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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: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Andrei Otcheretianski 2014-07-30 14:36:18 +03:00 committed by Johannes Berg
parent 970fdfa89b
commit 170fd0b1f6
1 changed files with 65 additions and 0 deletions
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65
include/linux/ieee80211.h
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@ -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 */