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
  22 /* \summary: Asynchronous Transfer Mode (ATM) printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #define ND_LONGJMP_FROM_TCHECK
  31 #include "netdissect.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34 #include "atm.h"
  35 #include "llc.h"
  36
  37 /* start of the original atmuni31.h */
  38
  39 /*
  40  * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
  41  * All rights reserved.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 3. All advertising materials mentioning features or use of this software
  52  *    must display the following acknowledgement:
  53  *      This product includes software developed by Yen Yen Lim and
  54         North Dakota State University
  55  * 4. The name of the author may not be used to endorse or promote products
  56  *    derived from this software without specific prior written permission.
  57  *
  58  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  59  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  60  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  61  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  62  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  63  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  64  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  66  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  67  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  68  * POSSIBILITY OF SUCH DAMAGE.
  69  */
  70
  71 /* Based on UNI3.1 standard by ATM Forum */
  72
  73 /* ATM traffic types based on VPI=0 and (the following VCI */
  74 #define VCI_PPC                 0x05    /* Point-to-point signal msg */
  75 #define VCI_BCC                 0x02    /* Broadcast signal msg */
  76 #define VCI_OAMF4SC             0x03    /* Segment OAM F4 flow cell */
  77 #define VCI_OAMF4EC             0x04    /* End-to-end OAM F4 flow cell */
  78 #define VCI_METAC               0x01    /* Meta signal msg */
  79 #define VCI_ILMIC               0x10    /* ILMI msg */
  80
  81 /* Q.2931 signalling messages */
  82 #define CALL_PROCEED            0x02    /* call proceeding */
  83 #define CONNECT                 0x07    /* connect */
  84 #define CONNECT_ACK             0x0f    /* connect_ack */
  85 #define SETUP                   0x05    /* setup */
  86 #define RELEASE                 0x4d    /* release */
  87 #define RELEASE_DONE            0x5a    /* release_done */
  88 #define RESTART                 0x46    /* restart */
  89 #define RESTART_ACK             0x4e    /* restart ack */
  90 #define STATUS                  0x7d    /* status */
  91 #define STATUS_ENQ              0x75    /* status ack */
  92 #define ADD_PARTY               0x80    /* add party */
  93 #define ADD_PARTY_ACK           0x81    /* add party ack */
  94 #define ADD_PARTY_REJ           0x82    /* add party rej */
  95 #define DROP_PARTY              0x83    /* drop party */
  96 #define DROP_PARTY_ACK          0x84    /* drop party ack */
  97
  98 /* Information Element Parameters in the signalling messages */
  99 #define CAUSE                   0x08    /* cause */
 100 #define ENDPT_REF               0x54    /* endpoint reference */
 101 #define AAL_PARA                0x58    /* ATM adaptation layer parameters */
 102 #define TRAFF_DESCRIP           0x59    /* atm traffic descriptors */
 103 #define CONNECT_ID              0x5a    /* connection identifier */
 104 #define QOS_PARA                0x5c    /* quality of service parameters */
 105 #define B_HIGHER                0x5d    /* broadband higher layer information */
 106 #define B_BEARER                0x5e    /* broadband bearer capability */
 107 #define B_LOWER                 0x5f    /* broadband lower information */
 108 #define CALLING_PARTY           0x6c    /* calling party number */
 109 #define CALLED_PARTY            0x70    /* called party nmber */
 110
 111 #define Q2931                   0x09
 112
 113 /* Q.2931 signalling general messages format */
 114 #define PROTO_POS       0       /* offset of protocol discriminator */
 115 #define CALL_REF_POS    2       /* offset of call reference value */
 116 #define MSG_TYPE_POS    5       /* offset of message type */
 117 #if 0
 118 #define MSG_LEN_POS     7       /* offset of mesage length */
 119 #define IE_BEGIN_POS    9       /* offset of first information element */
 120
 121 /* format of signalling messages */
 122 #define TYPE_POS        0
 123 #define LEN_POS         2
 124 #define FIELD_BEGIN_POS 4
 125 #endif
 126
 127 /* end of the original atmuni31.h */
 128
 129
 130 #define OAM_CRC10_MASK 0x3ff
 131 #define OAM_PAYLOAD_LEN 48
 132 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
 133 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
 134
 135 static const struct tok oam_f_values[] = {
 136     { VCI_OAMF4SC, "OAM F4 (segment)" },
