Release 4.11 net/wireless/reg.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2008-2011  Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */


/**
 * DOC: Wireless regulatory infrastructure
 *
 * The usual implementation is for a driver to read a device EEPROM to
 * determine which regulatory domain it should be operating under, then
 * looking up the allowable channels in a driver-local table and finally
 * registering those channels in the wiphy structure.
 *
 * Another set of compliance enforcement is for drivers to use their
 * own compliance limits which can be stored on the EEPROM. The host
 * driver or firmware may ensure these are used.
 *
 * In addition to all this we provide an extra layer of regulatory
 * conformance. For drivers which do not have any regulatory
 * information CRDA provides the complete regulatory solution.
 * For others it provides a community effort on further restrictions
 * to enhance compliance.
 *
 * Note: When number of rules --> infinity we will not be able to
 * index on alpha2 any more, instead we'll probably have to
 * rely on some SHA1 checksum of the regdomain for example.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/nl80211.h>
#include <linux/platform_device.h>
#include <linux/moduleparam.h>
#include <net/cfg80211.h>
#include "core.h"
#include "reg.h"
#include "rdev-ops.h"
#include "regdb.h"
#include "nl80211.h"

/*
 * Grace period we give before making sure all current interfaces reside on
 * channels allowed by the current regulatory domain.
 */

#define REG_ENFORCE_GRACE_MS 60000

/**
 * enum reg_request_treatment - regulatory request treatment
 *
 * @REG_REQ_OK: continue processing the regulatory request
 * @REG_REQ_IGNORE: ignore the regulatory request
 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
 *      be intersected with the current one.
 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
 *      regulatory settings, and no further processing is required.
 */

enum reg_request_treatment {
	
REG_REQ_OK,
	
REG_REQ_IGNORE,
	
REG_REQ_INTERSECT,
	
REG_REQ_ALREADY_SET,
};


static struct regulatory_request core_request_world = {
	.initiator = NL80211_REGDOM_SET_BY_CORE,
	.alpha2[0] = '0',
	.alpha2[1] = '0',
	.intersect = false,
	.processed = true,
	.country_ie_env = ENVIRON_ANY,
};

/*
 * Receipt of information from last regulatory request,
 * protected by RTNL (and can be accessed with RCU protection)
 */

static struct regulatory_request __rcu *last_request =
	(void __force __rcu *)&core_request_world;

/* To trigger userspace events */

static struct platform_device *reg_pdev;

/*
 * Central wireless core regulatory domains, we only need two,
 * the current one and a world regulatory domain in case we have no
 * information to give us an alpha2.
 * (protected by RTNL, can be read under RCU)
 */

const struct ieee80211_regdomain __rcu *cfg80211_regdomain;

/*
 * Number of devices that registered to the core
 * that support cellular base station regulatory hints
 * (protected by RTNL)
 */

static int reg_num_devs_support_basehint;

/*
 * State variable indicating if the platform on which the devices
 * are attached is operating in an indoor environment. The state variable
 * is relevant for all registered devices.
 */

static bool reg_is_indoor;

static spinlock_t reg_indoor_lock;

/* Used to track the userspace process controlling the indoor setting */

static u32 reg_is_indoor_portid;

static void restore_regulatory_settings(bool reset_user);



static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
{
	return rtnl_dereference(cfg80211_regdomain);
}

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const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
{
	return rtnl_dereference(wiphy->regd);
}

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static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
{
	switch (dfs_region) {
	case NL80211_DFS_UNSET:
		return "unset";
	case NL80211_DFS_FCC:
		return "FCC";
	case NL80211_DFS_ETSI:
		return "ETSI";
	case NL80211_DFS_JP:
		return "JP";
	}
	return "Unknown";
}

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enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
{
	const struct ieee80211_regdomain *regd = NULL;
	const struct ieee80211_regdomain *wiphy_regd = NULL;

	regd = get_cfg80211_regdom();
	if (!wiphy)
		goto out;

	wiphy_regd = get_wiphy_regdom(wiphy);
	if (!wiphy_regd)
		goto out;

	if (wiphy_regd->dfs_region == regd->dfs_region)
		goto out;

	pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
		 dev_name(&wiphy->dev),
		 reg_dfs_region_str(wiphy_regd->dfs_region),
		 reg_dfs_region_str(regd->dfs_region));

out:
	return regd->dfs_region;
}

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static void rcu_free_regdom(const struct ieee80211_regdomain *r)
{
	if (!r)
		return;
	kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
}

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static struct regulatory_request *get_last_request(void)
{
	return rcu_dereference_rtnl(last_request);
}

