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 if (check_col (pinfo->cinfo, COL_INFO)) {
187 col_clear (pinfo->cinfo, COL_INFO);
189 if (check_col (pinfo->cinfo, COL_PROTOCOL)) {
190 col_set_str (pinfo->cinfo, COL_PROTOCOL, "DCP (ETSI)");
191 /*col_append_fstr (pinfo->cinfo, COL_INFO, " tvb %d", tvb_length(tvb));*/
195 proto_item *ti = NULL;
196 ti = proto_tree_add_item (tree, proto_dcp_etsi, tvb, 0, -1, FALSE);
197 dcp_tree = proto_item_add_subtree (ti, ett_edcp);
200 dissector_try_string(dcp_dissector_table, (char*)sync, tvb, pinfo, dcp_tree);
204 #define PFT_RS_N_MAX 207
206 #define PFT_RS_P (PFT_RS_K - PFT_RS_N_MAX)
210 void rs_deinterleave(const guint8 *input, guint8 *output, guint16 plen, guint32 fcount)
213 for(fidx=0; fidx<fcount; fidx++)
216 for (r=0; r<plen; r++)
218 output[fidx+r*fcount] = input[fidx*plen+r];
224 gboolean rs_correct_data(guint8 *deinterleaved, guint8 *output,
225 guint32 c_max, guint16 rsk, guint16 rsz _U_)
227 guint32 i, index_coded = 0, index_out = 0;
229 for (i=0; i<c_max; i++)
231 memcpy(output+index_out, deinterleaved+index_coded, rsk);
233 memcpy(output+index_out+PFT_RS_N_MAX, deinterleaved+index_coded, PFT_RS_P);
234 index_coded += PFT_RS_P;
235 err_corr = eras_dec_rs(output+index_out, NULL, 0);
244 /* Don't attempt reassembly if we have a huge number of fragments. */
245 #define MAX_FRAGMENTS ((1 * 1024 * 1024) / sizeof(guint32))
248 dissect_pft_fec_detailed(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
260 guint16 decoded_size;
263 gboolean first, last;
264 tvbuff_t *new_tvb=NULL;
266 if (fcount > MAX_FRAGMENTS) {
268 proto_tree_add_text(tree, tvb , 0, -1, "[Reassembly of %d fragments not attempted]", fcount);
273 last = fcount == (findex+1);
274 decoded_size = fcount*plen;
275 c_max = fcount*plen/(rsk+PFT_RS_P); /* rounded down */
276 rx_min = c_max*rsk/plen;
277 if(rx_min*plen<c_max*rsk)
280 new_tvb = process_reassembled_data (tvb, offset, pinfo,
281 "Reassembled Message",
282 fdx, &dcp_frag_items,
288 fragment_data *fd_head;
291 proto_tree_add_text (tree, tvb, 0, -1, "want %d, got %d need %d",
292 fcount, fragments, rx_min
294 got = ep_alloc(fcount*sizeof(guint32));
296 /* make a list of the findex (offset) numbers of the fragments we have */
297 fd = fragment_get(pinfo, seq, dcp_fragment_table);
298 for (fd_head = fd; fd_head != NULL; fd_head = fd_head->next) {
300 got[fragments++] = fd_head->offset; /* this is the findex of the fragment */
303 /* put a sentinel at the end */
304 got[fragments++] = fcount;
305 /* have we got enough for Reed Solomon to try to correct ? */
306 if(fragments>=rx_min) { /* yes, in theory */
307 guint i,current_findex;
308 fragment_data *frag=NULL;
309 guint8 *dummy_data = (guint8*) ep_alloc0 (plen);
310 tvbuff_t *dummytvb = tvb_new_real_data(dummy_data, plen, plen);
311 /* try and decode with missing fragments */
313 proto_tree_add_text (tree, tvb, 0, -1, "want %d, got %d need %d",
314 fcount, fragments, rx_min
316 /* fill the fragment table with empty fragments */
318 for(i=0; i<fragments; i++) {
319 guint next_fragment_we_have = got[i];
320 if (next_fragment_we_have > MAX_FRAGMENTS) {
322 proto_tree_add_text(tree, tvb , 0, -1, "[Reassembly of %d fragments not attempted]", next_fragment_we_have);
