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     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
  89     { ETHERTYPE_GEONET,         "GeoNet"},
  90     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
  91     { 0, NULL}
  92 };
  93
  94 static inline void
  95 ether_hdr_print(netdissect_options *ndo,
  96                 const u_char *bp, u_int length)
  97 {
  98         register const struct ether_header *ep;
  99         u_int16_t ether_type;
 100
 101         ep = (const struct ether_header *)bp;
 102
 103         (void)ND_PRINT((ndo, "%s > %s",
 104                      etheraddr_string(ESRC(ep)),
 105                      etheraddr_string(EDST(ep))));
 106
 107         ether_type = EXTRACT_16BITS(&ep->ether_type);
 108         if (!ndo->ndo_qflag) {
 109                 if (ether_type <= ETHERMTU)
 110                           (void)ND_PRINT((ndo, ", 802.3"));
 111                 else
 112                           (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 113                                        tok2str(ethertype_values,"Unknown", ether_type),
 114                                        ether_type));
 115         } else {
 116                 if (ether_type <= ETHERMTU)
 117                           (void)ND_PRINT((ndo, ", 802.3"));
 118                 else
 119                           (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 120         }
 121
 122         (void)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 void
 132 ether_print(netdissect_options *ndo,
 133             const u_char *p, u_int length, u_int caplen,
 134             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 135 {
 136         struct ether_header *ep;
 137         u_int orig_length;
 138         u_short ether_type;
 139         u_short extracted_ether_type;
 140
 141         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 142                 ND_PRINT((ndo, "[|ether]"));
 143                 return;
 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
 158         ether_type = EXTRACT_16BITS(&ep->ether_type);
 159
 160 recurse:
 161         /*
 162          * Is it (gag) an 802.3 encapsulation?
 163          */
 164         if (ether_type <= ETHERMTU) {
 165                 /* Try to print the LLC-layer header & higher layers */
 166                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 167                     &extracted_ether_type) == 0) {
 168                         /* ether_type not known, print raw packet */
 169                         if (!ndo->ndo_eflag) {
 170                                 if (print_encap_header != NULL)
 171                                         (*print_encap_header)(ndo, encap_header_arg);
 172                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 173                         }
 174
 175                         if (!ndo->ndo_suppress_default_print)
 176                                 ndo->ndo_default_print(ndo, p, caplen);
 177                 }
 178         } else if (ether_type == ETHERTYPE_8021Q  ||
 179                 ether_type == ETHERTYPE_8021Q9100 ||
 180                 ether_type == ETHERTYPE_8021Q9200 ||
 181                 ether_type == ETHERTYPE_8021QinQ) {
 182                 /*
 183                  * Print VLAN information, and then go back and process
 184                  * the enclosed type field.
 185                  */
 186                 if (caplen < 4 || length < 4) {
 187                         ND_PRINT((ndo, "[|vlan]"));
 188                         return;
 189                 }
 190                 if (ndo->ndo_eflag) {
 191                         u_int16_t tag = EXTRACT_16BITS(p);
 192
 193                         ND_PRINT((ndo, "vlan %u, p %u%s, ",
 194                             tag & 0xfff,
 195                             tag >> 13,
 196                             (tag & 0x1000) ? ", CFI" : ""));
 197                 }
 198
 199                 ether_type = EXTRACT_16BITS(p + 2);
 200                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 201                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 202                 p += 4;
 203                 length -= 4;
 204                 caplen -= 4;
 205                 goto recurse;
 206         } else if (ether_type == ETHERTYPE_JUMBO) {
 207                 /*
 208                  * Alteon jumbo frames.
 209                  * See
 210                  *
 211                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 212                  *
 213                  * which indicates that, following the type field,
 214                  * there's an LLC header and payload.
 215                  */
 216                 /* Try to print the LLC-layer header & higher layers */
 217                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 218                     &extracted_ether_type) == 0) {
 219                         /* ether_type not known, print raw packet */
 220                         if (!ndo->ndo_eflag) {
 221                                 if (print_encap_header != NULL)
 222                                         (*print_encap_header)(ndo, encap_header_arg);
 223                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 224                         }
 225
 226                         if (!ndo->ndo_suppress_default_print)
 227                                 ndo->ndo_default_print(ndo, p, caplen);
 228                 }
 229         } else {
 230                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 231                         /* ether_type not known, print raw packet */
 232                         if (!ndo->ndo_eflag) {
 233                                 if (print_encap_header != NULL)
 234                                         (*print_encap_header)(ndo, encap_header_arg);
 235                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 236                         }
 237
 238                         if (!ndo->ndo_suppress_default_print)
 239                                 ndo->ndo_default_print(ndo, p, caplen);
 240                 }
 241         }
 242 }
 243
 244 /*
 245  * This is the top level routine of the printer.  'p' points
 246  * to the ether header of the packet, 'h->ts' is the timestamp,
 247  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 248  * is the number of bytes actually captured.
 249  */
 250 u_int
 251 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 252                const u_char *p)
 253 {
 254         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 255
 256         return (ETHER_HDRLEN);
 257 }
 258
 259 /*
 260  * This is the top level routine of the printer.  'p' points
 261  * to the ether header of the packet, 'h->ts' is the timestamp,
 262  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 263  * is the number of bytes actually captured.
 264  *
 265  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 266  * before the Ethernet header.
 267  */
 268 u_int
 269 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 270                      const u_char *p)
 271 {
 272         /*
 273          * Fail if we don't have enough data for the Hilscher pseudo-header.
