*
*/
#include <linux/kernel.h>
+#include <linux/slab.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"
+#include "regdb.h"
+#include "nl80211.h"
+
+#ifdef CONFIG_CFG80211_REG_DEBUG
+#define REG_DBG_PRINT(format, args...) \
+ do { \
+ printk(KERN_DEBUG format , ## args); \
+ } while (0)
+#else
+#define REG_DBG_PRINT(args...)
+#endif
/* Receipt of information from last regulatory request */
static struct regulatory_request *last_request;
/* To trigger userspace events */
static struct platform_device *reg_pdev;
-/* Keep the ordering from large to small */
-static u32 supported_bandwidths[] = {
- MHZ_TO_KHZ(40),
- MHZ_TO_KHZ(20),
-};
-
/*
* Central wireless core regulatory domains, we only need two,
* the current one and a world regulatory domain in case we have no
*/
static const struct ieee80211_regdomain *country_ie_regdomain;
+/*
+ * Protects static reg.c components:
+ * - cfg80211_world_regdom
+ * - cfg80211_regdom
+ * - country_ie_regdomain
+ * - last_request
+ */
+DEFINE_MUTEX(reg_mutex);
+#define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex))
+
/* Used to queue up regulatory hints */
static LIST_HEAD(reg_requests_list);
static spinlock_t reg_requests_lock;
/* We keep a static world regulatory domain in case of the absence of CRDA */
static const struct ieee80211_regdomain world_regdom = {
- .n_reg_rules = 3,
+ .n_reg_rules = 5,
.alpha2 = "00",
.reg_rules = {
/* IEEE 802.11b/g, channels 1..11 */
REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
- /* IEEE 802.11a, channel 36..48 */
- REG_RULE(5180-10, 5240+10, 40, 6, 23,
+ /* IEEE 802.11b/g, channels 12..13. No HT40
+ * channel fits here. */
+ REG_RULE(2467-10, 2472+10, 20, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS),
+ /* IEEE 802.11 channel 14 - Only JP enables
+ * this and for 802.11b only */
+ REG_RULE(2484-10, 2484+10, 20, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS |
+ NL80211_RRF_NO_OFDM),
+ /* IEEE 802.11a, channel 36..48 */
+ REG_RULE(5180-10, 5240+10, 40, 6, 20,
+ NL80211_RRF_PASSIVE_SCAN |
+ NL80211_RRF_NO_IBSS),
/* NB: 5260 MHz - 5700 MHz requies DFS */
/* IEEE 802.11a, channel 149..165 */
- REG_RULE(5745-10, 5825+10, 40, 6, 23,
+ REG_RULE(5745-10, 5825+10, 40, 6, 20,
NL80211_RRF_PASSIVE_SCAN |
NL80211_RRF_NO_IBSS),
}
static const struct ieee80211_regdomain *cfg80211_world_regdom =
&world_regdom;
-#ifdef CONFIG_WIRELESS_OLD_REGULATORY
-static char *ieee80211_regdom = "US";
+static char *ieee80211_regdom = "00";
+static char user_alpha2[2];
+
module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
-/*
- * 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;
-}
-
-static bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
-{
- if (rd == &us_regdom || rd == &jp_regdom || rd == &eu_regdom)
- return true;
- return false;
-}
-#else
-static inline bool is_old_static_regdom(const struct ieee80211_regdomain *rd)
-{
- return false;
-}
-#endif
-
static void reset_regdomains(void)
{
/* avoid freeing static information or freeing something twice */
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);
return true;
}
+/*
+ * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
+ * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
+ * has ever been issued.
+ */
+static bool is_user_regdom_saved(void)
+{
+ if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
+ return false;
+
+ /* This would indicate a mistake on the design */
+ if (WARN((!is_world_regdom(user_alpha2) &&
+ !is_an_alpha2(user_alpha2)),
+ "Unexpected user alpha2: %c%c\n",
+ user_alpha2[0],
+ user_alpha2[1]))
+ return false;
+
+ return true;
+}
+
/**
* country_ie_integrity_changes - tells us if the country IE has changed
* @checksum: checksum of country IE of fields we are interested in
return false;
}
+static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
+ const struct ieee80211_regdomain *src_regd)
+{
+ struct ieee80211_regdomain *regd;
+ int size_of_regd = 0;
+ unsigned int i;
+
+ size_of_regd = sizeof(struct ieee80211_regdomain) +
+ ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
+
+ regd = kzalloc(size_of_regd, GFP_KERNEL);
+ if (!regd)
+ return -ENOMEM;
+
+ memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
+
+ for (i = 0; i < src_regd->n_reg_rules; i++)
+ memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
+ sizeof(struct ieee80211_reg_rule));
+
+ *dst_regd = regd;
+ return 0;
+}
+
+#ifdef CONFIG_CFG80211_INTERNAL_REGDB
+struct reg_regdb_search_request {
+ char alpha2[2];
+ struct list_head list;
+};
+
+static LIST_HEAD(reg_regdb_search_list);
+static DEFINE_MUTEX(reg_regdb_search_mutex);
+
+static void reg_regdb_search(struct work_struct *work)
+{
+ struct reg_regdb_search_request *request;
+ const struct ieee80211_regdomain *curdom, *regdom;
+ int i, r;
+
+ mutex_lock(®_regdb_search_mutex);
+ while (!list_empty(®_regdb_search_list)) {
+ request = list_first_entry(®_regdb_search_list,
+ struct reg_regdb_search_request,
+ list);
+ list_del(&request->list);
+
+ for (i=0; i<reg_regdb_size; i++) {
+ curdom = reg_regdb[i];
+
+ if (!memcmp(request->alpha2, curdom->alpha2, 2)) {
+ r = reg_copy_regd(®dom, curdom);
+ if (r)
+ break;
+ mutex_lock(&cfg80211_mutex);
+ set_regdom(regdom);
+ mutex_unlock(&cfg80211_mutex);
+ break;
+ }
+ }
+
+ kfree(request);
+ }
+ mutex_unlock(®_regdb_search_mutex);
+}
+
+static DECLARE_WORK(reg_regdb_work, reg_regdb_search);
+
+static void reg_regdb_query(const char *alpha2)
+{
+ struct reg_regdb_search_request *request;
+
+ if (!alpha2)
+ return;
+
+ request = kzalloc(sizeof(struct reg_regdb_search_request), GFP_KERNEL);
+ if (!request)
+ return;
+
+ memcpy(request->alpha2, alpha2, 2);
+
+ mutex_lock(®_regdb_search_mutex);
+ list_add_tail(&request->list, ®_regdb_search_list);
+ mutex_unlock(®_regdb_search_mutex);
+
+ schedule_work(®_regdb_work);
+}
+#else
+static inline void reg_regdb_query(const char *alpha2) {}
+#endif /* CONFIG_CFG80211_INTERNAL_REGDB */
+
/*
* This lets us keep regulatory code which is updated on a regulatory
* basis in userspace.
