The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211.h

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * Alternatively, this software may be distributed under the terms of the
   18  * GNU General Public License ("GPL") version 2 as published by the Free
   19  * Software Foundation.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/5.2/sys/net80211/ieee80211.h 120098 2003-09-15 19:36:34Z sam $
   33  */
   34 #ifndef _NET80211_IEEE80211_H_
   35 #define _NET80211_IEEE80211_H_
   36 
   37 /*
   38  * 802.11 protocol definitions.
   39  */
   40 
   41 #define IEEE80211_ADDR_LEN      6               /* size of 802.11 address */
   42 /* is 802.11 address multicast/broadcast? */
   43 #define IEEE80211_IS_MULTICAST(_a)      (*(_a) & 0x01)
   44 
   45 /* IEEE 802.11 PLCP header */
   46 struct ieee80211_plcp_hdr {
   47         u_int16_t       i_sfd;
   48         u_int8_t        i_signal;
   49         u_int8_t        i_service;
   50         u_int16_t       i_length;
   51         u_int16_t       i_crc;
   52 } __attribute__((__packed__));
   53 
   54 /*
   55  * generic definitions for IEEE 802.11 frames
   56  */
   57 struct ieee80211_frame {
   58         u_int8_t        i_fc[2];
   59         u_int8_t        i_dur[2];
   60         u_int8_t        i_addr1[IEEE80211_ADDR_LEN];
   61         u_int8_t        i_addr2[IEEE80211_ADDR_LEN];
   62         u_int8_t        i_addr3[IEEE80211_ADDR_LEN];
   63         u_int8_t        i_seq[2];
   64         /* possibly followed by addr4[IEEE80211_ADDR_LEN]; */
   65         /* see below */
   66 } __attribute__((__packed__));
   67 
   68 struct ieee80211_frame_addr4 {
   69         u_int8_t        i_fc[2];
   70         u_int8_t        i_dur[2];
   71         u_int8_t        i_addr1[IEEE80211_ADDR_LEN];
   72         u_int8_t        i_addr2[IEEE80211_ADDR_LEN];
   73         u_int8_t        i_addr3[IEEE80211_ADDR_LEN];
   74         u_int8_t        i_seq[2];
   75         u_int8_t        i_addr4[IEEE80211_ADDR_LEN];
   76 } __attribute__((__packed__));
   77 
   78 #define IEEE80211_FC0_VERSION_MASK              0x03
   79 #define IEEE80211_FC0_VERSION_SHIFT             0
   80 #define IEEE80211_FC0_VERSION_0                 0x00
   81 #define IEEE80211_FC0_TYPE_MASK                 0x0c
   82 #define IEEE80211_FC0_TYPE_SHIFT                2
   83 #define IEEE80211_FC0_TYPE_MGT                  0x00
   84 #define IEEE80211_FC0_TYPE_CTL                  0x04
   85 #define IEEE80211_FC0_TYPE_DATA                 0x08
   86 
   87 #define IEEE80211_FC0_SUBTYPE_MASK              0xf0
   88 #define IEEE80211_FC0_SUBTYPE_SHIFT             4
   89 /* for TYPE_MGT */
   90 #define IEEE80211_FC0_SUBTYPE_ASSOC_REQ         0x00
   91 #define IEEE80211_FC0_SUBTYPE_ASSOC_RESP        0x10
   92 #define IEEE80211_FC0_SUBTYPE_REASSOC_REQ       0x20
   93 #define IEEE80211_FC0_SUBTYPE_REASSOC_RESP      0x30
   94 #define IEEE80211_FC0_SUBTYPE_PROBE_REQ         0x40
   95 #define IEEE80211_FC0_SUBTYPE_PROBE_RESP        0x50
   96 #define IEEE80211_FC0_SUBTYPE_BEACON            0x80
   97 #define IEEE80211_FC0_SUBTYPE_ATIM              0x90
   98 #define IEEE80211_FC0_SUBTYPE_DISASSOC          0xa0
   99 #define IEEE80211_FC0_SUBTYPE_AUTH              0xb0
  100 #define IEEE80211_FC0_SUBTYPE_DEAUTH            0xc0
  101 /* for TYPE_CTL */
  102 #define IEEE80211_FC0_SUBTYPE_PS_POLL           0xa0
  103 #define IEEE80211_FC0_SUBTYPE_RTS               0xb0
  104 #define IEEE80211_FC0_SUBTYPE_CTS               0xc0
  105 #define IEEE80211_FC0_SUBTYPE_ACK               0xd0
  106 #define IEEE80211_FC0_SUBTYPE_CF_END            0xe0
  107 #define IEEE80211_FC0_SUBTYPE_CF_END_ACK        0xf0
  108 /* for TYPE_DATA (bit combination) */
