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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22 /*-
23 * Copyright (c) 1991, 1993
24 * The Regents of the University of California. All rights reserved.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 * 1. Redistributions of source code must retain the above copyright
30 * notice, this list of conditions and the following disclaimer.
31 * 2. Redistributions in binary form must reproduce the above copyright
32 * notice, this list of conditions and the following disclaimer in the
33 * documentation and/or other materials provided with the distribution.
34 * 3. All advertising materials mentioning features or use of this software
35 * must display the following acknowledgement:
36 * This product includes software developed by the University of
37 * California, Berkeley and its contributors.
38 * 4. Neither the name of the University nor the names of its contributors
39 * may be used to endorse or promote products derived from this software
40 * without specific prior written permission.
41 *
42 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 *
54 * @(#)clnp_options.c 8.1 (Berkeley) 6/10/93
55 */
56
57 /***********************************************************
58 Copyright IBM Corporation 1987
59
60 All Rights Reserved
61
62 Permission to use, copy, modify, and distribute this software and its
63 documentation for any purpose and without fee is hereby granted,
64 provided that the above copyright notice appear in all copies and that
65 both that copyright notice and this permission notice appear in
66 supporting documentation, and that the name of IBM not be
67 used in advertising or publicity pertaining to distribution of the
68 software without specific, written prior permission.
69
70 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
71 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
72 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
73 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
74 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
75 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
76 SOFTWARE.
77
78 ******************************************************************/
79
80 /*
81 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
82 */
83
84 #if ISO
85
86 #include <sys/param.h>
87 #include <sys/mbuf.h>
88 #include <sys/domain.h>
89 #include <sys/protosw.h>
90 #include <sys/socket.h>
91 #include <sys/socketvar.h>
92 #include <sys/errno.h>
93
94 #include <net/if.h>
95 #include <net/route.h>
96
97 #include <netiso/iso.h>
98 #include <netiso/clnp.h>
99 #include <netiso/clnp_stat.h>
100 #include <netiso/argo_debug.h>
101
102 /*
103 * FUNCTION: clnp_update_srcrt
104 *
105 * PURPOSE: Process src rt option accompanying a clnp datagram.
106 * - bump src route ptr if src routing and
107 * we appear current in src route list.
108 *
109 * RETURNS: none
110 *
111 * SIDE EFFECTS:
112 *
113 * NOTES: If source routing has been terminated, do nothing.
114 */
115 clnp_update_srcrt(options, oidx)
116 struct mbuf *options; /* ptr to options mbuf */
117 struct clnp_optidx *oidx; /* ptr to option index */
118 {
119 u_char len; /* length of current address */
120 struct iso_addr isoa; /* copy current address into here */
121
122 if (CLNPSRCRT_TERM(oidx, options)) {
123 IFDEBUG(D_OPTIONS)
124 printf("clnp_update_srcrt: src rt terminated\n");
125 ENDDEBUG
126 return;
127 }
128
129 len = CLNPSRCRT_CLEN(oidx, options);
130 bcopy(CLNPSRCRT_CADDR(oidx, options), (caddr_t)&isoa, len);
131 isoa.isoa_len = len;
132
133 IFDEBUG(D_OPTIONS)
134 printf("clnp_update_srcrt: current src rt: %s\n",
135 clnp_iso_addrp(&isoa));
136 ENDDEBUG
137
138 if (clnp_ours(&isoa)) {
139 IFDEBUG(D_OPTIONS)
140 printf("clnp_update_srcrt: updating src rt\n");
141 ENDDEBUG
142
143 /* update pointer to next src route */
144 len++; /* count length byte too! */
145 CLNPSRCRT_OFF(oidx, options) += len;
146 }
147 }
148
149 /*
150 * FUNCTION: clnp_dooptions
151 *
152 * PURPOSE: Process options accompanying a clnp datagram.
