reg.c 42.8 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
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 * Copyright 2008	Luis R. Rodriguez <lrodriguz@atheros.com>
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 *
 * 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.
 */

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/**
 * DOC: Wireless regulatory infrastructure
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 *
 * 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.
 *
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 * 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.
 *
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 */
#include <linux/kernel.h>
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#include <linux/list.h>
#include <linux/random.h>
#include <linux/nl80211.h>
#include <linux/platform_device.h>
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#include <net/wireless.h>
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#include <net/cfg80211.h>
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#include "core.h"
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#include "reg.h"
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/**
 * 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.
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 * @country_ie_checksum: checksum of the last processed and accepted
 * 	country IE
 * @country_ie_env: lets us know if the AP is telling us we are outdoor,
 * 	indoor, or if it doesn't matter
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 */
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struct regulatory_request {
	struct wiphy *wiphy;
	enum reg_set_by initiator;
	char alpha2[2];
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	bool intersect;
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	u32 country_ie_checksum;
	enum environment_cap country_ie_env;
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};

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/* Receipt of information from last regulatory request */
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static struct regulatory_request *last_request;
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/* To trigger userspace events */
static struct platform_device *reg_pdev;
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/* Keep the ordering from large to small */
static u32 supported_bandwidths[] = {
	MHZ_TO_KHZ(40),
	MHZ_TO_KHZ(20),
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};

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/* 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 */
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static const struct ieee80211_regdomain *cfg80211_regdomain;
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/* We use this as a place for the rd structure built from the
 * last parsed country IE to rest until CRDA gets back to us with
 * what it thinks should apply for the same country */
static const struct ieee80211_regdomain *country_ie_regdomain;

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/* 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),
	}
};

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static const struct ieee80211_regdomain *cfg80211_world_regdom =
	&world_regdom;
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#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");

/* 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_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_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),
	}
};

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 *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;
}

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static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
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{
	if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
		return true;
	return false;
}
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#else
static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
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{
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	return false;
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}
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#endif

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static void reset_regdomains(void)
{
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	/* 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);
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	cfg80211_world_regdom = &world_regdom;
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	cfg80211_regdomain = NULL;
}

/* Dynamic world regulatory domain requested by the wireless
 * core upon initialization */
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static void update_world_regdomain(const struct ieee80211_regdomain *rd)
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{
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	BUG_ON(!last_request);
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	reset_regdomains();

	cfg80211_world_regdom = rd;
	cfg80211_regdomain = rd;
}

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bool is_world_regdom(const char *alpha2)
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{
	if (!alpha2)
		return false;
	if (alpha2[0] == '0' && alpha2[1] == '0')
		return true;
	return false;
}
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static bool is_alpha2_set(const char *alpha2)
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{
	if (!alpha2)
		return false;
	if (alpha2[0] != 0 && alpha2[1] != 0)
		return true;
	return false;
}
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static bool is_alpha_upper(char letter)
{
	/* ASCII A - Z */
	if (letter >= 65 && letter <= 90)
		return true;
	return false;
}
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static bool is_unknown_alpha2(const char *alpha2)
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{
	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;
}
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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;
}

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static bool is_an_alpha2(const char *alpha2)
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{
	if (!alpha2)
		return false;
	if (is_alpha_upper(alpha2[0]) && is_alpha_upper(alpha2[1]))
		return true;
	return false;
}
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static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
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{
	if (!alpha2_x || !alpha2_y)
		return false;
	if (alpha2_x[0] == alpha2_y[0] &&
		alpha2_x[1] == alpha2_y[1])
		return true;
	return false;
}

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static bool regdom_changed(const char *alpha2)
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{
	if (!cfg80211_regdomain)
		return true;
	if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
		return false;
	return true;
}

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/**
 * country_ie_integrity_changes - tells us if the country IE has changed
 * @checksum: checksum of country IE of fields we are interested in
 *
 * If the country IE has not changed you can ignore it safely. This is
 * useful to determine if two devices are seeing two different country IEs
 * even on the same alpha2. Note that this will return false if no IE has
 * been set on the wireless core yet.
 */
static bool country_ie_integrity_changes(u32 checksum)
{
	/* If no IE has been set then the checksum doesn't change */
	if (unlikely(!last_request->country_ie_checksum))
		return false;
	if (unlikely(last_request->country_ie_checksum != checksum))
		return true;
	return false;
}

