_two.secrets));
-	tcp_secret_one.expires = jiffy; /* past due */
-	tcp_secret_two.expires = jiffy; /* past due */
-	tcp_secret_generating = &tcp_secret_one;
-	tcp_secret_primary = &tcp_secret_one;
-	tcp_secret_retiring = &tcp_secret_two;
-	tcp_secret_secondary = &tcp_secret_two;
 	tcp_tasklet_init();
 }
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index cdf2e70..019c238 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -317,28 +317,11 @@ void tcp_slow_start(struct tcp_sock *tp)
 		snd_cwnd = 1U;
 	}
 
-	/* RFC3465: ABC Slow start
-	 * Increase only after a full MSS of bytes is acked
-	 *
-	 * TCP sender SHOULD increase cwnd by the number of
-	 * previously unacknowledged bytes ACKed by each incoming
-	 * acknowledgment, provided the increase is not more than L
-	 */
-	if (sysctl_tcp_abc && tp->bytes_acked < tp->mss_cache)
-		return;
-
 	if (sysctl_tcp_max_ssthresh > 0 && tp->snd_cwnd > sysctl_tcp_max_ssthresh)
 		cnt = sysctl_tcp_max_ssthresh >> 1;	/* limited slow start */
 	else
 		cnt = snd_cwnd;				/* exponential increase */
 
-	/* RFC3465: ABC
-	 * We MAY increase by 2 if discovered delayed ack
-	 */
-	if (sysctl_tcp_abc > 1 && tp->bytes_acked >= 2*tp->mss_cache)
-		cnt <<= 1;
-	tp->bytes_acked = 0;
-
 	tp->snd_cwnd_cnt += cnt;
 	while (tp->snd_cwnd_cnt >= snd_cwnd) {
 		tp->snd_cwnd_cnt -= snd_cwnd;
@@ -378,20 +361,9 @@ void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
 	/* In "safe" area, increase. */
 	if (tp->snd_cwnd <= tp->snd_ssthresh)
 		tcp_slow_start(tp);
-
 	/* In dangerous area, increase slowly. */
-	else if (sysctl_tcp_abc) {
-		/* RFC3465: Appropriate Byte Count
-		 * increase once for each full cwnd acked
-		 */
-		if (tp->bytes_acked >= tp->snd_cwnd*tp->mss_cache) {
-			tp->bytes_acked -= tp->snd_cwnd*tp->mss_cache;
-			if (tp->snd_cwnd < tp->snd_cwnd_clamp)
-				tp->snd_cwnd++;
-		}
-	} else {
+	else
 		tcp_cong_avoid_ai(tp, tp->snd_cwnd);
-	}
 }
 EXPORT_SYMBOL_GPL(tcp_reno_cong_avoid);
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ad70a96..9c62257 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -81,8 +81,6 @@ int sysctl_tcp_sack __read_mostly = 1;
 int sysctl_tcp_fack __read_mostly = 1;
 int sysctl_tcp_reordering __read_mostly = TCP_FASTRETRANS_THRESH;
 EXPORT_SYMBOL(sysctl_tcp_reordering);
-int sysctl_tcp_ecn __read_mostly = 2;
-EXPORT_SYMBOL(sysctl_tcp_ecn);
 int sysctl_tcp_dsack __read_mostly = 1;
 int sysctl_tcp_app_win __read_mostly = 31;
 int sysctl_tcp_adv_win_scale __read_mostly = 1;
@@ -95,13 +93,11 @@ int sysctl_tcp_stdurg __read_mostly;
 int sysctl_tcp_rfc1337 __read_mostly;
 int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
 int sysctl_tcp_frto __read_mostly = 2;
-int sysctl_tcp_frto_response __read_mostly;
 
 int sysctl_tcp_thin_dupack __read_mostly;
 
 int sysctl_tcp_moderate_rcvbuf __read_mostly = 1;
-int sysctl_tcp_abc __read_mostly;
-int sysctl_tcp_early_retrans __read_mostly = 2;
+int sysctl_tcp_early_retrans __read_mostly = 3;
 
 #define FLAG_DATA		0x01 /* Incoming frame contained data.		*/
 #define FLAG_WIN_UPDATE		0x02 /* Incoming ACK was a window update.	*/
@@ -111,17 +107,16 @@ int sysctl_tcp_early_retrans __read_mostly = 2;
 #define FLAG_DATA_SACKED	0x20 /* New SACK.				*/
 #define FLAG_ECE		0x40 /* ECE in this ACK				*/
 #define FLAG_SLOWPATH		0x100 /* Do not skip RFC checks for window update.*/
-#define FLAG_ONLY_ORIG_SACKED	0x200 /* SACKs only non-rexmit sent before RTO */
+#define FLAG_ORIG_SACK_ACKED	0x200 /* Never retransmitted data are (s)acked	*/
 #define FLAG_SND_UNA_ADVANCED	0x400 /* Snd_una was changed (!= FLAG_DATA_ACKED) */
 #define FLAG_DSACKING_ACK	0x800 /* SACK blocks contained D-SACK info */
-#define FLAG_NONHEAD_RETRANS_ACKED	0x1000 /* Non-head rexmitted data was ACKed */
 #define FLAG_SACK_RENEGING	0x2000 /* snd_una advanced to a sacked seq */
+#define FLAG_UPDATE_TS_RECENT	0x4000 /* tcp_replace_ts_recent() */
 
 #define FLAG_ACKED		(FLAG_DATA_ACKED|FLAG_SYN_ACKED)
 #define FLAG_NOT_DUP		(FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED)
 #define FLAG_CA_ALERT		(FLAG_DATA_SACKED|FLAG_ECE)
 #define FLAG_FORWARD_PROGRESS	(FLAG_ACKED|FLAG_DATA_SACKED)
-#define FLAG_ANY_PROGRESS	(FLAG_FORWARD_PROGRESS|FLAG_SND_UNA_ADVANCED)
 
 #define TCP_REMNANT (TCP_FLAG_FIN|TCP_FLAG_URG|TCP_FLAG_SYN|TCP_FLAG_PSH)
 #define TCP_HP_BITS (~(TCP_RESERVED_BITS|TCP_FLAG_PSH))
@@ -1162,10 +1157,8 @@ static u8 tcp_sacktag_one(struct sock *sk,
 					   tcp_highest_sack_seq(tp)))
 					state->reord = min(fack_count,
 							   state->reord);
-
-				/* SACK enhanced F-RTO (RFC4138; Appendix B) */
-				if (!after(end_seq, tp->frto_highmark))
-					state->flag |= FLAG_ONLY_ORIG_SACKED;
+				if (!after(end_seq, tp->high_seq))
+					state->flag |= FLAG_ORIG_SACK_ACKED;
 			}
 
 			if (sacked & TCPCB_LOST) {
@@ -1558,7 +1551,6 @@ static int
 tcp_sacktag_write_queue(struct sock *sk, const struct sk_buff *ack_skb,
 			u32 prior_snd_una)
 {
-	const struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	const unsigned char *ptr = (skb_transport_header(ack_skb) +
 				    TCP_SKB_CB(ack_skb)->sacked);
@@ -1731,12 +1723,6 @@ walk:
 				       start_seq, end_seq, dup_sack);
 
 advance_sp:
-		/* SACK enhanced FRTO (RFC4138, Appendix B): Clearing correct
-		 * due to in-order walk
-		 */
-		if (after(end_seq, tp->frto_highmark))
-			state.flag &= ~FLAG_ONLY_ORIG_SACKED;
-
 		i++;
 	}
 
@@ -1753,8 +1739,7 @@ advance_sp:
 	tcp_verify_left_out(tp);
 
 	if ((state.reord < tp->fackets_out) &&
-	    ((icsk->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker) &&
-	    (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark)))
+	    ((inet_csk(sk)->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker))
 		tcp_update_reordering(sk, tp->fackets_out - state.reord, 0);
 
 out:
@@ -1828,198 +1813,6 @@ static inline void tcp_reset_reno_sack(struct tcp_sock *tp)
 	tp->sacked_out = 0;
 }
 
-static int tcp_is_sackfrto(const struct tcp_sock *tp)
-{
-	return (sysctl_tcp_frto == 0x2) && !tcp_is_reno(tp);
-}
-
-/* F-RTO can only be used if TCP has never retransmitted anything other than
- * head (SACK enhanced variant from Appendix B of RFC4138 is more robust here)
- */
-bool tcp_use_frto(struct sock *sk)
-{
-	const struct tcp_sock *tp = tcp_sk(sk);
-	const struct inet_connection_sock *icsk = inet_csk(sk);
-	struct sk_buff *skb;
-
-	if (!sysctl_tcp_frto)
-		return false;
-
-	/* MTU probe and F-RTO won't really play nicely along currently */
-	if (icsk->icsk_mtup.probe_size)
-		return false;
-
-	if (tcp_is_sackfrto(tp))
-		return true;
-
-	/* Avoid expensive walking of rexmit queue if possible */
-	if (tp->retrans_out > 1)
-		return false;
-
-	skb = tcp_write_queue_head(sk);
-	if (tcp_skb_is_last(sk, skb))
-		return true;
-	skb = tcp_write_queue_next(sk, skb);	/* Skips head */
-	tcp_for_write_queue_from(skb, sk) {
-		if (skb == tcp_send_head(sk))
-			break;
-		if (TCP_SKB_CB(skb)->sacked & TCPCB_RETRANS)
-			return false;
-		/* Short-circuit when first non-SACKed skb has been checked */
-		if (!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
-			break;
-	}
-	return true;
-}
-
-/* RTO occurred, but do not yet enter Loss state. Instead, defer RTO
- * recovery a bit and use heuristics in tcp_process_frto() to detect if
- * the RTO was spurious. Only clear SACKED_RETRANS of the head here to
- * keep retrans_out counting accurate (with SACK F-RTO, other than head
- * may still have that bit set); TCPCB_LOST and remaining SACKED_RETRANS
- * bits are handled if the Loss state is really to be entered (in
- * tcp_enter_frto_loss).
- *
- * Do like tcp_enter_loss() would; when RTO expires the second time it
- * does:
- *  "Reduce ssthresh if it has not yet been made inside this window."
- */
-void tcp_enter_frto(struct sock *sk)
-{
-	const struct inet_connection_sock *icsk = inet_csk(sk);
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct sk_buff *skb;
-
-	if ((!tp->frto_counter && icsk->icsk_ca_state <= TCP_CA_Disorder) ||
-	    tp->snd_una == tp->high_seq ||
-	    ((icsk->icsk_ca_state == TCP_CA_Loss || tp->frto_counter) &&
-	     !icsk->icsk_retransmits)) {
-		tp->prior_ssthresh = tcp_current_ssthresh(sk);
-		/* Our state is too optimistic in ssthresh() call because cwnd
-		 * is not reduced until tcp_enter_frto_loss() when previous F-RTO
-		 * recovery has not yet completed. Pattern would be this: RTO,
-		 * Cumulative ACK, RTO (2xRTO for the same segment does not end
-		 * up here twice).
-		 * RFC4138 should be more specific on what to do, even though
-		 * RTO is quite unlikely to occur after the first Cumulative ACK
-		 * due to back-off and complexity of triggering events ...
-		 */
-		if (tp->frto_counter) {
-			u32 stored_cwnd;
-			stored_cwnd = tp->snd_cwnd;
-			tp->snd_cwnd = 2;
-			tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
-			tp->snd_cwnd = stored_cwnd;
-		} else {
-			tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
-		}
-		/* ... in theory, cong.control module could do "any tricks" in
-		 * ssthresh(), which means that ca_state, lost bits and lost_out
-		 * counter would have to be faked before the call occurs. We
-		 * consider that too expensive, unlikely and hacky, so modules
-		 * using these in ssthresh() must deal these incompatibility
-		 * issues if they receives CA_EVENT_FRTO and frto_counter != 0
-		 */
-		tcp_ca_event(sk, CA_EVENT_FRTO);
-	}
-
-	tp->undo_marker = tp->snd_una;
-	tp->undo_retrans = 0;
-
-	skb = tcp_write_queue_head(sk);
-	if (TCP_SKB_CB(skb)->sacked & TCPCB_RETRANS)
-		tp->undo_marker = 0;
-	if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
-		TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
-		tp->retrans_out -= tcp_skb_pcount(skb);
-	}
-	tcp_verify_left_out(tp);
-
-	/* Too bad if TCP was application limited */
-	tp->snd_cwnd = min(tp->snd_cwnd, tcp_packets_in_flight(tp) + 1);
-
-	/* Earlier loss recovery underway (see RFC4138; Appendix B).
-	 * The last condition is necessary at least in tp->frto_counter case.
-	 */
-	if (tcp_is_sackfrto(tp) && (tp->frto_counter ||
-	    ((1 << icsk->icsk_ca_state) & (TCPF_CA_Recovery|TCPF_CA_Loss))) &&
-	    after(tp->high_seq, tp->snd_una)) {
-		tp->frto_highmark = tp->high_seq;
-	} else {
-		tp->frto_highmark = tp->snd_nxt;
-	}
-	tcp_set_ca_state(sk, TCP_CA_Disorder);
-	tp->high_seq = tp->snd_nxt;
-	tp->frto_counter = 1;
-}
-
-/* Enter Loss state after F-RTO was applied. Dupack arrived after RTO,
- * which indicates that we should follow the traditional RTO recovery,
- * i.e. mark everything lost and do go-back-N retransmission.
- */
-static void tcp_enter_frto_loss(struct sock *sk, int allowed_segments, int flag)
-{
-	struct tcp_sock *tp = tcp_sk(sk);
-	struct sk_buff *skb;
-
-	tp->lost_out = 0;
-	tp->retrans_out = 0;
-	if (tcp_is_reno(tp))
-		tcp_reset_reno_sack(tp);
-
-	tcp_for_write_queue(skb, sk) {
-		if (skb == tcp_send_head(sk))
-			break;
-
-		TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST;
-		/*
-		 * Count the retransmission made on RTO correctly (only when
-		 * waiting for the first ACK and did not get it)...
-		 */
-		if ((tp->frto_counter == 1) && !(flag & FLAG_DATA_ACKED)) {
-			/* For some reason this R-bit might get cleared? */
-			if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
-				tp->retrans_out += tcp_skb_pcount(skb);
-			/* ...enter this if branch just for the first segment */
-			flag |= FLAG_DATA_ACKED;
-		} else {
-			if (TCP_SKB_CB(skb)->sacked & TCPCB_RETRANS)
-				tp->undo_marker = 0;
-			TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
-		}
-
-		/* Marking forward transmissions that were made after RTO lost
-		 * can cause unnecessary retransmissions in some scenarios,
-		 * SACK blocks will mitigate that in some but not in all cases.
-		 * We used to not mark them but it was causing break-ups with
-		 * receivers that do only in-order receival.
-		 *
-		 * TODO: we could detect presence of such receiver and select
-		 * different behavior per flow.
-		 */
-		if (!(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)) {
-			TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
-			tp->lost_out += tcp_skb_pcount(skb);
-			tp->retransmit_high = TCP_SKB_CB(skb)->end_seq;
-		}
-	}
-	tcp_verify_left_out(tp);
-
-	tp->snd_cwnd = tcp_packets_in_flight(tp) + allowed_segments;
-	tp->snd_cwnd_cnt = 0;
-	tp->snd_cwnd_stamp = tcp_time_stamp;
-	tp->frto_counter = 0;
-	tp->bytes_acked = 0;
-
-	tp->reordering = min_t(unsigned int, tp->reordering,
-			       sysctl_tcp_reordering);
-	tcp_set_ca_state(sk, TCP_CA_Loss);
-	tp->high_seq = tp->snd_nxt;
-	TCP_ECN_queue_cwr(tp);
-
-	tcp_clear_all_retrans_hints(tp);
-}
-
 static void tcp_clear_retrans_partial(struct tcp_sock *tp)
 {
 	tp->retrans_out = 0;
@@ -2046,10 +1839,13 @@ void tcp_enter_loss(struct sock *sk, int how)
 	const struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
+	bool new_recovery = false;
 
