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31#include <linux/types.h>
32#include <linux/module.h>
33
34#include <asm/unaligned.h>
35#include <asm/byteorder.h>
36
37#include <net/irda/irda.h>
38#include <net/irda/parameters.h>
39
40static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi,
41 PV_TYPE type, PI_HANDLER func);
42static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,
43 PV_TYPE type, PI_HANDLER func);
44static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi,
45 PV_TYPE type, PI_HANDLER func);
46static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi,
47 PV_TYPE type, PI_HANDLER func);
48
49static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi,
50 PV_TYPE type, PI_HANDLER func);
51static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi,
52 PV_TYPE type, PI_HANDLER func);
53
54static int irda_param_unpack(__u8 *buf, char *fmt, ...);
55
56
57static PV_HANDLER pv_extract_table[] = {
58 irda_extract_integer,
59 irda_extract_integer,
60 irda_extract_integer,
61 irda_extract_string,
62 irda_extract_integer,
63 irda_extract_octseq,
64 irda_extract_no_value
65};
66
67static PV_HANDLER pv_insert_table[] = {
68 irda_insert_integer,
69 irda_insert_integer,
70 irda_insert_integer,
71 NULL,
72 irda_insert_integer,
73 NULL,
74 irda_insert_no_value
75};
76
77
78
79
80static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi,
81 PV_TYPE type, PI_HANDLER func)
82{
83 irda_param_t p;
84 int ret;
85
86 p.pi = pi;
87 p.pl = 0;
88
89
90 ret = (*func)(self, &p, PV_GET);
91
92
93 irda_param_pack(buf, "bb", p.pi, p.pl);
94
95 if (ret < 0)
96 return ret;
97
98 return 2;
99}
100
101
102
103
104
105
106
107static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi,
108 PV_TYPE type, PI_HANDLER func)
109{
110 irda_param_t p;
111 int ret;
112
113
114 irda_param_unpack(buf, "bb", &p.pi, &p.pl);
115
116
117 ret = (*func)(self, &p, PV_PUT);
118
119 if (ret < 0)
120 return ret;
121
122 return 2;
123}
124
125
126
127
128static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi,
129 PV_TYPE type, PI_HANDLER func)
130{
131 irda_param_t p;
132 int n = 0;
133 int err;
134
135 p.pi = pi;
136 p.pl = type & PV_MASK;
137 p.pv.i = 0;
138
139
140 err = (*func)(self, &p, PV_GET);
141 if (err < 0)
142 return err;
143
144
145
146
147
148
149 if (p.pl == 0) {
150 if (p.pv.i < 0xff) {
151 IRDA_DEBUG(2, "%s(), using 1 byte\n", __func__);
152 p.pl = 1;
153 } else if (p.pv.i < 0xffff) {
154 IRDA_DEBUG(2, "%s(), using 2 bytes\n", __func__);
155 p.pl = 2;
156 } else {
157 IRDA_DEBUG(2, "%s(), using 4 bytes\n", __func__);
158 p.pl = 4;
159 }
160 }
161
162 if (len < (2+p.pl)) {
163 IRDA_WARNING("%s: buffer too short for insertion!\n",
164 __func__);
165 return -1;
166 }
167 IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__,
168 p.pi, p.pl, p.pv.i);
169 switch (p.pl) {
170 case 1:
171 n += irda_param_pack(buf, "bbb", p.pi, p.pl, (__u8) p.pv.i);
172 break;
173 case 2:
174 if (type & PV_BIG_ENDIAN)
175 p.pv.i = cpu_to_be16((__u16) p.pv.i);
176 else
177 p.pv.i = cpu_to_le16((__u16) p.pv.i);
178 n += irda_param_pack(buf, "bbs", p.pi, p.pl, (__u16) p.pv.i);
179 break;
180 case 4:
181 if (type & PV_BIG_ENDIAN)
182 cpu_to_be32s(&p.pv.i);
183 else
184 cpu_to_le32s(&p.pv.i);
185 n += irda_param_pack(buf, "bbi", p.pi, p.pl, p.pv.i);
186
187 break;
188 default:
189 IRDA_WARNING("%s: length %d not supported\n",
190 __func__, p.pl);
191
192 return -1;
193 }
194
195 return p.pl+2;
196}
197
198
199
200
201
202
203
204static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi,
205 PV_TYPE type, PI_HANDLER func)
206{
207 irda_param_t p;
208 int n = 0;
209 int extract_len;
