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 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32
  33 /*
  34  * from: NetBSD: if_arc.h,v 1.13 1999/11/19 20:41:19 thorpej Exp
  35  */
  36
  37 /*
  38  * Structure of a 2.5MB/s Arcnet header on the BSDs,
  39  * as given to interface code.
  40  */
  41 struct  arc_header {
  42         uint8_t  arc_shost;
  43         uint8_t  arc_dhost;
  44         uint8_t  arc_type;
  45         /*
  46          * only present for newstyle encoding with LL fragmentation.
  47          * Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
  48          */
  49         uint8_t  arc_flag;
  50         uint16_t arc_seqid;
  51
  52         /*
  53          * only present in exception packets (arc_flag == 0xff)
  54          */
  55         uint8_t  arc_type2;     /* same as arc_type */
  56         uint8_t  arc_flag2;     /* real flag value */
  57         uint16_t arc_seqid2;    /* real seqid value */
  58 };
  59
  60 #define ARC_HDRLEN              3
  61 #define ARC_HDRNEWLEN           6
  62 #define ARC_HDRNEWLEN_EXC       10
  63
  64 /* RFC 1051 */
  65 #define ARCTYPE_IP_OLD          240     /* IP protocol */
  66 #define ARCTYPE_ARP_OLD         241     /* address resolution protocol */
  67
  68 /* RFC 1201 */
  69 #define ARCTYPE_IP              212     /* IP protocol */
  70 #define ARCTYPE_ARP             213     /* address resolution protocol */
  71 #define ARCTYPE_REVARP          214     /* reverse addr resolution protocol */
  72
  73 #define ARCTYPE_ATALK           221     /* Appletalk */
  74 #define ARCTYPE_BANIAN          247     /* Banyan Vines */
  75 #define ARCTYPE_IPX             250     /* Novell IPX */
  76
  77 #define ARCTYPE_INET6           0xc4    /* IPng */
  78 #define ARCTYPE_DIAGNOSE        0x80    /* as per ANSI/ATA 878.1 */
  79
  80 /*
  81  * Structure of a 2.5MB/s Arcnet header on Linux.  Linux has
  82  * an extra "offset" field when given to interface code, and
  83  * never presents packets that look like exception frames.
  84  */
  85 struct  arc_linux_header {
  86         uint8_t  arc_shost;
  87         uint8_t  arc_dhost;
  88         uint16_t arc_offset;
  89         uint8_t  arc_type;
  90         /*
  91          * only present for newstyle encoding with LL fragmentation.
  92          * Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
  93          * instead.
  94          */
  95         uint8_t  arc_flag;
  96         uint16_t arc_seqid;
  97 };
  98
  99 #define ARC_LINUX_HDRLEN        5
 100 #define ARC_LINUX_HDRNEWLEN     8
 101
 102 static int arcnet_encap_print(netdissect_options *, u_char arctype, const u_char *p,
 103     u_int length, u_int caplen);
 104
 105 static const struct tok arctypemap[] = {
 106         { ARCTYPE_IP_OLD,       "oldip" },
 107         { ARCTYPE_ARP_OLD,      "oldarp" },
 108         { ARCTYPE_IP,           "ip" },
 109         { ARCTYPE_ARP,          "arp" },
 110         { ARCTYPE_REVARP,       "rarp" },
 111         { ARCTYPE_ATALK,        "atalk" },
 112         { ARCTYPE_BANIAN,       "banyan" },
 113         { ARCTYPE_IPX,          "ipx" },
 114         { ARCTYPE_INET6,        "ipv6" },
 115         { ARCTYPE_DIAGNOSE,     "diag" },
 116         { 0, 0 }
 117 };
 118
 119 static inline void
 120 arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
 121              int flag, u_int seqid)
 122 {
 123         const struct arc_header *ap;
 124         const char *arctypename;
 125
 126
 127         ap = (const struct arc_header *)bp;
 128
 129
 130         if (ndo->ndo_qflag) {
 131                 ND_PRINT((ndo, "%02x %02x %d: ",
 132                              ap->arc_shost,
 133                              ap->arc_dhost,
 134                              length));
 135                 return;
 136         }
 137
 138         arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
 139
 140         if (!phds) {
 141                 ND_PRINT((ndo, "%02x %02x %s %d: ",
 142                              ap->arc_shost, ap->arc_dhost, arctypename,
 143                              length));
 144                              return;
 145         }
 146
 147         if (flag == 0) {
 148                 ND_PRINT((ndo, "%02x %02x %s seqid %04x %d: ",
 149                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 150                         length));
 151                         return;
 152         }
 153
 154         if (flag & 1)
 155                 ND_PRINT((ndo, "%02x %02x %s seqid %04x "
 156                         "(first of %d fragments) %d: ",
 157                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 158                         (flag + 3) / 2, length));
 159         else
 160                 ND_PRINT((ndo, "%02x %02x %s seqid %04x "
 161                         "(fragment %d) %d: ",
 162                         ap->arc_shost, ap->arc_dhost, arctypename, seqid,
 163                         flag/2 + 1, length));
 164 }
 165
 166 /*
 167  * This is the top level routine of the printer.  'p' points
 168  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 169  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 170  * is the number of bytes actually captured.
