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

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   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 /* \summary: Ethernet printer */
  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 #include "addrtoname.h"
  33 #include "ethertype.h"
  34 #include "ether.h"
  35
  36 const struct tok ethertype_values[] = {
  37     { ETHERTYPE_IP,             "IPv4" },
  38     { ETHERTYPE_MPLS,           "MPLS unicast" },
  39     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  40     { ETHERTYPE_IPV6,           "IPv6" },
  41     { ETHERTYPE_8021Q,          "802.1Q" },
  42     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  43     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  44     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  45     { ETHERTYPE_VMAN,           "VMAN" },
  46     { ETHERTYPE_PUP,            "PUP" },
  47     { ETHERTYPE_ARP,            "ARP"},
  48     { ETHERTYPE_REVARP,         "Reverse ARP"},
  49     { ETHERTYPE_NS,             "NS" },
  50     { ETHERTYPE_SPRITE,         "Sprite" },
  51     { ETHERTYPE_TRAIL,          "Trail" },
  52     { ETHERTYPE_MOPDL,          "MOP DL" },
  53     { ETHERTYPE_MOPRC,          "MOP RC" },
  54     { ETHERTYPE_DN,             "DN" },
  55     { ETHERTYPE_LAT,            "LAT" },
  56     { ETHERTYPE_SCA,            "SCA" },
  57     { ETHERTYPE_TEB,            "TEB" },
  58     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  59     { ETHERTYPE_DECDNS,         "DEC DNS" },
  60     { ETHERTYPE_DECDTS,         "DEC DTS" },
  61     { ETHERTYPE_VEXP,           "VEXP" },
  62     { ETHERTYPE_VPROD,          "VPROD" },
  63     { ETHERTYPE_ATALK,          "Appletalk" },
  64     { ETHERTYPE_AARP,           "Appletalk ARP" },
  65     { ETHERTYPE_IPX,            "IPX" },
  66     { ETHERTYPE_PPP,            "PPP" },
  67     { ETHERTYPE_MPCP,           "MPCP" },
  68     { ETHERTYPE_SLOW,           "Slow Protocols" },
  69     { ETHERTYPE_PPPOED,         "PPPoE D" },
  70     { ETHERTYPE_PPPOES,         "PPPoE S" },
  71     { ETHERTYPE_EAPOL,          "EAPOL" },
  72     { ETHERTYPE_RRCP,           "RRCP" },
  73     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  74     { ETHERTYPE_JUMBO,          "Jumbo" },
  75     { ETHERTYPE_NSH,            "NSH" },
  76     { ETHERTYPE_LOOPBACK,       "Loopback" },
  77     { ETHERTYPE_ISO,            "OSI" },
  78     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  79     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  80     { ETHERTYPE_CFM,            "CFM" },
  81     { ETHERTYPE_IEEE1905_1,     "IEEE1905.1" },
  82     { ETHERTYPE_LLDP,           "LLDP" },
  83     { ETHERTYPE_TIPC,           "TIPC"},
  84     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
  85     { ETHERTYPE_GEONET,         "GeoNet"},
  86     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
  87     { ETHERTYPE_AOE,            "AoE" },
  88     { ETHERTYPE_MEDSA,          "MEDSA" },
  89     { 0, NULL}
  90 };
  91
  92 static inline void
  93 ether_hdr_print(netdissect_options *ndo,
  94                 const u_char *bp, u_int length)
  95 {
  96         register const struct ether_header *ep;
  97         uint16_t length_type;
  98
  99         ep = (const struct ether_header *)bp;
 100
 101         ND_PRINT((ndo, "%s > %s",
 102                      etheraddr_string(ndo, ESRC(ep)),
 103                      etheraddr_string(ndo, EDST(ep))));
 104
 105         length_type = EXTRACT_BE_U_2(&ep->ether_length_type);
 106         if (!ndo->ndo_qflag) {
 107                 if (length_type <= ETHERMTU) {
 108                         ND_PRINT((ndo, ", 802.3"));
 109                         length = length_type;
 110                 } else
 111                         ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 112                                        tok2str(ethertype_values,"Unknown", length_type),
 113                                        length_type));
 114         } else {
 115                 if (length_type <= ETHERMTU) {
 116                         ND_PRINT((ndo, ", 802.3"));
 117                         length = length_type;
 118                 } else
 119                         ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)));
 120         }
 121
 122         ND_PRINT((ndo, ", length %u: ", length));
 123 }
 124
 125 /*
 126  * Print an Ethernet frame.
