ref: https://jool.mx/en/run-persistent.html

jool

#!/bin/sh /etc/rc.common
# Jool NAT64 service for OpenWrt

START=15

MODULE_NAME=jool
JOOL_BIN=/usr/bin/$MODULE_NAME
CONFIG_FILE=/etc/jool/$MODULE_NAME.conf

check_workspace() {
	[ -f "$JOOL_BIN" ] || exit
	[ -f "$CONFIG_FILE" ] || exit
}

compute_status() {
	STATUS=$($JOOL_BIN -f "$CONFIG_FILE" instance status 2>/dev/null | head -1)
	[ "$STATUS" = Running -o "$STATUS" = Dead ] || exit
}

add_module() {
	/sbin/modprobe $MODULE_NAME || exit
}

add_instance() {
	$JOOL_BIN file handle "$CONFIG_FILE" || exit
}

remove_instance() {
	$JOOL_BIN -f "$CONFIG_FILE" instance remove || exit
}

start() {
	check_workspace

	compute_status
	[ "$STATUS" = Running ] && return
	add_module
	add_instance
}

stop() {
	check_workspace

	compute_status
	[ "$STATUS" = Dead ] && return
	remove_instance
}

reload() {
	check_workspace

	add_module
	add_instance
}

jool.conf

{
	"comment": "Configuration for the NAT64 Jool service.",

	"instance": "example",
	"framework": "iptables",

	"global": {
		"pool6": "64:ff9b::/96"
	}
}

sysupgrade.conf

/etc/init.d/jool
/etc/jool/