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 1.105.2.1 2008-02-06 10:49:22 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 "addrtoname.h" 39 #include "ethertype.h" 40 41 #include "ether.h" 42 43 const struct tok ethertype_values[] = { 44 { ETHERTYPE_IP, "IPv4" }, 45 { ETHERTYPE_MPLS, "MPLS unicast" }, 46 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 47 { ETHERTYPE_IPV6, "IPv6" }, 48 { ETHERTYPE_8021Q, "802.1Q" }, 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_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 ep = (const struct ether_header *)bp; 91 92 (void)printf("%s > %s", 93 etheraddr_string(ESRC(ep)), 94 etheraddr_string(EDST(ep))); 95 96 if (!qflag) { 97 if (ntohs(ep->ether_type) <= ETHERMTU) 98 (void)printf(", 802.3"); 99 else 100 (void)printf(", ethertype %s (0x%04x)", 101 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 102 ntohs(ep->ether_type)); 103 } else { 104 if (ntohs(ep->ether_type) <= ETHERMTU) 105 (void)printf(", 802.3"); 106 else 107 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 108 } 109 110 (void)printf(", length %u: ", length); 111 } 112 113 void 114 ether_print(const u_char *p, u_int length, u_int caplen) 115 { 116 struct ether_header *ep; 117 u_short ether_type; 118 u_short extracted_ether_type; 119 120 if (caplen < ETHER_HDRLEN) { 121 printf("[|ether]"); 122 return; 123 } 124 125 if (eflag) 126 ether_hdr_print(p, length); 127 128 length -= ETHER_HDRLEN; 129 caplen -= ETHER_HDRLEN; 130 ep = (struct ether_header *)p; 131 p += ETHER_HDRLEN; 132 133 ether_type = ntohs(ep->ether_type); 134 135 /* 136 * Is it (gag) an 802.3 encapsulation? 137 */ 138 if (ether_type <= ETHERMTU) { 139 /* Try to print the LLC-layer header & higher layers */ 140 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 141 &extracted_ether_type) == 0) { 142 /* ether_type not known, print raw packet */ 143 if (!eflag) 144 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 145 146 if (!suppress_default_print) 147 default_print(p, caplen); 148 } 149 } else if (ether_encap_print(ether_type, p, length, caplen, 150 &extracted_ether_type) == 0) { 151 /* ether_type not known, print raw packet */ 152 if (!eflag) 153 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 154 155 if (!suppress_default_print) 156 default_print(p, caplen); 157 } 158 } 159 160 /* 161 * This is the top level routine of the printer. 'p' points 162 * to the ether header of the packet, 'h->ts' is the timestamp, 163 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 164 * is the number of bytes actually captured. 165 */ 166 u_int 167 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 168 { 169 ether_print(p, h->len, h->caplen); 170 171 return (ETHER_HDRLEN); 172 } 173 174 /* 175 * Prints the packet encapsulated in an Ethernet data segment 176 * (or an equivalent encapsulation), given the Ethernet type code. 177 * 178 * Returns non-zero if it can do so, zero if the ethertype is unknown. 