nexmon – Rev 1
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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.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ether.h"
/*
* RFC 2625 IP-over-Fibre Channel.
*/
struct ipfc_header {
u_char ipfc_dhost[8];
u_char ipfc_shost[8];
};
#define IPFC_HDRLEN 16
/* Extract src, dst addresses */
static inline 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], 6);
memcpy(ipfcsrc, (const char *)&ipfcp->ipfc_shost[2], 6);
}
/*
* Print the Network_Header
*/
static inline void
ipfc_hdr_print(netdissect_options *ndo,
register const struct ipfc_header *ipfcp _U_,
register u_int length, register const u_char *ipfcsrc,
register const u_char *ipfcdst)
{
const char *srcname, *dstname;
srcname = etheraddr_string(ndo, ipfcsrc);
dstname = etheraddr_string(ndo, ipfcdst);
/*
* XXX - show the upper 16 bits? Do so only if "vflag" is set?
*/
ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
}
static void
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;
struct ether_header ehdr;
u_short extracted_ethertype;
if (caplen < IPFC_HDRLEN) {
ND_PRINT((ndo, "[|ipfc]"));
return;
}
/*
* Get the network addresses into a canonical form
*/
extract_ipfc_addrs(ipfcp, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
if (ndo->ndo_eflag)
ipfc_hdr_print(ndo, ipfcp, length, ESRC(&ehdr), EDST(&ehdr));
/* Skip over Network_Header */
length -= IPFC_HDRLEN;
p += IPFC_HDRLEN;
caplen -= IPFC_HDRLEN;
/* Try to print the LLC-layer header & higher layers */
if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
&extracted_ethertype) == 0) {
/*
* Some kinds of LLC packet we cannot
* handle intelligently
*/
if (!ndo->ndo_eflag)
ipfc_hdr_print(ndo, ipfcp, length + IPFC_HDRLEN,
ESRC(&ehdr), EDST(&ehdr));
if (extracted_ethertype) {
ND_PRINT((ndo, "(LLC %s) ",
etherproto_string(htons(extracted_ethertype))));
}
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, 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, register const u_char *p)
{
ipfc_print(ndo, p, h->len, h->caplen);
return (IPFC_HDRLEN);
}