  109 #define IEEE80211_FC0_SUBTYPE_DATA              0x00
  110 #define IEEE80211_FC0_SUBTYPE_CF_ACK            0x10
  111 #define IEEE80211_FC0_SUBTYPE_CF_POLL           0x20
  112 #define IEEE80211_FC0_SUBTYPE_CF_ACPL           0x30
  113 #define IEEE80211_FC0_SUBTYPE_NODATA            0x40
  114 #define IEEE80211_FC0_SUBTYPE_CFACK             0x50
  115 #define IEEE80211_FC0_SUBTYPE_CFPOLL            0x60
  116 #define IEEE80211_FC0_SUBTYPE_CF_ACK_CF_ACK     0x70
  117 
  118 #define IEEE80211_FC1_DIR_MASK                  0x03
  119 #define IEEE80211_FC1_DIR_NODS                  0x00    /* STA->STA */
  120 #define IEEE80211_FC1_DIR_TODS                  0x01    /* STA->AP  */
  121 #define IEEE80211_FC1_DIR_FROMDS                0x02    /* AP ->STA */
  122 #define IEEE80211_FC1_DIR_DSTODS                0x03    /* AP ->AP  */
  123 
  124 #define IEEE80211_FC1_MORE_FRAG                 0x04
  125 #define IEEE80211_FC1_RETRY                     0x08
  126 #define IEEE80211_FC1_PWR_MGT                   0x10
  127 #define IEEE80211_FC1_MORE_DATA                 0x20
  128 #define IEEE80211_FC1_WEP                       0x40
  129 #define IEEE80211_FC1_ORDER                     0x80
  130 
  131 #define IEEE80211_SEQ_FRAG_MASK                 0x000f
  132 #define IEEE80211_SEQ_FRAG_SHIFT                0
  133 #define IEEE80211_SEQ_SEQ_MASK                  0xfff0
  134 #define IEEE80211_SEQ_SEQ_SHIFT                 4
  135 
  136 #define IEEE80211_NWID_LEN                      32
  137 
  138 /*
  139  * Control frames.
  140  */
  141 struct ieee80211_frame_min {
  142         u_int8_t        i_fc[2];
  143         u_int8_t        i_dur[2];
  144         u_int8_t        i_addr1[IEEE80211_ADDR_LEN];
  145         u_int8_t        i_addr2[IEEE80211_ADDR_LEN];
  146         /* FCS */
  147 } __attribute__((__packed__));
  148 
  149 struct ieee80211_frame_rts {
  150         u_int8_t        i_fc[2];
  151         u_int8_t        i_dur[2];
  152         u_int8_t        i_ra[IEEE80211_ADDR_LEN];
  153         u_int8_t        i_ta[IEEE80211_ADDR_LEN];
  154         /* FCS */
  155 } __attribute__((__packed__));
  156 
  157 struct ieee80211_frame_cts {
  158         u_int8_t        i_fc[2];
  159         u_int8_t        i_dur[2];
  160         u_int8_t        i_ra[IEEE80211_ADDR_LEN];
  161         /* FCS */
  162 } __attribute__((__packed__));
  163 
  164 struct ieee80211_frame_ack {
  165         u_int8_t        i_fc[2];
  166         u_int8_t        i_dur[2];
  167         u_int8_t        i_ra[IEEE80211_ADDR_LEN];
  168         /* FCS */
  169 } __attribute__((__packed__));
  170 
  171 struct ieee80211_frame_pspoll {
  172         u_int8_t        i_fc[2];
  173         u_int8_t        i_aid[2];
  174         u_int8_t        i_bssid[IEEE80211_ADDR_LEN];
  175         u_int8_t        i_ta[IEEE80211_ADDR_LEN];
  176         /* FCS */
  177 } __attribute__((__packed__));
  178 
  179 struct ieee80211_frame_cfend {          /* NB: also CF-End+CF-Ack */
  180         u_int8_t        i_fc[2];
  181         u_int8_t        i_dur[2];       /* should be zero */
  182         u_int8_t        i_ra[IEEE80211_ADDR_LEN];
  183         u_int8_t        i_bssid[IEEE80211_ADDR_LEN];
  184         /* FCS */
  185 } __attribute__((__packed__));
  186 
  187 /*
  188  * BEACON management packets
  189  *
  190  *      octet timestamp[8]
  191  *      octet beacon interval[2]
  192  *      octet capability information[2]
  193  *      information element
  194  *              octet elemid
  195  *              octet length
  196  *              octet information[length]
  197  */
  198 
  199 typedef uint8_t *ieee80211_mgt_beacon_t;
  200 
  201 #define IEEE80211_BEACON_INTERVAL(beacon) \
  202         ((beacon)[8] | ((beacon)[9] << 8))
