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12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-fddi.c,v 1.64 2004/03/17 23:24:37 guy Exp $ (LBL)";
31 #include <tcpdump-stdinc.h>
37 #include "interface.h"
38 #include "addrtoname.h"
39 #include "ethertype.h"
45 * Some FDDI interfaces use bit-swapped addresses.
47 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__)
54 * FDDI support for tcpdump, by Jeffrey Mogul [DECWRL], June 1992
56 * Based in part on code by Van Jacobson, which bears this note:
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
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...
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,
119 * Print FDDI frame-control bits
122 print_fddi_fc(u_char fc)
126 case FDDIFC_VOID: /* Void frame */
130 case FDDIFC_NRT: /* Nonrestricted token */
134 case FDDIFC_RT: /* Restricted token */
138 case FDDIFC_SMT_INFO: /* SMT Info */
142 case FDDIFC_SMT_NSA: /* SMT Next station adrs */
146 case FDDIFC_MAC_BEACON: /* MAC Beacon frame */
150 case FDDIFC_MAC_CLAIM: /* MAC Claim frame */
155 switch (fc & FDDIFC_CLFF) {
158 printf("mac%1x ", fc & FDDIFC_ZZZZ);
162 printf("smt%1x ", fc & FDDIFC_ZZZZ);
165 case FDDIFC_LLC_ASYNC:
166 printf("async%1x ", fc & FDDIFC_ZZZZ);
169 case FDDIFC_LLC_SYNC:
170 printf("sync%1x ", fc & FDDIFC_ZZZZ);
173 case FDDIFC_IMP_ASYNC:
174 printf("imp_async%1x ", fc & FDDIFC_ZZZZ);
177 case FDDIFC_IMP_SYNC:
178 printf("imp_sync%1x ", fc & FDDIFC_ZZZZ);
188 /* Extract src, dst addresses */
190 extract_fddi_addrs(const struct fddi_header *fddip, char *fsrc, char *fdst)
196 * bit-swap the fddi addresses (isn't the IEEE standards
197 * process wonderful!) then convert them to names.
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]];
205 memcpy(fdst, (const char *)fddip->fddi_dhost, 6);
206 memcpy(fsrc, (const char *)fddip->fddi_shost, 6);
211 * Print the FDDI MAC header
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)
217 const char *srcname, *dstname;
219 srcname = etheraddr_string(fsrc);
220 dstname = etheraddr_string(fdst);
223 (void) printf("%02x %s %s %d: ",
228 printf("%s %s %d: ", srcname, dstname, length);
230 (void) print_fddi_fc(fddip->fddi_fc);
231 (void) printf("%s %s %d: ", srcname, dstname, length);
236 fddi_smt_print(const u_char *p _U_, u_int length _U_)
238 printf("<SMT printer not yet implemented>");
242 fddi_print(const u_char *p, u_int length, u_int caplen)
244 const struct fddi_header *fddip = (const struct fddi_header *)p;
245 struct ether_header ehdr;
246 u_short extracted_ethertype;
248 if (caplen < FDDI_HDRLEN) {
254 * Get the FDDI addresses into a canonical form
256 extract_fddi_addrs(fddip, (char *)ESRC(&ehdr), (char *)EDST(&ehdr));
259 fddi_hdr_print(fddip, length, ESRC(&ehdr), EDST(&ehdr));
261 /* Skip over FDDI MAC header */
262 length -= FDDI_HDRLEN;
264 caplen -= FDDI_HDRLEN;
266 /* Frame Control field determines interpretation of packet */
267 extracted_ethertype = 0;
268 if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
269 /* Try to print the LLC-layer header & higher layers */
270 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
271 &extracted_ethertype) == 0) {
273 * Some kinds of LLC packet we cannot
274 * handle intelligently
277 fddi_hdr_print(fddip, length + FDDI_HDRLEN,
278 ESRC(&ehdr), EDST(&ehdr));
279 if (extracted_ethertype) {
281 etherproto_string(htons(extracted_ethertype)));
283 if (!xflag && !qflag)
284 default_print(p, caplen);
286 } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
287 fddi_smt_print(p, caplen);
289 /* Some kinds of FDDI packet we cannot handle intelligently */
291 fddi_hdr_print(fddip, length + FDDI_HDRLEN, ESRC(&ehdr),
293 if (!xflag && !qflag)
294 default_print(p, caplen);
299 * This is the top level routine of the printer. 'p' points
300 * to the FDDI header of the packet, 'h->ts' is the timestamp,
301 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
302 * is the number of bytes actually captured.
305 fddi_if_print(const struct pcap_pkthdr *h, register const u_char *p)
307 fddi_print(p, h->len, h->caplen);
309 return (FDDI_HDRLEN);