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990de49f74
When a full scan 2.4 and 5 GHz scan is scheduled, but then the 2.4 GHz part of the scan disables a 5.2 GHz channel due to, e.g. receiving country or frequency information, that 5.2 GHz channel might already be in the list of channels to scan next. Then, when the driver checks if it should do a passive scan, that will return false and attempt an active scan. This is not only wrong but can also lead to the iwlwifi device firmware crashing since it checks regulatory as well. Fix this by not setting the channel flags to just disabled but rather OR'ing in the disabled flag. That way, even if the race happens, the channel will be scanned passively which is still (mostly) correct. Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2411 lines
64 KiB
C
2411 lines
64 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* DOC: Wireless regulatory infrastructure
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*
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* The usual implementation is for a driver to read a device EEPROM to
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* determine which regulatory domain it should be operating under, then
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* looking up the allowable channels in a driver-local table and finally
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* registering those channels in the wiphy structure.
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*
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* Another set of compliance enforcement is for drivers to use their
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* own compliance limits which can be stored on the EEPROM. The host
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* driver or firmware may ensure these are used.
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*
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* In addition to all this we provide an extra layer of regulatory
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* conformance. For drivers which do not have any regulatory
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* information CRDA provides the complete regulatory solution.
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* For others it provides a community effort on further restrictions
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* to enhance compliance.
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*
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* Note: When number of rules --> infinity we will not be able to
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* index on alpha2 any more, instead we'll probably have to
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* rely on some SHA1 checksum of the regdomain for example.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/nl80211.h>
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#include <linux/platform_device.h>
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#include <linux/moduleparam.h>
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#include <net/cfg80211.h>
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#include "core.h"
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#include "reg.h"
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#include "regdb.h"
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#include "nl80211.h"
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#ifdef CONFIG_CFG80211_REG_DEBUG
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#define REG_DBG_PRINT(format, args...) \
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printk(KERN_DEBUG pr_fmt(format), ##args)
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#else
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#define REG_DBG_PRINT(args...)
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#endif
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enum reg_request_treatment {
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REG_REQ_OK,
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REG_REQ_IGNORE,
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REG_REQ_INTERSECT,
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REG_REQ_ALREADY_SET,
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};
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static struct regulatory_request core_request_world = {
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.initiator = NL80211_REGDOM_SET_BY_CORE,
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.alpha2[0] = '0',
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.alpha2[1] = '0',
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.intersect = false,
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.processed = true,
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.country_ie_env = ENVIRON_ANY,
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};
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/* Receipt of information from last regulatory request */
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static struct regulatory_request __rcu *last_request =
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(void __rcu *)&core_request_world;
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/* To trigger userspace events */
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static struct platform_device *reg_pdev;
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static struct device_type reg_device_type = {
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.uevent = reg_device_uevent,
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};
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/*
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* Central wireless core regulatory domains, we only need two,
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* the current one and a world regulatory domain in case we have no
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* information to give us an alpha2.
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*/
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const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
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/*
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* Protects static reg.c components:
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* - cfg80211_regdomain (if not used with RCU)
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* - cfg80211_world_regdom
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* - last_request (if not used with RCU)
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* - reg_num_devs_support_basehint
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*/
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static DEFINE_MUTEX(reg_mutex);
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/*
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* Number of devices that registered to the core
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* that support cellular base station regulatory hints
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*/
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static int reg_num_devs_support_basehint;
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static inline void assert_reg_lock(void)
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{
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lockdep_assert_held(®_mutex);
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}
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static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
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{
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return rcu_dereference_protected(cfg80211_regdomain,
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lockdep_is_held(®_mutex));
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}
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static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
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{
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return rcu_dereference_protected(wiphy->regd,
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lockdep_is_held(®_mutex));
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}
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static void rcu_free_regdom(const struct ieee80211_regdomain *r)
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{
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if (!r)
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return;
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kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
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}
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static struct regulatory_request *get_last_request(void)
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{
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return rcu_dereference_check(last_request,
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lockdep_is_held(®_mutex));
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}
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/* Used to queue up regulatory hints */
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static LIST_HEAD(reg_requests_list);
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static spinlock_t reg_requests_lock;
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/* Used to queue up beacon hints for review */
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static LIST_HEAD(reg_pending_beacons);
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static spinlock_t reg_pending_beacons_lock;
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/* Used to keep track of processed beacon hints */
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static LIST_HEAD(reg_beacon_list);
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struct reg_beacon {
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struct list_head list;
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struct ieee80211_channel chan;
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};
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static void reg_todo(struct work_struct *work);
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static DECLARE_WORK(reg_work, reg_todo);
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static void reg_timeout_work(struct work_struct *work);
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static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
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/* We keep a static world regulatory domain in case of the absence of CRDA */
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static const struct ieee80211_regdomain world_regdom = {
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.n_reg_rules = 6,
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.alpha2 = "00",
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.reg_rules = {
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/* IEEE 802.11b/g, channels 1..11 */
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REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
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/* IEEE 802.11b/g, channels 12..13. */
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REG_RULE(2467-10, 2472+10, 40, 6, 20,
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NL80211_RRF_PASSIVE_SCAN |
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NL80211_RRF_NO_IBSS),
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/* IEEE 802.11 channel 14 - Only JP enables
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* this and for 802.11b only */
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REG_RULE(2484-10, 2484+10, 20, 6, 20,
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NL80211_RRF_PASSIVE_SCAN |
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NL80211_RRF_NO_IBSS |
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NL80211_RRF_NO_OFDM),
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/* IEEE 802.11a, channel 36..48 */
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REG_RULE(5180-10, 5240+10, 80, 6, 20,
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NL80211_RRF_PASSIVE_SCAN |
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NL80211_RRF_NO_IBSS),
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/* NB: 5260 MHz - 5700 MHz requires DFS */
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/* IEEE 802.11a, channel 149..165 */
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REG_RULE(5745-10, 5825+10, 80, 6, 20,
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NL80211_RRF_PASSIVE_SCAN |
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NL80211_RRF_NO_IBSS),
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/* IEEE 802.11ad (60gHz), channels 1..3 */
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REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
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}
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};
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static const struct ieee80211_regdomain *cfg80211_world_regdom =
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&world_regdom;
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static char *ieee80211_regdom = "00";
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static char user_alpha2[2];
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module_param(ieee80211_regdom, charp, 0444);
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MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
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static void reset_regdomains(bool full_reset,
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const struct ieee80211_regdomain *new_regdom)
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{
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const struct ieee80211_regdomain *r;
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struct regulatory_request *lr;
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assert_reg_lock();
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r = get_cfg80211_regdom();
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/* avoid freeing static information or freeing something twice */
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if (r == cfg80211_world_regdom)
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r = NULL;
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if (cfg80211_world_regdom == &world_regdom)
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cfg80211_world_regdom = NULL;
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if (r == &world_regdom)
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r = NULL;
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rcu_free_regdom(r);
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rcu_free_regdom(cfg80211_world_regdom);
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cfg80211_world_regdom = &world_regdom;
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rcu_assign_pointer(cfg80211_regdomain, new_regdom);
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if (!full_reset)
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return;
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lr = get_last_request();
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if (lr != &core_request_world && lr)
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kfree_rcu(lr, rcu_head);
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rcu_assign_pointer(last_request, &core_request_world);
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}
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/*
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* Dynamic world regulatory domain requested by the wireless
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* core upon initialization
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*/
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static void update_world_regdomain(const struct ieee80211_regdomain *rd)
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{
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struct regulatory_request *lr;
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lr = get_last_request();
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WARN_ON(!lr);
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reset_regdomains(false, rd);
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cfg80211_world_regdom = rd;
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}
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bool is_world_regdom(const char *alpha2)
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{
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if (!alpha2)
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return false;
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return alpha2[0] == '0' && alpha2[1] == '0';
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}
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static bool is_alpha2_set(const char *alpha2)
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{
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if (!alpha2)
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return false;
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return alpha2[0] && alpha2[1];
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}
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static bool is_unknown_alpha2(const char *alpha2)
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{
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if (!alpha2)
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return false;
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/*
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* Special case where regulatory domain was built by driver
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* but a specific alpha2 cannot be determined
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*/
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return alpha2[0] == '9' && alpha2[1] == '9';
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}
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static bool is_intersected_alpha2(const char *alpha2)
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{
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if (!alpha2)
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return false;
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/*
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* Special case where regulatory domain is the
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* result of an intersection between two regulatory domain
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* structures
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*/
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return alpha2[0] == '9' && alpha2[1] == '8';
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}
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static bool is_an_alpha2(const char *alpha2)
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{
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if (!alpha2)
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return false;
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return isalpha(alpha2[0]) && isalpha(alpha2[1]);
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}
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static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
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{
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if (!alpha2_x || !alpha2_y)
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return false;
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return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
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}
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static bool regdom_changes(const char *alpha2)
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{
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const struct ieee80211_regdomain *r = get_cfg80211_regdom();
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if (!r)
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return true;
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return !alpha2_equal(r->alpha2, alpha2);
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}
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/*
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* The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
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* you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
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* has ever been issued.
