2 # 6to4.sh - IPv6-in-IPv4 tunnel backend
3 # Copyright (c) 2010-2012 OpenWrt.org
5 [ -n "$INCLUDE_ONLY" ] || {
12 local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
13 [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
17 local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
18 echo "${ip%%[^0-9.]*}"
23 local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
25 printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
30 local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
31 [ $1 -eq 10 ] && return 0
32 [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
33 [ $1 -eq 172 ] && [ $2 -ge 16 ] && [ $2 -le 31 ] && return 0
36 [ $1 -eq 100 ] && [ $2 -ge 64 ] && [ $2 -le 127 ] && return 0
41 set_6to4_radvd_interface() {
43 local lanif="${2:-lan}"
44 local ifmtu="${3:-1280}"
50 config_get net "$cfg" interface
52 [ "$net" = "$lanif" ] && {
58 config_foreach find_ifsection interface
60 [ -z "$ifsection" ] && {
61 ifsection="iface_$sid"
62 uci_set_state radvd "$ifsection" "" interface
63 uci_set_state radvd "$ifsection" interface "$lanif"
66 uci_set_state radvd "$ifsection" ignore 0
67 uci_set_state radvd "$ifsection" IgnoreIfMissing 1
68 uci_set_state radvd "$ifsection" AdvSendAdvert 1
69 uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
70 uci_set_state radvd "$ifsection" AdvLinkMTU "$ifmtu"
73 set_6to4_radvd_prefix() {
75 local lanif="${2:-lan}"
76 local wanif="${3:-wan}"
77 local prefix="${4:-0:0:0:1::/64}"
85 config_get net "$cfg" interface
86 config_get base "$cfg" Base6to4Interface
88 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
94 config_foreach find_pfxsection prefix
96 [ -z "$pfxsection" ] && {
97 pfxsection="prefix_${sid}_${lanif}"
98 uci_set_state radvd "$pfxsection" "" prefix
99 uci_set_state radvd "$pfxsection" ignore 0
100 uci_set_state radvd "$pfxsection" interface "$lanif"
101 uci_set_state radvd "$pfxsection" prefix "$prefix"
102 uci_set_state radvd "$pfxsection" AdvOnLink 1
103 uci_set_state radvd "$pfxsection" AdvAutonomous 1
104 uci_set_state radvd "$pfxsection" AdvValidLifetime "$vlt"
105 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
106 uci_set_state radvd "$pfxsection" Base6to4Interface "$wanif"
111 local cfg="$1"; shift;
113 [ -n "$1" ] && proto_notify_error "$cfg" "$@"
114 proto_block_restart "$cfg"
120 local link="6to4-$cfg"
124 json_get_var local4 ipaddr
126 json_get_var adv_subnet adv_subnet
127 json_get_var adv_interface adv_interface
128 json_get_var adv_valid_lifetime adv_valid_lifetime
129 json_get_var adv_preferred_lifetime adv_preferred_lifetime
131 local wanif=$(find_6to4_wanif)
133 tun_error "$cfg" "NO_WAN_LINK"
137 . /lib/network/config.sh
138 local wancfg="$(find_config "$wanif")"
139 [ -z "$wancfg" ] && {
140 tun_error "$cfg" "NO_WAN_LINK"
144 # If local4 is unset, guess local IPv4 address from the
145 # interface used by the default route.
146 [ -z "$local4" ] && {
147 [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
150 [ -z "$local4" ] && {
151 tun_error "$cfg" "NO_WAN_LINK"
155 test_6to4_rfc1918 "$local4" && {
156 tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
160 # find our local prefix
161 local prefix6=$(find_6to4_prefix "$local4")
162 local local6="$prefix6::1"
164 proto_init_update "$link" 1
165 proto_add_ipv6_address "$local6" 16
166 proto_add_ipv6_route "::" 0 "::192.88.99.1"
169 json_add_string mode sit
170 json_add_int mtu "${mtu:-1280}"
171 json_add_int ttl "${ttl:-64}"
172 json_add_string local "$local4"
175 proto_send_update "$cfg"
177 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
178 local sid="6to4_$cfg"
180 uci_revert_state radvd
183 adv_subnet=$((0x${adv_subnet:-1}))
187 for adv_interface in ${adv_interface:-lan}; do
189 config_get adv_ifname "${adv_interface:-lan}" ifname
191 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
192 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
194 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
195 ip -6 addr add $subnet6 dev $adv_ifname
197 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
198 set_6to4_radvd_prefix "$sid" "$adv_interface" \
199 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
200 "$adv_valid_lifetime" "$adv_preferred_lifetime"
202 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
203 adv_subnet=$(($adv_subnet + 1))
207 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
209 /etc/init.d/radvd restart
213 proto_6to4_teardown() {
215 local link="6to4-$cfg"
217 local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
219 grep -qs "^ *$link:" /proc/net/dev && {
220 [ -n "$adv_subnets" ] && {
221 uci_revert_state radvd
222 /etc/init.d/radvd enabled && /etc/init.d/radvd restart
227 proto_6to4_init_config() {
231 proto_config_add_string "ipaddr"
232 proto_config_add_int "mtu"
233 proto_config_add_int "ttl"
234 proto_config_add_string "adv_interface"
235 proto_config_add_string "adv_subnet"
236 proto_config_add_int "adv_valid_lifetime"
237 proto_config_add_int "adv_preferred_lifetime"
240 [ -n "$INCLUDE_ONLY" ] || {