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 #include <sys/cdefs.h> 22 #ifndef lint 23 #if 0 24 static const char rcsid[] _U_ = 25 "@(#) Header: /tcpdump/master/tcpdump/print-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp (LBL)"; 26 #else 27 __RCSID("$NetBSD: print-ether.c,v 1.4 2013/12/31 17:33:31 christos Exp $"); 28 #endif 29 #endif 30 31 #define NETDISSECT_REWORKED 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <tcpdump-stdinc.h> 37 38 #include <stdio.h> 39 #include <pcap.h> 40 41 #include "interface.h" 42 #include "extract.h" 43 #include "addrtoname.h" 44 #include "ethertype.h" 45 #include "ether.h" 46 47 const struct tok ethertype_values[] = { 48 { ETHERTYPE_IP, "IPv4" }, 49 { ETHERTYPE_MPLS, "MPLS unicast" }, 50 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 51 { ETHERTYPE_IPV6, "IPv6" }, 52 { ETHERTYPE_8021Q, "802.1Q" }, 53 { ETHERTYPE_8021Q9100, "802.1Q-9100" }, 54 { ETHERTYPE_8021QinQ, "802.1Q-QinQ" }, 55 { ETHERTYPE_8021Q9200, "802.1Q-9200" }, 56 { ETHERTYPE_VMAN, "VMAN" }, 57 { ETHERTYPE_PUP, "PUP" }, 58 { ETHERTYPE_ARP, "ARP"}, 59 { ETHERTYPE_REVARP, "Reverse ARP"}, 60 { ETHERTYPE_NS, "NS" }, 61 { ETHERTYPE_SPRITE, "Sprite" }, 62 { ETHERTYPE_TRAIL, "Trail" }, 63 { ETHERTYPE_MOPDL, "MOP DL" }, 64 { ETHERTYPE_MOPRC, "MOP RC" }, 65 { ETHERTYPE_DN, "DN" }, 66 { ETHERTYPE_LAT, "LAT" }, 67 { ETHERTYPE_SCA, "SCA" }, 68 { ETHERTYPE_TEB, "TEB" }, 69 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 70 { ETHERTYPE_DECDNS, "DEC DNS" }, 71 { ETHERTYPE_DECDTS, "DEC DTS" }, 72 { ETHERTYPE_VEXP, "VEXP" }, 73 { ETHERTYPE_VPROD, "VPROD" }, 74 { ETHERTYPE_ATALK, "Appletalk" }, 75 { ETHERTYPE_AARP, "Appletalk ARP" }, 76 { ETHERTYPE_IPX, "IPX" }, 77 { ETHERTYPE_PPP, "PPP" }, 78 { ETHERTYPE_MPCP, "MPCP" }, 79 { ETHERTYPE_SLOW, "Slow Protocols" }, 80 { ETHERTYPE_PPPOED, "PPPoE D" }, 81 { ETHERTYPE_PPPOES, "PPPoE S" }, 82 { ETHERTYPE_EAPOL, "EAPOL" }, 83 { ETHERTYPE_RRCP, "RRCP" }, 84 { ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" }, 85 { ETHERTYPE_JUMBO, "Jumbo" }, 86 { ETHERTYPE_LOOPBACK, "Loopback" }, 87 { ETHERTYPE_ISO, "OSI" }, 88 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 89 { ETHERTYPE_CFM_OLD, "CFM (old)" }, 90 { ETHERTYPE_CFM, "CFM" }, 91 { ETHERTYPE_LLDP, "LLDP" }, 92 { ETHERTYPE_TIPC, "TIPC"}, 93 { ETHERTYPE_GEONET_OLD, "GeoNet (old)"}, 94 { ETHERTYPE_GEONET, "GeoNet"}, 95 { ETHERTYPE_CALM_FAST, "CALM FAST"}, 96 { 0, NULL} 97 }; 98 99 static inline void 100 ether_hdr_print(netdissect_options *ndo, 101 const u_char *bp, u_int length) 102 { 103 register const struct ether_header *ep; 104 u_int16_t ether_type; 105 106 ep = (const struct ether_header *)bp; 107 108 (void)ND_PRINT((ndo, "%s > %s", 109 etheraddr_string(ESRC(ep)), 110 etheraddr_string(EDST(ep)))); 111 112 ether_type = EXTRACT_16BITS(&ep->ether_type); 113 if (!ndo->ndo_qflag) { 114 if (ether_type <= ETHERMTU) 115 (void)ND_PRINT((ndo, ", 802.3")); 116 else 117 (void)ND_PRINT((ndo, ", ethertype %s (0x%04x)", 118 tok2str(ethertype_values,"Unknown", ether_type), 119 ether_type)); 120 } else { 121 if (ether_type <= ETHERMTU) 122 (void)ND_PRINT((ndo, ", 802.3")); 123 else 124 (void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type))); 125 } 126 127 (void)ND_PRINT((ndo, ", length %u: ", length)); 128 } 129 130 /* 131 * Print an Ethernet frame. 132 * This might be encapsulated within another frame; we might be passed 133 * a pointer to a function that can print header information for that 134 * frame's protocol, and an argument to pass to that function. 