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 <stdio.h>
  35
  36 #include <string.h>
  37 #include <glib.h>
  38 #include <epan/packet.h>
  39 #include "packet-rx.h"
  40 #include <epan/addr_resolv.h>
  41
  42 /*
  43  * See
  44  *
  45  *      http://web.mit.edu/kolya/afs/rx/rx-spec
  46  *
  47  * XXX - is the "Epoch" really a UN*X time?  The high-order bit, according
  48  * to that spec, is a flag bit.
  49  */
  50
  51 #define UDP_PORT_RX_LOW         7000
  52 #define UDP_PORT_RX_HIGH        7009
  53 #define UDP_PORT_RX_AFS_BACKUPS 7021
  54
  55 static const value_string rx_types[] = {
  56         { RX_PACKET_TYPE_DATA,          "data" },
  57         { RX_PACKET_TYPE_ACK,           "ack" },
  58         { RX_PACKET_TYPE_BUSY,          "busy" },
  59         { RX_PACKET_TYPE_ABORT,         "abort" },
  60         { RX_PACKET_TYPE_ACKALL,        "ackall" },
  61         { RX_PACKET_TYPE_CHALLENGE,     "challenge" },
  62         { RX_PACKET_TYPE_RESPONSE,      "response" },
  63         { RX_PACKET_TYPE_DEBUG,         "debug" },
  64         { RX_PACKET_TYPE_PARAMS,        "params" },
  65         { RX_PACKET_TYPE_VERSION,       "version" },
  66         { 0,                            NULL },
  67 };
  68
  69 static const value_string rx_reason[] = {
  70         { RX_ACK_REQUESTED,             "Ack Requested"         },
  71         { RX_ACK_DUPLICATE,             "Duplicate Packet"      },
  72         { RX_ACK_OUT_OF_SEQUENCE,       "Out Of Sequence"       },
  73         { RX_ACK_EXEEDS_WINDOW,         "Exceeds Window"        },
  74         { RX_ACK_NOSPACE,               "No Space"              },
  75         { RX_ACK_PING,                  "Ping"                  },
  76         { RX_ACK_PING_RESPONSE,         "Ping Response"         },
  77         { RX_ACK_DELAY,                 "Delay"                 },
  78         { RX_ACK_IDLE,                  "Idle"                  },
  79         { 0,                            NULL                    }
  80 };
  81
  82 static const value_string rx_ack_type[] = {
  83         { RX_ACK_TYPE_NACK,     "NACK"  },
  84         { RX_ACK_TYPE_ACK,      "ACK"   },
  85         { 0,                    NULL    }
  86 };
  87
  88 static int proto_rx = -1;
  89 static int hf_rx_epoch = -1;
  90 static int hf_rx_cid = -1;
  91 static int hf_rx_seq = -1;
  92 static int hf_rx_serial = -1;
  93 static int hf_rx_callnumber = -1;
  94 static int hf_rx_type = -1;
  95 static int hf_rx_flags = -1;
  96 static int hf_rx_flags_clientinit = -1;
  97 static int hf_rx_flags_request_ack = -1;
  98 static int hf_rx_flags_last_packet = -1;
  99 static int hf_rx_flags_more_packets = -1;
 100 static int hf_rx_flags_free_packet = -1;
 101 static int hf_rx_userstatus = -1;
 102 static int hf_rx_securityindex = -1;
 103 static int hf_rx_spare = -1;
 104 static int hf_rx_serviceid = -1;
 105 static int hf_rx_bufferspace = -1;
 106 static int hf_rx_maxskew = -1;
 107 static int hf_rx_first_packet = -1;
 108 static int hf_rx_prev_packet = -1;
 109 static int hf_rx_reason = -1;
 110 static int hf_rx_numacks = -1;
 111 static int hf_rx_ack_type = -1;
 112 static int hf_rx_ack = -1;
 113 static int hf_rx_challenge = -1;
 114 static int hf_rx_version = -1;
 115 static int hf_rx_nonce = -1;
 116 static int hf_rx_inc_nonce = -1;
 117 static int hf_rx_min_level = -1;
 118 static int hf_rx_level = -1;
 119 static int hf_rx_response = -1;
 120 static int hf_rx_encrypted = -1;
 121 static int hf_rx_kvno = -1;
 122 static int hf_rx_ticket_len = -1;
 123 static int hf_rx_ticket = -1;
 124 static int hf_rx_ifmtu = -1;
 125 static int hf_rx_maxmtu = -1;
 126 static int hf_rx_rwind = -1;
 127 static int hf_rx_maxpackets = -1;
 128 static int hf_rx_abort = -1;
 129 static int hf_rx_abortcode = -1;
 130
