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linux/net/wireless/core.c
Martin Willi c90b670b5c nl80211: announce radios/interfaces when switching namespaces 
When a wiphy changes its namespace, all interfaces are moved to the
new namespace as well. The network interfaces are properly announced
as leaving on the old and as appearing on the new namespace through
RTM_NEWLINK/RTM_DELLINK. On nl80211, however, these events are missing
for radios and their interfaces.

Add netlink announcements through nl80211 when switching namespaces,
so userspace can rely on these events to discover radios properly.

Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2018-11-09 11:21:10 +01:00

1492 lines
38 KiB
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/*
* This is the linux wireless configuration interface.
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright 2015-2017 Intel Deutschland GmbH
* Copyright (C) 2018 Intel Corporation
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"
#include "debugfs.h"
#include "wext-compat.h"
#include "rdev-ops.h"
/* name for sysfs, %d is appended */
#define PHY_NAME "phy"
MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");
MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
/* RCU-protected (and RTNL for writers) */
LIST_HEAD(cfg80211_rdev_list);
int cfg80211_rdev_list_generation;
/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;
/* for the cleanup, scan and event works */
struct workqueue_struct *cfg80211_wq;
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");
struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
{
struct cfg80211_registered_device *result = NULL, *rdev;
ASSERT_RTNL();
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
if (rdev->wiphy_idx == wiphy_idx) {
result = rdev;
break;
}
}
return result;
}
int get_wiphy_idx(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
return rdev->wiphy_idx;
}
struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
{
struct cfg80211_registered_device *rdev;
ASSERT_RTNL();
rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
if (!rdev)
return NULL;
return &rdev->wiphy;
}
static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
const char *newname)
{
struct cfg80211_registered_device *rdev2;
int wiphy_idx, taken = -1, digits;
ASSERT_RTNL();
if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
return -EINVAL;
/* 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;
}
/* Ensure another device does not already have this name. */
list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
return -EINVAL;
return 0;
}
int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname)
{
int result;
ASSERT_RTNL();
/* Ignore nop renames */
if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
return 0;
result = cfg80211_dev_check_name(rdev, newname);
if (result < 0)
return result;
result = device_rename(&rdev->wiphy.dev, newname);
if (result)
return result;
if (rdev->wiphy.debugfsdir &&
!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
rdev->wiphy.debugfsdir,
rdev->wiphy.debugfsdir->d_parent,
newname))
pr_err("failed to rename debugfs dir to %s!\n", newname);
nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
return 0;
}
int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
struct net *net)
{
struct wireless_dev *wdev;
int err = 0;
if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
return -EOPNOTSUPP;
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (!wdev->netdev)
continue;
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);
list_for_each_entry_continue_reverse(wdev,
&rdev->wiphy.wdev_list,
list) {
if (!wdev->netdev)
continue;
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;
}
return err;
}
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (!wdev->netdev)
continue;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
}
nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
wiphy_net_set(&rdev->wiphy, net);
err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
WARN_ON(err);
nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (!wdev->netdev)
continue;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
}
return 0;
}
static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
{
struct cfg80211_registered_device *rdev = data;
rdev_rfkill_poll(rdev);
}
void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev)
{
ASSERT_RTNL();
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
return;
if (!wdev_running(wdev))
return;
rdev_stop_p2p_device(rdev, wdev);
wdev->is_running = false;
rdev->opencount--;
if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
if (WARN_ON(!rdev->scan_req->notified))
rdev->scan_req->info.aborted = true;
___cfg80211_scan_done(rdev, false);
}
}
void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev)
{
ASSERT_RTNL();
if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
return;
if (!wdev_running(wdev))
return;
rdev_stop_nan(rdev, wdev);
wdev->is_running = false;
rdev->opencount--;
}
void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct wireless_dev *wdev;
ASSERT_RTNL();
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
