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
485 guid2 = opinfo->conn->ClientGUID;
486 key2 = opinfo->o_lease->lease_key;
487 if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) &&
488 !memcmp(key1, key2, SMB2_LEASE_KEY_SIZE))
489 return 1;
490
491 return 0;
492 }
493
494 /**
495 * same_client_has_lease() - check whether current lease request is
496 * from lease owner of file
497 * @ci: master file pointer
498 * @client_guid: Client GUID
499 * @lctx: lease context information
500 *
501 * Return: oplock(lease) object on success, otherwise NULL
502 */
same_client_has_lease(struct ksmbd_inode * ci,char * client_guid,struct lease_ctx_info * lctx)503 static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci,
504 char *client_guid,
505 struct lease_ctx_info *lctx)
506 {
507 int ret;
508 struct lease *lease;
509 struct oplock_info *opinfo;
510 struct oplock_info *m_opinfo = NULL;
511
512 if (!lctx)
513 return NULL;
514
515 /*
516 * Compare lease key and client_guid to know request from same owner
517 * of same client
518 */
519 down_read(&ci->m_lock);
520 list_for_each_entry(opinfo, &ci->m_op_list, op_entry) {
521 if (!opinfo->is_lease || !opinfo->conn)
522 continue;
523 lease = opinfo->o_lease;
524
525 ret = compare_guid_key(opinfo, client_guid, lctx->lease_key);
526 if (ret) {
527 m_opinfo = opinfo;
528 /* skip upgrading lease about breaking lease */
529 if (atomic_read(&opinfo->breaking_cnt))
530 continue;
531
532 /* upgrading lease */
533 if ((atomic_read(&ci->op_count) +
534 atomic_read(&ci->sop_count)) == 1) {
535 if (lease->state != SMB2_LEASE_NONE_LE &&
536 lease->state == (lctx->req_state & lease->state)) {
537 lease->epoch++;
538 lease->state |= lctx->req_state;
539 if (lctx->req_state &
540 SMB2_LEASE_WRITE_CACHING_LE)
541 lease_read_to_write(opinfo);
542
543 }
544 } else if ((atomic_read(&ci->op_count) +
545 atomic_read(&ci->sop_count)) > 1) {
546 if (lctx->req_state ==
547 (SMB2_LEASE_READ_CACHING_LE |
548 SMB2_LEASE_HANDLE_CACHING_LE)) {
549 lease->epoch++;
550 lease->state = lctx->req_state;
551 }
552 }
553
554 if (lctx->req_state && lease->state ==
555 SMB2_LEASE_NONE_LE) {
556 lease->epoch++;
557 lease_none_upgrade(opinfo, lctx->req_state);
558 }
559 }
560 }
561 up_read(&ci->m_lock);
562
563 return m_opinfo;
564 }
565
wait_for_break_ack(struct oplock_info * opinfo)566 static void wait_for_break_ack(struct oplock_info *opinfo)
567 {
568 int rc = 0;
569
570 rc = wait_event_interruptible_timeout(opinfo->oplock_q,
571 opinfo->op_state == OPLOCK_STATE_NONE ||
572 opinfo->op_state == OPLOCK_CLOSING,
573 OPLOCK_WAIT_TIME);
574
575 /* is this a timeout ? */
576 if (!rc) {
577 if (opinfo->is_lease)
578 opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
579 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
580 opinfo->op_state = OPLOCK_STATE_NONE;
581 }
582 }
583
wake_up_oplock_break(struct oplock_info * opinfo)584 static void wake_up_oplock_break(struct oplock_info *opinfo)
585 {
586 clear_bit_unlock(0, &opinfo->pending_break);
587 /* memory barrier is needed for wake_up_bit() */
588 smp_mb__after_atomic();
589 wake_up_bit(&opinfo->pending_break, 0);
590 }
591
oplock_break_pending(struct oplock_info * opinfo,int req_op_level)592 static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level)
593 {
594 while (test_and_set_bit(0, &opinfo->pending_break)) {
595 wait_on_bit(&opinfo->pending_break, 0, TASK_UNINTERRUPTIBLE);
596
597 /* Not immediately break to none. */
598 opinfo->open_trunc = 0;
599
600 if (opinfo->op_state == OPLOCK_CLOSING)
601 return -ENOENT;
602 else if (opinfo->level <= req_op_level) {
603 if (opinfo->is_lease == false)
604 return 1;
605
606 if (opinfo->o_lease->state !=
607 (SMB2_LEASE_HANDLE_CACHING_LE |
608 SMB2_LEASE_READ_CACHING_LE))
609 return 1;
610 }
611 }
612
613 if (opinfo->level <= req_op_level) {
614 if (opinfo->is_lease == false) {
615 wake_up_oplock_break(opinfo);
616 return 1;
617 }
618 if (opinfo->o_lease->state !=
619 (SMB2_LEASE_HANDLE_CACHING_LE |
620 SMB2_LEASE_READ_CACHING_LE)) {
621 wake_up_oplock_break(opinfo);
622 return 1;
623 }
624 }
625 return 0;
626 }
627
628 /**
629 * __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn
630 * to client
631 * @wk: smb work object
632 *
633 * There are two ways this function can be called. 1- while file open we break
634 * from exclusive/batch lock to levelII oplock and 2- while file write/truncate
635 * we break from levelII oplock no oplock.
636 * work->request_buf contains oplock_info.
