path: root/sys/net80211/ieee80211.h

/*	$OpenBSD: ieee80211.h,v 1.27 2007/07/03 15:22:15 claudio Exp $	*/
/*	$NetBSD: ieee80211.h,v 1.6 2004/04/30 23:51:53 dyoung Exp $	*/

/*-
 * Copyright (c) 2001 Atsushi Onoe
 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/net80211/ieee80211.h,v 1.5 2004/04/05 17:47:40 sam Exp $
 */
#ifndef _NET80211_IEEE80211_H_
#define _NET80211_IEEE80211_H_

/*
 * 802.11 protocol definitions.
 */

#define	IEEE80211_ADDR_LEN	6		/* size of 802.11 address */
/* is 802.11 address multicast/broadcast? */
#define	IEEE80211_IS_MULTICAST(_a)	(*(_a) & 0x01)

/* IEEE 802.11 PLCP header */
struct ieee80211_plcp_hdr {
	u_int16_t	i_sfd;
	u_int8_t	i_signal;
	u_int8_t	i_service;
	u_int16_t	i_length;
	u_int16_t	i_crc;
} __packed;

#define IEEE80211_PLCP_SFD      0xF3A0
#define IEEE80211_PLCP_SERVICE  0x00
#define IEEE80211_PLCP_SERVICE_PBCC  0x08	/* PBCC encoded */
#define IEEE80211_PLCP_SERVICE_LENEXT  0x80	/* length extension bit */

/*
 * generic definitions for IEEE 802.11 frames
 */
struct ieee80211_frame {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_addr1[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr2[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr3[IEEE80211_ADDR_LEN];
	u_int8_t	i_seq[2];
	/* possibly followed by addr4[IEEE80211_ADDR_LEN]; */
	/* see below */
} __packed;

struct ieee80211_qosframe {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_addr1[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr2[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr3[IEEE80211_ADDR_LEN];
	u_int8_t	i_seq[2];
	u_int8_t	i_qos[2];
	/* possibly followed by addr4[IEEE80211_ADDR_LEN]; */
	/* see below */
} __packed;

struct ieee80211_frame_addr4 {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_addr1[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr2[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr3[IEEE80211_ADDR_LEN];
	u_int8_t	i_seq[2];
	u_int8_t	i_addr4[IEEE80211_ADDR_LEN];
} __packed;


struct ieee80211_qosframe_addr4 {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_addr1[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr2[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr3[IEEE80211_ADDR_LEN];
	u_int8_t	i_seq[2];
	u_int8_t	i_addr4[IEEE80211_ADDR_LEN];
	u_int8_t	i_qos[2];
} __packed;

/*
 * Management Notification Frame
 */
struct ieee80211_mnf {
	u_int8_t	mnf_category;
	u_int8_t	mnf_action;
	u_int8_t	mnf_dialog;
	u_int8_t	mnf_status;
} __packed;
#define	MNF_SETUP_REQ	0
#define	MNF_SETUP_RESP	1
#define	MNF_TEARDOWN	2


#define	IEEE80211_FC0_VERSION_MASK		0x03
#define	IEEE80211_FC0_VERSION_SHIFT		0
#define	IEEE80211_FC0_VERSION_0			0x00
#define	IEEE80211_FC0_TYPE_MASK			0x0c
#define	IEEE80211_FC0_TYPE_SHIFT		2
#define	IEEE80211_FC0_TYPE_MGT			0x00
#define	IEEE80211_FC0_TYPE_CTL			0x04
#define	IEEE80211_FC0_TYPE_DATA			0x08

