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 1.7 2023/08/17 20:19:40 christos 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 #define ND_LONGJMP_FROM_TCHECK 40 #include "netdissect.h" 41 #include "addrtoname.h" 42 43 44 struct ipfc_header { 45 nd_byte ipfc_dhost[2+MAC_ADDR_LEN]; 46 nd_byte ipfc_shost[2+MAC_ADDR_LEN]; 47 }; 48 49 #define IPFC_HDRLEN 16 50 51 /* Extract src, dst addresses */ 52 static 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], MAC_ADDR_LEN); 61 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], MAC_ADDR_LEN); 62 } 63 64 /* 65 * Print the Network_Header 66 */ 67 static void 68 ipfc_hdr_print(netdissect_options *ndo, 69 const struct ipfc_header *ipfcp _U_, u_int length, 70 const u_char *ipfcsrc, const u_char *ipfcdst) 71 { 72 const char *srcname, *dstname; 73 74 srcname = etheraddr_string(ndo, ipfcsrc); 75 dstname = etheraddr_string(ndo, ipfcdst); 76 77 /* 78 * XXX - should we show the upper 16 bits of the addresses? 79 * Do so only if "vflag" is set? 80 * Section 3.3 "FC Port and Node Network Addresses" says that 81 * 82 * In this specification, both the Source and Destination 83 * 4-bit NAA identifiers SHALL be set to binary '0001' 84 * indicating that an IEEE 48-bit MAC address is contained 85 * in the lower 48 bits of the network address fields. The 86 * high order 12 bits in the network address fields SHALL 87 * be set to 0x0000. 88 * 89 * so, for captures following this specification, the upper 16 90 * bits should be 0x1000, followed by a MAC address. 91 */ 92 ND_PRINT("%s > %s, length %u: ", srcname, dstname, length); 93 } 94 95 static u_int 96 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 97 { 98 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p; 99 nd_mac_addr srcmac, dstmac; 100 struct lladdr_info src, dst; 101 int llc_hdrlen; 102 103 ndo->ndo_protocol = "ipfc"; 104 ND_TCHECK_LEN(p, IPFC_HDRLEN); 105 /* 106 * Get the network addresses into a canonical form 107 */ 108 extract_ipfc_addrs(ipfcp, (char *)srcmac, (char *)dstmac); 109 110 if (ndo->ndo_eflag) 111 ipfc_hdr_print(ndo, ipfcp, length, srcmac, dstmac); 112 113 src.addr = srcmac; 114 src.addr_string = etheraddr_string; 115 dst.addr = dstmac; 116 dst.addr_string = etheraddr_string; 117 118 /* Skip over Network_Header */ 119 length -= IPFC_HDRLEN; 120 p += IPFC_HDRLEN; 121 caplen -= IPFC_HDRLEN; 122 123 /* Try to print the LLC-layer header & higher layers */ 124 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 125 if (llc_hdrlen < 0) { 126 /* 127 * Some kinds of LLC packet we cannot 128 * handle intelligently 129 */ 130 if (!ndo->ndo_suppress_default_print) 131 ND_DEFAULTPRINT(p, caplen); 132 llc_hdrlen = -llc_hdrlen; 133 } 134 return (IPFC_HDRLEN + llc_hdrlen); 135 } 136 137 /* 138 * This is the top level routine of the printer. 'p' points 139 * to the Network_Header of the packet, 'h->ts' is the timestamp, 140 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 141 * is the number of bytes actually captured. 142 */ 143 void 144 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 145 { 146 ndo->ndo_protocol = "ipfc"; 147 ndo->ndo_ll_hdr_len += ipfc_print(ndo, p, h->len, h->caplen); 148 } 149