 131 static gint ett_rx = -1;
 132 static gint ett_rx_flags = -1;
 133 static gint ett_rx_ack = -1;
 134 static gint ett_rx_challenge = -1;
 135 static gint ett_rx_response = -1;
 136 static gint ett_rx_encrypted = -1;
 137 static gint ett_rx_abort = -1;
 138
 139 static dissector_handle_t afs_handle;
 140
 141 static int
 142 dissect_rx_response_encrypted(tvbuff_t *tvb, proto_tree *parent_tree, int offset)
 143 {
 144         proto_tree *tree;
 145         proto_item *item;
 146         int old_offset=offset;
 147         int i;
 148         guint32 callnumber;
 149
 150         item = proto_tree_add_item(parent_tree, hf_rx_encrypted, tvb, offset, -1, FALSE);
 151         tree = proto_item_add_subtree(item, ett_rx_encrypted);
 152
 153         /* epoch : 4 bytes */
 154         {
 155                 nstime_t ts;
 156                 ts.secs = tvb_get_ntohl(tvb, offset);
 157                 ts.nsecs = 0;
 158
 159                 proto_tree_add_time(tree, hf_rx_epoch, tvb,
 160                         offset, 4, &ts);
 161                 offset += 4;
 162         }
 163
 164         /* cid : 4 bytes */
 165         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 166         offset += 4;
 167
 168         /*FIXME dont know how to handle this checksum, skipping it */
 169         offset += 4;
 170
 171         /* sequrityindex : 1 byte */
 172         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 173         offset += 4;
 174
 175         for (i=0; i<RX_MAXCALLS; i++) {
 176                 /* callnumber : 4 bytes */
 177                 callnumber = tvb_get_ntohl(tvb, offset);
 178                 proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 179                         offset, 4, callnumber);
 180                 offset += 4;
 181         }
 182
 183         /* inc nonce : 4 bytes */
 184         proto_tree_add_item(tree, hf_rx_inc_nonce, tvb, offset, 4, FALSE);
 185         offset += 4;
 186
 187         /* level : 4 bytes */
 188         proto_tree_add_item(tree, hf_rx_level, tvb, offset, 4, FALSE);
 189         offset += 4;
 190
 191         proto_item_set_len(item, offset-old_offset);
 192         return offset;
 193 }
 194
 195
 196 static int
 197 dissect_rx_response(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 198 {
 199         proto_tree *tree;
 200         proto_item *item;
 201         guint32 version, tl;
 202         int old_offset=offset;
 203
 204         if (check_col(pinfo->cinfo, COL_INFO)) {
 205                 col_add_fstr(pinfo->cinfo, COL_INFO,
 206                         "RESPONSE  "
 207                         "Seq: %lu  "
 208                         "Call: %lu  "
 209                         "Source Port: %s  "
 210                         "Destination Port: %s  ",
 211                         (unsigned long)seq,
 212                         (unsigned long)callnumber,
 213                         get_udp_port(pinfo->srcport),
 214                         get_udp_port(pinfo->destport)
 215                 );
 216         }
 217
 218         item = proto_tree_add_item(parent_tree, hf_rx_response, tvb, offset, -1, FALSE);
 219         tree = proto_item_add_subtree(item, ett_rx_response);
 220
 221         version = tvb_get_ntohl(tvb, offset);
 222         proto_tree_add_uint(tree, hf_rx_version, tvb,
 223                 offset, 4, version);
 224         offset += 4;
 225
 226         if (version==2) {
 227                 /* skip unused */
 228                 offset += 4;
 229
 230                 /* encrypted : struct */
 231                 offset = dissect_rx_response_encrypted(tvb, tree, offset);
 232
 233                 /* kvno */
 234                 proto_tree_add_item(tree, hf_rx_kvno, tvb, offset, 4, FALSE);
 235                 offset += 4;
 236
 237                 /* ticket_len */
