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 "smbstatus.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 */ 30 static struct oplock_info *alloc_opinfo(struct ksmbd_work *work, 31 u64 id, __u16 Tid) 32 { 33 struct ksmbd_conn *conn = work->conn; 34 struct ksmbd_session *sess = work->sess; 35 struct oplock_info *opinfo; 36 37 opinfo = kzalloc(sizeof(struct oplock_info), GFP_KERNEL); 38 if (!opinfo) 39 return NULL; 40 41 opinfo->sess = sess; 42 opinfo->conn = conn; 43 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 44 opinfo->op_state = OPLOCK_STATE_NONE; 45 opinfo->pending_break = 0; 46 opinfo->fid = id; 47 opinfo->Tid = Tid; 48 INIT_LIST_HEAD(&opinfo->op_entry); 49 INIT_LIST_HEAD(&opinfo->interim_list); 50 init_waitqueue_head(&opinfo->oplock_q); 51 init_waitqueue_head(&opinfo->oplock_brk); 52 atomic_set(&opinfo->refcount, 1); 53 atomic_set(&opinfo->breaking_cnt, 0); 54 55 return opinfo; 56 } 57 58 static void lease_add_list(struct oplock_info *opinfo) 59 { 60 struct lease_table *lb = opinfo->o_lease->l_lb; 61 62 spin_lock(&lb->lb_lock); 63 list_add_rcu(&opinfo->lease_entry, &lb->lease_list); 64 spin_unlock(&lb->lb_lock); 65 } 66 67 static void lease_del_list(struct oplock_info *opinfo) 68 { 69 struct lease_table *lb = opinfo->o_lease->l_lb; 70 71 if (!lb) 72 return; 73 74 spin_lock(&lb->lb_lock); 75 if (list_empty(&opinfo->lease_entry)) { 76 spin_unlock(&lb->lb_lock); 77 return; 78 } 79 80 list_del_init(&opinfo->lease_entry); 81 opinfo->o_lease->l_lb = NULL; 82 spin_unlock(&lb->lb_lock); 83 } 84 85 static void lb_add(struct lease_table *lb) 86 { 87 write_lock(&lease_list_lock); 88 list_add(&lb->l_entry, &lease_table_list); 89 write_unlock(&lease_list_lock); 90 } 91 92 static int alloc_lease(struct oplock_info *opinfo, struct lease_ctx_info *lctx) 93 { 94 struct lease *lease; 95 96 lease = kmalloc(sizeof(struct lease), GFP_KERNEL); 97 if (!lease) 98 return -ENOMEM; 99 100 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE); 101 lease->state = lctx->req_state; 102 lease->new_state = 0; 103 lease->flags = lctx->flags; 104 lease->duration = lctx->duration; 105 memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE); 106 lease->version = lctx->version; 107 lease->epoch = 0; 108 INIT_LIST_HEAD(&opinfo->lease_entry); 109 opinfo->o_lease = lease; 110 111 return 0; 112 } 113 114 static void free_lease(struct oplock_info *opinfo) 115 { 116 struct lease *lease; 117 118 lease = opinfo->o_lease; 119 kfree(lease); 120 } 121 122 static void free_opinfo(struct oplock_info *opinfo) 123 { 124 if (opinfo->is_lease) 125 free_lease(opinfo); 126 kfree(opinfo); 127 } 128 129 static inline void opinfo_free_rcu(struct rcu_head *rcu_head) 130 { 131 struct oplock_info *opinfo; 132 133 opinfo = container_of(rcu_head, struct oplock_info, rcu_head); 134 free_opinfo(opinfo); 135 } 136 137 struct oplock_info *opinfo_get(struct ksmbd_file *fp) 138 { 139 struct oplock_info *opinfo; 140 141 rcu_read_lock(); 142 opinfo = rcu_dereference(fp->f_opinfo); 143 if (opinfo && !atomic_inc_not_zero(&opinfo->refcount)) 144 opinfo = NULL; 145 rcu_read_unlock(); 146 147 return opinfo; 148 } 149 150 static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci) 151 { 152 struct oplock_info *opinfo; 153 154 if (list_empty(&ci->m_op_list)) 155 return NULL; 156 157 rcu_read_lock(); 158 opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info, 159 op_entry); 160 if (opinfo) { 161 if (!atomic_inc_not_zero(&opinfo->refcount)) 162 opinfo = NULL; 163 else { 164 atomic_inc(&opinfo->conn->r_count); 165 if (ksmbd_conn_releasing(opinfo->conn)) { 166 atomic_dec(&opinfo->conn->r_count); 167 atomic_dec(&opinfo->refcount); 168 opinfo = NULL; 169 } 170 } 171 } 172 173 rcu_read_unlock(); 174 175 return opinfo; 176 } 177 178 static void opinfo_conn_put(struct oplock_info *opinfo) 179 { 180 struct ksmbd_conn *conn; 181 182 if (!opinfo) 183 return; 184 185 conn = opinfo->conn; 186 /* 187 * Checking waitqueue to dropping pending requests on 188 * disconnection. waitqueue_active is safe because it 189 * uses atomic operation for condition. 190 */ 191 if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q)) 192 wake_up(&conn->r_count_q); 193 opinfo_put(opinfo); 194 } 195 196 void opinfo_put(struct oplock_info *opinfo) 197 { 198 if (!atomic_dec_and_test(&opinfo->refcount)) 199 return; 200 201 call_rcu(&opinfo->rcu_head, opinfo_free_rcu); 202 } 203 204 static void opinfo_add(struct oplock_info *opinfo) 205 { 206 struct ksmbd_inode *ci = opinfo->o_fp->f_ci; 207 208 write_lock(&ci->m_lock); 209 list_add_rcu(&opinfo->op_entry, &ci->m_op_list); 210 write_unlock(&ci->m_lock); 211 } 212 213 static void opinfo_del(struct oplock_info *opinfo) 214 { 215 struct ksmbd_inode *ci = opinfo->o_fp->f_ci; 216 217 if (opinfo->is_lease) { 218 write_lock(&lease_list_lock); 219 lease_del_list(opinfo); 220 write_unlock(&lease_list_lock); 221 } 222 write_lock(&ci->m_lock); 223 list_del_rcu(&opinfo->op_entry); 224 write_unlock(&ci->m_lock); 225 } 226 227 static unsigned long opinfo_count(struct ksmbd_file *fp) 228 { 229 if (ksmbd_stream_fd(fp)) 230 return atomic_read(&fp->f_ci->sop_count); 231 else 232 return atomic_read(&fp->f_ci->op_count); 233 } 234 235 static void opinfo_count_inc(struct ksmbd_file *fp) 236 { 237 if (ksmbd_stream_fd(fp)) 238 return atomic_inc(&fp->f_ci->sop_count); 239 else 240 return atomic_inc(&fp->f_ci->op_count); 241 } 242 243 static void opinfo_count_dec(struct ksmbd_file *fp) 244 { 245 if (ksmbd_stream_fd(fp)) 246 return atomic_dec(&fp->f_ci->sop_count); 247 else 248 return atomic_dec(&fp->f_ci->op_count); 249 } 250 251 /** 252 * opinfo_write_to_read() - convert a write oplock to read oplock 253 * @opinfo: current oplock info 254 * 255 * Return: 0 on success, otherwise -EINVAL 256 */ 257 int opinfo_write_to_read(struct oplock_info *opinfo) 258 { 259 struct lease *lease = opinfo->o_lease; 260 261 if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH || 262 opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) { 263 pr_err("bad oplock(0x%x)\n", opinfo->level); 264 if (opinfo->is_lease) 265 pr_err("lease state(0x%x)\n", lease->state); 266 return -EINVAL; 267 } 268 opinfo->level = SMB2_OPLOCK_LEVEL_II; 269 270 if (opinfo->is_lease) 