cfg80211/mac80211: Add 802.11d support

This adds country IE parsing to mac80211 and enables its usage
within the new regulatory infrastructure in cfg80211. We parse
the country IEs only on management beacons for the BSSID you are
associated to and disregard the IEs when the country and environment
(indoor, outdoor, any) matches the already processed country IE.

To avoid following misinformed or outdated APs we build and use
a regulatory domain out of the intersection between what the AP
provides us on the country IE and what CRDA is aware is allowed
on the same country.

A secondary device is allowed to follow only the same country IE
as it make no sense for two devices on a system to be in two
different countries.

In the case the AP is using country IEs for an incorrect country
the user may help compliance further by setting the regulatory
domain before or after the IE is parsed and in that case another
intersection will be performed.

CONFIG_WIRELESS_OLD_REGULATORY is supported but requires CRDA
present.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 17 insertions, 4 deletions

diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index c9b6b6358bbe..a76ea3ff7cd6 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -4,28 +4,41 @@
 bool is_world_regdom(const char *alpha2);
 bool reg_is_valid_request(const char *alpha2);
 
+void reg_device_remove(struct wiphy *wiphy);
+
 int regulatory_init(void);
 void regulatory_exit(void);
 
 int set_regdom(const struct ieee80211_regdomain *rd);
 
+enum environment_cap {
+        ENVIRON_ANY,
+        ENVIRON_INDOOR,
+        ENVIRON_OUTDOOR,
+};
+
+
 /**
  * __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_*
  *
  * 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 by giving it an
+ * ISO/IEC 3166 alpha2 country code it knows its regulatory domain should be
+ * in.
  *
  * Returns zero if all went fine, %-EALREADY if a regulatory domain had
  * already been set or other standard error codes.
  *
  */
 extern 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 country_ie_env);
 
 #endif  /* __NET_WIRELESS_REG_H */