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(&in_work->interim_entry); 837 } 838 INIT_WORK(&work->work, __smb2_lease_break_noti); 839 ksmbd_queue_work(work); 840 wait_for_break_ack(opinfo); 841 } else { 842 __smb2_lease_break_noti(&work->work); 843 if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) { 844 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 845 opinfo->o_lease->state = SMB2_LEASE_NONE_LE; 846 } 847 } 848 return 0; 849 } 850 851 static void wait_lease_breaking(struct oplock_info *opinfo) 852 { 853 if (!opinfo->is_lease) 854 return; 855 856 wake_up_interruptible_all(&opinfo->oplock_brk); 857 if (atomic_read(&opinfo->breaking_cnt)) { 858 int ret = 0; 859 860 ret = wait_event_interruptible_timeout(opinfo->oplock_brk, 861 atomic_read(&opinfo->breaking_cnt) == 0, 862 HZ); 863 if (!ret) 864 atomic_set(&opinfo->breaking_cnt, 0); 865 } 866 } 867 868 static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level) 869 { 870 int err = 0; 871 872 /* Need to break exclusive/batch oplock, write lease or overwrite_if */ 873 ksmbd_debug(OPLOCK, 874 "request to send oplock(level : 0x%x) break notification\n", 875 brk_opinfo->level); 876 877 if (brk_opinfo->is_lease) { 878 struct lease *lease = brk_opinfo->o_lease; 879 880 atomic_inc(&brk_opinfo->breaking_cnt); 881 882 err = oplock_break_pending(brk_opinfo, req_op_level); 883 if (err) 884 return err < 0 ? err : 0; 885 886 if (brk_opinfo->open_trunc) { 887 /* 888 * Create overwrite break trigger the lease break to 889 * none. 890 */ 891 lease->new_state = SMB2_LEASE_NONE_LE; 892 } else { 893 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) { 894 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 895 lease->new_state = 896 SMB2_LEASE_READ_CACHING_LE | 897 SMB2_LEASE_HANDLE_CACHING_LE; 898 else 899 lease->new_state = 900 SMB2_LEASE_READ_CACHING_LE; 901 } else { 902 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 903 lease->new_state = 904 SMB2_LEASE_READ_CACHING_LE; 905 else 906 lease->new_state = SMB2_LEASE_NONE_LE; 907 } 908 } 909 910 if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE | 911 SMB2_LEASE_HANDLE_CACHING_LE)) 912 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 913 else 914 atomic_dec(&brk_opinfo->breaking_cnt); 915 } else { 916 err = oplock_break_pending(brk_opinfo, req_op_level); 917 if (err) 918 return err < 0 ? err : 0; 919 920 if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH || 921 brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) 922 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 923 } 924 925 if (brk_opinfo->is_lease) 926 err = smb2_lease_break_noti(brk_opinfo); 927 else 928 err = smb2_oplock_break_noti(brk_opinfo); 929 930 ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level); 931 if (brk_opinfo->op_state == OPLOCK_CLOSING) 932 err = -ENOENT; 933 wake_up_oplock_break(brk_opinfo); 934 935 wait_lease_breaking(brk_opinfo); 936 937 return err; 938 } 939 940 void destroy_lease_table(struct ksmbd_conn *conn) 941 { 942 struct lease_table *lb, *lbtmp; 943 struct oplock_info *opinfo; 944 945 write_lock(&lease_list_lock); 946 if (list_empty(&lease_table_list)) { 947 write_unlock(&lease_list_lock); 948 return; 949 } 950 951 list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) { 952 if (conn && memcmp(lb->client_guid, conn->ClientGUID, 953 SMB2_CLIENT_GUID_SIZE)) 954 