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 1.24 2001/08/04 04:04:34 guy 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 "packet.h"
  47 #include "packet-rx.h"
  48 #include "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
 136 static gint ett_rx = -1;
 137 static gint ett_rx_flags = -1;
 138 static gint ett_rx_ack = -1;
 139 static gint ett_rx_challenge = -1;
 140 static gint ett_rx_response = -1;
 141 static gint ett_rx_encrypted = -1;
 142
 143 static dissector_handle_t afs_handle;
 144
 145 static int
 146 dissect_rx_response_encrypted(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
 147 {
 148         proto_tree *tree;
 149         proto_item *item;
 150         int old_offset=offset;
 151         int i;
 152         guint32 callnumber;
 153
 154         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, 0, FALSE);
 155         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 156
 157         /* epoch : 4 bytes */
 158         {
 159                 struct timeval tv;
 160                 tv.tv_sec = tvb_get_ntohl(tvb, offset);
 161                 tv.tv_usec = 0;
 162
 163                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 164                         offset, 4, &tv);
 165                 offset += 4;
 166         }
 167
 168         /* cid : 4 bytes */
 169         proto_tree_add_uint(tree, hf_rx_cid, tvb,
 170                 offset, 4, tvb_get_ntohl(tvb, offset));
 171         offset += 4;
 172
 173         /*FIXME dont know how to handle this checksum, skipping it */
 174         offset += 4;
 175
 176         /* sequrityindex : 1 byte */
 177         proto_tree_add_uint(tree, hf_rx_securityindex, tvb,
 178                 offset, 1, tvb_get_guint8(tvb, offset));
 179         offset += 4;
 180
 181         for (i=0; i<RX_MAXCALLS; i++) {
 182                 /* callnumber : 4 bytes */
 183                 callnumber = tvb_get_ntohl(tvb, offset);
 184                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 185                         offset, 4, callnumber);
 186                 offset += 4;
 187         }
 188
 189         /* inc nonce : 4 bytes */
 190         proto_tree_add_uint(tree, hf_rx_inc_nonce, tvb,
 191                 offset, 4, tvb_get_ntohl(tvb, offset));
 192         offset += 4;
 193
 194         /* level : 4 bytes */
 195         proto_tree_add_uint(tree, hf_rx_level, tvb,
 196                 offset, 4, tvb_get_ntohl(tvb, offset));
 197         offset += 4;
 198
 199         proto_item_set_len(item, offset-old_offset);
 200         return offset;
 201 }
 202
 203
 204 static int
 205 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 206 {
 207         proto_tree *tree;
 208         proto_item *item;
 209         guint32 version, tl;
 210         int old_offset=offset;
 211
 212         if (check_col(pinfo->fd, COL_INFO)) {
 213                 col_add_fstr(pinfo->fd, COL_INFO,
 214                         "RESPONSE  "
 215                         "Seq: %lu  "
 216                         "Call: %lu  "
 217                         "Source Port: %s  "
 218                         "Destination Port: %s  ",
 219                         (unsigned long)seq,
 220                         (unsigned long)callnumber,
 221                         get_udp_port(pinfo->srcport),
 222                         get_udp_port(pinfo->destport)
 223                 );
 224         }
 225
 226         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, 0, FALSE);
 227         tree = proto_item_add_subtree(item, ett_rx_response);
 228
 229         version = tvb_get_ntohl(tvb, offset);
 230         proto_tree_add_uint(tree, hf_rx_version, tvb,
 231                 offset, 4, version);
 232         offset += 4;
 233
 234         if (version==2) {
 235                 /* skip unused */
 236                 offset += 4;
 237
 238                 /* encrypted : struct */
 239                 offset = dissect_rx_response_encrypted(tvb, pinfo, tree, offset);
 240
 241                 /* kvno */
 242                 proto_tree_add_uint(tree, hf_rx_kvno, tvb,
 243                         offset, 4, tvb_get_ntohl(tvb, offset));
 244                 offset += 4;
 245
 246                 /* ticket_len */
 247                 tl = tvb_get_ntohl(tvb, offset);
 248                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 249                         offset, 4, tl);
 250                 offset += 4;
 251
 252                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 253                 offset += tl;
 254         }
 255
 256         proto_item_set_len(item, offset-old_offset);
 257         return offset;
