packet-sccpmg.c

   1 /* packet-sccp.c
   2  * Routines for Signalling Connection Control Part (SCCP) Management dissection
   3  *
   4  * It is hopefully compliant to:
   5  *   ANSI T1.112.3-1996
   6  *   ITU-T Q.713 7/1996
   7  *   YDN 038-1997 (Chinese ITU variant)
   8  *
   9  * Copyright 2002, Jeff Morriss <jeff.morriss[AT]ulticom.com>
  10  *
  11  * $Id: packet-sccpmg.c,v 1.5 2003/04/22 13:47:38 tuexen Exp $
  12  *
  13  * Ethereal - Network traffic analyzer
  14  * By Gerald Combs <gerald@ethereal.com>
  15  * Copyright 1998 Gerald Combs
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version 2
  20  * of the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30  */
  31
  32 #ifdef HAVE_CONFIG_H
  33 # include "config.h"
  34 #endif
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <glib.h>
  41
  42 #ifdef NEED_SNPRINTF_H
  43 #include "snprintf.h"
  44 #endif
  45
  46 #include <epan/packet.h>
  47 #include "packet-mtp3.h"
  48
  49 #define SCCPMG_SSN 1
  50
  51 #define SCCPMG_MESSAGE_TYPE_SSA 0x01
  52 #define SCCPMG_MESSAGE_TYPE_SSP 0x02
  53 #define SCCPMG_MESSAGE_TYPE_SST 0x03
  54 #define SCCPMG_MESSAGE_TYPE_SOR 0x04
  55 #define SCCPMG_MESSAGE_TYPE_SOG 0x05
  56 /* SSC is ITU only */
  57 #define SCCPMG_MESSAGE_TYPE_SSC 0x06
  58 /* Below are ANSI only */
  59 #define SCCPMG_MESSAGE_TYPE_SBR 0xfd
  60 #define SCCPMG_MESSAGE_TYPE_SNR 0xfe
  61 #define SCCPMG_MESSAGE_TYPE_SRT 0xff
  62
  63 /* Same as below but with names typed out */
  64 static const value_string sccpmg_message_type_values[] = {
  65   { SCCPMG_MESSAGE_TYPE_SSA,   "SubSystem Allowed" },
  66   { SCCPMG_MESSAGE_TYPE_SSP,   "SubSystem Prohibited" },
  67   { SCCPMG_MESSAGE_TYPE_SST,   "Subsystem Status Test" },
  68   { SCCPMG_MESSAGE_TYPE_SOR,   "Subsystem Out of service Request" },
  69   { SCCPMG_MESSAGE_TYPE_SOG,   "Subsystem Out of service Grant" },
  70   { SCCPMG_MESSAGE_TYPE_SSC,   "SubSystem Congested (ITU)" },
  71   { SCCPMG_MESSAGE_TYPE_SBR,   "Subsystem Backup Routing (ANSI)" },
  72   { SCCPMG_MESSAGE_TYPE_SNR,   "Subsystem Normal Routing (ANSI)" },
  73   { SCCPMG_MESSAGE_TYPE_SRT,   "Subsystem Routing status Test (ANSI)" },
  74   { 0,                       NULL } };
  75
  76 /* Same as above but in acronym for (for the Info column) */
  77 static const value_string sccpmg_message_type_acro_values[] = {
  78   { SCCPMG_MESSAGE_TYPE_SSA,   "SSA" },
  79   { SCCPMG_MESSAGE_TYPE_SSP,   "SSP" },
  80   { SCCPMG_MESSAGE_TYPE_SST,   "SST" },
  81   { SCCPMG_MESSAGE_TYPE_SOR,   "SOR" },
  82   { SCCPMG_MESSAGE_TYPE_SOG,   "SOG" },
  83   { SCCPMG_MESSAGE_TYPE_SSC,   "SSC" },
  84   { SCCPMG_MESSAGE_TYPE_SBR,   "SBR" },
  85   { SCCPMG_MESSAGE_TYPE_SNR,   "SNR" },
  86   { SCCPMG_MESSAGE_TYPE_SRT,   "SRT" },
  87   { 0,                       NULL } };
  88
  89
  90 #define SCCPMG_MESSAGE_TYPE_OFFSET 0
  91 #define SCCPMG_MESSAGE_TYPE_LENGTH 1
  92
  93 #define SCCPMG_AFFECTED_SSN_OFFSET SCCPMG_MESSAGE_TYPE_LENGTH
  94 #define SCCPMG_AFFECTED_SSN_LENGTH 1
  95
  96 #define SCCPMG_AFFECTED_PC_OFFSET (SCCPMG_AFFECTED_SSN_OFFSET + SCCPMG_AFFECTED_SSN_LENGTH)
  97 #define ITU_SCCPMG_AFFECTED_PC_LENGTH 2
  98 #define ANSI_SCCPMG_AFFECTED_PC_LENGTH 3
  99
 100 #define ITU_SCCPMG_SMI_OFFSET (SCCPMG_AFFECTED_PC_OFFSET + ITU_SCCPMG_AFFECTED_PC_LENGTH)
 101 #define ANSI_SCCPMG_SMI_OFFSET (SCCPMG_AFFECTED_PC_OFFSET + ANSI_SCCPMG_AFFECTED_PC_LENGTH)
 102 #define SCCPMG_SMI_LENGTH 1
 103 #define SCCPMG_SMI_MASK 0x3
 104
 105 #define ITU_SCCPMG_CONGESTION_OFFSET (ITU_SCCPMG_SMI_OFFSET + SCCPMG_SMI_LENGTH)
 106 #define ITU_SCCPMG_CONGESTION_LENGTH 1
 107 #define ITU_SCCPMG_CONGESTION_MASK 0x0f
 108 #define CHINESE_ITU_SCCPMG_CONGESTION_OFFSET (ANSI_SCCPMG_SMI_OFFSET + SCCPMG_SMI_LENGTH)
 109
 110 #define SCCPMG_SSN_LENGTH    1
 111
 112 /* Initialize the protocol and registered fields */
