159 lines
4.5 KiB
Groff
159 lines
4.5 KiB
Groff
.\"
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.\" Copyright (c) 2003 Tom Rhodes
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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 September 6, 2007
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.Dt WLAN 4
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.Os
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.Sh NAME
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.Nm wlan
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.Nd generic 802.11 link-layer support
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.Sh SYNOPSIS
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.Cd "device wlan"
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.Sh DESCRIPTION
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The
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.Nm
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module provides generic code to support 802.11 drivers.
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Where a device does not directly support 802.11 functionality
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this layer fills in.
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The
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.Nm
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is required for the
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.Xr an 4 ,
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.Xr ath 4 ,
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.Xr awi 4 ,
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.Xr ipw 4 ,
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.Xr iwi 4 ,
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.Xr ral 4 ,
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.Xr rum 4 ,
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.Xr ural 4 ,
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.Xr wi 4 ,
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and
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.Xr zyd 4
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drivers, with other drivers to follow.
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.Pp
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The
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.Nm
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module supports multi-mode devices capable of
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operating in both 2.4GHz and 5GHz bands and supports numerous
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802.11 protocols: 802.11a, 802.11b, and 802.11g.
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The WPA, 802.11i, and 802.1x security protocols are supported
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through a combination of in-kernel code and user-mode applications.
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The WME and WMM multi-media protocols are supported entirely within
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the
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.Nm
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module but require a suitably capable hardware device.
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.Pp
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The
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.Nm
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module defines several mechanisms by which plugin modules may
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be used to extend functionality.
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Cryptographic support such as WEP, TKIP, and AES-CCMP are implemented
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as modules that are loaded on demand (if not statically configured
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into a system).
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Similarly there is an authenticator framework for defining 802.11
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authentication services and a framework for integrating access
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control mechanisms specific to the 802.11 protocol.
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.Sh DEBUGGING
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If the associated interface is marked for debugging with, for example,
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.Pp
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.Dl "ifconfig wi0 debug"
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.Pp
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then messages describing the operation of the 802.11 protocol will
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be sent to the console.
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Complete debugging controls are available using:
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.Pp
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.Dl "sysctl net.wlan.X.debug=mask"
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.Pp
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where
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.Ar X
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is the number of the
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.Nm
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instance and mask is a bit-or of control bits that determine which
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debugging messages to enable.
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For example,
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.Pp
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.Dl "sysctl net.wlan.0.debug=0x00200000"
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.Pp
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enables debugging messages related to scanning for an access point,
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adhoc neighbor, or an unoccupied channel when operation as an access point.
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The
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.Xr 80211debug
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tool provides a more user-friendly mechanism for doing the same thing.
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.Pp
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Many drivers will also display the contents of each 802.11 frame
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sent and received when the interface is marked with
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both debugging and
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.Cm link2 ;
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e.g.,
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.Pp
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.Dl "ifconfig wi0 debug link2"
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.Pp
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Beware however that some management frames may be processed entirely within
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the device and not be received by the host.
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.Sh COMPATIBILITY
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The module name of
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.Nm
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was used to be compatible with
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.Nx .
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.Sh SEE ALSO
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.Xr an 4 ,
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.Xr ath 4 ,
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.Xr awi 4 ,
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.Xr ipw 4 ,
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.Xr iwi 4 ,
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.Xr netintro 4 ,
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.Xr ral 4 ,
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.Xr rum 4 ,
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.Xr ural 4 ,
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.Xr wi 4 ,
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.Xr wlan_acl 4 ,
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.Xr wlan_ccmp 4 ,
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.Xr wlan_tkip 4 ,
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.Xr wlan_wep 4 ,
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.Xr wlan_xauth 4 ,
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.Xr zyd 4
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.Sh STANDARDS
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More information can be found in the IEEE 802.11 Standard.
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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Atsushi Onoe is the author of original
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.Nx
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software from which this work began.
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.An -nosplit
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.An Sam Leffler
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brought the code into
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.Fx
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and then rewrote it to support multi-mode devices,
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802.11g, WPA/802.11i, WME, and add the extensible frameworks
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for cryptographic, authentication, and access control plugins.
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This manual page was written by
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.An Tom Rhodes Aq trhodes@FreeBSD.org .
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