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 #ifndef lint
  22 static const char rcsid[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp $ (LBL)";
  24 #endif
  25
  26 #define NETDISSECT_REWORKED
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <stdio.h>
  34 #include <pcap.h>
  35
  36 #include "interface.h"
  37 #include "extract.h"
  38 #include "addrtoname.h"
  39 #include "ethertype.h"
  40
  41 #include "ether.h"
  42
  43 const struct tok ethertype_values[] = {
  44     { ETHERTYPE_IP,             "IPv4" },
  45     { ETHERTYPE_MPLS,           "MPLS unicast" },
  46     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  47     { ETHERTYPE_IPV6,           "IPv6" },
  48     { ETHERTYPE_8021Q,          "802.1Q" },
  49     { ETHERTYPE_8021Q9100,      "802.1Q-9100" },
  50     { ETHERTYPE_8021QinQ,       "802.1Q-QinQ" },
  51     { ETHERTYPE_8021Q9200,      "802.1Q-9200" },
  52     { ETHERTYPE_VMAN,           "VMAN" },
  53     { ETHERTYPE_PUP,            "PUP" },
  54     { ETHERTYPE_ARP,            "ARP"},
  55     { ETHERTYPE_REVARP,         "Reverse ARP"},
  56     { ETHERTYPE_NS,             "NS" },
  57     { ETHERTYPE_SPRITE,         "Sprite" },
  58     { ETHERTYPE_TRAIL,          "Trail" },
  59     { ETHERTYPE_MOPDL,          "MOP DL" },
  60     { ETHERTYPE_MOPRC,          "MOP RC" },
  61     { ETHERTYPE_DN,             "DN" },
  62     { ETHERTYPE_LAT,            "LAT" },
  63     { ETHERTYPE_SCA,            "SCA" },
  64     { ETHERTYPE_TEB,            "TEB" },
  65     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  66     { ETHERTYPE_DECDNS,         "DEC DNS" },
  67     { ETHERTYPE_DECDTS,         "DEC DTS" },
  68     { ETHERTYPE_VEXP,           "VEXP" },
  69     { ETHERTYPE_VPROD,          "VPROD" },
  70     { ETHERTYPE_ATALK,          "Appletalk" },
  71     { ETHERTYPE_AARP,           "Appletalk ARP" },
  72     { ETHERTYPE_IPX,            "IPX" },
  73     { ETHERTYPE_PPP,            "PPP" },
  74     { ETHERTYPE_MPCP,           "MPCP" },
  75     { ETHERTYPE_SLOW,           "Slow Protocols" },
  76     { ETHERTYPE_PPPOED,         "PPPoE D" },
  77     { ETHERTYPE_PPPOES,         "PPPoE S" },
  78     { ETHERTYPE_EAPOL,          "EAPOL" },
  79     { ETHERTYPE_RRCP,           "RRCP" },
  80     { ETHERTYPE_JUMBO,          "Jumbo" },
  81     { ETHERTYPE_LOOPBACK,       "Loopback" },
  82     { ETHERTYPE_ISO,            "OSI" },
  83     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  84     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  85     { ETHERTYPE_CFM,            "CFM" },
  86     { ETHERTYPE_LLDP,           "LLDP" },
  87     { 0, NULL}
  88 };
  89
  90 static inline void
  91 ether_hdr_print(netdissect_options *ndo,
  92                 const u_char *bp, u_int length)
  93 {
  94         register const struct ether_header *ep;
  95         u_int16_t ether_type;
  96
  97         ep = (const struct ether_header *)bp;
  98
  99         (void)ND_PRINT((ndo, "%s > %s",
 100                      etheraddr_string(ESRC(ep)),
 101                      etheraddr_string(EDST(ep))));
 102
 103         ether_type = EXTRACT_16BITS(&ep->ether_type);
 104         if (!ndo->ndo_qflag) {
 105                 if (ether_type <= ETHERMTU)
 106                           (void)ND_PRINT((ndo, ", 802.3"));
 107                 else
 108                           (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
 109                                        tok2str(ethertype_values,"Unknown", ether_type),
 110                                        ether_type));
 111         } else {
 112                 if (ether_type <= ETHERMTU)
 113                           (void)ND_PRINT((ndo, ", 802.3"));
 114                 else
 115                           (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
 116         }
 117
 118         (void)ND_PRINT((ndo, ", length %u: ", length));
 119 }
 120
 121 /*
 122  * Print an Ethernet frame.
