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Use ifconfig(8)'s "join" command by default

Its adoption went quite well, so install "join" rather than the old "nwid"
in new hostname.if(5) files and follow this trend in our wifi manuals.

OK deraadt sthen

.\" $OpenBSD: rtwn.4,v 1.12 2021/10/24 12:32:42 kn Exp $
.\"
.\" Copyright (c) 2010 Damien Bergamini <damien.bergamini@free.fr>
.\" Copyright (c) 2015 Stefan Sperling <stsp@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
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: October 24 2021 $
.Dt RTWN 4
.Os
.Sh NAME
.Nm rtwn
.Nd Realtek RTL8188CE/RTL8188EE/RTL8192CE/RTL8723AE PCIe IEEE 802.11b/g/n
wireless network device
.Sh SYNOPSIS
.Cd "rtwn* at pci? port ?"
.Sh DESCRIPTION
The
.Nm
driver supports PCIe wireless network devices based on the Realtek
RTL8188CE, RTL8188EE, RTL8192CE and RTL8723AE chipsets.
.Pp
The RTL8188CE, RTL8188EE and RTL8723AE are highly integrated 802.11n adapters
that combine a MAC, a 1T1R capable baseband and an RF in a single chip.
The RTL8723AE also includes a Bluetooth 2.1/3.0/4.0 controller.
.Pp
The RTL8192CE is a highly integrated multiple-in, multiple-out (MIMO)
802.11n adapter that combines a MAC, a 2T2R capable baseband and an
RF in a single chip.
.Pp
These devices operate in the 2GHz spectrum only.
.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 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
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.
.Pp
The
.Nm
driver can be configured at runtime with
.Xr ifconfig 8
or on boot with
.Xr hostname.if 5 .
.Sh FILES
The adapter needs firmware files to run, which are loaded on demand by
the driver when the device is attached:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It Pa /etc/firmware/rtwn-rtl8188e
.It Pa /etc/firmware/rtwn-rtl8192cU
.It Pa /etc/firmware/rtwn-rtl8192cU_B
.It Pa /etc/firmware/rtwn-rtl8723
.It Pa /etc/firmware/rtwn-rtl8723_B
.El
.Sh EXAMPLES
The following example scans for available networks:
.Pp
.Dl # ifconfig rtwn0 scan
.Pp
The following
.Xr hostname.if 5
example configures rtwn0 to join network
.Dq mynwid ,
using WPA key
.Dq mywpakey ,
obtaining an IP address using DHCP:
.Bd -literal -offset indent
join mynwid wpakey mywpakey
inet autoconf
.Ed
.Sh DIAGNOSTICS
.Bl -diag
.It "rtwn0: could not read firmware ..."
For some reason, the driver was unable to read the microcode file from the
filesystem.
The file might be missing or corrupted.
.It "rtwn0: device timeout"
A frame dispatched to the hardware for transmission did not complete in time.
The driver will reset the hardware.
This should not happen.
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr intro 4 ,
.Xr netintro 4 ,
.Xr pci 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 5.8 .
.Sh AUTHORS
The
.Nm
driver was written by
.An -nosplit
.An Stefan Sperling Aq Mt stsp@openbsd.org .
It was based on the
.Xr urtwn 4
driver written by
.An Damien Bergamini Aq Mt damien.bergamini@free.fr .
.Sh CAVEATS
The
.Nm
driver does not support any of the 802.11n capabilities offered by the
adapters.
Additional work is required in
.Xr ieee80211 9
before those features can be supported.
.Pp
This driver does not support powersave mode.