core.c 26.9 KB
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/*
 * This is the linux wireless configuration interface.
 *
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 * Copyright 2006-2010		Johannes Berg <johannes@sipsolutions.net>
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 */

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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/sched.h>
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#include <net/genetlink.h>
#include <net/cfg80211.h>
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#include "nl80211.h"
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#include "core.h"
#include "sysfs.h"
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#include "debugfs.h"
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#include "wext-compat.h"
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#include "ethtool.h"
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/* name for sysfs, %d is appended */
#define PHY_NAME "phy"

MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");

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/* RCU-protected (and cfg80211_mutex for writers) */
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LIST_HEAD(cfg80211_rdev_list);
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int cfg80211_rdev_list_generation;
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DEFINE_MUTEX(cfg80211_mutex);
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/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;

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/* for the cleanup, scan and event works */
struct workqueue_struct *cfg80211_wq;

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static bool cfg80211_disable_40mhz_24ghz;
module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
		 "Disable 40MHz support in the 2.4GHz band");

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/* requires cfg80211_mutex to be held! */
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struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
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{
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	struct cfg80211_registered_device *result = NULL, *rdev;
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	if (!wiphy_idx_valid(wiphy_idx))
		return NULL;

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	assert_cfg80211_lock();

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	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (rdev->wiphy_idx == wiphy_idx) {
			result = rdev;
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			break;
		}
	}

	return result;
}

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int get_wiphy_idx(struct wiphy *wiphy)
{
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	struct cfg80211_registered_device *rdev;
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	if (!wiphy)
		return WIPHY_IDX_STALE;
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	rdev = wiphy_to_dev(wiphy);
	return rdev->wiphy_idx;
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}

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/* requires cfg80211_rdev_mutex to be held! */
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struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
{
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	struct cfg80211_registered_device *rdev;
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	if (!wiphy_idx_valid(wiphy_idx))
		return NULL;

	assert_cfg80211_lock();

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	rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
	if (!rdev)
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		return NULL;
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	return &rdev->wiphy;
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}

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struct cfg80211_registered_device *
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cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
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{
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	struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
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	struct net_device *dev;

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	mutex_lock(&cfg80211_mutex);
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	dev = dev_get_by_index(net, ifindex);
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	if (!dev)
		goto out;
	if (dev->ieee80211_ptr) {
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		rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
		mutex_lock(&rdev->mtx);
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	} else
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		rdev = ERR_PTR(-ENODEV);
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	dev_put(dev);
 out:
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	mutex_unlock(&cfg80211_mutex);
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	return rdev;
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}

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/* requires cfg80211_mutex to be held */
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int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
			char *newname)
{
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	struct cfg80211_registered_device *rdev2;
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	int wiphy_idx, taken = -1, result, digits;
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	assert_cfg80211_lock();
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	/* prohibit calling the thing phy%d when %d is not its number */
	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
		/* count number of places needed to print wiphy_idx */
		digits = 1;
		while (wiphy_idx /= 10)
			digits++;
		/*
		 * deny the name if it is phy<idx> where <idx> is printed
		 * without leading zeroes. taken == strlen(newname) here
		 */
		if (taken == strlen(PHY_NAME) + digits)
			return -EINVAL;
	}


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	/* Ignore nop renames */
	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
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		return 0;
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	/* Ensure another device does not already have this name. */
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	list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
		if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
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			return -EINVAL;
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	result = device_rename(&rdev->wiphy.dev, newname);
	if (result)
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		return result;
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	if (rdev->wiphy.debugfsdir &&
	    !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
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			    rdev->wiphy.debugfsdir,
			    rdev->wiphy.debugfsdir->d_parent,
			    newname))
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		pr_err("failed to rename debugfs dir to %s!\n", newname);
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	nl80211_notify_dev_rename(rdev);
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	return 0;
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}

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int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
			  struct net *net)
{
	struct wireless_dev *wdev;
	int err = 0;

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	if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
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		return -EOPNOTSUPP;

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	list_for_each_entry(wdev, &rdev->wdev_list, list) {
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		if (!wdev->netdev)
			continue;
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		wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
		err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
		if (err)
			break;
		wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
	}

	if (err) {
		/* failed -- clean up to old netns */
		net = wiphy_net(&rdev->wiphy);

