Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4285 insertions, 0 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
new file mode 100644
index 000000000..90297264d
--- /dev/null
+++ b/net/wireless/reg.c
@@ -0,0 +1,4285 @@
+/*
+ * 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
+ * Copyright      2017  Intel Deutschland GmbH
+ * Copyright (C) 2018 - 2019 Intel Corporation
+ *
+ * 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/verification.h>
+#include <linux/moduleparam.h>
+#include <linux/firmware.h>
+#include <net/cfg80211.h>
+#include "core.h"
+#include "reg.h"
+#include "rdev-ops.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 and load firmware */
+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, bool cached);
+static void print_regdomain(const struct ieee80211_regdomain *rd);
+
+static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
+{
+	return rcu_dereference_rtnl(cfg80211_regdomain);
+}
+
+const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
+{
+	return rcu_dereference_rtnl(wiphy->regd);
+}
+
+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";
+}
+
+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;
+}
+
+static void rcu_free_regdom(const struct ieee80211_regdomain *r)
+{
+	if (!r)
+		return;
+	kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
+}
+
+static struct regulatory_request *get_last_request(void)
+{
+	return rcu_dereference_rtnl(last_request);
+}
+
+/* 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];
+static const struct ieee80211_regdomain *cfg80211_user_regdom;
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+/*
+ * 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;
+}
+
+bool is_world_regdom(const char *alpha2)
+{
+	if (!alpha2)
+		return false;
+	return alpha2[0] == '0' && alpha2[1] == '0';
+}
+
+static bool is_alpha2_set(const char *alpha2)
+{
+	if (!alpha2)
+		return false;
+	return alpha2[0] && alpha2[1];
+}
+
+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';
+}
+
+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';
+}
+
+static bool is_an_alpha2(const char *alpha2)
+{
+	if (!alpha2)
+		return false;
+	return isalpha(alpha2[0]) && isalpha(alpha2[1]);
+}
+
+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];
+}
+
+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);
+}
+
+/*
+ * 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;
+}
+
+static const struct ieee80211_regdomain *
+reg_copy_regd(const struct ieee80211_regdomain *src_regd)
+{
+	struct ieee80211_regdomain *regd;
+	unsigned int i;
+
+	regd = kzalloc(struct_size(regd, reg_rules, src_regd->n_reg_rules),
+		       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;
+}
+
+static void cfg80211_save_user_regdom(const struct ieee80211_regdomain *rd)
+{
+	ASSERT_RTNL();
+
+	if (!IS_ERR(cfg80211_user_regdom))
+		kfree(cfg80211_user_regdom);
+	cfg80211_user_regdom = reg_copy_regd(rd);
+}
+
+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();
+}
+
+static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
+
+static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
+{
+	struct reg_regdb_apply_request *request;
+
+	request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
+	if (!request) {
+		kfree(regdom);
+		return -ENOMEM;
+	}
+
+	request->regdom = regdom;
+
+	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;
+}
+
+#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, false);
+	rtnl_unlock();
+}
+
+static void cancel_crda_timeout(void)
+{
+	cancel_delayed_work(&crda_timeout);
+}
+
+static void cancel_crda_timeout_sync(void)
+{
+	cancel_delayed_work_sync(&crda_timeout);
+}
+
+static void reset_crda_timeouts(void)
+{
+	reg_crda_timeouts = 0;
+}
+
+/*
+ * 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;
+}
+#else
+static inline void cancel_crda_timeout(void) {}
+static inline void cancel_crda_timeout_sync(void) {}
+static inline void reset_crda_timeouts(void) {}
+static inline int call_crda(const char *alpha2)
+{
+	return -ENODATA;
+}
+#endif /* CONFIG_CFG80211_CRDA_SUPPORT */
+
+/* code to directly load a firmware database through request_firmware */
+static const struct fwdb_header *regdb;
+
+struct fwdb_country {
+	u8 alpha2[2];
+	__be16 coll_ptr;
+	/* this struct cannot be extended */
+} __packed __aligned(4);
+
+struct fwdb_collection {
+	u8 len;
+	u8 n_rules;
+	u8 dfs_region;
+	/* no optional data yet */
+	/* aligned to 2, then followed by __be16 array of rule pointers */
+} __packed __aligned(4);
+
+enum fwdb_flags {
+	FWDB_FLAG_NO_OFDM	= BIT(0),
+	FWDB_FLAG_NO_OUTDOOR	= BIT(1),
+	FWDB_FLAG_DFS		= BIT(2),
+	FWDB_FLAG_NO_IR		= BIT(3),
+	FWDB_FLAG_AUTO_BW	= BIT(4),
+};
+
+struct fwdb_wmm_ac {
+	u8 ecw;
+	u8 aifsn;
+	__be16 cot;
+} __packed;
+
+struct fwdb_wmm_rule {
+	struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
+	struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
+} __packed;
+
+struct fwdb_rule {
+	u8 len;
+	u8 flags;
+	__be16 max_eirp;
+	__be32 start, end, max_bw;
+	/* start of optional data */
+	__be16 cac_timeout;
+	__be16 wmm_ptr;
+} __packed __aligned(4);
+
+#define FWDB_MAGIC 0x52474442
+#define FWDB_VERSION 20
+
+struct fwdb_header {
+	__be32 magic;
+	__be32 version;
+	struct fwdb_country country[];
+} __packed __aligned(4);
+
+static int ecw2cw(int ecw)
+{
+	return (1 << ecw) - 1;
+}
+
+static bool valid_wmm(struct fwdb_wmm_rule *rule)
+{
+	struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
+	int i;
+
+	for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
+		u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
+		u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
+		u8 aifsn = ac[i].aifsn;
+
+		if (cw_min >= cw_max)
+			return false;
+
+		if (aifsn < 1)
+			return false;
+	}
+
+	return true;
+}
+
+static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
+{
+	struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));
+
+	if ((u8 *)rule + sizeof(rule->len) > data + size)
+		return false;
+
+	/* mandatory fields */
+	if (rule->len < offsetofend(struct fwdb_rule, max_bw))
+		return false;
+	if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
+		u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
+		struct fwdb_wmm_rule *wmm;
+
+		if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
+			return false;
+
+		wmm = (void *)(data + wmm_ptr);
+
+		if (!valid_wmm(wmm))
+			return false;
+	}
+	return true;
+}
+
+static bool valid_country(const u8 *data, unsigned int size,
+			  const struct fwdb_country *country)
+{
+	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
+	struct fwdb_collection *coll = (void *)(data + ptr);
+	__be16 *rules_ptr;
+	unsigned int i;
+
+	/* make sure we can read len/n_rules */
+	if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
+		return false;
+
+	/* make sure base struct and all rules fit */
+	if ((u8 *)coll + ALIGN(coll->len, 2) +
+	    (coll->n_rules * 2) > data + size)
+		return false;
+
+	/* mandatory fields must exist */
+	if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
+		return false;
+
+	rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
+
+	for (i = 0; i < coll->n_rules; i++) {
+		u16 rule_ptr = be16_to_cpu(rules_ptr[i]);
+
+		if (!valid_rule(data, size, rule_ptr))
+			return false;
+	}
+
+	return true;
+}
+
+#ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
+static struct key *builtin_regdb_keys;
+
+static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
+{
+	const u8 *end = p + buflen;
+	size_t plen;
+	key_ref_t key;
+
+	while (p < end) {
+		/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
+		 * than 256 bytes in size.
+		 */
+		if (end - p < 4)
+			goto dodgy_cert;
+		if (p[0] != 0x30 &&
+		    p[1] != 0x82)
+			goto dodgy_cert;
+		plen = (p[2] << 8) | p[3];
+		plen += 4;
+		if (plen > end - p)
+			goto dodgy_cert;
+
+		key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
+					   "asymmetric", NULL, p, plen,
+					   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
+					    KEY_USR_VIEW | KEY_USR_READ),
+					   KEY_ALLOC_NOT_IN_QUOTA |
+					   KEY_ALLOC_BUILT_IN |
+					   KEY_ALLOC_BYPASS_RESTRICTION);
+		if (IS_ERR(key)) {
+			pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
+			       PTR_ERR(key));
+		} else {
+			pr_notice("Loaded X.509 cert '%s'\n",
+				  key_ref_to_ptr(key)->description);
+			key_ref_put(key);
+		}
+		p += plen;
+	}
+
+	return;
+
+dodgy_cert:
+	pr_err("Problem parsing in-kernel X.509 certificate list\n");
+}
+
+static int __init load_builtin_regdb_keys(void)
+{
+	builtin_regdb_keys =
+		keyring_alloc(".builtin_regdb_keys",
+			      KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
+			      ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
+			      KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
+			      KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
+	if (IS_ERR(builtin_regdb_keys))
+		return PTR_ERR(builtin_regdb_keys);
+
+	pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");
+
+#ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
+	load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
+#endif
+#ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
+	if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
+		load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
+#endif
+
+	return 0;
+}
+
+MODULE_FIRMWARE("regulatory.db.p7s");
+
+static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
+{
+	const struct firmware *sig;
+	bool result;
+
+	if (request_firmware(&sig, "regulatory.db.p7s", &reg_pdev->dev))
+		return false;
+
+	result = verify_pkcs7_signature(data, size, sig->data, sig->size,
+					builtin_regdb_keys,
+					VERIFYING_UNSPECIFIED_SIGNATURE,
+					NULL, NULL) == 0;
+
+	release_firmware(sig);
+
+	return result;
+}
+
+static void free_regdb_keyring(void)
+{
+	key_put(builtin_regdb_keys);
+}
+#else
+static int load_builtin_regdb_keys(void)
+{
+	return 0;
+}
+
+static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