 113 static int proto_sccpmg = -1;
 114 static int hf_sccpmg_message_type = -1;
 115 static int hf_sccpmg_affected_ssn = -1;
 116 static int hf_sccpmg_affected_pc = -1;
 117 static int hf_sccpmg_affected_ansi_pc = -1;
 118 static int hf_sccpmg_affected_chinese_pc = -1;
 119 static int hf_sccpmg_affected_pc_member = -1;
 120 static int hf_sccpmg_affected_pc_cluster = -1;
 121 static int hf_sccpmg_affected_pc_network = -1;
 122 static int hf_sccpmg_smi = -1;
 123 static int hf_sccpmg_congestion_level = -1;
 124
 125 /* Initialize the subtree pointers */
 126 static gint ett_sccpmg = -1;
 127 static gint ett_sccpmg_affected_pc = -1;
 128
 129 static void
 130 dissect_sccpmg_unknown_message(tvbuff_t *message_tvb, proto_tree *sccpmg_tree)
 131 {
 132         guint32 message_length;
 133
 134         message_length = tvb_length(message_tvb);
 135
 136         proto_tree_add_text(sccpmg_tree, message_tvb, 0, message_length,
 137                             "Unknown message (%u byte%s)", message_length,
 138                             plurality(message_length, "", "s"));
 139 }
 140
 141 static void
 142 dissect_sccpmg_affected_ssn(tvbuff_t *tvb, proto_tree *sccpmg_tree)
 143 {
 144         proto_tree_add_item(sccpmg_tree, hf_sccpmg_affected_ssn, tvb,
 145                             SCCPMG_AFFECTED_SSN_OFFSET, SCCPMG_SSN_LENGTH,
 146                             FALSE);
 147 }
 148
 149 static void
 150 dissect_sccpmg_affected_pc(tvbuff_t *tvb, proto_tree *sccpmg_tree)
 151 {
 152         proto_item *pc_item = 0;
 153         proto_tree *pc_tree = 0;
 154         guint32 dpc;
 155         guint8 offset = SCCPMG_AFFECTED_PC_OFFSET;
 156         char pc[ANSI_PC_STRING_LENGTH];
 157
 158         if (mtp3_standard == ITU_STANDARD) {
 159                 proto_tree_add_item(sccpmg_tree, hf_sccpmg_affected_pc, tvb,
 160                                     offset, ITU_PC_LENGTH, TRUE);
 161         } else /* ANSI_STANDARD and CHINESE_ITU_STANDARD */ {
 162                 int *hf_affected_pc;
 163
 164                 if (mtp3_standard == ANSI_STANDARD)
 165                 {
 166                         hf_affected_pc = &hf_sccpmg_affected_ansi_pc;
 167                 } else /* CHINESE_ITU_STANDARD */ {
 168                         hf_affected_pc = &hf_sccpmg_affected_chinese_pc;
 169                 }
 170
 171                 /* create the DPC tree; modified from that in packet-sccp.c */
 172                 dpc = tvb_get_ntoh24(tvb, offset);
 173                 snprintf(pc, sizeof(pc), "%d-%d-%d",
 174                          (dpc & ANSI_NETWORK_MASK),
 175                          ((dpc & ANSI_CLUSTER_MASK) >> 8),
 176                          ((dpc & ANSI_MEMBER_MASK) >> 16));
 177
 178                 pc_item = proto_tree_add_string_format(sccpmg_tree,
 179                                                        *hf_affected_pc,
 180                                                        tvb, offset,
 181                                                        ANSI_PC_LENGTH, pc,
 182                                                        "PC (%s)", pc);
 183
 184                 pc_tree = proto_item_add_subtree(pc_item,
 185                                                  ett_sccpmg_affected_pc);
 186
 187                 proto_tree_add_uint(pc_tree, hf_sccpmg_affected_pc_member, tvb,
 188                                     offset, ANSI_NCM_LENGTH, dpc);
 189                 offset += ANSI_NCM_LENGTH;
 190                 proto_tree_add_uint(pc_tree, hf_sccpmg_affected_pc_cluster, tvb,
 191                                     offset, ANSI_NCM_LENGTH, dpc);
 192                 offset += ANSI_NCM_LENGTH;
 193                 proto_tree_add_uint(pc_tree, hf_sccpmg_affected_pc_network,
 194                                     tvb, offset, ANSI_NCM_LENGTH, dpc);
 195         }
