bridge: drop netfilter fake rtable unconditionally

BugLink: https://bugs.launchpad.net/bugs/1672470
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@redhat.com>
Debugged-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry-picked from upstream commit a13b2082ece95247779b9995c4e91b4246bed023)
Signed-off-by: Dan Streetman <dan.streetman@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index f7fba74108a9377b12610c9cdfa033dc8c7c92a0..e24754a0e052b3c672f61fd453b2feedc63eee68 100644 (file)
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -29,6 +29,7 @@ EXPORT_SYMBOL(br_should_route_hook);
 static int
 br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
+       br_drop_fake_rtable(skb);
        return netif_receive_skb(skb);
 }
 

diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index 7ddbe7ec81d61d4971b919c5988e7bed93436dec..97fc19f001bfff9daa2d5f5af3e00f59bd46d0bd 100644 (file)
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -516,21 +516,6 @@ static unsigned int br_nf_pre_routing(void *priv,
 }
 
 
-/* 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(void *priv,
-                                  struct sk_buff *skb,
-                                  const struct nf_hook_state *state)
-{
-       br_drop_fake_rtable(skb);
-       return NF_ACCEPT;
-}
-
 /* PF_BRIDGE/FORWARD *************************************************/
 static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
@@ -900,12 +885,6 @@ static struct nf_hook_ops br_nf_ops[] __read_mostly = {
                .hooknum = NF_BR_PRE_ROUTING,
                .priority = NF_BR_PRI_BRNF,
        },
-       {
-               .hook = br_nf_local_in,
-               .pf = NFPROTO_BRIDGE,
-               .hooknum = NF_BR_LOCAL_IN,
-               .priority = NF_BR_PRI_BRNF,
-       },
        {
                .hook = br_nf_forward_ip,
                .pf = NFPROTO_BRIDGE,