[PATCH 4.14 03/52] ipv6: allow PMTU exceptions to local routes

Greg Kroah-Hartman
2018-06-24T15:25:13Z

From: Julian Anastasov <ja@ssi.bg>

[ Upstream commit 0975764684487bf3f7a47eef009e750ea41bd514 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv6/route.c | 3 ---
1 file changed, 3 deletions(-)

--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1476,9 +1476,6 @@ static void __ip6_rt_update_pmtu(struct
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;