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path: root/drivers/net/wireless/ath/regd.c
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Diffstat (limited to 'drivers/net/wireless/ath/regd.c')
-rw-r--r--drivers/net/wireless/ath/regd.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/regd.c b/drivers/net/wireless/ath/regd.c
new file mode 100644
index 00000000000..eef370bd121
--- /dev/null
+++ b/drivers/net/wireless/ath/regd.c
@@ -0,0 +1,575 @@
+/*
+ * Copyright (c) 2008-2009 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <net/cfg80211.h>
+#include <net/mac80211.h>
+#include "regd.h"
+#include "regd_common.h"
+
+/*
+ * This is a set of common rules used by our world regulatory domains.
+ * We have 12 world regulatory domains. To save space we consolidate
+ * the regulatory domains in 5 structures by frequency and change
+ * the flags on our reg_notifier() on a case by case basis.
+ */
+
+/* Only these channels all allow active scan on all world regulatory domains */
+#define ATH9K_2GHZ_CH01_11 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
+
+/* We enable active scan on these a case by case basis by regulatory domain */
+#define ATH9K_2GHZ_CH12_13 REG_RULE(2467-10, 2472+10, 40, 0, 20,\
+ NL80211_RRF_PASSIVE_SCAN)
+#define ATH9K_2GHZ_CH14 REG_RULE(2484-10, 2484+10, 40, 0, 20,\
+ NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
+
+/* We allow IBSS on these on a case by case basis by regulatory domain */
+#define ATH9K_5GHZ_5150_5350 REG_RULE(5150-10, 5350+10, 40, 0, 30,\
+ NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+#define ATH9K_5GHZ_5470_5850 REG_RULE(5470-10, 5850+10, 40, 0, 30,\
+ NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+#define ATH9K_5GHZ_5725_5850 REG_RULE(5725-10, 5850+10, 40, 0, 30,\
+ NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+
+#define ATH9K_2GHZ_ALL ATH9K_2GHZ_CH01_11, \
+ ATH9K_2GHZ_CH12_13, \
+ ATH9K_2GHZ_CH14
+
+#define ATH9K_5GHZ_ALL ATH9K_5GHZ_5150_5350, \
+ ATH9K_5GHZ_5470_5850
+/* This one skips what we call "mid band" */
+#define ATH9K_5GHZ_NO_MIDBAND ATH9K_5GHZ_5150_5350, \
+ ATH9K_5GHZ_5725_5850
+
+/* Can be used for:
+ * 0x60, 0x61, 0x62 */
+static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
+ .n_reg_rules = 5,
+ .alpha2 = "99",
+ .reg_rules = {
+ ATH9K_2GHZ_ALL,
+ ATH9K_5GHZ_ALL,
+ }
+};
+
+/* Can be used by 0x63 and 0x65 */
+static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
+ .n_reg_rules = 4,
+ .alpha2 = "99",
+ .reg_rules = {
+ ATH9K_2GHZ_CH01_11,
+ ATH9K_2GHZ_CH12_13,
+ ATH9K_5GHZ_NO_MIDBAND,
+ }
+};
+
+/* Can be used by 0x64 only */
+static const struct ieee80211_regdomain ath_world_regdom_64 = {
+ .n_reg_rules = 3,
+ .alpha2 = "99",
+ .reg_rules = {
+ ATH9K_2GHZ_CH01_11,
+ ATH9K_5GHZ_NO_MIDBAND,
+ }
+};
+
+/* Can be used by 0x66 and 0x69 */
+static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
+ .n_reg_rules = 3,
+ .alpha2 = "99",
+ .reg_rules = {
+ ATH9K_2GHZ_CH01_11,
+ ATH9K_5GHZ_ALL,
+ }
+};
+
+/* Can be used by 0x67, 0x6A and 0x68 */
+static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
+ .n_reg_rules = 4,
+ .alpha2 = "99",
+ .reg_rules = {
+ ATH9K_2GHZ_CH01_11,
+ ATH9K_2GHZ_CH12_13,
+ ATH9K_5GHZ_ALL,
+ }
+};
+
+static inline bool is_wwr_sku(u16 regd)
+{
+ return ((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
+ (regd == WORLD);
+}
+
+static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
+{
+ return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
+}
+
+bool ath_is_world_regd(struct ath_regulatory *reg)
+{
+ return is_wwr_sku(ath_regd_get_eepromRD(reg));
+}
+EXPORT_SYMBOL(ath_is_world_regd);
+
+static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
+{
+ /* this is the most restrictive */
+ return &ath_world_regdom_64;
+}
+
+static const struct
+ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
+{
+ switch (reg->regpair->regDmnEnum) {
+ case 0x60:
+ case 0x61:
+ case 0x62:
+ return &ath_world_regdom_60_61_62;
+ case 0x63:
+ case 0x65:
+ return &ath_world_regdom_63_65;
+ case 0x64:
+ return &ath_world_regdom_64;
+ case 0x66:
+ case 0x69:
+ return &ath_world_regdom_66_69;
+ case 0x67:
+ case 0x68:
+ case 0x6A:
+ return &ath_world_regdom_67_68_6A;
+ default:
+ WARN_ON(1);
+ return ath_default_world_regdomain();
+ }
+}
+
+/* Frequency is one where radar detection is required */
+static bool ath_is_radar_freq(u16 center_freq)
+{
+ return (center_freq >= 5260 && center_freq <= 5700);
+}
+
+/*
+ * N.B: These exception rules do not apply radar freqs.
