@@ -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:
@@ -954,12 +955,16 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
- if (!want_cookie)
+ if (!want_cookie) {
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
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 +1113,7 @@ 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 */
}
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> --- Ignored "line over 80 chars" warning for readability. net/ipv6/tcp_ipv6.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-)