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 2005/04/06 21:32:39 mcr 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 #include "llc.h" 43 44 const struct tok ethertype_values[] = { 45 /* not really ethertypes but PIDs that are used 46 in the SNAP printer - its more convenient 47 to put them into a single tokentable */ 48 { PID_RFC2684_ETH_FCS, "Ethernet + FCS" }, 49 { PID_RFC2684_ETH_NOFCS, "Ethernet no FCS" }, 50 { PID_RFC2684_802_4_FCS, "802.4 + FCS" }, 51 { PID_RFC2684_802_4_NOFCS, "w/o FCS" }, 52 { PID_RFC2684_802_5_FCS, "Tokenring + FCS" }, 53 { PID_RFC2684_802_5_NOFCS, "Tokenring no FCS" }, 54 { PID_RFC2684_FDDI_FCS, "FDDI + FCS" }, 55 { PID_RFC2684_FDDI_NOFCS, "FDDI no FCS" }, 56 { PID_RFC2684_802_6_FCS, "802.6 + FCS" }, 57 { PID_RFC2684_802_6_NOFCS, "802.6 no FCS" }, 58 { PID_RFC2684_BPDU, "BPDU" }, 59 /* the real Ethertypes */ 60 { ETHERTYPE_IP, "IPv4" }, 61 { ETHERTYPE_MPLS, "MPLS unicast" }, 62 { ETHERTYPE_MPLS_MULTI, "MPLS multicast" }, 63 { ETHERTYPE_IPV6, "IPv6" }, 64 { ETHERTYPE_8021Q, "802.1Q" }, 65 { ETHERTYPE_VMAN, "VMAN" }, 66 { ETHERTYPE_PUP, "PUP" }, 67 { ETHERTYPE_ARP, "ARP"}, 68 { ETHERTYPE_REVARP , "Reverse ARP"}, 69 { ETHERTYPE_NS, "NS" }, 70 { ETHERTYPE_SPRITE, "Sprite" }, 71 { ETHERTYPE_TRAIL, "Trail" }, 72 { ETHERTYPE_MOPDL, "MOP DL" }, 73 { ETHERTYPE_MOPRC, "MOP RC" }, 74 { ETHERTYPE_DN, "DN" }, 75 { ETHERTYPE_LAT, "LAT" }, 76 { ETHERTYPE_SCA, "SCA" }, 77 { ETHERTYPE_LANBRIDGE, "Lanbridge" }, 78 { ETHERTYPE_DECDNS, "DEC DNS" }, 79 { ETHERTYPE_DECDTS, "DEC DTS" }, 80 { ETHERTYPE_VEXP, "VEXP" }, 81 { ETHERTYPE_VPROD, "VPROD" }, 82 { ETHERTYPE_ATALK, "Appletalk" }, 83 { ETHERTYPE_AARP, "Appletalk ARP" }, 84 { ETHERTYPE_IPX, "IPX" }, 85 { ETHERTYPE_PPP, "PPP" }, 86 { ETHERTYPE_PPPOED, "PPPoE D" }, 87 { ETHERTYPE_PPPOES, "PPPoE S" }, 88 { ETHERTYPE_EAPOL, "EAPOL" }, 89 { ETHERTYPE_JUMBO, "Jumbo" }, 90 { ETHERTYPE_LOOPBACK, "Loopback" }, 91 { ETHERTYPE_ISO, "OSI" }, 92 { ETHERTYPE_GRE_ISO, "GRE-OSI" }, 93 { 0, NULL} 94 }; 95 96 static inline void 97 ether_hdr_print(register const u_char *bp, u_int length) 98 { 99 register const struct ether_header *ep; 100 ep = (const struct ether_header *)bp; 101 102 (void)printf("%s > %s", 103 etheraddr_string(ESRC(ep)), 104 etheraddr_string(EDST(ep))); 105 106 if (!qflag) { 107 if (ntohs(ep->ether_type) <= ETHERMTU) 108 (void)printf(", 802.3"); 109 else 110 (void)printf(", ethertype %s (0x%04x)", 111 tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)), 112 ntohs(ep->ether_type)); 113 } else { 114 if (ntohs(ep->ether_type) <= ETHERMTU) 115 (void)printf(", 802.3"); 116 else 117 (void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type))); 118 } 119 120 (void)printf(", length %u: ", length); 121 } 122 123 void 124 ether_print(const u_char *p, u_int length, u_int caplen) 125 { 126 struct ether_header *ep; 127 u_short ether_type; 128 u_short extracted_ether_type; 129 130 if (caplen < ETHER_HDRLEN) { 131 printf("[|ether]"); 132 return; 133 } 134 135 if (eflag) 136 ether_hdr_print(p, length); 137 138 length -= ETHER_HDRLEN; 139 caplen -= ETHER_HDRLEN; 140 ep = (struct ether_header *)p; 141 p += ETHER_HDRLEN; 142 143 ether_type = ntohs(ep->ether_type); 144 145 /* 146 * Is it (gag) an 802.3 encapsulation? 147 */ 148 extracted_ether_type = 0; 149 if (ether_type <= ETHERMTU) { 150 /* Try to print the LLC-layer header & higher layers */ 151 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep), 152 &extracted_ether_type) == 0) { 153 /* ether_type not known, print raw packet */ 154 if (!eflag) 155 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 156 157 if (!xflag && !qflag) 158 default_print(p, caplen); 159 } 160 } else if (ether_encap_print(ether_type, p, length, caplen, 161 &extracted_ether_type) == 0) { 162 /* ether_type not known, print raw packet */ 163 if (!eflag) 164 ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN); 165 166 if (!xflag && !qflag) 167 default_print(p, caplen); 168 } 169 } 170 171 /* 172 * This is the top level routine of the printer. 