Added some TFTP definitions for use with the new UDP API.

src/include/gpxe/tftp.h

@@ -0,0 +1,125 @@
+#ifndef	_GPXE_TFTP_H
+#define	_GPXE_TFTP_H
+
+/** @file
+ *
+ * TFTP protocol
+ *
+ */
+
+#include <stdint.h>
+#include <gpxe/udp.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 */
+
+/** 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;
+	uint8_t 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;
+};	
+
+/**
+ * A TFTP session
+ *
+ * This data structure holds the state for an ongoing TFTP transfer.
+ */
+struct tftp_session {
+	/** UDP connection */
+	struct udp_connection udp;
+	/** Filename */
+	const char *filename;
+	/**
+	 * Transfer ID
+	 *
+	 * This is the transfer ID allocated by the server, used as
+	 * the server UDP port for all packets except the initial read
+	 * request.
+	 */
+	uint16_t tid;
+	/** Session state
+	 *
+	 * This is the block number to be used in the next ACK sent
+	 * back to the server, i.e. the number of the last received
+	 * data block.  The value zero indicates that the last
+	 * received block was an OACK (i.e. that the next ACK will
+	 * contain a block number of zero), and any value less than
+	 * zero indicates that the connection has not yet been opened
+	 * (i.e. that no blocks have yet been received).
+	 */
+	int state;
+	/** Data block size
+	 *
+	 * This is the "blksize" option negotiated with the TFTP
+	 * server.  (If the TFTP server does not support TFTP options,
+	 * this will default to 512).
+	 */
+	unsigned int blksize;
+	/** File size
+	 *
+	 * This is the value returned in the "tsize" option from the
+	 * TFTP server.  If the TFTP server does not support the
+	 * "tsize" option, this value will be zero.
+	 */
+	off_t tsize;
+};
+
+#endif /* _GPXE_TFTP_H */