diff options
Diffstat (limited to 'net/wireless_ath/reg.c')
-rwxr-xr-x | net/wireless_ath/reg.c | 2307 |
1 files changed, 0 insertions, 2307 deletions
diff --git a/net/wireless_ath/reg.c b/net/wireless_ath/reg.c deleted file mode 100755 index a797919..0000000 --- a/net/wireless_ath/reg.c +++ /dev/null @@ -1,2307 +0,0 @@ -/* - * Copyright 2002-2005, Instant802 Networks, Inc. - * Copyright 2005-2006, Devicescape Software, Inc. - * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> - * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -/** - * 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 - -/* Receipt of information from last regulatory request */ -static struct regulatory_request *last_request; - -/* 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(®_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(void) -{ - /* 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; -} - -/* - * 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(); - - 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(®d->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(®_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 (!memcmp(request->alpha2, curdom->alpha2, 2)) { - r = reg_copy_regd(®dom, curdom); - if (r) - break; - mutex_lock(&cfg80211_mutex); - set_regdom(regdom); - mutex_unlock(&cfg80211_mutex); - break; - } - } - - kfree(request); - } - mutex_unlock(®_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(®_regdb_search_mutex); - list_add_tail(&request->list, ®_regdb_search_list); - mutex_unlock(®_regdb_search_mutex); - - schedule_work(®_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(®_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 = ®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, - 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 = ®_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 " - "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, - ®_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 = ®_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 (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) - 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(®_beacon_list)) - return; - - 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); - } -} - -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; - - for (band = 0; band < IEEE80211_NUM_BANDS; band++) { - if (wiphy->bands[band]) - handle_band(wiphy, band, initiator); - } - -#ifdef CONFIG_MACH_PX - last_request->processed = true; -#endif - - 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(®_mutex); - wiphy_update_regulatory(wiphy, setby); - mutex_unlock(®_mutex); -} - -static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator) -{ - struct cfg80211_registered_device *rdev; - - list_for_each_entry(rdev, &cfg80211_rdev_list, list) - wiphy_update_regulatory(&rdev->wiphy, initiator); -} - -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, - ®_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 = ®_rule->power_rule; - freq_range = ®_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(®_mutex); - for (band = 0; band < IEEE80211_NUM_BANDS; band++) { - if (!wiphy->bands[band]) - continue; - handle_band_custom(wiphy, band, regd); - bands_set++; - } - mutex_unlock(®_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(®_requests_lock); - if (!list_empty(®_requests_list)) - need_more_processing = true; - spin_unlock(®_requests_lock); - - if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) - cancel_delayed_work_sync(®_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 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 ®_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: - 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) -{ - int r = 0; - struct wiphy *wiphy = NULL; - enum nl80211_reg_initiator initiator = reg_request->initiator; - - BUG_ON(!reg_request->alpha2); - - if (wiphy_idx_valid(reg_request->wiphy_idx)) - wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx); - - if (reg_request->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, initiator); - return; - } - - /* - * We only time out user hints, given that they should be the only - * source of bogus requests. - */ - if (r != -EALREADY && - reg_request->initiator == NL80211_REGDOM_SET_BY_USER) - schedule_delayed_work(®_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(®_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(®_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); - -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; - - /* - * 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(®_pending_beacons_lock); - - if (list_empty(®_pending_beacons)) { - spin_unlock_bh(®_pending_beacons_lock); - goto out; - } - - 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); -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(®_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; - - kfree(last_request); - last_request = NULL; - - 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(®_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(®_mutex); - - queue_regulatory_request(request); - - return; - -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"); -} - -/* - * 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]; - struct reg_beacon *reg_beacon, *btmp; - struct regulatory_request *reg_request, *tmp; - LIST_HEAD(tmp_reg_req_list); - - mutex_lock(&cfg80211_mutex); - mutex_lock(®_mutex); - - reset_regdomains(); - 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); - if (!list_empty(®_requests_list)) { - list_for_each_entry_safe(reg_request, tmp, - ®_requests_list, list) { - if (reg_request->initiator != - NL80211_REGDOM_SET_BY_USER) - continue; - list_del(®_request->list); - list_add_tail(®_request->list, &tmp_reg_req_list); - } - } - spin_unlock(®_requests_lock); - - /* Clear beacon hints */ - spin_lock_bh(®_pending_beacons_lock); - if (!list_empty(®_pending_beacons)) { - list_for_each_entry_safe(reg_beacon, btmp, - ®_pending_beacons, list) { - list_del(®_beacon->list); - kfree(reg_beacon); - } - } - spin_unlock_bh(®_pending_beacons_lock); - - if (!list_empty(®_beacon_list)) { - 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 */ - cfg80211_regdomain = cfg80211_world_regdom; - - mutex_unlock(®_mutex); - mutex_unlock(&cfg80211_mutex); - - regulatory_hint_core(cfg80211_regdomain->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(®_mutex); - - spin_lock(®_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(®_request->list); - list_add_tail(®_request->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; -} - -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(®_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); - } -} - -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_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 (!last_request->intersect) { - int r; - - if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) { - reset_regdomains(); - 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(); - 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(); - 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(); - 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(®_mutex); - - /* Note that this doesn't update the wiphys, this is done below */ - r = __set_regdom(rd); - if (r) { - kfree(rd); - mutex_unlock(®_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(®_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(®_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(®_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); - - 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(®_work); - cancel_delayed_work_sync(®_timeout); - - mutex_lock(&cfg80211_mutex); - mutex_lock(®_mutex); - - reset_regdomains(); - - kfree(last_request); - - last_request = NULL; - dev_set_uevent_suppress(®_pdev->dev, true); - - platform_device_unregister(reg_pdev); - - spin_lock_bh(®_pending_beacons_lock); - if (!list_empty(®_pending_beacons)) { - list_for_each_entry_safe(reg_beacon, btmp, - ®_pending_beacons, list) { - list_del(®_beacon->list); - kfree(reg_beacon); - } - } - spin_unlock_bh(®_pending_beacons_lock); - - if (!list_empty(®_beacon_list)) { - list_for_each_entry_safe(reg_beacon, btmp, - ®_beacon_list, list) { - list_del(®_beacon->list); - kfree(reg_beacon); - } - } - - spin_lock(®_requests_lock); - if (!list_empty(®_requests_list)) { - list_for_each_entry_safe(reg_request, tmp, - ®_requests_list, list) { - list_del(®_request->list); - kfree(reg_request); - } - } - spin_unlock(®_requests_lock); - - mutex_unlock(®_mutex); - mutex_unlock(&cfg80211_mutex); -} |