From ccf238f852fd0463e68d33b91f0dd55000c325e3 Mon Sep 17 00:00:00 2001
From: Roy Marples <roy@marples.name>
Date: Wed, 26 Mar 2008 14:18:01 +0000
Subject: Merge net.OS into net

---
 net/ip6to4.sh | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 net/ip6to4.sh

(limited to 'net/ip6to4.sh')

diff --git a/net/ip6to4.sh b/net/ip6to4.sh
new file mode 100644
index 0000000..d58eb31
--- /dev/null
+++ b/net/ip6to4.sh
@@ -0,0 +1,99 @@
+# 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
+}
-- 
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