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authorDavid S. Miller <davem@davemloft.net>2013-08-20 20:30:54 (GMT)
committerDavid S. Miller <davem@davemloft.net>2013-08-20 20:30:54 (GMT)
commit89d5e23210f53ab53b7ff64843bce62a106d454f (patch)
tree1be286a315bb017259da19eb1a5e92c5110dbc3b /net
parent15ec80f5d4ad4d62ba3f19c90b3c995690b02103 (diff)
parent38c67328ac79cb9eaf61b5d4750fe3b9cff0dd15 (diff)
downloadlinux-89d5e23210f53ab53b7ff64843bce62a106d454f.tar.xz
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
Conflicts: net/netfilter/nf_conntrack_proto_tcp.c The conflict had to do with overlapping changes dealing with fixing the use of an "s32" to hold the value returned by NAT_OFFSET(). Pablo Neira Ayuso says: ==================== The following batch contains Netfilter/IPVS updates for your net-next tree. More specifically, they are: * Trivial typo fix in xt_addrtype, from Phil Oester. * Remove net_ratelimit in the conntrack logging for consistency with other logging subsystem, from Patrick McHardy. * Remove unneeded includes from the recently added xt_connlabel support, from Florian Westphal. * Allow to update conntracks via nfqueue, don't need NFQA_CFG_F_CONNTRACK for this, from Florian Westphal. * Remove tproxy core, now that we have socket early demux, from Florian Westphal. * A couple of patches to refactor conntrack event reporting to save a good bunch of lines, from Florian Westphal. * Fix missing locking in NAT sequence adjustment, it did not manifested in any known bug so far, from Patrick McHardy. * Change sequence number adjustment variable to 32 bits, to delay the possible early overflow in long standing connections, also from Patrick. * Comestic cleanups for IPVS, from Dragos Foianu. * Fix possible null dereference in IPVS in the SH scheduler, from Daniel Borkmann. * Allow to attach conntrack expectations via nfqueue. Before this patch, you had to use ctnetlink instead, thus, we save the conntrack lookup. * Export xt_rpfilter and xt_HMARK header files, from Nicolas Dichtel. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/ipt_MASQUERADE.c2
-rw-r--r--net/ipv6/netfilter/ip6t_MASQUERADE.c2
-rw-r--r--net/netfilter/Kconfig22
-rw-r--r--net/netfilter/Makefile3
-rw-r--r--net/netfilter/core.c7
-rw-r--r--net/netfilter/ipvs/ip_vs_lblcr.c8
-rw-r--r--net/netfilter/ipvs/ip_vs_sh.c6
-rw-r--r--net/netfilter/nf_conntrack_core.c69
-rw-r--r--net/netfilter/nf_conntrack_labels.c4
-rw-r--r--net/netfilter/nf_conntrack_netlink.c269
-rw-r--r--net/netfilter/nf_conntrack_proto.c4
-rw-r--r--net/netfilter/nf_conntrack_proto_tcp.c4
-rw-r--r--net/netfilter/nf_nat_core.c6
-rw-r--r--net/netfilter/nf_nat_helper.c28
-rw-r--r--net/netfilter/nf_tproxy_core.c62
-rw-r--r--net/netfilter/nfnetlink_queue_core.c11
-rw-r--r--net/netfilter/nfnetlink_queue_ct.c15
-rw-r--r--net/netfilter/xt_TPROXY.c169
-rw-r--r--net/netfilter/xt_addrtype.c2
-rw-r--r--net/netfilter/xt_socket.c66
20 files changed, 486 insertions, 273 deletions
diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c
index 30e4de9..00352ce 100644
--- a/net/ipv4/netfilter/ipt_MASQUERADE.c
+++ b/net/ipv4/netfilter/ipt_MASQUERADE.c
@@ -118,7 +118,7 @@ static int masq_device_event(struct notifier_block *this,
NF_CT_ASSERT(dev->ifindex != 0);
nf_ct_iterate_cleanup(net, device_cmp,
- (void *)(long)dev->ifindex);
+ (void *)(long)dev->ifindex, 0, 0);
}
return NOTIFY_DONE;
diff --git a/net/ipv6/netfilter/ip6t_MASQUERADE.c b/net/ipv6/netfilter/ip6t_MASQUERADE.c
index 47bff61..3e4e92d 100644
--- a/net/ipv6/netfilter/ip6t_MASQUERADE.c
+++ b/net/ipv6/netfilter/ip6t_MASQUERADE.c
@@ -76,7 +76,7 @@ static int masq_device_event(struct notifier_block *this,
if (event == NETDEV_DOWN)
nf_ct_iterate_cleanup(net, device_cmp,
- (void *)(long)dev->ifindex);
+ (void *)(long)dev->ifindex, 0, 0);
return NOTIFY_DONE;
}
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 56d22ca..c45fc1a 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -410,20 +410,6 @@ config NF_NAT_TFTP
endif # NF_CONNTRACK
-# transparent proxy support
-config NETFILTER_TPROXY
- tristate "Transparent proxying support"
- depends on IP_NF_MANGLE
- depends on NETFILTER_ADVANCED
- help
- This option enables transparent proxying support, that is,
- support for handling non-locally bound IPv4 TCP and UDP sockets.
- For it to work you will have to configure certain iptables rules
- and use policy routing. For more information on how to set it up
- see Documentation/networking/tproxy.txt.
-
- To compile it as a module, choose M here. If unsure, say N.
