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/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET is implemented using the  BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              Global definitions for the Token-Ring IEEE 802.5 interface.

 *

 * Version:     @(#)if_tr.h     0.0     07/11/94

 *

 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

 *              Donald Becker, <becker@super.org>

 *              Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 */

#ifndef _LINUX_IF_TR_H

#define _LINUX_IF_TR_H

#include <asm/byteorder.h>      /* For __be16 */

/* IEEE 802.5 Token-Ring magic constants.  The frame sizes omit the preamble

   and FCS/CRC (frame check sequence). */

#define TR_ALEN         6               /* Octets in one token-ring addr */

#define TR_HLEN         (sizeof(struct trh_hdr)+sizeof(struct trllc))

#define AC              0x10

#define LLC_FRAME       0x40

/* LLC and SNAP constants */

#define EXTENDED_SAP    0xAA

#define UI_CMD          0x03

/* This is an Token-Ring frame header. */

struct trh_hdr {

        __u8  ac;                       /* access control field */

        __u8  fc;                       /* frame control field */

        __u8  daddr[TR_ALEN];           /* destination address */

        __u8  saddr[TR_ALEN];           /* source address */

        __be16 rcf;                     /* route control field */

        __be16 rseg[8];                 /* routing registers */

};

#ifdef __KERNEL__

#include <linux/skbuff.h>

static inline struct trh_hdr *tr_hdr(const struct sk_buff *skb)

{

        return (struct trh_hdr *)skb_mac_header(skb);

}

#ifdef CONFIG_SYSCTL

extern struct ctl_table tr_table[];

#endif

#endif

/* This is an Token-Ring LLC structure */

struct trllc {

        __u8  dsap;                     /* destination SAP */

        __u8  ssap;                     /* source SAP */

        __u8  llc;                      /* LLC control field */

        __u8  protid[3];                /* protocol id */

        __be16 ethertype;               /* ether type field */

};

/* Token-Ring statistics collection data. */

struct tr_statistics {

        unsigned long rx_packets;       /* total packets received       */

        unsigned long tx_packets;       /* total packets transmitted    */

        unsigned long rx_bytes;         /* total bytes received         */

        unsigned long tx_bytes;         /* total bytes transmitted      */

        unsigned long rx_errors;        /* bad packets received         */

        unsigned long tx_errors;        /* packet transmit problems     */

        unsigned long rx_dropped;       /* no space in linux buffers    */

        unsigned long tx_dropped;       /* no space available in linux  */

        unsigned long multicast;        /* multicast packets received   */

        unsigned long transmit_collision;

        /* detailed Token-Ring errors. See IBM Token-Ring Network

           Architecture for more info */

        unsigned long line_errors;

        unsigned long internal_errors;

        unsigned long burst_errors;

        unsigned long A_C_errors;

        unsigned long abort_delimiters;

        unsigned long lost_frames;

        unsigned long recv_congest_count;

        unsigned long frame_copied_errors;

        unsigned long frequency_errors;

        unsigned long token_errors;

        unsigned long dummy1;

};

/* source routing stuff */

#define TR_RII                  0x80

#define TR_RCF_DIR_BIT          0x80

#define TR_RCF_LEN_MASK         0x1f00

#define TR_RCF_BROADCAST        0x8000  /* all-routes broadcast */

#define TR_RCF_LIMITED_BROADCAST 0xC000 /* single-route broadcast */

#define TR_RCF_FRAME2K          0x20

#define TR_RCF_BROADCAST_MASK   0xC000

#define TR_MAXRIFLEN            18

#endif  /* _LINUX_IF_TR_H */