epan/dissectors/packet-rtp.c

   1 /* packet-rtp.c
   2  *
   3  * Routines for RTP dissection
   4  * RTP = Real time Transport Protocol
   5  *
   6  * Copyright 2000, Philips Electronics N.V.
   7  * Written by Andreas Sikkema <h323@ramdyne.nl>
   8  *
   9  * $Id$
  10  *
  11  * Wireshark - Network traffic analyzer
  12  * By Gerald Combs <gerald@wireshark.org>
  13  * Copyright 1998 Gerald Combs
  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 /*
  31  * This dissector tries to dissect the RTP protocol according to Annex A
  32  * of ITU-T Recommendation H.225.0 (02/98) or RFC 1889
  33  *
  34  * RTP traffic is handled by an even UDP portnumber. This can be any
  35  * port number, but there is a registered port available, port 5004
  36  * See Annex B of ITU-T Recommendation H.225.0, section B.7
  37  *
  38  * This doesn't dissect older versions of RTP, such as:
  39  *
  40  *    the vat protocol ("version 0") - see
  41  *
  42  *      ftp://ftp.ee.lbl.gov/conferencing/vat/alpha-test/vatsrc-4.0b2.tar.gz
  43  *
  44  *    and look in "session-vat.cc" if you want to write a dissector
  45  *    (have fun - there aren't any nice header files showing the packet
  46  *    format);
  47  *
  48  *    version 1, as documented in
  49  *
  50  *      ftp://gaia.cs.umass.edu/pub/hgschulz/rtp/draft-ietf-avt-rtp-04.txt
  51  *
  52  * It also dissects PacketCable CCC-encapsulated RTP data, as described in
  53  * chapter 5 of the PacketCable Electronic Surveillance Specification:
  54  *
  55  *   http://www.packetcable.com/downloads/specs/PKT-SP-ESP1.5-I01-050128.pdf
  56  */
  57
  58
  59 #ifdef HAVE_CONFIG_H
  60 # include "config.h"
  61 #endif
  62
  63 #include <glib.h>
  64 #include <epan/packet.h>
  65
  66 #include <stdio.h>
  67 #include <string.h>
  68
  69 #include "packet-rtp.h"
  70 #include <epan/rtp_pt.h>
  71 #include "packet-ntp.h"
  72 #include <epan/conversation.h>
  73 #include <epan/reassemble.h>
  74 #include <epan/tap.h>
  75
  76 #include <epan/prefs.h>
  77 #include <epan/emem.h>
  78
  79 #include "log.h"
  80
  81 /* uncomment this to enable debugging of fragment reassembly */
  82 /* #define DEBUG_FRAGMENTS   1 */
  83
  84 typedef struct _rfc2198_hdr {
  85   unsigned int pt;
  86   int offset;
  87   int len;
  88   struct _rfc2198_hdr *next;
  89 } rfc2198_hdr;
  90
  91 /* we have one of these for each pdu which spans more than one segment
  92  */
  93 typedef struct _rtp_multisegment_pdu {
  94         /* the seqno of the segment where the pdu starts */
  95         guint32 startseq;
  96
  97         /* the seqno of the segment where the pdu ends */
  98         guint32 endseq;
  99 } rtp_multisegment_pdu;
 100
 101 typedef struct  _rtp_private_conv_info {
 102         /* This tree is indexed by sequence number and keeps track of all
 103          * all pdus spanning multiple segments for this flow.
 104          */
 105         emem_tree_t *multisegment_pdus;
 106 } rtp_private_conv_info;
 107
 108 static GHashTable *fragment_table = NULL;
 109 static GHashTable * fid_table = NULL;
 110
 111 static int hf_rtp_fragments = -1;
 112 static int hf_rtp_fragment = -1;
 113 static int hf_rtp_fragment_overlap = -1;
 114 static int hf_rtp_fragment_overlap_conflict = -1;
 115 static int hf_rtp_fragment_multiple_tails = -1;
 116 static int hf_rtp_fragment_too_long_fragment = -1;
 117 static int hf_rtp_fragment_error = -1;
 118 static int hf_rtp_reassembled_in = -1;
 119
 120 static gint ett_rtp_fragment = -1;
 121 static gint ett_rtp_fragments = -1;
 122
 123 static const fragment_items rtp_fragment_items = {
 124   &ett_rtp_fragment,
 125   &ett_rtp_fragments,
 126   &hf_rtp_fragments,
 127   &hf_rtp_fragment,
 128   &hf_rtp_fragment_overlap,
 129   &hf_rtp_fragment_overlap_conflict,
 130   &hf_rtp_fragment_multiple_tails,
 131   &hf_rtp_fragment_too_long_fragment,
 132   &hf_rtp_fragment_error,
 133   &hf_rtp_reassembled_in,
 134   "RTP fragments"
 135 };
 136
 137 static dissector_handle_t rtp_handle;
 138 static dissector_handle_t rtp_rfc2198_handle;
 139 static dissector_handle_t stun_handle;
 140 static dissector_handle_t t38_handle;
 141
 142 static dissector_handle_t pkt_ccc_handle;
 143
 144 static int rtp_tap = -1;
 145
 146 static dissector_table_t rtp_pt_dissector_table;
 147 static dissector_table_t rtp_dyn_pt_dissector_table;
 148
 149 static dissector_table_t rtp_hdr_ext_dissector_table;
 150
 151 /* RTP header fields             */
 152 static int proto_rtp           = -1;
 153 static int hf_rtp_version      = -1;
 154 static int hf_rtp_padding      = -1;
 155 static int hf_rtp_extension    = -1;
 156 static int hf_rtp_csrc_count   = -1;
 157 static int hf_rtp_marker       = -1;
 158 static int hf_rtp_payload_type = -1;
 159 static int hf_rtp_seq_nr       = -1;
 160 static int hf_rtp_ext_seq_nr   = -1;
 161 static int hf_rtp_timestamp    = -1;
 162 static int hf_rtp_ssrc         = -1;
 163 static int hf_rtp_csrc_items   = -1;
 164 static int hf_rtp_csrc_item    = -1;
 165 static int hf_rtp_data         = -1;
 166 static int hf_rtp_padding_data = -1;
 167 static int hf_rtp_padding_count= -1;
 168 static int hf_rtp_rfc2198_follow= -1;
 169 static int hf_rtp_rfc2198_tm_off= -1;
 170 static int hf_rtp_rfc2198_bl_len= -1;
 171
 172 /* RTP header extension fields   */
 173 static int hf_rtp_prof_define  = -1;
 174 static int hf_rtp_length       = -1;
 175 static int hf_rtp_hdr_exts     = -1;
 176 static int hf_rtp_hdr_ext      = -1;
 177
 178 /* RTP setup fields */
 179 static int hf_rtp_setup        = -1;
 180 static int hf_rtp_setup_frame  = -1;
 181 static int hf_rtp_setup_method = -1;
 182
 183 /* RTP fields defining a sub tree */
 184 static gint ett_rtp       = -1;
 185 static gint ett_csrc_list = -1;
 186 static gint ett_hdr_ext   = -1;
 187 static gint ett_rtp_setup = -1;
 188 static gint ett_rtp_rfc2198 = -1;
 189 static gint ett_rtp_rfc2198_hdr = -1;
 190
 191 /* SRTP fields */
 192 static int hf_srtp_encrypted_payload = -1;
 193 static int hf_srtp_mki = -1;
 194 static int hf_srtp_auth_tag = -1;
 195
 196 /* PacketCable CCC header fields */
 197 static int proto_pkt_ccc       = -1;
 198 static int hf_pkt_ccc_id       = -1;
 199 static int hf_pkt_ccc_ts       = -1;
 200
 201 /* PacketCable CCC field defining a sub tree */
 202 static gint ett_pkt_ccc = -1;
 203
 204 /* PacketCable CCC port preference */
 205 static gboolean global_pkt_ccc_udp_port = 0;
 206
 207
 208 #define RTP0_INVALID 0
 209 #define RTP0_STUN    1
 210 #define RTP0_T38     2
 211
 212 static enum_val_t rtp_version0_types[] = {
 213         { "invalid", "Invalid RTP packets", RTP0_INVALID },
 214         { "stun", "STUN packets", RTP0_STUN },
 215         { "t38", "T.38 packets", RTP0_T38 },
 216         { NULL, NULL, 0 }
 217 };
 218 static guint global_rtp_version0_type = 0;
 219
 220 static dissector_handle_t data_handle;
 221
 222 /* Forward declaration we need below */
 223 void proto_reg_handoff_rtp(void);
 224
 225 static gboolean dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo,
 226     proto_tree *tree );
 227 static void dissect_rtp( tvbuff_t *tvb, packet_info *pinfo,
 228     proto_tree *tree );
 229 static void show_setup_info(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
 230 static void get_conv_info(packet_info *pinfo, struct _rtp_info *rtp_info);
 231
 232 /* Preferences bool to control whether or not setup info should be shown */
 233 static gboolean global_rtp_show_setup_info = TRUE;
 234
 235 /* Try heuristic RTP decode */
 236 static gboolean global_rtp_heur = FALSE;
 237
 238 /* desegment RTP streams */
 239 static gboolean desegment_rtp = TRUE;
 240
 241 /* RFC2198 Redundant Audio Data */
 242 static guint rtp_rfc2198_pt = 99;
 243 static guint rtp_saved_rfc2198_pt = 0;
 244
 245 /*
 246  * Fields in the first octet of the RTP header.
