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# Copyright (c) 2011 by Gentoo Foundation
# Released under the 2-clause BSD license.
_config_vars="$_config_vars link prefix suffix ipv4mask relay"
ip6rd_depend()
{
program ip
after interface
}
ip6rd_pre_start()
{
# ALL interfaces run pre_start blocks, not just those with something
# assigned, so we must check if we need to run on this interface before we
# do so.
local config
eval config=\$config_${IFVAR}
[ "$config" = "ip6rd" ] || return 0
case "${MODULES}" in
*" ifconfig "*)
eerror "ifconfig is not supported for 6rd"
eerror "Please emerge sys-apps/iproute2"
return 1
;;
esac
local host= suffix= relay= addr= iface=${IFACE} config_ip6rd= localip= ipv4mask=
eval host=\$link_${IFVAR}
if [ -z "${host}" ]; then
eerror "link_${IFVAR} not set"
return 1
fi
eval host=\${link_${IFVAR}}
eval ipv4mask=\${ipv4mask_${IFVAR}:-0}
eval suffix=\${suffix_${IFVAR}:-1}
eval relay=\${relay_${IFVAR}}
eval prefix=\${prefix_${IFVAR}}
IFACE=${host}
addrs=$(_get_inet_addresses)
IFACE=${iface}
if [ -z "${addrs}" ]; then
eerror "${host} is not configured with an IPv4 address"
return 1
fi
# TODO: Get this settings from DHCP (Option 212)
if [ -z "${prefix}" ]; then
eerror "prefix_${IFVAR} not set"
return 1
fi
if [ -z "${relay}" ]; then
eerror "relay_${IFVAR} not set"
return 1
fi
for addr in ${addrs}; do
# Strip the subnet
local ip="${addr%/*}" subnet="${addr#*/}"
# We don't work on private IPv4 addresses
if _ip6rd_inet_is_private_network "${ip}"
then
continue
fi
local ip6= ip6_prefix="${prefix%::/*}" ip6_subnet="${prefix#*/}"
ip6_subnet=$((ip6_subnet + (32-ipv4mask)))
eval ip6="$(printf "${ip6_prefix}:%s::%s" \
$(_ip6rd_prefix_shave_bits ${ip} ${ipv4mask}) ${suffix})"
veinfo "Derived IPv6 address: ${ip6}"
# Now apply our IPv6 address to our config
config_ip6rd="${config_ip6rd}${config_ip6rd:+ }${ip6}/${ip6_subnet}"
if [ -n "${localip}" ]; then
localip="any"
else
localip="${ip}"
fi
done
if [ -z "${config_ip6rd}" ]; then
eerror "No global IPv4 addresses found on interface ${host}"
return 1
fi
ebegin "Creating 6rd tunnel ${IFACE}"
if [ "${IFACE}" != "sit0" ]; then
_tunnel add "${IFACE}" mode sit ttl 255 remote any local "${localip}"
fi
_tunnel 6rd dev "${IFACE}" 6rd-prefix "${prefix}"
eend $? || return 1
_up
routes_ip6rd="2003::/3 via ::${relay} metric 2147483647"
service_set_value "config_ip6rd_$IFVAR" "$config_ip6rd"
service_set_value "routes_ip6rd_$IFVAR" "$routes_ip6rd"
}
ip6rd_start()
{
local config_ip6rd=$(service_get_value "config_ip6rd_$IFVAR")
local routes_ip6rd=$(service_get_value "routes_ip6rd_$IFVAR")
# Now apply our config
eval config_${config_index}=\'"${config_ip6rd}"\'
: $(( config_index -= 1 ))
# Add a route for us, ensuring we don't delete anything else
local routes="$(_get_array "routes_${IFVAR}")
$routes_ip6rd"
eval routes_${IFVAR}=\$routes
}
_ip6rd_inet_atoi()
{
local IFS="${IFS}." ipi=0 j=3
for i in $1 ; do
# post-decrement isn't valid
ipi=$(( ipi | (i << (8*j)) ))
j=$(( j - 1 ))
done
echo ${ipi}
}
_ip6rd_inet_itoa()
{
local ipi=$1 bitmask v
bitmask=$(( (1 << 24)-1 ))
for i in 0 1 2 3; do
v=$(( (ipi & ~bitmask) >> 24 ))
ipi=$(( (ipi & bitmask) << 8 ))
if [ $i != 3 ] ; then
printf "%d." $v
else
printf "%d\n" $v
fi
done
}
_ip6rd_inet_get_network()
{
local a=$(_ip6rd_inet_atoi $1)
local net=$(( a & ( (1<<$2)-1 ) ))
local cidr=$(( 32 - $2 ))
echo $(_ip6rd_inet_itoa $(( (net << cidr ) )) )
}
_ip6rd_inet_is_private_network()
{
if [ "$(_ip6rd_inet_get_network $1 16)" = "192.168.0.0" ]\
|| [ "$(_ip6rd_inet_get_network $1 8)" = "10.0.0.0" ]\
|| [ "$(_ip6rd_inet_get_network $1 12)" = "172.16.0.0" ]\
|| [ "$(_ip6rd_inet_get_network $1 16)" = "169.254.0.0" ]
then
return 0;
fi
return 1;
}
_ip6rd_prefix_shave_bits()
{
local ipi=
ipi=$(( ($(_ip6rd_inet_atoi $1) & (1<<(32-$2))-1) << $2))
if [ $2 -le 16 ]
then
printf "%04x:%0$(( (16-$2>>2)+(($2%4)?1:0) ))x" \
$((ipi >> 16)) $((ipi & (1<<(16-$2))-1))
elif [ $2 -lt 32 ]
then
printf "%0$(( (32-$2>>2)+(($2%4)?1:0) ))x" \
$((ipi >> 16))
fi
}
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