 238                 tl = tvb_get_ntohl(tvb, offset);
 239                 proto_tree_add_uint(tree, hf_rx_ticket_len, tvb,
 240                         offset, 4, tl);
 241                 offset += 4;
 242
 243                 tvb_ensure_bytes_exist(tvb, offset, tl);
 244                 proto_tree_add_item(tree, hf_rx_ticket, tvb, offset, tl, FALSE);
 245                 offset += tl;
 246         }
 247
 248         proto_item_set_len(item, offset-old_offset);
 249         return offset;
 250 }
 251
 252 static int
 253 dissect_rx_abort(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 254 {
 255         proto_tree *tree;
 256         proto_item *item;
 257         int old_offset=offset;
 258
 259         if (check_col(pinfo->cinfo, COL_INFO)) {
 260                 col_add_fstr(pinfo->cinfo, COL_INFO,
 261                         "ABORT  "
 262                         "Seq: %lu  "
 263                         "Call: %lu  "
 264                         "Source Port: %s  "
 265                         "Destination Port: %s  ",
 266                         (unsigned long)seq,
 267                         (unsigned long)callnumber,
 268                         get_udp_port(pinfo->srcport),
 269                         get_udp_port(pinfo->destport)
 270                 );
 271         }
 272
 273         item = proto_tree_add_item(parent_tree, hf_rx_abort, tvb, offset, -1, FALSE);
 274         tree = proto_item_add_subtree(item, ett_rx_abort);
 275
 276         /* kvno */
 277         proto_tree_add_item(tree, hf_rx_abortcode, tvb, offset, 4, FALSE);
 278         offset += 4;
 279
 280         proto_item_set_len(item, offset-old_offset);
 281         return offset;
 282 }
 283
 284
 285 static int
 286 dissect_rx_challenge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 287 {
 288         proto_tree *tree;
 289         proto_item *item;
 290         guint32 version;
 291         int old_offset=offset;
 292
 293         if (check_col(pinfo->cinfo, COL_INFO)) {
 294                 col_add_fstr(pinfo->cinfo, COL_INFO,
 295                         "CHALLENGE  "
 296                         "Seq: %lu  "
 297                         "Call: %lu  "
 298                         "Source Port: %s  "
 299                         "Destination Port: %s  ",
 300                         (unsigned long)seq,
 301                         (unsigned long)callnumber,
 302                         get_udp_port(pinfo->srcport),
 303                         get_udp_port(pinfo->destport)
 304                 );
 305         }
 306
 307         item = proto_tree_add_item(parent_tree, hf_rx_challenge, tvb, offset, -1, FALSE);
 308         tree = proto_item_add_subtree(item, ett_rx_challenge);
 309
 310         version = tvb_get_ntohl(tvb, offset);
 311         proto_tree_add_uint(tree, hf_rx_version, tvb,
 312                 offset, 4, version);
 313         offset += 4;
 314
 315         if (version==2) {
 316                 proto_tree_add_item(tree, hf_rx_nonce, tvb, offset, 4, FALSE);
 317                 offset += 4;
 318
 319                 proto_tree_add_item(tree, hf_rx_min_level, tvb, offset, 4, FALSE);
 320                 offset += 4;
 321         }
 322
 323         proto_item_set_len(item, offset-old_offset);
 324         return offset;
 325 }
 326
 327 static int
 328 dissect_rx_acks(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset, guint32 seq, guint32 callnumber)
 329 {
 330         proto_tree *tree;
 331         proto_item *item;
 332         guint8 num;
 333         int old_offset = offset;
 334
 335         if (check_col(pinfo->cinfo, COL_INFO)) {
 336                 col_add_fstr(pinfo->cinfo, COL_INFO,
 337                         "ACK  "
 338                         "Seq: %lu  "
 339                         "Call: %lu  "
