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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 <net/9p/9p.h>
37#include <net/9p/client.h>
38#include "protocol.h"
39
40static int
41p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
42
43#ifdef CONFIG_NET_9P_DEBUG
44void
45p9pdu_dump(int way, struct p9_fcall *pdu)
46{
47 int len = pdu->size;
48
49 if ((p9_debug_level & P9_DEBUG_VPKT) != P9_DEBUG_VPKT) {
50 if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) {
51 if (len > 32)
52 len = 32;
53 } else {
54 /* shouldn't happen */
55 return;
56 }
57 }
58
59 if (way)
60 print_hex_dump_bytes("[9P] ", DUMP_PREFIX_OFFSET, pdu->sdata,
61 len);
62 else
63 print_hex_dump_bytes("]9P[ ", DUMP_PREFIX_OFFSET, pdu->sdata,
64 len);
65}
66#else
67void
68p9pdu_dump(int way, struct p9_fcall *pdu)
69{
70}
71#endif
72EXPORT_SYMBOL(p9pdu_dump);
73
74void p9stat_free(struct p9_wstat *stbuf)
75{
76 kfree(stbuf->name);
77 kfree(stbuf->uid);
78 kfree(stbuf->gid);
79 kfree(stbuf->muid);
80 kfree(stbuf->extension);
81}
82EXPORT_SYMBOL(p9stat_free);
83
84static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
85{
86 size_t len = min(pdu->size - pdu->offset, size);
87 memcpy(data, &pdu->sdata[pdu->offset], len);
88 pdu->offset += len;
89 return size - len;
90}
91
92static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
93{
94 size_t len = min(pdu->capacity - pdu->size, size);
95 memcpy(&pdu->sdata[pdu->size], data, len);
96 pdu->size += len;
97 return size - len;
98}
99
100static size_t
101pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
102{
103 size_t len = min(pdu->capacity - pdu->size, size);
104 if (copy_from_user(&pdu->sdata[pdu->size], udata, len))
105 len = 0;
106
107 pdu->size += len;
108 return size - len;
109}
110
111static size_t
112pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata,
113 size_t size)
114{
115 BUG_ON(pdu->size > P9_IOHDRSZ);
116 pdu->pubuf = (char __user *)udata;
117 pdu->pkbuf = (char *)kdata;
118 pdu->pbuf_size = size;
119 return 0;
120}
121
122static size_t
123pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size)
124{
125 BUG_ON(pdu->size > P9_READDIRHDRSZ);
126 pdu->pkbuf = (char *)kdata;
127 pdu->pbuf_size = size;
128 return 0;
129}
130
131/*
132 b - int8_t
133 w - int16_t
134 d - int32_t
135 q - int64_t
136 s - string
137 S - stat
138 Q - qid
139 D - data blob (int32_t size followed by void *, results are not freed)
140 T - array of strings (int16_t count, followed by strings)
141 R - array of qids (int16_t count, followed by qids)
142 A - stat for 9p2000.L (p9_stat_dotl)
143 ? - if optional = 1, continue parsing
144*/
145
146static int
147p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
148 va_list ap)
149{
150 const char *ptr;
151 int errcode = 0;
152
153 for (ptr = fmt; *ptr; ptr++) {
154 switch (*ptr) {
155 case 'b':{
156 int8_t *val = va_arg(ap, int8_t *);
157 if (pdu_read(pdu, val, sizeof(*val))) {
158 errcode = -EFAULT;
159 break;
160 }
161 }
162 break;
163 case 'w':{
164 int16_t *val = va_arg(ap, int16_t *);
165 __le16 le_val;
166 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
167 errcode = -EFAULT;
168 break;
169 }
170 *val = le16_to_cpu(le_val);
171 }
172 break;
173 case 'd':{
174 int32_t *val = va_arg(ap, int32_t *);
175 __le32 le_val;
176 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
