Luca's patch ported

[cbs-scheduler.git] / include / linux / wireless.h

/*
 * This file define a set of standard wireless extensions
 *
 * Version :    22      16.3.07
 *
 * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
 */

#ifndef _LINUX_WIRELESS_H
#define _LINUX_WIRELESS_H

/************************** DOCUMENTATION **************************/
/*
 * Initial APIs (1996 -> onward) :
 * -----------------------------
 * Basically, the wireless extensions are for now a set of standard ioctl
 * call + /proc/net/wireless
 *
 * The entry /proc/net/wireless give statistics and information on the
 * driver.
 * This is better than having each driver having its entry because
 * its centralised and we may remove the driver module safely.
 *
 * Ioctl are used to configure the driver and issue commands.  This is
 * better than command line options of insmod because we may want to
 * change dynamically (while the driver is running) some parameters.
 *
 * The ioctl mechanimsm are copied from standard devices ioctl.
 * We have the list of command plus a structure descibing the
 * data exchanged...
 * Note that to add these ioctl, I was obliged to modify :
 *      # net/core/dev.c (two place + add include)
 *      # net/ipv4/af_inet.c (one place + add include)
 *
 * /proc/net/wireless is a copy of /proc/net/dev.
 * We have a structure for data passed from the driver to /proc/net/wireless
 * Too add this, I've modified :
 *      # net/core/dev.c (two other places)
 *      # include/linux/netdevice.h (one place)
 *      # include/linux/proc_fs.h (one place)
 *
 * New driver API (2002 -> onward) :
 * -------------------------------
 * This file is only concerned with the user space API and common definitions.
 * The new driver API is defined and documented in :
 *      # include/net/iw_handler.h
 *
 * Note as well that /proc/net/wireless implementation has now moved in :
 *      # net/core/wireless.c
 *
 * Wireless Events (2002 -> onward) :
 * --------------------------------
 * Events are defined at the end of this file, and implemented in :
 *      # net/core/wireless.c
 *
 * Other comments :
 * --------------
 * Do not add here things that are redundant with other mechanisms
 * (drivers init, ifconfig, /proc/net/dev, ...) and with are not
 * wireless specific.
 *
 * These wireless extensions are not magic : each driver has to provide
 * support for them...
 *
 * IMPORTANT NOTE : As everything in the kernel, this is very much a
 * work in progress. Contact me if you have ideas of improvements...
 */

/***************************** INCLUDES *****************************/

#include <linux/types.h>                /* for __u* and __s* typedefs */
#include <linux/socket.h>               /* for "struct sockaddr" et al  */
#include <linux/if.h>                   /* for IFNAMSIZ and co... */

/***************************** VERSION *****************************/
/*
 * This constant is used to know the availability of the wireless
 * extensions and to know which version of wireless extensions it is
 * (there is some stuff that will be added in the future...)
 * I just plan to increment with each new version.
 */
#define WIRELESS_EXT    22

/*
 * Changes :
 *
 * V2 to V3
 * --------
 *      Alan Cox start some incompatibles changes. I've integrated a bit more.
 *      - Encryption renamed to Encode to avoid US regulation problems
 *      - Frequency changed from float to struct to avoid problems on old 386
 *
 * V3 to V4
 * --------
 *      - Add sensitivity
 *
 * V4 to V5
 * --------
 *      - Missing encoding definitions in range
 *      - Access points stuff
 *
 * V5 to V6
 * --------
 *      - 802.11 support (ESSID ioctls)
 *
 * V6 to V7
 * --------
 *      - define IW_ESSID_MAX_SIZE and IW_MAX_AP
 *
 * V7 to V8
 * --------
 *      - Changed my e-mail address
 *      - More 802.11 support (nickname, rate, rts, frag)
 *      - List index in frequencies
 *
 * V8 to V9
 * --------
 *      - Support for 'mode of operation' (ad-hoc, managed...)
 *      - Support for unicast and multicast power saving
 *      - Change encoding to support larger tokens (>64 bits)
 *      - Updated iw_params (disable, flags) and use it for NWID
 *      - Extracted iw_point from iwreq for clarity
 *
 * V9 to V10
 * ---------
 *      - Add PM capability to range structure
 *      - Add PM modifier : MAX/MIN/RELATIVE
 *      - Add encoding option : IW_ENCODE_NOKEY
 *      - Add TxPower ioctls (work like TxRate)
 *
 * V10 to V11
 * ----------
 *      - Add WE version in range (help backward/forward compatibility)
 *      - Add retry ioctls (work like PM)
 *
 * V11 to V12
 * ----------
 *      - Add SIOCSIWSTATS to get /proc/net/wireless programatically
 *      - Add DEV PRIVATE IOCTL to avoid collisions in SIOCDEVPRIVATE space
 *      - Add new statistics (frag, retry, beacon)
 *      - Add average quality (for user space calibration)
 *
 * V12 to V13
 * ----------
 *      - Document creation of new driver API.
 *      - Extract union iwreq_data from struct iwreq (for new driver API).
 *      - Rename SIOCSIWNAME as SIOCSIWCOMMIT
 *
 * V13 to V14
 * ----------
 *      - Wireless Events support : define struct iw_event
 *      - Define additional specific event numbers
 *      - Add "addr" and "param" fields in union iwreq_data
 *      - AP scanning stuff (SIOCSIWSCAN and friends)
 *
 * V14 to V15
 * ----------
 *      - Add IW_PRIV_TYPE_ADDR for struct sockaddr private arg
 *      - Make struct iw_freq signed (both m & e), add explicit padding
 *      - Add IWEVCUSTOM for driver specific event/scanning token
 *      - Add IW_MAX_GET_SPY for driver returning a lot of addresses
 *      - Add IW_TXPOW_RANGE for range of Tx Powers
 *      - Add IWEVREGISTERED & IWEVEXPIRED events for Access Points
 *      - Add IW_MODE_MONITOR for passive monitor
 *
 * V15 to V16
 * ----------
 *      - Increase the number of bitrates in iw_range to 32 (for 802.11g)
 *      - Increase the number of frequencies in iw_range to 32 (for 802.11b+a)
 *      - Reshuffle struct iw_range for increases, add filler
 *      - Increase IW_MAX_AP to 64 for driver returning a lot of addresses
 *      - Remove IW_MAX_GET_SPY because conflict with enhanced spy support
 *      - Add SIOCSIWTHRSPY/SIOCGIWTHRSPY and "struct iw_thrspy"
 *      - Add IW_ENCODE_TEMP and iw_range->encoding_login_index
 *
 * V16 to V17
 * ----------
 *      - Add flags to frequency -> auto/fixed
 *      - Document (struct iw_quality *)->updated, add new flags (INVALID)
 *      - Wireless Event capability in struct iw_range
 *      - Add support for relative TxPower (yick !)
 *
 * V17 to V18 (From Jouni Malinen <j@w1.fi>)
 * ----------
 *      - Add support for WPA/WPA2
 *      - Add extended encoding configuration (SIOCSIWENCODEEXT and
 *        SIOCGIWENCODEEXT)
 *      - Add SIOCSIWGENIE/SIOCGIWGENIE
 *      - Add SIOCSIWMLME
 *      - Add SIOCSIWPMKSA
 *      - Add struct iw_range bit field for supported encoding capabilities
 *      - Add optional scan request parameters for SIOCSIWSCAN
 *      - Add SIOCSIWAUTH/SIOCGIWAUTH for setting authentication and WPA
 *        related parameters (extensible up to 4096 parameter values)
 *      - Add wireless events: IWEVGENIE, IWEVMICHAELMICFAILURE,
 *        IWEVASSOCREQIE, IWEVASSOCRESPIE, IWEVPMKIDCAND
 *
 * V18 to V19
 * ----------
 *      - Remove (struct iw_point *)->pointer from events and streams
 *      - Remove header includes to help user space
 *      - Increase IW_ENCODING_TOKEN_MAX from 32 to 64
 *      - Add IW_QUAL_ALL_UPDATED and IW_QUAL_ALL_INVALID macros
 *      - Add explicit flag to tell stats are in dBm : IW_QUAL_DBM
 *      - Add IW_IOCTL_IDX() and IW_EVENT_IDX() macros
 *
 * V19 to V20
 * ----------
 *      - RtNetlink requests support (SET/GET)
 *
 * V20 to V21
 * ----------
 *      - Remove (struct net_device *)->get_wireless_stats()
 *      - Change length in ESSID and NICK to strlen() instead of strlen()+1
 *      - Add IW_RETRY_SHORT/IW_RETRY_LONG retry modifiers
 *      - Power/Retry relative values no longer * 100000
 *      - Add explicit flag to tell stats are in 802.11k RCPI : IW_QUAL_RCPI
 *
 * V21 to V22
 * ----------
 *      - Prevent leaking of kernel space in stream on 64 bits.
 */

