tcp: tcp_make_synack() should clear skb->tstamp
[ Upstream commitb50edd7812
] 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:7faee5c0d5
("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>
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@ -2796,6 +2796,8 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
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}
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#endif
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/* Do not fool tcpdump (if any), clean our debris */
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skb->tstamp.tv64 = 0;
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return skb;
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}
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EXPORT_SYMBOL(tcp_make_synack);
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