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/* 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
		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(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
}

/* Used by nl80211 before kmalloc'ing our regulatory domain */
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bool reg_is_valid_request(const char *alpha2)
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{
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	if (!last_request)
		return false;

	return alpha2_equal(last_request->alpha2, alpha2);
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}
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/* Sanity check on a regulatory rule */
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static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
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{
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	const struct ieee80211_freq_range *freq_range = &rule->freq_range;
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	u32 freq_diff;

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	if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
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		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;

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	if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
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		return false;

	return true;
}

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static bool is_valid_rd(const struct ieee80211_regdomain *rd)
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{
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	const struct ieee80211_reg_rule *reg_rule = NULL;
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	unsigned int i;
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	if (!rd->n_reg_rules)
		return false;
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	if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
		return false;

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	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;
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}

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/* 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;
}
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/**
 * 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
}

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/* Converts a country IE to a regulatory domain. A regulatory domain
 * structure has a lot of information which the IE doesn't yet have,
 * so for the other values we use upper max values as we will intersect
 * with our userspace regulatory agent to get lower bounds. */
static struct ieee80211_regdomain *country_ie_2_rd(
				u8 *country_ie,
				u8 country_ie_len,
				u32 *checksum)
{
	struct ieee80211_regdomain *rd = NULL;
	unsigned int i = 0;
	char alpha2[2];
	u32 flags = 0;
	u32 num_rules = 0, size_of_regd = 0;
	u8 *triplets_start = NULL;
	u8 len_at_triplet = 0;
	/* the last channel we have registered in a subband (triplet) */
	int last_sub_max_channel = 0;

	*checksum = 0xDEADBEEF;

	/* Country IE requirements */
	BUG_ON(country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN ||
		country_ie_len & 0x01);

	alpha2[0] = country_ie[0];
	alpha2[1] = country_ie[1];

	/*
	 * Third octet can be:
	 *    'I' - Indoor
	 *    'O' - Outdoor
	 *
	 *  anything else we assume is no restrictions
	 */
	if (country_ie[2] == 'I')
		flags = NL80211_RRF_NO_OUTDOOR;
	else if (country_ie[2] == 'O')
		flags = NL80211_RRF_NO_INDOOR;

	country_ie += 3;
	country_ie_len -= 3;

	triplets_start = country_ie;
	len_at_triplet = country_ie_len;

	*checksum ^= ((flags ^ alpha2[0] ^ alpha2[1]) << 8);

	/* We need to build a reg rule for each triplet, but first we must
	 * calculate the number of reg rules we will need. We will need one
	 * for each channel subband */
	while (country_ie_len >= 3) {
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		int end_channel = 0;
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		struct ieee80211_country_ie_triplet *triplet =
			(struct ieee80211_country_ie_triplet *) country_ie;
		int cur_sub_max_channel = 0, cur_channel = 0;

		if (triplet->ext.reg_extension_id >=
				IEEE80211_COUNTRY_EXTENSION_ID) {
			country_ie += 3;
			country_ie_len -= 3;
			continue;
		}

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		/* 2 GHz */
		if (triplet->chans.first_channel <= 14)
			end_channel = triplet->chans.first_channel +
				triplet->chans.num_channels;
		else
			/*
			 * 5 GHz -- For example in country IEs if the first
			 * channel given is 36 and the number of channels is 4
			 * then the individual channel numbers defined for the
			 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
			 * and not 36, 37, 38, 39.
			 *
			 * See: http://tinyurl.com/11d-clarification
			 */
			end_channel =  triplet->chans.first_channel +
				(4 * (triplet->chans.num_channels - 1));

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		cur_channel = triplet->chans.first_channel;
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		cur_sub_max_channel = end_channel;
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		/* Basic sanity check */
		if (cur_sub_max_channel < cur_channel)
			return NULL;

		/* Do not allow overlapping channels. Also channels
		 * passed in each subband must be monotonically
		 * increasing */
		if (last_sub_max_channel) {
			if (cur_channel <= last_sub_max_channel)
				return NULL;
			if (cur_sub_max_channel <= last_sub_max_channel)
				return NULL;
		}