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/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);

static spinlock_t reg_requests_lock;

/* Used to queue up beacon hints for review */
static LIST_HEAD(reg_pending_beacons);

static spinlock_t reg_pending_beacons_lock;

/* Used to keep track of processed beacon hints */
static LIST_HEAD(reg_beacon_list);


struct reg_beacon {
	
struct list_head list;
	
struct ieee80211_channel chan;
};

static void reg_check_chans_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);

static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);

/* We keep a static world regulatory domain in case of the absence of CRDA */

static const struct ieee80211_regdomain world_regdom = {
	.n_reg_rules = 8,
	.alpha2 =  "00",
	.reg_rules = {
		/* IEEE 802.11b/g, channels 1..11 */
		REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
		/* IEEE 802.11b/g, channels 12..13. */
		REG_RULE(2467-10, 2472+10, 20, 6, 20,
			NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
		/* IEEE 802.11 channel 14 - Only JP enables
                 * this and for 802.11b only */
		REG_RULE(2484-10, 2484+10, 20, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_NO_OFDM),
		/* IEEE 802.11a, channel 36..48 */
		REG_RULE(5180-10, 5240+10, 80, 6, 20,
                        NL80211_RRF_NO_IR |
                        NL80211_RRF_AUTO_BW),

		/* IEEE 802.11a, channel 52..64 - DFS required */
		REG_RULE(5260-10, 5320+10, 80, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_AUTO_BW |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 100..144 - DFS required */
		REG_RULE(5500-10, 5720+10, 160, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 149..165 */
		REG_RULE(5745-10, 5825+10, 80, 6, 20,
			NL80211_RRF_NO_IR),

		/* IEEE 802.11ad (60GHz), channels 1..3 */
		REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
        }
};

/* protected by RTNL */

static const struct ieee80211_regdomain *cfg80211_world_regdom =
	&world_regdom;


static char *ieee80211_regdom = "00";

static char user_alpha2[2];

module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");



static void reg_free_request(struct regulatory_request *request)
{
	if (request == &core_request_world)
		return;

	if (request != get_last_request())
		kfree(request);
}

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static void reg_free_last_request(void)
{
	struct regulatory_request *lr = get_last_request();

	if (lr != &core_request_world && lr)
		kfree_rcu(lr, rcu_head);
}

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static void reg_update_last_request(struct regulatory_request *request)
{
	struct regulatory_request *lr;

	lr = get_last_request();
	if (lr == request)
		return;

	reg_free_last_request();
	rcu_assign_pointer(last_request, request);
}

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static void reset_regdomains(bool full_reset,
			     const struct ieee80211_regdomain *new_regdom)
{
	const struct ieee80211_regdomain *r;

	ASSERT_RTNL();

	r = get_cfg80211_regdom();

	/* avoid freeing static information or freeing something twice */
	if (r == cfg80211_world_regdom)
		r = NULL;
	if (cfg80211_world_regdom == &world_regdom)
		cfg80211_world_regdom = NULL;
	if (r == &world_regdom)
		r = NULL;

	rcu_free_regdom(r);
	rcu_free_regdom(cfg80211_world_regdom);

	cfg80211_world_regdom = &world_regdom;
	rcu_assign_pointer(cfg80211_regdomain, new_regdom);

	if (!full_reset)
		return;

	reg_update_last_request(&core_request_world);
}

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/*
 * Dynamic world regulatory domain requested by the wireless
 * core upon initialization
 */


static void update_world_regdomain(const struct ieee80211_regdomain *rd)
{
	struct regulatory_request *lr;

	lr = get_last_request();

	WARN_ON(!lr);

	reset_regdomains(false, rd);

	cfg80211_world_regdom = rd;
}

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bool is_world_regdom(const char *alpha2)
{
	if (!alpha2)
		return false;
	return alpha2[0] == '0' && alpha2[1] == '0';
}

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static bool is_alpha2_set(const char *alpha2)
{
	if (!alpha2)
		return false;
	return alpha2[0] && alpha2[1];
}

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static bool is_unknown_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	/*
         * Special case where regulatory domain was built by driver
         * but a specific alpha2 cannot be determined
         */
	return alpha2[0] == '9' && alpha2[1] == '9';
}

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static bool is_intersected_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	/*
         * Special case where regulatory domain is the
         * result of an intersection between two regulatory domain
         * structures
         */
	return alpha2[0] == '9' && alpha2[1] == '8';
}

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static bool is_an_alpha2(const char *alpha2)
{
	if (!alpha2)
		return false;
	return isalpha(alpha2[0]) && isalpha(alpha2[1]);
}