continue; 955 again: 956 rcu_read_lock(); 957 list_for_each_entry_rcu(opinfo, &lb->lease_list, 958 lease_entry) { 959 rcu_read_unlock(); 960 lease_del_list(opinfo); 961 goto again; 962 } 963 rcu_read_unlock(); 964 list_del(&lb->l_entry); 965 kfree(lb); 966 } 967 write_unlock(&lease_list_lock); 968 } 969 970 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci, 971 struct lease_ctx_info *lctx) 972 { 973 struct oplock_info *opinfo; 974 int err = 0; 975 struct lease_table *lb; 976 977 if (!lctx) 978 return err; 979 980 read_lock(&lease_list_lock); 981 if (list_empty(&lease_table_list)) { 982 read_unlock(&lease_list_lock); 983 return 0; 984 } 985 986 list_for_each_entry(lb, &lease_table_list, l_entry) { 987 if (!memcmp(lb->client_guid, sess->ClientGUID, 988 SMB2_CLIENT_GUID_SIZE)) 989 goto found; 990 } 991 read_unlock(&lease_list_lock); 992 993 return 0; 994 995 found: 996 rcu_read_lock(); 997 list_for_each_entry_rcu(opinfo, &lb->lease_list, lease_entry) { 998 if (!atomic_inc_not_zero(&opinfo->refcount)) 999 continue; 1000 rcu_read_unlock(); 1001 if (opinfo->o_fp->f_ci == ci) 1002 goto op_next; 1003 err = compare_guid_key(opinfo, sess->ClientGUID, 1004 lctx->lease_key); 1005 if (err) { 1006 err = -EINVAL; 1007 ksmbd_debug(OPLOCK, 1008 "found same lease key is already used in other files\n"); 1009 opinfo_put(opinfo); 1010 goto out; 1011 } 1012 op_next: 1013 opinfo_put(opinfo); 1014 rcu_read_lock(); 1015 } 1016 rcu_read_unlock(); 1017 1018 out: 1019 read_unlock(&lease_list_lock); 1020 return err; 1021 } 1022 1023 static void copy_lease(struct oplock_info *op1, struct oplock_info *op2) 1024 { 1025 struct lease *lease1 = op1->o_lease; 1026 struct lease *lease2 = op2->o_lease; 1027 1028 op2->level = op1->level; 1029 lease2->state = lease1->state; 1030 memcpy(lease2->lease_key, lease1->lease_key, 1031 SMB2_LEASE_KEY_SIZE); 1032 lease2->duration = lease1->duration; 1033 lease2->flags = lease1->flags; 1034 } 1035 1036 static int add_lease_global_list(struct oplock_info *opinfo) 1037 { 1038 struct lease_table *lb; 1039 1040 read_lock(&lease_list_lock); 1041 list_for_each_entry(lb, &lease_table_list, l_entry) { 1042 if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID, 1043 SMB2_CLIENT_GUID_SIZE)) { 1044 opinfo->o_lease->l_lb = lb; 1045 lease_add_list(opinfo); 1046 read_unlock(&lease_list_lock); 1047 return 0; 1048 } 1049 } 1050 read_unlock(&lease_list_lock); 1051 1052 lb = kmalloc(sizeof(struct lease_table), GFP_KERNEL); 1053 if (!lb) 1054 return -ENOMEM; 1055 1056 memcpy(lb->client_guid, opinfo->conn->ClientGUID, 1057 SMB2_CLIENT_GUID_SIZE); 1058 INIT_LIST_HEAD(&lb->lease_list); 1059 spin_lock_init(&lb->lb_lock); 1060 opinfo->o_lease->l_lb = lb; 1061 lease_add_list(opinfo); 1062 lb_add(lb); 1063 return 0; 1064 } 1065 1066 static void set_oplock_level(struct oplock_info *opinfo, int level, 1067 struct lease_ctx_info *lctx) 1068 { 1069 switch (level) { 1070 case SMB2_OPLOCK_LEVEL_BATCH: 1071 case SMB2_OPLOCK_LEVEL_EXCLUSIVE: 1072 grant_write_oplock(opinfo, level, lctx); 1073 break; 1074 case SMB2_OPLOCK_LEVEL_II: 1075 grant_read_oplock(opinfo, lctx); 1076 break; 1077 default: 1078 grant_none_oplock(opinfo, lctx); 1079 break; 1080 } 1081 } 1082 1083 /** 1084 * smb_grant_oplock() - handle oplock/lease request on file open 1085 * @work: smb work 1086 * @req_op_level: oplock level 1087 * @pid: id of open file 1088 * @fp: ksmbd file pointer 1089 * @tid: Tree id of connection 1090 * @lctx: lease context information on file open 1091 * @share_ret: share mode 1092 * 1093 * Return: 0 on success, otherwise error 1094 */ 1095 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid, 1096 struct ksmbd_file *fp, __u16 tid, 1097 struct lease_ctx_info *lctx, int share_ret) 1098 { 1099 struct ksmbd_session *sess = work->sess; 1100 int err = 0; 1101 struct oplock_info *opinfo = NULL, *prev_opinfo = NULL; 1102 struct ksmbd_inode *ci = fp->f_ci; 1103 bool prev_op_has_lease; 1104 __le32 prev_op_state = 0; 1105 1106 /* not support directory lease */ 1107 if (S_ISDIR(file_inode(fp->filp)->i_mode)) 1108 return 0; 1109 1110 opinfo = alloc_opinfo(work, pid, tid); 1111 if (!opinfo) 1112 return -ENOMEM; 1113 1114 if (lctx) { 1115 err = alloc_lease(opinfo, lctx); 1116 if (err) 1117 goto err_out; 1118 opinfo->is_lease = 1; 1119 } 1120 1121 /* ci does not have any oplock */ 1122 if (!opinfo_count(fp)) 1123 goto set_lev; 1124 1125 /* grant none-oplock if second open is trunc */ 1126 if (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE && 1127 fp->cdoption != FILE_OVERWRITE_LE && 1128 fp->cdoption != FILE_SUPERSEDE_LE) { 1129 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1130 goto set_lev; 1131 } 1132 1133 if (lctx) { 1134 struct oplock_info *m_opinfo; 1135 1136 /* is lease already granted ? */ 1137 m_opinfo = same_client_has_lease(ci, sess->ClientGUID, 1138 lctx); 1139 if (m_opinfo) { 1140 copy_lease(m_opinfo, opinfo); 1141 if (atomic_read(&m_opinfo->breaking_cnt)) 1142 opinfo->o_lease->flags = 1143 SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE; 1144 goto out; 1145 } 1146 } 1147 prev_opinfo = opinfo_get_list(ci); 1148 if (!prev_opinfo || 1149 (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) { 1150 opinfo_conn_put(prev_opinfo); 1151 goto set_lev; 1152 } 1153 prev_op_has_lease = prev_opinfo->is_lease; 1154 if (prev_op_has_lease) 1155 prev_op_state = prev_opinfo->o_lease->state; 1156 1157 if (share_ret < 0 && 1158 prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1159 err = share_ret; 1160 opinfo_conn_put(prev_opinfo); 1161 goto err_out; 1162 } 1163 1164 if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1165 prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1166 opinfo_conn_put(prev_opinfo); 1167 goto op_break_not_needed; 1168 } 1169 1170 list_add(&work->interim_entry, &prev_opinfo->interim_list); 1171 err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II); 1172 opinfo_conn_put(prev_opinfo); 1173 if (err == -ENOENT) 1174 goto set_lev; 1175 /* Check all oplock was freed by close */ 1176 else if (err < 0) 1177 goto err_out; 1178 1179 op_break_not_needed: 1180 if (share_ret < 0) { 1181 err = share_ret; 1182 goto err_out; 1183 } 1184 1185 if (req_op_level != SMB2_OPLOCK_LEVEL_NONE) 1186 req_op_level = SMB2_OPLOCK_LEVEL_II; 1187 1188 /* grant fixed oplock on stacked locking between lease and oplock */ 1189 if (prev_op_has_lease && !lctx) 1190 if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE) 1191 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1192 1193 if (!prev_op_has_lease && lctx) { 1194 req_op_level = SMB2_OPLOCK_LEVEL_II; 1195 lctx->req_state = SMB2_LEASE_READ_CACHING_LE; 1196 } 1197 1198 set_lev: 1199 set_oplock_level(opinfo, req_op_level, lctx); 1200 1201 out: 1202 