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		list_for_each_entry_continue_reverse(wdev, &rdev->wdev_list,
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						     list) {
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			if (!wdev->netdev)
				continue;
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			wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
			err = dev_change_net_namespace(wdev->netdev, net,
							"wlan%d");
			WARN_ON(err);
			wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
		}
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		return err;
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	}

	wiphy_net_set(&rdev->wiphy, net);

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	err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
	WARN_ON(err);

	return 0;
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}

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static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
{
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	struct cfg80211_registered_device *rdev = data;
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	rdev->ops->rfkill_poll(&rdev->wiphy);
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}

static int cfg80211_rfkill_set_block(void *data, bool blocked)
{
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	struct cfg80211_registered_device *rdev = data;
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	struct wireless_dev *wdev;

	if (!blocked)
		return 0;

	rtnl_lock();
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	mutex_lock(&rdev->devlist_mtx);
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	list_for_each_entry(wdev, &rdev->wdev_list, list) {
		if (wdev->netdev) {
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			dev_close(wdev->netdev);
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			continue;
		}
		/* otherwise, check iftype */
		switch (wdev->iftype) {
		case NL80211_IFTYPE_P2P_DEVICE:
			if (!wdev->p2p_started)
				break;
			rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
			wdev->p2p_started = false;
			rdev->opencount--;
			break;
		default:
			break;
		}
	}
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	mutex_unlock(&rdev->devlist_mtx);
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	rtnl_unlock();

	return 0;
}

static void cfg80211_rfkill_sync_work(struct work_struct *work)
{
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	struct cfg80211_registered_device *rdev;
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	rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
	cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
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}

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static void cfg80211_event_work(struct work_struct *work)
{
	struct cfg80211_registered_device *rdev;

	rdev = container_of(work, struct cfg80211_registered_device,
			    event_work);

	rtnl_lock();
	cfg80211_lock_rdev(rdev);

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	cfg80211_process_rdev_events(rdev);
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	cfg80211_unlock_rdev(rdev);
	rtnl_unlock();
}

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/* exported functions */

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struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
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{
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	static int wiphy_counter;
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	struct cfg80211_registered_device *rdev;
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	int alloc_size;

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	WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
	WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
	WARN_ON(ops->connect && !ops->disconnect);
	WARN_ON(ops->join_ibss && !ops->leave_ibss);
	WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
	WARN_ON(ops->add_station && !ops->del_station);
	WARN_ON(ops->add_mpath && !ops->del_mpath);
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	WARN_ON(ops->join_mesh && !ops->leave_mesh);
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	alloc_size = sizeof(*rdev) + sizeof_priv;
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	rdev = kzalloc(alloc_size, GFP_KERNEL);
	if (!rdev)
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		return NULL;

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	rdev->ops = ops;
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	mutex_lock(&cfg80211_mutex);
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	rdev->wiphy_idx = wiphy_counter++;
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	if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
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		wiphy_counter--;
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		mutex_unlock(&cfg80211_mutex);
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		/* ugh, wrapped! */
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		kfree(rdev);
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		return NULL;
	}

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	mutex_unlock(&cfg80211_mutex);
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	/* give it a proper name */
	dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);

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	mutex_init(&rdev->mtx);
	mutex_init(&rdev->devlist_mtx);
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	mutex_init(&rdev->sched_scan_mtx);
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	INIT_LIST_HEAD(&rdev->wdev_list);
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	spin_lock_init(&rdev->bss_lock);
	INIT_LIST_HEAD(&rdev->bss_list);
	INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
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	INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results);
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#ifdef CONFIG_CFG80211_WEXT
	rdev->wiphy.wext = &cfg80211_wext_handler;
#endif

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	device_initialize(&rdev->wiphy.dev);
	rdev->wiphy.dev.class = &ieee80211_class;
	rdev->wiphy.dev.platform_data = rdev;

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#ifdef CONFIG_CFG80211_DEFAULT_PS
	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
#endif
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	wiphy_net_set(&rdev->wiphy, &init_net);

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	rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
	rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
				   &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
				   &rdev->rfkill_ops, rdev);

	if (!rdev->rfkill) {
		kfree(rdev);
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		return NULL;
	}