#define	IEEE80211_FC0_SUBTYPE_MASK		0xf0
#define	IEEE80211_FC0_SUBTYPE_SHIFT		4
/* for TYPE_MGT */
#define	IEEE80211_FC0_SUBTYPE_ASSOC_REQ		0x00
#define	IEEE80211_FC0_SUBTYPE_ASSOC_RESP	0x10
#define	IEEE80211_FC0_SUBTYPE_REASSOC_REQ	0x20
#define	IEEE80211_FC0_SUBTYPE_REASSOC_RESP	0x30
#define	IEEE80211_FC0_SUBTYPE_PROBE_REQ		0x40
#define	IEEE80211_FC0_SUBTYPE_PROBE_RESP	0x50
#define	IEEE80211_FC0_SUBTYPE_BEACON		0x80
#define	IEEE80211_FC0_SUBTYPE_ATIM		0x90
#define	IEEE80211_FC0_SUBTYPE_DISASSOC		0xa0
#define	IEEE80211_FC0_SUBTYPE_AUTH		0xb0
#define	IEEE80211_FC0_SUBTYPE_DEAUTH		0xc0
/* for TYPE_CTL */
#define	IEEE80211_FC0_SUBTYPE_PS_POLL		0xa0
#define	IEEE80211_FC0_SUBTYPE_RTS		0xb0
#define	IEEE80211_FC0_SUBTYPE_CTS		0xc0
#define	IEEE80211_FC0_SUBTYPE_ACK		0xd0
#define	IEEE80211_FC0_SUBTYPE_CF_END		0xe0
#define	IEEE80211_FC0_SUBTYPE_CF_END_ACK	0xf0
/* for TYPE_DATA (bit combination) */
#define	IEEE80211_FC0_SUBTYPE_DATA		0x00
#define	IEEE80211_FC0_SUBTYPE_CF_ACK		0x10
#define	IEEE80211_FC0_SUBTYPE_CF_POLL		0x20
#define	IEEE80211_FC0_SUBTYPE_CF_ACPL		0x30
#define	IEEE80211_FC0_SUBTYPE_NODATA		0x40
#define	IEEE80211_FC0_SUBTYPE_CFACK		0x50
#define	IEEE80211_FC0_SUBTYPE_CFPOLL		0x60
#define	IEEE80211_FC0_SUBTYPE_CF_ACK_CF_ACK	0x70
#define	IEEE80211_FC0_SUBTYPE_QOS		0x80

#define	IEEE80211_FC1_DIR_MASK			0x03
#define	IEEE80211_FC1_DIR_NODS			0x00	/* STA->STA */
#define	IEEE80211_FC1_DIR_TODS			0x01	/* STA->AP  */
#define	IEEE80211_FC1_DIR_FROMDS		0x02	/* AP ->STA */
#define	IEEE80211_FC1_DIR_DSTODS		0x03	/* AP ->AP  */

#define	IEEE80211_FC1_MORE_FRAG			0x04
#define	IEEE80211_FC1_RETRY			0x08
#define	IEEE80211_FC1_PWR_MGT			0x10
#define	IEEE80211_FC1_MORE_DATA			0x20
#define	IEEE80211_FC1_PROTECTED			0x40
#define	IEEE80211_FC1_WEP			0x40	/* pre-RSNA compat */
#define	IEEE80211_FC1_ORDER			0x80

#define	IEEE80211_SEQ_FRAG_MASK			0x000f
#define	IEEE80211_SEQ_FRAG_SHIFT		0
#define	IEEE80211_SEQ_SEQ_MASK			0xfff0
#define	IEEE80211_SEQ_SEQ_SHIFT			4

#define	IEEE80211_NWID_LEN			32

#define	IEEE80211_QOS_TXOP			0x00ff
/* bit 8 is reserved */
#define	IEEE80211_QOS_ACKPOLICY			0x0600
#define	IEEE80211_QOS_ESOP			0x0800
#define	IEEE80211_QOS_TID			0xf000

