contrib/tcpdump/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 1.105.2.1 2008-02-06 10:49:22 guy Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33 #include <pcap.h>
  34
  35 #include "interface.h"
  36 #include "addrtoname.h"
  37 #include "ethertype.h"
  38
  39 #include "ether.h"
  40
  41 const struct tok ethertype_values[] = {
  42     { ETHERTYPE_IP,             "IPv4" },
  43     { ETHERTYPE_MPLS,           "MPLS unicast" },
  44     { ETHERTYPE_MPLS_MULTI,     "MPLS multicast" },
  45     { ETHERTYPE_IPV6,           "IPv6" },
  46     { ETHERTYPE_8021Q,          "802.1Q" },
  47     { ETHERTYPE_VMAN,           "VMAN" },
  48     { ETHERTYPE_PUP,            "PUP" },
  49     { ETHERTYPE_ARP,            "ARP"},
  50     { ETHERTYPE_REVARP,         "Reverse ARP"},
  51     { ETHERTYPE_NS,             "NS" },
  52     { ETHERTYPE_SPRITE,         "Sprite" },
  53     { ETHERTYPE_TRAIL,          "Trail" },
  54     { ETHERTYPE_MOPDL,          "MOP DL" },
  55     { ETHERTYPE_MOPRC,          "MOP RC" },
  56     { ETHERTYPE_DN,             "DN" },
  57     { ETHERTYPE_LAT,            "LAT" },
  58     { ETHERTYPE_SCA,            "SCA" },
  59     { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
  60     { ETHERTYPE_DECDNS,         "DEC DNS" },
  61     { ETHERTYPE_DECDTS,         "DEC DTS" },
  62     { ETHERTYPE_VEXP,           "VEXP" },
  63     { ETHERTYPE_VPROD,          "VPROD" },
  64     { ETHERTYPE_ATALK,          "Appletalk" },
  65     { ETHERTYPE_AARP,           "Appletalk ARP" },
  66     { ETHERTYPE_IPX,            "IPX" },
  67     { ETHERTYPE_PPP,            "PPP" },
  68     { ETHERTYPE_MPCP,           "MPCP" },
  69     { ETHERTYPE_SLOW,           "Slow Protocols" },
  70     { ETHERTYPE_PPPOED,         "PPPoE D" },
  71     { ETHERTYPE_PPPOES,         "PPPoE S" },
  72     { ETHERTYPE_EAPOL,          "EAPOL" },
  73     { ETHERTYPE_RRCP,           "RRCP" },
  74     { ETHERTYPE_JUMBO,          "Jumbo" },
  75     { ETHERTYPE_LOOPBACK,       "Loopback" },
  76     { ETHERTYPE_ISO,            "OSI" },
  77     { ETHERTYPE_GRE_ISO,        "GRE-OSI" },
  78     { ETHERTYPE_CFM_OLD,        "CFM (old)" },
  79     { ETHERTYPE_CFM,            "CFM" },
  80     { ETHERTYPE_LLDP,           "LLDP" },
  81     { 0, NULL}
  82 };
  83
  84 static inline void
  85 ether_hdr_print(register const u_char *bp, u_int length)
  86 {
  87         register const struct ether_header *ep;
  88         ep = (const struct ether_header *)bp;
  89
  90         (void)printf("%s > %s",
  91                      etheraddr_string(ESRC(ep)),
  92                      etheraddr_string(EDST(ep)));
  93
  94         if (!qflag) {
  95                 if (ntohs(ep->ether_type) <= ETHERMTU)
  96                           (void)printf(", 802.3");
  97                 else
  98                           (void)printf(", ethertype %s (0x%04x)",
  99                                        tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
 100                                        ntohs(ep->ether_type));
 101         } else {
 102                 if (ntohs(ep->ether_type) <= ETHERMTU)
 103                           (void)printf(", 802.3");
 104                 else
 105                           (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
 106         }
 107
 108         (void)printf(", length %u: ", length);
 109 }
 110
 111 void
 112 ether_print(const u_char *p, u_int length, u_int caplen)
 113 {
 114         struct ether_header *ep;
 115         u_short ether_type;
 116         u_short extracted_ether_type;
 117
 118         if (caplen < ETHER_HDRLEN) {
 119                 printf("[|ether]");
 120                 return;
 121         }
 122
 123         if (eflag)
 124                 ether_hdr_print(p, length);
 125
 126         length -= ETHER_HDRLEN;
 127         caplen -= ETHER_HDRLEN;
 128         ep = (struct ether_header *)p;
 129         p += ETHER_HDRLEN;
 130
 131         ether_type = ntohs(ep->ether_type);
 132
 133         /*
 134          * Is it (gag) an 802.3 encapsulation?
