epan/dissectors/packet-asap.c

   1 /* packet-asap.c
   2  * Routines for Aggregate Server Access Protocol (ASAP)
   3  * It is hopefully (needs testing) compliant to
   4  * RFC 5352
   5  * RFC 5354
   6  * RFC 5356
   7  * http://www.ietf.org/internet-drafts/draft-dreibholz-asap-hropt-03.txt
   8  * http://www.ietf.org/internet-drafts/draft-dreibholz-rserpool-delay-02.txt
   9  *
  10  * The code is not as simple as possible for the current protocol
  11  * but allows to be easily adopted to future versions of the protocol.
  12  * I will reconsider this after the protocol is an RFC.
  13  *
  14  * TODO:
  15  *   - check message lengths
  16  *
  17  * Copyright 2004, 2005, 2006, 2007 Michael Tuexen <tuexen [AT] fh-muenster.de>
  18  * Copyright 2008 Thomas Dreibholz <dreibh [AT] iem.uni-due.de>
  19  *
  20  * $Id$
  21  *
  22  * Wireshark - Network traffic analyzer
  23  * By Gerald Combs <gerald@wireshark.org>
  24  * Copyright 1998 Gerald Combs
  25  *
  26  * Copied from README.developer
  27  *
  28  * This program is free software; you can redistribute it and/or
  29  * modify it under the terms of the GNU General Public License
  30  * as published by the Free Software Foundation; either version 2
  31  * of the License, or (at your option) any later version.
  32  *
  33  * This program is distributed in the hope that it will be useful,
  34  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  35  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  36  * GNU General Public License for more details.
  37  *
  38  * You should have received a copy of the GNU General Public License
  39  * along with this program; if not, write to the Free Software
  40  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  41  */
  42
  43 #include "config.h"
  44
  45 #include <epan/packet.h>
  46 #include <epan/sctpppids.h>
  47
  48 /* Initialize the protocol and registered fields */
  49 static int proto_asap = -1;
  50 static int hf_cause_code = -1;
  51 static int hf_cause_length = -1;
  52 static int hf_cause_info = -1;
  53 static int hf_cause_padding = -1;
  54 static int hf_message_type = -1;
  55 static int hf_message_flags = -1;
  56 static int hf_message_length = -1;
  57 static int hf_parameter_type = -1;
  58 static int hf_parameter_length = -1;
  59 static int hf_parameter_value = -1;
  60 static int hf_parameter_padding = -1;
  61 static int hf_parameter_ipv4_address = -1;
  62 static int hf_parameter_ipv6_address = -1;
  63 static int hf_dccp_port = -1;
  64 static int hf_dccp_reserved = -1;
  65 static int hf_dccp_service_code = -1;
  66 static int hf_sctp_port = -1;
  67 static int hf_transport_use = -1;
  68 static int hf_tcp_port = -1;
  69 static int hf_udp_port = -1;
  70 static int hf_udp_reserved = -1;
  71 static int hf_udp_lite_port = -1;
  72 static int hf_udp_lite_reserved = -1;
  73 static int hf_policy_type = -1;
  74 static int hf_policy_value = -1;
  75 static int hf_policy_weight = -1;
  76 static int hf_policy_priority = -1;
  77 static int hf_policy_load = -1;
  78 static int hf_policy_degradation = -1;
  79 static int hf_policy_loaddpf = -1;
  80 static int hf_policy_weightdpf = -1;
  81 static int hf_policy_distance = -1;
  82 static int hf_pool_handle = -1;
  83 static int hf_pe_pe_identifier = -1;
  84 static int hf_home_enrp_id = -1;
  85 static int hf_reg_life = -1;
  86 static int hf_server_identifier = -1;
  87 static int hf_cookie = -1;
  88 static int hf_pe_identifier = -1;
  89 static int hf_pe_checksum = -1;
  90 static int hf_hropt_items = -1;
  91 static int hf_home_enrp_server_bit = -1;
  92 static int hf_reject_bit = -1;
  93
  94 /* Initialize the subtree pointers */
  95 static gint ett_asap = -1;
  96 static gint ett_asap_parameter = -1;
  97 static gint ett_asap_cause = -1;
  98 static gint ett_asap_flags = -1;
  99
 100 static void
 101 dissect_parameters(tvbuff_t *, proto_tree *);
 102 static void
 103 dissect_parameter(tvbuff_t *, proto_tree *);
 104 static void
 105 dissect_asap(tvbuff_t *, packet_info *, proto_tree *);
 106
 107 #define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
 108
 109 #define ASAP_UDP_PORT  3863
 110 #define ASAP_TCP_PORT  3863
 111 #define ASAP_SCTP_PORT 3863
 112
 113 /* Dissectors for error causes. This is common for ASAP and ENRP. */
 114
 115 #define CAUSE_CODE_LENGTH   2
 116 #define CAUSE_LENGTH_LENGTH 2
 117 #define CAUSE_HEADER_LENGTH (CAUSE_CODE_LENGTH + CAUSE_LENGTH_LENGTH)
 118
 119 #define CAUSE_HEADER_OFFSET 0
 120 #define CAUSE_CODE_OFFSET   CAUSE_HEADER_OFFSET
 121 #define CAUSE_LENGTH_OFFSET (CAUSE_CODE_OFFSET + CAUSE_CODE_LENGTH)
 122 #define CAUSE_INFO_OFFSET   (CAUSE_LENGTH_OFFSET + CAUSE_LENGTH_LENGTH)
 123
 124 static void
 125 dissect_unknown_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
 126 {
 127   guint16 code, length, cause_info_length;
 128
 129   code              = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET);
 130   length            = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET);
 131   cause_info_length = length - CAUSE_HEADER_LENGTH;
 132   if (cause_info_length > 0)
 133     proto_tree_add_item(cause_tree, hf_cause_info, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, ENC_NA);
 134   proto_item_append_text(cause_item, " (code %u and %u byte%s information)", code, cause_info_length, plurality(cause_info_length, "", "s"));
 135 }
 136
 137 #define UNRECOGNIZED_PARAMETER_CAUSE_CODE                  0x1
 138 #define UNRECONGNIZED_MESSAGE_CAUSE_CODE                   0x2
 139 #define INVALID_VALUES                                     0x3
 140 #define NON_UNIQUE_PE_IDENTIFIER                           0x4
 141 #define POOLING_POLICY_INCONSISTENT_CAUSE_CODE             0x5
 142 #define LACK_OF_RESOURCES_CAUSE_CODE                       0x6
 143 #define INCONSISTENT_TRANSPORT_TYPE_CAUSE_CODE             0x7
 144 #define INCONSISTENT_DATA_CONTROL_CONFIGURATION_CAUSE_CODE 0x8
 145 #define UNKNOWN_POOL_HANDLE                                0x9
 146 #define REJECTION_DUE_TO_SECURITY_CAUSE_CODE               0xa
 147
 148 static const value_string cause_code_values[] = {
 149   { UNRECOGNIZED_PARAMETER_CAUSE_CODE,                  "Unrecognized parameter"                  },
 150   { UNRECONGNIZED_MESSAGE_CAUSE_CODE,                   "Unrecognized message"                    },
 151   { INVALID_VALUES,                                     "Invalid values"                          },
