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 22 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-ether.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include "interface.h" 35 #include "extract.h" 36 #include "addrtoname.h" 37 #include "ethertype.h" 38 #include "ether.h" 39 40 const struct tok ethertype_values[] = { 41 { ETHERTYPE_IP, "IPv4" }, 42 { ETHERTYPE_MPLS, "MPLS unicast" }, 43 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 44 { ETHERTYPE_IPV6, "IPv6" }, 45 { ETHERTYPE_8021Q, "802.1Q" }, 46 { ETHERTYPE_8021Q9100, "802.1Q-9100" }, 47 { ETHERTYPE_8021QinQ, "802.1Q-QinQ" }, 48 { ETHERTYPE_8021Q9200, "802.1Q-9200" }, 49 { ETHERTYPE_VMAN, "VMAN" }, 50 { ETHERTYPE_PUP, "PUP" }, 51 { ETHERTYPE_ARP, "ARP"}, 52 { ETHERTYPE_REVARP, "Reverse ARP"}, 53 { ETHERTYPE_NS, "NS" }, 54 { ETHERTYPE_SPRITE, "Sprite" }, 55 { ETHERTYPE_TRAIL, "Trail" }, 56 { ETHERTYPE_MOPDL, "MOP DL" }, 57 { ETHERTYPE_MOPRC, "MOP RC" }, 58 { ETHERTYPE_DN, "DN" }, 59 { ETHERTYPE_LAT, "LAT" }, 60 { ETHERTYPE_SCA, "SCA" }, 61 { ETHERTYPE_TEB, "TEB" }, 62 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 63 { ETHERTYPE_DECDNS, "DEC DNS" }, 64 { ETHERTYPE_DECDTS, "DEC DTS" }, 65 { ETHERTYPE_VEXP, "VEXP" }, 66 { ETHERTYPE_VPROD, "VPROD" }, 67 { ETHERTYPE_ATALK, "Appletalk" }, 68 { ETHERTYPE_AARP, "Appletalk ARP" }, 69 { ETHERTYPE_IPX, "IPX" }, 70 { ETHERTYPE_PPP, "PPP" }, 71 { ETHERTYPE_MPCP, "MPCP" }, 72 { ETHERTYPE_SLOW, "Slow Protocols" }, 73 { ETHERTYPE_PPPOED, "PPPoE D" }, 74 { ETHERTYPE_PPPOES, "PPPoE S" }, 75 { ETHERTYPE_EAPOL, "EAPOL" }, 76 { ETHERTYPE_RRCP, "RRCP" }, 77 { ETHERTYPE_MS_NLB_HB, "MS NLB heartbeat" }, 78 { ETHERTYPE_JUMBO, "Jumbo" }, 79 { ETHERTYPE_LOOPBACK, "Loopback" }, 80 { ETHERTYPE_ISO, "OSI" }, 81 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 82 { ETHERTYPE_CFM_OLD, "CFM (old)" }, 83 { ETHERTYPE_CFM, "CFM" }, 84 { ETHERTYPE_IEEE1905_1, "IEEE1905.1" }, 85 { ETHERTYPE_LLDP, "LLDP" }, 86 { ETHERTYPE_TIPC, "TIPC"}, 87 { ETHERTYPE_GEONET_OLD, "GeoNet (old)"}, 88 { ETHERTYPE_GEONET, "GeoNet"}, 89 { ETHERTYPE_CALM_FAST, "CALM FAST"}, 90 { ETHERTYPE_AOE, "AoE" }, 91 { 0, NULL} 92 }; 93 94 static inline void 95 ether_hdr_print(netdissect_options *ndo, 96 const u_char *bp, u_int length) 97 { 98 register const struct ether_header *ep; 99 uint16_t ether_type; 100 101 ep = (const struct ether_header *)bp; 102 103 ND_PRINT((ndo, "%s > %s", 104 etheraddr_string(ndo, ESRC(ep)), 105 etheraddr_string(ndo, EDST(ep)))); 106 107 ether_type = EXTRACT_16BITS(&ep->ether_type); 108 if (!ndo->ndo_qflag) { 109 if (ether_type <= ETHERMTU) 110 ND_PRINT((ndo, ", 802.3")); 111 else 112 ND_PRINT((ndo, ", ethertype %s (0x%04x)", 113 tok2str(ethertype_values,"Unknown", ether_type), 114 ether_type)); 115 } else { 116 if (ether_type <= ETHERMTU) 117 ND_PRINT((ndo, ", 802.3")); 118 else 119 ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type))); 120 } 121 122 ND_PRINT((ndo, ", length %u: ", length)); 123 } 124 125 /* 126 * Print an Ethernet frame. 127 * This might be encapsulated within another frame; we might be passed 128 * a pointer to a function that can print header information for that 129 * frame's protocol, and an argument to pass to that function. 130 */ 131 void 132 ether_print(netdissect_options *ndo, 133 const u_char *p, u_int length, u_int caplen, 134 void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg) 135 { 136 struct ether_header *ep; 137 u_int orig_length; 138 u_short ether_type; 139 u_short extracted_ether_type; 140 141 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 142 ND_PRINT((ndo, "[|ether]")); 143 return; 144 } 145 146 if (ndo->ndo_eflag) { 147 if (print_encap_header != NULL) 148 (*print_encap_header)(ndo, encap_header_arg); 149 ether_hdr_print(ndo, p, length); 150 } 151 orig_length = length; 152 153 length -= ETHER_HDRLEN; 154 caplen -= ETHER_HDRLEN; 155 ep = (struct ether_header *)p; 156 p += ETHER_HDRLEN; 157 158 ether_type = EXTRACT_16BITS(&ep->ether_type); 159 160 recurse: 161 /* 162 * Is it (gag) an 802.3 encapsulation? 