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/* p80211hdr.h
*
* Macros, types, and functions for handling 802.11 MAC headers
*
* Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved.
* --------------------------------------------------------------------
*
* linux-wlan
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License version 2 (the "GPL"), in which
* case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use
* your version of this file under the MPL, indicate your decision
* by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* --------------------------------------------------------------------
*
* Inquiries regarding the linux-wlan Open Source project can be
* made directly to:
*
* AbsoluteValue Systems Inc.
* info@linux-wlan.com
* http://www.linux-wlan.com
*
* --------------------------------------------------------------------
*
* Portions of the development of this software were funded by
* Intersil Corporation as part of PRISM(R) chipset product development.
*
* --------------------------------------------------------------------
*
* This file declares the constants and types used in the interface
* between a wlan driver and the user mode utilities.
*
* Note:
* - Constant values are always in HOST byte order. To assign
* values to multi-byte fields they _must_ be converted to
* ieee byte order. To retrieve multi-byte values from incoming
* frames, they must be converted to host order.
*
* All functions declared here are implemented in p80211.c
* --------------------------------------------------------------------
*/
#ifndef _P80211HDR_H
#define _P80211HDR_H
/*================================================================*/
/* System Includes */
/*================================================================*/
/* Project Includes */
#ifndef _WLAN_COMPAT_H
#include "wlan_compat.h"
#endif
/*================================================================*/
/* Constants */
/*--- Sizes -----------------------------------------------*/
#define WLAN_ADDR_LEN 6
#define WLAN_CRC_LEN 4
#define WLAN_BSSID_LEN 6
#define WLAN_BSS_TS_LEN 8
#define WLAN_HDR_A3_LEN 24
#define WLAN_HDR_A4_LEN 30
#define WLAN_SSID_MAXLEN 32
#define WLAN_DATA_MAXLEN 2312
#define WLAN_A3FR_MAXLEN (WLAN_HDR_A3_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)
#define WLAN_A4FR_MAXLEN (WLAN_HDR_A4_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)
#define WLAN_BEACON_FR_MAXLEN (WLAN_HDR_A3_LEN + 334)
#define WLAN_ATIM_FR_MAXLEN (WLAN_HDR_A3_LEN + 0)
#define WLAN_DISASSOC_FR_MAXLEN (WLAN_HDR_A3_LEN + 2)
#define WLAN_ASSOCREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 48)
#define WLAN_ASSOCRESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 16)
#define WLAN_REASSOCREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 54)
#define WLAN_REASSOCRESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 16)
#define WLAN_PROBEREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 44)
#define WLAN_PROBERESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 78)
#define WLAN_AUTHEN_FR_MAXLEN (WLAN_HDR_A3_LEN + 261)
#define WLAN_DEAUTHEN_FR_MAXLEN (WLAN_HDR_A3_LEN + 2)