177 errcode = -EFAULT;
178 break;
179 }
180 *val = le32_to_cpu(le_val);
181 }
182 break;
183 case 'q':{
184 int64_t *val = va_arg(ap, int64_t *);
185 __le64 le_val;
186 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
187 errcode = -EFAULT;
188 break;
189 }
190 *val = le64_to_cpu(le_val);
191 }
192 break;
193 case 's':{
194 char **sptr = va_arg(ap, char **);
195 uint16_t len;
196
197 errcode = p9pdu_readf(pdu, proto_version,
198 "w", &len);
199 if (errcode)
200 break;
201
202 *sptr = kmalloc(len + 1, GFP_NOFS);
203 if (*sptr == NULL) {
204 errcode = -EFAULT;
205 break;
206 }
207 if (pdu_read(pdu, *sptr, len)) {
208 errcode = -EFAULT;
209 kfree(*sptr);
210 *sptr = NULL;
211 } else
212 (*sptr)[len] = 0;
213 }
214 break;
215 case 'Q':{
216 struct p9_qid *qid =
217 va_arg(ap, struct p9_qid *);
218
219 errcode = p9pdu_readf(pdu, proto_version, "bdq",
220 &qid->type, &qid->version,
221 &qid->path);
222 }
223 break;
224 case 'S':{
225 struct p9_wstat *stbuf =
226 va_arg(ap, struct p9_wstat *);
227
228 memset(stbuf, 0, sizeof(struct p9_wstat));
229 stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
230 -1;
231 errcode =
232 p9pdu_readf(pdu, proto_version,
233 "wwdQdddqssss?sddd",
234 &stbuf->size, &stbuf->type,
235 &stbuf->dev, &stbuf->qid,
236 &stbuf->mode, &stbuf->atime,
237 &stbuf->mtime, &stbuf->length,
238 &stbuf->name, &stbuf->uid,
239 &stbuf->gid, &stbuf->muid,
240 &stbuf->extension,
241 &stbuf->n_uid, &stbuf->n_gid,
242 &stbuf->n_muid);
243 if (errcode)
244 p9stat_free(stbuf);
245 }
246 break;
247 case 'D':{
248 uint32_t *count = va_arg(ap, uint32_t *);
249 void **data = va_arg(ap, void **);
250
251 errcode =
252 p9pdu_readf(pdu, proto_version, "d", count);
253 if (!errcode) {
254 *count =
255 min_t(uint32_t, *count,
256 pdu->size - pdu->offset);
257 *data = &pdu->sdata[pdu->offset];
258 }
259 }
260 break;
261 case 'T':{
262 uint16_t *nwname = va_arg(ap, uint16_t *);
263 char ***wnames = va_arg(ap, char ***);
264
265 errcode = p9pdu_readf(pdu, proto_version,
266 "w", nwname);
267 if (!errcode) {
268 *wnames =
269 kmalloc(sizeof(char *) * *nwname,
270 GFP_NOFS);
271 if (!*wnames)
272 errcode = -ENOMEM;
273 }
274
275 if (!errcode) {
276 int i;
277
278 for (i = 0; i < *nwname; i++) {
279 errcode =
280 p9pdu_readf(pdu,
281 proto_version,
282 "s",
283 &(*wnames)[i]);
284 if (errcode)
285 break;
286 }
287 }
288
289 if (errcode) {
290 if (*wnames) {
291 int i;
292
293 for (i = 0; i < *nwname; i++)
294 kfree((*wnames)[i]);
295 }
296 kfree(*wnames);
297 *wnames = NULL;
298 }
299 }
300 break;
301 case 'R':{
302 int16_t *nwqid = va_arg(ap, int16_t *);
303 struct p9_qid **wqids =
304 va_arg(ap, struct p9_qid **);
305
306 *wqids = NULL;
307
308 errcode =
309 p9pdu_readf(pdu, proto_version, "w", nwqid);
310 if (!errcode) {
311 *wqids =
312 kmalloc(*nwqid *
313 sizeof(struct p9_qid),
314 GFP_NOFS);
315 if (*wqids == NULL)
316 errcode = -ENOMEM;
317 }
318
319 if (!errcode) {
320 int i;
321
322 for (i = 0; i < *nwqid; i++) {
323 errcode =
324 p9pdu_readf(pdu,
325 proto_version,
326 "Q",
327 &(*wqids)[i]);
328 if (errcode)
329 break;
330 }
331 }
332
333 if (errcode) {
334 kfree(*wqids);
335 *wqids = NULL;
336 }
337 }
338 break;
339 case 'A': {
340 struct p9_stat_dotl *stbuf =
341 va_arg(ap, struct p9_stat_dotl *);
342
343 memset(stbuf, 0, sizeof(struct p9_stat_dotl));
