epan/dissectors/packet-rx.c

   1 /* packet-rx.c
   2  * Routines for RX packet dissection
   3  * Copyright 1999, Nathan Neulinger <nneul@umr.edu>
   4  * Based on routines from tcpdump patches by
   5  *   Ken Hornstein <kenh@cmf.nrl.navy.mil>
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * Copied from packet-tftp.c
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <glib.h>
  35 #include <epan/packet.h>
  36 #include "packet-rx.h"
  37 #include <epan/addr_resolv.h>
  38
  39 /*
  40  * See
  41  *
  42  *      http://web.mit.edu/kolya/afs/rx/rx-spec
  43  *
  44  * XXX - is the "Epoch" really a UN*X time?  The high-order bit, according
  45  * to that spec, is a flag bit.
  46  */
  47
  48 #define UDP_PORT_RX_LOW         7000
  49 #define UDP_PORT_RX_HIGH        7009
  50 #define UDP_PORT_RX_AFS_BACKUPS 7021
  51
  52 static const value_string rx_types[] = {
  53         { RX_PACKET_TYPE_DATA,          "data" },
  54         { RX_PACKET_TYPE_ACK,           "ack" },
  55         { RX_PACKET_TYPE_BUSY,          "busy" },
  56         { RX_PACKET_TYPE_ABORT,         "abort" },
  57         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  58         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  59         { RX_PACKET_TYPE_RESPONSE,      "response" },
  60         { RX_PACKET_TYPE_DEBUG,         "debug" },
  61         { RX_PACKET_TYPE_PARAMS,        "params" },
  62         { RX_PACKET_TYPE_VERSION,       "version" },
  63         { 0,                            NULL },
  64 };
  65
  66 static const value_string rx_reason[] = {
  67         { RX_ACK_REQUESTED,             "Ack Requested"         },
  68         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  69         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  70         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  71         { RX_ACK_NOSPACE,               "No Space"              },
  72         { RX_ACK_PING,                  "Ping"                  },
  73         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  74         { RX_ACK_DELAY,                 "Delay"                 },
  75         { RX_ACK_IDLE,                  "Idle"                  },
  76         { 0,                            NULL                    }
  77 };
  78
  79 static const value_string rx_ack_type[] = {
  80         { RX_ACK_TYPE_NACK,     "NACK"  },
  81         { RX_ACK_TYPE_ACK,      "ACK"   },
  82         { 0,                    NULL    }
  83 };
  84
  85 static int proto_rx = -1;
  86 static int hf_rx_epoch = -1;
  87 static int hf_rx_cid = -1;
  88 static int hf_rx_seq = -1;
  89 static int hf_rx_serial = -1;
  90 static int hf_rx_callnumber = -1;
  91 static int hf_rx_type = -1;
  92 static int hf_rx_flags = -1;
  93 static int hf_rx_flags_clientinit = -1;
  94 static int hf_rx_flags_request_ack = -1;
  95 static int hf_rx_flags_last_packet = -1;
  96 static int hf_rx_flags_more_packets = -1;
  97 static int hf_rx_flags_free_packet = -1;
  98 static int hf_rx_userstatus = -1;
  99 static int hf_rx_securityindex = -1;
 100 static int hf_rx_spare = -1;
 101 static int hf_rx_serviceid = -1;
 102 static int hf_rx_bufferspace = -1;
 103 static int hf_rx_maxskew = -1;
 104 static int hf_rx_first_packet = -1;
 105 static int hf_rx_prev_packet = -1;
 106 static int hf_rx_reason = -1;
 107 static int hf_rx_numacks = -1;
 108 static int hf_rx_ack_type = -1;
 109 static int hf_rx_ack = -1;
 110 static int hf_rx_challenge = -1;
 111 static int hf_rx_version = -1;
 112 static int hf_rx_nonce = -1;
 113 static int hf_rx_inc_nonce = -1;
 114 static int hf_rx_min_level = -1;
 115 static int hf_rx_level = -1;
 116 static int hf_rx_response = -1;
 117 static int hf_rx_encrypted = -1;
 118 static int hf_rx_kvno = -1;
 119 static int hf_rx_ticket_len = -1;
 120 static int hf_rx_ticket = -1;
 121 static int hf_rx_ifmtu = -1;
 122 static int hf_rx_maxmtu = -1;
 123 static int hf_rx_rwind = -1;
 124 static int hf_rx_maxpackets = -1;
 125 static int hf_rx_abort = -1;
 126 static int hf_rx_abortcode = -1;
 127
 128 static gint ett_rx = -1;
 129 static gint ett_rx_flags = -1;
 130 static gint ett_rx_ack = -1;
 131 static gint ett_rx_challenge = -1;
 132 static gint ett_rx_response = -1;
 133 static gint ett_rx_encrypted = -1;
 134 static gint ett_rx_abort = -1;
 135
 136 static dissector_handle_t afs_handle;
 137
 138 static int
 139 dissect_rx_response_encrypted(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 140 {
 141         proto_tree *tree;
