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 1.38 2003/01/31 03:17:46 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 #include <string.h>
  37 #include <glib.h>
  38 #include <epan/packet.h>
  39 #include "packet-rx.h"
  40 #include <epan/resolv.h>
  41
  42 #define UDP_PORT_RX_LOW         7000
  43 #define UDP_PORT_RX_HIGH        7009
  44 #define UDP_PORT_RX_AFS_BACKUPS 7021
  45
  46 static const value_string rx_types[] = {
  47         { RX_PACKET_TYPE_DATA,          "data" },
  48         { RX_PACKET_TYPE_ACK,           "ack" },
  49         { RX_PACKET_TYPE_BUSY,          "busy" },
  50         { RX_PACKET_TYPE_ABORT,         "abort" },
  51         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  52         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  53         { RX_PACKET_TYPE_RESPONSE,      "response" },
  54         { RX_PACKET_TYPE_DEBUG,         "debug" },
  55         { RX_PACKET_TYPE_PARAMS,        "params" },
  56         { RX_PACKET_TYPE_VERSION,       "version" },
  57         { 0,                            NULL },
  58 };
  59
  60 static const value_string rx_reason[] = {
  61         { RX_ACK_REQUESTED,             "Ack Requested"         },
  62         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  63         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  64         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  65         { RX_ACK_NOSPACE,               "No Space"              },
  66         { RX_ACK_PING,                  "Ping"                  },
  67         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  68         { RX_ACK_DELAY,                 "Delay"                 },
  69         { RX_ACK_IDLE,                  "Idle"                  },
  70         { 0,                            NULL                    }
  71 };
  72
  73 static const value_string rx_ack_type[] = {
  74         { RX_ACK_TYPE_NACK,     "NACK"  },
  75         { RX_ACK_TYPE_ACK,      "ACK"   },
  76         { 0,                    NULL    }
  77 };
  78
  79 static int proto_rx = -1;
  80 static int hf_rx_epoch = -1;
  81 static int hf_rx_cid = -1;
  82 static int hf_rx_seq = -1;
  83 static int hf_rx_serial = -1;
  84 static int hf_rx_callnumber = -1;
  85 static int hf_rx_type = -1;
  86 static int hf_rx_flags = -1;
  87 static int hf_rx_flags_clientinit = -1;
  88 static int hf_rx_flags_request_ack = -1;
  89 static int hf_rx_flags_last_packet = -1;
  90 static int hf_rx_flags_more_packets = -1;
  91 static int hf_rx_flags_free_packet = -1;
  92 static int hf_rx_userstatus = -1;
  93 static int hf_rx_securityindex = -1;
  94 static int hf_rx_spare = -1;
  95 static int hf_rx_serviceid = -1;
  96 static int hf_rx_bufferspace = -1;
  97 static int hf_rx_maxskew = -1;
  98 static int hf_rx_first_packet = -1;
  99 static int hf_rx_prev_packet = -1;
 100 static int hf_rx_reason = -1;
 101 static int hf_rx_numacks = -1;
 102 static int hf_rx_ack_type = -1;
 103 static int hf_rx_ack = -1;
 104 static int hf_rx_challenge = -1;
 105 static int hf_rx_version = -1;
 106 static int hf_rx_nonce = -1;
 107 static int hf_rx_inc_nonce = -1;
 108 static int hf_rx_min_level = -1;
 109 static int hf_rx_level = -1;
 110 static int hf_rx_response = -1;
 111 static int hf_rx_encrypted = -1;
 112 static int hf_rx_kvno = -1;
 113 static int hf_rx_ticket_len = -1;
 114 static int hf_rx_ticket = -1;
 115 static int hf_rx_ifmtu = -1;
 116 static int hf_rx_maxmtu = -1;
 117 static int hf_rx_rwind = -1;
 118 static int hf_rx_maxpackets = -1;
 119 static int hf_rx_abort = -1;
 120 static int hf_rx_abortcode = -1;
 121
 122 static gint ett_rx = -1;
 123 static gint ett_rx_flags = -1;
 124 static gint ett_rx_ack = -1;
 125 static gint ett_rx_challenge = -1;
 126 static gint ett_rx_response = -1;
 127 static gint ett_rx_encrypted = -1;
 128 static gint ett_rx_abort = -1;
 129
 130 static dissector_handle_t afs_handle;
 131
 132 static int
 133 dissect_rx_response_encrypted(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 134 {
 135         proto_tree *tree;
 136         proto_item *item;
 137         int old_offset=offset;
 138         int i;
 139         guint32 callnumber;