+ *
+ * - We enable adhoc (or beaconing) if allowed by 11d
+ * - We enable active scan if the channel is allowed by 11d
+ * - If no country IE has been processed and a we determine we have
+ * received a beacon on a channel we can enable active scan and
+ * adhoc (or beaconing).
+ */
+static void
+ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
+{
+ enum ieee80211_band band;
+ struct ieee80211_supported_band *sband;
+ const struct ieee80211_reg_rule *reg_rule;
+ struct ieee80211_channel *ch;
+ unsigned int i;
+ u32 bandwidth = 0;
+ int r;
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+
+ if (!wiphy->bands[band])
+ continue;
+
+ sband = wiphy->bands[band];
+
+ for (i = 0; i < sband->n_channels; i++) {
+
+ ch = &sband->channels[i];
+
+ if (ath_is_radar_freq(ch->center_freq) ||
+ (ch->flags & IEEE80211_CHAN_RADAR))
+ continue;
+
+ if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ r = freq_reg_info(wiphy,
+ ch->center_freq,
+ bandwidth,
+ &reg_rule);
+ if (r)
+ continue;
+ /*
+ * If 11d had a rule for this channel ensure
+ * we enable adhoc/beaconing if it allows us to
+ * use it. Note that we would have disabled it
+ * by applying our static world regdomain by
+ * default during init, prior to calling our
+ * regulatory_hint().
+ */
+ if (!(reg_rule->flags &
+ NL80211_RRF_NO_IBSS))
+ ch->flags &=
+ ~IEEE80211_CHAN_NO_IBSS;
+ if (!(reg_rule->flags &
+ NL80211_RRF_PASSIVE_SCAN))
+ ch->flags &=
+ ~IEEE80211_CHAN_PASSIVE_SCAN;
+ } else {
+ if (ch->beacon_found)
+ ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
+ IEEE80211_CHAN_PASSIVE_SCAN);
+ }
+ }
+ }
+
+}
+
+/* Allows active scan scan on Ch 12 and 13 */
+static void
+ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *ch;
+ const struct ieee80211_reg_rule *reg_rule;
+ u32 bandwidth = 0;
+ int r;
+
+ sband = wiphy->bands[IEEE80211_BAND_2GHZ];
+
+ /*
+ * If no country IE has been received always enable active scan
+ * on these channels. This is only done for specific regulatory SKUs
+ */
+ if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ ch = &sband->channels[11]; /* CH 12 */
+ if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+ ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+ ch = &sband->channels[12]; /* CH 13 */
+ if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+ ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+ return;
+ }
+
+ /*
+ * If a country IE has been recieved check its rule for this
+ * channel first before enabling active scan. The passive scan
+ * would have been enforced by the initial processing of our
+ * custom regulatory domain.
