1.\" 2.\" Copyright (c) 2003 Tom Rhodes 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd December 7, 2004 29.Dt WLAN 4 30.Os 31.Sh NAME 32.Nm wlan 33.Nd generic 802.11 link-layer support 34.Sh SYNOPSIS 35.Cd "device wlan" 36.Sh DESCRIPTION 37The 38.Nm 39module provides generic code to support 802.11 drivers. 40Where a device does not directly support 802.11 functionality 41this layer fills in. 42The 43.Nm 44is required for the 45.Xr wi 4 , 46.Xr an 4 47and 48.Xr ath 4 49drivers, with other drivers to follow. 50.Pp 51The 52.Nm 53module supports multi-mode devices capable of 54operating in both 2.4GHz and 5GHz bands and supports numerous 55802.11 protocols: 802.11a, 802.11b, and 802.11g. 56The WPA, 802.11i, and 802.1x security protocols are supported 57through a combination of in-kernel code and user-mode applications. 58The WME and WMM multi-media protocols are supported entirely within 59the 60.Nm 61module but require a suitably capable hardware device. 62.Pp 63The 64.Nm 65module defines several mechanisms by which plugin modules may 66be used to extend functionality. 67Cryptographic support such as WEP, TKIP, and AES-CCMP are implemented 68as modules that are loaded on demand (if not statically configured 69into a system). 70Similarly there is an authenticator framework for defining 802.11 71authentication services and a framework for integrating access 72control mechanisms specific to the 802.11 protocol. 73.Sh DEBUGGING 74If the associated interface is marked for debugging with, for example, 75.Pp 76.Dl "ifconfig wi0 debug" 77.Pp 78then messages describing the operation of the 802.11 protocol will 79be sent to the console. 80Complete debugging controls are available using: 81.Pp 82.Dl "sysctl net.wlan.X.debug=mask" 83.Pp 84where 85.Ar X 86is the number of the 87.Nm 88instance and mask is a bit-or of control bits that determine which 89debugging messages to enable. 90For example, 91.Pp 92.Dl "sysctl net.wlan.0.debug=0x00200000" 93.Pp 94enables debugging messages related to scanning for an access point, 95adhoc neighbor, or an unoccupied channel when operation as an access point. 96The 97.Xr 80211debug 98tool provides a more user-friendly mechanism for doing the same thing. 99.Pp 100Many drivers will also display the contents of each 802.11 frame 101sent and received when the interface is marked with 102both debugging and 103.Cm link2 ; 104e.g., 105.Pp 106.Dl "ifconfig wi0 debug link2" 107.Pp 108Beware however that some management frames may be processed entirely within 109the device and not be received by the host. 110.Sh COMPATIBILITY 111The module name of 112.Nm 113was used to be compatible with 114.Nx . 115.Sh SEE ALSO 116.Xr an 4 , 117.Xr ath 4 , 118.Xr awi 4 , 119.Xr netintro 4 , 120.Xr wi 4 , 121.Xr wlan_acl 4 , 122.Xr wlan_ccmp 4 , 123.Xr wlan_tkip 4 , 124.Xr wlan_wep 4 , 125.Xr wlan_xauth 4 126.Sh STANDARDS 127More information can be found in the IEEE 802.11 Standard. 128.Sh HISTORY 129The 130.Nm 131driver first appeared in 132.Fx 5.0 . 133.Sh AUTHORS 134Atsushi Onoe is the author of original 135.Nx 136software from which this work began. 137.An -nosplit 138.An Sam Leffler 139brought the code into 140.Fx 141and then rewrote it to support multi-mode devices, 142802.11g, WPA/802.11i, WME, and add the extensible frameworks 143for cryptographic, authentication, and access control plugins. 144This manual page was written by 145.An Tom Rhodes Aq trhodes@FreeBSD.org . 146