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 /* \summary: Ethernet printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33 #include "ethertype.h"
  34 #include "ether.h"
  35
  36 const struct tok ethertype_values[] = {
  37     { ETHERTYPE_IP,             "IPv4" },
  38     { ETHERTYPE_MPLS,           "MPLS unicast" },
  39     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  40     { ETHERTYPE_IPV6,           "IPv6" },
  41     { ETHERTYPE_8021Q,          "802.1Q" },
  42     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  43     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  44     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  45     { ETHERTYPE_VMAN,           "VMAN" },
  46     { ETHERTYPE_PUP,            "PUP" },
  47     { ETHERTYPE_ARP,            "ARP"},
  48     { ETHERTYPE_REVARP,         "Reverse ARP"},
  49     { ETHERTYPE_NS,             "NS" },
  50     { ETHERTYPE_SPRITE,         "Sprite" },
  51     { ETHERTYPE_TRAIL,          "Trail" },
  52     { ETHERTYPE_MOPDL,          "MOP DL" },
  53     { ETHERTYPE_MOPRC,          "MOP RC" },
  54     { ETHERTYPE_DN,             "DN" },
  55     { ETHERTYPE_LAT,            "LAT" },
  56     { ETHERTYPE_SCA,            "SCA" },
  57     { ETHERTYPE_TEB,            "TEB" },
  58     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  59     { ETHERTYPE_DECDNS,         "DEC DNS" },
  60     { ETHERTYPE_DECDTS,         "DEC DTS" },
  61     { ETHERTYPE_VEXP,           "VEXP" },
  62     { ETHERTYPE_VPROD,          "VPROD" },
  63     { ETHERTYPE_ATALK,          "Appletalk" },
  64     { ETHERTYPE_AARP,           "Appletalk ARP" },
  65     { ETHERTYPE_IPX,            "IPX" },
  66     { ETHERTYPE_PPP,            "PPP" },
  67     { ETHERTYPE_MPCP,           "MPCP" },
  68     { ETHERTYPE_SLOW,           "Slow Protocols" },
  69     { ETHERTYPE_PPPOED,         "PPPoE D" },
  70     { ETHERTYPE_PPPOES,         "PPPoE S" },
  71     { ETHERTYPE_EAPOL,          "EAPOL" },
  72     { ETHERTYPE_RRCP,           "RRCP" },
  73     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  74     { ETHERTYPE_JUMBO,          "Jumbo" },
  75     { ETHERTYPE_LOOPBACK,       "Loopback" },
  76     { ETHERTYPE_ISO,            "OSI" },
  77     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  78     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  79     { ETHERTYPE_CFM,            "CFM" },
  80     { ETHERTYPE_IEEE1905_1,     "IEEE1905.1" },
  81     { ETHERTYPE_LLDP,           "LLDP" },
  82     { ETHERTYPE_TIPC,           "TIPC"},
  83     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
  84     { ETHERTYPE_GEONET,         "GeoNet"},
  85     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
  86     { ETHERTYPE_AOE,            "AoE" },
  87     { ETHERTYPE_MEDSA,          "MEDSA" },
  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         uint16_t length_type;
  97
  98         ep = (const struct ether_header *)bp;
  99
 100         ND_PRINT((ndo, "%s > %s",
 101                      etheraddr_string(ndo, ESRC(ep)),
 102                      etheraddr_string(ndo, EDST(ep))));
 103
 104         length_type = EXTRACT_16BITS(&ep->ether_length_type);
 105         if (!ndo->ndo_qflag) {
 106                 if (length_type <= ETHERMTU) {
 107                         ND_PRINT((ndo, ", 802.3"));
 108                         length = length_type;
 109                 } else
 110                         ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 111                                        tok2str(ethertype_values,"Unknown", length_type),
 112                                        length_type));
 113         } else {
 114                 if (length_type <= ETHERMTU) {
 115                         ND_PRINT((ndo, ", 802.3"));
 116                         length = length_type;
 117                 } else
 118                         ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", length_type)));
 119         }
 120
 121         ND_PRINT((ndo, ", length %u: ", length));
 122 }
 123
 124 /*
 125  * Print an Ethernet frame.
 126  * This might be encapsulated within another frame; we might be passed
 127  * a pointer to a function that can print header information for that
 128  * frame's protocol, and an argument to pass to that function.
 129  *
 130  * FIXME: caplen can and should be derived from ndo->ndo_snapend and p.
