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 /* RFC1201 Protocol ID's */ 27 #define ARC_P_IP 212 /* 0xD4 */ 28 #define ARC_P_IPV6 196 /* 0xC4: RFC2497 */ 29 #define ARC_P_ARP 213 /* 0xD5 */ 30 #define ARC_P_RARP 214 /* 0xD6 */ 31 #define ARC_P_IPX 250 /* 0xFA */ 32 #define ARC_P_NOVELL_EC 236 /* 0xEC */ 33 34 /* Old RFC1051 Protocol ID's */ 35 #define ARC_P_IP_RFC1051 240 /* 0xF0 */ 36 #define ARC_P_ARP_RFC1051 241 /* 0xF1 */ 37 38 /* MS LanMan/WfWg "NDIS" encapsulation */ 39 #define ARC_P_ETHER 232 /* 0xE8 */ 40 41 /* Unsupported/indirectly supported protocols */ 42 #define ARC_P_DATAPOINT_BOOT 0 /* very old Datapoint equipment */ 43 #define ARC_P_DATAPOINT_MOUNT 1 44 #define ARC_P_POWERLAN_BEACON 8 /* Probably ATA-Netbios related */ 45 #define ARC_P_POWERLAN_BEACON2 243 /* 0xF3 */ 46 #define ARC_P_LANSOFT 251 /* 0xFB - what is this? */ 47 #define ARC_P_ATALK 0xDD 48 49 /* Hardware address length */ 50 #define ARCNET_ALEN 1 51 52 /* 53 * The RFC1201-specific components of an arcnet packet header. 54 */ 55 struct arc_rfc1201 56 { 57 uint8_t proto; /* protocol ID field - varies */ 58 uint8_t split_flag; /* for use with split packets */ 59 uint16_t sequence; /* sequence number */ 60 uint8_t payload[0]; /* space remaining in packet (504 bytes)*/ 61 }; 62 #define RFC1201_HDR_SIZE 4 63 64 65 /* 66 * The RFC1051-specific components. 67 */ 68 struct arc_rfc1051 69 { 70 uint8_t proto; /* ARC_P_RFC1051_ARP/RFC1051_IP */ 71 uint8_t payload[0]; /* 507 bytes */ 72 }; 73 #define RFC1051_HDR_SIZE 1 74 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 { 82 uint8_t proto; /* Always ARC_P_ETHER */ 83 struct ethhdr eth; /* standard ethernet header (yuck!) */ 84 uint8_t payload[0]; /* 493 bytes */ 85 }; 86 #define ETH_ENCAP_HDR_SIZE 14 87 88 89 /* 90 * The data needed by the actual arcnet hardware. 91 * 92 * Now, in the real arcnet hardware, the third and fourth bytes are the 93 * 'offset' specification instead of the length, and the soft data is at 94 * the _end_ of the 512-byte buffer. We hide this complexity inside the 95 * driver. 96 */ 97 struct arc_hardware 98 { 99 uint8_t source, /* source ARCnet - filled in automagically */ 100 dest, /* destination ARCnet - 0 for broadcast */ 101 offset[2]; /* offset bytes (some weird semantics) */ 102 }; 103 #define ARC_HDR_SIZE 4 104 105 /* 106 * This is an ARCnet frame header, as seen by the kernel (and userspace, 107 * when you do a raw packet capture). 108 */ 109 struct archdr 110 { 111 /* hardware requirements */ 112 struct arc_hardware hard; 113 114 /* arcnet encapsulation-specific bits */ 115 union { 116 struct arc_rfc1201 rfc1201; 117 struct arc_rfc1051 rfc1051; 118 struct arc_eth_encap eth_encap; 119 uint8_t raw[0]; /* 508 bytes */ 120 } soft; 121 }; 122 123 #endif /* _LINUX_IF_ARCNET_H */ 124