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 * $FreeBSD: head/contrib/tcpdump/print-token.c 162021 2006-09-04 20:25:04Z sam $
27 */
28#ifndef lint
29static const char rcsid[] _U_ =
30 "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.25.2.1 2005/07/07 01:24:40 guy Exp $";
31#endif
32
33#ifdef HAVE_CONFIG_H
34#include "config.h"
35#endif
36
37#include <tcpdump-stdinc.h>
38
39#include <pcap.h>
40#include <stdio.h>
41#include <string.h>
42
43#include "interface.h"
44#include "addrtoname.h"
45#include "ethertype.h"
46
47#include "ether.h"
48#include "token.h"
49
50/* Extract src, dst addresses */
51static inline void
52extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
53{
54 memcpy(fdst, (const char *)trp->token_dhost, 6);
55 memcpy(fsrc, (const char *)trp->token_shost, 6);
56}
57
58/*
59 * Print the TR MAC header
60 */
61static inline void
62token_hdr_print(register const struct token_header *trp, register u_int length,
63 register const u_char *fsrc, register const u_char *fdst)
64{
65 const char *srcname, *dstname;
66
67 srcname = etheraddr_string(fsrc);
68 dstname = etheraddr_string(fdst);
69
70 if (vflag)
71 (void) printf("%02x %02x %s %s %d: ",
72 trp->token_ac,
73 trp->token_fc,
74 srcname, dstname,
75 length);
76 else
77 printf("%s %s %d: ", srcname, dstname, length);
78}
79
80static const char *broadcast_indicator[] = {
81 "Non-Broadcast", "Non-Broadcast",
82 "Non-Broadcast", "Non-Broadcast",
83 "All-routes", "All-routes",
84 "Single-route", "Single-route"
85};
86
87static const char *direction[] = {
88 "Forward", "Backward"
89};
90
91static const char *largest_frame[] = {
92 "516",
93 "1500",
94 "2052",
95 "4472",
96 "8144",
97 "11407",
98 "17800",
99 "??"
100};
101
102u_int
103token_print(const u_char *p, u_int length, u_int caplen)
104{
105 const struct token_header *trp;
106 u_short extracted_ethertype;
107 struct ether_header ehdr;
108 u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
109 int seg;
110
111 trp = (const struct token_header *)p;
112
113 if (caplen < TOKEN_HDRLEN) {
114 printf("[|token-ring]");
115 return hdr_len;
116 }
117
118 /*
119 * Get the TR addresses into a canonical form
120 */
121 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
122
123 /* Adjust for source routing information in the MAC header */
124 if (IS_SOURCE_ROUTED(trp)) {
125 /* Clear source-routed bit */
126 *ESRC(&ehdr) &= 0x7f;
127
128 if (eflag)
129 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
130
131 route_len = RIF_LENGTH(trp);
132 if (vflag) {
133 printf("%s ", broadcast_indicator[BROADCAST(trp)]);
134 printf("%s", direction[DIRECTION(trp)]);
135
136 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
137 printf(" [%d:%d]", RING_NUMBER(trp, seg),
138 BRIDGE_NUMBER(trp, seg));
139 } else {
140 printf("rt = %x", ntohs(trp->token_rcf));
141
142 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
143 printf(":%x", ntohs(trp->token_rseg[seg]));
144 }
145 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
146 } else {
147 if (eflag)
148 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
149 }
150
151 /* Skip over token ring MAC header and routing information */
152 hdr_len += route_len;
153 length -= hdr_len;
154 p += hdr_len;
155 caplen -= hdr_len;
156
157 /* Frame Control field determines interpretation of packet */
158 extracted_ethertype = 0;
159 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
160 /* Try to print the LLC-layer header & higher layers */
161 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
162 &extracted_ethertype) == 0) {
163 /* ether_type not known, print raw packet */
164 if (!eflag)
165 token_hdr_print(trp,
166 length + TOKEN_HDRLEN + route_len,
167 ESRC(&ehdr), EDST(&ehdr));
168 if (extracted_ethertype) {
169 printf("(LLC %s) ",
170 etherproto_string(htons(extracted_ethertype)));
171 }
172 if (!suppress_default_print)
173 default_print(p, caplen);
174 }
175 } else {
176 /* Some kinds of TR packet we cannot handle intelligently */
177 /* XXX - dissect MAC packets if frame type is 0 */
178 if (!eflag)
179 token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
180 ESRC(&ehdr), EDST(&ehdr));
181 if (!suppress_default_print)
182 default_print(p, caplen);
183 }
184 return (hdr_len);
185}
186
187/*
188 * This is the top level routine of the printer. 'p' points
189 * to the TR header of the packet, 'h->ts' is the timestamp,
190 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
191 * is the number of bytes actually captured.
192 */
193u_int
194token_if_print(const struct pcap_pkthdr *h, const u_char *p)
195{
196 return (token_print(p, h->len, h->caplen));
197}