2 * Routines for ETSI Distribution & Communication Protocol
3 * Copyright 2006, British Broadcasting Corporation
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 * Ref: ETSI DCP (ETSI TS 102 821)
34 #include <epan/packet.h>
35 #include <epan/reassemble.h>
36 #include <epan/crcdrm.h>
37 #include <epan/reedsolomon.h>
38 #include <epan/emem.h>
41 /* forward reference */
43 static gboolean dissect_dcp_etsi (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree);
44 static void dissect_af (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree);
45 static void dissect_pft (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree);
46 static void dissect_tpl(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree);
48 static dissector_table_t dcp_dissector_table;
49 static dissector_table_t af_dissector_table;
50 static dissector_table_t tpl_dissector_table;
52 static int proto_dcp_etsi = -1;
53 static int proto_af = -1;
54 static int proto_pft = -1;
55 static int proto_tpl = -1;
56 static int hf_edcp_sync = -1;
57 static int hf_edcp_len = -1;
58 static int hf_edcp_seq = -1;
59 static int hf_edcp_crcflag = -1;
60 static int hf_edcp_maj = -1;
61 static int hf_edcp_min = -1;
62 static int hf_edcp_pt = -1;
63 static int hf_edcp_crc = -1;
64 static int hf_edcp_crc_ok = -1;
65 static int hf_edcp_pft_pt = -1;
66 static int hf_edcp_pseq = -1;
67 static int hf_edcp_findex = -1;
68 static int hf_edcp_fcount = -1;
69 static int hf_edcp_fecflag = -1;
70 static int hf_edcp_addrflag = -1;
71 static int hf_edcp_plen = -1;
72 static int hf_edcp_rsk = -1;
73 static int hf_edcp_rsz = -1;
74 static int hf_edcp_source = -1;
75 static int hf_edcp_dest = -1;
76 static int hf_edcp_hcrc = -1;
77 static int hf_edcp_hcrc_ok = -1;
78 static int hf_edcp_c_max = -1;
79 static int hf_edcp_rx_min = -1;
80 static int hf_edcp_rs_corrected = -1;
81 static int hf_edcp_rs_ok = -1;
82 static int hf_edcp_pft_payload = -1;
84 static int hf_tpl_tlv = -1;
85 static int hf_tpl_ptr = -1;
87 static int hf_edcp_fragments = -1;
88 static int hf_edcp_fragment = -1;
89 static int hf_edcp_fragment_overlap = -1;
90 static int hf_edcp_fragment_overlap_conflicts = -1;
91 static int hf_edcp_fragment_multiple_tails = -1;
92 static int hf_edcp_fragment_too_long_fragment = -1;
93 static int hf_edcp_fragment_error = -1;
94 static int hf_edcp_reassembled_in = -1;
96 /* Initialize the subtree pointers */
97 static gint ett_edcp = -1;
98 static gint ett_af = -1;
99 static gint ett_pft = -1;
100 static gint ett_tpl = -1;
101 static gint ett_edcp_fragment = -1;
102 static gint ett_edcp_fragments = -1;
104 static GHashTable *dcp_fragment_table = NULL;
105 static GHashTable *dcp_reassembled_table = NULL;
107 static const fragment_items dcp_frag_items = {
108 /* Fragment subtrees */
111 /* Fragment fields */
114 &hf_edcp_fragment_overlap,
115 &hf_edcp_fragment_overlap_conflicts,
116 &hf_edcp_fragment_multiple_tails,
117 &hf_edcp_fragment_too_long_fragment,
118 &hf_edcp_fragment_error,
119 /* Reassembled in field */
120 &hf_edcp_reassembled_in,
125 /** initialise the DCP protocol. Details follow
129 dcp_init_protocol(void)
131 fragment_table_init (&dcp_fragment_table);
132 reassembled_table_init (&dcp_reassembled_table);
136 /** Dissect a DCP packet. Details follow
138 * \param[in,out] tvb The buffer containing the packet
139 * \param[in,out] pinfo The packet info structure
140 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
144 dissect_dcp_etsi (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
147 proto_tree *dcp_tree = NULL;
149 /* 6.1 AF packet structure
153 * 2 bytes 4 bytes 2 bytes 1 byte 1 byte
155 * SYNC: two-byte ASCII representation of "AF".