637 */
__smb2_oplock_break_noti(struct work_struct * wk)638 static void __smb2_oplock_break_noti(struct work_struct *wk)
639 {
640 struct smb2_oplock_break *rsp = NULL;
641 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
642 struct ksmbd_conn *conn = work->conn;
643 struct oplock_break_info *br_info = work->request_buf;
644 struct smb2_hdr *rsp_hdr;
645 struct ksmbd_file *fp;
646
647 fp = ksmbd_lookup_global_fd(br_info->fid);
648 if (!fp)
649 goto out;
650
651 if (allocate_interim_rsp_buf(work)) {
652 pr_err("smb2_allocate_rsp_buf failed! ");
653 ksmbd_fd_put(work, fp);
654 goto out;
655 }
656
657 rsp_hdr = smb_get_msg(work->response_buf);
658 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
659 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
660 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
661 rsp_hdr->CreditRequest = cpu_to_le16(0);
662 rsp_hdr->Command = SMB2_OPLOCK_BREAK;
663 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
664 rsp_hdr->NextCommand = 0;
665 rsp_hdr->MessageId = cpu_to_le64(-1);
666 rsp_hdr->Id.SyncId.ProcessId = 0;
667 rsp_hdr->Id.SyncId.TreeId = 0;
668 rsp_hdr->SessionId = 0;
669 memset(rsp_hdr->Signature, 0, 16);
670
671 rsp = smb_get_msg(work->response_buf);
672
673 rsp->StructureSize = cpu_to_le16(24);
674 if (!br_info->open_trunc &&
675 (br_info->level == SMB2_OPLOCK_LEVEL_BATCH ||
676 br_info->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
677 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_II;
678 else
679 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE;
680 rsp->Reserved = 0;
681 rsp->Reserved2 = 0;
682 rsp->PersistentFid = fp->persistent_id;
683 rsp->VolatileFid = fp->volatile_id;
684
685 ksmbd_fd_put(work, fp);
686 if (ksmbd_iov_pin_rsp(work, (void *)rsp,
687 sizeof(struct smb2_oplock_break)))
688 goto out;
689
690 ksmbd_debug(OPLOCK,
691 "sending oplock break v_id %llu p_id = %llu lock level = %d\n",
692 rsp->VolatileFid, rsp->PersistentFid, rsp->OplockLevel);
693
694 ksmbd_conn_write(work);
695
696 out:
697 ksmbd_free_work_struct(work);
698 ksmbd_conn_r_count_dec(conn);
699 }
700
701 /**
702 * smb2_oplock_break_noti() - send smb2 exclusive/batch to level2 oplock
703 * break command from server to client
704 * @opinfo: oplock info object
705 *
706 * Return: 0 on success, otherwise error
707 */
smb2_oplock_break_noti(struct oplock_info * opinfo)708 static int smb2_oplock_break_noti(struct oplock_info *opinfo)
709 {
710 struct ksmbd_conn *conn = opinfo->conn;
711 struct oplock_break_info *br_info;
712 int ret = 0;
713 struct ksmbd_work *work = ksmbd_alloc_work_struct();
714
715 if (!work)
716 return -ENOMEM;
717
718 br_info = kmalloc_obj(struct oplock_break_info, KSMBD_DEFAULT_GFP);
719 if (!br_info) {
720 ksmbd_free_work_struct(work);
721 return -ENOMEM;
722 }
723
724 br_info->level = opinfo->level;
725 br_info->fid = opinfo->fid;
726 br_info->open_trunc = opinfo->open_trunc;
727
728 work->request_buf = (char *)br_info;
729 work->conn = conn;
730 work->sess = opinfo->sess;
731
732 ksmbd_conn_r_count_inc(conn);
733 if (opinfo->op_state == OPLOCK_ACK_WAIT) {
734 INIT_WORK(&work->work, __smb2_oplock_break_noti);
735 ksmbd_queue_work(work);
736
737 wait_for_break_ack(opinfo);
738 } else {
739 __smb2_oplock_break_noti(&work->work);
740 if (opinfo->level == SMB2_OPLOCK_LEVEL_II)
741 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
742 }
743 return ret;
744 }
745
746 /**
747 * __smb2_lease_break_noti() - send lease break command from server
748 * to client
749 * @wk: smb work object
750 */
__smb2_lease_break_noti(struct work_struct * wk)751 static void __smb2_lease_break_noti(struct work_struct *wk)
752 {
753 struct smb2_lease_break *rsp = NULL;
754 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
755 struct ksmbd_conn *conn = work->conn;
756 struct lease_break_info *br_info = work->request_buf;
757 struct smb2_hdr *rsp_hdr;
758
759 if (allocate_interim_rsp_buf(work)) {
760 ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! ");
761 goto out;
762 }
763
764 rsp_hdr = smb_get_msg(work->response_buf);
765 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
766 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
767 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
768 rsp_hdr->CreditRequest = cpu_to_le16(0);
769 rsp_hdr->Command = SMB2_OPLOCK_BREAK;
770 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
771 rsp_hdr->NextCommand = 0;
772 rsp_hdr->MessageId = cpu_to_le64(-1);
773 rsp_hdr->Id.SyncId.ProcessId = 0;
774 rsp_hdr->Id.SyncId.TreeId = 0;
775 rsp_hdr->SessionId = 0;
776 memset(rsp_hdr->Signature, 0, 16);
777
778 rsp = smb_get_msg(work->response_buf);
779 rsp->StructureSize = cpu_to_le16(44);
780 rsp->Epoch = br_info->epoch;
781 rsp->Flags = 0;
782
783 if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING_LE |
784 SMB2_LEASE_HANDLE_CACHING_LE))
785 rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
786
787 memcpy(rsp->LeaseKey, br_info->lease_key, SMB2_LEASE_KEY_SIZE);
788 rsp->CurrentLeaseState = br_info->curr_state;
789 rsp->NewLeaseState = br_info->new_state;
790 rsp->BreakReason = 0;
791 rsp->AccessMaskHint = 0;
792 rsp->ShareMaskHint = 0;
793
794 if (ksmbd_iov_pin_rsp(work, (void *)rsp,
795 sizeof(struct smb2_lease_break)))
796 goto out;
797
798 ksmbd_conn_write(work);
799
800 out:
801 ksmbd_free_work_struct(work);
802 ksmbd_conn_r_count_dec(conn);
803 }
804
805 /**
806 * smb2_lease_break_noti() - break lease when a new client request
807 * write lease
808 * @opinfo: contains lease state information
809 *
810 * Return: 0 on success, otherwise error
811 */
smb2_lease_break_noti(struct oplock_info * opinfo)812 static int smb2_lease_break_noti(struct oplock_info *opinfo)
813 {
814 struct ksmbd_conn *conn = opinfo->conn;
815 struct ksmbd_work *work;
816 struct lease_break_info *br_info;
817 struct lease *lease = opinfo->o_lease;
818
819 work = ksmbd_alloc_work_struct();
820 if (!work)
821 return -ENOMEM;
822
823 br_info = kmalloc_obj(struct lease_break_info, KSMBD_DEFAULT_GFP);
824 if (!br_info) {
825 ksmbd_free_work_struct(work);
826 return -ENOMEM;
827 }
828
829 br_info->curr_state = lease->state;
830 br_info->new_state = lease->new_state;
831 if (lease->version == 2)
832 br_info->epoch = cpu_to_le16(++lease->epoch);
833 else
834 br_info->epoch = 0;
835 memcpy(br_info->lease_key, lease->lease_key, SMB2_LEASE_KEY_SIZE);
836
837 work->request_buf = (char *)br_info;
838 work->conn = conn;
839 work->sess = opinfo->sess;
840
841 ksmbd_conn_r_count_inc(conn);
842 if (opinfo->op_state == OPLOCK_ACK_WAIT) {
843 INIT_WORK(&work->work, __smb2_lease_break_noti);
844 ksmbd_queue_work(work);
845 wait_for_break_ack(opinfo);
846 } else {
847 __smb2_lease_break_noti(&work->work);
848 if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) {
849 opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
850 opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
851 }
852 }
853 return 0;
854 }
855
wait_lease_breaking(struct oplock_info * opinfo)856 static void wait_lease_breaking(struct oplock_info *opinfo)
857 {
858 if (!opinfo->is_lease)
859 return;
860
861 wake_up_interruptible_all(&opinfo->oplock_brk);
862 if (atomic_read(&opinfo->breaking_cnt)) {
863 int ret = 0;
864
865 ret = wait_event_interruptible_timeout(opinfo->oplock_brk,
866 atomic_read(&opinfo->breaking_cnt) == 0,
867 HZ);
868 if (!ret)
869 atomic_set(&opinfo->breaking_cnt, 0);
870 }
871 }
872
oplock_break(struct oplock_info * brk_opinfo,int req_op_level,struct ksmbd_work * in_work)873 static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level,
874 struct ksmbd_work *in_work)
875 {
876 int err = 0;
877
878 /* Need to break exclusive/batch oplock, write lease or overwrite_if */
879 ksmbd_debug(OPLOCK,
880 "request to send oplock(level : 0x%x) break notification\n",
881 brk_opinfo->level);
882
883 if (brk_opinfo->is_lease) {
884 struct lease *lease = brk_opinfo->o_lease;
885
886 atomic_inc(&brk_opinfo->breaking_cnt);
887 err = oplock_break_pending(brk_opinfo, req_op_level);
888 if (err)
889 return err < 0 ? err : 0;
890
891 if (brk_opinfo->open_trunc) {
892 /*
893 * Create overwrite break trigger the lease break to
894 * none.