 152   { NON_UNIQUE_PE_IDENTIFIER,                           "Non-unique PE identifier"                },
 153   { POOLING_POLICY_INCONSISTENT_CAUSE_CODE,             "Pooling policy inconsistent"             },
 154   { LACK_OF_RESOURCES_CAUSE_CODE,                       "Lack of resources"                       },
 155   { INCONSISTENT_TRANSPORT_TYPE_CAUSE_CODE,             "Inconsistent transport type"             },
 156   { INCONSISTENT_DATA_CONTROL_CONFIGURATION_CAUSE_CODE, "Inconsistent data/control type"          },
 157   { UNKNOWN_POOL_HANDLE,                                "Unknown pool handle"                     },
 158   { REJECTION_DUE_TO_SECURITY_CAUSE_CODE,               "Rejected due to security considerations" },
 159   { 0,                                                  NULL                                      } };
 160
 161 static void
 162 dissect_error_cause(tvbuff_t *cause_tvb, proto_tree *parameter_tree)
 163 {
 164   guint16 code, length, padding_length;
 165   proto_item *cause_item;
 166   proto_tree *cause_tree;
 167   tvbuff_t *parameter_tvb, *message_tvb;
 168
 169   code           = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET);
 170   length         = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET);
 171   padding_length = tvb_length(cause_tvb) - length;
 172
 173   cause_item = proto_tree_add_text(parameter_tree, cause_tvb, CAUSE_HEADER_OFFSET, tvb_length(cause_tvb),
 174                                    "%s", val_to_str_const(code, cause_code_values, "Unknown error cause"));
 175   cause_tree = proto_item_add_subtree(cause_item, ett_asap_cause);
 176
 177   proto_tree_add_item(cause_tree, hf_cause_code,   cause_tvb, CAUSE_CODE_OFFSET,   CAUSE_CODE_LENGTH,   ENC_BIG_ENDIAN);
 178   proto_tree_add_item(cause_tree, hf_cause_length, cause_tvb, CAUSE_LENGTH_OFFSET, CAUSE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 179
 180   switch(code) {
 181   case UNRECOGNIZED_PARAMETER_CAUSE_CODE:
 182     parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
 183     dissect_parameter(parameter_tvb, cause_tree);
 184     break;
 185   case UNRECONGNIZED_MESSAGE_CAUSE_CODE:
 186     message_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
 187     dissect_asap(message_tvb, NULL, cause_tree);
 188     break;
 189   case INVALID_VALUES:
 190     parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
 191     dissect_parameter(parameter_tvb, cause_tree);
 192     break;
 193   case NON_UNIQUE_PE_IDENTIFIER:
 194     break;
 195   case POOLING_POLICY_INCONSISTENT_CAUSE_CODE:
 196     parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
 197     dissect_parameter(parameter_tvb, cause_tree);
 198     break;
 199   case LACK_OF_RESOURCES_CAUSE_CODE:
 200     break;
 201   case INCONSISTENT_TRANSPORT_TYPE_CAUSE_CODE:
 202     parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
 203     dissect_parameter(parameter_tvb, cause_tree);
 204     break;
 205   case INCONSISTENT_DATA_CONTROL_CONFIGURATION_CAUSE_CODE:
 206     break;
 207   case UNKNOWN_POOL_HANDLE:
 208     break;
 209   case REJECTION_DUE_TO_SECURITY_CAUSE_CODE:
 210     break;
 211   default:
 212     dissect_unknown_cause(cause_tvb, cause_tree, cause_item);
 213     break;
 214   }
 215   if (padding_length > 0)
 216     proto_tree_add_item(cause_tree, hf_cause_padding, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length, ENC_NA);
 217 }
 218
 219 static void
 220 dissect_error_causes(tvbuff_t *error_causes_tvb, proto_tree *parameter_tree)
 221 {
 222   guint16 length, total_length;
 223   gint offset;
 224   tvbuff_t *error_cause_tvb;
 225
 226   offset = 0;
 227   while(tvb_reported_length_remaining(error_causes_tvb, offset) > 0) {
 228     length          = tvb_get_ntohs(error_causes_tvb, offset + CAUSE_LENGTH_OFFSET);
 229     total_length    = ADD_PADDING(length);
 230     error_cause_tvb = tvb_new_subset(error_causes_tvb, offset , total_length, total_length);
 231     dissect_error_cause(error_cause_tvb, parameter_tree);
 232     offset += total_length;
 233   }
 234 }
 235
 236 /* Dissectors for parameters. This is common for ASAP and ENRP. */
 237
 238 #define PARAMETER_TYPE_LENGTH   2
 239 #define PARAMETER_LENGTH_LENGTH 2
 240 #define PARAMETER_HEADER_LENGTH (PARAMETER_TYPE_LENGTH + PARAMETER_LENGTH_LENGTH)
 241
 242 #define PARAMETER_HEADER_OFFSET 0
 243 #define PARAMETER_TYPE_OFFSET   PARAMETER_HEADER_OFFSET
 244 #define PARAMETER_LENGTH_OFFSET (PARAMETER_TYPE_OFFSET + PARAMETER_TYPE_LENGTH)
 245 #define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
 246
 247 #define IPV4_ADDRESS_LENGTH 4
 248 #define IPV4_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
 249
 250 static void
 251 dissect_ipv4_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 252 {
 253   proto_tree_add_item(parameter_tree, hf_parameter_ipv4_address, parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH, ENC_BIG_ENDIAN);
 254   proto_item_append_text(parameter_item, " (%s)", tvb_ip_to_str(parameter_tvb, IPV4_ADDRESS_OFFSET));
 255 }
 256
 257 #define IPV6_ADDRESS_LENGTH 16
 258 #define IPV6_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
 259
 260 static void
 261 dissect_ipv6_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 262 {
 263   proto_tree_add_item(parameter_tree, hf_parameter_ipv6_address, parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH, ENC_NA);
 264   proto_item_append_text(parameter_item, " (%s)", tvb_ip6_to_str(parameter_tvb, IPV6_ADDRESS_OFFSET));
 265 }
 266
 267 #define DCCP_PORT_LENGTH         2
 268 #define DCCP_RESERVED_LENGTH     2
 269 #define DCCP_SERVICE_CODE_LENGTH 4
 270 #define DCCP_PORT_OFFSET         PARAMETER_VALUE_OFFSET
 271 #define DCCP_RESERVED_OFFSET     (DCCP_PORT_OFFSET + DCCP_PORT_LENGTH)
 272 #define DCCP_SERVICE_CODE_OFFSET (DCCP_RESERVED_OFFSET + DCCP_RESERVED_LENGTH)
 273 #define DCCP_ADDRESS_OFFSET      (DCCP_SERVICE_CODE_OFFSET + DCCP_SERVICE_CODE_LENGTH)
 274
 275 static void
 276 dissect_dccp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 277 {
 278   tvbuff_t *parameters_tvb;
 279
 280   proto_tree_add_item(parameter_tree, hf_dccp_port,         parameter_tvb, DCCP_PORT_OFFSET,         DCCP_PORT_LENGTH,         ENC_BIG_ENDIAN);
 281   proto_tree_add_item(parameter_tree, hf_dccp_reserved,     parameter_tvb, DCCP_RESERVED_OFFSET,     DCCP_RESERVED_LENGTH,     ENC_BIG_ENDIAN);
 282   proto_tree_add_item(parameter_tree, hf_dccp_service_code, parameter_tvb, DCCP_SERVICE_CODE_OFFSET, DCCP_SERVICE_CODE_LENGTH, ENC_BIG_ENDIAN);
