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# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# 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.${i}.*) break;;
esac
i=$((${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}=\'"${new}"\'
config_index=$((${config_index} - 1))
# Add a route for us, ensuring we don't delete anything else
local routes="$(_get_array "routes_${IFVAR}")
2003::/3 via ::${relay} metric 2147483647"
eval routes_${IFVAR}=\$routes
}
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