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     { 0, NULL}
  86 };
  87
  88 static inline void
  89 ether_hdr_print(netdissect_options *ndo,
  90                 const u_char *bp, u_int length)
  91 {
  92         register const struct ether_header *ep;
  93         uint16_t ether_type;
  94
  95         ep = (const struct ether_header *)bp;
  96
  97         ND_PRINT((ndo, "%s > %s",
  98                      etheraddr_string(ndo, ESRC(ep)),
  99                      etheraddr_string(ndo, EDST(ep))));
 100
 101         ether_type = EXTRACT_16BITS(&ep->ether_type);
 102         if (!ndo->ndo_qflag) {
 103                 if (ether_type <= ETHERMTU)
 104                           ND_PRINT((ndo, ", 802.3"));
 105                 else
 106                           ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 107                                        tok2str(ethertype_values,"Unknown", ether_type),
 108                                        ether_type));
 109         } else {
 110                 if (ether_type <= ETHERMTU)
 111                           ND_PRINT((ndo, ", 802.3"));
 112                 else
 113                           ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 114         }
 115
 116         ND_PRINT((ndo, ", length %u: ", length));
 117 }
 118
 119 /*
 120  * Print an Ethernet frame.
 121  * This might be encapsulated within another frame; we might be passed
 122  * a pointer to a function that can print header information for that
 123  * frame's protocol, and an argument to pass to that function.
 124  */
 125 u_int
 126 ether_print(netdissect_options *ndo,
 127             const u_char *p, u_int length, u_int caplen,
 128             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 129 {
 130         struct ether_header *ep;
 131         u_int orig_length;
 132         u_short ether_type;
 133         u_int hdrlen;
 134         int llc_hdrlen;
 135
 136         if (caplen < ETHER_HDRLEN) {
 137                 ND_PRINT((ndo, "[|ether]"));
 138                 return (caplen);
 139         }
 140         if (length < ETHER_HDRLEN) {
 141                 ND_PRINT((ndo, "[|ether]"));
 142                 return (length);
 143         }
 144
 145         if (ndo->ndo_eflag) {
 146                 if (print_encap_header != NULL)
 147                         (*print_encap_header)(ndo, encap_header_arg);
 148                 ether_hdr_print(ndo, p, length);
 149         }
 150         orig_length = length;
 151
 152         length -= ETHER_HDRLEN;
 153         caplen -= ETHER_HDRLEN;
 154         ep = (struct ether_header *)p;
 155         p += ETHER_HDRLEN;
 156         hdrlen = 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                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 167                 if (llc_hdrlen < 0) {
 168                         /* packet type not known, print raw packet */
 169                         if (!ndo->ndo_suppress_default_print)
 170                                 ND_DEFAULTPRINT(p, caplen);
 171                         llc_hdrlen = -llc_hdrlen;
 172                 }
 173                 hdrlen += llc_hdrlen;
 174         } else if (ether_type == ETHERTYPE_8021Q  ||
 175                 ether_type == ETHERTYPE_8021Q9100 ||
 176                 ether_type == ETHERTYPE_8021Q9200 ||
 177                 ether_type == ETHERTYPE_8021QinQ) {
 178                 /*
 179                  * Print VLAN information, and then go back and process
 180                  * the enclosed type field.
 181                  */
 182                 if (caplen < 4) {
 183                         ND_PRINT((ndo, "[|vlan]"));
 184                         return (hdrlen + caplen);
 185                 }
 186                 if (length < 4) {
 187                         ND_PRINT((ndo, "[|vlan]"));
 188                         return (hdrlen + length);
 189                 }
 190                 if (ndo->ndo_eflag) {
 191                         uint16_t tag = EXTRACT_16BITS(p);
 192
 193                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 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                 hdrlen += 4;
 203                 goto recurse;
 204         } else if (ether_type == ETHERTYPE_JUMBO) {
 205                 /*
 206                  * Alteon jumbo frames.
 207                  * See
 208                  *
 209                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 210                  *
 211                  * which indicates that, following the type field,
 212                  * there's an LLC header and payload.
 213                  */
 214                 /* Try to print the LLC-layer header & higher layers */
 215                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 216                 if (llc_hdrlen < 0) {
 217                         /* packet type not known, print raw packet */
 218                         if (!ndo->ndo_suppress_default_print)
 219                                 ND_DEFAULTPRINT(p, caplen);
 220                         llc_hdrlen = -llc_hdrlen;
 221                 }
 222                 hdrlen += llc_hdrlen;
 223         } else {
 224                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 225                         /* ether_type not known, print raw packet */
 226                         if (!ndo->ndo_eflag) {
 227                                 if (print_encap_header != NULL)
 228                                         (*print_encap_header)(ndo, encap_header_arg);
 229                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 230                         }
 231
 232                         if (!ndo->ndo_suppress_default_print)
 233                                 ND_DEFAULTPRINT(p, caplen);
 234                 }
 235         }
 236         return (hdrlen);
 237 }
 238
 239 /*
 240  * This is the top level routine of the printer.  'p' points
 241  * to the ether header of the packet, 'h->ts' is the timestamp,
 242  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 243  * is the number of bytes actually captured.