rcu_assign_pointer(fp->f_opinfo, opinfo); 1203 opinfo->o_fp = fp; 1204 1205 opinfo_count_inc(fp); 1206 opinfo_add(opinfo); 1207 if (opinfo->is_lease) { 1208 err = add_lease_global_list(opinfo); 1209 if (err) 1210 goto err_out; 1211 } 1212 1213 return 0; 1214 err_out: 1215 free_opinfo(opinfo); 1216 return err; 1217 } 1218 1219 /** 1220 * smb_break_all_write_oplock() - break batch/exclusive oplock to level2 1221 * @work: smb work 1222 * @fp: ksmbd file pointer 1223 * @is_trunc: truncate on open 1224 */ 1225 static void smb_break_all_write_oplock(struct ksmbd_work *work, 1226 struct ksmbd_file *fp, int is_trunc) 1227 { 1228 struct oplock_info *brk_opinfo; 1229 1230 brk_opinfo = opinfo_get_list(fp->f_ci); 1231 if (!brk_opinfo) 1232 return; 1233 if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1234 brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1235 opinfo_conn_put(brk_opinfo); 1236 return; 1237 } 1238 1239 brk_opinfo->open_trunc = is_trunc; 1240 list_add(&work->interim_entry, &brk_opinfo->interim_list); 1241 oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II); 1242 opinfo_conn_put(brk_opinfo); 1243 } 1244 1245 /** 1246 * smb_break_all_levII_oplock() - send level2 oplock or read lease break command 1247 * from server to client 1248 * @work: smb work 1249 * @fp: ksmbd file pointer 1250 * @is_trunc: truncate on open 1251 */ 1252 void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp, 1253 int is_trunc) 1254 { 1255 struct oplock_info *op, *brk_op; 1256 struct ksmbd_inode *ci; 1257 struct ksmbd_conn *conn = work->conn; 1258 1259 if (!test_share_config_flag(work->tcon->share_conf, 1260 KSMBD_SHARE_FLAG_OPLOCKS)) 1261 return; 1262 1263 ci = fp->f_ci; 1264 op = opinfo_get(fp); 1265 1266 rcu_read_lock(); 1267 list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) { 1268 if (!atomic_inc_not_zero(&brk_op->refcount)) 1269 continue; 1270 1271 atomic_inc(&brk_op->conn->r_count); 1272 if (ksmbd_conn_releasing(brk_op->conn)) { 1273 atomic_dec(&brk_op->conn->r_count); 1274 continue; 1275 } 1276 1277 rcu_read_unlock(); 1278 if (brk_op->is_lease && (brk_op->o_lease->state & 1279 (~(SMB2_LEASE_READ_CACHING_LE | 1280 SMB2_LEASE_HANDLE_CACHING_LE)))) { 1281 ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n", 1282 brk_op->o_lease->state); 1283 goto next; 1284 } else if (brk_op->level != 1285 SMB2_OPLOCK_LEVEL_II) { 1286 ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n", 1287 brk_op->level); 1288 goto next; 1289 } 1290 1291 /* Skip oplock being break to none */ 1292 if (brk_op->is_lease && 1293 brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE && 1294 atomic_read(&brk_op->breaking_cnt)) 1295 goto next; 1296 1297 if (op && op->is_lease && brk_op->is_lease && 1298 !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID, 1299 SMB2_CLIENT_GUID_SIZE) && 1300 !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key, 1301 SMB2_LEASE_KEY_SIZE)) 1302 goto next; 1303 brk_op->open_trunc = is_trunc; 1304 oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE); 1305 next: 1306 opinfo_conn_put(brk_op); 1307 rcu_read_lock(); 1308 } 1309 rcu_read_unlock(); 1310 1311 if (op) 1312 opinfo_put(op); 1313 } 1314 1315 /** 1316 * smb_break_all_oplock() - break both batch/exclusive and level2 oplock 1317 * @work: smb work 1318 * @fp: ksmbd file pointer 1319 */ 1320 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp) 