 123  * This might be encapsulated within another frame; we might be passed
 124  * a pointer to a function that can print header information for that
 125  * frame's protocol, and an argument to pass to that function.
 126  */
 127 void
 128 ether_print(netdissect_options *ndo,
 129             const u_char *p, u_int length, u_int caplen,
 130             void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
 131 {
 132         struct ether_header *ep;
 133         u_int orig_length;
 134         u_short ether_type;
 135         u_short extracted_ether_type;
 136
 137         if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
 138                 ND_PRINT((ndo, "[|ether]"));
 139                 return;
 140         }
 141
 142         if (ndo->ndo_eflag) {
 143                 if (print_encap_header != NULL)
 144                         (*print_encap_header)(ndo, encap_header_arg);
 145                 ether_hdr_print(ndo, p, length);
 146         }
 147         orig_length = length;
 148
 149         length -= ETHER_HDRLEN;
 150         caplen -= ETHER_HDRLEN;
 151         ep = (struct ether_header *)p;
 152         p += ETHER_HDRLEN;
 153
 154         ether_type = EXTRACT_16BITS(&ep->ether_type);
 155
 156 recurse:
 157         /*
 158          * Is it (gag) an 802.3 encapsulation?
 159          */
 160         if (ether_type <= ETHERMTU) {
 161                 /* Try to print the LLC-layer header & higher layers */
 162                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 163                     &extracted_ether_type) == 0) {
 164                         /* ether_type not known, print raw packet */
 165                         if (!ndo->ndo_eflag) {
 166                                 if (print_encap_header != NULL)
 167                                         (*print_encap_header)(ndo, encap_header_arg);
 168                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 169                         }
 170
 171                         if (!ndo->ndo_suppress_default_print)
 172                                 ndo->ndo_default_print(ndo, p, caplen);
 173                 }
 174         } else if (ether_type == ETHERTYPE_8021Q  ||
 175                 ether_type == ETHERTYPE_8021Q9100 ||
 176                 ether_type == ETHERTYPE_8021Q9200 ||
 177                 ether_type == ETHERTYPE_8021QinQ) {
 178                 /*
 179                  * Print VLAN information, and then go back and process
 180                  * the enclosed type field.
 181                  */
 182                 if (caplen < 4 || length < 4) {
 183                         ND_PRINT((ndo, "[|vlan]"));
 184                         return;
 185                 }
 186                 if (ndo->ndo_eflag) {
 187                         u_int16_t tag = EXTRACT_16BITS(p);
 188
 189                         ND_PRINT((ndo, "vlan %u, p %u%s, ",
 190                             tag & 0xfff,
 191                             tag >> 13,
 192                             (tag & 0x1000) ? ", CFI" : ""));
 193                 }
 194
 195                 ether_type = EXTRACT_16BITS(p + 2);
 196                 if (ndo->ndo_eflag && ether_type > ETHERMTU)
 197                         ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
 198                 p += 4;
 199                 length -= 4;
 200                 caplen -= 4;
 201                 goto recurse;
 202         } else if (ether_type == ETHERTYPE_JUMBO) {
 203                 /*
 204                  * Alteon jumbo frames.
 205                  * See
 206                  *
 207                  *      http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
 208                  *
 209                  * which indicates that, following the type field,
 210                  * there's an LLC header and payload.
 211                  */
 212                 /* Try to print the LLC-layer header & higher layers */
 213                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 214                     &extracted_ether_type) == 0) {
 215                         /* ether_type not known, print raw packet */
 216                         if (!ndo->ndo_eflag) {
 217                                 if (print_encap_header != NULL)
 218                                         (*print_encap_header)(ndo, encap_header_arg);
 219                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 220                         }
 221
 222                         if (!ndo->ndo_suppress_default_print)
 223                                 ndo->ndo_default_print(ndo, p, caplen);
 224                 }
 225         } else {
 226                 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 227                         /* ether_type not known, print raw packet */
 228                         if (!ndo->ndo_eflag) {
 229                                 if (print_encap_header != NULL)
 230                                         (*print_encap_header)(ndo, encap_header_arg);
 231                                 ether_hdr_print(ndo, (u_char *)ep, orig_length);
 232                         }
 233
 234                         if (!ndo->ndo_suppress_default_print)
 235                                 ndo->ndo_default_print(ndo, p, caplen);
 236                 }
 237         }
 238 }
 239
 240 /*
 241  * This is the top level routine of the printer.  'p' points
 242  * to the ether header of the packet, 'h->ts' is the timestamp,
 243  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 244  * is the number of bytes actually captured.