344 errcode =
345 p9pdu_readf(pdu, proto_version,
346 "qQdddqqqqqqqqqqqqqqq",
347 &stbuf->st_result_mask,
348 &stbuf->qid,
349 &stbuf->st_mode,
350 &stbuf->st_uid, &stbuf->st_gid,
351 &stbuf->st_nlink,
352 &stbuf->st_rdev, &stbuf->st_size,
353 &stbuf->st_blksize, &stbuf->st_blocks,
354 &stbuf->st_atime_sec,
355 &stbuf->st_atime_nsec,
356 &stbuf->st_mtime_sec,
357 &stbuf->st_mtime_nsec,
358 &stbuf->st_ctime_sec,
359 &stbuf->st_ctime_nsec,
360 &stbuf->st_btime_sec,
361 &stbuf->st_btime_nsec,
362 &stbuf->st_gen,
363 &stbuf->st_data_version);
364 }
365 break;
366 case '?':
367 if ((proto_version != p9_proto_2000u) &&
368 (proto_version != p9_proto_2000L))
369 return 0;
370 break;
371 default:
372 BUG();
373 break;
374 }
375
376 if (errcode)
377 break;
378 }
379
380 return errcode;
381}
382
383int
384p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
385 va_list ap)
386{
387 const char *ptr;
388 int errcode = 0;
389
390 for (ptr = fmt; *ptr; ptr++) {
391 switch (*ptr) {
392 case 'b':{
393 int8_t val = va_arg(ap, int);
394 if (pdu_write(pdu, &val, sizeof(val)))
395 errcode = -EFAULT;
396 }
397 break;
398 case 'w':{
399 __le16 val = cpu_to_le16(va_arg(ap, int));
400 if (pdu_write(pdu, &val, sizeof(val)))
401 errcode = -EFAULT;
402 }
403 break;
404 case 'd':{
405 __le32 val = cpu_to_le32(va_arg(ap, int32_t));
406 if (pdu_write(pdu, &val, sizeof(val)))
407 errcode = -EFAULT;
408 }
409 break;
410 case 'q':{
411 __le64 val = cpu_to_le64(va_arg(ap, int64_t));
412 if (pdu_write(pdu, &val, sizeof(val)))
413 errcode = -EFAULT;
414 }
415 break;
416 case 's':{
417 const char *sptr = va_arg(ap, const char *);
418 uint16_t len = 0;
419 if (sptr)
420 len = min_t(uint16_t, strlen(sptr),
421 USHRT_MAX);
422
423 errcode = p9pdu_writef(pdu, proto_version,
424 "w", len);
425 if (!errcode && pdu_write(pdu, sptr, len))
426 errcode = -EFAULT;
427 }
428 break;
429 case 'Q':{
430 const struct p9_qid *qid =
431 va_arg(ap, const struct p9_qid *);
432 errcode =
433 p9pdu_writef(pdu, proto_version, "bdq",
434 qid->type, qid->version,
435 qid->path);
436 } break;
437 case 'S':{
438 const struct p9_wstat *stbuf =
439 va_arg(ap, const struct p9_wstat *);
440 errcode =
441 p9pdu_writef(pdu, proto_version,
442 "wwdQdddqssss?sddd",
443 stbuf->size, stbuf->type,
444 stbuf->dev, &stbuf->qid,
445 stbuf->mode, stbuf->atime,
446 stbuf->mtime, stbuf->length,
447 stbuf->name, stbuf->uid,
448 stbuf->gid, stbuf->muid,
449 stbuf->extension, stbuf->n_uid,
450 stbuf->n_gid, stbuf->n_muid);
451 } break;
452 case 'D':{
453 uint32_t count = va_arg(ap, uint32_t);
454 const void *data = va_arg(ap, const void *);
455
456 errcode = p9pdu_writef(pdu, proto_version, "d",
457 count);
458 if (!errcode && pdu_write(pdu, data, count))
459 errcode = -EFAULT;
460 }
461 break;
462 case 'E':{
463 int32_t cnt = va_arg(ap, int32_t);
464 const char *k = va_arg(ap, const void *);
465 const char __user *u = va_arg(ap,
466 const void __user *);
467 errcode = p9pdu_writef(pdu, proto_version, "d",
468 cnt);
469 if (!errcode && pdu_write_urw(pdu, k, u, cnt))
470 errcode = -EFAULT;
471 }
472 break;
473 case 'F':{
474 int32_t cnt = va_arg(ap, int32_t);
475 const char *k = va_arg(ap, const void *);
476 errcode = p9pdu_writef(pdu, proto_version, "d",
477 cnt);
478 if (!errcode && pdu_write_readdir(pdu, k, cnt))
479 errcode = -EFAULT;
480 }
