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