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: packet-rx.c,v 1.32 2002/02/01 16:37:18 nneul Exp $
   8  *
   9  * Ethereal - Network traffic analyzer
  10  * By Gerald Combs <gerald@ethereal.com>
  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 #ifdef HAVE_SYS_TYPES_H
  37 # include <sys/types.h>
  38 #endif
  39
  40 #ifdef HAVE_NETINET_IN_H
  41 # include <netinet/in.h>
  42 #endif
  43
  44 #include <string.h>
  45 #include <glib.h>
  46 #include <epan/packet.h>
  47 #include "packet-rx.h"
  48 #include <epan/resolv.h>
  49
  50 #define UDP_PORT_RX_LOW         7000
  51 #define UDP_PORT_RX_HIGH        7009
  52 #define UDP_PORT_RX_AFS_BACKUPS 7021
  53
  54 static const value_string rx_types[] = {
  55         { RX_PACKET_TYPE_DATA,          "data" },
  56         { RX_PACKET_TYPE_ACK,           "ack" },
  57         { RX_PACKET_TYPE_BUSY,          "busy" },
  58         { RX_PACKET_TYPE_ABORT,         "abort" },
  59         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  60         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  61         { RX_PACKET_TYPE_RESPONSE,      "response" },
  62         { RX_PACKET_TYPE_DEBUG,         "debug" },
  63         { RX_PACKET_TYPE_PARAMS,        "params" },
  64         { RX_PACKET_TYPE_VERSION,       "version" },
  65         { 0,                            NULL },
  66 };
  67
  68 static const value_string rx_flags[] = {
  69         { RX_CLIENT_INITIATED,  "client-init" },
  70         { RX_REQUEST_ACK,       "req-ack" },
  71         { RX_LAST_PACKET,       "last-pckt" },
  72         { RX_MORE_PACKETS,      "more-pckts" },
  73         { RX_FREE_PACKET,       "free-pckt" },
  74         { 0,                    NULL }
  75 };
  76
  77 static const value_string rx_reason[] = {
  78         { RX_ACK_REQUESTED,             "Ack Requested"         },
  79         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  80         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  81         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  82         { RX_ACK_NOSPACE,               "No Space"              },
  83         { RX_ACK_PING,                  "Ping"                  },
  84         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  85         { RX_ACK_DELAY,                 "Delay"                 },
  86         { 0,                            NULL                    }
  87 };
  88
  89 static const value_string rx_ack_type[] = {
  90         { RX_ACK_TYPE_NACK,     "NACK"  },
  91         { RX_ACK_TYPE_ACK,      "ACK"   },
  92         { 0,                    NULL    }
  93 };
  94
  95 static int proto_rx = -1;
  96 static int hf_rx_epoch = -1;
  97 static int hf_rx_cid = -1;
  98 static int hf_rx_seq = -1;
  99 static int hf_rx_serial = -1;
 100 static int hf_rx_callnumber = -1;
 101 static int hf_rx_type = -1;
 102 static int hf_rx_flags = -1;
 103 static int hf_rx_flags_clientinit = -1;
 104 static int hf_rx_flags_request_ack = -1;
 105 static int hf_rx_flags_last_packet = -1;
 106 static int hf_rx_flags_more_packets = -1;
 107 static int hf_rx_flags_free_packet = -1;
 108 static int hf_rx_userstatus = -1;
 109 static int hf_rx_securityindex = -1;
 110 static int hf_rx_spare = -1;
 111 static int hf_rx_serviceid = -1;
 112 static int hf_rx_bufferspace = -1;
 113 static int hf_rx_maxskew = -1;
 114 static int hf_rx_first_packet = -1;
 115 static int hf_rx_prev_packet = -1;
 116 static int hf_rx_reason = -1;
 117 static int hf_rx_numacks = -1;
 118 static int hf_rx_ack_type = -1;
 119 static int hf_rx_ack = -1;
 120 static int hf_rx_challenge = -1;
 121 static int hf_rx_version = -1;
 122 static int hf_rx_nonce = -1;
 123 static int hf_rx_inc_nonce = -1;
 124 static int hf_rx_min_level = -1;
 125 static int hf_rx_level = -1;
 126 static int hf_rx_response = -1;
 127 static int hf_rx_encrypted = -1;
 128 static int hf_rx_kvno = -1;
 129 static int hf_rx_ticket_len = -1;
 130 static int hf_rx_ticket = -1;
 131 static int hf_rx_ifmtu = -1;
 132 static int hf_rx_maxmtu = -1;
 133 static int hf_rx_rwind = -1;
 134 static int hf_rx_maxpackets = -1;
 135 static int hf_rx_abort = -1;
 136 static int hf_rx_abortcode = -1;
 137
 138 static gint ett_rx = -1;
 139 static gint ett_rx_flags = -1;
 140 static gint ett_rx_ack = -1;
 141 static gint ett_rx_challenge = -1;
 142 static gint ett_rx_response = -1;
 143 static gint ett_rx_encrypted = -1;
 144 static gint ett_rx_abort = -1;
 145
 146 static dissector_handle_t afs_handle;
 147
 148 static int
