epan/dissectors/packet-rtcdc.c

   1 /*
   2  * packet-rtcdc.c
   3  * Routines for the RTCWeb Data Channel Protocol dissection
   4  * as specified in
   5  * http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-03
   6  * and the upcoming version specified in
   7  * http://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-00
   8  * We might want to remove the support of
   9  * http://tools.ietf.org/html/draft-jesup-rtcweb-data-protocol-03
  10  * in the future, but I'll leave it in for now.
  11  * Copyright 2012 - 2013, Michael Tuexen <tuexen@wireshark.org>
  12  *
  13  * $Id$
  14  *
  15  * Wireshark - Network traffic analyzer
  16  * By Gerald Combs <gerald@wireshark.org>
  17  * Copyright 1998 Gerald Combs
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License along
  30  * with this program; if not, write to the Free Software Foundation, Inc.,
  31  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  32  */
  33
  34 #include "config.h"
  35
  36 #include <glib.h>
  37
  38 #include <epan/expert.h>
  39 #include <epan/packet.h>
  40 #include <epan/prefs.h>
  41 #include <epan/sctpppids.h>
  42
  43 void proto_reg_handoff_rtcdc(void);
  44
  45 /* PPID used for this protocol */
  46 static guint32 rtcdc_ppid = WEBRTC_CONTROL_PAYLOAD_PROTOCOL_ID;
  47
  48 /* Initialize the protocol and registered fields */
  49 static int proto_rtcdc = -1;
  50 static int hf_message_type = -1;
  51 static int hf_channel_type = -1;
  52 static int hf_flags = -1;
  53 static int hf_flags_reserved = -1;
  54 static int hf_unordered_allowed = -1;
  55 static int hf_reliability = -1;
  56 static int hf_priority = -1;
  57 static int hf_label = -1;
  58 static int hf_error = -1;
  59 static int hf_sid = -1;
  60 static int hf_new_channel_type = -1;
  61 static int hf_new_reliability = -1;
  62 static int hf_new_priority = -1;
  63 static int hf_new_label_length = -1;
  64 static int hf_new_protocol_length = -1;
  65 static int hf_new_label = -1;
  66 static int hf_new_protocol = -1;
  67
  68 /* Initialize the subtree pointers */
  69 static gint ett_rtcdc = -1;
  70 static gint ett_flags = -1;
  71
  72 static expert_field ei_rtcdc_new_reliability_non_zero = EI_INIT;
  73 static expert_field ei_rtcdc_message_type_unknown = EI_INIT;
  74 static expert_field ei_rtcdc_inconsistent_label_and_parameter_length = EI_INIT;
  75 static expert_field ei_rtcdc_message_too_long = EI_INIT;
  76 static expert_field ei_rtcdc_new_channel_type = EI_INIT;
  77
  78 #define DATA_CHANNEL_OPEN_REQUEST     0x00
  79 #define DATA_CHANNEL_OPEN_RESPONSE    0x01
  80 #define DATA_CHANNEL_ACK              0x02
  81 #define DATA_CHANNEL_NEW_OPEN_REQUEST 0x03
  82
  83 static const value_string message_type_values[] = {
  84         { DATA_CHANNEL_OPEN_REQUEST,     "DATA_CHANNEL_OPEN_REQUEST"  },
  85         { DATA_CHANNEL_OPEN_RESPONSE,    "DATA_CHANNEL_OPEN_RESPONSE" },
  86         { DATA_CHANNEL_ACK,              "DATA_CHANNEL_ACK"           },
  87         { DATA_CHANNEL_NEW_OPEN_REQUEST, "DATA_CHANNEL_OPEN_REQUEST"  },
  88         { 0,                             NULL                         }
  89 };
  90
  91 #define DATA_CHANNEL_RELIABLE                0x00
  92 #define DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT 0x01
  93 #define DATA_CHANNEL_PARTIAL_RELIABLE_TIMED  0x02
  94
  95 static const value_string channel_type_values[] = {
  96         { DATA_CHANNEL_RELIABLE,                "DATA_CHANNEL_RELIABLE"                },
  97         { DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT, "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT" },
  98         { DATA_CHANNEL_PARTIAL_RELIABLE_TIMED,  "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED"  },
  99         { 0,                                    NULL                                   }
 100 };
 101
 102 #define MESSAGE_TYPE_LENGTH 1
 103 #define CHANNEL_TYPE_LENGTH 1
 104 #define FLAGS_LENGTH        2
 105 #define RELIABILITY_LENGTH  2
 106 #define PRIORITY_LENGTH     2
 107
 108 #define MESSAGE_TYPE_OFFSET 0