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*/
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static bool is_user_regdom_saved(void)
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{
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if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
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return false;
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/* This would indicate a mistake on the design */
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if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
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"Unexpected user alpha2: %c%c\n",
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user_alpha2[0], user_alpha2[1]))
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return false;
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return true;
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}
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static const struct ieee80211_regdomain *
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reg_copy_regd(const struct ieee80211_regdomain *src_regd)
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{
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struct ieee80211_regdomain *regd;
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int size_of_regd;
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unsigned int i;
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size_of_regd =
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sizeof(struct ieee80211_regdomain) +
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src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);
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regd = kzalloc(size_of_regd, GFP_KERNEL);
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if (!regd)
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return ERR_PTR(-ENOMEM);
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memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
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for (i = 0; i < src_regd->n_reg_rules; i++)
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memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
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sizeof(struct ieee80211_reg_rule));
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return regd;
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}
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#ifdef CONFIG_CFG80211_INTERNAL_REGDB
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struct reg_regdb_search_request {
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char alpha2[2];
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struct list_head list;
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};
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static LIST_HEAD(reg_regdb_search_list);
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static DEFINE_MUTEX(reg_regdb_search_mutex);
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static void reg_regdb_search(struct work_struct *work)
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{
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struct reg_regdb_search_request *request;
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const struct ieee80211_regdomain *curdom, *regdom = NULL;
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int i;
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mutex_lock(&cfg80211_mutex);
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mutex_lock(®_regdb_search_mutex);
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while (!list_empty(®_regdb_search_list)) {
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request = list_first_entry(®_regdb_search_list,
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struct reg_regdb_search_request,
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list);
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list_del(&request->list);
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for (i = 0; i < reg_regdb_size; i++) {
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curdom = reg_regdb[i];
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if (alpha2_equal(request->alpha2, curdom->alpha2)) {
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regdom = reg_copy_regd(curdom);
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break;
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}
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}
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kfree(request);
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}
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mutex_unlock(®_regdb_search_mutex);
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if (!IS_ERR_OR_NULL(regdom))
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set_regdom(regdom);
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mutex_unlock(&cfg80211_mutex);
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}
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static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
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static void reg_regdb_query(const char *alpha2)
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{
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struct reg_regdb_search_request *request;
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if (!alpha2)
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return;
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request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
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if (!request)
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return;
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memcpy(request->alpha2, alpha2, 2);
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mutex_lock(®_regdb_search_mutex);
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list_add_tail(&request->list, ®_regdb_search_list);
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mutex_unlock(®_regdb_search_mutex);
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schedule_work(®_regdb_work);
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}
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/* Feel free to add any other sanity checks here */
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static void reg_regdb_size_check(void)
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{
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/* We should ideally BUILD_BUG_ON() but then random builds would fail */
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WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
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}
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#else
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static inline void reg_regdb_size_check(void) {}
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static inline void reg_regdb_query(const char *alpha2) {}
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#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
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/*
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* This lets us keep regulatory code which is updated on a regulatory
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* basis in userspace. Country information is filled in by
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* reg_device_uevent
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*/
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static int call_crda(const char *alpha2)
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{
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if (!is_world_regdom((char *) alpha2))
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pr_info("Calling CRDA for country: %c%c\n",
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alpha2[0], alpha2[1]);
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else
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pr_info("Calling CRDA to update world regulatory domain\n");
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/* query internal regulatory database (if it exists) */
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reg_regdb_query(alpha2);
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return kobject_uevent(®_pdev->dev.kobj, KOBJ_CHANGE);
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}
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static bool reg_is_valid_request(const char *alpha2)
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{
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struct regulatory_request *lr = get_last_request();
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if (!lr || lr->processed)
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return false;
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return alpha2_equal(lr->alpha2, alpha2);
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}
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|
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/* Sanity check on a regulatory rule */
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static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
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{
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const struct ieee80211_freq_range *freq_range = &rule->freq_range;
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u32 freq_diff;
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|
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if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
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return false;
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|
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if (freq_range->start_freq_khz > freq_range->end_freq_khz)
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return false;
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freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
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|
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if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
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freq_range->max_bandwidth_khz > freq_diff)
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return false;
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|
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return true;
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}
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|
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static bool is_valid_rd(const struct ieee80211_regdomain *rd)
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{
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const struct ieee80211_reg_rule *reg_rule = NULL;
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unsigned int i;
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|
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if (!rd->n_reg_rules)
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return false;
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|
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if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
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return false;
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|
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for (i = 0; i < rd->n_reg_rules; i++) {
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reg_rule = &rd->reg_rules[i];
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if (!is_valid_reg_rule(reg_rule))
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return false;
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}
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return true;
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}
|
|
|
|
static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
|
|
u32 center_freq_khz, u32 bw_khz)
|
|
{
|
|
u32 start_freq_khz, end_freq_khz;
|
|
|
|
start_freq_khz = center_freq_khz - (bw_khz/2);
|
|
end_freq_khz = center_freq_khz + (bw_khz/2);
|
|
|
|
if (start_freq_khz >= freq_range->start_freq_khz &&
|
|
end_freq_khz <= freq_range->end_freq_khz)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* freq_in_rule_band - tells us if a frequency is in a frequency band
|
|
* @freq_range: frequency rule we want to query
|
|
* @freq_khz: frequency we are inquiring about
|
|
*
|
|
* This lets us know if a specific frequency rule is or is not relevant to
|
|
* a specific frequency's band. Bands are device specific and artificial
|
|
* definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
|
|
* however it is safe for now to assume that a frequency rule should not be
|
|
* part of a frequency's band if the start freq or end freq are off by more
|
|
* than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
|
|
* 60 GHz band.
|
|
* This resolution can be lowered and should be considered as we add
|
|
* regulatory rule support for other "bands".
|
|
**/
|
|
static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
|
|
u32 freq_khz)
|
|
{
|
|
#define ONE_GHZ_IN_KHZ 1000000
|
|
/*
|
|
* From 802.11ad: directional multi-gigabit (DMG):
|
|
* Pertaining to operation in a frequency band containing a channel
|
|
* with the Channel starting frequency above 45 GHz.
|
|
*/
|
|
u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
|
|
10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
|
|
if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
|
|
return true;
|
|
if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
|
|
return true;
|
|
return false;
|
|
#undef ONE_GHZ_IN_KHZ
|
|
}
|
|
|
|
/*
|
|
* Helper for regdom_intersect(), this does the real
|
|
* mathematical intersection fun
|
|
*/
|
|
static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1,
|
|
const struct ieee80211_reg_rule *rule2,
|
|
struct ieee80211_reg_rule *intersected_rule)
|
|
{
|
|
const struct ieee80211_freq_range *freq_range1, *freq_range2;
|
|
struct ieee80211_freq_range *freq_range;
|
|
const struct ieee80211_power_rule *power_rule1, *power_rule2;
|
|
struct ieee80211_power_rule *power_rule;
|
|
u32 freq_diff;
|
|
|
|
freq_range1 = &rule1->freq_range;
|
|
freq_range2 = &rule2->freq_range;
|
|
freq_range = &intersected_rule->freq_range;
|
|
|
|
power_rule1 = &rule1->power_rule;
|
|
power_rule2 = &rule2->power_rule;
|
|
power_rule = &intersected_rule->power_rule;
|
|
|
|
freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
|
|
freq_range2->start_freq_khz);
|
|
freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
|
|
freq_range2->end_freq_khz);
|
|
freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
|
|
freq_range2->max_bandwidth_khz);
|
|
|
|
freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
|
|
if (freq_range->max_bandwidth_khz > freq_diff)
|
|
freq_range->max_bandwidth_khz = freq_diff;
|
|
|
|
power_rule->max_eirp = min(power_rule1->max_eirp,
|
|
power_rule2->max_eirp);
|
|
power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
|
|
power_rule2->max_antenna_gain);
|
|
|
|
intersected_rule->flags = rule1->flags | rule2->flags;
|
|
|
|
if (!is_valid_reg_rule(intersected_rule))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* regdom_intersect - do the intersection between two regulatory domains
|
|
* @rd1: first regulatory domain
|
|
* @rd2: second regulatory domain
|
|
*
|
|
* Use this function to get the intersection between two regulatory domains.
|
|
* Once completed we will mark the alpha2 for the rd as intersected, "98",
|
|
* as no one single alpha2 can represent this regulatory domain.
|
|
*
|
|
* Returns a pointer to the regulatory domain structure which will hold the
|
|
* resulting intersection of rules between rd1 and rd2. We will
|
|
* kzalloc() this structure for you.
|
|
*/
|
|
static struct ieee80211_regdomain *
|
|
regdom_intersect(const struct ieee80211_regdomain *rd1,
|
|
const struct ieee80211_regdomain *rd2)
|
|
{
|
|
int r, size_of_regd;
|
|
unsigned int x, y;
|
|
unsigned int num_rules = 0, rule_idx = 0;
|
|
const struct ieee80211_reg_rule *rule1, *rule2;
|
|
struct ieee80211_reg_rule *intersected_rule;
|
|
struct ieee80211_regdomain *rd;
|
|
/* This is just a dummy holder to help us count */
|
|
struct ieee80211_reg_rule dummy_rule;
|
|
|
|
if (!rd1 || !rd2)
|
|
return NULL;
|
|
|
|
/*
|
|
* First we get a count of the rules we'll need, then we actually
|
|
* build them. This is to so we can malloc() and free() a
|
|
* regdomain once. The reason we use reg_rules_intersect() here
|
|
* is it will return -EINVAL if the rule computed makes no sense.
|
|
* All rules that do check out OK are valid.
