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 upcall_target_enum { 157 UPTARGET_UNSPECIFIED, /* not specified, defaults to app */ 158 UPTARGET_MOUNT, /* upcall to the mount namespace */ 159 UPTARGET_APP, /* upcall to the application namespace which did the mount */ 160 }; 161 162 enum cifs_reparse_type { 163 CIFS_REPARSE_TYPE_NFS, 164 CIFS_REPARSE_TYPE_WSL, 165 CIFS_REPARSE_TYPE_DEFAULT = CIFS_REPARSE_TYPE_NFS, 166 }; 167 168 static inline const char *cifs_reparse_type_str(enum cifs_reparse_type type) 169 { 170 switch (type) { 171 case CIFS_REPARSE_TYPE_NFS: 172 return "nfs"; 173 case CIFS_REPARSE_TYPE_WSL: 174 return "wsl"; 175 default: 176 return "unknown"; 177 } 178 } 179 180 struct session_key { 181 unsigned int len; 182 char *response; 183 }; 184 185 /* crypto hashing related structure/fields, not specific to a sec mech */ 186 struct cifs_secmech { 187 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 188 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 189 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 190 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 191 192 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 193 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 194 }; 195 196 /* per smb session structure/fields */ 197 struct ntlmssp_auth { 198 bool sesskey_per_smbsess; /* whether session key is per smb session */ 199 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 200 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 201 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 202 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 203 }; 204 205 struct cifs_cred { 206 int uid; 207 int gid; 208 int mode; 209 int cecount; 210 struct smb_sid osid; 211 struct smb_sid gsid; 212 struct cifs_ntace *ntaces; 213 struct smb_ace *aces; 214 }; 215 216 struct cifs_open_info_data { 217 bool adjust_tz; 218 union { 219 bool reparse_point; 220 bool symlink; 221 }; 222 struct { 223 /* ioctl response buffer */ 224 struct { 225 int buftype; 226 struct kvec iov; 227 } io; 228 __u32 tag; 229 union { 230 struct reparse_data_buffer *buf; 231 struct reparse_posix_data *posix; 232 }; 233 } reparse; 234 struct { 235 __u8 eas[SMB2_WSL_MAX_QUERY_EA_RESP_SIZE]; 236 unsigned int eas_len; 237 } wsl; 238 char *symlink_target; 239 struct smb_sid posix_owner; 240 struct smb_sid posix_group; 241 union { 242 struct smb2_file_all_info fi; 243 struct smb311_posix_qinfo posix_fi; 244 }; 245 }; 246 247 /* 248 ***************************************************************** 249 * Except the CIFS PDUs themselves all the 250 * globally interesting structs should go here 251 ***************************************************************** 252 */ 253 254 /* 255 * A smb_rqst represents a complete request to be issued to a server. It's 256 * formed by a kvec array, followed by an array of pages. Page data is assumed 257 * to start at the beginning of the first page. 258 */ 259 struct smb_rqst { 260 struct kvec *rq_iov; /* array of kvecs */ 261 unsigned int rq_nvec; /* number of kvecs in array */ 262 struct iov_iter rq_iter; /* Data iterator */ 263 struct folio_queue *rq_buffer; /* Buffer for encryption */ 264 }; 265 266 struct mid_q_entry; 267 struct TCP_Server_Info; 268 struct cifsFileInfo; 269 struct cifs_ses; 270 struct cifs_tcon; 271 struct dfs_info3_param; 272 struct cifs_fattr; 273 struct smb3_fs_context; 274 struct cifs_fid; 275 struct cifs_io_subrequest; 276 struct cifs_io_parms; 277 struct cifs_search_info; 278 struct cifsInodeInfo; 279 struct cifs_open_parms; 280 struct cifs_credits; 281 282 struct smb_version_operations { 283 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 284 struct mid_q_entry *); 285 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 286 /* setup request: allocate mid, sign message */ 287 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 288 struct TCP_Server_Info *, 289 struct smb_rqst *); 290 /* setup async request: allocate mid, sign message */ 291 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 292 struct smb_rqst *); 293 /* check response: verify signature, map error */ 294 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 295 bool); 296 void (*add_credits)(struct TCP_Server_Info *server, 297 struct cifs_credits *credits, 298 const int optype); 299 void (*set_credits)(struct TCP_Server_Info *, const int); 300 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 301 unsigned int (*get_credits)(struct mid_q_entry *); 302 __u64 (*get_next_mid)(struct TCP_Server_Info *); 303 void (*revert_current_mid)(struct TCP_Server_Info *server, 304 const unsigned int val); 305 /* data offset from read response message */ 306 unsigned int (*read_data_offset)(char *); 307 /* 308 * Data length from read response message 309 * When in_remaining is true, the returned data length is in 310 * message field DataRemaining for out-of-band data read (e.g through 311 * Memory Registration RDMA write in SMBD). 312 * Otherwise, the returned data length is in message field DataLength. 313 */ 314 unsigned int (*read_data_length)(char *, bool in_remaining); 315 /* map smb to linux error */ 316 int (*map_error)(char *, bool); 317 /* find mid corresponding to the response message */ 318 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 319 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 320 void (*clear_stats)(struct cifs_tcon *); 321 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 322 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 323 /* verify the message */ 324 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 325 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 326 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 327 void (*downgrade_oplock)(struct TCP_Server_Info *server, 328 struct cifsInodeInfo *cinode, __u32 oplock, 329 unsigned int epoch, bool *purge_cache); 330 /* process transaction2 response */ 331 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 332 char *, int); 333 /* check if we need to negotiate */ 334 bool (*need_neg)(struct TCP_Server_Info *); 335 /* negotiate to the server */ 336 int (*negotiate)(const unsigned int xid, 337 struct cifs_ses *ses, 338 struct TCP_Server_Info *server); 339 /* set negotiated write size */ 340 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 341 /* set negotiated read size */ 342 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 343 /* setup smb sessionn */ 344 int (*sess_setup)(const unsigned int, struct cifs_ses *, 345 struct TCP_Server_Info *server, 346 const struct nls_table *); 347 /* close smb session */ 348 int (*logoff)(const unsigned int, struct cifs_ses *); 349 /* connect to a server share */ 350 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 351 struct cifs_tcon *, const struct nls_table *); 352 /* close tree connection */ 353 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 354 /* get DFS referrals */ 355 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 356 const char *, struct dfs_info3_param **, 357 unsigned int *, const struct nls_table *, int); 358 /* informational QFS call */ 359 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 360 struct cifs_sb_info *); 361 /* query for server interfaces */ 362 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 363 bool); 364 /* check if a path is accessible or not */ 365 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 366 struct cifs_sb_info *, const char *); 367 /* query path data from the server */ 368 int (*query_path_info)(const unsigned int xid, 369 struct cifs_tcon *tcon, 370 struct cifs_sb_info *cifs_sb, 371 const char *full_path, 372 struct cifs_open_info_data *data); 373 /* query file data from the server */ 374 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 375 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 376 /* query reparse point to determine which type of special file */ 377 int (*query_reparse_point)(const unsigned int xid, 378 struct cifs_tcon *tcon, 379 struct cifs_sb_info *cifs_sb, 380 const char *full_path, 381 u32 *tag, struct kvec *rsp, 382 int *rsp_buftype); 383 /* get server index number */ 384 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 385 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 386 struct cifs_open_info_data *data); 387 /* set size by path */ 388 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 389 const char *, __u64, struct cifs_sb_info *, bool, 390 struct dentry *); 391 /* set size by file handle */ 392 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 393 struct cifsFileInfo *, __u64, bool); 394 /* set attributes */ 395 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 396 const unsigned int); 397 int (*set_compression)(const unsigned int, struct cifs_tcon *, 398 struct cifsFileInfo *); 399 /* check if we can send an echo or nor */ 400 bool (*can_echo)(struct TCP_Server_Info *); 401 /* send echo request */ 402 int (*echo)(struct TCP_Server_Info *); 403 /* create directory */ 404 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 405 umode_t mode, struct cifs_tcon *tcon, 406 const char *full_path, 407 struct cifs_sb_info *cifs_sb); 408 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 409 struct cifs_tcon *tcon, const char *name, 410 struct cifs_sb_info *sb); 411 /* set info on created directory */ 412 void (*mkdir_setinfo)(struct inode *, const char *, 413 struct cifs_sb_info *, struct cifs_tcon *, 414 const unsigned int); 415 /* remove directory */ 416 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 417 struct