 149 dissect_rx_response_encrypted(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
 150 {
 151         proto_tree *tree;
 152         proto_item *item;
 153         int old_offset=offset;
 154         int i;
 155         guint32 callnumber;
 156
 157         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, FALSE);
 158         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 159
 160         /* epoch : 4 bytes */
 161         {
 162                 nstime_t ts;
 163                 ts.secs = tvb_get_ntohl(tvb, offset);
 164                 ts.nsecs = 0;
 165
 166                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 167                         offset, 4, &ts);
 168                 offset += 4;
 169         }
 170
 171         /* cid : 4 bytes */
 172         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 173         offset += 4;
 174
 175         /*FIXME dont know how to handle this checksum, skipping it */
 176         offset += 4;
 177
 178         /* sequrityindex : 1 byte */
 179         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 180         offset += 4;
 181
 182         for (i=0; i<RX_MAXCALLS; i++) {
 183                 /* callnumber : 4 bytes */
 184                 callnumber = tvb_get_ntohl(tvb, offset);
 185                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 186                         offset, 4, callnumber);
 187                 offset += 4;
 188         }
 189
 190         /* inc nonce : 4 bytes */
 191         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 192         offset += 4;
 193
 194         /* level : 4 bytes */
 195         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 196         offset += 4;
 197
 198         proto_item_set_len(item, offset-old_offset);
 199         return offset;
 200 }
 201
 202
 203 static int
 204 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 205 {
 206         proto_tree *tree;
 207         proto_item *item;
 208         guint32 version, tl;
 209         int old_offset=offset;
 210
 211         if (check_col(pinfo->cinfo, COL_INFO)) {
 212                 col_add_fstr(pinfo->cinfo, COL_INFO,
 213                         "RESPONSE  "
 214                         "Seq: %lu  "
 215                         "Call: %lu  "
 216                         "Source Port: %s  "
 217                         "Destination Port: %s  ",
 218                         (unsigned long)seq,
 219                         (unsigned long)callnumber,
 220                         get_udp_port(pinfo->srcport),
 221                         get_udp_port(pinfo->destport)
 222                 );
 223         }
 224
 225         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, FALSE);
 226         tree = proto_item_add_subtree(item, ett_rx_response);
 227
 228         version = tvb_get_ntohl(tvb, offset);
 229         proto_tree_add_uint(tree, hf_rx_version, tvb,
 230                 offset, 4, version);
 231         offset += 4;
 232
 233         if (version==2) {
 234                 /* skip unused */
 235                 offset += 4;
 236
 237                 /* encrypted : struct */
 238                 offset = dissect_rx_response_encrypted(tvb, pinfo, tree, offset);
 239
 240                 /* kvno */
 241                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 242                 offset += 4;
 243
 244                 /* ticket_len */
 245                 tl = tvb_get_ntohl(tvb, offset);
 246                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 247                         offset, 4, tl);
 248                 offset += 4;
 249
 250                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 251                 offset += tl;
 252         }
 253
 254         proto_item_set_len(item, offset-old_offset);
 255         return offset;
 256 }
 257
 258 static int
 259 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 260 {
 261         proto_tree *tree;
 262         proto_item *item;
 263         int old_offset=offset;
 264
 265         if (check_col(pinfo->cinfo, COL_INFO)) {
 266                 col_add_fstr(pinfo->cinfo, COL_INFO,
 267                         "ABORT  "
 268                         "Seq: %lu  "
 269                         "Call: %lu  "
 270                         "Source Port: %s  "
 271                         "Destination Port: %s  ",
 272                         (unsigned long)seq,
 273                         (unsigned long)callnumber,
 274                         get_udp_port(pinfo->srcport),
