2 * Routines for FDDI packet disassembly
4 * Laurent Deniel <deniel@worldnet.fr>
6 * $Id: packet-fddi.c,v 1.29 2000/03/20 22:22:45 gram Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@zing.org>
10 * Copyright 1998 Gerald Combs
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
32 #ifdef HAVE_SYS_TYPES_H
33 # include <sys/types.h>
39 #include "packet-llc.h"
42 static int proto_fddi = -1;
43 static int hf_fddi_fc = -1;
44 static int hf_fddi_dst = -1;
45 static int hf_fddi_src = -1;
46 static int hf_fddi_addr = -1;
48 static gint ett_fddi = -1;
50 /* FDDI Frame Control values */
52 #define FDDI_FC_VOID 0x00 /* Void frame */
53 #define FDDI_FC_NRT 0x80 /* Nonrestricted token */
54 #define FDDI_FC_RT 0xc0 /* Restricted token */
55 #define FDDI_FC_MAC 0xc0 /* MAC frame */
56 #define FDDI_FC_SMT 0x40 /* SMT frame */
57 #define FDDI_FC_SMT_INFO 0x41 /* SMT Info */
58 #define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */
59 #define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO
60 #define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA
61 #define FDDI_FC_MAC_MIN 0xc1
62 #define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */
63 #define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */
64 #define FDDI_FC_MAC_MAX 0xcf
65 #define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */
66 #define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC
67 #define FDDI_FC_LLC_ASYNC_DEF 0x54
68 #define FDDI_FC_LLC_ASYNC_MAX 0x5f
69 #define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */
70 #define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC
71 #define FDDI_FC_LLC_SYNC_MAX 0xd7
72 #define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */
73 #define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC
74 #define FDDI_FC_IMP_ASYNC_MAX 0x6f
75 #define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */
77 #define FDDI_FC_CLFF 0xF0 /* Class/Length/Format bits */
78 #define FDDI_FC_ZZZZ 0x0F /* Control bits */
81 * Async frame ZZZZ bits:
83 #define FDDI_FC_ASYNC_R 0x08 /* Reserved */
84 #define FDDI_FC_ASYNC_PRI 0x07 /* Priority */
86 #define FDDI_HEADER_SIZE 13
91 #define FDDI_P_DHOST 1
92 #define FDDI_P_SHOST 7
94 /* "swaptab[i]" is the value of "i" with the bits reversed. */
95 static u_char swaptab[256] = {
96 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
97 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
98 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
99 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
100 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
101 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
102 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
103 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
104 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
105 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
106 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
107 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
108 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
109 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
110 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
111 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
112 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
113 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
114 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
115 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
116 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
117 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
118 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
119 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
120 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
121 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
122 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
123 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
124 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
125 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
126 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
127 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
131 swap_mac_addr(u_char *swapped_addr, const u_char *orig_addr)
135 for (i = 0; i < 6; i++) {
136 swapped_addr[i] = swaptab[orig_addr[i]];
142 capture_fddi(const u_char *pd, packet_counts *ld)
146 if (!BYTES_ARE_IN_FRAME(0, FDDI_HEADER_SIZE)) {
150 offset = FDDI_HEADER_SIZE;
152 fc = (int) pd[FDDI_P_FC];
156 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
158 case FDDI_FC_LLC_ASYNC + 0 :
159 case FDDI_FC_LLC_ASYNC + 1 :
160 case FDDI_FC_LLC_ASYNC + 2 :
161 case FDDI_FC_LLC_ASYNC + 3 :
162 case FDDI_FC_LLC_ASYNC + 4 :
163 case FDDI_FC_LLC_ASYNC + 5 :
164 case FDDI_FC_LLC_ASYNC + 6 :
165 case FDDI_FC_LLC_ASYNC + 7 :
166 case FDDI_FC_LLC_ASYNC + 8 :
167 case FDDI_FC_LLC_ASYNC + 9 :
168 case FDDI_FC_LLC_ASYNC + 10 :
169 case FDDI_FC_LLC_ASYNC + 11 :
170 case FDDI_FC_LLC_ASYNC + 12 :
171 case FDDI_FC_LLC_ASYNC + 13 :
172 case FDDI_FC_LLC_ASYNC + 14 :
173 case FDDI_FC_LLC_ASYNC + 15 :
