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
22/* \summary: Apple IP-over-IEEE 1394 printer */
23
24#ifdef HAVE_CONFIG_H
25#include <config.h>
26#endif
27
28#include "netdissect-stdinc.h"
29
30#define ND_LONGJMP_FROM_TCHECK
31#include "netdissect.h"
32#include "extract.h"
33#include "addrtoname.h"
34#include "ethertype.h"
35
36/*
37 * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
38 */
39#define FIREWIRE_EUI64_LEN	8
40struct firewire_header {
41	nd_byte     firewire_dhost[FIREWIRE_EUI64_LEN];
42	nd_byte     firewire_shost[FIREWIRE_EUI64_LEN];
43	nd_uint16_t firewire_type;
44};
45
46/*
47 * Length of that header; note that some compilers may pad
48 * "struct firewire_header" to a multiple of 4 bytes, for example, so
49 * "sizeof (struct firewire_header)" may not give the right answer.
50 */
51#define FIREWIRE_HDRLEN		18
52
53static const char *
54fwaddr_string(netdissect_options *ndo, const u_char *addr)
55{
56	return GET_LINKADDR_STRING(addr, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN);
57}
58
59static void
60ap1394_hdr_print(netdissect_options *ndo, const u_char *bp, u_int length)
61{
62	const struct firewire_header *fp;
63	uint16_t firewire_type;
64
65	fp = (const struct firewire_header *)bp;
66
67	ND_PRINT("%s > %s",
68		     fwaddr_string(ndo, fp->firewire_shost),
69		     fwaddr_string(ndo, fp->firewire_dhost));
70
71	firewire_type = GET_BE_U_2(fp->firewire_type);
72	if (!ndo->ndo_qflag) {
73		ND_PRINT(", ethertype %s (0x%04x)",
74			       tok2str(ethertype_values,"Unknown", firewire_type),
75                               firewire_type);
76        } else {
77                ND_PRINT(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type));
78        }
79
80	ND_PRINT(", length %u: ", length);
81}
82
83/*
84 * This is the top level routine of the printer.  'p' points
85 * to the ether header of the packet, 'h->ts' is the timestamp,
86 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
87 * is the number of bytes actually captured.
88 */
89void
90ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
91{
92	u_int length = h->len;
93	u_int caplen = h->caplen;
94	const struct firewire_header *fp;
95	u_short ether_type;
96	struct lladdr_info src, dst;
97
98	ndo->ndo_protocol = "ap1394";
99	ND_TCHECK_LEN(p, FIREWIRE_HDRLEN);
100	ndo->ndo_ll_hdr_len += FIREWIRE_HDRLEN;
101
102	if (ndo->ndo_eflag)
103		ap1394_hdr_print(ndo, p, length);
104
105	length -= FIREWIRE_HDRLEN;
106	caplen -= FIREWIRE_HDRLEN;
107	fp = (const struct firewire_header *)p;
108	p += FIREWIRE_HDRLEN;
109
110	ether_type = GET_BE_U_2(fp->firewire_type);
111	src.addr = fp->firewire_shost;
112	src.addr_string = fwaddr_string;
113	dst.addr = fp->firewire_dhost;
114	dst.addr_string = fwaddr_string;
115	if (ethertype_print(ndo, ether_type, p, length, caplen, &src, &dst) == 0) {
116		/* ether_type not known, print raw packet */
117		if (!ndo->ndo_eflag)
118			ap1394_hdr_print(ndo, (const u_char *)fp, length + FIREWIRE_HDRLEN);
119
120		if (!ndo->ndo_suppress_default_print)
121			ND_DEFAULTPRINT(p, caplen);
122	}
123}
124