| /* |
| * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* \summary: Fiber Distributed Data Interface (FDDI) printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <netdissect-stdinc.h> |
| |
| #include <string.h> |
| |
| #include "netdissect.h" |
| #include "addrtoname.h" |
| #include "ether.h" |
| |
| /* |
| * Based on Ultrix if_fddi.h |
| */ |
| |
| struct fddi_header { |
| u_char fddi_fc; /* frame control */ |
| u_char fddi_dhost[6]; |
| u_char fddi_shost[6]; |
| }; |
| |
| /* |
| * Length of an FDDI header; note that some compilers may pad |
| * "struct fddi_header" to a multiple of 4 bytes, for example, so |
| * "sizeof (struct fddi_header)" may not give the right |
| * answer. |
| */ |
| #define FDDI_HDRLEN 13 |
| |
| /* Useful values for fddi_fc (frame control) field */ |
| |
| /* |
| * FDDI Frame Control bits |
| */ |
| #define FDDIFC_C 0x80 /* Class bit */ |
| #define FDDIFC_L 0x40 /* Address length bit */ |
| #define FDDIFC_F 0x30 /* Frame format bits */ |
| #define FDDIFC_Z 0x0f /* Control bits */ |
| |
| /* |
| * FDDI Frame Control values. (48-bit addressing only). |
| */ |
| #define FDDIFC_VOID 0x40 /* Void frame */ |
| #define FDDIFC_NRT 0x80 /* Nonrestricted token */ |
| #define FDDIFC_RT 0xc0 /* Restricted token */ |
| #define FDDIFC_SMT_INFO 0x41 /* SMT Info */ |
| #define FDDIFC_SMT_NSA 0x4F /* SMT Next station adrs */ |
| #define FDDIFC_MAC_BEACON 0xc2 /* MAC Beacon frame */ |
| #define FDDIFC_MAC_CLAIM 0xc3 /* MAC Claim frame */ |
| #define FDDIFC_LLC_ASYNC 0x50 /* Async. LLC frame */ |
| #define FDDIFC_LLC_SYNC 0xd0 /* Sync. LLC frame */ |
| #define FDDIFC_IMP_ASYNC 0x60 /* Implementor Async. */ |
| #define FDDIFC_IMP_SYNC 0xe0 /* Implementor Synch. */ |
| #define FDDIFC_SMT 0x40 /* SMT frame */ |
| #define FDDIFC_MAC 0xc0 /* MAC frame */ |
| |
| #define FDDIFC_CLFF 0xF0 /* Class/Length/Format bits */ |
| #define FDDIFC_ZZZZ 0x0F /* Control bits */ |
| |
| /* |
| * Some FDDI interfaces use bit-swapped addresses. |
| */ |
| #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__) |
| static int fddi_bitswap = 0; |
| #else |
| static int fddi_bitswap = 1; |
| #endif |
| |
| /* |
| * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992 |
| * |
| * Based in part on code by Van Jacobson, which bears this note: |
| * |
| * NOTE: This is a very preliminary hack for FDDI support. |
| * There are all sorts of wired in constants & nothing (yet) |
| * to print SMT packets as anything other than hex dumps. |
| * Most of the necessary changes are waiting on my redoing |
| * the "header" that a kernel fddi driver supplies to bpf: I |
| * want it to look like one byte of 'direction' (0 or 1 |
| * depending on whether the packet was inbound or outbound), |
| * two bytes of system/driver dependent data (anything an |
| * implementor thinks would be useful to filter on and/or |
| * save per-packet, then the real 21-byte FDDI header. |
| * Steve McCanne & I have also talked about adding the |
| * 'direction' byte to all bpf headers (e.g., in the two |
| * bytes of padding on an ethernet header). It's not clear |
| * we could do this in a backwards compatible way & we hate |
| * the idea of an incompatible bpf change. Discussions are |
| * proceeding. |
| * |
| * Also, to really support FDDI (and better support 802.2 |
| * over ethernet) we really need to re-think the rather simple |
| * minded assumptions about fixed length & fixed format link |
| * level headers made in gencode.c. One day... |
| * |
| * - vj |
| */ |
| |
| static const u_char fddi_bit_swap[] = { |
| 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, |
| 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, |
| 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, |
| 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, |
| 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, |
| 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, |
| 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, |
| 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, |
| 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, |
| 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, |
| 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, |
| 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, |
| 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, |
| 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, |
| 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, |
| 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, |
| 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, |
| 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, |
| 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, |
| 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, |
| 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, |
| 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, |
| 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, |
| 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, |
| 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, |
| 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, |
| 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, |
| 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, |
