packet-llc.c

   1 /* packet-llc.c
   2  * Routines for IEEE 802.2 LLC layer
   3  * Gilbert Ramirez <gram@alumni.rice.edu>
   4  *
   5  * $Id: packet-llc.c,v 1.116 2003/10/01 07:11:44 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include "oui.h"
  33 #include "xdlc.h"
  34 #include "etypes.h"
  35 #include "llcsaps.h"
  36 #include "bridged_pids.h"
  37 #include "ppptypes.h"
  38 #include "arcnet_pids.h"
  39 #include "packet-fc.h"
  40 #include "packet-ip.h"
  41 #include "packet-ipx.h"
  42 #include "packet-netbios.h"
  43 #include "packet-vines.h"
  44 #include <epan/sna-utils.h>
  45
  46 #include "packet-llc.h"
  47
  48 #define UDP_PORT_LLC1   12000
  49 #define UDP_PORT_LLC2   12001
  50 #define UDP_PORT_LLC3   12002
  51 #define UDP_PORT_LLC4   12003
  52 #define UDP_PORT_LLC5   12004
  53
  54 static int proto_llc = -1;
  55 static int hf_llc_dsap = -1;
  56 static int hf_llc_ssap = -1;
  57 static int hf_llc_dsap_ig = -1;
  58 static int hf_llc_ssap_cr = -1;
  59 static int hf_llc_ctrl = -1;
  60 static int hf_llc_type = -1;
  61 static int hf_llc_oui = -1;
  62 static int hf_llc_pid = -1;
  63
  64 static gint ett_llc = -1;
  65 static gint ett_llc_ctrl = -1;
  66
  67 static dissector_table_t subdissector_table;
  68 static dissector_table_t xid_subdissector_table;
  69
  70 static dissector_handle_t bpdu_handle;
  71 static dissector_handle_t eth_handle;
  72 static dissector_handle_t fddi_handle;
  73 static dissector_handle_t tr_handle;
  74 static dissector_handle_t data_handle;
  75
  76 /*
  77  * Group/Individual bit, in the DSAP.
  78  */
  79 #define DSAP_GI_BIT     0x01
  80
  81 /*
  82  * Command/Response bit, in the SSAP.
  83  *
  84  * The low-order bit of the SSAP apparently determines whether this
  85  * is a request or a response.  (RFC 1390, "Transmission of IP and
  86  * ARP over FDDI Networks", says
  87  *
  88  *      Command frames are identified by having the low order
  89  *      bit of the SSAP address reset to zero.  Response frames
  90  *      have the low order bit of the SSAP address set to one.
  91  *
  92  * and a page I've seen seems to imply that's part of 802.2.)
  93  */
  94 #define SSAP_CR_BIT     0x01
  95
  96 /*
  97  * Mask to extrace the SAP number from the DSAP or the SSAP.
  98  */
  99 #define SAP_MASK        0xFE
 100
 101 /*
 102  * These are for SSAP and DSAP, wth last bit always zero.
 103  * XXX - some DSAPs come in separate "individual" and "group" versions,
 104  * with the last bit 0 and 1, respectively (e.g., LLC Sub-layer Management,
 105  * IBM SNA Path Control, IBM Net Management), but, whilst 0xFE is
 106  * the ISO Network Layer Protocol, 0xFF is the Global LSAP.
 107  */
 108 const value_string sap_vals[] = {
 109         { SAP_NULL,           "NULL LSAP" },
 110         { SAP_LLC_SLMGMT,     "LLC Sub-Layer Management" },
 111         { SAP_SNA_PATHCTRL,   "SNA Path Control" },
 112         { SAP_IP,             "TCP/IP" },
 113         { SAP_SNA1,           "SNA" },
 114         { SAP_SNA2,           "SNA" },
 115         { SAP_PROWAY_NM_INIT, "PROWAY (IEC955) Network Management and Initialization" },
 116         { SAP_NETWARE1,       "NetWare (unofficial?)" },
 117         { SAP_OSINL1,         "ISO Network Layer (OSLAN 1)" },
 118         { SAP_TI,             "Texas Instruments" },
 119         { SAP_OSINL2,         "ISO Network Layer (unofficial?)" },
 120         { SAP_OSINL3,         "ISO Network Layer (unofficial?)" },
 121         { SAP_BPDU,           "Spanning Tree BPDU" },
 122         { SAP_RS511,          "EIA RS-511 Manufacturing Message Service" },
 123         { SAP_OSINL4,         "ISO Network Layer (OSLAN 2)" },
 124         { SAP_X25,            "ISO 8208 (X.25 over 802.2)" },
 125         /*
 126          * XXX - setting the group bit of SAP_X25 make 0x7F; is this just
 127          * a group version of that?