 140
 141         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, FALSE);
 142         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 143
 144         /* epoch : 4 bytes */
 145         {
 146                 nstime_t ts;
 147                 ts.secs = tvb_get_ntohl(tvb, offset);
 148                 ts.nsecs = 0;
 149
 150                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 151                         offset, 4, &ts);
 152                 offset += 4;
 153         }
 154
 155         /* cid : 4 bytes */
 156         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 157         offset += 4;
 158
 159         /*FIXME dont know how to handle this checksum, skipping it */
 160         offset += 4;
 161
 162         /* sequrityindex : 1 byte */
 163         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 164         offset += 4;
 165
 166         for (i=0; i<RX_MAXCALLS; i++) {
 167                 /* callnumber : 4 bytes */
 168                 callnumber = tvb_get_ntohl(tvb, offset);
 169                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 170                         offset, 4, callnumber);
 171                 offset += 4;
 172         }
 173
 174         /* inc nonce : 4 bytes */
 175         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 176         offset += 4;
 177
 178         /* level : 4 bytes */
 179         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 180         offset += 4;
 181
 182         proto_item_set_len(item, offset-old_offset);
 183         return offset;
 184 }
 185
 186
 187 static int
 188 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 189 {
 190         proto_tree *tree;
 191         proto_item *item;
 192         guint32 version, tl;
 193         int old_offset=offset;
 194
 195         if (check_col(pinfo->cinfo, COL_INFO)) {
 196                 col_add_fstr(pinfo->cinfo, COL_INFO,
 197                         "RESPONSE  "
 198                         "Seq: %lu  "
 199                         "Call: %lu  "
 200                         "Source Port: %s  "
 201                         "Destination Port: %s  ",
 202                         (unsigned long)seq,
 203                         (unsigned long)callnumber,
 204                         get_udp_port(pinfo->srcport),
 205                         get_udp_port(pinfo->destport)
 206                 );
 207         }
 208
 209         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, FALSE);
 210         tree = proto_item_add_subtree(item, ett_rx_response);
 211
 212         version = tvb_get_ntohl(tvb, offset);
 213         proto_tree_add_uint(tree, hf_rx_version, tvb,
 214                 offset, 4, version);
 215         offset += 4;
 216
 217         if (version==2) {
 218                 /* skip unused */
 219                 offset += 4;
 220
 221                 /* encrypted : struct */
 222                 offset = dissect_rx_response_encrypted(tvb, tree, offset);
 223
 224                 /* kvno */
 225                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 226                 offset += 4;
 227
 228                 /* ticket_len */
 229                 tl = tvb_get_ntohl(tvb, offset);
 230                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 231                         offset, 4, tl);
 232                 offset += 4;
 233
 234                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 235                 offset += tl;
 236         }
 237
 238         proto_item_set_len(item, offset-old_offset);
 239         return offset;
 240 }
 241
 242 static int
 243 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 244 {
 245         proto_tree *tree;
 246         proto_item *item;
 247         int old_offset=offset;
 248
 249         if (check_col(pinfo->cinfo, COL_INFO)) {
 250                 col_add_fstr(pinfo->cinfo, COL_INFO,
 251                         "ABORT  "
 252                         "Seq: %lu  "
 253                         "Call: %lu  "
 254                         "Source Port: %s  "
 255                         "Destination Port: %s  ",
 256                         (unsigned long)seq,
