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1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */2/*3 * INET An implementation of the TCP/IP protocol suite for the LINUX4 * operating system. INET is implemented using the BSD Socket5 * interface as the means of communication with the user level.6 *7 * Global definitions for the ARCnet interface.8 *9 * Authors: David Woodhouse and Avery Pennarun10 *11 * This program is free software; you can redistribute it and/or12 * modify it under the terms of the GNU General Public License13 * as published by the Free Software Foundation; either version14 * 2 of the License, or (at your option) any later version.15 */16 17#ifndef _LINUX_IF_ARCNET_H18#define _LINUX_IF_ARCNET_H19 20#include <linux/types.h>21#include <linux/if_ether.h>22 23/*24 * These are the defined ARCnet Protocol ID's.25 */26 27/* CAP mode */28/* No macro but uses 1-8 */29 30/* RFC1201 Protocol ID's */31#define ARC_P_IP 212 /* 0xD4 */32#define ARC_P_IPV6 196 /* 0xC4: RFC2497 */33#define ARC_P_ARP 213 /* 0xD5 */34#define ARC_P_RARP 214 /* 0xD6 */35#define ARC_P_IPX 250 /* 0xFA */36#define ARC_P_NOVELL_EC 236 /* 0xEC */37 38/* Old RFC1051 Protocol ID's */39#define ARC_P_IP_RFC1051 240 /* 0xF0 */40#define ARC_P_ARP_RFC1051 241 /* 0xF1 */41 42/* MS LanMan/WfWg "NDIS" encapsulation */43#define ARC_P_ETHER 232 /* 0xE8 */44 45/* Unsupported/indirectly supported protocols */46#define ARC_P_DATAPOINT_BOOT 0 /* very old Datapoint equipment */47#define ARC_P_DATAPOINT_MOUNT 148#define ARC_P_POWERLAN_BEACON 8 /* Probably ATA-Netbios related */49#define ARC_P_POWERLAN_BEACON2 243 /* 0xF3 */50#define ARC_P_LANSOFT 251 /* 0xFB - what is this? */51#define ARC_P_ATALK 0xDD52 53/* Hardware address length */54#define ARCNET_ALEN 155 56/*57 * The RFC1201-specific components of an arcnet packet header.58 */59struct arc_rfc1201 {60 __u8 proto; /* protocol ID field - varies */61 __u8 split_flag; /* for use with split packets */62 __be16 sequence; /* sequence number */63 __u8 payload[]; /* space remaining in packet (504 bytes)*/64};65#define RFC1201_HDR_SIZE 466 67/*68 * The RFC1051-specific components.69 */70struct arc_rfc1051 {71 __u8 proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */72 __u8 payload[]; /* 507 bytes */73};74#define RFC1051_HDR_SIZE 175 76/*77 * The ethernet-encap-specific components. We have a real ethernet header78 * and some data.79 */80struct arc_eth_encap {81 __u8 proto; /* Always ARC_P_ETHER */82 struct ethhdr eth; /* standard ethernet header (yuck!) */83 __u8 payload[]; /* 493 bytes */84};85#define ETH_ENCAP_HDR_SIZE 1486 87struct arc_cap {88 __u8 proto;89 __u8 cookie[sizeof(int)];90 /* Actually NOT sent over the network */91 union {92 __u8 ack;93 __u8 raw[0]; /* 507 bytes */94 } mes;95};96 97/*98 * The data needed by the actual arcnet hardware.99 *100 * Now, in the real arcnet hardware, the third and fourth bytes are the101 * 'offset' specification instead of the length, and the soft data is at102 * the _end_ of the 512-byte buffer. We hide this complexity inside the103 * driver.104 */105struct arc_hardware {106 __u8 source; /* source ARCnet - filled in automagically */107 __u8 dest; /* destination ARCnet - 0 for broadcast */108 __u8 offset[2]; /* offset bytes (some weird semantics) */109};110#define ARC_HDR_SIZE 4111 112/*113 * This is an ARCnet frame header, as seen by the kernel (and userspace,114 * when you do a raw packet capture).115 */116struct archdr {117 /* hardware requirements */118 struct arc_hardware hard;119 120 /* arcnet encapsulation-specific bits */121 union {122 struct arc_rfc1201 rfc1201;123 struct arc_rfc1051 rfc1051;124 struct arc_eth_encap eth_encap;125 struct arc_cap cap;126 __u8 raw[0]; /* 508 bytes */127 } soft;128};129 130#endif /* _LINUX_IF_ARCNET_H */131