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tcp: add SYN/data info to TCP_INFO

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Add a bit TCPI_OPT_SYN_DATA (32) to the socket option TCP_INFO:tcpi_options.
It's set if the data in SYN (sent or received) is acked by SYN-ACK. Server or
client application can use this information to check Fast Open success rate.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng
2012-10-19 15:14:44 +00:00
committed by David S. Miller
parent e6e71054cd
commit 6f73601efb
6 changed files with 8 additions and 1 deletions
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1
net/ipv4/tcp_input.c
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@ -5646,6 +5646,7 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
tcp_rearm_rto(sk);
return true;
}
tp->syn_data_acked = tp->syn_data;
return false;
}