3 files changed, 18 insertions, 7 deletions

diff --git a/include/net/route.h b/include/net/route.h
index 1985d820edea..4eabf008413b 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -115,7 +115,7 @@ extern int		__ip_route_output_key(struct net *, struct rtable **, const struct f
 extern int              ip_route_output_key(struct net *, struct rtable **, struct flowi *flp);
 extern int              ip_route_output_flow(struct net *, struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
 extern int              ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
-extern unsigned short   ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
+extern unsigned short   ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu);
 extern void             ip_rt_send_redirect(struct sk_buff *skb);
 
 extern unsigned         inet_addr_type(struct net *net, __be32 addr);
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index a142f19fec45..63ffc7d86f98 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -696,7 +696,7 @@ static void icmp_unreach(struct sk_buff *skb)
                                                          "and DF set.\n",
                                                NIPQUAD(iph->daddr));
                         } else {
-                                info = ip_rt_frag_needed(iph,
+                                info = ip_rt_frag_needed(&init_net, iph,
                                                      ntohs(icmph->un.frag.mtu));
                                 if (!info)
                                         goto out;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 39a40342142f..896c768e41a2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -648,6 +648,11 @@ static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
                 (fl1->iif ^ fl2->iif)) == 0;
 }
 
+static inline int compare_netns(struct rtable *rt1, struct rtable *rt2)
+{
+        return rt1->u.dst.dev->nd_net == rt2->u.dst.dev->nd_net;
+}
+
 /*
  * Perform a full scan of hash table and free all entries.
  * Can be called by a softirq or a process.
@@ -961,7 +966,7 @@ restart:
 
         spin_lock_bh(rt_hash_lock_addr(hash));
         while ((rth = *rthp) != NULL) {
-                if (compare_keys(&rth->fl, &rt->fl)) {
+                if (compare_keys(&rth->fl, &rt->fl) && compare_netns(rth, rt)) {
                         /* Put it first */
                         *rthp = rth->u.dst.rt_next;
                         /*
@@ -1415,7 +1420,8 @@ static __inline__ unsigned short guess_mtu(unsigned short old_mtu)
         return 68;
 }
 
-unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu)
+unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
+                                 unsigned short new_mtu)
 {
         int i;
         unsigned short old_mtu = ntohs(iph->tot_len);
@@ -1438,7 +1444,8 @@ unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu)
                             rth->rt_dst  == daddr &&
                             rth->rt_src  == iph->saddr &&
                             rth->fl.iif == 0 &&
-                            !(dst_metric_locked(&rth->u.dst, RTAX_MTU))) {
+                            !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) &&
+                            rth->u.dst.dev->nd_net == net) {
                                 unsigned short mtu = new_mtu;
 
                                 if (new_mtu < 68 || new_mtu >= old_mtu) {
@@ -2049,7 +2056,9 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         struct rtable * rth;
         unsigned        hash;
         int iif = dev->ifindex;
+        struct net *net;
 
+        net = skb->dev->nd_net;
         tos &= IPTOS_RT_MASK;
         hash = rt_hash(daddr, saddr, iif);
 
@@ -2061,7 +2070,8 @@ int ip_route_input(struct sk_buff *skb, __be32 daddr, __be32 saddr,
                     rth->fl.iif == iif &&
                     rth->fl.oif == 0 &&
                     rth->fl.mark == skb->mark &&
-                    rth->fl.fl4_tos == tos) {
+                    rth->fl.fl4_tos == tos &&
+                    rth->u.dst.dev->nd_net == net) {
                         dst_use(&rth->u.dst, jiffies);
                         RT_CACHE_STAT_INC(in_hit);
                         rcu_read_unlock();
@@ -2460,7 +2470,8 @@ int __ip_route_output_key(struct net *net, struct rtable **rp,
                     rth->fl.oif == flp->oif &&
                     rth->fl.mark == flp->mark &&
                     !((rth->fl.fl4_tos ^ flp->fl4_tos) &
-                            (IPTOS_RT_MASK | RTO_ONLINK))) {
+                            (IPTOS_RT_MASK | RTO_ONLINK)) &&
+                    rth->u.dst.dev->nd_net == net) {
                         dst_use(&rth->u.dst, jiffies);
                         RT_CACHE_STAT_INC(out_hit);
                         rcu_read_unlock_bh();