|
|
*/
|
|
|
|
for (x = 0; x < rd1->n_reg_rules; x++) {
|
|
rule1 = &rd1->reg_rules[x];
|
|
for (y = 0; y < rd2->n_reg_rules; y++) {
|
|
rule2 = &rd2->reg_rules[y];
|
|
if (!reg_rules_intersect(rule1, rule2, &dummy_rule))
|
|
num_rules++;
|
|
}
|
|
}
|
|
|
|
if (!num_rules)
|
|
return NULL;
|
|
|
|
size_of_regd = sizeof(struct ieee80211_regdomain) +
|
|
num_rules * sizeof(struct ieee80211_reg_rule);
|
|
|
|
rd = kzalloc(size_of_regd, GFP_KERNEL);
|
|
if (!rd)
|
|
return NULL;
|
|
|
|
for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) {
|
|
rule1 = &rd1->reg_rules[x];
|
|
for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) {
|
|
rule2 = &rd2->reg_rules[y];
|
|
/*
|
|
* This time around instead of using the stack lets
|
|
* write to the target rule directly saving ourselves
|
|
* a memcpy()
|
|
*/
|
|
intersected_rule = &rd->reg_rules[rule_idx];
|
|
r = reg_rules_intersect(rule1, rule2, intersected_rule);
|
|
/*
|
|
* No need to memset here the intersected rule here as
|
|
* we're not using the stack anymore
|
|
*/
|
|
if (r)
|
|
continue;
|
|
rule_idx++;
|
|
}
|
|
}
|
|
|
|
if (rule_idx != num_rules) {
|
|
kfree(rd);
|
|
return NULL;
|
|
}
|
|
|
|
rd->n_reg_rules = num_rules;
|
|
rd->alpha2[0] = '9';
|
|
rd->alpha2[1] = '8';
|
|
|
|
return rd;
|
|
}
|
|
|
|
/*
|
|
* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
|
|
* want to just have the channel structure use these
|
|
*/
|
|
static u32 map_regdom_flags(u32 rd_flags)
|
|
{
|
|
u32 channel_flags = 0;
|
|
if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
|
|
channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
|
|
if (rd_flags & NL80211_RRF_NO_IBSS)
|
|
channel_flags |= IEEE80211_CHAN_NO_IBSS;
|
|
if (rd_flags & NL80211_RRF_DFS)
|
|
channel_flags |= IEEE80211_CHAN_RADAR;
|
|
if (rd_flags & NL80211_RRF_NO_OFDM)
|
|
channel_flags |= IEEE80211_CHAN_NO_OFDM;
|
|
return channel_flags;
|
|
}
|
|
|
|
static const struct ieee80211_reg_rule *
|
|
freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq,
|
|
const struct ieee80211_regdomain *regd)
|
|
{
|
|
int i;
|
|
bool band_rule_found = false;
|
|
bool bw_fits = false;
|
|
|
|
if (!regd)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
for (i = 0; i < regd->n_reg_rules; i++) {
|
|
const struct ieee80211_reg_rule *rr;
|
|
const struct ieee80211_freq_range *fr = NULL;
|
|
|
|
rr = ®d->reg_rules[i];
|
|
fr = &rr->freq_range;
|
|
|
|
/*
|
|
* We only need to know if one frequency rule was
|
|
* was in center_freq's band, that's enough, so lets
|
|
* not overwrite it once found
|
|
*/
|
|
if (!band_rule_found)
|
|
band_rule_found = freq_in_rule_band(fr, center_freq);
|
|
|
|
bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20));
|
|
|
|
if (band_rule_found && bw_fits)
|
|
return rr;
|
|
}
|
|
|
|
if (!band_rule_found)
|
|
return ERR_PTR(-ERANGE);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
|
|
u32 center_freq)
|
|
{
|
|
const struct ieee80211_regdomain *regd;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
/*
|
|
* Follow the driver's regulatory domain, if present, unless a country
|
|
* IE has been processed or a user wants to help complaince further
|
|
*/
|
|
if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
lr->initiator != NL80211_REGDOM_SET_BY_USER &&
|
|
wiphy->regd)
|
|
regd = get_wiphy_regdom(wiphy);
|
|
else
|
|
regd = get_cfg80211_regdom();
|
|
|
|
return freq_reg_info_regd(wiphy, center_freq, regd);
|
|
}
|
|
EXPORT_SYMBOL(freq_reg_info);
|
|
|
|
#ifdef CONFIG_CFG80211_REG_DEBUG
|
|
static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
|
|
{
|
|
switch (initiator) {
|
|
case NL80211_REGDOM_SET_BY_CORE:
|
|
return "Set by core";
|
|
case NL80211_REGDOM_SET_BY_USER:
|
|
return "Set by user";
|
|
case NL80211_REGDOM_SET_BY_DRIVER:
|
|
return "Set by driver";
|
|
case NL80211_REGDOM_SET_BY_COUNTRY_IE:
|
|
return "Set by country IE";
|
|
default:
|
|
WARN_ON(1);
|
|
return "Set by bug";
|
|
}
|
|
}
|
|
|
|
static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
|
|
const struct ieee80211_reg_rule *reg_rule)
|
|
{
|
|
const struct ieee80211_power_rule *power_rule;
|
|
const struct ieee80211_freq_range *freq_range;
|
|
char max_antenna_gain[32];
|
|
|
|
power_rule = ®_rule->power_rule;
|
|
freq_range = ®_rule->freq_range;
|
|
|
|
if (!power_rule->max_antenna_gain)
|
|
snprintf(max_antenna_gain, 32, "N/A");
|
|
else
|
|
snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
|
|
|
|
REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
|
|
chan->center_freq);
|
|
|
|
REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
|
|
freq_range->start_freq_khz, freq_range->end_freq_khz,
|
|
freq_range->max_bandwidth_khz, max_antenna_gain,
|
|
power_rule->max_eirp);
|
|
}
|
|
#else
|
|
static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
|
|
const struct ieee80211_reg_rule *reg_rule)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Note that right now we assume the desired channel bandwidth
|
|
* is always 20 MHz for each individual channel (HT40 uses 20 MHz
|
|
* per channel, the primary and the extension channel).
|
|
*/
|
|
static void handle_channel(struct wiphy *wiphy,
|
|
enum nl80211_reg_initiator initiator,
|
|
struct ieee80211_channel *chan)
|
|
{
|
|
u32 flags, bw_flags = 0;
|
|
const struct ieee80211_reg_rule *reg_rule = NULL;
|
|
const struct ieee80211_power_rule *power_rule = NULL;
|
|
const struct ieee80211_freq_range *freq_range = NULL;
|
|
struct wiphy *request_wiphy = NULL;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
|
|
|
|
flags = chan->orig_flags;
|
|
|
|
reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq));
|
|
if (IS_ERR(reg_rule)) {
|
|
/*
|
|
* We will disable all channels that do not match our
|
|
* received regulatory rule unless the hint is coming
|
|
* from a Country IE and the Country IE had no information
|
|
* about a band. The IEEE 802.11 spec allows for an AP
|
|
* to send only a subset of the regulatory rules allowed,
|
|
* so an AP in the US that only supports 2.4 GHz may only send
|
|
* a country IE with information for the 2.4 GHz band
|
|
* while 5 GHz is still supported.
|
|
*/
|
|
if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
PTR_ERR(reg_rule) == -ERANGE)
|
|
return;
|
|
|
|
REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
|
|
chan->flags |= IEEE80211_CHAN_DISABLED;
|
|
return;
|
|
}
|
|
|
|
chan_reg_rule_print_dbg(chan, reg_rule);
|
|
|
|
power_rule = ®_rule->power_rule;
|
|
freq_range = ®_rule->freq_range;
|
|
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
|
|
bw_flags = IEEE80211_CHAN_NO_HT40;
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
|
|
bw_flags |= IEEE80211_CHAN_NO_80MHZ;
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
|
|
bw_flags |= IEEE80211_CHAN_NO_160MHZ;
|
|
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
|
|
request_wiphy && request_wiphy == wiphy &&
|
|
request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
|
|
/*
|
|
* This guarantees the driver's requested regulatory domain
|
|
* will always be used as a base for further regulatory
|
|
* settings
|
|
*/
|
|
chan->flags = chan->orig_flags =
|
|
map_regdom_flags(reg_rule->flags) | bw_flags;
|
|
chan->max_antenna_gain = chan->orig_mag =
|
|
(int) MBI_TO_DBI(power_rule->max_antenna_gain);
|
|
chan->max_reg_power = chan->max_power = chan->orig_mpwr =
|
|
(int) MBM_TO_DBM(power_rule->max_eirp);
|
|
return;
|
|
}
|
|
|
|
chan->dfs_state = NL80211_DFS_USABLE;
|
|
chan->dfs_state_entered = jiffies;
|
|
|
|
chan->beacon_found = false;
|
|
chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
|
|
chan->max_antenna_gain =
|
|
min_t(int, chan->orig_mag,
|
|
MBI_TO_DBI(power_rule->max_antenna_gain));
|
|
chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
|
|
if (chan->orig_mpwr) {
|
|
/*
|
|
* Devices that have their own custom regulatory domain
|
|
* but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
|
|
* passed country IE power settings.
