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 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <netdissect-stdinc.h>
  27
  28 #include "netdissect.h"
  29 #include "extract.h"
  30 #include "addrtoname.h"
  31 #include "ethertype.h"
  32 #include "ether.h"
  33
  34 const struct tok ethertype_values[] = {
  35     { ETHERTYPE_IP,             "IPv4" },
  36     { ETHERTYPE_MPLS,           "MPLS unicast" },
  37     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  38     { ETHERTYPE_IPV6,           "IPv6" },
  39     { ETHERTYPE_8021Q,          "802.1Q" },
  40     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  41     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  42     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  43     { ETHERTYPE_VMAN,           "VMAN" },
  44     { ETHERTYPE_PUP,            "PUP" },
  45     { ETHERTYPE_ARP,            "ARP"},
  46     { ETHERTYPE_REVARP,         "Reverse ARP"},
  47     { ETHERTYPE_NS,             "NS" },
  48     { ETHERTYPE_SPRITE,         "Sprite" },
  49     { ETHERTYPE_TRAIL,          "Trail" },
  50     { ETHERTYPE_MOPDL,          "MOP DL" },
  51     { ETHERTYPE_MOPRC,          "MOP RC" },
  52     { ETHERTYPE_DN,             "DN" },
  53     { ETHERTYPE_LAT,            "LAT" },
  54     { ETHERTYPE_SCA,            "SCA" },
  55     { ETHERTYPE_TEB,            "TEB" },
  56     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  57     { ETHERTYPE_DECDNS,         "DEC DNS" },
  58     { ETHERTYPE_DECDTS,         "DEC DTS" },
  59     { ETHERTYPE_VEXP,           "VEXP" },
  60     { ETHERTYPE_VPROD,          "VPROD" },
  61     { ETHERTYPE_ATALK,          "Appletalk" },
  62     { ETHERTYPE_AARP,           "Appletalk ARP" },
  63     { ETHERTYPE_IPX,            "IPX" },
  64     { ETHERTYPE_PPP,            "PPP" },
  65     { ETHERTYPE_MPCP,           "MPCP" },
  66     { ETHERTYPE_SLOW,           "Slow Protocols" },
  67     { ETHERTYPE_PPPOED,         "PPPoE D" },
  68     { ETHERTYPE_PPPOES,         "PPPoE S" },
  69     { ETHERTYPE_EAPOL,          "EAPOL" },
  70     { ETHERTYPE_RRCP,           "RRCP" },
  71     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  72     { ETHERTYPE_JUMBO,          "Jumbo" },
  73     { ETHERTYPE_LOOPBACK,       "Loopback" },
  74     { ETHERTYPE_ISO,            "OSI" },
  75     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  76     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  77     { ETHERTYPE_CFM,            "CFM" },
  78     { ETHERTYPE_IEEE1905_1,     "IEEE1905.1" },
  79     { ETHERTYPE_LLDP,           "LLDP" },
  80     { ETHERTYPE_TIPC,           "TIPC"},
  81     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
  82     { ETHERTYPE_GEONET,         "GeoNet"},
  83     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
  84     { ETHERTYPE_AOE,            "AoE" },
  85     { ETHERTYPE_MEDSA,          "MEDSA" },
  86     { 0, NULL}
  87 };
  88
  89 static inline void
  90 ether_hdr_print(netdissect_options *ndo,
  91                 const u_char *bp, u_int length)
  92 {
  93         register const struct ether_header *ep;
  94         uint16_t length_type;
  95
  96         ep = (const struct ether_header *)bp;
  97
  98         ND_PRINT((ndo, "%s > %s",
  99                      etheraddr_string(ndo, ESRC(ep)),
 100                      etheraddr_string(ndo, EDST(ep))));
 101
 102         length_type = EXTRACT_16BITS(&ep->ether_length_type);
 103         if (!ndo->ndo_qflag) {
 104                 if (length_type <= ETHERMTU) {
 105                         ND_PRINT((ndo, ", 802.3"));
 106                         length = length_type;
 107                 } else
 108                         ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 109                                        tok2str(ethertype_values,"Unknown", length_type),
 110                                        length_type));
 111         } else {
 112                 if (length_type <= ETHERMTU) {
 113                         ND_PRINT((ndo, ", 802.3"));
 114                         length = length_type;
 115                 } else
 116                         ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)));
 117         }
 118
 119         ND_PRINT((ndo, ", length %u: ", length));
 120 }
 121
 122 /*
 123  * Print an Ethernet frame.
