* 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.
*/
-/*
- * This regulatory domain control implementation is highly incomplete, it
- * only exists for the purpose of not regressing mac80211.
- *
- * For now, drivers can restrict the set of allowed channels by either
- * not registering those channels or setting the IEEE80211_CHAN_DISABLED
- * flag; that flag will only be *set* by this code, never *cleared.
+/**
+ * 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.
*
- * Alternatively, drivers that trust the regulatory domain control here
- * will register a complete set of capabilities and the control code
- * will restrict the set by setting the IEEE80211_CHAN_* flags.
+ * 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.
+ *
*/
#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/random.h>
+#include <linux/nl80211.h>
+#include <linux/platform_device.h>
#include <net/wireless.h>
+#include <net/cfg80211.h>
#include "core.h"
+#include "reg.h"
-static char *ieee80211_regdom = "US";
-module_param(ieee80211_regdom, charp, 0444);
-MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
+/**
+ * struct regulatory_request - receipt of last regulatory request
+ *
+ * @wiphy: this is set if this request's initiator is
+ * %REGDOM_SET_BY_COUNTRY_IE or %REGDOM_SET_BY_DRIVER. This
+ * can be used by the wireless core to deal with conflicts
+ * and potentially inform users of which devices specifically
+ * cased the conflicts.
+ * @initiator: indicates who sent this request, could be any of
+ * of those set in reg_set_by, %REGDOM_SET_BY_*
+ * @alpha2: the ISO / IEC 3166 alpha2 country code of the requested
+ * regulatory domain. We have a few special codes:
+ * 00 - World regulatory domain
+ * 99 - built by driver but a specific alpha2 cannot be determined
+ * 98 - result of an intersection between two regulatory domains
+ * @intersect: indicates whether the wireless core should intersect
+ * the requested regulatory domain with the presently set regulatory
+ * domain.
+ */
+struct regulatory_request {
+ struct wiphy *wiphy;
+ enum reg_set_by initiator;
+ char alpha2[2];
+ bool intersect;
+};
+
+/* Receipt of information from last regulatory request */
+static struct regulatory_request *last_request;
-struct ieee80211_channel_range {
- short start_freq;
- short end_freq;
- int max_power;
- int max_antenna_gain;
- u32 flags;
+/* To trigger userspace events */
+static struct platform_device *reg_pdev;
+
+/* Keep the ordering from large to small */
+static u32 supported_bandwidths[] = {
+ MHZ_TO_KHZ(40),
+ MHZ_TO_KHZ(20),
};
-struct ieee80211_regdomain {
- const char *code;
- const struct ieee80211_channel_range *ranges;
- int n_ranges;
+/* 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 */
+static const struct ieee80211_regdomain *cfg80211_regdomain;
+
+/* We keep a static world regulatory domain in case of the absence of CRDA */
+static const struct ieee80211_regdomain world_regdom = {
+ .n_reg_rules = 1,
+ .alpha2 = "00",
+ .reg_rules = {
+ REG_RULE(2412-10, 2462+10, 40, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS),
+ }
};
-#define RANGE_PWR(_start, _end, _pwr, _ag, _flags) \
- { _start, _end, _pwr, _ag, _flags }
+static const struct ieee80211_regdomain *cfg80211_world_regdom =
+ &world_regdom;
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+static char *ieee80211_regdom = "US";
+module_param(ieee80211_regdom, charp, 0444);
+MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
-/*
- * Ideally, in the future, these definitions will be loaded from a
- * userspace table via some daemon.
- */
-static const struct ieee80211_channel_range ieee80211_US_channels[] = {
- /* IEEE 802.11b/g, channels 1..11 */
- RANGE_PWR(2412, 2462, 27, 6, 0),
- /* IEEE 802.11a, channel 36*/
- RANGE_PWR(5180, 5180, 23, 6, 0),
- /* IEEE 802.11a, channel 40*/
- RANGE_PWR(5200, 5200, 23, 6, 0),
- /* IEEE 802.11a, channel 44*/
- RANGE_PWR(5220, 5220, 23, 6, 0),
- /* IEEE 802.11a, channels 48..64 */
- RANGE_PWR(5240, 5320, 23, 6, 0),
- /* IEEE 802.11a, channels 149..165, outdoor */
- RANGE_PWR(5745, 5825, 30, 6, 0),
-};
+/* We assume 40 MHz bandwidth for the old regulatory work.
