#ifndef	_IPXE_TFTP_H
#define	_IPXE_TFTP_H

/** @file
 *
 * TFTP protocol
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <stdint.h>

#define TFTP_PORT	       69 /**< Default TFTP server port */
#define	TFTP_DEFAULT_BLKSIZE  512 /**< Default TFTP data block size */
#define	TFTP_MAX_BLKSIZE     1432

#define TFTP_RRQ		1 /**< Read request opcode */
#define TFTP_WRQ		2 /**< Write request opcode */
#define TFTP_DATA		3 /**< Data block opcode */
#define TFTP_ACK		4 /**< Data block acknowledgement opcode */
#define TFTP_ERROR		5 /**< Error opcode */
#define TFTP_OACK		6 /**< Options acknowledgement opcode */

#define TFTP_ERR_FILE_NOT_FOUND	1 /**< File not found */
#define TFTP_ERR_ACCESS_DENIED	2 /**< Access violation */
#define TFTP_ERR_DISK_FULL	3 /**< Disk full or allocation exceeded */
#define TFTP_ERR_ILLEGAL_OP	4 /**< Illegal TFTP operation */
#define TFTP_ERR_UNKNOWN_TID	5 /**< Unknown transfer ID */
#define TFTP_ERR_FILE_EXISTS	6 /**< File already exists */
#define TFTP_ERR_UNKNOWN_USER	7 /**< No such user */
#define TFTP_ERR_BAD_OPTS	8 /**< Option negotiation failed */

#define MTFTP_PORT	     1759 /**< Default MTFTP server port */

/** A TFTP read request (RRQ) packet */
struct tftp_rrq {
	uint16_t opcode;
	char data[0];
} __attribute__ (( packed ));

/** A TFTP data (DATA) packet */
struct tftp_data {
	uint16_t opcode;
	uint16_t block;
	uint8_t data[0];
} __attribute__ (( packed ));
 
/** A TFTP acknowledgement (ACK) packet */
struct tftp_ack {
	uint16_t opcode;
	uint16_t block;
} __attribute__ (( packed ));

/** A TFTP error (ERROR) packet */
struct tftp_error {
	uint16_t opcode;
	uint16_t errcode;
	char errmsg[0];
} __attribute__ (( packed ));

/** A TFTP options acknowledgement (OACK) packet */
struct tftp_oack {
	uint16_t opcode;
	char data[0];
} __attribute__ (( packed ));

/** The common header of all TFTP packets */
struct tftp_common {
	uint16_t opcode;
} __attribute__ (( packed ));

/** A union encapsulating all TFTP packet types */
union tftp_any {
	struct tftp_common	common;
	struct tftp_rrq		rrq;
	struct tftp_data	data;
	struct tftp_ack		ack;
	struct tftp_error	error;
	struct tftp_oack	oack;
};

#endif /* _IPXE_TFTP_H */