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tcp: initialize sysctl_tcp_wan_timestamps to 1 by default. 

when sysctl_tcp_timestamps = 1 and tcp_wan_timestamps = 0,  client's SYN packet will contain
tcp timestamp option, but other segment not, which violate RFC 7323, which states:

" Once TSopt has been successfully negotiated, that is both <SYN> and
   <SYN,ACK> contain TSopt, the TSopt MUST be sent in every non-<RST>
   segment for the duration of the connection"

also, this will break peer server with syn cookie activated,  make it
clear window scale and timestamp option, causing poor transmit performance.

Signed-off-by: curuwang <curuwang@tencent.com>
This commit is contained in:
curuwang 2022-12-21 23:51:40 +08:00 committed by Honglin Li
parent 8fafa5a142
commit cf1f2c4f86
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/tcp_ipv4.c
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@ -3241,6 +3241,7 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_sack = 1;
net->ipv4.sysctl_tcp_window_scaling = 1;
net->ipv4.sysctl_tcp_timestamps = 1;
net->ipv4.sysctl_tcp_wan_timestamps = 1;
net->ipv4.sysctl_tcp_early_retrans = 3;
net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION;
net->ipv4.sysctl_tcp_slow_start_after_idle = 1; /* By default, RFC2861 behavior. */