 135          */
 136         if (ether_type <= ETHERMTU) {
 137                 /* Try to print the LLC-layer header & higher layers */
 138                 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
 139                     &extracted_ether_type) == 0) {
 140                         /* ether_type not known, print raw packet */
 141                         if (!eflag)
 142                                 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
 143
 144                         if (!suppress_default_print)
 145                                 default_print(p, caplen);
 146                 }
 147         } else if (ether_encap_print(ether_type, p, length, caplen,
 148             &extracted_ether_type) == 0) {
 149                 /* ether_type not known, print raw packet */
 150                 if (!eflag)
 151                         ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
 152
 153                 if (!suppress_default_print)
 154                         default_print(p, caplen);
 155         }
 156 }
 157
 158 /*
 159  * This is the top level routine of the printer.  'p' points
 160  * to the ether header of the packet, 'h->ts' is the timestamp,
 161  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 162  * is the number of bytes actually captured.
 163  */
 164 u_int
 165 ether_if_print(const struct pcap_pkthdr *h, const u_char *p)
 166 {
 167         ether_print(p, h->len, h->caplen);
 168
 169         return (ETHER_HDRLEN);
 170 }
 171
 172 /*
 173  * Prints the packet encapsulated in an Ethernet data segment
 174  * (or an equivalent encapsulation), given the Ethernet type code.
 175  *
 176  * Returns non-zero if it can do so, zero if the ethertype is unknown.
 177  *
 178  * The Ethernet type code is passed through a pointer; if it was
 179  * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
 180  * the 802.1Q payload, for the benefit of lower layers that might
 181  * want to know what it is.
 182  */
 183
 184 int
 185 ether_encap_print(u_short ether_type, const u_char *p,
 186     u_int length, u_int caplen, u_short *extracted_ether_type)
 187 {
 188  recurse:
 189         *extracted_ether_type = ether_type;
 190
 191         switch (ether_type) {
 192
 193         case ETHERTYPE_IP:
 194                 ip_print(gndo, p, length);
 195                 return (1);
 196
 197 #ifdef INET6
 198         case ETHERTYPE_IPV6:
 199                 ip6_print(p, length);
 200                 return (1);
 201 #endif /*INET6*/
 202
 203         case ETHERTYPE_ARP:
 204         case ETHERTYPE_REVARP:
 205                 arp_print(gndo, p, length, caplen);
 206                 return (1);
 207
 208         case ETHERTYPE_DN:
 209                 decnet_print(p, length, caplen);
 210                 return (1);
 211
 212         case ETHERTYPE_ATALK:
 213                 if (vflag)
 214                         fputs("et1 ", stdout);
 215                 atalk_print(p, length);
 216                 return (1);
 217
 218         case ETHERTYPE_AARP:
 219                 aarp_print(p, length);
 220                 return (1);
 221
 222         case ETHERTYPE_IPX:
 223                 printf("(NOV-ETHII) ");
 224                 ipx_print(p, length);
 225                 return (1);
 226
 227         case ETHERTYPE_8021Q:
 228                 if (eflag)
 229                     printf("vlan %u, p %u%s, ",
 230                            ntohs(*(u_int16_t *)p) & 0xfff,
 231                            ntohs(*(u_int16_t *)p) >> 13,
 232                            (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : "");
 233
 234                 ether_type = ntohs(*(u_int16_t *)(p + 2));
 235                 p += 4;
