Copyright (c) 2007 Marcus Glocker <mglocker@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.Dd $Mdocdate: November 10 2019 $ .Dt BWI 4 .Os .Sh NAME .Nm bwi .Nd Broadcom AirForce IEEE 802.11b/g wireless network device .Sh SYNOPSIS .Cd "bwi* at cardbus?" .Cd "bwi* at pci?" .Sh DESCRIPTION The .Nm driver provides support for Broadcom AirForce based PCI/Cardbus network adapters.
p These are the modes the .Nm driver can operate in: l -tag -width "IBSS-masterXX" t 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. t 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
p The .Nm driver can be configured to use Wired Equivalent Privacy (WEP) or Wi-Fi Protected Access (WPA1 and WPA2). WPA2 is the current encryption standard for wireless networks. It is strongly recommended that neither WEP nor WPA1 are used as the sole mechanism to secure wireless communication, due to serious weaknesses. WPA1 is disabled by default and may be enabled using the option .Qq Cm wpaprotos Ar wpa1,wpa2 . For standard WPA networks which use pre-shared keys (PSK), keys are configured using the .Qq Cm wpakey option. WPA-Enterprise networks require use of the wpa_supplicant package. The .Nm driver relies on the software 802.11 stack for both encryption and decryption of data frames.
p The transmit speed is user-selectable or can be adapted automatically by the driver depending on the received signal strength and on the number of hardware transmission retries.
p 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 firmware file which is loaded when an interface is brought up:
p
l -tag -width Ds -offset indent -compact t Pa /etc/firmware/bwi-airforce .El
.Pp
These firmware files are not free because Broadcom refuses
to grant distribution rights.
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.
p A prepackaged version of the firmware can be installed using .Xr fw_update 1 . .Sh HARDWARE The following cards are among those supported by the .Nm driver: l -column "TRENDnet TEW-401PCplus" "BCM4306" "CardBus" "Standard" -offset 6n t Em Card Ta Em Chip Ta Em Bus Ta Em Standard t "Apple Airport Extreme" Ta BCM4306 Ta PCI Ta b/g t "Apple Airport Extreme" Ta BCM4318 Ta PCI Ta b/g t "ASUS WL-138g" Ta BCM4318 Ta PCI Ta b/g t "Buffalo WLI-CB-G54" Ta BCM4306 Ta CardBus Ta b/g t "Compaq R4035 onboard" Ta BCM4306 Ta PCI Ta b/g t "HP nx6125" Ta BCM4319 Ta PCI Ta b/g t "Linksys WPC54G Ver 3" Ta BCM4318 Ta CardBus Ta b/g t "Linksys WPC54GS Ver 2" Ta BCM4318 Ta CardBus Ta b/g t "TRENDnet TEW-401PCplus" Ta BCM4306 Ta CardBus Ta b/g t "US Robotics 5411" Ta BCM4318 Ta CardBus Ta b/g .El .Sh EXAMPLES The following example scans for available networks:
p .Dl # ifconfig bwi0 scan
p
The following
.Xr hostname.if 5
example configures bwi0 to join network
.Dq mynwid ,
using WPA key
.Dq mywpakey ,
obtaining an IP address using DHCP:
d -literal -offset indent nwid mynwid wpakey mywpakey
dhcp
.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 4.3 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written for
.Dx
by
.An Sepherosa Ziehau
and ported to
.Ox
by
.An Jonathan Gray
and
.An Marcus Glocker .
.Sh CAVEATS
Some chips are incorrectly calibrated due to the lack of documentation,
which can slow the amount of traffic to the point of being unusable.
Furthermore this driver only supports firmware version 3.
p The BCM4331 chip isn't supported by this driver but the driver disables the chip if detected, since some buggy EFI revisions found in 2011-2012 Macs leave the chip enabled, causing it to emit spurious interrupts when the shared interrupt line is enabled.
p This driver does not support powersave mode.