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 static inline int allocate_oplock_break_buf(struct ksmbd_work *work) 620 { 621 work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL); 622 if (!work->response_buf) 623 return -ENOMEM; 624 work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE; 625 return 0; 626 } 627 628 /** 629 * __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn 630 * to client 631 * @wk: smb work object 632 * 633 * There are two ways this function can be called. 1- while file open we break 634 * from exclusive/batch lock to levelII oplock and 2- while file write/truncate 635 * we break from levelII oplock no oplock. 636 * work->request_buf contains oplock_info. 637 */ 638 static void __smb2_oplock_break_noti(struct work_struct *wk) 639 { 640 struct smb2_oplock_break *rsp = NULL; 641 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); 642 struct ksmbd_conn *conn = work->conn; 643 struct oplock_break_info *br_info = work->request_buf; 644 struct smb2_hdr *rsp_hdr; 645 struct ksmbd_file *fp; 646 647 fp = ksmbd_lookup_durable_fd(br_info->fid); 648 if (!fp) 649 goto out; 650 651 if (allocate_oplock_break_buf(work)) { 652 pr_err("smb2_allocate_rsp_buf failed! "); 653 ksmbd_fd_put(work, fp); 654 goto out; 655 } 656 657 rsp_hdr = smb2_get_msg(work->response_buf); 658 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2); 659 *(__be32 *)work->response_buf = 660 cpu_to_be32(conn->vals->header_size); 661 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER; 662 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE; 663 rsp_hdr->CreditRequest = cpu_to_le16(0); 664 rsp_hdr->Command = SMB2_OPLOCK_BREAK; 665 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR); 666 rsp_hdr->NextCommand = 0; 667 rsp_hdr->MessageId = cpu_to_le64(-1); 668 rsp_hdr->Id.SyncId.ProcessId = 0; 669 rsp_hdr->Id.SyncId.TreeId = 0; 670 rsp_hdr->SessionId = 0; 671 memset(rsp_hdr->Signature, 0, 16); 672 673 rsp = smb2_get_msg(work->response_buf); 674 675 rsp->StructureSize = cpu_to_le16(24); 676 if (!br_info->open_trunc && 677 (br_info->level == SMB2_OPLOCK_LEVEL_BATCH || 678 br_info->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) 679 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_II; 680 else 681 rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE; 682 rsp->Reserved = 0; 683 rsp->Reserved2 = 0; 684 rsp->PersistentFid = fp->persistent_id; 685 rsp->VolatileFid = fp->volatile_id; 686 687 inc_rfc1001_len(work->response_buf, 24); 688 689 ksmbd_debug(OPLOCK, 690 "sending oplock break v_id %llu p_id = %llu lock level = %d\n", 691 rsp->VolatileFid, rsp->PersistentFid, rsp->OplockLevel); 692 693 ksmbd_fd_put(work, fp); 694 ksmbd_conn_write(work); 695 696 out: 697 ksmbd_free_work_struct(work); 698 } 699 700 /** 701 * smb2_oplock_break_noti() - send smb2 exclusive/batch to level2 oplock 702 * break command from server to client 703 * @opinfo: oplock info object 704 * 705 * Return: 0 on success, otherwise error 706 */ 707 static int smb2_oplock_break_noti(struct oplock_info *opinfo) 708 { 709 struct ksmbd_conn *conn = opinfo->conn; 710 struct oplock_break_info *br_info; 711 int ret = 0; 712 struct ksmbd_work *work = ksmbd_alloc_work_struct(); 713 714 if (!work) 715 return -ENOMEM; 716 717 br_info = kmalloc(sizeof(struct oplock_break_info), GFP_KERNEL); 718 if (!br_info) { 719 ksmbd_free_work_struct(work); 720 return -ENOMEM; 721 } 722 723 br_info->level = opinfo->level; 724 br_info->fid = opinfo->fid; 725 br_info->open_trunc = opinfo->open_trunc; 726 727 work->request_buf = (char *)br_info; 728 work->conn = conn; 729 work->sess = opinfo->sess; 730 731 if (opinfo->op_state == OPLOCK_ACK_WAIT) { 732 INIT_WORK(&work->work, __smb2_oplock_break_noti); 733 ksmbd_queue_work(work); 734 735 wait_for_break_ack(opinfo); 736 } else { 737 __smb2_oplock_break_noti(&work->work); 738 if (opinfo->level == SMB2_OPLOCK_LEVEL_II) 739 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 740 } 741 return ret; 742 } 743 744 /** 745 * __smb2_lease_break_noti() - send lease break command from server 746 * to client 747 * @wk: smb work object 748 */ 749 static void __smb2_lease_break_noti(struct work_struct *wk) 750 { 751 struct smb2_lease_break *rsp = NULL; 752 struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work); 753 struct lease_break_info *br_info = work->request_buf; 754 struct ksmbd_conn *conn = work->conn; 755 struct smb2_hdr *rsp_hdr; 756 757 if (allocate_oplock_break_buf(work)) { 758 ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! "); 759 goto out; 760 } 761 762 rsp_hdr = smb2_get_msg(work->response_buf); 763 memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2); 764 *(__be32 *)work->response_buf = 765 cpu_to_be32(conn->vals->header_size); 766 rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER; 767 rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE; 768 rsp_hdr->CreditRequest = cpu_to_le16(0); 769 rsp_hdr->Command = SMB2_OPLOCK_BREAK; 770 rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR); 771 rsp_hdr->NextCommand = 0; 772 rsp_hdr->MessageId = cpu_to_le64(-1); 773 rsp_hdr->Id.SyncId.ProcessId = 0; 774 rsp_hdr->Id.SyncId.TreeId = 0; 775 rsp_hdr->SessionId = 0; 776 memset(rsp_hdr->Signature, 0, 16); 777 778 rsp = smb2_get_msg(work->response_buf); 779 rsp->StructureSize = cpu_to_le16(44); 780 rsp->Epoch = br_info->epoch; 781 rsp->Flags = 0; 782 783 if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING_LE | 784 SMB2_LEASE_HANDLE_CACHING_LE)) 785 rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED; 786 787 memcpy(rsp->LeaseKey, br_info->lease_key, SMB2_LEASE_KEY_SIZE); 788 rsp->CurrentLeaseState = br_info->curr_state; 789 rsp->NewLeaseState = br_info->new_state; 790 rsp->BreakReason = 0; 791 rsp->AccessMaskHint = 0; 792 rsp->ShareMaskHint = 0; 793 794 inc_rfc1001_len(work->response_buf, 44); 795 796 ksmbd_conn_write(work); 797 798 out: 799 ksmbd_free_work_struct(work); 800 } 801 802 /** 803 * smb2_lease_break_noti() - break lease when a new client request 804 * write lease 805 * @opinfo: conains lease state information 806 * 807 * Return: 0 on success, otherwise error 808 */ 809 static int smb2_lease_break_noti(struct oplock_info *opinfo) 810 { 811 struct ksmbd_conn *conn = opinfo->conn; 812 struct list_head *tmp, *t; 813 struct ksmbd_work *work; 814 struct lease_break_info *br_info; 815 struct lease *lease = opinfo->o_lease; 816 817 work = ksmbd_alloc_work_struct(); 818 if (!work) 819 return -ENOMEM; 820 821 br_info = kmalloc(sizeof(struct lease_break_info), GFP_KERNEL); 822 if (!br_info) { 823 ksmbd_free_work_struct(work); 824 return -ENOMEM; 825 } 826 827 br_info->curr_state = lease->state; 828 br_info->new_state = lease->new_state; 829 if (lease->version == 2) 830 br_info->epoch = cpu_to_le16(++lease->epoch); 831 else 832 br_info->epoch = 0; 833 memcpy(br_info->lease_key, lease->lease_key, SMB2_LEASE_KEY_SIZE); 834 835 work->request_buf = (char *)br_info; 836 work->conn = conn; 837 work->sess = opinfo->sess; 838 839 if (opinfo->op_state == OPLOCK_ACK_WAIT) { 840 list_for_each_safe(tmp, t, &opinfo->interim_list) { 841 struct ksmbd_work *in_work; 842 843 in_work = list_entry(tmp, struct ksmbd_work, 844 interim_entry); 845 setup_async_work(in_work, NULL, NULL); 846 smb2_send_interim_resp(in_work, STATUS_PENDING); 847 list_del(&in_work->interim_entry); 848 } 849 INIT_WORK(&work->work, __smb2_lease_break_noti); 850 ksmbd_queue_work(work); 851 wait_for_break_ack(opinfo); 852 } else { 853 __smb2_lease_break_noti(&work->work); 854 if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) { 855 opinfo->level = SMB2_OPLOCK_LEVEL_NONE; 856 opinfo->o_lease->state = SMB2_LEASE_NONE_LE; 857 } 858 } 859 return 0; 860 } 861 862 static void wait_lease_breaking(struct oplock_info *opinfo) 863 { 864 if (!opinfo->is_lease) 865 return; 866 867 wake_up_interruptible_all(&opinfo->oplock_brk); 868 if (atomic_read(&opinfo->breaking_cnt)) { 869 int ret = 0; 870 871 ret = wait_event_interruptible_timeout(opinfo->oplock_brk, 872 atomic_read(&opinfo->breaking_cnt) == 0, 873 HZ); 874 if (!ret) 875 atomic_set(&opinfo->breaking_cnt, 0); 876 } 877 } 878 879 static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level) 880 { 881 int err = 0; 882 883 /* Need to break exclusive/batch oplock, write lease or overwrite_if */ 884 ksmbd_debug(OPLOCK, 885 "request to send oplock(level : 0x%x) break notification\n", 886 brk_opinfo->level); 887 888 if (brk_opinfo->is_lease) { 889 struct lease *lease = brk_opinfo->o_lease; 890 891 