 247  */
 248
 249 /* Version is the first 2 bits of the first octet*/
 250 #define RTP_VERSION(octet)      ((octet) >> 6)
 251
 252 /* Padding is the third bit; No need to shift, because true is any value
 253    other than 0! */
 254 #define RTP_PADDING(octet)      ((octet) & 0x20)
 255
 256 /* Extension bit is the fourth bit */
 257 #define RTP_EXTENSION(octet)    ((octet) & 0x10)
 258
 259 /* CSRC count is the last four bits */
 260 #define RTP_CSRC_COUNT(octet)   ((octet) & 0xF)
 261
 262 static const value_string rtp_version_vals[] =
 263 {
 264         { 0, "Old VAT Version" },
 265         { 1, "First Draft Version" },
 266         { 2, "RFC 1889 Version" },
 267         { 0, NULL },
 268 };
 269
 270 /*
 271  * Fields in the second octet of the RTP header.
 272  */
 273
 274 /* Marker is the first bit of the second octet */
 275 #define RTP_MARKER(octet)       ((octet) & 0x80)
 276
 277 /* Payload type is the last 7 bits */
 278 #define RTP_PAYLOAD_TYPE(octet) ((octet) & 0x7F)
 279
 280 const value_string rtp_payload_type_vals[] =
 281 {
 282         { PT_PCMU,      "ITU-T G.711 PCMU" },
 283         { PT_1016,      "USA Federal Standard FS-1016" },
 284         { PT_G721,      "ITU-T G.721" },
 285         { PT_GSM,       "GSM 06.10" },
 286         { PT_G723,      "ITU-T G.723" },
 287         { PT_DVI4_8000, "DVI4 8000 samples/s" },
 288         { PT_DVI4_16000, "DVI4 16000 samples/s" },
 289         { PT_LPC,       "Experimental linear predictive encoding from Xerox PARC" },
 290         { PT_PCMA,      "ITU-T G.711 PCMA" },
 291         { PT_G722,      "ITU-T G.722" },
 292         { PT_L16_STEREO, "16-bit uncompressed audio, stereo" },
 293         { PT_L16_MONO,  "16-bit uncompressed audio, monaural" },
 294         { PT_QCELP,     "Qualcomm Code Excited Linear Predictive coding" },
 295         { PT_CN,        "Comfort noise" },
 296         { PT_MPA,       "MPEG-I/II Audio"},
 297         { PT_G728,      "ITU-T G.728" },
 298         { PT_DVI4_11025, "DVI4 11025 samples/s" },
 299         { PT_DVI4_22050, "DVI4 22050 samples/s" },
 300         { PT_G729,      "ITU-T G.729" },
 301         { PT_CN_OLD,    "Comfort noise (old)" },
 302         { PT_CELB,      "Sun CellB video encoding" },
 303         { PT_JPEG,      "JPEG-compressed video" },
 304         { PT_NV,        "'nv' program" },
 305         { PT_H261,      "ITU-T H.261" },
 306         { PT_MPV,       "MPEG-I/II Video"},
 307         { PT_MP2T,      "MPEG-II transport streams"},
 308         { PT_H263,      "ITU-T H.263" },
 309         { 0,            NULL },
 310 };
 311
 312 const value_string rtp_payload_type_short_vals[] =
 313 {
 314        { PT_PCMU,      "g711U" },
 315        { PT_1016,      "fs-1016" },
 316        { PT_G721,      "g721" },
 317        { PT_GSM,       "GSM" },
 318        { PT_G723,      "g723" },
 319        { PT_DVI4_8000, "DVI4 8k" },
 320        { PT_DVI4_16000, "DVI4 16k" },
 321        { PT_LPC,       "Exp. from Xerox PARC" },
 322        { PT_PCMA,      "g711A" },
 323        { PT_G722,      "g722" },
 324        { PT_L16_STEREO, "16-bit audio, stereo" },
 325        { PT_L16_MONO,  "16-bit audio, monaural" },
 326        { PT_QCELP,     "Qualcomm" },
 327        { PT_CN,        "CN" },
 328        { PT_MPA,       "MPEG-I/II Audio"},
 329        { PT_G728,      "g728" },
 330        { PT_DVI4_11025, "DVI4 11k" },
 331        { PT_DVI4_22050, "DVI4 22k" },
 332        { PT_G729,      "g729" },
 333        { PT_CN_OLD,    "CN(old)" },
 334        { PT_CELB,      "CellB" },
 335        { PT_JPEG,      "JPEG" },
 336        { PT_NV,        "NV" },
 337        { PT_H261,      "h261" },
 338        { PT_MPV,       "MPEG-I/II Video"},
 339        { PT_MP2T,      "MPEG-II streams"},
 340        { PT_H263,      "h263" },
 341        { 0,            NULL },
 342 };
 343
 344 static const value_string srtp_encryption_alg_vals[] =
 345 {
 346         { SRTP_ENC_ALG_NULL,    "Null Encryption" },
 347         { SRTP_ENC_ALG_AES_CM, "AES-128 Counter Mode" },
 348         { SRTP_ENC_ALG_AES_F8,  "AES-128 F8 Mode" },
 349         { 0, NULL },
 350 };
 351
 352 static const value_string srtp_auth_alg_vals[] =
 353 {
 354         { SRTP_AUTH_ALG_NONE,           "No Authentication" },
 355         { SRTP_AUTH_ALG_HMAC_SHA1,      "HMAC-SHA1" },
 356         { 0, NULL },
 357 };
 358
 359
 360 /* initialisation routine */
 361 static void rtp_fragment_init(void)
 362 {
 363         fragment_table_init(&fragment_table);
 364         fid_table = g_hash_table_new(g_direct_hash, g_direct_equal);
 365 }
 366
 367 void
 368 rtp_free_hash_dyn_payload(GHashTable *rtp_dyn_payload)
 369 {
 370         if (rtp_dyn_payload == NULL) return;
 371         g_hash_table_destroy(rtp_dyn_payload);
 372         rtp_dyn_payload = NULL;
 373 }
 374
 375 /* Set up an SRTP conversation */
 376 void srtp_add_address(packet_info *pinfo,
 377                      address *addr, int port,
 378                      int other_port,
 379                      const gchar *setup_method, guint32 setup_frame_number, GHashTable *rtp_dyn_payload,
 380                      struct srtp_info *srtp_info)
 381 {
 382         address null_addr;
 383         conversation_t* p_conv;
 384         struct _rtp_conversation_info *p_conv_data = NULL;
 385
 386         /*
 387          * If this isn't the first time this packet has been processed,
 388          * we've already done this work, so we don't need to do it
 389          * again.
 390          */
 391         if (pinfo->fd->flags.visited)
 392         {
 393                 return;
 394         }
 395
 396         printf("#%u: %srtp_add_address(%s, %u, %u, %s, %u\n", pinfo->fd->num, (srtp_info)?"s":"", address_to_str(addr), port, other_port, setup_method, setup_frame_number);
 397
 398         SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);
 399
 400         /*
 401          * Check if the ip address and port combination is not
 402          * already registered as a conversation.
 403          */
 404         p_conv = find_conversation( setup_frame_number, addr, &null_addr, PT_UDP, port, other_port,
 405                                 NO_ADDR_B | (!other_port ? NO_PORT_B : 0));
 406
 407         /*
 408          * If not, create a new conversation.
 409          */
 410         if ( !p_conv || p_conv->setup_frame != setup_frame_number) {
 411                 p_conv = conversation_new( setup_frame_number, addr, &null_addr, PT_UDP,
 412                                            (guint32)port, (guint32)other_port,
 413                                                                    NO_ADDR2 | (!other_port ? NO_PORT2 : 0));
 414         }
 415
 416         /* Set dissector */
 417         conversation_set_dissector(p_conv, rtp_handle);
 418
 419         /*
 420          * Check if the conversation has data associated with it.
 421          */
 422         p_conv_data = conversation_get_proto_data(p_conv, proto_rtp);
 423
 424         /*
 425          * If not, add a new data item.
 426          */
 427         if ( ! p_conv_data ) {
 428                 /* Create conversation data */
 429                 p_conv_data = se_alloc(sizeof(struct _rtp_conversation_info));
 430                 p_conv_data->rtp_dyn_payload = NULL;
 431
 432                 /* start this at 0x10000 so that we cope gracefully with the
 433                  * first few packets being out of order (hence 0,65535,1,2,...)
 434                  */
 435                 p_conv_data->extended_seqno = 0x10000;
 436                 p_conv_data->rtp_conv_info = se_alloc(sizeof(rtp_private_conv_info));
 437                 p_conv_data->rtp_conv_info->multisegment_pdus = se_tree_create(EMEM_TREE_TYPE_RED_BLACK,"rtp_ms_pdus");
 438                 conversation_add_proto_data(p_conv, proto_rtp, p_conv_data);
 439         }
 440
 441         /*
 442          * Update the conversation data.
 443          */
 444         /* Free the hash if already exists */
 445         rtp_free_hash_dyn_payload(p_conv_data->rtp_dyn_payload);
 446
 447         strncpy(p_conv_data->method, setup_method, MAX_RTP_SETUP_METHOD_SIZE);
 448         p_conv_data->method[MAX_RTP_SETUP_METHOD_SIZE] = '\0';
 449         p_conv_data->frame_number = setup_frame_number;
 450         p_conv_data->rtp_dyn_payload = rtp_dyn_payload;
 451         p_conv_data->srtp_info = srtp_info;
 452 }
 453
 454 /* Set up an RTP conversation */
 455 void rtp_add_address(packet_info *pinfo,
 456                      address *addr, int port,
 457                      int other_port,
 458                      const gchar *setup_method, guint32 setup_frame_number, GHashTable *rtp_dyn_payload)
 459 {
 460         srtp_add_address(pinfo, addr, port, other_port, setup_method, setup_frame_number, rtp_dyn_payload, NULL);
 461 }
 462
 463 static gboolean
 464 dissect_rtp_heur( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
 465 {
 466         guint8      octet1, octet2;
 467         unsigned int version;
 468         unsigned int payload_type;
 469         unsigned int offset = 0;
 470
 471         /* This is a heuristic dissector, which means we get all the UDP
 472          * traffic not sent to a known dissector and not claimed by
 473          * a heuristic dissector called before us!