 131  */
 132 u_int
 133 ether_print(netdissect_options *ndo,
 134             const u_char *p, u_int length, u_int caplen,
 135             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 136 {
 137         const struct ether_header *ep;
 138         u_int orig_length;
 139         u_short length_type;
 140         u_int hdrlen;
 141         int llc_hdrlen;
 142         struct lladdr_info src, dst;
 143
 144         if (caplen < ETHER_HDRLEN) {
 145                 ND_PRINT((ndo, "[|ether]"));
 146                 return (caplen);
 147         }
 148         if (length < ETHER_HDRLEN) {
 149                 ND_PRINT((ndo, "[|ether]"));
 150                 return (length);
 151         }
 152
 153         if (ndo->ndo_eflag) {
 154                 if (print_encap_header != NULL)
 155                         (*print_encap_header)(ndo, encap_header_arg);
 156                 ether_hdr_print(ndo, p, length);
 157         }
 158         orig_length = length;
 159
 160         length -= ETHER_HDRLEN;
 161         caplen -= ETHER_HDRLEN;
 162         ep = (const struct ether_header *)p;
 163         p += ETHER_HDRLEN;
 164         hdrlen = ETHER_HDRLEN;
 165
 166         src.addr = ESRC(ep);
 167         src.addr_string = etheraddr_string;
 168         dst.addr = EDST(ep);
 169         dst.addr_string = etheraddr_string;
 170         length_type = EXTRACT_16BITS(&ep->ether_length_type);
 171
 172 recurse:
 173         /*
 174          * Is it (gag) an 802.3 encapsulation?
 175          */
 176         if (length_type <= ETHERMTU) {
 177                 /* Try to print the LLC-layer header & higher layers */
 178                 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 179                 if (llc_hdrlen < 0) {
 180                         /* packet type not known, print raw packet */
 181                         if (!ndo->ndo_suppress_default_print)
 182                                 ND_DEFAULTPRINT(p, caplen);
 183                         llc_hdrlen = -llc_hdrlen;
 184                 }
 185                 hdrlen += llc_hdrlen;
 186         } else if (length_type == ETHERTYPE_8021Q  ||
 187                 length_type == ETHERTYPE_8021Q9100 ||
 188                 length_type == ETHERTYPE_8021Q9200 ||
 189                 length_type == ETHERTYPE_8021QinQ) {
 190                 /*
 191                  * Print VLAN information, and then go back and process
 192                  * the enclosed type field.
 193                  */
 194                 if (caplen < 4) {
 195                         ND_PRINT((ndo, "[|vlan]"));
 196                         return (hdrlen + caplen);
 197                 }
 198                 if (length < 4) {
 199                         ND_PRINT((ndo, "[|vlan]"));
 200                         return (hdrlen + length);
 201                 }
 202                 if (ndo->ndo_eflag) {
 203                         uint16_t tag = EXTRACT_16BITS(p);
 204
 205                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 206                 }
 207
 208                 length_type = EXTRACT_16BITS(p + 2);
 209                 if (ndo->ndo_eflag && length_type > ETHERMTU)
 210                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
 211                 p += 4;
 212                 length -= 4;
 213                 caplen -= 4;
 214                 hdrlen += 4;
 215                 goto recurse;
 216         } else if (length_type == ETHERTYPE_JUMBO) {
 217                 /*
 218                  * Alteon jumbo frames.
 219                  * See
 220                  *
 221                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 222                  *
 223                  * which indicates that, following the type field,
 224                  * there's an LLC header and payload.
 225                  */
 226                 /* Try to print the LLC-layer header & higher layers */
 227                 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
 228                 if (llc_hdrlen < 0) {
 229                         /* packet type not known, print raw packet */
 230                         if (!ndo->ndo_suppress_default_print)
 231                                 ND_DEFAULTPRINT(p, caplen);
 232                         llc_hdrlen = -llc_hdrlen;
 233                 }
 234                 hdrlen += llc_hdrlen;
 235         } else {
 236                 if (ethertype_print(ndo, length_type, p, length, caplen, &src, &dst) == 0) {
 237                         /* type not known, print raw packet */
 238                         if (!ndo->ndo_eflag) {
 239                                 if (print_encap_header != NULL)
 240                                         (*print_encap_header)(ndo, encap_header_arg);
 241                                 ether_hdr_print(ndo, (const u_char *)ep, orig_length);
 242                         }
 243
 244                         if (!ndo->ndo_suppress_default_print)
 245                                 ND_DEFAULTPRINT(p, caplen);
 246                 }
 247         }
 248         return (hdrlen);
 249 }
 250
 251 /*
 252  * This is the top level routine of the printer.  'p' points
 253  * to the ether header of the packet, 'h->len' is the length
 254  * of the packet off the wire, and 'h->caplen' is the number
 255  * of bytes actually captured.
 256  */
 257 u_int
 258 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 259                const u_char *p)
 260 {
 261         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 262 }
 263
 264 /*
 265  * This is the top level routine of the printer.  'p' points
 266  * to the ether header of the packet, 'h->len' is the length
 267  * of the packet off the wire, and 'h->caplen' is the number
 268  * of bytes actually captured.
 269  *
 270  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 271  * before the Ethernet header.
 272  */
 273 u_int
 274 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 275                      const u_char *p)
 276 {
 277         /*
 278          * Fail if we don't have enough data for the Hilscher pseudo-header.
