2 * Routines for FDDI packet disassembly
4 * Laurent Deniel <deniel@worldnet.fr>
6 * $Id: packet-fddi.c,v 1.22 1999/10/12 06:20:05 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>
41 static int proto_fddi = -1;
42 static int hf_fddi_fc = -1;
43 static int hf_fddi_dst = -1;
44 static int hf_fddi_src = -1;
46 /* FDDI Frame Control values */
48 #define FDDI_FC_VOID 0x00 /* Void frame */
49 #define FDDI_FC_NRT 0x80 /* Nonrestricted token */
50 #define FDDI_FC_RT 0xc0 /* Restricted token */
51 #define FDDI_FC_MAC 0xc0 /* MAC frame */
52 #define FDDI_FC_SMT 0x40 /* SMT frame */
53 #define FDDI_FC_SMT_INFO 0x41 /* SMT Info */
54 #define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */
55 #define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO
56 #define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA
57 #define FDDI_FC_MAC_MIN 0xc1
58 #define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */
59 #define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */
60 #define FDDI_FC_MAC_MAX 0xcf
61 #define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */
62 #define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC
63 #define FDDI_FC_LLC_ASYNC_DEF 0x54
64 #define FDDI_FC_LLC_ASYNC_MAX 0x5f
65 #define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */
66 #define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC
67 #define FDDI_FC_LLC_SYNC_MAX 0xd7
68 #define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */
69 #define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC
70 #define FDDI_FC_IMP_ASYNC_MAX 0x6f
71 #define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */
73 #define FDDI_FC_CLFF 0xF0 /* Class/Length/Format bits */
74 #define FDDI_FC_ZZZZ 0x0F /* Control bits */
77 * Async frame ZZZZ bits:
79 #define FDDI_FC_ASYNC_R 0x08 /* Reserved */
80 #define FDDI_FC_ASYNC_PRI 0x07 /* Priority */
82 #define FDDI_HEADER_SIZE 13
87 #define FDDI_P_DHOST 1
88 #define FDDI_P_SHOST 7
90 /* "swaptab[i]" is the value of "i" with the bits reversed. */
91 static u_char swaptab[256] = {
92 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
93 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
94 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
95 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
96 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
97 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
98 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
99 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
100 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
101 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
102 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
103 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
104 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
105 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
106 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
107 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
108 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
109 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
110 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
111 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
112 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
113 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
114 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
115 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
116 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
117 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
118 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
119 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
120 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
121 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
122 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
123 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
127 swap_mac_addr(u_char *swapped_addr, const u_char *orig_addr)
131 for (i = 0; i < 6; i++) {
132 swapped_addr[i] = swaptab[orig_addr[i]];
138 capture_fddi(const u_char *pd, guint32 cap_len, packet_counts *ld) {
141 if (cap_len < FDDI_HEADER_SIZE) {
145 offset = FDDI_HEADER_SIZE;
147 fc = (int) pd[FDDI_P_FC];
151 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
153 case FDDI_FC_LLC_ASYNC + 0 :
154 case FDDI_FC_LLC_ASYNC + 1 :
155 case FDDI_FC_LLC_ASYNC + 2 :
156 case FDDI_FC_LLC_ASYNC + 3 :
157 case FDDI_FC_LLC_ASYNC + 4 :
158 case FDDI_FC_LLC_ASYNC + 5 :
159 case FDDI_FC_LLC_ASYNC + 6 :
160 case FDDI_FC_LLC_ASYNC + 7 :
161 case FDDI_FC_LLC_ASYNC + 8 :
162 case FDDI_FC_LLC_ASYNC + 9 :
163 case FDDI_FC_LLC_ASYNC + 10 :
164 case FDDI_FC_LLC_ASYNC + 11 :
165 case FDDI_FC_LLC_ASYNC + 12 :