 340                         "Source Port: %s  "
 341                         "Destination Port: %s  ",
 342                         (unsigned long)seq,
 343                         (unsigned long)callnumber,
 344                         get_udp_port(pinfo->srcport),
 345                         get_udp_port(pinfo->destport)
 346                 );
 347         }
 348
 349         item = proto_tree_add_item(parent_tree, hf_rx_ack, tvb, offset, -1, FALSE);
 350         tree = proto_item_add_subtree(item, ett_rx_ack);
 351
 352
 353         /* bufferspace: 2 bytes*/
 354         proto_tree_add_item(tree, hf_rx_bufferspace, tvb, offset, 2, FALSE);
 355         offset += 2;
 356
 357         /* maxskew: 2 bytes*/
 358         proto_tree_add_item(tree, hf_rx_maxskew, tvb, offset, 2, FALSE);
 359         offset += 2;
 360
 361         /* first packet: 4 bytes*/
 362         proto_tree_add_item(tree, hf_rx_first_packet, tvb, offset, 4, FALSE);
 363         offset += 4;
 364
 365         /* prev packet: 4 bytes*/
 366         proto_tree_add_item(tree, hf_rx_prev_packet, tvb, offset, 4, FALSE);
 367         offset += 4;
 368
 369         /* serial : 4 bytes */
 370         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 371         offset += 4;
 372
 373         /* reason : 1 byte */
 374         proto_tree_add_item(tree, hf_rx_reason, tvb, offset, 1, FALSE);
 375         offset += 1;
 376
 377         /* nACKs */
 378         num = tvb_get_guint8(tvb, offset);
 379         proto_tree_add_uint(tree, hf_rx_numacks, tvb, offset, 1, num);
 380         offset += 1;
 381
 382         while(num--){
 383                 proto_tree_add_item(tree, hf_rx_ack_type, tvb, offset, 1,
 384                         FALSE);
 385                 offset += 1;
 386         }
 387
 388         /* Some implementations adds some extra fields.
 389          * As far as I can see, these first add 3 padding bytes and then
 390          * up to 4 32-bit values. (0,3,4 have been witnessed)
 391          *
 392          * RX as a protocol seems to be completely nondefined and seems to lack
 393          * any sort of documentation other than "read the source of any of the
 394          * (compatible?) implementations.
 395          */
 396         if (tvb_length_remaining(tvb, offset)>3) {
 397                 offset += 3;    /* guess. some implementations adds 3 bytes */
 398
 399                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 400                         proto_tree_add_item(tree, hf_rx_ifmtu, 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_maxmtu, tvb, offset, 4,
 406                                 FALSE);
 407                         offset += 4;
 408                 }
 409                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 410                         proto_tree_add_item(tree, hf_rx_rwind, tvb, offset, 4,
 411                                 FALSE);
 412                         offset += 4;
 413                 }
 414                 if (tvb_reported_length_remaining(tvb, offset) >= 4){
 415                         proto_tree_add_item(tree, hf_rx_maxpackets, tvb, offset, 4,
 416                                 FALSE);
 417                         offset += 4;
 418                 }
 419         }
 420
 421         proto_item_set_len(item, offset-old_offset);
 422         return offset;
 423 }
 424
 425
 426 static int
 427 dissect_rx_flags(tvbuff_t *tvb, struct rxinfo *rxinfo, proto_tree *parent_tree, int offset)
 428 {
 429         proto_tree *tree;
 430         proto_item *item;
 431         guint8 flags;
 432
 433         flags = tvb_get_guint8(tvb, offset);
 434         rxinfo->flags = flags;
 435
 436         item = proto_tree_add_uint(parent_tree, hf_rx_flags, tvb,
 437                 offset, 1, flags);
