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wifi: ieee80211: add helper functions for detecting TM/FTM frames

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Add helper functions for detection timing measurement
and fine timing measurement frames.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Avraham Stern 2022-01-27 14:39:46 +02:00 committed by Johannes Berg
parent c204d9df02
commit 0903f89941
1 changed files with 54 additions and 0 deletions
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54
include/linux/ieee80211.h
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@ -1332,6 +1332,15 @@ struct ieee80211_mgmt {
u8 action_code;
u8 variable[];
} __packed s1g;
struct {
u8 action_code;
u8 dialog_token;
u8 follow_up;
u32 tod;
u32 toa;
u8 max_tod_error;
u8 max_toa_error;
} __packed wnm_timing_msr;
} u;
} __packed action;
} u;
@ -3522,6 +3531,17 @@ enum ieee80211_mesh_actioncode {
WLAN_MESH_ACTION_TBTT_ADJUSTMENT_RESPONSE,
};
/* Unprotected WNM action codes */
enum ieee80211_unprotected_wnm_actioncode {
WLAN_UNPROTECTED_WNM_ACTION_TIM = 0,
WLAN_UNPROTECTED_WNM_ACTION_TIMING_MEASUREMENT_RESPONSE = 1,
};
/* Public action codes */
enum ieee80211_public_actioncode {
WLAN_PUBLIC_ACTION_FTM_RESPONSE = 33,
};
/* Security key length */
enum ieee80211_key_len {
WLAN_KEY_LEN_WEP40 = 5,
@ -4311,6 +4331,40 @@ static inline bool ieee80211_action_contains_tpc(struct sk_buff *skb)
return true;
}
static inline bool ieee80211_is_timing_measurement(struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (skb->len < IEEE80211_MIN_ACTION_SIZE)
return false;
if (!ieee80211_is_action(mgmt->frame_control))
return false;
if (mgmt->u.action.category == WLAN_CATEGORY_WNM_UNPROTECTED &&
mgmt->u.action.u.wnm_timing_msr.action_code ==
WLAN_UNPROTECTED_WNM_ACTION_TIMING_MEASUREMENT_RESPONSE &&
skb->len >= offsetofend(typeof(*mgmt), u.action.u.wnm_timing_msr))
return true;
return false;
}
static inline bool ieee80211_is_ftm(struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
if (!ieee80211_is_public_action((void *)mgmt, skb->len))
return false;
if (mgmt->u.action.u.ftm.action_code ==
WLAN_PUBLIC_ACTION_FTM_RESPONSE &&
skb->len >= offsetofend(typeof(*mgmt), u.action.u.ftm))
return true;
return false;
}
struct element {
u8 id;
u8 datalen;