 142         proto_item *item;
 143         int old_offset=offset;
 144         int i;
 145         guint32 callnumber;
 146
 147         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, FALSE);
 148         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 149
 150         /* epoch : 4 bytes */
 151         {
 152                 nstime_t ts;
 153                 ts.secs = tvb_get_ntohl(tvb, offset);
 154                 ts.nsecs = 0;
 155
 156                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 157                         offset, 4, &ts);
 158                 offset += 4;
 159         }
 160
 161         /* cid : 4 bytes */
 162         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 163         offset += 4;
 164
 165         /*FIXME dont know how to handle this checksum, skipping it */
 166         offset += 4;
 167
 168         /* sequrityindex : 1 byte */
 169         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 170         offset += 4;
 171
 172         for (i=0; i<RX_MAXCALLS; i++) {
 173                 /* callnumber : 4 bytes */
 174                 callnumber = tvb_get_ntohl(tvb, offset);
 175                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 176                         offset, 4, callnumber);
 177                 offset += 4;
 178         }
 179
 180         /* inc nonce : 4 bytes */
 181         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 182         offset += 4;
 183
 184         /* level : 4 bytes */
 185         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 186         offset += 4;
 187
 188         proto_item_set_len(item, offset-old_offset);
 189         return offset;
 190 }
 191
 192
 193 static int
 194 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 195 {
 196         proto_tree *tree;
 197         proto_item *item;
 198         guint32 version, tl;
 199         int old_offset=offset;
 200
 201         if (check_col(pinfo->cinfo, COL_INFO)) {
 202                 col_add_fstr(pinfo->cinfo, COL_INFO,
 203                         "RESPONSE  "
 204                         "Seq: %lu  "
 205                         "Call: %lu  "
 206                         "Source Port: %s  "
 207                         "Destination Port: %s  ",
 208                         (unsigned long)seq,
 209                         (unsigned long)callnumber,
 210                         get_udp_port(pinfo->srcport),
 211                         get_udp_port(pinfo->destport)
 212                 );
 213         }
 214
 215         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, FALSE);
 216         tree = proto_item_add_subtree(item, ett_rx_response);
 217
 218         version = tvb_get_ntohl(tvb, offset);
 219         proto_tree_add_uint(tree, hf_rx_version, tvb,
 220                 offset, 4, version);
 221         offset += 4;
 222
 223         if (version==2) {
 224                 /* skip unused */
 225                 offset += 4;
 226
 227                 /* encrypted : struct */
 228                 offset = dissect_rx_response_encrypted(tvb, tree, offset);
 229
 230                 /* kvno */
 231                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 232                 offset += 4;
 233
 234                 /* ticket_len */
 235                 tl = tvb_get_ntohl(tvb, offset);
 236                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 237                         offset, 4, tl);
 238                 offset += 4;
 239
 240                 tvb_ensure_bytes_exist(tvb, offset, tl);
 241                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 242                 offset += tl;
 243         }
 244
 245         proto_item_set_len(item, offset-old_offset);
 246         return offset;
 247 }
 248
 249 static int
 250 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 251 {
 252         proto_tree *tree;
 253         proto_item *item;
 254         int old_offset=offset;
 255
 256         if (check_col(pinfo->cinfo, COL_INFO)) {
 257                 col_add_fstr(pinfo->cinfo, COL_INFO,
 258                         "ABORT  "
 259                         "Seq: %lu  "
 260                         "Call: %lu  "
 261                         "Source Port: %s  "
 262                         "Destination Port: %s  ",
 263                         (unsigned long)seq,
 264                         (unsigned long)callnumber,
 265                         get_udp_port(pinfo->srcport),
 266                         get_udp_port(pinfo->destport)