|
|
*/
|
|
if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
|
|
wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
|
|
chan->max_power = chan->max_reg_power;
|
|
else
|
|
chan->max_power = min(chan->orig_mpwr,
|
|
chan->max_reg_power);
|
|
} else
|
|
chan->max_power = chan->max_reg_power;
|
|
}
|
|
|
|
static void handle_band(struct wiphy *wiphy,
|
|
enum nl80211_reg_initiator initiator,
|
|
struct ieee80211_supported_band *sband)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!sband)
|
|
return;
|
|
|
|
for (i = 0; i < sband->n_channels; i++)
|
|
handle_channel(wiphy, initiator, &sband->channels[i]);
|
|
}
|
|
|
|
static bool reg_request_cell_base(struct regulatory_request *request)
|
|
{
|
|
if (request->initiator != NL80211_REGDOM_SET_BY_USER)
|
|
return false;
|
|
return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
|
|
}
|
|
|
|
bool reg_last_request_cell_base(void)
|
|
{
|
|
bool val;
|
|
|
|
mutex_lock(®_mutex);
|
|
val = reg_request_cell_base(get_last_request());
|
|
mutex_unlock(®_mutex);
|
|
|
|
return val;
|
|
}
|
|
|
|
#ifdef CONFIG_CFG80211_CERTIFICATION_ONUS
|
|
/* Core specific check */
|
|
static enum reg_request_treatment
|
|
reg_ignore_cell_hint(struct regulatory_request *pending_request)
|
|
{
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
if (!reg_num_devs_support_basehint)
|
|
return REG_REQ_IGNORE;
|
|
|
|
if (reg_request_cell_base(lr) &&
|
|
!regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_ALREADY_SET;
|
|
|
|
return REG_REQ_OK;
|
|
}
|
|
|
|
/* Device specific check */
|
|
static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
|
|
{
|
|
return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
|
|
}
|
|
#else
|
|
static int reg_ignore_cell_hint(struct regulatory_request *pending_request)
|
|
{
|
|
return REG_REQ_IGNORE;
|
|
}
|
|
|
|
static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
|
|
{
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
|
|
static bool ignore_reg_update(struct wiphy *wiphy,
|
|
enum nl80211_reg_initiator initiator)
|
|
{
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
if (!lr) {
|
|
REG_DBG_PRINT("Ignoring regulatory request %s since last_request is not set\n",
|
|
reg_initiator_name(initiator));
|
|
return true;
|
|
}
|
|
|
|
if (initiator == NL80211_REGDOM_SET_BY_CORE &&
|
|
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
|
|
REG_DBG_PRINT("Ignoring regulatory request %s since the driver uses its own custom regulatory domain\n",
|
|
reg_initiator_name(initiator));
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* wiphy->regd will be set once the device has its own
|
|
* desired regulatory domain set
|
|
*/
|
|
if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
|
|
initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
!is_world_regdom(lr->alpha2)) {
|
|
REG_DBG_PRINT("Ignoring regulatory request %s since the driver requires its own regulatory domain to be set first\n",
|
|
reg_initiator_name(initiator));
|
|
return true;
|
|
}
|
|
|
|
if (reg_request_cell_base(lr))
|
|
return reg_dev_ignore_cell_hint(wiphy);
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool reg_is_world_roaming(struct wiphy *wiphy)
|
|
{
|
|
const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
|
|
const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
|
|
return true;
|
|
|
|
if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
|
|
struct reg_beacon *reg_beacon)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
struct ieee80211_channel *chan;
|
|
bool channel_changed = false;
|
|
struct ieee80211_channel chan_before;
|
|
|
|
sband = wiphy->bands[reg_beacon->chan.band];
|
|
chan = &sband->channels[chan_idx];
|
|
|
|
if (likely(chan->center_freq != reg_beacon->chan.center_freq))
|
|
return;
|
|
|
|
if (chan->beacon_found)
|
|
return;
|
|
|
|
chan->beacon_found = true;
|
|
|
|
if (!reg_is_world_roaming(wiphy))
|
|
return;
|
|
|
|
if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
|
|
return;
|
|
|
|
chan_before.center_freq = chan->center_freq;
|
|
chan_before.flags = chan->flags;
|
|
|
|
if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
|
|
chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
|
|
channel_changed = true;
|
|
}
|
|
|
|
if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
|
|
chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
|
|
channel_changed = true;
|
|
}
|
|
|
|
if (channel_changed)
|
|
nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
|
|
}
|
|
|
|
/*
|
|
* Called when a scan on a wiphy finds a beacon on
|
|
* new channel
|
|
*/
|
|
static void wiphy_update_new_beacon(struct wiphy *wiphy,
|
|
struct reg_beacon *reg_beacon)
|
|
{
|
|
unsigned int i;
|
|
struct ieee80211_supported_band *sband;
|
|
|
|
if (!wiphy->bands[reg_beacon->chan.band])
|
|
return;
|
|
|
|
sband = wiphy->bands[reg_beacon->chan.band];
|
|
|
|
for (i = 0; i < sband->n_channels; i++)
|
|
handle_reg_beacon(wiphy, i, reg_beacon);
|
|
}
|
|
|
|
/*
|
|
* Called upon reg changes or a new wiphy is added
|
|
*/
|
|
static void wiphy_update_beacon_reg(struct wiphy *wiphy)
|
|
{
|
|
unsigned int i;
|
|
struct ieee80211_supported_band *sband;
|
|
struct reg_beacon *reg_beacon;
|
|
|
|
list_for_each_entry(reg_beacon, ®_beacon_list, list) {
|
|
if (!wiphy->bands[reg_beacon->chan.band])
|
|
continue;
|
|
sband = wiphy->bands[reg_beacon->chan.band];
|
|
for (i = 0; i < sband->n_channels; i++)
|
|
handle_reg_beacon(wiphy, i, reg_beacon);
|
|
}
|
|
}
|
|
|
|
/* Reap the advantages of previously found beacons */
|
|
static void reg_process_beacons(struct wiphy *wiphy)
|
|
{
|
|
/*
|
|
* Means we are just firing up cfg80211, so no beacons would
|
|
* have been processed yet.
|
|
*/
|
|
if (!last_request)
|
|
return;
|
|
wiphy_update_beacon_reg(wiphy);
|
|
}
|
|
|
|
static bool is_ht40_allowed(struct ieee80211_channel *chan)
|
|
{
|
|
if (!chan)
|
|
return false;
|
|
if (chan->flags & IEEE80211_CHAN_DISABLED)
|
|
return false;
|
|
/* This would happen when regulatory rules disallow HT40 completely */
|
|
if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static void reg_process_ht_flags_channel(struct wiphy *wiphy,
|
|
struct ieee80211_channel *channel)
|
|
{
|
|
struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
|
|
struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
|
|
unsigned int i;
|
|
|
|
if (!is_ht40_allowed(channel)) {
|
|
channel->flags |= IEEE80211_CHAN_NO_HT40;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We need to ensure the extension channels exist to
|
|
* be able to use HT40- or HT40+, this finds them (or not)
|
|
*/
|
|
for (i = 0; i < sband->n_channels; i++) {
|
|
struct ieee80211_channel *c = &sband->channels[i];
|
|
|
|
if (c->center_freq == (channel->center_freq - 20))
|
|
channel_before = c;
|
|
if (c->center_freq == (channel->center_freq + 20))
|
|
channel_after = c;
|
|
}
|
|
|
|
/*
|
|
* Please note that this assumes target bandwidth is 20 MHz,
|
|
* if that ever changes we also need to change the below logic
|
|
* to include that as well.
|
|
*/
|
|
if (!is_ht40_allowed(channel_before))
|
|
channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
|
|
else
|
|
channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
|
|
|
|
if (!is_ht40_allowed(channel_after))
|
|
channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
|
|
else
|
|
channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
|
|
}
|
|
|
|
static void reg_process_ht_flags_band(struct wiphy *wiphy,
|
|
struct ieee80211_supported_band *sband)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!sband)
|
|
return;
|
|
|
|
for (i = 0; i < sband->n_channels; i++)
|
|
reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
|
|
}
|
|
|
|
static void reg_process_ht_flags(struct wiphy *wiphy)
|
|
{
|
|
enum ieee80211_band band;
|
|
|
|
if (!wiphy)
|
|
return;
|
|
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
|
|
reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
|
|
}
|
|
|
|
static void wiphy_update_regulatory(struct wiphy *wiphy,
|
|
enum nl80211_reg_initiator initiator)
|
|
{
|
|
enum ieee80211_band band;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
if (ignore_reg_update(wiphy, initiator))
|
|
return;
|
|
|
|
lr->dfs_region = get_cfg80211_regdom()->dfs_region;
|
|
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
|
|
handle_band(wiphy, initiator, wiphy->bands[band]);
|
|
|
|
reg_process_beacons(wiphy);
|
|
reg_process_ht_flags(wiphy);
|
|
|
|
if (wiphy->reg_notifier)
|
|
wiphy->reg_notifier(wiphy, lr);
|
|
}
|
|
|
|
static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct wiphy *wiphy;
|
|
|
|
assert_cfg80211_lock();
|
|
|
|
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
|
|
wiphy = &rdev->wiphy;
|
|
wiphy_update_regulatory(wiphy, initiator);
|
|
/*
|
|
* Regulatory updates set by CORE are ignored for custom
|
|
* regulatory cards. Let us notify the changes to the driver,
|
|
* as some drivers used this to restore its orig_* reg domain.