 244  */
 245 u_int
 246 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 247                const u_char *p)
 248 {
 249         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 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         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 275 }
 276
 277 /*
 278  * This is the top level routine of the printer.  'p' points
 279  * to the ether header of the packet, 'h->ts' is the timestamp,
 280  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 281  * is the number of bytes actually captured.
 282  *
 283  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 284  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 285  * before the Ethernet header.
 286  */
 287 u_int
 288 netanalyzer_transparent_if_print(netdissect_options *ndo,
 289                                  const struct pcap_pkthdr *h,
 290                                  const u_char *p)
 291 {
 292         /*
 293          * Fail if we don't have enough data for the Hilscher pseudo-header,
 294          * preamble, and SOF.
 295          */
 296         if (h->len < 12 || h->caplen < 12) {
 297                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 298                 return (h->caplen);
 299         }
 300
 301         /* Skip the pseudo-header, preamble, and SOF. */
 302         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 303 }
 304
 305 /*
 306  * Prints the packet payload, given an Ethernet type code for the payload's
 307  * protocol.
 308  *
 309  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 310  */
 311
 312 int
 313 ethertype_print(netdissect_options *ndo,
 314                 u_short ether_type, const u_char *p,
 315                 u_int length, u_int caplen)
 316 {
 317         switch (ether_type) {
 318
 319         case ETHERTYPE_IP:
 320                 ip_print(ndo, p, length);
 321                 return (1);
 322
 323         case ETHERTYPE_IPV6:
 324                 ip6_print(ndo, p, length);
 325                 return (1);
 326
 327         case ETHERTYPE_ARP:
 328         case ETHERTYPE_REVARP:
 329                 arp_print(ndo, p, length, caplen);
 330                 return (1);
 331
 332         case ETHERTYPE_DN:
 333                 decnet_print(ndo, p, length, caplen);
 334                 return (1);
 335
 336         case ETHERTYPE_ATALK:
 337                 if (ndo->ndo_vflag)
 338                         ND_PRINT((ndo, "et1 "));
 339                 atalk_print(ndo, p, length);
 340                 return (1);
 341
 342         case ETHERTYPE_AARP:
 343                 aarp_print(ndo, p, length);
 344                 return (1);
 345
 346         case ETHERTYPE_IPX:
 347                 ND_PRINT((ndo, "(NOV-ETHII) "));
 348                 ipx_print(ndo, p, length);
 349                 return (1);
 350
 351         case ETHERTYPE_ISO:
 352                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 353                 return(1);
 354
 355         case ETHERTYPE_PPPOED:
 356         case ETHERTYPE_PPPOES:
 357         case ETHERTYPE_PPPOED2:
 358         case ETHERTYPE_PPPOES2:
 359                 pppoe_print(ndo, p, length);
 360                 return (1);
 361
 362         case ETHERTYPE_EAPOL:
 363                 eap_print(ndo, p, length);
 364                 return (1);
 365
 366         case ETHERTYPE_RRCP:
 367                 rrcp_print(ndo, p - 14 , length + 14);
 368                 return (1);
 369
 370         case ETHERTYPE_PPP:
 371                 if (length) {
 372                         ND_PRINT((ndo, ": "));
 373                         ppp_print(ndo, p, length);
 374                 }
 375                 return (1);
 376
 377         case ETHERTYPE_MPCP:
 378                 mpcp_print(ndo, p, length);
 379                 return (1);
 380
 381         case ETHERTYPE_SLOW:
 382                 slow_print(ndo, p, length);
 383                 return (1);
 384
 385         case ETHERTYPE_CFM:
 386         case ETHERTYPE_CFM_OLD:
 387                 cfm_print(ndo, p, length);
 388                 return (1);
 389
 390         case ETHERTYPE_LLDP:
 391                 lldp_print(ndo, p, length);
 392                 return (1);
 393
 394         case ETHERTYPE_LOOPBACK:
 395                 loopback_print(ndo, p, length);
 396                 return (1);
 397
 398         case ETHERTYPE_MPLS:
 399         case ETHERTYPE_MPLS_MULTI:
 400                 mpls_print(ndo, p, length);
 401                 return (1);
 402
 403         case ETHERTYPE_TIPC:
 404                 tipc_print(ndo, p, length, caplen);
 405                 return (1);
 406
 407         case ETHERTYPE_MS_NLB_HB:
 408                 msnlb_print(ndo, p);
 409                 return (1);
 410
 411         case ETHERTYPE_GEONET_OLD:
 412         case ETHERTYPE_GEONET:
 413                 geonet_print(ndo, p-14, p, length);
 414                 return (1);
 415
 416         case ETHERTYPE_CALM_FAST:
 417                 calm_fast_print(ndo, p-14, p, length);
 418                 return (1);
 419
 420         case ETHERTYPE_AOE:
 421                 aoe_print(ndo, p, length);
 422                 return (1);
 423
 424         case ETHERTYPE_LAT:
 425         case ETHERTYPE_SCA:
 426         case ETHERTYPE_MOPRC:
 427         case ETHERTYPE_MOPDL:
 428         case ETHERTYPE_IEEE1905_1:
 429                 /* default_print for now */
 430         default:
 431                 return (0);
 432         }
 433 }
 434
 435
 436 /*
 437  * Local Variables:
 438  * c-style: whitesmith
 439  * c-basic-offset: 8
 440  * End:
 441  */
 442