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1 | /* | |
2 | * net/9p/protocol.c | |
3 | * | |
4 | * 9P Protocol Support Code | |
5 | * | |
6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * | |
8 | * Base on code from Anthony Liguori <aliguori@us.ibm.com> | |
9 | * Copyright (C) 2008 by IBM, Corp. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/uaccess.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/types.h> | |
36 | #include <linux/uio.h> | |
37 | #include <net/9p/9p.h> | |
38 | #include <net/9p/client.h> | |
39 | #include "protocol.h" | |
40 | ||
41 | #include <trace/events/9p.h> | |
42 | ||
43 | static int | |
44 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); | |
45 | ||
46 | void p9stat_free(struct p9_wstat *stbuf) | |
47 | { | |
48 | kfree(stbuf->name); | |
49 | stbuf->name = NULL; | |
50 | kfree(stbuf->uid); | |
51 | stbuf->uid = NULL; | |
52 | kfree(stbuf->gid); | |
53 | stbuf->gid = NULL; | |
54 | kfree(stbuf->muid); | |
55 | stbuf->muid = NULL; | |
56 | kfree(stbuf->extension); | |
57 | stbuf->extension = NULL; | |
58 | } | |
59 | EXPORT_SYMBOL(p9stat_free); | |
60 | ||
61 | size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) | |
62 | { | |
63 | size_t len = min(pdu->size - pdu->offset, size); | |
64 | memcpy(data, &pdu->sdata[pdu->offset], len); | |
65 | pdu->offset += len; | |
66 | return size - len; | |
67 | } | |
68 | ||
69 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) | |
70 | { | |
71 | size_t len = min(pdu->capacity - pdu->size, size); | |
72 | memcpy(&pdu->sdata[pdu->size], data, len); | |
73 | pdu->size += len; | |
74 | return size - len; | |
75 | } | |
76 | ||
77 | static size_t | |
78 | pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) | |
79 | { | |
80 | size_t len = min(pdu->capacity - pdu->size, size); | |
81 | struct iov_iter i = *from; | |
82 | if (copy_from_iter(&pdu->sdata[pdu->size], len, &i) != len) | |
83 | len = 0; | |
84 | ||
85 | pdu->size += len; | |
86 | return size - len; | |
87 | } | |
88 | ||
89 | /* | |
90 | b - int8_t | |
91 | w - int16_t | |
92 | d - int32_t | |
93 | q - int64_t | |
94 | s - string | |
95 | u - numeric uid | |
96 | g - numeric gid | |
97 | S - stat | |
98 | Q - qid | |
99 | D - data blob (int32_t size followed by void *, results are not freed) | |
100 | T - array of strings (int16_t count, followed by strings) | |
101 | R - array of qids (int16_t count, followed by qids) | |
102 | A - stat for 9p2000.L (p9_stat_dotl) | |
103 | ? - if optional = 1, continue parsing | |
104 | */ | |
105 | ||
106 | static int | |
107 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, | |
108 | va_list ap) | |
109 | { | |
110 | const char *ptr; | |
111 | int errcode = 0; | |
112 | ||
113 | for (ptr = fmt; *ptr; ptr++) { | |
114 | switch (*ptr) { | |
115 | case 'b':{ | |
116 | int8_t *val = va_arg(ap, int8_t *); | |
117 | if (pdu_read(pdu, val, sizeof(*val))) { | |
118 | errcode = -EFAULT; | |
119 | break; | |
120 | } | |
121 | } | |
122 | break; | |
123 | case 'w':{ | |
124 | int16_t *val = va_arg(ap, int16_t *); | |
125 | __le16 le_val; | |
126 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
127 | errcode = -EFAULT; | |
128 | break; | |
129 | } | |
130 | *val = le16_to_cpu(le_val); | |
131 | } | |
132 | break; | |
133 | case 'd':{ | |
134 | int32_t *val = va_arg(ap, int32_t *); | |
135 | __le32 le_val; | |