 	/* Reduce ssthresh if it has not yet been made inside this window. */
-	if (icsk->icsk_ca_state <= TCP_CA_Disorder || tp->snd_una == tp->high_seq ||
+	if (icsk->icsk_ca_state <= TCP_CA_Disorder ||
+	    !after(tp->high_seq, tp->snd_una) ||
 	    (icsk->icsk_ca_state == TCP_CA_Loss && !icsk->icsk_retransmits)) {
+		new_recovery = true;
 		tp->prior_ssthresh = tcp_current_ssthresh(sk);
 		tp->snd_ssthresh = icsk->icsk_ca_ops->ssthresh(sk);
 		tcp_ca_event(sk, CA_EVENT_LOSS);
@@ -2058,17 +1854,13 @@ void tcp_enter_loss(struct sock *sk, int how)
 	tp->snd_cwnd_cnt   = 0;
 	tp->snd_cwnd_stamp = tcp_time_stamp;
 
-	tp->bytes_acked = 0;
 	tcp_clear_retrans_partial(tp);
 
 	if (tcp_is_reno(tp))
 		tcp_reset_reno_sack(tp);
 
-	if (!how) {
-		/* Push undo marker, if it was plain RTO and nothing
-		 * was retransmitted. */
-		tp->undo_marker = tp->snd_una;
-	} else {
+	tp->undo_marker = tp->snd_una;
+	if (how) {
 		tp->sacked_out = 0;
 		tp->fackets_out = 0;
 	}
@@ -2095,8 +1887,14 @@ void tcp_enter_loss(struct sock *sk, int how)
 	tcp_set_ca_state(sk, TCP_CA_Loss);
 	tp->high_seq = tp->snd_nxt;
 	TCP_ECN_queue_cwr(tp);
-	/* Abort F-RTO algorithm if one is in progress */
-	tp->frto_counter = 0;
+
+	/* F-RTO RFC5682 sec 3.1 step 1: retransmit SND.UNA if no previous
+	 * loss recovery is underway except recurring timeout(s) on
+	 * the same SND.UNA (sec 3.2). Disable F-RTO on path MTU probing
+	 */
+	tp->frto = sysctl_tcp_frto &&
+		   (new_recovery || icsk->icsk_retransmits) &&
+		   !inet_csk(sk)->icsk_mtup.probe_size;
 }
 
 /* If ACK arrived pointing to a remembered SACK, it means that our
@@ -2155,15 +1953,16 @@ static bool tcp_pause_early_retransmit(struct sock *sk, int flag)
 	 * max(RTT/4, 2msec) unless ack has ECE mark, no RTT samples
 	 * available, or RTO is scheduled to fire first.
 	 */
-	if (sysctl_tcp_early_retrans < 2 || (flag & FLAG_ECE) || !tp->srtt)
+	if (sysctl_tcp_early_retrans < 2 || sysctl_tcp_early_retrans > 3 ||
+	    (flag & FLAG_ECE) || !tp->srtt)
 		return false;
 
 	delay = max_t(unsigned long, (tp->srtt >> 5), msecs_to_jiffies(2));
 	if (!time_after(inet_csk(sk)->icsk_timeout, (jiffies + delay)))
 		return false;
 
-	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, delay, TCP_RTO_MAX);
-	tp->early_retrans_delayed = 1;
+	inet_csk_reset_xmit_timer(sk, ICSK_TIME_EARLY_RETRANS, delay,
+				  TCP_RTO_MAX);
 	return true;
 }
 
@@ -2279,10 +2078,6 @@ static bool tcp_time_to_recover(struct sock *sk, int flag)
 	struct tcp_sock *tp = tcp_sk(sk);
 	__u32 packets_out;
 
-	/* Do not perform any recovery during F-RTO algorithm */
-	if (tp->frto_counter)
-		return false;
-
 	/* Trick#1: The loss is proven. */
 	if (tp->lost_out)
 		return true;
@@ -2326,7 +2121,7 @@ static bool tcp_time_to_recover(struct sock *sk, int flag)
 	 * interval if appropriate.
 	 */
 	if (tp->do_early_retrans && !tp->retrans_out && tp->sacked_out &&
-	    (tp->packets_out == (tp->sacked_out + 1) && tp->packets_out < 4) &&
+	    (tp->packets_out >= (tp->sacked_out + 1) && tp->packets_out < 4) &&
 	    !tcp_may_send_now(sk))
 		return !tcp_pause_early_retransmit(sk, flag);
 
@@ -2643,12 +2438,12 @@ static int tcp_try_undo_partial(struct sock *sk, int acked)
 	return failed;
 }
 
-/* Undo during loss recovery after partial ACK. */
-static bool tcp_try_undo_loss(struct sock *sk)
+/* Undo during loss recovery after partial ACK or using F-RTO. */
+static bool tcp_try_undo_loss(struct sock *sk, bool frto_undo)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (tcp_may_undo(tp)) {
+	if (frto_undo || tcp_may_undo(tp)) {
 		struct sk_buff *skb;
 		tcp_for_write_queue(skb, sk) {
 			if (skb == tcp_send_head(sk))
@@ -2662,9 +2457,12 @@ static bool tcp_try_undo_loss(struct sock *sk)
 		tp->lost_out = 0;
 		tcp_undo_cwr(sk, true);
 		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPLOSSUNDO);
+		if (frto_undo)
+			NET_INC_STATS_BH(sock_net(sk),
+					 LINUX_MIB_TCPSPURIOUSRTOS);
 		inet_csk(sk)->icsk_retransmits = 0;
 		tp->undo_marker = 0;
-		if (tcp_is_sack(tp))
+		if (frto_undo || tcp_is_sack(tp))
 			tcp_set_ca_state(sk, TCP_CA_Open);
 		return true;
 	}
@@ -2686,7 +2484,7 @@ static void tcp_init_cwnd_reduction(struct sock *sk, const bool set_ssthresh)
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	tp->high_seq = tp->snd_nxt;
-	tp->bytes_acked = 0;
+	tp->tlp_high_seq = 0;
 	tp->snd_cwnd_cnt = 0;
 	tp->prior_cwnd = tp->snd_cwnd;
 	tp->prr_delivered = 0;
@@ -2737,7 +2535,6 @@ void tcp_enter_cwr(struct sock *sk, const int set_ssthresh)
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	tp->prior_ssthresh = 0;
-	tp->bytes_acked = 0;
 	if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
 		tp->undo_marker = 0;
 		tcp_init_cwnd_reduction(sk, set_ssthresh);
@@ -2765,7 +2562,7 @@ static void tcp_try_to_open(struct sock *sk, int flag, int newly_acked_sacked)
 
 	tcp_verify_left_out(tp);
 
-	if (!tp->frto_counter && !tcp_any_retrans_done(sk))
+	if (!tcp_any_retrans_done(sk))
 		tp->retrans_stamp = 0;
 
 	if (flag & FLAG_ECE)
@@ -2882,6 +2679,58 @@ static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
 	tcp_set_ca_state(sk, TCP_CA_Recovery);
 }
 
+/* Process an ACK in CA_Loss state. Move to CA_Open if lost data are
+ * recovered or spurious. Otherwise retransmits more on partial ACKs.
+ */
+static void tcp_process_loss(struct sock *sk, int flag, bool is_dupack)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct tcp_sock *tp = tcp_sk(sk);
+	bool recovered = !before(tp->snd_una, tp->high_seq);
+
+	if (tp->frto) { /* F-RTO RFC5682 sec 3.1 (sack enhanced version). */
+		if (flag & FLAG_ORIG_SACK_ACKED) {
+			/* Step 3.b. A timeout is spurious if not all data are
+			 * lost, i.e., never-retransmitted data are (s)acked.
+			 */
+			tcp_try_undo_loss(sk, true);
+			return;
+		}
+		if (after(tp->snd_nxt, tp->high_seq) &&
+		    (flag & FLAG_DATA_SACKED || is_dupack)) {
+			tp->frto = 0; /* Loss was real: 2nd part of step 3.a */
+		} else if (flag & FLAG_SND_UNA_ADVANCED && !recovered) {
+			tp->high_seq = tp->snd_nxt;
+			__tcp_push_pending_frames(sk, tcp_current_mss(sk),
+						  TCP_NAGLE_OFF);
+			if (after(tp->snd_nxt, tp->high_seq))
+				return; /* Step 2.b */
+			tp->frto = 0;
+		}
+	}
+
+	if (recovered) {
+		/* F-RTO RFC5682 sec 3.1 step 2.a and 1st part of step 3.a */
+		icsk->icsk_retransmits = 0;
+		tcp_try_undo_recovery(sk);
+		return;
+	}
+	if (flag & FLAG_DATA_ACKED)
+		icsk->icsk_retransmits = 0;
+	if (tcp_is_reno(tp)) {
+		/* A Reno DUPACK means new data in F-RTO step 2.b above are
+		 * delivered. Lower inflight to clock out (re)tranmissions.
+		 */
+		if (after(tp->snd_nxt, tp->high_seq) && is_dupack)
+			tcp_add_reno_sack(sk);
+		else if (flag & FLAG_SND_UNA_ADVANCED)
+			tcp_reset_reno_sack(tp);
+	}
+	if (tcp_try_undo_loss(sk, false))
+		return;
+	tcp_xmit_retransmit_queue(sk);
+}
+
 /* Process an event, which can update packets-in-flight not trivially.
  * Main goal of this function is to calculate new estimate for left_out,
  * taking into account both packets sitting in receiver's buffer and
@@ -2894,8 +2743,8 @@ static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
  * tcp_xmit_retransmit_queue().
  */
 static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
-				  int prior_sacked, bool is_dupack,
-				  int flag)
+				  int prior_sacked, int prior_packets,
+				  bool is_dupack, int flag)
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -2928,12 +2777,6 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
 		tp->retrans_stamp = 0;
 	} else if (!before(tp->snd_una, tp->high_seq)) {
 		switch (icsk->icsk_ca_state) {
-		case TCP_CA_Loss:
-			icsk->icsk_retransmits = 0;
-			if (tcp_try_undo_recovery(sk))
-				return;
-			break;
-
 		case TCP_CA_CWR:
 			/* CWR is to be held something *above* high_seq
 			 * is ACKed for CWR bit to reach receiver. */
@@ -2961,21 +2804,14 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
 				tcp_add_reno_sack(sk);
 		} else
 			do_lost = tcp_try_undo_partial(sk, pkts_acked);
-		newly_acked_sacked = pkts_acked + tp->sacked_out - prior_sacked;
+		newly_acked_sacked = prior_packets - tp->packets_out +
+				     tp->sacked_out - prior_sacked;
 		break;
 	case TCP_CA_Loss:
-		if (flag & FLAG_DATA_ACKED)
-			icsk->icsk_retransmits = 0;
-		if (tcp_is_reno(tp) && flag & FLAG_SND_UNA_ADVANCED)
-			tcp_reset_reno_sack(tp);
-		if (!tcp_try_undo_loss(sk)) {
-			tcp_moderate_cwnd(tp);
-			tcp_xmit_retransmit_queue(sk);
-			return;
-		}
+		tcp_process_loss(sk, flag, is_dupack);
 		if (icsk->icsk_ca_state != TCP_CA_Open)
 			return;
-		/* Loss is undone; fall through to processing in Open state. */
+		/* Fall through to processing in Open state. */
 	default:
 		if (tcp_is_reno(tp)) {
 			if (flag & FLAG_SND_UNA_ADVANCED)
@@ -2983,7 +2819,8 @@ static void tcp_fastretrans_alert(struct sock *sk, int pkts_acked,
 			if (is_dupack)
 				tcp_add_reno_sack(sk);
 		}
-		newly_acked_sacked = pkts_acked + tp->sacked_out - prior_sacked;
+		newly_acked_sacked = prior_packets - tp->packets_out +
+				     tp->sacked_out - prior_sacked;
 
 		if (icsk->icsk_ca_state <= TCP_CA_Disorder)
 			tcp_try_undo_dsack(sk);
@@ -3088,6 +2925,7 @@ static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
  */
 void tcp_rearm_rto(struct sock *sk)
 {
+	const struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	/* If the retrans timer is currently being used by Fast Open
@@ -3101,12 +2939,13 @@ void tcp_rearm_rto(struct sock *sk)
 	} else {
 		u32 rto = inet_csk(sk)->icsk_rto;
 		/* Offset the time elapsed after installing regular RTO */
-		if (tp->early_retrans_delayed) {
+		if (icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+		    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 			struct sk_buff *skb = tcp_write_queue_head(sk);
 			const u32 rto_time_stamp = TCP_SKB_CB(skb)->when + rto;
 			s32 delta = (s32)(rto_time_stamp - tcp_time_stamp);
 			/* delta may not be positive if the socket is locked
-			 * when the delayed ER timer fires and is rescheduled.
+			 * when the retrans timer fires and is rescheduled.
 			 */
 			if (delta > 0)
 				rto = delta;
@@ -3114,7 +2953,6 @@ void tcp_rearm_rto(struct sock *sk)
 		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, rto,
 					  TCP_RTO_MAX);
 	}
-	tp->early_retrans_delayed = 0;
 }
 
 /* This function is called when the delayed ER timer fires. TCP enters
@@ -3202,8 +3040,6 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
 			flag |= FLAG_RETRANS_DATA_ACKED;
 			ca_seq_rtt = -1;
 			seq_rtt = -1;
-			if ((flag & FLAG_DATA_ACKED) || (acked_pcount > 1))
-				flag |= FLAG_NONHEAD_RETRANS_ACKED;
 		} else {
 			ca_seq_rtt = now - scb->when;
 			last_ackt = skb->tstamp;
@@ -3212,6 +3048,8 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets,
 			}
 			if (!(sacked & TCPCB_SACKED_ACKED))
 				reord = min(pkts_acked, reord);
+			if (!after(scb->end_seq, tp->high_seq))
+				flag |= FLAG_ORIG_SACK_ACKED;
 		}
 
 		if (sacked & TCPCB_SACKED_ACKED)
@@ -3412,166 +3250,74 @@ static int tcp_ack_update_window(struct sock *sk, const struct sk_buff *skb, u32
 	return flag;
 }
 
-/* A very conservative spurious RTO response algorithm: reduce cwnd and
- * continue in congestion avoidance.
- */
-static void tcp_conservative_spur_to_response(struct tcp_sock *tp)
+/* RFC 5961 7 [ACK Throttling] */
+static void tcp_send_challenge_ack(struct sock *sk)
 {
-	tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
-	tp->snd_cwnd_cnt = 0;
-	tp->bytes_acked = 0;
-	TCP_ECN_queue_cwr(tp);
-	tcp_moderate_cwnd(tp);
-}
+	/* unprotected vars, we dont care of overwrites */
+	static u32 challenge_timestamp;
+	static unsigned int challenge_count;
+	u32 now = jiffies / HZ;
 
-/* A conservative spurious RTO response algorithm: reduce cwnd using
- * PRR and continue in congestion avoidance.
- */
-static void tcp_cwr_spur_to_response(struct sock *sk)
-{
-	tcp_enter_cwr(sk, 0);
+	if (now != challenge_timestamp) {
+		challenge_timestamp = now;
+		challenge_count = 0;
+	}
+	if (++challenge_count <= sysctl_tcp_challenge_ack_limit) {
+		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPCHALLENGEACK);
+		tcp_send_ack(sk);
+	}
 }
 
-static void tcp_undo_spur_to_response(struct sock *sk, int flag)
+static void tcp_store_ts_recent(struct tcp_sock *tp)
 {
-	if (flag & FLAG_ECE)
-		tcp_cwr_spur_to_response(sk);
-	else
-		tcp_undo_cwr(sk, true);
+	tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval;
+	tp->rx_opt.ts_recent_stamp = get_seconds();
 }
 
