epan/dissectors/packet-rx.c

   1 /* packet-rx.c
   2  * Routines for RX packet dissection
   3  * Copyright 1999, Nathan Neulinger <nneul@umr.edu>
   4  * Based on routines from tcpdump patches by
   5  *   Ken Hornstein <kenh@cmf.nrl.navy.mil>
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * Copied from packet-tftp.c
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <stdio.h>
  35
  36 #include <string.h>
  37 #include <glib.h>
  38 #include <epan/packet.h>
  39 #include "packet-rx.h"
  40 #include <epan/addr_resolv.h>
  41
  42 /*
  43  * See
  44  *
  45  *      http://web.mit.edu/kolya/afs/rx/rx-spec
  46  *
  47  * XXX - is the "Epoch" really a UN*X time?  The high-order bit, according
  48  * to that spec, is a flag bit.
  49  */
  50
  51 #define UDP_PORT_RX_LOW         7000
  52 #define UDP_PORT_RX_HIGH        7009
  53 #define UDP_PORT_RX_AFS_BACKUPS 7021
  54
  55 static const value_string rx_types[] = {
  56         { RX_PACKET_TYPE_DATA,          "data" },
  57         { RX_PACKET_TYPE_ACK,           "ack" },
  58         { RX_PACKET_TYPE_BUSY,          "busy" },
  59         { RX_PACKET_TYPE_ABORT,         "abort" },
  60         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  61         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  62         { RX_PACKET_TYPE_RESPONSE,      "response" },
  63         { RX_PACKET_TYPE_DEBUG,         "debug" },
  64         { RX_PACKET_TYPE_PARAMS,        "params" },
  65         { RX_PACKET_TYPE_VERSION,       "version" },
  66         { 0,                            NULL },
  67 };
  68
  69 static const value_string rx_reason[] = {
  70         { RX_ACK_REQUESTED,             "Ack Requested"         },
  71         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  72         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  73         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  74         { RX_ACK_NOSPACE,               "No Space"              },
  75         { RX_ACK_PING,                  "Ping"                  },
  76         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  77         { RX_ACK_DELAY,                 "Delay"                 },
  78         { RX_ACK_IDLE,                  "Idle"                  },
  79         { 0,                            NULL                    }
  80 };
  81
  82 static const value_string rx_ack_type[] = {
  83         { RX_ACK_TYPE_NACK,     "NACK"  },
  84         { RX_ACK_TYPE_ACK,      "ACK"   },
  85         { 0,                    NULL    }
  86 };
  87
  88 static int proto_rx = -1;
  89 static int hf_rx_epoch = -1;
  90 static int hf_rx_cid = -1;
  91 static int hf_rx_seq = -1;
  92 static int hf_rx_serial = -1;
  93 static int hf_rx_callnumber = -1;
  94 static int hf_rx_type = -1;
  95 static int hf_rx_flags = -1;
  96 static int hf_rx_flags_clientinit = -1;
  97 static int hf_rx_flags_request_ack = -1;
  98 static int hf_rx_flags_last_packet = -1;
  99 static int hf_rx_flags_more_packets = -1;
 100 static int hf_rx_flags_free_packet = -1;
 101 static int hf_rx_userstatus = -1;
 102 static int hf_rx_securityindex = -1;
 103 static int hf_rx_spare = -1;
 104 static int hf_rx_serviceid = -1;
 105 static int hf_rx_bufferspace = -1;
 106 static int hf_rx_maxskew = -1;
 107 static int hf_rx_first_packet = -1;
 108 static int hf_rx_prev_packet = -1;
 109 static int hf_rx_reason = -1;
 110 static int hf_rx_numacks = -1;
 111 static int hf_rx_ack_type = -1;
 112 static int hf_rx_ack = -1;
 113 static int hf_rx_challenge = -1;
 114 static int hf_rx_version = -1;
 115 static int hf_rx_nonce = -1;
 116 static int hf_rx_inc_nonce = -1;
 117 static int hf_rx_min_level = -1;
 118 static int hf_rx_level = -1;
 119 static int hf_rx_response = -1;
 120 static int hf_rx_encrypted = -1;
 121 static int hf_rx_kvno = -1;
 122 static int hf_rx_ticket_len = -1;
 123 static int hf_rx_ticket = -1;
 124 static int hf_rx_ifmtu = -1;
 125 static int hf_rx_maxmtu = -1;
 126 static int hf_rx_rwind = -1;
 127 static int hf_rx_maxpackets = -1;
 128 static int hf_rx_abort = -1;
 129 static int hf_rx_abortcode = -1;
 130
 131 static gint ett_rx = -1;
 132 static gint ett_rx_flags = -1;
 133 static gint ett_rx_ack = -1;
 134 static gint ett_rx_challenge = -1;
 135 static gint ett_rx_response = -1;
 136 static gint ett_rx_encrypted = -1;
 137 static gint ett_rx_abort = -1;
 138
 139 static dissector_handle_t afs_handle;
 140
 141 static int
 142 dissect_rx_response_encrypted(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 143 {