 258 }
 259
 260 static int
 261 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 262 {
 263         proto_tree *tree;
 264         proto_item *item;
 265         guint32 version;
 266         int old_offset=offset;
 267
 268         if (check_col(pinfo->fd, COL_INFO)) {
 269                 col_add_fstr(pinfo->fd, COL_INFO,
 270                         "CHALLENGE  "
 271                         "Seq: %lu  "
 272                         "Call: %lu  "
 273                         "Source Port: %s  "
 274                         "Destination Port: %s  ",
 275                         (unsigned long)seq,
 276                         (unsigned long)callnumber,
 277                         get_udp_port(pinfo->srcport),
 278                         get_udp_port(pinfo->destport)
 279                 );
 280         }
 281
 282         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, 0, FALSE);
 283         tree = proto_item_add_subtree(item, ett_rx_challenge);
 284
 285         version = tvb_get_ntohl(tvb, offset);
 286         proto_tree_add_uint(tree, hf_rx_version, tvb,
 287                 offset, 4, version);
 288         offset += 4;
 289
 290         if (version==2) {
 291                 proto_tree_add_uint(tree, hf_rx_nonce, tvb,
 292                         offset, 4, tvb_get_ntohl(tvb, offset));
 293                 offset += 4;
 294
 295                 proto_tree_add_uint(tree, hf_rx_min_level, tvb,
 296                         offset, 4, tvb_get_ntohl(tvb, offset));
 297                 offset += 4;
 298         }
 299
 300         proto_item_set_len(item, offset-old_offset);
 301         return offset;
 302 }
 303
 304 static int
 305 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 306 {
 307         proto_tree *tree;
 308         proto_item *item;
 309         guint8 num;
 310         int old_offset = offset;
 311
 312         if (check_col(pinfo->fd, COL_INFO)) {
 313                 col_add_fstr(pinfo->fd, COL_INFO,
 314                         "ACK  "
 315                         "Seq: %lu  "
 316                         "Call: %lu  "
 317                         "Source Port: %s  "
 318                         "Destination Port: %s  ",
 319                         (unsigned long)seq,
 320                         (unsigned long)callnumber,
 321                         get_udp_port(pinfo->srcport),
 322                         get_udp_port(pinfo->destport)
 323                 );
 324         }
 325
 326         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, 0, FALSE);
 327         tree = proto_item_add_subtree(item, ett_rx_ack);
 328
 329
 330         /* bufferspace: 2 bytes*/
 331         proto_tree_add_uint(tree, hf_rx_bufferspace, tvb,
 332                 offset, 2, tvb_get_ntohs(tvb, offset));
 333         offset += 2;
 334
 335         /* maxskew: 2 bytes*/
 336         proto_tree_add_uint(tree, hf_rx_maxskew, tvb,
 337                 offset, 2, tvb_get_ntohs(tvb, offset));
 338         offset += 2;
 339
 340         /* first packet: 4 bytes*/
 341         proto_tree_add_uint(tree, hf_rx_first_packet, tvb,
 342                 offset, 4, tvb_get_ntohl(tvb, offset));
 343         offset += 4;
 344
 345         /* prev packet: 4 bytes*/
 346         proto_tree_add_uint(tree, hf_rx_prev_packet, tvb,
 347                 offset, 4, tvb_get_ntohl(tvb, offset));
 348         offset += 4;
 349
 350         /* serial : 4 bytes */
 351         proto_tree_add_uint(tree, hf_rx_serial, tvb,
 352                 offset, 4, tvb_get_ntohl(tvb, offset) );
 353         offset += 4;
 354
 355         /* reason : 1 byte */
 356         proto_tree_add_uint(tree, hf_rx_reason, tvb,
 357                 offset, 1, tvb_get_guint8(tvb, offset) );
 358         offset += 1;
 359
 360         /* nACKs */
 361         num = tvb_get_guint8(tvb, offset);
 362         proto_tree_add_uint(tree, hf_rx_numacks, tvb,
 363                 offset, 1, tvb_get_guint8(tvb, offset) );
 364         offset += 1;
 365
 366         while(num--){
 367                 proto_tree_add_uint(tree, hf_rx_ack_type, tvb,
 368                         offset, 1, tvb_get_guint8(tvb, offset) );
 369                 offset += 1;
 370         }
 371
 372         /* Some implementations adds some extra fields.
 373          * As far as I can see, these first add 3 padding bytes and then
 374          * up to 4 32-bit values. (0,3,4 have been witnessed)
 375          *
 376          * RX as a protocol seems to be completely nondefined and seems to lack
 377          * any sort of documentation other than "read the source of any of the
 378          * (compatible?) implementations.
