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 <pcap.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36
  37 #include "interface.h"
  38 #include "extract.h"
  39 #include "addrtoname.h"
  40 #include "ethertype.h"
  41
  42 #include "ether.h"
  43
  44 /*
  45  * Copyright (c) 1998, Larry Lile
  46  * All rights reserved.
  47  *
  48  * Redistribution and use in source and binary forms, with or without
  49  * modification, are permitted provided that the following conditions
  50  * are met:
  51  * 1. Redistributions of source code must retain the above copyright
  52  *    notice unmodified, this list of conditions, and the following
  53  *    disclaimer.
  54  * 2. Redistributions in binary form must reproduce the above copyright
  55  *    notice, this list of conditions and the following disclaimer in the
  56  *    documentation and/or other materials provided with the distribution.
  57  *
  58  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  68  * SUCH DAMAGE.
  69  *
  70  */
  71
  72 #define TOKEN_HDRLEN            14
  73 #define TOKEN_RING_MAC_LEN      6
  74 #define ROUTING_SEGMENT_MAX     16
  75 #define IS_SOURCE_ROUTED(trp)   ((trp)->token_shost[0] & 0x80)
  76 #define FRAME_TYPE(trp)         (((trp)->token_fc & 0xC0) >> 6)
  77 #define TOKEN_FC_LLC            1
  78
  79 #define BROADCAST(trp)          ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13)
  80 #define RIF_LENGTH(trp)         ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8)
  81 #define DIRECTION(trp)          ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7)
  82 #define LARGEST_FRAME(trp)      ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4)
  83 #define RING_NUMBER(trp, x)     ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4)
  84 #define BRIDGE_NUMBER(trp, x)   ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f))
  85 #define SEGMENT_COUNT(trp)      ((int)((RIF_LENGTH(trp) - 2) / 2))
  86
  87 struct token_header {
  88         u_int8_t  token_ac;
  89         u_int8_t  token_fc;
  90         u_int8_t  token_dhost[TOKEN_RING_MAC_LEN];
  91         u_int8_t  token_shost[TOKEN_RING_MAC_LEN];
  92         u_int16_t token_rcf;
  93         u_int16_t token_rseg[ROUTING_SEGMENT_MAX];
  94 };
  95
  96 static const char tstr[] = "[|token-ring]";
  97
  98 /* Extract src, dst addresses */
  99 static inline void
 100 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
 101 {
 102         memcpy(fdst, (const char *)trp->token_dhost, 6);
 103         memcpy(fsrc, (const char *)trp->token_shost, 6);
 104 }
 105
 106 /*
 107  * Print the TR MAC header
 108  */
 109 static inline void
 110 token_hdr_print(register const struct token_header *trp, register u_int length,
 111            register const u_char *fsrc, register const u_char *fdst)
 112 {
 113         const char *srcname, *dstname;
 114
 115         srcname = etheraddr_string(fsrc);
 116         dstname = etheraddr_string(fdst);
 117
 118         if (vflag)
 119                 (void) printf("%02x %02x %s %s %d: ",
 120                        trp->token_ac,
 121                        trp->token_fc,
 122                        srcname, dstname,
 123                        length);
 124         else
 125                 printf("%s %s %d: ", srcname, dstname, length);
 126 }
 127
 128 static const char *broadcast_indicator[] = {
 129         "Non-Broadcast", "Non-Broadcast",
 130         "Non-Broadcast", "Non-Broadcast",
 131         "All-routes",    "All-routes",
 132         "Single-route",  "Single-route"
 133 };
 134
 135 static const char *direction[] = {
 136         "Forward", "Backward"
 137 };
 138
 139 static const char *largest_frame[] = {
 140         "516",
 141         "1500",
 142         "2052",
 143         "4472",
 144         "8144",
 145         "11407",
 146         "17800",
 147         "??"
 148 };
 149
 150 u_int
 151 token_print(const u_char *p, u_int length, u_int caplen)
 152 {
 153         const struct token_header *trp;
 154         u_short extracted_ethertype;
 155         struct ether_header ehdr;
 156         u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
 157         int seg;
 158
 159         trp = (const struct token_header *)p;
 160
 161         if (caplen < TOKEN_HDRLEN) {
 162                 printf("%s", tstr);
 163                 return hdr_len;
 164         }
 165
 166         /*
 167          * Get the TR addresses into a canonical form
 168          */
 169         extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
 170
 171         /* Adjust for source routing information in the MAC header */
 172         if (IS_SOURCE_ROUTED(trp)) {
 173                 /* Clear source-routed bit */
 174                 *ESRC(&ehdr) &= 0x7f;
 175
 176                 if (eflag)
 177                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 178
 179                 if (caplen < TOKEN_HDRLEN + 2) {
 180                         printf("%s", tstr);
 181                         return hdr_len;
 182                 }
 183                 route_len = RIF_LENGTH(trp);
 184                 hdr_len += route_len;
 185                 if (caplen < hdr_len) {
 186                         printf("%s", tstr);
 187                         return hdr_len;
 188                 }
 189                 if (vflag) {
 190                         printf("%s ", broadcast_indicator[BROADCAST(trp)]);
 191                         printf("%s", direction[DIRECTION(trp)]);
 192
 193                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 194                                 printf(" [%d:%d]", RING_NUMBER(trp, seg),
 195                                     BRIDGE_NUMBER(trp, seg));
 196                 } else {
 197                         printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
 198
 199                         for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
 200                                 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
 201                 }
 202                 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
 203         } else {
 204                 if (eflag)
 205                         token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
 206         }
 207
 208         /* Skip over token ring MAC header and routing information */
 209         length -= hdr_len;
 210         p += hdr_len;
 211         caplen -= hdr_len;
 212
 213         /* Frame Control field determines interpretation of packet */
 214         if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
 215                 /* Try to print the LLC-layer header & higher layers */
 216                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 217                     &extracted_ethertype) == 0) {
 218                         /* ether_type not known, print raw packet */
 219                         if (!eflag)
 220                                 token_hdr_print(trp,
 221                                     length + TOKEN_HDRLEN + route_len,
 222                                     ESRC(&ehdr), EDST(&ehdr));
 223                         if (extracted_ethertype) {
 224                                 printf("(LLC %s) ",
 225                         etherproto_string(htons(extracted_ethertype)));
 226                         }
 227                         if (!suppress_default_print)
 228                                 default_print(p, caplen);
 229                 }
 230         } else {
 231                 /* Some kinds of TR packet we cannot handle intelligently */
 232                 /* XXX - dissect MAC packets if frame type is 0 */
 233                 if (!eflag)
 234                         token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
 235                             ESRC(&ehdr), EDST(&ehdr));
 236                 if (!suppress_default_print)
 237                         default_print(p, caplen);
 238         }
 239         return (hdr_len);
 240 }
 241
 242 /*
 243  * This is the top level routine of the printer.  'p' points
 244  * to the TR header of the packet, 'h->ts' is the timestamp,
 245  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 246  * is the number of bytes actually captured.
 247  */
 248 u_int
 249 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
 250 {
 251         return (token_print(p, h->len, h->caplen));
 252 }