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, 3 insertions, 3 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 21ad369014c0..c58137391a3d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1619,7 +1619,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 
         if (res.type == RTN_LOCAL) {
                 err = fib_validate_source(skb, saddr, daddr, tos,
-                                          net->loopback_dev->ifindex,
+                                          LOOPBACK_IFINDEX,
                                           dev, in_dev, &itag);
                 if (err < 0)
                         goto martian_source_keep_err;
@@ -1895,7 +1895,7 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
 
         orig_oif = fl4->flowi4_oif;
 
-        fl4->flowi4_iif = net->loopback_dev->ifindex;
+        fl4->flowi4_iif = LOOPBACK_IFINDEX;
         fl4->flowi4_tos = tos & IPTOS_RT_MASK;
         fl4->flowi4_scope = ((tos & RTO_ONLINK) ?
                          RT_SCOPE_LINK : RT_SCOPE_UNIVERSE);
@@ -1984,7 +1984,7 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
                 if (!fl4->daddr)
                         fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK);
                 dev_out = net->loopback_dev;
-                fl4->flowi4_oif = net->loopback_dev->ifindex;
+                fl4->flowi4_oif = LOOPBACK_IFINDEX;
                 res.type = RTN_LOCAL;
                 flags |= RTCF_LOCAL;
                 goto make_route;