 267                 );
 268         }
 269
 270         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, FALSE);
 271         tree = proto_item_add_subtree(item, ett_rx_abort);
 272
 273         /* kvno */
 274         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, FALSE);
 275         offset += 4;
 276
 277         proto_item_set_len(item, offset-old_offset);
 278         return offset;
 279 }
 280
 281
 282 static int
 283 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 284 {
 285         proto_tree *tree;
 286         proto_item *item;
 287         guint32 version;
 288         int old_offset=offset;
 289
 290         if (check_col(pinfo->cinfo, COL_INFO)) {
 291                 col_add_fstr(pinfo->cinfo, COL_INFO,
 292                         "CHALLENGE  "
 293                         "Seq: %lu  "
 294                         "Call: %lu  "
 295                         "Source Port: %s  "
 296                         "Destination Port: %s  ",
 297                         (unsigned long)seq,
 298                         (unsigned long)callnumber,
 299                         get_udp_port(pinfo->srcport),
 300                         get_udp_port(pinfo->destport)
 301                 );
 302         }
 303
 304         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, FALSE);
 305         tree = proto_item_add_subtree(item, ett_rx_challenge);
 306
 307         version = tvb_get_ntohl(tvb, offset);
 308         proto_tree_add_uint(tree, hf_rx_version, tvb,
 309                 offset, 4, version);
 310         offset += 4;
 311
 312         if (version==2) {
 313                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 314                 offset += 4;
 315
 316                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 317                 offset += 4;
 318         }
 319
 320         proto_item_set_len(item, offset-old_offset);
 321         return offset;
 322 }
 323
 324 static int
 325 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 326 {
 327         proto_tree *tree;
 328         proto_item *item;
 329         guint8 num;
 330         int old_offset = offset;
 331
 332         if (check_col(pinfo->cinfo, COL_INFO)) {
 333                 col_add_fstr(pinfo->cinfo, COL_INFO,
 334                         "ACK  "
 335                         "Seq: %lu  "
 336                         "Call: %lu  "
 337                         "Source Port: %s  "
 338                         "Destination Port: %s  ",
 339                         (unsigned long)seq,
 340                         (unsigned long)callnumber,
 341                         get_udp_port(pinfo->srcport),
 342                         get_udp_port(pinfo->destport)
 343                 );
 344         }
 345
 346         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, FALSE);
 347         tree = proto_item_add_subtree(item, ett_rx_ack);
 348
 349
 350         /* bufferspace: 2 bytes*/
 351         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 352         offset += 2;
 353
 354         /* maxskew: 2 bytes*/
 355         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 356         offset += 2;
 357
 358         /* first packet: 4 bytes*/
 359         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 360         offset += 4;
 361
 362         /* prev packet: 4 bytes*/
 363         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 364         offset += 4;
 365
 366         /* serial : 4 bytes */
 367         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 368         offset += 4;
 369
 370         /* reason : 1 byte */
 371         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 372         offset += 1;
 373
 374         /* nACKs */
 375         num = tvb_get_guint8(tvb, offset);
 376         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 377         offset += 1;
 378
 379         while(num--){
 380                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 381                         FALSE);
 382                 offset += 1;
 383         }
 384
 385         /* Some implementations adds some extra fields.
 386          * As far as I can see, these first add 3 padding bytes and then
 387          * up to 4 32-bit values. (0,3,4 have been witnessed)
 388          *
 389          * RX as a protocol seems to be completely nondefined and seems to lack
 390          * any sort of documentation other than "read the source of any of the
 391          * (compatible?) implementations.