/*
 * Control frames.
 */
struct ieee80211_frame_min {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_addr1[IEEE80211_ADDR_LEN];
	u_int8_t	i_addr2[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

struct ieee80211_frame_rts {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_ra[IEEE80211_ADDR_LEN];
	u_int8_t	i_ta[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

struct ieee80211_frame_cts {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_ra[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

struct ieee80211_frame_ack {
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];
	u_int8_t	i_ra[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

struct ieee80211_frame_pspoll {
	u_int8_t	i_fc[2];
	u_int8_t	i_aid[2];
	u_int8_t	i_bssid[IEEE80211_ADDR_LEN];
	u_int8_t	i_ta[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

struct ieee80211_frame_cfend {		/* NB: also CF-End+CF-Ack */
	u_int8_t	i_fc[2];
	u_int8_t	i_dur[2];	/* should be zero */
	u_int8_t	i_ra[IEEE80211_ADDR_LEN];
	u_int8_t	i_bssid[IEEE80211_ADDR_LEN];
	/* FCS */
} __packed;

#define	IEEE80211_CAPINFO_ESS			0x0001
#define	IEEE80211_CAPINFO_IBSS			0x0002
#define	IEEE80211_CAPINFO_CF_POLLABLE		0x0004
#define	IEEE80211_CAPINFO_CF_POLLREQ		0x0008
#define	IEEE80211_CAPINFO_PRIVACY		0x0010
#define	IEEE80211_CAPINFO_SHORT_PREAMBLE	0x0020
#define	IEEE80211_CAPINFO_PBCC			0x0040
#define	IEEE80211_CAPINFO_CHNL_AGILITY		0x0080
#define IEEE80211_CAPINFO_SPECTRUM_MGMT		0x0100
#define IEEE80211_CAPINFO_QOS			0x0200
#define	IEEE80211_CAPINFO_SHORT_SLOTTIME	0x0400
#define	IEEE80211_CAPINFO_APSD			0x0800
/* bit 12 is reserved */
#define	IEEE80211_CAPINFO_DSSSOFDM		0x2000
#define IEEE80211_CAPINFO_DELAYED_B_ACK		0x4000
#define IEEE80211_CAPINFO_IMMEDIATE_B_ACK	0x8000
#define IEEE80211_CAPINFO_BITS					\
	"\10\01ESS\02IBSS\03CF_POLLABLE\04CF_POLLREQ"		\
	"\05PRIVACY\06SHORT_PREAMBLE\07PBCC\10CHNL_AGILITY"	\
	"\11SPECTRUM_MGMT\12QOS\13SHORT_SLOTTIME\14APSD"	\
	"\16DSSSOFDM\17DELAYED_B_ACK\20IMMEDIATE_B_ACK"

/* 
 * Channel attributes
 */
#define	IEEE80211_CHAN_TURBO	0x0010	/* Turbo channel */
#define	IEEE80211_CHAN_CCK	0x0020	/* CCK channel */
#define	IEEE80211_CHAN_OFDM	0x0040	/* OFDM channel */
#define	IEEE80211_CHAN_2GHZ	0x0080	/* 2 GHz spectrum channel. */
#define	IEEE80211_CHAN_5GHZ	0x0100	/* 5 GHz spectrum channel */
#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_XR	0x1000	/* Extended range OFDM channel */

/*
 * Useful combinations of channel characteristics.
 */
#define	IEEE80211_CHAN_FHSS \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_GFSK)
#define	IEEE80211_CHAN_A \
	(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM)
#define	IEEE80211_CHAN_B \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK)
#define	IEEE80211_CHAN_PUREG \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_OFDM)
#define	IEEE80211_CHAN_G \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN)
#define	IEEE80211_CHAN_T \
	(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO)
#define	IEEE80211_CHAN_TG \
	(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO)