 257                         (unsigned long)callnumber,
 258                         get_udp_port(pinfo->srcport),
 259                         get_udp_port(pinfo->destport)
 260                 );
 261         }
 262
 263         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, FALSE);
 264         tree = proto_item_add_subtree(item, ett_rx_abort);
 265
 266         /* kvno */
 267         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, FALSE);
 268         offset += 4;
 269
 270         proto_item_set_len(item, offset-old_offset);
 271         return offset;
 272 }
 273
 274
 275 static int
 276 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 277 {
 278         proto_tree *tree;
 279         proto_item *item;
 280         guint32 version;
 281         int old_offset=offset;
 282
 283         if (check_col(pinfo->cinfo, COL_INFO)) {
 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
 297         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, FALSE);
 298         tree = proto_item_add_subtree(item, ett_rx_challenge);
 299
 300         version = tvb_get_ntohl(tvb, offset);
 301         proto_tree_add_uint(tree, hf_rx_version, tvb,
 302                 offset, 4, version);
 303         offset += 4;
 304
 305         if (version==2) {
 306                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 307                 offset += 4;
 308
 309                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 310                 offset += 4;
 311         }
 312
 313         proto_item_set_len(item, offset-old_offset);
 314         return offset;
 315 }
 316
 317 static int
 318 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 319 {
 320         proto_tree *tree;
 321         proto_item *item;
 322         guint8 num;
 323         int old_offset = offset;
 324
 325         if (check_col(pinfo->cinfo, COL_INFO)) {
 326                 col_add_fstr(pinfo->cinfo, COL_INFO,
 327                         "ACK  "
 328                         "Seq: %lu  "
 329                         "Call: %lu  "
 330                         "Source Port: %s  "
 331                         "Destination Port: %s  ",
 332                         (unsigned long)seq,
 333                         (unsigned long)callnumber,
 334                         get_udp_port(pinfo->srcport),
 335                         get_udp_port(pinfo->destport)
 336                 );
 337         }
 338
 339         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, FALSE);
 340         tree = proto_item_add_subtree(item, ett_rx_ack);
 341
 342
 343         /* bufferspace: 2 bytes*/
 344         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 345         offset += 2;
 346
 347         /* maxskew: 2 bytes*/
 348         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 349         offset += 2;
 350
 351         /* first packet: 4 bytes*/
 352         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 353         offset += 4;
 354
 355         /* prev packet: 4 bytes*/
 356         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 357         offset += 4;
 358
 359         /* serial : 4 bytes */
 360         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 361         offset += 4;
 362
 363         /* reason : 1 byte */
 364         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 365         offset += 1;
 366
 367         /* nACKs */
 368         num = tvb_get_guint8(tvb, offset);
 369         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 370         offset += 1;
 371
 372         while(num--){
 373                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 374                         FALSE);
 375                 offset += 1;
 376         }
 377
 378         /* Some implementations adds some extra fields.
 379          * As far as I can see, these first add 3 padding bytes and then
 380          * up to 4 32-bit values. (0,3,4 have been witnessed)
 381          *
 382          * RX as a protocol seems to be completely nondefined and seems to lack
 383          * any sort of documentation other than "read the source of any of the
 384          * (compatible?) implementations.
