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 #define NETDISSECT_REWORKED
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include "interface.h"
  30 #include "extract.h"
  31 #include "addrtoname.h"
  32 #include "ethertype.h"
  33 #include "ether.h"
  34
  35 const struct tok ethertype_values[] = {
  36     { ETHERTYPE_IP,             "IPv4" },
  37     { ETHERTYPE_MPLS,           "MPLS unicast" },
  38     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  39     { ETHERTYPE_IPV6,           "IPv6" },
  40     { ETHERTYPE_8021Q,          "802.1Q" },
  41     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  42     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  43     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  44     { ETHERTYPE_VMAN,           "VMAN" },
  45     { ETHERTYPE_PUP,            "PUP" },
  46     { ETHERTYPE_ARP,            "ARP"},
  47     { ETHERTYPE_REVARP,         "Reverse ARP"},
  48     { ETHERTYPE_NS,             "NS" },
  49     { ETHERTYPE_SPRITE,         "Sprite" },
  50     { ETHERTYPE_TRAIL,          "Trail" },
  51     { ETHERTYPE_MOPDL,          "MOP DL" },
  52     { ETHERTYPE_MOPRC,          "MOP RC" },
  53     { ETHERTYPE_DN,             "DN" },
  54     { ETHERTYPE_LAT,            "LAT" },
  55     { ETHERTYPE_SCA,            "SCA" },
  56     { ETHERTYPE_TEB,            "TEB" },
  57     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  58     { ETHERTYPE_DECDNS,         "DEC DNS" },
  59     { ETHERTYPE_DECDTS,         "DEC DTS" },
  60     { ETHERTYPE_VEXP,           "VEXP" },
  61     { ETHERTYPE_VPROD,          "VPROD" },
  62     { ETHERTYPE_ATALK,          "Appletalk" },
  63     { ETHERTYPE_AARP,           "Appletalk ARP" },
  64     { ETHERTYPE_IPX,            "IPX" },
  65     { ETHERTYPE_PPP,            "PPP" },
  66     { ETHERTYPE_MPCP,           "MPCP" },
  67     { ETHERTYPE_SLOW,           "Slow Protocols" },
  68     { ETHERTYPE_PPPOED,         "PPPoE D" },
  69     { ETHERTYPE_PPPOES,         "PPPoE S" },
  70     { ETHERTYPE_EAPOL,          "EAPOL" },
  71     { ETHERTYPE_RRCP,           "RRCP" },
  72     { ETHERTYPE_MS_NLB_HB,      "MS NLB heartbeat" },
  73     { ETHERTYPE_JUMBO,          "Jumbo" },
  74     { ETHERTYPE_LOOPBACK,       "Loopback" },
  75     { ETHERTYPE_ISO,            "OSI" },
  76     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  77     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  78     { ETHERTYPE_CFM,            "CFM" },
  79     { ETHERTYPE_IEEE1905_1,     "IEEE1905.1" },
  80     { ETHERTYPE_LLDP,           "LLDP" },
  81     { ETHERTYPE_TIPC,           "TIPC"},
  82     { ETHERTYPE_GEONET_OLD,     "GeoNet (old)"},
  83     { ETHERTYPE_GEONET,         "GeoNet"},
  84     { ETHERTYPE_CALM_FAST,      "CALM FAST"},
  85     { ETHERTYPE_AOE,            "AoE" },
  86     { 0, NULL}
  87 };
  88
  89 static inline void
  90 ether_hdr_print(netdissect_options *ndo,
  91                 const u_char *bp, u_int length)
  92 {
  93         register const struct ether_header *ep;
  94         uint16_t ether_type;
  95
  96         ep = (const struct ether_header *)bp;
  97
  98         ND_PRINT((ndo, "%s > %s",
  99                      etheraddr_string(ndo, ESRC(ep)),
 100                      etheraddr_string(ndo, EDST(ep))));
 101
 102         ether_type = EXTRACT_16BITS(&ep->ether_type);
 103         if (!ndo->ndo_qflag) {
 104                 if (ether_type <= ETHERMTU)
 105                           ND_PRINT((ndo, ", 802.3"));
 106                 else
 107                           ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 108                                        tok2str(ethertype_values,"Unknown", ether_type),
 109                                        ether_type));
 110         } else {
 111                 if (ether_type <= ETHERMTU)
 112                           ND_PRINT((ndo, ", 802.3"));
 113                 else
 114                           ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 115         }
 116
 117         ND_PRINT((ndo, ", length %u: ", length));
 118 }
 119
 120 /*
 121  * Print an Ethernet frame.
 122  * This might be encapsulated within another frame; we might be passed
 123  * a pointer to a function that can print header information for that
 124  * frame's protocol, and an argument to pass to that function.
