1 /* SPDX-License-Identifier: LGPL-2.1 */ 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2008 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * Jeremy Allison (jra@samba.org) 7 * 8 */ 9 #ifndef _CIFS_GLOB_H 10 #define _CIFS_GLOB_H 11 12 #include <linux/in.h> 13 #include <linux/in6.h> 14 #include <linux/inet.h> 15 #include <linux/slab.h> 16 #include <linux/scatterlist.h> 17 #include <linux/mm.h> 18 #include <linux/mempool.h> 19 #include <linux/workqueue.h> 20 #include <linux/utsname.h> 21 #include <linux/sched/mm.h> 22 #include <linux/netfs.h> 23 #include "cifs_fs_sb.h" 24 #include "cifsacl.h" 25 #include <crypto/internal/hash.h> 26 #include <uapi/linux/cifs/cifs_mount.h> 27 #include "../common/smb2pdu.h" 28 #include "smb2pdu.h" 29 #include <linux/filelock.h> 30 31 #define SMB_PATH_MAX 260 32 #define CIFS_PORT 445 33 #define RFC1001_PORT 139 34 35 /* 36 * The sizes of various internal tables and strings 37 */ 38 #define MAX_UID_INFO 16 39 #define MAX_SES_INFO 2 40 #define MAX_TCON_INFO 4 41 42 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1) 43 44 #define CIFS_MIN_RCV_POOL 4 45 46 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */ 47 /* 48 * default attribute cache timeout (jiffies) 49 */ 50 #define CIFS_DEF_ACTIMEO (1 * HZ) 51 52 /* 53 * max sleep time before retry to server 54 */ 55 #define CIFS_MAX_SLEEP 2000 56 57 /* 58 * max attribute cache timeout (jiffies) - 2^30 59 */ 60 #define CIFS_MAX_ACTIMEO (1 << 30) 61 62 /* 63 * Max persistent and resilient handle timeout (milliseconds). 64 * Windows durable max was 960000 (16 minutes) 65 */ 66 #define SMB3_MAX_HANDLE_TIMEOUT 960000 67 68 /* 69 * MAX_REQ is the maximum number of requests that WE will send 70 * on one socket concurrently. 71 */ 72 #define CIFS_MAX_REQ 32767 73 74 #define RFC1001_NAME_LEN 15 75 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1) 76 77 /* maximum length of ip addr as a string (including ipv6 and sctp) */ 78 #define SERVER_NAME_LENGTH 80 79 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1) 80 81 /* echo interval in seconds */ 82 #define SMB_ECHO_INTERVAL_MIN 1 83 #define SMB_ECHO_INTERVAL_MAX 600 84 #define SMB_ECHO_INTERVAL_DEFAULT 60 85 86 /* smb multichannel query server interfaces interval in seconds */ 87 #define SMB_INTERFACE_POLL_INTERVAL 600 88 89 /* maximum number of PDUs in one compound */ 90 #define MAX_COMPOUND 7 91 92 /* 93 * Default number of credits to keep available for SMB3. 94 * This value is chosen somewhat arbitrarily. The Windows client 95 * defaults to 128 credits, the Windows server allows clients up to 96 * 512 credits (or 8K for later versions), and the NetApp server 97 * does not limit clients at all. Choose a high enough default value 98 * such that the client shouldn't limit performance, but allow mount 99 * to override (until you approach 64K, where we limit credits to 65000 100 * to reduce possibility of seeing more server credit overflow bugs. 101 */ 102 #define SMB2_MAX_CREDITS_AVAILABLE 32000 103 104 #include "cifspdu.h" 105 106 #ifndef XATTR_DOS_ATTRIB 107 #define XATTR_DOS_ATTRIB "user.DOSATTRIB" 108 #endif 109 110 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */ 111 112 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses)) 113 114 /* 115 * CIFS vfs client Status information (based on what we know.) 116 */ 117 118 /* associated with each connection */ 119 enum statusEnum { 120 CifsNew = 0, 121 CifsGood, 122 CifsExiting, 123 CifsNeedReconnect, 124 CifsNeedNegotiate, 125 CifsInNegotiate, 126 }; 127 128 /* associated with each smb session */ 129 enum ses_status_enum { 130 SES_NEW = 0, 131 SES_GOOD, 132 SES_EXITING, 133 SES_NEED_RECON, 134 SES_IN_SETUP 135 }; 136 137 /* associated with each tree connection to the server */ 138 enum tid_status_enum { 139 TID_NEW = 0, 140 TID_GOOD, 141 TID_EXITING, 142 TID_NEED_RECON, 143 TID_NEED_TCON, 144 TID_IN_TCON, 145 TID_NEED_FILES_INVALIDATE, /* currently unused */ 146 TID_IN_FILES_INVALIDATE 147 }; 148 149 enum securityEnum { 150 Unspecified = 0, /* not specified */ 151 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */ 152 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */ 153 Kerberos, /* Kerberos via SPNEGO */ 154 }; 155 156 enum cifs_reparse_type { 157 CIFS_REPARSE_TYPE_NFS, 158 CIFS_REPARSE_TYPE_WSL, 159 CIFS_REPARSE_TYPE_DEFAULT = CIFS_REPARSE_TYPE_NFS, 160 }; 161 162 static inline const char *cifs_reparse_type_str(enum cifs_reparse_type type) 163 { 164 switch (type) { 165 case CIFS_REPARSE_TYPE_NFS: 166 return "nfs"; 167 case CIFS_REPARSE_TYPE_WSL: 168 return "wsl"; 169 default: 170 return "unknown"; 171 } 172 } 173 174 struct session_key { 175 unsigned int len; 176 char *response; 177 }; 178 179 /* crypto hashing related structure/fields, not specific to a sec mech */ 180 struct cifs_secmech { 181 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 182 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 183 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 184 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 185 186 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 187 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 188 }; 189 190 /* per smb session structure/fields */ 191 struct ntlmssp_auth { 192 bool sesskey_per_smbsess; /* whether session key is per smb session */ 193 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 194 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 195 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 196 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 197 }; 198 199 struct cifs_cred { 200 int uid; 201 int gid; 202 int mode; 203 int cecount; 204 struct smb_sid osid; 205 struct smb_sid gsid; 206 struct cifs_ntace *ntaces; 207 struct smb_ace *aces; 208 }; 209 210 struct cifs_open_info_data { 211 bool adjust_tz; 212 union { 213 bool reparse_point; 214 bool symlink; 215 }; 216 struct { 217 /* ioctl response buffer */ 218 struct { 219 int buftype; 220 struct kvec iov; 221 } io; 222 __u32 tag; 223 union { 224 struct reparse_data_buffer *buf; 225 struct reparse_posix_data *posix; 226 }; 227 } reparse; 228 struct { 229 __u8 eas[SMB2_WSL_MAX_QUERY_EA_RESP_SIZE]; 230 unsigned int eas_len; 231 } wsl; 232 char *symlink_target; 233 struct smb_sid posix_owner; 234 struct smb_sid posix_group; 235 union { 236 struct smb2_file_all_info fi; 237 struct smb311_posix_qinfo posix_fi; 238 }; 239 }; 240 241 /* 242 ***************************************************************** 243 * Except the CIFS PDUs themselves all the 244 * globally interesting structs should go here 245 ***************************************************************** 246 */ 247 248 /* 249 * A smb_rqst represents a complete request to be issued to a server. It's 250 * formed by a kvec array, followed by an array of pages. Page data is assumed 251 * to start at the beginning of the first page. 252 */ 253 struct smb_rqst { 254 struct kvec *rq_iov; /* array of kvecs */ 255 unsigned int rq_nvec; /* number of kvecs in array */ 256 struct iov_iter rq_iter; /* Data iterator */ 257 struct folio_queue *rq_buffer; /* Buffer for encryption */ 258 }; 259 260 struct mid_q_entry; 261 struct TCP_Server_Info; 262 struct cifsFileInfo; 263 struct cifs_ses; 264 struct cifs_tcon; 265 struct dfs_info3_param; 266 struct cifs_fattr; 267 struct smb3_fs_context; 268 struct cifs_fid; 269 struct cifs_io_subrequest; 270 struct cifs_io_parms; 271 struct cifs_search_info; 272 struct cifsInodeInfo; 273 struct cifs_open_parms; 274 struct cifs_credits; 275 276 struct smb_version_operations { 277 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 278 struct mid_q_entry *); 279 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 280 /* setup request: allocate mid, sign message */ 281 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 282 struct TCP_Server_Info *, 283 struct smb_rqst *); 284 /* setup async request: allocate mid, sign message */ 285 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 286 struct smb_rqst *); 287 /* check response: verify signature, map error */ 288 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 289 bool); 290 void (*add_credits)(struct TCP_Server_Info *server, 291 struct cifs_credits *credits, 292 const int optype); 293 void (*set_credits)(struct TCP_Server_Info *, const int); 294 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 295 unsigned int (*get_credits)(struct mid_q_entry *); 296 __u64 (*get_next_mid)(struct TCP_Server_Info *); 297 void (*revert_current_mid)(struct TCP_Server_Info *server, 298 const unsigned int val); 299 /* data offset from read response message */ 300 unsigned int (*read_data_offset)(char *); 301 /* 302 * Data length from read response message 303 * When in_remaining is true, the returned data length is in 304 * message field DataRemaining for out-of-band data read (e.g through 305 * Memory Registration RDMA write in SMBD). 306 * Otherwise, the returned data length is in message field DataLength. 