#define WLAN_WEP_NKEYS 4
#define WLAN_WEP_MAXKEYLEN 13
#define WLAN_CHALLENGE_IE_LEN 130
#define WLAN_CHALLENGE_LEN 128
#define WLAN_WEP_IV_LEN 4
#define WLAN_WEP_ICV_LEN 4
/*--- Frame Control Field -------------------------------------*/
/* Frame Types */
#define WLAN_FTYPE_MGMT 0x00
#define WLAN_FTYPE_CTL 0x01
#define WLAN_FTYPE_DATA 0x02
/* Frame subtypes */
/* Management */
#define WLAN_FSTYPE_ASSOCREQ 0x00
#define WLAN_FSTYPE_ASSOCRESP 0x01
#define WLAN_FSTYPE_REASSOCREQ 0x02
#define WLAN_FSTYPE_REASSOCRESP 0x03
#define WLAN_FSTYPE_PROBEREQ 0x04
#define WLAN_FSTYPE_PROBERESP 0x05
#define WLAN_FSTYPE_BEACON 0x08
#define WLAN_FSTYPE_ATIM 0x09
#define WLAN_FSTYPE_DISASSOC 0x0a
#define WLAN_FSTYPE_AUTHEN 0x0b
#define WLAN_FSTYPE_DEAUTHEN 0x0c
/* Control */
#define WLAN_FSTYPE_BLOCKACKREQ 0x8
#define WLAN_FSTYPE_BLOCKACK 0x9
#define WLAN_FSTYPE_PSPOLL 0x0a
#define WLAN_FSTYPE_RTS 0x0b
#define WLAN_FSTYPE_CTS 0x0c
#define WLAN_FSTYPE_ACK 0x0d
#define WLAN_FSTYPE_CFEND 0x0e
#define WLAN_FSTYPE_CFENDCFACK 0x0f
/* Data */
#define WLAN_FSTYPE_DATAONLY 0x00
#define WLAN_FSTYPE_DATA_CFACK 0x01
#define WLAN_FSTYPE_DATA_CFPOLL 0x02
#define WLAN_FSTYPE_DATA_CFACK_CFPOLL 0x03
#define WLAN_FSTYPE_NULL 0x04
#define WLAN_FSTYPE_CFACK 0x05
#define WLAN_FSTYPE_CFPOLL 0x06
#define WLAN_FSTYPE_CFACK_CFPOLL 0x07
/*================================================================*/
/* Macros */
/*--- FC Macros ----------------------------------------------*/
/* Macros to get/set the bitfields of the Frame Control Field */
/* GET_FC_??? - takes the host byte-order value of an FC */
/* and retrieves the value of one of the */
/* bitfields and moves that value so its lsb is */
/* in bit 0. */
/* SET_FC_??? - takes a host order value for one of the FC */
/* bitfields and moves it to the proper bit */
/* location for ORing into a host order FC. */
/* To send the FC produced from SET_FC_???, */
/* one must put the bytes in IEEE order. */
/* e.g. */
/* printf("the frame subtype is %x", */
/* GET_FC_FTYPE( ieee2host( rx.fc ))) */
/* */
/* tx.fc = host2ieee( SET_FC_FTYPE(WLAN_FTYP_CTL) | */
/* SET_FC_FSTYPE(WLAN_FSTYPE_RTS) ); */
/*------------------------------------------------------------*/
#define WLAN_GET_FC_PVER(n) (((u16)(n)) & (BIT0 | BIT1))
#define WLAN_GET_FC_FTYPE(n) ((((u16)(n)) & (BIT2 | BIT3)) >> 2)
#define WLAN_GET_FC_FSTYPE(n) ((((u16)(n)) & (BIT4|BIT5|BIT6|BIT7)) >> 4)
#define WLAN_GET_FC_TODS(n) ((((u16)(n)) & (BIT8)) >> 8)
#define WLAN_GET_FC_FROMDS(n) ((((u16)(n)) & (BIT9)) >> 9)
#define WLAN_GET_FC_MOREFRAG(n) ((((u16)(n)) & (BIT10)) >> 10)
#define WLAN_GET_FC_RETRY(n) ((((u16)(n)) & (BIT11)) >> 11)
#define WLAN_GET_FC_PWRMGT(n) ((((u16)(n)) & (BIT12)) >> 12)
#define WLAN_GET_FC_MOREDATA(n) ((((u16)(n)) & (BIT13)) >> 13)
#define WLAN_GET_FC_ISWEP(n) ((((u16)(n)) & (BIT14)) >> 14)
#define WLAN_GET_FC_ORDER(n) ((((u16)(n)) & (BIT15)) >> 15)
#define WLAN_SET_FC_PVER(n) ((u16)(n))
#define WLAN_SET_FC_FTYPE(n) (((u16)(n)) << 2)
#define WLAN_SET_FC_FSTYPE(n) (((u16)(n)) << 4)
#define WLAN_SET_FC_TODS(n) (((u16)(n)) << 8)
#define WLAN_SET_FC_FROMDS(n) (((u16)(n)) << 9)
#define WLAN_SET_FC_MOREFRAG(n) (((u16)(n)) << 10)
