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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 mtu
config_get mtu "$cfg" mtu
local ttl
config_get ttl "$cfg" ttl
local metric
config_get metric "$cfg" metric
local defaultroute
config_get_bool defaultroute "$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 metric ${metric:-1} dev $link
uci_set_state network "$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
revert radvd.iface_$sid
revert radvd.prefix_$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_$cfg"
uci -q batch <<-EOF
revert radvd.iface_$sid
revert 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"
}
}
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