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1da177e4 LT |
1 | /********************************************************************* |
2 | * | |
3 | * Filename: parameters.c | |
4 | * Version: 1.0 | |
5 | * Description: A more general way to handle (pi,pl,pv) parameters | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dagb@cs.uit.no> | |
8 | * Created at: Mon Jun 7 10:25:11 1999 | |
9 | * Modified at: Sun Jan 30 14:08:39 2000 | |
10 | * Modified by: Dag Brattli <dagb@cs.uit.no> | |
11 | * | |
12 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
d3770509 | 25 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
1da177e4 LT |
26 | * |
27 | ********************************************************************/ | |
28 | ||
29 | #include <linux/types.h> | |
30 | #include <linux/module.h> | |
31 | ||
32 | #include <asm/unaligned.h> | |
33 | #include <asm/byteorder.h> | |
34 | ||
35 | #include <net/irda/irda.h> | |
36 | #include <net/irda/parameters.h> | |
37 | ||
38 | static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi, | |
39 | PV_TYPE type, PI_HANDLER func); | |
40 | static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi, | |
41 | PV_TYPE type, PI_HANDLER func); | |
42 | static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi, | |
43 | PV_TYPE type, PI_HANDLER func); | |
44 | static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
45 | PV_TYPE type, PI_HANDLER func); | |
46 | ||
47 | static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi, | |
48 | PV_TYPE type, PI_HANDLER func); | |
49 | static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
50 | PV_TYPE type, PI_HANDLER func); | |
51 | ||
52 | static int irda_param_unpack(__u8 *buf, char *fmt, ...); | |
53 | ||
54 | /* Parameter value call table. Must match PV_TYPE */ | |
785c20a0 | 55 | static const PV_HANDLER pv_extract_table[] = { |
1da177e4 LT |
56 | irda_extract_integer, /* Handler for any length integers */ |
57 | irda_extract_integer, /* Handler for 8 bits integers */ | |
58 | irda_extract_integer, /* Handler for 16 bits integers */ | |
59 | irda_extract_string, /* Handler for strings */ | |
60 | irda_extract_integer, /* Handler for 32 bits integers */ | |
61 | irda_extract_octseq, /* Handler for octet sequences */ | |
62 | irda_extract_no_value /* Handler for no value parameters */ | |
63 | }; | |
64 | ||
785c20a0 | 65 | static const PV_HANDLER pv_insert_table[] = { |
1da177e4 LT |
66 | irda_insert_integer, /* Handler for any length integers */ |
67 | irda_insert_integer, /* Handler for 8 bits integers */ | |
68 | irda_insert_integer, /* Handler for 16 bits integers */ | |
69 | NULL, /* Handler for strings */ | |
70 | irda_insert_integer, /* Handler for 32 bits integers */ | |
71 | NULL, /* Handler for octet sequences */ | |
72 | irda_insert_no_value /* Handler for no value parameters */ | |
73 | }; | |
74 | ||
75 | /* | |
76 | * Function irda_insert_no_value (self, buf, len, pi, type, func) | |
77 | */ | |
78 | static int irda_insert_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
79 | PV_TYPE type, PI_HANDLER func) | |
80 | { | |
81 | irda_param_t p; | |
82 | int ret; | |
83 | ||
84 | p.pi = pi; | |
85 | p.pl = 0; | |
86 | ||
87 | /* Call handler for this parameter */ | |
88 | ret = (*func)(self, &p, PV_GET); | |
89 | ||
90 | /* Extract values anyway, since handler may need them */ | |
