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1 office 1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Hacked version of print-ether.c Larry Lile <lile@stdio.com>
22 *
23 * Further tweaked to more closely resemble print-fddi.c
24 * Guy Harris <guy@alum.mit.edu>
25 */
26  
27 #define NETDISSECT_REWORKED
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31  
32 #include <tcpdump-stdinc.h>
33  
34 #include <string.h>
35  
36 #include "interface.h"
37 #include "extract.h"
38 #include "addrtoname.h"
39 #include "ether.h"
40  
41 /*
42 * Copyright (c) 1998, Larry Lile
43 * All rights reserved.
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice unmodified, this list of conditions, and the following
50 * disclaimer.
51 * 2. Redistributions in binary form must reproduce the above copyright
52 * notice, this list of conditions and the following disclaimer in the
53 * documentation and/or other materials provided with the distribution.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 */
68  
69 #define TOKEN_HDRLEN 14
70 #define TOKEN_RING_MAC_LEN 6
71 #define ROUTING_SEGMENT_MAX 16
72 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
73 #define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
74 #define TOKEN_FC_LLC 1
75  
76 #define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
77 #define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
78 #define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
79 #define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
80 #define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
81 #define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
82 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
83  
84 struct token_header {
85 uint8_t token_ac;
86 uint8_t token_fc;
87 uint8_t token_dhost[TOKEN_RING_MAC_LEN];
88 uint8_t token_shost[TOKEN_RING_MAC_LEN];
89 uint16_t token_rcf;
90 uint16_t token_rseg[ROUTING_SEGMENT_MAX];
91 };
92  
93 static const char tstr[] = "[|token-ring]";
94  
95 /* Extract src, dst addresses */
96 static inline void
97 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
98 {
99 memcpy(fdst, (const char *)trp->token_dhost, 6);
100 memcpy(fsrc, (const char *)trp->token_shost, 6);
101 }
102  
103 /*
104 * Print the TR MAC header
105 */
106 static inline void
107 token_hdr_print(netdissect_options *ndo,
108 register const struct token_header *trp, register u_int length,
109 register const u_char *fsrc, register const u_char *fdst)
110 {
111 const char *srcname, *dstname;
112  
113 srcname = etheraddr_string(ndo, fsrc);
114 dstname = etheraddr_string(ndo, fdst);
115  
116 if (ndo->ndo_vflag)
117 ND_PRINT((ndo, "%02x %02x %s %s %d: ",
118 trp->token_ac,
119 trp->token_fc,
120 srcname, dstname,
121 length));
122 else
123 ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
124 }
125  
126 static const char *broadcast_indicator[] = {
127 "Non-Broadcast", "Non-Broadcast",
128 "Non-Broadcast", "Non-Broadcast",
129 "All-routes", "All-routes",
130 "Single-route", "Single-route"
131 };
132  
133 static const char *direction[] = {
134 "Forward", "Backward"
135 };
136  
137 static const char *largest_frame[] = {
138 "516",
139 "1500",
140 "2052",
141 "4472",
142 "8144",
143 "11407",
144 "17800",
145 "??"
146 };
147  
148 u_int
149 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
150 {
151 const struct token_header *trp;
152 u_short extracted_ethertype;
153 struct ether_header ehdr;
154 u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
155 int seg;
156  
157 trp = (const struct token_header *)p;
158  
159 if (caplen < TOKEN_HDRLEN) {
160 ND_PRINT((ndo, "%s", tstr));
161 return hdr_len;
162 }
163  
164 /*
165 * Get the TR addresses into a canonical form
166 */
167 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
168  
169 /* Adjust for source routing information in the MAC header */
170 if (IS_SOURCE_ROUTED(trp)) {
171 /* Clear source-routed bit */
172 *ESRC(&ehdr) &= 0x7f;
173  
174 if (ndo->ndo_eflag)
175 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
176  
177 if (caplen < TOKEN_HDRLEN + 2) {
178 ND_PRINT((ndo, "%s", tstr));
179 return hdr_len;
180 }
181 route_len = RIF_LENGTH(trp);
182 hdr_len += route_len;
183 if (caplen < hdr_len) {
184 ND_PRINT((ndo, "%s", tstr));
185 return hdr_len;
186 }
187 if (ndo->ndo_vflag) {
188 ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
189 ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
190  
191 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
192 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
193 BRIDGE_NUMBER(trp, seg)));
194 } else {
195 ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
196  
197 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
198 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
199 }
200 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
201 } else {
202 if (ndo->ndo_eflag)
203 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
204 }
205  
206 /* Skip over token ring MAC header and routing information */
207 length -= hdr_len;
208 p += hdr_len;
209 caplen -= hdr_len;
210  
211 /* Frame Control field determines interpretation of packet */
212 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
213 /* Try to print the LLC-layer header & higher layers */
214 if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
215 &extracted_ethertype) == 0) {
216 /* ether_type not known, print raw packet */
217 if (!ndo->ndo_eflag)
218 token_hdr_print(ndo, trp,
219 length + TOKEN_HDRLEN + route_len,
220 ESRC(&ehdr), EDST(&ehdr));
221 if (extracted_ethertype) {
222 ND_PRINT((ndo, "(LLC %s) ",
223 etherproto_string(htons(extracted_ethertype))));
224 }
225 if (!ndo->ndo_suppress_default_print)
226 ND_DEFAULTPRINT(p, caplen);
227 }
228 } else {
229 /* Some kinds of TR packet we cannot handle intelligently */
230 /* XXX - dissect MAC packets if frame type is 0 */
231 if (!ndo->ndo_eflag)
232 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
233 ESRC(&ehdr), EDST(&ehdr));
234 if (!ndo->ndo_suppress_default_print)
235 ND_DEFAULTPRINT(p, caplen);
236 }
237 return (hdr_len);
238 }
239  
240 /*
241 * This is the top level routine of the printer. 'p' points
242 * to the TR header of the packet, 'h->ts' is the timestamp,
243 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
244 * is the number of bytes actually captured.
245 */
246 u_int
247 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
248 {
249 return (token_print(ndo, p, h->len, h->caplen));
250 }