contrib/tcpdump-3.9/print-llc.c

   1 /*
   2  * Copyright (c) 1992, 1993, 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  * Code by Matt Thomas, Digital Equipment Corporation
  22  *      with an awful lot of hacking by Jeffrey Mogul, DECWRL
  23  */
  24
  25 #ifndef lint
  26 static const char rcsid[] _U_ =
  27     "@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.61.2.10 2007/02/08 07:07:51 guy Exp $";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include <stdio.h>
  37 #include <string.h>
  38
  39 #include "interface.h"
  40 #include "addrtoname.h"
  41 #include "extract.h"                    /* must come after interface.h */
  42
  43 #include "llc.h"
  44 #include "ethertype.h"
  45 #include "oui.h"
  46
  47 static struct tok llc_values[] = {
  48         { LLCSAP_NULL,     "Null" },
  49         { LLCSAP_GLOBAL,   "Global" },
  50         { LLCSAP_8021B_I,  "802.1B I" },
  51         { LLCSAP_8021B_G,  "802.1B G" },
  52         { LLCSAP_IP,       "IP" },
  53         { LLCSAP_SNA,      "SNA" },
  54         { LLCSAP_PROWAYNM, "ProWay NM" },
  55         { LLCSAP_8021D,    "STP" },
  56         { LLCSAP_RS511,    "RS511" },
  57         { LLCSAP_ISO8208,  "ISO8208" },
  58         { LLCSAP_PROWAY,   "ProWay" },
  59         { LLCSAP_SNAP,     "SNAP" },
  60         { LLCSAP_IPX,      "IPX" },
  61         { LLCSAP_NETBEUI,  "NetBeui" },
  62         { LLCSAP_ISONS,    "OSI" },
  63         { 0,               NULL },
  64 };
  65
  66 static struct tok llc_cmd_values[] = {
  67         { LLC_UI,       "ui" },
  68         { LLC_TEST,     "test" },
  69         { LLC_XID,      "xid" },
  70         { LLC_UA,       "ua" },
  71         { LLC_DISC,     "disc" },
  72         { LLC_DM,       "dm" },
  73         { LLC_SABME,    "sabme" },
  74         { LLC_FRMR,     "frmr" },
  75         { 0,            NULL }
  76 };
  77
  78 static const struct tok llc_flag_values[] = {
  79         { 0, "Command" },
  80         { LLC_GSAP, "Response" },
  81         { LLC_U_POLL, "Poll" },
  82         { LLC_GSAP|LLC_U_POLL, "Final" },
  83         { LLC_IS_POLL, "Poll" },
  84         { LLC_GSAP|LLC_IS_POLL, "Final" },
  85         { 0, NULL }
  86 };
  87
  88
  89 static const struct tok llc_ig_flag_values[] = {
  90         { 0, "Individual" },
  91         { LLC_IG, "Group" },
  92         { 0, NULL }
  93 };
  94
  95
  96 static const struct tok llc_supervisory_values[] = {
  97         { 0, "Receiver Ready" },
  98         { 1, "Receiver not Ready" },
  99         { 2, "Reject" },
 100         { 0,             NULL }
 101 };
 102
 103
 104 static const struct tok cisco_values[] = {
 105         { PID_CISCO_CDP, "CDP" },
 106         { PID_CISCO_VTP, "VTP" },
 107         { PID_CISCO_DTP, "DTP" },
 108         { 0,             NULL }
 109 };
 110
 111 static const struct tok bridged_values[] = {
 112         { PID_RFC2684_ETH_FCS,     "Ethernet + FCS" },
 113         { PID_RFC2684_ETH_NOFCS,   "Ethernet w/o FCS" },
 114         { PID_RFC2684_802_4_FCS,   "802.4 + FCS" },
 115         { PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" },
 116         { PID_RFC2684_802_5_FCS,   "Token Ring + FCS" },
 117         { PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" },
 118         { PID_RFC2684_FDDI_FCS,    "FDDI + FCS" },
 119         { PID_RFC2684_FDDI_NOFCS,  "FDDI w/o FCS" },
 120         { PID_RFC2684_802_6_FCS,   "802.6 + FCS" },
 121         { PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" },
 122         { PID_RFC2684_BPDU,        "BPDU" },
 123         { 0,                       NULL },
 124 };
 125
 126 static const struct tok null_values[] = {
 127         { 0,             NULL }
 128 };
 129
 130 struct oui_tok {
 131         u_int32_t       oui;
 132         const struct tok *tok;
 133 };
 134
 135 static const struct oui_tok oui_to_tok[] = {
 136         { OUI_ENCAP_ETHER, ethertype_values },
 137         { OUI_CISCO_90, ethertype_values },     /* uses some Ethertype values */
 138         { OUI_APPLETALK, ethertype_values },    /* uses some Ethertype values */
 139         { OUI_CISCO, cisco_values },
 140         { OUI_RFC2684, bridged_values },        /* bridged, RFC 2427 FR or RFC 2864 ATM */
 141         { 0, NULL }
 142 };
 143
 144 /*
 145  * Returns non-zero IFF it succeeds in printing the header
