module UECUPS_Types {

import from General_Types all;
import from Osmocom_Types all;

const integer UECUPS_SCTP_PORT := 4268;

type enumerated UECUPS_AddrType {
	IPV4	(1),
	IPV6	(2)
};

type enumerated UECUPS_Result {
	OK			(1),
	ERR_INVALID_DATA	(2),
	ERR_NOT_FOUND		(3)
};

type record UECUPS_SockAddr {
	UECUPS_AddrType	addr_type,
	OCT4_16n	ip,
	uint16_t	Port
};

/* Create a new GTP-U tunnel in the user plane */
type record UECUPS_CreateTun {
	/* TEID in transmit + receive direction */
	uint32_t	tx_teid,
	uint32_t	rx_teid,

	/* user address (allocated inside the tunnel) */
	UECUPS_AddrType user_addr_type,
	OCT4_16n	user_addr,

	/* GTP endpoint (UDP IP/Port tuples) */
	UECUPS_SockAddr local_gtp_ep,
	UECUPS_SockAddr remote_gtp_ep,

	/* TUN device */
	charstring	tun_dev_name,
	charstring	tun_netns_name optional
};

type record UECUPS_CreateTunRes {
	UECUPS_Result	result
};

/* Destroy an existing GTP-U tunnel in the user plane */
type record UECUPS_DestroyTun {
	/* local GTP endpoint + TEID are sufficient for unique identification */
	UECUPS_SockAddr local_gtp_ep,
	uint32_t	rx_teid
};

type record UECUPS_DestroyTunRes {
	UECUPS_Result	result
};

/* User requests deaemon to start a program in given network namespace */
type record UECUPS_StartProgram {
	/* the command to be started (with optional environment entries) */
	charstring	command,
	charstring_list	environment optional,
	/* user + group to use when starting command */
	charstring	run_as_user,
	/* network namespace in which to start the command */
	charstring      tun_netns_name optional
};
type record of charstring charstring_list;

/* Daemon informs us that a program has been started */
type record UECUPS_StartProgramRes {
	UECUPS_Result	result,
	integer		pid
};

/* Daemon informs us that a program has terminated */
type record UECUPS_ProgramTermInd {
	integer		pid,
	integer		exit_code
};

type record UeCUPS_ResetAllState {
};

type record UeCUPS_ResetAllStateRes {
	UECUPS_Result	result
};

type union PDU_UECUPS {
	UECUPS_CreateTun	create_tun,
	UECUPS_CreateTunRes	create_tun_res,

	UECUPS_DestroyTun	destroy_tun,
	UECUPS_DestroyTunRes	destroy_tun_res,

	UECUPS_StartProgram	start_program,
	UECUPS_StartProgramRes	start_program_res,
	UECUPS_ProgramTermInd	program_term_ind,

	UeCUPS_ResetAllState	reset_all_state,
	UeCUPS_ResetAllStateRes	reset_all_state_res
};


external function f_enc_PDU_UECUPS(in PDU_UECUPS inp) return octetstring
        with { extension "prototype(convert) encode(JSON)" }
external function f_dec_PDU_UECUPS(in octetstring inp) return PDU_UECUPS
        with { extension "prototype(convert) decode(JSON)" }


private function f_get_addrtype(OCT4_16n addr) return UECUPS_AddrType
{
	if (lengthof(addr) == 4) {
		return IPV4;
	} else {
		return IPV6;
	}
}

private const integer GTP1U_PORT := 2152;

template (value) UECUPS_SockAddr
ts_UECUPS_SockAddr(OCT4_16n ip, uint16_t Port := GTP1U_PORT) := {
	addr_type := f_get_addrtype(ip),
	ip := ip,
	Port := Port
}


} with { encode "JSON" };