nexmon – Blame information for rev 1

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