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 1.26 2001/09/14 07:10:05 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                 nstime_t ts;
 160                 ts.secs = tvb_get_ntohl(tvb, offset);
 161                 ts.nsecs = 0;
 162
 163                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 164                         offset, 4, &ts);
 165                 offset += 4;
 166         }
 167
 168         /* cid : 4 bytes */
 169         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 170         offset += 4;
 171
 172         /*FIXME dont know how to handle this checksum, skipping it */
 173         offset += 4;
 174
 175         /* sequrityindex : 1 byte */
 176         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 177         offset += 4;
 178
 179         for (i=0; i<RX_MAXCALLS; i++) {
 180                 /* callnumber : 4 bytes */
 181                 callnumber = tvb_get_ntohl(tvb, offset);
 182                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 183                         offset, 4, callnumber);
 184                 offset += 4;
 185         }
 186
 187         /* inc nonce : 4 bytes */
 188         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 189         offset += 4;
 190
 191         /* level : 4 bytes */
 192         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 193         offset += 4;
 194
 195         proto_item_set_len(item, offset-old_offset);
 196         return offset;
 197 }
 198
 199
 200 static int
 201 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 202 {
 203         proto_tree *tree;
 204         proto_item *item;
 205         guint32 version, tl;
 206         int old_offset=offset;
 207
 208         if (check_col(pinfo->fd, COL_INFO)) {
 209                 col_add_fstr(pinfo->fd, COL_INFO,
 210                         "RESPONSE  "
 211                         "Seq: %lu  "
 212                         "Call: %lu  "
 213                         "Source Port: %s  "
 214                         "Destination Port: %s  ",
 215                         (unsigned long)seq,
 216                         (unsigned long)callnumber,
 217                         get_udp_port(pinfo->srcport),
 218                         get_udp_port(pinfo->destport)
 219                 );
 220         }
 221
 222         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, 0, FALSE);
 223         tree = proto_item_add_subtree(item, ett_rx_response);
 224
 225         version = tvb_get_ntohl(tvb, offset);
 226         proto_tree_add_uint(tree, hf_rx_version, tvb,
 227                 offset, 4, version);
 228         offset += 4;
 229
 230         if (version==2) {
 231                 /* skip unused */
 232                 offset += 4;
 233
 234                 /* encrypted : struct */
 235                 offset = dissect_rx_response_encrypted(tvb, pinfo, tree, offset);
 236
 237                 /* kvno */
 238                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 239                 offset += 4;
 240
 241                 /* ticket_len */
 242                 tl = tvb_get_ntohl(tvb, offset);
 243                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 244                         offset, 4, tl);
 245                 offset += 4;
 246
 247                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 248                 offset += tl;
 249         }
 250
 251         proto_item_set_len(item, offset-old_offset);
 252         return offset;
 253 }
 254
 255 static int
 256 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 257 {
 258         proto_tree *tree;
 259         proto_item *item;
 260         guint32 version;
 261         int old_offset=offset;
 262
 263         if (check_col(pinfo->fd, COL_INFO)) {
 264                 col_add_fstr(pinfo->fd, COL_INFO,
 265                         "CHALLENGE  "
 266                         "Seq: %lu  "
 267                         "Call: %lu  "
 268                         "Source Port: %s  "
 269                         "Destination Port: %s  ",
 270                         (unsigned long)seq,
 271                         (unsigned long)callnumber,
 272                         get_udp_port(pinfo->srcport),
 273                         get_udp_port(pinfo->destport)
 274                 );
 275         }
 276
 277         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, 0, FALSE);
 278         tree = proto_item_add_subtree(item, ett_rx_challenge);
 279
 280         version = tvb_get_ntohl(tvb, offset);
 281         proto_tree_add_uint(tree, hf_rx_version, tvb,
 282                 offset, 4, version);
 283         offset += 4;
 284
 285         if (version==2) {
 286                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 287                 offset += 4;
 288
 289                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 290                 offset += 4;
 291         }
 292
 293         proto_item_set_len(item, offset-old_offset);
 294         return offset;
 295 }
 296
 297 static int
 298 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 299 {
 300         proto_tree *tree;
 301         proto_item *item;
 302         guint8 num;
 303         int old_offset = offset;
 304
 305         if (check_col(pinfo->fd, COL_INFO)) {
 306                 col_add_fstr(pinfo->fd, COL_INFO,
 307                         "ACK  "
 308                         "Seq: %lu  "
 309                         "Call: %lu  "
 310                         "Source Port: %s  "
 311                         "Destination Port: %s  ",
 312                         (unsigned long)seq,
 313                         (unsigned long)callnumber,
 314                         get_udp_port(pinfo->srcport),
 315                         get_udp_port(pinfo->destport)
 316                 );
 317         }
 318
 319         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, 0, FALSE);
 320         tree = proto_item_add_subtree(item, ett_rx_ack);
 321
 322
 323         /* bufferspace: 2 bytes*/
 324         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 325         offset += 2;
 326
 327         /* maxskew: 2 bytes*/
 328         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 329         offset += 2;
 330
 331         /* first packet: 4 bytes*/
 332         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 333         offset += 4;
 334
 335         /* prev packet: 4 bytes*/
 336         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 337         offset += 4;
 338
 339         /* serial : 4 bytes */
 340         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 341         offset += 4;
 342
 343         /* reason : 1 byte */
 344         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 345         offset += 1;
 346
 347         /* nACKs */
 348         num = tvb_get_guint8(tvb, offset);
 349         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 350         offset += 1;
 351
 352         while(num--){
 353                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 354                         FALSE);
 355                 offset += 1;
 356         }
 357
 358         /* Some implementations adds some extra fields.
