[Devel] [PATCH vz7] bridge: drop netfilter fake rtable unconditionally

[Cyrill Gorcunov]

From: Florian Westphal <fw at strlen.de>

Andreas reports kernel oops during rmmod of the br_netfilter module.
Hannes debugged the oops down to a NULL rt6info->rt6i_indev.

Problem is that br_netfilter has the nasty concept of adding a fake
rtable to skb->dst; this happens in a br_netfilter prerouting hook.

A second hook (in bridge LOCAL_IN) is supposed to remove these again
before the skb is handed up the stack.

However, on module unload hooks get unregistered which means an
skb could traverse the prerouting hook that attaches the fake_rtable,
while the 'fake rtable remove' hook gets removed from the hooklist
immediately after.

Fixes: 34666d467cbf1e2e3c7 ("netfilter: bridge: move br_netfilter out of the core")
Reported-by: Andreas Karis <akaris at redhat.com>
Debugged-by: Hannes Frederic Sowa <hannes at stressinduktion.org>
Signed-off-by: Florian Westphal <fw at strlen.de>
Acked-by: Pablo Neira Ayuso <pablo at netfilter.org>
Signed-off-by: David S. Miller <davem at davemloft.net>

Backport of a13b2082ece95247779b9995c4e91b4246bed023
https://jira.sw.ru/browse/PSBM-64412

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---

Guys, take a look please, this should do the trick.

 net/bridge/br_input.c           |    2 ++
 net/bridge/br_netfilter.c       |   24 ------------------------
 net/bridge/br_netfilter_hooks.c |   24 ------------------------
 3 files changed, 2 insertions(+), 48 deletions(-)

Index: linux-pcs7.git/net/bridge/br_input.c
===================================================================
--- linux-pcs7.git.orig/net/bridge/br_input.c
+++ linux-pcs7.git/net/bridge/br_input.c
@@ -53,6 +53,8 @@ static int br_pass_frame_up(struct sk_bu
 	if (!skb)
 		return NET_RX_DROP;
 
+	br_drop_fake_rtable(skb);
+
 	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, NULL, skb,
 		       indev, NULL,
 		       netif_receive_skb_sk);
Index: linux-pcs7.git/net/bridge/br_netfilter.c
===================================================================
--- linux-pcs7.git.orig/net/bridge/br_netfilter.c
+++ linux-pcs7.git/net/bridge/br_netfilter.c
@@ -760,23 +760,6 @@ static unsigned int br_nf_pre_routing(co
 }
 
 
-/* PF_BRIDGE/LOCAL_IN ************************************************/
-/* The packet is locally destined, which requires a real
- * dst_entry, so detach the fake one.  On the way up, the
- * packet would pass through PRE_ROUTING again (which already
- * took place when the packet entered the bridge), but we
- * register an IPv4 PRE_ROUTING 'sabotage' hook that will
- * prevent this from happening. */
-static unsigned int br_nf_local_in(const struct nf_hook_ops *ops,
-				   struct sk_buff *skb,
-				   const struct net_device *in,
-				   const struct net_device *out,
-				   const struct nf_hook_state *state)
-{
-	br_drop_fake_rtable(skb);
-	return NF_ACCEPT;
-}
-
 /* PF_BRIDGE/FORWARD *************************************************/
 static int br_nf_forward_finish(struct sock *sk, struct sk_buff *skb)
 {
@@ -1027,13 +1010,6 @@ static struct nf_hook_ops br_nf_ops[] __
 		.priority = NF_BR_PRI_BRNF,
 	},
 	{
-		.hook = br_nf_local_in,
-		.owner = THIS_MODULE,
-		.pf = NFPROTO_BRIDGE,
-		.hooknum = NF_BR_LOCAL_IN,
-		.priority = NF_BR_PRI_BRNF,
-	},
-	{
 		.hook = br_nf_forward_ip,
 		.owner = THIS_MODULE,
 		.pf = NFPROTO_BRIDGE,
Index: linux-pcs7.git/net/bridge/br_netfilter_hooks.c
===================================================================
--- linux-pcs7.git.orig/net/bridge/br_netfilter_hooks.c
+++ linux-pcs7.git/net/bridge/br_netfilter_hooks.c
@@ -520,23 +520,6 @@ static unsigned int br_nf_pre_routing(co
 }
 
 
-/* PF_BRIDGE/LOCAL_IN ************************************************/
-/* The packet is locally destined, which requires a real
- * dst_entry, so detach the fake one.  On the way up, the
- * packet would pass through PRE_ROUTING again (which already
- * took place when the packet entered the bridge), but we
- * register an IPv4 PRE_ROUTING 'sabotage' hook that will
- * prevent this from happening. */
-static unsigned int br_nf_local_in(const struct nf_hook_ops *ops,
-				   struct sk_buff *skb,
-				   const struct net_device *in,
-				   const struct net_device *out,
-				   const struct nf_hook_state *state)
-{
-	br_drop_fake_rtable(skb);
-	return NF_ACCEPT;
-}
-
 /* PF_BRIDGE/FORWARD *************************************************/
 static int br_nf_forward_finish(struct sock *sk, struct sk_buff *skb)
 {
@@ -922,13 +905,6 @@ static struct nf_hook_ops br_nf_ops[] __
 		.priority = NF_BR_PRI_BRNF,
 	},
 	{
-		.hook = br_nf_local_in,
-		.owner = THIS_MODULE,
-		.pf = NFPROTO_BRIDGE,
-		.hooknum = NF_BR_LOCAL_IN,
-		.priority = NF_BR_PRI_BRNF,
-	},
-	{
 		.hook = br_nf_forward_ip,
 		.owner = THIS_MODULE,
 		.pf = NFPROTO_BRIDGE,