156 * LEN: length of the payload, in bytes.
157 * SEQ: sequence number
158 * AR: AF protocol Revision - a field combining the CF, MAJ and MIN fields
159 * CF: CRC Flag, 0 if the CRC field is not used
160 * MAJ: major revision of the AF protocol in use, see clause 6.2.
161 * MIN: minor revision of the AF protocol in use, see clause 6.2.
162 * Protocol Type (PT): single byte encoding the protocol of the data carried in the payload. For TAG Packets, the value
163 * shall be the ASCII representation of "T".
165 * 7.1 PFT fragment structure
167 * 14, 16, 18 or 20 bytes (depending on options) Optional present if FEC=1 Optional present if Addr = 1
168 * Psync Pseq Findex Fcount FEC HCRC Addr Plen | RSk RSz | Source Dest
169 * 16 bits 16 bits 24 bits 24 bits 1 bit 16 bits 1 bit 14 bits | 8 bits 8 bits | 16 bits 16 bits
171 * Psync: the ASCII string "PF" is used as the synchronization word for the PFT Layer
173 * Don't accept this packet unless at least a full AF header present(10 bytes).
174 * It should be possible to strengthen the heuristic further if need be.
176 if(tvb_length(tvb) < 11)
179 sync = tvb_get_ephemeral_string (tvb, 0, 2);
180 if((sync[0]!='A' && sync[0]!='P') || sync[1]!='F')
183 pinfo->current_proto = "DCP (ETSI)";
185 /* Clear out stuff in the info column */
186 col_clear(pinfo->cinfo, COL_INFO);
187 col_set_str (pinfo->cinfo, COL_PROTOCOL, "DCP (ETSI)");
188 /*col_append_fstr (pinfo->cinfo, COL_INFO, " tvb %d", tvb_length(tvb));*/
191 proto_item *ti = NULL;
192 ti = proto_tree_add_item (tree, proto_dcp_etsi, tvb, 0, -1, FALSE);
193 dcp_tree = proto_item_add_subtree (ti, ett_edcp);
196 dissector_try_string(dcp_dissector_table, (char*)sync, tvb, pinfo, dcp_tree);
200 #define PFT_RS_N_MAX 207
202 #define PFT_RS_P (PFT_RS_K - PFT_RS_N_MAX)
206 void rs_deinterleave(const guint8 *input, guint8 *output, guint16 plen, guint32 fcount)
209 for(fidx=0; fidx<fcount; fidx++)
212 for (r=0; r<plen; r++)
214 output[fidx+r*fcount] = input[fidx*plen+r];
220 gboolean rs_correct_data(guint8 *deinterleaved, guint8 *output,
221 guint32 c_max, guint16 rsk, guint16 rsz _U_)
223 guint32 i, index_coded = 0, index_out = 0;
225 for (i=0; i<c_max; i++)
227 memcpy(output+index_out, deinterleaved+index_coded, rsk);
229 memcpy(output+index_out+PFT_RS_N_MAX, deinterleaved+index_coded, PFT_RS_P);
230 index_coded += PFT_RS_P;
231 err_corr = eras_dec_rs(output+index_out, NULL, 0);
240 /* Don't attempt reassembly if we have a huge number of fragments. */
241 #define MAX_FRAGMENTS ((1 * 1024 * 1024) / sizeof(guint32))
244 dissect_pft_fec_detailed(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
256 guint16 decoded_size;
259 gboolean first, last;
260 tvbuff_t *new_tvb=NULL;
262 if (fcount > MAX_FRAGMENTS) {
264 proto_tree_add_text(tree, tvb , 0, -1, "[Reassembly of %d fragments not attempted]", fcount);
269 last = fcount == (findex+1);
270 decoded_size = fcount*plen;
271 c_max = fcount*plen/(rsk+PFT_RS_P); /* rounded down */
