linux-kernel - [PATCH 4.9 039/120] bridge: netfilter: Fix dropping packets that moving through bridge interface

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Date:   Wed, 18 Jan 2017 11:45:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Artur Molchanov <artur.molchanov@...esis.ru>,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.9 039/120] bridge: netfilter: Fix dropping packets that moving through bridge interface

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Artur Molchanov <arturmolchanov@...il.com>

commit 14221cc45caad2fcab3a8543234bb7eda9b540d5 upstream.

Problem:
br_nf_pre_routing_finish() calls itself instead of
br_nf_pre_routing_finish_bridge(). Due to this bug reverse path filter drops
packets that go through bridge interface.

User impact:
Local docker containers with bridge network can not communicate with each
other.

Fixes: c5136b15ea36 ("netfilter: bridge: add and use br_nf_hook_thresh")
Signed-off-by: Artur Molchanov <artur.molchanov@...esis.ru>
Acked-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bridge/br_netfilter_hooks.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -399,7 +399,7 @@ bridged_dnat:
 				br_nf_hook_thresh(NF_BR_PRE_ROUTING,
 						  net, sk, skb, skb->dev,
 						  NULL,
-						  br_nf_pre_routing_finish);
+						  br_nf_pre_routing_finish_bridge);
 				return 0;
 			}
 			ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr);