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 <tcpdump-stdinc.h>
  27
  28 #include "interface.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 ether_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         ether_type = EXTRACT_16BITS(&ep->ether_type);
 103         if (!ndo->ndo_qflag) {
 104                 if (ether_type <= ETHERMTU)
 105                           ND_PRINT((ndo, ", 802.3"));
 106                 else
 107                           ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 108                                        tok2str(ethertype_values,"Unknown", ether_type),
 109                                        ether_type));
 110         } else {
 111                 if (ether_type <= ETHERMTU)
 112                           ND_PRINT((ndo, ", 802.3"));
 113                 else
 114                           ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 115         }
 116
 117         ND_PRINT((ndo, ", length %u: ", length));
 118 }
 119
 120 /*
 121  * Print an Ethernet frame.
 122  * This might be encapsulated within another frame; we might be passed
 123  * a pointer to a function that can print header information for that
 124  * frame's protocol, and an argument to pass to that function.
 125  */
 126 u_int
 127 ether_print(netdissect_options *ndo,
 128             const u_char *p, u_int length, u_int caplen,
 129             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 130 {
 131         struct ether_header *ep;
 132         u_int orig_length;
 133         u_short ether_type;
 134         u_int hdrlen;
 135         int llc_hdrlen;
 136
 137         if (caplen < ETHER_HDRLEN) {
 138                 ND_PRINT((ndo, "[|ether]"));
 139                 return (caplen);
 140         }
 141         if (length < ETHER_HDRLEN) {
 142                 ND_PRINT((ndo, "[|ether]"));
 143                 return (length);
 144         }
 145
 146         if (ndo->ndo_eflag) {
 147                 if (print_encap_header != NULL)
 148                         (*print_encap_header)(ndo, encap_header_arg);
 149                 ether_hdr_print(ndo, p, length);
 150         }
 151         orig_length = length;
 152
 153         length -= ETHER_HDRLEN;
 154         caplen -= ETHER_HDRLEN;
 155         ep = (struct ether_header *)p;
 156         p += ETHER_HDRLEN;
 157         hdrlen = ETHER_HDRLEN;
 158
 159         ether_type = EXTRACT_16BITS(&ep->ether_type);
 160
 161 recurse:
 162         /*
 163          * Is it (gag) an 802.3 encapsulation?
 164          */
 165         if (ether_type <= ETHERMTU) {
 166                 /* Try to print the LLC-layer header & higher layers */
 167                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 168                 if (llc_hdrlen < 0) {
 169                         /* packet type not known, print raw packet */
 170                         if (!ndo->ndo_suppress_default_print)
 171                                 ND_DEFAULTPRINT(p, caplen);
 172                         llc_hdrlen = -llc_hdrlen;
 173                 }
 174                 hdrlen += llc_hdrlen;
 175         } else if (ether_type == ETHERTYPE_8021Q  ||
 176                 ether_type == ETHERTYPE_8021Q9100 ||
 177                 ether_type == ETHERTYPE_8021Q9200 ||
 178                 ether_type == ETHERTYPE_8021QinQ) {
 179                 /*
 180                  * Print VLAN information, and then go back and process
 181                  * the enclosed type field.
 182                  */
 183                 if (caplen < 4) {
 184                         ND_PRINT((ndo, "[|vlan]"));
 185                         return (hdrlen + caplen);
 186                 }
 187                 if (length < 4) {
 188                         ND_PRINT((ndo, "[|vlan]"));
 189                         return (hdrlen + length);
 190                 }
 191                 if (ndo->ndo_eflag) {
 192                         uint16_t tag = EXTRACT_16BITS(p);
 193
 194                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 195                 }
 196
 197                 ether_type = EXTRACT_16BITS(p + 2);
 198                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 199                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 200                 p += 4;
 201                 length -= 4;
 202                 caplen -= 4;
 203                 hdrlen += 4;
 204                 goto recurse;
 205         } else if (ether_type == ETHERTYPE_JUMBO) {
 206                 /*
 207                  * Alteon jumbo frames.
 208                  * See
 209                  *
 210                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 211                  *
 212                  * which indicates that, following the type field,
 213                  * there's an LLC header and payload.
 214                  */
 215                 /* Try to print the LLC-layer header & higher layers */
 216                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 217                 if (llc_hdrlen < 0) {
 218                         /* packet type not known, print raw packet */
 219                         if (!ndo->ndo_suppress_default_print)
 220                                 ND_DEFAULTPRINT(p, caplen);
 221                         llc_hdrlen = -llc_hdrlen;
 222                 }
 223                 hdrlen += llc_hdrlen;
 224         } else {
 225                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 226                         /* ether_type not known, print raw packet */
 227                         if (!ndo->ndo_eflag) {
 228                                 if (print_encap_header != NULL)
 229                                         (*print_encap_header)(ndo, encap_header_arg);
 230                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 231                         }
 232
 233                         if (!ndo->ndo_suppress_default_print)
 234                                 ND_DEFAULTPRINT(p, caplen);
 235                 }
 236         }
 237         return (hdrlen);
 238 }
 239
 240 /*
 241  * This is the top level routine of the printer.  'p' points
 242  * to the ether header of the packet, 'h->ts' is the timestamp,
 243  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 244  * is the number of bytes actually captured.
 245  */
 246 u_int
 247 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 248                const u_char *p)
 249 {
 250         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 251 }
 252
 253 /*
 254  * This is the top level routine of the printer.  'p' points
 255  * to the ether header of the packet, 'h->ts' is the timestamp,
 256  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 257  * is the number of bytes actually captured.
 258  *
 259  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 260  * before the Ethernet header.
 261  */
 262 u_int
 263 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 264                      const u_char *p)
 265 {
 266         /*
 267          * Fail if we don't have enough data for the Hilscher pseudo-header.