271 lease->state = lease->new_state; 272 return 0; 273 } 274 275 /** 276 * opinfo_read_handle_to_read() - convert a read/handle oplock to read oplock 277 * @opinfo: current oplock info 278 * 279 * Return: 0 on success, otherwise -EINVAL 280 */ 281 int opinfo_read_handle_to_read(struct oplock_info *opinfo) 282 { 283 struct lease *lease = opinfo->o_lease; 284 285 lease->state = lease->new_state; 286 opinfo->level = SMB2_OPLOCK_LEVEL_II; 287 return 0; 288 } 289 290 /** 291 * opinfo_write_to_none() - convert a write oplock to none 292 * @opinfo: current oplock info 293 * 294 * Return: 0 on success, otherwise -EINVAL 295 */ 296 int opinfo_write_to_none(struct oplock_info *opinfo) 297 { 298 struct lease *lease = opinfo->o_lease; 299 300 if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH || 301 opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) { 302 pr_err("bad oplock(0x%x)\n", opinfo->level); 303 if (opinfo->is_lease) 304 pr_err("lease state(0x%x)\n", lease->state); 305 return -EINVAL; 306 } 307 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 308 if (opinfo->is_lease) 309 lease->state = lease->new_state; 310 return 0; 311 } 312 313 /** 314 * opinfo_read_to_none() - convert a write read to none 315 * @opinfo: current oplock info 316 * 317 * Return: 0 on success, otherwise -EINVAL 318 */ 319 int opinfo_read_to_none(struct oplock_info *opinfo) 320 { 321 struct lease *lease = opinfo->o_lease; 322 323 if (opinfo->level != SMB2_OPLOCK_LEVEL_II) { 324 pr_err("bad oplock(0x%x)\n", opinfo->level); 325 if (opinfo->is_lease) 326 pr_err("lease state(0x%x)\n", lease->state); 327 return -EINVAL; 328 } 329 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 330 if (opinfo->is_lease) 331 lease->state = lease->new_state; 332 return 0; 333 } 334 335 /** 336 * lease_read_to_write() - upgrade lease state from read to write 337 * @opinfo: current lease info 338 * 339 * Return: 0 on success, otherwise -EINVAL 340 */ 341 int lease_read_to_write(struct oplock_info *opinfo) 342 { 343 struct lease *lease = opinfo->o_lease; 344 345 if (!(lease->state & SMB2_LEASE_READ_CACHING_LE)) { 346 ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state); 347 return -EINVAL; 348 } 349 350 lease->new_state = SMB2_LEASE_NONE_LE; 351 lease->state |= SMB2_LEASE_WRITE_CACHING_LE; 352 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 353 opinfo->level = SMB2_OPLOCK_LEVEL_BATCH; 354 else 355 opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE; 356 return 0; 357 } 358 359 /** 360 * lease_none_upgrade() - upgrade lease state from none 361 * @opinfo: current lease info 362 * @new_state: new lease state 363 * 364 * Return: 0 on success, otherwise -EINVAL 365 */ 366 static int lease_none_upgrade(struct oplock_info *opinfo, __le32 new_state) 367 { 368 struct lease *lease = opinfo->o_lease; 369 370 if (!(lease->state == SMB2_LEASE_NONE_LE)) { 371 ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state); 372 return -EINVAL; 373 } 374 375 lease->new_state = SMB2_LEASE_NONE_LE; 376 lease->state = new_state; 377 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 378 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) 379 opinfo->level = SMB2_OPLOCK_LEVEL_BATCH; 380 else 381 opinfo->level = SMB2_OPLOCK_LEVEL_II; 382 else if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) 383 opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE; 384 else if (lease->state & SMB2_LEASE_READ_CACHING_LE) 385 opinfo->level = SMB2_OPLOCK_LEVEL_II; 386 387 return 0; 388 } 389 390 /** 391 * close_id_del_oplock() - release oplock object at file close time 392 * @fp: ksmbd file pointer 393 */ 394 void close_id_del_oplock(struct ksmbd_file *fp) 395 { 396 struct oplock_info *opinfo; 397 398 if (S_ISDIR(file_inode(fp->filp)->i_mode)) 399 return; 400 401 opinfo = opinfo_get(fp); 402 if (!opinfo) 403 return; 404 405 opinfo_del(opinfo); 406 407 rcu_assign_pointer(fp->f_opinfo, NULL); 408 if (opinfo->op_state == OPLOCK_ACK_WAIT) { 409 opinfo->op_state = OPLOCK_CLOSING; 410 wake_up_interruptible_all(&opinfo->oplock_q); 411 if (opinfo->is_lease) { 412 atomic_set(&opinfo->breaking_cnt, 0); 413 wake_up_interruptible_all(&opinfo->oplock_brk); 414 } 415 } 416 417 opinfo_count_dec(fp); 418 atomic_dec(&opinfo->refcount); 419 opinfo_put(opinfo); 420 } 421 422 /** 423 * grant_write_oplock() - grant exclusive/batch oplock or write lease 424 * @opinfo_new: new oplock info object 425 * @req_oplock: request oplock 426 * @lctx: lease context information 427 * 428 * Return: 0 429 */ 430 static void grant_write_oplock(struct oplock_info *opinfo_new, int req_oplock, 431 struct lease_ctx_info *lctx) 432 { 433 struct lease *lease = opinfo_new->o_lease; 434 435 if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH) 436 opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH; 437 else 438 opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE; 439 440 if (lctx) { 441 lease->state = lctx->req_state; 442 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE); 443 } 444 } 445 446 /** 447 * grant_read_oplock() - grant level2 oplock or read lease 448 * @opinfo_new: new oplock info object 449 * @lctx: lease context information 450 * 451 * Return: 0 452 */ 453 static void grant_read_oplock(struct oplock_info *opinfo_new, 454 struct lease_ctx_info *lctx) 455 { 456 struct lease *lease = opinfo_new->o_lease; 457 458 opinfo_new->level = SMB2_OPLOCK_LEVEL_II; 459 460 if (lctx) { 461 lease->state = SMB2_LEASE_READ_CACHING_LE; 462 if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING_LE) 463 lease->state |= SMB2_LEASE_HANDLE_CACHING_LE; 464 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE); 465 } 466 } 467 468 /** 469 * grant_none_oplock() - grant none oplock or none lease 470 * @opinfo_new: new oplock info object 471 * @lctx: lease context information 472 * 473 * Return: 0 474 */ 475 static void grant_none_oplock(struct oplock_info *opinfo_new, 476 struct lease_ctx_info *lctx) 477 { 478 struct lease *lease = opinfo_new->o_lease; 479 480 opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE; 481 482 if (lctx) { 483 lease->state = 0; 484 memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE); 485 } 486 } 487 488 static inline int compare_guid_key(struct