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Diffstat (limited to 'net/wireless/reg.c')
| -rw-r--r-- | net/wireless/reg.c | 2410 |
1 files changed, 2410 insertions, 0 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c new file mode 100644 index 0000000..ac4651c --- /dev/null +++ b/net/wireless/reg.c @@ -0,0 +1,2410 @@ +/* + * 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/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 CPTCFG_CFG80211_REG_DEBUG +#define REG_DBG_PRINT(format, args...) \ + printk(KERN_DEBUG pr_fmt(format), ##args) +#else +#define REG_DBG_PRINT(args...) +#endif + +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 */ +static struct regulatory_request __rcu *last_request = + (void __rcu *)&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 __rcu *cfg80211_regdomain; + +/* + * Protects static reg.c components: + * - cfg80211_regdomain (if not used with RCU) + * - cfg80211_world_regdom + * - last_request (if not used with RCU) + * - reg_num_devs_support_basehint + */ +static DEFINE_MUTEX(reg_mutex); + +/* + * Number of devices that registered to the core + * that support cellular base station regulatory hints + */ +static int reg_num_devs_support_basehint; + +static inline void assert_reg_lock(void) +{ + lockdep_assert_held(®_mutex); +} + +static const struct ieee80211_regdomain *get_cfg80211_regdom(void) +{ + return rcu_dereference_protected(cfg80211_regdomain, + lockdep_is_held(®_mutex)); +} + +static const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy) +{ + return rcu_dereference_protected(wiphy->regd, + lockdep_is_held(®_mutex)); +} + +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_check(last_request, + lockdep_is_held(®_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 = 6, + .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, 40, 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, 80, 6, 20, + NL80211_RRF_PASSIVE_SCAN | + NL80211_RRF_NO_IBSS), + + /* NB: 5260 MHz - 5700 MHz requires DFS */ + + /* IEEE 802.11a, channel 149..165 */ + REG_RULE(5745-10, 5825+10, 80, 6, 20, + NL80211_RRF_PASSIVE_SCAN | + NL80211_RRF_NO_IBSS), + + /* IEEE 802.11ad (60gHz), channels 1..3 */ + REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0), + } +}; + +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, + const struct ieee80211_regdomain *new_regdom) +{ + const struct ieee80211_regdomain *r; + struct regulatory_request *lr; + + assert_reg_lock(); + + 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; + + lr = get_last_request(); + if (lr != &core_request_world && lr) + kfree_rcu(lr, rcu_head); + rcu_assign_pointer(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; + int size_of_regd; + unsigned int i; + + size_of_regd = + sizeof(struct ieee80211_regdomain) + + src_regd->n_reg_rules * sizeof(struct ieee80211_reg_rule); + + regd = kzalloc(size_of_regd, GFP_KERNEL); + if (!regd) + return ERR_PTR(-ENOMEM); + + memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain)); + + for (i = 0; i < src_regd->n_reg_rules; i++) + memcpy(®d->reg_rules[i], &src_regd->reg_rules[i], + sizeof(struct ieee80211_reg_rule)); + + return regd; +} + +#ifdef CPTCFG_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 = NULL; + int i; + + mutex_lock(&cfg80211_mutex); + + mutex_lock(®_regdb_search_mutex); + while (!list_empty(®_regdb_search_list)) { + request = list_first_entry(®_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 (alpha2_equal(request->alpha2, curdom->alpha2)) { + regdom = reg_copy_regd(curdom); + break; + } + } + + kfree(request); + } + mutex_unlock(®_regdb_search_mutex); + + if (!IS_ERR_OR_NULL(regdom)) + set_regdom(regdom); + + mutex_unlock(&cfg80211_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(®_regdb_search_mutex); + list_add_tail(&request->list, ®_regdb_search_list); + mutex_unlock(®_regdb_search_mutex); + + schedule_work(®_regdb_work); +} + +/* Feel free to add any other sanity checks here */ +static void reg_regdb_size_check(void) +{ + /* We should ideally BUILD_BUG_ON() but then random builds would fail */ + WARN_ONCE(!reg_regdb_size, "db.txt is empty, you should update it..."); +} +#else +static inline void reg_regdb_size_check(void) {} +static inline void reg_regdb_query(const char *alpha2) {} +#endif /* CPTCFG_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(®_pdev->dev.kobj, KOBJ_CHANGE); +} + +static 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); +} + +/* 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", the "5 GHz band" and the "60GHz band"), + * however it is safe for now to assume that a frequency rule should not be + * part of a frequency's band if the start freq or end freq are off by more + * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the + * 60 GHz band. + * This resolution can be lowered and should be considered as we add + * regulatory rule support for other "bands". + **/ +static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, + u32 freq_khz) +{ +#define ONE_GHZ_IN_KHZ 1000000 + /* + * From 802.11ad: directional multi-gigabit (DMG): + * Pertaining to operation in a frequency band containing a channel + * with the Channel starting frequency above 45 GHz. + */ + u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ? + 10 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ; + if (abs(freq_khz - freq_range->start_freq_khz) <= limit) + return true; + if (abs(freq_khz - freq_range->end_freq_khz) <= limit) + return true; + return false; +#undef ONE_GHZ_IN_KHZ +} + +/* + * Helper for regdom_intersect(), this does the real + * mathematical intersection fun + */ +static int reg_rules_intersect(const struct ieee80211_reg_rule *rule1, + const struct ieee80211_reg_rule *rule2, + struct ieee80211_reg_rule *intersected_rule) +{ + const struct ieee80211_freq_range *freq_range1, *freq_range2; + struct ieee80211_freq_range *freq_range; + const struct ieee80211_power_rule *power_rule1, *power_rule2; + struct ieee80211_power_rule *power_rule; + u32 freq_diff; + + freq_range1 = &rule1->freq_range; + freq_range2 = &rule2->freq_range; + freq_range = &intersected_rule->freq_range; + + power_rule1 = &rule1->power_rule; + power_rule2 = &rule2->power_rule; + power_rule = &intersected_rule->power_rule; + + freq_range->start_freq_khz = max(freq_range1->start_freq_khz, + freq_range2->start_freq_khz); + freq_range->end_freq_khz = min(freq_range1->end_freq_khz, + freq_range2->end_freq_khz); + freq_range->max_bandwidth_khz = min(freq_range1->max_bandwidth_khz, + freq_range2->max_bandwidth_khz); + + freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz; + if (freq_range->max_bandwidth_khz > freq_diff) + freq_range->max_bandwidth_khz = freq_diff; + + power_rule->max_eirp = min(power_rule1->max_eirp, + power_rule2->max_eirp); + power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain, + power_rule2->max_antenna_gain); + + intersected_rule->flags = rule1->flags | rule2->flags; + + if (!is_valid_reg_rule(intersected_rule)) + return -EINVAL; + + return 