|
|
*/
|
|
if (initiator == NL80211_REGDOM_SET_BY_CORE &&
|
|
wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
|
|
wiphy->reg_notifier)
|
|
wiphy->reg_notifier(wiphy, get_last_request());
|
|
}
|
|
}
|
|
|
|
static void handle_channel_custom(struct wiphy *wiphy,
|
|
struct ieee80211_channel *chan,
|
|
const struct ieee80211_regdomain *regd)
|
|
{
|
|
u32 bw_flags = 0;
|
|
const struct ieee80211_reg_rule *reg_rule = NULL;
|
|
const struct ieee80211_power_rule *power_rule = NULL;
|
|
const struct ieee80211_freq_range *freq_range = NULL;
|
|
|
|
reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
|
|
regd);
|
|
|
|
if (IS_ERR(reg_rule)) {
|
|
REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
|
|
chan->center_freq);
|
|
chan->flags = IEEE80211_CHAN_DISABLED;
|
|
return;
|
|
}
|
|
|
|
chan_reg_rule_print_dbg(chan, reg_rule);
|
|
|
|
power_rule = ®_rule->power_rule;
|
|
freq_range = ®_rule->freq_range;
|
|
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
|
|
bw_flags = IEEE80211_CHAN_NO_HT40;
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80))
|
|
bw_flags |= IEEE80211_CHAN_NO_80MHZ;
|
|
if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160))
|
|
bw_flags |= IEEE80211_CHAN_NO_160MHZ;
|
|
|
|
chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
|
|
chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
|
|
chan->max_reg_power = chan->max_power =
|
|
(int) MBM_TO_DBM(power_rule->max_eirp);
|
|
}
|
|
|
|
static void handle_band_custom(struct wiphy *wiphy,
|
|
struct ieee80211_supported_band *sband,
|
|
const struct ieee80211_regdomain *regd)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (!sband)
|
|
return;
|
|
|
|
for (i = 0; i < sband->n_channels; i++)
|
|
handle_channel_custom(wiphy, &sband->channels[i], regd);
|
|
}
|
|
|
|
/* Used by drivers prior to wiphy registration */
|
|
void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
|
|
const struct ieee80211_regdomain *regd)
|
|
{
|
|
enum ieee80211_band band;
|
|
unsigned int bands_set = 0;
|
|
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
|
|
if (!wiphy->bands[band])
|
|
continue;
|
|
handle_band_custom(wiphy, wiphy->bands[band], regd);
|
|
bands_set++;
|
|
}
|
|
|
|
/*
|
|
* no point in calling this if it won't have any effect
|
|
* on your device's supported bands.
|
|
*/
|
|
WARN_ON(!bands_set);
|
|
}
|
|
EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
|
|
|
|
/* This has the logic which determines when a new request
|
|
* should be ignored. */
|
|
static enum reg_request_treatment
|
|
get_reg_request_treatment(struct wiphy *wiphy,
|
|
struct regulatory_request *pending_request)
|
|
{
|
|
struct wiphy *last_wiphy = NULL;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
/* All initial requests are respected */
|
|
if (!lr)
|
|
return REG_REQ_OK;
|
|
|
|
switch (pending_request->initiator) {
|
|
case NL80211_REGDOM_SET_BY_CORE:
|
|
return REG_REQ_OK;
|
|
case NL80211_REGDOM_SET_BY_COUNTRY_IE:
|
|
if (reg_request_cell_base(lr)) {
|
|
/* Trust a Cell base station over the AP's country IE */
|
|
if (regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_IGNORE;
|
|
return REG_REQ_ALREADY_SET;
|
|
}
|
|
|
|
last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
|
|
|
|
if (unlikely(!is_an_alpha2(pending_request->alpha2)))
|
|
return -EINVAL;
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
|
|
if (last_wiphy != wiphy) {
|
|
/*
|
|
* Two cards with two APs claiming different
|
|
* Country IE alpha2s. We could
|
|
* intersect them, but that seems unlikely
|
|
* to be correct. Reject second one for now.
|
|
*/
|
|
if (regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_IGNORE;
|
|
return REG_REQ_ALREADY_SET;
|
|
}
|
|
/*
|
|
* Two consecutive Country IE hints on the same wiphy.
|
|
* This should be picked up early by the driver/stack
|
|
*/
|
|
if (WARN_ON(regdom_changes(pending_request->alpha2)))
|
|
return REG_REQ_OK;
|
|
return REG_REQ_ALREADY_SET;
|
|
}
|
|
return 0;
|
|
case NL80211_REGDOM_SET_BY_DRIVER:
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
|
|
if (regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_OK;
|
|
return REG_REQ_ALREADY_SET;
|
|
}
|
|
|
|
/*
|
|
* This would happen if you unplug and plug your card
|
|
* back in or if you add a new device for which the previously
|
|
* loaded card also agrees on the regulatory domain.
|
|
*/
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
|
|
!regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_ALREADY_SET;
|
|
|
|
return REG_REQ_INTERSECT;
|
|
case NL80211_REGDOM_SET_BY_USER:
|
|
if (reg_request_cell_base(pending_request))
|
|
return reg_ignore_cell_hint(pending_request);
|
|
|
|
if (reg_request_cell_base(lr))
|
|
return REG_REQ_IGNORE;
|
|
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
|
|
return REG_REQ_INTERSECT;
|
|
/*
|
|
* If the user knows better the user should set the regdom
|
|
* to their country before the IE is picked up
|
|
*/
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
|
|
lr->intersect)
|
|
return REG_REQ_IGNORE;
|
|
/*
|
|
* Process user requests only after previous user/driver/core
|
|
* requests have been processed
|
|
*/
|
|
if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
|
|
lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
|
|
lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
|
|
regdom_changes(lr->alpha2))
|
|
return REG_REQ_IGNORE;
|
|
|
|
if (!regdom_changes(pending_request->alpha2))
|
|
return REG_REQ_ALREADY_SET;
|
|
|
|
return REG_REQ_OK;
|
|
}
|
|
|
|
return REG_REQ_IGNORE;
|
|
}
|
|
|
|
static void reg_set_request_processed(void)
|
|
{
|
|
bool need_more_processing = false;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
lr->processed = true;
|
|
|
|
spin_lock(®_requests_lock);
|
|
if (!list_empty(®_requests_list))
|
|
need_more_processing = true;
|
|
spin_unlock(®_requests_lock);
|
|
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
|
|
cancel_delayed_work(®_timeout);
|
|
|
|
if (need_more_processing)
|
|
schedule_work(®_work);
|
|
}
|
|
|
|
/**
|
|
* __regulatory_hint - hint to the wireless core a regulatory domain
|
|
* @wiphy: if the hint comes from country information from an AP, this
|
|
* is required to be set to the wiphy that received the information
|
|
* @pending_request: the regulatory request currently being processed
|
|
*
|
|
* The Wireless subsystem can use this function to hint to the wireless core
|
|
* what it believes should be the current regulatory domain.
|
|
*
|
|
* Returns one of the different reg request treatment values.
|
|
*
|
|
* Caller must hold ®_mutex
|
|
*/
|
|
static enum reg_request_treatment
|
|
__regulatory_hint(struct wiphy *wiphy,
|
|
struct regulatory_request *pending_request)
|
|
{
|
|
const struct ieee80211_regdomain *regd;
|
|
bool intersect = false;
|
|
enum reg_request_treatment treatment;
|
|
struct regulatory_request *lr;
|
|
|
|
treatment = get_reg_request_treatment(wiphy, pending_request);
|
|
|
|
switch (treatment) {
|
|
case REG_REQ_INTERSECT:
|
|
if (pending_request->initiator ==
|
|
NL80211_REGDOM_SET_BY_DRIVER) {
|
|
regd = reg_copy_regd(get_cfg80211_regdom());
|
|
if (IS_ERR(regd)) {
|
|
kfree(pending_request);
|
|
return PTR_ERR(regd);
|
|
}
|
|
rcu_assign_pointer(wiphy->regd, regd);
|
|
}
|
|
intersect = true;
|
|
break;
|
|
case REG_REQ_OK:
|
|
break;
|
|
default:
|
|
/*
|
|
* If the regulatory domain being requested by the
|
|
* driver has already been set just copy it to the
|
|
* wiphy
|
|
*/
|
|
if (treatment == REG_REQ_ALREADY_SET &&
|
|
pending_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) {
|
|
regd = reg_copy_regd(get_cfg80211_regdom());
|
|
if (IS_ERR(regd)) {
|
|
kfree(pending_request);
|
|
return REG_REQ_IGNORE;
|
|
}
|
|
treatment = REG_REQ_ALREADY_SET;
|
|
rcu_assign_pointer(wiphy->regd, regd);
|
|
goto new_request;
|
|
}
|
|
kfree(pending_request);
|
|
return treatment;
|
|
}
|
|
|
|
new_request:
|
|
lr = get_last_request();
|
|
if (lr != &core_request_world && lr)
|
|
kfree_rcu(lr, rcu_head);
|
|
|
|
pending_request->intersect = intersect;
|
|
pending_request->processed = false;
|
|
rcu_assign_pointer(last_request, pending_request);
|
|
lr = pending_request;
|
|
|
|
pending_request = NULL;
|
|
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_USER) {
|
|
user_alpha2[0] = lr->alpha2[0];
|
|
user_alpha2[1] = lr->alpha2[1];
|
|
}
|
|
|
|
/* When r == REG_REQ_INTERSECT we do need to call CRDA */
|
|
if (treatment != REG_REQ_OK && treatment != REG_REQ_INTERSECT) {
|
|
/*
|
|
* Since CRDA will not be called in this case as we already
|
|
* have applied the requested regulatory domain before we just
|
|
* inform userspace we have processed the request
|
|
*/
|
|
if (treatment == REG_REQ_ALREADY_SET) {
|
|
nl80211_send_reg_change_event(lr);
|
|
reg_set_request_processed();
|
|
}
|
|
return treatment;
|
|
}
|
|
|
|
if (call_crda(lr->alpha2))
|
|
return REG_REQ_IGNORE;
|
|
return REG_REQ_OK;
|
|
}
|
|
|
|
/* This processes *all* regulatory hints */
|
|
static void reg_process_hint(struct regulatory_request *reg_request,
|
|
enum nl80211_reg_initiator reg_initiator)
|
|
{
|
|
struct wiphy *wiphy = NULL;
|
|
|
|
if (WARN_ON(!reg_request->alpha2))
|
|
return;
|
|
|
|
if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
|
|
wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
|
|
|
|
if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && !wiphy) {
|
|
kfree(reg_request);
|
|
return;
|
|
}
|
|
|
|
switch (__regulatory_hint(wiphy, reg_request)) {
|
|
case REG_REQ_ALREADY_SET:
|
|
/* This is required so that the orig_* parameters are saved */
|
|
if (wiphy && wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
|
|
wiphy_update_regulatory(wiphy, reg_initiator);
|
|
break;
|
|
default:
|
|
if (reg_initiator == NL80211_REGDOM_SET_BY_USER)
|
|
schedule_delayed_work(®_timeout,
|
|
msecs_to_jiffies(3142));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
|
|
* Regulatory hints come on a first come first serve basis and we
|
|
* must process each one atomically.
