1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* Copyright Amazon.com Inc. or its affiliates. */
  3
  4#include <linux/init.h>
  5#include <linux/netdevice.h>
  6#include <linux/notifier.h>
  7#include <linux/rtnetlink.h>
  8#include <net/net_namespace.h>
  9#include <net/netns/generic.h>
 10
 11static int rtnl_net_debug_event(struct notifier_block *nb,
 12				unsigned long event, void *ptr)
 13{
 14	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 15	struct net *net = dev_net(dev);
 16	enum netdev_cmd cmd = event;
 17
 18	/* Keep enum and don't add default to trigger -Werror=switch */
 19	switch (cmd) {
 20	case NETDEV_UP:
 21	case NETDEV_DOWN:
 22	case NETDEV_REBOOT:
 23	case NETDEV_CHANGE:
 24	case NETDEV_REGISTER:
 25	case NETDEV_UNREGISTER:
 26	case NETDEV_CHANGEMTU:
 27	case NETDEV_CHANGEADDR:
 28	case NETDEV_PRE_CHANGEADDR:
 29	case NETDEV_GOING_DOWN:
 30	case NETDEV_CHANGENAME:
 31	case NETDEV_FEAT_CHANGE:
 32	case NETDEV_BONDING_FAILOVER:
 33	case NETDEV_PRE_UP:
 34	case NETDEV_PRE_TYPE_CHANGE:
 35	case NETDEV_POST_TYPE_CHANGE:
 36	case NETDEV_POST_INIT:
 37	case NETDEV_PRE_UNINIT:
 38	case NETDEV_RELEASE:
 39	case NETDEV_NOTIFY_PEERS:
 40	case NETDEV_JOIN:
 41	case NETDEV_CHANGEUPPER:
 42	case NETDEV_RESEND_IGMP:
 43	case NETDEV_PRECHANGEMTU:
 44	case NETDEV_CHANGEINFODATA:
 45	case NETDEV_BONDING_INFO:
 46	case NETDEV_PRECHANGEUPPER:
 47	case NETDEV_CHANGELOWERSTATE:
 48	case NETDEV_UDP_TUNNEL_PUSH_INFO:
 49	case NETDEV_UDP_TUNNEL_DROP_INFO:
 50	case NETDEV_CHANGE_TX_QUEUE_LEN:
 51	case NETDEV_CVLAN_FILTER_PUSH_INFO:
 52	case NETDEV_CVLAN_FILTER_DROP_INFO:
 53	case NETDEV_SVLAN_FILTER_PUSH_INFO:
 54	case NETDEV_SVLAN_FILTER_DROP_INFO:
 55	case NETDEV_OFFLOAD_XSTATS_ENABLE:
 56	case NETDEV_OFFLOAD_XSTATS_DISABLE:
 57	case NETDEV_OFFLOAD_XSTATS_REPORT_USED:
 58	case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:
 59	case NETDEV_XDP_FEAT_CHANGE:
 60		ASSERT_RTNL();
 61		break;
 62
 63	/* Once an event fully supports RTNL_NET, move it here
 64	 * and remove "if (0)" below.
 65	 *
 66	 * case NETDEV_XXX:
 67	 *	ASSERT_RTNL_NET(net);
 68	 *	break;
 69	 */
 70	}
 71
 72	/* Just to avoid unused-variable error for dev and net. */
 73	if (0)
 74		ASSERT_RTNL_NET(net);
 75
 76	return NOTIFY_DONE;
 77}
 78
 79static int rtnl_net_debug_net_id;
 80
 81static int __net_init rtnl_net_debug_net_init(struct net *net)
 82{
 83	struct notifier_block *nb;
 84
 85	nb = net_generic(net, rtnl_net_debug_net_id);
 86	nb->notifier_call = rtnl_net_debug_event;
 87
 88	return register_netdevice_notifier_net(net, nb);
 89}
 90
 91static void __net_exit rtnl_net_debug_net_exit(struct net *net)
 92{
 93	struct notifier_block *nb;
 94
 95	nb = net_generic(net, rtnl_net_debug_net_id);
 96	unregister_netdevice_notifier_net(net, nb);
 97}
 98
 99static struct pernet_operations rtnl_net_debug_net_ops __net_initdata = {
100	.init = rtnl_net_debug_net_init,
101	.exit = rtnl_net_debug_net_exit,
102	.id = &rtnl_net_debug_net_id,
103	.size = sizeof(struct notifier_block),
104};
105
106static struct notifier_block rtnl_net_debug_block = {
107	.notifier_call = rtnl_net_debug_event,
108};
109
110static int __init rtnl_net_debug_init(void)
111{
112	int ret;
113
114	ret = register_pernet_device(&rtnl_net_debug_net_ops);
115	if (ret)
116		return ret;
117
118	ret = register_netdevice_notifier(&rtnl_net_debug_block);
119	if (ret)
120		unregister_pernet_subsys(&rtnl_net_debug_net_ops);
121
122	return ret;
123}
124
125subsys_initcall(rtnl_net_debug_init);