325 for(; current_findex<next_fragment_we_have; current_findex++) {
326 frag = fragment_add_seq_check (dummytvb, 0, pinfo, seq,
327 dcp_fragment_table, dcp_reassembled_table,
328 current_findex, plen, (current_findex+1!=fcount));
330 current_findex++; /* skip over the fragment we have */
333 new_tvb = process_reassembled_data (tvb, offset, pinfo,
334 "Reassembled Message",
335 frag, &dcp_frag_items,
340 gboolean decoded = TRUE;
341 tvbuff_t *dtvb = NULL;
342 const guint8 *input = tvb_get_ptr(new_tvb, 0, -1);
343 guint16 reassembled_size = tvb_length(new_tvb);
344 guint8 *deinterleaved = (guint8*) g_malloc (reassembled_size);
345 guint8 *output = (guint8*) g_malloc (decoded_size);
346 rs_deinterleave(input, deinterleaved, plen, fcount);
348 dtvb = tvb_new_child_real_data(tvb, deinterleaved, reassembled_size, reassembled_size);
349 add_new_data_source(pinfo, dtvb, "Deinterleaved");
350 tvb_set_free_cb(dtvb, g_free);
352 decoded = rs_correct_data(deinterleaved, output, c_max, rsk, rsz);
354 proto_tree_add_boolean (tree, hf_edcp_rs_ok, tvb, offset, 2, decoded);
356 new_tvb = tvb_new_child_real_data(dtvb, output, decoded_size, decoded_size);
357 add_new_data_source(pinfo, new_tvb, "RS Error Corrected Data");
358 tvb_set_free_cb(new_tvb, g_free);
364 /** Handle a PFT packet which has the fragmentation header. This uses the
365 * standard wireshark methods for reassembling fragments. If FEC is used,
366 * the FEC is handled too. For the moment, all the fragments must be
367 * available but this could be improved.
368 * \param[in,out] tvb The buffer containing the current fragment
369 * \param[in,out] pinfo The packet info structure
370 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
371 * \param[in] findex the fragment count
372 * \param[in] fcount the number of fragments
373 * \param[in] seq the sequence number of the reassembled packet
374 * \param[in] offset the offset into the tvb of the fragment
375 * \param[in] plen the length of each fragment
376 * \param[in] fec is fec used
377 * \param[in] rsk the number of useful bytes in each chunk
378 * \param[in] rsz the number of padding bytes in each chunk
381 dissect_pft_fragmented(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree,
392 gboolean first, last;
393 tvbuff_t *new_tvb=NULL;
394 fragment_data *frag_edcp = NULL;
395 pinfo->fragmented = TRUE;
397 last = fcount == (findex+1);
398 frag_edcp = fragment_add_seq_check (
401 dcp_fragment_table, dcp_reassembled_table,
406 new_tvb = dissect_pft_fec_detailed(
407 tvb, pinfo, tree, findex, fcount, seq, offset, plen, fec, rsk, rsz, frag_edcp
410 new_tvb = process_reassembled_data (tvb, offset, pinfo,
411 "Reassembled Message",
412 frag_edcp, &dcp_frag_items,
415 if (check_col (pinfo->cinfo, COL_INFO)) {
417 col_append_str (pinfo->cinfo, COL_INFO, " (Message Reassembled)");
420 col_append_str (pinfo->cinfo, COL_INFO, " (Message Reassembly failure)");
422 col_append_fstr (pinfo->cinfo, COL_INFO, " (Message fragment %u)", findex);
426 col_append_str (pinfo->cinfo, COL_INFO, " (first)");
428 col_append_str (pinfo->cinfo, COL_INFO, " (last)");
433 /** Dissect a PFT packet. Details follow
