contrib/tcpdump/print-sunatm.c

   1 /*
   2  * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
   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, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Yen Yen Lim and
  16         North Dakota State University
  17  * 4. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  23  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  24  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  26  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  28  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  29  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 /* \summary: SunATM DLPI capture printer */
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <netdissect-stdinc.h>
  40
  41 struct mbuf;
  42 struct rtentry;
  43
  44 #include "netdissect.h"
  45 #include "extract.h"
  46
  47 #include "atm.h"
  48
  49 /* SunATM header for ATM packet */
  50 #define DIR_POS         0       /* Direction (0x80 = transmit, 0x00 = receive) */
  51 #define VPI_POS         1       /* VPI */
  52 #define VCI_POS         2       /* VCI */
  53 #define PKT_BEGIN_POS   4       /* Start of the ATM packet */
  54
  55 /* Protocol type values in the bottom for bits of the byte at SUNATM_DIR_POS. */
  56 #define PT_LANE         0x01    /* LANE */
  57 #define PT_LLC          0x02    /* LLC encapsulation */
  58
  59 /*
  60  * This is the top level routine of the printer.  'p' points
  61  * to the SunATM pseudo-header for the packet, 'h->ts' is the timestamp,
  62  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  63  * is the number of bytes actually captured.
  64  */
  65 u_int
  66 sunatm_if_print(netdissect_options *ndo,
  67                 const struct pcap_pkthdr *h, const u_char *p)
  68 {
  69         u_int caplen = h->caplen;
  70         u_int length = h->len;
  71         u_short vci;
  72         u_char vpi;
  73         u_int traftype;
  74
  75         if (caplen < PKT_BEGIN_POS) {
  76                 ND_PRINT((ndo, "[|atm]"));
  77                 return (caplen);
  78         }
  79
  80         if (ndo->ndo_eflag) {
  81                 ND_PRINT((ndo, p[DIR_POS] & 0x80 ? "Tx: " : "Rx: "));
  82         }
  83
  84         switch (p[DIR_POS] & 0x0f) {
  85
  86         case PT_LANE:
  87                 traftype = ATM_LANE;
  88                 break;
  89
  90         case PT_LLC:
  91                 traftype = ATM_LLC;
  92                 break;
  93
  94         default:
  95                 traftype = ATM_UNKNOWN;
  96                 break;
  97         }
  98
  99         vci = EXTRACT_16BITS(&p[VCI_POS]);
 100         vpi = p[VPI_POS];
 101
 102         p += PKT_BEGIN_POS;
 103         caplen -= PKT_BEGIN_POS;
 104         length -= PKT_BEGIN_POS;
 105         atm_print(ndo, vpi, vci, traftype, p, length, caplen);
 106
 107         return (PKT_BEGIN_POS);
 108 }