#include "core.h"
#include "reg.h"
-/**
- * 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.
- * @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
- */
-struct regulatory_request {
- struct wiphy *wiphy;
- enum reg_set_by initiator;
- char alpha2[2];
- bool intersect;
- u32 country_ie_checksum;
- enum environment_cap country_ie_env;
-};
-
/* Receipt of information from last regulatory request */
static struct regulatory_request *last_request;
return 0;
}
+/**
+ * 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
+}
+
/* 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
* calculate the number of reg rules we will need. We will need one
* for each channel subband */
while (country_ie_len >= 3) {
+ int end_channel = 0;
struct ieee80211_country_ie_triplet *triplet =
(struct ieee80211_country_ie_triplet *) country_ie;
int cur_sub_max_channel = 0, cur_channel = 0;
continue;
}
+ /* 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));
+
cur_channel = triplet->chans.first_channel;
- cur_sub_max_channel = ieee80211_channel_to_frequency(
- cur_channel + triplet->chans.num_channels);
+ cur_sub_max_channel = end_channel;
/* Basic sanity check */
if (cur_sub_max_channel < cur_channel)
/* This time around we fill in the rd */
while (country_ie_len >= 3) {
+ int end_channel = 0;
struct ieee80211_country_ie_triplet *triplet =
(struct ieee80211_country_ie_triplet *) country_ie;
struct ieee80211_reg_rule *reg_rule = NULL;
reg_rule->flags = flags;
+ /* 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));
+
/* 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
triplet->chans.first_channel) - 10);
freq_range->end_freq_khz =
MHZ_TO_KHZ(ieee80211_channel_to_frequency(
- triplet->chans.first_channel +
- triplet->chans.num_channels) + 10);
+ end_channel) + 10);
/* Large arbitrary values, we intersect later */
/* Increment this if we ever support >= 40 MHz channels
return channel_flags;
}
-/**
- * freq_reg_info - get regulatory information for the given frequency
- * @center_freq: Frequency in KHz for which we want regulatory information for
- * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
- * you can set this to 0. If this frequency is allowed we then set
- * this value to the maximum allowed bandwidth.
- * @reg_rule: the regulatory rule which we have for this frequency
- *
- * Use this function to get the regulatory rule for a specific frequency.
- */
-static int freq_reg_info(u32 center_freq, u32 *bandwidth,
- const struct ieee80211_reg_rule **reg_rule)
+static int freq_reg_info_regd(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 *bandwidth,
+ 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;
- if (!cfg80211_regdomain)
+ 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 &&
+ wiphy->regd)
+ regd = wiphy->regd;
+
+ if (!regd)
return -EINVAL;
- for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {
+ for (i = 0; i < regd->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];
+ rr = ®d->reg_rules[i];
fr = &rr->freq_range;
pr = &rr->power_rule;
+
+ /* 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);
+
max_bandwidth = freq_max_bandwidth(fr, center_freq);
+
if (max_bandwidth && *bandwidth <= max_bandwidth) {
*reg_rule = rr;
*bandwidth = max_bandwidth;
}
}
+ if (!band_rule_found)
+ return -ERANGE;
+
return !max_bandwidth;
}
+EXPORT_SYMBOL(freq_reg_info);
+
+int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
+ const struct ieee80211_reg_rule **reg_rule)
+{
+ return freq_reg_info_regd(wiphy, center_freq,
+ bandwidth, reg_rule, NULL);
+}
-static void handle_channel(struct ieee80211_channel *chan)
+static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
+ unsigned int chan_idx)
{
int r;
- u32 flags = chan->orig_flags;
+ u32 flags;
u32 max_bandwidth = 0;
const struct ieee80211_reg_rule *reg_rule = NULL;
const struct ieee80211_power_rule *power_rule = NULL;
+ 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;
- r = freq_reg_info(MHZ_TO_KHZ(chan->center_freq),
+ r = freq_reg_info(wiphy, MHZ_TO_KHZ(chan->center_freq),
&max_bandwidth, ®_rule);
if (r) {
- flags |= IEEE80211_CHAN_DISABLED;
- chan->flags = flags;
+ /* 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;
+ }
return;
}
power_rule = ®_rule->power_rule;
+ if (last_request->initiator == REGDOM_SET_BY_DRIVER &&
+ last_request->wiphy && last_request->wiphy == wiphy &&
+ last_request->wiphy->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);
+ 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->max_antenna_gain = min(chan->orig_mag,
(int) MBI_TO_DBI(power_rule->max_antenna_gain));
chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
}
-static void handle_band(struct ieee80211_supported_band *sband)
+static void handle_band(struct wiphy *wiphy, enum ieee80211_band band)
{
- int i;
+ 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++)
- handle_channel(&sband->channels[i]);
+ handle_channel(wiphy, band, i);
+}
+
+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->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 &&
+ !is_world_regdom(last_request->alpha2))
+ return true;
+ return false;
}
static void update_all_wiphy_regulatory(enum reg_set_by setby)
void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
{
enum ieee80211_band band;
+
+ if (ignore_reg_update(wiphy, setby))
+ return;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (wiphy->bands[band])
- handle_band(wiphy->bands[band]);
- if (wiphy->reg_notifier)
