cfg80211: Add new wireless regulatory infrastructure

This adds the new wireless regulatory infrastructure. The
main motiviation behind this was to centralize regulatory
code as each driver was implementing their own regulatory solution,
and to replace the initial centralized code we have where:

* only 3 regulatory domains are supported: US, JP and EU
* regulatory domains can only be changed through module parameter
* all rules were built statically in the kernel

We now have support for regulatory domains for many countries
and regulatory domains are now queried through a userspace agent
through udev allowing distributions to update regulatory rules
without updating the kernel.

Each driver can regulatory_hint() a regulatory domain
based on either their EEPROM mapped regulatory domain value to a
respective ISO/IEC 3166-1 country code or pass an internally built
regulatory domain. We also add support to let the user set the
regulatory domain through userspace in case of faulty EEPROMs to
further help compliance.

Support for world roaming will be added soon for cards capable of
this.

For more information see:

http://wireless.kernel.org/en/developers/Regulatory/CRDA

For now we leave an option to enable the old module parameter,
ieee80211_regdom, and to build the 3 old regdomains statically
(US, JP and EU). This option is CONFIG_WIRELESS_OLD_REGULATORY.
These old static definitions and the module parameter is being
scheduled for removal for 2.6.29. Note that if you use this
you won't make use of a world regulatory domain as its pointless.
If you leave this option enabled and if CRDA is present and you
use US or JP we will try to ask CRDA to update us a regulatory
domain for us.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 692 insertions, 113 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 855bff4b3250..592b2e391d42 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2,179 +2,758 @@
  * 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");
+/* To trigger userspace events */
+static struct platform_device *reg_pdev;
 
-struct ieee80211_channel_range {
-        short start_freq;
-        short end_freq;
-        int max_power;
-        int max_antenna_gain;
-        u32 flags;
+/* 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;
-};
+bool is_world_regdom(char *alpha2)
+{
+        if (!alpha2)
+                return false;
+        if (alpha2[0] == '0' && alpha2[1] == '0')
+                return true;
+        return false;
+}
 
-#define RANGE_PWR(_start, _end, _pwr, _ag, _flags)      \
-        { _start, _end, _pwr, _ag, _flags }
+static bool is_alpha2_set(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;
+}
 
-/*
- * 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),
-};
+static bool is_unknown_alpha2(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 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 bool is_an_alpha2(char *alpha2)
+{
+        if (!alpha2)
+                return false;
+        if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
+                return true;
+        return false;
+}
 
-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 bool alpha2_equal(char *alpha2_x, 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(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
+        };
+
+        if (!is_world_regdom((char *) alpha2))
+                printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
+                        alpha2[0], alpha2[1]);
+        else
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+                return -EINVAL;
+#else
+                printk(KERN_INFO "cfg80211: Calling CRDA to update world "
+                        "regulatory domain\n");
+#endif
+
+        country_env[8] = alpha2[0];
+        country_env[9] = alpha2[1];
+
+        return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
+}
+
+/* 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,
+        char *alpha2, struct ieee80211_regdomain *rd)
+{
+        struct regulatory_request *last_request = NULL;
 
