1/* p80211hdr.h 2* 3* Macros, types, and functions for handling 802.11 MAC headers 4* 5* Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved. 6* -------------------------------------------------------------------- 7* 8* linux-wlan 9* 10* The contents of this file are subject to the Mozilla Public 11* License Version 1.1 (the "License"); you may not use this file 12* except in compliance with the License. You may obtain a copy of 13* the License at http://www.mozilla.org/MPL/ 14* 15* Software distributed under the License is distributed on an "AS 16* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 17* implied. See the License for the specific language governing 18* rights and limitations under the License. 19* 20* Alternatively, the contents of this file may be used under the 21* terms of the GNU Public License version 2 (the "GPL"), in which 22* case the provisions of the GPL are applicable instead of the 23* above. If you wish to allow the use of your version of this file 24* only under the terms of the GPL and not to allow others to use 25* your version of this file under the MPL, indicate your decision 26* by deleting the provisions above and replace them with the notice 27* and other provisions required by the GPL. If you do not delete 28* the provisions above, a recipient may use your version of this 29* file under either the MPL or the GPL. 30* 31* -------------------------------------------------------------------- 32* 33* Inquiries regarding the linux-wlan Open Source project can be 34* made directly to: 35* 36* AbsoluteValue Systems Inc. 37* info@linux-wlan.com 38* http://www.linux-wlan.com 39* 40* -------------------------------------------------------------------- 41* 42* Portions of the development of this software were funded by 43* Intersil Corporation as part of PRISM(R) chipset product development. 44* 45* -------------------------------------------------------------------- 46* 47* This file declares the constants and types used in the interface 48* between a wlan driver and the user mode utilities. 49* 50* Note: 51* - Constant values are always in HOST byte order. To assign 52* values to multi-byte fields they _must_ be converted to 53* ieee byte order. To retrieve multi-byte values from incoming 54* frames, they must be converted to host order. 55* 56* All functions declared here are implemented in p80211.c 57* -------------------------------------------------------------------- 58*/ 59 60#ifndef _P80211HDR_H 61#define _P80211HDR_H 62 63#include <linux/if_ether.h> 64 65/*--- Sizes -----------------------------------------------*/ 66#define WLAN_CRC_LEN 4 67#define WLAN_BSSID_LEN 6 68#define WLAN_HDR_A3_LEN 24 69#define WLAN_HDR_A4_LEN 30 70#define WLAN_SSID_MAXLEN 32 71#define WLAN_DATA_MAXLEN 2312 72#define WLAN_WEP_IV_LEN 4 73#define WLAN_WEP_ICV_LEN 4 74 75/*--- Frame Control Field -------------------------------------*/ 76/* Frame Types */ 77#define WLAN_FTYPE_MGMT 0x00 78#define WLAN_FTYPE_CTL 0x01 79#define WLAN_FTYPE_DATA 0x02 80 81/* Frame subtypes */ 82/* Management */ 83#define WLAN_FSTYPE_ASSOCREQ 0x00 84#define WLAN_FSTYPE_ASSOCRESP 0x01 85#define WLAN_FSTYPE_REASSOCREQ 0x02 86#define WLAN_FSTYPE_REASSOCRESP 0x03 87#define WLAN_FSTYPE_PROBEREQ 0x04 88#define WLAN_FSTYPE_PROBERESP 0x05 89#define WLAN_FSTYPE_BEACON 0x08 90#define WLAN_FSTYPE_ATIM 0x09 91#define WLAN_FSTYPE_DISASSOC 0x0a 92#define WLAN_FSTYPE_AUTHEN 0x0b 93#define WLAN_FSTYPE_DEAUTHEN 0x0c 94 95/* Control */ 96#define WLAN_FSTYPE_BLOCKACKREQ 0x8 97#define WLAN_FSTYPE_BLOCKACK 0x9 98#define WLAN_FSTYPE_PSPOLL 0x0a 99#define