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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: 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 08:24:19 +00:00 committed by David S. Miller
parent 848bf15f36
commit 5f1e942cb4
1 changed files with 5 additions and 1 deletions
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6
net/ipv6/tcp_ipv6.c
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@ -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 @@ drop_and_release:
drop_and_free:
reqsk_free(req);
drop:
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
return 0; /* don't send reset */
}