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 < 8) {
 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          * Extract the presumed LLC header into a variable, for quick
 183          * testing.
 184          * Then check for a header that's neither a header for a SNAP
 185          * packet nor an RFC 2684 routed NLPID-formatted PDU nor
 186          * an 802.2-but-no-SNAP IP packet.
 187          */
 188         llchdr = EXTRACT_24BITS(p);
 189         if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
 190             llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
 191             llchdr != LLC_UI_HDR(LLCSAP_IP)) {
 192                 /*
 193                  * XXX - assume 802.6 MAC header from Fore driver.
 194                  *
 195                  * Unfortunately, the above list doesn't check for
 196                  * all known SAPs, doesn't check for headers where
 197                  * the source and destination SAP aren't the same,
 198                  * and doesn't check for non-UI frames.  It also
 199                  * runs the risk of an 802.6 MAC header that happens
 200                  * to begin with one of those values being
 201                  * incorrectly treated as an 802.2 header.
 202                  *
 203                  * So is that Fore driver still around?  And, if so,
 204                  * is it still putting 802.6 MAC headers on ATM
 205                  * packets?  If so, could it be changed to use a
 206                  * new DLT_IEEE802_6 value if we added it?
 207                  */
 208                 if (ndo->ndo_eflag)
 209                         ND_PRINT((ndo, "%08x%08x %08x%08x ",
 210                                EXTRACT_32BITS(p),
 211                                EXTRACT_32BITS(p+4),
 212                                EXTRACT_32BITS(p+8),
 213                                EXTRACT_32BITS(p+12)));
 214                 p += 20;
 215                 length -= 20;
 216                 caplen -= 20;
 217                 hdrlen += 20;
 218         }
 219         atm_llc_print(ndo, p, length, caplen);
 220         return (hdrlen);
 221 }
 222
 223 /*
 224  * ATM signalling.
 225  */
 226 static const struct tok msgtype2str[] = {
 227         { CALL_PROCEED,         "Call_proceeding" },
 228         { CONNECT,              "Connect" },
 229         { CONNECT_ACK,          "Connect_ack" },
 230         { SETUP,                "Setup" },
 231         { RELEASE,              "Release" },
 232         { RELEASE_DONE,         "Release_complete" },
 233         { RESTART,              "Restart" },
 234         { RESTART_ACK,          "Restart_ack" },
 235         { STATUS,               "Status" },
 236         { STATUS_ENQ,           "Status_enquiry" },
 237         { ADD_PARTY,            "Add_party" },
 238         { ADD_PARTY_ACK,        "Add_party_ack" },
 239         { ADD_PARTY_REJ,        "Add_party_reject" },
 240         { DROP_PARTY,           "Drop_party" },
 241         { DROP_PARTY_ACK,       "Drop_party_ack" },
 242         { 0,                    NULL }
 243 };
 244
 245 static void
 246 sig_print(netdissect_options *ndo,
 247           const u_char *p, int caplen)
 248 {
 249         uint32_t call_ref;
 250
 251         if (caplen < PROTO_POS) {
 252                 ND_PRINT((ndo, "%s", tstr));
 253                 return;
 254         }
 255         if (p[PROTO_POS] == Q2931) {
 256                 /*
 257                  * protocol:Q.2931 for User to Network Interface
 258                  * (UNI 3.1) signalling
 259                  */
 260                 ND_PRINT((ndo, "Q.2931"));
 261                 if (caplen < MSG_TYPE_POS) {
 262                         ND_PRINT((ndo, " %s", tstr));
 263                         return;
 264                 }
 265                 ND_PRINT((ndo, ":%s ",
 266                     tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])));
 267
 268                 /*
 269                  * The call reference comes before the message type,
 270                  * so if we know we have the message type, which we
 271                  * do from the caplen test above, we also know we have
 272                  * the call reference.
 273                  */
 274                 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
 275                 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref));
 276         } else {
 277                 /* SCCOP with some unknown protocol atop it */
 278                 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS]));
 279         }
 280 }
 281
 282 /*
 283  * Print an ATM PDU (such as an AAL5 PDU).
 284  */
 285 void
 286 atm_print(netdissect_options *ndo,
 287           u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
 288           u_int caplen)
 289 {
 290         if (ndo->ndo_eflag)
 291                 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci));
 292
 293         if (vpi == 0) {
 294                 switch (vci) {
 295
 296                 case VCI_PPC:
 297                         sig_print(ndo, p, caplen);
 298                         return;
 299
 300                 case VCI_BCC:
 301                         ND_PRINT((ndo, "broadcast sig: "));
 302                         return;
 303
 304                 case VCI_OAMF4SC: /* fall through */
 305                 case VCI_OAMF4EC:
 306                         oam_print(ndo, p, length, ATM_OAM_HEC);
 307                         return;
 308
 309                 case VCI_METAC:
 310                         ND_PRINT((ndo, "meta: "));
 311                         return;
 312
 313                 case VCI_ILMIC:
 314                         ND_PRINT((ndo, "ilmi: "));
 315                         snmp_print(ndo, p, length);
 316                         return;
 317                 }
 318         }
 319
 320         switch (traftype) {
 321
 322         case ATM_LLC:
 323         default:
 324                 /*
 325                  * Assumes traffic is LLC if unknown.
 326                  */
 327                 atm_llc_print(ndo, p, length, caplen);
 328                 break;
 329
 330         case ATM_LANE:
 331                 lane_print(ndo, p, length, caplen);
 332                 break;
 333         }
 334 }
 335
 336 struct oam_fm_loopback_t {
 337     uint8_t loopback_indicator;
 338     uint8_t correlation_tag[4];
 339     uint8_t loopback_id[12];
 340     uint8_t source_id[12];
 341     uint8_t unused[16];
 342 };
 343
 344 struct oam_fm_ais_rdi_t {
 345     uint8_t failure_type;
 346     uint8_t failure_location[16];
 347     uint8_t unused[28];
 348 };
 349
 350 int
 351 oam_print (netdissect_options *ndo,
 352            const u_char *p, u_int length, u_int hec) {
 353
 354     uint32_t cell_header;
 355     uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
 356     uint8_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     ND_PRINT((ndo, "%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 (!ndo->ndo_vflag) {
 380         return 1;
 381     }
 382
 383     ND_PRINT((ndo, "\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         ND_PRINT((ndo, ", func-type unknown (%u)", func_type));
 389     else
 390         ND_PRINT((ndo, ", 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         ND_PRINT((ndo, "\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         ND_PRINT((ndo, "\n\tLocation-ID "));
 405         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
 406             if (idx % 2) {
 407                 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])));
 408             }
 409         }
 410         ND_PRINT((ndo, "\n\tSource-ID   "));
 411         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
 412             if (idx % 2) {
 413                 ND_PRINT((ndo, "%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         ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type));
 422         ND_PRINT((ndo, "\n\tLocation-ID "));
 423         for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
 424             if (idx % 2) {
 425                 ND_PRINT((ndo, "%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     ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)",
 444            cksum,
 445            cksum_shouldbe == 0 ? "" : "in"));
 446
 447     return 1;
 448 }