+ */
+
+ ch = &sband->channels[11]; /* CH 12 */
+ r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
+ if (!r) {
+ if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
+ if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+ ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+ }
+
+ ch = &sband->channels[12]; /* CH 13 */
+ r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
+ if (!r) {
+ if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
+ if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+ ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+ }
+}
+
+/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
+static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *ch;
+ unsigned int i;
+
+ if (!wiphy->bands[IEEE80211_BAND_5GHZ])
+ return;
+
+ sband = wiphy->bands[IEEE80211_BAND_5GHZ];
+
+ for (i = 0; i < sband->n_channels; i++) {
+ ch = &sband->channels[i];
+ if (!ath_is_radar_freq(ch->center_freq))
+ continue;
+ /* We always enable radar detection/DFS on this
+ * frequency range. Additionally we also apply on
+ * this frequency range:
+ * - If STA mode does not yet have DFS supports disable
+ * active scanning
+ * - If adhoc mode does not support DFS yet then
+ * disable adhoc in the frequency.
+ * - If AP mode does not yet support radar detection/DFS
+ * do not allow AP mode
+ */
+ if (!(ch->flags & IEEE80211_CHAN_DISABLED))
+ ch->flags |= IEEE80211_CHAN_RADAR |
+ IEEE80211_CHAN_NO_IBSS |
+ IEEE80211_CHAN_PASSIVE_SCAN;
+ }
+}
+
+static void ath_reg_apply_world_flags(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator,
+ struct ath_regulatory *reg)
+{
+ switch (reg->regpair->regDmnEnum) {
+ case 0x60:
+ case 0x63:
+ case 0x66:
+ case 0x67:
+ ath_reg_apply_beaconing_flags(wiphy, initiator);
+ break;
+ case 0x68:
+ ath_reg_apply_beaconing_flags(wiphy, initiator);
+ ath_reg_apply_active_scan_flags(wiphy, initiator);
+ break;
+ }
+ return;
+}
+
+int ath_reg_notifier_apply(struct wiphy *wiphy,
+ struct regulatory_request *request,
+ struct ath_regulatory *reg)
+{
+ /* We always apply this */
+ ath_reg_apply_radar_flags(wiphy);
+
+ switch (request->initiator) {
+ case NL80211_REGDOM_SET_BY_DRIVER:
+ case NL80211_REGDOM_SET_BY_CORE:
+ case NL80211_REGDOM_SET_BY_USER:
+ break;
+ case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+ if (ath_is_world_regd(reg))
+ ath_reg_apply_world_flags(wiphy, request->initiator,
+ reg);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(ath_reg_notifier_apply);
+
+static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
+{
+ u16 rd = ath_regd_get_eepromRD(reg);
+ int i;
+
+ if (rd & COUNTRY_ERD_FLAG) {
+ /* EEPROM value is a country code */
+ u16 cc = rd & ~COUNTRY_ERD_FLAG;
+ printk(KERN_DEBUG
+ "ath: EEPROM indicates we should expect "
+ "a country code\n");
+ for (i = 0; i < ARRAY_SIZE(allCountries); i++)
+ if (allCountries[i].countryCode == cc)
+ return true;
+ } else {
+ /* EEPROM value is a regpair value */
+ if (rd != CTRY_DEFAULT)
+ printk(KERN_DEBUG "ath: EEPROM indicates we "
+ "should expect a direct regpair map\n");
+ for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
+ if (regDomainPairs[i].regDmnEnum == rd)
+ return true;
+ }
+ printk(KERN_DEBUG
+ "ath: invalid regulatory domain/country code 0x%x\n", rd);
+ return false;
+}
+
+/* EEPROM country code to regpair mapping */
+static struct country_code_to_enum_rd*
+ath_regd_find_country(u16 countryCode)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
+ if (allCountries[i].countryCode == countryCode)
+ return &allCountries[i];
+ }
+ return NULL;
+}
+
+/* EEPROM rd code to regpair mapping */
+static struct country_code_to_enum_rd*
+ath_regd_find_country_by_rd(int regdmn)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
+ if (allCountries[i].regDmnEnum == regdmn)
+ return &allCountries[i];
+ }
+ return NULL;
+}
+
+/* Returns the map of the EEPROM set RD to a country code */
+static u16 ath_regd_get_default_country(u16 rd)
+{
+ if (rd & COUNTRY_ERD_FLAG) {
+ struct country_code_to_enum_rd *country = NULL;
+ u16 cc = rd & ~COUNTRY_ERD_FLAG;
+
+ country = ath_regd_find_country(cc);
+ if (country != NULL)
+ return cc;
+ }
+
+ return CTRY_DEFAULT;
+}
+
+static struct reg_dmn_pair_mapping*
+ath_get_regpair(int regdmn)
+{
+ int i;
+
+ if (regdmn == NO_ENUMRD)
+ return NULL;
+ for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
+ if (regDomainPairs[i].regDmnEnum == regdmn)
+ return &regDomainPairs[i];
+ }
+ return NULL;
+}
+
+static int
+ath_regd_init_wiphy(struct ath_regulatory *reg,
+ struct wiphy *wiphy,
+ int (*reg_notifier)(struct wiphy *wiphy,
+ struct regulatory_request *request))
+{
+ const struct ieee80211_regdomain *regd;
+
+ wiphy->reg_notifier = reg_notifier;
+ wiphy->strict_regulatory = true;
+
+ if (ath_is_world_regd(reg)) {
+ /*
+ * Anything applied here (prior to wiphy registration) gets
+ * saved on the wiphy orig_* parameters
+ */
+ regd = ath_world_regdomain(reg);
+ wiphy->custom_regulatory = true;
+ wiphy->strict_regulatory = false;
+ } else {
+ /*
+ * This gets applied in the case of the absense of CRDA,
+ * it's our own custom world regulatory domain, similar to
+ * cfg80211's but we enable passive scanning.