-/* F-RTO spurious RTO detection algorithm (RFC4138)
- *
- * F-RTO affects during two new ACKs following RTO (well, almost, see inline
- * comments). State (ACK number) is kept in frto_counter. When ACK advances
- * window (but not to or beyond highest sequence sent before RTO):
- *   On First ACK,  send two new segments out.
- *   On Second ACK, RTO was likely spurious. Do spurious response (response
- *                  algorithm is not part of the F-RTO detection algorithm
- *                  given in RFC4138 but can be selected separately).
- * Otherwise (basically on duplicate ACK), RTO was (likely) caused by a loss
- * and TCP falls back to conventional RTO recovery. F-RTO allows overriding
- * of Nagle, this is done using frto_counter states 2 and 3, when a new data
- * segment of any size sent during F-RTO, state 2 is upgraded to 3.
- *
- * Rationale: if the RTO was spurious, new ACKs should arrive from the
- * original window even after we transmit two new data segments.
- *
- * SACK version:
- *   on first step, wait until first cumulative ACK arrives, then move to
- *   the second step. In second step, the next ACK decides.
- *
- * F-RTO is implemented (mainly) in four functions:
- *   - tcp_use_frto() is used to determine if TCP is can use F-RTO
- *   - tcp_enter_frto() prepares TCP state on RTO if F-RTO is used, it is
- *     called when tcp_use_frto() showed green light
- *   - tcp_process_frto() handles incoming ACKs during F-RTO algorithm
- *   - tcp_enter_frto_loss() is called if there is not enough evidence
- *     to prove that the RTO is indeed spurious. It transfers the control
- *     from F-RTO to the conventional RTO recovery
- */
-static bool tcp_process_frto(struct sock *sk, int flag)
+static void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
 {
-	struct tcp_sock *tp = tcp_sk(sk);
-
-	tcp_verify_left_out(tp);
-
-	/* Duplicate the behavior from Loss state (fastretrans_alert) */
-	if (flag & FLAG_DATA_ACKED)
-		inet_csk(sk)->icsk_retransmits = 0;
-
-	if ((flag & FLAG_NONHEAD_RETRANS_ACKED) ||
-	    ((tp->frto_counter >= 2) && (flag & FLAG_RETRANS_DATA_ACKED)))
-		tp->undo_marker = 0;
-
-	if (!before(tp->snd_una, tp->frto_highmark)) {
-		tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 2 : 3), flag);
-		return true;
-	}
-
-	if (!tcp_is_sackfrto(tp)) {
-		/* RFC4138 shortcoming in step 2; should also have case c):
-		 * ACK isn't duplicate nor advances window, e.g., opposite dir
-		 * data, winupdate
+	if (tp->rx_opt.saw_tstamp && !after(seq, tp->rcv_wup)) {
+		/* PAWS bug workaround wrt. ACK frames, the PAWS discard
+		 * extra check below makes sure this can only happen
+		 * for pure ACK frames.  -DaveM
+		 *
+		 * Not only, also it occurs for expired timestamps.
 		 */
-		if (!(flag & FLAG_ANY_PROGRESS) && (flag & FLAG_NOT_DUP))
-			return true;
-
-		if (!(flag & FLAG_DATA_ACKED)) {
-			tcp_enter_frto_loss(sk, (tp->frto_counter == 1 ? 0 : 3),
-					    flag);
-			return true;
-		}
-	} else {
-		if (!(flag & FLAG_DATA_ACKED) && (tp->frto_counter == 1)) {
-			if (!tcp_packets_in_flight(tp)) {
-				tcp_enter_frto_loss(sk, 2, flag);
-				return true;
-			}
-
-			/* Prevent sending of new data. */
-			tp->snd_cwnd = min(tp->snd_cwnd,
-					   tcp_packets_in_flight(tp));
-			return true;
-		}
-
-		if ((tp->frto_counter >= 2) &&
-		    (!(flag & FLAG_FORWARD_PROGRESS) ||
-		     ((flag & FLAG_DATA_SACKED) &&
-		      !(flag & FLAG_ONLY_ORIG_SACKED)))) {
-			/* RFC4138 shortcoming (see comment above) */
-			if (!(flag & FLAG_FORWARD_PROGRESS) &&
-			    (flag & FLAG_NOT_DUP))
-				return true;
-
-			tcp_enter_frto_loss(sk, 3, flag);
-			return true;
-		}
-	}
 
-	if (tp->frto_counter == 1) {
-		/* tcp_may_send_now needs to see updated state */
-		tp->snd_cwnd = tcp_packets_in_flight(tp) + 2;
-		tp->frto_counter = 2;
-
-		if (!tcp_may_send_now(sk))
-			tcp_enter_frto_loss(sk, 2, flag);
-
-		return true;
-	} else {
-		switch (sysctl_tcp_frto_response) {
-		case 2:
-			tcp_undo_spur_to_response(sk, flag);
-			break;
-		case 1:
-			tcp_conservative_spur_to_response(tp);
-			break;
-		default:
-			tcp_cwr_spur_to_response(sk);
-			break;
-		}
-		tp->frto_counter = 0;
-		tp->undo_marker = 0;
-		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSPURIOUSRTOS);
+		if (tcp_paws_check(&tp->rx_opt, 0))
+			tcp_store_ts_recent(tp);
 	}
-	return false;
 }
 
-/* RFC 5961 7 [ACK Throttling] */
-static void tcp_send_challenge_ack(struct sock *sk)
+/* This routine deals with acks during a TLP episode.
+ * Ref: loss detection algorithm in draft-dukkipati-tcpm-tcp-loss-probe.
+ */
+static void tcp_process_tlp_ack(struct sock *sk, u32 ack, int flag)
 {
-	/* unprotected vars, we dont care of overwrites */
-	static u32 challenge_timestamp;
-	static unsigned int challenge_count;
-	u32 now = jiffies / HZ;
+	struct tcp_sock *tp = tcp_sk(sk);
+	bool is_tlp_dupack = (ack == tp->tlp_high_seq) &&
+			     !(flag & (FLAG_SND_UNA_ADVANCED |
+				       FLAG_NOT_DUP | FLAG_DATA_SACKED));
 
-	if (now != challenge_timestamp) {
-		challenge_timestamp = now;
-		challenge_count = 0;
+	/* Mark the end of TLP episode on receiving TLP dupack or when
+	 * ack is after tlp_high_seq.
+	 */
+	if (is_tlp_dupack) {
+		tp->tlp_high_seq = 0;
+		return;
 	}
-	if (++challenge_count <= sysctl_tcp_challenge_ack_limit) {
-		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPCHALLENGEACK);
-		tcp_send_ack(sk);
+
+	if (after(ack, tp->tlp_high_seq)) {
+		tp->tlp_high_seq = 0;
+		/* Don't reduce cwnd if DSACK arrives for TLP retrans. */
+		if (!(flag & FLAG_DSACKING_ACK)) {
+			tcp_init_cwnd_reduction(sk, true);
+			tcp_set_ca_state(sk, TCP_CA_CWR);
+			tcp_end_cwnd_reduction(sk);
+			tcp_set_ca_state(sk, TCP_CA_Open);
+			NET_INC_STATS_BH(sock_net(sk),
+					 LINUX_MIB_TCPLOSSPROBERECOVERY);
+		}
 	}
 }
 
@@ -3586,10 +3332,10 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	bool is_dupack = false;
 	u32 prior_in_flight;
 	u32 prior_fackets;
-	int prior_packets;
+	int prior_packets = tp->packets_out;
 	int prior_sacked = tp->sacked_out;
 	int pkts_acked = 0;
-	bool frto_cwnd = false;
+	int previous_packets_out = 0;
 
 	/* If the ack is older than previous acks
 	 * then we can probably ignore it.
@@ -3609,24 +3355,22 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	if (after(ack, tp->snd_nxt))
 		goto invalid_ack;
 
-	if (tp->early_retrans_delayed)
+	if (icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE)
 		tcp_rearm_rto(sk);
 
 	if (after(ack, prior_snd_una))
 		flag |= FLAG_SND_UNA_ADVANCED;
 
-	if (sysctl_tcp_abc) {
-		if (icsk->icsk_ca_state < TCP_CA_CWR)
-			tp->bytes_acked += ack - prior_snd_una;
-		else if (icsk->icsk_ca_state == TCP_CA_Loss)
-			/* we assume just one segment left network */
-			tp->bytes_acked += min(ack - prior_snd_una,
-					       tp->mss_cache);
-	}
-
 	prior_fackets = tp->fackets_out;
 	prior_in_flight = tcp_packets_in_flight(tp);
 
+	/* ts_recent update must be made after we are sure that the packet
+	 * is in window.
+	 */
+	if (flag & FLAG_UPDATE_TS_RECENT)
+		tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
+
 	if (!(flag & FLAG_SLOWPATH) && after(ack, prior_snd_una)) {
 		/* Window is constant, pure forward advance.
 		 * No more checks are required.
@@ -3662,52 +3406,54 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	sk->sk_err_soft = 0;
 	icsk->icsk_probes_out = 0;
 	tp->rcv_tstamp = tcp_time_stamp;
-	prior_packets = tp->packets_out;
 	if (!prior_packets)
 		goto no_queue;
 
 	/* See if we can take anything off of the retransmit queue. */
+	previous_packets_out = tp->packets_out;
 	flag |= tcp_clean_rtx_queue(sk, prior_fackets, prior_snd_una);
 
-	pkts_acked = prior_packets - tp->packets_out;
-
-	if (tp->frto_counter)
-		frto_cwnd = tcp_process_frto(sk, flag);
-	/* Guarantee sacktag reordering detection against wrap-arounds */
-	if (before(tp->frto_highmark, tp->snd_una))
-		tp->frto_highmark = 0;
+	pkts_acked = previous_packets_out - tp->packets_out;
 
 	if (tcp_ack_is_dubious(sk, flag)) {
 		/* Advance CWND, if state allows this. */
-		if ((flag & FLAG_DATA_ACKED) && !frto_cwnd &&
-		    tcp_may_raise_cwnd(sk, flag))
+		if ((flag & FLAG_DATA_ACKED) && tcp_may_raise_cwnd(sk, flag))
 			tcp_cong_avoid(sk, ack, prior_in_flight);
 		is_dupack = !(flag & (FLAG_SND_UNA_ADVANCED | FLAG_NOT_DUP));
 		tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
-				      is_dupack, flag);
+				      prior_packets, is_dupack, flag);
 	} else {
-		if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
+		if (flag & FLAG_DATA_ACKED)
 			tcp_cong_avoid(sk, ack, prior_in_flight);
 	}
 
+	if (tp->tlp_high_seq)
+		tcp_process_tlp_ack(sk, ack, flag);
+
 	if ((flag & FLAG_FORWARD_PROGRESS) || !(flag & FLAG_NOT_DUP)) {
 		struct dst_entry *dst = __sk_dst_get(sk);
 		if (dst)
 			dst_confirm(dst);
 	}
+
+	if (icsk->icsk_pending == ICSK_TIME_RETRANS)
+		tcp_schedule_loss_probe(sk);
 	return 1;
 
 no_queue:
 	/* If data was DSACKed, see if we can undo a cwnd reduction. */
 	if (flag & FLAG_DSACKING_ACK)
 		tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
-				      is_dupack, flag);
+				      prior_packets, is_dupack, flag);
 	/* If this ack opens up a zero window, clear backoff.  It was
 	 * being used to time the probes, and is probably far higher than
 	 * it needs to be for normal retransmission.
 	 */
 	if (tcp_send_head(sk))
 		tcp_ack_probe(sk);
+
+	if (tp->tlp_high_seq)
+		tcp_process_tlp_ack(sk, ack, flag);
 	return 1;
 
 invalid_ack:
@@ -3721,7 +3467,7 @@ old_ack:
 	if (TCP_SKB_CB(skb)->sacked) {
 		flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una);
 		tcp_fastretrans_alert(sk, pkts_acked, prior_sacked,
-				      is_dupack, flag);
+				      prior_packets, is_dupack, flag);
 	}
 
 	SOCK_DEBUG(sk, "Ack %u before %u:%u\n", ack, tp->snd_una, tp->snd_nxt);
@@ -3732,8 +3478,8 @@ old_ack:
  * But, this can also be called on packets in the established flow when
  * the fast version below fails.
  */
-void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *opt_rx,
-		       const u8 **hvpp, int estab,
+void tcp_parse_options(const struct sk_buff *skb,
+		       struct tcp_options_received *opt_rx, int estab,
 		       struct tcp_fastopen_cookie *foc)
 {
 	const unsigned char *ptr;
@@ -3817,31 +3563,6 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
 				 */
 				break;
 #endif
-			case TCPOPT_COOKIE:
-				/* This option is variable length.
-				 */
-				switch (opsize) {
-				case TCPOLEN_COOKIE_BASE:
-					/* not yet implemented */
-					break;
-				case TCPOLEN_COOKIE_PAIR:
-					/* not yet implemented */
-					break;
-				case TCPOLEN_COOKIE_MIN+0:
-				case TCPOLEN_COOKIE_MIN+2:
-				case TCPOLEN_COOKIE_MIN+4:
-				case TCPOLEN_COOKIE_MIN+6:
-				case TCPOLEN_COOKIE_MAX:
-					/* 16-bit multiple */
-					opt_rx->cookie_plus = opsize;
-					*hvpp = ptr;
-					break;
-				default:
-					/* ignore option */
-					break;
-				}
-				break;
-
 			case TCPOPT_EXP:
 				/* Fast Open option shares code 254 using a
 				 * 16 bits magic number. It's valid only in
@@ -3877,7 +3598,7 @@ static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr
 		++ptr;
 		tp->rx_opt.rcv_tsval = ntohl(*ptr);
 		++ptr;
-		tp->rx_opt.rcv_tsecr = ntohl(*ptr);
+		tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
 		return true;
 	}
 	return false;
@@ -3887,8 +3608,7 @@ static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr
  * If it is wrong it falls back on tcp_parse_options().
  */
 static bool tcp_fast_parse_options(const struct sk_buff *skb,
-				   const struct tcphdr *th,
-				   struct tcp_sock *tp, const u8 **hvpp)
+				   const struct tcphdr *th, struct tcp_sock *tp)
 {
 	/* In the spirit of fast parsing, compare doff directly to constant
 	 * values.  Because equality is used, short doff can be ignored here.
@@ -3901,7 +3621,11 @@ static bool tcp_fast_parse_options(const struct sk_buff *skb,
 		if (tcp_parse_aligned_timestamp(tp, th))
 			return true;
 	}
-	tcp_parse_options(skb, &tp->rx_opt, hvpp, 1, NULL);
+
+	tcp_parse_options(skb, &tp->rx_opt, 1, NULL);
+	if (tp->rx_opt.saw_tstamp)
+		tp->rx_opt.rcv_tsecr -= tp->tsoffset;
+
 	return true;
 }
 
@@ -3943,27 +3667,6 @@ const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
 EXPORT_SYMBOL(tcp_parse_md5sig_option);
 #endif
 
-static inline void tcp_store_ts_recent(struct tcp_sock *tp)
-{
-	tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval;
-	tp->rx_opt.ts_recent_stamp = get_seconds();
-}
-
-static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
-{
-	if (tp->rx_opt.saw_tstamp && !after(seq, tp->rcv_wup)) {
-		/* PAWS bug workaround wrt. ACK frames, the PAWS discard
-		 * extra check below makes sure this can only happen
-		 * for pure ACK frames.  -DaveM
-		 *
-		 * Not only, also it occurs for expired timestamps.
-		 */
-
-		if (tcp_paws_check(&tp->rx_opt, 0))
-			tcp_store_ts_recent(tp);
-	}
-}
-
 /* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM
  *
  * It is not fatal. If this ACK does _not_ change critical state (seqs, window)
@@ -5279,12 +4982,10 @@ out:
 static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
 				  const struct tcphdr *th, int syn_inerr)
 {
-	const u8 *hash_location;
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	/* RFC1323: H1. Apply PAWS check first. */
-	if (tcp_fast_parse_options(skb, th, tp, &hash_location) &&
-	    tp->rx_opt.saw_tstamp &&
+	if (tcp_fast_parse_options(skb, th, tp) && tp->rx_opt.saw_tstamp &&
 	    tcp_paws_discard(sk, skb)) {
 		if (!th->rst) {
 			NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSESTABREJECTED);
@@ -5498,6 +5199,9 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 				if (tcp_checksum_complete_user(sk, skb))
 					goto csum_error;
 