 474          */
 475
 476         if (! global_rtp_heur)
 477                 return FALSE;
 478
 479         /* Get the fields in the first octet */
 480         octet1 = tvb_get_guint8( tvb, offset );
 481         version = RTP_VERSION( octet1 );
 482
 483         if (version == 0) {
 484                 switch (global_rtp_version0_type) {
 485                 case RTP0_STUN:
 486                         call_dissector(stun_handle, tvb, pinfo, tree);
 487                         return TRUE;
 488
 489                 case RTP0_T38:
 490                         call_dissector(t38_handle, tvb, pinfo, tree);
 491                         return TRUE;
 492
 493                 case RTP0_INVALID:
 494                 default:
 495                         return FALSE; /* Unknown or unsupported version */
 496                 }
 497         } else if (version != 2) {
 498                 /* Unknown or unsupported version */
 499                 return FALSE;
 500         }
 501
 502         /* Get the fields in the second octet */
 503         octet2 = tvb_get_guint8( tvb, offset + 1 );
 504         payload_type = RTP_PAYLOAD_TYPE( octet2 );
 505         /*      if (payload_type == PT_PCMU ||
 506          *                   payload_type == PT_PCMA)
 507          *           payload_type == PT_G729)
 508          *       */
 509         if (payload_type <= PT_H263) {
 510                 dissect_rtp( tvb, pinfo, tree );
 511                 return TRUE;
 512         }
 513         else {
 514                 return FALSE;
 515         }
 516 }
 517
 518 /*
 519  * Process the payload of the RTP packet, hand it to the subdissector
 520  */
 521 static void
 522 process_rtp_payload(tvbuff_t *newtvb, packet_info *pinfo, proto_tree *tree,
 523     proto_tree *rtp_tree,
 524     unsigned int payload_type)
 525 {
 526         struct _rtp_conversation_info *p_conv_data = NULL;
 527         gboolean found_match = FALSE;
 528         int payload_len;
 529         struct srtp_info *srtp_info;
 530         int offset=0;
 531
 532         payload_len = tvb_length_remaining(newtvb, offset);
 533
 534         /* first check if this is added as an SRTP stream - if so, don't try to dissector the payload data for now */
 535         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
 536         if (p_conv_data && p_conv_data->srtp_info) {
 537                 srtp_info = p_conv_data->srtp_info;
 538                 payload_len -= srtp_info->mki_len + srtp_info->auth_tag_len;
 539
 540                 if (p_conv_data->srtp_info->encryption_algorithm==SRTP_ENC_ALG_NULL) {
 541                         if (rtp_tree)
 542                                 proto_tree_add_text(rtp_tree, newtvb, offset, payload_len, "SRTP Payload with NULL encryption");
 543                 }
 544                 else {
 545                         if (rtp_tree)
 546                                 proto_tree_add_item(rtp_tree, hf_srtp_encrypted_payload, newtvb, offset, payload_len, FALSE);
 547                         found_match = TRUE;     /* use this flag to prevent dissection below */
 548                 }
 549                 offset += payload_len;
 550
 551                 if (srtp_info->mki_len) {
 552                         proto_tree_add_item(rtp_tree, hf_srtp_mki, newtvb, offset, srtp_info->mki_len, FALSE);
 553                         offset += srtp_info->mki_len;
 554                 }
 555
 556                 if (srtp_info->auth_tag_len) {
 557                         proto_tree_add_item(rtp_tree, hf_srtp_auth_tag, newtvb, offset, srtp_info->auth_tag_len, FALSE);
 558                         offset += srtp_info->auth_tag_len;
 559                 }
 560         }
 561
 562         /* if the payload type is dynamic (96 to 127), we check if the conv is set and we look for the pt definition */
 563         else if ( (payload_type >=96) && (payload_type <=127) ) {
 564                 if (p_conv_data && p_conv_data->rtp_dyn_payload) {
 565                         gchar *payload_type_str = NULL;
 566                         payload_type_str = g_hash_table_lookup(p_conv_data->rtp_dyn_payload, &payload_type);
 567                         if (payload_type_str){
 568                                 found_match = dissector_try_string(rtp_dyn_pt_dissector_table,
 569                                                                                                         payload_type_str, newtvb, pinfo, tree);
 570                                 /* If payload type string set from conversation and
 571                                  * no matching dissector found it's probably because no subdissector
 572                                  * exists. Don't call the dissectors based on payload number
 573                                  * as that'd probably be the wrong dissector in this case.
 574                                  * Just add it as data.
 575                                  */
 576                                 if(found_match==FALSE)
 577                                         proto_tree_add_item( rtp_tree, hf_rtp_data, newtvb, 0, -1, FALSE );
 578                                 return;
 579                         }
 580
 581                 }
 582         }
 583
 584         /* if we don't found, it is static OR could be set static from the preferences */
 585         if (!found_match && !dissector_try_port(rtp_pt_dissector_table, payload_type, newtvb, pinfo, tree))
 586                 proto_tree_add_item( rtp_tree, hf_rtp_data, newtvb, 0, -1, FALSE );
 587
 588 }
 589
 590 /* Rtp payload reassembly
 591  *
 592  * This handles the reassembly of PDUs for higher-level protocols.
 593  *
 594  * We're a bit limited on how we can cope with out-of-order packets, because
 595  * we don't have any idea of where the datagram boundaries are. So if we see
 596  * packets A, C, B (all of which comprise a single datagram), we cannot know
 597  * that C should be added to the same datagram as A, until we come to B (which
 598  * may or may not actually be present...).
 599  *
 600  * What we end up doing in this case is passing A+B to the subdissector as one
 601  * datagram, and make out that a new one starts on C.
 602  */
 603 static void
 604 dissect_rtp_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
 605     proto_tree *rtp_tree, int offset, unsigned int data_len,
 606     unsigned int data_reported_len,
 607         unsigned int payload_type )
 608 {
 609         tvbuff_t *newtvb;
 610         struct _rtp_conversation_info *p_conv_data= NULL;
 611         gboolean must_desegment = FALSE;
 612         rtp_private_conv_info *finfo = NULL;
 613         rtp_multisegment_pdu *msp = NULL;
 614         guint32 seqno;
 615
 616         /* Retrieve RTPs idea of a converation */
 617         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
 618
 619         if(p_conv_data != NULL)
 620                 finfo = p_conv_data->rtp_conv_info;
 621
 622         if(finfo == NULL || !desegment_rtp) {
 623                 /* Hand the whole lot off to the subdissector */
 624                 newtvb=tvb_new_subset(tvb,offset,data_len,data_reported_len);
 625                 process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
 626                 return;
 627         }
 628
 629         seqno = p_conv_data->extended_seqno;
 630
 631         pinfo->can_desegment = 2;
 632         pinfo->desegment_offset = 0;
 633         pinfo->desegment_len = 0;
 634
 635 #ifdef DEBUG_FRAGMENTS
 636         g_debug("%d: RTP Part of convo %d(%p); seqno %d",
 637                 pinfo->fd->num,
 638                 p_conv_data->frame_number, p_conv_data,
 639                 seqno
 640                 );
 641 #endif
 642
 643         /* look for a pdu which we might be extending */
 644         msp = (rtp_multisegment_pdu *)se_tree_lookup32_le(finfo->multisegment_pdus,seqno-1);
 645
 646         if(msp && msp->startseq < seqno && msp->endseq >= seqno) {
 647                 guint32 fid = msp->startseq;
 648                 fragment_data *fd_head;
 649
 650 #ifdef DEBUG_FRAGMENTS
 651                 g_debug("\tContinues fragment %d", fid);
 652 #endif
 653
 654                 /* we always assume the datagram is complete; if this is the
 655                  * first pass, that's our best guess, and if it's not, what we
 656                  * say gets ignored anyway.
