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1 office 1 /*
2 * Copyright (c) 1988, 1989, 1990, 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 * From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
22 */
23  
24 #define NETDISSECT_REWORKED
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28  
29 #include <tcpdump-stdinc.h>
30  
31 #include "interface.h"
32 #include "extract.h"
33  
34 /*
35 * from: NetBSD: if_arc.h,v 1.13 1999/11/19 20:41:19 thorpej Exp
36 */
37  
38 /*
39 * Structure of a 2.5MB/s Arcnet header on the BSDs,
40 * as given to interface code.
41 */
42 struct arc_header {
43 uint8_t arc_shost;
44 uint8_t arc_dhost;
45 uint8_t arc_type;
46 /*
47 * only present for newstyle encoding with LL fragmentation.
48 * Don't use sizeof(anything), use ARC_HDR{,NEW}LEN instead.
49 */
50 uint8_t arc_flag;
51 uint16_t arc_seqid;
52  
53 /*
54 * only present in exception packets (arc_flag == 0xff)
55 */
56 uint8_t arc_type2; /* same as arc_type */
57 uint8_t arc_flag2; /* real flag value */
58 uint16_t arc_seqid2; /* real seqid value */
59 };
60  
61 #define ARC_HDRLEN 3
62 #define ARC_HDRNEWLEN 6
63 #define ARC_HDRNEWLEN_EXC 10
64  
65 /* RFC 1051 */
66 #define ARCTYPE_IP_OLD 240 /* IP protocol */
67 #define ARCTYPE_ARP_OLD 241 /* address resolution protocol */
68  
69 /* RFC 1201 */
70 #define ARCTYPE_IP 212 /* IP protocol */
71 #define ARCTYPE_ARP 213 /* address resolution protocol */
72 #define ARCTYPE_REVARP 214 /* reverse addr resolution protocol */
73  
74 #define ARCTYPE_ATALK 221 /* Appletalk */
75 #define ARCTYPE_BANIAN 247 /* Banyan Vines */
76 #define ARCTYPE_IPX 250 /* Novell IPX */
77  
78 #define ARCTYPE_INET6 0xc4 /* IPng */
79 #define ARCTYPE_DIAGNOSE 0x80 /* as per ANSI/ATA 878.1 */
80  
81 /*
82 * Structure of a 2.5MB/s Arcnet header on Linux. Linux has
83 * an extra "offset" field when given to interface code, and
84 * never presents packets that look like exception frames.
85 */
86 struct arc_linux_header {
87 uint8_t arc_shost;
88 uint8_t arc_dhost;
89 uint16_t arc_offset;
90 uint8_t arc_type;
91 /*
92 * only present for newstyle encoding with LL fragmentation.
93 * Don't use sizeof(anything), use ARC_LINUX_HDR{,NEW}LEN
94 * instead.
95 */
96 uint8_t arc_flag;
97 uint16_t arc_seqid;
98 };
99  
100 #define ARC_LINUX_HDRLEN 5
101 #define ARC_LINUX_HDRNEWLEN 8
102  
103 static int arcnet_encap_print(netdissect_options *, u_char arctype, const u_char *p,
104 u_int length, u_int caplen);
105  
106 static const struct tok arctypemap[] = {
107 { ARCTYPE_IP_OLD, "oldip" },
108 { ARCTYPE_ARP_OLD, "oldarp" },
109 { ARCTYPE_IP, "ip" },
110 { ARCTYPE_ARP, "arp" },
111 { ARCTYPE_REVARP, "rarp" },
112 { ARCTYPE_ATALK, "atalk" },
113 { ARCTYPE_BANIAN, "banyan" },
114 { ARCTYPE_IPX, "ipx" },
115 { ARCTYPE_INET6, "ipv6" },
116 { ARCTYPE_DIAGNOSE, "diag" },
117 { 0, 0 }
118 };
119  
120 static inline void
121 arcnet_print(netdissect_options *ndo, const u_char *bp, u_int length, int phds,
122 int flag, u_int seqid)
123 {
124 const struct arc_header *ap;
125 const char *arctypename;
126  
127  
128 ap = (const struct arc_header *)bp;
129  
130  
131 if (ndo->ndo_qflag) {
132 ND_PRINT((ndo, "%02x %02x %d: ",
133 ap->arc_shost,
134 ap->arc_dhost,
135 length));
136 return;
137 }
138  
139 arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
140  
141 if (!phds) {
142 ND_PRINT((ndo, "%02x %02x %s %d: ",
143 ap->arc_shost, ap->arc_dhost, arctypename,
144 length));
145 return;
146 }
147  
148 if (flag == 0) {
149 ND_PRINT((ndo, "%02x %02x %s seqid %04x %d: ",
150 ap->arc_shost, ap->arc_dhost, arctypename, seqid,
151 length));
152 return;
153 }
154  
155 if (flag & 1)
156 ND_PRINT((ndo, "%02x %02x %s seqid %04x "
157 "(first of %d fragments) %d: ",
158 ap->arc_shost, ap->arc_dhost, arctypename, seqid,
159 (flag + 3) / 2, length));
160 else
161 ND_PRINT((ndo, "%02x %02x %s seqid %04x "
162 "(fragment %d) %d: ",
163 ap->arc_shost, ap->arc_dhost, arctypename, seqid,
164 flag/2 + 1, length));
165 }
166  
167 /*
168 * This is the top level routine of the printer. 'p' points
169 * to the ARCNET header of the packet, 'h->ts' is the timestamp,
170 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
171 * is the number of bytes actually captured.