printk(KERN_INFO "cfg80211: Calling CRDA to update world "
"regulatory domain\n");
+ /* query internal regulatory database (if it exists) */
+ reg_regdb_query(alpha2);
+
country_env[8] = alpha2[0];
country_env[9] = alpha2[1];
/* Used by nl80211 before kmalloc'ing our regulatory domain */
bool reg_is_valid_request(const char *alpha2)
{
+ assert_cfg80211_lock();
+
if (!last_request)
return false;
freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
- if (freq_diff <= 0 || freq_range->max_bandwidth_khz > freq_diff)
+ if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
+ freq_range->max_bandwidth_khz > freq_diff)
return false;
return true;
return true;
}
-/* Returns value in KHz */
-static u32 freq_max_bandwidth(const struct ieee80211_freq_range *freq_range,
- u32 freq)
+static bool reg_does_bw_fit(const struct ieee80211_freq_range *freq_range,
+ u32 center_freq_khz,
+ u32 bw_khz)
{
- 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;
+ u32 start_freq_khz, end_freq_khz;
+
+ start_freq_khz = center_freq_khz - (bw_khz/2);
+ end_freq_khz = center_freq_khz + (bw_khz/2);
+
+ if (start_freq_khz >= freq_range->start_freq_khz &&
+ end_freq_khz <= freq_range->end_freq_khz)
+ return true;
+
+ return false;
}
/**
}
/*
+ * This is a work around for sanity checking ieee80211_channel_to_frequency()'s
+ * work. ieee80211_channel_to_frequency() can for example currently provide a
+ * 2 GHz channel when in fact a 5 GHz channel was desired. An example would be
+ * an AP providing channel 8 on a country IE triplet when it sent this on the
+ * 5 GHz band, that channel is designed to be channel 8 on 5 GHz, not a 2 GHz
+ * channel.
+ *
+ * This can be removed once ieee80211_channel_to_frequency() takes in a band.
+ */
+static bool chan_in_band(int chan, enum ieee80211_band band)
+{
+ int center_freq = ieee80211_channel_to_frequency(chan);
+
+ switch (band) {
+ case IEEE80211_BAND_2GHZ:
+ if (center_freq <= 2484)
+ return true;
+ return false;
+ case IEEE80211_BAND_5GHZ:
+ if (center_freq >= 5005)
+ return true;
+ return false;
+ default:
+ return false;
+ }
+}
+
+/*
+ * Some APs may send a country IE triplet for each channel they
+ * support and while this is completely overkill and silly we still
+ * need to support it. We avoid making a single rule for each channel
+ * though and to help us with this we use this helper to find the
+ * actual subband end channel. These type of country IE triplet
+ * scenerios are handled then, all yielding two regulaotry rules from
+ * parsing a country IE:
+ *
+ * [1]
+ * [2]
+ * [36]
+ * [40]
+ *
+ * [1]
+ * [2-4]
+ * [5-12]
+ * [36]
+ * [40-44]
+ *
+ * [1-4]
+ * [5-7]
+ * [36-44]
+ * [48-64]
+ *
+ * [36-36]
+ * [40-40]
+ * [44-44]
+ * [48-48]
+ * [52-52]
+ * [56-56]
+ * [60-60]
+ * [64-64]
+ * [100-100]
+ * [104-104]
+ * [108-108]
+ * [112-112]
+ * [116-116]
+ * [120-120]
+ * [124-124]
+ * [128-128]
+ * [132-132]
+ * [136-136]
+ * [140-140]
+ *
+ * Returns 0 if the IE has been found to be invalid in the middle
+ * somewhere.
+ */
+static int max_subband_chan(enum ieee80211_band band,
+ int orig_cur_chan,
+ int orig_end_channel,
+ s8 orig_max_power,
+ u8 **country_ie,
+ u8 *country_ie_len)
+{
+ u8 *triplets_start = *country_ie;
+ u8 len_at_triplet = *country_ie_len;
+ int end_subband_chan = orig_end_channel;
+
+ /*
+ * We'll deal with padding for the caller unless
+ * its not immediate and we don't process any channels
+ */
+ if (*country_ie_len == 1) {
+ *country_ie += 1;
+ *country_ie_len -= 1;
+ return orig_end_channel;
+ }
+
+ /* Move to the next triplet and then start search */
+ *country_ie += 3;
+ *country_ie_len -= 3;
+
+ if (!chan_in_band(orig_cur_chan, band))
+ return 0;
+
+ while (*country_ie_len >= 3) {
+ int end_channel = 0;
+ struct ieee80211_country_ie_triplet *triplet =
+ (struct ieee80211_country_ie_triplet *) *country_ie;
+ int cur_channel = 0, next_expected_chan;
+
+ /* means last triplet is completely unrelated to this one */
+ if (triplet->ext.reg_extension_id >=
+ IEEE80211_COUNTRY_EXTENSION_ID) {
+ *country_ie -= 3;
+ *country_ie_len += 3;
+ break;
+ }
+
+ if (triplet->chans.first_channel == 0) {
+ *country_ie += 1;
+ *country_ie_len -= 1;
+ if (*country_ie_len != 0)
+ return 0;
+ break;
+ }
+
+ if (triplet->chans.num_channels == 0)
+ return 0;
+
+ /* Monitonically increasing channel order */
+ if (triplet->chans.first_channel <= end_subband_chan)
+ return 0;
+
+ if (!chan_in_band(triplet->chans.first_channel, band))
+ return 0;
+
+ /* 2 GHz */
+ if (triplet->chans.first_channel <= 14) {
+ end_channel = triplet->chans.first_channel +
+ triplet->chans.num_channels - 1;
+ }
+ else {
+ end_channel = triplet->chans.first_channel +
+ (4 * (triplet->chans.num_channels - 1));
+ }
+
+ if (!chan_in_band(end_channel, band))
+ return 0;
+
+ if (orig_max_power != triplet->chans.max_power) {
+ *country_ie -= 3;
+ *country_ie_len += 3;
+ break;
+ }
+
+ cur_channel = triplet->chans.first_channel;
+
+ /* The key is finding the right next expected channel */
+ if (band == IEEE80211_BAND_2GHZ)
+ next_expected_chan = end_subband_chan + 1;
+ else
+ next_expected_chan = end_subband_chan + 4;
+
+ if (cur_channel != next_expected_chan) {
+ *country_ie -= 3;
+ *country_ie_len += 3;
+ break;
+ }
+
+ end_subband_chan = end_channel;
+
+ /* Move to the next one */
+ *country_ie += 3;
+ *country_ie_len -= 3;
+
+ /*
+ * Padding needs to be dealt with if we processed
+ * some channels.
+ */
+ if (*country_ie_len == 1) {
+ *country_ie += 1;
+ *country_ie_len -= 1;
+ break;
+ }
+
+ /* If seen, the IE is invalid */
+ if (*country_ie_len == 2)
+ return 0;
+ }
+
+ if (end_subband_chan == orig_end_channel) {
+ *country_ie = triplets_start;
+ *country_ie_len = len_at_triplet;
+ return orig_end_channel;
+ }
+
+ return end_subband_chan;
+}
+
+/*
* 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(
+ enum ieee80211_band band,
u8 *country_ie,
u8 country_ie_len,
u32 *checksum)
continue;
}
+ /*
+ * APs can add padding to make length divisible
+ * by two, required by the spec.