481 break;
482 case 'U':{
483 int32_t count = va_arg(ap, int32_t);
484 const char __user *udata =
485 va_arg(ap, const void __user *);
486 errcode = p9pdu_writef(pdu, proto_version, "d",
487 count);
488 if (!errcode && pdu_write_u(pdu, udata, count))
489 errcode = -EFAULT;
490 }
491 break;
492 case 'T':{
493 uint16_t nwname = va_arg(ap, int);
494 const char **wnames = va_arg(ap, const char **);
495
496 errcode = p9pdu_writef(pdu, proto_version, "w",
497 nwname);
498 if (!errcode) {
499 int i;
500
501 for (i = 0; i < nwname; i++) {
502 errcode =
503 p9pdu_writef(pdu,
504 proto_version,
505 "s",
506 wnames[i]);
507 if (errcode)
508 break;
509 }
510 }
511 }
512 break;
513 case 'R':{
514 int16_t nwqid = va_arg(ap, int);
515 struct p9_qid *wqids =
516 va_arg(ap, struct p9_qid *);
517
518 errcode = p9pdu_writef(pdu, proto_version, "w",
519 nwqid);
520 if (!errcode) {
521 int i;
522
523 for (i = 0; i < nwqid; i++) {
524 errcode =
525 p9pdu_writef(pdu,
526 proto_version,
527 "Q",
528 &wqids[i]);
529 if (errcode)
530 break;
531 }
532 }
533 }
534 break;
535 case 'I':{
536 struct p9_iattr_dotl *p9attr = va_arg(ap,
537 struct p9_iattr_dotl *);
538
539 errcode = p9pdu_writef(pdu, proto_version,
540 "ddddqqqqq",
541 p9attr->valid,
542 p9attr->mode,
543 p9attr->uid,
544 p9attr->gid,
545 p9attr->size,
546 p9attr->atime_sec,
547 p9attr->atime_nsec,
548 p9attr->mtime_sec,
549 p9attr->mtime_nsec);
550 }
551 break;
552 case '?':
553 if ((proto_version != p9_proto_2000u) &&
554 (proto_version != p9_proto_2000L))
555 return 0;
556 break;
557 default:
558 BUG();
559 break;
560 }
561
562 if (errcode)
563 break;
564 }
565
566 return errcode;
567}
568
569int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
570{
571 va_list ap;
572 int ret;
573
574 va_start(ap, fmt);
575 ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
576 va_end(ap);
577
578 return ret;
579}
580
581static int
582p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
583{
584 va_list ap;
585 int ret;
586
587 va_start(ap, fmt);
588 ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
589 va_end(ap);
590
591 return ret;
592}
593
594int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
595{
596 struct p9_fcall fake_pdu;
597 int ret;
598
599 fake_pdu.size = len;
600 fake_pdu.capacity = len;
601 fake_pdu.sdata = buf;
602 fake_pdu.offset = 0;
603
604 ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
605 if (ret) {
606 P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
607 P9_DUMP_PKT(0, &fake_pdu);
608 }
609
610 return ret;
611}
612EXPORT_SYMBOL(p9stat_read);
613
614int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
615{
616 pdu->id = type;
617 return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
618}
619
620int p9pdu_finalize(struct p9_fcall *pdu)
621{
622 int size = pdu->size;
623 int err;
624
625 pdu->size = 0;
626 err = p9pdu_writef(pdu, 0, "d", size);
627 pdu->size = size;
628
629 P9_DUMP_PKT(0, pdu);
630 P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size,
631 pdu->id, pdu->tag);
632
633 return err;
634}
635
636void p9pdu_reset(struct p9_fcall *pdu)
637{
638 pdu->offset = 0;
639 pdu->size = 0;
640 pdu->private = NULL;
641 pdu->pubuf = NULL;
642 pdu->pkbuf = NULL;
643 pdu->pbuf_size = 0;
644}
645
646int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
647 int proto_version)
648{
