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 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 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