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	INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
	INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
	INIT_WORK(&rdev->event_work, cfg80211_event_work);
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	init_waitqueue_head(&rdev->dev_wait);

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	/*
	 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
	 * Fragmentation and RTS threshold are disabled by default with the
	 * special -1 value.
	 */
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	rdev->wiphy.retry_short = 7;
	rdev->wiphy.retry_long = 4;
	rdev->wiphy.frag_threshold = (u32) -1;
	rdev->wiphy.rts_threshold = (u32) -1;
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	rdev->wiphy.coverage_class = 0;
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	return &rdev->wiphy;
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}
EXPORT_SYMBOL(wiphy_new);

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static int wiphy_verify_combinations(struct wiphy *wiphy)
{
	const struct ieee80211_iface_combination *c;
	int i, j;

	for (i = 0; i < wiphy->n_iface_combinations; i++) {
		u32 cnt = 0;
		u16 all_iftypes = 0;

		c = &wiphy->iface_combinations[i];

		/* Combinations with just one interface aren't real */
		if (WARN_ON(c->max_interfaces < 2))
			return -EINVAL;

		/* Need at least one channel */
		if (WARN_ON(!c->num_different_channels))
			return -EINVAL;

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		/*
		 * Put a sane limit on maximum number of different
		 * channels to simplify channel accounting code.
		 */
		if (WARN_ON(c->num_different_channels >
				CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
			return -EINVAL;

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		if (WARN_ON(!c->n_limits))
			return -EINVAL;

		for (j = 0; j < c->n_limits; j++) {
			u16 types = c->limits[j].types;

			/*
			 * interface types shouldn't overlap, this is
			 * used in cfg80211_can_change_interface()
			 */
			if (WARN_ON(types & all_iftypes))
				return -EINVAL;
			all_iftypes |= types;

			if (WARN_ON(!c->limits[j].max))
				return -EINVAL;

			/* Shouldn't list software iftypes in combinations! */
			if (WARN_ON(wiphy->software_iftypes & types))
				return -EINVAL;

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			/* Only a single P2P_DEVICE can be allowed */
			if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
				    c->limits[j].max > 1))
				return -EINVAL;

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			cnt += c->limits[j].max;
			/*
			 * Don't advertise an unsupported type
			 * in a combination.
			 */
			if (WARN_ON((wiphy->interface_modes & types) != types))
				return -EINVAL;
		}

		/* You can't even choose that many! */
		if (WARN_ON(cnt < c->max_interfaces))
			return -EINVAL;
	}

	return 0;
}

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int wiphy_register(struct wiphy *wiphy)
{
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	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
450
	int res;
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	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	bool have_band = false;
	int i;
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	u16 ifmodes = wiphy->interface_modes;

457
#ifdef CONFIG_PM
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	if (WARN_ON((wiphy->wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
		    !(wiphy->wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
		return -EINVAL;
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#endif
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	if (WARN_ON(wiphy->ap_sme_capa &&
		    !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
		return -EINVAL;

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	if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
		return -EINVAL;

	if (WARN_ON(wiphy->addresses &&
		    !is_zero_ether_addr(wiphy->perm_addr) &&
		    memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
			   ETH_ALEN)))
		return -EINVAL;

	if (wiphy->addresses)
		memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);

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	/* sanity check ifmodes */
	WARN_ON(!ifmodes);
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	ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
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	if (WARN_ON(ifmodes != wiphy->interface_modes))
		wiphy->interface_modes = ifmodes;
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	res = wiphy_verify_combinations(wiphy);
	if (res)
		return res;

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	/* sanity check supported bands/channels */
	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		sband = wiphy->bands[band];
		if (!sband)
			continue;

		sband->band = band;
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		if (WARN_ON(!sband->n_channels))
			return -EINVAL;
		/*
		 * on 60gHz band, there are no legacy rates, so
		 * n_bitrates is 0
		 */
		if (WARN_ON(band != IEEE80211_BAND_60GHZ &&
			    !sband->n_bitrates))
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			return -EINVAL;

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		/*
		 * Since cfg80211_disable_40mhz_24ghz is global, we can
		 * modify the sband's ht data even if the driver uses a
		 * global structure for that.
		 */
		if (cfg80211_disable_40mhz_24ghz &&
		    band == IEEE80211_BAND_2GHZ &&
		    sband->ht_cap.ht_supported) {
			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
		}