163 */ 164 if (ether_type <= ETHERMTU) { 165 /* Try to print the LLC-layer header & higher layers */ 166 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep), 167 &extracted_ether_type) == 0) { 168 /* ether_type not known, print raw packet */ 169 if (!ndo->ndo_eflag) { 170 if (print_encap_header != NULL) 171 (*print_encap_header)(ndo, encap_header_arg); 172 ether_hdr_print(ndo, (u_char *)ep, orig_length); 173 } 174 175 if (!ndo->ndo_suppress_default_print) 176 ND_DEFAULTPRINT(p, caplen); 177 } 178 } else if (ether_type == ETHERTYPE_8021Q || 179 ether_type == ETHERTYPE_8021Q9100 || 180 ether_type == ETHERTYPE_8021Q9200 || 181 ether_type == ETHERTYPE_8021QinQ) { 182 /* 183 * Print VLAN information, and then go back and process 184 * the enclosed type field. 185 */ 186 if (caplen < 4 || length < 4) { 187 ND_PRINT((ndo, "[|vlan]")); 188 return; 189 } 190 if (ndo->ndo_eflag) { 191 uint16_t tag = EXTRACT_16BITS(p); 192 193 ND_PRINT((ndo, "vlan %u, p %u%s, ", 194 tag & 0xfff, 195 tag >> 13, 196 (tag & 0x1000) ? ", CFI" : "")); 197 } 198 199 ether_type = EXTRACT_16BITS(p + 2); 200 if (ndo->ndo_eflag && ether_type > ETHERMTU) 201 ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type))); 202 p += 4; 203 length -= 4; 204 caplen -= 4; 205 goto recurse; 206 } else if (ether_type == ETHERTYPE_JUMBO) { 207 /* 208 * Alteon jumbo frames. 209 * See 210 * 211 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 212 * 213 * which indicates that, following the type field, 214 * there's an LLC header and payload. 215 */ 216 /* Try to print the LLC-layer header & higher layers */ 217 if (llc_print(ndo, p, length, caplen, ESRC(ep), EDST(ep), 218 &extracted_ether_type) == 0) { 219 /* ether_type not known, print raw packet */ 220 if (!ndo->ndo_eflag) { 221 if (print_encap_header != NULL) 222 (*print_encap_header)(ndo, encap_header_arg); 223 ether_hdr_print(ndo, (u_char *)ep, orig_length); 224 } 225 226 if (!ndo->ndo_suppress_default_print) 227 ND_DEFAULTPRINT(p, caplen); 228 } 229 } else { 230 if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) { 231 /* ether_type not known, print raw packet */ 232 if (!ndo->ndo_eflag) { 233 if (print_encap_header != NULL) 234 (*print_encap_header)(ndo, encap_header_arg); 235 ether_hdr_print(ndo, (u_char *)ep, orig_length); 236 } 237 238 if (!ndo->ndo_suppress_default_print) 239 ND_DEFAULTPRINT(p, caplen); 240 } 241 } 242 } 243 244 /* 245 * This is the top level routine of the printer. 'p' points 246 * to the ether header of the packet, 'h->ts' is the timestamp, 247 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 248 * is the number of bytes actually captured. 249 */ 250 u_int 251 ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 252 const u_char *p) 253 { 254 ether_print(ndo, p, h->len, h->caplen, NULL, NULL); 255 256 return (ETHER_HDRLEN); 257 } 258 259 /* 260 * This is the top level routine of the printer. 'p' points 261 * to the ether header of the packet, 'h->ts' is the timestamp, 262 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 263 * is the number of bytes actually captured. 264 * 265 * This is for DLT_NETANALYZER, which has a 4-byte pseudo-header 266 * before the Ethernet header. 267 */ 268 u_int 269 netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, 270 const u_char *p) 271 { 272 /* 273 * Fail if we don't have enough data for the Hilscher pseudo-header. 274 */ 275 if (h->len < 4 || h->caplen < 4) { 276 ND_PRINT((ndo, "[|netanalyzer]")); 277 return (h->caplen); 278 } 279 280 /* Skip the pseudo-header. */ 281 ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL); 282 283 return (4 + ETHER_HDRLEN); 284 } 285 286 /* 287 * This is the top level routine of the printer. 