ipv4: Make rt->fl.iif tests lest obscure.

When we test rt->fl.iif against zero, we're seeing if it's
an output or an input route.

Make that explicit with some helper functions.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 70ff77f02eee..cab2057d5430 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -634,7 +634,7 @@ static int ipgre_rcv(struct sk_buff *skb)
 #ifdef CONFIG_NET_IPGRE_BROADCAST
                 if (ipv4_is_multicast(iph->daddr)) {
                         /* Looped back packet, drop it! */
-                        if (skb_rtable(skb)->fl.iif == 0)
+                        if (rt_is_output_route(skb_rtable(skb)))
                                 goto drop;
                         tunnel->dev->stats.multicast++;
                         skb->pkt_type = PACKET_BROADCAST;