649 struct p9_fcall fake_pdu;
650 int ret;
651 char *nameptr;
652
653 fake_pdu.size = len;
654 fake_pdu.capacity = len;
655 fake_pdu.sdata = buf;
656 fake_pdu.offset = 0;
657
658 ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid,
659 &dirent->d_off, &dirent->d_type, &nameptr);
660 if (ret) {
661 P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
662 P9_DUMP_PKT(1, &fake_pdu);
663 goto out;
664 }
665
666 strcpy(dirent->d_name, nameptr);
667 kfree(nameptr);
668
669out:
670 return fake_pdu.offset;
671}
672EXPORT_SYMBOL(p9dirent_read);
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
43static int
44p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
45
46void p9stat_free(struct p9_wstat *stbuf)
47{
48 kfree(stbuf->name);
49 kfree(stbuf->uid);
50 kfree(stbuf->gid);
51 kfree(stbuf->muid);
52 kfree(stbuf->extension);
53}
54EXPORT_SYMBOL(p9stat_free);
55
56size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
57{
58 size_t len = min(pdu->size - pdu->offset, size);
59 memcpy(data, &pdu->sdata[pdu->offset], len);
60 pdu->offset += len;
61 return size - len;
62}
63
64static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
65{
66 size_t len = min(pdu->capacity - pdu->size, size);
67 memcpy(&pdu->sdata[pdu->size], data, len);
68 pdu->size += len;
69 return size - len;
70}
71
72static size_t
73pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size)
74{
75 size_t len = min(pdu->capacity - pdu->size, size);
76 struct iov_iter i = *from;
77 if (copy_from_iter(&pdu->sdata[pdu->size], len, &i) != len)
78 len = 0;
79
80 pdu->size += len;
81 return size - len;
82}
83
84/*
85 b - int8_t
86 w - int16_t
87 d - int32_t
88 q - int64_t
89 s - string
90 u - numeric uid
91 g - numeric gid
92 S - stat
93 Q - qid
94 D - data blob (int32_t size followed by void *, results are not freed)
95 T - array of strings (int16_t count, followed by strings)
96 R - array of qids (int16_t count, followed by qids)
97 A - stat for 9p2000.L (p9_stat_dotl)
98 ? - if optional = 1, continue parsing
99*/
100
101static int
102p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
103 va_list ap)
104{
105 const char *ptr;
106 int errcode = 0;
107
108 for (ptr = fmt; *ptr; ptr++) {
109 switch (*ptr) {
110 case 'b':{
111 int8_t *val = va_arg(ap, int8_t *);
112 if (pdu_read(pdu, val, sizeof(*val))) {
113 errcode = -EFAULT;
114 break;
115 }
116 }
117 break;
118 case 'w':{
119 int16_t *val = va_arg(ap, int16_t *);
120 __le16 le_val;
121 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
122 errcode = -EFAULT;
123 break;
124 }
125 *val = le16_to_cpu(le_val);
126 }
127 break;
128 case 'd':{
129 int32_t *val = va_arg(ap, int32_t *);
130 __le32 le_val;
131 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
132 errcode = -EFAULT;
133 break;
134 }
135 *val = le32_to_cpu(le_val);
136 }
137 break;
138 case 'q':{
139 int64_t *val = va_arg(ap, int64_t *);
140 __le64 le_val;
141 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
142 errcode = -EFAULT;
143 break;
144 }
145 *val = le64_to_cpu(le_val);
146 }
147 break;
148 case 's':{
149 char **sptr = va_arg(ap, char **);
150 uint16_t len;
151
152 errcode = p9pdu_readf(pdu, proto_version,
153 "w", &len);
154 if (errcode)
155 break;
156
157 *sptr = kmalloc(len + 1, GFP_NOFS);
158 if (*sptr == NULL) {
159 errcode = -EFAULT;
160 break;
161 }
