ipv6: Notify route if replacing currently offloaded one

Similar to the corresponding IPv4 patch, only notify the new route if it
is replacing the currently offloaded one. Meaning, the one pointed to by
'fn->leaf'.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Reviewed-by: NJiri Pirko <jiri@mellanox.com>
Reviewed-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

@@ -1231,6 +1231,13 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
 		}
 
 		if (!info->skip_notify_kernel) {
+			enum fib_event_type fib_event;
+
+			fib_event = FIB_EVENT_ENTRY_REPLACE_TMP;
+			if (ins == &fn->leaf)
+				err = call_fib6_entry_notifiers(info->nl_net,
+								fib_event, rt,
+								extack);
 			err = call_fib6_entry_notifiers(info->nl_net,
 							FIB_EVENT_ENTRY_REPLACE,
 							rt, extack);