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To avoid following misinformed or outdated APs we build and use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, 11 insertions, 0 deletions

diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig
index f7c64dbe86cc..e28e2b8fa436 100644
--- a/net/wireless/Kconfig
+++ b/net/wireless/Kconfig
@@ -1,6 +1,15 @@
 config CFG80211
         tristate "Improved wireless configuration API"
 
+config CFG80211_REG_DEBUG
+        bool "cfg80211 regulatory debugging"
+        depends on CFG80211
+        default n
+        ---help---
+          You can enable this if you want to debug regulatory changes.
+
+          If unsure, say N.
+
 config NL80211
         bool "nl80211 new netlink interface support"
         depends on CFG80211
@@ -40,6 +49,8 @@ config WIRELESS_OLD_REGULATORY
           ieee80211_regdom module parameter. This is being phased out and you
           should stop using them ASAP.
 
+          Note: You will need CRDA if you want 802.11d support
+
           Say Y unless you have installed a new userspace application.
           Also say Y if have one currently depending on the ieee80211_regdom
           module parameter and cannot port it to use the new userspace