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 1.33 2002-12-19 09:39:11 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 u_int
  79 atm_if_print(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         u_int hdrlen = 0;
  85
  86         if (caplen < 8) {
  87                 printf("[|atm]");
  88                 return (caplen);
  89         }
  90
  91         /*
  92          * Extract the presumed LLC header into a variable, for quick
  93          * testing.
  94          * Then check for a header that's neither a header for a SNAP
  95          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
  96          * an 802.2-but-no-SNAP IP packet.
  97          */
  98         llchdr = EXTRACT_24BITS(p);
  99         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 100             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 101             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 102                 /*
 103                  * XXX - assume 802.6 MAC header from Fore driver.
 104                  *
 105                  * Unfortunately, the above list doesn't check for
 106                  * all known SAPs, doesn't check for headers where
 107                  * the source and destination SAP aren't the same,
 108                  * and doesn't check for non-UI frames.  It also
 109                  * runs the risk of an 802.6 MAC header that happens
 110                  * to begin with one of those values being
 111                  * incorrectly treated as an 802.2 header.
 112                  *
 113                  * So is that Fore driver still around?  And, if so,
 114                  * is it still putting 802.6 MAC headers on ATM
 115                  * packets?  If so, could it be changed to use a
 116                  * new DLT_IEEE802_6 value if we added it?
 117                  */
 118                 if (eflag)
 119                         printf("%08x%08x %08x%08x ",
 120                                EXTRACT_32BITS(p),
 121                                EXTRACT_32BITS(p+4),
 122                                EXTRACT_32BITS(p+8),
 123                                EXTRACT_32BITS(p+12));
 124                 p += 20;
 125                 length -= 20;
 126                 caplen -= 20;
 127                 hdrlen += 20;
 128         }
 129         atm_llc_print(p, length, caplen);
 130         return (hdrlen);
 131 }
 132
 133 /*
 134  * ATM signalling.
 135  */
 136 static struct tok msgtype2str[] = {
 137         { CALL_PROCEED,         "Call_proceeding" },
 138         { CONNECT,              "Connect" },
 139         { CONNECT_ACK,          "Connect_ack" },
 140         { SETUP,                "Setup" },
 141         { RELEASE,              "Release" },
 142         { RELEASE_DONE,         "Release_complete" },
 143         { RESTART,              "Restart" },
 144         { RESTART_ACK,          "Restart_ack" },
 145         { STATUS,               "Status" },
 146         { STATUS_ENQ,           "Status_enquiry" },
 147         { ADD_PARTY,            "Add_party" },
 148         { ADD_PARTY_ACK,        "Add_party_ack" },
 149         { ADD_PARTY_REJ,        "Add_party_reject" },
 150         { DROP_PARTY,           "Drop_party" },
 151         { DROP_PARTY_ACK,       "Drop_party_ack" },
 152         { 0,                    NULL }
 153 };
 154
 155 static void
 156 sig_print(const u_char *p, int caplen)
 157 {
 158         bpf_u_int32 call_ref;
 159
 160         if (caplen < PROTO_POS) {
 161                 printf("[|atm]");
 162                 return;
 163         }
 164         if (p[PROTO_POS] == Q2931) {
 165                 /*
 166                  * protocol:Q.2931 for User to Network Interface
 167                  * (UNI 3.1) signalling
 168                  */
 169                 printf("Q.2931");
 170                 if (caplen < MSG_TYPE_POS) {
 171                         printf(" [|atm]");
 172                         return;
 173                 }
 174                 printf(":%s ",
 175                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 176
 177                 if (caplen < CALL_REF_POS+3) {
 178                         printf("[|atm]");
 179                         return;
 180                 }
 181                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 182                 printf("CALL_REF:0x%06x", call_ref);
 183         } else {
 184                 /* SCCOP with some unknown protocol atop it */
 185                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 186         }
 187 }
 188
 189 /*
 190  * Print an ATM PDU (such as an AAL5 PDU).
 191  */
 192 void
 193 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 194     u_int caplen)
 195 {
 196         if (eflag)
 197                 printf("VPI:%u VCI:%u ", vpi, vci);
 198
 199         if (vpi == 0) {
 200                 switch (vci) {
 201
 202                 case PPC:
 203                         sig_print(p, caplen);
 204                         return;
 205
 206                 case BCC:
 207                         printf("broadcast sig: ");
 208                         return;
 209
 210                 case OAMF4SC:
 211                         printf("oamF4(segment): ");
 212                         return;
 213
 214                 case OAMF4EC:
 215                         printf("oamF4(end): ");
 216                         return;
 217
 218                 case METAC:
 219                         printf("meta: ");
 220                         return;
 221
 222                 case ILMIC:
 223                         printf("ilmi: ");
 224                         snmp_print(p, length);
 225                         return;
 226                 }
 227         }
 228
 229         switch (traftype) {
 230
 231         case ATM_LLC:
 232         default:
 233                 /*
 234                  * Assumes traffic is LLC if unknown.
 235                  */
 236                 atm_llc_print(p, length, caplen);
 237                 break;
 238
 239         case ATM_LANE:
 240                 lane_print(p, length, caplen);
 241                 break;
 242         }
 243 }