* @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 */
* 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,
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 0;
}
+/* 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) {
+ 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;
+ }
+
+ cur_channel = triplet->chans.first_channel;
+ cur_sub_max_channel = ieee80211_channel_to_frequency(
+ cur_channel + triplet->chans.num_channels);
+
+ /* 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) {
+ 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;
+
+ /* 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(
+ triplet->chans.first_channel +
+ triplet->chans.num_channels) + 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(
return -EOPNOTSUPP;
return -EALREADY;
}
- /* Two consecutive Country IE hints on the same wiphy */
- if (!alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
+ /* 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;
}
- /*
- * Ignore Country IE hints for now, need to think about
- * what we need to do to support multi-domain operation.
- */
- return -EOPNOTSUPP;
+ return REG_INTERSECT;
case REGDOM_SET_BY_DRIVER:
if (last_request->initiator == REGDOM_SET_BY_DRIVER)
return -EALREADY;
case REGDOM_SET_BY_USER:
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;
}
/* Caller must hold &cfg80211_drv_mutex */
int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
- const char *alpha2)
+ const char *alpha2,
+ u32 country_ie_checksum,
+ enum environment_cap env)
{
struct regulatory_request *request;
bool intersect = false;
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);
}
BUG_ON(!alpha2);
mutex_lock(&cfg80211_drv_mutex);
- __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2);
+ __regulatory_hint(wiphy, REGDOM_SET_BY_DRIVER, alpha2, 0, ENVIRON_ANY);
mutex_unlock(&cfg80211_drv_mutex);
}
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;
+
+ 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);
}
+#ifdef CONFIG_CFG80211_REG_DEBUG
+static void reg_country_ie_process_debug(
+ const struct ieee80211_regdomain *rd,
+ const struct ieee80211_regdomain *country_ie_regdomain,
+ const struct ieee80211_regdomain *intersected_rd)
+{
+ printk(KERN_DEBUG "cfg80211: Received country IE:\n");
+ print_regdomain_info(country_ie_regdomain);
+ printk(KERN_DEBUG "cfg80211: CRDA thinks this should applied:\n");
+ print_regdomain_info(rd);
+ if (intersected_rd) {
+ printk(KERN_DEBUG "cfg80211: We intersect both of these "
+ "and get:\n");
+ print_regdomain_info(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 (!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
return 0;
}
- /* Country IE parsing coming soon */
+ /*
+ * 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();
- WARN_ON(1);
+ cfg80211_regdomain = intersected_rd;
return 0;
}
return r;
}
+/* Caller must hold cfg80211_drv_mutex */
+void reg_device_remove(struct wiphy *wiphy)
+{
+ if (!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;
* that is not a valid ISO / IEC 3166 alpha2 */
if (ieee80211_regdom[0] != 'E' || ieee80211_regdom[1] != 'U')
err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE,
- ieee80211_regdom);
+ ieee80211_regdom, 0, ENVIRON_ANY);
#else
cfg80211_regdomain = cfg80211_world_regdom;
- err = __regulatory_hint(NULL, REGDOM_SET_BY_CORE, "00");
+ 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, "
reset_regdomains();
+ kfree(country_ie_regdomain);
+ country_ie_regdomain = NULL;
+
kfree(last_request);
platform_device_unregister(reg_pdev);
projects / openwrt / staging / blogic.git / commitdiff