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		/*
		 * Since we use a u32 for rate bitmaps in
		 * ieee80211_get_response_rate, we cannot
		 * have more than 32 legacy rates.
		 */
		if (WARN_ON(sband->n_bitrates > 32))
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			return -EINVAL;

		for (i = 0; i < sband->n_channels; i++) {
			sband->channels[i].orig_flags =
				sband->channels[i].flags;
			sband->channels[i].orig_mag =
				sband->channels[i].max_antenna_gain;
			sband->channels[i].orig_mpwr =
				sband->channels[i].max_power;
			sband->channels[i].band = band;
		}

		have_band = true;
	}

	if (!have_band) {
		WARN_ON(1);
		return -EINVAL;
	}

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#ifdef CONFIG_PM
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	if (rdev->wiphy.wowlan.n_patterns) {
		if (WARN_ON(!rdev->wiphy.wowlan.pattern_min_len ||
			    rdev->wiphy.wowlan.pattern_min_len >
			    rdev->wiphy.wowlan.pattern_max_len))
			return -EINVAL;
	}
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#endif
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	/* check and set up bitrates */
	ieee80211_set_bitrate_flags(wiphy);

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	mutex_lock(&cfg80211_mutex);

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	res = device_add(&rdev->wiphy.dev);
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	if (res) {
		mutex_unlock(&cfg80211_mutex);
		return res;
	}
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	/* set up regulatory info */
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	wiphy_regulatory_register(wiphy);
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	list_add_rcu(&rdev->list, &cfg80211_rdev_list);
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	cfg80211_rdev_list_generation++;
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	/* add to debugfs */
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	rdev->wiphy.debugfsdir =
		debugfs_create_dir(wiphy_name(&rdev->wiphy),
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				   ieee80211_debugfs_dir);
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	if (IS_ERR(rdev->wiphy.debugfsdir))
		rdev->wiphy.debugfsdir = NULL;
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	if (wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
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		struct regulatory_request request;

		request.wiphy_idx = get_wiphy_idx(wiphy);
		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
		request.alpha2[0] = '9';
		request.alpha2[1] = '9';

		nl80211_send_reg_change_event(&request);
	}

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	cfg80211_debugfs_rdev_add(rdev);
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	mutex_unlock(&cfg80211_mutex);
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	/*
	 * due to a locking dependency this has to be outside of the
	 * cfg80211_mutex lock
	 */
	res = rfkill_register(rdev->rfkill);
	if (res)
		goto out_rm_dev;

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	rtnl_lock();
	rdev->wiphy.registered = true;
	rtnl_unlock();
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	return 0;
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out_rm_dev:
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	device_del(&rdev->wiphy.dev);
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	return res;
}
EXPORT_SYMBOL(wiphy_register);

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void wiphy_rfkill_start_polling(struct wiphy *wiphy)
{
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	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
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	if (!rdev->ops->rfkill_poll)
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		return;
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	rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
	rfkill_resume_polling(rdev->rfkill);
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}
EXPORT_SYMBOL(wiphy_rfkill_start_polling);

void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
{
623
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
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624

625
	rfkill_pause_polling(rdev->rfkill);
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626 627 628
}
EXPORT_SYMBOL(wiphy_rfkill_stop_polling);

629 630
void wiphy_unregister(struct wiphy *wiphy)
{
631
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
632

633 634 635 636
	rtnl_lock();
	rdev->wiphy.registered = false;
	rtnl_unlock();

637
	rfkill_unregister(rdev->rfkill);
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638

639
	/* protect the device list */
640
	mutex_lock(&cfg80211_mutex);
641

642 643 644 645 646
	wait_event(rdev->dev_wait, ({
		int __count;
		mutex_lock(&rdev->devlist_mtx);
		__count = rdev->opencount;
		mutex_unlock(&rdev->devlist_mtx);
647
		__count == 0; }));
648 649

	mutex_lock(&rdev->devlist_mtx);
650
	BUG_ON(!list_empty(&rdev->wdev_list));
651 652 653 654 655 656
	mutex_unlock(&rdev->devlist_mtx);

