ipv4: Update MTU to all related cache entries in ip_rt_frag_needed()

Add struct net_device parameter to ip_rt_frag_needed() and update MTU to
cache entries where ifindex is specified. This is similar to what is
already done in ip_rt_redirect().

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 24 insertions, 17 deletions

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index c67d00e8c600..87397351ddac 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -691,7 +691,8 @@ static void icmp_unreach(struct sk_buff *skb)
 					       NIPQUAD(iph->daddr));
 			} else {
 				info = ip_rt_frag_needed(net, iph,
-						     ntohs(icmph->un.frag.mtu));
+							 ntohs(icmph->un.frag.mtu),
+							 skb->dev);
 				if (!info)
 					goto out;
 			}
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ce25a13f3430..5e3685c5c407 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1430,11 +1430,13 @@ static inline unsigned short guess_mtu(unsigned short old_mtu)
 }
 
 unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
-				 unsigned short new_mtu)
+				 unsigned short new_mtu,
+				 struct net_device *dev)
 {
-	int i;
+	int i, k;
 	unsigned short old_mtu = ntohs(iph->tot_len);
 	struct rtable *rth;
+	int  ikeys[2] = { dev->ifindex, 0 };
 	__be32  skeys[2] = { iph->saddr, 0, };
 	__be32  daddr = iph->daddr;
 	unsigned short est_mtu = 0;
@@ -1442,22 +1444,26 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
 	if (ipv4_config.no_pmtu_disc)
 		return 0;
 
-	for (i = 0; i < 2; i++) {
-		unsigned hash = rt_hash(daddr, skeys[i], 0);
+	for (k = 0; k < 2; k++) {
+		for (i = 0; i < 2; i++) {
+			unsigned hash = rt_hash(daddr, skeys[i], ikeys[k]);
 
-		rcu_read_lock();
-		for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
-		     rth = rcu_dereference(rth->u.dst.rt_next)) {
-			if (rth->fl.fl4_dst == daddr &&
-			    rth->fl.fl4_src == skeys[i] &&
-			    rth->rt_dst  == daddr &&
-			    rth->rt_src  == iph->saddr &&
-			    rth->fl.iif == 0 &&
-			    !(dst_metric_locked(&rth->u.dst, RTAX_MTU)) &&
-			    net_eq(dev_net(rth->u.dst.dev), net) &&
-			    rth->rt_genid == atomic_read(&rt_genid)) {
+			rcu_read_lock();
+			for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
+			     rth = rcu_dereference(rth->u.dst.rt_next)) {
 				unsigned short mtu = new_mtu;
 
+				if (rth->fl.fl4_dst != daddr ||
+				    rth->fl.fl4_src != skeys[i] ||
+				    rth->rt_dst != daddr ||
+				    rth->rt_src != iph->saddr ||
+				    rth->fl.oif != ikeys[k] ||
+				    rth->fl.iif != 0 ||
+				    dst_metric_locked(&rth->u.dst, RTAX_MTU) ||
+				    !net_eq(dev_net(rth->u.dst.dev), net) ||
+				    rth->rt_genid != atomic_read(&rt_genid))
+					continue;
+
 				if (new_mtu < 68 || new_mtu >= old_mtu) {
 
 					/* BSD 4.2 compatibility hack :-( */
@@ -1483,8 +1489,8 @@ unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph,
 					est_mtu = mtu;
 				}
 			}
+			rcu_read_unlock();
 		}
-		rcu_read_unlock();
 	}
 	return est_mtu ? : new_mtu;
 }