 124  * This might be encapsulated within another frame; we might be passed
 125  * a pointer to a function that can print header information for that
 126  * frame's protocol, and an argument to pass to that function.
 127  */
 128 u_int
 129 ether_print(netdissect_options *ndo,
 130             const u_char *p, u_int length, u_int caplen,
 131             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 132 {
 133         const struct ether_header *ep;
 134         u_int orig_length;
 135         u_short length_type;
 136         u_int hdrlen;
 137         int llc_hdrlen;
 138
 139         if (caplen < ETHER_HDRLEN) {
 140                 ND_PRINT((ndo, "[|ether]"));
 141                 return (caplen);
 142         }
 143         if (length < ETHER_HDRLEN) {
 144                 ND_PRINT((ndo, "[|ether]"));
 145                 return (length);
 146         }
 147
 148         if (ndo->ndo_eflag) {
 149                 if (print_encap_header != NULL)
 150                         (*print_encap_header)(ndo, encap_header_arg);
 151                 ether_hdr_print(ndo, p, length);
 152         }
 153         orig_length = length;
 154
 155         length -= ETHER_HDRLEN;
 156         caplen -= ETHER_HDRLEN;
 157         ep = (const struct ether_header *)p;
 158         p += ETHER_HDRLEN;
 159         hdrlen = ETHER_HDRLEN;
 160
 161         length_type = EXTRACT_16BITS(&ep->ether_length_type);
 162
 163 recurse:
 164         /*
 165          * Is it (gag) an 802.3 encapsulation?
 166          */
 167         if (length_type <= ETHERMTU) {
 168                 /* Try to print the LLC-layer header & higher layers */
 169                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 170                 if (llc_hdrlen < 0) {
 171                         /* packet type not known, print raw packet */
 172                         if (!ndo->ndo_suppress_default_print)
 173                                 ND_DEFAULTPRINT(p, caplen);
 174                         llc_hdrlen = -llc_hdrlen;
 175                 }
 176                 hdrlen += llc_hdrlen;
 177         } else if (length_type == ETHERTYPE_8021Q  ||
 178                 length_type == ETHERTYPE_8021Q9100 ||
 179                 length_type == ETHERTYPE_8021Q9200 ||
 180                 length_type == ETHERTYPE_8021QinQ) {
 181                 /*
 182                  * Print VLAN information, and then go back and process
 183                  * the enclosed type field.
 184                  */
 185                 if (caplen < 4) {
 186                         ND_PRINT((ndo, "[|vlan]"));
 187                         return (hdrlen + caplen);
 188                 }
 189                 if (length < 4) {
 190                         ND_PRINT((ndo, "[|vlan]"));
 191                         return (hdrlen + length);
 192                 }
 193                 if (ndo->ndo_eflag) {
 194                         uint16_t tag = EXTRACT_16BITS(p);
 195
 196                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 197                 }
 198
 199                 length_type = EXTRACT_16BITS(p + 2);
 200                 if (ndo->ndo_eflag && length_type > ETHERMTU)
 201                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
 202                 p += 4;
 203                 length -= 4;
 204                 caplen -= 4;
 205                 hdrlen += 4;
 206                 goto recurse;
 207         } else if (length_type == ETHERTYPE_JUMBO) {
 208                 /*
 209                  * Alteon jumbo frames.
