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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  28  */
  29
  30 #include "config.h"
  31
  32 #include <glib.h>
  33 #include <epan/packet.h>
  34 #include "packet-rx.h"
  35 #include <epan/addr_resolv.h>
  36
  37 /*
  38  * See
  39  *
  40  *      http://web.mit.edu/kolya/afs/rx/rx-spec
  41  *
  42  * XXX - is the "Epoch" really a UN*X time?  The high-order bit, according
  43  * to that spec, is a flag bit.
  44  */
  45
  46 #define UDP_PORT_RX_LOW         7000
  47 #define UDP_PORT_RX_HIGH        7009
  48 #define UDP_PORT_RX_AFS_BACKUPS 7021
  49
  50 static const value_string rx_types[] = {
  51         { RX_PACKET_TYPE_DATA,          "data" },
  52         { RX_PACKET_TYPE_ACK,           "ack" },
  53         { RX_PACKET_TYPE_BUSY,          "busy" },
  54         { RX_PACKET_TYPE_ABORT,         "abort" },
  55         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  56         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  57         { RX_PACKET_TYPE_RESPONSE,      "response" },
  58         { RX_PACKET_TYPE_DEBUG,         "debug" },
  59         { RX_PACKET_TYPE_PARAMS,        "params" },
  60         { RX_PACKET_TYPE_VERSION,       "version" },
  61         { 0,                            NULL },
  62 };
  63
  64 static const value_string rx_reason[] = {
  65         { RX_ACK_REQUESTED,             "Ack Requested"         },
  66         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  67         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  68         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  69         { RX_ACK_NOSPACE,               "No Space"              },
  70         { RX_ACK_PING,                  "Ping"                  },
  71         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  72         { RX_ACK_DELAY,                 "Delay"                 },
  73         { RX_ACK_IDLE,                  "Idle"                  },
  74         { 0,                            NULL                    }
  75 };
  76
  77 static const value_string rx_ack_type[] = {
  78         { RX_ACK_TYPE_NACK,     "NACK"  },
  79         { RX_ACK_TYPE_ACK,      "ACK"   },
  80         { 0,                    NULL    }
  81 };
  82
  83 static int proto_rx = -1;
  84 static int hf_rx_epoch = -1;
  85 static int hf_rx_cid = -1;
  86 static int hf_rx_seq = -1;
  87 static int hf_rx_serial = -1;
  88 static int hf_rx_callnumber = -1;
  89 static int hf_rx_type = -1;
  90 static int hf_rx_flags = -1;
  91 static int hf_rx_flags_clientinit = -1;
  92 static int hf_rx_flags_request_ack = -1;
  93 static int hf_rx_flags_last_packet = -1;
  94 static int hf_rx_flags_more_packets = -1;
  95 static int hf_rx_flags_free_packet = -1;
  96 static int hf_rx_userstatus = -1;
  97 static int hf_rx_securityindex = -1;
  98 static int hf_rx_spare = -1;
  99 static int hf_rx_serviceid = -1;
 100 static int hf_rx_bufferspace = -1;
 101 static int hf_rx_maxskew = -1;
 102 static int hf_rx_first_packet = -1;
 103 static int hf_rx_prev_packet = -1;
 104 static int hf_rx_reason = -1;
 105 static int hf_rx_numacks = -1;
 106 static int hf_rx_ack_type = -1;
 107 static int hf_rx_ack = -1;
 108 static int hf_rx_challenge = -1;
 109 static int hf_rx_version = -1;
 110 static int hf_rx_nonce = -1;
 111 static int hf_rx_inc_nonce = -1;
 112 static int hf_rx_min_level = -1;
 113 static int hf_rx_level = -1;
 114 static int hf_rx_response = -1;
 115 static int hf_rx_encrypted = -1;
 116 static int hf_rx_kvno = -1;
 117 static int hf_rx_ticket_len = -1;
 118 static int hf_rx_ticket = -1;
 119 static int hf_rx_ifmtu = -1;
 120 static int hf_rx_maxmtu = -1;
 121 static int hf_rx_rwind = -1;
 122 static int hf_rx_maxpackets = -1;
 123 static int hf_rx_abort = -1;
 124 static int hf_rx_abortcode = -1;
 125
 126 static gint ett_rx = -1;
 127 static gint ett_rx_flags = -1;
 128 static gint ett_rx_ack = -1;
 129 static gint ett_rx_challenge = -1;
 130 static gint ett_rx_response = -1;
 131 static gint ett_rx_encrypted = -1;
 132 static gint ett_rx_abort = -1;
 133
 134 static dissector_handle_t afs_handle;
 135
 136 static int
 137 dissect_rx_response_encrypted(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 138 {
 139         proto_tree *tree;
 140         proto_item *item;
 141         int old_offset=offset;
 142         int i;
 143         guint32 callnumber;
 144