 438         tree = proto_item_add_subtree(item, ett_rx_flags);
 439
 440         proto_tree_add_boolean(tree, hf_rx_flags_free_packet, tvb,
 441                 offset, 1, flags);
 442         proto_tree_add_boolean(tree, hf_rx_flags_more_packets, tvb,
 443                 offset, 1, flags);
 444         proto_tree_add_boolean(tree, hf_rx_flags_last_packet, tvb,
 445                 offset, 1, flags);
 446         proto_tree_add_boolean(tree, hf_rx_flags_request_ack, tvb,
 447                 offset, 1, flags);
 448         proto_tree_add_boolean(tree, hf_rx_flags_clientinit, tvb,
 449                 offset, 1, flags);
 450
 451         offset += 1;
 452         return offset;
 453 }
 454
 455 static int
 456 dissect_rx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
 457 {
 458         proto_tree *tree;
 459         proto_item *item;
 460         int offset = 0;
 461         struct rxinfo rxinfo;
 462         guint8 type;
 463         nstime_t ts;
 464         guint32 seq, callnumber;
 465         guint16 serviceid;
 466
 467         /* Ensure we have enough data */
 468         if (tvb_length(tvb) < 28)
 469                 return 0;
 470
 471         /* Make sure it's a known type */
 472         type = tvb_get_guint8(tvb, 20);
 473         if (type == 0 || type == 10 || type == 11 || type == 12 || type > 13)
 474                 return 0;
 475
 476         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 477                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RX");
 478         if (check_col(pinfo->cinfo, COL_INFO))
 479                 col_clear(pinfo->cinfo, COL_INFO);
 480
 481         item = proto_tree_add_protocol_format(parent_tree, proto_rx, tvb,
 482                 offset, 28, "RX Protocol");
 483         tree = proto_item_add_subtree(item, ett_rx);
 484
 485         /* epoch : 4 bytes */
 486         rxinfo.epoch = tvb_get_ntohl(tvb, offset);
 487         ts.secs = rxinfo.epoch;
 488         ts.nsecs = 0;
 489         proto_tree_add_time(tree, hf_rx_epoch, tvb, offset, 4, &ts);
 490         offset += 4;
 491
 492         /* cid : 4 bytes */
 493         rxinfo.cid = tvb_get_ntohl(tvb, offset);
 494         proto_tree_add_item(tree, hf_rx_cid, tvb, offset, 4, FALSE);
 495         offset += 4;
 496
 497         /* callnumber : 4 bytes */
 498         callnumber = tvb_get_ntohl(tvb, offset);
 499         proto_tree_add_uint(tree, hf_rx_callnumber, tvb,
 500                 offset, 4, callnumber);
 501         offset += 4;
 502         rxinfo.callnumber = callnumber;
 503
 504         /* seq : 4 bytes */
 505         seq = tvb_get_ntohl(tvb, offset);
 506         proto_tree_add_uint(tree, hf_rx_seq, tvb,
 507                 offset, 4, seq);
 508         offset += 4;
 509         rxinfo.seq = seq;
 510
 511         /* serial : 4 bytes */
 512         proto_tree_add_item(tree, hf_rx_serial, tvb, offset, 4, FALSE);
 513         offset += 4;
 514
 515         /* type : 1 byte */
 516         type = tvb_get_guint8(tvb, offset);
 517         proto_tree_add_uint(tree, hf_rx_type, tvb,
 518                 offset, 1, type);
 519         offset += 1;
 520         rxinfo.type = type;
 521
 522         /* flags : 1 byte */
 523         offset = dissect_rx_flags(tvb, &rxinfo, tree, offset);
 524
 525         /* userstatus : 1 byte */
 526         proto_tree_add_item(tree, hf_rx_userstatus, tvb, offset, 1, FALSE);
 527         offset += 1;
 528
 529         /* sequrityindex : 1 byte */
 530         proto_tree_add_item(tree, hf_rx_securityindex, tvb, offset, 1, FALSE);
 531         offset += 1;
 532
 533         /*
 534          * How clever: even though the AFS header files indicate that the
 535          * serviceId is first, it's really encoded _after_ the spare field.
 536          * I wasted a day figuring that out!