 283
 284   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, DCCP_ADDRESS_OFFSET);
 285   dissect_parameters(parameters_tvb, parameter_tree);
 286 }
 287
 288 #define TRANSPORT_USE_DATA_ONLY         0
 289 #define TRANSPORT_USE_DATA_PLUS_CONTROL 1
 290
 291 static const value_string transport_use_values[] = {
 292   { TRANSPORT_USE_DATA_ONLY,          "Data only"         },
 293   { TRANSPORT_USE_DATA_PLUS_CONTROL,  "Data plus control" },
 294   { 0,                                NULL                } };
 295
 296 #define SCTP_PORT_LENGTH          2
 297 #define SCTP_TRANSPORT_USE_LENGTH 2
 298 #define SCTP_PORT_OFFSET          PARAMETER_VALUE_OFFSET
 299 #define SCTP_TRANSPORT_USE_OFFSET (SCTP_PORT_OFFSET + SCTP_PORT_LENGTH)
 300 #define SCTP_ADDRESS_OFFSET       (SCTP_TRANSPORT_USE_OFFSET + SCTP_TRANSPORT_USE_LENGTH)
 301
 302 static void
 303 dissect_sctp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 304 {
 305   tvbuff_t *parameters_tvb;
 306
 307   proto_tree_add_item(parameter_tree, hf_sctp_port,     parameter_tvb, SCTP_PORT_OFFSET,          SCTP_PORT_LENGTH,          ENC_BIG_ENDIAN);
 308   proto_tree_add_item(parameter_tree, hf_transport_use, parameter_tvb, SCTP_TRANSPORT_USE_OFFSET, SCTP_TRANSPORT_USE_LENGTH, ENC_BIG_ENDIAN);
 309
 310   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, SCTP_ADDRESS_OFFSET);
 311   dissect_parameters(parameters_tvb, parameter_tree);
 312 }
 313
 314 #define TCP_PORT_LENGTH          2
 315 #define TCP_TRANSPORT_USE_LENGTH 2
 316 #define TCP_PORT_OFFSET          PARAMETER_VALUE_OFFSET
 317 #define TCP_TRANSPORT_USE_OFFSET (TCP_PORT_OFFSET + TCP_PORT_LENGTH)
 318 #define TCP_ADDRESS_OFFSET       (TCP_TRANSPORT_USE_OFFSET + TCP_TRANSPORT_USE_LENGTH)
 319
 320 static void
 321 dissect_tcp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 322 {
 323   tvbuff_t *parameters_tvb;
 324
 325   proto_tree_add_item(parameter_tree, hf_tcp_port,      parameter_tvb, TCP_PORT_OFFSET,          TCP_PORT_LENGTH,          ENC_BIG_ENDIAN);
 326   proto_tree_add_item(parameter_tree, hf_transport_use, parameter_tvb, TCP_TRANSPORT_USE_OFFSET, TCP_TRANSPORT_USE_LENGTH, ENC_BIG_ENDIAN);
 327
 328   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, TCP_ADDRESS_OFFSET);
 329   dissect_parameters(parameters_tvb, parameter_tree);
 330 }
 331
 332 #define UDP_PORT_LENGTH     2
 333 #define UDP_RESERVED_LENGTH 2
 334 #define UDP_PORT_OFFSET     PARAMETER_VALUE_OFFSET
 335 #define UDP_RESERVED_OFFSET (UDP_PORT_OFFSET + UDP_PORT_LENGTH)
 336 #define UDP_ADDRESS_OFFSET  (UDP_RESERVED_OFFSET + UDP_RESERVED_LENGTH)
 337
 338 static void
 339 dissect_udp_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 340 {
 341   tvbuff_t *parameters_tvb;
 342
 343   proto_tree_add_item(parameter_tree, hf_udp_port,     parameter_tvb, UDP_PORT_OFFSET,     UDP_PORT_LENGTH,     ENC_BIG_ENDIAN);
 344   proto_tree_add_item(parameter_tree, hf_udp_reserved, parameter_tvb, UDP_RESERVED_OFFSET, UDP_RESERVED_LENGTH, ENC_BIG_ENDIAN);
 345
 346   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, UDP_ADDRESS_OFFSET);
 347   dissect_parameters(parameters_tvb, parameter_tree);
 348 }
 349
 350 #define UDP_LITE_PORT_LENGTH     2
 351 #define UDP_LITE_RESERVED_LENGTH 2
 352 #define UDP_LITE_PORT_OFFSET     PARAMETER_VALUE_OFFSET
 353 #define UDP_LITE_RESERVED_OFFSET (UDP_LITE_PORT_OFFSET + UDP_LITE_PORT_LENGTH)
 354 #define UDP_LITE_ADDRESS_OFFSET  (UDP_LITE_RESERVED_OFFSET + UDP_LITE_RESERVED_LENGTH)
 355
 356 static void
 357 dissect_udp_lite_transport_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 358 {
 359   tvbuff_t *parameters_tvb;
 360
 361   proto_tree_add_item(parameter_tree, hf_udp_lite_port,     parameter_tvb, UDP_LITE_PORT_OFFSET,     UDP_LITE_PORT_LENGTH,     ENC_BIG_ENDIAN);
 362   proto_tree_add_item(parameter_tree, hf_udp_lite_reserved, parameter_tvb, UDP_LITE_RESERVED_OFFSET, UDP_LITE_RESERVED_LENGTH, ENC_BIG_ENDIAN);
 363
 364   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, UDP_LITE_ADDRESS_OFFSET);
 365   dissect_parameters(parameters_tvb, parameter_tree);
 366 }
 367
 368 #define POLICY_TYPE_LENGTH               4
 369 #define POLICY_WEIGHT_LENGTH             4
 370 #define POLICY_PRIORITY_LENGTH           4
 371 #define POLICY_LOAD_LENGTH               4
 372 #define POLICY_DEGRADATION_LENGTH        4
 373 #define POLICY_LUDPF_LOADDPF_LENGTH      4
 374 #define POLICY_LUDPF_DISTANCE_LENGTH     4
 375 #define POLICY_WRANDDPF_WEIGHTDPF_LENGTH 4
 376 #define POLICY_WRANDDPF_DISTANCE_LENGTH  4
 377
 378 #define POLICY_TYPE_OFFSET        PARAMETER_VALUE_OFFSET
 379 #define POLICY_VALUE_OFFSET       (POLICY_TYPE_OFFSET + POLICY_TYPE_LENGTH)
 380 #define POLICY_WEIGHT_OFFSET      POLICY_VALUE_OFFSET
 381 #define POLICY_PRIORITY_OFFSET    POLICY_VALUE_OFFSET
 382 #define POLICY_LOAD_OFFSET        POLICY_VALUE_OFFSET
 383 #define POLICY_DEGRADATION_OFFSET (POLICY_LOAD_OFFSET + POLICY_LOAD_LENGTH)
 384
 385 #define POLICY_LUDPF_LOADDPF_OFFSET      (POLICY_LOAD_OFFSET + POLICY_LOAD_LENGTH)
 386 #define POLICY_LUDPF_DISTANCE_OFFSET     (POLICY_LUDPF_LOADDPF_OFFSET + POLICY_LUDPF_LOADDPF_LENGTH)
 387 #define POLICY_WRANDDPF_WEIGHTDPF_OFFSET (POLICY_WEIGHT_OFFSET + POLICY_WEIGHT_LENGTH)
 388 #define POLICY_WRANDDPF_DISTANCE_OFFSET  (POLICY_WRANDDPF_WEIGHTDPF_OFFSET + POLICY_WRANDDPF_WEIGHTDPF_LENGTH)
 389
 390
 391 #define ROUND_ROBIN_POLICY           0x00000001
 392 #define WEIGHTED_ROUND_ROBIN_POLICY  0x00000002
 393 #define RANDOM_POLICY                0x00000003
 394 #define WEIGHTED_RANDOM_POLICY       0x00000004
 395 #define PRIORITY_POLICY              0x00000005
 396 #define LEAST_USED_POLICY            0x40000001
 397 #define LEAST_USED_WITH_DEG_POLICY   0x40000002
 398 #define PRIORITY_LEAST_USED_POLICY   0x40000003
 399 #define RANDOMIZED_LEAST_USED_POLICY 0x40000004
 400
 401 #define PRIORITY_LEAST_USED_DEG_POLICY 0xb0001003
 402 #define WEIGHTED_RANDOM_DPF_POLICY     0xb0002001
 403 #define LEAST_USED_DPF_POLICY          0xb0002002
 404
 405 static const value_string policy_type_values[] = {
 406   { ROUND_ROBIN_POLICY,             "Round Robin (RR)" },
 407   { WEIGHTED_ROUND_ROBIN_POLICY,    "Weighted Round Robin (WRR)" },
 408   { RANDOM_POLICY,                  "Random (RAND)"},
 409   { WEIGHTED_RANDOM_POLICY,         "Weighted Random (WRAND)" },
 410   { PRIORITY_POLICY,                "Priority (PRI)" },
 411   { LEAST_USED_POLICY,              "Least Used (LU)" },
