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 "interface.h"
  29 #include "extract.h"
  30 #include "addrtoname.h"
  31 #include "atm.h"
  32 #include "atmuni31.h"
  33 #include "llc.h"
  34
  35 static const char tstr[] = "[|atm]";
  36
  37 #define OAM_CRC10_MASK 0x3ff
  38 #define OAM_PAYLOAD_LEN 48
  39 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
  40 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
  41
  42 static const struct tok oam_f_values[] = {
  43     { VCI_OAMF4SC, "OAM F4 (segment)" },
  44     { VCI_OAMF4EC, "OAM F4 (end)" },
  45     { 0, NULL }
  46 };
  47
  48 static const struct tok atm_pty_values[] = {
  49     { 0x0, "user data, uncongested, SDU 0" },
  50     { 0x1, "user data, uncongested, SDU 1" },
  51     { 0x2, "user data, congested, SDU 0" },
  52     { 0x3, "user data, congested, SDU 1" },
  53     { 0x4, "VCC OAM F5 flow segment" },
  54     { 0x5, "VCC OAM F5 flow end-to-end" },
  55     { 0x6, "Traffic Control and resource Mgmt" },
  56     { 0, NULL }
  57 };
  58
  59 #define OAM_CELLTYPE_FM 0x1
  60 #define OAM_CELLTYPE_PM 0x2
  61 #define OAM_CELLTYPE_AD 0x8
  62 #define OAM_CELLTYPE_SM 0xf
  63
  64 static const struct tok oam_celltype_values[] = {
  65     { OAM_CELLTYPE_FM, "Fault Management" },
  66     { OAM_CELLTYPE_PM, "Performance Management" },
  67     { OAM_CELLTYPE_AD, "activate/deactivate" },
  68     { OAM_CELLTYPE_SM, "System Management" },
  69     { 0, NULL }
  70 };
  71
  72 #define OAM_FM_FUNCTYPE_AIS       0x0
  73 #define OAM_FM_FUNCTYPE_RDI       0x1
  74 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
  75 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
  76
  77 static const struct tok oam_fm_functype_values[] = {
  78     { OAM_FM_FUNCTYPE_AIS, "AIS" },
  79     { OAM_FM_FUNCTYPE_RDI, "RDI" },
  80     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
  81     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
  82     { 0, NULL }
  83 };
  84
  85 static const struct tok oam_pm_functype_values[] = {
  86     { 0x0, "Forward Monitoring" },
  87     { 0x1, "Backward Reporting" },
  88     { 0x2, "Monitoring and Reporting" },
  89     { 0, NULL }
  90 };
  91
  92 static const struct tok oam_ad_functype_values[] = {
  93     { 0x0, "Performance Monitoring" },
  94     { 0x1, "Continuity Check" },
  95     { 0, NULL }
  96 };
  97
  98 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
  99
 100 static const struct tok oam_fm_loopback_indicator_values[] = {
 101     { 0x0, "Reply" },
 102     { 0x1, "Request" },
 103     { 0, NULL }
 104 };
 105
 106 static const struct tok *oam_functype_values[16] = {
 107     NULL,
 108     oam_fm_functype_values, /* 1 */
 109     oam_pm_functype_values, /* 2 */
 110     NULL,
 111     NULL,
 112     NULL,
 113     NULL,
 114     NULL,
 115     oam_ad_functype_values, /* 8 */
 116     NULL,
 117     NULL,
 118     NULL,
 119     NULL,
 120     NULL,
 121     NULL,
 122     NULL
 123 };
 124
 125 /*
 126  * Print an RFC 1483 LLC-encapsulated ATM frame.
 127  */
 128 static void
 129 atm_llc_print(netdissect_options *ndo,
 130               const u_char *p, int length, int caplen)
 131 {
 132         u_short extracted_ethertype;
 133
 134         if (!llc_print(ndo, p, length, caplen, NULL, NULL,
 135             &extracted_ethertype)) {
 136                 /* ether_type not known, print raw packet */
 137                 if (extracted_ethertype) {
 138                         ND_PRINT((ndo, "(LLC %s) ",
 139                 etherproto_string(htons(extracted_ethertype))));
 140                 }
 141                 if (!ndo->ndo_suppress_default_print)
 142                         ND_DEFAULTPRINT(p, caplen);
 143         }
 144 }
 145
 146 /*
 147  * Given a SAP value, generate the LLC header value for a UI packet
 148  * with that SAP as the source and destination SAP.