0; +} + +/** + * regdom_intersect - do the intersection between two regulatory domains + * @rd1: first regulatory domain + * @rd2: second regulatory domain + * + * Use this function to get the intersection between two regulatory domains. + * Once completed we will mark the alpha2 for the rd as intersected, "98", + * as no one single alpha2 can represent this regulatory domain. + * + * Returns a pointer to the regulatory domain structure which will hold the + * resulting intersection of rules between rd1 and rd2. We will + * kzalloc() this structure for you. + */ +static struct ieee80211_regdomain * +regdom_intersect(const struct ieee80211_regdomain *rd1, + const struct ieee80211_regdomain *rd2) +{ + int r, size_of_regd; + unsigned int x, y; + unsigned int num_rules = 0, rule_idx = 0; + const struct ieee80211_reg_rule *rule1, *rule2; + struct ieee80211_reg_rule *intersected_rule; + struct ieee80211_regdomain *rd; + /* This is just a dummy holder to help us count */ + struct ieee80211_reg_rule dummy_rule; + + if (!rd1 || !rd2) + return NULL; + + /* + * First we get a count of the rules we'll need, then we actually + * build them. This is to so we can malloc() and free() a + * regdomain once. The reason we use reg_rules_intersect() here + * is it will return -EINVAL if the rule computed makes no sense. + * All rules that do check out OK are valid. + */ + + for (x = 0; x < rd1->n_reg_rules; x++) { + rule1 = &rd1->reg_rules[x]; + for (y = 0; y < rd2->n_reg_rules; y++) { + rule2 = &rd2->reg_rules[y]; + if (!reg_rules_intersect(rule1, rule2, &dummy_rule)) + num_rules++; + } + } + + if (!num_rules) + return NULL; + + size_of_regd = sizeof(struct ieee80211_regdomain) + + num_rules * sizeof(struct ieee80211_reg_rule); + + rd = kzalloc(size_of_regd, GFP_KERNEL); + if (!rd) + return NULL; + + for (x = 0; x < rd1->n_reg_rules && rule_idx < num_rules; x++) { + rule1 = &rd1->reg_rules[x]; + for (y = 0; y < rd2->n_reg_rules && rule_idx < num_rules; y++) { + rule2 = &rd2->reg_rules[y]; + /* + * This time around instead of using the stack lets + * write to the target rule directly saving ourselves + * a memcpy() + */ + intersected_rule = &rd->reg_rules[rule_idx]; + r = reg_rules_intersect(rule1, rule2, intersected_rule); + /* + * No need to memset here the intersected rule here as + * we're not using the stack anymore + */ + if (r) + continue; + rule_idx++; + } + } + + if (rule_idx != num_rules) { + kfree(rd); + return NULL; + } + + rd->n_reg_rules = num_rules; + rd->alpha2[0] = '9'; + rd->alpha2[1] = '8'; + + return rd; +} + +/* + * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may + * want to just have the channel structure use these + */ +static u32 map_regdom_flags(u32 rd_flags) +{ + u32 channel_flags = 0; + if (rd_flags & NL80211_RRF_PASSIVE_SCAN) + channel_flags |= IEEE80211_CHAN_PASSIVE_SCAN; + if (rd_flags & NL80211_RRF_NO_IBSS) + channel_flags |= IEEE80211_CHAN_NO_IBSS; + if (rd_flags & NL80211_RRF_DFS) + channel_flags |= IEEE80211_CHAN_RADAR; + if (rd_flags & NL80211_RRF_NO_OFDM) + channel_flags |= IEEE80211_CHAN_NO_OFDM; + return channel_flags; +} + +static const struct ieee80211_reg_rule * +freq_reg_info_regd(struct wiphy *wiphy, u32 center_freq, + const struct ieee80211_regdomain *regd) +{ + int i; + bool band_rule_found = false; + bool bw_fits = false; + + if (!regd) + return ERR_PTR(-EINVAL); + + for (i = 0; i < regd->n_reg_rules; i++) { + const struct ieee80211_reg_rule *rr; + const struct ieee80211_freq_range *fr = NULL; + + rr = ®d->reg_rules[i]; + fr = &rr->freq_range; + + /* + * We only need to know if one frequency rule was + * was in center_freq's band, that's enough, so lets + * not overwrite it once found + */ + if (!band_rule_found) + band_rule_found = freq_in_rule_band(fr, center_freq); + + bw_fits = reg_does_bw_fit(fr, center_freq, MHZ_TO_KHZ(20)); + + if (band_rule_found && bw_fits) + return rr; + } + + if (!band_rule_found) + return ERR_PTR(-ERANGE); + + return ERR_PTR(-EINVAL); +} + +const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy, + u32 center_freq) +{ + const struct ieee80211_regdomain *regd; + struct regulatory_request *lr = get_last_request(); + + /* + * Follow the driver's regulatory domain, if present, unless a country + * IE has been processed or a user wants to help complaince further + */ + if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && + lr->initiator != NL80211_REGDOM_SET_BY_USER && + wiphy->regd) + regd = get_wiphy_regdom(wiphy); + else + regd = get_cfg80211_regdom(); + + return freq_reg_info_regd(wiphy, center_freq, regd); +} +EXPORT_SYMBOL(freq_reg_info); + +#ifdef CPTCFG_CFG80211_REG_DEBUG +static const char *reg_initiator_name(enum nl80211_reg_initiator initiator) +{ + switch (initiator) { + case NL80211_REGDOM_SET_BY_CORE: + return "Set by core"; + case NL80211_REGDOM_SET_BY_USER: + return "Set by user"; + case NL80211_REGDOM_SET_BY_DRIVER: + return "Set by driver"; + case NL80211_REGDOM_SET_BY_COUNTRY_IE: + return "Set by country IE"; + default: + WARN_ON(1); + return "Set by bug"; + } +} + +static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, + const struct ieee80211_reg_rule *reg_rule) +{ + const struct ieee80211_power_rule *power_rule; + const struct ieee80211_freq_range *freq_range; + char max_antenna_gain[32]; + + power_rule = ®_rule->power_rule; + freq_range = ®_rule->freq_range; + + if (!power_rule->max_antenna_gain) + snprintf(max_antenna_gain, 32, "N/A"); + else + snprintf(max_antenna_gain, 32, "%d", power_rule->max_antenna_gain); + + REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n", + chan->center_freq); + + REG_DBG_PRINT("%d KHz - %d KHz @ %d KHz), (%s mBi, %d mBm)\n", + freq_range->start_freq_khz, freq_range->end_freq_khz, + freq_range->max_bandwidth_khz, max_antenna_gain, + power_rule->max_eirp); +} +#else +static void chan_reg_rule_print_dbg(struct ieee80211_channel *chan, + const struct ieee80211_reg_rule *reg_rule) +{ + return; +} +#endif + +/* + * Note that right now we assume the desired channel bandwidth + * is always 20 MHz for each individual channel (HT40 uses 20 MHz + * per channel, the primary and the extension channel). + */ +static void handle_channel(struct wiphy *wiphy, + enum nl80211_reg_initiator initiator, + struct ieee80211_channel *chan) +{ + u32 flags, bw_flags = 0; + const struct ieee80211_reg_rule *reg_rule = NULL; + const struct ieee80211_power_rule *power_rule = NULL; + const struct ieee80211_freq_range *freq_range = NULL; + struct wiphy *request_wiphy = NULL; + struct regulatory_request *lr = get_last_request(); + + request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); + + flags = chan->orig_flags; + + reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq)); + if (IS_ERR(reg_rule)) { + /* + * We will disable all channels that do not match our + * received regulatory rule unless the hint is coming + * from a Country IE and the Country IE had no information + * about a band. The IEEE 802.11 spec allows for an AP + * to send only a subset of the regulatory rules allowed, + * so an AP in the US that only supports 2.4 GHz may only send + * a country IE with information for the 2.4 GHz band + * while 5 GHz is still supported. + */ + if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && + PTR_ERR(reg_rule) == -ERANGE) + return; + + REG_DBG_PRINT("Disabling freq %d MHz\n", chan->center_freq); + chan->flags |= IEEE80211_CHAN_DISABLED; + return; + } + + chan_reg_rule_print_dbg(chan, reg_rule); + + power_rule = ®_rule->power_rule; + freq_range = ®_rule->freq_range; + + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) + bw_flags = IEEE80211_CHAN_NO_HT40; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80)) + bw_flags |= IEEE80211_CHAN_NO_80MHZ; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160)) + bw_flags |= IEEE80211_CHAN_NO_160MHZ; + + if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && + request_wiphy && request_wiphy == wiphy && + request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) { + /* + * This guarantees the driver's requested regulatory domain + * will always be used as a base for further regulatory + * settings + */ + chan->flags = chan->orig_flags = + map_regdom_flags(reg_rule->flags) | bw_flags; + chan->max_antenna_gain = chan->orig_mag = + (int) MBI_TO_DBI(power_rule->max_antenna_gain); + chan->max_reg_power = chan->max_power = chan->orig_mpwr = + (int) MBM_TO_DBM(power_rule->max_eirp); + return; + } + + chan->dfs_state = NL80211_DFS_USABLE; + chan->dfs_state_entered = jiffies; + + chan->beacon_found = false; + chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags); + chan->max_antenna_gain = + min_t(int, chan->orig_mag, + MBI_TO_DBI(power_rule->max_antenna_gain)); + chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp); + if (chan->orig_mpwr) { + /* + * Devices that have their own custom regulatory domain + * but also use WIPHY_FLAG_STRICT_REGULATORY will follow the + * passed country IE power settings. + */ + if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && + wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && + wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) + chan->max_power = chan->max_reg_power; + else + chan->max_power = min(chan->orig_mpwr, + chan->max_reg_power); + } else + chan->max_power = chan->max_reg_power; +} + +static void handle_band(struct wiphy *wiphy, + enum nl80211_reg_initiator initiator, + struct ieee80211_supported_band *sband) +{ + unsigned int i; + + if (!sband) + return; + + for (i = 0; i < sband->n_channels; i++) + handle_channel(wiphy, initiator, &sband->channels[i]); +} + +static bool reg_request_cell_base(struct regulatory_request *request) +{ + if (request->initiator != NL80211_REGDOM_SET_BY_USER) + return false; + return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE; +} + +bool reg_last_request_cell_base(void) +{ + bool val; + + mutex_lock(®_mutex); + val = reg_request_cell_base(get_last_request()); + mutex_unlock(®_mutex); + + return val; +} + +#ifdef CPTCFG_CFG80211_CERTIFICATION_ONUS +/* Core specific check */ +static enum reg_request_treatment +reg_ignore_cell_hint(struct regulatory_request *pending_request) +{ + struct regulatory_request *lr = get_last_request(); + + if (!reg_num_devs_support_basehint) + return REG_REQ_IGNORE; + + if (reg_request_cell_base(lr) && + !regdom_changes(pending_request->alpha2)) + return REG_REQ_ALREADY_SET; + + return REG_REQ_OK; +} + +/* Device specific check */ +static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) +{ + return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS); +} +#else +static int reg_ignore_cell_hint(struct regulatory_request *pending_request) +{ + return REG_REQ_IGNORE; +} + +static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy) +{ + return true; +} +#endif + + +static bool ignore_reg_update(struct wiphy *wiphy, + enum nl80211_reg_initiator initiator) +{ + struct regulatory_request *lr = get_last_request(); + + if (!lr) { + REG_DBG_PRINT("Ignoring regulatory request %s since last_request is not set\n", + reg_initiator_name(initiator)); + return true; + } + + if (initiator == NL80211_REGDOM_SET_BY_CORE && + wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) { + REG_DBG_PRINT("Ignoring regulatory request %s since the driver uses its own custom regulatory domain\n", + reg_initiator_name(initiator)); + return true; + } + + /* + * wiphy->regd will be set once the device has its own + * desired regulatory domain set + */ + if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd && + initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && + !is_world_regdom(lr->alpha2)) { + REG_DBG_PRINT("Ignoring regulatory request %s since the driver requires its own regulatory domain to be set first\n", + reg_initiator_name(initiator)); + return true; + } + + if (reg_request_cell_base(lr)) + return reg_dev_ignore_cell_hint(wiphy); + + return false; +} + +static bool reg_is_world_roaming(struct wiphy *wiphy) +{ + const struct ieee80211_regdomain *cr = get_cfg80211_regdom(); + const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy); + struct regulatory_request *lr = get_last_request(); + + if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2))) + return true; + + if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE && + wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY) + return true; + + return false; +} + +static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx, + struct reg_beacon *reg_beacon) +{ + struct ieee80211_supported_band *sband; + struct ieee80211_channel *chan; + bool channel_changed = false; + struct ieee80211_channel chan_before; + + sband = wiphy->bands[reg_beacon->chan.band]; + chan = &sband->channels[chan_idx]; + + if (likely(chan->center_freq != reg_beacon->chan.center_freq)) + return; + + if (chan->beacon_found) + return; + + chan->beacon_found = true; + + if (!reg_is_world_roaming(wiphy)) + return; + + if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS) + return; + + chan_before.center_freq = chan->center_freq; + chan_before.flags = chan->flags; + + if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) { + chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; + channel_changed = true; + } + + if (chan->flags & IEEE80211_CHAN_NO_IBSS) { + chan->flags &= ~IEEE80211_CHAN_NO_IBSS; + channel_changed = true; + } + + if (channel_changed) + nl80211_send_beacon_hint_event(wiphy, &chan_before, chan); +} + +/* + * Called when a scan on a wiphy finds a beacon on + * new channel + */ +static void wiphy_update_new_beacon(struct wiphy *wiphy, + struct reg_beacon *reg_beacon) +{ + unsigned int i; + struct ieee80211_supported_band *sband; + + if (!wiphy->bands[reg_beacon->chan.band]) + return; + + sband = wiphy->bands[reg_beacon->chan.band]; + + for (i = 0; i < sband->n_channels; i++) + handle_reg_beacon(wiphy, i, reg_beacon); +} + +/* + * Called upon reg changes or a new wiphy is added + */ +static void wiphy_update_beacon_reg(struct wiphy *wiphy) +{ + unsigned int i; + struct ieee80211_supported_band *sband; + struct reg_beacon *reg_beacon; + + list_for_each_entry(reg_beacon, ®_beacon_list, list) { + if (!wiphy->bands[reg_beacon->chan.band]) + continue; + sband = wiphy->bands[reg_beacon->chan.band]; + for (i = 0; i < sband->n_channels; i++) + handle_reg_beacon(wiphy, i, reg_beacon); + } +} + +/* Reap the advantages of previously found beacons */ +static void reg_process_beacons(struct wiphy *wiphy) +{ + /* + * Means we are just firing up cfg80211, so no beacons would + * have been processed yet. + */ + if (!last_request) + return; + wiphy_update_beacon_reg(wiphy); +} + +static bool is_ht40_allowed(struct ieee80211_channel *chan) +{ + if (!chan) + return false; + if (chan->flags & IEEE80211_CHAN_DISABLED) + return false; + /* This would happen when regulatory rules disallow HT40 completely */ + if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40) + return false; + return true; +} + +static void reg_process_ht_flags_channel(struct wiphy *wiphy, + struct ieee80211_channel *channel) +{ + struct ieee80211_supported_band *sband = wiphy->bands[channel->band]; + struct ieee80211_channel *channel_before = NULL, *channel_after = NULL; + unsigned int i; + + if (!is_ht40_allowed(channel)) { + channel->flags |= IEEE80211_CHAN_NO_HT40; + return; + } + + /* + * We need to ensure the extension channels exist to + * be able to use HT40- or HT40+, this finds them (or not) + */ + for (i = 0; i < sband->n_channels; i++) { + struct ieee80211_channel *c = &sband->channels[i]; + + if (c->center_freq == (channel->center_freq - 20)) + channel_before = c; + if (c->center_freq == (channel->center_freq + 20)) + channel_after = c; + } + + /* + * Please note that this assumes target bandwidth is 20 MHz, + * if that ever changes we also need to change the below logic + * to include that as well. + */ + if (!is_ht40_allowed(channel_before)) + channel->flags |= IEEE80211_CHAN_NO_HT40MINUS; + else + channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS; + + if (!is_ht40_allowed(channel_after)) + channel->flags |= IEEE80211_CHAN_NO_HT40PLUS; + else + channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS; +} + +static void reg_process_ht_flags_band(struct wiphy *wiphy, + struct ieee80211_supported_band *sband) +{ + unsigned int i; + + if (!sband) + return; + + for (i = 0; i < sband->n_channels; i++) + reg_process_ht_flags_channel(wiphy, &sband->channels[i]); +} + +static void reg_process_ht_flags(struct wiphy *wiphy) +{ + enum ieee80211_band band; + + if (!wiphy) + return; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) + reg_process_ht_flags_band(wiphy, wiphy->bands[band]); +} + +static void wiphy_update_regulatory(struct wiphy *wiphy, + enum nl80211_reg_initiator initiator) +{ + enum ieee80211_band band; + struct regulatory_request *lr = get_last_request(); + + if (ignore_reg_update(wiphy, initiator)) + return; + + lr->dfs_region = get_cfg80211_regdom()->dfs_region; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) + handle_band(wiphy, initiator, wiphy->bands[band]); + + reg_process_beacons(wiphy); + reg_process_ht_flags(wiphy); + + if (wiphy->reg_notifier) + wiphy->reg_notifier(wiphy, lr); +} + +static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) +{ + struct cfg80211_registered_device *rdev; + struct wiphy *wiphy; + + assert_cfg80211_lock(); + + list_for_each_entry(rdev, &cfg80211_rdev_list, list) { + wiphy = &rdev->wiphy; + wiphy_update_regulatory(wiphy, initiator); + /* + * Regulatory updates set by CORE are ignored for custom + * regulatory cards. Let us notify the changes to the driver, + * as some drivers used this to restore its orig_* reg domain. + */ + if (initiator == NL80211_REGDOM_SET_BY_CORE && + wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY && + wiphy->reg_notifier) + wiphy->reg_notifier(wiphy, get_last_request()); + } +} + +static void handle_channel_custom(struct wiphy *wiphy, + struct ieee80211_channel *chan, + const struct ieee80211_regdomain *regd) +{ + u32 bw_flags = 0; + const struct ieee80211_reg_rule *reg_rule = NULL; + const struct ieee80211_power_rule *power_rule = NULL; + const struct ieee80211_freq_range *freq_range = NULL; + + reg_rule = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq), + regd); + + if (IS_ERR(reg_rule)) { + REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n", + chan->center_freq); + chan->flags = IEEE80211_CHAN_DISABLED; + return; + } + + chan_reg_rule_print_dbg(chan, reg_rule); + + power_rule = ®_rule->power_rule; + freq_range = ®_rule->freq_range; + + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) + bw_flags = IEEE80211_CHAN_NO_HT40; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80)) + bw_flags |= IEEE80211_CHAN_NO_80MHZ; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160)) + bw_flags |= IEEE80211_CHAN_NO_160MHZ; + + chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; + chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); + chan->max_reg_power = chan->max_power = + (int) MBM_TO_DBM(power_rule->max_eirp); +} + +static void handle_band_custom(struct wiphy *wiphy, + struct ieee80211_supported_band *sband, + const struct ieee80211_regdomain *regd) +{ + unsigned int i; + + if (!sband) + return; + + for (i = 0; i < sband->n_channels; i++) + handle_channel_custom(wiphy, &sband->channels[i], regd); +} + +/* Used by drivers prior to wiphy registration */ +void wiphy_apply_custom_regulatory(struct wiphy *wiphy, + const struct ieee80211_regdomain *regd) +{ + enum ieee80211_band band; + unsigned int bands_set = 0; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) { + if (!wiphy->bands[band]) + continue; + handle_band_custom(wiphy, wiphy->bands[band], regd); + bands_set++; + } + + /* + * no point in calling this if it won't have any effect + * on your device's supported bands. + */ + WARN_ON(!bands_set); +} +EXPORT_SYMBOL(wiphy_apply_custom_regulatory); + +/* This has the logic which determines when a new request + * should be ignored. */ +static enum reg_request_treatment +get_reg_request_treatment(struct wiphy *wiphy, + struct regulatory_request *pending_request) +{ + struct wiphy *last_wiphy = NULL; + struct regulatory_request *lr = get_last_request(); + + /* All initial requests are respected */ + if (!lr) + return REG_REQ_OK; + + switch (pending_request->initiator) { + case NL80211_REGDOM_SET_BY_CORE: + return REG_REQ_OK; + case NL80211_REGDOM_SET_BY_COUNTRY_IE: + if (reg_request_cell_base(lr)) { + /* Trust a Cell base station over the AP's country IE */ + if (regdom_changes(pending_request->alpha2)) + return REG_REQ_IGNORE; + return REG_REQ_ALREADY_SET; + } + + last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); + + if (unlikely(!is_an_alpha2(pending_request->alpha2))) + return -EINVAL; + if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) { + if (last_wiphy != wiphy) { + /* + * Two cards with two APs claiming different + * Country IE alpha2s. We could + * intersect them, but