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static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
{
	if (!alpha2_x || !alpha2_y)
		return false;
	return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
}

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static bool regdom_changes(const char *alpha2)
{
	const struct ieee80211_regdomain *r = get_cfg80211_regdom();

	if (!r)
		return true;
	return !alpha2_equal(r->alpha2, alpha2);
}

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/*
 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
 * has ever been issued.
 */


static bool is_user_regdom_saved(void)
{
	if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
		return false;

	/* This would indicate a mistake on the design */
	if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
		 "Unexpected user alpha2: %c%c\n",
		 user_alpha2[0], user_alpha2[1]))
		return false;

	return true;
}

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static const struct ieee80211_regdomain *

reg_copy_regd(const struct ieee80211_regdomain *src_regd)
{
	struct ieee80211_regdomain *regd;
	int size_of_regd;
	unsigned int i;

	size_of_regd =
		sizeof(struct ieee80211_regdomain) +
		src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule);

	regd = kzalloc(size_of_regd, GFP_KERNEL);
	if (!regd)
		return ERR_PTR(-ENOMEM);

	memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));

	for (i = 0; i < src_regd->n_reg_rules; i++)
		memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
		       sizeof(struct ieee80211_reg_rule));

	return regd;
}

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#ifdef CONFIG_CFG80211_INTERNAL_REGDB

struct reg_regdb_apply_request {
	
struct list_head list;
	
const struct ieee80211_regdomain *regdom;
};

static LIST_HEAD(reg_regdb_apply_list);
static DEFINE_MUTEX(reg_regdb_apply_mutex);



static void reg_regdb_apply(struct work_struct *work)
{
	struct reg_regdb_apply_request *request;

	rtnl_lock();

	mutex_lock(&reg_regdb_apply_mutex);
	while (!list_empty(&reg_regdb_apply_list)) {
		request = list_first_entry(&reg_regdb_apply_list,
					   struct reg_regdb_apply_request,
					   list);
		list_del(&request->list);

		set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
		kfree(request);
	}
	mutex_unlock(&reg_regdb_apply_mutex);

	rtnl_unlock();
}

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static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);



static int reg_query_builtin(const char *alpha2)
{
	const struct ieee80211_regdomain *regdom = NULL;
	struct reg_regdb_apply_request *request;
	unsigned int i;

	for (i = 0; i < reg_regdb_size; i++) {
		if (alpha2_equal(alpha2, reg_regdb[i]->alpha2)) {
			regdom = reg_regdb[i];
			break;
		}
	}

	if (!regdom)
		return -ENODATA;

	request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
	if (!request)
		return -ENOMEM;

	request->regdom = reg_copy_regd(regdom);
	if (IS_ERR_OR_NULL(request->regdom)) {
		kfree(request);
		return -ENOMEM;
	}

	mutex_lock(&reg_regdb_apply_mutex);
	list_add_tail(&request->list, &reg_regdb_apply_list);
	mutex_unlock(&reg_regdb_apply_mutex);

	schedule_work(&reg_regdb_work);

	return 0;
}

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/* Feel free to add any other sanity checks here */


static void reg_regdb_size_check(void)
{
	/* We should ideally BUILD_BUG_ON() but then random builds would fail */
	WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it...");
}
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#else


static inline void reg_regdb_size_check(void) {}
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static inline int reg_query_builtin(const char *alpha2)
{
	return -ENODATA;
}
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#endif /* CONFIG_CFG80211_INTERNAL_REGDB */

#ifdef CONFIG_CFG80211_CRDA_SUPPORT
/* Max number of consecutive attempts to communicate with CRDA  */

#define REG_MAX_CRDA_TIMEOUTS 10


static u32 reg_crda_timeouts;

static void crda_timeout_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);



static void crda_timeout_work(struct work_struct *work)
{
	pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
	rtnl_lock();
	reg_crda_timeouts++;
	restore_regulatory_settings(true);
	rtnl_unlock();
}

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static void cancel_crda_timeout(void)
{
	cancel_delayed_work(&crda_timeout);
}

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static void cancel_crda_timeout_sync(void)
{
	cancel_delayed_work_sync(&crda_timeout);
}

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static void reset_crda_timeouts(void)
{
	reg_crda_timeouts = 0;
}