WLAN_FSTYPE_RTS 0x0b 100#define WLAN_FSTYPE_CTS 0x0c 101#define WLAN_FSTYPE_ACK 0x0d 102#define WLAN_FSTYPE_CFEND 0x0e 103#define WLAN_FSTYPE_CFENDCFACK 0x0f 104 105/* Data */ 106#define WLAN_FSTYPE_DATAONLY 0x00 107#define WLAN_FSTYPE_DATA_CFACK 0x01 108#define WLAN_FSTYPE_DATA_CFPOLL 0x02 109#define WLAN_FSTYPE_DATA_CFACK_CFPOLL 0x03 110#define WLAN_FSTYPE_NULL 0x04 111#define WLAN_FSTYPE_CFACK 0x05 112#define WLAN_FSTYPE_CFPOLL 0x06 113#define WLAN_FSTYPE_CFACK_CFPOLL 0x07 114 115/*--- FC Macros ----------------------------------------------*/ 116/* Macros to get/set the bitfields of the Frame Control Field */ 117/* GET_FC_??? - takes the host byte-order value of an FC */ 118/* and retrieves the value of one of the */ 119/* bitfields and moves that value so its lsb is */ 120/* in bit 0. */ 121/* SET_FC_??? - takes a host order value for one of the FC */ 122/* bitfields and moves it to the proper bit */ 123/* location for ORing into a host order FC. */ 124/* To send the FC produced from SET_FC_???, */ 125/* one must put the bytes in IEEE order. */ 126/* e.g. */ 127/* printf("the frame subtype is %x", */ 128/* GET_FC_FTYPE( ieee2host( rx.fc ))) */ 129/* */ 130/* tx.fc = host2ieee( SET_FC_FTYPE(WLAN_FTYP_CTL) | */ 131/* SET_FC_FSTYPE(WLAN_FSTYPE_RTS) ); */ 132/*------------------------------------------------------------*/ 133 134#define WLAN_GET_FC_FTYPE(n) ((((u16)(n)) & (BIT(2) | BIT(3))) >> 2) 135#define WLAN_GET_FC_FSTYPE(n) ((((u16)(n)) & (BIT(4)|BIT(5)|BIT(6)|BIT(7))) >> 4) 136#define WLAN_GET_FC_TODS(n) ((((u16)(n)) & (BIT(8))) >> 8) 137#define WLAN_GET_FC_FROMDS(n) ((((u16)(n)) & (BIT(9))) >> 9) 138#define WLAN_GET_FC_ISWEP(n) ((((u16)(n)) & (BIT(14))) >> 14) 139 140#define WLAN_SET_FC_FTYPE(n) (((u16)(n)) << 2) 141#define WLAN_SET_FC_FSTYPE(n) (((u16)(n)) << 4) 142#define WLAN_SET_FC_TODS(n) (((u16)(n)) << 8) 143#define WLAN_SET_FC_FROMDS(n) (((u16)(n)) << 9) 144#define WLAN_SET_FC_ISWEP(n) (((u16)(n)) << 14) 145 146#define DOT11_RATE5_ISBASIC_GET(r) (((u8)(r)) & BIT(7)) 147 148/* Generic 802.11 Header types */ 149 150struct p80211_hdr_a3 { 151 u16 fc; 152 u16 dur; 153 u8 a1[ETH_ALEN]; 154 u8 a2[ETH_ALEN]; 155 u8 a3[ETH_ALEN]; 156 u16 seq; 157} __attribute__ ((packed)); 158 159struct p80211_hdr_a4 { 160 u16 fc; 161 u16 dur; 162 u8 a1[ETH_ALEN]; 163 u8 a2[ETH_ALEN]; 164 u8 a3[ETH_ALEN]; 165 u16 seq; 166 u8 a4[ETH_ALEN]; 167} __attribute__ ((packed)); 168 169union p80211_hdr { 170 struct p80211_hdr_a3 a3; 171 struct p80211_hdr_a4 a4; 172} __attribute__ ((packed)); 173 174/* Frame and header length macros */ 175 176#define WLAN_CTL_FRAMELEN(fstype) (\ 177 (fstype) == WLAN_FSTYPE_BLOCKACKREQ ? 24 : \ 178 (fstype) == WLAN_FSTYPE_BLOCKACK ? 152 : \ 179 (fstype) == WLAN_FSTYPE_PSPOLL ? 20 : \ 180 (fstype) == WLAN_FSTYPE_RTS ? 20 : \ 181 (fstype) == WLAN_FSTYPE_CTS ? 14 : \ 182 (fstype) == WLAN_FSTYPE_ACK ? 14 : \ 183 (fstype) == WLAN_FSTYPE_CFEND ? 20 : \ 184 (fstype) == WLAN_FSTYPE_CFENDCFACK ? 20 : 4) 185 186#define WLAN_FCS_LEN 4 187 188/* ftcl in HOST order */ 189static inline u16 p80211_headerlen(u16 fctl) 190{ 191 u16 hdrlen = 0; 192 193 switch (WLAN_GET_FC_FTYPE(fctl)) { 194 case WLAN_FTYPE_MGMT: 195 hdrlen = WLAN_HDR_A3_LEN; 196 break; 197 case WLAN_FTYPE_DATA: 198 hdrlen = WLAN_HDR_A3_LEN; 199 if (WLAN_GET_FC_TODS(fctl) && WLAN_GET_FC_FROMDS(fctl)) 200 hdrlen += ETH_ALEN; 201 break; 202 case WLAN_FTYPE_CTL: 203 hdrlen = WLAN_CTL_FRAMELEN(WLAN_GET_FC_FSTYPE(fctl)) - 204 WLAN_FCS_LEN; 205 break; 206 default: 207 hdrlen = WLAN_HDR_A3_LEN; 208 } 209 210 return hdrlen; 211} 212 213#endif /* _P80211HDR_H */ 214