 109 #define CHANNEL_TYPE_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
 110 #define FLAGS_OFFSET        (CHANNEL_TYPE_OFFSET + CHANNEL_TYPE_LENGTH)
 111 #define RELIABILITY_OFFSET  (FLAGS_OFFSET + FLAGS_LENGTH)
 112 #define PRIORITY_OFFSET     (RELIABILITY_OFFSET + RELIABILITY_LENGTH)
 113 #define LABEL_OFFSET        (PRIORITY_OFFSET + PRIORITY_LENGTH)
 114
 115 #define DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED_MASK 0x0001
 116 #define DATA_CHANNEL_FLAG_RESERVED_MASK             0xFFFE
 117
 118 static void
 119 dissect_open_request_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *rtcdc_tree, proto_item *rtcdc_item _U_)
 120 {
 121         if (rtcdc_tree) {
 122                 proto_tree *flags_tree;
 123                 proto_item *flags_item;
 124
 125                 proto_tree_add_item(rtcdc_tree, hf_channel_type, tvb, CHANNEL_TYPE_OFFSET, CHANNEL_TYPE_LENGTH, ENC_BIG_ENDIAN);
 126                 flags_item = proto_tree_add_item(rtcdc_tree, hf_flags, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
 127                 flags_tree = proto_item_add_subtree(flags_item, ett_flags);
 128                 proto_tree_add_item(flags_tree, hf_flags_reserved, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
 129                 proto_tree_add_item(flags_tree, hf_unordered_allowed, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
 130                 proto_tree_add_item(rtcdc_tree, hf_reliability, tvb, RELIABILITY_OFFSET, RELIABILITY_LENGTH, ENC_BIG_ENDIAN);
 131                 proto_tree_add_item(rtcdc_tree, hf_priority, tvb, PRIORITY_OFFSET, PRIORITY_LENGTH, ENC_BIG_ENDIAN);
 132                 proto_tree_add_item(rtcdc_tree, hf_label, tvb, LABEL_OFFSET, -1, ENC_BIG_ENDIAN);
 133         }
 134         return;
 135 }
 136
 137 #define ERROR_LENGTH                 1
 138 #define SID_LENGTH                   2
 139 #define DATA_CHANNEL_RESPONSE_LENGTH (MESSAGE_TYPE_LENGTH + ERROR_LENGTH + FLAGS_LENGTH + SID_LENGTH)
 140
 141 #define ERROR_OFFSET                 (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
 142 #define SID_OFFSET                   (FLAGS_OFFSET + FLAGS_LENGTH)
 143
 144 static void
 145 dissect_open_response_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree, proto_item *rtcdc_item)
 146 {
 147         if (tvb_length(tvb) > DATA_CHANNEL_RESPONSE_LENGTH) {
 148                 expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_message_too_long);
 149         }
 150         if (rtcdc_tree) {
 151                 proto_tree_add_item(rtcdc_tree, hf_error, tvb, ERROR_OFFSET, ERROR_LENGTH, ENC_BIG_ENDIAN);
 152                 proto_tree_add_item(rtcdc_tree, hf_flags, tvb, FLAGS_OFFSET, FLAGS_LENGTH, ENC_BIG_ENDIAN);
 153                 proto_tree_add_item(rtcdc_tree, hf_sid, tvb, SID_OFFSET, SID_LENGTH, ENC_BIG_ENDIAN);
 154         }
 155         return;
 156 }
 157
 158 #define DATA_CHANNEL_ACK_LENGTH MESSAGE_TYPE_LENGTH
 159
 160 static void
 161 dissect_open_ack_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree _U_, proto_item *rtcdc_item)
 162 {
 163         if (tvb_length(tvb) > DATA_CHANNEL_ACK_LENGTH) {
 164                 expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_message_too_long);
 165         }
 166         return;
 167 }
 168
 169 #define NEW_DATA_CHANNEL_RELIABLE                          0x00
 170 #define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT           0x01
 171 #define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED            0x02
 172 #define NEW_DATA_CHANNEL_RELIABLE_UNORDERED                0x80
 173 #define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED 0x81
 174 #define NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED  0x82
 175
 176 static const value_string new_channel_type_values[] = {
 177         { NEW_DATA_CHANNEL_RELIABLE,                          "DATA_CHANNEL_RELIABLE"                          },
 178         { NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT,           "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT"           },