272 rx_min = c_max*rsk/plen;
273 if(rx_min*plen<c_max*rsk)
276 new_tvb = process_reassembled_data (tvb, offset, pinfo,
277 "Reassembled Message",
278 fdx, &dcp_frag_items,
284 fragment_data *fd_head;
287 proto_tree_add_text (tree, tvb, 0, -1, "want %d, got %d need %d",
288 fcount, fragments, rx_min
290 got = ep_alloc(fcount*sizeof(guint32));
292 /* make a list of the findex (offset) numbers of the fragments we have */
293 fd = fragment_get(pinfo, seq, dcp_fragment_table);
294 for (fd_head = fd; fd_head != NULL; fd_head = fd_head->next) {
296 got[fragments++] = fd_head->offset; /* this is the findex of the fragment */
299 /* put a sentinel at the end */
300 got[fragments++] = fcount;
301 /* have we got enough for Reed Solomon to try to correct ? */
302 if(fragments>=rx_min) { /* yes, in theory */
303 guint i,current_findex;
304 fragment_data *frag=NULL;
305 guint8 *dummy_data = (guint8*) ep_alloc0 (plen);
306 tvbuff_t *dummytvb = tvb_new_real_data(dummy_data, plen, plen);
307 /* try and decode with missing fragments */
309 proto_tree_add_text (tree, tvb, 0, -1, "want %d, got %d need %d",
310 fcount, fragments, rx_min
312 /* fill the fragment table with empty fragments */
314 for(i=0; i<fragments; i++) {
315 guint next_fragment_we_have = got[i];
316 if (next_fragment_we_have > MAX_FRAGMENTS) {
318 proto_tree_add_text(tree, tvb , 0, -1, "[Reassembly of %d fragments not attempted]", next_fragment_we_have);
321 for(; current_findex<next_fragment_we_have; current_findex++) {
322 frag = fragment_add_seq_check (dummytvb, 0, pinfo, seq,
323 dcp_fragment_table, dcp_reassembled_table,
324 current_findex, plen, (current_findex+1!=fcount));
326 current_findex++; /* skip over the fragment we have */
329 new_tvb = process_reassembled_data (tvb, offset, pinfo,
330 "Reassembled Message",
331 frag, &dcp_frag_items,
336 gboolean decoded = TRUE;
337 tvbuff_t *dtvb = NULL;
338 const guint8 *input = tvb_get_ptr(new_tvb, 0, -1);
339 guint16 reassembled_size = tvb_length(new_tvb);
340 guint8 *deinterleaved = (guint8*) g_malloc (reassembled_size);
341 guint8 *output = (guint8*) g_malloc (decoded_size);
342 rs_deinterleave(input, deinterleaved, plen, fcount);
344 dtvb = tvb_new_child_real_data(tvb, deinterleaved, reassembled_size, reassembled_size);
345 add_new_data_source(pinfo, dtvb, "Deinterleaved");
346 tvb_set_free_cb(dtvb, g_free);
348 decoded = rs_correct_data(deinterleaved, output, c_max, rsk, rsz);
350 proto_tree_add_boolean (tree, hf_edcp_rs_ok, tvb, offset, 2, decoded);
352 new_tvb = tvb_new_child_real_data(dtvb, output, decoded_size, decoded_size);
353 add_new_data_source(pinfo, new_tvb, "RS Error Corrected Data");
354 tvb_set_free_cb(new_tvb, g_free);
360 /** Handle a PFT packet which has the fragmentation header. This uses the
361 * standard wireshark methods for reassembling fragments. If FEC is used,
362 * the FEC is handled too. For the moment, all the fragments must be
363 * available but this could be improved.
