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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /net/wireless/reg.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'net/wireless/reg.c')
-rw-r--r--net/wireless/reg.c2421
1 files changed, 2421 insertions, 0 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
new file mode 100644
index 00000000000..f65feaad155
--- /dev/null
+++ b/net/wireless/reg.c
@@ -0,0 +1,2421 @@
+/*
+ * 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>
+ *
+ * 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/random.h>
+#include <linux/ctype.h>
+#include <linux/nl80211.h>
+#include <linux/platform_device.h>
+#include <linux/moduleparam.h>
+#include <net/cfg80211.h>
+#include "core.h"
+#include "reg.h"
+#include "regdb.h"
+#include "nl80211.h"
+
+#ifdef CONFIG_CFG80211_REG_DEBUG
+#define REG_DBG_PRINT(format, args...) \
+ printk(KERN_DEBUG pr_fmt(format), ##args)
+#else
+#define REG_DBG_PRINT(args...)
+#endif
+
+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 */
+static struct regulatory_request *last_request = &core_request_world;
+
+/* To trigger userspace events */
+static struct platform_device *reg_pdev;
+
+static struct device_type reg_device_type = {
+ .uevent = reg_device_uevent,
+};
+
+/*
+ * 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
+ */
+const struct ieee80211_regdomain *cfg80211_regdomain;
+
+/*
+ * Protects static reg.c components:
+ * - cfg80211_world_regdom
+ * - cfg80211_regdom
+ * - last_request
+ */
+static DEFINE_MUTEX(reg_mutex);
+
+static inline void assert_reg_lock(void)
+{
+ lockdep_assert_held(&reg_mutex);
+}
+
+/* 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_todo(struct work_struct *work);
+static DECLARE_WORK(reg_work, reg_todo);
+
+static void reg_timeout_work(struct work_struct *work);
+static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);
+
+/* We keep a static world regulatory domain in case of the absence of CRDA */
+static const struct ieee80211_regdomain world_regdom = {
+ .n_reg_rules = 5,
+ .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. No HT40
+ * channel fits here. */
+ REG_RULE(2467-10, 2472+10, 20, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS),
+ /* 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_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS |
+ NL80211_RRF_NO_OFDM),
+ /* IEEE 802.11a, channel 36..48 */
+ REG_RULE(5180-10, 5240+10, 40, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS),
+
+ /* NB: 5260 MHz - 5700 MHz requies DFS */
+
+ /* IEEE 802.11a, channel 149..165 */
+ REG_RULE(5745-10, 5825+10, 40, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS),
+ }
+};
+
+static const struct ieee80211_regdomain *cfg80211_world_regdom =
+ &world_regdom;
+
+static char *ieee80211_regdom = "00";
+static char user_alpha2[2];
+
+module_param(ieee80211_regdom, charp, 0444);
+MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
+
+static void reset_regdomains(bool full_reset)
+{
+ /* avoid freeing static information or freeing something twice */
+ if (cfg80211_regdomain == cfg80211_world_regdom)
+ cfg80211_regdomain = NULL;
+ if (cfg80211_world_regdom == &world_regdom)
+ cfg80211_world_regdom = NULL;
+ if (cfg80211_regdomain == &world_regdom)
+ cfg80211_regdomain = NULL;
+
+ kfree(cfg80211_regdomain);
+ kfree(cfg80211_world_regdom);
+
+ cfg80211_world_regdom = &world_regdom;
+ cfg80211_regdomain = NULL;
+
+ if (!full_reset)
+ return;
+
+ if (last_request != &core_request_world)
+ kfree(last_request);
+ 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)
+{
+ BUG_ON(!last_request);
+
+ reset_regdomains(false);
+
+ cfg80211_world_regdom = rd;
+ cfg80211_regdomain = rd;
+}
+
+bool is_world_regdom(const char *alpha2)
+{
+ if (!alpha2)
+ return false;
+ if (alpha2[0] == '0' && alpha2[1] == '0')
+ return true;
+ return false;
+}
+
+static bool is_alpha2_set(const char *alpha2)
+{
+ if (!alpha2)
+ return false;
+ if (alpha2[0] != 0 && alpha2[1] != 0)
+ return true;
+ return false;
+}
+
+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
+ */
+ if (alpha2[0] == '9' && alpha2[1] == '9')
+ return true;
+ return false;
+}
+
+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
+ */
+ if (alpha2[0] == '9' && alpha2[1] == '8')
+ return true;
+ return false;
+}
+
+static bool is_an_alpha2(const char *alpha2)
+{
+ if (!alpha2)
+ return false;
+ if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
+ return true;
+ return false;
+}
+
+static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
+{
+ if (!alpha2_x || !alpha2_y)
+ return false;
+ if (alpha2_x[0] == alpha2_y[0] &&
+ alpha2_x[1] == alpha2_y[1])
+ return true;
+ return false;
+}
+
+static bool regdom_changes(const char *alpha2)
+{
+ assert_cfg80211_lock();
+
+ if (!cfg80211_regdomain)
+ return true;
+ if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ return false;
+ return true;
+}
+
+/*
+ * 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 int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
+ const struct ieee80211_regdomain *src_regd)
+{
+ struct ieee80211_regdomain *regd;
+ int size_of_regd = 0;
+ unsigned int i;
+
+ size_of_regd = sizeof(struct ieee80211_regdomain) +
+ ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
+
+ regd = kzalloc(size_of_regd, GFP_KERNEL);
+ if (!regd)
+ return -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));
+
+ *dst_regd = regd;
+ return 0;
+}
+
+#ifdef CONFIG_CFG80211_INTERNAL_REGDB
+struct reg_regdb_search_request {
+ char alpha2[2];
+ struct list_head list;
+};
+
+static LIST_HEAD(reg_regdb_search_list);
+static DEFINE_MUTEX(reg_regdb_search_mutex);
+
+static void reg_regdb_search(struct work_struct *work)
+{
+ struct reg_regdb_search_request *request;
+ const struct ieee80211_regdomain *curdom, *regdom;
+ int i, r;
+
+ mutex_lock(&reg_regdb_search_mutex);
+ while (!list_empty(&reg_regdb_search_list)) {
+ request = list_first_entry(&reg_regdb_search_list,
+ struct reg_regdb_search_request,
+ list);
+ list_del(&request->list);
+
+ for (i=0; i<reg_regdb_size; i++) {
+ curdom = reg_regdb[i];
+
+ if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
+ r = reg_copy_regd(&regdom, curdom);
+ if (r)
+ break;
+ mutex_lock(&cfg80211_mutex);
+ set_regdom(regdom);
+ mutex_unlock(&cfg80211_mutex);
+ break;
+ }
+ }
+
+ kfree(request);
+ }
+ mutex_unlock(&reg_regdb_search_mutex);
+}
+
+static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
+
+static void reg_regdb_query(const char *alpha2)
+{
+ struct reg_regdb_search_request *request;
+
+ if (!alpha2)
+ return;
+
+ request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
+ if (!request)
+ return;
+
+ memcpy(request->alpha2, alpha2, 2);
+
+ mutex_lock(&reg_regdb_search_mutex);
+ list_add_tail(&request->list, &reg_regdb_search_list);
+ mutex_unlock(&reg_regdb_search_mutex);
+
+ schedule_work(&reg_regdb_work);
+}
+#else
+static inline void reg_regdb_query(const char *alpha2) {}
+#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
+
+/*
+ * This lets us keep regulatory code which is updated on a regulatory
+ * basis in userspace. Country information is filled in by
+ * reg_device_uevent
+ */
+static int call_crda(const char *alpha2)
+{
+ if (!is_world_regdom((char *) alpha2))
+ pr_info("Calling CRDA for country: %c%c\n",
+ alpha2[0], alpha2[1]);
+ else
+ pr_info("Calling CRDA to update world regulatory domain\n");
+
+ /* query internal regulatory database (if it exists) */
+ reg_regdb_query(alpha2);
+
+ return kobject_uevent(&reg_pdev->dev.kobj, KOBJ_CHANGE);
+}
+
+/* Used by nl80211 before kmalloc'ing our regulatory domain */
+bool reg_is_valid_request(const char *alpha2)
+{
+ assert_cfg80211_lock();
+
+ if (!last_request)
+ return false;
+
+ return alpha2_equal(last_request->alpha2, alpha2);
+}
+
+/* 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;
+}
+
+static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
+ u32 center_freq_khz,
+ u32 bw_khz)
+{
+ u32 start_freq_khz, end_freq_khz;
+
+ start_freq_khz = center_freq_khz - (bw_khz/2);
+ end_freq_khz = center_freq_khz + (bw_khz/2);
+
+ if (start_freq_khz >= freq_range->start_freq_khz &&
+ end_freq_khz <= freq_range->end_freq_khz)
+ return true;
+
+ return false;
+}
+
+/**
+ * freq_in_rule_band - tells us if a frequency is in a frequency band
+ * @freq_range: frequency rule we want to query
+ * @freq_khz: frequency we are inquiring about
+ *
+ * This lets us know if a specific frequency rule is or is not relevant to
+ * a specific frequency's band. Bands are device specific and artificial
+ * definitions (the "2.4 GHz band" and the "5 GHz 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.
