146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/*
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* Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: IP over Fibre Channel printer */
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/* specification: RFC 2625 */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "ether.h"
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struct ipfc_header {
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u_char ipfc_dhost[8];
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u_char ipfc_shost[8];
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};
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#define IPFC_HDRLEN 16
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/* Extract src, dst addresses */
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static inline void
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extract_ipfc_addrs(const struct ipfc_header *ipfcp, char *ipfcsrc,
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char *ipfcdst)
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{
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/*
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* We assume that, as per RFC 2625, the lower 48 bits of the
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* source and destination addresses are MAC addresses.
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*/
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memcpy(ipfcdst, (const char *)&ipfcp->ipfc_dhost[2], 6);
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memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
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}
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/*
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* Print the Network_Header
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*/
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static inline void
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ipfc_hdr_print(netdissect_options *ndo,
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register const struct ipfc_header *ipfcp _U_,
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register u_int length, register const u_char *ipfcsrc,
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register const u_char *ipfcdst)
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{
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const char *srcname, *dstname;
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srcname = etheraddr_string(ndo, ipfcsrc);
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dstname = etheraddr_string(ndo, ipfcdst);
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/*
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* XXX - should we show the upper 16 bits of the addresses?
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* Do so only if "vflag" is set?
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* Section 3.3 "FC Port and Node Network Addresses" says that
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*
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* In this specification, both the Source and Destination
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* 4-bit NAA identifiers SHALL be set to binary '0001'
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* indicating that an IEEE 48-bit MAC address is contained
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* in the lower 48 bits of the network address fields. The
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* high order 12 bits in the network address fields SHALL
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* be set to 0x0000.
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*
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* so, for captures following this specification, the upper 16
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* bits should be 0x1000, followed by a MAC address.
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*/
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ND_PRINT((ndo, "%s > %s, length %u: ", srcname, dstname, length));
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}
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static u_int
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ipfc_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
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{
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const struct ipfc_header *ipfcp = (const struct ipfc_header *)p;
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struct ether_header ehdr;
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struct lladdr_info src, dst;
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int llc_hdrlen;
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if (caplen < IPFC_HDRLEN) {
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ND_PRINT((ndo, "[|ipfc]"));
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return (caplen);
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}
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/*
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* Get the network addresses into a canonical form
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*/
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extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
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if (ndo->ndo_eflag)
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ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
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src.addr = ESRC(&ehdr);
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src.addr_string = etheraddr_string;
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dst.addr = EDST(&ehdr);
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dst.addr_string = etheraddr_string;
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/* Skip over Network_Header */
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length -= IPFC_HDRLEN;
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p += IPFC_HDRLEN;
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caplen -= IPFC_HDRLEN;
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/* Try to print the LLC-layer header & higher layers */
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llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
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if (llc_hdrlen < 0) {
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/*
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* Some kinds of LLC packet we cannot
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* handle intelligently
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*/
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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llc_hdrlen = -llc_hdrlen;
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}
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return (IPFC_HDRLEN + llc_hdrlen);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the Network_Header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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ipfc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
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{
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return (ipfc_print(ndo, p, h->len, h->caplen));
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}
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