net: Loopback ifindex is constant now

As pointed out, there are places, that access net->loopback_dev->ifindex
and after ifindex generation is made per-net this value becomes constant
equals 1. So go ahead and introduce the LOOPBACK_IFINDEX constant and use
it where appropriate.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8e80fd279100..0ddf2d132e7f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -965,7 +965,7 @@ struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
 {
         int flags = 0;
 
-        fl6->flowi6_iif = net->loopback_dev->ifindex;
+        fl6->flowi6_iif = LOOPBACK_IFINDEX;
 
         if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
                 flags |= RT6_LOOKUP_F_IFACE;