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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
40#include <trace/events/9p.h>
41
42static int
43p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
44
45void p9stat_free(struct p9_wstat *stbuf)
46{
47 kfree(stbuf->name);
48 kfree(stbuf->uid);
49 kfree(stbuf->gid);
50 kfree(stbuf->muid);
51 kfree(stbuf->extension);
52}
53EXPORT_SYMBOL(p9stat_free);
54
55size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
56{
57 size_t len = min(pdu->size - pdu->offset, size);
58 memcpy(data, &pdu->sdata[pdu->offset], len);
59 pdu->offset += len;
60 return size - len;
61}
62
63static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
64{
65 size_t len = min(pdu->capacity - pdu->size, size);
66 memcpy(&pdu->sdata[pdu->size], data, len);
67 pdu->size += len;
68 return size - len;
69}
70
71static size_t
72pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
73{
74 size_t len = min(pdu->capacity - pdu->size, size);
75 if (copy_from_user(&pdu->sdata[pdu->size], udata, len))
76 len = 0;
77
78 pdu->size += len;
79 return size - len;
80}
81
82/*
83 b - int8_t
84 w - int16_t
85 d - int32_t
86 q - int64_t
87 s - string
88 u - numeric uid
89 g - numeric gid
90 S - stat
91 Q - qid
92 D - data blob (int32_t size followed by void *, results are not freed)
93 T - array of strings (int16_t count, followed by strings)
94 R - array of qids (int16_t count, followed by qids)
95 A - stat for 9p2000.L (p9_stat_dotl)
96 ? - if optional = 1, continue parsing
97*/
98
99static int
100p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
101 va_list ap)
102{
103 const char *ptr;
104 int errcode = 0;
105
106 for (ptr = fmt; *ptr; ptr++) {
107 switch (*ptr) {
108 case 'b':{
109 int8_t *val = va_arg(ap, int8_t *);
110 if (pdu_read(pdu, val, sizeof(*val))) {
111 errcode = -EFAULT;
112 break;
113 }
114 }
115 break;
116 case 'w':{
117 int16_t *val = va_arg(ap, int16_t *);
118 __le16 le_val;
119 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
120 errcode = -EFAULT;
121 break;
122 }
123 *val = le16_to_cpu(le_val);
124 }
125 break;
126 case 'd':{
127 int32_t *val = va_arg(ap, int32_t *);
128 __le32 le_val;
129 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
130 errcode = -EFAULT;
131 break;
132 }
133 *val = le32_to_cpu(le_val);
134 }
135 break;
136 case 'q':{
137 int64_t *val = va_arg(ap, int64_t *);
138 __le64 le_val;
139 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
140 errcode = -EFAULT;
141 break;
142 }
143 *val = le64_to_cpu(le_val);
144 }
145 break;
146 case 's':{
147 char **sptr = va_arg(ap, char **);
148 uint16_t len;
149
150 errcode = p9pdu_readf(pdu, proto_version,
151 "w", &len);
152 if (errcode)
153 break;
154
155 *sptr = kmalloc(len + 1, GFP_NOFS);
156 if (*sptr == NULL) {
157 errcode = -EFAULT;
158 break;
159 }
160 if (pdu_read(pdu, *sptr, len)) {
161 errcode = -EFAULT;
162 kfree(*sptr);
163 *sptr = NULL;
164 } else
165 (*sptr)[len] = 0;
166 }
167 break;
168 case 'u': {
169 kuid_t *uid = va_arg(ap, kuid_t *);
170 __le32 le_val;
171 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
172 errcode = -EFAULT;
173 break;
174 }
175 *uid = make_kuid(&init_user_ns,
176 le32_to_cpu(le_val));
177 } break;
178 case 'g': {
179 kgid_t *gid = va_arg(ap, kgid_t *);
180 __le32 le_val;
181 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