 145         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, ENC_NA);
 146         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 147
 148         /* epoch : 4 bytes */
 149         {
 150                 nstime_t ts;
 151                 ts.secs = tvb_get_ntohl(tvb, offset);
 152                 ts.nsecs = 0;
 153
 154                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 155                         offset, 4, &ts);
 156                 offset += 4;
 157         }
 158
 159         /* cid : 4 bytes */
 160         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, ENC_BIG_ENDIAN);
 161         offset += 4;
 162
 163         /*FIXME dont know how to handle this checksum, skipping it */
 164         offset += 4;
 165
 166         /* sequrityindex : 1 byte */
 167         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, ENC_BIG_ENDIAN);
 168         offset += 4;
 169
 170         for (i=0; i<RX_MAXCALLS; i++) {
 171                 /* callnumber : 4 bytes */
 172                 callnumber = tvb_get_ntohl(tvb, offset);
 173                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 174                         offset, 4, callnumber);
 175                 offset += 4;
 176         }
 177
 178         /* inc nonce : 4 bytes */
 179         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, ENC_BIG_ENDIAN);
 180         offset += 4;
 181
 182         /* level : 4 bytes */
 183         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, ENC_BIG_ENDIAN);
 184         offset += 4;
 185
 186         proto_item_set_len(item, offset-old_offset);
 187         return offset;
 188 }
 189
 190
 191 static int
 192 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 193 {
 194         proto_tree *tree;
 195         proto_item *item;
 196         guint32 version, tl;
 197         int old_offset=offset;
 198
 199         col_add_fstr(pinfo->cinfo, COL_INFO,
 200                         "RESPONSE  "
 201                         "Seq: %lu  "
 202                         "Call: %lu  "
 203                         "Source Port: %s  "
 204                         "Destination Port: %s  ",
 205                         (unsigned long)seq,
 206                         (unsigned long)callnumber,
 207                         get_udp_port(pinfo->srcport),
 208                         get_udp_port(pinfo->destport)
 209                 );
 210
 211         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, ENC_NA);
 212         tree = proto_item_add_subtree(item, ett_rx_response);
 213
 214         version = tvb_get_ntohl(tvb, offset);
 215         proto_tree_add_uint(tree, hf_rx_version, tvb,
 216                 offset, 4, version);
 217         offset += 4;
 218
 219         if (version==2) {
 220                 /* skip unused */
 221                 offset += 4;
 222
 223                 /* encrypted : struct */
 224                 offset = dissect_rx_response_encrypted(tvb, tree, offset);
 225
 226                 /* kvno */
 227                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, ENC_BIG_ENDIAN);
 228                 offset += 4;
 229
 230                 /* ticket_len */
 231                 tl = tvb_get_ntohl(tvb, offset);
 232                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 233                         offset, 4, tl);
 234                 offset += 4;
 235
 236                 tvb_ensure_bytes_exist(tvb, offset, tl);
 237                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, ENC_NA);
 238                 offset += tl;
 239         }
 240
 241         proto_item_set_len(item, offset-old_offset);
 242         return offset;
 243 }
 244
 245 static int
 246 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 247 {
 248         proto_tree *tree;
 249         proto_item *item;
 250         int old_offset=offset;
 251
 252         col_add_fstr(pinfo->cinfo, COL_INFO,
 253                         "ABORT  "
 254                         "Seq: %lu  "
 255                         "Call: %lu  "
 256                         "Source Port: %s  "
 257                         "Destination Port: %s  ",
 258                         (unsigned long)seq,
 259                         (unsigned long)callnumber,
 260                         get_udp_port(pinfo->srcport),
 261                         get_udp_port(pinfo->destport)
 262                 );
 263
 264         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, ENC_NA);