 144         proto_tree *tree;
 145         proto_item *item;
 146         int old_offset=offset;
 147         int i;
 148         guint32 callnumber;
 149
 150         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, FALSE);
 151         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 152
 153         /* epoch : 4 bytes */
 154         {
 155                 nstime_t ts;
 156                 ts.secs = tvb_get_ntohl(tvb, offset);
 157                 ts.nsecs = 0;
 158
 159                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 160                         offset, 4, &ts);
 161                 offset += 4;
 162         }
 163
 164         /* cid : 4 bytes */
 165         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 166         offset += 4;
 167
 168         /*FIXME dont know how to handle this checksum, skipping it */
 169         offset += 4;
 170
 171         /* sequrityindex : 1 byte */
 172         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 173         offset += 4;
 174
 175         for (i=0; i<RX_MAXCALLS; i++) {
 176                 /* callnumber : 4 bytes */
 177                 callnumber = tvb_get_ntohl(tvb, offset);
 178                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 179                         offset, 4, callnumber);
 180                 offset += 4;
 181         }
 182
 183         /* inc nonce : 4 bytes */
 184         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 185         offset += 4;
 186
 187         /* level : 4 bytes */
 188         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 189         offset += 4;
 190
 191         proto_item_set_len(item, offset-old_offset);
 192         return offset;
 193 }
 194
 195
 196 static int
 197 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 198 {
 199         proto_tree *tree;
 200         proto_item *item;
 201         guint32 version, tl;
 202         int old_offset=offset;
 203
 204         if (check_col(pinfo->cinfo, COL_INFO)) {
 205                 col_add_fstr(pinfo->cinfo, COL_INFO,
 206                         "RESPONSE  "
 207                         "Seq: %lu  "
 208                         "Call: %lu  "
 209                         "Source Port: %s  "
 210                         "Destination Port: %s  ",
 211                         (unsigned long)seq,
 212                         (unsigned long)callnumber,
 213                         get_udp_port(pinfo->srcport),
 214                         get_udp_port(pinfo->destport)
 215                 );
 216         }
 217
 218         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, FALSE);
 219         tree = proto_item_add_subtree(item, ett_rx_response);
 220
 221         version = tvb_get_ntohl(tvb, offset);
 222         proto_tree_add_uint(tree, hf_rx_version, tvb,
 223                 offset, 4, version);
 224         offset += 4;
 225
 226         if (version==2) {
 227                 /* skip unused */
 228                 offset += 4;
 229
 230                 /* encrypted : struct */
 231                 offset = dissect_rx_response_encrypted(tvb, tree, offset);
 232
 233                 /* kvno */
 234                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 235                 offset += 4;
 236
 237                 /* ticket_len */
 238                 tl = tvb_get_ntohl(tvb, offset);
 239                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 240                         offset, 4, tl);
 241                 offset += 4;
 242
 243                 tvb_ensure_bytes_exist(tvb, offset, tl);
 244                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 245                 offset += tl;
 246         }
 247
 248         proto_item_set_len(item, offset-old_offset);
 249         return offset;
 250 }
 251
 252 static int
 253 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 254 {
 255         proto_tree *tree;
 256         proto_item *item;
 257         int old_offset=offset;
 258
 259         if (check_col(pinfo->cinfo, COL_INFO)) {
 260                 col_add_fstr(pinfo->cinfo, COL_INFO,
 261                         "ABORT  "
 262                         "Seq: %lu  "
 263                         "Call: %lu  "
 264                         "Source Port: %s  "
 265                         "Destination Port: %s  ",
 266                         (unsigned long)seq,
 267                         (unsigned long)callnumber,
 268                         get_udp_port(pinfo->srcport),
 269                         get_udp_port(pinfo->destport)