136 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
137 | errcode = -EFAULT; | |
138 | break; | |
139 | } | |
140 | *val = le32_to_cpu(le_val); | |
141 | } | |
142 | break; | |
143 | case 'q':{ | |
144 | int64_t *val = va_arg(ap, int64_t *); | |
145 | __le64 le_val; | |
146 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
147 | errcode = -EFAULT; | |
148 | break; | |
149 | } | |
150 | *val = le64_to_cpu(le_val); | |
151 | } | |
152 | break; | |
153 | case 's':{ | |
154 | char **sptr = va_arg(ap, char **); | |
155 | uint16_t len; | |
156 | ||
157 | errcode = p9pdu_readf(pdu, proto_version, | |
158 | "w", &len); | |
159 | if (errcode) | |
160 | break; | |
161 | ||
162 | *sptr = kmalloc(len + 1, GFP_NOFS); | |
163 | if (*sptr == NULL) { | |
164 | errcode = -EFAULT; | |
165 | break; | |
166 | } | |
167 | if (pdu_read(pdu, *sptr, len)) { | |
168 | errcode = -EFAULT; | |
169 | kfree(*sptr); | |
170 | *sptr = NULL; | |
171 | } else | |
172 | (*sptr)[len] = 0; | |
173 | } | |
174 | break; | |
175 | case 'u': { | |
176 | kuid_t *uid = va_arg(ap, kuid_t *); | |
177 | __le32 le_val; | |
178 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
179 | errcode = -EFAULT; | |
180 | break; | |
181 | } | |
182 | *uid = make_kuid(&init_user_ns, | |
183 | le32_to_cpu(le_val)); | |
184 | } break; | |
185 | case 'g': { | |
186 | kgid_t *gid = va_arg(ap, kgid_t *); | |
187 | __le32 le_val; | |
188 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
189 | errcode = -EFAULT; | |
190 | break; | |
191 | } | |
192 | *gid = make_kgid(&init_user_ns, | |
193 | le32_to_cpu(le_val)); | |
194 | } break; | |
195 | case 'Q':{ | |
196 | struct p9_qid *qid = | |
197 | va_arg(ap, struct p9_qid *); | |
198 | ||
199 | errcode = p9pdu_readf(pdu, proto_version, "bdq", | |
200 | &qid->type, &qid->version, | |
201 | &qid->path); | |
202 | } | |
203 | break; | |
204 | case 'S':{ | |
205 | struct p9_wstat *stbuf = | |
206 | va_arg(ap, struct p9_wstat *); | |
207 | ||
208 | memset(stbuf, 0, sizeof(struct p9_wstat)); | |
209 | stbuf->n_uid = stbuf->n_muid = INVALID_UID; | |
210 | stbuf->n_gid = INVALID_GID; | |
211 | ||
212 | errcode = | |
213 | p9pdu_readf(pdu, proto_version, | |
214 | "wwdQdddqssss?sugu", | |
215 | &stbuf->size, &stbuf->type, | |
216 | &stbuf->dev, &stbuf->qid, | |
217 | &stbuf->mode, &stbuf->atime, | |
218 | &stbuf->mtime, &stbuf->length, | |
219 | &stbuf->name, &stbuf->uid, | |
220 | &stbuf->gid, &stbuf->muid, | |
221 | &stbuf->extension, | |
222 | &stbuf->n_uid, &stbuf->n_gid, | |
223 | &stbuf->n_muid); | |
224 | if (errcode) | |
225 | p9stat_free(stbuf); | |
226 | } | |
227 | break; | |
228 | case 'D':{ | |
229 | uint32_t *count = va_arg(ap, uint32_t *); | |
230 | void **data = va_arg(ap, void **); | |
231 | ||
232 | errcode = | |
233 | p9pdu_readf(pdu, proto_version, "d", count); | |
234 | if (!errcode) { | |
235 | *count = | |
236 | min_t(uint32_t, *count, | |
237 | pdu->size - pdu->offset); | |
238 | *data = &pdu->sdata[pdu->offset]; | |
239 | } | |
240 | } | |
241 | break; | |
242 | case 'T':{ | |
243 | uint16_t *nwname = va_arg(ap, uint16_t *); | |
244 | char ***wnames = va_arg(ap, char ***); | |
245 | ||
246 | errcode = p9pdu_readf(pdu, proto_version, | |
247 | "w", nwname); | |
248 | if (!errcode) { | |
249 | *wnames = | |
250 | kmalloc(sizeof(char *) * *nwname, | |
251 | GFP_NOFS); | |
252 | if (!*wnames) | |
253 | errcode = -ENOMEM; | |
254 | } | |
255 | ||