91 | irda_param_pack(buf, "bb", p.pi, p.pl); | |
92 | ||
93 | if (ret < 0) | |
94 | return ret; | |
95 | ||
96 | return 2; /* Inserted pl+2 bytes */ | |
97 | } | |
98 | ||
99 | /* | |
100 | * Function irda_extract_no_value (self, buf, len, type, func) | |
101 | * | |
102 | * Extracts a parameter without a pv field (pl=0) | |
103 | * | |
104 | */ | |
105 | static int irda_extract_no_value(void *self, __u8 *buf, int len, __u8 pi, | |
106 | PV_TYPE type, PI_HANDLER func) | |
107 | { | |
108 | irda_param_t p; | |
109 | int ret; | |
110 | ||
111 | /* Extract values anyway, since handler may need them */ | |
112 | irda_param_unpack(buf, "bb", &p.pi, &p.pl); | |
113 | ||
114 | /* Call handler for this parameter */ | |
115 | ret = (*func)(self, &p, PV_PUT); | |
116 | ||
117 | if (ret < 0) | |
118 | return ret; | |
119 | ||
120 | return 2; /* Extracted pl+2 bytes */ | |
121 | } | |
122 | ||
123 | /* | |
124 | * Function irda_insert_integer (self, buf, len, pi, type, func) | |
125 | */ | |
126 | static int irda_insert_integer(void *self, __u8 *buf, int len, __u8 pi, | |
127 | PV_TYPE type, PI_HANDLER func) | |
128 | { | |
129 | irda_param_t p; | |
130 | int n = 0; | |
131 | int err; | |
132 | ||
133 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 134 | p.pl = type & PV_MASK; /* The integer type codes the length as well */ |
1da177e4 LT |
135 | p.pv.i = 0; /* Clear value */ |
136 | ||
137 | /* Call handler for this parameter */ | |
138 | err = (*func)(self, &p, PV_GET); | |
139 | if (err < 0) | |
140 | return err; | |
141 | ||
142 | /* | |
cc53ded2 | 143 | * If parameter length is still 0, then (1) this is an any length |
1da177e4 LT |
144 | * integer, and (2) the handler function does not care which length |
145 | * we choose to use, so we pick the one the gives the fewest bytes. | |
146 | */ | |
147 | if (p.pl == 0) { | |
148 | if (p.pv.i < 0xff) { | |
955a9d20 | 149 | pr_debug("%s(), using 1 byte\n", __func__); |
1da177e4 LT |
150 | p.pl = 1; |
151 | } else if (p.pv.i < 0xffff) { | |
955a9d20 | 152 | pr_debug("%s(), using 2 bytes\n", __func__); |
1da177e4 LT |
153 | p.pl = 2; |
154 | } else { | |
955a9d20 | 155 | pr_debug("%s(), using 4 bytes\n", __func__); |
1da177e4 LT |
156 | p.pl = 4; /* Default length */ |
157 | } | |
158 | } | |
159 | /* Check if buffer is long enough for insertion */ | |
160 | if (len < (2+p.pl)) { | |
6c91023d JP |
161 | net_warn_ratelimited("%s: buffer too short for insertion!\n", |
162 | __func__); | |
1da177e4 LT |
163 | return -1; |
164 | } | |
955a9d20 JP |
165 | pr_debug("%s(), pi=%#x, pl=%d, pi=%d\n", __func__, |
166 | p.pi, p.pl, p.pv.i); | |
1da177e4 LT |
167 | switch (p.pl) { |
168 | case 1: | |
169 | n += irda_param_pack(buf, "bbb", p.pi, p.pl, (__u8) p.pv.i); | |
170 | break; | |
171 | case 2: | |
172 | if (type & PV_BIG_ENDIAN) | |
173 | p.pv.i = cpu_to_be16((__u16) p.pv.i); | |
174 | else | |
175 | p.pv.i = cpu_to_le16((__u16) p.pv.i); | |
176 | n += irda_param_pack(buf, "bbs", p.pi, p.pl, (__u16) p.pv.i); | |
177 | break; | |
178 | case 4: | |
179 | if (type & PV_BIG_ENDIAN) | |
180 | cpu_to_be32s(&p.pv.i); | |
181 | else | |
182 | cpu_to_le32s(&p.pv.i); | |
183 | n += irda_param_pack(buf, "bbi", p.pi, p.pl, p.pv.i); | |
184 | ||
185 | break; | |
186 | default: | |
6c91023d JP |
187 | net_warn_ratelimited("%s: length %d not supported\n", |