182 errcode = -EFAULT;
183 break;
184 }
185 *gid = make_kgid(&init_user_ns,
186 le32_to_cpu(le_val));
187 } break;
188 case 'Q':{
189 struct p9_qid *qid =
190 va_arg(ap, struct p9_qid *);
191
192 errcode = p9pdu_readf(pdu, proto_version, "bdq",
193 &qid->type, &qid->version,
194 &qid->path);
195 }
196 break;
197 case 'S':{
198 struct p9_wstat *stbuf =
199 va_arg(ap, struct p9_wstat *);
200
201 memset(stbuf, 0, sizeof(struct p9_wstat));
202 stbuf->n_uid = stbuf->n_muid = INVALID_UID;
203 stbuf->n_gid = INVALID_GID;
204
205 errcode =
206 p9pdu_readf(pdu, proto_version,
207 "wwdQdddqssss?sugu",
208 &stbuf->size, &stbuf->type,
209 &stbuf->dev, &stbuf->qid,
210 &stbuf->mode, &stbuf->atime,
211 &stbuf->mtime, &stbuf->length,
212 &stbuf->name, &stbuf->uid,
213 &stbuf->gid, &stbuf->muid,
214 &stbuf->extension,
215 &stbuf->n_uid, &stbuf->n_gid,
216 &stbuf->n_muid);
217 if (errcode)
218 p9stat_free(stbuf);
219 }
220 break;
221 case 'D':{
222 uint32_t *count = va_arg(ap, uint32_t *);
223 void **data = va_arg(ap, void **);
224
225 errcode =
226 p9pdu_readf(pdu, proto_version, "d", count);
227 if (!errcode) {
228 *count =
229 min_t(uint32_t, *count,
230 pdu->size - pdu->offset);
231 *data = &pdu->sdata[pdu->offset];
232 }
233 }
234 break;
235 case 'T':{
236 uint16_t *nwname = va_arg(ap, uint16_t *);
237 char ***wnames = va_arg(ap, char ***);
238
239 errcode = p9pdu_readf(pdu, proto_version,
240 "w", nwname);
241 if (!errcode) {
242 *wnames =
243 kmalloc(sizeof(char *) * *nwname,
244 GFP_NOFS);
245 if (!*wnames)
246 errcode = -ENOMEM;
247 }
248
249 if (!errcode) {
250 int i;
251
252 for (i = 0; i < *nwname; i++) {
253 errcode =
254 p9pdu_readf(pdu,
255 proto_version,
256 "s",
257 &(*wnames)[i]);
258 if (errcode)
259 break;
260 }
261 }
262
263 if (errcode) {
264 if (*wnames) {
265 int i;
266
267 for (i = 0; i < *nwname; i++)
268 kfree((*wnames)[i]);
269 }
270 kfree(*wnames);
271 *wnames = NULL;
272 }
273 }
274 break;
275 case 'R':{
276 int16_t *nwqid = va_arg(ap, int16_t *);
277 struct p9_qid **wqids =
278 va_arg(ap, struct p9_qid **);
279
280 *wqids = NULL;
281
282 errcode =
283 p9pdu_readf(pdu, proto_version, "w", nwqid);
284 if (!errcode) {
285 *wqids =
286 kmalloc(*nwqid *
287 sizeof(struct p9_qid),
288 GFP_NOFS);
289 if (*wqids == NULL)
290 errcode = -ENOMEM;
291 }
292
293 if (!errcode) {
294 int i;
295
296 for (i = 0; i < *nwqid; i++) {
297 errcode =
298 p9pdu_readf(pdu,
299 proto_version,
300 "Q",
301 &(*wqids)[i]);
302 if (errcode)
303 break;
304 }
305 }
306
307 if (errcode) {
308 kfree(*wqids);
309 *wqids = NULL;
310 }
311 }
312 break;
313 case 'A': {
314 struct p9_stat_dotl *stbuf =
315 va_arg(ap, struct p9_stat_dotl *);
316
317 memset(stbuf, 0, sizeof(struct p9_stat_dotl));
318 errcode =
319 p9pdu_readf(pdu, proto_version,
320 "qQdugqqqqqqqqqqqqqqq",
321 &stbuf->st_result_mask,
322 &stbuf->qid,
323 &stbuf->st_mode,
324 &stbuf->st_uid, &stbuf->st_gid,
325 &stbuf->st_nlink,
326 &stbuf->st_rdev, &stbuf->st_size,
327 &stbuf->st_blksize, &stbuf->st_blocks,
328 &stbuf->st_atime_sec,
329 &stbuf->st_atime_nsec,
330 &stbuf->st_mtime_sec,
331 &stbuf->st_mtime_nsec,
332 &stbuf->st_ctime_sec,
333 &stbuf->st_ctime_nsec,
334 &stbuf->st_btime_sec,
335 &stbuf->st_btime_nsec,
336 &stbuf->st_gen,
337 &stbuf->st_data_version);
338 }
339 break;
340 case '?':
341 if ((proto_version != p9_proto_2000u) &&