/**************************** CONSTANTS ****************************/

/* -------------------------- IOCTL LIST -------------------------- */

/* Wireless Identification */
#define SIOCSIWCOMMIT   0x8B00          /* Commit pending changes to driver */
#define SIOCGIWNAME     0x8B01          /* get name == wireless protocol */
/* SIOCGIWNAME is used to verify the presence of Wireless Extensions.
 * Common values : "IEEE 802.11-DS", "IEEE 802.11-FH", "IEEE 802.11b"...
 * Don't put the name of your driver there, it's useless. */

/* Basic operations */
#define SIOCSIWNWID     0x8B02          /* set network id (pre-802.11) */
#define SIOCGIWNWID     0x8B03          /* get network id (the cell) */
#define SIOCSIWFREQ     0x8B04          /* set channel/frequency (Hz) */
#define SIOCGIWFREQ     0x8B05          /* get channel/frequency (Hz) */
#define SIOCSIWMODE     0x8B06          /* set operation mode */
#define SIOCGIWMODE     0x8B07          /* get operation mode */
#define SIOCSIWSENS     0x8B08          /* set sensitivity (dBm) */
#define SIOCGIWSENS     0x8B09          /* get sensitivity (dBm) */

/* Informative stuff */
#define SIOCSIWRANGE    0x8B0A          /* Unused */
#define SIOCGIWRANGE    0x8B0B          /* Get range of parameters */
#define SIOCSIWPRIV     0x8B0C          /* Unused */
#define SIOCGIWPRIV     0x8B0D          /* get private ioctl interface info */
#define SIOCSIWSTATS    0x8B0E          /* Unused */
#define SIOCGIWSTATS    0x8B0F          /* Get /proc/net/wireless stats */
/* SIOCGIWSTATS is strictly used between user space and the kernel, and
 * is never passed to the driver (i.e. the driver will never see it). */

/* Spy support (statistics per MAC address - used for Mobile IP support) */
#define SIOCSIWSPY      0x8B10          /* set spy addresses */
#define SIOCGIWSPY      0x8B11          /* get spy info (quality of link) */
#define SIOCSIWTHRSPY   0x8B12          /* set spy threshold (spy event) */
#define SIOCGIWTHRSPY   0x8B13          /* get spy threshold */

/* Access Point manipulation */
#define SIOCSIWAP       0x8B14          /* set access point MAC addresses */
#define SIOCGIWAP       0x8B15          /* get access point MAC addresses */
#define SIOCGIWAPLIST   0x8B17          /* Deprecated in favor of scanning */
#define SIOCSIWSCAN     0x8B18          /* trigger scanning (list cells) */
#define SIOCGIWSCAN     0x8B19          /* get scanning results */

/* 802.11 specific support */
#define SIOCSIWESSID    0x8B1A          /* set ESSID (network name) */
#define SIOCGIWESSID    0x8B1B          /* get ESSID */
#define SIOCSIWNICKN    0x8B1C          /* set node name/nickname */
#define SIOCGIWNICKN    0x8B1D          /* get node name/nickname */
/* As the ESSID and NICKN are strings up to 32 bytes long, it doesn't fit
 * within the 'iwreq' structure, so we need to use the 'data' member to
 * point to a string in user space, like it is done for RANGE... */

/* Other parameters useful in 802.11 and some other devices */
#define SIOCSIWRATE     0x8B20          /* set default bit rate (bps) */
#define SIOCGIWRATE     0x8B21          /* get default bit rate (bps) */
#define SIOCSIWRTS      0x8B22          /* set RTS/CTS threshold (bytes) */
#define SIOCGIWRTS      0x8B23          /* get RTS/CTS threshold (bytes) */
#define SIOCSIWFRAG     0x8B24          /* set fragmentation thr (bytes) */
#define SIOCGIWFRAG     0x8B25          /* get fragmentation thr (bytes) */
#define SIOCSIWTXPOW    0x8B26          /* set transmit power (dBm) */
#define SIOCGIWTXPOW    0x8B27          /* get transmit power (dBm) */
#define SIOCSIWRETRY    0x8B28          /* set retry limits and lifetime */
#define SIOCGIWRETRY    0x8B29          /* get retry limits and lifetime */

/* Encoding stuff (scrambling, hardware security, WEP...) */
#define SIOCSIWENCODE   0x8B2A          /* set encoding token & mode */
#define SIOCGIWENCODE   0x8B2B          /* get encoding token & mode */
/* Power saving stuff (power management, unicast and multicast) */
#define SIOCSIWPOWER    0x8B2C          /* set Power Management settings */
#define SIOCGIWPOWER    0x8B2D          /* get Power Management settings */

/* WPA : Generic IEEE 802.11 informatiom element (e.g., for WPA/RSN/WMM).
 * This ioctl uses struct iw_point and data buffer that includes IE id and len
 * fields. More than one IE may be included in the request. Setting the generic
 * IE to empty buffer (len=0) removes the generic IE from the driver. Drivers
 * are allowed to generate their own WPA/RSN IEs, but in these cases, drivers
 * are required to report the used IE as a wireless event, e.g., when
 * associating with an AP. */
#define SIOCSIWGENIE    0x8B30          /* set generic IE */
#define SIOCGIWGENIE    0x8B31          /* get generic IE */

/* WPA : IEEE 802.11 MLME requests */
#define SIOCSIWMLME     0x8B16          /* request MLME operation; uses
                                         * struct iw_mlme */
/* WPA : Authentication mode parameters */
#define SIOCSIWAUTH     0x8B32          /* set authentication mode params */
#define SIOCGIWAUTH     0x8B33          /* get authentication mode params */

/* WPA : Extended version of encoding configuration */
#define SIOCSIWENCODEEXT 0x8B34         /* set encoding token & mode */
#define SIOCGIWENCODEEXT 0x8B35         /* get encoding token & mode */

/* WPA2 : PMKSA cache management */
#define SIOCSIWPMKSA    0x8B36          /* PMKSA cache operation */

/* -------------------- DEV PRIVATE IOCTL LIST -------------------- */

/* These 32 ioctl are wireless device private, for 16 commands.
 * Each driver is free to use them for whatever purpose it chooses,
 * however the driver *must* export the description of those ioctls
 * with SIOCGIWPRIV and *must* use arguments as defined below.
 * If you don't follow those rules, DaveM is going to hate you (reason :
 * it make mixed 32/64bit operation impossible).
 */
#define SIOCIWFIRSTPRIV 0x8BE0
#define SIOCIWLASTPRIV  0x8BFF
/* Previously, we were using SIOCDEVPRIVATE, but we now have our
 * separate range because of collisions with other tools such as
 * 'mii-tool'.
 * We now have 32 commands, so a bit more space ;-).
 * Also, all 'even' commands are only usable by root and don't return the
 * content of ifr/iwr to user (but you are not obliged to use the set/get
 * convention, just use every other two command). More details in iwpriv.c.
 * And I repeat : you are not forced to use them with iwpriv, but you
 * must be compliant with it.
 */

/* ------------------------- IOCTL STUFF ------------------------- */

/* The first and the last (range) */
#define SIOCIWFIRST     0x8B00
#define SIOCIWLAST      SIOCIWLASTPRIV          /* 0x8BFF */
#define IW_IOCTL_IDX(cmd)       ((cmd) - SIOCIWFIRST)

/* Odd : get (world access), even : set (root access) */
#define IW_IS_SET(cmd)  (!((cmd) & 0x1))
#define IW_IS_GET(cmd)  ((cmd) & 0x1)

/* ----------------------- WIRELESS EVENTS ----------------------- */
/* Those are *NOT* ioctls, do not issue request on them !!! */
/* Most events use the same identifier as ioctl requests */

#define IWEVTXDROP      0x8C00          /* Packet dropped to excessive retry */
#define IWEVQUAL        0x8C01          /* Quality part of statistics (scan) */
#define IWEVCUSTOM      0x8C02          /* Driver specific ascii string */
#define IWEVREGISTERED  0x8C03          /* Discovered a new node (AP mode) */
#define IWEVEXPIRED     0x8C04          /* Expired a node (AP mode) */
#define IWEVGENIE       0x8C05          /* Generic IE (WPA, RSN, WMM, ..)
                                         * (scan results); This includes id and
                                         * length fields. One IWEVGENIE may
                                         * contain more than one IE. Scan
                                         * results may contain one or more
                                         * IWEVGENIE events. */
#define IWEVMICHAELMICFAILURE 0x8C06    /* Michael MIC failure
                                         * (struct iw_michaelmicfailure)
                                         */
#define IWEVASSOCREQIE  0x8C07          /* IEs used in (Re)Association Request.
                                         * The data includes id and length
                                         * fields and may contain more than one
                                         * IE. This event is required in
                                         * Managed mode if the driver
                                         * generates its own WPA/RSN IE. This
                                         * should be sent just before
                                         * IWEVREGISTERED event for the
                                         * association. */
#define IWEVASSOCRESPIE 0x8C08          /* IEs used in (Re)Association
                                         * Response. The data includes id and
                                         * length fields and may contain more
                                         * than one IE. This may be sent
                                         * between IWEVASSOCREQIE and
                                         * IWEVREGISTERED events for the
                                         * association. */
#define IWEVPMKIDCAND   0x8C09          /* PMKID candidate for RSN
                                         * pre-authentication
                                         * (struct iw_pmkid_cand) */

#define IWEVFIRST       0x8C00
#define IW_EVENT_IDX(cmd)       ((cmd) - IWEVFIRST)

/* ------------------------- PRIVATE INFO ------------------------- */
/*
 * The following is used with SIOCGIWPRIV. It allow a driver to define
 * the interface (name, type of data) for its private ioctl.
 * Privates ioctl are SIOCIWFIRSTPRIV -> SIOCIWLASTPRIV
 */

#define IW_PRIV_TYPE_MASK       0x7000  /* Type of arguments */
#define IW_PRIV_TYPE_NONE       0x0000
#define IW_PRIV_TYPE_BYTE       0x1000  /* Char as number */
#define IW_PRIV_TYPE_CHAR       0x2000  /* Char as character */
#define IW_PRIV_TYPE_INT        0x4000  /* 32 bits int */
#define IW_PRIV_TYPE_FLOAT      0x5000  /* struct iw_freq */
#define IW_PRIV_TYPE_ADDR       0x6000  /* struct sockaddr */

#define IW_PRIV_SIZE_FIXED      0x0800  /* Variable or fixed number of args */

#define IW_PRIV_SIZE_MASK       0x07FF  /* Max number of those args */

/*
 * Note : if the number of args is fixed and the size < 16 octets,
 * instead of passing a pointer we will put args in the iwreq struct...
 */

/* ----------------------- OTHER CONSTANTS ----------------------- */

/* Maximum frequencies in the range struct */
#define IW_MAX_FREQUENCIES      32
/* Note : if you have something like 80 frequencies,
 * don't increase this constant and don't fill the frequency list.
 * The user will be able to set by channel anyway... */