 128          */
 129         { 0x7F,               "ISO 802.2" },
 130         { SAP_XNS,            "XNS" },
 131         { SAP_BACNET,         "BACnet" },
 132         { SAP_NESTAR,         "Nestar" },
 133         { SAP_PROWAY_ASLM,    "PROWAY (IEC955) Active Station List Maintenance" },
 134         { SAP_ARP,            "ARP" },  /* XXX - hand to "dissect_arp()"? */
 135         { SAP_SNAP,           "SNAP" },
 136         { SAP_VINES1,         "Banyan Vines" },
 137         { SAP_VINES2,         "Banyan Vines" },
 138         { SAP_NETWARE2,       "NetWare" },
 139         { SAP_NETBIOS,        "NetBIOS" },
 140         { SAP_IBMNM,          "IBM Net Management" },
 141         { SAP_HPEXT,          "HP Extended LLC" },
 142         { SAP_UB,             "Ungermann-Bass" },
 143         { SAP_RPL,            "Remote Program Load" },
 144         { SAP_OSINL5,         "ISO Network Layer" },
 145         { SAP_GLOBAL,         "Global LSAP" },
 146         { 0x00,               NULL }
 147 };
 148
 149 /*
 150  * See
 151  *
 152  * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/vlan.htm
 153  *
 154  * for the PIDs for VTP and DRiP that go with an OUI of OUI_CISCO.
 155  */
 156 const value_string oui_vals[] = {
 157         { OUI_ENCAP_ETHER, "Encapsulated Ethernet" },
 158 /*
 159 http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/ibm_r/brprt1/brsrb.htm
 160 */
 161         { OUI_CISCO,       "Cisco" },
 162         { OUI_CISCO_90,    "Cisco IOS 9.0 Compatible" },
 163         { OUI_BRIDGED,     "Frame Relay or ATM bridged frames" },
 164                                 /* RFC 2427, RFC 2684 */
 165         { OUI_ATM_FORUM,   "ATM Forum" },
 166         { OUI_CABLE_BPDU,  "DOCSIS Spanning Tree" }, /* DOCSIS spanning tree BPDU */
 167         { OUI_APPLE_ATALK, "Apple (AppleTalk)" },
 168         { OUI_NORTEL,      "Nortel Networks SONMP" },
 169         { 0,               NULL }
 170 };
 171
 172 /*
 173  * Hash table for translating OUIs to a dissector table/field info pair;
 174  * the dissector table maps PID values to dissectors, and the field
 175  * corresponds to the PID for that OUI.
 176  */
 177 typedef struct {
 178         dissector_table_t table;
 179         hf_register_info *field_info;
 180 } oui_info_t;
 181
 182 static GHashTable *oui_info_table = NULL;
 183
 184 /*
 185  * Add an entry for a new OUI.
 186  */
 187 void
 188 llc_add_oui(guint32 oui, const char *table_name, char *table_ui_name,
 189     hf_register_info *hf_item)
 190 {
 191         oui_info_t *new_info;
 192
 193         new_info = g_malloc(sizeof (oui_info_t));
 194         new_info->table = register_dissector_table(table_name,
 195             table_ui_name, FT_UINT16, BASE_HEX);
 196         new_info->field_info = hf_item;
 197
 198         /*
 199          * Create the hash table for OUI information, if it doesn't
 200          * already exist.
 201          */
 202         if (oui_info_table == NULL) {
 203                 oui_info_table = g_hash_table_new(g_direct_hash,
 204                     g_direct_equal);
 205         }
 206         g_hash_table_insert(oui_info_table, (gpointer)oui, new_info);
 207 }
 208
 209 void
 210 capture_llc(const guchar *pd, int offset, int len, packet_counts *ld) {
 211
 212         int             is_snap;
 213         guint16         control;
 214         int             llc_header_len;
 215         guint32         oui;
 216         guint16         etype;
 217
 218         if (!BYTES_ARE_IN_FRAME(offset, len, 2)) {
 219                 ld->other++;
 220                 return;
 221         }
 222         is_snap = (pd[offset] == SAP_SNAP) && (pd[offset+1] == SAP_SNAP);
 223         llc_header_len = 2;     /* DSAP + SSAP */
 224
 225         /*
 226          * XXX - the page referred to in the comment above about the
 227          * Command/Response bit also implies that LLC Type 2 always
 228          * uses extended operation, so we don't need to determine
 229          * whether it's basic or extended operation; is that the case?
