#!/bin/sh +x

IP=/sbin/ip

SLICE=$1
SLICEID=`id -u $SLICE`
read LINKNUM
LINK=${SLICEID}$LINKNUM
read REMOTE
read KEY

modprobe ip_gre
modprobe etun

### Setup EGRE tunnel
EGRE=egre$LINK
$IP tunnel add $EGRE  mode gre/eth remote $REMOTE key $KEY
$IP link set $EGRE up

### Setup etun
ETUN0=veth$LINK
ETUN1=etun$LINK
echo $ETUN0,$ETUN1 > /sys/module/etun/parameters/newif
ifconfig $ETUN0 up
ifconfig $ETUN1 up

### Setup bridge
BRIDGE=br$LINK
brctl addbr $BRIDGE
brctl addif $BRIDGE $EGRE 
brctl addif $BRIDGE $ETUN1
ifconfig $BRIDGE up

### Create "grab link" script
GRAB=/vsys/grab-$ETUN0
cat > $GRAB <<EOF
#!/bin/sh

read PID

chcontext --ctx 1 -- echo \$PID > /sys/class/net/$ETUN0/new_ns_pid 
EOF
chmod +x $GRAB
echo $SLICE > $GRAB.acl