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26 .\" $FreeBSD: src/share/man/man4/wlan.4,v 1.8.2.1 2005/12/02 16:45:03 brueffer Exp $
27 .\" $DragonFly: src/share/man/man4/wlan.4,v 1.7 2008/03/22 09:51:46 sephe Exp $
34 .Nd generic 802.11 link-layer support
40 module provides generic code to support 802.11 drivers.
41 Where a device does not directly support 802.11 functionality
57 drivers, with other drivers to follow.
61 module supports multi-mode devices capable of
62 operating in both 2.4GHz and 5GHz bands and supports numerous
63 802.11 protocols: 802.11a, 802.11b, and 802.11g.
64 The WPA, 802.11i, and 802.1x security protocols are supported
65 through a combination of in-kernel code and user-mode applications.
66 The WME and WMM multi-media protocols are supported entirely within
69 module but require a suitably capable hardware device.
73 module defines several mechanisms by which plugin modules may
74 be used to extend functionality.
75 Cryptographic support such as WEP, TKIP, and AES-CCMP are implemented
76 as modules that are loaded on demand (if not statically configured
78 Similarly there is an authenticator framework for defining 802.11
79 authentication services and a framework for integrating access
80 control mechanisms specific to the 802.11 protocol.
82 If the associated interface is marked for debugging with, for example,
84 .Dl "ifconfig wi0 debug"
86 then messages describing the operation of the 802.11 protocol will
87 be sent to the console.
88 Complete debugging controls are available using:
90 .Dl "sysctl net.wlan.X.debug=mask"
96 instance and mask is a bit-or of control bits that determine which
97 debugging messages to enable.
100 .Dl "sysctl net.wlan.0.debug=0x00200000"
102 enables debugging messages related to scanning for an access point,
103 adhoc neighbor, or an unoccupied channel when operation as an access point.
106 .\"tool provides a more user-friendly mechanism for doing the same thing.
108 Many drivers will also display the contents of each 802.11 frame
109 sent and received when the interface is marked with
114 .Dl "ifconfig wi0 debug link2"
116 Beware however that some management frames may be processed entirely within
117 the device and not be received by the host.
121 was used to be compatible with
143 More information can be found in the IEEE 802.11 Standard.
147 driver first appeared in
150 Atsushi Onoe is the author of original
152 software from which this work began.
155 brought the code into
157 and then rewrote it to support multi-mode devices,
158 802.11g, WPA/802.11i, WME, and add the extensible frameworks
159 for cryptographic, authentication, and access control plugins.
160 This manual page was written by
161 .An Tom Rhodes Aq trhodes@FreeBSD.org .