nexmon – Rev 1
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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>
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <string.h>
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "ether.h"
/*
* Copyright (c) 1998, Larry Lile
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define TOKEN_HDRLEN 14
#define TOKEN_RING_MAC_LEN 6
#define ROUTING_SEGMENT_MAX 16
#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
#define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
#define TOKEN_FC_LLC 1
#define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
#define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
#define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
#define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
#define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
#define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
struct token_header {
uint8_t token_ac;
uint8_t token_fc;
uint8_t token_dhost[TOKEN_RING_MAC_LEN];
uint8_t token_shost[TOKEN_RING_MAC_LEN];
uint16_t token_rcf;
uint16_t token_rseg[ROUTING_SEGMENT_MAX];
};
static const char tstr[] = "[|token-ring]";
/* 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(netdissect_options *ndo,
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(ndo, fsrc);
dstname = etheraddr_string(ndo, fdst);
if (ndo->ndo_vflag)
ND_PRINT((ndo, "%02x %02x %s %s %d: ",
trp->token_ac,
trp->token_fc,
srcname, dstname,
length));
else
ND_PRINT((ndo, "%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(netdissect_options *ndo, 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) {
ND_PRINT((ndo, "%s", tstr));
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 (ndo->ndo_eflag)
token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
if (caplen < TOKEN_HDRLEN + 2) {
ND_PRINT((ndo, "%s", tstr));
return hdr_len;
}
route_len = RIF_LENGTH(trp);
hdr_len += route_len;
if (caplen < hdr_len) {
ND_PRINT((ndo, "%s", tstr));
return hdr_len;
}
if (ndo->ndo_vflag) {
ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
BRIDGE_NUMBER(trp, seg)));
} else {
ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
}
ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
} else {
if (ndo->ndo_eflag)
token_hdr_print(ndo, 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(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
&extracted_ethertype) == 0) {
/* ether_type not known, print raw packet */
if (!ndo->ndo_eflag)
token_hdr_print(ndo, trp,
length + TOKEN_HDRLEN + route_len,
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 {
/* Some kinds of TR packet we cannot handle intelligently */
/* XXX - dissect MAC packets if frame type is 0 */
if (!ndo->ndo_eflag)
token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
ESRC(&ehdr), EDST(&ehdr));
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(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(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
return (token_print(ndo, p, h->len, h->caplen));
}