ipv4: Perform peer validation on cached route lookup.
Otherwise we won't notice the peer GENID change.
Reported-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 57e01bc..ca5e237 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1693,12 +1693,8 @@
}
-static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
+static struct rtable *ipv4_validate_peer(struct rtable *rt)
{
- struct rtable *rt = (struct rtable *) dst;
-
- if (rt_is_expired(rt))
- return NULL;
if (rt->rt_peer_genid != rt_peer_genid()) {
struct inet_peer *peer;
@@ -1707,19 +1703,29 @@
peer = rt->peer;
if (peer) {
- check_peer_pmtu(dst, peer);
+ check_peer_pmtu(&rt->dst, peer);
if (peer->redirect_genid != redirect_genid)
peer->redirect_learned.a4 = 0;
if (peer->redirect_learned.a4 &&
peer->redirect_learned.a4 != rt->rt_gateway) {
- if (check_peer_redir(dst, peer))
+ if (check_peer_redir(&rt->dst, peer))
return NULL;
}
}
rt->rt_peer_genid = rt_peer_genid();
}
+ return rt;
+}
+
+static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
+{
+ struct rtable *rt = (struct rtable *) dst;
+
+ if (rt_is_expired(rt))
+ return NULL;
+ dst = (struct dst_entry *) ipv4_validate_peer(rt);
return dst;
}
@@ -2374,6 +2380,9 @@
rth->rt_mark == skb->mark &&
net_eq(dev_net(rth->dst.dev), net) &&
!rt_is_expired(rth)) {
+ rth = ipv4_validate_peer(rth);
+ if (!rth)
+ continue;
if (noref) {
dst_use_noref(&rth->dst, jiffies);
skb_dst_set_noref(skb, &rth->dst);
@@ -2749,6 +2758,9 @@
(IPTOS_RT_MASK | RTO_ONLINK)) &&
net_eq(dev_net(rth->dst.dev), net) &&
!rt_is_expired(rth)) {
+ rth = ipv4_validate_peer(rth);
+ if (!rth)
+ continue;
dst_use(&rth->dst, jiffies);
RT_CACHE_STAT_INC(out_hit);
rcu_read_unlock_bh();