mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-20 15:26:43 +01:00
144 lines
5.1 KiB
Groff
144 lines
5.1 KiB
Groff
.\"
|
|
.\" Copyright (c) 2009 Sam Leffler, Errno Consulting
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 4, 2009
|
|
.Dt IEEE80211_REGDOMAIN 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ieee80211_regdomain
|
|
.Nd 802.11 regulatory support
|
|
.Sh SYNOPSIS
|
|
.In net80211/ieee80211_var.h
|
|
.In net80211/ieee80211_regdomain.h
|
|
.Pp
|
|
.Ft int
|
|
.Fo ieee80211_init_channels
|
|
.Fa "struct ieee80211com *"
|
|
.Fa "const struct ieee80211_regdomain *"
|
|
.Fa "const uint8_t bands[]"
|
|
.Fc
|
|
.\"
|
|
.Ft void
|
|
.Fo ieee80211_sort_channels
|
|
.Fa "struct ieee80211_channel *"
|
|
.Fa "int nchans"
|
|
.Fc
|
|
.\"
|
|
.Ft "struct ieee80211_appie *"
|
|
.Fn ieee80211_alloc_countryie "struct ieee80211com *"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm net80211
|
|
software layer provides a support framework for drivers that includes
|
|
comprehensive regulatory support.
|
|
.Nm net80211
|
|
provides mechanisms that enforce
|
|
.Em "regulatory policy"
|
|
by privileged user applications.
|
|
.Pp
|
|
Drivers define a device's capabilities and can
|
|
intercept and control regulatory changes requested through
|
|
.Nm net80211 .
|
|
The initial regulatory state, including the channel list, must be
|
|
filled in by the driver before calling
|
|
.Fn ieee80211_ifattach .
|
|
The channel list should reflect the set of channels the device is
|
|
.Em calibrated
|
|
for use on.
|
|
This list may also be requested later through the
|
|
.Vt ic_getradiocaps
|
|
method in the
|
|
.Vt ieee80211com
|
|
structure.
|
|
The
|
|
.Fn ieee80211_init_channels
|
|
function is provided as a rudimentary fallback for drivers that do not
|
|
(or cannot) fill in a proper channel list.
|
|
Default regulatory state is supplied such as the regulatory SKU,
|
|
ISO country code, location (e.g. indoor, outdoor), and a set of
|
|
frequency bands the device is capable of operating on.
|
|
.Nm net80211
|
|
populates the channel table in
|
|
.Vt ic_channels
|
|
with a default set of channels and capabilities.
|
|
Note this mechanism should be used with care as any mismatch between
|
|
the channel list created and the device's capabilities can result
|
|
in runtime errors (e.g. a request to operate on a channel the device
|
|
does not support).
|
|
The SKU and country information are used for generating 802.11h protocol
|
|
elements and related operation such as for 802.11d; mis-setup by a
|
|
driver is not fatal, only potentially confusing.
|
|
.Pp
|
|
Devices that do not have a fixed/default regulatory state can set
|
|
the regulatory SKU to
|
|
.Dv SKU_DEBUG
|
|
and country code to
|
|
.Dv CTRY_DEFAULT
|
|
and leave proper setup to user applications.
|
|
If default settings are known they can be installed and/or an event
|
|
can be dispatched to user space using
|
|
.Fn ieee80211_notify_country
|
|
so that
|
|
.Xr devd 8
|
|
will do the appropriate setup work at system boot (or device insertion).
|
|
.Pp
|
|
The channel table is sorted to optimize lookups using the
|
|
.Fn ieee80211_sort_channels
|
|
routine.
|
|
This should be done whenever the channel table contents are modified.
|
|
.Pp
|
|
The
|
|
.Fn ieee80211_alloc_countryie
|
|
function allocates an information element as specified by 802.11h.
|
|
Because this is expensive to generate it is cached in
|
|
.Vt ic_countryie
|
|
and generated only when regulatory state changes.
|
|
Drivers that call
|
|
.Fn ieee80211_alloc_countryie
|
|
directly should not help with this caching; doing so may confuse the
|
|
.Nm net80211
|
|
layer.
|
|
.Sh DRIVER REGULATORY CONTROL
|
|
Drivers can control regulatory change requests by overriding the
|
|
.Vt ic_setregdomain
|
|
method that checks change requests.
|
|
While drivers can reject any request that does not meet its requirements
|
|
it is recommended that one be lenient in what is accepted and, whenever
|
|
possible, instead of rejecting a request, alter it to be correct.
|
|
For example, if the transmit power cap for a channel is too high the
|
|
driver can either reject the request or (better) reduce the cap to be
|
|
compliant.
|
|
Requests that include unacceptable channels should cause the request
|
|
to be rejected as otherwise a mismatch may be created between application
|
|
state and the state managed by
|
|
.Nm net80211 .
|
|
The exact rules by which to operate are still being codified.
|
|
.Sh SEE ALSO
|
|
.Xr regdomain 5 ,
|
|
.Xr ifconfig 8 ,
|
|
.Xr ieee80211 9
|