+ * 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
+ if (abs(freq_khz - freq_range->start_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
+ return true;
+ if (abs(freq_khz - freq_range->end_freq_khz) <= (2 * ONE_GHZ_IN_KHZ))
+ return true;
+ return false;
+#undef ONE_GHZ_IN_KHZ
+}
+
+/*
+ * Helper for regdom_intersect(), this does the real
+ * mathematical intersection fun
+ */
+static int reg_rules_intersect(
+ const struct ieee80211_reg_rule *rule1,
+ const struct ieee80211_reg_rule *rule2,
+ struct ieee80211_reg_rule *intersected_rule)
+{
+ const struct ieee80211_freq_range *freq_range1, *freq_range2;
+ struct ieee80211_freq_range *freq_range;
+ const struct ieee80211_power_rule *power_rule1, *power_rule2;
+ struct ieee80211_power_rule *power_rule;
+ u32 freq_diff;
+
+ freq_range1 = &rule1->freq_range;
+ freq_range2 = &rule2->freq_range;
+ freq_range = &intersected_rule->freq_range;
+
+ power_rule1 = &rule1->power_rule;
+ power_rule2 = &rule2->power_rule;
+ power_rule = &intersected_rule->power_rule;
+
+ freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
+ freq_range2->start_freq_khz);
+ freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
+ freq_range2->end_freq_khz);
+ freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz,
+ freq_range2->max_bandwidth_khz);
+
+ freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
+ if (freq_range->max_bandwidth_khz > freq_diff)
+ freq_range->max_bandwidth_khz = freq_diff;
+
+ power_rule->max_eirp = min(power_rule1->max_eirp,
+ power_rule2->max_eirp);
+ power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
+ power_rule2->max_antenna_gain);
+
+ intersected_rule->flags = (rule1->flags | rule2->flags);
+
+ if (!is_valid_reg_rule(intersected_rule))
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * regdom_intersect - do the intersection between two regulatory domains
+ * @rd1: first regulatory domain
+ * @rd2: second regulatory domain
+ *
+ * Use this function to get the intersection between two regulatory domains.
+ * Once completed we will mark the alpha2 for the rd as intersected, "98",
+ * as no one single alpha2 can represent this regulatory domain.
+ *
+ * Returns a pointer to the regulatory domain structure which will hold the
+ * resulting intersection of rules between rd1 and rd2. We will
+ * kzalloc() this structure for you.
+ */
+static struct ieee80211_regdomain *regdom_intersect(
+ const struct ieee80211_regdomain *rd1,
+ const struct ieee80211_regdomain *rd2)
+{
+ int r, size_of_regd;
+ unsigned int x, y;
+ unsigned int num_rules = 0, rule_idx = 0;
+ const struct ieee80211_reg_rule *rule1, *rule2;
+ struct ieee80211_reg_rule *intersected_rule;
+ struct ieee80211_regdomain *rd;
+ /* This is just a dummy holder to help us count */
+ struct ieee80211_reg_rule irule;
+
+ /* Uses the stack temporarily for counter arithmetic */
+ intersected_rule = &irule;
+
+ memset(intersected_rule, 0, sizeof(struct ieee80211_reg_rule));
+
+ if (!rd1 || !rd2)
+ return NULL;
+
+ /*
+ * First we get a count of the rules we'll need, then we actually
+ * build them. This is to so we can malloc() and free() a
+ * regdomain once. The reason we use reg_rules_intersect() here
+ * is it will return -EINVAL if the rule computed makes no sense.
+ * All rules that do check out OK are valid.