+ */
+ if (triplet->chans.first_channel == 0) {
+ country_ie++;
+ country_ie_len--;
+ /* This is expected to be at the very end only */
+ if (country_ie_len != 0)
+ return NULL;
+ break;
+ }
+
+ if (triplet->chans.num_channels == 0)
+ return NULL;
+
+ if (!chan_in_band(triplet->chans.first_channel, band))
+ return NULL;
+
/* 2 GHz */
- if (triplet->chans.first_channel <= 14)
+ if (band == IEEE80211_BAND_2GHZ)
end_channel = triplet->chans.first_channel +
- triplet->chans.num_channels;
+ triplet->chans.num_channels - 1;
else
/*
* 5 GHz -- For example in country IEs if the first
(4 * (triplet->chans.num_channels - 1));
cur_channel = triplet->chans.first_channel;
+
+ /*
+ * Enhancement for APs that send a triplet for every channel
+ * or for whatever reason sends triplets with multiple channels
+ * separated when in fact they should be together.
+ */
+ end_channel = max_subband_chan(band,
+ cur_channel,
+ end_channel,
+ triplet->chans.max_power,
+ &country_ie,
+ &country_ie_len);
+ if (!end_channel)
+ return NULL;
+
+ if (!chan_in_band(end_channel, band))
+ return NULL;
+
cur_sub_max_channel = end_channel;
/* Basic sanity check */
last_sub_max_channel = cur_sub_max_channel;
- country_ie += 3;
- country_ie_len -= 3;
num_rules++;
+ if (country_ie_len >= 3) {
+ country_ie += 3;
+ country_ie_len -= 3;
+ }
+
/*
* Note: this is not a IEEE requirement but
* simply a memory requirement
continue;
}
+ if (triplet->chans.first_channel == 0) {
+ country_ie++;
+ country_ie_len--;
+ break;
+ }
+
reg_rule = &rd->reg_rules[i];
freq_range = ®_rule->freq_range;
power_rule = ®_rule->power_rule;
reg_rule->flags = flags;
/* 2 GHz */
- if (triplet->chans.first_channel <= 14)
+ if (band == IEEE80211_BAND_2GHZ)
end_channel = triplet->chans.first_channel +
- triplet->chans.num_channels;
+ triplet->chans.num_channels -1;
else
end_channel = triplet->chans.first_channel +
(4 * (triplet->chans.num_channels - 1));
+ end_channel = max_subband_chan(band,
+ triplet->chans.first_channel,
+ end_channel,
+ triplet->chans.max_power,
+ &country_ie,
+ &country_ie_len);
+
/*
* The +10 is since the regulatory domain expects
* the actual band edge, not the center of freq for
*/
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);
+ power_rule->max_eirp = DBM_TO_MBM(triplet->chans.max_power);
- country_ie += 3;
- country_ie_len -= 3;
i++;
+ if (country_ie_len >= 3) {
+ country_ie += 3;
+ country_ie_len -= 3;
+ }
+
BUG_ON(i > NL80211_MAX_SUPP_REG_RULES);
}
static int freq_reg_info_regd(struct wiphy *wiphy,
u32 center_freq,
- u32 *bandwidth,
+ u32 desired_bw_khz,
const struct ieee80211_reg_rule **reg_rule,
const struct ieee80211_regdomain *custom_regd)
{
int i;
bool band_rule_found = false;
const struct ieee80211_regdomain *regd;
- u32 max_bandwidth = 0;
+ bool bw_fits = false;
+
+ if (!desired_bw_khz)
+ desired_bw_khz = MHZ_TO_KHZ(20);
regd = custom_regd ? custom_regd : cfg80211_regdomain;
* Follow the driver's regulatory domain, if present, unless a country
* IE has been processed or a user wants to help complaince further
*/
- if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
- last_request->initiator != REGDOM_SET_BY_USER &&
+ if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ last_request->initiator != NL80211_REGDOM_SET_BY_USER &&
wiphy->regd)
regd = wiphy->regd;
if (!band_rule_found)
band_rule_found = freq_in_rule_band(fr, center_freq);
- max_bandwidth = freq_max_bandwidth(fr, center_freq);
+ bw_fits = reg_does_bw_fit(fr,
+ center_freq,
+ desired_bw_khz);
- if (max_bandwidth && *bandwidth <= max_bandwidth) {
+ if (band_rule_found && bw_fits) {
*reg_rule = rr;
- *bandwidth = max_bandwidth;
- break;
+ return 0;
}
}
if (!band_rule_found)
return -ERANGE;
- return !max_bandwidth;
+ return -EINVAL;
}
EXPORT_SYMBOL(freq_reg_info);
-int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
- const struct ieee80211_reg_rule **reg_rule)
+int freq_reg_info(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 desired_bw_khz,
+ const struct ieee80211_reg_rule **reg_rule)
{
- return freq_reg_info_regd(wiphy, center_freq,
- bandwidth, reg_rule, NULL);
+ assert_cfg80211_lock();
+ return freq_reg_info_regd(wiphy,
+ center_freq,
+ desired_bw_khz,
+ reg_rule,
+ NULL);
}
+/*
+ * Note that right now we assume the desired channel bandwidth
+ * is always 20 MHz for each individual channel (HT40 uses 20 MHz
+ * per channel, the primary and the extension channel). To support
+ * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
+ * new ieee80211_channel.target_bw and re run the regulatory check
+ * on the wiphy with the target_bw specified. Then we can simply use
+ * that below for the desired_bw_khz below.
