1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
5 */
6
7 #include <linux/moduleparam.h>
8
9 #include "glob.h"
10 #include "oplock.h"
11
12 #include "smb_common.h"
13 #include "../common/smb2status.h"
14 #include "connection.h"
15 #include "mgmt/user_session.h"
16 #include "mgmt/share_config.h"
17 #include "mgmt/tree_connect.h"
18
19 static LIST_HEAD(lease_table_list);
20 static DEFINE_RWLOCK(lease_list_lock);
21
22 /**
23 * alloc_opinfo() - allocate a new opinfo object for oplock info
24 * @work: smb work
25 * @id: fid of open file
26 * @Tid: tree id of connection
27 *
28 * Return: allocated opinfo object on success, otherwise NULL
29 */
alloc_opinfo(struct ksmbd_work * work,u64 id,__u16 Tid)30 static struct oplock_info *alloc_opinfo(struct ksmbd_work *work,
31 u64 id, __u16 Tid)
32 {
33 struct ksmbd_session *sess = work->sess;
34 struct oplock_info *opinfo;
35
36 opinfo = kzalloc_obj(struct oplock_info, KSMBD_DEFAULT_GFP);
37 if (!opinfo)
38 return NULL;
39
40 opinfo->sess = sess;
41 opinfo->conn = ksmbd_conn_get(work->conn);
42 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
43 opinfo->op_state = OPLOCK_STATE_NONE;
44 opinfo->pending_break = 0;
45 opinfo->fid = id;
46 opinfo->Tid = Tid;
47 INIT_LIST_HEAD(&opinfo->op_entry);
48 init_waitqueue_head(&opinfo->oplock_q);
49 init_waitqueue_head(&opinfo->oplock_brk);
50 atomic_set(&opinfo->refcount, 1);
51 atomic_set(&opinfo->breaking_cnt, 0);
52
53 return opinfo;
54 }
55
lease_add_list(struct oplock_info * opinfo)56 static void lease_add_list(struct oplock_info *opinfo)
57 {
58 struct lease_table *lb = opinfo->o_lease->l_lb;
59
60 spin_lock(&lb->lb_lock);
61 list_add_rcu(&opinfo->lease_entry, &lb->lease_list);
62 spin_unlock(&lb->lb_lock);
63 }
64
lease_del_list(struct oplock_info * opinfo)65 static void lease_del_list(struct oplock_info *opinfo)
66 {
67 struct lease_table *lb = opinfo->o_lease->l_lb;
68
69 if (!lb)
70 return;
71
72 spin_lock(&lb->lb_lock);
73 if (list_empty(&opinfo->lease_entry)) {
74 spin_unlock(&lb->lb_lock);
75 return;
76 }
77
78 list_del_init(&opinfo->lease_entry);
79 opinfo->o_lease->l_lb = NULL;
80 spin_unlock(&lb->lb_lock);
81 }
82
alloc_lease_table(struct oplock_info * opinfo)83 static struct lease_table *alloc_lease_table(struct oplock_info *opinfo)
84 {
85 struct lease_table *lb;
86
87 lb = kmalloc_obj(struct lease_table, KSMBD_DEFAULT_GFP);
88 if (!lb)
89 return NULL;
90
91 memcpy(lb->client_guid, opinfo->conn->ClientGUID,
92 SMB2_CLIENT_GUID_SIZE);
93 INIT_LIST_HEAD(&lb->lease_list);
94 spin_lock_init(&lb->lb_lock);
95 return lb;
96 }
97
alloc_lease(struct oplock_info * opinfo,struct lease_ctx_info * lctx)98 static int alloc_lease(struct oplock_info *opinfo, struct lease_ctx_info *lctx)
99 {
100 struct lease *lease;
101
102 lease = kmalloc_obj(struct lease, KSMBD_DEFAULT_GFP);
103 if (!lease)
104 return -ENOMEM;
105
106 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
107 lease->state = lctx->req_state;
108 lease->new_state = 0;
109 lease->flags = lctx->flags;
110 lease->duration = lctx->duration;
111 lease->is_dir = lctx->is_dir;
112 memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE);
113 lease->version = lctx->version;
114 lease->epoch = le16_to_cpu(lctx->epoch) + 1;
115 INIT_LIST_HEAD(&opinfo->lease_entry);
116 opinfo->o_lease = lease;
117
118 return 0;
119 }
120
free_lease(struct oplock_info * opinfo)121 static void free_lease(struct oplock_info *opinfo)
122 {
123 struct lease *lease;
124
125 lease = opinfo->o_lease;
126 kfree(lease);
127 }
128
__free_opinfo(struct oplock_info * opinfo)129 static void __free_opinfo(struct oplock_info *opinfo)
130 {
131 if (opinfo->is_lease)
132 free_lease(opinfo);
133 ksmbd_conn_put(opinfo->conn);
134 kfree(opinfo);
135 }
136
free_opinfo_rcu(struct rcu_head * rcu)137 static void free_opinfo_rcu(struct rcu_head *rcu)
138 {
139 struct oplock_info *opinfo = container_of(rcu, struct oplock_info, rcu);
140
141 __free_opinfo(opinfo);
142 }
143
free_opinfo(struct oplock_info * opinfo)144 static void free_opinfo(struct oplock_info *opinfo)
145 {
146 call_rcu(&opinfo->rcu, free_opinfo_rcu);
147 }
148
opinfo_get(struct ksmbd_file * fp)149 struct oplock_info *opinfo_get(struct ksmbd_file *fp)
150 {
151 struct oplock_info *opinfo;
152
153 rcu_read_lock();
154 opinfo = rcu_dereference(fp->f_opinfo);
155 if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
156 opinfo = NULL;
157 rcu_read_unlock();
158
159 return opinfo;
160 }
161
opinfo_get_list(struct ksmbd_inode * ci)162 static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci)
163 {
164 struct oplock_info *opinfo;
165
166 down_read(&ci->m_lock);
167 opinfo = list_first_entry_or_null(&ci->m_op_list, struct oplock_info,
168 op_entry);
169 if (opinfo) {
170 if (opinfo->conn == NULL ||
171 !atomic_inc_not_zero(&opinfo->refcount))
172 opinfo = NULL;
173 else {
174 if (ksmbd_conn_releasing(opinfo->conn)) {
175 atomic_dec(&opinfo->refcount);
176 opinfo = NULL;
177 }
178 }
179 }
180 up_read(&ci->m_lock);
181
182 return opinfo;
183 }
184
opinfo_put(struct oplock_info * opinfo)185 void opinfo_put(struct oplock_info *opinfo)
186 {
187 if (!opinfo)
188 return;
189
190 if (!atomic_dec_and_test(&opinfo->refcount))
191 return;
192
193 free_opinfo(opinfo);
194 }
195
opinfo_add(struct oplock_info * opinfo,struct ksmbd_file * fp)196 static void opinfo_add(struct oplock_info *opinfo, struct ksmbd_file *fp)
197 {
198 struct ksmbd_inode *ci = fp->f_ci;
199
200 down_write(&ci->m_lock);
201 list_add(&opinfo->op_entry, &ci->m_op_list);
202 up_write(&ci->m_lock);
203 }
204
opinfo_del(struct oplock_info * opinfo)205 static void opinfo_del(struct oplock_info *opinfo)
206 {
207 struct ksmbd_inode *ci = opinfo->o_fp->f_ci;
208
209 if (opinfo->is_lease) {
210 write_lock(&lease_list_lock);
211 lease_del_list(opinfo);
212 write_unlock(&lease_list_lock);
213 }
214 down_write(&ci->m_lock);
215 list_del(&opinfo->op_entry);
216 up_write(&ci->m_lock);
217 }
218
opinfo_count(struct ksmbd_file * fp)219 static unsigned long opinfo_count(struct ksmbd_file *fp)
220 {
221 if (ksmbd_stream_fd(fp))
222 return atomic_read(&fp->f_ci->sop_count);
223 else
224 return atomic_read(&fp->f_ci->op_count);
225 }
226
opinfo_count_inc(struct ksmbd_file * fp)227 static void opinfo_count_inc(struct ksmbd_file *fp)
228 {
229 if (ksmbd_stream_fd(fp))
230 return atomic_inc(&fp->f_ci->sop_count);
231 else
232 return atomic_inc(&fp->f_ci->op_count);
233 }
234
opinfo_count_dec(struct ksmbd_file * fp)235 static void opinfo_count_dec(struct ksmbd_file *fp)
236 {
237 if (ksmbd_stream_fd(fp))
238 return atomic_dec(&fp->f_ci->sop_count);
239 else
240 return atomic_dec(&fp->f_ci->op_count);
241 }
242
243 /**
244 * opinfo_write_to_read() - convert a write oplock to read oplock
245 * @opinfo: current oplock info
246 *
247 * Return: 0 on success, otherwise -EINVAL
248 */
opinfo_write_to_read(struct oplock_info * opinfo)249 int opinfo_write_to_read(struct oplock_info *opinfo)
250 {
251 struct lease *lease = opinfo->o_lease;
252
253 if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
254 opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
255 pr_err("bad oplock(0x%x)\n", opinfo->level);
256 if (opinfo->is_lease)
257 pr_err("lease state(0x%x)\n", lease->state);
258 return -EINVAL;
259 }
260 opinfo->level = SMB2_OPLOCK_LEVEL_II;
261
262 if (opinfo->is_lease)
263 lease->state = lease->new_state;
264 return 0;
265 }
266
267 /**
268 * opinfo_read_handle_to_read() - convert a read/handle oplock to read oplock
269 * @opinfo: current oplock info
270 *
271 * Return: 0 on success, otherwise -EINVAL
272 */
opinfo_read_handle_to_read(struct oplock_info * opinfo)273 int opinfo_read_handle_to_read(struct oplock_info *opinfo)
274 {
275 struct lease *lease = opinfo->o_lease;
