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 *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */ 182 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 183 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 184 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 185 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 186 187 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 188 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 189 }; 190 191 /* per smb session structure/fields */ 192 struct ntlmssp_auth { 193 bool sesskey_per_smbsess; /* whether session key is per smb session */ 194 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 195 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 196 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 197 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 198 }; 199 200 struct cifs_cred { 201 int uid; 202 int gid; 203 int mode; 204 int cecount; 205 struct cifs_sid osid; 206 struct cifs_sid gsid; 207 struct cifs_ntace *ntaces; 208 struct cifs_ace *aces; 209 }; 210 211 struct cifs_open_info_data { 212 bool adjust_tz; 213 union { 214 bool reparse_point; 215 bool symlink; 216 }; 217 struct { 218 /* ioctl response buffer */ 219 struct { 220 int buftype; 221 struct kvec iov; 222 } io; 223 __u32 tag; 224 union { 225 struct reparse_data_buffer *buf; 226 struct reparse_posix_data *posix; 227 }; 228 } reparse; 229 struct { 230 __u8 eas[SMB2_WSL_MAX_QUERY_EA_RESP_SIZE]; 231 unsigned int eas_len; 232 } wsl; 233 char *symlink_target; 234 struct cifs_sid posix_owner; 235 struct cifs_sid posix_group; 236 union { 237 struct smb2_file_all_info fi; 238 struct smb311_posix_qinfo posix_fi; 239 }; 240 }; 241 242 /* 243 ***************************************************************** 244 * Except the CIFS PDUs themselves all the 245 * globally interesting structs should go here 246 ***************************************************************** 247 */ 248 249 /* 250 * A smb_rqst represents a complete request to be issued to a server. It's 251 * formed by a kvec array, followed by an array of pages. Page data is assumed 252 * to start at the beginning of the first page. 253 */ 254 struct smb_rqst { 255 struct kvec *rq_iov; /* array of kvecs */ 256 unsigned int rq_nvec; /* number of kvecs in array */ 257 size_t rq_iter_size; /* Amount of data in ->rq_iter */ 258 struct iov_iter rq_iter; /* Data iterator */ 259 struct xarray rq_buffer; /* Page buffer for encryption */ 260 }; 261 262 struct mid_q_entry; 263 struct TCP_Server_Info; 264 struct cifsFileInfo; 265 struct cifs_ses; 266 struct cifs_tcon; 267 struct dfs_info3_param; 268 struct cifs_fattr; 269 struct smb3_fs_context; 270 struct cifs_fid; 271 struct cifs_io_subrequest; 272 struct cifs_io_parms; 273 struct cifs_search_info; 274 struct cifsInodeInfo; 275 struct cifs_open_parms; 276 struct cifs_credits; 277 278 struct smb_version_operations { 279 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 280 struct mid_q_entry *); 281 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 282 /* setup request: allocate mid, sign message */ 283 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 284 struct TCP_Server_Info *, 285 struct smb_rqst *); 286 /* setup async request: allocate mid, sign message */ 287 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 288 struct smb_rqst *); 289 /* check response: verify signature, map error */ 290 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 291 bool); 292 void (*add_credits)(struct TCP_Server_Info *server, 293 struct cifs_credits *credits, 294 const int optype); 295 void (*set_credits)(struct TCP_Server_Info *, const int); 296 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 297 unsigned int (*get_credits)(struct mid_q_entry *); 298 __u64 (*get_next_mid)(struct TCP_Server_Info *); 299 void (*revert_current_mid)(struct TCP_Server_Info *server, 300 const unsigned int val); 301 /* data offset from read response message */ 302 unsigned int (*read_data_offset)(char *); 303 /* 304 * Data length from read response message 305 * When in_remaining is true, the returned data length is in 306 * message field DataRemaining for out-of-band data read (e.g through 307 * Memory Registration RDMA write in SMBD). 308 * Otherwise, the returned data length is in message field DataLength. 309 */ 310 unsigned int (*read_data_length)(char *, bool in_remaining); 311 /* map smb to linux error */ 312 int (*map_error)(char *, bool); 313 /* find mid corresponding to the response message */ 314 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 315 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 316 void (*clear_stats)(struct cifs_tcon *); 317 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 318 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 319 /* verify the message */ 320 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 321 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 322 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 323 void (*downgrade_oplock)(struct TCP_Server_Info *server, 324 struct cifsInodeInfo *cinode, __u32 oplock, 325 unsigned int epoch, bool *purge_cache); 326 /* process transaction2 response */ 327 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 328 char *, int); 329 /* check if we need to negotiate */ 330 bool (*need_neg)(struct TCP_Server_Info *); 331 /* negotiate to the server */ 332 int (*negotiate)(const unsigned int xid, 333 struct cifs_ses *ses, 334 struct TCP_Server_Info *server); 335 /* set negotiated write size */ 336 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 337 /* set negotiated read size */ 338 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 339 /* setup smb sessionn */ 340 int (*sess_setup)(const unsigned int, struct cifs_ses *, 341 struct TCP_Server_Info *server, 342 const struct nls_table *); 343 /* close smb session */ 344 int (*logoff)(const unsigned int, struct cifs_ses *); 345 /* connect to a server share */ 346 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 347 struct cifs_tcon *, const struct nls_table *); 348 /* close tree connecion */ 349 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 350 /* get DFS referrals */ 351 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 352 const char *, struct dfs_info3_param **, 353 unsigned int *, const struct nls_table *, int); 354 /* informational QFS call */ 355 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 356 struct cifs_sb_info *); 357 /* query for server interfaces */ 358 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 359 bool); 360 /* check if a path is accessible or not */ 361 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 362 struct cifs_sb_info *, const char *); 363 /* query path data from the server */ 364 int (*query_path_info)(const unsigned int xid, 365 struct cifs_tcon *tcon, 366 struct cifs_sb_info *cifs_sb, 367 const char *full_path, 368 struct cifs_open_info_data *data); 369 /* query file data from the server */ 370 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 371 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 372 /* query reparse point to determine which type of special file */ 373 int (*query_reparse_point)(const unsigned int xid, 374 struct cifs_tcon *tcon, 375 struct cifs_sb_info *cifs_sb, 376 const char *full_path, 377 u32 *tag, struct kvec *rsp, 378 int *rsp_buftype); 379 /* get server index number */ 380 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 381 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 382 struct cifs_open_info_data *data); 383 /* set size by path */ 384 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 385 const char *, __u64, struct cifs_sb_info *, bool, 386 struct dentry *); 387 /* set size by file handle */ 388 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 389 struct cifsFileInfo *, __u64, bool); 390 /* set attributes */ 391 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 392 const unsigned int); 393 int (*set_compression)(const unsigned int, struct cifs_tcon *, 394 struct cifsFileInfo *); 395 /* check if we can send an echo or nor */ 396 bool (*can_echo)(struct TCP_Server_Info *); 397 /* send echo request */ 398 int (*echo)(struct TCP_Server_Info *); 399 /* create directory */ 400 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 401 umode_t mode, struct cifs_tcon *tcon, 402 const char *full_path, 403 struct cifs_sb_info *cifs_sb); 404 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 405 struct cifs_tcon *tcon, const char *name, 406 struct cifs_sb_info *sb); 407 /* set info on created directory */ 408 void (*mkdir_setinfo)(struct inode *, const char *, 409 struct cifs_sb_info *, struct cifs_tcon *, 410 const unsigned int); 411 /* remove directory */ 412 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 413 struct cifs_sb_info *); 414 /* unlink file */ 415 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 416 struct cifs_sb_info *, struct dentry *); 417 /* open, rename and delete file */ 418 int (*rename_pending_delete)(const char *, struct dentry *, 419 const unsigned int); 420 /* send rename request */ 421 int (*rename)(const unsigned int xid, 422 struct cifs_tcon *tcon, 423 struct dentry *source_dentry, 424 const char *from_name, const char *to_name, 425 struct cifs_sb_info *cifs_sb); 426 /* send create hardlink request */ 427 int (*create_hardlink)(const unsigned int xid, 428 struct cifs_tcon *tcon, 429 struct dentry *source_dentry, 430 const char *from_name, const char *to_name, 431 struct cifs_sb_info *cifs_sb); 432 /* query symlink target */ 433 int (*query_symlink)(const unsigned int xid, 434 struct cifs_tcon *tcon, 435 struct cifs_sb_info *cifs_sb, 436 const char *full_path, 437 char **target_path); 438 /* open a file for non-posix mounts */ 439 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 440 void *buf); 441 /* set fid protocol-specific info */ 442 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 443 /* close a file */ 444 int (*close)(const unsigned int, struct cifs_tcon *, 445 struct cifs_fid *); 446 /* close a file, returning file attributes and timestamps */ 447 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 448 struct cifsFileInfo *pfile_info); 449 /* send a flush request to the server */ 450 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 451 /* async read from the server */ 452 int (*async_readv)(struct cifs_io_subrequest *); 453 /* async write to the server */ 454 void (*async_writev)(struct cifs_io_subrequest *); 455 /* sync read from the server */ 456 int (*sync_read)(const unsigned int, struct cifs_fid *, 457 struct cifs_io_parms *, unsigned int *, char **, 458 int *); 459 /* sync write to the server */ 460 int (*sync_write)(const unsigned int, struct cifs_fid *, 461 struct cifs_io_parms *, unsigned int *, struct kvec *, 462 unsigned long); 463 /* open dir, start readdir */ 464 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 465 const char *, struct cifs_sb_info *, 466 struct cifs_fid *, __u16, 467 struct cifs_search_info *); 468 /* continue readdir */ 469 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 470 struct cifs_fid *, 471 __u16, struct cifs_search_info *srch_inf); 472 /* close dir */ 473 int (*close_dir)(const unsigned int, struct cifs_tcon *, 474 struct cifs_fid *); 475 /* calculate a size of SMB message */ 476 unsigned int (*calc_smb_size)(void *buf); 477 /* check for STATUS_PENDING and process the response if yes */ 478 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 479 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 480 bool (*is_session_expired)(char *); 481 /* send oplock break response */ 482 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 483 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 484 /* query remote filesystem */ 485 int (*queryfs)(const unsigned int, struct cifs_tcon *, 486 struct cifs_sb_info *, struct kstatfs *); 487 /* send mandatory brlock to the server */ 488 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 489 __u64, __u32, int, int, bool); 490 /* unlock range of mandatory locks */ 491 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 492 const unsigned int); 493 /* push brlocks from the cache to the server */ 494 int (*push_mand_locks)(struct cifsFileInfo *); 495 /* get lease key of the inode */ 496 void (*get_lease_key)(struct inode *, struct cifs_fid *); 497 /* set lease key of the inode */ 498 void (*set_lease_key)(struct inode *, struct cifs_fid *); 499 /* generate new lease key */ 500 void (*new_lease_key)(struct cifs_fid *); 501 int (*generate_signingkey)(struct cifs_ses *ses, 502 struct TCP_Server_Info *server); 503 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 504 bool allocate_crypto); 505 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 506 struct cifsFileInfo *src_file); 507 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 508 struct cifsFileInfo *src_file, void __user *); 509 int (*notify)(const unsigned int xid, struct file *pfile, 510 void __user *pbuf, bool return_changes); 511 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 512 struct cifs_sb_info *, const unsigned char *, 513 char *, unsigned int *); 514 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 515 struct cifs_sb_info *, const unsigned char *, 516 char *, unsigned int *); 517 /* if we can do cache read operations */ 518 bool (*is_read_op)(__u32); 519 /* set oplock level for the inode */ 520 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 521 bool *); 522 /* create lease context buffer for CREATE request */ 523 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 524 /* parse lease context buffer and return oplock/epoch info */ 525 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 526 ssize_t (*copychunk_range)(const unsigned int, 527 struct cifsFileInfo *src_file, 528 struct cifsFileInfo *target_file, 529 u64 src_off, u64 len, u64 dest_off); 530 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 531 struct cifsFileInfo *target_file, u64 src_off, u64 len, 532 u64 dest_off); 533 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 534 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 535 const unsigned char *, const unsigned char *, char *, 536 size_t, struct cifs_sb_info *); 537 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 538 const char *, const void *, const __u16, 539 const struct nls_table *, struct cifs_sb_info *); 540 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 541 const char *, u32 *, u32); 542 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 543 const struct cifs_fid *, u32 *, u32); 544 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 545 int); 546 /* writepages retry size */ 547 unsigned int (*wp_retry_size)(struct inode *); 548 /* get mtu credits */ 549 int (*wait_mtu_credits)(struct TCP_Server_Info *, size_t, 550 size_t *, struct cifs_credits *); 551 /* adjust previously taken mtu credits to request size */ 552 int (*adjust_credits)(struct TCP_Server_Info *server, 553 struct cifs_io_subrequest *subreq, 554 unsigned int /*enum smb3_rw_credits_trace*/ trace); 555 /* check if we need to issue closedir */ 556 bool (*dir_needs_close)(struct cifsFileInfo *); 557 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 558 loff_t); 559 /* init transform request - used for encryption for now */ 560 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 561 struct smb_rqst *, struct smb_rqst *); 562 int (*is_transform_hdr)(void *buf); 563 int (*receive_transform)(struct TCP_Server_Info *, 564 struct mid_q_entry **, char **, int *); 565 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 566 enum securityEnum); 567 int (*next_header)(struct TCP_Server_Info *server, char *buf, 568 unsigned int *noff); 569 /* ioctl passthrough for query_info */ 570 int (*ioctl_query_info)(const unsigned int xid, 571 struct cifs_tcon *tcon, 572 struct cifs_sb_info *cifs_sb, 573 __le16 *path, int is_dir, 574 unsigned long p); 575 /* make unix special files (block, char, fifo, socket) */ 576 int (*make_node)(unsigned int xid, 577 struct inode *inode, 578 struct dentry *dentry, 579 struct cifs_tcon *tcon, 580 const char *full_path, 581 umode_t mode, 582 dev_t device_number); 583 /* version specific fiemap implementation */ 584 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 585 struct fiemap_extent_info *, u64, u64); 586 /* version specific llseek implementation */ 587 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 588 /* Check for STATUS_IO_TIMEOUT */ 589 bool (*is_status_io_timeout)(char *buf); 590 /* Check for STATUS_NETWORK_NAME_DELETED */ 591 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 592 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 593 struct kvec *rsp_iov, 594 struct cifs_open_info_data *data); 595 int (*create_reparse_symlink)(const unsigned int xid, 596 struct inode *inode, 597 struct dentry *dentry, 598 struct cifs_tcon *tcon, 599 const char *full_path, 600 const char *symname); 601 }; 602 603 struct smb_version_values { 604 char *version_string; 605 __u16 