+ */
static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
unsigned int chan_idx)
{
int r;
- u32 flags;
- u32 max_bandwidth = 0;
+ u32 flags, bw_flags = 0;
+ u32 desired_bw_khz = MHZ_TO_KHZ(20);
const struct ieee80211_reg_rule *reg_rule = NULL;
const struct ieee80211_power_rule *power_rule = NULL;
+ const struct ieee80211_freq_range *freq_range = NULL;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
struct wiphy *request_wiphy = NULL;
flags = chan->orig_flags;
- r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
- &max_bandwidth, ®_rule);
+ r = freq_reg_info(wiphy,
+ MHZ_TO_KHZ(chan->center_freq),
+ desired_bw_khz,
+ ®_rule);
if (r) {
/*
* 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 "
+ last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ REG_DBG_PRINT("cfg80211: Leaving channel %d MHz "
"intact on %s - no rule found in band on "
"Country IE\n",
- chan->center_freq, wiphy_name(wiphy));
-#endif
+ chan->center_freq, wiphy_name(wiphy));
} 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 "
+ if (last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE)
+ REG_DBG_PRINT("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;
}
}
power_rule = ®_rule->power_rule;
+ freq_range = ®_rule->freq_range;
+
+ if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
+ bw_flags = IEEE80211_CHAN_NO_HT40;
- if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
request_wiphy && request_wiphy == wiphy &&
- request_wiphy->strict_regulatory) {
+ request_wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {
/*
* This gaurantees the driver's requested regulatory domain
* will always be used as a base for further regulatory
* settings
*/
chan->flags = chan->orig_flags =
- map_regdom_flags(reg_rule->flags);
+ map_regdom_flags(reg_rule->flags) | bw_flags;
chan->max_antenna_gain = chan->orig_mag =
(int) MBI_TO_DBI(power_rule->max_antenna_gain);
- chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
chan->max_power = chan->orig_mpwr =
(int) MBM_TO_DBM(power_rule->max_eirp);
return;
}
- chan->flags = flags | map_regdom_flags(reg_rule->flags);
+ chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
chan->max_antenna_gain = min(chan->orig_mag,
(int) MBI_TO_DBI(power_rule->max_antenna_gain));
- chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
if (chan->orig_mpwr)
chan->max_power = min(chan->orig_mpwr,
(int) MBM_TO_DBM(power_rule->max_eirp));
handle_channel(wiphy, band, i);
}
-static bool ignore_reg_update(struct wiphy *wiphy, enum reg_set_by setby)
+static bool ignore_reg_update(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
{
if (!last_request)
return true;
- if (setby == REGDOM_SET_BY_CORE &&
- wiphy->custom_regulatory)
+ if (initiator == NL80211_REGDOM_SET_BY_CORE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
return true;
/*
* wiphy->regd will be set once the device has its own
* desired regulatory domain set
*/
- if (wiphy->strict_regulatory && !wiphy->regd &&
+ if (wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY && !wiphy->regd &&
!is_world_regdom(last_request->alpha2))
return true;
return false;
}
-static void update_all_wiphy_regulatory(enum reg_set_by setby)
+static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
{
- struct cfg80211_registered_device *drv;
+ struct cfg80211_registered_device *rdev;
- list_for_each_entry(drv, &cfg80211_drv_list, list)
- wiphy_update_regulatory(&drv->wiphy, setby);
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+ wiphy_update_regulatory(&rdev->wiphy, initiator);
}
static void handle_reg_beacon(struct wiphy *wiphy,
unsigned int chan_idx,
struct reg_beacon *reg_beacon)
{
-#ifdef CONFIG_CFG80211_REG_DEBUG
-#define REG_DEBUG_BEACON_FLAG(desc) \
- printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
- "frequency: %d MHz (Ch %d) on %s\n", \
- reg_beacon->chan.center_freq, \
- ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
- wiphy_name(wiphy));
-#else
-#define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
-#endif
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
+ bool channel_changed = false;
+ struct ieee80211_channel chan_before;
assert_cfg80211_lock();
if (likely(chan->center_freq != reg_beacon->chan.center_freq))
return;
+ if (chan->beacon_found)
+ return;
+
+ chan->beacon_found = true;
+
+ if (wiphy->flags & WIPHY_FLAG_DISABLE_BEACON_HINTS)
+ return;
+
+ chan_before.center_freq = chan->center_freq;
+ chan_before.flags = chan->flags;
+
if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) {
chan->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
- REG_DEBUG_BEACON_FLAG("active scanning");
+ channel_changed = true;
}
if (chan->flags & IEEE80211_CHAN_NO_IBSS) {
chan->flags &= ~IEEE80211_CHAN_NO_IBSS;
- REG_DEBUG_BEACON_FLAG("beaconing");
+ channel_changed = true;
}
- chan->beacon_found = true;
-#undef REG_DEBUG_BEACON_FLAG
+ if (channel_changed)
+ nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
}
/*
if (is_world_regdom(cfg80211_regdomain->alpha2) ||
(wiphy->regd && is_world_regdom(wiphy->regd->alpha2)))
return true;
- if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE &&
- wiphy->custom_regulatory)
+ if (last_request &&
+ last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy->flags & WIPHY_FLAG_CUSTOM_REGULATORY)
return true;
return false;
}
/* Reap the advantages of previously found beacons */
static void reg_process_beacons(struct wiphy *wiphy)
{
+ /*
+ * Means we are just firing up cfg80211, so no beacons would
+ * have been processed yet.
+ */
+ if (!last_request)
+ return;
if (!reg_is_world_roaming(wiphy))
return;
wiphy_update_beacon_reg(wiphy);
}
-void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
+static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
+{
+ if (!chan)
+ return true;
+ if (chan->flags & IEEE80211_CHAN_DISABLED)
+ return true;
+ /* This would happen when regulatory rules disallow HT40 completely */
+ if (IEEE80211_CHAN_NO_HT40 == (chan->flags & (IEEE80211_CHAN_NO_HT40)))
+ return true;
+ return false;
+}
+
+static void reg_process_ht_flags_channel(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ unsigned int chan_idx)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *channel;
+ struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
+ unsigned int i;
+
+ assert_cfg80211_lock();
+
+ sband = wiphy->bands[band];
+ BUG_ON(chan_idx >= sband->n_channels);
+ channel = &sband->channels[chan_idx];
+
+ if (is_ht40_not_allowed(channel)) {
+ channel->flags |= IEEE80211_CHAN_NO_HT40;
+ return;
+ }
+
+ /*
+ * We need to ensure the extension channels exist to
+ * be able to use HT40- or HT40+, this finds them (or not)
+ */
+ for (i = 0; i < sband->n_channels; i++) {
+ struct ieee80211_channel *c = &sband->channels[i];
+ if (c->center_freq == (channel->center_freq - 20))
+ channel_before = c;
+ if (c->center_freq == (channel->center_freq + 20))
+ channel_after = c;
+ }
+
+ /*
+ * Please note that this assumes target bandwidth is 20 MHz,
+ * if that ever changes we also need to change the below logic
+ * to include that as well.
