[PATCH net-next] net: tcp: update mib LISTENOVERFLOWS if syn flood

[yuan linyu]

From: yuan linyu <linyu.y...@alcatel-sbell.com.cn>

it's better to update mib LISTENOVERFLOWS even if packet is flood

Signed-off-by: yuan linyu <linyu.y...@alcatel-sbell.com.cn>
---
 net/ipv4/tcp_input.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 451ef3012636..581f5b03ae54 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6220,6 +6220,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
        struct sock *fastopen_sk = NULL;
        struct request_sock *req;
        bool want_cookie = false;
+       bool want_drop = false;
        struct dst_entry *dst;
        struct flowi fl;
 
@@ -6231,14 +6232,17 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
             inet_csk_reqsk_queue_is_full(sk)) && !isn) {
                want_cookie = tcp_syn_flood_action(sk, skb, rsk_ops->slab_name);
                if (!want_cookie)
-                       goto drop;
+                       want_drop = true;
        }
 
        if (sk_acceptq_is_full(sk)) {
                NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
-               goto drop;
+               want_drop = true;
        }
 
+       if (want_drop)
+               goto drop;
+
        req = inet_reqsk_alloc(rsk_ops, sk, !want_cookie);
        if (!req)
                goto drop;
-- 
2.14.1