 385          */
 386         if (tvb_length_remaining(tvb, offset)>3) {
 387                 offset += 3;    /* guess. some implementations adds 3 bytes */
 388
 389                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 390                         proto_tree_add_item(tree, hf_rx_ifmtu, tvb, offset, 4,
 391                                 FALSE);
 392                         offset += 4;
 393                 }
 394                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 395                         proto_tree_add_item(tree, hf_rx_maxmtu, tvb, offset, 4,
 396                                 FALSE);
 397                         offset += 4;
 398                 }
 399                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 400                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 401                                 FALSE);
 402                         offset += 4;
 403                 }
 404                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 405                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 406                                 FALSE);
 407                         offset += 4;
 408                 }
 409         }
 410
 411         proto_item_set_len(item, offset-old_offset);
 412         return offset;
 413 }
 414
 415
 416 static int
 417 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 418 {
 419         proto_tree *tree;
 420         proto_item *item;
 421         guint8 flags;
 422
 423         flags = tvb_get_guint8(tvb, offset);
 424         rxinfo->flags = flags;
 425
 426         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 427                 offset, 1, flags);
 428         tree = proto_item_add_subtree(item, ett_rx_flags);
 429
 430         proto_tree_add_boolean(tree, hf_rx_flags_free_packet, tvb,
 431                 offset, 1, flags);
 432         proto_tree_add_boolean(tree, hf_rx_flags_more_packets, tvb,
 433                 offset, 1, flags);
 434         proto_tree_add_boolean(tree, hf_rx_flags_last_packet, tvb,
 435                 offset, 1, flags);
 436         proto_tree_add_boolean(tree, hf_rx_flags_request_ack, tvb,
 437                 offset, 1, flags);
 438         proto_tree_add_boolean(tree, hf_rx_flags_clientinit, tvb,
 439                 offset, 1, flags);
 440
 441         offset += 1;
 442         return offset;
 443 }
 444
 445 static void
 446 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 447 {
 448         proto_tree *tree;
 449         proto_item *item;
 450         int offset = 0;
 451         struct rxinfo rxinfo;
 452         guint8 type;
 453         guint32 seq, callnumber;
 454         guint16 serviceid;
 455
 456         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 457                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 458         if (check_col(pinfo->cinfo, COL_INFO))
 459                 col_clear(pinfo->cinfo, COL_INFO);
 460
 461         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 462                 offset, 28, "RX Protocol");
 463         tree = proto_item_add_subtree(item, ett_rx);
 464
 465         /* epoch : 4 bytes */
 466         {
 467                 nstime_t ts;;
 468                 ts.secs = tvb_get_ntohl(tvb, offset);
 469                 ts.nsecs = 0;
 470
 471                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 472                         offset, 4, &ts);
 473                 offset += 4;
 474         }
 475
 476         /* cid : 4 bytes */
 477         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 478         offset += 4;
 479
 480         /* callnumber : 4 bytes */
 481         callnumber = tvb_get_ntohl(tvb, offset);
 482         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 483                 offset, 4, callnumber);
 484         offset += 4;
 485         rxinfo.callnumber = callnumber;
 486
 487         /* seq : 4 bytes */
 488         seq = tvb_get_ntohl(tvb, offset);
 489         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 490                 offset, 4, seq);
 491         offset += 4;
 492         rxinfo.seq = seq;
 493
 494         /* serial : 4 bytes */
 495         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 496         offset += 4;
 497
 498         /* type : 1 byte */
 499         type = tvb_get_guint8(tvb, offset);
 500         proto_tree_add_uint(tree, hf_rx_type, tvb,
 501                 offset, 1, type);
 502         offset += 1;
 503         rxinfo.type = type;
 504
 505         /* flags : 1 byte */
 506         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 507
 508         /* userstatus : 1 byte */
 509         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 510         offset += 1;
 511
 512         /* sequrityindex : 1 byte */
 513         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 514         offset += 1;
 515
 516         /*
 517          * How clever: even though the AFS header files indicate that the
 518          * serviceId is first, it's really encoded _after_ the spare field.
 519          * I wasted a day figuring that out!