 171  */
 172 u_int
 173 arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 174 {
 175         u_int caplen = h->caplen;
 176         u_int length = h->len;
 177         const struct arc_header *ap;
 178
 179         int phds, flag = 0, archdrlen = 0;
 180         u_int seqid = 0;
 181         u_char arc_type;
 182
 183         if (caplen < ARC_HDRLEN || length < ARC_HDRLEN) {
 184                 ND_PRINT((ndo, "[|arcnet]"));
 185                 return (caplen);
 186         }
 187
 188         ap = (const struct arc_header *)p;
 189         arc_type = ap->arc_type;
 190
 191         switch (arc_type) {
 192         default:
 193                 phds = 1;
 194                 break;
 195         case ARCTYPE_IP_OLD:
 196         case ARCTYPE_ARP_OLD:
 197         case ARCTYPE_DIAGNOSE:
 198                 phds = 0;
 199                 archdrlen = ARC_HDRLEN;
 200                 break;
 201         }
 202
 203         if (phds) {
 204                 if (caplen < ARC_HDRNEWLEN || length < ARC_HDRNEWLEN) {
 205                         arcnet_print(ndo, p, length, 0, 0, 0);
 206                         ND_PRINT((ndo, "[|phds]"));
 207                         return (caplen);
 208                 }
 209
 210                 if (ap->arc_flag == 0xff) {
 211                         if (caplen < ARC_HDRNEWLEN_EXC || length < ARC_HDRNEWLEN_EXC) {
 212                                 arcnet_print(ndo, p, length, 0, 0, 0);
 213                                 ND_PRINT((ndo, "[|phds extended]"));
 214                                 return (caplen);
 215                         }
 216                         flag = ap->arc_flag2;
 217                         seqid = EXTRACT_16BITS(&ap->arc_seqid2);
 218                         archdrlen = ARC_HDRNEWLEN_EXC;
 219                 } else {
 220                         flag = ap->arc_flag;
 221                         seqid = EXTRACT_16BITS(&ap->arc_seqid);
 222                         archdrlen = ARC_HDRNEWLEN;
 223                 }
 224         }
 225
 226
 227         if (ndo->ndo_eflag)
 228                 arcnet_print(ndo, p, length, phds, flag, seqid);
 229
 230         /*
 231          * Go past the ARCNET header.
 232          */
 233         length -= archdrlen;
 234         caplen -= archdrlen;
 235         p += archdrlen;
 236
 237         if (phds && flag && (flag & 1) == 0) {
 238                 /*
 239                  * This is a middle fragment.
 240                  */
 241                 return (archdrlen);
 242         }
 243
 244         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 245                 ND_DEFAULTPRINT(p, caplen);
 246
 247         return (archdrlen);
 248 }
 249
 250 /*
 251  * This is the top level routine of the printer.  'p' points
 252  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
 253  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 254  * is the number of bytes actually captured.  It is quite similar
 255  * to the non-Linux style printer except that Linux doesn't ever
 256  * supply packets that look like exception frames, it always supplies
 257  * reassembled packets rather than raw frames, and headers have an
 258  * extra "offset" field between the src/dest and packet type.
 259  */
 260 u_int
 261 arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 262 {
 263         u_int caplen = h->caplen;
 264         u_int length = h->len;
 265         const struct arc_linux_header *ap;
 266
 267         int archdrlen = 0;
 268         u_char arc_type;
 269
 270         if (caplen < ARC_LINUX_HDRLEN || length < ARC_LINUX_HDRLEN) {
 271                 ND_PRINT((ndo, "[|arcnet]"));
 272                 return (caplen);
 273         }
 274
 275         ap = (const struct arc_linux_header *)p;
 276         arc_type = ap->arc_type;
 277
 278         switch (arc_type) {
 279         default:
 280                 archdrlen = ARC_LINUX_HDRNEWLEN;
 281                 if (caplen < ARC_LINUX_HDRNEWLEN || length < ARC_LINUX_HDRNEWLEN) {
 282                         ND_PRINT((ndo, "[|arcnet]"));
 283                         return (caplen);
 284                 }
 285                 break;
 286         case ARCTYPE_IP_OLD:
 287         case ARCTYPE_ARP_OLD:
 288         case ARCTYPE_DIAGNOSE:
 289                 archdrlen = ARC_LINUX_HDRLEN;
 290                 break;
 291         }
 292
 293         if (ndo->ndo_eflag)
 294                 arcnet_print(ndo, p, length, 0, 0, 0);
 295
 296         /*
 297          * Go past the ARCNET header.
 298          */
 299         length -= archdrlen;
 300         caplen -= archdrlen;
 301         p += archdrlen;
 302
 303         if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
 304                 ND_DEFAULTPRINT(p, caplen);
 305
 306         return (archdrlen);
 307 }
 308
 309 /*
 310  * Prints the packet encapsulated in an ARCnet data field,
 311  * given the ARCnet system code.
 312  *
 313  * Returns non-zero if it can do so, zero if the system code is unknown.
 314  */
 315
 316
 317 static int
 318 arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
 319     u_int length, u_int caplen)
 320 {
 321         switch (arctype) {
 322
 323         case ARCTYPE_IP_OLD:
 324         case ARCTYPE_IP:
 325                 ip_print(ndo, p, length);
 326                 return (1);
 327
 328         case ARCTYPE_INET6:
 329                 ip6_print(ndo, p, length);
 330                 return (1);
 331
 332         case ARCTYPE_ARP_OLD:
 333         case ARCTYPE_ARP:
 334         case ARCTYPE_REVARP:
 335                 arp_print(ndo, p, length, caplen);
 336                 return (1);
 337
 338         case ARCTYPE_ATALK:     /* XXX was this ever used? */
 339                 if (ndo->ndo_vflag)
 340                         ND_PRINT((ndo, "et1 "));
 341                 atalk_print(ndo, p, length);
 342                 return (1);
 343
 344         case ARCTYPE_IPX:
 345                 ipx_print(ndo, p, length);
 346                 return (1);
 347
 348         default:
 349                 return (0);
 350         }
 351 }
 352
 353 /*
 354  * Local Variables:
 355  * c-style: bsd
 356  * End:
 357  */
 358