tftp.h

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#ifndef __TFTP_H
#define	__TFTP_H

/*
 * Trivial File Transfer Protocol (IEN-133)
 */
#define	SEGSIZE		512		/* data segment size */

/*
 * Packet types.
 */
#define	RRQ	01				/* read request */
#define	WRQ	02				/* write request */
#define	DATA	03				/* data packet */
#define	ACK	04				/* acknowledgement */
#define	ERROR	05				/* error code */

__packed struct	tftphdr {
	short	th_opcode;			/* packet type */
	__packed union {
		unsigned short	tu_block;	/* block # */
		short	tu_code;		/* error code */
		char	tu_stuff[1];		/* request packet stuff */
	} th_u;
	//char	th_data[0];			/* data or error string */
	//char th_data[1];
};

#define	th_block	th_u.tu_block
#define	th_code		th_u.tu_code
#define	th_stuff	th_u.tu_stuff
#define	th_msg		th_data

/*
 * Error codes.
 */
#define	EUNDEF		0		/* not defined */
#define	ENOTFOUND	1		/* file not found */
#define	EACCESS		2		/* access violation */
#define	ENOSPACE	3		/* disk full or allocation exceeded */
#define	EBADOP		4		/* illegal TFTP operation */
#define	EBADID		5		/* unknown transfer ID */
#define	EEXISTS		6		/* file already exists */
#define	ENOUSER		7		/* no such user */

int tftp_rcv_packet(struct sk_buff *skb);

#endif /* __TFTP_H */