188 | __func__, p.pl); | |
1da177e4 LT |
189 | /* Skip parameter */ |
190 | return -1; | |
191 | } | |
192 | ||
193 | return p.pl+2; /* Inserted pl+2 bytes */ | |
194 | } | |
195 | ||
196 | /* | |
197 | * Function irda_extract integer (self, buf, len, pi, type, func) | |
198 | * | |
199 | * Extract a possibly variable length integer from buffer, and call | |
200 | * handler for processing of the parameter | |
201 | */ | |
202 | static int irda_extract_integer(void *self, __u8 *buf, int len, __u8 pi, | |
203 | PV_TYPE type, PI_HANDLER func) | |
204 | { | |
205 | irda_param_t p; | |
206 | int n = 0; | |
cc53ded2 | 207 | int extract_len; /* Real length we extract */ |
1da177e4 LT |
208 | int err; |
209 | ||
210 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 211 | p.pl = buf[1]; /* Extract length of value */ |
1da177e4 LT |
212 | p.pv.i = 0; /* Clear value */ |
213 | extract_len = p.pl; /* Default : extract all */ | |
214 | ||
215 | /* Check if buffer is long enough for parsing */ | |
216 | if (len < (2+p.pl)) { | |
6c91023d JP |
217 | net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", |
218 | __func__, p.pl, len); | |
1da177e4 LT |
219 | return -1; |
220 | } | |
221 | ||
222 | /* | |
223 | * Check that the integer length is what we expect it to be. If the | |
224 | * handler want a 16 bits integer then a 32 bits is not good enough | |
225 | * PV_INTEGER means that the handler is flexible. | |
226 | */ | |
227 | if (((type & PV_MASK) != PV_INTEGER) && ((type & PV_MASK) != p.pl)) { | |
6c91023d JP |
228 | net_err_ratelimited("%s: invalid parameter length! Expected %d bytes, but value had %d bytes!\n", |
229 | __func__, type & PV_MASK, p.pl); | |
1da177e4 LT |
230 | |
231 | /* Most parameters are bit/byte fields or little endian, | |
232 | * so it's ok to only extract a subset of it (the subset | |
233 | * that the handler expect). This is necessary, as some | |
234 | * broken implementations seems to add extra undefined bits. | |
235 | * If the parameter is shorter than we expect or is big | |
236 | * endian, we can't play those tricks. Jean II */ | |
237 | if((p.pl < (type & PV_MASK)) || (type & PV_BIG_ENDIAN)) { | |
238 | /* Skip parameter */ | |
239 | return p.pl+2; | |
240 | } else { | |
241 | /* Extract subset of it, fallthrough */ | |
242 | extract_len = type & PV_MASK; | |
243 | } | |
244 | } | |
245 | ||
246 | ||
247 | switch (extract_len) { | |
248 | case 1: | |
249 | n += irda_param_unpack(buf+2, "b", &p.pv.i); | |
250 | break; | |
251 | case 2: | |
252 | n += irda_param_unpack(buf+2, "s", &p.pv.i); | |
253 | if (type & PV_BIG_ENDIAN) | |
254 | p.pv.i = be16_to_cpu((__u16) p.pv.i); | |
255 | else | |
256 | p.pv.i = le16_to_cpu((__u16) p.pv.i); | |
257 | break; | |
258 | case 4: | |
259 | n += irda_param_unpack(buf+2, "i", &p.pv.i); | |
260 | if (type & PV_BIG_ENDIAN) | |
261 | be32_to_cpus(&p.pv.i); | |
262 | else | |
263 | le32_to_cpus(&p.pv.i); | |
264 | break; | |
265 | default: | |
6c91023d JP |
266 | net_warn_ratelimited("%s: length %d not supported\n", |
267 | __func__, p.pl); | |
1da177e4 LT |
268 | |
269 | /* Skip parameter */ | |
270 | return p.pl+2; | |
271 | } | |
272 | ||
955a9d20 JP |
273 | pr_debug("%s(), pi=%#x, pl=%d, pi=%d\n", __func__, |
274 | p.pi, p.pl, p.pv.i); | |
1da177e4 LT |
275 | /* Call handler for this parameter */ |
276 | err = (*func)(self, &p, PV_PUT); | |
