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linux/net/wireless/core.c

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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 Intel Deutschland GmbH
*/
#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();
/* 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;
}
wiphy_net_set(&rdev->wiphy, net);
err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
WARN_ON(err);
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 {
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?
*/
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
}
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 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 (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++) {
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;
}
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;
}
void cfg80211_unregister_wdev(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
ASSERT_RTNL();
if (WARN_ON(wdev->netdev))
return;
nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
list_del_rcu(&wdev->list);
rdev->devlist_generation++;
switch (wdev->iftype) {
case NL80211_IFTYPE_P2P_DEVICE:
cfg80211_mlme_purge_registrations(wdev);
cfg80211_stop_p2p_device(rdev, wdev);
break;
case NL80211_IFTYPE_NAN:
cfg80211_stop_nan(rdev, wdev);
break;
default:
WARN_ON_ONCE(1);
break;
}
cfg80211_cqm_config_free(wdev);
}
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);
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);
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.
*/
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);
/*
* 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++;
/* 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);
nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
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 && 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)) {
nl80211_notify_iface(rdev, wdev,
NL80211_CMD_DEL_INTERFACE);
sysfs_remove_link(&dev->dev.kobj, "phy80211");
list_del_rcu(&wdev->list);
rdev->devlist_generation++;
cfg80211_mlme_purge_registrations(wdev);
#ifdef CONFIG_CFG80211_WEXT
kzfree(wdev->wext.keys);
#endif
flush_work(&wdev->disconnect_wk);
cfg80211_cqm_config_free(wdev);
}
/*
* 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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