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