+ * We make emphasis we are using the exact same frequencies
+ * as before */
-static const struct ieee80211_channel_range ieee80211_JP_channels[] = {
- /* IEEE 802.11b/g, channels 1..14 */
- RANGE_PWR(2412, 2484, 20, 6, 0),
- /* IEEE 802.11a, channels 34..48 */
- RANGE_PWR(5170, 5240, 20, 6, IEEE80211_CHAN_PASSIVE_SCAN),
- /* IEEE 802.11a, channels 52..64 */
- RANGE_PWR(5260, 5320, 20, 6, IEEE80211_CHAN_NO_IBSS |
- IEEE80211_CHAN_RADAR),
+static const struct ieee80211_regdomain us_regdom = {
+ .n_reg_rules = 6,
+ .alpha2 = "US",
+ .reg_rules = {
+ /* IEEE 802.11b/g, channels 1..11 */
+ REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
+ /* IEEE 802.11a, channel 36 */
+ REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
+ /* IEEE 802.11a, channel 40 */
+ REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
+ /* IEEE 802.11a, channel 44 */
+ REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
+ /* IEEE 802.11a, channels 48..64 */
+ REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
+ /* IEEE 802.11a, channels 149..165, outdoor */
+ REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
+ }
};
-static const struct ieee80211_channel_range ieee80211_EU_channels[] = {
- /* IEEE 802.11b/g, channels 1..13 */
- RANGE_PWR(2412, 2472, 20, 6, 0),
- /* IEEE 802.11a, channel 36*/
- RANGE_PWR(5180, 5180, 23, 6, IEEE80211_CHAN_PASSIVE_SCAN),
- /* IEEE 802.11a, channel 40*/
- RANGE_PWR(5200, 5200, 23, 6, IEEE80211_CHAN_PASSIVE_SCAN),
- /* IEEE 802.11a, channel 44*/
- RANGE_PWR(5220, 5220, 23, 6, IEEE80211_CHAN_PASSIVE_SCAN),
- /* IEEE 802.11a, channels 48..64 */
- RANGE_PWR(5240, 5320, 23, 6, IEEE80211_CHAN_NO_IBSS |
- IEEE80211_CHAN_RADAR),
- /* IEEE 802.11a, channels 100..140 */
- RANGE_PWR(5500, 5700, 30, 6, IEEE80211_CHAN_NO_IBSS |
- IEEE80211_CHAN_RADAR),
+static const struct ieee80211_regdomain jp_regdom = {
+ .n_reg_rules = 3,
+ .alpha2 = "JP",
+ .reg_rules = {
+ /* IEEE 802.11b/g, channels 1..14 */
+ REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
+ /* IEEE 802.11a, channels 34..48 */
+ REG_RULE(5170-10, 5240+10, 40, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN),
+ /* IEEE 802.11a, channels 52..64 */
+ REG_RULE(5260-10, 5320+10, 40, 6, 20,
+ NL80211_RRF_NO_IBSS |
+ NL80211_RRF_DFS),
+ }
};
-#define REGDOM(_code) \
- { \
- .code = __stringify(_code), \
- .ranges = ieee80211_ ##_code## _channels, \
- .n_ranges = ARRAY_SIZE(ieee80211_ ##_code## _channels), \
+static const struct ieee80211_regdomain eu_regdom = {
+ .n_reg_rules = 6,
+ /* This alpha2 is bogus, we leave it here just for stupid
+ * backward compatibility */
+ .alpha2 = "EU",
+ .reg_rules = {
+ /* IEEE 802.11b/g, channels 1..13 */
+ REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
+ /* IEEE 802.11a, channel 36 */
+ REG_RULE(5180-10, 5180+10, 40, 6, 23,
+ NL80211_RRF_PASSIVE_SCAN),
+ /* IEEE 802.11a, channel 40 */
+ REG_RULE(5200-10, 5200+10, 40, 6, 23,
+ NL80211_RRF_PASSIVE_SCAN),
+ /* IEEE 802.11a, channel 44 */
+ REG_RULE(5220-10, 5220+10, 40, 6, 23,
+ NL80211_RRF_PASSIVE_SCAN),
+ /* IEEE 802.11a, channels 48..64 */
+ REG_RULE(5240-10, 5320+10, 40, 6, 20,
+ NL80211_RRF_NO_IBSS |
+ NL80211_RRF_DFS),
+ /* IEEE 802.11a, channels 100..140 */
+ REG_RULE(5500-10, 5700+10, 40, 6, 30,
+ NL80211_RRF_NO_IBSS |
+ NL80211_RRF_DFS),
}
-
-static const struct ieee80211_regdomain ieee80211_regdoms[] = {
- REGDOM(US),
- REGDOM(JP),
- REGDOM(EU),
};
+static const struct ieee80211_regdomain *static_regdom(char *alpha2)
+{
+ if (alpha2[0] == 'U' && alpha2[1] == 'S')
+ return &us_regdom;