342 (proto_version != p9_proto_2000L))
343 return 0;
344 break;
345 default:
346 BUG();
347 break;
348 }
349
350 if (errcode)
351 break;
352 }
353
354 return errcode;
355}
356
357int
358p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
359 va_list ap)
360{
361 const char *ptr;
362 int errcode = 0;
363
364 for (ptr = fmt; *ptr; ptr++) {
365 switch (*ptr) {
366 case 'b':{
367 int8_t val = va_arg(ap, int);
368 if (pdu_write(pdu, &val, sizeof(val)))
369 errcode = -EFAULT;
370 }
371 break;
372 case 'w':{
373 __le16 val = cpu_to_le16(va_arg(ap, int));
374 if (pdu_write(pdu, &val, sizeof(val)))
375 errcode = -EFAULT;
376 }
377 break;
378 case 'd':{
379 __le32 val = cpu_to_le32(va_arg(ap, int32_t));
380 if (pdu_write(pdu, &val, sizeof(val)))
381 errcode = -EFAULT;
382 }
383 break;
384 case 'q':{
385 __le64 val = cpu_to_le64(va_arg(ap, int64_t));
386 if (pdu_write(pdu, &val, sizeof(val)))
387 errcode = -EFAULT;
388 }
389 break;
390 case 's':{
391 const char *sptr = va_arg(ap, const char *);
392 uint16_t len = 0;
393 if (sptr)
394 len = min_t(size_t, strlen(sptr),
395 USHRT_MAX);
396
397 errcode = p9pdu_writef(pdu, proto_version,
398 "w", len);
399 if (!errcode && pdu_write(pdu, sptr, len))
400 errcode = -EFAULT;
401 }
402 break;
403 case 'u': {
404 kuid_t uid = va_arg(ap, kuid_t);
405 __le32 val = cpu_to_le32(
406 from_kuid(&init_user_ns, uid));
407 if (pdu_write(pdu, &val, sizeof(val)))
408 errcode = -EFAULT;
409 } break;
410 case 'g': {
411 kgid_t gid = va_arg(ap, kgid_t);
412 __le32 val = cpu_to_le32(
413 from_kgid(&init_user_ns, gid));
414 if (pdu_write(pdu, &val, sizeof(val)))
415 errcode = -EFAULT;
416 } break;
417 case 'Q':{
418 const struct p9_qid *qid =
419 va_arg(ap, const struct p9_qid *);
420 errcode =
421 p9pdu_writef(pdu, proto_version, "bdq",
422 qid->type, qid->version,
423 qid->path);
424 } break;
425 case 'S':{
426 const struct p9_wstat *stbuf =
427 va_arg(ap, const struct p9_wstat *);
428 errcode =
429 p9pdu_writef(pdu, proto_version,
430 "wwdQdddqssss?sugu",
431 stbuf->size, stbuf->type,
432 stbuf->dev, &stbuf->qid,
433 stbuf->mode, stbuf->atime,
434 stbuf->mtime, stbuf->length,
435 stbuf->name, stbuf->uid,
436 stbuf->gid, stbuf->muid,
437 stbuf->extension, stbuf->n_uid,
438 stbuf->n_gid, stbuf->n_muid);
439 } break;
440 case 'D':{
441 uint32_t count = va_arg(ap, uint32_t);
442 const void *data = va_arg(ap, const void *);
443
444 errcode = p9pdu_writef(pdu, proto_version, "d",
445 count);
446 if (!errcode && pdu_write(pdu, data, count))
447 errcode = -EFAULT;
448 }
449 break;
450 case 'U':{
451 int32_t count = va_arg(ap, int32_t);
452 const char __user *udata =
453 va_arg(ap, const void __user *);
454 errcode = p9pdu_writef(pdu, proto_version, "d",
455 count);
456 if (!errcode && pdu_write_u(pdu, udata, count))
457 errcode = -EFAULT;
458 }
459 break;
460 case 'T':{
461 uint16_t nwname = va_arg(ap, int);
462 const char **wnames = va_arg(ap, const char **);
463
464 errcode = p9pdu_writef(pdu, proto_version, "w",
465 nwname);
466 if (!errcode) {
467 int i;
468
469 for (i = 0; i < nwname; i++) {
470 errcode =
471 p9pdu_writef(pdu,
472 proto_version,
473 "s",
474 wnames[i]);
475 if (errcode)
476 break;
477 }
478 }
479 }
480 break;
481 case 'R':{
482 int16_t nwqid = va_arg(ap, int);
483 struct p9_qid *wqids =
484 va_arg(ap, struct p9_qid *);
485