/*
 * Management information element payloads
 */
union ieee80211_information {
	char	ssid[IEEE80211_NWID_LEN+1];
	struct rates {
		u_int8_t	*p;
	} rates;
	struct fh {
		u_int16_t	dwell;
		u_int8_t	set;
		u_int8_t	pattern;
		u_int8_t	index;
	} fh;
	struct ds {
		u_int8_t	channel;
	} ds;
	struct cf {
		u_int8_t	count;
		u_int8_t	period;
		u_int8_t	maxdur[2];
		u_int8_t	dur[2];
	} cf;
	struct tim {
		u_int8_t	count;
		u_int8_t	period;
		u_int8_t	bitctl;
		/* u_int8_t	pvt[251]; The driver needs to use this. */
	} tim;
	struct ibss {
		u_int16_t	atim;
	} ibss;
	struct challenge {
		u_int8_t	*p;
		u_int8_t	len;
	} challenge;
	struct erp {
		u_int8_t	flags;
	} erp;
	struct country {
		u_int8_t	cc[3];		/* ISO CC+(I)ndoor/(O)utdoor */
		struct {
			u_int8_t schan;		/* starting channel */
			u_int8_t nchan;		/* number channels */
			u_int8_t maxtxpwr;
		} band[4];			/* up to 4 sub bands */
	} country;
	struct ath {
		u_int8_t	flags;
	} ath;
};

enum {
	IEEE80211_ELEMID_SSID			= 0,
	IEEE80211_ELEMID_RATES			= 1,
	IEEE80211_ELEMID_FHPARMS		= 2,
	IEEE80211_ELEMID_DSPARMS		= 3,
	IEEE80211_ELEMID_CFPARMS		= 4,
	IEEE80211_ELEMID_TIM			= 5,
	IEEE80211_ELEMID_IBSSPARMS		= 6,
	IEEE80211_ELEMID_COUNTRY		= 7,
	IEEE80211_ELEMID_QBSS_LOAD		= 11,
	IEEE80211_ELEMID_EDCAPARMS		= 12,
	IEEE80211_ELEMID_CHALLENGE		= 16,
	/* 17-31 reserved for challenge text extension */
	IEEE80211_ELEMID_ERP			= 42,
	IEEE80211_ELEMID_QOS_CAP		= 46,
	IEEE80211_ELEMID_RSN			= 48,
	IEEE80211_ELEMID_XRATES			= 50,
	IEEE80211_ELEMID_TPC			= 150,
	IEEE80211_ELEMID_CCKM			= 156,
	IEEE80211_ELEMID_VENDOR			= 221	/* vendor private */
};

#define IEEE80211_CHALLENGE_LEN			128

#define	IEEE80211_RATE_BASIC			0x80
#define	IEEE80211_RATE_VAL			0x7f
#define	IEEE80211_RATE_SIZE			8	/* 802.11 standard */
#define	IEEE80211_RATE_MAXSIZE			15	/* max rates we'll handle */

/* ERP information element flags */
#define	IEEE80211_ERP_NON_ERP_PRESENT		0x01
#define	IEEE80211_ERP_USE_PROTECTION		0x02
#define	IEEE80211_ERP_BARKER_MODE		0x04

/*
 * 802.11e EDCA Access Categories.
 */
enum ieee80211_edca_ac {
	EDCA_AC_BK  = 1,	/* Background */
	EDCA_AC_BE  = 0,	/* Best Effort */
	EDCA_AC_VI  = 2,	/* Video */
	EDCA_AC_VO  = 3		/* Voice */
};
#define EDCA_NUM_AC	4

/* number of TID values (traffic identifier) */
#define IEEE80211_NUM_TID	16

/* Atheros private advanced capabilities info */
#define	ATHEROS_CAP_TURBO_PRIME			0x01
#define	ATHEROS_CAP_COMPRESSION			0x02
#define	ATHEROS_CAP_FAST_FRAME			0x04
/* bits 3-6 reserved */
#define	ATHEROS_CAP_BOOST			0x80

/* Organizationally Unique Identifiers */
/* See http://standards.ieee.org/regauth/oui/oui.txt for a list */
#define ATHEROS_OUI	((const u_int8_t[]){ 0x00, 0x03, 0x7f })
#define BROADCOM_OUI	((const u_int8_t[]){ 0c00, 0x90, 0x4c })
#define IEEE80211_OUI	((const u_int8_t[]){ 0x00, 0x0f, 0xac })
#define MICROSOFT_OUI	((const u_int8_t[]){ 0x00, 0x50, 0xf2 })