cifs_sb_info *); 418 /* unlink file */ 419 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 420 struct cifs_sb_info *, struct dentry *); 421 /* open, rename and delete file */ 422 int (*rename_pending_delete)(const char *, struct dentry *, 423 const unsigned int); 424 /* send rename request */ 425 int (*rename)(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 /* send create hardlink request */ 431 int (*create_hardlink)(const unsigned int xid, 432 struct cifs_tcon *tcon, 433 struct dentry *source_dentry, 434 const char *from_name, const char *to_name, 435 struct cifs_sb_info *cifs_sb); 436 /* query symlink target */ 437 int (*query_symlink)(const unsigned int xid, 438 struct cifs_tcon *tcon, 439 struct cifs_sb_info *cifs_sb, 440 const char *full_path, 441 char **target_path); 442 /* open a file for non-posix mounts */ 443 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 444 void *buf); 445 /* set fid protocol-specific info */ 446 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 447 /* close a file */ 448 int (*close)(const unsigned int, struct cifs_tcon *, 449 struct cifs_fid *); 450 /* close a file, returning file attributes and timestamps */ 451 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 452 struct cifsFileInfo *pfile_info); 453 /* send a flush request to the server */ 454 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 455 /* async read from the server */ 456 int (*async_readv)(struct cifs_io_subrequest *); 457 /* async write to the server */ 458 void (*async_writev)(struct cifs_io_subrequest *); 459 /* sync read from the server */ 460 int (*sync_read)(const unsigned int, struct cifs_fid *, 461 struct cifs_io_parms *, unsigned int *, char **, 462 int *); 463 /* sync write to the server */ 464 int (*sync_write)(const unsigned int, struct cifs_fid *, 465 struct cifs_io_parms *, unsigned int *, struct kvec *, 466 unsigned long); 467 /* open dir, start readdir */ 468 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 469 const char *, struct cifs_sb_info *, 470 struct cifs_fid *, __u16, 471 struct cifs_search_info *); 472 /* continue readdir */ 473 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 474 struct cifs_fid *, 475 __u16, struct cifs_search_info *srch_inf); 476 /* close dir */ 477 int (*close_dir)(const unsigned int, struct cifs_tcon *, 478 struct cifs_fid *); 479 /* calculate a size of SMB message */ 480 unsigned int (*calc_smb_size)(void *buf); 481 /* check for STATUS_PENDING and process the response if yes */ 482 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 483 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 484 bool (*is_session_expired)(char *); 485 /* send oplock break response */ 486 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 487 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 488 /* query remote filesystem */ 489 int (*queryfs)(const unsigned int, struct cifs_tcon *, 490 const char *, struct cifs_sb_info *, struct kstatfs *); 491 /* send mandatory brlock to the server */ 492 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 493 __u64, __u32, int, int, bool); 494 /* unlock range of mandatory locks */ 495 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 496 const unsigned int); 497 /* push brlocks from the cache to the server */ 498 int (*push_mand_locks)(struct cifsFileInfo *); 499 /* get lease key of the inode */ 500 void (*get_lease_key)(struct inode *, struct cifs_fid *); 501 /* set lease key of the inode */ 502 void (*set_lease_key)(struct inode *, struct cifs_fid *); 503 /* generate new lease key */ 504 void (*new_lease_key)(struct cifs_fid *); 505 int (*generate_signingkey)(struct cifs_ses *ses, 506 struct TCP_Server_Info *server); 507 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 508 bool allocate_crypto); 509 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 510 struct cifsFileInfo *src_file); 511 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 512 struct cifsFileInfo *src_file, void __user *); 513 int (*notify)(const unsigned int xid, struct file *pfile, 514 void __user *pbuf, bool return_changes); 515 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 516 struct cifs_sb_info *, const unsigned char *, 517 char *, unsigned int *); 518 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 519 struct cifs_sb_info *, const unsigned char *, 520 char *, unsigned int *); 521 /* if we can do cache read operations */ 522 bool (*is_read_op)(__u32); 523 /* set oplock level for the inode */ 524 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 525 bool *); 526 /* create lease context buffer for CREATE request */ 527 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 528 /* parse lease context buffer and return oplock/epoch info */ 529 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 530 ssize_t (*copychunk_range)(const unsigned int, 531 struct cifsFileInfo *src_file, 532 struct cifsFileInfo *target_file, 533 u64 src_off, u64 len, u64 dest_off); 534 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 535 struct cifsFileInfo *target_file, u64 src_off, u64 len, 536 u64 dest_off); 537 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 538 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 539 const unsigned char *, const unsigned char *, char *, 540 size_t, struct cifs_sb_info *); 541 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 542 const char *, const void *, const __u16, 543 const struct nls_table *, struct cifs_sb_info *); 544 struct smb_ntsd * (*get_acl)(struct cifs_sb_info *cifssb, struct inode *ino, 545 const char *patch, u32 *plen, u32 info); 546 struct smb_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *cifssmb, 547 const struct cifs_fid *pfid, u32 *plen, u32 info); 548 int (*set_acl)(struct smb_ntsd *pntsd, __u32 len, struct inode *ino, const char *path, 549 int flag); 550 /* writepages retry size */ 551 unsigned int (*wp_retry_size)(struct inode *); 552 /* get mtu credits */ 553 int (*wait_mtu_credits)(struct TCP_Server_Info *, size_t, 554 size_t *, struct cifs_credits *); 555 /* adjust previously taken mtu credits to request size */ 556 int (*adjust_credits)(struct TCP_Server_Info *server, 557 struct cifs_io_subrequest *subreq, 558 unsigned int /*enum smb3_rw_credits_trace*/ trace); 559 /* check if we need to issue closedir */ 560 bool (*dir_needs_close)(struct cifsFileInfo *); 561 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 562 loff_t); 563 /* init transform (compress/encrypt) request */ 564 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 565 struct smb_rqst *, struct smb_rqst *); 566 int (*is_transform_hdr)(void *buf); 567 int (*receive_transform)(struct TCP_Server_Info *, 568 struct mid_q_entry **, char **, int *); 569 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 570 enum securityEnum); 571 int (*next_header)(struct TCP_Server_Info *server, char *buf, 572 unsigned int *noff); 573 /* ioctl passthrough for query_info */ 574 int (*ioctl_query_info)(const unsigned int xid, 575 struct cifs_tcon *tcon, 576 struct cifs_sb_info *cifs_sb, 577 __le16 *path, int is_dir, 578 unsigned long p); 579 /* make unix special files (block, char, fifo, socket) */ 580 int (*make_node)(unsigned int xid, 581 struct inode *inode, 582 struct dentry *dentry, 583 struct cifs_tcon *tcon, 584 const char *full_path, 585 umode_t mode, 586 dev_t device_number); 587 /* version specific fiemap implementation */ 588 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 589 struct fiemap_extent_info *, u64, u64); 590 /* version specific llseek implementation */ 591 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 592 /* Check for STATUS_IO_TIMEOUT */ 593 bool (*is_status_io_timeout)(char *buf); 594 /* Check for STATUS_NETWORK_NAME_DELETED */ 595 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 596 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 597 struct kvec *rsp_iov, 598 struct cifs_open_info_data *data); 599 int (*create_reparse_symlink)(const unsigned int xid, 600 struct inode *inode, 601 struct dentry *dentry, 602 struct cifs_tcon *tcon, 603 const char *full_path, 604 const char *symname); 605 }; 606 607 struct smb_version_values { 608 char *version_string; 609 __u16 protocol_id; 610 __u32 req_capabilities; 611 __u32 large_lock_type; 612 __u32 exclusive_lock_type; 613 __u32 shared_lock_type; 614 __u32 unlock_lock_type; 615 size_t header_preamble_size; 616 size_t header_size; 617 size_t max_header_size; 618 size_t read_rsp_size; 619 __le16 lock_cmd; 620 unsigned int cap_unix; 621 unsigned int cap_nt_find; 622 unsigned int cap_large_files; 623 __u16 signing_enabled; 624 __u16 signing_required; 625 size_t create_lease_size; 626 }; 627 628 #define HEADER_SIZE(server) (server->vals->header_size) 629 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 630 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 631 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 632 633 /** 634 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 635 * trying to reuse existing superblock for a new mount 636 */ 637 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 638 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 639 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 640 CIFS_MOUNT_MAP_SFM_CHR | \ 641 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 642 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 643 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 644 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 645 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 