277 | if (err < 0) | |
278 | return err; | |
279 | ||
280 | return p.pl+2; /* Extracted pl+2 bytes */ | |
281 | } | |
282 | ||
283 | /* | |
284 | * Function irda_extract_string (self, buf, len, type, func) | |
285 | */ | |
286 | static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi, | |
287 | PV_TYPE type, PI_HANDLER func) | |
288 | { | |
289 | char str[33]; | |
290 | irda_param_t p; | |
291 | int err; | |
292 | ||
1da177e4 | 293 | p.pi = pi; /* In case handler needs to know */ |
cc53ded2 | 294 | p.pl = buf[1]; /* Extract length of value */ |
efc463eb SO |
295 | if (p.pl > 32) |
296 | p.pl = 32; | |
1da177e4 | 297 | |
955a9d20 JP |
298 | pr_debug("%s(), pi=%#x, pl=%d\n", __func__, |
299 | p.pi, p.pl); | |
1da177e4 LT |
300 | |
301 | /* Check if buffer is long enough for parsing */ | |
302 | if (len < (2+p.pl)) { | |
6c91023d JP |
303 | net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", |
304 | __func__, p.pl, len); | |
1da177e4 LT |
305 | return -1; |
306 | } | |
307 | ||
308 | /* Should be safe to copy string like this since we have already | |
309 | * checked that the buffer is long enough */ | |
310 | strncpy(str, buf+2, p.pl); | |
311 | ||
955a9d20 JP |
312 | pr_debug("%s(), str=0x%02x 0x%02x\n", |
313 | __func__, (__u8)str[0], (__u8)str[1]); | |
1da177e4 LT |
314 | |
315 | /* Null terminate string */ | |
efc463eb | 316 | str[p.pl] = '\0'; |
1da177e4 LT |
317 | |
318 | p.pv.c = str; /* Handler will need to take a copy */ | |
319 | ||
320 | /* Call handler for this parameter */ | |
321 | err = (*func)(self, &p, PV_PUT); | |
322 | if (err < 0) | |
323 | return err; | |
324 | ||
325 | return p.pl+2; /* Extracted pl+2 bytes */ | |
326 | } | |
327 | ||
328 | /* | |
329 | * Function irda_extract_octseq (self, buf, len, type, func) | |
330 | */ | |
331 | static int irda_extract_octseq(void *self, __u8 *buf, int len, __u8 pi, | |
332 | PV_TYPE type, PI_HANDLER func) | |
333 | { | |
334 | irda_param_t p; | |
335 | ||
336 | p.pi = pi; /* In case handler needs to know */ | |
cc53ded2 | 337 | p.pl = buf[1]; /* Extract length of value */ |
1da177e4 LT |
338 | |
339 | /* Check if buffer is long enough for parsing */ | |
340 | if (len < (2+p.pl)) { | |
6c91023d JP |
341 | net_warn_ratelimited("%s: buffer too short for parsing! Need %d bytes, but len is only %d\n", |
342 | __func__, p.pl, len); | |
1da177e4 LT |
343 | return -1; |
344 | } | |
345 | ||
955a9d20 | 346 | pr_debug("%s(), not impl\n", __func__); |
1da177e4 LT |
347 | |
348 | return p.pl+2; /* Extracted pl+2 bytes */ | |
349 | } | |
350 | ||
351 | /* | |
352 | * Function irda_param_pack (skb, fmt, ...) | |
353 | * | |
354 | * Format: | |
355 | * 'i' = 32 bits integer | |
356 | * 's' = string | |
357 | * | |
358 | */ | |
359 | int irda_param_pack(__u8 *buf, char *fmt, ...) | |
360 | { | |
361 | irda_pv_t arg; | |
362 | va_list args; | |
363 | char *p; | |
364 | int n = 0; | |
365 | ||
366 | va_start(args, fmt); | |
367 | ||
368 | for (p = fmt; *p != '\0'; p++) { | |
369 | switch (*p) { | |
370 | case 'b': /* 8 bits unsigned byte */ | |
371 | buf[n++] = (__u8)va_arg(args, int); | |
372 | break; | |
373 | case 's': /* 16 bits unsigned short */ | |
374 | arg.i = (__u16)va_arg(args, int); | |
375 | put_unaligned((__u16)arg.i, (__u16 *)(buf+n)); n+=2; | |
376 | break; | |
377 | case 'i': /* 32 bits unsigned integer */ | |