 379          */
 380         if (tvb_length_remaining(tvb, offset)>3) {
 381                 offset += 3;    /* guess. some implementations adds 3 bytes */
 382
 383                 if (tvb_length_remaining(tvb, offset) >= 4){
 384                         proto_tree_add_uint(tree, hf_rx_ifmtu, tvb, offset, 4,
 385                                 tvb_get_ntohl(tvb, offset));
 386                         offset += 4;
 387                 }
 388                 if (tvb_length_remaining(tvb, offset) >= 4){
 389                         proto_tree_add_uint(tree, hf_rx_maxmtu, tvb, offset, 4,
 390                                 tvb_get_ntohl(tvb, offset));
 391                         offset += 4;
 392                 }
 393                 if (tvb_length_remaining(tvb, offset) >= 4){
 394                         proto_tree_add_uint(tree, hf_rx_rwind, tvb, offset, 4,
 395                                 tvb_get_ntohl(tvb, offset));
 396                         offset += 4;
 397                 }
 398                 if (tvb_length_remaining(tvb, offset) >= 4){
 399                         proto_tree_add_uint(tree, hf_rx_maxpackets, tvb, offset, 4,
 400                                 tvb_get_ntohl(tvb, offset));
 401                         offset += 4;
 402                 }
 403         }
 404
 405         proto_item_set_len(item, offset-old_offset);
 406         return offset;
 407 }
 408
 409
 410 static int
 411 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 412 {
 413         proto_tree *tree;
 414         proto_item *item;
 415         guint8 flags;
 416
 417         flags = tvb_get_guint8(tvb, offset);
 418         rxinfo->flags = flags;
 419
 420         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 421                 offset, 1, flags);
 422         tree = proto_item_add_subtree(item, ett_rx_flags);
 423
 424         proto_tree_add_uint(tree, hf_rx_flags_free_packet, tvb,
 425                 offset, 1, flags);
 426         proto_tree_add_uint(tree, hf_rx_flags_more_packets, tvb,
 427                 offset, 1, flags);
 428         proto_tree_add_uint(tree, hf_rx_flags_last_packet, tvb,
 429                 offset, 1, flags);
 430         proto_tree_add_uint(tree, hf_rx_flags_request_ack, tvb,
 431                 offset, 1, flags);
 432         proto_tree_add_uint(tree, hf_rx_flags_clientinit, tvb,
 433                 offset, 1, flags);
 434
 435         offset += 1;
 436         return offset;
 437 }
 438
 439 static void
 440 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 441 {
 442         proto_tree *tree;
 443         proto_item *item;
 444         int offset = 0;
 445         struct rxinfo rxinfo;
 446         guint8 type;
 447         guint32 seq, callnumber;
 448         guint16 serviceid;
 449
 450         if (check_col(pinfo->fd, COL_PROTOCOL))
 451                 col_set_str(pinfo->fd, COL_PROTOCOL, "RX");
 452         if (check_col(pinfo->fd, COL_INFO))
 453                 col_clear(pinfo->fd, COL_INFO);
 454
 455         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 456                 offset, 28, "RX Protocol");
 457         tree = proto_item_add_subtree(item, ett_rx);
 458
 459         /* epoch : 4 bytes */
 460         {
 461                 struct timeval tv;
 462                 tv.tv_sec = tvb_get_ntohl(tvb, offset);
 463                 tv.tv_usec = 0;
 464
 465                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 466                         offset, 4, &tv);
 467                 offset += 4;
 468         }
 469
 470         /* cid : 4 bytes */
 471         proto_tree_add_uint(tree, hf_rx_cid, tvb,
 472                 offset, 4, tvb_get_ntohl(tvb, offset));
 473         offset += 4;
 474
 475         /* callnumber : 4 bytes */
 476         callnumber = tvb_get_ntohl(tvb, offset);
 477         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 478                 offset, 4, callnumber);
 479         offset += 4;
 480         rxinfo.callnumber = callnumber;
 481
 482         /* seq : 4 bytes */
 483         seq = tvb_get_ntohl(tvb, offset);
 484         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 485                 offset, 4, seq);
 486         offset += 4;
 487         rxinfo.seq = seq;
 488
 489         /* serial : 4 bytes */
 490         proto_tree_add_uint(tree, hf_rx_serial, tvb,
 491                 offset, 4, tvb_get_ntohl(tvb, offset));
 492         offset += 4;
 493
 494         /* type : 1 byte */
 495         type = tvb_get_guint8(tvb, offset);
 496         proto_tree_add_uint(tree, hf_rx_type, tvb,
 497                 offset, 1, type);
 498         offset += 1;
 499         rxinfo.type = type;
 500
 501         /* flags : 1 byte */
 502         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 503
 504         /* userstatus : 1 byte */
 505         proto_tree_add_uint(tree, hf_rx_userstatus, tvb,
 506                 offset, 1, tvb_get_guint8(tvb, offset));
 507         offset += 1;
 508
 509         /* sequrityindex : 1 byte */
 510         proto_tree_add_uint(tree, hf_rx_securityindex, tvb,
 511                 offset, 1, tvb_get_guint8(tvb, offset));
 512         offset += 1;
 513
 514         /* spare */
 515         proto_tree_add_uint(tree, hf_rx_spare, tvb,
 516                 offset, 2, tvb_get_ntohs(tvb, offset));
 517         offset += 2;
 518
