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 22static 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#include "ether.h" 41 42const struct tok ethertype_values[] = { 43 { ETHERTYPE_IP, "IPv4" }, 44 { ETHERTYPE_MPLS, "MPLS unicast" }, 45 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 46 { ETHERTYPE_IPV6, "IPv6" }, 47 { ETHERTYPE_8021Q, "802.1Q" }, 48 { ETHERTYPE_8021Q9100, "802.1Q-9100" }, 49 { ETHERTYPE_8021QinQ, "802.1Q-QinQ" }, 50 { ETHERTYPE_8021Q9200, "802.1Q-9200" }, 51 { ETHERTYPE_VMAN, "VMAN" }, 52 { ETHERTYPE_PUP, "PUP" }, 53 { ETHERTYPE_ARP, "ARP"}, 54 { ETHERTYPE_REVARP, "Reverse ARP"}, 55 { ETHERTYPE_NS, "NS" }, 56 { ETHERTYPE_SPRITE, "Sprite" }, 57 { ETHERTYPE_TRAIL, "Trail" }, 58 { ETHERTYPE_MOPDL, "MOP DL" }, 59 { ETHERTYPE_MOPRC, "MOP RC" }, 60 { ETHERTYPE_DN, "DN" }, 61 { ETHERTYPE_LAT, "LAT" }, 62 { ETHERTYPE_SCA, "SCA" }, 63 { ETHERTYPE_TEB, "TEB" }, 64 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 65 { ETHERTYPE_DECDNS, "DEC DNS" }, 66 { ETHERTYPE_DECDTS, "DEC DTS" }, 67 { ETHERTYPE_VEXP, "VEXP" }, 68 { ETHERTYPE_VPROD, "VPROD" }, 69 { ETHERTYPE_ATALK, "Appletalk" }, 70 { ETHERTYPE_AARP, "Appletalk ARP" }, 71 { ETHERTYPE_IPX, "IPX" }, 72 { ETHERTYPE_PPP, "PPP" }, 73 { ETHERTYPE_MPCP, "MPCP" }, 74 { ETHERTYPE_SLOW, "Slow Protocols" }, 75 { ETHERTYPE_PPPOED, "PPPoE D" }, 76 { ETHERTYPE_PPPOES, "PPPoE S" }, 77 { ETHERTYPE_EAPOL, "EAPOL" }, 78 { ETHERTYPE_RRCP, "RRCP" }, 79 { ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" }, 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 { ETHERTYPE_TIPC, "TIPC"}, 88 { 0, NULL} 89}; 90 91static inline void 92ether_hdr_print(netdissect_options *ndo, 93 const u_char *bp, u_int length) 94{ 95 register const struct ether_header *ep; 96 u_int16_t ether_type; 97 98 ep = (const struct ether_header *)bp; 99 100 (void)ND_PRINT((ndo, "%s > %s", 101 etheraddr_string(ESRC(ep)), 102 etheraddr_string(EDST(ep)))); 103 104 ether_type = EXTRACT_16BITS(&ep->ether_type); 105 if (!ndo->ndo_qflag) { 106 if (ether_type <= ETHERMTU) 107 (void)ND_PRINT((ndo, ", 802.3")); 108 else 109 (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)", 110 tok2str(ethertype_values,"Unknown", ether_type), 111 ether_type)); 112 } else { 113 if (ether_type <= ETHERMTU) 114 (void)ND_PRINT((ndo, ", 802.3")); 115 else 116 (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type))); 117 } 118 119 (void)ND_PRINT((ndo, ", length %u: ", length)); 120} 121 122/* 123 * Print an Ethernet frame. 124 * This might be encapsulated within another frame; we might be passed 125 * a pointer to a function that can print header information for that 126 * frame's protocol, and an argument to pass to that function. 127 */ 128void 129ether_print(netdissect_options *ndo, 130 const u_char *p, u_int length, u_int caplen, 131 void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg) 132{ 133 struct ether_header *ep; 134 u_int orig_length; 135 u_short ether_type; 136 u_short extracted_ether_type; 137 138 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 139 ND_PRINT((ndo, "[|ether]")); 140 return; 141 } 142 143 if (ndo->ndo_eflag) { 144 if (print_encap_header != NULL) 145 (*print_encap_header)(ndo, encap_header_arg); 146 ether_hdr_print(ndo, p, length); 147 } 148 orig_length = length; 149 150 length -= ETHER_HDRLEN; 151 caplen -= ETHER_HDRLEN; 152 ep = (struct ether_header *)p; 153 p += ETHER_HDRLEN; 154 155 ether_type = EXTRACT_16BITS(&ep->ether_type); 156 157recurse: 158 /* 159 * Is it (gag) an 802.3 encapsulation? 