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print-atm.c

/*
 * Copyright (c) 1994, 1995, 1996, 1997
 *    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.
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.33.2.2 2003/11/16 08:51:11 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <pcap.h>
#include <string.h>

#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "atm.h"
#include "atmuni31.h"
#include "llc.h"

#include "ether.h"

/*
 * Print an RFC 1483 LLC-encapsulated ATM frame.
 */
static void
atm_llc_print(const u_char *p, int length, int caplen)
{
      u_short extracted_ethertype;

      if (!llc_print(p, length, caplen, NULL, NULL,
          &extracted_ethertype)) {
            /* ether_type not known, print raw packet */
            if (extracted_ethertype) {
                  printf("(LLC %s) ",
            etherproto_string(htons(extracted_ethertype)));
            }
            if (!xflag && !qflag)
                  default_print(p, caplen);
      }
}

/*
 * Given a SAP value, generate the LLC header value for a UI packet
 * with that SAP as the source and destination SAP.
 */
#define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)

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

      if (caplen < 8) {
            printf("[|atm]");
            return (caplen);
      }

      /*
       * Extract the presumed LLC header into a variable, for quick
       * testing.
       * Then check for a header that's neither a header for a SNAP
       * packet nor an RFC 2684 routed NLPID-formatted PDU nor
       * an 802.2-but-no-SNAP IP packet.
       */
      llchdr = EXTRACT_24BITS(p);
      if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
          llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
          llchdr != LLC_UI_HDR(LLCSAP_IP)) {
            /*
             * XXX - assume 802.6 MAC header from Fore driver.
             *
             * Unfortunately, the above list doesn't check for
             * all known SAPs, doesn't check for headers where
             * the source and destination SAP aren't the same,
             * and doesn't check for non-UI frames.  It also
             * runs the risk of an 802.6 MAC header that happens
             * to begin with one of those values being
             * incorrectly treated as an 802.2 header.
             *
             * So is that Fore driver still around?  And, if so,
             * is it still putting 802.6 MAC headers on ATM
             * packets?  If so, could it be changed to use a
             * new DLT_IEEE802_6 value if we added it?
             */
            if (eflag)
                  printf("%08x%08x %08x%08x ",
                         EXTRACT_32BITS(p),
                         EXTRACT_32BITS(p+4),
                         EXTRACT_32BITS(p+8),
                         EXTRACT_32BITS(p+12));
            p += 20;
            length -= 20;
            caplen -= 20;
            hdrlen += 20;
      }
      atm_llc_print(p, length, caplen);
      return (hdrlen);
}

/*
 * ATM signalling.
 */
static struct tok msgtype2str[] = {
      { CALL_PROCEED,         "Call_proceeding" },
      { CONNECT,        "Connect" },
      { CONNECT_ACK,          "Connect_ack" },
      { SETUP,          "Setup" },
      { RELEASE,        "Release" },
      { RELEASE_DONE,         "Release_complete" },
      { RESTART,        "Restart" },
      { RESTART_ACK,          "Restart_ack" },
      { STATUS,         "Status" },
      { STATUS_ENQ,           "Status_enquiry" },
      { ADD_PARTY,            "Add_party" },
      { ADD_PARTY_ACK,  "Add_party_ack" },
      { ADD_PARTY_REJ,  "Add_party_reject" },
      { DROP_PARTY,           "Drop_party" },
      { DROP_PARTY_ACK, "Drop_party_ack" },
      { 0,              NULL }
};

static void
sig_print(const u_char *p, int caplen)
{
      bpf_u_int32 call_ref;

      if (caplen < PROTO_POS) {
            printf("[|atm]");
            return;
      }
      if (p[PROTO_POS] == Q2931) {
            /*
             * protocol:Q.2931 for User to Network Interface 
             * (UNI 3.1) signalling
             */
            printf("Q.2931");
            if (caplen < MSG_TYPE_POS) {
                  printf(" [|atm]");
                  return;
            }
            printf(":%s ",
                tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));

            if (caplen < CALL_REF_POS+3) {
                  printf("[|atm]");
                  return;
            }
            call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
            printf("CALL_REF:0x%06x", call_ref);
      } else {
            /* SCCOP with some unknown protocol atop it */
            printf("SSCOP, proto %d ", p[PROTO_POS]);
      }
}

/*
 * Print an ATM PDU (such as an AAL5 PDU).
 */
void
atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
    u_int caplen)
{
      if (eflag)
            printf("VPI:%u VCI:%u ", vpi, vci);

      if (vpi == 0) {
            switch (vci) {

            case PPC:
                  sig_print(p, caplen);
                  return;

            case BCC:
                  printf("broadcast sig: ");
                  return;

            case OAMF4SC:
                  printf("oamF4(segment): ");
                  return;

            case OAMF4EC:
                  printf("oamF4(end): ");
                  return;

            case METAC:
                  printf("meta: ");
                  return;

            case ILMIC:
                  printf("ilmi: ");
                  snmp_print(p, length);
                  return;
            }
      }

      switch (traftype) {

      case ATM_LLC:
      default:
            /*
             * Assumes traffic is LLC if unknown.
             */
            atm_llc_print(p, length, caplen);
            break;

      case ATM_LANE:
            lane_print(p, length, caplen);
            break;
      }
}

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