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 1.8 2024/09/02 16:15:31 christos Exp $"); 25 #endif 26 27 /* \summary: IP over Fibre Channel printer */ 28 29 /* specification: RFC 2625 */ 30 31 #include <config.h> 32 33 #include "netdissect-stdinc.h" 34 35 #include <string.h> 36 37 #define ND_LONGJMP_FROM_TCHECK 38 #include "netdissect.h" 39 #include "addrtoname.h" 40 41 42 struct ipfc_header { 43 nd_byte ipfc_dhost[2+MAC_ADDR_LEN]; 44 nd_byte ipfc_shost[2+MAC_ADDR_LEN]; 45 }; 46 47 #define IPFC_HDRLEN 16 48 49 /* Extract src, dst addresses */ 50 static void 51 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc, 52 char *ipfcdst) 53 { 54 /* 55 * We assume that, as per RFC 2625, the lower 48 bits of the 56 * source and destination addresses are MAC addresses. 57 */ 58 memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], MAC_ADDR_LEN); 59 memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], MAC_ADDR_LEN); 60 } 61 62 /* 63 * Print the Network_Header 64 */ 65 static void 66 ipfc_hdr_print(netdissect_options *ndo, 67 const struct ipfc_header *ipfcp _U_, u_int length, 68 const u_char *ipfcsrc, const u_char *ipfcdst) 69 { 70 const char *srcname, *dstname; 71 72 srcname = etheraddr_string(ndo, ipfcsrc); 73 dstname = etheraddr_string(ndo, ipfcdst); 74 75 /* 76 * XXX - should we show the upper 16 bits of the addresses? 77 * Do so only if "vflag" is set? 78 * Section 3.3 "FC Port and Node Network Addresses" says that 79 * 80 * In this specification, both the Source and Destination 81 * 4-bit NAA identifiers SHALL be set to binary '0001' 82 * indicating that an IEEE 48-bit MAC address is contained 83 * in the lower 48 bits of the network address fields. The 84 * high order 12 bits in the network address fields SHALL 85 * be set to 0x0000. 86 * 87 * so, for captures following this specification, the upper 16 88 * bits should be 0x1000, followed by a MAC address. 89 */ 90 ND_PRINT("%s > %s, length %u: ", srcname, dstname, length); 91 } 92 93 static u_int 94 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 95 { 96 const struct ipfc_header *ipfcp = (const struct ipfc_header *)p; 97 nd_mac_addr srcmac, dstmac; 98 struct lladdr_info src, dst; 99 int llc_hdrlen; 100 101 ndo->ndo_protocol = "ipfc"; 102 ND_TCHECK_LEN(p, IPFC_HDRLEN); 103 /* 104 * Get the network addresses into a canonical form 105 */ 106 extract_ipfc_addrs(ipfcp, (char *)srcmac, (char *)dstmac); 107 108 if (ndo->ndo_eflag) 109 ipfc_hdr_print(ndo, ipfcp, length, srcmac, dstmac); 110 111 src.addr = srcmac; 112 src.addr_string = etheraddr_string; 113 dst.addr = dstmac; 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 void 142 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 143 { 144 ndo->ndo_protocol = "ipfc"; 145 ndo->ndo_ll_hdr_len += ipfc_print(ndo, p, h->len, h->caplen); 146 } 147