 275                         get_udp_port(pinfo->destport)
 276                 );
 277         }
 278
 279         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, FALSE);
 280         tree = proto_item_add_subtree(item, ett_rx_abort);
 281
 282         /* kvno */
 283         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, FALSE);
 284         offset += 4;
 285
 286         proto_item_set_len(item, offset-old_offset);
 287         return offset;
 288 }
 289
 290
 291 static int
 292 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 293 {
 294         proto_tree *tree;
 295         proto_item *item;
 296         guint32 version;
 297         int old_offset=offset;
 298
 299         if (check_col(pinfo->cinfo, COL_INFO)) {
 300                 col_add_fstr(pinfo->cinfo, COL_INFO,
 301                         "CHALLENGE  "
 302                         "Seq: %lu  "
 303                         "Call: %lu  "
 304                         "Source Port: %s  "
 305                         "Destination Port: %s  ",
 306                         (unsigned long)seq,
 307                         (unsigned long)callnumber,
 308                         get_udp_port(pinfo->srcport),
 309                         get_udp_port(pinfo->destport)
 310                 );
 311         }
 312
 313         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, FALSE);
 314         tree = proto_item_add_subtree(item, ett_rx_challenge);
 315
 316         version = tvb_get_ntohl(tvb, offset);
 317         proto_tree_add_uint(tree, hf_rx_version, tvb,
 318                 offset, 4, version);
 319         offset += 4;
 320
 321         if (version==2) {
 322                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 323                 offset += 4;
 324
 325                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 326                 offset += 4;
 327         }
 328
 329         proto_item_set_len(item, offset-old_offset);
 330         return offset;
 331 }
 332
 333 static int
 334 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 335 {
 336         proto_tree *tree;
 337         proto_item *item;
 338         guint8 num;
 339         int old_offset = offset;
 340
 341         if (check_col(pinfo->cinfo, COL_INFO)) {
 342                 col_add_fstr(pinfo->cinfo, COL_INFO,
 343                         "ACK  "
 344                         "Seq: %lu  "
 345                         "Call: %lu  "
 346                         "Source Port: %s  "
 347                         "Destination Port: %s  ",
 348                         (unsigned long)seq,
 349                         (unsigned long)callnumber,
 350                         get_udp_port(pinfo->srcport),
 351                         get_udp_port(pinfo->destport)
 352                 );
 353         }
 354
 355         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, FALSE);
 356         tree = proto_item_add_subtree(item, ett_rx_ack);
 357
 358
 359         /* bufferspace: 2 bytes*/
 360         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 361         offset += 2;
 362
 363         /* maxskew: 2 bytes*/
 364         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 365         offset += 2;
 366
 367         /* first packet: 4 bytes*/
 368         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 369         offset += 4;
 370
 371         /* prev packet: 4 bytes*/
 372         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 373         offset += 4;
 374
 375         /* serial : 4 bytes */
 376         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 377         offset += 4;
 378
 379         /* reason : 1 byte */
 380         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 381         offset += 1;
 382
 383         /* nACKs */
 384         num = tvb_get_guint8(tvb, offset);
 385         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 386         offset += 1;
 387
 388         while(num--){
 389                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 390                         FALSE);
 391                 offset += 1;
 392         }
 393
 394         /* Some implementations adds some extra fields.
 395          * As far as I can see, these first add 3 padding bytes and then
 396          * up to 4 32-bit values. (0,3,4 have been witnessed)
 397          *
 398          * RX as a protocol seems to be completely nondefined and seems to lack
 399          * any sort of documentation other than "read the source of any of the
 400          * (compatible?) implementations.
