[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.

Introduce per-sock inlines: sock_net(), sock_net_set()
and per-inet_timewait_sock inlines: twsk_net(), twsk_net_set().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 913266cd9902..08349267ceb4 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -351,7 +351,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
                          * itself out.
                          */
                         security_sk_classify_flow(sk, &fl);
-                        if (ip_route_output_flow(sk->sk_net, &rt, &fl, sk, 0))
+                        if (ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0))
                                 goto no_route;
                 }
                 sk_setup_caps(sk, &rt->u.dst);
@@ -1382,7 +1382,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
                                                  .dport = tcp_hdr(skb)->source } },
                                     .proto = sk->sk_protocol };
                 security_skb_classify_flow(skb, &fl);
-                if (ip_route_output_key(sk->sk_net, &rt, &fl))
+                if (ip_route_output_key(sock_net(sk), &rt, &fl))
                         return;
         }