2 * Routines for FDDI packet disassembly
4 * Laurent Deniel <deniel@worldnet.fr>
6 * $Id: packet-fddi.c,v 1.27 2000/02/15 21:02:08 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;
47 static gint ett_fddi = -1;
49 /* FDDI Frame Control values */
51 #define FDDI_FC_VOID 0x00 /* Void frame */
52 #define FDDI_FC_NRT 0x80 /* Nonrestricted token */
53 #define FDDI_FC_RT 0xc0 /* Restricted token */
54 #define FDDI_FC_MAC 0xc0 /* MAC frame */
55 #define FDDI_FC_SMT 0x40 /* SMT frame */
56 #define FDDI_FC_SMT_INFO 0x41 /* SMT Info */
57 #define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */
58 #define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO
59 #define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA
60 #define FDDI_FC_MAC_MIN 0xc1
61 #define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */
62 #define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */
63 #define FDDI_FC_MAC_MAX 0xcf
64 #define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */
65 #define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC
66 #define FDDI_FC_LLC_ASYNC_DEF 0x54
67 #define FDDI_FC_LLC_ASYNC_MAX 0x5f
68 #define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */
69 #define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC
70 #define FDDI_FC_LLC_SYNC_MAX 0xd7
71 #define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */
72 #define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC
73 #define FDDI_FC_IMP_ASYNC_MAX 0x6f
74 #define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */
76 #define FDDI_FC_CLFF 0xF0 /* Class/Length/Format bits */
77 #define FDDI_FC_ZZZZ 0x0F /* Control bits */
80 * Async frame ZZZZ bits:
82 #define FDDI_FC_ASYNC_R 0x08 /* Reserved */
83 #define FDDI_FC_ASYNC_PRI 0x07 /* Priority */
85 #define FDDI_HEADER_SIZE 13
90 #define FDDI_P_DHOST 1
91 #define FDDI_P_SHOST 7
93 /* "swaptab[i]" is the value of "i" with the bits reversed. */
94 static u_char swaptab[256] = {
95 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
96 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
97 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
98 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
99 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
100 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
101 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
102 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
103 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
104 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
105 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
106 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
107 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
108 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
109 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
110 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
111 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
112 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
113 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
114 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
115 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
116 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
117 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
118 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
119 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
120 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
121 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
122 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
123 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
124 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
125 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
126 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
130 swap_mac_addr(u_char *swapped_addr, const u_char *orig_addr)
134 for (i = 0; i < 6; i++) {
135 swapped_addr[i] = swaptab[orig_addr[i]];
141 capture_fddi(const u_char *pd, packet_counts *ld)
145 if (!BYTES_ARE_IN_FRAME(0, FDDI_HEADER_SIZE)) {
149 offset = FDDI_HEADER_SIZE;
151 fc = (int) pd[FDDI_P_FC];
155 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
157 case FDDI_FC_LLC_ASYNC + 0 :
158 case FDDI_FC_LLC_ASYNC + 1 :
159 case FDDI_FC_LLC_ASYNC + 2 :
160 case FDDI_FC_LLC_ASYNC + 3 :
161 case FDDI_FC_LLC_ASYNC + 4 :
162 case FDDI_FC_LLC_ASYNC + 5 :
163 case FDDI_FC_LLC_ASYNC + 6 :
164 case FDDI_FC_LLC_ASYNC + 7 :
165 case FDDI_FC_LLC_ASYNC + 8 :
166 case FDDI_FC_LLC_ASYNC + 9 :
167 case FDDI_FC_LLC_ASYNC + 10 :
168 case FDDI_FC_LLC_ASYNC + 11 :
169 case FDDI_FC_LLC_ASYNC + 12 :
170 case FDDI_FC_LLC_ASYNC + 13 :
