[RTNETLINK]: Protocol family wildcard dumping for routing rules

Be kind to userspace and don't force them to hardcode protocol
families just to have it changed again once we support routing
rules for more than one protocol family.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/rtnetlink.c

@@ -647,7 +647,8 @@ static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
 	[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
 	[RTM_NEWNEIGH - RTM_BASE] = { .doit   = neigh_add	      },
 	[RTM_DELNEIGH - RTM_BASE] = { .doit   = neigh_delete	      },
-	[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info	      }
+	[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info	      },
+	[RTM_GETRULE  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    }
 };
 
 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)