160 */ 161 if (ether_type <= ETHERMTU) { 162 /* Try to print the LLC-layer header & higher layers */ 163 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 164 &extracted_ether_type) == 0) { 165 /* ether_type not known, print raw packet */ 166 if (!ndo->ndo_eflag) { 167 if (print_encap_header != NULL) 168 (*print_encap_header)(ndo, encap_header_arg); 169 ether_hdr_print(ndo, (u_char *)ep, orig_length); 170 } 171 172 if (!ndo->ndo_suppress_default_print) 173 ndo->ndo_default_print(ndo, p, caplen); 174 } 175 } else if (ether_type == ETHERTYPE_8021Q || 176 ether_type == ETHERTYPE_8021Q9100 || 177 ether_type == ETHERTYPE_8021Q9200 || 178 ether_type == ETHERTYPE_8021QinQ) { 179 /* 180 * Print VLAN information, and then go back and process 181 * the enclosed type field. 182 */ 183 if (caplen < 4 || length < 4) { 184 ND_PRINT((ndo, "[|vlan]")); 185 return; 186 } 187 if (ndo->ndo_eflag) { 188 u_int16_t tag = EXTRACT_16BITS(p); 189 190 ND_PRINT((ndo, "vlan %u, p %u%s, ", 191 tag & 0xfff, 192 tag >> 13, 193 (tag & 0x1000) ? ", CFI" : "")); 194 } 195 196 ether_type = EXTRACT_16BITS(p + 2); 197 if (ndo->ndo_eflag && ether_type > ETHERMTU) 198 ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type))); 199 p += 4; 200 length -= 4; 201 caplen -= 4; 202 goto recurse; 203 } else if (ether_type == ETHERTYPE_JUMBO) { 204 /* 205 * Alteon jumbo frames. 206 * See 207 * 208 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 209 * 210 * which indicates that, following the type field, 211 * there's an LLC header and payload. 212 */ 213 /* Try to print the LLC-layer header & higher layers */ 214 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 215 &extracted_ether_type) == 0) { 216 /* ether_type not known, print raw packet */ 217 if (!ndo->ndo_eflag) { 218 if (print_encap_header != NULL) 219 (*print_encap_header)(ndo, encap_header_arg); 220 ether_hdr_print(ndo, (u_char *)ep, orig_length); 221 } 222 223 if (!ndo->ndo_suppress_default_print) 224 ndo->ndo_default_print(ndo, p, caplen); 225 } 226 } else { 227 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) { 228 /* ether_type not known, print raw packet */ 229 if (!ndo->ndo_eflag) { 230 if (print_encap_header != NULL) 231 (*print_encap_header)(ndo, encap_header_arg); 232 ether_hdr_print(ndo, (u_char *)ep, orig_length); 233 } 234 235 if (!ndo->ndo_suppress_default_print) 236 ndo->ndo_default_print(ndo, p, caplen); 237 } 238 } 239} 240 241/* 242 * This is the top level routine of the printer. 'p' points 243 * to the ether header of the packet, 'h->ts' is the timestamp, 244 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 245 * is the number of bytes actually captured. 246 */ 247u_int 248ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 249 const u_char *p) 250{ 251 ether_print(ndo, p, h->len, h->caplen, NULL, NULL); 252 253 return (ETHER_HDRLEN); 254} 255 256/* 257 * This is the top level routine of the printer. 'p' points 258 * to the ether header of the packet, 'h->ts' is the timestamp, 259 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 260 * is the number of bytes actually captured. 261 * 262 * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header 263 * before the Ethernet header. 264 */ 265u_int 266netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 267 const u_char *p) 268{ 269 /* 270 * Fail if we don't have enough data for the Hilscher pseudo-header. 271 */ 272 if (h->len < 4 || h->caplen < 4) { 273 printf("[|netanalyzer]"); 274 return (h->caplen); 275 } 276 277 /* Skip the pseudo-header. */ 278 ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL); 279 280 return (4 + ETHER_HDRLEN); 281} 282 283/* 284 * This is the top level routine of the printer. 