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 1.95.2.4 2005/07/10 14:47:57 hannes 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_SLOW, "Slow Protocols" }, 71 { ETHERTYPE_PPPOED, "PPPoE D" }, 72 { ETHERTYPE_PPPOES, "PPPoE S" }, 73 { ETHERTYPE_EAPOL, "EAPOL" }, 74 { ETHERTYPE_JUMBO, "Jumbo" }, 75 { ETHERTYPE_LOOPBACK, "Loopback" }, 76 { ETHERTYPE_ISO, "OSI" }, 77 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 78 { 0, NULL} 79 }; 80 81 static inline void 82 ether_hdr_print(register const u_char *bp, u_int length) 83 { 84 register const struct ether_header *ep; 85 ep = (const struct ether_header *)bp; 86 87 (void)printf("%s > %s", 88 etheraddr_string(ESRC(ep)), 89 etheraddr_string(EDST(ep))); 90 91 if (!qflag) { 92 if (ntohs(ep->ether_type) <= ETHERMTU) 93 (void)printf(", 802.3"); 94 else 95 (void)printf(", ethertype %s (0x%04x)", 96 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 97 ntohs(ep->ether_type)); 98 } else { 99 if (ntohs(ep->ether_type) <= ETHERMTU) 100 (void)printf(", 802.3"); 101 else 102 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 103 } 104 105 (void)printf(", length %u: ", length); 106 } 107 108 void 109 ether_print(const u_char *p, u_int length, u_int caplen) 110 { 111 struct ether_header *ep; 112 u_short ether_type; 113 u_short extracted_ether_type; 114 115 if (caplen < ETHER_HDRLEN) { 116 printf("[|ether]"); 117 return; 118 } 119 120 if (eflag) 121 ether_hdr_print(p, length); 122 123 length -= ETHER_HDRLEN; 124 caplen -= ETHER_HDRLEN; 125 ep = (struct ether_header *)p; 126 p += ETHER_HDRLEN; 127 128 ether_type = ntohs(ep->ether_type); 129 130 /* 131 * Is it (gag) an 802.3 encapsulation? 132 */ 133 extracted_ether_type = 0; 134 if (ether_type <= ETHERMTU) { 135 /* Try to print the LLC-layer header & higher layers */ 136 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 137 &extracted_ether_type) == 0) { 138 /* ether_type not known, print raw packet */ 139 if (!eflag) 140 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 141 142 if (!suppress_default_print) 143 default_print(p, caplen); 144 } 145 } else if (ether_encap_print(ether_type, p, length, caplen, 146 &extracted_ether_type) == 0) { 147 /* ether_type not known, print raw packet */ 148 if (!eflag) 149 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 150 151 if (!suppress_default_print) 152 default_print(p, caplen); 153 } 154 } 155 156 /* 157 * This is the top level routine of the printer. 'p' points 158 * to the ether header of the packet, 'h->ts' is the timestamp, 159 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 160 * is the number of bytes actually captured. 161 */ 162 u_int 163 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 164 { 165 ether_print(p, h->len, h->caplen); 166 167 return (ETHER_HDRLEN); 168 } 169 170 /* 171 * Prints the packet encapsulated in an Ethernet data segment 172 * (or an equivalent encapsulation), given the Ethernet type code. 173 * 174 * Returns non-zero if it can do so, zero if the ethertype is unknown. 