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authorSteffen Klassert <steffen.klassert@secunet.com>2012-10-07 22:47:25 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-08 14:46:34 -0400
commitd851c12b60471188e15e5c8405b289073e8dd025 (patch)
tree102698a4ae2ec89cb931f360cc9229474a6f1cbb /net
parent594f88e96ebaf290e6509b37fff84b310ec1f155 (diff)
ipv4: Always invalidate or update the route on pmtu events
Some protocols, like IPsec still cache routes. So we need to invalidate the old route on pmtu events to avoid the reuse of stale routes. We also need to update the mtu and expire time of the route if we already use a nh exception route, otherwise we ignore newly learned pmtu values after the first expiration. With this patch we always invalidate or update the route on pmtu events. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index ff622069fcef..90ba8358a892 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -904,22 +904,29 @@ out: kfree_skb(skb);
return 0;
}
-static u32 __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
+static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
{
+ struct dst_entry *dst = &rt->dst;
struct fib_result res;
if (mtu < ip_rt_min_pmtu)
mtu = ip_rt_min_pmtu;
+ if (!rt->rt_pmtu) {
+ dst->obsolete = DST_OBSOLETE_KILL;
+ } else {
+ rt->rt_pmtu = mtu;
+ dst->expires = max(1UL, jiffies + ip_rt_mtu_expires);
+ }
+
rcu_read_lock();
- if (fib_lookup(dev_net(rt->dst.dev), fl4, &res) == 0) {
+ if (fib_lookup(dev_net(dst->dev), fl4, &res) == 0) {
struct fib_nh *nh = &FIB_RES_NH(res);
update_or_create_fnhe(nh, fl4->daddr, 0, mtu,
jiffies + ip_rt_mtu_expires);
}
rcu_read_unlock();
- return mtu;
}
static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
@@ -929,14 +936,7 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct flowi4 fl4;
ip_rt_build_flow_key(&fl4, sk, skb);
- mtu = __ip_rt_update_pmtu(rt, &fl4, mtu);
-
- if (!rt->rt_pmtu) {
- dst->obsolete = DST_OBSOLETE_KILL;
- } else {
- rt->rt_pmtu = mtu;
- rt->dst.expires = max(1UL, jiffies + ip_rt_mtu_expires);
- }
+ __ip_rt_update_pmtu(rt, &fl4, mtu);
}
void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,