 401          */
 402         if (tvb_length_remaining(tvb, offset)>3) {
 403                 offset += 3;    /* guess. some implementations adds 3 bytes */
 404
 405                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 406                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 407                                 FALSE);
 408                         offset += 4;
 409                 }
 410                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 411                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 412                                 FALSE);
 413                         offset += 4;
 414                 }
 415                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 416                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 417                                 FALSE);
 418                         offset += 4;
 419                 }
 420                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 421                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 422                                 FALSE);
 423                         offset += 4;
 424                 }
 425         }
 426
 427         proto_item_set_len(item, offset-old_offset);
 428         return offset;
 429 }
 430
 431
 432 static int
 433 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 434 {
 435         proto_tree *tree;
 436         proto_item *item;
 437         guint8 flags;
 438
 439         flags = tvb_get_guint8(tvb, offset);
 440         rxinfo->flags = flags;
 441
 442         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 443                 offset, 1, flags);
 444         tree = proto_item_add_subtree(item, ett_rx_flags);
 445
 446         proto_tree_add_uint(tree, hf_rx_flags_free_packet, tvb,
 447                 offset, 1, flags);
 448         proto_tree_add_uint(tree, hf_rx_flags_more_packets, tvb,
 449                 offset, 1, flags);
 450         proto_tree_add_uint(tree, hf_rx_flags_last_packet, tvb,
 451                 offset, 1, flags);
 452         proto_tree_add_uint(tree, hf_rx_flags_request_ack, tvb,
 453                 offset, 1, flags);
 454         proto_tree_add_uint(tree, hf_rx_flags_clientinit, tvb,
 455                 offset, 1, flags);
 456
 457         offset += 1;
 458         return offset;
 459 }
 460
 461 static void
 462 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 463 {
 464         proto_tree *tree;
 465         proto_item *item;
 466         int offset = 0;
 467         struct rxinfo rxinfo;
 468         guint8 type;
 469         guint32 seq, callnumber;
 470         guint16 serviceid;
 471
 472         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 473                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 474         if (check_col(pinfo->cinfo, COL_INFO))
 475                 col_clear(pinfo->cinfo, COL_INFO);
 476
 477         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 478                 offset, 28, "RX Protocol");
 479         tree = proto_item_add_subtree(item, ett_rx);
 480
 481         /* epoch : 4 bytes */
 482         {
 483                 nstime_t ts;;
 484                 ts.secs = tvb_get_ntohl(tvb, offset);
 485                 ts.nsecs = 0;
 486
 487                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 488                         offset, 4, &ts);
 489                 offset += 4;
 490         }
 491
 492         /* cid : 4 bytes */
 493         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 494         offset += 4;
 495
 496         /* callnumber : 4 bytes */
 497         callnumber = tvb_get_ntohl(tvb, offset);
 498         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 499                 offset, 4, callnumber);
 500         offset += 4;
 501         rxinfo.callnumber = callnumber;
 502
 503         /* seq : 4 bytes */
 504         seq = tvb_get_ntohl(tvb, offset);
 505         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 506                 offset, 4, seq);
 507         offset += 4;
 508         rxinfo.seq = seq;
 509
 510         /* serial : 4 bytes */
 511         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 512         offset += 4;
 513
 514         /* type : 1 byte */
 515         type = tvb_get_guint8(tvb, offset);
 516         proto_tree_add_uint(tree, hf_rx_type, tvb,
 517                 offset, 1, type);
 518         offset += 1;
 519         rxinfo.type = type;
 520
 521         /* flags : 1 byte */
 522         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 523
 524         /* userstatus : 1 byte */
 525         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 526         offset += 1;
 527
 528         /* sequrityindex : 1 byte */
 529         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 530         offset += 1;
 531
 532         /*
 533          * How clever: even though the AFS header files indicate that the
 534          * serviceId is first, it's really encoded _after_ the spare field.
 535          * I wasted a day figuring that out!