|
|
*/
|
|
static void reg_process_pending_hints(void)
|
|
{
|
|
struct regulatory_request *reg_request, *lr;
|
|
|
|
mutex_lock(&cfg80211_mutex);
|
|
mutex_lock(®_mutex);
|
|
lr = get_last_request();
|
|
|
|
/* When last_request->processed becomes true this will be rescheduled */
|
|
if (lr && !lr->processed) {
|
|
REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n");
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(®_requests_lock);
|
|
|
|
if (list_empty(®_requests_list)) {
|
|
spin_unlock(®_requests_lock);
|
|
goto out;
|
|
}
|
|
|
|
reg_request = list_first_entry(®_requests_list,
|
|
struct regulatory_request,
|
|
list);
|
|
list_del_init(®_request->list);
|
|
|
|
spin_unlock(®_requests_lock);
|
|
|
|
reg_process_hint(reg_request, reg_request->initiator);
|
|
|
|
out:
|
|
mutex_unlock(®_mutex);
|
|
mutex_unlock(&cfg80211_mutex);
|
|
}
|
|
|
|
/* Processes beacon hints -- this has nothing to do with country IEs */
|
|
static void reg_process_pending_beacon_hints(void)
|
|
{
|
|
struct cfg80211_registered_device *rdev;
|
|
struct reg_beacon *pending_beacon, *tmp;
|
|
|
|
mutex_lock(&cfg80211_mutex);
|
|
mutex_lock(®_mutex);
|
|
|
|
/* This goes through the _pending_ beacon list */
|
|
spin_lock_bh(®_pending_beacons_lock);
|
|
|
|
list_for_each_entry_safe(pending_beacon, tmp,
|
|
®_pending_beacons, list) {
|
|
list_del_init(&pending_beacon->list);
|
|
|
|
/* Applies the beacon hint to current wiphys */
|
|
list_for_each_entry(rdev, &cfg80211_rdev_list, list)
|
|
wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
|
|
|
|
/* Remembers the beacon hint for new wiphys or reg changes */
|
|
list_add_tail(&pending_beacon->list, ®_beacon_list);
|
|
}
|
|
|
|
spin_unlock_bh(®_pending_beacons_lock);
|
|
mutex_unlock(®_mutex);
|
|
mutex_unlock(&cfg80211_mutex);
|
|
}
|
|
|
|
static void reg_todo(struct work_struct *work)
|
|
{
|
|
reg_process_pending_hints();
|
|
reg_process_pending_beacon_hints();
|
|
}
|
|
|
|
static void queue_regulatory_request(struct regulatory_request *request)
|
|
{
|
|
request->alpha2[0] = toupper(request->alpha2[0]);
|
|
request->alpha2[1] = toupper(request->alpha2[1]);
|
|
|
|
spin_lock(®_requests_lock);
|
|
list_add_tail(&request->list, ®_requests_list);
|
|
spin_unlock(®_requests_lock);
|
|
|
|
schedule_work(®_work);
|
|
}
|
|
|
|
/*
|
|
* Core regulatory hint -- happens during cfg80211_init()
|
|
* and when we restore regulatory settings.
|
|
*/
|
|
static int regulatory_hint_core(const char *alpha2)
|
|
{
|
|
struct regulatory_request *request;
|
|
|
|
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
|
|
if (!request)
|
|
return -ENOMEM;
|
|
|
|
request->alpha2[0] = alpha2[0];
|
|
request->alpha2[1] = alpha2[1];
|
|
request->initiator = NL80211_REGDOM_SET_BY_CORE;
|
|
|
|
queue_regulatory_request(request);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* User hints */
|
|
int regulatory_hint_user(const char *alpha2,
|
|
enum nl80211_user_reg_hint_type user_reg_hint_type)
|
|
{
|
|
struct regulatory_request *request;
|
|
|
|
if (WARN_ON(!alpha2))
|
|
return -EINVAL;
|
|
|
|
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
|
|
if (!request)
|
|
return -ENOMEM;
|
|
|
|
request->wiphy_idx = WIPHY_IDX_INVALID;
|
|
request->alpha2[0] = alpha2[0];
|
|
request->alpha2[1] = alpha2[1];
|
|
request->initiator = NL80211_REGDOM_SET_BY_USER;
|
|
request->user_reg_hint_type = user_reg_hint_type;
|
|
|
|
queue_regulatory_request(request);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Driver hints */
|
|
int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
|
|
{
|
|
struct regulatory_request *request;
|
|
|
|
if (WARN_ON(!alpha2 || !wiphy))
|
|
return -EINVAL;
|
|
|
|
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
|
|
if (!request)
|
|
return -ENOMEM;
|
|
|
|
request->wiphy_idx = get_wiphy_idx(wiphy);
|
|
|
|
request->alpha2[0] = alpha2[0];
|
|
request->alpha2[1] = alpha2[1];
|
|
request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
|
|
|
|
queue_regulatory_request(request);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(regulatory_hint);
|
|
|
|
/*
|
|
* We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
|
|
* therefore cannot iterate over the rdev list here.
|
|
*/
|
|
void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band,
|
|
const u8 *country_ie, u8 country_ie_len)
|
|
{
|
|
char alpha2[2];
|
|
enum environment_cap env = ENVIRON_ANY;
|
|
struct regulatory_request *request, *lr;
|
|
|
|
mutex_lock(®_mutex);
|
|
lr = get_last_request();
|
|
|
|
if (unlikely(!lr))
|
|
goto out;
|
|
|
|
/* IE len must be evenly divisible by 2 */
|
|
if (country_ie_len & 0x01)
|
|
goto out;
|
|
|
|
if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
|
|
goto out;
|
|
|
|
alpha2[0] = country_ie[0];
|
|
alpha2[1] = country_ie[1];
|
|
|
|
if (country_ie[2] == 'I')
|
|
env = ENVIRON_INDOOR;
|
|
else if (country_ie[2] == 'O')
|
|
env = ENVIRON_OUTDOOR;
|
|
|
|
/*
|
|
* We will run this only upon a successful connection on cfg80211.
|
|
* We leave conflict resolution to the workqueue, where can hold
|
|
* cfg80211_mutex.
|
|
*/
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
|
|
lr->wiphy_idx != WIPHY_IDX_INVALID)
|
|
goto out;
|
|
|
|
request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
|
|
if (!request)
|
|
goto out;
|
|
|
|
request->wiphy_idx = get_wiphy_idx(wiphy);
|
|
request->alpha2[0] = alpha2[0];
|
|
request->alpha2[1] = alpha2[1];
|
|
request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
|
|
request->country_ie_env = env;
|
|
|
|
queue_regulatory_request(request);
|
|
out:
|
|
mutex_unlock(®_mutex);
|
|
}
|
|
|
|
static void restore_alpha2(char *alpha2, bool reset_user)
|
|
{
|
|
/* indicates there is no alpha2 to consider for restoration */
|
|
alpha2[0] = '9';
|
|
alpha2[1] = '7';
|
|
|
|
/* The user setting has precedence over the module parameter */
|
|
if (is_user_regdom_saved()) {
|
|
/* Unless we're asked to ignore it and reset it */
|
|
if (reset_user) {
|
|
REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
|
|
user_alpha2[0] = '9';
|
|
user_alpha2[1] = '7';
|
|
|
|
/*
|
|
* If we're ignoring user settings, we still need to
|
|
* check the module parameter to ensure we put things
|
|
* back as they were for a full restore.