if (wdev->netdev) {
dev_close(wdev->netdev);
continue;
}
/* otherwise, check iftype */
switch (wdev->iftype) {
case NL80211_IFTYPE_P2P_DEVICE:
cfg80211_stop_p2p_device(rdev, wdev);
break;
case NL80211_IFTYPE_NAN:
cfg80211_stop_nan(rdev, wdev);
break;
default:
break;
}
}
}
EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
static int cfg80211_rfkill_set_block(void *data, bool blocked)
{
struct cfg80211_registered_device *rdev = data;
if (!blocked)
return 0;
rtnl_lock();
cfg80211_shutdown_all_interfaces(&rdev->wiphy);
rtnl_unlock();
return 0;
}
static void cfg80211_rfkill_sync_work(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));
}
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_process_rdev_events(rdev);
rtnl_unlock();
}
void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
{
struct wireless_dev *wdev, *tmp;
ASSERT_RTNL();
list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
if (wdev->nl_owner_dead)
rdev_del_virtual_intf(rdev, wdev);
}
}
static void cfg80211_destroy_iface_wk(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device,
destroy_work);
rtnl_lock();
cfg80211_destroy_ifaces(rdev);
rtnl_unlock();
}
static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
struct cfg80211_sched_scan_request *req, *tmp;
rdev = container_of(work, struct cfg80211_registered_device,
sched_scan_stop_wk);
rtnl_lock();
list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
if (req->nl_owner_dead)
cfg80211_stop_sched_scan_req(rdev, req, false);
}
rtnl_unlock();
}
static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device,
propagate_radar_detect_wk);
rtnl_lock();
regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
NL80211_DFS_UNAVAILABLE,
NL80211_RADAR_DETECTED);
rtnl_unlock();
}
static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
{
struct cfg80211_registered_device *rdev;
rdev = container_of(work, struct cfg80211_registered_device,
propagate_cac_done_wk);
rtnl_lock();
regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
NL80211_DFS_AVAILABLE,
NL80211_RADAR_CAC_FINISHED);
rtnl_unlock();
}
/* exported functions */
struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
const char *requested_name)
{
static atomic_t wiphy_counter = ATOMIC_INIT(0);
struct cfg80211_registered_device *rdev;
int alloc_size;
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);
WARN_ON(ops->join_mesh && !ops->leave_mesh);
WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
WARN_ON(ops->start_ap && !ops->stop_ap);
WARN_ON(ops->join_ocb && !ops->leave_ocb);
WARN_ON(ops->suspend && !ops->resume);
WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
alloc_size = sizeof(*rdev) + sizeof_priv;
rdev = kzalloc(alloc_size, GFP_KERNEL);
if (!rdev)
return NULL;
rdev->ops = ops;
rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
if (unlikely(rdev->wiphy_idx < 0)) {
/* ugh, wrapped! */
atomic_dec(&wiphy_counter);
kfree(rdev);
return NULL;
}
/* atomic_inc_return makes it start at 1, make it start at 0 */
rdev->wiphy_idx--;
/* give it a proper name */
if (requested_name && requested_name[0]) {
int rv;
rtnl_lock();
rv = cfg80211_dev_check_name(rdev, requested_name);
if (rv < 0) {
rtnl_unlock();
goto use_default_name;
}
rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
rtnl_unlock();
if (rv)
goto use_default_name;
} else {
int rv;
use_default_name:
/* NOTE: This is *probably* safe w/out holding rtnl because of
* the restrictions on phy names. Probably this call could
* fail if some other part of the kernel (re)named a device
* phyX. But, might should add some locking and check return
* value, and use a different name if this one exists?
*/
rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
if (rv < 0) {
kfree(rdev);
return NULL;
}
}
INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
INIT_LIST_HEAD(&rdev->beacon_registrations);
spin_lock_init(&rdev->beacon_registrations_lock);
spin_lock_init(&rdev->bss_lock);
INIT_LIST_HEAD(&rdev->bss_list);
INIT_LIST_HEAD(&rdev->sched_scan_req_list);
INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);
INIT_LIST_HEAD(&rdev->mlme_unreg);
spin_lock_init(&rdev->mlme_unreg_lock);
INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);
INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
cfg80211_dfs_channels_update_work);
#ifdef CONFIG_CFG80211_WEXT
rdev->wiphy.wext = &cfg80211_wext_handler;
#endif
device_initialize(&rdev->wiphy.dev);
rdev->wiphy.dev.class = &ieee80211_class;
rdev->wiphy.dev.platform_data = rdev;
device_enable_async_suspend(&rdev->wiphy.dev);
INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
INIT_WORK(&rdev->propagate_radar_detect_wk,
cfg80211_propagate_radar_detect_wk);
INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
#ifdef CONFIG_CFG80211_DEFAULT_PS
rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
#endif
wiphy_net_set(&rdev->wiphy, &init_net);
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);
return NULL;
}
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);
init_waitqueue_head(&rdev->dev_wait);
/*
* Initialize wiphy parameters to IEEE 802.11 MIB default values.
