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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 ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen
json_get_vars mtu ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen
[ -z "$ip6prefix" -o -z "$peeraddr" ] && {
proto_notify_error "$cfg" "MISSING_ADDRESS"
proto_block_restart "$cfg"
return
}
( proto_add_host_dependency "$cfg" 0.0.0.0 )
[ -z "$ipaddr" ] && {
local wanif
if ! network_find_wan wanif || ! network_get_ipaddr ipaddr "$wanif"; then
proto_notify_error "$cfg" "NO_WAN_LINK"
return
fi
}
# Determine the relay prefix.
local ip4prefixlen="${ip4prefixlen:-0}"
local ip4prefix=$(ipcalc.sh "$ipaddr/$ip4prefixlen" | grep NETWORK)
ip4prefix="${ip4prefix#NETWORK=}"
# Determine our IPv6 address.
local ip6subnet=$(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
proto_add_tunnel
json_add_string mode sit
json_add_int mtu "${mtu:-1280}"
json_add_int ttl "${ttl:-64}"
json_add_string local "$ipaddr"
json_add_string 6rd-prefix "$ip6prefix/$ip6prefixlen"
json_add_string 6rd-relay-prefix "$ip4prefix/$ip4prefixlen"
proto_close_tunnel
proto_send_update "$cfg"
}
proto_6rd_teardown() {
local cfg="$1"
}
proto_6rd_init_config() {
no_device=1
available=1
proto_config_add_int "mtu"
proto_config_add_int "ttl"
proto_config_add_string "ipaddr"
proto_config_add_string "peeraddr"
proto_config_add_string "ip6prefix"
proto_config_add_string "ip6prefixlen"
proto_config_add_string "ip4prefixlen"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol 6rd
}
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