 412   { LEAST_USED_WITH_DEG_POLICY,     "Least Used with Degradation (LUD)" },
 413   { PRIORITY_LEAST_USED_POLICY,     "Priority Least Used (PLU)" },
 414   { PRIORITY_LEAST_USED_DEG_POLICY, "Priority Least Used with Degradation (PLUD)" },
 415   { RANDOMIZED_LEAST_USED_POLICY,   "Randomized Least Used (RLU)" },
 416   { LEAST_USED_DPF_POLICY,          "Least Used with Delay Penalty Factor (LU-DPF)" },
 417   { WEIGHTED_RANDOM_DPF_POLICY,     "Weighted Random with Delay Penalty Factor (WRAND-DPF)" },
 418   { 0,                              NULL } };
 419
 420 static void
 421 dissect_pool_member_selection_policy_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 422 {
 423   guint32 type;
 424   guint   length;
 425
 426   proto_tree_add_item(parameter_tree, hf_policy_type,  parameter_tvb, POLICY_TYPE_OFFSET,  POLICY_TYPE_LENGTH,  ENC_BIG_ENDIAN);
 427   type = tvb_get_ntohl(parameter_tvb, POLICY_TYPE_OFFSET);
 428   switch (type) {
 429   case RANDOM_POLICY:
 430   case ROUND_ROBIN_POLICY:
 431     break;
 432   case WEIGHTED_RANDOM_POLICY:
 433   case WEIGHTED_ROUND_ROBIN_POLICY:
 434     proto_tree_add_item(parameter_tree, hf_policy_weight, parameter_tvb, POLICY_WEIGHT_OFFSET, POLICY_WEIGHT_LENGTH, ENC_BIG_ENDIAN);
 435     break;
 436   case PRIORITY_POLICY:
 437     proto_tree_add_item(parameter_tree, hf_policy_priority, parameter_tvb, POLICY_PRIORITY_OFFSET, POLICY_PRIORITY_LENGTH, ENC_BIG_ENDIAN);
 438     break;
 439   case LEAST_USED_POLICY:
 440   case RANDOMIZED_LEAST_USED_POLICY:
 441     proto_tree_add_double_format_value(parameter_tree, hf_policy_load, parameter_tvb, POLICY_LOAD_OFFSET, POLICY_LOAD_LENGTH,
 442                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff, "%1.2f%%",
 443                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff);
 444     break;
 445   case LEAST_USED_WITH_DEG_POLICY:
 446   case PRIORITY_LEAST_USED_POLICY:
 447     proto_tree_add_double_format_value(parameter_tree, hf_policy_load, parameter_tvb, POLICY_LOAD_OFFSET, POLICY_LOAD_LENGTH,
 448                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff, "%1.2f%%",
 449                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff);
 450     proto_tree_add_double_format_value(parameter_tree, hf_policy_degradation, parameter_tvb, POLICY_DEGRADATION_OFFSET, POLICY_DEGRADATION_LENGTH,
 451                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_DEGRADATION_OFFSET) / (double)0xffffffff, "%1.2f%%",
 452                                        100.0 * tvb_get_ntohl(parameter_tvb, POLICY_DEGRADATION_OFFSET) / (double)0xffffffff);
 453     break;
 454   case LEAST_USED_DPF_POLICY:
 455     proto_tree_add_double_format_value(parameter_tree, hf_policy_load, parameter_tvb, POLICY_LOAD_OFFSET, POLICY_LOAD_LENGTH,
 456                                       100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff, "%1.2f%%",
 457                                       100.0 * tvb_get_ntohl(parameter_tvb, POLICY_LOAD_OFFSET) / (double)0xffffffff);
 458     proto_tree_add_double_format_value(parameter_tree, hf_policy_loaddpf, parameter_tvb, POLICY_LUDPF_LOADDPF_OFFSET, POLICY_LUDPF_LOADDPF_LENGTH,
 459                                       tvb_get_ntohl(parameter_tvb, POLICY_LUDPF_LOADDPF_OFFSET) / (double)0xffffffff, "%1.5f",
 460                                       tvb_get_ntohl(parameter_tvb, POLICY_LUDPF_LOADDPF_OFFSET) / (double)0xffffffff);
 461     proto_tree_add_item(parameter_tree, hf_policy_distance, parameter_tvb, POLICY_LUDPF_DISTANCE_OFFSET, POLICY_LUDPF_DISTANCE_LENGTH, ENC_BIG_ENDIAN);
 462     break;
 463   case WEIGHTED_RANDOM_DPF_POLICY:
 464     proto_tree_add_item(parameter_tree, hf_policy_weight, parameter_tvb, POLICY_WEIGHT_OFFSET, POLICY_WEIGHT_LENGTH, ENC_BIG_ENDIAN);
 465     proto_tree_add_double_format_value(parameter_tree, hf_policy_weightdpf, parameter_tvb, POLICY_WRANDDPF_WEIGHTDPF_OFFSET, POLICY_WRANDDPF_WEIGHTDPF_LENGTH,
 466                                        tvb_get_ntohl(parameter_tvb, POLICY_WRANDDPF_WEIGHTDPF_OFFSET) / (double)0xffffffff, "%1.5f",
 467                                        tvb_get_ntohl(parameter_tvb, POLICY_WRANDDPF_WEIGHTDPF_OFFSET) / (double)0xffffffff);
 468     proto_tree_add_item(parameter_tree, hf_policy_distance, parameter_tvb, POLICY_WRANDDPF_DISTANCE_OFFSET, POLICY_WRANDDPF_DISTANCE_LENGTH, ENC_BIG_ENDIAN);
 469     break;
 470   default:
 471     length = tvb_length(parameter_tvb) - POLICY_VALUE_OFFSET;
 472     if (length > 0) {
 473       proto_tree_add_item(parameter_tree, hf_policy_value, parameter_tvb, POLICY_VALUE_OFFSET, length, ENC_NA);
 474     }
 475     break;
 476   }
 477 }
 478
 479 #define POOL_HANDLE_OFFSET PARAMETER_VALUE_OFFSET
 480
 481 static void
 482 dissect_pool_handle_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 483 {
 484   guint16 handle_length;
 485   proto_item*    pi;
 486   char*          tmp;
 487
 488   handle_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 489   pi = proto_tree_add_item(parameter_tree, hf_pool_handle, parameter_tvb, POOL_HANDLE_OFFSET, handle_length, ENC_NA);
 490
 491   tmp = (gchar*)tvb_get_ephemeral_string(parameter_tvb, POOL_HANDLE_OFFSET, handle_length);
 492   proto_item_append_text(pi, " (%s)", tmp);
 493 }
 494
 495 #define PE_PE_IDENTIFIER_LENGTH         4
 496 #define HOME_ENRP_INDENTIFIER_LENGTH    4
 497 #define REGISTRATION_LIFE_LENGTH        4
 498
 499 #define PE_PE_IDENTIFIER_OFFSET         PARAMETER_VALUE_OFFSET
 500 #define HOME_ENRP_INDENTIFIER_OFFSET    (PE_PE_IDENTIFIER_OFFSET + PE_PE_IDENTIFIER_LENGTH)
 501 #define REGISTRATION_LIFE_OFFSET        (HOME_ENRP_INDENTIFIER_OFFSET + HOME_ENRP_INDENTIFIER_LENGTH)
 502 #define USER_TRANSPORT_PARAMETER_OFFSET (REGISTRATION_LIFE_OFFSET + REGISTRATION_LIFE_LENGTH)
 503
 504 static void
 505 dissect_pool_element_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 506 {
 507   tvbuff_t*   parameters_tvb;
 508   proto_item* pi;
 509
 510   proto_tree_add_item(parameter_tree, hf_pe_pe_identifier, parameter_tvb, PE_PE_IDENTIFIER_OFFSET,      PE_PE_IDENTIFIER_LENGTH,      ENC_BIG_ENDIAN);
 511   proto_tree_add_item(parameter_tree, hf_home_enrp_id,     parameter_tvb, HOME_ENRP_INDENTIFIER_OFFSET, HOME_ENRP_INDENTIFIER_LENGTH, ENC_BIG_ENDIAN);
 512   pi = proto_tree_add_item(parameter_tree, hf_reg_life,    parameter_tvb, REGISTRATION_LIFE_OFFSET,     REGISTRATION_LIFE_LENGTH,     ENC_BIG_ENDIAN);