 537          */
 538
 539         /* spare */
 540         proto_tree_add_item(tree, hf_rx_spare, tvb, offset, 2, FALSE);
 541         offset += 2;
 542
 543         /* service id : 2 bytes */
 544         serviceid = tvb_get_ntohs(tvb, offset);
 545         proto_tree_add_uint(tree, hf_rx_serviceid, tvb,
 546                 offset, 2, serviceid);
 547         offset += 2;
 548         rxinfo.serviceid = serviceid;
 549
 550         switch (type) {
 551         case RX_PACKET_TYPE_ACK:
 552                 /*dissect_rx_acks(tvb, pinfo, parent_tree, offset,
 553                         cant create it in a parallell tree, then ett seasrch
 554                         wont work */
 555                 dissect_rx_acks(tvb, pinfo, tree, offset,
 556                         seq, callnumber);
 557                 break;
 558         case RX_PACKET_TYPE_ACKALL:
 559                 /* does not contain any payload */
 560                 if (check_col(pinfo->cinfo, COL_INFO)) {
 561                         col_add_fstr(pinfo->cinfo, COL_INFO,
 562                                 "ACKALL  "
 563                                 "Seq: %lu  "
 564                                 "Call: %lu  "
 565                                 "Source Port: %s  "
 566                                 "Destination Port: %s  ",
 567                                 (unsigned long)seq,
 568                                 (unsigned long)callnumber,
 569                                 get_udp_port(pinfo->srcport),
 570                                 get_udp_port(pinfo->destport)
 571                         );
 572                 }
 573                 break;
 574         case RX_PACKET_TYPE_CHALLENGE:
 575                 dissect_rx_challenge(tvb, pinfo, tree, offset, seq, callnumber);
 576                 break;
 577         case RX_PACKET_TYPE_RESPONSE:
 578                 dissect_rx_response(tvb, pinfo, tree, offset, seq, callnumber);
 579                 break;
 580         case RX_PACKET_TYPE_DATA: {
 581                 tvbuff_t *next_tvb;
 582                 void* pd_save;
 583                 pd_save = pinfo->private_data;
 584                 pinfo->private_data = &rxinfo;
 585                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
 586                 call_dissector(afs_handle, next_tvb, pinfo, parent_tree);
 587                 pinfo->private_data = pd_save;
 588                 };
 589                 break;
 590         case RX_PACKET_TYPE_ABORT:
 591                 dissect_rx_abort(tvb, pinfo, tree, offset, seq, callnumber);
 592                 break;
 593         }
 594
 595         return(tvb_length(tvb));
 596 }
 597
 598 void
 599 proto_register_rx(void)
 600 {
 601         static hf_register_info hf[] = {
 602                 { &hf_rx_epoch, {
 603                         "Epoch", "rx.epoch", FT_ABSOLUTE_TIME, BASE_NONE,
 604                         NULL, 0, NULL, HFILL }},
 605
 606                 { &hf_rx_cid, {
 607                         "CID", "rx.cid", FT_UINT32, BASE_DEC,
 608                         NULL, 0, NULL, HFILL }},
 609
 610                 { &hf_rx_callnumber, {
 611                         "Call Number", "rx.callnumber", FT_UINT32, BASE_DEC,
 612                         NULL, 0, NULL, HFILL }},
 613
 614                 { &hf_rx_seq, {
 615                         "Sequence Number", "rx.seq", FT_UINT32, BASE_DEC,
 616                         NULL, 0, NULL, HFILL }},
 617
 618                 { &hf_rx_serial, {
 619                         "Serial", "rx.serial", FT_UINT32, BASE_DEC,
 620                         NULL, 0, NULL, HFILL }},
 621
 622                 { &hf_rx_type, {
 623                         "Type", "rx.type", FT_UINT8, BASE_DEC,
 624                         VALS(rx_types), 0, NULL, HFILL }},
 625
 626                 { &hf_rx_flags, {
 627                         "Flags", "rx.flags", FT_UINT8, BASE_HEX,
