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
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -977,7 +977,7 @@
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 @@
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;