 519         /* service id : 2 bytes */
 520         serviceid = tvb_get_ntohs(tvb, offset);
 521         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 522                 offset, 2, serviceid);
 523         offset += 2;
 524         rxinfo.serviceid = serviceid;
 525
 526         switch (type) {
 527         case RX_PACKET_TYPE_ACK:
 528                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 529                         cant create it in a parallell tree, then ett seasrch
 530                         wont work */
 531                 dissect_rx_acks(tvb, pinfo, tree, offset,
 532                         seq, callnumber);
 533                 break;
 534         case RX_PACKET_TYPE_ACKALL:
 535                 /* does not contain any payload */
 536                 if (check_col(pinfo->fd, COL_INFO)) {
 537                         col_add_fstr(pinfo->fd, COL_INFO,
 538                                 "ACKALL  "
 539                                 "Seq: %lu  "
 540                                 "Call: %lu  "
 541                                 "Source Port: %s  "
 542                                 "Destination Port: %s  ",
 543                                 (unsigned long)seq,
 544                                 (unsigned long)callnumber,
 545                                 get_udp_port(pinfo->srcport),
 546                                 get_udp_port(pinfo->destport)
 547                         );
 548                 }
 549                 break;
 550         case RX_PACKET_TYPE_CHALLENGE:
 551                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 552                 break;
 553         case RX_PACKET_TYPE_RESPONSE:
 554                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 555                 break;
 556         case RX_PACKET_TYPE_DATA: {
 557                 tvbuff_t *next_tvb;
 558                 pinfo->private = &rxinfo;
 559                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 560                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 561                 };
 562                 break;
 563         }
 564
 565 }
 566
 567 void
 568 proto_register_rx(void)
 569 {
 570         static hf_register_info hf[] = {
 571                 { &hf_rx_epoch, {
 572                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_DEC,
 573                         NULL, 0, "Epoch", HFILL }},
 574
 575                 { &hf_rx_cid, {
 576                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 577                         NULL, 0, "CID", HFILL }},
 578
 579                 { &hf_rx_callnumber, {
 580                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 581                         NULL, 0, "Call Number", HFILL }},
 582
 583                 { &hf_rx_seq, {
 584                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 585                         NULL, 0, "Sequence Number", HFILL }},
 586
 587                 { &hf_rx_serial, {
 588                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 589                         NULL, 0, "Serial", HFILL }},
 590
 591                 { &hf_rx_type, {
 592                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 593                         VALS(rx_types), 0, "Type", HFILL }},
 594
 595                 { &hf_rx_flags, {
 596                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 597                         NULL, 0, "Flags", HFILL }},
 598
 599                 { &hf_rx_flags_clientinit, {
 600                         "Client Initiated", "rx.flags.client_init", FT_UINT8, BASE_BIN,
 601                         NULL, RX_CLIENT_INITIATED, "Client Initiated", HFILL }},
 602
 603                 { &hf_rx_flags_request_ack, {
 604                         "Request Ack", "rx.flags.request_ack", FT_UINT8, BASE_BIN,
 605                         NULL, RX_REQUEST_ACK, "Request Ack", HFILL }},
 606
 607                 { &hf_rx_flags_last_packet, {
 608                         "Last Packet", "rx.flags.last_packet", FT_UINT8, BASE_BIN,
 609                         NULL, RX_LAST_PACKET, "Last Packet", HFILL }},
 610
 611                 { &hf_rx_flags_more_packets, {
 612                         "More Packets", "rx.flags.more_packets", FT_UINT8, BASE_BIN,
 613                         NULL, RX_MORE_PACKETS, "More Packets", HFILL }},
 614
 615                 { &hf_rx_flags_free_packet, {
 616                         "Free Packet", "rx.flags.free_packet", FT_UINT8, BASE_BIN,
 617                         NULL, RX_FREE_PACKET, "Free Packet", HFILL }},
 618
 619                 { &hf_rx_userstatus, {
 620                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 621                         NULL, 0, "User Status", HFILL }},
 622
 623                 { &hf_rx_securityindex, {
 624                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 625                         NULL, 0, "Security Index", HFILL }},
 626
 627                 { &hf_rx_spare, {
 628                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 629                         NULL, 0, "Spare/Checksum", HFILL }},
 630
 631                 { &hf_rx_serviceid, {
 632                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 633                         NULL, 0, "Service ID", HFILL }},
 634