378 | arg.i = va_arg(args, __u32); | |
379 | put_unaligned(arg.i, (__u32 *)(buf+n)); n+=4; | |
380 | break; | |
381 | #if 0 | |
382 | case 'c': /* \0 terminated string */ | |
383 | arg.c = va_arg(args, char *); | |
384 | strcpy(buf+n, arg.c); | |
385 | n += strlen(arg.c) + 1; | |
386 | break; | |
387 | #endif | |
388 | default: | |
389 | va_end(args); | |
390 | return -1; | |
391 | } | |
392 | } | |
393 | va_end(args); | |
394 | ||
395 | return 0; | |
396 | } | |
397 | EXPORT_SYMBOL(irda_param_pack); | |
398 | ||
399 | /* | |
400 | * Function irda_param_unpack (skb, fmt, ...) | |
401 | */ | |
402 | static int irda_param_unpack(__u8 *buf, char *fmt, ...) | |
403 | { | |
404 | irda_pv_t arg; | |
405 | va_list args; | |
406 | char *p; | |
407 | int n = 0; | |
408 | ||
409 | va_start(args, fmt); | |
410 | ||
411 | for (p = fmt; *p != '\0'; p++) { | |
412 | switch (*p) { | |
413 | case 'b': /* 8 bits byte */ | |
414 | arg.ip = va_arg(args, __u32 *); | |
415 | *arg.ip = buf[n++]; | |
416 | break; | |
417 | case 's': /* 16 bits short */ | |
418 | arg.ip = va_arg(args, __u32 *); | |
419 | *arg.ip = get_unaligned((__u16 *)(buf+n)); n+=2; | |
420 | break; | |
421 | case 'i': /* 32 bits unsigned integer */ | |
422 | arg.ip = va_arg(args, __u32 *); | |
423 | *arg.ip = get_unaligned((__u32 *)(buf+n)); n+=4; | |
424 | break; | |
425 | #if 0 | |
426 | case 'c': /* \0 terminated string */ | |
427 | arg.c = va_arg(args, char *); | |
428 | strcpy(arg.c, buf+n); | |
429 | n += strlen(arg.c) + 1; | |
430 | break; | |
431 | #endif | |
432 | default: | |
433 | va_end(args); | |
434 | return -1; | |
435 | } | |
436 | ||
437 | } | |
438 | va_end(args); | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Function irda_param_insert (self, pi, buf, len, info) | |
445 | * | |
446 | * Insert the specified parameter (pi) into buffer. Returns number of | |
447 | * bytes inserted | |
448 | */ | |
449 | int irda_param_insert(void *self, __u8 pi, __u8 *buf, int len, | |
450 | pi_param_info_t *info) | |
451 | { | |
785c20a0 | 452 | const pi_minor_info_t *pi_minor_info; |
1da177e4 LT |
453 | __u8 pi_minor; |
454 | __u8 pi_major; | |
455 | int type; | |
456 | int ret = -1; | |
457 | int n = 0; | |
458 | ||
459 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 460 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
461 | |
462 | pi_minor = pi & info->pi_mask; | |
463 | pi_major = pi >> info->pi_major_offset; | |
464 | ||
465 | /* Check if the identifier value (pi) is valid */ | |
466 | if ((pi_major > info->len-1) || | |
467 | (pi_minor > info->tables[pi_major].len-1)) | |
468 | { | |
955a9d20 JP |
469 | pr_debug("%s(), no handler for parameter=0x%02x\n", |
470 | __func__, pi); | |
1da177e4 LT |
471 | |
472 | /* Skip this parameter */ | |
473 | return -1; | |
474 | } | |
475 | ||
476 | /* Lookup the info on how to parse this parameter */ | |
477 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
478 | ||
479 | /* Find expected data type for this parameter identifier (pi)*/ | |
480 | type = pi_minor_info->type; | |
481 | ||
482 | /* Check if handler has been implemented */ | |
483 | if (!pi_minor_info->func) { | |
6c91023d JP |
484 | net_info_ratelimited("%s: no handler for pi=%#x\n", |
485 | __func__, pi); | |
1da177e4 LT |
486 | /* Skip this parameter */ |
487 | return -1; | |
488 | } | |
489 | ||
