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/ipmr.c b/net/ipv4/ipmr.c
index 86dd5691af46..ef2b0089e0ea 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1654,7 +1654,7 @@ static int ip_mr_forward(struct net *net, struct mr_table *mrt,
         if (mrt->vif_table[vif].dev != skb->dev) {
                 int true_vifi;
 
-                if (skb_rtable(skb)->fl.iif == 0) {
+                if (rt_is_output_route(skb_rtable(skb))) {
                         /* It is our own packet, looped back.
                          * Very complicated situation...
                          *