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[] = 24 "@(#) $Header: print-fddi.c,v 1.36 97/05/26 17:13:35 leres Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_FDDI 28 #include <sys/param.h> 29 #include <sys/time.h> 30 #include <sys/socket.h> 31 #include <sys/file.h> 32 #include <sys/ioctl.h> 33 34 #if __STDC__ 35 struct mbuf; 36 struct rtentry; 37 #endif 38 #include <net/if.h> 39 40 #include <netinet/in.h> 41 #include <net/ethernet.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/ip.h> 44 45 #include <ctype.h> 46 #include <netdb.h> 47 #include <pcap.h> 48 #include <stdio.h> 49 #include <string.h> 50 51 #include "interface.h" 52 #include "addrtoname.h" 53 #include "ethertype.h" 54 55 #include "fddi.h" 56 57 /* 58 * Some FDDI interfaces use bit-swapped addresses. 59 */ 60 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) 61 int fddi_bitswap = 0; 62 #else 63 int fddi_bitswap = 1; 64 #endif 65 66 /* 67 * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992 68 * 69 * Based in part on code by Van Jacobson, which bears this note: 70 * 71 * NOTE: This is a very preliminary hack for FDDI support. 72 * There are all sorts of wired in constants & nothing (yet) 73 * to print SMT packets as anything other than hex dumps. 74 * Most of the necessary changes are waiting on my redoing 75 * the "header" that a kernel fddi driver supplies to bpf: I 76 * want it to look like one byte of 'direction' (0 or 1 77 * depending on whether the packet was inbound or outbound), 78 * two bytes of system/driver dependent data (anything an 79 * implementor thinks would be useful to filter on and/or 80 * save per-packet, then the real 21-byte FDDI header. 81 * Steve McCanne & I have also talked about adding the 82 * 'direction' byte to all bpf headers (e.g., in the two 83 * bytes of padding on an ethernet header). It's not clear 84 * we could do this in a backwards compatible way & we hate 85 * the idea of an incompatible bpf change. Discussions are 86 * proceeding. 87 * 88 * Also, to really support FDDI (and better support 802.2 89 * over ethernet) we really need to re-think the rather simple 90 * minded assumptions about fixed length & fixed format link 91 * level headers made in gencode.c. One day... 92 * 93 * - vj 94 */ 95 96 #define FDDI_HDRLEN (sizeof(struct fddi_header)) 97 98 static u_char fddi_bit_swap[] = { 99 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 100 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 101 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 102 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 103 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 104 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 105 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 106 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 107 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 108 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 109 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 110 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 111 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 112 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 113 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 114 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 115 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 116 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 117 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 118 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 119 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 120 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 121 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 122 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 123 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 124 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 125 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 126 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 127 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 128 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 129 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 130 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, 131 }; 132 133 /* 134 * Print FDDI frame-control bits 135 */ 136 static inline void 137 print_fddi_fc(u_char fc) 138 { 139 switch (fc) { 140 141 case FDDIFC_VOID: /* Void frame */ 142 printf("void "); 143 break; 144 145 case FDDIFC_NRT: /* Nonrestricted token */ 146 printf("nrt "); 147 break; 148 149 case FDDIFC_RT: /* Restricted token */ 150 printf("rt "); 151 break; 152 153 case FDDIFC_SMT_INFO: /* SMT Info */ 154 printf("info "); 155 break; 156 157 case FDDIFC_SMT_NSA: /* SMT Next station adrs */ 158 printf("nsa "); 159 break; 160 161 case FDDIFC_MAC_BEACON: /* MAC Beacon frame */ 162 printf("beacon "); 163 break; 164 165 case FDDIFC_MAC_CLAIM: /* MAC Claim frame */ 166 