 236                 length -= 4;
 237                 caplen -= 4;
 238
 239                 if (ether_type > ETHERMTU) {
 240                         if (eflag)
 241                                 printf("ethertype %s, ",
 242                                        tok2str(ethertype_values,"0x%04x", ether_type));
 243                         goto recurse;
 244                 }
 245
 246                 *extracted_ether_type = 0;
 247
 248                 if (llc_print(p, length, caplen, p - 18, p - 12,
 249                     extracted_ether_type) == 0) {
 250                         ether_hdr_print(p - 18, length + 4);
 251
 252                         if (!suppress_default_print) {
 253                                 default_print(p - 18, caplen + 4);
 254                         }
 255                 }
 256
 257
 258                 return (1);
 259
 260         case ETHERTYPE_JUMBO:
 261                 ether_type = ntohs(*(u_int16_t *)(p));
 262                 p += 2;
 263                 length -= 2;
 264                 caplen -= 2;
 265
 266                 if (ether_type > ETHERMTU) {
 267                     if (eflag)
 268                         printf("ethertype %s, ",
 269                                tok2str(ethertype_values,"0x%04x", ether_type));
 270                     goto recurse;
 271                 }
 272
 273                 *extracted_ether_type = 0;
 274
 275                 if (llc_print(p, length, caplen, p - 16, p - 10,
 276                               extracted_ether_type) == 0) {
 277                     ether_hdr_print(p - 16, length + 2);
 278
 279                     if (!suppress_default_print) {
 280                             default_print(p - 16, caplen + 2);
 281                     }
 282                 }
 283
 284                 return (1);
 285
 286         case ETHERTYPE_ISO:
 287                 isoclns_print(p+1, length-1, length-1);
 288                 return(1);
 289
 290         case ETHERTYPE_PPPOED:
 291         case ETHERTYPE_PPPOES:
 292                 pppoe_print(p, length);
 293                 return (1);
 294
 295         case ETHERTYPE_EAPOL:
 296                 eap_print(gndo, p, length);
 297                 return (1);
 298
 299         case ETHERTYPE_RRCP:
 300                 rrcp_print(gndo, p - 14 , length + 14);
 301                 return (1);
 302
 303         case ETHERTYPE_PPP:
 304                 if (length) {
 305                         printf(": ");
 306                         ppp_print(p, length);
 307                 }
 308                 return (1);
 309
 310         case ETHERTYPE_MPCP:
 311                 mpcp_print(p, length);
 312                 return (1);
 313
 314         case ETHERTYPE_SLOW:
 315                 slow_print(p, length);
 316                 return (1);
 317
 318         case ETHERTYPE_CFM:
 319         case ETHERTYPE_CFM_OLD:
 320                 cfm_print(p, length);
 321                 return (1);
 322
 323         case ETHERTYPE_LLDP:
 324                 lldp_print(p, length);
 325                 return (1);
 326
 327         case ETHERTYPE_LOOPBACK:
 328                 return (1);
 329
 330         case ETHERTYPE_MPLS:
 331         case ETHERTYPE_MPLS_MULTI:
 332                 mpls_print(p, length);
 333                 return (1);
 334
 335         case ETHERTYPE_LAT:
 336         case ETHERTYPE_SCA:
 337         case ETHERTYPE_MOPRC:
 338         case ETHERTYPE_MOPDL:
 339                 /* default_print for now */
 340         default:
 341                 return (0);
 342         }
 343 }
 344
 345
 346 /*
 347  * Local Variables:
 348  * c-style: whitesmith
 349  * c-basic-offset: 8
 350  * End:
 351  */
 352