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 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <tcpdump-stdinc.h> 31 32 #include <stdio.h> 33 #include <pcap.h> 34 35 #include "interface.h" 36 #include "extract.h" 37 #include "addrtoname.h" 38 #include "ethertype.h" 39 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_VMAN, "VMAN" }, 49 { ETHERTYPE_PUP, "PUP" }, 50 { ETHERTYPE_ARP, "ARP"}, 51 { ETHERTYPE_REVARP, "Reverse ARP"}, 52 { ETHERTYPE_NS, "NS" }, 53 { ETHERTYPE_SPRITE, "Sprite" }, 54 { ETHERTYPE_TRAIL, "Trail" }, 55 { ETHERTYPE_MOPDL, "MOP DL" }, 56 { ETHERTYPE_MOPRC, "MOP RC" }, 57 { ETHERTYPE_DN, "DN" }, 58 { ETHERTYPE_LAT, "LAT" }, 59 { ETHERTYPE_SCA, "SCA" }, 60 { ETHERTYPE_TEB, "TEB" }, 61 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 62 { ETHERTYPE_DECDNS, "DEC DNS" }, 63 { ETHERTYPE_DECDTS, "DEC DTS" }, 64 { ETHERTYPE_VEXP, "VEXP" }, 65 { ETHERTYPE_VPROD, "VPROD" }, 66 { ETHERTYPE_ATALK, "Appletalk" }, 67 { ETHERTYPE_AARP, "Appletalk ARP" }, 68 { ETHERTYPE_IPX, "IPX" }, 69 { ETHERTYPE_PPP, "PPP" }, 70 { ETHERTYPE_MPCP, "MPCP" }, 71 { ETHERTYPE_SLOW, "Slow Protocols" }, 72 { ETHERTYPE_PPPOED, "PPPoE D" }, 73 { ETHERTYPE_PPPOES, "PPPoE S" }, 74 { ETHERTYPE_EAPOL, "EAPOL" }, 75 { ETHERTYPE_RRCP, "RRCP" }, 76 { ETHERTYPE_JUMBO, "Jumbo" }, 77 { ETHERTYPE_LOOPBACK, "Loopback" }, 78 { ETHERTYPE_ISO, "OSI" }, 79 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 80 { ETHERTYPE_CFM_OLD, "CFM (old)" }, 81 { ETHERTYPE_CFM, "CFM" }, 82 { ETHERTYPE_LLDP, "LLDP" }, 83 { 0, NULL} 84 }; 85 86 static inline void 87 ether_hdr_print(register const u_char *bp, u_int length) 88 { 89 register const struct ether_header *ep; 90 u_int16_t ether_type; 91 92 ep = (const struct ether_header *)bp; 93 94 (void)printf("%s > %s", 95 etheraddr_string(ESRC(ep)), 96 etheraddr_string(EDST(ep))); 97 98 ether_type = EXTRACT_16BITS(&ep->ether_type); 99 if (!qflag) { 100 if (ether_type <= ETHERMTU) 101 (void)printf(", 802.3"); 102 else 103 (void)printf(", ethertype %s (0x%04x)", 104 tok2str(ethertype_values,"Unknown", ether_type), 105 ether_type); 106 } else { 107 if (ether_type <= ETHERMTU) 108 (void)printf(", 802.3"); 109 else 110 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)); 111 } 112 113 (void)printf(", length %u: ", length); 114 } 115 116 /* 117 * Print an Ethernet frame. 118 * This might be encapsulated within another frame; we might be passed 119 * a pointer to a function that can print header information for that 120 * frame's protocol, and an argument to pass to that function. 121 */ 122 void 123 ether_print(const u_char *p, u_int length, u_int caplen, 124 void (*print_encap_header)(const u_char *), const u_char *encap_header_arg) 125 { 126 struct ether_header *ep; 127 u_int orig_length; 128 u_short ether_type; 129 u_short extracted_ether_type; 130 131 if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) { 132 printf("[|ether]"); 133 return; 134 } 135 136 if (eflag) { 137 if (print_encap_header != NULL) 138 (*print_encap_header)(encap_header_arg); 139 ether_hdr_print(p, length); 140 } 141 orig_length = length; 142 143 length -= ETHER_HDRLEN; 144 caplen -= ETHER_HDRLEN; 145 ep = (struct ether_header *)p; 146 p += ETHER_HDRLEN; 147 148 ether_type = EXTRACT_16BITS(&ep->ether_type); 149 150 recurse: 151 /* 152 * Is it (gag) an 802.3 encapsulation? 153 */ 154 if (ether_type <= ETHERMTU) { 155 /* Try to print the LLC-layer header & higher layers */ 156 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 157 &extracted_ether_type) == 0) { 158 /* ether_type not known, print raw packet */ 159 if (!eflag) { 160 if (print_encap_header != NULL) 161 (*print_encap_header)(encap_header_arg); 162 ether_hdr_print((u_char *)ep, orig_length); 163 } 164 165 if (!suppress_default_print) 166 default_print(p, caplen); 167 } 168 } else if (ether_type == ETHERTYPE_8021Q) { 169 /* 170 * Print VLAN information, and then go back and process 171 * the enclosed type field. 