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tcp: Increment LISTENOVERFLOW and LISTENDROPS in tcp_v4_conn_request() 

We drop a connection request if the accept backlog is full and there are
sufficient packets in the syn queue to warrant starting drops. Increment the
appropriate counters so this isn't silent, for accurate stats and help in
debugging.

This patch assumes LINUX_MIB_LISTENDROPS is a superset of/includes the
counter LINUX_MIB_LISTENOVERFLOWS.

Signed-off-by: Nivedita Singhvi <niv@us.ibm.com>
Acked-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nivedita Singhvi 2013-01-28 17:52:37 +00:00 committed by David S. Miller
parent 5e98a36ed4
commit 2aeef18d37
1 changed files with 4 additions and 1 deletions
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5
net/ipv4/tcp_ipv4.c
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@ -1500,8 +1500,11 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
* clogging syn queue with openreqs with exponentially increasing
* timeout.
*/
if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
goto drop;
}
req = inet_reqsk_alloc(&tcp_request_sock_ops);
if (!req)