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

   1 /*
   2  * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997
   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
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <tcpdump-stdinc.h>
  27
  28 #include <pcap.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31
  32 #include "interface.h"
  33 #include "addrtoname.h"
  34 #include "ethertype.h"
  35
  36 #include "ether.h"
  37
  38 /*
  39  * Based on Ultrix if_fddi.h
  40  */
  41
  42 struct fddi_header {
  43         u_char  fddi_fc;                /* frame control */
  44         u_char  fddi_dhost[6];
  45         u_char  fddi_shost[6];
  46 };
  47
  48 /*
  49  * Length of an FDDI header; note that some compilers may pad
  50  * "struct fddi_header" to a multiple of 4 bytes, for example, so
  51  * "sizeof (struct fddi_header)" may not give the right
  52  * answer.
  53  */
  54 #define FDDI_HDRLEN 13
  55
  56 /* Useful values for fddi_fc (frame control) field */
  57
  58 /*
  59  * FDDI Frame Control bits
  60  */
  61 #define FDDIFC_C                0x80            /* Class bit */
  62 #define FDDIFC_L                0x40            /* Address length bit */
  63 #define FDDIFC_F                0x30            /* Frame format bits */
  64 #define FDDIFC_Z                0x0f            /* Control bits */
  65
  66 /*
  67  * FDDI Frame Control values. (48-bit addressing only).
  68  */
  69 #define FDDIFC_VOID             0x40            /* Void frame */
  70 #define FDDIFC_NRT              0x80            /* Nonrestricted token */
  71 #define FDDIFC_RT               0xc0            /* Restricted token */
  72 #define FDDIFC_SMT_INFO         0x41            /* SMT Info */
  73 #define FDDIFC_SMT_NSA          0x4F            /* SMT Next station adrs */
  74 #define FDDIFC_MAC_BEACON       0xc2            /* MAC Beacon frame */
  75 #define FDDIFC_MAC_CLAIM        0xc3            /* MAC Claim frame */
  76 #define FDDIFC_LLC_ASYNC        0x50            /* Async. LLC frame */
  77 #define FDDIFC_LLC_SYNC         0xd0            /* Sync. LLC frame */
  78 #define FDDIFC_IMP_ASYNC        0x60            /* Implementor Async. */
  79 #define FDDIFC_IMP_SYNC         0xe0            /* Implementor Synch. */
  80 #define FDDIFC_SMT              0x40            /* SMT frame */
  81 #define FDDIFC_MAC              0xc0            /* MAC frame */
  82
  83 #define FDDIFC_CLFF             0xF0            /* Class/Length/Format bits */
  84 #define FDDIFC_ZZZZ             0x0F            /* Control bits */
  85
  86 /*
  87  * Some FDDI interfaces use bit-swapped addresses.
  88  */
  89 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__)
  90 int     fddi_bitswap = 0;
  91 #else
  92 int     fddi_bitswap = 1;
  93 #endif
  94
  95 /*
  96  * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992
  97  *
  98  * Based in part on code by Van Jacobson, which bears this note:
  99  *
 100  * NOTE:  This is a very preliminary hack for FDDI support.
 101  * There are all sorts of wired in constants & nothing (yet)
 102  * to print SMT packets as anything other than hex dumps.
 103  * Most of the necessary changes are waiting on my redoing
 104  * the "header" that a kernel fddi driver supplies to bpf:  I
 105  * want it to look like one byte of 'direction' (0 or 1
 106  * depending on whether the packet was inbound or outbound),
 107  * two bytes of system/driver dependent data (anything an
 108  * implementor thinks would be useful to filter on and/or
 109  * save per-packet, then the real 21-byte FDDI header.
 110  * Steve McCanne & I have also talked about adding the
 111  * 'direction' byte to all bpf headers (e.g., in the two
 112  * bytes of padding on an ethernet header).  It's not clear
 113  * we could do this in a backwards compatible way & we hate
 114  * the idea of an incompatible bpf change.  Discussions are
 115  * proceeding.
 116  *
 117  * Also, to really support FDDI (and better support 802.2
 118  * over ethernet) we really need to re-think the rather simple
 119  * minded assumptions about fixed length & fixed format link
 120  * level headers made in gencode.c.  One day...
