1 /* 2 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997 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 22 #ifndef lint 23 static const char rcsid[] _U_ = 24 "@(#) $Header: /tcpdump/master/tcpdump/print-fddi.c,v 1.66 2005-11-13 12:12:41 guy Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <tcpdump-stdinc.h> 32 33 #include <pcap.h> 34 #include <stdio.h> 35 #include <string.h> 36 37 #include "interface.h" 38 #include "addrtoname.h" 39 #include "ethertype.h" 40 41 #include "ether.h" 42 #include "fddi.h" 43 44 /* 45 * Some FDDI interfaces use bit-swapped addresses. 46 */ 47 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__) 48 int fddi_bitswap = 0; 49 #else 50 int fddi_bitswap = 1; 51 #endif 52 53 /* 54 * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992 55 * 56 * Based in part on code by Van Jacobson, which bears this note: 57 * 58 * NOTE: This is a very preliminary hack for FDDI support. 59 * There are all sorts of wired in constants & nothing (yet) 60 * to print SMT packets as anything other than hex dumps. 61 * Most of the necessary changes are waiting on my redoing 62 * the "header" that a kernel fddi driver supplies to bpf: I 63 * want it to look like one byte of 'direction' (0 or 1 64 * depending on whether the packet was inbound or outbound), 65 * two bytes of system/driver dependent data (anything an 66 * implementor thinks would be useful to filter on and/or 67 * save per-packet, then the real 21-byte FDDI header. 68 * Steve McCanne & I have also talked about adding the 69 * 'direction' byte to all bpf headers (e.g., in the two 70 * bytes of padding on an ethernet header). It's not clear 71 * we could do this in a backwards compatible way & we hate 72 * the idea of an incompatible bpf change. Discussions are 73 * proceeding. 74 * 75 * Also, to really support FDDI (and better support 802.2 76 * over ethernet) we really need to re-think the rather simple 77 * minded assumptions about fixed length & fixed format link 78 * level headers made in gencode.c. One day... 79 * 80 * - vj 81 */ 82 83 static u_char fddi_bit_swap[] = { 84 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 85 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 86 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 87 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 88 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 89 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 90 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 91 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 92 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 93 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 94 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 95 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 96 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 97 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 98 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 99 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 100 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 101 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 102 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 103 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 104 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 105 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 106 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 107 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 108 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 109 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 110 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 111 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 112 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 113 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 114 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 115 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, 116 }; 117 118 /* 119 * Print FDDI frame-control bits 120 */ 121 static inline void 122 print_fddi_fc(u_char fc) 123 { 124 switch (fc) { 125 126 case FDDIFC_VOID: /* Void frame */ 127 printf("void "); 128 break; 129 130 case FDDIFC_NRT: /* Nonrestricted token */ 131 printf("nrt "); 132 break; 133 134 case FDDIFC_RT: /* Restricted token */ 135 printf("rt "); 136 break; 137 138 case FDDIFC_SMT_INFO: /* SMT Info */ 