		/* When dot11RegulatoryClassesRequired is supported
		 * we can throw ext triplets as part of this soup,
		 * for now we don't care when those change as we
		 * don't support them */
		*checksum ^= ((cur_channel ^ cur_sub_max_channel) << 8) |
		  ((cur_sub_max_channel ^ cur_sub_max_channel) << 16) |
		  ((triplet->chans.max_power ^ cur_sub_max_channel) << 24);

		last_sub_max_channel = cur_sub_max_channel;

		country_ie += 3;
		country_ie_len -= 3;
		num_rules++;

		/* Note: this is not a IEEE requirement but
		 * simply a memory requirement */
		if (num_rules > NL80211_MAX_SUPP_REG_RULES)
			return NULL;
	}

	country_ie = triplets_start;
	country_ie_len = len_at_triplet;

	size_of_regd = sizeof(struct ieee80211_regdomain) +
		(num_rules * sizeof(struct ieee80211_reg_rule));

	rd = kzalloc(size_of_regd, GFP_KERNEL);
	if (!rd)
		return NULL;

	rd->n_reg_rules = num_rules;
	rd->alpha2[0] = alpha2[0];
	rd->alpha2[1] = alpha2[1];

	/* This time around we fill in the rd */
	while (country_ie_len >= 3) {
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		int end_channel = 0;
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		struct ieee80211_country_ie_triplet *triplet =
			(struct ieee80211_country_ie_triplet *) country_ie;
		struct ieee80211_reg_rule *reg_rule = NULL;
		struct ieee80211_freq_range *freq_range = NULL;
		struct ieee80211_power_rule *power_rule = NULL;

		/* Must parse if dot11RegulatoryClassesRequired is true,
		 * we don't support this yet */
		if (triplet->ext.reg_extension_id >=
				IEEE80211_COUNTRY_EXTENSION_ID) {
			country_ie += 3;
			country_ie_len -= 3;
			continue;
		}

		reg_rule = &rd->reg_rules[i];
		freq_range = &reg_rule->freq_range;
		power_rule = &reg_rule->power_rule;

		reg_rule->flags = flags;

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		/* 2 GHz */
		if (triplet->chans.first_channel <= 14)
			end_channel = triplet->chans.first_channel +
				triplet->chans.num_channels;
		else
			end_channel =  triplet->chans.first_channel +
				(4 * (triplet->chans.num_channels - 1));

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		/* The +10 is since the regulatory domain expects
		 * the actual band edge, not the center of freq for
		 * its start and end freqs, assuming 20 MHz bandwidth on
		 * the channels passed */
		freq_range->start_freq_khz =
			MHZ_TO_KHZ(ieee80211_channel_to_frequency(
				triplet->chans.first_channel) - 10);
		freq_range->end_freq_khz =
			MHZ_TO_KHZ(ieee80211_channel_to_frequency(
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				end_channel) + 10);
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		/* Large arbitrary values, we intersect later */
		/* Increment this if we ever support >= 40 MHz channels
		 * in IEEE 802.11 */
		freq_range->max_bandwidth_khz = MHZ_TO_KHZ(40);
		power_rule->max_antenna_gain = DBI_TO_MBI(100);
		power_rule->max_eirp = DBM_TO_MBM(100);

		country_ie += 3;
		country_ie_len -= 3;
		i++;

		BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
	}

	return rd;
}


642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
/* 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;
}

779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
/* 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
 *
801 802 803 804 805 806 807 808 809 810 811
 * Use this function to get the regulatory rule for a specific frequency on
 * a given wireless device. If the device has a specific regulatory domain
 * it wants to follow we respect that unless a country IE has been received
 * and processed already.
 *
 * Returns 0 if it was able to find a valid regulatory rule which does
 * apply to the given center_freq otherwise it returns non-zero. It will
 * also return -ERANGE if we determine the given center_freq does not even have
 * a regulatory rule for a frequency range in the center_freq's band. See
 * freq_in_rule_band() for our current definition of a band -- this is purely
 * subjective and right now its 802.11 specific.
812 813 814
 */
static int freq_reg_info(u32 center_freq, u32 *bandwidth,
			 const struct ieee80211_reg_rule **reg_rule)
815 816
{
	int i;
817
	bool band_rule_found = false;
818
	u32 max_bandwidth = 0;
819

820 821 822 823 824 825 826 827 828 829 830
	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;
831 832 833 834 835 836 837

		/* 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);