+				if ((int)skb->truesize > sk->sk_forward_alloc)
+					goto step5;
+
 				/* Predicted packet is in window by definition.
 				 * seq == rcv_nxt and rcv_wup <= rcv_nxt.
 				 * Hence, check seq<=rcv_wup reduces to:
@@ -5509,9 +5213,6 @@ int tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 
 				tcp_rcv_rtt_measure_ts(sk, skb);
 
-				if ((int)skb->truesize > sk->sk_forward_alloc)
-					goto step5;
-
 				NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPHPHITS);
 
 				/* Bulk data transfer: receiver */
@@ -5559,14 +5260,9 @@ slow_path:
 		return 0;
 
 step5:
-	if (tcp_ack(sk, skb, FLAG_SLOWPATH) < 0)
+	if (tcp_ack(sk, skb, FLAG_SLOWPATH | FLAG_UPDATE_TS_RECENT) < 0)
 		goto discard;
 
-	/* ts_recent update must be made after we are sure that the packet
-	 * is in window.
-	 */
-	tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
-
 	tcp_rcv_rtt_measure_ts(sk, skb);
 
 	/* Process urgent data. */
@@ -5580,6 +5276,7 @@ step5:
 	return 0;
 
 csum_error:
+	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
 	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
 
 discard:
@@ -5638,12 +5335,11 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
 
 	if (mss == tp->rx_opt.user_mss) {
 		struct tcp_options_received opt;
-		const u8 *hash_location;
 
 		/* Get original SYNACK MSS value if user MSS sets mss_clamp */
 		tcp_clear_options(&opt);
 		opt.user_mss = opt.mss_clamp = 0;
-		tcp_parse_options(synack, &opt, &hash_location, 0, NULL);
+		tcp_parse_options(synack, &opt, 0, NULL);
 		mss = opt.mss_clamp;
 	}
 
@@ -5674,14 +5370,14 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
 static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 					 const struct tcphdr *th, unsigned int len)
 {
-	const u8 *hash_location;
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct tcp_cookie_values *cvp = tp->cookie_values;
 	struct tcp_fastopen_cookie foc = { .len = -1 };
 	int saved_clamp = tp->rx_opt.mss_clamp;
 
-	tcp_parse_options(skb, &tp->rx_opt, &hash_location, 0, &foc);
+	tcp_parse_options(skb, &tp->rx_opt, 0, &foc);
+	if (tp->rx_opt.saw_tstamp)
+		tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
 	if (th->ack) {
 		/* rfc793:
@@ -5776,30 +5472,6 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 		 * is initialized. */
 		tp->copied_seq = tp->rcv_nxt;
 
-		if (cvp != NULL &&
-		    cvp->cookie_pair_size > 0 &&
-		    tp->rx_opt.cookie_plus > 0) {
-			int cookie_size = tp->rx_opt.cookie_plus
-					- TCPOLEN_COOKIE_BASE;
-			int cookie_pair_size = cookie_size
-					     + cvp->cookie_desired;
-
-			/* A cookie extension option was sent and returned.
-			 * Note that each incoming SYNACK replaces the
-			 * Responder cookie.  The initial exchange is most
-			 * fragile, as protection against spoofing relies
-			 * entirely upon the sequence and timestamp (above).
-			 * This replacement strategy allows the correct pair to
-			 * pass through, while any others will be filtered via
-			 * Responder verification later.
-			 */
-			if (sizeof(cvp->cookie_pair) >= cookie_pair_size) {
-				memcpy(&cvp->cookie_pair[cvp->cookie_desired],
-				       hash_location, cookie_size);
-				cvp->cookie_pair_size = cookie_pair_size;
-			}
-		}
-
 		smp_mb();
 
 		tcp_finish_connect(sk, skb);
@@ -6000,7 +5672,8 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 
 	/* step 5: check the ACK field */
 	if (true) {
-		int acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH) > 0;
+		int acceptable = tcp_ack(sk, skb, FLAG_SLOWPATH |
+						  FLAG_UPDATE_TS_RECENT) > 0;
 
 		switch (sk->sk_state) {
 		case TCP_SYN_RECV:
@@ -6151,11 +5824,6 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
 		}
 	}
 
-	/* ts_recent update must be made after we are sure that the packet
-	 * is in window.
-	 */
-	tcp_replace_ts_recent(tp, TCP_SKB_CB(skb)->seq);
-
 	/* step 6: check the URG bit */
 	tcp_urg(sk, skb, th);
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index eadb693..7999fc5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -274,13 +274,6 @@ static void tcp_v4_mtu_reduced(struct sock *sk)
 	struct inet_sock *inet = inet_sk(sk);
 	u32 mtu = tcp_sk(sk)->mtu_info;
 
-	/* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs
-	 * send out by Linux are always <576bytes so they should go through
-	 * unfragmented).
-	 */
-	if (sk->sk_state == TCP_LISTEN)
-		return;
-
 	dst = inet_csk_update_pmtu(sk, mtu);
 	if (!dst)
 		return;
@@ -408,6 +401,13 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
 			goto out;
 
 		if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */
+			/* We are not interested in TCP_LISTEN and open_requests
+			 * (SYN-ACKs send out by Linux are always <576bytes so
+			 * they should go through unfragmented).
+			 */
+			if (sk->sk_state == TCP_LISTEN)
+				goto out;
+
 			tp->mtu_info = info;
 			if (!sock_owned_by_user(sk)) {
 				tcp_v4_mtu_reduced(sk);
@@ -657,7 +657,8 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 		 * no RST generated if md5 hash doesn't match.
 		 */
 		sk1 = __inet_lookup_listener(dev_net(skb_dst(skb)->dev),
-					     &tcp_hashinfo, ip_hdr(skb)->daddr,
+					     &tcp_hashinfo, ip_hdr(skb)->saddr,
+					     th->source, ip_hdr(skb)->daddr,
 					     ntohs(th->source), inet_iif(skb));
 		/* don't send rst if it can't find key */
 		if (!sk1)
@@ -725,7 +726,7 @@ release_sk1:
  */
 
 static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
-			    u32 win, u32 ts, int oif,
+			    u32 win, u32 tsval, u32 tsecr, int oif,
 			    struct tcp_md5sig_key *key,
 			    int reply_flags, u8 tos)
 {
@@ -746,12 +747,12 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
 
 	arg.iov[0].iov_base = (unsigned char *)&rep;
 	arg.iov[0].iov_len  = sizeof(rep.th);
-	if (ts) {
+	if (tsecr) {
 		rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
 				   (TCPOPT_TIMESTAMP << 8) |
 				   TCPOLEN_TIMESTAMP);
-		rep.opt[1] = htonl(tcp_time_stamp);
-		rep.opt[2] = htonl(ts);
+		rep.opt[1] = htonl(tsval);
+		rep.opt[2] = htonl(tsecr);
 		arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED;
 	}
 
@@ -766,7 +767,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
 
 #ifdef CONFIG_TCP_MD5SIG
 	if (key) {
-		int offset = (ts) ? 3 : 0;
+		int offset = (tsecr) ? 3 : 0;
 
 		rep.opt[offset++] = htonl((TCPOPT_NOP << 24) |
 					  (TCPOPT_NOP << 16) |
@@ -801,6 +802,7 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
 
 	tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
 			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
+			tcp_time_stamp + tcptw->tw_ts_offset,
 			tcptw->tw_ts_recent,
 			tw->tw_bound_dev_if,
 			tcp_twsk_md5_key(tcptw),
@@ -820,6 +822,7 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
 	tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ?
 			tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
 			tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
+			tcp_time_stamp,
 			req->ts_recent,
 			0,
 			tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr,
@@ -835,7 +838,6 @@ static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
  */
 static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
 			      struct request_sock *req,
-			      struct request_values *rvp,
 			      u16 queue_mapping,
 			      bool nocache)
 {
@@ -848,7 +850,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
 	if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL)
 		return -1;
 
-	skb = tcp_make_synack(sk, dst, req, rvp, NULL);
+	skb = tcp_make_synack(sk, dst, req, NULL);
 
 	if (skb) {
 		__tcp_v4_send_check(skb, ireq->loc_addr, ireq->rmt_addr);
@@ -865,10 +867,9 @@ static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst,
 	return err;
 }
 
-static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req,
-			     struct request_values *rvp)
+static int tcp_v4_rtx_synack(struct sock *sk, struct request_sock *req)
 {
-	int res = tcp_v4_send_synack(sk, NULL, req, rvp, 0, false);
+	int res = tcp_v4_send_synack(sk, NULL, req, 0, false);
 
 	if (!res)
 		TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
@@ -951,7 +952,6 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk,
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_md5sig_key *key;
-	struct hlist_node *pos;
 	unsigned int size = sizeof(struct in_addr);
 	struct tcp_md5sig_info *md5sig;
 
@@ -965,7 +965,7 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk,
 	if (family == AF_INET6)
 		size = sizeof(struct in6_addr);
 #endif
-	hlist_for_each_entry_rcu(key, pos, &md5sig->head, node) {
+	hlist_for_each_entry_rcu(key, &md5sig->head, node) {
 		if (key->family != family)
 			continue;
 		if (!memcmp(&key->addr, addr, size))
@@ -1003,7 +1003,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_md5sig_info *md5sig;
 
-	key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET);
+	key = tcp_md5_do_lookup(sk, addr, family);
 	if (key) {
 		/* Pre-existing entry - just update that one. */
 		memcpy(key->key, newkey, newkeylen);
@@ -1048,7 +1048,7 @@ int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family)
 	struct tcp_md5sig_key *key;
 	struct tcp_md5sig_info *md5sig;
 
-	key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET);
+	key = tcp_md5_do_lookup(sk, addr, family);
 	if (!key)
 		return -ENOENT;
 	hlist_del_rcu(&key->node);
@@ -1066,14 +1066,14 @@ static void tcp_clear_md5_list(struct sock *sk)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp_md5sig_key *key;
-	struct hlist_node *pos, *n;
+	struct hlist_node *n;
 	struct tcp_md5sig_info *md5sig;
 
 	md5sig = rcu_dereference_protected(tp->md5sig_info, 1);
 
 	if (!hlist_empty(&md5sig->head))
 		tcp_free_md5sig_pool();
-	hlist_for_each_entry_safe(key, pos, n, &md5sig->head, node) {
+	hlist_for_each_entry_safe(key, n, &md5sig->head, node) {
 		hlist_del_rcu(&key->node);
 		atomic_sub(sizeof(*key), &sk->sk_omem_alloc);
 		kfree_rcu(key, rcu);
@@ -1369,8 +1369,7 @@ static bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb,
 static int tcp_v4_conn_req_fastopen(struct sock *sk,
 				    struct sk_buff *skb,
 				    struct sk_buff *skb_synack,
-				    struct request_sock *req,
-				    struct request_values *rvp)
+				    struct request_sock *req)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;
@@ -1465,9 +1464,7 @@ static int tcp_v4_conn_req_fastopen(struct sock *sk,
 
 int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcp_extend_values tmp_ext;
 	struct tcp_options_received tmp_opt;
-	const u8 *hash_location;
 	struct request_sock *req;
 	struct inet_request_sock *ireq;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -1517,42 +1514,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	tcp_clear_options(&tmp_opt);
 	tmp_opt.mss_clamp = TCP_MSS_DEFAULT;
 	tmp_opt.user_mss  = tp->rx_opt.user_mss;
-	tcp_parse_options(skb, &tmp_opt, &hash_location, 0,
-	    want_cookie ? NULL : &foc);
-
-	if (tmp_opt.cookie_plus > 0 &&
-	    tmp_opt.saw_tstamp &&
-	    !tp->rx_opt.cookie_out_never &&
-	    (sysctl_tcp_cookie_size > 0 ||
-	     (tp->cookie_values != NULL &&
-	      tp->cookie_values->cookie_desired > 0))) {
-		u8 *c;
-		u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
-		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;
-
-		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
-			goto drop_and_release;
-
-		/* Secret recipe starts with IP addresses */
-		*mess++ ^= (__force u32)daddr;
-		*mess++ ^= (__force u32)saddr;
-
-		/* plus variable length Initiator Cookie */
-		c = (u8 *)mess;
-		while (l-- > 0)
-			*c++ ^= *hash_location++;
-
-		want_cookie = false;	/* not our kind of cookie */
-		tmp_ext.cookie_out_never = 0; /* false */
-		tmp_ext.cookie_plus = tmp_opt.cookie_plus;
-	} else if (!tp->rx_opt.cookie_in_always) {
-		/* redundant indications, but ensure initialization. */
-		tmp_ext.cookie_out_never = 1; /* true */
-		tmp_ext.cookie_plus = 0;
-	} else {
-		goto drop_and_release;
-	}
-	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
+	tcp_parse_options(skb, &tmp_opt, 0, want_cookie ? NULL : &foc);
 
 	if (want_cookie && !tmp_opt.saw_tstamp)
 		tcp_clear_options(&tmp_opt);
@@ -1570,7 +1532,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 		goto drop_and_free;
 
 	if (!want_cookie || tmp_opt.tstamp_ok)
-		TCP_ECN_create_request(req, skb);
+		TCP_ECN_create_request(req, skb, sock_net(sk));
 
 	if (want_cookie) {
 		isn = cookie_v4_init_sequence(sk, skb, &req->mss);
@@ -1634,7 +1596,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 	 * of tcp_v4_send_synack()->tcp_select_initial_window().
 	 */
 	skb_synack = tcp_make_synack(sk, dst, req,
-	    (struct request_values *)&tmp_ext,
 	    fastopen_cookie_present(&valid_foc) ? &valid_foc : NULL);
 
 	if (skb_synack) {
@@ -1658,8 +1619,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 		if (fastopen_cookie_present(&foc) && foc.len != 0)
 			NET_INC_STATS_BH(sock_net(sk),
 			    LINUX_MIB_TCPFASTOPENPASSIVEFAIL);
-	} else if (tcp_v4_conn_req_fastopen(sk, skb, skb_synack, req,
-	    (struct request_values *)&tmp_ext))
+	} else if (tcp_v4_conn_req_fastopen(sk, skb, skb_synack, req))
 		goto drop_and_free;
 
 	return 0;
@@ -1906,6 +1866,7 @@ discard:
 	return 0;
 
 csum_err:
+	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
 	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
 	goto discard;
 }
@@ -1948,6 +1909,51 @@ void tcp_v4_early_demux(struct sk_buff *skb)
 	}
 }
 