 359          * As far as I can see, these first add 3 padding bytes and then
 360          * up to 4 32-bit values. (0,3,4 have been witnessed)
 361          *
 362          * RX as a protocol seems to be completely nondefined and seems to lack
 363          * any sort of documentation other than "read the source of any of the
 364          * (compatible?) implementations.
 365          */
 366         if (tvb_length_remaining(tvb, offset)>3) {
 367                 offset += 3;    /* guess. some implementations adds 3 bytes */
 368
 369                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 370                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 371                                 FALSE);
 372                         offset += 4;
 373                 }
 374                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 375                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 376                                 FALSE);
 377                         offset += 4;
 378                 }
 379                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 380                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 381                                 FALSE);
 382                         offset += 4;
 383                 }
 384                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 385                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 386                                 FALSE);
 387                         offset += 4;
 388                 }
 389         }
 390
 391         proto_item_set_len(item, offset-old_offset);
 392         return offset;
 393 }
 394
 395
 396 static int
 397 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 398 {
 399         proto_tree *tree;
 400         proto_item *item;
 401         guint8 flags;
 402
 403         flags = tvb_get_guint8(tvb, offset);
 404         rxinfo->flags = flags;
 405
 406         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 407                 offset, 1, flags);
 408         tree = proto_item_add_subtree(item, ett_rx_flags);
 409
 410         proto_tree_add_uint(tree, hf_rx_flags_free_packet, tvb,
 411                 offset, 1, flags);
 412         proto_tree_add_uint(tree, hf_rx_flags_more_packets, tvb,
 413                 offset, 1, flags);
 414         proto_tree_add_uint(tree, hf_rx_flags_last_packet, tvb,
 415                 offset, 1, flags);
 416         proto_tree_add_uint(tree, hf_rx_flags_request_ack, tvb,
 417                 offset, 1, flags);
 418         proto_tree_add_uint(tree, hf_rx_flags_clientinit, tvb,
 419                 offset, 1, flags);
 420
 421         offset += 1;
 422         return offset;
 423 }
 424
 425 static void
 426 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 427 {
 428         proto_tree *tree;
 429         proto_item *item;
 430         int offset = 0;
 431         struct rxinfo rxinfo;
 432         guint8 type;
 433         guint32 seq, callnumber;
 434         guint16 serviceid;
 435
 436         if (check_col(pinfo->fd, COL_PROTOCOL))
 437                 col_set_str(pinfo->fd, COL_PROTOCOL, "RX");
 438         if (check_col(pinfo->fd, COL_INFO))
 439                 col_clear(pinfo->fd, COL_INFO);
 440
 441         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 442                 offset, 28, "RX Protocol");
 443         tree = proto_item_add_subtree(item, ett_rx);
 444
 445         /* epoch : 4 bytes */
 446         {
 447                 nstime_t ts;;
 448                 ts.secs = tvb_get_ntohl(tvb, offset);
 449                 ts.nsecs = 0;
 450
 451                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 452                         offset, 4, &ts);
 453                 offset += 4;
 454         }
 455
 456         /* cid : 4 bytes */
 457         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 458         offset += 4;
 459
 460         /* callnumber : 4 bytes */
 461         callnumber = tvb_get_ntohl(tvb, offset);
 462         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 463                 offset, 4, callnumber);
 464         offset += 4;
 465         rxinfo.callnumber = callnumber;
 466
 467         /* seq : 4 bytes */
 468         seq = tvb_get_ntohl(tvb, offset);
 469         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 470                 offset, 4, seq);
 471         offset += 4;
 472         rxinfo.seq = seq;
 473
 474         /* serial : 4 bytes */
 475         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 476         offset += 4;
 477
 478         /* type : 1 byte */
 479         type = tvb_get_guint8(tvb, offset);
 480         proto_tree_add_uint(tree, hf_rx_type, tvb,
 481                 offset, 1, type);
 482         offset += 1;
 483         rxinfo.type = type;
 484
 485         /* flags : 1 byte */
 486         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 487
 488         /* userstatus : 1 byte */
 489         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 490         offset += 1;
 491
 492         /* sequrityindex : 1 byte */
 493         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 494         offset += 1;
 495
 496         /*
 497          * How clever: even though the AFS header files indicate that the
 498          * serviceId is first, it's really encoded _after_ the spare field.
