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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 ipaddr
json_get_vars mtu ttl 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 "$prefix6::/48"
proto_add_ipv6_route "::" 0 "::192.88.99.1"
proto_add_tunnel
json_add_string mode sit
json_add_int mtu "${mtu:-1280}"
json_add_int ttl "${ttl:-64}"
json_add_string local "$ipaddr"
proto_close_tunnel
proto_send_update "$cfg"
}
proto_6to4_teardown() {
local cfg="$1"
}
proto_6to4_init_config() {
no_device=1
available=1
proto_config_add_string "ipaddr"
proto_config_add_int "mtu"
proto_config_add_int "ttl"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol 6to4
}
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