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tcp: Add a TCP_FASTOPEN socket option to get a max backlog on its listner

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This patch adds a TCP_FASTOPEN socket option to get a max backlog on its
listener to getsockopt().

Signed-off-by: Kenjiro Nakayama <nakayamakenjiro@gmail.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kenjiro Nakayama 2014-04-17 01:25:01 +09:00 committed by David S. Miller
parent 6ff01dbb11
commit 1536e2857b
1 changed files with 8 additions and 0 deletions
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8
net/ipv4/tcp.c
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@ -2916,6 +2916,14 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
case TCP_USER_TIMEOUT:
val = jiffies_to_msecs(icsk->icsk_user_timeout);
break;
case TCP_FASTOPEN:
if (icsk->icsk_accept_queue.fastopenq != NULL)
val = icsk->icsk_accept_queue.fastopenq->max_qlen;
else
val = 0;
break;
case TCP_TIMESTAMP:
val = tcp_time_stamp + tp->tsoffset;
break;