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>

1 files changed, 85 insertions, 0 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index b5e0a5c344fd..48363c3c40f8 100644
--- a/include/linux/ieee80211.h
+++ b/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
  *