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 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-fddi.c,v 1.6 2017/02/05 04:05:05 spz Exp $"); 25 #endif 26 27 /* \summary: Fiber Distributed Data Interface (FDDI) printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include <string.h> 36 37 #include "netdissect.h" 38 #include "addrtoname.h" 39 #include "ether.h" 40 41 /* 42 * Based on Ultrix if_fddi.h 43 */ 44 45 struct fddi_header { 46 u_char fddi_fc; /* frame control */ 47 u_char fddi_dhost[6]; 48 u_char fddi_shost[6]; 49 }; 50 51 /* 52 * Length of an FDDI header; note that some compilers may pad 53 * "struct fddi_header" to a multiple of 4 bytes, for example, so 54 * "sizeof (struct fddi_header)" may not give the right 55 * answer. 56 */ 57 #define FDDI_HDRLEN 13 58 59 /* Useful values for fddi_fc (frame control) field */ 60 61 /* 62 * FDDI Frame Control bits 63 */ 64 #define FDDIFC_C 0x80 /* Class bit */ 65 #define FDDIFC_L 0x40 /* Address length bit */ 66 #define FDDIFC_F 0x30 /* Frame format bits */ 67 #define FDDIFC_Z 0x0f /* Control bits */ 68 69 /* 70 * FDDI Frame Control values. (48-bit addressing only). 71 */ 72 #define FDDIFC_VOID 0x40 /* Void frame */ 73 #define FDDIFC_NRT 0x80 /* Nonrestricted token */ 74 #define FDDIFC_RT 0xc0 /* Restricted token */ 75 #define FDDIFC_SMT_INFO 0x41 /* SMT Info */ 76 #define FDDIFC_SMT_NSA 0x4F /* SMT Next station adrs */ 77 #define FDDIFC_MAC_BEACON 0xc2 /* MAC Beacon frame */ 78 #define FDDIFC_MAC_CLAIM 0xc3 /* MAC Claim frame */ 79 #define FDDIFC_LLC_ASYNC 0x50 /* Async. LLC frame */ 80 #define FDDIFC_LLC_SYNC 0xd0 /* Sync. LLC frame */ 81 #define FDDIFC_IMP_ASYNC 0x60 /* Implementor Async. */ 82 #define FDDIFC_IMP_SYNC 0xe0 /* Implementor Synch. */ 83 #define FDDIFC_SMT 0x40 /* SMT frame */ 84 #define FDDIFC_MAC 0xc0 /* MAC frame */ 85 86 #define FDDIFC_CLFF 0xF0 /* Class/Length/Format bits */ 87 #define FDDIFC_ZZZZ 0x0F /* Control bits */ 88 89 /* 90 * Some FDDI interfaces use bit-swapped addresses. 91 */ 92 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__) 93 static int fddi_bitswap = 0; 94 #else 95 static int fddi_bitswap = 1; 96 #endif 97 98 /* 99 * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992 100 * 101 * Based in part on code by Van Jacobson, which bears this note: 102 * 103 * NOTE: This is a very preliminary hack for FDDI support. 104 * There are all sorts of wired in constants & nothing (yet) 105 * to print SMT packets as anything other than hex dumps. 106 * Most of the necessary changes are waiting on my redoing 107 * the "header" that a kernel fddi driver supplies to bpf: I 108 * want it to look like one byte of 'direction' (0 or 1 109 * depending on whether the packet was inbound or outbound), 110 * two bytes of system/driver dependent data (anything an 111 * implementor thinks would be useful to filter on and/or 112 * save per-packet, then the real 21-byte FDDI header. 113 * Steve McCanne & I have also talked about adding the 114 * 'direction' byte to all bpf headers (e.g., in the two 115 * bytes of padding on an ethernet header). It's not clear 116 * we could do this in a backwards compatible way & we hate 117 * the idea of an incompatible bpf change. Discussions are 118 * proceeding. 119 * 120 * Also, to really support FDDI (and better support 802.2 121 * over ethernet) we really need to re-think the rather simple 122 * minded assumptions about fixed length & fixed format link 123 * level headers made in gencode.c. One day... 124 * 125 * - vj 126 */ 127 128 static const u_char fddi_bit_swap[] = { 129 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 130 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 131 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 132 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 133 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 134 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 135 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 136 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 137 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 138 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 139 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 140 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 141 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 142 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 143 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 144 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 145 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 146 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 147 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 148 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 149 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 150 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 151 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 152 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 153 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 154 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 155 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 156 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 