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Commit 5f1e942c authored by Vijay Subramanian's avatar Vijay Subramanian Committed by David S. Miller
Browse files

tcp: ipv6: Update MIB counters for drops 



This patch updates LINUX_MIB_LISTENDROPS and LINUX_MIB_LISTENOVERFLOWS in
tcp_v6_conn_request() and tcp_v6_err(). tcp_v6_conn_request() in particular can
drop SYNs for various reasons which are not currently tracked.

Signed-off-by: default avatarVijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 848bf15f

net/ipv6/tcp_ipv6.c

+5 −1
Original line number Diff line number Diff line
@@ -423,6 +423,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 
		}



		inet_csk_reqsk_queue_drop(sk, req, prev);

		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);

		goto out;



	case TCP_SYN_SENT:
@@ -958,8 +959,10 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 
			goto drop;

	}



	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);

		goto drop;

	}



	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);

	if (req == NULL)
@@ -1108,6 +1111,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) 
drop_and_free:

	reqsk_free(req);

drop:

	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);

	return 0; /* don't send reset */

}