 146  */
 147 int
 148 llc_print(const u_char *p, u_int length, u_int caplen,
 149           const u_char *esrc, const u_char *edst, u_short *extracted_ethertype)
 150 {
 151         u_int8_t dsap_field, dsap, ssap_field, ssap;
 152         u_int16_t control;
 153         int is_u;
 154         register int ret;
 155
 156         *extracted_ethertype = 0;
 157
 158         if (caplen < 3) {
 159                 (void)printf("[|llc]");
 160                 default_print((u_char *)p, caplen);
 161                 return(0);
 162         }
 163
 164         dsap_field = *p;
 165         ssap_field = *(p + 1);
 166
 167         /*
 168          * OK, what type of LLC frame is this?  The length
 169          * of the control field depends on that - I frames
 170          * have a two-byte control field, and U frames have
 171          * a one-byte control field.
 172          */
 173         control = *(p + 2);
 174         if ((control & LLC_U_FMT) == LLC_U_FMT) {
 175                 /*
 176                  * U frame.
 177                  */
 178                 is_u = 1;
 179         } else {
 180                 /*
 181                  * The control field in I and S frames is
 182                  * 2 bytes...
 183                  */
 184                 if (caplen < 4) {
 185                         (void)printf("[|llc]");
 186                         default_print((u_char *)p, caplen);
 187                         return(0);
 188                 }
 189
 190                 /*
 191                  * ...and is little-endian.
 192                  */
 193                 control = EXTRACT_LE_16BITS(p + 2);
 194                 is_u = 0;
 195         }
 196
 197         if (ssap_field == LLCSAP_GLOBAL && dsap_field == LLCSAP_GLOBAL) {
 198                 /*
 199                  * This is an Ethernet_802.3 IPX frame; it has an
 200                  * 802.3 header (i.e., an Ethernet header where the
 201                  * type/length field is <= ETHERMTU, i.e. it's a length
 202                  * field, not a type field), but has no 802.2 header -
 203                  * the IPX packet starts right after the Ethernet header,
 204                  * with a signature of two bytes of 0xFF (which is
 205                  * LLCSAP_GLOBAL).
 206                  *
 207                  * (It might also have been an Ethernet_802.3 IPX at
 208                  * one time, but got bridged onto another network,
 209                  * such as an 802.11 network; this has appeared in at
 210                  * least one capture file.)
 211                  */
 212
 213             if (eflag)
 214                 printf("IPX 802.3: ");
 215
 216             ipx_print(p, length);
 217             return (1);
 218         }
 219
 220         dsap = dsap_field & ~LLC_IG;
 221         ssap = ssap_field & ~LLC_GSAP;
 222
 223         if (eflag) {
 224                 printf("LLC, dsap %s (0x%02x) %s, ssap %s (0x%02x) %s",
 225                        tok2str(llc_values, "Unknown", dsap),
 226                        dsap,
 227                        tok2str(llc_ig_flag_values, "Unknown", dsap_field & LLC_IG),
 228                        tok2str(llc_values, "Unknown", ssap),
 229                        ssap,
 230                        tok2str(llc_flag_values, "Unknown", ssap_field & LLC_GSAP));
 231
 232                 if (is_u) {
 233                         printf(", ctrl 0x%02x: ", control);
 234                 } else {
 235                         printf(", ctrl 0x%04x: ", control);
 236                 }
 237         }
 238
 239         if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D &&
 240             control == LLC_UI) {
 241                 stp_print(p+3, length-3);
 242                 return (1);
 243         }
 244
 245         if (ssap == LLCSAP_IP && dsap == LLCSAP_IP &&
 246             control == LLC_UI) {
 247                 ip_print(gndo, p+4, length-4);
 248                 return (1);
 249         }
 250
 251         if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX &&
 252             control == LLC_UI) {
 253                 /*
 254                  * This is an Ethernet_802.2 IPX frame, with an 802.3
 255                  * header and an 802.2 LLC header with the source and
 256                  * destination SAPs being the IPX SAP.