 520          */
 521
 522         /* spare */
 523         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 524         offset += 2;
 525
 526         /* service id : 2 bytes */
 527         serviceid = tvb_get_ntohs(tvb, offset);
 528         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 529                 offset, 2, serviceid);
 530         offset += 2;
 531         rxinfo.serviceid = serviceid;
 532
 533         switch (type) {
 534         case RX_PACKET_TYPE_ACK:
 535                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 536                         cant create it in a parallell tree, then ett seasrch
 537                         wont work */
 538                 dissect_rx_acks(tvb, pinfo, tree, offset,
 539                         seq, callnumber);
 540                 break;
 541         case RX_PACKET_TYPE_ACKALL:
 542                 /* does not contain any payload */
 543                 if (check_col(pinfo->cinfo, COL_INFO)) {
 544                         col_add_fstr(pinfo->cinfo, COL_INFO,
 545                                 "ACKALL  "
 546                                 "Seq: %lu  "
 547                                 "Call: %lu  "
 548                                 "Source Port: %s  "
 549                                 "Destination Port: %s  ",
 550                                 (unsigned long)seq,
 551                                 (unsigned long)callnumber,
 552                                 get_udp_port(pinfo->srcport),
 553                                 get_udp_port(pinfo->destport)
 554                         );
 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                 pinfo->private_data = &rxinfo;
 566                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 567                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 568                 };
 569                 break;
 570         case RX_PACKET_TYPE_ABORT:
 571                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 572                 break;
 573         }
 574
 575 }
 576
 577 void
 578 proto_register_rx(void)
 579 {
 580         static hf_register_info hf[] = {
 581                 { &hf_rx_epoch, {
 582                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_DEC,
 583                         NULL, 0, "Epoch", HFILL }},
 584
 585                 { &hf_rx_cid, {
 586                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 587                         NULL, 0, "CID", HFILL }},
 588
 589                 { &hf_rx_callnumber, {
 590                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 591                         NULL, 0, "Call Number", HFILL }},
 592
 593                 { &hf_rx_seq, {
 594                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 595                         NULL, 0, "Sequence Number", HFILL }},
 596
 597                 { &hf_rx_serial, {
 598                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 599                         NULL, 0, "Serial", HFILL }},
 600
 601                 { &hf_rx_type, {
 602                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 603                         VALS(rx_types), 0, "Type", HFILL }},
 604
 605                 { &hf_rx_flags, {
 606                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 607                         NULL, 0, "Flags", HFILL }},
 608
 609                 { &hf_rx_flags_clientinit, {
 610                         "Client Initiated", "rx.flags.client_init", FT_BOOLEAN, 8,
 611                         NULL, RX_CLIENT_INITIATED, "Client Initiated", HFILL }},
 612
 613                 { &hf_rx_flags_request_ack, {
 614                         "Request Ack", "rx.flags.request_ack", FT_BOOLEAN, 8,
 615                         NULL, RX_REQUEST_ACK, "Request Ack", HFILL }},
 616
 617                 { &hf_rx_flags_last_packet, {
 618                         "Last Packet", "rx.flags.last_packet", FT_BOOLEAN, 8,
 619                         NULL, RX_LAST_PACKET, "Last Packet", HFILL }},
 620
 621                 { &hf_rx_flags_more_packets, {
 622                         "More Packets", "rx.flags.more_packets", FT_BOOLEAN, 8,
 623                         NULL, RX_MORE_PACKETS, "More Packets", HFILL }},
 624
 625                 { &hf_rx_flags_free_packet, {
 626                         "Free Packet", "rx.flags.free_packet", FT_BOOLEAN, 8,
 627                         NULL, RX_FREE_PACKET, "Free Packet", HFILL }},
 628
 629                 /* XXX - what about RX_SLOW_START_OR_JUMBO? */
 630
 631                 { &hf_rx_userstatus, {
 632                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 633                         NULL, 0, "User Status", HFILL }},
 634
 635                 { &hf_rx_securityindex, {
 636                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 637                         NULL, 0, "Security Index", HFILL }},
 638
 639                 { &hf_rx_spare, {
 640                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 641                         NULL, 0, "Spare/Checksum", HFILL }},
 642
 643                 { &hf_rx_serviceid, {
 644                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 645                         NULL, 0, "Service ID", HFILL }},
 646
 647                 { &hf_rx_bufferspace, {
 648                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 649                         NULL, 0, "Number Of Packets Available", HFILL }},
 650
 651                 { &hf_rx_maxskew, {