 270                 );
 271         }
 272
 273         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, FALSE);
 274         tree = proto_item_add_subtree(item, ett_rx_abort);
 275
 276         /* kvno */
 277         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, FALSE);
 278         offset += 4;
 279
 280         proto_item_set_len(item, offset-old_offset);
 281         return offset;
 282 }
 283
 284
 285 static int
 286 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 287 {
 288         proto_tree *tree;
 289         proto_item *item;
 290         guint32 version;
 291         int old_offset=offset;
 292
 293         if (check_col(pinfo->cinfo, COL_INFO)) {
 294                 col_add_fstr(pinfo->cinfo, COL_INFO,
 295                         "CHALLENGE  "
 296                         "Seq: %lu  "
 297                         "Call: %lu  "
 298                         "Source Port: %s  "
 299                         "Destination Port: %s  ",
 300                         (unsigned long)seq,
 301                         (unsigned long)callnumber,
 302                         get_udp_port(pinfo->srcport),
 303                         get_udp_port(pinfo->destport)
 304                 );
 305         }
 306
 307         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, FALSE);
 308         tree = proto_item_add_subtree(item, ett_rx_challenge);
 309
 310         version = tvb_get_ntohl(tvb, offset);
 311         proto_tree_add_uint(tree, hf_rx_version, tvb,
 312                 offset, 4, version);
 313         offset += 4;
 314
 315         if (version==2) {
 316                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 317                 offset += 4;
 318
 319                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 320                 offset += 4;
 321         }
 322
 323         proto_item_set_len(item, offset-old_offset);
 324         return offset;
 325 }
 326
 327 static int
 328 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 329 {
 330         proto_tree *tree;
 331         proto_item *item;
 332         guint8 num;
 333         int old_offset = offset;
 334
 335         if (check_col(pinfo->cinfo, COL_INFO)) {
 336                 col_add_fstr(pinfo->cinfo, COL_INFO,
 337                         "ACK  "
 338                         "Seq: %lu  "
 339                         "Call: %lu  "
 340                         "Source Port: %s  "
 341                         "Destination Port: %s  ",
 342                         (unsigned long)seq,
 343                         (unsigned long)callnumber,
 344                         get_udp_port(pinfo->srcport),
 345                         get_udp_port(pinfo->destport)
 346                 );
 347         }
 348
 349         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, FALSE);
 350         tree = proto_item_add_subtree(item, ett_rx_ack);
 351
 352
 353         /* bufferspace: 2 bytes*/
 354         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 355         offset += 2;
 356
 357         /* maxskew: 2 bytes*/
 358         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 359         offset += 2;
 360
 361         /* first packet: 4 bytes*/
 362         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 363         offset += 4;
 364
 365         /* prev packet: 4 bytes*/
 366         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 367         offset += 4;
 368
 369         /* serial : 4 bytes */
 370         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 371         offset += 4;
 372
 373         /* reason : 1 byte */
 374         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 375         offset += 1;
 376
 377         /* nACKs */
 378         num = tvb_get_guint8(tvb, offset);
 379         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 380         offset += 1;
 381
 382         while(num--){
 383                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 384                         FALSE);
 385                 offset += 1;
 386         }
 387
 388         /* Some implementations adds some extra fields.
 389          * As far as I can see, these first add 3 padding bytes and then
 390          * up to 4 32-bit values. (0,3,4 have been witnessed)
 391          *
 392          * RX as a protocol seems to be completely nondefined and seems to lack
 393          * any sort of documentation other than "read the source of any of the
 394          * (compatible?) implementations.