646 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 647 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 648 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 649 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 650 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 651 652 /** 653 * Generic VFS superblock mount flags (s_flags) to consider when 654 * trying to reuse existing superblock for a new mount 655 */ 656 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 657 SB_NODEV | SB_SYNCHRONOUS) 658 659 struct cifs_mnt_data { 660 struct cifs_sb_info *cifs_sb; 661 struct smb3_fs_context *ctx; 662 int flags; 663 }; 664 665 static inline unsigned int 666 get_rfc1002_length(void *buf) 667 { 668 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 669 } 670 671 static inline void 672 inc_rfc1001_len(void *buf, int count) 673 { 674 be32_add_cpu((__be32 *)buf, count); 675 } 676 677 struct TCP_Server_Info { 678 struct list_head tcp_ses_list; 679 struct list_head smb_ses_list; 680 spinlock_t srv_lock; /* protect anything here that is not protected */ 681 __u64 conn_id; /* connection identifier (useful for debugging) */ 682 int srv_count; /* reference counter */ 683 /* 15 character server name + 0x20 16th byte indicating type = srv */ 684 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 685 struct smb_version_operations *ops; 686 struct smb_version_values *vals; 687 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 688 enum statusEnum tcpStatus; /* what we think the status is */ 689 char *hostname; /* hostname portion of UNC string */ 690 struct socket *ssocket; 691 struct sockaddr_storage dstaddr; 692 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 693 #ifdef CONFIG_NET_NS 694 struct net *net; 695 #endif 696 wait_queue_head_t response_q; 697 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 698 spinlock_t mid_lock; /* protect mid queue and it's entries */ 699 struct list_head pending_mid_q; 700 bool noblocksnd; /* use blocking sendmsg */ 701 bool noautotune; /* do not autotune send buf sizes */ 702 bool nosharesock; 703 bool tcp_nodelay; 704 bool terminate; 705 unsigned int credits; /* send no more requests at once */ 706 unsigned int max_credits; /* can override large 32000 default at mnt */ 707 unsigned int in_flight; /* number of requests on the wire to server */ 708 unsigned int max_in_flight; /* max number of requests that were on wire */ 709 spinlock_t req_lock; /* protect the two values above */ 710 struct mutex _srv_mutex; 711 unsigned int nofs_flag; 712 struct task_struct *tsk; 713 char server_GUID[16]; 714 __u16 sec_mode; 715 bool sign; /* is signing enabled on this connection? */ 716 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 717 bool session_estab; /* mark when very first sess is established */ 718 int echo_credits; /* echo reserved slots */ 719 int oplock_credits; /* oplock break reserved slots */ 720 bool echoes:1; /* enable echoes */ 721 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 722 u16 dialect; /* dialect index that server chose */ 723 bool oplocks:1; /* enable oplocks */ 724 unsigned int maxReq; /* Clients should submit no more */ 725 /* than maxReq distinct unanswered SMBs to the server when using */ 726 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 727 unsigned int maxBuf; /* maxBuf specifies the maximum */ 728 /* message size the server can send or receive for non-raw SMBs */ 729 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 730 /* when socket is setup (and during reconnect) before NegProt sent */ 731 unsigned int max_rw; /* maxRw specifies the maximum */ 732 /* message size the server can send or receive for */ 733 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 734 unsigned int capabilities; /* selective disabling of caps by smb sess */ 735 int timeAdj; /* Adjust for difference in server time zone in sec */ 736 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 737 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 738 /* 16th byte of RFC1001 workstation name is always null */ 739 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 740 __u32 sequence_number; /* for signing, protected by srv_mutex */ 741 __u32 reconnect_instance; /* incremented on each reconnect */ 742 struct session_key session_key; 743 unsigned long lstrp; /* when we got last response from this server */ 744 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 745 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 746 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 747 char negflavor; /* NEGOTIATE response flavor */ 748 /* extended security flavors that server supports */ 749 bool sec_ntlmssp; /* supports NTLMSSP */ 750 bool sec_kerberosu2u; /* supports U2U Kerberos */ 751 bool sec_kerberos; /* supports plain Kerberos */ 752 bool sec_mskerberos; /* supports legacy MS Kerberos */ 753 bool large_buf; /* is current buffer large? */ 754 /* use SMBD connection instead of socket */ 755 bool rdma; 756 /* point to the SMBD connection if RDMA is used instead of socket */ 757 struct smbd_connection *smbd_conn; 758 struct delayed_work echo; /* echo ping workqueue job */ 759 char *smallbuf; /* pointer to current "small" buffer */ 760 char *bigbuf; /* pointer to current "big" buffer */ 761 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 762 unsigned int pdu_size; 763 unsigned int total_read; /* total amount of data read in this pass */ 764 atomic_t in_send; /* requests trying to send */ 765 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 766 #ifdef CONFIG_CIFS_STATS2 767 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 768 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 769 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 770 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 771 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 772 #endif /* STATS2 */ 773 unsigned int max_read; 774 unsigned int max_write; 775 unsigned int min_offload; 776 unsigned int retrans; 777 struct { 778 bool requested; /* "compress" mount option set*/ 779 bool enabled; /* actually negotiated with server */ 780 __le16 alg; /* preferred alg negotiated with server */ 781 } compression; 782 __u16 signing_algorithm; 783 __le16 cipher_type; 784 /* save initial negprot hash */ 785 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 786 bool signing_negotiated; /* true if valid signing context rcvd from server */ 787 bool posix_ext_supported; 788 struct delayed_work reconnect; /* reconnect workqueue job */ 789 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 790 unsigned long echo_interval; 791 792 /* 793 * Number of targets available for reconnect. The more targets 794 * the more tasks have to wait to let the demultiplex thread 795 * reconnect. 796 */ 797 int nr_targets; 798 bool noblockcnt; /* use non-blocking connect() */ 799 800 /* 801 * If this is a session channel, 802 * primary_server holds the ref-counted 803 * pointer to primary channel connection for the session. 804 */ 805 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 806 struct TCP_Server_Info *primary_server; 807 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 808 809 #ifdef CONFIG_CIFS_SWN_UPCALL 810 bool use_swn_dstaddr; 811 struct sockaddr_storage swn_dstaddr; 812 #endif 813 struct mutex refpath_lock; /* protects leaf_fullpath */ 814 /* 815 * leaf_fullpath: Canonical DFS referral path related to this 816 * connection. 817 * It is used in DFS cache refresher, reconnect and may 818 * change due to nested DFS links. 819 * 820 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 821 * mostly used for not requiring a copy of @leaf_fullpath when getting 822 * cached or new DFS referrals (which might also sleep during I/O). 823 * While @srv_lock is held for making string and NULL comparisons against 824 * both fields as in mount(2) and cache refresh. 825 * 826 * format: \\HOST\SHARE[\OPTIONAL PATH] 827 */ 828 char *leaf_fullpath; 829 bool dfs_conn:1; 830 }; 831 832 static inline bool is_smb1(struct TCP_Server_Info *server) 833 { 834 return HEADER_PREAMBLE_SIZE(server) != 0; 835 } 836 837 static inline void cifs_server_lock(struct TCP_Server_Info *server) 838 { 839 unsigned int nofs_flag = memalloc_nofs_save(); 840 841 mutex_lock(&server->_srv_mutex); 842 server->nofs_flag = nofs_flag; 843 } 844 845 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 846 { 847 unsigned int nofs_flag = server->nofs_flag; 848 849 mutex_unlock(&server->_srv_mutex); 850 memalloc_nofs_restore(nofs_flag); 851 } 852 853 struct cifs_credits { 854 unsigned int value; 855 unsigned int instance; 856 unsigned int in_flight_check; 857 unsigned int rreq_debug_id; 858 unsigned int rreq_debug_index; 859 }; 860 861 static inline unsigned int 862 in_flight(struct TCP_Server_Info *server) 863 { 864 unsigned int num; 865 866 spin_lock(&server->req_lock); 867 num = server->in_flight; 868 spin_unlock(&server->req_lock); 869 return num; 870 } 871 872 static inline bool 873 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 874 { 875 int num; 876 877 spin_lock(&server->req_lock); 878 num = *credits; 879 spin_unlock(&server->req_lock); 880 return num >= num_credits; 881 } 882 883 static inline void 884 add_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 885 const int optype) 886 { 887 server->ops->add_credits(server, credits, optype); 888 } 889 890 static inline void 891 add_credits_and_wake_if(struct TCP_Server_Info *server, 892 struct cifs_credits *credits, const int optype) 893 { 894 if (credits->value) { 895 server->ops->add_credits(server, credits, optype); 896 wake_up(&server->request_q); 897 credits->value = 0; 898 } 899 } 900 901 static inline void 902 set_credits(struct TCP_Server_Info *server, const int val) 903 { 904 server->ops->set_credits(server, val); 905 } 906 907 static inline int 908 adjust_credits(struct TCP_Server_Info *server, struct cifs_io_subrequest *subreq, 909 unsigned int /* enum smb3_rw_credits_trace */ trace) 910 { 911 return server->ops->adjust_credits ? 