+/* Packet is added to VJ-style prequeue for processing in process
+ * context, if a reader task is waiting. Apparently, this exciting
+ * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93)
+ * failed somewhere. Latency? Burstiness? Well, at least now we will
+ * see, why it failed. 8)8)				  --ANK
+ *
+ */
+bool tcp_prequeue(struct sock *sk, struct sk_buff *skb)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+
+	if (sysctl_tcp_low_latency || !tp->ucopy.task)
+		return false;
+
+	if (skb->len <= tcp_hdrlen(skb) &&
+	    skb_queue_len(&tp->ucopy.prequeue) == 0)
+		return false;
+
+	skb_dst_force(skb);
+	__skb_queue_tail(&tp->ucopy.prequeue, skb);
+	tp->ucopy.memory += skb->truesize;
+	if (tp->ucopy.memory > sk->sk_rcvbuf) {
+		struct sk_buff *skb1;
+
+		BUG_ON(sock_owned_by_user(sk));
+
+		while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) {
+			sk_backlog_rcv(sk, skb1);
+			NET_INC_STATS_BH(sock_net(sk),
+					 LINUX_MIB_TCPPREQUEUEDROPPED);
+		}
+
+		tp->ucopy.memory = 0;
+	} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
+		wake_up_interruptible_sync_poll(sk_sleep(sk),
+					   POLLIN | POLLRDNORM | POLLRDBAND);
+		if (!inet_csk_ack_scheduled(sk))
+			inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
+						  (3 * tcp_rto_min(sk)) / 4,
+						  TCP_RTO_MAX);
+	}
+	return true;
+}
+EXPORT_SYMBOL(tcp_prequeue);
+
 /*
  *	From tcp_input.c
  */
@@ -1981,7 +1987,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	 * provided case of th->doff==0 is eliminated.
 	 * So, we defer the checks. */
 	if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb))
-		goto bad_packet;
+		goto csum_error;
 
 	th = tcp_hdr(skb);
 	iph = ip_hdr(skb);
@@ -2047,6 +2053,8 @@ no_tcp_socket:
 		goto discard_it;
 
 	if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) {
+csum_error:
+		TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
 bad_packet:
 		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
 	} else {
@@ -2068,15 +2076,19 @@ do_time_wait:
 		goto discard_it;
 	}
 
-	if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) {
-		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
+	if (skb->len < (th->doff << 2)) {
 		inet_twsk_put(inet_twsk(sk));
-		goto discard_it;
+		goto bad_packet;
+	}
+	if (tcp_checksum_complete(skb)) {
+		inet_twsk_put(inet_twsk(sk));
+		goto csum_error;
 	}
 	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
 	case TCP_TW_SYN: {
 		struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev),
 							&tcp_hashinfo,
+							iph->saddr, th->source,
 							iph->daddr, th->dest,
 							inet_iif(skb));
 		if (sk2) {
@@ -2194,12 +2206,6 @@ void tcp_v4_destroy_sock(struct sock *sk)
 	if (inet_csk(sk)->icsk_bind_hash)
 		inet_put_port(sk);
 
-	/* TCP Cookie Transactions */
-	if (tp->cookie_values != NULL) {
-		kref_put(&tp->cookie_values->kref,
-			 tcp_cookie_values_release);
-		tp->cookie_values = NULL;
-	}
 	BUG_ON(tp->fastopen_rsk != NULL);
 
 	/* If socket is aborted during connect operation */
@@ -2577,7 +2583,7 @@ static void tcp_seq_stop(struct seq_file *seq, void *v)
 
 int tcp_seq_open(struct inode *inode, struct file *file)
 {
-	struct tcp_seq_afinfo *afinfo = PDE(inode)->data;
+	struct tcp_seq_afinfo *afinfo = PDE_DATA(inode);
 	struct tcp_iter_state *s;
 	int err;
 
@@ -2612,7 +2618,7 @@ EXPORT_SYMBOL(tcp_proc_register);
 
 void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo)
 {
-	proc_net_remove(net, afinfo->name);
+	remove_proc_entry(afinfo->name, net->proc_net);
 }
 EXPORT_SYMBOL(tcp_proc_unregister);
 
@@ -2656,7 +2662,9 @@ static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i, int *len)
 	__u16 srcp = ntohs(inet->inet_sport);
 	int rx_queue;
 
-	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
+	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 		timer_active	= 1;
 		timer_expires	= icsk->icsk_timeout;
 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
@@ -2891,6 +2899,7 @@ EXPORT_SYMBOL(tcp_prot);
 
 static int __net_init tcp_sk_init(struct net *net)
 {
+	net->ipv4.sysctl_tcp_ecn = 2;
 	return 0;
 }
 
diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c
index b6f3583..da14436 100644
--- a/net/ipv4/tcp_memcontrol.c
+++ b/net/ipv4/tcp_memcontrol.c
@@ -64,7 +64,6 @@ void tcp_destroy_cgroup(struct mem_cgroup *memcg)
 {
 	struct cg_proto *cg_proto;
 	struct tcp_memcontrol *tcp;
-	u64 val;
 
 	cg_proto = tcp_prot.proto_cgroup(memcg);
 	if (!cg_proto)
@@ -72,8 +71,6 @@ void tcp_destroy_cgroup(struct mem_cgroup *memcg)
 
 	tcp = tcp_from_cgproto(cg_proto);
 	percpu_counter_destroy(&tcp->tcp_sockets_allocated);
-
-	val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_LIMIT);
 }
 EXPORT_SYMBOL(tcp_destroy_cgroup);
 
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index f696d7c..f6a005c 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -96,7 +96,8 @@ struct tcpm_hash_bucket {
 
 static DEFINE_SPINLOCK(tcp_metrics_lock);
 
-static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst)
+static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst,
+			  bool fastopen_clear)
 {
 	u32 val;
 
@@ -122,9 +123,11 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst)
 	tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING);
 	tm->tcpm_ts = 0;
 	tm->tcpm_ts_stamp = 0;
-	tm->tcpm_fastopen.mss = 0;
-	tm->tcpm_fastopen.syn_loss = 0;
-	tm->tcpm_fastopen.cookie.len = 0;
+	if (fastopen_clear) {
+		tm->tcpm_fastopen.mss = 0;
+		tm->tcpm_fastopen.syn_loss = 0;
+		tm->tcpm_fastopen.cookie.len = 0;
+	}
 }
 
 static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst,
@@ -154,7 +157,7 @@ static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst,
 	}
 	tm->tcpm_addr = *addr;
 
-	tcpm_suck_dst(tm, dst);
+	tcpm_suck_dst(tm, dst, true);
 
 	if (likely(!reclaim)) {
 		tm->tcpm_next = net->ipv4.tcp_metrics_hash[hash].chain;
@@ -171,7 +174,7 @@ out_unlock:
 static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst)
 {
 	if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT)))
-		tcpm_suck_dst(tm, dst);
+		tcpm_suck_dst(tm, dst, false);
 }
 
 #define TCP_METRICS_RECLAIM_DEPTH	5
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index f35f2df..0f01788 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -93,15 +93,15 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
 			   const struct tcphdr *th)
 {
 	struct tcp_options_received tmp_opt;
-	const u8 *hash_location;
 	struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
 	bool paws_reject = false;
 
 	tmp_opt.saw_tstamp = 0;
 	if (th->doff > (sizeof(*th) >> 2) && tcptw->tw_ts_recent_stamp) {
-		tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL);
+		tcp_parse_options(skb, &tmp_opt, 0, NULL);
 
 		if (tmp_opt.saw_tstamp) {
+			tmp_opt.rcv_tsecr	-= tcptw->tw_ts_offset;
 			tmp_opt.ts_recent	= tcptw->tw_ts_recent;
 			tmp_opt.ts_recent_stamp	= tcptw->tw_ts_recent_stamp;
 			paws_reject = tcp_paws_reject(&tmp_opt, th->rst);
@@ -288,6 +288,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 		tcptw->tw_rcv_wnd	= tcp_receive_window(tp);
 		tcptw->tw_ts_recent	= tp->rx_opt.ts_recent;
 		tcptw->tw_ts_recent_stamp = tp->rx_opt.ts_recent_stamp;
+		tcptw->tw_ts_offset	= tp->tsoffset;
 
 #if IS_ENABLED(CONFIG_IPV6)
 		if (tw->tw_family == PF_INET6) {
@@ -386,32 +387,6 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		struct tcp_request_sock *treq = tcp_rsk(req);
 		struct inet_connection_sock *newicsk = inet_csk(newsk);
 		struct tcp_sock *newtp = tcp_sk(newsk);
-		struct tcp_sock *oldtp = tcp_sk(sk);
-		struct tcp_cookie_values *oldcvp = oldtp->cookie_values;
-
-		/* TCP Cookie Transactions require space for the cookie pair,
-		 * as it differs for each connection.  There is no need to
-		 * copy any s_data_payload stored at the original socket.
-		 * Failure will prevent resuming the connection.
-		 *
-		 * Presumed copied, in order of appearance:
-		 *	cookie_in_always, cookie_out_never
-		 */
-		if (oldcvp != NULL) {
-			struct tcp_cookie_values *newcvp =
-				kzalloc(sizeof(*newtp->cookie_values),
-					GFP_ATOMIC);
-
-			if (newcvp != NULL) {
-				kref_init(&newcvp->kref);
-				newcvp->cookie_desired =
-						oldcvp->cookie_desired;
-				newtp->cookie_values = newcvp;
-			} else {
-				/* Not Yet Implemented */
-				newtp->cookie_values = NULL;
-			}
-		}
 
 		/* Now setup tcp_sock */
 		newtp->pred_flags = 0;
@@ -420,8 +395,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		newtp->rcv_nxt = treq->rcv_isn + 1;
 
 		newtp->snd_sml = newtp->snd_una =
-		newtp->snd_nxt = newtp->snd_up =
-			treq->snt_isn + 1 + tcp_s_data_size(oldtp);
+		newtp->snd_nxt = newtp->snd_up = treq->snt_isn + 1;
 
 		tcp_prequeue_init(newtp);
 		INIT_LIST_HEAD(&newtp->tsq_node);
@@ -438,6 +412,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		newtp->fackets_out = 0;
 		newtp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 		tcp_enable_early_retrans(newtp);
+		newtp->tlp_high_seq = 0;
 
 		/* So many TCP implementations out there (incorrectly) count the
 		 * initial SYN frame in their delayed-ACK and congestion control
@@ -446,10 +421,6 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		 */
 		newtp->snd_cwnd = TCP_INIT_CWND;
 		newtp->snd_cwnd_cnt = 0;
-		newtp->bytes_acked = 0;
-
-		newtp->frto_counter = 0;
-		newtp->frto_highmark = 0;
 
 		if (newicsk->icsk_ca_ops != &tcp_init_congestion_ops &&
 		    !try_module_get(newicsk->icsk_ca_ops->owner))
@@ -458,8 +429,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		tcp_set_ca_state(newsk, TCP_CA_Open);
 		tcp_init_xmit_timers(newsk);
 		skb_queue_head_init(&newtp->out_of_order_queue);
-		newtp->write_seq = newtp->pushed_seq =
-			treq->snt_isn + 1 + tcp_s_data_size(oldtp);
+		newtp->write_seq = newtp->pushed_seq = treq->snt_isn + 1;
 
 		newtp->rx_opt.saw_tstamp = 0;
 
@@ -500,6 +470,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 			newtp->rx_opt.ts_recent_stamp = 0;
 			newtp->tcp_header_len = sizeof(struct tcphdr);
 		}
+		newtp->tsoffset = 0;
 #ifdef CONFIG_TCP_MD5SIG
 		newtp->md5sig_info = NULL;	/*XXX*/
 		if (newtp->af_specific->md5_lookup(sk, newsk))
@@ -535,7 +506,6 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 			   bool fastopen)
 {
 	struct tcp_options_received tmp_opt;
-	const u8 *hash_location;
 	struct sock *child;
 	const struct tcphdr *th = tcp_hdr(skb);
 	__be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
@@ -545,7 +515,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 
 	tmp_opt.saw_tstamp = 0;
 	if (th->doff > (sizeof(struct tcphdr)>>2)) {
-		tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL);
+		tcp_parse_options(skb, &tmp_opt, 0, NULL);
 
 		if (tmp_opt.saw_tstamp) {
 			tmp_opt.ts_recent = req->ts_recent;
@@ -581,8 +551,13 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 		 *
 		 * Note that even if there is new data in the SYN packet
 		 * they will be thrown away too.
+		 *
+		 * Reset timer after retransmitting SYNACK, similar to
+		 * the idea of fast retransmit in recovery.
 		 */
-		inet_rtx_syn_ack(sk, req);
+		if (!inet_rtx_syn_ack(sk, req))
+			req->expires = min(TCP_TIMEOUT_INIT << req->num_timeout,
+					   TCP_RTO_MAX) + jiffies;
 		return NULL;
 	}
 
@@ -645,7 +620,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
 	 */
 	if ((flg & TCP_FLAG_ACK) && !fastopen &&
 	    (TCP_SKB_CB(skb)->ack_seq !=
-	     tcp_rsk(req)->snt_isn + 1 + tcp_s_data_size(tcp_sk(sk))))
+	     tcp_rsk(req)->snt_isn + 1))
 		return sk;
 
 	/* Also, it would be not so bad idea to check rcv_tsecr, which
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 5d45159..ec335fa 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -65,28 +65,24 @@ int sysctl_tcp_base_mss __read_mostly = TCP_BASE_MSS;
 /* By default, RFC2861 behavior.  */
 int sysctl_tcp_slow_start_after_idle __read_mostly = 1;
 
-int sysctl_tcp_cookie_size __read_mostly = 0; /* TCP_COOKIE_MAX */
-EXPORT_SYMBOL_GPL(sysctl_tcp_cookie_size);
-
 static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
 			   int push_one, gfp_t gfp);
 
 /* Account for new data that has been sent to the network. */
 static void tcp_event_new_data_sent(struct sock *sk, const struct sk_buff *skb)
 {
+	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	unsigned int prior_packets = tp->packets_out;
 
 	tcp_advance_send_head(sk, skb);
 	tp->snd_nxt = TCP_SKB_CB(skb)->end_seq;
 
-	/* Don't override Nagle indefinitely with F-RTO */
-	if (tp->frto_counter == 2)
-		tp->frto_counter = 3;
-
 	tp->packets_out += tcp_skb_pcount(skb);
-	if (!prior_packets || tp->early_retrans_delayed)
+	if (!prior_packets || icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
+	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
 		tcp_rearm_rto(sk);
+	}
 }
 
 /* SND.NXT, if window was not shrunk.
@@ -314,7 +310,7 @@ static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
 	struct tcp_sock *tp = tcp_sk(sk);
 
 	tp->ecn_flags = 0;
-	if (sysctl_tcp_ecn == 1) {
+	if (sock_net(sk)->ipv4.sysctl_tcp_ecn == 1) {
 		TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR;
 		tp->ecn_flags = TCP_ECN_OK;
 	}
@@ -384,7 +380,6 @@ static inline bool tcp_urg_mode(const struct tcp_sock *tp)
 #define OPTION_TS		(1 << 1)
 #define OPTION_MD5		(1 << 2)
 #define OPTION_WSCALE		(1 << 3)
-#define OPTION_COOKIE_EXTENSION	(1 << 4)
 #define OPTION_FAST_OPEN_COOKIE	(1 << 8)
 
 struct tcp_out_options {
@@ -398,36 +393,6 @@ struct tcp_out_options {
 	struct tcp_fastopen_cookie *fastopen_cookie;	/* Fast open cookie */
 };
 
-/* The sysctl int routines are generic, so check consistency here.
- */
-static u8 tcp_cookie_size_check(u8 desired)
-{
-	int cookie_size;
-
-	if (desired > 0)
-		/* previously specified */
-		return desired;
-
-	cookie_size = ACCESS_ONCE(sysctl_tcp_cookie_size);
-	if (cookie_size <= 0)
-		/* no default specified */
-		return 0;
-
-	if (cookie_size <= TCP_COOKIE_MIN)
-		/* value too small, specify minimum */
-		return TCP_COOKIE_MIN;
-
-	if (cookie_size >= TCP_COOKIE_MAX)
-		/* value too large, specify maximum */
-		return TCP_COOKIE_MAX;
-
-	if (cookie_size & 1)
-		/* 8-bit multiple, illegal, fix it */
-		cookie_size++;
-
-	return (u8)cookie_size;
-}
-
 /* Write previously computed TCP options to the packet.
  *
  * Beware: Something in the Internet is very sensitive to the ordering of
@@ -446,27 +411,9 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
 {
 	u16 options = opts->options;	/* mungable copy */
 
