| Message ID | 20150330103439.GL3311@secunet.com |
|---|---|
| State | RFC, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index e4b24c8..e0c6ac9 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1174,7 +1174,8 @@ 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_dst.plen == 128 && + (rt6->rt6i_flags & RTF_CACHE)) { struct net *net = dev_net(dst->dev); rt6->rt6i_flags |= RTF_MODIFIED;
A pmtu update on an uncached route will delete the original route after expiration time is elapsed. As a result, the host is not reachable any more. All routes where pmtu discovery can happen are cached now, so it is ok to refuse pmtu updates on uncached routes. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> --- net/ipv6/route.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)