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 <pcap.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "extract.h"
  34 #include "addrtoname.h"
  35 #include "ethertype.h"
  36 #include "atm.h"
  37 #include "atmuni31.h"
  38 #include "llc.h"
  39
  40 #include "ether.h"
  41
  42 static const char tstr[] = "[|atm]";
  43
  44 #define OAM_CRC10_MASK 0x3ff
  45 #define OAM_PAYLOAD_LEN 48
  46 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
  47 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
  48
  49 static const struct tok oam_f_values[] = {
  50     { VCI_OAMF4SC, "OAM F4 (segment)" },
  51     { VCI_OAMF4EC, "OAM F4 (end)" },
  52     { 0, NULL }
  53 };
  54
  55 static const struct tok atm_pty_values[] = {
  56     { 0x0, "user data, uncongested, SDU 0" },
  57     { 0x1, "user data, uncongested, SDU 1" },
  58     { 0x2, "user data, congested, SDU 0" },
  59     { 0x3, "user data, congested, SDU 1" },
  60     { 0x4, "VCC OAM F5 flow segment" },
  61     { 0x5, "VCC OAM F5 flow end-to-end" },
  62     { 0x6, "Traffic Control and resource Mgmt" },
  63     { 0, NULL }
  64 };
  65
  66 #define OAM_CELLTYPE_FM 0x1
  67 #define OAM_CELLTYPE_PM 0x2
  68 #define OAM_CELLTYPE_AD 0x8
  69 #define OAM_CELLTYPE_SM 0xf
  70
  71 static const struct tok oam_celltype_values[] = {
  72     { OAM_CELLTYPE_FM, "Fault Management" },
  73     { OAM_CELLTYPE_PM, "Performance Management" },
  74     { OAM_CELLTYPE_AD, "activate/deactivate" },
  75     { OAM_CELLTYPE_SM, "System Management" },
  76     { 0, NULL }
  77 };
  78
  79 #define OAM_FM_FUNCTYPE_AIS       0x0
  80 #define OAM_FM_FUNCTYPE_RDI       0x1
  81 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
  82 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
  83
  84 static const struct tok oam_fm_functype_values[] = {
  85     { OAM_FM_FUNCTYPE_AIS, "AIS" },
  86     { OAM_FM_FUNCTYPE_RDI, "RDI" },
  87     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
  88     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
  89     { 0, NULL }
  90 };
  91
  92 static const struct tok oam_pm_functype_values[] = {
  93     { 0x0, "Forward Monitoring" },
  94     { 0x1, "Backward Reporting" },
  95     { 0x2, "Monitoring and Reporting" },
  96     { 0, NULL }
  97 };
  98
  99 static const struct tok oam_ad_functype_values[] = {
 100     { 0x0, "Performance Monitoring" },
 101     { 0x1, "Continuity Check" },
 102     { 0, NULL }
 103 };
 104
 105 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
 106
 107 static const struct tok oam_fm_loopback_indicator_values[] = {
 108     { 0x0, "Reply" },
 109     { 0x1, "Request" },
 110     { 0, NULL }
 111 };
 112
 113 static const struct tok *oam_functype_values[16] = {
 114     NULL,
 115     oam_fm_functype_values, /* 1 */
 116     oam_pm_functype_values, /* 2 */
 117     NULL,
 118     NULL,
 119     NULL,
 120     NULL,
 121     NULL,
 122     oam_ad_functype_values, /* 8 */
 123     NULL,
 124     NULL,
 125     NULL,
 126     NULL,
 127     NULL,
 128     NULL,
 129     NULL
 130 };
 131
 132 /*
 133  * Print an RFC 1483 LLC-encapsulated ATM frame.
 134  */
 135 static void
 136 atm_llc_print(const u_char *p, int length, int caplen)
 137 {
 138         u_short extracted_ethertype;
 139
 140         if (!llc_print(p, length, caplen, NULL, NULL,
 141             &extracted_ethertype)) {
 142                 /* ether_type not known, print raw packet */
 143                 if (extracted_ethertype) {
 144                         printf("(LLC %s) ",
 145                 etherproto_string(htons(extracted_ethertype)));
 146                 }
 147                 if (!suppress_default_print)
 148                         default_print(p, caplen);
 149         }
 150 }
 151
 152 /*
 153  * Given a SAP value, generate the LLC header value for a UI packet
 154  * with that SAP as the source and destination SAP.
