2 * Routines for decoding MDS Port Analyzer Adapter (FC in Eth) Header
3 * Copyright 2001, Dinesh G Dutt <ddutt@andiamo.com>
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.
34 #ifdef HAVE_SYS_TYPES_H
35 # include <sys/types.h>
38 #ifdef HAVE_NETINET_IN_H
39 # include <netinet/in.h>
44 #include <epan/packet.h>
45 #include <epan/etypes.h>
47 #define BRDWLK_MAX_PACKET_CNT 0xFFFF
48 #define BRDWLK_TRUNCATED_BIT 0x8
49 #define BRDWLK_HAS_PLEN 0x1
51 #define FCM_DELIM_SOFC1 0x01
52 #define FCM_DELIM_SOFI1 0x02
53 #define FCM_DELIM_SOFI2 0x04
54 #define FCM_DELIM_SOFI3 0x06
55 #define FCM_DELIM_SOFN1 0x03
56 #define FCM_DELIM_SOFN2 0x05
57 #define FCM_DELIM_SOFN3 0x07
58 #define FCM_DELIM_SOFF 0x08
59 #define FCM_DELIM_SOFC4 0x09
60 #define FCM_DELIM_SOFI4 0x0A
61 #define FCM_DELIM_SOFN4 0x0B
63 #define FCM_DELIM_EOFT 0x01
64 #define FCM_DELIM_EOFDT 0x02
65 #define FCM_DELIM_EOFN 0x03
66 #define FCM_DELIM_EOFA 0x04
67 #define FCM_DELIM_EOFNI 0x07
68 #define FCM_DELIM_EOFDTI 0x06
69 #define FCM_DELIM_EOFRT 0x0A
70 #define FCM_DELIM_EOFRTI 0x0E
71 #define FCM_DELIM_NOEOF 0xF0
72 #define FCM_DELIM_EOFJUMBO 0xF1
74 static const value_string brdwlk_sof_vals[] = {
75 {FCM_DELIM_SOFI1, "SOFi1"},
76 {FCM_DELIM_SOFI2, "SOFi2"},
77 {FCM_DELIM_SOFI3, "SOFi3"},
78 {FCM_DELIM_SOFN1, "SOFn1"},
79 {FCM_DELIM_SOFN2, "SOFn2"},
80 {FCM_DELIM_SOFN3, "SOFn3"},
81 {FCM_DELIM_SOFF, "SOFf"},
85 static const value_string brdwlk_eof_vals[] = {
86 {FCM_DELIM_EOFDT, "EOFdt"},
87 {FCM_DELIM_EOFA, "EOFa"},
88 {FCM_DELIM_EOFN, "EOFn"},
89 {FCM_DELIM_EOFT, "EOFt"},
93 static int hf_brdwlk_sof = -1;
94 static int hf_brdwlk_eof = -1;
95 static int hf_brdwlk_error = -1;
96 static int hf_brdwlk_vsan = -1;
97 static int hf_brdwlk_pktcnt = -1;
98 static int hf_brdwlk_drop = -1;
99 static int hf_brdwlk_plen = -1;
100 static int hf_brdwlk_error_plp = -1;
101 static int hf_brdwlk_error_ef = -1;
102 static int hf_brdwlk_error_nd = -1;
103 static int hf_brdwlk_error_tr = -1;
104 static int hf_brdwlk_error_badcrc = -1;
105 static int hf_brdwlk_error_ff = -1;
106 static int hf_brdwlk_error_jumbo = -1;
107 static int hf_brdwlk_error_ctrl = -1;
109 /* Initialize the subtree pointers */
110 static gint ett_brdwlk = -1;
111 static gint ett_brdwlk_error = -1;
113 static gint proto_brdwlk = -1;
115 static guint16 packet_count = 0;
116 static gboolean first_pkt = TRUE; /* start of capture */
118 static dissector_handle_t data_handle;
119 static dissector_handle_t fc_dissector_handle;
122 static const true_false_string tfs_error_plp = {
123 "Packet Length is PRESENT",
124 "Packet length is NOT present"
126 static const true_false_string tfs_error_ef = {
127 "This is an Empty Frame",
130 static const true_false_string tfs_error_nd = {
131 "This Frame has NO Data",
132 "This frame carries data"
134 static const true_false_string tfs_error_tr = {
135 "This frame is TRUNCATED",
136 "This frame is NOT truncated"
138 static const true_false_string tfs_error_crc = {
139 "This Frame has a BAD FC CRC",
140 "This frame has a valid crc"
142 static const true_false_string tfs_error_ff = {