atomic_inc(&brk_opinfo->breaking_cnt); 892 893 err = oplock_break_pending(brk_opinfo, req_op_level); 894 if (err) 895 return err < 0 ? err : 0; 896 897 if (brk_opinfo->open_trunc) { 898 /* 899 * Create overwrite break trigger the lease break to 900 * none. 901 */ 902 lease->new_state = SMB2_LEASE_NONE_LE; 903 } else { 904 if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) { 905 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 906 lease->new_state = 907 SMB2_LEASE_READ_CACHING_LE | 908 SMB2_LEASE_HANDLE_CACHING_LE; 909 else 910 lease->new_state = 911 SMB2_LEASE_READ_CACHING_LE; 912 } else { 913 if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE) 914 lease->new_state = 915 SMB2_LEASE_READ_CACHING_LE; 916 else 917 lease->new_state = SMB2_LEASE_NONE_LE; 918 } 919 } 920 921 if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE | 922 SMB2_LEASE_HANDLE_CACHING_LE)) 923 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 924 else 925 atomic_dec(&brk_opinfo->breaking_cnt); 926 } else { 927 err = oplock_break_pending(brk_opinfo, req_op_level); 928 if (err) 929 return err < 0 ? err : 0; 930 931 if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH || 932 brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) 933 brk_opinfo->op_state = OPLOCK_ACK_WAIT; 934 } 935 936 if (brk_opinfo->is_lease) 937 err = smb2_lease_break_noti(brk_opinfo); 938 else 939 err = smb2_oplock_break_noti(brk_opinfo); 940 941 ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level); 942 if (brk_opinfo->op_state == OPLOCK_CLOSING) 943 err = -ENOENT; 944 wake_up_oplock_break(brk_opinfo); 945 946 wait_lease_breaking(brk_opinfo); 947 948 return err; 949 } 950 951 void destroy_lease_table(struct ksmbd_conn *conn) 952 { 953 struct lease_table *lb, *lbtmp; 954 struct oplock_info *opinfo; 955 956 write_lock(&lease_list_lock); 957 if (list_empty(&lease_table_list)) { 958 write_unlock(&lease_list_lock); 959 return; 960 } 961 962 list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) { 963 if (conn && memcmp(lb->client_guid, conn->ClientGUID, 964 SMB2_CLIENT_GUID_SIZE)) 965 continue; 966 again: 967 rcu_read_lock(); 968 list_for_each_entry_rcu(opinfo, &lb->lease_list, 969 lease_entry) { 970 rcu_read_unlock(); 971 lease_del_list(opinfo); 972 goto again; 973 } 974 rcu_read_unlock(); 975 list_del(&lb->l_entry); 976 kfree(lb); 977 } 978 write_unlock(&lease_list_lock); 979 } 980 981 int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci, 982 struct lease_ctx_info *lctx) 983 { 984 struct oplock_info *opinfo; 985 int err = 0; 986 struct lease_table *lb; 987 988 if (!lctx) 989 return err; 990 991 read_lock(&lease_list_lock); 992 if (list_empty(&lease_table_list)) { 993 read_unlock(&lease_list_lock); 994 return 0; 995 } 996 997 list_for_each_entry(lb, &lease_table_list, l_entry) { 998 if (!memcmp(lb->client_guid, sess->ClientGUID, 999 SMB2_CLIENT_GUID_SIZE)) 1000 goto found; 1001 } 1002 read_unlock(&lease_list_lock); 1003 1004 return 0; 1005 1006 found: 1007 rcu_read_lock(); 1008 list_for_each_entry_rcu(opinfo, &lb->lease_list, lease_entry) { 1009 if (!atomic_inc_not_zero(&opinfo->refcount)) 1010 continue; 1011 rcu_read_unlock(); 1012 if (opinfo->o_fp->f_ci == ci) 1013 goto op_next; 1014 err = compare_guid_key(opinfo, sess->ClientGUID, 1015 lctx->lease_key); 1016 if (err) { 1017 err = -EINVAL; 1018 ksmbd_debug(OPLOCK, 1019 "found same lease key is already used in other files\n"); 1020 opinfo_put(opinfo); 1021 goto out; 1022 } 1023 op_next: 1024 opinfo_put(opinfo); 1025 rcu_read_lock(); 1026 } 1027 rcu_read_unlock(); 1028 1029 out: 1030 read_unlock(&lease_list_lock); 1031 return err; 1032 } 1033 1034 static void copy_lease(struct oplock_info *op1, struct oplock_info *op2) 1035 { 1036 struct lease *lease1 = op1->o_lease; 1037 struct lease *lease2 = op2->o_lease; 1038 1039 op2->level = op1->level; 1040 lease2->state = lease1->state; 1041 memcpy(lease2->lease_key, lease1->lease_key, 1042 SMB2_LEASE_KEY_SIZE); 1043 lease2->duration = lease1->duration; 1044 lease2->flags = lease1->flags; 1045 } 1046 1047 static int add_lease_global_list(struct oplock_info *opinfo) 1048 { 1049 struct lease_table *lb; 1050 1051 read_lock(&lease_list_lock); 1052 list_for_each_entry(lb, &lease_table_list, l_entry) { 1053 