153 * Processing includes
154 * - log our address if recording route
155 *
156 * RETURNS: none
157 *
158 * SIDE EFFECTS:
159 *
160 * NOTES:
161 */
162 clnp_dooptions(options, oidx, ifp, isoa)
163 struct mbuf *options; /* ptr to options mbuf */
164 struct clnp_optidx *oidx; /* ptr to option index */
165 struct ifnet *ifp; /* ptr to interface pkt is leaving on */
166 struct iso_addr *isoa; /* ptr to our address for this ifp */
167 {
168 /*
169 * If record route is specified, move all
170 * existing records over, and insert the address of
171 * interface passed
172 */
173 if (oidx->cni_recrtp) {
174 char *opt; /* ptr to beginning of recrt option */
175 u_char off; /* offset from opt of first free byte */
176 char *rec_start; /* beginning of new rt recorded */
177
178 opt = CLNP_OFFTOOPT(options, oidx->cni_recrtp);
179 off = *(opt + 1);
180 rec_start = opt + off - 1;
181
182 IFDEBUG(D_OPTIONS)
183 printf("clnp_dooptions: record route: option x%x for %d bytes\n",
184 opt, oidx->cni_recrt_len);
185 printf("\tfree slot offset x%x\n", off);
186 printf("clnp_dooptions: recording %s\n", clnp_iso_addrp(isoa));
187 printf("clnp_dooptions: option dump:\n");
188 dump_buf(opt, oidx->cni_recrt_len);
189 ENDDEBUG
190
191 /* proceed only if recording has not been terminated */
192 if (off != 0xff) {
193 int new_addrlen = isoa->isoa_len + 1;
194 /*
195 * if there is insufficient room to store the next address,
196 * then terminate recording. Plus 1 on isoa_len is for the
197 * length byte itself
198 */
199 if (oidx->cni_recrt_len - (off - 1) < new_addrlen) {
200 *(opt + 1) = 0xff; /* terminate recording */
201 } else {
202 IFDEBUG(D_OPTIONS)
203 printf("clnp_dooptions: new addr at x%x for %d\n",
204 rec_start, new_addrlen);
205 ENDDEBUG
206
207 bcopy((caddr_t)isoa, rec_start, new_addrlen);
208
209 /* update offset field */
210 *(opt + 1) += new_addrlen;
211
212 IFDEBUG(D_OPTIONS)
213 printf("clnp_dooptions: new option dump:\n");
214 dump_buf(opt, oidx->cni_recrt_len);
215 ENDDEBUG
216 }
217 }
218 }
219 }
220
221 /*
222 * FUNCTION: clnp_set_opts
223 *
224 * PURPOSE: Check the data mbuf passed for option sanity. If it is
225 * ok, then set the options ptr to address the data mbuf.
226 * If an options mbuf exists, free it. This implies that
227 * any old options will be lost. If data is NULL, simply
228 * free any old options.
229 *
230 * RETURNS: unix error code
231 *
232 * SIDE EFFECTS:
233 *
234 * NOTES:
235 */
236 clnp_set_opts(options, data)
237 struct mbuf **options; /* target for option information */
238 struct mbuf **data; /* source of option information */
239 {
240 int error = 0; /* error return value */
241 struct clnp_optidx dummy; /* dummy index - not used */
242
243 /*
244 * remove any existing options
245 */
246 if (*options != NULL) {
247 m_freem(*options);
248 *options = NULL;
249 }
250
251 if (*data != NULL) {
252 /*
253 * Insure that the options are reasonable.
254 *
255 * Also, we do not support security, priority,
256 * nor do we allow one to send an ER option
257 *
258 * The QOS parameter is checked for the DECBIT.
259 */
260 if ((clnp_opt_sanity(*data, mtod(*data, caddr_t), (*data)->m_len,
261 &dummy) != 0) ||
262 (dummy.cni_securep) ||
263 (dummy.cni_priorp) ||
264 (dummy.cni_er_reason != ER_INVALREAS)) {
265 error = EINVAL;
266 } else {
267 *options = *data;
268 *data = NULL; /* so caller won't free mbuf @ *data */
269 }
270 }
271 return error;
272 }
273
274 /*
275 * FUNCTION: clnp_opt_sanity
276 *
277 * PURPOSE: Check the options (beginning at opts for len bytes) for
278 * sanity. In addition, fill in the option index structure
279 * in with information about each option discovered.
280 *
281 * RETURNS: success (options check out) - 0
282 * failure - an ER pdu error code describing failure
283 *
284 * SIDE EFFECTS:
285 *
286 * NOTES: Each pointer field of the option index is filled in with
287 * the offset from the beginning of the mbuf data, not the
288 * actual address.