 125  */
 126 void
 127 ether_print(netdissect_options *ndo,
 128             const u_char *p, u_int length, u_int caplen,
 129             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 130 {
 131         struct ether_header *ep;
 132         u_int orig_length;
 133         u_short ether_type;
 134         u_short extracted_ether_type;
 135
 136         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 137                 ND_PRINT((ndo, "[|ether]"));
 138                 return;
 139         }
 140
 141         if (ndo->ndo_eflag) {
 142                 if (print_encap_header != NULL)
 143                         (*print_encap_header)(ndo, encap_header_arg);
 144                 ether_hdr_print(ndo, p, length);
 145         }
 146         orig_length = length;
 147
 148         length -= ETHER_HDRLEN;
 149         caplen -= ETHER_HDRLEN;
 150         ep = (struct ether_header *)p;
 151         p += ETHER_HDRLEN;
 152
 153         ether_type = EXTRACT_16BITS(&ep->ether_type);
 154
 155 recurse:
 156         /*
 157          * Is it (gag) an 802.3 encapsulation?
 158          */
 159         if (ether_type <= ETHERMTU) {
 160                 /* Try to print the LLC-layer header & higher layers */
 161                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 162                     &extracted_ether_type) == 0) {
 163                         /* ether_type not known, print raw packet */
 164                         if (!ndo->ndo_eflag) {
 165                                 if (print_encap_header != NULL)
 166                                         (*print_encap_header)(ndo, encap_header_arg);
 167                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 168                         }
 169
 170                         if (!ndo->ndo_suppress_default_print)
 171                                 ND_DEFAULTPRINT(p, caplen);
 172                 }
 173         } else if (ether_type == ETHERTYPE_8021Q  ||
 174                 ether_type == ETHERTYPE_8021Q9100 ||
 175                 ether_type == ETHERTYPE_8021Q9200 ||
 176                 ether_type == ETHERTYPE_8021QinQ) {
 177                 /*
 178                  * Print VLAN information, and then go back and process
 179                  * the enclosed type field.
 180                  */
 181                 if (caplen < 4 || length < 4) {
 182                         ND_PRINT((ndo, "[|vlan]"));
 183                         return;
 184                 }
 185                 if (ndo->ndo_eflag) {
 186                         uint16_t tag = EXTRACT_16BITS(p);
 187
 188                         ND_PRINT((ndo, "vlan %u, p %u%s, ",
 189                             tag & 0xfff,
 190                             tag >> 13,
 191                             (tag & 0x1000) ? ", CFI" : ""));
 192                 }
 193
 194                 ether_type = EXTRACT_16BITS(p + 2);
 195                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 196                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 197                 p += 4;
 198                 length -= 4;
 199                 caplen -= 4;
 200                 goto recurse;
 201         } else if (ether_type == ETHERTYPE_JUMBO) {
 202                 /*
 203                  * Alteon jumbo frames.
 204                  * See
 205                  *
 206                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 207                  *
 208                  * which indicates that, following the type field,
 209                  * there's an LLC header and payload.
 210                  */
 211                 /* Try to print the LLC-layer header & higher layers */
 212                 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep),
 213                     &extracted_ether_type) == 0) {
 214                         /* ether_type not known, print raw packet */
 215                         if (!ndo->ndo_eflag) {
 216                                 if (print_encap_header != NULL)
 217                                         (*print_encap_header)(ndo, encap_header_arg);
 218                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 219                         }
 220
 221                         if (!ndo->ndo_suppress_default_print)
 222                                 ND_DEFAULTPRINT(p, caplen);
 223                 }
 224         } else {
 225                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 226                         /* ether_type not known, print raw packet */
 227                         if (!ndo->ndo_eflag) {
 228                                 if (print_encap_header != NULL)
 229                                         (*print_encap_header)(ndo, encap_header_arg);
 230                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 231                         }
 232
 233                         if (!ndo->ndo_suppress_default_print)
 234                                 ND_DEFAULTPRINT(p, caplen);
 235                 }
 236         }
 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         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 250
 251         return (ETHER_HDRLEN);
 252 }
 253
 254 /*
 255  * This is the top level routine of the printer.  'p' points
 256  * to the ether header of the packet, 'h->ts' is the timestamp,
 257  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 258  * is the number of bytes actually captured.
 259  *
 260  * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
 261  * before the Ethernet header.
 262  */
 263 u_int
 264 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 265                      const u_char *p)
 266 {
 267         /*
 268          * Fail if we don't have enough data for the Hilscher pseudo-header.
 269          */
 270         if (h->len < 4 || h->caplen < 4) {
 271                 ND_PRINT((ndo, "[|netanalyzer]"));
 272                 return (h->caplen);
 273         }
 274
 275         /* Skip the pseudo-header. */
 276         ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
 277
 278         return (4 + ETHER_HDRLEN);
 279 }
 280
 281 /*
 282  * This is the top level routine of the printer.  'p' points
 283  * to the ether header of the packet, 'h->ts' is the timestamp,
 284  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 285  * is the number of bytes actually captured.
 286  *
 287  * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
 288  * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
 289  * before the Ethernet header.
 290  */
 291 u_int
 292 netanalyzer_transparent_if_print(netdissect_options *ndo,
 293                                  const struct pcap_pkthdr *h,
 294                                  const u_char *p)
 295 {
 296         /*
 297          * Fail if we don't have enough data for the Hilscher pseudo-header,
 298          * preamble, and SOF.