 265         tree = proto_item_add_subtree(item, ett_rx_abort);
 266
 267         /* kvno */
 268         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, ENC_BIG_ENDIAN);
 269         offset += 4;
 270
 271         proto_item_set_len(item, offset-old_offset);
 272         return offset;
 273 }
 274
 275
 276 static int
 277 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 278 {
 279         proto_tree *tree;
 280         proto_item *item;
 281         guint32 version;
 282         int old_offset=offset;
 283
 284         col_add_fstr(pinfo->cinfo, COL_INFO,
 285                         "CHALLENGE  "
 286                         "Seq: %lu  "
 287                         "Call: %lu  "
 288                         "Source Port: %s  "
 289                         "Destination Port: %s  ",
 290                         (unsigned long)seq,
 291                         (unsigned long)callnumber,
 292                         get_udp_port(pinfo->srcport),
 293                         get_udp_port(pinfo->destport)
 294                 );
 295
 296         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, ENC_NA);
 297         tree = proto_item_add_subtree(item, ett_rx_challenge);
 298
 299         version = tvb_get_ntohl(tvb, offset);
 300         proto_tree_add_uint(tree, hf_rx_version, tvb,
 301                 offset, 4, version);
 302         offset += 4;
 303
 304         if (version==2) {
 305                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, ENC_BIG_ENDIAN);
 306                 offset += 4;
 307
 308                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, ENC_BIG_ENDIAN);
 309                 offset += 4;
 310         }
 311
 312         proto_item_set_len(item, offset-old_offset);
 313         return offset;
 314 }
 315
 316 static int
 317 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 318 {
 319         proto_tree *tree;
 320         proto_item *item;
 321         guint8 num;
 322         int old_offset = offset;
 323
 324         col_add_fstr(pinfo->cinfo, COL_INFO,
 325                         "ACK  "
 326                         "Seq: %lu  "
 327                         "Call: %lu  "
 328                         "Source Port: %s  "
 329                         "Destination Port: %s  ",
 330                         (unsigned long)seq,
 331                         (unsigned long)callnumber,
 332                         get_udp_port(pinfo->srcport),
 333                         get_udp_port(pinfo->destport)
 334                 );
 335
 336         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, ENC_NA);
 337         tree = proto_item_add_subtree(item, ett_rx_ack);
 338
 339
 340         /* bufferspace: 2 bytes*/
 341         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, ENC_BIG_ENDIAN);
 342         offset += 2;
 343
 344         /* maxskew: 2 bytes*/
 345         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, ENC_BIG_ENDIAN);
 346         offset += 2;
 347
 348         /* first packet: 4 bytes*/
 349         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, ENC_BIG_ENDIAN);
 350         offset += 4;
 351
 352         /* prev packet: 4 bytes*/
 353         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, ENC_BIG_ENDIAN);
 354         offset += 4;
 355
 356         /* serial : 4 bytes */
 357         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, ENC_BIG_ENDIAN);
 358         offset += 4;
 359
 360         /* reason : 1 byte */
 361         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
 362         offset += 1;
 363
 364         /* nACKs */
 365         num = tvb_get_guint8(tvb, offset);
 366         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 367         offset += 1;
 368
 369         while(num--){
 370                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 371                         ENC_BIG_ENDIAN);
 372                 offset += 1;
 373         }
 374
 375         /* Some implementations adds some extra fields.
 376          * As far as I can see, these first add 3 padding bytes and then
 377          * up to 4 32-bit values. (0,3,4 have been witnessed)
 378          *
 379          * RX as a protocol seems to be completely nondefined and seems to lack
 380          * any sort of documentation other than "read the source of any of the
 381          * (compatible?) implementations.
