mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
3f3f4cdba2
Of particular interest here is the ieee80211_radiotap(9) man page. TODO: Flesh out ieee80211_node.9, ieee80211_proto.9. Submitted by: bms (with help from Darron Broad)
247 lines
6.5 KiB
Groff
247 lines
6.5 KiB
Groff
.\"
|
|
.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>
|
|
.\" Copyright (c) 2004 Darron Broad <darron@kewl.org>
|
|
.\" 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\" $Id: ieee80211.9,v 1.5 2004/03/04 12:33:27 bruce Exp $
|
|
.\"
|
|
.Dd March 2, 2004
|
|
.Dt ieee80211 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ieee80211
|
|
.Nd core 802.11 network stack functions
|
|
.Sh SYNOPSIS
|
|
.In net80211/ieee80211_var.h
|
|
.In net80211/ieee80211_proto.h
|
|
.Ft void
|
|
.Fn ieee80211_ifattach "struct ifnet *ifp"
|
|
.Ft void
|
|
.Fn ieee80211_ifdetach "struct ifnet *ifp"
|
|
.Ft u_int
|
|
.Fn ieee80211_mhz2ieee "u_int freq" "u_int flags"
|
|
.Ft u_int
|
|
.Fn ieee80211_chan2ieee "struct ieee80211com *ic" "struct ieee80211_channel *c"
|
|
.Ft u_int
|
|
.Fn ieee80211_ieee2mhz "u_int chan" "u_int flags"
|
|
.Fa int
|
|
.Fn ieee80211_media_change "struct ifnet *ifp"
|
|
.Fa void
|
|
.Fn ieee80211_media_status "struct ifnet *ifp" "struct ifmediareq *imr"
|
|
.Ft void
|
|
.Fn ieee80211_watchdog "struct ifnet *ifp"
|
|
.Ft int
|
|
.Fn ieee80211_setmode "struct ieee80211com *ic" "enum ieee80211_phymode mode"
|
|
.Ft enum ieee80211_phymode
|
|
.Fn ieee80211_chan2mode "struct ieee80211com *ic" "struct ieee80211_channel *chan"
|
|
.Ft int
|
|
.Fn ieee80211_rate2media "struct ieee80211com *ic" "int rate" "enum ieee80211_phymode mode"
|
|
.Ft int
|
|
.Fn ieee80211_media2rate "int mword"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
collection of functions are used to manage wireless network interfaces in the
|
|
system which use the system's software 802.11 network stack.
|
|
Most of these functions require that attachment to the stack is performed
|
|
before calling.
|
|
Several utility functions are also provided; these are safe to call from
|
|
any driver without prior initialization.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_ifattach
|
|
function attaches the network interface
|
|
.Fa ifp
|
|
to the 802.11 network stack layer.
|
|
This function must be called before using any of the
|
|
.Nm
|
|
functions which need to store driver state across invocations;
|
|
The
|
|
.Vt struct ifnet
|
|
instance pointed to by
|
|
.Fa ifp
|
|
MUST be an instance of
|
|
.Vt struct ieee80211com ,
|
|
with various fields initialized to tell
|
|
.Nm
|
|
about its capabilities.
|
|
This function performs Ethernet and BPF attachment (by calling
|
|
.Fn ether_ifattach
|
|
and
|
|
.Fn bpfattach2 )
|
|
on behalf of the caller.
|
|
It also implements the
|
|
.Vt ifmedia
|
|
interface.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_ifdetach
|
|
function frees any
|
|
.Nm
|
|
structures associated with the driver, and performs Ethernet and BPF
|
|
detachment on behalf of the caller.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_mhz2ieee
|
|
utility function converts the frequency
|
|
.Fa freq
|
|
(specified in MHz) to an IEEE 802.11 channel number.
