print-token.c revision 162021 
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}
198