435 * \param[in,out] tvb The buffer containing the packet
436 * \param[in,out] pinfo The packet info structure
437 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
440 dissect_pft(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
444 guint16 seq, payload_len, hcrc;
445 guint32 findex, fcount;
446 proto_tree *pft_tree = NULL;
447 proto_item *ti = NULL, *li = NULL;
448 tvbuff_t *next_tvb = NULL;
449 gboolean fec = FALSE;
450 guint16 rsk=0, rsz=0;
452 pinfo->current_proto = "DCP-PFT";
453 if (check_col (pinfo->cinfo, COL_PROTOCOL)) {
454 col_set_str (pinfo->cinfo, COL_PROTOCOL, "DCP-PFT");
457 if (tree) { /* we are being asked for details */
458 ti = proto_tree_add_item (tree, proto_pft, tvb, 0, -1, FALSE);
459 pft_tree = proto_item_add_subtree (ti, ett_pft);
460 proto_tree_add_item (pft_tree, hf_edcp_sync, tvb, offset, 2, FALSE);
463 seq = tvb_get_ntohs (tvb, offset);
465 proto_tree_add_item (pft_tree, hf_edcp_pseq, tvb, offset, 2, FALSE);
468 findex = tvb_get_ntoh24 (tvb, offset);
470 proto_tree_add_item (pft_tree, hf_edcp_findex, tvb, offset, 3, FALSE);
473 fcount = tvb_get_ntoh24 (tvb, offset);
475 proto_tree_add_item (pft_tree, hf_edcp_fcount, tvb, offset, 3, FALSE);
478 plen = tvb_get_ntohs (tvb, offset);
479 payload_len = plen & 0x3fff;
481 proto_tree_add_item (pft_tree, hf_edcp_fecflag, tvb, offset, 2, FALSE);
482 proto_tree_add_item (pft_tree, hf_edcp_addrflag, tvb, offset, 2, FALSE);
483 li = proto_tree_add_item (pft_tree, hf_edcp_plen, tvb, offset, 2, FALSE);
488 rsk = tvb_get_guint8 (tvb, offset);
490 proto_tree_add_item (pft_tree, hf_edcp_rsk, tvb, offset, 1, FALSE);
492 rsz = tvb_get_guint8 (tvb, offset);
494 proto_tree_add_item (pft_tree, hf_edcp_rsz, tvb, offset, 1, FALSE);
499 proto_tree_add_item (pft_tree, hf_edcp_source, tvb, offset, 2, FALSE);
502 proto_tree_add_item (pft_tree, hf_edcp_dest, tvb, offset, 2, FALSE);
506 proto_item *ci = NULL;
507 guint header_len = offset+2;
508 const char *crc_buf = (const char *) tvb_get_ptr(tvb, 0, header_len);
509 unsigned long c = crc_drm(crc_buf, header_len, 16, 0x11021, 1);
510 ci = proto_tree_add_item (pft_tree, hf_edcp_hcrc, tvb, offset, 2, FALSE);
511 proto_item_append_text(ci, " (%s)", (c==0xe2f0)?"Ok":"bad");
512 proto_tree_add_boolean(pft_tree, hf_edcp_hcrc_ok, tvb, offset, 2, c==0xe2f0);
514 hcrc = tvb_get_ntohs (tvb, offset);
516 if (fcount > 1) { /* fragmented*/
517 gboolean save_fragmented = pinfo->fragmented;
518 guint16 real_len = tvb_length(tvb)-offset;
519 proto_tree_add_item (pft_tree, hf_edcp_pft_payload, tvb, offset, real_len, FALSE);
520 if(real_len != payload_len) {
522 proto_item_append_text(li, " (length error (%d))", real_len);
524 next_tvb = dissect_pft_fragmented(tvb, pinfo, pft_tree,
525 findex, fcount, seq, offset, real_len,
528 pinfo->fragmented = save_fragmented;
530 next_tvb = tvb_new_subset (tvb, offset, -1, -1);
533 dissect_af(next_tvb, pinfo, tree);
537 /** Dissect an AF Packet. Parse an AF packet, checking the CRC if the CRC valid
538 * flag is set and calling any registered sub dissectors on the payload type.
539 * Currently only a payload type 'T' is defined which is the tag packet layer.
540 * If any others are defined then they can register themselves.
