[IPV6]: Check interface bindings on IPv6 raw socket reception

Take account of whether a socket is bound to a particular device when
selecting an IPv6 raw socket to receive a packet. Also perform this
check when receiving IPv6 packets with router alert options.

Signed-off-by: Andrew McDonald <andrew@mcdonald.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a7fcbcc83576..00f85148b85f 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -277,7 +277,9 @@ static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
         read_lock(&ip6_ra_lock);
         for (ra = ip6_ra_chain; ra; ra = ra->next) {
                 struct sock *sk = ra->sk;
-                if (sk && ra->sel == sel) {
+                if (sk && ra->sel == sel &&
+                    (!sk->sk_bound_dev_if ||
+                     sk->sk_bound_dev_if == skb->dev->ifindex)) {
                         if (last) {
                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
                                 if (skb2)