rtnetlink: Use rtnl_register_many().

We will remove rtnl_register() in favour of rtnl_register_many().

When it succeeds, rtnl_register_many() guarantees all rtnetlink types
in the passed array are supported, and there is no chance that a part
of message types is not supported.

Let's use rtnl_register_many() instead.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20241014201828.91221-3-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: q2ven

net/core/rtnetlink.c

@@ -6843,41 +6843,44 @@ static struct pernet_operations rtnetlink_net_ops = {
 	.exit = rtnetlink_net_exit,
 };
 
+static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst = {
+	{.msgtype = RTM_NEWLINK, .doit = rtnl_newlink},
+	{.msgtype = RTM_DELLINK, .doit = rtnl_dellink},
+	{.msgtype = RTM_GETLINK, .doit = rtnl_getlink,
+	 .dumpit = rtnl_dump_ifinfo, .flags = RTNL_FLAG_DUMP_SPLIT_NLM_DONE},
+	{.msgtype = RTM_SETLINK, .doit = rtnl_setlink},
+	{.msgtype = RTM_GETADDR, .dumpit = rtnl_dump_all},
+	{.msgtype = RTM_GETROUTE, .dumpit = rtnl_dump_all},
+	{.msgtype = RTM_GETNETCONF, .dumpit = rtnl_dump_all},
+	{.msgtype = RTM_GETSTATS, .doit = rtnl_stats_get,
+	 .dumpit = rtnl_stats_dump},
+	{.msgtype = RTM_SETSTATS, .doit = rtnl_stats_set},
+	{.msgtype = RTM_NEWLINKPROP, .doit = rtnl_newlinkprop},
+	{.msgtype = RTM_DELLINKPROP, .doit = rtnl_dellinkprop},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_GETLINK,
+	 .dumpit = rtnl_bridge_getlink},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_DELLINK,
+	 .doit = rtnl_bridge_dellink},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_SETLINK,
+	 .doit = rtnl_bridge_setlink},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_NEWNEIGH, .doit = rtnl_fdb_add},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_DELNEIGH, .doit = rtnl_fdb_del,
+	 .flags = RTNL_FLAG_BULK_DEL_SUPPORTED},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_GETNEIGH, .doit = rtnl_fdb_get,
+	 .dumpit = rtnl_fdb_dump},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_NEWMDB, .doit = rtnl_mdb_add},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_DELMDB, .doit = rtnl_mdb_del,
+	 .flags = RTNL_FLAG_BULK_DEL_SUPPORTED},
+	{.protocol = PF_BRIDGE, .msgtype = RTM_GETMDB, .doit = rtnl_mdb_get,
+	 .dumpit = rtnl_mdb_dump},
+};
+
 void __init rtnetlink_init(void)
 {
 	if (register_pernet_subsys(&rtnetlink_net_ops))
 		panic("rtnetlink_init: cannot initialize rtnetlink\n");
 
 	register_netdevice_notifier(&rtnetlink_dev_notifier);
 
-	rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
-		      rtnl_dump_ifinfo, RTNL_FLAG_DUMP_SPLIT_NLM_DONE);
-	rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, 0);
-	rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, 0);
-	rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, 0);
-
-	rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, 0);
-	rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, 0);
-	rtnl_register(PF_UNSPEC, RTM_GETNETCONF, NULL, rtnl_dump_all, 0);
-
-	rtnl_register(PF_UNSPEC, RTM_NEWLINKPROP, rtnl_newlinkprop, NULL, 0);
-	rtnl_register(PF_UNSPEC, RTM_DELLINKPROP, rtnl_dellinkprop, NULL, 0);
-
-	rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, rtnl_fdb_add, NULL, 0);
-	rtnl_register(PF_BRIDGE, RTM_DELNEIGH, rtnl_fdb_del, NULL,
-		      RTNL_FLAG_BULK_DEL_SUPPORTED);
-	rtnl_register(PF_BRIDGE, RTM_GETNEIGH, rtnl_fdb_get, rtnl_fdb_dump, 0);
-
-	rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, rtnl_bridge_getlink, 0);
-	rtnl_register(PF_BRIDGE, RTM_DELLINK, rtnl_bridge_dellink, NULL, 0);
-	rtnl_register(PF_BRIDGE, RTM_SETLINK, rtnl_bridge_setlink, NULL, 0);
-
-	rtnl_register(PF_UNSPEC, RTM_GETSTATS, rtnl_stats_get, rtnl_stats_dump,
-		      0);
-	rtnl_register(PF_UNSPEC, RTM_SETSTATS, rtnl_stats_set, NULL, 0);
-
-	rtnl_register(PF_BRIDGE, RTM_GETMDB, rtnl_mdb_get, rtnl_mdb_dump, 0);
-	rtnl_register(PF_BRIDGE, RTM_NEWMDB, rtnl_mdb_add, NULL, 0);
-	rtnl_register(PF_BRIDGE, RTM_DELMDB, rtnl_mdb_del, NULL,
-		      RTNL_FLAG_BULK_DEL_SUPPORTED);
+	rtnl_register_many(rtnetlink_rtnl_msg_handlers);
 }