895 */
896 lease->new_state = SMB2_LEASE_NONE_LE;
897 } else {
898 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) {
899 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
900 lease->new_state =
901 SMB2_LEASE_READ_CACHING_LE |
902 SMB2_LEASE_HANDLE_CACHING_LE;
903 else
904 lease->new_state =
905 SMB2_LEASE_READ_CACHING_LE;
906 } else {
907 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE &&
908 !lease->is_dir)
909 lease->new_state =
910 SMB2_LEASE_READ_CACHING_LE;
911 else
912 lease->new_state = SMB2_LEASE_NONE_LE;
913 }
914 }
915
916 if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE |
917 SMB2_LEASE_HANDLE_CACHING_LE)) {
918 if (in_work) {
919 setup_async_work(in_work, NULL, NULL);
920 smb2_send_interim_resp(in_work, STATUS_PENDING);
921 release_async_work(in_work);
922 }
923
924 brk_opinfo->op_state = OPLOCK_ACK_WAIT;
925 } else
926 atomic_dec(&brk_opinfo->breaking_cnt);
927 } else {
928 err = oplock_break_pending(brk_opinfo, req_op_level);
929 if (err)
930 return err < 0 ? err : 0;
931
932 if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
933 brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
934 brk_opinfo->op_state = OPLOCK_ACK_WAIT;
935 }
936
937 if (brk_opinfo->is_lease)
938 err = smb2_lease_break_noti(brk_opinfo);
939 else
940 err = smb2_oplock_break_noti(brk_opinfo);
941
942 ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level);
943 if (brk_opinfo->op_state == OPLOCK_CLOSING)
944 err = -ENOENT;
945 wake_up_oplock_break(brk_opinfo);
946
947 wait_lease_breaking(brk_opinfo);
948
949 return err;
950 }
951
destroy_lease_table(struct ksmbd_conn * conn)952 void destroy_lease_table(struct ksmbd_conn *conn)
953 {
954 struct lease_table *lb, *lbtmp;
955 struct oplock_info *opinfo;
956
957 write_lock(&lease_list_lock);
958 if (list_empty(&lease_table_list)) {
959 write_unlock(&lease_list_lock);
960 return;
961 }
962
963 list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) {
964 if (conn && memcmp(lb->client_guid, conn->ClientGUID,
965 SMB2_CLIENT_GUID_SIZE))
966 continue;
967 again:
968 rcu_read_lock();
969 list_for_each_entry_rcu(opinfo, &lb->lease_list,
970 lease_entry) {
971 rcu_read_unlock();
972 lease_del_list(opinfo);
973 goto again;
974 }
975 rcu_read_unlock();
976 list_del(&lb->l_entry);
977 kfree(lb);
978 }
979 write_unlock(&lease_list_lock);
980 }
981
find_same_lease_key(struct ksmbd_session * sess,struct ksmbd_inode * ci,struct lease_ctx_info * lctx)982 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
983 struct lease_ctx_info *lctx)
984 {
985 struct oplock_info *opinfo;
986 int err = 0;
987 struct lease_table *lb;
988
989 if (!lctx)
990 return err;
991
992 read_lock(&lease_list_lock);
993 if (list_empty(&lease_table_list)) {
994 read_unlock(&lease_list_lock);
995 return 0;
996 }
997
998 list_for_each_entry(lb, &lease_table_list, l_entry) {
999 if (!memcmp(lb->client_guid, sess->ClientGUID,
1000 SMB2_CLIENT_GUID_SIZE))
1001 goto found;
1002 }
1003 read_unlock(&lease_list_lock);
1004
1005 return 0;
1006
1007 found:
1008 rcu_read_lock();
1009 list_for_each_entry_rcu(opinfo, &lb->lease_list, lease_entry) {
1010 if (!atomic_inc_not_zero(&opinfo->refcount))
1011 continue;
1012 rcu_read_unlock();
1013 if (opinfo->o_fp->f_ci == ci)
1014 goto op_next;
1015 err = compare_guid_key(opinfo, sess->ClientGUID,
1016 lctx->lease_key);
1017 if (err) {
1018 err = -EINVAL;
1019 ksmbd_debug(OPLOCK,
1020 "found same lease key is already used in other files\n");
1021 opinfo_put(opinfo);
1022 goto out;
1023 }
1024 op_next:
1025 opinfo_put(opinfo);
1026 rcu_read_lock();
1027 }
1028 rcu_read_unlock();
1029
1030 out:
1031 read_unlock(&lease_list_lock);
1032 return err;
1033 }
1034
copy_lease(struct oplock_info * op1,struct oplock_info * op2)1035 static void copy_lease(struct oplock_info *op1, struct oplock_info *op2)
1036 {
1037 struct lease *lease1 = op1->o_lease;
1038 struct lease *lease2 = op2->o_lease;
1039
1040 op2->level = op1->level;
1041 lease2->state = lease1->state;
1042 memcpy(lease2->lease_key, lease1->lease_key,
1043 SMB2_LEASE_KEY_SIZE);
1044 lease2->duration = lease1->duration;
1045 lease2->flags = lease1->flags;
1046 lease2->epoch = lease1->epoch;
1047 lease2->version = lease1->version;
1048 }
1049
add_lease_global_list(struct oplock_info * opinfo,struct lease_table * new_lb)1050 static void add_lease_global_list(struct oplock_info *opinfo,
1051 struct lease_table *new_lb)
1052 {
1053 struct lease_table *lb;
1054
1055 write_lock(&lease_list_lock);
1056 list_for_each_entry(lb, &lease_table_list, l_entry) {
1057 if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID,
1058 SMB2_CLIENT_GUID_SIZE)) {
1059 opinfo->o_lease->l_lb = lb;
1060 lease_add_list(opinfo);
1061 write_unlock(&lease_list_lock);
1062 kfree(new_lb);
1063 return;
1064 }
1065 }
1066
1067 opinfo->o_lease->l_lb = new_lb;
1068 lease_add_list(opinfo);
1069 list_add(&new_lb->l_entry, &lease_table_list);
1070 write_unlock(&lease_list_lock);
1071 }
1072
set_oplock_level(struct oplock_info * opinfo,int level,struct lease_ctx_info * lctx)1073 static void set_oplock_level(struct oplock_info *opinfo, int level,
1074 struct lease_ctx_info *lctx)
1075 {
1076 switch (level) {
1077 case SMB2_OPLOCK_LEVEL_BATCH:
1078 case SMB2_OPLOCK_LEVEL_EXCLUSIVE:
1079 grant_write_oplock(opinfo, level, lctx);
1080 break;
1081 case SMB2_OPLOCK_LEVEL_II:
1082 grant_read_oplock(opinfo, lctx);
1083 break;
1084 default:
1085 grant_none_oplock(opinfo, lctx);
1086 break;
1087 }
1088 }
1089
smb_send_parent_lease_break_noti(struct ksmbd_file * fp,struct lease_ctx_info * lctx)1090 void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
1091 struct lease_ctx_info *lctx)
1092 {
1093 struct oplock_info *opinfo;
1094 struct ksmbd_inode *p_ci = NULL;
1095
1096 if (lctx->version != 2)
1097 return;
1098
1099 p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
1100 if (!p_ci)
1101 return;
1102
1103 down_read(&p_ci->m_lock);
1104 list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) {
1105 if (opinfo->conn == NULL || !opinfo->is_lease)
1106 continue;
1107
1108 if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE &&
1109 (!(lctx->flags & SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE) ||
1110 !compare_guid_key(opinfo, fp->conn->ClientGUID,
1111 lctx->parent_lease_key))) {
1112 if (!atomic_inc_not_zero(&opinfo->refcount))
1113 continue;
1114
1115 if (ksmbd_conn_releasing(opinfo->conn)) {
1116 opinfo_put(opinfo);
1117 continue;
1118 }
1119
1120 oplock_break(opinfo, SMB2_OPLOCK_LEVEL_NONE, NULL);
1121 opinfo_put(opinfo);
1122 }
1123 }
1124 up_read(&p_ci->m_lock);
1125
1126 ksmbd_inode_put(p_ci);
1127 }
1128
smb_lazy_parent_lease_break_close(struct ksmbd_file * fp)1129 void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp)
1130 {
1131 struct oplock_info *opinfo;
1132 struct ksmbd_inode *p_ci = NULL;
1133
1134 rcu_read_lock();
1135 opinfo = rcu_dereference(fp->f_opinfo);
1136
1137 if (!opinfo || !opinfo->is_lease || opinfo->o_lease->version != 2) {
1138 rcu_read_unlock();
1139 return;
1140 }
1141 rcu_read_unlock();
1142
1143 p_ci = ksmbd_inode_lookup_lock(fp->filp->f_path.dentry->d_parent);
1144 if (!p_ci)
1145 return;
1146
1147 down_read(&p_ci->m_lock);
1148 list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) {
1149 if (opinfo->conn == NULL || !opinfo->is_lease)
1150 continue;
1151
1152 if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE) {
1153 if (!atomic_inc_not_zero(&opinfo->refcount))
1154 continue;
1155
1156 if (ksmbd_conn_releasing(opinfo->conn)) {
1157 opinfo_put(opinfo);
1158 continue;
1159 }
1160
1161 oplock_break(opinfo, SMB2_OPLOCK_LEVEL_NONE, NULL);
1162 opinfo_put(opinfo);
1163 }
1164 }
1165 up_read(&p_ci->m_lock);
1166
1167 ksmbd_inode_put(p_ci);
1168 }
1169
1170 /**
1171 * smb_grant_oplock() - handle oplock/lease request on file open
1172 * @work: smb work
1173 * @req_op_level: oplock level
1174 * @pid: id of open file
1175 * @fp: ksmbd file pointer
1176 * @tid: Tree id of connection
1177 * @lctx: lease context information on file open
1178 * @share_ret: share mode
1179 *
1180 * Return: 0 on success, otherwise error
1181 */
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)1182 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid,
1183 struct ksmbd_file *fp, __u16 tid,
1184 struct lease_ctx_info *lctx, int share_ret)
1185 {
1186 struct ksmbd_session *sess = work->sess;
1187 int err = 0;
1188 struct oplock_info *opinfo = NULL, *prev_opinfo = NULL;
1189 struct ksmbd_inode *ci = fp->f_ci;
1190 struct lease_table *new_lb = NULL;
1191 bool prev_op_has_lease;
1192 __le32 prev_op_state = 0;
1193
1194 /* Only v2 leases handle the directory */
1195 if (S_ISDIR(file_inode(fp->filp)->i_mode)) {
1196 if (!lctx || lctx->version != 2 ||
1197 (lctx->flags != SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE &&
1198 !lctx->epoch))
1199 return 0;
1200 }
1201
1202 opinfo = alloc_opinfo(work, pid, tid);
1203 if (!opinfo)
1204 return -ENOMEM;
1205
1206 if (lctx) {
1207 err = alloc_lease(opinfo, lctx);
1208 if (err)
1209 goto err_out;
1210 opinfo->is_lease = 1;
1211 }
1212
1213 /* ci does not have any oplock */
1214 if (!opinfo_count(fp))
1215 goto set_lev;
1216
1217 /* grant none-oplock if second open is trunc */
1218 if (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE &&
1219 fp->cdoption != FILE_OVERWRITE_LE &&
1220 fp->cdoption != FILE_SUPERSEDE_LE) {
1221 req_op_level = SMB2_OPLOCK_LEVEL_NONE;
1222 goto set_lev;
1223 }
1224
1225 if (lctx) {
1226 struct oplock_info *m_opinfo;
1227
1228 /* is lease already granted ? */
1229 m_opinfo = same_client_has_lease(ci, sess->ClientGUID,
1230 lctx);
1231 if (m_opinfo) {
1232 copy_lease(m_opinfo, opinfo);
1233 if (atomic_read(&m_opinfo->breaking_cnt))
1234 opinfo->o_lease->flags =
1235 SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE;
1236 goto out;
1237 }
1238 }
1239 prev_opinfo = opinfo_get_list(ci);
1240 if (!prev_opinfo ||
1241 (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) {
1242 opinfo_put(prev_opinfo);
1243 goto set_lev;
1244 }
1245 prev_op_has_lease = prev_opinfo->is_lease;
1246 if (prev_op_has_lease)
1247 prev_op_state = prev_opinfo->o_lease->state;
1248
1249 if (share_ret < 0 &&
1250 prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1251 err = share_ret;
1252 opinfo_put(prev_opinfo);
1253 goto err_out;
1254 }
1255
1256 if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