 513   proto_item_append_text(pi, "ms");
 514
 515   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, USER_TRANSPORT_PARAMETER_OFFSET);
 516   dissect_parameters(parameters_tvb, parameter_tree);
 517 }
 518
 519 #define SERVER_ID_LENGTH         4
 520 #define SERVER_ID_OFFSET         PARAMETER_VALUE_OFFSET
 521 #define SERVER_TRANSPORT_OFFSET  (SERVER_ID_OFFSET + SERVER_ID_LENGTH)
 522
 523 static void
 524 dissect_server_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 525 {
 526   tvbuff_t *parameters_tvb;
 527
 528   proto_tree_add_item(parameter_tree, hf_server_identifier, parameter_tvb, SERVER_ID_OFFSET, SERVER_ID_LENGTH, ENC_BIG_ENDIAN);
 529
 530   parameters_tvb = tvb_new_subset_remaining(parameter_tvb, SERVER_TRANSPORT_OFFSET);
 531   dissect_parameters(parameters_tvb, parameter_tree);
 532 }
 533
 534 #define ERROR_CAUSES_OFFSET PARAMETER_VALUE_OFFSET
 535
 536 static void
 537 dissect_operation_error_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 538 {
 539   tvbuff_t *error_causes_tvb;
 540
 541   error_causes_tvb = tvb_new_subset_remaining(parameter_tvb, ERROR_CAUSES_OFFSET);
 542   dissect_error_causes(error_causes_tvb, parameter_tree);
 543 }
 544
 545 #define COOKIE_OFFSET PARAMETER_VALUE_OFFSET
 546
 547 static void
 548 dissect_cookie_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 549 {
 550   guint16 cookie_length;
 551
 552   cookie_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 553   if (cookie_length > 0)
 554     proto_tree_add_item(parameter_tree, hf_cookie, parameter_tvb, COOKIE_OFFSET, cookie_length, ENC_NA);
 555   proto_item_append_text(parameter_item, " (%u byte%s)", cookie_length, plurality(cookie_length, "", "s"));
 556 }
 557
 558 #define PE_IDENTIFIER_LENGTH 4
 559 #define PE_IDENTIFIER_OFFSET PARAMETER_VALUE_OFFSET
 560
 561 static void
 562 dissect_pe_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 563 {
 564   proto_tree_add_item(parameter_tree, hf_pe_identifier, parameter_tvb, PE_IDENTIFIER_OFFSET, PE_IDENTIFIER_LENGTH, ENC_BIG_ENDIAN);
 565   proto_item_append_text(parameter_item, " (0x%x)", tvb_get_ntohl(parameter_tvb, PE_IDENTIFIER_OFFSET));
 566 }
 567
 568 #define PE_CHECKSUM_LENGTH 2
 569 #define PE_CHECKSUM_OFFSET PARAMETER_VALUE_OFFSET
 570
 571 static void
 572 dissect_pe_checksum_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 573 {
 574   proto_tree_add_item(parameter_tree, hf_pe_checksum, parameter_tvb, PE_CHECKSUM_OFFSET, PE_CHECKSUM_LENGTH, ENC_BIG_ENDIAN);
 575   proto_item_append_text(parameter_item, " (0x%x)", tvb_get_ntohs(parameter_tvb, PE_CHECKSUM_OFFSET));
 576 }
 577
 578 #define HROPT_ITEMS_LENGTH 4
 579 #define HROPT_ITEMS_OFFSET PARAMETER_VALUE_OFFSET
 580
 581 static void
 582 dissect_handle_resolution_option_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 583 {
 584   proto_tree_add_item(parameter_tree, hf_hropt_items, parameter_tvb, HROPT_ITEMS_OFFSET, HROPT_ITEMS_LENGTH, ENC_BIG_ENDIAN);
 585 }
 586
 587 static void
 588 dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 589 {
 590   guint16 type, parameter_value_length;
 591
 592   type                   = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
 593   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 594
 595   if (parameter_value_length > 0)
 596     proto_tree_add_item(parameter_tree, hf_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);
 597
 598   proto_item_append_text(parameter_item, " (type %u and %u byte%s value)", type, parameter_value_length, plurality(parameter_value_length, "", "s"));
 599 }
 600
 601 #define IPV4_ADDRESS_PARAMETER_TYPE                 0x01
 602 #define IPV6_ADDRESS_PARAMETER_TYPE                 0x02
 603 #define DCCP_TRANSPORT_PARAMETER_TYPE               0x03
 604 #define SCTP_TRANSPORT_PARAMETER_TYPE               0x04
 605 #define TCP_TRANSPORT_PARAMETER_TYPE                0x05
 606 #define UDP_TRANSPORT_PARAMETER_TYPE                0x06
 607 #define UDP_LITE_TRANSPORT_PARAMETER_TYPE           0x07
 608 #define POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE 0x08
 609 #define POOL_HANDLE_PARAMETER_TYPE                  0x09
 610 #define POOL_ELEMENT_PARAMETER_TYPE                 0x0a
 611 #define SERVER_INFORMATION_PARAMETER_TYPE           0x0b
 612 #define OPERATION_ERROR_PARAMETER_TYPE              0x0c
 613 #define COOKIE_PARAMETER_TYPE                       0x0d
 614 #define PE_IDENTIFIER_PARAMETER_TYPE                0x0e
 615 #define PE_CHECKSUM_PARAMETER_TYPE                  0x0f
 616 #define HANDLE_RESOLUTION_OPTION_PARAMETER_TYPE     0x803f
 617
 618 static const value_string parameter_type_values[] = {
 619   { IPV4_ADDRESS_PARAMETER_TYPE,                 "IPV4 Address Parameter" },
 620   { IPV6_ADDRESS_PARAMETER_TYPE,                 "IPV6 Address Parameter" },
 621   { DCCP_TRANSPORT_PARAMETER_TYPE,               "DCCP Transport Address Parameter" },
 622   { SCTP_TRANSPORT_PARAMETER_TYPE,               "SCTP Transport Address Parameter" },
 623   { TCP_TRANSPORT_PARAMETER_TYPE,                "TCP Transport Address Parameter" },
 624   { UDP_TRANSPORT_PARAMETER_TYPE,                "UDP Transport Address Parameter" },
 625   { UDP_LITE_TRANSPORT_PARAMETER_TYPE,           "UDP-Lite Transport Address Parameter" },
 626   { POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE, "Pool Member Selection Policy Parameter" },
 627   { POOL_HANDLE_PARAMETER_TYPE,                  "Pool Handle Parameter" },
 628   { POOL_ELEMENT_PARAMETER_TYPE,                 "Pool Element Parameter" },
 629   { SERVER_INFORMATION_PARAMETER_TYPE,           "Server Information Parameter" },
 630   { OPERATION_ERROR_PARAMETER_TYPE,              "Operation Error Parameter" },
 631   { COOKIE_PARAMETER_TYPE,                       "Cookie Parameter" },
 632   { PE_IDENTIFIER_PARAMETER_TYPE,                "Pool Element Identifier Parameter" },
 633   { PE_CHECKSUM_PARAMETER_TYPE,                  "PE Checksum Parameter" },
 634   { HANDLE_RESOLUTION_OPTION_PARAMETER_TYPE,     "Handle Resolution Option Parameter" },
 635   { 0,                                           NULL } };
 636
 637
 638 static void
 639 dissect_parameter(tvbuff_t *parameter_tvb, proto_tree *asap_tree)
 640 {
 641   guint16 type, length, padding_length;
 642   proto_item *parameter_item;
 643   proto_tree *parameter_tree;
 644
 645   /* extract tag and length from the parameter */
 646   type           = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