-
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
@@ -720,10 +706,10 @@ config NETFILTER_XT_TARGET_TEE
this clone be rerouted to another nexthop.
config NETFILTER_XT_TARGET_TPROXY
- tristate '"TPROXY" target support'
- depends on NETFILTER_TPROXY
+ tristate '"TPROXY" target transparent proxying support'
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
+ depends on IP_NF_MANGLE
select NF_DEFRAG_IPV4
select NF_DEFRAG_IPV6 if IP6_NF_IPTABLES
help
@@ -731,6 +717,9 @@ config NETFILTER_XT_TARGET_TPROXY
REDIRECT. It can only be used in the mangle table and is useful
to redirect traffic to a transparent proxy. It does _not_ depend
on Netfilter connection tracking and NAT, unlike REDIRECT.
+ For it to work you will have to configure certain iptables rules
+ and use policy routing. For more information on how to set it up
+ see Documentation/networking/tproxy.txt.
To compile it as a module, choose M here. If unsure, say N.
@@ -1180,7 +1169,6 @@ config NETFILTER_XT_MATCH_SCTP
config NETFILTER_XT_MATCH_SOCKET
tristate '"socket" match support'
- depends on NETFILTER_TPROXY
depends on NETFILTER_XTABLES
depends on NETFILTER_ADVANCED
depends on !NF_CONNTRACK || NF_CONNTRACK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index a1abf87..ebfa7dc 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -61,9 +61,6 @@ obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
-# transparent proxy support
-obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
-
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 2217363..593b16e 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -234,12 +234,13 @@ EXPORT_SYMBOL(skb_make_writable);
/* This does not belong here, but locally generated errors need it if connection
tracking in use: without this, connection may not be in hash table, and hence
manufactured ICMP or RST packets will not be associated with it. */
-void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *) __rcu __read_mostly;
+void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *)
+ __rcu __read_mostly;
EXPORT_SYMBOL(ip_ct_attach);
-void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb)
+void nf_ct_attach(struct sk_buff *new, const struct sk_buff *skb)
{
- void (*attach)(struct sk_buff *, struct sk_buff *);
+ void (*attach)(struct sk_buff *, const struct sk_buff *);
if (skb->nfct) {
rcu_read_lock();
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index 3cd85b2..5199448 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -414,7 +414,7 @@ static void ip_vs_lblcr_flush(struct ip_vs_service *svc)
spin_lock_bh(&svc->sched_lock);
tbl->dead = 1;
- for (i=0; i<IP_VS_LBLCR_TAB_SIZE; i++) {
+ for (i = 0; i < IP_VS_LBLCR_TAB_SIZE; i++) {
hlist_for_each_entry_safe(en, next, &tbl->bucket[i], list) {
ip_vs_lblcr_free(en);
}
@@ -440,7 +440,7 @@ static inline void ip_vs_lblcr_full_check(struct ip_vs_service *svc)
struct ip_vs_lblcr_entry *en;
struct hlist_node *next;
- for (i=0, j=tbl->rover; i<IP_VS_LBLCR_TAB_SIZE; i++) {
+ for (i = 0, j = tbl->rover; i < IP_VS_LBLCR_TAB_SIZE; i++) {
j = (j + 1) & IP_VS_LBLCR_TAB_MASK;
spin_lock(&svc->sched_lock);
@@ -495,7 +495,7 @@ static void ip_vs_lblcr_check_expire(unsigned long data)
if (goal > tbl->max_size/2)
goal = tbl->max_size/2;
- for (i=0, j=tbl->rover; i<IP_VS_LBLCR_TAB_SIZE; i++) {
+ for (i = 0, j = tbl->rover; i < IP_VS_LBLCR_TAB_SIZE; i++) {
j = (j + 1) & IP_VS_LBLCR_TAB_MASK;
spin_lock(&svc->sched_lock);
@@ -536,7 +536,7 @@ static int ip_vs_lblcr_init_svc(struct ip_vs_service *svc)
/*
* Initialize the hash buckets
*/
- for (i=0; i<IP_VS_LBLCR_TAB_SIZE; i++) {
+ for (i = 0; i < IP_VS_LBLCR_TAB_SIZE; i++) {
INIT_HLIST_HEAD(&tbl->bucket[i]);
}
tbl->max_size = IP_VS_LBLCR_TAB_SIZE*16;
diff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
index f16c027..3588fae 100644
--- a/net/netfilter/ipvs/ip_vs_sh.c
+++ b/net/netfilter/ipvs/ip_vs_sh.c
@@ -269,14 +269,20 @@ ip_vs_sh_get_port(const struct sk_buff *skb, struct ip_vs_iphdr *iph)
switch (iph->protocol) {
case IPPROTO_TCP:
th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
+ if (unlikely(th == NULL))
+ return 0;
port = th->source;
break;
case IPPROTO_UDP:
uh = skb_header_pointer(skb, iph->len, sizeof(_udph), &_udph);
+ if (unlikely(uh == NULL))
+ return 0;
port = uh->source;
break;
case IPPROTO_SCTP:
sh = skb_header_pointer(skb, iph->len, sizeof(_sctph), &_sctph);
+ if (unlikely(sh == NULL))
+ return 0;
port = sh->source;
break;
default:
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 0283bae..da6f178 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -238,7 +238,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
nf_conntrack_free(ct);
}
-void nf_ct_delete_from_lists(struct nf_conn *ct)
+static void nf_ct_delete_from_lists(struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
@@ -253,7 +253,6 @@ void nf_ct_delete_from_lists(struct nf_conn *ct)
&net->ct.dying);