 274          */
 275         if (h->len < 4 || h->caplen < 4) {
 276                 printf("[|netanalyzer]");
 277                 return (h->caplen);
 278         }
 279
 280         /* Skip the pseudo-header. */
 281         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 282
 283         return (4 + ETHER_HDRLEN);
 284 }
 285
 286 /*
 287  * This is the top level routine of the printer.  'p' points
 288  * to the ether header of the packet, 'h->ts' is the timestamp,
 289  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 290  * is the number of bytes actually captured.
 291  *
 292  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 293  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 294  * before the Ethernet header.
 295  */
 296 u_int
 297 netanalyzer_transparent_if_print(netdissect_options *ndo,
 298                                  const struct pcap_pkthdr *h,
 299                                  const u_char *p)
 300 {
 301         /*
 302          * Fail if we don't have enough data for the Hilscher pseudo-header,
 303          * preamble, and SOF.
 304          */
 305         if (h->len < 12 || h->caplen < 12) {
 306                 printf("[|netanalyzer-transparent]");
 307                 return (h->caplen);
 308         }
 309
 310         /* Skip the pseudo-header, preamble, and SOF. */
 311         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 312
 313         return (12 + ETHER_HDRLEN);
 314 }
 315
 316 /*
 317  * Prints the packet payload, given an Ethernet type code for the payload's
 318  * protocol.
 319  *
 320  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 321  */
 322
 323 int
 324 ethertype_print(netdissect_options *ndo,
 325                 u_short ether_type, const u_char *p,
 326                 u_int length, u_int caplen)
 327 {
 328         switch (ether_type) {
 329
 330         case ETHERTYPE_IP:
 331                 ip_print(ndo, p, length);
 332                 return (1);
 333
 334 #ifdef INET6
 335         case ETHERTYPE_IPV6:
 336                 ip6_print(ndo, p, length);
 337                 return (1);
 338 #endif /*INET6*/
 339
 340         case ETHERTYPE_ARP:
 341         case ETHERTYPE_REVARP:
 342                 arp_print(ndo, p, length, caplen);
 343                 return (1);
 344
 345         case ETHERTYPE_DN:
 346                 decnet_print(/*ndo,*/p, length, caplen);
 347                 return (1);
 348
 349         case ETHERTYPE_ATALK:
 350                 if (ndo->ndo_vflag)
 351                         fputs("et1 ", stdout);
 352                 atalk_print(/*ndo,*/p, length);
 353                 return (1);
 354
 355         case ETHERTYPE_AARP:
 356                 aarp_print(/*ndo,*/p, length);
 357                 return (1);
 358
 359         case ETHERTYPE_IPX:
 360                 ND_PRINT((ndo, "(NOV-ETHII) "));
 361                 ipx_print(/*ndo,*/p, length);
 362                 return (1);
 363
 364         case ETHERTYPE_ISO:
 365                 isoclns_print(/*ndo,*/p+1, length-1, length-1);
 366                 return(1);
 367
 368         case ETHERTYPE_PPPOED:
 369         case ETHERTYPE_PPPOES:
 370         case ETHERTYPE_PPPOED2:
 371         case ETHERTYPE_PPPOES2:
 372                 pppoe_print(/*ndo,*/p, length);
 373                 return (1);
 374
 375         case ETHERTYPE_EAPOL:
 376                 eap_print(ndo, p, length);
 377                 return (1);
 378
 379         case ETHERTYPE_RRCP:
 380                 rrcp_print(ndo, p - 14 , length + 14);
 381                 return (1);
 382
 383         case ETHERTYPE_PPP:
 384                 if (length) {
 385                         printf(": ");
 386                         ppp_print(/*ndo,*/p, length);
 387                 }
 388                 return (1);
 389
 390         case ETHERTYPE_MPCP:
 391                 mpcp_print(/*ndo,*/p, length);
 392                 return (1);
 393
 394         case ETHERTYPE_SLOW:
 395                 slow_print(/*ndo,*/p, length);
 396                 return (1);
 397
 398         case ETHERTYPE_CFM:
 399         case ETHERTYPE_CFM_OLD:
 400                 cfm_print(/*ndo,*/p, length);
 401                 return (1);
 402
 403         case ETHERTYPE_LLDP:
 404                 lldp_print(/*ndo,*/p, length);
 405                 return (1);
 406
 407         case ETHERTYPE_LOOPBACK:
 408                 return (1);
 409
 410         case ETHERTYPE_MPLS:
 411         case ETHERTYPE_MPLS_MULTI:
 412                 mpls_print(/*ndo,*/p, length);
 413                 return (1);
 414
 415         case ETHERTYPE_TIPC:
 416                 tipc_print(ndo, p, length, caplen);
 417                 return (1);
 418
 419         case ETHERTYPE_MS_NLB_HB:
 420                 msnlb_print(ndo, p);
 421                 return (1);
 422
 423         case ETHERTYPE_GEONET_OLD:
 424         case ETHERTYPE_GEONET:
 425                 geonet_print(ndo, p-14, p, length);
 426                 return (1);
 427
 428         case ETHERTYPE_CALM_FAST:
 429                 calm_fast_print(ndo, p-14, p, length);
 430                 return (1);
 431
 432         case ETHERTYPE_LAT:
 433         case ETHERTYPE_SCA:
 434         case ETHERTYPE_MOPRC:
 435         case ETHERTYPE_MOPDL:
 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