/* Maximum bit rates in the range struct */
#define IW_MAX_BITRATES         32

/* Maximum tx powers in the range struct */
#define IW_MAX_TXPOWER          8
/* Note : if you more than 8 TXPowers, just set the max and min or
 * a few of them in the struct iw_range. */

/* Maximum of address that you may set with SPY */
#define IW_MAX_SPY              8

/* Maximum of address that you may get in the
   list of access points in range */
#define IW_MAX_AP               64

/* Maximum size of the ESSID and NICKN strings */
#define IW_ESSID_MAX_SIZE       32

/* Modes of operation */
#define IW_MODE_AUTO    0       /* Let the driver decides */
#define IW_MODE_ADHOC   1       /* Single cell network */
#define IW_MODE_INFRA   2       /* Multi cell network, roaming, ... */
#define IW_MODE_MASTER  3       /* Synchronisation master or Access Point */
#define IW_MODE_REPEAT  4       /* Wireless Repeater (forwarder) */
#define IW_MODE_SECOND  5       /* Secondary master/repeater (backup) */
#define IW_MODE_MONITOR 6       /* Passive monitor (listen only) */
#define IW_MODE_MESH    7       /* Mesh (IEEE 802.11s) network */

/* Statistics flags (bitmask in updated) */
#define IW_QUAL_QUAL_UPDATED    0x01    /* Value was updated since last read */
#define IW_QUAL_LEVEL_UPDATED   0x02
#define IW_QUAL_NOISE_UPDATED   0x04
#define IW_QUAL_ALL_UPDATED     0x07
#define IW_QUAL_DBM             0x08    /* Level + Noise are dBm */
#define IW_QUAL_QUAL_INVALID    0x10    /* Driver doesn't provide value */
#define IW_QUAL_LEVEL_INVALID   0x20
#define IW_QUAL_NOISE_INVALID   0x40
#define IW_QUAL_RCPI            0x80    /* Level + Noise are 802.11k RCPI */
#define IW_QUAL_ALL_INVALID     0x70

/* Frequency flags */
#define IW_FREQ_AUTO            0x00    /* Let the driver decides */
#define IW_FREQ_FIXED           0x01    /* Force a specific value */

/* Maximum number of size of encoding token available
 * they are listed in the range structure */
#define IW_MAX_ENCODING_SIZES   8

/* Maximum size of the encoding token in bytes */
#define IW_ENCODING_TOKEN_MAX   64      /* 512 bits (for now) */

/* Flags for encoding (along with the token) */
#define IW_ENCODE_INDEX         0x00FF  /* Token index (if needed) */
#define IW_ENCODE_FLAGS         0xFF00  /* Flags defined below */
#define IW_ENCODE_MODE          0xF000  /* Modes defined below */
#define IW_ENCODE_DISABLED      0x8000  /* Encoding disabled */
#define IW_ENCODE_ENABLED       0x0000  /* Encoding enabled */
#define IW_ENCODE_RESTRICTED    0x4000  /* Refuse non-encoded packets */
#define IW_ENCODE_OPEN          0x2000  /* Accept non-encoded packets */
#define IW_ENCODE_NOKEY         0x0800  /* Key is write only, so not present */
#define IW_ENCODE_TEMP          0x0400  /* Temporary key */

/* Power management flags available (along with the value, if any) */
#define IW_POWER_ON             0x0000  /* No details... */
#define IW_POWER_TYPE           0xF000  /* Type of parameter */
#define IW_POWER_PERIOD         0x1000  /* Value is a period/duration of  */
#define IW_POWER_TIMEOUT        0x2000  /* Value is a timeout (to go asleep) */
#define IW_POWER_MODE           0x0F00  /* Power Management mode */
#define IW_POWER_UNICAST_R      0x0100  /* Receive only unicast messages */
#define IW_POWER_MULTICAST_R    0x0200  /* Receive only multicast messages */
#define IW_POWER_ALL_R          0x0300  /* Receive all messages though PM */
#define IW_POWER_FORCE_S        0x0400  /* Force PM procedure for sending unicast */
#define IW_POWER_REPEATER       0x0800  /* Repeat broadcast messages in PM period */
#define IW_POWER_MODIFIER       0x000F  /* Modify a parameter */
#define IW_POWER_MIN            0x0001  /* Value is a minimum  */
#define IW_POWER_MAX            0x0002  /* Value is a maximum */
#define IW_POWER_RELATIVE       0x0004  /* Value is not in seconds/ms/us */

/* Transmit Power flags available */
#define IW_TXPOW_TYPE           0x00FF  /* Type of value */
#define IW_TXPOW_DBM            0x0000  /* Value is in dBm */
#define IW_TXPOW_MWATT          0x0001  /* Value is in mW */
#define IW_TXPOW_RELATIVE       0x0002  /* Value is in arbitrary units */
#define IW_TXPOW_RANGE          0x1000  /* Range of value between min/max */

/* Retry limits and lifetime flags available */
#define IW_RETRY_ON             0x0000  /* No details... */
#define IW_RETRY_TYPE           0xF000  /* Type of parameter */
#define IW_RETRY_LIMIT          0x1000  /* Maximum number of retries*/
#define IW_RETRY_LIFETIME       0x2000  /* Maximum duration of retries in us */
#define IW_RETRY_MODIFIER       0x00FF  /* Modify a parameter */
#define IW_RETRY_MIN            0x0001  /* Value is a minimum  */
#define IW_RETRY_MAX            0x0002  /* Value is a maximum */
#define IW_RETRY_RELATIVE       0x0004  /* Value is not in seconds/ms/us */
#define IW_RETRY_SHORT          0x0010  /* Value is for short packets  */
#define IW_RETRY_LONG           0x0020  /* Value is for long packets */

/* Scanning request flags */
#define IW_SCAN_DEFAULT         0x0000  /* Default scan of the driver */
#define IW_SCAN_ALL_ESSID       0x0001  /* Scan all ESSIDs */
#define IW_SCAN_THIS_ESSID      0x0002  /* Scan only this ESSID */
#define IW_SCAN_ALL_FREQ        0x0004  /* Scan all Frequencies */
#define IW_SCAN_THIS_FREQ       0x0008  /* Scan only this Frequency */
#define IW_SCAN_ALL_MODE        0x0010  /* Scan all Modes */
#define IW_SCAN_THIS_MODE       0x0020  /* Scan only this Mode */
#define IW_SCAN_ALL_RATE        0x0040  /* Scan all Bit-Rates */
#define IW_SCAN_THIS_RATE       0x0080  /* Scan only this Bit-Rate */
/* struct iw_scan_req scan_type */
#define IW_SCAN_TYPE_ACTIVE 0
#define IW_SCAN_TYPE_PASSIVE 1
/* Maximum size of returned data */
#define IW_SCAN_MAX_DATA        4096    /* In bytes */