* Fragmentation and RTS threshold are disabled by default with the
* special -1 value.
*/
rdev->wiphy.retry_short = 7;
rdev->wiphy.retry_long = 4;
rdev->wiphy.frag_threshold = (u32) -1;
rdev->wiphy.rts_threshold = (u32) -1;
rdev->wiphy.coverage_class = 0;
rdev->wiphy.max_num_csa_counters = 1;
rdev->wiphy.max_sched_scan_plans = 1;
rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new_nm);
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,
* however we make an exception for DFS.
*/
if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
return -EINVAL;
/* Need at least one channel */
if (WARN_ON(!c->num_different_channels))
return -EINVAL;
/*
* 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;
/* DFS only works on one channel. */
if (WARN_ON(c->radar_detect_widths &&
(c->num_different_channels > 1)))
return -EINVAL;
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 */
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;
/* Only a single P2P_DEVICE can be allowed */
if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
c->limits[j].max > 1))
return -EINVAL;
/* Only a single NAN can be allowed */
if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
c->limits[j].max > 1))
return -EINVAL;
/*
* This isn't well-defined right now. If you have an
* IBSS interface, then its beacon interval may change
* by joining other networks, and nothing prevents it
* from doing that.
* So technically we probably shouldn't even allow AP
* and IBSS in the same interface, but it seems that
* some drivers support that, possibly only with fixed
* beacon intervals for IBSS.
*/
if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
c->beacon_int_min_gcd)) {
return -EINVAL;
}
cnt += c->limits[j].max;
/*
* Don't advertise an unsupported type
* in a combination.
*/
if (WARN_ON((wiphy->interface_modes & types) != types))
return -EINVAL;
}
#ifndef CONFIG_WIRELESS_WDS
if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
return -EINVAL;
#endif
/* You can't even choose that many! */
if (WARN_ON(cnt < c->max_interfaces))
return -EINVAL;
}
return 0;
}
int wiphy_register(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
int res;
enum nl80211_band band;
struct ieee80211_supported_band *sband;
bool have_band = false;
int i;
u16 ifmodes = wiphy->interface_modes;
#ifdef CONFIG_PM
if (WARN_ON(wiphy->wowlan &&
(wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
!(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
return -EINVAL;
if (WARN_ON(wiphy->wowlan &&
!wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
!wiphy->wowlan->tcp))
return -EINVAL;
#endif
if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
(!rdev->ops->tdls_channel_switch ||
!rdev->ops->tdls_cancel_channel_switch)))
return -EINVAL;
if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
(!rdev->ops->start_nan || !rdev->ops->stop_nan ||
!rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
!(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
return -EINVAL;
#ifndef CONFIG_WIRELESS_WDS
if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
return -EINVAL;
#endif
if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
return -EINVAL;
if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
!wiphy->pmsr_capa->ftm.non_asap))
return -EINVAL;
if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
!wiphy->pmsr_capa->ftm.bandwidths))
return -EINVAL;
if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
~(BIT(NL80211_PREAMBLE_LEGACY) |
BIT(NL80211_PREAMBLE_HT) |
BIT(NL80211_PREAMBLE_VHT) |
BIT(NL80211_PREAMBLE_DMG))))
return -EINVAL;
if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
BIT(NL80211_CHAN_WIDTH_20) |
BIT(NL80211_CHAN_WIDTH_40) |
BIT(NL80211_CHAN_WIDTH_80) |
BIT(NL80211_CHAN_WIDTH_80P80) |
BIT(NL80211_CHAN_WIDTH_160) |
BIT(NL80211_CHAN_WIDTH_5) |
BIT(NL80211_CHAN_WIDTH_10))))
return -EINVAL;
}
/*
* if a wiphy has unsupported modes for regulatory channel enforcement,
* opt-out of enforcement checking
*/
if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
BIT(NL80211_IFTYPE_P2P_CLIENT) |
BIT(NL80211_IFTYPE_AP) |
BIT(NL80211_IFTYPE_P2P_GO) |
BIT(NL80211_IFTYPE_ADHOC) |
BIT(NL80211_IFTYPE_P2P_DEVICE) |
BIT(NL80211_IFTYPE_NAN) |
BIT(NL80211_IFTYPE_AP_VLAN) |
BIT(NL80211_IFTYPE_MONITOR)))
wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
(wiphy->regulatory_flags &
(REGULATORY_CUSTOM_REG |
REGULATORY_STRICT_REG |
REGULATORY_COUNTRY_IE_FOLLOW_POWER |
REGULATORY_COUNTRY_IE_IGNORE))))
return -EINVAL;
if (WARN_ON(wiphy->coalesce &&
(!wiphy->coalesce->n_rules ||
!wiphy->coalesce->n_patterns) &&
(!wiphy->coalesce->pattern_min_len ||
wiphy->coalesce->pattern_min_len >
wiphy->coalesce->pattern_max_len)))
return -EINVAL;
if (WARN_ON(wiphy->ap_sme_capa &&
!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
return -EINVAL;
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 (WARN_ON(wiphy->max_acl_mac_addrs &&
(!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
!rdev->ops->set_mac_acl)))
return -EINVAL;
/* assure only valid behaviours are flagged by driver
* hence subtract 2 as bit 0 is invalid.