135 */ 136 void 137 ether_print(netdissect_options *ndo, 138 const u_char *p, u_int length, u_int caplen, 139 void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg) 140 { 141 struct ether_header *ep; 142 u_int orig_length; 143 u_short ether_type; 144 u_short extracted_ether_type; 145 146 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 147 ND_PRINT((ndo, "[|ether]")); 148 return; 149 } 150 151 if (ndo->ndo_eflag) { 152 if (print_encap_header != NULL) 153 (*print_encap_header)(ndo, encap_header_arg); 154 ether_hdr_print(ndo, p, length); 155 } 156 orig_length = length; 157 158 length -= ETHER_HDRLEN; 159 caplen -= ETHER_HDRLEN; 160 ep = (struct ether_header *)p; 161 p += ETHER_HDRLEN; 162 163 ether_type = EXTRACT_16BITS(&ep->ether_type); 164 165 recurse: 166 /* 167 * Is it (gag) an 802.3 encapsulation? 168 */ 169 if (ether_type <= ETHERMTU) { 170 /* Try to print the LLC-layer header & higher layers */ 171 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 172 &extracted_ether_type) == 0) { 173 /* ether_type not known, print raw packet */ 174 if (!ndo->ndo_eflag) { 175 if (print_encap_header != NULL) 176 (*print_encap_header)(ndo, encap_header_arg); 177 ether_hdr_print(ndo, (u_char *)ep, orig_length); 178 } 179 180 if (!ndo->ndo_suppress_default_print) 181 ndo->ndo_default_print(ndo, p, caplen); 182 } 183 } else if (ether_type == ETHERTYPE_8021Q || 184 ether_type == ETHERTYPE_8021Q9100 || 185 ether_type == ETHERTYPE_8021Q9200 || 186 ether_type == ETHERTYPE_8021QinQ) { 187 /* 188 * Print VLAN information, and then go back and process 189 * the enclosed type field. 190 */ 191 if (caplen < 4 || length < 4) { 192 ND_PRINT((ndo, "[|vlan]")); 193 return; 194 } 195 if (ndo->ndo_eflag) { 196 u_int16_t tag = EXTRACT_16BITS(p); 197 198 ND_PRINT((ndo, "vlan %u, p %u%s, ", 199 tag & 0xfff, 200 tag >> 13, 201 (tag & 0x1000) ? ", CFI" : "")); 202 } 203 204 ether_type = EXTRACT_16BITS(p + 2); 205 if (ndo->ndo_eflag && ether_type > ETHERMTU) 206 ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type))); 207 p += 4; 208 length -= 4; 209 caplen -= 4; 210 goto recurse; 211 } else if (ether_type == ETHERTYPE_JUMBO) { 212 /* 213 * Alteon jumbo frames. 214 * See 215 * 216 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 217 * 218 * which indicates that, following the type field, 219 * there's an LLC header and payload. 220 */ 221 /* Try to print the LLC-layer header & higher layers */ 222 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 223 &extracted_ether_type) == 0) { 224 /* ether_type not known, print raw packet */ 225 if (!ndo->ndo_eflag) { 226 if (print_encap_header != NULL) 227 (*print_encap_header)(ndo, encap_header_arg); 228 ether_hdr_print(ndo, (u_char *)ep, orig_length); 229 } 230 231 if (!ndo->ndo_suppress_default_print) 232 ndo->ndo_default_print(ndo, p, caplen); 233 } 234 } else { 235 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) { 236 /* ether_type not known, print raw packet */ 237 if (!ndo->ndo_eflag) { 238 if (print_encap_header != NULL) 239 (*print_encap_header)(ndo, encap_header_arg); 240 ether_hdr_print(ndo, (u_char *)ep, orig_length); 241 } 242 243 if (!ndo->ndo_suppress_default_print) 244 ndo->ndo_default_print(ndo, p, caplen); 245 } 246 } 247 } 248 249 /* 250 * This is the top level routine of the printer. 'p' points 251 * to the ether header of the packet, 'h->ts' is the timestamp, 252 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 253 * is the number of bytes actually captured. 254 */ 255 u_int 256 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 257 const u_char *p) 258 { 259 ether_print(ndo, p, h->len, h->caplen, NULL, NULL); 260 261 return (ETHER_HDRLEN); 262 } 263 264 /* 265 * This is the top level routine of the printer. 'p' points 266 * to the ether header of the packet, 'h->ts' is the timestamp, 267 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 268 * is the number of bytes actually captured. 269 * 270 * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header 271 * before the Ethernet header. 272 */ 273 u_int 274 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 275 const u_char *p) 276 { 277 /* 278 * Fail if we don't have enough data for the Hilscher pseudo-header. 