174 capture_llc(pd, offset, ld);
185 fddifc_to_str(int fc)
187 static gchar strbuf[128+1];
191 case FDDI_FC_VOID: /* Void frame */
194 case FDDI_FC_NRT: /* Nonrestricted token */
195 return "Nonrestricted token";
197 case FDDI_FC_RT: /* Restricted token */
198 return "Restricted token";
200 case FDDI_FC_SMT_INFO: /* SMT Info */
203 case FDDI_FC_SMT_NSA: /* SMT Next station adrs */
204 return "SMT Next station address";
206 case FDDI_FC_MAC_BEACON: /* MAC Beacon frame */
209 case FDDI_FC_MAC_CLAIM: /* MAC Claim frame */
210 return "MAC claim token";
213 switch (fc & FDDI_FC_CLFF) {
216 sprintf(strbuf, "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
220 sprintf(strbuf, "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
223 case FDDI_FC_LLC_ASYNC:
224 if (fc & FDDI_FC_ASYNC_R)
225 sprintf(strbuf, "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
227 sprintf(strbuf, "Async LLC frame, priority %d",
228 fc & FDDI_FC_ASYNC_PRI);
231 case FDDI_FC_LLC_SYNC:
232 if (fc & FDDI_FC_ZZZZ) {
233 sprintf(strbuf, "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
236 return "Sync LLC frame";
238 case FDDI_FC_IMP_ASYNC:
239 sprintf(strbuf, "Implementor async frame, control %x",
243 case FDDI_FC_IMP_SYNC:
244 sprintf(strbuf, "Implementor sync frame, control %x",
250 return "Unknown frame type";
255 void dissect_fddi(const u_char *pd, frame_data *fd, proto_tree *tree,
262 static u_char src[6], dst[6];
263 u_char src_swapped[6], dst_swapped[6];
265 if (!BYTES_ARE_IN_FRAME(0, FDDI_HEADER_SIZE)) {
266 dissect_data(pd, offset, fd, tree);
270 /* Extract the source and destination addresses, possibly bit-swapping
273 swap_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]);
274 swap_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]);
276 memcpy(dst, (u_char *)&pd[FDDI_P_DHOST], sizeof dst);
277 memcpy(src, (u_char *)&pd[FDDI_P_SHOST], sizeof src);
280 fc = (int) pd[FDDI_P_FC];
281 fc_str = fddifc_to_str(fc);
283 /* XXX - copy them to some buffer associated with "pi", rather than
284 just making "src" and "dst" static? */
285 SET_ADDRESS(&pi.dl_src, AT_ETHER, 6, &src[0]);
286 SET_ADDRESS(&pi.src, AT_ETHER, 6, &src[0]);
287 SET_ADDRESS(&pi.dl_dst, AT_ETHER, 6, &dst[0]);
288 SET_ADDRESS(&pi.dst, AT_ETHER, 6, &dst[0]);
290 if (check_col(fd, COL_PROTOCOL))
291 col_add_str(fd, COL_PROTOCOL, "FDDI");
292 if (check_col(fd, COL_INFO))
293 col_add_str(fd, COL_INFO, fc_str);
295 offset = FDDI_HEADER_SIZE;
298 ti = proto_tree_add_protocol_format(tree, proto_fddi, 0, offset,
299 "Fiber Distributed Data Interface, %s", fc_str);
301 swap_mac_addr(dst_swapped, (u_char*)&pd[FDDI_P_DHOST]);
302 swap_mac_addr(src_swapped, (u_char*)&pd[FDDI_P_SHOST]);
304 fh_tree = proto_item_add_subtree(ti, ett_fddi);
305 proto_tree_add_item(fh_tree, hf_fddi_fc, FDDI_P_FC, 1, fc);
306 proto_tree_add_item(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst);
307 proto_tree_add_item(fh_tree, hf_fddi_src, FDDI_P_SHOST, 6, src);
308 proto_tree_add_item_hidden(fh_tree, hf_fddi_addr, FDDI_P_DHOST, 6, dst);
309 proto_tree_add_item_hidden(fh_tree, hf_fddi_addr, FDDI_P_SHOST, 6, src);
311 /* hide some bit-swapped mac address fields in the proto_tree, just in case */
312 proto_tree_add_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst_swapped);
313 proto_tree_add_item_hidden(fh_tree, hf_fddi_src, FDDI_P_SHOST, 6, src_swapped);
314 proto_tree_add_item_hidden(fh_tree, hf_fddi_addr, FDDI_P_DHOST, 6, dst_swapped);
315 proto_tree_add_item_hidden(fh_tree, hf_fddi_addr, FDDI_P_SHOST, 6, src_swapped);
320 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
322 case FDDI_FC_LLC_ASYNC + 0 :
323 case FDDI_FC_LLC_ASYNC + 1 :
324 case FDDI_FC_LLC_ASYNC + 2 :
325 case FDDI_FC_LLC_ASYNC + 3 :
326 case FDDI_FC_LLC_ASYNC + 4 :
327 case FDDI_FC_LLC_ASYNC + 5 :
328 case FDDI_FC_LLC_ASYNC + 6 :
329 case FDDI_FC_LLC_ASYNC + 7 :
330 case FDDI_FC_LLC_ASYNC + 8 :
331 case FDDI_FC_LLC_ASYNC + 9 :
332 case FDDI_FC_LLC_ASYNC + 10 :
333 case FDDI_FC_LLC_ASYNC + 11 :
334 case FDDI_FC_LLC_ASYNC + 12 :
335 case FDDI_FC_LLC_ASYNC + 13 :
336 case FDDI_FC_LLC_ASYNC + 14 :
337 case FDDI_FC_LLC_ASYNC + 15 :
338 dissect_llc(pd, offset, fd, tree);
342 dissect_data(pd, offset, fd, tree);
349 proto_register_fddi(void)
351 static hf_register_info hf[] = {
354 * XXX - we want this guy to have his own private formatting
355 * routine, using "fc_to_str()"; if "fc_to_str()" returns
356 * NULL, just show the hex value, else show the string.
359 { "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
363 { "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
364 "Destination Hardware Address" }},
367 { "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
371 { "Source or Destination Address", "fddi.addr", FT_ETHER, BASE_NONE, NULL, 0x0,
372 "Source or Destination Hardware Address" }},
375 static gint *ett[] = {
379 proto_fddi = proto_register_protocol ("Fiber Distributed Data Interface", "fddi" );
380 proto_register_field_array(proto_fddi, hf, array_length(hf));
381 proto_register_subtree_array(ett, array_length(ett));