 149  */
 150 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 151
 152 /*
 153  * This is the top level routine of the printer.  'p' points
 154  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 155  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 156  * is the number of bytes actually captured.
 157  */
 158 u_int
 159 atm_if_print(netdissect_options *ndo,
 160              const struct pcap_pkthdr *h, const u_char *p)
 161 {
 162         u_int caplen = h->caplen;
 163         u_int length = h->len;
 164         uint32_t llchdr;
 165         u_int hdrlen = 0;
 166
 167         if (caplen < 1 || length < 1) {
 168                 ND_PRINT((ndo, "%s", tstr));
 169                 return (caplen);
 170         }
 171
 172         /* Cisco Style NLPID ? */
 173         if (*p == LLC_UI) {
 174             if (ndo->ndo_eflag)
 175                 ND_PRINT((ndo, "CNLPID "));
 176             isoclns_print(ndo, p + 1, length - 1, caplen - 1);
 177             return hdrlen;
 178         }
 179
 180         /*
 181          * Must have at least a DSAP, an SSAP, and the first byte of the
 182          * control field.
 183          */
 184         if (caplen < 3 || length < 3) {
 185                 ND_PRINT((ndo, "%s", tstr));
 186                 return (caplen);
 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 (caplen < 20 || length < 20) {
 217                         ND_PRINT((ndo, "%s", tstr));
 218                         return (caplen);
 219                 }
 220                 if (ndo->ndo_eflag)
 221                         ND_PRINT((ndo, "%08x%08x %08x%08x ",
 222                                EXTRACT_32BITS(p),
 223                                EXTRACT_32BITS(p+4),
 224                                EXTRACT_32BITS(p+8),
 225                                EXTRACT_32BITS(p+12)));
 226                 p += 20;
 227                 length -= 20;
 228                 caplen -= 20;
 229                 hdrlen += 20;
 230         }
 231         atm_llc_print(ndo, p, length, caplen);
 232         return (hdrlen);
 233 }
 234
 235 /*
 236  * ATM signalling.
 237  */
 238 static const struct tok msgtype2str[] = {
 239         { CALL_PROCEED,         "Call_proceeding" },
 240         { CONNECT,              "Connect" },
 241         { CONNECT_ACK,          "Connect_ack" },
 242         { SETUP,                "Setup" },
 243         { RELEASE,              "Release" },
 244         { RELEASE_DONE,         "Release_complete" },
 245         { RESTART,              "Restart" },
 246         { RESTART_ACK,          "Restart_ack" },
 247         { STATUS,               "Status" },
 248         { STATUS_ENQ,           "Status_enquiry" },
 249         { ADD_PARTY,            "Add_party" },
 250         { ADD_PARTY_ACK,        "Add_party_ack" },
 251         { ADD_PARTY_REJ,        "Add_party_reject" },
 252         { DROP_PARTY,           "Drop_party" },
 253         { DROP_PARTY_ACK,       "Drop_party_ack" },
 254         { 0,                    NULL }
 255 };
 256
 257 static void
 258 sig_print(netdissect_options *ndo,
 259           const u_char *p, int caplen)
 260 {
 261         uint32_t call_ref;
 262
 263         if (caplen < PROTO_POS) {
 264                 ND_PRINT((ndo, "%s", tstr));
 265                 return;
 266         }
 267         if (p[PROTO_POS] == Q2931) {
 268                 /*
 269                  * protocol:Q.2931 for User to Network Interface
 270                  * (UNI 3.1) signalling
 271                  */
 272                 ND_PRINT((ndo, "Q.2931"));
 273                 if (caplen < MSG_TYPE_POS) {
 274                         ND_PRINT((ndo, " %s", tstr));
 275                         return;
 276                 }
 277                 ND_PRINT((ndo, ":%s ",
 278                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])));
 279
 280                 /*
 281                  * The call reference comes before the message type,
 282                  * so if we know we have the message type, which we
 283                  * do from the caplen test above, we also know we have
 284                  * the call reference.
 285                  */
 286                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 287                 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref));
 288         } else {
 289                 /* SCCOP with some unknown protocol atop it */
 290                 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS]));
 291         }
 292 }
 293
 294 /*
 295  * Print an ATM PDU (such as an AAL5 PDU).
