ipv6: Pass fib6_result to ip6_mtu_from_fib6 and fib6_mtu

Change ip6_mtu_from_fib6 and fib6_mtu to take a fib6_result over a
fib6_info. Update both to use the fib6_nh from fib6_result.

Since the signature of ip6_mtu_from_fib6 is already changing, add const
to daddr and saddr.

Signed-off-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h
index 5df36d6..0d16b9e 100644
--- a/include/net/ipv6_stubs.h
+++ b/include/net/ipv6_stubs.h
@@ -38,8 +38,9 @@ struct ipv6_stub {
 	void (*fib6_select_path)(const struct net *net, struct fib6_result *res,
 				 struct flowi6 *fl6, int oif, bool oif_match,
 				 const struct sk_buff *skb, int strict);
-	u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
-				 struct in6_addr *saddr);
+	u32 (*ip6_mtu_from_fib6)(const struct fib6_result *res,
+				 const struct in6_addr *daddr,
+				 const struct in6_addr *saddr);
 
 	int (*fib6_nh_init)(struct net *net, struct fib6_nh *fib6_nh,
 			    struct fib6_config *cfg, gfp_t gfp_flags,