The Tcpdump Group git mirrors - tcpdump/blob - print-token.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Hacked version of print-ether.c  Larry Lile <lile@stdio.com>
  22  *
  23  * Further tweaked to more closely resemble print-fddi.c
  24  *      Guy Harris <guy@alum.mit.edu>
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <string.h>
  34
  35 #include "interface.h"
  36 #include "extract.h"
  37 #include "addrtoname.h"
  38 #include "ether.h"
  39
  40 /*
  41  * Copyright (c) 1998, Larry Lile
  42  * All rights reserved.
  43  *
  44  * Redistribution and use in source and binary forms, with or without
  45  * modification, are permitted provided that the following conditions
  46  * are met:
  47  * 1. Redistributions of source code must retain the above copyright
  48  *    notice unmodified, this list of conditions, and the following
  49  *    disclaimer.
  50  * 2. Redistributions in binary form must reproduce the above copyright
  51  *    notice, this list of conditions and the following disclaimer in the
  52  *    documentation and/or other materials provided with the distribution.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  */
  67
  68 #define TOKEN_HDRLEN            14
  69 #define TOKEN_RING_MAC_LEN      6
  70 #define ROUTING_SEGMENT_MAX     16
  71 #define IS_SOURCE_ROUTED(trp)   ((trp)->token_shost[0] & 0x80)
  72 #define FRAME_TYPE(trp)         (((trp)->token_fc & 0xC0) >> 6)
  73 #define TOKEN_FC_LLC            1
  74
  75 #define BROADCAST(trp)          ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
  76 #define RIF_LENGTH(trp)         ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
  77 #define DIRECTION(trp)          ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
  78 #define LARGEST_FRAME(trp)      ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
  79 #define RING_NUMBER(trp, x)     ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
  80 #define BRIDGE_NUMBER(trp, x)   ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
  81 #define SEGMENT_COUNT(trp)      ((int)((RIF_LENGTH(trp) - 2) / 2))
  82
  83 struct token_header {
  84         uint8_t  token_ac;
  85         uint8_t  token_fc;
  86         uint8_t  token_dhost[TOKEN_RING_MAC_LEN];
  87         uint8_t  token_shost[TOKEN_RING_MAC_LEN];
  88         uint16_t token_rcf;
  89         uint16_t token_rseg[ROUTING_SEGMENT_MAX];
  90 };
  91
  92 static const char tstr[] = "[|token-ring]";
  93
  94 /* Extract src, dst addresses */
  95 static inline void
  96 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
  97 {
  98         memcpy(fdst, (const char *)trp->token_dhost, 6);
  99         memcpy(fsrc, (const char *)trp->token_shost, 6);
 100 }
 101
 102 /*
 103  * Print the TR MAC header
 104  */
 105 static inline void
 106 token_hdr_print(netdissect_options *ndo,
 107                 register const struct token_header *trp, register u_int length,
 108                 register const u_char *fsrc, register const u_char *fdst)
 109 {
 110         const char *srcname, *dstname;
 111
 112         srcname = etheraddr_string(ndo, fsrc);
 113         dstname = etheraddr_string(ndo, fdst);
 114
 115         if (ndo->ndo_vflag)
 116                 ND_PRINT((ndo, "%02x %02x %s %s %d: ",
 117                        trp->token_ac,
 118                        trp->token_fc,
 119                        srcname, dstname,
 120                        length));
 121         else
 122                 ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
 123 }
 124
 125 static const char *broadcast_indicator[] = {
 126         "Non-Broadcast", "Non-Broadcast",
 127         "Non-Broadcast", "Non-Broadcast",
 128         "All-routes",    "All-routes",
 129         "Single-route",  "Single-route"
 130 };
 131
 132 static const char *direction[] = {
 133         "Forward", "Backward"
 134 };
 135
 136 static const char *largest_frame[] = {
 137         "516",
 138         "1500",
 139         "2052",
 140         "4472",
 141         "8144",
 142         "11407",
 143         "17800",
 144         "??"
 145 };
 146
 147 u_int
 148 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
 149 {
 150         const struct token_header *trp;
 151         u_short extracted_ethertype;
 152         struct ether_header ehdr;
 153         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 154         int seg;
 155
 156         trp = (const struct token_header *)p;
 157
 158         if (caplen < TOKEN_HDRLEN) {
 159                 ND_PRINT((ndo, "%s", tstr));
 160                 return hdr_len;
 161         }
 162
 163         /*
 164          * Get the TR addresses into a canonical form
 165          */
 166         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 167
 168         /* Adjust for source routing information in the MAC header */
 169         if (IS_SOURCE_ROUTED(trp)) {
 170                 /* Clear source-routed bit */
 171                 *ESRC(&ehdr) &= 0x7f;
 172
 173                 if (ndo->ndo_eflag)
 174                         token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
 175
 176                 if (caplen < TOKEN_HDRLEN + 2) {
 177                         ND_PRINT((ndo, "%s", tstr));
 178                         return hdr_len;
 179                 }
 180                 route_len = RIF_LENGTH(trp);
 181                 hdr_len += route_len;
 182                 if (caplen < hdr_len) {
 183                         ND_PRINT((ndo, "%s", tstr));
 184                         return hdr_len;
 185                 }
 186                 if (ndo->ndo_vflag) {
 187                         ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)]));
 188                         ND_PRINT((ndo, "%s", direction[DIRECTION(trp)]));
 189
 190                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 191                                 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg),
 192                                     BRIDGE_NUMBER(trp, seg)));
 193                 } else {
 194                         ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf)));
 195
 196                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 197                                 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg])));
 198                 }
 199                 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)]));
 200         } else {
 201                 if (ndo->ndo_eflag)
 202                         token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr));
 203         }
 204
 205         /* Skip over token ring MAC header and routing information */
 206         length -= hdr_len;
 207         p += hdr_len;
 208         caplen -= hdr_len;
 209
 210         /* Frame Control field determines interpretation of packet */
 211         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 212                 /* Try to print the LLC-layer header & higher layers */
 213                 if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 214                     &extracted_ethertype) == 0) {
 215                         /* ether_type not known, print raw packet */
 216                         if (!ndo->ndo_eflag)
 217                                 token_hdr_print(ndo, trp,
 218                                     length + TOKEN_HDRLEN + route_len,
 219                                     ESRC(&ehdr), EDST(&ehdr));
 220                         if (extracted_ethertype) {
 221                                 ND_PRINT((ndo, "(LLC %s) ",
 222                         etherproto_string(htons(extracted_ethertype))));
 223                         }
 224                         if (!ndo->ndo_suppress_default_print)
 225                                 ND_DEFAULTPRINT(p, caplen);
 226                 }
 227         } else {
 228                 /* Some kinds of TR packet we cannot handle intelligently */
 229                 /* XXX - dissect MAC packets if frame type is 0 */
 230                 if (!ndo->ndo_eflag)
 231                         token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len,
 232                             ESRC(&ehdr), EDST(&ehdr));
 233                 if (!ndo->ndo_suppress_default_print)
 234                         ND_DEFAULTPRINT(p, caplen);
 235         }
 236         return (hdr_len);
 237 }
 238
 239 /*
 240  * This is the top level routine of the printer.  'p' points
 241  * to the TR header of the packet, 'h->ts' is the timestamp,
 242  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 243  * is the number of bytes actually captured.
 244  */
 245 u_int
 246 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 247 {
 248         return (token_print(ndo, p, h->len, h->caplen));
 249 }