_atm.c

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/* 
 * Copyright (c) 1994, 1995, 1996
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <stdio.h>
#include <time.h>
#include <sys/param.h>
#include <sys/socket.h>

#include "a2name.h"
#include "ethertyp.h"
#include "interfac.h"

/* 
 * This is the top level routine of the printer.  'p' is the points
 * to the LLC/SNAP header of the packet, 'tvp' is the timestamp,
 * 'length' is the length of the packet off the wire, and 'caplen'
 * is the number of bytes actually captured.
 */
void atm_if_print (u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
  static  u_int32_t num_pkt = 0;
  u_int   caplen = h->caplen;
  u_int   length = h->len;
  u_short ethertype;

  ts_print (&h->ts);

  if (caplen < 8)
  {
    PUTS ("[|atm]");
    goto out;
  }
  if (p[0] != 0xaa || p[1] != 0xaa || p[2] != 0x03)
  {
    /*XXX assume 802.6 MAC header from fore driver */
    if (eflag)
       PRINTF ("%04x%04x %04x%04x ",
               p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3],
               p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7],
               p[8] << 24 | p[9] << 16 | p[10] << 8 | p[11],
               p[12] << 24 | p[13] << 16 | p[14] << 8 | p[15]);
    p      += 20;
    length -= 20;
    caplen -= 20;
  }
  ethertype = p[6] << 8 | p[7];
  if (eflag)
     PRINTF ("%02x %02x %02x %02x-%02x-%02x %04x: ",
             p[0], p[1], p[2],   /* dsap/ssap/ctrl */
             p[3], p[4], p[5],   /* manufacturer's code */
             ethertype);

  /*
   * Some printers want to get back at the ethernet addresses,
   * and/or check that they're not walking off the end of the packet.
   * Rather than pass them all the way down, we set these globals.
   */
  packetp = p;
  snapend = p + caplen;

  length -= 8;
  caplen -= 8;
  p += 8;

  switch (ethertype)
  {
    case ETHERTYPE_IP:
         ip_print (p, length);
         break;

#ifdef USE_INET6
    case ETHERTYPE_IPV6:
         ip6_print (p, length);
         break;
#endif
         /*XXX this probably isn't right */
    case ETHERTYPE_ARP:
    case ETHERTYPE_REVARP:
         arp_print (p, length, caplen);
         break;

#ifdef notyet
    case ETHERTYPE_DN:
         decnet_print (p, length, caplen);
         break;

    case ETHERTYPE_ATALK:
         if (vflag)
            PUTS ("et1 ");
         atalk_print (p, length);
         break;

    case ETHERTYPE_AARP:
         aarp_print (p, length);
         break;

    case ETHERTYPE_LAT:
    case ETHERTYPE_MOPRC:
    case ETHERTYPE_MOPDL:
#endif

    default:
         if (!eflag)
            PRINTF ("%02x %02x %02x %02x-%02x-%02x %04x: ",
                    p[0], p[1], p[2],    /* dsap/ssap/ctrl */
                    p[3], p[4], p[5],    /* manufacturer's code */
                    ethertype);
         if (!xflag && !qflag)
            default_print (p, caplen);
     }
  if (xflag)
     default_print (p, caplen);

out:
  PUTS ("\n");
  status_write ("ATM: %lu (%lu)", ++num_pkt, pcap_mac_packets());
}