364 * \param[in,out] tvb The buffer containing the current fragment
365 * \param[in,out] pinfo The packet info structure
366 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
367 * \param[in] findex the fragment count
368 * \param[in] fcount the number of fragments
369 * \param[in] seq the sequence number of the reassembled packet
370 * \param[in] offset the offset into the tvb of the fragment
371 * \param[in] plen the length of each fragment
372 * \param[in] fec is fec used
373 * \param[in] rsk the number of useful bytes in each chunk
374 * \param[in] rsz the number of padding bytes in each chunk
377 dissect_pft_fragmented(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
388 gboolean first, last;
389 tvbuff_t *new_tvb=NULL;
390 fragment_data *frag_edcp = NULL;
391 pinfo->fragmented = TRUE;
393 last = fcount == (findex+1);
394 frag_edcp = fragment_add_seq_check (
397 dcp_fragment_table, dcp_reassembled_table,
402 new_tvb = dissect_pft_fec_detailed(
403 tvb, pinfo, tree, findex, fcount, seq, offset, plen, fec, rsk, rsz, frag_edcp
406 new_tvb = process_reassembled_data (tvb, offset, pinfo,
407 "Reassembled Message",
408 frag_edcp, &dcp_frag_items,
411 if (check_col (pinfo->cinfo, COL_INFO)) {
413 col_append_str (pinfo->cinfo, COL_INFO, " (Message Reassembled)");
416 col_append_str (pinfo->cinfo, COL_INFO, " (Message Reassembly failure)");
418 col_append_fstr (pinfo->cinfo, COL_INFO, " (Message fragment %u)", findex);
422 col_append_str (pinfo->cinfo, COL_INFO, " (first)");
424 col_append_str (pinfo->cinfo, COL_INFO, " (last)");
429 /** Dissect a PFT packet. Details follow
431 * \param[in,out] tvb The buffer containing the packet
432 * \param[in,out] pinfo The packet info structure
433 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
436 dissect_pft(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
440 guint16 seq, payload_len, hcrc;
441 guint32 findex, fcount;
442 proto_tree *pft_tree = NULL;
443 proto_item *ti = NULL, *li = NULL;
444 tvbuff_t *next_tvb = NULL;
445 gboolean fec = FALSE;
446 guint16 rsk=0, rsz=0;
448 pinfo->current_proto = "DCP-PFT";
449 col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCP-PFT");
451 if (tree) { /* we are being asked for details */
452 ti = proto_tree_add_item (tree, proto_pft, tvb, 0, -1, FALSE);
453 pft_tree = proto_item_add_subtree (ti, ett_pft);
454 proto_tree_add_item (pft_tree, hf_edcp_sync, tvb, offset, 2, FALSE);
457 seq = tvb_get_ntohs (tvb, offset);
459 proto_tree_add_item (pft_tree, hf_edcp_pseq, tvb, offset, 2, FALSE);
462 findex = tvb_get_ntoh24 (tvb, offset);
464 proto_tree_add_item (pft_tree, hf_edcp_findex, tvb, offset, 3, FALSE);
467 fcount = tvb_get_ntoh24 (tvb, offset);
469 proto_tree_add_item (pft_tree, hf_edcp_fcount, tvb, offset, 3, FALSE);
472 plen = tvb_get_ntohs (tvb, offset);
473 payload_len = plen & 0x3fff;
475 proto_tree_add_item (pft_tree, hf_edcp_fecflag, tvb, offset, 2, FALSE);
476 proto_tree_add_item (pft_tree, hf_edcp_addrflag, tvb, offset, 2, FALSE);
477 li = proto_tree_add_item (pft_tree, hf_edcp_plen, tvb, offset, 2, FALSE);
