openrc/net/ip6to4.sh
Robin H. Johnson acf77b73af net/ip6to4: Split to use pre_start and start so that other tunnel names work.
We need to create interfaces of custom names before we can sucessfully
start them. To do this, we have to add tunnels during prestart instead
of start. Split up the ip6to4 script to do this, saving the computed
variables for use in start with the new service data commands.

X-Gentoo-Bug: 372575
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=372575
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
2011-12-26 17:08:27 -08:00

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# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.
_config_vars="$_config_vars link suffix relay"
ip6to4_depend()
{
after interface
}
ip6to4_pre_start()
{
# ALL interfaces run pre_start blocks, not just those with something
# assigned, so we must check if we need to run on this interface before we
# do so.
local config
eval config=\$config_${IFVAR}
[ "$config" = "ip6to4" ] || return 0
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=${IFACE} config_ip6to4= localip=
eval host=\$link_${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: ${ip6}"
# Now apply our IPv6 address to our config
config_ip6to4="${config_ip6to4}${config_ip6to4:+ }${ip6}/48"
if [ -n "${localip}" ]; then
localip="any"
else
localip="${ip}"
fi
done
if [ -z "${config_ip6to4}" ]; 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 $? || return 1
_up
fi
routes_ip6to4="2003::/3 via ::${relay} metric 2147483647"
service_set_value "config_ip6to4_$IFVAR" "$config_ip6to4"
service_set_value "routes_ip6to4_$IFVAR" "$routes_ip6to4"
}
ip6to4_start()
{
local config_ip6to4=$(service_get_value "config_ip6to4_$IFVAR")
local routes_ip6to4=$(service_get_value "routes_ip6to4_$IFVAR")
# Now apply our config
eval config_${config_index}=\'"${config_ip6to4}"\'
: $(( config_index -= 1 ))
# Add a route for us, ensuring we don't delete anything else
local routes="$(_get_array "routes_${IFVAR}")
$routes_ip6to4"
eval routes_${IFVAR}=\$routes
}