541 * \param[in,out] tvb The buffer containing the packet
542 * \param[in,out] pinfo The packet info structure
543 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
546 dissect_af (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
549 proto_item *ti = NULL;
550 proto_item *li = NULL;
551 proto_item *ci = NULL;
552 proto_tree *af_tree = NULL;
555 tvbuff_t *next_tvb = NULL;
557 pinfo->current_proto = "DCP-AF";
558 if (check_col (pinfo->cinfo, COL_PROTOCOL)) {
559 col_set_str (pinfo->cinfo, COL_PROTOCOL, "DCP-AF");
562 if (tree) { /* we are being asked for details */
563 ti = proto_tree_add_item (tree, proto_af, tvb, 0, -1, FALSE);
564 af_tree = proto_item_add_subtree (ti, ett_af);
565 proto_tree_add_item (af_tree, hf_edcp_sync, tvb, offset, 2, FALSE);
568 payload_len = tvb_get_ntohl(tvb, offset);
570 guint32 real_payload_len = tvb_length(tvb)-12;
571 li = proto_tree_add_item (af_tree, hf_edcp_len, tvb, offset, 4, FALSE);
572 if(real_payload_len < payload_len) {
573 proto_item_append_text (li, " (wrong len claims %d is %d)",
574 payload_len, real_payload_len
576 } else if(real_payload_len > payload_len) {
577 proto_item_append_text (li, " (%d bytes in packet after end of AF frame)",
578 real_payload_len-payload_len
584 proto_tree_add_item (af_tree, hf_edcp_seq, tvb, offset, 2, FALSE);
586 ver = tvb_get_guint8 (tvb, offset);
588 proto_tree_add_item (af_tree, hf_edcp_crcflag, tvb, offset, 1, FALSE);
589 proto_tree_add_item (af_tree, hf_edcp_maj, tvb, offset, 1, FALSE);
590 proto_tree_add_item (af_tree, hf_edcp_min, tvb, offset, 1, FALSE);
593 pt = tvb_get_guint8 (tvb, offset);
595 proto_tree_add_item (af_tree, hf_edcp_pt, tvb, offset, 1, FALSE);
597 next_tvb = tvb_new_subset (tvb, offset, payload_len, -1);
598 offset += payload_len;
600 ci = proto_tree_add_item (af_tree, hf_edcp_crc, tvb, offset, 2, FALSE);
601 if (ver & 0x80) { /* crc valid */
602 guint len = offset+2;
603 const char *crc_buf = (const char *) tvb_get_ptr(tvb, 0, len);
604 unsigned long c = crc_drm(crc_buf, len, 16, 0x11021, 1);
606 proto_item_append_text(ci, " (%s)", (c==0xe2f0)?"Ok":"bad");
607 proto_tree_add_boolean(af_tree, hf_edcp_crc_ok, tvb, offset, 2, c==0xe2f0);
611 dissector_try_port(af_dissector_table, pt, next_tvb, pinfo, tree);
614 /** Dissect the Tag Packet Layer.
615 * Split the AF packet into its tag items. Each tag item has a 4 character
616 * tag, a length in bits and a value. The *ptr tag is dissected in the routine.
617 * All other tags are listed and may be handled by other dissectors.
618 * Child dissectors are tied to the parent tree, not to this tree, so that
619 * they appear at the same level as DCP.
620 * \param[in,out] tvb The buffer containing the packet
621 * \param[in,out] pinfo The packet info structure
622 * \param[in,out] tree The structure containing the details which will be displayed, filtered, etc.
625 dissect_tpl(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
627 proto_tree *tpl_tree = NULL;
632 pinfo->current_proto = "DCP-TPL";
633 if (check_col (pinfo->cinfo, COL_PROTOCOL)) {
634 col_set_str (pinfo->cinfo, COL_PROTOCOL, "DCP-TPL");
638 proto_item *ti = NULL;
639 ti = proto_tree_add_item (tree, proto_tpl, tvb, 0, -1, FALSE);
640 tpl_tree = proto_item_add_subtree (ti, ett_tpl);
642 while(offset<tvb_length(tvb)) {
645 char *tag = (char*)tvb_get_ephemeral_string (tvb, offset, 4); offset += 4;
646 bits = tvb_get_ntohl(tvb, offset); offset += 4;
651 proto_item *i = NULL;
652 const guint8 *p = tvb_get_ptr(tvb, offset, bytes);
653 if(strcmp(tag, "*ptr")==0) {