 179         { NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED,            "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED"            },
 180         { NEW_DATA_CHANNEL_RELIABLE_UNORDERED,                "DATA_CHANNEL_RELIABLE_UNORDERED"                },
 181         { NEW_DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED, "DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED" },
 182         { NEW_DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED,  "DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED"  },
 183         { 0,                                                  NULL                                             }
 184 };
 185
 186 #define NEW_MESSAGE_TYPE_LENGTH    1
 187 #define NEW_CHANNEL_TYPE_LENGTH    1
 188 #define NEW_PRIORITY_LENGTH        2
 189 #define NEW_RELIABILITY_LENGTH     4
 190 #define NEW_LABEL_LENGTH_LENGTH    2
 191 #define NEW_PROTOCOL_LENGTH_LENGTH 2
 192 #define NEW_OPEN_REQUEST_HEADER_LENGTH (guint)(NEW_MESSAGE_TYPE_LENGTH + \
 193                                                NEW_CHANNEL_TYPE_LENGTH + \
 194                                                NEW_PRIORITY_LENGTH + \
 195                                                NEW_RELIABILITY_LENGTH + \
 196                                                NEW_LABEL_LENGTH_LENGTH + \
 197                                                NEW_PROTOCOL_LENGTH_LENGTH)
 198
 199 #define NEW_MESSAGE_TYPE_OFFSET    0
 200 #define NEW_CHANNEL_TYPE_OFFSET    (NEW_MESSAGE_TYPE_OFFSET + NEW_MESSAGE_TYPE_LENGTH)
 201 #define NEW_PRIORITY_OFFSET        (NEW_CHANNEL_TYPE_OFFSET + NEW_CHANNEL_TYPE_LENGTH)
 202 #define NEW_RELIABILITY_OFFSET     (NEW_PRIORITY_OFFSET + NEW_PRIORITY_LENGTH)
 203 #define NEW_LABEL_LENGTH_OFFSET    (NEW_RELIABILITY_OFFSET + NEW_RELIABILITY_LENGTH)
 204 #define NEW_PROTOCOL_LENGTH_OFFSET (NEW_LABEL_LENGTH_OFFSET + NEW_LABEL_LENGTH_LENGTH)
 205 #define NEW_LABEL_OFFSET           (NEW_PROTOCOL_LENGTH_OFFSET + NEW_PROTOCOL_LENGTH_LENGTH)
 206
 207 static void
 208 dissect_new_open_request_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *rtcdc_tree, proto_item *rtcdc_item)
 209 {
 210         if (rtcdc_tree) {
 211                 guint8 channel_type;
 212                 guint32 reliability;
 213                 guint16 label_length;
 214                 guint16 protocol_length;
 215
 216                 proto_tree_add_item(rtcdc_tree, hf_new_channel_type, tvb, NEW_CHANNEL_TYPE_OFFSET, NEW_CHANNEL_TYPE_LENGTH, ENC_BIG_ENDIAN);
 217                 channel_type = tvb_get_guint8(tvb, NEW_CHANNEL_TYPE_OFFSET);
 218                 if ((channel_type & 0x7f) > 0x02) {
 219                         expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_new_channel_type);
 220                 }
 221                 proto_tree_add_item(rtcdc_tree, hf_new_priority, tvb, NEW_PRIORITY_OFFSET, NEW_PRIORITY_LENGTH, ENC_BIG_ENDIAN);
 222                 proto_tree_add_item(rtcdc_tree, hf_new_reliability, tvb, NEW_RELIABILITY_OFFSET, NEW_RELIABILITY_LENGTH, ENC_BIG_ENDIAN);
 223                 reliability = tvb_get_ntohl(tvb, NEW_RELIABILITY_OFFSET);
 224                 if ((reliability > 0) && ((channel_type & 0x80) == 0)) {
 225                         expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_new_reliability_non_zero);
 226                 }
 227                 proto_tree_add_item(rtcdc_tree, hf_new_label_length, tvb, NEW_LABEL_LENGTH_OFFSET, NEW_LABEL_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 228                 proto_tree_add_item(rtcdc_tree, hf_new_protocol_length, tvb, NEW_PROTOCOL_LENGTH_OFFSET, NEW_PROTOCOL_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 229                 label_length = tvb_get_ntohs(tvb, NEW_LABEL_LENGTH_OFFSET);
 230                 protocol_length = tvb_get_ntohs(tvb, NEW_PROTOCOL_LENGTH_OFFSET);
 231                 if (NEW_OPEN_REQUEST_HEADER_LENGTH + (guint)label_length + (guint)protocol_length != tvb_length(tvb)) {
 232                         expert_add_info(pinfo, rtcdc_item, &ei_rtcdc_inconsistent_label_and_parameter_length);
 233                 }
