#include "core.h"
#include "reg.h"
-/* wiphy is set if this request's initiator is REGDOM_SET_BY_DRIVER */
+/**
+ * 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 list_head list;
struct wiphy *wiphy;
- int granted;
enum reg_set_by initiator;
char alpha2[2];
+ bool intersect;
+ u32 country_ie_checksum;
+ enum environment_cap country_ie_env;
};
-static LIST_HEAD(regulatory_requests);
-DEFINE_MUTEX(cfg80211_reg_mutex);
+/* Receipt of information from last regulatory request */
+static struct regulatory_request *last_request;
/* To trigger userspace events */
static struct platform_device *reg_pdev;
MHZ_TO_KHZ(20),
};
-static struct list_head regulatory_requests;
-
/* 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 */
static const struct ieee80211_regdomain *cfg80211_regdomain;
+/* 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;
+
/* 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,
* core upon initialization */
static void update_world_regdomain(const struct ieee80211_regdomain *rd)
{
- BUG_ON(list_empty(®ulatory_requests));
+ BUG_ON(!last_request);
reset_regdomains();
return false;
}
+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;
+}
+
static bool is_an_alpha2(const char *alpha2)
{
if (!alpha2)
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
+ *
+ * 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;
+}
+
/* This lets us keep regulatory code which is updated on a regulatory
* basis in userspace. */
static int call_crda(const char *alpha2)
return kobject_uevent_env(®_pdev->dev.kobj, KOBJ_CHANGE, envp);
}
-/* This has the logic which determines when a new request
- * should be ignored. */
-static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
- char *alpha2, struct ieee80211_regdomain *rd)
-{
- struct regulatory_request *last_request = NULL;
-
- /* All initial requests are respected */
- if (list_empty(®ulatory_requests))
- return 0;
-
- last_request = list_first_entry(®ulatory_requests,
- struct regulatory_request, list);
-
- switch (set_by) {
- case REGDOM_SET_BY_INIT:
- return -EINVAL;
- case REGDOM_SET_BY_CORE:
- /* Always respect new wireless core hints, should only
- * come in for updating the world regulatory domain at init
- * anyway */
- return 0;
- case REGDOM_SET_BY_COUNTRY_IE:
- if (last_request->initiator == set_by) {
- if (last_request->wiphy != wiphy) {
- /* Two cards with two APs claiming different
- * different Country IE alpha2s!
- * You're special!! */
- if (!alpha2_equal(last_request->alpha2,
- cfg80211_regdomain->alpha2)) {
- /* XXX: Deal with conflict, consider
- * building a new one out of the
- * intersection */
- WARN_ON(1);
- return -EOPNOTSUPP;
- }
- return -EALREADY;
- }
- /* Two consecutive Country IE hints on the same wiphy */
- if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
- return 0;
- return -EALREADY;
- }
- if (WARN(!is_alpha2_set(alpha2) || !is_an_alpha2(alpha2),
- "Invalid Country IE regulatory hint passed "
- "to the wireless core\n"))
- return -EINVAL;
- /* We ignore Country IE hints for now, as we haven't yet
- * added the dot11MultiDomainCapabilityEnabled flag
- * for wiphys */
- return 1;
- case REGDOM_SET_BY_DRIVER:
- BUG_ON(!wiphy);
- if (last_request->initiator == set_by) {
- /* Two separate drivers hinting different things,
- * this is possible if you have two devices present
- * on a system with different EEPROM regulatory
- * readings. XXX: Do intersection, we support only
- * the first regulatory hint for now */
- if (last_request->wiphy != wiphy)
- return -EALREADY;
- if (rd)
- return -EALREADY;
- /* Driver should not be trying to hint different
- * regulatory domains! */
- BUG_ON(!alpha2_equal(alpha2,
- cfg80211_regdomain->alpha2));
- return -EALREADY;
- }
- if (last_request->initiator == REGDOM_SET_BY_CORE)
- return 0;
- /* XXX: Handle intersection, and add the
- * dot11MultiDomainCapabilityEnabled flag to wiphy. For now
- * we assume the driver has this set to false, following the
- * 802.11d dot11MultiDomainCapabilityEnabled documentation */
- if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
- return 0;
- return 0;
- case REGDOM_SET_BY_USER:
- if (last_request->initiator == set_by ||
- last_request->initiator == REGDOM_SET_BY_CORE)
- return 0;
- /* Drivers can use their wiphy's reg_notifier()