  203 #define IEEE80211_BEACON_CAPABILITY(beacon) \
  204         ((beacon)[10] | ((beacon)[11] << 8))
  205 
  206 #define IEEE80211_CAPINFO_ESS                   0x0001
  207 #define IEEE80211_CAPINFO_IBSS                  0x0002
  208 #define IEEE80211_CAPINFO_CF_POLLABLE           0x0004
  209 #define IEEE80211_CAPINFO_CF_POLLREQ            0x0008
  210 #define IEEE80211_CAPINFO_PRIVACY               0x0010
  211 #define IEEE80211_CAPINFO_SHORT_PREAMBLE        0x0020
  212 #define IEEE80211_CAPINFO_PBCC                  0x0040
  213 #define IEEE80211_CAPINFO_CHNL_AGILITY          0x0080
  214 /* bits 8-9 are reserved */
  215 #define IEEE80211_CAPINFO_SHORT_SLOTTIME        0x0400
  216 /* bits 11-12 are reserved */
  217 #define IEEE80211_CAPINFO_DSSSOFDM              0x2000
  218 /* bits 14-15 are reserved */
  219 
  220 /*
  221  * Management information elements
  222  */
  223 struct ieee80211_information {
  224         char    ssid[IEEE80211_NWID_LEN+1];
  225         struct rates {
  226                 u_int8_t        *p;
  227         } rates;
  228         struct fh {
  229                 u_int16_t       dwell;
  230                 u_int8_t        set;
  231                 u_int8_t        pattern;
  232                 u_int8_t        index;
  233         } fh;
  234         struct ds {
  235                 u_int8_t        channel;
  236         } ds;
  237         struct cf {
  238                 u_int8_t        count;
  239                 u_int8_t        period;
  240                 u_int8_t        maxdur[2];
  241                 u_int8_t        dur[2];
  242         } cf;
  243         struct tim {
  244                 u_int8_t        count;
  245                 u_int8_t        period;
  246                 u_int8_t        bitctl;
  247                 /* u_int8_t     pvt[251]; The driver needs to use this. */
  248         } tim;
  249         struct ibss {
  250                 u_int16_t       atim;
  251         } ibss;
  252         struct challenge {
  253                 u_int8_t        *p;
  254                 u_int8_t        len;
  255         } challenge;
  256         struct erp {
  257                 u_int8_t        flags;
  258         } erp;
  259 };
  260 
  261 enum {
  262         IEEE80211_ELEMID_SSID                   = 0,
  263         IEEE80211_ELEMID_RATES                  = 1,
  264         IEEE80211_ELEMID_FHPARMS                = 2,
  265         IEEE80211_ELEMID_DSPARMS                = 3,
  266         IEEE80211_ELEMID_CFPARMS                = 4,
  267         IEEE80211_ELEMID_TIM                    = 5,
  268         IEEE80211_ELEMID_IBSSPARMS              = 6,
  269         IEEE80211_ELEMID_COUNTRY                = 7,
  270         IEEE80211_ELEMID_CHALLENGE              = 16,
  271         IEEE80211_ELEMID_ERP                    = 42,
  272         IEEE80211_ELEMID_XRATES                 = 50,
  273 };
  274 
  275 #define IEEE80211_RATE_BASIC                    0x80
  276 #define IEEE80211_RATE_VAL                      0x7f
  277 
  278 /* EPR information element flags */
  279 #define IEEE80211_ERP_NON_ERP_PRESENT           0x01
  280 #define IEEE80211_ERP_USE_PROTECTION            0x02
  281 #define IEEE80211_ERP_BARKER_MODE               0x04
  282 
  283 /*
  284  * AUTH management packets
  285  *
  286  *      octet algo[2]
  287  *      octet seq[2]
  288  *      octet status[2]
  289  *      octet chal.id
  290  *      octet chal.length
  291  *      octet chal.text[253]
  292  */
  293 
  294 typedef u_int8_t *ieee80211_mgt_auth_t;
  295 
  296 #define IEEE80211_AUTH_ALGORITHM(auth) \
  297         ((auth)[0] | ((auth)[1] << 8))
  298 #define IEEE80211_AUTH_TRANSACTION(auth) \
  299         ((auth)[2] | ((auth)[3] << 8))
