commit aa12466ce21fbb1c4daac5cd33f1cfef5345ddd9
Author: Martin/Geno <geno+dev@fireorbit.de>
Date:   Tue Oct 29 16:50:31 2019 +0100

    init

diff --git a/clatd.sh b/clatd.sh
new file mode 100755
index 0000000..96b07a3
--- /dev/null
+++ b/clatd.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+
+color_default=$(tput setaf 7);
+color_config=$(tput setaf 3);
+color_error=$(tput setaf 1);
+color_log=$(tput setaf 8);
+echo "$(figlet jool clat)${color_log}"
+
+ip netns pids jool
+if [ $? -eq 0 ]; then
+	echo "${color_error}> already running - teardown ${color_log}"
+	ip netns del jool
+	exit 0
+fi
+
+#
+# TODO:
+# - get $nat64_subnet by ipv4only.arpa request
+# - skip if ipv4 default route exists
+# - improve $nat64_gw generation for ipv6 address in namespace
+# - improve subnet sizes - hardcoded /64 and /96
+
+nat64_subnet="64:ff9b::"
+echo "${color_default}detect nat64: ${color_config}$nat64_subnet${color_log}"
+
+ifname_ex="$(ip r g ${nat64_subnet}0 | grep -Po 'dev \K[0-9a-z]+')"
+echo "${color_default}over interface: ${color_config}$ifname_ex${color_log}"
+
+#
+# setup interfaces and namespace
+#
+
+echo "${color_default}> setup interfaces and namespace${color_log}"
+ip netns add jool
+ip link add name clat type veth peer name to_world
+ip link set up dev clat
+ip link set up dev to_world netns jool
+
+clat_ll=$(ip -6 address show scope link dev clat | grep -Po 'inet6 \K[0-9a-f:]+')
+internal_ll=$(ip netns exec jool ip -6 address show scope link dev to_world | grep -Po 'inet6 \K[0-9a-f:]+')
+
+
+#
+# setup network in namespace
+#
+
+echo "${color_default}> setup network in namespace${color_log}"
+
+nat64_gw="$(ip r g ${nat64_subnet}0  | grep -Po 'src \K[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:[0-9a-f]+:')$(echo $internal_ll | grep -Po 'fe80::\K[0-9a-f:]+')"
+
+echo "${color_default}generate internal ipv6 address: ${color_config}$nat64_gw${color_log}"
+ip netns exec jool ip -6 address add $nat64_gw/64 dev to_world
+ip netns exec jool ip -6 route add default via $clat_ll dev to_world
+ip netns exec jool ip -4 address add 192.0.0.1/29 dev to_world
+
+
+#
+# setup jool in namespace
+#
+
+echo "${color_default}> setup jool in namespace${color_log}"
+ip netns exec jool modprobe jool_siit
+if [ $? -ne 0 ]; then
+	echo "${color_error}module jool_siit not found${color_log}"
+	ip netns del jool
+	exit 1
+fi
+ip netns exec jool jool_siit instance add --netfilter --pool6 $nat64_subnet/96
+ip netns exec jool jool_siit eamt add 192.0.0.2 $nat64_gw
+
+
+#
+# routing ipv6 namespace
+#
+
+echo "${color_default}> routing ipv6 to namespace${color_log}"
+echo 1 > /proc/sys/net/ipv6/conf/$ifname_ex/proxy_ndp
+echo 1 | tee /proc/sys/net/ipv6/conf/*/forwarding
+ip -6 neigh add proxy $internal_ll dev $ifname_ex
+ip -6 route add $nat64_gw/96 via $internal_ll dev clat
+
+
+#
+# routing ipv4 to namespace
+#
+
+echo "${color_default}> routing ipv4 to namespace${color_log}"
+
+ip -4 address add 192.0.0.2/29 dev clat
+ip -4 route add default via 192.0.0.1 dev clat