[NETNS][IPV6]: inet6_addr - make ipv6_chk_home_addr namespace aware

Looks if the address is belonging to the network namespace, otherwise
discard the address for the check.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/addrconf.h

@@ -65,7 +65,8 @@ extern int			ipv6_chk_addr(struct net *net,
 					      int strict);
 
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
-extern int			ipv6_chk_home_addr(struct in6_addr *addr);
+extern int			ipv6_chk_home_addr(struct net *net,
+						   struct in6_addr *addr);
 #endif
 extern struct inet6_ifaddr      *ipv6_get_ifaddr(struct net *net,
 						 struct in6_addr *addr,

net/ipv6/addrconf.c

@@ -2883,13 +2883,15 @@ void if6_proc_exit(void)
 
 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 /* Check if address is a home address configured on any interface. */
-int ipv6_chk_home_addr(struct in6_addr *addr)
+int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
 {
 	int ret = 0;
 	struct inet6_ifaddr * ifp;
 	u8 hash = ipv6_addr_hash(addr);
 	read_lock_bh(&addrconf_hash_lock);
 	for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
+		if (ifp->idev->dev->nd_net != net)
+			continue;
 		if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
 			ret = 1;

net/ipv6/exthdrs.c

@@ -445,7 +445,7 @@ looped_back:
 			kfree_skb(skb);
 			return -1;
 		}
-		if (!ipv6_chk_home_addr(addr)) {
+		if (!ipv6_chk_home_addr(&init_net, addr)) {
 			IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
 					 IPSTATS_MIB_INADDRERRORS);
 			kfree_skb(skb);