 127  * This might be encapsulated within another frame; we might be passed
 128  * a pointer to a function that can print header information for that
 129  * frame's protocol, and an argument to pass to that function.
 130  *
 131  * FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
 132  */
 133 u_int
 134 ether_print(netdissect_options *ndo,
 135             const u_char *p, u_int length, u_int caplen,
 136             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 137 {
 138         const struct ether_header *ep;
 139         u_int orig_length;
 140         u_short length_type;
 141         u_int hdrlen;
 142         int llc_hdrlen;
 143         struct lladdr_info src, dst;
 144
 145         if (caplen < ETHER_HDRLEN) {
 146                 ND_PRINT((ndo, "[|ether]"));
 147                 return (caplen);
 148         }
 149         if (length < ETHER_HDRLEN) {
 150                 ND_PRINT((ndo, "[|ether]"));
 151                 return (length);
 152         }
 153
 154         if (ndo->ndo_eflag) {
 155                 if (print_encap_header != NULL)
 156                         (*print_encap_header)(ndo, encap_header_arg);
 157                 ether_hdr_print(ndo, p, length);
 158         }
 159         orig_length = length;
 160
 161         length -= ETHER_HDRLEN;
 162         caplen -= ETHER_HDRLEN;
 163         ep = (const struct ether_header *)p;
 164         p += ETHER_HDRLEN;
 165         hdrlen = ETHER_HDRLEN;
 166
 167         src.addr = ESRC(ep);
 168         src.addr_string = etheraddr_string;
 169         dst.addr = EDST(ep);
 170         dst.addr_string = etheraddr_string;
 171         length_type = EXTRACT_BE_U_2(&ep->ether_length_type);
 172
 173 recurse:
 174         /*
 175          * Is it (gag) an 802.3 encapsulation?
 176          */
 177         if (length_type <= ETHERMTU) {
 178                 /* Try to print the LLC-layer header & higher layers */
 179                 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 180                 if (llc_hdrlen < 0) {
 181                         /* packet type not known, print raw packet */
 182                         if (!ndo->ndo_suppress_default_print)
 183                                 ND_DEFAULTPRINT(p, caplen);
 184                         llc_hdrlen = -llc_hdrlen;
 185                 }
 186                 hdrlen += llc_hdrlen;
 187         } else if (length_type == ETHERTYPE_8021Q  ||
 188                 length_type == ETHERTYPE_8021Q9100 ||
 189                 length_type == ETHERTYPE_8021Q9200 ||
 190                 length_type == ETHERTYPE_8021QinQ) {
 191                 /*
 192                  * Print VLAN information, and then go back and process
 193                  * the enclosed type field.
 194                  */
 195                 if (caplen < 4) {
 196                         ND_PRINT((ndo, "[|vlan]"));
 197                         return (hdrlen + caplen);
 198                 }
 199                 if (length < 4) {
 200                         ND_PRINT((ndo, "[|vlan]"));
 201                         return (hdrlen + length);
 202                 }
 203                 if (ndo->ndo_eflag) {
 204                         uint16_t tag = EXTRACT_BE_U_2(p);
 205
 206                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 207                 }
 208
 209                 length_type = EXTRACT_BE_U_2(p + 2);
 210                 if (ndo->ndo_eflag && length_type > ETHERMTU)
 211                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
 212                 p += 4;
 213                 length -= 4;
 214                 caplen -= 4;
 215                 hdrlen += 4;
 216                 goto recurse;
 217         } else if (length_type == ETHERTYPE_JUMBO) {
 218                 /*
 219                  * Alteon jumbo frames.
