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 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include "interface.h"
  30 #include "extract.h"
  31 #include "addrtoname.h"
  32 #include "atm.h"
  33 #include "atmuni31.h"
  34 #include "llc.h"
  35
  36 static const char tstr[] = "[|atm]";
  37
  38 #define OAM_CRC10_MASK 0x3ff
  39 #define OAM_PAYLOAD_LEN 48
  40 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
  41 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
  42
  43 static const struct tok oam_f_values[] = {
  44     { VCI_OAMF4SC, "OAM F4 (segment)" },
  45     { VCI_OAMF4EC, "OAM F4 (end)" },
  46     { 0, NULL }
  47 };
  48
  49 static const struct tok atm_pty_values[] = {
  50     { 0x0, "user data, uncongested, SDU 0" },
  51     { 0x1, "user data, uncongested, SDU 1" },
  52     { 0x2, "user data, congested, SDU 0" },
  53     { 0x3, "user data, congested, SDU 1" },
  54     { 0x4, "VCC OAM F5 flow segment" },
  55     { 0x5, "VCC OAM F5 flow end-to-end" },
  56     { 0x6, "Traffic Control and resource Mgmt" },
  57     { 0, NULL }
  58 };
  59
  60 #define OAM_CELLTYPE_FM 0x1
  61 #define OAM_CELLTYPE_PM 0x2
  62 #define OAM_CELLTYPE_AD 0x8
  63 #define OAM_CELLTYPE_SM 0xf
  64
  65 static const struct tok oam_celltype_values[] = {
  66     { OAM_CELLTYPE_FM, "Fault Management" },
  67     { OAM_CELLTYPE_PM, "Performance Management" },
  68     { OAM_CELLTYPE_AD, "activate/deactivate" },
  69     { OAM_CELLTYPE_SM, "System Management" },
  70     { 0, NULL }
  71 };
  72
  73 #define OAM_FM_FUNCTYPE_AIS       0x0
  74 #define OAM_FM_FUNCTYPE_RDI       0x1
  75 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
  76 #define OAM_FM_FUNCTYPE_LOOPBACK  0x8
  77
  78 static const struct tok oam_fm_functype_values[] = {
  79     { OAM_FM_FUNCTYPE_AIS, "AIS" },
  80     { OAM_FM_FUNCTYPE_RDI, "RDI" },
  81     { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
  82     { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
  83     { 0, NULL }
  84 };
  85
  86 static const struct tok oam_pm_functype_values[] = {
  87     { 0x0, "Forward Monitoring" },
  88     { 0x1, "Backward Reporting" },
  89     { 0x2, "Monitoring and Reporting" },
  90     { 0, NULL }
  91 };
  92
  93 static const struct tok oam_ad_functype_values[] = {
  94     { 0x0, "Performance Monitoring" },
  95     { 0x1, "Continuity Check" },
  96     { 0, NULL }
  97 };
  98
  99 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
 100
 101 static const struct tok oam_fm_loopback_indicator_values[] = {
 102     { 0x0, "Reply" },
 103     { 0x1, "Request" },
 104     { 0, NULL }
 105 };
 106
 107 static const struct tok *oam_functype_values[16] = {
 108     NULL,
 109     oam_fm_functype_values, /* 1 */
 110     oam_pm_functype_values, /* 2 */
 111     NULL,
 112     NULL,
 113     NULL,
 114     NULL,
 115     NULL,
 116     oam_ad_functype_values, /* 8 */
 117     NULL,
 118     NULL,
 119     NULL,
 120     NULL,
 121     NULL,
 122     NULL,
 123     NULL
 124 };
 125
 126 /*
 127  * Print an RFC 1483 LLC-encapsulated ATM frame.
 128  */
 129 static void
 130 atm_llc_print(netdissect_options *ndo,
 131               const u_char *p, int length, int caplen)
 132 {
 133         u_short extracted_ethertype;
 134
 135         if (!llc_print(ndo, p, length, caplen, NULL, NULL,
 136             &extracted_ethertype)) {
 137                 /* ether_type not known, print raw packet */
 138                 if (extracted_ethertype) {
 139                         ND_PRINT((ndo, "(LLC %s) ",
 140                 etherproto_string(htons(extracted_ethertype))));
 141                 }
 142                 if (!ndo->ndo_suppress_default_print)
 143                         ND_DEFAULTPRINT(p, caplen);
 144         }
 145 }
 146
 147 /*
 148  * Given a SAP value, generate the LLC header value for a UI packet
 149  * with that SAP as the source and destination SAP.
 150  */
 151 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
 152
 153 /*
 154  * This is the top level routine of the printer.  'p' points
 155  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
 156  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 157  * is the number of bytes actually captured.
