[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>

include/net/rawv6.h

@@ -10,7 +10,8 @@ extern rwlock_t raw_v6_lock;
 extern void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr);
 
 extern struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
-				    struct in6_addr *loc_addr, struct in6_addr *rmt_addr);
+				    struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
+				    int dif);
 
 extern int			rawv6_rcv(struct sock *sk,
 					  struct sk_buff *skb);

net/ipv6/icmp.c

@@ -551,7 +551,8 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info)
 
 	read_lock(&raw_v6_lock);
 	if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) {
-		while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) {
+		while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr,
+					    skb->dev->ifindex))) {
 			rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
 			sk = sk_next(sk);
 		}

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)

net/ipv6/raw.c

@@ -81,7 +81,8 @@ static void raw_v6_unhash(struct sock *sk)
 
 /* Grumble... icmp and ip_input want to get at this... */
 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
-			     struct in6_addr *loc_addr, struct in6_addr *rmt_addr)
+			     struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
+			     int dif)
 {
 	struct hlist_node *node;
 	int is_multicast = ipv6_addr_is_multicast(loc_addr);
@@ -94,6 +95,9 @@ struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
 			    !ipv6_addr_equal(&np->daddr, rmt_addr))
 				continue;
 
+			if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
+				continue;
+
 			if (!ipv6_addr_any(&np->rcv_saddr)) {
 				if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
 					goto found;
@@ -160,7 +164,7 @@ void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 	if (sk == NULL)
 		goto out;
 
-	sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr);
+	sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, skb->dev->ifindex);
 
 	while (sk) {
 		if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) {
@@ -170,7 +174,8 @@ void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 			if (clone)
 				rawv6_rcv(sk, clone);
 		}
-		sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr);
+		sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
+				     skb->dev->ifindex);
 	}
 out:
 	read_unlock(&raw_v6_lock);