 382          */
 383         if (tvb_length_remaining(tvb, offset)>3) {
 384                 offset += 3;    /* guess. some implementations adds 3 bytes */
 385
 386                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 387                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 388                                 ENC_BIG_ENDIAN);
 389                         offset += 4;
 390                 }
 391                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 392                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 393                                 ENC_BIG_ENDIAN);
 394                         offset += 4;
 395                 }
 396                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 397                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 398                                 ENC_BIG_ENDIAN);
 399                         offset += 4;
 400                 }
 401                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 402                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 403                                 ENC_BIG_ENDIAN);
 404                         offset += 4;
 405                 }
 406         }
 407
 408         proto_item_set_len(item, offset-old_offset);
 409         return offset;
 410 }
 411
 412
 413 static int
 414 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 415 {
 416         proto_tree *tree;
 417         proto_item *item;
 418         guint8 flags;
 419
 420         flags = tvb_get_guint8(tvb, offset);
 421         rxinfo->flags = flags;
 422
 423         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 424                 offset, 1, flags);
 425         tree = proto_item_add_subtree(item, ett_rx_flags);
 426
 427         proto_tree_add_boolean(tree, hf_rx_flags_free_packet, tvb,
 428                 offset, 1, flags);
 429         proto_tree_add_boolean(tree, hf_rx_flags_more_packets, tvb,
 430                 offset, 1, flags);
 431         proto_tree_add_boolean(tree, hf_rx_flags_last_packet, tvb,
 432                 offset, 1, flags);
 433         proto_tree_add_boolean(tree, hf_rx_flags_request_ack, tvb,
 434                 offset, 1, flags);
 435         proto_tree_add_boolean(tree, hf_rx_flags_clientinit, tvb,
 436                 offset, 1, flags);
 437
 438         offset += 1;
 439         return offset;
 440 }
 441
 442 static int
 443 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
 444 {
 445         proto_tree *tree;
 446         proto_item *item;
 447         int offset = 0;
 448         struct rxinfo rxinfo;
 449         guint8 type;
 450         nstime_t ts;
 451         guint32 seq, callnumber;
 452         guint16 serviceid;
 453
 454         /* Ensure we have enough data */
 455         if (tvb_length(tvb) < 28)
 456                 return 0;
 457
 458         /* Make sure it's a known type */
 459         type = tvb_get_guint8(tvb, 20);
 460         if (type == 0 || type == 10 || type == 11 || type == 12 || type > 13)
 461                 return 0;
 462
 463         col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 464         col_clear(pinfo->cinfo, COL_INFO);
 465
 466         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 467                 offset, 28, "RX Protocol");
 468         tree = proto_item_add_subtree(item, ett_rx);
 469
 470         /* epoch : 4 bytes */
 471         rxinfo.epoch = tvb_get_ntohl(tvb, offset);
 472         ts.secs = rxinfo.epoch;
 473         ts.nsecs = 0;
 474         proto_tree_add_time(tree, hf_rx_epoch, tvb, offset, 4, &ts);
 475         offset += 4;
 476
 477         /* cid : 4 bytes */
 478         rxinfo.cid = tvb_get_ntohl(tvb, offset);
 479         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, ENC_BIG_ENDIAN);
 480         offset += 4;
 481
 482         /* callnumber : 4 bytes */
 483         callnumber = tvb_get_ntohl(tvb, offset);
 484         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 485                 offset, 4, callnumber);
 486         offset += 4;
 487         rxinfo.callnumber = callnumber;
 488
 489         /* seq : 4 bytes */
 490         seq = tvb_get_ntohl(tvb, offset);
 491         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 492                 offset, 4, seq);
 493         offset += 4;
 494         rxinfo.seq = seq;
 495
 496         /* serial : 4 bytes */
 497         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, ENC_BIG_ENDIAN);
 498         offset += 4;
 499
 500         /* type : 1 byte */
 501         type = tvb_get_guint8(tvb, offset);
 502         proto_tree_add_uint(tree, hf_rx_type, tvb,
 503                 offset, 1, type);
 504         offset += 1;
 505         rxinfo.type = type;
 506
 507         /* flags : 1 byte */
 508         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 509
 510         /* userstatus : 1 byte */
 511         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, ENC_BIG_ENDIAN);
 512         offset += 1;
 513
 514         /* sequrityindex : 1 byte */
 515         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, ENC_BIG_ENDIAN);
 516         offset += 1;
 517
 518         /*
 519          * How clever: even though the AFS header files indicate that the
 520          * serviceId is first, it's really encoded _after_ the spare field.
 521          * I wasted a day figuring that out!