 647   length         = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
 648   padding_length = tvb_length(parameter_tvb) - length;
 649
 650   /* create proto_tree stuff */
 651   parameter_item   = proto_tree_add_text(asap_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb), "%s", val_to_str_const(type, parameter_type_values, "Unknown Parameter"));
 652   parameter_tree   = proto_item_add_subtree(parameter_item, ett_asap_parameter);
 653
 654   /* add tag and length to the asap tree */
 655   proto_tree_add_item(parameter_tree, hf_parameter_type,   parameter_tvb, PARAMETER_TYPE_OFFSET,   PARAMETER_TYPE_LENGTH,   ENC_BIG_ENDIAN);
 656   proto_tree_add_item(parameter_tree, hf_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 657
 658   switch(type) {
 659   case IPV4_ADDRESS_PARAMETER_TYPE:
 660     dissect_ipv4_parameter(parameter_tvb, parameter_tree, parameter_item);
 661     break;
 662   case IPV6_ADDRESS_PARAMETER_TYPE:
 663     dissect_ipv6_parameter(parameter_tvb, parameter_tree, parameter_item);
 664     break;
 665   case DCCP_TRANSPORT_PARAMETER_TYPE:
 666     dissect_dccp_transport_parameter(parameter_tvb, parameter_tree);
 667     break;
 668   case SCTP_TRANSPORT_PARAMETER_TYPE:
 669     dissect_sctp_transport_parameter(parameter_tvb, parameter_tree);
 670     break;
 671   case TCP_TRANSPORT_PARAMETER_TYPE:
 672     dissect_tcp_transport_parameter(parameter_tvb, parameter_tree);
 673     break;
 674   case UDP_TRANSPORT_PARAMETER_TYPE:
 675     dissect_udp_transport_parameter(parameter_tvb, parameter_tree);
 676     break;
 677   case UDP_LITE_TRANSPORT_PARAMETER_TYPE:
 678     dissect_udp_lite_transport_parameter(parameter_tvb, parameter_tree);
 679     break;
 680   case POOL_MEMBER_SELECTION_POLICY_PARAMETER_TYPE:
 681     dissect_pool_member_selection_policy_parameter(parameter_tvb, parameter_tree);
 682     break;
 683   case POOL_HANDLE_PARAMETER_TYPE:
 684     dissect_pool_handle_parameter(parameter_tvb, parameter_tree);
 685     break;
 686   case POOL_ELEMENT_PARAMETER_TYPE:
 687     dissect_pool_element_parameter(parameter_tvb, parameter_tree);
 688     break;
 689   case SERVER_INFORMATION_PARAMETER_TYPE:
 690     dissect_server_information_parameter(parameter_tvb, parameter_tree);
 691     break;
 692   case OPERATION_ERROR_PARAMETER_TYPE:
 693     dissect_operation_error_parameter(parameter_tvb, parameter_tree);
 694     break;
 695   case COOKIE_PARAMETER_TYPE:
 696     dissect_cookie_parameter(parameter_tvb, parameter_tree, parameter_item);
 697     break;
 698   case PE_IDENTIFIER_PARAMETER_TYPE:
 699     dissect_pe_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 700     break;
 701   case PE_CHECKSUM_PARAMETER_TYPE:
 702     dissect_pe_checksum_parameter(parameter_tvb, parameter_tree, parameter_item);
 703     break;
 704   case HANDLE_RESOLUTION_OPTION_PARAMETER_TYPE:
 705     dissect_handle_resolution_option_parameter(parameter_tvb, parameter_tree);
 706     break;
 707   default:
 708     dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
 709     break;
 710   };
 711
 712   if (padding_length > 0)
 713     proto_tree_add_item(parameter_tree, hf_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, ENC_NA);
 714 }
 715
 716 static void
 717 dissect_parameters(tvbuff_t *parameters_tvb, proto_tree *tree)
 718 {
 719   gint offset, length, total_length, remaining_length;
 720   tvbuff_t *parameter_tvb;
 721
 722   offset = 0;
 723   while((remaining_length = tvb_length_remaining(parameters_tvb, offset)) > 0) {
 724     length       = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
 725     total_length = ADD_PADDING(length);
 726     if (remaining_length >= length)
 727       total_length = MIN(total_length, remaining_length);
 728     /* create a tvb for the parameter including the padding bytes */
 729     parameter_tvb  = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
 730     dissect_parameter(parameter_tvb, tree);
 731     /* get rid of the handled parameter */
 732     offset += total_length;
 733   }
 734 }
 735
 736 /* Dissectors for messages. This is specific to ASAP */
 737
 738 #define MESSAGE_TYPE_LENGTH   1
 739 #define MESSAGE_FLAGS_LENGTH  1
 740 #define MESSAGE_LENGTH_LENGTH 2
 741
 742 #define MESSAGE_TYPE_OFFSET   0
 743 #define MESSAGE_FLAGS_OFFSET  (MESSAGE_TYPE_OFFSET   + MESSAGE_TYPE_LENGTH)
 744 #define MESSAGE_LENGTH_OFFSET (MESSAGE_FLAGS_OFFSET  + MESSAGE_FLAGS_LENGTH)
 745 #define MESSAGE_VALUE_OFFSET  (MESSAGE_LENGTH_OFFSET + MESSAGE_LENGTH_LENGTH)
 746
 747 #define REGISTRATION_MESSAGE_TYPE               0x01
 748 #define DEREGISTRATION_MESSAGE_TYPE             0x02
 749 #define REGISTRATION_RESPONSE_MESSAGE_TYPE      0x03
 750 #define DEREGISTRATION_RESPONSE_MESSAGE_TYPE    0x04
 751 #define HANDLE_RESOLUTION_MESSAGE_TYPE          0x05
 752 #define HANDLE_RESOLUTION_RESPONSE_MESSAGE_TYPE 0x06
 753 #define ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE        0x07
 754 #define ENDPOINT_KEEP_ALIVE_ACK_MESSAGE_TYPE    0x08
 755 #define ENDPOINT_UNREACHABLE_MESSAGE_TYPE       0x09
 756 #define SERVER_ANNOUNCE_MESSAGE_TYPE            0x0a
 757 #define COOKIE_MESSAGE_TYPE                     0x0b
 758 #define COOKIE_ECHO_MESSAGE_TYPE                0x0c
 759 #define BUSINESS_CARD_MESSAGE_TYPE              0x0d
 760 #define ERROR_MESSAGE_TYPE                      0x0e
 761
 762 static const value_string message_type_values[] = {
 763   { REGISTRATION_MESSAGE_TYPE,               "ASAP Registration" },
 764   { DEREGISTRATION_MESSAGE_TYPE,             "ASAP Deregistration" },
 765   { REGISTRATION_RESPONSE_MESSAGE_TYPE,      "ASAP Registration Response" },
 766   { DEREGISTRATION_RESPONSE_MESSAGE_TYPE,    "ASAP Deregistration Response" },
 767   { HANDLE_RESOLUTION_MESSAGE_TYPE,          "ASAP Handle Resolution" },
 768   { HANDLE_RESOLUTION_RESPONSE_MESSAGE_TYPE, "ASAP Handle Resolution Response" },
 769   { ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE,        "ASAP Endpoint Keep-Alive" },
 770   { ENDPOINT_KEEP_ALIVE_ACK_MESSAGE_TYPE,    "ASAP Endpoint Keep-Alive Acknowledgement" },
 771   { ENDPOINT_UNREACHABLE_MESSAGE_TYPE,       "ASAP Endpoint Unreachable" },
 772   { SERVER_ANNOUNCE_MESSAGE_TYPE,            "ASAP Server Announce" },
 773   { COOKIE_MESSAGE_TYPE,                     "ASAP Cookie" },
 774   { COOKIE_ECHO_MESSAGE_TYPE,                "ASAP Cookie Echo" },
 775   { BUSINESS_CARD_MESSAGE_TYPE,              "ASAP Business Card" },