 279          */
 280         if (h->len < 4 || h->caplen < 4) {
 281                 ND_PRINT((ndo, "[|netanalyzer]"));
 282                 return (h->caplen);
 283         }
 284
 285         /* Skip the pseudo-header. */
 286         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 287 }
 288
 289 /*
 290  * This is the top level routine of the printer.  'p' points
 291  * to the ether header of the packet, 'h->len' is the length
 292  * of the packet off the wire, and 'h->caplen' is the number
 293  * of bytes actually captured.
 294  *
 295  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 296  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 297  * before the Ethernet header.
 298  */
 299 u_int
 300 netanalyzer_transparent_if_print(netdissect_options *ndo,
 301                                  const struct pcap_pkthdr *h,
 302                                  const u_char *p)
 303 {
 304         /*
 305          * Fail if we don't have enough data for the Hilscher pseudo-header,
 306          * preamble, and SOF.
 307          */
 308         if (h->len < 12 || h->caplen < 12) {
 309                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 310                 return (h->caplen);
 311         }
 312
 313         /* Skip the pseudo-header, preamble, and SOF. */
 314         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 315 }
 316
 317 /*
 318  * Prints the packet payload, given an Ethernet type code for the payload's
 319  * protocol.
 320  *
 321  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 322  */
 323
 324 int
 325 ethertype_print(netdissect_options *ndo,
 326                 u_short ether_type, const u_char *p,
 327                 u_int length, u_int caplen,
 328                 const struct lladdr_info *src, const struct lladdr_info *dst)
 329 {
 330         switch (ether_type) {
 331
 332         case ETHERTYPE_IP:
 333                 ip_print(ndo, p, length);
 334                 return (1);
 335
 336         case ETHERTYPE_IPV6:
 337                 ip6_print(ndo, p, length);
 338                 return (1);
 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                         ND_PRINT((ndo, "et1 "));
 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                 if (length == 0 || caplen == 0) {
 366                         ND_PRINT((ndo, " [|osi]"));
 367                         return (1);
 368                 }
 369                 isoclns_print(ndo, p + 1, length - 1);
 370                 return(1);
 371
 372         case ETHERTYPE_PPPOED:
 373         case ETHERTYPE_PPPOES:
 374         case ETHERTYPE_PPPOED2:
 375         case ETHERTYPE_PPPOES2:
 376                 pppoe_print(ndo, p, length);
 377                 return (1);
 378
 379         case ETHERTYPE_EAPOL:
 380                 eap_print(ndo, p, length);
 381                 return (1);
 382
 383         case ETHERTYPE_RRCP:
 384                 rrcp_print(ndo, p, length, src, dst);
 385                 return (1);
 386
 387         case ETHERTYPE_PPP:
 388                 if (length) {
 389                         ND_PRINT((ndo, ": "));
 390                         ppp_print(ndo, p, length);
 391                 }
 392                 return (1);
 393
 394         case ETHERTYPE_MPCP:
 395                 mpcp_print(ndo, p, length);
 396                 return (1);
 397
 398         case ETHERTYPE_SLOW:
 399                 slow_print(ndo, p, length);
 400                 return (1);
 401
 402         case ETHERTYPE_CFM:
 403         case ETHERTYPE_CFM_OLD:
 404                 cfm_print(ndo, p, length);
 405                 return (1);
 406
 407         case ETHERTYPE_LLDP:
 408                 lldp_print(ndo, p, length);
 409                 return (1);
 410
 411         case ETHERTYPE_LOOPBACK:
 412                 loopback_print(ndo, p, length);
 413                 return (1);
 414
 415         case ETHERTYPE_MPLS:
 416         case ETHERTYPE_MPLS_MULTI:
 417                 mpls_print(ndo, p, length);
 418                 return (1);
 419
 420         case ETHERTYPE_TIPC:
 421                 tipc_print(ndo, p, length, caplen);
 422                 return (1);
 423
 424         case ETHERTYPE_MS_NLB_HB:
 425                 msnlb_print(ndo, p);
 426                 return (1);
 427
 428         case ETHERTYPE_GEONET_OLD:
 429         case ETHERTYPE_GEONET:
 430                 geonet_print(ndo, p, length, src);
 431                 return (1);
 432
 433         case ETHERTYPE_CALM_FAST:
 434                 calm_fast_print(ndo, p, length, src);
 435                 return (1);
 436
 437         case ETHERTYPE_AOE:
 438                 aoe_print(ndo, p, length);
 439                 return (1);
 440
 441         case ETHERTYPE_MEDSA:
 442                 medsa_print(ndo, p, length, caplen, src, dst);
 443                 return (1);
 444
 445         case ETHERTYPE_LAT:
 446         case ETHERTYPE_SCA:
 447         case ETHERTYPE_MOPRC:
 448         case ETHERTYPE_MOPDL:
 449         case ETHERTYPE_IEEE1905_1:
 450                 /* default_print for now */
 451         default:
 452                 return (0);
 453         }
 454 }
 455
 456
 457 /*
 458  * Local Variables:
 459  * c-style: whitesmith
 460  * c-basic-offset: 8
 461  * End:
 462  */
 463