- wiphy->reg_notifier(wiphy, setby);
+ handle_band(wiphy, band);
}
+ if (wiphy->reg_notifier)
+ wiphy->reg_notifier(wiphy, last_request);
+}
+
+static void handle_channel_custom(struct wiphy *wiphy,
+ enum ieee80211_band band,
+ unsigned int chan_idx,
+ const struct ieee80211_regdomain *regd)
+{
+ int r;
+ u32 max_bandwidth = 0;
+ const struct ieee80211_reg_rule *reg_rule = NULL;
+ const struct ieee80211_power_rule *power_rule = NULL;
+ 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];
+
+ r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
+ &max_bandwidth, ®_rule, regd);
+
+ if (r) {
+ chan->flags = IEEE80211_CHAN_DISABLED;
+ return;
+ }
+
+ power_rule = ®_rule->power_rule;
+
+ chan->flags |= map_regdom_flags(reg_rule->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);
+}
+
+static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
+ const struct ieee80211_regdomain *regd)
+{
+ 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++)
+ handle_channel_custom(wiphy, band, i, regd);
+}
+
+/* Used by drivers prior to wiphy registration */
+void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
+ const struct ieee80211_regdomain *regd)
+{
+ enum ieee80211_band band;
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ if (wiphy->bands[band])
+ handle_band_custom(wiphy, band, regd);
+ }
+}
+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));
+
+ *dst_regd = regd;
+ return 0;
}
/* Return value which can be used by ignore_request() to indicate
}
return REG_INTERSECT;
case REGDOM_SET_BY_DRIVER:
- if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+ if (last_request->initiator == REGDOM_SET_BY_CORE) {
+ if (is_old_static_regdom(cfg80211_regdomain))
+ return 0;
+ if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ return 0;
return -EALREADY;
- return 0;
+ }
+ return REG_INTERSECT;
case REGDOM_SET_BY_USER:
if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
return REG_INTERSECT;
if (last_request->initiator == 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 (!alpha2_equal(last_request->alpha2,
+ cfg80211_regdomain->alpha2))
+ return -EAGAIN;
+ }
+
+ if (!is_old_static_regdom(cfg80211_regdomain) &&
+ alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ return -EALREADY;
+
return 0;
}
r = ignore_request(wiphy, set_by, alpha2);
- if (r == REG_INTERSECT)
+ if (r == REG_INTERSECT) {
+ if (set_by == REGDOM_SET_BY_DRIVER) {
+ r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
+ if (r)
+ return r;
+ }
intersect = true;
- else if (r)
+ } else if (r) {
+ /* If the regulatory domain being requested by the
+ * driver has already been set just copy it to the
+ * wiphy */
+ if (r == -EALREADY && set_by == REGDOM_SET_BY_DRIVER) {
+ r = reg_copy_regd(&wiphy->regd, cfg80211_regdomain);
+ if (r)
+ return r;
+ r = -EALREADY;
+ goto new_request;
+ }
return r;
+ }
+new_request:
request = kzalloc(sizeof(struct regulatory_request),
GFP_KERNEL);
if (!request)
kfree(last_request);
last_request = request;
+
+ /* When r == REG_INTERSECT we do need to call CRDA */
+ if (r < 0)
+ return r;
+
/*
* Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
* AND if CRDA is NOT present nothing will happen, if someone
void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
{
+ int r;
BUG_ON(!alpha2);
mutex_lock(&cfg80211_drv_mutex);
- __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY);
+ r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER,
+ alpha2, 0, ENVIRON_ANY);
+ /* This is required so that the orig_* parameters are saved */
+ if (r == -EALREADY && wiphy->strict_regulatory)
+ wiphy_update_regulatory(wiphy, REGDOM_SET_BY_DRIVER);
mutex_unlock(&cfg80211_drv_mutex);
}
EXPORT_SYMBOL(regulatory_hint);
u32 checksum = 0;
enum environment_cap env = ENVIRON_ANY;
+ if (!last_request)
+ return;
+
mutex_lock(&cfg80211_drv_mutex);
/* IE len must be evenly divisible by 2 */
"domain intersected: \n");
} else
printk(KERN_INFO "cfg80211: Current regulatory "
- "intersected: \n");
+ "domain intersected: \n");
} else if (is_world_regdom(rd->alpha2))
printk(KERN_INFO "cfg80211: World regulatory "
"domain updated:\n");
if (intersected_rd) {
printk(KERN_DEBUG "cfg80211: We intersect both of these "
"and get:\n");
- print_regdomain_info(rd);
+ print_regdomain_info(intersected_rd);
return;
}
printk(KERN_DEBUG "cfg80211: Intersection between both failed\n");
}
if (!last_request->intersect) {
+ int r;
+
+ if (last_request->initiator != REGDOM_SET_BY_DRIVER) {
+ reset_regdomains();
+ cfg80211_regdomain = rd;
+ return 0;
+ }
+
+ /* For a driver hint, lets copy the regulatory domain the
+ * driver wanted to the wiphy to deal with conflicts */
+
+ BUG_ON(last_request->wiphy->regd);
+
+ r = reg_copy_regd(&last_request->wiphy->regd, rd);
+ if (r)
+ return r;
+
reset_regdomains();
cfg80211_regdomain = rd;
return 0;
if (!intersected_rd)
return -EINVAL;
- /* We can trash what CRDA provided now */
- kfree(rd);
+ /* We can trash what CRDA provided now.
+ * However if a driver requested this specific regulatory
+ * domain we keep it for its private use */
+ if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+ last_request->wiphy->regd = rd;
+ else
+ kfree(rd);
+
rd = NULL;
reset_regdomains();
/* Caller must hold cfg80211_drv_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
- if (!last_request->wiphy)
+ kfree(wiphy->regd);
+ if (!last_request || !last_request->wiphy)
return;
if (last_request->wiphy != wiphy)
return;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff