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 1.2 2010/12/05 05:11:30 christos Exp $"); 28 #endif 29 #endif 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <tcpdump-stdinc.h> 36 37 #include <stdio.h> 38 #include <pcap.h> 39 40 #include "interface.h" 41 #include "extract.h" 42 #include "addrtoname.h" 43 #include "ethertype.h" 44 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_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 { 0, NULL} 89 }; 90 91 static inline void 92 ether_hdr_print(register 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)printf("%s > %s", 100 etheraddr_string(ESRC(ep)), 101 etheraddr_string(EDST(ep))); 102 103 ether_type = EXTRACT_16BITS(&ep->ether_type); 104 if (!qflag) { 105 if (ether_type <= ETHERMTU) 106 (void)printf(", 802.3"); 107 else 108 (void)printf(", ethertype %s (0x%04x)", 109 tok2str(ethertype_values,"Unknown", ether_type), 110 ether_type); 111 } else { 112 if (ether_type <= ETHERMTU) 113 (void)printf(", 802.3"); 114 else 115 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)); 116 } 117 118 (void)printf(", 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(const u_char *p, u_int length, u_int caplen, 129 void (*print_encap_header)(const u_char *), const u_char *encap_header_arg) 130 { 131 struct ether_header *ep; 132 u_int orig_length; 133 u_short ether_type; 134 u_short extracted_ether_type; 135 136 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 137 printf("[|ether]"); 138 return; 139 } 140 141 if (eflag) { 142 if (print_encap_header != NULL) 143 (*print_encap_header)(encap_header_arg); 144 ether_hdr_print(p, length); 145 } 146 orig_length = length; 147 148 length -= ETHER_HDRLEN; 149 caplen -= ETHER_HDRLEN; 150 ep = (struct ether_header *)p; 151 p += ETHER_HDRLEN; 152 153 ether_type = EXTRACT_16BITS(&ep->ether_type); 154 155 recurse: 156 /* 157 * Is it (gag) an 802.3 encapsulation? 158 */ 159 if (ether_type <= ETHERMTU) { 160 /* Try to print the LLC-layer header & higher layers */ 161 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 162 &extracted_ether_type) == 0) { 163 /* ether_type not known, print raw packet */ 164 if (!eflag) { 165 if (print_encap_header != NULL) 166 (*print_encap_header)(encap_header_arg); 167 ether_hdr_print((u_char *)ep, orig_length); 168 } 169 170 if (!suppress_default_print) 171 default_print(p, caplen); 172 } 173 } else if (ether_type == ETHERTYPE_8021Q) { 174 /* 175 * Print VLAN information, and then go back and process 176 * the enclosed type field. 177 */ 178 if (caplen < 4 || length < 4) { 179 printf("[|vlan]"); 180 return; 181 } 182 if (eflag) { 183 u_int16_t tag = EXTRACT_16BITS(p); 184 185 printf("vlan %u, p %u%s, ", 186 tag & 0xfff, 187 tag >> 13, 188 (tag & 0x1000) ? ", CFI" : ""); 189 } 190 191 ether_type = EXTRACT_16BITS(p + 2); 192 if (eflag && ether_type > ETHERMTU) 193 printf("ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)); 194 p += 4; 195 length -= 4; 196 caplen -= 4; 197 goto recurse; 198 } else if (ether_type == ETHERTYPE_JUMBO) { 199 /* 200 * Alteon jumbo frames. 201 * See 202 * 203 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 204 * 205 * which indicates that, following the type field, 206 * there's an LLC header and payload. 