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