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 1.105.2.1 2008-02-06 10:49:22 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 "addrtoname.h" 37 #include "ethertype.h" 38 39 #include "ether.h" 40 41 const struct tok ethertype_values[] = { 42 { ETHERTYPE_IP, "IPv4" }, 43 { ETHERTYPE_MPLS, "MPLS unicast" }, 44 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 45 { ETHERTYPE_IPV6, "IPv6" }, 46 { ETHERTYPE_8021Q, "802.1Q" }, 47 { ETHERTYPE_VMAN, "VMAN" }, 48 { ETHERTYPE_PUP, "PUP" }, 49 { ETHERTYPE_ARP, "ARP"}, 50 { ETHERTYPE_REVARP, "Reverse ARP"}, 51 { ETHERTYPE_NS, "NS" }, 52 { ETHERTYPE_SPRITE, "Sprite" }, 53 { ETHERTYPE_TRAIL, "Trail" }, 54 { ETHERTYPE_MOPDL, "MOP DL" }, 55 { ETHERTYPE_MOPRC, "MOP RC" }, 56 { ETHERTYPE_DN, "DN" }, 57 { ETHERTYPE_LAT, "LAT" }, 58 { ETHERTYPE_SCA, "SCA" }, 59 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 60 { ETHERTYPE_DECDNS, "DEC DNS" }, 61 { ETHERTYPE_DECDTS, "DEC DTS" }, 62 { ETHERTYPE_VEXP, "VEXP" }, 63 { ETHERTYPE_VPROD, "VPROD" }, 64 { ETHERTYPE_ATALK, "Appletalk" }, 65 { ETHERTYPE_AARP, "Appletalk ARP" }, 66 { ETHERTYPE_IPX, "IPX" }, 67 { ETHERTYPE_PPP, "PPP" }, 68 { ETHERTYPE_MPCP, "MPCP" }, 69 { ETHERTYPE_SLOW, "Slow Protocols" }, 70 { ETHERTYPE_PPPOED, "PPPoE D" }, 71 { ETHERTYPE_PPPOES, "PPPoE S" }, 72 { ETHERTYPE_EAPOL, "EAPOL" }, 73 { ETHERTYPE_RRCP, "RRCP" }, 74 { ETHERTYPE_JUMBO, "Jumbo" }, 75 { ETHERTYPE_LOOPBACK, "Loopback" }, 76 { ETHERTYPE_ISO, "OSI" }, 77 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 78 { ETHERTYPE_CFM_OLD, "CFM (old)" }, 79 { ETHERTYPE_CFM, "CFM" }, 80 { ETHERTYPE_LLDP, "LLDP" }, 81 { 0, NULL} 82 }; 83 84 static inline void 85 ether_hdr_print(register const u_char *bp, u_int length) 86 { 87 register const struct ether_header *ep; 88 ep = (const struct ether_header *)bp; 89 90 (void)printf("%s > %s", 91 etheraddr_string(ESRC(ep)), 92 etheraddr_string(EDST(ep))); 93 94 if (!qflag) { 95 if (ntohs(ep->ether_type) <= ETHERMTU) 96 (void)printf(", 802.3"); 97 else 98 (void)printf(", ethertype %s (0x%04x)", 99 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 100 ntohs(ep->ether_type)); 101 } else { 102 if (ntohs(ep->ether_type) <= ETHERMTU) 103 (void)printf(", 802.3"); 104 else 105 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 106 } 107 108 (void)printf(", length %u: ", length); 109 } 110 111 void 112 ether_print(const u_char *p, u_int length, u_int caplen) 113 { 114 struct ether_header *ep; 115 u_short ether_type; 116 u_short extracted_ether_type; 117 118 if (caplen < ETHER_HDRLEN) { 119 printf("[|ether]"); 120 return; 121 } 122 123 if (eflag) 124 ether_hdr_print(p, length); 125 126 length -= ETHER_HDRLEN; 127 caplen -= ETHER_HDRLEN; 128 ep = (struct ether_header *)p; 129 p += ETHER_HDRLEN; 130 131 ether_type = ntohs(ep->ether_type); 132 133 /* 134 * Is it (gag) an 802.3 encapsulation? 135 */ 136 if (ether_type <= ETHERMTU) { 137 /* Try to print the LLC-layer header & higher layers */ 138 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 139 &extracted_ether_type) == 0) { 140 /* ether_type not known, print raw packet */ 141 if (!eflag) 142 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 143 144 if (!suppress_default_print) 145 default_print(p, caplen); 146 } 147 } else if (ether_encap_print(ether_type, p, length, caplen, 148 &extracted_ether_type) == 0) { 149 /* ether_type not known, print raw packet */ 150 if (!eflag) 151 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 152 153 if (!suppress_default_print) 154 default_print(p, caplen); 155 } 156 } 157 158 /* 159 * This is the top level routine of the printer. 'p' points 160 * to the ether header of the packet, 'h->ts' is the timestamp, 161 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 162 * is the number of bytes actually captured. 