162 if (pdu_read(pdu, *sptr, len)) {
163 errcode = -EFAULT;
164 kfree(*sptr);
165 *sptr = NULL;
166 } else
167 (*sptr)[len] = 0;
168 }
169 break;
170 case 'u': {
171 kuid_t *uid = va_arg(ap, kuid_t *);
172 __le32 le_val;
173 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
174 errcode = -EFAULT;
175 break;
176 }
177 *uid = make_kuid(&init_user_ns,
178 le32_to_cpu(le_val));
179 } break;
180 case 'g': {
181 kgid_t *gid = va_arg(ap, kgid_t *);
182 __le32 le_val;
183 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
184 errcode = -EFAULT;
185 break;
186 }
187 *gid = make_kgid(&init_user_ns,
188 le32_to_cpu(le_val));
189 } break;
190 case 'Q':{
191 struct p9_qid *qid =
192 va_arg(ap, struct p9_qid *);
193
194 errcode = p9pdu_readf(pdu, proto_version, "bdq",
195 &qid->type, &qid->version,
196 &qid->path);
197 }
198 break;
199 case 'S':{
200 struct p9_wstat *stbuf =
201 va_arg(ap, struct p9_wstat *);
202
203 memset(stbuf, 0, sizeof(struct p9_wstat));
204 stbuf->n_uid = stbuf->n_muid = INVALID_UID;
205 stbuf->n_gid = INVALID_GID;
206
207 errcode =
208 p9pdu_readf(pdu, proto_version,
209 "wwdQdddqssss?sugu",
210 &stbuf->size, &stbuf->type,
211 &stbuf->dev, &stbuf->qid,
212 &stbuf->mode, &stbuf->atime,
213 &stbuf->mtime, &stbuf->length,
214 &stbuf->name, &stbuf->uid,
215 &stbuf->gid, &stbuf->muid,
216 &stbuf->extension,
217 &stbuf->n_uid, &stbuf->n_gid,
218 &stbuf->n_muid);
219 if (errcode)
220 p9stat_free(stbuf);
221 }
222 break;
223 case 'D':{
224 uint32_t *count = va_arg(ap, uint32_t *);
225 void **data = va_arg(ap, void **);
226
227 errcode =
228 p9pdu_readf(pdu, proto_version, "d", count);
229 if (!errcode) {
230 *count =
231 min_t(uint32_t, *count,
232 pdu->size - pdu->offset);
233 *data = &pdu->sdata[pdu->offset];
234 }
235 }
236 break;
237 case 'T':{
238 uint16_t *nwname = va_arg(ap, uint16_t *);
239 char ***wnames = va_arg(ap, char ***);
240
241 errcode = p9pdu_readf(pdu, proto_version,
242 "w", nwname);
243 if (!errcode) {
244 *wnames =
245 kmalloc(sizeof(char *) * *nwname,
246 GFP_NOFS);
247 if (!*wnames)
248 errcode = -ENOMEM;
249 }
250
251 if (!errcode) {
252 int i;
253
254 for (i = 0; i < *nwname; i++) {
255 errcode =
256 p9pdu_readf(pdu,
257 proto_version,
258 "s",
259 &(*wnames)[i]);
260 if (errcode)
261 break;
262 }
263 }
264
265 if (errcode) {
266 if (*wnames) {
267 int i;
268
269 for (i = 0; i < *nwname; i++)
270 kfree((*wnames)[i]);
271 }
272 kfree(*wnames);
273 *wnames = NULL;
274 }
275 }
276 break;
277 case 'R':{
278 uint16_t *nwqid = va_arg(ap, uint16_t *);
279 struct p9_qid **wqids =
280 va_arg(ap, struct p9_qid **);
281
282 *wqids = NULL;
283
284 errcode =
285 p9pdu_readf(pdu, proto_version, "w", nwqid);
286 if (!errcode) {
287 *wqids =
288 kmalloc(*nwqid *
289 sizeof(struct p9_qid),
290 GFP_NOFS);
291 if (*wqids == NULL)
292 errcode = -ENOMEM;
293 }
294
295 if (!errcode) {
296 int i;
297
298 for (i = 0; i < *nwqid; i++) {
299 errcode =
300 p9pdu_readf(pdu,
301 proto_version,
302 "Q",
303 &(*wqids)[i]);
304 if (errcode)
305 break;
306 }
307 }
308
309 if (errcode) {
310 kfree(*wqids);
311 *wqids = NULL;
312 }
313 }
314 break;
315 case 'A': {
316 struct p9_stat_dotl *stbuf =
317 va_arg(ap, struct p9_stat_dotl *);
318
319 memset(stbuf, 0, sizeof(struct p9_stat_dotl));
320 errcode =
321 p9pdu_readf(pdu, proto_version,
322 "qQdugqqqqqqqqqqqqqqq",
323 &stbuf->st_result_mask,