 220                  * See
 221                  *
 222                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 223                  *
 224                  * which indicates that, following the type field,
 225                  * there's an LLC header and payload.
 226                  */
 227                 /* Try to print the LLC-layer header & higher layers */
 228                 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 229                 if (llc_hdrlen < 0) {
 230                         /* packet type not known, print raw packet */
 231                         if (!ndo->ndo_suppress_default_print)
 232                                 ND_DEFAULTPRINT(p, caplen);
 233                         llc_hdrlen = -llc_hdrlen;
 234                 }
 235                 hdrlen += llc_hdrlen;
 236         } else {
 237                 if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) {
 238                         /* type not known, print raw packet */
 239                         if (!ndo->ndo_eflag) {
 240                                 if (print_encap_header != NULL)
 241                                         (*print_encap_header)(ndo, encap_header_arg);
 242                                 ether_hdr_print(ndo, (const u_char *)ep, orig_length);
 243                         }
 244
 245                         if (!ndo->ndo_suppress_default_print)
 246                                 ND_DEFAULTPRINT(p, caplen);
 247                 }
 248         }
 249         return (hdrlen);
 250 }
 251
 252 /*
 253  * This is the top level routine of the printer.  'p' points
 254  * to the ether header of the packet, 'h->len' is the length
 255  * of the packet off the wire, and 'h->caplen' is the number
 256  * of bytes actually captured.
 257  */
 258 u_int
 259 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 260                const u_char *p)
 261 {
 262         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 263 }
 264
 265 /*
 266  * This is the top level routine of the printer.  'p' points
 267  * to the ether header of the packet, 'h->len' is the length
 268  * of the packet off the wire, and 'h->caplen' is the number
 269  * of bytes actually captured.
 270  *
 271  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 272  * before the Ethernet header.
 273  */
 274 u_int
 275 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 276                      const u_char *p)
 277 {
 278         /*
 279          * Fail if we don't have enough data for the Hilscher pseudo-header.
 280          */
 281         if (h->len < 4 || h->caplen < 4) {
 282                 ND_PRINT((ndo, "[|netanalyzer]"));
 283                 return (h->caplen);
 284         }
 285
 286         /* Skip the pseudo-header. */
 287         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 288 }
 289
 290 /*
 291  * This is the top level routine of the printer.  'p' points
 292  * to the ether header of the packet, 'h->len' is the length
 293  * of the packet off the wire, and 'h->caplen' is the number
 294  * of bytes actually captured.
 295  *
 296  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 297  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 298  * before the Ethernet header.
 299  */
 300 u_int
 301 netanalyzer_transparent_if_print(netdissect_options *ndo,
 302                                  const struct pcap_pkthdr *h,
 303                                  const u_char *p)
 304 {
 305         /*
 306          * Fail if we don't have enough data for the Hilscher pseudo-header,
 307          * preamble, and SOF.
 308          */
 309         if (h->len < 12 || h->caplen < 12) {
 310                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 311                 return (h->caplen);
 312         }
 313
 314         /* Skip the pseudo-header, preamble, and SOF. */
 315         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 316 }
 317
 318 /*
 319  * Prints the packet payload, given an Ethernet type code for the payload's
 320  * protocol.