	/*
	 * First remove the hardware from everywhere, this makes
	 * it impossible to find from userspace.
	 */
657
	debugfs_remove_recursive(rdev->wiphy.debugfsdir);
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658 659
	list_del_rcu(&rdev->list);
	synchronize_rcu();
660 661

	/*
662
	 * Try to grab rdev->mtx. If a command is still in progress,
663 664 665 666
	 * hopefully the driver will refuse it since it's tearing
	 * down the device already. We wait for this command to complete
	 * before unlinking the item from the list.
	 * Note: as codified by the BUG_ON above we cannot get here if
667 668 669
	 * a virtual interface is still present. Hence, we can only get
	 * to lock contention here if userspace issues a command that
	 * identified the hardware by wiphy index.
670
	 */
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671
	cfg80211_lock_rdev(rdev);
672
	/* nothing */
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673
	cfg80211_unlock_rdev(rdev);
674

675 676 677 678 679
	/*
	 * If this device got a regulatory hint tell core its
	 * free to listen now to a new shiny device regulatory hint
	 */
	wiphy_regulatory_deregister(wiphy);
680

681
	cfg80211_rdev_list_generation++;
682
	device_del(&rdev->wiphy.dev);
683

684
	mutex_unlock(&cfg80211_mutex);
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685

686
	flush_work(&rdev->scan_done_wk);
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687 688
	cancel_work_sync(&rdev->conn_work);
	flush_work(&rdev->event_work);
689 690 691 692

	if (rdev->wowlan && rdev->ops->set_wakeup)
		rdev->ops->set_wakeup(&rdev->wiphy, false);
	cfg80211_rdev_free_wowlan(rdev);
693 694 695
}
EXPORT_SYMBOL(wiphy_unregister);

696
void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
697
{
698
	struct cfg80211_internal_bss *scan, *tmp;
699 700 701
	rfkill_destroy(rdev->rfkill);
	mutex_destroy(&rdev->mtx);
	mutex_destroy(&rdev->devlist_mtx);
702
	mutex_destroy(&rdev->sched_scan_mtx);
703
	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
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704
		cfg80211_put_bss(&scan->pub);
705
	kfree(rdev);
706 707 708 709 710 711 712 713
}

void wiphy_free(struct wiphy *wiphy)
{
	put_device(&wiphy->dev);
}
EXPORT_SYMBOL(wiphy_free);

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714 715
void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
{
716
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
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717

718 719
	if (rfkill_set_hw_state(rdev->rfkill, blocked))
		schedule_work(&rdev->rfkill_sync);
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720 721 722
}
EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);

723 724 725 726 727 728 729 730 731 732
static void wdev_cleanup_work(struct work_struct *work)
{
	struct wireless_dev *wdev;
	struct cfg80211_registered_device *rdev;

	wdev = container_of(work, struct wireless_dev, cleanup_work);
	rdev = wiphy_to_dev(wdev->wiphy);

	cfg80211_lock_rdev(rdev);

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733
	if (WARN_ON(rdev->scan_req && rdev->scan_req->wdev == wdev)) {
734
		rdev->scan_req->aborted = true;
735
		___cfg80211_scan_done(rdev, true);
736 737
	}

738 739 740 741
	cfg80211_unlock_rdev(rdev);

	mutex_lock(&rdev->sched_scan_mtx);

742 743 744 745 746
	if (WARN_ON(rdev->sched_scan_req &&
		    rdev->sched_scan_req->dev == wdev->netdev)) {
		__cfg80211_stop_sched_scan(rdev, false);
	}

747
	mutex_unlock(&rdev->sched_scan_mtx);
748 749 750 751 752 753 754 755 756

	mutex_lock(&rdev->devlist_mtx);
	rdev->opencount--;
	mutex_unlock(&rdev->devlist_mtx);
	wake_up(&rdev->dev_wait);

	dev_put(wdev->netdev);
}

757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
void cfg80211_unregister_wdev(struct wireless_dev *wdev)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);

	ASSERT_RTNL();

	if (WARN_ON(wdev->netdev))
		return;

	mutex_lock(&rdev->devlist_mtx);
	list_del_rcu(&wdev->list);
	rdev->devlist_generation++;

	switch (wdev->iftype) {
	case NL80211_IFTYPE_P2P_DEVICE:
		if (!wdev->p2p_started)
			break;
		rdev->ops->stop_p2p_device(&rdev->wiphy, wdev);
		wdev->p2p_started = false;
		rdev->opencount--;
		break;
	default:
		WARN_ON_ONCE(1);
		break;
	}
	mutex_unlock(&rdev->devlist_mtx);
}
EXPORT_SYMBOL(cfg80211_unregister_wdev);