 657                  */
 658                 fd_head = fragment_add_seq(tvb, offset, pinfo, fid, fragment_table,
 659                                            seqno-msp->startseq, data_len, FALSE);
 660
 661                 newtvb = process_reassembled_data(tvb,offset, pinfo, "Reassembled RTP", fd_head,
 662                                                   &rtp_fragment_items, NULL, tree);
 663
 664 #ifdef DEBUG_FRAGMENTS
 665                 g_debug("\tFragment Coalesced; fd_head=%p, newtvb=%p (len %d)",fd_head, newtvb,
 666                         newtvb?tvb_reported_length(newtvb):0);
 667 #endif
 668
 669                 if(newtvb != NULL) {
 670                         /* Hand off to the subdissector */
 671                         process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
 672
 673                         /*
 674                          * Check to see if there were any complete fragments within the chunk
 675                          */
 676                         if( pinfo->desegment_len && pinfo->desegment_offset == 0 )
 677                         {
 678 #ifdef DEBUG_FRAGMENTS
 679                                 g_debug("\tNo complete pdus in payload" );
 680 #endif
 681                                 /* Mark the fragments and not complete yet */
 682                                 fragment_set_partial_reassembly(pinfo, fid, fragment_table);
 683
 684                                 /* we must need another segment */
 685                                 msp->endseq = MIN(msp->endseq,seqno) + 1;
 686                         }
 687                         else
 688                         {
 689                                 /*
 690                                  * Data was dissected so add the protocol tree to the display
 691                                  */
 692                                 proto_item *rtp_tree_item, *frag_tree_item;
 693                                 /* this nargery is to insert the fragment tree into the main tree
 694                                  * between the RTP protocol entry and the subdissector entry */
 695                                 show_fragment_tree(fd_head, &rtp_fragment_items, tree, pinfo, newtvb, &frag_tree_item);
 696                                 rtp_tree_item = proto_item_get_parent( proto_tree_get_parent( rtp_tree ));
 697                                 if( frag_tree_item && rtp_tree_item )
 698                                         proto_tree_move_item( tree, rtp_tree_item, frag_tree_item );
 699
 700
 701                                 if(pinfo->desegment_len)
 702                                 {
 703                                         /* the higher-level dissector has asked for some more data - ie,
 704                                            the end of this segment does not coincide with the end of a
 705                                            higher-level PDU. */
 706                                         must_desegment = TRUE;
 707                                 }
 708                         }
 709
 710                 }
 711
 712         }
 713         else
 714         {
 715                 /*
 716                  * The segment is not the continuation of a fragmented segment
 717                  * so process it as normal
 718                  */
 719 #ifdef DEBUG_FRAGMENTS
 720                 g_debug("\tRTP non-fragment payload");
 721 #endif
 722                 newtvb = tvb_new_subset( tvb, offset, data_len, data_reported_len );
 723
 724                 /* Hand off to the subdissector */
 725                 process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
 726
 727                 if(pinfo->desegment_len) {
 728                         /* the higher-level dissector has asked for some more data - ie,
 729                            the end of this segment does not coincide with the end of a
 730                            higher-level PDU. */
 731                         must_desegment = TRUE;
 732                 }
 733         }
 734
 735         /*
 736          * There were bytes left over that the higher protocol couldn't dissect so save them
 737          */
 738         if(must_desegment)
 739         {
 740                 guint32 deseg_offset = pinfo->desegment_offset;
 741                 guint32 frag_len = tvb_reported_length_remaining(newtvb, deseg_offset);
 742                 fragment_data *fd_head = NULL;
 743
 744 #ifdef DEBUG_FRAGMENTS
 745                 g_debug("\tRTP Must Desegment: tvb_len=%d ds_len=%d %d frag_len=%d ds_off=%d",
 746                         tvb_reported_length(newtvb),
 747                         pinfo->desegment_len,
 748                         pinfo->fd->flags.visited,
 749                         frag_len,
 750                         deseg_offset);
 751 #endif
 752                 /* allocate a new msp for this pdu */
 753                 msp = se_alloc(sizeof(rtp_multisegment_pdu));
 754                 msp->startseq = seqno;
 755                 msp->endseq = seqno+1;
 756                 se_tree_insert32(finfo->multisegment_pdus,seqno,msp);
 757
 758                 /*
 759                  * Add the fragment to the fragment table
 760                  */
 761                 fd_head = fragment_add_seq(newtvb,deseg_offset, pinfo, seqno, fragment_table, 0, frag_len,
 762                                            TRUE );
 763
 764                 if(fd_head != NULL)
 765                 {
 766                         if( fd_head->reassembled_in != 0 && !(fd_head->flags & FD_PARTIAL_REASSEMBLY) )
 767                         {
 768                                 proto_item *rtp_tree_item;
 769                                 rtp_tree_item = proto_tree_add_uint( tree, hf_rtp_reassembled_in,
 770                                                                      newtvb, deseg_offset, tvb_reported_length_remaining(newtvb,deseg_offset),
 771                                                                      fd_head->reassembled_in);
 772                                 PROTO_ITEM_SET_GENERATED(rtp_tree_item);
 773 #ifdef DEBUG_FRAGMENTS
 774                                 g_debug("\tReassembled in %d", fd_head->reassembled_in);
 775 #endif
 776                         }
 777                         else
 778                         {
 779 #ifdef DEBUG_FRAGMENTS
 780                                 g_debug("\tUnfinished fragment");
 781 #endif
 782                                 /* this fragment is never reassembled */
 783                                 proto_tree_add_text( tree, tvb, deseg_offset, -1,"RTP fragment, unfinished");
 784                         }
 785                 }
 786                 else
 787                 {
 788                         /*
 789                          * This fragment was the first fragment in a new entry in the
 790                          * frag_table; we don't yet know where it is reassembled
 791                          */
 792 #ifdef DEBUG_FRAGMENTS
 793                         g_debug("\tnew pdu");
 794 #endif
 795                 }
 796
 797                 if( pinfo->desegment_offset == 0 )
 798                 {
 799                         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 800                         {
 801                                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTP");
 802                         }
 803                         if (check_col(pinfo->cinfo, COL_INFO))
 804                         {
 805                                 col_set_str(pinfo->cinfo, COL_INFO, "[RTP segment of a reassembled PDU]");
 806                         }
 807                 }
 808         }
 809
 810
 811
 812         pinfo->can_desegment = 0;
 813         pinfo->desegment_offset = 0;
 814         pinfo->desegment_len = 0;
 815 }
 816
 817
 818
 819 static void
 820 dissect_rtp_rfc2198(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
 821 {
 822         int offset = 0;
 823         guint8 octet1;
 824         int cnt;
 825         gboolean hdr_follow = TRUE;
 826         proto_item *ti = NULL;
 827         proto_tree *rfc2198_tree = NULL;
 828         proto_tree *rfc2198_hdr_tree = NULL;
 829         rfc2198_hdr *hdr_last, *hdr_new;
 830         rfc2198_hdr *hdr_chain = NULL;
 831         struct _rtp_conversation_info *p_conv_data= NULL;
 832         gchar *payload_type_str;
 833
 834         /* Retrieve RTPs idea of a converation */
 835         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
 836
 837         /* Add try to RFC 2198 data */
 838         ti = proto_tree_add_text(tree, tvb, offset, -1, "RFC 2198: Redundant Audio Data");
 839         rfc2198_tree = proto_item_add_subtree(ti, ett_rtp_rfc2198);
 840
 841         hdr_last = NULL;
 842         cnt = 0;
 843         while (hdr_follow) {
 844                 cnt++;
 845                 payload_type_str = NULL;
 846
 847                 /* Allocate and fill in header */
 848                 hdr_new = ep_alloc(sizeof(rfc2198_hdr));
 849                 hdr_new->next = NULL;
 850                 octet1 = tvb_get_guint8(tvb, offset);
 851                 hdr_new->pt = RTP_PAYLOAD_TYPE(octet1);
 852                 hdr_follow = (octet1 & 0x80);
 853
 854                 /* if it is dynamic payload, let use the conv data to see if it is defined */
 855                 if ((hdr_new->pt > 95) && (hdr_new->pt < 128)) {
 856                         if (p_conv_data && p_conv_data->rtp_dyn_payload){
 857                                 payload_type_str = g_hash_table_lookup(p_conv_data->rtp_dyn_payload, &hdr_new->pt);
 858                         }
 859                 }
 860                 /* Add a subtree for this header and add items */
 861                 ti = proto_tree_add_text(rfc2198_tree, tvb, offset, (hdr_follow)?4:1, "Header %u", cnt);
 862                 rfc2198_hdr_tree = proto_item_add_subtree(ti, ett_rtp_rfc2198_hdr);
 863                 proto_tree_add_item(rfc2198_hdr_tree, hf_rtp_rfc2198_follow, tvb, offset, 1, FALSE );
 864                 proto_tree_add_uint_format(rfc2198_hdr_tree, hf_rtp_payload_type, tvb,
 865                     offset, 1, octet1, "Payload type: %s (%u)",
 866                         payload_type_str ? payload_type_str : val_to_str(hdr_new->pt, rtp_payload_type_vals, "Unknown"),
 867                         hdr_new->pt);
 868                 proto_item_append_text(ti, ": PT=%s", payload_type_str ? payload_type_str : val_to_str(hdr_new->pt, rtp_payload_type_vals, "Unknown (%u)"));
 869                 offset += 1;
 870
 871                 /* Timestamp offset and block length don't apply to last header */
 872                 if (hdr_follow) {
 873                         proto_tree_add_item(rfc2198_hdr_tree, hf_rtp_rfc2198_tm_off, tvb, offset, 2, FALSE );
 874                         proto_tree_add_item(rfc2198_hdr_tree, hf_rtp_rfc2198_bl_len, tvb, offset + 1, 2, FALSE );
 875                         hdr_new->len = tvb_get_ntohs(tvb, offset + 1) & 0x03FF;
 876                         proto_item_append_text(ti, ", len=%u", hdr_new->len);
 877                         offset += 3;
 878                 } else {
 879                         hdr_new->len = -1;
 880                         hdr_follow = FALSE;
 881                 }
 882
 883                 if (hdr_last) {
 884                         hdr_last->next = hdr_new;
 885                 } else {
 886                         hdr_chain = hdr_new;
 887                 }
 888                 hdr_last = hdr_new;
 889         }
 890
 891         /* Dissect each data block according to the header info */
 892         hdr_last = hdr_chain;
 893         while (hdr_last) {
 894                 hdr_last->offset = offset;
 895                 if (!hdr_last->next) {
 896                         hdr_last->len = tvb_reported_length_remaining(tvb, offset);
 897                 }
 898                 dissect_rtp_data(tvb, pinfo, tree, rfc2198_tree, hdr_last->offset, hdr_last->len, hdr_last->len, hdr_last->pt);
 899                 offset += hdr_last->len;
 900                 hdr_last = hdr_last->next;
 901         }
 902 }
 903
 904 static void
 905 dissect_rtp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
 906 {
 907         proto_item *ti            = NULL;
 908         proto_tree *rtp_tree      = NULL;
 909         proto_tree *rtp_csrc_tree = NULL;
 910         proto_tree *rtp_hext_tree = NULL;
 911         guint8      octet1, octet2;
 912         unsigned int version;
 913         gboolean    padding_set;
 914         gboolean    extension_set;
 915         unsigned int csrc_count;
 916         gboolean    marker_set;
 917         unsigned int payload_type;
 918         gchar *payload_type_str = NULL;
 919         gboolean    is_srtp = FALSE;
 920         unsigned int i            = 0;
 921         unsigned int hdr_extension= 0;
 922         unsigned int padding_count;
 923         gint        length, reported_length;
 924         int         data_len;
 925         unsigned int offset = 0;
 926         guint16     seq_num;
 927         guint32     timestamp;
 928         guint32     sync_src;
 929         guint32     csrc_item;
 930         struct _rtp_conversation_info *p_conv_data = NULL;
 931         struct srtp_info *srtp_info = NULL;
 932         unsigned int srtp_offset;
 933         tvbuff_t *newtvb = NULL;
 934
 935         /* Can tap up to 4 RTP packets within same packet */
 936         static struct _rtp_info rtp_info_arr[4];
 937         static int rtp_info_current=0;
 938         struct _rtp_info *rtp_info;
 939
 940         rtp_info_current++;
 941         if (rtp_info_current==4) {
 942                 rtp_info_current=0;
 943         }
 944         rtp_info = &rtp_info_arr[rtp_info_current];
 945
 946         /* Get the fields in the first octet */
 947         octet1 = tvb_get_guint8( tvb, offset );
 948         version = RTP_VERSION( octet1 );
 949
 950         if (version == 0) {
 951                 switch (global_rtp_version0_type) {
 952                 case RTP0_STUN:
 953                         call_dissector(stun_handle, tvb, pinfo, tree);
 954                         return;
 955
 956                 case RTP0_T38:
 957                         call_dissector(t38_handle, tvb, pinfo, tree);
 958                         return;
 959
 960                 case RTP0_INVALID:
 961                 default:
 962                         ; /* Unknown or unsupported version (let it fall through */
 963                 }
 964         }
 965
 966         /* fill in the rtp_info structure */
 967         rtp_info->info_version = version;
 968         if (version != 2) {
 969                 /*
 970                  * Unknown or unsupported version.
