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         u_short extracted_ether_type;
 134
 135         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 136                 ND_PRINT((ndo, "[|ether]"));
 137                 return;
 138         }
 139
 140         if (ndo->ndo_eflag) {
 141                 if (print_encap_header != NULL)
 142                         (*print_encap_header)(ndo, encap_header_arg);
 143                 ether_hdr_print(ndo, p, length);
 144         }
 145         orig_length = length;
 146
 147         length -= ETHER_HDRLEN;
 148         caplen -= ETHER_HDRLEN;
 149         ep = (struct ether_header *)p;
 150         p += ETHER_HDRLEN;
 151
 152         ether_type = EXTRACT_16BITS(&ep->ether_type);
 153
 154 recurse:
 155         /*
 156          * Is it (gag) an 802.3 encapsulation?
 157          */
 158         if (ether_type <= ETHERMTU) {
 159                 /* Try to print the LLC-layer header & higher layers */
 160                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 161                     &extracted_ether_type) == 0) {
 162                         /* ether_type not known, print raw packet */
 163                         if (!ndo->ndo_eflag) {
 164                                 if (print_encap_header != NULL)
 165                                         (*print_encap_header)(ndo, encap_header_arg);
 166                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 167                         }
 168
 169                         if (!ndo->ndo_suppress_default_print)
 170                                 ND_DEFAULTPRINT(p, caplen);
 171                 }
 172         } else if (ether_type == ETHERTYPE_8021Q  ||
 173                 ether_type == ETHERTYPE_8021Q9100 ||
 174                 ether_type == ETHERTYPE_8021Q9200 ||
 175                 ether_type == ETHERTYPE_8021QinQ) {
 176                 /*
 177                  * Print VLAN information, and then go back and process
 178                  * the enclosed type field.
 179                  */
 180                 if (caplen < 4 || length < 4) {
 181                         ND_PRINT((ndo, "[|vlan]"));
 182                         return;
 183                 }
 184                 if (ndo->ndo_eflag) {
 185                         uint16_t tag = EXTRACT_16BITS(p);
 186
 187                         ND_PRINT((ndo, "%s, ", ieee8021q_tci_string(tag)));
 188                 }
 189
 190                 ether_type = EXTRACT_16BITS(p + 2);
 191                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 192                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 193                 p += 4;
 194                 length -= 4;
 195                 caplen -= 4;
 196                 goto recurse;
 197         } else if (ether_type == ETHERTYPE_JUMBO) {
 198                 /*
 199                  * Alteon jumbo frames.
 200                  * See
 201                  *
 202                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 203                  *
 204                  * which indicates that, following the type field,
 205                  * there's an LLC header and payload.
 206                  */
 207                 /* Try to print the LLC-layer header & higher layers */
 208                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 209                     &extracted_ether_type) == 0) {
 210                         /* ether_type not known, print raw packet */
 211                         if (!ndo->ndo_eflag) {
 212                                 if (print_encap_header != NULL)
 213                                         (*print_encap_header)(ndo, encap_header_arg);
 214                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 215                         }
 216
 217                         if (!ndo->ndo_suppress_default_print)
 218                                 ND_DEFAULTPRINT(p, caplen);
 219                 }
 220         } else {
 221                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 222                         /* ether_type not known, print raw packet */
 223                         if (!ndo->ndo_eflag) {
 224                                 if (print_encap_header != NULL)
 225                                         (*print_encap_header)(ndo, encap_header_arg);
 226                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 227                         }
 228
 229                         if (!ndo->ndo_suppress_default_print)
 230                                 ND_DEFAULTPRINT(p, caplen);
 231                 }
 232         }
 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 u_int
 242 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 243                const u_char *p)
 244 {
 245         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 246
 247         return (ETHER_HDRLEN);
 248 }
 249
 250 /*
 251  * This is the top level routine of the printer.  'p' points
 252  * to the ether header of the packet, 'h->ts' is the timestamp,
 253  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 254  * is the number of bytes actually captured.
 255  *
 256  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 257  * before the Ethernet header.
 258  */
 259 u_int
 260 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 261                      const u_char *p)
 262 {
 263         /*
 264          * Fail if we don't have enough data for the Hilscher pseudo-header.
 265          */
 266         if (h->len < 4 || h->caplen < 4) {
 267                 ND_PRINT((ndo, "[|netanalyzer]"));
 268                 return (h->caplen);
 269         }
 270
 271         /* Skip the pseudo-header. */
 272         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 273
 274         return (4 + ETHER_HDRLEN);
 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         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 303
 304         return (12 + ETHER_HDRLEN);
 305 }
 306
 307 /*
 308  * Prints the packet payload, given an Ethernet type code for the payload's
 309  * protocol.
