Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 822 insertions, 0 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
new file mode 100644
index 0000000..87b9082
--- /dev/null
+++ b/net/ipv6/icmp.c
@@ -0,0 +1,822 @@
+/*
+ *	Internet Control Message Protocol (ICMPv6)
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *
+ *	$Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $
+ *
+ *	Based on net/ipv4/icmp.c
+ *
+ *	RFC 1885
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+/*
+ *	Changes:
+ *
+ *	Andi Kleen		:	exception handling
+ *	Andi Kleen			add rate limits. never reply to a icmp.
+ *					add more length checks and other fixes.
+ *	yoshfuji		:	ensure to sent parameter problem for
+ *					fragments.
+ *	YOSHIFUJI Hideaki @USAGI:	added sysctl for icmp rate limit.
+ *	Randy Dunlap and
+ *	YOSHIFUJI Hideaki @USAGI:	Per-interface statistics support
+ *	Kazunori MIYAZAWA @USAGI:       change output process to use ip6_append_data
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+
+#include <net/ip.h>
+#include <net/sock.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_checksum.h>
+#include <net/protocol.h>
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/icmp.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
+
+/*
+ *	The ICMP socket(s). This is the most convenient way to flow control
+ *	our ICMP output as well as maintain a clean interface throughout
+ *	all layers. All Socketless IP sends will soon be gone.
+ *
+ *	On SMP we have one ICMP socket per-cpu.
+ */
+static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL;
+#define icmpv6_socket	__get_cpu_var(__icmpv6_socket)
+
+static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
+
+static struct inet6_protocol icmpv6_protocol = {
+	.handler	=	icmpv6_rcv,
+	.flags		=	INET6_PROTO_FINAL,
+};
+
+static __inline__ int icmpv6_xmit_lock(void)
+{
+	local_bh_disable();
+
+	if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) {
+		/* This can happen if the output path (f.e. SIT or
+		 * ip6ip6 tunnel) signals dst_link_failure() for an
+		 * outgoing ICMP6 packet.
+		 */
+		local_bh_enable();
+		return 1;
+	}
+	return 0;
+}
+
+static __inline__ void icmpv6_xmit_unlock(void)
+{
+	spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock);
+}
+
+/* 
+ * Slightly more convenient version of icmpv6_send.
+ */
+void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
+{
+	icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
+	kfree_skb(skb);
+}
+
+/*
+ * Figure out, may we reply to this packet with icmp error.
+ *
+ * We do not reply, if:
+ *	- it was icmp error message.
+ *	- it is truncated, so that it is known, that protocol is ICMPV6
+ *	  (i.e. in the middle of some exthdr)
+ *
+ *	--ANK (980726)
+ */
+
+static int is_ineligible(struct sk_buff *skb)
+{
+	int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data;
+	int len = skb->len - ptr;
+	__u8 nexthdr = skb->nh.ipv6h->nexthdr;
+
+	if (len < 0)
+		return 1;
+
+	ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, len);
+	if (ptr < 0)
+		return 0;
+	if (nexthdr == IPPROTO_ICMPV6) {
+		u8 _type, *tp;
+		tp = skb_header_pointer(skb,
+			ptr+offsetof(struct icmp6hdr, icmp6_type),
+			sizeof(_type), &_type);
+		if (tp == NULL ||
+		    !(*tp & ICMPV6_INFOMSG_MASK))
+			return 1;
+	}
+	return 0;
+}
+
+static int sysctl_icmpv6_time = 1*HZ; 
+
+/* 
+ * Check the ICMP output rate limit 
+ */
+static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
+				     struct flowi *fl)
+{
+	struct dst_entry *dst;
+	int res = 0;
+
+	/* Informational messages are not limited. */
+	if (type & ICMPV6_INFOMSG_MASK)
+		return 1;
+
+	/* Do not limit pmtu discovery, it would break it. */
+	if (type == ICMPV6_PKT_TOOBIG)
+		return 1;
+
+	/* 
+	 * Look up the output route.
+	 * XXX: perhaps the expire for routing entries cloned by
+	 * this lookup should be more aggressive (not longer than timeout).