482 rsk = tvb_get_guint8 (tvb, offset);
484 proto_tree_add_item (pft_tree, hf_edcp_rsk, tvb, offset, 1, FALSE);
486 rsz = tvb_get_guint8 (tvb, offset);
488 proto_tree_add_item (pft_tree, hf_edcp_rsz, tvb, offset, 1, FALSE);
493 proto_tree_add_item (pft_tree, hf_edcp_source, tvb, offset, 2, FALSE);
496 proto_tree_add_item (pft_tree, hf_edcp_dest, tvb, offset, 2, FALSE);
500 proto_item *ci = NULL;
501 guint header_len = offset+2;
502 const char *crc_buf = (const char *) tvb_get_ptr(tvb, 0, header_len);
503 unsigned long c = crc_drm(crc_buf, header_len, 16, 0x11021, 1);
504 ci = proto_tree_add_item (pft_tree, hf_edcp_hcrc, tvb, offset, 2, FALSE);
505 proto_item_append_text(ci, " (%s)", (c==0xe2f0)?"Ok":"bad");
506 proto_tree_add_boolean(pft_tree, hf_edcp_hcrc_ok, tvb, offset, 2, c==0xe2f0);
508 hcrc = tvb_get_ntohs (tvb, offset);
510 if (fcount > 1) { /* fragmented*/
511 gboolean save_fragmented = pinfo->fragmented;
512 guint16 real_len = tvb_length(tvb)-offset;
513 proto_tree_add_item (pft_tree, hf_edcp_pft_payload, tvb, offset, real_len, FALSE);
514 if(real_len != payload_len) {
516 proto_item_append_text(li, " (length error (%d))", real_len);
518 next_tvb = dissect_pft_fragmented(tvb, pinfo, pft_tree,
519 findex, fcount, seq, offset, real_len,
522 pinfo->fragmented = save_fragmented;
524 next_tvb = tvb_new_subset_remaining (tvb, offset);
527 dissect_af(next_tvb, pinfo, tree);
531 /** Dissect an AF Packet. Parse an AF packet, checking the CRC if the CRC valid
532 * flag is set and calling any registered sub dissectors on the payload type.
533 * Currently only a payload type 'T' is defined which is the tag packet layer.
534 * If any others are defined then they can register themselves.
535 * \param[in,out] tvb The buffer containing the packet
536 * \param[in,out] pinfo The packet info structure
537 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
540 dissect_af (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
543 proto_item *ti = NULL;
544 proto_item *li = NULL;
545 proto_item *ci = NULL;
546 proto_tree *af_tree = NULL;
549 tvbuff_t *next_tvb = NULL;
551 pinfo->current_proto = "DCP-AF";
552 col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCP-AF");
554 if (tree) { /* we are being asked for details */
555 ti = proto_tree_add_item (tree, proto_af, tvb, 0, -1, FALSE);
556 af_tree = proto_item_add_subtree (ti, ett_af);
557 proto_tree_add_item (af_tree, hf_edcp_sync, tvb, offset, 2, FALSE);
560 payload_len = tvb_get_ntohl(tvb, offset);
562 guint32 real_payload_len = tvb_length(tvb)-12;
563 li = proto_tree_add_item (af_tree, hf_edcp_len, tvb, offset, 4, FALSE);
564 if(real_payload_len < payload_len) {
565 proto_item_append_text (li, " (wrong len claims %d is %d)",
566 payload_len, real_payload_len
568 } else if(real_payload_len > payload_len) {
569 proto_item_append_text (li, " (%d bytes in packet after end of AF frame)",
570 real_payload_len-payload_len
576 proto_tree_add_item (af_tree, hf_edcp_seq, tvb, offset, 2, FALSE);
578 ver = tvb_get_guint8 (tvb, offset);