 522          */
 523
 524         /* spare */
 525         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, ENC_BIG_ENDIAN);
 526         offset += 2;
 527
 528         /* service id : 2 bytes */
 529         serviceid = tvb_get_ntohs(tvb, offset);
 530         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 531                 offset, 2, serviceid);
 532         offset += 2;
 533         rxinfo.serviceid = serviceid;
 534
 535         switch (type) {
 536         case RX_PACKET_TYPE_ACK:
 537                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 538                         cant create it in a parallell tree, then ett seasrch
 539                         wont work */
 540                 dissect_rx_acks(tvb, pinfo, tree, offset,
 541                         seq, callnumber);
 542                 break;
 543         case RX_PACKET_TYPE_ACKALL:
 544                 /* does not contain any payload */
 545                 col_add_fstr(pinfo->cinfo, COL_INFO,
 546                                 "ACKALL  "
 547                                 "Seq: %lu  "
 548                                 "Call: %lu  "
 549                                 "Source Port: %s  "
 550                                 "Destination Port: %s  ",
 551                                 (unsigned long)seq,
 552                                 (unsigned long)callnumber,
 553                                 get_udp_port(pinfo->srcport),
 554                                 get_udp_port(pinfo->destport)
 555                         );
 556                 break;
 557         case RX_PACKET_TYPE_CHALLENGE:
 558                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 559                 break;
 560         case RX_PACKET_TYPE_RESPONSE:
 561                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 562                 break;
 563         case RX_PACKET_TYPE_DATA: {
 564                 tvbuff_t *next_tvb;
 565
 566                 next_tvb = tvb_new_subset_remaining(tvb, offset);
 567                 call_dissector_with_data(afs_handle, next_tvb, pinfo, parent_tree, &rxinfo);
 568                 };
 569                 break;
 570         case RX_PACKET_TYPE_ABORT:
 571                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 572                 break;
 573         }
 574
 575         return(tvb_length(tvb));
 576 }
 577
 578 void
 579 proto_register_rx(void)
 580 {
 581         static hf_register_info hf[] = {
 582                 { &hf_rx_epoch, {
 583                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
 584                         NULL, 0, NULL, HFILL }},
 585
 586                 { &hf_rx_cid, {
 587                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 588                         NULL, 0, NULL, HFILL }},
 589
 590                 { &hf_rx_callnumber, {
 591                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 592                         NULL, 0, NULL, HFILL }},
 593
 594                 { &hf_rx_seq, {
 595                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 596                         NULL, 0, NULL, HFILL }},
 597
 598                 { &hf_rx_serial, {
 599                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 600                         NULL, 0, NULL, HFILL }},
 601
 602                 { &hf_rx_type, {
 603                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 604                         VALS(rx_types), 0, NULL, HFILL }},
 605
 606                 { &hf_rx_flags, {
 607                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 608                         NULL, 0, NULL, HFILL }},
 609
 610                 { &hf_rx_flags_clientinit, {
 611                         "Client Initiated", "rx.flags.client_init", FT_BOOLEAN, 8,
 612                         NULL, RX_CLIENT_INITIATED, NULL, HFILL }},
 613
 614                 { &hf_rx_flags_request_ack, {
 615                         "Request Ack", "rx.flags.request_ack", FT_BOOLEAN, 8,
 616                         NULL, RX_REQUEST_ACK, NULL, HFILL }},
 617
 618                 { &hf_rx_flags_last_packet, {
 619                         "Last Packet", "rx.flags.last_packet", FT_BOOLEAN, 8,
 620                         NULL, RX_LAST_PACKET, NULL, HFILL }},
 621
 622                 { &hf_rx_flags_more_packets, {
 623                         "More Packets", "rx.flags.more_packets", FT_BOOLEAN, 8,
 624                         NULL, RX_MORE_PACKETS, NULL, HFILL }},
 625
 626                 { &hf_rx_flags_free_packet, {
 627                         "Free Packet", "rx.flags.free_packet", FT_BOOLEAN, 8,
 628                         NULL, RX_FREE_PACKET, NULL, HFILL }},
 629
 630                 /* XXX - what about RX_SLOW_START_OR_JUMBO? */
 631
 632                 { &hf_rx_userstatus, {
 633                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 634                         NULL, 0, NULL, HFILL }},
 635
 636                 { &hf_rx_securityindex, {
 637                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 638                         NULL, 0, NULL, HFILL }},
 639
 640                 { &hf_rx_spare, {
 641                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 642                         NULL, 0, NULL, HFILL }},
 643
 644                 { &hf_rx_serviceid, {
 645                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 646                         NULL, 0, NULL, HFILL }},
 647
 648                 { &hf_rx_bufferspace, {