-#define REGDOM(_code)                                                   \
-        {                                                               \
-                .code = __stringify(_code),                             \
-                .ranges = ieee80211_ ##_code## _channels,               \
-                .n_ranges = ARRAY_SIZE(ieee80211_ ##_code## _channels), \
+        /* All initial requests are respected */
+        if (list_empty(&regulatory_requests))
+                return 0;
+
+        last_request = list_first_entry(&regulatory_requests,
+                struct regulatory_request, list);
+
+        switch (set_by) {
+        case REGDOM_SET_BY_INIT:
+                return -EINVAL;
+        case REGDOM_SET_BY_CORE:
+                /* Always respect new wireless core hints, should only
+                 * come in for updating the world regulatory domain at init
+                 * anyway */
+                return 0;
+        case REGDOM_SET_BY_COUNTRY_IE:
+                if (last_request->initiator == set_by) {
+                        if (last_request->wiphy != wiphy) {
+                                /* Two cards with two APs claiming different
+                                 * different Country IE alpha2s!
+                                 * You're special!! */
+                                if (!alpha2_equal(last_request->alpha2,
+                                                cfg80211_regdomain->alpha2)) {
+                                        /* XXX: Deal with conflict, consider
+                                         * building a new one out of the
+                                         * intersection */
+                                        WARN_ON(1);
+                                        return -EOPNOTSUPP;
+                                }
+                                return -EALREADY;
+                        }
+                        /* Two consecutive Country IE hints on the same wiphy */
+                        if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+                                return 0;
+                        return -EALREADY;
+                }
+                if (WARN_ON(!is_alpha2_set(alpha2) || !is_an_alpha2(alpha2)),
+                                "Invalid Country IE regulatory hint passed "
+                                "to the wireless core\n")
+                        return -EINVAL;
+                /* We ignore Country IE hints for now, as we haven't yet
+                 * added the dot11MultiDomainCapabilityEnabled flag
+                 * for wiphys */
+                return 1;
+        case REGDOM_SET_BY_DRIVER:
+                BUG_ON(!wiphy);
+                if (last_request->initiator == set_by) {
+                        /* Two separate drivers hinting different things,
+                         * this is possible if you have two devices present
+                         * on a system with different EEPROM regulatory
+                         * readings. XXX: Do intersection, we support only
+                         * the first regulatory hint for now */
+                        if (last_request->wiphy != wiphy)
+                                return -EALREADY;
+                        if (rd)
+                                return -EALREADY;
+                        /* Driver should not be trying to hint different
+                         * regulatory domains! */
+                        BUG_ON(!alpha2_equal(alpha2,
+                                        cfg80211_regdomain->alpha2));
+                        return -EALREADY;
+                }
+                if (last_request->initiator == REGDOM_SET_BY_CORE)
+                        return 0;
+                /* XXX: Handle intersection, and add the
+                 * dot11MultiDomainCapabilityEnabled flag to wiphy. For now
+                 * we assume the driver has this set to false, following the
+                 * 802.11d dot11MultiDomainCapabilityEnabled documentation */
+                if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
+                        return 0;
+                return 0;
+        case REGDOM_SET_BY_USER:
+                if (last_request->initiator == set_by ||
+                                last_request->initiator == REGDOM_SET_BY_CORE)
+                        return 0;
+                /* Drivers can use their wiphy's reg_notifier()
+                 * to override any information */
+                if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+                        return 0;
+                /* XXX: Handle intersection */
+                if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
+                        return -EOPNOTSUPP;
+                return 0;
+        default:
+                return -EINVAL;
         }
+}
 
-static const struct ieee80211_regdomain ieee80211_regdoms[] = {
-        REGDOM(US),
-        REGDOM(JP),
-        REGDOM(EU),
-};
+static bool __reg_is_valid_request(char *alpha2,
+        struct regulatory_request **request)
+{
+        struct regulatory_request *req;
+        if (list_empty(&regulatory_requests))
+                return false;
+        list_for_each_entry(req, &regulatory_requests, list) {
+                if (alpha2_equal(req->alpha2, alpha2)) {
+                        *request = req;
+                        return true;
+                }
+        }
+        return false;
+}
 
+/* Used by nl80211 before kmalloc'ing our regulatory domain */
+bool reg_is_valid_request(char *alpha2)
+{
+        struct regulatory_request *request = NULL;
+        return  __reg_is_valid_request(alpha2, &request);
+}
 
-static const struct ieee80211_regdomain *get_regdom(void)
+/* Sanity check on a regulatory rule */
+static bool is_valid_reg_rule(struct ieee80211_reg_rule *rule)
 {
-        static const struct ieee80211_channel_range
-        ieee80211_world_channels[] = {
-                /* IEEE 802.11b/g, channels 1..11 */
-                RANGE_PWR(2412, 2462, 27, 6, 0),
-        };
-        static const struct ieee80211_regdomain regdom_world = REGDOM(world);
-        int i;
+        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->max_bandwidth_khz > freq_diff)
+                return false;
+
+        return true;
+}
+
+static bool is_valid_rd(struct ieee80211_regdomain *rd)
+{
+        struct ieee80211_reg_rule *reg_rule = NULL;
+        unsigned 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 (!rd->n_reg_rules)
+                return false;
 
-        return &regdom_world;
+        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;
+}
 
-static void handle_channel(struct ieee80211_channel *chan,
-                           const struct ieee80211_regdomain *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;
+}
+
+/**
+ * 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;
 
-        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];
+        if (!cfg80211_regdomain)
+                return -EINVAL;
+
+        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, &reg_rule);
+
+        if (r) {
                 flags |= IEEE80211_CHAN_DISABLED;
                 chan->flags = flags;
                 return;
         }
 
-        chan->flags = flags;
+        power_rule = &reg_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;
 
