1 files changed, 19 insertions, 3 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c8bc9b4ac328..6f01fe122abd 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -404,6 +404,14 @@ static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
         }
 }
 
+static bool __rt6_check_expired(const struct rt6_info *rt)
+{
+        if (rt->rt6i_flags & RTF_EXPIRES)
+                return time_after(jiffies, rt->dst.expires);
+        else
+                return false;
+}
+
 static bool rt6_check_expired(const struct rt6_info *rt)
 {
         if (rt->rt6i_flags & RTF_EXPIRES) {
@@ -1252,7 +1260,8 @@ static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
 
 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
 {
-        if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
+        if (!__rt6_check_expired(rt) &&
+            rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
             rt6_check((struct rt6_info *)(rt->dst.from), cookie))
                 return &rt->dst;
         else
@@ -1272,7 +1281,8 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
 
         rt6_dst_from_metrics_check(rt);
 
-        if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
+        if (rt->rt6i_flags & RTF_PCPU ||
+            (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
                 return rt6_dst_from_check(rt, cookie);
         else
                 return rt6_check(rt, cookie);
@@ -1322,6 +1332,12 @@ static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
         rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
 }
 
+static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
+{
+        return !(rt->rt6i_flags & RTF_CACHE) &&
+                (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
+}
+
 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
                                  const struct ipv6hdr *iph, u32 mtu)
 {
@@ -1335,7 +1351,7 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
         if (mtu >= dst_mtu(dst))
                 return;
 
-        if (rt6->rt6i_flags & RTF_CACHE) {
+        if (!rt6_cache_allowed_for_pmtu(rt6)) {
                 rt6_do_update_pmtu(rt6, mtu);
         } else {
                 const struct in6_addr *daddr, *saddr;