This is a note to let you know that I've just added the patch titled
tcp_v4_send_reset: binding oif to iif in no sock case
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tcp_v4_send_reset-binding-oif-to-iif-in-no-sock-case.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f96e07ebea3efd0dc063d7e4465905fd0e0a09f4 Mon Sep 17 00:00:00 2001
From: Shawn Lu <[email protected]>
Date: Sat, 4 Feb 2012 12:38:09 +0000
Subject: tcp_v4_send_reset: binding oif to iif in no sock case
From: Shawn Lu <[email protected]>
[ Upstream commit e2446eaab5585555a38ea0df4e01ff313dbb4ac9 ]
Binding RST packet outgoing interface to incoming interface
for tcp v4 when there is no socket associate with it.
when sk is not NULL, using sk->sk_bound_dev_if instead.
(suggested by Eric Dumazet).
This has few benefits:
1. tcp_v6_send_reset already did that.
2. This helps tcp connect with SO_BINDTODEVICE set. When
connection is lost, we still able to sending out RST using
same interface.
3. we are sending reply, it is most likely to be succeed
if iif is used
Signed-off-by: Shawn Lu <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ipv4/tcp_ipv4.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -650,6 +650,11 @@ static void tcp_v4_send_reset(struct soc
arg.iov[0].iov_len, IPPROTO_TCP, 0);
arg.csumoffset = offsetof(struct tcphdr, check) / 2;
arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK
: 0;
+ /* When socket is gone, all binding information is lost.
+ * routing might fail in this case. using iif for oif to
+ * make sure we can deliver it
+ */
+ arg.bound_dev_if = sk ? sk->sk_bound_dev_if : inet_iif(skb);
net = dev_net(skb_dst(skb)->dev);
ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/tcp_v4_send_reset-binding-oif-to-iif-in-no-sock-case.patch
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