166 case FDDI_FC_LLC_ASYNC + 13 :
167 case FDDI_FC_LLC_ASYNC + 14 :
168 case FDDI_FC_LLC_ASYNC + 15 :
169 capture_llc(pd, offset, cap_len, ld);
180 fddifc_to_str(int fc)
182 static gchar strbuf[128+1];
186 case FDDI_FC_VOID: /* Void frame */
189 case FDDI_FC_NRT: /* Nonrestricted token */
190 return "Nonrestricted token";
192 case FDDI_FC_RT: /* Restricted token */
193 return "Restricted token";
195 case FDDI_FC_SMT_INFO: /* SMT Info */
198 case FDDI_FC_SMT_NSA: /* SMT Next station adrs */
199 return "SMT Next station address";
201 case FDDI_FC_MAC_BEACON: /* MAC Beacon frame */
204 case FDDI_FC_MAC_CLAIM: /* MAC Claim frame */
205 return "MAC claim token";
208 switch (fc & FDDI_FC_CLFF) {
211 sprintf(strbuf, "MAC frame, control %x", fc & FDDI_FC_ZZZZ);
215 sprintf(strbuf, "SMT frame, control %x", fc & FDDI_FC_ZZZZ);
218 case FDDI_FC_LLC_ASYNC:
219 if (fc & FDDI_FC_ASYNC_R)
220 sprintf(strbuf, "Async LLC frame, control %x", fc & FDDI_FC_ZZZZ);
222 sprintf(strbuf, "Async LLC frame, priority %d",
223 fc & FDDI_FC_ASYNC_PRI);
226 case FDDI_FC_LLC_SYNC:
227 if (fc & FDDI_FC_ZZZZ) {
228 sprintf(strbuf, "Sync LLC frame, control %x", fc & FDDI_FC_ZZZZ);
231 return "Sync LLC frame";
233 case FDDI_FC_IMP_ASYNC:
234 sprintf(strbuf, "Implementor async frame, control %x",
238 case FDDI_FC_IMP_SYNC:
239 sprintf(strbuf, "Implementor sync frame, control %x",
245 return "Unknown frame type";
250 void dissect_fddi(const u_char *pd, frame_data *fd, proto_tree *tree,
257 u_char src[6], dst[6];
258 u_char src_swapped[6], dst_swapped[6];
260 if (fd->cap_len < FDDI_HEADER_SIZE) {
261 dissect_data(pd, offset, fd, tree);
265 /* Extract the source and destination addresses, possibly bit-swapping
268 swap_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]);
269 swap_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]);
271 memcpy(dst, (u_char *)&pd[FDDI_P_DHOST], sizeof dst);
272 memcpy(src, (u_char *)&pd[FDDI_P_SHOST], sizeof src);
275 fc = (int) pd[FDDI_P_FC];
276 fc_str = fddifc_to_str(fc);
278 if (check_col(fd, COL_RES_DL_SRC))
279 col_add_str(fd, COL_RES_DL_SRC, get_ether_name(src));
280 if (check_col(fd, COL_RES_DL_DST))
281 col_add_str(fd, COL_RES_DL_DST, get_ether_name(dst));
282 if (check_col(fd, COL_UNRES_DL_SRC))
283 col_add_str(fd, COL_UNRES_DL_SRC, ether_to_str(src));
284 if (check_col(fd, COL_UNRES_DL_DST))
285 col_add_str(fd, COL_UNRES_DL_DST, ether_to_str(dst));
286 if (check_col(fd, COL_PROTOCOL))
287 col_add_str(fd, COL_PROTOCOL, "FDDI");
288 if (check_col(fd, COL_INFO))
289 col_add_str(fd, COL_INFO, fc_str);
291 offset = FDDI_HEADER_SIZE;
294 ti = proto_tree_add_item_format(tree, proto_fddi, 0, offset, NULL,
295 "Fiber Distributed Data Interface, %s", fc_str);
297 swap_mac_addr(dst_swapped, (u_char*)&pd[FDDI_P_DHOST]);
298 swap_mac_addr(src_swapped, (u_char*)&pd[FDDI_P_SHOST]);
300 fh_tree = proto_item_add_subtree(ti, ETT_FDDI);
301 proto_tree_add_item(fh_tree, hf_fddi_fc, FDDI_P_FC, 1, fc);
302 proto_tree_add_item(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst);
303 proto_tree_add_item(fh_tree, hf_fddi_src, FDDI_P_SHOST, 6, src);
305 /* hide some bit-swapped mac address fields in the proto_tree, just in case */
306 proto_tree_add_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_DHOST, 6, dst_swapped);
307 proto_tree_add_item_hidden(fh_tree, hf_fddi_dst, FDDI_P_SHOST, 6, src_swapped);
312 /* From now, only 802.2 SNAP (Async. LCC frame) is supported */
314 case FDDI_FC_LLC_ASYNC + 0 :
315 case FDDI_FC_LLC_ASYNC + 1 :
316 case FDDI_FC_LLC_ASYNC + 2 :
317 case FDDI_FC_LLC_ASYNC + 3 :
318 case FDDI_FC_LLC_ASYNC + 4 :
319 case FDDI_FC_LLC_ASYNC + 5 :
320 case FDDI_FC_LLC_ASYNC + 6 :
321 case FDDI_FC_LLC_ASYNC + 7 :
322 case FDDI_FC_LLC_ASYNC + 8 :
323 case FDDI_FC_LLC_ASYNC + 9 :
324 case FDDI_FC_LLC_ASYNC + 10 :
325 case FDDI_FC_LLC_ASYNC + 11 :
326 case FDDI_FC_LLC_ASYNC + 12 :
327 case FDDI_FC_LLC_ASYNC + 13 :
328 case FDDI_FC_LLC_ASYNC + 14 :
329 case FDDI_FC_LLC_ASYNC + 15 :
330 dissect_llc(pd, offset, fd, tree);
334 dissect_data(pd, offset, fd, tree);
341 proto_register_fddi(void)
343 static hf_register_info hf[] = {
346 * XXX - we want this guy to have his own private formatting
347 * routine, using "fc_to_str()"; if "fc_to_str()" returns
348 * NULL, just show the hex value, else show the string.
351 { "Frame Control", "fddi.fc", FT_UINT8, BASE_HEX, NULL, 0x0,
355 { "Destination", "fddi.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
356 "Destination Hardware Address" }},
359 { "Source", "fddi.src", FT_ETHER, BASE_NONE, NULL, 0x0,
363 proto_fddi = proto_register_protocol ("Fiber Distributed Data Interface", "fddi" );
364 proto_register_field_array(proto_fddi, hf, array_length(hf));