139 printf("info "); 140 break; 141 142 case FDDIFC_SMT_NSA: /* SMT Next station adrs */ 143 printf("nsa "); 144 break; 145 146 case FDDIFC_MAC_BEACON: /* MAC Beacon frame */ 147 printf("beacon "); 148 break; 149 150 case FDDIFC_MAC_CLAIM: /* MAC Claim frame */ 151 printf("claim "); 152 break; 153 154 default: 155 switch (fc & FDDIFC_CLFF) { 156 157 case FDDIFC_MAC: 158 printf("mac%1x ", fc & FDDIFC_ZZZZ); 159 break; 160 161 case FDDIFC_SMT: 162 printf("smt%1x ", fc & FDDIFC_ZZZZ); 163 break; 164 165 case FDDIFC_LLC_ASYNC: 166 printf("async%1x ", fc & FDDIFC_ZZZZ); 167 break; 168 169 case FDDIFC_LLC_SYNC: 170 printf("sync%1x ", fc & FDDIFC_ZZZZ); 171 break; 172 173 case FDDIFC_IMP_ASYNC: 174 printf("imp_async%1x ", fc & FDDIFC_ZZZZ); 175 break; 176 177 case FDDIFC_IMP_SYNC: 178 printf("imp_sync%1x ", fc & FDDIFC_ZZZZ); 179 break; 180 181 default: 182 printf("%02x ", fc); 183 break; 184 } 185 } 186 } 187 188 /* Extract src, dst addresses */ 189 static inline void 190 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst) 191 { 192 register int i; 193 194 if (fddi_bitswap) { 195 /* 196 * bit-swap the fddi addresses (isn't the IEEE standards 197 * process wonderful!) then convert them to names. 198 */ 199 for (i = 0; i < 6; ++i) 200 fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]]; 201 for (i = 0; i < 6; ++i) 202 fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]]; 203 } 204 else { 205 memcpy(fdst, (const char *)fddip->fddi_dhost, 6); 206 memcpy(fsrc, (const char *)fddip->fddi_shost, 6); 207 } 208 } 209 210 /* 211 * Print the FDDI MAC header 212 */ 213 static inline void 214 fddi_hdr_print(register const struct fddi_header *fddip, register u_int length, 215 register const u_char *fsrc, register const u_char *fdst) 216 { 217 const char *srcname, *dstname; 218 219 srcname = etheraddr_string(fsrc); 220 dstname = etheraddr_string(fdst); 221 222 if (vflag) 223 (void) printf("%02x %s %s %d: ", 224 fddip->fddi_fc, 225 srcname, dstname, 226 length); 227 else if (qflag) 228 printf("%s %s %d: ", srcname, dstname, length); 229 else { 230 (void) print_fddi_fc(fddip->fddi_fc); 231 (void) printf("%s %s %d: ", srcname, dstname, length); 232 } 233 } 234 235 static inline void 236 fddi_smt_print(const u_char *p _U_, u_int length _U_) 237 { 238 printf("<SMT printer not yet implemented>"); 239 } 240 241 void 242 fddi_print(const u_char *p, u_int length, u_int caplen) 243 { 244 const struct fddi_header *fddip = (const struct fddi_header *)p; 245 struct ether_header ehdr; 246 u_short extracted_ethertype; 247 248 if (caplen < FDDI_HDRLEN) { 249 printf("[|fddi]"); 250 return; 251 } 252 253 /* 254 * Get the FDDI addresses into a canonical form 255 */ 256 extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 257 258 if (eflag) 259 fddi_hdr_print(fddip, length, ESRC(&ehdr), EDST(&ehdr)); 260 261 /* Skip over FDDI MAC header */ 262 length -= FDDI_HDRLEN; 263 p += FDDI_HDRLEN; 264 caplen -= FDDI_HDRLEN; 265 266 /* Frame Control field determines interpretation of packet */ 267 if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) { 268 /* Try to print the LLC-layer header & higher layers */ 269 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 270 &extracted_ethertype) == 0) { 271 /* 272 * Some kinds of LLC packet we cannot 273 * handle intelligently 274 */ 275 if (!eflag) 276 fddi_hdr_print(fddip, length + FDDI_HDRLEN, 277 ESRC(&ehdr), EDST(&ehdr)); 278 if (extracted_ethertype) { 279 printf("(LLC %s) ", 280 etherproto_string(htons(extracted_ethertype))); 281 } 282 if (!suppress_default_print) 283 default_print(p, caplen); 284 } 285 } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT) 286 fddi_smt_print(p, caplen); 287 else { 288 /* Some kinds of FDDI packet we cannot handle intelligently */ 289 if (!eflag) 290 fddi_hdr_print(fddip, length + FDDI_HDRLEN, ESRC(&ehdr), 291 EDST(&ehdr)); 292 if (!suppress_default_print) 293 default_print(p, caplen); 294 } 295 } 296 297 /* 298 * This is the top level routine of the printer. 'p' points 299 * to the FDDI header of the packet, 'h->ts' is the timestamp, 300 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 301 * is the number of bytes actually captured. 302 */ 303 u_int 304 fddi_if_print(const struct pcap_pkthdr *h, register const u_char *p) 305 { 306 fddi_print(p, h->len, h->caplen); 307 308 return (FDDI_HDRLEN); 309 } 310