786 787 788 789
static struct device_type wiphy_type = {
	.name	= "wlan",
};

790 791 792
void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
			       enum nl80211_iftype iftype, int num)
{
793
	ASSERT_RTNL();
794 795 796 797 798 799

	rdev->num_running_ifaces += num;
	if (iftype == NL80211_IFTYPE_MONITOR)
		rdev->num_running_monitor_ifaces += num;
}

800
static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
801 802 803 804
					 unsigned long state,
					 void *ndev)
{
	struct net_device *dev = ndev;
805
	struct wireless_dev *wdev = dev->ieee80211_ptr;
806
	struct cfg80211_registered_device *rdev;
807
	int ret;
808

809
	if (!wdev)
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810
		return NOTIFY_DONE;
811

812
	rdev = wiphy_to_dev(wdev->wiphy);
813

814
	WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
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815

816
	switch (state) {
817 818 819
	case NETDEV_POST_INIT:
		SET_NETDEV_DEVTYPE(dev, &wiphy_type);
		break;
820
	case NETDEV_REGISTER:
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821 822 823 824 825
		/*
		 * NB: cannot take rdev->mtx here because this may be
		 * called within code protected by it when interfaces
		 * are added with nl80211.
		 */
J
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826
		mutex_init(&wdev->mtx);
827
		INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work);
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828 829
		INIT_LIST_HEAD(&wdev->event_list);
		spin_lock_init(&wdev->event_lock);
830 831
		INIT_LIST_HEAD(&wdev->mgmt_registrations);
		spin_lock_init(&wdev->mgmt_registrations_lock);
832

833
		mutex_lock(&rdev->devlist_mtx);
834 835
		wdev->identifier = ++rdev->wdev_id;
		list_add_rcu(&wdev->list, &rdev->wdev_list);
836
		rdev->devlist_generation++;
837 838 839
		/* can only change netns with wiphy */
		dev->features |= NETIF_F_NETNS_LOCAL;

840 841
		if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
				      "phy80211")) {
842
			pr_err("failed to add phy80211 symlink to netdev!\n");
843
		}
844
		wdev->netdev = dev;
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Samuel Ortiz 已提交
845
		wdev->sme_state = CFG80211_SME_IDLE;
J
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846
		mutex_unlock(&rdev->devlist_mtx);
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847
#ifdef CONFIG_CFG80211_WEXT
848 849
		wdev->wext.default_key = -1;
		wdev->wext.default_mgmt_key = -1;
850
		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
K
Kalle Valo 已提交
851 852
#endif

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853
		if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
K
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854
			wdev->ps = true;
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855
		else
K
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856
			wdev->ps = false;
857 858
		/* allow mac80211 to determine the timeout */
		wdev->ps_timeout = -1;
K
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859

860 861
		if (!dev->ethtool_ops)
			dev->ethtool_ops = &cfg80211_ethtool_ops;
862 863

		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
864
		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
865 866
		     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
			dev->priv_flags |= IFF_DONT_BRIDGE;
867
		break;
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868
	case NETDEV_GOING_DOWN:
S
Samuel Ortiz 已提交
869 870 871 872
		switch (wdev->iftype) {
		case NL80211_IFTYPE_ADHOC:
			cfg80211_leave_ibss(rdev, dev, true);
			break;
873
		case NL80211_IFTYPE_P2P_CLIENT:
S
Samuel Ortiz 已提交
874
		case NL80211_IFTYPE_STATION:
875
			mutex_lock(&rdev->sched_scan_mtx);
876
			__cfg80211_stop_sched_scan(rdev, false);
877
			mutex_unlock(&rdev->sched_scan_mtx);
878