 230          */
 231         control = get_xdlc_control(pd, offset+2, pd[offset+1] & SSAP_CR_BIT);
 232         llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
 233         if (is_snap)
 234                 llc_header_len += 5;    /* 3 bytes of OUI, 2 bytes of protocol ID */
 235         if (!BYTES_ARE_IN_FRAME(offset, len, llc_header_len)) {
 236                 ld->other++;
 237                 return;
 238         }
 239
 240         if (is_snap) {
 241                 oui = pd[offset+3] << 16 | pd[offset+4] << 8 | pd[offset+5];
 242                 if (XDLC_IS_INFORMATION(control)) {
 243                         etype = pntohs(&pd[offset+6]);
 244                         switch (oui) {
 245
 246                         case OUI_ENCAP_ETHER:
 247                         case OUI_CISCO_90:
 248                         case OUI_APPLE_ATALK:
 249                                 /* No, I have no idea why Apple used
 250                                    one of their own OUIs, rather than
 251                                    OUI_ENCAP_ETHER, and an Ethernet
 252                                    packet type as protocol ID, for
 253                                    AppleTalk data packets - but used
 254                                    OUI_ENCAP_ETHER and an Ethernet
 255                                    packet type for AARP packets. */
 256                                 capture_ethertype(etype, pd, offset+8, len,
 257                                     ld);
 258                                 break;
 259                         case OUI_CISCO:
 260                                 capture_ethertype(etype, pd, offset + 8, len,
 261                                     ld);
 262                                 break;
 263                         default:
 264                                 ld->other++;
 265                                 break;
 266                         }
 267                 }
 268         }
 269         else {
 270                 /* non-SNAP */
 271                 if (XDLC_IS_INFORMATION(control)) {
 272                         switch (pd[offset]) {
 273
 274                         case SAP_IP:
 275                                 capture_ip(pd, offset + llc_header_len, len,
 276                                     ld);
 277                                 break;
 278
 279                         case SAP_NETWARE1:
 280                         case SAP_NETWARE2:
 281                                 capture_ipx(ld);
 282                                 break;
 283
 284                         case SAP_NETBIOS:
 285                                 capture_netbios(ld);
 286                                 break;
 287
 288                         case SAP_VINES1:
 289                         case SAP_VINES2:
 290                                 capture_vines(ld);
 291                                 break;
 292
 293                         default:
 294                                 ld->other++;
 295                                 break;
 296                         }
 297                 }
 298         }
 299 }
 300
 301 static void
 302 dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 303 {
 304         proto_tree      *llc_tree = NULL;
 305         proto_item      *ti = NULL;
 306         int             is_snap;
 307         guint16         control;
 308         int             llc_header_len;
 309         guint8          dsap, ssap;
 310         tvbuff_t        *next_tvb;
 311
 312         if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
 313                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLC");
 314         }
 315         if (check_col(pinfo->cinfo, COL_INFO)) {
 316                 col_clear(pinfo->cinfo, COL_INFO);
 317         }
 318
 319         dsap = tvb_get_guint8(tvb, 0);
 320         if (tree) {
 321                 ti = proto_tree_add_item(tree, proto_llc, tvb, 0, -1, FALSE);
 322                 llc_tree = proto_item_add_subtree(ti, ett_llc);
 323                 proto_tree_add_uint(llc_tree, hf_llc_dsap, tvb, 0,
 324                         1, dsap & SAP_MASK);
 325                 proto_tree_add_boolean(llc_tree, hf_llc_dsap_ig, tvb, 0,
 326                         1, dsap & DSAP_GI_BIT);
 327         } else
 328                 llc_tree = NULL;
 329
 330         ssap = tvb_get_guint8(tvb, 1);
 331         if (tree) {
 332                 proto_tree_add_uint(llc_tree, hf_llc_ssap, tvb, 1,
 333                         1, ssap & SAP_MASK);
 334                 proto_tree_add_boolean(llc_tree, hf_llc_ssap_cr, tvb, 1,
 335                         1, ssap & SSAP_CR_BIT);
 336         } else
 337                 llc_tree = NULL;
 338
 339         is_snap = (dsap == SAP_SNAP) && (ssap == SAP_SNAP);
 340         llc_header_len = 2;     /* DSAP + SSAP */
 341
 342         /*
 343          * XXX - the page referred to in the comment above about the
 344          * Command/Response bit also implies that LLC Type 2 always
 345          * uses extended operation, so we don't need to determine
 346          * whether it's basic or extended operation; is that the case?