*/
if (WARN_ON(wiphy->bss_select_support &&
(wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
return -EINVAL;
if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
(!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
return -EINVAL;
if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
rdev->ops->update_connect_params))
return -EINVAL;
if (wiphy->addresses)
memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
/* sanity check ifmodes */
WARN_ON(!ifmodes);
ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
if (WARN_ON(ifmodes != wiphy->interface_modes))
wiphy->interface_modes = ifmodes;
res = wiphy_verify_combinations(wiphy);
if (res)
return res;
/* sanity check supported bands/channels */
for (band = 0; band < NUM_NL80211_BANDS; band++) {
u16 types = 0;
sband = wiphy->bands[band];
if (!sband)
continue;
sband->band = band;
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 != NL80211_BAND_60GHZ &&
!sband->n_bitrates))
return -EINVAL;
/*
* 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 == NL80211_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;
}
/*
* 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))
return -EINVAL;
for (i = 0; i < sband->n_channels; i++) {
sband->channels[i].orig_flags =
sband->channels[i].flags;
sband->channels[i].orig_mag = INT_MAX;
sband->channels[i].orig_mpwr =
sband->channels[i].max_power;
sband->channels[i].band = band;
}
for (i = 0; i < sband->n_iftype_data; i++) {
const struct ieee80211_sband_iftype_data *iftd;
iftd = &sband->iftype_data[i];
if (WARN_ON(!iftd->types_mask))
return -EINVAL;
if (WARN_ON(types & iftd->types_mask))
return -EINVAL;
/* at least one piece of information must be present */
if (WARN_ON(!iftd->he_cap.has_he))
return -EINVAL;
types |= iftd->types_mask;
}
have_band = true;
}
if (!have_band) {
WARN_ON(1);
return -EINVAL;
}
#ifdef CONFIG_PM
if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
(!rdev->wiphy.wowlan->pattern_min_len ||
rdev->wiphy.wowlan->pattern_min_len >
rdev->wiphy.wowlan->pattern_max_len)))
return -EINVAL;
#endif
/* check and set up bitrates */
ieee80211_set_bitrate_flags(wiphy);
rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
rtnl_lock();
res = device_add(&rdev->wiphy.dev);
if (res) {
rtnl_unlock();
return res;
}
/* set up regulatory info */
wiphy_regulatory_register(wiphy);
list_add_rcu(&rdev->list, &cfg80211_rdev_list);
cfg80211_rdev_list_generation++;
/* add to debugfs */
rdev->wiphy.debugfsdir =
debugfs_create_dir(wiphy_name(&rdev->wiphy),
ieee80211_debugfs_dir);
if (IS_ERR(rdev->wiphy.debugfsdir))
rdev->wiphy.debugfsdir = NULL;
cfg80211_debugfs_rdev_add(rdev);
nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
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);
}
/* Check that nobody globally advertises any capabilities they do not
* advertise on all possible interface types.
