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# 6in4.sh - IPv6-in-IPv4 tunnel backend
# Copyright (c) 2010 OpenWrt.org
find_6in4_wanif() {
local if=$(ip -4 r l e 0/0); if="${if#default via * dev }"; if="${if%% *}"
[ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
}
find_6in4_wanip() {
local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
echo "${ip%%/[0-9]* brd *}"
}
# Hook into scan_interfaces() to synthesize a .device option
# This is needed for /sbin/ifup to properly dispatch control
# to setup_interface_6in4() even if no .ifname is set in
# the configuration.
scan_6in4() {
config_set "$1" device "6in4-$1"
}
coldplug_interface_6in4() {
setup_interface_6in4 "6in4-$1" "$1"
}
setup_interface_6in4() {
local iface="$1"
local cfg="$2"
local link="6in4-$cfg"
local local4
config_get local4 "$cfg" ipaddr
local remote4
config_get remote4 "$cfg" peeraddr
local local6
config_get local6 "$cfg" ip6addr
local mtu
config_get mtu "$cfg" mtu
local ttl
config_get ttl "$cfg" ttl
local defaultroute
config_get_bool defaultroute "$cfg" defaultroute 1
# If local4 is unset, guess local IPv4 address from the
# interface used by the default route.
[ -z "$local4" ] && {
local wanif=$(find_6in4_wanif)
[ -n "$wanif" ] && {
local4=$(find_6in4_wanip "$wanif")
uci_set_state network "$cfg" wan_device "$wanif"
}
}
[ -n "$local4" ] && {
# 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
ip tunnel add $link mode sit remote $remote4 local $local4 ttl 255
ip link set $link up
ip link set mtu ${mtu:-1280} dev $link
ip tunnel change $link ttl ${ttl:-64}
ip addr add $local6 dev $link
uci_set_state network "$cfg" ipaddr $local4
uci_set_state network "$cfg" ip6addr $local6
[ "$defaultroute" = 1 ] && {
ip -6 route add ::/0 dev $link
uci_set_state network "$cfg" defaultroute 1
}
env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
} || {
echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
}
}
stop_interface_6in4() {
local cfg="$1"
local link="6in4-$cfg"
local local6=$(uci_get_state network "$cfg" ip6addr)
local defaultroute=$(uci_get_state network "$cfg" defaultroute)
grep -qs "^ *$link:" /proc/net/dev && {
env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
[ "$defaultroute" = "1" ] && {
ip -6 route del ::/0 dev $link
}
ip addr del $local6 dev $link
ip link set $link down
ip tunnel del $link
}
}
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