if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID, 1054 SMB2_CLIENT_GUID_SIZE)) { 1055 opinfo->o_lease->l_lb = lb; 1056 lease_add_list(opinfo); 1057 read_unlock(&lease_list_lock); 1058 return 0; 1059 } 1060 } 1061 read_unlock(&lease_list_lock); 1062 1063 lb = kmalloc(sizeof(struct lease_table), GFP_KERNEL); 1064 if (!lb) 1065 return -ENOMEM; 1066 1067 memcpy(lb->client_guid, opinfo->conn->ClientGUID, 1068 SMB2_CLIENT_GUID_SIZE); 1069 INIT_LIST_HEAD(&lb->lease_list); 1070 spin_lock_init(&lb->lb_lock); 1071 opinfo->o_lease->l_lb = lb; 1072 lease_add_list(opinfo); 1073 lb_add(lb); 1074 return 0; 1075 } 1076 1077 static void set_oplock_level(struct oplock_info *opinfo, int level, 1078 struct lease_ctx_info *lctx) 1079 { 1080 switch (level) { 1081 case SMB2_OPLOCK_LEVEL_BATCH: 1082 case SMB2_OPLOCK_LEVEL_EXCLUSIVE: 1083 grant_write_oplock(opinfo, level, lctx); 1084 break; 1085 case SMB2_OPLOCK_LEVEL_II: 1086 grant_read_oplock(opinfo, lctx); 1087 break; 1088 default: 1089 grant_none_oplock(opinfo, lctx); 1090 break; 1091 } 1092 } 1093 1094 /** 1095 * smb_grant_oplock() - handle oplock/lease request on file open 1096 * @work: smb work 1097 * @req_op_level: oplock level 1098 * @pid: id of open file 1099 * @fp: ksmbd file pointer 1100 * @tid: Tree id of connection 1101 * @lctx: lease context information on file open 1102 * @share_ret: share mode 1103 * 1104 * Return: 0 on success, otherwise error 1105 */ 1106 int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid, 1107 struct ksmbd_file *fp, __u16 tid, 1108 struct lease_ctx_info *lctx, int share_ret) 1109 { 1110 struct ksmbd_session *sess = work->sess; 1111 int err = 0; 1112 struct oplock_info *opinfo = NULL, *prev_opinfo = NULL; 1113 struct ksmbd_inode *ci = fp->f_ci; 1114 bool prev_op_has_lease; 1115 __le32 prev_op_state = 0; 1116 1117 /* not support directory lease */ 1118 if (S_ISDIR(file_inode(fp->filp)->i_mode)) 1119 return 0; 1120 1121 opinfo = alloc_opinfo(work, pid, tid); 1122 if (!opinfo) 1123 return -ENOMEM; 1124 1125 if (lctx) { 1126 err = alloc_lease(opinfo, lctx); 1127 if (err) 1128 goto err_out; 1129 opinfo->is_lease = 1; 1130 } 1131 1132 /* ci does not have any oplock */ 1133 if (!opinfo_count(fp)) 1134 goto set_lev; 1135 1136 /* grant none-oplock if second open is trunc */ 1137 if (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE && 1138 fp->cdoption != FILE_OVERWRITE_LE && 1139 fp->cdoption != FILE_SUPERSEDE_LE) { 1140 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1141 goto set_lev; 1142 } 1143 1144 if (lctx) { 1145 struct oplock_info *m_opinfo; 1146 1147 /* is lease already granted ? */ 1148 m_opinfo = same_client_has_lease(ci, sess->ClientGUID, 1149 lctx); 1150 if (m_opinfo) { 1151 copy_lease(m_opinfo, opinfo); 1152 if (atomic_read(&m_opinfo->breaking_cnt)) 1153 opinfo->o_lease->flags = 1154 SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE; 1155 goto out; 1156 } 1157 } 1158 prev_opinfo = opinfo_get_list(ci); 1159 if (!prev_opinfo || 1160 (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx)) { 1161 opinfo_conn_put(prev_opinfo); 1162 goto set_lev; 1163 } 1164 prev_op_has_lease = prev_opinfo->is_lease; 1165 if (prev_op_has_lease) 1166 prev_op_state = prev_opinfo->o_lease->state; 1167 1168 if (share_ret < 0 && 1169 prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1170 err = share_ret; 1171 opinfo_conn_put(prev_opinfo); 1172 goto err_out; 1173 } 1174 1175 if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1176 prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1177 opinfo_conn_put(prev_opinfo); 1178 goto op_break_not_needed; 1179 } 1180 1181 list_add(&work->interim_entry, &prev_opinfo->interim_list); 1182 err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II); 1183 opinfo_conn_put(prev_opinfo); 1184 if (err == -ENOENT) 1185 goto set_lev; 1186 /* Check all oplock was freed by close */ 1187 else if (err < 0) 1188 goto err_out; 1189 1190 op_break_not_needed: 1191 if (share_ret < 0) { 1192 err = share_ret; 1193 goto err_out; 1194 } 1195 1196 if (req_op_level != SMB2_OPLOCK_LEVEL_NONE) 1197 req_op_level = SMB2_OPLOCK_LEVEL_II; 1198 1199 /* grant fixed oplock on stacked locking between lease and oplock */ 1200 if (prev_op_has_lease && !lctx) 1201 if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE) 