-	/* Having both authentication and cookies for security is redundant,
-	 * and there's certainly not enough room.  Instead, the cookie-less
-	 * extension variant is proposed.
-	 *
-	 * Consider the pessimal case with authentication.  The options
-	 * could look like:
-	 *   COOKIE|MD5(20) + MSS(4) + SACK|TS(12) + WSCALE(4) == 40
-	 */
 	if (unlikely(OPTION_MD5 & options)) {
-		if (unlikely(OPTION_COOKIE_EXTENSION & options)) {
-			*ptr++ = htonl((TCPOPT_COOKIE << 24) |
-				       (TCPOLEN_COOKIE_BASE << 16) |
-				       (TCPOPT_MD5SIG << 8) |
-				       TCPOLEN_MD5SIG);
-		} else {
-			*ptr++ = htonl((TCPOPT_NOP << 24) |
-				       (TCPOPT_NOP << 16) |
-				       (TCPOPT_MD5SIG << 8) |
-				       TCPOLEN_MD5SIG);
-		}
-		options &= ~OPTION_COOKIE_EXTENSION;
+		*ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+			       (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
 		/* overload cookie hash location */
 		opts->hash_location = (__u8 *)ptr;
 		ptr += 4;
@@ -495,44 +442,6 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
 		*ptr++ = htonl(opts->tsecr);
 	}
 
-	/* Specification requires after timestamp, so do it now.
-	 *
-	 * Consider the pessimal case without authentication.  The options
-	 * could look like:
-	 *   MSS(4) + SACK|TS(12) + COOKIE(20) + WSCALE(4) == 40
-	 */
-	if (unlikely(OPTION_COOKIE_EXTENSION & options)) {
-		__u8 *cookie_copy = opts->hash_location;
-		u8 cookie_size = opts->hash_size;
-
-		/* 8-bit multiple handled in tcp_cookie_size_check() above,
-		 * and elsewhere.
-		 */
-		if (0x2 & cookie_size) {
-			__u8 *p = (__u8 *)ptr;
-
-			/* 16-bit multiple */
-			*p++ = TCPOPT_COOKIE;
-			*p++ = TCPOLEN_COOKIE_BASE + cookie_size;
-			*p++ = *cookie_copy++;
-			*p++ = *cookie_copy++;
-			ptr++;
-			cookie_size -= 2;
-		} else {
-			/* 32-bit multiple */
-			*ptr++ = htonl(((TCPOPT_NOP << 24) |
-					(TCPOPT_NOP << 16) |
-					(TCPOPT_COOKIE << 8) |
-					TCPOLEN_COOKIE_BASE) +
-				       cookie_size);
-		}
-
-		if (cookie_size > 0) {
-			memcpy(ptr, cookie_copy, cookie_size);
-			ptr += (cookie_size / 4);
-		}
-	}
-
 	if (unlikely(OPTION_SACK_ADVERTISE & options)) {
 		*ptr++ = htonl((TCPOPT_NOP << 24) |
 			       (TCPOPT_NOP << 16) |
@@ -591,11 +500,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
 				struct tcp_md5sig_key **md5)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct tcp_cookie_values *cvp = tp->cookie_values;
 	unsigned int remaining = MAX_TCP_OPTION_SPACE;
-	u8 cookie_size = (!tp->rx_opt.cookie_out_never && cvp != NULL) ?
-			 tcp_cookie_size_check(cvp->cookie_desired) :
-			 0;
 	struct tcp_fastopen_request *fastopen = tp->fastopen_req;
 
 #ifdef CONFIG_TCP_MD5SIG
@@ -622,7 +527,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
 
 	if (likely(sysctl_tcp_timestamps && *md5 == NULL)) {
 		opts->options |= OPTION_TS;
-		opts->tsval = TCP_SKB_CB(skb)->when;
+		opts->tsval = TCP_SKB_CB(skb)->when + tp->tsoffset;
 		opts->tsecr = tp->rx_opt.ts_recent;
 		remaining -= TCPOLEN_TSTAMP_ALIGNED;
 	}
@@ -647,52 +552,7 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb,
 			tp->syn_fastopen = 1;
 		}
 	}
-	/* Note that timestamps are required by the specification.
-	 *
-	 * Odd numbers of bytes are prohibited by the specification, ensuring
-	 * that the cookie is 16-bit aligned, and the resulting cookie pair is
-	 * 32-bit aligned.
-	 */
-	if (*md5 == NULL &&
-	    (OPTION_TS & opts->options) &&
-	    cookie_size > 0) {
-		int need = TCPOLEN_COOKIE_BASE + cookie_size;
-
-		if (0x2 & need) {
-			/* 32-bit multiple */
-			need += 2; /* NOPs */
-
-			if (need > remaining) {
-				/* try shrinking cookie to fit */
-				cookie_size -= 2;
-				need -= 4;
-			}
-		}
-		while (need > remaining && TCP_COOKIE_MIN <= cookie_size) {
-			cookie_size -= 4;
-			need -= 4;
-		}
-		if (TCP_COOKIE_MIN <= cookie_size) {
-			opts->options |= OPTION_COOKIE_EXTENSION;
-			opts->hash_location = (__u8 *)&cvp->cookie_pair[0];
-			opts->hash_size = cookie_size;
-
-			/* Remember for future incarnations. */
-			cvp->cookie_desired = cookie_size;
-
-			if (cvp->cookie_desired != cvp->cookie_pair_size) {
-				/* Currently use random bytes as a nonce,
-				 * assuming these are completely unpredictable
-				 * by hostile users of the same system.
-				 */
-				get_random_bytes(&cvp->cookie_pair[0],
-						 cookie_size);
-				cvp->cookie_pair_size = cookie_size;
-			}
 
-			remaining -= need;
-		}
-	}
 	return MAX_TCP_OPTION_SPACE - remaining;
 }
 
@@ -702,14 +562,10 @@ static unsigned int tcp_synack_options(struct sock *sk,
 				   unsigned int mss, struct sk_buff *skb,
 				   struct tcp_out_options *opts,
 				   struct tcp_md5sig_key **md5,
-				   struct tcp_extend_values *xvp,
 				   struct tcp_fastopen_cookie *foc)
 {
 	struct inet_request_sock *ireq = inet_rsk(req);
 	unsigned int remaining = MAX_TCP_OPTION_SPACE;
-	u8 cookie_plus = (xvp != NULL && !xvp->cookie_out_never) ?
-			 xvp->cookie_plus :
-			 0;
 
 #ifdef CONFIG_TCP_MD5SIG
 	*md5 = tcp_rsk(req)->af_specific->md5_lookup(sk, req);
@@ -757,28 +613,7 @@ static unsigned int tcp_synack_options(struct sock *sk,
 			remaining -= need;
 		}
 	}
-	/* Similar rationale to tcp_syn_options() applies here, too.
-	 * If the <SYN> options fit, the same options should fit now!
-	 */
-	if (*md5 == NULL &&
-	    ireq->tstamp_ok &&
-	    cookie_plus > TCPOLEN_COOKIE_BASE) {
-		int need = cookie_plus; /* has TCPOLEN_COOKIE_BASE */
-
-		if (0x2 & need) {
-			/* 32-bit multiple */
-			need += 2; /* NOPs */
-		}
-		if (need <= remaining) {
-			opts->options |= OPTION_COOKIE_EXTENSION;
-			opts->hash_size = cookie_plus - TCPOLEN_COOKIE_BASE;
-			remaining -= need;
-		} else {
-			/* There's no error return, so flag it. */
-			xvp->cookie_out_never = 1; /* true */
-			opts->hash_size = 0;
-		}
-	}
+
 	return MAX_TCP_OPTION_SPACE - remaining;
 }
 
@@ -806,7 +641,7 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb
 
 	if (likely(tp->rx_opt.tstamp_ok)) {
 		opts->options |= OPTION_TS;
-		opts->tsval = tcb ? tcb->when : 0;
+		opts->tsval = tcb ? tcb->when + tp->tsoffset : 0;
 		opts->tsecr = tp->rx_opt.ts_recent;
 		size += TCPOLEN_TSTAMP_ALIGNED;
 	}
@@ -953,7 +788,7 @@ void __init tcp_tasklet_init(void)
  * We cant xmit new skbs from this context, as we might already
  * hold qdisc lock.
  */
-static void tcp_wfree(struct sk_buff *skb)
+void tcp_wfree(struct sk_buff *skb)
 {
 	struct sock *sk = skb->sk;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -1012,6 +847,13 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 		__net_timestamp(skb);
 
 	if (likely(clone_it)) {
+		const struct sk_buff *fclone = skb + 1;
+
+		if (unlikely(skb->fclone == SKB_FCLONE_ORIG &&
+			     fclone->fclone == SKB_FCLONE_CLONE))
+			NET_INC_STATS_BH(sock_net(sk),
+					 LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES);
+
 		if (unlikely(skb_cloned(skb)))
 			skb = pskb_copy(skb, gfp_mask);
 		else
@@ -1032,11 +874,13 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 							   &md5);
 	tcp_header_size = tcp_options_size + sizeof(struct tcphdr);
 
-	if (tcp_packets_in_flight(tp) == 0) {
+	if (tcp_packets_in_flight(tp) == 0)
 		tcp_ca_event(sk, CA_EVENT_TX_START);
-		skb->ooo_okay = 1;
-	} else
-		skb->ooo_okay = 0;
+
+	/* if no packet is in qdisc/device queue, then allow XPS to select
+	 * another queue.
+	 */
+	skb->ooo_okay = sk_wmem_alloc_get(sk) == 0;
 
 	skb_push(skb, tcp_header_size);
 	skb_reset_transport_header(skb);
@@ -1298,7 +1142,6 @@ static void __pskb_trim_head(struct sk_buff *skb, int len)
 	eat = min_t(int, len, skb_headlen(skb));
 	if (eat) {
 		__skb_pull(skb, eat);
-		skb->avail_size -= eat;
 		len -= eat;
 		if (!len)
 			return;
@@ -1331,7 +1174,7 @@ static void __pskb_trim_head(struct sk_buff *skb, int len)
 /* Remove acked data from a packet in the transmit queue. */
 int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
 {
-	if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+	if (skb_unclone(skb, GFP_ATOMIC))
 		return -ENOMEM;
 
 	__pskb_trim_head(skb, len);
@@ -1351,8 +1194,8 @@ int tcp_trim_head(struct sock *sk, struct sk_buff *skb, u32 len)
 	return 0;
 }
 
-/* Calculate MSS. Not accounting for SACKs here.  */
-int tcp_mtu_to_mss(struct sock *sk, int pmtu)
+/* Calculate MSS not accounting any TCP options.  */
+static inline int __tcp_mtu_to_mss(struct sock *sk, int pmtu)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	const struct inet_connection_sock *icsk = inet_csk(sk);
@@ -1381,13 +1224,17 @@ int tcp_mtu_to_mss(struct sock *sk, int pmtu)
 	/* Then reserve room for full set of TCP options and 8 bytes of data */
 	if (mss_now < 48)
 		mss_now = 48;
-
-	/* Now subtract TCP options size, not including SACKs */
-	mss_now -= tp->tcp_header_len - sizeof(struct tcphdr);
-
 	return mss_now;
 }
 
+/* Calculate MSS. Not accounting for SACKs here.  */
+int tcp_mtu_to_mss(struct sock *sk, int pmtu)
+{
+	/* Subtract TCP options size, not including SACKs */
+	return __tcp_mtu_to_mss(sk, pmtu) -
+	       (tcp_sk(sk)->tcp_header_len - sizeof(struct tcphdr));
+}
+
 /* Inverse of above */
 int tcp_mss_to_mtu(struct sock *sk, int mss)
 {
@@ -1629,11 +1476,8 @@ static inline bool tcp_nagle_test(const struct tcp_sock *tp, const struct sk_buf
 	if (nonagle & TCP_NAGLE_PUSH)
 		return true;
 
-	/* Don't use the nagle rule for urgent data (or for the final FIN).
-	 * Nagle can be ignored during F-RTO too (see RFC4138).
-	 */
-	if (tcp_urg_mode(tp) || (tp->frto_counter == 2) ||
-	    (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN))
+	/* Don't use the nagle rule for urgent data (or for the final FIN). */
+	if (tcp_urg_mode(tp) || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN))
 		return true;
 
 	if (!tcp_nagle_check(tp, skb, cur_mss, nonagle))
@@ -1806,8 +1650,11 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
 			goto send_now;
 	}
 
-	/* Ok, it looks like it is advisable to defer.  */
-	tp->tso_deferred = 1 | (jiffies << 1);
+	/* Ok, it looks like it is advisable to defer.
+	 * Do not rearm the timer if already set to not break TCP ACK clocking.
+	 */
+	if (!tp->tso_deferred)
+		tp->tso_deferred = 1 | (jiffies << 1);
 
 	return true;
 
@@ -1955,6 +1802,9 @@ static int tcp_mtu_probe(struct sock *sk)
  * snd_up-64k-mss .. snd_up cannot be large. However, taking into
  * account rare use of URG, this is not a big flaw.
  *
+ * Send at most one packet when push_one > 0. Temporarily ignore
+ * cwnd limit to force at most one packet out when push_one == 2.
+
  * Returns true, if no segments are in flight and we have queued segments,
  * but cannot send anything now because of SWS or another problem.
  */
@@ -1990,8 +1840,13 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
 			goto repair; /* Skip network transmission */
 
 		cwnd_quota = tcp_cwnd_test(tp, skb);
-		if (!cwnd_quota)
-			break;
+		if (!cwnd_quota) {
+			if (push_one == 2)
+				/* Force out a loss probe pkt. */
+				cwnd_quota = 1;
+			else
+				break;
+		}
 