+ */
+ if (is_ht40_not_allowed(channel_before))
+ channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
+
+ if (is_ht40_not_allowed(channel_after))
+ channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
+}
+
+static void reg_process_ht_flags_band(struct wiphy *wiphy,
+ enum ieee80211_band band)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ BUG_ON(!wiphy->bands[band]);
+ sband = wiphy->bands[band];
+
+ for (i = 0; i < sband->n_channels; i++)
+ reg_process_ht_flags_channel(wiphy, band, i);
+}
+
+static void reg_process_ht_flags(struct wiphy *wiphy)
{
enum ieee80211_band band;
- if (ignore_reg_update(wiphy, setby))
+ if (!wiphy)
+ return;
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ if (wiphy->bands[band])
+ reg_process_ht_flags_band(wiphy, band);
+ }
+
+}
+
+void wiphy_update_regulatory(struct wiphy *wiphy,
+ enum nl80211_reg_initiator initiator)
+{
+ enum ieee80211_band band;
+
+ if (ignore_reg_update(wiphy, initiator))
goto out;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (wiphy->bands[band])
}
out:
reg_process_beacons(wiphy);
+ reg_process_ht_flags(wiphy);
if (wiphy->reg_notifier)
wiphy->reg_notifier(wiphy, last_request);
}
const struct ieee80211_regdomain *regd)
{
int r;
- u32 max_bandwidth = 0;
+ u32 desired_bw_khz = MHZ_TO_KHZ(20);
+ u32 bw_flags = 0;
const struct ieee80211_reg_rule *reg_rule = NULL;
const struct ieee80211_power_rule *power_rule = NULL;
+ const struct ieee80211_freq_range *freq_range = NULL;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
+ assert_reg_lock();
+
sband = wiphy->bands[band];
BUG_ON(chan_idx >= sband->n_channels);
chan = &sband->channels[chan_idx];
- r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
- &max_bandwidth, ®_rule, regd);
+ r = freq_reg_info_regd(wiphy,
+ MHZ_TO_KHZ(chan->center_freq),
+ desired_bw_khz,
+ ®_rule,
+ regd);
if (r) {
chan->flags = IEEE80211_CHAN_DISABLED;
}
power_rule = ®_rule->power_rule;
+ freq_range = ®_rule->freq_range;
+
+ if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40))
+ bw_flags = IEEE80211_CHAN_NO_HT40;
- chan->flags |= map_regdom_flags(reg_rule->flags);
+ chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
- chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
}
const struct ieee80211_regdomain *regd)
{
enum ieee80211_band band;
+ unsigned int bands_set = 0;
+
+ mutex_lock(®_mutex);
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
- if (wiphy->bands[band])
- handle_band_custom(wiphy, band, regd);
+ if (!wiphy->bands[band])
+ continue;
+ handle_band_custom(wiphy, band, regd);
+ bands_set++;
}
-}
-EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
-
-static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
- const struct ieee80211_regdomain *src_regd)
-{
- struct ieee80211_regdomain *regd;
- int size_of_regd = 0;
- unsigned int i;
-
- size_of_regd = sizeof(struct ieee80211_regdomain) +
- ((src_regd->n_reg_rules + 1) * sizeof(struct ieee80211_reg_rule));
-
- regd = kzalloc(size_of_regd, GFP_KERNEL);
- if (!regd)
- return -ENOMEM;
-
- memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
-
- for (i = 0; i < src_regd->n_reg_rules; i++)
- memcpy(®d->reg_rules[i], &src_regd->reg_rules[i],
- sizeof(struct ieee80211_reg_rule));
+ mutex_unlock(®_mutex);
- *dst_regd = regd;
- return 0;
+ /*
+ * no point in calling this if it won't have any effect
+ * on your device's supportd bands.
+ */
+ WARN_ON(!bands_set);
}
+EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
/*
* Return value which can be used by ignore_request() to indicate
/* 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)
+static int ignore_request(struct wiphy *wiphy,
+ struct regulatory_request *pending_request)
{
struct wiphy *last_wiphy = NULL;
if (!last_request)
return 0;
- switch (set_by) {
- case REGDOM_SET_BY_INIT:
- return -EINVAL;
- case REGDOM_SET_BY_CORE:
- return -EINVAL;
- case REGDOM_SET_BY_COUNTRY_IE:
+ switch (pending_request->initiator) {
+ case NL80211_REGDOM_SET_BY_CORE:
+ return 0;
+ case NL80211_REGDOM_SET_BY_COUNTRY_IE:
last_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
- if (unlikely(!is_an_alpha2(alpha2)))
+ if (unlikely(!is_an_alpha2(pending_request->alpha2)))
return -EINVAL;
- if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
+ if (last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE) {
if (last_wiphy != wiphy) {
/*
* Two cards with two APs claiming different
- * different Country IE alpha2s. We could
+ * Country IE alpha2s. We could
* intersect them, but that seems unlikely
* to be correct. Reject second one for now.
*/
- if (regdom_changes(alpha2))
+ if (regdom_changes(pending_request->alpha2))
return -EOPNOTSUPP;
return -EALREADY;
}
* Two consecutive Country IE hints on the same wiphy.
* This should be picked up early by the driver/stack
*/
- if (WARN_ON(regdom_changes(alpha2)))
+ if (WARN_ON(regdom_changes(pending_request->alpha2)))
return 0;
return -EALREADY;
}
return REG_INTERSECT;
- case REGDOM_SET_BY_DRIVER:
- if (last_request->initiator == REGDOM_SET_BY_CORE) {
- if (is_old_static_regdom(cfg80211_regdomain))
- return 0;
- if (regdom_changes(alpha2))
+ case NL80211_REGDOM_SET_BY_DRIVER:
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE) {
+ if (regdom_changes(pending_request->alpha2))
return 0;
return -EALREADY;
}
* back in or if you add a new device for which the previously
* loaded card also agrees on the regulatory domain.
*/
- if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
- !regdom_changes(alpha2))
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
+ !regdom_changes(pending_request->alpha2))
return -EALREADY;
return REG_INTERSECT;
- case REGDOM_SET_BY_USER:
- if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
+ case NL80211_REGDOM_SET_BY_USER:
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
return REG_INTERSECT;
/*
* If the user knows better the user should set the regdom
* to their country before the IE is picked up
*/
- if (last_request->initiator == REGDOM_SET_BY_USER &&
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_USER &&
last_request->intersect)
return -EOPNOTSUPP;
/*
* Process user requests only after previous user/driver/core
* requests have been processed
*/
- if (last_request->initiator == REGDOM_SET_BY_CORE ||
- last_request->initiator == REGDOM_SET_BY_DRIVER ||
- last_request->initiator == REGDOM_SET_BY_USER) {
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_CORE ||
+ last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
+ last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
if (regdom_changes(last_request->alpha2))
return -EAGAIN;
}
- if (!is_old_static_regdom(cfg80211_regdomain) &&
- !regdom_changes(alpha2))
+ if (!regdom_changes(pending_request->alpha2))
return -EALREADY;
return 0;
* __regulatory_hint - hint to the wireless core a regulatory domain
* @wiphy: if the hint comes from country information from an AP, this
* is required to be set to the wiphy that received the information
- * @alpha2: the ISO/IEC 3166 alpha2 being claimed the regulatory domain
- * should be in.
- * @country_ie_checksum: checksum of processed country IE, set this to 0
- * if the hint did not come from a country IE
- * @country_ie_env: the environment the IE told us we are in, %ENVIRON_*
+ * @pending_request: the regulatory request currently being processed
*
* The Wireless subsystem can use this function to hint to the wireless core
- * what it believes should be the current regulatory domain by giving it an
- * ISO/IEC 3166 alpha2 country code it knows its regulatory domain should be
- * in.
+ * what it believes should be the current regulatory domain.
*
* Returns zero if all went fine, %-EALREADY if a regulatory domain had
* already been set or other standard error codes.