1202 req_op_level = SMB2_OPLOCK_LEVEL_NONE; 1203 1204 if (!prev_op_has_lease && lctx) { 1205 req_op_level = SMB2_OPLOCK_LEVEL_II; 1206 lctx->req_state = SMB2_LEASE_READ_CACHING_LE; 1207 } 1208 1209 set_lev: 1210 set_oplock_level(opinfo, req_op_level, lctx); 1211 1212 out: 1213 rcu_assign_pointer(fp->f_opinfo, opinfo); 1214 opinfo->o_fp = fp; 1215 1216 opinfo_count_inc(fp); 1217 opinfo_add(opinfo); 1218 if (opinfo->is_lease) { 1219 err = add_lease_global_list(opinfo); 1220 if (err) 1221 goto err_out; 1222 } 1223 1224 return 0; 1225 err_out: 1226 free_opinfo(opinfo); 1227 return err; 1228 } 1229 1230 /** 1231 * smb_break_all_write_oplock() - break batch/exclusive oplock to level2 1232 * @work: smb work 1233 * @fp: ksmbd file pointer 1234 * @is_trunc: truncate on open 1235 */ 1236 static void smb_break_all_write_oplock(struct ksmbd_work *work, 1237 struct ksmbd_file *fp, int is_trunc) 1238 { 1239 struct oplock_info *brk_opinfo; 1240 1241 brk_opinfo = opinfo_get_list(fp->f_ci); 1242 if (!brk_opinfo) 1243 return; 1244 if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH && 1245 brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) { 1246 opinfo_conn_put(brk_opinfo); 1247 return; 1248 } 1249 1250 brk_opinfo->open_trunc = is_trunc; 1251 list_add(&work->interim_entry, &brk_opinfo->interim_list); 1252 oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II); 1253 opinfo_conn_put(brk_opinfo); 1254 } 1255 1256 /** 1257 * smb_break_all_levII_oplock() - send level2 oplock or read lease break command 1258 * from server to client 1259 * @work: smb work 1260 * @fp: ksmbd file pointer 1261 * @is_trunc: truncate on open 1262 */ 1263 void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp, 1264 int is_trunc) 1265 { 1266 struct oplock_info *op, *brk_op; 1267 struct ksmbd_inode *ci; 1268 struct ksmbd_conn *conn = work->conn; 1269 1270 if (!test_share_config_flag(work->tcon->share_conf, 1271 KSMBD_SHARE_FLAG_OPLOCKS)) 1272 return; 1273 1274 ci = fp->f_ci; 1275 op = opinfo_get(fp); 1276 1277 rcu_read_lock(); 1278 list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) { 1279 if (!atomic_inc_not_zero(&brk_op->refcount)) 1280 continue; 1281 1282 atomic_inc(&brk_op->conn->r_count); 1283 if (ksmbd_conn_releasing(brk_op->conn)) { 1284 atomic_dec(&brk_op->conn->r_count); 1285 continue; 1286 } 1287 1288 rcu_read_unlock(); 1289 if (brk_op->is_lease && (brk_op->o_lease->state & 1290 (~(SMB2_LEASE_READ_CACHING_LE | 1291 SMB2_LEASE_HANDLE_CACHING_LE)))) { 1292 ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n", 1293 brk_op->o_lease->state); 1294 goto next; 1295 } else if (brk_op->level != 1296 SMB2_OPLOCK_LEVEL_II) { 1297 ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n", 1298 brk_op->level); 1299 goto next; 1300 } 1301 1302 /* Skip oplock being break to none */ 1303 if (brk_op->is_lease && 1304 brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE && 1305 atomic_read(&brk_op->breaking_cnt)) 1306 goto next; 1307 1308 if (op && op->is_lease && brk_op->is_lease && 1309 !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID, 1310 SMB2_CLIENT_GUID_SIZE) && 1311 !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key, 1312 SMB2_LEASE_KEY_SIZE)) 1313 goto next; 1314 brk_op->open_trunc = is_trunc; 1315 oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE); 1316 next: 1317 opinfo_conn_put(brk_op); 1318 rcu_read_lock(); 1319 } 1320 rcu_read_unlock(); 1321 1322 if (op) 1323 opinfo_put(op); 1324 } 1325 1326 /** 1327 * smb_break_all_oplock() - break both batch/exclusive and level2 oplock 1328 * @work: smb work 1329 * @fp: ksmbd file pointer 1330 */ 1331 void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp) 1332 { 1333 if (!test_share_config_flag(work->tcon->share_conf, 1334 KSMBD_SHARE_FLAG_OPLOCKS)) 1335 return; 1336 1337 smb_break_all_write_oplock(work, fp, 1); 1338 smb_break_all_levII_oplock(work, fp, 1); 1339 } 1340 1341 /** 1342 * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type 1343 * @lease_state: lease type 1344 * 1345 * Return: 0 if no mapping, otherwise corresponding oplock type 1346 */ 1347 __u8 smb2_map_lease_to_oplock(__le32 lease_state) 1348 { 1349 if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE | 1350 SMB2_LEASE_READ_CACHING_LE | 1351 SMB2_LEASE_WRITE_CACHING_LE)) { 1352 return SMB2_OPLOCK_LEVEL_BATCH; 1353 } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE && 1354 lease_state & SMB2_LEASE_WRITE_CACHING_LE) { 1355 if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE)) 1356 return SMB2_OPLOCK_LEVEL_EXCLUSIVE; 1357 } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) { 1358 return SMB2_OPLOCK_LEVEL_II; 1359 } 1360 return 0; 1361 } 1362 1363 /** 1364 * create_lease_buf() - create lease context for open cmd response 1365 * @rbuf: buffer to create lease context response 1366 * @lease: buffer to stored parsed lease state information 1367 */ 1368 void create_lease_buf(u8 *rbuf, struct lease *lease) 1369 { 1370 if (lease->version == 2) { 1371 struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf; 1372 1373 memset(buf, 0, sizeof(struct create_lease_v2)); 1374 memcpy(buf->lcontext.LeaseKey, lease->lease_key, 1375 SMB2_LEASE_KEY_SIZE); 1376 buf->lcontext.LeaseFlags = lease->flags; 1377 buf->lcontext.LeaseState = lease->state; 1378 memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key, 1379 SMB2_LEASE_KEY_SIZE); 1380 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1381 (struct create_lease_v2, lcontext)); 1382 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2)); 1383 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1384 (struct create_lease_v2, Name)); 1385 buf->ccontext.NameLength = cpu_to_le16(4); 1386 buf->Name[0] = 'R'; 1387 buf->Name[1] = 'q'; 1388 buf->Name[2] = 'L'; 1389 buf->Name[3] = 's'; 1390 } else { 1391 struct create_lease *buf = (struct create_lease *)rbuf; 1392 1393 memset(buf, 0, sizeof(struct create_lease)); 1394 memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE); 1395 buf->lcontext.LeaseFlags = lease->flags; 1396 buf->lcontext.LeaseState = lease->state; 1397 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1398 (struct create_lease, lcontext)); 1399 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context)); 1400 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1401 (struct create_lease, Name)); 1402 buf->ccontext.NameLength = cpu_to_le16(4); 1403 buf->Name[0] = 'R'; 1404 buf->Name[1] = 'q'; 1405 buf->Name[2] = 'L'; 1406 buf->Name[3] = 's'; 1407 } 1408 } 1409 1410 /** 1411 * parse_lease_state() - parse lease context containted in file open request 1412 * @open_req: buffer containing smb2 file open(create) request 1413 * 1414 * Return: oplock state, -ENOENT if create lease context not found 1415 */ 1416 struct lease_ctx_info *parse_lease_state(void *open_req) 1417 { 1418 struct create_context *cc; 1419 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1420 struct lease_ctx_info *lreq; 1421 1422 cc = smb2_find_context_vals(req, SMB2_CREATE_REQUEST_LEASE, 4); 1423 if (IS_ERR_OR_NULL(cc)) 1424 return NULL; 1425 1426 lreq = kzalloc(sizeof(struct lease_ctx_info), GFP_KERNEL); 1427 if (!lreq) 1428 return NULL; 1429 1430 if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) { 1431 struct create_lease_v2 *lc = (struct create_lease_v2 *)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 memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey, 1438 SMB2_LEASE_KEY_SIZE); 1439 lreq->version = 2; 1440 } else { 1441 struct create_lease *lc = (struct create_lease *)cc; 1442 1443 memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); 1444 lreq->req_state = lc->lcontext.LeaseState; 1445 lreq->flags = lc->lcontext.LeaseFlags; 1446 lreq->duration = lc->lcontext.LeaseDuration; 1447 lreq->version = 1; 1448 } 1449 return lreq; 1450 } 1451 1452 /** 1453 * smb2_find_context_vals() - find a particular context info in open request 1454 * @open_req: buffer containing smb2 file open(create) request 1455 * @tag: context name to search for 1456 * @tag_len: the length of tag 1457 * 1458 * Return: pointer to requested context, NULL if @str context not found 1459 * or error pointer if name length is invalid. 1460 */ 1461 struct create_context *smb2_find_context_vals(void *open_req, const char *tag, int tag_len) 1462 { 1463 struct create_context *cc; 1464 unsigned int next = 0; 1465 char *name; 1466 struct smb2_create_req *req = (struct smb2_create_req *)open_req; 1467 unsigned int remain_len, name_off, name_len, value_off, value_len, 1468 cc_len; 1469 1470 /* 1471 * CreateContextsOffset and CreateContextsLength are guaranteed to 1472 * be valid because of ksmbd_smb2_check_message(). 