276
277 lease->state = lease->new_state;
278 opinfo->level = SMB2_OPLOCK_LEVEL_II;
279 return 0;
280 }
281
282 /**
283 * opinfo_write_to_none() - convert a write oplock to none
284 * @opinfo: current oplock info
285 *
286 * Return: 0 on success, otherwise -EINVAL
287 */
opinfo_write_to_none(struct oplock_info * opinfo)288 int opinfo_write_to_none(struct oplock_info *opinfo)
289 {
290 struct lease *lease = opinfo->o_lease;
291
292 if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
293 opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
294 pr_err("bad oplock(0x%x)\n", opinfo->level);
295 if (opinfo->is_lease)
296 pr_err("lease state(0x%x)\n", lease->state);
297 return -EINVAL;
298 }
299 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
300 if (opinfo->is_lease)
301 lease->state = lease->new_state;
302 return 0;
303 }
304
305 /**
306 * opinfo_read_to_none() - convert a write read to none
307 * @opinfo: current oplock info
308 *
309 * Return: 0 on success, otherwise -EINVAL
310 */
opinfo_read_to_none(struct oplock_info * opinfo)311 int opinfo_read_to_none(struct oplock_info *opinfo)
312 {
313 struct lease *lease = opinfo->o_lease;
314
315 if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
316 pr_err("bad oplock(0x%x)\n", opinfo->level);
317 if (opinfo->is_lease)
318 pr_err("lease state(0x%x)\n", lease->state);
319 return -EINVAL;
320 }
321 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
322 if (opinfo->is_lease)
323 lease->state = lease->new_state;
324 return 0;
325 }
326
327 /**
328 * lease_read_to_write() - upgrade lease state from read to write
329 * @opinfo: current lease info
330 *
331 * Return: 0 on success, otherwise -EINVAL
332 */
lease_read_to_write(struct oplock_info * opinfo)333 int lease_read_to_write(struct oplock_info *opinfo)
334 {
335 struct lease *lease = opinfo->o_lease;
336
337 if (!(lease->state & SMB2_LEASE_READ_CACHING_LE)) {
338 ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
339 return -EINVAL;
340 }
341
342 lease->new_state = SMB2_LEASE_NONE_LE;
343 lease->state |= SMB2_LEASE_WRITE_CACHING_LE;
344 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
345 opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
346 else
347 opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
348 return 0;
349 }
350
351 /**
352 * lease_none_upgrade() - upgrade lease state from none
353 * @opinfo: current lease info
354 * @new_state: new lease state
355 *
356 * Return: 0 on success, otherwise -EINVAL
357 */
lease_none_upgrade(struct oplock_info * opinfo,__le32 new_state)358 static int lease_none_upgrade(struct oplock_info *opinfo, __le32 new_state)
359 {
360 struct lease *lease = opinfo->o_lease;
361
362 if (!(lease->state == SMB2_LEASE_NONE_LE)) {
363 ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
364 return -EINVAL;
365 }
366
367 lease->new_state = SMB2_LEASE_NONE_LE;
368 lease->state = new_state;
369 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
370 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
371 opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
372 else
373 opinfo->level = SMB2_OPLOCK_LEVEL_II;
374 else if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
375 opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
376 else if (lease->state & SMB2_LEASE_READ_CACHING_LE)
377 opinfo->level = SMB2_OPLOCK_LEVEL_II;
378
379 return 0;
380 }
381
382 /**
383 * close_id_del_oplock() - release oplock object at file close time
384 * @fp: ksmbd file pointer
385 */
close_id_del_oplock(struct ksmbd_file * fp)386 void close_id_del_oplock(struct ksmbd_file *fp)
387 {
388 struct oplock_info *opinfo;
389
390 if (fp->reserve_lease_break)
391 smb_lazy_parent_lease_break_close(fp);
392
393 opinfo = opinfo_get(fp);
394 if (!opinfo)
395 return;
396
397 opinfo_del(opinfo);
398
399 rcu_assign_pointer(fp->f_opinfo, NULL);
400 if (opinfo->op_state == OPLOCK_ACK_WAIT) {
401 opinfo->op_state = OPLOCK_CLOSING;
402 wake_up_interruptible_all(&opinfo->oplock_q);
403 if (opinfo->is_lease) {
404 atomic_set(&opinfo->breaking_cnt, 0);
405 wake_up_interruptible_all(&opinfo->oplock_brk);
406 }
407 }
408
409 opinfo_count_dec(fp);
410 atomic_dec(&opinfo->refcount);
411 opinfo_put(opinfo);
412 }
413
414 /**
415 * grant_write_oplock() - grant exclusive/batch oplock or write lease
416 * @opinfo_new: new oplock info object
417 * @req_oplock: request oplock
418 * @lctx: lease context information
419 *
420 * Return: 0
421 */
grant_write_oplock(struct oplock_info * opinfo_new,int req_oplock,struct lease_ctx_info * lctx)422 static void grant_write_oplock(struct oplock_info *opinfo_new, int req_oplock,
423 struct lease_ctx_info *lctx)
424 {
425 struct lease *lease = opinfo_new->o_lease;
426
427 if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
428 opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
429 else
430 opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
431
432 if (lctx) {
433 lease->state = lctx->req_state;
434 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
435 }
436 }
437
438 /**
439 * grant_read_oplock() - grant level2 oplock or read lease
440 * @opinfo_new: new oplock info object
441 * @lctx: lease context information
442 *
443 * Return: 0
444 */
grant_read_oplock(struct oplock_info * opinfo_new,struct lease_ctx_info * lctx)445 static void grant_read_oplock(struct oplock_info *opinfo_new,
446 struct lease_ctx_info *lctx)
447 {
448 struct lease *lease = opinfo_new->o_lease;
449
450 opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
451
452 if (lctx) {
453 lease->state = SMB2_LEASE_READ_CACHING_LE;
454 if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING_LE)
455 lease->state |= SMB2_LEASE_HANDLE_CACHING_LE;
456 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
457 }
458 }
459
460 /**
461 * grant_none_oplock() - grant none oplock or none lease
462 * @opinfo_new: new oplock info object
463 * @lctx: lease context information
464 *
465 * Return: 0
466 */
grant_none_oplock(struct oplock_info * opinfo_new,struct lease_ctx_info * lctx)467 static void grant_none_oplock(struct oplock_info *opinfo_new,
468 struct lease_ctx_info *lctx)
469 {
470 struct lease *lease = opinfo_new->o_lease;
471
472 opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
473
474 if (lctx) {
475 lease->state = 0;
476 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
477 }
478 }
479
compare_guid_key(struct oplock_info * opinfo,const char * guid1,const char * key1)480 static inline int compare_guid_key(struct oplock_info *opinfo,
481 const char *guid1, const char *key1)
482 {
483 const char *guid2, *key2;
484 struct ksmbd_conn *conn;
485
486 conn = READ_ONCE(opinfo->conn);
487 if (!conn)
488 return 0;
489 guid2 = conn->ClientGUID;
490 key2 = opinfo->o_lease->lease_key;
491 if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) &&
492 !memcmp(key1, key2, SMB2_LEASE_KEY_SIZE))
493 return 1;
494
495 return 0;
496 }
497
498 /**
499 * same_client_has_lease() - check whether current lease request is
500 * from lease owner of file
501 * @ci: master file pointer
502 * @client_guid: Client GUID
503 * @lctx: lease context information
504 *
505 * Return: oplock(lease) object on success, otherwise NULL
506 */
same_client_has_lease(struct ksmbd_inode * ci,char * client_guid,struct lease_ctx_info * lctx)507 static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci,
508 char *client_guid,
509 struct lease_ctx_info *lctx)
510 {
511 int ret;
512 struct lease *lease;
513 struct oplock_info *opinfo;
514 struct oplock_info *m_opinfo = NULL;
515
516 if (!lctx)
517 return NULL;
518
519 /*
520 * Compare lease key and client_guid to know request from same owner
521 * of same client
522 */
523 down_read(&ci->m_lock);
524 list_for_each_entry(opinfo, &ci->m_op_list, op_entry) {