307 */ 308 unsigned int (*read_data_length)(char *, bool in_remaining); 309 /* map smb to linux error */ 310 int (*map_error)(char *, bool); 311 /* find mid corresponding to the response message */ 312 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 313 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 314 void (*clear_stats)(struct cifs_tcon *); 315 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 316 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 317 /* verify the message */ 318 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 319 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 320 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 321 void (*downgrade_oplock)(struct TCP_Server_Info *server, 322 struct cifsInodeInfo *cinode, __u32 oplock, 323 unsigned int epoch, bool *purge_cache); 324 /* process transaction2 response */ 325 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 326 char *, int); 327 /* check if we need to negotiate */ 328 bool (*need_neg)(struct TCP_Server_Info *); 329 /* negotiate to the server */ 330 int (*negotiate)(const unsigned int xid, 331 struct cifs_ses *ses, 332 struct TCP_Server_Info *server); 333 /* set negotiated write size */ 334 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 335 /* set negotiated read size */ 336 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 337 /* setup smb sessionn */ 338 int (*sess_setup)(const unsigned int, struct cifs_ses *, 339 struct TCP_Server_Info *server, 340 const struct nls_table *); 341 /* close smb session */ 342 int (*logoff)(const unsigned int, struct cifs_ses *); 343 /* connect to a server share */ 344 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 345 struct cifs_tcon *, const struct nls_table *); 346 /* close tree connection */ 347 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 348 /* get DFS referrals */ 349 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 350 const char *, struct dfs_info3_param **, 351 unsigned int *, const struct nls_table *, int); 352 /* informational QFS call */ 353 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 354 struct cifs_sb_info *); 355 /* query for server interfaces */ 356 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 357 bool); 358 /* check if a path is accessible or not */ 359 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 360 struct cifs_sb_info *, const char *); 361 /* query path data from the server */ 362 int (*query_path_info)(const unsigned int xid, 363 struct cifs_tcon *tcon, 364 struct cifs_sb_info *cifs_sb, 365 const char *full_path, 366 struct cifs_open_info_data *data); 367 /* query file data from the server */ 368 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 369 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 370 /* query reparse point to determine which type of special file */ 371 int (*query_reparse_point)(const unsigned int xid, 372 struct cifs_tcon *tcon, 373 struct cifs_sb_info *cifs_sb, 374 const char *full_path, 375 u32 *tag, struct kvec *rsp, 376 int *rsp_buftype); 377 /* get server index number */ 378 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 379 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 380 struct cifs_open_info_data *data); 381 /* set size by path */ 382 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 383 const char *, __u64, struct cifs_sb_info *, bool, 384 struct dentry *); 385 /* set size by file handle */ 386 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 387 struct cifsFileInfo *, __u64, bool); 388 /* set attributes */ 389 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 390 const unsigned int); 391 int (*set_compression)(const unsigned int, struct cifs_tcon *, 392 struct cifsFileInfo *); 393 /* check if we can send an echo or nor */ 394 bool (*can_echo)(struct TCP_Server_Info *); 395 /* send echo request */ 396 int (*echo)(struct TCP_Server_Info *); 397 /* create directory */ 398 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 399 umode_t mode, struct cifs_tcon *tcon, 400 const char *full_path, 401 struct cifs_sb_info *cifs_sb); 402 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 403 struct cifs_tcon *tcon, const char *name, 404 struct cifs_sb_info *sb); 405 /* set info on created directory */ 406 void (*mkdir_setinfo)(struct inode *, const char *, 407 struct cifs_sb_info *, struct cifs_tcon *, 408 const unsigned int); 409 /* remove directory */ 410 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 411 struct cifs_sb_info *); 412 /* unlink file */ 413 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 414 struct cifs_sb_info *, struct dentry *); 415 /* open, rename and delete file */ 416 int (*rename_pending_delete)(const char *, struct dentry *, 417 const unsigned int); 418 /* send rename request */ 419 int (*rename)(const unsigned int xid, 420 struct cifs_tcon *tcon, 421 struct dentry *source_dentry, 422 const char *from_name, const char *to_name, 423 struct cifs_sb_info *cifs_sb); 424 /* send create hardlink request */ 425 int (*create_hardlink)(const unsigned int xid, 426 struct cifs_tcon *tcon, 427 struct dentry *source_dentry, 428 const char *from_name, const char *to_name, 429 struct cifs_sb_info *cifs_sb); 430 /* query symlink target */ 431 int (*query_symlink)(const unsigned int xid, 432 struct cifs_tcon *tcon, 433 struct cifs_sb_info *cifs_sb, 434 const char *full_path, 435 char **target_path); 436 /* open a file for non-posix mounts */ 437 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 438 void *buf); 439 /* set fid protocol-specific info */ 440 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 441 /* close a file */ 442 int (*close)(const unsigned int, struct cifs_tcon *, 443 struct cifs_fid *); 444 /* close a file, returning file attributes and timestamps */ 445 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 446 struct cifsFileInfo *pfile_info); 447 /* send a flush request to the server */ 448 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 449 /* async read from the server */ 450 int (*async_readv)(struct cifs_io_subrequest *); 451 /* async write to the server */ 452 void (*async_writev)(struct cifs_io_subrequest *); 453 /* sync read from the server */ 454 int (*sync_read)(const unsigned int, struct cifs_fid *, 455 struct cifs_io_parms *, unsigned int *, char **, 456 int *); 457 /* sync write to the server */ 458 int (*sync_write)(const unsigned int, struct cifs_fid *, 459 struct cifs_io_parms *, unsigned int *, struct kvec *, 460 unsigned long); 461 /* open dir, start readdir */ 462 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 463 const char *, struct cifs_sb_info *, 464 struct cifs_fid *, __u16, 465 struct cifs_search_info *); 466 /* continue readdir */ 467 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 468 struct cifs_fid *, 469 __u16, struct cifs_search_info *srch_inf); 470 /* close dir */ 471 int (*close_dir)(const unsigned int, struct cifs_tcon *, 472 struct cifs_fid *); 473 /* calculate a size of SMB message */ 474 unsigned int (*calc_smb_size)(void *buf); 475 /* check for STATUS_PENDING and process the response if yes */ 476 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 477 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 478 bool (*is_session_expired)(char *); 479 /* send oplock break response */ 480 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 481 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 482 /* query remote filesystem */ 483 int (*queryfs)(const unsigned int, struct cifs_tcon *, 484 const char *, struct cifs_sb_info *, struct kstatfs *); 485 /* send mandatory brlock to the server */ 486 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 487 __u64, __u32, int, int, bool); 488 /* unlock range of mandatory locks */ 489 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 490 const unsigned int); 491 /* push brlocks from the cache to the server */ 492 int (*push_mand_locks)(struct cifsFileInfo *); 493 /* get lease key of the inode */ 494 void (*get_lease_key)(struct inode *, struct cifs_fid *); 495 /* set lease key of the inode */ 496 void (*set_lease_key)(struct inode *, struct cifs_fid *); 497 /* generate new lease key */ 498 void (*new_lease_key)(struct cifs_fid *); 499 int (*generate_signingkey)(struct cifs_ses *ses, 500 struct TCP_Server_Info *server); 501 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 502 bool allocate_crypto); 503 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 504 struct cifsFileInfo *src_file); 505 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 506 struct cifsFileInfo *src_file, void __user *); 507 int (*notify)(const unsigned int xid, struct file *pfile, 508 void __user *pbuf, bool return_changes); 509 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 510 struct cifs_sb_info *, const unsigned char *, 511 char *, unsigned int *); 512 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 513 struct cifs_sb_info *, const unsigned char *, 514 char *, unsigned int *); 515 /* if we can do cache read operations */ 516 bool (*is_read_op)(__u32); 517 /* set oplock level for the inode */ 518 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 519 bool *); 520 /* create lease context buffer for CREATE request */ 521 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 522 /* parse lease context buffer and return oplock/epoch info */ 523 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 524 ssize_t (*copychunk_range)(const unsigned int, 525 struct cifsFileInfo *src_file, 526 struct cifsFileInfo *target_file, 527 u64 src_off, u64 len, u64 dest_off); 528 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 529 struct cifsFileInfo *target_file, u64 src_off, u64 len, 530 u64 dest_off); 531 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 532 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 533 const unsigned char *, const unsigned char *, char *, 534 size_t, struct cifs_sb_info *); 535 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 536 const char *, const void *, const __u16, 537 const struct nls_table *, struct cifs_sb_info *); 538 struct smb_ntsd * (*get_acl)(struct cifs_sb_info *cifssb, struct inode *ino, 539 const char *patch, u32 *plen, u32 info); 540 struct smb_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *cifssmb, 541 const struct cifs_fid *pfid, u32 *plen, u32 info); 542 int (*set_acl)(struct smb_ntsd *pntsd, __u32 len, struct inode *ino, const char *path, 543 int flag); 544 /* writepages retry size */ 545 unsigned int (*wp_retry_size)(struct inode *); 546 /* get mtu credits */ 547 int (*wait_mtu_credits)(struct TCP_Server_Info *, size_t, 548 size_t *, struct cifs_credits *); 549 /* adjust previously taken mtu credits to request size */ 550 int (*adjust_credits)(struct TCP_Server_Info *server, 551 struct cifs_io_subrequest *subreq, 552 unsigned int /*enum smb3_rw_credits_trace*/ trace); 553 /* check if we need to issue closedir */ 554 bool (*dir_needs_close)(struct cifsFileInfo *); 555 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 556 loff_t); 557 /* init transform (compress/encrypt) request */ 558 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 559 struct smb_rqst *, struct smb_rqst *); 560 int (*is_transform_hdr)(void *buf); 561 int (*receive_transform)(struct TCP_Server_Info *, 562 struct mid_q_entry **, char **, int *); 563 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 564 enum securityEnum); 