100 lines
2.2 KiB
Bash
100 lines
2.2 KiB
Bash
# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
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# Released under the 2-clause BSD license.
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_config_vars="$_config_vars link suffix relay"
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ip6to4_depend()
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{
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after interface
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}
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ip6to4_start()
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{
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case " ${MODULES} " in
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*" ifconfig "*)
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if [ "${IFACE}" != "sit0" ]; then
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eerror "ip6to4 can only work on the sit0 interface using ifconfig"
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eerror "emerge sys-apps/iproute2 to use other interfaces"
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return 1
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fi
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esac
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local host= suffix= relay= addr= iface=${IFACE} new= localip=
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eval host=\$link_${IFVAR}
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if [ -z "${host}" ]; then
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eerror "link_${IFVAR} not set"
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return 1
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fi
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eval suffix=\${suffix_${IFVAR}:-1}
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eval relay=\${relay_${IFVAR}:-192.88.99.1}
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IFACE=${host}
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addrs=$(_get_inet_addresses)
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IFACE=${iface}
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if [ -z "${addrs}" ]; then
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eerror "${host} is not configured with an IPv4 address"
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return 1
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fi
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for addr in ${addrs}; do
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# Strip the subnet
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local ip="${addr%/*}" subnet="${addr#*/}"
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# We don't work on private IPv4 addresses
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case "${ip}" in
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127.*) continue;;
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10.*) continue;;
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192.168.*) continue;;
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172.*)
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local i=16
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while [ ${i} -lt 32 ]; do
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case "${ip}" in
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172.${i}.*) break;;
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esac
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i=$((${i} + 1))
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done
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[ ${i} -lt 32 ] && continue
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;;
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esac
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veinfo "IPv4 address on ${host}: ${ip}/${subnet}"
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local ipa= ip6= IFS="${IFS}."
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for i in ${ip}; do
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ipa="${ipa} ${i}"
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done
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unset IFS
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eval ip6="$(printf "2002:%02x%02x:%02x%02x::%s" ${ipa} ${suffix})"
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veinfo "Derived IPv6 address: ${ip6}"
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# Now apply our IPv6 address to our config
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new="${new}${new:+ }${ip6}/16"
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if [ -n "${localip}" ]; then
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localip="any"
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else
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localip="${ip}"
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fi
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done
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if [ -z "${new}" ]; then
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eerror "No global IPv4 addresses found on interface ${host}"
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return 1
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fi
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if [ "${IFACE}" != "sit0" ]; then
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ebegin "Creating 6to4 tunnel on ${IFACE}"
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_tunnel add "${IFACE}" mode sit ttl 255 remote any local "${localip}"
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eend $? || return 1
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_up
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fi
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# Now apply our config
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eval config_${config_index}=\'"${new}"\'
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config_index=$((${config_index} - 1))
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# Add a route for us, ensuring we don't delete anything else
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local routes="$(_get_array "routes_${IFVAR}")
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2003::/3 via ::${relay} metric 2147483647"
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eval routes_${IFVAR}=\$routes
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}
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