-        for (band = 0; band < IEEE80211_NUM_BANDS; band++)
+        list_for_each_entry(drv, &cfg80211_drv_list, list)
+                wiphy_update_regulatory(&drv->wiphy, setby);
+}
+
+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);
+        }
+}
+
+/* Caller must hold &cfg80211_drv_mutex */
+int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
+                      const char *alpha2, struct ieee80211_regdomain *rd)
+{
+        struct regulatory_request *request;
+        char *rd_alpha2;
+        int r = 0;
+
+        r = ignore_request(wiphy, set_by, (char *) alpha2, rd);
+        if (r)
+                return r;
+
+        if (rd)
+                rd_alpha2 = rd->alpha2;
+        else
+                rd_alpha2 = (char *) alpha2;
+
+        switch (set_by) {
+        case REGDOM_SET_BY_CORE:
+        case REGDOM_SET_BY_COUNTRY_IE:
+        case REGDOM_SET_BY_DRIVER:
+        case REGDOM_SET_BY_USER:
+                request = kzalloc(sizeof(struct regulatory_request),
+                        GFP_KERNEL);
+                if (!request)
+                        return -ENOMEM;
+
+                request->alpha2[0] = rd_alpha2[0];
+                request->alpha2[1] = rd_alpha2[1];
+                request->initiator = set_by;
+                request->wiphy = wiphy;
+
+                list_add_tail(&request->list, &regulatory_requests);
+                if (rd)
+                        break;
+                r = call_crda(alpha2);
+#ifndef CONFIG_WIRELESS_OLD_REGULATORY
+                if (r)
+                        printk(KERN_ERR "cfg80211: Failed calling CRDA\n");
+#endif
+                break;
+        default:
+                r = -ENOTSUPP;
+                break;
+        }
+
+        return r;
+}
+
+/* If rd is not NULL and if this call fails the caller must free it */
+int regulatory_hint(struct wiphy *wiphy, const char *alpha2,
+        struct ieee80211_regdomain *rd)
+{
+        int r;
+        BUG_ON(!rd && !alpha2);
+
+        mutex_lock(&cfg80211_drv_mutex);
+
+        r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, rd);
+        if (r || !rd)
+                goto unlock_and_exit;
+
+        /* If the driver passed a regulatory domain we skipped asking
+         * userspace for one so we can now go ahead and set it */
+        r = set_regdom(rd);
+
+unlock_and_exit:
+        mutex_unlock(&cfg80211_drv_mutex);
+        return r;
+}
+EXPORT_SYMBOL(regulatory_hint);
+
+
+static void print_rd_rules(struct ieee80211_regdomain *rd)
+{
+        unsigned int i;
+        struct ieee80211_reg_rule *reg_rule = NULL;
+        struct ieee80211_freq_range *freq_range = NULL;
+        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 = &reg_rule->freq_range;
+                power_rule = &reg_rule->power_rule;
+
+                /* There may not be documentation for max antenna gain
+                 * in certain regions */
+                if (power_rule->max_antenna_gain)
+                        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(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);
+}
+
+void print_regdomain_info(struct ieee80211_regdomain *rd)
+{
+        printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
+                rd->alpha2[0], rd->alpha2[1]);
+        print_rd_rules(rd);
+}
+
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+
+static bool is_old_static_regdom(struct ieee80211_regdomain *rd)
+{
+        if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
+                return true;
+        return false;
+}
+
+/* The old crap never deals with a world regulatory domain, it only
+ * deals with the static regulatory domain passed and if possible
+ * an updated "US" or "JP" regulatory domain. We do however store the
+ * old static regulatory domain in cfg80211_world_regdom for convenience
+ * of use here */
+static void reset_regdomains_static(void)
+{
+        if (!is_old_static_regdom(cfg80211_regdomain))
+                kfree(cfg80211_regdomain);
+        /* This is setting the regdom to the old static regdom */
+        cfg80211_regdomain =
+                (struct ieee80211_regdomain *) cfg80211_world_regdom;
+}
+#else
+static void reset_regdomains(void)
+{
+        if (cfg80211_world_regdom && cfg80211_world_regdom != &world_regdom) {
+                if (cfg80211_world_regdom == cfg80211_regdomain) {
+                        kfree(cfg80211_regdomain);
+                } else {
+                        kfree(cfg80211_world_regdom);
+                        kfree(cfg80211_regdomain);
+                }
+        } else if (cfg80211_regdomain && cfg80211_regdomain != &world_regdom)
+                kfree(cfg80211_regdomain);
+
+        cfg80211_world_regdom = (struct ieee80211_regdomain *) &world_regdom;
+        cfg80211_regdomain = NULL;
+}
+
+/* Dynamic world regulatory domain requested by the wireless