565 int (*next_header)(struct TCP_Server_Info *server, char *buf, 566 unsigned int *noff); 567 /* ioctl passthrough for query_info */ 568 int (*ioctl_query_info)(const unsigned int xid, 569 struct cifs_tcon *tcon, 570 struct cifs_sb_info *cifs_sb, 571 __le16 *path, int is_dir, 572 unsigned long p); 573 /* make unix special files (block, char, fifo, socket) */ 574 int (*make_node)(unsigned int xid, 575 struct inode *inode, 576 struct dentry *dentry, 577 struct cifs_tcon *tcon, 578 const char *full_path, 579 umode_t mode, 580 dev_t device_number); 581 /* version specific fiemap implementation */ 582 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 583 struct fiemap_extent_info *, u64, u64); 584 /* version specific llseek implementation */ 585 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 586 /* Check for STATUS_IO_TIMEOUT */ 587 bool (*is_status_io_timeout)(char *buf); 588 /* Check for STATUS_NETWORK_NAME_DELETED */ 589 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 590 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 591 struct kvec *rsp_iov, 592 struct cifs_open_info_data *data); 593 int (*create_reparse_symlink)(const unsigned int xid, 594 struct inode *inode, 595 struct dentry *dentry, 596 struct cifs_tcon *tcon, 597 const char *full_path, 598 const char *symname); 599 }; 600 601 struct smb_version_values { 602 char *version_string; 603 __u16 protocol_id; 604 __u32 req_capabilities; 605 __u32 large_lock_type; 606 __u32 exclusive_lock_type; 607 __u32 shared_lock_type; 608 __u32 unlock_lock_type; 609 size_t header_preamble_size; 610 size_t header_size; 611 size_t max_header_size; 612 size_t read_rsp_size; 613 __le16 lock_cmd; 614 unsigned int cap_unix; 615 unsigned int cap_nt_find; 616 unsigned int cap_large_files; 617 __u16 signing_enabled; 618 __u16 signing_required; 619 size_t create_lease_size; 620 }; 621 622 #define HEADER_SIZE(server) (server->vals->header_size) 623 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 624 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 625 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 626 627 /** 628 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 629 * trying to reuse existing superblock for a new mount 630 */ 631 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 632 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 633 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 634 CIFS_MOUNT_MAP_SFM_CHR | \ 635 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 636 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 637 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 638 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 639 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 640 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 641 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 642 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 643 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 644 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 645 646 /** 647 * Generic VFS superblock mount flags (s_flags) to consider when 648 * trying to reuse existing superblock for a new mount 649 */ 650 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 651 SB_NODEV | SB_SYNCHRONOUS) 652 653 struct cifs_mnt_data { 654 struct cifs_sb_info *cifs_sb; 655 struct smb3_fs_context *ctx; 656 int flags; 657 }; 658 659 static inline unsigned int 660 get_rfc1002_length(void *buf) 661 { 662 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 663 } 664 665 static inline void 666 inc_rfc1001_len(void *buf, int count) 667 { 668 be32_add_cpu((__be32 *)buf, count); 669 } 670 671 struct TCP_Server_Info { 672 struct list_head tcp_ses_list; 673 struct list_head smb_ses_list; 674 spinlock_t srv_lock; /* protect anything here that is not protected */ 675 __u64 conn_id; /* connection identifier (useful for debugging) */ 676 int srv_count; /* reference counter */ 677 /* 15 character server name + 0x20 16th byte indicating type = srv */ 678 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 679 struct smb_version_operations *ops; 680 struct smb_version_values *vals; 681 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 682 enum statusEnum tcpStatus; /* what we think the status is */ 683 char *hostname; /* hostname portion of UNC string */ 684 struct socket *ssocket; 685 struct sockaddr_storage dstaddr; 686 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 687 #ifdef CONFIG_NET_NS 688 struct net *net; 689 #endif 690 wait_queue_head_t response_q; 691 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 692 spinlock_t mid_lock; /* protect mid queue and it's entries */ 693 struct list_head pending_mid_q; 694 bool noblocksnd; /* use blocking sendmsg */ 695 bool noautotune; /* do not autotune send buf sizes */ 696 bool nosharesock; 697 bool tcp_nodelay; 698 bool terminate; 699 unsigned int credits; /* send no more requests at once */ 700 unsigned int max_credits; /* can override large 32000 default at mnt */ 701 unsigned int in_flight; /* number of requests on the wire to server */ 702 unsigned int max_in_flight; /* max number of requests that were on wire */ 703 spinlock_t req_lock; /* protect the two values above */ 704 struct mutex _srv_mutex; 705 unsigned int nofs_flag; 706 struct task_struct *tsk; 707 char server_GUID[16]; 708 __u16 sec_mode; 709 bool sign; /* is signing enabled on this connection? */ 710 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 711 bool session_estab; /* mark when very first sess is established */ 712 int echo_credits; /* echo reserved slots */ 713 int oplock_credits; /* oplock break reserved slots */ 714 bool echoes:1; /* enable echoes */ 715 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 716 u16 dialect; /* dialect index that server chose */ 717 bool oplocks:1; /* enable oplocks */ 718 unsigned int maxReq; /* Clients should submit no more */ 719 /* than maxReq distinct unanswered SMBs to the server when using */ 720 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 721 unsigned int maxBuf; /* maxBuf specifies the maximum */ 722 /* message size the server can send or receive for non-raw SMBs */ 723 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 724 /* when socket is setup (and during reconnect) before NegProt sent */ 725 unsigned int max_rw; /* maxRw specifies the maximum */ 726 /* message size the server can send or receive for */ 727 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 728 unsigned int capabilities; /* selective disabling of caps by smb sess */ 729 int timeAdj; /* Adjust for difference in server time zone in sec */ 730 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 731 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 732 /* 16th byte of RFC1001 workstation name is always null */ 733 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 734 __u32 sequence_number; /* for signing, protected by srv_mutex */ 735 __u32 reconnect_instance; /* incremented on each reconnect */ 736 struct session_key session_key; 737 unsigned long lstrp; /* when we got last response from this server */ 738 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 739 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 740 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 741 char negflavor; /* NEGOTIATE response flavor */ 742 /* extended security flavors that server supports */ 743 bool sec_ntlmssp; /* supports NTLMSSP */ 744 bool sec_kerberosu2u; /* supports U2U Kerberos */ 745 bool sec_kerberos; /* supports plain Kerberos */ 746 bool sec_mskerberos; /* supports legacy MS Kerberos */ 747 bool large_buf; /* is current buffer large? */ 748 /* use SMBD connection instead of socket */ 749 bool rdma; 750 /* point to the SMBD connection if RDMA is used instead of socket */ 751 struct smbd_connection *smbd_conn; 752 struct delayed_work echo; /* echo ping workqueue job */ 753 char *smallbuf; /* pointer to current "small" buffer */ 754 char *bigbuf; /* pointer to current "big" buffer */ 755 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 756 unsigned int pdu_size; 757 unsigned int total_read; /* total amount of data read in this pass */ 758 atomic_t in_send; /* requests trying to send */ 759 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 760 #ifdef CONFIG_CIFS_STATS2 761 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 762 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 763 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 764 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 765 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 766 #endif /* STATS2 */ 767 unsigned int max_read; 768 unsigned int max_write; 769 unsigned int min_offload; 770 unsigned int retrans; 771 struct { 772 bool requested; /* "compress" mount option set*/ 773 bool enabled; /* actually negotiated with server */ 774 __le16 alg; /* preferred alg negotiated with server */ 775 } compression; 776 __u16 signing_algorithm; 777 __le16 cipher_type; 778 /* save initial negprot hash */ 779 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 780 bool signing_negotiated; /* true if valid signing context rcvd from server */ 781 bool posix_ext_supported; 782 struct delayed_work reconnect; /* reconnect workqueue job */ 783 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 784 unsigned long echo_interval; 785 786 /* 787 * Number of targets available for reconnect. The more targets 788 * the more tasks have to wait to let the demultiplex thread 789 * reconnect. 790 */ 791 int nr_targets; 792 bool noblockcnt; /* use non-blocking connect() */ 793 794 /* 795 * If this is a session channel, 796 * primary_server holds the ref-counted 797 * pointer to primary channel connection for the session. 798 */ 799 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 800 struct TCP_Server_Info *primary_server; 801 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 802 803 #ifdef CONFIG_CIFS_SWN_UPCALL 804 bool use_swn_dstaddr; 805 struct sockaddr_storage swn_dstaddr; 806 #endif 807 struct mutex refpath_lock; /* protects leaf_fullpath */ 808 /* 809 * leaf_fullpath: Canonical DFS referral path related to this 810 * connection. 