+ */
+
+ for (x = 0; x < rd1->n_reg_rules; x++) {
+ rule1 = &rd1->reg_rules[x];
+ for (y = 0; y < rd2->n_reg_rules; y++) {
+ rule2 = &rd2->reg_rules[y];
+ if (!reg_rules_intersect(rule1, rule2,
+ intersected_rule))
+ num_rules++;
+ memset(intersected_rule, 0,
+ sizeof(struct ieee80211_reg_rule));
+ }
+ }
+
+ if (!num_rules)
+ return NULL;
+
+ size_of_regd = sizeof(struct ieee80211_regdomain) +
+ ((num_rules + 1) * sizeof(struct ieee80211_reg_rule));
+
+ rd = kzalloc(size_of_regd, 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];
+ /*
+ * This time around instead of using the stack lets
+ * write to the target rule directly saving ourselves
+ * a memcpy()
+ */
+ intersected_rule = &rd->reg_rules[rule_idx];
+ r = reg_rules_intersect(rule1, rule2,
+ intersected_rule);
+ /*
+ * No need to memset here the intersected rule here as
+ * we're not using the stack anymore
+ */
+ if (r)
+ continue;
+ rule_idx++;
+ }
+ }
+
+ if (rule_idx != num_rules) {
+ kfree(rd);
+ return NULL;
+ }
+
+ rd->n_reg_rules = num_rules;
+ rd->alpha2[0] = '9';
+ rd->alpha2[1] = '8';
+
+ return rd;
+}
+
+/*
+ * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
+ * want to just have the channel structure use these
+ */
+static u32 map_regdom_flags(u32 rd_flags)
+{
+ u32 channel_flags = 0;
+ if (rd_flags & NL80211_RRF_PASSIVE_SCAN)
+ channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN;
+ if (rd_flags & NL80211_RRF_NO_IBSS)
+ channel_flags |= IEEE80211_CHAN_NO_IBSS;
+ if (rd_flags & NL80211_RRF_DFS)
+ channel_flags |= IEEE80211_CHAN_RADAR;
+ return channel_flags;
+}
+
+static int freq_reg_info_regd(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 desired_bw_khz,
+ const struct ieee80211_reg_rule **reg_rule,
+ const struct ieee80211_regdomain *custom_regd)
+{
+ int i;
+ bool band_rule_found = false;
+ const struct ieee80211_regdomain *regd;
+ bool bw_fits = false;
+
+ if (!desired_bw_khz)
+ desired_bw_khz = MHZ_TO_KHZ(20);
+
+ regd = custom_regd ? custom_regd : cfg80211_regdomain;
+
+ /*
+ * Follow the driver's regulatory domain, if present, unless a country
+ * IE has been processed or a user wants to help complaince further
+ */
+ if (!custom_regd &&
+ last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
+ wiphy->regd)
+ regd = wiphy->regd;
+
+ if (!regd)
+ return -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
+ * was in center_freq's band, that's enough, so lets
+ * not overwrite it once found
+ */
+ if (!band_rule_found)
+ band_rule_found = freq_in_rule_band(fr, center_freq);
+
+ bw_fits = reg_does_bw_fit(fr,
+ center_freq,
+ desired_bw_khz);
+
+ if (band_rule_found && bw_fits) {
+ *reg_rule = rr;
+ return 0;
+ }
+ }
+
+ if (!band_rule_found)
+ return -ERANGE;
+
+ return -EINVAL;
+}
+
+int freq_reg_info(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 desired_bw_khz,
+ const struct ieee80211_reg_rule **reg_rule)
+{
+ assert_cfg80211_lock();
+ return freq_reg_info_regd(wiphy,
+ center_freq,
+ desired_bw_khz,
+ reg_rule,
+ NULL);
+}
+EXPORT_SYMBOL(freq_reg_info);
+
+#ifdef CONFIG_CFG80211_REG_DEBUG
+static const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
+{
+ switch (initiator) {
+ case NL80211_REGDOM_SET_BY_CORE:
+ return "Set by core";
+ case NL80211_REGDOM_SET_BY_USER:
+ return "Set by user";
+ case NL80211_REGDOM_SET_BY_DRIVER:
+ return "Set by driver";
+ case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+ return "Set by country IE";
+ default:
+ WARN_ON(1);
+ return "Set by bug";
+ }
+}
+
+static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
+ u32 desired_bw_khz,
+ const struct ieee80211_reg_rule *reg_rule)
+{
+ const struct ieee80211_power_rule *power_rule;
+ const struct ieee80211_freq_range *freq_range;
+ char max_antenna_gain[32];
+
+ power_rule = &reg_rule->power_rule;
+ freq_range = &reg_rule->freq_range;
+
+ if (!power_rule->max_antenna_gain)
+ snprintf(max_antenna_gain, 32, "N/A");
+ else
+ snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain);
+
+ REG_DBG_PRINT("Updating information on frequency %d MHz "
+ "for a %d MHz width channel with regulatory rule:\n",
+ chan->center_freq,
+ KHZ_TO_MHZ(desired_bw_khz));
+
+ REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n",
+ freq_range->start_freq_khz,
+ freq_range->end_freq_khz,
+ freq_range->max_bandwidth_khz,
+ max_antenna_gain,
+ power_rule->max_eirp);
+}
+#else
+static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan,
+ u32 desired_bw_khz,
+ const struct ieee80211_reg_rule *reg_rule)
+{
+ return;
+}
+#endif
+
+/*
+ * Note that right now we assume the desired channel bandwidth
+ * is always 20 MHz for each individual channel (HT40 uses 20 MHz
+ * per channel, the primary and the extension channel). To support
+ * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
+ * new ieee80211_channel.target_bw and re run the regulatory check
+ * on the wiphy with the target_bw specified. Then we can simply use
+ * that below for the desired_bw_khz below.
+ */
+static void handle_channel(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator,
+ enum ieee80211_band band,
+ unsigned int chan_idx)
+{
+ int r;
+ u32 flags, bw_flags = 0;
+ u32 desired_bw_khz = MHZ_TO_KHZ(20);
+ const struct ieee80211_reg_rule *reg_rule = NULL;
+ const struct ieee80211_power_rule *power_rule = NULL;
+ const struct ieee80211_freq_range *freq_range = NULL;
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *chan;
+ struct wiphy *request_wiphy = NULL;
+
+ assert_cfg80211_lock();
+
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
+ sband = wiphy->bands[band];
+ BUG_ON(chan_idx >= sband->n_channels);
+ chan = &sband->channels[chan_idx];
+
+ flags = chan->orig_flags;
+
+ r = freq_reg_info(wiphy,
+ MHZ_TO_KHZ(chan->center_freq),
+ desired_bw_khz,
+ &reg_rule);
+
+ if (r) {
+ /*
+ * 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 &&
+ r == -ERANGE)
+ return;
+
+ REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq);
+ chan->flags = IEEE80211_CHAN_DISABLED;
+ return;
+ }
+
+ chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
+
+ power_rule = &reg_rule->power_rule;
+ freq_range = &reg_rule->freq_range;
+
+ if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
+ bw_flags = IEEE80211_CHAN_NO_HT40;
+
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+ request_wiphy && request_wiphy == wiphy &&
+ request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
+ /*
+ * This guarantees the driver's requested regulatory domain
+ * will always be used as a base for further regulatory
+ * settings
+ */
+ chan->flags = chan->orig_flags =
+ map_regdom_flags(reg_rule->flags) | bw_flags;
+ chan->max_antenna_gain = chan->orig_mag =
+ (int) MBI_TO_DBI(power_rule->max_antenna_gain);
+ chan->max_power = chan->orig_mpwr =
+ (int) MBM_TO_DBM(power_rule->max_eirp);
+ return;
+ }
+
+ chan->beacon_found = false;
+ chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
+ chan->max_antenna_gain = min(chan->orig_mag,
+ (int) MBI_TO_DBI(power_rule->max_antenna_gain));
+ if (chan->orig_mpwr) {
+ /*
+ * Devices that have their own custom regulatory domain
+ * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the
+ * passed country IE power settings.