 210                  * See
 211                  *
 212                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 213                  *
 214                  * which indicates that, following the type field,
 215                  * there's an LLC header and payload.
 216                  */
 217                 /* Try to print the LLC-layer header & higher layers */
 218                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 219                 if (llc_hdrlen < 0) {
 220                         /* packet type not known, print raw packet */
 221                         if (!ndo->ndo_suppress_default_print)
 222                                 ND_DEFAULTPRINT(p, caplen);
 223                         llc_hdrlen = -llc_hdrlen;
 224                 }
 225                 hdrlen += llc_hdrlen;
 226         } else {
 227                 if (ethertype_print(ndo, length_type, p, length, caplen) == 0) {
 228                         /* type not known, print raw packet */
 229                         if (!ndo->ndo_eflag) {
 230                                 if (print_encap_header != NULL)
 231                                         (*print_encap_header)(ndo, encap_header_arg);
 232                                 ether_hdr_print(ndo, (const u_char *)ep, orig_length);
 233                         }
 234
 235                         if (!ndo->ndo_suppress_default_print)
 236                                 ND_DEFAULTPRINT(p, caplen);
 237                 }
 238         }
 239         return (hdrlen);
 240 }
 241
 242 /*
 243  * This is the top level routine of the printer.  'p' points
 244  * to the ether header of the packet, 'h->len' is the length
 245  * of the packet off the wire, and 'h->caplen' is the number
 246  * of bytes actually captured.
 247  */
 248 u_int
 249 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 250                const u_char *p)
 251 {
 252         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 253 }
 254
 255 /*
 256  * This is the top level routine of the printer.  'p' points
 257  * to the ether header of the packet, 'h->len' is the length
 258  * of the packet off the wire, and 'h->caplen' is the number
 259  * of bytes actually captured.
 260  *
 261  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 262  * before the Ethernet header.
 263  */
 264 u_int
 265 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 266                      const u_char *p)
 267 {
 268         /*
 269          * Fail if we don't have enough data for the Hilscher pseudo-header.
 270          */
 271         if (h->len < 4 || h->caplen < 4) {
 272                 ND_PRINT((ndo, "[|netanalyzer]"));
 273                 return (h->caplen);
 274         }
 275
 276         /* Skip the pseudo-header. */
 277         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 278 }
 279
 280 /*
 281  * This is the top level routine of the printer.  'p' points
 282  * to the ether header of the packet, 'h->len' is the length
 283  * of the packet off the wire, and 'h->caplen' is the number
 284  * of bytes actually captured.
 285  *
 286  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 287  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 288  * before the Ethernet header.
 289  */
 290 u_int
 291 netanalyzer_transparent_if_print(netdissect_options *ndo,
 292                                  const struct pcap_pkthdr *h,
 293                                  const u_char *p)
 294 {
 295         /*
 296          * Fail if we don't have enough data for the Hilscher pseudo-header,
 297          * preamble, and SOF.
 298          */
 299         if (h->len < 12 || h->caplen < 12) {
 300                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 301                 return (h->caplen);
 302         }
 303
 304         /* Skip the pseudo-header, preamble, and SOF. */
 305         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 306 }
 307
 308 /*
 309  * Prints the packet payload, given an Ethernet type code for the payload's
 310  * protocol.
