/*
* 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>
*/
/* \summary: Token Ring printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include <string.h>
#include "netdissect.h"
#include "extract.h"
#include "addrtoname.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 ROUTING_SEGMENT_MAX 16
#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
#define FRAME_TYPE(trp) ((GET_U_1((trp)->token_fc) & 0xC0) >> 6)
#define TOKEN_FC_LLC 1
#define BROADCAST(trp) ((GET_BE_U_2((trp)->token_rcf) & 0xE000) >> 13)
#define RIF_LENGTH(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x1f00) >> 8)
#define DIRECTION(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0080) >> 7)
#define LARGEST_FRAME(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0070) >> 4)
#define RING_NUMBER(trp, x) ((GET_BE_U_2((trp)->token_rseg[x]) & 0xfff0) >> 4)
#define BRIDGE_NUMBER(trp, x) (GET_BE_U_2((trp)->token_rseg[x]) & 0x000f)
#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
struct token_header {
nd_uint8_t token_ac;
nd_uint8_t token_fc;
nd_mac_addr token_dhost;
nd_mac_addr token_shost;
nd_uint16_t token_rcf;
nd_uint16_t token_rseg[ROUTING_SEGMENT_MAX];
};
/* Extract src, dst addresses */
static 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 void
token_hdr_print(netdissect_options *ndo,
const struct token_header *trp, u_int length,
const u_char *fsrc, const u_char *fdst)
{
const char *srcname, *dstname;
srcname = etheraddr_string(ndo, fsrc);
dstname = etheraddr_string(ndo, fdst);
if (!ndo->ndo_qflag)
ND_PRINT("%02x %02x ",
GET_U_1(trp->token_ac),
GET_U_1(trp->token_fc));
ND_PRINT("%s > %s, length %u: ",
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;
int llc_hdrlen;
nd_mac_addr srcmac, dstmac;
struct lladdr_info src, dst;
u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
int seg;
ndo->ndo_protocol = "token-ring";
trp = (const struct token_header *)p;
if (caplen < TOKEN_HDRLEN) {
nd_print_trunc(ndo);
return hdr_len;
}
/*
* Get the TR addresses into a canonical form
*/
extract_token_addrs(trp, (char*)srcmac, (char*)dstmac);
/* Adjust for source routing information in the MAC header */
if (IS_SOURCE_ROUTED(trp)) {
/* Clear source-routed bit */
srcmac[0] &= 0x7f;
if (ndo->ndo_eflag)
token_hdr_print(ndo, trp, length, srcmac, dstmac);
if (caplen < TOKEN_HDRLEN + 2) {
nd_print_trunc(ndo);
return hdr_len;
}
route_len = RIF_LENGTH(trp);
hdr_len += route_len;
if (caplen < hdr_len) {
nd_print_trunc(ndo);
return hdr_len;
}
if (ndo->ndo_vflag) {
ND_PRINT("%s ", broadcast_indicator[BROADCAST(trp)]);
ND_PRINT("%s", direction[DIRECTION(trp)]);
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
ND_PRINT(" [%u:%u]", RING_NUMBER(trp, seg),
BRIDGE_NUMBER(trp, seg));
} else {
ND_PRINT("rt = %x", GET_BE_U_2(trp->token_rcf));
for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
ND_PRINT(":%x",
GET_BE_U_2(trp->token_rseg[seg]));
}
ND_PRINT(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
} else {
if (ndo->ndo_eflag)
token_hdr_print(ndo, trp, length, srcmac, dstmac);
}
src.addr = srcmac;
src.addr_string = etheraddr_string;
dst.addr = dstmac;
dst.addr_string = etheraddr_string;
/* 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 */
llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
if (llc_hdrlen < 0) {
/* packet type not known, print raw packet */
if (!ndo->ndo_suppress_default_print)
ND_DEFAULTPRINT(p, caplen);
llc_hdrlen = -llc_hdrlen;
}
hdr_len += llc_hdrlen;
} 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,
srcmac, dstmac);
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.
*/
void
token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
ndo->ndo_protocol = "token-ring";
ndo->ndo_ll_hdr_len += token_print(ndo, p, h->len, h->caplen);
}