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/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 8eec8f4a0536..3a57570c8ee5 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1798,7 +1798,7 @@ static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
                 .flowi4_oif = (rt_is_output_route(rt) ?
                                skb->dev->ifindex : 0),
                 .flowi4_iif = (rt_is_output_route(rt) ?
-                               net->loopback_dev->ifindex :
+                               LOOPBACK_IFINDEX :
                                skb->dev->ifindex),
                 .flowi4_mark = skb->mark,
         };