The Tcpdump Group git mirrors - tcpdump/blob - token.h

   1 /*
   2  * Copyright (c) 1998, Larry Lile
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  */
  28
  29 #define TOKEN_HDRLEN            14
  30 #define TOKEN_RING_MAC_LEN      6
  31 #define ROUTING_SEGMENT_MAX     16
  32 #define IS_SOURCE_ROUTED(trp)   ((trp)->token_shost[0] & 0x80)
  33 #define FRAME_TYPE(trp)         (((trp)->token_fc & 0xC0) >> 6)
  34 #define TOKEN_FC_LLC            1
  35
  36 #define BROADCAST(trp)          ((ntohs((trp)->token_rcf) & 0xE000) >> 13)
  37 #define RIF_LENGTH(trp)         ((ntohs((trp)->token_rcf) & 0x1f00) >> 8)
  38 #define DIRECTION(trp)          ((ntohs((trp)->token_rcf) & 0x0080) >> 7)
  39 #define LARGEST_FRAME(trp)      ((ntohs((trp)->token_rcf) & 0x0070) >> 4)
  40 #define RING_NUMBER(trp, x)     ((ntohs((trp)->token_rseg[x]) & 0xfff0) >> 4)
  41 #define BRIDGE_NUMBER(trp, x)   ((ntohs((trp)->token_rseg[x]) & 0x000f))
  42 #define SEGMENT_COUNT(trp)      ((RIF_LENGTH(trp) - 2) / 2)
  43
  44 struct token_header {
  45         u_char  token_ac;
  46         u_char  token_fc;
  47         u_char  token_dhost[TOKEN_RING_MAC_LEN];
  48         u_char  token_shost[TOKEN_RING_MAC_LEN];
  49         u_short token_rcf;
  50         u_short token_rseg[ROUTING_SEGMENT_MAX];
  51 };