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

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 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  * From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
  22  */
  23
  24 /* \summary: Attached Resource Computer NETwork (ARCNET) printer */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <netdissect-stdinc.h>
  31
  32 #include "netdissect.h"
  33 #include "extract.h"
  34
  35 /*
  36  * from: NetBSD: if_arc.h,v 1.13 1999/11/19 20:41:19 thorpej Exp
  37  */
  38
  39 /*
  40  * Structure of a 2.5MB/s Arcnet header on the BSDs,
  41  * as given to interface code.
  42  */
  43 struct  arc_header {
  44         nd_uint8_t  arc_shost;
  45         nd_uint8_t  arc_dhost;
  46         nd_uint8_t  arc_type;
  47         /*
  48          * only present for newstyle encoding with LL fragmentation.
  49          * Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
  50          */
  51         nd_uint8_t  arc_flag;
  52         nd_uint16_t arc_seqid;
  53
  54         /*
  55          * only present in exception packets (arc_flag == 0xff)
  56          */
  57         nd_uint8_t  arc_type2;  /* same as arc_type */
  58         nd_uint8_t  arc_flag2;  /* real flag value */
  59         nd_uint16_t arc_seqid2; /* real seqid value */
  60 };
  61
  62 #define ARC_HDRLEN              3
  63 #define ARC_HDRNEWLEN           6
  64 #define ARC_HDRNEWLEN_EXC       10
  65
  66 /* RFC 1051 */
  67 #define ARCTYPE_IP_OLD          240     /* IP protocol */
  68 #define ARCTYPE_ARP_OLD         241     /* address resolution protocol */
  69
  70 /* RFC 1201 */
  71 #define ARCTYPE_IP              212     /* IP protocol */
  72 #define ARCTYPE_ARP             213     /* address resolution protocol */
  73 #define ARCTYPE_REVARP          214     /* reverse addr resolution protocol */
  74
  75 #define ARCTYPE_ATALK           221     /* Appletalk */
  76 #define ARCTYPE_BANIAN          247     /* Banyan Vines */
  77 #define ARCTYPE_IPX             250     /* Novell IPX */
  78
  79 #define ARCTYPE_INET6           0xc4    /* IPng */
  80 #define ARCTYPE_DIAGNOSE        0x80    /* as per ANSI/ATA 878.1 */
  81
  82 /*
  83  * Structure of a 2.5MB/s Arcnet header on Linux.  Linux has
  84  * an extra "offset" field when given to interface code, and
  85  * never presents packets that look like exception frames.
  86  */
  87 struct  arc_linux_header {
  88         nd_uint8_t  arc_shost;
  89         nd_uint8_t  arc_dhost;
  90         nd_uint16_t arc_offset;
  91         nd_uint8_t  arc_type;
  92         /*
  93          * only present for newstyle encoding with LL fragmentation.
  94          * Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
  95          * instead.
  96          */
  97         nd_uint8_t  arc_flag;
  98         nd_uint16_t arc_seqid;
  99 };
 100
 101 #define ARC_LINUX_HDRLEN        5
 102 #define ARC_LINUX_HDRNEWLEN     8
 103
 104 static int arcnet_encap_print(netdissect_options *, u_char arctype, const u_char *p,
 105     u_int length, u_int caplen);
 106
 107 static const struct tok arctypemap[] = {
 108         { ARCTYPE_IP_OLD,       "oldip" },
 109         { ARCTYPE_ARP_OLD,      "oldarp" },
 110         { ARCTYPE_IP,           "ip" },
 111         { ARCTYPE_ARP,          "arp" },
 112         { ARCTYPE_REVARP,       "rarp" },
 113         { ARCTYPE_ATALK,        "atalk" },
 114         { ARCTYPE_BANIAN,       "banyan" },
 115         { ARCTYPE_IPX,          "ipx" },
 116         { ARCTYPE_INET6,        "ipv6" },
 117         { ARCTYPE_DIAGNOSE,     "diag" },
 118         { 0, 0 }
 119 };
 120
 121 static inline void
 122 arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
 123              int flag, u_int seqid)
 124 {
 125         const struct arc_header *ap;
 126         const char *arctypename;
 127
 128
 129         ap = (const struct arc_header *)bp;
 130
 131
 132         if (ndo->ndo_qflag) {
 133                 ND_PRINT("%02x %02x %u: ",
 134                              EXTRACT_U_1(ap->arc_shost),
