.\"	$OpenBSD: pgt.4,v 1.36 2011/09/03 22:59:08 jmc Exp $
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.\" Copyright (c) 2006 Theo de Raadt.
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.Dd $Mdocdate: September 3 2011 $
.Dt PGT 4
.Os
.Sh NAME
.Nm pgt
.Nd Conexant/Intersil Prism GT Full-MAC IEEE 802.11a/b/g wireless network
device
.Sh SYNOPSIS
.Cd "pgt* at cardbus?"
.Cd "pgt* at pci?"
.Sh DESCRIPTION
The
.Nm
driver provides support for Conexant/Intersil GT-series devices
which can support the Full-Mac firmwares, using the ISL3877,
ISL3880, and ISL3890 chips.
The
.Nm
driver will not (yet) work on similar devices using the ISL3886 or
similar chips which use the Soft-Mac firmwares.
.Pp
These are the modes the
.Nm
driver can operate in:
.Bl -tag -width "IBSS-masterXX"
.It BSS mode
Also known as
.Em infrastructure
mode, this is used when associating with an access point, through
which all traffic passes.
This mode is the default.
.It IBSS mode
Also known as
.Em IEEE ad-hoc
mode or
.Em peer-to-peer
mode.
This is the standardized method of operating without an access point.
Stations associate with a service set.
However, actual connections between stations are peer-to-peer.
.It Host AP
In this mode the driver acts as an access point (base station)
for other cards.
.It monitor mode
In this mode the driver is able to receive packets without
associating with an access point.
This disables the internal receive filter and enables the card to
capture packets from networks which it wouldn't normally have access to,
or to scan for access points.
.El
.Pp
The
.Nm
driver can be configured to use hardware
Wired Equivalent Privacy (WEP).
It is strongly recommended that WEP
not be used as the sole mechanism
to secure wireless communication,
due to serious weaknesses in it.
.Pp
The
.Nm
driver can be configured at runtime with
.Xr ifconfig 8
or on boot with
.Xr hostname.if 5 .
.Sh FILES
The driver needs a set of firmware files which are loaded when
an interface is brought up:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Pa /etc/firmware/pgt-isl3877
.It Pa /etc/firmware/pgt-isl3890
.El
.Pp
These firmware files are not free because Conexant refuses
to grant distribution rights.
In fact they have rebuffed thousands
of attempts to start a dialogue on this issue.
As a result, even though
.Ox
includes the driver, the firmware files cannot be included and
users have to download these files on their own.
.Pp
A prepackaged version of the firmware, designed to be used with
.Xr pkg_add 1 ,
can be found at:
.Bd -literal -offset 3n
http://firmware.openbsd.org/firmware/pgt-firmware-1.2.tgz
.Ed
.Sh HARDWARE
The following cards are among those supported by the
.Nm
driver:
.Bl -column "NETGEAR WG511 (Taiwanese, not Chinese)" "ISL3880" "CardBus" -offset 6n
.It Em Card Ta Em Chip Ta Em Bus
.It "3COM 3CRWE154G72" Ta ISL3880 Ta CardBus
.It "D-Link DWL-g650 A1" Ta ISL3890 Ta PCI
.It "I-O Data WN-G54/CB" Ta ISL3890 Ta PCI
.It "I4 Z-Com XG-600" Ta ISL3890 Ta PCI
.It "I4 Z-Com XG-900" Ta ISL3890 Ta PCI
.It "Intersil PRISM Indigo" Ta ISL3877 Ta PCI
.It "Intersil PRISM Duette" Ta ISL3890 Ta PCI
.It "NETGEAR WG511 (Taiwanese, not Chinese)" Ta ISL3890 Ta CardBus
.It "PLANEX GW-DS54G" Ta ISL3890 Ta PCI
.It "SMC EZ Connect g 2.4GHz SMC2802W" Ta ISL3890 Ta PCI
.It "SMC EZ Connect g 2.4GHz SMC2835W-v2" Ta ISL3890 Ta CardBus
.It "SMC 2802Wv2" Ta ISL3890 Ta PCI
.It "Soyo Aerielink" Ta ISL3890 Ta CardBus
.It "ZyXEL ZyAIR G-100" Ta ISL3890 Ta CardBus
.El
.Sh EXAMPLES
The following
.Xr hostname.if 5
example configures pgt0 to join whatever network is available on boot,
using WEP key
.Dq 0x1deadbeef1 ,
channel 11, obtaining an IP address using DHCP:
.Bd -literal -offset indent
dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11
.Ed
.Pp
The following
.Xr hostname.if 5
example creates a host-based access point on boot:
.Bd -literal -offset indent
inet 192.168.1.1 255.255.255.0 NONE media autoselect \e
	mediaopt hostap nwid my_net chan 11
.Ed
.Pp
Configure pgt0 for WEP, using hex key
.Dq 0x1deadbeef1 :
.Bd -literal -offset indent
# ifconfig pgt0 nwkey 0x1deadbeef1
.Ed
.Pp
Return pgt0 to its default settings:
.Bd -literal -offset indent
# ifconfig pgt0 -bssid -chan media autoselect \e
	nwid "" -nwkey
.Ed
.Pp
Join an existing BSS network,
.Dq my_net :
.Bd -literal -offset indent
# ifconfig pgt0 192.168.1.1 netmask 0xffffff00 nwid my_net
.Ed
.Sh SEE ALSO
.Xr arp 4 ,
.Xr cardbus 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pci 4 ,
.Xr hostname.if 5 ,
.Xr hostapd 8 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 4.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was originally written for
.Fx
by
.An Brian Fundakowski ,
and then rewritten for
.Ox
by
.An Marcus Glocker
and
.An Claudio Jeker .
.Sh CAVEATS
Host AP mode doesn't support power saving.
Clients attempting to use power saving mode may experience significant
packet loss (disabling power saving on the client will fix this).