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-rwxr-xr-xpackage/6to4/files/6to4.sh190
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diff --git a/package/6to4/files/6to4.sh b/package/6to4/files/6to4.sh
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+# 6to4.sh - IPv6-in-IPv4 tunnel backend
+# Copyright (c) 2010 OpenWrt.org
+
+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
+}
+
+# Hook into scan_interfaces() to synthesize a .device option
+# This is needed for /sbin/ifup to properly dispatch control
+# to setup_interface_6to4() even if no .ifname is set in
+# the configuration.
+scan_6to4() {
+ config_set "$1" device "6to4-$1"
+}
+
+coldplug_interface_6to4() {
+ setup_interface_6to4 "6to4-$1" "$1"
+}
+
+setup_interface_6to4() {
+ local iface="$1"
+ local cfg="$2"
+ local link="6to4-$cfg"
+
+ local local4=$(uci_get network "$cfg" ipaddr)
+
+ local remote4
+ config_get remote4 "$cfg" peeraddr
+
+ local mtu
+ config_get mtu "$cfg" mtu
+
+ local ttl
+ config_get ttl "$cfg" ttl
+
+ local defaultroute
+ config_get_bool defaultroute "$cfg" defaultroute 1
+
+ local wanif=$(find_6to4_wanif)
+ [ -z "$wanif" ] && {
+ logger -t "$link" "Cannot find wan interface - aborting"
+ return
+ }
+
+ local wancfg=$(find_config "$wanif")
+ [ -z "$wancfg" ] && {
+ logger -t "$link" "Cannot find wan network - aborting"
+ return
+ }
+
+ # If local4 is unset, guess local IPv4 address from the
+ # interface used by the default route.
+ [ -z "$local4" ] && {
+ [ -n "$wanif" ] && {
+ local4=$(find_6to4_wanip "$wanif")
+ uci_set_state network "$cfg" wan_device "$wanif"
+ }
+ }
+
+ [ -n "$local4" ] && {
+ logger -t "$link" "Starting ..."
+
+ # creating the tunnel below will trigger a net subsystem event
+ # prevent it from touching or iface by disabling .auto here
+ uci_set_state network "$cfg" ifname $link
+ uci_set_state network "$cfg" auto 0
+
+ # find our local prefix
+ local prefix6=$(find_6to4_prefix "$local4")
+ local local6="$prefix6::1/16"
+
+ logger -t "$link" " * IPv4 address is $local4"
+ logger -t "$link" " * IPv6 address is $local6"
+ ip tunnel add $link mode sit remote any local $local4 ttl ${ttl:-64}
+ ip link set $link up
+ ip link set mtu ${mtu:-1280} dev $link
+ ip addr add $local6 dev $link
+
+ uci_set_state network "$cfg" ipaddr $local4
+ uci_set_state network "$cfg" ip6addr $local6
+
+ [ "$defaultroute" = 1 ] && {
+ logger -t "$link" " * Adding default route"
+ ip -6 route add 2000::/3 via ::192.88.99.1 dev $link metric 1
+ uci_set_state network "$cfg" defaultroute 1
+ }
+
+ # find delegation target
+ local adv_interface
+ config_get adv_interface "$cfg" adv_interface
+
+ local adv_ifname
+ config_get adv_ifname "${adv_interface:-lan}" ifname
+
+ local adv_subnet=$(uci_get network "$cfg" adv_subnet)
+
+ grep -qs "^ *$adv_ifname:" /proc/net/dev && {
+ local subnet6="$prefix6:${adv_subnet:-1}::1/64"
+
+ logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
+ ip -6 addr add $subnet6 dev $adv_ifname
+ uci_set_state network "$cfg" adv_subnet "$subnet6"
+ uci_set_state network "$cfg" adv_ifname "$adv_ifname"
+
+ [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
+ local sid="6to4_$cfg"
+
+ uci -q batch <<-EOF
+ delete radvd.iface_$sid
+ delete radvd.prefix_$sid
+ set radvd.iface_$sid=interface
+ set radvd.iface_$sid.ignore=0
+ set radvd.iface_$sid.interface=${adv_interface:-lan}
+ set radvd.iface_$sid.IgnoreIfMissing=1
+ set radvd.iface_$sid.AdvSendAdvert=1
+ set radvd.iface_$sid.MaxRtrAdvInterval=30
+ set radvd.prefix_$sid=prefix
+ set radvd.prefix_$sid.ignore=0
+ set radvd.prefix_$sid.interface=${adv_interface:-lan}
+ set radvd.prefix_$sid.prefix=0:0:0:${adv_subnet:-1}::/64
+ set radvd.prefix_$sid.AdvOnLink=1
+ set radvd.prefix_$sid.AdvAutonomous=1
+ set radvd.prefix_$sid.AdvValidLifetime=300
+ set radvd.prefix_$sid.AdvPreferredLifetime=120
+ set radvd.prefix_$sid.Base6to4Interface=$wancfg
+ EOF
+
+ /etc/init.d/radvd restart
+ }
+ }
+
+ logger -t "$link" "... started"
+
+ env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
+ } || {
+ echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
+ }
+}
+
+stop_interface_6to4() {
+ local cfg="$1"
+ local link="6to4-$cfg"
+
+ local local6=$(uci_get_state network "$cfg" ip6addr)
+ local defaultroute=$(uci_get_state network "$cfg" defaultroute)
+
+ local adv_subnet=$(uci_get_state network "$cfg" adv_subnet)
+ local adv_ifname=$(uci_get_state network "$cfg" adv_ifname)
+
+ grep -qs "^ *$link:" /proc/net/dev && {
+ logger -t "$link" "Shutting down ..."
+ env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
+
+ [ -n "$adv_subnet" ] && [ -n "$adv_ifname" ] && {
+ local sid="6to4_$cfg"
+
+ uci -q batch <<-EOF
+ delete radvd.iface_$sid
+ delete radvd.prefix_$sid
+ EOF
+
+ /etc/init.d/radvd enabled && /etc/init.d/radvd restart
+
+ ip -6 addr del $adv_subnet dev $adv_ifname
+ }
+
+ [ "$defaultroute" = "1" ] && {
+ ip -6 route del 2000::/3 via ::192.88.99.1 dev $link metric 1
+ }
+
+ ip addr del $local6 dev $link
+ ip link set $link down
+ ip tunnel del $link
+
+ logger -t "$link" "... stopped"
+ }
+}