protocol_id; 606 __u32 req_capabilities; 607 __u32 large_lock_type; 608 __u32 exclusive_lock_type; 609 __u32 shared_lock_type; 610 __u32 unlock_lock_type; 611 size_t header_preamble_size; 612 size_t header_size; 613 size_t max_header_size; 614 size_t read_rsp_size; 615 __le16 lock_cmd; 616 unsigned int cap_unix; 617 unsigned int cap_nt_find; 618 unsigned int cap_large_files; 619 __u16 signing_enabled; 620 __u16 signing_required; 621 size_t create_lease_size; 622 }; 623 624 #define HEADER_SIZE(server) (server->vals->header_size) 625 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 626 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 627 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 628 629 /** 630 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 631 * trying to reuse existing superblock for a new mount 632 */ 633 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 634 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 635 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 636 CIFS_MOUNT_MAP_SFM_CHR | \ 637 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 638 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 639 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 640 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 641 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 642 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 643 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 644 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 645 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 646 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 647 648 /** 649 * Generic VFS superblock mount flags (s_flags) to consider when 650 * trying to reuse existing superblock for a new mount 651 */ 652 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 653 SB_NODEV | SB_SYNCHRONOUS) 654 655 struct cifs_mnt_data { 656 struct cifs_sb_info *cifs_sb; 657 struct smb3_fs_context *ctx; 658 int flags; 659 }; 660 661 static inline unsigned int 662 get_rfc1002_length(void *buf) 663 { 664 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 665 } 666 667 static inline void 668 inc_rfc1001_len(void *buf, int count) 669 { 670 be32_add_cpu((__be32 *)buf, count); 671 } 672 673 struct TCP_Server_Info { 674 struct list_head tcp_ses_list; 675 struct list_head smb_ses_list; 676 spinlock_t srv_lock; /* protect anything here that is not protected */ 677 __u64 conn_id; /* connection identifier (useful for debugging) */ 678 int srv_count; /* reference counter */ 679 /* 15 character server name + 0x20 16th byte indicating type = srv */ 680 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 681 struct smb_version_operations *ops; 682 struct smb_version_values *vals; 683 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 684 enum statusEnum tcpStatus; /* what we think the status is */ 685 char *hostname; /* hostname portion of UNC string */ 686 struct socket *ssocket; 687 struct sockaddr_storage dstaddr; 688 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 689 #ifdef CONFIG_NET_NS 690 struct net *net; 691 #endif 692 wait_queue_head_t response_q; 693 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 694 spinlock_t mid_lock; /* protect mid queue and it's entries */ 695 struct list_head pending_mid_q; 696 bool noblocksnd; /* use blocking sendmsg */ 697 bool noautotune; /* do not autotune send buf sizes */ 698 bool nosharesock; 699 bool tcp_nodelay; 700 bool terminate; 701 unsigned int credits; /* send no more requests at once */ 702 unsigned int max_credits; /* can override large 32000 default at mnt */ 703 unsigned int in_flight; /* number of requests on the wire to server */ 704 unsigned int max_in_flight; /* max number of requests that were on wire */ 705 spinlock_t req_lock; /* protect the two values above */ 706 struct mutex _srv_mutex; 707 unsigned int nofs_flag; 708 struct task_struct *tsk; 709 char server_GUID[16]; 710 __u16 sec_mode; 711 bool sign; /* is signing enabled on this connection? */ 712 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 713 bool session_estab; /* mark when very first sess is established */ 714 int echo_credits; /* echo reserved slots */ 715 int oplock_credits; /* oplock break reserved slots */ 716 bool echoes:1; /* enable echoes */ 717 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 718 u16 dialect; /* dialect index that server chose */ 719 bool oplocks:1; /* enable oplocks */ 720 unsigned int maxReq; /* Clients should submit no more */ 721 /* than maxReq distinct unanswered SMBs to the server when using */ 722 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 723 unsigned int maxBuf; /* maxBuf specifies the maximum */ 724 /* message size the server can send or receive for non-raw SMBs */ 725 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 726 /* when socket is setup (and during reconnect) before NegProt sent */ 727 unsigned int max_rw; /* maxRw specifies the maximum */ 728 /* message size the server can send or receive for */ 729 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 730 unsigned int capabilities; /* selective disabling of caps by smb sess */ 731 int timeAdj; /* Adjust for difference in server time zone in sec */ 732 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 733 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 734 /* 16th byte of RFC1001 workstation name is always null */ 735 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 736 __u32 sequence_number; /* for signing, protected by srv_mutex */ 737 __u32 reconnect_instance; /* incremented on each reconnect */ 738 struct session_key session_key; 739 unsigned long lstrp; /* when we got last response from this server */ 740 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 741 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 742 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 743 char negflavor; /* NEGOTIATE response flavor */ 744 /* extended security flavors that server supports */ 745 bool sec_ntlmssp; /* supports NTLMSSP */ 746 bool sec_kerberosu2u; /* supports U2U Kerberos */ 747 bool sec_kerberos; /* supports plain Kerberos */ 748 bool sec_mskerberos; /* supports legacy MS Kerberos */ 749 bool large_buf; /* is current buffer large? */ 750 /* use SMBD connection instead of socket */ 751 bool rdma; 752 /* point to the SMBD connection if RDMA is used instead of socket */ 753 struct smbd_connection *smbd_conn; 754 struct delayed_work echo; /* echo ping workqueue job */ 755 char *smallbuf; /* pointer to current "small" buffer */ 756 char *bigbuf; /* pointer to current "big" buffer */ 757 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 758 unsigned int pdu_size; 759 unsigned int total_read; /* total amount of data read in this pass */ 760 atomic_t in_send; /* requests trying to send */ 761 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 762 #ifdef CONFIG_CIFS_STATS2 763 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 764 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 765 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 766 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 767 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 768 #endif /* STATS2 */ 769 unsigned int max_read; 770 unsigned int max_write; 771 unsigned int min_offload; 772 unsigned int retrans; 773 struct { 774 bool requested; /* "compress" mount option set*/ 775 bool enabled; /* actually negotiated with server */ 776 __le16 alg; /* preferred alg negotiated with server */ 777 } compression; 778 __u16 signing_algorithm; 779 __le16 cipher_type; 780 /* save initital negprot hash */ 781 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 782 bool signing_negotiated; /* true if valid signing context rcvd from server */ 783 bool posix_ext_supported; 784 struct delayed_work reconnect; /* reconnect workqueue job */ 785 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 786 unsigned long echo_interval; 787 788 /* 789 * Number of targets available for reconnect. The more targets 790 * the more tasks have to wait to let the demultiplex thread 791 * reconnect. 792 */ 793 int nr_targets; 794 bool noblockcnt; /* use non-blocking connect() */ 795 796 /* 797 * If this is a session channel, 798 * primary_server holds the ref-counted 799 * pointer to primary channel connection for the session. 