1473 */ 1474 cc = (struct create_context *)((char *)req + 1475 le32_to_cpu(req->CreateContextsOffset)); 1476 remain_len = le32_to_cpu(req->CreateContextsLength); 1477 do { 1478 cc = (struct create_context *)((char *)cc + next); 1479 if (remain_len < offsetof(struct create_context, Buffer)) 1480 return ERR_PTR(-EINVAL); 1481 1482 next = le32_to_cpu(cc->Next); 1483 name_off = le16_to_cpu(cc->NameOffset); 1484 name_len = le16_to_cpu(cc->NameLength); 1485 value_off = le16_to_cpu(cc->DataOffset); 1486 value_len = le32_to_cpu(cc->DataLength); 1487 cc_len = next ? next : remain_len; 1488 1489 if ((next & 0x7) != 0 || 1490 next > remain_len || 1491 name_off != offsetof(struct create_context, Buffer) || 1492 name_len < 4 || 1493 name_off + name_len > cc_len || 1494 (value_off & 0x7) != 0 || 1495 (value_off && (value_off < name_off + name_len)) || 1496 ((u64)value_off + value_len > cc_len)) 1497 return ERR_PTR(-EINVAL); 1498 1499 name = (char *)cc + name_off; 1500 if (name_len == tag_len && !memcmp(name, tag, name_len)) 1501 return cc; 1502 1503 remain_len -= next; 1504 } while (next != 0); 1505 1506 return NULL; 1507 } 1508 1509 /** 1510 * create_durable_rsp_buf() - create durable handle context 1511 * @cc: buffer to create durable context response 1512 */ 1513 void create_durable_rsp_buf(char *cc) 1514 { 1515 struct create_durable_rsp *buf; 1516 1517 buf = (struct create_durable_rsp *)cc; 1518 memset(buf, 0, sizeof(struct create_durable_rsp)); 1519 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1520 (struct create_durable_rsp, Data)); 1521 buf->ccontext.DataLength = cpu_to_le32(8); 1522 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1523 (struct create_durable_rsp, Name)); 1524 buf->ccontext.NameLength = cpu_to_le16(4); 1525 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */ 1526 buf->Name[0] = 'D'; 1527 buf->Name[1] = 'H'; 1528 buf->Name[2] = 'n'; 1529 buf->Name[3] = 'Q'; 1530 } 1531 1532 /** 1533 * create_durable_v2_rsp_buf() - create durable handle v2 context 1534 * @cc: buffer to create durable context response 1535 * @fp: ksmbd file pointer 1536 */ 1537 void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp) 1538 { 1539 struct create_durable_v2_rsp *buf; 1540 1541 buf = (struct create_durable_v2_rsp *)cc; 1542 memset(buf, 0, sizeof(struct create_durable_rsp)); 1543 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1544 (struct create_durable_rsp, Data)); 1545 buf->ccontext.DataLength = cpu_to_le32(8); 1546 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1547 (struct create_durable_rsp, Name)); 1548 buf->ccontext.NameLength = cpu_to_le16(4); 1549 /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */ 1550 buf->Name[0] = 'D'; 1551 buf->Name[1] = 'H'; 1552 buf->Name[2] = '2'; 1553 buf->Name[3] = 'Q'; 1554 1555 buf->Timeout = cpu_to_le32(fp->durable_timeout); 1556 } 1557 1558 /** 1559 * create_mxac_rsp_buf() - create query maximal access context 1560 * @cc: buffer to create maximal access context response 1561 * @maximal_access: maximal access 1562 */ 1563 void create_mxac_rsp_buf(char *cc, int maximal_access) 1564 { 1565 struct create_mxac_rsp *buf; 1566 1567 buf = (struct create_mxac_rsp *)cc; 1568 memset(buf, 0, sizeof(struct create_mxac_rsp)); 1569 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1570 (struct create_mxac_rsp, QueryStatus)); 1571 buf->ccontext.DataLength = cpu_to_le32(8); 1572 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1573 (struct create_mxac_rsp, Name)); 1574 buf->ccontext.NameLength = cpu_to_le16(4); 1575 /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */ 1576 buf->Name[0] = 'M'; 1577 buf->Name[1] = 'x'; 1578 buf->Name[2] = 'A'; 1579 buf->Name[3] = 'c'; 1580 1581 buf->QueryStatus = STATUS_SUCCESS; 1582 buf->MaximalAccess = cpu_to_le32(maximal_access); 1583 } 1584 1585 void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id) 1586 { 1587 struct create_disk_id_rsp *buf; 1588 1589 buf = (struct create_disk_id_rsp *)cc; 1590 memset(buf, 0, sizeof(struct create_disk_id_rsp)); 1591 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1592 (struct create_disk_id_rsp, DiskFileId)); 