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#!/bin/sh
# 6to4.sh - IPv6-in-IPv4 tunnel backend
# Copyright (c) 2010-2012 OpenWrt.org
[ -n "$INCLUDE_ONLY" ] || {
. /etc/functions.sh
. ../netifd-proto.sh
init_proto "$@"
}
find_6to4_wanif() {
local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
[ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
}
find_6to4_wanip() {
local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
echo "${ip%%[^0-9.]*}"
}
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
return 1
}
set_6to4_radvd_interface() {
local cfgid="$1"
local lanif="${2:-lan}"
local ifmtu="${3:-1280}"
local ifsection=""
find_ifsection() {
local net
local cfg="$1"
config_get net "$cfg" interface
[ "$net" = "$lanif" ] && {
ifsection="$cfg"
return 1
}
}
config_foreach find_ifsection interface
[ -z "$ifsection" ] && {
ifsection="iface_$sid"
uci_set_state radvd "$ifsection" "" interface
uci_set_state radvd "$ifsection" interface "$lanif"
}
uci_set_state radvd "$ifsection" ignore 0
uci_set_state radvd "$ifsection" IgnoreIfMissing 1
uci_set_state radvd "$ifsection" AdvSendAdvert 1
uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
uci_set_state radvd "$ifsection" AdvLinkMTU "$ifmtu"
}
set_6to4_radvd_prefix() {
local cfgid="$1"
local lanif="${2:-lan}"
local wanif="${3:-wan}"
local prefix="${4:-0:0:0:1::/64}"
local vlt="${5:-300}"
local plt="${6:-120}"
local pfxsection=""
find_pfxsection() {
local net base
local cfg="$1"
config_get net "$cfg" interface
config_get base "$cfg" Base6to4Interface
[ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
pfxsection="$cfg"
return 1
}
}
config_foreach find_pfxsection prefix
[ -z "$pfxsection" ] && {
pfxsection="prefix_${sid}_${lanif}"
uci_set_state radvd "$pfxsection" "" prefix
uci_set_state radvd "$pfxsection" ignore 0
uci_set_state radvd "$pfxsection" interface "$lanif"
uci_set_state radvd "$pfxsection" prefix "$prefix"
uci_set_state radvd "$pfxsection" AdvOnLink 1
uci_set_state radvd "$pfxsection" AdvAutonomous 1
uci_set_state radvd "$pfxsection" AdvValidLifetime "$vlt"
uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
uci_set_state radvd "$pfxsection" Base6to4Interface "$wanif"
}
}
tun_error() {
local cfg="$1"; shift;
[ -n "$1" ] && proto_notify_error "$cfg" "$@"
proto_block_restart "$cfg"
}
proto_6to4_setup() {
local cfg="$1"
local iface="$2"
local link="6to4-$cfg"
json_get_var mtu mtu
json_get_var ttl ttl
json_get_var local4 ipaddr
json_get_var adv_subnet adv_subnet
json_get_var adv_interface adv_interface
json_get_var adv_valid_lifetime adv_valid_lifetime
json_get_var adv_preferred_lifetime adv_preferred_lifetime
local wanif=$(find_6to4_wanif)
[ -z "$wanif" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
. /lib/network/config.sh
local wancfg="$(find_config "$wanif")"
[ -z "$wancfg" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
# If local4 is unset, guess local IPv4 address from the
# interface used by the default route.
[ -z "$local4" ] && {
[ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
}
[ -z "$local4" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
test_6to4_rfc1918 "$local4" && {
tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
return
}
# find our local prefix
local prefix6=$(find_6to4_prefix "$local4")
local local6="$prefix6::1"
proto_init_update "$link" 1
proto_add_ipv6_address "$local6" 16
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 "$local4"
proto_close_tunnel
proto_send_update "$cfg"
[ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
local sid="6to4_$cfg"
uci_revert_state radvd
config_load radvd
adv_subnet=$((0x${adv_subnet:-1}))
local adv_subnets=""
for adv_interface in ${adv_interface:-lan}; do
local adv_ifname
config_get adv_ifname "${adv_interface:-lan}" ifname
grep -qs "^ *$adv_ifname:" /proc/net/dev && {
local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
ip -6 addr add $subnet6 dev $adv_ifname
set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
set_6to4_radvd_prefix "$sid" "$adv_interface" \
"$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
"$adv_valid_lifetime" "$adv_preferred_lifetime"
adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
adv_subnet=$(($adv_subnet + 1))
}
done
uci_set_state network "$cfg" adv_subnets "$adv_subnets"
/etc/init.d/radvd restart
}
}
proto_6to4_teardown() {
local cfg="$1"
local link="6to4-$cfg"
local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
grep -qs "^ *$link:" /proc/net/dev && {
[ -n "$adv_subnets" ] && {
uci_revert_state radvd
/etc/init.d/radvd enabled && /etc/init.d/radvd restart
}
}
}
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 "adv_interface"
proto_config_add_string "adv_subnet"
proto_config_add_int "adv_valid_lifetime"
proto_config_add_int "adv_preferred_lifetime"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol 6to4
}
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