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 #include <sys/cdefs.h>
28 #ifndef lint
29 __RCSID("$NetBSD: print-token.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
30 #endif
31
32 #define NETDISSECT_REWORKED
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36
37 #include <tcpdump-stdinc.h>
38
39 #include <string.h>
40
41 #include "interface.h"
42 #include "extract.h"
43 #include "addrtoname.h"
44 #include "ether.h"
45
46 /*
47 * Copyright (c) 1998, Larry Lile
48 * All rights reserved.
49 *
50 * Redistribution and use in source and binary forms, with or without
51 * modification, are permitted provided that the following conditions
52 * are met:
53 * 1. Redistributions of source code must retain the above copyright
54 * notice unmodified, this list of conditions, and the following
55 * disclaimer.
56 * 2. Redistributions in binary form must reproduce the above copyright
57 * notice, this list of conditions and the following disclaimer in the
58 * documentation and/or other materials provided with the distribution.
59 *
60 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 *
72 */
73
74 #define TOKEN_HDRLEN 14
75 #define TOKEN_RING_MAC_LEN 6
76 #define ROUTING_SEGMENT_MAX 16
77 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
78 #define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
79 #define TOKEN_FC_LLC 1
80
81 #define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
82 #define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
83 #define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
84 #define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
85 #define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
86 #define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
87 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
88
89 struct token_header {
90 uint8_t token_ac;
91 uint8_t token_fc;
92 uint8_t token_dhost[TOKEN_RING_MAC_LEN];
93 uint8_t token_shost[TOKEN_RING_MAC_LEN];
94 uint16_t token_rcf;
95 uint16_t token_rseg[ROUTING_SEGMENT_MAX];
96 };
97
98 static const char tstr[] = "[|token-ring]";
99
100 /* Extract src, dst addresses */
101 static inline void
extract_token_addrs(const struct token_header * trp,char * fsrc,char * fdst)102 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
103 {
104 memcpy(fdst, (const char *)trp->token_dhost, 6);
105 memcpy(fsrc, (const char *)trp->token_shost, 6);
106 }
107
108 /*
109 * Print the TR MAC header
110 */
111 static inline void
token_hdr_print(netdissect_options * ndo,register const struct token_header * trp,register u_int length,register const u_char * fsrc,register const u_char * fdst)112 token_hdr_print(netdissect_options *ndo,
113 register const struct token_header *trp, register u_int length,
114 register const u_char *fsrc, register const u_char *fdst)
115 {
116 const char *srcname, *dstname;
117
118 srcname = etheraddr_string(ndo, fsrc);
119 dstname = etheraddr_string(ndo, fdst);
120
121 if (ndo->ndo_vflag)
122 ND_PRINT((ndo, "%02x %02x %s %s %d: ",
123 trp->token_ac,
124 trp->token_fc,
125 srcname, dstname,
126 length));
127 else
128 ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
129 }
130
131 static const char *broadcast_indicator[] = {
132 "Non-Broadcast", "Non-Broadcast",
133 "Non-Broadcast", "Non-Broadcast",
134 "All-routes", "All-routes",
135 "Single-route", "Single-route"
136 };
137
138 static const char *direction[] = {
139 "Forward", "Backward"
140 };
141
142 static const char *largest_frame[] = {
143 "516",
144 "1500",
145 "2052",
146 "4472",
147 "8144",
148 "11407",
149 "17800",
150 "??"
151 };
152
153 u_int
token_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)154 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
155 {
156 const struct token_header *trp;
157 u_short extracted_ethertype;
158 struct ether_header ehdr;
159 u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
160 int seg;
161
162 trp = (const struct token_header *)p;
163
164 if (caplen < TOKEN_HDRLEN) {
165 ND_PRINT((ndo, "%s", tstr));
166 return hdr_len;
167 }
168
169 /*
170 * Get the TR addresses into a canonical form
171 */
172 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
173
174 /* Adjust for source routing information in the MAC header */
175 if (IS_SOURCE_ROUTED(trp)) {
176 /* Clear source-routed bit */
177 *ESRC(&ehdr) &= 0x7f;
178
179 if (ndo->ndo_eflag)
180 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
181
182 if (caplen < TOKEN_HDRLEN + 2) {
183 ND_PRINT((ndo, "%s", tstr));
184 return hdr_len;
185 }
186 route_len = RIF_LENGTH(trp);
187 hdr_len += route_len;
188 if (caplen < hdr_len) {
189 ND_PRINT((ndo, "%s", tstr));
190 return hdr_len;
191 }
192 if (ndo->ndo_vflag) {
193 ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
194 ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
195
196 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
197 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
198 BRIDGE_NUMBER(trp, seg)));
199 } else {
200 ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
201
202 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
203 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
204 }
205 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
206 } else {
207 if (ndo->ndo_eflag)
208 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
209 }
210
211 /* Skip over token ring MAC header and routing information */
212 length -= hdr_len;
213 p += hdr_len;
214 caplen -= hdr_len;
215
216 /* Frame Control field determines interpretation of packet */
217 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
218 /* Try to print the LLC-layer header & higher layers */
219 if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
220 &extracted_ethertype) == 0) {
221 /* ether_type not known, print raw packet */
222 if (!ndo->ndo_eflag)
223 token_hdr_print(ndo, trp,
224 length + TOKEN_HDRLEN + route_len,
225 ESRC(&ehdr), EDST(&ehdr));
226 if (extracted_ethertype) {
227 ND_PRINT((ndo, "(LLC %s) ",
228 etherproto_string(htons(extracted_ethertype))));
229 }
230 if (!ndo->ndo_suppress_default_print)
231 ND_DEFAULTPRINT(p, caplen);
232 }
233 } else {
234 /* Some kinds of TR packet we cannot handle intelligently */
235 /* XXX - dissect MAC packets if frame type is 0 */
236 if (!ndo->ndo_eflag)
237 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
238 ESRC(&ehdr), EDST(&ehdr));
239 if (!ndo->ndo_suppress_default_print)
240 ND_DEFAULTPRINT(p, caplen);
241 }
242 return (hdr_len);
243 }
244
245 /*
246 * This is the top level routine of the printer. 'p' points
247 * to the TR header of the packet, 'h->ts' is the timestamp,
248 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
249 * is the number of bytes actually captured.
250 */
251 u_int
token_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)252 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
253 {
254 return (token_print(ndo, p, h->len, h->caplen));
255 }
256