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netfilter: bridge: fix routing of bridge frames with call-iptables=1 

We can't re-use the physoutdev storage area.

1.  When using NFQUEUE in PREROUTING, we attempt to bump a bogus
refcnt since nf_bridge->physoutdev is garbage (ipv4/ipv6 address)

2. for same reason, we crash in physdev match in FORWARD or later if
skb is routed instead of bridged.

This increases nf_bridge_info to 40 bytes, but we have no other choice.

Fixes: 72b1e5e4ca ("netfilter: bridge: reduce nf_bridge_info to 32 bytes again")
Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-09-14 17:06:27 +02:00 committed by Pablo Neira Ayuso
parent 205ee117d4
commit 63cdbc06b3
1 changed files with 3 additions and 3 deletions
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6
include/linux/skbuff.h
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@ -179,6 +179,9 @@ struct nf_bridge_info {
u8 bridged_dnat:1;
__u16 frag_max_size;
struct net_device *physindev;
/* always valid & non-NULL from FORWARD on, for physdev match */
struct net_device *physoutdev;
union {
/* prerouting: detect dnat in orig/reply direction */
__be32 ipv4_daddr;
@ -189,9 +192,6 @@ struct nf_bridge_info {
* skb is out in neigh layer.
*/
char neigh_header[8];
/* always valid & non-NULL from FORWARD on, for physdev match */
struct net_device *physoutdev;
};
};
#endif