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