171 case FDDI_FC_LLC_ASYNC + 14 :
172 case FDDI_FC_LLC_ASYNC + 15 :
173 capture_llc(pd, offset, ld);
184 fddifc_to_str(int fc)
186 static gchar strbuf[128+1];
190 case FDDI_FC_VOID: /* Void frame */
193 case FDDI_FC_NRT: /* Nonrestricted token */
194 return "Nonrestricted token";
196 case FDDI_FC_RT: /* Restricted token */
197 return "Restricted token";
199 case FDDI_FC_SMT_INFO: /* SMT Info */
202 case FDDI_FC_SMT_NSA: /* SMT Next station adrs */
203 return "SMT Next station address";
205 case FDDI_FC_MAC_BEACON: /* MAC Beacon frame */
208 case FDDI_FC_MAC_CLAIM: /* MAC Claim frame */
209 return "MAC claim token";
212 switch (fc & FDDI_FC_CLFF) {
215 sprintf(strbuf, "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
219 sprintf(strbuf, "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
222 case FDDI_FC_LLC_ASYNC:
223 if (fc & FDDI_FC_ASYNC_R)
224 sprintf(strbuf, "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
226 sprintf(strbuf, "Async LLC frame, priority %d",
227 fc & FDDI_FC_ASYNC_PRI);
230 case FDDI_FC_LLC_SYNC:
231 if (fc & FDDI_FC_ZZZZ) {
232 sprintf(strbuf, "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
235 return "Sync LLC frame";
237 case FDDI_FC_IMP_ASYNC:
238 sprintf(strbuf, "Implementor async frame, control %x",
242 case FDDI_FC_IMP_SYNC:
243 sprintf(strbuf, "Implementor sync frame, control %x",
249 return "Unknown frame type";
254 void dissect_fddi(const u_char *pd, frame_data *fd, proto_tree *tree,
261 static u_char src[6], dst[6];
262 u_char src_swapped[6], dst_swapped[6];
264 if (!BYTES_ARE_IN_FRAME(0, FDDI_HEADER_SIZE)) {
265 dissect_data(pd, offset, fd, tree);
269 /* Extract the source and destination addresses, possibly bit-swapping
272 swap_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]);
273 swap_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]);
275 memcpy(dst, (u_char *)&pd[FDDI_P_DHOST], sizeof dst);
276 memcpy(src, (u_char *)&pd[FDDI_P_SHOST], sizeof src);
279 fc = (int) pd[FDDI_P_FC];
280 fc_str = fddifc_to_str(fc);
282 /* XXX - copy them to some buffer associated with "pi", rather than
283 just making "src" and "dst" static? */
284 SET_ADDRESS(&pi.dl_src, AT_ETHER, 6, &src[0]);
285 SET_ADDRESS(&pi.src, AT_ETHER, 6, &src[0]);
286 SET_ADDRESS(&pi.dl_dst, AT_ETHER, 6, &dst[0]);
287 SET_ADDRESS(&pi.dst, AT_ETHER, 6, &dst[0]);
289 if (check_col(fd, COL_PROTOCOL))
290 col_add_str(fd, COL_PROTOCOL, "FDDI");
291 if (check_col(fd, COL_INFO))
292 col_add_str(fd, COL_INFO, fc_str);
294 offset = FDDI_HEADER_SIZE;
297 ti = proto_tree_add_item_format(tree, proto_fddi, 0, offset, NULL,
298 "Fiber Distributed Data Interface, %s", fc_str);
300 swap_mac_addr(dst_swapped, (u_char*)&pd[FDDI_P_DHOST]);
301 swap_mac_addr(src_swapped, (u_char*)&pd[FDDI_P_SHOST]);
303 fh_tree = proto_item_add_subtree(ti, ett_fddi);
304 proto_tree_add_item(fh_tree, hf_fddi_fc, FDDI_P_FC, 1, fc);
305 proto_tree_add_item(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst);
306 proto_tree_add_item(fh_tree, hf_fddi_src, FDDI_P_SHOST, 6, src);
308 /* hide some bit-swapped mac address fields in the proto_tree, just in case */
309 proto_tree_add_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst_swapped);
310 proto_tree_add_item_hidden(fh_tree, hf_fddi_src, FDDI_P_SHOST, 6, src_swapped);
315 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
317 case FDDI_FC_LLC_ASYNC + 0 :
318 case FDDI_FC_LLC_ASYNC + 1 :
319 case FDDI_FC_LLC_ASYNC + 2 :
320 case FDDI_FC_LLC_ASYNC + 3 :
321 case FDDI_FC_LLC_ASYNC + 4 :
322 case FDDI_FC_LLC_ASYNC + 5 :
323 case FDDI_FC_LLC_ASYNC + 6 :
324 case FDDI_FC_LLC_ASYNC + 7 :
325 case FDDI_FC_LLC_ASYNC + 8 :
326 case FDDI_FC_LLC_ASYNC + 9 :
327 case FDDI_FC_LLC_ASYNC + 10 :
328 case FDDI_FC_LLC_ASYNC + 11 :
329 case FDDI_FC_LLC_ASYNC + 12 :
330 case FDDI_FC_LLC_ASYNC + 13 :
331 case FDDI_FC_LLC_ASYNC + 14 :
332 case FDDI_FC_LLC_ASYNC + 15 :
333 dissect_llc(pd, offset, fd, tree);
337 dissect_data(pd, offset, fd, tree);
344 proto_register_fddi(void)
346 static hf_register_info hf[] = {
349 * XXX - we want this guy to have his own private formatting
350 * routine, using "fc_to_str()"; if "fc_to_str()" returns
351 * NULL, just show the hex value, else show the string.
354 { "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
358 { "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
359 "Destination Hardware Address" }},
362 { "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
365 static gint *ett[] = {
369 proto_fddi = proto_register_protocol ("Fiber Distributed Data Interface", "fddi" );
370 proto_register_field_array(proto_fddi, hf, array_length(hf));
371 proto_register_subtree_array(ett, array_length(ett));