+{
+	return true;
+}
+
+static void free_regdb_keyring(void)
+{
+}
+#endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */
+
+static bool valid_regdb(const u8 *data, unsigned int size)
+{
+	const struct fwdb_header *hdr = (void *)data;
+	const struct fwdb_country *country;
+
+	if (size < sizeof(*hdr))
+		return false;
+
+	if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
+		return false;
+
+	if (hdr->version != cpu_to_be32(FWDB_VERSION))
+		return false;
+
+	if (!regdb_has_valid_signature(data, size))
+		return false;
+
+	country = &hdr->country[0];
+	while ((u8 *)(country + 1) <= data + size) {
+		if (!country->coll_ptr)
+			break;
+		if (!valid_country(data, size, country))
+			return false;
+		country++;
+	}
+
+	return true;
+}
+
+static void set_wmm_rule(const struct fwdb_header *db,
+			 const struct fwdb_country *country,
+			 const struct fwdb_rule *rule,
+			 struct ieee80211_reg_rule *rrule)
+{
+	struct ieee80211_wmm_rule *wmm_rule = &rrule->wmm_rule;
+	struct fwdb_wmm_rule *wmm;
+	unsigned int i, wmm_ptr;
+
+	wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
+	wmm = (void *)((u8 *)db + wmm_ptr);
+
+	if (!valid_wmm(wmm)) {
+		pr_err("Invalid regulatory WMM rule %u-%u in domain %c%c\n",
+		       be32_to_cpu(rule->start), be32_to_cpu(rule->end),
+		       country->alpha2[0], country->alpha2[1]);
+		return;
+	}
+
+	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+		wmm_rule->client[i].cw_min =
+			ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
+		wmm_rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
+		wmm_rule->client[i].aifsn =  wmm->client[i].aifsn;
+		wmm_rule->client[i].cot =
+			1000 * be16_to_cpu(wmm->client[i].cot);
+		wmm_rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
+		wmm_rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
+		wmm_rule->ap[i].aifsn = wmm->ap[i].aifsn;
+		wmm_rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
+	}
+
+	rrule->has_wmm = true;
+}
+
+static int __regdb_query_wmm(const struct fwdb_header *db,
+			     const struct fwdb_country *country, int freq,
+			     struct ieee80211_reg_rule *rrule)
+{
+	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
+	struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
+	int i;
+
+	for (i = 0; i < coll->n_rules; i++) {
+		__be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
+		unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
+		struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
+
+		if (rule->len < offsetofend(struct fwdb_rule, wmm_ptr))
+			continue;
+
+		if (freq >= KHZ_TO_MHZ(be32_to_cpu(rule->start)) &&
+		    freq <= KHZ_TO_MHZ(be32_to_cpu(rule->end))) {
+			set_wmm_rule(db, country, rule, rrule);
+			return 0;
+		}
+	}
+
+	return -ENODATA;
+}
+
+int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
+{
+	const struct fwdb_header *hdr = regdb;
+	const struct fwdb_country *country;
+
+	if (!regdb)
+		return -ENODATA;
+
+	if (IS_ERR(regdb))
+		return PTR_ERR(regdb);
+
+	country = &hdr->country[0];
+	while (country->coll_ptr) {
+		if (alpha2_equal(alpha2, country->alpha2))
+			return __regdb_query_wmm(regdb, country, freq, rule);
+
+		country++;
+	}
+
+	return -ENODATA;
+}
+EXPORT_SYMBOL(reg_query_regdb_wmm);
+
+static int regdb_query_country(const struct fwdb_header *db,
+			       const struct fwdb_country *country)
+{
+	unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
+	struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
+	struct ieee80211_regdomain *regdom;
+	unsigned int i;
+
+	regdom = kzalloc(struct_size(regdom, reg_rules, coll->n_rules),
+			 GFP_KERNEL);
+	if (!regdom)
+		return -ENOMEM;
+
+	regdom->n_reg_rules = coll->n_rules;
+	regdom->alpha2[0] = country->alpha2[0];
+	regdom->alpha2[1] = country->alpha2[1];
+	regdom->dfs_region = coll->dfs_region;
+
+	for (i = 0; i < regdom->n_reg_rules; i++) {
+		__be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
+		unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
+		struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
+		struct ieee80211_reg_rule *rrule = &regdom->reg_rules[i];
+
+		rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
+		rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
+		rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
+
+		rrule->power_rule.max_antenna_gain = 0;
+		rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
+
+		rrule->flags = 0;
+		if (rule->flags & FWDB_FLAG_NO_OFDM)
+			rrule->flags |= NL80211_RRF_NO_OFDM;
+		if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
+			rrule->flags |= NL80211_RRF_NO_OUTDOOR;
+		if (rule->flags & FWDB_FLAG_DFS)
+			rrule->flags |= NL80211_RRF_DFS;
+		if (rule->flags & FWDB_FLAG_NO_IR)
+			rrule->flags |= NL80211_RRF_NO_IR;
+		if (rule->flags & FWDB_FLAG_AUTO_BW)
+			rrule->flags |= NL80211_RRF_AUTO_BW;
+
+		rrule->dfs_cac_ms = 0;
+
+		/* handle optional data */
+		if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
+			rrule->dfs_cac_ms =
+				1000 * be16_to_cpu(rule->cac_timeout);
+		if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr))
+			set_wmm_rule(db, country, rule, rrule);
+	}
+
+	return reg_schedule_apply(regdom);
+}
+
+static int query_regdb(const char *alpha2)
+{
+	const struct fwdb_header *hdr = regdb;
+	const struct fwdb_country *country;
+
+	ASSERT_RTNL();
+
+	if (IS_ERR(regdb))
+		return PTR_ERR(regdb);
+
+	country = &hdr->country[0];
+	while (country->coll_ptr) {
+		if (alpha2_equal(alpha2, country->alpha2))
+			return regdb_query_country(regdb, country);
+		country++;
+	}
+
+	return -ENODATA;
+}
+
+static void regdb_fw_cb(const struct firmware *fw, void *context)
+{
+	int set_error = 0;
+	bool restore = true;
+	void *db;
+
+	if (!fw) {
+		pr_info("failed to load regulatory.db\n");
+		set_error = -ENODATA;
+	} else if (!valid_regdb(fw->data, fw->size)) {
+		pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
+		set_error = -EINVAL;
+	}
+
+	rtnl_lock();
+	if (regdb && !IS_ERR(regdb)) {
+		/* negative case - a bug
+		 * positive case - can happen due to race in case of multiple cb's in
+		 * queue, due to usage of asynchronous callback
+		 *
+		 * Either case, just restore and free new db.
+		 */
+	} else if (set_error) {
+		regdb = ERR_PTR(set_error);
+	} else if (fw) {
+		db = kmemdup(fw->data, fw->size, GFP_KERNEL);
+		if (db) {
+			regdb = db;
+			restore = context && query_regdb(context);
+		} else {
+			restore = true;
+		}
+	}
+
+	if (restore)
+		restore_regulatory_settings(true, false);
+
+	rtnl_unlock();
+
+	kfree(context);
+
+	release_firmware(fw);
+}
+
+MODULE_FIRMWARE("regulatory.db");
+
+static int query_regdb_file(const char *alpha2)
+{
+	int err;
+
+	ASSERT_RTNL();
+
+	if (regdb)
+		return query_regdb(alpha2);
+
+	alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
+	if (!alpha2)
+		return -ENOMEM;
+
+	err = request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
+				      &reg_pdev->dev, GFP_KERNEL,
+				      (void *)alpha2, regdb_fw_cb);
+	if (err)
+		kfree(alpha2);
+
+	return err;
+}
+
+int reg_reload_regdb(void)
+{
+	const struct firmware *fw;
+	void *db;
+	int err;
+
+	err = request_firmware(&fw, "regulatory.db", &reg_pdev->dev);
+	if (err)
+		return err;
+
+	if (!valid_regdb(fw->data, fw->size)) {
+		err = -ENODATA;
+		goto out;
+	}
+
+	db = kmemdup(fw->data, fw->size, GFP_KERNEL);
+	if (!db) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	rtnl_lock();
+	if (!IS_ERR_OR_NULL(regdb))
+		kfree(regdb);
+	regdb = db;
+	rtnl_unlock();
+
+ out:
+	release_firmware(fw);
+	return err;
+}
+
+static bool reg_query_database(struct regulatory_request *request)
+{
+	if (query_regdb_file(request->alpha2) == 0)
+		return true;
+
+	if (call_crda(request->alpha2) == 0)
+		return true;
+
+	return false;
+}
+
+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);
+}
+
+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();
+}
+
+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;
+}
+
+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;
+}
+
+/* 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;
+}
+
+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;
+}
+
+/**
+ * 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 20 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 ?
+			20 * 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
+}
+
+/*
+ * 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;
+}
+
+static void reg_wmm_rules_intersect(const struct ieee80211_wmm_ac *wmm_ac1,
+				    const struct ieee80211_wmm_ac *wmm_ac2,
+				    struct ieee80211_wmm_ac *intersect)
+{
+	intersect->cw_min = max_t(u16, wmm_ac1->cw_min, wmm_ac2->cw_min);
+	intersect->cw_max = max_t(u16, wmm_ac1->cw_max, wmm_ac2->cw_max);
+	intersect->cot = min_t(u16, wmm_ac1->cot, wmm_ac2->cot);
+	intersect->aifsn = max_t(u8, wmm_ac1->aifsn, wmm_ac2->aifsn);
+}
+
+/*
+ * 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;
+	const struct ieee80211_wmm_rule *wmm_rule1, *wmm_rule2;
+	struct ieee80211_wmm_rule *wmm_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;
+
+	wmm_rule1 = &rule1->wmm_rule;
+	wmm_rule2 = &rule2->wmm_rule;
+	wmm_rule = &intersected_rule->wmm_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);
+
+	max_bandwidth1 = freq_range1->max_bandwidth_khz;
+	max_bandwidth2 = freq_range2->max_bandwidth_khz;
+
+	if (rule1->flags & NL80211_RRF_AUTO_BW)
+		max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
+	if (rule2->flags & NL80211_RRF_AUTO_BW)
+		max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
+
+	freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
+
+	intersected_rule->flags = rule1->flags | rule2->flags;
+
+	/*
+	 * In case NL80211_RRF_AUTO_BW requested for both rules
+	 * set AUTO_BW in intersected rule also. Next we will
+	 * calculate BW correctly in handle_channel function.
+	 * In other case remove AUTO_BW flag while we calculate
+	 * maximum bandwidth correctly and auto calculation is
+	 * not required.