printf("claim "); 167 break; 168 169 default: 170 switch (fc & FDDIFC_CLFF) { 171 172 case FDDIFC_MAC: 173 printf("mac%1x ", fc & FDDIFC_ZZZZ); 174 break; 175 176 case FDDIFC_SMT: 177 printf("smt%1x ", fc & FDDIFC_ZZZZ); 178 break; 179 180 case FDDIFC_LLC_ASYNC: 181 printf("async%1x ", fc & FDDIFC_ZZZZ); 182 break; 183 184 case FDDIFC_LLC_SYNC: 185 printf("sync%1x ", fc & FDDIFC_ZZZZ); 186 break; 187 188 case FDDIFC_IMP_ASYNC: 189 printf("imp_async%1x ", fc & FDDIFC_ZZZZ); 190 break; 191 192 case FDDIFC_IMP_SYNC: 193 printf("imp_sync%1x ", fc & FDDIFC_ZZZZ); 194 break; 195 196 default: 197 printf("%02x ", fc); 198 break; 199 } 200 } 201 } 202 203 /* Extract src, dst addresses */ 204 static inline void 205 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst) 206 { 207 register int i; 208 209 if (fddi_bitswap) { 210 /* 211 * bit-swap the fddi addresses (isn't the IEEE standards 212 * process wonderful!) then convert them to names. 213 */ 214 for (i = 0; i < 6; ++i) 215 fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]]; 216 for (i = 0; i < 6; ++i) 217 fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]]; 218 } 219 else { 220 memcpy(fdst, (char *)fddip->fddi_dhost, 6); 221 memcpy(fsrc, (char *)fddip->fddi_shost, 6); 222 } 223 } 224 225 /* 226 * Print the FDDI MAC header 227 */ 228 static inline void 229 fddi_print(register const struct fddi_header *fddip, register u_int length, 230 register const u_char *fsrc, register const u_char *fdst) 231 { 232 char *srcname, *dstname; 233 234 srcname = etheraddr_string(fsrc); 235 dstname = etheraddr_string(fdst); 236 237 if (vflag) 238 (void) printf("%02x %s %s %d: ", 239 fddip->fddi_fc, 240 srcname, dstname, 241 length); 242 else if (qflag) 243 printf("%s %s %d: ", srcname, dstname, length); 244 else { 245 (void) print_fddi_fc(fddip->fddi_fc); 246 (void) printf("%s %s %d: ", srcname, dstname, length); 247 } 248 } 249 250 static inline void 251 fddi_smt_print(const u_char *p, u_int length) 252 { 253 printf("<SMT printer not yet implemented>"); 254 } 255 256 /* 257 * This is the top level routine of the printer. 'sp' is the points 258 * to the FDDI header of the packet, 'tvp' is the timestamp, 259 * 'length' is the length of the packet off the wire, and 'caplen' 260 * is the number of bytes actually captured. 261 */ 262 void 263 fddi_if_print(u_char *pcap, const struct pcap_pkthdr *h, 264 register const u_char *p) 265 { 266 u_int caplen = h->caplen; 267 u_int length = h->len; 268 const struct fddi_header *fddip = (struct fddi_header *)p; 269 extern u_short extracted_ethertype; 270 struct ether_header ehdr; 271 272 ts_print(&h->ts); 273 274 if (caplen < FDDI_HDRLEN) { 275 printf("[|fddi]"); 276 goto out; 277 } 278 /* 279 * Get the FDDI addresses into a canonical form 280 */ 281 extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); 282 /* 283 * Some printers want to get back at the link level addresses, 284 * and/or check that they're not walking off the end of the packet. 285 * Rather than pass them all the way down, we set these globals. 286 */ 287 snapend = p + caplen; 288 /* 289 * Actually, the only printer that uses packetp is print-bootp.c, 290 * and it assumes that packetp points to an Ethernet header. The 291 * right thing to do is to fix print-bootp.c to know which link 292 * type is in use when it excavates. XXX 293 */ 294 packetp = (u_char *)&ehdr; 295 296 if (eflag) 297 fddi_print(fddip, length, ESRC(&ehdr), EDST(&ehdr)); 298 299 /* Skip over FDDI MAC header */ 300 length -= FDDI_HDRLEN; 301 p += FDDI_HDRLEN; 302 caplen -= FDDI_HDRLEN; 303 304 /* Frame Control field determines interpretation of packet */ 305 extracted_ethertype = 0; 306 if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) { 307 /* Try to print the LLC-layer header & higher layers */ 308 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr)) 309 == 0) { 310 /* 311 * Some kinds of LLC packet we cannot 312 * handle intelligently 313 */ 314 if (!eflag) 315 fddi_print(fddip, length, 316 ESRC(&ehdr), EDST(&ehdr)); 317 if (extracted_ethertype) { 318 printf("(LLC %s) ", 319 etherproto_string(htons(extracted_ethertype))); 320 } 321 if (!xflag && !qflag) 322 default_print(p, caplen); 323 } 324 } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT) 325 fddi_smt_print(p, caplen); 326 else { 327 /* Some kinds of FDDI packet we cannot handle intelligently */ 328 if (!eflag) 329 fddi_print(fddip, length, ESRC(&ehdr), EDST(&ehdr)); 330 if (!xflag && !qflag) 331 default_print(p, caplen); 332 } 333 if (xflag) 334 default_print(p, caplen); 335 out: 336 putchar('\n'); 337 } 338 #else 339 #include <sys/types.h> 340 #include <sys/time.h> 341 342 #include <stdio.h> 343 344 #include "interface.h" 345 void 346 fddi_if_print(u_char *pcap, const struct pcap_pkthdr *h, 347 register const u_char *p) 348 { 349 350 error("not configured for fddi"); 351 /* NOTREACHED */ 352 } 353 #endif 354