525 if (!opinfo->is_lease || !opinfo->conn)
526 continue;
527 lease = opinfo->o_lease;
528
529 ret = compare_guid_key(opinfo, client_guid, lctx->lease_key);
530 if (ret) {
531 m_opinfo = opinfo;
532 /* skip upgrading lease about breaking lease */
533 if (atomic_read(&opinfo->breaking_cnt))
534 continue;
535
536 /* upgrading lease */
537 if ((atomic_read(&ci->op_count) +
538 atomic_read(&ci->sop_count)) == 1) {
539 if (lease->state != SMB2_LEASE_NONE_LE &&
540 lease->state == (lctx->req_state & lease->state)) {
541 lease->epoch++;
542 lease->state |= lctx->req_state;
543 if (lctx->req_state &
544 SMB2_LEASE_WRITE_CACHING_LE)
545 lease_read_to_write(opinfo);
546
547 }
548 } else if ((atomic_read(&ci->op_count) +
549 atomic_read(&ci->sop_count)) > 1) {
550 if (lctx->req_state ==
551 (SMB2_LEASE_READ_CACHING_LE |
552 SMB2_LEASE_HANDLE_CACHING_LE)) {
553 lease->epoch++;
554 lease->state = lctx->req_state;
555 }
556 }
557
558 if (lctx->req_state && lease->state ==
559 SMB2_LEASE_NONE_LE) {
560 lease->epoch++;
561 lease_none_upgrade(opinfo, lctx->req_state);
562 }
563 }
564 }
565 up_read(&ci->m_lock);
566
567 return m_opinfo;
568 }
569
wait_for_break_ack(struct oplock_info * opinfo)570 static void wait_for_break_ack(struct oplock_info *opinfo)
571 {
572 int rc = 0;
573
574 rc = wait_event_interruptible_timeout(opinfo->oplock_q,
575 opinfo->op_state == OPLOCK_STATE_NONE ||
576 opinfo->op_state == OPLOCK_CLOSING,
577 OPLOCK_WAIT_TIME);
578
579 /* is this a timeout ? */
580 if (!rc) {
581 if (opinfo->is_lease)
582 opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
583 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
584 opinfo->op_state = OPLOCK_STATE_NONE;
585 }
586 }
587
wake_up_oplock_break(struct oplock_info * opinfo)588 static void wake_up_oplock_break(struct oplock_info *opinfo)
589 {
590 clear_bit_unlock(0, &opinfo->pending_break);
591 /* memory barrier is needed for wake_up_bit() */
592 smp_mb__after_atomic();
593 wake_up_bit(&opinfo->pending_break, 0);
594 }
595
oplock_break_pending(struct oplock_info * opinfo,int req_op_level)596 static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level)
597 {
598 while (test_and_set_bit(0, &opinfo->pending_break)) {
599 wait_on_bit(&opinfo->pending_break, 0, TASK_UNINTERRUPTIBLE);
600
601 /* Not immediately break to none. */
602 opinfo->open_trunc = 0;
603
604 if (opinfo->op_state == OPLOCK_CLOSING)
605 return -ENOENT;
606 else if (opinfo->level <= req_op_level) {
607 if (opinfo->is_lease == false)
608 return 1;
609
610 if (opinfo->o_lease->state !=
611 (SMB2_LEASE_HANDLE_CACHING_LE |
612 SMB2_LEASE_READ_CACHING_LE))
613 return 1;
614 }
615 }
616
617 if (opinfo->level <= req_op_level) {
618 if (opinfo->is_lease == false) {
619 wake_up_oplock_break(opinfo);
620 return 1;
621 }
622 if (opinfo->o_lease->state !=
623 (SMB2_LEASE_HANDLE_CACHING_LE |
624 SMB2_LEASE_READ_CACHING_LE)) {
625 wake_up_oplock_break(opinfo);
626 return 1;
627 }
628 }
629 return 0;
630 }
631
632 /**
633 * __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn
634 * to client
635 * @wk: smb work object
636 *
637 * There are two ways this function can be called. 1- while file open we break
638 * from exclusive/batch lock to levelII oplock and 2- while file write/truncate
639 * we break from levelII oplock no oplock.
640 * work->request_buf contains oplock_info.
641 */
__smb2_oplock_break_noti(struct work_struct * wk)642 static void __smb2_oplock_break_noti(struct work_struct *wk)
643 {
644 struct smb2_oplock_break *rsp = NULL;
645 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
646 struct ksmbd_conn *conn = work->conn;
647 struct oplock_break_info *br_info = work->request_buf;
648 struct smb2_hdr *rsp_hdr;
649 struct ksmbd_file *fp;
650
651 fp = ksmbd_lookup_global_fd(br_info->fid);
652 if (!fp)
653 goto out;
654
655 if (allocate_interim_rsp_buf(work)) {
656 pr_err("smb2_allocate_rsp_buf failed! ");
657 ksmbd_fd_put(work, fp);
658 goto out;
659 }
660
661 rsp_hdr = smb_get_msg(work->response_buf);
662 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
663 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
664 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
665 rsp_hdr->CreditRequest = cpu_to_le16(0);
666 rsp_hdr->Command = SMB2_OPLOCK_BREAK;
667 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
668 rsp_hdr->NextCommand = 0;
669 rsp_hdr->MessageId = cpu_to_le64(-1);
670 rsp_hdr->Id.SyncId.ProcessId = 0;
671 rsp_hdr->Id.SyncId.TreeId = 0;
672 rsp_hdr->SessionId = 0;
673 memset(rsp_hdr->Signature, 0, 16);
674
675 rsp = smb_get_msg(work->response_buf);
676
677 rsp->StructureSize = cpu_to_le16(24);
678 if (!br_info->open_trunc &&
679 (br_info->level == SMB2_OPLOCK_LEVEL_BATCH ||
680 br_info->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
681 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_II;
682 else
683 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE;
684 rsp->Reserved = 0;
685 rsp->Reserved2 = 0;
686 rsp->PersistentFid = fp->persistent_id;
687 rsp->VolatileFid = fp->volatile_id;
688
689 ksmbd_fd_put(work, fp);
690 if (ksmbd_iov_pin_rsp(work, (void *)rsp,
691 sizeof(struct smb2_oplock_break)))
692 goto out;
693
694 ksmbd_debug(OPLOCK,
695 "sending oplock break v_id %llu p_id = %llu lock level = %d\n",
696 rsp->VolatileFid, rsp->PersistentFid, rsp->OplockLevel);
697
698 ksmbd_conn_write(work);
699
700 out:
701 ksmbd_free_work_struct(work);
702 ksmbd_conn_r_count_dec(conn);
703 }
704
705 /**
706 * smb2_oplock_break_noti() - send smb2 exclusive/batch to level2 oplock
707 * break command from server to client
708 * @opinfo: oplock info object
709 *
710 * Return: 0 on success, otherwise error
711 */
smb2_oplock_break_noti(struct oplock_info * opinfo)712 static int smb2_oplock_break_noti(struct oplock_info *opinfo)
713 {
714 struct ksmbd_conn *conn = opinfo->conn;
715 struct oplock_break_info *br_info;
716 int ret = 0;
717 struct ksmbd_work *work = ksmbd_alloc_work_struct();
718
719 if (!work)
720 return -ENOMEM;
721
722 br_info = kmalloc_obj(struct oplock_break_info, KSMBD_DEFAULT_GFP);
723 if (!br_info) {
724 ksmbd_free_work_struct(work);
725 return -ENOMEM;
726 }
727
728 br_info->level = opinfo->level;
729 br_info->fid = opinfo->fid;
730 br_info->open_trunc = opinfo->open_trunc;
731
732 work->request_buf = (char *)br_info;
733 work->conn = conn;
734 work->sess = opinfo->sess;
735
736 ksmbd_conn_r_count_inc(conn);
737 if (opinfo->op_state == OPLOCK_ACK_WAIT) {
738 INIT_WORK(&work->work, __smb2_oplock_break_noti);
739 ksmbd_queue_work(work);
740
741 wait_for_break_ack(opinfo);
742 } else {
743 __smb2_oplock_break_noti(&work->work);
744 if (opinfo->level == SMB2_OPLOCK_LEVEL_II)
745 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
746 }
747 return ret;
748 }
749
750 /**
751 * __smb2_lease_break_noti() - send lease break command from server
752 * to client
753 * @wk: smb work object
754 */
__smb2_lease_break_noti(struct work_struct * wk)755 static void __smb2_lease_break_noti(struct work_struct *wk)
756 {
757 struct smb2_lease_break *rsp = NULL;
758 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
759 struct ksmbd_conn *conn = work->conn;
760 struct lease_break_info *br_info = work->request_buf;
761 struct smb2_hdr *rsp_hdr;
762
763 if (allocate_interim_rsp_buf(work)) {
764 ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! ");
765 goto out;
766 }
767
768 rsp_hdr = smb_get_msg(work->response_buf);
769 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
770 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
771 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
772 rsp_hdr->CreditRequest = cpu_to_le16(0);
773 rsp_hdr->Command = SMB2_OPLOCK_BREAK;
774 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
