rc.wlan

Linux Wireless LAN Project 的目标是开发一个完整的

#! /bin/sh
# Wireless network setup for ISA cards
#  (this file can safely be re-executed for restarts)

# History:
#   1999-jun        Created 
#   1999-jul-4	    Optimized for restarts
#   1999-nov-5      MSM-Modified for 0.3.4

# Due to the odd way WLAN cards need to be setup, we're executing this 
# not until the whole system has been setup. So, typically, this
# rc.wlan script can be executed via rc.local
#
# One of the issues here is the way that the driver allocates its device
# name.  Some drivers can be explicitly told what device name to use, 
# linux-wlan doesn't currently support that.  So to make sure your existing
# eth?? devices use the names they did before installing the wlan card,
# you need to make sure you don't load the am930_isa module before your
# ethernet modules.  On a redhat system, the ethernet modules are loaded
# (for run level 3) by /etc/rc.d/rc3.d/S10network.  This script can be run
# any time after that.

#
# You can still use a redhat network setup, but use ONBOOT=no
# You can then use 'ifup eth1' and 'ifdown eth1' at will while the
# system is running. In that case you can leave out the IP code
# below, and leave the IP setup to the redhat scripts 
# (see /etc/sysconfig/network-scripts).


is_true ()
{
    [ "$1" = "y" -o "$1" = "Y" -o "$1" = "yes" -o "$1" = "YES" ]
}


########################################################################
#		kernel version, probably you should not tamper with this
#		with the possible exception of simply using M=am930_isa 
V=`uname -r`
M=/lib/modules/$V/net/am930_isa.o 

########################################################################
#	MAC Setup Variables
	# Scan for which SSID?
	SCAN_SSID=""
#	DESIRED_SSID="WORK_BSS"
	DESIRED_SSID="HOME_BSS"

	# Scan for which BSS and type?
	SCAN=yes				# yes|no
	SCAN_BSSID="ff:ff:ff:ff:ff:ff"
	SCAN_BSSTYPE=both		# both|ind|infr
	SCAN_TYPE=active		# active|passive
	
	# Define scan range
	SCAN_STARTCH=1
	SCAN_ENDCH=11
	SCAN_TIMEPERCHANNEL=100

	# Create a BSS if one not detected?
	CREATEBSS=no
	CREATE_SSID=BreakInPlease	# Pick your own SSID and channel!!!
	CREATE_CHANNEL=1
	CREATE_BCN_INT=100

	# Are we only sniffing? (don't auth and assoc)
	SNIFONLY=n

	# Frame conversion type
	P80211_CONVERSION=rfc1042	# encapsulation|rfc1042|802.1h

	# Wep stuff  (currently unsupported, Don't turn it on!)
	PRIVACY=no
	WEP_EXCLUDE=noexclude_unencrypted
	WEP_DEFKEY=0
	WEP_KEY1="f1:10:ec:e0:dc"
	WEP_KEY2="0f:f2:04:09:fb"
	WEP_KEY3="13:37:f2:f9:2d"
	WEP_KEY4="e9:17:19:63:c7"

########################################################################
#	WLAN PnP setup (needs to be consistent w/ your /etc/isapnp.conf)
IRQ=9
IOBASE=0x240

########################################################################
# 	Network stack setup, comment out IP= if you don't want to do 
#	this here but through your linux distribution's setup scripts
DEVICE=eth1		

