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authorEric Dumazet <edumazet@google.com>2016-10-26 09:27:57 -0700
committerDavid S. Miller <davem@davemloft.net>2016-10-29 15:09:21 -0400
commit5ea8ea2cb7f1d0db15762c9b0bb9e7330425a071 (patch)
tree46fb718cf8da30f0cbb023e19081921cac3832a0 /include
parent58effd7168e9b74252650a008b5229c7cf224c7b (diff)
downloadlinux-5ea8ea2cb7f1d0db15762c9b0bb9e7330425a071.tar.bz2
tcp/dccp: drop SYN packets if accept queue is full
Per listen(fd, backlog) rules, there is really no point accepting a SYN, sending a SYNACK, and dropping the following ACK packet if accept queue is full, because application is not draining accept queue fast enough. This behavior is fooling TCP clients that believe they established a flow, while there is nothing at server side. They might then send about 10 MSS (if using IW10) that will be dropped anyway while server is under stress. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/inet_connection_sock.h5
1 files changed, 0 insertions, 5 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 197a30d221e9..146054ceea8e 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -289,11 +289,6 @@ static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
}
-static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
-{
- return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
-}
-
static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
{
return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;