800 */ 801 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 802 struct TCP_Server_Info *primary_server; 803 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 804 805 #ifdef CONFIG_CIFS_SWN_UPCALL 806 bool use_swn_dstaddr; 807 struct sockaddr_storage swn_dstaddr; 808 #endif 809 struct mutex refpath_lock; /* protects leaf_fullpath */ 810 /* 811 * leaf_fullpath: Canonical DFS referral path related to this 812 * connection. 813 * It is used in DFS cache refresher, reconnect and may 814 * change due to nested DFS links. 815 * 816 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 817 * mostly used for not requiring a copy of @leaf_fullpath when getting 818 * cached or new DFS referrals (which might also sleep during I/O). 819 * While @srv_lock is held for making string and NULL comparions against 820 * both fields as in mount(2) and cache refresh. 821 * 822 * format: \\HOST\SHARE[\OPTIONAL PATH] 823 */ 824 char *leaf_fullpath; 825 }; 826 827 static inline bool is_smb1(struct TCP_Server_Info *server) 828 { 829 return HEADER_PREAMBLE_SIZE(server) != 0; 830 } 831 832 static inline void cifs_server_lock(struct TCP_Server_Info *server) 833 { 834 unsigned int nofs_flag = memalloc_nofs_save(); 835 836 mutex_lock(&server->_srv_mutex); 837 server->nofs_flag = nofs_flag; 838 } 839 840 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 841 { 842 unsigned int nofs_flag = server->nofs_flag; 843 844 mutex_unlock(&server->_srv_mutex); 845 memalloc_nofs_restore(nofs_flag); 846 } 847 848 struct cifs_credits { 849 unsigned int value; 850 unsigned int instance; 851 unsigned int in_flight_check; 852 unsigned int rreq_debug_id; 853 unsigned int rreq_debug_index; 854 }; 855 856 static inline unsigned int 857 in_flight(struct TCP_Server_Info *server) 858 { 859 unsigned int num; 860 861 spin_lock(&server->req_lock); 862 num = server->in_flight; 863 spin_unlock(&server->req_lock); 864 return num; 865 } 866 867 static inline bool 868 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 869 { 870 int num; 871 872 spin_lock(&server->req_lock); 873 num = *credits; 874 spin_unlock(&server->req_lock); 875 return num >= num_credits; 876 } 877 878 static inline void 879 add_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 880 const int optype) 881 { 882 server->ops->add_credits(server, credits, optype); 883 } 884 885 static inline void 886 add_credits_and_wake_if(struct TCP_Server_Info *server, 887 struct cifs_credits *credits, const int optype) 888 { 889 if (credits->value) { 890 server->ops->add_credits(server, credits, optype); 891 wake_up(&server->request_q); 892 credits->value = 0; 893 } 894 } 895 896 static inline void 897 set_credits(struct TCP_Server_Info *server, const int val) 898 { 899 server->ops->set_credits(server, val); 900 } 901 902 static inline int 903 adjust_credits(struct TCP_Server_Info *server, struct cifs_io_subrequest *subreq, 904 unsigned int /* enum smb3_rw_credits_trace */ trace) 905 { 906 return server->ops->adjust_credits ? 907 server->ops->adjust_credits(server, subreq, trace) : 0; 908 } 909 910 static inline __le64 911 get_next_mid64(struct TCP_Server_Info *server) 912 { 913 return cpu_to_le64(server->ops->get_next_mid(server)); 914 } 915 916 static inline __le16 917 get_next_mid(struct TCP_Server_Info *server) 918 { 919 __u16 mid = server->ops->get_next_mid(server); 920 /* 921 * The value in the SMB header should be little endian for easy 922 * on-the-wire decoding. 923 */ 924 return cpu_to_le16(mid); 925 } 926 927 static inline void 928 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 929 { 930 if (server->ops->revert_current_mid) 931 server->ops->revert_current_mid(server, val); 932 } 933 934 static inline void 935 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 936 const struct smb2_hdr *shdr) 937 { 938 unsigned int num = le16_to_cpu(shdr->CreditCharge); 939 940 return revert_current_mid(server, num > 0 ? num : 1); 941 } 942 943 static inline __u16 944 get_mid(const struct smb_hdr *smb) 945 { 946 return le16_to_cpu(smb->Mid); 947 } 948 949 static inline bool 950 compare_mid(__u16 mid, const struct smb_hdr *smb) 951 { 952 return mid == le16_to_cpu(smb->Mid); 953 } 954 955 /* 956 * When the server supports very large reads and writes via POSIX extensions, 957 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 958 * including the RFC1001 length. 959 * 960 * Note that this might make for "interesting" allocation problems during 961 * writeback however as we have to allocate an array of pointers for the 962 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 963 * 964 * For reads, there is a similar problem as we need to allocate an array 965 * of kvecs to handle the receive, though that should only need to be done 966 * once. 967 */ 968 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 969 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 970 971 /* 972 * When the server doesn't allow large posix writes, only allow a rsize/wsize 973 * of 2^17-1 minus the size of the call header. That allows for a read or 974 * write up to the maximum size described by RFC1002. 975 */ 976 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 977 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 978 979 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 980 981 /* 982 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 983 * those values when posix extensions aren't in force. In actuality here, we 984 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 985 * to be ok with the extra byte even though Windows doesn't send writes that 986 * are that large. 987 * 988 * Citation: 989 * 990 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 991 */ 992 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 993 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 994 995 /* 996 * Macros to allow the TCP_Server_Info->net field and related code to drop out 997 * when CONFIG_NET_NS isn't set. 998 */ 999 1000 #ifdef CONFIG_NET_NS 1001 1002 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1003 { 1004 return srv->net; 1005 } 1006 1007 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1008 { 1009 srv->net = net; 1010 } 1011 1012 #else 1013 1014 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1015 { 1016 return &init_net; 1017 } 1018 1019 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1020 { 1021 } 1022 1023 #endif 1024 1025 struct cifs_server_iface { 1026 struct list_head iface_head; 1027 struct kref refcount; 1028 size_t speed; 1029 size_t weight_fulfilled; 1030 unsigned int num_channels; 1031 unsigned int rdma_capable : 1; 1032 unsigned int rss_capable : 1; 1033 unsigned int is_active : 1; /* unset if non existent */ 1034 struct sockaddr_storage sockaddr; 1035 }; 1036 1037 /* release iface when last ref is dropped */ 1038 static inline void 1039 release_iface(struct kref *ref) 1040 { 1041 struct cifs_server_iface *iface = container_of(ref, 1042 struct cifs_server_iface, 1043 refcount); 1044 kfree(iface); 1045 } 1046 1047 struct cifs_chan { 1048 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1049 struct TCP_Server_Info *server; 1050 struct cifs_server_iface *iface; /* interface in use */ 1051 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1052 }; 1053 1054 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1055 1056 /* 1057 * Session structure. One of these for each uid session with a particular host 1058 */ 1059 struct cifs_ses { 1060 struct list_head smb_ses_list; 1061 struct list_head rlist; /* reconnect list */ 1062 struct list_head tcon_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 #endif 1292 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1293 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1294 }; 1295 1296 /* 1297 * This is a refcounted and timestamped container for a tcon pointer. The 1298 * container holds a tcon reference. It is considered safe to free one of 1299 * these when the tl_count goes to 0. The tl_time is the time of the last 1300 * "get" on the container. 