486 errcode = p9pdu_writef(pdu, proto_version, "w",
487 nwqid);
488 if (!errcode) {
489 int i;
490
491 for (i = 0; i < nwqid; i++) {
492 errcode =
493 p9pdu_writef(pdu,
494 proto_version,
495 "Q",
496 &wqids[i]);
497 if (errcode)
498 break;
499 }
500 }
501 }
502 break;
503 case 'I':{
504 struct p9_iattr_dotl *p9attr = va_arg(ap,
505 struct p9_iattr_dotl *);
506
507 errcode = p9pdu_writef(pdu, proto_version,
508 "ddugqqqqq",
509 p9attr->valid,
510 p9attr->mode,
511 p9attr->uid,
512 p9attr->gid,
513 p9attr->size,
514 p9attr->atime_sec,
515 p9attr->atime_nsec,
516 p9attr->mtime_sec,
517 p9attr->mtime_nsec);
518 }
519 break;
520 case '?':
521 if ((proto_version != p9_proto_2000u) &&
522 (proto_version != p9_proto_2000L))
523 return 0;
524 break;
525 default:
526 BUG();
527 break;
528 }
529
530 if (errcode)
531 break;
532 }
533
534 return errcode;
535}
536
537int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
538{
539 va_list ap;
540 int ret;
541
542 va_start(ap, fmt);
543 ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
544 va_end(ap);
545
546 return ret;
547}
548
549static int
550p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
551{
552 va_list ap;
553 int ret;
554
555 va_start(ap, fmt);
556 ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
557 va_end(ap);
558
559 return ret;
560}
561
562int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st)
563{
564 struct p9_fcall fake_pdu;
565 int ret;
566
567 fake_pdu.size = len;
568 fake_pdu.capacity = len;
569 fake_pdu.sdata = buf;
570 fake_pdu.offset = 0;
571
572 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st);
573 if (ret) {
574 p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
575 trace_9p_protocol_dump(clnt, &fake_pdu);
576 }
577
578 return ret;
579}
580EXPORT_SYMBOL(p9stat_read);
581
582int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
583{
584 pdu->id = type;
585 return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
586}
587
588int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu)
589{
590 int size = pdu->size;
591 int err;
592
593 pdu->size = 0;
594 err = p9pdu_writef(pdu, 0, "d", size);
595 pdu->size = size;
596
597 trace_9p_protocol_dump(clnt, pdu);
598 p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n",
599 pdu->size, pdu->id, pdu->tag);
600
601 return err;
602}
603
604void p9pdu_reset(struct p9_fcall *pdu)
605{
606 pdu->offset = 0;
607 pdu->size = 0;
608}
609
610int p9dirent_read(struct p9_client *clnt, char *buf, int len,
611 struct p9_dirent *dirent)
612{
613 struct p9_fcall fake_pdu;
614 int ret;
615 char *nameptr;
616
617 fake_pdu.size = len;
618 fake_pdu.capacity = len;
619 fake_pdu.sdata = buf;
620 fake_pdu.offset = 0;
621
622 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid,
623 &dirent->d_off, &dirent->d_type, &nameptr);
624 if (ret) {
625 p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
626 trace_9p_protocol_dump(clnt, &fake_pdu);
627 goto out;
628 }
629
630 strcpy(dirent->d_name, nameptr);
631 kfree(nameptr);
632
633out:
634 return fake_pdu.offset;
635}
636EXPORT_SYMBOL(p9dirent_read);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * net/9p/protocol.c
4 *
5 * 9P Protocol Support Code
6 *
7 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 *
9 * Base on code from Anthony Liguori <aliguori@us.ibm.com>
10 * Copyright (C) 2008 by IBM, Corp.