912 server->ops->adjust_credits(server, subreq, trace) : 0; 913 } 914 915 static inline __le64 916 get_next_mid64(struct TCP_Server_Info *server) 917 { 918 return cpu_to_le64(server->ops->get_next_mid(server)); 919 } 920 921 static inline __le16 922 get_next_mid(struct TCP_Server_Info *server) 923 { 924 __u16 mid = server->ops->get_next_mid(server); 925 /* 926 * The value in the SMB header should be little endian for easy 927 * on-the-wire decoding. 928 */ 929 return cpu_to_le16(mid); 930 } 931 932 static inline void 933 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 934 { 935 if (server->ops->revert_current_mid) 936 server->ops->revert_current_mid(server, val); 937 } 938 939 static inline void 940 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 941 const struct smb2_hdr *shdr) 942 { 943 unsigned int num = le16_to_cpu(shdr->CreditCharge); 944 945 return revert_current_mid(server, num > 0 ? num : 1); 946 } 947 948 static inline __u16 949 get_mid(const struct smb_hdr *smb) 950 { 951 return le16_to_cpu(smb->Mid); 952 } 953 954 static inline bool 955 compare_mid(__u16 mid, const struct smb_hdr *smb) 956 { 957 return mid == le16_to_cpu(smb->Mid); 958 } 959 960 /* 961 * When the server supports very large reads and writes via POSIX extensions, 962 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 963 * including the RFC1001 length. 964 * 965 * Note that this might make for "interesting" allocation problems during 966 * writeback however as we have to allocate an array of pointers for the 967 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 968 * 969 * For reads, there is a similar problem as we need to allocate an array 970 * of kvecs to handle the receive, though that should only need to be done 971 * once. 972 */ 973 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 974 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 975 976 /* 977 * When the server doesn't allow large posix writes, only allow a rsize/wsize 978 * of 2^17-1 minus the size of the call header. That allows for a read or 979 * write up to the maximum size described by RFC1002. 980 */ 981 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 982 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 983 984 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 985 986 /* 987 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 988 * those values when posix extensions aren't in force. In actuality here, we 989 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 990 * to be ok with the extra byte even though Windows doesn't send writes that 991 * are that large. 992 * 993 * Citation: 994 * 995 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 996 */ 997 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 998 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 999 1000 /* 1001 * Macros to allow the TCP_Server_Info->net field and related code to drop out 1002 * when CONFIG_NET_NS isn't set. 1003 */ 1004 1005 #ifdef CONFIG_NET_NS 1006 1007 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1008 { 1009 return srv->net; 1010 } 1011 1012 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1013 { 1014 srv->net = net; 1015 } 1016 1017 #else 1018 1019 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1020 { 1021 return &init_net; 1022 } 1023 1024 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1025 { 1026 } 1027 1028 #endif 1029 1030 struct cifs_server_iface { 1031 struct list_head iface_head; 1032 struct kref refcount; 1033 size_t speed; 1034 size_t weight_fulfilled; 1035 unsigned int num_channels; 1036 unsigned int rdma_capable : 1; 1037 unsigned int rss_capable : 1; 1038 unsigned int is_active : 1; /* unset if non existent */ 1039 struct sockaddr_storage sockaddr; 1040 }; 1041 1042 /* release iface when last ref is dropped */ 1043 static inline void 1044 release_iface(struct kref *ref) 1045 { 1046 struct cifs_server_iface *iface = container_of(ref, 1047 struct cifs_server_iface, 1048 refcount); 1049 kfree(iface); 1050 } 1051 1052 struct cifs_chan { 1053 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1054 struct TCP_Server_Info *server; 1055 struct cifs_server_iface *iface; /* interface in use */ 1056 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1057 }; 1058 1059 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1060 1061 /* 1062 * Session structure. One of these for each uid session with a particular host 1063 */ 1064 struct cifs_ses { 1065 struct list_head smb_ses_list; 1066 struct list_head rlist; /* reconnect list */ 1067 struct list_head tcon_list; 1068 struct list_head dlist; /* dfs list */ 1069 struct cifs_tcon *tcon_ipc; 1070 spinlock_t ses_lock; /* protect anything here that is not protected */ 1071 struct mutex session_mutex; 1072 struct TCP_Server_Info *server; /* pointer to server info */ 1073 int ses_count; /* reference counter */ 1074 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1075 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1076 char *serverOS; /* name of operating system underlying server */ 1077 char *serverNOS; /* name of network operating system of server */ 1078 char *serverDomain; /* security realm of server */ 1079 __u64 Suid; /* remote smb uid */ 1080 kuid_t linux_uid; /* overriding owner of files on the mount */ 1081 kuid_t cred_uid; /* owner of credentials */ 1082 unsigned int capabilities; 1083 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1084 char *user_name; /* must not be null except during init of sess 1085 and after mount option parsing we fill it */ 1086 char *domainName; 1087 char *password; 1088 char *password2; /* When key rotation used, new password may be set before it expires */ 1089 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1090 struct session_key auth_key; 1091 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1092 enum securityEnum sectype; /* what security flavor was specified? */ 1093 enum upcall_target_enum upcall_target; /* what upcall target was specified? */ 1094 bool sign; /* is signing required? */ 1095 bool domainAuto:1; 1096 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1097 unsigned int flags; 1098 __u16 session_flags; 1099 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1100 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1101 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1102 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1103 1104 /* 1105 * Network interfaces available on the server this session is 1106 * connected to. 1107 * 1108 * Other channels can be opened by connecting and binding this 1109 * session to interfaces from this list. 1110 * 1111 * iface_lock should be taken when accessing any of these fields 1112 */ 1113 spinlock_t iface_lock; 1114 /* ========= begin: protected by iface_lock ======== */ 1115 struct list_head iface_list; 1116 size_t iface_count; 1117 unsigned long iface_last_update; /* jiffies */ 1118 /* ========= end: protected by iface_lock ======== */ 1119 1120 spinlock_t chan_lock; 1121 /* ========= begin: protected by chan_lock ======== */ 1122 #define CIFS_MAX_CHANNELS 16 1123 #define CIFS_INVAL_CHAN_INDEX (-1) 1124 #define CIFS_ALL_CHANNELS_SET(ses) \ 1125 ((1UL << (ses)->chan_count) - 1) 1126 #define CIFS_ALL_CHANS_GOOD(ses) \ 1127 (!(ses)->chans_need_reconnect) 1128 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1129 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1130 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1131 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1132 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1133 test_bit((index), &(ses)->chans_need_reconnect) 1134 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1135 ((ses)->chans[(index)].in_reconnect) 1136 1137 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1138 size_t chan_count; 1139 size_t chan_max; 1140 atomic_t chan_seq; /* round robin state */ 1141 1142 /* 1143 * chans_need_reconnect is a bitmap indicating which of the channels 1144 * under this smb session needs to be reconnected. 1145 * If not multichannel session, only one bit will be used. 1146 * 1147 * We will ask for sess and tcon reconnection only if all the 1148 * channels are marked for needing reconnection. This will 1149 * enable the sessions on top to continue to live till any 1150 * of the channels below are active. 