 635                 { &hf_rx_bufferspace, {
 636                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 637                         NULL, 0, "Number Of Packets Available", HFILL }},
 638
 639                 { &hf_rx_maxskew, {
 640                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 641                         NULL, 0, "Max Skew", HFILL }},
 642
 643                 { &hf_rx_first_packet, {
 644                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 645                         NULL, 0, "First Packet", HFILL }},
 646
 647                 { &hf_rx_prev_packet, {
 648                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 649                         NULL, 0, "Previous Packet", HFILL }},
 650
 651                 { &hf_rx_reason, {
 652                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 653                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 654
 655                 { &hf_rx_numacks, {
 656                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 657                         NULL, 0, "Number Of ACKs", HFILL }},
 658
 659                 { &hf_rx_ack_type, {
 660                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 661                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 662
 663                 { &hf_rx_ack, {
 664                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 665                         NULL, 0, "ACK Packet", HFILL }},
 666
 667                 { &hf_rx_challenge, {
 668                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 669                         NULL, 0, "CHALLENGE Packet", HFILL }},
 670
 671                 { &hf_rx_version, {
 672                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 673                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 674
 675                 { &hf_rx_nonce, {
 676                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 677                         NULL, 0, "Nonce", HFILL }},
 678
 679                 { &hf_rx_inc_nonce, {
 680                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 681                         NULL, 0, "Incremented Nonce", HFILL }},
 682
 683                 { &hf_rx_min_level, {
 684                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 685                         NULL, 0, "Min Level", HFILL }},
 686
 687                 { &hf_rx_level, {
 688                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 689                         NULL, 0, "Level", HFILL }},
 690
 691                 { &hf_rx_response, {
 692                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 693                         NULL, 0, "RESPONSE Packet", HFILL }},
 694
 695                 { &hf_rx_encrypted, {
 696                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 697                         NULL, 0, "Encrypted part of response packet", HFILL }},
 698
 699                 { &hf_rx_kvno, {
 700                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 701                         NULL, 0, "kvno", HFILL }},
 702
 703                 { &hf_rx_ticket_len, {
 704                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 705                         NULL, 0, "Ticket Length", HFILL }},
 706
 707                 { &hf_rx_ticket, {
 708                         "ticket", "rx.ticket", FT_BYTES, BASE_HEX,
 709                         NULL, 0, "Ticket", HFILL }},
 710
 711                 { &hf_rx_ifmtu, {
 712                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 713                         NULL, 0, "Interface MTU", HFILL }},
 714
 715                 { &hf_rx_maxmtu, {
 716                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 717                         NULL, 0, "Max MTU", HFILL }},
 718
 719                 { &hf_rx_rwind, {
 720                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 721                         NULL, 0, "rwind", HFILL }},
 722
 723                 { &hf_rx_maxpackets, {
 724                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 725                         NULL, 0, "Max Packets", HFILL }},
 726
 727         };
 728         static gint *ett[] = {
 729                 &ett_rx,
 730                 &ett_rx_flags,
 731                 &ett_rx_ack,
 732                 &ett_rx_challenge,
 733                 &ett_rx_response,
 734                 &ett_rx_encrypted,
 735         };
 736
 737         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 738         proto_register_field_array(proto_rx, hf, array_length(hf));
 739         proto_register_subtree_array(ett, array_length(ett));
 740 }
 741
 742 void
 743 proto_reg_handoff_rx(void)
 744 {
 745         int port;
 746
 747         /*
 748          * Get handle for the AFS dissector.
 749          */
 750         afs_handle = find_dissector("afs");
 751
 752         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 753            are all used for various AFS services. */
 754         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 755                 dissector_add("udp.port", port, dissect_rx, proto_rx);
 756         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, dissect_rx,
 757             proto_rx);
 758 }