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#!/bin/sh
# dslite.sh - IPv4-in-IPv6 tunnel backend
# Copyright (c) 2013 OpenWrt.org

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

proto_dslite_setup() {
        local cfg="$1"
        local iface="$2"
        local link="ds-$cfg"
        local remoteip6

        local mtu ttl peeraddr ip6addr tunlink zone weakif encaplimit
        json_get_vars mtu ttl peeraddr ip6addr tunlink zone weakif encaplimit

        [ -z "$peeraddr" ] && {
                proto_notify_error "$cfg" "MISSING_ADDRESS"
                proto_block_restart "$cfg"
                return
        }

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

        remoteip6=$(resolveip -6 "$peeraddr")
        if [ -z "$remoteip6" ]; then
                sleep 3
                remoteip6=$(resolveip -6 "$peeraddr")
                if [ -z "$remoteip6" ]; then
                        proto_notify_error "$cfg" "AFTR_DNS_FAIL"
                        return
                fi
        fi

        for ip6 in $remoteip6; do
                peeraddr=$ip6
                break
        done

        [ -z "$ip6addr" ] && {
                local wanif="$tunlink"
                if [ -z "$wanif" ] && ! network_find_wan6 wanif; then
                        proto_notify_error "$cfg" "NO_WAN_LINK"
                        return
                fi

                if ! network_get_ipaddr6 ip6addr "$wanif"; then
                        [ -z "$weakif" ] && weakif="lan"
                        if ! network_get_ipaddr6 ip6addr "$weakif"; then
                                proto_notify_error "$cfg" "NO_WAN_LINK"
                                return
                        fi
                fi
        }

        proto_init_update "$link" 1
        proto_add_ipv4_route "0.0.0.0" 0
        proto_add_ipv4_address "192.0.0.2" "" "" "192.0.0.1"

        proto_add_tunnel
        json_add_string mode ipip6
        json_add_int mtu "${mtu:-1280}"
        json_add_int ttl "${ttl:-64}"
        json_add_string local "$ip6addr"
        json_add_string remote "$peeraddr"
        [ -n "$tunlink" ] && json_add_string link "$tunlink"
        json_add_object "data"
          [ -n "$encaplimit" ] && json_add_string encaplimit "$encaplimit"
        json_close_object
        proto_close_tunnel

        proto_add_data
        [ -n "$zone" ] && json_add_string zone "$zone"

        json_add_array firewall
          json_add_object ""
            json_add_string type nat
            json_add_string target ACCEPT
          json_close_object
        json_close_array
        proto_close_data

        proto_send_update "$cfg"
}

proto_dslite_teardown() {
        local cfg="$1"
}

proto_dslite_init_config() {
        no_device=1             
        available=1

        proto_config_add_string "ip6addr"
        proto_config_add_string "peeraddr"
        proto_config_add_string "tunlink"
        proto_config_add_int "mtu"
        proto_config_add_int "ttl"
        proto_config_add_string "encaplimit"
        proto_config_add_string "zone"
        proto_config_add_string "weakif"
}

[ -n "$INCLUDE_ONLY" ] || {
        add_protocol dslite
}