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[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.38 2005-01-19 16:46:27 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 #include "llc.h"
  43
  44 #include "ether.h"
  45
  46 struct tok oam_celltype_values[] = {
  47     { 0x1, "Fault Management" },
  48     { 0x2, "Performance Management" },
  49     { 0x8, "activate/deactivate" },
  50     { 0xf, "System Management" },
  51     { 0, NULL }
  52 };
  53
  54 struct tok oam_fm_functype_values[] = {
  55     { 0x0, "AIS" },
  56     { 0x1, "RDI" },
  57     { 0x4, "Continuity Check" },
  58     { 0x8, "Loopback" },
  59     { 0, NULL }
  60 };
  61
  62 struct tok oam_pm_functype_values[] = {
  63     { 0x0, "Forward Monitoring" },
  64     { 0x1, "Backward Reporting" },
  65     { 0x2, "Monitoring and Reporting" },
  66     { 0, NULL }
  67 };
  68
  69 struct tok oam_ad_functype_values[] = {
  70     { 0x0, "Performance Monitoring" },
  71     { 0x1, "Continuity Check" },
  72     { 0, NULL }
  73 };
  74
  75 static const struct tok *oam_functype_values[16] = {
  76     NULL,
  77     oam_fm_functype_values, /* 1 */
  78     oam_pm_functype_values, /* 2 */
  79     NULL,
  80     NULL,
  81     NULL,
  82     NULL,
  83     NULL,
  84     oam_ad_functype_values, /* 8 */
  85     NULL,
  86     NULL,
  87     NULL,
  88     NULL,
  89     NULL,
  90     NULL,
  91     NULL
  92 };
  93
  94 /*
  95  * Print an RFC 1483 LLC-encapsulated ATM frame.
  96  */
  97 static void
  98 atm_llc_print(const u_char *p, int length, int caplen)
  99 {
 100         u_short extracted_ethertype;
 101
 102         if (!llc_print(p, length, caplen, NULL, NULL,
 103             &extracted_ethertype)) {
 104                 /* ether_type not known, print raw packet */
 105                 if (extracted_ethertype) {
 106                         printf("(LLC %s) ",
 107                 etherproto_string(htons(extracted_ethertype)));
 108                 }
 109                 if (!xflag && !qflag)
 110                         default_print(p, caplen);
 111         }
 112 }
 113
 114 /*
 115  * Given a SAP value, generate the LLC header value for a UI packet
 116  * with that SAP as the source and destination SAP.
 117  */
 118 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 119
 120 /*
 121  * This is the top level routine of the printer.  'p' points
 122  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 123  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 124  * is the number of bytes actually captured.
 125  */
 126 u_int
 127 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
 128 {
 129         u_int caplen = h->caplen;
 130         u_int length = h->len;
 131         u_int32_t llchdr;
 132         u_int hdrlen = 0;
 133
 134         if (caplen < 8) {
 135                 printf("[|atm]");
 136                 return (caplen);
 137         }
 138
 139         /*
 140          * Extract the presumed LLC header into a variable, for quick
 141          * testing.
 142          * Then check for a header that's neither a header for a SNAP
 143          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 144          * an 802.2-but-no-SNAP IP packet.
 145          */
 146         llchdr = EXTRACT_24BITS(p);
 147         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 148             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 149             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 150                 /*
 151                  * XXX - assume 802.6 MAC header from Fore driver.
 152                  *
 153                  * Unfortunately, the above list doesn't check for
 154                  * all known SAPs, doesn't check for headers where
 155                  * the source and destination SAP aren't the same,
 156                  * and doesn't check for non-UI frames.  It also
 157                  * runs the risk of an 802.6 MAC header that happens
 158                  * to begin with one of those values being
 159                  * incorrectly treated as an 802.2 header.
 160                  *
 161                  * So is that Fore driver still around?  And, if so,
 162                  * is it still putting 802.6 MAC headers on ATM
 163                  * packets?  If so, could it be changed to use a
 164                  * new DLT_IEEE802_6 value if we added it?
 165                  */
 166                 if (eflag)
 167                         printf("%08x%08x %08x%08x ",
 168                                EXTRACT_32BITS(p),
 169                                EXTRACT_32BITS(p+4),
 170                                EXTRACT_32BITS(p+8),
 171                                EXTRACT_32BITS(p+12));
 172                 p += 20;
 173                 length -= 20;
 174                 caplen -= 20;
 175                 hdrlen += 20;
 176         }
 177         atm_llc_print(p, length, caplen);
 178         return (hdrlen);
 179 }
 180
 181 /*
 182  * ATM signalling.