'p' points 173 * to the ether header of the packet, 'h->ts' is the timestamp, 174 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 175 * is the number of bytes actually captured. 176 */ 177 u_int 178 ether_if_print(const struct pcap_pkthdr *h, const u_char *p) 179 { 180 ether_print(p, h->len, h->caplen); 181 182 return (ETHER_HDRLEN); 183 } 184 185 /* 186 * Prints the packet encapsulated in an Ethernet data segment 187 * (or an equivalent encapsulation), given the Ethernet type code. 188 * 189 * Returns non-zero if it can do so, zero if the ethertype is unknown. 190 * 191 * The Ethernet type code is passed through a pointer; if it was 192 * ETHERTYPE_8021Q, it gets updated to be the Ethernet type of 193 * the 802.1Q payload, for the benefit of lower layers that might 194 * want to know what it is. 195 */ 196 197 int 198 ether_encap_print(u_short ether_type, const u_char *p, 199 u_int length, u_int caplen, u_short *extracted_ether_type) 200 { 201 recurse: 202 *extracted_ether_type = ether_type; 203 204 switch (ether_type) { 205 206 case ETHERTYPE_IP: 207 ip_print(gndo, p, length); 208 return (1); 209 210 #ifdef INET6 211 case ETHERTYPE_IPV6: 212 ip6_print(p, length); 213 return (1); 214 #endif /*INET6*/ 215 216 case ETHERTYPE_ARP: 217 case ETHERTYPE_REVARP: 218 arp_print(gndo, p, length, caplen); 219 return (1); 220 221 case ETHERTYPE_DN: 222 decnet_print(p, length, caplen); 223 return (1); 224 225 case ETHERTYPE_ATALK: 226 if (vflag) 227 fputs("et1 ", stdout); 228 atalk_print(p, length); 229 return (1); 230 231 case ETHERTYPE_AARP: 232 aarp_print(p, length); 233 return (1); 234 235 case ETHERTYPE_IPX: 236 printf("(NOV-ETHII) "); 237 ipx_print(p, length); 238 return (1); 239 240 case ETHERTYPE_8021Q: 241 if (eflag) 242 printf("vlan %u, p %u%s, ", 243 ntohs(*(u_int16_t *)p) & 0xfff, 244 ntohs(*(u_int16_t *)p) >> 13, 245 (ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : ""); 246 247 ether_type = ntohs(*(u_int16_t *)(p + 2)); 248 p += 4; 249 length -= 4; 250 caplen -= 4; 251 252 if (ether_type > ETHERMTU) { 253 if (eflag) 254 printf("ethertype %s, ", 255 tok2str(ethertype_values,"0x%04x", ether_type)); 256 goto recurse; 257 } 258 259 *extracted_ether_type = 0; 260 261 if (llc_print(p, length, caplen, p - 18, p - 12, 262 extracted_ether_type) == 0) { 263 ether_hdr_print(p - 18, length + 4); 264 } 265 266 if (!xflag && !qflag) 267 default_print(p - 18, caplen + 4); 268 269 return (1); 270 271 case ETHERTYPE_JUMBO: 272 ether_type = ntohs(*(u_int16_t *)(p)); 273 p += 2; 274 length -= 2; 275 caplen -= 2; 276 277 if (ether_type > ETHERMTU) { 278 if (eflag) 279 printf("ethertype %s, ", 280 tok2str(ethertype_values,"0x%04x", ether_type)); 281 goto recurse; 282 } 283 284 *extracted_ether_type = 0; 285 286 if (llc_print(p, length, caplen, p - 16, p - 10, 287 extracted_ether_type) == 0) { 288 ether_hdr_print(p - 16, length + 2); 289 } 290 291 if (!xflag && !qflag) 292 default_print(p - 16, caplen + 2); 293 294 return (1); 295 296 case ETHERTYPE_ISO: 297 isoclns_print(p+1, length-1, length-1); 298 return(1); 299 300 case ETHERTYPE_PPPOED: 301 case ETHERTYPE_PPPOES: 302 case ETHERTYPE_PPPOED2: 303 case ETHERTYPE_PPPOES2: 304 pppoe_print(p, length); 305 return (1); 306 307 case ETHERTYPE_EAPOL: 308 eap_print(gndo, p, length); 309 return (1); 310 311 case ETHERTYPE_PPP: 312 if (length) { 313 printf(": "); 314 ppp_print(p, length); 315 } 316 return (1); 317 318 case ETHERTYPE_LOOPBACK: 319 return (0); 320 321 case ETHERTYPE_MPLS: 322 case ETHERTYPE_MPLS_MULTI: 323 mpls_print(p, length); 324 return (1); 325 326 case ETHERTYPE_LAT: 327 case ETHERTYPE_SCA: 328 case ETHERTYPE_MOPRC: 329 case ETHERTYPE_MOPDL: 330 /* default_print for now */ 331 default: 332 return (0); 333 } 334 } 335 336 337 /* 338 * Local Variables: 339 * c-style: whitesmith 340 * c-basic-offset: 8 341 * End: 342 */ 343 344