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root/include/linux/if_tr.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. tr_hdr

/*
 * 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);
}
#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 */

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