ipv4: Fix raw socket lookup for local traffic

BugLink: https://bugs.launchpad.net/bugs/1830176

[ Upstream commit 19e4e768 ]

inet_iif should be used for the raw socket lookup. inet_iif considers
rt_iif which handles the case of local traffic.

As it stands, ping to a local address with the '-I <dev>' option fails
ever since ping was changed to use SO_BINDTODEVICE instead of
cmsg + IP_PKTINFO.

IPv6 works fine.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

net/ipv4/raw.c

@@ -168,6 +168,7 @@ static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
  */
 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 {
+	int dif = inet_iif(skb);
 	struct sock *sk;
 	struct hlist_head *head;
 	int delivered = 0;
@@ -180,8 +181,7 @@ static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 
 	net = dev_net(skb->dev);
 	sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
-			     iph->saddr, iph->daddr,
-			     skb->dev->ifindex);
+			     iph->saddr, iph->daddr, dif);
 
 	while (sk) {
 		delivered = 1;