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