IP=192.168.2.31
NM=255.255.255.0

# next two can be derived from the above two, be careful how you do that
BC=192.168.2.255
NW=192.168.2.0


########################################################################
#  Insert the AM930 module:
#  remember, for ISA don't use rmmod, it may hang your kernel.
#  this is a bug in the driver that needs to be cleared
#  however, we can safely down the interface,  wlanctl and up it again
#
#	only insert the module if it had not been inserted before
#	never rmmod this module, it is buggy to remove and safe to leave in
cnt=`lsmod | grep -c ^am930`
if [ "$cnt" != "0" ]; then
  echo Module $M had already been loaded, no need to rmmod/insmod
else
  insmod $M am930_irq=$IRQ am930_iobase=$IOBASE
fi

if is_true "$SCAN"; then
	# Scan for existing networks
	echo "wlan scanning channels $STARTCH to $ENDCH"
	netlist=`wlanctl $DEVICE scan \
		$SCAN_STARTCH $SCAN_ENDCH $SCAN_TIMEPERCHANNEL \
		$SCAN_BSSID $SCAN_BSSTYPE $SCAN_TYPE "$SCAN_SSID"`
	echo "Detected BSSs:"
	echo "ch  bssid              bcn   cap_info  ssid"
	echo "------------------------------------------------------"
	echo "$netlist"
fi

# Set your wep keys, if present
# MSM: setting them works, but there's no cypher so strange things
#      might happen. See README.wep.
if is_true $PRIVACY ; then
	wlanctl $DEVICE privacy \
		$EXCLUDE \
		$WEP_DEFKEY \
		$WEP_KEY1 \
		$WEP_KEY2 \
		$WEP_KEY3 \
		$WEP_KEY4
fi

# Set the ethernet conversion
wlanctl $DEVICE ethconv $P80211_CONVERSION

# If our $SCAN_SSID matches one found in the scan, join it.  
#  else, check to see if we're allowed to create one.
if (echo "$netlist" | grep -q "$DESIRED_SSID") ; then
	join_bssinfo=`(echo "$netlist" | grep "$DESIRED_SSID")`
	join_ssid=$DESIRED_SSID
	join_bssid=`(echo "$join_bssinfo" | cut -c5-21)`
	join_channel=`(echo "$join_bssinfo" | cut -c1-2)`
	join_capinfo=`(echo "$join_bssinfo" | cut -c30-35)`

	wlanctl $DEVICE bssjoin $join_bssid

	echo "wlan joined BSS, channel=$join_channel"\
	     "bssid=$join_bssid ssid=\"$DESIRED_SSID\""

	# Now see if we need to auth and assoc w/ an infra bss
	if is_true $SNIFONLY; then
		echo "wlan skipping auth and assoc for sniffer"
	else
		ISIBSS=$[$join_capinfo & 0x02]
		if [ $ISIBSS -eq 0 ]; then
			wlanctl $DEVICE authen
			wlanctl $DEVICE assoc
		fi
	fi
else
	# If we're allowed, create a bss
	if is_true $CREATEBSS ; then
		wlanctl $DEVICE bsscreate \
			$CREATE_CHANNEL $CREATE_BCN_INT 0 \
			"$CREATE_SSID"

		echo "wlan created BSS with" \
			"channel=$CREATE_CHANNEL and" \
			"ssid=$CREATE_SSID"

		$DESIRED_SSID=$CREATE_SSID
	else
		echo "wlan failed to find ssid=$DESIRED_SSID"
		exit 1
	fi
fi

########################################################################

if [ "$IP" = "" ]; then
  echo $DEVICE not activated, relying on your own methods to do this
  exit 0
fi

# start up the network	(you can leave this out if your Linux
#			 implementation does that work for you)
#			e.g. redhat would use  "ifup $DEVICE"
ifconfig $DEVICE $IP broadcast $BC netmask $NM 

# on kernel 2.2 don't need to route, ifconfig does it for you
# if you do this, it will show two routes, it doesn't seem to hurt
route add -net $NW  netmask $NM $DEVICE

# Add static routes.Make sure you add the reverse routes on the other end

# route my regular ELAN
#route add -net 192.168.1.0 gw wxavier


#  the official redhat way
#  1) add entry to /etc/conf.modules
#  2) add a wlantcl initialization routine to /etc/rc.d/init.d
#     and set the appropriate startup inbetween #1 and #3
#  3) add eth1 interface to network via 'netcfg'