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 void
 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
 134         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 135                 ND_PRINT((ndo, "[|ether]"));
 136                 return;
 137         }
 138
 139         if (ndo->ndo_eflag) {
 140                 if (print_encap_header != NULL)
 141                         (*print_encap_header)(ndo, encap_header_arg);
 142                 ether_hdr_print(ndo, p, length);
 143         }
 144         orig_length = length;
 145
 146         length -= ETHER_HDRLEN;
 147         caplen -= ETHER_HDRLEN;
 148         ep = (struct ether_header *)p;
 149         p += ETHER_HDRLEN;
 150
 151         ether_type = EXTRACT_16BITS(&ep->ether_type);
 152
 153 recurse:
 154         /*
 155          * Is it (gag) an 802.3 encapsulation?
 156          */
 157         if (ether_type <= ETHERMTU) {
 158                 /* Try to print the LLC-layer header & higher layers */
 159                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep)) == 0) {
 160                         /* ether_type not known, print raw packet */
 161                         if (!ndo->ndo_suppress_default_print)
 162                                 ND_DEFAULTPRINT(p, caplen);
 163                 }
 164         } else if (ether_type == ETHERTYPE_8021Q  ||
 165                 ether_type == ETHERTYPE_8021Q9100 ||
 166                 ether_type == ETHERTYPE_8021Q9200 ||
 167                 ether_type == ETHERTYPE_8021QinQ) {
 168                 /*
 169                  * Print VLAN information, and then go back and process
 170                  * the enclosed type field.
 171                  */
 172                 if (caplen < 4 || length < 4) {
 173                         ND_PRINT((ndo, "[|vlan]"));
 174                         return;
 175                 }
 176                 if (ndo->ndo_eflag) {
 177                         uint16_t tag = EXTRACT_16BITS(p);
 178
 179                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 180                 }
 181
 182                 ether_type = EXTRACT_16BITS(p + 2);
 183                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 184                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 185                 p += 4;
 186                 length -= 4;
 187                 caplen -= 4;
 188                 goto recurse;
 189         } else if (ether_type == ETHERTYPE_JUMBO) {
 190                 /*
 191                  * Alteon jumbo frames.
 192                  * See
 193                  *
 194                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 195                  *
 196                  * which indicates that, following the type field,
 197                  * there's an LLC header and payload.
 198                  */
 199                 /* Try to print the LLC-layer header & higher layers */
 200                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep)) == 0) {
 201                         /* ether_type not known, print raw packet */
 202                         if (!ndo->ndo_suppress_default_print)
 203                                 ND_DEFAULTPRINT(p, caplen);
 204                 }
 205         } else {
 206                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 207                         /* ether_type not known, print raw packet */
 208                         if (!ndo->ndo_eflag) {
 209                                 if (print_encap_header != NULL)
 210                                         (*print_encap_header)(ndo, encap_header_arg);
 211                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 212                         }
 213
 214                         if (!ndo->ndo_suppress_default_print)
 215                                 ND_DEFAULTPRINT(p, caplen);
 216                 }
 217         }
 218 }
 219
 220 /*
 221  * This is the top level routine of the printer.  'p' points
 222  * to the ether header of the packet, 'h->ts' is the timestamp,
 223  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 224  * is the number of bytes actually captured.
 225  */
 226 u_int
 227 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 228                const u_char *p)
 229 {
 230         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 231
 232         return (ETHER_HDRLEN);
 233 }
 234
 235 /*
 236  * This is the top level routine of the printer.  'p' points
 237  * to the ether header of the packet, 'h->ts' is the timestamp,
 238  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 239  * is the number of bytes actually captured.
 240  *
 241  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 242  * before the Ethernet header.
 243  */
 244 u_int
 245 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 246                      const u_char *p)
 247 {
 248         /*
 249          * Fail if we don't have enough data for the Hilscher pseudo-header.
 250          */
 251         if (h->len < 4 || h->caplen < 4) {
 252                 ND_PRINT((ndo, "[|netanalyzer]"));
 253                 return (h->caplen);
 254         }
 255
 256         /* Skip the pseudo-header. */
 257         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 258
 259         return (4 + ETHER_HDRLEN);
 260 }
 261
 262 /*
 263  * This is the top level routine of the printer.  'p' points
 264  * to the ether header of the packet, 'h->ts' is the timestamp,
 265  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 266  * is the number of bytes actually captured.
 267  *
 268  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 269  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 270  * before the Ethernet header.
 271  */
 272 u_int
 273 netanalyzer_transparent_if_print(netdissect_options *ndo,
 274                                  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          * preamble, and SOF.