811 * It is used in DFS cache refresher, reconnect and may 812 * change due to nested DFS links. 813 * 814 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 815 * mostly used for not requiring a copy of @leaf_fullpath when getting 816 * cached or new DFS referrals (which might also sleep during I/O). 817 * While @srv_lock is held for making string and NULL comparisons against 818 * both fields as in mount(2) and cache refresh. 819 * 820 * format: \\HOST\SHARE[\OPTIONAL PATH] 821 */ 822 char *leaf_fullpath; 823 bool dfs_conn:1; 824 }; 825 826 static inline bool is_smb1(struct TCP_Server_Info *server) 827 { 828 return HEADER_PREAMBLE_SIZE(server) != 0; 829 } 830 831 static inline void cifs_server_lock(struct TCP_Server_Info *server) 832 { 833 unsigned int nofs_flag = memalloc_nofs_save(); 834 835 mutex_lock(&server->_srv_mutex); 836 server->nofs_flag = nofs_flag; 837 } 838 839 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 840 { 841 unsigned int nofs_flag = server->nofs_flag; 842 843 mutex_unlock(&server->_srv_mutex); 844 memalloc_nofs_restore(nofs_flag); 845 } 846 847 struct cifs_credits { 848 unsigned int value; 849 unsigned int instance; 850 unsigned int in_flight_check; 851 unsigned int rreq_debug_id; 852 unsigned int rreq_debug_index; 853 }; 854 855 static inline unsigned int 856 in_flight(struct TCP_Server_Info *server) 857 { 858 unsigned int num; 859 860 spin_lock(&server->req_lock); 861 num = server->in_flight; 862 spin_unlock(&server->req_lock); 863 return num; 864 } 865 866 static inline bool 867 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 868 { 869 int num; 870 871 spin_lock(&server->req_lock); 872 num = *credits; 873 spin_unlock(&server->req_lock); 874 return num >= num_credits; 875 } 876 877 static inline void 878 add_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 879 const int optype) 880 { 881 server->ops->add_credits(server, credits, optype); 882 } 883 884 static inline void 885 add_credits_and_wake_if(struct TCP_Server_Info *server, 886 struct cifs_credits *credits, const int optype) 887 { 888 if (credits->value) { 889 server->ops->add_credits(server, credits, optype); 890 wake_up(&server->request_q); 891 credits->value = 0; 892 } 893 } 894 895 static inline void 896 set_credits(struct TCP_Server_Info *server, const int val) 897 { 898 server->ops->set_credits(server, val); 899 } 900 901 static inline int 902 adjust_credits(struct TCP_Server_Info *server, struct cifs_io_subrequest *subreq, 903 unsigned int /* enum smb3_rw_credits_trace */ trace) 904 { 905 return server->ops->adjust_credits ? 906 server->ops->adjust_credits(server, subreq, trace) : 0; 907 } 908 909 static inline __le64 910 get_next_mid64(struct TCP_Server_Info *server) 911 { 912 return cpu_to_le64(server->ops->get_next_mid(server)); 913 } 914 915 static inline __le16 916 get_next_mid(struct TCP_Server_Info *server) 917 { 918 __u16 mid = server->ops->get_next_mid(server); 919 /* 920 * The value in the SMB header should be little endian for easy 921 * on-the-wire decoding. 922 */ 923 return cpu_to_le16(mid); 924 } 925 926 static inline void 927 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 928 { 929 if (server->ops->revert_current_mid) 930 server->ops->revert_current_mid(server, val); 931 } 932 933 static inline void 934 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 935 const struct smb2_hdr *shdr) 936 { 937 unsigned int num = le16_to_cpu(shdr->CreditCharge); 938 939 return revert_current_mid(server, num > 0 ? num : 1); 940 } 941 942 static inline __u16 943 get_mid(const struct smb_hdr *smb) 944 { 945 return le16_to_cpu(smb->Mid); 946 } 947 948 static inline bool 949 compare_mid(__u16 mid, const struct smb_hdr *smb) 950 { 951 return mid == le16_to_cpu(smb->Mid); 952 } 953 954 /* 955 * When the server supports very large reads and writes via POSIX extensions, 956 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 957 * including the RFC1001 length. 958 * 959 * Note that this might make for "interesting" allocation problems during 960 * writeback however as we have to allocate an array of pointers for the 961 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 962 * 963 * For reads, there is a similar problem as we need to allocate an array 964 * of kvecs to handle the receive, though that should only need to be done 965 * once. 966 */ 967 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 968 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 969 970 /* 971 * When the server doesn't allow large posix writes, only allow a rsize/wsize 972 * of 2^17-1 minus the size of the call header. That allows for a read or 973 * write up to the maximum size described by RFC1002. 974 */ 975 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 976 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 977 978 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 979 980 /* 981 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 982 * those values when posix extensions aren't in force. In actuality here, we 983 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 984 * to be ok with the extra byte even though Windows doesn't send writes that 985 * are that large. 986 * 987 * Citation: 988 * 989 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 990 */ 991 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 992 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 993 994 /* 995 * Macros to allow the TCP_Server_Info->net field and related code to drop out 996 * when CONFIG_NET_NS isn't set. 997 */ 998 999 #ifdef CONFIG_NET_NS 1000 1001 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1002 { 1003 return srv->net; 1004 } 1005 1006 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1007 { 1008 srv->net = net; 1009 } 1010 1011 #else 1012 1013 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1014 { 1015 return &init_net; 1016 } 1017 1018 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1019 { 1020 } 1021 1022 #endif 1023 1024 struct cifs_server_iface { 1025 struct list_head iface_head; 1026 struct kref refcount; 1027 size_t speed; 1028 size_t weight_fulfilled; 1029 unsigned int num_channels; 1030 unsigned int rdma_capable : 1; 1031 unsigned int rss_capable : 1; 1032 unsigned int is_active : 1; /* unset if non existent */ 1033 struct sockaddr_storage sockaddr; 1034 }; 1035 1036 /* release iface when last ref is dropped */ 1037 static inline void 1038 release_iface(struct kref *ref) 1039 { 1040 struct cifs_server_iface *iface = container_of(ref, 1041 struct cifs_server_iface, 1042 refcount); 1043 kfree(iface); 1044 } 1045 1046 struct cifs_chan { 1047 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1048 struct TCP_Server_Info *server; 1049 struct cifs_server_iface *iface; /* interface in use */ 1050 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1051 }; 1052 1053 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1054 1055 /* 1056 * Session structure. One of these for each uid session with a particular host 1057 */ 1058 struct cifs_ses { 1059 struct list_head smb_ses_list; 1060 struct list_head rlist; /* reconnect list */ 1061 struct list_head tcon_list; 1062 struct list_head dlist; /* dfs list */ 1063 struct cifs_tcon *tcon_ipc; 1064 spinlock_t ses_lock; /* protect anything here that is not protected */ 1065 struct mutex session_mutex; 1066 struct TCP_Server_Info *server; /* pointer to server info */ 1067 int ses_count; /* reference counter */ 1068 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1069 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1070 char *serverOS; /* name of operating system underlying server */ 1071 char *serverNOS; /* name of network operating system of server */ 1072 char *serverDomain; /* security realm of server */ 1073 __u64 Suid; /* remote smb uid */ 1074 kuid_t linux_uid; /* overriding owner of files on the mount */ 1075 kuid_t cred_uid; /* owner of credentials */ 1076 unsigned int capabilities; 1077 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1078 char *user_name; /* must not be null except during init of sess 1079 and after mount option parsing we fill it */ 1080 char *domainName; 1081 char *password; 1082 char *password2; /* When key rotation used, new password may be set before it expires */ 1083 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1084 struct session_key auth_key; 1085 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1086 enum securityEnum sectype; /* what security flavor was specified? */ 1087 bool sign; /* is signing required? */ 1088 bool domainAuto:1; 1089 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1090 unsigned int flags; 1091 __u16 session_flags; 1092 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1093 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1094 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1095 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1096 1097 /* 1098 * Network interfaces available on the server this session is 1099 * connected to. 1100 * 1101 * Other channels can be opened by connecting and binding this 1102 * session to interfaces from this list. 1103 * 1104 * iface_lock should be taken when accessing any of these fields 1105 */ 1106 spinlock_t iface_lock; 1107 /* ========= begin: protected by iface_lock ======== */ 1108 struct list_head iface_list; 1109 size_t iface_count; 1110 unsigned long iface_last_update; /* jiffies */ 1111 /* ========= end: protected by iface_lock ======== */ 1112 1113 spinlock_t chan_lock; 1114 /* ========= begin: protected by chan_lock ======== */ 1115 #define CIFS_MAX_CHANNELS 16 1116 #define CIFS_INVAL_CHAN_INDEX (-1) 1117 #define CIFS_ALL_CHANNELS_SET(ses) \ 1118 ((1UL << (ses)->chan_count) - 1) 1119 #define CIFS_ALL_CHANS_GOOD(ses) \ 1120 (!(ses)->chans_need_reconnect) 1121 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1122 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1123 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1124 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1125 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1126 test_bit((index), &(ses)->chans_need_reconnect) 1127 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1128 ((ses)->chans[(index)].in_reconnect) 1129 1130 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1131 size_t chan_count; 1132 size_t chan_max; 1133 atomic_t chan_seq; /* round robin state */ 1134 1135 /* 1136 * chans_need_reconnect is a bitmap indicating which of the channels 1137 * under this smb session needs to be reconnected. 