775 rsp_hdr->NextCommand = 0;
776 rsp_hdr->MessageId = cpu_to_le64(-1);
777 rsp_hdr->Id.SyncId.ProcessId = 0;
778 rsp_hdr->Id.SyncId.TreeId = 0;
779 rsp_hdr->SessionId = 0;
780 memset(rsp_hdr->Signature, 0, 16);
781
782 rsp = smb_get_msg(work->response_buf);
783 rsp->StructureSize = cpu_to_le16(44);
784 rsp->Epoch = br_info->epoch;
785 rsp->Flags = 0;
786
787 if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING_LE |
788 SMB2_LEASE_HANDLE_CACHING_LE))
789 rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
790
791 memcpy(rsp->LeaseKey, br_info->lease_key, SMB2_LEASE_KEY_SIZE);
792 rsp->CurrentLeaseState = br_info->curr_state;
793 rsp->NewLeaseState = br_info->new_state;
794 rsp->BreakReason = 0;
795 rsp->AccessMaskHint = 0;
796 rsp->ShareMaskHint = 0;
797
798 if (ksmbd_iov_pin_rsp(work, (void *)rsp,
799 sizeof(struct smb2_lease_break)))
800 goto out;
801
802 ksmbd_conn_write(work);
803
804 out:
805 ksmbd_free_work_struct(work);
806 ksmbd_conn_r_count_dec(conn);
807 }
808
809 /**
810 * smb2_lease_break_noti() - break lease when a new client request
811 * write lease
812 * @opinfo: contains lease state information
813 *
814 * Return: 0 on success, otherwise error
815 */
smb2_lease_break_noti(struct oplock_info * opinfo)816 static int smb2_lease_break_noti(struct oplock_info *opinfo)
817 {
818 struct ksmbd_conn *conn = opinfo->conn;
819 struct ksmbd_work *work;
820 struct lease_break_info *br_info;
821 struct lease *lease = opinfo->o_lease;
822
823 work = ksmbd_alloc_work_struct();
824 if (!work)
825 return -ENOMEM;
826
827 br_info = kmalloc_obj(struct lease_break_info, KSMBD_DEFAULT_GFP);
828 if (!br_info) {
829 ksmbd_free_work_struct(work);
830 return -ENOMEM;
831 }
832
833 br_info->curr_state = lease->state;
834 br_info->new_state = lease->new_state;
835 if (lease->version == 2)
836 br_info->epoch = cpu_to_le16(++lease->epoch);
837 else
838 br_info->epoch = 0;
839 memcpy(br_info->lease_key, lease->lease_key, SMB2_LEASE_KEY_SIZE);
840
841 work->request_buf = (char *)br_info;
842 work->conn = conn;
843 work->sess = opinfo->sess;
844
845 ksmbd_conn_r_count_inc(conn);
846 if (opinfo->op_state == OPLOCK_ACK_WAIT) {
847 INIT_WORK(&work->work, __smb2_lease_break_noti);
848 ksmbd_queue_work(work);
849 wait_for_break_ack(opinfo);
850 } else {
851 __smb2_lease_break_noti(&work->work);
852 if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) {
853 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
854 opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
855 }
856 }
857 return 0;
858 }
859
wait_lease_breaking(struct oplock_info * opinfo)860 static void wait_lease_breaking(struct oplock_info *opinfo)
861 {
862 if (!opinfo->is_lease)
863 return;
864
865 wake_up_interruptible_all(&opinfo->oplock_brk);
866 if (atomic_read(&opinfo->breaking_cnt)) {
867 int ret = 0;
868
869 ret = wait_event_interruptible_timeout(opinfo->oplock_brk,
870 atomic_read(&opinfo->breaking_cnt) == 0,
871 HZ);
872 if (!ret)
873 atomic_set(&opinfo->breaking_cnt, 0);
874 }
875 }
876
oplock_break(struct oplock_info * brk_opinfo,int req_op_level,struct ksmbd_work * in_work)877 static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level,
878 struct ksmbd_work *in_work)
879 {
880 int err = 0;
881
882 /* Need to break exclusive/batch oplock, write lease or overwrite_if */
883 ksmbd_debug(OPLOCK,
884 "request to send oplock(level : 0x%x) break notification\n",
885 brk_opinfo->level);
886
887 if (brk_opinfo->is_lease) {
888 struct lease *lease = brk_opinfo->o_lease;
889
890 atomic_inc(&brk_opinfo->breaking_cnt);
891 err = oplock_break_pending(brk_opinfo, req_op_level);
892 if (err)
893 return err < 0 ? err : 0;
894
895 if (brk_opinfo->open_trunc) {
896 /*
897 * Create overwrite break trigger the lease break to
898 * none.
899 */
900 lease->new_state = SMB2_LEASE_NONE_LE;
901 } else {
902 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) {
903 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
904 lease->new_state =
905 SMB2_LEASE_READ_CACHING_LE |
906 SMB2_LEASE_HANDLE_CACHING_LE;
907 else
908 lease->new_state =
909 SMB2_LEASE_READ_CACHING_LE;
910 } else {
911 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE &&
912 !lease->is_dir)
913 lease->new_state =
914 SMB2_LEASE_READ_CACHING_LE;
915 else
916 lease->new_state = SMB2_LEASE_NONE_LE;
917 }
918 }
919
920 if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE |
921 SMB2_LEASE_HANDLE_CACHING_LE)) {
922 if (in_work) {
923 setup_async_work(in_work, NULL, NULL);
924 smb2_send_interim_resp(in_work, STATUS_PENDING);
925 release_async_work(in_work);
926 }
927
928 brk_opinfo->op_state = OPLOCK_ACK_WAIT;
929 } else
930 atomic_dec(&brk_opinfo->breaking_cnt);
931 } else {
932 err = oplock_break_pending(brk_opinfo, req_op_level);
933 if (err)
934 return err < 0 ? err : 0;
935
936 if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
937 brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
938 brk_opinfo->op_state = OPLOCK_ACK_WAIT;
939 }
940
941 if (brk_opinfo->is_lease)
942 err = smb2_lease_break_noti(brk_opinfo);
943 else
944 err = smb2_oplock_break_noti(brk_opinfo);
945
946 ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level);
947 if (brk_opinfo->op_state == OPLOCK_CLOSING)
948 err = -ENOENT;
949 wake_up_oplock_break(brk_opinfo);
950
951 wait_lease_breaking(brk_opinfo);
952
953 return err;
954 }
955
destroy_lease_table(struct ksmbd_conn * conn)956 void destroy_lease_table(struct ksmbd_conn *conn)
957 {
958 struct lease_table *lb, *lbtmp;
959 struct oplock_info *opinfo;
960
961 write_lock(&lease_list_lock);
962 if (list_empty(&lease_table_list)) {
963 write_unlock(&lease_list_lock);
964 return;
965 }
966
967 list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) {
968 if (conn && memcmp(lb->client_guid, conn->ClientGUID,
969 SMB2_CLIENT_GUID_SIZE))
970 continue;
971 again:
972 rcu_read_lock();
973 list_for_each_entry_rcu(opinfo, &lb->lease_list,
974 lease_entry) {
975 rcu_read_unlock();
976 lease_del_list(opinfo);
977 goto again;
978 }
979 rcu_read_unlock();
980 list_del(&lb->l_entry);
981 kfree(lb);
982 }
983 write_unlock(&lease_list_lock);
984 }
985
find_same_lease_key(struct ksmbd_session * sess,struct ksmbd_inode * ci,struct lease_ctx_info * lctx)986 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
987 struct lease_ctx_info *lctx)
988 {
989 struct oplock_info *opinfo;
990 int err = 0;
991 struct lease_table *lb;
992
993 if (!lctx)
994 return err;
995
996 read_lock(&lease_list_lock);
997 if (list_empty(&lease_table_list)) {
998 read_unlock(&lease_list_lock);
999 return 0;
1000 }
1001
1002 list_for_each_entry(lb, &lease_table_list, l_entry) {
1003 if (!memcmp(lb->client_guid, sess->ClientGUID,
1004 SMB2_CLIENT_GUID_SIZE))
1005 goto found;
1006 }
1007 read_unlock(&lease_list_lock);
1008
1009 return 0;
1010
1011 found:
1012 rcu_read_lock();
1013 list_for_each_entry_rcu(opinfo, &lb->lease_list, lease_entry) {
1014 if (!atomic_inc_not_zero(&opinfo->refcount))
1015 continue;
1016 rcu_read_unlock();
1017 if (opinfo->o_fp->f_ci == ci)
1018 goto op_next;
1019 err = compare_guid_key(opinfo, sess->ClientGUID,
1020 lctx->lease_key);
1021 if (err) {
1022 err = -EINVAL;
1023 ksmbd_debug(OPLOCK,
1024 "found same lease key is already used in other files\n");
1025 opinfo_put(opinfo);
1026 goto out;
1027 }
1028 op_next:
1029 opinfo_put(opinfo);
1030 rcu_read_lock();
1031 }
1032 rcu_read_unlock();
1033
1034 out:
1035 read_unlock(&lease_list_lock);
1036 return err;
1037 }
1038
copy_lease(struct oplock_info * op1,struct oplock_info * op2)1039 static void copy_lease(struct oplock_info *op1, struct oplock_info *op2)
1040 {
1041 struct lease *lease1 = op1->o_lease;
1042 struct lease *lease2 = op2->o_lease;
1043
