Commit a5e70697 authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Johannes Berg
Browse files

mac80211: add radiotap flag and handling for 5/10 MHz 



Wireshark already defines radiotap channel flags for 5 and 10 MHz, so
just use them in Linux radiotap too. Furthermore, add rx status flags to
allow drivers to report when they received data on 5 or 10 MHz channels.

Signed-off-by: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarMathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
parent 438b61b7

include/net/ieee80211_radiotap.h

+4 −0
Original line number Diff line number Diff line
@@ -230,6 +230,10 @@ enum ieee80211_radiotap_type { 
#define	IEEE80211_CHAN_PASSIVE	0x0200	/* Only passive scan allowed */

#define	IEEE80211_CHAN_DYN	0x0400	/* Dynamic CCK-OFDM channel */

#define	IEEE80211_CHAN_GFSK	0x0800	/* GFSK channel (FHSS PHY) */

#define	IEEE80211_CHAN_GSM	0x1000	/* GSM (900 MHz) */

#define	IEEE80211_CHAN_STURBO	0x2000	/* Static Turbo */

#define	IEEE80211_CHAN_HALF	0x4000	/* Half channel (10 MHz wide) */

#define	IEEE80211_CHAN_QUARTER	0x8000	/* Quarter channel (5 MHz wide) */



/* For IEEE80211_RADIOTAP_FLAGS */

#define	IEEE80211_RADIOTAP_F_CFP	0x01	/* sent/received

include/net/mac80211.h

+4 −0
Original line number Diff line number Diff line
@@ -811,6 +811,8 @@ ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info) 
 * @RX_FLAG_AMPDU_DELIM_CRC_KNOWN: The delimiter CRC field is known (the CRC

 *	is stored in the @ampdu_delimiter_crc field)

 * @RX_FLAG_STBC_MASK: STBC 2 bit bitmask. 1 - Nss=1, 2 - Nss=2, 3 - Nss=3

 * @RX_FLAG_10MHZ: 10 MHz (half channel) was used

 * @RX_FLAG_5MHZ: 5 MHz (quarter channel) was used

 */

enum mac80211_rx_flags {

	RX_FLAG_MMIC_ERROR		= BIT(0),
@@ -839,6 +841,8 @@ enum mac80211_rx_flags { 
	RX_FLAG_80P80MHZ		= BIT(24),

	RX_FLAG_160MHZ			= BIT(25),

	RX_FLAG_STBC_MASK		= BIT(26) | BIT(27),

	RX_FLAG_10MHZ			= BIT(28),

	RX_FLAG_5MHZ			= BIT(29),

};



#define RX_FLAG_STBC_SHIFT		26

net/mac80211/rx.c

+12 −9
Original line number Diff line number Diff line
@@ -159,6 +159,7 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 
	__le32 *it_present;

	u32 it_present_val;

	u16 rx_flags = 0;

	u16 channel_flags = 0;

	int mpdulen, chain;

	unsigned long chains = status->chains;
@@ -243,20 +244,22 @@ ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, 
	/* IEEE80211_RADIOTAP_CHANNEL */

	put_unaligned_le16(status->freq, pos);

	pos += 2;

	if (status->flag & RX_FLAG_10MHZ)

		channel_flags |= IEEE80211_CHAN_HALF;

	else if (status->flag & RX_FLAG_5MHZ)

		channel_flags |= IEEE80211_CHAN_QUARTER;



	if (status->band == IEEE80211_BAND_5GHZ)

		put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,

				   pos);

		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;

	else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))

		put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ,

				   pos);

		channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;

	else if (rate && rate->flags & IEEE80211_RATE_ERP_G)

		put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,

				   pos);

		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;

	else if (rate)

		put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,

				   pos);

		channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;

	else

		put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos);

		channel_flags |= IEEE80211_CHAN_2GHZ;

	put_unaligned_le16(channel_flags, pos);

	pos += 2;



	/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */

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