spin_unlock_bh(&nf_conntrack_lock);
}
-EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists);
static void death_by_event(unsigned long ul_conntrack)
{
@@ -275,7 +274,7 @@ static void death_by_event(unsigned long ul_conntrack)
nf_ct_put(ct);
}
-void nf_ct_dying_timeout(struct nf_conn *ct)
+static void nf_ct_dying_timeout(struct nf_conn *ct)
{
struct net *net = nf_ct_net(ct);
struct nf_conntrack_ecache *ecache = nf_ct_ecache_find(ct);
@@ -288,27 +287,33 @@ void nf_ct_dying_timeout(struct nf_conn *ct)
(prandom_u32() % net->ct.sysctl_events_retry_timeout);
add_timer(&ecache->timeout);
}
-EXPORT_SYMBOL_GPL(nf_ct_dying_timeout);
-static void death_by_timeout(unsigned long ul_conntrack)
+bool nf_ct_delete(struct nf_conn *ct, u32 portid, int report)
{
- struct nf_conn *ct = (void *)ul_conntrack;
struct nf_conn_tstamp *tstamp;
tstamp = nf_conn_tstamp_find(ct);
if (tstamp && tstamp->stop == 0)
tstamp->stop = ktime_to_ns(ktime_get_real());
- if (!test_bit(IPS_DYING_BIT, &ct->status) &&
- unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) {
+ if (!nf_ct_is_dying(ct) &&
+ unlikely(nf_conntrack_event_report(IPCT_DESTROY, ct,
+ portid, report) < 0)) {
/* destroy event was not delivered */
nf_ct_delete_from_lists(ct);
nf_ct_dying_timeout(ct);
- return;
+ return false;
}
set_bit(IPS_DYING_BIT, &ct->status);
nf_ct_delete_from_lists(ct);
nf_ct_put(ct);
+ return true;
+}
+EXPORT_SYMBOL_GPL(nf_ct_delete);
+
+static void death_by_timeout(unsigned long ul_conntrack)
+{
+ nf_ct_delete((struct nf_conn *)ul_conntrack, 0, 0);
}
/*
@@ -643,10 +648,7 @@ static noinline int early_drop(struct net *net, unsigned int hash)
return dropped;
if (del_timer(&ct->timeout)) {
- death_by_timeout((unsigned long)ct);
- /* Check if we indeed killed this entry. Reliable event
- delivery may have inserted it into the dying list. */
- if (test_bit(IPS_DYING_BIT, &ct->status)) {
+ if (nf_ct_delete(ct, 0, 0)) {
dropped = 1;
NF_CT_STAT_INC_ATOMIC(net, early_drop);
}
@@ -1192,7 +1194,7 @@ EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size);
#endif
/* Used by ipt_REJECT and ip6t_REJECT. */
-static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb)
+static void nf_conntrack_attach(struct sk_buff *nskb, const struct sk_buff *skb)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
@@ -1244,7 +1246,7 @@ found:
void nf_ct_iterate_cleanup(struct net *net,
int (*iter)(struct nf_conn *i, void *data),
- void *data)
+ void *data, u32 portid, int report)
{
struct nf_conn *ct;
unsigned int bucket = 0;
@@ -1252,7 +1254,8 @@ void nf_ct_iterate_cleanup(struct net *net,
while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) {
/* Time to push up daises... */
if (del_timer(&ct->timeout))
- death_by_timeout((unsigned long)ct);
+ nf_ct_delete(ct, portid, report);
+
/* ... else the timer will get him soon. */
nf_ct_put(ct);
@@ -1260,30 +1263,6 @@ void nf_ct_iterate_cleanup(struct net *net,
}
EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup);
-struct __nf_ct_flush_report {
- u32 portid;
- int report;
-};
-
-static int kill_report(struct nf_conn *i, void *data)
-{
- struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data;
- struct nf_conn_tstamp *tstamp;
-
- tstamp = nf_conn_tstamp_find(i);
- if (tstamp && tstamp->stop == 0)
- tstamp->stop = ktime_to_ns(ktime_get_real());
-
- /* If we fail to deliver the event, death_by_timeout() will retry */
- if (nf_conntrack_event_report(IPCT_DESTROY, i,
- fr->portid, fr->report) < 0)
- return 1;
-
- /* Avoid the delivery of the destroy event in death_by_timeout(). */
- set_bit(IPS_DYING_BIT, &i->status);
- return 1;
-}
-
static int kill_all(struct nf_conn *i, void *data)
{
return 1;
@@ -1301,11 +1280,7 @@ EXPORT_SYMBOL_GPL(nf_ct_free_hashtable);
void nf_conntrack_flush_report(struct net *net, u32 portid, int report)
{
- struct __nf_ct_flush_report fr = {
- .portid = portid,
- .report = report,
- };
- nf_ct_iterate_cleanup(net, kill_report, &fr);
+ nf_ct_iterate_cleanup(net, kill_all, NULL, portid, report);
}
EXPORT_SYMBOL_GPL(nf_conntrack_flush_report);
@@ -1386,7 +1361,7 @@ void nf_conntrack_cleanup_net_list(struct list_head *net_exit_list)
i_see_dead_people:
busy = 0;
list_for_each_entry(net, net_exit_list, exit_list) {
- nf_ct_iterate_cleanup(net, kill_all, NULL);
+ nf_ct_iterate_cleanup(net, kill_all, NULL, 0, 0);
nf_ct_release_dying_list(net);
if (atomic_read(&net->ct.count) != 0)
busy = 1;
@@ -1692,7 +1667,7 @@ err_stat:
return ret;
}
-s16 (*nf_ct_nat_offset)(const struct nf_conn *ct,
+s32 (*nf_ct_nat_offset)(const struct nf_conn *ct,
enum ip_conntrack_dir dir,
u32 seq);
EXPORT_SYMBOL_GPL(nf_ct_nat_offset);
diff --git a/net/netfilter/nf_conntrack_labels.c b/net/netfilter/nf_conntrack_labels.c
index 355d2ef..bb53f12 100644
--- a/net/netfilter/nf_conntrack_labels.c
+++ b/net/netfilter/nf_conntrack_labels.c
@@ -8,12 +8,8 @@
* published by the Free Software Foundation.
