nexmon – Rev 1
?pathlinks?
/*
* 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"
/*
* Based on Ultrix if_fddi.h
*/
struct fddi_header {
u_char fddi_fc; /* frame control */
u_char fddi_dhost[6];
u_char fddi_shost[6];
};
/*
* Length of an FDDI header; note that some compilers may pad
* "struct fddi_header" to a multiple of 4 bytes, for example, so
* "sizeof (struct fddi_header)" may not give the right
* answer.
*/
#define FDDI_HDRLEN 13
/* Useful values for fddi_fc (frame control) field */
/*
* FDDI Frame Control bits
*/
#define FDDIFC_C 0x80 /* Class bit */
#define FDDIFC_L 0x40 /* Address length bit */
#define FDDIFC_F 0x30 /* Frame format bits */
#define FDDIFC_Z 0x0f /* Control bits */
/*
* FDDI Frame Control values. (48-bit addressing only).
*/
#define FDDIFC_VOID 0x40 /* Void frame */
#define FDDIFC_NRT 0x80 /* Nonrestricted token */
#define FDDIFC_RT 0xc0 /* Restricted token */
#define FDDIFC_SMT_INFO 0x41 /* SMT Info */
#define FDDIFC_SMT_NSA 0x4F /* SMT Next station adrs */
#define FDDIFC_MAC_BEACON 0xc2 /* MAC Beacon frame */
#define FDDIFC_MAC_CLAIM 0xc3 /* MAC Claim frame */
#define FDDIFC_LLC_ASYNC 0x50 /* Async. LLC frame */
#define FDDIFC_LLC_SYNC 0xd0 /* Sync. LLC frame */
#define FDDIFC_IMP_ASYNC 0x60 /* Implementor Async. */
#define FDDIFC_IMP_SYNC 0xe0 /* Implementor Synch. */
#define FDDIFC_SMT 0x40 /* SMT frame */
#define FDDIFC_MAC 0xc0 /* MAC frame */
#define FDDIFC_CLFF 0xF0 /* Class/Length/Format bits */
#define FDDIFC_ZZZZ 0x0F /* Control bits */
/*
* Some FDDI interfaces use bit-swapped addresses.
*/
#if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__)
int fddi_bitswap = 0;
#else
int fddi_bitswap = 1;
#endif
/*
* FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992
*
* Based in part on code by Van Jacobson, which bears this note:
*
* NOTE: This is a very preliminary hack for FDDI support.
* There are all sorts of wired in constants & nothing (yet)
* to print SMT packets as anything other than hex dumps.
* Most of the necessary changes are waiting on my redoing
* the "header" that a kernel fddi driver supplies to bpf: I
* want it to look like one byte of 'direction' (0 or 1
* depending on whether the packet was inbound or outbound),
* two bytes of system/driver dependent data (anything an
* implementor thinks would be useful to filter on and/or
* save per-packet, then the real 21-byte FDDI header.
* Steve McCanne & I have also talked about adding the
* 'direction' byte to all bpf headers (e.g., in the two
* bytes of padding on an ethernet header). It's not clear
* we could do this in a backwards compatible way & we hate
* the idea of an incompatible bpf change. Discussions are
* proceeding.
*
* Also, to really support FDDI (and better support 802.2
* over ethernet) we really need to re-think the rather simple
* minded assumptions about fixed length & fixed format link
* level headers made in gencode.c. One day...