 158  */
 159 u_int
 160 atm_if_print(netdissect_options *ndo,
 161              const struct pcap_pkthdr *h, const u_char *p)
 162 {
 163         u_int caplen = h->caplen;
 164         u_int length = h->len;
 165         uint32_t llchdr;
 166         u_int hdrlen = 0;
 167
 168         if (caplen < 1 || length < 1) {
 169                 ND_PRINT((ndo, "%s", tstr));
 170                 return (caplen);
 171         }
 172
 173         /* Cisco Style NLPID ? */
 174         if (*p == LLC_UI) {
 175             if (ndo->ndo_eflag)
 176                 ND_PRINT((ndo, "CNLPID "));
 177             isoclns_print(ndo, p + 1, length - 1, caplen - 1);
 178             return hdrlen;
 179         }
 180
 181         /*
 182          * Must have at least a DSAP, an SSAP, and the first byte of the
 183          * control field.
 184          */
 185         if (caplen < 3 || length < 3) {
 186                 ND_PRINT((ndo, "%s", tstr));
 187                 return (caplen);
 188         }
 189
 190         /*
 191          * Extract the presumed LLC header into a variable, for quick
 192          * testing.
 193          * Then check for a header that's neither a header for a SNAP
 194          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 195          * an 802.2-but-no-SNAP IP packet.
 196          */
 197         llchdr = EXTRACT_24BITS(p);
 198         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 199             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 200             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 201                 /*
 202                  * XXX - assume 802.6 MAC header from Fore driver.
 203                  *
 204                  * Unfortunately, the above list doesn't check for
 205                  * all known SAPs, doesn't check for headers where
 206                  * the source and destination SAP aren't the same,
 207                  * and doesn't check for non-UI frames.  It also
 208                  * runs the risk of an 802.6 MAC header that happens
 209                  * to begin with one of those values being
 210                  * incorrectly treated as an 802.2 header.
 211                  *
 212                  * So is that Fore driver still around?  And, if so,
 213                  * is it still putting 802.6 MAC headers on ATM
 214                  * packets?  If so, could it be changed to use a
 215                  * new DLT_IEEE802_6 value if we added it?
 216                  */
 217                 if (caplen < 20 || length < 20) {
 218                         ND_PRINT((ndo, "%s", tstr));
 219                         return (caplen);
 220                 }
 221                 if (ndo->ndo_eflag)
 222                         ND_PRINT((ndo, "%08x%08x %08x%08x ",
 223                                EXTRACT_32BITS(p),
 224                                EXTRACT_32BITS(p+4),
 225                                EXTRACT_32BITS(p+8),
 226                                EXTRACT_32BITS(p+12)));
 227                 p += 20;
 228                 length -= 20;
 229                 caplen -= 20;
 230                 hdrlen += 20;
 231         }
 232         atm_llc_print(ndo, p, length, caplen);
 233         return (hdrlen);
 234 }
 235
 236 /*
 237  * ATM signalling.
 238  */
 239 static const struct tok msgtype2str[] = {
 240         { CALL_PROCEED,         "Call_proceeding" },
 241         { CONNECT,              "Connect" },
 242         { CONNECT_ACK,          "Connect_ack" },
 243         { SETUP,                "Setup" },
 244         { RELEASE,              "Release" },
 245         { RELEASE_DONE,         "Release_complete" },
 246         { RESTART,              "Restart" },
 247         { RESTART_ACK,          "Restart_ack" },
 248         { STATUS,               "Status" },
 249         { STATUS_ENQ,           "Status_enquiry" },
 250         { ADD_PARTY,            "Add_party" },
 251         { ADD_PARTY_ACK,        "Add_party_ack" },
 252         { ADD_PARTY_REJ,        "Add_party_reject" },
 253         { DROP_PARTY,           "Drop_party" },
 254         { DROP_PARTY_ACK,       "Drop_party_ack" },
 255         { 0,                    NULL }
 256 };
 257
 258 static void
 259 sig_print(netdissect_options *ndo,
 260           const u_char *p, int caplen)
 261 {
 262         uint32_t call_ref;
 263
 264         if (caplen < PROTO_POS) {
 265                 ND_PRINT((ndo, "%s", tstr));
 266                 return;
 267         }
 268         if (p[PROTO_POS] == Q2931) {
 269                 /*
 270                  * protocol:Q.2931 for User to Network Interface
 271                  * (UNI 3.1) signalling
 272                  */
 273                 ND_PRINT((ndo, "Q.2931"));
 274                 if (caplen < MSG_TYPE_POS) {
 275                         ND_PRINT((ndo, " %s", tstr));
 276                         return;
 277                 }
 278                 ND_PRINT((ndo, ":%s ",
 279                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])));
 280
 281                 /*
 282                  * The call reference comes before the message type,
 283                  * so if we know we have the message type, which we
 284                  * do from the caplen test above, we also know we have
 285                  * the call reference.