 121  *
 122  *  - vj
 123  */
 124
 125 static const u_char fddi_bit_swap[] = {
 126         0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
 127         0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
 128         0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
 129         0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
 130         0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
 131         0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
 132         0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
 133         0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
 134         0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
 135         0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
 136         0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
 137         0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
 138         0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
 139         0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
 140         0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
 141         0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
 142         0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
 143         0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
 144         0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
 145         0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
 146         0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
 147         0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
 148         0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
 149         0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
 150         0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
 151         0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
 152         0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
 153         0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
 154         0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
 155         0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
 156         0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
 157         0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
 158 };
 159
 160 /*
 161  * Print FDDI frame-control bits
 162  */
 163 static inline void
 164 print_fddi_fc(u_char fc)
 165 {
 166         switch (fc) {
 167
 168         case FDDIFC_VOID:                         /* Void frame */
 169                 printf("void ");
 170                 break;
 171
 172         case FDDIFC_NRT:                          /* Nonrestricted token */
 173                 printf("nrt ");
 174                 break;
 175
 176         case FDDIFC_RT:                           /* Restricted token */
 177                 printf("rt ");
 178                 break;
 179
 180         case FDDIFC_SMT_INFO:                     /* SMT Info */
 181                 printf("info ");
 182                 break;
 183
 184         case FDDIFC_SMT_NSA:                      /* SMT Next station adrs */
 185                 printf("nsa ");
 186                 break;
 187
 188         case FDDIFC_MAC_BEACON:                   /* MAC Beacon frame */
 189                 printf("beacon ");
 190                 break;
 191
 192         case FDDIFC_MAC_CLAIM:                    /* MAC Claim frame */
 193                 printf("claim ");
 194                 break;
 195
 196         default:
 197                 switch (fc & FDDIFC_CLFF) {
 198
 199                 case FDDIFC_MAC:
 200                         printf("mac%1x ", fc & FDDIFC_ZZZZ);
 201                         break;
 202
 203                 case FDDIFC_SMT:
 204                         printf("smt%1x ", fc & FDDIFC_ZZZZ);
 205                         break;
 206
 207                 case FDDIFC_LLC_ASYNC:
 208                         printf("async%1x ", fc & FDDIFC_ZZZZ);
 209                         break;
 210
 211                 case FDDIFC_LLC_SYNC:
 212                         printf("sync%1x ", fc & FDDIFC_ZZZZ);
 213                         break;
 214
 215                 case FDDIFC_IMP_ASYNC:
 216                         printf("imp_async%1x ", fc & FDDIFC_ZZZZ);
 217                         break;
 218
 219                 case FDDIFC_IMP_SYNC:
 220                         printf("imp_sync%1x ", fc & FDDIFC_ZZZZ);
 221                         break;
 222
 223                 default:
 224                         printf("%02x ", fc);
 225                         break;
 226                 }
 227         }
 228 }
 229
 230 /* Extract src, dst addresses */
 231 static inline void
 232 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst)
 233 {
 234         register int i;
 235
 236         if (fddi_bitswap) {
 237                 /*
 238                  * bit-swap the fddi addresses (isn't the IEEE standards
 239                  * process wonderful!) then convert them to names.
 240                  */
 241                 for (i = 0; i < 6; ++i)
 242                         fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]];
 243                 for (i = 0; i < 6; ++i)
 244                         fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]];
 245         }
 246         else {
 247                 memcpy(fdst, (const char *)fddip->fddi_dhost, 6);
 248                 memcpy(fsrc, (const char *)fddip->fddi_shost, 6);
 249         }
 250 }
 251
 252 /*
 253  * Print the FDDI MAC header
 254  */
 255 static inline void
 256 fddi_hdr_print(register const struct fddi_header *fddip, register u_int length,
 257            register const u_char *fsrc, register const u_char *fdst)
 258 {
 259         const char *srcname, *dstname;
 260
 261         srcname = etheraddr_string(fsrc);
 262         dstname = etheraddr_string(fdst);
 263
 264         if (vflag)
 265                 (void) printf("%02x %s %s %d: ",
 266                        fddip->fddi_fc,
 267                        srcname, dstname,
 268                        length);
 269         else if (qflag)
 270                 printf("%s %s %d: ", srcname, dstname, length);
 271         else {
 272                 (void) print_fddi_fc(fddip->fddi_fc);
 273                 (void) printf("%s %s %d: ", srcname, dstname, length);
 274         }
 275 }
 276
 277 static inline void
 278 fddi_smt_print(const u_char *p _U_, u_int length _U_)
 279 {
 280         printf("<SMT printer not yet implemented>");
 281 }
 282
 283 void
 284 fddi_print(const u_char *p, u_int length, u_int caplen)
 285 {
 286         const struct fddi_header *fddip = (const struct fddi_header *)p;
 287         struct ether_header ehdr;
 288         u_short extracted_ethertype;
 289
 290         if (caplen < FDDI_HDRLEN) {
 291                 printf("[|fddi]");
 292                 return;
 293         }
 294
 295         /*
 296          * Get the FDDI addresses into a canonical form
 297          */
 298         extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
 299
 300         if (eflag)
 301                 fddi_hdr_print(fddip, length, ESRC(&ehdr), EDST(&ehdr));
 302
 303         /* Skip over FDDI MAC header */
 304         length -= FDDI_HDRLEN;
 305         p += FDDI_HDRLEN;
 306         caplen -= FDDI_HDRLEN;
 307
 308         /* Frame Control field determines interpretation of packet */
 309         if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
 310                 /* Try to print the LLC-layer header & higher layers */
 311                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
 312                     &extracted_ethertype) == 0) {
 313                         /*
 314                          * Some kinds of LLC packet we cannot
 315                          * handle intelligently
 316                          */
 317                         if (!eflag)
 318                                 fddi_hdr_print(fddip, length + FDDI_HDRLEN,
 319                                     ESRC(&ehdr), EDST(&ehdr));
 320                         if (extracted_ethertype) {
 321                                 printf("(LLC %s) ",
 322                         etherproto_string(htons(extracted_ethertype)));
 323                         }
 324                         if (!suppress_default_print)
 325                                 default_print(p, caplen);
 326                 }
 327         } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
 328                 fddi_smt_print(p, caplen);
 329         else {
 330                 /* Some kinds of FDDI packet we cannot handle intelligently */
 331                 if (!eflag)
 332                         fddi_hdr_print(fddip, length + FDDI_HDRLEN, ESRC(&ehdr),
 333                             EDST(&ehdr));
 334                 if (!suppress_default_print)
 335                         default_print(p, caplen);
 336         }
 337 }
 338
 339 /*
 340  * This is the top level routine of the printer.  'p' points
 341  * to the FDDI header of the packet, 'h->ts' is the timestamp,
 342  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 343  * is the number of bytes actually captured.
 344  */
 345 u_int
 346 fddi_if_print(const struct pcap_pkthdr *h, register const u_char *p)
 347 {
 348         fddi_print(p, h->len, h->caplen);
 349
 350         return (FDDI_HDRLEN);
 351 }