oplock_info *opinfo, 489 const char *guid1, const char *key1) 490 { 491 const char *guid2, *key2; 492 493 guid2 = opinfo->conn->ClientGUID; 494 key2 = opinfo->o_lease->lease_key; 495 if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) && 496 !memcmp(key1, key2, SMB2_LEASE_KEY_SIZE)) 497 return 1; 498 499 return 0; 500 } 501 502 /** 503 * same_client_has_lease() - check whether current lease request is 504 * from lease owner of file 505 * @ci: master file pointer 506 * @client_guid: Client GUID 507 * @lctx: lease context information 508 * 509 * Return: oplock(lease) object on success, otherwise NULL 510 */ 511 static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci, 512 char *client_guid, 513 struct lease_ctx_info *lctx) 514 { 515 int ret; 516 struct lease *lease; 517 struct oplock_info *opinfo; 518 struct oplock_info *m_opinfo = NULL; 519 520 if (!lctx) 521 return NULL; 522 523 /* 524 * Compare lease key and client_guid to know request from same owner 525 * of same client 526 */ 527 read_lock(&ci->m_lock); 528 list_for_each_entry(opinfo, &ci->m_op_list, op_entry) { 529 if (!opinfo->is_lease) 530 continue; 531 read_unlock(&ci->m_lock); 532 lease = opinfo->o_lease; 533 534 ret = compare_guid_key(opinfo, client_guid, lctx->lease_key); 535 if (ret) { 536 m_opinfo = opinfo; 537 /* skip upgrading lease about breaking lease */ 538 if (atomic_read(&opinfo->breaking_cnt)) { 539 read_lock(&ci->m_lock); 540 continue; 541 } 542 543 /* upgrading lease */ 544 if ((atomic_read(&ci->op_count) + 545 atomic_read(&ci->sop_count)) == 1) { 546 if (lease->state == 547 (lctx->req_state & lease->state)) { 548 lease->state |= lctx->req_state; 549 if (lctx->req_state & 550 SMB2_LEASE_WRITE_CACHING_LE) 551 lease_read_to_write(opinfo); 552 } 553 } else if ((atomic_read(&ci->op_count) + 554 atomic_read(&ci->sop_count)) > 1) { 555 if (lctx->req_state == 556 (SMB2_LEASE_READ_CACHING_LE | 557 SMB2_LEASE_HANDLE_CACHING_LE)) 558 lease->state = lctx->req_state; 559 } 560 561 if (lctx->req_state && lease->state == 562 SMB2_LEASE_NONE_LE) 563 lease_none_upgrade(opinfo, lctx->req_state); 564 } 565 read_lock(&ci->m_lock); 566 } 567 read_unlock(&ci->m_lock); 568 569 return m_opinfo; 570 } 571 572 static void wait_for_break_ack(struct oplock_info *opinfo) 573 { 574 int rc = 0; 575 576 rc = wait_event_interruptible_timeout(opinfo->oplock_q, 577 opinfo->op_state == OPLOCK_STATE_NONE || 578 opinfo->op_state == OPLOCK_CLOSING, 579 OPLOCK_WAIT_TIME); 580 581 /* is this a timeout ? */ 582 if (!rc) { 583 if (opinfo->is_lease) 584 opinfo->o_lease->state = SMB2_LEASE_NONE_LE; 585 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 586 opinfo->op_state = OPLOCK_STATE_NONE; 587 } 588 } 589 590 static void wake_up_oplock_break(struct oplock_info *opinfo) 591 { 592 clear_bit_unlock(0, &opinfo->pending_break); 593 /* memory barrier is needed for wake_up_bit() */ 594 smp_mb__after_atomic(); 595 wake_up_bit(&opinfo->pending_break, 0); 596 } 597 598 static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level) 599 { 600 while (test_and_set_bit(0, &opinfo->pending_break)) { 601 wait_on_bit(&opinfo->pending_break, 0, TASK_UNINTERRUPTIBLE); 602 603 /* Not immediately break to none. */ 604 opinfo->open_trunc = 0; 605 606 if (opinfo->op_state == OPLOCK_CLOSING) 607 return -ENOENT; 608 else if (!opinfo->is_lease && opinfo->level <= req_op_level) 609 return 1; 610 } 611 612 if (!opinfo->is_lease && opinfo->level <= req_op_level) { 613 wake_up_oplock_break(opinfo); 614 return 1; 615 } 616 return 0; 617 } 618 619 /** 620 * __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn 621 * to client 622 * @wk: smb work object 623 * 624 * There are two ways this function can be called. 1- while file open we break 625 * from exclusive/batch lock to levelII oplock and 2- while file write/truncate 626 * we break from levelII oplock no oplock. 627 * work->request_buf contains oplock_info. 628 */ 629 static void __smb2_oplock_break_noti(struct work_struct *wk) 630 { 631 struct smb2_oplock_break *rsp = NULL; 632 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); 633 struct oplock_break_info *br_info = work->request_buf; 634 struct smb2_hdr *rsp_hdr; 635 struct ksmbd_file *fp; 636 637 fp = ksmbd_lookup_durable_fd(br_info->fid); 638 if (!fp) 639 goto out; 640 641 if (allocate_interim_rsp_buf(work)) { 642 pr_err("smb2_allocate_rsp_buf failed! "); 643 ksmbd_fd_put(work, fp); 644 goto out; 645 } 646 647 rsp_hdr = smb2_get_msg(work->response_buf); 648 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2); 649 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER; 650 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE; 651 rsp_hdr->CreditRequest = cpu_to_le16(0); 652 rsp_hdr->Command = SMB2_OPLOCK_BREAK; 653 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR); 654 rsp_hdr->NextCommand = 0; 655 rsp_hdr->MessageId = cpu_to_le64(-1); 656 rsp_hdr->Id.SyncId.ProcessId = 0; 657 rsp_hdr->Id.SyncId.TreeId = 0; 658 rsp_hdr->SessionId = 0; 659 memset(rsp_hdr->Signature, 0, 16); 660 661 rsp = smb2_get_msg(work->response_buf); 662 663 rsp->StructureSize = cpu_to_le16(24); 664 if (!br_info->open_trunc && 665 (br_info->level == SMB2_OPLOCK_LEVEL_BATCH || 666 br_info->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) 667 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_II; 668 else 669 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE; 670 rsp->Reserved = 0; 671 rsp->Reserved2 = 0; 672 rsp->PersistentFid = fp->persistent_id; 673 rsp->VolatileFid = fp->volatile_id; 674 675 ksmbd_fd_put(work, fp); 676 if (ksmbd_iov_pin_rsp(work, (void *)rsp, 677 sizeof(struct smb2_oplock_break))) 678 goto out; 679 680 ksmbd_debug(OPLOCK, 681 "sending oplock break v_id %llu p_id = %llu lock level = %d\n", 682 rsp->VolatileFid, rsp->PersistentFid, rsp->OplockLevel); 683 684 ksmbd_conn_write(work); 685 686 out: 687 ksmbd_free_work_struct(work); 688 } 689 690 /** 691 * smb2_oplock_break_noti() - send smb2 exclusive/batch to level2 oplock 692 * break command from server to client 693 * @opinfo: oplock info object 694 * 695 * Return: 0 on success, otherwise error 696 */ 697 static int smb2_oplock_break_noti(struct oplock_info *opinfo) 698 { 699 struct