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/*
 * This lets us keep regulatory code which is updated on a regulatory
 * basis in userspace.
 */


static int call_crda(const char *alpha2)
{
	char country[12];
	char *env[] = { country, NULL };
	int ret;

	snprintf(country, sizeof(country), "COUNTRY=%c%c",
		 alpha2[0], alpha2[1]);

	if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
		pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
		return -EINVAL;
	}

	if (!is_world_regdom((char *) alpha2))
		pr_debug("Calling CRDA for country: %c%c\n",
			 alpha2[0], alpha2[1]);
	else
		pr_debug("Calling CRDA to update world regulatory domain\n");

	ret = kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, env);
	if (ret)
		return ret;

	queue_delayed_work(system_power_efficient_wq,
			   &crda_timeout, msecs_to_jiffies(3142));
	return 0;
}
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16
11.27%
1
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Thomas Petazzoni
3
2.11%
1
14.29%
Joe Perches
2
1.41%
1
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#else


static inline void cancel_crda_timeout(void) {}
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static inline void cancel_crda_timeout_sync(void) {}
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static inline void reset_crda_timeouts(void) {}
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static inline int call_crda(const char *alpha2)
{
	return -ENODATA;
}
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#endif /* CONFIG_CFG80211_CRDA_SUPPORT */



static bool reg_query_database(struct regulatory_request *request)
{
	/* query internal regulatory database (if it exists) */
	if (reg_query_builtin(request->alpha2) == 0)
		return true;

	if (call_crda(request->alpha2) == 0)
		return true;

	return false;
}

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bool reg_is_valid_request(const char *alpha2)
{
	struct regulatory_request *lr = get_last_request();

	if (!lr || lr->processed)
		return false;

	return alpha2_equal(lr->alpha2, alpha2);
}

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40
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6
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static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
{
	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)
		return get_wiphy_regdom(wiphy);

	return get_cfg80211_regdom();
}

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static unsigned int

reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
				 const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
	const struct ieee80211_freq_range *freq_range_tmp;
	const struct ieee80211_reg_rule *tmp;
	u32 start_freq, end_freq, idx, no;

	for (idx = 0; idx < rd->n_reg_rules; idx++)
		if (rule == &rd->reg_rules[idx])
			break;

	if (idx == rd->n_reg_rules)
		return 0;

	/* get start_freq */
	no = idx;

	while (no) {
		tmp = &rd->reg_rules[--no];
		freq_range_tmp = &tmp->freq_range;

		if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
			break;

		freq_range = freq_range_tmp;
	}

	start_freq = freq_range->start_freq_khz;

	/* get end_freq */
	freq_range = &rule->freq_range;
	no = idx;

	while (no < rd->n_reg_rules - 1) {
		tmp = &rd->reg_rules[++no];
		freq_range_tmp = &tmp->freq_range;

		if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
			break;

		freq_range = freq_range_tmp;
	}

	end_freq = freq_range->end_freq_khz;

	return end_freq - start_freq;
}

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unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
				   const struct ieee80211_reg_rule *rule)
{
	unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);

	if (rule->flags & NL80211_RRF_NO_160MHZ)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
	if (rule->flags & NL80211_RRF_NO_80MHZ)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));

	/*
         * HT40+/HT40- limits are handled per-channel. Only limit BW if both
         * are not allowed.
         */
	if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
	    rule->flags & NL80211_RRF_NO_HT40PLUS)
		bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));

	return bw;
}

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/* Sanity check on a regulatory rule */


static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
{
	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
	u32 freq_diff;

	if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
		return false;

	if (freq_range->start_freq_khz > freq_range->end_freq_khz)
		return false;

	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;

	if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
	    freq_range->max_bandwidth_khz > freq_diff)
		return false;

	return true;
}

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static bool is_valid_rd(const struct ieee80211_regdomain *rd)
{
	const struct ieee80211_reg_rule *reg_rule = NULL;
	unsigned int i;

	if (!rd->n_reg_rules)
		return false;

	if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
		return false;

	for (i = 0; i < rd->n_reg_rules; i++) {
		reg_rule = &rd->reg_rules[i];
		if (!is_valid_reg_rule(reg_rule))
			return false;
	}

	return true;
}

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/**
 * 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
}

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/*
 * Later on we can perhaps use the more restrictive DFS
 * region but we don't have information for that yet so
 * for now simply disallow conflicts.
 */

static enum nl80211_dfs_regions

reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
			 const enum nl80211_dfs_regions dfs_region2)
{
	if (dfs_region1 != dfs_region2)
		return NL80211_DFS_UNSET;
	return dfs_region1;
}

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/*
 * Helper for regdom_intersect(), this does the real
 * mathematical intersection fun
 */


static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
			       const struct ieee80211_regdomain *rd2,
			       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, max_bandwidth1, max_bandwidth2;

	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(