/* Scan capability flags - in (struct iw_range *)->scan_capa */
#define IW_SCAN_CAPA_NONE               0x00
#define IW_SCAN_CAPA_ESSID              0x01
#define IW_SCAN_CAPA_BSSID              0x02
#define IW_SCAN_CAPA_CHANNEL    0x04
#define IW_SCAN_CAPA_MODE               0x08
#define IW_SCAN_CAPA_RATE               0x10
#define IW_SCAN_CAPA_TYPE               0x20
#define IW_SCAN_CAPA_TIME               0x40

/* Max number of char in custom event - use multiple of them if needed */
#define IW_CUSTOM_MAX           256     /* In bytes */

/* Generic information element */
#define IW_GENERIC_IE_MAX       1024

/* MLME requests (SIOCSIWMLME / struct iw_mlme) */
#define IW_MLME_DEAUTH          0
#define IW_MLME_DISASSOC        1
#define IW_MLME_AUTH            2
#define IW_MLME_ASSOC           3

/* SIOCSIWAUTH/SIOCGIWAUTH struct iw_param flags */
#define IW_AUTH_INDEX           0x0FFF
#define IW_AUTH_FLAGS           0xF000
/* SIOCSIWAUTH/SIOCGIWAUTH parameters (0 .. 4095)
 * (IW_AUTH_INDEX mask in struct iw_param flags; this is the index of the
 * parameter that is being set/get to; value will be read/written to
 * struct iw_param value field) */
#define IW_AUTH_WPA_VERSION             0
#define IW_AUTH_CIPHER_PAIRWISE         1
#define IW_AUTH_CIPHER_GROUP            2
#define IW_AUTH_KEY_MGMT                3
#define IW_AUTH_TKIP_COUNTERMEASURES    4
#define IW_AUTH_DROP_UNENCRYPTED        5
#define IW_AUTH_80211_AUTH_ALG          6
#define IW_AUTH_WPA_ENABLED             7
#define IW_AUTH_RX_UNENCRYPTED_EAPOL    8
#define IW_AUTH_ROAMING_CONTROL         9
#define IW_AUTH_PRIVACY_INVOKED         10

/* IW_AUTH_WPA_VERSION values (bit field) */
#define IW_AUTH_WPA_VERSION_DISABLED    0x00000001
#define IW_AUTH_WPA_VERSION_WPA         0x00000002
#define IW_AUTH_WPA_VERSION_WPA2        0x00000004

/* IW_AUTH_PAIRWISE_CIPHER and IW_AUTH_GROUP_CIPHER values (bit field) */
#define IW_AUTH_CIPHER_NONE     0x00000001
#define IW_AUTH_CIPHER_WEP40    0x00000002
#define IW_AUTH_CIPHER_TKIP     0x00000004
#define IW_AUTH_CIPHER_CCMP     0x00000008
#define IW_AUTH_CIPHER_WEP104   0x00000010

/* IW_AUTH_KEY_MGMT values (bit field) */
#define IW_AUTH_KEY_MGMT_802_1X 1
#define IW_AUTH_KEY_MGMT_PSK    2

/* IW_AUTH_80211_AUTH_ALG values (bit field) */
#define IW_AUTH_ALG_OPEN_SYSTEM 0x00000001
#define IW_AUTH_ALG_SHARED_KEY  0x00000002
#define IW_AUTH_ALG_LEAP        0x00000004

/* IW_AUTH_ROAMING_CONTROL values */
#define IW_AUTH_ROAMING_ENABLE  0       /* driver/firmware based roaming */
#define IW_AUTH_ROAMING_DISABLE 1       /* user space program used for roaming
                                         * control */

/* SIOCSIWENCODEEXT definitions */
#define IW_ENCODE_SEQ_MAX_SIZE  8
/* struct iw_encode_ext ->alg */
#define IW_ENCODE_ALG_NONE      0
#define IW_ENCODE_ALG_WEP       1
#define IW_ENCODE_ALG_TKIP      2
#define IW_ENCODE_ALG_CCMP      3
#define IW_ENCODE_ALG_PMK       4
/* struct iw_encode_ext ->ext_flags */
#define IW_ENCODE_EXT_TX_SEQ_VALID      0x00000001
#define IW_ENCODE_EXT_RX_SEQ_VALID      0x00000002
#define IW_ENCODE_EXT_GROUP_KEY         0x00000004
#define IW_ENCODE_EXT_SET_TX_KEY        0x00000008

/* IWEVMICHAELMICFAILURE : struct iw_michaelmicfailure ->flags */
#define IW_MICFAILURE_KEY_ID    0x00000003 /* Key ID 0..3 */
#define IW_MICFAILURE_GROUP     0x00000004
#define IW_MICFAILURE_PAIRWISE  0x00000008
#define IW_MICFAILURE_STAKEY    0x00000010
#define IW_MICFAILURE_COUNT     0x00000060 /* 1 or 2 (0 = count not supported)
                                            */

/* Bit field values for enc_capa in struct iw_range */
#define IW_ENC_CAPA_WPA         0x00000001
#define IW_ENC_CAPA_WPA2        0x00000002
#define IW_ENC_CAPA_CIPHER_TKIP 0x00000004
#define IW_ENC_CAPA_CIPHER_CCMP 0x00000008
#define IW_ENC_CAPA_4WAY_HANDSHAKE      0x00000010

/* Event capability macros - in (struct iw_range *)->event_capa
 * Because we have more than 32 possible events, we use an array of
 * 32 bit bitmasks. Note : 32 bits = 0x20 = 2^5. */
#define IW_EVENT_CAPA_BASE(cmd)         ((cmd >= SIOCIWFIRSTPRIV) ? \
                                         (cmd - SIOCIWFIRSTPRIV + 0x60) : \
                                         (cmd - SIOCSIWCOMMIT))
#define IW_EVENT_CAPA_INDEX(cmd)        (IW_EVENT_CAPA_BASE(cmd) >> 5)
#define IW_EVENT_CAPA_MASK(cmd)         (1 << (IW_EVENT_CAPA_BASE(cmd) & 0x1F))
/* Event capability constants - event autogenerated by the kernel
 * This list is valid for most 802.11 devices, customise as needed... */
#define IW_EVENT_CAPA_K_0       (IW_EVENT_CAPA_MASK(0x8B04) | \
                                 IW_EVENT_CAPA_MASK(0x8B06) | \
                                 IW_EVENT_CAPA_MASK(0x8B1A))
#define IW_EVENT_CAPA_K_1       (IW_EVENT_CAPA_MASK(0x8B2A))
/* "Easy" macro to set events in iw_range (less efficient) */
#define IW_EVENT_CAPA_SET(event_capa, cmd) (event_capa[IW_EVENT_CAPA_INDEX(cmd)] |= IW_EVENT_CAPA_MASK(cmd))
#define IW_EVENT_CAPA_SET_KERNEL(event_capa) {event_capa[0] |= IW_EVENT_CAPA_K_0; event_capa[1] |= IW_EVENT_CAPA_K_1; }


