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 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 #include <pcap.h> 36 37 #include "interface.h" 38 #include "extract.h" 39 #include "addrtoname.h" 40 #include "ethertype.h" 41 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_VMAN, "VMAN" }, 51 { ETHERTYPE_PUP, "PUP" }, 52 { ETHERTYPE_ARP, "ARP"}, 53 { ETHERTYPE_REVARP, "Reverse ARP"}, 54 { ETHERTYPE_NS, "NS" }, 55 { ETHERTYPE_SPRITE, "Sprite" }, 56 { ETHERTYPE_TRAIL, "Trail" }, 57 { ETHERTYPE_MOPDL, "MOP DL" }, 58 { ETHERTYPE_MOPRC, "MOP RC" }, 59 { ETHERTYPE_DN, "DN" }, 60 { ETHERTYPE_LAT, "LAT" }, 61 { ETHERTYPE_SCA, "SCA" }, 62 { ETHERTYPE_TEB, "TEB" }, 63 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 64 { ETHERTYPE_DECDNS, "DEC DNS" }, 65 { ETHERTYPE_DECDTS, "DEC DTS" }, 66 { ETHERTYPE_VEXP, "VEXP" }, 67 { ETHERTYPE_VPROD, "VPROD" }, 68 { ETHERTYPE_ATALK, "Appletalk" }, 69 { ETHERTYPE_AARP, "Appletalk ARP" }, 70 { ETHERTYPE_IPX, "IPX" }, 71 { ETHERTYPE_PPP, "PPP" }, 72 { ETHERTYPE_MPCP, "MPCP" }, 73 { ETHERTYPE_SLOW, "Slow Protocols" }, 74 { ETHERTYPE_PPPOED, "PPPoE D" }, 75 { ETHERTYPE_PPPOES, "PPPoE S" }, 76 { ETHERTYPE_EAPOL, "EAPOL" }, 77 { ETHERTYPE_RRCP, "RRCP" }, 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_LLDP, "LLDP" }, 85 { 0, NULL} 86 }; 87 88 static inline void 89 ether_hdr_print(register const u_char *bp, u_int length) 90 { 91 register const struct ether_header *ep; 92 u_int16_t ether_type; 93 94 ep = (const struct ether_header *)bp; 95 96 (void)printf("%s > %s", 97 etheraddr_string(ESRC(ep)), 98 etheraddr_string(EDST(ep))); 99 100 ether_type = EXTRACT_16BITS(&ep->ether_type); 101 if (!qflag) { 102 if (ether_type <= ETHERMTU) 103 (void)printf(", 802.3"); 104 else 105 (void)printf(", ethertype %s (0x%04x)", 106 tok2str(ethertype_values,"Unknown", ether_type), 107 ether_type); 108 } else { 109 if (ether_type <= ETHERMTU) 110 (void)printf(", 802.3"); 111 else 112 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)); 113 } 114 115 (void)printf(", length %u: ", length); 116 } 117 118 /* 119 * Print an Ethernet frame. 120 * This might be encapsulated within another frame; we might be passed 121 * a pointer to a function that can print header information for that 122 * frame's protocol, and an argument to pass to that function. 123 */ 124 void 125 ether_print(const u_char *p, u_int length, u_int caplen, 126 void (*print_encap_header)(const u_char *), const u_char *encap_header_arg) 127 { 128 struct ether_header *ep; 129 u_int orig_length; 130 u_short ether_type; 131 u_short extracted_ether_type; 132 133 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 134 printf("[|ether]"); 135 return; 136 } 137 138 if (eflag) { 139 if (print_encap_header != NULL) 140 (*print_encap_header)(encap_header_arg); 141 ether_hdr_print(p, length); 142 } 143 orig_length = length; 144 145 length -= ETHER_HDRLEN; 146 caplen -= ETHER_HDRLEN; 147 ep = (struct ether_header *)p; 148 p += ETHER_HDRLEN; 149 150 ether_type = EXTRACT_16BITS(&ep->ether_type); 151 152 recurse: 153 /* 154 * Is it (gag) an 802.3 encapsulation? 155 */ 156 if (ether_type <= ETHERMTU) { 157 /* Try to print the LLC-layer header & higher layers */ 158 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 159 &extracted_ether_type) == 0) { 160 /* ether_type not known, print raw packet */ 161 if (!eflag) { 162 if (print_encap_header != NULL) 163 (*print_encap_header)(encap_header_arg); 164 ether_hdr_print((u_char *)ep, orig_length); 165 } 166 167 if (!suppress_default_print) 168 default_print(p, caplen); 169 } 170 } else if (ether_type == ETHERTYPE_8021Q) { 171 /* 172 * Print VLAN information, and then go back and process 173 * the enclosed type field. 