+ if (alpha2[0] == 'J' && alpha2[1] == 'P')
+ return &jp_regdom;
+ if (alpha2[0] == 'E' && alpha2[1] == 'U')
+ return &eu_regdom;
+ /* Default, as per the old rules */
+ return &us_regdom;
+}
-static const struct ieee80211_regdomain *get_regdom(void)
+static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
{
- static const struct ieee80211_channel_range
- ieee80211_world_channels[] = {
- /* IEEE 802.11b/g, channels 1..11 */
- RANGE_PWR(2412, 2462, 27, 6, 0),
+ if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
+ return true;
+ return false;
+}
+#else
+static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
+{
+ return false;
+}
+#endif
+
+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;
+ if (is_old_static_regdom(cfg80211_regdomain))
+ 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_alpha_upper(char letter)
+{
+ /* ASCII A - Z */
+ if (letter >= 65 && letter <= 90)
+ 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_an_alpha2(const char *alpha2)
+{
+ if (!alpha2)
+ return false;
+ if (is_alpha_upper(alpha2[0]) && is_alpha_upper(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_changed(const char *alpha2)
+{
+ if (!cfg80211_regdomain)
+ return true;
+ if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ return false;
+ return true;
+}
+
+/* This lets us keep regulatory code which is updated on a regulatory
+ * basis in userspace. */
+static int call_crda(const char *alpha2)
+{
+ char country_env[9 + 2] = "COUNTRY=";
+ char *envp[] = {
+ country_env,
+ NULL
};
- static const struct ieee80211_regdomain regdom_world = REGDOM(world);
- int i;
- for (i = 0; i < ARRAY_SIZE(ieee80211_regdoms); i++)
- if (strcmp(ieee80211_regdom, ieee80211_regdoms[i].code) == 0)
- return &ieee80211_regdoms[i];
+ if (!is_world_regdom((char *) alpha2))
+ printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
+ alpha2[0], alpha2[1]);
+ else
+ printk(KERN_INFO "cfg80211: Calling CRDA to update world "
+ "regulatory domain\n");
+
+ country_env[8] = alpha2[0];
+ country_env[9] = alpha2[1];
+
+ return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
+}
+
+/* Used by nl80211 before kmalloc'ing our regulatory domain */
+bool reg_is_valid_request(const char *alpha2)
+{
+ 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_diff <= 0 || 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;
+
+ 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;
+}
+
+/* Returns value in KHz */
+static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
+ u32 freq)
+{
+ unsigned int i;
+ for (i = 0; i < ARRAY_SIZE(supported_bandwidths); i++) {
+ u32 start_freq_khz = freq - supported_bandwidths[i]/2;
+ u32 end_freq_khz = freq + supported_bandwidths[i]/2;
+ if (start_freq_khz >= freq_range->start_freq_khz &&
+ end_freq_khz <= freq_range->end_freq_khz)
+ return supported_bandwidths[i];
+ }
+ return 0;
+}
+
+/* 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;
+ }
- return ®dom_world;
+ 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 void handle_channel(struct ieee80211_channel *chan,
- const struct ieee80211_regdomain *rd)
+/**
+ * freq_reg_info - get regulatory information for the given frequency
+ * @center_freq: Frequency in KHz for which we want regulatory information for
+ * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
+ * you can set this to 0. If this frequency is allowed we then set
+ * this value to the maximum allowed bandwidth.
+ * @reg_rule: the regulatory rule which we have for this frequency
+ *
+ * Use this function to get the regulatory rule for a specific frequency.