324 &stbuf->qid,
325 &stbuf->st_mode,
326 &stbuf->st_uid, &stbuf->st_gid,
327 &stbuf->st_nlink,
328 &stbuf->st_rdev, &stbuf->st_size,
329 &stbuf->st_blksize, &stbuf->st_blocks,
330 &stbuf->st_atime_sec,
331 &stbuf->st_atime_nsec,
332 &stbuf->st_mtime_sec,
333 &stbuf->st_mtime_nsec,
334 &stbuf->st_ctime_sec,
335 &stbuf->st_ctime_nsec,
336 &stbuf->st_btime_sec,
337 &stbuf->st_btime_nsec,
338 &stbuf->st_gen,
339 &stbuf->st_data_version);
340 }
341 break;
342 case '?':
343 if ((proto_version != p9_proto_2000u) &&
344 (proto_version != p9_proto_2000L))
345 return 0;
346 break;
347 default:
348 BUG();
349 break;
350 }
351
352 if (errcode)
353 break;
354 }
355
356 return errcode;
357}
358
359int
360p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
361 va_list ap)
362{
363 const char *ptr;
364 int errcode = 0;
365
366 for (ptr = fmt; *ptr; ptr++) {
367 switch (*ptr) {
368 case 'b':{
369 int8_t val = va_arg(ap, int);
370 if (pdu_write(pdu, &val, sizeof(val)))
371 errcode = -EFAULT;
372 }
373 break;
374 case 'w':{
375 __le16 val = cpu_to_le16(va_arg(ap, int));
376 if (pdu_write(pdu, &val, sizeof(val)))
377 errcode = -EFAULT;
378 }
379 break;
380 case 'd':{
381 __le32 val = cpu_to_le32(va_arg(ap, int32_t));
382 if (pdu_write(pdu, &val, sizeof(val)))
383 errcode = -EFAULT;
384 }
385 break;
386 case 'q':{
387 __le64 val = cpu_to_le64(va_arg(ap, int64_t));
388 if (pdu_write(pdu, &val, sizeof(val)))
389 errcode = -EFAULT;
390 }
391 break;
392 case 's':{
393 const char *sptr = va_arg(ap, const char *);
394 uint16_t len = 0;
395 if (sptr)
396 len = min_t(size_t, strlen(sptr),
397 USHRT_MAX);
398
399 errcode = p9pdu_writef(pdu, proto_version,
400 "w", len);
401 if (!errcode && pdu_write(pdu, sptr, len))
402 errcode = -EFAULT;
403 }
404 break;
405 case 'u': {
406 kuid_t uid = va_arg(ap, kuid_t);
407 __le32 val = cpu_to_le32(
408 from_kuid(&init_user_ns, uid));
409 if (pdu_write(pdu, &val, sizeof(val)))
410 errcode = -EFAULT;
411 } break;
412 case 'g': {
413 kgid_t gid = va_arg(ap, kgid_t);
414 __le32 val = cpu_to_le32(
415 from_kgid(&init_user_ns, gid));
416 if (pdu_write(pdu, &val, sizeof(val)))
417 errcode = -EFAULT;
418 } break;
419 case 'Q':{
420 const struct p9_qid *qid =
421 va_arg(ap, const struct p9_qid *);
422 errcode =
423 p9pdu_writef(pdu, proto_version, "bdq",
424 qid->type, qid->version,
425 qid->path);
426 } break;
427 case 'S':{
428 const struct p9_wstat *stbuf =
429 va_arg(ap, const struct p9_wstat *);
430 errcode =
431 p9pdu_writef(pdu, proto_version,
432 "wwdQdddqssss?sugu",
433 stbuf->size, stbuf->type,
434 stbuf->dev, &stbuf->qid,
435 stbuf->mode, stbuf->atime,
436 stbuf->mtime, stbuf->length,
437 stbuf->name, stbuf->uid,
438 stbuf->gid, stbuf->muid,
439 stbuf->extension, stbuf->n_uid,
440 stbuf->n_gid, stbuf->n_muid);
441 } break;
442 case 'V':{
443 uint32_t count = va_arg(ap, uint32_t);
444 struct iov_iter *from =
445 va_arg(ap, struct iov_iter *);
446 errcode = p9pdu_writef(pdu, proto_version, "d",
447 count);
448 if (!errcode && pdu_write_u(pdu, from, count))
449 errcode = -EFAULT;
450 }
451 break;
452 case 'T':{
453 uint16_t nwname = va_arg(ap, int);
454 const char **wnames = va_arg(ap, const char **);
455
456 errcode = p9pdu_writef(pdu, proto_version, "w",
457 nwname);
458 if (!errcode) {
459 int i;
460
461 for (i = 0; i < nwname; i++) {