|
|
The
|
|
.Fa flags
|
|
argument is a hint which specifies whether the frequency is in
|
|
the 2GHz ISM band (
|
|
.Vt IEEE80211_CHAN_2GHZ )
|
|
or the 5GHz band (
|
|
.Vt IEEE80211_CHAN_5GHZ ) ;
|
|
appropriate clipping of the result is then performed.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_chan2ieee
|
|
function converts the channel specified in
|
|
.Fa *c
|
|
to an IEEE channel number for the driver
|
|
.Fa ic .
|
|
If the conversion would be invalid, an error message is printed to the
|
|
system console.
|
|
This function REQUIRES that the driver is hooked up to the
|
|
.Nm
|
|
subsystem.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_ieee2mhz
|
|
utility function converts the IEEE channel number
|
|
.Ft chan
|
|
to a frequency (in MHz).
|
|
The
|
|
.Fa flags
|
|
argument is a hint which specifies whether the frequency is in
|
|
the 2GHz ISM band (
|
|
.Vt IEEE80211_CHAN_2GHZ )
|
|
or the 5GHz band (
|
|
.Vt IEEE80211_CHAN_5GHZ ) ;
|
|
appropriate clipping of the result is then performed.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_media_init
|
|
function initializes media data structures used by the
|
|
.Vt ifmedia
|
|
interface, for the driver
|
|
.Fa ifp .
|
|
It must be called by the driver after calling
|
|
.Fn ieee80211_attach
|
|
and before calling most
|
|
.Nm
|
|
functions.
|
|
The
|
|
.Fa media_change
|
|
and
|
|
.Fa media_stat
|
|
arguments specify helper functions which will be invoked by the
|
|
.Vt ifmedia
|
|
framework when the user changes or queries media options,
|
|
using a command such as
|
|
.Xr ifconfig 8 .
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_media_status
|
|
and
|
|
.Fn ieee80211_media_change
|
|
functions are device-independent handlers for
|
|
.Vt ifmedia
|
|
commands and are not intended to be called directly.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_watchdog
|
|
function is intended to be called from a driver's
|
|
.Vt if_watchdog
|
|
routine.
|
|
It is used to perform periodic cleanup of state within the software 802.11
|
|
stack, as well as timing out scans.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_setmode
|
|
function is called from within the 802.11 stack to change the mode
|
|
of the driver's PHY; it is not intended to be called directly.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_chan2mode
|
|
function returns the PHY mode required for use with the channel
|
|
.Fa chan
|
|
on the device
|
|
.Fa ic .
|
|
This is typically used when selecting a rate set, to be advertised in
|
|
beacons, for example.
|
|
.Pp
|
|
.\"
|
|
The
|
|
.Fn ieee80211_rate2media
|
|
function converts the bit rate
|
|
.Fa rate (
|
|
measured in units of 0.5Mbps) to an
|
|
.Vt ifmedia
|
|
sub-type, for the device
|
|
.Fa ic
|
|
running in PHY mode
|
|
.Fa mode .
|
|
The
|
|
.Fn ieee80211_media2rate
|
|
performs the reverse of this conversion, returning the bit rate (in 0.5Mbps
|
|
units) corresponding to an
|
|
.Vt ifmedia
|
|
sub-type.
|
|
.Pp
|
|
.\"
|
|
.Sh SEE ALSO
|
|
.Xr ifnet 9
|
|
.Xr ieee80211_crypto 9 ,
|
|
.Xr ieee80211_input 9 ,
|
|
.Xr ieee80211_ioctl 9 ,
|
|
.Xr ieee80211_node 9 ,
|
|
.Xr ieee80211_output 9 ,
|
|
.Xr ieee80211_proto 9 ,
|
|
.Xr ieee80211_radiotap 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
series of functions first appeared in
|
|
.Nx 1.5 ,
|
|
and were later ported to
|
|
.Fx 4.6 .
|
|
.Sh AUTHORS
|
|
This man page was written by
|
|
.An Bruce M. Simpson Aq bms@FreeBSD.org
|
|
and
|
|
.An Darron Broad Aq darron@kewl.org .
|