207 */ 208 /* Try to print the LLC-layer header & higher layers */ 209 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 210 &extracted_ether_type) == 0) { 211 /* ether_type not known, print raw packet */ 212 if (!eflag) { 213 if (print_encap_header != NULL) 214 (*print_encap_header)(encap_header_arg); 215 ether_hdr_print((u_char *)ep, orig_length); 216 } 217 218 if (!suppress_default_print) 219 default_print(p, caplen); 220 } 221 } else { 222 if (ethertype_print(ether_type, p, length, caplen) == 0) { 223 /* ether_type not known, print raw packet */ 224 if (!eflag) { 225 if (print_encap_header != NULL) 226 (*print_encap_header)(encap_header_arg); 227 ether_hdr_print((u_char *)ep, orig_length); 228 } 229 230 if (!suppress_default_print) 231 default_print(p, caplen); 232 } 233 } 234 } 235 236 /* 237 * This is the top level routine of the printer. 'p' points 238 * to the ether header of the packet, 'h->ts' is the timestamp, 239 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 240 * is the number of bytes actually captured. 241 */ 242 u_int 243 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 244 { 245 ether_print(p, h->len, h->caplen, NULL, NULL); 246 247 return (ETHER_HDRLEN); 248 } 249 250 /* 251 * Prints the packet payload, given an Ethernet type code for the payload's 252 * protocol. 253 * 254 * Returns non-zero if it can do so, zero if the ethertype is unknown. 255 */ 256 257 int 258 ethertype_print(u_short ether_type, const u_char *p, u_int length, u_int caplen) 259 { 260 switch (ether_type) { 261 262 case ETHERTYPE_IP: 263 ip_print(gndo, p, length); 264 return (1); 265 266 #ifdef INET6 267 case ETHERTYPE_IPV6: 268 ip6_print(p, length); 269 return (1); 270 #endif /*INET6*/ 271 272 case ETHERTYPE_ARP: 273 case ETHERTYPE_REVARP: 274 arp_print(gndo, p, length, caplen); 275 return (1); 276 277 case ETHERTYPE_DN: 278 decnet_print(p, length, caplen); 279 return (1); 280 281 case ETHERTYPE_ATALK: 282 if (vflag) 283 fputs("et1 ", stdout); 284 atalk_print(p, length); 285 return (1); 286 287 case ETHERTYPE_AARP: 288 aarp_print(p, length); 289 return (1); 290 291 case ETHERTYPE_IPX: 292 printf("(NOV-ETHII) "); 293 ipx_print(p, length); 294 return (1); 295 296 case ETHERTYPE_ISO: 297 isoclns_print(p+1, length-1, length-1); 298 return(1); 299 300 case ETHERTYPE_PPPOED: 301 case ETHERTYPE_PPPOES: 302 case ETHERTYPE_PPPOED2: 303 case ETHERTYPE_PPPOES2: 304 pppoe_print(p, length); 305 return (1); 306 307 case ETHERTYPE_EAPOL: 308 eap_print(gndo, p, length); 309 return (1); 310 311 case ETHERTYPE_RRCP: 312 rrcp_print(gndo, p - 14 , length + 14); 313 return (1); 314 315 case ETHERTYPE_PPP: 316 if (length) { 317 printf(": "); 318 ppp_print(p, length); 319 } 320 return (1); 321 322 case ETHERTYPE_MPCP: 323 mpcp_print(p, length); 324 return (1); 325 326 case ETHERTYPE_SLOW: 327 slow_print(p, length); 328 return (1); 329 330 case ETHERTYPE_CFM: 331 case ETHERTYPE_CFM_OLD: 332 cfm_print(p, length); 333 return (1); 334 335 case ETHERTYPE_LLDP: 336 lldp_print(p, length); 337 return (1); 338 339 case ETHERTYPE_LOOPBACK: 340 return (1); 341 342 case ETHERTYPE_MPLS: 343 case ETHERTYPE_MPLS_MULTI: 344 mpls_print(p, length); 345 return (1); 346 347 case ETHERTYPE_LAT: 348 case ETHERTYPE_SCA: 349 case ETHERTYPE_MOPRC: 350 case ETHERTYPE_MOPDL: 351 /* default_print for now */ 352 default: 353 return (0); 354 } 355 } 356 357 358 /* 359 * Local Variables: 360 * c-style: whitesmith 361 * c-basic-offset: 8 362 * End: 363 */ 364 365