lock_debug.c

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