654 prot = (char*)tvb_get_ephemeral_string (tvb, offset, 4);
655 maj = tvb_get_ntohs(tvb, offset+4);
656 min = tvb_get_ntohs(tvb, offset+6);
657 i = proto_tree_add_bytes_format(tpl_tree, hf_tpl_tlv, tvb,
658 offset-8, bytes+8, p, "%s %s rev %d.%d", tag, prot, maj, min);
660 i = proto_tree_add_bytes_format(tpl_tree, hf_tpl_tlv, tvb,
661 offset-8, bytes+8, p, "%s (%u bits)", tag, bits);
666 if(prot) { /* prot is non-NULL only if we have our tree. */
667 dissector_try_string(tpl_dissector_table, prot, tvb, pinfo, tree->parent);
672 proto_reg_handoff_dcp_etsi (void)
674 dissector_handle_t af_handle;
675 dissector_handle_t pft_handle;
676 dissector_handle_t tpl_handle;
678 af_handle = create_dissector_handle(dissect_af, proto_af);
679 pft_handle = create_dissector_handle(dissect_pft, proto_pft);
680 tpl_handle = create_dissector_handle(dissect_tpl, proto_tpl);
681 heur_dissector_add("udp", dissect_dcp_etsi, proto_dcp_etsi);
682 dissector_add_string("dcp-etsi.sync", "AF", af_handle);
683 dissector_add_string("dcp-etsi.sync", "PF", pft_handle);
684 /* if there are ever other payload types ...*/
685 dissector_add("dcp-af.pt", 'T', tpl_handle);
689 proto_register_dcp_etsi (void)
691 static hf_register_info hf_edcp[] = {
693 {"sync", "dcp-etsi.sync",
694 FT_STRING, BASE_NONE, NULL, 0,
698 static hf_register_info hf_af[] = {
700 {"length", "dcp-af.len",
701 FT_UINT32, BASE_DEC, NULL, 0,
702 "length in bytes of the payload", HFILL}
705 {"frame count", "dcp-af.seq",
706 FT_UINT16, BASE_DEC, NULL, 0,
707 "Logical Frame Number", HFILL}
710 {"crc flag", "dcp-af.crcflag",
711 FT_BOOLEAN, 8, NULL, 0x80,
712 "Frame is protected by CRC", HFILL}
715 {"Major Revision", "dcp-af.maj",
716 FT_UINT8, BASE_DEC, NULL, 0x70,
717 "Major Protocol Revision", HFILL}
720 {"Minor Revision", "dcp-af.min",
721 FT_UINT8, BASE_DEC, NULL, 0x0f,
722 "Minor Protocol Revision", HFILL}
725 {"Payload Type", "dcp-af.pt",
726 FT_STRING, BASE_NONE, NULL, 0,
727 "T means Tag Packets, all other values reserved", HFILL}
730 {"CRC", "dcp-af.crc",
731 FT_UINT16, BASE_HEX, NULL, 0,
735 {"CRC OK", "dcp-af.crc_ok",
736 FT_BOOLEAN, BASE_NONE, NULL, 0,
741 static hf_register_info hf_pft[] = {
743 {"Sub-protocol", "dcp-pft.pt",
744 FT_UINT8, BASE_DEC, NULL, 0,
748 {"Sequence No", "dcp-pft.seq",
749 FT_UINT16, BASE_DEC, NULL, 0,
750 "PFT Sequence No", HFILL}
753 {"Fragment Index", "dcp-pft.findex",
754 FT_UINT24, BASE_DEC, NULL, 0,
755 "Index of the fragment within one AF Packet", HFILL}
758 {"Fragment Count", "dcp-pft.fcount",
759 FT_UINT24, BASE_DEC, NULL, 0,
760 "Number of fragments produced from this AF Packet", HFILL}
763 {"FEC", "dcp-pft.fec",
764 FT_BOOLEAN, 16, NULL, 0x8000,
765 "When set the optional RS header is present", HFILL}
768 {"Addr", "dcp-pft.addr",
769 FT_BOOLEAN, 16, NULL, 0x4000,
770 "When set the optional transport header is present", HFILL}
773 {"fragment length", "dcp-pft.len",
774 FT_UINT16, BASE_DEC, NULL, 0x3fff,
775 "length in bytes of the payload of this fragment", HFILL}
778 {"RSk", "dcp-pft.rsk",
779 FT_UINT8, BASE_DEC, NULL, 0,
780 "The length of the Reed Solomon data word", HFILL}
783 {"RSz", "dcp-pft.rsz",
784 FT_UINT8, BASE_DEC, NULL, 0,
785 "The number of padding bytes in the last Reed Solomon block", HFILL}
788 {"source addr", "dcp-pft.source",
789 FT_UINT16, BASE_DEC, NULL, 0,
790 "PFT source identifier", HFILL}
793 {"dest addr", "dcp-pft.dest",
794 FT_UINT16, BASE_DEC, NULL, 0,
795 "PFT destination identifier", HFILL}
798 {"header CRC", "dcp-pft.crc",
799 FT_UINT16, BASE_HEX, NULL, 0,
