From: liujian <liujia...@huawei.com>
After the tcp socket go to ESTABLISHED stat, change IP address (server
side),
then the tcp socket will go tcp_probe_timer process.
[root@localhost net]# netstat -toe
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
User Inode Timer
tcp 0 1104 9.81.254:personal-agent 9.84.201.213:23597 ESTABLISHED
root 12819 probe (4.36/0/7)
[root@localhost net]# cat /proc/net/tcp
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt
uid timeout inode
3: B1FE5109:15B3 D5C95409:5C2D 01 00000495:00000000 04:0000005E 00000000
0 7 12819 2 ffff95cdcf45a000 20 4 1 10 -1
In my test case, tcp_write_queue_head(sk) and tcp_send_head(sk) is same
SKB.
And ((s32)(tcp_time_stamp(tp) - start_ts) >
jiffies_to_msecs(icsk->icsk_user_timeout))
always is false.
Here use keepalive_time_elapsed(tp) to do the compare as
tcp_keepalive_timer do.
Signed-off-by: liujian <liujia...@huawei.com>
---
net/ipv4/tcp_timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 655dd8d..2a28a03 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -325,7 +325,7 @@ static void tcp_probe_timer(struct sock *sk)
if (!start_ts)
tcp_send_head(sk)->skb_mstamp = tp->tcp_mstamp;
else if (icsk->icsk_user_timeout &&
- (s32)(tcp_time_stamp(tp) - start_ts) >
+ keepalive_time_elapsed(tp) >=
jiffies_to_msecs(icsk->icsk_user_timeout))
goto abort;
--
1.8.3.1