/*
 * AUTH management packets
 *
 *	octet algo[2]
 *	octet seq[2]
 *	octet status[2]
 *	octet chal.id
 *	octet chal.length
 *	octet chal.text[253]
 */

#define	IEEE80211_AUTH_ALGORITHM(auth) \
	((auth)[0] | ((auth)[1] << 8))
#define	IEEE80211_AUTH_TRANSACTION(auth) \
	((auth)[2] | ((auth)[3] << 8))
#define	IEEE80211_AUTH_STATUS(auth) \
	((auth)[4] | ((auth)[5] << 8))

#define	IEEE80211_AUTH_ALG_OPEN			0x0000
#define	IEEE80211_AUTH_ALG_SHARED		0x0001
#define	IEEE80211_AUTH_ALG_LEAP			0x0080

enum {
	IEEE80211_AUTH_OPEN_REQUEST		= 1,
	IEEE80211_AUTH_OPEN_RESPONSE		= 2
};

enum {
	IEEE80211_AUTH_SHARED_REQUEST		= 1,
	IEEE80211_AUTH_SHARED_CHALLENGE		= 2,
	IEEE80211_AUTH_SHARED_RESPONSE		= 3,
	IEEE80211_AUTH_SHARED_PASS		= 4
};

/*
 * Reason codes (see Table 22).
 */
enum {
	IEEE80211_REASON_UNSPECIFIED		= 1,
	IEEE80211_REASON_AUTH_EXPIRE		= 2,
	IEEE80211_REASON_AUTH_LEAVE		= 3,
	IEEE80211_REASON_ASSOC_EXPIRE		= 4,
	IEEE80211_REASON_ASSOC_TOOMANY		= 5,
	IEEE80211_REASON_NOT_AUTHED		= 6,
	IEEE80211_REASON_NOT_ASSOCED		= 7,
	IEEE80211_REASON_ASSOC_LEAVE		= 8,
	IEEE80211_REASON_ASSOC_NOT_AUTHED	= 9,

	IEEE80211_REASON_RSN_REQUIRED		= 11,
	IEEE80211_REASON_RSN_INCONSISTENT	= 12,
	IEEE80211_REASON_IE_INVALID		= 13,
	IEEE80211_REASON_MIC_FAILURE		= 14,

	IEEE80211_REASON_BAD_GROUP_CIPHER	= 18,
	IEEE80211_REASON_BAD_PAIRWISE_CIPHER	= 19,
	IEEE80211_REASON_BAD_AKMP		= 20,
	IEEE80211_REASON_RSN_IE_VER_UNSUP	= 21,
	IEEE80211_REASON_RSN_IE_BAD_CAP		= 22,

	IEEE80211_REASON_CIPHER_REJ		= 24
};

/*
 * Status codes (see Table 23).
 */
enum {
	IEEE80211_STATUS_SUCCESS		= 0,
	IEEE80211_STATUS_UNSPECIFIED		= 1,
	IEEE80211_STATUS_CAPINFO		= 10,
	IEEE80211_STATUS_NOT_ASSOCED		= 11,
	IEEE80211_STATUS_OTHER			= 12,
	IEEE80211_STATUS_ALG			= 13,
	IEEE80211_STATUS_SEQUENCE		= 14,
	IEEE80211_STATUS_CHALLENGE		= 15,
	IEEE80211_STATUS_TIMEOUT		= 16,
	IEEE80211_STATUS_TOOMANY		= 17,
	IEEE80211_STATUS_BASIC_RATE		= 18,
	IEEE80211_STATUS_SP_REQUIRED		= 19,
	IEEE80211_STATUS_PBCC_REQUIRED		= 20,
	IEEE80211_STATUS_CA_REQUIRED		= 21,
	IEEE80211_STATUS_TOO_MANY_STATIONS	= 22,
	IEEE80211_STATUS_RATES			= 23,
	IEEE80211_STATUS_SHORTSLOT_REQUIRED	= 25,
	IEEE80211_STATUS_DSSSOFDM_REQUIRED	= 26
};