174 */ 175 if (caplen < 4 || length < 4) { 176 printf("[|vlan]"); 177 return; 178 } 179 if (eflag) { 180 u_int16_t tag = EXTRACT_16BITS(p); 181 182 printf("vlan %u, p %u%s, ", 183 tag & 0xfff, 184 tag >> 13, 185 (tag & 0x1000) ? ", CFI" : ""); 186 } 187 188 ether_type = EXTRACT_16BITS(p + 2); 189 if (eflag && ether_type > ETHERMTU) 190 printf("ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)); 191 p += 4; 192 length -= 4; 193 caplen -= 4; 194 goto recurse; 195 } else if (ether_type == ETHERTYPE_JUMBO) { 196 /* 197 * Alteon jumbo frames. 198 * See 199 * 200 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 201 * 202 * which indicates that, following the type field, 203 * there's an LLC header and payload. 204 */ 205 /* Try to print the LLC-layer header & higher layers */ 206 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 207 &extracted_ether_type) == 0) { 208 /* ether_type not known, print raw packet */ 209 if (!eflag) { 210 if (print_encap_header != NULL) 211 (*print_encap_header)(encap_header_arg); 212 ether_hdr_print((u_char *)ep, orig_length); 213 } 214 215 if (!suppress_default_print) 216 default_print(p, caplen); 217 } 218 } else { 219 if (ethertype_print(ether_type, p, length, caplen) == 0) { 220 /* ether_type not known, print raw packet */ 221 if (!eflag) { 222 if (print_encap_header != NULL) 223 (*print_encap_header)(encap_header_arg); 224 ether_hdr_print((u_char *)ep, orig_length); 225 } 226 227 if (!suppress_default_print) 228 default_print(p, caplen); 229 } 230 } 231 } 232 233 /* 234 * This is the top level routine of the printer. 'p' points 235 * to the ether header of the packet, 'h->ts' is the timestamp, 236 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 237 * is the number of bytes actually captured. 238 */ 239 u_int 240 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 241 { 242 ether_print(p, h->len, h->caplen, NULL, NULL); 243 244 return (ETHER_HDRLEN); 245 } 246 247 /* 248 * Prints the packet payload, given an Ethernet type code for the payload's 249 * protocol. 250 * 251 * Returns non-zero if it can do so, zero if the ethertype is unknown. 252 */ 253 254 int 255 ethertype_print(u_short ether_type, const u_char *p, u_int length, u_int caplen) 256 { 257 switch (ether_type) { 258 259 case ETHERTYPE_IP: 260 ip_print(gndo, p, length); 261 return (1); 262 263 #ifdef INET6 264 case ETHERTYPE_IPV6: 265 ip6_print(p, length); 266 return (1); 267 #endif /*INET6*/ 268 269 case ETHERTYPE_ARP: 270 case ETHERTYPE_REVARP: 271 arp_print(gndo, p, length, caplen); 272 return (1); 273 274 case ETHERTYPE_DN: 275 decnet_print(p, length, caplen); 276 return (1); 277 278 case ETHERTYPE_ATALK: 279 if (vflag) 280 fputs("et1 ", stdout); 281 atalk_print(p, length); 282 return (1); 283 284 case ETHERTYPE_AARP: 285 aarp_print(p, length); 286 return (1); 287 288 case ETHERTYPE_IPX: 289 printf("(NOV-ETHII) "); 290 ipx_print(p, length); 291 return (1); 292 293 case ETHERTYPE_ISO: 294 isoclns_print(p+1, length-1, length-1); 295 return(1); 296 297 case ETHERTYPE_PPPOED: 298 case ETHERTYPE_PPPOES: 299 case ETHERTYPE_PPPOED2: 300 case ETHERTYPE_PPPOES2: 301 pppoe_print(p, length); 302 return (1); 303 304 case ETHERTYPE_EAPOL: 305 eap_print(gndo, p, length); 306 return (1); 307 308 case ETHERTYPE_RRCP: 309 rrcp_print(gndo, p - 14 , length + 14); 310 return (1); 311 312 case ETHERTYPE_PPP: 313 if (length) { 314 printf(": "); 315 ppp_print(p, length); 316 } 317 return (1); 318 319 case ETHERTYPE_MPCP: 320 mpcp_print(p, length); 321 return (1); 322 323 case ETHERTYPE_SLOW: 324 slow_print(p, length); 325 return (1); 326 327 case ETHERTYPE_CFM: 328 case ETHERTYPE_CFM_OLD: 329 cfm_print(p, length); 330 return (1); 331 332 case ETHERTYPE_LLDP: 333 lldp_print(p, length); 334 return (1); 335 336 case ETHERTYPE_LOOPBACK: 337 return (1); 338 339 case ETHERTYPE_MPLS: 340 case ETHERTYPE_MPLS_MULTI: 341 mpls_print(p, length); 342 return (1); 343 344 case ETHERTYPE_LAT: 345 case ETHERTYPE_SCA: 346 case ETHERTYPE_MOPRC: 347 case ETHERTYPE_MOPDL: 348 /* default_print for now */ 349 default: 350 return (0); 351 } 352 } 353 354 355 /* 356 * Local Variables: 357 * c-style: whitesmith 358 * c-basic-offset: 8 359 * End: 360 */ 361 362