1151 */ 1152 unsigned long chans_need_reconnect; 1153 /* ========= end: protected by chan_lock ======== */ 1154 struct cifs_ses *dfs_root_ses; 1155 struct nls_table *local_nls; 1156 }; 1157 1158 static inline bool 1159 cap_unix(struct cifs_ses *ses) 1160 { 1161 return ses->server->vals->cap_unix & ses->capabilities; 1162 } 1163 1164 /* 1165 * common struct for holding inode info when searching for or updating an 1166 * inode with new info 1167 */ 1168 1169 #define CIFS_FATTR_JUNCTION 0x1 1170 #define CIFS_FATTR_DELETE_PENDING 0x2 1171 #define CIFS_FATTR_NEED_REVAL 0x4 1172 #define CIFS_FATTR_INO_COLLISION 0x8 1173 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1174 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1175 1176 struct cifs_fattr { 1177 u32 cf_flags; 1178 u32 cf_cifsattrs; 1179 u64 cf_uniqueid; 1180 u64 cf_eof; 1181 u64 cf_bytes; 1182 u64 cf_createtime; 1183 kuid_t cf_uid; 1184 kgid_t cf_gid; 1185 umode_t cf_mode; 1186 dev_t cf_rdev; 1187 unsigned int cf_nlink; 1188 unsigned int cf_dtype; 1189 struct timespec64 cf_atime; 1190 struct timespec64 cf_mtime; 1191 struct timespec64 cf_ctime; 1192 u32 cf_cifstag; 1193 char *cf_symlink_target; 1194 }; 1195 1196 /* 1197 * there is one of these for each connection to a resource on a particular 1198 * session 1199 */ 1200 struct cifs_tcon { 1201 struct list_head tcon_list; 1202 int debug_id; /* Debugging for tracing */ 1203 int tc_count; 1204 struct list_head rlist; /* reconnect list */ 1205 spinlock_t tc_lock; /* protect anything here that is not protected */ 1206 atomic_t num_local_opens; /* num of all opens including disconnected */ 1207 atomic_t num_remote_opens; /* num of all network opens on server */ 1208 struct list_head openFileList; 1209 spinlock_t open_file_lock; /* protects list above */ 1210 struct cifs_ses *ses; /* pointer to session associated with */ 1211 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1212 char *nativeFileSystem; 1213 char *password; /* for share-level security */ 1214 __u32 tid; /* The 4 byte tree id */ 1215 __u16 Flags; /* optional support bits */ 1216 enum tid_status_enum status; 1217 atomic_t num_smbs_sent; 1218 union { 1219 struct { 1220 atomic_t num_writes; 1221 atomic_t num_reads; 1222 atomic_t num_flushes; 1223 atomic_t num_oplock_brks; 1224 atomic_t num_opens; 1225 atomic_t num_closes; 1226 atomic_t num_deletes; 1227 atomic_t num_mkdirs; 1228 atomic_t num_posixopens; 1229 atomic_t num_posixmkdirs; 1230 atomic_t num_rmdirs; 1231 atomic_t num_renames; 1232 atomic_t num_t2renames; 1233 atomic_t num_ffirst; 1234 atomic_t num_fnext; 1235 atomic_t num_fclose; 1236 atomic_t num_hardlinks; 1237 atomic_t num_symlinks; 1238 atomic_t num_locks; 1239 atomic_t num_acl_get; 1240 atomic_t num_acl_set; 1241 } cifs_stats; 1242 struct { 1243 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1244 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1245 } smb2_stats; 1246 } stats; 1247 __u64 bytes_read; 1248 __u64 bytes_written; 1249 spinlock_t stat_lock; /* protects the two fields above */ 1250 time64_t stats_from_time; 1251 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1252 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1253 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1254 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1255 bool pipe:1; /* set if connection to pipe share */ 1256 bool print:1; /* set if connection to printer share */ 1257 bool retry:1; 1258 bool nocase:1; 1259 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1260 bool nodelete:1; 1261 bool seal:1; /* transport encryption for this mounted share */ 1262 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1263 for this mount even if server would support */ 1264 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1265 bool local_lease:1; /* check leases (only) on local system not remote */ 1266 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1267 bool broken_sparse_sup; /* if server or share does not support sparse */ 1268 bool need_reconnect:1; /* connection reset, tid now invalid */ 1269 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1270 bool use_resilient:1; /* use resilient instead of durable handles */ 1271 bool use_persistent:1; /* use persistent instead of durable handles */ 1272 bool no_lease:1; /* Do not request leases on files or directories */ 1273 bool use_witness:1; /* use witness protocol */ 1274 __le32 capabilities; 1275 __u32 share_flags; 1276 __u32 maximal_access; 1277 __u32 vol_serial_number; 1278 __le64 vol_create_time; 1279 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1280 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1281 __u32 ss_flags; /* sector size flags */ 1282 __u32 perf_sector_size; /* best sector size for perf */ 1283 __u32 max_chunks; 1284 __u32 max_bytes_chunk; 1285 __u32 max_bytes_copy; 1286 __u32 max_cached_dirs; 1287 #ifdef CONFIG_CIFS_FSCACHE 1288 u64 resource_id; /* server resource id */ 1289 bool fscache_acquired; /* T if we've tried acquiring a cookie */ 1290 struct fscache_volume *fscache; /* cookie for share */ 1291 struct mutex fscache_lock; /* Prevent regetting a cookie */ 1292 #endif 1293 struct list_head pending_opens; /* list of incomplete opens */ 1294 struct cached_fids *cfids; 1295 /* BB add field for back pointer to sb struct(s)? */ 1296 #ifdef CONFIG_CIFS_DFS_UPCALL 1297 struct delayed_work dfs_cache_work; 1298 struct list_head dfs_ses_list; 1299 #endif 1300 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1301 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1302 }; 1303 1304 /* 1305 * This is a refcounted and timestamped container for a tcon pointer. The 1306 * container holds a tcon reference. It is considered safe to free one of 1307 * these when the tl_count goes to 0. The tl_time is the time of the last 1308 * "get" on the container. 1309 */ 1310 struct tcon_link { 1311 struct rb_node tl_rbnode; 1312 kuid_t tl_uid; 1313 unsigned long tl_flags; 1314 #define TCON_LINK_MASTER 0 1315 #define TCON_LINK_PENDING 1 1316 #define TCON_LINK_IN_TREE 2 1317 unsigned long tl_time; 1318 atomic_t tl_count; 1319 struct cifs_tcon *tl_tcon; 1320 }; 1321 1322 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1323 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1324 1325 static inline struct cifs_tcon * 1326 tlink_tcon(struct tcon_link *tlink) 1327 { 1328 return tlink->tl_tcon; 1329 } 1330 1331 static inline struct tcon_link * 1332 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1333 { 1334 return cifs_sb->master_tlink; 1335 } 1336 1337 extern void cifs_put_tlink(struct tcon_link *tlink); 1338 1339 static inline struct tcon_link * 1340 cifs_get_tlink(struct tcon_link *tlink) 1341 { 1342 if (tlink && !IS_ERR(tlink)) 1343 atomic_inc(&tlink->tl_count); 1344 return tlink; 1345 } 1346 1347 /* This function is always expected to succeed */ 1348 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1349 1350 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1351 1352 struct cifs_pending_open { 1353 struct list_head olist; 1354 struct tcon_link *tlink; 1355 __u8 lease_key[16]; 1356 __u32 oplock; 1357 }; 1358 1359 struct cifs_deferred_close { 1360 struct list_head dlist; 1361 struct tcon_link *tlink; 1362 __u16 netfid; 1363 __u64 persistent_fid; 1364 __u64 volatile_fid; 1365 }; 1366 1367 /* 1368 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1369 * This is used to track byte stream locks on the file 1370 */ 1371 struct cifsLockInfo { 1372 struct list_head llist; /* pointer to next cifsLockInfo */ 1373 struct list_head blist; /* pointer to locks blocked on this */ 1374 wait_queue_head_t block_q; 1375 __u64 offset; 1376 __u64 length; 1377 __u32 pid; 1378 __u16 type; 1379 __u16 flags; 1380 }; 1381 1382 /* 1383 * One of these for each open instance of a file 1384 */ 1385 struct cifs_search_info { 1386 loff_t index_of_last_entry; 1387 __u16 entries_in_buffer; 1388 __u16 info_level; 1389 __u32 resume_key; 1390 char *ntwrk_buf_start; 1391 char *srch_entries_start; 1392 char *last_entry; 1393 const char *presume_name; 1394 unsigned int resume_name_len; 1395 bool endOfSearch:1; 1396 bool emptyDir:1; 1397 bool unicode:1; 1398 bool smallBuf:1; /* so we know which buf_release function to call */ 1399 }; 1400 1401 #define ACL_NO_MODE ((umode_t)(-1)) 1402 struct cifs_open_parms { 1403 struct cifs_tcon *tcon; 1404 struct cifs_sb_info *cifs_sb; 1405 int disposition; 1406 int desired_access; 1407 int create_options; 1408 const char *path; 1409 struct cifs_fid *fid; 1410 umode_t mode; 1411 bool reconnect:1; 1412 bool replay:1; /* indicates that this open is for a replay */ 1413 struct kvec *ea_cctx; 1414 }; 1415 1416 struct cifs_fid { 1417 __u16 netfid; 1418 __u64 persistent_fid; /* persist file id for smb2 */ 1419 __u64 volatile_fid; /* volatile file id for smb2 */ 1420 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1421 __u8 create_guid[16]; 1422 __u32 access; 1423 struct cifs_pending_open *pending_open; 1424 unsigned int epoch; 1425 #ifdef CONFIG_CIFS_DEBUG2 1426 __u64 mid; 1427 #endif /* CIFS_DEBUG2 */ 1428 bool purge_cache; 1429 }; 1430 1431 struct cifs_fid_locks { 1432 struct list_head llist; 1433 struct cifsFileInfo *cfile; /* fid that owns locks */ 1434 struct list_head locks; /* locks held by fid above */ 1435 }; 1436 1437 struct cifsFileInfo { 1438 /* following two lists are protected by tcon->open_file_lock */ 1439 struct list_head tlist; /* pointer to next fid owned by tcon */ 1440 struct list_head flist; /* next fid (file instance) for this inode */ 1441 /* lock list below protected by cifsi->lock_sem */ 1442 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1443 kuid_t uid; /* allows finding which FileInfo structure */ 1444 __u32 pid; /* process id who opened file */ 1445 struct cifs_fid fid; /* file id from remote */ 1446 struct list_head rlist; /* reconnect list */ 1447 /* BB add lock scope info here if needed */ 1448 /* lock scope id (0 if none) */ 1449 struct dentry *dentry; 1450 struct tcon_link *tlink; 1451 unsigned int f_flags; 1452 bool invalidHandle:1; /* file closed via session abend */ 1453 bool swapfile:1; 1454 bool oplock_break_cancelled:1; 1455 bool status_file_deleted:1; /* file has been deleted */ 1456 bool