256 | if (!errcode) { | |
257 | int i; | |
258 | ||
259 | for (i = 0; i < *nwname; i++) { | |
260 | errcode = | |
261 | p9pdu_readf(pdu, | |
262 | proto_version, | |
263 | "s", | |
264 | &(*wnames)[i]); | |
265 | if (errcode) | |
266 | break; | |
267 | } | |
268 | } | |
269 | ||
270 | if (errcode) { | |
271 | if (*wnames) { | |
272 | int i; | |
273 | ||
274 | for (i = 0; i < *nwname; i++) | |
275 | kfree((*wnames)[i]); | |
276 | } | |
277 | kfree(*wnames); | |
278 | *wnames = NULL; | |
279 | } | |
280 | } | |
281 | break; | |
282 | case 'R':{ | |
283 | uint16_t *nwqid = va_arg(ap, uint16_t *); | |
284 | struct p9_qid **wqids = | |
285 | va_arg(ap, struct p9_qid **); | |
286 | ||
287 | *wqids = NULL; | |
288 | ||
289 | errcode = | |
290 | p9pdu_readf(pdu, proto_version, "w", nwqid); | |
291 | if (!errcode) { | |
292 | *wqids = | |
293 | kmalloc(*nwqid * | |
294 | sizeof(struct p9_qid), | |
295 | GFP_NOFS); | |
296 | if (*wqids == NULL) | |
297 | errcode = -ENOMEM; | |
298 | } | |
299 | ||
300 | if (!errcode) { | |
301 | int i; | |
302 | ||
303 | for (i = 0; i < *nwqid; i++) { | |
304 | errcode = | |
305 | p9pdu_readf(pdu, | |
306 | proto_version, | |
307 | "Q", | |
308 | &(*wqids)[i]); | |
309 | if (errcode) | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | if (errcode) { | |
315 | kfree(*wqids); | |
316 | *wqids = NULL; | |
317 | } | |
318 | } | |
319 | break; | |
320 | case 'A': { | |
321 | struct p9_stat_dotl *stbuf = | |
322 | va_arg(ap, struct p9_stat_dotl *); | |
323 | ||
324 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
325 | errcode = | |
326 | p9pdu_readf(pdu, proto_version, | |
327 | "qQdugqqqqqqqqqqqqqqq", | |
328 | &stbuf->st_result_mask, | |
329 | &stbuf->qid, | |
330 | &stbuf->st_mode, | |
331 | &stbuf->st_uid, &stbuf->st_gid, | |
332 | &stbuf->st_nlink, | |
333 | &stbuf->st_rdev, &stbuf->st_size, | |
334 | &stbuf->st_blksize, &stbuf->st_blocks, | |
335 | &stbuf->st_atime_sec, | |
336 | &stbuf->st_atime_nsec, | |
337 | &stbuf->st_mtime_sec, | |
338 | &stbuf->st_mtime_nsec, | |
339 | &stbuf->st_ctime_sec, | |
340 | &stbuf->st_ctime_nsec, | |
341 | &stbuf->st_btime_sec, | |
342 | &stbuf->st_btime_nsec, | |
343 | &stbuf->st_gen, | |
344 | &stbuf->st_data_version); | |
345 | } | |
346 | break; | |
347 | case '?': | |
348 | if ((proto_version != p9_proto_2000u) && | |
349 | (proto_version != p9_proto_2000L)) | |
350 | return 0; | |
351 | break; | |
352 | default: | |
353 | BUG(); | |
354 | break; | |
355 | } | |
356 | ||
357 | if (errcode) | |
358 | break; | |
359 | } | |
360 | ||
361 | return errcode; | |
362 | } | |
363 | ||
364 | int | |
365 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, | |
366 | va_list ap) | |
367 | { | |
368 | const char *ptr; | |
369 | int errcode = 0; | |
370 | ||
371 | for (ptr = fmt; *ptr; ptr++) { | |
372 | switch (*ptr) { | |
373 | case 'b':{ | |
374 | int8_t val = va_arg(ap, int); | |
375 | if (pdu_write(pdu, &val, sizeof(val))) | |
376 | errcode = -EFAULT; | |
377 | } | |
378 | break; | |
379 | case 'w':{ | |
380 | __le16 val = cpu_to_le16(va_arg(ap, int)); | |
381 | if (pdu_write(pdu, &val, sizeof(val))) | |
382 | errcode = -EFAULT; | |
383 | } | |
384 | break; | |
385 | case 'd':{ | |
386 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); | |
387 | if (pdu_write(pdu, &val, sizeof(val))) | |
388 | errcode = -EFAULT; | |
389 | } | |
390 | break; | |
391 | case 'q':{ | |
