[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>

3 files changed, 6 insertions, 3 deletions

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 77f630f12806..8b1509bfc695 100644
--- a/include/net/addrconf.h
+++ b/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,
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c4df6cdff650..803caf1a3890 100644
--- a/net/ipv6/addrconf.c
+++ b/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;
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 2df34ed276f1..3cd1c993d52b 100644
--- a/net/ipv6/exthdrs.c
+++ b/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);