+	 */
+	if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
+	    (rule2->flags & NL80211_RRF_AUTO_BW))
+		intersected_rule->flags |= NL80211_RRF_AUTO_BW;
+	else
+		intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
+
+	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->dfs_cac_ms = max(rule1->dfs_cac_ms,
+					   rule2->dfs_cac_ms);
+
+	if (rule1->has_wmm && rule2->has_wmm) {
+		u8 ac;
+
+		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+			reg_wmm_rules_intersect(&wmm_rule1->client[ac],
+						&wmm_rule2->client[ac],
+						&wmm_rule->client[ac]);
+			reg_wmm_rules_intersect(&wmm_rule1->ap[ac],
+						&wmm_rule2->ap[ac],
+						&wmm_rule->ap[ac]);
+		}
+
+		intersected_rule->has_wmm = true;
+	} else if (rule1->has_wmm) {
+		*wmm_rule = *wmm_rule1;
+		intersected_rule->has_wmm = true;
+	} else if (rule2->has_wmm) {
+		*wmm_rule = *wmm_rule2;
+		intersected_rule->has_wmm = true;
+	} else {
+		intersected_rule->has_wmm = false;
+	}
+
+	if (!is_valid_reg_rule(intersected_rule))
+		return -EINVAL;
+
+	return 0;
+}
+
+/* check whether old rule contains new rule */
+static bool rule_contains(struct ieee80211_reg_rule *r1,
+			  struct ieee80211_reg_rule *r2)
+{
+	/* for simplicity, currently consider only same flags */
+	if (r1->flags != r2->flags)
+		return false;
+
+	/* verify r1 is more restrictive */
+	if ((r1->power_rule.max_antenna_gain >
+	     r2->power_rule.max_antenna_gain) ||
+	    r1->power_rule.max_eirp > r2->power_rule.max_eirp)
+		return false;
+
+	/* make sure r2's range is contained within r1 */
+	if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
+	    r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
+		return false;
+
+	/* and finally verify that r1.max_bw >= r2.max_bw */
+	if (r1->freq_range.max_bandwidth_khz <
+	    r2->freq_range.max_bandwidth_khz)
+		return false;
+
+	return true;
+}
+
+/* add or extend current rules. do nothing if rule is already contained */
+static void add_rule(struct ieee80211_reg_rule *rule,
+		     struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
+{
+	struct ieee80211_reg_rule *tmp_rule;
+	int i;
+
+	for (i = 0; i < *n_rules; i++) {
+		tmp_rule = &reg_rules[i];
+		/* rule is already contained - do nothing */
+		if (rule_contains(tmp_rule, rule))
+			return;
+
+		/* extend rule if possible */
+		if (rule_contains(rule, tmp_rule)) {
+			memcpy(tmp_rule, rule, sizeof(*rule));
+			return;
+		}
+	}
+
+	memcpy(&reg_rules[*n_rules], rule, sizeof(*rule));
+	(*n_rules)++;
+}
+
+/**
+ * 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;
+	unsigned int x, y;
+	unsigned int num_rules = 0;
+	const struct ieee80211_reg_rule *rule1, *rule2;
+	struct ieee80211_reg_rule intersected_rule;
+	struct ieee80211_regdomain *rd;
+
+	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(rd1, rd2, rule1, rule2,
+						 &intersected_rule))
+				num_rules++;
+		}
+	}
+
+	if (!num_rules)
+		return NULL;
+
+	rd = kzalloc(struct_size(rd, reg_rules, num_rules), GFP_KERNEL);
+	if (!rd)
+		return NULL;
+
+	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];
+			r = reg_rules_intersect(rd1, rd2, rule1, rule2,
+						&intersected_rule);
+			/*
+			 * No need to memset here the intersected rule here as
+			 * we're not using the stack anymore
+			 */
+			if (r)
+				continue;
+
+			add_rule(&intersected_rule, rd->reg_rules,
+				 &rd->n_reg_rules);
+		}
+	}
+
+	rd->alpha2[0] = '9';
+	rd->alpha2[1] = '8';
+	rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
+						  rd2->dfs_region);
+
+	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_NO_IR_ALL)
+		channel_flags |= IEEE80211_CHAN_NO_IR;
+	if (rd_flags & NL80211_RRF_DFS)
+		channel_flags |= IEEE80211_CHAN_RADAR;
+	if (rd_flags & NL80211_RRF_NO_OFDM)
+		channel_flags |= IEEE80211_CHAN_NO_OFDM;
+	if (rd_flags & NL80211_RRF_NO_OUTDOOR)
+		channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
+	if (rd_flags & NL80211_RRF_IR_CONCURRENT)
+		channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
+	if (rd_flags & NL80211_RRF_NO_HT40MINUS)
+		channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
+	if (rd_flags & NL80211_RRF_NO_HT40PLUS)
+		channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
+	if (rd_flags & NL80211_RRF_NO_80MHZ)
+		channel_flags |= IEEE80211_CHAN_NO_80MHZ;
+	if (rd_flags & NL80211_RRF_NO_160MHZ)
+		channel_flags |= IEEE80211_CHAN_NO_160MHZ;
+	if (rd_flags & NL80211_RRF_NO_HE)
+		channel_flags |= IEEE80211_CHAN_NO_HE;
+	return channel_flags;
+}
+
+static const struct ieee80211_reg_rule *
+freq_reg_info_regd(u32 center_freq,
+		   const struct ieee80211_regdomain *regd, u32 bw)
+{
+	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 = &regd->reg_rules[i];
+		fr = &rr->freq_range;
+
+		/*
+		 * We only need to know if one frequency rule was
+		 * in center_freq's band, that's enough, so let's
+		 * not overwrite it once found
+		 */
+		if (!band_rule_found)
+			band_rule_found = freq_in_rule_band(fr, center_freq);
+
+		bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
+
+		if (band_rule_found && bw_fits)
+			return rr;
+	}
+
+	if (!band_rule_found)
+		return ERR_PTR(-ERANGE);
+
+	return ERR_PTR(-EINVAL);
+}
+
+static const struct ieee80211_reg_rule *
+__freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
+{
+	const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
+	const u32 bws[] = {0, 1, 2, 4, 5, 8, 10, 16, 20};
+	const struct ieee80211_reg_rule *reg_rule;
+	int i = ARRAY_SIZE(bws) - 1;
+	u32 bw;
+
+	for (bw = MHZ_TO_KHZ(bws[i]); bw >= min_bw; bw = MHZ_TO_KHZ(bws[i--])) {
+		reg_rule = freq_reg_info_regd(center_freq, regd, bw);
+		if (!IS_ERR(reg_rule))
+			return reg_rule;
+	}
+
+	return reg_rule;
+}
+
+const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
+					       u32 center_freq)
+{
+	u32 min_bw = center_freq < MHZ_TO_KHZ(1000) ? 1 : 20;
+
+	return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(min_bw));
+}
+EXPORT_SYMBOL(freq_reg_info);
+
+const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
+{
+	switch (initiator) {
+	case NL80211_REGDOM_SET_BY_CORE:
+		return "core";
+	case NL80211_REGDOM_SET_BY_USER:
+		return "user";
+	case NL80211_REGDOM_SET_BY_DRIVER:
+		return "driver";
+	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+		return "country element";
+	default:
+		WARN_ON(1);
+		return "bug";
+	}
+}
+EXPORT_SYMBOL(reg_initiator_name);
+
+static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
+					  const struct ieee80211_reg_rule *reg_rule,
+					  const struct ieee80211_channel *chan)
+{
+	const struct ieee80211_freq_range *freq_range = NULL;
+	u32 max_bandwidth_khz, center_freq_khz, bw_flags = 0;
+	bool is_s1g = chan->band == NL80211_BAND_S1GHZ;
+
+	freq_range = &reg_rule->freq_range;
+
+	max_bandwidth_khz = freq_range->max_bandwidth_khz;
+	center_freq_khz = ieee80211_channel_to_khz(chan);
+	/* Check if auto calculation requested */
+	if (reg_rule->flags & NL80211_RRF_AUTO_BW)
+		max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
+
+	/* If we get a reg_rule we can assume that at least 5Mhz fit */
+	if (!cfg80211_does_bw_fit_range(freq_range,
+					center_freq_khz,
+					MHZ_TO_KHZ(10)))
+		bw_flags |= IEEE80211_CHAN_NO_10MHZ;
+	if (!cfg80211_does_bw_fit_range(freq_range,
+					center_freq_khz,
+					MHZ_TO_KHZ(20)))
+		bw_flags |= IEEE80211_CHAN_NO_20MHZ;
+
+	if (is_s1g) {
+		/* S1G is strict about non overlapping channels. We can
+		 * calculate which bandwidth is allowed per channel by finding
+		 * the largest bandwidth which cleanly divides the freq_range.
+		 */
+		int edge_offset;
+		int ch_bw = max_bandwidth_khz;
+
+		while (ch_bw) {
+			edge_offset = (center_freq_khz - ch_bw / 2) -
+				      freq_range->start_freq_khz;
+			if (edge_offset % ch_bw == 0) {
+				switch (KHZ_TO_MHZ(ch_bw)) {
+				case 1:
+					bw_flags |= IEEE80211_CHAN_1MHZ;
+					break;
+				case 2:
+					bw_flags |= IEEE80211_CHAN_2MHZ;
+					break;
+				case 4:
+					bw_flags |= IEEE80211_CHAN_4MHZ;
+					break;
+				case 8:
+					bw_flags |= IEEE80211_CHAN_8MHZ;
+					break;
+				case 16:
+					bw_flags |= IEEE80211_CHAN_16MHZ;
+					break;
+				default:
+					/* If we got here, no bandwidths fit on
+					 * this frequency, ie. band edge.
+					 */
+					bw_flags |= IEEE80211_CHAN_DISABLED;
+					break;
+				}
+				break;
+			}
+			ch_bw /= 2;
+		}
+	} else {
+		if (max_bandwidth_khz < MHZ_TO_KHZ(10))
+			bw_flags |= IEEE80211_CHAN_NO_10MHZ;
+		if (max_bandwidth_khz < MHZ_TO_KHZ(20))
+			bw_flags |= IEEE80211_CHAN_NO_20MHZ;
+		if (max_bandwidth_khz < MHZ_TO_KHZ(40))
+			bw_flags |= IEEE80211_CHAN_NO_HT40;
+		if (max_bandwidth_khz < MHZ_TO_KHZ(80))
+			bw_flags |= IEEE80211_CHAN_NO_80MHZ;
+		if (max_bandwidth_khz < MHZ_TO_KHZ(160))
+			bw_flags |= IEEE80211_CHAN_NO_160MHZ;
+	}
+	return bw_flags;
+}
+
+static void handle_channel_single_rule(struct wiphy *wiphy,
+				       enum nl80211_reg_initiator initiator,
+				       struct ieee80211_channel *chan,
+				       u32 flags,
+				       struct regulatory_request *lr,
+				       struct wiphy *request_wiphy,
+				       const struct ieee80211_reg_rule *reg_rule)
+{
+	u32 bw_flags = 0;
+	const struct ieee80211_power_rule *power_rule = NULL;
+	const struct ieee80211_regdomain *regd;
+
+	regd = reg_get_regdomain(wiphy);
+
+	power_rule = &reg_rule->power_rule;
+	bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
+
+	if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+	    request_wiphy && request_wiphy == wiphy &&
+	    request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
+		/*
+		 * 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);
+
+		if (chan->flags & IEEE80211_CHAN_RADAR) {
+			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+			if (reg_rule->dfs_cac_ms)
+				chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
+		}
+
+		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->flags & IEEE80211_CHAN_RADAR) {
+		if (reg_rule->dfs_cac_ms)
+			chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
+		else
+			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+	}
+
+	if (chan->orig_mpwr) {
+		/*
+		 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
+		 * will always follow the passed country IE power settings.