+	 */
+	dst = ip6_route_output(sk, fl);
+	if (dst->error) {
+		IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
+	} else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
+		res = 1;
+	} else {
+		struct rt6_info *rt = (struct rt6_info *)dst;
+		int tmo = sysctl_icmpv6_time;
+
+		/* Give more bandwidth to wider prefixes. */
+		if (rt->rt6i_dst.plen < 128)
+			tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
+
+		res = xrlim_allow(dst, tmo);
+	}
+	dst_release(dst);
+	return res;
+}
+
+/*
+ *	an inline helper for the "simple" if statement below
+ *	checks if parameter problem report is caused by an
+ *	unrecognized IPv6 option that has the Option Type 
+ *	highest-order two bits set to 10
+ */
+
+static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
+{
+	u8 _optval, *op;
+
+	offset += skb->nh.raw - skb->data;
+	op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
+	if (op == NULL)
+		return 1;
+	return (*op & 0xC0) == 0x80;
+}
+
+static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len)
+{
+	struct sk_buff *skb;
+	struct icmp6hdr *icmp6h;
+	int err = 0;
+
+	if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+		goto out;
+
+	icmp6h = (struct icmp6hdr*) skb->h.raw;
+	memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
+	icmp6h->icmp6_cksum = 0;
+
+	if (skb_queue_len(&sk->sk_write_queue) == 1) {
+		skb->csum = csum_partial((char *)icmp6h,
+					sizeof(struct icmp6hdr), skb->csum);
+		icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
+						      &fl->fl6_dst,
+						      len, fl->proto,
+						      skb->csum);
+	} else {
+		u32 tmp_csum = 0;
+
+		skb_queue_walk(&sk->sk_write_queue, skb) {
+			tmp_csum = csum_add(tmp_csum, skb->csum);
+		}
+
+		tmp_csum = csum_partial((char *)icmp6h,
+					sizeof(struct icmp6hdr), tmp_csum);
+		tmp_csum = csum_ipv6_magic(&fl->fl6_src,
+					   &fl->fl6_dst,
+					   len, fl->proto, tmp_csum);
+		icmp6h->icmp6_cksum = tmp_csum;
+	}
+	if (icmp6h->icmp6_cksum == 0)
+		icmp6h->icmp6_cksum = -1;
+	ip6_push_pending_frames(sk);
+out:
+	return err;
+}
+
+struct icmpv6_msg {
+	struct sk_buff	*skb;
+	int		offset;
+};
+
+static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
+{
+	struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
+	struct sk_buff *org_skb = msg->skb;
+	__u32 csum = 0;
+
+	csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
+				      to, len, csum);
+	skb->csum = csum_block_add(skb->csum, csum, odd);
+	return 0;
+}
+
+/*
+ *	Send an ICMP message in response to a packet in error
+ */
+void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 
+		 struct net_device *dev)
+{
+	struct inet6_dev *idev = NULL;
+	struct ipv6hdr *hdr = skb->nh.ipv6h;
+	struct sock *sk = icmpv6_socket->sk;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct in6_addr *saddr = NULL;
+	struct dst_entry *dst;
+	struct icmp6hdr tmp_hdr;
+	struct flowi fl;
+	struct icmpv6_msg msg;
+	int iif = 0;
+	int addr_type = 0;
+	int len;
+	int hlimit;
+	int err = 0;
+
+	if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail)
+		return;
+
+	/*
+	 *	Make sure we respect the rules 
+	 *	i.e. RFC 1885 2.4(e)
+	 *	Rule (e.1) is enforced by not using icmpv6_send
+	 *	in any code that processes icmp errors.
+	 */
+	addr_type = ipv6_addr_type(&hdr->daddr);
+
+	if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0))
+		saddr = &hdr->daddr;
+
+	/*
+	 *	Dest addr check
+	 */
+
+	if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
+		if (type != ICMPV6_PKT_TOOBIG &&
+		    !(type == ICMPV6_PARAMPROB && 
+		      code == ICMPV6_UNK_OPTION && 
+		      (opt_unrec(skb, info))))
+			return;
+
+		saddr = NULL;
+	}
+
+	addr_type = ipv6_addr_type(&hdr->saddr);
+
+	/*
+	 *	Source addr check
+	 */
+
+	if (addr_type & IPV6_ADDR_LINKLOCAL)
+		iif = skb->dev->ifindex;
+
+	/*
+	 *	Must not send if we know that source is Anycast also.
+	 *	for now we don't know that.
+	 */
+	if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
+		LIMIT_NETDEBUG(
+			printk(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"));
+		return;
+	}
+
+	/* 
+	 *	Never answer to a ICMP packet.