172 */ 173 if (caplen < 4 || length < 4) { 174 printf("[|vlan]"); 175 return; 176 } 177 if (eflag) { 178 u_int16_t tag = EXTRACT_16BITS(p); 179 180 printf("vlan %u, p %u%s, ", 181 tag & 0xfff, 182 tag >> 13, 183 (tag & 0x1000) ? ", CFI" : ""); 184 } 185 186 ether_type = EXTRACT_16BITS(p + 2); 187 if (eflag && ether_type > ETHERMTU) 188 printf("ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)); 189 p += 4; 190 length -= 4; 191 caplen -= 4; 192 goto recurse; 193 } else if (ether_type == ETHERTYPE_JUMBO) { 194 /* 195 * Alteon jumbo frames. 196 * See 197 * 198 * http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01 199 * 200 * which indicates that, following the type field, 201 * there's an LLC header and payload. 202 */ 203 /* Try to print the LLC-layer header & higher layers */ 204 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 205 &extracted_ether_type) == 0) { 206 /* ether_type not known, print raw packet */ 207 if (!eflag) { 208 if (print_encap_header != NULL) 209 (*print_encap_header)(encap_header_arg); 210 ether_hdr_print((u_char *)ep, orig_length); 211 } 212 213 if (!suppress_default_print) 214 default_print(p, caplen); 215 } 216 } else { 217 if (ethertype_print(ether_type, p, length, caplen) == 0) { 218 /* ether_type not known, print raw packet */ 219 if (!eflag) { 220 if (print_encap_header != NULL) 221 (*print_encap_header)(encap_header_arg); 222 ether_hdr_print((u_char *)ep, orig_length); 223 } 224 225 if (!suppress_default_print) 226 default_print(p, caplen); 227 } 228 } 229 } 230 231 /* 232 * This is the top level routine of the printer. 'p' points 233 * to the ether header of the packet, 'h->ts' is the timestamp, 234 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 235 * is the number of bytes actually captured. 236 */ 237 u_int 238 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 239 { 240 ether_print(p, h->len, h->caplen, NULL, NULL); 241 242 return (ETHER_HDRLEN); 243 } 244 245 /* 246 * Prints the packet payload, given an Ethernet type code for the payload's 247 * protocol. 248 * 249 * Returns non-zero if it can do so, zero if the ethertype is unknown. 250 */ 251 252 int 253 ethertype_print(u_short ether_type, const u_char *p, u_int length, u_int caplen) 254 { 255 switch (ether_type) { 256 257 case ETHERTYPE_IP: 258 ip_print(gndo, p, length); 259 return (1); 260 261 #ifdef INET6 262 case ETHERTYPE_IPV6: 263 ip6_print(p, length); 264 return (1); 265 #endif /*INET6*/ 266 267 case ETHERTYPE_ARP: 268 case ETHERTYPE_REVARP: 269 arp_print(gndo, p, length, caplen); 270 return (1); 271 272 case ETHERTYPE_DN: 273 decnet_print(p, length, caplen); 274 return (1); 275 276 case ETHERTYPE_ATALK: 277 if (vflag) 278 fputs("et1 ", stdout); 279 atalk_print(p, length); 280 return (1); 281 282 case ETHERTYPE_AARP: 283 aarp_print(p, length); 284 return (1); 285 286 case ETHERTYPE_IPX: 287 printf("(NOV-ETHII) "); 288 ipx_print(p, length); 289 return (1); 290 291 case ETHERTYPE_ISO: 292 isoclns_print(p+1, length-1, length-1); 293 return(1); 294 295 case ETHERTYPE_PPPOED: 296 case ETHERTYPE_PPPOES: 297 case ETHERTYPE_PPPOED2: 298 case ETHERTYPE_PPPOES2: 299 pppoe_print(p, length); 300 return (1); 301 302 case ETHERTYPE_EAPOL: 303 eap_print(gndo, p, length); 304 return (1); 305 306 case ETHERTYPE_RRCP: 307 rrcp_print(gndo, p - 14 , length + 14); 308 return (1); 309 310 case ETHERTYPE_PPP: 311 if (length) { 312 printf(": "); 313 ppp_print(p, length); 314 } 315 return (1); 316 317 case ETHERTYPE_MPCP: 318 mpcp_print(p, length); 319 return (1); 320 321 case ETHERTYPE_SLOW: 322 slow_print(p, length); 323 return (1); 324 325 case ETHERTYPE_CFM: 326 case ETHERTYPE_CFM_OLD: 327 cfm_print(p, length); 328 return (1); 329 330 case ETHERTYPE_LLDP: 331 lldp_print(p, length); 332 return (1); 333 334 case ETHERTYPE_LOOPBACK: 335 return (1); 336 337 case ETHERTYPE_MPLS: 338 case ETHERTYPE_MPLS_MULTI: 339 mpls_print(p, length); 340 return (1); 341 342 case ETHERTYPE_LAT: 343 case ETHERTYPE_SCA: 344 case ETHERTYPE_MOPRC: 345 case ETHERTYPE_MOPDL: 346 /* default_print for now */ 347 default: 348 return (0); 349 } 350 } 351 352 353 /* 354 * Local Variables: 355 * c-style: whitesmith 356 * c-basic-offset: 8 357 * End: 358 */ 359 360