- * to override any information */
- if (last_request->initiator == REGDOM_SET_BY_DRIVER)
- return 0;
- /* XXX: Handle intersection */
- if (last_request->initiator == REGDOM_SET_BY_COUNTRY_IE)
- return -EOPNOTSUPP;
- return 0;
- default:
- return -EINVAL;
- }
-}
-
-static bool __reg_is_valid_request(const char *alpha2,
- struct regulatory_request **request)
-{
- struct regulatory_request *req;
- if (list_empty(®ulatory_requests))
- return false;
- list_for_each_entry(req, ®ulatory_requests, list) {
- if (alpha2_equal(req->alpha2, alpha2)) {
- *request = req;
- return true;
- }
- }
- return false;
-}
-
/* Used by nl80211 before kmalloc'ing our regulatory domain */
bool reg_is_valid_request(const char *alpha2)
{
- struct regulatory_request *request = NULL;
- return __reg_is_valid_request(alpha2, &request);
+ if (!last_request)
+ return false;
+
+ return alpha2_equal(last_request->alpha2, alpha2);
}
/* Sanity check on a regulatory rule */
const struct ieee80211_freq_range *freq_range = &rule->freq_range;
u32 freq_diff;
- if (freq_range->start_freq_khz == 0 || freq_range->end_freq_khz == 0)
+ if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
return false;
if (freq_range->start_freq_khz > freq_range->end_freq_khz)
freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
- if (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;
if (!rd->n_reg_rules)
return false;
+ if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
+ return false;
+
for (i = 0; i < rd->n_reg_rules; i++) {
reg_rule = &rd->reg_rules[i];
if (!is_valid_reg_rule(reg_rule))
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
+ * 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) {
+ 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;
+
+ if (triplet->ext.reg_extension_id >=
+ IEEE80211_COUNTRY_EXTENSION_ID) {
+ country_ie += 3;
+ country_ie_len -= 3;
+ 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 = end_channel;
+
+ /* 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) {
+ int end_channel = 0;
+ 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 = ®_rule->freq_range;
+ power_rule = ®_rule->power_rule;
+
+ 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
+ * 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(
+ end_channel) + 10);
+
+ /* 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;
+}
+
+
+/* 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;
+}
+
/* 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)
* 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.
+ * 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.
*/
static int freq_reg_info(u32 center_freq, u32 *bandwidth,
const struct ieee80211_reg_rule **reg_rule)
{
int i;
+ bool band_rule_found = false;
u32 max_bandwidth = 0;
if (!cfg80211_regdomain)
rr = &cfg80211_regdomain->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;
}
-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),
&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;
}
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->fw_handles_regulatory)
+ return true;
+ return false;
}
static void update_all_wiphy_regulatory(enum reg_set_by setby)
struct cfg80211_registered_device *drv;
list_for_each_entry(drv, &cfg80211_drv_list, list)
- wiphy_update_regulatory(&drv->wiphy, setby);
+ if (!ignore_reg_update(&drv->wiphy, setby))
+ wiphy_update_regulatory(&drv->wiphy, setby);
}
void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
enum ieee80211_band band;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (wiphy->bands[band])
- handle_band(wiphy->bands[band]);
+ handle_band(wiphy, band);
if (wiphy->reg_notifier)
wiphy->reg_notifier(wiphy, setby);
}
}
-/* Caller must hold &cfg80211_drv_mutex */
-int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
- const char *alpha2, struct ieee80211_regdomain *rd)
-{
- struct regulatory_request *request;
- char *rd_alpha2;
- int r = 0;
-
- r = ignore_request(wiphy, set_by, (char *) alpha2, rd);
- if (r)
- return r;
+/* 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
- if (rd)
- rd_alpha2 = rd->alpha2;
- else
- rd_alpha2 = (char *) alpha2;
+/* 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;
+ }
+ /* 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)))
+ return 0;
