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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "interface.h"
  32 #include "extract.h"
  33 #include "addrtoname.h"
  34 #include "ethertype.h"
  35 #include "atm.h"
  36 #include "atmuni31.h"
  37 #include "llc.h"
  38
  39 #include "ether.h"
  40
  41 static const char tstr[] = "[|atm]";
  42
  43 #define OAM_CRC10_MASK 0x3ff
  44 #define OAM_PAYLOAD_LEN 48
  45 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
  46 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
  47
  48 static const struct tok oam_f_values[] = {
  49     { VCI_OAMF4SC, "OAM F4 (segment)" },
  50     { VCI_OAMF4EC, "OAM F4 (end)" },
  51     { 0, NULL }
  52 };
  53
  54 static const struct tok atm_pty_values[] = {
  55     { 0x0, "user data, uncongested, SDU 0" },
  56     { 0x1, "user data, uncongested, SDU 1" },
  57     { 0x2, "user data, congested, SDU 0" },
  58     { 0x3, "user data, congested, SDU 1" },
  59     { 0x4, "VCC OAM F5 flow segment" },
  60     { 0x5, "VCC OAM F5 flow end-to-end" },
  61     { 0x6, "Traffic Control and resource Mgmt" },
  62     { 0, NULL }
  63 };
  64
  65 #define OAM_CELLTYPE_FM 0x1
  66 #define OAM_CELLTYPE_PM 0x2
  67 #define OAM_CELLTYPE_AD 0x8
  68 #define OAM_CELLTYPE_SM 0xf
  69
  70 static const struct tok oam_celltype_values[] = {
  71     { OAM_CELLTYPE_FM, "Fault Management" },
  72     { OAM_CELLTYPE_PM, "Performance Management" },
  73     { OAM_CELLTYPE_AD, "activate/deactivate" },
  74     { OAM_CELLTYPE_SM, "System Management" },
  75     { 0, NULL }
  76 };
  77
  78 #define OAM_FM_FUNCTYPE_AIS       0x0
  79 #define OAM_FM_FUNCTYPE_RDI       0x1
  80 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
  81 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
  82
  83 static const struct tok oam_fm_functype_values[] = {
  84     { OAM_FM_FUNCTYPE_AIS, "AIS" },
  85     { OAM_FM_FUNCTYPE_RDI, "RDI" },
  86     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
  87     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
  88     { 0, NULL }
  89 };
  90
  91 static const struct tok oam_pm_functype_values[] = {
  92     { 0x0, "Forward Monitoring" },
  93     { 0x1, "Backward Reporting" },
  94     { 0x2, "Monitoring and Reporting" },
  95     { 0, NULL }
  96 };
  97
  98 static const struct tok oam_ad_functype_values[] = {
  99     { 0x0, "Performance Monitoring" },
 100     { 0x1, "Continuity Check" },
 101     { 0, NULL }
 102 };
 103
 104 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
 105
 106 static const struct tok oam_fm_loopback_indicator_values[] = {
 107     { 0x0, "Reply" },
 108     { 0x1, "Request" },
 109     { 0, NULL }
 110 };
 111
 112 static const struct tok *oam_functype_values[16] = {
 113     NULL,
 114     oam_fm_functype_values, /* 1 */
 115     oam_pm_functype_values, /* 2 */
 116     NULL,
 117     NULL,
 118     NULL,
 119     NULL,
 120     NULL,
 121     oam_ad_functype_values, /* 8 */
 122     NULL,
 123     NULL,
 124     NULL,
 125     NULL,
 126     NULL,
 127     NULL,
 128     NULL
 129 };
 130
 131 /*
 132  * Print an RFC 1483 LLC-encapsulated ATM frame.
 133  */
 134 static void
 135 atm_llc_print(const u_char *p, int length, int caplen)
 136 {
 137         u_short extracted_ethertype;
 138
 139         if (!llc_print(p, length, caplen, NULL, NULL,
 140             &extracted_ethertype)) {
 141                 /* ether_type not known, print raw packet */
 142                 if (extracted_ethertype) {
 143                         printf("(LLC %s) ",
 144                 etherproto_string(htons(extracted_ethertype)));
 145                 }
 146                 if (!suppress_default_print)
 147                         default_print(p, caplen);
 148         }
 149 }
 150
 151 /*
 152  * Given a SAP value, generate the LLC header value for a UI packet
 153  * with that SAP as the source and destination SAP.