+ */
+ if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
+ wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
+ chan->max_power =
+ MBM_TO_DBM(power_rule->max_eirp);
+ } else {
+ chan->max_power = min(chan->orig_mpwr,
+ (int) MBM_TO_DBM(power_rule->max_eirp));
+ }
+ } else
+ chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
+}
+
+static void handle_band(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ enum nl80211_reg_initiator initiator)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ BUG_ON(!wiphy->bands[band]);
+ sband = wiphy->bands[band];
+
+ for (i = 0; i < sband->n_channels; i++)
+ handle_channel(wiphy, initiator, band, i);
+}
+
+static bool ignore_reg_update(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
+{
+ if (!last_request) {
+ REG_DBG_PRINT("Ignoring regulatory request %s since "
+ "last_request is not set\n",
+ reg_initiator_name(initiator));
+ return true;
+ }
+
+ if (initiator == NL80211_REGDOM_SET_BY_CORE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) {
+ REG_DBG_PRINT("Ignoring regulatory request %s "
+ "since the driver uses its own custom "
+ "regulatory domain\n",
+ reg_initiator_name(initiator));
+ return true;
+ }
+
+ /*
+ * wiphy->regd will be set once the device has its own
+ * desired regulatory domain set
+ */
+ if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
+ initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ !is_world_regdom(last_request->alpha2)) {
+ REG_DBG_PRINT("Ignoring regulatory request %s "
+ "since the driver requires its own regulatory "
+ "domain to be set first\n",
+ reg_initiator_name(initiator));
+ return true;
+ }
+
+ 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;
+
+ assert_cfg80211_lock();
+
+ sband = wiphy->bands[reg_beacon->chan.band];
+ chan = &sband->channels[chan_idx];
+
+ if (likely(chan->center_freq != reg_beacon->chan.center_freq))
+ return;
+
+ if (chan->beacon_found)
+ return;
+
+ chan->beacon_found = true;
+
+ if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
+ return;
+
+ chan_before.center_freq = chan->center_freq;
+ chan_before.flags = chan->flags;
+
+ if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
+ chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+ channel_changed = true;
+ }
+
+ if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
+ chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
+ channel_changed = true;
+ }
+
+ if (channel_changed)
+ nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
+}
+
+/*
+ * Called when a scan on a wiphy finds a beacon on
+ * new channel
+ */
+static void wiphy_update_new_beacon(struct wiphy *wiphy,
+ struct reg_beacon *reg_beacon)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ assert_cfg80211_lock();
+
+ 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;
+
+ assert_cfg80211_lock();
+
+ if (list_empty(&reg_beacon_list))
+ return;
+
+ 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);
+ }
+}
+
+static bool reg_is_world_roaming(struct wiphy *wiphy)
+{
+ if (is_world_regdom(cfg80211_regdomain->alpha2) ||
+ (wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
+ return true;
+ if (last_request &&
+ last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
+ return true;
+ return false;
+}
+
+/* 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;
+ if (!reg_is_world_roaming(wiphy))
+ return;
+ wiphy_update_beacon_reg(wiphy);
+}
+
+static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
+{
+ if (!chan)
+ return true;
+ if (chan->flags & IEEE80211_CHAN_DISABLED)
+ return true;
+ /* This would happen when regulatory rules disallow HT40 completely */
+ if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
+ return true;
+ return false;
+}
+
+static void reg_process_ht_flags_channel(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ unsigned int chan_idx)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *channel;
+ struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
+ unsigned int i;
+
+ assert_cfg80211_lock();
+
+ sband = wiphy->bands[band];
+ BUG_ON(chan_idx >= sband->n_channels);
+ channel = &sband->channels[chan_idx];
+
+ if (is_ht40_not_allowed(channel)) {
+ channel->flags |= IEEE80211_CHAN_NO_HT40;
+ return;
+ }
+
+ /*
+ * We need to ensure the extension channels exist to
+ * be able to use HT40- or HT40+, this finds them (or not)
+ */
+ for (i = 0; i < sband->n_channels; i++) {
+ struct ieee80211_channel *c = &sband->channels[i];
+ if (c->center_freq == (channel->center_freq - 20))
+ channel_before = c;
+ if (c->center_freq == (channel->center_freq + 20))
+ channel_after = c;
+ }
+
+ /*
+ * Please note that this assumes target bandwidth is 20 MHz,
+ * if that ever changes we also need to change the below logic
+ * to include that as well.
+ */
+ if (is_ht40_not_allowed(channel_before))
+ channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
+
+ if (is_ht40_not_allowed(channel_after))
+ channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
+}
+
+static void reg_process_ht_flags_band(struct wiphy *wiphy,
+ enum ieee80211_band band)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ BUG_ON(!wiphy->bands[band]);
+ sband = wiphy->bands[band];
+
+ for (i = 0; i < sband->n_channels; i++)
+ reg_process_ht_flags_channel(wiphy, band, i);
+}
+
+static void reg_process_ht_flags(struct wiphy *wiphy)
+{
+ enum ieee80211_band band;
+
+ if (!wiphy)
+ return;
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ if (wiphy->bands[band])
+ reg_process_ht_flags_band(wiphy, band);
+ }
+
+}
+
+static void wiphy_update_regulatory(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
+{
+ enum ieee80211_band band;
+
+ assert_reg_lock();
+
+ if (ignore_reg_update(wiphy, initiator))
+ return;
+
+ last_request->dfs_region = cfg80211_regdomain->dfs_region;
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ if (wiphy->bands[band])
+ handle_band(wiphy, band, initiator);
+ }
+
+ reg_process_beacons(wiphy);
+ reg_process_ht_flags(wiphy);
+ if (wiphy->reg_notifier)
+ wiphy->reg_notifier(wiphy, last_request);
+}
+
+void regulatory_update(struct wiphy *wiphy,
+ enum nl80211_reg_initiator setby)
+{
+ mutex_lock(&reg_mutex);
+ wiphy_update_regulatory(wiphy, setby);
+ mutex_unlock(&reg_mutex);
+}
+
+static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
+{
+ struct cfg80211_registered_device *rdev;
+ struct wiphy *wiphy;
+
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ wiphy = &rdev->wiphy;
+ wiphy_update_regulatory(wiphy, initiator);
+ /*
+ * Regulatory updates set by CORE are ignored for custom
+ * regulatory cards. Let us notify the changes to the driver,
+ * as some drivers used this to restore its orig_* reg domain.
+ */
+ if (initiator == NL80211_REGDOM_SET_BY_CORE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY &&
+ wiphy->reg_notifier)
+ wiphy->reg_notifier(wiphy, last_request);
+ }
+}
+
+static void handle_channel_custom(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ unsigned int chan_idx,
+ const struct ieee80211_regdomain *regd)
+{
+ int r;
+ u32 desired_bw_khz = MHZ_TO_KHZ(20);
+ u32 bw_flags = 0;
+ const struct ieee80211_reg_rule *reg_rule = NULL;
+ const struct ieee80211_power_rule *power_rule = NULL;
+ const struct ieee80211_freq_range *freq_range = NULL;
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *chan;
+
+ assert_reg_lock();
+
+ sband = wiphy->bands[band];
+ BUG_ON(chan_idx >= sband->n_channels);
+ chan = &sband->channels[chan_idx];
+
+ r = freq_reg_info_regd(wiphy,
+ MHZ_TO_KHZ(chan->center_freq),
+ desired_bw_khz,
+ &reg_rule,
+ regd);
+
+ if (r) {
+ REG_DBG_PRINT("Disabling freq %d MHz as custom "
+ "regd has no rule that fits a %d MHz "
+ "wide channel\n",
+ chan->center_freq,
+ KHZ_TO_MHZ(desired_bw_khz));
+ chan->flags = IEEE80211_CHAN_DISABLED;
+ return;
+ }
+
+ chan_reg_rule_print_dbg(chan, desired_bw_khz, reg_rule);
+
+ power_rule = &reg_rule->power_rule;
+ freq_range = &reg_rule->freq_range;
+
+ if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
+ bw_flags = IEEE80211_CHAN_NO_HT40;
+
+ 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_power = (int) MBM_TO_DBM(power_rule->max_eirp);
+}
+
+static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
+ const struct ieee80211_regdomain *regd)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ BUG_ON(!wiphy->bands[band]);
+ sband = wiphy->bands[band];
+
+ for (i = 0; i < sband->n_channels; i++)
+ handle_channel_custom(wiphy, band, i, regd);
+}
+
+/* Used by drivers prior to wiphy registration */
+void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
+ const struct ieee80211_regdomain *regd)
+{
+ enum ieee80211_band band;
+ unsigned int bands_set = 0;
+
+ mutex_lock(&reg_mutex);
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ if (!wiphy->bands[band])
+ continue;
+ handle_band_custom(wiphy, band, regd);
+ bands_set++;
+ }
+ mutex_unlock(&reg_mutex);
+
+ /*
+ * no point in calling this if it won't have any effect
+ * on your device's supportd bands.
+ */
+ WARN_ON(!bands_set);
+}
+EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
+
+/*
+ * Return value which can be used by ignore_request() to indicate
+ * it has been determined we should intersect two regulatory domains
+ */
+#define REG_INTERSECT 1
+
+/* This has the logic which determines when a new request
+ * should be ignored. */
+static int ignore_request(struct wiphy *wiphy,
+ struct regulatory_request *pending_request)
+{
+ struct wiphy *last_wiphy = NULL;
+
+ assert_cfg80211_lock();
+
+ /* All initial requests are respected */
+ if (!last_request)
+ return 0;
+
+ switch (pending_request->initiator) {
+ case NL80211_REGDOM_SET_BY_CORE:
+ return 0;
+ case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+
+ last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
+ if (unlikely(!is_an_alpha2(pending_request->alpha2)))
+ return -EINVAL;
+ if (last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ if (last_wiphy != wiphy) {
+ /*
+ * Two cards with two APs claiming different
+ * Country IE alpha2s. We could
+ * intersect them, but that seems unlikely
+ * to be correct. Reject second one for now.
+ */
+ if (regdom_changes(pending_request->alpha2))
+ return -EOPNOTSUPP;
+ return -EALREADY;
+ }
+ /*
+ * Two consecutive Country IE hints on the same wiphy.
+ * This should be picked up early by the driver/stack
+ */
+ if (WARN_ON(regdom_changes(pending_request->alpha2)))
+ return 0;
+ return -EALREADY;
+ }
+ return 0;
+ case NL80211_REGDOM_SET_BY_DRIVER:
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
+ if (regdom_changes(pending_request->alpha2))
+ return 0;
+ return -EALREADY;
+ }
+
+ /*
+ * 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 (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+ !regdom_changes(pending_request->alpha2))
+ return -EALREADY;
+
+ return REG_INTERSECT;
+ case NL80211_REGDOM_SET_BY_USER:
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
+ return REG_INTERSECT;
+ /*
+ * If the user knows better the user should set the regdom
+ * to their country before the IE is picked up
+ */
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
+ last_request->intersect)
+ return -EOPNOTSUPP;
+ /*
+ * Process user requests only after previous user/driver/core
+ * requests have been processed
+ */
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
+ last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
+ last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
+ if (regdom_changes(last_request->alpha2))
+ return -EAGAIN;
+ }
+
+ if (!regdom_changes(pending_request->alpha2))
+ return -EALREADY;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static void reg_set_request_processed(void)
+{
+ bool need_more_processing = false;
+
+ last_request->processed = true;
+
+ spin_lock(&reg_requests_lock);
+ if (!list_empty(&reg_requests_list))
+ need_more_processing = true;
+ spin_unlock(&reg_requests_lock);
+
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)
+ cancel_delayed_work_sync(&reg_timeout);
+
+ if (need_more_processing)
+ schedule_work(&reg_work);
+}
+
+/**
+ * __regulatory_hint - hint to the wireless core a regulatory domain
+ * @wiphy: if the hint comes from country information from an AP, this
+ * is required to be set to the wiphy that received the information
+ * @pending_request: the regulatory request currently being processed
+ *
+ * The Wireless subsystem can use this function to hint to the wireless core
+ * what it believes should be the current regulatory domain.
+ *
+ * Returns zero if all went fine, %-EALREADY if a regulatory domain had
+ * already been set or other standard error codes.
+ *
+ * Caller must hold &cfg80211_mutex and &reg_mutex
+ */
+static int __regulatory_hint(struct wiphy *wiphy,
+ struct regulatory_request *pending_request)
+{
+ bool intersect = false;
+ int r = 0;
+
+ assert_cfg80211_lock();
+
+ r = ignore_request(wiphy, pending_request);
+
+ if (r == REG_INTERSECT) {
+ if (pending_request->initiator ==
+ NL80211_REGDOM_SET_BY_DRIVER) {
+ r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
+ if (r) {
+ kfree(pending_request);
+ return r;
+ }
+ }
+ intersect = true;
+ } else if (r) {
+ /*
+ * If the regulatory domain being requested by the
+ * driver has already been set just copy it to the
+ * wiphy
+ */
+ if (r == -EALREADY &&
+ pending_request->initiator ==
+ NL80211_REGDOM_SET_BY_DRIVER) {
+ r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
+ if (r) {
+ kfree(pending_request);
+ return r;
+ }
+ r = -EALREADY;
+ goto new_request;
+ }
+ kfree(pending_request);
+ return r;
+ }
+
+new_request:
+ if (last_request != &core_request_world)
+ kfree(last_request);
+
+ last_request = pending_request;
+ last_request->intersect = intersect;
+
+ pending_request = NULL;
+
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
+ user_alpha2[0] = last_request->alpha2[0];
+ user_alpha2[1] = last_request->alpha2[1];
+ }
+
+ /* When r == REG_INTERSECT we do need to call CRDA */
+ if (r < 0) {
+ /*
+ * 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 (r == -EALREADY) {
+ nl80211_send_reg_change_event(last_request);
+ reg_set_request_processed();
+ }
+ return r;
+ }
+
+ return call_crda(last_request->alpha2);
+}
+
+/* This processes *all* regulatory hints */
+static void reg_process_hint(struct regulatory_request *reg_request,
+ enum nl80211_reg_initiator reg_initiator)
+{
+ int r = 0;
+ struct wiphy *wiphy = NULL;
+
+ BUG_ON(!reg_request->alpha2);
+
+ if (wiphy_idx_valid(reg_request->wiphy_idx))
+ wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
+
+ if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+ !wiphy) {
+ kfree(reg_request);
+ return;
+ }
+
+ r = __regulatory_hint(wiphy, reg_request);
+ /* This is required so that the orig_* parameters are saved */
+ if (r == -EALREADY && wiphy &&
+ wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
+ wiphy_update_regulatory(wiphy, reg_initiator);
+ return;
+ }
+
+ /*
+ * We only time out user hints, given that they should be the only
+ * source of bogus requests.
+ */
+ if (r != -EALREADY &&
+ reg_initiator == NL80211_REGDOM_SET_BY_USER)
+ schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));
+}
+
+/*
+ * 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;
+
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
+
+ /* When last_request->processed becomes true this will be rescheduled */
+ if (last_request && !last_request->processed) {
+ REG_DBG_PRINT("Pending regulatory request, waiting "
+ "for it to be processed...\n");
+ goto out;
+ }
+
+ spin_lock(&reg_requests_lock);
+
+ if (list_empty(&reg_requests_list)) {
+ spin_unlock(&reg_requests_lock);
+ goto out;
+ }
+
+ reg_request = list_first_entry(&reg_requests_list,
+ struct regulatory_request,
+ list);
+ list_del_init(&reg_request->list);
+
+ spin_unlock(&reg_requests_lock);
+
+ reg_process_hint(reg_request, reg_request->initiator);
+
+out:
+ mutex_unlock(&reg_mutex);
+ mutex_unlock(&cfg80211_mutex);
+}
+
+/* Processes beacon hints -- this has nothing to do with country IEs */
+static void reg_process_pending_beacon_hints(void)
+{
+ struct cfg80211_registered_device *rdev;
+ struct reg_beacon *pending_beacon, *tmp;
+
+ /*
+ * No need to hold the reg_mutex here as we just touch wiphys
+ * and do not read or access regulatory variables.