+ return -EALREADY;
+ }
+ return REG_INTERSECT;
case REGDOM_SET_BY_DRIVER:
+ if (last_request->initiator == REGDOM_SET_BY_DRIVER)
+ return -EALREADY;
+ return 0;
case REGDOM_SET_BY_USER:
- request = kzalloc(sizeof(struct regulatory_request),
- GFP_KERNEL);
- if (!request)
- return -ENOMEM;
-
- request->alpha2[0] = rd_alpha2[0];
- request->alpha2[1] = rd_alpha2[1];
- request->initiator = set_by;
- request->wiphy = wiphy;
-
- list_add_tail(&request->list, ®ulatory_requests);
- if (rd)
- break;
- r = call_crda(alpha2);
-#ifndef CONFIG_WIRELESS_OLD_REGULATORY
- if (r)
- printk(KERN_ERR "cfg80211: Failed calling CRDA\n");
-#endif
- break;
- default:
- r = -ENOTSUPP;
- break;
+ if (last_request->initiator == 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 &&
+ last_request->intersect)
+ return -EOPNOTSUPP;
+ return 0;
}
- return r;
+ return -EINVAL;
}
-/* If rd is not NULL and if this call fails the caller must free it */
-int regulatory_hint(struct wiphy *wiphy, const char *alpha2,
- struct ieee80211_regdomain *rd)
+/* Caller must hold &cfg80211_drv_mutex */
+int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
+ const char *alpha2,
+ u32 country_ie_checksum,
+ enum environment_cap env)
{
- int r;
- BUG_ON(!rd && !alpha2);
+ struct regulatory_request *request;
+ bool intersect = false;
+ int r = 0;
- mutex_lock(&cfg80211_drv_mutex);
+ r = ignore_request(wiphy, set_by, alpha2);
+
+ if (r == REG_INTERSECT)
+ intersect = true;
+ else if (r)
+ return r;
- r = __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, rd);
- if (r || !rd)
- goto unlock_and_exit;
+ 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;
+ request->country_ie_checksum = country_ie_checksum;
+ request->country_ie_env = env;
+
+ kfree(last_request);
+ last_request = request;
+ /*
+ * 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);
+}
- /* If the driver passed a regulatory domain we skipped asking
- * userspace for one so we can now go ahead and set it */
- r = set_regdom(rd);
+void regulatory_hint(struct wiphy *wiphy, const char *alpha2)
+{
+ BUG_ON(!alpha2);
-unlock_and_exit:
+ mutex_lock(&cfg80211_drv_mutex);
+ __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY);
mutex_unlock(&cfg80211_drv_mutex);
- return r;
}
EXPORT_SYMBOL(regulatory_hint);
+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;
+
+ if (!last_request)
+ return;
+
+ 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);
static void print_rd_rules(const struct ieee80211_regdomain *rd)
{
static void print_regdomain(const struct ieee80211_regdomain *rd)
{
- if (is_world_regdom(rd->alpha2))
+ 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))
printk(KERN_INFO "cfg80211: World regulatory "
"domain updated:\n");
else {
print_rd_rules(rd);
}
-void print_regdomain_info(const struct ieee80211_regdomain *rd)
+static void print_regdomain_info(const struct ieee80211_regdomain *rd)
{
printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
rd->alpha2[0], rd->alpha2[1]);
print_rd_rules(rd);
}
-static int __set_regdom(const struct ieee80211_regdomain *rd)
+#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)
{
- struct regulatory_request *request = NULL;
+ 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");
+ print_regdomain_info(intersected_rd);
+ 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
+/* Takes ownership of rd only if it doesn't fail */
+static int __set_regdom(const struct ieee80211_regdomain *rd)
+{
+ const struct ieee80211_regdomain *intersected_rd = NULL;
+ struct cfg80211_registered_device *drv = NULL;
+ struct wiphy *wiphy = NULL;
/* Some basic sanity checks first */
if (is_world_regdom(rd->alpha2)) {
- if (WARN_ON(!__reg_is_valid_request(rd->alpha2, &request)))
+ if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
return -EINVAL;
update_world_regdomain(rd);
return 0;
!is_unknown_alpha2(rd->alpha2))
return -EINVAL;
- if (list_empty(®ulatory_requests))
+ if (!last_request)
return -EINVAL;
- /* allow overriding the static definitions if CRDA is present */
- if (!is_old_static_regdom(cfg80211_regdomain) &&
- !regdom_changed(rd->alpha2))
- return -EINVAL;
+ /* 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;
/* Now lets set the regulatory domain, update all driver channels