1138 * If not multichannel session, only one bit will be used. 1139 * 1140 * We will ask for sess and tcon reconnection only if all the 1141 * channels are marked for needing reconnection. This will 1142 * enable the sessions on top to continue to live till any 1143 * of the channels below are active. 1144 */ 1145 unsigned long chans_need_reconnect; 1146 /* ========= end: protected by chan_lock ======== */ 1147 struct cifs_ses *dfs_root_ses; 1148 struct nls_table *local_nls; 1149 }; 1150 1151 static inline bool 1152 cap_unix(struct cifs_ses *ses) 1153 { 1154 return ses->server->vals->cap_unix & ses->capabilities; 1155 } 1156 1157 /* 1158 * common struct for holding inode info when searching for or updating an 1159 * inode with new info 1160 */ 1161 1162 #define CIFS_FATTR_JUNCTION 0x1 1163 #define CIFS_FATTR_DELETE_PENDING 0x2 1164 #define CIFS_FATTR_NEED_REVAL 0x4 1165 #define CIFS_FATTR_INO_COLLISION 0x8 1166 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1167 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1168 1169 struct cifs_fattr { 1170 u32 cf_flags; 1171 u32 cf_cifsattrs; 1172 u64 cf_uniqueid; 1173 u64 cf_eof; 1174 u64 cf_bytes; 1175 u64 cf_createtime; 1176 kuid_t cf_uid; 1177 kgid_t cf_gid; 1178 umode_t cf_mode; 1179 dev_t cf_rdev; 1180 unsigned int cf_nlink; 1181 unsigned int cf_dtype; 1182 struct timespec64 cf_atime; 1183 struct timespec64 cf_mtime; 1184 struct timespec64 cf_ctime; 1185 u32 cf_cifstag; 1186 char *cf_symlink_target; 1187 }; 1188 1189 /* 1190 * there is one of these for each connection to a resource on a particular 1191 * session 1192 */ 1193 struct cifs_tcon { 1194 struct list_head tcon_list; 1195 int debug_id; /* Debugging for tracing */ 1196 int tc_count; 1197 struct list_head rlist; /* reconnect list */ 1198 spinlock_t tc_lock; /* protect anything here that is not protected */ 1199 atomic_t num_local_opens; /* num of all opens including disconnected */ 1200 atomic_t num_remote_opens; /* num of all network opens on server */ 1201 struct list_head openFileList; 1202 spinlock_t open_file_lock; /* protects list above */ 1203 struct cifs_ses *ses; /* pointer to session associated with */ 1204 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1205 char *nativeFileSystem; 1206 char *password; /* for share-level security */ 1207 __u32 tid; /* The 4 byte tree id */ 1208 __u16 Flags; /* optional support bits */ 1209 enum tid_status_enum status; 1210 atomic_t num_smbs_sent; 1211 union { 1212 struct { 1213 atomic_t num_writes; 1214 atomic_t num_reads; 1215 atomic_t num_flushes; 1216 atomic_t num_oplock_brks; 1217 atomic_t num_opens; 1218 atomic_t num_closes; 1219 atomic_t num_deletes; 1220 atomic_t num_mkdirs; 1221 atomic_t num_posixopens; 1222 atomic_t num_posixmkdirs; 1223 atomic_t num_rmdirs; 1224 atomic_t num_renames; 1225 atomic_t num_t2renames; 1226 atomic_t num_ffirst; 1227 atomic_t num_fnext; 1228 atomic_t num_fclose; 1229 atomic_t num_hardlinks; 1230 atomic_t num_symlinks; 1231 atomic_t num_locks; 1232 atomic_t num_acl_get; 1233 atomic_t num_acl_set; 1234 } cifs_stats; 1235 struct { 1236 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1237 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1238 } smb2_stats; 1239 } stats; 1240 __u64 bytes_read; 1241 __u64 bytes_written; 1242 spinlock_t stat_lock; /* protects the two fields above */ 1243 time64_t stats_from_time; 1244 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1245 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1246 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1247 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1248 bool pipe:1; /* set if connection to pipe share */ 1249 bool print:1; /* set if connection to printer share */ 1250 bool retry:1; 1251 bool nocase:1; 1252 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1253 bool nodelete:1; 1254 bool seal:1; /* transport encryption for this mounted share */ 1255 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1256 for this mount even if server would support */ 1257 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1258 bool local_lease:1; /* check leases (only) on local system not remote */ 1259 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1260 bool broken_sparse_sup; /* if server or share does not support sparse */ 1261 bool need_reconnect:1; /* connection reset, tid now invalid */ 1262 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1263 bool use_resilient:1; /* use resilient instead of durable handles */ 1264 bool use_persistent:1; /* use persistent instead of durable handles */ 1265 bool no_lease:1; /* Do not request leases on files or directories */ 1266 bool use_witness:1; /* use witness protocol */ 1267 __le32 capabilities; 1268 __u32 share_flags; 1269 __u32 maximal_access; 1270 __u32 vol_serial_number; 1271 __le64 vol_create_time; 1272 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1273 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1274 __u32 ss_flags; /* sector size flags */ 1275 __u32 perf_sector_size; /* best sector size for perf */ 1276 __u32 max_chunks; 1277 __u32 max_bytes_chunk; 1278 __u32 max_bytes_copy; 1279 __u32 max_cached_dirs; 1280 #ifdef CONFIG_CIFS_FSCACHE 1281 u64 resource_id; /* server resource id */ 1282 bool fscache_acquired; /* T if we've tried acquiring a cookie */ 1283 struct fscache_volume *fscache; /* cookie for share */ 1284 struct mutex fscache_lock; /* Prevent regetting a cookie */ 1285 #endif 1286 struct list_head pending_opens; /* list of incomplete opens */ 1287 struct cached_fids *cfids; 1288 /* BB add field for back pointer to sb struct(s)? */ 1289 #ifdef CONFIG_CIFS_DFS_UPCALL 1290 struct delayed_work dfs_cache_work; 1291 struct list_head dfs_ses_list; 1292 #endif 1293 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1294 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1295 }; 1296 1297 /* 1298 * This is a refcounted and timestamped container for a tcon pointer. The 1299 * container holds a tcon reference. It is considered safe to free one of 1300 * these when the tl_count goes to 0. The tl_time is the time of the last 1301 * "get" on the container. 1302 */ 1303 struct tcon_link { 1304 struct rb_node tl_rbnode; 1305 kuid_t tl_uid; 1306 unsigned long tl_flags; 1307 #define TCON_LINK_MASTER 0 1308 #define TCON_LINK_PENDING 1 1309 #define TCON_LINK_IN_TREE 2 1310 unsigned long tl_time; 1311 atomic_t tl_count; 1312 struct cifs_tcon *tl_tcon; 1313 }; 1314 1315 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1316 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1317 1318 static inline struct cifs_tcon * 1319 tlink_tcon(struct tcon_link *tlink) 1320 { 1321 return tlink->tl_tcon; 1322 } 1323 1324 static inline struct tcon_link * 1325 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1326 { 1327 return cifs_sb->master_tlink; 1328 } 1329 1330 extern void cifs_put_tlink(struct tcon_link *tlink); 1331 1332 static inline struct tcon_link * 1333 cifs_get_tlink(struct tcon_link *tlink) 1334 { 1335 if (tlink && !IS_ERR(tlink)) 1336 atomic_inc(&tlink->tl_count); 1337 return tlink; 1338 } 1339 1340 /* This function is always expected to succeed */ 1341 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1342 1343 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1344 1345 struct cifs_pending_open { 1346 struct list_head olist; 1347 struct tcon_link *tlink; 1348 __u8 lease_key[16]; 1349 __u32 oplock; 1350 }; 1351 1352 struct cifs_deferred_close { 1353 struct list_head dlist; 1354 struct tcon_link *tlink; 1355 __u16 netfid; 1356 __u64 persistent_fid; 1357 __u64 volatile_fid; 1358 }; 1359 1360 /* 1361 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1362 * This is used to track byte stream locks on the file 1363 */ 1364 struct cifsLockInfo { 1365 struct list_head llist; /* pointer to next cifsLockInfo */ 1366 struct list_head blist; /* pointer to locks blocked on this */ 1367 wait_queue_head_t block_q; 1368 __u64 offset; 1369 __u64 length; 1370 __u32 pid; 1371 __u16 type; 1372 __u16 flags; 1373 }; 1374 1375 /* 1376 * One of these for each open instance of a file 1377 */ 1378 struct cifs_search_info { 1379 loff_t index_of_last_entry; 1380 __u16 entries_in_buffer; 1381 __u16 info_level; 1382 __u32 resume_key; 1383 char *ntwrk_buf_start; 1384 char *srch_entries_start; 1385 char *last_entry; 1386 const char *presume_name; 1387 unsigned int resume_name_len; 1388 bool endOfSearch:1; 1389 bool emptyDir:1; 1390 bool unicode:1; 1391 bool smallBuf:1; /* so we know which buf_release function to call */ 1392 }; 1393 1394 #define ACL_NO_MODE ((umode_t)(-1)) 1395 struct cifs_open_parms { 1396 struct cifs_tcon *tcon; 1397 struct cifs_sb_info *cifs_sb; 1398 int disposition; 1399 int desired_access; 1400 int create_options; 1401 const char *path; 1402 struct cifs_fid *fid; 1403 umode_t mode; 1404 bool reconnect:1; 1405 bool replay:1; /* indicates that this open is for a replay */ 1406 struct kvec *ea_cctx; 1407 }; 1408 1409 struct cifs_fid { 1410 __u16 netfid; 1411 __u64 persistent_fid; /* persist file id for smb2 */ 1412 __u64 volatile_fid; /* volatile file id for smb2 */ 1413 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1414 __u8 create_guid[16]; 1415 __u32 access; 1416 struct cifs_pending_open *pending_open; 1417 unsigned int epoch; 1418 #ifdef CONFIG_CIFS_DEBUG2 1419 __u64 mid; 1420 #endif /* CIFS_DEBUG2 */ 1421 bool purge_cache; 1422 }; 1423 1424 struct cifs_fid_locks { 1425 struct list_head llist; 1426 struct cifsFileInfo *cfile; /* fid that owns locks */ 1427 struct list_head locks; /* locks held by fid above */ 1428 }; 1429 1430 struct cifsFileInfo { 1431 /* following two lists are protected by tcon->open_file_lock */ 1432 struct list_head tlist; /* pointer to next fid owned by tcon */ 1433 struct list_head flist; /* next fid (file instance) for this inode */ 1434 /* lock list below protected by