[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, 3 insertions, 3 deletions

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b854431047a4..d6e76f5229cc 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -449,7 +449,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
                 struct ip_options * opt = NULL;
                 if (optlen > 40 || optlen < 0)
                         goto e_inval;
-                err = ip_options_get_from_user(sk->sk_net, &opt,
+                err = ip_options_get_from_user(sock_net(sk), &opt,
                                                optval, optlen);
                 if (err)
                         break;
@@ -590,13 +590,13 @@ static int do_ip_setsockopt(struct sock *sk, int level,
                                 err = 0;
                                 break;
                         }
-                        dev = ip_dev_find(sk->sk_net, mreq.imr_address.s_addr);
+                        dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
                         if (dev) {
                                 mreq.imr_ifindex = dev->ifindex;
                                 dev_put(dev);
                         }
                 } else
-                        dev = __dev_get_by_index(sk->sk_net, mreq.imr_ifindex);
+                        dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
 
 
                 err = -EADDRNOTAVAIL;