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authorEric Dumazet <edumazet@google.com>2015-04-09 13:31:56 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-29 10:33:55 +0200
commitef15025a4eb2cecc162a349bef1392b620966e40 (patch)
treeb41cc3bb61ed9655342cc8b8e0bd0735b0b158e4 /net
parentc31d60c29774e1c5650f89d5edccfd8314152af6 (diff)
downloadlinux-linaro-stable-ef15025a4eb2cecc162a349bef1392b620966e40.tar.gz
tcp: tcp_make_synack() should clear skb->tstamp
[ Upstream commit b50edd7812852d989f2ef09dcfc729690f54a42d ] I noticed tcpdump was giving funky timestamps for locally generated SYNACK messages on loopback interface. 11:42:46.938990 IP 127.0.0.1.48245 > 127.0.0.2.23850: S 945476042:945476042(0) win 43690 <mss 65495,nop,nop,sackOK,nop,wscale 7> 20:28:58.502209 IP 127.0.0.2.23850 > 127.0.0.1.48245: S 3160535375:3160535375(0) ack 945476043 win 43690 <mss 65495,nop,nop,sackOK,nop,wscale 7> This is because we need to clear skb->tstamp before entering lower stack, otherwise net_timestamp_check() does not set skb->tstamp. Fixes: 7faee5c0d514 ("tcp: remove TCP_SKB_CB(skb)->when") Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_output.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 92b5e1f7d3b0..7681a1bbd97f 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2772,6 +2772,8 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
}
#endif
+ /* Do not fool tcpdump (if any), clean our debris */
+ skb->tstamp.tv64 = 0;
return skb;
}
EXPORT_SYMBOL(tcp_make_synack);