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 #ifndef lint
  22 static const char rcsid[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp $ (LBL)";
  24 #endif
  25
  26 #define NETDISSECT_REWORKED
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <pcap.h>
  35
  36 #include "interface.h"
  37 #include "extract.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40 #include "ether.h"
  41
  42 const struct tok ethertype_values[] = {
  43     { ETHERTYPE_IP,             "IPv4" },
  44     { ETHERTYPE_MPLS,           "MPLS unicast" },
  45     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  46     { ETHERTYPE_IPV6,           "IPv6" },
  47     { ETHERTYPE_8021Q,          "802.1Q" },
  48     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  49     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  50     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  51     { ETHERTYPE_VMAN,           "VMAN" },
  52     { ETHERTYPE_PUP,            "PUP" },
  53     { ETHERTYPE_ARP,            "ARP"},
  54     { ETHERTYPE_REVARP,         "Reverse ARP"},
  55     { ETHERTYPE_NS,             "NS" },
  56     { ETHERTYPE_SPRITE,         "Sprite" },
  57     { ETHERTYPE_TRAIL,          "Trail" },
  58     { ETHERTYPE_MOPDL,          "MOP DL" },
  59     { ETHERTYPE_MOPRC,          "MOP RC" },
  60     { ETHERTYPE_DN,             "DN" },
  61     { ETHERTYPE_LAT,            "LAT" },
  62     { ETHERTYPE_SCA,            "SCA" },
  63     { ETHERTYPE_TEB,            "TEB" },
  64     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  65     { ETHERTYPE_DECDNS,         "DEC DNS" },
  66     { ETHERTYPE_DECDTS,         "DEC DTS" },
  67     { ETHERTYPE_VEXP,           "VEXP" },
  68     { ETHERTYPE_VPROD,          "VPROD" },
  69     { ETHERTYPE_ATALK,          "Appletalk" },
  70     { ETHERTYPE_AARP,           "Appletalk ARP" },
  71     { ETHERTYPE_IPX,            "IPX" },
  72     { ETHERTYPE_PPP,            "PPP" },
  73     { ETHERTYPE_MPCP,           "MPCP" },
  74     { ETHERTYPE_SLOW,           "Slow Protocols" },
  75     { ETHERTYPE_PPPOED,         "PPPoE D" },
  76     { ETHERTYPE_PPPOES,         "PPPoE S" },
  77     { ETHERTYPE_EAPOL,          "EAPOL" },
  78     { ETHERTYPE_RRCP,           "RRCP" },
  79     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  80     { ETHERTYPE_JUMBO,          "Jumbo" },
  81     { ETHERTYPE_LOOPBACK,       "Loopback" },
  82     { ETHERTYPE_ISO,            "OSI" },
  83     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  84     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  85     { ETHERTYPE_CFM,            "CFM" },
  86     { ETHERTYPE_LLDP,           "LLDP" },
  87     { ETHERTYPE_TIPC,           "TIPC"},
  88     { 0, NULL}
  89 };
  90
  91 static inline void
  92 ether_hdr_print(netdissect_options *ndo,
  93                 const u_char *bp, u_int length)
  94 {
  95         register const struct ether_header *ep;
  96         u_int16_t ether_type;
  97
  98         ep = (const struct ether_header *)bp;
  99
 100         (void)ND_PRINT((ndo, "%s > %s",
 101                      etheraddr_string(ESRC(ep)),
 102                      etheraddr_string(EDST(ep))));
 103
 104         ether_type = EXTRACT_16BITS(&ep->ether_type);
 105         if (!ndo->ndo_qflag) {
 106                 if (ether_type <= ETHERMTU)
 107                           (void)ND_PRINT((ndo, ", 802.3"));
 108                 else
 109                           (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 110                                        tok2str(ethertype_values,"Unknown", ether_type),
 111                                        ether_type));
 112         } else {
 113                 if (ether_type <= ETHERMTU)
 114                           (void)ND_PRINT((ndo, ", 802.3"));
 115                 else
 116                           (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 117         }
 118
 119         (void)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 void
 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         struct ether_header *ep;
 134         u_int orig_length;
 135         u_short ether_type;
 136         u_short extracted_ether_type;
 137
 138         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 139                 ND_PRINT((ndo, "[|ether]"));
 140                 return;
 141         }
 142
 143         if (ndo->ndo_eflag) {
 144                 if (print_encap_header != NULL)
 145                         (*print_encap_header)(ndo, encap_header_arg);
 146                 ether_hdr_print(ndo, p, length);
 147         }
 148         orig_length = length;
 149
 150         length -= ETHER_HDRLEN;
 151         caplen -= ETHER_HDRLEN;
 152         ep = (struct ether_header *)p;
 153         p += ETHER_HDRLEN;
 154
 155         ether_type = EXTRACT_16BITS(&ep->ether_type);
 156
 157 recurse:
 158         /*
 159          * Is it (gag) an 802.3 encapsulation?