146 static const true_false_string tfs_error_jumbo = {
147 "This is a JUMBO FC Frame",
148 "This is a NORMAL FC Frame"
150 static const true_false_string tfs_error_ctrl = {
151 "Ctrl Characters inside the frame",
152 "No ctrl chars inside the frame"
156 dissect_brdwlk_err(proto_tree *parent_tree, tvbuff_t *tvb, int offset)
158 proto_item *item=NULL;
159 proto_tree *tree=NULL;
162 flags = tvb_get_guint8 (tvb, offset);
164 item=proto_tree_add_uint(parent_tree, hf_brdwlk_error,
165 tvb, offset, 1, flags);
166 tree=proto_item_add_subtree(item, ett_brdwlk_error);
170 proto_tree_add_boolean(tree, hf_brdwlk_error_plp, tvb, offset, 1, flags);
172 proto_item_append_text(item, " Packet Length Present");
176 proto_tree_add_boolean(tree, hf_brdwlk_error_ef, tvb, offset, 1, flags);
178 proto_item_append_text(item, " Empty Frame");
182 proto_tree_add_boolean(tree, hf_brdwlk_error_nd, tvb, offset, 1, flags);
184 proto_item_append_text(item, " No Data");
188 proto_tree_add_boolean(tree, hf_brdwlk_error_tr, tvb, offset, 1, flags);
190 proto_item_append_text(item, " Truncated");
194 proto_tree_add_boolean(tree, hf_brdwlk_error_badcrc, tvb, offset, 1, flags);
196 proto_item_append_text(item, " Bad FC CRC");
200 proto_tree_add_boolean(tree, hf_brdwlk_error_ff, tvb, offset, 1, flags);
202 proto_item_append_text(item, " Fifo Full");
206 proto_tree_add_boolean(tree, hf_brdwlk_error_jumbo, tvb, offset, 1, flags);
208 proto_item_append_text(item, " Jumbo FC Frame");
212 proto_tree_add_boolean(tree, hf_brdwlk_error_ctrl, tvb, offset, 1, flags);
214 proto_item_append_text(item, " Ctrl Char Inside Frame");
219 /* Code to actually dissect the packets */
221 dissect_brdwlk (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
224 /* Set up structures needed to add the protocol subtree and manage it */
225 proto_item *ti, *hidden_item;
226 proto_tree *brdwlk_tree = NULL;
228 guint8 error, eof, sof;
231 gint len, reported_len, plen;
233 gboolean dropped_packets;
235 /* Make entries in Protocol column and Info column on summary display */
236 col_set_str(pinfo->cinfo, COL_PROTOCOL, "Boardwalk");
238 col_clear(pinfo->cinfo, COL_INFO);
240 pinfo->vsan = (tvb_get_ntohs (tvb, offset) & 0xFFF);
241 sof = (tvb_get_guint8 (tvb, offset) & 0xF0) >> 4;
243 if ((sof == FCM_DELIM_SOFI3) || (sof == FCM_DELIM_SOFI2) || (sof == FCM_DELIM_SOFI1)
244 || (sof == FCM_DELIM_SOFI4)) {
245 pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
247 else if (sof == FCM_DELIM_SOFF) {
248 pinfo->sof_eof = PINFO_SOF_SOFF;
252 ti = proto_tree_add_protocol_format (tree, proto_brdwlk, tvb, 0,
253 hdrlen, "Boardwalk");
255 brdwlk_tree = proto_item_add_subtree (ti, ett_brdwlk);
257 proto_tree_add_item (brdwlk_tree, hf_brdwlk_sof, tvb, offset, 1, 0);
258 proto_tree_add_item (brdwlk_tree, hf_brdwlk_vsan, tvb, offset, 2, 0);
262 /* Locate EOF which is the last 4 bytes of the frame */
263 len = tvb_length_remaining(tvb, hdrlen);
264 reported_len = tvb_reported_length_remaining(tvb, hdrlen);
265 if (reported_len < 4) {
267 * This packet is claimed not to even have enough data for
269 * Don't try to process the EOF.