*
* - vj
*/
static const u_char fddi_bit_swap[] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
/*
* Print FDDI frame-control bits
*/
static inline void
print_fddi_fc(netdissect_options *ndo, u_char fc)
{
switch (fc) {
case FDDIFC_VOID: /* Void frame */
ND_PRINT((ndo, "void "));
break;
case FDDIFC_NRT: /* Nonrestricted token */
ND_PRINT((ndo, "nrt "));
break;
case FDDIFC_RT: /* Restricted token */
ND_PRINT((ndo, "rt "));
break;
case FDDIFC_SMT_INFO: /* SMT Info */
ND_PRINT((ndo, "info "));
break;
case FDDIFC_SMT_NSA: /* SMT Next station adrs */
ND_PRINT((ndo, "nsa "));
break;
case FDDIFC_MAC_BEACON: /* MAC Beacon frame */
ND_PRINT((ndo, "beacon "));
break;
case FDDIFC_MAC_CLAIM: /* MAC Claim frame */
ND_PRINT((ndo, "claim "));
break;
default:
switch (fc & FDDIFC_CLFF) {
case FDDIFC_MAC:
ND_PRINT((ndo, "mac%1x ", fc & FDDIFC_ZZZZ));
break;
case FDDIFC_SMT:
ND_PRINT((ndo, "smt%1x ", fc & FDDIFC_ZZZZ));
break;
case FDDIFC_LLC_ASYNC:
ND_PRINT((ndo, "async%1x ", fc & FDDIFC_ZZZZ));
break;
case FDDIFC_LLC_SYNC:
ND_PRINT((ndo, "sync%1x ", fc & FDDIFC_ZZZZ));
break;
case FDDIFC_IMP_ASYNC:
ND_PRINT((ndo, "imp_async%1x ", fc & FDDIFC_ZZZZ));
break;
case FDDIFC_IMP_SYNC:
ND_PRINT((ndo, "imp_sync%1x ", fc & FDDIFC_ZZZZ));
break;
default:
ND_PRINT((ndo, "%02x ", fc));
break;
}
}
}
/* Extract src, dst addresses */
static inline void
extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst)
{
register int i;
if (fddi_bitswap) {
/*
* bit-swap the fddi addresses (isn't the IEEE standards
* process wonderful!) then convert them to names.
*/
for (i = 0; i < 6; ++i)
fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]];
for (i = 0; i < 6; ++i)
fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]];
}
else {
memcpy(fdst, (const char *)fddip->fddi_dhost, 6);
memcpy(fsrc, (const char *)fddip->fddi_shost, 6);
}
}
/*
* Print the FDDI MAC header
*/
static inline void
fddi_hdr_print(netdissect_options *ndo,
register const struct fddi_header *fddip, register u_int length,
register const u_char *fsrc, register const u_char *fdst)
{
const char *srcname, *dstname;
srcname = etheraddr_string(ndo, fsrc);
dstname = etheraddr_string(ndo, fdst);
if (ndo->ndo_vflag)
ND_PRINT((ndo, "%02x %s %s %d: ",
fddip->fddi_fc,
srcname, dstname,
length));
else if (ndo->ndo_qflag)
ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
else {
print_fddi_fc(ndo, fddip->fddi_fc);
ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
}
}
static inline void
fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_)
{
ND_PRINT((ndo, "<SMT printer not yet implemented>"));
}
void
fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
{
const struct fddi_header *fddip = (const struct fddi_header *)p;
struct ether_header ehdr;
u_short extracted_ethertype;
if (caplen < FDDI_HDRLEN) {
ND_PRINT((ndo, "[|fddi]"));
return;
}
/*
* Get the FDDI addresses into a canonical form
*/
extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
if (ndo->ndo_eflag)
fddi_hdr_print(ndo, fddip, length, ESRC(&ehdr), EDST(&ehdr));
/* Skip over FDDI MAC header */
length -= FDDI_HDRLEN;
p += FDDI_HDRLEN;
caplen -= FDDI_HDRLEN;
/* Frame Control field determines interpretation of packet */
if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
/* 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)
fddi_hdr_print(ndo, fddip, length + FDDI_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);
}
} else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
fddi_smt_print(ndo, p, caplen);
else {
/* Some kinds of FDDI packet we cannot handle intelligently */
if (!ndo->ndo_eflag)
fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN, ESRC(&ehdr),
EDST(&ehdr));
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
}
}
/*
* This is the top level routine of the printer. 'p' points
* to the FDDI 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
fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
{
fddi_print(ndo, p, h->len, h->caplen);
return (FDDI_HDRLEN);
}