289 */
290 clnp_opt_sanity(m, opts, len, oidx)
291 struct mbuf *m; /* mbuf options reside in */
292 caddr_t opts; /* ptr to buffer containing options */
293 int len; /* length of buffer */
294 struct clnp_optidx *oidx; /* RETURN: filled in with option idx info */
295 {
296 u_char opcode; /* code of particular option */
297 u_char oplen; /* length of a particular option */
298 caddr_t opts_end; /* ptr to end of options */
299 u_char pad = 0, secure = 0, srcrt = 0, recrt = 0, qos = 0, prior = 0;
300 /* flags for catching duplicate options */
301
302 IFDEBUG(D_OPTIONS)
303 printf("clnp_opt_sanity: checking %d bytes of data:\n", len);
304 dump_buf(opts, len);
305 ENDDEBUG
306
307 /* clear option index field if passed */
308 bzero((caddr_t)oidx, sizeof(struct clnp_optidx));
309
310 /*
311 * We need to indicate whether the ER option is present. This is done
312 * by overloading the er_reason field to also indicate presense of
313 * the option along with the option value. I would like ER_INVALREAS
314 * to have value 0, but alas, 0 is a valid er reason...
315 */
316 oidx->cni_er_reason = ER_INVALREAS;
317
318 opts_end = opts + len;
319 while (opts < opts_end) {
320 /* must have at least 2 bytes per option (opcode and len) */
321 if (opts + 2 > opts_end)
322 return(GEN_INCOMPLETE);
323
324 opcode = *opts++;
325 oplen = *opts++;
326 IFDEBUG(D_OPTIONS)
327 printf("clnp_opt_sanity: opcode is %x and oplen %d\n",
328 opcode, oplen);
329 printf("clnp_opt_sanity: clnpoval_SRCRT is %x\n", CLNPOVAL_SRCRT);
330
331 switch (opcode) {
332 case CLNPOVAL_PAD: {
333 printf("CLNPOVAL_PAD\n");
334 } break;
335 case CLNPOVAL_SECURE: {
336 printf("CLNPOVAL_SECURE\n");
337 } break;
338 case CLNPOVAL_SRCRT: {
339 printf("CLNPOVAL_SRCRT\n");
340 } break;
341 case CLNPOVAL_RECRT: {
342 printf("CLNPOVAL_RECRT\n");
343 } break;
344 case CLNPOVAL_QOS: {
345 printf("CLNPOVAL_QOS\n");
346 } break;
347 case CLNPOVAL_PRIOR: {
348 printf("CLNPOVAL_PRIOR\n");
349 } break;
350 case CLNPOVAL_ERREAS: {
351 printf("CLNPOVAL_ERREAS\n");
352 } break;
353 default:
354 printf("UKNOWN option %x\n", opcode);
355 }
356 ENDDEBUG
357
358 /* don't allow crazy length values */
359 if (opts + oplen > opts_end)
360 return(GEN_INCOMPLETE);
361
362 switch (opcode) {
363 case CLNPOVAL_PAD:
364 /*
365 * Padding: increment pointer by length of padding
366 */
367 if (pad++) /* duplicate ? */
368 return(GEN_DUPOPT);
369 opts += oplen;
370 break;
371
372 case CLNPOVAL_SECURE: {
373 u_char format = *opts;
374
375 if (secure++) /* duplicate ? */
376 return(GEN_DUPOPT);
377 /*
378 * Security: high 2 bits of first octet indicate format
379 * (00 in high bits is reserved).
380 * Remaining bits must be 0. Remaining octets indicate
381 * actual security
382 */
383 if (((format & 0x3f) > 0) || /* low 6 bits set ? */
384 ((format & 0xc0) == 0)) /* high 2 bits zero ? */
385 return(GEN_HDRSYNTAX);
386
387 oidx->cni_securep = CLNP_OPTTOOFF(m, opts);
388 oidx->cni_secure_len = oplen;
389 opts += oplen;
390 } break;
391
392 case CLNPOVAL_SRCRT: {
393 u_char type, offset; /* type of rt, offset of start */
394 caddr_t route_end; /* address of end of route option */
395
396 IFDEBUG(D_OPTIONS)
397 printf("clnp_opt_sanity: SRC RT\n");
398 ENDDEBUG
399
400 if (srcrt++) /* duplicate ? */
401 return(GEN_DUPOPT);
402 /*
403 * source route: There must be 2 bytes following the length
404 * field: type and offset. The type must be either
405 * partial route or complete route. The offset field must
406 * be within the option. A single exception is made, however.
407 * The offset may be 1 greater than the length. This case
408 * occurs when the last source route record is consumed.
409 * In this case, we ignore the source route option.
410 * RAH? You should be able to set offset to 'ff' like in record
411 * route!
412 * Following this is a series of address fields.
413 * Each address field is composed of a (length, address) pair.
