eth.h

完整的Bell实验室的嵌入式文件系统TFS

/*********************************************************************
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/*
 * File:        eth.h
 * Purpose:     Definitions for Ethernet Frames.
 *
 * Modifications:
 */

#ifndef _ETH_H
#define _ETH_H

/*******************************************************************/

/* 48-bit Ethernet Addresses */
typedef uint8 ETH_ADDR[6];

/* 16-bit Ethernet Frame Type, ie. Protocol */
typedef uint16 ETH_FTYPE;

/* Defined Ethernet Frame Types */
#define FRAME_IP    (0x0800)
#define FRAME_ARP   (0x0806)
#define FRAME_RARP  (0x8035)

/* Maximum and Minimum Ethernet Frame Size (Data Field) */
#define ETH_MAX_SIZE    (1500)
#define ETH_MIN_SIZE    (46)

/* Ethernet Frame definition */
typedef struct
{
    ETH_ADDR dest;
    ETH_ADDR src;
    ETH_FTYPE type;
    uint8 data[ETH_MAX_SIZE];
} eth_frame_hdr;

/* Offset and size of protocol headers */
#define ETH_HDR_OFFSET  0   /* ethernet header at the top of the frame */
#define ETH_HDR_SIZE    14

/*******************************************************************/

#endif  /* _ETH_H */