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 1.95.2.4 2005/07/10 14:47:57 hannes 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_SLOW, "Slow Protocols" }, 69 { ETHERTYPE_PPPOED, "PPPoE D" }, 70 { ETHERTYPE_PPPOES, "PPPoE S" }, 71 { ETHERTYPE_EAPOL, "EAPOL" }, 72 { ETHERTYPE_JUMBO, "Jumbo" }, 73 { ETHERTYPE_LOOPBACK, "Loopback" }, 74 { ETHERTYPE_ISO, "OSI" }, 75 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 76 { 0, NULL} 77 }; 78 79 static inline void 80 ether_hdr_print(register const u_char *bp, u_int length) 81 { 82 register const struct ether_header *ep; 83 ep = (const struct ether_header *)bp; 84 85 (void)printf("%s > %s", 86 etheraddr_string(ESRC(ep)), 87 etheraddr_string(EDST(ep))); 88 89 if (!qflag) { 90 if (ntohs(ep->ether_type) <= ETHERMTU) 91 (void)printf(", 802.3"); 92 else 93 (void)printf(", ethertype %s (0x%04x)", 94 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 95 ntohs(ep->ether_type)); 96 } else { 97 if (ntohs(ep->ether_type) <= ETHERMTU) 98 (void)printf(", 802.3"); 99 else 100 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 101 } 102 103 (void)printf(", length %u: ", length); 104 } 105 106 void 107 ether_print(const u_char *p, u_int length, u_int caplen) 108 { 109 struct ether_header *ep; 110 u_short ether_type; 111 u_short extracted_ether_type; 112 113 if (caplen < ETHER_HDRLEN) { 114 printf("[|ether]"); 115 return; 116 } 117 118 if (eflag) 119 ether_hdr_print(p, length); 120 121 length -= ETHER_HDRLEN; 122 caplen -= ETHER_HDRLEN; 123 ep = (struct ether_header *)p; 124 p += ETHER_HDRLEN; 125 126 ether_type = ntohs(ep->ether_type); 127 128 /* 129 * Is it (gag) an 802.3 encapsulation? 130 */ 131 extracted_ether_type = 0; 132 if (ether_type <= ETHERMTU) { 133 /* Try to print the LLC-layer header & higher layers */ 134 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 135 &extracted_ether_type) == 0) { 136 /* ether_type not known, print raw packet */ 137 if (!eflag) 138 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 139 140 if (!suppress_default_print) 141 default_print(p, caplen); 142 } 143 } else if (ether_encap_print(ether_type, p, length, caplen, 144 &extracted_ether_type) == 0) { 145 /* ether_type not known, print raw packet */ 146 if (!eflag) 147 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 148 149 if (!suppress_default_print) 150 default_print(p, caplen); 151 } 152 } 153 154 /* 155 * This is the top level routine of the printer. 'p' points 156 * to the ether header of the packet, 'h->ts' is the timestamp, 157 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 158 * is the number of bytes actually captured. 159 */ 160 u_int 161 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 162 { 163 ether_print(p, h->len, h->caplen); 164 165 return (ETHER_HDRLEN); 166 } 167 168 /* 169 * Prints the packet encapsulated in an Ethernet data segment 170 * (or an equivalent encapsulation), given the Ethernet type code. 171 * 172 * Returns non-zero if it can do so, zero if the ethertype is unknown. 173 * 174 * The Ethernet type code is passed through a pointer; if it was 175 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 176 * the 802.1Q payload, for the benefit of lower layers that might 177 * want to know what it is. 178 */ 179 180 int 181 ether_encap_print(u_short ether_type, const u_char *p, 182 u_int length, u_int caplen, u_short *extracted_ether_type) 183 { 184 recurse: 185 *extracted_ether_type = ether_type; 186 187 switch (ether_type) { 188 189 case ETHERTYPE_IP: 190 ip_print(gndo, p, length); 191 return (1); 192 193 #ifdef INET6 194 case ETHERTYPE_IPV6: 195 ip6_print(p, length); 196 return (1); 197 #endif /*INET6*/ 198 199 case ETHERTYPE_ARP: 200 case ETHERTYPE_REVARP: 201 arp_print(gndo, p, length, caplen); 202 return (1); 203 204 case ETHERTYPE_DN: 205 decnet_print(p, length, caplen); 206 return (1); 207 208 case ETHERTYPE_ATALK: 209 if (vflag) 210 fputs("et1 ", stdout); 211 atalk_print(p, length); 212 return (1); 213 214 case ETHERTYPE_AARP: 215 aarp_print(p, length); 216 return (1); 217 218 case ETHERTYPE_IPX: 219 printf("(NOV-ETHII) "); 220 ipx_print(p, length); 221 return (1); 222 223 case ETHERTYPE_8021Q: 224 if (eflag) 225 printf("vlan %u, p %u%s, ", 226 ntohs(*(u_int16_t *)p) & 0xfff, 227 ntohs(*(u_int16_t *)p) >> 13, 228 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 229 230 ether_type = ntohs(*(u_int16_t *)(p + 2)); 231 p += 4; 232 length -= 4; 233 caplen -= 4; 234 235 if (ether_type > ETHERMTU) { 236 if (eflag) 237 printf("ethertype %s, ", 238 tok2str(ethertype_values,"0x%04x", ether_type)); 239 goto recurse; 240 } 241 242 *extracted_ether_type = 0; 243 244 if (llc_print(p, length, caplen, p - 18, p - 12, 245 extracted_ether_type) == 0) { 246 ether_hdr_print(p - 18, length + 4); 247 } 248 249 if (!suppress_default_print) 250 default_print(p - 18, caplen + 4); 251 252 return (1); 253 254 case ETHERTYPE_JUMBO: 255 ether_type = ntohs(*(u_int16_t *)(p)); 256 p += 2; 257 length -= 2; 258 caplen -= 2; 259 260 if (ether_type > ETHERMTU) { 261 if (eflag) 262 printf("ethertype %s, ", 263 tok2str(ethertype_values,"0x%04x", ether_type)); 264 goto recurse; 265 } 266 267 *extracted_ether_type = 0; 268 269 if (llc_print(p, length, caplen, p - 16, p - 10, 270 extracted_ether_type) == 0) { 271 ether_hdr_print(p - 16, length + 2); 272 } 273 274 if (!suppress_default_print) 275 default_print(p - 16, caplen + 2); 276 277 return (1); 278 279 case ETHERTYPE_ISO: 280 isoclns_print(p+1, length-1, length-1); 281 return(1); 282 283 case ETHERTYPE_PPPOED: 284 case ETHERTYPE_PPPOES: 285 pppoe_print(p, length); 286 return (1); 287 288 case ETHERTYPE_EAPOL: 289 eap_print(gndo, p, length); 290 return (1); 291 292 case ETHERTYPE_PPP: 293 if (length) { 294 printf(": "); 295 ppp_print(p, length); 296 } 297 return (1); 298 299 case ETHERTYPE_SLOW: 300 slow_print(p, length); 301 return (1); 302 303 case ETHERTYPE_LOOPBACK: 304 return (1); 305 306 case ETHERTYPE_MPLS: 307 case ETHERTYPE_MPLS_MULTI: 308 mpls_print(p, length); 309 return (1); 310 311 case ETHERTYPE_LAT: 312 case ETHERTYPE_SCA: 313 case ETHERTYPE_MOPRC: 314 case ETHERTYPE_MOPDL: 315 /* default_print for now */ 316 default: 317 return (0); 318 } 319 } 320 321 322 /* 323 * Local Variables: 324 * c-style: whitesmith 325 * c-basic-offset: 8 326 * End: 327 */ 328 329