 154  */
 155 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 156
 157 /*
 158  * This is the top level routine of the printer.  'p' points
 159  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 160  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 161  * is the number of bytes actually captured.
 162  */
 163 u_int
 164 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
 165 {
 166         u_int caplen = h->caplen;
 167         u_int length = h->len;
 168         u_int32_t llchdr;
 169         u_int hdrlen = 0;
 170
 171         if (caplen < 8) {
 172                 printf("%s", tstr);
 173                 return (caplen);
 174         }
 175
 176         /* Cisco Style NLPID ? */
 177         if (*p == LLC_UI) {
 178             if (eflag)
 179                 printf("CNLPID ");
 180             isoclns_print(p+1, length-1, caplen-1);
 181             return hdrlen;
 182         }
 183
 184         /*
 185          * Extract the presumed LLC header into a variable, for quick
 186          * testing.
 187          * Then check for a header that's neither a header for a SNAP
 188          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 189          * an 802.2-but-no-SNAP IP packet.
 190          */
 191         llchdr = EXTRACT_24BITS(p);
 192         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 193             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 194             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 195                 /*
 196                  * XXX - assume 802.6 MAC header from Fore driver.
 197                  *
 198                  * Unfortunately, the above list doesn't check for
 199                  * all known SAPs, doesn't check for headers where
 200                  * the source and destination SAP aren't the same,
 201                  * and doesn't check for non-UI frames.  It also
 202                  * runs the risk of an 802.6 MAC header that happens
 203                  * to begin with one of those values being
 204                  * incorrectly treated as an 802.2 header.
 205                  *
 206                  * So is that Fore driver still around?  And, if so,
 207                  * is it still putting 802.6 MAC headers on ATM
 208                  * packets?  If so, could it be changed to use a
 209                  * new DLT_IEEE802_6 value if we added it?
 210                  */
 211                 if (eflag)
 212                         printf("%08x%08x %08x%08x ",
 213                                EXTRACT_32BITS(p),
 214                                EXTRACT_32BITS(p+4),
 215                                EXTRACT_32BITS(p+8),
 216                                EXTRACT_32BITS(p+12));
 217                 p += 20;
 218                 length -= 20;
 219                 caplen -= 20;
 220                 hdrlen += 20;
 221         }
 222         atm_llc_print(p, length, caplen);
 223         return (hdrlen);
 224 }
 225
 226 /*
 227  * ATM signalling.
 228  */
 229 static const struct tok msgtype2str[] = {
 230         { CALL_PROCEED,         "Call_proceeding" },
 231         { CONNECT,              "Connect" },
 232         { CONNECT_ACK,          "Connect_ack" },
 233         { SETUP,                "Setup" },
 234         { RELEASE,              "Release" },
 235         { RELEASE_DONE,         "Release_complete" },
 236         { RESTART,              "Restart" },
 237         { RESTART_ACK,          "Restart_ack" },
 238         { STATUS,               "Status" },
 239         { STATUS_ENQ,           "Status_enquiry" },
 240         { ADD_PARTY,            "Add_party" },
 241         { ADD_PARTY_ACK,        "Add_party_ack" },
 242         { ADD_PARTY_REJ,        "Add_party_reject" },
 243         { DROP_PARTY,           "Drop_party" },
 244         { DROP_PARTY_ACK,       "Drop_party_ack" },
 245         { 0,                    NULL }
 246 };
 247
 248 static void
 249 sig_print(const u_char *p, int caplen)
 250 {
 251         bpf_u_int32 call_ref;
 252
 253         if (caplen < PROTO_POS) {
 254                 printf("%s", tstr);
 255                 return;
 256         }
 257         if (p[PROTO_POS] == Q2931) {
 258                 /*
 259                  * protocol:Q.2931 for User to Network Interface
 260                  * (UNI 3.1) signalling
 261                  */
 262                 printf("Q.2931");
 263                 if (caplen < MSG_TYPE_POS) {
 264                         printf(" %s", tstr);
 265                         return;
 266                 }
 267                 printf(":%s ",
 268                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 269
 270                 /*
 271                  * The call reference comes before the message type,
 272                  * so if we know we have the message type, which we
 273                  * do from the caplen test above, we also know we have
 274                  * the call reference.
 275                  */
 276                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 277                 printf("CALL_REF:0x%06x", call_ref);
 278         } else {
 279                 /* SCCOP with some unknown protocol atop it */
 280                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 281         }
 282 }
 283
 284 /*
 285  * Print an ATM PDU (such as an AAL5 PDU).