+ */
+static int freq_reg_info(u32 center_freq, u32 *bandwidth,
+ const struct ieee80211_reg_rule **reg_rule)
{
int i;
- u32 flags = chan->orig_flags;
- const struct ieee80211_channel_range *rg = NULL;
+ u32 max_bandwidth = 0;
+
+ if (!cfg80211_regdomain)
+ return -EINVAL;
- for (i = 0; i < rd->n_ranges; i++) {
- if (rd->ranges[i].start_freq <= chan->center_freq &&
- chan->center_freq <= rd->ranges[i].end_freq) {
- rg = &rd->ranges[i];
+ for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
+ const struct ieee80211_reg_rule *rr;
+ const struct ieee80211_freq_range *fr = NULL;
+ const struct ieee80211_power_rule *pr = NULL;
+
+ rr = &cfg80211_regdomain->reg_rules[i];
+ fr = &rr->freq_range;
+ pr = &rr->power_rule;
+ max_bandwidth = freq_max_bandwidth(fr, center_freq);
+ if (max_bandwidth && *bandwidth <= max_bandwidth) {
+ *reg_rule = rr;
+ *bandwidth = max_bandwidth;
break;
}
}
- if (!rg) {
- /* not found */
+ return !max_bandwidth;
+}
+
+static void handle_channel(struct ieee80211_channel *chan)
+{
+ int r;
+ u32 flags = chan->orig_flags;
+ u32 max_bandwidth = 0;
+ const struct ieee80211_reg_rule *reg_rule = NULL;
+ const struct ieee80211_power_rule *power_rule = NULL;
+
+ r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
+ &max_bandwidth, ®_rule);
+
+ if (r) {
flags |= IEEE80211_CHAN_DISABLED;
chan->flags = flags;
return;
}
- chan->flags = flags;
+ power_rule = ®_rule->power_rule;
+
+ chan->flags = flags | map_regdom_flags(reg_rule->flags);
chan->max_antenna_gain = min(chan->orig_mag,
- rg->max_antenna_gain);
+ (int) MBI_TO_DBI(power_rule->max_antenna_gain));
+ chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
if (chan->orig_mpwr)
- chan->max_power = min(chan->orig_mpwr, rg->max_power);
+ chan->max_power = min(chan->orig_mpwr,
+ (int) MBM_TO_DBM(power_rule->max_eirp));
else
- chan->max_power = rg->max_power;
+ chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
}
-static void handle_band(struct ieee80211_supported_band *sband,
- const struct ieee80211_regdomain *rd)
+static void handle_band(struct ieee80211_supported_band *sband)
{
int i;
for (i = 0; i < sband->n_channels; i++)
- handle_channel(&sband->channels[i], rd);
+ handle_channel(&sband->channels[i]);
}
-void wiphy_update_regulatory(struct wiphy *wiphy)
+static void update_all_wiphy_regulatory(enum reg_set_by setby)
{
- enum ieee80211_band band;
- const struct ieee80211_regdomain *rd = get_regdom();
+ struct cfg80211_registered_device *drv;
+
+ list_for_each_entry(drv, &cfg80211_drv_list, list)
+ wiphy_update_regulatory(&drv->wiphy, setby);
+}
- for (band = 0; band < IEEE80211_NUM_BANDS; band++)
+void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
+{
+ enum ieee80211_band band;
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (wiphy->bands[band])
- handle_band(wiphy->bands[band], rd);
+ handle_band(wiphy->bands[band]);
+ if (wiphy->reg_notifier)
+ wiphy->reg_notifier(wiphy, setby);
+ }
+}
+
+/* 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, enum reg_set_by set_by,
+ const char *alpha2)
+{
+ /* All initial requests are respected */
+ if (!last_request)
+ return 0;
+
+ switch (set_by) {
+ case REGDOM_SET_BY_INIT:
+ return -EINVAL;
+ case REGDOM_SET_BY_CORE:
+ /*
+ * Always respect new wireless core hints, should only happen
+ * when updating the world regulatory domain at init.
+ */
+ return 0;
+ case REGDOM_SET_BY_COUNTRY_IE:
+ if (unlikely(!is_an_alpha2(alpha2)))
+ return -EINVAL;
+ if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
+ if (last_request->wiphy != wiphy) {
+ /*
+ * Two cards with two APs claiming different
+ * different Country IE alpha2s. We could
+ * intersect them, but that seems unlikely
+ * to be correct. Reject second one for now.
+ */
+ if (!alpha2_equal(alpha2,
+ cfg80211_regdomain->alpha2))
+ return -EOPNOTSUPP;
+ return -EALREADY;
+ }
+ /* Two consecutive Country IE hints on the same wiphy */
+ if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ return 0;
+ return -EALREADY;
+ }
+ /*
+ * Ignore Country IE hints for now, need to think about
+ * what we need to do to support multi-domain operation.