/****************************** TYPES ******************************/

/* --------------------------- SUBTYPES --------------------------- */
/*
 *      Generic format for most parameters that fit in an int
 */
struct  iw_param
{
  __s32         value;          /* The value of the parameter itself */
  __u8          fixed;          /* Hardware should not use auto select */
  __u8          disabled;       /* Disable the feature */
  __u16         flags;          /* Various specifc flags (if any) */
};

/*
 *      For all data larger than 16 octets, we need to use a
 *      pointer to memory allocated in user space.
 */
struct  iw_point
{
  void __user   *pointer;       /* Pointer to the data  (in user space) */
  __u16         length;         /* number of fields or size in bytes */
  __u16         flags;          /* Optional params */
};

#ifdef __KERNEL__
#ifdef CONFIG_COMPAT

#include <linux/compat.h>

struct compat_iw_point {
        compat_caddr_t pointer;
        __u16 length;
        __u16 flags;
};
#endif
#endif

/*
 *      A frequency
 *      For numbers lower than 10^9, we encode the number in 'm' and
 *      set 'e' to 0
 *      For number greater than 10^9, we divide it by the lowest power
 *      of 10 to get 'm' lower than 10^9, with 'm'= f / (10^'e')...
 *      The power of 10 is in 'e', the result of the division is in 'm'.
 */
struct  iw_freq
{
        __s32           m;              /* Mantissa */
        __s16           e;              /* Exponent */
        __u8            i;              /* List index (when in range struct) */
        __u8            flags;          /* Flags (fixed/auto) */
};

/*
 *      Quality of the link
 */
struct  iw_quality
{
        __u8            qual;           /* link quality (%retries, SNR,
                                           %missed beacons or better...) */
        __u8            level;          /* signal level (dBm) */
        __u8            noise;          /* noise level (dBm) */
        __u8            updated;        /* Flags to know if updated */
};

/*
 *      Packet discarded in the wireless adapter due to
 *      "wireless" specific problems...
 *      Note : the list of counter and statistics in net_device_stats
 *      is already pretty exhaustive, and you should use that first.
 *      This is only additional stats...
 */
struct  iw_discarded
{
        __u32           nwid;           /* Rx : Wrong nwid/essid */
        __u32           code;           /* Rx : Unable to code/decode (WEP) */
        __u32           fragment;       /* Rx : Can't perform MAC reassembly */
        __u32           retries;        /* Tx : Max MAC retries num reached */
        __u32           misc;           /* Others cases */
};

/*
 *      Packet/Time period missed in the wireless adapter due to
 *      "wireless" specific problems...
 */
struct  iw_missed
{
        __u32           beacon;         /* Missed beacons/superframe */
};

/*
 *      Quality range (for spy threshold)
 */
struct  iw_thrspy
{
        struct sockaddr         addr;           /* Source address (hw/mac) */
        struct iw_quality       qual;           /* Quality of the link */
        struct iw_quality       low;            /* Low threshold */
        struct iw_quality       high;           /* High threshold */
};

/*
 *      Optional data for scan request
 *
 *      Note: these optional parameters are controlling parameters for the
 *      scanning behavior, these do not apply to getting scan results
 *      (SIOCGIWSCAN). Drivers are expected to keep a local BSS table and
 *      provide a merged results with all BSSes even if the previous scan
 *      request limited scanning to a subset, e.g., by specifying an SSID.
 *      Especially, scan results are required to include an entry for the
 *      current BSS if the driver is in Managed mode and associated with an AP.
 */
struct  iw_scan_req
{
        __u8            scan_type; /* IW_SCAN_TYPE_{ACTIVE,PASSIVE} */
        __u8            essid_len;
        __u8            num_channels; /* num entries in channel_list;
                                       * 0 = scan all allowed channels */
        __u8            flags; /* reserved as padding; use zero, this may
                                * be used in the future for adding flags
                                * to request different scan behavior */
        struct sockaddr bssid; /* ff:ff:ff:ff:ff:ff for broadcast BSSID or
                                * individual address of a specific BSS */

        /*
         * Use this ESSID if IW_SCAN_THIS_ESSID flag is used instead of using
         * the current ESSID. This allows scan requests for specific ESSID
         * without having to change the current ESSID and potentially breaking
         * the current association.
         */
        __u8            essid[IW_ESSID_MAX_SIZE];

        /*
         * Optional parameters for changing the default scanning behavior.
         * These are based on the MLME-SCAN.request from IEEE Std 802.11.
         * TU is 1.024 ms. If these are set to 0, driver is expected to use
         * reasonable default values. min_channel_time defines the time that
         * will be used to wait for the first reply on each channel. If no
         * replies are received, next channel will be scanned after this. If
         * replies are received, total time waited on the channel is defined by
         * max_channel_time.
         */
        __u32           min_channel_time; /* in TU */
        __u32           max_channel_time; /* in TU */

        struct iw_freq  channel_list[IW_MAX_FREQUENCIES];
};

