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#!/bin/sh
# 6to4.sh - IPv6-in-IPv4 tunnel backend
# Copyright (c) 2010-2012 OpenWrt.org

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

find_6to4_prefix() {
        local ip4="$1"
        local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"

        printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
}

test_6to4_rfc1918()
{
        local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
        [ $1 -eq  10 ] && return 0
        [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
        [ $1 -eq 172 ] && [ $2 -ge  16 ] && [ $2 -le  31 ] && return 0

        # RFC 6598
        [ $1 -eq 100 ] && [ $2 -ge  64 ] && [ $2 -le 127 ] && return 0

        return 1
}

proto_6to4_setup() {
        local cfg="$1"
        local iface="$2"
        local link="6to4-$cfg"

        local mtu ttl tos ipaddr
        json_get_vars mtu ttl tos ipaddr

        ( proto_add_host_dependency "$cfg" 0.0.0.0 )

        local wanif
        if ! network_find_wan wanif; then
                proto_notify_error "$cfg" "NO_WAN_LINK"
                return
        fi

        [ -z "$ipaddr" ] && {
                if ! network_get_ipaddr ipaddr "$wanif"; then
                        proto_notify_error "$cfg" "NO_WAN_ADDRESS"
                        return
                fi
        }

        test_6to4_rfc1918 "$ipaddr" && {
                proto_notify_error "$cfg" "INVALID_LOCAL_ADDRESS"
                return
        }

        # find our local prefix
        local prefix6=$(find_6to4_prefix "$ipaddr")
        local local6="$prefix6::1"

        proto_init_update "$link" 1
        proto_add_ipv6_address "$local6" 16
        proto_add_ipv6_prefix "$prefix6::/48"

        proto_add_ipv6_route "::" 0 "::192.88.99.1" "" "" "$local6/16"
        proto_add_ipv6_route "::" 0 "::192.88.99.1" "" "" "$prefix6::/48"

        proto_add_tunnel
        json_add_string mode sit
        json_add_int mtu "${mtu:-1280}"
        json_add_int ttl "${ttl:-64}"
        [ -n "$tos" ] && json_add_string tos "$tos"
        json_add_string local "$ipaddr"
        proto_close_tunnel

        proto_send_update "$cfg"
}

proto_6to4_teardown() {
        local cfg="$1"
}

proto_6to4_init_config() {
        no_device=1
        available=1

        proto_config_add_string "ipaddr"
        proto_config_add_int "mtu"
        proto_config_add_int "ttl"
        proto_config_add_string "tos"
}

[ -n "$INCLUDE_ONLY" ] || {
        add_protocol 6to4
}