1321 { 1322 if (!test_share_config_flag(work->tcon->share_conf, 1323 KSMBD_SHARE_FLAG_OPLOCKS)) 1324 return; 1325 1326 smb_break_all_write_oplock(work, fp, 1); 1327 smb_break_all_levII_oplock(work, fp, 1); 1328 } 1329 1330 /** 1331 * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type 1332 * @lease_state: lease type 1333 * 1334 * Return: 0 if no mapping, otherwise corresponding oplock type 1335 */ 1336 __u8 smb2_map_lease_to_oplock(__le32 lease_state) 1337 { 1338 if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE | 1339 SMB2_LEASE_READ_CACHING_LE | 1340 SMB2_LEASE_WRITE_CACHING_LE)) { 1341 return SMB2_OPLOCK_LEVEL_BATCH; 1342 } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE && 1343 lease_state & SMB2_LEASE_WRITE_CACHING_LE) { 1344 if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE)) 1345 return SMB2_OPLOCK_LEVEL_EXCLUSIVE; 1346 } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) { 1347 return SMB2_OPLOCK_LEVEL_II; 1348 } 1349 return 0; 1350 } 1351 1352 /** 1353 * create_lease_buf() - create lease context for open cmd response 1354 * @rbuf: buffer to create lease context response 1355 * @lease: buffer to stored parsed lease state information 1356 */ 1357 void create_lease_buf(u8 *rbuf, struct lease *lease) 1358 { 1359 if (lease->version == 2) { 1360 struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf; 1361 1362 memset(buf, 0, sizeof(struct create_lease_v2)); 1363 memcpy(buf->lcontext.LeaseKey, lease->lease_key, 1364 SMB2_LEASE_KEY_SIZE); 1365 buf->lcontext.LeaseFlags = lease->flags; 1366 buf->lcontext.LeaseState = lease->state; 1367 memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key, 1368 SMB2_LEASE_KEY_SIZE); 1369 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1370 (struct create_lease_v2, lcontext)); 1371 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2)); 1372 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1373 (struct create_lease_v2, Name)); 1374 buf->ccontext.NameLength = cpu_to_le16(4); 1375 buf->Name[0] = 'R'; 1376 buf->Name[1] = 'q'; 1377 buf->Name[2] = 'L'; 1378 buf->Name[3] = 's'; 1379 } else { 1380 struct create_lease *buf = (struct create_lease *)rbuf; 1381 1382 memset(buf, 0, sizeof(struct create_lease)); 1383 memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE); 1384 buf->lcontext.LeaseFlags = lease->flags; 1385 buf->lcontext.LeaseState = lease->state; 1386 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1387 (struct create_lease, lcontext)); 1388 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context)); 1389 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1390 (struct create_lease, Name)); 1391 buf->ccontext.NameLength = cpu_to_le16(4); 1392 buf->Name[0] = 'R'; 1393 buf->Name[1] = 'q'; 1394 buf->Name[2] = 'L'; 1395 buf->Name[3] = 's'; 1396 } 1397 } 1398 1399 /** 1400 * parse_lease_state() - parse lease context containted in file open request 1401 * @open_req: buffer containing smb2 file open(create) request 1402 * 1403 * Return: oplock state, -ENOENT if create lease context not found 1404 */ 1405 struct lease_ctx_info *parse_lease_state(void *open_req) 1406 { 1407 struct create_context *cc; 1408 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1409 struct lease_ctx_info *lreq; 1410 1411 cc = smb2_find_context_vals(req, SMB2_CREATE_REQUEST_LEASE, 4); 1412 if (IS_ERR_OR_NULL(cc)) 1413 return NULL; 