linux-kernel - [PATCH 4.2.y-ckt 126/211] ipv4: Fix ip_queue_xmit to pass sk into ip_local_out

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Message-Id: <1452023119-25647-127-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:43:54 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 126/211] ipv4: Fix ip_queue_xmit to pass sk into ip_local_out_sk

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

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

From: "Eric W. Biederman" <ebiederm@...ssion.com>

commit 850dcc4d4dd7d5da5c1b2a780c5e649c3b649545 upstream.

After a packet has been encapsulated by a tunnel we should use the
tunnel sockets local multicast loopback flag to control if the
encapsulated packet should be locally loopback back.

Pass sk into ip_local_out_sk so that in the rare case we are dealing
with a tunneled packet whose tunnel destination address is a multicast
address the kernel properly decides to loopback this packet.

In practice I don't think this matters as ip_queue_xmit is used by
tcp, l2tp and sctp none of which I am aware of uses ip level
multicasting as they are all point to point communications protocols.
Let's fix this before someone uses ip_queue_xmit for a tunnel protocol
that does use multicast.

Fixes: aad88724c9d5 ("ipv4: add a sock pointer to dst->output() path.")
Fixes: b0270e91014d ("ipv4: add a sock pointer to ip_queue_xmit()")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/ipv4/ip_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index f04d077..23fcc82 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -451,7 +451,7 @@ packet_routed:
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;

-	res = ip_local_out(skb);
+	res = ip_local_out_sk(sk, skb);
 	rcu_read_unlock();
 	return res;

-- 
1.9.1

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