tcp: set timestamps for restored skb-s

When the repair mode is turned off, the write queue seqs are
updated so that the whole queue is considered to be 'already sent.

The "when" field must be set for such skb. It's used in tcp_rearm_rto
for example. If the "when" field isn't set, the retransmit timeout can
be calculated incorrectly and a tcp connected can stop for two minutes
(TCP_RTO_MAX).

Acked-by: Pavel Emelyanov <xemul@parallels.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5423223e93c25074f87c92dc60b338fddcb66f3f..b2f6c74861af6d8e1209c65823bef34f806609c2 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1120,6 +1120,13 @@ new_segment:
                                if (!skb)
                                        goto wait_for_memory;
 
+                               /*
+                                * All packets are restored as if they have
+                                * already been sent.
+                                */
+                               if (tp->repair)
+                                       TCP_SKB_CB(skb)->when = tcp_time_stamp;
+
                                /*
                                 * Check whether we can use HW checksum.
                                 */