 536          */
 537
 538         /* spare */
 539         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 540         offset += 2;
 541
 542         /* service id : 2 bytes */
 543         serviceid = tvb_get_ntohs(tvb, offset);
 544         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 545                 offset, 2, serviceid);
 546         offset += 2;
 547         rxinfo.serviceid = serviceid;
 548
 549         switch (type) {
 550         case RX_PACKET_TYPE_ACK:
 551                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 552                         cant create it in a parallell tree, then ett seasrch
 553                         wont work */
 554                 dissect_rx_acks(tvb, pinfo, tree, offset,
 555                         seq, callnumber);
 556                 break;
 557         case RX_PACKET_TYPE_ACKALL:
 558                 /* does not contain any payload */
 559                 if (check_col(pinfo->cinfo, COL_INFO)) {
 560                         col_add_fstr(pinfo->cinfo, COL_INFO,
 561                                 "ACKALL  "
 562                                 "Seq: %lu  "
 563                                 "Call: %lu  "
 564                                 "Source Port: %s  "
 565                                 "Destination Port: %s  ",
 566                                 (unsigned long)seq,
 567                                 (unsigned long)callnumber,
 568                                 get_udp_port(pinfo->srcport),
 569                                 get_udp_port(pinfo->destport)
 570                         );
 571                 }
 572                 break;
 573         case RX_PACKET_TYPE_CHALLENGE:
 574                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 575                 break;
 576         case RX_PACKET_TYPE_RESPONSE:
 577                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 578                 break;
 579         case RX_PACKET_TYPE_DATA: {
 580                 tvbuff_t *next_tvb;
 581                 pinfo->private_data = &rxinfo;
 582                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 583                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 584                 };
 585                 break;
 586         case RX_PACKET_TYPE_ABORT:
 587                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 588                 break;
 589         }
 590
 591 }
 592
 593 void
 594 proto_register_rx(void)
 595 {
 596         static hf_register_info hf[] = {
 597                 { &hf_rx_epoch, {
 598                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_DEC,
 599                         NULL, 0, "Epoch", HFILL }},
 600
 601                 { &hf_rx_cid, {
 602                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 603                         NULL, 0, "CID", HFILL }},
 604
 605                 { &hf_rx_callnumber, {
 606                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 607                         NULL, 0, "Call Number", HFILL }},
 608
 609                 { &hf_rx_seq, {
 610                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 611                         NULL, 0, "Sequence Number", HFILL }},
 612
 613                 { &hf_rx_serial, {
 614                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 615                         NULL, 0, "Serial", HFILL }},
 616
 617                 { &hf_rx_type, {
 618                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 619                         VALS(rx_types), 0, "Type", HFILL }},
 620
 621                 { &hf_rx_flags, {
 622                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 623                         NULL, 0, "Flags", HFILL }},
 624
 625                 { &hf_rx_flags_clientinit, {
 626                         "Client Initiated", "rx.flags.client_init", FT_UINT8, BASE_BIN,
 627                         NULL, RX_CLIENT_INITIATED, "Client Initiated", HFILL }},
 628
 629                 { &hf_rx_flags_request_ack, {
 630                         "Request Ack", "rx.flags.request_ack", FT_UINT8, BASE_BIN,
 631                         NULL, RX_REQUEST_ACK, "Request Ack", HFILL }},
 632
 633                 { &hf_rx_flags_last_packet, {
 634                         "Last Packet", "rx.flags.last_packet", FT_UINT8, BASE_BIN,
 635                         NULL, RX_LAST_PACKET, "Last Packet", HFILL }},
 636
 637                 { &hf_rx_flags_more_packets, {
 638                         "More Packets", "rx.flags.more_packets", FT_UINT8, BASE_BIN,
 639                         NULL, RX_MORE_PACKETS, "More Packets", HFILL }},
 640
 641                 { &hf_rx_flags_free_packet, {
 642                         "Free Packet", "rx.flags.free_packet", FT_UINT8, BASE_BIN,
 643                         NULL, RX_FREE_PACKET, "Free Packet", HFILL }},
 644
 645                 { &hf_rx_userstatus, {
 646                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 647                         NULL, 0, "User Status", HFILL }},
 648
 649                 { &hf_rx_securityindex, {
 650                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 651                         NULL, 0, "Security Index", HFILL }},
 652
 653                 { &hf_rx_spare, {
 654                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 655                         NULL, 0, "Spare/Checksum", HFILL }},
 656
 657                 { &hf_rx_serviceid, {
 658                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 659                         NULL, 0, "Service ID", HFILL }},
 660
 661                 { &hf_rx_bufferspace, {