/* ------------------------- WPA SUPPORT ------------------------- */

/*
 *      Extended data structure for get/set encoding (this is used with
 *      SIOCSIWENCODEEXT/SIOCGIWENCODEEXT. struct iw_point and IW_ENCODE_*
 *      flags are used in the same way as with SIOCSIWENCODE/SIOCGIWENCODE and
 *      only the data contents changes (key data -> this structure, including
 *      key data).
 *
 *      If the new key is the first group key, it will be set as the default
 *      TX key. Otherwise, default TX key index is only changed if
 *      IW_ENCODE_EXT_SET_TX_KEY flag is set.
 *
 *      Key will be changed with SIOCSIWENCODEEXT in all cases except for
 *      special "change TX key index" operation which is indicated by setting
 *      key_len = 0 and ext_flags |= IW_ENCODE_EXT_SET_TX_KEY.
 *
 *      tx_seq/rx_seq are only used when respective
 *      IW_ENCODE_EXT_{TX,RX}_SEQ_VALID flag is set in ext_flags. Normal
 *      TKIP/CCMP operation is to set RX seq with SIOCSIWENCODEEXT and start
 *      TX seq from zero whenever key is changed. SIOCGIWENCODEEXT is normally
 *      used only by an Authenticator (AP or an IBSS station) to get the
 *      current TX sequence number. Using TX_SEQ_VALID for SIOCSIWENCODEEXT and
 *      RX_SEQ_VALID for SIOCGIWENCODEEXT are optional, but can be useful for
 *      debugging/testing.
 */
struct  iw_encode_ext
{
        __u32           ext_flags; /* IW_ENCODE_EXT_* */
        __u8            tx_seq[IW_ENCODE_SEQ_MAX_SIZE]; /* LSB first */
        __u8            rx_seq[IW_ENCODE_SEQ_MAX_SIZE]; /* LSB first */
        struct sockaddr addr; /* ff:ff:ff:ff:ff:ff for broadcast/multicast
                               * (group) keys or unicast address for
                               * individual keys */
        __u16           alg; /* IW_ENCODE_ALG_* */
        __u16           key_len;
        __u8            key[0];
};

/* SIOCSIWMLME data */
struct  iw_mlme
{
        __u16           cmd; /* IW_MLME_* */
        __u16           reason_code;
        struct sockaddr addr;
};

/* SIOCSIWPMKSA data */
#define IW_PMKSA_ADD            1
#define IW_PMKSA_REMOVE         2
#define IW_PMKSA_FLUSH          3

#define IW_PMKID_LEN    16

struct  iw_pmksa
{
        __u32           cmd; /* IW_PMKSA_* */
        struct sockaddr bssid;
        __u8            pmkid[IW_PMKID_LEN];
};

/* IWEVMICHAELMICFAILURE data */
struct  iw_michaelmicfailure
{
        __u32           flags;
        struct sockaddr src_addr;
        __u8            tsc[IW_ENCODE_SEQ_MAX_SIZE]; /* LSB first */
};

/* IWEVPMKIDCAND data */
#define IW_PMKID_CAND_PREAUTH   0x00000001 /* RNS pre-authentication enabled */
struct  iw_pmkid_cand
{
        __u32           flags; /* IW_PMKID_CAND_* */
        __u32           index; /* the smaller the index, the higher the
                                * priority */
        struct sockaddr bssid;
};

/* ------------------------ WIRELESS STATS ------------------------ */
/*
 * Wireless statistics (used for /proc/net/wireless)
 */
struct  iw_statistics
{
        __u16           status;         /* Status
                                         * - device dependent for now */

        struct iw_quality       qual;           /* Quality of the link
                                                 * (instant/mean/max) */
        struct iw_discarded     discard;        /* Packet discarded counts */
        struct iw_missed        miss;           /* Packet missed counts */
};

/* ------------------------ IOCTL REQUEST ------------------------ */
/*
 * This structure defines the payload of an ioctl, and is used 
 * below.
 *
 * Note that this structure should fit on the memory footprint
 * of iwreq (which is the same as ifreq), which mean a max size of
 * 16 octets = 128 bits. Warning, pointers might be 64 bits wide...
 * You should check this when increasing the structures defined
 * above in this file...
 */
union   iwreq_data
{
        /* Config - generic */
        char            name[IFNAMSIZ];
        /* Name : used to verify the presence of  wireless extensions.
         * Name of the protocol/provider... */

        struct iw_point essid;          /* Extended network name */
        struct iw_param nwid;           /* network id (or domain - the cell) */
        struct iw_freq  freq;           /* frequency or channel :
                                         * 0-1000 = channel
                                         * > 1000 = frequency in Hz */

        struct iw_param sens;           /* signal level threshold */
        struct iw_param bitrate;        /* default bit rate */
        struct iw_param txpower;        /* default transmit power */
        struct iw_param rts;            /* RTS threshold threshold */
        struct iw_param frag;           /* Fragmentation threshold */
        __u32           mode;           /* Operation mode */
        struct iw_param retry;          /* Retry limits & lifetime */

        struct iw_point encoding;       /* Encoding stuff : tokens */
        struct iw_param power;          /* PM duration/timeout */
        struct iw_quality qual;         /* Quality part of statistics */

        struct sockaddr ap_addr;        /* Access point address */
        struct sockaddr addr;           /* Destination address (hw/mac) */

        struct iw_param param;          /* Other small parameters */
        struct iw_point data;           /* Other large parameters */
};

/*
 * The structure to exchange data for ioctl.
 * This structure is the same as 'struct ifreq', but (re)defined for
 * convenience...
 * Do I need to remind you about structure size (32 octets) ?
 */
struct  iwreq 
{
        union
        {
                char    ifrn_name[IFNAMSIZ];    /* if name, e.g. "eth0" */
        } ifr_ifrn;

        /* Data part (defined just above) */
        union   iwreq_data      u;
};

/* -------------------------- IOCTL DATA -------------------------- */
/*
 *      For those ioctl which want to exchange mode data that what could
 *      fit in the above structure...
 */

/*
 *      Range of parameters
 */

struct  iw_range
{
        /* Informative stuff (to choose between different interface) */
        __u32           throughput;     /* To give an idea... */
        /* In theory this value should be the maximum benchmarked
         * TCP/IP throughput, because with most of these devices the
         * bit rate is meaningless (overhead an co) to estimate how
         * fast the connection will go and pick the fastest one.
         * I suggest people to play with Netperf or any benchmark...
         */

        /* NWID (or domain id) */
        __u32           min_nwid;       /* Minimal NWID we are able to set */
        __u32           max_nwid;       /* Maximal NWID we are able to set */

        /* Old Frequency (backward compat - moved lower ) */
        __u16           old_num_channels;
        __u8            old_num_frequency;

        /* Scan capabilities */
        __u8            scan_capa;      /* IW_SCAN_CAPA_* bit field */

        /* Wireless event capability bitmasks */
        __u32           event_capa[6];

        /* signal level threshold range */
        __s32           sensitivity;

        /* Quality of link & SNR stuff */
        /* Quality range (link, level, noise)
         * If the quality is absolute, it will be in the range [0 ; max_qual],
         * if the quality is dBm, it will be in the range [max_qual ; 0].
         * Don't forget that we use 8 bit arithmetics... */
        struct iw_quality       max_qual;       /* Quality of the link */
        /* This should contain the average/typical values of the quality
         * indicator. This should be the threshold between a "good" and
         * a "bad" link (example : monitor going from green to orange).
         * Currently, user space apps like quality monitors don't have any
         * way to calibrate the measurement. With this, they can split
         * the range between 0 and max_qual in different quality level
         * (using a geometric subdivision centered on the average).
         * I expect that people doing the user space apps will feedback
         * us on which value we need to put in each driver... */
        struct iw_quality       avg_qual;       /* Quality of the link */