 499          * I wasted a day figuring that out!
 500          */
 501
 502         /* spare */
 503         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 504         offset += 2;
 505
 506         /* service id : 2 bytes */
 507         serviceid = tvb_get_ntohs(tvb, offset);
 508         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 509                 offset, 2, serviceid);
 510         offset += 2;
 511         rxinfo.serviceid = serviceid;
 512
 513         switch (type) {
 514         case RX_PACKET_TYPE_ACK:
 515                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 516                         cant create it in a parallell tree, then ett seasrch
 517                         wont work */
 518                 dissect_rx_acks(tvb, pinfo, tree, offset,
 519                         seq, callnumber);
 520                 break;
 521         case RX_PACKET_TYPE_ACKALL:
 522                 /* does not contain any payload */
 523                 if (check_col(pinfo->fd, COL_INFO)) {
 524                         col_add_fstr(pinfo->fd, COL_INFO,
 525                                 "ACKALL  "
 526                                 "Seq: %lu  "
 527                                 "Call: %lu  "
 528                                 "Source Port: %s  "
 529                                 "Destination Port: %s  ",
 530                                 (unsigned long)seq,
 531                                 (unsigned long)callnumber,
 532                                 get_udp_port(pinfo->srcport),
 533                                 get_udp_port(pinfo->destport)
 534                         );
 535                 }
 536                 break;
 537         case RX_PACKET_TYPE_CHALLENGE:
 538                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 539                 break;
 540         case RX_PACKET_TYPE_RESPONSE:
 541                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 542                 break;
 543         case RX_PACKET_TYPE_DATA: {
 544                 tvbuff_t *next_tvb;
 545                 pinfo->private = &rxinfo;
 546                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 547                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 548                 };
 549                 break;
 550         }
 551
 552 }
 553
 554 void
 555 proto_register_rx(void)
 556 {
 557         static hf_register_info hf[] = {
 558                 { &hf_rx_epoch, {
 559                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_DEC,
 560                         NULL, 0, "Epoch", HFILL }},
 561
 562                 { &hf_rx_cid, {
 563                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 564                         NULL, 0, "CID", HFILL }},
 565
 566                 { &hf_rx_callnumber, {
 567                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 568                         NULL, 0, "Call Number", HFILL }},
 569
 570                 { &hf_rx_seq, {
 571                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 572                         NULL, 0, "Sequence Number", HFILL }},
 573
 574                 { &hf_rx_serial, {
 575                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 576                         NULL, 0, "Serial", HFILL }},
 577
 578                 { &hf_rx_type, {
 579                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 580                         VALS(rx_types), 0, "Type", HFILL }},
 581
 582                 { &hf_rx_flags, {
 583                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 584                         NULL, 0, "Flags", HFILL }},
 585
 586                 { &hf_rx_flags_clientinit, {
 587                         "Client Initiated", "rx.flags.client_init", FT_UINT8, BASE_BIN,
 588                         NULL, RX_CLIENT_INITIATED, "Client Initiated", HFILL }},
 589
 590                 { &hf_rx_flags_request_ack, {
 591                         "Request Ack", "rx.flags.request_ack", FT_UINT8, BASE_BIN,
 592                         NULL, RX_REQUEST_ACK, "Request Ack", HFILL }},
 593
 594                 { &hf_rx_flags_last_packet, {
 595                         "Last Packet", "rx.flags.last_packet", FT_UINT8, BASE_BIN,
 596                         NULL, RX_LAST_PACKET, "Last Packet", HFILL }},
 597
 598                 { &hf_rx_flags_more_packets, {
 599                         "More Packets", "rx.flags.more_packets", FT_UINT8, BASE_BIN,
 600                         NULL, RX_MORE_PACKETS, "More Packets", HFILL }},
 601
 602                 { &hf_rx_flags_free_packet, {
 603                         "Free Packet", "rx.flags.free_packet", FT_UINT8, BASE_BIN,
 604                         NULL, RX_FREE_PACKET, "Free Packet", HFILL }},
 605
 606                 { &hf_rx_userstatus, {
 607                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 608                         NULL, 0, "User Status", HFILL }},
 609
 610                 { &hf_rx_securityindex, {
 611                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 612                         NULL, 0, "Security Index", HFILL }},
 613
 614                 { &hf_rx_spare, {
 615                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 616                         NULL, 0, "Spare/Checksum", HFILL }},
 617
 618                 { &hf_rx_serviceid, {