 347          */
 348         control = dissect_xdlc_control(tvb, 2, pinfo, llc_tree,
 349                                 hf_llc_ctrl, ett_llc_ctrl,
 350                                 ssap & SSAP_CR_BIT, TRUE, FALSE);
 351         llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
 352         if (is_snap)
 353                 llc_header_len += 5;    /* 3 bytes of OUI, 2 bytes of protocol ID */
 354
 355         if (tree)
 356                 proto_item_set_len(ti, llc_header_len);
 357
 358         if (is_snap) {
 359                 dissect_snap(tvb, 3, pinfo, tree, llc_tree, control,
 360                     hf_llc_oui, hf_llc_type, hf_llc_pid, 2);
 361         }
 362         else {
 363                 if (check_col(pinfo->cinfo, COL_INFO)) {
 364                         col_append_fstr(pinfo->cinfo, COL_INFO,
 365                             "; DSAP %s %s, SSAP %s %s",
 366                             val_to_str(dsap & SAP_MASK, sap_vals, "%02x"),
 367                             dsap & DSAP_GI_BIT ?
 368                               "Group" : "Individual",
 369                             val_to_str(ssap & SAP_MASK, sap_vals, "%02x"),
 370                             ssap & SSAP_CR_BIT ?
 371                               "Response" : "Command"
 372                         );
 373                 }
 374
 375                 if (tvb_length_remaining(tvb, llc_header_len) > 0) {
 376                         next_tvb = tvb_new_subset(tvb, llc_header_len, -1, -1);
 377                         if (XDLC_IS_INFORMATION(control)) {
 378                                 /*
 379                                  * Non-SNAP I or UI frame.
 380                                  * Try the regular LLC subdissector table
 381                                  * with the DSAP.
 382                                  */
 383                                 if (!dissector_try_port(subdissector_table,
 384                                     dsap, next_tvb, pinfo, tree)) {
 385                                         call_dissector(data_handle, next_tvb,
 386                                             pinfo, tree);
 387                                 }
 388                         } else if ((control & (XDLC_U_MODIFIER_MASK|XDLC_U))
 389                             == (XDLC_XID|XDLC_U)) {
 390                                 /*
 391                                  * Non-SNAP XID frame.
 392                                  * Try the XID LLC subdissector table
 393                                  * with the DSAP.
 394                                  */
 395                                 if (!dissector_try_port(xid_subdissector_table,
 396                                     dsap, next_tvb, pinfo, tree)) {
 397                                         call_dissector(data_handle, next_tvb,
 398                                             pinfo, tree);
 399                                 }
 400                         } else {
 401                                 call_dissector(data_handle, next_tvb, pinfo,
 402                                     tree);
 403                         }
 404                 }
 405         }
 406 }
 407
 408 /*
 409  * Dissect SNAP header; used elsewhere, e.g. in the Frame Relay dissector.
 410  */
 411 void
 412 dissect_snap(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
 413     proto_tree *snap_tree, int control, int hf_oui, int hf_type, int hf_pid,
 414     int bridge_pad)
 415 {
 416         guint32         oui;
 417         guint16         etype;
 418         tvbuff_t        *next_tvb;
 419         oui_info_t      *oui_info;
 420         dissector_table_t subdissector_table;
 421         int             hf;
 422
 423         oui =   tvb_get_ntoh24(tvb, offset);
 424         etype = tvb_get_ntohs(tvb, offset+3);
 425
 426         if (check_col(pinfo->cinfo, COL_INFO)) {
 427                 col_append_fstr(pinfo->cinfo, COL_INFO,
 428                     "; SNAP, OUI 0x%06X (%s), PID 0x%04X",
 429                     oui, val_to_str(oui, oui_vals, "Unknown"), etype);
 430         }
 431         if (tree) {
 432                 proto_tree_add_uint(snap_tree, hf_oui, tvb, offset, 3, oui);
 433         }
 434
 435         switch (oui) {
 436
 437         case OUI_ENCAP_ETHER:
 438         case OUI_CISCO_90:
 439         case OUI_APPLE_ATALK:
 440                 /* No, I have no idea why Apple used
 441                    one of their own OUIs, rather than
 442                    OUI_ENCAP_ETHER, and an Ethernet
 443                    packet type as protocol ID, for
 444                    AppleTalk data packets - but used
 445                    OUI_ENCAP_ETHER and an Ethernet
 446                    packet type for AARP packets. */
 447                 if (XDLC_IS_INFORMATION(control)) {
 448                         ethertype(etype, tvb, offset+5,
 449                             pinfo, tree, snap_tree, hf_type, -1, 0);
 450                 } else {
 451                         next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
 452                         call_dissector(data_handle,next_tvb, pinfo, tree);
 453                 }
 454                 break;
 455
 456         case OUI_BRIDGED:
 457                 /*
 458                  * MAC frames bridged over ATM (RFC 2684) or Frame Relay
 459                  * (RFC 2427).