+		 */
+		if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+		    wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
+			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_channel_adjacent_rules(struct wiphy *wiphy,
+					  enum nl80211_reg_initiator initiator,
+					  struct ieee80211_channel *chan,
+					  u32 flags,
+					  struct regulatory_request *lr,
+					  struct wiphy *request_wiphy,
+					  const struct ieee80211_reg_rule *rrule1,
+					  const struct ieee80211_reg_rule *rrule2,
+					  struct ieee80211_freq_range *comb_range)
+{
+	u32 bw_flags1 = 0;
+	u32 bw_flags2 = 0;
+	const struct ieee80211_power_rule *power_rule1 = NULL;
+	const struct ieee80211_power_rule *power_rule2 = NULL;
+	const struct ieee80211_regdomain *regd;
+
+	regd = reg_get_regdomain(wiphy);
+
+	power_rule1 = &rrule1->power_rule;
+	power_rule2 = &rrule2->power_rule;
+	bw_flags1 = reg_rule_to_chan_bw_flags(regd, rrule1, chan);
+	bw_flags2 = reg_rule_to_chan_bw_flags(regd, rrule2, chan);
+
+	if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+	    request_wiphy && request_wiphy == wiphy &&
+	    request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
+		/* This guarantees the driver's requested regulatory domain
+		 * will always be used as a base for further regulatory
+		 * settings
+		 */
+		chan->flags =
+			map_regdom_flags(rrule1->flags) |
+			map_regdom_flags(rrule2->flags) |
+			bw_flags1 |
+			bw_flags2;
+		chan->orig_flags = chan->flags;
+		chan->max_antenna_gain =
+			min_t(int, MBI_TO_DBI(power_rule1->max_antenna_gain),
+			      MBI_TO_DBI(power_rule2->max_antenna_gain));
+		chan->orig_mag = chan->max_antenna_gain;
+		chan->max_reg_power =
+			min_t(int, MBM_TO_DBM(power_rule1->max_eirp),
+			      MBM_TO_DBM(power_rule2->max_eirp));
+		chan->max_power = chan->max_reg_power;
+		chan->orig_mpwr = chan->max_reg_power;
+
+		if (chan->flags & IEEE80211_CHAN_RADAR) {
+			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+			if (rrule1->dfs_cac_ms || rrule2->dfs_cac_ms)
+				chan->dfs_cac_ms = max_t(unsigned int,
+							 rrule1->dfs_cac_ms,
+							 rrule2->dfs_cac_ms);
+		}
+
+		return;
+	}
+
+	chan->dfs_state = NL80211_DFS_USABLE;
+	chan->dfs_state_entered = jiffies;
+
+	chan->beacon_found = false;
+	chan->flags = flags | bw_flags1 | bw_flags2 |
+		      map_regdom_flags(rrule1->flags) |
+		      map_regdom_flags(rrule2->flags);
+
+	/* reg_rule_to_chan_bw_flags may forbids 10 and forbids 20 MHz
+	 * (otherwise no adj. rule case), recheck therefore
+	 */
+	if (cfg80211_does_bw_fit_range(comb_range,
+				       ieee80211_channel_to_khz(chan),
+				       MHZ_TO_KHZ(10)))
+		chan->flags &= ~IEEE80211_CHAN_NO_10MHZ;
+	if (cfg80211_does_bw_fit_range(comb_range,
+				       ieee80211_channel_to_khz(chan),
+				       MHZ_TO_KHZ(20)))
+		chan->flags &= ~IEEE80211_CHAN_NO_20MHZ;
+
+	chan->max_antenna_gain =
+		min_t(int, chan->orig_mag,
+		      min_t(int,
+			    MBI_TO_DBI(power_rule1->max_antenna_gain),
+			    MBI_TO_DBI(power_rule2->max_antenna_gain)));
+	chan->max_reg_power = min_t(int,
+				    MBM_TO_DBM(power_rule1->max_eirp),
+				    MBM_TO_DBM(power_rule2->max_eirp));
+
+	if (chan->flags & IEEE80211_CHAN_RADAR) {
+		if (rrule1->dfs_cac_ms || rrule2->dfs_cac_ms)
+			chan->dfs_cac_ms = max_t(unsigned int,
+						 rrule1->dfs_cac_ms,
+						 rrule2->dfs_cac_ms);
+		else
+			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+	}
+
+	if (chan->orig_mpwr) {
+		/* Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
+		 * will always follow the passed country IE power settings.
+		 */
+		if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+		    wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
+			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;
+	}
+}
+
+/* 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)
+{
+	const u32 orig_chan_freq = ieee80211_channel_to_khz(chan);
+	struct regulatory_request *lr = get_last_request();
+	struct wiphy *request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
+	const struct ieee80211_reg_rule *rrule = NULL;
+	const struct ieee80211_reg_rule *rrule1 = NULL;
+	const struct ieee80211_reg_rule *rrule2 = NULL;
+
+	u32 flags = chan->orig_flags;
+
+	rrule = freq_reg_info(wiphy, orig_chan_freq);
+	if (IS_ERR(rrule)) {
+		/* check for adjacent match, therefore get rules for
+		 * chan - 20 MHz and chan + 20 MHz and test
+		 * if reg rules are adjacent
+		 */
+		rrule1 = freq_reg_info(wiphy,
+				       orig_chan_freq - MHZ_TO_KHZ(20));
+		rrule2 = freq_reg_info(wiphy,
+				       orig_chan_freq + MHZ_TO_KHZ(20));
+		if (!IS_ERR(rrule1) && !IS_ERR(rrule2)) {
+			struct ieee80211_freq_range comb_range;
+
+			if (rrule1->freq_range.end_freq_khz !=
+			    rrule2->freq_range.start_freq_khz)
+				goto disable_chan;
+
+			comb_range.start_freq_khz =
+				rrule1->freq_range.start_freq_khz;
+			comb_range.end_freq_khz =
+				rrule2->freq_range.end_freq_khz;
+			comb_range.max_bandwidth_khz =
+				min_t(u32,
+				      rrule1->freq_range.max_bandwidth_khz,
+				      rrule2->freq_range.max_bandwidth_khz);
+
+			if (!cfg80211_does_bw_fit_range(&comb_range,
+							orig_chan_freq,
+							MHZ_TO_KHZ(20)))
+				goto disable_chan;
+
+			handle_channel_adjacent_rules(wiphy, initiator, chan,
+						      flags, lr, request_wiphy,
+						      rrule1, rrule2,
+						      &comb_range);
+			return;
+		}
+
+disable_chan:
+		/* 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(rrule) == -ERANGE)
+			return;
+
+		if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+		    request_wiphy && request_wiphy == wiphy &&
+		    request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
+			pr_debug("Disabling freq %d.%03d MHz for good\n",
+				 chan->center_freq, chan->freq_offset);
+			chan->orig_flags |= IEEE80211_CHAN_DISABLED;
+			chan->flags = chan->orig_flags;
+		} else {
+			pr_debug("Disabling freq %d.%03d MHz\n",
+				 chan->center_freq, chan->freq_offset);
+			chan->flags |= IEEE80211_CHAN_DISABLED;
+		}
+		return;
+	}
+
+	handle_channel_single_rule(wiphy, initiator, chan, flags, lr,
+				   request_wiphy, rrule);
+}
+
+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)
+{
+	return reg_request_cell_base(get_last_request());
+}
+
+#ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
+/* 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 enum reg_request_treatment
+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 wiphy_strict_alpha2_regd(struct wiphy *wiphy)
+{
+	if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
+	    !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
+		return true;
+	return false;
+}
+
+static bool ignore_reg_update(struct wiphy *wiphy,
+			      enum nl80211_reg_initiator initiator)
+{
+	struct regulatory_request *lr = get_last_request();
+
+	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+		return true;
+
+	if (!lr) {
+		pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
+			 reg_initiator_name(initiator));
+		return true;
+	}
+
+	if (initiator == NL80211_REGDOM_SET_BY_CORE &&
+	    wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
+		pr_debug("Ignoring regulatory request set by %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_strict_alpha2_regd(wiphy) && !wiphy->regd &&
+	    initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+	    !is_world_regdom(lr->alpha2)) {
+		pr_debug("Ignoring regulatory request set by %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->regulatory_flags & REGULATORY_CUSTOM_REG)
+		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(!ieee80211_channel_equal(chan, &reg_beacon->chan)))
+		return;
+
+	if (chan->beacon_found)
+		return;
+
+	chan->beacon_found = true;
+
+	if (!reg_is_world_roaming(wiphy))
+		return;
+
+	if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
+		return;
+
+	chan_before = *chan;
+
+	if (chan->flags & IEEE80211_CHAN_NO_IR) {
+		chan->flags &= ~IEEE80211_CHAN_NO_IR;
+		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, &reg_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;
+	const struct ieee80211_regdomain *regd;
+	unsigned int i;
+	u32 flags;
+
+	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;
+	}
+
+	flags = 0;
+	regd = get_wiphy_regdom(wiphy);
+	if (regd) {
+		const struct ieee80211_reg_rule *reg_rule =
+			freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
+					   regd, MHZ_TO_KHZ(20));
+
+		if (!IS_ERR(reg_rule))
+			flags = reg_rule->flags;
+	}
+
+	/*
+	 * 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) ||
+	    flags & NL80211_RRF_NO_HT40MINUS)
+		channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
+	else
+		channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
+
+	if (!is_ht40_allowed(channel_after) ||
+	    flags & NL80211_RRF_NO_HT40PLUS)
+		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 nl80211_band band;
+
+	if (!wiphy)
+		return;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++)
+		reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
+}
+
+static void reg_call_notifier(struct wiphy *wiphy,
+			      struct regulatory_request *request)
+{
+	if (wiphy->reg_notifier)
+		wiphy->reg_notifier(wiphy, request);
+}
+
+static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
+{
+	struct cfg80211_chan_def chandef = {};
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	enum nl80211_iftype iftype;
+
+	wdev_lock(wdev);
+	iftype = wdev->iftype;
+
+	/* make sure the interface is active */
+	if (!wdev->netdev || !netif_running(wdev->netdev))
+		goto wdev_inactive_unlock;
+
+	switch (iftype) {
+	case NL80211_IFTYPE_AP:
+	case NL80211_IFTYPE_P2P_GO:
+		if (!wdev->beacon_interval)
+			goto wdev_inactive_unlock;
+		chandef = wdev->chandef;
+		break;
+	case NL80211_IFTYPE_ADHOC:
+		if (!wdev->ssid_len)
+			goto wdev_inactive_unlock;
+		chandef = wdev->chandef;
+		break;
+	case NL80211_IFTYPE_STATION:
+	case NL80211_IFTYPE_P2P_CLIENT:
+		if (!wdev->current_bss ||
+		    !wdev->current_bss->pub.channel)
+			goto wdev_inactive_unlock;
+
+		if (!rdev->ops->get_channel ||
+		    rdev_get_channel(rdev, wdev, &chandef))
+			cfg80211_chandef_create(&chandef,
+						wdev->current_bss->pub.channel,
+						NL80211_CHAN_NO_HT);
+		break;
+	case NL80211_IFTYPE_MONITOR:
+	case NL80211_IFTYPE_AP_VLAN:
+	case NL80211_IFTYPE_P2P_DEVICE:
+		/* no enforcement required */
+		break;
+	default:
+		/* others not implemented for now */
+		WARN_ON(1);
+		break;
+	}
+
+	wdev_unlock(wdev);
+
+	switch (iftype) {
+	case NL80211_IFTYPE_AP:
+	case NL80211_IFTYPE_P2P_GO:
+	case NL80211_IFTYPE_ADHOC:
+		return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
+	case NL80211_IFTYPE_STATION:
+	case NL80211_IFTYPE_P2P_CLIENT:
+		return cfg80211_chandef_usable(wiphy, &chandef,
+					       IEEE80211_CHAN_DISABLED);
+	default:
+		break;
+	}
+
+	return true;
+
+wdev_inactive_unlock:
+	wdev_unlock(wdev);
+	return true;
+}
+
+static void reg_leave_invalid_chans(struct wiphy *wiphy)
+{
+	struct wireless_dev *wdev;
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+	ASSERT_RTNL();
+
+	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
+		if (!reg_wdev_chan_valid(wiphy, wdev))
+			cfg80211_leave(rdev, wdev);
+}
+
+static void reg_check_chans_work(struct work_struct *work)
+{
+	struct cfg80211_registered_device *rdev;
+
+	pr_debug("Verifying active interfaces after reg change\n");
+	rtnl_lock();
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+		if (!(rdev->wiphy.regulatory_flags &
+		      REGULATORY_IGNORE_STALE_KICKOFF))
+			reg_leave_invalid_chans(&rdev->wiphy);
+
+	rtnl_unlock();
+}
+
+static void reg_check_channels(void)
+{
+	/*
+	 * Give usermode a chance to do something nicer (move to another
+	 * channel, orderly disconnection), before forcing a disconnection.