1593 buf->ccontext.DataLength = cpu_to_le32(32); 1594 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1595 (struct create_mxac_rsp, Name)); 1596 buf->ccontext.NameLength = cpu_to_le16(4); 1597 /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */ 1598 buf->Name[0] = 'Q'; 1599 buf->Name[1] = 'F'; 1600 buf->Name[2] = 'i'; 1601 buf->Name[3] = 'd'; 1602 1603 buf->DiskFileId = cpu_to_le64(file_id); 1604 buf->VolumeId = cpu_to_le64(vol_id); 1605 } 1606 1607 /** 1608 * create_posix_rsp_buf() - create posix extension context 1609 * @cc: buffer to create posix on posix response 1610 * @fp: ksmbd file pointer 1611 */ 1612 void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp) 1613 { 1614 struct create_posix_rsp *buf; 1615 struct inode *inode = file_inode(fp->filp); 1616 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 1617 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode); 1618 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode); 1619 1620 buf = (struct create_posix_rsp *)cc; 1621 memset(buf, 0, sizeof(struct create_posix_rsp)); 1622 buf->ccontext.DataOffset = cpu_to_le16(offsetof 1623 (struct create_posix_rsp, nlink)); 1624 /* 1625 * DataLength = nlink(4) + reparse_tag(4) + mode(4) + 1626 * domain sid(28) + unix group sid(16). 1627 */ 1628 buf->ccontext.DataLength = cpu_to_le32(56); 1629 buf->ccontext.NameOffset = cpu_to_le16(offsetof 1630 (struct create_posix_rsp, Name)); 1631 buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 1632 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 1633 buf->Name[0] = 0x93; 1634 buf->Name[1] = 0xAD; 1635 buf->Name[2] = 0x25; 1636 buf->Name[3] = 0x50; 1637 buf->Name[4] = 0x9C; 1638 buf->Name[5] = 0xB4; 1639 buf->Name[6] = 0x11; 1640 buf->Name[7] = 0xE7; 1641 buf->Name[8] = 0xB4; 1642 buf->Name[9] = 0x23; 1643 buf->Name[10] = 0x83; 1644 buf->Name[11] = 0xDE; 1645 buf->Name[12] = 0x96; 1646 buf->Name[13] = 0x8B; 1647 buf->Name[14] = 0xCD; 1648 buf->Name[15] = 0x7C; 1649 1650 buf->nlink = cpu_to_le32(inode->i_nlink); 1651 buf->reparse_tag = cpu_to_le32(fp->volatile_id); 1652 buf->mode = cpu_to_le32(inode->i_mode & 0777); 1653 /* 1654 * SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)). 1655 * Domain sid(28) = revision(1) + num_subauth(1) + authority(6) + 1656 * sub_auth(4 * 4(num_subauth)) + RID(4). 1657 * UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) + 1658 * sub_auth(4 * 1(num_subauth)) + RID(4). 1659 */ 1660 id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)), 1661 SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]); 1662 id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)), 1663 SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]); 1664 } 1665 1666 /* 1667 * Find lease object(opinfo) for given lease key/fid from lease 1668 * break/file close path. 1669 */ 1670 /** 1671 * lookup_lease_in_table() - find a matching lease info object 1672 * @conn: connection instance 1673 * @lease_key: lease key to be searched for 1674 * 1675 * Return: opinfo if found matching opinfo, otherwise NULL 1676 */ 1677 struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn, 1678 char *lease_key) 1679 { 1680 struct oplock_info *opinfo = NULL, *ret_op = NULL; 1681 struct lease_table *lt; 1682 int ret; 1683 1684 read_lock(&lease_list_lock); 1685 list_for_each_entry(lt, &lease_table_list, l_entry) { 1686 if (!memcmp(lt->client_guid, conn->ClientGUID, 1687 SMB2_CLIENT_GUID_SIZE)) 1688 goto found; 1689 } 1690 1691 read_unlock(&lease_list_lock); 1692 return NULL; 1693 1694 found: 1695 rcu_read_lock(); 1696 list_for_each_entry_rcu(opinfo, <->lease_list, lease_entry) { 1697 if (!atomic_inc_not_zero(&opinfo->refcount)) 1698 continue; 1699 rcu_read_unlock(); 1700 if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING) 1701 goto op_next; 1702 if (!(opinfo->o_lease->state & 1703 (SMB2_LEASE_HANDLE_CACHING_LE | 1704 SMB2_LEASE_WRITE_CACHING_LE))) 1705 goto op_next; 1706 ret = compare_guid_key(opinfo, conn->ClientGUID, 1707 lease_key); 1708 if (ret) { 1709 ksmbd_debug(OPLOCK, "found opinfo\n"); 1710 ret_op = opinfo; 1711 goto out; 1712 } 1713 op_next: 1714 opinfo_put(opinfo); 1715 rcu_read_lock(); 1716 } 1717 rcu_read_unlock(); 1718 1719 out: 1720 read_unlock(&lease_list_lock); 1721 return ret_op; 1722 } 1723