1044 op2->level = op1->level;
1045 lease2->state = lease1->state;
1046 memcpy(lease2->lease_key, lease1->lease_key,
1047 SMB2_LEASE_KEY_SIZE);
1048 lease2->duration = lease1->duration;
1049 lease2->flags = lease1->flags;
1050 lease2->epoch = lease1->epoch;
1051 lease2->version = lease1->version;
1052 }
1053
add_lease_global_list(struct oplock_info * opinfo,struct lease_table * new_lb)1054 static void add_lease_global_list(struct oplock_info *opinfo,
1055 struct lease_table *new_lb)
1056 {
1057 struct lease_table *lb;
1058
1059 write_lock(&lease_list_lock);
1060 list_for_each_entry(lb, &lease_table_list, l_entry) {
1061 if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID,
1062 SMB2_CLIENT_GUID_SIZE)) {
1063 opinfo->o_lease->l_lb = lb;
1064 lease_add_list(opinfo);
1065 write_unlock(&lease_list_lock);
1066 kfree(new_lb);
1067 return;
1068 }
1069 }
1070
1071 opinfo->o_lease->l_lb = new_lb;
1072 lease_add_list(opinfo);
1073 list_add(&new_lb->l_entry, &lease_table_list);
1074 write_unlock(&lease_list_lock);
1075 }
1076
set_oplock_level(struct oplock_info * opinfo,int level,struct lease_ctx_info * lctx)1077 static void set_oplock_level(struct oplock_info *opinfo, int level,
1078 struct lease_ctx_info *lctx)
1079 {
1080 switch (level) {
1081 case SMB2_OPLOCK_LEVEL_BATCH:
1082 case SMB2_OPLOCK_LEVEL_EXCLUSIVE:
1083 grant_write_oplock(opinfo, level, lctx);
1084 break;
1085 case SMB2_OPLOCK_LEVEL_II:
1086 grant_read_oplock(opinfo, lctx);
1087 break;
1088 default:
1089 grant_none_oplock(opinfo, lctx);
1090 break;
1091 }
1092 }
1093
smb_send_parent_lease_break_noti(struct ksmbd_file * fp,struct lease_ctx_info * lctx)1094 void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
1095 struct lease_ctx_info *lctx)
1096 {
1097 struct oplock_info *opinfo;
1098 struct ksmbd_inode *p_ci = NULL;
1099
1100 if (lctx->version != 2)
1101 return;
1102
1103 p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
1104 if (!p_ci)
1105 return;
1106
1107 down_read(&p_ci->m_lock);
1108 list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) {
1109 if (opinfo->conn == NULL || !opinfo->is_lease)
1110 continue;
1111
1112 if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE &&
1113 (!(lctx->flags & SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE) ||
1114 !compare_guid_key(opinfo, fp->conn->ClientGUID,
1115 lctx->parent_lease_key))) {
1116 if (!atomic_inc_not_zero(&opinfo->refcount))
1117 continue;
1118
1119 if (ksmbd_conn_releasing(opinfo->conn)) {
1120 opinfo_put(opinfo);
1121 continue;
1122 }
1123
1124 oplock_break(opinfo, SMB2_OPLOCK_LEVEL_NONE, NULL);
1125 opinfo_put(opinfo);
1126 }
1127 }
1128 up_read(&p_ci->m_lock);
1129
1130 ksmbd_inode_put(p_ci);
1131 }
1132
smb_lazy_parent_lease_break_close(struct ksmbd_file * fp)1133 void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp)
1134 {
1135 struct oplock_info *opinfo;
1136 struct ksmbd_inode *p_ci = NULL;
1137
1138 rcu_read_lock();
1139 opinfo = rcu_dereference(fp->f_opinfo);
1140
1141 if (!opinfo || !opinfo->is_lease || opinfo->o_lease->version != 2) {
1142 rcu_read_unlock();
1143 return;
1144 }
1145 rcu_read_unlock();
1146
1147 p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
1148 if (!p_ci)
1149 return;
1150
1151 down_read(&p_ci->m_lock);
1152 list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) {
1153 if (opinfo->conn == NULL || !opinfo->is_lease)
1154 continue;
1155
1156 if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE) {
1157 if (!atomic_inc_not_zero(&opinfo->refcount))
1158 continue;
1159
1160 if (ksmbd_conn_releasing(opinfo->conn)) {
1161 opinfo_put(opinfo);
1162 continue;
1163 }
1164
1165 oplock_break(opinfo, SMB2_OPLOCK_LEVEL_NONE, NULL);
1166 opinfo_put(opinfo);
1167 }
1168 }
1169 up_read(&p_ci->m_lock);
1170
1171 ksmbd_inode_put(p_ci);
1172 }
1173
1174 /**
1175 * smb_grant_oplock() - handle oplock/lease request on file open
1176 * @work: smb work
1177 * @req_op_level: oplock level
1178 * @pid: id of open file
1179 * @fp: ksmbd file pointer
1180 * @tid: Tree id of connection
1181 * @lctx: lease context information on file open
1182 * @share_ret: share mode
1183 *
1184 * Return: 0 on success, otherwise error
1185 */
smb_grant_oplock(struct ksmbd_work * work,int req_op_level,u64 pid,struct ksmbd_file * fp,__u16 tid,struct lease_ctx_info * lctx,int share_ret)1186 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid,
1187 struct ksmbd_file *fp, __u16 tid,
1188 struct lease_ctx_info *lctx, int share_ret)
1189 {
1190 struct ksmbd_session *sess = work->sess;
1191 int err = 0;
1192 struct oplock_info *opinfo = NULL, *prev_opinfo = NULL;
1193 struct ksmbd_inode *ci = fp->f_ci;
1194 struct lease_table *new_lb = NULL;
1195 bool prev_op_has_lease;
1196 __le32 prev_op_state = 0;
1197
1198 /* Only v2 leases handle the directory */
1199 if (S_ISDIR(file_inode(fp->filp)->i_mode)) {
1200 if (!lctx || lctx->version != 2 ||
1201 (lctx->flags != SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE &&
1202 !lctx->epoch))
1203 return 0;
1204 }
1205
1206 opinfo = alloc_opinfo(work, pid, tid);
1207 if (!opinfo)
1208 return -ENOMEM;
1209
1210 if (lctx) {
1211 err = alloc_lease(opinfo, lctx);
1212 if (err)
1213 goto err_out;
1214 opinfo->is_lease = 1;
1215 }
1216
1217 /* ci does not have any oplock */
1218 if (!opinfo_count(fp))
1219 goto set_lev;
1220
1221 /* grant none-oplock if second open is trunc */
1222 if (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE &&
1223 fp->cdoption != FILE_OVERWRITE_LE &&
1224 fp->cdoption != FILE_SUPERSEDE_LE) {
1225 req_op_level = SMB2_OPLOCK_LEVEL_NONE;
1226 goto set_lev;
1227 }
1228
1229 if (lctx) {
1230 struct oplock_info *m_opinfo;
1231
1232 /* is lease already granted ? */
1233 m_opinfo = same_client_has_lease(ci, sess->ClientGUID,
1234 lctx);
1235 if (m_opinfo) {
1236 copy_lease(m_opinfo, opinfo);
1237 if (atomic_read(&m_opinfo->breaking_cnt))
1238 opinfo->o_lease->flags =
1239 SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE;
1240 goto out;
1241 }
1242 }
1243 prev_opinfo = opinfo_get_list(ci);
1244 if (!prev_opinfo ||
1245 (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) {
1246 opinfo_put(prev_opinfo);
1247 goto set_lev;
1248 }
1249 prev_op_has_lease = prev_opinfo->is_lease;
1250 if (prev_op_has_lease)
1251 prev_op_state = prev_opinfo->o_lease->state;
1252
1253 if (share_ret < 0 &&
1254 prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1255 err = share_ret;
1256 opinfo_put(prev_opinfo);
1257 goto err_out;
1258 }
1259
1260 if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
1261 prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1262 opinfo_put(prev_opinfo);
1263 goto op_break_not_needed;
1264 }
1265
1266 err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II, work);
1267 opinfo_put(prev_opinfo);
1268 if (err == -ENOENT)
1269 goto set_lev;
1270 /* Check all oplock was freed by close */
1271 else if (err < 0)
1272 goto err_out;
1273
1274 op_break_not_needed:
1275 if (share_ret < 0) {
1276 err = share_ret;
1277 goto err_out;
1278 }
1279
1280 if (req_op_level != SMB2_OPLOCK_LEVEL_NONE)
1281 req_op_level = SMB2_OPLOCK_LEVEL_II;
1282
1283 /* grant fixed oplock on stacked locking between lease and oplock */
1284 if (prev_op_has_lease && !lctx)
1285 if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE)
1286 req_op_level = SMB2_OPLOCK_LEVEL_NONE;
1287
1288 if (!prev_op_has_lease && lctx) {
1289 req_op_level = SMB2_OPLOCK_LEVEL_II;
1290 lctx->req_state = SMB2_LEASE_READ_CACHING_LE;
1291 }
1292
1293 set_lev:
1294 set_oplock_level(opinfo, req_op_level, lctx);
1295
1296 out:
1297 /*
1298 * Set o_fp before any publication so that concurrent readers
1299 * (e.g. find_same_lease_key() on the lease list) that
1300 * dereference opinfo->o_fp don't hit a NULL pointer.
