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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/net/core/lock_debug.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/* Copyright Amazon.com Inc. or its affiliates. */

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#include <linux/init.h>

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#include <linux/netdevice.h>

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#include <linux/notifier.h>

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#include <linux/rtnetlink.h>

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#include <net/net_namespace.h>

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#include <net/netdev_lock.h>

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#include <net/netns/generic.h>

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int netdev_debug_event(struct notifier_block *nb, unsigned long event,

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		       void *ptr)

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{

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	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

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	struct net *net = dev_net(dev);

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	enum netdev_cmd cmd = event;

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	/* Keep enum and don't add default to trigger -Werror=switch */

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	switch (cmd) {

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	case NETDEV_XDP_FEAT_CHANGE:

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		netdev_assert_locked(dev);

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		fallthrough;

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	case NETDEV_CHANGE:

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	case NETDEV_REGISTER:

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	case NETDEV_UP:

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		netdev_ops_assert_locked(dev);

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		fallthrough;

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	case NETDEV_DOWN:

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	case NETDEV_REBOOT:

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	case NETDEV_UNREGISTER:

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	case NETDEV_CHANGEMTU:

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	case NETDEV_CHANGEADDR:

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	case NETDEV_PRE_CHANGEADDR:

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	case NETDEV_GOING_DOWN:

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	case NETDEV_FEAT_CHANGE:

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	case NETDEV_BONDING_FAILOVER:

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	case NETDEV_PRE_UP:

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	case NETDEV_PRE_TYPE_CHANGE:

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	case NETDEV_POST_TYPE_CHANGE:

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	case NETDEV_POST_INIT:

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	case NETDEV_PRE_UNINIT:

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	case NETDEV_RELEASE:

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	case NETDEV_NOTIFY_PEERS:

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	case NETDEV_JOIN:

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	case NETDEV_CHANGEUPPER:

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	case NETDEV_RESEND_IGMP:

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	case NETDEV_PRECHANGEMTU:

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	case NETDEV_CHANGEINFODATA:

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	case NETDEV_BONDING_INFO:

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	case NETDEV_PRECHANGEUPPER:

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	case NETDEV_CHANGELOWERSTATE:

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	case NETDEV_UDP_TUNNEL_PUSH_INFO:

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	case NETDEV_UDP_TUNNEL_DROP_INFO:

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	case NETDEV_CHANGE_TX_QUEUE_LEN:

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	case NETDEV_CVLAN_FILTER_PUSH_INFO:

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	case NETDEV_CVLAN_FILTER_DROP_INFO:

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	case NETDEV_SVLAN_FILTER_PUSH_INFO:

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	case NETDEV_SVLAN_FILTER_DROP_INFO:

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	case NETDEV_OFFLOAD_XSTATS_ENABLE:

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	case NETDEV_OFFLOAD_XSTATS_DISABLE:

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	case NETDEV_OFFLOAD_XSTATS_REPORT_USED:

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	case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:

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		ASSERT_RTNL();

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		break;

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	case NETDEV_CHANGENAME:

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		ASSERT_RTNL_NET(net);

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		break;

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	}

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	return NOTIFY_DONE;

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}

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EXPORT_SYMBOL_NS_GPL(netdev_debug_event, "NETDEV_INTERNAL");

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static int rtnl_net_debug_net_id;

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static int __net_init rtnl_net_debug_net_init(struct net *net)

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{

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	struct notifier_block *nb;

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	nb = net_generic(net, rtnl_net_debug_net_id);

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	nb->notifier_call = netdev_debug_event;

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	return register_netdevice_notifier_net(net, nb);

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}

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static void __net_exit rtnl_net_debug_net_exit(struct net *net)

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{

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	struct notifier_block *nb;

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	nb = net_generic(net, rtnl_net_debug_net_id);

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	unregister_netdevice_notifier_net(net, nb);

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}

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static struct pernet_operations rtnl_net_debug_net_ops __net_initdata = {

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	.init = rtnl_net_debug_net_init,

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	.exit = rtnl_net_debug_net_exit,

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	.id = &rtnl_net_debug_net_id,

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	.size = sizeof(struct notifier_block),

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};

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static struct notifier_block rtnl_net_debug_block = {

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	.notifier_call = netdev_debug_event,

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};

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static int __init rtnl_net_debug_init(void)

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{

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	int ret;

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	ret = register_pernet_subsys(&rtnl_net_debug_net_ops);

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	if (ret)

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		return ret;

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	ret = register_netdevice_notifier(&rtnl_net_debug_block);

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	if (ret)

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		unregister_pernet_subsys(&rtnl_net_debug_net_ops);

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	return ret;

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}

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subsys_initcall(rtnl_net_debug_init);

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