*
- * Caller must hold &cfg80211_mutex
+ * Caller must hold &cfg80211_mutex and ®_mutex
*/
-static int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
- const char *alpha2,
- u32 country_ie_checksum,
- enum environment_cap env)
+static int __regulatory_hint(struct wiphy *wiphy,
+ struct regulatory_request *pending_request)
{
- struct regulatory_request *request;
bool intersect = false;
int r = 0;
assert_cfg80211_lock();
- r = ignore_request(wiphy, set_by, alpha2);
+ r = ignore_request(wiphy, pending_request);
if (r == REG_INTERSECT) {
- if (set_by == REGDOM_SET_BY_DRIVER) {
+ if (pending_request->initiator ==
+ NL80211_REGDOM_SET_BY_DRIVER) {
r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
- if (r)
+ if (r) {
+ kfree(pending_request);
return r;
+ }
}
intersect = true;
} else if (r) {
* driver has already been set just copy it to the
* wiphy
*/
- if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
+ if (r == -EALREADY &&
+ pending_request->initiator ==
+ NL80211_REGDOM_SET_BY_DRIVER) {
r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
- if (r)
+ if (r) {
+ kfree(pending_request);
return r;
+ }
r = -EALREADY;
goto new_request;
}
+ kfree(pending_request);
return r;
}
new_request:
- request = kzalloc(sizeof(struct regulatory_request),
- GFP_KERNEL);
- if (!request)
- return -ENOMEM;
+ kfree(last_request);
- request->alpha2[0] = alpha2[0];
- request->alpha2[1] = alpha2[1];
- request->initiator = set_by;
- request->wiphy_idx = get_wiphy_idx(wiphy);
- request->intersect = intersect;
- request->country_ie_checksum = country_ie_checksum;
- request->country_ie_env = env;
+ last_request = pending_request;
+ last_request->intersect = intersect;
- kfree(last_request);
- last_request = request;
+ pending_request = NULL;
+
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_USER) {
+ user_alpha2[0] = last_request->alpha2[0];
+ user_alpha2[1] = last_request->alpha2[1];
+ }
/* When r == REG_INTERSECT we do need to call CRDA */
- if (r < 0)
+ if (r < 0) {
+ /*
+ * Since CRDA will not be called in this case as we already
+ * have applied the requested regulatory domain before we just
+ * inform userspace we have processed the request
+ */
+ if (r == -EALREADY)
+ nl80211_send_reg_change_event(last_request);
return r;
+ }
- /*
- * 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
- */
- return call_crda(alpha2);
+ return call_crda(last_request->alpha2);
}
-/* This currently only processes user and driver regulatory hints */
-static int reg_process_hint(struct regulatory_request *reg_request)
+/* This processes *all* regulatory hints */
+static void reg_process_hint(struct regulatory_request *reg_request)
{
int r = 0;
struct wiphy *wiphy = NULL;
BUG_ON(!reg_request->alpha2);
mutex_lock(&cfg80211_mutex);
+ mutex_lock(®_mutex);
if (wiphy_idx_valid(reg_request->wiphy_idx))
wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
- if (reg_request->initiator == REGDOM_SET_BY_DRIVER &&
+ if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
!wiphy) {
- r = -ENODEV;
+ kfree(reg_request);
goto out;
}
- r = __regulatory_hint(wiphy,
- reg_request->initiator,
- reg_request->alpha2,
- reg_request->country_ie_checksum,
- reg_request->country_ie_env);
+ r = __regulatory_hint(wiphy, reg_request);
/* This is required so that the orig_* parameters are saved */
- if (r == -EALREADY && wiphy && wiphy->strict_regulatory)
+ if (r == -EALREADY && wiphy &&
+ wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
wiphy_update_regulatory(wiphy, reg_request->initiator);
out:
+ mutex_unlock(®_mutex);
mutex_unlock(&cfg80211_mutex);
-
- if (r == -EALREADY)
- r = 0;
-
- return r;
}
-/* Processes regulatory hints, this is all the REGDOM_SET_BY_* */
+/* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
static void reg_process_pending_hints(void)
{
struct regulatory_request *reg_request;
- int r;
spin_lock(®_requests_lock);
while (!list_empty(®_requests_list)) {
struct regulatory_request,
list);
list_del_init(®_request->list);
- spin_unlock(®_requests_lock);
- r = reg_process_hint(reg_request);
-#ifdef CONFIG_CFG80211_REG_DEBUG
- if (r && (reg_request->initiator == REGDOM_SET_BY_DRIVER ||
- reg_request->initiator == REGDOM_SET_BY_COUNTRY_IE))
- printk(KERN_ERR "cfg80211: wiphy_idx %d sent a "
- "regulatory hint for %c%c but now has "
- "gone fishing, ignoring request\n",
- reg_request->wiphy_idx,
- reg_request->alpha2[0],
- reg_request->alpha2[1]);
-#endif
- kfree(reg_request);
+ spin_unlock(®_requests_lock);
+ reg_process_hint(reg_request);
spin_lock(®_requests_lock);
}
spin_unlock(®_requests_lock);
/* Processes beacon hints -- this has nothing to do with country IEs */
static void reg_process_pending_beacon_hints(void)
{
- struct cfg80211_registered_device *drv;
+ struct cfg80211_registered_device *rdev;
struct reg_beacon *pending_beacon, *tmp;
+ /*
+ * No need to hold the reg_mutex here as we just touch wiphys
+ * and do not read or access regulatory variables.
+ */
mutex_lock(&cfg80211_mutex);
/* This goes through the _pending_ beacon list */
list_del_init(&pending_beacon->list);
/* Applies the beacon hint to current wiphys */
- list_for_each_entry(drv, &cfg80211_drv_list, list)
- wiphy_update_new_beacon(&drv->wiphy, pending_beacon);
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list)
+ wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
/* Remembers the beacon hint for new wiphys or reg changes */
list_add_tail(&pending_beacon->list, ®_beacon_list);
schedule_work(®_work);
}
-/* Core regulatory hint -- happens once during cfg80211_init() */
+/*
+ * Core regulatory hint -- happens during cfg80211_init()
+ * and when we restore regulatory settings.
+ */
static int regulatory_hint_core(const char *alpha2)
{
struct regulatory_request *request;
- BUG_ON(last_request);
+ kfree(last_request);
+ last_request = NULL;
request = kzalloc(sizeof(struct regulatory_request),
GFP_KERNEL);
request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1];
- request->initiator = REGDOM_SET_BY_CORE;
+ request->initiator = NL80211_REGDOM_SET_BY_CORE;
- queue_regulatory_request(request);
+ /*
+ * This ensures last_request is populated once modules
+ * come swinging in and calling regulatory hints and
+ * wiphy_apply_custom_regulatory().
+ */
+ reg_process_hint(request);
return 0;
}
request->wiphy_idx = WIPHY_IDX_STALE;
request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1];
- request->initiator = REGDOM_SET_BY_USER,
+ request->initiator = NL80211_REGDOM_SET_BY_USER;
queue_regulatory_request(request);
request->alpha2[0] = alpha2[0];
request->alpha2[1] = alpha2[1];
- request->initiator = REGDOM_SET_BY_DRIVER;
+ request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
queue_regulatory_request(request);
}
EXPORT_SYMBOL(regulatory_hint);
+/* Caller must hold reg_mutex */
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
u32 country_ie_checksum)
{
struct wiphy *request_wiphy;
- assert_cfg80211_lock();
+ assert_reg_lock();
+
+ if (unlikely(last_request->initiator !=
+ NL80211_REGDOM_SET_BY_COUNTRY_IE))
+ return false;
request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
return false;
}
+/*
+ * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
+ * therefore cannot iterate over the rdev list here.
+ */
void regulatory_hint_11d(struct wiphy *wiphy,
- u8 *country_ie,
- u8 country_ie_len)
+ enum ieee80211_band band,
+ u8 *country_ie,
+ u8 country_ie_len)
{
struct ieee80211_regdomain *rd = NULL;
char alpha2[2];
enum environment_cap env = ENVIRON_ANY;
struct regulatory_request *request;
- mutex_lock(&cfg80211_mutex);
+ mutex_lock(®_mutex);
- if (unlikely(!last_request)) {
- mutex_unlock(&cfg80211_mutex);
- return;
- }
+ if (unlikely(!last_request))
+ goto out;
/* IE len must be evenly divisible by 2 */
if (country_ie_len & 0x01)
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
+ * We will run this only upon a successful connection on cfg80211.
