1 /* src/include/wlan/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 FILE_LICENCE ( GPL2_ONLY );
61
62 #ifndef _P80211HDR_H
63 #define _P80211HDR_H
64
65 /*================================================================*/
66 /* System Includes */
67
68 /*================================================================*/
69 /* Project Includes */
70
71 #ifndef _WLAN_COMPAT_H
72 #include <wlan/wlan_compat.h>
73 #endif
74
75
76 /*================================================================*/
77 /* Constants */
78
79 /*--- Sizes -----------------------------------------------*/
80 #define WLAN_ADDR_LEN 6
81 #define WLAN_CRC_LEN 4
82 #define WLAN_BSSID_LEN 6
83 #define WLAN_BSS_TS_LEN 8
84 #define WLAN_HDR_A3_LEN 24
85 #define WLAN_HDR_A4_LEN 30
86 #define WLAN_SSID_MAXLEN 32
87 #define WLAN_DATA_MAXLEN 2312
88 #define WLAN_A3FR_MAXLEN (WLAN_HDR_A3_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)
89 #define WLAN_A4FR_MAXLEN (WLAN_HDR_A4_LEN + WLAN_DATA_MAXLEN + WLAN_CRC_LEN)
90 #define WLAN_BEACON_FR_MAXLEN (WLAN_HDR_A3_LEN + 334)
91 #define WLAN_ATIM_FR_MAXLEN (WLAN_HDR_A3_LEN + 0)
92 #define WLAN_DISASSOC_FR_MAXLEN (WLAN_HDR_A3_LEN + 2)
93 #define WLAN_ASSOCREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 48)
94 #define WLAN_ASSOCRESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 16)
95 #define WLAN_REASSOCREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 54)
96 #define WLAN_REASSOCRESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 16)
97 #define WLAN_PROBEREQ_FR_MAXLEN (WLAN_HDR_A3_LEN + 44)
98 #define WLAN_PROBERESP_FR_MAXLEN (WLAN_HDR_A3_LEN + 78)
99 #define WLAN_AUTHEN_FR_MAXLEN (WLAN_HDR_A3_LEN + 261)
100 #define WLAN_DEAUTHEN_FR_MAXLEN (WLAN_HDR_A3_LEN + 2)
101 #define WLAN_WEP_NKEYS 4
102 #define WLAN_WEP_MAXKEYLEN 13
103 #define WLAN_CHALLENGE_IE_LEN 130
104 #define WLAN_CHALLENGE_LEN 128
105 #define WLAN_WEP_IV_LEN 4
106 #define WLAN_WEP_ICV_LEN 4
107
108 /*--- Frame Control Field -------------------------------------*/
109 /* Frame Types */
110 #define WLAN_FTYPE_MGMT 0x00
111 #define WLAN_FTYPE_CTL 0x01
112 #define WLAN_FTYPE_DATA 0x02
113
114 /* Frame subtypes */
115 /* Management */
116 #define WLAN_FSTYPE_ASSOCREQ 0x00
117 #define WLAN_FSTYPE_ASSOCRESP 0x01
118 #define WLAN_FSTYPE_REASSOCREQ 0x02
119 #define WLAN_FSTYPE_REASSOCRESP 0x03
120 #define WLAN_FSTYPE_PROBEREQ 0x04
121 #define WLAN_FSTYPE_PROBERESP 0x05
122 #define WLAN_FSTYPE_BEACON 0x08
123 #define WLAN_FSTYPE_ATIM 0x09
124 #define WLAN_FSTYPE_DISASSOC 0x0a
125 #define WLAN_FSTYPE_AUTHEN 0x0b
126 #define WLAN_FSTYPE_DEAUTHEN 0x0c
127
128 /* Control */
129 #define WLAN_FSTYPE_BLOCKACKREQ 0x8
130 #define WLAN_FSTYPE_BLOCKACK 0x9
131 #define WLAN_FSTYPE_PSPOLL 0x0a
132 #define WLAN_FSTYPE_RTS 0x0b
133 #define WLAN_FSTYPE_CTS 0x0c
134 #define WLAN_FSTYPE_ACK 0x0d
135 #define WLAN_FSTYPE_CFEND 0x0e
136 #define WLAN_FSTYPE_CFENDCFACK 0x0f
137
138 /* Data */
139 #define WLAN_FSTYPE_DATAONLY 0x00
140 #define WLAN_FSTYPE_DATA_CFACK 0x01
141 #define WLAN_FSTYPE_DATA_CFPOLL 0x02