*/
-#include <linux/ctype.h>
#include <linux/export.h>
-#include <linux/jhash.h>
-#include <linux/spinlock.h>
#include <linux/types.h>
-#include <linux/slab.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index edc410e..fa61fea 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1038,21 +1038,9 @@ ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
}
}
- if (del_timer(&ct->timeout)) {
- if (nf_conntrack_event_report(IPCT_DESTROY, ct,
- NETLINK_CB(skb).portid,
- nlmsg_report(nlh)) < 0) {
- nf_ct_delete_from_lists(ct);
- /* we failed to report the event, try later */
- nf_ct_dying_timeout(ct);
- nf_ct_put(ct);
- return 0;
- }
- /* death_by_timeout would report the event again */
- set_bit(IPS_DYING_BIT, &ct->status);
- nf_ct_delete_from_lists(ct);
- nf_ct_put(ct);
- }
+ if (del_timer(&ct->timeout))
+ nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
+
nf_ct_put(ct);
return 0;
@@ -1999,6 +1987,27 @@ out:
return err == -EAGAIN ? -ENOBUFS : err;
}
+static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
+ [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
+ [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
+ [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
+ [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
+ [CTA_EXPECT_ID] = { .type = NLA_U32 },
+ [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
+ .len = NF_CT_HELPER_NAME_LEN - 1 },
+ [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
+ [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
+ [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
+ [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
+ [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
+};
+
+static struct nf_conntrack_expect *
+ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
+ struct nf_conntrack_helper *helper,
+ struct nf_conntrack_tuple *tuple,
+ struct nf_conntrack_tuple *mask);
+
#ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
static size_t
ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
@@ -2139,10 +2148,69 @@ ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
return ret;
}
+static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
+ const struct nf_conn *ct,
+ struct nf_conntrack_tuple *tuple,
+ struct nf_conntrack_tuple *mask)
+{
+ int err;
+
+ err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
+ nf_ct_l3num(ct));
+ if (err < 0)
+ return err;
+
+ return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
+ nf_ct_l3num(ct));
+}
+
+static int
+ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
+ u32 portid, u32 report)
+{
+ struct nlattr *cda[CTA_EXPECT_MAX+1];
+ struct nf_conntrack_tuple tuple, mask;
+ struct nf_conntrack_helper *helper;
+ struct nf_conntrack_expect *exp;
+ int err;
+
+ err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
+ if (err < 0)
+ return err;
+
+ err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
+ ct, &tuple, &mask);
+ if (err < 0)
+ return err;
+
+ if (cda[CTA_EXPECT_HELP_NAME]) {
+ const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
+
+ helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
+ nf_ct_protonum(ct));
+ if (helper == NULL)
+ return -EOPNOTSUPP;
+ }
+
+ exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
+ helper, &tuple, &mask);
+ if (IS_ERR(exp))
+ return PTR_ERR(exp);
+
+ err = nf_ct_expect_related_report(exp, portid, report);
+ if (err < 0) {
+ nf_ct_expect_put(exp);
+ return err;
+ }
+
+ return 0;
+}
+
static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
.build_size = ctnetlink_nfqueue_build_size,
.build = ctnetlink_nfqueue_build,
.parse = ctnetlink_nfqueue_parse,
+ .attach_expect = ctnetlink_nfqueue_attach_expect,
};
#endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
@@ -2510,21 +2578,6 @@ static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
return err;
}
-static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
- [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
- [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
- [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
- [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
- [CTA_EXPECT_ID] = { .type = NLA_U32 },
- [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
- .len = NF_CT_HELPER_NAME_LEN - 1 },
- [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
- [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
- [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
- [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
- [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
-};
-
static int
ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
const struct nlmsghdr *nlh,
@@ -2747,76 +2800,26 @@ ctnetlink_parse_expect_nat(const struct nlattr *attr,
#endif
}
-static int
-ctnetlink_create_expect(struct net *net, u16 zone,
- const struct nlattr * const cda[],
- u_int8_t u3,
- u32 portid, int report)