 		if (unlikely(!tcp_snd_wnd_test(tp, skb, mss_now)))
 			break;
@@ -2045,10 +1900,129 @@ repair:
 	if (likely(sent_pkts)) {
 		if (tcp_in_cwnd_reduction(sk))
 			tp->prr_out += sent_pkts;
+
+		/* Send one loss probe per tail loss episode. */
+		if (push_one != 2)
+			tcp_schedule_loss_probe(sk);
 		tcp_cwnd_validate(sk);
 		return false;
 	}
-	return !tp->packets_out && tcp_send_head(sk);
+	return (push_one == 2) || (!tp->packets_out && tcp_send_head(sk));
+}
+
+bool tcp_schedule_loss_probe(struct sock *sk)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	struct tcp_sock *tp = tcp_sk(sk);
+	u32 timeout, tlp_time_stamp, rto_time_stamp;
+	u32 rtt = tp->srtt >> 3;
+
+	if (WARN_ON(icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS))
+		return false;
+	/* No consecutive loss probes. */
+	if (WARN_ON(icsk->icsk_pending == ICSK_TIME_LOSS_PROBE)) {
+		tcp_rearm_rto(sk);
+		return false;
+	}
+	/* Don't do any loss probe on a Fast Open connection before 3WHS
+	 * finishes.
+	 */
+	if (sk->sk_state == TCP_SYN_RECV)
+		return false;
+
+	/* TLP is only scheduled when next timer event is RTO. */
+	if (icsk->icsk_pending != ICSK_TIME_RETRANS)
+		return false;
+
+	/* Schedule a loss probe in 2*RTT for SACK capable connections
+	 * in Open state, that are either limited by cwnd or application.
+	 */
+	if (sysctl_tcp_early_retrans < 3 || !rtt || !tp->packets_out ||
+	    !tcp_is_sack(tp) || inet_csk(sk)->icsk_ca_state != TCP_CA_Open)
+		return false;
+
+	if ((tp->snd_cwnd > tcp_packets_in_flight(tp)) &&
+	     tcp_send_head(sk))
+		return false;
+
+	/* Probe timeout is at least 1.5*rtt + TCP_DELACK_MAX to account
+	 * for delayed ack when there's one outstanding packet.
+	 */
+	timeout = rtt << 1;
+	if (tp->packets_out == 1)
+		timeout = max_t(u32, timeout,
+				(rtt + (rtt >> 1) + TCP_DELACK_MAX));
+	timeout = max_t(u32, timeout, msecs_to_jiffies(10));
+
+	/* If RTO is shorter, just schedule TLP in its place. */
+	tlp_time_stamp = tcp_time_stamp + timeout;
+	rto_time_stamp = (u32)inet_csk(sk)->icsk_timeout;
+	if ((s32)(tlp_time_stamp - rto_time_stamp) > 0) {
+		s32 delta = rto_time_stamp - tcp_time_stamp;
+		if (delta > 0)
+			timeout = delta;
+	}
+
+	inet_csk_reset_xmit_timer(sk, ICSK_TIME_LOSS_PROBE, timeout,
+				  TCP_RTO_MAX);
+	return true;
+}
+
+/* When probe timeout (PTO) fires, send a new segment if one exists, else
+ * retransmit the last segment.
+ */
+void tcp_send_loss_probe(struct sock *sk)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct sk_buff *skb;
+	int pcount;
+	int mss = tcp_current_mss(sk);
+	int err = -1;
+
+	if (tcp_send_head(sk) != NULL) {
+		err = tcp_write_xmit(sk, mss, TCP_NAGLE_OFF, 2, GFP_ATOMIC);
+		goto rearm_timer;
+	}
+
+	/* At most one outstanding TLP retransmission. */
+	if (tp->tlp_high_seq)
+		goto rearm_timer;
+
+	/* Retransmit last segment. */
+	skb = tcp_write_queue_tail(sk);
+	if (WARN_ON(!skb))
+		goto rearm_timer;
+
+	pcount = tcp_skb_pcount(skb);
+	if (WARN_ON(!pcount))
+		goto rearm_timer;
+
+	if ((pcount > 1) && (skb->len > (pcount - 1) * mss)) {
+		if (unlikely(tcp_fragment(sk, skb, (pcount - 1) * mss, mss)))
+			goto rearm_timer;
+		skb = tcp_write_queue_tail(sk);
+	}
+
+	if (WARN_ON(!skb || !tcp_skb_pcount(skb)))
+		goto rearm_timer;
+
+	/* Probe with zero data doesn't trigger fast recovery. */
+	if (skb->len > 0)
+		err = __tcp_retransmit_skb(sk, skb);
+
+	/* Record snd_nxt for loss detection. */
+	if (likely(!err))
+		tp->tlp_high_seq = tp->snd_nxt;
+
+rearm_timer:
+	inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+				  inet_csk(sk)->icsk_rto,
+				  TCP_RTO_MAX);
+
+	if (likely(!err))
+		NET_INC_STATS_BH(sock_net(sk),
+				 LINUX_MIB_TCPLOSSPROBES);
+	return;
 }
 
 /* Push out any pending frames which were held back due to
@@ -2382,8 +2356,12 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 	 */
 	TCP_SKB_CB(skb)->when = tcp_time_stamp;
 
-	/* make sure skb->data is aligned on arches that require it */
-	if (unlikely(NET_IP_ALIGN && ((unsigned long)skb->data & 3))) {
+	/* make sure skb->data is aligned on arches that require it
+	 * and check if ack-trimming & collapsing extended the headroom
+	 * beyond what csum_start can cover.
+	 */
+	if (unlikely((NET_IP_ALIGN && ((unsigned long)skb->data & 3)) ||
+		     skb_headroom(skb) >= 0xFFFF)) {
 		struct sk_buff *nskb = __pskb_copy(skb, MAX_TCP_HEADER,
 						   GFP_ATOMIC);
 		return nskb ? tcp_transmit_skb(sk, nskb, 0, GFP_ATOMIC) :
@@ -2669,32 +2647,24 @@ int tcp_send_synack(struct sock *sk)
  * sk: listener socket
  * dst: dst entry attached to the SYNACK
  * req: request_sock pointer
- * rvp: request_values pointer
  *
  * Allocate one skb and build a SYNACK packet.
  * @dst is consumed : Caller should not use it again.
  */
 struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 				struct request_sock *req,
-				struct request_values *rvp,
 				struct tcp_fastopen_cookie *foc)
 {
 	struct tcp_out_options opts;
-	struct tcp_extend_values *xvp = tcp_xv(rvp);
 	struct inet_request_sock *ireq = inet_rsk(req);
 	struct tcp_sock *tp = tcp_sk(sk);
-	const struct tcp_cookie_values *cvp = tp->cookie_values;
 	struct tcphdr *th;
 	struct sk_buff *skb;
 	struct tcp_md5sig_key *md5;
 	int tcp_header_size;
 	int mss;
-	int s_data_desired = 0;
 
-	if (cvp != NULL && cvp->s_data_constant && cvp->s_data_desired)
-		s_data_desired = cvp->s_data_desired;
-	skb = alloc_skb(MAX_TCP_HEADER + 15 + s_data_desired,
-			sk_gfp_atomic(sk, GFP_ATOMIC));
+	skb = alloc_skb(MAX_TCP_HEADER + 15, sk_gfp_atomic(sk, GFP_ATOMIC));
 	if (unlikely(!skb)) {
 		dst_release(dst);
 		return NULL;
@@ -2703,6 +2673,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 	skb_reserve(skb, MAX_TCP_HEADER);
 
 	skb_dst_set(skb, dst);
+	security_skb_owned_by(skb, sk);
 
 	mss = dst_metric_advmss(dst);
 	if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < mss)
@@ -2736,9 +2707,8 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 	else
 #endif
 	TCP_SKB_CB(skb)->when = tcp_time_stamp;
-	tcp_header_size = tcp_synack_options(sk, req, mss,
-					     skb, &opts, &md5, xvp, foc)
-			+ sizeof(*th);
+	tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, &md5,
+					     foc) + sizeof(*th);
 
 	skb_push(skb, tcp_header_size);
 	skb_reset_transport_header(skb);
@@ -2756,40 +2726,6 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 	tcp_init_nondata_skb(skb, tcp_rsk(req)->snt_isn,
 			     TCPHDR_SYN | TCPHDR_ACK);
 
-	if (OPTION_COOKIE_EXTENSION & opts.options) {
-		if (s_data_desired) {
-			u8 *buf = skb_put(skb, s_data_desired);
-
-			/* copy data directly from the listening socket. */
-			memcpy(buf, cvp->s_data_payload, s_data_desired);
-			TCP_SKB_CB(skb)->end_seq += s_data_desired;
-		}
-
-		if (opts.hash_size > 0) {
-			__u32 workspace[SHA_WORKSPACE_WORDS];
-			u32 *mess = &xvp->cookie_bakery[COOKIE_DIGEST_WORDS];
-			u32 *tail = &mess[COOKIE_MESSAGE_WORDS-1];
-
-			/* Secret recipe depends on the Timestamp, (future)
-			 * Sequence and Acknowledgment Numbers, Initiator
-			 * Cookie, and others handled by IP variant caller.
-			 */
-			*tail-- ^= opts.tsval;
-			*tail-- ^= tcp_rsk(req)->rcv_isn + 1;
-			*tail-- ^= TCP_SKB_CB(skb)->seq + 1;
-
-			/* recommended */
-			*tail-- ^= (((__force u32)th->dest << 16) | (__force u32)th->source);
-			*tail-- ^= (u32)(unsigned long)cvp; /* per sockopt */
-
-			sha_transform((__u32 *)&xvp->cookie_bakery[0],
-				      (char *)mess,
-				      &workspace[0]);
-			opts.hash_location =
-				(__u8 *)&xvp->cookie_bakery[0];
-		}
-	}
-
 	th->seq = htonl(TCP_SKB_CB(skb)->seq);
 	/* XXX data is queued and acked as is. No buffer/window check */
 	th->ack_seq = htonl(tcp_rsk(req)->rcv_nxt);
@@ -2930,7 +2866,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
 	 */
 	if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < tp->rx_opt.mss_clamp)
 		tp->rx_opt.mss_clamp = tp->rx_opt.user_mss;
-	space = tcp_mtu_to_mss(sk, inet_csk(sk)->icsk_pmtu_cookie) -
+	space = __tcp_mtu_to_mss(sk, inet_csk(sk)->icsk_pmtu_cookie) -
 		MAX_TCP_OPTION_SPACE;
 
 	syn_data = skb_copy_expand(syn, skb_headroom(syn), space,
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c
index 4526fe6..d4943f6 100644
--- a/net/ipv4/tcp_probe.c
+++ b/net/ipv4/tcp_probe.c
@@ -234,7 +234,7 @@ static __init int tcpprobe_init(void)
 	if (!tcp_probe.log)
 		goto err0;
 
-	if (!proc_net_fops_create(&init_net, procname, S_IRUSR, &tcpprobe_fops))
+	if (!proc_create(procname, S_IRUSR, init_net.proc_net, &tcpprobe_fops))
 		goto err0;
 
 	ret = register_jprobe(&tcp_jprobe);
@@ -244,7 +244,7 @@ static __init int tcpprobe_init(void)
 	pr_info("probe registered (port=%d) bufsize=%u\n", port, bufsize);
 	return 0;
  err1:
-	proc_net_remove(&init_net, procname);
+	remove_proc_entry(procname, init_net.proc_net);
  err0:
 	kfree(tcp_probe.log);
 	return ret;
@@ -253,7 +253,7 @@ module_init(tcpprobe_init);
 
 static __exit void tcpprobe_exit(void)
 {
-	proc_net_remove(&init_net, procname);
+	remove_proc_entry(procname, init_net.proc_net);
 	unregister_jprobe(&tcp_jprobe);
 	kfree(tcp_probe.log);
 }
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index b78aac3..4b85e6f 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -342,10 +342,6 @@ void tcp_retransmit_timer(struct sock *sk)
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct inet_connection_sock *icsk = inet_csk(sk);
 
-	if (tp->early_retrans_delayed) {
-		tcp_resume_early_retransmit(sk);
-		return;
-	}
 	if (tp->fastopen_rsk) {
 		WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&
 			     sk->sk_state != TCP_FIN_WAIT1);
@@ -360,6 +356,8 @@ void tcp_retransmit_timer(struct sock *sk)
 
 	WARN_ON(tcp_write_queue_empty(sk));
 
+	tp->tlp_high_seq = 0;
+
 	if (!tp->snd_wnd && !sock_flag(sk, SOCK_DEAD) &&
 	    !((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))) {
 		/* Receiver dastardly shrinks window. Our retransmits
@@ -418,11 +416,7 @@ void tcp_retransmit_timer(struct sock *sk)
 		NET_INC_STATS_BH(sock_net(sk), mib_idx);
 	}
 
-	if (tcp_use_frto(sk)) {
-		tcp_enter_frto(sk);
-	} else {
-		tcp_enter_loss(sk, 0);
-	}
+	tcp_enter_loss(sk, 0);
 
 	if (tcp_retransmit_skb(sk, tcp_write_queue_head(sk)) > 0) {
 		/* Retransmission failed because of local congestion,
@@ -495,13 +489,20 @@ void tcp_write_timer_handler(struct sock *sk)
 	}
 
 	event = icsk->icsk_pending;
-	icsk->icsk_pending = 0;
 
 	switch (event) {
+	case ICSK_TIME_EARLY_RETRANS:
+		tcp_resume_early_retransmit(sk);
+		break;
+	case ICSK_TIME_LOSS_PROBE:
+		tcp_send_loss_probe(sk);
+		break;
 	case ICSK_TIME_RETRANS:
+		icsk->icsk_pending = 0;
 		tcp_retransmit_timer(sk);
 		break;
 	case ICSK_TIME_PROBE0:
+		icsk->icsk_pending = 0;
 		tcp_probe_timer(sk);
 		break;
 	}
diff --git a/net/ipv4/tcp_westwood.c b/net/ipv4/tcp_westwood.c
index 1b91bf4..76a1e23 100644
--- a/net/ipv4/tcp_westwood.c
+++ b/net/ipv4/tcp_westwood.c
@@ -236,7 +236,7 @@ static void tcp_westwood_event(struct sock *sk, enum tcp_ca_event event)
 		tp->snd_cwnd = tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
 		break;
 
-	case CA_EVENT_FRTO:
+	case CA_EVENT_LOSS:
 		tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
 		/* Update RTT_min when next ack arrives */
 		w->reset_rtt_min = 1;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1f4d405..0bf5d39 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -139,6 +139,7 @@ static int udp_lib_lport_inuse(struct net *net, __u16 num,
 {
 	struct sock *sk2;
 	struct hlist_nulls_node *node;
+	kuid_t uid = sock_i_uid(sk);
 
 	sk_nulls_for_each(sk2, node, &hslot->head)
 		if (net_eq(sock_net(sk2), net) &&
@@ -147,6 +148,8 @@ static int udp_lib_lport_inuse(struct net *net, __u16 num,
 		    (!sk2->sk_reuse || !sk->sk_reuse) &&
 		    (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
 		     sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+		    (!sk2->sk_reuseport || !sk->sk_reuseport ||
+		      !uid_eq(uid, sock_i_uid(sk2))) &&
 		    (*saddr_comp)(sk, sk2)) {
 			if (bitmap)
 				__set_bit(udp_sk(sk2)->udp_port_hash >> log,
@@ -169,6 +172,7 @@ static int udp_lib_lport_inuse2(struct net *net, __u16 num,
 {
 	struct sock *sk2;
 	struct hlist_nulls_node *node;
+	kuid_t uid = sock_i_uid(sk);
 	int res = 0;
 
 	spin_lock(&hslot2->lock);
@@ -179,6 +183,8 @@ static int udp_lib_lport_inuse2(struct net *net, __u16 num,
 		    (!sk2->sk_reuse || !sk->sk_reuse) &&
 		    (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
 		     sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+		    (!sk2->sk_reuseport || !sk->sk_reuseport ||
+		      !uid_eq(uid, sock_i_uid(sk2))) &&
 		    (*saddr_comp)(sk, sk2)) {
 			res = 1;
 			break;
@@ -337,26 +343,26 @@ static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr,
 			!ipv6_only_sock(sk)) {
 		struct inet_sock *inet = inet_sk(sk);
 
-		score = (sk->sk_family == PF_INET ? 1 : 0);
+		score = (sk->sk_family == PF_INET ? 2 : 1);
 		if (inet->inet_rcv_saddr) {
 			if (inet->inet_rcv_saddr != daddr)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (inet->inet_daddr) {
 			if (inet->inet_daddr != saddr)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (inet->inet_dport) {
 			if (inet->inet_dport != sport)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (sk->sk_bound_dev_if) {
 			if (sk->sk_bound_dev_if != dif)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 	}
 	return score;
@@ -365,7 +371,6 @@ static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr,
 /*
  * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num)
  */
-#define SCORE2_MAX (1 + 2 + 2 + 2)
 static inline int compute_score2(struct sock *sk, struct net *net,
 				 __be32 saddr, __be16 sport,
 				 __be32 daddr, unsigned int hnum, int dif)
@@ -380,21 +385,21 @@ static inline int compute_score2(struct sock *sk, struct net *net,
 		if (inet->inet_num != hnum)
 			return -1;
 