|
|
*/
|
|
if (!is_world_regdom(ieee80211_regdom)) {
|
|
REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
|
|
ieee80211_regdom[0], ieee80211_regdom[1]);
|
|
alpha2[0] = ieee80211_regdom[0];
|
|
alpha2[1] = ieee80211_regdom[1];
|
|
}
|
|
} else {
|
|
REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
|
|
user_alpha2[0], user_alpha2[1]);
|
|
alpha2[0] = user_alpha2[0];
|
|
alpha2[1] = user_alpha2[1];
|
|
}
|
|
} else if (!is_world_regdom(ieee80211_regdom)) {
|
|
REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
|
|
ieee80211_regdom[0], ieee80211_regdom[1]);
|
|
alpha2[0] = ieee80211_regdom[0];
|
|
alpha2[1] = ieee80211_regdom[1];
|
|
} else
|
|
REG_DBG_PRINT("Restoring regulatory settings\n");
|
|
}
|
|
|
|
static void restore_custom_reg_settings(struct wiphy *wiphy)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
enum ieee80211_band band;
|
|
struct ieee80211_channel *chan;
|
|
int i;
|
|
|
|
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
|
|
sband = wiphy->bands[band];
|
|
if (!sband)
|
|
continue;
|
|
for (i = 0; i < sband->n_channels; i++) {
|
|
chan = &sband->channels[i];
|
|
chan->flags = chan->orig_flags;
|
|
chan->max_antenna_gain = chan->orig_mag;
|
|
chan->max_power = chan->orig_mpwr;
|
|
chan->beacon_found = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restoring regulatory settings involves ingoring any
|
|
* possibly stale country IE information and user regulatory
|
|
* settings if so desired, this includes any beacon hints
|
|
* learned as we could have traveled outside to another country
|
|
* after disconnection. To restore regulatory settings we do
|
|
* exactly what we did at bootup:
|
|
*
|
|
* - send a core regulatory hint
|
|
* - send a user regulatory hint if applicable
|
|
*
|
|
* Device drivers that send a regulatory hint for a specific country
|
|
* keep their own regulatory domain on wiphy->regd so that does does
|
|
* not need to be remembered.
|
|
*/
|
|
static void restore_regulatory_settings(bool reset_user)
|
|
{
|
|
char alpha2[2];
|
|
char world_alpha2[2];
|
|
struct reg_beacon *reg_beacon, *btmp;
|
|
struct regulatory_request *reg_request, *tmp;
|
|
LIST_HEAD(tmp_reg_req_list);
|
|
struct cfg80211_registered_device *rdev;
|
|
|
|
mutex_lock(&cfg80211_mutex);
|
|
mutex_lock(®_mutex);
|
|
|
|
reset_regdomains(true, &world_regdom);
|
|
restore_alpha2(alpha2, reset_user);
|
|
|
|
/*
|
|
* If there's any pending requests we simply
|
|
* stash them to a temporary pending queue and
|
|
* add then after we've restored regulatory
|
|
* settings.
|
|
*/
|
|
spin_lock(®_requests_lock);
|
|
list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
|
|
if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER)
|
|
continue;
|
|
list_move_tail(®_request->list, &tmp_reg_req_list);
|
|
}
|
|
spin_unlock(®_requests_lock);
|
|
|
|
/* Clear beacon hints */
|
|
spin_lock_bh(®_pending_beacons_lock);
|
|
list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
|
|
list_del(®_beacon->list);
|
|
kfree(reg_beacon);
|
|
}
|
|
spin_unlock_bh(®_pending_beacons_lock);
|
|
|
|
list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
|
|
list_del(®_beacon->list);
|
|
kfree(reg_beacon);
|
|
}
|
|
|
|
/* First restore to the basic regulatory settings */
|
|
world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
|
|
world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
|
|
|
|
list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
|
|
if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
|
|
restore_custom_reg_settings(&rdev->wiphy);
|
|
}
|
|
|
|
regulatory_hint_core(world_alpha2);
|
|
|
|
/*
|
|
* This restores the ieee80211_regdom module parameter
|
|
* preference or the last user requested regulatory
|
|
* settings, user regulatory settings takes precedence.
|
|
*/
|
|
if (is_an_alpha2(alpha2))
|
|
regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER);
|
|
|
|
spin_lock(®_requests_lock);
|
|
list_splice_tail_init(&tmp_reg_req_list, ®_requests_list);
|
|
spin_unlock(®_requests_lock);
|
|
|
|
mutex_unlock(®_mutex);
|
|
mutex_unlock(&cfg80211_mutex);
|
|
|
|
REG_DBG_PRINT("Kicking the queue\n");
|
|
|
|
schedule_work(®_work);
|
|
}
|
|
|
|
void regulatory_hint_disconnect(void)
|
|
{
|
|
REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
|
|
restore_regulatory_settings(false);
|
|
}
|
|
|
|
static bool freq_is_chan_12_13_14(u16 freq)
|
|
{
|
|
if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
|
|
freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
|
|
freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
|
|
{
|
|
struct reg_beacon *pending_beacon;
|
|
|
|
list_for_each_entry(pending_beacon, ®_pending_beacons, list)
|
|
if (beacon_chan->center_freq ==
|
|
pending_beacon->chan.center_freq)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
int regulatory_hint_found_beacon(struct wiphy *wiphy,
|
|
struct ieee80211_channel *beacon_chan,
|
|
gfp_t gfp)
|
|
{
|
|
struct reg_beacon *reg_beacon;
|
|
bool processing;
|
|
|
|
if (beacon_chan->beacon_found ||
|
|
beacon_chan->flags & IEEE80211_CHAN_RADAR ||
|
|
(beacon_chan->band == IEEE80211_BAND_2GHZ &&
|
|
!freq_is_chan_12_13_14(beacon_chan->center_freq)))
|
|
return 0;
|
|
|
|
spin_lock_bh(®_pending_beacons_lock);
|
|
processing = pending_reg_beacon(beacon_chan);
|
|
spin_unlock_bh(®_pending_beacons_lock);
|
|
|
|
if (processing)
|
|
return 0;
|
|
|
|
reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
|
|
if (!reg_beacon)
|
|
return -ENOMEM;
|
|
|
|
REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
|
|
beacon_chan->center_freq,
|
|
ieee80211_frequency_to_channel(beacon_chan->center_freq),
|
|
wiphy_name(wiphy));
|
|
|
|
memcpy(®_beacon->chan, beacon_chan,
|
|
sizeof(struct ieee80211_channel));
|
|
|
|
/*
|
|
* Since we can be called from BH or and non-BH context
|
|
* we must use spin_lock_bh()
|
|
*/
|
|
spin_lock_bh(®_pending_beacons_lock);
|
|
list_add_tail(®_beacon->list, ®_pending_beacons);
|
|
spin_unlock_bh(®_pending_beacons_lock);
|
|
|
|
schedule_work(®_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void print_rd_rules(const struct ieee80211_regdomain *rd)
|
|
{
|
|
unsigned int i;
|
|
const struct ieee80211_reg_rule *reg_rule = NULL;
|
|
const struct ieee80211_freq_range *freq_range = NULL;
|
|
const struct ieee80211_power_rule *power_rule = NULL;
|
|
|
|
pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
|
|
|
|
for (i = 0; i < rd->n_reg_rules; i++) {
|
|
reg_rule = &rd->reg_rules[i];
|
|
freq_range = ®_rule->freq_range;
|
|
power_rule = ®_rule->power_rule;
|
|
|
|
/*
|
|
* There may not be documentation for max antenna gain
|
|
* in certain regions
|
|
*/
|
|
if (power_rule->max_antenna_gain)
|
|
pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
|
|
freq_range->start_freq_khz,
|
|
freq_range->end_freq_khz,
|
|
freq_range->max_bandwidth_khz,
|
|
power_rule->max_antenna_gain,
|
|
power_rule->max_eirp);
|
|
else
|
|
pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
|
|
freq_range->start_freq_khz,
|
|
freq_range->end_freq_khz,
|
|
freq_range->max_bandwidth_khz,
|
|
power_rule->max_eirp);
|
|
}
|
|
}
|
|
|
|
bool reg_supported_dfs_region(u8 dfs_region)
|
|
{
|
|
switch (dfs_region) {
|
|
case NL80211_DFS_UNSET:
|
|
case NL80211_DFS_FCC:
|
|
case NL80211_DFS_ETSI:
|
|
case NL80211_DFS_JP:
|
|
return true;
|
|
default:
|
|
REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
|
|
dfs_region);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static void print_dfs_region(u8 dfs_region)
|
|
{
|
|
if (!dfs_region)
|
|
return;
|
|
|
|
switch (dfs_region) {
|
|
case NL80211_DFS_FCC:
|
|
pr_info(" DFS Master region FCC");
|
|
break;
|
|
case NL80211_DFS_ETSI:
|
|
pr_info(" DFS Master region ETSI");
|
|
break;
|
|
case NL80211_DFS_JP:
|
|
pr_info(" DFS Master region JP");
|
|
break;
|
|
default:
|
|
pr_info(" DFS Master region Unknown");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void print_regdomain(const struct ieee80211_regdomain *rd)
|
|
{
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
if (is_intersected_alpha2(rd->alpha2)) {
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
|
|
struct cfg80211_registered_device *rdev;
|
|
rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
|
|
if (rdev) {
|
|
pr_info("Current regulatory domain updated by AP to: %c%c\n",
|
|
rdev->country_ie_alpha2[0],
|
|
rdev->country_ie_alpha2[1]);
|
|
} else
|
|
pr_info("Current regulatory domain intersected:\n");
|
|
} else
|
|
pr_info("Current regulatory domain intersected:\n");
|
|
} else if (is_world_regdom(rd->alpha2)) {
|
|
pr_info("World regulatory domain updated:\n");
|
|
} else {
|
|
if (is_unknown_alpha2(rd->alpha2))
|
|
pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
|
|
else {
|
|
if (reg_request_cell_base(lr))
|
|
pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
|
|
rd->alpha2[0], rd->alpha2[1]);
|
|
else
|
|
pr_info("Regulatory domain changed to country: %c%c\n",
|
|
rd->alpha2[0], rd->alpha2[1]);
|
|
}
|
|
}
|
|
|
|
print_dfs_region(rd->dfs_region);
|
|
print_rd_rules(rd);
|
|
}
|
|
|
|
static void print_regdomain_info(const struct ieee80211_regdomain *rd)
|
|
{
|
|
pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
|
|
print_rd_rules(rd);
|
|
}
|
|
|
|
/* Takes ownership of rd only if it doesn't fail */
|
|
static int __set_regdom(const struct ieee80211_regdomain *rd)
|
|
{
|
|
const struct ieee80211_regdomain *regd;
|
|
const struct ieee80211_regdomain *intersected_rd = NULL;
|
|
struct wiphy *request_wiphy;
|
|
struct regulatory_request *lr = get_last_request();
|
|
|
|
/* Some basic sanity checks first */
|
|
|
|
if (!reg_is_valid_request(rd->alpha2))
|
|
return -EINVAL;
|
|
|
|
if (is_world_regdom(rd->alpha2)) {
|
|
update_world_regdomain(rd);
|
|
return 0;
|
|
}
|
|
|
|
if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
|
|
!is_unknown_alpha2(rd->alpha2))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Lets only bother proceeding on the same alpha2 if the current
|
|
* rd is non static (it means CRDA was present and was used last)
|
|
* and the pending request came in from a country IE
|
|
*/
|
|
if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
|
|
/*
|
|
* If someone else asked us to change the rd lets only bother
|
|
* checking if the alpha2 changes if CRDA was already called
|
|
*/
|
|
if (!regdom_changes(rd->alpha2))
|
|
return -EALREADY;
|
|
}
|
|
|
|
/*
|
|
* Now lets set the regulatory domain, update all driver channels
|
|
* and finally inform them of what we have done, in case they want
|
|
* to review or adjust their own settings based on their own
|
|
* internal EEPROM data
|
|
*/
|
|
|
|
if (!is_valid_rd(rd)) {
|
|
pr_err("Invalid regulatory domain detected:\n");
|
|
print_regdomain_info(rd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
|
|
if (!request_wiphy &&
|
|
(lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
|
|
lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
|
|
schedule_delayed_work(®_timeout, 0);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!lr->intersect) {
|
|
if (lr->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
|
|
reset_regdomains(false, rd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For a driver hint, lets copy the regulatory domain the
|
|
* driver wanted to the wiphy to deal with conflicts
|
|
*/
|
|
|
|
/*
|
|
* Userspace could have sent two replies with only
|
|
* one kernel request.