  300 #define IEEE80211_AUTH_STATUS(auth) \
  301         ((auth)[4] | ((auth)[5] << 8))
  302 
  303 #define IEEE80211_AUTH_ALG_OPEN                 0x0000
  304 #define IEEE80211_AUTH_ALG_SHARED               0x0001
  305 
  306 enum {
  307         IEEE80211_AUTH_OPEN_REQUEST             = 1,
  308         IEEE80211_AUTH_OPEN_RESPONSE            = 2,
  309 };
  310 
  311 enum {
  312         IEEE80211_AUTH_SHARED_REQUEST           = 1,
  313         IEEE80211_AUTH_SHARED_CHALLENGE         = 2,
  314         IEEE80211_AUTH_SHARED_RESPONSE          = 3,
  315         IEEE80211_AUTH_SHARED_PASS              = 4,
  316 };
  317 
  318 /*
  319  * Reason codes
  320  *
  321  * Unlisted codes are reserved
  322  */
  323 
  324 enum {
  325         IEEE80211_REASON_UNSPECIFIED            = 1,
  326         IEEE80211_REASON_AUTH_EXPIRE            = 2,
  327         IEEE80211_REASON_AUTH_LEAVE             = 3,
  328         IEEE80211_REASON_ASSOC_EXPIRE           = 4,
  329         IEEE80211_REASON_ASSOC_TOOMANY          = 5,
  330         IEEE80211_REASON_NOT_AUTHED             = 6,
  331         IEEE80211_REASON_NOT_ASSOCED            = 7,
  332         IEEE80211_REASON_ASSOC_LEAVE            = 8,
  333         IEEE80211_REASON_ASSOC_NOT_AUTHED       = 9,
  334 
  335         IEEE80211_STATUS_SUCCESS                = 0,
  336         IEEE80211_STATUS_UNSPECIFIED            = 1,
  337         IEEE80211_STATUS_CAPINFO                = 10,
  338         IEEE80211_STATUS_NOT_ASSOCED            = 11,
  339         IEEE80211_STATUS_OTHER                  = 12,
  340         IEEE80211_STATUS_ALG                    = 13,
  341         IEEE80211_STATUS_SEQUENCE               = 14,
  342         IEEE80211_STATUS_CHALLENGE              = 15,
  343         IEEE80211_STATUS_TIMEOUT                = 16,
  344         IEEE80211_STATUS_TOOMANY                = 17,
  345         IEEE80211_STATUS_BASIC_RATE             = 18,
  346         IEEE80211_STATUS_SP_REQUIRED            = 19,
  347         IEEE80211_STATUS_PBCC_REQUIRED          = 20,
  348         IEEE80211_STATUS_CA_REQUIRED            = 21,
  349         IEEE80211_STATUS_TOO_MANY_STATIONS      = 22,
  350         IEEE80211_STATUS_RATES                  = 23,
  351         IEEE80211_STATUS_SHORTSLOT_REQUIRED     = 25,
  352         IEEE80211_STATUS_DSSSOFDM_REQUIRED      = 26,
  353 };
  354 
  355 #define IEEE80211_WEP_KEYLEN                    5       /* 40bit */
  356 #define IEEE80211_WEP_IVLEN                     3       /* 24bit */
  357 #define IEEE80211_WEP_KIDLEN                    1       /* 1 octet */
  358 #define IEEE80211_WEP_CRCLEN                    4       /* CRC-32 */
  359 #define IEEE80211_WEP_NKID                      4       /* number of key ids */
  360 
  361 #define IEEE80211_CRC_LEN                       4
  362 
  363 #define IEEE80211_MTU                           1500
  364 #define IEEE80211_MAX_LEN                       (2300 + IEEE80211_CRC_LEN + \
  365     (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_CRCLEN))
  366 #define IEEE80211_MIN_LEN \
  367         (sizeof(struct ieee80211_frame_min) + IEEE80211_CRC_LEN)
  368 
  369 /* 
  370  * RTS frame length parameters.  The default is specified in
  371  * the 802.11 spec.  The max may be wrong for jumbo frames.
  372  */
  373 #define IEEE80211_RTS_DEFAULT                   512
  374 #define IEEE80211_RTS_MIN                       1
  375 #define IEEE80211_RTS_MAX                       IEEE80211_MAX_LEN
  376 
  377 enum {
  378         IEEE80211_AUTH_NONE     = 0,
  379         IEEE80211_AUTH_OPEN     = 1,
  380         IEEE80211_AUTH_SHARED   = 2,
  381 };
  382 
  383 #endif /* _NET80211_IEEE80211_H_ */

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