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 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include "interface.h"
  30 #include "extract.h"
  31 #include "addrtoname.h"
  32 #include "ethertype.h"
  33 #include "ether.h"
  34
  35 const struct tok ethertype_values[] = {
  36     { ETHERTYPE_IP,             "IPv4" },
  37     { ETHERTYPE_MPLS,           "MPLS unicast" },
  38     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  39     { ETHERTYPE_IPV6,           "IPv6" },
  40     { ETHERTYPE_8021Q,          "802.1Q" },
  41     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  42     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  43     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  44     { ETHERTYPE_VMAN,           "VMAN" },
  45     { ETHERTYPE_PUP,            "PUP" },
  46     { ETHERTYPE_ARP,            "ARP"},
  47     { ETHERTYPE_REVARP,         "Reverse ARP"},
  48     { ETHERTYPE_NS,             "NS" },
  49     { ETHERTYPE_SPRITE,         "Sprite" },
  50     { ETHERTYPE_TRAIL,          "Trail" },
  51     { ETHERTYPE_MOPDL,          "MOP DL" },
  52     { ETHERTYPE_MOPRC,          "MOP RC" },
  53     { ETHERTYPE_DN,             "DN" },
  54     { ETHERTYPE_LAT,            "LAT" },
  55     { ETHERTYPE_SCA,            "SCA" },
  56     { ETHERTYPE_TEB,            "TEB" },
  57     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  58     { ETHERTYPE_DECDNS,         "DEC DNS" },
  59     { ETHERTYPE_DECDTS,         "DEC DTS" },
  60     { ETHERTYPE_VEXP,           "VEXP" },
  61     { ETHERTYPE_VPROD,          "VPROD" },
  62     { ETHERTYPE_ATALK,          "Appletalk" },
  63     { ETHERTYPE_AARP,           "Appletalk ARP" },
  64     { ETHERTYPE_IPX,            "IPX" },
  65     { ETHERTYPE_PPP,            "PPP" },
  66     { ETHERTYPE_MPCP,           "MPCP" },
  67     { ETHERTYPE_SLOW,           "Slow Protocols" },
  68     { ETHERTYPE_PPPOED,         "PPPoE D" },
  69     { ETHERTYPE_PPPOES,         "PPPoE S" },
  70     { ETHERTYPE_EAPOL,          "EAPOL" },
  71     { ETHERTYPE_RRCP,           "RRCP" },
  72     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  73     { ETHERTYPE_JUMBO,          "Jumbo" },
  74     { ETHERTYPE_LOOPBACK,       "Loopback" },
  75     { ETHERTYPE_ISO,            "OSI" },
  76     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  77     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  78     { ETHERTYPE_CFM,            "CFM" },
  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     { 0, NULL}
  85 };
  86
  87 static inline void
  88 ether_hdr_print(netdissect_options *ndo,
  89                 const u_char *bp, u_int length)
  90 {
  91         register const struct ether_header *ep;
  92         u_int16_t ether_type;
  93
  94         ep = (const struct ether_header *)bp;
  95
  96         ND_PRINT((ndo, "%s > %s",
  97                      etheraddr_string(ESRC(ep)),
  98                      etheraddr_string(EDST(ep))));
  99
 100         ether_type = EXTRACT_16BITS(&ep->ether_type);
 101         if (!ndo->ndo_qflag) {
 102                 if (ether_type <= ETHERMTU)
 103                           ND_PRINT((ndo, ", 802.3"));
 104                 else
 105                           ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 106                                        tok2str(ethertype_values,"Unknown", ether_type),
 107                                        ether_type));
 108         } else {
 109                 if (ether_type <= ETHERMTU)
 110                           ND_PRINT((ndo, ", 802.3"));
 111                 else
 112                           ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 113         }
 114
 115         ND_PRINT((ndo, ", length %u: ", length));
 116 }
 117
 118 /*
 119  * Print an Ethernet frame.
 120  * This might be encapsulated within another frame; we might be passed
 121  * a pointer to a function that can print header information for that
 122  * frame's protocol, and an argument to pass to that function.
 123  */
 124 void
 125 ether_print(netdissect_options *ndo,
 126             const u_char *p, u_int length, u_int caplen,
 127             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 128 {
 129         struct ether_header *ep;
 130         u_int orig_length;
 131         u_short ether_type;
 132         u_short extracted_ether_type;
 133
 134         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 135                 ND_PRINT((ndo, "[|ether]"));
 136                 return;
 137         }
 138
 139         if (ndo->ndo_eflag) {
 140                 if (print_encap_header != NULL)
 141                         (*print_encap_header)(ndo, encap_header_arg);
 142                 ether_hdr_print(ndo, p, length);
 143         }
 144         orig_length = length;
 145
 146         length -= ETHER_HDRLEN;
 147         caplen -= ETHER_HDRLEN;
 148         ep = (struct ether_header *)p;
 149         p += ETHER_HDRLEN;
 150
 151         ether_type = EXTRACT_16BITS(&ep->ether_type);
 152
 153 recurse:
 154         /*
 155          * Is it (gag) an 802.3 encapsulation?
