/*
* 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 <[email protected]>
*
* Further tweaked to more closely resemble print-fddi.c
*      Guy Harris <[email protected]>
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-token.c,v 1.8 2024/09/02 16:15:33 christos Exp $");
#endif

/* \summary: Token Ring printer */

#include <config.h>

#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);
}

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