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      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 #define NETDISSECT_REWORKED
     23 #ifdef HAVE_CONFIG_H
     24 #include "config.h"
     25 #endif
     26 
     27 #include <tcpdump-stdinc.h>
     28 
     29 #include <string.h>
     30 
     31 #include "interface.h"
     32 #include "addrtoname.h"
     33 
     34 #include "ether.h"
     35 
     36 /*
     37  * RFC 2625 IP-over-Fibre Channel.
     38  */
     39 
     40 struct ipfc_header {
     41 	u_char  ipfc_dhost[8];
     42 	u_char  ipfc_shost[8];
     43 };
     44 
     45 #define IPFC_HDRLEN 16
     46 
     47 /* Extract src, dst addresses */
     48 static inline void
     49 extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
     50     char *ipfcdst)
     51 {
     52 	/*
     53 	 * We assume that, as per RFC 2625, the lower 48 bits of the
     54 	 * source and destination addresses are MAC addresses.
     55 	 */
     56 	memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
     57 	memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
     58 }
     59 
     60 /*
     61  * Print the Network_Header
     62  */
     63 static inline void
     64 ipfc_hdr_print(netdissect_options *ndo,
     65 	   register const struct ipfc_header *ipfcp _U_,
     66 	   register u_int length, register const u_char *ipfcsrc,
     67 	   register const u_char *ipfcdst)
     68 {
     69 	const char *srcname, *dstname;
     70 
     71 	srcname = etheraddr_string(ndo, ipfcsrc);
     72 	dstname = etheraddr_string(ndo, ipfcdst);
     73 
     74 	/*
     75 	 * XXX - show the upper 16 bits?  Do so only if "vflag" is set?
     76 	 */
     77 	ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
     78 }
     79 
     80 static void
     81 ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
     82 {
     83 	const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
     84 	struct ether_header ehdr;
     85 	u_short extracted_ethertype;
     86 
     87 	if (caplen < IPFC_HDRLEN) {
     88 		ND_PRINT((ndo, "[|ipfc]"));
     89 		return;
     90 	}
     91 	/*
     92 	 * Get the network addresses into a canonical form
     93 	 */
     94 	extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
     95 
     96 	if (ndo->ndo_eflag)
     97 		ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
     98 
     99 	/* Skip over Network_Header */
    100 	length -= IPFC_HDRLEN;
    101 	p += IPFC_HDRLEN;
    102 	caplen -= IPFC_HDRLEN;
    103 
    104 	/* Try to print the LLC-layer header & higher layers */
    105 	if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
    106 	    &extracted_ethertype) == 0) {
    107 		/*
    108 		 * Some kinds of LLC packet we cannot
    109 		 * handle intelligently
    110 		 */
    111 		if (!ndo->ndo_eflag)
    112 			ipfc_hdr_print(ndo, ipfcp, length + IPFC_HDRLEN,
    113 			    ESRC(&ehdr), EDST(&ehdr));
    114 		if (extracted_ethertype) {
    115 			ND_PRINT((ndo, "(LLC %s) ",
    116 		etherproto_string(htons(extracted_ethertype))));
    117 		}
    118 		if (!ndo->ndo_suppress_default_print)
    119 			ND_DEFAULTPRINT(p, caplen);
    120 	}
    121 }
    122 
    123 /*
    124  * This is the top level routine of the printer.  'p' points
    125  * to the Network_Header of the packet, 'h->ts' is the timestamp,
    126  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    127  * is the number of bytes actually captured.
    128  */
    129 u_int
    130 ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
    131 {
    132 	ipfc_print(ndo, p, h->len, h->caplen);
    133 
    134 	return (IPFC_HDRLEN);
    135 }
    136