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, NULL }
 119 };
 120
 121 static void
 122 arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
 123              u_int flag, u_int seqid)
 124 {
 125         const struct arc_header *ap;
 126         const char *arctypename;
 127
 128         ndo->ndo_protocol = "arcnet";
 129         ap = (const struct arc_header *)bp;
 130
 131         if (ndo->ndo_qflag) {
 132                 ND_PRINT("%02x %02x %u: ",
 133                              GET_U_1(ap->arc_shost),
 134                              GET_U_1(ap->arc_dhost),
 135                              length);
 136                 return;
 137         }
 138
 139         arctypename = tok2str(arctypemap, "%02x", GET_U_1(ap->arc_type));
 140
 141         if (!phds) {
 142                 ND_PRINT("%02x %02x %s %u: ",
 143                              GET_U_1(ap->arc_shost),
 144                              GET_U_1(ap->arc_dhost),
 145                              arctypename,
 146                              length);
 147                 return;
 148         }
 149
 150         if (flag == 0) {
 151                 ND_PRINT("%02x %02x %s seqid %04x %u: ",
 152                         GET_U_1(ap->arc_shost),
 153                         GET_U_1(ap->arc_dhost),
 154                         arctypename, seqid,
 155                         length);
 156                 return;
 157         }
 158
 159         if (flag & 1)
 160                 ND_PRINT("%02x %02x %s seqid %04x "
 161                         "(first of %u fragments) %u: ",
 162                         GET_U_1(ap->arc_shost),
 163                         GET_U_1(ap->arc_dhost),
 164                         arctypename, seqid,
 165                         (flag + 3) / 2, length);
 166         else
 167                 ND_PRINT("%02x %02x %s seqid %04x "
 168                         "(fragment %u) %u: ",
 169                         GET_U_1(ap->arc_shost),
 170                         GET_U_1(ap->arc_dhost),
 171                         arctypename, seqid,
 172                         flag/2 + 1, length);
 173 }
 174
 175 /*
 176  * This is the top level routine of the printer.  'p' points
 177  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 178  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 179  * is the number of bytes actually captured.
 180  */
 181 void
 182 arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 183 {
 184         u_int caplen = h->caplen;
 185         u_int length = h->len;
 186         const struct arc_header *ap;
 187
 188         int phds;
 189         u_int flag = 0, archdrlen = 0;
 190         u_int seqid = 0;
 191         u_char arc_type;
 192
 193         ndo->ndo_protocol = "arcnet";
 194         if (caplen < ARC_HDRLEN) {
 195                 nd_print_trunc(ndo);
 196                 ndo->ndo_ll_hdr_len += caplen;
 197                 return;
 198         }
 199
 200         ap = (const struct arc_header *)p;
 201         arc_type = GET_U_1(ap->arc_type);
 202
 203         switch (arc_type) {
 204         default:
 205                 phds = 1;
 206                 break;
 207         case ARCTYPE_IP_OLD:
 208         case ARCTYPE_ARP_OLD:
 209         case ARCTYPE_DIAGNOSE:
 210                 phds = 0;
 211                 archdrlen = ARC_HDRLEN;
 212                 break;
 213         }
 214
 215         if (phds) {
 216                 if (caplen < ARC_HDRNEWLEN) {
 217                         arcnet_print(ndo, p, length, 0, 0, 0);
 218                         ND_PRINT(" phds");
 219                         nd_print_trunc(ndo);
 220                         ndo->ndo_ll_hdr_len += caplen;
 221                         return;
 222                 }
 223
 224                 flag = GET_U_1(ap->arc_flag);
 225                 if (flag == 0xff) {
 226                         if (caplen < ARC_HDRNEWLEN_EXC) {
 227                                 arcnet_print(ndo, p, length, 0, 0, 0);
 228                                 ND_PRINT(" phds extended");
 229                                 nd_print_trunc(ndo);
 230                                 ndo->ndo_ll_hdr_len += caplen;
 231                                 return;
 232                         }
 233                         flag = GET_U_1(ap->arc_flag2);
 234                         seqid = GET_BE_U_2(ap->arc_seqid2);
 235                         archdrlen = ARC_HDRNEWLEN_EXC;
 236                 } else {
 237                         seqid = GET_BE_U_2(ap->arc_seqid);
 238                         archdrlen = ARC_HDRNEWLEN;
 239                 }
 240         }
 241
 242
 243         if (ndo->ndo_eflag)
 244                 arcnet_print(ndo, p, length, phds, flag, seqid);
 245
 246         /*
 247          * Go past the ARCNET header.
