cfg80211: Add new wireless regulatory infrastructure

This adds the new wireless regulatory infrastructure. The
main motiviation behind this was to centralize regulatory
code as each driver was implementing their own regulatory solution,
and to replace the initial centralized code we have where:

* only 3 regulatory domains are supported: US, JP and EU
* regulatory domains can only be changed through module parameter
* all rules were built statically in the kernel

We now have support for regulatory domains for many countries
and regulatory domains are now queried through a userspace agent
through udev allowing distributions to update regulatory rules
without updating the kernel.

Each driver can regulatory_hint() a regulatory domain
based on either their EEPROM mapped regulatory domain value to a
respective ISO/IEC 3166-1 country code or pass an internally built
regulatory domain. We also add support to let the user set the
regulatory domain through userspace in case of faulty EEPROMs to
further help compliance.

Support for world roaming will be added soon for cards capable of
this.

For more information see:

http://wireless.kernel.org/en/developers/Regulatory/CRDA

For now we leave an option to enable the old module parameter,
ieee80211_regdom, and to build the 3 old regdomains statically
(US, JP and EU). This option is CONFIG_WIRELESS_OLD_REGULATORY.
These old static definitions and the module parameter is being
scheduled for removal for 2.6.29. Note that if you use this
you won't make use of a world regulatory domain as its pointless.
If you leave this option enabled and if CRDA is present and you
use US or JP we will try to ask CRDA to update us a regulatory
domain for us.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 94 insertions, 2 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 5e51f4e..9bad6540 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -92,6 +92,20 @@
  * @NL80211_CMD_SET_BSS: Set BSS attributes for BSS identified by
  *	%NL80211_ATTR_IFINDEX.
  *
+ * @NL80211_CMD_SET_REG: Set current regulatory domain. CRDA sends this command
+ *	after being queried by the kernel. CRDA replies by sending a regulatory
+ *	domain structure which consists of %NL80211_ATTR_REG_ALPHA set to our
+ *	current alpha2 if it found a match. It also provides
+ * 	NL80211_ATTR_REG_RULE_FLAGS, and a set of regulatory rules. Each
+ * 	regulatory rule is a nested set of attributes  given by
+ * 	%NL80211_ATTR_REG_RULE_FREQ_[START|END] and
+ * 	%NL80211_ATTR_FREQ_RANGE_MAX_BW with an attached power rule given by
+ * 	%NL80211_ATTR_REG_RULE_POWER_MAX_ANT_GAIN and
+ * 	%NL80211_ATTR_REG_RULE_POWER_MAX_EIRP.
+ * @NL80211_CMD_REQ_SET_REG: ask the wireless core to set the regulatory domain
+ * 	to the the specified ISO/IEC 3166-1 alpha2 country code. The core will
+ * 	store this as a valid request and then query userspace for it.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -131,7 +145,10 @@ enum nl80211_commands {
 
 	NL80211_CMD_SET_BSS,
 
-	/* add commands here */
+	NL80211_CMD_SET_REG,
+	NL80211_CMD_REQ_SET_REG,
+
+	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
 	__NL80211_CMD_AFTER_LAST,
@@ -197,10 +214,21 @@ enum nl80211_commands {
  * 	info given for %NL80211_CMD_GET_MPATH, nested attribute described at
  *	&enum nl80211_mpath_info.
  *
- *
  * @NL80211_ATTR_MNTR_FLAGS: flags, nested element with NLA_FLAG attributes of
  *      &enum nl80211_mntr_flags.
  *
+ * @NL80211_ATTR_REG_ALPHA2: an ISO-3166-alpha2 country code for which the
+ * 	current regulatory domain should be set to or is already set to.
+ * 	For example, 'CR', for Costa Rica. This attribute is used by the kernel
+ * 	to query the CRDA to retrieve one regulatory domain. This attribute can
+ * 	also be used by userspace to query the kernel for the currently set
+ * 	regulatory domain. We chose an alpha2 as that is also used by the
+ * 	IEEE-802.11d country information element to identify a country.
+ * 	Users can also simply ask the wireless core to set regulatory domain
+ * 	to a specific alpha2.
+ * @NL80211_ATTR_REG_RULES: a nested array of regulatory domain regulatory
+ *	rules.
+ *
  * @NL80211_ATTR_BSS_CTS_PROT: whether CTS protection is enabled (u8, 0 or 1)
  * @NL80211_ATTR_BSS_SHORT_PREAMBLE: whether short preamble is enabled
  *	(u8, 0 or 1)
@@ -265,6 +293,9 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_SUPPORTED_IFTYPES,
 