 268          */
 269         if (h->len < 4 || h->caplen < 4) {
 270                 ND_PRINT((ndo, "[|netanalyzer]"));
 271                 return (h->caplen);
 272         }
 273
 274         /* Skip the pseudo-header. */
 275         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 276 }
 277
 278 /*
 279  * This is the top level routine of the printer.  'p' points
 280  * to the ether header of the packet, 'h->ts' is the timestamp,
 281  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 282  * is the number of bytes actually captured.
 283  *
 284  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 285  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 286  * before the Ethernet header.
 287  */
 288 u_int
 289 netanalyzer_transparent_if_print(netdissect_options *ndo,
 290                                  const struct pcap_pkthdr *h,
 291                                  const u_char *p)
 292 {
 293         /*
 294          * Fail if we don't have enough data for the Hilscher pseudo-header,
 295          * preamble, and SOF.
 296          */
 297         if (h->len < 12 || h->caplen < 12) {
 298                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 299                 return (h->caplen);
 300         }
 301
 302         /* Skip the pseudo-header, preamble, and SOF. */
 303         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 304 }
 305
 306 /*
 307  * Prints the packet payload, given an Ethernet type code for the payload's
 308  * protocol.
 309  *
 310  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 311  */
 312
 313 int
 314 ethertype_print(netdissect_options *ndo,
 315                 u_short ether_type, const u_char *p,
 316                 u_int length, u_int caplen)
 317 {
 318         switch (ether_type) {
 319
 320         case ETHERTYPE_IP:
 321                 ip_print(ndo, p, length);
 322                 return (1);
 323
 324         case ETHERTYPE_IPV6:
 325                 ip6_print(ndo, p, length);
 326                 return (1);
 327
 328         case ETHERTYPE_ARP:
 329         case ETHERTYPE_REVARP:
 330                 arp_print(ndo, p, length, caplen);
 331                 return (1);
 332
 333         case ETHERTYPE_DN:
 334                 decnet_print(ndo, p, length, caplen);
 335                 return (1);
 336
 337         case ETHERTYPE_ATALK:
 338                 if (ndo->ndo_vflag)
 339                         ND_PRINT((ndo, "et1 "));
 340                 atalk_print(ndo, p, length);
 341                 return (1);
 342
 343         case ETHERTYPE_AARP:
 344                 aarp_print(ndo, p, length);
 345                 return (1);
 346
 347         case ETHERTYPE_IPX:
 348                 ND_PRINT((ndo, "(NOV-ETHII) "));
 349                 ipx_print(ndo, p, length);
 350                 return (1);
 351
 352         case ETHERTYPE_ISO:
 353                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 354                 return(1);
 355
 356         case ETHERTYPE_PPPOED:
 357         case ETHERTYPE_PPPOES:
 358         case ETHERTYPE_PPPOED2:
 359         case ETHERTYPE_PPPOES2:
 360                 pppoe_print(ndo, p, length);
 361                 return (1);
 362
 363         case ETHERTYPE_EAPOL:
 364                 eap_print(ndo, p, length);
 365                 return (1);
 366
 367         case ETHERTYPE_RRCP:
 368                 rrcp_print(ndo, p - 14 , length + 14);
 369                 return (1);
 370
 371         case ETHERTYPE_PPP:
 372                 if (length) {
 373                         ND_PRINT((ndo, ": "));
 374                         ppp_print(ndo, p, length);
 375                 }
 376                 return (1);
 377
 378         case ETHERTYPE_MPCP:
 379                 mpcp_print(ndo, p, length);
 380                 return (1);
 381
 382         case ETHERTYPE_SLOW:
 383                 slow_print(ndo, p, length);
 384                 return (1);
 385
 386         case ETHERTYPE_CFM:
 387         case ETHERTYPE_CFM_OLD:
 388                 cfm_print(ndo, p, length);
 389                 return (1);
 390
 391         case ETHERTYPE_LLDP:
 392                 lldp_print(ndo, p, length);
 393                 return (1);
 394
 395         case ETHERTYPE_LOOPBACK:
 396                 loopback_print(ndo, p, length);
 397                 return (1);
 398
 399         case ETHERTYPE_MPLS:
 400         case ETHERTYPE_MPLS_MULTI:
 401                 mpls_print(ndo, p, length);
 402                 return (1);
 403
 404         case ETHERTYPE_TIPC:
 405                 tipc_print(ndo, p, length, caplen);
 406                 return (1);
 407
 408         case ETHERTYPE_MS_NLB_HB:
 409                 msnlb_print(ndo, p);
 410                 return (1);
 411
 412         case ETHERTYPE_GEONET_OLD:
 413         case ETHERTYPE_GEONET:
 414                 geonet_print(ndo, p-14, p, length);
 415                 return (1);
 416
 417         case ETHERTYPE_CALM_FAST:
 418                 calm_fast_print(ndo, p-14, p, length);
 419                 return (1);
 420
 421         case ETHERTYPE_AOE:
 422                 aoe_print(ndo, p, length);
 423                 return (1);
 424
 425         case ETHERTYPE_MEDSA:
 426                 medsa_print(ndo, p, length, caplen);
 427                 return (1);
 428
 429         case ETHERTYPE_LAT:
 430         case ETHERTYPE_SCA:
 431         case ETHERTYPE_MOPRC:
 432         case ETHERTYPE_MOPDL:
 433         case ETHERTYPE_IEEE1905_1:
 434                 /* default_print for now */
 435         default:
 436                 return (0);
 437         }
 438 }
 439
 440
 441 /*
 442  * Local Variables:
 443  * c-style: whitesmith
 444  * c-basic-offset: 8
 445  * End:
 446  */
 447