        /* Rates */
        __u8            num_bitrates;   /* Number of entries in the list */
        __s32           bitrate[IW_MAX_BITRATES];       /* list, in bps */

        /* RTS threshold */
        __s32           min_rts;        /* Minimal RTS threshold */
        __s32           max_rts;        /* Maximal RTS threshold */

        /* Frag threshold */
        __s32           min_frag;       /* Minimal frag threshold */
        __s32           max_frag;       /* Maximal frag threshold */

        /* Power Management duration & timeout */
        __s32           min_pmp;        /* Minimal PM period */
        __s32           max_pmp;        /* Maximal PM period */
        __s32           min_pmt;        /* Minimal PM timeout */
        __s32           max_pmt;        /* Maximal PM timeout */
        __u16           pmp_flags;      /* How to decode max/min PM period */
        __u16           pmt_flags;      /* How to decode max/min PM timeout */
        __u16           pm_capa;        /* What PM options are supported */

        /* Encoder stuff */
        __u16   encoding_size[IW_MAX_ENCODING_SIZES];   /* Different token sizes */
        __u8    num_encoding_sizes;     /* Number of entry in the list */
        __u8    max_encoding_tokens;    /* Max number of tokens */
        /* For drivers that need a "login/passwd" form */
        __u8    encoding_login_index;   /* token index for login token */

        /* Transmit power */
        __u16           txpower_capa;   /* What options are supported */
        __u8            num_txpower;    /* Number of entries in the list */
        __s32           txpower[IW_MAX_TXPOWER];        /* list, in bps */

        /* Wireless Extension version info */
        __u8            we_version_compiled;    /* Must be WIRELESS_EXT */
        __u8            we_version_source;      /* Last update of source */

        /* Retry limits and lifetime */
        __u16           retry_capa;     /* What retry options are supported */
        __u16           retry_flags;    /* How to decode max/min retry limit */
        __u16           r_time_flags;   /* How to decode max/min retry life */
        __s32           min_retry;      /* Minimal number of retries */
        __s32           max_retry;      /* Maximal number of retries */
        __s32           min_r_time;     /* Minimal retry lifetime */
        __s32           max_r_time;     /* Maximal retry lifetime */

        /* Frequency */
        __u16           num_channels;   /* Number of channels [0; num - 1] */
        __u8            num_frequency;  /* Number of entry in the list */
        struct iw_freq  freq[IW_MAX_FREQUENCIES];       /* list */
        /* Note : this frequency list doesn't need to fit channel numbers,
         * because each entry contain its channel index */

        __u32           enc_capa;       /* IW_ENC_CAPA_* bit field */
};

/*
 * Private ioctl interface information
 */
 
struct  iw_priv_args
{
        __u32           cmd;            /* Number of the ioctl to issue */
        __u16           set_args;       /* Type and number of args */
        __u16           get_args;       /* Type and number of args */
        char            name[IFNAMSIZ]; /* Name of the extension */
};

/* ----------------------- WIRELESS EVENTS ----------------------- */
/*
 * Wireless events are carried through the rtnetlink socket to user
 * space. They are encapsulated in the IFLA_WIRELESS field of
 * a RTM_NEWLINK message.
 */

/*
 * A Wireless Event. Contains basically the same data as the ioctl...
 */
struct iw_event
{
        __u16           len;                    /* Real length of this stuff */
        __u16           cmd;                    /* Wireless IOCTL */
        union iwreq_data        u;              /* IOCTL fixed payload */
};

/* Size of the Event prefix (including padding and alignement junk) */
#define IW_EV_LCP_LEN   (sizeof(struct iw_event) - sizeof(union iwreq_data))
/* Size of the various events */
#define IW_EV_CHAR_LEN  (IW_EV_LCP_LEN + IFNAMSIZ)
#define IW_EV_UINT_LEN  (IW_EV_LCP_LEN + sizeof(__u32))
#define IW_EV_FREQ_LEN  (IW_EV_LCP_LEN + sizeof(struct iw_freq))
#define IW_EV_PARAM_LEN (IW_EV_LCP_LEN + sizeof(struct iw_param))
#define IW_EV_ADDR_LEN  (IW_EV_LCP_LEN + sizeof(struct sockaddr))
#define IW_EV_QUAL_LEN  (IW_EV_LCP_LEN + sizeof(struct iw_quality))

/* iw_point events are special. First, the payload (extra data) come at
 * the end of the event, so they are bigger than IW_EV_POINT_LEN. Second,
 * we omit the pointer, so start at an offset. */
#define IW_EV_POINT_OFF (((char *) &(((struct iw_point *) NULL)->length)) - \
                          (char *) NULL)
#define IW_EV_POINT_LEN (IW_EV_LCP_LEN + sizeof(struct iw_point) - \
                         IW_EV_POINT_OFF)

#ifdef __KERNEL__
#ifdef CONFIG_COMPAT
struct __compat_iw_event {
        __u16           len;                    /* Real length of this stuff */
        __u16           cmd;                    /* Wireless IOCTL */
        compat_caddr_t  pointer;
};
#define IW_EV_COMPAT_LCP_LEN offsetof(struct __compat_iw_event, pointer)
#define IW_EV_COMPAT_POINT_OFF offsetof(struct compat_iw_point, length)
#define IW_EV_COMPAT_POINT_LEN  \
        (IW_EV_COMPAT_LCP_LEN + sizeof(struct compat_iw_point) - \
         IW_EV_COMPAT_POINT_OFF)
#endif
#endif

/* Size of the Event prefix when packed in stream */
#define IW_EV_LCP_PK_LEN        (4)
/* Size of the various events when packed in stream */
#define IW_EV_CHAR_PK_LEN       (IW_EV_LCP_PK_LEN + IFNAMSIZ)
#define IW_EV_UINT_PK_LEN       (IW_EV_LCP_PK_LEN + sizeof(__u32))
#define IW_EV_FREQ_PK_LEN       (IW_EV_LCP_PK_LEN + sizeof(struct iw_freq))
#define IW_EV_PARAM_PK_LEN      (IW_EV_LCP_PK_LEN + sizeof(struct iw_param))
#define IW_EV_ADDR_PK_LEN       (IW_EV_LCP_PK_LEN + sizeof(struct sockaddr))
#define IW_EV_QUAL_PK_LEN       (IW_EV_LCP_PK_LEN + sizeof(struct iw_quality))
#define IW_EV_POINT_PK_LEN      (IW_EV_LCP_LEN + 4)

#endif  /* _LINUX_WIRELESS_H */