 649                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 650                         NULL, 0, "Number Of Packets Available", HFILL }},
 651
 652                 { &hf_rx_maxskew, {
 653                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 654                         NULL, 0, NULL, HFILL }},
 655
 656                 { &hf_rx_first_packet, {
 657                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 658                         NULL, 0, NULL, HFILL }},
 659
 660                 { &hf_rx_prev_packet, {
 661                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 662                         NULL, 0, "Previous Packet", HFILL }},
 663
 664                 { &hf_rx_reason, {
 665                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 666                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 667
 668                 { &hf_rx_numacks, {
 669                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 670                         NULL, 0, "Number Of ACKs", HFILL }},
 671
 672                 { &hf_rx_ack_type, {
 673                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 674                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 675
 676                 { &hf_rx_ack, {
 677                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 678                         NULL, 0, NULL, HFILL }},
 679
 680                 { &hf_rx_challenge, {
 681                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 682                         NULL, 0, NULL, HFILL }},
 683
 684                 { &hf_rx_version, {
 685                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 686                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 687
 688                 { &hf_rx_nonce, {
 689                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 690                         NULL, 0, NULL, HFILL }},
 691
 692                 { &hf_rx_inc_nonce, {
 693                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 694                         NULL, 0, "Incremented Nonce", HFILL }},
 695
 696                 { &hf_rx_min_level, {
 697                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 698                         NULL, 0, NULL, HFILL }},
 699
 700                 { &hf_rx_level, {
 701                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 702                         NULL, 0, NULL, HFILL }},
 703
 704                 { &hf_rx_response, {
 705                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 706                         NULL, 0, NULL, HFILL }},
 707
 708                 { &hf_rx_abort, {
 709                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 710                         NULL, 0, NULL, HFILL }},
 711
 712                 { &hf_rx_encrypted, {
 713                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 714                         NULL, 0, "Encrypted part of response packet", HFILL }},
 715
 716                 { &hf_rx_kvno, {
 717                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 718                         NULL, 0, NULL, HFILL }},
 719
 720                 { &hf_rx_ticket_len, {
 721                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 722                         NULL, 0, "Ticket Length", HFILL }},
 723
 724                 { &hf_rx_ticket, {
 725                         "ticket", "rx.ticket", FT_BYTES, BASE_NONE,
 726                         NULL, 0, NULL, HFILL }},
 727
 728                 { &hf_rx_ifmtu, {
 729                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 730                         NULL, 0, NULL, HFILL }},
 731
 732                 { &hf_rx_maxmtu, {
 733                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 734                         NULL, 0, NULL, HFILL }},
 735
 736                 { &hf_rx_rwind, {
 737                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 738                         NULL, 0, NULL, HFILL }},
 739
 740                 { &hf_rx_maxpackets, {
 741                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 742                         NULL, 0, NULL, HFILL }},
 743
 744                 { &hf_rx_abortcode, {
 745                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 746                         NULL, 0, NULL, HFILL }},
 747
 748         };
 749         static gint *ett[] = {
 750                 &ett_rx,
 751                 &ett_rx_flags,
 752                 &ett_rx_ack,
 753                 &ett_rx_challenge,
 754                 &ett_rx_response,
 755                 &ett_rx_encrypted,
 756                 &ett_rx_abort
 757         };
 758
 759         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 760         proto_register_field_array(proto_rx, hf, array_length(hf));
 761         proto_register_subtree_array(ett, array_length(ett));
 762 }
 763
 764 void
 765 proto_reg_handoff_rx(void)
 766 {
 767         dissector_handle_t rx_handle;
 768
 769         int port;
 770
 771         /*
 772          * Get handle for the AFS dissector.
 773          */
 774         afs_handle = find_dissector("afs");
 775
 776         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 777            are all used for various AFS services. */
 778         rx_handle = new_create_dissector_handle(dissect_rx, proto_rx);
 779         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 780                 dissector_add_uint("udp.port", port, rx_handle);
 781         dissector_add_uint("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 782 }