+	 */
+	if (is_ineligible(skb)) {
+		LIMIT_NETDEBUG(
+			printk(KERN_DEBUG "icmpv6_send: no reply to icmp error\n")); 
+		return;
+	}
+
+	memset(&fl, 0, sizeof(fl));
+	fl.proto = IPPROTO_ICMPV6;
+	ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr);
+	if (saddr)
+		ipv6_addr_copy(&fl.fl6_src, saddr);
+	fl.oif = iif;
+	fl.fl_icmp_type = type;
+	fl.fl_icmp_code = code;
+
+	if (icmpv6_xmit_lock())
+		return;
+
+	if (!icmpv6_xrlim_allow(sk, type, &fl))
+		goto out;
+
+	tmp_hdr.icmp6_type = type;
+	tmp_hdr.icmp6_code = code;
+	tmp_hdr.icmp6_cksum = 0;
+	tmp_hdr.icmp6_pointer = htonl(info);
+
+	if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
+		fl.oif = np->mcast_oif;
+
+	err = ip6_dst_lookup(sk, &dst, &fl);
+	if (err)
+		goto out;
+	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+		goto out_dst_release;
+
+	if (ipv6_addr_is_multicast(&fl.fl6_dst))
+		hlimit = np->mcast_hops;
+	else
+		hlimit = np->hop_limit;
+	if (hlimit < 0)
+		hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+	if (hlimit < 0)
+		hlimit = ipv6_get_hoplimit(dst->dev);
+
+	msg.skb = skb;
+	msg.offset = skb->nh.raw - skb->data;
+
+	len = skb->len - msg.offset;
+	len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
+	if (len < 0) {
+		LIMIT_NETDEBUG(
+			printk(KERN_DEBUG "icmp: len problem\n"));
+		goto out_dst_release;
+	}
+
+	idev = in6_dev_get(skb->dev);
+
+	err = ip6_append_data(sk, icmpv6_getfrag, &msg,
+			      len + sizeof(struct icmp6hdr),
+			      sizeof(struct icmp6hdr),
+			      hlimit, NULL, &fl, (struct rt6_info*)dst,
+			      MSG_DONTWAIT);
+	if (err) {
+		ip6_flush_pending_frames(sk);
+		goto out_put;
+	}
+	err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
+
+	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
+		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
+	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+
+out_put:
+	if (likely(idev != NULL))
+		in6_dev_put(idev);
+out_dst_release:
+	dst_release(dst);
+out:
+	icmpv6_xmit_unlock();
+}
+
+static void icmpv6_echo_reply(struct sk_buff *skb)
+{
+	struct sock *sk = icmpv6_socket->sk;
+	struct inet6_dev *idev;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct in6_addr *saddr = NULL;
+	struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw;
+	struct icmp6hdr tmp_hdr;
+	struct flowi fl;
+	struct icmpv6_msg msg;
+	struct dst_entry *dst;
+	int err = 0;
+	int hlimit;
+
+	saddr = &skb->nh.ipv6h->daddr;
+
+	if (!ipv6_unicast_destination(skb))
+		saddr = NULL;
+
+	memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
+	tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
+
+	memset(&fl, 0, sizeof(fl));
+	fl.proto = IPPROTO_ICMPV6;
+	ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
+	if (saddr)
+		ipv6_addr_copy(&fl.fl6_src, saddr);
+	fl.oif = skb->dev->ifindex;
+	fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
+
+	if (icmpv6_xmit_lock())
+		return;
+
+	if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
+		fl.oif = np->mcast_oif;
+
+	err = ip6_dst_lookup(sk, &dst, &fl);
+	if (err)
+		goto out;
+	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+		goto out_dst_release;
+
+	if (ipv6_addr_is_multicast(&fl.fl6_dst))
+		hlimit = np->mcast_hops;
+	else
+		hlimit = np->hop_limit;
+	if (hlimit < 0)
+		hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+	if (hlimit < 0)
+		hlimit = ipv6_get_hoplimit(dst->dev);
+
+	idev = in6_dev_get(skb->dev);
+
+	msg.skb = skb;
+	msg.offset = 0;
+
+	err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
+				sizeof(struct icmp6hdr), hlimit, NULL, &fl,
+				(struct rt6_info*)dst, MSG_DONTWAIT);
+
+	if (err) {
+		ip6_flush_pending_frames(sk);
+		goto out_put;
+	}
+	err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
+
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES);
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+
+out_put: 
+	if (likely(idev != NULL))
+		in6_dev_put(idev);
+out_dst_release:
+	dst_release(dst);
+out: 
+	icmpv6_xmit_unlock();
+}
+
+static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info)
+{
+	struct in6_addr *saddr, *daddr;
+	struct inet6_protocol *ipprot;
+	struct sock *sk;
+	int inner_offset;
+	int hash;
+	u8 nexthdr;
+
+	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+		return;
+
+	nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
+	if (ipv6_ext_hdr(nexthdr)) {
+		/* now skip over extension headers */
+		inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, skb->len - sizeof(struct ipv6hdr));
+		if (inner_offset<0)
+			return;
+	} else {
+		inner_offset = sizeof(struct ipv6hdr);
+	}
+
+	/* Checkin header including 8 bytes of inner protocol header. */
+	if (!pskb_may_pull(skb, inner_offset+8))
+		return;
+
+	saddr = &skb->nh.ipv6h->saddr;
+	daddr = &skb->nh.ipv6h->daddr;
+
+	/* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
+	   Without this we will not able f.e. to make source routed
+	   pmtu discovery.
