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 1.49 2007-10-22 19:37:51 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 static const char tstr[] = "[|atm]";
  47
  48 #define OAM_CRC10_MASK 0x3ff
  49 #define OAM_PAYLOAD_LEN 48
  50 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
  51 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
  52
  53 static const struct tok oam_f_values[] = {
  54     { VCI_OAMF4SC, "OAM F4 (segment)" },
  55     { VCI_OAMF4EC, "OAM F4 (end)" },
  56     { 0, NULL }
  57 };
  58
  59 static const struct tok atm_pty_values[] = {
  60     { 0x0, "user data, uncongested, SDU 0" },
  61     { 0x1, "user data, uncongested, SDU 1" },
  62     { 0x2, "user data, congested, SDU 0" },
  63     { 0x3, "user data, congested, SDU 1" },
  64     { 0x4, "VCC OAM F5 flow segment" },
  65     { 0x5, "VCC OAM F5 flow end-to-end" },
  66     { 0x6, "Traffic Control and resource Mgmt" },
  67     { 0, NULL }
  68 };
  69
  70 #define OAM_CELLTYPE_FM 0x1
  71 #define OAM_CELLTYPE_PM 0x2
  72 #define OAM_CELLTYPE_AD 0x8
  73 #define OAM_CELLTYPE_SM 0xf
  74
  75 static const struct tok oam_celltype_values[] = {
  76     { OAM_CELLTYPE_FM, "Fault Management" },
  77     { OAM_CELLTYPE_PM, "Performance Management" },
  78     { OAM_CELLTYPE_AD, "activate/deactivate" },
  79     { OAM_CELLTYPE_SM, "System Management" },
  80     { 0, NULL }
  81 };
  82
  83 #define OAM_FM_FUNCTYPE_AIS       0x0
  84 #define OAM_FM_FUNCTYPE_RDI       0x1
  85 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
  86 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
  87
  88 static const struct tok oam_fm_functype_values[] = {
  89     { OAM_FM_FUNCTYPE_AIS, "AIS" },
  90     { OAM_FM_FUNCTYPE_RDI, "RDI" },
  91     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
  92     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
  93     { 0, NULL }
  94 };
  95
  96 static const struct tok oam_pm_functype_values[] = {
  97     { 0x0, "Forward Monitoring" },
  98     { 0x1, "Backward Reporting" },
  99     { 0x2, "Monitoring and Reporting" },
 100     { 0, NULL }
 101 };
 102
 103 static const struct tok oam_ad_functype_values[] = {
 104     { 0x0, "Performance Monitoring" },
 105     { 0x1, "Continuity Check" },
 106     { 0, NULL }
 107 };
 108
 109 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
 110
 111 static const struct tok oam_fm_loopback_indicator_values[] = {
 112     { 0x0, "Reply" },
 113     { 0x1, "Request" },
 114     { 0, NULL }
 115 };
 116
 117 static const struct tok *oam_functype_values[16] = {
 118     NULL,
 119     oam_fm_functype_values, /* 1 */
 120     oam_pm_functype_values, /* 2 */
 121     NULL,
 122     NULL,
 123     NULL,
 124     NULL,
 125     NULL,
 126     oam_ad_functype_values, /* 8 */
 127     NULL,
 128     NULL,
 129     NULL,
 130     NULL,
 131     NULL,
 132     NULL,
 133     NULL
 134 };
 135
 136 /*
 137  * Print an RFC 1483 LLC-encapsulated ATM frame.
 138  */
 139 static void
 140 atm_llc_print(const u_char *p, int length, int caplen)
 141 {
 142         u_short extracted_ethertype;
 143
 144         if (!llc_print(p, length, caplen, NULL, NULL,
 145             &extracted_ethertype)) {
 146                 /* ether_type not known, print raw packet */
 147                 if (extracted_ethertype) {
 148                         printf("(LLC %s) ",
 149                 etherproto_string(htons(extracted_ethertype)));
 150                 }
 151                 if (!suppress_default_print)
 152                         default_print(p, caplen);
 153         }
 154 }
 155
 156 /*
 157  * Given a SAP value, generate the LLC header value for a UI packet
 158  * with that SAP as the source and destination SAP.
 159  */
 160 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 161
 162 /*
 163  * This is the top level routine of the printer.  'p' points
 164  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 165  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 166  * is the number of bytes actually captured.
