Root/drivers/staging/wlan-ng/p80211hdr.h

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} __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} __packed;
168
169union p80211_hdr {
170    struct p80211_hdr_a3 a3;
171    struct p80211_hdr_a4 a4;
172} __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

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