 776   { ERROR_MESSAGE_TYPE,                      "ASAP Error" },
 777   { 0,                                       NULL } };
 778
 779 #define SERVER_IDENTIFIER_OFFSET MESSAGE_VALUE_OFFSET
 780 #define SERVER_IDENTIFIER_LENGTH 4
 781
 782 #define HOME_ENRP_SERVER_BIT_MASK 0x01
 783 #define REJECT_BIT_MASK           0x01
 784
 785 static const true_false_string home_enrp_server_bit_value = {
 786   "Want to be new ENRP server",
 787   "Do not want to be new ENRP server"
 788 };
 789
 790 static const true_false_string reject_bit_value = {
 791   "Rejected",
 792   "Accepted"
 793 };
 794
 795 static void
 796 dissect_asap_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *asap_tree)
 797 {
 798   tvbuff_t   *parameters_tvb;
 799   proto_item *flags_item;
 800   proto_tree *flags_tree;
 801   guint8      type;
 802
 803
 804   type = tvb_get_guint8(message_tvb, MESSAGE_TYPE_OFFSET);
 805   /* pinfo is NULL only if dissect_asap_message is called via dissect_error_cause */
 806   if (pinfo)
 807    col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(type, message_type_values, "Unknown ASAP type"));
 808
 809   if (asap_tree) {
 810     proto_tree_add_item(asap_tree, hf_message_type,   message_tvb, MESSAGE_TYPE_OFFSET,   MESSAGE_TYPE_LENGTH,   ENC_BIG_ENDIAN);
 811     flags_item = proto_tree_add_item(asap_tree, hf_message_flags,  message_tvb, MESSAGE_FLAGS_OFFSET,  MESSAGE_FLAGS_LENGTH,  ENC_BIG_ENDIAN);
 812     flags_tree = proto_item_add_subtree(flags_item, ett_asap_flags);
 813     if (type == REGISTRATION_RESPONSE_MESSAGE_TYPE) {
 814       proto_tree_add_item(flags_tree, hf_reject_bit, message_tvb, MESSAGE_FLAGS_OFFSET, MESSAGE_FLAGS_LENGTH, ENC_BIG_ENDIAN);
 815     }
 816     if (type == ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE) {
 817       proto_tree_add_item(flags_tree, hf_home_enrp_server_bit, message_tvb, MESSAGE_FLAGS_OFFSET, MESSAGE_FLAGS_LENGTH, ENC_BIG_ENDIAN);
 818     }
 819     proto_tree_add_item(asap_tree, hf_message_length, message_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 820     if ((type == SERVER_ANNOUNCE_MESSAGE_TYPE) || (type == ENDPOINT_KEEP_ALIVE_MESSAGE_TYPE)) {
 821       proto_tree_add_item(asap_tree, hf_server_identifier, message_tvb, SERVER_IDENTIFIER_OFFSET, SERVER_IDENTIFIER_LENGTH, ENC_BIG_ENDIAN);
 822       parameters_tvb = tvb_new_subset_remaining(message_tvb, MESSAGE_VALUE_OFFSET + SERVER_IDENTIFIER_LENGTH);
 823     } else {
 824       parameters_tvb = tvb_new_subset_remaining(message_tvb, MESSAGE_VALUE_OFFSET);
 825     }
 826     dissect_parameters(parameters_tvb, asap_tree);
 827     }
 828 }
 829
 830 static void
 831 dissect_asap(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
 832 {
 833   proto_item *asap_item;
 834   proto_tree *asap_tree;
 835
 836   /* pinfo is NULL only if dissect_asap is called from dissect_error_cause */
 837   if (pinfo)
 838     col_set_str(pinfo->cinfo, COL_PROTOCOL, "ASAP");
 839
 840   /* In the interest of speed, if "tree" is NULL, don't do any work not
 841      necessary to generate protocol tree items. */
 842   if (tree) {
 843     /* create the asap protocol tree */
 844     asap_item = proto_tree_add_item(tree, proto_asap, message_tvb, 0, -1, ENC_NA);
 845     asap_tree = proto_item_add_subtree(asap_item, ett_asap);
 846   } else {
 847     asap_tree = NULL;
 848   };
 849   /* dissect the message */
 850   dissect_asap_message(message_tvb, pinfo, asap_tree);
 851 }
 852
 853 /* Register the protocol with Wireshark */
 854 void
 855 proto_register_asap(void)
 856 {
 857
 858   /* Setup list of header fields */
 859   static hf_register_info hf[] = {
 860     { &hf_message_type,           { "Type",                        "asap.message_type",                             FT_UINT8,   BASE_DEC,  VALS(message_type_values),        0x0,                       NULL, HFILL } },
 861     { &hf_message_flags,          { "Flags",                       "asap.message_flags",                            FT_UINT8,   BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 862     { &hf_message_length,         { "Length",                      "asap.message_length",                           FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 863     { &hf_cause_code,             { "Cause Code",                  "asap.cause_code",                               FT_UINT16,  BASE_HEX,  VALS(cause_code_values),          0x0,                       NULL, HFILL } },
 864     { &hf_cause_length,           { "Cause Length",                "asap.cause_length",                             FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 865     { &hf_cause_info,             { "Cause Info",                  "asap.cause_info",                               FT_BYTES,   BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 866     { &hf_cause_padding,          { "Padding",                     "asap.cause_padding",                            FT_BYTES,   BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 867     { &hf_parameter_type,         { "Parameter Type",              "asap.parameter_type",                           FT_UINT16,  BASE_HEX,  VALS(parameter_type_values),      0x0,                       NULL, HFILL } },
 868     { &hf_parameter_length,       { "Parameter Length",            "asap.parameter_length",                         FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 869     { &hf_parameter_value,        { "Parameter Value",             "asap.parameter_value",                          FT_BYTES,   BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 870     { &hf_parameter_padding,      { "Padding",                     "asap.parameter_padding",                        FT_BYTES,   BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 871     { &hf_parameter_ipv4_address, { "IP Version 4 Address",        "asap.ipv4_address",                             FT_IPv4,    BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 872     { &hf_parameter_ipv6_address, { "IP Version 6 Address",        "asap.ipv6_address",                             FT_IPv6,    BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 873     { &hf_dccp_port,              { "Port",                        "asap.dccp_transport_port",                      FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 874     { &hf_dccp_reserved,          { "Reserved",                    "asap.dccp_transport_reserved",                  FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 875     { &hf_dccp_service_code,      { "Service Code",                "asap.dccp_transport_service_code",              FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 876     { &hf_sctp_port,              { "Port",                        "asap.sctp_transport_port",                      FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 877     { &hf_transport_use,          { "Transport Use",               "asap.transport_use",                            FT_UINT16,  BASE_DEC,  VALS(transport_use_values),       0x0,                       NULL, HFILL } },