 971                  */
 972                 if ( check_col( pinfo->cinfo, COL_PROTOCOL ) )   {
 973                         col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP" );
 974                 }
 975
 976                 if ( check_col( pinfo->cinfo, COL_INFO) ) {
 977                         col_add_fstr( pinfo->cinfo, COL_INFO,
 978                             "Unknown RTP version %u", version);
 979                 }
 980
 981                 if ( tree ) {
 982                         ti = proto_tree_add_item( tree, proto_rtp, tvb, offset, -1, FALSE );
 983                         rtp_tree = proto_item_add_subtree( ti, ett_rtp );
 984
 985                         proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
 986                             offset, 1, octet1);
 987                 }
 988                 return;
 989         }
 990
 991         padding_set = RTP_PADDING( octet1 );
 992         extension_set = RTP_EXTENSION( octet1 );
 993         csrc_count = RTP_CSRC_COUNT( octet1 );
 994
 995         /* Get the fields in the second octet */
 996         octet2 = tvb_get_guint8( tvb, offset + 1 );
 997         marker_set = RTP_MARKER( octet2 );
 998         payload_type = RTP_PAYLOAD_TYPE( octet2 );
 999
1000         /* Get the subsequent fields */
1001         seq_num = tvb_get_ntohs( tvb, offset + 2 );
1002         timestamp = tvb_get_ntohl( tvb, offset + 4 );
1003         sync_src = tvb_get_ntohl( tvb, offset + 8 );
1004
1005         /* fill in the rtp_info structure */
1006         rtp_info->info_padding_set = padding_set;
1007         rtp_info->info_padding_count = 0;
1008         rtp_info->info_marker_set = marker_set;
1009         rtp_info->info_payload_type = payload_type;
1010         rtp_info->info_seq_num = seq_num;
1011         rtp_info->info_timestamp = timestamp;
1012         rtp_info->info_sync_src = sync_src;
1013         rtp_info->info_is_srtp = FALSE;
1014         rtp_info->info_setup_frame_num = 0;
1015         rtp_info->info_payload_type_str = NULL;
1016
1017         /*
1018          * Do we have all the data?
1019          */
1020         length = tvb_length_remaining(tvb, offset);
1021         reported_length = tvb_reported_length_remaining(tvb, offset);
1022         if (reported_length >= 0 && length >= reported_length) {
1023                 /*
1024                  * Yes.
1025                  */
1026                 rtp_info->info_all_data_present = TRUE;
1027                 rtp_info->info_data_len = reported_length;
1028
1029                 /*
1030                  * Save the pointer to raw rtp data (header + payload incl.
1031                  * padding).
1032                  * That should be safe because the "epan_dissect_t"
1033                  * constructed for the packet has not yet been freed when
1034                  * the taps are called.
1035                  * (Destroying the "epan_dissect_t" will end up freeing
1036                  * all the tvbuffs and hence invalidating pointers to
1037                  * their data.)
1038                  * See "add_packet_to_packet_list()" for details.
1039                  */
1040                 rtp_info->info_data = tvb_get_ptr(tvb, 0, -1);
1041         } else {
1042                 /*
1043                  * No - packet was cut short at capture time.
1044                  */
1045                 rtp_info->info_all_data_present = FALSE;
1046                 rtp_info->info_data_len = 0;
1047                 rtp_info->info_data = NULL;
1048         }
1049
1050         /* Look for conv and add to the frame if found */
1051         get_conv_info(pinfo, rtp_info);
1052         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
1053
1054         if (p_conv_data && p_conv_data->srtp_info) is_srtp = TRUE;
1055         rtp_info->info_is_srtp = is_srtp;
1056
1057         if ( check_col( pinfo->cinfo, COL_PROTOCOL ) )   {
1058                 col_set_str( pinfo->cinfo, COL_PROTOCOL, (is_srtp) ? "SRTP" : "RTP" );
1059         }
1060
1061         /* check if this is added as an SRTP stream - if so, don't try to dissector the payload data for now */
1062         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
1063         if (p_conv_data && p_conv_data->srtp_info) {
1064                 srtp_info = p_conv_data->srtp_info;
1065                 if (rtp_info->info_all_data_present) {
1066                         srtp_offset = rtp_info->info_data_len - srtp_info->mki_len - srtp_info->auth_tag_len;
1067                 }
1068         }
1069
1070         /* if it is dynamic payload, let use the conv data to see if it is defined */
1071         if ( (payload_type>95) && (payload_type<128) ) {
1072                 if (p_conv_data && p_conv_data->rtp_dyn_payload){
1073                         payload_type_str = g_hash_table_lookup(p_conv_data->rtp_dyn_payload, &payload_type);
1074                         rtp_info->info_payload_type_str = payload_type_str;
1075                 }
1076         }
1077
1078         if ( check_col( pinfo->cinfo, COL_INFO) ) {
1079                 col_add_fstr( pinfo->cinfo, COL_INFO,
1080                     "PT=%s, SSRC=0x%X, Seq=%u, Time=%u%s",
1081                         payload_type_str ? payload_type_str : val_to_str( payload_type, rtp_payload_type_vals,"Unknown (%u)" ),
1082                     sync_src,
1083                     seq_num,
1084                     timestamp,
1085                     marker_set ? ", Mark " : " ");
1086         }
1087
1088
1089         if ( tree ) {
1090                 proto_tree *item;
1091                 /* Create RTP protocol tree */
1092                 ti = proto_tree_add_item(tree, proto_rtp, tvb, offset, -1, FALSE );
1093                 rtp_tree = proto_item_add_subtree(ti, ett_rtp );
1094
1095                 /* Conversation setup info */
1096                 if (global_rtp_show_setup_info)
1097                 {
1098                         show_setup_info(tvb, pinfo, rtp_tree);
1099                 }
1100
1101                 proto_tree_add_uint( rtp_tree, hf_rtp_version, tvb,
1102                     offset, 1, octet1 );
1103                 proto_tree_add_boolean( rtp_tree, hf_rtp_padding, tvb,
1104                     offset, 1, octet1 );
1105                 proto_tree_add_boolean( rtp_tree, hf_rtp_extension, tvb,
1106                     offset, 1, octet1 );
1107                 proto_tree_add_uint( rtp_tree, hf_rtp_csrc_count, tvb,
1108                     offset, 1, octet1 );
1109                 offset++;
1110
1111                 proto_tree_add_boolean( rtp_tree, hf_rtp_marker, tvb, offset,
1112                     1, octet2 );
1113
1114                 item = proto_tree_add_uint_format( rtp_tree, hf_rtp_payload_type, tvb,
1115                     offset, 1, octet2, "Payload type: %s (%u)",
1116                         payload_type_str ? payload_type_str : val_to_str( payload_type, rtp_payload_type_vals,"Unknown"),
1117                         payload_type);
1118
1119                 offset++;
1120
1121                 /* Sequence number 16 bits (2 octets) */
1122                 proto_tree_add_uint( rtp_tree, hf_rtp_seq_nr, tvb, offset, 2, seq_num );
1123                 if(p_conv_data != NULL) {
1124                         item = proto_tree_add_uint( rtp_tree, hf_rtp_ext_seq_nr, tvb, offset, 2, p_conv_data->extended_seqno );
1125                         PROTO_ITEM_SET_GENERATED(item);
1126                 }
1127                 offset += 2;
1128
1129                 /* Timestamp 32 bits (4 octets) */
1130                 proto_tree_add_uint( rtp_tree, hf_rtp_timestamp, tvb, offset, 4, timestamp );
1131                 offset += 4;
1132
1133                 /* Synchronization source identifier 32 bits (4 octets) */
1134                 proto_tree_add_uint( rtp_tree, hf_rtp_ssrc, tvb, offset, 4, sync_src );
1135                 offset += 4;
1136         } else {
1137                 offset += 12;
1138         }
1139         /* CSRC list*/
1140         if ( csrc_count > 0 ) {
1141                 if ( tree ) {
1142                         ti = proto_tree_add_item(rtp_tree, hf_rtp_csrc_items, tvb, offset,
1143                                                  csrc_count * 4, FALSE);
1144                         proto_item_append_text(ti, " (%u items)", csrc_count);
1145                         rtp_csrc_tree = proto_item_add_subtree( ti, ett_csrc_list );
1146                 }
1147                 for (i = 0; i < csrc_count; i++ ) {
1148                         csrc_item = tvb_get_ntohl( tvb, offset );
1149                         if ( tree ) proto_tree_add_uint_format( rtp_csrc_tree,
1150                             hf_rtp_csrc_item, tvb, offset, 4,
1151                             csrc_item,
1152                             "CSRC item %d: 0x%X",
1153                             i, csrc_item );
1154                         offset += 4;
1155                 }
1156         }
1157
1158         /* Optional RTP header extension */
1159         if ( extension_set ) {
1160                 /* Defined by profile field is 16 bits (2 octets) */
1161                 if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_prof_define, tvb, offset, 2, tvb_get_ntohs( tvb, offset ) );
1162                 offset += 2;
1163
1164                 hdr_extension = tvb_get_ntohs( tvb, offset );
1165                 if ( tree ) proto_tree_add_uint( rtp_tree, hf_rtp_length, tvb, offset, 2, hdr_extension);
1166                 offset += 2;
1167                 if ( hdr_extension > 0 ) {
1168                         if ( tree ) {
1169                                 ti = proto_tree_add_item(rtp_tree, hf_rtp_hdr_exts, tvb, offset, hdr_extension * 4, FALSE);
1170                                 rtp_hext_tree = proto_item_add_subtree( ti, ett_hdr_ext );
1171                         }
1172
1173                         /* pass interpretation of header extension to a registered subdissector */
1174                         newtvb = tvb_new_subset(tvb, offset, hdr_extension * 4, hdr_extension * 4);
1175                         if ( !(rtp_info->info_payload_type_str && dissector_try_string(rtp_hdr_ext_dissector_table,
1176                                 rtp_info->info_payload_type_str, newtvb, pinfo, rtp_hext_tree)) ) {
1177                                 for ( i = 0; i < hdr_extension; i++ ) {
1178                                         if ( tree ) proto_tree_add_uint( rtp_hext_tree, hf_rtp_hdr_ext, tvb, offset, 4, tvb_get_ntohl( tvb, offset ) );
1179                                 }
1180                         }
1181                         offset += hdr_extension * 4;
1182                 }
1183         }
1184
1185         if ( padding_set ) {
1186                 /*
1187                  * This RTP frame has padding - find it.
