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 Token-Ring IEEE 802.5 interface.
7 *
8 * Version:	@(#)if_tr.h	0.0	07/11/94
9 *
10 * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 *		Donald Becker, <becker@super.org>
12 *		Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>
13 *
14 *		This program is free software; you can redistribute it and/or
15 *		modify it under the terms of the GNU General Public License
16 *		as published by the Free Software Foundation; either version
17 *		2 of the License, or (at your option) any later version.
18 */
19#ifndef _LINUX_IF_TR_H
20#define _LINUX_IF_TR_H
21
22#include <asm/byteorder.h>	/* For __be16 */
23
24/* IEEE 802.5 Token-Ring magic constants.  The frame sizes omit the preamble
25   and FCS/CRC (frame check sequence). */
26#define TR_ALEN		6		/* Octets in one token-ring addr */
27#define TR_HLEN 	(sizeof(struct trh_hdr)+sizeof(struct trllc))
28#define AC		0x10
29#define LLC_FRAME 	0x40
30
31/* LLC and SNAP constants */
32#define EXTENDED_SAP 	0xAA
33#define UI_CMD       	0x03
34
35/* This is an Token-Ring frame header. */
36struct trh_hdr {
37	__u8  ac;			/* access control field */
38	__u8  fc;			/* frame control field */
39	__u8  daddr[TR_ALEN];		/* destination address */
40	__u8  saddr[TR_ALEN];		/* source address */
41	__be16 rcf;			/* route control field */
42	__be16 rseg[8];			/* routing registers */
43};
44
45#ifdef __KERNEL__
46#include <linux/skbuff.h>
47
48static inline struct trh_hdr *tr_hdr(const struct sk_buff *skb)
49{
50	return (struct trh_hdr *)skb->mac.raw;
51}
52#ifdef CONFIG_SYSCTL
53extern struct ctl_table tr_table[];
54#endif
55#endif
56
57/* This is an Token-Ring LLC structure */
58struct trllc {
59	__u8  dsap;			/* destination SAP */
60	__u8  ssap;			/* source SAP */
61	__u8  llc;			/* LLC control field */
62	__u8  protid[3];		/* protocol id */
63	__be16 ethertype;		/* ether type field */
64};
65
66/* Token-Ring statistics collection data. */
67struct tr_statistics {
68	unsigned long rx_packets;       /* total packets received	*/
69	unsigned long tx_packets;	/* total packets transmitted	*/
70	unsigned long rx_bytes;		/* total bytes received   	*/
71	unsigned long tx_bytes;		/* total bytes transmitted	*/
72	unsigned long rx_errors;	/* bad packets received		*/
73	unsigned long tx_errors;	/* packet transmit problems	*/
74	unsigned long rx_dropped;	/* no space in linux buffers	*/
75	unsigned long tx_dropped;	/* no space available in linux	*/
76	unsigned long multicast;	/* multicast packets received	*/
77	unsigned long transmit_collision;
78
79	/* detailed Token-Ring errors. See IBM Token-Ring Network
80	   Architecture for more info */
81
82	unsigned long line_errors;
83	unsigned long internal_errors;
84	unsigned long burst_errors;
85	unsigned long A_C_errors;
86	unsigned long abort_delimiters;
87	unsigned long lost_frames;
88	unsigned long recv_congest_count;
89	unsigned long frame_copied_errors;
90	unsigned long frequency_errors;
91	unsigned long token_errors;
92	unsigned long dummy1;
93};
94
95/* source routing stuff */
96#define TR_RII 			0x80
97#define TR_RCF_DIR_BIT 		0x80
98#define TR_RCF_LEN_MASK 	0x1f00
99#define TR_RCF_BROADCAST 	0x8000	/* all-routes broadcast */
100#define TR_RCF_LIMITED_BROADCAST 0xC000	/* single-route broadcast */
101#define TR_RCF_FRAME2K 		0x20
102#define TR_RCF_BROADCAST_MASK 	0xC000
103#define TR_MAXRIFLEN 		18
104
105#endif	/* _LINUX_IF_TR_H */
106