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 #ifndef lint
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/print-fddi.c,v 1.46 2000-10-06 04:23:11 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34 #include <sys/file.h>
  35 #include <sys/ioctl.h>
  36
  37 #include <netinet/in.h>
  38
  39 #include <ctype.h>
  40 #include <netdb.h>
  41 #include <pcap.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47 #include "ethertype.h"
  48
  49 #include "ether.h"
  50 #include "fddi.h"
  51
  52 /*
  53  * Some FDDI interfaces use bit-swapped addresses.
  54  */
  55 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__)
  56 int     fddi_bitswap = 0;
  57 #else
  58 int     fddi_bitswap = 1;
  59 #endif
  60
  61 /*
  62  * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992
  63  *
  64  * Based in part on code by Van Jacobson, which bears this note:
  65  *
  66  * NOTE:  This is a very preliminary hack for FDDI support.
  67  * There are all sorts of wired in constants & nothing (yet)
  68  * to print SMT packets as anything other than hex dumps.
  69  * Most of the necessary changes are waiting on my redoing
  70  * the "header" that a kernel fddi driver supplies to bpf:  I
  71  * want it to look like one byte of 'direction' (0 or 1
  72  * depending on whether the packet was inbound or outbound),
  73  * two bytes of system/driver dependent data (anything an
  74  * implementor thinks would be useful to filter on and/or
  75  * save per-packet, then the real 21-byte FDDI header.
  76  * Steve McCanne & I have also talked about adding the
  77  * 'direction' byte to all bpf headers (e.g., in the two
  78  * bytes of padding on an ethernet header).  It's not clear
  79  * we could do this in a backwards compatible way & we hate
  80  * the idea of an incompatible bpf change.  Discussions are
  81  * proceeding.
  82  *
  83  * Also, to really support FDDI (and better support 802.2
  84  * over ethernet) we really need to re-think the rather simple
  85  * minded assumptions about fixed length & fixed format link
  86  * level headers made in gencode.c.  One day...
  87  *
  88  *  - vj
  89  */
  90
  91 #define FDDI_HDRLEN (sizeof(struct fddi_header))
  92
  93 static u_char fddi_bit_swap[] = {
  94         0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
  95         0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
  96         0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
  97         0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
  98         0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
  99         0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
 100         0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
 101         0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
 102         0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
 103         0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
 104         0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
 105         0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
 106         0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
 107         0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
 108         0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
 109         0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
 110         0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
 111         0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
 112         0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
 113         0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
 114         0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
 115         0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
 116         0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
 117         0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
 118         0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
 119         0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
 120         0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
 121         0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
 122         0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
 123         0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
 124         0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
 125         0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
 126 };
 127
 128 /*
 129  * Print FDDI frame-control bits
 130  */
 131 static inline void
 132 print_fddi_fc(u_char fc)
 133 {
 134         switch (fc) {
 135
 136         case FDDIFC_VOID:                         /* Void frame */
 137                 printf("void ");
 138                 break;
 139
 140         case FDDIFC_NRT:                          /* Nonrestricted token */
 141                 printf("nrt ");
 142                 break;
 143
 144         case FDDIFC_RT:                           /* Restricted token */
 145                 printf("rt ");
 146                 break;
 147
 148         case FDDIFC_SMT_INFO:                     /* SMT Info */
 149                 printf("info ");
 150                 break;
 151
 152         case FDDIFC_SMT_NSA:                      /* SMT Next station adrs */
 153                 printf("nsa ");
 154                 break;
 155
 156         case FDDIFC_MAC_BEACON:                   /* MAC Beacon frame */
 157                 printf("beacon ");
 158                 break;
 159
 160         case FDDIFC_MAC_CLAIM:                    /* MAC Claim frame */
 161                 printf("claim ");
 162                 break;
 163
 164         default:
 165                 switch (fc & FDDIFC_CLFF) {
 166
 167                 case FDDIFC_MAC:
 168                         printf("mac%1x ", fc & FDDIFC_ZZZZ);
 169                         break;
 170
 171                 case FDDIFC_SMT:
 172                         printf("smt%1x ", fc & FDDIFC_ZZZZ);
 173                         break;
 174
 175                 case FDDIFC_LLC_ASYNC:
 176                         printf("async%1x ", fc & FDDIFC_ZZZZ);
 177                         break;
 178
 179                 case FDDIFC_LLC_SYNC:
 180                         printf("sync%1x ", fc & FDDIFC_ZZZZ);
 181                         break;
 182
 183                 case FDDIFC_IMP_ASYNC:
 184                         printf("imp_async%1x ", fc & FDDIFC_ZZZZ);
 185                         break;
 186
 187                 case FDDIFC_IMP_SYNC:
 188                         printf("imp_sync%1x ", fc & FDDIFC_ZZZZ);
 189                         break;
 190
 191                 default:
 192                         printf("%02x ", fc);
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 /* Extract src, dst addresses */
 199 static inline void
 200 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst)
 201 {
 202         register int i;
 203
 204         if (fddi_bitswap) {
 205                 /*
 206                  * bit-swap the fddi addresses (isn't the IEEE standards
 207                  * process wonderful!) then convert them to names.