 137     { VCI_OAMF4EC, "OAM F4 (end)" },
 138     { 0, NULL }
 139 };
 140
 141 static const struct tok atm_pty_values[] = {
 142     { 0x0, "user data, uncongested, SDU 0" },
 143     { 0x1, "user data, uncongested, SDU 1" },
 144     { 0x2, "user data, congested, SDU 0" },
 145     { 0x3, "user data, congested, SDU 1" },
 146     { 0x4, "VCC OAM F5 flow segment" },
 147     { 0x5, "VCC OAM F5 flow end-to-end" },
 148     { 0x6, "Traffic Control and resource Mgmt" },
 149     { 0, NULL }
 150 };
 151
 152 #define OAM_CELLTYPE_FM 0x1
 153 #define OAM_CELLTYPE_PM 0x2
 154 #define OAM_CELLTYPE_AD 0x8
 155 #define OAM_CELLTYPE_SM 0xf
 156
 157 static const struct tok oam_celltype_values[] = {
 158     { OAM_CELLTYPE_FM, "Fault Management" },
 159     { OAM_CELLTYPE_PM, "Performance Management" },
 160     { OAM_CELLTYPE_AD, "activate/deactivate" },
 161     { OAM_CELLTYPE_SM, "System Management" },
 162     { 0, NULL }
 163 };
 164
 165 #define OAM_FM_FUNCTYPE_AIS       0x0
 166 #define OAM_FM_FUNCTYPE_RDI       0x1
 167 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
 168 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
 169
 170 static const struct tok oam_fm_functype_values[] = {
 171     { OAM_FM_FUNCTYPE_AIS, "AIS" },
 172     { OAM_FM_FUNCTYPE_RDI, "RDI" },
 173     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
 174     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
 175     { 0, NULL }
 176 };
 177
 178 static const struct tok oam_pm_functype_values[] = {
 179     { 0x0, "Forward Monitoring" },
 180     { 0x1, "Backward Reporting" },
 181     { 0x2, "Monitoring and Reporting" },
 182     { 0, NULL }
 183 };
 184
 185 static const struct tok oam_ad_functype_values[] = {
 186     { 0x0, "Performance Monitoring" },
 187     { 0x1, "Continuity Check" },
 188     { 0, NULL }
 189 };
 190
 191 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
 192
 193 static const struct tok oam_fm_loopback_indicator_values[] = {
 194     { 0x0, "Reply" },
 195     { 0x1, "Request" },
 196     { 0, NULL }
 197 };
 198
 199 static const struct uint_tokary oam_celltype2tokary[] = {
 200         { OAM_CELLTYPE_FM, oam_fm_functype_values },
 201         { OAM_CELLTYPE_PM, oam_pm_functype_values },
 202         { OAM_CELLTYPE_AD, oam_ad_functype_values },
 203         /* uint2tokary() does not use array termination. */
 204 };
 205
 206 /*
 207  * Print an RFC 1483 LLC-encapsulated ATM frame.
 208  */
 209 static u_int
 210 atm_llc_print(netdissect_options *ndo,
 211               const u_char *p, int length, int caplen)
 212 {
 213         int llc_hdrlen;
 214
 215         llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
 216         if (llc_hdrlen < 0) {
 217                 /* packet not known, print raw packet */
 218                 if (!ndo->ndo_suppress_default_print)
 219                         ND_DEFAULTPRINT(p, caplen);
 220                 llc_hdrlen = -llc_hdrlen;
 221         }
 222         return (llc_hdrlen);
 223 }
 224
 225 /*
 226  * Given a SAP value, generate the LLC header value for a UI packet
 227  * with that SAP as the source and destination SAP.
 228  */
 229 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 230
 231 /*
 232  * This is the top level routine of the printer.  'p' points
 233  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 234  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 235  * is the number of bytes actually captured.
 236  */
 237 void
 238 atm_if_print(netdissect_options *ndo,
 239              const struct pcap_pkthdr *h, const u_char *p)
 240 {
 241         u_int caplen = h->caplen;
 242         u_int length = h->len;
 243         uint32_t llchdr;
 244         u_int hdrlen = 0;
 245
 246         ndo->ndo_protocol = "atm";
 247
 248         /* Cisco Style NLPID ? */
 249         if (GET_U_1(p) == LLC_UI) {
 250             if (ndo->ndo_eflag)
 251                 ND_PRINT("CNLPID ");
 252             ndo->ndo_ll_hdr_len += 1;
 253             isoclns_print(ndo, p + 1, length - 1);
 254             return;
 255         }
 256
 257         /*
 258          * Must have at least a DSAP, an SSAP, and the first byte of the
 259          * control field.
 260          */
 261
 262         /*
 263          * Extract the presumed LLC header into a variable, for quick
 264          * testing.
 265          * Then check for a header that's neither a header for a SNAP
 266          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 267          * an 802.2-but-no-SNAP IP packet.
 268          */
 269         llchdr = GET_BE_U_3(p);
 270         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 271             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 272             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 273                 /*
 274                  * XXX - assume 802.6 MAC header from Fore driver.