-		score = (sk->sk_family == PF_INET ? 1 : 0);
+		score = (sk->sk_family == PF_INET ? 2 : 1);
 		if (inet->inet_daddr) {
 			if (inet->inet_daddr != saddr)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (inet->inet_dport) {
 			if (inet->inet_dport != sport)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 		if (sk->sk_bound_dev_if) {
 			if (sk->sk_bound_dev_if != dif)
 				return -1;
-			score += 2;
+			score += 4;
 		}
 	}
 	return score;
@@ -409,19 +414,29 @@ static struct sock *udp4_lib_lookup2(struct net *net,
 {
 	struct sock *sk, *result;
 	struct hlist_nulls_node *node;
-	int score, badness;
+	int score, badness, matches = 0, reuseport = 0;
+	u32 hash = 0;
 
 begin:
 	result = NULL;
-	badness = -1;
+	badness = 0;
 	udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
 		score = compute_score2(sk, net, saddr, sport,
 				      daddr, hnum, dif);
 		if (score > badness) {
 			result = sk;
 			badness = score;
-			if (score == SCORE2_MAX)
-				goto exact_match;
+			reuseport = sk->sk_reuseport;
+			if (reuseport) {
+				hash = inet_ehashfn(net, daddr, hnum,
+						    saddr, htons(sport));
+				matches = 1;
+			}
+		} else if (score == badness && reuseport) {
+			matches++;
+			if (((u64)hash * matches) >> 32 == 0)
+				result = sk;
+			hash = next_pseudo_random32(hash);
 		}
 	}
 	/*
@@ -431,9 +446,7 @@ begin:
 	 */
 	if (get_nulls_value(node) != slot2)
 		goto begin;
-
 	if (result) {
-exact_match:
 		if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
 			result = NULL;
 		else if (unlikely(compute_score2(result, net, saddr, sport,
@@ -457,7 +470,8 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 	unsigned short hnum = ntohs(dport);
 	unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
 	struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
-	int score, badness;
+	int score, badness, matches = 0, reuseport = 0;
+	u32 hash = 0;
 
 	rcu_read_lock();
 	if (hslot->count > 10) {
@@ -486,13 +500,24 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 	}
 begin:
 	result = NULL;
-	badness = -1;
+	badness = 0;
 	sk_nulls_for_each_rcu(sk, node, &hslot->head) {
 		score = compute_score(sk, net, saddr, hnum, sport,
 				      daddr, dport, dif);
 		if (score > badness) {
 			result = sk;
 			badness = score;
+			reuseport = sk->sk_reuseport;
+			if (reuseport) {
+				hash = inet_ehashfn(net, daddr, hnum,
+						    saddr, htons(sport));
+				matches = 1;
+			}
+		} else if (score == badness && reuseport) {
+			matches++;
+			if (((u64)hash * matches) >> 32 == 0)
+				result = sk;
+			hash = next_pseudo_random32(hash);
 		}
 	}
 	/*
@@ -877,9 +902,9 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	ipc.addr = inet->inet_saddr;
 
 	ipc.oif = sk->sk_bound_dev_if;
-	err = sock_tx_timestamp(sk, &ipc.tx_flags);
-	if (err)
-		return err;
+
+	sock_tx_timestamp(sk, &ipc.tx_flags);
+
 	if (msg->msg_controllen) {
 		err = ip_cmsg_send(sock_net(sk), msg, &ipc);
 		if (err)
@@ -971,7 +996,7 @@ back_from_confirm:
 				  sizeof(struct udphdr), &ipc, &rt,
 				  msg->msg_flags);
 		err = PTR_ERR(skb);
-		if (skb && !IS_ERR(skb))
+		if (!IS_ERR_OR_NULL(skb))
 			err = udp_send_skb(skb, fl4);
 		goto out;
 	}
@@ -1106,6 +1131,8 @@ static unsigned int first_packet_length(struct sock *sk)
 	spin_lock_bh(&rcvq->lock);
 	while ((skb = skb_peek(rcvq)) != NULL &&
 		udp_lib_checksum_complete(skb)) {
+		UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS,
+				 IS_UDPLITE(sk));
 		UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
 				 IS_UDPLITE(sk));
 		atomic_inc(&sk->sk_drops);
@@ -1261,8 +1288,10 @@ out:
 
 csum_copy_err:
 	slow = lock_sock_fast(sk);
-	if (!skb_kill_datagram(sk, skb, flags))
+	if (!skb_kill_datagram(sk, skb, flags)) {
+		UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
 		UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+	}
 	unlock_sock_fast(sk, slow);
 
 	if (noblock)
@@ -1488,7 +1517,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 	if (rcu_access_pointer(sk->sk_filter) &&
 	    udp_lib_checksum_complete(skb))
-		goto drop;
+		goto csum_error;
 
 
 	if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
@@ -1508,6 +1537,8 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 	return rc;
 
+csum_error:
+	UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
 drop:
 	UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
 	atomic_inc(&sk->sk_drops);
@@ -1724,6 +1755,7 @@ csum_error:
 		       proto == IPPROTO_UDPLITE ? "Lite" : "",
 		       &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest),
 		       ulen);
+	UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
 drop:
 	UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
 	kfree_skb(skb);
@@ -1737,9 +1769,16 @@ int udp_rcv(struct sk_buff *skb)
 
 void udp_destroy_sock(struct sock *sk)
 {
+	struct udp_sock *up = udp_sk(sk);
 	bool slow = lock_sock_fast(sk);
 	udp_flush_pending_frames(sk);
 	unlock_sock_fast(sk, slow);
+	if (static_key_false(&udp_encap_needed) && up->encap_type) {
+		void (*encap_destroy)(struct sock *sk);
+		encap_destroy = ACCESS_ONCE(up->encap_destroy);
+		if (encap_destroy)
+			encap_destroy(sk);
+	}
 }
 
 /*
@@ -2061,7 +2100,7 @@ static void udp_seq_stop(struct seq_file *seq, void *v)
 
 int udp_seq_open(struct inode *inode, struct file *file)
 {
-	struct udp_seq_afinfo *afinfo = PDE(inode)->data;
+	struct udp_seq_afinfo *afinfo = PDE_DATA(inode);
 	struct udp_iter_state *s;
 	int err;
 
@@ -2097,7 +2136,7 @@ EXPORT_SYMBOL(udp_proc_register);
 
 void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo)
 {
-	proc_net_remove(net, afinfo->name);
+	remove_proc_entry(afinfo->name, net->proc_net);
 }
 EXPORT_SYMBOL(udp_proc_unregister);
 
@@ -2247,31 +2286,91 @@ void __init udp_init(void)
 
 int udp4_ufo_send_check(struct sk_buff *skb)
 {
-	const struct iphdr *iph;
-	struct udphdr *uh;
-
-	if (!pskb_may_pull(skb, sizeof(*uh)))
+	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
 		return -EINVAL;
 
-	iph = ip_hdr(skb);
-	uh = udp_hdr(skb);
+	if (likely(!skb->encapsulation)) {
+		const struct iphdr *iph;
+		struct udphdr *uh;
 
-	uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
-				       IPPROTO_UDP, 0);
-	skb->csum_start = skb_transport_header(skb) - skb->head;
-	skb->csum_offset = offsetof(struct udphdr, check);
-	skb->ip_summed = CHECKSUM_PARTIAL;
+		iph = ip_hdr(skb);
+		uh = udp_hdr(skb);
+
+		uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
+				IPPROTO_UDP, 0);
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		skb->ip_summed = CHECKSUM_PARTIAL;
+	}
 	return 0;
 }
 
+static struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
+		netdev_features_t features)
+{
+	struct sk_buff *segs = ERR_PTR(-EINVAL);
+	int mac_len = skb->mac_len;
+	int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
+	__be16 protocol = skb->protocol;
+	netdev_features_t enc_features;
+	int outer_hlen;
+
+	if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
+		goto out;
+
+	skb->encapsulation = 0;
+	__skb_pull(skb, tnl_hlen);
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb_inner_network_offset(skb));
+	skb->mac_len = skb_inner_network_offset(skb);
+	skb->protocol = htons(ETH_P_TEB);
+
+	/* segment inner packet. */
+	enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
+	segs = skb_mac_gso_segment(skb, enc_features);
+	if (!segs || IS_ERR(segs))
+		goto out;
+
+	outer_hlen = skb_tnl_header_len(skb);
+	skb = segs;
+	do {
+		struct udphdr *uh;
+		int udp_offset = outer_hlen - tnl_hlen;
+
+		skb->mac_len = mac_len;
+
+		skb_push(skb, outer_hlen);
+		skb_reset_mac_header(skb);
+		skb_set_network_header(skb, mac_len);
+		skb_set_transport_header(skb, udp_offset);
+		uh = udp_hdr(skb);
+		uh->len = htons(skb->len - udp_offset);
+
+		/* csum segment if tunnel sets skb with csum. */
+		if (unlikely(uh->check)) {
+			struct iphdr *iph = ip_hdr(skb);
+
+			uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
+						       skb->len - udp_offset,
+						       IPPROTO_UDP, 0);
+			uh->check = csum_fold(skb_checksum(skb, udp_offset,
+							   skb->len - udp_offset, 0));
+			if (uh->check == 0)
+				uh->check = CSUM_MANGLED_0;
+
+		}
+		skb->ip_summed = CHECKSUM_NONE;
+		skb->protocol = protocol;
+	} while ((skb = skb->next));
+out:
+	return segs;
+}
+
 struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 	netdev_features_t features)
 {
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
 	unsigned int mss;
-	int offset;
-	__wsum csum;
-
 	mss = skb_shinfo(skb)->gso_size;
 	if (unlikely(skb->len <= mss))
 		goto out;
@@ -2280,7 +2379,9 @@ struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 		/* Packet is from an untrusted source, reset gso_segs. */
 		int type = skb_shinfo(skb)->gso_type;
 
-		if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
+		if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
+				      SKB_GSO_UDP_TUNNEL |
+				      SKB_GSO_GRE) ||
 			     !(type & (SKB_GSO_UDP))))
 			goto out;
 
@@ -2290,20 +2391,27 @@ struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 		goto out;
 	}
 
-	/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
-	 * do checksum of UDP packets sent as multiple IP fragments.
-	 */
-	offset = skb_checksum_start_offset(skb);
-	csum = skb_checksum(skb, offset, skb->len - offset, 0);
-	offset += skb->csum_offset;
-	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
-	skb->ip_summed = CHECKSUM_NONE;
-
 	/* Fragment the skb. IP headers of the fragments are updated in
 	 * inet_gso_segment()
 	 */
-	segs = skb_segment(skb, features);
+	if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL)
+		segs = skb_udp_tunnel_segment(skb, features);
+	else {
+		int offset;
+		__wsum csum;
+
+		/* Do software UFO. Complete and fill in the UDP checksum as
+		 * HW cannot do checksum of UDP packets sent as multiple
+		 * IP fragments.
+		 */
+		offset = skb_checksum_start_offset(skb);
+		csum = skb_checksum(skb, offset, skb->len - offset, 0);
+		offset += skb->csum_offset;
+		*(__sum16 *)(skb->data + offset) = csum_fold(csum);
+		skb->ip_summed = CHECKSUM_NONE;
+
+		segs = skb_segment(skb, features);
+	}
 out:
 	return segs;
 }
-
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c
index 505b30a..7927db0 100644
--- a/net/ipv4/udp_diag.c
+++ b/net/ipv4/udp_diag.c
@@ -25,7 +25,7 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
 		return 0;
 
 	return inet_sk_diag_fill(sk, NULL, skb, req,
-			sk_user_ns(NETLINK_CB(cb->skb).ssk),
+			sk_user_ns(NETLINK_CB(cb->skb).sk),
 			NETLINK_CB(cb->skb).portid,
 			cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
 }
@@ -64,14 +64,14 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
 		goto out;
 
 	err = -ENOMEM;
-	rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
-				     sizeof(struct inet_diag_meminfo) +
-				     64)), GFP_KERNEL);
+	rep = nlmsg_new(sizeof(struct inet_diag_msg) +
+			sizeof(struct inet_diag_meminfo) + 64,
+			GFP_KERNEL);
 	if (!rep)
 		goto out;
 
 	err = inet_sk_diag_fill(sk, NULL, rep, req,
-			   sk_user_ns(NETLINK_CB(in_skb).ssk),
+			   sk_user_ns(NETLINK_CB(in_skb).sk),
 			   NETLINK_CB(in_skb).portid,
 			   nlh->nlmsg_seq, 0, nlh);
 	if (err < 0) {
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 06814b6..1f12c8b 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -132,7 +132,7 @@ int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
 	 * header and optional ESP marker bytes) and then modify the
 	 * protocol to ESP, and then call into the transform receiver.
 	 */
-	if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+	if (skb_unclone(skb, GFP_ATOMIC))
 		goto drop;
 
 	/* Now we can update and verify the packet length... */
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index ddee0a0..eb1dd4d 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -103,8 +103,12 @@ static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 
 	top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
 
-	/* DS disclosed */
-	top_iph->tos = INET_ECN_encapsulate(XFRM_MODE_SKB_CB(skb)->tos,
+	/* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
+	if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
+		top_iph->tos = 0;
+	else
+		top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
+	top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
 					    XFRM_MODE_SKB_CB(skb)->tos);
 
 	flags = x->props.flags;
@@ -142,8 +146,8 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 	for_each_input_rcu(rcv_notify_handlers, handler)
 		handler->handler(skb);
 
-	if (skb_cloned(skb) &&
-	    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
+	err = skb_unclone(skb, GFP_ATOMIC);
+	if (err)
 		goto out;
 
 	if (x->props.flags & XFRM_STATE_DECAP_DSCP)
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 3be0ac2..9a459be 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -262,21 +262,56 @@ static struct ctl_table xfrm4_policy_table[] = {
 	{ }
 };
 
-static struct ctl_table_header *sysctl_hdr;
-#endif
-
-static void __init xfrm4_policy_init(void)
+static int __net_init xfrm4_net_init(struct net *net)
 {
-	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
+	struct ctl_table *table;
+	struct ctl_table_header *hdr;
+
+	table = xfrm4_policy_table;
+	if (!net_eq(net, &init_net)) {
+		table = kmemdup(table, sizeof(xfrm4_policy_table), GFP_KERNEL);
+		if (!table)
+			goto err_alloc;
+
+		table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
+	}
+
+	hdr = register_net_sysctl(net, "net/ipv4", table);
+	if (!hdr)
+		goto err_reg;
+
+	net->ipv4.xfrm4_hdr = hdr;
+	return 0;
+
+err_reg:
+	if (!net_eq(net, &init_net))
+		kfree(table);
+err_alloc:
+	return -ENOMEM;
 }
 
-static void __exit xfrm4_policy_fini(void)
+static void __net_exit xfrm4_net_exit(struct net *net)
 {
-#ifdef CONFIG_SYSCTL
-	if (sysctl_hdr)
-		unregister_net_sysctl_table(sysctl_hdr);
+	struct ctl_table *table;
+
+	if (net->ipv4.xfrm4_hdr == NULL)
+		return;
+
+	table = net->ipv4.xfrm4_hdr->ctl_table_arg;
+	unregister_net_sysctl_table(net->ipv4.xfrm4_hdr);
+	if (!net_eq(net, &init_net))
+		kfree(table);
+}
+
+static struct pernet_operations __net_initdata xfrm4_net_ops = {
+	.init	= xfrm4_net_init,
+	.exit	= xfrm4_net_exit,
+};
 #endif
-	xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
+
+static void __init xfrm4_policy_init(void)
+{
+	xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
 }
 
 void __init xfrm4_init(void)
@@ -286,8 +321,7 @@ void __init xfrm4_init(void)
 	xfrm4_state_init();
 	xfrm4_policy_init();
 #ifdef CONFIG_SYSCTL
-	sysctl_hdr = register_net_sysctl(&init_net, "net/ipv4",
-					 xfrm4_policy_table);
+	register_pernet_subsys(&xfrm4_net_ops);
 #endif
 }
author	Scott Wood <scottwood@freescale.com>	2013-11-01 21:17:16 (GMT)
committer	Scott Wood <scottwood@freescale.com>	2013-11-03 22:47:10 (GMT)
commit	31110de40dca4d4aeff4f253b3def948b88fa590 (patch)
tree	0d811783836d52f15e37b4244de54f44ed4f93ad /net/ipv4
parent	ae60d5d27c429b13cf28a09ab8b9d30682433c5a (diff)
parent	8bb495e3f02401ee6f76d1b1d77f3ac9f079e376 (diff)
download	linux-fsl-qoriq-31110de40dca4d4aeff4f253b3def948b88fa590.tar.xz