+ */
+ return -EOPNOTSUPP;
+ case REGDOM_SET_BY_DRIVER:
+ if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+ return -EALREADY;
+ return 0;
+ case REGDOM_SET_BY_USER:
+ if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
+ return REG_INTERSECT;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/* Caller must hold &cfg80211_drv_mutex */
+int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
+ const char *alpha2)
+{
+ struct regulatory_request *request;
+ bool intersect = false;
+ int r = 0;
+
+ r = ignore_request(wiphy, set_by, alpha2);
+
+ if (r == REG_INTERSECT)
+ intersect = true;
+ else if (r)
+ return r;
+
+ request = kzalloc(sizeof(struct regulatory_request),
+ GFP_KERNEL);
+ if (!request)
+ return -ENOMEM;
+
+ request->alpha2[0] = alpha2[0];
+ request->alpha2[1] = alpha2[1];
+ request->initiator = set_by;
+ request->wiphy = wiphy;
+ request->intersect = intersect;
+
+ kfree(last_request);
+ last_request = request;
+ r = call_crda(alpha2);
+
+#ifndef CONFIG_WIRELESS_OLD_REGULATORY
+ if (r)
+ printk(KERN_ERR "cfg80211: Failed calling CRDA\n");
+#endif
+
+ return r;
+}
+
+void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
+{
+ BUG_ON(!alpha2);
+
+ mutex_lock(&cfg80211_drv_mutex);
+ __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2);
+ mutex_unlock(&cfg80211_drv_mutex);
+}
+EXPORT_SYMBOL(regulatory_hint);
+
+
+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;
+
+ printk(KERN_INFO "\t(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)
+ printk(KERN_INFO "\t(%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
+ printk(KERN_INFO "\t(%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_world_regdom(rd->alpha2))
+ printk(KERN_INFO "cfg80211: World regulatory "
+ "domain updated:\n");
+ else {
+ if (is_unknown_alpha2(rd->alpha2))
+ printk(KERN_INFO "cfg80211: Regulatory domain "
+ "changed to driver built-in settings "
+ "(unknown country)\n");
+ else
+ printk(KERN_INFO "cfg80211: 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)
+{
+ printk(KERN_INFO "cfg80211: 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;
+ /* 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;
+
+ /* allow overriding the static definitions if CRDA is present */
+ if (!is_old_static_regdom(cfg80211_regdomain) &&
+ !regdom_changed(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)) {
+ printk(KERN_ERR "cfg80211: Invalid "
+ "regulatory domain detected:\n");
+ print_regdomain_info(rd);
+ return -EINVAL;
+ }
+
+ if (!last_request->intersect) {
+ reset_regdomains();
+ cfg80211_regdomain = rd;
+ return 0;
+ }
+
+ /* Intersection requires a bit more work */
+
+ if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
+
+ intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
+ if (!intersected_rd)
+ return -EINVAL;
+
+ /* We can trash what CRDA provided now */
+ kfree(rd);
+ rd = NULL;
+
+ reset_regdomains();
+ cfg80211_regdomain = intersected_rd;
+
+ return 0;
+ }
+
+ /* Country IE parsing coming soon */
+ reset_regdomains();
+ WARN_ON(1);
+
+ 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_drv_mutex */
+int set_regdom(const struct ieee80211_regdomain *rd)
+{
+ int r;
+
+ /* Note that this doesn't update the wiphys, this is done below */
+ r = __set_regdom(rd);
+ if (r) {
+ kfree(rd);
+ return r;
+ }
+
+ /* This would make this whole thing pointless */
+ BUG_ON(rd != cfg80211_regdomain);
+
+ /* update all wiphys now with the new established regulatory domain */
+ update_all_wiphy_regulatory(last_request->initiator);
+
+ print_regdomain(rd);
+
+ return r;
+}
+
+int regulatory_init(void)
+{
+ int err;
+
+ reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
+ if (IS_ERR(reg_pdev))
+ return PTR_ERR(reg_pdev);
+
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+ cfg80211_regdomain = static_regdom(ieee80211_regdom);
+
+ printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
+ print_regdomain_info(cfg80211_regdomain);
+ /* The old code still requests for a new regdomain and if
+ * you have CRDA you get it updated, otherwise you get
+ * stuck with the static values. We ignore "EU" code as
+ * that is not a valid ISO / IEC 3166 alpha2 */
+ if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
+ err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
+ ieee80211_regdom);
+#else
+ cfg80211_regdomain = cfg80211_world_regdom;
+
+ err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00");
+ if (err)
+ printk(KERN_ERR "cfg80211: calling CRDA failed - "
+ "unable to update world regulatory domain, "
+ "using static definition\n");
+#endif
+
+ return 0;
+}
+
+void regulatory_exit(void)
+{
+ mutex_lock(&cfg80211_drv_mutex);
+
+ reset_regdomains();
+
+ kfree(last_request);
+
+ platform_device_unregister(reg_pdev);
+
+ mutex_unlock(&cfg80211_drv_mutex);
}
projects / linux-2.6-omap-h63xx.git / blobdiff