 208                  */
 209                 for (i = 0; i < 6; ++i)
 210                         fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]];
 211                 for (i = 0; i < 6; ++i)
 212                         fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]];
 213         }
 214         else {
 215                 memcpy(fdst, (char *)fddip->fddi_dhost, 6);
 216                 memcpy(fsrc, (char *)fddip->fddi_shost, 6);
 217         }
 218 }
 219
 220 /*
 221  * Print the FDDI MAC header
 222  */
 223 static inline void
 224 fddi_print(register const struct fddi_header *fddip, register u_int length,
 225            register const u_char *fsrc, register const u_char *fdst)
 226 {
 227         char *srcname, *dstname;
 228
 229         srcname = etheraddr_string(fsrc);
 230         dstname = etheraddr_string(fdst);
 231
 232         if (vflag)
 233                 (void) printf("%02x %s %s %d: ",
 234                        fddip->fddi_fc,
 235                        srcname, dstname,
 236                        length);
 237         else if (qflag)
 238                 printf("%s %s %d: ", srcname, dstname, length);
 239         else {
 240                 (void) print_fddi_fc(fddip->fddi_fc);
 241                 (void) printf("%s %s %d: ", srcname, dstname, length);
 242         }
 243 }
 244
 245 static inline void
 246 fddi_smt_print(const u_char *p, u_int length)
 247 {
 248         printf("<SMT printer not yet implemented>");
 249 }
 250
 251 /*
 252  * This is the top level routine of the printer.  'sp' is the points
 253  * to the FDDI header of the packet, 'tvp' is the timestamp,
 254  * 'length' is the length of the packet off the wire, and 'caplen'
 255  * is the number of bytes actually captured.
 256  */
 257 void
 258 fddi_if_print(u_char *pcap, const struct pcap_pkthdr *h,
 259               register const u_char *p)
 260 {
 261         u_int caplen = h->caplen;
 262         u_int length = h->len;
 263         const struct fddi_header *fddip = (struct fddi_header *)p;
 264         struct ether_header ehdr;
 265         u_short extracted_ethertype;
 266
 267         ts_print(&h->ts);
 268
 269         if (caplen < FDDI_HDRLEN) {
 270                 printf("[|fddi]");
 271                 goto out;
 272         }
 273         /*
 274          * Get the FDDI addresses into a canonical form
 275          */
 276         extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
 277         /*
 278          * Some printers want to get back at the link level addresses,
 279          * and/or check that they're not walking off the end of the packet.
 280          * Rather than pass them all the way down, we set these globals.
 281          */
 282         snapend = p + caplen;
 283         /*
 284          * Actually, the only printer that uses packetp is print-bootp.c,
 285          * and it assumes that packetp points to an Ethernet header.  The
 286          * right thing to do is to fix print-bootp.c to know which link
 287          * type is in use when it excavates. XXX
 288          */
 289         packetp = (u_char *)&ehdr;
 290
 291         if (eflag)
 292                 fddi_print(fddip, length, ESRC(&ehdr), EDST(&ehdr));
 293
 294         /* Skip over FDDI MAC header */
 295         length -= FDDI_HDRLEN;
 296         p += FDDI_HDRLEN;
 297         caplen -= FDDI_HDRLEN;
 298
 299         /* Frame Control field determines interpretation of packet */
 300         extracted_ethertype = 0;
 301         if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
 302                 /* Try to print the LLC-layer header & higher layers */
 303                 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr))
 304                     == 0) {
 305                         /*
 306                          * Some kinds of LLC packet we cannot
 307                          * handle intelligently
 308                          */
 309                         if (!eflag)
 310                                 fddi_print(fddip, length,
 311                                     ESRC(&ehdr), EDST(&ehdr));
 312                         if (extracted_ethertype) {
 313                                 printf("(LLC %s) ",
 314                         etherproto_string(htons(extracted_ethertype)));
 315                         }
 316                         if (!xflag && !qflag)
 317                                 default_print(p, caplen);
 318                 }
 319         } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
 320                 fddi_smt_print(p, caplen);
 321         else {
 322                 /* Some kinds of FDDI packet we cannot handle intelligently */
 323                 if (!eflag)
 324                         fddi_print(fddip, length, ESRC(&ehdr), EDST(&ehdr));
 325                 if (!xflag && !qflag)
 326                         default_print(p, caplen);
 327         }
 328         if (xflag)
 329                 default_print(p, caplen);
 330 out:
 331         putchar('\n');
 332 }