#define	IEEE80211_WEP_KEYLEN			5	/* 40bit */
#define	IEEE80211_WEP_NKID			4	/* number of key ids */

/* WEP header constants */
#define	IEEE80211_WEP_IVLEN			3	/* 24bit */
#define	IEEE80211_WEP_KIDLEN			1	/* 1 octet */
#define	IEEE80211_WEP_CRCLEN			4	/* CRC-32 */
#define	IEEE80211_CRC_LEN			4
#define	IEEE80211_WEP_TOTLEN		(IEEE80211_WEP_IVLEN + \
					 IEEE80211_WEP_KIDLEN + \
					 IEEE80211_WEP_CRCLEN)

/*
 * 802.11i defines an extended IV for use with non-WEP ciphers.
 * When the EXTIV bit is set in the key id byte an additional
 * 4 bytes immediately follow the IV for TKIP.  For CCMP the
 * EXTIV bit is likewise set but the 8 bytes represent the
 * CCMP header rather than IV+extended-IV.
 */
#define	IEEE80211_WEP_EXTIV		0x20
#define	IEEE80211_WEP_EXTIVLEN		4	/* extended IV length */
#define	IEEE80211_WEP_MICLEN		8	/* trailing MIC */

/*
 * Maximum acceptable MTU is:
 *	IEEE80211_MAX_LEN - WEP overhead - CRC -
 *		QoS overhead - RSN/WPA overhead
 * Min is arbitrarily chosen > IEEE80211_MIN_LEN.  The default
 * mtu is Ethernet-compatible; it's set by ether_ifattach.
 */
#define	IEEE80211_MTU_MAX			2290
#define	IEEE80211_MTU_MIN			32

#define	IEEE80211_MAX_LEN			(2300 + IEEE80211_CRC_LEN + \
    (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_CRCLEN))
#define	IEEE80211_ACK_LEN \
	(sizeof(struct ieee80211_frame_ack) + IEEE80211_CRC_LEN)
#define	IEEE80211_MIN_LEN \
	(sizeof(struct ieee80211_frame_min) + IEEE80211_CRC_LEN)

/*
 * The 802.11 spec says at most 2007 stations may be
 * associated at once.  For most AP's this is way more
 * than is feasible so we use a default of 1800. This
 * number may be overridden by the driver and/or by
 * user configuration.
 */
#define	IEEE80211_AID_MAX		2007
#define	IEEE80211_AID_DEF		1800

#define	IEEE80211_AID(b)		((b) &~ 0xc000)
#define	IEEE80211_AID_SET(b, w) \
	((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32)))
#define	IEEE80211_AID_CLR(b, w) \
	((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32)))
#define	IEEE80211_AID_ISSET(b, w) \
	((w)[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))

/*
 * RTS frame length parameters.  The default is specified in
 * the 802.11 spec.  The max may be wrong for jumbo frames.
 */
#define	IEEE80211_RTS_DEFAULT			512
#define	IEEE80211_RTS_MIN			1
#define	IEEE80211_RTS_MAX			IEEE80211_MAX_LEN

/* One Time Unit (TU) is 1Kus = 1024 microseconds. */
#define IEEE80211_DUR_TU		1024