 280          */
 281         if (h->len < 12 || h->caplen < 12) {
 282                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 283                 return (h->caplen);
 284         }
 285
 286         /* Skip the pseudo-header, preamble, and SOF. */
 287         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 288
 289         return (12 + ETHER_HDRLEN);
 290 }
 291
 292 /*
 293  * Prints the packet payload, given an Ethernet type code for the payload's
 294  * protocol.
 295  *
 296  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 297  */
 298
 299 int
 300 ethertype_print(netdissect_options *ndo,
 301                 u_short ether_type, const u_char *p,
 302                 u_int length, u_int caplen)
 303 {
 304         switch (ether_type) {
 305
 306         case ETHERTYPE_IP:
 307                 ip_print(ndo, p, length);
 308                 return (1);
 309
 310         case ETHERTYPE_IPV6:
 311                 ip6_print(ndo, p, length);
 312                 return (1);
 313
 314         case ETHERTYPE_ARP:
 315         case ETHERTYPE_REVARP:
 316                 arp_print(ndo, p, length, caplen);
 317                 return (1);
 318
 319         case ETHERTYPE_DN:
 320                 decnet_print(ndo, p, length, caplen);
 321                 return (1);
 322
 323         case ETHERTYPE_ATALK:
 324                 if (ndo->ndo_vflag)
 325                         ND_PRINT((ndo, "et1 "));
 326                 atalk_print(ndo, p, length);
 327                 return (1);
 328
 329         case ETHERTYPE_AARP:
 330                 aarp_print(ndo, p, length);
 331                 return (1);
 332
 333         case ETHERTYPE_IPX:
 334                 ND_PRINT((ndo, "(NOV-ETHII) "));
 335                 ipx_print(ndo, p, length);
 336                 return (1);
 337
 338         case ETHERTYPE_ISO:
 339                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 340                 return(1);
 341
 342         case ETHERTYPE_PPPOED:
 343         case ETHERTYPE_PPPOES:
 344         case ETHERTYPE_PPPOED2:
 345         case ETHERTYPE_PPPOES2:
 346                 pppoe_print(ndo, p, length);
 347                 return (1);
 348
 349         case ETHERTYPE_EAPOL:
 350                 eap_print(ndo, p, length);
 351                 return (1);
 352
 353         case ETHERTYPE_RRCP:
 354                 rrcp_print(ndo, p - 14 , length + 14);
 355                 return (1);
 356
 357         case ETHERTYPE_PPP:
 358                 if (length) {
 359                         ND_PRINT((ndo, ": "));
 360                         ppp_print(ndo, p, length);
 361                 }
 362                 return (1);
 363
 364         case ETHERTYPE_MPCP:
 365                 mpcp_print(ndo, p, length);
 366                 return (1);
 367
 368         case ETHERTYPE_SLOW:
 369                 slow_print(ndo, p, length);
 370                 return (1);
 371
 372         case ETHERTYPE_CFM:
 373         case ETHERTYPE_CFM_OLD:
 374                 cfm_print(ndo, p, length);
 375                 return (1);
 376
 377         case ETHERTYPE_LLDP:
 378                 lldp_print(ndo, p, length);
 379                 return (1);
 380
 381         case ETHERTYPE_LOOPBACK:
 382                 loopback_print(ndo, p, length);
 383                 return (1);
 384
 385         case ETHERTYPE_MPLS:
 386         case ETHERTYPE_MPLS_MULTI:
 387                 mpls_print(ndo, p, length);
 388                 return (1);
 389
 390         case ETHERTYPE_TIPC:
 391                 tipc_print(ndo, p, length, caplen);
 392                 return (1);
 393
 394         case ETHERTYPE_MS_NLB_HB:
 395                 msnlb_print(ndo, p);
 396                 return (1);
 397
 398         case ETHERTYPE_GEONET_OLD:
 399         case ETHERTYPE_GEONET:
 400                 geonet_print(ndo, p-14, p, length);
 401                 return (1);
 402
 403         case ETHERTYPE_CALM_FAST:
 404                 calm_fast_print(ndo, p-14, p, length);
 405                 return (1);
 406
 407         case ETHERTYPE_AOE:
 408                 aoe_print(ndo, p, length);
 409                 return (1);
 410
 411         case ETHERTYPE_LAT:
 412         case ETHERTYPE_SCA:
 413         case ETHERTYPE_MOPRC:
 414         case ETHERTYPE_MOPDL:
 415         case ETHERTYPE_IEEE1905_1:
 416                 /* default_print for now */
 417         default:
 418                 return (0);
 419         }
 420 }
 421
 422
 423 /*
 424  * Local Variables:
 425  * c-style: whitesmith
 426  * c-basic-offset: 8
 427  * End:
 428  */
 429