+ */
+ regd = ath_default_world_regdomain();
+ }
+ wiphy_apply_custom_regulatory(wiphy, regd);
+ ath_reg_apply_radar_flags(wiphy);
+ ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
+ return 0;
+}
+
+int
+ath_regd_init(struct ath_regulatory *reg,
+ struct wiphy *wiphy,
+ int (*reg_notifier)(struct wiphy *wiphy,
+ struct regulatory_request *request))
+{
+ struct country_code_to_enum_rd *country = NULL;
+ u16 regdmn;
+
+ if (!reg)
+ return -EINVAL;
+
+ printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
+
+ if (!ath_regd_is_eeprom_valid(reg)) {
+ printk(KERN_ERR "ath: Invalid EEPROM contents\n");
+ return -EINVAL;
+ }
+
+ regdmn = ath_regd_get_eepromRD(reg);
+ reg->country_code = ath_regd_get_default_country(regdmn);
+
+ if (reg->country_code == CTRY_DEFAULT &&
+ regdmn == CTRY_DEFAULT) {
+ printk(KERN_DEBUG "ath: EEPROM indicates default "
+ "country code should be used\n");
+ reg->country_code = CTRY_UNITED_STATES;
+ }
+
+ if (reg->country_code == CTRY_DEFAULT) {
+ country = NULL;
+ } else {
+ printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
+ "map search\n");
+ country = ath_regd_find_country(reg->country_code);
+ if (country == NULL) {
+ printk(KERN_DEBUG
+ "ath: no valid country maps found for "
+ "country code: 0x%0x\n",
+ reg->country_code);
+ return -EINVAL;
+ } else {
+ regdmn = country->regDmnEnum;
+ printk(KERN_DEBUG "ath: country maps to "
+ "regdmn code: 0x%0x\n",
+ regdmn);
+ }
+ }
+
+ reg->regpair = ath_get_regpair(regdmn);
+
+ if (!reg->regpair) {
+ printk(KERN_DEBUG "ath: "
+ "No regulatory domain pair found, cannot continue\n");
+ return -EINVAL;
+ }
+
+ if (!country)
+ country = ath_regd_find_country_by_rd(regdmn);
+
+ if (country) {
+ reg->alpha2[0] = country->isoName[0];
+ reg->alpha2[1] = country->isoName[1];
+ } else {
+ reg->alpha2[0] = '0';
+ reg->alpha2[1] = '0';
+ }
+
+ printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
+ reg->alpha2[0], reg->alpha2[1]);
+ printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
+ reg->regpair->regDmnEnum);
+
+ ath_regd_init_wiphy(reg, wiphy, reg_notifier);
+ return 0;
+}
+EXPORT_SYMBOL(ath_regd_init);
+
+u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
+ enum ieee80211_band band)
+{
+ if (!reg->regpair ||
+ (reg->country_code == CTRY_DEFAULT &&
+ is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
+ return SD_NO_CTL;
+ }
+
+ switch (band) {
+ case IEEE80211_BAND_2GHZ:
+ return reg->regpair->reg_2ghz_ctl;
+ case IEEE80211_BAND_5GHZ:
+ return reg->regpair->reg_5ghz_ctl;
+ default:
+ return NO_CTL;
+ }
+
+ return NO_CTL;
+}
+EXPORT_SYMBOL(ath_regd_get_band_ctl);
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