+	   Corresponding argument (opt) to notifiers is already added.
+	   --ANK (980726)
+	 */
+
+	hash = nexthdr & (MAX_INET_PROTOS - 1);
+
+	rcu_read_lock();
+	ipprot = rcu_dereference(inet6_protos[hash]);
+	if (ipprot && ipprot->err_handler)
+		ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
+	rcu_read_unlock();
+
+	read_lock(&raw_v6_lock);
+	if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) {
+		while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) {
+			rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
+			sk = sk_next(sk);
+		}
+	}
+	read_unlock(&raw_v6_lock);
+}
+  
+/*
+ *	Handle icmp messages
+ */
+
+static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+	struct sk_buff *skb = *pskb;
+	struct net_device *dev = skb->dev;
+	struct inet6_dev *idev = __in6_dev_get(dev);
+	struct in6_addr *saddr, *daddr;
+	struct ipv6hdr *orig_hdr;
+	struct icmp6hdr *hdr;
+	int type;
+
+	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS);
+
+	saddr = &skb->nh.ipv6h->saddr;
+	daddr = &skb->nh.ipv6h->daddr;
+
+	/* Perform checksum. */
+	if (skb->ip_summed == CHECKSUM_HW) {
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+		if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
+				    skb->csum)) {
+			LIMIT_NETDEBUG(
+				printk(KERN_DEBUG "ICMPv6 hw checksum failed\n"));
+			skb->ip_summed = CHECKSUM_NONE;
+		}
+	}
+	if (skb->ip_summed == CHECKSUM_NONE) {
+		if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
+				    skb_checksum(skb, 0, skb->len, 0))) {
+			LIMIT_NETDEBUG(
+				printk(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
+				       NIP6(*saddr), NIP6(*daddr)));
+			goto discard_it;
+		}
+	}
+
+	if (!pskb_pull(skb, sizeof(struct icmp6hdr)))
+		goto discard_it;
+
+	hdr = (struct icmp6hdr *) skb->h.raw;
+
+	type = hdr->icmp6_type;
+
+	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
+		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
+	else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT)
+		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST);
+
+	switch (type) {
+	case ICMPV6_ECHO_REQUEST:
+		icmpv6_echo_reply(skb);
+		break;
+
+	case ICMPV6_ECHO_REPLY:
+		/* we couldn't care less */
+		break;
+
+	case ICMPV6_PKT_TOOBIG:
+		/* BUGGG_FUTURE: if packet contains rthdr, we cannot update
+		   standard destination cache. Seems, only "advanced"
+		   destination cache will allow to solve this problem
+		   --ANK (980726)
+		 */
+		if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+			goto discard_it;
+		hdr = (struct icmp6hdr *) skb->h.raw;
+		orig_hdr = (struct ipv6hdr *) (hdr + 1);
+		rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
+				   ntohl(hdr->icmp6_mtu));
+
+		/*
+		 *	Drop through to notify
+		 */
+
+	case ICMPV6_DEST_UNREACH:
+	case ICMPV6_TIME_EXCEED:
+	case ICMPV6_PARAMPROB:
+		icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+		break;
+
+	case NDISC_ROUTER_SOLICITATION:
+	case NDISC_ROUTER_ADVERTISEMENT:
+	case NDISC_NEIGHBOUR_SOLICITATION:
+	case NDISC_NEIGHBOUR_ADVERTISEMENT:
+	case NDISC_REDIRECT:
+		ndisc_rcv(skb);
+		break;
+
+	case ICMPV6_MGM_QUERY:
+		igmp6_event_query(skb);
+		break;
+
+	case ICMPV6_MGM_REPORT:
+		igmp6_event_report(skb);
+		break;
+
+	case ICMPV6_MGM_REDUCTION:
+	case ICMPV6_NI_QUERY:
+	case ICMPV6_NI_REPLY:
+	case ICMPV6_MLD2_REPORT:
+	case ICMPV6_DHAAD_REQUEST:
+	case ICMPV6_DHAAD_REPLY:
+	case ICMPV6_MOBILE_PREFIX_SOL:
+	case ICMPV6_MOBILE_PREFIX_ADV:
+		break;
+
+	default:
+		LIMIT_NETDEBUG(
+			printk(KERN_DEBUG "icmpv6: msg of unknown type\n"));
+
+		/* informational */
+		if (type & ICMPV6_INFOMSG_MASK)
+			break;
+
+		/* 
+		 * error of unknown type. 