 183  */
 184 static struct tok msgtype2str[] = {
 185         { CALL_PROCEED,         "Call_proceeding" },
 186         { CONNECT,              "Connect" },
 187         { CONNECT_ACK,          "Connect_ack" },
 188         { SETUP,                "Setup" },
 189         { RELEASE,              "Release" },
 190         { RELEASE_DONE,         "Release_complete" },
 191         { RESTART,              "Restart" },
 192         { RESTART_ACK,          "Restart_ack" },
 193         { STATUS,               "Status" },
 194         { STATUS_ENQ,           "Status_enquiry" },
 195         { ADD_PARTY,            "Add_party" },
 196         { ADD_PARTY_ACK,        "Add_party_ack" },
 197         { ADD_PARTY_REJ,        "Add_party_reject" },
 198         { DROP_PARTY,           "Drop_party" },
 199         { DROP_PARTY_ACK,       "Drop_party_ack" },
 200         { 0,                    NULL }
 201 };
 202
 203 static void
 204 sig_print(const u_char *p, int caplen)
 205 {
 206         bpf_u_int32 call_ref;
 207
 208         if (caplen < PROTO_POS) {
 209                 printf("[|atm]");
 210                 return;
 211         }
 212         if (p[PROTO_POS] == Q2931) {
 213                 /*
 214                  * protocol:Q.2931 for User to Network Interface
 215                  * (UNI 3.1) signalling
 216                  */
 217                 printf("Q.2931");
 218                 if (caplen < MSG_TYPE_POS) {
 219                         printf(" [|atm]");
 220                         return;
 221                 }
 222                 printf(":%s ",
 223                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 224
 225                 if (caplen < CALL_REF_POS+3) {
 226                         printf("[|atm]");
 227                         return;
 228                 }
 229                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 230                 printf("CALL_REF:0x%06x", call_ref);
 231         } else {
 232                 /* SCCOP with some unknown protocol atop it */
 233                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 234         }
 235 }
 236
 237 /*
 238  * Print an ATM PDU (such as an AAL5 PDU).
 239  */
 240 void
 241 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 242     u_int caplen)
 243 {
 244         if (eflag)
 245                 printf("VPI:%u VCI:%u ", vpi, vci);
 246
 247         if (vpi == 0) {
 248                 switch (vci) {
 249
 250                 case PPC:
 251                         sig_print(p, caplen);
 252                         return;
 253
 254                 case BCC:
 255                         printf("broadcast sig: ");
 256                         return;
 257
 258                 case OAMF4SC: /* fall through */
 259                 case OAMF4EC:
 260                         oam_print(p, length);
 261                         return;
 262
 263                 case METAC:
 264                         printf("meta: ");
 265                         return;
 266
 267                 case ILMIC:
 268                         printf("ilmi: ");
 269                         snmp_print(p, length);
 270                         return;
 271                 }
 272         }
 273
 274         switch (traftype) {
 275
 276         case ATM_LLC:
 277         default:
 278                 /*
 279                  * Assumes traffic is LLC if unknown.
 280                  */
 281                 atm_llc_print(p, length, caplen);
 282                 break;
 283
 284         case ATM_LANE:
 285                 lane_print(p, length, caplen);
 286                 break;
 287         }
 288 }
 289
 290 int
 291 oam_print (const u_char *p, u_int length) {
 292
 293     u_int16_t cell_header, cell_type, func_type,vpi,vci,payload,clp;
 294
 295     cell_header = EXTRACT_32BITS(p);
 296     cell_type = ((*(p+4))>>4) & 0x0f;
 297     func_type = *(p) & 0x0f;
 298
 299     vpi = (cell_header>>20)&0xff;
 300     vci = (cell_header>>4)&0xffff;
 301     payload = (cell_header>>1)&0x7;
 302     clp = cell_header&0x1;
 303
 304     switch (vci) {
 305     case OAMF4SC:
 306         printf("OAM F4 (segment), ");
 307             break;
 308     case OAMF4EC:
 309         printf("OAM F4 (end), ");
 310         break;
 311     default:
 312         printf("OAM F5, ");
 313         break;
 314     }
 315
 316     if (eflag)
 317         printf("vpi %u, vci %u, payload %u, clp %u, ",vpi,vci,payload,clp);
 318
 319     printf("cell-type %s (%u)",
 320            tok2str(oam_celltype_values, "unknown", cell_type),
 321            cell_type);
 322
 323     if (oam_functype_values[cell_type] == NULL)
 324         printf(", func-type unknown (%u)", func_type);
 325     else
 326         printf(", func-type %s (%u)",
 327                bittok2str(oam_functype_values[cell_type],"none",func_type),
 328                func_type);
 329
 330     printf(", length %u",length);
 331     return 1;
 332 }