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 <[email protected]>
Fixes: 45e4fd2 ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception")
Fixes: 7343ff3 ("ipv6: Don't create clones of host routes.")
Signed-off-by: Julian Anastasov <[email protected]>
Acked-by: David Ahern <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Julian Anastasov

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;