 628                         NULL, 0, NULL, HFILL }},
 629
 630                 { &hf_rx_flags_clientinit, {
 631                         "Client Initiated", "rx.flags.client_init", FT_BOOLEAN, 8,
 632                         NULL, RX_CLIENT_INITIATED, NULL, HFILL }},
 633
 634                 { &hf_rx_flags_request_ack, {
 635                         "Request Ack", "rx.flags.request_ack", FT_BOOLEAN, 8,
 636                         NULL, RX_REQUEST_ACK, NULL, HFILL }},
 637
 638                 { &hf_rx_flags_last_packet, {
 639                         "Last Packet", "rx.flags.last_packet", FT_BOOLEAN, 8,
 640                         NULL, RX_LAST_PACKET, NULL, HFILL }},
 641
 642                 { &hf_rx_flags_more_packets, {
 643                         "More Packets", "rx.flags.more_packets", FT_BOOLEAN, 8,
 644                         NULL, RX_MORE_PACKETS, NULL, HFILL }},
 645
 646                 { &hf_rx_flags_free_packet, {
 647                         "Free Packet", "rx.flags.free_packet", FT_BOOLEAN, 8,
 648                         NULL, RX_FREE_PACKET, NULL, HFILL }},
 649
 650                 /* XXX - what about RX_SLOW_START_OR_JUMBO? */
 651
 652                 { &hf_rx_userstatus, {
 653                         "User Status", "rx.userstatus", FT_UINT32, BASE_DEC,
 654                         NULL, 0, NULL, HFILL }},
 655
 656                 { &hf_rx_securityindex, {
 657                         "Security Index", "rx.securityindex", FT_UINT32, BASE_DEC,
 658                         NULL, 0, NULL, HFILL }},
 659
 660                 { &hf_rx_spare, {
 661                         "Spare/Checksum", "rx.spare", FT_UINT16, BASE_DEC,
 662                         NULL, 0, NULL, HFILL }},
 663
 664                 { &hf_rx_serviceid, {
 665                         "Service ID", "rx.serviceid", FT_UINT16, BASE_DEC,
 666                         NULL, 0, NULL, HFILL }},
 667
 668                 { &hf_rx_bufferspace, {
 669                         "Bufferspace", "rx.bufferspace", FT_UINT16, BASE_DEC,
 670                         NULL, 0, "Number Of Packets Available", HFILL }},
 671
 672                 { &hf_rx_maxskew, {
 673                         "Max Skew", "rx.maxskew", FT_UINT16, BASE_DEC,
 674                         NULL, 0, NULL, HFILL }},
 675
 676                 { &hf_rx_first_packet, {
 677                         "First Packet", "rx.first", FT_UINT32, BASE_DEC,
 678                         NULL, 0, NULL, HFILL }},
 679
 680                 { &hf_rx_prev_packet, {
 681                         "Prev Packet", "rx.prev", FT_UINT32, BASE_DEC,
 682                         NULL, 0, "Previous Packet", HFILL }},
 683
 684                 { &hf_rx_reason, {
 685                         "Reason", "rx.reason", FT_UINT8, BASE_DEC,
 686                         VALS(rx_reason), 0, "Reason For This ACK", HFILL }},
 687
 688                 { &hf_rx_numacks, {
 689                         "Num ACKs", "rx.num_acks", FT_UINT8, BASE_DEC,
 690                         NULL, 0, "Number Of ACKs", HFILL }},
 691
 692                 { &hf_rx_ack_type, {
 693                         "ACK Type", "rx.ack_type", FT_UINT8, BASE_DEC,
 694                         VALS(rx_ack_type), 0, "Type Of ACKs", HFILL }},
 695
 696                 { &hf_rx_ack, {
 697                         "ACK Packet", "rx.ack", FT_NONE, BASE_NONE,
 698                         NULL, 0, NULL, HFILL }},
 699
 700                 { &hf_rx_challenge, {
 701                         "CHALLENGE Packet", "rx.challenge", FT_NONE, BASE_NONE,
 702                         NULL, 0, NULL, HFILL }},
 703
 704                 { &hf_rx_version, {
 705                         "Version", "rx.version", FT_UINT32, BASE_DEC,
 706                         NULL, 0, "Version Of Challenge/Response", HFILL }},
 707
 708                 { &hf_rx_nonce, {