 395          */
 396         if (tvb_length_remaining(tvb, offset)>3) {
 397                 offset += 3;    /* guess. some implementations adds 3 bytes */
 398
 399                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 400                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 401                                 FALSE);
 402                         offset += 4;
 403                 }
 404                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 405                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 406                                 FALSE);
 407                         offset += 4;
 408                 }
 409                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 410                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 411                                 FALSE);
 412                         offset += 4;
 413                 }
 414                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 415                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 416                                 FALSE);
 417                         offset += 4;
 418                 }
 419         }
 420
 421         proto_item_set_len(item, offset-old_offset);
 422         return offset;
 423 }
 424
 425
 426 static int
 427 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 428 {
 429         proto_tree *tree;
 430         proto_item *item;
 431         guint8 flags;
 432
 433         flags = tvb_get_guint8(tvb, offset);
 434         rxinfo->flags = flags;
 435
 436         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 437                 offset, 1, flags);
 438         tree = proto_item_add_subtree(item, ett_rx_flags);
 439
 440         proto_tree_add_boolean(tree, hf_rx_flags_free_packet, tvb,
 441                 offset, 1, flags);
 442         proto_tree_add_boolean(tree, hf_rx_flags_more_packets, tvb,
 443                 offset, 1, flags);
 444         proto_tree_add_boolean(tree, hf_rx_flags_last_packet, tvb,
 445                 offset, 1, flags);
 446         proto_tree_add_boolean(tree, hf_rx_flags_request_ack, tvb,
 447                 offset, 1, flags);
 448         proto_tree_add_boolean(tree, hf_rx_flags_clientinit, tvb,
 449                 offset, 1, flags);
 450
 451         offset += 1;
 452         return offset;
 453 }
 454
 455 static void
 456 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 457 {
 458         proto_tree *tree;
 459         proto_item *item;
 460         int offset = 0;
 461         struct rxinfo rxinfo;
 462         guint8 type;
 463         guint32 seq, callnumber;
 464         guint16 serviceid;
 465
 466         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 467                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 468         if (check_col(pinfo->cinfo, COL_INFO))
 469                 col_clear(pinfo->cinfo, COL_INFO);
 470
 471         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 472                 offset, 28, "RX Protocol");
 473         tree = proto_item_add_subtree(item, ett_rx);
 474
 475         /* epoch : 4 bytes */
 476         {
 477                 nstime_t ts;
 478                 ts.secs = tvb_get_ntohl(tvb, offset);
 479                 ts.nsecs = 0;
 480
 481                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 482                         offset, 4, &ts);
 483                 offset += 4;
 484         }
 485
 486         /* cid : 4 bytes */
 487         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 488         offset += 4;
 489
 490         /* callnumber : 4 bytes */
 491         callnumber = tvb_get_ntohl(tvb, offset);
 492         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 493                 offset, 4, callnumber);
 494         offset += 4;
 495         rxinfo.callnumber = callnumber;
 496
 497         /* seq : 4 bytes */
 498         seq = tvb_get_ntohl(tvb, offset);
 499         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 500                 offset, 4, seq);
 501         offset += 4;
 502         rxinfo.seq = seq;
 503
 504         /* serial : 4 bytes */
 505         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 506         offset += 4;
 507
 508         /* type : 1 byte */
 509         type = tvb_get_guint8(tvb, offset);
 510         proto_tree_add_uint(tree, hf_rx_type, tvb,
 511                 offset, 1, type);
 512         offset += 1;
 513         rxinfo.type = type;
 514
 515         /* flags : 1 byte */
 516         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 517
 518         /* userstatus : 1 byte */
 519         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 520         offset += 1;
 521
 522         /* sequrityindex : 1 byte */
 523         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 524         offset += 1;
 525
 526         /*
 527          * How clever: even though the AFS header files indicate that the
 528          * serviceId is first, it's really encoded _after_ the spare field.
 529          * I wasted a day figuring that out!