that seems unlikely + * to be correct. Reject second one for now. + */ + if (regdom_changes(pending_request->alpha2)) + return REG_REQ_IGNORE; + return REG_REQ_ALREADY_SET; + } + /* + * Two consecutive Country IE hints on the same wiphy. + * This should be picked up early by the driver/stack + */ + if (WARN_ON(regdom_changes(pending_request->alpha2))) + return REG_REQ_OK; + return REG_REQ_ALREADY_SET; + } + return 0; + case NL80211_REGDOM_SET_BY_DRIVER: + if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) { + if (regdom_changes(pending_request->alpha2)) + return REG_REQ_OK; + return REG_REQ_ALREADY_SET; + } + + /* + * This would happen if you unplug and plug your card + * back in or if you add a new device for which the previously + * loaded card also agrees on the regulatory domain. + */ + if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && + !regdom_changes(pending_request->alpha2)) + return REG_REQ_ALREADY_SET; + + return REG_REQ_INTERSECT; + case NL80211_REGDOM_SET_BY_USER: + if (reg_request_cell_base(pending_request)) + return reg_ignore_cell_hint(pending_request); + + if (reg_request_cell_base(lr)) + return REG_REQ_IGNORE; + + if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) + return REG_REQ_INTERSECT; + /* + * If the user knows better the user should set the regdom + * to their country before the IE is picked up + */ + if (lr->initiator == NL80211_REGDOM_SET_BY_USER && + lr->intersect) + return REG_REQ_IGNORE; + /* + * Process user requests only after previous user/driver/core + * requests have been processed + */ + if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE || + lr->initiator == NL80211_REGDOM_SET_BY_DRIVER || + lr->initiator == NL80211_REGDOM_SET_BY_USER) && + regdom_changes(lr->alpha2)) + return REG_REQ_IGNORE; + + if (!regdom_changes(pending_request->alpha2)) + return REG_REQ_ALREADY_SET; + + return REG_REQ_OK; + } + + return REG_REQ_IGNORE; +} + +static void reg_set_request_processed(void) +{ + bool need_more_processing = false; + struct regulatory_request *lr = get_last_request(); + + lr->processed = true; + + spin_lock(®_requests_lock); + if (!list_empty(®_requests_list)) + need_more_processing = true; + spin_unlock(®_requests_lock); + + if (lr->initiator == NL80211_REGDOM_SET_BY_USER) + cancel_delayed_work(®_timeout); + + if (need_more_processing) + schedule_work(®_work); +} + +/** + * __regulatory_hint - hint to the wireless core a regulatory domain + * @wiphy: if the hint comes from country information from an AP, this + * is required to be set to the wiphy that received the information + * @pending_request: the regulatory request currently being processed + * + * The Wireless subsystem can use this function to hint to the wireless core + * what it believes should be the current regulatory domain. + * + * Returns one of the different reg request treatment values. + * + * Caller must hold ®_mutex + */ +static enum reg_request_treatment +__regulatory_hint(struct wiphy *wiphy, + struct regulatory_request *pending_request) +{ + const struct ieee80211_regdomain *regd; + bool intersect = false; + enum reg_request_treatment treatment; + struct regulatory_request *lr; + + treatment = get_reg_request_treatment(wiphy, pending_request); + + switch (treatment) { + case REG_REQ_INTERSECT: + if (pending_request->initiator == + NL80211_REGDOM_SET_BY_DRIVER) { + regd = reg_copy_regd(get_cfg80211_regdom()); + if (IS_ERR(regd)) { + kfree(pending_request); + return PTR_ERR(regd); + } + rcu_assign_pointer(wiphy->regd, regd); + } + intersect = true; + break; + case REG_REQ_OK: + break; + default: + /* + * If the regulatory domain being requested by the + * driver has already been set just copy it to the + * wiphy + */ + if (treatment == REG_REQ_ALREADY_SET && + pending_request->initiator == NL80211_REGDOM_SET_BY_DRIVER) { + regd = reg_copy_regd(get_cfg80211_regdom()); + if (IS_ERR(regd)) { + kfree(pending_request); + return REG_REQ_IGNORE; + } + treatment = REG_REQ_ALREADY_SET; + rcu_assign_pointer(wiphy->regd, regd); + goto new_request; + } + kfree(pending_request); + return treatment; + } + +new_request: + lr = get_last_request(); + if (lr != &core_request_world && lr) + kfree_rcu(lr, rcu_head); + + pending_request->intersect = intersect; + pending_request->processed = false; + rcu_assign_pointer(last_request, pending_request); + lr = pending_request; + + pending_request = NULL; + + if (lr->initiator == NL80211_REGDOM_SET_BY_USER) { + user_alpha2[0] = lr->alpha2[0]; + user_alpha2[1] = lr->alpha2[1]; + } + + /* When r == REG_REQ_INTERSECT we do need to call CRDA */ + if (treatment != REG_REQ_OK && treatment != REG_REQ_INTERSECT) { + /* + * Since CRDA will not be called in this case as we already + * have applied the requested regulatory domain before we just + * inform userspace we have processed the request + */ + if (treatment == REG_REQ_ALREADY_SET) { + nl80211_send_reg_change_event(lr); + reg_set_request_processed(); + } + return treatment; + } + + if (call_crda(lr->alpha2)) + return REG_REQ_IGNORE; + return REG_REQ_OK; +} + +/* This processes *all* regulatory hints */ +static void reg_process_hint(struct regulatory_request *reg_request, + enum nl80211_reg_initiator reg_initiator) +{ + struct wiphy *wiphy = NULL; + + if (WARN_ON(!reg_request->alpha2)) + return; + + if (reg_request->wiphy_idx != WIPHY_IDX_INVALID) + wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); + + if (reg_initiator == NL80211_REGDOM_SET_BY_DRIVER && !wiphy) { + kfree(reg_request); + return; + } + + switch (__regulatory_hint(wiphy, reg_request)) { + case REG_REQ_ALREADY_SET: + /* This is required so that the orig_* parameters are saved */ + if (wiphy && wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) + wiphy_update_regulatory(wiphy, reg_initiator); + break; + default: + if (reg_initiator == NL80211_REGDOM_SET_BY_USER) + schedule_delayed_work(®_timeout, + msecs_to_jiffies(3142)); + break; + } +} + +/* + * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* + * Regulatory hints come on a first come first serve basis and we + * must process each one atomically. + */ +static void reg_process_pending_hints(void) +{ + struct regulatory_request *reg_request, *lr; + + mutex_lock(&cfg80211_mutex); + mutex_lock(®_mutex); + lr = get_last_request(); + + /* When last_request->processed becomes true this will be rescheduled */ + if (lr && !lr->processed) { + REG_DBG_PRINT("Pending regulatory request, waiting for it to be processed...