BCM5354

[Robert Hazbun]

Where can I find the "spec" and the "todo-list" for what may / may not
be implemented.

--RH

On 6/7/2010 12:42 PM, Larry Finger wrote:
> On 06/07/2010 01:56 PM, Robert Hazbun wrote:
>   
>> Interesting. So, this give me hope that I've done something wrong. When
>> I try to enable AP mode using iwconfig, I simply get an error.
>>
>> Larry, the company I work for is willing to fund b43 work on the BCM5354
>> and have it released to the public. Do you know who has done the initial
>> work on the 5354, and who would be the right person to contact?
>>     
> As Michael Buesch says, there may be parts of the 5354 spec that have
> not yet been implemented in b43. I am the person that did most of the LP
> PHY reverse engineering. The person that did the coding from the
> resulting "specs" was Gabor Stefanik, who reads this list. I will review
> the 5354-specific code in the latest driver to see if changes are needed.
>
> I suspect that the problem is with iwconfig, which uses the WEXT
> interface that is only partially implemented.  I wrote the following for
> the openSUSE Wireless Forum. It will not wok directly with openWRT, but
> it should give you the idea.
>
> =================================================
>
> This article might be entitled "How to convert an $800 laptop into a $40
> wireless router", which indicates why doing this might not be desirable.
> There are, however, at least two cases where this might make sense: (1)
> You want to provide or test some feature that is not supplied by your
> AP. One example is 802.11a (5 GHz) channels. (2) your need for an AP is
> temporary such as network sharing of a 3G broadband modem.
>
> To accomplish the task, several pieces of software will be needed
> including hostapd, a DHCP server for the AP's clients, and an iptables
> rules for Network Address Translation (NAT). The requirements for these
> are discussed in turn.
>
> I. Hostapd
>
> Hostapd runs in user space and interacts with the device driver to
> handle most of the things that an AP does, such as transmitting of
> beacons, authentication, etc. The version included with the "hostapd"
> package of openSUSE 11.1 (0.5.10) works with a limited number of devices
> and drivers. For modern drivers that use mac80211, a newer version is
> needed, which can be downloaded from hostapd: IEEE 802.11 AP, IEEE
> 802.1X/WPA/WPA2/EAP/RADIUS Authenticator. Building this will require
> that the make, libnl, libnl-devel, openssl-devel and gcc packages are
> installed. I recommend installing the package from the repository and
> then doing a download, make and install of the later version. If your
> kernel is older than 2.6.28 (check uname -r), then you will need the
> compat-wireless code that is downloaded from Download - Linux Wireless.
> For this option, you will also need to install the kernel source, and
> prepare it for use.
> To prepare the source, issue the following commands:
> Code:
>
> cd /usr/src/linux
> sudo cp /proc/config.gz .
> sudo gunzip config.gz
> sudo cp config .config
> sudo make prepare
>
> Configuration of hostapd is accomplished with a configuration file named
> hostapd.conf. There are a number of options in that file, but a working
> AP with WPA2 encryption can be setup with the following:
>
> Code:
>
> interface=wlan0
> driver=nl80211
> hw_mode=g
> channel=1
> ssid=test
> wpa=2
> wpa_key_mgmt=WPA-PSK
> wpa_pairwise=CCMP
> wpa_passphrase=123456789
>
> II. Dhcpd
>
> The standard dhcpd package in openSUSE 11.1 works just fine. To use it,
> you need to modify its configuration file dhcpd.conf. Again, there are a
> number of options available, but you can get a working DHCP server with
> the following:
>
> Code:
>
> option domain-name-servers 192.168.1.1;
> default-lease-time 600;
> max-lease-time 7200;
> ddns-update-style none; ddns-updates off;
> subnet 192.168.0.0 netmask 255.255.255.0 {
>         range 192.168.0.200 192.168.0.229;
>         option subnet-mask 255.255.255.0;
>         option broadcast-address 192.168.0.255;
>         option routers 192.168.0.1;
> }
>
> The above configuration assumes that the AP will be connected to the
> outside world with an IP address of 192.168.1.X and that the AP's
> clients will have addresses 192.168.0.X. If other addresses are used,
> adjust the above info accordingly.
>
> III. Iptables Network Address Translation rules
>
> For this example, the NAT rules will be only those necessary to get the
> AP operational. Although iptables is used to write firewalls, the only
> protection in this code is to allow only established connections. The
> rules are shown in the script below.
>
> IV. A script to start and stop the Access Point
>
> The following code will start and stop the AP. To make any changes
> easier, the locations of the various utilities, the interface names, and
> the IP address to be used are defined by symbols at the start of the
> script. I also use configuration files that are stored in root's home
> directory, not in /etc as would normally be done. This script must be
> executable and be run as root.
>
> Code:
>
> #!/bin/sh
> # Script to start/stop a hostapd-based access point
> #
> # Symbols for needed programs
>
> IPTABLES=/usr/sbin/iptables
> IFCONFIG=/sbin/ifconfig
> DHCPD=/usr/sbin/dhcpd
> HOSTAPD=/usr/local/bin/hostapd
>
> # Symbols for internal and external interfaces
>
> NET_INT=wlan0
> NET_EXT=eth0
>
> # IP address for the AP
>
> INT_ADDR=192.168.0.1
>
> case "$1" in
> start)
>         echo "Starting AP mode for $NET_INT at address $INT_ADDR"
>         # Disable packet forwarding
>         echo 0 > /proc/sys/net/ipv4/ip_forward
>         # Stop any existing hostapd and dhcpd daemons
>         killproc hostapd
>         killproc dhcpd
>         #Set up forwarding
>         $IPTABLES -t nat -A POSTROUTING -o $NET_EXT -j MASQUERADE
>         $IPTABLES -A FORWARD -i $NET_EXT -o $NET_INT -m state \
> 		--state RELATED,ESTABLISHED -j ACCEPT
>         $IPTABLES -A FORWARD -i $NET_INT -o $NET_EXT -j ACCEPT
>         # Enable packet forwarding
>         echo 1 > /proc/sys/net/ipv4/ip_forward
>         # Get the internal interface in the right state
>         $IFCONFIG $NET_INT down
>         $IFCONFIG $NET_INT up
>         $IFCONFIG $NET_INT $INT_ADDR
>         # dhcpd needs to have a leases file available - create it if needed
>         if [ ! -f /var/lib/dhcp/db/dhcpd.leases ]; then
>                 touch /var/lib/dhcp/db/dhcpd.leases
>         fi
>         # Bring up the DHCP server
>         $DHCPD -cf /root/dhcpd.conf $NET_INT
>         # Bring up hostapd
>         $HOSTAPD -B /root/hostapd.conf
>         ;;
> stop)
>         echo "Stopping AP mode on $NET_INT"
>         # Stop hostapd and dhcpd daemons
>         killproc hostapd
>         killproc dhcpd
>         ;;
> *)
>         echo "Usage: $0 {start|stop}"
>         exit 1
>         ;;
> esac
>
> =================================================
>
> Larry
>