cfg80211/mac80211: allow per-station GTKs

This adds API to allow adding per-station GTKs,
updates mac80211 to support it, and also allows
drivers to remove a key from hwaccel again when
this may be necessary due to multiple GTKs.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 42 insertions, 3 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index c4efdfa..e451f17 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -801,6 +801,9 @@ enum nl80211_commands {
  *      This is used in association with @NL80211_ATTR_WIPHY_TX_POWER_SETTING
  *      for non-automatic settings.
  *
+ * @NL80211_ATTR_SUPPORT_IBSS_RSN: The device supports IBSS RSN, which mostly
+ *	means support for per-station GTKs.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -968,6 +971,8 @@ enum nl80211_attrs {
 	NL80211_ATTR_CONTROL_PORT_ETHERTYPE,
 	NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT,
 
+	NL80211_ATTR_SUPPORT_IBSS_RSN,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -1659,11 +1664,14 @@ enum nl80211_auth_type {
  * @NL80211_KEYTYPE_GROUP: Group (broadcast/multicast) key
  * @NL80211_KEYTYPE_PAIRWISE: Pairwise (unicast/individual) key
  * @NL80211_KEYTYPE_PEERKEY: PeerKey (DLS)
+ * @NUM_NL80211_KEYTYPES: number of defined key types
  */
 enum nl80211_key_type {
 	NL80211_KEYTYPE_GROUP,
 	NL80211_KEYTYPE_PAIRWISE,
 	NL80211_KEYTYPE_PEERKEY,
+
+	NUM_NL80211_KEYTYPES
 };
 
 /**
@@ -1694,6 +1702,9 @@ enum nl80211_wpa_versions {
  *	CCMP keys, each six bytes in little endian
  * @NL80211_KEY_DEFAULT: flag indicating default key
  * @NL80211_KEY_DEFAULT_MGMT: flag indicating default management key
+ * @NL80211_KEY_TYPE: the key type from enum nl80211_key_type, if not
+ *	specified the default depends on whether a MAC address was
+ *	given with the command using the key or not (u32)
  * @__NL80211_KEY_AFTER_LAST: internal
  * @NL80211_KEY_MAX: highest key attribute
  */
@@ -1705,6 +1716,7 @@ enum nl80211_key_attributes {
 	NL80211_KEY_SEQ,
 	NL80211_KEY_DEFAULT,
 	NL80211_KEY_DEFAULT_MGMT,
+	NL80211_KEY_TYPE,
 
 	/* keep last */
 	__NL80211_KEY_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5f4d8ac..0f77515 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1130,13 +1130,14 @@ struct cfg80211_ops {
 				       struct vif_params *params);
 
 	int	(*add_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, const u8 *mac_addr,
+			   u8 key_index, bool pairwise, const u8 *mac_addr,
 			   struct key_params *params);
 	int	(*get_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, const u8 *mac_addr, void *cookie,
+			   u8 key_index, bool pairwise, const u8 *mac_addr,
+			   void *cookie,
 			   void (*callback)(void *cookie, struct key_params*));
 	int	(*del_key)(struct wiphy *wiphy, struct net_device *netdev,
-			   u8 key_index, const u8 *mac_addr);
+			   u8 key_index, bool pairwise, const u8 *mac_addr);
 	int	(*set_default_key)(struct wiphy *wiphy,
 				   struct net_device *netdev,
 				   u8 key_index);
@@ -1304,6 +1305,7 @@ struct cfg80211_ops {
  * @WIPHY_FLAG_CONTROL_PORT_PROTOCOL: This device supports setting the
  *	control port protocol ethertype. The device also honours the
  *	control_port_no_encrypt flag.
+ * @WIPHY_FLAG_IBSS_RSN: The device supports IBSS RSN.
  */
 enum wiphy_flags {
 	WIPHY_FLAG_CUSTOM_REGULATORY		= BIT(0),
@@ -1314,6 +1316,7 @@ enum wiphy_flags {
 	WIPHY_FLAG_4ADDR_AP			= BIT(5),
 	WIPHY_FLAG_4ADDR_STATION		= BIT(6),
 	WIPHY_FLAG_CONTROL_PORT_PROTOCOL	= BIT(7),
+	WIPHY_FLAG_IBSS_RSN			= BIT(7),
 };
 
 struct mac_address {
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 47316a6..33aa2e3 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1041,6 +1041,13 @@ enum ieee80211_tkip_key_type {
  * @IEEE80211_HW_NEED_DTIM_PERIOD:
  *	This device needs to know the DTIM period for the BSS before
  *	associating.
+ *
+ * @IEEE80211_HW_SUPPORTS_PER_STA_GTK: The device's crypto engine supports
+ *	per-station GTKs as used by IBSS RSN or during fast transition. If
+ *	the device doesn't support per-station GTKs, but can be asked not
+ *	to decrypt group addressed frames, then IBSS RSN support is still
+ *	possible but software crypto will be used. Advertise the wiphy flag
+ *	only in that case.
  */
 enum ieee80211_hw_flags {
 	IEEE80211_HW_HAS_RATE_CONTROL			= 1<<0,
@@ -1064,6 +1071,7 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_REPORTS_TX_ACK_STATUS		= 1<<18,
 	IEEE80211_HW_CONNECTION_MONITOR			= 1<<19,
 	IEEE80211_HW_SUPPORTS_CQM_RSSI			= 1<<20,
+	IEEE80211_HW_SUPPORTS_PER_STA_GTK		= 1<<21,
 };
 
 /**
@@ -2582,6 +2590,22 @@ void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success);
 void ieee80211_request_smps(struct ieee80211_vif *vif,
 			    enum ieee80211_smps_mode smps_mode);
 
+/**
+ * ieee80211_key_removed - disable hw acceleration for key
+ * @key_conf: The key hw acceleration should be disabled for
+ *
+ * This allows drivers to indicate that the given key has been
+ * removed from hardware acceleration, due to a new key that
+ * was added. Don't use this if the key can continue to be used
+ * for TX, if the key restriction is on RX only it is permitted
+ * to keep the key for TX only and not call this function.
+ *
+ * Due to locking constraints, it may only be called during
+ * @set_key. This function must be allowed to sleep, and the
+ * key it tries to disable may still be used until it returns.
+ */
+void ieee80211_key_removed(struct ieee80211_key_conf *key_conf);
+
 /* Rate control API */
 
 /**