Quelle if_arcnet.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
* INET         An implementation of the TCP/IP protocol suite for the LINUX
*              operating system.  INET is implemented using the  BSD Socket
*              interface as the means of communication with the user level.
*
*              Global definitions for the ARCnet interface.
*
* Authors:     David Woodhouse and Avery Pennarun
*
*              This program is free software; you can redistribute it and/or
*              modify it under the terms of the GNU General Public License
*              as published by the Free Software Foundation; either version
*              2 of the License, or (at your option) any later version.
*/

#ifndef _UAPI_LINUX_IF_ARCNET_H
#define _UAPI_LINUX_IF_ARCNET_H

#include <linux/types.h>
#include <linux/if_ether.h>

/*
*    These are the defined ARCnet Protocol ID's.
*/

/* CAP mode */
/* No macro but uses 1-8 */

/* RFC1201 Protocol ID's */
#define ARC_P_IP  212 /* 0xD4 */
#define ARC_P_IPV6  196 /* 0xC4: RFC2497 */
#define ARC_P_ARP  213 /* 0xD5 */
#define ARC_P_RARP  214 /* 0xD6 */
#define ARC_P_IPX  250 /* 0xFA */
#define ARC_P_NOVELL_EC  236 /* 0xEC */

/* Old RFC1051 Protocol ID's */
#define ARC_P_IP_RFC1051 240 /* 0xF0 */
#define ARC_P_ARP_RFC1051 241 /* 0xF1 */

/* MS LanMan/WfWg "NDIS" encapsulation */
#define ARC_P_ETHER  232 /* 0xE8 */

/* Unsupported/indirectly supported protocols */
#define ARC_P_DATAPOINT_BOOT 0 /* very old Datapoint equipment */
#define ARC_P_DATAPOINT_MOUNT 1
#define ARC_P_POWERLAN_BEACON 8 /* Probably ATA-Netbios related */
#define ARC_P_POWERLAN_BEACON2 243 /* 0xF3 */
#define ARC_P_LANSOFT  251 /* 0xFB - what is this? */
#define ARC_P_ATALK  0xDD

/* Hardware address length */
#define ARCNET_ALEN 1

/*
* The RFC1201-specific components of an arcnet packet header.
*/
struct arc_rfc1201 {
__u8  proto;  /* protocol ID field - varies */
__u8  split_flag; /* for use with split packets */
__be16   sequence; /* sequence number */
__u8  payload[]; /* space remaining in packet (504 bytes)*/
};
#define RFC1201_HDR_SIZE 4

/*
* The RFC1051-specific components.
*/
struct arc_rfc1051 {
__u8 proto;  /* ARC_P_RFC1051_ARP/RFC1051_IP */
__u8 payload[]; /* 507 bytes */
};
#define RFC1051_HDR_SIZE 1

/*
* The ethernet-encap-specific components.  We have a real ethernet header
* and some data.
*/
struct arc_eth_encap {
__u8 proto;  /* Always ARC_P_ETHER */
struct ethhdr eth; /* standard ethernet header (yuck!) */
__u8 payload[]; /* 493 bytes */
};
#define ETH_ENCAP_HDR_SIZE 14

struct arc_cap {
__u8 proto;
__u8 cookie[sizeof(int)];
    /* Actually NOT sent over the network */
union {
  __u8 ack;
  __u8 raw[0]; /* 507 bytes */
} mes;
};

/*
* The data needed by the actual arcnet hardware.
*
* Now, in the real arcnet hardware, the third and fourth bytes are the
* 'offset' specification instead of the length, and the soft data is at
* the _end_ of the 512-byte buffer.  We hide this complexity inside the
* driver.
*/
struct arc_hardware {
__u8 source;  /* source ARCnet - filled in automagically */
__u8 dest;  /* destination ARCnet - 0 for broadcast    */
__u8 offset[2];  /* offset bytes (some weird semantics)     */
};
#define ARC_HDR_SIZE 4

/*
* This is an ARCnet frame header, as seen by the kernel (and userspace,
* when you do a raw packet capture).
*/
struct archdr {
/* hardware requirements */
struct arc_hardware hard;

/* arcnet encapsulation-specific bits */
union {
  struct arc_rfc1201   rfc1201;
  struct arc_rfc1051   rfc1051;
  struct arc_eth_encap eth_encap;
  struct arc_cap       cap;
  __u8 raw[0]; /* 508 bytes */
} soft;
};

#endif    /* _UAPI_LINUX_IF_ARCNET_H */

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