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#ifndef lint
27static const char rcsid[] _U_ =
28    "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $";
29#endif
30
31#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34
35#include <tcpdump-stdinc.h>
36
37#include <pcap.h>
38#include <stdio.h>
39#include <string.h>
40
41#include "interface.h"
42#include "extract.h"
43#include "addrtoname.h"
44#include "ethertype.h"
45
46#include "ether.h"
47#include "token.h"
48
49/* Extract src, dst addresses */
50static inline void
51extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
52{
53	memcpy(fdst, (const char *)trp->token_dhost, 6);
54	memcpy(fsrc, (const char *)trp->token_shost, 6);
55}
56
57/*
58 * Print the TR MAC header
59 */
60static inline void
61token_hdr_print(register const struct token_header *trp, register u_int length,
62	   register const u_char *fsrc, register const u_char *fdst)
63{
64	const char *srcname, *dstname;
65
66	srcname = etheraddr_string(fsrc);
67	dstname = etheraddr_string(fdst);
68
69	if (vflag)
70		(void) printf("%02x %02x %s %s %d: ",
71		       trp->token_ac,
72		       trp->token_fc,
73		       srcname, dstname,
74		       length);
75	else
76		printf("%s %s %d: ", srcname, dstname, length);
77}
78
79static const char *broadcast_indicator[] = {
80	"Non-Broadcast", "Non-Broadcast",
81	"Non-Broadcast", "Non-Broadcast",
82	"All-routes",    "All-routes",
83	"Single-route",  "Single-route"
84};
85
86static const char *direction[] = {
87	"Forward", "Backward"
88};
89
90static const char *largest_frame[] = {
91	"516",
92	"1500",
93	"2052",
94	"4472",
95	"8144",
96	"11407",
97	"17800",
98	"??"
99};
100
101u_int
102token_print(const u_char *p, u_int length, u_int caplen)
103{
104	const struct token_header *trp;
105	u_short extracted_ethertype;
106	struct ether_header ehdr;
107	u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
108	int seg;
109
110	trp = (const struct token_header *)p;
111
112	if (caplen < TOKEN_HDRLEN) {
113		printf("[|token-ring]");
114		return hdr_len;
115	}
116
117	/*
118	 * Get the TR addresses into a canonical form
119	 */
120	extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
121
122	/* Adjust for source routing information in the MAC header */
123	if (IS_SOURCE_ROUTED(trp)) {
124		/* Clear source-routed bit */
125		*ESRC(&ehdr) &= 0x7f;
126
127		if (eflag)
128			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
129
130		if (caplen < TOKEN_HDRLEN + 2) {
131			printf("[|token-ring]");
132			return hdr_len;
133		}
134		route_len = RIF_LENGTH(trp);
135		hdr_len += route_len;
136		if (caplen < hdr_len) {
137			printf("[|token-ring]");
138			return hdr_len;
139		}
140		if (vflag) {
141			printf("%s ", broadcast_indicator[BROADCAST(trp)]);
142			printf("%s", direction[DIRECTION(trp)]);
143
144			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
145				printf(" [%d:%d]", RING_NUMBER(trp, seg),
146				    BRIDGE_NUMBER(trp, seg));
147		} else {
148			printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
149
150			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
151				printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
152		}
153		printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
154	} else {
155		if (eflag)
156			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
157	}
158
159	/* Skip over token ring MAC header and routing information */
160	length -= hdr_len;
161	p += hdr_len;
162	caplen -= hdr_len;
163
164	/* Frame Control field determines interpretation of packet */
165	if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
166		/* Try to print the LLC-layer header & higher layers */
167		if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
168		    &extracted_ethertype) == 0) {
169			/* ether_type not known, print raw packet */
170			if (!eflag)
171				token_hdr_print(trp,
172				    length + TOKEN_HDRLEN + route_len,
173				    ESRC(&ehdr), EDST(&ehdr));
174			if (extracted_ethertype) {
175				printf("(LLC %s) ",
176			etherproto_string(htons(extracted_ethertype)));
177			}
178			if (!suppress_default_print)
179				default_print(p, caplen);
180		}
181	} else {
182		/* Some kinds of TR packet we cannot handle intelligently */
183		/* XXX - dissect MAC packets if frame type is 0 */
184		if (!eflag)
185			token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
186			    ESRC(&ehdr), EDST(&ehdr));
187		if (!suppress_default_print)
188			default_print(p, caplen);
189	}
190	return (hdr_len);
191}
192
193/*
194 * This is the top level routine of the printer.  'p' points
195 * to the TR header of the packet, 'h->ts' is the timestamp,
196 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
197 * is the number of bytes actually captured.
198 */
199u_int
200token_if_print(const struct pcap_pkthdr *h, const u_char *p)
201{
202	return (token_print(p, h->len, h->caplen));
203}
204