11 */
12
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/uaccess.h>
17#include <linux/slab.h>
18#include <linux/sched.h>
19#include <linux/stddef.h>
20#include <linux/types.h>
21#include <linux/uio.h>
22#include <net/9p/9p.h>
23#include <net/9p/client.h>
24#include "protocol.h"
25
26#include <trace/events/9p.h>
27
28static int
29p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
30
31void p9stat_free(struct p9_wstat *stbuf)
32{
33 kfree(stbuf->name);
34 stbuf->name = NULL;
35 kfree(stbuf->uid);
36 stbuf->uid = NULL;
37 kfree(stbuf->gid);
38 stbuf->gid = NULL;
39 kfree(stbuf->muid);
40 stbuf->muid = NULL;
41 kfree(stbuf->extension);
42 stbuf->extension = NULL;
43}
44EXPORT_SYMBOL(p9stat_free);
45
46size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
47{
48 size_t len = min(pdu->size - pdu->offset, size);
49 memcpy(data, &pdu->sdata[pdu->offset], len);
50 pdu->offset += len;
51 return size - len;
52}
53
54static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
55{
56 size_t len = min(pdu->capacity - pdu->size, size);
57 memcpy(&pdu->sdata[pdu->size], data, len);
58 pdu->size += len;
59 return size - len;
60}
61
62static size_t
63pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size)
64{
65 size_t len = min(pdu->capacity - pdu->size, size);
66 struct iov_iter i = *from;
67 if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, &i))
68 len = 0;
69
70 pdu->size += len;
71 return size - len;
72}
73
74/*
75 b - int8_t
76 w - int16_t
77 d - int32_t
78 q - int64_t
79 s - string
80 u - numeric uid
81 g - numeric gid
82 S - stat
83 Q - qid
84 D - data blob (int32_t size followed by void *, results are not freed)
85 T - array of strings (int16_t count, followed by strings)
86 R - array of qids (int16_t count, followed by qids)
87 A - stat for 9p2000.L (p9_stat_dotl)
88 ? - if optional = 1, continue parsing
89*/
90
91static int
92p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
93 va_list ap)
94{
95 const char *ptr;
96 int errcode = 0;
97
98 for (ptr = fmt; *ptr; ptr++) {
99 switch (*ptr) {
100 case 'b':{
101 int8_t *val = va_arg(ap, int8_t *);
102 if (pdu_read(pdu, val, sizeof(*val))) {
103 errcode = -EFAULT;
104 break;
105 }
106 }
107 break;
108 case 'w':{
109 int16_t *val = va_arg(ap, int16_t *);
110 __le16 le_val;
111 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
112 errcode = -EFAULT;
113 break;
114 }
115 *val = le16_to_cpu(le_val);
116 }
117 break;
118 case 'd':{
119 int32_t *val = va_arg(ap, int32_t *);
120 __le32 le_val;
121 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
122 errcode = -EFAULT;
123 break;
124 }
125 *val = le32_to_cpu(le_val);
126 }
127 break;
128 case 'q':{
129 int64_t *val = va_arg(ap, int64_t *);
130 __le64 le_val;
131 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
132 errcode = -EFAULT;
133 break;
134 }
135 *val = le64_to_cpu(le_val);
136 }
137 break;
138 case 's':{
139 char **sptr = va_arg(ap, char **);
140 uint16_t len;
141
142 errcode = p9pdu_readf(pdu, proto_version,
143 "w", &len);
144 if (errcode)
145 break;
146
147 *sptr = kmalloc(len + 1, GFP_NOFS);
148 if (*sptr == NULL) {
149 errcode = -ENOMEM;
150 break;
151 }
152 if (pdu_read(pdu, *sptr, len)) {
153 errcode = -EFAULT;
154 kfree(*sptr);
155 *sptr = NULL;
156 } else
157 (*sptr)[len] = 0;
158 }
159 break;
160 case 'u': {
161 kuid_t *uid = va_arg(ap, kuid_t *);