 299          */
 300         if (h->len < 12 || h->caplen < 12) {
 301                 ND_PRINT((ndo, "[|netanalyzer-transparent]"));
 302                 return (h->caplen);
 303         }
 304
 305         /* Skip the pseudo-header, preamble, and SOF. */
 306         ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
 307
 308         return (12 + ETHER_HDRLEN);
 309 }
 310
 311 /*
 312  * Prints the packet payload, given an Ethernet type code for the payload's
 313  * protocol.
 314  *
 315  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 316  */
 317
 318 int
 319 ethertype_print(netdissect_options *ndo,
 320                 u_short ether_type, const u_char *p,
 321                 u_int length, u_int caplen)
 322 {
 323         switch (ether_type) {
 324
 325         case ETHERTYPE_IP:
 326                 ip_print(ndo, p, length);
 327                 return (1);
 328
 329 #ifdef INET6
 330         case ETHERTYPE_IPV6:
 331                 ip6_print(ndo, p, length);
 332                 return (1);
 333 #endif /*INET6*/
 334
 335         case ETHERTYPE_ARP:
 336         case ETHERTYPE_REVARP:
 337                 arp_print(ndo, p, length, caplen);
 338                 return (1);
 339
 340         case ETHERTYPE_DN:
 341                 decnet_print(ndo, p, length, caplen);
 342                 return (1);
 343
 344         case ETHERTYPE_ATALK:
 345                 if (ndo->ndo_vflag)
 346                         ND_PRINT((ndo, "et1 "));
 347                 atalk_print(ndo, p, length);
 348                 return (1);
 349
 350         case ETHERTYPE_AARP:
 351                 aarp_print(ndo, p, length);
 352                 return (1);
 353
 354         case ETHERTYPE_IPX:
 355                 ND_PRINT((ndo, "(NOV-ETHII) "));
 356                 ipx_print(ndo, p, length);
 357                 return (1);
 358
 359         case ETHERTYPE_ISO:
 360                 isoclns_print(ndo, p + 1, length - 1, length - 1);
 361                 return(1);
 362
 363         case ETHERTYPE_PPPOED:
 364         case ETHERTYPE_PPPOES:
 365         case ETHERTYPE_PPPOED2:
 366         case ETHERTYPE_PPPOES2:
 367                 pppoe_print(ndo, p, length);
 368                 return (1);
 369
 370         case ETHERTYPE_EAPOL:
 371                 eap_print(ndo, p, length);
 372                 return (1);
 373
 374         case ETHERTYPE_RRCP:
 375                 rrcp_print(ndo, p - 14 , length + 14);
 376                 return (1);
 377
 378         case ETHERTYPE_PPP:
 379                 if (length) {
 380                         ND_PRINT((ndo, ": "));
 381                         ppp_print(ndo, p, length);
 382                 }
 383                 return (1);
 384
 385         case ETHERTYPE_MPCP:
 386                 mpcp_print(ndo, p, length);
 387                 return (1);
 388
 389         case ETHERTYPE_SLOW:
 390                 slow_print(ndo, p, length);
 391                 return (1);
 392
 393         case ETHERTYPE_CFM:
 394         case ETHERTYPE_CFM_OLD:
 395                 cfm_print(ndo, p, length);
 396                 return (1);
 397
 398         case ETHERTYPE_LLDP:
 399                 lldp_print(ndo, p, length);
 400                 return (1);
 401
 402         case ETHERTYPE_LOOPBACK:
 403                 loopback_print(ndo, p, length);
 404                 return (1);
 405
 406         case ETHERTYPE_MPLS:
 407         case ETHERTYPE_MPLS_MULTI:
 408                 mpls_print(ndo, p, length);
 409                 return (1);
 410
 411         case ETHERTYPE_TIPC:
 412                 tipc_print(ndo, p, length, caplen);
 413                 return (1);
 414
 415         case ETHERTYPE_MS_NLB_HB:
 416                 msnlb_print(ndo, p);
 417                 return (1);
 418
 419         case ETHERTYPE_GEONET_OLD:
 420         case ETHERTYPE_GEONET:
 421                 geonet_print(ndo, p-14, p, length);
 422                 return (1);
 423
 424         case ETHERTYPE_CALM_FAST:
 425                 calm_fast_print(ndo, p-14, p, length);
 426                 return (1);
 427
 428         case ETHERTYPE_AOE:
 429                 aoe_print(ndo, p, length);
 430                 return (1);
 431
 432         case ETHERTYPE_LAT:
 433         case ETHERTYPE_SCA:
 434         case ETHERTYPE_MOPRC:
 435         case ETHERTYPE_MOPDL:
 436         case ETHERTYPE_IEEE1905_1:
 437                 /* default_print for now */
 438         default:
 439                 return (0);
 440         }
 441 }
 442
 443
 444 /*
 445  * Local Variables:
 446  * c-style: whitesmith
 447  * c-basic-offset: 8
 448  * End:
 449  */
 450