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 /* \summary: Token Ring printer */
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <netdissect-stdinc.h>
34
35 #include <string.h>
36
37 #include "netdissect.h"
38 #include "extract.h"
39 #include "addrtoname.h"
40 #include "ether.h"
41
42 /*
43 * Copyright (c) 1998, Larry Lile
44 * All rights reserved.
45 *
46 * Redistribution and use in source and binary forms, with or without
47 * modification, are permitted provided that the following conditions
48 * are met:
49 * 1. Redistributions of source code must retain the above copyright
50 * notice unmodified, this list of conditions, and the following
51 * disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 *
56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * SUCH DAMAGE.
67 *
68 */
69
70 #define TOKEN_HDRLEN 14
71 #define TOKEN_RING_MAC_LEN 6
72 #define ROUTING_SEGMENT_MAX 16
73 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
74 #define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
75 #define TOKEN_FC_LLC 1
76
77 #define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
78 #define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
79 #define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
80 #define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
81 #define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
82 #define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
83 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
84
85 struct token_header {
86 uint8_t token_ac;
87 uint8_t token_fc;
88 uint8_t token_dhost[TOKEN_RING_MAC_LEN];
89 uint8_t token_shost[TOKEN_RING_MAC_LEN];
90 uint16_t token_rcf;
91 uint16_t token_rseg[ROUTING_SEGMENT_MAX];
92 };
93
94 static const char tstr[] = "[|token-ring]";
95
96 /* Extract src, dst addresses */
97 static inline void
extract_token_addrs(const struct token_header * trp,char * fsrc,char * fdst)98 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
99 {
100 memcpy(fdst, (const char *)trp->token_dhost, 6);
101 memcpy(fsrc, (const char *)trp->token_shost, 6);
102 }
103
104 /*
105 * Print the TR MAC header
106 */
107 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)108 token_hdr_print(netdissect_options *ndo,
109 register const struct token_header *trp, register u_int length,
110 register const u_char *fsrc, register const u_char *fdst)
111 {
112 const char *srcname, *dstname;
113
114 srcname = etheraddr_string(ndo, fsrc);
115 dstname = etheraddr_string(ndo, fdst);
116
117 if (!ndo->ndo_qflag)
118 ND_PRINT((ndo, "%02x %02x ",
119 trp->token_ac,
120 trp->token_fc));
121 ND_PRINT((ndo, "%s > %s, length %u: ",
122 srcname, dstname,
123 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
token_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)149 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
150 {
151 const struct token_header *trp;
152 int llc_hdrlen;
153 struct ether_header ehdr;
154 struct lladdr_info src, dst;
155 u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
156 int seg;
157
158 trp = (const struct token_header *)p;
159
160 if (caplen < TOKEN_HDRLEN) {
161 ND_PRINT((ndo, "%s", tstr));
162 return hdr_len;
163 }
164
165 /*
166 * Get the TR addresses into a canonical form
167 */
168 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
169
170 /* Adjust for source routing information in the MAC header */
171 if (IS_SOURCE_ROUTED(trp)) {
172 /* Clear source-routed bit */
173 *ESRC(&ehdr) &= 0x7f;
174
175 if (ndo->ndo_eflag)
176 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
177
178 if (caplen < TOKEN_HDRLEN + 2) {
179 ND_PRINT((ndo, "%s", tstr));
180 return hdr_len;
181 }
182 route_len = RIF_LENGTH(trp);
183 hdr_len += route_len;
184 if (caplen < hdr_len) {
185 ND_PRINT((ndo, "%s", tstr));
186 return hdr_len;
187 }
188 if (ndo->ndo_vflag) {
189 ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
190 ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
191
192 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
193 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
194 BRIDGE_NUMBER(trp, seg)));
195 } else {
196 ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
197
198 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
199 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
200 }
201 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
202 } else {
203 if (ndo->ndo_eflag)
204 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
205 }
206
207 src.addr = ESRC(&ehdr);
208 src.addr_string = etheraddr_string;
209 dst.addr = EDST(&ehdr);
210 dst.addr_string = etheraddr_string;
211
212 /* Skip over token ring MAC header and routing information */
213 length -= hdr_len;
214 p += hdr_len;
215 caplen -= hdr_len;
216
217 /* Frame Control field determines interpretation of packet */
218 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
219 /* Try to print the LLC-layer header & higher layers */
220 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
221 if (llc_hdrlen < 0) {
222 /* packet type not known, print raw packet */
223 if (!ndo->ndo_suppress_default_print)
224 ND_DEFAULTPRINT(p, caplen);
225 llc_hdrlen = -llc_hdrlen;
226 }
227 hdr_len += llc_hdrlen;
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
token_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)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 }
251