/* IEEE 802.11b durations for DSSS PHY in microseconds */
#define IEEE80211_DUR_DS_LONG_PREAMBLE	144
#define IEEE80211_DUR_DS_SHORT_PREAMBLE	72
#define	IEEE80211_DUR_DS_PREAMBLE_DIFFERENCE	\
    (IEEE80211_DUR_DS_LONG_PREAMBLE - IEEE80211_DUR_DS_SHORT_PREAMBLE)
#define IEEE80211_DUR_DS_FAST_PLCPHDR	24
#define IEEE80211_DUR_DS_SLOW_PLCPHDR	48
#define	IEEE80211_DUR_DS_PLCPHDR_DIFFERENCE	\
    (IEEE80211_DUR_DS_SLOW_PLCPHDR - IEEE80211_DUR_DS_FAST_PLCPHDR)
#define IEEE80211_DUR_DS_SLOW_ACK	112
#define IEEE80211_DUR_DS_FAST_ACK	56
#define IEEE80211_DUR_DS_SLOW_CTS	112
#define IEEE80211_DUR_DS_FAST_CTS	56
#define IEEE80211_DUR_DS_SLOT		20
#define IEEE80211_DUR_DS_SIFS		10
#define IEEE80211_DUR_DS_PIFS	(IEEE80211_DUR_DS_SIFS + IEEE80211_DUR_DS_SLOT)
#define IEEE80211_DUR_DS_DIFS	(IEEE80211_DUR_DS_SIFS + \
				 2 * IEEE80211_DUR_DS_SLOT)
#define IEEE80211_DUR_DS_EIFS	(IEEE80211_DUR_DS_SIFS + \
				 IEEE80211_DUR_DS_SLOW_ACK + \
				 IEEE80211_DUR_DS_LONG_PREAMBLE + \
				 IEEE80211_DUR_DS_SLOW_PLCPHDR + \
				 IEEE80211_DUR_DIFS)

enum {
	IEEE80211_AUTH_NONE	= 0,
	IEEE80211_AUTH_OPEN	= 1,		/* open */
	IEEE80211_AUTH_SHARED	= 2,		/* shared-key */
	IEEE80211_AUTH_8021X	= 3,		/* 802.1x */
	IEEE80211_AUTH_AUTO	= 4,		/* auto-select/accept */
	IEEE80211_AUTH_WPA	= 5,		/* WPA w/ 802.1x */
	IEEE80211_AUTH_WPA_PSK	= 6,		/* WPA w/ preshared key */
	IEEE80211_AUTH_WPA2	= 7,		/* WPA2 w/ 802.1x */
	IEEE80211_AUTH_WPA2_PSK	= 8		/* WPA2 w/ preshared key */
};

/*
 * The RSNA key descriptor used by IEEE 802.11 does not use the IEEE 802.1X
 * key descriptor.  Instead, it uses the key descriptor described below.
 */
#define EAPOL_KEY_NONCE_LEN	32
#define EAPOL_KEY_IV_LEN	16
#define EAPOL_KEY_MIC_LEN	16

/* from Std 802.11i-2004 section 8.5.2 */
struct ieee80211_eapol_key {
	u_int8_t	type;
/* IEEE Std 802.1X-2004, section 7.6.1 */
#define EAPOL_KEY_TYPE_RC4		1	/* deprecated */
#define EAPOL_KEY_TYPE_IEEE80211	2

	u_int16_t	info;
#define EAPOL_KEY_VERSION_MASK		0x7
#define EAPOL_KEY_VERSION_SHIFT		0
#define EAPOL_KEY_VERSION_MD5_RC4	1
#define EAPOL_KEY_VERSION_SHA1_AES	2
#define EAPOL_KEY_PAIRWISE		(1 <<  3)
#define EAPOL_KEY_INSTALL		(1 <<  6)	/* I */
#define EAPOL_KEY_KEYACK		(1 <<  7)	/* A */
#define EAPOL_KEY_KEYMIC		(1 <<  8)	/* M */
#define EAPOL_KEY_SECURE		(1 <<  9)	/* S */
#define EAPOL_KEY_ERROR			(1 << 10)
#define EAPOL_KEY_REQUEST		(1 << 11)
#define EAPOL_KEY_ENCRYPTED		(1 << 12)

	u_int16_t	keylen;
	u_int64_t	replay_cnt;
	u_int8_t	nonce[EAPOL_KEY_NONCE_LEN];
	u_int8_t	iv[EAPOL_KEY_IV_LEN];
	u_int64_t	rsc;
	u_int8_t	reserved[8];
	u_int8_t	mic[EAPOL_KEY_MIC_LEN];
	u_int16_t	len;
	u_int8_t	data[0];
} __packed;

#endif /* _NET80211_IEEE80211_H_ */