392 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); | |
393 | if (pdu_write(pdu, &val, sizeof(val))) | |
394 | errcode = -EFAULT; | |
395 | } | |
396 | break; | |
397 | case 's':{ | |
398 | const char *sptr = va_arg(ap, const char *); | |
399 | uint16_t len = 0; | |
400 | if (sptr) | |
401 | len = min_t(size_t, strlen(sptr), | |
402 | USHRT_MAX); | |
403 | ||
404 | errcode = p9pdu_writef(pdu, proto_version, | |
405 | "w", len); | |
406 | if (!errcode && pdu_write(pdu, sptr, len)) | |
407 | errcode = -EFAULT; | |
408 | } | |
409 | break; | |
410 | case 'u': { | |
411 | kuid_t uid = va_arg(ap, kuid_t); | |
412 | __le32 val = cpu_to_le32( | |
413 | from_kuid(&init_user_ns, uid)); | |
414 | if (pdu_write(pdu, &val, sizeof(val))) | |
415 | errcode = -EFAULT; | |
416 | } break; | |
417 | case 'g': { | |
418 | kgid_t gid = va_arg(ap, kgid_t); | |
419 | __le32 val = cpu_to_le32( | |
420 | from_kgid(&init_user_ns, gid)); | |
421 | if (pdu_write(pdu, &val, sizeof(val))) | |
422 | errcode = -EFAULT; | |
423 | } break; | |
424 | case 'Q':{ | |
425 | const struct p9_qid *qid = | |
426 | va_arg(ap, const struct p9_qid *); | |
427 | errcode = | |
428 | p9pdu_writef(pdu, proto_version, "bdq", | |
429 | qid->type, qid->version, | |
430 | qid->path); | |
431 | } break; | |
432 | case 'S':{ | |
433 | const struct p9_wstat *stbuf = | |
434 | va_arg(ap, const struct p9_wstat *); | |
435 | errcode = | |
436 | p9pdu_writef(pdu, proto_version, | |
437 | "wwdQdddqssss?sugu", | |
438 | stbuf->size, stbuf->type, | |
439 | stbuf->dev, &stbuf->qid, | |
440 | stbuf->mode, stbuf->atime, | |
441 | stbuf->mtime, stbuf->length, | |
442 | stbuf->name, stbuf->uid, | |
443 | stbuf->gid, stbuf->muid, | |
444 | stbuf->extension, stbuf->n_uid, | |
445 | stbuf->n_gid, stbuf->n_muid); | |
446 | } break; | |
447 | case 'V':{ | |
448 | uint32_t count = va_arg(ap, uint32_t); | |
449 | struct iov_iter *from = | |
450 | va_arg(ap, struct iov_iter *); | |
451 | errcode = p9pdu_writef(pdu, proto_version, "d", | |
452 | count); | |
453 | if (!errcode && pdu_write_u(pdu, from, count)) | |
454 | errcode = -EFAULT; | |
455 | } | |
456 | break; | |
457 | case 'T':{ | |
458 | uint16_t nwname = va_arg(ap, int); | |
459 | const char **wnames = va_arg(ap, const char **); | |
460 | ||
461 | errcode = p9pdu_writef(pdu, proto_version, "w", | |
462 | nwname); | |
463 | if (!errcode) { | |
464 | int i; | |
465 | ||
466 | for (i = 0; i < nwname; i++) { | |
467 | errcode = | |
468 | p9pdu_writef(pdu, | |
469 | proto_version, | |
470 | "s", | |
471 | wnames[i]); | |
472 | if (errcode) | |
473 | break; | |
474 | } | |
475 | } | |
476 | } | |
477 | break; | |
478 | case 'R':{ | |
479 | uint16_t nwqid = va_arg(ap, int); | |
480 | struct p9_qid *wqids = | |
481 | va_arg(ap, struct p9_qid *); | |
482 | ||
483 | errcode = p9pdu_writef(pdu, proto_version, "w", | |
484 | nwqid); | |
485 | if (!errcode) { | |
486 | int i; | |
487 | ||
488 | for (i = 0; i < nwqid; i++) { | |
489 | errcode = | |
490 | p9pdu_writef(pdu, | |
491 | proto_version, | |
492 | "Q", | |
493 | &wqids[i]); | |
494 | if (errcode) | |
495 | break; | |
496 | } | |
497 | } | |
498 | } | |
499 | break; | |
500 | case 'I':{ | |
501 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
502 | struct p9_iattr_dotl *); | |
503 | ||
504 | errcode = p9pdu_writef(pdu, proto_version, | |
505 | "ddugqqqqq", | |
506 | p9attr->valid, | |
