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