ksmbd_conn *conn = opinfo->conn; 700 struct oplock_break_info *br_info; 701 int ret = 0; 702 struct ksmbd_work *work = ksmbd_alloc_work_struct(); 703 704 if (!work) 705 return -ENOMEM; 706 707 br_info = kmalloc(sizeof(struct oplock_break_info), GFP_KERNEL); 708 if (!br_info) { 709 ksmbd_free_work_struct(work); 710 return -ENOMEM; 711 } 712 713 br_info->level = opinfo->level; 714 br_info->fid = opinfo->fid; 715 br_info->open_trunc = opinfo->open_trunc; 716 717 work->request_buf = (char *)br_info; 718 work->conn = conn; 719 work->sess = opinfo->sess; 720 721 if (opinfo->op_state == OPLOCK_ACK_WAIT) { 722 INIT_WORK(&work->work, __smb2_oplock_break_noti); 723 ksmbd_queue_work(work); 724 725 wait_for_break_ack(opinfo); 726 } else { 727 __smb2_oplock_break_noti(&work->work); 728 if (opinfo->level == SMB2_OPLOCK_LEVEL_II) 729 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 730 } 731 return ret; 732 } 733 734 /** 735 * __smb2_lease_break_noti() - send lease break command from server 736 * to client 737 * @wk: smb work object 738 */ 739 static void __smb2_lease_break_noti(struct work_struct *wk) 740 { 741 struct smb2_lease_break *rsp = NULL; 742 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); 743 struct lease_break_info *br_info = work->request_buf; 744 struct smb2_hdr *rsp_hdr; 745 746 if (allocate_interim_rsp_buf(work)) { 747 ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! "); 748 goto out; 749 } 750 751 rsp_hdr = smb2_get_msg(work->response_buf); 752 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2); 753 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER; 754 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE; 755 rsp_hdr->CreditRequest = cpu_to_le16(0); 756 rsp_hdr->Command = SMB2_OPLOCK_BREAK; 757 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR); 758 rsp_hdr->NextCommand = 0; 759 rsp_hdr->MessageId = cpu_to_le64(-1); 760 rsp_hdr->Id.SyncId.ProcessId = 0; 761 rsp_hdr->Id.SyncId.TreeId = 0; 762 rsp_hdr->SessionId = 0; 763 memset(rsp_hdr->Signature, 0, 16); 764 765 rsp = smb2_get_msg(work->response_buf); 766 rsp->StructureSize = cpu_to_le16(44); 767 rsp->Epoch = br_info->epoch; 768 rsp->Flags = 0; 769 770 if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING_LE | 771 SMB2_LEASE_HANDLE_CACHING_LE)) 772 rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED; 773 774 memcpy(rsp->LeaseKey, br_info->lease_key, SMB2_LEASE_KEY_SIZE); 775 rsp->CurrentLeaseState = br_info->curr_state; 776 rsp->NewLeaseState = br_info->new_state; 777 rsp->BreakReason = 0; 778 rsp->AccessMaskHint = 0; 779 rsp->ShareMaskHint = 0; 780 781 if (ksmbd_iov_pin_rsp(work, (void *)rsp, 782 sizeof(struct smb2_lease_break))) 783 goto out; 784 785 ksmbd_conn_write(work); 786 787 out: 788 ksmbd_free_work_struct(work); 789 } 790 791 /** 792 * smb2_lease_break_noti() - break lease when a new client request 793 * write lease 794 * @opinfo: conains lease state information 795 * 796 * Return: 0 on success, otherwise error 797 */ 798 static int smb2_lease_break_noti(struct oplock_info *opinfo) 799 { 800 struct ksmbd_conn *conn = opinfo->conn; 801 struct list_head *tmp, *t; 802 struct ksmbd_work *work; 803 struct lease_break_info *br_info; 804 struct lease *lease = opinfo->o_lease; 805 806 work = ksmbd_alloc_work_struct(); 807 if (!work) 808 return -ENOMEM; 809 810 br_info = kmalloc(sizeof(struct lease_break_info), GFP_KERNEL); 811 if (!br_info) { 812 ksmbd_free_work_struct(work); 813 return -ENOMEM; 814 } 815 816 br_info->curr_state = lease->state; 817 br_info->new_state = lease->new_state; 818 if (lease->version == 2) 819 br_info->epoch = cpu_to_le16(++lease->epoch); 820 else 821 br_info->epoch = 0; 822 memcpy(br_info->lease_key, lease->lease_key, SMB2_LEASE_KEY_SIZE); 823 824 work->request_buf = (char *)br_info; 825 work->conn = conn; 826 work->sess = opinfo->sess; 827 828 if (opinfo->op_state == OPLOCK_ACK_WAIT) { 829 list_for_each_safe(tmp, t, &opinfo->interim_list) { 830 struct ksmbd_work *in_work; 831 832 in_work = list_entry(tmp, struct ksmbd_work, 833 interim_entry); 834 setup_async_work(in_work, NULL, NULL); 835 smb2_send_interim_resp(in_work, STATUS_PENDING); 836 list_del_init(&in_work->interim_entry); 837 release_async_work(in_work); 838 } 839 INIT_WORK(&work->work, __smb2_lease_break_noti); 840 ksmbd_queue_work(work); 841 wait_for_break_ack(opinfo); 842 } else { 843 __smb2_lease_break_noti(&work->work); 844 if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) { 845 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 846 opinfo->o_lease->state = SMB2_LEASE_NONE_LE; 847 } 848 } 849 return 0; 850 } 851 852 static void wait_lease_breaking(struct oplock_info *opinfo) 853 { 854 if (!opinfo->is_lease) 855 return; 856 857 wake_up_interruptible_all(&opinfo->oplock_brk); 858 if (atomic_read(&opinfo->breaking_cnt)) { 859 int ret = 0; 860 861 ret = wait_event_interruptible_timeout(opinfo->oplock_brk, 862 atomic_read(&opinfo->breaking_cnt) == 0, 863 HZ); 864 if (!ret) 865 atomic_set(&opinfo->breaking_cnt, 0); 866 } 867 } 868 869 static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level) 870 { 871 int err = 0; 872 873 /* Need to break exclusive/batch oplock, write lease or overwrite_if */ 874 ksmbd_debug(OPLOCK, 875 "request to send oplock(level : 0x%x) break notification\n", 876 brk_opinfo->level); 877 878 if (brk_opinfo->is_lease) { 879 struct lease *lease = brk_opinfo->o_lease; 880 881 atomic_inc(&brk_opinfo->breaking_cnt); 882 883 err = oplock_break_pending(brk_opinfo, req_op_level); 884 if (err) 885 return err < 0 ? err : 0; 886 887 if (brk_opinfo->open_trunc) { 888 /* 889 * Create overwrite break trigger the lease break to 890 * none. 891 */ 892 lease->new_state = SMB2_LEASE_NONE_LE; 893 } else { 894 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) { 895 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 896 lease->new_state = 897 SMB2_LEASE_READ_CACHING_LE | 898 SMB2_LEASE_HANDLE_CACHING_LE; 899 else 900 lease->new_state = 901 SMB2_LEASE_READ_CACHING_LE; 902 } else { 903 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 904 lease->new_state = 905 SMB2_LEASE_READ_CACHING_LE; 906 else 907 lease->new_state = SMB2_LEASE_NONE_LE; 908 } 909 } 910 911 