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 } 114