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 #include <sys/cdefs.h>
22 #ifndef lint
23 __RCSID("$NetBSD: print-ap1394.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
24 #endif
25
26 #define NETDISSECT_REWORKED
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <tcpdump-stdinc.h>
32
33 #include "interface.h"
34 #include "extract.h"
35 #include "addrtoname.h"
36 #include "ethertype.h"
37
38 /*
39 * Structure of a header for Apple's IP-over-IEEE 1384 BPF header.
40 */
41 #define FIREWIRE_EUI64_LEN 8
42 struct firewire_header {
43 u_char firewire_dhost[FIREWIRE_EUI64_LEN];
44 u_char firewire_shost[FIREWIRE_EUI64_LEN];
45 u_short firewire_type;
46 };
47
48 /*
49 * Length of that header; note that some compilers may pad
50 * "struct firewire_header" to a multiple of 4 bytes, for example, so
51 * "sizeof (struct firewire_header)" may not give the right answer.
52 */
53 #define FIREWIRE_HDRLEN 18
54
55 static inline void
ap1394_hdr_print(netdissect_options * ndo,register const u_char * bp,u_int length)56 ap1394_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
57 {
58 register const struct firewire_header *fp;
59 uint16_t firewire_type;
60
61 fp = (const struct firewire_header *)bp;
62
63 ND_PRINT((ndo, "%s > %s",
64 linkaddr_string(ndo, fp->firewire_dhost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN),
65 linkaddr_string(ndo, fp->firewire_shost, LINKADDR_IEEE1394, FIREWIRE_EUI64_LEN)));
66
67 firewire_type = EXTRACT_16BITS(&fp->firewire_type);
68 if (!ndo->ndo_qflag) {
69 ND_PRINT((ndo, ", ethertype %s (0x%04x)",
70 tok2str(ethertype_values,"Unknown", firewire_type),
71 firewire_type));
72 } else {
73 ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", firewire_type)));
74 }
75
76 ND_PRINT((ndo, ", length %u: ", length));
77 }
78
79 /*
80 * This is the top level routine of the printer. 'p' points
81 * to the ether header of the packet, 'h->ts' is the timestamp,
82 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
83 * is the number of bytes actually captured.
84 */
85 u_int
ap1394_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)86 ap1394_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
87 {
88 u_int length = h->len;
89 u_int caplen = h->caplen;
90 struct firewire_header *fp;
91 u_short ether_type;
92
93 if (caplen < FIREWIRE_HDRLEN) {
94 ND_PRINT((ndo, "[|ap1394]"));
95 return FIREWIRE_HDRLEN;
96 }
97
98 if (ndo->ndo_eflag)
99 ap1394_hdr_print(ndo, p, length);
100
101 length -= FIREWIRE_HDRLEN;
102 caplen -= FIREWIRE_HDRLEN;
103 fp = (struct firewire_header *)p;
104 p += FIREWIRE_HDRLEN;
105
106 ether_type = EXTRACT_16BITS(&fp->firewire_type);
107 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
108 /* ether_type not known, print raw packet */
109 if (!ndo->ndo_eflag)
110 ap1394_hdr_print(ndo, (u_char *)fp, length + FIREWIRE_HDRLEN);
111
112 if (!ndo->ndo_suppress_default_print)
113 ND_DEFAULTPRINT(p, caplen);
114 }
115
116 return FIREWIRE_HDRLEN;
117 }
118