'p' points 285 * to the ether header of the packet, 'h->ts' is the timestamp, 286 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 287 * is the number of bytes actually captured. 288 * 289 * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte 290 * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF 291 * before the Ethernet header. 292 */ 293u_int 294netanalyzer_transparent_if_print(netdissect_options *ndo, 295 const struct pcap_pkthdr *h, 296 const u_char *p) 297{ 298 /* 299 * Fail if we don't have enough data for the Hilscher pseudo-header, 300 * preamble, and SOF. 301 */ 302 if (h->len < 12 || h->caplen < 12) { 303 printf("[|netanalyzer-transparent]"); 304 return (h->caplen); 305 } 306 307 /* Skip the pseudo-header, preamble, and SOF. */ 308 ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL); 309 310 return (12 + ETHER_HDRLEN); 311} 312 313/* 314 * Prints the packet payload, given an Ethernet type code for the payload's 315 * protocol. 316 * 317 * Returns non-zero if it can do so, zero if the ethertype is unknown. 318 */ 319 320int 321ethertype_print(netdissect_options *ndo, 322 u_short ether_type, const u_char *p, 323 u_int length, u_int caplen) 324{ 325 switch (ether_type) { 326 327 case ETHERTYPE_IP: 328 ip_print(ndo, p, length); 329 return (1); 330 331#ifdef INET6 332 case ETHERTYPE_IPV6: 333 ip6_print(ndo, p, length); 334 return (1); 335#endif /*INET6*/ 336 337 case ETHERTYPE_ARP: 338 case ETHERTYPE_REVARP: 339 arp_print(ndo, p, length, caplen); 340 return (1); 341 342 case ETHERTYPE_DN: 343 decnet_print(/*ndo,*/p, length, caplen); 344 return (1); 345 346 case ETHERTYPE_ATALK: 347 if (ndo->ndo_vflag) 348 fputs("et1 ", stdout); 349 atalk_print(/*ndo,*/p, length); 350 return (1); 351 352 case ETHERTYPE_AARP: 353 aarp_print(/*ndo,*/p, length); 354 return (1); 355 356 case ETHERTYPE_IPX: 357 ND_PRINT((ndo, "(NOV-ETHII) ")); 358 ipx_print(/*ndo,*/p, length); 359 return (1); 360 361 case ETHERTYPE_ISO: 362 isoclns_print(/*ndo,*/p+1, length-1, length-1); 363 return(1); 364 365 case ETHERTYPE_PPPOED: 366 case ETHERTYPE_PPPOES: 367 case ETHERTYPE_PPPOED2: 368 case ETHERTYPE_PPPOES2: 369 pppoe_print(/*ndo,*/p, length); 370 return (1); 371 372 case ETHERTYPE_EAPOL: 373 eap_print(ndo, p, length); 374 return (1); 375 376 case ETHERTYPE_RRCP: 377 rrcp_print(ndo, p - 14 , length + 14); 378 return (1); 379 380 case ETHERTYPE_PPP: 381 if (length) { 382 printf(": "); 383 ppp_print(/*ndo,*/p, length); 384 } 385 return (1); 386 387 case ETHERTYPE_MPCP: 388 mpcp_print(/*ndo,*/p, length); 389 return (1); 390 391 case ETHERTYPE_SLOW: 392 slow_print(/*ndo,*/p, length); 393 return (1); 394 395 case ETHERTYPE_CFM: 396 case ETHERTYPE_CFM_OLD: 397 cfm_print(/*ndo,*/p, length); 398 return (1); 399 400 case ETHERTYPE_LLDP: 401 lldp_print(/*ndo,*/p, length); 402 return (1); 403 404 case ETHERTYPE_LOOPBACK: 405 return (1); 406 407 case ETHERTYPE_MPLS: 408 case ETHERTYPE_MPLS_MULTI: 409 mpls_print(/*ndo,*/p, length); 410 return (1); 411 412 case ETHERTYPE_TIPC: 413 tipc_print(ndo, p, length, caplen); 414 return (1); 415 416 case ETHERTYPE_MS_NLB_HB: 417 msnlb_print(ndo, p, length); 418 return (1); 419 420 case ETHERTYPE_LAT: 421 case ETHERTYPE_SCA: 422 case ETHERTYPE_MOPRC: 423 case ETHERTYPE_MOPDL: 424 /* default_print for now */ 425 default: 426 return (0); 427 } 428} 429 430 431/* 432 * Local Variables: 433 * c-style: whitesmith 434 * c-basic-offset: 8 435 * End: 436 */ 437 438