279 */ 280 if (h->len < 4 || h->caplen < 4) { 281 printf("[|netanalyzer]"); 282 return (h->caplen); 283 } 284 285 /* Skip the pseudo-header. */ 286 ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL); 287 288 return (4 + ETHER_HDRLEN); 289 } 290 291 /* 292 * This is the top level routine of the printer. 'p' points 293 * to the ether header of the packet, 'h->ts' is the timestamp, 294 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 295 * is the number of bytes actually captured. 296 * 297 * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte 298 * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF 299 * before the Ethernet header. 300 */ 301 u_int 302 netanalyzer_transparent_if_print(netdissect_options *ndo, 303 const struct pcap_pkthdr *h, 304 const u_char *p) 305 { 306 /* 307 * Fail if we don't have enough data for the Hilscher pseudo-header, 308 * preamble, and SOF. 309 */ 310 if (h->len < 12 || h->caplen < 12) { 311 printf("[|netanalyzer-transparent]"); 312 return (h->caplen); 313 } 314 315 /* Skip the pseudo-header, preamble, and SOF. */ 316 ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL); 317 318 return (12 + ETHER_HDRLEN); 319 } 320 321 /* 322 * Prints the packet payload, given an Ethernet type code for the payload's 323 * protocol. 324 * 325 * Returns non-zero if it can do so, zero if the ethertype is unknown. 326 */ 327 328 int 329 ethertype_print(netdissect_options *ndo, 330 u_short ether_type, const u_char *p, 331 u_int length, u_int caplen) 332 { 333 switch (ether_type) { 334 335 case ETHERTYPE_IP: 336 ip_print(ndo, p, length); 337 return (1); 338 339 #ifdef INET6 340 case ETHERTYPE_IPV6: 341 ip6_print(ndo, p, length); 342 return (1); 343 #endif /*INET6*/ 344 345 case ETHERTYPE_ARP: 346 case ETHERTYPE_REVARP: 347 arp_print(ndo, p, length, caplen); 348 return (1); 349 350 case ETHERTYPE_DN: 351 decnet_print(/*ndo,*/p, length, caplen); 352 return (1); 353 354 case ETHERTYPE_ATALK: 355 if (ndo->ndo_vflag) 356 fputs("et1 ", stdout); 357 atalk_print(/*ndo,*/p, length); 358 return (1); 359 360 case ETHERTYPE_AARP: 361 aarp_print(/*ndo,*/p, length); 362 return (1); 363 364 case ETHERTYPE_IPX: 365 ND_PRINT((ndo, "(NOV-ETHII) ")); 366 ipx_print(/*ndo,*/p, length); 367 return (1); 368 369 case ETHERTYPE_ISO: 370 isoclns_print(/*ndo,*/p+1, length-1, length-1); 371 return(1); 372 373 case ETHERTYPE_PPPOED: 374 case ETHERTYPE_PPPOES: 375 case ETHERTYPE_PPPOED2: 376 case ETHERTYPE_PPPOES2: 377 pppoe_print(/*ndo,*/p, length); 378 return (1); 379 380 case ETHERTYPE_EAPOL: 381 eap_print(ndo, p, length); 382 return (1); 383 384 case ETHERTYPE_RRCP: 385 rrcp_print(ndo, p - 14 , length + 14); 386 return (1); 387 388 case ETHERTYPE_PPP: 389 if (length) { 390 printf(": "); 391 ppp_print(/*ndo,*/p, length); 392 } 393 return (1); 394 395 case ETHERTYPE_MPCP: 396 mpcp_print(/*ndo,*/p, length); 397 return (1); 398 399 case ETHERTYPE_SLOW: 400 slow_print(/*ndo,*/p, length); 401 return (1); 402 403 case ETHERTYPE_CFM: 404 case ETHERTYPE_CFM_OLD: 405 cfm_print(/*ndo,*/p, length); 406 return (1); 407 408 case ETHERTYPE_LLDP: 409 lldp_print(/*ndo,*/p, length); 410 return (1); 411 412 case ETHERTYPE_LOOPBACK: 413 return (1); 414 415 case ETHERTYPE_MPLS: 416 case ETHERTYPE_MPLS_MULTI: 417 mpls_print(/*ndo,*/p, length); 418 return (1); 419 420 case ETHERTYPE_TIPC: 421 tipc_print(ndo, p, length, caplen); 422 return (1); 423 424 case ETHERTYPE_MS_NLB_HB: 425 msnlb_print(ndo, p); 426 return (1); 427 428 case ETHERTYPE_GEONET_OLD: 429 case ETHERTYPE_GEONET: 430 geonet_print(ndo, p-14, p, length); 431 return (1); 432 433 case ETHERTYPE_CALM_FAST: 434 calm_fast_print(ndo, p-14, p, length); 435 return (1); 436 437 case ETHERTYPE_LAT: 438 case ETHERTYPE_SCA: 439 case ETHERTYPE_MOPRC: 440 case ETHERTYPE_MOPDL: 441 /* default_print for now */ 442 default: 443 return (0); 444 } 445 } 446 447 448 /* 449 * Local Variables: 450 * c-style: whitesmith 451 * c-basic-offset: 8 452 * End: 453 */ 454 455