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