142 #define WLAN_FSTYPE_DATA_CFACK_CFPOLL 0x03
143 #define WLAN_FSTYPE_NULL 0x04
144 #define WLAN_FSTYPE_CFACK 0x05
145 #define WLAN_FSTYPE_CFPOLL 0x06
146 #define WLAN_FSTYPE_CFACK_CFPOLL 0x07
147
148
149 /*================================================================*/
150 /* Macros */
151
152 /*--- FC Macros ----------------------------------------------*/
153 /* Macros to get/set the bitfields of the Frame Control Field */
154 /* GET_FC_??? - takes the host byte-order value of an FC */
155 /* and retrieves the value of one of the */
156 /* bitfields and moves that value so its lsb is */
157 /* in bit 0. */
158 /* SET_FC_??? - takes a host order value for one of the FC */
159 /* bitfields and moves it to the proper bit */
160 /* location for ORing into a host order FC. */
161 /* To send the FC produced from SET_FC_???, */
162 /* one must put the bytes in IEEE order. */
163 /* e.g. */
164 /* printf("the frame subtype is %x", */
165 /* GET_FC_FTYPE( ieee2host( rx.fc ))) */
166 /* */
167 /* tx.fc = host2ieee( SET_FC_FTYPE(WLAN_FTYP_CTL) | */
168 /* SET_FC_FSTYPE(WLAN_FSTYPE_RTS) ); */
169 /*------------------------------------------------------------*/
170
171 #define WLAN_GET_FC_PVER(n) (((uint16_t)(n)) & (BIT0 | BIT1))
172 #define WLAN_GET_FC_FTYPE(n) ((((uint16_t)(n)) & (BIT2 | BIT3)) >> 2)
173 #define WLAN_GET_FC_FSTYPE(n) ((((uint16_t)(n)) & (BIT4|BIT5|BIT6|BIT7)) >> 4)
174 #define WLAN_GET_FC_TODS(n) ((((uint16_t)(n)) & (BIT8)) >> 8)
175 #define WLAN_GET_FC_FROMDS(n) ((((uint16_t)(n)) & (BIT9)) >> 9)
176 #define WLAN_GET_FC_MOREFRAG(n) ((((uint16_t)(n)) & (BIT10)) >> 10)
177 #define WLAN_GET_FC_RETRY(n) ((((uint16_t)(n)) & (BIT11)) >> 11)
178 #define WLAN_GET_FC_PWRMGT(n) ((((uint16_t)(n)) & (BIT12)) >> 12)
179 #define WLAN_GET_FC_MOREDATA(n) ((((uint16_t)(n)) & (BIT13)) >> 13)
180 #define WLAN_GET_FC_ISWEP(n) ((((uint16_t)(n)) & (BIT14)) >> 14)
181 #define WLAN_GET_FC_ORDER(n) ((((uint16_t)(n)) & (BIT15)) >> 15)
182
183 #define WLAN_SET_FC_PVER(n) ((uint16_t)(n))
184 #define WLAN_SET_FC_FTYPE(n) (((uint16_t)(n)) << 2)
185 #define WLAN_SET_FC_FSTYPE(n) (((uint16_t)(n)) << 4)
186 #define WLAN_SET_FC_TODS(n) (((uint16_t)(n)) << 8)
187 #define WLAN_SET_FC_FROMDS(n) (((uint16_t)(n)) << 9)
188 #define WLAN_SET_FC_MOREFRAG(n) (((uint16_t)(n)) << 10)
189 #define WLAN_SET_FC_RETRY(n) (((uint16_t)(n)) << 11)
190 #define WLAN_SET_FC_PWRMGT(n) (((uint16_t)(n)) << 12)
191 #define WLAN_SET_FC_MOREDATA(n) (((uint16_t)(n)) << 13)
192 #define WLAN_SET_FC_ISWEP(n) (((uint16_t)(n)) << 14)
193 #define WLAN_SET_FC_ORDER(n) (((uint16_t)(n)) << 15)
194
195 /*--- Duration Macros ----------------------------------------*/
196 /* Macros to get/set the bitfields of the Duration Field */
197 /* - the duration value is only valid when bit15 is zero */
198 /* - the firmware handles these values, so I'm not going */
199 /* these macros right now. */
200 /*------------------------------------------------------------*/
201
202 /*--- Sequence Control Macros -------------------------------*/