+	 */
+	mod_delayed_work(system_power_efficient_wq,
+			 &reg_check_chans,
+			 msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
+}
+
+static void wiphy_update_regulatory(struct wiphy *wiphy,
+				    enum nl80211_reg_initiator initiator)
+{
+	enum nl80211_band band;
+	struct regulatory_request *lr = get_last_request();
+
+	if (ignore_reg_update(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->regulatory_flags & REGULATORY_CUSTOM_REG &&
+		    !(wiphy->regulatory_flags &
+		      REGULATORY_WIPHY_SELF_MANAGED))
+			reg_call_notifier(wiphy, lr);
+		return;
+	}
+
+	lr->dfs_region = get_cfg80211_regdom()->dfs_region;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++)
+		handle_band(wiphy, initiator, wiphy->bands[band]);
+
+	reg_process_beacons(wiphy);
+	reg_process_ht_flags(wiphy);
+	reg_call_notifier(wiphy, lr);
+}
+
+static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wiphy *wiphy;
+
+	ASSERT_RTNL();
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		wiphy = &rdev->wiphy;
+		wiphy_update_regulatory(wiphy, initiator);
+	}
+
+	reg_check_channels();
+}
+
+static void handle_channel_custom(struct wiphy *wiphy,
+				  struct ieee80211_channel *chan,
+				  const struct ieee80211_regdomain *regd,
+				  u32 min_bw)
+{
+	u32 bw_flags = 0;
+	const struct ieee80211_reg_rule *reg_rule = NULL;
+	const struct ieee80211_power_rule *power_rule = NULL;
+	u32 bw, center_freq_khz;
+
+	center_freq_khz = ieee80211_channel_to_khz(chan);
+	for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
+		reg_rule = freq_reg_info_regd(center_freq_khz, regd, bw);
+		if (!IS_ERR(reg_rule))
+			break;
+	}
+
+	if (IS_ERR_OR_NULL(reg_rule)) {
+		pr_debug("Disabling freq %d.%03d MHz as custom regd has no rule that fits it\n",
+			 chan->center_freq, chan->freq_offset);
+		if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
+			chan->flags |= IEEE80211_CHAN_DISABLED;
+		} else {
+			chan->orig_flags |= IEEE80211_CHAN_DISABLED;
+			chan->flags = chan->orig_flags;
+		}
+		return;
+	}
+
+	power_rule = &reg_rule->power_rule;
+	bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
+
+	chan->dfs_state_entered = jiffies;
+	chan->dfs_state = NL80211_DFS_USABLE;
+
+	chan->beacon_found = false;
+
+	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+		chan->flags = chan->orig_flags | bw_flags |
+			      map_regdom_flags(reg_rule->flags);
+	else
+		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);
+
+	if (chan->flags & IEEE80211_CHAN_RADAR) {
+		if (reg_rule->dfs_cac_ms)
+			chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
+		else
+			chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+	}
+
+	chan->max_power = chan->max_reg_power;
+}
+
+static void handle_band_custom(struct wiphy *wiphy,
+			       struct ieee80211_supported_band *sband,
+			       const struct ieee80211_regdomain *regd)
+{
+	unsigned int i;
+
+	if (!sband)
+		return;
+
+	/*
+	 * We currently assume that you always want at least 20 MHz,
+	 * otherwise channel 12 might get enabled if this rule is
+	 * compatible to US, which permits 2402 - 2472 MHz.
+	 */
+	for (i = 0; i < sband->n_channels; i++)
+		handle_channel_custom(wiphy, &sband->channels[i], regd,
+				      MHZ_TO_KHZ(20));
+}
+
+/* Used by drivers prior to wiphy registration */
+void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
+				   const struct ieee80211_regdomain *regd)
+{
+	enum nl80211_band band;
+	unsigned int bands_set = 0;
+
+	WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
+	     "wiphy should have REGULATORY_CUSTOM_REG\n");
+	wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
+
+	for (band = 0; band < NUM_NL80211_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);
+
+static void reg_set_request_processed(void)
+{
+	bool need_more_processing = false;
+	struct regulatory_request *lr = get_last_request();
+
+	lr->processed = true;
+
+	spin_lock(&reg_requests_lock);
+	if (!list_empty(&reg_requests_list))
+		need_more_processing = true;
+	spin_unlock(&reg_requests_lock);
+
+	cancel_crda_timeout();
+
+	if (need_more_processing)
+		schedule_work(&reg_work);
+}
+
+/**
+ * reg_process_hint_core - process core regulatory requests
+ * @core_request: a pending core regulatory request
+ *
+ * The wireless subsystem can use this function to process
+ * a regulatory request issued by the regulatory core.
+ */
+static enum reg_request_treatment
+reg_process_hint_core(struct regulatory_request *core_request)
+{
+	if (reg_query_database(core_request)) {
+		core_request->intersect = false;
+		core_request->processed = false;
+		reg_update_last_request(core_request);
+		return REG_REQ_OK;
+	}
+
+	return REG_REQ_IGNORE;
+}
+
+static enum reg_request_treatment
+__reg_process_hint_user(struct regulatory_request *user_request)
+{
+	struct regulatory_request *lr = get_last_request();
+
+	if (reg_request_cell_base(user_request))
+		return reg_ignore_cell_hint(user_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(user_request->alpha2))
+		return REG_REQ_ALREADY_SET;
+
+	return REG_REQ_OK;
+}
+
+/**
+ * reg_process_hint_user - process user regulatory requests
+ * @user_request: a pending user regulatory request
+ *
+ * The wireless subsystem can use this function to process
+ * a regulatory request initiated by userspace.
+ */
+static enum reg_request_treatment
+reg_process_hint_user(struct regulatory_request *user_request)
+{
+	enum reg_request_treatment treatment;
+
+	treatment = __reg_process_hint_user(user_request);
+	if (treatment == REG_REQ_IGNORE ||
+	    treatment == REG_REQ_ALREADY_SET)
+		return REG_REQ_IGNORE;
+
+	user_request->intersect = treatment == REG_REQ_INTERSECT;
+	user_request->processed = false;
+
+	if (reg_query_database(user_request)) {
+		reg_update_last_request(user_request);
+		user_alpha2[0] = user_request->alpha2[0];
+		user_alpha2[1] = user_request->alpha2[1];
+		return REG_REQ_OK;
+	}
+
+	return REG_REQ_IGNORE;
+}
+
+static enum reg_request_treatment
+__reg_process_hint_driver(struct regulatory_request *driver_request)
+{
+	struct regulatory_request *lr = get_last_request();
+
+	if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
+		if (regdom_changes(driver_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(driver_request->alpha2))
+		return REG_REQ_ALREADY_SET;
+
+	return REG_REQ_INTERSECT;
+}
+
+/**
+ * reg_process_hint_driver - process driver regulatory requests
+ * @wiphy: the wireless device for the regulatory request
+ * @driver_request: a pending driver regulatory request
+ *
+ * The wireless subsystem can use this function to process
+ * a regulatory request issued by an 802.11 driver.
+ *
+ * Returns one of the different reg request treatment values.
+ */
+static enum reg_request_treatment
+reg_process_hint_driver(struct wiphy *wiphy,
+			struct regulatory_request *driver_request)
+{
+	const struct ieee80211_regdomain *regd, *tmp;
+	enum reg_request_treatment treatment;
+
+	treatment = __reg_process_hint_driver(driver_request);
+
+	switch (treatment) {
+	case REG_REQ_OK:
+		break;
+	case REG_REQ_IGNORE:
+		return REG_REQ_IGNORE;
+	case REG_REQ_INTERSECT:
+	case REG_REQ_ALREADY_SET:
+		regd = reg_copy_regd(get_cfg80211_regdom());
+		if (IS_ERR(regd))
+			return REG_REQ_IGNORE;
+
+		tmp = get_wiphy_regdom(wiphy);
+		rcu_assign_pointer(wiphy->regd, regd);
+		rcu_free_regdom(tmp);
+	}
+
+
+	driver_request->intersect = treatment == REG_REQ_INTERSECT;
+	driver_request->processed = false;
+
+	/*
+	 * 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(driver_request);
+		reg_update_last_request(driver_request);
+		reg_set_request_processed();
+		return REG_REQ_ALREADY_SET;
+	}
+
+	if (reg_query_database(driver_request)) {
+		reg_update_last_request(driver_request);
+		return REG_REQ_OK;
+	}
+
+	return REG_REQ_IGNORE;
+}
+
+static enum reg_request_treatment
+__reg_process_hint_country_ie(struct wiphy *wiphy,
+			      struct regulatory_request *country_ie_request)
+{
+	struct wiphy *last_wiphy = NULL;
+	struct regulatory_request *lr = get_last_request();
+
+	if (reg_request_cell_base(lr)) {
+		/* Trust a Cell base station over the AP's country IE */
+		if (regdom_changes(country_ie_request->alpha2))
+			return REG_REQ_IGNORE;
+		return REG_REQ_ALREADY_SET;
+	} else {
+		if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
+			return REG_REQ_IGNORE;
+	}
+
+	if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
+		return -EINVAL;
+
+	if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
+		return REG_REQ_OK;
+
+	last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
+
+	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(country_ie_request->alpha2))
+			return REG_REQ_IGNORE;
+		return REG_REQ_ALREADY_SET;
+	}
+
+	if (regdom_changes(country_ie_request->alpha2))
+		return REG_REQ_OK;
+	return REG_REQ_ALREADY_SET;
+}
+
+/**
+ * reg_process_hint_country_ie - process regulatory requests from country IEs
+ * @wiphy: the wireless device for the regulatory request
+ * @country_ie_request: a regulatory request from a country IE
+ *
+ * The wireless subsystem can use this function to process
+ * a regulatory request issued by a country Information Element.
+ *
+ * Returns one of the different reg request treatment values.
+ */
+static enum reg_request_treatment
+reg_process_hint_country_ie(struct wiphy *wiphy,
+			    struct regulatory_request *country_ie_request)
+{
+	enum reg_request_treatment treatment;
+
+	treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
+
+	switch (treatment) {
+	case REG_REQ_OK:
+		break;
+	case REG_REQ_IGNORE:
+		return REG_REQ_IGNORE;
+	case REG_REQ_ALREADY_SET:
+		reg_free_request(country_ie_request);
+		return REG_REQ_ALREADY_SET;
+	case REG_REQ_INTERSECT:
+		/*
+		 * This doesn't happen yet, not sure we
+		 * ever want to support it for this case.
