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/* SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1) */
/*
*
* Macros, types, and functions for handling 802.11 MAC headers
*
* Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved.
* --------------------------------------------------------------------
*
* linux-wlan
*
* --------------------------------------------------------------------
*
* 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
#include <linux/if_ether.h>
/*--- Sizes -----------------------------------------------*/
#define WLAN_CRC_LEN 4
#define WLAN_BSSID_LEN 6
#define WLAN_HDR_A3_LEN 24
#define WLAN_HDR_A4_LEN 30
#define WLAN_SSID_MAXLEN 32
#define WLAN_DATA_MAXLEN 2312
#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
/*--- 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_FTYPE(n) ((((u16)(n)) & GENMASK(3, 2)) >> 2)
#define WLAN_GET_FC_FSTYPE(n) ((((u16)(n)) & GENMASK(7, 4)) >> 4)
#define WLAN_GET_FC_TODS(n) ((((u16)(n)) & (BIT(8))) >> 8)
#define WLAN_GET_FC_FROMDS(n) ((((u16)(n)) & (BIT(9))) >> 9)
#define WLAN_GET_FC_ISWEP(n) ((((u16)(n)) & (BIT(14))) >> 14)
#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_ISWEP(n) (((u16)(n)) << 14)
#define DOT11_RATE5_ISBASIC_GET(r) (((u8)(r)) & BIT(7))
/* Generic 802.11 Header types */
struct p80211_hdr {
__le16 frame_control;
u16 duration_id;
u8 address1[ETH_ALEN];
u8 address2[ETH_ALEN];
u8 address3[ETH_ALEN];
u16 sequence_control;
u8 address4[ETH_ALEN];
} __packed;
/* Frame and header length macros */
static inline u16 wlan_ctl_framelen(u16 fstype)
{
switch (fstype) {
case WLAN_FSTYPE_BLOCKACKREQ:
return 24;
case WLAN_FSTYPE_BLOCKACK:
return 152;
case WLAN_FSTYPE_PSPOLL:
case WLAN_FSTYPE_RTS:
case WLAN_FSTYPE_CFEND:
case WLAN_FSTYPE_CFENDCFACK:
return 20;
case WLAN_FSTYPE_CTS:
case WLAN_FSTYPE_ACK:
return 14;
default:
return 4;
}
}
#define WLAN_FCS_LEN 4
/* ftcl in HOST order */
static inline 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 += ETH_ALEN;
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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