 167  */
 168 u_int
 169 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
 170 {
 171         u_int caplen = h->caplen;
 172         u_int length = h->len;
 173         u_int32_t llchdr;
 174         u_int hdrlen = 0;
 175
 176         if (caplen < 8) {
 177                 printf("%s", tstr);
 178                 return (caplen);
 179         }
 180
 181         /* Cisco Style NLPID ? */
 182         if (*p == LLC_UI) {
 183             if (eflag)
 184                 printf("CNLPID ");
 185             isoclns_print(p+1, length-1, caplen-1);
 186             return hdrlen;
 187         }
 188
 189         /*
 190          * Extract the presumed LLC header into a variable, for quick
 191          * testing.
 192          * Then check for a header that's neither a header for a SNAP
 193          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 194          * an 802.2-but-no-SNAP IP packet.
 195          */
 196         llchdr = EXTRACT_24BITS(p);
 197         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 198             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 199             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 200                 /*
 201                  * XXX - assume 802.6 MAC header from Fore driver.
 202                  *
 203                  * Unfortunately, the above list doesn't check for
 204                  * all known SAPs, doesn't check for headers where
 205                  * the source and destination SAP aren't the same,
 206                  * and doesn't check for non-UI frames.  It also
 207                  * runs the risk of an 802.6 MAC header that happens
 208                  * to begin with one of those values being
 209                  * incorrectly treated as an 802.2 header.
 210                  *
 211                  * So is that Fore driver still around?  And, if so,
 212                  * is it still putting 802.6 MAC headers on ATM
 213                  * packets?  If so, could it be changed to use a
 214                  * new DLT_IEEE802_6 value if we added it?
 215                  */
 216                 if (eflag)
 217                         printf("%08x%08x %08x%08x ",
 218                                EXTRACT_32BITS(p),
 219                                EXTRACT_32BITS(p+4),
 220                                EXTRACT_32BITS(p+8),
 221                                EXTRACT_32BITS(p+12));
 222                 p += 20;
 223                 length -= 20;
 224                 caplen -= 20;
 225                 hdrlen += 20;
 226         }
 227         atm_llc_print(p, length, caplen);
 228         return (hdrlen);
 229 }
 230
 231 /*
 232  * ATM signalling.
 233  */
 234 static const struct tok msgtype2str[] = {
 235         { CALL_PROCEED,         "Call_proceeding" },
 236         { CONNECT,              "Connect" },
 237         { CONNECT_ACK,          "Connect_ack" },
 238         { SETUP,                "Setup" },
 239         { RELEASE,              "Release" },
 240         { RELEASE_DONE,         "Release_complete" },
 241         { RESTART,              "Restart" },
 242         { RESTART_ACK,          "Restart_ack" },
 243         { STATUS,               "Status" },
 244         { STATUS_ENQ,           "Status_enquiry" },
 245         { ADD_PARTY,            "Add_party" },
 246         { ADD_PARTY_ACK,        "Add_party_ack" },
 247         { ADD_PARTY_REJ,        "Add_party_reject" },
 248         { DROP_PARTY,           "Drop_party" },
 249         { DROP_PARTY_ACK,       "Drop_party_ack" },
 250         { 0,                    NULL }
 251 };
 252
 253 static void
 254 sig_print(const u_char *p, int caplen)
 255 {
 256         bpf_u_int32 call_ref;
 257
 258         if (caplen < PROTO_POS) {
 259                 printf("%s", tstr);
 260                 return;
 261         }
 262         if (p[PROTO_POS] == Q2931) {
 263                 /*
 264                  * protocol:Q.2931 for User to Network Interface
 265                  * (UNI 3.1) signalling
 266                  */
 267                 printf("Q.2931");
 268                 if (caplen < MSG_TYPE_POS) {
 269                         printf(" %s", tstr);
 270                         return;
 271                 }
 272                 printf(":%s ",
 273                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 274
 275                 /*
 276                  * The call reference comes before the message type,
 277                  * so if we know we have the message type, which we
 278                  * do from the caplen test above, we also know we have
 279                  * the call reference.
 280                  */
 281                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 282                 printf("CALL_REF:0x%06x", call_ref);
 283         } else {
 284                 /* SCCOP with some unknown protocol atop it */
 285                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 286         }
 287 }
 288
 289 /*
 290  * Print an ATM PDU (such as an AAL5 PDU).