580 proto_tree_add_item (af_tree, hf_edcp_crcflag, tvb, offset, 1, FALSE);
581 proto_tree_add_item (af_tree, hf_edcp_maj, tvb, offset, 1, FALSE);
582 proto_tree_add_item (af_tree, hf_edcp_min, tvb, offset, 1, FALSE);
585 pt = tvb_get_guint8 (tvb, offset);
587 proto_tree_add_item (af_tree, hf_edcp_pt, tvb, offset, 1, FALSE);
589 next_tvb = tvb_new_subset (tvb, offset, payload_len, -1);
590 offset += payload_len;
592 ci = proto_tree_add_item (af_tree, hf_edcp_crc, tvb, offset, 2, FALSE);
593 if (ver & 0x80) { /* crc valid */
594 guint len = offset+2;
595 const char *crc_buf = (const char *) tvb_get_ptr(tvb, 0, len);
596 unsigned long c = crc_drm(crc_buf, len, 16, 0x11021, 1);
598 proto_item_append_text(ci, " (%s)", (c==0xe2f0)?"Ok":"bad");
599 proto_tree_add_boolean(af_tree, hf_edcp_crc_ok, tvb, offset, 2, c==0xe2f0);
603 dissector_try_port(af_dissector_table, pt, next_tvb, pinfo, tree);
606 /** Dissect the Tag Packet Layer.
607 * Split the AF packet into its tag items. Each tag item has a 4 character
608 * tag, a length in bits and a value. The *ptr tag is dissected in the routine.
609 * All other tags are listed and may be handled by other dissectors.
610 * Child dissectors are tied to the parent tree, not to this tree, so that
611 * they appear at the same level as DCP.
612 * \param[in,out] tvb The buffer containing the packet
613 * \param[in,out] pinfo The packet info structure
614 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
617 dissect_tpl(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
619 proto_tree *tpl_tree = NULL;
624 pinfo->current_proto = "DCP-TPL";
625 col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCP-TPL");
628 proto_item *ti = NULL;
629 ti = proto_tree_add_item (tree, proto_tpl, tvb, 0, -1, FALSE);
630 tpl_tree = proto_item_add_subtree (ti, ett_tpl);
632 while(offset<tvb_length(tvb)) {
635 char *tag = (char*)tvb_get_ephemeral_string (tvb, offset, 4); offset += 4;
636 bits = tvb_get_ntohl(tvb, offset); offset += 4;
641 proto_item *i = NULL;
642 const guint8 *p = tvb_get_ptr(tvb, offset, bytes);
643 if(strcmp(tag, "*ptr")==0) {
644 prot = (char*)tvb_get_ephemeral_string (tvb, offset, 4);
645 maj = tvb_get_ntohs(tvb, offset+4);
646 min = tvb_get_ntohs(tvb, offset+6);
647 i = proto_tree_add_bytes_format(tpl_tree, hf_tpl_tlv, tvb,
648 offset-8, bytes+8, p, "%s %s rev %d.%d", tag, prot, maj, min);
650 i = proto_tree_add_bytes_format(tpl_tree, hf_tpl_tlv, tvb,
651 offset-8, bytes+8, p, "%s (%u bits)", tag, bits);
656 if(prot) { /* prot is non-NULL only if we have our tree. */
657 dissector_try_string(tpl_dissector_table, prot, tvb, pinfo, tree->parent);
662 proto_reg_handoff_dcp_etsi (void)
664 dissector_handle_t af_handle;
665 dissector_handle_t pft_handle;
666 dissector_handle_t tpl_handle;
668 af_handle = create_dissector_handle(dissect_af, proto_af);
669 pft_handle = create_dissector_handle(dissect_pft, proto_pft);
670 tpl_handle = create_dissector_handle(dissect_tpl, proto_tpl);
671 heur_dissector_add("udp", dissect_dcp_etsi, proto_dcp_etsi);
672 dissector_add_string("dcp-etsi.sync", "AF", af_handle);