 234                 proto_tree_add_item(rtcdc_tree, hf_new_label, tvb, NEW_LABEL_OFFSET, label_length, ENC_BIG_ENDIAN);
 235                 proto_tree_add_item(rtcdc_tree, hf_new_protocol, tvb, NEW_LABEL_OFFSET + label_length, protocol_length, ENC_BIG_ENDIAN);
 236         }
 237         return;
 238 }
 239
 240 static int
 241 dissect_rtcdc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
 242 {
 243         proto_item *rtcdc_item, *msg_item;
 244         proto_tree *rtcdc_tree;
 245         guint8 message_type;
 246
 247         message_type  = tvb_get_guint8(tvb, MESSAGE_TYPE_OFFSET);
 248
 249         col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTCDC");
 250         col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_type, message_type_values, "reserved"));
 251         rtcdc_item = proto_tree_add_item(tree, proto_rtcdc, tvb, 0, -1, ENC_NA);
 252         rtcdc_tree = proto_item_add_subtree(rtcdc_item, ett_rtcdc);
 253         msg_item = proto_tree_add_item(rtcdc_tree, hf_message_type, tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH, ENC_BIG_ENDIAN);
 254
 255     switch (message_type) {
 256         case DATA_CHANNEL_OPEN_REQUEST:
 257                 dissect_open_request_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
 258                 break;
 259         case DATA_CHANNEL_OPEN_RESPONSE:
 260                 dissect_open_response_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
 261                 break;
 262         case DATA_CHANNEL_ACK:
 263                 dissect_open_ack_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
 264                 break;
 265         case DATA_CHANNEL_NEW_OPEN_REQUEST:
 266                 dissect_new_open_request_message(tvb, pinfo, rtcdc_tree, rtcdc_item);
 267                 break;
 268         default:
 269                 expert_add_info(pinfo, msg_item, &ei_rtcdc_message_type_unknown);
 270                 break;
 271         }
 272         return tvb_length(tvb);
 273 }
 274
 275 void
 276 proto_register_rtcdc(void)
 277 {
 278         module_t *rtcdc_module;
 279         expert_module_t* expert_rtcdc;
 280         static hf_register_info hf[] = {
 281                 { &hf_message_type,        { "Message type",              "rtcdc.message_type",            FT_UINT8,   BASE_DEC,  VALS(message_type_values),     0x0,                                         NULL, HFILL } },
 282                 { &hf_channel_type,        { "Channel type",              "rtcdc.channel_type",            FT_UINT8,   BASE_DEC,  VALS(channel_type_values),     0x0,                                         NULL, HFILL } },
 283                 { &hf_flags,               { "Flags",                     "rtcdc.flags",                   FT_UINT16,  BASE_HEX,  NULL,                          0x0,                                         NULL, HFILL } },
 284                 { &hf_flags_reserved,      { "Reserved",                  "rtcdc.flags_reserved",          FT_UINT16,  BASE_HEX,  NULL,                          DATA_CHANNEL_FLAG_RESERVED_MASK,             NULL, HFILL } },
 285                 { &hf_unordered_allowed,   { "Unordered allowed",         "rtcdc.flags_unordered_allowed", FT_BOOLEAN, 16,        NULL,                          DATA_CHANNEL_FLAG_OUT_OF_ORDER_ALLOWED_MASK, NULL, HFILL } },
 286                 { &hf_reliability,         { "Reliability parameter",     "rtcdc.reliability_parameter",   FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 287                 { &hf_priority,            { "Priority",                  "rtcdc.priority",                FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 288                 { &hf_label,               { "Label",                     "rtcdc.label",                   FT_STRING,  BASE_NONE, NULL,                          0x0,                                         NULL, HFILL } },