| 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, |
| 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, |
| 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, |
| 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, |
| }; |
| |
| /* |
| * Print FDDI frame-control bits |
| */ |
| static inline void |
| print_fddi_fc(netdissect_options *ndo, u_char fc) |
| { |
| switch (fc) { |
| |
| case FDDIFC_VOID: /* Void frame */ |
| ND_PRINT((ndo, "void ")); |
| break; |
| |
| case FDDIFC_NRT: /* Nonrestricted token */ |
| ND_PRINT((ndo, "nrt ")); |
| break; |
| |
| case FDDIFC_RT: /* Restricted token */ |
| ND_PRINT((ndo, "rt ")); |
| break; |
| |
| case FDDIFC_SMT_INFO: /* SMT Info */ |
| ND_PRINT((ndo, "info ")); |
| break; |
| |
| case FDDIFC_SMT_NSA: /* SMT Next station adrs */ |
| ND_PRINT((ndo, "nsa ")); |
| break; |
| |
| case FDDIFC_MAC_BEACON: /* MAC Beacon frame */ |
| ND_PRINT((ndo, "beacon ")); |
| break; |
| |
| case FDDIFC_MAC_CLAIM: /* MAC Claim frame */ |
| ND_PRINT((ndo, "claim ")); |
| break; |
| |
| default: |
| switch (fc & FDDIFC_CLFF) { |
| |
| case FDDIFC_MAC: |
| ND_PRINT((ndo, "mac%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| case FDDIFC_SMT: |
| ND_PRINT((ndo, "smt%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| case FDDIFC_LLC_ASYNC: |
| ND_PRINT((ndo, "async%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| case FDDIFC_LLC_SYNC: |
| ND_PRINT((ndo, "sync%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| case FDDIFC_IMP_ASYNC: |
| ND_PRINT((ndo, "imp_async%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| case FDDIFC_IMP_SYNC: |
| ND_PRINT((ndo, "imp_sync%1x ", fc & FDDIFC_ZZZZ)); |
| break; |
| |
| default: |
| ND_PRINT((ndo, "%02x ", fc)); |
| break; |
| } |
| } |
| } |
| |
| /* Extract src, dst addresses */ |
| static inline void |
| extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst) |
| { |
| register int i; |
| |
| if (fddi_bitswap) { |
| /* |
| * bit-swap the fddi addresses (isn't the IEEE standards |
| * process wonderful!) then convert them to names. |
| */ |
| for (i = 0; i < 6; ++i) |
| fdst[i] = fddi_bit_swap[fddip->fddi_dhost[i]]; |
| for (i = 0; i < 6; ++i) |
| fsrc[i] = fddi_bit_swap[fddip->fddi_shost[i]]; |
| } |
| else { |
| memcpy(fdst, (const char *)fddip->fddi_dhost, 6); |
| memcpy(fsrc, (const char *)fddip->fddi_shost, 6); |
| } |
| } |
| |
| /* |
| * Print the FDDI MAC header |
| */ |
| static inline void |
| fddi_hdr_print(netdissect_options *ndo, |
| register const struct fddi_header *fddip, register u_int length, |
| register const u_char *fsrc, register const u_char *fdst) |
| { |
| const char *srcname, *dstname; |
| |
| srcname = etheraddr_string(ndo, fsrc); |
| dstname = etheraddr_string(ndo, fdst); |
| |
| if (!ndo->ndo_qflag) |
| print_fddi_fc(ndo, fddip->fddi_fc); |
| ND_PRINT((ndo, "%s > %s, length %u: ", |
| srcname, dstname, |
| length)); |
| } |
| |
| static inline void |
| fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_) |
| { |
| ND_PRINT((ndo, "<SMT printer not yet implemented>")); |
| } |
| |
| u_int |
| fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) |
| { |
| const struct fddi_header *fddip = (const struct fddi_header *)p; |
| struct ether_header ehdr; |
| struct lladdr_info src, dst; |
| int llc_hdrlen; |
| |
| if (caplen < FDDI_HDRLEN) { |
| ND_PRINT((ndo, "[|fddi]")); |
| return (caplen); |
| } |
| |
| /* |
| * Get the FDDI addresses into a canonical form |
| */ |
| extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr)); |
| |
| if (ndo->ndo_eflag) |
| fddi_hdr_print(ndo, fddip, length, ESRC(&ehdr), EDST(&ehdr)); |
| |
| src.addr = ESRC(&ehdr); |
| src.addr_string = etheraddr_string; |
| dst.addr = EDST(&ehdr); |
| dst.addr_string = etheraddr_string; |
| |
| /* Skip over FDDI MAC header */ |
| length -= FDDI_HDRLEN; |
| p += FDDI_HDRLEN; |
| caplen -= FDDI_HDRLEN; |
| |
| /* Frame Control field determines interpretation of packet */ |
| if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) { |
| /* Try to print the LLC-layer header & higher layers */ |
| llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); |
| if (llc_hdrlen < 0) { |
| /* |
| * Some kinds of LLC packet we cannot |
| * handle intelligently |
| */ |
| if (!ndo->ndo_suppress_default_print) |
| ND_DEFAULTPRINT(p, caplen); |
| llc_hdrlen = -llc_hdrlen; |
| } |
| } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT) { |
| fddi_smt_print(ndo, p, caplen); |
| llc_hdrlen = 0; |
| } else { |
| /* Some kinds of FDDI packet we cannot handle intelligently */ |
| if (!ndo->ndo_eflag) |
| fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN, ESRC(&ehdr), |
| EDST(&ehdr)); |
| if (!ndo->ndo_suppress_default_print) |
| ND_DEFAULTPRINT(p, caplen); |
| llc_hdrlen = 0; |
| } |
| return (FDDI_HDRLEN + llc_hdrlen); |
| } |
| |
| /* |
| * This is the top level routine of the printer. 'p' points |
| * to the FDDI header of the packet, 'h->ts' is the timestamp, |
| * 'h->len' is the length of the packet off the wire, and 'h->caplen' |
| * is the number of bytes actually captured. |
| */ |
| u_int |
| fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) |
| { |
| return (fddi_print(ndo, p, h->len, h->caplen)); |
| } |