J
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879
			wdev_lock(wdev);
J
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880
#ifdef CONFIG_CFG80211_WEXT
881 882 883
			kfree(wdev->wext.ie);
			wdev->wext.ie = NULL;
			wdev->wext.ie_len = 0;
J
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884
			wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
885
#endif
J
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886 887
			__cfg80211_disconnect(rdev, dev,
					      WLAN_REASON_DEAUTH_LEAVING, true);
J
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888
			cfg80211_mlme_down(rdev, dev);
J
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889
			wdev_unlock(wdev);
S
Samuel Ortiz 已提交
890
			break;
891 892 893
		case NL80211_IFTYPE_MESH_POINT:
			cfg80211_leave_mesh(rdev, dev);
			break;
894 895 896
		case NL80211_IFTYPE_AP:
			cfg80211_stop_ap(rdev, dev);
			break;
S
Samuel Ortiz 已提交
897 898 899
		default:
			break;
		}
900
		wdev->beacon_interval = 0;
901 902
		break;
	case NETDEV_DOWN:
903
		cfg80211_update_iface_num(rdev, wdev->iftype, -1);
904
		dev_hold(dev);
905
		queue_work(cfg80211_wq, &wdev->cleanup_work);
J
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906 907
		break;
	case NETDEV_UP:
908 909 910 911 912 913 914 915 916 917 918 919
		/*
		 * If we have a really quick DOWN/UP succession we may
		 * have this work still pending ... cancel it and see
		 * if it was pending, in which case we need to account
		 * for some of the work it would have done.
		 */
		if (cancel_work_sync(&wdev->cleanup_work)) {
			mutex_lock(&rdev->devlist_mtx);
			rdev->opencount--;
			mutex_unlock(&rdev->devlist_mtx);
			dev_put(dev);
		}
920
		cfg80211_update_iface_num(rdev, wdev->iftype, 1);
J
Johannes Berg 已提交
921
		cfg80211_lock_rdev(rdev);
922
		mutex_lock(&rdev->devlist_mtx);
J
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923
		wdev_lock(wdev);
924
		switch (wdev->iftype) {
925
#ifdef CONFIG_CFG80211_WEXT
926
		case NL80211_IFTYPE_ADHOC:
J
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927
			cfg80211_ibss_wext_join(rdev, wdev);
J
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928
			break;
929
		case NL80211_IFTYPE_STATION:
J
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930
			cfg80211_mgd_wext_connect(rdev, wdev);
931
			break;
932
#endif
933
#ifdef CONFIG_MAC80211_MESH
934
		case NL80211_IFTYPE_MESH_POINT:
935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
			{
				/* backward compat code... */
				struct mesh_setup setup;
				memcpy(&setup, &default_mesh_setup,
						sizeof(setup));
				 /* back compat only needed for mesh_id */
				setup.mesh_id = wdev->ssid;
				setup.mesh_id_len = wdev->mesh_id_up_len;
				if (wdev->mesh_id_up_len)
					__cfg80211_join_mesh(rdev, dev,
							&setup,
							&default_mesh_config);
				break;
			}
#endif
950
		default:
J
Johannes Berg 已提交
951
			break;
952
		}
J
Johannes Berg 已提交
953
		wdev_unlock(wdev);
954
		rdev->opencount++;
955
		mutex_unlock(&rdev->devlist_mtx);
J
Johannes Berg 已提交
956
		cfg80211_unlock_rdev(rdev);
957 958 959 960 961