+ * core upon initialization */
+static void update_world_regdomain(struct ieee80211_regdomain *rd)
+{
+        BUG_ON(list_empty(&regulatory_requests));
+
+        reset_regdomains();
+
+        cfg80211_world_regdom = rd;
+        cfg80211_regdomain = rd;
+}
+#endif
+
+static int __set_regdom(struct ieee80211_regdomain *rd)
+{
+        struct regulatory_request *request = NULL;
+
+        /* Some basic sanity checks first */
+
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+        /* We ignore the world regdom with the old static regdomains setup
+         * as there is no point to it with satic regulatory definitions :(
+         * Don't worry this shit will be removed soon... */
+        if (is_world_regdom(rd->alpha2))
+                return -EINVAL;
+#else
+        if (is_world_regdom(rd->alpha2)) {
+                if (WARN_ON(!__reg_is_valid_request(rd->alpha2, &request)))
+                        return -EINVAL;
+                update_world_regdomain(rd);
+                return 0;
+        }
+#endif
+
+        if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
+                        !is_unknown_alpha2(rd->alpha2))
+                return -EINVAL;
+
+        if (list_empty(&regulatory_requests))
+                return -EINVAL;
+
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+        /* Static "US" and "JP" will be overridden, but just once */
+        if (!is_old_static_regdom(cfg80211_regdomain) &&
+                        !regdom_changed(rd->alpha2))
+                return -EINVAL;
+#else
+        if (!regdom_changed(rd->alpha2))
+                return -EINVAL;
+#endif
+
+        /* 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, &request)))
+                return -EINVAL;
+
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+        reset_regdomains_static();
+#else
+        reset_regdomains();
+#endif
+
+        /* Country IE parsing coming soon */
+        switch (request->initiator) {
+        case REGDOM_SET_BY_CORE:
+        case REGDOM_SET_BY_DRIVER:
+        case REGDOM_SET_BY_USER:
+                if (!is_valid_rd(rd)) {
+                        printk(KERN_ERR "cfg80211: Invalid "
+                                "regulatory domain detected:\n");
+                        print_regdomain_info(rd);
+                        return -EINVAL;
+                }
+                break;
+        case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */
+                WARN_ON(1);
+        default:
+                return -EOPNOTSUPP;
+        }
+
+        /* Tada! */
+        cfg80211_regdomain = rd;
+        request->granted = 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. If this calls fails you should kfree()
+ * the passed rd. Caller must hold cfg80211_drv_mutex */
+int set_regdom(struct ieee80211_regdomain *rd)
+{
+        struct regulatory_request *this_request = NULL, *prev_request = NULL;
+        int r;
+
+        if (!list_empty(&regulatory_requests))
+                prev_request = list_first_entry(&regulatory_requests,
+                        struct regulatory_request, list);
+
+        /* Note that this doesn't update the wiphys, this is done below */
+        r = __set_regdom(rd);
+        if (r)
+                return r;
+
+        BUG_ON((!__reg_is_valid_request(rd->alpha2, &this_request)));
+
+        /* The initial standard core update of the world regulatory domain, no
+         * need to keep that request info around if it didn't fail. */
+        if (is_world_regdom(rd->alpha2) &&
+                        this_request->initiator == REGDOM_SET_BY_CORE &&
+                        this_request->granted) {
+                list_del(&this_request->list);
+                kfree(this_request);
+                this_request = NULL;
+        }
+
+        /* Remove old requests, we only leave behind the last one */
+        if (prev_request) {
+                list_del(&prev_request->list);
+                kfree(prev_request);
+                prev_request = NULL;
+        }
+
+        /* 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(this_request->initiator);
+
+        print_regdomain(rd);
+
+        return r;
+}
+
+int regulatory_init(void)
+{
+        reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
+        if (IS_ERR(reg_pdev))
+                return PTR_ERR(reg_pdev);
+        return 0;
+}
+
+void regulatory_exit(void)
+{
+        struct regulatory_request *req, *req_tmp;
+        mutex_lock(&cfg80211_drv_mutex);
+#ifdef CONFIG_WIRELESS_OLD_REGULATORY
+        reset_regdomains_static();
+#else
+        reset_regdomains();
+#endif
+        list_for_each_entry_safe(req, req_tmp, &regulatory_requests, list) {
+                list_del(&req->list);
+                kfree(req);
+        }
+        platform_device_unregister(reg_pdev);
+        mutex_unlock(&cfg80211_drv_mutex);
 }