 196 }
 197
 198 static void
 199 dissect_sccpmg_smi(tvbuff_t *tvb, proto_tree *sccpmg_tree)
 200 {
 201         guint8 offset = 0;
 202
 203         if (mtp3_standard == ITU_STANDARD)
 204                 offset = ITU_SCCPMG_SMI_OFFSET;
 205         else /* ANSI_STANDARD and CHINESE_ITU_STANDARD */
 206                 offset = ANSI_SCCPMG_SMI_OFFSET;
 207
 208         proto_tree_add_item(sccpmg_tree, hf_sccpmg_smi, tvb, offset,
 209                             SCCPMG_SMI_LENGTH, FALSE);
 210 }
 211
 212 static void
 213 dissect_sccpmg_congestion_level(tvbuff_t *tvb, proto_tree *sccpmg_tree)
 214 {
 215         guint8 offset = 0;
 216
 217         if (mtp3_standard == CHINESE_ITU_STANDARD)
 218                 offset = CHINESE_ITU_SCCPMG_CONGESTION_OFFSET;
 219         else /* ITU_STANDARD */
 220                 offset = ITU_SCCPMG_CONGESTION_OFFSET;
 221
 222         proto_tree_add_item(sccpmg_tree, hf_sccpmg_congestion_level, tvb,
 223                             offset, ITU_SCCPMG_CONGESTION_LENGTH, FALSE);
 224 }
 225
 226 static void
 227 dissect_sccpmg_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *sccpmg_tree)
 228 {
 229         guint8 message_type;
 230         guint8 offset = 0;
 231
 232         /* Extract the message type;  all other processing is based on this */
 233         message_type   = tvb_get_guint8(tvb, SCCPMG_MESSAGE_TYPE_OFFSET);
 234         offset = SCCPMG_MESSAGE_TYPE_LENGTH;
 235
 236     if (check_col(pinfo->cinfo, COL_INFO))
 237         col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(message_type, sccpmg_message_type_acro_values, "Unknown"));
 238
 239         if (sccpmg_tree) {
 240                 /* add the message type to the protocol tree */
 241                 proto_tree_add_uint(sccpmg_tree, hf_sccpmg_message_type, tvb,
 242                                     SCCPMG_MESSAGE_TYPE_OFFSET,
 243                                     SCCPMG_MESSAGE_TYPE_LENGTH, message_type);
 244         }
 245
 246         switch(message_type) {
 247         case SCCPMG_MESSAGE_TYPE_SBR:
 248         case SCCPMG_MESSAGE_TYPE_SNR:
 249         case SCCPMG_MESSAGE_TYPE_SRT:
 250                 if (mtp3_standard != ANSI_STANDARD)
 251                 {
 252                         dissect_sccpmg_unknown_message(tvb, sccpmg_tree);
 253                         break;
 254                 }
 255                 /* else fallthrough */
 256         case SCCPMG_MESSAGE_TYPE_SSA:
 257         case SCCPMG_MESSAGE_TYPE_SSP:
 258         case SCCPMG_MESSAGE_TYPE_SST:
 259         case SCCPMG_MESSAGE_TYPE_SOR:
 260         case SCCPMG_MESSAGE_TYPE_SOG:
 261                 dissect_sccpmg_affected_ssn(tvb, sccpmg_tree);
 262                 dissect_sccpmg_affected_pc(tvb, sccpmg_tree);
 263                 dissect_sccpmg_smi(tvb, sccpmg_tree);
 264
 265                 break;
 266         case SCCPMG_MESSAGE_TYPE_SSC:
 267                 if (mtp3_standard != ANSI_STANDARD)
 268                 {
 269                         dissect_sccpmg_affected_ssn(tvb, sccpmg_tree);
 270                         dissect_sccpmg_affected_pc(tvb, sccpmg_tree);
 271                         dissect_sccpmg_smi(tvb, sccpmg_tree);
 272                         dissect_sccpmg_congestion_level(tvb, sccpmg_tree);
 273                 }
 274                 /* else fallthrough */
 275
 276         default:
 277                 dissect_sccpmg_unknown_message(tvb, sccpmg_tree);
 278         }
 279 }
 280
 281 static void
 282 dissect_sccpmg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 283 {
 284         proto_item *sccpmg_item;
 285         proto_tree *sccpmg_tree = NULL;
 286
 287         /* Make entry in the Protocol column on summary display */
 288         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 289                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "SCCPMG");
