#!/bin/bash

# Sample if-up

# Some environment variables will be set:
#
# CONFBASE=/etc/vpe	# the configuration directory prefix
# IFNAME=vpn0		# the network interface (ifname)
# MAC=fe:fd:80:00:00:01	# the mac-address to use for the interface
# NODENAME=cerebro	# the selected nodename (-n switch)
# NODEID=1		# the numerical node id
# MTU=1436		# the tunnel packet overhead (set mtu to 1500-$OVERHEAD)

# with the --fw switch, outputs mac/net pairs for your firewall use:
# if-up --fw | while read mac net; do
#   iptables -t filter -A INPUT -i vpn0 -p all -m mac --mac-source \! $mac -s $net -j DROP
# done

ipn() {
   local id="$1"; shift
   local mac=fe:fd:80:00:00:$(printf "%02x" $id)
   if [ -n "$FW" ]; then
      for net in "$@"; do
         echo "$mac $net"
      done
   else
      local ip="$1"; shift
      if [ "$id" == $NODEID ]; then
         [ -n "$ADDR_ONLY" ] && ip addr add $ip broadcast 10.255.255.255 dev $IFNAME
      elif [ -z "$ADDR_ONLY" ]; then
         ip neighbour add $ip lladdr $mac nud permanent dev $IFNAME
         for route in "$@"; do
            ip route add $route via $ip dev vpn0
         done
      fi
   fi
}

ipns() {
   ipn  1 10.0.0.20
   ipn  2 10.0.0.5  10.0.0.0/28 129.13.162.92 129.13.162.93 213.69.218.222
   ipn  3 10.0.0.17
   ipn  4 10.0.0.18
   ipn  5 10.0.0.19
   ipn  6 10.0.0.21 10.0.2.0/26 129.13.162.17
   ipn  7 10.0.0.22 10.1.2.0/24
   ipn  8 10.0.0.23
   ipn  9 10.0.0.24 10.13.0.0/16
   ipn 10 10.0.0.25
   ipn 11 10.0.0.26
   ipn 12 10.0.0.27 10.0.2.64/26
   ipn 13 10.0.0.28
   ipn 14 10.0.0.29 10.1.1.0/24
}

if [ "$1" == "--fw" ]; then
   FW=1

   ipns
else
   exec >/var/log/vpe.if-up 2>&1
   set -x

   [ $NODENAME = "ruth"    ] && ip link set $IFNAME down # hack

   ip link set $IFNAME address $MAC mtu $MTU up
   ADDR_ONLY=1 ipns # set addr only

   ip route add 10.0.0.0/8 dev $IFNAME
   ip route add 10.0.0.0/27 dev $IFNAME

   ipns # set routes

   echo 0 >/proc/sys/net/ipv4/conf/vpn0/proxy_arp 

   if [ $NODENAME = doom ]; then
      ip addr add 129.13.162.92 dev $IFNAME
      ip route add 129.13.0.0/16 via 10.0.0.17 dev $IFNAME
      ip route flush table 101
      ip route add table 101 default src 129.13.162.92 via 10.0.0.17

      ip addr add 213.69.218.222 dev $IFNAME
      ip route add 213.69.218.192/27 via 10.0.0.19 dev $IFNAME
      ip route flush table 103
      ip route add table 103 default src 213.69.218.222 via 10.0.0.19

   elif [ $NODENAME = marco ]; then
      ip addr add 129.13.162.17 dev $IFNAME
      ip route add 129.13.162.95 dev ppp0
      ip route add 129.13.76.0/23 dev ppp0
      ip route add src 129.13.162.17 129.13.0.0/16 via 10.0.0.17 dev $IFNAME

   fi

   [ $NODENAME != fwkw ] && ip route add 10.0.0.0/24 via 10.0.0.29 dev $IFNAME
fi