 135                              EXTRACT_U_1(ap->arc_dhost),
 136                              length);
 137                 return;
 138         }
 139
 140         arctypename = tok2str(arctypemap, "%02x", EXTRACT_U_1(ap->arc_type));
 141
 142         if (!phds) {
 143                 ND_PRINT("%02x %02x %s %d: ",
 144                              EXTRACT_U_1(ap->arc_shost),
 145                              EXTRACT_U_1(ap->arc_dhost),
 146                              arctypename,
 147                              length);
 148                 return;
 149         }
 150
 151         if (flag == 0) {
 152                 ND_PRINT("%02x %02x %s seqid %04x %d: ",
 153                         EXTRACT_U_1(ap->arc_shost),
 154                         EXTRACT_U_1(ap->arc_dhost),
 155                         arctypename, seqid,
 156                         length);
 157                 return;
 158         }
 159
 160         if (flag & 1)
 161                 ND_PRINT("%02x %02x %s seqid %04x "
 162                         "(first of %d fragments) %d: ",
 163                         EXTRACT_U_1(ap->arc_shost),
 164                         EXTRACT_U_1(ap->arc_dhost),
 165                         arctypename, seqid,
 166                         (flag + 3) / 2, length);
 167         else
 168                 ND_PRINT("%02x %02x %s seqid %04x "
 169                         "(fragment %d) %d: ",
 170                         EXTRACT_U_1(ap->arc_shost),
 171                         EXTRACT_U_1(ap->arc_dhost),
 172                         arctypename, seqid,
 173                         flag/2 + 1, length);
 174 }
 175
 176 /*
 177  * This is the top level routine of the printer.  'p' points
 178  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 179  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 180  * is the number of bytes actually captured.
 181  */
 182 u_int
 183 arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 184 {
 185         u_int caplen = h->caplen;
 186         u_int length = h->len;
 187         const struct arc_header *ap;
 188
 189         int phds, flag = 0, archdrlen = 0;
 190         u_int seqid = 0;
 191         u_char arc_type;
 192
 193         if (caplen < ARC_HDRLEN || length < ARC_HDRLEN) {
 194                 ND_PRINT("[|arcnet]");
 195                 return (caplen);
 196         }
 197
 198         ap = (const struct arc_header *)p;
 199         arc_type = EXTRACT_U_1(ap->arc_type);
 200
 201         switch (arc_type) {
 202         default:
 203                 phds = 1;
 204                 break;
 205         case ARCTYPE_IP_OLD:
 206         case ARCTYPE_ARP_OLD:
 207         case ARCTYPE_DIAGNOSE:
 208                 phds = 0;
 209                 archdrlen = ARC_HDRLEN;
 210                 break;
 211         }
 212
 213         if (phds) {
 214                 if (caplen < ARC_HDRNEWLEN || length < ARC_HDRNEWLEN) {
 215                         arcnet_print(ndo, p, length, 0, 0, 0);
 216                         ND_PRINT("[|phds]");
 217                         return (caplen);
 218                 }
 219
 220                 flag = EXTRACT_U_1(ap->arc_flag);
 221                 if (flag == 0xff) {
 222                         if (caplen < ARC_HDRNEWLEN_EXC || length < ARC_HDRNEWLEN_EXC) {
 223                                 arcnet_print(ndo, p, length, 0, 0, 0);
 224                                 ND_PRINT("[|phds extended]");
 225                                 return (caplen);
 226                         }
 227                         flag = EXTRACT_U_1(ap->arc_flag2);
 228                         seqid = EXTRACT_BE_U_2(ap->arc_seqid2);
 229                         archdrlen = ARC_HDRNEWLEN_EXC;
 230                 } else {
 231                         seqid = EXTRACT_BE_U_2(ap->arc_seqid);
 232                         archdrlen = ARC_HDRNEWLEN;
 233                 }
 234         }
 235
 236
 237         if (ndo->ndo_eflag)
 238                 arcnet_print(ndo, p, length, phds, flag, seqid);
 239
 240         /*
 241          * Go past the ARCNET header.
