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[]; /* 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[]; /* 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[]; /* 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 | |