if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE | 912 SMB2_LEASE_HANDLE_CACHING_LE)) 913 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 914 else 915 atomic_dec(&brk_opinfo->breaking_cnt); 916 } else { 917 err = oplock_break_pending(brk_opinfo, req_op_level); 918 if (err) 919 return err < 0 ? err : 0; 920 921 if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH || 922 brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) 923 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 924 } 925 926 if (brk_opinfo->is_lease) 927 err = smb2_lease_break_noti(brk_opinfo); 928 else 929 err = smb2_oplock_break_noti(brk_opinfo); 930 931 ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level); 932 if (brk_opinfo->op_state == OPLOCK_CLOSING) 933 err = -ENOENT; 934 wake_up_oplock_break(brk_opinfo); 935 936 wait_lease_breaking(brk_opinfo); 937 938 return err; 939 } 940 941 void destroy_lease_table(struct ksmbd_conn *conn) 942 { 943 struct lease_table *lb, *lbtmp; 944 struct oplock_info *opinfo; 945 946 write_lock(&lease_list_lock); 947 if (list_empty(&lease_table_list)) { 948 write_unlock(&lease_list_lock); 949 return; 950 } 951 952 list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) { 953 if (conn && memcmp(lb->client_guid, conn->ClientGUID, 954 SMB2_CLIENT_GUID_SIZE)) 955 continue; 956 again: 957 rcu_read_lock(); 958 list_for_each_entry_rcu(opinfo, &lb->lease_list, 959 lease_entry) { 960 rcu_read_unlock(); 961 lease_del_list(opinfo); 962 goto again; 963 } 964 rcu_read_unlock(); 965 list_del(&lb->l_entry); 966 kfree(lb); 967 } 968 write_unlock(&lease_list_lock); 969 } 970 971 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci, 972 struct lease_ctx_info *lctx) 973 { 974 struct oplock_info *opinfo; 975 int err = 0; 976 struct lease_table *lb; 977 978 if (!lctx) 979 return err; 980 981 read_lock(&lease_list_lock); 982 if (list_empty(&lease_table_list)) { 983 read_unlock(&lease_list_lock); 984 return 0; 985 } 986 987 list_for_each_entry(lb, &lease_table_list, l_entry) { 988 if (!memcmp(lb->client_guid, sess->ClientGUID, 989 SMB2_CLIENT_GUID_SIZE)) 990 goto found; 991 } 992 read_unlock(&lease_list_lock); 993 994 return 0; 995 996 found: 997 rcu_read_lock(); 998 list_for_each_entry_rcu(opinfo, &lb->lease_list, lease_entry) { 999 if (!atomic_inc_not_zero(&opinfo->refcount)) 1000 continue; 1001 rcu_read_unlock(); 1002 if (opinfo->o_fp->f_ci == ci) 1003 goto op_next; 1004 err = compare_guid_key(opinfo, sess->ClientGUID, 1005 lctx->lease_key); 1006 if (err) { 1007 err = -EINVAL; 1008 ksmbd_debug(OPLOCK, 1009 "found same lease key is already used in other files\n"); 1010 opinfo_put(opinfo); 1011 goto out; 1012 } 1013 op_next: 1014 opinfo_put(opinfo); 1015 rcu_read_lock(); 1016 } 1017 rcu_read_unlock(); 1018 1019 out: 1020 read_unlock(&lease_list_lock); 1021 return err; 1022 } 1023 1024 static void copy_lease(struct oplock_info *op1, struct oplock_info *op2) 1025 { 1026 struct lease *lease1 = op1->o_lease; 1027 struct lease *lease2 = op2->o_lease; 1028 1029 op2->level = op1->level; 1030 lease2->state = lease1->state; 1031 memcpy(lease2->lease_key, lease1->lease_key, 1032 SMB2_LEASE_KEY_SIZE); 1033 lease2->duration = lease1->duration; 1034 lease2->flags = lease1->flags; 1035 } 1036 1037 static int add_lease_global_list(struct oplock_info *opinfo) 1038 { 1039 struct lease_table *lb; 1040 1041 read_lock(&lease_list_lock); 1042 list_for_each_entry(lb, &lease_table_list, l_entry) { 1043 if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID, 1044 SMB2_CLIENT_GUID_SIZE)) { 1045 opinfo->o_lease->l_lb = lb; 1046 lease_add_list(opinfo); 1047 read_unlock(&lease_list_lock); 1048 return 0; 1049 } 1050 } 1051 read_unlock(&lease_list_lock); 1052 1053 lb = kmalloc(sizeof(struct lease_table), GFP_KERNEL); 1054 if (!lb) 1055 return -ENOMEM; 1056 1057 memcpy(lb->client_guid, opinfo->conn->ClientGUID, 1058 SMB2_CLIENT_GUID_SIZE); 1059 INIT_LIST_HEAD(&lb->lease_list); 1060 spin_lock_init(&lb->lb_lock); 1061 opinfo->o_lease->l_lb = lb; 1062 lease_add_list(opinfo); 1063 lb_add(lb); 1064 return 0; 1065 } 1066 1067 static void set_oplock_level(struct oplock_info *opinfo, int level, 1068 struct lease_ctx_info *lctx) 1069 { 1070 switch (level) { 1071 case SMB2_OPLOCK_LEVEL_BATCH: 1072 case SMB2_OPLOCK_LEVEL_EXCLUSIVE: 1073 grant_write_oplock(opinfo, level, lctx); 1074 break; 1075 case SMB2_OPLOCK_LEVEL_II: 1076 grant_read_oplock(opinfo, lctx); 1077 break; 1078 default: 1079 grant_none_oplock(opinfo, lctx); 1080 break; 1081 } 1082 } 1083 1084 /** 1085 * smb_grant_oplock() - handle oplock/lease request on file open 1086 * @work: smb work 1087 * @req_op_level: oplock level 1088 * @pid: id of open file 1089 * @fp: ksmbd file pointer 1090 * @tid: Tree id of connection 1091 * @lctx: lease context information on file open 1092 * @share_ret: share mode 1093 * 1094 * Return: 0 on success, otherwise error 1095 */ 1096 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid, 1097 struct ksmbd_file *fp, __u16 tid, 1098 struct lease_ctx_info *lctx, int share_ret) 1099 { 1100 struct ksmbd_session *sess = work->sess; 1101 int err = 0; 1102 struct oplock_info *opinfo = NULL, *prev_opinfo = NULL; 1103 struct ksmbd_inode *ci = fp->f_ci; 1104 bool prev_op_has_lease; 1105 __le32 prev_op_state = 0; 1106 1107 /* not support directory lease */ 1108 if (S_ISDIR(file_inode(fp->filp)->i_mode)) 1109 return 0; 1110 1111 opinfo = alloc_opinfo(work, pid, tid); 1112 if (!opinfo) 1113 return -ENOMEM; 1114 1115 if (lctx) { 1116 err = alloc_lease(opinfo, lctx); 1117 if (err) 1118 goto err_out; 1119 opinfo->is_lease = 1; 1120 } 1121 1122 /* ci does not have any oplock */ 1123 if (!opinfo_count(fp)) 1124 goto set_lev; 1125 1126 /* grant none-oplock if second open is trunc */ 1127 if (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE && 1128 fp->cdoption != FILE_OVERWRITE_LE && 1129 fp->cdoption != FILE_SUPERSEDE_LE) { 1130 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1131 goto set_lev; 1132 } 1133 1134 if (lctx) { 1135 struct oplock_info *m_opinfo; 1136 1137 /* is lease already granted ? */ 1138 m_opinfo = same_client_has_lease(ci, sess->ClientGUID, 1139 lctx); 1140 if (m_opinfo) { 1141 copy_lease(m_opinfo, opinfo); 1142 if (atomic_read(&m_opinfo->breaking_cnt)) 