163 */ 164 u_int 165 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 166 { 167 ether_print(p, h->len, h->caplen); 168 169 return (ETHER_HDRLEN); 170 } 171 172 /* 173 * Prints the packet encapsulated in an Ethernet data segment 174 * (or an equivalent encapsulation), given the Ethernet type code. 175 * 176 * Returns non-zero if it can do so, zero if the ethertype is unknown. 177 * 178 * The Ethernet type code is passed through a pointer; if it was 179 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 180 * the 802.1Q payload, for the benefit of lower layers that might 181 * want to know what it is. 182 */ 183 184 int 185 ether_encap_print(u_short ether_type, const u_char *p, 186 u_int length, u_int caplen, u_short *extracted_ether_type) 187 { 188 recurse: 189 *extracted_ether_type = ether_type; 190 191 switch (ether_type) { 192 193 case ETHERTYPE_IP: 194 ip_print(gndo, p, length); 195 return (1); 196 197 #ifdef INET6 198 case ETHERTYPE_IPV6: 199 ip6_print(p, length); 200 return (1); 201 #endif /*INET6*/ 202 203 case ETHERTYPE_ARP: 204 case ETHERTYPE_REVARP: 205 arp_print(gndo, p, length, caplen); 206 return (1); 207 208 case ETHERTYPE_DN: 209 decnet_print(p, length, caplen); 210 return (1); 211 212 case ETHERTYPE_ATALK: 213 if (vflag) 214 fputs("et1 ", stdout); 215 atalk_print(p, length); 216 return (1); 217 218 case ETHERTYPE_AARP: 219 aarp_print(p, length); 220 return (1); 221 222 case ETHERTYPE_IPX: 223 printf("(NOV-ETHII) "); 224 ipx_print(p, length); 225 return (1); 226 227 case ETHERTYPE_8021Q: 228 if (eflag) 229 printf("vlan %u, p %u%s, ", 230 ntohs(*(u_int16_t *)p) & 0xfff, 231 ntohs(*(u_int16_t *)p) >> 13, 232 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 233 234 ether_type = ntohs(*(u_int16_t *)(p + 2)); 235 p += 4; 236 length -= 4; 237 caplen -= 4; 238 239 if (ether_type > ETHERMTU) { 240 if (eflag) 241 printf("ethertype %s, ", 242 tok2str(ethertype_values,"0x%04x", ether_type)); 243 goto recurse; 244 } 245 246 *extracted_ether_type = 0; 247 248 if (llc_print(p, length, caplen, p - 18, p - 12, 249 extracted_ether_type) == 0) { 250 ether_hdr_print(p - 18, length + 4); 251 252 if (!suppress_default_print) { 253 default_print(p - 18, caplen + 4); 254 } 255 } 256 257 258 return (1); 259 260 case ETHERTYPE_JUMBO: 261 ether_type = ntohs(*(u_int16_t *)(p)); 262 p += 2; 263 length -= 2; 264 caplen -= 2; 265 266 if (ether_type > ETHERMTU) { 267 if (eflag) 268 printf("ethertype %s, ", 269 tok2str(ethertype_values,"0x%04x", ether_type)); 270 goto recurse; 271 } 272 273 *extracted_ether_type = 0; 274 275 if (llc_print(p, length, caplen, p - 16, p - 10, 276 extracted_ether_type) == 0) { 277 ether_hdr_print(p - 16, length + 2); 278 279 if (!suppress_default_print) { 280 default_print(p - 16, caplen + 2); 281 } 282 } 283 284 return (1); 285 286 case ETHERTYPE_ISO: 287 isoclns_print(p+1, length-1, length-1); 288 return(1); 289 290 case ETHERTYPE_PPPOED: 291 case ETHERTYPE_PPPOES: 292 pppoe_print(p, length); 293 return (1); 294 295 case ETHERTYPE_EAPOL: 296 eap_print(gndo, p, length); 297 return (1); 298 299 case ETHERTYPE_RRCP: 300 rrcp_print(gndo, p - 14 , length + 14); 301 return (1); 302 303 case ETHERTYPE_PPP: 304 if (length) { 305 printf(": "); 306 ppp_print(p, length); 307 } 308 return (1); 309 310 case ETHERTYPE_MPCP: 311 mpcp_print(p, length); 312 return (1); 313 314 case ETHERTYPE_SLOW: 315 slow_print(p, length); 316 return (1); 317 318 case ETHERTYPE_CFM: 319 case ETHERTYPE_CFM_OLD: 320 cfm_print(p, length); 321 return (1); 322 323 case ETHERTYPE_LLDP: 324 lldp_print(p, length); 325 return (1); 326 327 case ETHERTYPE_LOOPBACK: 328 return (1); 329 330 case ETHERTYPE_MPLS: 331 case ETHERTYPE_MPLS_MULTI: 332 mpls_print(p, length); 333 return (1); 334 335 case ETHERTYPE_LAT: 336 case ETHERTYPE_SCA: 337 case ETHERTYPE_MOPRC: 338 case ETHERTYPE_MOPDL: 339 /* default_print for now */ 340 default: 341 return (0); 342 } 343 } 344 345 346 /* 347 * Local Variables: 348 * c-style: whitesmith 349 * c-basic-offset: 8 350 * End: 351 */ 352 353