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authorRoy Marples <roy@marples.name>2008-03-26 14:18:01 +0000
committerRoy Marples <roy@marples.name>2008-03-26 14:18:01 +0000
commitccf238f852fd0463e68d33b91f0dd55000c325e3 (patch)
treee104640ae7b25be54520c22712b34385b1c030c4 /net/ip6to4.sh
parent55858eca2ec678fce14b21df33d08f5aaac94bcf (diff)
Merge net.OS into net
Diffstat (limited to 'net/ip6to4.sh')
-rw-r--r--net/ip6to4.sh99
1 files changed, 99 insertions, 0 deletions
diff --git a/net/ip6to4.sh b/net/ip6to4.sh
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+++ b/net/ip6to4.sh
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+# Copyright 2007-2008 Roy Marples <roy@marples.name>
+# All rights reserved. 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
+}