1143 opinfo->o_lease->flags = 1144 SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE; 1145 goto out; 1146 } 1147 } 1148 prev_opinfo = opinfo_get_list(ci); 1149 if (!prev_opinfo || 1150 (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) { 1151 opinfo_conn_put(prev_opinfo); 1152 goto set_lev; 1153 } 1154 prev_op_has_lease = prev_opinfo->is_lease; 1155 if (prev_op_has_lease) 1156 prev_op_state = prev_opinfo->o_lease->state; 1157 1158 if (share_ret < 0 && 1159 prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1160 err = share_ret; 1161 opinfo_conn_put(prev_opinfo); 1162 goto err_out; 1163 } 1164 1165 if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1166 prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1167 opinfo_conn_put(prev_opinfo); 1168 goto op_break_not_needed; 1169 } 1170 1171 list_add(&work->interim_entry, &prev_opinfo->interim_list); 1172 err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II); 1173 opinfo_conn_put(prev_opinfo); 1174 if (err == -ENOENT) 1175 goto set_lev; 1176 /* Check all oplock was freed by close */ 1177 else if (err < 0) 1178 goto err_out; 1179 1180 op_break_not_needed: 1181 if (share_ret < 0) { 1182 err = share_ret; 1183 goto err_out; 1184 } 1185 1186 if (req_op_level != SMB2_OPLOCK_LEVEL_NONE) 1187 req_op_level = SMB2_OPLOCK_LEVEL_II; 1188 1189 /* grant fixed oplock on stacked locking between lease and oplock */ 1190 if (prev_op_has_lease && !lctx) 1191 if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE) 1192 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1193 1194 if (!prev_op_has_lease && lctx) { 1195 req_op_level = SMB2_OPLOCK_LEVEL_II; 1196 lctx->req_state = SMB2_LEASE_READ_CACHING_LE; 1197 } 1198 1199 set_lev: 1200 set_oplock_level(opinfo, req_op_level, lctx); 1201 1202 out: 1203 rcu_assign_pointer(fp->f_opinfo, opinfo); 1204 opinfo->o_fp = fp; 1205 1206 opinfo_count_inc(fp); 1207 opinfo_add(opinfo); 1208 if (opinfo->is_lease) { 1209 err = add_lease_global_list(opinfo); 1210 if (err) 1211 goto err_out; 1212 } 1213 1214 return 0; 1215 err_out: 1216 free_opinfo(opinfo); 1217 return err; 1218 } 1219 1220 /** 1221 * smb_break_all_write_oplock() - break batch/exclusive oplock to level2 1222 * @work: smb work 1223 * @fp: ksmbd file pointer 1224 * @is_trunc: truncate on open 1225 */ 1226 static void smb_break_all_write_oplock(struct ksmbd_work *work, 1227 struct ksmbd_file *fp, int is_trunc) 1228 { 1229 struct oplock_info *brk_opinfo; 1230 1231 brk_opinfo = opinfo_get_list(fp->f_ci); 1232 if (!brk_opinfo) 1233 return; 1234 if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1235 brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1236 opinfo_conn_put(brk_opinfo); 1237 return; 1238 } 1239 1240 brk_opinfo->open_trunc = is_trunc; 1241 list_add(&work->interim_entry, &brk_opinfo->interim_list); 1242 oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II); 1243 opinfo_conn_put(brk_opinfo); 1244 } 1245 1246 /** 1247 * smb_break_all_levII_oplock() - send level2 oplock or read lease break command 1248 * from server to client 1249 * @work: smb work 1250 * @fp: ksmbd file pointer 1251 * @is_trunc: truncate on open 1252 */ 1253 void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp, 1254 int is_trunc) 1255 { 1256 struct oplock_info *op, *brk_op; 1257 struct ksmbd_inode *ci; 1258 struct ksmbd_conn *conn = work->conn; 1259 1260 if (!test_share_config_flag(work->tcon->share_conf, 1261 KSMBD_SHARE_FLAG_OPLOCKS)) 1262 return; 1263 1264 ci = fp->f_ci; 1265 op = opinfo_get(fp); 1266 1267 rcu_read_lock(); 1268 list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) { 1269 if (!atomic_inc_not_zero(&brk_op->refcount)) 1270 continue; 1271 1272 atomic_inc(&brk_op->conn->r_count); 1273 if (ksmbd_conn_releasing(brk_op->conn)) { 1274 atomic_dec(&brk_op->conn->r_count); 1275 continue; 1276 } 1277 1278 rcu_read_unlock(); 1279 if (brk_op->is_lease && (brk_op->o_lease->state & 1280 (~(SMB2_LEASE_READ_CACHING_LE | 1281 SMB2_LEASE_HANDLE_CACHING_LE)))) { 1282 ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n", 1283 brk_op->o_lease->state); 1284 goto next; 1285 } else if (brk_op->level != 1286 SMB2_OPLOCK_LEVEL_II) { 1287 ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n", 1288 brk_op->level); 1289 goto next; 1290 } 1291 1292 /* Skip oplock being break to none */ 1293 if (brk_op->is_lease && 1294 brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE && 1295 atomic_read(&brk_op->breaking_cnt)) 1296 goto next; 1297 1298 if (op && op->is_lease && brk_op->is_lease && 1299 !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID, 1300 SMB2_CLIENT_GUID_SIZE) && 1301 !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key, 1302 SMB2_LEASE_KEY_SIZE)) 1303 goto next; 1304 brk_op->open_trunc = is_trunc; 1305 oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE); 1306 next: 1307 opinfo_conn_put(brk_op); 1308 rcu_read_lock(); 1309 } 1310 rcu_read_unlock(); 1311 1312 if (op) 1313 opinfo_put(op); 1314 } 1315 1316 /** 1317 * smb_break_all_oplock() - break both batch/exclusive and level2 oplock 1318 * @work: smb work 1319 * @fp: ksmbd file pointer 1320 */ 1321 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp) 1322 { 1323 if (!test_share_config_flag(work->tcon->share_conf, 1324 KSMBD_SHARE_FLAG_OPLOCKS)) 1325 return; 1326 1327 smb_break_all_write_oplock(work, fp, 1); 1328 smb_break_all_levII_oplock(work, fp, 1); 1329 } 1330 1331 /** 1332 * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type 1333 * @lease_state: lease type 1334 * 1335 * Return: 0 if no mapping, otherwise corresponding oplock type 1336 */ 1337 __u8 smb2_map_lease_to_oplock(__le32 lease_state) 1338 { 1339 if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE | 1340 SMB2_LEASE_READ_CACHING_LE | 1341 SMB2_LEASE_WRITE_CACHING_LE)) { 1342 return SMB2_OPLOCK_LEVEL_BATCH; 1343 } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE && 1344 lease_state & SMB2_LEASE_WRITE_CACHING_LE) { 1345 if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE)) 1346 return SMB2_OPLOCK_LEVEL_EXCLUSIVE; 1347 } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) { 1348 return SMB2_OPLOCK_LEVEL_II; 1349 } 1350 return 0; 1351 } 1352 1353 /** 1354 * create_lease_buf() - create