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 __be16 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
