ipv4: Namespaceify tcp_max_syn_backlog knob

Different namespace application might require different maximal
number of remembered connection requests.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index c61480249835..ec6d84363024 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6377,8 +6377,8 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
                 }
                 /* Kill the following clause, if you dislike this way. */
                 else if (!net->ipv4.sysctl_tcp_syncookies &&
-                         (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
-                          (sysctl_max_syn_backlog >> 2)) &&
+                         (net->ipv4.sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
+                          (net->ipv4.sysctl_max_syn_backlog >> 2)) &&
                          !tcp_peer_is_proven(req, dst, false,
                                              tmp_opt.saw_tstamp)) {
                         /* Without syncookies last quarter of