 291  */
 292 void
 293 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 294     u_int caplen)
 295 {
 296         if (eflag)
 297                 printf("VPI:%u VCI:%u ", vpi, vci);
 298
 299         if (vpi == 0) {
 300                 switch (vci) {
 301
 302                 case VCI_PPC:
 303                         sig_print(p, caplen);
 304                         return;
 305
 306                 case VCI_BCC:
 307                         printf("broadcast sig: ");
 308                         return;
 309
 310                 case VCI_OAMF4SC: /* fall through */
 311                 case VCI_OAMF4EC:
 312                         oam_print(p, length, ATM_OAM_HEC);
 313                         return;
 314
 315                 case VCI_METAC:
 316                         printf("meta: ");
 317                         return;
 318
 319                 case VCI_ILMIC:
 320                         printf("ilmi: ");
 321                         snmp_print(p, length);
 322                         return;
 323                 }
 324         }
 325
 326         switch (traftype) {
 327
 328         case ATM_LLC:
 329         default:
 330                 /*
 331                  * Assumes traffic is LLC if unknown.
 332                  */
 333                 atm_llc_print(p, length, caplen);
 334                 break;
 335
 336         case ATM_LANE:
 337                 lane_print(p, length, caplen);
 338                 break;
 339         }
 340 }
 341
 342 struct oam_fm_loopback_t {
 343     u_int8_t loopback_indicator;
 344     u_int8_t correlation_tag[4];
 345     u_int8_t loopback_id[12];
 346     u_int8_t source_id[12];
 347     u_int8_t unused[16];
 348 };
 349
 350 struct oam_fm_ais_rdi_t {
 351     u_int8_t failure_type;
 352     u_int8_t failure_location[16];
 353     u_int8_t unused[28];
 354 };
 355
 356 int
 357 oam_print (const u_char *p, u_int length, u_int hec) {
 358
 359     u_int32_t cell_header;
 360     u_int16_t vpi, vci, cksum, cksum_shouldbe, idx;
 361     u_int8_t  cell_type, func_type, payload, clp;
 362
 363     union {
 364         const struct oam_fm_loopback_t *oam_fm_loopback;
 365         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 366     } oam_ptr;
 367
 368
 369     cell_header = EXTRACT_32BITS(p+hec);
 370     cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
 371     func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
 372
 373     vpi = (cell_header>>20)&0xff;
 374     vci = (cell_header>>4)&0xffff;
 375     payload = (cell_header>>1)&0x7;
 376     clp = cell_header&0x1;
 377
 378     printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 379            tok2str(oam_f_values, "OAM F5", vci),
 380            vpi, vci,
 381            tok2str(atm_pty_values, "Unknown", payload),
 382            clp, length);
 383
 384     if (!vflag) {
 385         return 1;
 386     }
 387
 388     printf("\n\tcell-type %s (%u)",
 389            tok2str(oam_celltype_values, "unknown", cell_type),
 390            cell_type);
 391
 392     if (oam_functype_values[cell_type] == NULL)
 393         printf(", func-type unknown (%u)", func_type);
 394     else
 395         printf(", func-type %s (%u)",
 396                tok2str(oam_functype_values[cell_type],"none",func_type),
 397                func_type);
 398
 399     p += ATM_HDR_LEN_NOHEC + hec;
 400
 401     switch (cell_type << 4 | func_type) {
 402     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 403         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 404         printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 405                tok2str(oam_fm_loopback_indicator_values,
 406                        "Unknown",
 407                        oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
 408                EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag));
 409         printf("\n\tLocation-ID ");
 410         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 411             if (idx % 2) {
 412                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
 413             }
 414         }
 415         printf("\n\tSource-ID   ");
 416         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 417             if (idx % 2) {
 418                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]));
 419             }
 420         }
 421         break;
 422
 423     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 424     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 425         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 426         printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type);
 427         printf("\n\tLocation-ID ");
 428         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 429             if (idx % 2) {
 430                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
 431             }
 432         }
 433         break;
 434
 435     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 436         /* FIXME */
 437         break;
 438
 439     default:
 440         break;
 441     }
 442
 443     /* crc10 checksum verification */
 444     cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 445         & OAM_CRC10_MASK;
 446     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 447
 448     printf("\n\tcksum 0x%03x (%scorrect)",
 449            cksum,
 450            cksum_shouldbe == 0 ? "" : "in");
 451
 452     return 1;
 453 }