244 lines
5.7 KiB
Bash
Executable File
244 lines
5.7 KiB
Bash
Executable File
#!/bin/sh
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# 6to4.sh - IPv6-in-IPv4 tunnel backend
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# Copyright (c) 2010-2012 OpenWrt.org
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[ -n "$INCLUDE_ONLY" ] || {
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. /etc/functions.sh
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. ../netifd-proto.sh
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init_proto "$@"
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}
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find_6to4_wanif() {
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local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
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[ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
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}
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find_6to4_wanip() {
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local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
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echo "${ip%%[^0-9.]*}"
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}
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find_6to4_prefix() {
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local ip4="$1"
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local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
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printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
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}
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test_6to4_rfc1918()
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{
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local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
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[ $1 -eq 10 ] && return 0
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[ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
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[ $1 -eq 172 ] && [ $2 -ge 16 ] && [ $2 -le 31 ] && return 0
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# RFC 6598
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[ $1 -eq 100 ] && [ $2 -ge 64 ] && [ $2 -le 127 ] && return 0
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return 1
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}
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set_6to4_radvd_interface() {
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local cfgid="$1"
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local lanif="${2:-lan}"
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local ifmtu="${3:-1280}"
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local ifsection=""
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find_ifsection() {
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local net
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local cfg="$1"
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config_get net "$cfg" interface
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[ "$net" = "$lanif" ] && {
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ifsection="$cfg"
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return 1
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}
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}
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config_foreach find_ifsection interface
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[ -z "$ifsection" ] && {
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ifsection="iface_$sid"
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uci_set_state radvd "$ifsection" "" interface
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uci_set_state radvd "$ifsection" interface "$lanif"
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}
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uci_set_state radvd "$ifsection" ignore 0
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uci_set_state radvd "$ifsection" IgnoreIfMissing 1
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uci_set_state radvd "$ifsection" AdvSendAdvert 1
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uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
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uci_set_state radvd "$ifsection" AdvLinkMTU "$ifmtu"
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}
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set_6to4_radvd_prefix() {
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local cfgid="$1"
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local lanif="${2:-lan}"
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local wanif="${3:-wan}"
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local prefix="${4:-0:0:0:1::/64}"
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local vlt="${5:-300}"
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local plt="${6:-120}"
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local pfxsection=""
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find_pfxsection() {
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local net base
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local cfg="$1"
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config_get net "$cfg" interface
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config_get base "$cfg" Base6to4Interface
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[ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
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pfxsection="$cfg"
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return 1
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}
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}
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config_foreach find_pfxsection prefix
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[ -z "$pfxsection" ] && {
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pfxsection="prefix_${sid}_${lanif}"
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uci_set_state radvd "$pfxsection" "" prefix
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uci_set_state radvd "$pfxsection" ignore 0
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uci_set_state radvd "$pfxsection" interface "$lanif"
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uci_set_state radvd "$pfxsection" prefix "$prefix"
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uci_set_state radvd "$pfxsection" AdvOnLink 1
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uci_set_state radvd "$pfxsection" AdvAutonomous 1
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uci_set_state radvd "$pfxsection" AdvValidLifetime "$vlt"
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uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
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uci_set_state radvd "$pfxsection" Base6to4Interface "$wanif"
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}
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}
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tun_error() {
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local cfg="$1"; shift;
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[ -n "$1" ] && proto_notify_error "$cfg" "$@"
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proto_block_restart "$cfg"
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}
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proto_6to4_setup() {
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local cfg="$1"
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local iface="$2"
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local link="6to4-$cfg"
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json_get_var mtu mtu
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json_get_var ttl ttl
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json_get_var local4 ipaddr
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json_get_var adv_subnet adv_subnet
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json_get_var adv_interface adv_interface
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json_get_var adv_valid_lifetime adv_valid_lifetime
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json_get_var adv_preferred_lifetime adv_preferred_lifetime
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local wanif=$(find_6to4_wanif)
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[ -z "$wanif" ] && {
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tun_error "$cfg" "NO_WAN_LINK"
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return
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}
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. /lib/network/config.sh
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local wancfg="$(find_config "$wanif")"
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[ -z "$wancfg" ] && {
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tun_error "$cfg" "NO_WAN_LINK"
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return
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}
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# If local4 is unset, guess local IPv4 address from the
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# interface used by the default route.
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[ -z "$local4" ] && {
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[ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
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}
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[ -z "$local4" ] && {
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tun_error "$cfg" "NO_WAN_LINK"
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return
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}
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test_6to4_rfc1918 "$local4" && {
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tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
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return
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}
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# find our local prefix
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local prefix6=$(find_6to4_prefix "$local4")
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local local6="$prefix6::1"
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proto_init_update "$link" 1
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proto_add_ipv6_address "$local6" 16
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proto_add_ipv6_route "::" 0 "::192.88.99.1"
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proto_add_tunnel
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json_add_string mode sit
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json_add_int mtu "${mtu:-1280}"
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json_add_int ttl "${ttl:-64}"
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json_add_string local "$local4"
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proto_close_tunnel
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proto_send_update "$cfg"
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[ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
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local sid="6to4_$cfg"
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uci_revert_state radvd
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config_load radvd
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config_load network
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adv_subnet=$((0x${adv_subnet:-1}))
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local adv_subnets=""
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for adv_interface in ${adv_interface:-lan}; do
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local adv_ifname
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config_get adv_ifname "${adv_interface:-lan}" ifname
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grep -qs "^ *$adv_ifname:" /proc/net/dev && {
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local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
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logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
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ip -6 addr add $subnet6 dev $adv_ifname
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set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
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set_6to4_radvd_prefix "$sid" "$adv_interface" \
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"$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
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"$adv_valid_lifetime" "$adv_preferred_lifetime"
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adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
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adv_subnet=$(($adv_subnet + 1))
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}
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done
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uci_set_state network "$cfg" adv_subnets "$adv_subnets"
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/etc/init.d/radvd restart
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}
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}
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proto_6to4_teardown() {
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local cfg="$1"
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local link="6to4-$cfg"
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local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
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grep -qs "^ *$link:" /proc/net/dev && {
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[ -n "$adv_subnets" ] && {
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uci_revert_state radvd
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/etc/init.d/radvd enabled && /etc/init.d/radvd restart
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}
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}
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}
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proto_6to4_init_config() {
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no_device=1
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available=1
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proto_config_add_string "ipaddr"
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proto_config_add_int "mtu"
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proto_config_add_int "ttl"
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proto_config_add_string "adv_interface"
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proto_config_add_string "adv_subnet"
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proto_config_add_int "adv_valid_lifetime"
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proto_config_add_int "adv_preferred_lifetime"
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}
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[ -n "$INCLUDE_ONLY" ] || {
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add_protocol 6to4
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}
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