+ */
+ mutex_lock(&cfg80211_mutex);
+
+ /* This goes through the _pending_ beacon list */
+ spin_lock_bh(&reg_pending_beacons_lock);
+
+ if (list_empty(&reg_pending_beacons)) {
+ spin_unlock_bh(&reg_pending_beacons_lock);
+ goto out;
+ }
+
+ 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);
+out:
+ mutex_unlock(&cfg80211_mutex);
+}
+
+static void reg_todo(struct work_struct *work)
+{
+ reg_process_pending_hints();
+ reg_process_pending_beacon_hints();
+}
+
+static void queue_regulatory_request(struct regulatory_request *request)
+{
+ if (isalpha(request->alpha2[0]))
+ request->alpha2[0] = toupper(request->alpha2[0]);
+ if (isalpha(request->alpha2[1]))
+ 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;
+
+ queue_regulatory_request(request);
+
+ return 0;
+}
+
+/* User hints */
+int regulatory_hint_user(const char *alpha2)
+{
+ struct regulatory_request *request;
+
+ BUG_ON(!alpha2);
+
+ request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
+ if (!request)
+ return -ENOMEM;
+
+ request->wiphy_idx = WIPHY_IDX_STALE;
+ request->alpha2[0] = alpha2[0];
+ request->alpha2[1] = alpha2[1];
+ request->initiator = NL80211_REGDOM_SET_BY_USER;
+
+ queue_regulatory_request(request);
+
+ return 0;
+}
+
+/* Driver hints */
+int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
+{
+ struct regulatory_request *request;
+
+ BUG_ON(!alpha2);
+ BUG_ON(!wiphy);
+
+ request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
+ if (!request)
+ return -ENOMEM;
+
+ request->wiphy_idx = get_wiphy_idx(wiphy);
+
+ /* Must have registered wiphy first */
+ BUG_ON(!wiphy_idx_valid(request->wiphy_idx));
+
+ request->alpha2[0] = alpha2[0];
+ request->alpha2[1] = alpha2[1];
+ request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
+
+ queue_regulatory_request(request);
+
+ return 0;
+}
+EXPORT_SYMBOL(regulatory_hint);
+
+/*
+ * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
+ * therefore cannot iterate over the rdev list here.
+ */
+void regulatory_hint_11d(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ u8 *country_ie,
+ u8 country_ie_len)
+{
+ char alpha2[2];
+ enum environment_cap env = ENVIRON_ANY;
+ struct regulatory_request *request;
+
+ mutex_lock(&reg_mutex);
+
+ if (unlikely(!last_request))
+ goto out;
+
+ /* IE len must be evenly divisible by 2 */
+ if (country_ie_len & 0x01)
+ goto out;
+
+ if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
+ goto out;
+
+ alpha2[0] = country_ie[0];
+ alpha2[1] = country_ie[1];
+
+ if (country_ie[2] == 'I')
+ env = ENVIRON_INDOOR;
+ else if (country_ie[2] == 'O')
+ env = ENVIRON_OUTDOOR;
+
+ /*
+ * We will run this only upon a successful connection on cfg80211.
+ * We leave conflict resolution to the workqueue, where can hold
+ * cfg80211_mutex.
+ */
+ if (likely(last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy_idx_valid(last_request->wiphy_idx)))
+ goto out;
+
+ request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
+ if (!request)
+ goto out;
+
+ request->wiphy_idx = get_wiphy_idx(wiphy);
+ request->alpha2[0] = alpha2[0];
+ request->alpha2[1] = alpha2[1];
+ request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
+ request->country_ie_env = env;
+
+ mutex_unlock(&reg_mutex);
+
+ queue_regulatory_request(request);
+
+ return;
+
+out:
+ mutex_unlock(&reg_mutex);
+}
+
+static void restore_alpha2(char *alpha2, bool reset_user)
+{
+ /* indicates there is no alpha2 to consider for restoration */
+ alpha2[0] = '9';
+ alpha2[1] = '7';
+
+ /* The user setting has precedence over the module parameter */
+ if (is_user_regdom_saved()) {
+ /* Unless we're asked to ignore it and reset it */
+ if (reset_user) {
+ REG_DBG_PRINT("Restoring regulatory settings "
+ "including user preference\n");
+ user_alpha2[0] = '9';
+ user_alpha2[1] = '7';
+
+ /*
+ * If we're ignoring user settings, we still need to
+ * check the module parameter to ensure we put things
+ * back as they were for a full restore.
+ */
+ if (!is_world_regdom(ieee80211_regdom)) {
+ REG_DBG_PRINT("Keeping preference on "
+ "module parameter ieee80211_regdom: %c%c\n",
+ ieee80211_regdom[0],
+ ieee80211_regdom[1]);
+ alpha2[0] = ieee80211_regdom[0];
+ alpha2[1] = ieee80211_regdom[1];
+ }
+ } else {
+ REG_DBG_PRINT("Restoring regulatory settings "
+ "while preserving user preference for: %c%c\n",
+ user_alpha2[0],
+ user_alpha2[1]);
+ alpha2[0] = user_alpha2[0];
+ alpha2[1] = user_alpha2[1];
+ }
+ } else if (!is_world_regdom(ieee80211_regdom)) {
+ REG_DBG_PRINT("Keeping preference on "
+ "module parameter ieee80211_regdom: %c%c\n",
+ ieee80211_regdom[0],
+ ieee80211_regdom[1]);
+ alpha2[0] = ieee80211_regdom[0];
+ alpha2[1] = ieee80211_regdom[1];
+ } else
+ REG_DBG_PRINT("Restoring regulatory settings\n");
+}
+
+static void restore_custom_reg_settings(struct wiphy *wiphy)
+{
+ struct ieee80211_supported_band *sband;
+ enum ieee80211_band band;
+ struct ieee80211_channel *chan;
+ int i;
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ sband = wiphy->bands[band];
+ if (!sband)
+ continue;
+ for (i = 0; i < sband->n_channels; i++) {
+ chan = &sband->channels[i];
+ chan->flags = chan->orig_flags;
+ chan->max_antenna_gain = chan->orig_mag;
+ chan->max_power = chan->orig_mpwr;
+ }
+ }
+}
+
+/*
+ * Restoring regulatory settings involves ingoring any
+ * possibly stale country IE information and user regulatory
+ * settings if so desired, this includes any beacon hints
+ * learned as we could have traveled outside to another country
+ * after disconnection. To restore regulatory settings we do
+ * exactly what we did at bootup:
+ *
+ * - send a core regulatory hint
+ * - send a user regulatory hint if applicable
+ *
+ * Device drivers that send a regulatory hint for a specific country
+ * keep their own regulatory domain on wiphy->regd so that does does
+ * not need to be remembered.