210 int err;
211
212 p.pi = pi;
213 p.pl = buf[1];
214 p.pv.i = 0;
215 extract_len = p.pl;
216
217
218 if (len < (2+p.pl)) {
219 IRDA_WARNING("%s: buffer too short for parsing! "
220 "Need %d bytes, but len is only %d\n",
221 __func__, p.pl, len);
222 return -1;
223 }
224
225
226
227
228
229
230 if (((type & PV_MASK) != PV_INTEGER) && ((type & PV_MASK) != p.pl)) {
231 IRDA_ERROR("%s: invalid parameter length! "
232 "Expected %d bytes, but value had %d bytes!\n",
233 __func__, type & PV_MASK, p.pl);
234
235
236
237
238
239
240
241 if((p.pl < (type & PV_MASK)) || (type & PV_BIG_ENDIAN)) {
242
243 return p.pl+2;
244 } else {
245
246 extract_len = type & PV_MASK;
247 }
248 }
249
250
251 switch (extract_len) {
252 case 1:
253 n += irda_param_unpack(buf+2, "b", &p.pv.i);
254 break;
255 case 2:
256 n += irda_param_unpack(buf+2, "s", &p.pv.i);
257 if (type & PV_BIG_ENDIAN)
258 p.pv.i = be16_to_cpu((__u16) p.pv.i);
259 else
260 p.pv.i = le16_to_cpu((__u16) p.pv.i);
261 break;
262 case 4:
263 n += irda_param_unpack(buf+2, "i", &p.pv.i);
264 if (type & PV_BIG_ENDIAN)
265 be32_to_cpus(&p.pv.i);
266 else
267 le32_to_cpus(&p.pv.i);
268 break;
269 default:
270 IRDA_WARNING("%s: length %d not supported\n",
271 __func__, p.pl);
272
273
274 return p.pl+2;
275 }
276
277 IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d, pi=%d\n", __func__,
278 p.pi, p.pl, p.pv.i);
279
280 err = (*func)(self, &p, PV_PUT);
281 if (err < 0)
282 return err;
283
284 return p.pl+2;
285}
286
287
288
289
290static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,
291 PV_TYPE type, PI_HANDLER func)
292{
293 char str[33];
294 irda_param_t p;
295 int err;
296
297 IRDA_DEBUG(2, "%s()\n", __func__);
298
299 p.pi = pi;
300 p.pl = buf[1];
301 if (p.pl > 32)
302 p.pl = 32;
303
304 IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __func__,
305 p.pi, p.pl);
306
307
308 if (len < (2+p.pl)) {
309 IRDA_WARNING("%s: buffer too short for parsing! "
310 "Need %d bytes, but len is only %d\n",
311 __func__, p.pl, len);
312 return -1;
313 }
314
315
316
317 strncpy(str, buf+2, p.pl);
318
319 IRDA_DEBUG(2, "%s(), str=0x%02x 0x%02x\n", __func__,
320 (__u8) str[0], (__u8) str[1]);
321
322
323 str[p.pl] = '\0';
324
325 p.pv.c = str;
326
327
328 err = (*func)(self, &p, PV_PUT);
329 if (err < 0)
330 return err;
331
332 return p.pl+2;
333}
334
335
336
337
338static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi,
339 PV_TYPE type, PI_HANDLER func)
340{
341 irda_param_t p;
342
343 p.pi = pi;
344 p.pl = buf[1];
345
346
347 if (len < (2+p.pl)) {
348 IRDA_WARNING("%s: buffer too short for parsing! "
349 "Need %d bytes, but len is only %d\n",
350 __func__, p.pl, len);
351 return -1;
352 }
353
354 IRDA_DEBUG(0, "%s(), not impl\n", __func__);
355
356 return p.pl+2;
357}
358
359
360
361
362
363
364
365
366
367int irda_param_pack(__u8 *buf, char *fmt, ...)
368{
369 irda_pv_t arg;
370 va_list args;
371 char *p;
372 int n = 0;
373
374 va_start(args, fmt);
375
376 for (p = fmt; *p != '\0'; p++) {
377 switch (*p) {
378 case 'b':
379 buf[n++] = (__u8)va_arg(args, int);
380 break;
381 case 's':
382 arg.i = (__u16)va_arg(args, int);
383 put_unaligned((__u16)arg.i, (__u16 *)(buf+n)); n+=2;
384 break;
385 case 'i':
386 arg.i = va_arg(args, __u32);
387 put_unaligned(arg.i, (__u32 *)(buf+n)); n+=4;
388 break;
389#if 0
390 case 'c':
391 arg.c = va_arg(args, char *);
392 strcpy(buf+n, arg.c);
393 n += strlen(arg.c) + 1;
394 break;
395#endif
396 default:
397 va_end(args);
398 return -1;
399 }
400 }
401 va_end(args);
402
403 return 0;
404}
405EXPORT_SYMBOL(irda_param_pack);
406
407
408
409
410static int irda_param_unpack(__u8 *buf, char *fmt, ...)