offload:1; /* offload final part of _put to a wq */ 1457 unsigned int oplock_epoch; /* epoch from the lease break */ 1458 __u32 oplock_level; /* oplock/lease level from the lease break */ 1459 int count; 1460 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1461 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1462 struct cifs_search_info srch_inf; 1463 struct work_struct oplock_break; /* work for oplock breaks */ 1464 struct work_struct put; /* work for the final part of _put */ 1465 struct work_struct serverclose; /* work for serverclose */ 1466 struct delayed_work deferred; 1467 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1468 char *symlink_target; 1469 }; 1470 1471 struct cifs_io_parms { 1472 __u16 netfid; 1473 __u64 persistent_fid; /* persist file id for smb2 */ 1474 __u64 volatile_fid; /* volatile file id for smb2 */ 1475 __u32 pid; 1476 __u64 offset; 1477 unsigned int length; 1478 struct cifs_tcon *tcon; 1479 struct TCP_Server_Info *server; 1480 }; 1481 1482 struct cifs_io_request { 1483 struct netfs_io_request rreq; 1484 struct cifsFileInfo *cfile; 1485 struct TCP_Server_Info *server; 1486 pid_t pid; 1487 }; 1488 1489 /* asynchronous read support */ 1490 struct cifs_io_subrequest { 1491 union { 1492 struct netfs_io_subrequest subreq; 1493 struct netfs_io_request *rreq; 1494 struct cifs_io_request *req; 1495 }; 1496 ssize_t got_bytes; 1497 unsigned int xid; 1498 int result; 1499 bool have_xid; 1500 bool replay; 1501 struct kvec iov[2]; 1502 struct TCP_Server_Info *server; 1503 #ifdef CONFIG_CIFS_SMB_DIRECT 1504 struct smbd_mr *mr; 1505 #endif 1506 struct cifs_credits credits; 1507 }; 1508 1509 /* 1510 * Take a reference on the file private data. Must be called with 1511 * cfile->file_info_lock held. 1512 */ 1513 static inline void 1514 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1515 { 1516 ++cifs_file->count; 1517 } 1518 1519 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1520 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1521 bool offload); 1522 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1523 1524 #define CIFS_CACHE_READ_FLG 1 1525 #define CIFS_CACHE_HANDLE_FLG 2 1526 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1527 #define CIFS_CACHE_WRITE_FLG 4 1528 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1529 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1530 1531 #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)) 1532 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1533 #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)) 1534 1535 /* 1536 * One of these for each file inode 1537 */ 1538 1539 struct cifsInodeInfo { 1540 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1541 bool can_cache_brlcks; 1542 struct list_head llist; /* locks helb by this inode */ 1543 /* 1544 * NOTE: Some code paths call down_read(lock_sem) twice, so 1545 * we must always use cifs_down_write() instead of down_write() 1546 * for this semaphore to avoid deadlocks. 1547 */ 1548 struct rw_semaphore lock_sem; /* protect the fields above */ 1549 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1550 struct list_head openFileList; 1551 spinlock_t open_file_lock; /* protects openFileList */ 1552 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1553 unsigned int oplock; /* oplock/lease level we have */ 1554 unsigned int epoch; /* used to track lease state changes */ 1555 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1556 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1557 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1558 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1559 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1560 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1561 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1562 unsigned long flags; 1563 spinlock_t writers_lock; 1564 unsigned int writers; /* Number of writers on this inode */ 1565 unsigned long time; /* jiffies of last update of inode */ 1566 u64 uniqueid; /* server inode number */ 1567 u64 createtime; /* creation time on server */ 1568 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1569 struct list_head deferred_closes; /* list of deferred closes */ 1570 spinlock_t deferred_lock; /* protection on deferred list */ 1571 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1572 char *symlink_target; 1573 __u32 reparse_tag; 1574 }; 1575 1576 static inline struct cifsInodeInfo * 1577 CIFS_I(struct inode *inode) 1578 { 1579 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1580 } 1581 1582 static inline struct cifs_sb_info * 1583 CIFS_SB(struct super_block *sb) 1584 { 1585 return sb->s_fs_info; 1586 } 1587 1588 static inline struct cifs_sb_info * 1589 CIFS_FILE_SB(struct file *file) 1590 { 1591 return CIFS_SB(file_inode(file)->i_sb); 1592 } 1593 1594 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1595 { 1596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1597 return '/'; 1598 else 1599 return '\\'; 1600 } 1601 1602 static inline void 1603 convert_delimiter(char *path, char delim) 1604 { 1605 char old_delim, *pos; 1606 1607 if (delim == '/') 1608 old_delim = '\\'; 1609 else 1610 old_delim = '/'; 1611 1612 pos = path; 1613 while ((pos = strchr(pos, old_delim))) 1614 *pos = delim; 1615 } 1616 1617 #define cifs_stats_inc atomic_inc 1618 1619 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1620 unsigned int bytes) 1621 { 1622 if (bytes) { 1623 spin_lock(&tcon->stat_lock); 1624 tcon->bytes_written += bytes; 1625 spin_unlock(&tcon->stat_lock); 1626 } 1627 } 1628 1629 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1630 unsigned int bytes) 1631 { 1632 spin_lock(&tcon->stat_lock); 1633 tcon->bytes_read += bytes; 1634 spin_unlock(&tcon->stat_lock); 1635 } 1636 1637 1638 /* 1639 * This is the prototype for the mid receive function. This function is for 1640 * receiving the rest of the SMB frame, starting with the WordCount (which is 1641 * just after the MID in struct smb_hdr). Note: 1642 * 1643 * - This will be called by cifsd, with no locks held. 1644 * - The mid will still be on the pending_mid_q. 1645 * - mid->resp_buf will point to the current buffer. 1646 * 1647 * Returns zero on a successful receive, or an error. The receive state in 1648 * the TCP_Server_Info will also be updated. 1649 */ 1650 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1651 struct mid_q_entry *mid); 1652 1653 /* 1654 * This is the prototype for the mid callback function. This is called once the 1655 * mid has been received off of the socket. When creating one, take special 1656 * care to avoid deadlocks. Things to bear in mind: 1657 * 1658 * - it will be called by cifsd, with no locks held 1659 * - the mid will be removed from any lists 1660 */ 1661 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1662 1663 /* 1664 * This is the protopyte for mid handle function. This is called once the mid 1665 * has been recognized after decryption of the message. 1666 */ 1667 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1668 struct mid_q_entry *mid); 1669 1670 /* one of these for every pending CIFS request to the server */ 1671 struct mid_q_entry { 1672 struct list_head qhead; /* mids waiting on reply from this server */ 1673 struct kref refcount; 1674 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1675 __u64 mid; /* multiplex id */ 1676 __u16 credits; /* number of credits consumed by this mid */ 1677 __u16 credits_received; /* number of credits from the response */ 1678 __u32 pid; /* process id */ 1679 __u32 sequence_number; /* for CIFS signing */ 1680 unsigned long when_alloc; /* when mid was created */ 1681 #ifdef CONFIG_CIFS_STATS2 1682 unsigned long when_sent; /* time when smb send finished */ 1683 unsigned long when_received; /* when demux complete (taken off wire) */ 1684 #endif 1685 mid_receive_t *receive; /* call receive callback */ 1686 mid_callback_t *callback; /* call completion callback */ 1687 mid_handle_t *handle; /* call handle mid callback */ 1688 void *callback_data; /* general purpose pointer for callback */ 1689 struct task_struct *creator; 1690 void *resp_buf; /* pointer to received SMB header */ 1691 unsigned int resp_buf_size; 1692 int mid_state; /* wish this were enum but can not pass to wait_event */ 1693 unsigned int mid_flags; 1694 __le16 command; /* smb command code */ 1695 unsigned int optype; /* operation type */ 1696 bool large_buf:1; /* if valid response, is pointer to large buf */ 1697 bool multiRsp:1; /* multiple trans2 responses for one request */ 1698 bool multiEnd:1; /* both received */ 1699 bool decrypted:1; /* decrypted entry */ 1700 }; 1701 1702 struct close_cancelled_open { 1703 struct cifs_fid fid; 1704 struct cifs_tcon *tcon; 1705 struct work_struct work; 1706 __u64 mid; 1707 __u16 cmd; 1708 }; 1709 1710 /* Make code in transport.c a little cleaner by moving 1711 update of optional stats into function below */ 1712 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1713 { 1714 atomic_inc(&server->in_send); 1715 } 1716 1717 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1718 { 1719 atomic_dec(&server->in_send); 1720 } 1721 1722 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1723 { 1724 atomic_inc(&server->num_waiters); 1725 } 1726 1727 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1728 { 1729 atomic_dec(&server->num_waiters); 1730 } 1731 1732 #ifdef CONFIG_CIFS_STATS2 1733 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1734 { 1735 mid->when_sent = jiffies; 1736 } 1737 #else 1738 