 242          */
 243         length -= archdrlen;
 244         caplen -= archdrlen;
 245         p += archdrlen;
 246
 247         if (phds && flag && (flag & 1) == 0) {
 248                 /*
 249                  * This is a middle fragment.
 250                  */
 251                 return (archdrlen);
 252         }
 253
 254         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 255                 ND_DEFAULTPRINT(p, caplen);
 256
 257         return (archdrlen);
 258 }
 259
 260 /*
 261  * This is the top level routine of the printer.  'p' points
 262  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 263  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 264  * is the number of bytes actually captured.  It is quite similar
 265  * to the non-Linux style printer except that Linux doesn't ever
 266  * supply packets that look like exception frames, it always supplies
 267  * reassembled packets rather than raw frames, and headers have an
 268  * extra "offset" field between the src/dest and packet type.
 269  */
 270 u_int
 271 arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 272 {
 273         u_int caplen = h->caplen;
 274         u_int length = h->len;
 275         const struct arc_linux_header *ap;
 276
 277         int archdrlen = 0;
 278         u_char arc_type;
 279
 280         if (caplen < ARC_LINUX_HDRLEN || length < ARC_LINUX_HDRLEN) {
 281                 ND_PRINT("[|arcnet]");
 282                 return (caplen);
 283         }
 284
 285         ap = (const struct arc_linux_header *)p;
 286         arc_type = EXTRACT_U_1(ap->arc_type);
 287
 288         switch (arc_type) {
 289         default:
 290                 archdrlen = ARC_LINUX_HDRNEWLEN;
 291                 if (caplen < ARC_LINUX_HDRNEWLEN || length < ARC_LINUX_HDRNEWLEN) {
 292                         ND_PRINT("[|arcnet]");
 293                         return (caplen);
 294                 }
 295                 break;
 296         case ARCTYPE_IP_OLD:
 297         case ARCTYPE_ARP_OLD:
 298         case ARCTYPE_DIAGNOSE:
 299                 archdrlen = ARC_LINUX_HDRLEN;
 300                 break;
 301         }
 302
 303         if (ndo->ndo_eflag)
 304                 arcnet_print(ndo, p, length, 0, 0, 0);
 305
 306         /*
 307          * Go past the ARCNET header.
 308          */
 309         length -= archdrlen;
 310         caplen -= archdrlen;
 311         p += archdrlen;
 312
 313         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 314                 ND_DEFAULTPRINT(p, caplen);
 315
 316         return (archdrlen);
 317 }
 318
 319 /*
 320  * Prints the packet encapsulated in an ARCnet data field,
 321  * given the ARCnet system code.
 322  *
 323  * Returns non-zero if it can do so, zero if the system code is unknown.
 324  */
 325
 326
 327 static int
 328 arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
 329     u_int length, u_int caplen)
 330 {
 331         switch (arctype) {
 332
 333         case ARCTYPE_IP_OLD:
 334         case ARCTYPE_IP:
 335                 ip_print(ndo, p, length);
 336                 return (1);
 337
 338         case ARCTYPE_INET6:
 339                 ip6_print(ndo, p, length);
 340                 return (1);
 341
 342         case ARCTYPE_ARP_OLD:
 343         case ARCTYPE_ARP:
 344         case ARCTYPE_REVARP:
 345                 arp_print(ndo, p, length, caplen);
 346                 return (1);
 347
 348         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 349                 if (ndo->ndo_vflag)
 350                         ND_PRINT("et1 ");
 351                 atalk_print(ndo, p, length);
 352                 return (1);
 353
 354         case ARCTYPE_IPX:
 355                 ipx_print(ndo, p, length);
 356                 return (1);
 357
 358         default:
 359                 return (0);
 360         }
 361 }
 362
 363 /*
 364  * Local Variables:
 365  * c-style: bsd
 366  * End:
 367  */
 368