#!/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 "NO_WAN_LINK" return } . /lib/network/config.sh local wancfg="$(find_config "$wanif")" [ -z "$wancfg" ] && { tun_error "NO_WAN_LINK" return } # If local4 is unset, guess local IPv4 address from the # interface used by the default route. [ -z "$local4" ] && { [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif") } [ -z "$local4" ] && { tun_error "NO_WAN_LINK" return } test_6to4_rfc1918 "$local4" && { tun_error "INVALID_LOCAL_ADDRESS" return } # find our local prefix local prefix6=$(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 }