1301 *
1302 * Keep the original publication order so concurrent opens can
1303 * still observe the in-flight grant via ci->m_op_list, but make
1304 * everything after opinfo_add() no-fail by preallocating any new
1305 * lease_table first.
1306 */
1307 opinfo->o_fp = fp;
1308 if (opinfo->is_lease) {
1309 new_lb = alloc_lease_table(opinfo);
1310 if (!new_lb) {
1311 err = -ENOMEM;
1312 goto err_out;
1313 }
1314 }
1315
1316 opinfo_count_inc(fp);
1317 opinfo_add(opinfo, fp);
1318
1319 if (opinfo->is_lease)
1320 add_lease_global_list(opinfo, new_lb);
1321
1322 rcu_assign_pointer(fp->f_opinfo, opinfo);
1323
1324 return 0;
1325 err_out:
1326 kfree(new_lb);
1327 opinfo_put(opinfo);
1328 return err;
1329 }
1330
1331 /**
1332 * smb_break_all_write_oplock() - break batch/exclusive oplock to level2
1333 * @work: smb work
1334 * @fp: ksmbd file pointer
1335 * @is_trunc: truncate on open
1336 */
smb_break_all_write_oplock(struct ksmbd_work * work,struct ksmbd_file * fp,int is_trunc)1337 static void smb_break_all_write_oplock(struct ksmbd_work *work,
1338 struct ksmbd_file *fp, int is_trunc)
1339 {
1340 struct oplock_info *brk_opinfo;
1341
1342 brk_opinfo = opinfo_get_list(fp->f_ci);
1343 if (!brk_opinfo)
1344 return;
1345 if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
1346 brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1347 opinfo_put(brk_opinfo);
1348 return;
1349 }
1350
1351 brk_opinfo->open_trunc = is_trunc;
1352 oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II, work);
1353 opinfo_put(brk_opinfo);
1354 }
1355
1356 /**
1357 * smb_break_all_levII_oplock() - send level2 oplock or read lease break command
1358 * from server to client
1359 * @work: smb work
1360 * @fp: ksmbd file pointer
1361 * @is_trunc: truncate on open
1362 */
smb_break_all_levII_oplock(struct ksmbd_work * work,struct ksmbd_file * fp,int is_trunc)1363 void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp,
1364 int is_trunc)
1365 {
1366 struct oplock_info *op, *brk_op;
1367 struct ksmbd_inode *ci;
1368 struct ksmbd_conn *conn = work->conn;
1369
1370 if (!test_share_config_flag(work->tcon->share_conf,
1371 KSMBD_SHARE_FLAG_OPLOCKS))
1372 return;
1373
1374 ci = fp->f_ci;
1375 op = opinfo_get(fp);
1376
1377 down_read(&ci->m_lock);
1378 list_for_each_entry(brk_op, &ci->m_op_list, op_entry) {
1379 if (brk_op->conn == NULL)
1380 continue;
1381
1382 if (!atomic_inc_not_zero(&brk_op->refcount))
1383 continue;
1384
1385 if (ksmbd_conn_releasing(brk_op->conn)) {
1386 opinfo_put(brk_op);
1387 continue;
1388 }
1389
1390 if (brk_op->is_lease && (brk_op->o_lease->state &
1391 (~(SMB2_LEASE_READ_CACHING_LE |
1392 SMB2_LEASE_HANDLE_CACHING_LE)))) {
1393 ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n",
1394 brk_op->o_lease->state);
1395 goto next;
1396 } else if (brk_op->level !=
1397 SMB2_OPLOCK_LEVEL_II) {
1398 ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n",
1399 brk_op->level);
1400 goto next;
1401 }
1402
1403 /* Skip oplock being break to none */
1404 if (brk_op->is_lease &&
1405 brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE &&
1406 atomic_read(&brk_op->breaking_cnt))
1407 goto next;
1408
1409 if (op && op->is_lease && brk_op->is_lease &&
1410 !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID,
1411 SMB2_CLIENT_GUID_SIZE) &&
1412 !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key,
1413 SMB2_LEASE_KEY_SIZE))
1414 goto next;
1415 brk_op->open_trunc = is_trunc;
1416 oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE, NULL);
1417 next:
1418 opinfo_put(brk_op);
1419 }
1420 up_read(&ci->m_lock);
1421
1422 if (op)
1423 opinfo_put(op);
1424 }
1425
1426 /**
1427 * smb_break_all_oplock() - break both batch/exclusive and level2 oplock
1428 * @work: smb work
1429 * @fp: ksmbd file pointer
1430 */
smb_break_all_oplock(struct ksmbd_work * work,struct ksmbd_file * fp)1431 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp)
1432 {
1433 if (!test_share_config_flag(work->tcon->share_conf,
1434 KSMBD_SHARE_FLAG_OPLOCKS))
1435 return;
1436
1437 smb_break_all_write_oplock(work, fp, 1);
1438 smb_break_all_levII_oplock(work, fp, 1);
1439 }
1440
1441 /**
1442 * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type
1443 * @lease_state: lease type
1444 *
1445 * Return: 0 if no mapping, otherwise corresponding oplock type
1446 */
smb2_map_lease_to_oplock(__le32 lease_state)1447 __u8 smb2_map_lease_to_oplock(__le32 lease_state)
1448 {
1449 if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE |
1450 SMB2_LEASE_READ_CACHING_LE |
1451 SMB2_LEASE_WRITE_CACHING_LE)) {
1452 return SMB2_OPLOCK_LEVEL_BATCH;
1453 } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE &&
1454 lease_state & SMB2_LEASE_WRITE_CACHING_LE) {
1455 if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE))
1456 return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
1457 } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) {
1458 return SMB2_OPLOCK_LEVEL_II;
1459 }
1460 return 0;
1461 }
1462
1463 /**
1464 * create_lease_buf() - create lease context for open cmd response
1465 * @rbuf: buffer to create lease context response
1466 * @lease: buffer to stored parsed lease state information
1467 */
create_lease_buf(u8 * rbuf,struct lease * lease)1468 void create_lease_buf(u8 *rbuf, struct lease *lease)
1469 {
1470 if (lease->version == 2) {
1471 struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf;
1472
1473 memset(buf, 0, sizeof(struct create_lease_v2));
1474 memcpy(buf->lcontext.LeaseKey, lease->lease_key,
1475 SMB2_LEASE_KEY_SIZE);
1476 buf->lcontext.LeaseFlags = lease->flags;
1477 buf->lcontext.Epoch = cpu_to_le16(lease->epoch);
1478 buf->lcontext.LeaseState = lease->state;
1479 if (lease->flags == SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE)
1480 memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key,
1481 SMB2_LEASE_KEY_SIZE);
1482 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1483 (struct create_lease_v2, lcontext));
1484 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
1485 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1486 (struct create_lease_v2, Name));
1487 buf->ccontext.NameLength = cpu_to_le16(4);
1488 buf->Name[0] = 'R';
1489 buf->Name[1] = 'q';
1490 buf->Name[2] = 'L';
1491 buf->Name[3] = 's';
1492 } else {
1493 struct create_lease *buf = (struct create_lease *)rbuf;
1494
1495 memset(buf, 0, sizeof(struct create_lease));
1496 memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE);
1497 buf->lcontext.LeaseFlags = lease->flags;
1498 buf->lcontext.LeaseState = lease->state;
1499 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1500 (struct create_lease, lcontext));
1501 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1502 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1503 (struct create_lease, Name));
1504 buf->ccontext.NameLength = cpu_to_le16(4);
1505 buf->Name[0] = 'R';
1506 buf->Name[1] = 'q';
1507 buf->Name[2] = 'L';
1508 buf->Name[3] = 's';
1509 }
1510 }
1511
1512 /**
1513 * parse_lease_state() - parse lease context contained in file open request
1514 * @open_req: buffer containing smb2 file open(create) request
1515 *
1516 * Return: allocated lease context object on success, otherwise NULL
1517 */
parse_lease_state(void * open_req)1518 struct lease_ctx_info *parse_lease_state(void *open_req)
1519 {
1520 struct create_context *cc;
1521 struct smb2_create_req *req = (struct smb2_create_req *)open_req;
1522 struct lease_ctx_info *lreq;
1523
1524 cc = smb2_find_context_vals(req, SMB2_CREATE_REQUEST_LEASE, 4);
1525 if (IS_ERR_OR_NULL(cc))
1526 return NULL;
1527
1528 lreq = kzalloc_obj(struct lease_ctx_info, KSMBD_DEFAULT_GFP);
1529 if (!lreq)
1530 return NULL;
1531
1532 if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) {