673 dissector_add_string("dcp-etsi.sync", "PF", pft_handle);
674 /* if there are ever other payload types ...*/
675 dissector_add("dcp-af.pt", 'T', tpl_handle);
679 proto_register_dcp_etsi (void)
681 static hf_register_info hf_edcp[] = {
683 {"sync", "dcp-etsi.sync",
684 FT_STRING, BASE_NONE, NULL, 0,
688 static hf_register_info hf_af[] = {
690 {"length", "dcp-af.len",
691 FT_UINT32, BASE_DEC, NULL, 0,
692 "length in bytes of the payload", HFILL}
695 {"frame count", "dcp-af.seq",
696 FT_UINT16, BASE_DEC, NULL, 0,
697 "Logical Frame Number", HFILL}
700 {"crc flag", "dcp-af.crcflag",
701 FT_BOOLEAN, 8, NULL, 0x80,
702 "Frame is protected by CRC", HFILL}
705 {"Major Revision", "dcp-af.maj",
706 FT_UINT8, BASE_DEC, NULL, 0x70,
707 "Major Protocol Revision", HFILL}
710 {"Minor Revision", "dcp-af.min",
711 FT_UINT8, BASE_DEC, NULL, 0x0f,
712 "Minor Protocol Revision", HFILL}
715 {"Payload Type", "dcp-af.pt",
716 FT_STRING, BASE_NONE, NULL, 0,
717 "T means Tag Packets, all other values reserved", HFILL}
720 {"CRC", "dcp-af.crc",
721 FT_UINT16, BASE_HEX, NULL, 0,
725 {"CRC OK", "dcp-af.crc_ok",
726 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
731 static hf_register_info hf_pft[] = {
733 {"Sub-protocol", "dcp-pft.pt",
734 FT_UINT8, BASE_DEC, NULL, 0,
738 {"Sequence No", "dcp-pft.seq",
739 FT_UINT16, BASE_DEC, NULL, 0,
740 "PFT Sequence No", HFILL}
743 {"Fragment Index", "dcp-pft.findex",
744 FT_UINT24, BASE_DEC, NULL, 0,
745 "Index of the fragment within one AF Packet", HFILL}
748 {"Fragment Count", "dcp-pft.fcount",
749 FT_UINT24, BASE_DEC, NULL, 0,
750 "Number of fragments produced from this AF Packet", HFILL}
753 {"FEC", "dcp-pft.fec",
754 FT_BOOLEAN, 16, NULL, 0x8000,
755 "When set the optional RS header is present", HFILL}
758 {"Addr", "dcp-pft.addr",
759 FT_BOOLEAN, 16, NULL, 0x4000,
760 "When set the optional transport header is present", HFILL}
763 {"fragment length", "dcp-pft.len",
764 FT_UINT16, BASE_DEC, NULL, 0x3fff,
765 "length in bytes of the payload of this fragment", HFILL}
768 {"RSk", "dcp-pft.rsk",
769 FT_UINT8, BASE_DEC, NULL, 0,
770 "The length of the Reed Solomon data word", HFILL}
773 {"RSz", "dcp-pft.rsz",
774 FT_UINT8, BASE_DEC, NULL, 0,
775 "The number of padding bytes in the last Reed Solomon block", HFILL}
778 {"source addr", "dcp-pft.source",
779 FT_UINT16, BASE_DEC, NULL, 0,
780 "PFT source identifier", HFILL}
783 {"dest addr", "dcp-pft.dest",
784 FT_UINT16, BASE_DEC, NULL, 0,
785 "PFT destination identifier", HFILL}
788 {"header CRC", "dcp-pft.crc",
789 FT_UINT16, BASE_HEX, NULL, 0,
790 "PFT Header CRC", HFILL}
793 {"PFT CRC OK", "dcp-pft.crc_ok",
794 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
795 "PFT Header CRC OK", HFILL}
798 {"Message fragments", "dcp-pft.fragments",
799 FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL}},
801 {"Message fragment", "dcp-pft.fragment",
802 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
803 {&hf_edcp_fragment_overlap,
804 {"Message fragment overlap", "dcp-pft.fragment.overlap",
805 FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL}},