+ */
+static void restore_regulatory_settings(bool reset_user)
+{
+ char alpha2[2];
+ char world_alpha2[2];
+ struct reg_beacon *reg_beacon, *btmp;
+ struct regulatory_request *reg_request, *tmp;
+ LIST_HEAD(tmp_reg_req_list);
+ struct cfg80211_registered_device *rdev;
+
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
+
+ reset_regdomains(true);
+ 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);
+ if (!list_empty(&reg_requests_list)) {
+ list_for_each_entry_safe(reg_request, tmp,
+ &reg_requests_list, list) {
+ if (reg_request->initiator !=
+ NL80211_REGDOM_SET_BY_USER)
+ continue;
+ list_del(&reg_request->list);
+ list_add_tail(&reg_request->list, &tmp_reg_req_list);
+ }
+ }
+ spin_unlock(&reg_requests_lock);
+
+ /* Clear beacon hints */
+ spin_lock_bh(&reg_pending_beacons_lock);
+ if (!list_empty(&reg_pending_beacons)) {
+ 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);
+
+ if (!list_empty(&reg_beacon_list)) {
+ 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 */
+ cfg80211_regdomain = cfg80211_world_regdom;
+ world_alpha2[0] = cfg80211_regdomain->alpha2[0];
+ world_alpha2[1] = cfg80211_regdomain->alpha2[1];
+
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY)
+ restore_custom_reg_settings(&rdev->wiphy);
+ }
+
+ mutex_unlock(&reg_mutex);
+ mutex_unlock(&cfg80211_mutex);
+
+ regulatory_hint_core(world_alpha2);
+
+ /*
+ * This restores the ieee80211_regdom module parameter
+ * preference or the last user requested regulatory
+ * settings, user regulatory settings takes precedence.
+ */
+ if (is_an_alpha2(alpha2))
+ regulatory_hint_user(user_alpha2);
+
+ if (list_empty(&tmp_reg_req_list))
+ return;
+
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
+
+ spin_lock(&reg_requests_lock);
+ list_for_each_entry_safe(reg_request, tmp, &tmp_reg_req_list, list) {
+ REG_DBG_PRINT("Adding request for country %c%c back "
+ "into the queue\n",
+ reg_request->alpha2[0],
+ reg_request->alpha2[1]);
+ list_del(&reg_request->list);
+ list_add_tail(&reg_request->list, &reg_requests_list);
+ }
+ spin_unlock(&reg_requests_lock);
+
+ mutex_unlock(&reg_mutex);
+ mutex_unlock(&cfg80211_mutex);
+
+ REG_DBG_PRINT("Kicking the queue\n");
+
+ schedule_work(&reg_work);
+}
+
+void regulatory_hint_disconnect(void)
+{
+ REG_DBG_PRINT("All devices are disconnected, going to "
+ "restore regulatory settings\n");
+ restore_regulatory_settings(false);
+}
+
+static bool freq_is_chan_12_13_14(u16 freq)
+{
+ if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) ||
+ freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) ||
+ freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ))
+ return true;
+ return false;
+}
+
+int regulatory_hint_found_beacon(struct wiphy *wiphy,
+ struct ieee80211_channel *beacon_chan,
+ gfp_t gfp)
+{
+ struct reg_beacon *reg_beacon;
+
+ if (likely((beacon_chan->beacon_found ||
+ (beacon_chan->flags & IEEE80211_CHAN_RADAR) ||
+ (beacon_chan->band == IEEE80211_BAND_2GHZ &&
+ !freq_is_chan_12_13_14(beacon_chan->center_freq)))))
+ return 0;
+
+ reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
+ if (!reg_beacon)
+ return -ENOMEM;
+
+ REG_DBG_PRINT("Found new beacon on "
+ "frequency: %d MHz (Ch %d) on %s\n",
+ beacon_chan->center_freq,
+ ieee80211_frequency_to_channel(beacon_chan->center_freq),
+ wiphy_name(wiphy));
+
+ memcpy(&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;
+
+ pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
+
+ for (i = 0; i < rd->n_reg_rules; i++) {
+ reg_rule = &rd->reg_rules[i];
+ freq_range = &reg_rule->freq_range;
+ power_rule = &reg_rule->power_rule;
+
+ /*
+ * There may not be documentation for max antenna gain
+ * in certain regions
+ */
+ if (power_rule->max_antenna_gain)
+ pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
+ freq_range->start_freq_khz,
+ freq_range->end_freq_khz,
+ freq_range->max_bandwidth_khz,
+ power_rule->max_antenna_gain,
+ power_rule->max_eirp);
+ else
+ pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
+ freq_range->start_freq_khz,
+ freq_range->end_freq_khz,
+ freq_range->max_bandwidth_khz,
+ power_rule->max_eirp);
+ }
+}
+
+bool reg_supported_dfs_region(u8 dfs_region)
+{
+ switch (dfs_region) {
+ case NL80211_DFS_UNSET:
+ case NL80211_DFS_FCC:
+ case NL80211_DFS_ETSI:
+ case NL80211_DFS_JP:
+ return true;
+ default:
+ REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
+ dfs_region);
+ return false;
+ }
+}
+
+static void print_dfs_region(u8 dfs_region)
+{
+ if (!dfs_region)
+ return;
+
+ switch (dfs_region) {
+ case NL80211_DFS_FCC:
+ pr_info(" DFS Master region FCC");
+ break;
+ case NL80211_DFS_ETSI:
+ pr_info(" DFS Master region ETSI");
+ break;
+ case NL80211_DFS_JP:
+ pr_info(" DFS Master region JP");
+ break;
+ default:
+ pr_info(" DFS Master region Uknown");
+ break;
+ }
+}
+
+static void print_regdomain(const struct ieee80211_regdomain *rd)
+{
+
+ if (is_intersected_alpha2(rd->alpha2)) {
+
+ if (last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ struct cfg80211_registered_device *rdev;
+ rdev = cfg80211_rdev_by_wiphy_idx(
+ last_request->wiphy_idx);
+ if (rdev) {
+ pr_info("Current regulatory domain updated by AP to: %c%c\n",
+ rdev->country_ie_alpha2[0],
+ rdev->country_ie_alpha2[1]);
+ } else
+ pr_info("Current regulatory domain intersected:\n");
+ } else
+ pr_info("Current regulatory domain intersected:\n");
+ } else if (is_world_regdom(rd->alpha2))
+ pr_info("World regulatory domain updated:\n");
+ else {
+ if (is_unknown_alpha2(rd->alpha2))
+ pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
+ else
+ pr_info("Regulatory domain changed to country: %c%c\n",
+ rd->alpha2[0], rd->alpha2[1]);
+ }
+ print_dfs_region(rd->dfs_region);
+ print_rd_rules(rd);
+}
+
+static void print_regdomain_info(const struct ieee80211_regdomain *rd)
+{
+ pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
+ print_rd_rules(rd);
+}
+
+/* Takes ownership of rd only if it doesn't fail */
+static int __set_regdom(const struct ieee80211_regdomain *rd)
+{
+ const struct ieee80211_regdomain *intersected_rd = NULL;
+ struct cfg80211_registered_device *rdev = NULL;
+ struct wiphy *request_wiphy;
+ /* Some basic sanity checks first */
+
+ if (is_world_regdom(rd->alpha2)) {
+ if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
+ return -EINVAL;
+ update_world_regdomain(rd);
+ return 0;
+ }
+
+ if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
+ !is_unknown_alpha2(rd->alpha2))
+ return -EINVAL;
+
+ if (!last_request)
+ 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 (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ /*
+ * If someone else asked us to change the rd lets only bother
+ * checking if the alpha2 changes if CRDA was already called
+ */
+ if (!regdom_changes(rd->alpha2))
+ return -EINVAL;
+ }
+
+ /*
+ * Now lets set the regulatory domain, update all driver channels
+ * and finally inform them of what we have done, in case they want
+ * to review or adjust their own settings based on their own
+ * internal EEPROM data
+ */
+
+ if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
+ return -EINVAL;
+
+ if (!is_valid_rd(rd)) {
+ pr_err("Invalid regulatory domain detected:\n");
+ print_regdomain_info(rd);
+ return -EINVAL;
+ }
+
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+ if (!request_wiphy &&
+ (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
+ last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) {
+ schedule_delayed_work(&reg_timeout, 0);
+ return -ENODEV;
+ }
+
+ if (!last_request->intersect) {
+ int r;
+
+ if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
+ reset_regdomains(false);
+ cfg80211_regdomain = rd;
+ return 0;
+ }
+
+ /*
+ * For a driver hint, lets copy the regulatory domain the
+ * driver wanted to the wiphy to deal with conflicts
+ */
+
+ /*
+ * Userspace could have sent two replies with only
+ * one kernel request.