1533 struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
1534
1535 if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) <
1536 sizeof(struct create_lease_v2) - 4)
1537 goto err_out;
1538
1539 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
1540 lreq->req_state = lc->lcontext.LeaseState;
1541 lreq->flags = lc->lcontext.LeaseFlags;
1542 lreq->epoch = lc->lcontext.Epoch;
1543 lreq->duration = lc->lcontext.LeaseDuration;
1544 if (lreq->flags == SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE)
1545 memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey,
1546 SMB2_LEASE_KEY_SIZE);
1547 lreq->version = 2;
1548 } else {
1549 struct create_lease *lc = (struct create_lease *)cc;
1550
1551 if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) <
1552 sizeof(struct create_lease))
1553 goto err_out;
1554
1555 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
1556 lreq->req_state = lc->lcontext.LeaseState;
1557 lreq->flags = lc->lcontext.LeaseFlags;
1558 lreq->duration = lc->lcontext.LeaseDuration;
1559 lreq->version = 1;
1560 }
1561 return lreq;
1562 err_out:
1563 kfree(lreq);
1564 return NULL;
1565 }
1566
1567 /**
1568 * smb2_find_context_vals() - find a particular context info in open request
1569 * @open_req: buffer containing smb2 file open(create) request
1570 * @tag: context name to search for
1571 * @tag_len: the length of tag
1572 *
1573 * Return: pointer to requested context, NULL if @str context not found
1574 * or error pointer if name length is invalid.
1575 */
smb2_find_context_vals(void * open_req,const char * tag,int tag_len)1576 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len)
1577 {
1578 struct create_context *cc;
1579 unsigned int next = 0;
1580 char *name;
1581 struct smb2_create_req *req = (struct smb2_create_req *)open_req;
1582 unsigned int remain_len, name_off, name_len, value_off, value_len,
1583 cc_len;
1584
1585 /*
1586 * CreateContextsOffset and CreateContextsLength are guaranteed to
1587 * be valid because of ksmbd_smb2_check_message().
1588 */
1589 cc = (struct create_context *)((char *)req +
1590 le32_to_cpu(req->CreateContextsOffset));
1591 remain_len = le32_to_cpu(req->CreateContextsLength);
1592 do {
1593 cc = (struct create_context *)((char *)cc + next);
1594 if (remain_len < offsetof(struct create_context, Buffer))
1595 return ERR_PTR(-EINVAL);
1596
1597 next = le32_to_cpu(cc->Next);
1598 name_off = le16_to_cpu(cc->NameOffset);
1599 name_len = le16_to_cpu(cc->NameLength);
1600 value_off = le16_to_cpu(cc->DataOffset);
1601 value_len = le32_to_cpu(cc->DataLength);
1602 cc_len = next ? next : remain_len;
1603
1604 if ((next & 0x7) != 0 ||
1605 next > remain_len ||
1606 name_off != offsetof(struct create_context, Buffer) ||
1607 name_len < 4 ||
1608 name_off + name_len > cc_len ||
1609 (value_off & 0x7) != 0 ||
1610 (value_len && value_off < name_off + (name_len < 8 ? 8 : name_len)) ||
1611 ((u64)value_off + value_len > cc_len))
1612 return ERR_PTR(-EINVAL);
1613
1614 name = (char *)cc + name_off;
1615 if (name_len == tag_len && !memcmp(name, tag, name_len))
1616 return cc;
1617
1618 remain_len -= next;
1619 } while (next != 0);
1620
1621 return NULL;
1622 }
1623
1624 /**
1625 * create_durable_rsp_buf() - create durable handle context
1626 * @cc: buffer to create durable context response
1627 */
create_durable_rsp_buf(char * cc)1628 void create_durable_rsp_buf(char *cc)
1629 {
1630 struct create_durable_rsp *buf;
1631
1632 buf = (struct create_durable_rsp *)cc;
1633 memset(buf, 0, sizeof(struct create_durable_rsp));
1634 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1635 (struct create_durable_rsp, Data));
1636 buf->ccontext.DataLength = cpu_to_le32(8);
1637 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1638 (struct create_durable_rsp, Name));
1639 buf->ccontext.NameLength = cpu_to_le16(4);
1640 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */
1641 buf->Name[0] = 'D';
1642 buf->Name[1] = 'H';
1643 buf->Name[2] = 'n';
1644 buf->Name[3] = 'Q';
1645 }
1646
1647 /**
1648 * create_durable_v2_rsp_buf() - create durable handle v2 context
1649 * @cc: buffer to create durable context response
1650 * @fp: ksmbd file pointer
1651 */
create_durable_v2_rsp_buf(char * cc,struct ksmbd_file * fp)1652 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp)
1653 {
1654 struct create_durable_rsp_v2 *buf;
1655
1656 buf = (struct create_durable_rsp_v2 *)cc;
1657 memset(buf, 0, sizeof(struct create_durable_rsp));
1658 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1659 (struct create_durable_rsp, Data));
1660 buf->ccontext.DataLength = cpu_to_le32(8);
1661 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1662 (struct create_durable_rsp, Name));
1663 buf->ccontext.NameLength = cpu_to_le16(4);
1664 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */
1665 buf->Name[0] = 'D';
1666 buf->Name[1] = 'H';
1667 buf->Name[2] = '2';
1668 buf->Name[3] = 'Q';
1669
1670 buf->dcontext.Timeout = cpu_to_le32(fp->durable_timeout);
1671 if (fp->is_persistent)
1672 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1673 }
1674
1675 /**
1676 * create_mxac_rsp_buf() - create query maximal access context
1677 * @cc: buffer to create maximal access context response
1678 * @maximal_access: maximal access
1679 */
create_mxac_rsp_buf(char * cc,int maximal_access)1680 void create_mxac_rsp_buf(char *cc, int maximal_access)
1681 {
1682 struct create_mxac_rsp *buf;
1683
1684 buf = (struct create_mxac_rsp *)cc;
1685 memset(buf, 0, sizeof(struct create_mxac_rsp));
1686 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1687 (struct create_mxac_rsp, QueryStatus));
1688 buf->ccontext.DataLength = cpu_to_le32(8);
1689 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1690 (struct create_mxac_rsp, Name));
1691 buf->ccontext.NameLength = cpu_to_le16(4);
1692 /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */
1693 buf->Name[0] = 'M';
1694 buf->Name[1] = 'x';
1695 buf->Name[2] = 'A';
1696 buf->Name[3] = 'c';
1697
1698 buf->QueryStatus = STATUS_SUCCESS;
1699 buf->MaximalAccess = cpu_to_le32(maximal_access);
1700 }
1701
create_disk_id_rsp_buf(char * cc,__u64 file_id,__u64 vol_id)1702 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id)
1703 {
1704 struct create_disk_id_rsp *buf;
1705
1706 buf = (struct create_disk_id_rsp *)cc;
1707 memset(buf, 0, sizeof(struct create_disk_id_rsp));
1708 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1709 (struct create_disk_id_rsp, DiskFileId));
1710 buf->ccontext.DataLength = cpu_to_le32(32);
1711 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1712 (struct create_mxac_rsp, Name));
1713 buf->ccontext.NameLength = cpu_to_le16(4);
1714 /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */
1715 buf->Name[0] = 'Q';
1716 buf->Name[1] = 'F';
1717 buf->Name[2] = 'i';
1718 buf->Name[3] = 'd';
1719
1720 buf->DiskFileId = cpu_to_le64(file_id);
1721 buf->VolumeId = cpu_to_le64(vol_id);
1722 }
1723
1724 /**
1725 * create_posix_rsp_buf() - create posix extension context
1726 * @cc: buffer to create posix on posix response
1727 * @fp: ksmbd file pointer
1728 */
create_posix_rsp_buf(char * cc,struct ksmbd_file * fp)1729 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
1730 {
1731 struct create_posix_rsp *buf;
1732 struct inode *inode = file_inode(fp->filp);
1733 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
1734 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
1735 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
1736
1737 buf = (struct create_posix_rsp *)cc;
1738 memset(buf, 0, sizeof(struct create_posix_rsp));
1739 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1740 (struct create_posix_rsp, nlink));
1741 /*
1742 * DataLength = nlink(4) + reparse_tag(4) + mode(4) +
1743 * domain sid(28) + unix group sid(16).