 160          */
 161         if (ether_type <= ETHERMTU) {
 162                 /* Try to print the LLC-layer header & higher layers */
 163                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 164                     &extracted_ether_type) == 0) {
 165                         /* ether_type not known, print raw packet */
 166                         if (!ndo->ndo_eflag) {
 167                                 if (print_encap_header != NULL)
 168                                         (*print_encap_header)(ndo, encap_header_arg);
 169                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 170                         }
 171
 172                         if (!ndo->ndo_suppress_default_print)
 173                                 ndo->ndo_default_print(ndo, p, caplen);
 174                 }
 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 || length < 4) {
 184                         ND_PRINT((ndo, "[|vlan]"));
 185                         return;
 186                 }
 187                 if (ndo->ndo_eflag) {
 188                         u_int16_t tag = EXTRACT_16BITS(p);
 189
 190                         ND_PRINT((ndo, "vlan %u, p %u%s, ",
 191                             tag & 0xfff,
 192                             tag >> 13,
 193                             (tag & 0x1000) ? ", CFI" : ""));
 194                 }
 195
 196                 ether_type = EXTRACT_16BITS(p + 2);
 197                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 198                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 199                 p += 4;
 200                 length -= 4;
 201                 caplen -= 4;
 202                 goto recurse;
 203         } else if (ether_type == ETHERTYPE_JUMBO) {
 204                 /*
 205                  * Alteon jumbo frames.
 206                  * See
 207                  *
 208                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 209                  *
 210                  * which indicates that, following the type field,
 211                  * there's an LLC header and payload.
 212                  */
 213                 /* Try to print the LLC-layer header & higher layers */
 214                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 215                     &extracted_ether_type) == 0) {
 216                         /* ether_type not known, print raw packet */
 217                         if (!ndo->ndo_eflag) {
 218                                 if (print_encap_header != NULL)
 219                                         (*print_encap_header)(ndo, encap_header_arg);
 220                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 221                         }
 222
 223                         if (!ndo->ndo_suppress_default_print)
 224                                 ndo->ndo_default_print(ndo, p, caplen);
 225                 }
 226         } else {
 227                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 228                         /* ether_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, (u_char *)ep, orig_length);
 233                         }
 234
 235                         if (!ndo->ndo_suppress_default_print)
 236                                 ndo->ndo_default_print(ndo, p, caplen);
 237                 }
 238         }
 239 }
 240
 241 /*
 242  * This is the top level routine of the printer.  'p' points
 243  * to the ether header of the packet, 'h->ts' is the timestamp,
 244  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 245  * is the number of bytes actually captured.
 246  */
 247 u_int
 248 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 249                const u_char *p)
 250 {
 251         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 252
 253         return (ETHER_HDRLEN);
 254 }
 255
 256 /*
 257  * This is the top level routine of the printer.  'p' points
 258  * to the ether header of the packet, 'h->ts' is the timestamp,
 259  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 260  * is the number of bytes actually captured.
 261  *
 262  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 263  * before the Ethernet header.
 264  */
 265 u_int
 266 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 267                      const u_char *p)
 268 {
 269         /*
 270          * Fail if we don't have enough data for the Hilscher pseudo-header.
 271          */
 272         if (h->len < 4 || h->caplen < 4) {
 273                 printf("[|netanalyzer]");
 274                 return (h->caplen);
 275         }
 276
 277         /* Skip the pseudo-header. */
 278         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 279
 280         return (4 + ETHER_HDRLEN);
 281 }
 282
 283 /*
 284  * This is the top level routine of the printer.  'p' points
 285  * to the ether header of the packet, 'h->ts' is the timestamp,
 286  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 287  * is the number of bytes actually captured.
 288  *
 289  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 290  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 291  * before the Ethernet header.
 292  */
 293 u_int
 294 netanalyzer_transparent_if_print(netdissect_options *ndo,
 295                                  const struct pcap_pkthdr *h,
 296                                  const u_char *p)
 297 {
 298         /*
 299          * Fail if we don't have enough data for the Hilscher pseudo-header,
 300          * preamble, and SOF.