#define WLAN_SET_FC_RETRY(n) (((u16)(n)) << 11)
#define WLAN_SET_FC_PWRMGT(n) (((u16)(n)) << 12)
#define WLAN_SET_FC_MOREDATA(n) (((u16)(n)) << 13)
#define WLAN_SET_FC_ISWEP(n) (((u16)(n)) << 14)
#define WLAN_SET_FC_ORDER(n) (((u16)(n)) << 15)
/*--- Duration Macros ----------------------------------------*/
/* Macros to get/set the bitfields of the Duration Field */
/* - the duration value is only valid when bit15 is zero */
/* - the firmware handles these values, so I'm not going */
/* these macros right now. */
/*------------------------------------------------------------*/
/*--- Sequence Control Macros -------------------------------*/
/* Macros to get/set the bitfields of the Sequence Control */
/* Field. */
/*------------------------------------------------------------*/
#define WLAN_GET_SEQ_FRGNUM(n) (((u16)(n)) & (BIT0|BIT1|BIT2|BIT3))
#define WLAN_GET_SEQ_SEQNUM(n) ((((u16)(n)) & (~(BIT0|BIT1|BIT2|BIT3))) >> 4)
/*--- Data ptr macro -----------------------------------------*/
/* Creates a u8* to the data portion of a frame */
/* Assumes you're passing in a ptr to the beginning of the hdr*/
/*------------------------------------------------------------*/
#define WLAN_HDR_A3_DATAP(p) (((u8*)(p)) + WLAN_HDR_A3_LEN)
#define WLAN_HDR_A4_DATAP(p) (((u8*)(p)) + WLAN_HDR_A4_LEN)
#define DOT11_RATE5_ISBASIC_GET(r) (((u8)(r)) & BIT7)
/*================================================================*/
/* Types */
/* BSS Timestamp */
typedef u8 wlan_bss_ts_t[WLAN_BSS_TS_LEN];
/* Generic 802.11 Header types */
typedef struct p80211_hdr_a3
{
u16 fc;
u16 dur;
u8 a1[WLAN_ADDR_LEN];
u8 a2[WLAN_ADDR_LEN];
u8 a3[WLAN_ADDR_LEN];
u16 seq;
} __WLAN_ATTRIB_PACK__ p80211_hdr_a3_t;
typedef struct p80211_hdr_a4
{
u16 fc;
u16 dur;
u8 a1[WLAN_ADDR_LEN];
u8 a2[WLAN_ADDR_LEN];
u8 a3[WLAN_ADDR_LEN];
u16 seq;
u8 a4[WLAN_ADDR_LEN];
} __WLAN_ATTRIB_PACK__ p80211_hdr_a4_t;
typedef union p80211_hdr
{
p80211_hdr_a3_t a3;
p80211_hdr_a4_t a4;
} __WLAN_ATTRIB_PACK__ p80211_hdr_t;
/*================================================================*/
/* Extern Declarations */
/*================================================================*/
/* Function Declarations */
/* Frame and header lenght macros */
#define WLAN_CTL_FRAMELEN(fstype) (\
(fstype) == WLAN_FSTYPE_BLOCKACKREQ ? 24 : \
(fstype) == WLAN_FSTYPE_BLOCKACK ? 152 : \
(fstype) == WLAN_FSTYPE_PSPOLL ? 20 : \
(fstype) == WLAN_FSTYPE_RTS ? 20 : \
(fstype) == WLAN_FSTYPE_CTS ? 14 : \
(fstype) == WLAN_FSTYPE_ACK ? 14 : \
(fstype) == WLAN_FSTYPE_CFEND ? 20 : \
(fstype) == WLAN_FSTYPE_CFENDCFACK ? 20 : 4)
#define WLAN_FCS_LEN 4
/* ftcl in HOST order */
inline static u16 p80211_headerlen(u16 fctl)
{
u16 hdrlen = 0;
switch ( WLAN_GET_FC_FTYPE(fctl) ) {
case WLAN_FTYPE_MGMT:
hdrlen = WLAN_HDR_A3_LEN;
break;
case WLAN_FTYPE_DATA:
hdrlen = WLAN_HDR_A3_LEN;
if ( WLAN_GET_FC_TODS(fctl) && WLAN_GET_FC_FROMDS(fctl) ) {
hdrlen += WLAN_ADDR_LEN;
}
break;
case WLAN_FTYPE_CTL:
hdrlen = WLAN_CTL_FRAMELEN(WLAN_GET_FC_FSTYPE(fctl)) -
WLAN_FCS_LEN;
break;
default:
hdrlen = WLAN_HDR_A3_LEN;
}
return hdrlen;
}
#endif /* _P80211HDR_H */
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