 156          */
 157         if (ether_type <= ETHERMTU) {
 158                 /* Try to print the LLC-layer header & higher layers */
 159                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 160                     &extracted_ether_type) == 0) {
 161                         /* ether_type not known, print raw packet */
 162                         if (!ndo->ndo_eflag) {
 163                                 if (print_encap_header != NULL)
 164                                         (*print_encap_header)(ndo, encap_header_arg);
 165                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 166                         }
 167
 168                         if (!ndo->ndo_suppress_default_print)
 169                                 ND_DEFAULTPRINT(p, caplen);
 170                 }
 171         } else if (ether_type == ETHERTYPE_8021Q  ||
 172                 ether_type == ETHERTYPE_8021Q9100 ||
 173                 ether_type == ETHERTYPE_8021Q9200 ||
 174                 ether_type == ETHERTYPE_8021QinQ) {
 175                 /*
 176                  * Print VLAN information, and then go back and process
 177                  * the enclosed type field.
 178                  */
 179                 if (caplen < 4 || length < 4) {
 180                         ND_PRINT((ndo, "[|vlan]"));
 181                         return;
 182                 }
 183                 if (ndo->ndo_eflag) {
 184                         u_int16_t tag = EXTRACT_16BITS(p);
 185
 186                         ND_PRINT((ndo, "vlan %u, p %u%s, ",
 187                             tag & 0xfff,
 188                             tag >> 13,
 189                             (tag & 0x1000) ? ", CFI" : ""));
 190                 }
 191
 192                 ether_type = EXTRACT_16BITS(p + 2);
 193                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 194                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 195                 p += 4;
 196                 length -= 4;
 197                 caplen -= 4;
 198                 goto recurse;
 199         } else if (ether_type == ETHERTYPE_JUMBO) {
 200                 /*
 201                  * Alteon jumbo frames.
 202                  * See
 203                  *
 204                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 205                  *
 206                  * which indicates that, following the type field,
 207                  * there's an LLC header and payload.
 208                  */
 209                 /* Try to print the LLC-layer header & higher layers */
 210                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 211                     &extracted_ether_type) == 0) {
 212                         /* ether_type not known, print raw packet */
 213                         if (!ndo->ndo_eflag) {
 214                                 if (print_encap_header != NULL)
 215                                         (*print_encap_header)(ndo, encap_header_arg);
 216                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 217                         }
 218
 219                         if (!ndo->ndo_suppress_default_print)
 220                                 ND_DEFAULTPRINT(p, caplen);
 221                 }
 222         } else {
 223                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 224                         /* ether_type not known, print raw packet */
 225                         if (!ndo->ndo_eflag) {
 226                                 if (print_encap_header != NULL)
 227                                         (*print_encap_header)(ndo, encap_header_arg);
 228                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 229                         }
 230
 231                         if (!ndo->ndo_suppress_default_print)
 232                                 ND_DEFAULTPRINT(p, caplen);
 233                 }
 234         }
 235 }
 236
 237 /*
 238  * This is the top level routine of the printer.  'p' points
 239  * to the ether header of the packet, 'h->ts' is the timestamp,
 240  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 241  * is the number of bytes actually captured.
 242  */
 243 u_int
 244 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 245                const u_char *p)
 246 {
 247         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 248
 249         return (ETHER_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->ts' is the timestamp,
 255  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 256  * is the number of bytes actually captured.
 257  *
 258  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 259  * before the Ethernet header.
 260  */
 261 u_int
 262 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 263                      const u_char *p)
 264 {
 265         /*
 266          * Fail if we don't have enough data for the Hilscher pseudo-header.
 267          */
 268         if (h->len < 4 || h->caplen < 4) {
 269                 ND_PRINT((ndo, "[|netanalyzer]"));
 270                 return (h->caplen);
 271         }
 272
 273         /* Skip the pseudo-header. */
 274         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 275
 276         return (4 + ETHER_HDRLEN);
 277 }
 278
 279 /*
 280  * This is the top level routine of the printer.  'p' points
 281  * to the ether header of the packet, 'h->ts' is the timestamp,
 282  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 283  * is the number of bytes actually captured.
 284  *
 285  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 286  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 287  * before the Ethernet header.
 288  */
 289 u_int
 290 netanalyzer_transparent_if_print(netdissect_options *ndo,
 291                                  const struct pcap_pkthdr *h,
 292                                  const u_char *p)
 293 {
 294         /*
 295          * Fail if we don't have enough data for the Hilscher pseudo-header,
 296          * preamble, and SOF.
