ipv6: allow PMTU exceptions to local routes

BugLink: http://bugs.launchpad.net/bugs/1800537
[ 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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 89466c2c290e2b42000228c8d18e59610a1259ec..d24c70fd216ad6fc838fee8d49661789ee71753a 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2078,9 +2078,6 @@ 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;