# Copyright (c) 2007-2008 Roy Marples # Released under the 2-clause BSD license. _config_vars="$_config_vars link suffix relay" ip6to4_depend() { after interface } ip6to4_start() { case " ${MODULES} " in *" ifconfig "*) if [ "${IFACE}" != "sit0" ]; then eerror "ip6to4 can only work on the sit0 interface using ifconfig" eerror "emerge sys-apps/iproute2 to use other interfaces" return 1 fi esac local host= suffix= relay= addr= iface=${IFACE} new= localip= eval host=\$link_${IFVAR} if [ -z "${host}" ]; then eerror "link_${IFVAR} not set" return 1 fi eval suffix=\${suffix_${IFVAR}:-1} eval relay=\${relay_${IFVAR}:-192.88.99.1} IFACE=${host} addrs=$(_get_inet_addresses) IFACE=${iface} if [ -z "${addrs}" ]; then eerror "${host} is not configured with an IPv4 address" return 1 fi for addr in ${addrs}; do # Strip the subnet local ip="${addr%/*}" subnet="${addr#*/}" # We don't work on private IPv4 addresses case "${ip}" in 127.*) continue;; 10.*) continue;; 192.168.*) continue;; 172.*) local i=16 while [ ${i} -lt 32 ]; do case "${ip}" in 172.${i}.*) break;; esac : $(( i += 1 )) done [ ${i} -lt 32 ] && continue ;; esac veinfo "IPv4 address on ${host}: ${ip}/${subnet}" local ipa= ip6= IFS="${IFS}." for i in ${ip}; do ipa="${ipa} ${i}" done unset IFS eval ip6="$(printf "2002:%02x%02x:%02x%02x::%s" ${ipa} ${suffix})" veinfo "Derived IPv6 address: ${ip6}" # Now apply our IPv6 address to our config new="${new}${new:+ }${ip6}/16" if [ -n "${localip}" ]; then localip="any" else localip="${ip}" fi 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 ${IFACE}" _tunnel add "${IFACE}" mode sit ttl 255 remote any local "${localip}" eend $? || return 1 _up fi # Now apply our config eval config_${config_index}=\'"${new}"\' : $(( config_index -= 1 )) # Add a route for us, ensuring we don't delete anything else local routes="$(_get_array "routes_${IFVAR}") 2003::/3 via ::${relay} metric 2147483647" eval routes_${IFVAR}=\$routes }