 878     { &hf_tcp_port,               { "Port",                        "asap.tcp_transport_port",                       FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 879     { &hf_udp_port,               { "Port",                        "asap.udp_transport_port",                       FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 880     { &hf_udp_reserved,           { "Reserved",                    "asap.udp_transport_reserved",                   FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 881     { &hf_udp_lite_port,          { "Port",                        "asap.udp_lite_transport_port",                  FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 882     { &hf_udp_lite_reserved,      { "Reserved",                    "asap.udp_lite_transport_reserved",              FT_UINT16,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 883     { &hf_policy_type,            { "Policy Type",                 "asap.pool_member_selection_policy_type",        FT_UINT32,  BASE_HEX,  VALS(policy_type_values),         0x0,                       NULL, HFILL } },
 884     { &hf_policy_weight,          { "Policy Weight",               "asap.pool_member_selection_policy_weight",      FT_UINT32,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 885     { &hf_policy_priority,        { "Policy Priority",             "asap.pool_member_selection_policy_priority",    FT_UINT32,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 886     { &hf_policy_load,            { "Policy Load",                 "asap.pool_member_selection_policy_load",        FT_DOUBLE,  BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 887     { &hf_policy_degradation,     { "Policy Degradation",          "asap.pool_member_selection_policy_degradation", FT_DOUBLE,  BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 888     { &hf_policy_loaddpf,         { "Policy Load DPF",             "asap.pool_member_selection_policy_load_dpf",    FT_DOUBLE,  BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 889     { &hf_policy_weightdpf,       { "Policy Weight DPF",           "asap.pool_member_selection_policy_weight_dpf",  FT_DOUBLE,  BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 890     { &hf_policy_distance,        { "Policy Distance",             "asap.pool_member_selection_policy_distance",    FT_UINT32,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 891     { &hf_policy_value,           { "Policy Value",                "asap.pool_member_selection_policy_value",       FT_BYTES,   BASE_NONE, NULL,                             0x0,                       NULL, HFILL } },
 892     { &hf_pool_handle,            { "Pool Handle",                 "asap.pool_handle_pool_handle",                  FT_BYTES,   BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 893     { &hf_pe_pe_identifier,       { "PE Identifier",               "asap.pool_element_pe_identifier",               FT_UINT32,  BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 894     { &hf_home_enrp_id,           { "Home ENRP Server Identifier", "asap.pool_element_home_enrp_server_identifier", FT_UINT32,  BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 895     { &hf_reg_life,               { "Registration Life",           "asap.pool_element_registration_life",           FT_INT32,   BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 896     { &hf_cookie,                 { "Cookie",                      "asap.cookie",                                   FT_BYTES,   BASE_NONE,  NULL,                             0x0,                       NULL, HFILL } },
 897     { &hf_pe_identifier,          { "PE Identifier",               "asap.pe_identifier",                            FT_UINT32,  BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 898     { &hf_pe_checksum,            { "PE Checksum",                 "asap.pe_checksum",                              FT_UINT32,  BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 899     { &hf_hropt_items,            { "Items",                       "asap.hropt_items",                              FT_UINT32,  BASE_DEC,  NULL,                             0x0,                       NULL, HFILL } },
 900     { &hf_server_identifier,      { "Server Identifier",           "asap.server_identifier",                        FT_UINT32,  BASE_HEX,  NULL,                             0x0,                       NULL, HFILL } },
 901     { &hf_home_enrp_server_bit,   { "H Bit",                       "asap.h_bit",                                    FT_BOOLEAN, 8,         TFS(&home_enrp_server_bit_value), HOME_ENRP_SERVER_BIT_MASK, NULL, HFILL } },
 902     { &hf_reject_bit,             { "R Bit",                       "asap.r_bit",                                    FT_BOOLEAN, 8,         TFS(&reject_bit_value),           REJECT_BIT_MASK,           NULL, HFILL } },
 903   };
 904
 905   /* Setup protocol subtree array */
 906   static gint *ett[] = {
 907     &ett_asap,
 908     &ett_asap_flags,
 909     &ett_asap_parameter,
 910     &ett_asap_cause,
 911   };
 912
 913   /* Register the protocol name and description */
 914   proto_asap = proto_register_protocol("Aggregate Server Access Protocol", "ASAP",  "asap");
 915
 916   /* Required function calls to register the header fields and subtrees used */
 917   proto_register_field_array(proto_asap, hf, array_length(hf));
 918   proto_register_subtree_array(ett, array_length(ett));
 919
 920 }
 921
 922 void
 923 proto_reg_handoff_asap(void)
 924 {
 925   dissector_handle_t asap_handle;
 926
 927   asap_handle = create_dissector_handle(dissect_asap, proto_asap);
 928   dissector_add_uint("sctp.ppi",  ASAP_PAYLOAD_PROTOCOL_ID, asap_handle);
 929   dissector_add_uint("udp.port",  ASAP_UDP_PORT,  asap_handle);
 930   dissector_add_uint("tcp.port",  ASAP_TCP_PORT,  asap_handle);
 931   dissector_add_uint("sctp.port", ASAP_SCTP_PORT, asap_handle);
 932 }