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 1.95.2.2 2005/07/01 16:16:30 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_PPPOED, "PPPoE D" }, 71 { ETHERTYPE_PPPOES, "PPPoE S" }, 72 { ETHERTYPE_EAPOL, "EAPOL" }, 73 { ETHERTYPE_JUMBO, "Jumbo" }, 74 { ETHERTYPE_LOOPBACK, "Loopback" }, 75 { ETHERTYPE_ISO, "OSI" }, 76 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 77 { 0, NULL} 78 }; 79 80 static inline void 81 ether_hdr_print(register const u_char *bp, u_int length) 82 { 83 register const struct ether_header *ep; 84 ep = (const struct ether_header *)bp; 85 86 (void)printf("%s > %s", 87 etheraddr_string(ESRC(ep)), 88 etheraddr_string(EDST(ep))); 89 90 if (!qflag) { 91 if (ntohs(ep->ether_type) <= ETHERMTU) 92 (void)printf(", 802.3"); 93 else 94 (void)printf(", ethertype %s (0x%04x)", 95 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 96 ntohs(ep->ether_type)); 97 } else { 98 if (ntohs(ep->ether_type) <= ETHERMTU) 99 (void)printf(", 802.3"); 100 else 101 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 102 } 103 104 (void)printf(", length %u: ", length); 105 } 106 107 void 108 ether_print(const u_char *p, u_int length, u_int caplen) 109 { 110 struct ether_header *ep; 111 u_short ether_type; 112 u_short extracted_ether_type; 113 114 if (caplen < ETHER_HDRLEN) { 115 printf("[|ether]"); 116 return; 117 } 118 119 if (eflag) 120 ether_hdr_print(p, length); 121 122 length -= ETHER_HDRLEN; 123 caplen -= ETHER_HDRLEN; 124 ep = (struct ether_header *)p; 125 p += ETHER_HDRLEN; 126 127 ether_type = ntohs(ep->ether_type); 128 129 /* 130 * Is it (gag) an 802.3 encapsulation? 131 */ 132 extracted_ether_type = 0; 133 if (ether_type <= ETHERMTU) { 134 /* Try to print the LLC-layer header & higher layers */ 135 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 136 &extracted_ether_type) == 0) { 137 /* ether_type not known, print raw packet */ 138 if (!eflag) 139 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 140 141 if (!xflag && !qflag) 142 default_print(p, caplen); 143 } 144 } else if (ether_encap_print(ether_type, p, length, caplen, 145 &extracted_ether_type) == 0) { 146 /* ether_type not known, print raw packet */ 147 if (!eflag) 148 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 149 150 if (!xflag && !qflag) 151 default_print(p, caplen); 152 } 153 } 154 155 /* 156 * This is the top level routine of the printer. 'p' points 157 * to the ether header of the packet, 'h->ts' is the timestamp, 158 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 159 * is the number of bytes actually captured. 160 */ 161 u_int 162 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 163 { 164 ether_print(p, h->len, h->caplen); 165 166 return (ETHER_HDRLEN); 167 } 168 169 /* 170 * Prints the packet encapsulated in an Ethernet data segment 171 * (or an equivalent encapsulation), given the Ethernet type code. 172 * 173 * Returns non-zero if it can do so, zero if the ethertype is unknown. 174 * 175 * The Ethernet type code is passed through a pointer; if it was 176 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 177 * the 802.1Q payload, for the benefit of lower layers that might 178 * want to know what it is. 179 */ 180 181 int 182 ether_encap_print(u_short ether_type, const u_char *p, 183 u_int length, u_int caplen, u_short *extracted_ether_type) 184 { 185 recurse: 186 *extracted_ether_type = ether_type; 187 188 switch (ether_type) { 189 190 case ETHERTYPE_IP: 191 ip_print(gndo, p, length); 192 return (1); 193 194 #ifdef INET6 195 case ETHERTYPE_IPV6: 196 ip6_print(p, length); 197 return (1); 198 #endif /*INET6*/ 199 200 case ETHERTYPE_ARP: 201 case ETHERTYPE_REVARP: 202 arp_print(gndo, p, length, caplen); 203 return (1); 204 205 case ETHERTYPE_DN: 206 decnet_print(p, length, caplen); 207 return (1); 208 209 case ETHERTYPE_ATALK: 210 if (vflag) 211 fputs("et1 ", stdout); 212 atalk_print(p, length); 213 return (1); 214 215 case ETHERTYPE_AARP: 216 aarp_print(p, length); 217 return (1); 218 219 case ETHERTYPE_IPX: 220 printf("(NOV-ETHII) "); 221 ipx_print(p, length); 222 return (1); 223 224 case ETHERTYPE_8021Q: 225 if (eflag) 226 printf("vlan %u, p %u%s, ", 227 ntohs(*(u_int16_t *)p) & 0xfff, 228 ntohs(*(u_int16_t *)p) >> 13, 229 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 230 231 ether_type = ntohs(*(u_int16_t *)(p + 2)); 232 p += 4; 233 length -= 4; 234 caplen -= 4; 235 236 if (ether_type > ETHERMTU) { 237 if (eflag) 238 printf("ethertype %s, ", 239 tok2str(ethertype_values,"0x%04x", ether_type)); 240 goto recurse; 241 } 242 243 *extracted_ether_type = 0; 244 245 if (llc_print(p, length, caplen, p - 18, p - 12, 246 extracted_ether_type) == 0) { 247 ether_hdr_print(p - 18, length + 4); 248 } 249 250 if (!xflag && !qflag) 251 default_print(p - 18, caplen + 4); 252 253 return (1); 254 255 case ETHERTYPE_JUMBO: 256 ether_type = ntohs(*(u_int16_t *)(p)); 257 p += 2; 258 length -= 2; 259 caplen -= 2; 260 261 if (ether_type > ETHERMTU) { 262 if (eflag) 263 printf("ethertype %s, ", 264 tok2str(ethertype_values,"0x%04x", ether_type)); 265 goto recurse; 266 } 267 268 *extracted_ether_type = 0; 269 270 if (llc_print(p, length, caplen, p - 16, p - 10, 271 extracted_ether_type) == 0) { 272 ether_hdr_print(p - 16, length + 2); 273 } 274 275 if (!xflag && !qflag) 276 default_print(p - 16, caplen + 2); 277 278 return (1); 279 280 case ETHERTYPE_ISO: 281 isoclns_print(p+1, length-1, length-1); 282 return(1); 283 284 case ETHERTYPE_PPPOED: 285 case ETHERTYPE_PPPOES: 286 case ETHERTYPE_PPPOED2: 287 case ETHERTYPE_PPPOES2: 288 pppoe_print(p, length); 289 return (1); 290 291 case ETHERTYPE_EAPOL: 292 eap_print(gndo, p, length); 293 return (1); 294 295 case ETHERTYPE_PPP: 296 if (length) { 297 printf(": "); 298 ppp_print(p, length); 299 } 300 return (1); 301 302 case ETHERTYPE_LOOPBACK: 303 return (1); 304 305 case ETHERTYPE_MPLS: 306 case ETHERTYPE_MPLS_MULTI: 307 mpls_print(p, length); 308 return (1); 309 310 case ETHERTYPE_LAT: 311 case ETHERTYPE_SCA: 312 case ETHERTYPE_MOPRC: 313 case ETHERTYPE_MOPDL: 314 /* default_print for now */ 315 default: 316 return (0); 317 } 318 } 319 320 321 /* 322 * Local Variables: 323 * c-style: whitesmith 324 * c-basic-offset: 8 325 * End: 326 */ 327 328