507 | p9attr->mode, | |
508 | p9attr->uid, | |
509 | p9attr->gid, | |
510 | p9attr->size, | |
511 | p9attr->atime_sec, | |
512 | p9attr->atime_nsec, | |
513 | p9attr->mtime_sec, | |
514 | p9attr->mtime_nsec); | |
515 | } | |
516 | break; | |
517 | case '?': | |
518 | if ((proto_version != p9_proto_2000u) && | |
519 | (proto_version != p9_proto_2000L)) | |
520 | return 0; | |
521 | break; | |
522 | default: | |
523 | BUG(); | |
524 | break; | |
525 | } | |
526 | ||
527 | if (errcode) | |
528 | break; | |
529 | } | |
530 | ||
531 | return errcode; | |
532 | } | |
533 | ||
534 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) | |
535 | { | |
536 | va_list ap; | |
537 | int ret; | |
538 | ||
539 | va_start(ap, fmt); | |
540 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); | |
541 | va_end(ap); | |
542 | ||
543 | return ret; | |
544 | } | |
545 | ||
546 | static int | |
547 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) | |
548 | { | |
549 | va_list ap; | |
550 | int ret; | |
551 | ||
552 | va_start(ap, fmt); | |
553 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); | |
554 | va_end(ap); | |
555 | ||
556 | return ret; | |
557 | } | |
558 | ||
559 | int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) | |
560 | { | |
561 | struct p9_fcall fake_pdu; | |
562 | int ret; | |
563 | ||
564 | fake_pdu.size = len; | |
565 | fake_pdu.capacity = len; | |
566 | fake_pdu.sdata = buf; | |
567 | fake_pdu.offset = 0; | |
568 | ||
569 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); | |
570 | if (ret) { | |
571 | p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
572 | trace_9p_protocol_dump(clnt, &fake_pdu); | |
573 | return ret; | |
574 | } | |
575 | ||
576 | return fake_pdu.offset; | |
577 | } | |
578 | EXPORT_SYMBOL(p9stat_read); | |
579 | ||
580 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) | |
581 | { | |
582 | pdu->id = type; | |
583 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); | |
584 | } | |
585 | ||
586 | int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) | |
587 | { | |
588 | int size = pdu->size; | |
589 | int err; | |
590 | ||
591 | pdu->size = 0; | |
592 | err = p9pdu_writef(pdu, 0, "d", size); | |
593 | pdu->size = size; | |
594 | ||
595 | trace_9p_protocol_dump(clnt, pdu); | |
596 | p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", | |
597 | pdu->size, pdu->id, pdu->tag); | |
598 | ||
599 | return err; | |
600 | } | |
601 | ||
602 | void p9pdu_reset(struct p9_fcall *pdu) | |
603 | { | |
604 | pdu->offset = 0; | |
605 | pdu->size = 0; | |
606 | } | |
607 | ||
608 | int p9dirent_read(struct p9_client *clnt, char *buf, int len, | |
609 | struct p9_dirent *dirent) | |
610 | { | |
611 | struct p9_fcall fake_pdu; | |
612 | int ret; | |
613 | char *nameptr; | |
614 | ||
615 | fake_pdu.size = len; | |
616 | fake_pdu.capacity = len; | |
617 | fake_pdu.sdata = buf; | |
618 | fake_pdu.offset = 0; | |
619 | ||
620 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, | |
621 | &dirent->d_off, &dirent->d_type, &nameptr); | |
622 | if (ret) { | |
623 | p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
624 | trace_9p_protocol_dump(clnt, &fake_pdu); | |
625 | goto out; | |
626 | } | |
627 | ||
628 | strcpy(dirent->d_name, nameptr); | |
629 | kfree(nameptr); | |
630 | ||
631 | out: | |
632 | return fake_pdu.offset; | |
633 | } | |
634 | EXPORT_SYMBOL(p9dirent_read); |