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tcp: properly account Fast Open SYN-ACK retrans

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Since the TFO socket is accepted right off SYN-data, the socket
owner can call getsockopt(TCP_INFO) to collect ongoing SYN-ACK
retransmission or timeout stats (i.e., tcpi_total_retrans,
tcpi_retransmits). Currently those stats are only updated
upon handshake completes. This patch fixes it.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng 2016-09-21 16:16:15 -07:00 committed by David S. Miller
parent de1d657816
commit 7e32b44361
3 changed files with 4 additions and 1 deletions
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2
net/ipv4/tcp_input.c
View File

@ -5885,7 +5885,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
* so release it.
*/
if (req) {
tp->total_retrans = req->num_retrans;
inet_csk(sk)->icsk_retransmits = 0;
reqsk_fastopen_remove(sk, req, false);
} else {
/* Make sure socket is routed, for correct metrics. */

2
net/ipv4/tcp_output.c
View File

@ -3568,6 +3568,8 @@ int tcp_rtx_synack(const struct sock *sk, struct request_sock *req)
if (!res) {
__TCP_INC_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS);
__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
if (unlikely(tcp_passive_fastopen(sk)))
tcp_sk(sk)->total_retrans++;
}
return res;
}

1
net/ipv4/tcp_timer.c
View File

@ -384,6 +384,7 @@ static void tcp_fastopen_synack_timer(struct sock *sk)
*/
inet_rtx_syn_ack(sk, req);
req->num_timeout++;
icsk->icsk_retransmits++;
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
}