 289                 { &hf_error,               { "Error",                     "rtcdc.error",                   FT_UINT8,   BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 290                 { &hf_sid,                 { "Reverse stream identifier", "rtcdc.reverse_stream_id",       FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 291                 { &hf_new_channel_type,    { "Channel type",              "rtcdc.channel_type",            FT_UINT8,   BASE_DEC,  VALS(new_channel_type_values), 0x0,                                         NULL, HFILL } },
 292                 { &hf_new_reliability,     { "Reliability parameter",     "rtcdc.reliability_parameter",   FT_UINT32,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 293                 { &hf_new_priority,        { "Priority",                  "rtcdc.priority",                FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 294                 { &hf_new_label_length,    { "Label length",              "rtcdc.label_length",            FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 295                 { &hf_new_protocol_length, { "Protocol length",           "rtcdc.protocol_length",         FT_UINT16,  BASE_DEC,  NULL,                          0x0,                                         NULL, HFILL } },
 296                 { &hf_new_label,           { "Label",                     "rtcdc.label",                   FT_STRING,  BASE_NONE, NULL,                          0x0,                                         NULL, HFILL } },
 297                 { &hf_new_protocol,        { "Protocol",                  "rtcdc.protocol",                FT_STRING,  BASE_NONE, NULL,                          0x0,                                         NULL, HFILL } }
 298         };
 299         static gint *ett[] = {
 300                 &ett_rtcdc,
 301                 &ett_flags
 302         };
 303
 304         static ei_register_info ei[] = {
 305                 { &ei_rtcdc_message_too_long, { "rtcdc.message_too_long", PI_MALFORMED, PI_ERROR, "Message too long", EXPFILL }},
 306                 { &ei_rtcdc_new_channel_type, { "rtcdc.channel_type.unknown", PI_PROTOCOL, PI_WARN, "Unknown channel type", EXPFILL }},
 307                 { &ei_rtcdc_new_reliability_non_zero, { "rtcdc.reliability_parameter.non_zero", PI_PROTOCOL, PI_WARN, "Reliability parameter non zero for reliable channel", EXPFILL }},
 308                 { &ei_rtcdc_inconsistent_label_and_parameter_length, { "rtcdc.inconsistent_label_and_parameter_length", PI_MALFORMED, PI_ERROR, "Inconsistent label and parameter length", EXPFILL }},
 309                 { &ei_rtcdc_message_type_unknown, { "rtcdc.message_type.unknown", PI_PROTOCOL, PI_WARN, "Unknown message type", EXPFILL }},
 310         };
 311
 312         proto_rtcdc = proto_register_protocol("WebRTC Datachannel Protocol", "RTCDC", "rtcdc");
 313         proto_register_field_array(proto_rtcdc, hf, array_length(hf));
 314         proto_register_subtree_array(ett, array_length(ett));
 315         expert_rtcdc = expert_register_protocol(proto_rtcdc);
 316         expert_register_field_array(expert_rtcdc, ei, array_length(ei));
 317         rtcdc_module = prefs_register_protocol(proto_rtcdc, proto_reg_handoff_rtcdc);
 318         prefs_register_uint_preference(rtcdc_module, "sctp.ppi", "RTCDC SCTP PPID", "RTCDC SCTP PPID if other than the default", 10, &rtcdc_ppid);
 319 }
 320
 321 void
 322 proto_reg_handoff_rtcdc(void)
 323 {
 324         static gboolean initialized = FALSE;
 325         static dissector_handle_t rtcdc_handle;
 326         static guint32 current_ppid;
 327
 328         if (!initialized) {
 329                 rtcdc_handle = new_create_dissector_handle(dissect_rtcdc, proto_rtcdc);
 330                 initialized = TRUE;
 331         } else {
 332                 dissector_delete_uint("sctp.ppi", current_ppid, rtcdc_handle);
 333         }
 334         current_ppid = rtcdc_ppid;
 335         dissector_add_uint("sctp.ppi", current_ppid, rtcdc_handle);
 336 }
 337
 338 /*
 339  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 340  *
 341  * Local variables:
 342  * c-basic-offset: 4
 343  * tab-width: 8
 344  * indent-tabs-mode: nil
 345  * End:
 346  *
 347  * vi: set shiftwidth=4 tabstop=8 expandtab:
 348  * :indentSize=4:tabSize=8:noTabs=true:
 349  */