OpenWrt – Rev 2

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

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

proto_6rd_setup() {
        local cfg="$1"
        local iface="$2"
        local link="6rd-$cfg"

        local mtu df ttl tos ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink zone
        json_get_vars mtu df ttl tos ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink zone

        [ -z "$ip6prefix" -o -z "$peeraddr" ] && {
                proto_notify_error "$cfg" "MISSING_ADDRESS"
                proto_block_restart "$cfg"
                return
        }

        ( proto_add_host_dependency "$cfg" "$peeraddr" "$tunlink" )

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

                if ! network_get_ipaddr ipaddr "$wanif"; then
                        proto_notify_error "$cfg" "NO_WAN_LINK"
                        return
                fi
        }

        # Determine the relay prefix.
        local ip4prefixlen="${ip4prefixlen:-0}"
        local ip4prefix
        eval "$(ipcalc.sh "$ipaddr/$ip4prefixlen")";ip4prefix=$NETWORK

        # Determine our IPv6 address.
        local ip6subnet=$(6rdcalc "$ip6prefix/$ip6prefixlen" "$ipaddr/$ip4prefixlen")
        local ip6addr="${ip6subnet%%::*}::1"

        # Determine the IPv6 prefix
        local ip6lanprefix="$ip6subnet/$(($ip6prefixlen + 32 - $ip4prefixlen))"

        proto_init_update "$link" 1
        proto_add_ipv6_address "$ip6addr" "$ip6prefixlen"
        proto_add_ipv6_prefix "$ip6lanprefix"

        proto_add_ipv6_route "::" 0 "::$peeraddr" 4096 "" "$ip6addr/$ip6prefixlen"
        proto_add_ipv6_route "::" 0 "::$peeraddr" 4096 "" "$ip6lanprefix"

        proto_add_tunnel
        json_add_string mode sit
        json_add_int mtu "${mtu:-1280}"
        json_add_boolean df "${df:-1}"
        json_add_int ttl "${ttl:-64}"
        [ -n "$tos" ] && json_add_string tos "$tos"
        json_add_string local "$ipaddr"
        [ -n "$tunlink" ] && json_add_string link "$tunlink"

        json_add_object 'data'
        json_add_string prefix "$ip6prefix/$ip6prefixlen"
        json_add_string relay-prefix "$ip4prefix/$ip4prefixlen"
        json_close_object

        proto_close_tunnel

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

        proto_send_update "$cfg"
}

proto_6rd_teardown() {
        local cfg="$1"
}

proto_6rd_init_config() {
        no_device=1
        available=1

        proto_config_add_int "mtu"
        proto_config_add_boolean "df"
        proto_config_add_int "ttl"
        proto_config_add_string "tos"
        proto_config_add_string "ipaddr"
        proto_config_add_string "peeraddr"
        proto_config_add_string "ip6prefix"
        proto_config_add_string "ip6prefixlen"
        proto_config_add_string "ip4prefixlen"
        proto_config_add_string "tunlink"
        proto_config_add_string "zone"
}

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