 460                  *
 461                  * We have to figure out how much padding to put
 462                  * into the frame.  We were handed a "bridge_pad"
 463                  * argument which should be 0 for Frame Relay and
 464                  * 2 for ATM; we add to that the amount of padding
 465                  * common to both bridging types.
 466                  */
 467                 if (tree) {
 468                         proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
 469                             etype);
 470                 }
 471
 472                 switch (etype) {
 473
 474                 case BPID_ETH_WITH_FCS:
 475                 case BPID_ETH_WITHOUT_FCS:
 476                         next_tvb = tvb_new_subset(tvb, offset+5+bridge_pad,
 477                             -1, -1);
 478                         call_dissector(eth_handle, next_tvb, pinfo, tree);
 479                         break;
 480
 481                 case BPID_802_5_WITH_FCS:
 482                 case BPID_802_5_WITHOUT_FCS:
 483                         /*
 484                          * We treat the last padding byte as the Access
 485                          * Control byte, as that's what the Token
 486                          * Ring dissector expects the first byte to
 487                          * be.
 488                          */
 489                         next_tvb = tvb_new_subset(tvb, offset+5+bridge_pad,
 490                             -1, -1);
 491                         call_dissector(tr_handle, next_tvb, pinfo, tree);
 492                         break;
 493
 494                 case BPID_FDDI_WITH_FCS:
 495                 case BPID_FDDI_WITHOUT_FCS:
 496                         next_tvb = tvb_new_subset(tvb, offset+5+1+bridge_pad,
 497                             -1, -1);
 498                         call_dissector(fddi_handle, next_tvb, pinfo, tree);
 499                         break;
 500
 501                 case BPID_BPDU:
 502                         next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
 503                         call_dissector(bpdu_handle, next_tvb, pinfo, tree);
 504                         break;
 505
 506                 default:
 507                         next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
 508                         call_dissector(data_handle,next_tvb, pinfo, tree);
 509                         break;
 510                 }
 511                 break;
 512
 513         case OUI_CABLE_BPDU:    /* DOCSIS cable modem spanning tree BPDU */
 514                 if (tree) {
 515                         proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
 516                             etype);
 517                 }
 518                 next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
 519                 call_dissector(bpdu_handle, next_tvb, pinfo, tree);
 520                 break;
 521
 522         default:
 523                 /*
 524                  * Do we have information for this OUI?
 525                  */
 526                 oui_info = g_hash_table_lookup(oui_info_table, (gpointer)oui);
 527                 if (oui_info != NULL) {
 528                         /*
 529                          * Yes - use it.
 530                          */
 531                         hf = *oui_info->field_info->p_id;
 532                         subdissector_table = oui_info->table;
 533                 } else {
 534                         /*
 535                          * No, use hf_pid for the PID and just dissect
 536                          * the payload as data.