 257                  *
 258                  * Skip DSAP, LSAP, and control field.
 259                  */
 260                 if (eflag)
 261                         printf("IPX 802.2: ");
 262
 263                 ipx_print(p+3, length-3);
 264                 return (1);
 265         }
 266
 267 #ifdef TCPDUMP_DO_SMB
 268         if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI
 269             && (!(control & LLC_S_FMT) || control == LLC_U_FMT)) {
 270                 /*
 271                  * we don't actually have a full netbeui parser yet, but the
 272                  * smb parser can handle many smb-in-netbeui packets, which
 273                  * is very useful, so we call that
 274                  *
 275                  * We don't call it for S frames, however, just I frames
 276                  * (which are frames that don't have the low-order bit,
 277                  * LLC_S_FMT, set in the first byte of the control field)
 278                  * and UI frames (whose control field is just 3, LLC_U_FMT).
 279                  */
 280
 281                 /*
 282                  * Skip the LLC header.
 283                  */
 284                 if (is_u) {
 285                         p += 3;
 286                         length -= 3;
 287                         caplen -= 3;
 288                 } else {
 289                         p += 4;
 290                         length -= 4;
 291                         caplen -= 4;
 292                 }
 293                 netbeui_print(control, p, length);
 294                 return (1);
 295         }
 296 #endif
 297         if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS
 298             && control == LLC_UI) {
 299                 isoclns_print(p + 3, length - 3, caplen - 3);
 300                 return (1);
 301         }
 302
 303         if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP
 304             && control == LLC_UI) {
 305                 /*
 306                  * XXX - what *is* the right bridge pad value here?
 307                  * Does anybody ever bridge one form of LAN traffic
 308                  * over a networking type that uses 802.2 LLC?
 309                  */
 310                 ret = snap_print(p+3, length-3, caplen-3, extracted_ethertype,
 311                     2);
 312                 if (ret)
 313                         return (ret);
 314         }
 315
 316         if (!eflag) {
 317                 if (ssap == dsap) {
 318                         if (esrc == NULL || edst == NULL)
 319                                 (void)printf("%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
 320                         else
 321                                 (void)printf("%s > %s %s ",
 322                                                 etheraddr_string(esrc),
 323                                                 etheraddr_string(edst),
 324                                                 tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
 325                 } else {
 326                         if (esrc == NULL || edst == NULL)
 327                                 (void)printf("%s > %s ",
 328                                         tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
 329                                         tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
 330                         else
 331                                 (void)printf("%s %s > %s %s ",
 332                                         etheraddr_string(esrc),
 333                                         tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
 334                                         etheraddr_string(edst),
 335                                         tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
 336                 }
 337         }
 338
 339         if (is_u) {
 340                 printf("Unnumbered, %s, Flags [%s], length %u",
 341                        tok2str(llc_cmd_values, "%02x", LLC_U_CMD(control)),
 342                        tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_U_POLL)),
 343                        length);
 344
 345                 p += 3;
 346                 length -= 3;
 347                 caplen -= 3;
 348
 349                 if ((control & ~LLC_U_POLL) == LLC_XID) {
 350                         if (*p == LLC_XID_FI) {
 351                                 printf(": %02x %02x", p[1], p[2]);
 352                                 p += 3;
 353                                 length -= 3;
 354                                 caplen -= 3;
 355                         }
 356                 }
 357         } else {
 358                 if ((control & LLC_S_FMT) == LLC_S_FMT) {
 359                         (void)printf("Supervisory, %s, rcv seq %u, Flags [%s], length %u",
 360                                 tok2str(llc_supervisory_values,"?",LLC_S_CMD(control)),
 361                                 LLC_IS_NR(control),
 362                                 tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
 363                                 length);
 364                 } else {
 365                         (void)printf("Information, send seq %u, rcv seq %u, Flags [%s], length %u",
 366                                 LLC_I_NS(control),
 367                                 LLC_IS_NR(control),
 368                                 tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
 369                                 length);
 370                 }
 371                 p += 4;
 372                 length -= 4;
 373                 caplen -= 4;
 374         }
 375         return(1);
 376 }
 377
 378 int
 379 snap_print(const u_char *p, u_int length, u_int caplen,
 380     u_short *extracted_ethertype, u_int bridge_pad)
 381 {
 382         u_int32_t orgcode;
 383         register u_short et;
 384         register int ret;
 385
 386         TCHECK2(*p, 5);
 387         orgcode = EXTRACT_24BITS(p);
 388         et = EXTRACT_16BITS(p + 3);
 389
 390         if (eflag) {
 391                 const struct tok *tok = null_values;
 392                 const struct oui_tok *otp;
 393
 394                 for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) {
 395                         if (otp->oui == orgcode) {
 396                                 tok = otp->tok;
 397                                 break;
 398                         }
 399                 }
 400                 (void)printf("oui %s (0x%06x), %s %s (0x%04x): ",
 401                      tok2str(oui_values, "Unknown", orgcode),
 402                      orgcode,
 403                      (orgcode == 0x000000 ? "ethertype" : "pid"),
 404                      tok2str(tok, "Unknown", et),
 405                      et);
 406         }
 407         p += 5;
 408         length -= 5;
 409         caplen -= 5;
 410
 411         switch (orgcode) {
 412         case OUI_ENCAP_ETHER:
 413         case OUI_CISCO_90:
 414                 /*
 415                  * This is an encapsulated Ethernet packet,
 416                  * or a packet bridged by some piece of
 417                  * Cisco hardware; the protocol ID is
 418                  * an Ethernet protocol type.