+		 * must pass to upper level 
+		 */
+
+		icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+	};
+	kfree_skb(skb);
+	return 0;
+
+discard_it:
+	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
+	kfree_skb(skb);
+	return 0;
+}
+
+int __init icmpv6_init(struct net_proto_family *ops)
+{
+	struct sock *sk;
+	int err, i, j;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (!cpu_possible(i))
+			continue;
+
+		err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,
+				       &per_cpu(__icmpv6_socket, i));
+		if (err < 0) {
+			printk(KERN_ERR
+			       "Failed to initialize the ICMP6 control socket "
+			       "(err %d).\n",
+			       err);
+			goto fail;
+		}
+
+		sk = per_cpu(__icmpv6_socket, i)->sk;
+		sk->sk_allocation = GFP_ATOMIC;
+
+		/* Enough space for 2 64K ICMP packets, including
+		 * sk_buff struct overhead.
+		 */
+		sk->sk_sndbuf =
+			(2 * ((64 * 1024) + sizeof(struct sk_buff)));
+
+		sk->sk_prot->unhash(sk);
+	}
+
+
+	if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) {
+		printk(KERN_ERR "Failed to register ICMP6 protocol\n");
+		err = -EAGAIN;
+		goto fail;
+	}
+
+	return 0;
+
+ fail:
+	for (j = 0; j < i; j++) {
+		if (!cpu_possible(j))
+			continue;
+		sock_release(per_cpu(__icmpv6_socket, j));
+	}
+
+	return err;
+}
+
+void icmpv6_cleanup(void)
+{
+	int i;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (!cpu_possible(i))
+			continue;
+		sock_release(per_cpu(__icmpv6_socket, i));
+	}
+	inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+}
+
+static struct icmp6_err {
+	int err;
+	int fatal;
+} tab_unreach[] = {
+	{	/* NOROUTE */
+		.err	= ENETUNREACH,
+		.fatal	= 0,
+	},
+	{	/* ADM_PROHIBITED */
+		.err	= EACCES,
+		.fatal	= 1,
+	},
+	{	/* Was NOT_NEIGHBOUR, now reserved */
+		.err	= EHOSTUNREACH,
+		.fatal	= 0,
+	},
+	{	/* ADDR_UNREACH	*/
+		.err	= EHOSTUNREACH,
+		.fatal	= 0,
+	},
+	{	/* PORT_UNREACH	*/
+		.err	= ECONNREFUSED,
+		.fatal	= 1,
+	},
+};
+
+int icmpv6_err_convert(int type, int code, int *err)
+{
+	int fatal = 0;
+
+	*err = EPROTO;
+
+	switch (type) {
+	case ICMPV6_DEST_UNREACH:
+		fatal = 1;
+		if (code <= ICMPV6_PORT_UNREACH) {
+			*err  = tab_unreach[code].err;
+			fatal = tab_unreach[code].fatal;
+		}
+		break;
+
+	case ICMPV6_PKT_TOOBIG:
+		*err = EMSGSIZE;
+		break;
+		
+	case ICMPV6_PARAMPROB:
+		*err = EPROTO;
+		fatal = 1;
+		break;
+
+	case ICMPV6_TIME_EXCEED:
+		*err = EHOSTUNREACH;
+		break;
+	};
+
+	return fatal;
+}
+
+#ifdef CONFIG_SYSCTL
+ctl_table ipv6_icmp_table[] = {
+	{
+		.ctl_name	= NET_IPV6_ICMP_RATELIMIT,
+		.procname	= "ratelimit",
+		.data		= &sysctl_icmpv6_time,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec
+	},
+	{ .ctl_name = 0 },
+};
+#endif
+