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1739 { 1740 } 1741 #endif 1742 1743 /* for pending dnotify requests */ 1744 struct dir_notify_req { 1745 struct list_head lhead; 1746 __le16 Pid; 1747 __le16 PidHigh; 1748 __u16 Mid; 1749 __u16 Tid; 1750 __u16 Uid; 1751 __u16 netfid; 1752 __u32 filter; /* CompletionFilter (for multishot) */ 1753 int multishot; 1754 struct file *pfile; 1755 }; 1756 1757 struct dfs_info3_param { 1758 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1759 int path_consumed; 1760 int server_type; 1761 int ref_flag; 1762 char *path_name; 1763 char *node_name; 1764 int ttl; 1765 }; 1766 1767 struct file_list { 1768 struct list_head list; 1769 struct cifsFileInfo *cfile; 1770 }; 1771 1772 struct cifs_mount_ctx { 1773 struct cifs_sb_info *cifs_sb; 1774 struct smb3_fs_context *fs_ctx; 1775 unsigned int xid; 1776 struct TCP_Server_Info *server; 1777 struct cifs_ses *ses; 1778 struct cifs_tcon *tcon; 1779 }; 1780 1781 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1782 { 1783 kfree(param->path_name); 1784 kfree(param->node_name); 1785 } 1786 1787 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1788 { 1789 if (param) 1790 __free_dfs_info_param(param); 1791 } 1792 1793 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1794 { 1795 if (param) { 1796 __free_dfs_info_param(param); 1797 memset(param, 0, sizeof(*param)); 1798 } 1799 } 1800 1801 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1802 int number_of_items) 1803 { 1804 int i; 1805 1806 if ((number_of_items == 0) || (param == NULL)) 1807 return; 1808 for (i = 0; i < number_of_items; i++) { 1809 kfree(param[i].path_name); 1810 kfree(param[i].node_name); 1811 } 1812 kfree(param); 1813 } 1814 1815 static inline bool is_interrupt_error(int error) 1816 { 1817 switch (error) { 1818 case -EINTR: 1819 case -ERESTARTSYS: 1820 case -ERESTARTNOHAND: 1821 case -ERESTARTNOINTR: 1822 return true; 1823 } 1824 return false; 1825 } 1826 1827 static inline bool is_retryable_error(int error) 1828 { 1829 if (is_interrupt_error(error) || error == -EAGAIN) 1830 return true; 1831 return false; 1832 } 1833 1834 static inline bool is_replayable_error(int error) 1835 { 1836 if (error == -EAGAIN || error == -ECONNABORTED) 1837 return true; 1838 return false; 1839 } 1840 1841 1842 /* cifs_get_writable_file() flags */ 1843 #define FIND_WR_ANY 0 1844 #define FIND_WR_FSUID_ONLY 1 1845 #define FIND_WR_WITH_DELETE 2 1846 1847 #define MID_FREE 0 1848 #define MID_REQUEST_ALLOCATED 1 1849 #define MID_REQUEST_SUBMITTED 2 1850 #define MID_RESPONSE_RECEIVED 4 1851 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1852 #define MID_RESPONSE_MALFORMED 0x10 1853 #define MID_SHUTDOWN 0x20 1854 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1855 1856 /* Flags */ 1857 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1858 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1859 1860 /* Types of response buffer returned from SendReceive2 */ 1861 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1862 #define CIFS_SMALL_BUFFER 1 1863 #define CIFS_LARGE_BUFFER 2 1864 #define CIFS_IOVEC 4 /* array of response buffers */ 1865 1866 /* Type of Request to SendReceive2 */ 1867 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1868 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1869 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1870 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1871 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1872 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1873 1874 /* Type of request operation */ 1875 #define CIFS_ECHO_OP 0x080 /* echo request */ 1876 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1877 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1878 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1879 /* Lower bitmask values are reserved by others below. */ 1880 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1881 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1882 1883 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1884 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1885 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1886 #define CIFS_COMPRESS_REQ 0x4000 /* compress request before sending */ 1887 1888 /* Security Flags: indicate type of session setup needed */ 1889 #define CIFSSEC_MAY_SIGN 0x00001 1890 #define CIFSSEC_MAY_NTLMV2 0x00004 1891 #define CIFSSEC_MAY_KRB5 0x00008 1892 #define CIFSSEC_MAY_SEAL 0x00040 1893 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1894 1895 #define CIFSSEC_MUST_SIGN 0x01001 1896 /* note that only one of the following can be set so the 1897 result of setting MUST flags more than once will be to 1898 require use of the stronger protocol */ 1899 #define CIFSSEC_MUST_NTLMV2 0x04004 1900 #define CIFSSEC_MUST_KRB5 0x08008 1901 #ifdef CONFIG_CIFS_UPCALL 1902 #define CIFSSEC_MASK 0xCF0CF /* flags supported if no weak allowed */ 1903 #else 1904 #define CIFSSEC_MASK 0xC70C7 /* flags supported if no weak allowed */ 1905 #endif /* UPCALL */ 1906 #define CIFSSEC_MUST_SEAL 0x40040 1907 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1908 1909 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP | CIFSSEC_MAY_SEAL) 1910 #define CIFSSEC_MAX (CIFSSEC_MAY_SIGN | CIFSSEC_MUST_KRB5 | CIFSSEC_MAY_SEAL) 1911 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1912 /* 1913 ***************************************************************** 1914 * All constants go here 1915 ***************************************************************** 1916 */ 1917 1918 #define UID_HASH (16) 1919 1920 /* 1921 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1922 * following to be declared. 1923 */ 1924 1925 /**************************************************************************** 1926 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1927 * to the locking order. i.e. if two locks are to be held together, the lock that 1928 * appears higher in this list needs to be taken before the other. 1929 * 1930 * If you hold a lock that is lower in this list, and you need to take a higher lock 1931 * (or if you think that one of the functions that you're calling may need to), first 1932 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1933 * ensure that locks are picked up only in one direction in the below table 1934 * (top to bottom). 1935 * 1936 * Also, if you expect a function to be called with a lock held, explicitly document 1937 * this in the comments on top of your function definition. 1938 * 1939 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1940 * possible. Blocking / calling other functions with a lock held always increase 1941 * the risk of a possible deadlock. 1942 * 1943 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1944 * debug. Also, any new lock that you introduce, please add to this list in the correct 1945 * order. 1946 * 1947 * Please populate this list whenever you introduce new locks in your changes. Or in 1948 * case I've missed some existing locks. Please ensure that it's added in the list 1949 * based on the locking order expected. 1950 * 1951 * ===================================================================================== 1952 * Lock Protects Initialization fn 1953 * ===================================================================================== 1954 * vol_list_lock 1955 * vol_info->ctx_lock vol_info->ctx 1956 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1957 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1958 * reconnect_mutex 1959 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1960 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1961 * cifs_tcon 1962 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1963 * cifs_tcon->pending_opens 1964 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1965 * cifs_tcon->bytes_written 1966 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1967 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1968 * GlobalCurrentXid 1969 * GlobalTotalActiveXid 1970 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1971 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1972 * ->CurrentMid 1973 * (any changes in mid_q_entry fields) 1974 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1975 * ->credits 1976 * ->echo_credits 1977 * ->oplock_credits 1978 * ->reconnect_instance 1979 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1980 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1981 * ->iface_count 1982 * ->iface_last_update 1983 * cifs_ses->chan_lock cifs_ses->chans 1984 * ->chans_need_reconnect 1985 * ->chans_in_reconnect 1986 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 1987 * inode->i_rwsem, taken by fs/netfs/locking.c e.g. should be taken before cifsInodeInfo locks 1988 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 1989 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 1990 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 1991 * ->can_cache_brlcks 1992 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 1993 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 1994 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 1995 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 1996 * ->invalidHandle initiate_cifs_search 1997 * ->oplock_break_cancelled 1998 ****************************************************************************/ 1999 2000 #ifdef DECLARE_GLOBALS_HERE 2001 #define GLOBAL_EXTERN 2002 #else 2003 #define GLOBAL_EXTERN extern 2004 #endif 2005 2006 /* 2007 * the list of TCP_Server_Info