1188                  *
1189                  * The padding count is found in the LAST octet of
1190                  * the packet; it contains the number of octets
1191                  * that can be ignored at the end of the packet.
1192                  */
1193                 if (tvb_length(tvb) < tvb_reported_length(tvb)) {
1194                         /*
1195                          * We don't *have* the last octet of the
1196                          * packet, so we can't get the padding
1197                          * count.
1198                          *
1199                          * Put an indication of that into the
1200                          * tree, and just put in a raw data
1201                          * item.
1202                          */
1203                         if ( tree ) proto_tree_add_text(rtp_tree, tvb, 0, 0,
1204                             "Frame has padding, but not all the frame data was captured");
1205                         call_dissector(data_handle,
1206                             tvb_new_subset(tvb, offset, -1, -1),
1207                             pinfo, rtp_tree);
1208                         return;
1209                 }
1210
1211                 padding_count = tvb_get_guint8( tvb,
1212                     tvb_reported_length( tvb ) - 1 );
1213                 data_len =
1214                     tvb_reported_length_remaining( tvb, offset ) - padding_count;
1215
1216                 rtp_info->info_payload_offset = offset;
1217                 rtp_info->info_payload_len = tvb_length_remaining(tvb, offset);
1218                 rtp_info->info_padding_count = padding_count;
1219
1220                 if (data_len > 0) {
1221                         /*
1222                          * There's data left over when you take out
1223                          * the padding; dissect it.
1224                          */
1225                         dissect_rtp_data( tvb, pinfo, tree, rtp_tree,
1226                             offset,
1227                             data_len,
1228                             data_len,
1229                             payload_type );
1230                         offset += data_len;
1231                 } else if (data_len < 0) {
1232                         /*
1233                          * The padding count is bigger than the
1234                          * amount of RTP payload in the packet!
1235                          * Clip the padding count.
1236                          *
1237                          * XXX - put an item in the tree to indicate
1238                          * that the padding count is bogus?
1239                          */
1240                         padding_count =
1241                             tvb_reported_length_remaining(tvb, offset);
1242                 }
1243                 if (padding_count > 1) {
1244                         /*
1245                          * There's more than one byte of padding;
1246                          * show all but the last byte as padding
1247                          * data.
1248                          */
1249                         if ( tree ) proto_tree_add_item( rtp_tree, hf_rtp_padding_data,
1250                             tvb, offset, padding_count - 1, FALSE );
1251                         offset += padding_count - 1;
1252                 }
1253                 /*
1254                  * Show the last byte in the PDU as the padding
1255                  * count.
1256                  */
1257                 if ( tree ) proto_tree_add_item( rtp_tree, hf_rtp_padding_count,
1258                     tvb, offset, 1, FALSE );
1259         }
1260         else {
1261                 /*
1262                  * No padding.
1263                  */
1264                 dissect_rtp_data( tvb, pinfo, tree, rtp_tree, offset,
1265                     tvb_length_remaining( tvb, offset ),
1266                     tvb_reported_length_remaining( tvb, offset ),
1267                     payload_type );
1268                 rtp_info->info_payload_offset = offset;
1269                 rtp_info->info_payload_len = tvb_length_remaining(tvb, offset);
1270         }
1271         if (!pinfo->in_error_pkt)
1272                 tap_queue_packet(rtp_tap, pinfo, rtp_info);
1273 }
1274
1275
1276 /* calculate the extended sequence number - top 16 bits of the previous sequence number,
1277  * plus our own; then correct for wrapping */
1278 static guint32 calculate_extended_seqno(guint32 previous_seqno, guint16 raw_seqno)
1279 {
1280         guint32 seqno = (previous_seqno & 0xffff0000) | raw_seqno;
1281         if(seqno + 0x8000 < previous_seqno) {
1282                 seqno += 0x10000;
1283         } else if(previous_seqno + 0x8000 < seqno) {
1284                 /* we got an out-of-order packet which happened to go backwards over the
1285                  * wrap boundary */
1286                 seqno -= 0x10000;
1287         }
1288         return seqno;
1289 }
1290
1291 /* Look for conversation info */
1292 static void get_conv_info(packet_info *pinfo, struct _rtp_info *rtp_info)
1293 {
1294         /* Conversation and current data */
1295         conversation_t *p_conv = NULL;
1296         struct _rtp_conversation_info *p_conv_data = NULL;
1297
1298         /* Use existing packet info if available */
1299         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
1300
1301         if (!p_conv_data)
1302         {
1303                 /* First time, get info from conversation */
1304                 p_conv = find_conversation(pinfo->fd->num, &pinfo->net_dst, &pinfo->net_src,
1305                                            pinfo->ptype,
1306                                            pinfo->destport, pinfo->srcport, NO_ADDR_B);
1307                 if (p_conv)
1308                 {
1309                         /* Create space for packet info */
1310                         struct _rtp_conversation_info *p_conv_packet_data;
1311                         p_conv_data = conversation_get_proto_data(p_conv, proto_rtp);
1312
1313                         if (p_conv_data) {
1314                                 guint32 seqno;
1315
1316                                 /* Save this conversation info into packet info */
1317                                 p_conv_packet_data = se_alloc(sizeof(struct _rtp_conversation_info));
1318                                 g_snprintf(p_conv_packet_data->method, MAX_RTP_SETUP_METHOD_SIZE+1, "%s", p_conv_data->method);
1319                                 p_conv_packet_data->method[MAX_RTP_SETUP_METHOD_SIZE]='\0';
1320                                 p_conv_packet_data->frame_number = p_conv_data->frame_number;
1321                                 p_conv_packet_data->rtp_dyn_payload = p_conv_data->rtp_dyn_payload;
1322                                 p_conv_packet_data->rtp_conv_info = p_conv_data->rtp_conv_info;
1323                                 p_conv_packet_data->srtp_info = p_conv_data->srtp_info;
1324                                 p_add_proto_data(pinfo->fd, proto_rtp, p_conv_packet_data);
1325
1326                                 /* calculate extended sequence number */
1327                                 seqno = calculate_extended_seqno(p_conv_data->extended_seqno,
1328                                                                  rtp_info->info_seq_num);
1329
1330                                 p_conv_packet_data->extended_seqno = seqno;
1331                                 p_conv_data->extended_seqno = seqno;
1332                         }
1333                 }
1334         }
1335         if (p_conv_data) rtp_info->info_setup_frame_num = p_conv_data->frame_number;
1336 }
1337
1338
1339 /* Display setup info */
1340 static void show_setup_info(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1341 {
1342         /* Conversation and current data */
1343         struct _rtp_conversation_info *p_conv_data = NULL;
1344                 proto_tree *rtp_setup_tree;
1345         proto_item *ti;
1346
1347         /* Use existing packet info if available */
1348         p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
1349
1350         if (!p_conv_data) return;
1351
1352         /* Create setup info subtree with summary info. */
1353         ti =  proto_tree_add_string_format(tree, hf_rtp_setup, tvb, 0, 0,
1354                                                                "",
1355                                                                "Stream setup by %s (frame %u)",
1356                                                                p_conv_data->method,
1357                                                                p_conv_data->frame_number);
1358                 PROTO_ITEM_SET_GENERATED(ti);
1359                 rtp_setup_tree = proto_item_add_subtree(ti, ett_rtp_setup);
1360                 if (rtp_setup_tree)
1361                 {
1362                         /* Add details into subtree */
1363                         proto_item* item = proto_tree_add_uint(rtp_setup_tree, hf_rtp_setup_frame,
1364                                                                tvb, 0, 0, p_conv_data->frame_number);
1365                         PROTO_ITEM_SET_GENERATED(item);
1366                         item = proto_tree_add_string(rtp_setup_tree, hf_rtp_setup_method,
1367                                                      tvb, 0, 0, p_conv_data->method);
1368                         PROTO_ITEM_SET_GENERATED(item);
1369                 }
1370 }
1371
1372 /* Dissect PacketCable CCC header */
1373
1374 static void
1375 dissect_pkt_ccc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1376 {
1377         proto_item *ti            = NULL;
1378         proto_tree *pkt_ccc_tree      = NULL;
1379         const guint8 *ptime = tvb_get_ptr(tvb, 4, 8);
1380
1381         if ( tree ) {
1382                 ti = proto_tree_add_item(tree, proto_pkt_ccc, tvb, 0, 12, FALSE);
1383                 pkt_ccc_tree = proto_item_add_subtree(ti, ett_pkt_ccc);
1384
1385                 proto_tree_add_item(pkt_ccc_tree, hf_pkt_ccc_id, tvb, 0, 4, FALSE);
1386                 proto_tree_add_bytes_format(pkt_ccc_tree, hf_pkt_ccc_ts, tvb,
1387                     4, 8, "NTP timestamp: %s", ntp_fmt_ts(ptime));
1388         }
1389
1390         dissect_rtp(tvb, pinfo, tree);
1391 }
1392
1393
1394 /* Register PacketCable CCC */
1395
1396 void
1397 proto_register_pkt_ccc(void)
1398 {
1399         static hf_register_info hf[] =
1400         {
1401                 {
1402                         &hf_pkt_ccc_id,
1403                         {
1404                                 "PacketCable CCC Identifier",
1405                                 "pkt_ccc.ccc_id",
1406                                 FT_UINT32,
1407                                 BASE_DEC,
1408                                 NULL,
1409                                 0x0,
1410                                 "CCC_ID", HFILL
1411                         }
1412                 },
1413                 {
1414                         &hf_pkt_ccc_ts,
1415                         {