162 __le32 le_val;
163 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
164 errcode = -EFAULT;
165 break;
166 }
167 *uid = make_kuid(&init_user_ns,
168 le32_to_cpu(le_val));
169 } break;
170 case 'g': {
171 kgid_t *gid = va_arg(ap, kgid_t *);
172 __le32 le_val;
173 if (pdu_read(pdu, &le_val, sizeof(le_val))) {
174 errcode = -EFAULT;
175 break;
176 }
177 *gid = make_kgid(&init_user_ns,
178 le32_to_cpu(le_val));
179 } break;
180 case 'Q':{
181 struct p9_qid *qid =
182 va_arg(ap, struct p9_qid *);
183
184 errcode = p9pdu_readf(pdu, proto_version, "bdq",
185 &qid->type, &qid->version,
186 &qid->path);
187 }
188 break;
189 case 'S':{
190 struct p9_wstat *stbuf =
191 va_arg(ap, struct p9_wstat *);
192
193 memset(stbuf, 0, sizeof(struct p9_wstat));
194 stbuf->n_uid = stbuf->n_muid = INVALID_UID;
195 stbuf->n_gid = INVALID_GID;
196
197 errcode =
198 p9pdu_readf(pdu, proto_version,
199 "wwdQdddqssss?sugu",
200 &stbuf->size, &stbuf->type,
201 &stbuf->dev, &stbuf->qid,
202 &stbuf->mode, &stbuf->atime,
203 &stbuf->mtime, &stbuf->length,
204 &stbuf->name, &stbuf->uid,
205 &stbuf->gid, &stbuf->muid,
206 &stbuf->extension,
207 &stbuf->n_uid, &stbuf->n_gid,
208 &stbuf->n_muid);
209 if (errcode)
210 p9stat_free(stbuf);
211 }
212 break;
213 case 'D':{
214 uint32_t *count = va_arg(ap, uint32_t *);
215 void **data = va_arg(ap, void **);
216
217 errcode =
218 p9pdu_readf(pdu, proto_version, "d", count);
219 if (!errcode) {
220 *count =
221 min_t(uint32_t, *count,
222 pdu->size - pdu->offset);
223 *data = &pdu->sdata[pdu->offset];
224 }
225 }
226 break;
227 case 'T':{
228 uint16_t *nwname = va_arg(ap, uint16_t *);
229 char ***wnames = va_arg(ap, char ***);
230
231 errcode = p9pdu_readf(pdu, proto_version,
232 "w", nwname);
233 if (!errcode) {
234 *wnames =
235 kmalloc_array(*nwname,
236 sizeof(char *),
237 GFP_NOFS);
238 if (!*wnames)
239 errcode = -ENOMEM;
240 }
241
242 if (!errcode) {
243 int i;
244
245 for (i = 0; i < *nwname; i++) {
246 errcode =
247 p9pdu_readf(pdu,
248 proto_version,
249 "s",
250 &(*wnames)[i]);
251 if (errcode)
252 break;
253 }
254 }
255
256 if (errcode) {
257 if (*wnames) {
258 int i;
259
260 for (i = 0; i < *nwname; i++)
261 kfree((*wnames)[i]);
262 }
263 kfree(*wnames);
264 *wnames = NULL;
265 }
266 }
267 break;
268 case 'R':{
269 uint16_t *nwqid = va_arg(ap, uint16_t *);
270 struct p9_qid **wqids =
271 va_arg(ap, struct p9_qid **);
272
273 *wqids = NULL;
274
275 errcode =
276 p9pdu_readf(pdu, proto_version, "w", nwqid);
277 if (!errcode) {
278 *wqids =
279 kmalloc_array(*nwqid,
280 sizeof(struct p9_qid),
281 GFP_NOFS);
282 if (*wqids == NULL)
283 errcode = -ENOMEM;
284 }
285
286 if (!errcode) {
287 int i;
288
289 for (i = 0; i < *nwqid; i++) {
290 errcode =
291 p9pdu_readf(pdu,
292 proto_version,
293 "Q",
294 &(*wqids)[i]);
295 if (errcode)
296 break;
297 }
298 }
299
300 if (errcode) {
301 kfree(*wqids);
302 *wqids = NULL;
303 }
304 }
305 break;
306 case 'A': {
307 struct p9_stat_dotl *stbuf =
308 va_arg(ap, struct p9_stat_dotl *);
309
310 memset(stbuf, 0, sizeof(struct p9_stat_dotl));
311 errcode =
312 p9pdu_readf(pdu, proto_version,
313 "qQdugqqqqqqqqqqqqqqq",
314 &stbuf->st_result_mask,
315 &stbuf->qid,
316 &stbuf->st_mode,
317 &stbuf->st_uid, &stbuf->st_gid,
318 &stbuf->st_nlink,
319 &stbuf->st_rdev, &stbuf->st_size,
320 &stbuf->st_blksize, &stbuf->st_blocks,