411{
412 irda_pv_t arg;
413 va_list args;
414 char *p;
415 int n = 0;
416
417 va_start(args, fmt);
418
419 for (p = fmt; *p != '\0'; p++) {
420 switch (*p) {
421 case 'b':
422 arg.ip = va_arg(args, __u32 *);
423 *arg.ip = buf[n++];
424 break;
425 case 's':
426 arg.ip = va_arg(args, __u32 *);
427 *arg.ip = get_unaligned((__u16 *)(buf+n)); n+=2;
428 break;
429 case 'i':
430 arg.ip = va_arg(args, __u32 *);
431 *arg.ip = get_unaligned((__u32 *)(buf+n)); n+=4;
432 break;
433#if 0
434 case 'c':
435 arg.c = va_arg(args, char *);
436 strcpy(arg.c, buf+n);
437 n += strlen(arg.c) + 1;
438 break;
439#endif
440 default:
441 va_end(args);
442 return -1;
443 }
444
445 }
446 va_end(args);
447
448 return 0;
449}
450
451
452
453
454
455
456
457int irda_param_insert(void *self, __u8 pi, __u8 *buf, int len,
458 pi_param_info_t *info)
459{
460 pi_minor_info_t *pi_minor_info;
461 __u8 pi_minor;
462 __u8 pi_major;
463 int type;
464 int ret = -1;
465 int n = 0;
466
467 IRDA_ASSERT(buf != NULL, return ret;);
468 IRDA_ASSERT(info != NULL, return ret;);
469
470 pi_minor = pi & info->pi_mask;
471 pi_major = pi >> info->pi_major_offset;
472
473
474 if ((pi_major > info->len-1) ||
475 (pi_minor > info->tables[pi_major].len-1))
476 {
477 IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n",
478 __func__, pi);
479
480
481 return -1;
482 }
483
484
485 pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor];
486
487
488 type = pi_minor_info->type;
489
490
491 if (!pi_minor_info->func) {
492 IRDA_MESSAGE("%s: no handler for pi=%#x\n", __func__, pi);
493
494 return -1;
495 }
496
497
498 ret = (*pv_insert_table[type & PV_MASK])(self, buf+n, len, pi, type,
499 pi_minor_info->func);
500 return ret;
501}
502EXPORT_SYMBOL(irda_param_insert);
503
504
505
506
507
508
509
510
511static int irda_param_extract(void *self, __u8 *buf, int len,
512 pi_param_info_t *info)
513{
514 pi_minor_info_t *pi_minor_info;
515 __u8 pi_minor;
516 __u8 pi_major;
517 int type;
518 int ret = -1;
519 int n = 0;
520
521 IRDA_ASSERT(buf != NULL, return ret;);
522 IRDA_ASSERT(info != NULL, return ret;);
523
524 pi_minor = buf[n] & info->pi_mask;
525 pi_major = buf[n] >> info->pi_major_offset;
526
527
528 if ((pi_major > info->len-1) ||
529 (pi_minor > info->tables[pi_major].len-1))
530 {
531 IRDA_DEBUG(0, "%s(), no handler for parameter=0x%02x\n",
532 __func__, buf[0]);
533
534
535 return 2 + buf[n + 1];
536 }
537
538
539 pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor];
540
541
542 type = pi_minor_info->type;
543
544 IRDA_DEBUG(3, "%s(), pi=[%d,%d], type=%d\n", __func__,
545 pi_major, pi_minor, type);
546
547
548 if (!pi_minor_info->func) {
549 IRDA_MESSAGE("%s: no handler for pi=%#x\n",
550 __func__, buf[n]);
551
552 return 2 + buf[n + 1];
553 }
554
555
556 ret = (*pv_extract_table[type & PV_MASK])(self, buf+n, len, buf[n],
557 type, pi_minor_info->func);
558 return ret;
559}
560
561
562
563
564
565
566
567
568int irda_param_extract_all(void *self, __u8 *buf, int len,
569 pi_param_info_t *info)
570{
571 int ret = -1;
572 int n = 0;
573
574 IRDA_ASSERT(buf != NULL, return ret;);
575 IRDA_ASSERT(info != NULL, return ret;);
576
577
578
579
580
581 while (len > 2) {
582 ret = irda_param_extract(self, buf+n, len, info);
583 if (ret < 0)
584 return ret;
585
586 n += ret;
587 len -= ret;
588 }
589 return n;
590}
591EXPORT_SYMBOL(irda_param_extract_all);
592