1257 prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1258 opinfo_put(prev_opinfo);
1259 goto op_break_not_needed;
1260 }
1261
1262 err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II, work);
1263 opinfo_put(prev_opinfo);
1264 if (err == -ENOENT)
1265 goto set_lev;
1266 /* Check all oplock was freed by close */
1267 else if (err < 0)
1268 goto err_out;
1269
1270 op_break_not_needed:
1271 if (share_ret < 0) {
1272 err = share_ret;
1273 goto err_out;
1274 }
1275
1276 if (req_op_level != SMB2_OPLOCK_LEVEL_NONE)
1277 req_op_level = SMB2_OPLOCK_LEVEL_II;
1278
1279 /* grant fixed oplock on stacked locking between lease and oplock */
1280 if (prev_op_has_lease && !lctx)
1281 if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE)
1282 req_op_level = SMB2_OPLOCK_LEVEL_NONE;
1283
1284 if (!prev_op_has_lease && lctx) {
1285 req_op_level = SMB2_OPLOCK_LEVEL_II;
1286 lctx->req_state = SMB2_LEASE_READ_CACHING_LE;
1287 }
1288
1289 set_lev:
1290 set_oplock_level(opinfo, req_op_level, lctx);
1291
1292 out:
1293 /*
1294 * Set o_fp before any publication so that concurrent readers
1295 * (e.g. find_same_lease_key() on the lease list) that
1296 * dereference opinfo->o_fp don't hit a NULL pointer.
1297 *
1298 * Keep the original publication order so concurrent opens can
1299 * still observe the in-flight grant via ci->m_op_list, but make
1300 * everything after opinfo_add() no-fail by preallocating any new
1301 * lease_table first.
1302 */
1303 opinfo->o_fp = fp;
1304 if (opinfo->is_lease) {
1305 new_lb = alloc_lease_table(opinfo);
1306 if (!new_lb) {
1307 err = -ENOMEM;
1308 goto err_out;
1309 }
1310 }
1311
1312 opinfo_count_inc(fp);
1313 opinfo_add(opinfo, fp);
1314
1315 if (opinfo->is_lease)
1316 add_lease_global_list(opinfo, new_lb);
1317
1318 rcu_assign_pointer(fp->f_opinfo, opinfo);
1319
1320 return 0;
1321 err_out:
1322 kfree(new_lb);
1323 opinfo_put(opinfo);
1324 return err;
1325 }
1326
1327 /**
1328 * smb_break_all_write_oplock() - break batch/exclusive oplock to level2
1329 * @work: smb work
1330 * @fp: ksmbd file pointer
1331 * @is_trunc: truncate on open
1332 */
smb_break_all_write_oplock(struct ksmbd_work * work,struct ksmbd_file * fp,int is_trunc)1333 static void smb_break_all_write_oplock(struct ksmbd_work *work,
1334 struct ksmbd_file *fp, int is_trunc)
1335 {
1336 struct oplock_info *brk_opinfo;
1337
1338 brk_opinfo = opinfo_get_list(fp->f_ci);
1339 if (!brk_opinfo)
1340 return;
1341 if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
1342 brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1343 opinfo_put(brk_opinfo);
1344 return;
1345 }
1346
1347 brk_opinfo->open_trunc = is_trunc;
1348 oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II, work);
1349 opinfo_put(brk_opinfo);
1350 }
1351
1352 /**
1353 * smb_break_all_levII_oplock() - send level2 oplock or read lease break command
1354 * from server to client
1355 * @work: smb work
1356 * @fp: ksmbd file pointer
1357 * @is_trunc: truncate on open
1358 */
smb_break_all_levII_oplock(struct ksmbd_work * work,struct ksmbd_file * fp,int is_trunc)1359 void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp,
1360 int is_trunc)
1361 {
1362 struct oplock_info *op, *brk_op;
1363 struct ksmbd_inode *ci;
1364 struct ksmbd_conn *conn = work->conn;
1365
1366 if (!test_share_config_flag(work->tcon->share_conf,
1367 KSMBD_SHARE_FLAG_OPLOCKS))
1368 return;
1369
1370 ci = fp->f_ci;
1371 op = opinfo_get(fp);
1372
1373 down_read(&ci->m_lock);
1374 list_for_each_entry(brk_op, &ci->m_op_list, op_entry) {
1375 if (brk_op->conn == NULL)
1376 continue;
1377
1378 if (!atomic_inc_not_zero(&brk_op->refcount))
1379 continue;
1380
1381 if (ksmbd_conn_releasing(brk_op->conn)) {
1382 opinfo_put(brk_op);
1383 continue;
1384 }
1385
1386 if (brk_op->is_lease && (brk_op->o_lease->state &
1387 (~(SMB2_LEASE_READ_CACHING_LE |
1388 SMB2_LEASE_HANDLE_CACHING_LE)))) {
1389 ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n",
1390 brk_op->o_lease->state);
1391 goto next;
1392 } else if (brk_op->level !=
1393 SMB2_OPLOCK_LEVEL_II) {
1394 ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n",
1395 brk_op->level);
1396 goto next;
1397 }
1398
1399 /* Skip oplock being break to none */
1400 if (brk_op->is_lease &&
1401 brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE &&
1402 atomic_read(&brk_op->breaking_cnt))
1403 goto next;
1404
1405 if (op && op->is_lease && brk_op->is_lease &&
1406 !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID,
1407 SMB2_CLIENT_GUID_SIZE) &&
1408 !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key,
1409 SMB2_LEASE_KEY_SIZE))
1410 goto next;
1411 brk_op->open_trunc = is_trunc;
1412 oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE, NULL);
1413 next:
1414 opinfo_put(brk_op);
1415 }
1416 up_read(&ci->m_lock);
1417
1418 if (op)
1419 opinfo_put(op);
1420 }
1421
1422 /**
1423 * smb_break_all_oplock() - break both batch/exclusive and level2 oplock
1424 * @work: smb work
1425 * @fp: ksmbd file pointer
1426 */
smb_break_all_oplock(struct ksmbd_work * work,struct ksmbd_file * fp)1427 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp)
1428 {
1429 if (!test_share_config_flag(work->tcon->share_conf,
1430 KSMBD_SHARE_FLAG_OPLOCKS))
1431 return;
1432