 297          */
 298         if (h->len < 12 || h->caplen < 12) {
 299                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 300                 return (h->caplen);
 301         }
 302
 303         /* Skip the pseudo-header, preamble, and SOF. */
 304         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 305
 306         return (12 + ETHER_HDRLEN);
 307 }
 308
 309 /*
 310  * Prints the packet payload, given an Ethernet type code for the payload's
 311  * protocol.
 312  *
 313  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 314  */
 315
 316 int
 317 ethertype_print(netdissect_options *ndo,
 318                 u_short ether_type, const u_char *p,
 319                 u_int length, u_int caplen)
 320 {
 321         switch (ether_type) {
 322
 323         case ETHERTYPE_IP:
 324                 ip_print(ndo, p, length);
 325                 return (1);
 326
 327 #ifdef INET6
 328         case ETHERTYPE_IPV6:
 329                 ip6_print(ndo, p, length);
 330                 return (1);
 331 #endif /*INET6*/
 332
 333         case ETHERTYPE_ARP:
 334         case ETHERTYPE_REVARP:
 335                 arp_print(ndo, p, length, caplen);
 336                 return (1);
 337
 338         case ETHERTYPE_DN:
 339                 decnet_print(/*ndo,*/p, length, caplen);
 340                 return (1);
 341
 342         case ETHERTYPE_ATALK:
 343                 if (ndo->ndo_vflag)
 344                         ND_PRINT((ndo, "et1 "));
 345                 atalk_print(/*ndo,*/p, length);
 346                 return (1);
 347
 348         case ETHERTYPE_AARP:
 349                 aarp_print(/*ndo,*/p, length);
 350                 return (1);
 351
 352         case ETHERTYPE_IPX:
 353                 ND_PRINT((ndo, "(NOV-ETHII) "));
 354                 ipx_print(ndo, p, length);
 355                 return (1);
 356
 357         case ETHERTYPE_ISO:
 358                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 359                 return(1);
 360
 361         case ETHERTYPE_PPPOED:
 362         case ETHERTYPE_PPPOES:
 363         case ETHERTYPE_PPPOED2:
 364         case ETHERTYPE_PPPOES2:
 365                 pppoe_print(ndo, p, length);
 366                 return (1);
 367
 368         case ETHERTYPE_EAPOL:
 369                 eap_print(ndo, p, length);
 370                 return (1);
 371
 372         case ETHERTYPE_RRCP:
 373                 rrcp_print(ndo, p - 14 , length + 14);
 374                 return (1);
 375
 376         case ETHERTYPE_PPP:
 377                 if (length) {
 378                         ND_PRINT((ndo, ": "));
 379                         ppp_print(/*ndo,*/p, length);
 380                 }
 381                 return (1);
 382
 383         case ETHERTYPE_MPCP:
 384                 mpcp_print(ndo, p, length);
 385                 return (1);
 386
 387         case ETHERTYPE_SLOW:
 388                 slow_print(ndo, p, length);
 389                 return (1);
 390
 391         case ETHERTYPE_CFM:
 392         case ETHERTYPE_CFM_OLD:
 393                 cfm_print(/*ndo,*/p, length);
 394                 return (1);
 395
 396         case ETHERTYPE_LLDP:
 397                 lldp_print(/*ndo,*/p, length);
 398                 return (1);
 399
 400         case ETHERTYPE_LOOPBACK:
 401                 loopback_print(ndo, p, length);
 402                 return (1);
 403
 404         case ETHERTYPE_MPLS:
 405         case ETHERTYPE_MPLS_MULTI:
 406                 mpls_print(ndo, p, length);
 407                 return (1);
 408
 409         case ETHERTYPE_TIPC:
 410                 tipc_print(ndo, p, length, caplen);
 411                 return (1);
 412
 413         case ETHERTYPE_MS_NLB_HB:
 414                 msnlb_print(ndo, p);
 415                 return (1);
 416
 417         case ETHERTYPE_GEONET_OLD:
 418         case ETHERTYPE_GEONET:
 419                 geonet_print(ndo, p-14, p, length);
 420                 return (1);
 421
 422         case ETHERTYPE_CALM_FAST:
 423                 calm_fast_print(ndo, p-14, p, length);
 424                 return (1);
 425
 426         case ETHERTYPE_LAT:
 427         case ETHERTYPE_SCA:
 428         case ETHERTYPE_MOPRC:
 429         case ETHERTYPE_MOPDL:
 430                 /* default_print for now */
 431         default:
 432                 return (0);
 433         }
 434 }
 435
 436
 437 /*
 438  * Local Variables:
 439  * c-style: whitesmith
 440  * c-basic-offset: 8
 441  * End:
 442  */
 443