 286                  */
 287                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 288                 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref));
 289         } else {
 290                 /* SCCOP with some unknown protocol atop it */
 291                 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS]));
 292         }
 293 }
 294
 295 /*
 296  * Print an ATM PDU (such as an AAL5 PDU).
 297  */
 298 void
 299 atm_print(netdissect_options *ndo,
 300           u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 301           u_int caplen)
 302 {
 303         if (ndo->ndo_eflag)
 304                 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci));
 305
 306         if (vpi == 0) {
 307                 switch (vci) {
 308
 309                 case VCI_PPC:
 310                         sig_print(ndo, p, caplen);
 311                         return;
 312
 313                 case VCI_BCC:
 314                         ND_PRINT((ndo, "broadcast sig: "));
 315                         return;
 316
 317                 case VCI_OAMF4SC: /* fall through */
 318                 case VCI_OAMF4EC:
 319                         oam_print(ndo, p, length, ATM_OAM_HEC);
 320                         return;
 321
 322                 case VCI_METAC:
 323                         ND_PRINT((ndo, "meta: "));
 324                         return;
 325
 326                 case VCI_ILMIC:
 327                         ND_PRINT((ndo, "ilmi: "));
 328                         snmp_print(ndo, p, length);
 329                         return;
 330                 }
 331         }
 332
 333         switch (traftype) {
 334
 335         case ATM_LLC:
 336         default:
 337                 /*
 338                  * Assumes traffic is LLC if unknown.
 339                  */
 340                 atm_llc_print(ndo, p, length, caplen);
 341                 break;
 342
 343         case ATM_LANE:
 344                 lane_print(ndo, p, length, caplen);
 345                 break;
 346         }
 347 }
 348
 349 struct oam_fm_loopback_t {
 350     uint8_t loopback_indicator;
 351     uint8_t correlation_tag[4];
 352     uint8_t loopback_id[12];
 353     uint8_t source_id[12];
 354     uint8_t unused[16];
 355 };
 356
 357 struct oam_fm_ais_rdi_t {
 358     uint8_t failure_type;
 359     uint8_t failure_location[16];
 360     uint8_t unused[28];
 361 };
 362
 363 int
 364 oam_print (netdissect_options *ndo,
 365            const u_char *p, u_int length, u_int hec)
 366 {
 367     uint32_t cell_header;
 368     uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
 369     uint8_t  cell_type, func_type, payload, clp;
 370
 371     union {
 372         const struct oam_fm_loopback_t *oam_fm_loopback;
 373         const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
 374     } oam_ptr;
 375
 376
 377     cell_header = EXTRACT_32BITS(p+hec);
 378     cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
 379     func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
 380
 381     vpi = (cell_header>>20)&0xff;
 382     vci = (cell_header>>4)&0xffff;
 383     payload = (cell_header>>1)&0x7;
 384     clp = cell_header&0x1;
 385
 386     ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
 387            tok2str(oam_f_values, "OAM F5", vci),
 388            vpi, vci,
 389            tok2str(atm_pty_values, "Unknown", payload),
 390            clp, length));
 391
 392     if (!ndo->ndo_vflag) {
 393         return 1;
 394     }
 395
 396     ND_PRINT((ndo, "\n\tcell-type %s (%u)",
 397            tok2str(oam_celltype_values, "unknown", cell_type),
 398            cell_type));
 399
 400     if (oam_functype_values[cell_type] == NULL)
 401         ND_PRINT((ndo, ", func-type unknown (%u)", func_type));
 402     else
 403         ND_PRINT((ndo, ", func-type %s (%u)",
 404                tok2str(oam_functype_values[cell_type],"none",func_type),
 405                func_type));
 406
 407     p += ATM_HDR_LEN_NOHEC + hec;
 408
 409     switch (cell_type << 4 | func_type) {
 410     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
 411         oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 412         ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
 413                tok2str(oam_fm_loopback_indicator_values,
 414                        "Unknown",
 415                        oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
 416                EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)));
 417         ND_PRINT((ndo, "\n\tLocation-ID "));
 418         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 419             if (idx % 2) {
 420                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])));
 421             }
 422         }
 423         ND_PRINT((ndo, "\n\tSource-ID   "));
 424         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 425             if (idx % 2) {
 426                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])));
 427             }
 428         }
 429         break;
 430
 431     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
 432     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
 433         oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
 434         ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type));
 435         ND_PRINT((ndo, "\n\tLocation-ID "));
 436         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 437             if (idx % 2) {
 438                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])));
 439             }
 440         }
 441         break;
 442
 443     case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
 444         /* FIXME */
 445         break;
 446
 447     default:
 448         break;
 449     }
 450
 451     /* crc10 checksum verification */
 452     cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
 453         & OAM_CRC10_MASK;
 454     cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
 455
 456     ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)",
 457            cksum,
 458            cksum_shouldbe == 0 ? "" : "in"));
 459
 460     return 1;
 461 }