838
		max_bandwidth = freq_max_bandwidth(fr, center_freq);
839

840 841 842
		if (max_bandwidth && *bandwidth <= max_bandwidth) {
			*reg_rule = rr;
			*bandwidth = max_bandwidth;
843 844 845 846
			break;
		}
	}

847 848 849
	if (!band_rule_found)
		return -ERANGE;

850 851 852
	return !max_bandwidth;
}

853 854
static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
			   unsigned int chan_idx)
855 856
{
	int r;
857
	u32 flags;
858 859 860
	u32 max_bandwidth = 0;
	const struct ieee80211_reg_rule *reg_rule = NULL;
	const struct ieee80211_power_rule *power_rule = NULL;
861 862 863 864 865 866 867 868
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *chan;

	sband = wiphy->bands[band];
	BUG_ON(chan_idx >= sband->n_channels);
	chan = &sband->channels[chan_idx];

	flags = chan->orig_flags;
869 870 871 872 873

	r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
		&max_bandwidth, &reg_rule);

	if (r) {
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
		/* This means no regulatory rule was found in the country IE
		 * with a frequency range on the center_freq's band, since
		 * IEEE-802.11 allows for a country IE to have a subset of the
		 * regulatory information provided in a country we ignore
		 * disabling the channel unless at least one reg rule was
		 * found on the center_freq's band. For details see this
		 * clarification:
		 *
		 * http://tinyurl.com/11d-clarification
		 */
		if (r == -ERANGE &&
		    last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
#ifdef CONFIG_CFG80211_REG_DEBUG
			printk(KERN_DEBUG "cfg80211: Leaving channel %d MHz "
				"intact on %s - no rule found in band on "
				"Country IE\n",
				chan->center_freq, wiphy_name(wiphy));
#endif
		} else {
		/* In this case we know the country IE has at least one reg rule
		 * for the band so we respect its band definitions */
#ifdef CONFIG_CFG80211_REG_DEBUG
			if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
				printk(KERN_DEBUG "cfg80211: Disabling "
					"channel %d MHz on %s due to "
					"Country IE\n",
					chan->center_freq, wiphy_name(wiphy));
#endif
			flags |= IEEE80211_CHAN_DISABLED;
			chan->flags = flags;
		}
905 906 907
		return;
	}

908 909 910
	power_rule = &reg_rule->power_rule;

	chan->flags = flags | map_regdom_flags(reg_rule->flags);
911
	chan->max_antenna_gain = min(chan->orig_mag,
912 913
		(int) MBI_TO_DBI(power_rule->max_antenna_gain));
	chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
914
	if (chan->orig_mpwr)
915 916
		chan->max_power = min(chan->orig_mpwr,
			(int) MBM_TO_DBM(power_rule->max_eirp));
917
	else
918
		chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
919 920
}

921
static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
922
{
923 924 925 926 927
	unsigned int i;
	struct ieee80211_supported_band *sband;

	BUG_ON(!wiphy->bands[band]);
	sband = wiphy->bands[band];
928 929

	for (i = 0; i < sband->n_channels; i++)
930
		handle_channel(wiphy, band, i);
931 932
}

933 934 935 936 937 938 939 940 941 942
static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
{
	if (!last_request)
		return true;
	if (setby == REGDOM_SET_BY_CORE &&
		  wiphy->fw_handles_regulatory)
		return true;
	return false;
}

943
static void update_all_wiphy_regulatory(enum reg_set_by setby)
944
{
945
	struct cfg80211_registered_device *drv;
946

947
	list_for_each_entry(drv, &cfg80211_drv_list, list)
948 949
		if (!ignore_reg_update(&drv->wiphy, setby))
			wiphy_update_regulatory(&drv->wiphy, setby);
950 951 952 953 954 955
}

void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
{
	enum ieee80211_band band;
	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
956
		if (wiphy->bands[band])
957
			handle_band(wiphy, band);
958 959 960 961 962
		if (wiphy->reg_notifier)
			wiphy->reg_notifier(wiphy, setby);
	}
}