273 else if (len < reported_len) {
275 * This packet is claimed to have enough data for a 4-byte EOF,
276 * but we didn't capture all of the packet.
277 * Slice off the 4-byte EOF from the reported length, and trim
278 * the captured length so it's no more than the reported length;
279 * that will slice off what of the EOF, if any, is in the
283 if (len > reported_len)
288 * We have the entire packet, and it includes a 4-byte EOF.
289 * Slice it off, and put it into the tree if we're building
294 offset = tvb_reported_length(tvb) - 4;
295 pkt_cnt = tvb_get_ntohs (tvb, offset);
297 proto_tree_add_uint (brdwlk_tree, hf_brdwlk_pktcnt, tvb, offset,
300 dropped_packets = FALSE;
301 if (pinfo->fd->flags.visited) {
303 * This isn't the first pass, so we can't use the global
304 * "packet_count" variable to determine whether there were
305 * any dropped frames or not.
306 * We therefore attach a non-null pointer as frame data to
307 * any frame preceded by dropped packets.
309 if (p_get_proto_data(pinfo->fd, proto_brdwlk) != NULL)
310 dropped_packets = TRUE;
313 * This is the first pass, so we have to use the global
314 * "packet_count" variable to determine whether there were
315 * any dropped frames or not.
317 * XXX - can there be more than one stream of packets, so that
318 * we can't just use a global variable?
320 if (pkt_cnt != packet_count + 1) {
322 (pkt_cnt != 0 || (packet_count != BRDWLK_MAX_PACKET_CNT))) {
323 dropped_packets = TRUE;
326 * Mark this frame as having been preceded by dropped
327 * packets. (The data we use as the frame data doesn't
328 * matter - it just matters that it's non-null.)
330 p_add_proto_data(pinfo->fd, proto_brdwlk, &packet_count);
335 hidden_item = proto_tree_add_boolean (brdwlk_tree, hf_brdwlk_drop,
336 tvb, offset, 0, dropped_packets);
337 PROTO_ITEM_SET_HIDDEN(hidden_item);
340 packet_count = pkt_cnt;
342 error=tvb_get_guint8(tvb, offset+2);
343 dissect_brdwlk_err(brdwlk_tree, tvb, offset+2);
345 eof = tvb_get_guint8 (tvb, offset+3);
346 if (eof != FCM_DELIM_EOFN) {
347 pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
349 else if (eof != FCM_DELIM_EOFT) {
350 pinfo->sof_eof |= PINFO_EOF_INVALID;
354 proto_tree_add_item (brdwlk_tree, hf_brdwlk_eof, tvb, offset+3,
358 if ((error & BRDWLK_HAS_PLEN) && tree) {
359 /* In newer Boardwalks, if this bit is set, the actual frame length
360 * is also provided. This length is the size between SOF & EOF
363 plen = tvb_get_ntohl (tvb, offset-4);
365 proto_tree_add_uint (brdwlk_tree, hf_brdwlk_plen, tvb, offset-4,
369 /* XXX - this would throw an exception if it would increase
370 * the reported length.