\n"); + goto out; + } + + spin_lock(®_requests_lock); + + if (list_empty(®_requests_list)) { + spin_unlock(®_requests_lock); + goto out; + } + + reg_request = list_first_entry(®_requests_list, + struct regulatory_request, + list); + list_del_init(®_request->list); + + spin_unlock(®_requests_lock); + + reg_process_hint(reg_request, reg_request->initiator); + +out: + mutex_unlock(®_mutex); + mutex_unlock(&cfg80211_mutex); +} + +/* Processes beacon hints -- this has nothing to do with country IEs */ +static void reg_process_pending_beacon_hints(void) +{ + struct cfg80211_registered_device *rdev; + struct reg_beacon *pending_beacon, *tmp; + + mutex_lock(&cfg80211_mutex); + mutex_lock(®_mutex); + + /* This goes through the _pending_ beacon list */ + spin_lock_bh(®_pending_beacons_lock); + + list_for_each_entry_safe(pending_beacon, tmp, + ®_pending_beacons, list) { + list_del_init(&pending_beacon->list); + + /* Applies the beacon hint to current wiphys */ + list_for_each_entry(rdev, &cfg80211_rdev_list, list) + wiphy_update_new_beacon(&rdev->wiphy, pending_beacon); + + /* Remembers the beacon hint for new wiphys or reg changes */ + list_add_tail(&pending_beacon->list, ®_beacon_list); + } + + spin_unlock_bh(®_pending_beacons_lock); + mutex_unlock(®_mutex); + mutex_unlock(&cfg80211_mutex); +} + +static void reg_todo(struct work_struct *work) +{ + reg_process_pending_hints(); + reg_process_pending_beacon_hints(); +} + +static void queue_regulatory_request(struct regulatory_request *request) +{ + request->alpha2[0] = toupper(request->alpha2[0]); + request->alpha2[1] = toupper(request->alpha2[1]); + + spin_lock(®_requests_lock); + list_add_tail(&request->list, ®_requests_list); + spin_unlock(®_requests_lock); + + schedule_work(®_work); +} + +/* + * Core regulatory hint -- happens during cfg80211_init() + * and when we restore regulatory settings. + */ +static int regulatory_hint_core(const char *alpha2) +{ + struct regulatory_request *request; + + request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); + if (!request) + return -ENOMEM; + + request->alpha2[0] = alpha2[0]; + request->alpha2[1] = alpha2[1]; + request->initiator = NL80211_REGDOM_SET_BY_CORE; + + queue_regulatory_request(request); + + return 0; +} + +/* User hints */ +int regulatory_hint_user(const char *alpha2, + enum nl80211_user_reg_hint_type user_reg_hint_type) +{ + struct regulatory_request *request; + + if (WARN_ON(!alpha2)) + return -EINVAL; + + request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); + if (!request) + return -ENOMEM; + + request->wiphy_idx = WIPHY_IDX_INVALID; + request->alpha2[0] = alpha2[0]; + request->alpha2[1] = alpha2[1]; + request->initiator = NL80211_REGDOM_SET_BY_USER; + request->user_reg_hint_type = user_reg_hint_type; + + queue_regulatory_request(request); + + return 0; +} + +/* Driver hints */ +int regulatory_hint(struct wiphy *wiphy, const char *alpha2) +{ + struct regulatory_request *request; + + if (WARN_ON(!alpha2 || !wiphy)) + return -EINVAL; + + request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); + if (!request) + return -ENOMEM; + + request->wiphy_idx = get_wiphy_idx(wiphy); + + request->alpha2[0] = alpha2[0]; + request->alpha2[1] = alpha2[1]; + request->initiator = NL80211_REGDOM_SET_BY_DRIVER; + + queue_regulatory_request(request); + + return 0; +} +EXPORT_SYMBOL(regulatory_hint); + +/* + * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and + * therefore cannot iterate over the rdev list here. + */ +void regulatory_hint_11d(struct wiphy *wiphy, enum ieee80211_band band, + const u8 *country_ie, u8 country_ie_len) +{ + char alpha2[2]; + enum environment_cap env = ENVIRON_ANY; + struct regulatory_request *request, *lr; + + mutex_lock(®_mutex); + lr = get_last_request(); + + if (unlikely(!lr)) + goto out; + + /* IE len must be evenly divisible by 2 */ + if (country_ie_len & 0x01) + goto out; + + if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN) + goto out; + + alpha2[0] = country_ie[0]; + alpha2[1] = country_ie[1]; + + if (country_ie[2] == 'I') + env = ENVIRON_INDOOR; + else if (country_ie[2] == 'O') + env = ENVIRON_OUTDOOR; + + /* + * We will run this only upon a successful connection on cfg80211. + * We leave conflict resolution to the workqueue, where can hold + * cfg80211_mutex. + */ + if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE && + lr->wiphy_idx != WIPHY_IDX_INVALID) + goto out; + + request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); + if (!request) + goto out; + + request->wiphy_idx = get_wiphy_idx(wiphy); + request->alpha2[0] = alpha2[0]; + request->alpha2[1] = alpha2[1]; + request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE; + request->country_ie_env = env; + + queue_regulatory_request(request); +out: + mutex_unlock(®_mutex); +} + +static void restore_alpha2(char *alpha2, bool reset_user) +{ + /* indicates there is no alpha2 to consider for restoration */ + alpha2[0] = '9'; + alpha2[1] = '7'; + + /* The user setting has precedence over the module parameter */ + if (is_user_regdom_saved()) { + /* Unless we're asked to ignore it and reset it */ + if (reset_user) { + REG_DBG_PRINT("Restoring regulatory settings including user preference\n"); + user_alpha2[0] = '9'; + user_alpha2[1] = '7'; + + /* + * If we're ignoring user settings, we still need to + * check the module parameter to ensure we put things + * back as they were for a full restore. + */ + if (!is_world_regdom(ieee80211_regdom)) { + REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n", + ieee80211_regdom[0], ieee80211_regdom[1]); + alpha2[0] = ieee80211_regdom[0]; + alpha2[1] = ieee80211_regdom[1]; + } + } else { + REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n", + user_alpha2[0], user_alpha2[1]); + alpha2[0] = user_alpha2[0]; + alpha2[1] = user_alpha2[1]; + } + } else if (!is_world_regdom(ieee80211_regdom)) { + REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n", + ieee80211_regdom[0], ieee80211_regdom[1]); + alpha2[0] = ieee80211_regdom[0]; + alpha2[1] = ieee80211_regdom[1]; + } else + REG_DBG_PRINT("Restoring regulatory settings\n"); +} + +static void restore_custom_reg_settings(struct wiphy *wiphy) +{ + struct ieee80211_supported_band *sband; + enum ieee80211_band band; + struct ieee80211_channel *chan; + int i; + + for (band = 0; band < IEEE80211_NUM_BANDS; band++) { + sband = wiphy->bands[band]; + if (!sband) + continue; + for (i = 0; i < sband->n_channels; i++) { + chan = &sband->channels[i]; + chan->flags = chan->orig_flags; + chan->max_antenna_gain = chan->orig_mag; + chan->max_power = chan->orig_mpwr; + chan->beacon_found = false; + } + } +} + +/* + * Restoring regulatory settings involves ingoring any + * possibly stale country IE information and user regulatory + * settings if so desired, this includes any beacon hints + * learned as we could have traveled outside to another country + * after disconnection. To restore regulatory settings we do + * exactly what we did at bootup: + * + * - send a core regulatory hint + * - send a user regulatory hint if applicable + * + * Device drivers that send a regulatory hint for a specific country + * keep their own regulatory domain on wiphy->regd so that does does + * not need to be remembered. + */ +static void restore_regulatory_settings(bool reset_user) +{ + char alpha2[2]; + char world_alpha2[2]; + struct reg_beacon *reg_beacon, *btmp; + struct regulatory_request *reg_request, *tmp; + LIST_HEAD(tmp_reg_req_list); + struct cfg80211_registered_device *rdev; + + mutex_lock(&cfg80211_mutex); + mutex_lock(®_mutex); + + reset_regdomains(true, &world_regdom); + restore_alpha2(alpha2, reset_user); + + /* + * If there's any pending requests we simply + * stash them to a temporary pending queue and + * add then after we've restored regulatory + * settings. + */ + spin_lock(®_requests_lock); + list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) { + if (reg_request->initiator != NL80211_REGDOM_SET_BY_USER) + continue; + list_move_tail(®_request->list, &tmp_reg_req_list); + } + spin_unlock(®_requests_lock); + + /* Clear beacon hints */ + spin_lock_bh(®_pending_beacons_lock); + list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { + list_del(®_beacon->list); + kfree(reg_beacon); + } + spin_unlock_bh(®_pending_beacons_lock); + + list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { + list_del(®_beacon->list); + kfree(reg_beacon); + } + + /* First restore to the basic regulatory settings */ + world_alpha2[0] = cfg80211_world_regdom->alpha2[0]; + world_alpha2[1] = cfg80211_world_regdom->alpha2[1]; + + list_for_each_entry(rdev, &cfg80211_rdev_list, list) { + if (rdev->wiphy.flags & WIPHY_FLAG_CUSTOM_REGULATORY) + restore_custom_reg_settings(&rdev->wiphy); + } + + regulatory_hint_core(world_alpha2); + + /* + * This restores the ieee80211_regdom module parameter + * preference or the last user requested regulatory + * settings, user regulatory settings takes precedence. + */ + if (is_an_alpha2(alpha2)) + regulatory_hint_user(user_alpha2, NL80211_USER_REG_HINT_USER); + + spin_lock(®_requests_lock); + list_splice_tail_init(&tmp_reg_req_list, ®_requests_list); + spin_unlock(®_requests_lock); + + mutex_unlock(®_mutex); + mutex_unlock(&cfg80211_mutex); + + REG_DBG_PRINT("Kicking the queue\n"); + + schedule_work(®_work); +} + +void regulatory_hint_disconnect(void) +{ + REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n"); + restore_regulatory_settings(false); +} + +static bool freq_is_chan_12_13_14(u16 freq) +{ + if (freq == ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ) || + freq == ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ) || + freq == ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ)) + return true; + return false; +} + +static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan) +{ + struct reg_beacon *pending_beacon; + + list_for_each_entry(pending_beacon, ®_pending_beacons, list) + if (beacon_chan->center_freq == + pending_beacon->chan.center_freq) + return true; + return false; +} + +int regulatory_hint_found_beacon(struct wiphy *wiphy, + struct ieee80211_channel *beacon_chan, + gfp_t gfp) +{ + struct reg_beacon *reg_beacon; + bool processing; + + if (beacon_chan->beacon_found || + beacon_chan->flags & IEEE80211_CHAN_RADAR || + (beacon_chan->band == IEEE80211_BAND_2GHZ && + !freq_is_chan_12_13_14(beacon_chan->center_freq))) + return 0; + + spin_lock_bh(®_pending_beacons_lock); + processing = pending_reg_beacon(beacon_chan); + spin_unlock_bh(®_pending_beacons_lock); + + if (processing) + return 0; + + reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp); + if (!reg_beacon) + return -ENOMEM; + + REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n", + beacon_chan->center_freq, + ieee80211_frequency_to_channel(beacon_chan->center_freq), + wiphy_name(wiphy)); + + memcpy(®_beacon->chan, beacon_chan, + sizeof(struct ieee80211_channel)); + + /* + * Since we can be called from BH or and non-BH context + * we must use spin_lock_bh() + */ + spin_lock_bh(®_pending_beacons_lock); + list_add_tail(®_beacon->list, ®_pending_beacons); + spin_unlock_bh(®_pending_beacons_lock); + + schedule_work(®_work); + + return 0; +} + +static void print_rd_rules(const struct ieee80211_regdomain *rd) +{ + unsigned int i; + const struct ieee80211_reg_rule *reg_rule = NULL; + const struct ieee80211_freq_range *freq_range = NULL; + const struct ieee80211_power_rule *power_rule = NULL; + + pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n"); + + for (i = 0; i < rd->n_reg_rules; i++) { + reg_rule = &rd->reg_rules[i]; + freq_range = ®_rule->freq_range; + power_rule = ®_rule->power_rule; + + /* + * There may not be documentation for max antenna gain + * in certain regions + */ + if (power_rule->max_antenna_gain) + pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n", + freq_range->start_freq_khz, + freq_range->end_freq_khz, + freq_range->max_bandwidth_khz, + power_rule->max_antenna_gain, + power_rule->max_eirp); + else + pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n", + freq_range->start_freq_khz, + freq_range->end_freq_khz, + freq_range->max_bandwidth_khz, + power_rule->max_eirp); + } +} + +bool reg_supported_dfs_region(u8 dfs_region) +{ + switch (dfs_region) { + case NL80211_DFS_UNSET: + case NL80211_DFS_FCC: + case NL80211_DFS_ETSI: + case NL80211_DFS_JP: + return true; + default: + REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n", + dfs_region); + return false; + } +} + +static void print_dfs_region(u8 dfs_region) +{ + if (!dfs_region) + return; + + switch (dfs_region) { + case NL80211_DFS_FCC: + pr_info(" DFS Master region FCC"); + break; + case NL80211_DFS_ETSI: + pr_info(" DFS Master region ETSI"); + break; + case NL80211_DFS_JP: + pr_info(" DFS Master region JP"); + break; + default: + pr_info(" DFS Master region Unknown"); + break; + } +} + +static void print_regdomain(const struct ieee80211_regdomain *rd) +{ + struct regulatory_request *lr = get_last_request(); + + if (is_intersected_alpha2(rd->alpha2)) { + if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) { + struct cfg80211_registered_device *rdev; + rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx); + if (rdev) { + pr_info("Current regulatory domain updated by AP to: %c%c\n", + rdev->country_ie_alpha2[0], + rdev->country_ie_alpha2[1]); + } else + pr_info("Current regulatory domain intersected:\n"); + } else + pr_info("Current regulatory domain intersected:\n"); + } else if (is_world_regdom(rd->alpha2)) { + pr_info("World regulatory domain updated:\n"); + } else { + if (is_unknown_alpha2(rd->alpha2)) + pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n"); + else { + if (reg_request_cell_base(lr)) + pr_info("Regulatory domain changed to country: %c%c by Cell Station\n", + rd->alpha2[0], rd->alpha2[1]); + else + pr_info("Regulatory domain changed to country: %c%c\n", + rd->alpha2[0], rd->alpha2[1]); + } + } + + print_dfs_region(rd->dfs_region); + print_rd_rules(rd); +} + +static void print_regdomain_info(const struct ieee80211_regdomain *rd) +{ + pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]); + print_rd_rules(rd); +} + +/* Takes ownership of rd only if it doesn't fail */ +static int __set_regdom(const struct ieee80211_regdomain *rd) +{ + const struct ieee80211_regdomain *regd; + const struct ieee80211_regdomain *intersected_rd = NULL; + struct wiphy *request_wiphy; + struct regulatory_request *lr = get_last_request(); + + /* Some basic sanity checks first */ + + if (!reg_is_valid_request(rd->alpha2)) + return -EINVAL; + + if (is_world_regdom(rd->alpha2)) { + update_world_regdomain(rd); + return 0; + } + + if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) && + !is_unknown_alpha2(rd->alpha2)) + return -EINVAL; + + /* + * Lets only bother proceeding on the same alpha2 if the current + * rd is non static (it means CRDA was present and was used last) + * and the pending request came in from a country IE + */ + if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { + /* + * If someone else asked us to change the rd lets only bother + * checking if the alpha2 changes if CRDA was already called + */ + if (!regdom_changes(rd->alpha2)) + return -EALREADY; + } + + /* + * Now lets set the regulatory domain, update all driver channels + * and finally inform them of what we have done, in case they want + * to review or adjust their own settings based on their own + * internal EEPROM data + */ + + if (!is_valid_rd(rd)) { + pr_err("Invalid regulatory domain detected:\n"); + print_regdomain_info(rd); + return -EINVAL; + } + + request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); + if (!request_wiphy && + (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER || + lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)) { + schedule_delayed_work(®_timeout, 0); + return -ENODEV; + } + + if (!lr->intersect) { + if (lr->initiator != NL80211_REGDOM_SET_BY_DRIVER) { + reset_regdomains(false, rd); + return 0; + } + + /* + * For a driver hint, lets copy the regulatory domain the + * driver wanted to the wiphy to deal with conflicts + */ + + /* + * Userspace could have sent two replies with only + * one kernel request. + */ + if (request_wiphy->regd) + return -EALREADY; + + regd = reg_copy_regd(rd); + if (IS_ERR(regd)) + return PTR_ERR(regd); + + rcu_assign_pointer(request_wiphy->regd, regd); + reset_regdomains(false, rd); + return 0; + } + + /* Intersection requires a bit more work */ + + if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { + intersected_rd = regdom_intersect(rd, get_cfg80211_regdom()); + if (!intersected_rd) + return -EINVAL; + + /* + * We can trash what CRDA provided now. + * However if a driver requested this specific regulatory + * domain we keep it for its private use + */ + if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER) { + const struct ieee80211_regdomain *tmp; + + tmp = get_wiphy_regdom(request_wiphy); + rcu_assign_pointer(request_wiphy->regd, rd); + rcu_free_regdom(tmp); + } else { + kfree(rd); + } + + rd = NULL; + + reset_regdomains(false, intersected_rd); + + return 0; + } + + return -EINVAL; +} + + +/* + * Use this call to set the current regulatory domain. Conflicts with + * multiple drivers can be ironed out later. Caller must've already + * kmalloc'd the rd structure. + */ +int set_regdom(const struct ieee80211_regdomain *rd) +{ + struct regulatory_request *lr; + int r; + + mutex_lock(®_mutex); + lr = get_last_request(); + + /* Note that this doesn't update the wiphys, this is done below */ + r = __set_regdom(rd); + if (r) { + if (r == -EALREADY) + reg_set_request_processed(); + + kfree(rd); + goto out; + } + + /* This would make this whole thing pointless */ + if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom())) { + r = -EINVAL; + goto out; + } + + /* update all wiphys now with the new established regulatory domain */ + update_all_wiphy_regulatory(lr->initiator); + + print_regdomain(get_cfg80211_regdom()); + + nl80211_send_reg_change_event(lr); + + reg_set_request_processed(); + + out: + mutex_unlock(®_mutex); + + return r; +} + +int reg_device_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct regulatory_request *lr; + u8 alpha2[2]; + bool add = false; + + rcu_read_lock(); + lr = get_last_request(); + if (lr && !lr->processed) { + memcpy(alpha2, lr->alpha2, 2); + add = true; + } + rcu_read_unlock(); + + if (add) + return add_uevent_var(env, "COUNTRY=%c%c", + alpha2[0], alpha2[1]); + return 0; +} + +void wiphy_regulatory_register(struct wiphy *wiphy) +{ + mutex_lock(®_mutex); + + if (!reg_dev_ignore_cell_hint(wiphy)) + reg_num_devs_support_basehint++; + + wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); + + mutex_unlock(®_mutex); +} + +/* Caller must hold cfg80211_mutex */ +void wiphy_regulatory_deregister(struct wiphy *wiphy) +{ + struct wiphy *request_wiphy = NULL; + struct regulatory_request *lr; + + mutex_lock(®_mutex); + lr = get_last_request(); + + if (!reg_dev_ignore_cell_hint(wiphy)) + reg_num_devs_support_basehint--; + + rcu_free_regdom(get_wiphy_regdom(wiphy)); + rcu_assign_pointer(wiphy->regd, NULL); + + if (lr) + request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx); + + if (!request_wiphy || request_wiphy != wiphy) + goto out; + + lr->wiphy_idx = WIPHY_IDX_INVALID; + lr->country_ie_env = ENVIRON_ANY; +out: + mutex_unlock(®_mutex); +} + +static void reg_timeout_work(struct work_struct *work) +{ + REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n"); + restore_regulatory_settings(true); +} + +int __init regulatory_init(void) +{ + int err = 0; + + reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0); + if (IS_ERR(reg_pdev)) + return PTR_ERR(reg_pdev); + + reg_pdev->dev.type = ®_device_type; + + spin_lock_init(®_requests_lock); + spin_lock_init(®_pending_beacons_lock); + + reg_regdb_size_check(); + + rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom); + + user_alpha2[0] = '9'; + user_alpha2[1] = '7'; + + /* We always try to get an update for the static regdomain */ + err = regulatory_hint_core(cfg80211_world_regdom->alpha2); + if (err) { + if (err == -ENOMEM) + return err; + /* + * N.B. kobject_uevent_env() can fail mainly for when we're out + * memory which is handled and propagated appropriately above + * but it can also fail during a netlink_broadcast() or during + * early boot for call_usermodehelper(). For now treat these + * errors as non-fatal. + */ + pr_err("kobject_uevent_env() was unable to call CRDA during init\n"); + } + + /* + * Finally, if the user set the module parameter treat it + * as a user hint. + */ + if (!is_world_regdom(ieee80211_regdom)) + regulatory_hint_user(ieee80211_regdom, + NL80211_USER_REG_HINT_USER); + + return 0; +} + +void regulatory_exit(void) +{ + struct regulatory_request *reg_request, *tmp; + struct reg_beacon *reg_beacon, *btmp; + + cancel_work_sync(®_work); + cancel_delayed_work_sync(®_timeout); + + /* Lock to suppress warnings */ + mutex_lock(®_mutex); + reset_regdomains(true, NULL); + mutex_unlock(®_mutex); + + dev_set_uevent_suppress(®_pdev->dev, true); + + platform_device_unregister(reg_pdev); + + list_for_each_entry_safe(reg_beacon, btmp, ®_pending_beacons, list) { + list_del(®_beacon->list); + kfree(reg_beacon); + } + + list_for_each_entry_safe(reg_beacon, btmp, ®_beacon_list, list) { + list_del(®_beacon->list); + kfree(reg_beacon); + } + + list_for_each_entry_safe(reg_request, tmp, ®_requests_list, list) { + list_del(®_request->list); + kfree(reg_request); + } +} |