 286  */
 287 void
 288 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 289     u_int caplen)
 290 {
 291         if (eflag)
 292                 printf("VPI:%u VCI:%u ", vpi, vci);
 293
 294         if (vpi == 0) {
 295                 switch (vci) {
 296
 297                 case VCI_PPC:
 298                         sig_print(p, caplen);
 299                         return;
 300
 301                 case VCI_BCC:
 302                         printf("broadcast sig: ");
 303                         return;
 304
 305                 case VCI_OAMF4SC: /* fall through */
 306                 case VCI_OAMF4EC:
 307                         oam_print(p, length, ATM_OAM_HEC);
 308                         return;
 309
 310                 case VCI_METAC:
 311                         printf("meta: ");
 312                         return;
 313
 314                 case VCI_ILMIC:
 315                         printf("ilmi: ");
 316                         snmp_print(p, length);
 317                         return;
 318                 }
 319         }
 320
 321         switch (traftype) {
 322
 323         case ATM_LLC:
 324         default:
 325                 /*
 326                  * Assumes traffic is LLC if unknown.
 327                  */
 328                 atm_llc_print(p, length, caplen);
 329                 break;
 330
 331         case ATM_LANE:
 332                 lane_print(p, length, caplen);
 333                 break;
 334         }
 335 }
 336
 337 struct oam_fm_loopback_t {
 338     u_int8_t loopback_indicator;
 339     u_int8_t correlation_tag[4];
 340     u_int8_t loopback_id[12];
 341     u_int8_t source_id[12];
 342     u_int8_t unused[16];
 343 };
 344
 345 struct oam_fm_ais_rdi_t {
 346     u_int8_t failure_type;
 347     u_int8_t failure_location[16];
 348     u_int8_t unused[28];
 349 };
 350
 351 int
 352 oam_print (const u_char *p, u_int length, u_int hec) {
 353
 354     u_int32_t cell_header;
 355     u_int16_t vpi, vci, cksum, cksum_shouldbe, idx;
 356     u_int8_t  cell_type, func_type, payload, clp;
 357
 358     union {
 359         const struct oam_fm_loopback_t *oam_fm_loopback;
 360         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 361     } oam_ptr;
 362
 363
 364     cell_header = EXTRACT_32BITS(p+hec);
 365     cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
 366     func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
 367
 368     vpi = (cell_header>>20)&0xff;
 369     vci = (cell_header>>4)&0xffff;
 370     payload = (cell_header>>1)&0x7;
 371     clp = cell_header&0x1;
 372
 373     printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 374            tok2str(oam_f_values, "OAM F5", vci),
 375            vpi, vci,
 376            tok2str(atm_pty_values, "Unknown", payload),
 377            clp, length);
 378
 379     if (!vflag) {
 380         return 1;
 381     }
 382
 383     printf("\n\tcell-type %s (%u)",
 384            tok2str(oam_celltype_values, "unknown", cell_type),
 385            cell_type);
 386
 387     if (oam_functype_values[cell_type] == NULL)
 388         printf(", func-type unknown (%u)", func_type);
 389     else
 390         printf(", func-type %s (%u)",
 391                tok2str(oam_functype_values[cell_type],"none",func_type),
 392                func_type);
 393
 394     p += ATM_HDR_LEN_NOHEC + hec;
 395
 396     switch (cell_type << 4 | func_type) {
 397     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 398         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 399         printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 400                tok2str(oam_fm_loopback_indicator_values,
 401                        "Unknown",
 402                        oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
 403                EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag));
 404         printf("\n\tLocation-ID ");
 405         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 406             if (idx % 2) {
 407                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
 408             }
 409         }
 410         printf("\n\tSource-ID   ");
 411         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 412             if (idx % 2) {
 413                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]));
 414             }
 415         }
 416         break;
 417
 418     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 419     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 420         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 421         printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type);
 422         printf("\n\tLocation-ID ");
 423         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 424             if (idx % 2) {
 425                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
 426             }
 427         }
 428         break;
 429
 430     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 431         /* FIXME */
 432         break;
 433
 434     default:
 435         break;
 436     }
 437
 438     /* crc10 checksum verification */
 439     cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 440         & OAM_CRC10_MASK;
 441     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 442
 443     printf("\n\tcksum 0x%03x (%scorrect)",
 444            cksum,
 445            cksum_shouldbe == 0 ? "" : "in");
 446
 447     return 1;
 448 }