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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
* 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.
*
* Hacked version of print-ether.c Larry Lile <lile@stdio.com>
*
* Further tweaked to more closely resemble print-fddi.c
* Guy Harris <guy@alum.mit.edu>
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <pcap.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "ether.h"
#include "token.h"
/* Extract src, dst addresses */
static inline void
extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
{
memcpy(fdst, (const char *)trp->token_dhost, 6);
memcpy(fsrc, (const char *)trp->token_shost, 6);
}
/*
* Print the TR MAC header
*/
static inline void
token_hdr_print(register const struct token_header *trp, register u_int length,
register const u_char *fsrc, register const u_char *fdst)
{
const char *srcname, *dstname;
srcname = etheraddr_string(fsrc);
dstname = etheraddr_string(fdst);
if (vflag)
(void) printf("%02x %02x %s %s %d: ",
trp->token_ac,
trp->token_fc,
srcname, dstname,
length);
else
printf("%s %s %d: ", srcname, dstname, length);
}
static const char *broadcast_indicator[] = {
"Non-Broadcast", "Non-Broadcast",
"Non-Broadcast", "Non-Broadcast",
"All-routes", "All-routes",
"Single-route", "Single-route"
};
static const char *direction[] = {
"Forward", "Backward"
};
static const char *largest_frame[] = {
"516",
"1500",
"2052",
"4472",
"8144",
"11407",
"17800",
"??"
};
u_int
token_print(const u_char *p, u_int length, u_int caplen)
{
const struct token_header *trp;
u_short extracted_ethertype;
struct ether_header ehdr;
u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
int seg;
trp = (const struct token_header *)p;
if (caplen < TOKEN_HDRLEN) {
printf("[|token-ring]");
return hdr_len;
}
/*
* Get the TR addresses into a canonical form
*/
extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
/* Adjust for source routing information in the MAC header */
if (IS_SOURCE_ROUTED(trp)) {
/* Clear source-routed bit */
*ESRC(&ehdr) &= 0x7f;
if (eflag)
token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
if (caplen < TOKEN_HDRLEN + 2) {
printf("[|token-ring]");
return hdr_len;
}
route_len = RIF_LENGTH(trp);
hdr_len += route_len;
if (caplen < hdr_len) {
printf("[|token-ring]");
return hdr_len;
}
if (vflag) {
printf("%s ", broadcast_indicator[BROADCAST(trp)]);
printf("%s", direction[DIRECTION(trp)]);
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
printf(" [%d:%d]", RING_NUMBER(trp, seg),
BRIDGE_NUMBER(trp, seg));
} else {
printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
}
printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
} else {
if (eflag)
token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
}
/* Skip over token ring MAC header and routing information */
length -= hdr_len;
p += hdr_len;
caplen -= hdr_len;
/* Frame Control field determines interpretation of packet */
if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
&extracted_ethertype) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
token_hdr_print(trp,
length + TOKEN_HDRLEN + route_len,
ESRC(&ehdr), EDST(&ehdr));
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!suppress_default_print)
default_print(p, caplen);
}
} else {
/* Some kinds of TR packet we cannot handle intelligently */
/* XXX - dissect MAC packets if frame type is 0 */
if (!eflag)
token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
ESRC(&ehdr), EDST(&ehdr));
if (!suppress_default_print)
default_print(p, caplen);
}
return (hdr_len);
}
/*
* This is the top level routine of the printer. 'p' points
* to the TR 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
token_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
return (token_print(p, h->len, h->caplen));
}
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