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248 lines
7.6 KiB
Groff
248 lines
7.6 KiB
Groff
.\" Copyright (c) 2001
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.\" The Aerospace Corporation. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 23, 2001
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.Dt IEEE80211 4
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.Os
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.Sh NAME
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.Nm ieee80211
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.Nd standard interface to IEEE 802.11 devices
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In net/if.h
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.In net/ethernet.h
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.In net/if_ieee80211.h
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.Sh DESCRIPTION
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This section describes the standard interface to configuration
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and status information on IEEE 802.11 devices.
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Most devices support options not configurable by this interface.
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They must be set by their respective, specific control program.
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The interface is via one
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of the following
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.Xr ioctl 2
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calls on a socket:
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.Bl -tag -width ".Dv SIOCG80211"
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.It Dv SIOCG80211
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Get configuration or status information.
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.It Dv SIOCS80211
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Set configuration information.
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.El
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.Pp
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These requests are made via a modified
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.Vt ifreq
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structure.
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This structure is defined as follows:
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.Bd -literal
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struct ieee80211req {
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char i_name[IFNAMSIZ]; /* if_name, e.g. "wi0" */
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u_int16_t i_type; /* req type */
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int16_t i_val; /* Index or simple value */
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int16_t i_len; /* Index or simple value */
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void *i_data; /* Extra data */
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};
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.Ed
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.Pp
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For
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.Dv SIOCG80211
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the following values of
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.Va i_type
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are valid:
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.Bl -tag -width indent
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.It Dv IEEE80211_IOC_SSID
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Returns the requested SSID by copying it into the buffer pointed to by
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.Va i_data
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and setting
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.Va i_len
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to the length.
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If
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.Va i_val
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is \(>= 0 then the request refers to the configured value for that slot.
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Generally, 0 is the only valid value, but some interfaces support more
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SSIDs.
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If
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.Va i_val
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is \-1 then the request refers to the currently active value.
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.It Dv IEEE80211_IOC_NUMSSIDS
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Returns the number of SSIDs this card supports.
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In most cases, this is
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1, but some devices such as
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.Xr an 4
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support more.
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.It Dv IEEE80211_IOC_WEP
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Returns the current WEP status in
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.Va i_val .
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Valid values are
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.Dv IEEE80211_WEP_NOSUP , IEEE80211_WEP_ON , IEEE80211_WEP_OFF ,
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and
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.Dv IEEE80211_WEP_MIXED .
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Respectively, these values mean unsupported, mandatory for all devices,
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off, and on, but not required for all devices.
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.It Dv IEEE80211_IOC_WEPKEY
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Returns the requested WEP key via
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.Va i_data
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and its length via
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.Va i_len .
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If the device does not support returning the WEP key or the user is not
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root then the key may be returned as all zeros.
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Technically this is a
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valid key, but it is the kind of key an idiot would put on his luggage so
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we use it as a special value.
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Generally, only four WEP keys are allowed, but some devices support more.
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If so, the first four (0-3) are
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the standard keys stored in volatile storage and the others are device
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specific.
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.It Dv IEEE80211_IOC_NUMWEPKEYS
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Returns the number of WEP keys supported by this device, generally 4.
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A device that does not support WEP may either report 0 or simply return
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.Er EINVAL .
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.It Dv IEEE80211_IOC_WEPTXKEY
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Returns the WEP key used for transmission.
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.It Dv IEEE80211_IOC_AUTHMODE
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Returns the current authentication mode in
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.Va i_val .
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Valid values are
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.Dv IEEE80211_AUTH_NONE , IEEE80211_AUTH_OPEN ,
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and
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.Dv IEEE80211_AUTH_SHARED .
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.It Dv IEEE80211_IOC_STATIONNAME
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Returns the station name via
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.Va i_data
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and its length via
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.Va i_len .
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While all known devices seem to support this in some way or another,
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they all do it differently and it appears to not have anything to do
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with the actual IEEE 802.11 standard so making up an answer may be
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necessary for future devices.
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.It Dv IEEE80211_IOC_CHANNEL
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Returns the current direct sequence spread spectrum channel in use.
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.It Dv IEEE80211_IOC_POWERSAVE
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Returns the current powersaving mode.
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Valid values are
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.Dv IEEE80211_POWERSAVE_NOSUP , IEEE80211_POWERSAVE_OFF ,
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.Dv IEEE80211_POWERSAVE_ON , IEEE80211_POWERSAVE_CAM ,
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.Dv IEEE80211_POWERSAVE_PSP ,
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and
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.Dv IEEE80211_POWERSAVE_PSP_CAM .
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Currently,
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.Dv IEEE80211_POWERSAVE_ON
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is defined to be equal to
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.Dv IEEE80211_POWERSAVE_CAM ,
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but this may be incorrect.
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.It Dv IEEE80211_IOC_POWERSAVESLEEP
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Returns the powersave sleep time in msec in
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.Va i_val .
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.El
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.Pp
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For
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.Dv SIOCS80211
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the following values of
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.Va i_type
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are valid:
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.Bl -tag -width indent
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.It Dv IEEE80211_IOC_SSID
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Set the desired SSID for infrastructure and ad-hoc modes to value given
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by
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.Va i_data
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and
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.Va i_len .
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The length should be no longer than 32 characters.
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.It Dv IEEE80211_IOC_WEP
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Set the current WEP mode to the value given in
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.Va i_val .
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Valid values are the same as those for this value above.
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Devices which
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do not support all modes may choose to either return
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.Er EINVAL
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or choose a reasonable alternate (supported) setting.
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.It Dv IEEE80211_IOC_WEPKEY
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Set the WEP key indicated by
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.Va i_val
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to the value given by
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.Va i_data
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and
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.Va i_len .
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Generally, valid values of
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.Va i_len
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are 0, 5, and 13 though not all devices with WEP support have support
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for 13-byte keys.
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.It Dv IEEE80211_IOC_WEPTXKEY
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Set the WEP key used for transmission to the value in
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.Va i_val .
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Not all values which are valid for setting keys may be valid for setting
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transmit keys due to strange device interfaces.
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.It Dv IEEE80211_IOC_AUTHMODE
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Set the current authorization mode to the value given in
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.Va i_val .
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Valid values are given above.
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Not all devices support this.
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.It Dv IEEE80211_IOC_STATIONNAME
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Set the station name to the value given by
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.Va i_data
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and
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.Va i_len .
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The standard does not appear to deal with this feature so the range of
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valid values may vary from device to device.
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.It Dv IEEE80211_IOC_CHANNEL
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Set the desired ad-hoc channel to the value given by
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.Va i_val .
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On some devices this has an impact on infrastructure mode as well.
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Valid values are 1-14, but 0 should be allowed and should return the
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device to the default value.
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May devices support this directly by
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converting any invalid value to the default value.
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.It Dv IEEE80211_IOC_POWERSAVE
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Set the current powersaving mode to the value given in
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.Va i_val .
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Valid values are the same as those for this value above.
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Devices which
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do not support all modes may choose to either return
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.Er EINVAL
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or choose a reasonable alternate (supported) setting.
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Most devices only
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support CAM mode.
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.It Dv IEEE80211_IOC_POWERSAVESLEEP
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Set the powersave sleep time in msec to the value in
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.Va i_val .
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.El
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr an 4 ,
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.Xr ray 4 ,
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.Xr wi 4 ,
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.Xr ancontrol 8 ,
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.Xr ifconfig 8 ,
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.Xr raycontrol 8 ,
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.Xr wicontrol 8
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.Sh HISTORY
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The
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.Nm
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manual appeared in
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.Fx 4.3 .
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