 155  */
 156 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 157
 158 /*
 159  * This is the top level routine of the printer.  'p' points
 160  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 161  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 162  * is the number of bytes actually captured.
 163  */
 164 u_int
 165 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
 166 {
 167         u_int caplen = h->caplen;
 168         u_int length = h->len;
 169         u_int32_t llchdr;
 170         u_int hdrlen = 0;
 171
 172         if (caplen < 8) {
 173                 printf("%s", tstr);
 174                 return (caplen);
 175         }
 176
 177         /* Cisco Style NLPID ? */
 178         if (*p == LLC_UI) {
 179             if (eflag)
 180                 printf("CNLPID ");
 181             isoclns_print(p+1, length-1, caplen-1);
 182             return hdrlen;
 183         }
 184
 185         /*
 186          * Extract the presumed LLC header into a variable, for quick
 187          * testing.
 188          * Then check for a header that's neither a header for a SNAP
 189          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 190          * an 802.2-but-no-SNAP IP packet.
 191          */
 192         llchdr = EXTRACT_24BITS(p);
 193         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 194             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 195             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 196                 /*
 197                  * XXX - assume 802.6 MAC header from Fore driver.
 198                  *
 199                  * Unfortunately, the above list doesn't check for
 200                  * all known SAPs, doesn't check for headers where
 201                  * the source and destination SAP aren't the same,
 202                  * and doesn't check for non-UI frames.  It also
 203                  * runs the risk of an 802.6 MAC header that happens
 204                  * to begin with one of those values being
 205                  * incorrectly treated as an 802.2 header.
 206                  *
 207                  * So is that Fore driver still around?  And, if so,
 208                  * is it still putting 802.6 MAC headers on ATM
 209                  * packets?  If so, could it be changed to use a
 210                  * new DLT_IEEE802_6 value if we added it?
 211                  */
 212                 if (eflag)
 213                         printf("%08x%08x %08x%08x ",
 214                                EXTRACT_32BITS(p),
 215                                EXTRACT_32BITS(p+4),
 216                                EXTRACT_32BITS(p+8),
 217                                EXTRACT_32BITS(p+12));
 218                 p += 20;
 219                 length -= 20;
 220                 caplen -= 20;
 221                 hdrlen += 20;
 222         }
 223         atm_llc_print(p, length, caplen);
 224         return (hdrlen);
 225 }
 226
 227 /*
 228  * ATM signalling.
 229  */
 230 static const struct tok msgtype2str[] = {
 231         { CALL_PROCEED,         "Call_proceeding" },
 232         { CONNECT,              "Connect" },
 233         { CONNECT_ACK,          "Connect_ack" },
 234         { SETUP,                "Setup" },
 235         { RELEASE,              "Release" },
 236         { RELEASE_DONE,         "Release_complete" },
 237         { RESTART,              "Restart" },
 238         { RESTART_ACK,          "Restart_ack" },
 239         { STATUS,               "Status" },
 240         { STATUS_ENQ,           "Status_enquiry" },
 241         { ADD_PARTY,            "Add_party" },
 242         { ADD_PARTY_ACK,        "Add_party_ack" },
 243         { ADD_PARTY_REJ,        "Add_party_reject" },
 244         { DROP_PARTY,           "Drop_party" },
 245         { DROP_PARTY_ACK,       "Drop_party_ack" },
 246         { 0,                    NULL }
 247 };
 248
 249 static void
 250 sig_print(const u_char *p, int caplen)
 251 {
 252         bpf_u_int32 call_ref;
 253
 254         if (caplen < PROTO_POS) {
 255                 printf("%s", tstr);
 256                 return;
 257         }
 258         if (p[PROTO_POS] == Q2931) {
 259                 /*
 260                  * protocol:Q.2931 for User to Network Interface
 261                  * (UNI 3.1) signalling
 262                  */
 263                 printf("Q.2931");
 264                 if (caplen < MSG_TYPE_POS) {
 265                         printf(" %s", tstr);
 266                         return;
 267                 }
 268                 printf(":%s ",
 269                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
 270
 271                 /*
 272                  * The call reference comes before the message type,
 273                  * so if we know we have the message type, which we
 274                  * do from the caplen test above, we also know we have
 275                  * the call reference.
 276                  */
 277                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 278                 printf("CALL_REF:0x%06x", call_ref);
 279         } else {
 280                 /* SCCOP with some unknown protocol atop it */
 281                 printf("SSCOP, proto %d ", p[PROTO_POS]);
 282         }
 283 }
 284
 285 /*
 286  * Print an ATM PDU (such as an AAL5 PDU).