 709                         "Nonce", "rx.nonce", FT_UINT32, BASE_HEX,
 710                         NULL, 0, NULL, HFILL }},
 711
 712                 { &hf_rx_inc_nonce, {
 713                         "Inc Nonce", "rx.inc_nonce", FT_UINT32, BASE_HEX,
 714                         NULL, 0, "Incremented Nonce", HFILL }},
 715
 716                 { &hf_rx_min_level, {
 717                         "Min Level", "rx.min_level", FT_UINT32, BASE_DEC,
 718                         NULL, 0, NULL, HFILL }},
 719
 720                 { &hf_rx_level, {
 721                         "Level", "rx.level", FT_UINT32, BASE_DEC,
 722                         NULL, 0, NULL, HFILL }},
 723
 724                 { &hf_rx_response, {
 725                         "RESPONSE Packet", "rx.response", FT_NONE, BASE_NONE,
 726                         NULL, 0, NULL, HFILL }},
 727
 728                 { &hf_rx_abort, {
 729                         "ABORT Packet", "rx.abort", FT_NONE, BASE_NONE,
 730                         NULL, 0, NULL, HFILL }},
 731
 732                 { &hf_rx_encrypted, {
 733                         "Encrypted", "rx.encrypted", FT_NONE, BASE_NONE,
 734                         NULL, 0, "Encrypted part of response packet", HFILL }},
 735
 736                 { &hf_rx_kvno, {
 737                         "kvno", "rx.kvno", FT_UINT32, BASE_DEC,
 738                         NULL, 0, NULL, HFILL }},
 739
 740                 { &hf_rx_ticket_len, {
 741                         "Ticket len", "rx.ticket_len", FT_UINT32, BASE_DEC,
 742                         NULL, 0, "Ticket Length", HFILL }},
 743
 744                 { &hf_rx_ticket, {
 745                         "ticket", "rx.ticket", FT_BYTES, BASE_NONE,
 746                         NULL, 0, "Ticket", HFILL }},
 747
 748                 { &hf_rx_ifmtu, {
 749                         "Interface MTU", "rx.if_mtu", FT_UINT32, BASE_DEC,
 750                         NULL, 0, NULL, HFILL }},
 751
 752                 { &hf_rx_maxmtu, {
 753                         "Max MTU", "rx.max_mtu", FT_UINT32, BASE_DEC,
 754                         NULL, 0, NULL, HFILL }},
 755
 756                 { &hf_rx_rwind, {
 757                         "rwind", "rx.rwind", FT_UINT32, BASE_DEC,
 758                         NULL, 0, NULL, HFILL }},
 759
 760                 { &hf_rx_maxpackets, {
 761                         "Max Packets", "rx.max_packets", FT_UINT32, BASE_DEC,
 762                         NULL, 0, NULL, HFILL }},
 763
 764                 { &hf_rx_abortcode, {
 765                         "Abort Code", "rx.abort_code", FT_UINT32, BASE_DEC,
 766                         NULL, 0, NULL, HFILL }},
 767
 768         };
 769         static gint *ett[] = {
 770                 &ett_rx,
 771                 &ett_rx_flags,
 772                 &ett_rx_ack,
 773                 &ett_rx_challenge,
 774                 &ett_rx_response,
 775                 &ett_rx_encrypted,
 776                 &ett_rx_abort
 777         };
 778
 779         proto_rx = proto_register_protocol("RX Protocol", "RX", "rx");
 780         proto_register_field_array(proto_rx, hf, array_length(hf));
 781         proto_register_subtree_array(ett, array_length(ett));
 782 }
 783
 784 void
 785 proto_reg_handoff_rx(void)
 786 {
 787         dissector_handle_t rx_handle;
 788
 789         int port;
 790
 791         /*
 792          * Get handle for the AFS dissector.
 793          */
 794         afs_handle = find_dissector("afs");
 795
 796         /* Ports in the range UDP_PORT_RX_LOW to UDP_PORT_RX_HIGH
 797            are all used for various AFS services. */
 798         rx_handle = new_create_dissector_handle(dissect_rx, proto_rx);
 799         for (port = UDP_PORT_RX_LOW; port <= UDP_PORT_RX_HIGH; port++)
 800                 dissector_add("udp.port", port, rx_handle);
 801         dissector_add("udp.port", UDP_PORT_RX_AFS_BACKUPS, rx_handle);
 802 }