 275                  *
 276                  * Unfortunately, the above list doesn't check for
 277                  * all known SAPs, doesn't check for headers where
 278                  * the source and destination SAP aren't the same,
 279                  * and doesn't check for non-UI frames.  It also
 280                  * runs the risk of an 802.6 MAC header that happens
 281                  * to begin with one of those values being
 282                  * incorrectly treated as an 802.2 header.
 283                  *
 284                  * So is that Fore driver still around?  And, if so,
 285                  * is it still putting 802.6 MAC headers on ATM
 286                  * packets?  If so, could it be changed to use a
 287                  * new DLT_IEEE802_6 value if we added it?
 288                  */
 289                 if (ndo->ndo_eflag)
 290                         ND_PRINT("%08x%08x %08x%08x ",
 291                                GET_BE_U_4(p),
 292                                GET_BE_U_4(p + 4),
 293                                GET_BE_U_4(p + 8),
 294                                GET_BE_U_4(p + 12));
 295                 /* Always cover the full header. */
 296                 ND_TCHECK_LEN(p, 20);
 297                 p += 20;
 298                 length -= 20;
 299                 caplen -= 20;
 300                 hdrlen += 20;
 301         }
 302         ndo->ndo_ll_hdr_len += hdrlen;
 303         ndo->ndo_ll_hdr_len += atm_llc_print(ndo, p, length, caplen);
 304 }
 305
 306 /*
 307  * ATM signalling.
 308  */
 309 static const struct tok msgtype2str[] = {
 310         { CALL_PROCEED,         "Call_proceeding" },
 311         { CONNECT,              "Connect" },
 312         { CONNECT_ACK,          "Connect_ack" },
 313         { SETUP,                "Setup" },
 314         { RELEASE,              "Release" },
 315         { RELEASE_DONE,         "Release_complete" },
 316         { RESTART,              "Restart" },
 317         { RESTART_ACK,          "Restart_ack" },
 318         { STATUS,               "Status" },
 319         { STATUS_ENQ,           "Status_enquiry" },
 320         { ADD_PARTY,            "Add_party" },
 321         { ADD_PARTY_ACK,        "Add_party_ack" },
 322         { ADD_PARTY_REJ,        "Add_party_reject" },
 323         { DROP_PARTY,           "Drop_party" },
 324         { DROP_PARTY_ACK,       "Drop_party_ack" },
 325         { 0,                    NULL }
 326 };
 327
 328 static void
 329 sig_print(netdissect_options *ndo,
 330           const u_char *p)
 331 {
 332         uint32_t call_ref;
 333
 334         if (GET_U_1(p + PROTO_POS) == Q2931) {
 335                 /*
 336                  * protocol:Q.2931 for User to Network Interface
 337                  * (UNI 3.1) signalling
 338                  */
 339                 ND_PRINT("Q.2931");
 340                 ND_PRINT(":%s ",
 341                     tok2str(msgtype2str, "msgtype#%u", GET_U_1(p + MSG_TYPE_POS)));
 342
 343                 /*
 344                  * The call reference comes before the message type,
 345                  * so if we know we have the message type, which we
 346                  * do from the caplen test above, we also know we have
 347                  * the call reference.
 348                  */
 349                 call_ref = GET_BE_U_3(p + CALL_REF_POS);
 350                 ND_PRINT("CALL_REF:0x%06x", call_ref);
 351         } else {
 352                 /* SSCOP with some unknown protocol atop it */
 353                 ND_PRINT("SSCOP, proto %u ", GET_U_1(p + PROTO_POS));
 354         }
 355 }
 356
 357 /*
 358  * Print an ATM PDU (such as an AAL5 PDU).
 359  */
 360 void
 361 atm_print(netdissect_options *ndo,
 362           u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 363           u_int caplen)
 364 {
 365         ndo->ndo_protocol = "atm";
 366         if (ndo->ndo_eflag)
 367                 ND_PRINT("VPI:%u VCI:%u ", vpi, vci);
 368
 369         if (vpi == 0) {
 370                 switch (vci) {
 371
 372                 case VCI_PPC:
 373                         sig_print(ndo, p);
 374                         return;
 375
 376                 case VCI_BCC:
 377                         ND_PRINT("broadcast sig: ");
 378                         return;
 379
 380                 case VCI_OAMF4SC: /* fall through */
 381                 case VCI_OAMF4EC:
 382                         oam_print(ndo, p, length, ATM_OAM_HEC);
 383                         return;
 384
 385                 case VCI_METAC:
 386                         ND_PRINT("meta: ");
 387                         return;
 388
 389                 case VCI_ILMIC:
 390                         ND_PRINT("ilmi: ");
 391                         snmp_print(ndo, p, length);
 392                         return;
 393                 }
 394         }
 395
 396         switch (traftype) {
 397
 398         case ATM_LLC:
 399         default:
 400                 /*
 401                  * Assumes traffic is LLC if unknown.