 652                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 653                         NULL, 0, "Max Skew", HFILL }},
 654
 655                 { &hf_rx_first_packet, {
 656                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 657                         NULL, 0, "First Packet", HFILL }},
 658
 659                 { &hf_rx_prev_packet, {
 660                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 661                         NULL, 0, "Previous Packet", HFILL }},
 662
 663                 { &hf_rx_reason, {
 664                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 665                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 666
 667                 { &hf_rx_numacks, {
 668                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 669                         NULL, 0, "Number Of ACKs", HFILL }},
 670
 671                 { &hf_rx_ack_type, {
 672                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 673                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 674
 675                 { &hf_rx_ack, {
 676                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 677                         NULL, 0, "ACK Packet", HFILL }},
 678
 679                 { &hf_rx_challenge, {
 680                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 681                         NULL, 0, "CHALLENGE Packet", HFILL }},
 682
 683                 { &hf_rx_version, {
 684                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 685                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 686
 687                 { &hf_rx_nonce, {
 688                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 689                         NULL, 0, "Nonce", HFILL }},
 690
 691                 { &hf_rx_inc_nonce, {
 692                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 693                         NULL, 0, "Incremented Nonce", HFILL }},
 694
 695                 { &hf_rx_min_level, {
 696                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 697                         NULL, 0, "Min Level", HFILL }},
 698
 699                 { &hf_rx_level, {
 700                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 701                         NULL, 0, "Level", HFILL }},
 702
 703                 { &hf_rx_response, {
 704                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 705                         NULL, 0, "RESPONSE Packet", HFILL }},
 706
 707                 { &hf_rx_abort, {
 708                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 709                         NULL, 0, "ABORT Packet", HFILL }},
 710
 711                 { &hf_rx_encrypted, {
 712                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 713                         NULL, 0, "Encrypted part of response packet", HFILL }},
 714
 715                 { &hf_rx_kvno, {
 716                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 717                         NULL, 0, "kvno", HFILL }},
 718
 719                 { &hf_rx_ticket_len, {
 720                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 721                         NULL, 0, "Ticket Length", HFILL }},
 722
 723                 { &hf_rx_ticket, {
 724                         "ticket", "rx.ticket", FT_BYTES, BASE_HEX,
 725                         NULL, 0, "Ticket", HFILL }},
 726
 727                 { &hf_rx_ifmtu, {
 728                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 729                         NULL, 0, "Interface MTU", HFILL }},
 730
 731                 { &hf_rx_maxmtu, {
 732                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 733                         NULL, 0, "Max MTU", HFILL }},
 734
 735                 { &hf_rx_rwind, {
 736                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 737                         NULL, 0, "rwind", HFILL }},
 738
 739                 { &hf_rx_maxpackets, {
 740                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 741                         NULL, 0, "Max Packets", HFILL }},
 742
 743                 { &hf_rx_abortcode, {
 744                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 745                         NULL, 0, "Abort Code", HFILL }},
 746
 747         };
 748         static gint *ett[] = {
 749                 &ett_rx,
 750                 &ett_rx_flags,
 751                 &ett_rx_ack,
 752                 &ett_rx_challenge,
 753                 &ett_rx_response,
 754                 &ett_rx_encrypted,
 755                 &ett_rx_abort
 756         };
 757
 758         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 759         proto_register_field_array(proto_rx, hf, array_length(hf));
 760         proto_register_subtree_array(ett, array_length(ett));
 761 }
 762
 763 void
 764 proto_reg_handoff_rx(void)
 765 {
 766         dissector_handle_t rx_handle;
 767
 768         int port;
 769
 770         /*
 771          * Get handle for the AFS dissector.
 772          */
 773         afs_handle = find_dissector("afs");
 774
 775         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 776            are all used for various AFS services. */
 777         rx_handle = create_dissector_handle(dissect_rx, proto_rx);
 778         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 779                 dissector_add("udp.port", port, rx_handle);
 780         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 781 }