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 /* \summary: IP over Fibre Channel printer */ 23 24 /* specification: RFC 2625 */ 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <netdissect-stdinc.h> 31 32 #include <string.h> 33 34 #include "netdissect.h" 35 #include "addrtoname.h" 36 37 #include "ether.h" 38 39 struct ipfc_header { 40 u_char ipfc_dhost[8]; 41 u_char ipfc_shost[8]; 42 }; 43 44 #define IPFC_HDRLEN 16 45 46 /* Extract src, dst addresses */ 47 static inline void 48 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc, 49 char *ipfcdst) 50 { 51 /* 52 * We assume that, as per RFC 2625, the lower 48 bits of the 53 * source and destination addresses are MAC addresses. 54 */ 55 memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6); 56 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6); 57 } 58 59 /* 60 * Print the Network_Header 61 */ 62 static inline void 63 ipfc_hdr_print(netdissect_options *ndo, 64 register const struct ipfc_header *ipfcp _U_, 65 register u_int length, register const u_char *ipfcsrc, 66 register const u_char *ipfcdst) 67 { 68 const char *srcname, *dstname; 69 70 srcname = etheraddr_string(ndo, ipfcsrc); 71 dstname = etheraddr_string(ndo, ipfcdst); 72 73 /* 74 * XXX - should we show the upper 16 bits of the addresses? 75 * Do so only if "vflag" is set? 76 * Section 3.3 "FC Port and Node Network Addresses" says that 77 * 78 * In this specification, both the Source and Destination 79 * 4-bit NAA identifiers SHALL be set to binary '0001' 80 * indicating that an IEEE 48-bit MAC address is contained 81 * in the lower 48 bits of the network address fields. The 82 * high order 12 bits in the network address fields SHALL 83 * be set to 0x0000. 84 * 85 * so, for captures following this specification, the upper 16 86 * bits should be 0x1000, followed by a MAC address. 87 */ 88 ND_PRINT((ndo, "%s > %s, length %u: ", srcname, dstname, length)); 89 } 90 91 static u_int 92 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 93 { 94 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p; 95 struct ether_header ehdr; 96 struct lladdr_info src, dst; 97 int llc_hdrlen; 98 99 if (caplen < IPFC_HDRLEN) { 100 ND_PRINT((ndo, "[|ipfc]")); 101 return (caplen); 102 } 103 /* 104 * Get the network addresses into a canonical form 105 */ 106 extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 107 108 if (ndo->ndo_eflag) 109 ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr)); 110 111 src.addr = ESRC(&ehdr); 112 src.addr_string = etheraddr_string; 113 dst.addr = EDST(&ehdr); 114 dst.addr_string = etheraddr_string; 115 116 /* Skip over Network_Header */ 117 length -= IPFC_HDRLEN; 118 p += IPFC_HDRLEN; 119 caplen -= IPFC_HDRLEN; 120 121 /* Try to print the LLC-layer header & higher layers */ 122 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 123 if (llc_hdrlen < 0) { 124 /* 125 * Some kinds of LLC packet we cannot 126 * handle intelligently 127 */ 128 if (!ndo->ndo_suppress_default_print) 129 ND_DEFAULTPRINT(p, caplen); 130 llc_hdrlen = -llc_hdrlen; 131 } 132 return (IPFC_HDRLEN + llc_hdrlen); 133 } 134 135 /* 136 * This is the top level routine of the printer. 'p' points 137 * to the Network_Header of the packet, 'h->ts' is the timestamp, 138 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 139 * is the number of bytes actually captured. 140 */ 141 u_int 142 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) 143 { 144 return (ipfc_print(ndo, p, h->len, h->caplen)); 145 } 146