net/core/rtnl_net_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/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_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
  79 static int rtnl_net_debug_net_id;
  80
  81 static 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
  91 static 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
  99 static 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
 106 static struct notifier_block rtnl_net_debug_block = {
 107         .notifier_call = rtnl_net_debug_event,
 108 };
 109
 110 static 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
 125 subsys_initcall(rtnl_net_debug_init);