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251 lines
8.0 KiB
251 lines
8.0 KiB
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Hacked version of print-ether.c Larry Lile <lile@stdio.com>
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*
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* Further tweaked to more closely resemble print-fddi.c
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* Guy Harris <guy@alum.mit.edu>
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*/
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/* \summary: Token Ring printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include <string.h>
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#include "netdissect.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ether.h"
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/*
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* Copyright (c) 1998, Larry Lile
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#define TOKEN_HDRLEN 14
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#define TOKEN_RING_MAC_LEN 6
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#define ROUTING_SEGMENT_MAX 16
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#define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80)
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#define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6)
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#define TOKEN_FC_LLC 1
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#define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
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#define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
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#define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
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#define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
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#define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
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#define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
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#define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2))
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struct token_header {
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uint8_t token_ac;
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uint8_t token_fc;
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uint8_t token_dhost[TOKEN_RING_MAC_LEN];
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uint8_t token_shost[TOKEN_RING_MAC_LEN];
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uint16_t token_rcf;
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uint16_t token_rseg[ROUTING_SEGMENT_MAX];
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};
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static const char tstr[] = "[|token-ring]";
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/* Extract src, dst addresses */
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static inline void
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extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
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{
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memcpy(fdst, (const char *)trp->token_dhost, 6);
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memcpy(fsrc, (const char *)trp->token_shost, 6);
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}
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/*
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* Print the TR MAC header
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*/
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static inline void
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token_hdr_print(netdissect_options *ndo,
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register const struct token_header *trp, register u_int length,
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register const u_char *fsrc, register const u_char *fdst)
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{
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const char *srcname, *dstname;
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srcname = etheraddr_string(ndo, fsrc);
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dstname = etheraddr_string(ndo, fdst);
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if (!ndo->ndo_qflag)
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ND_PRINT((ndo, "%02x %02x ",
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trp->token_ac,
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trp->token_fc));
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ND_PRINT((ndo, "%s > %s, length %u: ",
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srcname, dstname,
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length));
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}
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static const char *broadcast_indicator[] = {
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"Non-Broadcast", "Non-Broadcast",
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"Non-Broadcast", "Non-Broadcast",
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"All-routes", "All-routes",
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"Single-route", "Single-route"
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};
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static const char *direction[] = {
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"Forward", "Backward"
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};
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static const char *largest_frame[] = {
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"516",
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"1500",
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"2052",
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"4472",
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"8144",
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"11407",
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"17800",
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"??"
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};
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u_int
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token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
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{
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const struct token_header *trp;
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int llc_hdrlen;
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struct ether_header ehdr;
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struct lladdr_info src, dst;
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u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
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int seg;
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trp = (const struct token_header *)p;
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if (caplen < TOKEN_HDRLEN) {
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ND_PRINT((ndo, "%s", tstr));
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return hdr_len;
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}
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/*
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* Get the TR addresses into a canonical form
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*/
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extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
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/* Adjust for source routing information in the MAC header */
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if (IS_SOURCE_ROUTED(trp)) {
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/* Clear source-routed bit */
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*ESRC(&ehdr) &= 0x7f;
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if (ndo->ndo_eflag)
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token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
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if (caplen < TOKEN_HDRLEN + 2) {
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ND_PRINT((ndo, "%s", tstr));
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return hdr_len;
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}
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route_len = RIF_LENGTH(trp);
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hdr_len += route_len;
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if (caplen < hdr_len) {
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ND_PRINT((ndo, "%s", tstr));
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return hdr_len;
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}
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if (ndo->ndo_vflag) {
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ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
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ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
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for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
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ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
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BRIDGE_NUMBER(trp, seg)));
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} else {
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ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
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for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
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ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
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}
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ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
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} else {
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if (ndo->ndo_eflag)
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token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
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}
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src.addr = ESRC(&ehdr);
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src.addr_string = etheraddr_string;
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dst.addr = EDST(&ehdr);
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dst.addr_string = etheraddr_string;
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/* Skip over token ring MAC header and routing information */
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length -= hdr_len;
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p += hdr_len;
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caplen -= hdr_len;
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/* Frame Control field determines interpretation of packet */
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if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
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/* Try to print the LLC-layer header & higher layers */
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llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
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if (llc_hdrlen < 0) {
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/* packet type not known, print raw packet */
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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llc_hdrlen = -llc_hdrlen;
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}
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hdr_len += llc_hdrlen;
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} else {
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/* Some kinds of TR packet we cannot handle intelligently */
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/* XXX - dissect MAC packets if frame type is 0 */
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if (!ndo->ndo_eflag)
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token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
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ESRC(&ehdr), EDST(&ehdr));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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}
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return (hdr_len);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the TR header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
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{
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return (token_print(ndo, p, h->len, h->caplen));
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}
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