800 "PFT Header CRC", HFILL}
803 {"PFT CRC OK", "dcp-pft.crc_ok",
804 FT_BOOLEAN, BASE_NONE, NULL, 0,
805 "PFT Header CRC OK", HFILL}
808 {"Message fragments", "dcp-pft.fragments",
809 FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL}},
811 {"Message fragment", "dcp-pft.fragment",
812 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
813 {&hf_edcp_fragment_overlap,
814 {"Message fragment overlap", "dcp-pft.fragment.overlap",
815 FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL}},
816 {&hf_edcp_fragment_overlap_conflicts,
817 {"Message fragment overlapping with conflicting data",
818 "dcp-pft.fragment.overlap.conflicts",
819 FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL}},
820 {&hf_edcp_fragment_multiple_tails,
821 {"Message has multiple tail fragments",
822 "dcp-pft.fragment.multiple_tails",
823 FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL}},
824 {&hf_edcp_fragment_too_long_fragment,
825 {"Message fragment too long", "dcp-pft.fragment.too_long_fragment",
826 FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL}},
827 {&hf_edcp_fragment_error,
828 {"Message defragmentation error", "dcp-pft.fragment.error",
829 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
830 {&hf_edcp_reassembled_in,
831 {"Reassembled in", "dcp-pft.reassembled.in",
832 FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL}},
834 {"C max", "dcp-pft.cmax",
835 FT_UINT16, BASE_DEC, NULL, 0,
836 "Maximum number of RS chunks sent", HFILL}
839 {"Rx min", "dcp-pft.rxmin",
840 FT_UINT16, BASE_DEC, NULL, 0,
841 "Minimum number of fragments needed for RS decode", HFILL}
843 {&hf_edcp_rs_corrected,
844 {"RS Symbols Corrected", "dcp-pft.rs_corrected",
845 FT_INT16, BASE_DEC, NULL, 0,
846 "Number of symbols corrected by RS decode or -1 for failure", HFILL}
849 {"RS decode OK", "dcp-pft.rs_ok",
850 FT_BOOLEAN, BASE_NONE, NULL, 0,
851 "successfully decoded RS blocks", HFILL}
853 {&hf_edcp_pft_payload,
854 {"payload", "dcp-pft.payload",
855 FT_BYTES, BASE_HEX, NULL, 0,
856 "PFT Payload", HFILL}
860 static hf_register_info hf_tpl[] = {
862 {"tag", "dcp-tpl.tlv",
863 FT_BYTES, BASE_HEX, NULL, 0,
867 {"Type", "dcp-tpl.ptr",
868 FT_STRING, BASE_NONE, NULL, 0,
869 "Protocol Type & Revision", HFILL}
873 /* Setup protocol subtree array */
874 static gint *ett[] = {
883 proto_dcp_etsi = proto_register_protocol ("ETSI Distribution & Communication Protocol (for DRM)", /* name */
884 "DCP (ETSI)", /* short name */
885 "dcp-etsi" /* abbrev */
887 proto_af = proto_register_protocol ("DCP Application Framing Layer", "DCP-AF", "dcp-af");
888 proto_pft = proto_register_protocol ("DCP Protection, Fragmentation & Transport Layer", "DCP-PFT", "dcp-pft");
889 proto_tpl = proto_register_protocol ("DCP Tag Packet Layer", "DCP-TPL", "dcp-tpl");
891 proto_register_field_array (proto_dcp_etsi, hf_edcp, array_length (hf_edcp));
892 proto_register_field_array (proto_af, hf_af, array_length (hf_af));
893 proto_register_field_array (proto_pft, hf_pft, array_length (hf_pft));
894 proto_register_field_array (proto_tpl, hf_tpl, array_length (hf_tpl));
895 proto_register_subtree_array (ett, array_length (ett));
897 /* subdissector code */
898 dcp_dissector_table = register_dissector_table("dcp-etsi.sync",
899 "DCP Sync", FT_STRING, BASE_NONE);
900 af_dissector_table = register_dissector_table("dcp-af.pt",
901 "AF Payload Type", FT_UINT8, BASE_DEC);
903 tpl_dissector_table = register_dissector_table("dcp-tpl.ptr",
904 "AF Payload Type", FT_STRING, BASE_NONE);
906 register_init_routine(dcp_init_protocol);