 419                  */
 420                 ret = ether_encap_print(et, p, length, caplen,
 421                     extracted_ethertype);
 422                 if (ret)
 423                         return (ret);
 424                 break;
 425
 426         case OUI_APPLETALK:
 427                 if (et == ETHERTYPE_ATALK) {
 428                         /*
 429                          * No, I have no idea why Apple used one
 430                          * of their own OUIs, rather than
 431                          * 0x000000, and an Ethernet packet
 432                          * type, for Appletalk data packets,
 433                          * but used 0x000000 and an Ethernet
 434                          * packet type for AARP packets.
 435                          */
 436                         ret = ether_encap_print(et, p, length, caplen,
 437                             extracted_ethertype);
 438                         if (ret)
 439                                 return (ret);
 440                 }
 441                 break;
 442
 443         case OUI_CISCO:
 444                 if (et == PID_CISCO_CDP) {
 445                         cdp_print(p, length, caplen);
 446                         return (1);
 447                 }
 448                 break;
 449
 450         case OUI_RFC2684:
 451                 switch (et) {
 452
 453                 case PID_RFC2684_ETH_FCS:
 454                 case PID_RFC2684_ETH_NOFCS:
 455                         /*
 456                          * XXX - remove the last two bytes for
 457                          * PID_RFC2684_ETH_FCS?
 458                          */
 459                         /*
 460                          * Skip the padding.
 461                          */
 462                         TCHECK2(*p, bridge_pad);
 463                         caplen -= bridge_pad;
 464                         length -= bridge_pad;
 465                         p += bridge_pad;
 466
 467                         /*
 468                          * What remains is an Ethernet packet.
 469                          */
 470                         ether_print(p, length, caplen);
 471                         return (1);
 472
 473                 case PID_RFC2684_802_5_FCS:
 474                 case PID_RFC2684_802_5_NOFCS:
 475                         /*
 476                          * XXX - remove the last two bytes for
 477                          * PID_RFC2684_ETH_FCS?
 478                          */
 479                         /*
 480                          * Skip the padding, but not the Access
 481                          * Control field.
 482                          */
 483                         TCHECK2(*p, bridge_pad);
 484                         caplen -= bridge_pad;
 485                         length -= bridge_pad;
 486                         p += bridge_pad;
 487
 488                         /*
 489                          * What remains is an 802.5 Token Ring
 490                          * packet.
 491                          */
 492                         token_print(p, length, caplen);
 493                         return (1);
 494
 495                 case PID_RFC2684_FDDI_FCS:
 496                 case PID_RFC2684_FDDI_NOFCS:
 497                         /*
 498                          * XXX - remove the last two bytes for
 499                          * PID_RFC2684_ETH_FCS?
 500                          */
 501                         /*
 502                          * Skip the padding.
 503                          */
 504                         TCHECK2(*p, bridge_pad + 1);
 505                         caplen -= bridge_pad + 1;
 506                         length -= bridge_pad + 1;
 507                         p += bridge_pad + 1;
 508
 509                         /*
 510                          * What remains is an FDDI packet.
 511                          */
 512                         fddi_print(p, length, caplen);
 513                         return (1);
 514
 515                 case PID_RFC2684_BPDU:
 516                         stp_print(p, length);
 517                         return (1);
 518                 }
 519         }
 520         return (0);
 521
 522 trunc:
 523         (void)printf("[|snap]");
 524         return (1);
 525 }
 526
 527
 528 /*
 529  * Local Variables:
 530  * c-style: whitesmith
 531  * c-basic-offset: 8
 532  * End:
 533  */