 245  */
 246 u_int
 247 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 248                const u_char *p)
 249 {
 250         ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
 251
 252         return (ETHER_HDRLEN);
 253 }
 254
 255 /*
 256  * Prints the packet payload, given an Ethernet type code for the payload's
 257  * protocol.
 258  *
 259  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 260  */
 261
 262 int
 263 ethertype_print(netdissect_options *ndo,
 264                 u_short ether_type, const u_char *p,
 265                 u_int length, u_int caplen)
 266 {
 267         switch (ether_type) {
 268
 269         case ETHERTYPE_IP:
 270                 ip_print(ndo, p, length);
 271                 return (1);
 272
 273 #ifdef INET6
 274         case ETHERTYPE_IPV6:
 275                 ip6_print(ndo, p, length);
 276                 return (1);
 277 #endif /*INET6*/
 278
 279         case ETHERTYPE_ARP:
 280         case ETHERTYPE_REVARP:
 281                 arp_print(ndo, p, length, caplen);
 282                 return (1);
 283
 284         case ETHERTYPE_DN:
 285                 decnet_print(/*ndo,*/p, length, caplen);
 286                 return (1);
 287
 288         case ETHERTYPE_ATALK:
 289                 if (ndo->ndo_vflag)
 290                         fputs("et1 ", stdout);
 291                 atalk_print(/*ndo,*/p, length);
 292                 return (1);
 293
 294         case ETHERTYPE_AARP:
 295                 aarp_print(/*ndo,*/p, length);
 296                 return (1);
 297
 298         case ETHERTYPE_IPX:
 299                 ND_PRINT((ndo, "(NOV-ETHII) "));
 300                 ipx_print(/*ndo,*/p, length);
 301                 return (1);
 302
 303         case ETHERTYPE_ISO:
 304                 isoclns_print(/*ndo,*/p+1, length-1, length-1);
 305                 return(1);
 306
 307         case ETHERTYPE_PPPOED:
 308         case ETHERTYPE_PPPOES:
 309         case ETHERTYPE_PPPOED2:
 310         case ETHERTYPE_PPPOES2:
 311                 pppoe_print(/*ndo,*/p, length);
 312                 return (1);
 313
 314         case ETHERTYPE_EAPOL:
 315                 eap_print(ndo, p, length);
 316                 return (1);
 317
 318         case ETHERTYPE_RRCP:
 319                 rrcp_print(ndo, p - 14 , length + 14);
 320                 return (1);
 321
 322         case ETHERTYPE_PPP:
 323                 if (length) {
 324                         printf(": ");
 325                         ppp_print(/*ndo,*/p, length);
 326                 }
 327                 return (1);
 328
 329         case ETHERTYPE_MPCP:
 330                 mpcp_print(/*ndo,*/p, length);
 331                 return (1);
 332
 333         case ETHERTYPE_SLOW:
 334                 slow_print(/*ndo,*/p, length);
 335                 return (1);
 336
 337         case ETHERTYPE_CFM:
 338         case ETHERTYPE_CFM_OLD:
 339                 cfm_print(/*ndo,*/p, length);
 340                 return (1);
 341
 342         case ETHERTYPE_LLDP:
 343                 lldp_print(/*ndo,*/p, length);
 344                 return (1);
 345
 346         case ETHERTYPE_LOOPBACK:
 347                 return (1);
 348
 349         case ETHERTYPE_MPLS:
 350         case ETHERTYPE_MPLS_MULTI:
 351                 mpls_print(/*ndo,*/p, length);
 352                 return (1);
 353
 354         case ETHERTYPE_LAT:
 355         case ETHERTYPE_SCA:
 356         case ETHERTYPE_MOPRC:
 357         case ETHERTYPE_MOPDL:
 358                 /* default_print for now */
 359         default:
 360                 return (0);
 361         }
 362 }
 363
 364
 365 /*
 366  * Local Variables:
 367  * c-style: whitesmith
 368  * c-basic-offset: 8
 369  * End:
 370  */
 371