 530          */
 531
 532         /* spare */
 533         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 534         offset += 2;
 535
 536         /* service id : 2 bytes */
 537         serviceid = tvb_get_ntohs(tvb, offset);
 538         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 539                 offset, 2, serviceid);
 540         offset += 2;
 541         rxinfo.serviceid = serviceid;
 542
 543         switch (type) {
 544         case RX_PACKET_TYPE_ACK:
 545                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 546                         cant create it in a parallell tree, then ett seasrch
 547                         wont work */
 548                 dissect_rx_acks(tvb, pinfo, tree, offset,
 549                         seq, callnumber);
 550                 break;
 551         case RX_PACKET_TYPE_ACKALL:
 552                 /* does not contain any payload */
 553                 if (check_col(pinfo->cinfo, COL_INFO)) {
 554                         col_add_fstr(pinfo->cinfo, COL_INFO,
 555                                 "ACKALL  "
 556                                 "Seq: %lu  "
 557                                 "Call: %lu  "
 558                                 "Source Port: %s  "
 559                                 "Destination Port: %s  ",
 560                                 (unsigned long)seq,
 561                                 (unsigned long)callnumber,
 562                                 get_udp_port(pinfo->srcport),
 563                                 get_udp_port(pinfo->destport)
 564                         );
 565                 }
 566                 break;
 567         case RX_PACKET_TYPE_CHALLENGE:
 568                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 569                 break;
 570         case RX_PACKET_TYPE_RESPONSE:
 571                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 572                 break;
 573         case RX_PACKET_TYPE_DATA: {
 574                 tvbuff_t *next_tvb;
 575                 pinfo->private_data = &rxinfo;
 576                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 577                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 578                 };
 579                 break;
 580         case RX_PACKET_TYPE_ABORT:
 581                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 582                 break;
 583         }
 584
 585 }
 586
 587 void
 588 proto_register_rx(void)
 589 {
 590         static hf_register_info hf[] = {
 591                 { &hf_rx_epoch, {
 592                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_DEC,
 593                         NULL, 0, "Epoch", HFILL }},
 594
 595                 { &hf_rx_cid, {
 596                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 597                         NULL, 0, "CID", HFILL }},
 598
 599                 { &hf_rx_callnumber, {
 600                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 601                         NULL, 0, "Call Number", HFILL }},
 602
 603                 { &hf_rx_seq, {
 604                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 605                         NULL, 0, "Sequence Number", HFILL }},
 606
 607                 { &hf_rx_serial, {
 608                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 609                         NULL, 0, "Serial", HFILL }},
 610
 611                 { &hf_rx_type, {
 612                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 613                         VALS(rx_types), 0, "Type", HFILL }},
 614
 615                 { &hf_rx_flags, {
 616                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 617                         NULL, 0, "Flags", HFILL }},
 618
 619                 { &hf_rx_flags_clientinit, {
 620                         "Client Initiated", "rx.flags.client_init", FT_BOOLEAN, 8,
 621                         NULL, RX_CLIENT_INITIATED, "Client Initiated", HFILL }},
 622
 623                 { &hf_rx_flags_request_ack, {
 624                         "Request Ack", "rx.flags.request_ack", FT_BOOLEAN, 8,
 625                         NULL, RX_REQUEST_ACK, "Request Ack", HFILL }},
 626
 627                 { &hf_rx_flags_last_packet, {
 628                         "Last Packet", "rx.flags.last_packet", FT_BOOLEAN, 8,
 629                         NULL, RX_LAST_PACKET, "Last Packet", HFILL }},
 630
 631                 { &hf_rx_flags_more_packets, {
 632                         "More Packets", "rx.flags.more_packets", FT_BOOLEAN, 8,
 633                         NULL, RX_MORE_PACKETS, "More Packets", HFILL }},
 634
 635                 { &hf_rx_flags_free_packet, {
 636                         "Free Packet", "rx.flags.free_packet", FT_BOOLEAN, 8,
 637                         NULL, RX_FREE_PACKET, "Free Packet", HFILL }},
 638
 639                 /* XXX - what about RX_SLOW_START_OR_JUMBO? */
 640
 641                 { &hf_rx_userstatus, {
 642                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 643                         NULL, 0, "User Status", HFILL }},
 644
 645                 { &hf_rx_securityindex, {
 646                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 647                         NULL, 0, "Security Index", HFILL }},
 648
 649                 { &hf_rx_spare, {
 650                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 651                         NULL, 0, "Spare/Checksum", HFILL }},
 652
 653                 { &hf_rx_serviceid, {
 654                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 655                         NULL, 0, "Service ID", HFILL }},
 656
 657                 { &hf_rx_bufferspace, {