1301 */ 1302 struct tcon_link { 1303 struct rb_node tl_rbnode; 1304 kuid_t tl_uid; 1305 unsigned long tl_flags; 1306 #define TCON_LINK_MASTER 0 1307 #define TCON_LINK_PENDING 1 1308 #define TCON_LINK_IN_TREE 2 1309 unsigned long tl_time; 1310 atomic_t tl_count; 1311 struct cifs_tcon *tl_tcon; 1312 }; 1313 1314 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1315 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1316 1317 static inline struct cifs_tcon * 1318 tlink_tcon(struct tcon_link *tlink) 1319 { 1320 return tlink->tl_tcon; 1321 } 1322 1323 static inline struct tcon_link * 1324 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1325 { 1326 return cifs_sb->master_tlink; 1327 } 1328 1329 extern void cifs_put_tlink(struct tcon_link *tlink); 1330 1331 static inline struct tcon_link * 1332 cifs_get_tlink(struct tcon_link *tlink) 1333 { 1334 if (tlink && !IS_ERR(tlink)) 1335 atomic_inc(&tlink->tl_count); 1336 return tlink; 1337 } 1338 1339 /* This function is always expected to succeed */ 1340 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1341 1342 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1343 1344 struct cifs_pending_open { 1345 struct list_head olist; 1346 struct tcon_link *tlink; 1347 __u8 lease_key[16]; 1348 __u32 oplock; 1349 }; 1350 1351 struct cifs_deferred_close { 1352 struct list_head dlist; 1353 struct tcon_link *tlink; 1354 __u16 netfid; 1355 __u64 persistent_fid; 1356 __u64 volatile_fid; 1357 }; 1358 1359 /* 1360 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1361 * This is used to track byte stream locks on the file 1362 */ 1363 struct cifsLockInfo { 1364 struct list_head llist; /* pointer to next cifsLockInfo */ 1365 struct list_head blist; /* pointer to locks blocked on this */ 1366 wait_queue_head_t block_q; 1367 __u64 offset; 1368 __u64 length; 1369 __u32 pid; 1370 __u16 type; 1371 __u16 flags; 1372 }; 1373 1374 /* 1375 * One of these for each open instance of a file 1376 */ 1377 struct cifs_search_info { 1378 loff_t index_of_last_entry; 1379 __u16 entries_in_buffer; 1380 __u16 info_level; 1381 __u32 resume_key; 1382 char *ntwrk_buf_start; 1383 char *srch_entries_start; 1384 char *last_entry; 1385 const char *presume_name; 1386 unsigned int resume_name_len; 1387 bool endOfSearch:1; 1388 bool emptyDir:1; 1389 bool unicode:1; 1390 bool smallBuf:1; /* so we know which buf_release function to call */ 1391 }; 1392 1393 #define ACL_NO_MODE ((umode_t)(-1)) 1394 struct cifs_open_parms { 1395 struct cifs_tcon *tcon; 1396 struct cifs_sb_info *cifs_sb; 1397 int disposition; 1398 int desired_access; 1399 int create_options; 1400 const char *path; 1401 struct cifs_fid *fid; 1402 umode_t mode; 1403 bool reconnect:1; 1404 bool replay:1; /* indicates that this open is for a replay */ 1405 struct kvec *ea_cctx; 1406 }; 1407 1408 struct cifs_fid { 1409 __u16 netfid; 1410 __u64 persistent_fid; /* persist file id for smb2 */ 1411 __u64 volatile_fid; /* volatile file id for smb2 */ 1412 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1413 __u8 create_guid[16]; 1414 __u32 access; 1415 struct cifs_pending_open *pending_open; 1416 unsigned int epoch; 1417 #ifdef CONFIG_CIFS_DEBUG2 1418 __u64 mid; 1419 #endif /* CIFS_DEBUG2 */ 1420 bool purge_cache; 1421 }; 1422 1423 struct cifs_fid_locks { 1424 struct list_head llist; 1425 struct cifsFileInfo *cfile; /* fid that owns locks */ 1426 struct list_head locks; /* locks held by fid above */ 1427 }; 1428 1429 struct cifsFileInfo { 1430 /* following two lists are protected by tcon->open_file_lock */ 1431 struct list_head tlist; /* pointer to next fid owned by tcon */ 1432 struct list_head flist; /* next fid (file instance) for this inode */ 1433 /* lock list below protected by cifsi->lock_sem */ 1434 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1435 kuid_t uid; /* allows finding which FileInfo structure */ 1436 __u32 pid; /* process id who opened file */ 1437 struct cifs_fid fid; /* file id from remote */ 1438 struct list_head rlist; /* reconnect list */ 1439 /* BB add lock scope info here if needed */ 1440 /* lock scope id (0 if none) */ 1441 struct dentry *dentry; 1442 struct tcon_link *tlink; 1443 unsigned int f_flags; 1444 bool invalidHandle:1; /* file closed via session abend */ 1445 bool swapfile:1; 1446 bool oplock_break_cancelled:1; 1447 bool status_file_deleted:1; /* file has been deleted */ 1448 bool offload:1; /* offload final part of _put to a wq */ 1449 unsigned int oplock_epoch; /* epoch from the lease break */ 1450 __u32 oplock_level; /* oplock/lease level from the lease break */ 1451 int count; 1452 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1453 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1454 struct cifs_search_info srch_inf; 1455 struct work_struct oplock_break; /* work for oplock breaks */ 1456 struct work_struct put; /* work for the final part of _put */ 1457 struct work_struct serverclose; /* work for serverclose */ 1458 struct delayed_work deferred; 1459 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1460 char *symlink_target; 1461 }; 1462 1463 struct cifs_io_parms { 1464 __u16 netfid; 1465 __u64 persistent_fid; /* persist file id for smb2 */ 1466 __u64 volatile_fid; /* volatile file id for smb2 */ 1467 __u32 pid; 1468 __u64 offset; 1469 unsigned int length; 1470 struct cifs_tcon *tcon; 1471 struct TCP_Server_Info *server; 1472 }; 1473 1474 struct cifs_aio_ctx { 1475 struct kref refcount; 1476 struct list_head list; 1477 struct mutex aio_mutex; 1478 struct completion done; 1479 struct iov_iter iter; 1480 struct kiocb *iocb; 1481 struct cifsFileInfo *cfile; 1482 struct bio_vec *bv; 1483 loff_t pos; 1484 unsigned int nr_pinned_pages; 1485 ssize_t rc; 1486 unsigned int len; 1487 unsigned int total_len; 1488 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1489 bool should_dirty; 1490 /* 1491 * Indicates if this aio_ctx is for direct_io, 1492 * If yes, iter is a copy of the user passed iov_iter 1493 */ 1494 bool direct_io; 1495 }; 1496 1497 struct cifs_io_request { 1498 struct netfs_io_request rreq; 1499 struct cifsFileInfo *cfile; 1500 struct TCP_Server_Info *server; 1501 pid_t pid; 1502 }; 1503 1504 /* asynchronous read support */ 1505 struct cifs_io_subrequest { 1506 union { 1507 struct netfs_io_subrequest subreq; 1508 struct netfs_io_request *rreq; 1509 struct cifs_io_request *req; 1510 }; 1511 ssize_t got_bytes; 1512 unsigned int xid; 1513 int result; 1514 bool have_xid; 1515 bool replay; 1516 struct kvec iov[2]; 1517 struct TCP_Server_Info *server; 1518 #ifdef CONFIG_CIFS_SMB_DIRECT 1519 struct smbd_mr *mr; 1520 #endif 1521 struct cifs_credits credits; 1522 }; 1523 1524 /* 1525 * Take a reference on the file private data. Must be called with 1526 * cfile->file_info_lock held. 1527 */ 1528 static inline void 1529 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1530 { 1531 ++cifs_file->count; 1532 } 1533 1534 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1535 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1536 bool offload); 1537 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1538 1539 #define CIFS_CACHE_READ_FLG 1 1540 #define CIFS_CACHE_HANDLE_FLG 2 1541 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1542 #define CIFS_CACHE_WRITE_FLG 4 1543 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1544 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1545 1546 #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)) 1547 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1548 #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)) 1549 1550 /* 1551 * One of these for each file inode 1552 */ 1553 1554 struct cifsInodeInfo { 1555 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1556 bool can_cache_brlcks; 1557 struct list_head llist; /* locks helb by this inode */ 1558 /* 1559 * NOTE: Some code paths call down_read(lock_sem) twice, so 1560 * we must always use cifs_down_write() instead of down_write() 1561 * for this semaphore to avoid deadlocks. 