+ * We leave conflict resolution to the workqueue, where can hold
+ * cfg80211_mutex.
*/
- if (likely(wiphy_idx_valid(last_request->wiphy_idx))) {
- struct cfg80211_registered_device *drv_last_ie;
-
- drv_last_ie =
- cfg80211_drv_by_wiphy_idx(last_request->wiphy_idx);
-
- /*
- * Lets keep this simple -- we trust the first AP
- * after we intersect with CRDA
- */
- if (likely(&drv_last_ie->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;
- }
- }
+ if (likely(last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE &&
+ wiphy_idx_valid(last_request->wiphy_idx)))
+ goto out;
- rd = country_ie_2_rd(country_ie, country_ie_len, &checksum);
- if (!rd)
+ rd = country_ie_2_rd(band, country_ie, country_ie_len, &checksum);
+ if (!rd) {
+ REG_DBG_PRINT("cfg80211: Ignoring bogus country IE\n");
goto out;
+ }
/*
* This will not happen right now but we leave it here for the
request->wiphy_idx = get_wiphy_idx(wiphy);
request->alpha2[0] = rd->alpha2[0];
request->alpha2[1] = rd->alpha2[1];
- request->initiator = REGDOM_SET_BY_COUNTRY_IE;
+ request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
request->country_ie_checksum = checksum;
request->country_ie_env = env;
- mutex_unlock(&cfg80211_mutex);
+ mutex_unlock(®_mutex);
queue_regulatory_request(request);
free_rd_out:
kfree(rd);
out:
+ mutex_unlock(®_mutex);
+}
+
+static void restore_alpha2(char *alpha2, bool reset_user)
+{
+ /* indicates there is no alpha2 to consider for restoration */
+ alpha2[0] = '9';
+ alpha2[1] = '7';
+
+ /* The user setting has precedence over the module parameter */
+ if (is_user_regdom_saved()) {
+ /* Unless we're asked to ignore it and reset it */
+ if (reset_user) {
+ REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
+ "including user preference\n");
+ user_alpha2[0] = '9';
+ user_alpha2[1] = '7';
+
+ /*
+ * If we're ignoring user settings, we still need to
+ * check the module parameter to ensure we put things
+ * back as they were for a full restore.
+ */
+ if (!is_world_regdom(ieee80211_regdom)) {
+ REG_DBG_PRINT("cfg80211: Keeping preference on "
+ "module parameter ieee80211_regdom: %c%c\n",
+ ieee80211_regdom[0],
+ ieee80211_regdom[1]);
+ alpha2[0] = ieee80211_regdom[0];
+ alpha2[1] = ieee80211_regdom[1];
+ }
+ } else {
+ REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
+ "while preserving user preference for: %c%c\n",
+ user_alpha2[0],
+ user_alpha2[1]);
+ alpha2[0] = user_alpha2[0];
+ alpha2[1] = user_alpha2[1];
+ }
+ } else if (!is_world_regdom(ieee80211_regdom)) {
+ REG_DBG_PRINT("cfg80211: Keeping preference on "
+ "module parameter ieee80211_regdom: %c%c\n",
+ ieee80211_regdom[0],
+ ieee80211_regdom[1]);
+ alpha2[0] = ieee80211_regdom[0];
+ alpha2[1] = ieee80211_regdom[1];
+ } else
+ REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
+}
+
+/*
+ * Restoring regulatory settings involves ingoring any
+ * possibly stale country IE information and user regulatory
+ * settings if so desired, this includes any beacon hints
+ * learned as we could have traveled outside to another country
+ * after disconnection. To restore regulatory settings we do
+ * exactly what we did at bootup:
+ *
+ * - send a core regulatory hint
+ * - send a user regulatory hint if applicable
+ *
+ * Device drivers that send a regulatory hint for a specific country
+ * keep their own regulatory domain on wiphy->regd so that does does
+ * not need to be remembered.
+ */
+static void restore_regulatory_settings(bool reset_user)
+{
+ char alpha2[2];
+ struct reg_beacon *reg_beacon, *btmp;
+
+ mutex_lock(&cfg80211_mutex);
+ mutex_lock(®_mutex);
+
+ reset_regdomains();
+ restore_alpha2(alpha2, reset_user);
+
+ /* Clear beacon hints */
+ spin_lock_bh(®_pending_beacons_lock);
+ if (!list_empty(®_pending_beacons)) {
+ list_for_each_entry_safe(reg_beacon, btmp,
+ ®_pending_beacons, list) {
+ list_del(®_beacon->list);
+ kfree(reg_beacon);
+ }
+ }
+ spin_unlock_bh(®_pending_beacons_lock);
+
+ if (!list_empty(®_beacon_list)) {
+ list_for_each_entry_safe(reg_beacon, btmp,
+ ®_beacon_list, list) {
+ list_del(®_beacon->list);
+ kfree(reg_beacon);
+ }
+ }
+
+ /* First restore to the basic regulatory settings */
+ cfg80211_regdomain = cfg80211_world_regdom;
+
+ mutex_unlock(®_mutex);
mutex_unlock(&cfg80211_mutex);
+
+ regulatory_hint_core(cfg80211_regdomain->alpha2);
+
+ /*
+ * This restores the ieee80211_regdom module parameter
+ * preference or the last user requested regulatory
+ * settings, user regulatory settings takes precedence.
