The Tcpdump Group git mirrors - tcpdump/blob - print-atm.c

   1 /*
   2  * Copyright (c) 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21 #ifndef lint
  22 static const char rcsid[] =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.27 2002-12-04 19:12:39 hannes Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33 #include <pcap.h>
  34 #include <string.h>
  35
  36 #include "interface.h"
  37 #include "extract.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40 #include "atm.h"
  41 #include "atmuni31.h"
  42
  43 #include "ether.h"
  44
  45 /*
  46  * This is the top level routine of the printer.  'p' points
  47  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
  48  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  49  * is the number of bytes actually captured.
  50  */
  51 void
  52 atm_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
  53 {
  54         u_int caplen = h->caplen;
  55         u_int length = h->len;
  56
  57         ++infodelay;
  58         ts_print(&h->ts);
  59
  60         if (caplen < 8) {
  61                 printf("[|atm]");
  62                 goto out;
  63         }
  64
  65         /*
  66          * Some printers want to check that they're not walking off the
  67          * end of the packet.
  68          * Rather than pass it all the way down, we set this global.
  69          */
  70         snapend = p + caplen;
  71
  72         if (EXTRACT_24BITS(p) == 0xaaaa03) {
  73                 /*
  74                  * XXX - assume 802.6 MAC header from Fore driver.
  75                  * XXX - should we also assume it's not a MAC header
  76                  * if it begins with 0xfe 0xfe 0x03, for RFC 2684
  77                  * routed NLPID-formatted PDUs?
  78                  */
  79                 if (eflag)
  80                         printf("%08x%08x %08x%08x ",
  81                                EXTRACT_32BITS(p),
  82                                EXTRACT_32BITS(p+4),
  83                                EXTRACT_32BITS(p+8),
  84                                EXTRACT_32BITS(p+12));
  85                 p += 20;
  86                 length -= 20;
  87                 caplen -= 20;
  88         }
  89
  90         /* lets call into the generic LLC handler */
  91         llc_print(p, length, caplen, NULL, NULL, NULL);
  92
  93         if (xflag)
  94                 default_print(p, caplen);
  95  out:
  96         putchar('\n');
  97 }
  98
  99 /*
 100  * ATM signalling.
 101  */
 102 static struct tok msgtype2str[] = {
 103         { CALL_PROCEED,         "Call_proceeding" },
 104         { CONNECT,              "Connect" },
 105         { CONNECT_ACK,          "Connect_ack" },
 106         { SETUP,                "Setup" },
 107         { RELEASE,              "Release" },
 108         { RELEASE_DONE,         "Release_complete" },
 109         { RESTART,              "Restart" },
 110         { RESTART_ACK,          "Restart_ack" },
 111         { STATUS,               "Status" },
 112         { STATUS_ENQ,           "Status_enquiry" },
 113         { ADD_PARTY,            "Add_party" },
 114         { ADD_PARTY_ACK,        "Add_party_ack" },
 115         { ADD_PARTY_REJ,        "Add_party_reject" },
 116         { DROP_PARTY,           "Drop_party" },
 117         { DROP_PARTY_ACK,       "Drop_party_ack" },
 118         { 0,                    NULL }
 119 };
 120
 121 static void
 122 sig_print(const u_char *p, int caplen)
 123 {
 124         bpf_u_int32 call_ref;
 125
 126         if (caplen < PROTO_POS) {
 127                 printf("[|atm]");
 128                 return;
 129         }
 130         if (p[PROTO_POS] == Q2931) {
 131                 /*
 132                  * protocol:Q.2931 for User to Network Interface
 133                  * (UNI 3.1) signalling
 134                  */
 135                 printf("Q.2931");
 136                 if (caplen < MSG_TYPE_POS) {
 137                         printf(" [|atm]");
 138                         return;
 139                 }
 140                 printf(":%s ",
 141                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 142
 143                 if (caplen < CALL_REF_POS+3) {
 144                         printf("[|atm]");
 145                         return;
 146                 }
 147                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 148                 printf("CALL_REF:0x%06x", call_ref);
 149         } else {
 150                 /* SCCOP with some unknown protocol atop it */
 151                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 152         }
 153 }
 154
 155 /*
 156  * Print an ATM PDU (such as an AAL5 PDU).
 157  */
 158 void
 159 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 160     u_int caplen)
 161 {
 162         if (eflag)
 163                 printf("VPI:%u VCI:%u ", vpi, vci);
 164
 165         /*
 166          * Some printers want to check that they're not walking off the
 167          * end of the packet.
 168          * Rather than pass it all the way down, we set this global.
 169          */
 170         snapend = p + caplen;
 171
 172         if (vpi == 0) {
 173                 switch (vci) {
 174
 175                 case PPC:
 176                         sig_print(p, caplen);
 177                         goto out;
 178
 179                 case BCC:
 180                         printf("broadcast sig: ");
 181                         goto out;
 182
 183                 case OAMF4SC:
 184                         printf("oamF4(segment): ");
 185                         goto out;
 186
 187                 case OAMF4EC:
 188                         printf("oamF4(end): ");
 189                         goto out;
 190
 191                 case METAC:
 192                         printf("meta: ");
 193                         goto out;
 194
 195                 case ILMIC:
 196                         printf("ilmi: ");
 197                         snmp_print(p, length);
 198                         goto out;
 199                 }
 200         }
 201
 202         switch (traftype) {
 203
 204         case ATM_LLC:
 205         default:
 206                 /*
 207                  * Assumes traffic is LLC if unknown.
 208                  * call into the generic LLC handler
 209                  */
 210                 llc_print(p, length, caplen, NULL, NULL, NULL);
 211                 break;
 212
 213         case ATM_LANE:
 214                 lane_print(p, length, caplen);
 215                 break;
 216         }
 217
 218 out:
 219         if (xflag)
 220                 default_print(p, caplen);
 221 }