175 * 176 * The Ethernet type code is passed through a pointer; if it was 177 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 178 * the 802.1Q payload, for the benefit of lower layers that might 179 * want to know what it is. 180 */ 181 182 int 183 ether_encap_print(u_short ether_type, const u_char *p, 184 u_int length, u_int caplen, u_short *extracted_ether_type) 185 { 186 recurse: 187 *extracted_ether_type = ether_type; 188 189 switch (ether_type) { 190 191 case ETHERTYPE_IP: 192 ip_print(gndo, p, length); 193 return (1); 194 195 #ifdef INET6 196 case ETHERTYPE_IPV6: 197 ip6_print(p, length); 198 return (1); 199 #endif /*INET6*/ 200 201 case ETHERTYPE_ARP: 202 case ETHERTYPE_REVARP: 203 arp_print(gndo, p, length, caplen); 204 return (1); 205 206 case ETHERTYPE_DN: 207 decnet_print(p, length, caplen); 208 return (1); 209 210 case ETHERTYPE_ATALK: 211 if (vflag) 212 fputs("et1 ", stdout); 213 atalk_print(p, length); 214 return (1); 215 216 case ETHERTYPE_AARP: 217 aarp_print(p, length); 218 return (1); 219 220 case ETHERTYPE_IPX: 221 printf("(NOV-ETHII) "); 222 ipx_print(p, length); 223 return (1); 224 225 case ETHERTYPE_8021Q: 226 if (eflag) 227 printf("vlan %u, p %u%s, ", 228 ntohs(*(u_int16_t *)p) & 0xfff, 229 ntohs(*(u_int16_t *)p) >> 13, 230 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 231 232 ether_type = ntohs(*(u_int16_t *)(p + 2)); 233 p += 4; 234 length -= 4; 235 caplen -= 4; 236 237 if (ether_type > ETHERMTU) { 238 if (eflag) 239 printf("ethertype %s, ", 240 tok2str(ethertype_values,"0x%04x", ether_type)); 241 goto recurse; 242 } 243 244 *extracted_ether_type = 0; 245 246 if (llc_print(p, length, caplen, p - 18, p - 12, 247 extracted_ether_type) == 0) { 248 ether_hdr_print(p - 18, length + 4); 249 } 250 251 if (!suppress_default_print) 252 default_print(p - 18, caplen + 4); 253 254 return (1); 255 256 case ETHERTYPE_JUMBO: 257 ether_type = ntohs(*(u_int16_t *)(p)); 258 p += 2; 259 length -= 2; 260 caplen -= 2; 261 262 if (ether_type > ETHERMTU) { 263 if (eflag) 264 printf("ethertype %s, ", 265 tok2str(ethertype_values,"0x%04x", ether_type)); 266 goto recurse; 267 } 268 269 *extracted_ether_type = 0; 270 271 if (llc_print(p, length, caplen, p - 16, p - 10, 272 extracted_ether_type) == 0) { 273 ether_hdr_print(p - 16, length + 2); 274 } 275 276 if (!suppress_default_print) 277 default_print(p - 16, caplen + 2); 278 279 return (1); 280 281 case ETHERTYPE_ISO: 282 isoclns_print(p+1, length-1, length-1); 283 return(1); 284 285 case ETHERTYPE_PPPOED: 286 case ETHERTYPE_PPPOES: 287 case ETHERTYPE_PPPOED2: 288 case ETHERTYPE_PPPOES2: 289 pppoe_print(p, length); 290 return (1); 291 292 case ETHERTYPE_EAPOL: 293 eap_print(gndo, p, length); 294 return (1); 295 296 case ETHERTYPE_PPP: 297 if (length) { 298 printf(": "); 299 ppp_print(p, length); 300 } 301 return (1); 302 303 case ETHERTYPE_SLOW: 304 slow_print(p, length); 305 return (1); 306 307 case ETHERTYPE_LOOPBACK: 308 return (1); 309 310 case ETHERTYPE_MPLS: 311 case ETHERTYPE_MPLS_MULTI: 312 mpls_print(p, length); 313 return (1); 314 315 case ETHERTYPE_LAT: 316 case ETHERTYPE_SCA: 317 case ETHERTYPE_MOPRC: 318 case ETHERTYPE_MOPDL: 319 /* default_print for now */ 320 default: 321 return (0); 322 } 323 } 324 325 326 /* 327 * Local Variables: 328 * c-style: whitesmith 329 * c-basic-offset: 8 330 * End: 331 */ 332 333