+static struct nf_conntrack_expect *
+ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
+ struct nf_conntrack_helper *helper,
+ struct nf_conntrack_tuple *tuple,
+ struct nf_conntrack_tuple *mask)
{
- struct nf_conntrack_tuple tuple, mask, master_tuple;
- struct nf_conntrack_tuple_hash *h = NULL;
+ u_int32_t class = 0;
struct nf_conntrack_expect *exp;
- struct nf_conn *ct;
struct nf_conn_help *help;
- struct nf_conntrack_helper *helper = NULL;
- u_int32_t class = 0;
- int err = 0;
-
- /* caller guarantees that those three CTA_EXPECT_* exist */
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
- if (err < 0)
- return err;
-
- /* Look for master conntrack of this expectation */
- h = nf_conntrack_find_get(net, zone, &master_tuple);
- if (!h)
- return -ENOENT;
- ct = nf_ct_tuplehash_to_ctrack(h);
-
- /* Look for helper of this expectation */
- if (cda[CTA_EXPECT_HELP_NAME]) {
- const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
-
- helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper == NULL) {
-#ifdef CONFIG_MODULES
- if (request_module("nfct-helper-%s", helpname) < 0) {
- err = -EOPNOTSUPP;
- goto out;
- }
-
- helper = __nf_conntrack_helper_find(helpname,
- nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper) {
- err = -EAGAIN;
- goto out;
- }
-#endif
- err = -EOPNOTSUPP;
- goto out;
- }
- }
+ int err;
if (cda[CTA_EXPECT_CLASS] && helper) {
class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
- if (class > helper->expect_class_max) {
- err = -EINVAL;
- goto out;
- }
+ if (class > helper->expect_class_max)
+ return ERR_PTR(-EINVAL);
}
exp = nf_ct_expect_alloc(ct);
- if (!exp) {
- err = -ENOMEM;
- goto out;
- }
+ if (!exp)
+ return ERR_PTR(-ENOMEM);
+
help = nfct_help(ct);
if (!help) {
if (!cda[CTA_EXPECT_TIMEOUT]) {
@@ -2854,21 +2857,89 @@ ctnetlink_create_expect(struct net *net, u16 zone,
exp->class = class;
exp->master = ct;
exp->helper = helper;
- memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
- memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
- exp->mask.src.u.all = mask.src.u.all;
+ exp->tuple = *tuple;
+ exp->mask.src.u3 = mask->src.u3;
+ exp->mask.src.u.all = mask->src.u.all;
if (cda[CTA_EXPECT_NAT]) {
err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
- exp, u3);
+ exp, nf_ct_l3num(ct));
if (err < 0)
goto err_out;
}
- err = nf_ct_expect_related_report(exp, portid, report);
+ return exp;
err_out:
nf_ct_expect_put(exp);
-out:
- nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
+ return ERR_PTR(err);
+}
+
+static int
+ctnetlink_create_expect(struct net *net, u16 zone,
+ const struct nlattr * const cda[],
+ u_int8_t u3, u32 portid, int report)
+{
+ struct nf_conntrack_tuple tuple, mask, master_tuple;
+ struct nf_conntrack_tuple_hash *h = NULL;
+ struct nf_conntrack_helper *helper = NULL;
+ struct nf_conntrack_expect *exp;
+ struct nf_conn *ct;
+ int err;
+
+ /* caller guarantees that those three CTA_EXPECT_* exist */
+ err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
+ if (err < 0)
+ return err;
+ err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
+ if (err < 0)
+ return err;
+ err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
+ if (err < 0)
+ return err;
+
+ /* Look for master conntrack of this expectation */
+ h = nf_conntrack_find_get(net, zone, &master_tuple);
+ if (!h)
+ return -ENOENT;
+ ct = nf_ct_tuplehash_to_ctrack(h);
+
+ if (cda[CTA_EXPECT_HELP_NAME]) {
+ const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
+
+ helper = __nf_conntrack_helper_find(helpname, u3,
+ nf_ct_protonum(ct));
+ if (helper == NULL) {
+#ifdef CONFIG_MODULES
+ if (request_module("nfct-helper-%s", helpname) < 0) {
+ err = -EOPNOTSUPP;
+ goto err_ct;
+ }
+ helper = __nf_conntrack_helper_find(helpname, u3,
+ nf_ct_protonum(ct));
+ if (helper) {
+ err = -EAGAIN;
+ goto err_ct;
+ }
+#endif
+ err = -EOPNOTSUPP;
+ goto err_ct;
+ }
+ }
+
+ exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
+ if (IS_ERR(exp)) {
+ err = PTR_ERR(exp);
+ goto err_ct;
+ }
+
+ err = nf_ct_expect_related_report(exp, portid, report);
+ if (err < 0)
+ goto err_exp;
+
+ return 0;
+err_exp:
+ nf_ct_expect_put(exp);
+err_ct:
+ nf_ct_put(ct);
return err;
}
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 0ab9636..ce30041 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -281,7 +281,7 @@ void nf_ct_l3proto_pernet_unregister(struct net *net,
nf_ct_l3proto_unregister_sysctl(net, proto);
/* Remove all contrack entries for this protocol */
- nf_ct_iterate_cleanup(net, kill_l3proto, proto);
+ nf_ct_iterate_cleanup(net, kill_l3proto, proto, 0, 0);
}
EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister);
@@ -476,7 +476,7 @@ void nf_ct_l4proto_pernet_unregister(struct net *net,
nf_ct_l4proto_unregister_sysctl(net, pn, l4proto);
/* Remove all contrack entries for this protocol */
- nf_ct_iterate_cleanup(net, kill_l4proto, l4proto);