1562 */ 1563 struct rw_semaphore lock_sem; /* protect the fields above */ 1564 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1565 struct list_head openFileList; 1566 spinlock_t open_file_lock; /* protects openFileList */ 1567 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1568 unsigned int oplock; /* oplock/lease level we have */ 1569 unsigned int epoch; /* used to track lease state changes */ 1570 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1571 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1572 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1573 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1574 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1575 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1576 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1577 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1578 unsigned long flags; 1579 spinlock_t writers_lock; 1580 unsigned int writers; /* Number of writers on this inode */ 1581 unsigned long time; /* jiffies of last update of inode */ 1582 u64 uniqueid; /* server inode number */ 1583 u64 createtime; /* creation time on server */ 1584 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1585 struct list_head deferred_closes; /* list of deferred closes */ 1586 spinlock_t deferred_lock; /* protection on deferred list */ 1587 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1588 char *symlink_target; 1589 __u32 reparse_tag; 1590 }; 1591 1592 static inline struct cifsInodeInfo * 1593 CIFS_I(struct inode *inode) 1594 { 1595 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1596 } 1597 1598 static inline struct cifs_sb_info * 1599 CIFS_SB(struct super_block *sb) 1600 { 1601 return sb->s_fs_info; 1602 } 1603 1604 static inline struct cifs_sb_info * 1605 CIFS_FILE_SB(struct file *file) 1606 { 1607 return CIFS_SB(file_inode(file)->i_sb); 1608 } 1609 1610 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1611 { 1612 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1613 return '/'; 1614 else 1615 return '\\'; 1616 } 1617 1618 static inline void 1619 convert_delimiter(char *path, char delim) 1620 { 1621 char old_delim, *pos; 1622 1623 if (delim == '/') 1624 old_delim = '\\'; 1625 else 1626 old_delim = '/'; 1627 1628 pos = path; 1629 while ((pos = strchr(pos, old_delim))) 1630 *pos = delim; 1631 } 1632 1633 #define cifs_stats_inc atomic_inc 1634 1635 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1636 unsigned int bytes) 1637 { 1638 if (bytes) { 1639 spin_lock(&tcon->stat_lock); 1640 tcon->bytes_written += bytes; 1641 spin_unlock(&tcon->stat_lock); 1642 } 1643 } 1644 1645 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1646 unsigned int bytes) 1647 { 1648 spin_lock(&tcon->stat_lock); 1649 tcon->bytes_read += bytes; 1650 spin_unlock(&tcon->stat_lock); 1651 } 1652 1653 1654 /* 1655 * This is the prototype for the mid receive function. This function is for 1656 * receiving the rest of the SMB frame, starting with the WordCount (which is 1657 * just after the MID in struct smb_hdr). Note: 1658 * 1659 * - This will be called by cifsd, with no locks held. 1660 * - The mid will still be on the pending_mid_q. 1661 * - mid->resp_buf will point to the current buffer. 1662 * 1663 * Returns zero on a successful receive, or an error. The receive state in 1664 * the TCP_Server_Info will also be updated. 1665 */ 1666 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1667 struct mid_q_entry *mid); 1668 1669 /* 1670 * This is the prototype for the mid callback function. This is called once the 1671 * mid has been received off of the socket. When creating one, take special 1672 * care to avoid deadlocks. Things to bear in mind: 1673 * 1674 * - it will be called by cifsd, with no locks held 1675 * - the mid will be removed from any lists 1676 */ 1677 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1678 1679 /* 1680 * This is the protopyte for mid handle function. This is called once the mid 1681 * has been recognized after decryption of the message. 1682 */ 1683 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1684 struct mid_q_entry *mid); 1685 1686 /* one of these for every pending CIFS request to the server */ 1687 struct mid_q_entry { 1688 struct list_head qhead; /* mids waiting on reply from this server */ 1689 struct kref refcount; 1690 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1691 __u64 mid; /* multiplex id */ 1692 __u16 credits; /* number of credits consumed by this mid */ 1693 __u16 credits_received; /* number of credits from the response */ 1694 __u32 pid; /* process id */ 1695 __u32 sequence_number; /* for CIFS signing */ 1696 unsigned long when_alloc; /* when mid was created */ 1697 #ifdef CONFIG_CIFS_STATS2 1698 unsigned long when_sent; /* time when smb send finished */ 1699 unsigned long when_received; /* when demux complete (taken off wire) */ 1700 #endif 1701 mid_receive_t *receive; /* call receive callback */ 1702 mid_callback_t *callback; /* call completion callback */ 1703 mid_handle_t *handle; /* call handle mid callback */ 1704 void *callback_data; /* general purpose pointer for callback */ 1705 struct task_struct *creator; 1706 void *resp_buf; /* pointer to received SMB header */ 1707 unsigned int resp_buf_size; 1708 int mid_state; /* wish this were enum but can not pass to wait_event */ 1709 unsigned int mid_flags; 1710 __le16 command; /* smb command code */ 1711 unsigned int optype; /* operation type */ 1712 bool large_buf:1; /* if valid response, is pointer to large buf */ 1713 bool multiRsp:1; /* multiple trans2 responses for one request */ 1714 bool multiEnd:1; /* both received */ 1715 bool decrypted:1; /* decrypted entry */ 1716 }; 1717 1718 struct close_cancelled_open { 1719 struct cifs_fid fid; 1720 struct cifs_tcon *tcon; 1721 struct work_struct work; 1722 __u64 mid; 1723 __u16 cmd; 1724 }; 1725 1726 /* Make code in transport.c a little cleaner by moving 1727 update of optional stats into function below */ 1728 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1729 { 1730 atomic_inc(&server->in_send); 1731 } 1732 1733 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1734 { 1735 atomic_dec(&server->in_send); 1736 } 1737 1738 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1739 { 1740 atomic_inc(&server->num_waiters); 1741 } 1742 1743 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1744 { 1745 atomic_dec(&server->num_waiters); 1746 } 1747 1748 #ifdef CONFIG_CIFS_STATS2 1749 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1750 { 1751 mid->when_sent = jiffies; 1752 } 1753 #else 1754 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1755 { 1756 } 1757 #endif 1758 1759 /* for pending dnotify requests */ 1760 struct dir_notify_req { 1761 struct list_head lhead; 1762 __le16 Pid; 1763 __le16 PidHigh; 1764 __u16 Mid; 1765 __u16 Tid; 1766 __u16 Uid; 1767 __u16 netfid; 1768 __u32 filter; /* CompletionFilter (for multishot) */ 1769 int multishot; 1770 struct file *pfile; 1771 }; 1772 1773 struct dfs_info3_param { 1774 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1775 int path_consumed; 1776 int server_type; 1777 int ref_flag; 1778 char *path_name; 1779 char *node_name; 1780 int ttl; 1781 }; 1782 1783 struct file_list { 1784 struct list_head list; 1785 struct cifsFileInfo *cfile; 1786 }; 1787 1788 struct cifs_mount_ctx { 1789 struct cifs_sb_info *cifs_sb; 1790 struct smb3_fs_context *fs_ctx; 1791 unsigned int xid; 1792 struct TCP_Server_Info *server; 1793 struct cifs_ses *ses; 1794 struct cifs_tcon *tcon; 1795 }; 1796 1797 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1798 { 1799 kfree(param->path_name); 1800 kfree(param->node_name); 1801 } 1802 1803 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1804 { 1805 if (param) 1806 __free_dfs_info_param(param); 1807 } 1808 1809 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1810 { 1811 if (param) { 1812 __free_dfs_info_param(param); 1813 memset(param, 0, sizeof(*param)); 1814 } 1815 } 1816 1817 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1818 int number_of_items) 1819 { 1820 int i; 1821 1822 if ((number_of_items == 0) || (param == NULL)) 1823 return; 1824 for (i = 0; i < number_of_items; i++) { 1825 kfree(param[i].path_name); 1826 kfree(param[i].node_name); 1827 } 1828 kfree(param); 1829 } 1830 1831 static inline bool is_interrupt_error(int error) 1832 { 1833 switch (error) { 1834 case -EINTR: 1835 case -ERESTARTSYS: 1836 case -ERESTARTNOHAND: 1837 case -ERESTARTNOINTR: 1838 return true; 1839 } 1840 return false; 1841 } 1842 1843 static inline bool is_retryable_error(int error) 1844 { 1845 if (is_interrupt_error(error) || error == -EAGAIN) 1846 return true; 1847 return false; 1848 } 1849 1850 static inline bool is_replayable_error(int error) 1851 { 1852 if (error == -EAGAIN || error == -ECONNABORTED) 1853 return true; 1854 return false; 1855 } 1856 1857 1858 /* cifs_get_writable_file() flags */ 1859 #define FIND_WR_ANY 0 1860 #define FIND_WR_FSUID_ONLY 1 1861 #define FIND_WR_WITH_DELETE 2 1862 1863 #define MID_FREE 0 1864 #define MID_REQUEST_ALLOCATED 1 1865 #define MID_REQUEST_SUBMITTED 2 1866 #define MID_RESPONSE_RECEIVED 4 1867 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1868 #define MID_RESPONSE_MALFORMED 0x10 1869 #define MID_SHUTDOWN 0x20 1870 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1871 1872 /* Flags */ 1873 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1874 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1875 1876 /* Types of response buffer returned from SendReceive2 */ 1877 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1878 #define CIFS_SMALL_BUFFER 1 1879 #define CIFS_LARGE_BUFFER 2 1880 #define CIFS_IOVEC 4 /* array of response buffers */ 1881 