 287  */
 288 void
 289 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 290     u_int caplen)
 291 {
 292         if (eflag)
 293                 printf("VPI:%u VCI:%u ", vpi, vci);
 294
 295         if (vpi == 0) {
 296                 switch (vci) {
 297
 298                 case VCI_PPC:
 299                         sig_print(p, caplen);
 300                         return;
 301
 302                 case VCI_BCC:
 303                         printf("broadcast sig: ");
 304                         return;
 305
 306                 case VCI_OAMF4SC: /* fall through */
 307                 case VCI_OAMF4EC:
 308                         oam_print(p, length, ATM_OAM_HEC);
 309                         return;
 310
 311                 case VCI_METAC:
 312                         printf("meta: ");
 313                         return;
 314
 315                 case VCI_ILMIC:
 316                         printf("ilmi: ");
 317                         snmp_print(p, length);
 318                         return;
 319                 }
 320         }
 321
 322         switch (traftype) {
 323
 324         case ATM_LLC:
 325         default:
 326                 /*
 327                  * Assumes traffic is LLC if unknown.
 328                  */
 329                 atm_llc_print(p, length, caplen);
 330                 break;
 331
 332         case ATM_LANE:
 333                 lane_print(p, length, caplen);
 334                 break;
 335         }
 336 }
 337
 338 struct oam_fm_loopback_t {
 339     u_int8_t loopback_indicator;
 340     u_int8_t correlation_tag[4];
 341     u_int8_t loopback_id[12];
 342     u_int8_t source_id[12];
 343     u_int8_t unused[16];
 344 };
 345
 346 struct oam_fm_ais_rdi_t {
 347     u_int8_t failure_type;
 348     u_int8_t failure_location[16];
 349     u_int8_t unused[28];
 350 };
 351
 352 int
 353 oam_print (const u_char *p, u_int length, u_int hec) {
 354
 355     u_int32_t cell_header;
 356     u_int16_t vpi, vci, cksum, cksum_shouldbe, idx;
 357     u_int8_t  cell_type, func_type, payload, clp;
 358
 359     union {
 360         const struct oam_fm_loopback_t *oam_fm_loopback;
 361         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 362     } oam_ptr;
 363
 364
 365     cell_header = EXTRACT_32BITS(p+hec);
 366     cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
 367     func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
 368
 369     vpi = (cell_header>>20)&0xff;
 370     vci = (cell_header>>4)&0xffff;
 371     payload = (cell_header>>1)&0x7;
 372     clp = cell_header&0x1;
 373
 374     printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 375            tok2str(oam_f_values, "OAM F5", vci),
 376            vpi, vci,
 377            tok2str(atm_pty_values, "Unknown", payload),
 378            clp, length);
 379
 380     if (!vflag) {
 381         return 1;
 382     }
 383
 384     printf("\n\tcell-type %s (%u)",
 385            tok2str(oam_celltype_values, "unknown", cell_type),
 386            cell_type);
 387
 388     if (oam_functype_values[cell_type] == NULL)
 389         printf(", func-type unknown (%u)", func_type);
 390     else
 391         printf(", func-type %s (%u)",
 392                tok2str(oam_functype_values[cell_type],"none",func_type),
 393                func_type);
 394
 395     p += ATM_HDR_LEN_NOHEC + hec;
 396
 397     switch (cell_type << 4 | func_type) {
 398     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 399         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 400         printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 401                tok2str(oam_fm_loopback_indicator_values,
 402                        "Unknown",
 403                        oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
 404                EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag));
 405         printf("\n\tLocation-ID ");
 406         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 407             if (idx % 2) {
 408                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
 409             }
 410         }
 411         printf("\n\tSource-ID   ");
 412         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 413             if (idx % 2) {
 414                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]));
 415             }
 416         }
 417         break;
 418
 419     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 420     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 421         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 422         printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type);
 423         printf("\n\tLocation-ID ");
 424         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 425             if (idx % 2) {
 426                 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
 427             }
 428         }
 429         break;
 430
 431     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 432         /* FIXME */
 433         break;
 434
 435     default:
 436         break;
 437     }
 438
 439     /* crc10 checksum verification */
 440     cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 441         & OAM_CRC10_MASK;
 442     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 443
 444     printf("\n\tcksum 0x%03x (%scorrect)",
 445            cksum,
 446            cksum_shouldbe == 0 ? "" : "in");
 447
 448     return 1;
 449 }