 248          */
 249         length -= archdrlen;
 250         caplen -= archdrlen;
 251         p += archdrlen;
 252
 253         if (phds && flag && (flag & 1) == 0) {
 254                 /*
 255                  * This is a middle fragment.
 256                  */
 257                 ndo->ndo_ll_hdr_len += archdrlen;
 258                 return;
 259         }
 260
 261         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 262                 ND_DEFAULTPRINT(p, caplen);
 263
 264         ndo->ndo_ll_hdr_len += archdrlen;
 265 }
 266
 267 /*
 268  * This is the top level routine of the printer.  'p' points
 269  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 270  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 271  * is the number of bytes actually captured.  It is quite similar
 272  * to the non-Linux style printer except that Linux doesn't ever
 273  * supply packets that look like exception frames, it always supplies
 274  * reassembled packets rather than raw frames, and headers have an
 275  * extra "offset" field between the src/dest and packet type.
 276  */
 277 void
 278 arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 279 {
 280         u_int caplen = h->caplen;
 281         u_int length = h->len;
 282         const struct arc_linux_header *ap;
 283
 284         int archdrlen = 0;
 285         u_char arc_type;
 286
 287         ndo->ndo_protocol = "arcnet_linux";
 288         if (caplen < ARC_LINUX_HDRLEN) {
 289                 nd_print_trunc(ndo);
 290                 ndo->ndo_ll_hdr_len += caplen;
 291                 return;
 292         }
 293
 294         ap = (const struct arc_linux_header *)p;
 295         arc_type = GET_U_1(ap->arc_type);
 296
 297         switch (arc_type) {
 298         default:
 299                 archdrlen = ARC_LINUX_HDRNEWLEN;
 300                 if (caplen < ARC_LINUX_HDRNEWLEN) {
 301                         nd_print_trunc(ndo);
 302                         ndo->ndo_ll_hdr_len += caplen;
 303                         return;
 304                 }
 305                 break;
 306         case ARCTYPE_IP_OLD:
 307         case ARCTYPE_ARP_OLD:
 308         case ARCTYPE_DIAGNOSE:
 309                 archdrlen = ARC_LINUX_HDRLEN;
 310                 break;
 311         }
 312
 313         if (ndo->ndo_eflag)
 314                 arcnet_print(ndo, p, length, 0, 0, 0);
 315
 316         /*
 317          * Go past the ARCNET header.
 318          */
 319         length -= archdrlen;
 320         caplen -= archdrlen;
 321         p += archdrlen;
 322
 323         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 324                 ND_DEFAULTPRINT(p, caplen);
 325
 326         ndo->ndo_ll_hdr_len += archdrlen;
 327 }
 328
 329 /*
 330  * Prints the packet encapsulated in an ARCnet data field,
 331  * given the ARCnet system code.
 332  *
 333  * Returns non-zero if it can do so, zero if the system code is unknown.
 334  */
 335
 336
 337 static int
 338 arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
 339     u_int length, u_int caplen)
 340 {
 341         switch (arctype) {
 342
 343         case ARCTYPE_IP_OLD:
 344         case ARCTYPE_IP:
 345                 ip_print(ndo, p, length);
 346                 return (1);
 347
 348         case ARCTYPE_INET6:
 349                 ip6_print(ndo, p, length);
 350                 return (1);
 351
 352         case ARCTYPE_ARP_OLD:
 353         case ARCTYPE_ARP:
 354         case ARCTYPE_REVARP:
 355                 arp_print(ndo, p, length, caplen);
 356                 return (1);
 357
 358         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 359                 if (ndo->ndo_vflag)
 360                         ND_PRINT("et1 ");
 361                 atalk_print(ndo, p, length);
 362                 return (1);
 363
 364         case ARCTYPE_IPX:
 365                 ipx_print(ndo, p, length);
 366                 return (1);
 367
 368         default:
 369                 return (0);
 370         }
 371 }