1882 /* Type of Request to SendReceive2 */ 1883 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1884 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1885 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1886 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1887 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1888 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1889 1890 /* Type of request operation */ 1891 #define CIFS_ECHO_OP 0x080 /* echo request */ 1892 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1893 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1894 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1895 /* Lower bitmask values are reserved by others below. */ 1896 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1897 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1898 1899 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1900 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1901 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1902 1903 /* Security Flags: indicate type of session setup needed */ 1904 #define CIFSSEC_MAY_SIGN 0x00001 1905 #define CIFSSEC_MAY_NTLMV2 0x00004 1906 #define CIFSSEC_MAY_KRB5 0x00008 1907 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1908 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1909 1910 #define CIFSSEC_MUST_SIGN 0x01001 1911 /* note that only one of the following can be set so the 1912 result of setting MUST flags more than once will be to 1913 require use of the stronger protocol */ 1914 #define CIFSSEC_MUST_NTLMV2 0x04004 1915 #define CIFSSEC_MUST_KRB5 0x08008 1916 #ifdef CONFIG_CIFS_UPCALL 1917 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1918 #else 1919 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1920 #endif /* UPCALL */ 1921 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1922 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1923 1924 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP | CIFSSEC_MAY_SEAL) 1925 #define CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL) 1926 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1927 /* 1928 ***************************************************************** 1929 * All constants go here 1930 ***************************************************************** 1931 */ 1932 1933 #define UID_HASH (16) 1934 1935 /* 1936 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1937 * following to be declared. 1938 */ 1939 1940 /**************************************************************************** 1941 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1942 * to the locking order. i.e. if two locks are to be held together, the lock that 1943 * appears higher in this list needs to be taken before the other. 1944 * 1945 * If you hold a lock that is lower in this list, and you need to take a higher lock 1946 * (or if you think that one of the functions that you're calling may need to), first 1947 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1948 * ensure that locks are picked up only in one direction in the below table 1949 * (top to bottom). 1950 * 1951 * Also, if you expect a function to be called with a lock held, explicitly document 1952 * this in the comments on top of your function definition. 1953 * 1954 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1955 * possible. Blocking / calling other functions with a lock held always increase 1956 * the risk of a possible deadlock. 1957 * 1958 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1959 * debug. Also, any new lock that you introduce, please add to this list in the correct 1960 * order. 1961 * 1962 * Please populate this list whenever you introduce new locks in your changes. Or in 1963 * case I've missed some existing locks. Please ensure that it's added in the list 1964 * based on the locking order expected. 1965 * 1966 * ===================================================================================== 1967 * Lock Protects Initialization fn 1968 * ===================================================================================== 1969 * vol_list_lock 1970 * vol_info->ctx_lock vol_info->ctx 1971 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1972 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1973 * reconnect_mutex 1974 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1975 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1976 * cifs_tcon 1977 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1978 * cifs_tcon->pending_opens 1979 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1980 * cifs_tcon->bytes_written 1981 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1982 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1983 * GlobalCurrentXid 1984 * GlobalTotalActiveXid 1985 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1986 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1987 * ->CurrentMid 1988 * (any changes in mid_q_entry fields) 1989 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1990 * ->credits 1991 * ->echo_credits 1992 * ->oplock_credits 1993 * ->reconnect_instance 1994 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1995 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1996 * ->iface_count 1997 * ->iface_last_update 1998 * cifs_ses->chan_lock cifs_ses->chans 1999 * ->chans_need_reconnect 2000 * ->chans_in_reconnect 2001 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 2002 * inode->i_rwsem, taken by fs/netfs/locking.c e.g. should be taken before cifsInodeInfo locks 2003 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 2004 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 2005 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 2006 * ->can_cache_brlcks 2007 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 2008 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 2009 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 2010 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 2011 * ->invalidHandle initiate_cifs_search 2012 * ->oplock_break_cancelled 2013 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 2014 ****************************************************************************/ 2015 2016 #ifdef DECLARE_GLOBALS_HERE 2017 #define GLOBAL_EXTERN 2018 #else 2019 #define GLOBAL_EXTERN extern 2020 #endif 2021 2022 /* 2023 * the list of TCP_Server_Info structures, ie each of the sockets 2024 * connecting our client to a distinct server (ip address), is 2025 * chained together by cifs_tcp_ses_list. The list of all our SMB 2026 * sessions (and from that the tree connections) can be found 2027 * by iterating over cifs_tcp_ses_list 2028 */ 2029 extern struct list_head cifs_tcp_ses_list; 2030 2031 /* 2032 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2033 * tcp session, and the list of tcon's per smb session. It also protects 2034 * the reference counters for the server, smb session, and tcon. 2035 * generally the locks should be taken in order tcp_ses_lock before 2036 * tcon->open_file_lock and that before file->file_info_lock since the 2037 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2038 */ 2039 extern spinlock_t cifs_tcp_ses_lock; 2040 2041 /* 2042 * Global transaction id (XID) information 2043 */ 2044 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2045 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2046 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2047 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2048 2049 /* 2050 * Global counters, updated atomically 2051 */ 2052 extern atomic_t sesInfoAllocCount; 2053 extern atomic_t tconInfoAllocCount; 2054 extern atomic_t tcpSesNextId; 2055 extern atomic_t tcpSesAllocCount; 2056 extern atomic_t tcpSesReconnectCount; 2057 extern atomic_t tconInfoReconnectCount; 2058 2059 /* Various Debug counters */ 2060 extern atomic_t buf_alloc_count; /* current number allocated */ 2061 extern atomic_t small_buf_alloc_count; 2062 #ifdef CONFIG_CIFS_STATS2 2063 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2064 extern atomic_t total_small_buf_alloc_count; 2065 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2066 #endif 2067 2068 /* Misc globals */ 2069 extern bool enable_oplocks; /* enable or disable oplocks */ 2070 extern bool lookupCacheEnabled; 2071 extern unsigned int global_secflags; /* if on, session setup sent 2072 with more secure ntlmssp2 challenge/resp */ 2073 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2074 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2075 