372 if (error & BRDWLK_TRUNCATED_BIT) {
373 tvb_set_reported_length (tvb, plen);
379 next_tvb = tvb_new_subset (tvb, 2, len, reported_len);
380 if (fc_dissector_handle) {
381 call_dissector (fc_dissector_handle, next_tvb, pinfo, tree);
392 /* Register the protocol with Wireshark */
394 /* this format is require because a script is used to build the C function
395 that calls all the protocol registration.
399 proto_register_brdwlk (void)
402 /* Setup list of header fields See Section 1.6.1 for details*/
403 static hf_register_info hf[] = {
405 {"SOF", "brdwlk.sof", FT_UINT8, BASE_HEX, VALS (brdwlk_sof_vals),
408 {"EOF", "brdwlk.eof", FT_UINT8, BASE_HEX, VALS (brdwlk_eof_vals),
411 {"Error", "brdwlk.error", FT_UINT8, BASE_HEX, NULL, 0x0, NULL,
414 {"Packet Count", "brdwlk.pktcnt", FT_UINT16, BASE_DEC, NULL, 0x0,
417 {"Packet Dropped", "brdwlk.drop", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
420 {"VSAN", "brdwlk.vsan", FT_UINT16, BASE_DEC, NULL, 0xFFF, NULL,
423 {"Original Packet Length", "brdwlk.plen", FT_UINT32, BASE_DEC, NULL, 0x0, NULL,
425 { &hf_brdwlk_error_plp,
426 {"Packet Length Present", "brdwlk.error.plp", FT_BOOLEAN, 8, TFS(&tfs_error_plp), 0x01, NULL,
428 { &hf_brdwlk_error_ef,
429 {"Empty Frame", "brdwlk.error.ef", FT_BOOLEAN, 8, TFS(&tfs_error_ef), 0x02, NULL,
431 { &hf_brdwlk_error_nd,
432 {"No Data", "brdwlk.error.nd", FT_BOOLEAN, 8, TFS(&tfs_error_nd), 0x04, NULL,
434 { &hf_brdwlk_error_tr,
435 {"Truncated", "brdwlk.error.tr", FT_BOOLEAN, 8, TFS(&tfs_error_tr), 0x08, NULL,
437 { &hf_brdwlk_error_badcrc,
438 {"CRC", "brdwlk.error.crc", FT_BOOLEAN, 8, TFS(&tfs_error_crc), 0x10, NULL,
440 { &hf_brdwlk_error_ff,
441 {"Fifo Full", "brdwlk.error.ff", FT_BOOLEAN, 8, TFS(&tfs_error_ff), 0x20, NULL,
443 { &hf_brdwlk_error_jumbo,
444 {"Jumbo FC Frame", "brdwlk.error.jumbo", FT_BOOLEAN, 8, TFS(&tfs_error_jumbo), 0x40, NULL,
446 { &hf_brdwlk_error_ctrl,
447 {"Ctrl Char Inside Frame", "brdwlk.error.ctrl", FT_BOOLEAN, 8, TFS(&tfs_error_ctrl), 0x80, NULL,
451 /* Setup protocol subtree array */
452 static gint *ett[] = {
457 /* Register the protocol name and description */
458 proto_brdwlk = proto_register_protocol("Boardwalk",
459 "Boardwalk", "brdwlk");
461 /* Required function calls to register the header fields and subtrees used */
462 proto_register_field_array(proto_brdwlk, hf, array_length(hf));
463 proto_register_subtree_array(ett, array_length(ett));
465 register_init_routine(&brdwlk_init);
469 /* If this dissector uses sub-dissector registration add a registration routine.
470 This format is required because a script is used to find these routines and
471 create the code that calls these routines.
474 proto_reg_handoff_brdwlk(void)
476 dissector_handle_t brdwlk_handle;
478 brdwlk_handle = create_dissector_handle (dissect_brdwlk, proto_brdwlk);
479 dissector_add("ethertype", ETHERTYPE_BRDWALK, brdwlk_handle);
480 dissector_add("ethertype", 0xABCD, brdwlk_handle);
481 data_handle = find_dissector("data");
482 fc_dissector_handle = find_dissector ("fc");