xref: /linux/net/core/rtnl_net_debug.c (revision e814f3fd16acfb7f9966773953de8f740a1e3202) 
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 
11 static 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_FEAT_CHANGE:
31 	case NETDEV_BONDING_FAILOVER:
32 	case NETDEV_PRE_UP:
33 	case NETDEV_PRE_TYPE_CHANGE:
34 	case NETDEV_POST_TYPE_CHANGE:
35 	case NETDEV_POST_INIT:
36 	case NETDEV_PRE_UNINIT:
37 	case NETDEV_RELEASE:
38 	case NETDEV_NOTIFY_PEERS:
39 	case NETDEV_JOIN:
40 	case NETDEV_CHANGEUPPER:
41 	case NETDEV_RESEND_IGMP:
42 	case NETDEV_PRECHANGEMTU:
43 	case NETDEV_CHANGEINFODATA:
44 	case NETDEV_BONDING_INFO:
45 	case NETDEV_PRECHANGEUPPER:
46 	case NETDEV_CHANGELOWERSTATE:
47 	case NETDEV_UDP_TUNNEL_PUSH_INFO:
48 	case NETDEV_UDP_TUNNEL_DROP_INFO:
49 	case NETDEV_CHANGE_TX_QUEUE_LEN:
50 	case NETDEV_CVLAN_FILTER_PUSH_INFO:
51 	case NETDEV_CVLAN_FILTER_DROP_INFO:
52 	case NETDEV_SVLAN_FILTER_PUSH_INFO:
53 	case NETDEV_SVLAN_FILTER_DROP_INFO:
54 	case NETDEV_OFFLOAD_XSTATS_ENABLE:
55 	case NETDEV_OFFLOAD_XSTATS_DISABLE:
56 	case NETDEV_OFFLOAD_XSTATS_REPORT_USED:
57 	case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:
58 	case NETDEV_XDP_FEAT_CHANGE:
59 		ASSERT_RTNL();
60 		break;
61 
62 	case NETDEV_CHANGENAME:
63 		ASSERT_RTNL_NET(net);
64 		break;
65 	}
66 
67 	return NOTIFY_DONE;
68 }
69 
70 static int rtnl_net_debug_net_id;
71 
72 static int __net_init rtnl_net_debug_net_init(struct net *net)
73 {
74 	struct notifier_block *nb;
75 
76 	nb = net_generic(net, rtnl_net_debug_net_id);
77 	nb->notifier_call = rtnl_net_debug_event;
78 
79 	return register_netdevice_notifier_net(net, nb);
80 }
81 
82 static void __net_exit rtnl_net_debug_net_exit(struct net *net)
83 {
84 	struct notifier_block *nb;
85 
86 	nb = net_generic(net, rtnl_net_debug_net_id);
87 	unregister_netdevice_notifier_net(net, nb);
88 }
89 
90 static struct pernet_operations rtnl_net_debug_net_ops __net_initdata = {
91 	.init = rtnl_net_debug_net_init,
92 	.exit = rtnl_net_debug_net_exit,
93 	.id = &rtnl_net_debug_net_id,
94 	.size = sizeof(struct notifier_block),
95 };
96 
97 static struct notifier_block rtnl_net_debug_block = {
98 	.notifier_call = rtnl_net_debug_event,
99 };
100 
101 static int __init rtnl_net_debug_init(void)
102 {
103 	int ret;
104 
105 	ret = register_pernet_device(&rtnl_net_debug_net_ops);
106 	if (ret)
107 		return ret;
108 
109 	ret = register_netdevice_notifier(&rtnl_net_debug_block);
110 	if (ret)
111 		unregister_pernet_subsys(&rtnl_net_debug_net_ops);
112 
113 	return ret;
114 }
115 
116 subsys_initcall(rtnl_net_debug_init);
117