1433 smb_break_all_write_oplock(work, fp, 1);
1434 smb_break_all_levII_oplock(work, fp, 1);
1435 }
1436
1437 /**
1438 * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type
1439 * @lease_state: lease type
1440 *
1441 * Return: 0 if no mapping, otherwise corresponding oplock type
1442 */
smb2_map_lease_to_oplock(__le32 lease_state)1443 __u8 smb2_map_lease_to_oplock(__le32 lease_state)
1444 {
1445 if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE |
1446 SMB2_LEASE_READ_CACHING_LE |
1447 SMB2_LEASE_WRITE_CACHING_LE)) {
1448 return SMB2_OPLOCK_LEVEL_BATCH;
1449 } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE &&
1450 lease_state & SMB2_LEASE_WRITE_CACHING_LE) {
1451 if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE))
1452 return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
1453 } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) {
1454 return SMB2_OPLOCK_LEVEL_II;
1455 }
1456 return 0;
1457 }
1458
1459 /**
1460 * create_lease_buf() - create lease context for open cmd response
1461 * @rbuf: buffer to create lease context response
1462 * @lease: buffer to stored parsed lease state information
1463 */
create_lease_buf(u8 * rbuf,struct lease * lease)1464 void create_lease_buf(u8 *rbuf, struct lease *lease)
1465 {
1466 if (lease->version == 2) {
1467 struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf;
1468
1469 memset(buf, 0, sizeof(struct create_lease_v2));
1470 memcpy(buf->lcontext.LeaseKey, lease->lease_key,
1471 SMB2_LEASE_KEY_SIZE);
1472 buf->lcontext.LeaseFlags = lease->flags;
1473 buf->lcontext.Epoch = cpu_to_le16(lease->epoch);
1474 buf->lcontext.LeaseState = lease->state;
1475 if (lease->flags == SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE)
1476 memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key,
1477 SMB2_LEASE_KEY_SIZE);
1478 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1479 (struct create_lease_v2, lcontext));
1480 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
1481 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1482 (struct create_lease_v2, Name));
1483 buf->ccontext.NameLength = cpu_to_le16(4);
1484 buf->Name[0] = 'R';
1485 buf->Name[1] = 'q';
1486 buf->Name[2] = 'L';
1487 buf->Name[3] = 's';
1488 } else {
1489 struct create_lease *buf = (struct create_lease *)rbuf;
1490
1491 memset(buf, 0, sizeof(struct create_lease));
1492 memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE);
1493 buf->lcontext.LeaseFlags = lease->flags;
1494 buf->lcontext.LeaseState = lease->state;
1495 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1496 (struct create_lease, lcontext));
1497 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1498 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1499 (struct create_lease, Name));
1500 buf->ccontext.NameLength = cpu_to_le16(4);
1501 buf->Name[0] = 'R';
1502 buf->Name[1] = 'q';
1503 buf->Name[2] = 'L';
1504 buf->Name[3] = 's';
1505 }
1506 }
1507
1508 /**
1509 * parse_lease_state() - parse lease context contained in file open request
1510 * @open_req: buffer containing smb2 file open(create) request
1511 *
1512 * Return: allocated lease context object on success, otherwise NULL
1513 */
parse_lease_state(void * open_req)1514 struct lease_ctx_info *parse_lease_state(void *open_req)
1515 {
1516 struct create_context *cc;
1517 struct smb2_create_req *req = (struct smb2_create_req *)open_req;
1518 struct lease_ctx_info *lreq;
1519
1520 cc = smb2_find_context_vals(req, SMB2_CREATE_REQUEST_LEASE, 4);
1521 if (IS_ERR_OR_NULL(cc))
1522 return NULL;
1523
1524 lreq = kzalloc_obj(struct lease_ctx_info, KSMBD_DEFAULT_GFP);
1525 if (!lreq)
1526 return NULL;
1527
1528 if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) {
1529 struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
1530
1531 if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) <
1532 sizeof(struct create_lease_v2) - 4)
1533 goto err_out;
1534
1535 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
1536 lreq->req_state = lc->lcontext.LeaseState;
1537 lreq->flags = lc->lcontext.LeaseFlags;
1538 lreq->epoch = lc->lcontext.Epoch;
1539 lreq->duration = lc->lcontext.LeaseDuration;
1540 if (lreq->flags == SMB2_LEASE_FLAG_PARENT_LEASE_KEY_SET_LE)
1541 memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey,
1542 SMB2_LEASE_KEY_SIZE);
1543 lreq->version = 2;
1544 } else {
1545 struct create_lease *lc = (struct create_lease *)cc;
1546
1547 if (le16_to_cpu(cc->DataOffset) + le32_to_cpu(cc->DataLength) <
1548 sizeof(struct create_lease))
1549 goto err_out;
1550
1551 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
1552 lreq->req_state = lc->lcontext.LeaseState;
1553 lreq->flags = lc->lcontext.LeaseFlags;
1554 lreq->duration = lc->lcontext.LeaseDuration;
1555 lreq->version = 1;
1556 }
1557 return lreq;
1558 err_out:
1559 kfree(lreq);
1560 return NULL;
1561 }
1562
1563 /**
1564 * smb2_find_context_vals() - find a particular context info in open request
1565 * @open_req: buffer containing smb2 file open(create) request
1566 * @tag: context name to search for
1567 * @tag_len: the length of tag
1568 *
1569 * Return: pointer to requested context, NULL if @str context not found
1570 * or error pointer if name length is invalid.
