[NETNS][RAW]: Make ipv[46] raw sockets lookup namespaces aware.

This requires just to pass the appropriate struct net pointer
into __raw_v[46]_lookup and skip sockets that do not belong
to a needed namespace.

The proper net is get from skb->dev in all the cases.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/raw.c

@@ -116,16 +116,15 @@ static void raw_v4_unhash(struct sock *sk)
 	raw_unhash_sk(sk, &raw_v4_hashinfo);
 }
 
-static struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
-			     __be32 raddr, __be32 laddr,
-			     int dif)
+static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
+		unsigned short num, __be32 raddr, __be32 laddr, int dif)
 {
 	struct hlist_node *node;
 
 	sk_for_each_from(sk, node) {
 		struct inet_sock *inet = inet_sk(sk);
 
-		if (inet->num == num 					&&
+		if (sk->sk_net == net && inet->num == num 		&&
 		    !(inet->daddr && inet->daddr != raddr) 		&&
 		    !(inet->rcv_saddr && inet->rcv_saddr != laddr)	&&
 		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
@@ -169,12 +168,15 @@ static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
 	struct sock *sk;
 	struct hlist_head *head;
 	int delivered = 0;
+	struct net *net;
 
 	read_lock(&raw_v4_hashinfo.lock);
 	head = &raw_v4_hashinfo.ht[hash];
 	if (hlist_empty(head))
 		goto out;
-	sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
+
+	net = skb->dev->nd_net;
+	sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 			     iph->saddr, iph->daddr,
 			     skb->dev->ifindex);
 
@@ -187,7 +189,7 @@ static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
 			if (clone)
 				raw_rcv(sk, clone);
 		}
-		sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
+		sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 				     iph->saddr, iph->daddr,
 				     skb->dev->ifindex);
 	}
@@ -273,6 +275,7 @@ void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 	int hash;
 	struct sock *raw_sk;
 	struct iphdr *iph;
+	struct net *net;
 
 	hash = protocol & (RAW_HTABLE_SIZE - 1);
 
@@ -280,8 +283,10 @@ void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 	if (raw_sk != NULL) {
 		iph = (struct iphdr *)skb->data;
-		while ((raw_sk = __raw_v4_lookup(raw_sk, protocol, iph->daddr,
-						iph->saddr,
+		net = skb->dev->nd_net;
+
+		while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
+						iph->daddr, iph->saddr,
 						skb->dev->ifindex)) != NULL) {
 			raw_err(raw_sk, skb, info);
 			raw_sk = sk_next(raw_sk);

net/ipv6/raw.c

@@ -76,8 +76,9 @@ static void raw_v6_unhash(struct sock *sk)
 }
 
 
-static struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
-		struct in6_addr *loc_addr, struct in6_addr *rmt_addr, int dif)
+static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
+		unsigned short num, 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);
@@ -86,6 +87,9 @@ static struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
 		if (inet_sk(sk)->num == num) {
 			struct ipv6_pinfo *np = inet6_sk(sk);
 
+			if (sk->sk_net != net)
+				continue;
+
 			if (!ipv6_addr_any(&np->daddr) &&
 			    !ipv6_addr_equal(&np->daddr, rmt_addr))
 				continue;
@@ -165,6 +169,7 @@ static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 	struct sock *sk;
 	int delivered = 0;
 	__u8 hash;
+	struct net *net;
 
 	saddr = &ipv6_hdr(skb)->saddr;
 	daddr = saddr + 1;
@@ -182,7 +187,8 @@ static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 	if (sk == NULL)
 		goto out;
 
-	sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
+	net = skb->dev->nd_net;
+	sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
 
 	while (sk) {
 		int filtered;
@@ -225,7 +231,7 @@ static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 				rawv6_rcv(sk, clone);
 			}
 		}
-		sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
+		sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
 				     IP6CB(skb)->iif);
 	}
 out:
@@ -359,6 +365,7 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 	struct sock *sk;
 	int hash;
 	struct in6_addr *saddr, *daddr;
+	struct net *net;
 
 	hash = nexthdr & (RAW_HTABLE_SIZE - 1);
 
@@ -367,8 +374,9 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 	if (sk != NULL) {
 		saddr = &ipv6_hdr(skb)->saddr;
 		daddr = &ipv6_hdr(skb)->daddr;
+		net = skb->dev->nd_net;
 
-		while ((sk = __raw_v6_lookup(sk, nexthdr, saddr, daddr,
+		while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
 						IP6CB(skb)->iif))) {
 			rawv6_err(sk, skb, NULL, type, code,
 					inner_offset, info);