cifsi->lock_sem */ 1435 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1436 kuid_t uid; /* allows finding which FileInfo structure */ 1437 __u32 pid; /* process id who opened file */ 1438 struct cifs_fid fid; /* file id from remote */ 1439 struct list_head rlist; /* reconnect list */ 1440 /* BB add lock scope info here if needed */ 1441 /* lock scope id (0 if none) */ 1442 struct dentry *dentry; 1443 struct tcon_link *tlink; 1444 unsigned int f_flags; 1445 bool invalidHandle:1; /* file closed via session abend */ 1446 bool swapfile:1; 1447 bool oplock_break_cancelled:1; 1448 bool status_file_deleted:1; /* file has been deleted */ 1449 bool offload:1; /* offload final part of _put to a wq */ 1450 unsigned int oplock_epoch; /* epoch from the lease break */ 1451 __u32 oplock_level; /* oplock/lease level from the lease break */ 1452 int count; 1453 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1454 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1455 struct cifs_search_info srch_inf; 1456 struct work_struct oplock_break; /* work for oplock breaks */ 1457 struct work_struct put; /* work for the final part of _put */ 1458 struct work_struct serverclose; /* work for serverclose */ 1459 struct delayed_work deferred; 1460 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1461 char *symlink_target; 1462 }; 1463 1464 struct cifs_io_parms { 1465 __u16 netfid; 1466 __u64 persistent_fid; /* persist file id for smb2 */ 1467 __u64 volatile_fid; /* volatile file id for smb2 */ 1468 __u32 pid; 1469 __u64 offset; 1470 unsigned int length; 1471 struct cifs_tcon *tcon; 1472 struct TCP_Server_Info *server; 1473 }; 1474 1475 struct cifs_io_request { 1476 struct netfs_io_request rreq; 1477 struct cifsFileInfo *cfile; 1478 struct TCP_Server_Info *server; 1479 pid_t pid; 1480 }; 1481 1482 /* asynchronous read support */ 1483 struct cifs_io_subrequest { 1484 union { 1485 struct netfs_io_subrequest subreq; 1486 struct netfs_io_request *rreq; 1487 struct cifs_io_request *req; 1488 }; 1489 ssize_t got_bytes; 1490 unsigned int xid; 1491 int result; 1492 bool have_xid; 1493 bool replay; 1494 struct kvec iov[2]; 1495 struct TCP_Server_Info *server; 1496 #ifdef CONFIG_CIFS_SMB_DIRECT 1497 struct smbd_mr *mr; 1498 #endif 1499 struct cifs_credits credits; 1500 }; 1501 1502 /* 1503 * Take a reference on the file private data. Must be called with 1504 * cfile->file_info_lock held. 1505 */ 1506 static inline void 1507 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1508 { 1509 ++cifs_file->count; 1510 } 1511 1512 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1513 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1514 bool offload); 1515 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1516 1517 #define CIFS_CACHE_READ_FLG 1 1518 #define CIFS_CACHE_HANDLE_FLG 2 1519 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1520 #define CIFS_CACHE_WRITE_FLG 4 1521 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1522 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1523 1524 #define CIFS_CACHE_READ(cinode) ((cinode->oplock & CIFS_CACHE_READ_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE)) 1525 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1526 #define CIFS_CACHE_WRITE(cinode) ((cinode->oplock & CIFS_CACHE_WRITE_FLG) || (CIFS_SB(cinode->netfs.inode.i_sb)->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)) 1527 1528 /* 1529 * One of these for each file inode 1530 */ 1531 1532 struct cifsInodeInfo { 1533 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1534 bool can_cache_brlcks; 1535 struct list_head llist; /* locks helb by this inode */ 1536 /* 1537 * NOTE: Some code paths call down_read(lock_sem) twice, so 1538 * we must always use cifs_down_write() instead of down_write() 1539 * for this semaphore to avoid deadlocks. 1540 */ 1541 struct rw_semaphore lock_sem; /* protect the fields above */ 1542 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1543 struct list_head openFileList; 1544 spinlock_t open_file_lock; /* protects openFileList */ 1545 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1546 unsigned int oplock; /* oplock/lease level we have */ 1547 unsigned int epoch; /* used to track lease state changes */ 1548 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1549 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1550 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1551 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1552 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1553 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1554 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1555 unsigned long flags; 1556 spinlock_t writers_lock; 1557 unsigned int writers; /* Number of writers on this inode */ 1558 unsigned long time; /* jiffies of last update of inode */ 1559 u64 uniqueid; /* server inode number */ 1560 u64 createtime; /* creation time on server */ 1561 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1562 struct list_head deferred_closes; /* list of deferred closes */ 1563 spinlock_t deferred_lock; /* protection on deferred list */ 1564 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1565 char *symlink_target; 1566 __u32 reparse_tag; 1567 }; 1568 1569 static inline struct cifsInodeInfo * 1570 CIFS_I(struct inode *inode) 1571 { 1572 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1573 } 1574 1575 static inline struct cifs_sb_info * 1576 CIFS_SB(struct super_block *sb) 1577 { 1578 return sb->s_fs_info; 1579 } 1580 1581 static inline struct cifs_sb_info * 1582 CIFS_FILE_SB(struct file *file) 1583 { 1584 return CIFS_SB(file_inode(file)->i_sb); 1585 } 1586 1587 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1588 { 1589 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1590 return '/'; 1591 else 1592 return '\\'; 1593 } 1594 1595 static inline void 1596 convert_delimiter(char *path, char delim) 1597 { 1598 char old_delim, *pos; 1599 1600 if (delim == '/') 1601 old_delim = '\\'; 1602 else 1603 old_delim = '/'; 1604 1605 pos = path; 1606 while ((pos = strchr(pos, old_delim))) 1607 *pos = delim; 1608 } 1609 1610 #define cifs_stats_inc atomic_inc 1611 1612 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1613 unsigned int bytes) 1614 { 1615 if (bytes) { 1616 spin_lock(&tcon->stat_lock); 1617 tcon->bytes_written += bytes; 1618 spin_unlock(&tcon->stat_lock); 1619 } 1620 } 1621 1622 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1623 unsigned int bytes) 1624 { 1625 spin_lock(&tcon->stat_lock); 1626 tcon->bytes_read += bytes; 1627 spin_unlock(&tcon->stat_lock); 1628 } 1629 1630 1631 /* 1632 * This is the prototype for the mid receive function. This function is for 1633 * receiving the rest of the SMB frame, starting with the WordCount (which is 1634 * just after the MID in struct smb_hdr). Note: 1635 * 1636 * - This will be called by cifsd, with no locks held. 1637 * - The mid will still be on the pending_mid_q. 1638 * - mid->resp_buf will point to the current buffer. 1639 * 1640 * Returns zero on a successful receive, or an error. The receive state in 1641 * the TCP_Server_Info will also be updated. 1642 */ 1643 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1644 struct mid_q_entry *mid); 1645 1646 /* 1647 * This is the prototype for the mid callback function. This is called once the 1648 * mid has been received off of the socket. When creating one, take special 1649 * care to avoid deadlocks. Things to bear in mind: 1650 * 1651 * - it will be called by cifsd, with no locks held 1652 * - the mid will be removed from any lists 1653 */ 1654 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1655 1656 /* 1657 * This is the protopyte for mid handle function. This is called once the mid 1658 * has been recognized after decryption of the message. 1659 */ 1660 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1661 struct mid_q_entry *mid); 1662 1663 /* one of these for every pending CIFS request to the server */ 1664 struct mid_q_entry { 1665 struct list_head qhead; /* mids waiting on reply from this server */ 1666 struct kref refcount; 1667 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1668 __u64 mid; /* multiplex id */ 1669 __u16 credits; /* number of credits consumed by this mid */ 1670 __u16 credits_received; /* number of credits from the response */ 1671 __u32 pid; /* process id */ 1672 __u32 sequence_number; /* for CIFS signing */ 1673 unsigned long when_alloc; /* when mid was created */ 1674 #ifdef CONFIG_CIFS_STATS2 1675 unsigned long when_sent; /* time when smb send finished */ 1676 unsigned long when_received; /* when demux complete (taken off wire) */ 1677 #endif 1678 mid_receive_t *receive; /* call receive callback */ 1679 mid_callback_t *callback; /* call completion callback */ 1680 mid_handle_t *handle; /* call handle mid callback */ 1681 void *callback_data; /* general purpose pointer for callback */ 1682 struct task_struct *creator; 1683 void *resp_buf; /* pointer to received SMB header */ 1684 unsigned int resp_buf_size; 1685 int mid_state; /* wish this were enum but can not pass to wait_event */ 1686 unsigned int mid_flags; 1687 __le16 command; /* smb command code */ 1688 unsigned int optype; /* operation type */ 1689 bool large_buf:1; /* if valid response, is pointer to large buf */ 1690 bool multiRsp:1; /* multiple trans2 responses for one request */ 1691 bool multiEnd:1; /* both received */ 1692 bool decrypted:1; /* decrypted entry */ 1693 }; 1694 1695 struct close_cancelled_open { 1696 struct cifs_fid fid; 1697 struct cifs_tcon *tcon; 1698 struct work_struct work; 1699 __u64 mid; 1700 __u16 cmd; 1701 }; 1702 1703 /* Make code in transport.c a little cleaner by moving 1704 update of optional stats into function below */ 1705 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1706 { 1707 atomic_inc(&server->in_send); 1708 } 1709 1710 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1711 { 1712 atomic_dec(&server->in_send); 1713 } 1714 1715 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1716 { 1717 atomic_inc(&server->num_waiters); 1718 } 1719 1720 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1721 { 1722 atomic_dec(&server->num_waiters); 