+		 */
+		WARN_ONCE(1, "Unexpected intersection for country elements");
+		return REG_REQ_IGNORE;
+	}
+
+	country_ie_request->intersect = false;
+	country_ie_request->processed = false;
+
+	if (reg_query_database(country_ie_request)) {
+		reg_update_last_request(country_ie_request);
+		return REG_REQ_OK;
+	}
+
+	return REG_REQ_IGNORE;
+}
+
+bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
+{
+	const struct ieee80211_regdomain *wiphy1_regd = NULL;
+	const struct ieee80211_regdomain *wiphy2_regd = NULL;
+	const struct ieee80211_regdomain *cfg80211_regd = NULL;
+	bool dfs_domain_same;
+
+	rcu_read_lock();
+
+	cfg80211_regd = rcu_dereference(cfg80211_regdomain);
+	wiphy1_regd = rcu_dereference(wiphy1->regd);
+	if (!wiphy1_regd)
+		wiphy1_regd = cfg80211_regd;
+
+	wiphy2_regd = rcu_dereference(wiphy2->regd);
+	if (!wiphy2_regd)
+		wiphy2_regd = cfg80211_regd;
+
+	dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
+
+	rcu_read_unlock();
+
+	return dfs_domain_same;
+}
+
+static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
+				    struct ieee80211_channel *src_chan)
+{
+	if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
+	    !(src_chan->flags & IEEE80211_CHAN_RADAR))
+		return;
+
+	if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
+	    src_chan->flags & IEEE80211_CHAN_DISABLED)
+		return;
+
+	if (src_chan->center_freq == dst_chan->center_freq &&
+	    dst_chan->dfs_state == NL80211_DFS_USABLE) {
+		dst_chan->dfs_state = src_chan->dfs_state;
+		dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
+	}
+}
+
+static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
+				       struct wiphy *src_wiphy)
+{
+	struct ieee80211_supported_band *src_sband, *dst_sband;
+	struct ieee80211_channel *src_chan, *dst_chan;
+	int i, j, band;
+
+	if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
+		return;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++) {
+		dst_sband = dst_wiphy->bands[band];
+		src_sband = src_wiphy->bands[band];
+		if (!dst_sband || !src_sband)
+			continue;
+
+		for (i = 0; i < dst_sband->n_channels; i++) {
+			dst_chan = &dst_sband->channels[i];
+			for (j = 0; j < src_sband->n_channels; j++) {
+				src_chan = &src_sband->channels[j];
+				reg_copy_dfs_chan_state(dst_chan, src_chan);
+			}
+		}
+	}
+}
+
+static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
+{
+	struct cfg80211_registered_device *rdev;
+
+	ASSERT_RTNL();
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		if (wiphy == &rdev->wiphy)
+			continue;
+		wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
+	}
+}
+
+/* This processes *all* regulatory hints */
+static void reg_process_hint(struct regulatory_request *reg_request)
+{
+	struct wiphy *wiphy = NULL;
+	enum reg_request_treatment treatment;
+	enum nl80211_reg_initiator initiator = reg_request->initiator;
+
+	if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
+		wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
+
+	switch (initiator) {
+	case NL80211_REGDOM_SET_BY_CORE:
+		treatment = reg_process_hint_core(reg_request);
+		break;
+	case NL80211_REGDOM_SET_BY_USER:
+		treatment = reg_process_hint_user(reg_request);
+		break;
+	case NL80211_REGDOM_SET_BY_DRIVER:
+		if (!wiphy)
+			goto out_free;
+		treatment = reg_process_hint_driver(wiphy, reg_request);
+		break;
+	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+		if (!wiphy)
+			goto out_free;
+		treatment = reg_process_hint_country_ie(wiphy, reg_request);
+		break;
+	default:
+		WARN(1, "invalid initiator %d\n", initiator);
+		goto out_free;
+	}
+
+	if (treatment == REG_REQ_IGNORE)
+		goto out_free;
+
+	WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
+	     "unexpected treatment value %d\n", treatment);
+
+	/* This is required so that the orig_* parameters are saved.
+	 * NOTE: treatment must be set for any case that reaches here!
+	 */
+	if (treatment == REG_REQ_ALREADY_SET && wiphy &&
+	    wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
+		wiphy_update_regulatory(wiphy, initiator);
+		wiphy_all_share_dfs_chan_state(wiphy);
+		reg_check_channels();
+	}
+
+	return;
+
+out_free:
+	reg_free_request(reg_request);
+}
+
+static void notify_self_managed_wiphys(struct regulatory_request *request)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wiphy *wiphy;
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		wiphy = &rdev->wiphy;
+		if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
+		    request->initiator == NL80211_REGDOM_SET_BY_USER)
+			reg_call_notifier(wiphy, request);
+	}
+}
+
+/*
+ * 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;
+
+	lr = get_last_request();
+
+	/* When last_request->processed becomes true this will be rescheduled */
+	if (lr && !lr->processed) {
+		pr_debug("Pending regulatory request, waiting for it to be processed...\n");
+		return;
+	}
+
+	spin_lock(&reg_requests_lock);
+
+	if (list_empty(&reg_requests_list)) {
+		spin_unlock(&reg_requests_lock);
+		return;
+	}
+
+	reg_request = list_first_entry(&reg_requests_list,
+				       struct regulatory_request,
+				       list);
+	list_del_init(&reg_request->list);
+
+	spin_unlock(&reg_requests_lock);
+
+	notify_self_managed_wiphys(reg_request);
+
+	reg_process_hint(reg_request);
+
+	lr = get_last_request();
+
+	spin_lock(&reg_requests_lock);
+	if (!list_empty(&reg_requests_list) && lr && lr->processed)
+		schedule_work(&reg_work);
+	spin_unlock(&reg_requests_lock);
+}
+
+/* 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;
+
+	/* This goes through the _pending_ beacon list */
+	spin_lock_bh(&reg_pending_beacons_lock);
+
+	list_for_each_entry_safe(pending_beacon, tmp,
+				 &reg_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, &reg_beacon_list);
+	}
+
+	spin_unlock_bh(&reg_pending_beacons_lock);
+}
+
+static void reg_process_self_managed_hints(void)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wiphy *wiphy;
+	const struct ieee80211_regdomain *tmp;
+	const struct ieee80211_regdomain *regd;
+	enum nl80211_band band;
+	struct regulatory_request request = {};
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		wiphy = &rdev->wiphy;
+
+		spin_lock(&reg_requests_lock);
+		regd = rdev->requested_regd;
+		rdev->requested_regd = NULL;
+		spin_unlock(&reg_requests_lock);
+
+		if (regd == NULL)
+			continue;
+
+		tmp = get_wiphy_regdom(wiphy);
+		rcu_assign_pointer(wiphy->regd, regd);
+		rcu_free_regdom(tmp);
+
+		for (band = 0; band < NUM_NL80211_BANDS; band++)
+			handle_band_custom(wiphy, wiphy->bands[band], regd);
+
+		reg_process_ht_flags(wiphy);
+
+		request.wiphy_idx = get_wiphy_idx(wiphy);
+		request.alpha2[0] = regd->alpha2[0];
+		request.alpha2[1] = regd->alpha2[1];
+		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
+
+		nl80211_send_wiphy_reg_change_event(&request);
+	}
+
+	reg_check_channels();
+}
+
+static void reg_todo(struct work_struct *work)
+{
+	rtnl_lock();
+	reg_process_pending_hints();
+	reg_process_pending_beacon_hints();
+	reg_process_self_managed_hints();
+	rtnl_unlock();
+}
+
+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(&reg_requests_lock);
+	list_add_tail(&request->list, &reg_requests_list);
+	spin_unlock(&reg_requests_lock);
+
+	schedule_work(&reg_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;
+	request->wiphy_idx = WIPHY_IDX_INVALID;
+
+	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;
+
+	if (!is_world_regdom(alpha2) && !is_an_alpha2(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;
+
+	/* Allow calling CRDA again */
+	reset_crda_timeouts();
+
+	queue_regulatory_request(request);
+
+	return 0;
+}
+
+int regulatory_hint_indoor(bool is_indoor, u32 portid)
+{
+	spin_lock(&reg_indoor_lock);
+
+	/* It is possible that more than one user space process is trying to
+	 * configure the indoor setting. To handle such cases, clear the indoor
+	 * setting in case that some process does not think that the device
+	 * is operating in an indoor environment. In addition, if a user space
+	 * process indicates that it is controlling the indoor setting, save its
+	 * portid, i.e., make it the owner.
+	 */
+	reg_is_indoor = is_indoor;
+	if (reg_is_indoor) {
+		if (!reg_is_indoor_portid)
+			reg_is_indoor_portid = portid;
+	} else {
+		reg_is_indoor_portid = 0;
+	}
+
+	spin_unlock(&reg_indoor_lock);
+
+	if (!is_indoor)
+		reg_check_channels();
+
+	return 0;
+}
+
+void regulatory_netlink_notify(u32 portid)
+{
+	spin_lock(&reg_indoor_lock);
+
+	if (reg_is_indoor_portid != portid) {
+		spin_unlock(&reg_indoor_lock);
+		return;
+	}
+
+	reg_is_indoor = false;
+	reg_is_indoor_portid = 0;
+
+	spin_unlock(&reg_indoor_lock);
+
+	reg_check_channels();
+}
+
+/* Driver hints */
+int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
+{
+	struct regulatory_request *request;
+
+	if (WARN_ON(!alpha2 || !wiphy))
+		return -EINVAL;
+
+	wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
+
+	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;
+
+	/* Allow calling CRDA again */
+	reset_crda_timeouts();
+
+	queue_regulatory_request(request);
+
+	return 0;
+}
+EXPORT_SYMBOL(regulatory_hint);
+
+void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
+				const u8 *country_ie, u8 country_ie_len)
+{
+	char alpha2[2];
+	enum environment_cap env = ENVIRON_ANY;
+	struct regulatory_request *request = NULL, *lr;
+
+	/* IE len must be evenly divisible by 2 */
+	if (country_ie_len & 0x01)
+		return;
+
+	if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
+		return;
+
+	request = kzalloc(sizeof(*request), GFP_KERNEL);
+	if (!request)
+		return;
+
+	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;
+
+	rcu_read_lock();
+	lr = get_last_request();
+
+	if (unlikely(!lr))
+		goto out;
+
+	/*
+	 * We will run this only upon a successful connection on cfg80211.
+	 * We leave conflict resolution to the workqueue, where can hold
+	 * the RTNL.
+	 */
+	if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+	    lr->wiphy_idx != WIPHY_IDX_INVALID)
+		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;
+
+	/* Allow calling CRDA again */
+	reset_crda_timeouts();
+
+	queue_regulatory_request(request);
+	request = NULL;
+out:
+	kfree(request);
+	rcu_read_unlock();
+}
+
+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) {
+			pr_debug("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)) {
+				pr_debug("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 {
+			pr_debug("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)) {
+		pr_debug("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
+		pr_debug("Restoring regulatory settings\n");
+}
+
+static void restore_custom_reg_settings(struct wiphy *wiphy)
+{
+	struct ieee80211_supported_band *sband;
+	enum nl80211_band band;
+	struct ieee80211_channel *chan;
+	int i;
+
+	for (band = 0; band < NUM_NL80211_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
+ * not need to be remembered.
