diff options
| -rw-r--r-- | net/ip6rd.sh | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/net/ip6rd.sh b/net/ip6rd.sh new file mode 100644 index 00000000..9da05768 --- /dev/null +++ b/net/ip6rd.sh @@ -0,0 +1,168 @@ +# 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 $1 ; do + ipi=$(( ipi | i << 8*j-- )) + done + echo ${ipi} +} + +_ip6rd_inet_itoa() +{ + local ipi=$1 + for i in 0 1 2 3; do + if [ $i != 3 ] ; then + printf "%d." $(( (ipi & ~((1<<24)-1)) >> 24 )) + ipi=$(( (ipi & ((1<<24)-1)) << 8)) + else + printf "%d\n" $(( (ipi & ~((1<<24)-1)) >> 24 )) + fi + done +} + +_ip6rd_inet_get_network() +{ + echo $(_ip6rd_inet_itoa $(( ($(_ip6rd_inet_atoi $1) & ((1<<$2)-1) << (32-$2) ) )) ) +} + +_ip6rd_inet_is_private_network() +{ + if [ "$(_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 +} |