+	NL80211_ATTR_REG_ALPHA2,
+	NL80211_ATTR_REG_RULES,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -278,6 +309,7 @@ enum nl80211_attrs {
 #define NL80211_ATTR_HT_CAPABILITY NL80211_ATTR_HT_CAPABILITY
 
 #define NL80211_MAX_SUPP_RATES			32
+#define NL80211_MAX_SUPP_REG_RULES		32
 #define NL80211_TKIP_DATA_OFFSET_ENCR_KEY	0
 #define NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY	16
 #define NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY	24
@@ -473,6 +505,66 @@ enum nl80211_bitrate_attr {
 };
 
 /**
+ * enum nl80211_reg_rule_attr - regulatory rule attributes
+ * @NL80211_ATTR_REG_RULE_FLAGS: a set of flags which specify additional
+ * 	considerations for a given frequency range. These are the
+ * 	&enum nl80211_reg_rule_flags.
+ * @NL80211_ATTR_FREQ_RANGE_START: starting frequencry for the regulatory
+ * 	rule in KHz. This is not a center of frequency but an actual regulatory
+ * 	band edge.
+ * @NL80211_ATTR_FREQ_RANGE_END: ending frequency for the regulatory rule
+ * 	in KHz. This is not a center a frequency but an actual regulatory
+ * 	band edge.
+ * @NL80211_ATTR_FREQ_RANGE_MAX_BW: maximum allowed bandwidth for this
+ * 	frequency range, in KHz.
+ * @NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN: the maximum allowed antenna gain
+ * 	for a given frequency range. The value is in mBi (100 * dBi).
+ * 	If you don't have one then don't send this.
+ * @NL80211_ATTR_POWER_RULE_MAX_EIRP: the maximum allowed EIRP for
+ * 	a given frequency range. The value is in mBm (100 * dBm).
+ */
+enum nl80211_reg_rule_attr {
+	__NL80211_REG_RULE_ATTR_INVALID,
+	NL80211_ATTR_REG_RULE_FLAGS,
+
+	NL80211_ATTR_FREQ_RANGE_START,
+	NL80211_ATTR_FREQ_RANGE_END,
+	NL80211_ATTR_FREQ_RANGE_MAX_BW,
+
+	NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN,
+	NL80211_ATTR_POWER_RULE_MAX_EIRP,
+
+	/* keep last */
+	__NL80211_REG_RULE_ATTR_AFTER_LAST,
+	NL80211_REG_RULE_ATTR_MAX = __NL80211_REG_RULE_ATTR_AFTER_LAST - 1
+};
+
+/**
+ * enum nl80211_reg_rule_flags - regulatory rule flags
+ *
+ * @NL80211_RRF_NO_OFDM: OFDM modulation not allowed
+ * @NL80211_RRF_NO_CCK: CCK modulation not allowed
+ * @NL80211_RRF_NO_INDOOR: indoor operation not allowed
+ * @NL80211_RRF_NO_OUTDOOR: outdoor operation not allowed
+ * @NL80211_RRF_DFS: DFS support is required to be used
+ * @NL80211_RRF_PTP_ONLY: this is only for Point To Point links
+ * @NL80211_RRF_PTMP_ONLY: this is only for Point To Multi Point links
+ * @NL80211_RRF_PASSIVE_SCAN: passive scan is required
+ * @NL80211_RRF_NO_IBSS: no IBSS is allowed
+ */
+enum nl80211_reg_rule_flags {
+	NL80211_RRF_NO_OFDM		= 1<<0,
+	NL80211_RRF_NO_CCK		= 1<<1,
+	NL80211_RRF_NO_INDOOR		= 1<<2,
+	NL80211_RRF_NO_OUTDOOR		= 1<<3,
+	NL80211_RRF_DFS			= 1<<4,
+	NL80211_RRF_PTP_ONLY		= 1<<5,
+	NL80211_RRF_PTMP_ONLY		= 1<<6,
+	NL80211_RRF_PASSIVE_SCAN	= 1<<7,
+	NL80211_RRF_NO_IBSS		= 1<<8,
+};
+
+/**
  * enum nl80211_mntr_flags - monitor configuration flags
  *
  * Monitor configuration flags.