nl80211: improve station flags handling

It is currently not possible to modify station flags, but that
capability would be very useful. This patch introduces a new
nl80211 attribute that contains a set/mask for station flags,
and updates the internal API (and mac80211) to mirror that.

The new attribute is parsed before falling back to the old so
that userspace can specify both (if it can) to work on all
kernels.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 25 insertions, 24 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 58c4ee1822d3..aeefccfac0e1 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -25,6 +25,8 @@
  *
  */
 
+#include <linux/types.h>
+
 /**
  * DOC: Station handling
  *
@@ -380,7 +382,7 @@ enum nl80211_commands {
  *
  * @NL80211_ATTR_STA_AID: Association ID for the station (u16)
  * @NL80211_ATTR_STA_FLAGS: flags, nested element with NLA_FLAG attributes of
- *	&enum nl80211_sta_flags.
+ *	&enum nl80211_sta_flags (deprecated, use %NL80211_ATTR_STA_FLAGS2)
  * @NL80211_ATTR_STA_LISTEN_INTERVAL: listen interval as defined by
  *	IEEE 802.11 7.3.1.6 (u16).
  * @NL80211_ATTR_STA_SUPPORTED_RATES: supported rates, array of supported
@@ -499,6 +501,9 @@ enum nl80211_commands {
  *	this attribute can be used
  *	with %NL80211_CMD_ASSOCIATE request
  *
+ * @NL80211_ATTR_STA_FLAGS2: Attribute containing a
+ *	&struct nl80211_sta_flag_update.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -603,6 +608,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_USE_MFP,
 
+	NL80211_ATTR_STA_FLAGS2,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -692,6 +699,18 @@ enum nl80211_sta_flags {
 };
 
 /**
+ * struct nl80211_sta_flag_update - station flags mask/set
+ * @mask: mask of station flags to set
+ * @set: which values to set them to
+ *
+ * Both mask and set contain bits as per &enum nl80211_sta_flags.
+ */
+struct nl80211_sta_flag_update {
+	__u32 mask;
+	__u32 set;
+} __attribute__((packed));
+
+/**
  * enum nl80211_rate_info - bitrate information
  *
  * These attribute types are used with %NL80211_STA_INFO_TXRATE
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index e69e6c66dd16..0dae6b382940 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -252,27 +252,6 @@ struct beacon_parameters {
 };
 
 /**
- * enum station_flags - station flags
- *
- * Station capability flags. Note that these must be the bits
- * according to the nl80211 flags.
- *
- * @STATION_FLAG_CHANGED: station flags were changed
- * @STATION_FLAG_AUTHORIZED: station is authorized to send frames (802.1X)
- * @STATION_FLAG_SHORT_PREAMBLE: station is capable of receiving frames
- *	with short preambles
- * @STATION_FLAG_WME: station is WME/QoS capable
- * @STATION_FLAG_MFP: station uses management frame protection
- */
-enum station_flags {
-	STATION_FLAG_CHANGED		= 1<<0,
-	STATION_FLAG_AUTHORIZED		= 1<<NL80211_STA_FLAG_AUTHORIZED,
-	STATION_FLAG_SHORT_PREAMBLE	= 1<<NL80211_STA_FLAG_SHORT_PREAMBLE,
-	STATION_FLAG_WME		= 1<<NL80211_STA_FLAG_WME,
-	STATION_FLAG_MFP		= 1<<NL80211_STA_FLAG_MFP,
-};
-
-/**
  * enum plink_action - actions to perform in mesh peers
  *
  * @PLINK_ACTION_INVALID: action 0 is reserved
@@ -294,14 +273,17 @@ enum plink_actions {
  * @supported_rates: supported rates in IEEE 802.11 format
  *	(or NULL for no change)
  * @supported_rates_len: number of supported rates
- * @station_flags: station flags (see &enum station_flags)
+ * @sta_flags_mask: station flags that changed
+ *	(bitmask of BIT(NL80211_STA_FLAG_...))
+ * @sta_flags_set: station flags values
+ *	(bitmask of BIT(NL80211_STA_FLAG_...))
  * @listen_interval: listen interval or -1 for no change
  * @aid: AID or zero for no change
  */
 struct station_parameters {
 	u8 *supported_rates;
 	struct net_device *vlan;
-	u32 station_flags;
+	u32 sta_flags_mask, sta_flags_set;
 	int listen_interval;
 	u16 aid;
 	u8 supported_rates_len;