 662                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 663                         NULL, 0, "Number Of Packets Available", HFILL }},
 664
 665                 { &hf_rx_maxskew, {
 666                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 667                         NULL, 0, "Max Skew", HFILL }},
 668
 669                 { &hf_rx_first_packet, {
 670                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 671                         NULL, 0, "First Packet", HFILL }},
 672
 673                 { &hf_rx_prev_packet, {
 674                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 675                         NULL, 0, "Previous Packet", HFILL }},
 676
 677                 { &hf_rx_reason, {
 678                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 679                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 680
 681                 { &hf_rx_numacks, {
 682                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 683                         NULL, 0, "Number Of ACKs", HFILL }},
 684
 685                 { &hf_rx_ack_type, {
 686                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 687                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 688
 689                 { &hf_rx_ack, {
 690                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 691                         NULL, 0, "ACK Packet", HFILL }},
 692
 693                 { &hf_rx_challenge, {
 694                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 695                         NULL, 0, "CHALLENGE Packet", HFILL }},
 696
 697                 { &hf_rx_version, {
 698                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 699                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 700
 701                 { &hf_rx_nonce, {
 702                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 703                         NULL, 0, "Nonce", HFILL }},
 704
 705                 { &hf_rx_inc_nonce, {
 706                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 707                         NULL, 0, "Incremented Nonce", HFILL }},
 708
 709                 { &hf_rx_min_level, {
 710                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 711                         NULL, 0, "Min Level", HFILL }},
 712
 713                 { &hf_rx_level, {
 714                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 715                         NULL, 0, "Level", HFILL }},
 716
 717                 { &hf_rx_response, {
 718                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 719                         NULL, 0, "RESPONSE Packet", HFILL }},
 720
 721                 { &hf_rx_abort, {
 722                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 723                         NULL, 0, "ABORT Packet", HFILL }},
 724
 725                 { &hf_rx_encrypted, {
 726                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 727                         NULL, 0, "Encrypted part of response packet", HFILL }},
 728
 729                 { &hf_rx_kvno, {
 730                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 731                         NULL, 0, "kvno", HFILL }},
 732
 733                 { &hf_rx_ticket_len, {
 734                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 735                         NULL, 0, "Ticket Length", HFILL }},
 736
 737                 { &hf_rx_ticket, {
 738                         "ticket", "rx.ticket", FT_BYTES, BASE_HEX,
 739                         NULL, 0, "Ticket", HFILL }},
 740
 741                 { &hf_rx_ifmtu, {
 742                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 743                         NULL, 0, "Interface MTU", HFILL }},
 744
 745                 { &hf_rx_maxmtu, {
 746                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 747                         NULL, 0, "Max MTU", HFILL }},
 748
 749                 { &hf_rx_rwind, {
 750                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 751                         NULL, 0, "rwind", HFILL }},
 752
 753                 { &hf_rx_maxpackets, {
 754                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 755                         NULL, 0, "Max Packets", HFILL }},
 756
 757                 { &hf_rx_abortcode, {
 758                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 759                         NULL, 0, "Abort Code", HFILL }},
 760
 761         };
 762         static gint *ett[] = {
 763                 &ett_rx,
 764                 &ett_rx_flags,
 765                 &ett_rx_ack,
 766                 &ett_rx_challenge,
 767                 &ett_rx_response,
 768                 &ett_rx_encrypted,
 769                 &ett_rx_abort
 770         };
 771
 772         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 773         proto_register_field_array(proto_rx, hf, array_length(hf));
 774         proto_register_subtree_array(ett, array_length(ett));
 775 }
 776
 777 void
 778 proto_reg_handoff_rx(void)
 779 {
 780         dissector_handle_t rx_handle;
 781
 782         int port;
 783
 784         /*
 785          * Get handle for the AFS dissector.
 786          */
 787         afs_handle = find_dissector("afs");
 788
 789         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 790            are all used for various AFS services. */
 791         rx_handle = create_dissector_handle(dissect_rx, proto_rx);
 792         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 793                 dissector_add("udp.port", port, rx_handle);
 794         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 795 }