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Commit 170fd0b1 authored by Andrei Otcheretianski's avatar Andrei Otcheretianski Committed by Johannes Berg
Browse files

ieee80211: Support parsing TPC report element in action frames 



TPC report element is contained in spectrum management's tpc report
action frames and in radio measurement's link measurement report
action frames. Add a function which checks whether an action frame
contains this element. This may be needed by the drivers in order
to set the correct tx power value in these frames.

Signed-off-by: default avatarAndrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 970fdfa8

include/linux/ieee80211.h

+65 −0
Original line number Diff line number Diff line
@@ -838,6 +838,16 @@ enum ieee80211_vht_opmode_bits { 


#define WLAN_SA_QUERY_TR_ID_LEN 2



/**

 * struct ieee80211_tpc_report_ie

 *

 * This structure refers to "TPC Report element"

 */

struct ieee80211_tpc_report_ie {

	u8 tx_power;

	u8 link_margin;

} __packed;



struct ieee80211_mgmt {

	__le16 frame_control;

	__le16 duration;
@@ -973,6 +983,13 @@ struct ieee80211_mgmt { 
					u8 action_code;

					u8 operating_mode;

				} __packed vht_opmode_notif;

				struct {

					u8 action_code;

					u8 dialog_token;

					u8 tpc_elem_id;

					u8 tpc_elem_length;

					struct ieee80211_tpc_report_ie tpc;

				} __packed tpc_report;

			} u;

		} __packed action;

	} u;
@@ -1865,6 +1882,7 @@ enum ieee80211_category { 
	WLAN_CATEGORY_DLS = 2,

	WLAN_CATEGORY_BACK = 3,

	WLAN_CATEGORY_PUBLIC = 4,

	WLAN_CATEGORY_RADIO_MEASUREMENT = 5,

	WLAN_CATEGORY_HT = 7,

	WLAN_CATEGORY_SA_QUERY = 8,

	WLAN_CATEGORY_PROTECTED_DUAL_OF_ACTION = 9,
@@ -2378,4 +2396,51 @@ static inline bool ieee80211_check_tim(const struct ieee80211_tim_ie *tim, 
#define TU_TO_JIFFIES(x)	(usecs_to_jiffies((x) * 1024))

#define TU_TO_EXP_TIME(x)	(jiffies + TU_TO_JIFFIES(x))



/**

 * ieee80211_action_contains_tpc - checks if the frame contains TPC element

 * @skb: the skb containing the frame, length will be checked

 *

 * This function checks if it's either TPC report action frame or Link

 * Measurement report action frame as defined in IEEE Std. 802.11-2012 8.5.2.5

 * and 8.5.7.5 accordingly.

 */

static inline bool ieee80211_action_contains_tpc(struct sk_buff *skb)

{

	struct ieee80211_mgmt *mgmt = (void *)skb->data;



	if (!ieee80211_is_action(mgmt->frame_control))

		return false;



	if (skb->len < IEEE80211_MIN_ACTION_SIZE +

		       sizeof(mgmt->u.action.u.tpc_report))

		return false;



	/*

	 * TPC report - check that:

	 * category = 0 (Spectrum Management) or 5 (Radio Measurement)

	 * spectrum management action = 3 (TPC/Link Measurement report)

	 * TPC report EID = 35

	 * TPC report element length = 2

	 *

	 * The spectrum management's tpc_report struct is used here both for

	 * parsing tpc_report and radio measurement's link measurement report

	 * frame, since the relevant part is identical in both frames.

	 */

	if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT &&

	    mgmt->u.action.category != WLAN_CATEGORY_RADIO_MEASUREMENT)

		return false;



	/* both spectrum mgmt and link measurement have same action code */

	if (mgmt->u.action.u.tpc_report.action_code !=

	    WLAN_ACTION_SPCT_TPC_RPRT)

		return false;



	if (mgmt->u.action.u.tpc_report.tpc_elem_id != WLAN_EID_TPC_REPORT ||

	    mgmt->u.action.u.tpc_report.tpc_elem_length !=

	    sizeof(struct ieee80211_tpc_report_ie))

		return false;



	return true;

}



#endif /* LINUX_IEEE80211_H */