408fec3ff8
This patch replace actual mask stuff using BIT macros with or operators to make use of GENMASK macro which simplifies code clearity and readibility. It applies for defines included in p80211hdr.h header file. Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
214 lines
7 KiB
C
214 lines
7 KiB
C
/* 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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#define WLAN_CTL_FRAMELEN(fstype) (\
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(fstype) == WLAN_FSTYPE_BLOCKACKREQ ? 24 : \
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(fstype) == WLAN_FSTYPE_BLOCKACK ? 152 : \
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(fstype) == WLAN_FSTYPE_PSPOLL ? 20 : \
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(fstype) == WLAN_FSTYPE_RTS ? 20 : \
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(fstype) == WLAN_FSTYPE_CTS ? 14 : \
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(fstype) == WLAN_FSTYPE_ACK ? 14 : \
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(fstype) == WLAN_FSTYPE_CFEND ? 20 : \
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(fstype) == WLAN_FSTYPE_CFENDCFACK ? 20 : 4)
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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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