462 errcode =
463 p9pdu_writef(pdu,
464 proto_version,
465 "s",
466 wnames[i]);
467 if (errcode)
468 break;
469 }
470 }
471 }
472 break;
473 case 'R':{
474 uint16_t nwqid = va_arg(ap, int);
475 struct p9_qid *wqids =
476 va_arg(ap, struct p9_qid *);
477
478 errcode = p9pdu_writef(pdu, proto_version, "w",
479 nwqid);
480 if (!errcode) {
481 int i;
482
483 for (i = 0; i < nwqid; i++) {
484 errcode =
485 p9pdu_writef(pdu,
486 proto_version,
487 "Q",
488 &wqids[i]);
489 if (errcode)
490 break;
491 }
492 }
493 }
494 break;
495 case 'I':{
496 struct p9_iattr_dotl *p9attr = va_arg(ap,
497 struct p9_iattr_dotl *);
498
499 errcode = p9pdu_writef(pdu, proto_version,
500 "ddugqqqqq",
501 p9attr->valid,
502 p9attr->mode,
503 p9attr->uid,
504 p9attr->gid,
505 p9attr->size,
506 p9attr->atime_sec,
507 p9attr->atime_nsec,
508 p9attr->mtime_sec,
509 p9attr->mtime_nsec);
510 }
511 break;
512 case '?':
513 if ((proto_version != p9_proto_2000u) &&
514 (proto_version != p9_proto_2000L))
515 return 0;
516 break;
517 default:
518 BUG();
519 break;
520 }
521
522 if (errcode)
523 break;
524 }
525
526 return errcode;
527}
528
529int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
530{
531 va_list ap;
532 int ret;
533
534 va_start(ap, fmt);
535 ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
536 va_end(ap);
537
538 return ret;
539}
540
541static int
542p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
543{
544 va_list ap;
545 int ret;
546
547 va_start(ap, fmt);
548 ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
549 va_end(ap);
550
551 return ret;
552}
553
554int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st)
555{
556 struct p9_fcall fake_pdu;
557 int ret;
558
559 fake_pdu.size = len;
560 fake_pdu.capacity = len;
561 fake_pdu.sdata = buf;
562 fake_pdu.offset = 0;
563
564 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st);
565 if (ret) {
566 p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
567 trace_9p_protocol_dump(clnt, &fake_pdu);
568 }
569
570 return ret;
571}
572EXPORT_SYMBOL(p9stat_read);
573
574int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
575{
576 pdu->id = type;
577 return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
578}
579
580int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu)
581{
582 int size = pdu->size;
583 int err;
584
585 pdu->size = 0;
586 err = p9pdu_writef(pdu, 0, "d", size);
587 pdu->size = size;
588
589 trace_9p_protocol_dump(clnt, pdu);
590 p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n",
591 pdu->size, pdu->id, pdu->tag);
592
593 return err;
594}
595
596void p9pdu_reset(struct p9_fcall *pdu)
597{
598 pdu->offset = 0;
599 pdu->size = 0;
600}
601
602int p9dirent_read(struct p9_client *clnt, char *buf, int len,
603 struct p9_dirent *dirent)
604{
605 struct p9_fcall fake_pdu;
606 int ret;
607 char *nameptr;
608
609 fake_pdu.size = len;
610 fake_pdu.capacity = len;
611 fake_pdu.sdata = buf;
612 fake_pdu.offset = 0;
613
614 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid,
615 &dirent->d_off, &dirent->d_type, &nameptr);
616 if (ret) {
617 p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
618 trace_9p_protocol_dump(clnt, &fake_pdu);
619 goto out;
620 }
621
622 strcpy(dirent->d_name, nameptr);
623 kfree(nameptr);
624
625out:
626 return fake_pdu.offset;
627}
628EXPORT_SYMBOL(p9dirent_read);