+ */
+ if (is_an_alpha2(alpha2))
+ regulatory_hint_user(user_alpha2);
+}
+
+
+void regulatory_hint_disconnect(void)
+{
+ REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
+ "restore regulatory settings\n");
+ restore_regulatory_settings(false);
}
-EXPORT_SYMBOL(regulatory_hint_11d);
static bool freq_is_chan_12_13_14(u16 freq)
{
if (!reg_beacon)
return -ENOMEM;
-#ifdef CONFIG_CFG80211_REG_DEBUG
- printk(KERN_DEBUG "cfg80211: Found new beacon on "
- "frequency: %d MHz (Ch %d) on %s\n",
- beacon_chan->center_freq,
- ieee80211_frequency_to_channel(beacon_chan->center_freq),
- wiphy_name(wiphy));
-#endif
+ REG_DBG_PRINT("cfg80211: Found new beacon on "
+ "frequency: %d MHz (Ch %d) on %s\n",
+ beacon_chan->center_freq,
+ ieee80211_frequency_to_channel(beacon_chan->center_freq),
+ wiphy_name(wiphy));
+
memcpy(®_beacon->chan, beacon_chan,
sizeof(struct ieee80211_channel));
const struct ieee80211_freq_range *freq_range = NULL;
const struct ieee80211_power_rule *power_rule = NULL;
- printk(KERN_INFO "\t(start_freq - end_freq @ bandwidth), "
+ printk(KERN_INFO " (start_freq - end_freq @ bandwidth), "
"(max_antenna_gain, max_eirp)\n");
for (i = 0; i < rd->n_reg_rules; i++) {
* in certain regions
*/
if (power_rule->max_antenna_gain)
- printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
+ printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
"(%d mBi, %d mBm)\n",
freq_range->start_freq_khz,
freq_range->end_freq_khz,
power_rule->max_antenna_gain,
power_rule->max_eirp);
else
- printk(KERN_INFO "\t(%d KHz - %d KHz @ %d KHz), "
+ printk(KERN_INFO " (%d KHz - %d KHz @ %d KHz), "
"(N/A, %d mBm)\n",
freq_range->start_freq_khz,
freq_range->end_freq_khz,
if (is_intersected_alpha2(rd->alpha2)) {
- if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE) {
- struct cfg80211_registered_device *drv;
- drv = cfg80211_drv_by_wiphy_idx(
+ if (last_request->initiator ==
+ NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+ struct cfg80211_registered_device *rdev;
+ rdev = cfg80211_rdev_by_wiphy_idx(
last_request->wiphy_idx);
- if (drv) {
+ if (rdev) {
printk(KERN_INFO "cfg80211: Current regulatory "
"domain updated by AP to: %c%c\n",
- drv->country_ie_alpha2[0],
- drv->country_ie_alpha2[1]);
+ rdev->country_ie_alpha2[0],
+ rdev->country_ie_alpha2[1]);
} else
printk(KERN_INFO "cfg80211: Current regulatory "
"domain intersected: \n");
static int __set_regdom(const struct ieee80211_regdomain *rd)
{
const struct ieee80211_regdomain *intersected_rd = NULL;
- struct cfg80211_registered_device *drv = NULL;
+ struct cfg80211_registered_device *rdev = NULL;
struct wiphy *request_wiphy;
/* Some basic sanity checks first */
* 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 (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
/*
* If someone else asked us to change the rd lets only bother
* checking if the alpha2 changes if CRDA was already called
*/
- if (!is_old_static_regdom(cfg80211_regdomain) &&
- !regdom_changes(rd->alpha2))
+ if (!regdom_changes(rd->alpha2))
return -EINVAL;
}
if (!last_request->intersect) {
int r;
- if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
+ if (last_request->initiator != NL80211_REGDOM_SET_BY_DRIVER) {
reset_regdomains();
cfg80211_regdomain = rd;
return 0;
* driver wanted to the wiphy to deal with conflicts
*/
- BUG_ON(request_wiphy->regd);
+ /*
+ * Userspace could have sent two replies with only
+ * one kernel request.
+ */
+ if (request_wiphy->regd)
+ return -EALREADY;
r = reg_copy_regd(&request_wiphy->regd, rd);
if (r)
/* Intersection requires a bit more work */
- if (last_request->initiator != REGDOM_SET_BY_COUNTRY_IE) {
+ if (last_request->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
if (!intersected_rd)
* However if a driver requested this specific regulatory
* domain we keep it for its private use
*/
- if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+ if (last_request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
request_wiphy->regd = rd;
else
kfree(rd);
* the country IE rd with what CRDA believes that country should have
*/
- BUG_ON(!country_ie_regdomain);
+ /*
+ * Userspace could have sent two replies with only
+ * one kernel request. By the second reply we would have
+ * already processed and consumed the country_ie_regdomain.
+ */
+ if (!country_ie_regdomain)
+ return -EALREADY;
+ BUG_ON(rd == country_ie_regdomain);
- if (rd != country_ie_regdomain) {
- /*
- * Intersect what CRDA returned and our what we
- * had built from the Country IE received
- */
+ /*
+ * Intersect what CRDA returned and our what we
+ * had built from the Country IE received
+ */
- intersected_rd = regdom_intersect(rd, country_ie_regdomain);
+ intersected_rd = regdom_intersect(rd, country_ie_regdomain);
- reg_country_ie_process_debug(rd, country_ie_regdomain,
- intersected_rd);
+ 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);
- }
+ kfree(country_ie_regdomain);
+ country_ie_regdomain = NULL;
if (!intersected_rd)
return -EINVAL;
- drv = wiphy_to_dev(request_wiphy);
+ rdev = wiphy_to_dev(request_wiphy);
- drv->country_ie_alpha2[0] = rd->alpha2[0];
- drv->country_ie_alpha2[1] = rd->alpha2[1];
- drv->env = last_request->country_ie_env;
+ rdev->country_ie_alpha2[0] = rd->alpha2[0];
+ rdev->country_ie_alpha2[1] = rd->alpha2[1];
+ rdev->env = last_request->country_ie_env;
BUG_ON(intersected_rd == rd);
assert_cfg80211_lock();
+ mutex_lock(®_mutex);
+
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
if (r) {
kfree(rd);
+ mutex_unlock(®_mutex);
return r;
}
print_regdomain(cfg80211_regdomain);
+ nl80211_send_reg_change_event(last_request);
+
+ mutex_unlock(®_mutex);
+
return r;
}
/* Caller must hold cfg80211_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
- struct wiphy *request_wiphy;
+ struct wiphy *request_wiphy = NULL;
assert_cfg80211_lock();
- request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+ mutex_lock(®_mutex);
kfree(wiphy->regd);
- if (!last_request || !request_wiphy)
- return;
- if (request_wiphy != wiphy)
- return;
+
+ if (last_request)
+ request_wiphy = wiphy_idx_to_wiphy(last_request->wiphy_idx);
+
+ if (!request_wiphy || request_wiphy != wiphy)
+ goto out;
+
last_request->wiphy_idx = WIPHY_IDX_STALE;
last_request->country_ie_env = ENVIRON_ANY;
+out:
+ mutex_unlock(®_mutex);
}
int regulatory_init(void)
spin_lock_init(®_requests_lock);
spin_lock_init(®_pending_beacons_lock);
-#ifdef CONFIG_WIRELESS_OLD_REGULATORY
- cfg80211_regdomain = static_regdom(ieee80211_regdom);
-
- printk(KERN_INFO "cfg80211: Using static regulatory domain info\n");
- print_regdomain_info(cfg80211_regdomain);
- /*
- * The old code still requests for a new regdomain and if
- * you have CRDA you get it updated, otherwise you get
- * stuck with the static values. We ignore "EU" code as
- * that is not a valid ISO / IEC 3166 alpha2
- */
- if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
- err = regulatory_hint_core(ieee80211_regdom);
-#else
cfg80211_regdomain = cfg80211_world_regdom;
- err = regulatory_hint_core("00");
-#endif
+ user_alpha2[0] = '9';
+ user_alpha2[1] = '7';
+
+ /* We always try to get an update for the static regdomain */
+ err = regulatory_hint_core(cfg80211_regdomain->alpha2);
if (err) {
if (err == -ENOMEM)
return err;
#endif
}
+ /*
+ * Finally, if the user set the module parameter treat it
+ * as a user hint.
+ */
+ if (!is_world_regdom(ieee80211_regdom))
+ regulatory_hint_user(ieee80211_regdom);
+
return 0;
}
cancel_work_sync(®_work);
mutex_lock(&cfg80211_mutex);
+ mutex_lock(®_mutex);
reset_regdomains();
}
spin_unlock(®_requests_lock);
+ mutex_unlock(®_mutex);
mutex_unlock(&cfg80211_mutex);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff