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 1.31 2002-12-18 08:53:19 guy 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 #include "llc.h"
  43
  44 #include "ether.h"
  45
  46 /*
  47  * Print an RFC 1483 LLC-encapsulated ATM frame.
  48  */
  49 static void
  50 atm_llc_print(const u_char *p, int length, int caplen)
  51 {
  52         u_short extracted_ethertype;
  53
  54         if (!llc_print(p, length, caplen, NULL, NULL,
  55             &extracted_ethertype)) {
  56                 /* ether_type not known, print raw packet */
  57                 if (extracted_ethertype) {
  58                         printf("(LLC %s) ",
  59                 etherproto_string(htons(extracted_ethertype)));
  60                 }
  61                 if (!xflag && !qflag)
  62                         default_print(p, caplen);
  63         }
  64 }
  65
  66 /*
  67  * Given a SAP value, generate the LLC header value for a UI packet
  68  * with that SAP as the source and destination SAP.
  69  */
  70 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
  71
  72 /*
  73  * This is the top level routine of the printer.  'p' points
  74  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
  75  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
  76  * is the number of bytes actually captured.
  77  */
  78 void
  79 atm_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
  80 {
  81         u_int caplen = h->caplen;
  82         u_int length = h->len;
  83         u_int32_t llchdr;
  84
  85         ++infodelay;
  86         ts_print(&h->ts);
  87
  88         if (caplen < 8) {
  89                 printf("[|atm]");
  90                 goto out;
  91         }
  92
  93         /*
  94          * Some printers want to check that they're not walking off the
  95          * end of the packet.
  96          * Rather than pass it all the way down, we set this global.
  97          */
  98         snapend = p + caplen;
  99
 100         /*
 101          * Extract the presumed LLC header into a variable, for quick
 102          * testing.
 103          * Then check for a header that's neither a header for a SNAP
 104          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 105          * an 802.2-but-no-SNAP IP packet.
 106          */
 107         llchdr = EXTRACT_24BITS(p);
 108         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 109             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 110             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 111                 /*
 112                  * XXX - assume 802.6 MAC header from Fore driver.
 113                  *
 114                  * Unfortunately, the above list doesn't check for
 115                  * all known SAPs, doesn't check for headers where
 116                  * the source and destination SAP aren't the same,
 117                  * and doesn't check for non-UI frames.  It also
 118                  * runs the risk of an 802.6 MAC header that happens
 119                  * to begin with one of those values being
 120                  * incorrectly treated as an 802.2 header.
 121                  *
 122                  * So is that Fore driver still around?  And, if so,
 123                  * is it still putting 802.6 MAC headers on ATM
 124                  * packets?  If so, could it be changed to use a
 125                  * new DLT_IEEE802_6 value if we added it?
 126                  */
 127                 if (eflag)
 128                         printf("%08x%08x %08x%08x ",
 129                                EXTRACT_32BITS(p),
 130                                EXTRACT_32BITS(p+4),
 131                                EXTRACT_32BITS(p+8),
 132                                EXTRACT_32BITS(p+12));
 133                 p += 20;
 134                 length -= 20;
 135                 caplen -= 20;
 136         }
 137         atm_llc_print(p, length, caplen);
 138         if (xflag)
 139                 default_print(p, caplen);
 140  out:
 141         putchar('\n');
 142 }
 143
 144 /*
 145  * ATM signalling.
 146  */
 147 static struct tok msgtype2str[] = {
 148         { CALL_PROCEED,         "Call_proceeding" },
 149         { CONNECT,              "Connect" },
 150         { CONNECT_ACK,          "Connect_ack" },
 151         { SETUP,                "Setup" },
 152         { RELEASE,              "Release" },
 153         { RELEASE_DONE,         "Release_complete" },
 154         { RESTART,              "Restart" },
 155         { RESTART_ACK,          "Restart_ack" },
 156         { STATUS,               "Status" },
 157         { STATUS_ENQ,           "Status_enquiry" },
 158         { ADD_PARTY,            "Add_party" },
 159         { ADD_PARTY_ACK,        "Add_party_ack" },
 160         { ADD_PARTY_REJ,        "Add_party_reject" },
 161         { DROP_PARTY,           "Drop_party" },
 162         { DROP_PARTY_ACK,       "Drop_party_ack" },
 163         { 0,                    NULL }
 164 };
 165
 166 static void
 167 sig_print(const u_char *p, int caplen)
 168 {
 169         bpf_u_int32 call_ref;
 170
 171         if (caplen < PROTO_POS) {
 172                 printf("[|atm]");
 173                 return;
 174         }
 175         if (p[PROTO_POS] == Q2931) {
 176                 /*
 177                  * protocol:Q.2931 for User to Network Interface
 178                  * (UNI 3.1) signalling
 179                  */
 180                 printf("Q.2931");
 181                 if (caplen < MSG_TYPE_POS) {
 182                         printf(" [|atm]");
 183                         return;
 184                 }
 185                 printf(":%s ",
 186                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 187
 188                 if (caplen < CALL_REF_POS+3) {
 189                         printf("[|atm]");
 190                         return;
 191                 }
 192                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 193                 printf("CALL_REF:0x%06x", call_ref);
 194         } else {
 195                 /* SCCOP with some unknown protocol atop it */
 196                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 197         }
 198 }
 199
 200 /*
 201  * Print an ATM PDU (such as an AAL5 PDU).
 202  */
 203 void
 204 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 205     u_int caplen)
 206 {
 207         if (eflag)
 208                 printf("VPI:%u VCI:%u ", vpi, vci);
 209
 210         /*
 211          * Some printers want to check that they're not walking off the
 212          * end of the packet.
 213          * Rather than pass it all the way down, we set this global.
 214          */
 215         snapend = p + caplen;
 216
 217         if (vpi == 0) {
 218                 switch (vci) {
 219
 220                 case PPC:
 221                         sig_print(p, caplen);
 222                         goto out;
 223
 224                 case BCC:
 225                         printf("broadcast sig: ");
 226                         goto out;
 227
 228                 case OAMF4SC:
 229                         printf("oamF4(segment): ");
 230                         goto out;
 231
 232                 case OAMF4EC:
 233                         printf("oamF4(end): ");
 234                         goto out;
 235
 236                 case METAC:
 237                         printf("meta: ");
 238                         goto out;
 239
 240                 case ILMIC:
 241                         printf("ilmi: ");
 242                         snmp_print(p, length);
 243                         goto out;
 244                 }
 245         }
 246
 247         switch (traftype) {
 248
 249         case ATM_LLC:
 250         default:
 251                 /*
 252                  * Assumes traffic is LLC if unknown.
 253                  */
 254                 atm_llc_print(p, length, caplen);
 255                 break;
 256
 257         case ATM_LANE:
 258                 lane_print(p, length, caplen);
 259                 break;
 260         }
 261
 262 out:
 263         if (xflag)
 264                 default_print(p, caplen);
 265 }