1416                                 "PacketCable CCC Timestamp",
1417                                 "pkt_ccc.ts",
1418                                 FT_BYTES,
1419                                 BASE_NONE,
1420                                 NULL,
1421                                 0x0,
1422                                 "Timestamp", HFILL
1423                         }
1424                 },
1425
1426         };
1427
1428         static gint *ett[] =
1429         {
1430                 &ett_pkt_ccc,
1431         };
1432
1433         module_t *pkt_ccc_module;
1434
1435
1436         proto_pkt_ccc = proto_register_protocol("PacketCable Call Content Connection",
1437             "PKT CCC", "pkt_ccc");
1438         proto_register_field_array(proto_pkt_ccc, hf, array_length(hf));
1439         proto_register_subtree_array(ett, array_length(ett));
1440
1441         register_dissector("pkt_ccc", dissect_pkt_ccc, proto_pkt_ccc);
1442
1443         pkt_ccc_module = prefs_register_protocol(proto_pkt_ccc, NULL);
1444
1445         prefs_register_uint_preference(pkt_ccc_module, "udp_port",
1446                                        "UDP port",
1447                                        "Decode packets on this UDP port as PacketCable CCC",
1448                                        10, &global_pkt_ccc_udp_port);
1449 }
1450
1451 void
1452 proto_reg_handoff_pkt_ccc(void)
1453 {
1454         /*
1455          * Register this dissector as one that can be selected by a
1456          * UDP port number.
1457          */
1458         pkt_ccc_handle = find_dissector("pkt_ccc");
1459         dissector_add_handle("udp.port", pkt_ccc_handle);
1460 }
1461
1462 /* Register RTP */
1463
1464 void
1465 proto_register_rtp(void)
1466 {
1467         static hf_register_info hf[] =
1468         {
1469                 {
1470                         &hf_rtp_version,
1471                         {
1472                                 "Version",
1473                                 "rtp.version",
1474                                 FT_UINT8,
1475                                 BASE_DEC,
1476                                 VALS(rtp_version_vals),
1477                                 0xC0,
1478                                 "", HFILL
1479                         }
1480                 },
1481                 {
1482                         &hf_rtp_padding,
1483                         {
1484                                 "Padding",
1485                                 "rtp.padding",
1486                                 FT_BOOLEAN,
1487                                 8,
1488                                 NULL,
1489                                 0x20,
1490                                 "", HFILL
1491                         }
1492                 },
1493                 {
1494                         &hf_rtp_extension,
1495                         {
1496                                 "Extension",
1497                                 "rtp.ext",
1498                                 FT_BOOLEAN,
1499                                 8,
1500                                 NULL,
1501                                 0x10,
1502                                 "", HFILL
1503                         }
1504                 },
1505                 {
1506                         &hf_rtp_csrc_count,
1507                         {
1508                                 "Contributing source identifiers count",
1509                                 "rtp.cc",
1510                                 FT_UINT8,
1511                                 BASE_DEC,
1512                                 NULL,
1513                                 0x0F,
1514                                 "", HFILL
1515                         }
1516                 },
1517                 {
1518                         &hf_rtp_marker,
1519                         {
1520                                 "Marker",
1521                                 "rtp.marker",
1522                                 FT_BOOLEAN,
1523                                 8,
1524                                 NULL,
1525                                 0x80,
1526                                 "", HFILL
1527                         }
1528                 },
1529                 {
1530                         &hf_rtp_payload_type,
1531                         {
1532                                 "Payload type",
1533                                 "rtp.p_type",
1534                                 FT_UINT8,
1535                                 BASE_DEC,
1536                                 NULL,
1537                                 0x7F,
1538                                 "", HFILL
1539                         }
1540                 },
1541                 {
1542                         &hf_rtp_seq_nr,
1543                         {
1544                                 "Sequence number",
1545                                 "rtp.seq",
1546                                 FT_UINT16,
1547                                 BASE_DEC,
1548                                 NULL,
1549                                 0x0,
1550                                 "", HFILL
1551                         }
1552                 },
1553                 {
1554                         &hf_rtp_ext_seq_nr,
1555                         {
1556                                 "Extended sequence number",
1557                                 "rtp.extseq",
1558                                 FT_UINT32,
1559                                 BASE_DEC,
1560                                 NULL,
1561                                 0x0,
1562                                 "", HFILL
1563                         }
1564                 },
1565                 {
1566                         &hf_rtp_timestamp,
1567                         {
1568                                 "Timestamp",
1569                                 "rtp.timestamp",
1570                                 FT_UINT32,
1571                                 BASE_DEC,
1572                                 NULL,
1573                                 0x0,
1574                                 "", HFILL
1575                         }
1576                 },
1577                 {
1578                         &hf_rtp_ssrc,
1579                         {
1580                                 "Synchronization Source identifier",
1581                                 "rtp.ssrc",
1582                                 FT_UINT32,
1583                                 BASE_HEX_DEC,
1584                                 NULL,
1585                                 0x0,
1586                                 "", HFILL
1587                         }
1588                 },
1589                 {
1590                         &hf_rtp_prof_define,
1591                         {
1592                                 "Defined by profile",
1593                                 "rtp.ext.profile",
1594                                 FT_UINT16,
1595                                 BASE_DEC,
1596                                 NULL,
1597                                 0x0,
1598                                 "", HFILL
1599                         }
1600                 },
1601                 {
1602                         &hf_rtp_length,
1603                         {
1604                                 "Extension length",
1605                                 "rtp.ext.len",
1606                                 FT_UINT16,
1607                                 BASE_DEC,
1608                                 NULL,
1609                                 0x0,
1610                                 "", HFILL
1611                         }
1612                 },
1613                 {
1614                         &hf_rtp_csrc_items,
1615                         {
1616                                 "Contributing Source identifiers",
1617                                 "rtp.csrc.items",
1618                                 FT_NONE,
1619                                 BASE_NONE,
1620                                 NULL,
1621                                 0x0,
1622                                 "", HFILL
1623                         }
1624                 },
1625                 {
1626                         &hf_rtp_csrc_item,
1627                         {
1628                                 "CSRC item",
1629                                 "rtp.csrc.item",
1630                                 FT_UINT32,
1631                                 BASE_HEX_DEC,
1632                                 NULL,
1633                                 0x0,
1634                                 "", HFILL
1635                         }
1636                 },
1637                 {
1638                         &hf_rtp_hdr_exts,
1639                         {
1640                                 "Header extensions",
1641                                 "rtp.hdr_exts",
1642                                 FT_NONE,
1643                                 BASE_NONE,
1644                                 NULL,
1645                                 0x0,
1646                                 "", HFILL
1647                         }
1648                 },
1649                 {
1650                         &hf_rtp_hdr_ext,
1651                         {
1652                                 "Header extension",
1653                                 "rtp.hdr_ext",
1654                                 FT_UINT32,
1655                                 BASE_DEC,
1656                                 NULL,
1657                                 0x0,
1658                                 "", HFILL
1659                         }
1660                 },
1661                 {
1662                         &hf_rtp_data,
1663                         {
1664                                 "Payload",
1665                                 "rtp.payload",
1666                                 FT_BYTES,
1667                                 BASE_HEX,
1668                                 NULL,
1669                                 0x0,
1670                                 "", HFILL
1671                         }
1672                 },
1673                 {
1674                         &hf_rtp_padding_data,
1675                         {
1676                                 "Padding data",
1677                                 "rtp.padding.data",
1678                                 FT_BYTES,
1679                                 BASE_HEX,
1680                                 NULL,
1681                                 0x0,
1682                                 "", HFILL
1683                         }
1684                 },
1685                 {
1686                         &hf_rtp_padding_count,
1687                         {
1688                                 "Padding count",
1689                                 "rtp.padding.count",
1690                                 FT_UINT8,
1691                                 BASE_DEC,
1692                                 NULL,
1693                                 0x0,
1694                                 "", HFILL
