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#!/bin/sh
# 464xlat.sh - 464xlat CLAT
#
# Copyright (c) 2015 Steven Barth <cyrus@openwrt.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

[ -n "$INCLUDE_ONLY" ] || {
        . /lib/functions.sh
        . /lib/functions/network.sh
        . ../netifd-proto.sh
        init_proto "$@"
}

proto_464xlat_setup() {
        local cfg="$1"
        local iface="$2"
        local link="464-$cfg"

        local ip6addr ip6prefix tunlink zone
        json_get_vars ip6addr ip6prefix tunlink zone

        [ -z "$zone" ] && zone="wan"

        ( proto_add_host_dependency "$cfg" "::" "$tunlink" )

        if [ -z "$tunlink" ] && ! network_find_wan6 tunlink; then
                proto_notify_error "$cfg" "NO_WAN_LINK"
                return
        fi
        network_get_device tundev "$tunlink"

        ip6addr=$(464xlatcfg "$link" "$tundev" "$ip6prefix" 192.0.0.1 $ip6addr)
        if [ -z "$ip6addr" ]; then
                proto_notify_error "$cfg" "CLAT_CONFIG_FAILED"
                return
        fi

        ip -6 rule del from all lookup local
        ip -6 rule add from all lookup local pref 1
        ip -6 rule add to $ip6addr lookup prelocal pref 0
        echo "$ip6addr" > /tmp/464-$cfg-anycast

        proto_init_update "$link" 1
        proto_add_ipv4_route "0.0.0.0" 0 "" "" 2048
        proto_add_ipv6_route $ip6addr 128 "" "" "" "" 128

        proto_add_data
        [ "$zone" != "-" ] && json_add_string zone "$zone"

        json_add_array firewall
                json_add_object ""
                        json_add_string type nat
                        json_add_string target SNAT
                        json_add_string family inet
                        json_add_string snat_ip 192.0.0.1
                json_close_object
                json_add_object ""
                        json_add_string type rule
                        json_add_string family inet6
                        json_add_string proto all
                        json_add_string direction in
                        json_add_string dest "$zone"
                        json_add_string src "$zone"
                        json_add_string src_ip $ip6addr
                        json_add_string target ACCEPT
                json_close_object
        json_close_array
        proto_close_data

        proto_send_update "$cfg"
}

proto_464xlat_teardown() {
        local cfg="$1"
        local link="464-$cfg"

        [ -f /tmp/464-$cfg-anycast ] || return
        local ip6addr=$(cat /tmp/464-$cfg-anycast)

        464xlatcfg "$link"

        rm -rf /tmp/464-$cfg-anycast
        [ -n "$ip6addr" ] && ip -6 rule del to $ip6addr lookup prelocal

        if [ -z "$(ls /tmp/464-*-anycast 2>&-)" ]; then
                ip -6 rule del from all lookup local
                ip -6 rule add from all lookup local pref 0
        fi
}

proto_464xlat_init_config() {
        no_device=1
        available=1

        proto_config_add_string "ip6prefix"
        proto_config_add_string "ip6addr"
        proto_config_add_string "tunlink"
        proto_config_add_string "zone"
}

[ -n "$INCLUDE_ONLY" ] || {
        add_protocol 464xlat
}