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tcp: Update MIB counters for drops

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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: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Subramanian 2013-01-31 08:24:06 +00:00 committed by David S. Miller
parent 9665d5d624
commit 848bf15f36
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/tcp_ipv4.c
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@ -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);