* and finally inform them of what we have done, in case they want
* to review or adjust their own settings based on their own
* internal EEPROM data */
- if (WARN_ON(!__reg_is_valid_request(rd->alpha2, &request)))
+ if (WARN_ON(!reg_is_valid_request(rd->alpha2)))
return -EINVAL;
- reset_regdomains();
+ if (!is_valid_rd(rd)) {
+ printk(KERN_ERR "cfg80211: Invalid "
+ "regulatory domain detected:\n");
+ print_regdomain_info(rd);
+ return -EINVAL;
+ }
- /* Country IE parsing coming soon */
- switch (request->initiator) {
- case REGDOM_SET_BY_CORE:
- case REGDOM_SET_BY_DRIVER:
- case REGDOM_SET_BY_USER:
- if (!is_valid_rd(rd)) {
- printk(KERN_ERR "cfg80211: Invalid "
- "regulatory domain detected:\n");
- print_regdomain_info(rd);
+ 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) {
+
+ intersected_rd = regdom_intersect(rd, cfg80211_regdomain);
+ if (!intersected_rd)
return -EINVAL;
- }
- break;
- case REGDOM_SET_BY_COUNTRY_IE: /* Not yet */
- WARN_ON(1);
- default:
- return -EOPNOTSUPP;
+
+ /* We can trash what CRDA provided now */
+ kfree(rd);
+ rd = NULL;
+
+ reset_regdomains();
+ cfg80211_regdomain = intersected_rd;
+
+ return 0;
}
- /* Tada! */
- cfg80211_regdomain = rd;
- request->granted = 1;
+ /*
+ * 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;
+
+ reset_regdomains();
+ cfg80211_regdomain = intersected_rd;
return 0;
}
/* Use this call to set the current regulatory domain. Conflicts with
* multiple drivers can be ironed out later. Caller must've already
- * kmalloc'd the rd structure. If this calls fails you should kfree()
- * the passed rd. Caller must hold cfg80211_drv_mutex */
+ * kmalloc'd the rd structure. Caller must hold cfg80211_drv_mutex */
int set_regdom(const struct ieee80211_regdomain *rd)
{
- struct regulatory_request *this_request = NULL, *prev_request = NULL;
int r;
- if (!list_empty(®ulatory_requests))
- prev_request = list_first_entry(®ulatory_requests,
- struct regulatory_request, list);
-
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
- if (r)
+ if (r) {
+ kfree(rd);
return r;
-
- BUG_ON((!__reg_is_valid_request(rd->alpha2, &this_request)));
-
- /* The initial standard core update of the world regulatory domain, no
- * need to keep that request info around if it didn't fail. */
- if (is_world_regdom(rd->alpha2) &&
- this_request->initiator == REGDOM_SET_BY_CORE &&
- this_request->granted) {
- list_del(&this_request->list);
- kfree(this_request);
- this_request = NULL;
- }
-
- /* Remove old requests, we only leave behind the last one */
- if (prev_request) {
- list_del(&prev_request->list);
- kfree(prev_request);
- prev_request = NULL;
}
/* This would make this whole thing pointless */
- BUG_ON(rd != cfg80211_regdomain);
+ if (!last_request->intersect)
+ BUG_ON(rd != cfg80211_regdomain);
/* update all wiphys now with the new established regulatory domain */
- update_all_wiphy_regulatory(this_request->initiator);
+ update_all_wiphy_regulatory(last_request->initiator);
- print_regdomain(rd);
+ print_regdomain(cfg80211_regdomain);
return r;
}
+/* Caller must hold cfg80211_drv_mutex */
+void reg_device_remove(struct wiphy *wiphy)
+{
+ if (!last_request || !last_request->wiphy)
+ return;
+ if (last_request->wiphy != wiphy)
+ return;
+ last_request->wiphy = NULL;
+ last_request->country_ie_env = ENVIRON_ANY;
+}
+
int regulatory_init(void)
{
int err;
* 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')
+ if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
- ieee80211_regdom, NULL);
+ ieee80211_regdom, 0, ENVIRON_ANY);
#else
cfg80211_regdomain = cfg80211_world_regdom;
- err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", NULL);
+ err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00", 0, ENVIRON_ANY);
if (err)
printk(KERN_ERR "cfg80211: calling CRDA failed - "
"unable to update world regulatory domain, "
void regulatory_exit(void)
{
- struct regulatory_request *req, *req_tmp;
-
mutex_lock(&cfg80211_drv_mutex);
reset_regdomains();
- list_for_each_entry_safe(req, req_tmp, ®ulatory_requests, list) {
- list_del(&req->list);
- kfree(req);
- }
+ kfree(country_ie_regdomain);
+ country_ie_regdomain = NULL;
+
+ kfree(last_request);
+
platform_device_unregister(reg_pdev);
mutex_unlock(&cfg80211_drv_mutex);
git.samba.org / sfrench / cifs-2.6.git / blobdiff