157 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 158 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 159 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 160 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, 161 }; 162 163 /* 164 * Print FDDI frame-control bits 165 */ 166 static inline void 167 print_fddi_fc(netdissect_options *ndo, u_char fc) 168 { 169 switch (fc) { 170 171 case FDDIFC_VOID: /* Void frame */ 172 ND_PRINT((ndo, "void ")); 173 break; 174 175 case FDDIFC_NRT: /* Nonrestricted token */ 176 ND_PRINT((ndo, "nrt ")); 177 break; 178 179 case FDDIFC_RT: /* Restricted token */ 180 ND_PRINT((ndo, "rt ")); 181 break; 182 183 case FDDIFC_SMT_INFO: /* SMT Info */ 184 ND_PRINT((ndo, "info ")); 185 break; 186 187 case FDDIFC_SMT_NSA: /* SMT Next station adrs */ 188 ND_PRINT((ndo, "nsa ")); 189 break; 190 191 case FDDIFC_MAC_BEACON: /* MAC Beacon frame */ 192 ND_PRINT((ndo, "beacon ")); 193 break; 194 195 case FDDIFC_MAC_CLAIM: /* MAC Claim frame */ 196 ND_PRINT((ndo, "claim ")); 197 break; 198 199 default: 200 switch (fc & FDDIFC_CLFF) { 201 202 case FDDIFC_MAC: 203 ND_PRINT((ndo, "mac%1x ", fc & FDDIFC_ZZZZ)); 204 break; 205 206 case FDDIFC_SMT: 207 ND_PRINT((ndo, "smt%1x ", fc & FDDIFC_ZZZZ)); 208 break; 209 210 case FDDIFC_LLC_ASYNC: 211 ND_PRINT((ndo, "async%1x ", fc & FDDIFC_ZZZZ)); 212 break; 213 214 case FDDIFC_LLC_SYNC: 215 ND_PRINT((ndo, "sync%1x ", fc & FDDIFC_ZZZZ)); 216 break; 217 218 case FDDIFC_IMP_ASYNC: 219 ND_PRINT((ndo, "imp_async%1x ", fc & FDDIFC_ZZZZ)); 220 break; 221 222 case FDDIFC_IMP_SYNC: 223 ND_PRINT((ndo, "imp_sync%1x ", fc & FDDIFC_ZZZZ)); 224 break; 225 226 default: 227 ND_PRINT((ndo, "%02x ", fc)); 228 break; 229 } 230 } 231 } 232 233 /* Extract src, dst addresses */ 234 static inline void 235 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst) 236 { 237 register int i; 238 239 if (fddi_bitswap) { 240 /* 241 * bit-swap the fddi addresses (isn't the IEEE standards 242 * process wonderful!) then convert them to names. 243 */ 244 for (i = 0; i < 6; ++i) 245 fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]]; 246 for (i = 0; i < 6; ++i) 247 fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]]; 248 } 249 else { 250 memcpy(fdst, (const char *)fddip->fddi_dhost, 6); 251 memcpy(fsrc, (const char *)fddip->fddi_shost, 6); 252 } 253 } 254 255 /* 256 * Print the FDDI MAC header 257 */ 258 static inline void 259 fddi_hdr_print(netdissect_options *ndo, 260 register const struct fddi_header *fddip, register u_int length, 261 register const u_char *fsrc, register const u_char *fdst) 262 { 263 const char *srcname, *dstname; 264 265 srcname = etheraddr_string(ndo, fsrc); 266 dstname = etheraddr_string(ndo, fdst); 267 268 if (!ndo->ndo_qflag) 269 print_fddi_fc(ndo, fddip->fddi_fc); 270 ND_PRINT((ndo, "%s > %s, length %u: ", 271 srcname, dstname, 272 length)); 273 } 274 275 static inline void 276 fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_) 277 { 278 ND_PRINT((ndo, "<SMT printer not yet implemented>")); 279 } 280 281 u_int 282 fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 283 { 284 const struct fddi_header *fddip = (const struct fddi_header *)p; 285 struct ether_header ehdr; 286 struct lladdr_info src, dst; 287 int llc_hdrlen; 288 289 if (caplen < FDDI_HDRLEN) { 290 ND_PRINT((ndo, "[|fddi]")); 291 return (caplen); 292 } 293 294 /* 295 * Get the FDDI addresses into a canonical form 296 */ 297 extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 298 299 if (ndo->ndo_eflag) 300 fddi_hdr_print(ndo, fddip, length, ESRC(&ehdr), EDST(&ehdr)); 301 302 src.addr = ESRC(&ehdr); 303 src.addr_string = etheraddr_string; 304 dst.addr = EDST(&ehdr); 305 dst.addr_string = etheraddr_string; 306 307 /* Skip over FDDI MAC header */ 308 length -= FDDI_HDRLEN; 309 p += FDDI_HDRLEN; 310 caplen -= FDDI_HDRLEN; 311 312 /* Frame Control field determines interpretation of packet */ 313 if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) { 314 /* Try to print the LLC-layer header & higher layers */ 315 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 316 if (llc_hdrlen < 0) { 317 /* 318 * Some kinds of LLC packet we cannot 319 * handle intelligently 320 */ 321 if (!ndo->ndo_suppress_default_print) 322 ND_DEFAULTPRINT(p, caplen); 323 llc_hdrlen = -llc_hdrlen; 324 } 325 } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT) { 326 fddi_smt_print(ndo, p, caplen); 327 llc_hdrlen = 0; 328 } else { 329 /* Some kinds of FDDI packet we cannot handle intelligently */ 330 if (!ndo->ndo_eflag) 331 fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN, ESRC(&ehdr), 332 EDST(&ehdr)); 333 if (!ndo->ndo_suppress_default_print) 334 ND_DEFAULTPRINT(p, caplen); 335 llc_hdrlen = 0; 336 } 337 return (FDDI_HDRLEN + llc_hdrlen); 338 } 339 340 /* 341 * This is the top level routine of the printer. 'p' points 342 * to the FDDI header of the packet, 'h->ts' is the timestamp, 343 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 344 * is the number of bytes actually captured. 345 */ 346 u_int 347 fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) 348 { 349 return (fddi_print(ndo, p, h->len, h->caplen)); 350 } 351