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 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-ipfc.c,v 1.6 2017/02/05 04:05:05 spz Exp $"); 25 #endif 26 27 /* \summary: IP over Fibre Channel printer */ 28 29 /* specification: RFC 2625 */ 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <netdissect-stdinc.h> 36 37 #include <string.h> 38 39 #include "netdissect.h" 40 #include "addrtoname.h" 41 42 #include "ether.h" 43 44 struct ipfc_header { 45 u_char ipfc_dhost[8]; 46 u_char ipfc_shost[8]; 47 }; 48 49 #define IPFC_HDRLEN 16 50 51 /* Extract src, dst addresses */ 52 static inline void 53 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc, 54 char *ipfcdst) 55 { 56 /* 57 * We assume that, as per RFC 2625, the lower 48 bits of the 58 * source and destination addresses are MAC addresses. 59 */ 60 memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6); 61 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6); 62 } 63 64 /* 65 * Print the Network_Header 66 */ 67 static inline void 68 ipfc_hdr_print(netdissect_options *ndo, 69 register const struct ipfc_header *ipfcp _U_, 70 register u_int length, register const u_char *ipfcsrc, 71 register const u_char *ipfcdst) 72 { 73 const char *srcname, *dstname; 74 75 srcname = etheraddr_string(ndo, ipfcsrc); 76 dstname = etheraddr_string(ndo, ipfcdst); 77 78 /* 79 * XXX - should we show the upper 16 bits of the addresses? 80 * Do so only if "vflag" is set? 81 * Section 3.3 "FC Port and Node Network Addresses" says that 82 * 83 * In this specification, both the Source and Destination 84 * 4-bit NAA identifiers SHALL be set to binary '0001' 85 * indicating that an IEEE 48-bit MAC address is contained 86 * in the lower 48 bits of the network address fields. The 87 * high order 12 bits in the network address fields SHALL 88 * be set to 0x0000. 89 * 90 * so, for captures following this specification, the upper 16 91 * bits should be 0x1000, followed by a MAC address. 92 */ 93 ND_PRINT((ndo, "%s > %s, length %u: ", srcname, dstname, length)); 94 } 95 96 static u_int 97 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 98 { 99 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p; 100 struct ether_header ehdr; 101 struct lladdr_info src, dst; 102 int llc_hdrlen; 103 104 if (caplen < IPFC_HDRLEN) { 105 ND_PRINT((ndo, "[|ipfc]")); 106 return (caplen); 107 } 108 /* 109 * Get the network addresses into a canonical form 110 */ 111 extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 112 113 if (ndo->ndo_eflag) 114 ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr)); 115 116 src.addr = ESRC(&ehdr); 117 src.addr_string = etheraddr_string; 118 dst.addr = EDST(&ehdr); 119 dst.addr_string = etheraddr_string; 120 121 /* Skip over Network_Header */ 122 length -= IPFC_HDRLEN; 123 p += IPFC_HDRLEN; 124 caplen -= IPFC_HDRLEN; 125 126 /* Try to print the LLC-layer header & higher layers */ 127 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 128 if (llc_hdrlen < 0) { 129 /* 130 * Some kinds of LLC packet we cannot 131 * handle intelligently 132 */ 133 if (!ndo->ndo_suppress_default_print) 134 ND_DEFAULTPRINT(p, caplen); 135 llc_hdrlen = -llc_hdrlen; 136 } 137 return (IPFC_HDRLEN + llc_hdrlen); 138 } 139 140 /* 141 * This is the top level routine of the printer. 'p' points 142 * to the Network_Header of the packet, 'h->ts' is the timestamp, 143 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 144 * is the number of bytes actually captured. 145 */ 146 u_int 147 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) 148 { 149 return (ipfc_print(ndo, p, h->len, h->caplen)); 150 } 151