 392          */
 393         if (tvb_length_remaining(tvb, offset)>3) {
 394                 offset += 3;    /* guess. some implementations adds 3 bytes */
 395
 396                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 397                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 398                                 FALSE);
 399                         offset += 4;
 400                 }
 401                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 402                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 403                                 FALSE);
 404                         offset += 4;
 405                 }
 406                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 407                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 408                                 FALSE);
 409                         offset += 4;
 410                 }
 411                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 412                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 413                                 FALSE);
 414                         offset += 4;
 415                 }
 416         }
 417
 418         proto_item_set_len(item, offset-old_offset);
 419         return offset;
 420 }
 421
 422
 423 static int
 424 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 425 {
 426         proto_tree *tree;
 427         proto_item *item;
 428         guint8 flags;
 429
 430         flags = tvb_get_guint8(tvb, offset);
 431         rxinfo->flags = flags;
 432
 433         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 434                 offset, 1, flags);
 435         tree = proto_item_add_subtree(item, ett_rx_flags);
 436
 437         proto_tree_add_boolean(tree, hf_rx_flags_free_packet, tvb,
 438                 offset, 1, flags);
 439         proto_tree_add_boolean(tree, hf_rx_flags_more_packets, tvb,
 440                 offset, 1, flags);
 441         proto_tree_add_boolean(tree, hf_rx_flags_last_packet, tvb,
 442                 offset, 1, flags);
 443         proto_tree_add_boolean(tree, hf_rx_flags_request_ack, tvb,
 444                 offset, 1, flags);
 445         proto_tree_add_boolean(tree, hf_rx_flags_clientinit, tvb,
 446                 offset, 1, flags);
 447
 448         offset += 1;
 449         return offset;
 450 }
 451
 452 static int
 453 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 454 {
 455         proto_tree *tree;
 456         proto_item *item;
 457         int offset = 0;
 458         struct rxinfo rxinfo;
 459         guint8 type;
 460         nstime_t ts;
 461         guint32 seq, callnumber;
 462         guint16 serviceid;
 463
 464         /* Ensure we have enough data */
 465         if (tvb_length(tvb) < 28)
 466                 return 0;
 467
 468         /* Make sure it's a known type */
 469         type = tvb_get_guint8(tvb, 20);
 470         if (type == 0 || type == 10 || type == 11 || type == 12 || type > 13)
 471                 return 0;
 472
 473         col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 474         col_clear(pinfo->cinfo, COL_INFO);
 475
 476         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 477                 offset, 28, "RX Protocol");
 478         tree = proto_item_add_subtree(item, ett_rx);
 479
 480         /* epoch : 4 bytes */
 481         rxinfo.epoch = tvb_get_ntohl(tvb, offset);
 482         ts.secs = rxinfo.epoch;
 483         ts.nsecs = 0;
 484         proto_tree_add_time(tree, hf_rx_epoch, tvb, offset, 4, &ts);
 485         offset += 4;
 486
 487         /* cid : 4 bytes */
 488         rxinfo.cid = tvb_get_ntohl(tvb, offset);
 489         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 490         offset += 4;
 491
 492         /* callnumber : 4 bytes */
 493         callnumber = tvb_get_ntohl(tvb, offset);
 494         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 495                 offset, 4, callnumber);
 496         offset += 4;
 497         rxinfo.callnumber = callnumber;
 498
 499         /* seq : 4 bytes */
 500         seq = tvb_get_ntohl(tvb, offset);
 501         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 502                 offset, 4, seq);
 503         offset += 4;
 504         rxinfo.seq = seq;
 505
 506         /* serial : 4 bytes */
 507         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 508         offset += 4;
 509
 510         /* type : 1 byte */
 511         type = tvb_get_guint8(tvb, offset);
 512         proto_tree_add_uint(tree, hf_rx_type, tvb,
 513                 offset, 1, type);
 514         offset += 1;
 515         rxinfo.type = type;
 516
 517         /* flags : 1 byte */
 518         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 519
 520         /* userstatus : 1 byte */
 521         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 522         offset += 1;
 523
 524         /* sequrityindex : 1 byte */
 525         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 526         offset += 1;
 527
 528         /*
 529          * How clever: even though the AFS header files indicate that the
 530          * serviceId is first, it's really encoded _after_ the spare field.
 531          * I wasted a day figuring that out!
