WPI(4)                    OpenBSD Programmer's Manual                   WPI(4)

NAME
     wpi - Intel PRO/Wireless 3945ABG IEEE 802.11a/b/g wireless network device

SYNOPSIS
     wpi* at pci?

DESCRIPTION
     The wpi driver provides support for Intel PRO/Wireless 3945ABG Mini PCI
     Express network adapters.

     These are the modes the wpi driver can operate in:

     BSS mode       Also known as infrastructure mode, this is used when asso-
                    ciating with an access point, through which all traffic
                    passes.  This mode is the default.

     monitor mode   In this mode the driver is able to receive packets without
                    associating with an access point.  This disables the in-
                    ternal receive filter and enables the card to capture
                    packets from networks which it wouldn't normally have ac-
                    cess to, or to scan for access points.

     The wpi driver can be configured to use Wired Equivalent Privacy (WEP) or
     Wi-Fi Protected Access (WPA-PSK and WPA2-PSK).  WPA is the de facto en-
     cryption standard for wireless networks.  It is strongly recommended that
     WEP not be used as the sole mechanism to secure wireless communication,
     due to serious weaknesses in it.  The wpi driver offloads both encryption
     and decryption of unicast data frames to the hardware for the CCMP ci-
     pher.

     The wpi driver can be configured at runtime with ifconfig(8) or on boot
     with hostname.if(5).

FILES
     The driver needs at least version 3.1 of the following firmware file,
     which is loaded when an interface is brought up:

           /etc/firmware/wpi-3945abg

     This firmware file is not free because Intel refuses to grant distribu-
     tion rights without contractual obligations.  As a result, even though
     OpenBSD includes the driver, the firmware file cannot be included and
     users have to download this file on their own.

     A prepackaged version of the firmware, designed to be used with
     pkg_add(1), can be found at:

     http://damien.bergamini.free.fr/packages/openbsd/wpi-firmware-3.2.tgz

EXAMPLES
     The following hostname.if(5) example configures wpi0 to join whatever
     network is available on boot, using WEP key ``0x1deadbeef1'', channel 11,
     obtaining an IP address using DHCP:

           dhcp NONE NONE NONE nwkey 0x1deadbeef1 chan 11

     Configure wpi0 to join network ``my_net'' using WPA-PSK with passphrase
     ``my_passphrase'':

           # ifconfig wpi0 nwid my_net wpa wpapsk \
                   `wpa-psk my_net my_passphrase`

     Return wpi0 to its default settings:

           # ifconfig wpi0 -bssid -chan media autoselect \
                   nwid "" -nwkey -wpa -wpapsk

     Join an existing BSS network, ``my_net'':

           # ifconfig wpi0 192.168.1.1 netmask 0xffffff00 nwid my_net

DIAGNOSTICS
     wpi%d: device timeout  A frame dispatched to the hardware for transmis-
     sion did not complete in time.  The driver will reset the hardware.  This
     should not happen.

     wpi%d: fatal firmware error  For some reason, the firmware crashed.  The
     driver will reset the hardware.  This should not happen.

     wpi%d: Radio transmitter is off  The radio transmitter is off and thus no
     packet can go out.  The driver will reset the hardware.  Make sure the
     laptop radio switch is on.

     wpi%d: error %d, could not read firmware %s  For some reason, the driver
     was unable to read the firmware image from the filesystem.  The file
     might be missing or corrupted.

     wpi%d: firmware file too short: %d bytes  The firmware image is corrupted
     and can't be loaded into the adapter.

     wpi%d: could not load firmware  An attempt to load the firmware into the
     adapter failed.  The driver will reset the hardware.

SEE ALSO
     pkg_add(1), arp(4), ifmedia(4), intro(4), netintro(4), pci(4),
     hostname.if(5), ifconfig(8), wpa-psk(8)

AUTHORS
     The wpi driver was written by Damien Bergamini <damien@openbsd.org>.

OpenBSD 4.7                    November 17, 2009                             2