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2076 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2077 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2078 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2079 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2080 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2081 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2082 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2083 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2084 extern atomic_t mid_count; 2085 2086 void cifs_oplock_break(struct work_struct *work); 2087 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2088 void smb2_deferred_work_close(struct work_struct *work); 2089 2090 extern const struct slow_work_ops cifs_oplock_break_ops; 2091 extern struct workqueue_struct *cifsiod_wq; 2092 extern struct workqueue_struct *decrypt_wq; 2093 extern struct workqueue_struct *fileinfo_put_wq; 2094 extern struct workqueue_struct *cifsoplockd_wq; 2095 extern struct workqueue_struct *deferredclose_wq; 2096 extern struct workqueue_struct *serverclose_wq; 2097 extern __u32 cifs_lock_secret; 2098 2099 extern mempool_t *cifs_sm_req_poolp; 2100 extern mempool_t *cifs_req_poolp; 2101 extern mempool_t *cifs_mid_poolp; 2102 extern mempool_t cifs_io_request_pool; 2103 extern mempool_t cifs_io_subrequest_pool; 2104 2105 /* Operations for different SMB versions */ 2106 #define SMB1_VERSION_STRING "1.0" 2107 #define SMB20_VERSION_STRING "2.0" 2108 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2109 extern struct smb_version_operations smb1_operations; 2110 extern struct smb_version_values smb1_values; 2111 extern struct smb_version_operations smb20_operations; 2112 extern struct smb_version_values smb20_values; 2113 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2114 #define SMB21_VERSION_STRING "2.1" 2115 extern struct smb_version_operations smb21_operations; 2116 extern struct smb_version_values smb21_values; 2117 #define SMBDEFAULT_VERSION_STRING "default" 2118 extern struct smb_version_values smbdefault_values; 2119 #define SMB3ANY_VERSION_STRING "3" 2120 extern struct smb_version_values smb3any_values; 2121 #define SMB30_VERSION_STRING "3.0" 2122 extern struct smb_version_operations smb30_operations; 2123 extern struct smb_version_values smb30_values; 2124 #define SMB302_VERSION_STRING "3.02" 2125 #define ALT_SMB302_VERSION_STRING "3.0.2" 2126 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2127 extern struct smb_version_values smb302_values; 2128 #define SMB311_VERSION_STRING "3.1.1" 2129 #define ALT_SMB311_VERSION_STRING "3.11" 2130 extern struct smb_version_operations smb311_operations; 2131 extern struct smb_version_values smb311_values; 2132 2133 static inline char *get_security_type_str(enum securityEnum sectype) 2134 { 2135 switch (sectype) { 2136 case RawNTLMSSP: 2137 return "RawNTLMSSP"; 2138 case Kerberos: 2139 return "Kerberos"; 2140 case NTLMv2: 2141 return "NTLMv2"; 2142 default: 2143 return "Unknown"; 2144 } 2145 } 2146 2147 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2148 { 2149 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2150 } 2151 2152 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2153 { 2154 /* 2155 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2156 * Subsystem Notifies That a Share Is a DFS Share. 2157 * 2158 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2159 * Application Updates a Share. 2160 */ 2161 if (!tcon || !tcon->ses || !tcon->ses->server) 2162 return false; 2163 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2164 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2165 } 2166 2167 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2168 const struct dfs_info3_param *ref) 2169 { 2170 /* 2171 * Check if all targets are capable of handling DFS referrals as per 2172 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2173 */ 2174 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2175 } 2176 2177 static inline u64 cifs_flock_len(const struct file_lock *fl) 2178 { 2179 return (u64)fl->fl_end - fl->fl_start + 1; 2180 } 2181 2182 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2183 { 2184 if (WARN_ON_ONCE(!ses || !ses->server)) 2185 return 0; 2186 /* 2187 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2188 * servers do require it during NTLMSSP. 2189 */ 2190 if (ses->server->dialect <= SMB20_PROT_ID) 2191 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2192 return sizeof(ses->workstation_name); 2193 } 2194 2195 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2196 { 2197 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2198 dst->AccessFlags = src->AccessFlags; 2199 dst->CurrentByteOffset = src->CurrentByteOffset; 2200 dst->Mode = src->Mode; 2201 dst->AlignmentRequirement = src->AlignmentRequirement; 2202 dst->FileNameLength = src->FileNameLength; 2203 } 2204 2205 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2206 int num_rqst, 2207 const u8 *sig) 2208 { 2209 unsigned int len, skip; 2210 unsigned int nents = 0; 2211 unsigned long addr; 2212 size_t data_size; 2213 int i, j; 2214 2215 /* 2216 * The first rqst has a transform header where the first 20 bytes are 2217 * not part of the encrypted blob. 2218 */ 2219 skip = 20; 2220 2221 /* Assumes the first rqst has a transform header as the first iov. 2222 * I.e. 2223 * rqst[0].rq_iov[0] is transform header 2224 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2225 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2226 */ 2227 for (i = 0; i < num_rqst; i++) { 2228 data_size = iov_iter_count(&rqst[i].rq_iter); 2229 2230 /* We really don't want a mixture of pinned and unpinned pages 2231 * in the sglist. It's hard to keep track of which is what. 2232 * Instead, we convert to a BVEC-type iterator higher up. 2233 */ 2234 if (data_size && 2235 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2236 return -EIO; 2237 2238 /* We also don't want to have any extra refs or pins to clean 2239 * up in the sglist. 2240 */ 2241 if (data_size && 2242 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2243 return -EIO; 2244 2245 for (j = 0; j < rqst[i].rq_nvec; j++) { 2246 struct kvec *iov = &rqst[i].rq_iov[j]; 2247 2248 addr = (unsigned long)iov->iov_base + skip; 2249 if (unlikely(is_vmalloc_addr((void *)addr))) { 2250 len = iov->iov_len - skip; 2251 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2252 PAGE_SIZE); 2253 } else { 2254 nents++; 2255 } 2256 skip = 0; 2257 } 2258 if (data_size) 2259 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2260 } 2261 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2262 return nents; 2263 } 2264 2265 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2266 * stack object as buf. 2267 */ 2268 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2269 const void *buf, 2270 unsigned int buflen) 2271 { 2272 unsigned long addr = (unsigned long)buf; 2273 unsigned int off = offset_in_page(addr); 2274 2275 addr &= PAGE_MASK; 2276 if (unlikely(is_vmalloc_addr((void *)addr))) { 2277 do { 2278 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2279 2280 sg_set_page(&sgtable->sgl[sgtable->nents++], 2281 vmalloc_to_page((void *)addr), len, off); 2282 2283 off = 0; 2284 addr += PAGE_SIZE; 2285 buflen -= len; 2286 } while (buflen); 2287 } else { 2288 sg_set_page(&sgtable->sgl[sgtable->nents++], 2289 virt_to_page((void *)addr), buflen, off); 2290 } 2291 } 2292 2293 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2294 ((struct cifs_open_parms) { \ 2295 .tcon = _tcon, \ 2296 .path = _path, \ 2297 .desired_access = (_da), \ 2298 .disposition = (_cd), \ 2299 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2300 .mode = (_mode), \ 2301 .cifs_sb = _cifs_sb, \ 2302 }) 2303 2304 struct smb2_compound_vars { 2305 struct cifs_open_parms oparms; 2306 struct kvec rsp_iov[MAX_COMPOUND]; 2307 struct smb_rqst rqst[MAX_COMPOUND]; 2308 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2309 struct kvec qi_iov; 2310 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2311 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2312 struct kvec close_iov; 2313 struct smb2_file_rename_info rename_info; 2314 struct smb2_file_link_info link_info; 2315 struct kvec ea_iov; 2316 }; 2317 2318 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2319 { 2320 bool ret; 2321 2322 spin_lock(&ses->ses_lock); 2323 ret = ses->ses_status == SES_EXITING; 2324 spin_unlock(&ses->ses_lock); 2325 return ret; 2326 } 2327 2328 #endif /* _CIFS_GLOB_H */ 2329