 301          */
 302         if (h->len < 12 || h->caplen < 12) {
 303                 printf("[|netanalyzer-transparent]");
 304                 return (h->caplen);
 305         }
 306
 307         /* Skip the pseudo-header, preamble, and SOF. */
 308         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 309
 310         return (12 + ETHER_HDRLEN);
 311 }
 312
 313 /*
 314  * Prints the packet payload, given an Ethernet type code for the payload's
 315  * protocol.
 316  *
 317  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 318  */
 319
 320 int
 321 ethertype_print(netdissect_options *ndo,
 322                 u_short ether_type, const u_char *p,
 323                 u_int length, u_int caplen)
 324 {
 325         switch (ether_type) {
 326
 327         case ETHERTYPE_IP:
 328                 ip_print(ndo, p, length);
 329                 return (1);
 330
 331 #ifdef INET6
 332         case ETHERTYPE_IPV6:
 333                 ip6_print(ndo, p, length);
 334                 return (1);
 335 #endif /*INET6*/
 336
 337         case ETHERTYPE_ARP:
 338         case ETHERTYPE_REVARP:
 339                 arp_print(ndo, p, length, caplen);
 340                 return (1);
 341
 342         case ETHERTYPE_DN:
 343                 decnet_print(/*ndo,*/p, length, caplen);
 344                 return (1);
 345
 346         case ETHERTYPE_ATALK:
 347                 if (ndo->ndo_vflag)
 348                         fputs("et1 ", stdout);
 349                 atalk_print(/*ndo,*/p, length);
 350                 return (1);
 351
 352         case ETHERTYPE_AARP:
 353                 aarp_print(/*ndo,*/p, length);
 354                 return (1);
 355
 356         case ETHERTYPE_IPX:
 357                 ND_PRINT((ndo, "(NOV-ETHII) "));
 358                 ipx_print(/*ndo,*/p, length);
 359                 return (1);
 360
 361         case ETHERTYPE_ISO:
 362                 isoclns_print(/*ndo,*/p+1, length-1, length-1);
 363                 return(1);
 364
 365         case ETHERTYPE_PPPOED:
 366         case ETHERTYPE_PPPOES:
 367         case ETHERTYPE_PPPOED2:
 368         case ETHERTYPE_PPPOES2:
 369                 pppoe_print(/*ndo,*/p, length);
 370                 return (1);
 371
 372         case ETHERTYPE_EAPOL:
 373                 eap_print(ndo, p, length);
 374                 return (1);
 375
 376         case ETHERTYPE_RRCP:
 377                 rrcp_print(ndo, p - 14 , length + 14);
 378                 return (1);
 379
 380         case ETHERTYPE_PPP:
 381                 if (length) {
 382                         printf(": ");
 383                         ppp_print(/*ndo,*/p, length);
 384                 }
 385                 return (1);
 386
 387         case ETHERTYPE_MPCP:
 388                 mpcp_print(/*ndo,*/p, length);
 389                 return (1);
 390
 391         case ETHERTYPE_SLOW:
 392                 slow_print(/*ndo,*/p, length);
 393                 return (1);
 394
 395         case ETHERTYPE_CFM:
 396         case ETHERTYPE_CFM_OLD:
 397                 cfm_print(/*ndo,*/p, length);
 398                 return (1);
 399
 400         case ETHERTYPE_LLDP:
 401                 lldp_print(/*ndo,*/p, length);
 402                 return (1);
 403
 404         case ETHERTYPE_LOOPBACK:
 405                 return (1);
 406
 407         case ETHERTYPE_MPLS:
 408         case ETHERTYPE_MPLS_MULTI:
 409                 mpls_print(/*ndo,*/p, length);
 410                 return (1);
 411
 412         case ETHERTYPE_TIPC:
 413                 tipc_print(ndo, p, length, caplen);
 414                 return (1);
 415
 416         case ETHERTYPE_MS_NLB_HB:
 417                 msnlb_print(ndo, p);
 418                 return (1);
 419
 420         case ETHERTYPE_LAT:
 421         case ETHERTYPE_SCA:
 422         case ETHERTYPE_MOPRC:
 423         case ETHERTYPE_MOPDL:
 424                 /* default_print for now */
 425         default:
 426                 return (0);
 427         }
 428 }
 429
 430
 431 /*
 432  * Local Variables:
 433  * c-style: whitesmith
 434  * c-basic-offset: 8
 435  * End:
 436  */
 437