From: Julian Anastasov <ja@ssi.bg>
Date: Sun, 10 Jun 2018 23:02:54 +0000 (+0300)
Subject: ipv6: allow PMTU exceptions to local routes
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=0975764684487bf3f7a47eef009e750ea41bd514;p=people%2Fpauldu%2Flinux.git

ipv6: allow PMTU exceptions to local routes

IPVS setups with local client and remote tunnel server need
to create exception for the local virtual IP. What we do is to
change PMTU from 64KB (on "lo") to 1460 in the common case.

Suggested-by: Martin KaFai Lau <kafai@fb.com>
Fixes: 45e4fd26683c ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception")
Fixes: 7343ff31ebf0 ("ipv6: Don't create clones of host routes.")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index fb956989adaf..86a0e4333d42 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2307,9 +2307,6 @@ static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
 	const struct in6_addr *daddr, *saddr;
 	struct rt6_info *rt6 = (struct rt6_info *)dst;
 
-	if (rt6->rt6i_flags & RTF_LOCAL)
-		return;
-
 	if (dst_metric_locked(dst, RTAX_MTU))
 		return;