+ */
+ if (request_wiphy->regd)
+ return -EALREADY;
+
+ r = reg_copy_regd(&request_wiphy->regd, rd);
+ if (r)
+ return r;
+
+ reset_regdomains(false);
+ cfg80211_regdomain = rd;
+ return 0;
+ }
+
+ /* Intersection requires a bit more work */
+
+ if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+
+ intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
+ if (!intersected_rd)
+ return -EINVAL;
+
+ /*
+ * We can trash what CRDA provided now.
+ * However if a driver requested this specific regulatory
+ * domain we keep it for its private use
+ */
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
+ request_wiphy->regd = rd;
+ else
+ kfree(rd);
+
+ rd = NULL;
+
+ reset_regdomains(false);
+ cfg80211_regdomain = intersected_rd;
+
+ return 0;
+ }
+
+ if (!intersected_rd)
+ return -EINVAL;
+
+ rdev = wiphy_to_dev(request_wiphy);
+
+ rdev->country_ie_alpha2[0] = rd->alpha2[0];
+ rdev->country_ie_alpha2[1] = rd->alpha2[1];
+ rdev->env = last_request->country_ie_env;
+
+ BUG_ON(intersected_rd == rd);
+
+ kfree(rd);
+ rd = NULL;
+
+ reset_regdomains(false);
+ cfg80211_regdomain = intersected_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. Caller must hold cfg80211_mutex
+ */
+int set_regdom(const struct ieee80211_regdomain *rd)
+{
+ int r;
+
+ assert_cfg80211_lock();
+
+ mutex_lock(&reg_mutex);
+
+ /* Note that this doesn't update the wiphys, this is done below */
+ r = __set_regdom(rd);
+ if (r) {
+ kfree(rd);
+ mutex_unlock(&reg_mutex);
+ return r;
+ }
+
+ /* This would make this whole thing pointless */
+ if (!last_request->intersect)
+ BUG_ON(rd != cfg80211_regdomain);
+
+ /* update all wiphys now with the new established regulatory domain */
+ update_all_wiphy_regulatory(last_request->initiator);
+
+ print_regdomain(cfg80211_regdomain);
+
+ nl80211_send_reg_change_event(last_request);
+
+ reg_set_request_processed();
+
+ mutex_unlock(&reg_mutex);
+
+ return r;
+}
+
+#ifdef CONFIG_HOTPLUG
+int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ if (last_request && !last_request->processed) {
+ if (add_uevent_var(env, "COUNTRY=%c%c",
+ last_request->alpha2[0],
+ last_request->alpha2[1]))
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+#else
+int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_HOTPLUG */
+
+/* Caller must hold cfg80211_mutex */
+void reg_device_remove(struct wiphy *wiphy)
+{
+ struct wiphy *request_wiphy = NULL;
+
+ assert_cfg80211_lock();
+
+ mutex_lock(&reg_mutex);
+
+ kfree(wiphy->regd);
+
+ if (last_request)
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
+ if (!request_wiphy || request_wiphy != wiphy)
+ goto out;
+
+ last_request->wiphy_idx = WIPHY_IDX_STALE;
+ last_request->country_ie_env = ENVIRON_ANY;
+out:
+ mutex_unlock(&reg_mutex);
+}
+
+static void reg_timeout_work(struct work_struct *work)
+{
+ REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "
+ "restoring regulatory settings\n");
+ restore_regulatory_settings(true);
+}
+
+int __init regulatory_init(void)
+{
+ int err = 0;
+
+ reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
+ if (IS_ERR(reg_pdev))
+ return PTR_ERR(reg_pdev);
+
+ reg_pdev->dev.type = &reg_device_type;
+
+ spin_lock_init(&reg_requests_lock);
+ spin_lock_init(&reg_pending_beacons_lock);
+
+ cfg80211_regdomain = cfg80211_world_regdom;
+
+ user_alpha2[0] = '9';
+ user_alpha2[1] = '7';
+
+ /* We always try to get an update for the static regdomain */
+ err = regulatory_hint_core(cfg80211_regdomain->alpha2);
+ if (err) {
+ if (err == -ENOMEM)
+ return err;
+ /*
+ * N.B. kobject_uevent_env() can fail mainly for when we're out
+ * memory which is handled and propagated appropriately above
+ * but it can also fail during a netlink_broadcast() or during
+ * early boot for call_usermodehelper(). For now treat these
+ * errors as non-fatal.
+ */
+ pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
+#ifdef CONFIG_CFG80211_REG_DEBUG
+ /* We want to find out exactly why when debugging */
+ WARN_ON(err);
+#endif
+ }
+
+ /*
+ * 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);
+
+ return 0;
+}
+
+void /* __init_or_exit */ regulatory_exit(void)
+{
+ struct regulatory_request *reg_request, *tmp;
+ struct reg_beacon *reg_beacon, *btmp;
+
+ cancel_work_sync(&reg_work);
+ cancel_delayed_work_sync(&reg_timeout);
+
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(&reg_mutex);
+
+ reset_regdomains(true);
+
+ dev_set_uevent_suppress(&reg_pdev->dev, true);
+
+ platform_device_unregister(reg_pdev);
+
+ spin_lock_bh(&reg_pending_beacons_lock);
+ if (!list_empty(&reg_pending_beacons)) {
+ 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);
+
+ if (!list_empty(&reg_beacon_list)) {
+ list_for_each_entry_safe(reg_beacon, btmp,
+ &reg_beacon_list, list) {
+ list_del(&reg_beacon->list);
+ kfree(reg_beacon);
+ }
+ }
+
+ spin_lock(&reg_requests_lock);
+ if (!list_empty(&reg_requests_list)) {
+ list_for_each_entry_safe(reg_request, tmp,
+ &reg_requests_list, list) {
+ list_del(&reg_request->list);
+ kfree(reg_request);
+ }
+ }
+ spin_unlock(&reg_requests_lock);
+
+ mutex_unlock(&reg_mutex);
+ mutex_unlock(&cfg80211_mutex);
+}