490 | /* Insert parameter value */ | |
491 | ret = (*pv_insert_table[type & PV_MASK])(self, buf+n, len, pi, type, | |
492 | pi_minor_info->func); | |
493 | return ret; | |
494 | } | |
495 | EXPORT_SYMBOL(irda_param_insert); | |
496 | ||
497 | /* | |
498 | * Function irda_param_extract (self, buf, len, info) | |
499 | * | |
500 | * Parse all parameters. If len is correct, then everything should be | |
501 | * safe. Returns the number of bytes that was parsed | |
502 | * | |
503 | */ | |
504 | static int irda_param_extract(void *self, __u8 *buf, int len, | |
505 | pi_param_info_t *info) | |
506 | { | |
785c20a0 | 507 | const pi_minor_info_t *pi_minor_info; |
1da177e4 LT |
508 | __u8 pi_minor; |
509 | __u8 pi_major; | |
510 | int type; | |
511 | int ret = -1; | |
512 | int n = 0; | |
513 | ||
514 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 515 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
516 | |
517 | pi_minor = buf[n] & info->pi_mask; | |
518 | pi_major = buf[n] >> info->pi_major_offset; | |
519 | ||
520 | /* Check if the identifier value (pi) is valid */ | |
521 | if ((pi_major > info->len-1) || | |
522 | (pi_minor > info->tables[pi_major].len-1)) | |
523 | { | |
955a9d20 JP |
524 | pr_debug("%s(), no handler for parameter=0x%02x\n", |
525 | __func__, buf[0]); | |
1da177e4 LT |
526 | |
527 | /* Skip this parameter */ | |
528 | return 2 + buf[n + 1]; /* Continue */ | |
529 | } | |
530 | ||
531 | /* Lookup the info on how to parse this parameter */ | |
532 | pi_minor_info = &info->tables[pi_major].pi_minor_call_table[pi_minor]; | |
533 | ||
534 | /* Find expected data type for this parameter identifier (pi)*/ | |
535 | type = pi_minor_info->type; | |
536 | ||
955a9d20 JP |
537 | pr_debug("%s(), pi=[%d,%d], type=%d\n", __func__, |
538 | pi_major, pi_minor, type); | |
1da177e4 LT |
539 | |
540 | /* Check if handler has been implemented */ | |
541 | if (!pi_minor_info->func) { | |
6c91023d JP |
542 | net_info_ratelimited("%s: no handler for pi=%#x\n", |
543 | __func__, buf[n]); | |
1da177e4 LT |
544 | /* Skip this parameter */ |
545 | return 2 + buf[n + 1]; /* Continue */ | |
546 | } | |
547 | ||
548 | /* Parse parameter value */ | |
549 | ret = (*pv_extract_table[type & PV_MASK])(self, buf+n, len, buf[n], | |
550 | type, pi_minor_info->func); | |
551 | return ret; | |
552 | } | |
553 | ||
554 | /* | |
555 | * Function irda_param_extract_all (self, buf, len, info) | |
556 | * | |
557 | * Parse all parameters. If len is correct, then everything should be | |
558 | * safe. Returns the number of bytes that was parsed | |
559 | * | |
560 | */ | |
6819bc2e | 561 | int irda_param_extract_all(void *self, __u8 *buf, int len, |
1da177e4 LT |
562 | pi_param_info_t *info) |
563 | { | |
564 | int ret = -1; | |
565 | int n = 0; | |
566 | ||
567 | IRDA_ASSERT(buf != NULL, return ret;); | |
a26e01d7 | 568 | IRDA_ASSERT(info != NULL, return ret;); |
1da177e4 LT |
569 | |
570 | /* | |
571 | * Parse all parameters. Each parameter must be at least two bytes | |
572 | * long or else there is no point in trying to parse it | |
573 | */ | |
574 | while (len > 2) { | |
575 | ret = irda_param_extract(self, buf+n, len, info); | |
576 | if (ret < 0) | |
577 | return ret; | |
578 | ||
579 | n += ret; | |
580 | len -= ret; | |
581 | } | |
582 | return n; | |
583 | } | |
584 | EXPORT_SYMBOL(irda_param_extract_all); |