lease context for open cmd response 1355 * @rbuf: buffer to create lease context response 1356 * @lease: buffer to stored parsed lease state information 1357 */ 1358 void create_lease_buf(u8 *rbuf, struct lease *lease) 1359 { 1360 if (lease->version == 2) { 1361 struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf; 1362 1363 memset(buf, 0, sizeof(struct create_lease_v2)); 1364 memcpy(buf->lcontext.LeaseKey, lease->lease_key, 1365 SMB2_LEASE_KEY_SIZE); 1366 buf->lcontext.LeaseFlags = lease->flags; 1367 buf->lcontext.LeaseState = lease->state; 1368 memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key, 1369 SMB2_LEASE_KEY_SIZE); 1370 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1371 (struct create_lease_v2, lcontext)); 1372 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2)); 1373 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1374 (struct create_lease_v2, Name)); 1375 buf->ccontext.NameLength = cpu_to_le16(4); 1376 buf->Name[0] = 'R'; 1377 buf->Name[1] = 'q'; 1378 buf->Name[2] = 'L'; 1379 buf->Name[3] = 's'; 1380 } else { 1381 struct create_lease *buf = (struct create_lease *)rbuf; 1382 1383 memset(buf, 0, sizeof(struct create_lease)); 1384 memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE); 1385 buf->lcontext.LeaseFlags = lease->flags; 1386 buf->lcontext.LeaseState = lease->state; 1387 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1388 (struct create_lease, lcontext)); 1389 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context)); 1390 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1391 (struct create_lease, Name)); 1392 buf->ccontext.NameLength = cpu_to_le16(4); 1393 buf->Name[0] = 'R'; 1394 buf->Name[1] = 'q'; 1395 buf->Name[2] = 'L'; 1396 buf->Name[3] = 's'; 1397 } 1398 } 1399 1400 /** 1401 * parse_lease_state() - parse lease context containted in file open request 1402 * @open_req: buffer containing smb2 file open(create) request 1403 * 1404 * Return: oplock state, -ENOENT if create lease context not found 1405 */ 1406 struct lease_ctx_info *parse_lease_state(void *open_req) 1407 { 1408 struct create_context *cc; 1409 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1410 struct lease_ctx_info *lreq; 1411 1412 cc = smb2_find_context_vals(req, SMB2_CREATE_REQUEST_LEASE, 4); 1413 if (IS_ERR_OR_NULL(cc)) 1414 return NULL; 1415 1416 lreq = kzalloc(sizeof(struct lease_ctx_info), GFP_KERNEL); 1417 if (!lreq) 1418 return NULL; 1419 1420 if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) { 1421 struct create_lease_v2 *lc = (struct create_lease_v2 *)cc; 1422 1423 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); 1424 lreq->req_state = lc->lcontext.LeaseState; 1425 lreq->flags = lc->lcontext.LeaseFlags; 1426 lreq->duration = lc->lcontext.LeaseDuration; 1427 memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey, 1428 SMB2_LEASE_KEY_SIZE); 1429 lreq->version = 2; 1430 } else { 1431 struct create_lease *lc = (struct create_lease *)cc; 1432 1433 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); 1434 lreq->req_state = lc->lcontext.LeaseState; 1435 lreq->flags = lc->lcontext.LeaseFlags; 1436 lreq->duration = lc->lcontext.LeaseDuration; 1437 lreq->version = 1; 1438 } 1439 return lreq; 1440 } 1441 1442 /** 1443 * smb2_find_context_vals() - find a particular context info in open request 1444 * @open_req: buffer containing smb2 file open(create) request 1445 * @tag: context name to search for 1446 * @tag_len: the length of tag 1447 * 1448 * Return: pointer to requested context, NULL if @str context not found 1449 * or error pointer if name length is invalid. 1450 */ 1451 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len) 1452 { 1453 struct create_context *cc; 1454 unsigned int next = 0; 1455 char *name; 1456 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1457 unsigned int remain_len, name_off, name_len, value_off, value_len, 1458 cc_len; 1459 1460 /* 1461 * CreateContextsOffset and CreateContextsLength are guaranteed to 1462 * be valid because of ksmbd_smb2_check_message(). 1463 */ 1464 cc = (struct create_context *)((char *)req + 1465 le32_to_cpu(req->CreateContextsOffset)); 1466 remain_len = le32_to_cpu(req->CreateContextsLength); 1467 do { 1468 cc = (struct create_context *)((char *)cc + next); 1469 if (remain_len < offsetof(struct create_context, Buffer)) 1470 return ERR_PTR(-EINVAL); 1471 1472 next = le32_to_cpu(cc->Next); 1473 name_off = le16_to_cpu(cc->NameOffset); 1474 name_len = le16_to_cpu(cc->NameLength); 1475 value_off = le16_to_cpu(cc->DataOffset); 1476 value_len = le32_to_cpu(cc->DataLength); 1477 cc_len = next ? next : remain_len; 1478 1479 if ((next & 0x7) != 0 || 1480 next > remain_len || 1481 name_off != offsetof(struct create_context, Buffer) || 1482 name_len < 4 || 1483 name_off + name_len > cc_len || 1484 (value_off & 0x7) != 0 || 1485 (value_len && value_off < name_off + (name_len < 8 ? 8 : name_len)) || 1486 ((u64)value_off + value_len > cc_len)) 1487 return ERR_PTR(-EINVAL); 1488 1489 name = (char *)cc + name_off; 1490 if (name_len == tag_len && !memcmp(name, tag, name_len)) 1491 return cc; 1492 1493 remain_len -= next; 1494 } while (next != 0); 1495 1496 return NULL; 1497 } 1498 1499 /** 1500 * create_durable_rsp_buf() - create durable handle context 1501 * @cc: buffer to create durable context response 1502 */ 1503 void create_durable_rsp_buf(char *cc) 1504 { 1505 struct create_durable_rsp *buf; 1506 1507 buf = (struct create_durable_rsp *)cc; 1508 memset(buf, 0, sizeof(struct create_durable_rsp)); 1509 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1510 (struct create_durable_rsp, Data)); 1511 buf->ccontext.DataLength = cpu_to_le32(8); 1512 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1513 (struct create_durable_rsp, Name)); 1514 buf->ccontext.NameLength = cpu_to_le16(4); 1515 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */ 1516 buf->Name[0] = 'D'; 1517 buf->Name[1] = 'H'; 1518 buf->Name[2] = 'n'; 1519 buf->Name[3] = 'Q'; 1520 } 1521 1522 /** 1523 * create_durable_v2_rsp_buf() - create durable handle v2 context 1524 * @cc: buffer to create durable context response 1525 * @fp: ksmbd file pointer 1526 */ 1527 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp) 