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tcp: tcp_v[46]_conn_request: fix snt_synack initialization

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Commit 016818d07 (tcp: TCP Fast Open Server - take SYNACK RTT after
completing 3WHS) changes the code to only take a snt_synack timestamp
when a SYNACK transmit or retransmit succeeds. This behaviour is later
broken by commit 843f4a55e (tcp: use tcp_v4_send_synack on first
SYN-ACK), as snt_synack is now updated even if tcp_v4_send_synack
fails.

Also, commit 3a19ce0ee (tcp: IPv6 support for fastopen server) misses
the required IPv6 updates for 016818d07.

This patch makes sure that snt_synack is updated only when the SYNACK
trasnmit/retransmit succeeds, for both IPv4 and IPv6.

Cc: Cardwell <ncardwell@google.com>
Cc: Daniel Lee <longinus00@gmail.com>
Cc: Yuchung Cheng <ycheng@google.com>

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Octavian Purdila 2014-06-25 17:09:51 +03:00 committed by David S. Miller
parent 57b47553f6
commit aa27fc5018
2 changed files with 2 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
net/ipv4/tcp_ipv4.c
View file

@ -1370,7 +1370,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
goto drop_and_free;
tcp_rsk(req)->snt_isn = isn;
tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_openreq_init_rwin(req, sk, dst);
fastopen = !want_cookie &&
tcp_try_fastopen(sk, skb, req, &foc, dst);
@ -1380,7 +1379,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (err || want_cookie)
goto drop_and_free;
tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_rsk(req)->listener = NULL;
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
}

3
net/ipv6/tcp_ipv6.c
View file

@ -497,6 +497,8 @@ static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
skb_set_queue_mapping(skb, queue_mapping);
err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
err = net_xmit_eval(err);
if (!tcp_rsk(req)->snt_synack && !err)
tcp_rsk(req)->snt_synack = tcp_time_stamp;
}
done:
@ -1100,7 +1102,6 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
goto drop_and_free;
tcp_rsk(req)->snt_isn = isn;
tcp_rsk(req)->snt_synack = tcp_time_stamp;
tcp_openreq_init_rwin(req, sk, dst);
fastopen = !want_cookie &&
tcp_try_fastopen(sk, skb, req, &foc, dst);