 290
 291         /* In the interest of speed, if "tree" is NULL, don't do any work not
 292            necessary to generate protocol tree items. */
 293         if (tree) {
 294                 /* create the sccpmg protocol tree */
 295                 sccpmg_item = proto_tree_add_item(tree, proto_sccpmg, tvb, 0,
 296                                                   -1, FALSE);
 297                 sccpmg_tree = proto_item_add_subtree(sccpmg_item, ett_sccpmg);
 298         }
 299
 300         /* dissect the message */
 301         dissect_sccpmg_message(tvb, pinfo, sccpmg_tree);
 302 }
 303
 304 /* Register the protocol with Ethereal */
 305 void
 306 proto_register_sccpmg(void)
 307 {
 308         /* Setup list of header fields */
 309         static hf_register_info hf[] = {
 310           { &hf_sccpmg_message_type,
 311             { "Message Type", "sccpmg.message_type",
 312               FT_UINT8, BASE_HEX, VALS(sccpmg_message_type_values), 0x0,
 313               "", HFILL}},
 314           { &hf_sccpmg_affected_ssn,
 315             { "Affected SubSystem Number", "sccpmg.ssn",
 316               FT_UINT8, BASE_DEC, NULL, 0x0,
 317               "", HFILL}},
 318           { &hf_sccpmg_affected_pc,
 319             { "Affected Point Code", "sccpmg.pc",
 320               FT_UINT16, BASE_DEC, NULL, ITU_PC_MASK,
 321               "", HFILL}},
 322           { &hf_sccpmg_affected_ansi_pc,
 323             { "Affected Point Code", "sccpmg.ansi_pc",
 324               FT_STRING, BASE_NONE, NULL, 0x0,
 325               "", HFILL}},
 326           { &hf_sccpmg_affected_chinese_pc,
 327             { "Affected Point Code", "sccpmg.chinese_pc",
 328               FT_STRING, BASE_NONE, NULL, 0x0,
 329               "", HFILL}},
 330           { &hf_sccpmg_affected_pc_network,
 331             { "Affected PC Network", "sccpmg.network",
 332               FT_UINT24, BASE_DEC, NULL, ANSI_NETWORK_MASK,
 333               "", HFILL}},
 334           { &hf_sccpmg_affected_pc_cluster,
 335             { "Affected PC Cluster", "sccpmg.cluster",
 336               FT_UINT24, BASE_DEC, NULL, ANSI_CLUSTER_MASK,
 337               "", HFILL}},
 338           { &hf_sccpmg_affected_pc_member,
 339             { "Affected PC Member", "sccpmg.member",
 340               FT_UINT24, BASE_DEC, NULL, ANSI_MEMBER_MASK,
 341               "", HFILL}},
 342           { &hf_sccpmg_smi,
 343             { "Subsystem Multiplicity Indicator", "sccpmg.smi",
 344               FT_UINT8, BASE_DEC, NULL, SCCPMG_SMI_MASK,
 345               "", HFILL}},
 346           { &hf_sccpmg_congestion_level,
 347             { "SCCP Congestionl Level (ITU)", "sccpmg.congestion",
 348               FT_UINT8, BASE_DEC, NULL, ITU_SCCPMG_CONGESTION_MASK,
 349               "", HFILL}}
 350         };
 351
 352         /* Setup protocol subtree array */
 353         static gint *ett[] = {
 354                 &ett_sccpmg,
 355                 &ett_sccpmg_affected_pc
 356         };
 357
 358         /* Register the protocol name and description */
 359         proto_sccpmg = proto_register_protocol("Signalling Connection Control Part Management",
 360                                                "SCCPMG", "sccpmg");
 361
 362         /* Required function calls to register the header fields and subtrees
 363            used */
 364         proto_register_field_array(proto_sccpmg, hf, array_length(hf));
 365         proto_register_subtree_array(ett, array_length(ett));
 366 }
 367
 368 void
 369 proto_reg_handoff_sccpmg(void)
 370 {
 371         dissector_handle_t sccpmg_handle;
 372
 373         sccpmg_handle = create_dissector_handle(dissect_sccpmg, proto_sccpmg);
 374
 375         /* Register for SCCP SSN=1 messages */
 376         dissector_add("sccp.ssn", SCCPMG_SSN, sccpmg_handle);
 377 }
 378