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 u_int
 131 ether_print(netdissect_options *ndo,
 132             const u_char *p, u_int length, u_int caplen,
 133             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 134 {
 135         const struct ether_header *ep;
 136         u_int orig_length;
 137         u_short length_type;
 138         u_int hdrlen;
 139         int llc_hdrlen;
 140
 141         if (caplen < ETHER_HDRLEN) {
 142                 ND_PRINT((ndo, "[|ether]"));
 143                 return (caplen);
 144         }
 145         if (length < ETHER_HDRLEN) {
 146                 ND_PRINT((ndo, "[|ether]"));
 147                 return (length);
 148         }
 149
 150         if (ndo->ndo_eflag) {
 151                 if (print_encap_header != NULL)
 152                         (*print_encap_header)(ndo, encap_header_arg);
 153                 ether_hdr_print(ndo, p, length);
 154         }
 155         orig_length = length;
 156
 157         length -= ETHER_HDRLEN;
 158         caplen -= ETHER_HDRLEN;
 159         ep = (const struct ether_header *)p;
 160         p += ETHER_HDRLEN;
 161         hdrlen = ETHER_HDRLEN;
 162
 163         length_type = EXTRACT_16BITS(&ep->ether_length_type);
 164
 165 recurse:
 166         /*
 167          * Is it (gag) an 802.3 encapsulation?
 168          */
 169         if (length_type <= ETHERMTU) {
 170                 /* Try to print the LLC-layer header & higher layers */
 171                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 172                 if (llc_hdrlen < 0) {
 173                         /* packet type not known, print raw packet */
 174                         if (!ndo->ndo_suppress_default_print)
 175                                 ND_DEFAULTPRINT(p, caplen);
 176                         llc_hdrlen = -llc_hdrlen;
 177                 }
 178                 hdrlen += llc_hdrlen;
 179         } else if (length_type == ETHERTYPE_8021Q  ||
 180                 length_type == ETHERTYPE_8021Q9100 ||
 181                 length_type == ETHERTYPE_8021Q9200 ||
 182                 length_type == ETHERTYPE_8021QinQ) {
 183                 /*
 184                  * Print VLAN information, and then go back and process
 185                  * the enclosed type field.
 186                  */
 187                 if (caplen < 4) {
 188                         ND_PRINT((ndo, "[|vlan]"));
 189                         return (hdrlen + caplen);
 190                 }
 191                 if (length < 4) {
 192                         ND_PRINT((ndo, "[|vlan]"));
 193                         return (hdrlen + length);
 194                 }
 195                 if (ndo->ndo_eflag) {
 196                         uint16_t tag = EXTRACT_16BITS(p);
 197
 198                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 199                 }
 200
 201                 length_type = EXTRACT_16BITS(p + 2);
 202                 if (ndo->ndo_eflag && length_type > ETHERMTU)
 203                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", length_type)));
 204                 p += 4;
 205                 length -= 4;
 206                 caplen -= 4;
 207                 hdrlen += 4;
 208                 goto recurse;
 209         } else if (length_type == ETHERTYPE_JUMBO) {
 210                 /*
 211                  * Alteon jumbo frames.
 212                  * See
 213                  *
 214                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 215                  *
 216                  * which indicates that, following the type field,
 217                  * there's an LLC header and payload.
 218                  */
 219                 /* Try to print the LLC-layer header & higher layers */
 220                 llc_hdrlen = llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep));
 221                 if (llc_hdrlen < 0) {
 222                         /* packet type not known, print raw packet */
 223                         if (!ndo->ndo_suppress_default_print)
 224                                 ND_DEFAULTPRINT(p, caplen);
 225                         llc_hdrlen = -llc_hdrlen;
 226                 }
 227                 hdrlen += llc_hdrlen;
 228         } else {
 229                 if (ethertype_print(ndo, length_type, p, length, caplen) == 0) {
 230                         /* type not known, print raw packet */
 231                         if (!ndo->ndo_eflag) {
 232                                 if (print_encap_header != NULL)
 233                                         (*print_encap_header)(ndo, encap_header_arg);
 234                                 ether_hdr_print(ndo, (const u_char *)ep, orig_length);
 235                         }
 236
 237                         if (!ndo->ndo_suppress_default_print)
 238                                 ND_DEFAULTPRINT(p, caplen);
 239                 }
 240         }
 241         return (hdrlen);
 242 }
 243
 244 /*
 245  * This is the top level routine of the printer.  'p' points
 246  * to the ether header of the packet, 'h->len' is the length
 247  * of the packet off the wire, and 'h->caplen' is the number
 248  * 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         return (ether_print(ndo, p, h->len, h->caplen, NULL, NULL));
 255 }
 256
 257 /*
 258  * This is the top level routine of the printer.  'p' points
 259  * to the ether header of the packet, 'h->len' is the length
 260  * of the packet off the wire, and 'h->caplen' is the number
 261  * of bytes actually captured.
 262  *
 263  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 264  * before the Ethernet header.
 265  */
 266 u_int
 267 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 268                      const u_char *p)
 269 {
 270         /*
 271          * Fail if we don't have enough data for the Hilscher pseudo-header.
 272          */
 273         if (h->len < 4 || h->caplen < 4) {
 274                 ND_PRINT((ndo, "[|netanalyzer]"));
 275                 return (h->caplen);
 276         }
 277
 278         /* Skip the pseudo-header. */
 279         return (4 + ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL));
 280 }
 281
 282 /*
 283  * This is the top level routine of the printer.  'p' points
 284  * to the ether header of the packet, 'h->len' is the length
 285  * of the packet off the wire, and 'h->caplen' is the number
 286  * of bytes actually captured.