 532          */
 533
 534         /* spare */
 535         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 536         offset += 2;
 537
 538         /* service id : 2 bytes */
 539         serviceid = tvb_get_ntohs(tvb, offset);
 540         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 541                 offset, 2, serviceid);
 542         offset += 2;
 543         rxinfo.serviceid = serviceid;
 544
 545         switch (type) {
 546         case RX_PACKET_TYPE_ACK:
 547                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 548                         cant create it in a parallell tree, then ett seasrch
 549                         wont work */
 550                 dissect_rx_acks(tvb, pinfo, tree, offset,
 551                         seq, callnumber);
 552                 break;
 553         case RX_PACKET_TYPE_ACKALL:
 554                 /* does not contain any payload */
 555                 if (check_col(pinfo->cinfo, COL_INFO)) {
 556                         col_add_fstr(pinfo->cinfo, COL_INFO,
 557                                 "ACKALL  "
 558                                 "Seq: %lu  "
 559                                 "Call: %lu  "
 560                                 "Source Port: %s  "
 561                                 "Destination Port: %s  ",
 562                                 (unsigned long)seq,
 563                                 (unsigned long)callnumber,
 564                                 get_udp_port(pinfo->srcport),
 565                                 get_udp_port(pinfo->destport)
 566                         );
 567                 }
 568                 break;
 569         case RX_PACKET_TYPE_CHALLENGE:
 570                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 571                 break;
 572         case RX_PACKET_TYPE_RESPONSE:
 573                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 574                 break;
 575         case RX_PACKET_TYPE_DATA: {
 576                 tvbuff_t *next_tvb;
 577                 void* pd_save;
 578                 pd_save = pinfo->private_data;
 579                 pinfo->private_data = &rxinfo;
 580                 next_tvb = tvb_new_subset_remaining(tvb, offset);
 581                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 582                 pinfo->private_data = pd_save;
 583                 };
 584                 break;
 585         case RX_PACKET_TYPE_ABORT:
 586                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 587                 break;
 588         }
 589
 590         return(tvb_length(tvb));
 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, ABSOLUTE_TIME_LOCAL,
 599                         NULL, 0, NULL, HFILL }},
 600
 601                 { &hf_rx_cid, {
 602                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 603                         NULL, 0, NULL, HFILL }},
 604
 605                 { &hf_rx_callnumber, {
 606                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 607                         NULL, 0, NULL, HFILL }},
 608
 609                 { &hf_rx_seq, {
 610                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 611                         NULL, 0, NULL, HFILL }},
 612
 613                 { &hf_rx_serial, {
 614                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 615                         NULL, 0, NULL, HFILL }},
 616
 617                 { &hf_rx_type, {
 618                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 619                         VALS(rx_types), 0, NULL, HFILL }},
 620
 621                 { &hf_rx_flags, {
 622                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 623                         NULL, 0, NULL, HFILL }},
 624
 625                 { &hf_rx_flags_clientinit, {
 626                         "Client Initiated", "rx.flags.client_init", FT_BOOLEAN, 8,
 627                         NULL, RX_CLIENT_INITIATED, NULL, HFILL }},
 628
 629                 { &hf_rx_flags_request_ack, {
 630                         "Request Ack", "rx.flags.request_ack", FT_BOOLEAN, 8,
 631                         NULL, RX_REQUEST_ACK, NULL, HFILL }},
 632
 633                 { &hf_rx_flags_last_packet, {
 634                         "Last Packet", "rx.flags.last_packet", FT_BOOLEAN, 8,
 635                         NULL, RX_LAST_PACKET, NULL, HFILL }},
 636
 637                 { &hf_rx_flags_more_packets, {
 638                         "More Packets", "rx.flags.more_packets", FT_BOOLEAN, 8,
 639                         NULL, RX_MORE_PACKETS, NULL, HFILL }},
 640
 641                 { &hf_rx_flags_free_packet, {
 642                         "Free Packet", "rx.flags.free_packet", FT_BOOLEAN, 8,
 643                         NULL, RX_FREE_PACKET, NULL, HFILL }},
 644
 645                 /* XXX - what about RX_SLOW_START_OR_JUMBO? */
 646
 647                 { &hf_rx_userstatus, {
 648                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 649                         NULL, 0, NULL, HFILL }},
 650
 651                 { &hf_rx_securityindex, {
 652                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 653                         NULL, 0, NULL, HFILL }},
 654
 655                 { &hf_rx_spare, {
 656                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 657                         NULL, 0, NULL, HFILL }},
 658
 659                 { &hf_rx_serviceid, {
 660                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 661                         NULL, 0, NULL, HFILL }},
 662
 663                 { &hf_rx_bufferspace, {