1723 } 1724 1725 #ifdef CONFIG_CIFS_STATS2 1726 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1727 { 1728 mid->when_sent = jiffies; 1729 } 1730 #else 1731 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1732 { 1733 } 1734 #endif 1735 1736 /* for pending dnotify requests */ 1737 struct dir_notify_req { 1738 struct list_head lhead; 1739 __le16 Pid; 1740 __le16 PidHigh; 1741 __u16 Mid; 1742 __u16 Tid; 1743 __u16 Uid; 1744 __u16 netfid; 1745 __u32 filter; /* CompletionFilter (for multishot) */ 1746 int multishot; 1747 struct file *pfile; 1748 }; 1749 1750 struct dfs_info3_param { 1751 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1752 int path_consumed; 1753 int server_type; 1754 int ref_flag; 1755 char *path_name; 1756 char *node_name; 1757 int ttl; 1758 }; 1759 1760 struct file_list { 1761 struct list_head list; 1762 struct cifsFileInfo *cfile; 1763 }; 1764 1765 struct cifs_mount_ctx { 1766 struct cifs_sb_info *cifs_sb; 1767 struct smb3_fs_context *fs_ctx; 1768 unsigned int xid; 1769 struct TCP_Server_Info *server; 1770 struct cifs_ses *ses; 1771 struct cifs_tcon *tcon; 1772 }; 1773 1774 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1775 { 1776 kfree(param->path_name); 1777 kfree(param->node_name); 1778 } 1779 1780 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1781 { 1782 if (param) 1783 __free_dfs_info_param(param); 1784 } 1785 1786 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1787 { 1788 if (param) { 1789 __free_dfs_info_param(param); 1790 memset(param, 0, sizeof(*param)); 1791 } 1792 } 1793 1794 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1795 int number_of_items) 1796 { 1797 int i; 1798 1799 if ((number_of_items == 0) || (param == NULL)) 1800 return; 1801 for (i = 0; i < number_of_items; i++) { 1802 kfree(param[i].path_name); 1803 kfree(param[i].node_name); 1804 } 1805 kfree(param); 1806 } 1807 1808 static inline bool is_interrupt_error(int error) 1809 { 1810 switch (error) { 1811 case -EINTR: 1812 case -ERESTARTSYS: 1813 case -ERESTARTNOHAND: 1814 case -ERESTARTNOINTR: 1815 return true; 1816 } 1817 return false; 1818 } 1819 1820 static inline bool is_retryable_error(int error) 1821 { 1822 if (is_interrupt_error(error) || error == -EAGAIN) 1823 return true; 1824 return false; 1825 } 1826 1827 static inline bool is_replayable_error(int error) 1828 { 1829 if (error == -EAGAIN || error == -ECONNABORTED) 1830 return true; 1831 return false; 1832 } 1833 1834 1835 /* cifs_get_writable_file() flags */ 1836 #define FIND_WR_ANY 0 1837 #define FIND_WR_FSUID_ONLY 1 1838 #define FIND_WR_WITH_DELETE 2 1839 1840 #define MID_FREE 0 1841 #define MID_REQUEST_ALLOCATED 1 1842 #define MID_REQUEST_SUBMITTED 2 1843 #define MID_RESPONSE_RECEIVED 4 1844 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1845 #define MID_RESPONSE_MALFORMED 0x10 1846 #define MID_SHUTDOWN 0x20 1847 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1848 1849 /* Flags */ 1850 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1851 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1852 1853 /* Types of response buffer returned from SendReceive2 */ 1854 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1855 #define CIFS_SMALL_BUFFER 1 1856 #define CIFS_LARGE_BUFFER 2 1857 #define CIFS_IOVEC 4 /* array of response buffers */ 1858 1859 /* Type of Request to SendReceive2 */ 1860 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1861 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1862 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1863 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1864 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1865 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1866 1867 /* Type of request operation */ 1868 #define CIFS_ECHO_OP 0x080 /* echo request */ 1869 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1870 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1871 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1872 /* Lower bitmask values are reserved by others below. */ 1873 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1874 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1875 1876 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1877 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1878 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1879 #define CIFS_COMPRESS_REQ 0x4000 /* compress request before sending */ 1880 1881 /* Security Flags: indicate type of session setup needed */ 1882 #define CIFSSEC_MAY_SIGN 0x00001 1883 #define CIFSSEC_MAY_NTLMV2 0x00004 1884 #define CIFSSEC_MAY_KRB5 0x00008 1885 #define CIFSSEC_MAY_SEAL 0x00040 1886 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1887 1888 #define CIFSSEC_MUST_SIGN 0x01001 1889 /* note that only one of the following can be set so the 1890 result of setting MUST flags more than once will be to 1891 require use of the stronger protocol */ 1892 #define CIFSSEC_MUST_NTLMV2 0x04004 1893 #define CIFSSEC_MUST_KRB5 0x08008 1894 #ifdef CONFIG_CIFS_UPCALL 1895 #define CIFSSEC_MASK 0xCF0CF /* flags supported if no weak allowed */ 1896 #else 1897 #define CIFSSEC_MASK 0xC70C7 /* flags supported if no weak allowed */ 1898 #endif /* UPCALL */ 1899 #define CIFSSEC_MUST_SEAL 0x40040 1900 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1901 1902 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP | CIFSSEC_MAY_SEAL) 1903 #define CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL) 1904 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1905 /* 1906 ***************************************************************** 1907 * All constants go here 1908 ***************************************************************** 1909 */ 1910 1911 #define UID_HASH (16) 1912 1913 /* 1914 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1915 * following to be declared. 1916 */ 1917 1918 /**************************************************************************** 1919 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1920 * to the locking order. i.e. if two locks are to be held together, the lock that 1921 * appears higher in this list needs to be taken before the other. 1922 * 1923 * If you hold a lock that is lower in this list, and you need to take a higher lock 1924 * (or if you think that one of the functions that you're calling may need to), first 1925 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1926 * ensure that locks are picked up only in one direction in the below table 1927 * (top to bottom). 1928 * 1929 * Also, if you expect a function to be called with a lock held, explicitly document 1930 * this in the comments on top of your function definition. 1931 * 1932 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1933 * possible. Blocking / calling other functions with a lock held always increase 1934 * the risk of a possible deadlock. 1935 * 1936 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1937 * debug. Also, any new lock that you introduce, please add to this list in the correct 1938 * order. 1939 * 1940 * Please populate this list whenever you introduce new locks in your changes. Or in 1941 * case I've missed some existing locks. Please ensure that it's added in the list 1942 * based on the locking order expected. 1943 * 1944 * ===================================================================================== 1945 * Lock Protects Initialization fn 1946 * ===================================================================================== 1947 * vol_list_lock 1948 * vol_info->ctx_lock vol_info->ctx 1949 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1950 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1951 * reconnect_mutex 1952 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1953 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1954 * cifs_tcon 1955 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1956 * cifs_tcon->pending_opens 1957 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1958 * cifs_tcon->bytes_written 1959 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1960 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1961 * GlobalCurrentXid 1962 * GlobalTotalActiveXid 1963 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1964 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1965 * ->CurrentMid 1966 * (any changes in mid_q_entry fields) 1967 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1968 * ->credits 1969 * ->echo_credits 1970 * ->oplock_credits 1971 * ->reconnect_instance 1972 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1973 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1974 * ->iface_count 1975 * ->iface_last_update 1976 * cifs_ses->chan_lock cifs_ses->chans 1977 * ->chans_need_reconnect 1978 * ->chans_in_reconnect 1979 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 1980 * inode->i_rwsem, taken by fs/netfs/locking.c e.g. should be taken before cifsInodeInfo locks 1981 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 1982 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 1983 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 1984 * ->can_cache_brlcks 1985 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 1986 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 1987 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 1988 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 1989 * ->invalidHandle initiate_cifs_search 1990 * ->oplock_break_cancelled 1991 ****************************************************************************/ 1992 1993 #ifdef DECLARE_GLOBALS_HERE 1994 #define GLOBAL_EXTERN 1995 #else 1996 #define GLOBAL_EXTERN extern 1997 #endif 1998 1999 /* 2000 * the list of TCP_Server_Info structures, ie each of the sockets 2001 * connecting our client to a distinct server (ip address), is 2002 * chained together by cifs_tcp_ses_list. The list of all our SMB 2003 * sessions (and from that the tree connections) can be found 2004 * by iterating over cifs_tcp_ses_list 2005 */ 2006 extern struct list_head cifs_tcp_ses_list; 2007 2008 /* 2009 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2010 * tcp session, and the list of tcon's per smb session. It also protects 2011 * the reference