 658                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 659                         NULL, 0, "Number Of Packets Available", HFILL }},
 660
 661                 { &hf_rx_maxskew, {
 662                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 663                         NULL, 0, "Max Skew", HFILL }},
 664
 665                 { &hf_rx_first_packet, {
 666                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 667                         NULL, 0, "First Packet", HFILL }},
 668
 669                 { &hf_rx_prev_packet, {
 670                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 671                         NULL, 0, "Previous Packet", HFILL }},
 672
 673                 { &hf_rx_reason, {
 674                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 675                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 676
 677                 { &hf_rx_numacks, {
 678                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 679                         NULL, 0, "Number Of ACKs", HFILL }},
 680
 681                 { &hf_rx_ack_type, {
 682                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 683                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 684
 685                 { &hf_rx_ack, {
 686                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 687                         NULL, 0, "ACK Packet", HFILL }},
 688
 689                 { &hf_rx_challenge, {
 690                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 691                         NULL, 0, "CHALLENGE Packet", HFILL }},
 692
 693                 { &hf_rx_version, {
 694                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 695                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 696
 697                 { &hf_rx_nonce, {
 698                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 699                         NULL, 0, "Nonce", HFILL }},
 700
 701                 { &hf_rx_inc_nonce, {
 702                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 703                         NULL, 0, "Incremented Nonce", HFILL }},
 704
 705                 { &hf_rx_min_level, {
 706                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 707                         NULL, 0, "Min Level", HFILL }},
 708
 709                 { &hf_rx_level, {
 710                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 711                         NULL, 0, "Level", HFILL }},
 712
 713                 { &hf_rx_response, {
 714                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 715                         NULL, 0, "RESPONSE Packet", HFILL }},
 716
 717                 { &hf_rx_abort, {
 718                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 719                         NULL, 0, "ABORT Packet", HFILL }},
 720
 721                 { &hf_rx_encrypted, {
 722                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 723                         NULL, 0, "Encrypted part of response packet", HFILL }},
 724
 725                 { &hf_rx_kvno, {
 726                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 727                         NULL, 0, "kvno", HFILL }},
 728
 729                 { &hf_rx_ticket_len, {
 730                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 731                         NULL, 0, "Ticket Length", HFILL }},
 732
 733                 { &hf_rx_ticket, {
 734                         "ticket", "rx.ticket", FT_BYTES, BASE_HEX,
 735                         NULL, 0, "Ticket", HFILL }},
 736
 737                 { &hf_rx_ifmtu, {
 738                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 739                         NULL, 0, "Interface MTU", HFILL }},
 740
 741                 { &hf_rx_maxmtu, {
 742                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 743                         NULL, 0, "Max MTU", HFILL }},
 744
 745                 { &hf_rx_rwind, {
 746                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 747                         NULL, 0, "rwind", HFILL }},
 748
 749                 { &hf_rx_maxpackets, {
 750                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 751                         NULL, 0, "Max Packets", HFILL }},
 752
 753                 { &hf_rx_abortcode, {
 754                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 755                         NULL, 0, "Abort Code", HFILL }},
 756
 757         };
 758         static gint *ett[] = {
 759                 &ett_rx,
 760                 &ett_rx_flags,
 761                 &ett_rx_ack,
 762                 &ett_rx_challenge,
 763                 &ett_rx_response,
 764                 &ett_rx_encrypted,
 765                 &ett_rx_abort
 766         };
 767
 768         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 769         proto_register_field_array(proto_rx, hf, array_length(hf));
 770         proto_register_subtree_array(ett, array_length(ett));
 771 }
 772
 773 void
 774 proto_reg_handoff_rx(void)
 775 {
 776         dissector_handle_t rx_handle;
 777
 778         int port;
 779
 780         /*
 781          * Get handle for the AFS dissector.
 782          */
 783         afs_handle = find_dissector("afs");
 784
 785         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 786            are all used for various AFS services. */
 787         rx_handle = create_dissector_handle(dissect_rx, proto_rx);
 788         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 789                 dissector_add("udp.port", port, rx_handle);
 790         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 791 }