1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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#ifndef lint
22static const char rcsid[] _U_ =
23    "@(#) $Header: /tcpdump/master/tcpdump/print-ap1394.c,v 1.5 2006-02-11 22:12:06 hannes Exp $ (LBL)";
24#endif
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <tcpdump-stdinc.h>
31
32#include <stdio.h>
33#include <pcap.h>
34
35#include "interface.h"
36#include "extract.h"
37#include "addrtoname.h"
38#include "ethertype.h"
39
40/*
41 * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
42 */
43#define FIREWIRE_EUI64_LEN	8
44struct firewire_header {
45	u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
46	u_char  firewire_shost[FIREWIRE_EUI64_LEN];
47	u_short firewire_type;
48};
49
50/*
51 * Length of that header; note that some compilers may pad
52 * "struct firewire_header" to a multiple of 4 bytes, for example, so
53 * "sizeof (struct firewire_header)" may not give the right answer.
54 */
55#define FIREWIRE_HDRLEN		18
56
57static inline void
58ap1394_hdr_print(register const u_char *bp, u_int length)
59{
60	register const struct firewire_header *fp;
61	u_int16_t firewire_type;
62
63	fp = (const struct firewire_header *)bp;
64
65	(void)printf("%s > %s",
66		     linkaddr_string(fp->firewire_dhost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN),
67		     linkaddr_string(fp->firewire_shost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN));
68
69	firewire_type = EXTRACT_16BITS(&fp->firewire_type);
70	if (!qflag) {
71		(void)printf(", ethertype %s (0x%04x)",
72			       tok2str(ethertype_values,"Unknown", firewire_type),
73                               firewire_type);
74        } else {
75                (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
76        }
77
78	(void)printf(", length %u: ", length);
79}
80
81/*
82 * This is the top level routine of the printer.  'p' points
83 * to the ether header of the packet, 'h->ts' is the timestamp,
84 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
85 * is the number of bytes actually captured.
86 */
87u_int
88ap1394_if_print(const struct pcap_pkthdr *h, const u_char *p)
89{
90	u_int length = h->len;
91	u_int caplen = h->caplen;
92	struct firewire_header *fp;
93	u_short ether_type;
94
95	if (caplen < FIREWIRE_HDRLEN) {
96		printf("[|ap1394]");
97		return FIREWIRE_HDRLEN;
98	}
99
100	if (eflag)
101		ap1394_hdr_print(p, length);
102
103	length -= FIREWIRE_HDRLEN;
104	caplen -= FIREWIRE_HDRLEN;
105	fp = (struct firewire_header *)p;
106	p += FIREWIRE_HDRLEN;
107
108	ether_type = EXTRACT_16BITS(&fp->firewire_type);
109	if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
110		/* ether_type not known, print raw packet */
111		if (!eflag)
112			ap1394_hdr_print((u_char *)fp, length + FIREWIRE_HDRLEN);
113
114		if (!suppress_default_print)
115			default_print(p, caplen);
116	}
117
118	return FIREWIRE_HDRLEN;
119}
120