our-vif-route

#!/bin/bash
#============================================================================
# ${XEN_SCRIPT_DIR}/vif-route
#
# Script for configuring a vif in routed mode.
# The hotplugging system will call this script if it is specified either in
# the device configuration given to Xend, or the default Xend configuration
# in ${XEN_CONFIG_DIR}/xend-config.sxp.  If the script is specified in
# neither of those places, then vif-bridge is the default.
#
# Usage:
# vif-route (add|remove|online|offline)
#
# Environment vars:
# dev         vif interface name (required).
# XENBUS_PATH path to this device's details in the XenStore (required).
#
# Read from the store:
# ip      list of IP networks for the vif, space-separated (default given in
#         this script).
#============================================================================

dir=$(dirname "$0")
. "${dir}/vif-common.sh"

ip6_of()
{
	ip -6 addr show "$1" | perl -wane '/scope global/ && /inet6 (([0-9a-f]+:*)+)/ && print $1;'
}

dom0_ip6()
{
  local nd=${netdev:-eth0}
  local result=$(ip6_of "$nd")
  if [ -z "$result" ]
  then
	""
  else
	echo "$result"
  fi
}

is_ipv6()
{
	echo "$1" | perl -wane '/:/ && print "yes"'
}

main_ip=$(dom0_ip)
main_ip6=$(dom0_ip6)

case "${command}" in
    online)
        ifconfig ${dev} 10.0.0.1 netmask 255.255.255.255 up
        if [ ! -z "${main_ip6}" ]; then
                ip -6 addr add ${main_ip6} dev ${vif}
        fi
        echo 1 >/proc/sys/net/ipv4/conf/${dev}/proxy_arp
        ipcmd='add'
        cmdprefix=''
        ;;
    offline)
        do_without_error ifdown ${dev}
        ipcmd='del'
        cmdprefix='do_without_error'
        ;;
    add) # workaround
        exit
        ;;
    del) # workaround
        exit
        ;;
esac

if [ "${ip}" ] ; then
    # If we've been given a list of IP addresses, then add routes from dom0 to
    # the guest using those addresses.
    for addr in ${ip} ; do
      result=$(is_ipv6 "${addr}")
      if [ -z "${result}" ] ; then
         ${cmdprefix} ip route ${ipcmd} ${addr} dev ${dev} src ${main_ip}
      else
         ${cmdprefix} ip -6 route ${ipcmd} ${addr} dev ${dev} src ${main_ip6}
      fi
    done
fi

handle_iptable

call_hooks vif post

log debug "Successful vif-route ${command} for ${dev}."
if [ "${command}" = "online" ]
then
  success
fi