*/
if (wiphy->extended_capabilities_len &&
wiphy->num_iftype_ext_capab &&
wiphy->iftype_ext_capab) {
u8 supported_on_all, j;
const struct wiphy_iftype_ext_capab *capab;
capab = wiphy->iftype_ext_capab;
for (j = 0; j < wiphy->extended_capabilities_len; j++) {
if (capab[0].extended_capabilities_len > j)
supported_on_all =
capab[0].extended_capabilities[j];
else
supported_on_all = 0x00;
for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
if (j >= capab[i].extended_capabilities_len) {
supported_on_all = 0x00;
break;
}
supported_on_all &=
capab[i].extended_capabilities[j];
}
if (WARN_ON(wiphy->extended_capabilities[j] &
~supported_on_all))
break;
}
}
rdev->wiphy.registered = true;
rtnl_unlock();
res = rfkill_register(rdev->rfkill);
if (res) {
rfkill_destroy(rdev->rfkill);
rdev->rfkill = NULL;
wiphy_unregister(&rdev->wiphy);
return res;
}
return 0;
}
EXPORT_SYMBOL(wiphy_register);
void wiphy_rfkill_start_polling(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
if (!rdev->ops->rfkill_poll)
return;
rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
rfkill_resume_polling(rdev->rfkill);
}
EXPORT_SYMBOL(wiphy_rfkill_start_polling);
void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
rfkill_pause_polling(rdev->rfkill);
}
EXPORT_SYMBOL(wiphy_rfkill_stop_polling);
void wiphy_unregister(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
wait_event(rdev->dev_wait, ({
int __count;
rtnl_lock();
__count = rdev->opencount;
rtnl_unlock();
__count == 0; }));
if (rdev->rfkill)
rfkill_unregister(rdev->rfkill);
rtnl_lock();
nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
rdev->wiphy.registered = false;
WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
/*
* First remove the hardware from everywhere, this makes
* it impossible to find from userspace.
*/
debugfs_remove_recursive(rdev->wiphy.debugfsdir);
list_del_rcu(&rdev->list);
synchronize_rcu();
/*
* 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);
cfg80211_rdev_list_generation++;
device_del(&rdev->wiphy.dev);
rtnl_unlock();
flush_work(&rdev->scan_done_wk);
cancel_work_sync(&rdev->conn_work);
flush_work(&rdev->event_work);
cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
flush_work(&rdev->destroy_work);
flush_work(&rdev->sched_scan_stop_wk);
flush_work(&rdev->mlme_unreg_wk);
flush_work(&rdev->propagate_radar_detect_wk);
flush_work(&rdev->propagate_cac_done_wk);
#ifdef CONFIG_PM
if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
rdev_set_wakeup(rdev, false);
#endif
cfg80211_rdev_free_wowlan(rdev);
cfg80211_rdev_free_coalesce(rdev);
}
EXPORT_SYMBOL(wiphy_unregister);
void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
{
struct cfg80211_internal_bss *scan, *tmp;
struct cfg80211_beacon_registration *reg, *treg;
rfkill_destroy(rdev->rfkill);
list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
list_del(&reg->list);
kfree(reg);
}
list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
cfg80211_put_bss(&rdev->wiphy, &scan->pub);
kfree(rdev);
}
void wiphy_free(struct wiphy *wiphy)
{
put_device(&wiphy->dev);
}
EXPORT_SYMBOL(wiphy_free);
void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
if (rfkill_set_hw_state(rdev->rfkill, blocked))
schedule_work(&rdev->rfkill_sync);
}
EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);
void cfg80211_cqm_config_free(struct wireless_dev *wdev)
{
kfree(wdev->cqm_config);
wdev->cqm_config = NULL;
}
static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
ASSERT_RTNL();
nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
list_del_rcu(&wdev->list);
if (sync)
synchronize_rcu();
rdev->devlist_generation++;
cfg80211_mlme_purge_registrations(wdev);
switch (wdev->iftype) {
case NL80211_IFTYPE_P2P_DEVICE:
cfg80211_stop_p2p_device(rdev, wdev);
break;
case NL80211_IFTYPE_NAN:
cfg80211_stop_nan(rdev, wdev);
break;
default:
break;
}
#ifdef CONFIG_CFG80211_WEXT
kzfree(wdev->wext.keys);
#endif
/* only initialized if we have a netdev */
