1 /* 2 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997 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 <string.h> 30 31 #include "interface.h" 32 #include "addrtoname.h" 33 34 #include "ether.h" 35 36 /* 37 * RFC 2625 IP-over-Fibre Channel. 38 */ 39 40 struct ipfc_header { 41 u_char ipfc_dhost[8]; 42 u_char ipfc_shost[8]; 43 }; 44 45 #define IPFC_HDRLEN 16 46 47 /* Extract src, dst addresses */ 48 static inline void 49 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc, 50 char *ipfcdst) 51 { 52 /* 53 * We assume that, as per RFC 2625, the lower 48 bits of the 54 * source and destination addresses are MAC addresses. 55 */ 56 memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6); 57 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6); 58 } 59 60 /* 61 * Print the Network_Header 62 */ 63 static inline void 64 ipfc_hdr_print(netdissect_options *ndo, 65 register const struct ipfc_header *ipfcp _U_, 66 register u_int length, register const u_char *ipfcsrc, 67 register const u_char *ipfcdst) 68 { 69 const char *srcname, *dstname; 70 71 srcname = etheraddr_string(ndo, ipfcsrc); 72 dstname = etheraddr_string(ndo, ipfcdst); 73 74 /* 75 * XXX - show the upper 16 bits? Do so only if "vflag" is set? 76 */ 77 ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length)); 78 } 79 80 static void 81 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 82 { 83 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p; 84 struct ether_header ehdr; 85 u_short extracted_ethertype; 86 87 if (caplen < IPFC_HDRLEN) { 88 ND_PRINT((ndo, "[|ipfc]")); 89 return; 90 } 91 /* 92 * Get the network addresses into a canonical form 93 */ 94 extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 95 96 if (ndo->ndo_eflag) 97 ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr)); 98 99 /* Skip over Network_Header */ 100 length -= IPFC_HDRLEN; 101 p += IPFC_HDRLEN; 102 caplen -= IPFC_HDRLEN; 103 104 /* Try to print the LLC-layer header & higher layers */ 105 if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 106 &extracted_ethertype) == 0) { 107 /* 108 * Some kinds of LLC packet we cannot 109 * handle intelligently 110 */ 111 if (!ndo->ndo_eflag) 112 ipfc_hdr_print(ndo, ipfcp, length + IPFC_HDRLEN, 113 ESRC(&ehdr), EDST(&ehdr)); 114 if (extracted_ethertype) { 115 ND_PRINT((ndo, "(LLC %s) ", 116 etherproto_string(htons(extracted_ethertype)))); 117 } 118 if (!ndo->ndo_suppress_default_print) 119 ND_DEFAULTPRINT(p, caplen); 120 } 121 } 122 123 /* 124 * This is the top level routine of the printer. 'p' points 125 * to the Network_Header of the packet, 'h->ts' is the timestamp, 126 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 127 * is the number of bytes actually captured. 128 */ 129 u_int 130 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) 131 { 132 ipfc_print(ndo, p, h->len, h->caplen); 133 134 return (IPFC_HDRLEN); 135 } 136