The Tcpdump Group git mirrors - tcpdump/blob - 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 #ifdef HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36
  37 #include <tcpdump-stdinc.h>
  38
  39 struct mbuf;
  40 struct rtentry;
  41
  42 #include <stdio.h>
  43 #include <pcap.h>
  44
  45 #include "interface.h"
  46 #include "extract.h"
  47 #include "addrtoname.h"
  48
  49 #include "atm.h"
  50 #include "atmuni31.h"
  51
  52 /* SunATM header for ATM packet */
  53 #define DIR_POS         0       /* Direction (0x80 = transmit, 0x00 = receive) */
  54 #define VPI_POS         1       /* VPI */
  55 #define VCI_POS         2       /* VCI */
  56 #define PKT_BEGIN_POS   4       /* Start of the ATM packet */
  57
  58 /* Protocol type values in the bottom for bits of the byte at SUNATM_DIR_POS. */
  59 #define PT_LANE         0x01    /* LANE */
  60 #define PT_LLC          0x02    /* LLC encapsulation */
  61
  62 /*
  63  * This is the top level routine of the printer.  'p' points
  64  * to the SunATM pseudo-header for the packet, 'h->ts' is the timestamp,
  65  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  66  * is the number of bytes actually captured.
  67  */
  68 u_int
  69 sunatm_if_print(const struct pcap_pkthdr *h, const u_char *p)
  70 {
  71         u_int caplen = h->caplen;
  72         u_int length = h->len;
  73         u_short vci;
  74         u_char vpi;
  75         u_int traftype;
  76
  77         if (caplen < PKT_BEGIN_POS) {
  78                 printf("[|atm]");
  79                 return (caplen);
  80         }
  81
  82         if (eflag) {
  83                 if (p[DIR_POS] & 0x80)
  84                         printf("Tx: ");
  85                 else
  86                         printf("Rx: ");
  87         }
  88
  89         switch (p[DIR_POS] & 0x0f) {
  90
  91         case PT_LANE:
  92                 traftype = ATM_LANE;
  93                 break;
  94
  95         case PT_LLC:
  96                 traftype = ATM_LLC;
  97                 break;
  98
  99         default:
 100                 traftype = ATM_UNKNOWN;
 101                 break;
 102         }
 103
 104         vci = EXTRACT_16BITS(&p[VCI_POS]);
 105         vpi = p[VPI_POS];
 106
 107         p += PKT_BEGIN_POS;
 108         caplen -= PKT_BEGIN_POS;
 109         length -= PKT_BEGIN_POS;
 110         atm_print(vpi, vci, traftype, p, length, caplen);
 111
 112         return (PKT_BEGIN_POS);
 113 }