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).
#============================================================================

# Initial IPv6 patch by BenV
# http://notes.benv.junerules.com/all/software/xen-and-routed-ipv6/

# Additional IPv6 patch by mrngm for delivering subnets to domU
# http://mrngm.com/hetzner-ipv6.txt

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

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

ip6_get_subnet_part()
{
	echo "$1" | perl -wane '/(([0-9a-f]+:*)+)/ && print $1;' | cut -d \: -f 5
}
ip6_get_subnet()
{
	echo "$1" | perl -wane '/(([0-9a-f]+:*)+)/ && print $1;' | cut -d \: -f -5
}

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

is_ipv6()
{
	echo "$1" | grep -q ':' && echo "yes" || echo "no"
}

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

case "${command}" in
    online)
	log info "[vif-route] online request, ip ${ip} with main_ip ${main_ip} and main_ip6 ${main_ip6} for $vif."
        ifconfig ${vif} ${main_ip} netmask 255.255.255.255 up
	if [ ! -z "${main_ip6}" ]; then
		ip -6 addr add ${main_ip6} dev ${vif}
		echo 1 > /proc/sys/net/ipv6/conf/${vif}/proxy_ndp
	fi
        echo 1 >/proc/sys/net/ipv4/conf/${vif}/proxy_arp
        ipcmd='add'
        cmdprefix=''
        ;;
    offline)
        do_without_error ifdown ${dev}
        ipcmd='del'
        cmdprefix='do_without_error'
        ;;
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
#      ${cmdprefix} ip route ${ipcmd} ${addr} dev ${vif} src ${main_ip}
	result=$(is_ipv6 "${addr}")
	if [ "${result}" == "no" ] ; then
		log info "[vif-route] Adding IPv4 address ${addr} with src ${main_ip} for $vif."
	      result=`${cmdprefix} ip route ${ipcmd} ${addr} dev ${vif} src ${main_ip} 2>&1`
	else
		log info "[vif-route] Adding IPv6 address ${addr} with src ${main_ip6} for $vif."
	      result=`${cmdprefix} ip -6 route ${ipcmd} ${addr} dev ${vif} src ${main_ip6} 2>&1`
		log info "[vif-route] Adding IPv6 route for $(ip6_get_subnet "${addr}")::/80 to ${addr}."
	      result=`${cmdprefix} ip -6 route ${ipcmd} $(ip6_get_subnet "${addr}")::/80 via ${addr} 2>&1`
		log info "[vif-route] Adding IPv6 neighbor proxy for ${addr}."
	      result=`${cmdprefix} ip -6 neighbor ${ipcmd} proxy ${addr} dev ${netdev:-eth0} 2>&1`
	fi
    done 
fi

handle_iptable

call_hooks vif post

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