1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * 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 Pennarun 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 #ifndef _LINUX_IF_ARCNET_H 18 #define _LINUX_IF_ARCNET_H 19 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 1 48 #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 0xDD 52 53 /* Hardware address length */ 54 #define ARCNET_ALEN 1 55 56 /* 57 * The RFC1201-specific components of an arcnet packet header. 58 */ 59 struct 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[0]; /* space remaining in packet (504 bytes)*/ 64 }; 65 #define RFC1201_HDR_SIZE 4 66 67 /* 68 * The RFC1051-specific components. 69 */ 70 struct arc_rfc1051 { 71 __u8 proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */ 72 __u8 payload[0]; /* 507 bytes */ 73 }; 74 #define RFC1051_HDR_SIZE 1 75 76 /* 77 * The ethernet-encap-specific components. We have a real ethernet header 78 * and some data. 79 */ 80 struct arc_eth_encap { 81 __u8 proto; /* Always ARC_P_ETHER */ 82 struct ethhdr eth; /* standard ethernet header (yuck!) */ 83 __u8 payload[0]; /* 493 bytes */ 84 }; 85 #define ETH_ENCAP_HDR_SIZE 14 86 87 struct 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 the 101 * 'offset' specification instead of the length, and the soft data is at 102 * the _end_ of the 512-byte buffer. We hide this complexity inside the 103 * driver. 104 */ 105 struct 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 4 111 112 /* 113 * This is an ARCnet frame header, as seen by the kernel (and userspace, 114 * when you do a raw packet capture). 115 */ 116 struct 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