 296  */
 297 void
 298 atm_print(netdissect_options *ndo,
 299           u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 300           u_int caplen)
 301 {
 302         if (ndo->ndo_eflag)
 303                 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci));
 304
 305         if (vpi == 0) {
 306                 switch (vci) {
 307
 308                 case VCI_PPC:
 309                         sig_print(ndo, p, caplen);
 310                         return;
 311
 312                 case VCI_BCC:
 313                         ND_PRINT((ndo, "broadcast sig: "));
 314                         return;
 315
 316                 case VCI_OAMF4SC: /* fall through */
 317                 case VCI_OAMF4EC:
 318                         oam_print(ndo, p, length, ATM_OAM_HEC);
 319                         return;
 320
 321                 case VCI_METAC:
 322                         ND_PRINT((ndo, "meta: "));
 323                         return;
 324
 325                 case VCI_ILMIC:
 326                         ND_PRINT((ndo, "ilmi: "));
 327                         snmp_print(ndo, p, length);
 328                         return;
 329                 }
 330         }
 331
 332         switch (traftype) {
 333
 334         case ATM_LLC:
 335         default:
 336                 /*
 337                  * Assumes traffic is LLC if unknown.
 338                  */
 339                 atm_llc_print(ndo, p, length, caplen);
 340                 break;
 341
 342         case ATM_LANE:
 343                 lane_print(ndo, p, length, caplen);
 344                 break;
 345         }
 346 }
 347
 348 struct oam_fm_loopback_t {
 349     uint8_t loopback_indicator;
 350     uint8_t correlation_tag[4];
 351     uint8_t loopback_id[12];
 352     uint8_t source_id[12];
 353     uint8_t unused[16];
 354 };
 355
 356 struct oam_fm_ais_rdi_t {
 357     uint8_t failure_type;
 358     uint8_t failure_location[16];
 359     uint8_t unused[28];
 360 };
 361
 362 int
 363 oam_print (netdissect_options *ndo,
 364            const u_char *p, u_int length, u_int hec)
 365 {
 366     uint32_t cell_header;
 367     uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
 368     uint8_t  cell_type, func_type, payload, clp;
 369
 370     union {
 371         const struct oam_fm_loopback_t *oam_fm_loopback;
 372         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 373     } oam_ptr;
 374
 375
 376     cell_header = EXTRACT_32BITS(p+hec);
 377     cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
 378     func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
 379
 380     vpi = (cell_header>>20)&0xff;
 381     vci = (cell_header>>4)&0xffff;
 382     payload = (cell_header>>1)&0x7;
 383     clp = cell_header&0x1;
 384
 385     ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 386            tok2str(oam_f_values, "OAM F5", vci),
 387            vpi, vci,
 388            tok2str(atm_pty_values, "Unknown", payload),
 389            clp, length));
 390
 391     if (!ndo->ndo_vflag) {
 392         return 1;
 393     }
 394
 395     ND_PRINT((ndo, "\n\tcell-type %s (%u)",
 396            tok2str(oam_celltype_values, "unknown", cell_type),
 397            cell_type));
 398
 399     if (oam_functype_values[cell_type] == NULL)
 400         ND_PRINT((ndo, ", func-type unknown (%u)", func_type));
 401     else
 402         ND_PRINT((ndo, ", func-type %s (%u)",
 403                tok2str(oam_functype_values[cell_type],"none",func_type),
 404                func_type));
 405
 406     p += ATM_HDR_LEN_NOHEC + hec;
 407
 408     switch (cell_type << 4 | func_type) {
 409     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 410         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 411         ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 412                tok2str(oam_fm_loopback_indicator_values,
 413                        "Unknown",
 414                        oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
 415                EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)));
 416         ND_PRINT((ndo, "\n\tLocation-ID "));
 417         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 418             if (idx % 2) {
 419                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])));
 420             }
 421         }
 422         ND_PRINT((ndo, "\n\tSource-ID   "));
 423         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 424             if (idx % 2) {
 425                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])));
 426             }
 427         }
 428         break;
 429
 430     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 431     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 432         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 433         ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type));
 434         ND_PRINT((ndo, "\n\tLocation-ID "));
 435         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 436             if (idx % 2) {
 437                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])));
 438             }
 439         }
 440         break;
 441
 442     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 443         /* FIXME */
 444         break;
 445
 446     default:
 447         break;
 448     }
 449
 450     /* crc10 checksum verification */
 451     cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 452         & OAM_CRC10_MASK;
 453     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 454
 455     ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)",
 456            cksum,
 457            cksum_shouldbe == 0 ? "" : "in"));
 458
 459     return 1;
 460 }