414 * Insure that the offset and each address length is reasonable
415 */
416 route_end = opts + oplen;
417
418 if (opts + 2 > route_end)
419 return(SRCRT_SYNTAX);
420
421 type = *opts;
422 offset = *(opts+1);
423
424
425 /* type must be partial or complete */
426 if (!((type == CLNPOVAL_PARTRT) || (type == CLNPOVAL_COMPRT)))
427 return(SRCRT_SYNTAX);
428
429 oidx->cni_srcrt_s = CLNP_OPTTOOFF(m, opts);
430 oidx->cni_srcrt_len = oplen;
431
432 opts += offset-1; /*set opts to first addr in rt */
433
434 /*
435 * Offset must be reasonable:
436 * less than end of options, or equal to end of options
437 */
438 if (opts >= route_end) {
439 if (opts == route_end) {
440 IFDEBUG(D_OPTIONS)
441 printf("clnp_opt_sanity: end of src route info\n");
442 ENDDEBUG
443 break;
444 } else
445 return(SRCRT_SYNTAX);
446 }
447
448 while (opts < route_end) {
449 u_char addrlen = *opts++;
450 if (opts + addrlen > route_end)
451 return(SRCRT_SYNTAX);
452 opts += addrlen;
453 }
454 } break;
455 case CLNPOVAL_RECRT: {
456 u_char type, offset; /* type of rt, offset of start */
457 caddr_t record_end; /* address of end of record option */
458
459 if (recrt++) /* duplicate ? */
460 return(GEN_DUPOPT);
461 /*
462 * record route: after the length field, expect a
463 * type and offset. Type must be partial or complete.
464 * Offset indicates where to start recording. Insure it
465 * is within the option. All ones for offset means
466 * recording is terminated.
467 */
468 record_end = opts + oplen;
469
470 oidx->cni_recrtp = CLNP_OPTTOOFF(m, opts);
471 oidx->cni_recrt_len = oplen;
472
473 if (opts + 2 > record_end)
474 return(GEN_INCOMPLETE);
475
476 type = *opts;
477 offset = *(opts+1);
478
479 /* type must be partial or complete */
480 if (!((type == CLNPOVAL_PARTRT) || (type == CLNPOVAL_COMPRT)))
481 return(GEN_HDRSYNTAX);
482
483 /* offset must be reasonable */
484 if ((offset < 0xff) && (opts + offset > record_end))
485 return(GEN_HDRSYNTAX);
486 opts += oplen;
487 } break;
488 case CLNPOVAL_QOS: {
489 u_char format = *opts;
490
491 if (qos++) /* duplicate ? */
492 return(GEN_DUPOPT);
493 /*
494 * qos: high 2 bits of first octet indicate format
495 * (00 in high bits is reserved).
496 * Remaining bits must be 0 (unless format indicates
497 * globally unique qos, in which case remaining bits indicate
498 * qos (except bit 6 which is reserved)). Otherwise,
499 * remaining octets indicate actual qos.
500 */
501 if (((format & 0xc0) == 0) || /* high 2 bits zero ? */
502 (((format & 0xc0) != CLNPOVAL_GLOBAL) &&
503 ((format & 0x3f) > 0))) /* not global,low bits used ? */
504 return(GEN_HDRSYNTAX);
505
506 oidx->cni_qos_formatp = CLNP_OPTTOOFF(m, opts);
507 oidx->cni_qos_len = oplen;
508
509 opts += oplen;
510 } break;
511
512 case CLNPOVAL_PRIOR: {
513 if (prior++) /* duplicate ? */
514 return(GEN_DUPOPT);
515 /*
516 * priority: value must be one byte long
517 */
518 if (oplen != 1)
519 return(GEN_HDRSYNTAX);
520
521 oidx->cni_priorp = CLNP_OPTTOOFF(m, opts);
522
523 opts += oplen;
524 } break;
525
526 case CLNPOVAL_ERREAS: {
527 /*
528 * er reason: value must be two bytes long
529 */
530 if (oplen != 2)
531 return(GEN_HDRSYNTAX);
532
533 oidx->cni_er_reason = *opts;
534
535 opts += oplen;
536 } break;
537
538 default: {
539 IFDEBUG(D_OPTIONS)
540 printf("clnp_opt_sanity: UNKNOWN OPTION 0x%x\n", opcode);
541 ENDDEBUG
542 return(DISC_UNSUPPOPT);
543 }
544 }
545 }
546 IFDEBUG(D_OPTIONS)
547 printf("clnp_opt_sanity: return(0)\n", opcode);
548 ENDDEBUG
549 return(0);
550 }
551 #endif /* ISO */
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