 287  *
 288  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 289  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 290  * before the Ethernet header.
 291  */
 292 u_int
 293 netanalyzer_transparent_if_print(netdissect_options *ndo,
 294                                  const struct pcap_pkthdr *h,
 295                                  const u_char *p)
 296 {
 297         /*
 298          * Fail if we don't have enough data for the Hilscher pseudo-header,
 299          * preamble, and SOF.
 300          */
 301         if (h->len < 12 || h->caplen < 12) {
 302                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 303                 return (h->caplen);
 304         }
 305
 306         /* Skip the pseudo-header, preamble, and SOF. */
 307         return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
 308 }
 309
 310 /*
 311  * Prints the packet payload, given an Ethernet type code for the payload's
 312  * protocol.
 313  *
 314  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 315  */
 316
 317 int
 318 ethertype_print(netdissect_options *ndo,
 319                 u_short ether_type, const u_char *p,
 320                 u_int length, u_int caplen)
 321 {
 322         switch (ether_type) {
 323
 324         case ETHERTYPE_IP:
 325                 ip_print(ndo, p, length);
 326                 return (1);
 327
 328         case ETHERTYPE_IPV6:
 329                 ip6_print(ndo, p, length);
 330                 return (1);
 331
 332         case ETHERTYPE_ARP:
 333         case ETHERTYPE_REVARP:
 334                 arp_print(ndo, p, length, caplen);
 335                 return (1);
 336
 337         case ETHERTYPE_DN:
 338                 decnet_print(ndo, p, length, caplen);
 339                 return (1);
 340
 341         case ETHERTYPE_ATALK:
 342                 if (ndo->ndo_vflag)
 343                         ND_PRINT((ndo, "et1 "));
 344                 atalk_print(ndo, p, length);
 345                 return (1);
 346
 347         case ETHERTYPE_AARP:
 348                 aarp_print(ndo, p, length);
 349                 return (1);
 350
 351         case ETHERTYPE_IPX:
 352                 ND_PRINT((ndo, "(NOV-ETHII) "));
 353                 ipx_print(ndo, p, length);
 354                 return (1);
 355
 356         case ETHERTYPE_ISO:
 357                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 358                 return(1);
 359
 360         case ETHERTYPE_PPPOED:
 361         case ETHERTYPE_PPPOES:
 362         case ETHERTYPE_PPPOED2:
 363         case ETHERTYPE_PPPOES2:
 364                 pppoe_print(ndo, p, length);
 365                 return (1);
 366
 367         case ETHERTYPE_EAPOL:
 368                 eap_print(ndo, p, length);
 369                 return (1);
 370
 371         case ETHERTYPE_RRCP:
 372                 rrcp_print(ndo, p - 14 , length + 14);
 373                 return (1);
 374
 375         case ETHERTYPE_PPP:
 376                 if (length) {
 377                         ND_PRINT((ndo, ": "));
 378                         ppp_print(ndo, p, length);
 379                 }
 380                 return (1);
 381
 382         case ETHERTYPE_MPCP:
 383                 mpcp_print(ndo, p, length);
 384                 return (1);
 385
 386         case ETHERTYPE_SLOW:
 387                 slow_print(ndo, p, length);
 388                 return (1);
 389
 390         case ETHERTYPE_CFM:
 391         case ETHERTYPE_CFM_OLD:
 392                 cfm_print(ndo, p, length);
 393                 return (1);
 394
 395         case ETHERTYPE_LLDP:
 396                 lldp_print(ndo, p, length);
 397                 return (1);
 398
 399         case ETHERTYPE_LOOPBACK:
 400                 loopback_print(ndo, p, length);
 401                 return (1);
 402
 403         case ETHERTYPE_MPLS:
 404         case ETHERTYPE_MPLS_MULTI:
 405                 mpls_print(ndo, p, length);
 406                 return (1);
 407
 408         case ETHERTYPE_TIPC:
 409                 tipc_print(ndo, p, length, caplen);
 410                 return (1);
 411
 412         case ETHERTYPE_MS_NLB_HB:
 413                 msnlb_print(ndo, p);
 414                 return (1);
 415
 416         case ETHERTYPE_GEONET_OLD:
 417         case ETHERTYPE_GEONET:
 418                 geonet_print(ndo, p-14, p, length);
 419                 return (1);
 420
 421         case ETHERTYPE_CALM_FAST:
 422                 calm_fast_print(ndo, p-14, p, length);
 423                 return (1);
 424
 425         case ETHERTYPE_AOE:
 426                 aoe_print(ndo, p, length);
 427                 return (1);
 428
 429         case ETHERTYPE_MEDSA:
 430                 medsa_print(ndo, p, length, caplen);
 431                 return (1);
 432
 433         case ETHERTYPE_LAT:
 434         case ETHERTYPE_SCA:
 435         case ETHERTYPE_MOPRC:
 436         case ETHERTYPE_MOPDL:
 437         case ETHERTYPE_IEEE1905_1:
 438                 /* default_print for now */
 439         default:
 440                 return (0);
 441         }
 442 }
 443
 444
 445 /*
 446  * Local Variables:
 447  * c-style: whitesmith
 448  * c-basic-offset: 8
 449  * End:
 450  */
 451