ipv6: Stop /128 route from disappearing after pmtu update

This patch is mostly from Steffen Klassert <steffen.klassert@secunet.com>.
I only removed the (rt6->rt6i_dst.plen == 128) check from
ip6_rt_update_pmtu() because the (rt6->rt6i_flags & RTF_CACHE) test
has already implied it.

This patch:
1. Create RTF_CACHE route for /128 non local route
2. After (1), all routes that allow pmtu update should have a RTF_CACHE
   clone.  Hence, stop updating MTU for any non RTF_CACHE route.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 07562a2..aa4cfdd 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -977,7 +977,7 @@ redo_rt6_select:
 
        if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
                nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
-       else if (!(rt->dst.flags & DST_HOST))
+       else if (!(rt->dst.flags & DST_HOST) || !(rt->dst.flags & RTF_LOCAL))
                nrt = rt6_alloc_clone(rt, &fl6->daddr);
        else
                goto out2;
@@ -1172,7 +1172,7 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
        struct rt6_info *rt6 = (struct rt6_info *)dst;
 
        dst_confirm(dst);
-       if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
+       if (mtu < dst_mtu(dst) && (rt6->rt6i_flags & RTF_CACHE)) {
                struct net *net = dev_net(dst->dev);
 
                rt6->rt6i_flags |= RTF_MODIFIED;