806 {&hf_edcp_fragment_overlap_conflicts,
807 {"Message fragment overlapping with conflicting data",
808 "dcp-pft.fragment.overlap.conflicts",
809 FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL}},
810 {&hf_edcp_fragment_multiple_tails,
811 {"Message has multiple tail fragments",
812 "dcp-pft.fragment.multiple_tails",
813 FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL}},
814 {&hf_edcp_fragment_too_long_fragment,
815 {"Message fragment too long", "dcp-pft.fragment.too_long_fragment",
816 FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL}},
817 {&hf_edcp_fragment_error,
818 {"Message defragmentation error", "dcp-pft.fragment.error",
819 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
820 {&hf_edcp_reassembled_in,
821 {"Reassembled in", "dcp-pft.reassembled.in",
822 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
824 {"C max", "dcp-pft.cmax",
825 FT_UINT16, BASE_DEC, NULL, 0,
826 "Maximum number of RS chunks sent", HFILL}
829 {"Rx min", "dcp-pft.rxmin",
830 FT_UINT16, BASE_DEC, NULL, 0,
831 "Minimum number of fragments needed for RS decode", HFILL}
833 {&hf_edcp_rs_corrected,
834 {"RS Symbols Corrected", "dcp-pft.rs_corrected",
835 FT_INT16, BASE_DEC, NULL, 0,
836 "Number of symbols corrected by RS decode or -1 for failure", HFILL}
839 {"RS decode OK", "dcp-pft.rs_ok",
840 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
841 "successfully decoded RS blocks", HFILL}
843 {&hf_edcp_pft_payload,
844 {"payload", "dcp-pft.payload",
845 FT_BYTES, BASE_NONE, NULL, 0,
846 "PFT Payload", HFILL}
850 static hf_register_info hf_tpl[] = {
852 {"tag", "dcp-tpl.tlv",
853 FT_BYTES, BASE_NONE, NULL, 0,
857 {"Type", "dcp-tpl.ptr",
858 FT_STRING, BASE_NONE, NULL, 0,
859 "Protocol Type & Revision", HFILL}
863 /* Setup protocol subtree array */
864 static gint *ett[] = {
873 proto_dcp_etsi = proto_register_protocol ("ETSI Distribution & Communication Protocol (for DRM)", /* name */
874 "DCP (ETSI)", /* short name */
875 "dcp-etsi" /* abbrev */
877 proto_af = proto_register_protocol ("DCP Application Framing Layer", "DCP-AF", "dcp-af");
878 proto_pft = proto_register_protocol ("DCP Protection, Fragmentation & Transport Layer", "DCP-PFT", "dcp-pft");
879 proto_tpl = proto_register_protocol ("DCP Tag Packet Layer", "DCP-TPL", "dcp-tpl");
881 proto_register_field_array (proto_dcp_etsi, hf_edcp, array_length (hf_edcp));
882 proto_register_field_array (proto_af, hf_af, array_length (hf_af));
883 proto_register_field_array (proto_pft, hf_pft, array_length (hf_pft));
884 proto_register_field_array (proto_tpl, hf_tpl, array_length (hf_tpl));
885 proto_register_subtree_array (ett, array_length (ett));
887 /* subdissector code */
888 dcp_dissector_table = register_dissector_table("dcp-etsi.sync",
889 "DCP Sync", FT_STRING, BASE_NONE);
890 af_dissector_table = register_dissector_table("dcp-af.pt",
891 "AF Payload Type", FT_UINT8, BASE_DEC);
893 tpl_dissector_table = register_dissector_table("dcp-tpl.ptr",
894 "AF Payload Type", FT_STRING, BASE_NONE);
896 register_init_routine(dcp_init_protocol);