 664                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 665                         NULL, 0, "Number Of Packets Available", HFILL }},
 666
 667                 { &hf_rx_maxskew, {
 668                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 669                         NULL, 0, NULL, HFILL }},
 670
 671                 { &hf_rx_first_packet, {
 672                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 673                         NULL, 0, NULL, HFILL }},
 674
 675                 { &hf_rx_prev_packet, {
 676                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 677                         NULL, 0, "Previous Packet", HFILL }},
 678
 679                 { &hf_rx_reason, {
 680                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 681                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 682
 683                 { &hf_rx_numacks, {
 684                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 685                         NULL, 0, "Number Of ACKs", HFILL }},
 686
 687                 { &hf_rx_ack_type, {
 688                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 689                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 690
 691                 { &hf_rx_ack, {
 692                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 693                         NULL, 0, NULL, HFILL }},
 694
 695                 { &hf_rx_challenge, {
 696                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 697                         NULL, 0, NULL, HFILL }},
 698
 699                 { &hf_rx_version, {
 700                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 701                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 702
 703                 { &hf_rx_nonce, {
 704                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 705                         NULL, 0, NULL, HFILL }},
 706
 707                 { &hf_rx_inc_nonce, {
 708                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 709                         NULL, 0, "Incremented Nonce", HFILL }},
 710
 711                 { &hf_rx_min_level, {
 712                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 713                         NULL, 0, NULL, HFILL }},
 714
 715                 { &hf_rx_level, {
 716                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 717                         NULL, 0, NULL, HFILL }},
 718
 719                 { &hf_rx_response, {
 720                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 721                         NULL, 0, NULL, HFILL }},
 722
 723                 { &hf_rx_abort, {
 724                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 725                         NULL, 0, NULL, HFILL }},
 726
 727                 { &hf_rx_encrypted, {
 728                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 729                         NULL, 0, "Encrypted part of response packet", HFILL }},
 730
 731                 { &hf_rx_kvno, {
 732                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 733                         NULL, 0, NULL, HFILL }},
 734
 735                 { &hf_rx_ticket_len, {
 736                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 737                         NULL, 0, "Ticket Length", HFILL }},
 738
 739                 { &hf_rx_ticket, {
 740                         "ticket", "rx.ticket", FT_BYTES, BASE_NONE,
 741                         NULL, 0, NULL, HFILL }},
 742
 743                 { &hf_rx_ifmtu, {
 744                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 745                         NULL, 0, NULL, HFILL }},
 746
 747                 { &hf_rx_maxmtu, {
 748                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 749                         NULL, 0, NULL, HFILL }},
 750
 751                 { &hf_rx_rwind, {
 752                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 753                         NULL, 0, NULL, HFILL }},
 754
 755                 { &hf_rx_maxpackets, {
 756                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 757                         NULL, 0, NULL, HFILL }},
 758
 759                 { &hf_rx_abortcode, {
 760                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 761                         NULL, 0, NULL, HFILL }},
 762
 763         };
 764         static gint *ett[] = {
 765                 &ett_rx,
 766                 &ett_rx_flags,
 767                 &ett_rx_ack,
 768                 &ett_rx_challenge,
 769                 &ett_rx_response,
 770                 &ett_rx_encrypted,
 771                 &ett_rx_abort
 772         };
 773
 774         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 775         proto_register_field_array(proto_rx, hf, array_length(hf));
 776         proto_register_subtree_array(ett, array_length(ett));
 777 }
 778
 779 void
 780 proto_reg_handoff_rx(void)
 781 {
 782         dissector_handle_t rx_handle;
 783
 784         int port;
 785
 786         /*
 787          * Get handle for the AFS dissector.
 788          */
 789         afs_handle = find_dissector("afs");
 790
 791         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 792            are all used for various AFS services. */
 793         rx_handle = new_create_dissector_handle(dissect_rx, proto_rx);
 794         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 795                 dissector_add("udp.port", port, rx_handle);
 796         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 797 }