/* SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1) */
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/* p80211hdr.h
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*
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* Macros, types, and functions for handling 802.11 MAC headers
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*
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* Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved.
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* --------------------------------------------------------------------
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*
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* linux-wlan
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License version 2 (the "GPL"), in which
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* case the provisions of the GPL are applicable instead of the
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* above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use
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* your version of this file under the MPL, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the MPL or the GPL.
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*
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* --------------------------------------------------------------------
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*
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* Inquiries regarding the linux-wlan Open Source project can be
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* made directly to:
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*
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* AbsoluteValue Systems Inc.
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* info@linux-wlan.com
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* http://www.linux-wlan.com
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*
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* --------------------------------------------------------------------
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*
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* Portions of the development of this software were funded by
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* Intersil Corporation as part of PRISM(R) chipset product development.
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*
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* --------------------------------------------------------------------
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*
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* This file declares the constants and types used in the interface
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* between a wlan driver and the user mode utilities.
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*
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* Note:
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* - Constant values are always in HOST byte order. To assign
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* values to multi-byte fields they _must_ be converted to
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* ieee byte order. To retrieve multi-byte values from incoming
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* frames, they must be converted to host order.
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*
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* All functions declared here are implemented in p80211.c
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* --------------------------------------------------------------------
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*/
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#ifndef _P80211HDR_H
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#define _P80211HDR_H
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#include <linux/if_ether.h>
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/*--- Sizes -----------------------------------------------*/
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#define WLAN_CRC_LEN 4
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#define WLAN_BSSID_LEN 6
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#define WLAN_HDR_A3_LEN 24
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#define WLAN_HDR_A4_LEN 30
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#define WLAN_SSID_MAXLEN 32
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#define WLAN_DATA_MAXLEN 2312
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#define WLAN_WEP_IV_LEN 4
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#define WLAN_WEP_ICV_LEN 4
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/*--- Frame Control Field -------------------------------------*/
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/* Frame Types */
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#define WLAN_FTYPE_MGMT 0x00
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#define WLAN_FTYPE_CTL 0x01
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#define WLAN_FTYPE_DATA 0x02
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/* Frame subtypes */
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/* Management */
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#define WLAN_FSTYPE_ASSOCREQ 0x00
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#define WLAN_FSTYPE_ASSOCRESP 0x01
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#define WLAN_FSTYPE_REASSOCREQ 0x02
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#define WLAN_FSTYPE_REASSOCRESP 0x03
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#define WLAN_FSTYPE_PROBEREQ 0x04
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#define WLAN_FSTYPE_PROBERESP 0x05
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#define WLAN_FSTYPE_BEACON 0x08
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#define WLAN_FSTYPE_ATIM 0x09
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#define WLAN_FSTYPE_DISASSOC 0x0a
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#define WLAN_FSTYPE_AUTHEN 0x0b
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#define WLAN_FSTYPE_DEAUTHEN 0x0c
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/* Control */
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#define WLAN_FSTYPE_BLOCKACKREQ 0x8
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#define WLAN_FSTYPE_BLOCKACK 0x9
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#define WLAN_FSTYPE_PSPOLL 0x0a
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#define WLAN_FSTYPE_RTS 0x0b
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#define WLAN_FSTYPE_CTS 0x0c
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#define WLAN_FSTYPE_ACK 0x0d
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#define WLAN_FSTYPE_CFEND 0x0e
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#define WLAN_FSTYPE_CFENDCFACK 0x0f
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/* Data */
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#define WLAN_FSTYPE_DATAONLY 0x00
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#define WLAN_FSTYPE_DATA_CFACK 0x01
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#define WLAN_FSTYPE_DATA_CFPOLL 0x02
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#define WLAN_FSTYPE_DATA_CFACK_CFPOLL 0x03
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#define WLAN_FSTYPE_NULL 0x04
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#define WLAN_FSTYPE_CFACK 0x05
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#define WLAN_FSTYPE_CFPOLL 0x06
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#define WLAN_FSTYPE_CFACK_CFPOLL 0x07