if (wdev->netdev)
flush_work(&wdev->disconnect_wk);
cfg80211_cqm_config_free(wdev);
}
void cfg80211_unregister_wdev(struct wireless_dev *wdev)
{
if (WARN_ON(wdev->netdev))
return;
__cfg80211_unregister_wdev(wdev, true);
}
EXPORT_SYMBOL(cfg80211_unregister_wdev);
static const struct device_type wiphy_type = {
.name = "wlan",
};
void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype, int num)
{
ASSERT_RTNL();
rdev->num_running_ifaces += num;
if (iftype == NL80211_IFTYPE_MONITOR)
rdev->num_running_monitor_ifaces += num;
}
void __cfg80211_leave(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev)
{
struct net_device *dev = wdev->netdev;
struct cfg80211_sched_scan_request *pos, *tmp;
ASSERT_RTNL();
ASSERT_WDEV_LOCK(wdev);
cfg80211_pmsr_wdev_down(wdev);
switch (wdev->iftype) {
case NL80211_IFTYPE_ADHOC:
__cfg80211_leave_ibss(rdev, dev, true);
break;
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_STATION:
list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
list) {
if (dev == pos->dev)
cfg80211_stop_sched_scan_req(rdev, pos, false);
}
#ifdef CONFIG_CFG80211_WEXT
kfree(wdev->wext.ie);
wdev->wext.ie = NULL;
wdev->wext.ie_len = 0;
wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif
cfg80211_disconnect(rdev, dev,
WLAN_REASON_DEAUTH_LEAVING, true);
break;
case NL80211_IFTYPE_MESH_POINT:
__cfg80211_leave_mesh(rdev, dev);
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
__cfg80211_stop_ap(rdev, dev, true);
break;
case NL80211_IFTYPE_OCB:
__cfg80211_leave_ocb(rdev, dev);
break;
case NL80211_IFTYPE_WDS:
/* must be handled by mac80211/driver, has no APIs */
break;
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
/* cannot happen, has no netdev */
break;
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MONITOR:
/* nothing to do */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
/* invalid */
break;
}
}
void cfg80211_leave(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev)
{
wdev_lock(wdev);
__cfg80211_leave(rdev, wdev);
wdev_unlock(wdev);
}
void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
gfp_t gfp)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct cfg80211_event *ev;
unsigned long flags;
trace_cfg80211_stop_iface(wiphy, wdev);
ev = kzalloc(sizeof(*ev), gfp);
if (!ev)
return;
ev->type = EVENT_STOPPED;
spin_lock_irqsave(&wdev->event_lock, flags);
list_add_tail(&ev->list, &wdev->event_list);
spin_unlock_irqrestore(&wdev->event_lock, flags);
queue_work(cfg80211_wq, &rdev->event_work);
}
EXPORT_SYMBOL(cfg80211_stop_iface);
void cfg80211_init_wdev(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev)
{
mutex_init(&wdev->mtx);
INIT_LIST_HEAD(&wdev->event_list);
spin_lock_init(&wdev->event_lock);
INIT_LIST_HEAD(&wdev->mgmt_registrations);
spin_lock_init(&wdev->mgmt_registrations_lock);
INIT_LIST_HEAD(&wdev->pmsr_list);
spin_lock_init(&wdev->pmsr_lock);
INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
/*
* We get here also when the interface changes network namespaces,
* as it's registered into the new one, but we don't want it to
* change ID in that case. Checking if the ID is already assigned
* works, because 0 isn't considered a valid ID and the memory is
* 0-initialized.
*/
if (!wdev->identifier)
wdev->identifier = ++rdev->wdev_id;
list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
rdev->devlist_generation++;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
}
static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
unsigned long state, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev;
struct cfg80211_sched_scan_request *pos, *tmp;
if (!wdev)
return NOTIFY_DONE;
rdev = wiphy_to_rdev(wdev->wiphy);
WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
switch (state) {
case NETDEV_POST_INIT:
SET_NETDEV_DEVTYPE(dev, &wiphy_type);
break;
case NETDEV_REGISTER:
/*
* NB: cannot take rdev->mtx here because this may be
* called within code protected by it when interfaces
* are added with nl80211.