321 &stbuf->st_atime_sec,
322 &stbuf->st_atime_nsec,
323 &stbuf->st_mtime_sec,
324 &stbuf->st_mtime_nsec,
325 &stbuf->st_ctime_sec,
326 &stbuf->st_ctime_nsec,
327 &stbuf->st_btime_sec,
328 &stbuf->st_btime_nsec,
329 &stbuf->st_gen,
330 &stbuf->st_data_version);
331 }
332 break;
333 case '?':
334 if ((proto_version != p9_proto_2000u) &&
335 (proto_version != p9_proto_2000L))
336 return 0;
337 break;
338 default:
339 BUG();
340 break;
341 }
342
343 if (errcode)
344 break;
345 }
346
347 return errcode;
348}
349
350int
351p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
352 va_list ap)
353{
354 const char *ptr;
355 int errcode = 0;
356
357 for (ptr = fmt; *ptr; ptr++) {
358 switch (*ptr) {
359 case 'b':{
360 int8_t val = va_arg(ap, int);
361 if (pdu_write(pdu, &val, sizeof(val)))
362 errcode = -EFAULT;
363 }
364 break;
365 case 'w':{
366 __le16 val = cpu_to_le16(va_arg(ap, int));
367 if (pdu_write(pdu, &val, sizeof(val)))
368 errcode = -EFAULT;
369 }
370 break;
371 case 'd':{
372 __le32 val = cpu_to_le32(va_arg(ap, int32_t));
373 if (pdu_write(pdu, &val, sizeof(val)))
374 errcode = -EFAULT;
375 }
376 break;
377 case 'q':{
378 __le64 val = cpu_to_le64(va_arg(ap, int64_t));
379 if (pdu_write(pdu, &val, sizeof(val)))
380 errcode = -EFAULT;
381 }
382 break;
383 case 's':{
384 const char *sptr = va_arg(ap, const char *);
385 uint16_t len = 0;
386 if (sptr)
387 len = min_t(size_t, strlen(sptr),
388 USHRT_MAX);
389
390 errcode = p9pdu_writef(pdu, proto_version,
391 "w", len);
392 if (!errcode && pdu_write(pdu, sptr, len))
393 errcode = -EFAULT;
394 }
395 break;
396 case 'u': {
397 kuid_t uid = va_arg(ap, kuid_t);
398 __le32 val = cpu_to_le32(
399 from_kuid(&init_user_ns, uid));
400 if (pdu_write(pdu, &val, sizeof(val)))
401 errcode = -EFAULT;
402 } break;
403 case 'g': {
404 kgid_t gid = va_arg(ap, kgid_t);
405 __le32 val = cpu_to_le32(
406 from_kgid(&init_user_ns, gid));
407 if (pdu_write(pdu, &val, sizeof(val)))
408 errcode = -EFAULT;
409 } break;
410 case 'Q':{
411 const struct p9_qid *qid =
412 va_arg(ap, const struct p9_qid *);
413 errcode =
414 p9pdu_writef(pdu, proto_version, "bdq",
415 qid->type, qid->version,
416 qid->path);
417 } break;
418 case 'S':{
419 const struct p9_wstat *stbuf =
420 va_arg(ap, const struct p9_wstat *);
421 errcode =
422 p9pdu_writef(pdu, proto_version,
423 "wwdQdddqssss?sugu",
424 stbuf->size, stbuf->type,
425 stbuf->dev, &stbuf->qid,
426 stbuf->mode, stbuf->atime,
427 stbuf->mtime, stbuf->length,
428 stbuf->name, stbuf->uid,
429 stbuf->gid, stbuf->muid,
430 stbuf->extension, stbuf->n_uid,
431 stbuf->n_gid, stbuf->n_muid);
432 } break;
433 case 'V':{
434 uint32_t count = va_arg(ap, uint32_t);
435 struct iov_iter *from =
436 va_arg(ap, struct iov_iter *);
437 errcode = p9pdu_writef(pdu, proto_version, "d",
438 count);
439 if (!errcode && pdu_write_u(pdu, from, count))
440 errcode = -EFAULT;
441 }
442 break;
443 case 'T':{
444 uint16_t nwname = va_arg(ap, int);
445 const char **wnames = va_arg(ap, const char **);
446
447 errcode = p9pdu_writef(pdu, proto_version, "w",
448 nwname);
449 if (!errcode) {
450 int i;
451
452 for (i = 0; i < nwname; i++) {
453 errcode =
454 p9pdu_writef(pdu,
455 proto_version,
456 "s",
457 wnames[i]);
458 if (errcode)
459 break;
460 }
461 }
462 }
463 break;
464 case 'R':{
465 uint16_t nwqid = va_arg(ap, int);