 310  *
 311  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 312  */
 313
 314 int
 315 ethertype_print(netdissect_options *ndo,
 316                 u_short ether_type, const u_char *p,
 317                 u_int length, u_int caplen)
 318 {
 319         switch (ether_type) {
 320
 321         case ETHERTYPE_IP:
 322                 ip_print(ndo, p, length);
 323                 return (1);
 324
 325         case ETHERTYPE_IPV6:
 326                 ip6_print(ndo, p, length);
 327                 return (1);
 328
 329         case ETHERTYPE_ARP:
 330         case ETHERTYPE_REVARP:
 331                 arp_print(ndo, p, length, caplen);
 332                 return (1);
 333
 334         case ETHERTYPE_DN:
 335                 decnet_print(ndo, p, length, caplen);
 336                 return (1);
 337
 338         case ETHERTYPE_ATALK:
 339                 if (ndo->ndo_vflag)
 340                         ND_PRINT((ndo, "et1 "));
 341                 atalk_print(ndo, p, length);
 342                 return (1);
 343
 344         case ETHERTYPE_AARP:
 345                 aarp_print(ndo, p, length);
 346                 return (1);
 347
 348         case ETHERTYPE_IPX:
 349                 ND_PRINT((ndo, "(NOV-ETHII) "));
 350                 ipx_print(ndo, p, length);
 351                 return (1);
 352
 353         case ETHERTYPE_ISO:
 354                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 355                 return(1);
 356
 357         case ETHERTYPE_PPPOED:
 358         case ETHERTYPE_PPPOES:
 359         case ETHERTYPE_PPPOED2:
 360         case ETHERTYPE_PPPOES2:
 361                 pppoe_print(ndo, p, length);
 362                 return (1);
 363
 364         case ETHERTYPE_EAPOL:
 365                 eap_print(ndo, p, length);
 366                 return (1);
 367
 368         case ETHERTYPE_RRCP:
 369                 rrcp_print(ndo, p - 14 , length + 14);
 370                 return (1);
 371
 372         case ETHERTYPE_PPP:
 373                 if (length) {
 374                         ND_PRINT((ndo, ": "));
 375                         ppp_print(ndo, p, length);
 376                 }
 377                 return (1);
 378
 379         case ETHERTYPE_MPCP:
 380                 mpcp_print(ndo, p, length);
 381                 return (1);
 382
 383         case ETHERTYPE_SLOW:
 384                 slow_print(ndo, p, length);
 385                 return (1);
 386
 387         case ETHERTYPE_CFM:
 388         case ETHERTYPE_CFM_OLD:
 389                 cfm_print(ndo, p, length);
 390                 return (1);
 391
 392         case ETHERTYPE_LLDP:
 393                 lldp_print(ndo, p, length);
 394                 return (1);
 395
 396         case ETHERTYPE_LOOPBACK:
 397                 loopback_print(ndo, p, length);
 398                 return (1);
 399
 400         case ETHERTYPE_MPLS:
 401         case ETHERTYPE_MPLS_MULTI:
 402                 mpls_print(ndo, p, length);
 403                 return (1);
 404
 405         case ETHERTYPE_TIPC:
 406                 tipc_print(ndo, p, length, caplen);
 407                 return (1);
 408
 409         case ETHERTYPE_MS_NLB_HB:
 410                 msnlb_print(ndo, p);
 411                 return (1);
 412
 413         case ETHERTYPE_GEONET_OLD:
 414         case ETHERTYPE_GEONET:
 415                 geonet_print(ndo, p-14, p, length);
 416                 return (1);
 417
 418         case ETHERTYPE_CALM_FAST:
 419                 calm_fast_print(ndo, p-14, p, length);
 420                 return (1);
 421
 422         case ETHERTYPE_AOE:
 423                 aoe_print(ndo, p, length);
 424                 return (1);
 425
 426         case ETHERTYPE_LAT:
 427         case ETHERTYPE_SCA:
 428         case ETHERTYPE_MOPRC:
 429         case ETHERTYPE_MOPDL:
 430         case ETHERTYPE_IEEE1905_1:
 431                 /* default_print for now */
 432         default:
 433                 return (0);
 434         }
 435 }
 436
 437
 438 /*
 439  * Local Variables:
 440  * c-style: whitesmith
 441  * c-basic-offset: 8
 442  * End:
 443  */
 444