963 964 965 966
/* 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

967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
/* 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;
			}
1001 1002 1003 1004
			/* Two consecutive Country IE hints on the same wiphy.
			 * This should be picked up early by the driver/stack */
			if (WARN_ON(!alpha2_equal(cfg80211_regdomain->alpha2,
				  alpha2)))
1005 1006 1007
				return 0;
			return -EALREADY;
		}
1008
		return REG_INTERSECT;
1009 1010 1011 1012 1013 1014
	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)
1015
			return REG_INTERSECT;
1016 1017 1018 1019 1020
		/* If the user knows better the user should set the regdom
		 * to their country before the IE is picked up */
		if (last_request->initiator == REGDOM_SET_BY_USER &&
			  last_request->intersect)
			return -EOPNOTSUPP;
1021 1022 1023 1024 1025 1026
		return 0;
	}

	return -EINVAL;
}

1027 1028
/* Caller must hold &cfg80211_drv_mutex */
int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
1029 1030 1031
			const char *alpha2,
			u32 country_ie_checksum,
			enum environment_cap env)
1032 1033
{
	struct regulatory_request *request;
1034
	bool intersect = false;
1035 1036
	int r = 0;

1037
	r = ignore_request(wiphy, set_by, alpha2);
1038 1039 1040 1041

	if (r == REG_INTERSECT)
		intersect = true;
	else if (r)
1042 1043
		return r;

1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	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;
1054 1055
	request->country_ie_checksum = country_ie_checksum;
	request->country_ie_env = env;
1056 1057 1058

	kfree(last_request);
	last_request = request;
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
	/*
	 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
	 * AND if CRDA is NOT present nothing will happen, if someone
	 * wants to bother with 11d with OLD_REG you can add a timer.
	 * If after x amount of time nothing happens you can call:
	 *
	 * return set_regdom(country_ie_regdomain);
	 *
	 * to intersect with the static rd
	 */
1069
	return call_crda(alpha2);
1070 1071
}

1072
void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
1073
{
1074
	BUG_ON(!alpha2);
1075 1076

	mutex_lock(&cfg80211_drv_mutex);
1077
	__regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY);
1078 1079 1080 1081
	mutex_unlock(&cfg80211_drv_mutex);
}
EXPORT_SYMBOL(regulatory_hint);

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
			u32 country_ie_checksum)
{
	if (!last_request->wiphy)
		return false;
	if (likely(last_request->wiphy != wiphy))
		return !country_ie_integrity_changes(country_ie_checksum);
	/* We should not have let these through at this point, they
	 * should have been picked up earlier by the first alpha2 check
	 * on the device */
	if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum)))
		return true;
	return false;
}

void regulatory_hint_11d(struct wiphy *wiphy,
			u8 *country_ie,
			u8 country_ie_len)
{
	struct ieee80211_regdomain *rd = NULL;
	char alpha2[2];
	u32 checksum = 0;
	enum environment_cap env = ENVIRON_ANY;

J
Johannes Berg 已提交
1106 1107 1108
	if (!last_request)
		return;

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	mutex_lock(&cfg80211_drv_mutex);

	/* 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;

	/* Pending country IE processing, this can happen after we
	 * call CRDA and wait for a response if a beacon was received before
	 * we were able to process the last regulatory_hint_11d() call */
	if (country_ie_regdomain)
		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 for *every* beacon processed for the BSSID, so
	 * we optimize an early check to exit out early if we don't have to
	 * do anything */
	if (likely(last_request->wiphy)) {
		struct cfg80211_registered_device *drv_last_ie;

		drv_last_ie = wiphy_to_dev(last_request->wiphy);

		/* Lets keep this simple -- we trust the first AP
		 * after we intersect with CRDA */
		if (likely(last_request->wiphy == wiphy)) {
			/* Ignore IEs coming in on this wiphy with
			 * the same alpha2 and environment cap */
			if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
				  alpha2) &&
				  env == drv_last_ie->env)) {
				goto out;
			}
			/* the wiphy moved on to another BSSID or the AP
			 * was reconfigured. XXX: We need to deal with the
			 * case where the user suspends and goes to goes
			 * to another country, and then gets IEs from an
			 * AP with different settings */
			goto out;
		} else {
			/* Ignore IEs coming in on two separate wiphys with
			 * the same alpha2 and environment cap */
			if (likely(alpha2_equal(drv_last_ie->country_ie_alpha2,
				  alpha2) &&
				  env == drv_last_ie->env)) {
				goto out;
			}
			/* We could potentially intersect though */
			goto out;
		}
	}

	rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
	if (!rd)
		goto out;

