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Commit 848bf15f authored by Vijay Subramanian's avatar Vijay Subramanian Committed by David S. Miller
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tcp: Update MIB counters for drops 



This patch updates LINUX_MIB_LISTENDROPS in tcp_v4_conn_request() and
tcp_v4_err(). tcp_v4_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 9665d5d6

net/ipv4/tcp_ipv4.c

+2 −1
Original line number Diff line number Diff line
@@ -496,6 +496,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) 
		 * errors returned from accept().

		 */

		inet_csk_reqsk_queue_drop(sk, req, prev);

		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);

		goto out;



	case TCP_SYN_SENT:
@@ -1502,7 +1503,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) 
	 */

	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;

	}
@@ -1669,6 +1669,7 @@ int tcp_v4_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;

}

EXPORT_SYMBOL(tcp_v4_conn_request);