+ */
+static void restore_regulatory_settings(bool reset_user, bool cached)
+{
+	char alpha2[2];
+	char world_alpha2[2];
+	struct reg_beacon *reg_beacon, *btmp;
+	LIST_HEAD(tmp_reg_req_list);
+	struct cfg80211_registered_device *rdev;
+
+	ASSERT_RTNL();
+
+	/*
+	 * Clear the indoor setting in case that it is not controlled by user
+	 * space, as otherwise there is no guarantee that the device is still
+	 * operating in an indoor environment.
+	 */
+	spin_lock(&reg_indoor_lock);
+	if (reg_is_indoor && !reg_is_indoor_portid) {
+		reg_is_indoor = false;
+		reg_check_channels();
+	}
+	spin_unlock(&reg_indoor_lock);
+
+	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(&reg_requests_lock);
+	list_splice_tail_init(&reg_requests_list, &tmp_reg_req_list);
+	spin_unlock(&reg_requests_lock);
+
+	/* Clear beacon hints */
+	spin_lock_bh(&reg_pending_beacons_lock);
+	list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
+		list_del(&reg_beacon->list);
+		kfree(reg_beacon);
+	}
+	spin_unlock_bh(&reg_pending_beacons_lock);
+
+	list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
+		list_del(&reg_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.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
+			continue;
+		if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
+			restore_custom_reg_settings(&rdev->wiphy);
+	}
+
+	if (cached && (!is_an_alpha2(alpha2) ||
+		       !IS_ERR_OR_NULL(cfg80211_user_regdom))) {
+		reset_regdomains(false, cfg80211_world_regdom);
+		update_all_wiphy_regulatory(NL80211_REGDOM_SET_BY_CORE);
+		print_regdomain(get_cfg80211_regdom());
+		nl80211_send_reg_change_event(&core_request_world);
+		reg_set_request_processed();
+
+		if (is_an_alpha2(alpha2) &&
+		    !regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER)) {
+			struct regulatory_request *ureq;
+
+			spin_lock(&reg_requests_lock);
+			ureq = list_last_entry(&reg_requests_list,
+					       struct regulatory_request,
+					       list);
+			list_del(&ureq->list);
+			spin_unlock(&reg_requests_lock);
+
+			notify_self_managed_wiphys(ureq);
+			reg_update_last_request(ureq);
+			set_regdom(reg_copy_regd(cfg80211_user_regdom),
+				   REGD_SOURCE_CACHED);
+		}
+	} else {
+		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(alpha2, NL80211_USER_REG_HINT_USER);
+	}
+
+	spin_lock(&reg_requests_lock);
+	list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
+	spin_unlock(&reg_requests_lock);
+
+	pr_debug("Kicking the queue\n");
+
+	schedule_work(&reg_work);
+}
+
+static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wireless_dev *wdev;
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
+			wdev_lock(wdev);
+			if (!(wdev->wiphy->regulatory_flags & flag)) {
+				wdev_unlock(wdev);
+				return false;
+			}
+			wdev_unlock(wdev);
+		}
+	}
+
+	return true;
+}
+
+void regulatory_hint_disconnect(void)
+{
+	/* Restore of regulatory settings is not required when wiphy(s)
+	 * ignore IE from connected access point but clearance of beacon hints
+	 * is required when wiphy(s) supports beacon hints.
+	 */
+	if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) {
+		struct reg_beacon *reg_beacon, *btmp;
+
+		if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS))
+			return;
+
+		spin_lock_bh(&reg_pending_beacons_lock);
+		list_for_each_entry_safe(reg_beacon, btmp,
+					 &reg_pending_beacons, list) {
+			list_del(&reg_beacon->list);
+			kfree(reg_beacon);
+		}
+		spin_unlock_bh(&reg_pending_beacons_lock);
+
+		list_for_each_entry_safe(reg_beacon, btmp,
+					 &reg_beacon_list, list) {
+			list_del(&reg_beacon->list);
+			kfree(reg_beacon);
+		}
+
+		return;
+	}
+
+	pr_debug("All devices are disconnected, going to restore regulatory settings\n");
+	restore_regulatory_settings(false, true);
+}
+
+static bool freq_is_chan_12_13_14(u32 freq)
+{
+	if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
+	    freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
+	    freq == ieee80211_channel_to_frequency(14, NL80211_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, &reg_pending_beacons, list)
+		if (ieee80211_channel_equal(beacon_chan,
+					    &pending_beacon->chan))
+			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 == NL80211_BAND_2GHZ &&
+	     !freq_is_chan_12_13_14(beacon_chan->center_freq)))
+		return 0;
+
+	spin_lock_bh(&reg_pending_beacons_lock);
+	processing = pending_reg_beacon(beacon_chan);
+	spin_unlock_bh(&reg_pending_beacons_lock);
+
+	if (processing)
+		return 0;
+
+	reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
+	if (!reg_beacon)
+		return -ENOMEM;
+
+	pr_debug("Found new beacon on frequency: %d.%03d MHz (Ch %d) on %s\n",
+		 beacon_chan->center_freq, beacon_chan->freq_offset,
+		 ieee80211_freq_khz_to_channel(
+			 ieee80211_channel_to_khz(beacon_chan)),
+		 wiphy_name(wiphy));
+
+	memcpy(&reg_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(&reg_pending_beacons_lock);
+	list_add_tail(&reg_beacon->list, &reg_pending_beacons);
+	spin_unlock_bh(&reg_pending_beacons_lock);
+
+	schedule_work(&reg_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;
+	char bw[32], cac_time[32];
+
+	pr_debug("  (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
+
+	for (i = 0; i < rd->n_reg_rules; i++) {
+		reg_rule = &rd->reg_rules[i];
+		freq_range = &reg_rule->freq_range;
+		power_rule = &reg_rule->power_rule;
+
+		if (reg_rule->flags & NL80211_RRF_AUTO_BW)
+			snprintf(bw, sizeof(bw), "%d KHz, %u KHz AUTO",
+				 freq_range->max_bandwidth_khz,
+				 reg_get_max_bandwidth(rd, reg_rule));
+		else
+			snprintf(bw, sizeof(bw), "%d KHz",
+				 freq_range->max_bandwidth_khz);
+
+		if (reg_rule->flags & NL80211_RRF_DFS)
+			scnprintf(cac_time, sizeof(cac_time), "%u s",
+				  reg_rule->dfs_cac_ms/1000);
+		else
+			scnprintf(cac_time, sizeof(cac_time), "N/A");
+
+
+		/*
+		 * There may not be documentation for max antenna gain
+		 * in certain regions
+		 */
+		if (power_rule->max_antenna_gain)
+			pr_debug("  (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
+				freq_range->start_freq_khz,
+				freq_range->end_freq_khz,
+				bw,
+				power_rule->max_antenna_gain,
+				power_rule->max_eirp,
+				cac_time);
+		else
+			pr_debug("  (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
+				freq_range->start_freq_khz,
+				freq_range->end_freq_khz,
+				bw,
+				power_rule->max_eirp,
+				cac_time);
+	}
+}
+
+bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
+{
+	switch (dfs_region) {
+	case NL80211_DFS_UNSET:
+	case NL80211_DFS_FCC:
+	case NL80211_DFS_ETSI:
+	case NL80211_DFS_JP:
+		return true;
+	default:
+		pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
+		return false;
+	}
+}
+
+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_debug("Current regulatory domain updated by AP to: %c%c\n",
+					rdev->country_ie_alpha2[0],
+					rdev->country_ie_alpha2[1]);
+			} else
+				pr_debug("Current regulatory domain intersected:\n");
+		} else
+			pr_debug("Current regulatory domain intersected:\n");
+	} else if (is_world_regdom(rd->alpha2)) {
+		pr_debug("World regulatory domain updated:\n");
+	} else {
+		if (is_unknown_alpha2(rd->alpha2))
+			pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
+		else {
+			if (reg_request_cell_base(lr))
+				pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
+					rd->alpha2[0], rd->alpha2[1]);
+			else
+				pr_debug("Regulatory domain changed to country: %c%c\n",
+					rd->alpha2[0], rd->alpha2[1]);
+		}
+	}
+
+	pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
+	print_rd_rules(rd);
+}
+
+static void print_regdomain_info(const struct ieee80211_regdomain *rd)
+{
+	pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
+	print_rd_rules(rd);
+}
+
+static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
+{
+	if (!is_world_regdom(rd->alpha2))
+		return -EINVAL;
+	update_world_regdomain(rd);
+	return 0;
+}
+
+static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
+			   struct regulatory_request *user_request)
+{
+	const struct ieee80211_regdomain *intersected_rd = NULL;
+
+	if (!regdom_changes(rd->alpha2))
+		return -EALREADY;
+
+	if (!is_valid_rd(rd)) {
+		pr_err("Invalid regulatory domain detected: %c%c\n",
+		       rd->alpha2[0], rd->alpha2[1]);
+		print_regdomain_info(rd);
+		return -EINVAL;
+	}
+
+	if (!user_request->intersect) {
+		reset_regdomains(false, rd);
+		return 0;
+	}
+
+	intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
+	if (!intersected_rd)
+		return -EINVAL;
+
+	kfree(rd);
+	rd = NULL;
+	reset_regdomains(false, intersected_rd);
+
+	return 0;
+}
+
+static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
+			     struct regulatory_request *driver_request)
+{
+	const struct ieee80211_regdomain *regd;
+	const struct ieee80211_regdomain *intersected_rd = NULL;
+	const struct ieee80211_regdomain *tmp;
+	struct wiphy *request_wiphy;
+
+	if (is_world_regdom(rd->alpha2))
+		return -EINVAL;
+
+	if (!regdom_changes(rd->alpha2))
+		return -EALREADY;
+
+	if (!is_valid_rd(rd)) {
+		pr_err("Invalid regulatory domain detected: %c%c\n",
+		       rd->alpha2[0], rd->alpha2[1]);
+		print_regdomain_info(rd);
+		return -EINVAL;
+	}
+
+	request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
+	if (!request_wiphy)
+		return -ENODEV;
+
+	if (!driver_request->intersect) {
+		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;
+	}
+
+	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
+	 */
+	tmp = get_wiphy_regdom(request_wiphy);
+	rcu_assign_pointer(request_wiphy->regd, rd);
+	rcu_free_regdom(tmp);
+
+	rd = NULL;
+
+	reset_regdomains(false, intersected_rd);
+
+	return 0;
+}
+
+static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
+				 struct regulatory_request *country_ie_request)
+{
+	struct wiphy *request_wiphy;
+
+	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 (!is_valid_rd(rd)) {
+		pr_err("Invalid regulatory domain detected: %c%c\n",
+		       rd->alpha2[0], rd->alpha2[1]);
+		print_regdomain_info(rd);
+		return -EINVAL;
