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#! /bin/bash
CheckForwarding () {
local sbase fwd
sbase=/proc/sys/net/ipv4/conf
fwd=0
if [ -d $sbase ]; then
for dir in $sbase/*/forwarding; do
fwd=$[$fwd + `cat $dir`]
done
else
fwd=2
fi
return $fwd
}
RestartRDISC () {
killall -HUP rdisc || rdisc -fs
}
ABCMaskLen () {
local class;
class=${1%%.*}
if [ "$1" = "" -o $class -eq 0 -o $class -ge 224 ]; then return 0
elif [ $class -ge 224 ]; then return 0
elif [ $class -ge 192 ]; then return 24
elif [ $class -ge 128 ]; then return 16
else return 8; fi
}
label="label $1"
ldev="$1"
dev=${1%:*}
if [ "$dev" = "" -o "$1" = "help" ]; then
echo "Usage: ifcfg DEV [[add|del [ADDR[/LEN]] [PEER] | stop]" 1>&2
echo " add - add new address" 1>&2
echo " del - delete address" 1>&2
echo " stop - completely disable IP" 1>&2
exit 1
fi
shift
CheckForwarding
fwd=$?
if [ $fwd -ne 0 ]; then
echo "Forwarding is ON or its state is unknown ($fwd). OK, No RDISC." 1>&2
fi
deleting=0
case "$1" in
add) shift ;;
stop)
if [ "$ldev" != "$dev" ]; then
echo "Cannot stop alias $ldev" 1>&2
exit 1;
fi
ip -4 addr flush dev $dev $label || exit 1
if [ $fwd -eq 0 ]; then RestartRDISC; fi
exit 0 ;;
del*)
deleting=1; shift ;;
*)
esac
ipaddr=
pfxlen=
if [ "$1" != "" ]; then
ipaddr=${1%/*}
if [ "$1" != "$ipaddr" ]; then
pfxlen=${1#*/}
fi
if [ "$ipaddr" = "" ]; then
echo "$1 is bad IP address." 1>&2
exit 1
fi
fi
shift
peer=$1
if [ "$peer" != "" ]; then
if [ "$pfxlen" != "" -a "$pfxlen" != "32" ]; then
echo "Peer address with non-trivial netmask." 1>&2
exit 1
fi
pfx="$ipaddr peer $peer"
else
if [ "$ipaddr" = "" ]; then
echo "Missing IP address argument." 1>&2
exit 1
fi
if [ "$pfxlen" = "" ]; then
ABCMaskLen $ipaddr
pfxlen=$?
fi
pfx="$ipaddr/$pfxlen"
fi
if [ "$ldev" = "$dev" -a "$ipaddr" != "" ]; then
label=
fi
if [ $deleting -ne 0 ]; then
ip addr del $pfx dev $dev $label || exit 1
if [ $fwd -eq 0 ]; then RestartRDISC; fi
exit 0
fi
if ! ip link set up dev $dev ; then
echo "Error: cannot enable interface $dev." 1>&2
exit 1
fi
if [ "$ipaddr" = "" ]; then exit 0; fi
if ! arping -q -c 2 -w 3 -D -I $dev $ipaddr ; then
echo "Error: some host already uses address $ipaddr on $dev." 1>&2
exit 1
fi
if ! ip address add $pfx brd + dev $dev $label; then
echo "Error: failed to add $pfx on $dev." 1>&2
exit 1
fi
arping -q -A -c 1 -I $dev $ipaddr
noarp=$?
( sleep 2 ;
arping -q -U -c 1 -I $dev $ipaddr ) >& /dev/null </dev/null &
ip route add unreachable 224.0.0.0/24 >& /dev/null
ip route add unreachable 255.255.255.255 >& /dev/null
if [ "`ip link ls $dev | grep -c MULTICAST`" -ge 1 ]; then
ip route add 224.0.0.0/4 dev $dev scope global >& /dev/null
fi
if [ $fwd -eq 0 ]; then
if [ $noarp -eq 0 ]; then
ip ro append default dev $dev metric 30000 scope global
elif [ "$peer" != "" ]; then
if ping -q -c 2 -w 4 $peer ; then
ip ro append default via $peer dev $dev metric 30001
fi
fi
RestartRDISC
fi
exit 0