|
|
*/
|
|
if (request_wiphy->regd)
|
|
return -EALREADY;
|
|
|
|
regd = reg_copy_regd(rd);
|
|
if (IS_ERR(regd))
|
|
return PTR_ERR(regd);
|
|
|
|
rcu_assign_pointer(request_wiphy->regd, regd);
|
|
reset_regdomains(false, rd);
|
|
return 0;
|
|
}
|
|
|
|
/* Intersection requires a bit more work */
|
|
|
|
if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
|
|
intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
|
|
if (!intersected_rd)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* We can trash what CRDA provided now.
|
|
* However if a driver requested this specific regulatory
|
|
* domain we keep it for its private use
|
|
*/
|
|
if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER) {
|
|
const struct ieee80211_regdomain *tmp;
|
|
|
|
tmp = get_wiphy_regdom(request_wiphy);
|
|
rcu_assign_pointer(request_wiphy->regd, rd);
|
|
rcu_free_regdom(tmp);
|
|
} else {
|
|
kfree(rd);
|
|
}
|
|
|
|
rd = NULL;
|
|
|
|
reset_regdomains(false, intersected_rd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Use this call to set the current regulatory domain. Conflicts with
|
|
* multiple drivers can be ironed out later. Caller must've already
|
|
* kmalloc'd the rd structure.
|
|
*/
|
|
int set_regdom(const struct ieee80211_regdomain *rd)
|
|
{
|
|
struct regulatory_request *lr;
|
|
int r;
|
|
|
|
mutex_lock(®_mutex);
|
|
lr = get_last_request();
|
|
|
|
/* Note that this doesn't update the wiphys, this is done below */
|
|
r = __set_regdom(rd);
|
|
if (r) {
|
|
if (r == -EALREADY)
|
|
reg_set_request_processed();
|
|
|
|
kfree(rd);
|
|
goto out;
|
|
}
|
|
|
|
/* This would make this whole thing pointless */
|
|
if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom())) {
|
|
r = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* update all wiphys now with the new established regulatory domain */
|
|
update_all_wiphy_regulatory(lr->initiator);
|
|
|
|
print_regdomain(get_cfg80211_regdom());
|
|
|
|
nl80211_send_reg_change_event(lr);
|
|
|
|
reg_set_request_processed();
|
|
|
|
out:
|
|
mutex_unlock(®_mutex);
|
|
|
|
return r;
|
|
}
|
|
|
|
int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct regulatory_request *lr;
|
|
u8 alpha2[2];
|
|
bool add = false;
|
|
|
|
rcu_read_lock();
|
|
lr = get_last_request();
|
|
if (lr && !lr->processed) {
|
|
memcpy(alpha2, lr->alpha2, 2);
|
|
add = true;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (add)
|
|
return add_uevent_var(env, "COUNTRY=%c%c",
|
|
alpha2[0], alpha2[1]);
|
|
return 0;
|
|
}
|
|
|
|
void wiphy_regulatory_register(struct wiphy *wiphy)
|
|
{
|
|
mutex_lock(®_mutex);
|
|
|
|
if (!reg_dev_ignore_cell_hint(wiphy))
|
|
reg_num_devs_support_basehint++;
|
|
|
|
wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
|
|
|
|
mutex_unlock(®_mutex);
|
|
}
|
|
|
|
/* Caller must hold cfg80211_mutex */
|
|
void wiphy_regulatory_deregister(struct wiphy *wiphy)
|
|
{
|
|
struct wiphy *request_wiphy = NULL;
|
|
struct regulatory_request *lr;
|
|
|
|
mutex_lock(®_mutex);
|
|
lr = get_last_request();
|
|
|
|
if (!reg_dev_ignore_cell_hint(wiphy))
|
|
reg_num_devs_support_basehint--;
|
|
|
|
rcu_free_regdom(get_wiphy_regdom(wiphy));
|
|
rcu_assign_pointer(wiphy->regd, NULL);
|
|
|
|
if (lr)
|
|
request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
|
|
|
|
if (!request_wiphy || request_wiphy != wiphy)
|
|
goto out;
|
|
|
|
lr->wiphy_idx = WIPHY_IDX_INVALID;
|
|
lr->country_ie_env = ENVIRON_ANY;
|
|
out:
|
|
mutex_unlock(®_mutex);
|
|
}
|
|
|
|
static void reg_timeout_work(struct work_struct *work)
|
|
{
|
|
REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
|
|
restore_regulatory_settings(true);
|
|
}
|
|
|
|
int __init regulatory_init(void)
|
|
{
|
|
int err = 0;
|
|
|
|
reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
|
|
if (IS_ERR(reg_pdev))
|
|
return PTR_ERR(reg_pdev);
|
|
|
|
reg_pdev->dev.type = ®_device_type;
|
|
|
|
spin_lock_init(®_requests_lock);
|
|
spin_lock_init(®_pending_beacons_lock);
|
|
|
|
reg_regdb_size_check();
|
|
|
|
rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
|
|
|
|
user_alpha2[0] = '9';
|
|
user_alpha2[1] = '7';
|
|
|
|
/* We always try to get an update for the static regdomain */
|
|
err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
|
|
if (err) {
|
|
if (err == -ENOMEM)
|
|
return err;
|
|
/*
|
|
* N.B. kobject_uevent_env() can fail mainly for when we're out
|
|
* memory which is handled and propagated appropriately above
|
|
* but it can also fail during a netlink_broadcast() or during
|
|
* early boot for call_usermodehelper(). For now treat these
|
|
* errors as non-fatal.
|
|
*/
|
|
pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
|
|
}
|
|
|
|
/*
|
|
* Finally, if the user set the module parameter treat it
|
|
* as a user hint.
|
|
*/
|
|
if (!is_world_regdom(ieee80211_regdom))
|
|
regulatory_hint_user(ieee80211_regdom,
|
|
NL80211_USER_REG_HINT_USER);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void regulatory_exit(void)
|
|
{
|
|
struct regulatory_request *reg_request, *tmp;
|
|
struct reg_beacon *reg_beacon, *btmp;
|
|
|
|
cancel_work_sync(®_work);
|
|
cancel_delayed_work_sync(®_timeout);
|
|
|
|
/* Lock to suppress warnings */
|
|
mutex_lock(®_mutex);
|
|
reset_regdomains(true, NULL);
|
|
mutex_unlock(®_mutex);
|
|
|
|
dev_set_uevent_suppress(®_pdev->dev, true);
|
|
|
|
platform_device_unregister(reg_pdev);
|
|
|
|
list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) {
|
|
list_del(®_beacon->list);
|
|
kfree(reg_beacon);
|
|
}
|
|
|
|
list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) {
|
|
list_del(®_beacon->list);
|
|
kfree(reg_beacon);
|
|
}
|
|
|
|
list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) {
|
|
list_del(®_request->list);
|
|
kfree(reg_request);
|
|
}
|
|
}
|