 321  *
 322  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 323  */
 324
 325 int
 326 ethertype_print(netdissect_options *ndo,
 327                 u_short ether_type, const u_char *p,
 328                 u_int length, u_int caplen,
 329                 const struct lladdr_info *src, const struct lladdr_info *dst)
 330 {
 331         switch (ether_type) {
 332
 333         case ETHERTYPE_IP:
 334                 ip_print(ndo, p, length);
 335                 return (1);
 336
 337         case ETHERTYPE_IPV6:
 338                 ip6_print(ndo, p, length);
 339                 return (1);
 340
 341         case ETHERTYPE_ARP:
 342         case ETHERTYPE_REVARP:
 343                 arp_print(ndo, p, length, caplen);
 344                 return (1);
 345
 346         case ETHERTYPE_DN:
 347                 decnet_print(ndo, p, length, caplen);
 348                 return (1);
 349
 350         case ETHERTYPE_ATALK:
 351                 if (ndo->ndo_vflag)
 352                         ND_PRINT((ndo, "et1 "));
 353                 atalk_print(ndo, p, length);
 354                 return (1);
 355
 356         case ETHERTYPE_AARP:
 357                 aarp_print(ndo, p, length);
 358                 return (1);
 359
 360         case ETHERTYPE_IPX:
 361                 ND_PRINT((ndo, "(NOV-ETHII) "));
 362                 ipx_print(ndo, p, length);
 363                 return (1);
 364
 365         case ETHERTYPE_ISO:
 366                 if (length == 0 || caplen == 0) {
 367                         ND_PRINT((ndo, " [|osi]"));
 368                         return (1);
 369                 }
 370                 isoclns_print(ndo, p + 1, length - 1);
 371                 return(1);
 372
 373         case ETHERTYPE_PPPOED:
 374         case ETHERTYPE_PPPOES:
 375         case ETHERTYPE_PPPOED2:
 376         case ETHERTYPE_PPPOES2:
 377                 pppoe_print(ndo, p, length);
 378                 return (1);
 379
 380         case ETHERTYPE_EAPOL:
 381                 eap_print(ndo, p, length);
 382                 return (1);
 383
 384         case ETHERTYPE_RRCP:
 385                 rrcp_print(ndo, p, length, src, dst);
 386                 return (1);
 387
 388         case ETHERTYPE_PPP:
 389                 if (length) {
 390                         ND_PRINT((ndo, ": "));
 391                         ppp_print(ndo, p, length);
 392                 }
 393                 return (1);
 394
 395         case ETHERTYPE_MPCP:
 396                 mpcp_print(ndo, p, length);
 397                 return (1);
 398
 399         case ETHERTYPE_SLOW:
 400                 slow_print(ndo, p, length);
 401                 return (1);
 402
 403         case ETHERTYPE_CFM:
 404         case ETHERTYPE_CFM_OLD:
 405                 cfm_print(ndo, p, length);
 406                 return (1);
 407
 408         case ETHERTYPE_LLDP:
 409                 lldp_print(ndo, p, length);
 410                 return (1);
 411
 412         case ETHERTYPE_NSH:
 413                 nsh_print(ndo, p, length);
 414                 return (1);
 415
 416         case ETHERTYPE_LOOPBACK:
 417                 loopback_print(ndo, p, length);
 418                 return (1);
 419
 420         case ETHERTYPE_MPLS:
 421         case ETHERTYPE_MPLS_MULTI:
 422                 mpls_print(ndo, p, length);
 423                 return (1);
 424
 425         case ETHERTYPE_TIPC:
 426                 tipc_print(ndo, p, length, caplen);
 427                 return (1);
 428
 429         case ETHERTYPE_MS_NLB_HB:
 430                 msnlb_print(ndo, p);
 431                 return (1);
 432
 433         case ETHERTYPE_GEONET_OLD:
 434         case ETHERTYPE_GEONET:
 435                 geonet_print(ndo, p, length, src);
 436                 return (1);
 437
 438         case ETHERTYPE_CALM_FAST:
 439                 calm_fast_print(ndo, p, length, src);
 440                 return (1);
 441
 442         case ETHERTYPE_AOE:
 443                 aoe_print(ndo, p, length);
 444                 return (1);
 445
 446         case ETHERTYPE_MEDSA:
 447                 medsa_print(ndo, p, length, caplen, src, dst);
 448                 return (1);
 449
 450         case ETHERTYPE_LAT:
 451         case ETHERTYPE_SCA:
 452         case ETHERTYPE_MOPRC:
 453         case ETHERTYPE_MOPDL:
 454         case ETHERTYPE_IEEE1905_1:
 455                 /* default_print for now */
 456         default:
 457                 return (0);
 458         }
 459 }
 460
 461
 462 /*
 463  * Local Variables:
 464  * c-style: whitesmith
 465  * c-basic-offset: 8
 466  * End:
 467  */
 468