1414 1415 lreq = kzalloc(sizeof(struct lease_ctx_info), GFP_KERNEL); 1416 if (!lreq) 1417 return NULL; 1418 1419 if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) { 1420 struct create_lease_v2 *lc = (struct create_lease_v2 *)cc; 1421 1422 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); 1423 lreq->req_state = lc->lcontext.LeaseState; 1424 lreq->flags = lc->lcontext.LeaseFlags; 1425 lreq->duration = lc->lcontext.LeaseDuration; 1426 memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey, 1427 SMB2_LEASE_KEY_SIZE); 1428 lreq->version = 2; 1429 } else { 1430 struct create_lease *lc = (struct create_lease *)cc; 1431 1432 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); 1433 lreq->req_state = lc->lcontext.LeaseState; 1434 lreq->flags = lc->lcontext.LeaseFlags; 1435 lreq->duration = lc->lcontext.LeaseDuration; 1436 lreq->version = 1; 1437 } 1438 return lreq; 1439 } 1440 1441 /** 1442 * smb2_find_context_vals() - find a particular context info in open request 1443 * @open_req: buffer containing smb2 file open(create) request 1444 * @tag: context name to search for 1445 * @tag_len: the length of tag 1446 * 1447 * Return: pointer to requested context, NULL if @str context not found 1448 * or error pointer if name length is invalid. 1449 */ 1450 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len) 1451 { 1452 struct create_context *cc; 1453 unsigned int next = 0; 1454 char *name; 1455 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1456 unsigned int remain_len, name_off, name_len, value_off, value_len, 1457 cc_len; 1458 1459 /* 1460 * CreateContextsOffset and CreateContextsLength are guaranteed to 1461 * be valid because of ksmbd_smb2_check_message(). 1462 */ 1463 cc = (struct create_context *)((char *)req + 1464 le32_to_cpu(req->CreateContextsOffset)); 1465 remain_len = le32_to_cpu(req->CreateContextsLength); 1466 do { 1467 cc = (struct create_context *)((char *)cc + next); 1468 if (remain_len < offsetof(struct create_context, Buffer)) 1469 return ERR_PTR(-EINVAL); 1470 1471 next = le32_to_cpu(cc->Next); 1472 name_off = le16_to_cpu(cc->NameOffset); 1473 name_len = le16_to_cpu(cc->NameLength); 1474 value_off = le16_to_cpu(cc->DataOffset); 1475 value_len = le32_to_cpu(cc->DataLength); 1476 cc_len = next ? next : remain_len; 1477 1478 if ((next & 0x7) != 0 || 1479 next > remain_len || 1480 name_off != offsetof(struct create_context, Buffer) || 1481 name_len < 4 || 1482 name_off + name_len > cc_len || 1483 (value_off & 0x7) != 0 || 1484 (value_len && value_off < name_off + (name_len < 8 ? 8 : name_len)) || 1485 ((u64)value_off + value_len > cc_len)) 1486 return ERR_PTR(-EINVAL); 1487 1488 name = (char *)cc + name_off; 1489 if (name_len == tag_len && !memcmp(name, tag, name_len)) 1490 return cc; 1491 1492 remain_len -= next; 1493 } while (next != 0); 1494 1495 return NULL; 1496 } 1497 1498 /** 1499 * create_durable_rsp_buf() - create durable handle context 1500 * @cc: buffer to create durable context response 1501 */ 1502 void create_durable_rsp_buf(char *cc) 1503 { 1504 struct create_durable_rsp *buf; 1505 1506 buf = (struct create_durable_rsp *)cc; 1507 memset(buf, 0, sizeof(struct create_durable_rsp)); 1508 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1509 (struct create_durable_rsp, Data)); 1510 buf->ccontext.DataLength = cpu_to_le32(8); 1511 