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#!/bin/bash
# Copyright (c) 2004-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# Contributed by Roy Marples (uberlord@gentoo.org)
# void ip6to4_depend(void)
#
# Sets up the dependancies for the module
ip6to4_depend() {
after interface
functions interface_exists interface_get_address interface_tunnel
}
# void ip6to4_expose(void)
#
# Expose variables that can be configured
ip6to4_expose() {
variables link
}
# bool ip6to4_start(char *interface)
#
# Configures IPv6 addresses to be added to the tunnel based on a IPv4
# addresses on a pre-configured interface.
# Returns 0 on success, otherwise 1.
ip6to4_start() {
local iface="$1" addr=""
local ifvar="$(bash_variable "${iface}")"
# Ensure the interface is sit0 if we're using ifconfig
if [[ " ${MODULES[@]} " == *" ifconfig "* && ${iface} != "sit0" ]] ; then
eerror "ip6to4 can only on interface sit0 using ifconfig"
eerror "emerge sys-apps/iproute2 to use other interfaces"
return 1
fi
local host="link_${ifvar}"
if [[ -z ${!host} ]] ; then
eerror "link_${ifvar} is not set"
return 1
fi
interface_exists "${!host}" true || return 1
# An interface can have more than 1 ip address
local -a addrs=( $(interface_get_address "${!host}") )
if [[ -z ${addrs} ]] ; then
eerror "${!host} is not configured with an IPv4 address"
return 1
fi
local -a new=()
local addr=""
for addr in "${addrs[@]}" ; do
# Strip the subnet
local ip="${addr%/*}" subnet="${addr#*/}"
# We don't work on private IPv4 addresses
[[ ${ip} == "127."* ]] && continue
[[ ${ip} == "10."* ]] && continue
[[ ${ip} == "192.168."* ]] && continue
local i
for ((i=16; i<32; i++)); do
[[ ${ip} == "172.${i}."* ]] && break
done
[[ ${i} -lt 32 ]] && continue
veinfo "IPv4 address on ${!host}: ${ip}"
local ip6="$(printf "2002:%02x%02x:%02x%02x::1" ${ip//./ })"
veinfo "Derived IPv6 address: ${ip6}"
# Now apply our IPv6 address to our config
new=( "${new[@]}" "${ip6}/16" )
done
if [[ -z ${new} ]] ; then
eerror "No global IPv4 addresses found on interface ${!host}"
return 1
fi
if [[ ${iface} != "sit0" ]] ; then
ebegin "Creating 6to4 tunnel on ${iface}"
interface_tunnel add "${iface}" mode sit ttl 255 remote any local "${ip}"
eend $? || return 1
fi
# Now apply our config
config=( "${config[@]}" "${new[@]}" )
# Add a route for us, ensuring we don't delete anything else
local routes="routes_${ifvar}[@]"
eval "routes_${ifvar}=( \"\${!routes}\" \
\"2003::/3 via ::192.88.99.1 metric 2147483647\" )"
}
# vim:ts=4
# vim: set ft=sh ts=4 :
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