From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/4] netfilter: bridge: fix routing of bridge frames with call-iptables=1
Date: Fri, 18 Sep 2015 11:17:54 +0200 [thread overview]
Message-ID: <1442567876-4046-3-git-send-email-pablo@netfilter.org> (raw)
In-Reply-To: <1442567876-4046-1-git-send-email-pablo@netfilter.org>
From: Florian Westphal <fw@strlen.de>
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: 72b1e5e4cac7 ("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>
---
include/linux/skbuff.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2738d35..9987af0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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
--
1.7.10.4
next prev parent reply other threads:[~2015-09-18 9:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-18 9:17 [PATCH 0/4] Netfilter fixes for net Pablo Neira Ayuso
2015-09-18 9:17 ` [PATCH 1/4] netfilter: nf_log: don't zap all loggers on unregister Pablo Neira Ayuso
2015-09-18 9:17 ` Pablo Neira Ayuso [this message]
2015-09-18 9:17 ` [PATCH 3/4] netfilter: nft_compat: skip family comparison in case of NFPROTO_UNSPEC Pablo Neira Ayuso
2015-09-18 9:17 ` [PATCH 4/4] netfilter: nf_log: wait for rcu grace after logger unregistration Pablo Neira Ayuso
2015-09-21 5:32 ` [PATCH 0/4] Netfilter fixes for net David Miller
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