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1512 (struct create_durable_rsp, Name)); 1513 buf->ccontext.NameLength = cpu_to_le16(4); 1514 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */ 1515 buf->Name[0] = 'D'; 1516 buf->Name[1] = 'H'; 1517 buf->Name[2] = 'n'; 1518 buf->Name[3] = 'Q'; 1519 } 1520 1521 /** 1522 * create_durable_v2_rsp_buf() - create durable handle v2 context 1523 * @cc: buffer to create durable context response 1524 * @fp: ksmbd file pointer 1525 */ 1526 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp) 1527 { 1528 struct create_durable_v2_rsp *buf; 1529 1530 buf = (struct create_durable_v2_rsp *)cc; 1531 memset(buf, 0, sizeof(struct create_durable_rsp)); 1532 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1533 (struct create_durable_rsp, Data)); 1534 buf->ccontext.DataLength = cpu_to_le32(8); 1535 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1536 (struct create_durable_rsp, Name)); 1537 buf->ccontext.NameLength = cpu_to_le16(4); 1538 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */ 1539 buf->Name[0] = 'D'; 1540 buf->Name[1] = 'H'; 1541 buf->Name[2] = '2'; 1542 buf->Name[3] = 'Q'; 1543 1544 buf->Timeout = cpu_to_le32(fp->durable_timeout); 1545 } 1546 1547 /** 1548 * create_mxac_rsp_buf() - create query maximal access context 1549 * @cc: buffer to create maximal access context response 1550 * @maximal_access: maximal access 1551 */ 1552 void create_mxac_rsp_buf(char *cc, int maximal_access) 1553 { 1554 struct create_mxac_rsp *buf; 1555 1556 buf = (struct create_mxac_rsp *)cc; 1557 memset(buf, 0, sizeof(struct create_mxac_rsp)); 1558 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1559 (struct create_mxac_rsp, QueryStatus)); 1560 buf->ccontext.DataLength = cpu_to_le32(8); 1561 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1562 (struct create_mxac_rsp, Name)); 1563 buf->ccontext.NameLength = cpu_to_le16(4); 1564 /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */ 1565 buf->Name[0] = 'M'; 1566 buf->Name[1] = 'x'; 1567 buf->Name[2] = 'A'; 1568 buf->Name[3] = 'c'; 1569 1570 buf->QueryStatus = STATUS_SUCCESS; 1571 buf->MaximalAccess = cpu_to_le32(maximal_access); 1572 } 1573 1574 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id) 1575 { 1576 struct create_disk_id_rsp *buf; 1577 1578 buf = (struct create_disk_id_rsp *)cc; 1579 memset(buf, 0, sizeof(struct create_disk_id_rsp)); 1580 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1581 (struct create_disk_id_rsp, DiskFileId)); 1582 buf->ccontext.DataLength = cpu_to_le32(32); 1583 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1584 (struct create_mxac_rsp, Name)); 1585 buf->ccontext.NameLength = cpu_to_le16(4); 1586 /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */ 1587 buf->Name[0] = 'Q'; 1588 buf->Name[1] = 'F'; 1589 buf->Name[2] = 'i'; 1590 buf->Name[3] = 'd'; 1591 1592 buf->DiskFileId = cpu_to_le64(file_id); 1593 buf->VolumeId = cpu_to_le64(vol_id); 1594 } 1595 1596 /** 1597 * create_posix_rsp_buf() - create posix extension context 1598 * @cc: buffer to create posix on posix response 1599 * @fp: ksmbd file pointer 1600 */ 1601 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp) 1602 { 1603 struct create_posix_rsp *buf; 1604 struct inode *inode = file_inode(fp->filp); 1605 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 1606 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode); 1607 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode); 1608 1609 buf = (struct create_posix_rsp *)cc; 1610 memset(buf, 0, sizeof(struct create_posix_rsp)); 1611 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1612 (struct create_posix_rsp, nlink)); 1613 /* 1614 * DataLength = nlink(4) + reparse_tag(4) + mode(4) + 1615 * domain sid(28) + unix group sid(16). 