nl80211: support sending TDLS commands/frames

Add support for sending high-level TDLS commands and TDLS frames via
NL80211_CMD_TDLS_OPER and NL80211_CMD_TDLS_MGMT, respectively. Add
appropriate cfg80211 callbacks for lower level drivers.

Add wiphy capability flags for TDLS support and advertise them via
nl80211.

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

2 files changed, 59 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index c73582f..a5ab23d 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -506,6 +506,9 @@
  * @NL80211_CMD_PMKSA_CANDIDATE: This is used as an event to inform userspace
  *	of PMKSA caching dandidates.
  *
+ * @NL80211_CMD_TDLS_OPER: Perform a high-level TDLS command (e.g. link setup).
+ * @NL80211_CMD_TDLS_MGMT: Send a TDLS management frame.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -632,6 +635,9 @@ enum nl80211_commands {
 
 	NL80211_CMD_PMKSA_CANDIDATE,
 
+	NL80211_CMD_TDLS_OPER,
+	NL80211_CMD_TDLS_MGMT,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
@@ -1089,6 +1095,20 @@ enum nl80211_commands {
  *	This attribute is used with %NL80211_CMD_TRIGGER_SCAN and
  *	%NL80211_CMD_FRAME commands.
  *
+ * @NL80211_ATTR_TDLS_ACTION: Low level TDLS action code (e.g. link setup
+ *	request, link setup confirm, link teardown, etc.). Values are
+ *	described in the TDLS (802.11z) specification.
+ * @NL80211_ATTR_TDLS_DIALOG_TOKEN: Non-zero token for uniquely identifying a
+ *	TDLS conversation between two devices.
+ * @NL80211_ATTR_TDLS_OPERATION: High level TDLS operation; see
+ *	&enum nl80211_tdls_operation, represented as a u8.
+ * @NL80211_ATTR_TDLS_SUPPORT: A flag indicating the device can operate
+ *	as a TDLS peer sta.
+ * @NL80211_ATTR_TDLS_EXTERNAL_SETUP: The TDLS discovery/setup and teardown
+ *	procedures should be performed by sending TDLS packets via
+ *	%NL80211_CMD_TDLS_MGMT. Otherwise %NL80211_CMD_TDLS_OPER should be
+ *	used for asking the driver to perform a TDLS operation.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1311,6 +1331,12 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_TX_NO_CCK_RATE,
 
+	NL80211_ATTR_TDLS_ACTION,
+	NL80211_ATTR_TDLS_DIALOG_TOKEN,
+	NL80211_ATTR_TDLS_OPERATION,
+	NL80211_ATTR_TDLS_SUPPORT,
+	NL80211_ATTR_TDLS_EXTERNAL_SETUP,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -2604,4 +2630,20 @@ enum nl80211_pmksa_candidate_attr {
 	MAX_NL80211_PMKSA_CANDIDATE = NUM_NL80211_PMKSA_CANDIDATE - 1
 };
 
+/**
+ * enum nl80211_tdls_operation - values for %NL80211_ATTR_TDLS_OPERATION
+ * @NL80211_TDLS_DISCOVERY_REQ: Send a TDLS discovery request
+ * @NL80211_TDLS_SETUP: Setup TDLS link
+ * @NL80211_TDLS_TEARDOWN: Teardown a TDLS link which is already established
+ * @NL80211_TDLS_ENABLE_LINK: Enable TDLS link
+ * @NL80211_TDLS_DISABLE_LINK: Disable TDLS link
+ */
+enum nl80211_tdls_operation {
+	NL80211_TDLS_DISCOVERY_REQ,
+	NL80211_TDLS_SETUP,
+	NL80211_TDLS_TEARDOWN,
+	NL80211_TDLS_ENABLE_LINK,
+	NL80211_TDLS_DISABLE_LINK,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 34b8f26..74f4f85 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1422,6 +1422,9 @@ struct cfg80211_gtk_rekey_data {
  * @set_ringparam: Set tx and rx ring sizes.
  *
  * @get_ringparam: Get tx and rx ring current and maximum sizes.
+ *
+ * @tdls_mgmt: Transmit a TDLS management frame.
+ * @tdls_oper: Perform a high-level TDLS operation (e.g. TDLS link setup).
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -1605,6 +1608,12 @@ struct cfg80211_ops {
 
 	int	(*set_rekey_data)(struct wiphy *wiphy, struct net_device *dev,
 				  struct cfg80211_gtk_rekey_data *data);
+
+	int	(*tdls_mgmt)(struct wiphy *wiphy, struct net_device *dev,
+			     u8 *peer, u8 action_code,  u8 dialog_token,
+			     u16 status_code, const u8 *buf, size_t len);
+	int	(*tdls_oper)(struct wiphy *wiphy, struct net_device *dev,
+			     u8 *peer, enum nl80211_tdls_operation oper);
 };
 
 /*
@@ -1657,6 +1666,12 @@ struct cfg80211_ops {
  * @WIPHY_FLAG_SUPPORTS_FW_ROAM: The device supports roaming feature in the
  *	firmware.
  * @WIPHY_FLAG_AP_UAPSD: The device supports uapsd on AP.
+ * @WIPHY_FLAG_SUPPORTS_TDLS: The device supports TDLS (802.11z) operation.
+ * @WIPHY_FLAG_TDLS_EXTERNAL_SETUP: The device does not handle TDLS (802.11z)
+ *	link setup/discovery operations internally. Setup, discovery and
+ *	teardown packets should be sent through the @NL80211_CMD_TDLS_MGMT
+ *	command. When this flag is not set, @NL80211_CMD_TDLS_OPER should be
+ *	used for asking the driver/firmware to perform a TDLS operation.
  */
 enum wiphy_flags {
 	WIPHY_FLAG_CUSTOM_REGULATORY		= BIT(0),
@@ -1673,6 +1688,8 @@ enum wiphy_flags {
 	WIPHY_FLAG_ENFORCE_COMBINATIONS		= BIT(12),
 	WIPHY_FLAG_SUPPORTS_FW_ROAM		= BIT(13),
 	WIPHY_FLAG_AP_UAPSD			= BIT(14),
+	WIPHY_FLAG_SUPPORTS_TDLS		= BIT(15),
+	WIPHY_FLAG_TDLS_EXTERNAL_SETUP		= BIT(16),
 };
 
 /**