ipv4: Namespaceify tcp_fastopen knob

Different namespace application might require enable TCP Fast Open
feature independently of the host.

This patch series continues making more of the TCP Fast Open related
sysctl knobs be per net-namespace.

Reported-by: Luca BRUNO <lucab@debian.org>
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.c b/net/ipv4/tcp.c
index 5091402720ab..dac56c4ad357 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1126,7 +1126,7 @@ static int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
         struct sockaddr *uaddr = msg->msg_name;
         int err, flags;
 
-        if (!(sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) ||
+        if (!(sock_net(sk)->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) ||
             (uaddr && msg->msg_namelen >= sizeof(uaddr->sa_family) &&
              uaddr->sa_family == AF_UNSPEC))
                 return -EOPNOTSUPP;
@@ -2759,7 +2759,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
         case TCP_FASTOPEN_CONNECT:
                 if (val > 1 || val < 0) {
                         err = -EINVAL;
-                } else if (sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) {
+                } else if (net->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) {
                         if (sk->sk_state == TCP_CLOSE)
                                 tp->fastopen_connect = val;
                         else