netdev - udev and usb atm modems

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Date:	Sun, 21 Feb 2010 15:52:28 +0100
From:	Philippe De Muyter <phdm@...qel.be>
To:	chas3@...rs.sourceforge.net
Cc:	netdev@...r.kernel.org
Subject: udev and usb atm modems

Hi Chas,

Now that /sys/devices/virtual/atm/cxacru0/carrier is reliable, I can use
udev scripts to automate the connection to my provider.

Here they are :

$ cat /etc/udev/rules.d/99-atm.rules
KERNELS=="cxacru0", RUN="/usr/local/bin/atm"
KERNELS=="nas0", RUN="/usr/local/bin/nas"
$ cat /usr/local/bin/atm
#!/bin/sh
# for atm + pppoe
if [ $ACTION = "add" ]
then
	while [ "`cat /sys/devices/virtual/atm/cxacru0/carrier`" != 1 ]
	do
		sleep 1
	done
	/sbin/modprobe br2684
	/usr/sbin/br2684ctl -b -c 0 -a 0.32
	/sbin/ifconfig nas0 up
else
	/sbin/ifconfig nas0 down
	killall -9 br2684ctl
	while killall -0 br2684ctl
		do
			sleep 1
		done
	/sbin/rmmod br2684
fi
$ cat /usr/local/bin/nas
#!/bin/sh
echo `date` $ACTION $DEVPATH $SUBSYSTEM $INTERFACE >> /tmp/atm.log
if [ $ACTION = "add" ]
then
	/usr/sbin/pppd persist call pppoe nas0 user user@...vider defaultroute usepeerdns
else
	/sbin/killall pppd
fi
$

This works perfectly, but /usr/local/bin/atm does busy waiting for the carrier
to appear.  Do you know if the atm subsystem provides a event to udev when
carrier becomes 1 ?

Philippe
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