 619                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 620                         NULL, 0, "Service ID", HFILL }},
 621
 622                 { &hf_rx_bufferspace, {
 623                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 624                         NULL, 0, "Number Of Packets Available", HFILL }},
 625
 626                 { &hf_rx_maxskew, {
 627                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 628                         NULL, 0, "Max Skew", HFILL }},
 629
 630                 { &hf_rx_first_packet, {
 631                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 632                         NULL, 0, "First Packet", HFILL }},
 633
 634                 { &hf_rx_prev_packet, {
 635                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 636                         NULL, 0, "Previous Packet", HFILL }},
 637
 638                 { &hf_rx_reason, {
 639                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 640                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 641
 642                 { &hf_rx_numacks, {
 643                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 644                         NULL, 0, "Number Of ACKs", HFILL }},
 645
 646                 { &hf_rx_ack_type, {
 647                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 648                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 649
 650                 { &hf_rx_ack, {
 651                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 652                         NULL, 0, "ACK Packet", HFILL }},
 653
 654                 { &hf_rx_challenge, {
 655                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 656                         NULL, 0, "CHALLENGE Packet", HFILL }},
 657
 658                 { &hf_rx_version, {
 659                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 660                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 661
 662                 { &hf_rx_nonce, {
 663                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 664                         NULL, 0, "Nonce", HFILL }},
 665
 666                 { &hf_rx_inc_nonce, {
 667                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 668                         NULL, 0, "Incremented Nonce", HFILL }},
 669
 670                 { &hf_rx_min_level, {
 671                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 672                         NULL, 0, "Min Level", HFILL }},
 673
 674                 { &hf_rx_level, {
 675                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 676                         NULL, 0, "Level", HFILL }},
 677
 678                 { &hf_rx_response, {
 679                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 680                         NULL, 0, "RESPONSE Packet", HFILL }},
 681
 682                 { &hf_rx_encrypted, {
 683                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 684                         NULL, 0, "Encrypted part of response packet", HFILL }},
 685
 686                 { &hf_rx_kvno, {
 687                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 688                         NULL, 0, "kvno", HFILL }},
 689
 690                 { &hf_rx_ticket_len, {
 691                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 692                         NULL, 0, "Ticket Length", HFILL }},
 693
 694                 { &hf_rx_ticket, {
 695                         "ticket", "rx.ticket", FT_BYTES, BASE_HEX,
 696                         NULL, 0, "Ticket", HFILL }},
 697
 698                 { &hf_rx_ifmtu, {
 699                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 700                         NULL, 0, "Interface MTU", HFILL }},
 701
 702                 { &hf_rx_maxmtu, {
 703                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 704                         NULL, 0, "Max MTU", HFILL }},
 705
 706                 { &hf_rx_rwind, {
 707                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 708                         NULL, 0, "rwind", HFILL }},
 709
 710                 { &hf_rx_maxpackets, {
 711                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 712                         NULL, 0, "Max Packets", HFILL }},
 713
 714         };
 715         static gint *ett[] = {
 716                 &ett_rx,
 717                 &ett_rx_flags,
 718                 &ett_rx_ack,
 719                 &ett_rx_challenge,
 720                 &ett_rx_response,
 721                 &ett_rx_encrypted,
 722         };
 723
 724         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 725         proto_register_field_array(proto_rx, hf, array_length(hf));
 726         proto_register_subtree_array(ett, array_length(ett));
 727 }
 728
 729 void
 730 proto_reg_handoff_rx(void)
 731 {
 732         int port;
 733
 734         /*
 735          * Get handle for the AFS dissector.
 736          */
 737         afs_handle = find_dissector("afs");
 738
 739         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 740            are all used for various AFS services. */
 741         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 742                 dissector_add("udp.port", port, dissect_rx, proto_rx);
 743         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, dissect_rx,
 744             proto_rx);
 745 }