466 struct p9_qid *wqids =
467 va_arg(ap, struct p9_qid *);
468
469 errcode = p9pdu_writef(pdu, proto_version, "w",
470 nwqid);
471 if (!errcode) {
472 int i;
473
474 for (i = 0; i < nwqid; i++) {
475 errcode =
476 p9pdu_writef(pdu,
477 proto_version,
478 "Q",
479 &wqids[i]);
480 if (errcode)
481 break;
482 }
483 }
484 }
485 break;
486 case 'I':{
487 struct p9_iattr_dotl *p9attr = va_arg(ap,
488 struct p9_iattr_dotl *);
489
490 errcode = p9pdu_writef(pdu, proto_version,
491 "ddugqqqqq",
492 p9attr->valid,
493 p9attr->mode,
494 p9attr->uid,
495 p9attr->gid,
496 p9attr->size,
497 p9attr->atime_sec,
498 p9attr->atime_nsec,
499 p9attr->mtime_sec,
500 p9attr->mtime_nsec);
501 }
502 break;
503 case '?':
504 if ((proto_version != p9_proto_2000u) &&
505 (proto_version != p9_proto_2000L))
506 return 0;
507 break;
508 default:
509 BUG();
510 break;
511 }
512
513 if (errcode)
514 break;
515 }
516
517 return errcode;
518}
519
520int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
521{
522 va_list ap;
523 int ret;
524
525 va_start(ap, fmt);
526 ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
527 va_end(ap);
528
529 return ret;
530}
531
532static int
533p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
534{
535 va_list ap;
536 int ret;
537
538 va_start(ap, fmt);
539 ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
540 va_end(ap);
541
542 return ret;
543}
544
545int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st)
546{
547 struct p9_fcall fake_pdu;
548 int ret;
549
550 fake_pdu.size = len;
551 fake_pdu.capacity = len;
552 fake_pdu.sdata = buf;
553 fake_pdu.offset = 0;
554
555 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st);
556 if (ret) {
557 p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
558 trace_9p_protocol_dump(clnt, &fake_pdu);
559 return ret;
560 }
561
562 return fake_pdu.offset;
563}
564EXPORT_SYMBOL(p9stat_read);
565
566int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
567{
568 pdu->id = type;
569 return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
570}
571
572int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu)
573{
574 int size = pdu->size;
575 int err;
576
577 pdu->size = 0;
578 err = p9pdu_writef(pdu, 0, "d", size);
579 pdu->size = size;
580
581 trace_9p_protocol_dump(clnt, pdu);
582 p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n",
583 pdu->size, pdu->id, pdu->tag);
584
585 return err;
586}
587
588void p9pdu_reset(struct p9_fcall *pdu)
589{
590 pdu->offset = 0;
591 pdu->size = 0;
592}
593
594int p9dirent_read(struct p9_client *clnt, char *buf, int len,
595 struct p9_dirent *dirent)
596{
597 struct p9_fcall fake_pdu;
598 int ret;
599 char *nameptr;
600
601 fake_pdu.size = len;
602 fake_pdu.capacity = len;
603 fake_pdu.sdata = buf;
604 fake_pdu.offset = 0;
605
606 ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid,
607 &dirent->d_off, &dirent->d_type, &nameptr);
608 if (ret) {
609 p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
610 trace_9p_protocol_dump(clnt, &fake_pdu);
611 return ret;
612 }
613
614 ret = strscpy(dirent->d_name, nameptr, sizeof(dirent->d_name));
615 if (ret < 0) {
616 p9_debug(P9_DEBUG_ERROR,
617 "On the wire dirent name too long: %s\n",
618 nameptr);
619 kfree(nameptr);
620 return ret;
621 }
622 kfree(nameptr);
623
624 return fake_pdu.offset;
625}
626EXPORT_SYMBOL(p9dirent_read);