1571 */
smb2_find_context_vals(void * open_req,const char * tag,int tag_len)1572 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len)
1573 {
1574 struct create_context *cc;
1575 unsigned int next = 0;
1576 char *name;
1577 struct smb2_create_req *req = (struct smb2_create_req *)open_req;
1578 unsigned int remain_len, name_off, name_len, value_off, value_len,
1579 cc_len;
1580
1581 /*
1582 * CreateContextsOffset and CreateContextsLength are guaranteed to
1583 * be valid because of ksmbd_smb2_check_message().
1584 */
1585 cc = (struct create_context *)((char *)req +
1586 le32_to_cpu(req->CreateContextsOffset));
1587 remain_len = le32_to_cpu(req->CreateContextsLength);
1588 do {
1589 cc = (struct create_context *)((char *)cc + next);
1590 if (remain_len < offsetof(struct create_context, Buffer))
1591 return ERR_PTR(-EINVAL);
1592
1593 next = le32_to_cpu(cc->Next);
1594 name_off = le16_to_cpu(cc->NameOffset);
1595 name_len = le16_to_cpu(cc->NameLength);
1596 value_off = le16_to_cpu(cc->DataOffset);
1597 value_len = le32_to_cpu(cc->DataLength);
1598 cc_len = next ? next : remain_len;
1599
1600 if ((next & 0x7) != 0 ||
1601 next > remain_len ||
1602 name_off != offsetof(struct create_context, Buffer) ||
1603 name_len < 4 ||
1604 name_off + name_len > cc_len ||
1605 (value_off & 0x7) != 0 ||
1606 (value_len && value_off < name_off + (name_len < 8 ? 8 : name_len)) ||
1607 ((u64)value_off + value_len > cc_len))
1608 return ERR_PTR(-EINVAL);
1609
1610 name = (char *)cc + name_off;
1611 if (name_len == tag_len && !memcmp(name, tag, name_len))
1612 return cc;
1613
1614 remain_len -= next;
1615 } while (next != 0);
1616
1617 return NULL;
1618 }
1619
1620 /**
1621 * create_durable_rsp_buf() - create durable handle context
1622 * @cc: buffer to create durable context response
1623 */
create_durable_rsp_buf(char * cc)1624 void create_durable_rsp_buf(char *cc)
1625 {
1626 struct create_durable_rsp *buf;
1627
1628 buf = (struct create_durable_rsp *)cc;
1629 memset(buf, 0, sizeof(struct create_durable_rsp));
1630 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1631 (struct create_durable_rsp, Data));
1632 buf->ccontext.DataLength = cpu_to_le32(8);
1633 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1634 (struct create_durable_rsp, Name));
1635 buf->ccontext.NameLength = cpu_to_le16(4);
1636 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */
1637 buf->Name[0] = 'D';
1638 buf->Name[1] = 'H';
1639 buf->Name[2] = 'n';
1640 buf->Name[3] = 'Q';
1641 }
1642
1643 /**
1644 * create_durable_v2_rsp_buf() - create durable handle v2 context
1645 * @cc: buffer to create durable context response
1646 * @fp: ksmbd file pointer
1647 */
create_durable_v2_rsp_buf(char * cc,struct ksmbd_file * fp)1648 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp)
1649 {
1650 struct create_durable_rsp_v2 *buf;
1651
1652 buf = (struct create_durable_rsp_v2 *)cc;
1653 memset(buf, 0, sizeof(struct create_durable_rsp));
1654 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1655 (struct create_durable_rsp, Data));
1656 buf->ccontext.DataLength = cpu_to_le32(8);
1657 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1658 (struct create_durable_rsp, Name));
1659 buf->ccontext.NameLength = cpu_to_le16(4);
1660 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */
1661 buf->Name[0] = 'D';
1662 buf->Name[1] = 'H';
1663 buf->Name[2] = '2';
1664 buf->Name[3] = 'Q';
1665
1666 buf->dcontext.Timeout = cpu_to_le32(fp->durable_timeout);
1667 if (fp->is_persistent)
1668 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1669 }
1670
1671 /**
1672 * create_mxac_rsp_buf() - create query maximal access context
1673 * @cc: buffer to create maximal access context response
1674 * @maximal_access: maximal access
1675 */
create_mxac_rsp_buf(char * cc,int maximal_access)1676 void create_mxac_rsp_buf(char *cc, int maximal_access)
1677 {
1678 struct create_mxac_rsp *buf;
1679
1680 buf = (struct create_mxac_rsp *)cc;
1681 memset(buf, 0, sizeof(struct create_mxac_rsp));
1682 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1683 (struct create_mxac_rsp, QueryStatus));
1684 buf->ccontext.DataLength = cpu_to_le32(8);
1685 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1686 (struct create_mxac_rsp, Name));
1687 buf->ccontext.NameLength = cpu_to_le16(4);
1688 /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */
1689 buf->Name[0] = 'M';
1690 buf->Name[1] = 'x';
1691 buf->Name[2] = 'A';
1692 buf->Name[3] = 'c';
1693
1694 buf->QueryStatus = STATUS_SUCCESS;
1695 buf->MaximalAccess = cpu_to_le32(maximal_access);
1696 }
1697
create_disk_id_rsp_buf(char * cc,__u64 file_id,__u64 vol_id)1698 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id)
1699 {
1700 struct create_disk_id_rsp *buf;
1701
1702 buf = (struct create_disk_id_rsp *)cc;
1703 memset(buf, 0, sizeof(struct create_disk_id_rsp));
1704 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1705 (struct create_disk_id_rsp, DiskFileId));
1706 buf->ccontext.DataLength = cpu_to_le32(32);
1707 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1708 (struct create_mxac_rsp, Name));
1709 buf->ccontext.NameLength = cpu_to_le16(4);
1710 /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */
1711 buf->Name[0] = 'Q';
1712 buf->Name[1] = 'F';
1713 buf->Name[2] = 'i';
1714 buf->Name[3] = 'd';
1715
1716 buf->DiskFileId = cpu_to_le64(file_id);
1717 buf->VolumeId = cpu_to_le64(vol_id);
1718 }
1719
1720 /**
1721 * create_posix_rsp_buf() - create posix extension context
1722 * @cc: buffer to create posix on posix response
1723 * @fp: ksmbd file pointer
1724 */
create_posix_rsp_buf(char * cc,struct ksmbd_file * fp)1725 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
1726 {
1727 struct create_posix_rsp *buf;
1728 struct inode *inode = file_inode(fp->filp);
1729 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
1730 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
1731 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
1732
1733 buf = (struct create_posix_rsp *)cc;
1734 memset(buf, 0, sizeof(struct create_posix_rsp));
1735 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1736 (struct create_posix_rsp, nlink));
1737 /*
1738 * DataLength = nlink(4) + reparse_tag(4) + mode(4) +
1739 * domain sid(28) + unix group sid(16).