1616 */ 1617 buf->ccontext.DataLength = cpu_to_le32(56); 1618 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1619 (struct create_posix_rsp, Name)); 1620 buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 1621 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 1622 buf->Name[0] = 0x93; 1623 buf->Name[1] = 0xAD; 1624 buf->Name[2] = 0x25; 1625 buf->Name[3] = 0x50; 1626 buf->Name[4] = 0x9C; 1627 buf->Name[5] = 0xB4; 1628 buf->Name[6] = 0x11; 1629 buf->Name[7] = 0xE7; 1630 buf->Name[8] = 0xB4; 1631 buf->Name[9] = 0x23; 1632 buf->Name[10] = 0x83; 1633 buf->Name[11] = 0xDE; 1634 buf->Name[12] = 0x96; 1635 buf->Name[13] = 0x8B; 1636 buf->Name[14] = 0xCD; 1637 buf->Name[15] = 0x7C; 1638 1639 buf->nlink = cpu_to_le32(inode->i_nlink); 1640 buf->reparse_tag = cpu_to_le32(fp->volatile_id); 1641 buf->mode = cpu_to_le32(inode->i_mode & 0777); 1642 /* 1643 * SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)). 1644 * Domain sid(28) = revision(1) + num_subauth(1) + authority(6) + 1645 * sub_auth(4 * 4(num_subauth)) + RID(4). 1646 * UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) + 1647 * sub_auth(4 * 1(num_subauth)) + RID(4). 1648 */ 1649 id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)), 1650 SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]); 1651 id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)), 1652 SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]); 1653 } 1654 1655 /* 1656 * Find lease object(opinfo) for given lease key/fid from lease 1657 * break/file close path. 1658 */ 1659 /** 1660 * lookup_lease_in_table() - find a matching lease info object 1661 * @conn: connection instance 1662 * @lease_key: lease key to be searched for 1663 * 1664 * Return: opinfo if found matching opinfo, otherwise NULL 1665 */ 1666 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn, 1667 char *lease_key) 1668 { 1669 struct oplock_info *opinfo = NULL, *ret_op = NULL; 1670 struct lease_table *lt; 1671 int ret; 1672 1673 read_lock(&lease_list_lock); 1674 list_for_each_entry(lt, &lease_table_list, l_entry) { 1675 if (!memcmp(lt->client_guid, conn->ClientGUID, 1676 SMB2_CLIENT_GUID_SIZE)) 1677 goto found; 1678 } 1679 1680 read_unlock(&lease_list_lock); 1681 return NULL; 1682 1683 found: 1684 rcu_read_lock(); 1685 list_for_each_entry_rcu(opinfo, <->lease_list, lease_entry) { 1686 if (!atomic_inc_not_zero(&opinfo->refcount)) 1687 continue; 1688 rcu_read_unlock(); 1689 if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING) 1690 goto op_next; 1691 if (!(opinfo->o_lease->state & 1692 (SMB2_LEASE_HANDLE_CACHING_LE | 1693 SMB2_LEASE_WRITE_CACHING_LE))) 1694 goto op_next; 1695 ret = compare_guid_key(opinfo, conn->ClientGUID, 1696 lease_key); 1697 if (ret) { 1698 ksmbd_debug(OPLOCK, "found opinfo\n"); 1699 ret_op = opinfo; 1700 goto out; 1701 } 1702 op_next: 1703 opinfo_put(opinfo); 1704 rcu_read_lock(); 1705 } 1706 rcu_read_unlock(); 1707 1708 out: 1709 read_unlock(&lease_list_lock); 1710 return ret_op; 1711 } 1712