counters for the server, smb session, and tcon. 2012 * generally the locks should be taken in order tcp_ses_lock before 2013 * tcon->open_file_lock and that before file->file_info_lock since the 2014 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2015 */ 2016 extern spinlock_t cifs_tcp_ses_lock; 2017 2018 /* 2019 * Global transaction id (XID) information 2020 */ 2021 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */ 2022 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */ 2023 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */ 2024 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2025 2026 /* 2027 * Global counters, updated atomically 2028 */ 2029 extern atomic_t sesInfoAllocCount; 2030 extern atomic_t tconInfoAllocCount; 2031 extern atomic_t tcpSesNextId; 2032 extern atomic_t tcpSesAllocCount; 2033 extern atomic_t tcpSesReconnectCount; 2034 extern atomic_t tconInfoReconnectCount; 2035 2036 /* Various Debug counters */ 2037 extern atomic_t buf_alloc_count; /* current number allocated */ 2038 extern atomic_t small_buf_alloc_count; 2039 #ifdef CONFIG_CIFS_STATS2 2040 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2041 extern atomic_t total_small_buf_alloc_count; 2042 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2043 #endif 2044 2045 /* Misc globals */ 2046 extern bool enable_oplocks; /* enable or disable oplocks */ 2047 extern bool lookupCacheEnabled; 2048 extern unsigned int global_secflags; /* if on, session setup sent 2049 with more secure ntlmssp2 challenge/resp */ 2050 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2051 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2052 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2053 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2054 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2055 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2056 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2057 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2058 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2059 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2060 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2061 extern atomic_t mid_count; 2062 2063 void cifs_oplock_break(struct work_struct *work); 2064 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2065 void smb2_deferred_work_close(struct work_struct *work); 2066 2067 extern const struct slow_work_ops cifs_oplock_break_ops; 2068 extern struct workqueue_struct *cifsiod_wq; 2069 extern struct workqueue_struct *decrypt_wq; 2070 extern struct workqueue_struct *fileinfo_put_wq; 2071 extern struct workqueue_struct *cifsoplockd_wq; 2072 extern struct workqueue_struct *deferredclose_wq; 2073 extern struct workqueue_struct *serverclose_wq; 2074 extern __u32 cifs_lock_secret; 2075 2076 extern mempool_t *cifs_sm_req_poolp; 2077 extern mempool_t *cifs_req_poolp; 2078 extern mempool_t *cifs_mid_poolp; 2079 extern mempool_t cifs_io_request_pool; 2080 extern mempool_t cifs_io_subrequest_pool; 2081 2082 /* Operations for different SMB versions */ 2083 #define SMB1_VERSION_STRING "1.0" 2084 #define SMB20_VERSION_STRING "2.0" 2085 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2086 extern struct smb_version_operations smb1_operations; 2087 extern struct smb_version_values smb1_values; 2088 extern struct smb_version_operations smb20_operations; 2089 extern struct smb_version_values smb20_values; 2090 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2091 #define SMB21_VERSION_STRING "2.1" 2092 extern struct smb_version_operations smb21_operations; 2093 extern struct smb_version_values smb21_values; 2094 #define SMBDEFAULT_VERSION_STRING "default" 2095 extern struct smb_version_values smbdefault_values; 2096 #define SMB3ANY_VERSION_STRING "3" 2097 extern struct smb_version_values smb3any_values; 2098 #define SMB30_VERSION_STRING "3.0" 2099 extern struct smb_version_operations smb30_operations; 2100 extern struct smb_version_values smb30_values; 2101 #define SMB302_VERSION_STRING "3.02" 2102 #define ALT_SMB302_VERSION_STRING "3.0.2" 2103 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2104 extern struct smb_version_values smb302_values; 2105 #define SMB311_VERSION_STRING "3.1.1" 2106 #define ALT_SMB311_VERSION_STRING "3.11" 2107 extern struct smb_version_operations smb311_operations; 2108 extern struct smb_version_values smb311_values; 2109 2110 static inline char *get_security_type_str(enum securityEnum sectype) 2111 { 2112 switch (sectype) { 2113 case RawNTLMSSP: 2114 return "RawNTLMSSP"; 2115 case Kerberos: 2116 return "Kerberos"; 2117 case NTLMv2: 2118 return "NTLMv2"; 2119 default: 2120 return "Unknown"; 2121 } 2122 } 2123 2124 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2125 { 2126 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2127 } 2128 2129 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2130 { 2131 /* 2132 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2133 * Subsystem Notifies That a Share Is a DFS Share. 2134 * 2135 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2136 * Application Updates a Share. 2137 */ 2138 if (!tcon || !tcon->ses || !tcon->ses->server) 2139 return false; 2140 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2141 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2142 } 2143 2144 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2145 const struct dfs_info3_param *ref) 2146 { 2147 /* 2148 * Check if all targets are capable of handling DFS referrals as per 2149 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2150 */ 2151 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2152 } 2153 2154 static inline u64 cifs_flock_len(const struct file_lock *fl) 2155 { 2156 return (u64)fl->fl_end - fl->fl_start + 1; 2157 } 2158 2159 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2160 { 2161 if (WARN_ON_ONCE(!ses || !ses->server)) 2162 return 0; 2163 /* 2164 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2165 * servers do require it during NTLMSSP. 2166 */ 2167 if (ses->server->dialect <= SMB20_PROT_ID) 2168 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2169 return sizeof(ses->workstation_name); 2170 } 2171 2172 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2173 { 2174 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2175 dst->AccessFlags = src->AccessFlags; 2176 dst->CurrentByteOffset = src->CurrentByteOffset; 2177 dst->Mode = src->Mode; 2178 dst->AlignmentRequirement = src->AlignmentRequirement; 2179 dst->FileNameLength = src->FileNameLength; 2180 } 2181 2182 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2183 int num_rqst, 2184 const u8 *sig) 2185 { 2186 unsigned int len, skip; 2187 unsigned int nents = 0; 2188 unsigned long addr; 2189 size_t data_size; 2190 int i, j; 2191 2192 /* 2193 * The first rqst has a transform header where the first 20 bytes are 2194 * not part of the encrypted blob. 2195 */ 2196 skip = 20; 2197 2198 /* Assumes the first rqst has a transform header as the first iov. 2199 * I.e. 2200 * rqst[0].rq_iov[0] is transform header 2201 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2202 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2203 */ 2204 for (i = 0; i < num_rqst; i++) { 2205 data_size = iov_iter_count(&rqst[i].rq_iter); 2206 2207 /* We really don't want a mixture of pinned and unpinned pages 2208 * in the sglist. It's hard to keep track of which is what. 2209 * Instead, we convert to a BVEC-type iterator higher up. 2210 */ 2211 if (data_size && 2212 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2213 return -EIO; 2214 2215 /* We also don't want to have any extra refs or pins to clean 2216 * up in the sglist. 2217 */ 2218 if (data_size && 2219 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2220 return -EIO; 2221 2222 for (j = 0; j < rqst[i].rq_nvec; j++) { 2223 struct kvec *iov = &rqst[i].rq_iov[j]; 2224 2225 addr = (unsigned long)iov->iov_base + skip; 2226 if (unlikely(is_vmalloc_addr((void *)addr))) { 2227 len = iov->iov_len - skip; 2228 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2229 PAGE_SIZE); 2230 } else { 2231 nents++; 2232 } 2233 skip = 0; 2234 } 2235 if (data_size) 2236 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2237 } 2238 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2239 return nents; 2240 } 2241 2242 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2243 * stack object as buf. 2244 */ 2245 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2246 const void *buf, 2247 unsigned int buflen) 2248 { 2249 unsigned long addr = (unsigned long)buf; 2250 unsigned int off = offset_in_page(addr); 2251 2252 addr &= PAGE_MASK; 2253 if (unlikely(is_vmalloc_addr((void *)addr))) { 2254 do { 2255 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2256 2257 sg_set_page(&sgtable->sgl[sgtable->nents++], 2258 vmalloc_to_page((void *)addr), len, off); 2259 2260 off = 0; 2261 addr += PAGE_SIZE; 2262 buflen -= len; 2263 } while (buflen); 2264 } else { 2265 sg_set_page(&sgtable->sgl[sgtable->nents++], 2266 virt_to_page((void *)addr), buflen, off); 2267 } 2268 } 2269 2270 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2271 ((struct cifs_open_parms) { \ 2272 .tcon = _tcon, \ 2273 .path = _path, \ 2274 .desired_access = (_da), \ 2275 .disposition = (_cd), \ 2276 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2277 .mode = (_mode), \ 2278 .cifs_sb = _cifs_sb, \ 2279 }) 2280 2281 struct smb2_compound_vars { 2282 struct cifs_open_parms oparms; 2283 struct kvec rsp_iov[MAX_COMPOUND]; 2284 struct smb_rqst rqst[MAX_COMPOUND]; 2285 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2286 struct kvec qi_iov; 2287 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2288 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2289 struct kvec close_iov; 2290 struct smb2_file_rename_info rename_info; 2291 struct smb2_file_link_info link_info; 2292 struct kvec ea_iov; 2293 }; 2294 2295 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2296 { 2297 bool ret; 2298 2299 spin_lock(&ses->ses_lock); 2300 ret = ses->ses_status == SES_EXITING; 2301 spin_unlock(&ses->ses_lock); 2302 return ret; 2303 } 2304 2305 #endif /* _CIFS_GLOB_H */ 2306