	/* This will not happen right now but we leave it here for the
	 * the future when we want to add suspend/resume support and having
	 * the user move to another country after doing so, or having the user
	 * move to another AP. Right now we just trust the first AP. This is why
	 * this is marked as likley(). If we hit this before we add this support
	 * we want to be informed of it as it would indicate a mistake in the
	 * current design  */
	if (likely(WARN_ON(reg_same_country_ie_hint(wiphy, checksum))))
		goto out;

	/* We keep this around for when CRDA comes back with a response so
	 * we can intersect with that */
	country_ie_regdomain = rd;

	__regulatory_hint(wiphy, REGDOM_SET_BY_COUNTRY_IE,
		country_ie_regdomain->alpha2, checksum, env);

out:
	mutex_unlock(&cfg80211_drv_mutex);
}
EXPORT_SYMBOL(regulatory_hint_11d);
1194

1195
static void print_rd_rules(const struct ieee80211_regdomain *rd)
1196 1197
{
	unsigned int i;
1198 1199 1200
	const struct ieee80211_reg_rule *reg_rule = NULL;
	const struct ieee80211_freq_range *freq_range = NULL;
	const struct ieee80211_power_rule *power_rule = NULL;
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229

	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);
	}
}

1230
static void print_regdomain(const struct ieee80211_regdomain *rd)
1231 1232
{

1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	if (is_intersected_alpha2(rd->alpha2)) {
		struct wiphy *wiphy = NULL;
		struct cfg80211_registered_device *drv;

		if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
			if (last_request->wiphy) {
				wiphy = last_request->wiphy;
				drv = wiphy_to_dev(wiphy);
				printk(KERN_INFO "cfg80211: Current regulatory "
					"domain updated by AP to: %c%c\n",
					drv->country_ie_alpha2[0],
					drv->country_ie_alpha2[1]);
			} else
				printk(KERN_INFO "cfg80211: Current regulatory "
					"domain intersected: \n");
		} else
				printk(KERN_INFO "cfg80211: Current regulatory "
					"intersected: \n");
	} else if (is_world_regdom(rd->alpha2))
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
		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);
}

1267
static void print_regdomain_info(const struct ieee80211_regdomain *rd)
1268 1269 1270 1271 1272 1273
{
	printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
		rd->alpha2[0], rd->alpha2[1]);
	print_rd_rules(rd);
}

1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
#ifdef CONFIG_CFG80211_REG_DEBUG
static void reg_country_ie_process_debug(
	const struct ieee80211_regdomain *rd,
	const struct ieee80211_regdomain *country_ie_regdomain,
	const struct ieee80211_regdomain *intersected_rd)
{
	printk(KERN_DEBUG "cfg80211: Received country IE:\n");
	print_regdomain_info(country_ie_regdomain);
	printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
	print_regdomain_info(rd);
	if (intersected_rd) {
		printk(KERN_DEBUG "cfg80211: We intersect both of these "
			"and get:\n");
1287
		print_regdomain_info(intersected_rd);
1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
		return;
	}
	printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
}
#else
static inline void reg_country_ie_process_debug(
	const struct ieee80211_regdomain *rd,
	const struct ieee80211_regdomain *country_ie_regdomain,
	const struct ieee80211_regdomain *intersected_rd)
{
}
#endif

1301
/* Takes ownership of rd only if it doesn't fail */
1302
static int __set_regdom(const struct ieee80211_regdomain *rd)
1303
{
1304
	const struct ieee80211_regdomain *intersected_rd = NULL;
1305 1306
	struct cfg80211_registered_device *drv = NULL;
	struct wiphy *wiphy = NULL;
1307 1308 1309
	/* Some basic sanity checks first */

	if (is_world_regdom(rd->alpha2)) {
1310
		if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1311 1312 1313 1314 1315 1316 1317 1318 1319
			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;

1320
	if (!last_request)
1321 1322
		return -EINVAL;

1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
	/* 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 != 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 (!is_old_static_regdom(cfg80211_regdomain) &&
		    !regdom_changed(rd->alpha2))
			return -EINVAL;
	}

	wiphy = last_request->wiphy;
1335 1336 1337 1338 1339 1340

	/* 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 */

1341
	if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
1342 1343
		return -EINVAL;

1344 1345 1346 1347 1348
	if (!is_valid_rd(rd)) {
		printk(KERN_ERR "cfg80211: Invalid "
			"regulatory domain detected:\n");
		print_regdomain_info(rd);
		return -EINVAL;
1349 1350
	}