*/
/* can only change netns with wiphy */
dev->features |= NETIF_F_NETNS_LOCAL;
if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
"phy80211")) {
pr_err("failed to add phy80211 symlink to netdev!\n");
}
wdev->netdev = dev;
#ifdef CONFIG_CFG80211_WEXT
wdev->wext.default_key = -1;
wdev->wext.default_mgmt_key = -1;
wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif
if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
wdev->ps = true;
else
wdev->ps = false;
/* allow mac80211 to determine the timeout */
wdev->ps_timeout = -1;
if ((wdev->iftype == NL80211_IFTYPE_STATION ||
wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
dev->priv_flags |= IFF_DONT_BRIDGE;
INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
cfg80211_init_wdev(rdev, wdev);
break;
case NETDEV_GOING_DOWN:
cfg80211_leave(rdev, wdev);
break;
case NETDEV_DOWN:
cfg80211_update_iface_num(rdev, wdev->iftype, -1);
if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
if (WARN_ON(!rdev->scan_req->notified))
rdev->scan_req->info.aborted = true;
___cfg80211_scan_done(rdev, false);
}
list_for_each_entry_safe(pos, tmp,
&rdev->sched_scan_req_list, list) {
if (WARN_ON(pos->dev == wdev->netdev))
cfg80211_stop_sched_scan_req(rdev, pos, false);
}
rdev->opencount--;
wake_up(&rdev->dev_wait);
break;
case NETDEV_UP:
cfg80211_update_iface_num(rdev, wdev->iftype, 1);
wdev_lock(wdev);
switch (wdev->iftype) {
#ifdef CONFIG_CFG80211_WEXT
case NL80211_IFTYPE_ADHOC:
cfg80211_ibss_wext_join(rdev, wdev);
break;
case NL80211_IFTYPE_STATION:
cfg80211_mgd_wext_connect(rdev, wdev);
break;
#endif
#ifdef CONFIG_MAC80211_MESH
case NL80211_IFTYPE_MESH_POINT:
{
/* 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
default:
break;
}
wdev_unlock(wdev);
rdev->opencount++;
/*
* Configure power management to the driver here so that its
* correctly set also after interface type changes etc.
*/
if ((wdev->iftype == NL80211_IFTYPE_STATION ||
wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
rdev->ops->set_power_mgmt &&
rdev_set_power_mgmt(rdev, dev, wdev->ps,
wdev->ps_timeout)) {
/* assume this means it's off */
wdev->ps = false;
}
break;
case NETDEV_UNREGISTER:
/*
* 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.
*/
if (!list_empty(&wdev->list)) {
__cfg80211_unregister_wdev(wdev, false);
sysfs_remove_link(&dev->dev.kobj, "phy80211");
}
/*
* 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);
/*
* Ensure that all events have been processed and
* freed.
*/
cfg80211_process_wdev_events(wdev);
if (WARN_ON(wdev->current_bss)) {
cfg80211_unhold_bss(wdev->current_bss);
cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
wdev->current_bss = NULL;
}
break;
case NETDEV_PRE_UP:
if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
return notifier_from_errno(-EOPNOTSUPP);
if (rfkill_blocked(rdev->rfkill))
return notifier_from_errno(-ERFKILL);
break;
default:
return NOTIFY_DONE;
}
wireless_nlevent_flush();
return NOTIFY_OK;
}
static struct notifier_block cfg80211_netdev_notifier = {
.notifier_call = cfg80211_netdev_notifier_call,
};
static void __net_exit cfg80211_pernet_exit(struct net *net)
{
struct cfg80211_registered_device *rdev;
rtnl_lock();
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));
}
rtnl_unlock();
}
static struct pernet_operations cfg80211_pernet_ops = {
.exit = cfg80211_pernet_exit,
};
static int __init cfg80211_init(void)
{
int err;
err = register_pernet_device(&cfg80211_pernet_ops);
if (err)
goto out_fail_pernet;
err = wiphy_sysfs_init();
if (err)
goto out_fail_sysfs;
err = register_netdevice_notifier(&cfg80211_netdev_notifier);
if (err)
goto out_fail_notifier;
err = nl80211_init();
if (err)
goto out_fail_nl80211;
ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
err = regulatory_init();
if (err)
goto out_fail_reg;
cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
if (!cfg80211_wq) {
err = -ENOMEM;
goto out_fail_wq;
}
return 0;
out_fail_wq:
regulatory_exit();
out_fail_reg:
debugfs_remove(ieee80211_debugfs_dir);
nl80211_exit();
out_fail_nl80211:
unregister_netdevice_notifier(&cfg80211_netdev_notifier);
out_fail_notifier:
wiphy_sysfs_exit();
out_fail_sysfs:
unregister_pernet_device(&cfg80211_pernet_ops);
out_fail_pernet:
return err;
}
fs_initcall(cfg80211_init);
static void __exit cfg80211_exit(void)
{
debugfs_remove(ieee80211_debugfs_dir);
nl80211_exit();
unregister_netdevice_notifier(&cfg80211_netdev_notifier);
wiphy_sysfs_exit();
regulatory_exit();
unregister_pernet_device(&cfg80211_pernet_ops);
destroy_workqueue(cfg80211_wq);
}
module_exit(cfg80211_exit);
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