+ nf_ct_iterate_cleanup(net, kill_l4proto, l4proto, 0, 0);
}
EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister);
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 2f80107..d224e00 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -496,7 +496,7 @@ static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff,
}
#ifdef CONFIG_NF_NAT_NEEDED
-static inline s16 nat_offset(const struct nf_conn *ct,
+static inline s32 nat_offset(const struct nf_conn *ct,
enum ip_conntrack_dir dir,
u32 seq)
{
@@ -525,7 +525,7 @@ static bool tcp_in_window(const struct nf_conn *ct,
struct ip_ct_tcp_state *receiver = &state->seen[!dir];
const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
__u32 seq, ack, sack, end, win, swin;
- s16 receiver_offset;
+ s32 receiver_offset;
bool res, in_recv_win;
/*
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 038eee5..6ff8083 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -497,7 +497,7 @@ static void nf_nat_l4proto_clean(u8 l3proto, u8 l4proto)
rtnl_lock();
for_each_net(net)
- nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean);
+ nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean, 0, 0);
rtnl_unlock();
}
@@ -511,7 +511,7 @@ static void nf_nat_l3proto_clean(u8 l3proto)
rtnl_lock();
for_each_net(net)
- nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean);
+ nf_ct_iterate_cleanup(net, nf_nat_proto_remove, &clean, 0, 0);
rtnl_unlock();
}
@@ -749,7 +749,7 @@ static void __net_exit nf_nat_net_exit(struct net *net)
{
struct nf_nat_proto_clean clean = {};
- nf_ct_iterate_cleanup(net, &nf_nat_proto_remove, &clean);
+ nf_ct_iterate_cleanup(net, &nf_nat_proto_remove, &clean, 0, 0);
synchronize_rcu();
nf_ct_free_hashtable(net->ct.nat_bysource, net->ct.nat_htable_size);
}
diff --git a/net/netfilter/nf_nat_helper.c b/net/netfilter/nf_nat_helper.c
index 85e20a9..46b9baa 100644
--- a/net/netfilter/nf_nat_helper.c
+++ b/net/netfilter/nf_nat_helper.c
@@ -30,8 +30,6 @@
pr_debug("offset_before=%d, offset_after=%d, correction_pos=%u\n", \
x->offset_before, x->offset_after, x->correction_pos);
-static DEFINE_SPINLOCK(nf_nat_seqofs_lock);
-
/* Setup TCP sequence correction given this change at this sequence */
static inline void
adjust_tcp_sequence(u32 seq,
@@ -49,7 +47,7 @@ adjust_tcp_sequence(u32 seq,
pr_debug("adjust_tcp_sequence: Seq_offset before: ");
DUMP_OFFSET(this_way);
- spin_lock_bh(&nf_nat_seqofs_lock);
+ spin_lock_bh(&ct->lock);
/* SYN adjust. If it's uninitialized, or this is after last
* correction, record it: we don't handle more than one
@@ -61,31 +59,26 @@ adjust_tcp_sequence(u32 seq,
this_way->offset_before = this_way->offset_after;
this_way->offset_after += sizediff;
}
- spin_unlock_bh(&nf_nat_seqofs_lock);
+ spin_unlock_bh(&ct->lock);
pr_debug("adjust_tcp_sequence: Seq_offset after: ");
DUMP_OFFSET(this_way);
}
-/* Get the offset value, for conntrack */
-s16 nf_nat_get_offset(const struct nf_conn *ct,
+/* Get the offset value, for conntrack. Caller must have the conntrack locked */
+s32 nf_nat_get_offset(const struct nf_conn *ct,
enum ip_conntrack_dir dir,
u32 seq)
{
struct nf_conn_nat *nat = nfct_nat(ct);
struct nf_nat_seq *this_way;
- s16 offset;
if (!nat)
return 0;
this_way = &nat->seq[dir];
- spin_lock_bh(&nf_nat_seqofs_lock);
- offset = after(seq, this_way->correction_pos)
+ return after(seq, this_way->correction_pos)
? this_way->offset_after : this_way->offset_before;
- spin_unlock_bh(&nf_nat_seqofs_lock);
-
- return offset;
}
/* Frobs data inside this packet, which is linear. */
@@ -143,7 +136,7 @@ static int enlarge_skb(struct sk_buff *skb, unsigned int extra)
}
void nf_nat_set_seq_adjust(struct nf_conn *ct, enum ip_conntrack_info ctinfo,
- __be32 seq, s16 off)
+ __be32 seq, s32 off)
{
if (!off)
return;
@@ -370,9 +363,10 @@ nf_nat_seq_adjust(struct sk_buff *skb,
struct tcphdr *tcph;
int dir;
__be32 newseq, newack;
- s16 seqoff, ackoff;
+ s32 seqoff, ackoff;
struct nf_conn_nat *nat = nfct_nat(ct);
struct nf_nat_seq *this_way, *other_way;
+ int res;
dir = CTINFO2DIR(ctinfo);
@@ -383,6 +377,7 @@ nf_nat_seq_adjust(struct sk_buff *skb,
return 0;
tcph = (void *)skb->data + protoff;
+ spin_lock_bh(&ct->lock);
if (after(ntohl(tcph->seq), this_way->correction_pos))
seqoff = this_way->offset_after;
else
@@ -407,7 +402,10 @@ nf_nat_seq_adjust(struct sk_buff *skb,
tcph->seq = newseq;
tcph->ack_seq = newack;
- return nf_nat_sack_adjust(skb, protoff, tcph, ct, ctinfo);
+ res = nf_nat_sack_adjust(skb, protoff, tcph, ct, ctinfo);
+ spin_unlock_bh(&ct->lock);
+
+ return res;
}
/* Setup NAT on this expected conntrack so it follows master. */
diff --git a/net/netfilter/nf_tproxy_core.c b/net/netfilter/nf_tproxy_core.c
deleted file mode 100644
index 474d621..0000000
--- a/net/netfilter/nf_tproxy_core.c
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Transparent proxy support for Linux/iptables
- *
- * Copyright (c) 2006-2007 BalaBit IT Ltd.
