mac80211: handle TDLS high-level commands and frames

Register and implement the TDLS cfg80211 callback functions.

Internally prepare and send TDLS management frames. We incorporate
local STA capabilities and supported rates with extra IEs given by
usermode. The resulting packet is either encapsulated in a data frame,
or assembled as an action frame. It is transmitted either directly or
through the AP, as mandated by the TDLS specification.

Declare support for the TDLS external setup wiphy capability. This
tells usermode to handle link setup and discovery on its own, and use the
kernel driver for sending TDLS mgmt packets.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Cc: Kalyan C Gaddam <chakkal@iit.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/linux/ieee80211.h

@@ -759,6 +759,12 @@ struct ieee80211_mgmt {
 					u8 action;
 					u8 smps_control;
 				} __attribute__ ((packed)) ht_smps;
+				struct {
+					u8 action_code;
+					u8 dialog_token;
+					__le16 capability;
+					u8 variable[0];
+				} __packed tdls_discover_resp;
 			} u;
 		} __attribute__ ((packed)) action;
 	} u;
@@ -805,6 +811,52 @@ struct ieee80211_pspoll {
 	u8 ta[6];
 } __attribute__ ((packed));
 
+/* TDLS */
+
+/* Link-id information element */
+struct ieee80211_tdls_lnkie {
+	u8 ie_type; /* Link Identifier IE */
+	u8 ie_len;
+	u8 bssid[6];
+	u8 init_sta[6];
+	u8 resp_sta[6];
+} __packed;
+
+struct ieee80211_tdls_data {
+	u8 da[6];
+	u8 sa[6];
+	__be16 ether_type;
+	u8 payload_type;
+	u8 category;
+	u8 action_code;
+	union {
+		struct {
+			u8 dialog_token;
+			__le16 capability;
+			u8 variable[0];
+		} __packed setup_req;
+		struct {
+			__le16 status_code;
+			u8 dialog_token;
+			__le16 capability;
+			u8 variable[0];
+		} __packed setup_resp;
+		struct {
+			__le16 status_code;
+			u8 dialog_token;
+			u8 variable[0];
+		} __packed setup_cfm;
+		struct {
+			__le16 reason_code;
+			u8 variable[0];
+		} __packed teardown;
+		struct {
+			u8 dialog_token;
+			u8 variable[0];
+		} __packed discover_req;
+	} u;
+} __packed;
+
 /**
  * struct ieee80211_bar - HT Block Ack Request
  *
@@ -1196,6 +1248,8 @@ enum ieee80211_eid {
 	WLAN_EID_TS_DELAY = 43,
 	WLAN_EID_TCLAS_PROCESSING = 44,
 	WLAN_EID_QOS_CAPA = 46,
+	/* 802.11z */
+	WLAN_EID_LINK_ID = 101,
 	/* 802.11s */
 	WLAN_EID_MESH_CONFIG = 113,
 	WLAN_EID_MESH_ID = 114,
@@ -1279,6 +1333,7 @@ enum ieee80211_category {
 	WLAN_CATEGORY_HT = 7,
 	WLAN_CATEGORY_SA_QUERY = 8,
 	WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION = 9,
+	WLAN_CATEGORY_TDLS = 12,
 	WLAN_CATEGORY_MESH_ACTION = 13,
 	WLAN_CATEGORY_MULTIHOP_ACTION = 14,
 	WLAN_CATEGORY_SELF_PROTECTED = 15,
@@ -1342,6 +1397,36 @@ enum ieee80211_key_len {
 	WLAN_KEY_LEN_AES_CMAC = 16,
 };
 
+/* Public action codes */
+enum ieee80211_pub_actioncode {
+	WLAN_PUB_ACTION_TDLS_DISCOVER_RES = 14,
+};
+
+/* TDLS action codes */
+enum ieee80211_tdls_actioncode {
+	WLAN_TDLS_SETUP_REQUEST = 0,
+	WLAN_TDLS_SETUP_RESPONSE = 1,
+	WLAN_TDLS_SETUP_CONFIRM = 2,
+	WLAN_TDLS_TEARDOWN = 3,
+	WLAN_TDLS_PEER_TRAFFIC_INDICATION = 4,
+	WLAN_TDLS_CHANNEL_SWITCH_REQUEST = 5,
+	WLAN_TDLS_CHANNEL_SWITCH_RESPONSE = 6,
+	WLAN_TDLS_PEER_PSM_REQUEST = 7,
+	WLAN_TDLS_PEER_PSM_RESPONSE = 8,
+	WLAN_TDLS_PEER_TRAFFIC_RESPONSE = 9,
+	WLAN_TDLS_DISCOVERY_REQUEST = 10,
+};
+
+/*
+ * TDLS capabililites to be enabled in the 5th byte of the
+ * @WLAN_EID_EXT_CAPABILITY information element
+ */
+#define WLAN_EXT_CAPA5_TDLS_ENABLED	BIT(5)
+#define WLAN_EXT_CAPA5_TDLS_PROHIBITED	BIT(6)
+
+/* TDLS specific payload type in the LLC/SNAP header */
+#define WLAN_TDLS_SNAP_RFTYPE	0x2
+
 /**
  * enum - mesh path selection protocol identifier
  *

include/linux/if_ether.h

@@ -83,6 +83,7 @@
 #define ETH_P_8021AH	0x88E7          /* 802.1ah Backbone Service Tag */
 #define ETH_P_1588	0x88F7		/* IEEE 1588 Timesync */
 #define ETH_P_FCOE	0x8906		/* Fibre Channel over Ethernet  */
+#define ETH_P_TDLS	0x890D          /* TDLS */
 #define ETH_P_FIP	0x8914		/* FCoE Initialization Protocol */
 #define ETH_P_QINQ1	0x9100		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_QINQ2	0x9200		/* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */

net/mac80211/Kconfig

@@ -225,6 +225,18 @@ config MAC80211_VERBOSE_MHWMP_DEBUG
 
 	  Do not select this option.
 
+config MAC80211_VERBOSE_TDLS_DEBUG
+	bool "Verbose TDLS debugging"
+	depends on MAC80211_DEBUG_MENU
+	---help---
+	  Selecting this option causes mac80211 to print out very
+	  verbose TDLS selection debugging messages (when mac80211
+	  is a TDLS STA).
+	  It should not be selected on production systems as those
+	  messages are remotely triggerable.
+
+	  Do not select this option.
+
 config MAC80211_DEBUG_COUNTERS
 	bool "Extra statistics for TX/RX debugging"
 	depends on MAC80211_DEBUG_MENU