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Commit d1332e7b authored by Shaul Triebitz's avatar Shaul Triebitz Committed by Johannes Berg
Browse files

mac80211: support radiotap L-SIG data 



As before with HE, the data needs to be provided by the
driver in the skb head, since there's not enough space
in the skb CB.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarShaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: default avatarLuca Coelho <luciano.coelho@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 70e53669

include/net/ieee80211_radiotap.h

+15 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ enum ieee80211_radiotap_presence { 
	IEEE80211_RADIOTAP_TIMESTAMP = 22,

	IEEE80211_RADIOTAP_HE = 23,

	IEEE80211_RADIOTAP_HE_MU = 24,

	IEEE80211_RADIOTAP_LSIG = 27,



	/* valid in every it_present bitmap, even vendor namespaces */

	IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
@@ -325,6 +326,20 @@ enum ieee80211_radiotap_he_mu_bits { 
	IEEE80211_RADIOTAP_HE_MU_FLAGS2_CH2_CTR_26T_RU		= 0x0800,

};



enum ieee80211_radiotap_lsig_data1 {

	IEEE80211_RADIOTAP_LSIG_DATA1_RATE_KNOWN		= 0x0001,

	IEEE80211_RADIOTAP_LSIG_DATA1_LENGTH_KNOWN		= 0x0002,

};



enum ieee80211_radiotap_lsig_data2 {

	IEEE80211_RADIOTAP_LSIG_DATA2_RATE			= 0x000f,

	IEEE80211_RADIOTAP_LSIG_DATA2_LENGTH			= 0xfff0,

};



struct ieee80211_radiotap_lsig {

	__le16 data1, data2;

};



/**

 * ieee80211_get_radiotap_len - get radiotap header length

 */

include/net/mac80211.h

+2 −0
Original line number Diff line number Diff line
@@ -1141,6 +1141,7 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info) 
 *	from the RX info data, so leave those zeroed when building this data)

 * @RX_FLAG_RADIOTAP_HE_MU: HE MU radiotap data is present

 *	(&struct ieee80211_radiotap_he_mu)

 * @RX_FLAG_RADIOTAP_LSIG: L-SIG radiotap data is present

 */

enum mac80211_rx_flags {

	RX_FLAG_MMIC_ERROR		= BIT(0),
@@ -1171,6 +1172,7 @@ enum mac80211_rx_flags { 
	RX_FLAG_AMPDU_EOF_BIT_KNOWN	= BIT(25),

	RX_FLAG_RADIOTAP_HE		= BIT(26),

	RX_FLAG_RADIOTAP_HE_MU		= BIT(27),

	RX_FLAG_RADIOTAP_LSIG		= BIT(28),

};



/**

net/mac80211/rx.c

+21 −0
Original line number Diff line number Diff line
@@ -189,6 +189,12 @@ ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, 
		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12);

	}



	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {

		len = ALIGN(len, 2);

		len += 4;

		BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4);

	}



	if (status->chains) {

		/* antenna and antenna signal fields */

		len += 2 * hweight8(status->chains);
@@ -279,6 +285,7 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 
	struct ieee80211_vendor_radiotap rtap = {};

	struct ieee80211_radiotap_he he = {};

	struct ieee80211_radiotap_he_mu he_mu = {};

	struct ieee80211_radiotap_lsig lsig = {};



	if (status->flag & RX_FLAG_RADIOTAP_HE) {

		he = *(struct ieee80211_radiotap_he *)skb->data;
@@ -291,6 +298,11 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 
		skb_pull(skb, sizeof(he_mu));

	}



	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {

		lsig = *(struct ieee80211_radiotap_lsig *)skb->data;

		skb_pull(skb, sizeof(lsig));

	}



	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {

		rtap = *(struct ieee80211_vendor_radiotap *)skb->data;

		/* rtap.len and rtap.pad are undone immediately */
@@ -630,6 +642,15 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 
		pos += sizeof(he_mu);

	}



	if (status->flag & RX_FLAG_RADIOTAP_LSIG) {

		/* ensure 2 byte alignment */

		while ((pos - (u8 *)rthdr) & 1)

			pos++;

		rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG);

		memcpy(pos, &lsig, sizeof(lsig));

		pos += sizeof(lsig);

	}



	for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {

		*pos++ = status->chain_signal[chain];

		*pos++ = chain;