- * Author: Balazs Scheidler, Krisztian Kovacs
- *
- * 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
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/module.h>
-
-#include <linux/net.h>
-#include <linux/if.h>
-#include <linux/netdevice.h>
-#include <net/udp.h>
-#include <net/netfilter/nf_tproxy_core.h>
-
-
-static void
-nf_tproxy_destructor(struct sk_buff *skb)
-{
- struct sock *sk = skb->sk;
-
- skb->sk = NULL;
- skb->destructor = NULL;
-
- if (sk)
- sock_put(sk);
-}
-
-/* consumes sk */
-void
-nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
-{
- /* assigning tw sockets complicates things; most
- * skb->sk->X checks would have to test sk->sk_state first */
- if (sk->sk_state == TCP_TIME_WAIT) {
- inet_twsk_put(inet_twsk(sk));
- return;
- }
-
- skb_orphan(skb);
- skb->sk = sk;
- skb->destructor = nf_tproxy_destructor;
-}
-EXPORT_SYMBOL_GPL(nf_tproxy_assign_sock);
-
-static int __init nf_tproxy_init(void)
-{
- pr_info("NF_TPROXY: Transparent proxy support initialized, version 4.1.0\n");
- pr_info("NF_TPROXY: Copyright (c) 2006-2007 BalaBit IT Ltd.\n");
- return 0;
-}
-
-module_init(nf_tproxy_init);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Krisztian Kovacs");
-MODULE_DESCRIPTION("Transparent proxy support core routines");
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 8a703c3..95a98c8 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -862,6 +862,7 @@ static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = {
[NFQA_MARK] = { .type = NLA_U32 },
[NFQA_PAYLOAD] = { .type = NLA_UNSPEC },
[NFQA_CT] = { .type = NLA_UNSPEC },
+ [NFQA_EXP] = { .type = NLA_UNSPEC },
};
static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = {
@@ -990,9 +991,14 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
if (entry == NULL)
return -ENOENT;
- rcu_read_lock();
- if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK))
+ if (nfqa[NFQA_CT]) {
ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo);
+ if (ct && nfqa[NFQA_EXP]) {
+ nfqnl_attach_expect(ct, nfqa[NFQA_EXP],
+ NETLINK_CB(skb).portid,
+ nlmsg_report(nlh));
+ }
+ }
if (nfqa[NFQA_PAYLOAD]) {
u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]);
@@ -1005,7 +1011,6 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb,
if (ct)
nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff);
}
- rcu_read_unlock();
if (nfqa[NFQA_MARK])
entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));
diff --git a/net/netfilter/nfnetlink_queue_ct.c b/net/netfilter/nfnetlink_queue_ct.c
index ab61d66..be89303 100644
--- a/net/netfilter/nfnetlink_queue_ct.c
+++ b/net/netfilter/nfnetlink_queue_ct.c
@@ -96,3 +96,18 @@ void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
if ((ct->status & IPS_NAT_MASK) && diff)
nfq_nat_ct->seq_adjust(skb, ct, ctinfo, diff);
}
+
+int nfqnl_attach_expect(struct nf_conn *ct, const struct nlattr *attr,
+ u32 portid, u32 report)
+{
+ struct nfq_ct_hook *nfq_ct;
+
+ if (nf_ct_is_untracked(ct))
+ return 0;
+
+ nfq_ct = rcu_dereference(nfq_ct_hook);
+ if (nfq_ct == NULL)
+ return -EOPNOTSUPP;
+
+ return nfq_ct->attach_expect(attr, ct, portid, report);
+}
diff --git a/net/netfilter/xt_TPROXY.c b/net/netfilter/xt_TPROXY.c
index d7f1953..5d8a3a3 100644
--- a/net/netfilter/xt_TPROXY.c
+++ b/net/netfilter/xt_TPROXY.c
@@ -15,7 +15,9 @@
#include <linux/ip.h>
#include <net/checksum.h>
#include <net/udp.h>
+#include <net/tcp.h>
#include <net/inet_sock.h>
+#include <net/inet_hashtables.h>
#include <linux/inetdevice.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
@@ -26,13 +28,18 @@
#define XT_TPROXY_HAVE_IPV6 1
#include <net/if_inet6.h>
#include <net/addrconf.h>
+#include <net/inet6_hashtables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#endif
-#include <net/netfilter/nf_tproxy_core.h>
#include <linux/netfilter/xt_TPROXY.h>
+enum nf_tproxy_lookup_t {
+ NFT_LOOKUP_LISTENER,
+ NFT_LOOKUP_ESTABLISHED,
+};
+
static bool tproxy_sk_is_transparent(struct sock *sk)
{
if (sk->sk_state != TCP_TIME_WAIT) {
@@ -68,6 +75,157 @@ tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr)
return laddr ? laddr : daddr;
}
+/*
+ * This is used when the user wants to intercept a connection matching
+ * an explicit iptables rule. In this case the sockets are assumed
+ * matching in preference order:
+ *
+ * - match: if there's a fully established connection matching the
+ * _packet_ tuple, it is returned, assuming the redirection
+ * already took place and we process a packet belonging to an
+ * established connection
+ *
+ * - match: if there's a listening socket matching the redirection
+ * (e.g. on-port & on-ip of the connection), it is returned,
+ * regardless if it was bound to 0.0.0.0 or an explicit
+ * address. The reasoning is that if there's an explicit rule, it
+ * does not really matter if the listener is bound to an interface
+ * or to 0. The user already stated that he wants redirection
+ * (since he added the rule).
+ *
+ * Please note that there's an overlap between what a TPROXY target
+ * and a socket match will match. Normally if you have both rules the
+ * "socket" match will be the first one, effectively all packets
+ * belonging to established connections going through that one.
+ */
+static inline struct sock *
+nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
+ const __be32 saddr, const __be32 daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in,
+ const enum nf_tproxy_lookup_t lookup_type)
+{
+ struct sock *sk;
+
+ switch (protocol) {
+ case IPPROTO_TCP:
+ switch (lookup_type) {
+ case NFT_LOOKUP_LISTENER:
+ sk = inet_lookup_listener(net, &tcp_hashinfo,
+ saddr, sport,
+ daddr, dport,
+ in->ifindex);
+
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ break;
+ case NFT_LOOKUP_ESTABLISHED:
+ sk = inet_lookup_established(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ break;
+ default:
+ BUG();
+ }
+ break;
+ case IPPROTO_UDP:
+ sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ if (sk) {
+ int connected = (sk->sk_state == TCP_ESTABLISHED);
+ int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0);
+
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
+ (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
+ sock_put(sk);
+ sk = NULL;
+ }
+ }
+ break;
+ default:
+ WARN_ON(1);
+ sk = NULL;
+ }
+
+ pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
+ protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
+
+ return sk;
+}
+
+#ifdef XT_TPROXY_HAVE_IPV6
+static inline struct sock *
+nf_tproxy_get_sock_v6(struct net *net, const u8 protocol,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in,
+ const enum nf_tproxy_lookup_t lookup_type)
+{
+ struct sock *sk;
+
+ switch (protocol) {
+ case IPPROTO_TCP:
+ switch (lookup_type) {
+ case NFT_LOOKUP_LISTENER:
+ sk = inet6_lookup_listener(net, &tcp_hashinfo,
+ saddr, sport,
+ daddr, ntohs(dport),
+ in->ifindex);
+
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ break;
+ case NFT_LOOKUP_ESTABLISHED:
+ sk = __inet6_lookup_established(net, &tcp_hashinfo,
+ saddr, sport, daddr, ntohs(dport),
+ in->ifindex);
+ break;
+ default:
+ BUG();
+ }
+ break;
+ case IPPROTO_UDP:
+ sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ if (sk) {
+ int connected = (sk->sk_state == TCP_ESTABLISHED);
+ int wildcard = ipv6_addr_any(&inet6_sk(sk)->rcv_saddr);
+
+ /* NOTE: we return listeners even if bound to
+ * 0.0.0.0, those are filtered out in
+ * xt_socket, since xt_TPROXY needs 0 bound
+ * listeners too
+ */
+ if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
+ (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
+ sock_put(sk);
+ sk = NULL;
+ }
+ }
+ break;
+ default:
+ WARN_ON(1);
+ sk = NULL;
+ }
+
+ pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
+ protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
+
+ return sk;
+}
+#endif
+
/**
* tproxy_handle_time_wait4 - handle IPv4 TCP TIME_WAIT reopen redirections
* @skb: The skb being processed.