1740 */
1741 buf->ccontext.DataLength = cpu_to_le32(56);
1742 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1743 (struct create_posix_rsp, Name));
1744 buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
1745 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
1746 buf->Name[0] = 0x93;
1747 buf->Name[1] = 0xAD;
1748 buf->Name[2] = 0x25;
1749 buf->Name[3] = 0x50;
1750 buf->Name[4] = 0x9C;
1751 buf->Name[5] = 0xB4;
1752 buf->Name[6] = 0x11;
1753 buf->Name[7] = 0xE7;
1754 buf->Name[8] = 0xB4;
1755 buf->Name[9] = 0x23;
1756 buf->Name[10] = 0x83;
1757 buf->Name[11] = 0xDE;
1758 buf->Name[12] = 0x96;
1759 buf->Name[13] = 0x8B;
1760 buf->Name[14] = 0xCD;
1761 buf->Name[15] = 0x7C;
1762
1763 buf->nlink = cpu_to_le32(inode->i_nlink);
1764 buf->reparse_tag = cpu_to_le32(fp->volatile_id);
1765 buf->mode = cpu_to_le32(inode->i_mode & 0777);
1766 /*
1767 * SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)).
1768 * Domain sid(28) = revision(1) + num_subauth(1) + authority(6) +
1769 * sub_auth(4 * 4(num_subauth)) + RID(4).
1770 * UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) +
1771 * sub_auth(4 * 1(num_subauth)) + RID(4).
1772 */
1773 id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)),
1774 SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]);
1775 id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)),
1776 SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]);
1777 }
1778
1779 /*
1780 * Find lease object(opinfo) for given lease key/fid from lease
1781 * break/file close path.
1782 */
1783 /**
1784 * lookup_lease_in_table() - find a matching lease info object
1785 * @conn: connection instance
1786 * @lease_key: lease key to be searched for
1787 *
1788 * Return: opinfo if found matching opinfo, otherwise NULL
1789 */
lookup_lease_in_table(struct ksmbd_conn * conn,char * lease_key)1790 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
1791 char *lease_key)
1792 {
1793 struct oplock_info *opinfo = NULL, *ret_op = NULL;
1794 struct lease_table *lt;
1795 int ret;
1796
1797 read_lock(&lease_list_lock);
1798 list_for_each_entry(lt, &lease_table_list, l_entry) {
1799 if (!memcmp(lt->client_guid, conn->ClientGUID,
1800 SMB2_CLIENT_GUID_SIZE))
1801 goto found;
1802 }
1803
1804 read_unlock(&lease_list_lock);
1805 return NULL;
1806
1807 found:
1808 rcu_read_lock();
1809 list_for_each_entry_rcu(opinfo, <->lease_list, lease_entry) {
1810 if (!atomic_inc_not_zero(&opinfo->refcount))
1811 continue;
1812 rcu_read_unlock();
1813 if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING)
1814 goto op_next;
1815 if (!(opinfo->o_lease->state &
1816 (SMB2_LEASE_HANDLE_CACHING_LE |
1817 SMB2_LEASE_WRITE_CACHING_LE)))
1818 goto op_next;
1819 ret = compare_guid_key(opinfo, conn->ClientGUID,
1820 lease_key);
1821 if (ret) {
1822 ksmbd_debug(OPLOCK, "found opinfo\n");
1823 ret_op = opinfo;
1824 goto out;
1825 }
1826 op_next:
1827 opinfo_put(opinfo);
1828 rcu_read_lock();
1829 }
1830 rcu_read_unlock();
1831
1832 out:
1833 read_unlock(&lease_list_lock);
1834 return ret_op;
1835 }
1836
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)1837 int smb2_check_durable_oplock(struct ksmbd_conn *conn,
1838 struct ksmbd_share_config *share,
1839 struct ksmbd_file *fp,
1840 struct lease_ctx_info *lctx,
1841 struct ksmbd_user *user,
1842 char *name)
1843 {
1844 struct oplock_info *opinfo = opinfo_get(fp);
1845 int ret = 0;
1846
1847 if (!opinfo)
1848 return 0;
1849
1850 if (ksmbd_vfs_compare_durable_owner(fp, user) == false) {
1851 ksmbd_debug(SMB, "Durable handle reconnect failed: owner mismatch\n");
1852 ret = -EBADF;
1853 goto out;
1854 }
1855
1856 if (opinfo->is_lease == false) {
1857 if (lctx) {
1858 pr_err("create context include lease\n");
1859 ret = -EBADF;
1860 goto out;
1861 }
1862
1863 if (opinfo->level != SMB2_OPLOCK_LEVEL_BATCH) {
1864 pr_err("oplock level is not equal to SMB2_OPLOCK_LEVEL_BATCH\n");
1865 ret = -EBADF;
1866 }
1867
1868 goto out;
1869 }
1870
1871 if (memcmp(conn->ClientGUID, fp->client_guid,
1872 SMB2_CLIENT_GUID_SIZE)) {
1873 ksmbd_debug(SMB, "Client guid of fp is not equal to the one of connection\n");
1874 ret = -EBADF;
1875 goto out;
1876 }
1877
1878 if (!lctx) {
1879 ksmbd_debug(SMB, "create context does not include lease\n");
1880 ret = -EBADF;
1881 goto out;
1882 }
1883
1884 if (memcmp(opinfo->o_lease->lease_key, lctx->lease_key,
1885 SMB2_LEASE_KEY_SIZE)) {
1886 ksmbd_debug(SMB,
1887 "lease key of fp does not match lease key in create context\n");
1888 ret = -EBADF;
1889 goto out;
1890 }
1891
1892 if (!(opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE)) {
1893 ksmbd_debug(SMB, "lease state does not contain SMB2_LEASE_HANDLE_CACHING\n");
1894 ret = -EBADF;
1895 goto out;
1896 }
1897
1898 if (opinfo->o_lease->version != lctx->version) {
1899 ksmbd_debug(SMB,
1900 "lease version of fp does not match the one in create context\n");
1901 ret = -EBADF;
1902 goto out;
1903 }
1904
1905 if (!ksmbd_inode_pending_delete(fp))
1906 ret = ksmbd_validate_name_reconnect(share, fp, name);
1907 out:
1908 opinfo_put(opinfo);
1909 return ret;
1910 }
1911