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/*--- FC Macros ----------------------------------------------*/
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/* Macros to get/set the bitfields of the Frame Control Field */
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/* GET_FC_??? - takes the host byte-order value of an FC */
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/* and retrieves the value of one of the */
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/* bitfields and moves that value so its lsb is */
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/* in bit 0. */
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/* SET_FC_??? - takes a host order value for one of the FC */
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/* bitfields and moves it to the proper bit */
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/* location for ORing into a host order FC. */
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/* To send the FC produced from SET_FC_???, */
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/* one must put the bytes in IEEE order. */
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/* e.g. */
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/* printf("the frame subtype is %x", */
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/* GET_FC_FTYPE( ieee2host( rx.fc ))) */
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/* */
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/* tx.fc = host2ieee( SET_FC_FTYPE(WLAN_FTYP_CTL) | */
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/* SET_FC_FSTYPE(WLAN_FSTYPE_RTS) ); */
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/*------------------------------------------------------------*/
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#define WLAN_GET_FC_FTYPE(n) ((((u16)(n)) & GENMASK(3, 2)) >> 2)
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#define WLAN_GET_FC_FSTYPE(n) ((((u16)(n)) & GENMASK(7, 4)) >> 4)
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#define WLAN_GET_FC_TODS(n) ((((u16)(n)) & (BIT(8))) >> 8)
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#define WLAN_GET_FC_FROMDS(n) ((((u16)(n)) & (BIT(9))) >> 9)
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#define WLAN_GET_FC_ISWEP(n) ((((u16)(n)) & (BIT(14))) >> 14)
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#define WLAN_SET_FC_FTYPE(n) (((u16)(n)) << 2)
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#define WLAN_SET_FC_FSTYPE(n) (((u16)(n)) << 4)
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#define WLAN_SET_FC_TODS(n) (((u16)(n)) << 8)
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#define WLAN_SET_FC_FROMDS(n) (((u16)(n)) << 9)
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#define WLAN_SET_FC_ISWEP(n) (((u16)(n)) << 14)
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#define DOT11_RATE5_ISBASIC_GET(r) (((u8)(r)) & BIT(7))
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/* Generic 802.11 Header types */
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struct p80211_hdr_a3 {
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__le16 fc;
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u16 dur;
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u8 a1[ETH_ALEN];
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u8 a2[ETH_ALEN];
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u8 a3[ETH_ALEN];
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u16 seq;
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} __packed;
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struct p80211_hdr_a4 {
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u16 fc;
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u16 dur;
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u8 a1[ETH_ALEN];
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u8 a2[ETH_ALEN];
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u8 a3[ETH_ALEN];
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u16 seq;
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u8 a4[ETH_ALEN];
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} __packed;
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union p80211_hdr {
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struct p80211_hdr_a3 a3;
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struct p80211_hdr_a4 a4;
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} __packed;
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/* Frame and header length macros */
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static inline u16 wlan_ctl_framelen(u16 fstype)
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{
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switch (fstype) {
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case WLAN_FSTYPE_BLOCKACKREQ:
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return 24;
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case WLAN_FSTYPE_BLOCKACK:
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return 152;
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case WLAN_FSTYPE_PSPOLL:
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case WLAN_FSTYPE_RTS:
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case WLAN_FSTYPE_CFEND:
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case WLAN_FSTYPE_CFENDCFACK:
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return 20;
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case WLAN_FSTYPE_CTS:
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case WLAN_FSTYPE_ACK:
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return 14;
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default:
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return 4;
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}
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}
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#define WLAN_FCS_LEN 4
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/* ftcl in HOST order */
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static inline u16 p80211_headerlen(u16 fctl)
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{
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u16 hdrlen = 0;
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switch (WLAN_GET_FC_FTYPE(fctl)) {
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case WLAN_FTYPE_MGMT:
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hdrlen = WLAN_HDR_A3_LEN;
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break;
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case WLAN_FTYPE_DATA:
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hdrlen = WLAN_HDR_A3_LEN;
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if (WLAN_GET_FC_TODS(fctl) && WLAN_GET_FC_FROMDS(fctl))
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hdrlen += ETH_ALEN;
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break;
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case WLAN_FTYPE_CTL:
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hdrlen = wlan_ctl_framelen(WLAN_GET_FC_FSTYPE(fctl)) -
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WLAN_FCS_LEN;
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break;
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default:
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hdrlen = WLAN_HDR_A3_LEN;
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}
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return hdrlen;
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}
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#endif /* _P80211HDR_H */
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