 311  *
 312  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 313  */
 314
 315 int
 316 ethertype_print(netdissect_options *ndo,
 317                 u_short ether_type, const u_char *p,
 318                 u_int length, u_int caplen)
 319 {
 320         switch (ether_type) {
 321
 322         case ETHERTYPE_IP:
 323                 ip_print(ndo, p, length);
 324                 return (1);
 325
 326         case ETHERTYPE_IPV6:
 327                 ip6_print(ndo, p, length);
 328                 return (1);
 329
 330         case ETHERTYPE_ARP:
 331         case ETHERTYPE_REVARP:
 332                 arp_print(ndo, p, length, caplen);
 333                 return (1);
 334
 335         case ETHERTYPE_DN:
 336                 decnet_print(ndo, p, length, caplen);
 337                 return (1);
 338
 339         case ETHERTYPE_ATALK:
 340                 if (ndo->ndo_vflag)
 341                         ND_PRINT((ndo, "et1 "));
 342                 atalk_print(ndo, p, length);
 343                 return (1);
 344
 345         case ETHERTYPE_AARP:
 346                 aarp_print(ndo, p, length);
 347                 return (1);
 348
 349         case ETHERTYPE_IPX:
 350                 ND_PRINT((ndo, "(NOV-ETHII) "));
 351                 ipx_print(ndo, p, length);
 352                 return (1);
 353
 354         case ETHERTYPE_ISO:
 355                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 356                 return(1);
 357
 358         case ETHERTYPE_PPPOED:
 359         case ETHERTYPE_PPPOES:
 360         case ETHERTYPE_PPPOED2:
 361         case ETHERTYPE_PPPOES2:
 362                 pppoe_print(ndo, p, length);
 363                 return (1);
 364
 365         case ETHERTYPE_EAPOL:
 366                 eap_print(ndo, p, length);
 367                 return (1);
 368
 369         case ETHERTYPE_RRCP:
 370                 rrcp_print(ndo, p - 14 , length + 14);
 371                 return (1);
 372
 373         case ETHERTYPE_PPP:
 374                 if (length) {
 375                         ND_PRINT((ndo, ": "));
 376                         ppp_print(ndo, p, length);
 377                 }
 378                 return (1);
 379
 380         case ETHERTYPE_MPCP:
 381                 mpcp_print(ndo, p, length);
 382                 return (1);
 383
 384         case ETHERTYPE_SLOW:
 385                 slow_print(ndo, p, length);
 386                 return (1);
 387
 388         case ETHERTYPE_CFM:
 389         case ETHERTYPE_CFM_OLD:
 390                 cfm_print(ndo, p, length);
 391                 return (1);
 392
 393         case ETHERTYPE_LLDP:
 394                 lldp_print(ndo, p, length);
 395                 return (1);
 396
 397         case ETHERTYPE_LOOPBACK:
 398                 loopback_print(ndo, p, length);
 399                 return (1);
 400
 401         case ETHERTYPE_MPLS:
 402         case ETHERTYPE_MPLS_MULTI:
 403                 mpls_print(ndo, p, length);
 404                 return (1);
 405
 406         case ETHERTYPE_TIPC:
 407                 tipc_print(ndo, p, length, caplen);
 408                 return (1);
 409
 410         case ETHERTYPE_MS_NLB_HB:
 411                 msnlb_print(ndo, p);
 412                 return (1);
 413
 414         case ETHERTYPE_GEONET_OLD:
 415         case ETHERTYPE_GEONET:
 416                 geonet_print(ndo, p-14, p, length);
 417                 return (1);
 418
 419         case ETHERTYPE_CALM_FAST:
 420                 calm_fast_print(ndo, p-14, p, length);
 421                 return (1);
 422
 423         case ETHERTYPE_AOE:
 424                 aoe_print(ndo, p, length);
 425                 return (1);
 426
 427         case ETHERTYPE_MEDSA:
 428                 medsa_print(ndo, p, length, caplen);
 429                 return (1);
 430
 431         case ETHERTYPE_LAT:
 432         case ETHERTYPE_SCA:
 433         case ETHERTYPE_MOPRC:
 434         case ETHERTYPE_MOPDL:
 435         case ETHERTYPE_IEEE1905_1:
 436                 /* default_print for now */
 437         default:
 438                 return (0);
 439         }
 440 }
 441
 442
 443 /*
 444  * Local Variables:
 445  * c-style: whitesmith
 446  * c-basic-offset: 8
 447  * End:
 448  */
 449