+	}
+
+	request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
+	if (!request_wiphy)
+		return -ENODEV;
+
+	if (country_ie_request->intersect)
+		return -EINVAL;
+
+	reset_regdomains(false, rd);
+	return 0;
+}
+
+/*
+ * 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,
+	       enum ieee80211_regd_source regd_src)
+{
+	struct regulatory_request *lr;
+	bool user_reset = false;
+	int r;
+
+	if (IS_ERR_OR_NULL(rd))
+		return -ENODATA;
+
+	if (!reg_is_valid_request(rd->alpha2)) {
+		kfree(rd);
+		return -EINVAL;
+	}
+
+	if (regd_src == REGD_SOURCE_CRDA)
+		reset_crda_timeouts();
+
+	lr = get_last_request();
+
+	/* Note that this doesn't update the wiphys, this is done below */
+	switch (lr->initiator) {
+	case NL80211_REGDOM_SET_BY_CORE:
+		r = reg_set_rd_core(rd);
+		break;
+	case NL80211_REGDOM_SET_BY_USER:
+		cfg80211_save_user_regdom(rd);
+		r = reg_set_rd_user(rd, lr);
+		user_reset = true;
+		break;
+	case NL80211_REGDOM_SET_BY_DRIVER:
+		r = reg_set_rd_driver(rd, lr);
+		break;
+	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+		r = reg_set_rd_country_ie(rd, lr);
+		break;
+	default:
+		WARN(1, "invalid initiator %d\n", lr->initiator);
+		kfree(rd);
+		return -EINVAL;
+	}
+
+	if (r) {
+		switch (r) {
+		case -EALREADY:
+			reg_set_request_processed();
+			break;
+		default:
+			/* Back to world regulatory in case of errors */
+			restore_regulatory_settings(user_reset, false);
+		}
+
+		kfree(rd);
+		return r;
+	}
+
+	/* This would make this whole thing pointless */
+	if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
+		return -EINVAL;
+
+	/* 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();
+
+	return 0;
+}
+
+static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
+				       struct ieee80211_regdomain *rd)
+{
+	const struct ieee80211_regdomain *regd;
+	const struct ieee80211_regdomain *prev_regd;
+	struct cfg80211_registered_device *rdev;
+
+	if (WARN_ON(!wiphy || !rd))
+		return -EINVAL;
+
+	if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
+		 "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
+		return -EPERM;
+
+	if (WARN(!is_valid_rd(rd), "Invalid regulatory domain detected\n")) {
+		print_regdomain_info(rd);
+		return -EINVAL;
+	}
+
+	regd = reg_copy_regd(rd);
+	if (IS_ERR(regd))
+		return PTR_ERR(regd);
+
+	rdev = wiphy_to_rdev(wiphy);
+
+	spin_lock(&reg_requests_lock);
+	prev_regd = rdev->requested_regd;
+	rdev->requested_regd = regd;
+	spin_unlock(&reg_requests_lock);
+
+	kfree(prev_regd);
+	return 0;
+}
+
+int regulatory_set_wiphy_regd(struct wiphy *wiphy,
+			      struct ieee80211_regdomain *rd)
+{
+	int ret = __regulatory_set_wiphy_regd(wiphy, rd);
+
+	if (ret)
+		return ret;
+
+	schedule_work(&reg_work);
+	return 0;
+}
+EXPORT_SYMBOL(regulatory_set_wiphy_regd);
+
+int regulatory_set_wiphy_regd_sync_rtnl(struct wiphy *wiphy,
+					struct ieee80211_regdomain *rd)
+{
+	int ret;
+
+	ASSERT_RTNL();
+
+	ret = __regulatory_set_wiphy_regd(wiphy, rd);
+	if (ret)
+		return ret;
+
+	/* process the request immediately */
+	reg_process_self_managed_hints();
+	return 0;
+}
+EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync_rtnl);
+
+void wiphy_regulatory_register(struct wiphy *wiphy)
+{
+	struct regulatory_request *lr = get_last_request();
+
+	/* self-managed devices ignore beacon hints and country IE */
+	if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
+		wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
+					   REGULATORY_COUNTRY_IE_IGNORE;
+
+		/*
+		 * The last request may have been received before this
+		 * registration call. Call the driver notifier if
+		 * initiator is USER.
+		 */
+		if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
+			reg_call_notifier(wiphy, lr);
+	}
+
+	if (!reg_dev_ignore_cell_hint(wiphy))
+		reg_num_devs_support_basehint++;
+
+	wiphy_update_regulatory(wiphy, lr->initiator);
+	wiphy_all_share_dfs_chan_state(wiphy);
+	reg_process_self_managed_hints();
+}
+
+void wiphy_regulatory_deregister(struct wiphy *wiphy)
+{
+	struct wiphy *request_wiphy = NULL;
+	struct regulatory_request *lr;
+
+	lr = get_last_request();
+
+	if (!reg_dev_ignore_cell_hint(wiphy))
+		reg_num_devs_support_basehint--;
+
+	rcu_free_regdom(get_wiphy_regdom(wiphy));
+	RCU_INIT_POINTER(wiphy->regd, NULL);
+
+	if (lr)
+		request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
+
+	if (!request_wiphy || request_wiphy != wiphy)
+		return;
+
+	lr->wiphy_idx = WIPHY_IDX_INVALID;
+	lr->country_ie_env = ENVIRON_ANY;
+}
+
+/*
+ * See FCC notices for UNII band definitions
+ *  5GHz: https://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii
+ *  6GHz: https://www.fcc.gov/document/fcc-proposes-more-spectrum-unlicensed-use-0
+ */
+int cfg80211_get_unii(int freq)
+{
+	/* UNII-1 */
+	if (freq >= 5150 && freq <= 5250)
+		return 0;
+
+	/* UNII-2A */
+	if (freq > 5250 && freq <= 5350)
+		return 1;
+
+	/* UNII-2B */
+	if (freq > 5350 && freq <= 5470)
+		return 2;
+
+	/* UNII-2C */
+	if (freq > 5470 && freq <= 5725)
+		return 3;
+
+	/* UNII-3 */
+	if (freq > 5725 && freq <= 5825)
+		return 4;
+
+	/* UNII-5 */
+	if (freq > 5925 && freq <= 6425)
+		return 5;
+
+	/* UNII-6 */
+	if (freq > 6425 && freq <= 6525)
+		return 6;
+
+	/* UNII-7 */
+	if (freq > 6525 && freq <= 6875)
+		return 7;
+
+	/* UNII-8 */
+	if (freq > 6875 && freq <= 7125)
+		return 8;
+
+	return -EINVAL;
+}
+
+bool regulatory_indoor_allowed(void)
+{
+	return reg_is_indoor;
+}
+
+bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
+{
+	const struct ieee80211_regdomain *regd = NULL;
+	const struct ieee80211_regdomain *wiphy_regd = NULL;
+	bool pre_cac_allowed = false;
+
+	rcu_read_lock();
+
+	regd = rcu_dereference(cfg80211_regdomain);
+	wiphy_regd = rcu_dereference(wiphy->regd);
+	if (!wiphy_regd) {
+		if (regd->dfs_region == NL80211_DFS_ETSI)
+			pre_cac_allowed = true;
+
+		rcu_read_unlock();
+
+		return pre_cac_allowed;
+	}
+
+	if (regd->dfs_region == wiphy_regd->dfs_region &&
+	    wiphy_regd->dfs_region == NL80211_DFS_ETSI)
+		pre_cac_allowed = true;
+
+	rcu_read_unlock();
+
+	return pre_cac_allowed;
+}
+EXPORT_SYMBOL(regulatory_pre_cac_allowed);
+
+static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev)
+{
+	struct wireless_dev *wdev;
+	/* If we finished CAC or received radar, we should end any
+	 * CAC running on the same channels.
+	 * the check !cfg80211_chandef_dfs_usable contain 2 options:
+	 * either all channels are available - those the CAC_FINISHED
+	 * event has effected another wdev state, or there is a channel
+	 * in unavailable state in wdev chandef - those the RADAR_DETECTED
+	 * event has effected another wdev state.
+	 * In both cases we should end the CAC on the wdev.
+	 */
+	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
+		if (wdev->cac_started &&
+		    !cfg80211_chandef_dfs_usable(&rdev->wiphy, &wdev->chandef))
+			rdev_end_cac(rdev, wdev->netdev);
+	}
+}
+
+void regulatory_propagate_dfs_state(struct wiphy *wiphy,
+				    struct cfg80211_chan_def *chandef,
+				    enum nl80211_dfs_state dfs_state,
+				    enum nl80211_radar_event event)
+{
+	struct cfg80211_registered_device *rdev;
+
+	ASSERT_RTNL();
+
+	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+		return;
+
+	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+		if (wiphy == &rdev->wiphy)
+			continue;
+
+		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
+			continue;
+
+		if (!ieee80211_get_channel(&rdev->wiphy,
+					   chandef->chan->center_freq))
+			continue;
+
+		cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
+
+		if (event == NL80211_RADAR_DETECTED ||
+		    event == NL80211_RADAR_CAC_FINISHED) {
+			cfg80211_sched_dfs_chan_update(rdev);
+			cfg80211_check_and_end_cac(rdev);
+		}
+
+		nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
+	}
+}
+
+static int __init regulatory_init_db(void)
+{
+	int err;
+
+	/*
+	 * It's possible that - due to other bugs/issues - cfg80211
+	 * never called regulatory_init() below, or that it failed;
+	 * in that case, don't try to do any further work here as
+	 * it's doomed to lead to crashes.
+	 */
+	if (IS_ERR_OR_NULL(reg_pdev))
+		return -EINVAL;
+
+	err = load_builtin_regdb_keys();
+	if (err) {
+		platform_device_unregister(reg_pdev);
+		return err;
+	}
+
+	/* We always try to get an update for the static regdomain */
+	err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
+	if (err) {
+		if (err == -ENOMEM) {
+			platform_device_unregister(reg_pdev);
+			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;
+}
+#ifndef MODULE
+late_initcall(regulatory_init_db);
+#endif
+
+int __init regulatory_init(void)
+{
+	reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
+	if (IS_ERR(reg_pdev))
+		return PTR_ERR(reg_pdev);
+
+	spin_lock_init(&reg_requests_lock);
+	spin_lock_init(&reg_pending_beacons_lock);
+	spin_lock_init(&reg_indoor_lock);
+
+	rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
+
+	user_alpha2[0] = '9';
+	user_alpha2[1] = '7';
+
+#ifdef MODULE
+	return regulatory_init_db();
+#else
+	return 0;
+#endif
+}
+
+void regulatory_exit(void)
+{
+	struct regulatory_request *reg_request, *tmp;
+	struct reg_beacon *reg_beacon, *btmp;
+
+	cancel_work_sync(&reg_work);
+	cancel_crda_timeout_sync();
+	cancel_delayed_work_sync(&reg_check_chans);
+
+	/* Lock to suppress warnings */
+	rtnl_lock();
+	reset_regdomains(true, NULL);
+	rtnl_unlock();
+
+	dev_set_uevent_suppress(&reg_pdev->dev, true);
+
+	platform_device_unregister(reg_pdev);
+
+	list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
+		list_del(&reg_beacon->list);
+		kfree(reg_beacon);
+	}
+
+	list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
+		list_del(&reg_beacon->list);
+		kfree(reg_beacon);
+	}
+
+	list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
+		list_del(&reg_request->list);
+		kfree(reg_request);
+	}
+
+	if (!IS_ERR_OR_NULL(regdb))
+		kfree(regdb);
+	if (!IS_ERR_OR_NULL(cfg80211_user_regdom))
+		kfree(cfg80211_user_regdom);
+
+	free_regdb_keyring();
+}