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Diffstat (limited to 'net-scripts/net.modules.d/ip6to4')
-rw-r--r-- | net-scripts/net.modules.d/ip6to4 | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/net-scripts/net.modules.d/ip6to4 b/net-scripts/net.modules.d/ip6to4 new file mode 100644 index 0000000..a833609 --- /dev/null +++ b/net-scripts/net.modules.d/ip6to4 @@ -0,0 +1,90 @@ +#!/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 + 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 |