172 */
173 u_int
174 arcnet_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
175 {
176 u_int caplen = h->caplen;
177 u_int length = h->len;
178 const struct arc_header *ap;
179  
180 int phds, flag = 0, archdrlen = 0;
181 u_int seqid = 0;
182 u_char arc_type;
183  
184 if (caplen < ARC_HDRLEN || length < ARC_HDRLEN) {
185 ND_PRINT((ndo, "[|arcnet]"));
186 return (caplen);
187 }
188  
189 ap = (const struct arc_header *)p;
190 arc_type = ap->arc_type;
191  
192 switch (arc_type) {
193 default:
194 phds = 1;
195 break;
196 case ARCTYPE_IP_OLD:
197 case ARCTYPE_ARP_OLD:
198 case ARCTYPE_DIAGNOSE:
199 phds = 0;
200 archdrlen = ARC_HDRLEN;
201 break;
202 }
203  
204 if (phds) {
205 if (caplen < ARC_HDRNEWLEN || length < ARC_HDRNEWLEN) {
206 arcnet_print(ndo, p, length, 0, 0, 0);
207 ND_PRINT((ndo, "[|phds]"));
208 return (caplen);
209 }
210  
211 if (ap->arc_flag == 0xff) {
212 if (caplen < ARC_HDRNEWLEN_EXC || length < ARC_HDRNEWLEN_EXC) {
213 arcnet_print(ndo, p, length, 0, 0, 0);
214 ND_PRINT((ndo, "[|phds extended]"));
215 return (caplen);
216 }
217 flag = ap->arc_flag2;
218 seqid = EXTRACT_16BITS(&ap->arc_seqid2);
219 archdrlen = ARC_HDRNEWLEN_EXC;
220 } else {
221 flag = ap->arc_flag;
222 seqid = EXTRACT_16BITS(&ap->arc_seqid);
223 archdrlen = ARC_HDRNEWLEN;
224 }
225 }
226  
227  
228 if (ndo->ndo_eflag)
229 arcnet_print(ndo, p, length, phds, flag, seqid);
230  
231 /*
232 * Go past the ARCNET header.
233 */
234 length -= archdrlen;
235 caplen -= archdrlen;
236 p += archdrlen;
237  
238 if (phds && flag && (flag & 1) == 0) {
239 /*
240 * This is a middle fragment.
241 */
242 return (archdrlen);
243 }
244  
245 if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
246 ND_DEFAULTPRINT(p, caplen);
247  
248 return (archdrlen);
249 }
250  
251 /*
252 * This is the top level routine of the printer. 'p' points
253 * to the ARCNET header of the packet, 'h->ts' is the timestamp,
254 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
255 * is the number of bytes actually captured. It is quite similar
256 * to the non-Linux style printer except that Linux doesn't ever
257 * supply packets that look like exception frames, it always supplies
258 * reassembled packets rather than raw frames, and headers have an
259 * extra "offset" field between the src/dest and packet type.
260 */
261 u_int
262 arcnet_linux_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
263 {
264 u_int caplen = h->caplen;
265 u_int length = h->len;
266 const struct arc_linux_header *ap;
267  
268 int archdrlen = 0;
269 u_char arc_type;
270  
271 if (caplen < ARC_LINUX_HDRLEN || length < ARC_LINUX_HDRLEN) {
272 ND_PRINT((ndo, "[|arcnet]"));
273 return (caplen);
274 }
275  
276 ap = (const struct arc_linux_header *)p;
277 arc_type = ap->arc_type;
278  
279 switch (arc_type) {
280 default:
281 archdrlen = ARC_LINUX_HDRNEWLEN;
282 if (caplen < ARC_LINUX_HDRNEWLEN || length < ARC_LINUX_HDRNEWLEN) {
283 ND_PRINT((ndo, "[|arcnet]"));
284 return (caplen);
285 }
286 break;
287 case ARCTYPE_IP_OLD:
288 case ARCTYPE_ARP_OLD:
289 case ARCTYPE_DIAGNOSE:
290 archdrlen = ARC_LINUX_HDRLEN;
291 break;
292 }
293  
294 if (ndo->ndo_eflag)
295 arcnet_print(ndo, p, length, 0, 0, 0);
296  
297 /*
298 * Go past the ARCNET header.
299 */
300 length -= archdrlen;
301 caplen -= archdrlen;
302 p += archdrlen;
303  
304 if (!arcnet_encap_print(ndo, arc_type, p, length, caplen))
305 ND_DEFAULTPRINT(p, caplen);
306  
307 return (archdrlen);
308 }
309  
310 /*
311 * Prints the packet encapsulated in an ARCnet data field,
312 * given the ARCnet system code.
313 *
314 * Returns non-zero if it can do so, zero if the system code is unknown.
315 */
316  
317  
318 static int
319 arcnet_encap_print(netdissect_options *ndo, u_char arctype, const u_char *p,
320 u_int length, u_int caplen)
321 {
322 switch (arctype) {
323  
324 case ARCTYPE_IP_OLD:
325 case ARCTYPE_IP:
326 ip_print(ndo, p, length);
327 return (1);
328  
329 case ARCTYPE_INET6:
330 ip6_print(ndo, p, length);
331 return (1);
332  
333 case ARCTYPE_ARP_OLD:
334 case ARCTYPE_ARP:
335 case ARCTYPE_REVARP:
336 arp_print(ndo, p, length, caplen);
337 return (1);
338  
339 case ARCTYPE_ATALK: /* XXX was this ever used? */
340 if (ndo->ndo_vflag)
341 ND_PRINT((ndo, "et1 "));
342 atalk_print(ndo, p, length);
343 return (1);
344  
345 case ARCTYPE_IPX:
346 ipx_print(ndo, p, length);
347 return (1);
348  
349 default:
350 return (0);
351 }
352 }
353  
354 /*
355 * Local Variables:
356 * c-style: bsd
357 * End:
358 */
359