179 * 180 * The Ethernet type code is passed through a pointer; if it was 181 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 182 * the 802.1Q payload, for the benefit of lower layers that might 183 * want to know what it is. 184 */ 185 186 int 187 ether_encap_print(u_short ether_type, const u_char *p, 188 u_int length, u_int caplen, u_short *extracted_ether_type) 189 { 190 recurse: 191 *extracted_ether_type = ether_type; 192 193 switch (ether_type) { 194 195 case ETHERTYPE_IP: 196 ip_print(gndo, p, length); 197 return (1); 198 199 #ifdef INET6 200 case ETHERTYPE_IPV6: 201 ip6_print(p, length); 202 return (1); 203 #endif /*INET6*/ 204 205 case ETHERTYPE_ARP: 206 case ETHERTYPE_REVARP: 207 arp_print(gndo, p, length, caplen); 208 return (1); 209 210 case ETHERTYPE_DN: 211 decnet_print(p, length, caplen); 212 return (1); 213 214 case ETHERTYPE_ATALK: 215 if (vflag) 216 fputs("et1 ", stdout); 217 atalk_print(p, length); 218 return (1); 219 220 case ETHERTYPE_AARP: 221 aarp_print(p, length); 222 return (1); 223 224 case ETHERTYPE_IPX: 225 printf("(NOV-ETHII) "); 226 ipx_print(p, length); 227 return (1); 228 229 case ETHERTYPE_8021Q: 230 if (eflag) 231 printf("vlan %u, p %u%s, ", 232 ntohs(*(u_int16_t *)p) & 0xfff, 233 ntohs(*(u_int16_t *)p) >> 13, 234 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 235 236 ether_type = ntohs(*(u_int16_t *)(p + 2)); 237 p += 4; 238 length -= 4; 239 caplen -= 4; 240 241 if (ether_type > ETHERMTU) { 242 if (eflag) 243 printf("ethertype %s, ", 244 tok2str(ethertype_values,"0x%04x", ether_type)); 245 goto recurse; 246 } 247 248 *extracted_ether_type = 0; 249 250 if (llc_print(p, length, caplen, p - 18, p - 12, 251 extracted_ether_type) == 0) { 252 ether_hdr_print(p - 18, length + 4); 253 254 if (!suppress_default_print) { 255 default_print(p - 18, caplen + 4); 256 } 257 } 258 259 260 return (1); 261 262 case ETHERTYPE_JUMBO: 263 ether_type = ntohs(*(u_int16_t *)(p)); 264 p += 2; 265 length -= 2; 266 caplen -= 2; 267 268 if (ether_type > ETHERMTU) { 269 if (eflag) 270 printf("ethertype %s, ", 271 tok2str(ethertype_values,"0x%04x", ether_type)); 272 goto recurse; 273 } 274 275 *extracted_ether_type = 0; 276 277 if (llc_print(p, length, caplen, p - 16, p - 10, 278 extracted_ether_type) == 0) { 279 ether_hdr_print(p - 16, length + 2); 280 281 if (!suppress_default_print) { 282 default_print(p - 16, caplen + 2); 283 } 284 } 285 286 return (1); 287 288 case ETHERTYPE_ISO: 289 isoclns_print(p+1, length-1, length-1); 290 return(1); 291 292 case ETHERTYPE_PPPOED: 293 case ETHERTYPE_PPPOES: 294 case ETHERTYPE_PPPOED2: 295 case ETHERTYPE_PPPOES2: 296 pppoe_print(p, length); 297 return (1); 298 299 case ETHERTYPE_EAPOL: 300 eap_print(gndo, p, length); 301 return (1); 302 303 case ETHERTYPE_RRCP: 304 rrcp_print(gndo, p - 14 , length + 14); 305 return (1); 306 307 case ETHERTYPE_PPP: 308 if (length) { 309 printf(": "); 310 ppp_print(p, length); 311 } 312 return (1); 313 314 case ETHERTYPE_MPCP: 315 mpcp_print(p, length); 316 return (1); 317 318 case ETHERTYPE_SLOW: 319 slow_print(p, length); 320 return (1); 321 322 case ETHERTYPE_CFM: 323 case ETHERTYPE_CFM_OLD: 324 cfm_print(p, length); 325 return (1); 326 327 case ETHERTYPE_LLDP: 328 lldp_print(p, length); 329 return (1); 330 331 case ETHERTYPE_LOOPBACK: 332 return (1); 333 334 case ETHERTYPE_MPLS: 335 case ETHERTYPE_MPLS_MULTI: 336 mpls_print(p, length); 337 return (1); 338 339 case ETHERTYPE_LAT: 340 case ETHERTYPE_SCA: 341 case ETHERTYPE_MOPRC: 342 case ETHERTYPE_MOPDL: 343 /* default_print for now */ 344 default: 345 return (0); 346 } 347 } 348 349 350 /* 351 * Local Variables: 352 * c-style: whitesmith 353 * c-basic-offset: 8 354 * End: 355 */ 356 357