1528 { 1529 struct create_durable_v2_rsp *buf; 1530 1531 buf = (struct create_durable_v2_rsp *)cc; 1532 memset(buf, 0, sizeof(struct create_durable_rsp)); 1533 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1534 (struct create_durable_rsp, Data)); 1535 buf->ccontext.DataLength = cpu_to_le32(8); 1536 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1537 (struct create_durable_rsp, Name)); 1538 buf->ccontext.NameLength = cpu_to_le16(4); 1539 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */ 1540 buf->Name[0] = 'D'; 1541 buf->Name[1] = 'H'; 1542 buf->Name[2] = '2'; 1543 buf->Name[3] = 'Q'; 1544 1545 buf->Timeout = cpu_to_le32(fp->durable_timeout); 1546 } 1547 1548 /** 1549 * create_mxac_rsp_buf() - create query maximal access context 1550 * @cc: buffer to create maximal access context response 1551 * @maximal_access: maximal access 1552 */ 1553 void create_mxac_rsp_buf(char *cc, int maximal_access) 1554 { 1555 struct create_mxac_rsp *buf; 1556 1557 buf = (struct create_mxac_rsp *)cc; 1558 memset(buf, 0, sizeof(struct create_mxac_rsp)); 1559 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1560 (struct create_mxac_rsp, QueryStatus)); 1561 buf->ccontext.DataLength = cpu_to_le32(8); 1562 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1563 (struct create_mxac_rsp, Name)); 1564 buf->ccontext.NameLength = cpu_to_le16(4); 1565 /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */ 1566 buf->Name[0] = 'M'; 1567 buf->Name[1] = 'x'; 1568 buf->Name[2] = 'A'; 1569 buf->Name[3] = 'c'; 1570 1571 buf->QueryStatus = STATUS_SUCCESS; 1572 buf->MaximalAccess = cpu_to_le32(maximal_access); 1573 } 1574 1575 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id) 1576 { 1577 struct create_disk_id_rsp *buf; 1578 1579 buf = (struct create_disk_id_rsp *)cc; 1580 memset(buf, 0, sizeof(struct create_disk_id_rsp)); 1581 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1582 (struct create_disk_id_rsp, DiskFileId)); 1583 buf->ccontext.DataLength = cpu_to_le32(32); 1584 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1585 (struct create_mxac_rsp, Name)); 1586 buf->ccontext.NameLength = cpu_to_le16(4); 1587 /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */ 1588 buf->Name[0] = 'Q'; 1589 buf->Name[1] = 'F'; 1590 buf->Name[2] = 'i'; 1591 buf->Name[3] = 'd'; 1592 1593 buf->DiskFileId = cpu_to_le64(file_id); 1594 buf->VolumeId = cpu_to_le64(vol_id); 1595 } 1596 1597 /** 1598 * create_posix_rsp_buf() - create posix extension context 1599 * @cc: buffer to create posix on posix response 1600 * @fp: ksmbd file pointer 1601 */ 1602 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp) 1603 { 1604 struct create_posix_rsp *buf; 1605 struct inode *inode = file_inode(fp->filp); 1606 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 1607 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode); 1608 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode); 1609 1610 buf = (struct create_posix_rsp *)cc; 1611 memset(buf, 0, sizeof(struct create_posix_rsp)); 1612 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1613 (struct create_posix_rsp, nlink)); 1614 /* 1615 * DataLength = nlink(4) + reparse_tag(4) + mode(4) + 1616 * domain sid(28) + unix group sid(16). 1617 */ 1618 buf->ccontext.DataLength = cpu_to_le32(56); 1619 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1620 (struct create_posix_rsp, Name)); 1621 buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 1622 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 1623 buf->Name[0] = 0x93; 1624 buf->Name[1] = 0xAD; 1625 buf->Name[2] = 0x25; 1626 buf->Name[3] = 0x50; 1627 buf->Name[4] = 0x9C; 1628 buf->Name[5] = 0xB4; 1629 buf->Name[6] = 0x11; 1630 buf->Name[7] = 0xE7; 1631 buf->Name[8] = 0xB4; 1632 buf->Name[9] = 0x23; 1633 buf->Name[10] = 0x83; 1634 buf->Name[11] = 0xDE; 1635 buf->Name[12] = 0x96; 1636 buf->Name[13] = 0x8B; 1637 buf->Name[14] = 0xCD; 1638 buf->Name[15] = 0x7C; 1639 1640 buf->nlink = cpu_to_le32(inode->i_nlink); 1641 buf->reparse_tag = cpu_to_le32(fp->volatile_id); 1642 buf->mode = cpu_to_le32(inode->i_mode & 0777); 1643 /* 1644 * SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)). 1645 * Domain sid(28) = revision(1) + num_subauth(1) + authority(6) + 1646 * sub_auth(4 * 4(num_subauth)) + RID(4). 1647 * UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) + 1648 * sub_auth(4 * 1(num_subauth)) + RID(4). 1649 */ 1650 id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)), 1651 SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]); 1652 id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)), 1653 SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]); 1654 } 1655 1656 /* 1657 * Find lease object(opinfo) for given lease key/fid from lease 1658 * break/file close path. 1659 */ 1660 /** 1661 * lookup_lease_in_table() - find a matching lease info object 1662 * @conn: connection instance 1663 * @lease_key: lease key to be searched for 1664 * 1665 * Return: opinfo if found matching opinfo, otherwise NULL 1666 */ 1667 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn, 1668 char *lease_key) 1669 { 1670 struct oplock_info *opinfo = NULL, *ret_op = NULL; 1671 struct lease_table *lt; 1672 int ret; 1673 1674 read_lock(&lease_list_lock); 1675 list_for_each_entry(lt, &lease_table_list, l_entry) { 1676 if (!memcmp(lt->client_guid, conn->ClientGUID, 1677 SMB2_CLIENT_GUID_SIZE)) 1678 goto found; 1679 } 1680 1681 read_unlock(&lease_list_lock); 1682 return NULL; 1683 1684 found: 1685 rcu_read_lock(); 1686 list_for_each_entry_rcu(opinfo, <->lease_list, lease_entry) { 1687 if (!atomic_inc_not_zero(&opinfo->refcount)) 1688 continue; 1689 rcu_read_unlock(); 1690 if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING) 1691 goto op_next; 1692 if (!(opinfo->o_lease->state & 1693 (SMB2_LEASE_HANDLE_CACHING_LE | 1694 SMB2_LEASE_WRITE_CACHING_LE))) 1695 goto op_next; 1696 ret = compare_guid_key(opinfo, conn->ClientGUID, 1697 lease_key); 1698 if (ret) { 1699 ksmbd_debug(OPLOCK, "found opinfo\n"); 1700 ret_op = opinfo; 1701 goto out; 1702 } 1703 op_next: 1704 opinfo_put(opinfo); 1705 rcu_read_lock(); 1706 } 1707 rcu_read_unlock(); 1708 1709 out: 1710 read_unlock(&lease_list_lock); 1711 return ret_op; 1712 } 1713