		/*
		 * Configure power management to the driver here so that its
		 * correctly set also after interface type changes etc.
		 */
962 963
		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
964 965 966 967 968 969 970
		    rdev->ops->set_power_mgmt)
			if (rdev->ops->set_power_mgmt(wdev->wiphy, dev,
						      wdev->ps,
						      wdev->ps_timeout)) {
				/* assume this means it's off */
				wdev->ps = false;
			}
971
		break;
972
	case NETDEV_UNREGISTER:
J
Johannes Berg 已提交
973 974 975 976 977
		/*
		 * NB: cannot take rdev->mtx here because this may be
		 * called within code protected by it when interfaces
		 * are removed with nl80211.
		 */
978
		mutex_lock(&rdev->devlist_mtx);
979 980 981 982 983 984 985
		/*
		 * It is possible to get NETDEV_UNREGISTER
		 * multiple times. To detect that, check
		 * that the interface is still on the list
		 * of registered interfaces, and only then
		 * remove and clean it up.
		 */
986
		if (!list_empty(&wdev->list)) {
987
			sysfs_remove_link(&dev->dev.kobj, "phy80211");
J
Johannes Berg 已提交
988
			list_del_rcu(&wdev->list);
989
			rdev->devlist_generation++;
990
			cfg80211_mlme_purge_registrations(wdev);
J
Johannes Berg 已提交
991
#ifdef CONFIG_CFG80211_WEXT
992
			kfree(wdev->wext.keys);
J
Johannes Berg 已提交
993
#endif
994 995
		}
		mutex_unlock(&rdev->devlist_mtx);
J
Johannes Berg 已提交
996 997 998 999 1000 1001 1002 1003
		/*
		 * synchronise (so that we won't find this netdev
		 * from other code any more) and then clear the list
		 * head so that the above code can safely check for
		 * !list_empty() to avoid double-cleanup.
		 */
		synchronize_rcu();
		INIT_LIST_HEAD(&wdev->list);
1004 1005 1006 1007 1008
		/*
		 * Ensure that all events have been processed and
		 * freed.
		 */
		cfg80211_process_wdev_events(wdev);
1009
		break;
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1010
	case NETDEV_PRE_UP:
1011 1012
		if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
			return notifier_from_errno(-EOPNOTSUPP);
J
Johannes Berg 已提交
1013 1014
		if (rfkill_blocked(rdev->rfkill))
			return notifier_from_errno(-ERFKILL);
1015
		mutex_lock(&rdev->devlist_mtx);
1016
		ret = cfg80211_can_add_interface(rdev, wdev->iftype);
1017
		mutex_unlock(&rdev->devlist_mtx);
1018 1019
		if (ret)
			return notifier_from_errno(ret);
J
Johannes Berg 已提交
1020
		break;
1021 1022
	}

J
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1023
	return NOTIFY_DONE;
1024 1025 1026 1027 1028 1029
}

static struct notifier_block cfg80211_netdev_notifier = {
	.notifier_call = cfg80211_netdev_notifier_call,
};

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
static void __net_exit cfg80211_pernet_exit(struct net *net)
{
	struct cfg80211_registered_device *rdev;

	rtnl_lock();
	mutex_lock(&cfg80211_mutex);
	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (net_eq(wiphy_net(&rdev->wiphy), net))
			WARN_ON(cfg80211_switch_netns(rdev, &init_net));
	}
	mutex_unlock(&cfg80211_mutex);
	rtnl_unlock();
}

static struct pernet_operations cfg80211_pernet_ops = {
	.exit = cfg80211_pernet_exit,
};

static int __init cfg80211_init(void)
1049
{
1050 1051
	int err;

1052 1053 1054 1055
	err = register_pernet_device(&cfg80211_pernet_ops);
	if (err)
		goto out_fail_pernet;

1056
	err = wiphy_sysfs_init();
1057 1058 1059 1060 1061 1062 1063
	if (err)
		goto out_fail_sysfs;

	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	if (err)
		goto out_fail_notifier;

1064 1065 1066 1067
	err = nl80211_init();
	if (err)
		goto out_fail_nl80211;

1068 1069
	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);

1070 1071 1072 1073
	err = regulatory_init();
	if (err)
		goto out_fail_reg;

1074 1075 1076 1077
	cfg80211_wq = create_singlethread_workqueue("cfg80211");
	if (!cfg80211_wq)
		goto out_fail_wq;

1078 1079
	return 0;

1080 1081
out_fail_wq:
	regulatory_exit();
1082 1083
out_fail_reg:
	debugfs_remove(ieee80211_debugfs_dir);
1084 1085
out_fail_nl80211:
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1086 1087 1088
out_fail_notifier:
	wiphy_sysfs_exit();
out_fail_sysfs:
1089 1090
	unregister_pernet_device(&cfg80211_pernet_ops);
out_fail_pernet:
1091 1092
	return err;
}
1093
subsys_initcall(cfg80211_init);
1094

1095
static void __exit cfg80211_exit(void)
1096 1097
{
	debugfs_remove(ieee80211_debugfs_dir);
1098
	nl80211_exit();
1099 1100
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
	wiphy_sysfs_exit();
1101
	regulatory_exit();
1102
	unregister_pernet_device(&cfg80211_pernet_ops);
1103
	destroy_workqueue(cfg80211_wq);
1104 1105
}
module_exit(cfg80211_exit);