ipv4: return valid RTA_IIF on ip route get

[ Upstream commit 91146153da2feab18efab2e13b0945b6bb704ded ]

Extend commit 13378cad02afc2adc6c0e07fca03903c7ada0b37
("ipv4: Change rt->rt_iif encoding.") from 3.6 to return valid
RTA_IIF on 'ip route get ... iif DEVICE' instead of rt_iif 0
which is displayed as 'iif *'.

inet_iif is not appropriate to use because skb_iif is not set.
Use the skb->dev->ifindex instead.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 4c011ec..db66057 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2364,7 +2364,7 @@ static int rt_fill_info(struct net *net,  __be32 dst, __be32 src,
                        }
                } else
 #endif
-                       if (nla_put_u32(skb, RTA_IIF, rt->rt_iif))
+                       if (nla_put_u32(skb, RTA_IIF, skb->dev->ifindex))
                                goto nla_put_failure;
        }