1744 */
1745 buf->ccontext.DataLength = cpu_to_le32(56);
1746 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1747 (struct create_posix_rsp, Name));
1748 buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
1749 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
1750 buf->Name[0] = 0x93;
1751 buf->Name[1] = 0xAD;
1752 buf->Name[2] = 0x25;
1753 buf->Name[3] = 0x50;
1754 buf->Name[4] = 0x9C;
1755 buf->Name[5] = 0xB4;
1756 buf->Name[6] = 0x11;
1757 buf->Name[7] = 0xE7;
1758 buf->Name[8] = 0xB4;
1759 buf->Name[9] = 0x23;
1760 buf->Name[10] = 0x83;
1761 buf->Name[11] = 0xDE;
1762 buf->Name[12] = 0x96;
1763 buf->Name[13] = 0x8B;
1764 buf->Name[14] = 0xCD;
1765 buf->Name[15] = 0x7C;
1766
1767 buf->nlink = cpu_to_le32(inode->i_nlink);
1768 buf->reparse_tag = cpu_to_le32(fp->volatile_id);
1769 buf->mode = cpu_to_le32(inode->i_mode & 0777);
1770 /*
1771 * SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)).
1772 * Domain sid(28) = revision(1) + num_subauth(1) + authority(6) +
1773 * sub_auth(4 * 4(num_subauth)) + RID(4).
1774 * UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) +
1775 * sub_auth(4 * 1(num_subauth)) + RID(4).
1776 */
1777 id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)),
1778 SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]);
1779 id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)),
1780 SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]);
1781 }
1782
1783 /*
1784 * Find lease object(opinfo) for given lease key/fid from lease
1785 * break/file close path.
1786 */
1787 /**
1788 * lookup_lease_in_table() - find a matching lease info object
1789 * @conn: connection instance
1790 * @lease_key: lease key to be searched for
1791 *
1792 * Return: opinfo if found matching opinfo, otherwise NULL
1793 */
lookup_lease_in_table(struct ksmbd_conn * conn,char * lease_key)1794 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
1795 char *lease_key)
1796 {
1797 struct oplock_info *opinfo = NULL, *ret_op = NULL;
1798 struct lease_table *lt;
1799 int ret;
1800
1801 read_lock(&lease_list_lock);
1802 list_for_each_entry(lt, &lease_table_list, l_entry) {
1803 if (!memcmp(lt->client_guid, conn->ClientGUID,
1804 SMB2_CLIENT_GUID_SIZE))
1805 goto found;
1806 }
1807
1808 read_unlock(&lease_list_lock);
1809 return NULL;
1810
1811 found:
1812 rcu_read_lock();
1813 list_for_each_entry_rcu(opinfo, <->lease_list, lease_entry) {
1814 if (!atomic_inc_not_zero(&opinfo->refcount))
1815 continue;
1816 rcu_read_unlock();
1817 if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING)
1818 goto op_next;
1819 if (!(opinfo->o_lease->state &
1820 (SMB2_LEASE_HANDLE_CACHING_LE |
1821 SMB2_LEASE_WRITE_CACHING_LE)))
1822 goto op_next;
1823 ret = compare_guid_key(opinfo, conn->ClientGUID,
1824 lease_key);
1825 if (ret) {
1826 ksmbd_debug(OPLOCK, "found opinfo\n");
1827 ret_op = opinfo;
1828 goto out;
1829 }
1830 op_next:
1831 opinfo_put(opinfo);
1832 rcu_read_lock();
1833 }
1834 rcu_read_unlock();
1835
1836 out:
1837 read_unlock(&lease_list_lock);
1838 return ret_op;
1839 }
1840
smb2_check_durable_oplock(struct ksmbd_conn * conn,struct ksmbd_share_config * share,struct ksmbd_file * fp,struct lease_ctx_info * lctx,struct ksmbd_user * user,char * name)1841 int smb2_check_durable_oplock(struct ksmbd_conn *conn,
1842 struct ksmbd_share_config *share,
1843 struct ksmbd_file *fp,
1844 struct lease_ctx_info *lctx,
1845 struct ksmbd_user *user,
1846 char *name)
1847 {
1848 struct oplock_info *opinfo = opinfo_get(fp);
1849 int ret = 0;
1850
1851 if (!opinfo)
1852 return 0;
1853
1854 if (ksmbd_vfs_compare_durable_owner(fp, user) == false) {
1855 ksmbd_debug(SMB, "Durable handle reconnect failed: owner mismatch\n");
1856 ret = -EBADF;
1857 goto out;
1858 }
1859
1860 if (opinfo->is_lease == false) {
1861 if (lctx) {
1862 pr_err("create context include lease\n");
1863 ret = -EBADF;
1864 goto out;
1865 }
1866
1867 if (opinfo->level != SMB2_OPLOCK_LEVEL_BATCH) {
1868 pr_err("oplock level is not equal to SMB2_OPLOCK_LEVEL_BATCH\n");
1869 ret = -EBADF;
1870 }
1871
1872 goto out;
1873 }
1874
1875 if (memcmp(conn->ClientGUID, fp->client_guid,
1876 SMB2_CLIENT_GUID_SIZE)) {
1877 ksmbd_debug(SMB, "Client guid of fp is not equal to the one of connection\n");
1878 ret = -EBADF;
1879 goto out;
1880 }
1881
1882 if (!lctx) {
1883 ksmbd_debug(SMB, "create context does not include lease\n");
1884 ret = -EBADF;
1885 goto out;
1886 }
1887
1888 if (memcmp(opinfo->o_lease->lease_key, lctx->lease_key,
1889 SMB2_LEASE_KEY_SIZE)) {
1890 ksmbd_debug(SMB,
1891 "lease key of fp does not match lease key in create context\n");
1892 ret = -EBADF;
1893 goto out;
1894 }
1895
1896 if (!(opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE)) {
1897 ksmbd_debug(SMB, "lease state does not contain SMB2_LEASE_HANDLE_CACHING\n");
1898 ret = -EBADF;
1899 goto out;
1900 }
1901
1902 if (opinfo->o_lease->version != lctx->version) {
1903 ksmbd_debug(SMB,
1904 "lease version of fp does not match the one in create context\n");
1905 ret = -EBADF;
1906 goto out;
1907 }
1908
1909 if (!ksmbd_inode_pending_delete(fp))
1910 ret = ksmbd_validate_name_reconnect(share, fp, name);
1911 out:
1912 opinfo_put(opinfo);
1913 return ret;
1914 }
1915