1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
	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) {

1361 1362 1363
		intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
		if (!intersected_rd)
			return -EINVAL;
1364 1365

		/* We can trash what CRDA provided now */
1366
		kfree(rd);
1367 1368 1369 1370 1371 1372
		rd = NULL;

		reset_regdomains();
		cfg80211_regdomain = intersected_rd;

		return 0;
1373 1374
	}

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
	/*
	 * Country IE requests are handled a bit differently, we intersect
	 * the country IE rd with what CRDA believes that country should have
	 */

	BUG_ON(!country_ie_regdomain);

	if (rd != country_ie_regdomain) {
		/* Intersect what CRDA returned and our what we
		 * had built from the Country IE received */

		intersected_rd = regdom_intersect(rd, country_ie_regdomain);

		reg_country_ie_process_debug(rd, country_ie_regdomain,
			intersected_rd);

		kfree(country_ie_regdomain);
		country_ie_regdomain = NULL;
	} else {
		/* This would happen when CRDA was not present and
		 * OLD_REGULATORY was enabled. We intersect our Country
		 * IE rd and what was set on cfg80211 originally */
		intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
	}

	if (!intersected_rd)
		return -EINVAL;

	drv = wiphy_to_dev(wiphy);

	drv->country_ie_alpha2[0] = rd->alpha2[0];
	drv->country_ie_alpha2[1] = rd->alpha2[1];
	drv->env = last_request->country_ie_env;

	BUG_ON(intersected_rd == rd);

	kfree(rd);
	rd = NULL;

1414
	reset_regdomains();
1415
	cfg80211_regdomain = intersected_rd;
1416 1417 1418 1419 1420 1421 1422

	return 0;
}


/* Use this call to set the current regulatory domain. Conflicts with
 * multiple drivers can be ironed out later. Caller must've already
1423
 * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
1424
int set_regdom(const struct ieee80211_regdomain *rd)
1425 1426 1427 1428 1429
{
	int r;

	/* Note that this doesn't update the wiphys, this is done below */
	r = __set_regdom(rd);
1430 1431
	if (r) {
		kfree(rd);
1432
		return r;
1433
	}
1434 1435

	/* This would make this whole thing pointless */
1436 1437
	if (!last_request->intersect)
		BUG_ON(rd != cfg80211_regdomain);
1438 1439

	/* update all wiphys now with the new established regulatory domain */
1440
	update_all_wiphy_regulatory(last_request->initiator);
1441

1442
	print_regdomain(cfg80211_regdomain);
1443 1444 1445 1446

	return r;
}

1447 1448 1449
/* Caller must hold cfg80211_drv_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
1450
	if (!last_request || !last_request->wiphy)
1451 1452 1453 1454 1455 1456 1457
		return;
	if (last_request->wiphy != wiphy)
		return;
	last_request->wiphy = NULL;
	last_request->country_ie_env = ENVIRON_ANY;
}

1458 1459
int regulatory_init(void)
{
1460 1461
	int err;

1462 1463 1464
	reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
	if (IS_ERR(reg_pdev))
		return PTR_ERR(reg_pdev);
1465 1466

#ifdef CONFIG_WIRELESS_OLD_REGULATORY
1467
	cfg80211_regdomain = static_regdom(ieee80211_regdom);
1468

1469
	printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
1470 1471 1472 1473 1474
	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 */
J
Johannes Berg 已提交
1475
	if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
1476
		err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
1477
					ieee80211_regdom, 0, ENVIRON_ANY);
1478
#else
1479
	cfg80211_regdomain = cfg80211_world_regdom;
1480

1481
	err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", 0, ENVIRON_ANY);
1482 1483 1484 1485 1486 1487
	if (err)
		printk(KERN_ERR "cfg80211: calling CRDA failed - "
		       "unable to update world regulatory domain, "
		       "using static definition\n");
#endif

1488 1489 1490 1491 1492 1493
	return 0;
}

void regulatory_exit(void)
{
	mutex_lock(&cfg80211_drv_mutex);
1494

1495
	reset_regdomains();
1496

1497 1498 1499
	kfree(country_ie_regdomain);
	country_ie_regdomain = NULL;

1500 1501
	kfree(last_request);

1502
	platform_device_unregister(reg_pdev);
1503

1504
	mutex_unlock(&cfg80211_drv_mutex);
1505
}