xref: /linux/net/core/lock_debug.c (revision ab59a8605604f71bbbc16077270dc3f39648b7fc) 
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 
12 int 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_REGISTER:
22 	case NETDEV_UP:
23 	case NETDEV_CHANGE:
24 		netdev_ops_assert_locked(dev);
25 		fallthrough;
26 	case NETDEV_DOWN:
27 	case NETDEV_REBOOT:
28 	case NETDEV_UNREGISTER:
29 	case NETDEV_CHANGEMTU:
30 	case NETDEV_CHANGEADDR:
31 	case NETDEV_PRE_CHANGEADDR:
32 	case NETDEV_GOING_DOWN:
33 	case NETDEV_FEAT_CHANGE:
34 	case NETDEV_BONDING_FAILOVER:
35 	case NETDEV_PRE_UP:
36 	case NETDEV_PRE_TYPE_CHANGE:
37 	case NETDEV_POST_TYPE_CHANGE:
38 	case NETDEV_POST_INIT:
39 	case NETDEV_PRE_UNINIT:
40 	case NETDEV_RELEASE:
41 	case NETDEV_NOTIFY_PEERS:
42 	case NETDEV_JOIN:
43 	case NETDEV_CHANGEUPPER:
44 	case NETDEV_RESEND_IGMP:
45 	case NETDEV_PRECHANGEMTU:
46 	case NETDEV_CHANGEINFODATA:
47 	case NETDEV_BONDING_INFO:
48 	case NETDEV_PRECHANGEUPPER:
49 	case NETDEV_CHANGELOWERSTATE:
50 	case NETDEV_UDP_TUNNEL_PUSH_INFO:
51 	case NETDEV_UDP_TUNNEL_DROP_INFO:
52 	case NETDEV_CHANGE_TX_QUEUE_LEN:
53 	case NETDEV_CVLAN_FILTER_PUSH_INFO:
54 	case NETDEV_CVLAN_FILTER_DROP_INFO:
55 	case NETDEV_SVLAN_FILTER_PUSH_INFO:
56 	case NETDEV_SVLAN_FILTER_DROP_INFO:
57 	case NETDEV_OFFLOAD_XSTATS_ENABLE:
58 	case NETDEV_OFFLOAD_XSTATS_DISABLE:
59 	case NETDEV_OFFLOAD_XSTATS_REPORT_USED:
60 	case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:
61 	case NETDEV_XDP_FEAT_CHANGE:
62 		ASSERT_RTNL();
63 		break;
64 
65 	case NETDEV_CHANGENAME:
66 		ASSERT_RTNL_NET(net);
67 		break;
68 	}
69 
70 	return NOTIFY_DONE;
71 }
72 EXPORT_SYMBOL_NS_GPL(netdev_debug_event, "NETDEV_INTERNAL");
73 
74 static int rtnl_net_debug_net_id;
75 
76 static int __net_init rtnl_net_debug_net_init(struct net *net)
77 {
78 	struct notifier_block *nb;
79 
80 	nb = net_generic(net, rtnl_net_debug_net_id);
81 	nb->notifier_call = netdev_debug_event;
82 
83 	return register_netdevice_notifier_net(net, nb);
84 }
85 
86 static void __net_exit rtnl_net_debug_net_exit(struct net *net)
87 {
88 	struct notifier_block *nb;
89 
90 	nb = net_generic(net, rtnl_net_debug_net_id);
91 	unregister_netdevice_notifier_net(net, nb);
92 }
93 
94 static struct pernet_operations rtnl_net_debug_net_ops __net_initdata = {
95 	.init = rtnl_net_debug_net_init,
96 	.exit = rtnl_net_debug_net_exit,
97 	.id = &rtnl_net_debug_net_id,
98 	.size = sizeof(struct notifier_block),
99 };
100 
101 static struct notifier_block rtnl_net_debug_block = {
102 	.notifier_call = netdev_debug_event,
103 };
104 
105 static int __init rtnl_net_debug_init(void)
106 {
107 	int ret;
108 
109 	ret = register_pernet_subsys(&rtnl_net_debug_net_ops);
110 	if (ret)
111 		return ret;
112 
113 	ret = register_netdevice_notifier(&rtnl_net_debug_block);
114 	if (ret)
115 		unregister_pernet_subsys(&rtnl_net_debug_net_ops);
116 
117 	return ret;
118 }
119 
120 subsys_initcall(rtnl_net_debug_init);
121