 402                  */
 403                 atm_llc_print(ndo, p, length, caplen);
 404                 break;
 405
 406         case ATM_LANE:
 407                 lane_print(ndo, p, length, caplen);
 408                 break;
 409         }
 410 }
 411
 412 struct oam_fm_loopback_t {
 413     nd_uint8_t  loopback_indicator;
 414     nd_uint32_t correlation_tag;
 415     nd_byte     loopback_id[12];
 416     nd_byte     source_id[12];
 417     nd_byte     unused[16];
 418 };
 419
 420 struct oam_fm_ais_rdi_t {
 421     nd_uint8_t  failure_type;
 422     nd_byte     failure_location[16];
 423     nd_byte     unused[28];
 424 };
 425
 426 void
 427 oam_print(netdissect_options *ndo,
 428           const u_char *p, u_int length, u_int hec)
 429 {
 430     uint32_t cell_header;
 431     uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
 432     uint8_t  cell_type, func_type, payload, clp;
 433     const struct tok *oam_functype_str;
 434
 435     union {
 436         const struct oam_fm_loopback_t *oam_fm_loopback;
 437         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 438     } oam_ptr;
 439
 440     ndo->ndo_protocol = "oam";
 441     cell_header = GET_BE_U_4(p + hec);
 442     cell_type = (GET_U_1((p + ATM_HDR_LEN_NOHEC + hec)) >> 4) & 0x0f;
 443     func_type = GET_U_1((p + ATM_HDR_LEN_NOHEC + hec)) & 0x0f;
 444
 445     vpi = (cell_header>>20)&0xff;
 446     vci = (cell_header>>4)&0xffff;
 447     payload = (cell_header>>1)&0x7;
 448     clp = cell_header&0x1;
 449
 450     ND_PRINT("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 451            tok2str(oam_f_values, "OAM F5", vci),
 452            vpi, vci,
 453            tok2str(atm_pty_values, "Unknown", payload),
 454            clp, length);
 455
 456     if (!ndo->ndo_vflag) {
 457         return;
 458     }
 459
 460     ND_PRINT("\n\tcell-type %s (%u)",
 461            tok2str(oam_celltype_values, "unknown", cell_type),
 462            cell_type);
 463
 464     oam_functype_str = uint2tokary(oam_celltype2tokary, cell_type);
 465     if (oam_functype_str == NULL)
 466         ND_PRINT(", func-type unknown (%u)", func_type);
 467     else
 468         ND_PRINT(", func-type %s (%u)",
 469                tok2str(oam_functype_str, "none", func_type),
 470                func_type);
 471
 472     p += ATM_HDR_LEN_NOHEC + hec;
 473
 474     switch (cell_type << 4 | func_type) {
 475     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 476         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 477         ND_TCHECK_SIZE(oam_ptr.oam_fm_loopback);
 478         ND_PRINT("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 479                tok2str(oam_fm_loopback_indicator_values,
 480                        "Unknown",
 481                        GET_U_1(oam_ptr.oam_fm_loopback->loopback_indicator) & OAM_FM_LOOPBACK_INDICATOR_MASK),
 482                GET_BE_U_4(oam_ptr.oam_fm_loopback->correlation_tag));
 483         ND_PRINT("\n\tLocation-ID ");
 484         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 485             if (idx % 2) {
 486                 ND_PRINT("%04x ",
 487                          GET_BE_U_2(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
 488             }
 489         }
 490         ND_PRINT("\n\tSource-ID   ");
 491         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 492             if (idx % 2) {
 493                 ND_PRINT("%04x ",
 494                          GET_BE_U_2(&oam_ptr.oam_fm_loopback->source_id[idx]));
 495             }
 496         }
 497         break;
 498
 499     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 500     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 501         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 502         ND_TCHECK_SIZE(oam_ptr.oam_fm_ais_rdi);
 503         ND_PRINT("\n\tFailure-type 0x%02x",
 504                  GET_U_1(oam_ptr.oam_fm_ais_rdi->failure_type));
 505         ND_PRINT("\n\tLocation-ID ");
 506         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 507             if (idx % 2) {
 508                 ND_PRINT("%04x ",
 509                          GET_BE_U_2(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
 510             }
 511         }
 512         break;
 513
 514     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 515         /* FIXME */
 516         break;
 517
 518     default:
 519         break;
 520     }
 521
 522     /* crc10 checksum verification */
 523     cksum = GET_BE_U_2(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 524         & OAM_CRC10_MASK;
 525     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 526
 527     ND_PRINT("\n\tcksum 0x%03x (%scorrect)",
 528            cksum,
 529            cksum_shouldbe == 0 ? "" : "in");
 530 }