'p' points 288 * to the ether header of the packet, 'h->ts' is the timestamp, 289 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 290 * is the number of bytes actually captured. 291 * 292 * This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte 293 * pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF 294 * before the Ethernet header. 295 */ 296 u_int 297 netanalyzer_transparent_if_print(netdissect_options *ndo, 298 const struct pcap_pkthdr *h, 299 const u_char *p) 300 { 301 /* 302 * Fail if we don't have enough data for the Hilscher pseudo-header, 303 * preamble, and SOF. 304 */ 305 if (h->len < 12 || h->caplen < 12) { 306 ND_PRINT((ndo, "[|netanalyzer-transparent]")); 307 return (h->caplen); 308 } 309 310 /* Skip the pseudo-header, preamble, and SOF. */ 311 ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL); 312 313 return (12 + ETHER_HDRLEN); 314 } 315 316 /* 317 * Prints the packet payload, given an Ethernet type code for the payload's 318 * protocol. 319 * 320 * Returns non-zero if it can do so, zero if the ethertype is unknown. 321 */ 322 323 int 324 ethertype_print(netdissect_options *ndo, 325 u_short ether_type, const u_char *p, 326 u_int length, u_int caplen) 327 { 328 switch (ether_type) { 329 330 case ETHERTYPE_IP: 331 ip_print(ndo, p, length); 332 return (1); 333 334 #ifdef INET6 335 case ETHERTYPE_IPV6: 336 ip6_print(ndo, p, length); 337 return (1); 338 #endif /*INET6*/ 339 340 case ETHERTYPE_ARP: 341 case ETHERTYPE_REVARP: 342 arp_print(ndo, p, length, caplen); 343 return (1); 344 345 case ETHERTYPE_DN: 346 decnet_print(ndo, p, length, caplen); 347 return (1); 348 349 case ETHERTYPE_ATALK: 350 if (ndo->ndo_vflag) 351 ND_PRINT((ndo, "et1 ")); 352 atalk_print(ndo, p, length); 353 return (1); 354 355 case ETHERTYPE_AARP: 356 aarp_print(ndo, p, length); 357 return (1); 358 359 case ETHERTYPE_IPX: 360 ND_PRINT((ndo, "(NOV-ETHII) ")); 361 ipx_print(ndo, p, length); 362 return (1); 363 364 case ETHERTYPE_ISO: 365 isoclns_print(ndo, p + 1, length - 1, length - 1); 366 return(1); 367 368 case ETHERTYPE_PPPOED: 369 case ETHERTYPE_PPPOES: 370 case ETHERTYPE_PPPOED2: 371 case ETHERTYPE_PPPOES2: 372 pppoe_print(ndo, p, length); 373 return (1); 374 375 case ETHERTYPE_EAPOL: 376 eap_print(ndo, p, length); 377 return (1); 378 379 case ETHERTYPE_RRCP: 380 rrcp_print(ndo, p - 14 , length + 14); 381 return (1); 382 383 case ETHERTYPE_PPP: 384 if (length) { 385 ND_PRINT((ndo, ": ")); 386 ppp_print(ndo, p, length); 387 } 388 return (1); 389 390 case ETHERTYPE_MPCP: 391 mpcp_print(ndo, p, length); 392 return (1); 393 394 case ETHERTYPE_SLOW: 395 slow_print(ndo, p, length); 396 return (1); 397 398 case ETHERTYPE_CFM: 399 case ETHERTYPE_CFM_OLD: 400 cfm_print(ndo, p, length); 401 return (1); 402 403 case ETHERTYPE_LLDP: 404 lldp_print(ndo, p, length); 405 return (1); 406 407 case ETHERTYPE_LOOPBACK: 408 loopback_print(ndo, p, length); 409 return (1); 410 411 case ETHERTYPE_MPLS: 412 case ETHERTYPE_MPLS_MULTI: 413 mpls_print(ndo, p, length); 414 return (1); 415 416 case ETHERTYPE_TIPC: 417 tipc_print(ndo, p, length, caplen); 418 return (1); 419 420 case ETHERTYPE_MS_NLB_HB: 421 msnlb_print(ndo, p); 422 return (1); 423 424 case ETHERTYPE_GEONET_OLD: 425 case ETHERTYPE_GEONET: 426 geonet_print(ndo, p-14, p, length); 427 return (1); 428 429 case ETHERTYPE_CALM_FAST: 430 calm_fast_print(ndo, p-14, p, length); 431 return (1); 432 433 case ETHERTYPE_AOE: 434 aoe_print(ndo, p, length); 435 return (1); 436 437 case ETHERTYPE_LAT: 438 case ETHERTYPE_SCA: 439 case ETHERTYPE_MOPRC: 440 case ETHERTYPE_MOPDL: 441 case ETHERTYPE_IEEE1905_1: 442 /* default_print for now */ 443 default: 444 return (0); 445 } 446 } 447 448 449 /* 450 * Local Variables: 451 * c-style: whitesmith 452 * c-basic-offset: 8 453 * End: 454 */ 455 456