1695                         }
1696                 },
1697                 {
1698                         &hf_rtp_setup,
1699                         {
1700                                 "Stream setup",
1701                                 "rtp.setup",
1702                                 FT_STRING,
1703                                 BASE_NONE,
1704                                 NULL,
1705                                 0x0,
1706                                 "Stream setup, method and frame number", HFILL
1707                         }
1708                 },
1709                 {
1710                         &hf_rtp_setup_frame,
1711                         {
1712                                 "Setup frame",
1713                                 "rtp.setup-frame",
1714                                 FT_FRAMENUM,
1715                                 BASE_NONE,
1716                                 NULL,
1717                                 0x0,
1718                                 "Frame that set up this stream", HFILL
1719                         }
1720                 },
1721                 {
1722                         &hf_rtp_setup_method,
1723                         {
1724                                 "Setup Method",
1725                                 "rtp.setup-method",
1726                                 FT_STRING,
1727                                 BASE_NONE,
1728                                 NULL,
1729                                 0x0,
1730                                 "Method used to set up this stream", HFILL
1731                         }
1732                 },
1733                 {
1734                         &hf_rtp_rfc2198_follow,
1735                         {
1736                                 "Follow",
1737                                 "rtp.follow",
1738                                 FT_BOOLEAN,
1739                                 8,
1740                                 TFS(&flags_set_truth),
1741                                 0x80,
1742                                 "Next header follows", HFILL
1743                         }
1744                 },
1745                 {
1746                         &hf_rtp_rfc2198_tm_off,
1747                         {
1748                                 "Timestamp offset",
1749                                 "rtp.timestamp-offset",
1750                                 FT_UINT16,
1751                                 BASE_DEC,
1752                                 NULL,
1753                                 0xFFFC,
1754                                 "Timestamp Offset", HFILL
1755                         }
1756                 },
1757                 {
1758                         &hf_rtp_rfc2198_bl_len,
1759                         {
1760                                 "Block length",
1761                                 "rtp.block-length",
1762                                 FT_UINT16,
1763                                 BASE_DEC,
1764                                 NULL,
1765                                 0x03FF,
1766                                 "Block Length", HFILL
1767                         }
1768                 },
1769
1770                 /* reassembly stuff */
1771                 {&hf_rtp_fragments,
1772                  {"RTP Fragments", "rtp.fragments", FT_NONE, BASE_NONE, NULL, 0x0,
1773                   "RTP Fragments", HFILL }
1774                 },
1775
1776                 {&hf_rtp_fragment,
1777                  {"RTP Fragment data", "rtp.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
1778                   "RTP Fragment data", HFILL }
1779                 },
1780
1781                 {&hf_rtp_fragment_overlap,
1782                  {"Fragment overlap", "rtp.fragment.overlap", FT_BOOLEAN, BASE_NONE,
1783                   NULL, 0x0, "Fragment overlaps with other fragments", HFILL }
1784                 },
1785
1786                 {&hf_rtp_fragment_overlap_conflict,
1787                  {"Conflicting data in fragment overlap", "rtp.fragment.overlap.conflict",
1788                   FT_BOOLEAN, BASE_NONE, NULL, 0x0,
1789                   "Overlapping fragments contained conflicting data", HFILL }
1790                 },
1791
1792                 {&hf_rtp_fragment_multiple_tails,
1793                  {"Multiple tail fragments found", "rtp.fragment.multipletails",
1794                   FT_BOOLEAN, BASE_NONE, NULL, 0x0,
1795                   "Several tails were found when defragmenting the packet", HFILL }
1796                 },
1797
1798                 {&hf_rtp_fragment_too_long_fragment,
1799                  {"Fragment too long", "rtp.fragment.toolongfragment",
1800                   FT_BOOLEAN, BASE_NONE, NULL, 0x0,
1801                   "Fragment contained data past end of packet", HFILL }
1802                 },
1803
1804                 {&hf_rtp_fragment_error,
1805                  {"Defragmentation error", "rtp.fragment.error",
1806                   FT_FRAMENUM, BASE_NONE, NULL, 0x0,
1807                   "Defragmentation error due to illegal fragments", HFILL }
1808                 },
1809
1810                 {&hf_rtp_reassembled_in,
1811                  {"RTP fragment, reassembled in frame", "rtp.reassembled_in",
1812                   FT_FRAMENUM, BASE_NONE, NULL, 0x0,
1813                   "This RTP packet is reassembled in this frame", HFILL }
1814                 },
1815                 {&hf_srtp_encrypted_payload,
1816                  {"SRTP Encrypted Payload", "srtp.enc_payload",
1817                   FT_BYTES, BASE_NONE, NULL, 0x0,
1818                   "SRTP Encrypted Payload", HFILL }
1819                 },
1820                 {&hf_srtp_mki,
1821                  {"SRTP MKI", "srtp.mki",
1822                   FT_BYTES, BASE_NONE, NULL, 0x0,
1823                   "SRTP Master Key Index", HFILL }
1824                 },
1825                 {&hf_srtp_auth_tag,
1826                  {"SRTP Auth Tag", "srtp.auth_tag",
1827                   FT_BYTES, BASE_NONE, NULL, 0x0,
1828                   "SRTP Authentication Tag", HFILL }
1829                 }
1830
1831         };
1832
1833         static gint *ett[] =
1834         {
1835                 &ett_rtp,
1836                 &ett_csrc_list,
1837                 &ett_hdr_ext,
1838                 &ett_rtp_setup,
1839                 &ett_rtp_rfc2198,
1840                 &ett_rtp_rfc2198_hdr,
1841                 &ett_rtp_fragment,
1842                 &ett_rtp_fragments
1843         };
1844
1845         module_t *rtp_module;
1846
1847
1848         proto_rtp = proto_register_protocol("Real-Time Transport Protocol",
1849             "RTP", "rtp");
1850         proto_register_field_array(proto_rtp, hf, array_length(hf));
1851         proto_register_subtree_array(ett, array_length(ett));
1852
1853         register_dissector("rtp", dissect_rtp, proto_rtp);
1854         register_dissector("rtp.rfc2198", dissect_rtp_rfc2198, proto_rtp);
1855
1856         rtp_tap = register_tap("rtp");
1857
1858         rtp_pt_dissector_table = register_dissector_table("rtp.pt",
1859                                                           "RTP payload type", FT_UINT8, BASE_DEC);
1860         rtp_dyn_pt_dissector_table = register_dissector_table("rtp_dyn_payload_type",
1861                                                                                                     "Dynamic RTP payload type", FT_STRING, BASE_NONE);
1862
1863
1864         rtp_hdr_ext_dissector_table = register_dissector_table("rtp_hdr_ext",
1865                                                                                                         "RTP header extension", FT_STRING, BASE_NONE);
1866
1867         rtp_module = prefs_register_protocol(proto_rtp, proto_reg_handoff_rtp);
1868
1869         prefs_register_bool_preference(rtp_module, "show_setup_info",
1870                                        "Show stream setup information",
1871                                        "Where available, show which protocol and frame caused "
1872                                        "this RTP stream to be created",
1873                                        &global_rtp_show_setup_info);
1874
1875         prefs_register_bool_preference(rtp_module, "heuristic_rtp",
1876                                        "Try to decode RTP outside of conversations",
1877                                        "If call control SIP/H323/RTSP/.. messages are missing in the trace, "
1878                                        "RTP isn't decoded without this",
1879                                        &global_rtp_heur);
1880
1881         prefs_register_bool_preference(rtp_module, "desegment_rtp_streams",
1882                                        "Allow subdissector to reassemble RTP streams",
1883                                        "Whether subdissector can request RTP streams to be reassembled",
1884                                        &desegment_rtp);
1885
1886         prefs_register_enum_preference(rtp_module, "version0_type",
1887                                        "Treat RTP version 0 packets as",
1888                                        "If an RTP version 0 packet is encountered, it can be treated as an invalid packet, a STUN packet, or a T.38 packet",
1889                                        &global_rtp_version0_type,
1890                                        rtp_version0_types, FALSE);
1891     prefs_register_uint_preference(rtp_module,
1892                                    "rfc2198_payload_type", "Payload Type for RFC2198",
1893                                    "Payload Type for RFC2198 Redundant Audio Data",
1894                                    10,
1895                                    &rtp_rfc2198_pt);
1896
1897         register_init_routine(rtp_fragment_init);
1898 }
1899
1900 void
1901 proto_reg_handoff_rtp(void)
1902 {
1903         static gboolean rtp_prefs_initialized = FALSE;
1904
1905         data_handle = find_dissector("data");
1906         stun_handle = find_dissector("stun");
1907         t38_handle = find_dissector("t38");
1908         /*
1909          * Register this dissector as one that can be selected by a
1910          * UDP port number.
1911          */
1912         rtp_handle = find_dissector("rtp");
1913         rtp_rfc2198_handle = find_dissector("rtp.rfc2198");
1914
1915         dissector_add_handle("udp.port", rtp_handle);
1916
1917         dissector_add_string("rtp_dyn_payload_type", "red", rtp_rfc2198_handle);
1918
1919         if (rtp_prefs_initialized) {
1920                 dissector_delete("rtp.pt", rtp_saved_rfc2198_pt, rtp_rfc2198_handle);
1921         } else {
1922                 rtp_prefs_initialized = TRUE;
1923         }
1924         rtp_saved_rfc2198_pt = rtp_rfc2198_pt;
1925         dissector_add("rtp.pt", rtp_saved_rfc2198_pt, rtp_rfc2198_handle);
1926
1927         heur_dissector_add( "udp", dissect_rtp_heur, proto_rtp);
1928 }
1929
1930 /*
1931  * Local Variables:
1932  * c-basic-offset: 8
1933  * indent-tabs-mode: t
1934  * tab-width: 8
1935  * End:
1936  */