203 /* Macros to get/set the bitfields of the Sequence Control */
204 /* Field. */
205 /*------------------------------------------------------------*/
206 #define WLAN_GET_SEQ_FRGNUM(n) (((uint16_t)(n)) & (BIT0|BIT1|BIT2|BIT3))
207 #define WLAN_GET_SEQ_SEQNUM(n) ((((uint16_t)(n)) & (~(BIT0|BIT1|BIT2|BIT3))) >> 4)
208
209 /*--- Data ptr macro -----------------------------------------*/
210 /* Creates a uint8_t* to the data portion of a frame */
211 /* Assumes you're passing in a ptr to the beginning of the hdr*/
212 /*------------------------------------------------------------*/
213 #define WLAN_HDR_A3_DATAP(p) (((uint8_t*)(p)) + WLAN_HDR_A3_LEN)
214 #define WLAN_HDR_A4_DATAP(p) (((uint8_t*)(p)) + WLAN_HDR_A4_LEN)
215
216 #define DOT11_RATE5_ISBASIC_GET(r) (((uint8_t)(r)) & BIT7)
217
218 /*================================================================*/
219 /* Types */
220
221 /* BSS Timestamp */
222 typedef uint8_t wlan_bss_ts_t[WLAN_BSS_TS_LEN];
223
224 /* Generic 802.11 Header types */
225
226 typedef struct p80211_hdr_a3
227 {
228 uint16_t fc;
229 uint16_t dur;
230 uint8_t a1[WLAN_ADDR_LEN];
231 uint8_t a2[WLAN_ADDR_LEN];
232 uint8_t a3[WLAN_ADDR_LEN];
233 uint16_t seq;
234 } __WLAN_ATTRIB_PACK__ p80211_hdr_a3_t;
235
236 typedef struct p80211_hdr_a4
237 {
238 uint16_t fc;
239 uint16_t dur;
240 uint8_t a1[WLAN_ADDR_LEN];
241 uint8_t a2[WLAN_ADDR_LEN];
242 uint8_t a3[WLAN_ADDR_LEN];
243 uint16_t seq;
244 uint8_t a4[WLAN_ADDR_LEN];
245 } __WLAN_ATTRIB_PACK__ p80211_hdr_a4_t;
246
247 typedef union p80211_hdr
248 {
249 p80211_hdr_a3_t a3;
250 p80211_hdr_a4_t a4;
251 } __WLAN_ATTRIB_PACK__ p80211_hdr_t;
252
253
254 /*================================================================*/
255 /* Extern Declarations */
256
257
258 /*================================================================*/
259 /* Function Declarations */
260
261 /* Frame and header length macros */
262
263 #define WLAN_CTL_FRAMELEN(fstype) (\
264 (fstype) == WLAN_FSTYPE_BLOCKACKREQ ? 24 : \
265 (fstype) == WLAN_FSTYPE_BLOCKACK ? 152 : \
266 (fstype) == WLAN_FSTYPE_PSPOLL ? 20 : \
267 (fstype) == WLAN_FSTYPE_RTS ? 20 : \
268 (fstype) == WLAN_FSTYPE_CTS ? 14 : \
269 (fstype) == WLAN_FSTYPE_ACK ? 14 : \
270 (fstype) == WLAN_FSTYPE_CFEND ? 20 : \
271 (fstype) == WLAN_FSTYPE_CFENDCFACK ? 20 : 4)
272
273 #define WLAN_FCS_LEN 4
274
275 /* ftcl in HOST order */
p80211_headerlen(uint16_t fctl)276 inline static uint16_t p80211_headerlen(uint16_t fctl)
277 {
278 uint16_t hdrlen = 0;
279
280 switch ( WLAN_GET_FC_FTYPE(fctl) ) {
281 case WLAN_FTYPE_MGMT:
282 hdrlen = WLAN_HDR_A3_LEN;
283 break;
284 case WLAN_FTYPE_DATA:
285 hdrlen = WLAN_HDR_A3_LEN;
286 if ( WLAN_GET_FC_TODS(fctl) && WLAN_GET_FC_FROMDS(fctl) ) {
287 hdrlen += WLAN_ADDR_LEN;
288 }
289 break;
290 case WLAN_FTYPE_CTL:
291 hdrlen = WLAN_CTL_FRAMELEN(WLAN_GET_FC_FSTYPE(fctl)) -
292 WLAN_FCS_LEN;
293 break;
294 default:
295 hdrlen = WLAN_HDR_A3_LEN;
296 }
297
298 return hdrlen;
299 }
300
301 #endif /* _P80211HDR_H */
302