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Diffstat (limited to 'print-fddi.c')
| -rw-r--r-- | print-fddi.c | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/print-fddi.c b/print-fddi.c new file mode 100644 index 0000000..fb8d3ed --- /dev/null +++ b/print-fddi.c @@ -0,0 +1,350 @@ +/* + * 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 "extract.h" +#include "addrtoname.h" + +/* + * Based on Ultrix if_fddi.h + */ + +struct fddi_header { + nd_uint8_t fddi_fc; /* frame control */ + nd_mac_addr fddi_dhost; + nd_mac_addr fddi_shost; +}; + +/* + * 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 void +print_fddi_fc(netdissect_options *ndo, u_char fc) +{ + switch (fc) { + + case FDDIFC_VOID: /* Void frame */ + ND_PRINT("void "); + break; + + case FDDIFC_NRT: /* Nonrestricted token */ + ND_PRINT("nrt "); + break; + + case FDDIFC_RT: /* Restricted token */ + ND_PRINT("rt "); + break; + + case FDDIFC_SMT_INFO: /* SMT Info */ + ND_PRINT("info "); + break; + + case FDDIFC_SMT_NSA: /* SMT Next station adrs */ + ND_PRINT("nsa "); + break; + + case FDDIFC_MAC_BEACON: /* MAC Beacon frame */ + ND_PRINT("beacon "); + break; + + case FDDIFC_MAC_CLAIM: /* MAC Claim frame */ + ND_PRINT("claim "); + break; + + default: + switch (fc & FDDIFC_CLFF) { + + case FDDIFC_MAC: + ND_PRINT("mac%1x ", fc & FDDIFC_ZZZZ); + break; + + case FDDIFC_SMT: + ND_PRINT("smt%1x ", fc & FDDIFC_ZZZZ); + break; + + case FDDIFC_LLC_ASYNC: + ND_PRINT("async%1x ", fc & FDDIFC_ZZZZ); + break; + + case FDDIFC_LLC_SYNC: + ND_PRINT("sync%1x ", fc & FDDIFC_ZZZZ); + break; + + case FDDIFC_IMP_ASYNC: + ND_PRINT("imp_async%1x ", fc & FDDIFC_ZZZZ); + break; + + case FDDIFC_IMP_SYNC: + ND_PRINT("imp_sync%1x ", fc & FDDIFC_ZZZZ); + break; + + default: + ND_PRINT("%02x ", fc); + break; + } + } +} + +/* Extract src, dst addresses */ +static void +extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst) +{ + 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 void +fddi_hdr_print(netdissect_options *ndo, + const struct fddi_header *fddip, u_int length, + const u_char *fsrc, 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, GET_U_1(fddip->fddi_fc)); + ND_PRINT("%s > %s, length %u: ", + srcname, dstname, + length); +} + +static void +fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_) +{ + ND_PRINT("<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; + uint8_t fc; + nd_mac_addr srcmac, dstmac; + struct lladdr_info src, dst; + int llc_hdrlen; + + ndo->ndo_protocol = "fddi"; + if (caplen < FDDI_HDRLEN) { + nd_print_trunc(ndo); + return (caplen); + } + + fc = GET_U_1(fddip->fddi_fc); + + /* + * Get the FDDI addresses into a canonical form + */ + extract_fddi_addrs(fddip, (char *)srcmac, (char *)dstmac); + + if (ndo->ndo_eflag) + fddi_hdr_print(ndo, fddip, length, srcmac, dstmac); + + src.addr = srcmac; + src.addr_string = etheraddr_string; + dst.addr = dstmac; + 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 ((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 ((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, srcmac, + dstmac); + 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. + */ +void +fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) +{ + ndo->ndo_protocol = "fddi"; + ndo->ndo_ll_hdr_len += fddi_print(ndo, p, h->len, h->caplen); +} |