 537                          */
 538                         hf = hf_pid;
 539                         subdissector_table = NULL;
 540                 }
 541                 if (tree) {
 542                         proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2,
 543                             etype);
 544                 }
 545                 next_tvb = tvb_new_subset(tvb, offset+5, -1, -1);
 546                 if (XDLC_IS_INFORMATION(control)) {
 547                         if (subdissector_table != NULL) {
 548                                 /* do lookup with the subdissector table */
 549                                 if (dissector_try_port(subdissector_table,
 550                                     etype, next_tvb, pinfo, tree))
 551                                         break;
 552                         }
 553                 }
 554                 call_dissector(data_handle, next_tvb, pinfo, tree);
 555                 break;
 556         }
 557 }
 558
 559 void
 560 proto_register_llc(void)
 561 {
 562         static struct true_false_string ig_bit = { "Group", "Individual" };
 563         static struct true_false_string cr_bit = { "Response", "Command" };
 564
 565         static hf_register_info hf[] = {
 566                 { &hf_llc_dsap,
 567                 { "DSAP",       "llc.dsap", FT_UINT8, BASE_HEX,
 568                         VALS(sap_vals), 0x0, "", HFILL }},
 569
 570                 { &hf_llc_dsap_ig,
 571                 { "IG Bit",     "llc.dsap.ig", FT_BOOLEAN, BASE_HEX,
 572                         &ig_bit, 0x0, "Individual/Group", HFILL }},
 573
 574                 { &hf_llc_ssap,
 575                 { "SSAP", "llc.ssap", FT_UINT8, BASE_HEX,
 576                         VALS(sap_vals), 0x0, "", HFILL }},
 577
 578                 { &hf_llc_ssap_cr,
 579                 { "CR Bit", "llc.ssap.cr", FT_BOOLEAN, BASE_HEX,
 580                         &cr_bit, 0x0, "Command/Response", HFILL }},
 581
 582                 { &hf_llc_ctrl,
 583                 { "Control", "llc.control", FT_UINT16, BASE_HEX,
 584                         NULL, 0x0, "", HFILL }},
 585
 586                 /* registered here but handled in ethertype.c */
 587                 { &hf_llc_type,
 588                 { "Type", "llc.type", FT_UINT16, BASE_HEX,
 589                         VALS(etype_vals), 0x0, "", HFILL }},
 590
 591                 { &hf_llc_oui,
 592                 { "Organization Code",  "llc.oui", FT_UINT24, BASE_HEX,
 593                         VALS(oui_vals), 0x0, "", HFILL }},
 594
 595                 { &hf_llc_pid,
 596                 { "Protocol ID", "llc.pid", FT_UINT16, BASE_HEX,
 597                         NULL, 0x0, "", HFILL }}
 598         };
 599         static gint *ett[] = {
 600                 &ett_llc,
 601                 &ett_llc_ctrl,
 602         };
 603
 604         proto_llc = proto_register_protocol("Logical-Link Control", "LLC", "llc");
 605         proto_register_field_array(proto_llc, hf, array_length(hf));
 606         proto_register_subtree_array(ett, array_length(ett));
 607
 608 /* subdissector code */
 609         subdissector_table = register_dissector_table("llc.dsap",
 610           "LLC SAP", FT_UINT8, BASE_HEX);
 611         xid_subdissector_table = register_dissector_table("llc.xid_dsap",
 612           "LLC XID SAP", FT_UINT8, BASE_HEX);
 613
 614         register_dissector("llc", dissect_llc, proto_llc);
 615 }
 616
 617 static void
 618 register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
 619 {
 620         oui_info_t *info = value;
 621
 622         proto_register_field_array(proto_llc, info->field_info, 1);
 623 }
 624
 625 void
 626 proto_reg_handoff_llc(void)
 627 {
 628         dissector_handle_t llc_handle;
 629
 630         /*
 631          * Get handles for the BPDU, Ethernet, FDDI, and Token Ring
 632          * dissectors.
 633          */
 634         bpdu_handle = find_dissector("bpdu");
 635         eth_handle = find_dissector("eth");
 636         fddi_handle = find_dissector("fddi");
 637         tr_handle = find_dissector("tr");
 638         data_handle = find_dissector("data");
 639
 640         llc_handle = find_dissector("llc");
 641         dissector_add("wtap_encap", WTAP_ENCAP_ATM_RFC1483, llc_handle);
 642         /* RFC 2043 */
 643         dissector_add("ppp.protocol", PPP_LLC, llc_handle);
 644         /* RFC 2353 */
 645         dissector_add("udp.port", UDP_PORT_LLC1, llc_handle);
 646         dissector_add("udp.port", UDP_PORT_LLC2, llc_handle);
 647         dissector_add("udp.port", UDP_PORT_LLC3, llc_handle);
 648         dissector_add("udp.port", UDP_PORT_LLC4, llc_handle);
 649         dissector_add("udp.port", UDP_PORT_LLC5, llc_handle);
 650         /* IP-over-FC when we have the full FC frame */
 651         dissector_add("fc.ftype", FC_FTYPE_IP, llc_handle);
 652
 653         /*
 654          * BACNET-over-ARCNET is really BACNET-over-802.2 LLC-over-ARCNET,
 655          * apparently.
 656          */
 657         dissector_add("arcnet.protocol_id", ARCNET_PROTO_BACNET, llc_handle);
 658
 659         /*
 660          * Register all the fields for PIDs for various OUIs.
 661          */
 662         g_hash_table_foreach(oui_info_table, register_hf, NULL);
 663 }