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      1 /*
      2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
      3  *              operating system.  INET is implemented using the  BSD Socket
      4  *              interface as the means of communication with the user level.
      5  *
      6  *              Global definitions for the ARCnet interface.
      7  *
      8  * Authors:     David Woodhouse and Avery Pennarun
      9  *
     10  *              This program is free software; you can redistribute it and/or
     11  *              modify it under the terms of the GNU General Public License
     12  *              as published by the Free Software Foundation; either version
     13  *              2 of the License, or (at your option) any later version.
     14  */
     15 
     16 #ifndef _LINUX_IF_ARCNET_H
     17 #define _LINUX_IF_ARCNET_H
     18 
     19 #include <linux/if_ether.h>
     20 
     21 
     22 /*
     23  *    These are the defined ARCnet Protocol ID's.
     24  */
     25 
     26 /* CAP mode */
     27 /* No macro but uses 1-8 */
     28 
     29 /* RFC1201 Protocol ID's */
     30 #define ARC_P_IP		212	/* 0xD4 */
     31 #define ARC_P_IPV6		196	/* 0xC4: RFC2497 */
     32 #define ARC_P_ARP		213	/* 0xD5 */
     33 #define ARC_P_RARP		214	/* 0xD6 */
     34 #define ARC_P_IPX		250	/* 0xFA */
     35 #define ARC_P_NOVELL_EC		236	/* 0xEC */
     36 
     37 /* Old RFC1051 Protocol ID's */
     38 #define ARC_P_IP_RFC1051	240	/* 0xF0 */
     39 #define ARC_P_ARP_RFC1051	241	/* 0xF1 */
     40 
     41 /* MS LanMan/WfWg "NDIS" encapsulation */
     42 #define ARC_P_ETHER		232	/* 0xE8 */
     43 
     44 /* Unsupported/indirectly supported protocols */
     45 #define ARC_P_DATAPOINT_BOOT	0	/* very old Datapoint equipment */
     46 #define ARC_P_DATAPOINT_MOUNT	1
     47 #define ARC_P_POWERLAN_BEACON	8	/* Probably ATA-Netbios related */
     48 #define ARC_P_POWERLAN_BEACON2	243	/* 0xF3 */
     49 #define ARC_P_LANSOFT		251	/* 0xFB - what is this? */
     50 #define ARC_P_ATALK		0xDD
     51 
     52 /* Hardware address length */
     53 #define ARCNET_ALEN	1
     54 
     55 /*
     56  * The RFC1201-specific components of an arcnet packet header.
     57  */
     58 struct arc_rfc1201
     59 {
     60     uint8_t  proto;		/* protocol ID field - varies		*/
     61     uint8_t  split_flag;	/* for use with split packets		*/
     62     uint16_t sequence;		/* sequence number			*/
     63     uint8_t  payload[0];	/* space remaining in packet (504 bytes)*/
     64 };
     65 #define RFC1201_HDR_SIZE 4
     66 
     67 
     68 /*
     69  * The RFC1051-specific components.
     70  */
     71 struct arc_rfc1051
     72 {
     73     uint8_t proto;		/* ARC_P_RFC1051_ARP/RFC1051_IP	*/
     74     uint8_t payload[0];		/* 507 bytes			*/
     75 };
     76 #define RFC1051_HDR_SIZE 1
     77 
     78 
     79 /*
     80  * The ethernet-encap-specific components.  We have a real ethernet header
     81  * and some data.
     82  */
     83 struct arc_eth_encap
     84 {
     85     uint8_t proto;		/* Always ARC_P_ETHER			*/
     86     struct ethhdr eth;		/* standard ethernet header (yuck!)	*/
     87     uint8_t payload[0];		/* 493 bytes				*/
     88 };
     89 #define ETH_ENCAP_HDR_SIZE 14
     90 
     91 
     92 struct arc_cap
     93 {
     94 	uint8_t proto;
     95 	uint8_t cookie[sizeof(int)];   /* Actually NOT sent over the network */
     96 	union {
     97 		uint8_t ack;
     98 		uint8_t raw[0];		/* 507 bytes */
     99 	} mes;
    100 };
    101 
    102 /*
    103  * The data needed by the actual arcnet hardware.
    104  *
    105  * Now, in the real arcnet hardware, the third and fourth bytes are the
    106  * 'offset' specification instead of the length, and the soft data is at
    107  * the _end_ of the 512-byte buffer.  We hide this complexity inside the
    108  * driver.
    109  */
    110 struct arc_hardware
    111 {
    112     uint8_t  source,		/* source ARCnet - filled in automagically */
    113              dest,		/* destination ARCnet - 0 for broadcast    */
    114     	     offset[2];		/* offset bytes (some weird semantics)     */
    115 };
    116 #define ARC_HDR_SIZE 4
    117 
    118 /*
    119  * This is an ARCnet frame header, as seen by the kernel (and userspace,
    120  * when you do a raw packet capture).
    121  */
    122 struct archdr
    123 {
    124     /* hardware requirements */
    125     struct arc_hardware hard;
    126 
    127     /* arcnet encapsulation-specific bits */
    128     union {
    129 	struct arc_rfc1201   rfc1201;
    130 	struct arc_rfc1051   rfc1051;
    131 	struct arc_eth_encap eth_encap;
    132 	struct arc_cap       cap;
    133 	uint8_t raw[0];		/* 508 bytes				*/
    134     } soft;
    135 };
    136 
    137 #endif				/* _LINUX_IF_ARCNET_H */
    138