@@ -117,6 +275,15 @@ tproxy_handle_time_wait4(struct sk_buff *skb, __be32 laddr, __be16 lport,
return sk;
}
+/* assign a socket to the skb -- consumes sk */
+static void
+nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
+{
+ skb_orphan(skb);
+ skb->sk = sk;
+ skb->destructor = sock_edemux;
+}
+
static unsigned int
tproxy_tg4(struct sk_buff *skb, __be32 laddr, __be16 lport,
u_int32_t mark_mask, u_int32_t mark_value)
diff --git a/net/netfilter/xt_addrtype.c b/net/netfilter/xt_addrtype.c
index 68ff29f..fab6eea 100644
--- a/net/netfilter/xt_addrtype.c
+++ b/net/netfilter/xt_addrtype.c
@@ -202,7 +202,7 @@ static int addrtype_mt_checkentry_v1(const struct xt_mtchk_param *par)
return -EINVAL;
}
if ((info->source | info->dest) >= XT_ADDRTYPE_PROHIBIT) {
- pr_err("ipv6 PROHIBT (THROW, NAT ..) matching not supported\n");
+ pr_err("ipv6 PROHIBIT (THROW, NAT ..) matching not supported\n");
return -EINVAL;
}
if ((info->source | info->dest) & XT_ADDRTYPE_BROADCAST) {
diff --git a/net/netfilter/xt_socket.c b/net/netfilter/xt_socket.c
index 20b1591..06df2b9 100644
--- a/net/netfilter/xt_socket.c
+++ b/net/netfilter/xt_socket.c
@@ -19,12 +19,12 @@
#include <net/icmp.h>
#include <net/sock.h>
#include <net/inet_sock.h>
-#include <net/netfilter/nf_tproxy_core.h>
#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
#define XT_SOCKET_HAVE_IPV6 1
#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/inet6_hashtables.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#endif
@@ -101,6 +101,43 @@ extract_icmp4_fields(const struct sk_buff *skb,
return 0;
}
+/* "socket" match based redirection (no specific rule)
+ * ===================================================
+ *
+ * There are connections with dynamic endpoints (e.g. FTP data
+ * connection) that the user is unable to add explicit rules
+ * for. These are taken care of by a generic "socket" rule. It is
+ * assumed that the proxy application is trusted to open such
+ * connections without explicit iptables rule (except of course the
+ * generic 'socket' rule). In this case the following sockets are
+ * matched in preference order:
+ *
+ * - match: if there's a fully established connection matching the
+ * _packet_ tuple
+ *
+ * - match: if there's a non-zero bound listener (possibly with a
+ * non-local address) We don't accept zero-bound listeners, since
+ * then local services could intercept traffic going through the
+ * box.
+ */
+static struct sock *
+xt_socket_get_sock_v4(struct net *net, const u8 protocol,
+ const __be32 saddr, const __be32 daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in)
+{
+ switch (protocol) {
+ case IPPROTO_TCP:
+ return __inet_lookup(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ case IPPROTO_UDP:
+ return udp4_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ }
+ return NULL;
+}
+
static bool
socket_match(const struct sk_buff *skb, struct xt_action_param *par,
const struct xt_socket_mtinfo1 *info)
@@ -156,9 +193,9 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
#endif
if (!sk)
- sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol,
+ sk = xt_socket_get_sock_v4(dev_net(skb->dev), protocol,
saddr, daddr, sport, dport,
- par->in, NFT_LOOKUP_ANY);
+ par->in);
if (sk) {
bool wildcard;
bool transparent = true;
@@ -265,6 +302,25 @@ extract_icmp6_fields(const struct sk_buff *skb,
return 0;
}
+static struct sock *
+xt_socket_get_sock_v6(struct net *net, const u8 protocol,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in)
+{
+ switch (protocol) {
+ case IPPROTO_TCP:
+ return inet6_lookup(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ case IPPROTO_UDP:
+ return udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ }
+
+ return NULL;
+}
+
static bool
socket_mt6_v1_v2(const struct sk_buff *skb, struct xt_action_param *par)
{
@@ -302,9 +358,9 @@ socket_mt6_v1_v2(const struct sk_buff *skb, struct xt_action_param *par)
}
if (!sk)
- sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto,
+ sk = xt_socket_get_sock_v6(dev_net(skb->dev), tproto,
saddr, daddr, sport, dport,
- par->in, NFT_LOOKUP_ANY);
+ par->in);
if (sk) {
bool wildcard;
bool transparent = true;