structures, ie each of the sockets 2008 * connecting our client to a distinct server (ip address), is 2009 * chained together by cifs_tcp_ses_list. The list of all our SMB 2010 * sessions (and from that the tree connections) can be found 2011 * by iterating over cifs_tcp_ses_list 2012 */ 2013 extern struct list_head cifs_tcp_ses_list; 2014 2015 /* 2016 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2017 * tcp session, and the list of tcon's per smb session. It also protects 2018 * the reference counters for the server, smb session, and tcon. 2019 * generally the locks should be taken in order tcp_ses_lock before 2020 * tcon->open_file_lock and that before file->file_info_lock since the 2021 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2022 */ 2023 extern spinlock_t cifs_tcp_ses_lock; 2024 2025 /* 2026 * Global transaction id (XID) information 2027 */ 2028 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Lock */ 2029 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Lock */ 2030 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Lock */ 2031 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2032 2033 /* 2034 * Global counters, updated atomically 2035 */ 2036 extern atomic_t sesInfoAllocCount; 2037 extern atomic_t tconInfoAllocCount; 2038 extern atomic_t tcpSesNextId; 2039 extern atomic_t tcpSesAllocCount; 2040 extern atomic_t tcpSesReconnectCount; 2041 extern atomic_t tconInfoReconnectCount; 2042 2043 /* Various Debug counters */ 2044 extern atomic_t buf_alloc_count; /* current number allocated */ 2045 extern atomic_t small_buf_alloc_count; 2046 #ifdef CONFIG_CIFS_STATS2 2047 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2048 extern atomic_t total_small_buf_alloc_count; 2049 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2050 #endif 2051 2052 /* Misc globals */ 2053 extern bool enable_oplocks; /* enable or disable oplocks */ 2054 extern bool lookupCacheEnabled; 2055 extern unsigned int global_secflags; /* if on, session setup sent 2056 with more secure ntlmssp2 challenge/resp */ 2057 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2058 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2059 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2060 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2061 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2062 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2063 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2064 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2065 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2066 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2067 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2068 extern atomic_t mid_count; 2069 2070 void cifs_oplock_break(struct work_struct *work); 2071 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2072 void smb2_deferred_work_close(struct work_struct *work); 2073 2074 extern const struct slow_work_ops cifs_oplock_break_ops; 2075 extern struct workqueue_struct *cifsiod_wq; 2076 extern struct workqueue_struct *decrypt_wq; 2077 extern struct workqueue_struct *fileinfo_put_wq; 2078 extern struct workqueue_struct *cifsoplockd_wq; 2079 extern struct workqueue_struct *deferredclose_wq; 2080 extern struct workqueue_struct *serverclose_wq; 2081 extern __u32 cifs_lock_secret; 2082 2083 extern mempool_t *cifs_sm_req_poolp; 2084 extern mempool_t *cifs_req_poolp; 2085 extern mempool_t *cifs_mid_poolp; 2086 extern mempool_t cifs_io_request_pool; 2087 extern mempool_t cifs_io_subrequest_pool; 2088 2089 /* Operations for different SMB versions */ 2090 #define SMB1_VERSION_STRING "1.0" 2091 #define SMB20_VERSION_STRING "2.0" 2092 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2093 extern struct smb_version_operations smb1_operations; 2094 extern struct smb_version_values smb1_values; 2095 extern struct smb_version_operations smb20_operations; 2096 extern struct smb_version_values smb20_values; 2097 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2098 #define SMB21_VERSION_STRING "2.1" 2099 extern struct smb_version_operations smb21_operations; 2100 extern struct smb_version_values smb21_values; 2101 #define SMBDEFAULT_VERSION_STRING "default" 2102 extern struct smb_version_values smbdefault_values; 2103 #define SMB3ANY_VERSION_STRING "3" 2104 extern struct smb_version_values smb3any_values; 2105 #define SMB30_VERSION_STRING "3.0" 2106 extern struct smb_version_operations smb30_operations; 2107 extern struct smb_version_values smb30_values; 2108 #define SMB302_VERSION_STRING "3.02" 2109 #define ALT_SMB302_VERSION_STRING "3.0.2" 2110 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2111 extern struct smb_version_values smb302_values; 2112 #define SMB311_VERSION_STRING "3.1.1" 2113 #define ALT_SMB311_VERSION_STRING "3.11" 2114 extern struct smb_version_operations smb311_operations; 2115 extern struct smb_version_values smb311_values; 2116 2117 static inline char *get_security_type_str(enum securityEnum sectype) 2118 { 2119 switch (sectype) { 2120 case RawNTLMSSP: 2121 return "RawNTLMSSP"; 2122 case Kerberos: 2123 return "Kerberos"; 2124 case NTLMv2: 2125 return "NTLMv2"; 2126 default: 2127 return "Unknown"; 2128 } 2129 } 2130 2131 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2132 { 2133 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2134 } 2135 2136 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2137 { 2138 /* 2139 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2140 * Subsystem Notifies That a Share Is a DFS Share. 2141 * 2142 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2143 * Application Updates a Share. 2144 */ 2145 if (!tcon || !tcon->ses || !tcon->ses->server) 2146 return false; 2147 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2148 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2149 } 2150 2151 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2152 const struct dfs_info3_param *ref) 2153 { 2154 /* 2155 * Check if all targets are capable of handling DFS referrals as per 2156 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2157 */ 2158 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2159 } 2160 2161 static inline u64 cifs_flock_len(const struct file_lock *fl) 2162 { 2163 return (u64)fl->fl_end - fl->fl_start + 1; 2164 } 2165 2166 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2167 { 2168 if (WARN_ON_ONCE(!ses || !ses->server)) 2169 return 0; 2170 /* 2171 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2172 * servers do require it during NTLMSSP. 2173 */ 2174 if (ses->server->dialect <= SMB20_PROT_ID) 2175 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2176 return sizeof(ses->workstation_name); 2177 } 2178 2179 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2180 { 2181 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2182 dst->AccessFlags = src->AccessFlags; 2183 dst->CurrentByteOffset = src->CurrentByteOffset; 2184 dst->Mode = src->Mode; 2185 dst->AlignmentRequirement = src->AlignmentRequirement; 2186 dst->FileNameLength = src->FileNameLength; 2187 } 2188 2189 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2190 int num_rqst, 2191 const u8 *sig) 2192 { 2193 unsigned int len, skip; 2194 unsigned int nents = 0; 2195 unsigned long addr; 2196 size_t data_size; 2197 int i, j; 2198 2199 /* 2200 * The first rqst has a transform header where the first 20 bytes are 2201 * not part of the encrypted blob. 2202 */ 2203 skip = 20; 2204 2205 /* Assumes the first rqst has a transform header as the first iov. 2206 * I.e. 2207 * rqst[0].rq_iov[0] is transform header 2208 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2209 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2210 */ 2211 for (i = 0; i < num_rqst; i++) { 2212 data_size = iov_iter_count(&rqst[i].rq_iter); 2213 2214 /* We really don't want a mixture of pinned and unpinned pages 2215 * in the sglist. It's hard to keep track of which is what. 2216 * Instead, we convert to a BVEC-type iterator higher up. 2217 */ 2218 if (data_size && 2219 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2220 return -EIO; 2221 2222 /* We also don't want to have any extra refs or pins to clean 2223 * up in the sglist. 2224 */ 2225 if (data_size && 2226 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2227 return -EIO; 2228 2229 for (j = 0; j < rqst[i].rq_nvec; j++) { 2230 struct kvec *iov = &rqst[i].rq_iov[j]; 2231 2232 addr = (unsigned long)iov->iov_base + skip; 2233 if (is_vmalloc_or_module_addr((void *)addr)) { 2234 len = iov->iov_len - skip; 2235 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2236 PAGE_SIZE); 2237 } else { 2238 nents++; 2239 } 2240 skip = 0; 2241 } 2242 if (data_size) 2243 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2244 } 2245 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2246 return nents; 2247 } 2248 2249 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2250 * stack object as buf. 2251 */ 2252 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2253 const void *buf, 2254 unsigned int buflen) 2255 { 2256 unsigned long addr = (unsigned long)buf; 2257 unsigned int off = offset_in_page(addr); 2258 2259 addr &= PAGE_MASK; 2260 if (is_vmalloc_or_module_addr((void *)addr)) { 2261 do { 2262 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2263 2264 sg_set_page(&sgtable->sgl[sgtable->nents++], 2265 vmalloc_to_page((void *)addr), len, off); 2266 2267 off = 0; 2268 addr += PAGE_SIZE; 2269 buflen -= len; 2270 } while (buflen); 2271 } else { 2272 sg_set_page(&sgtable->sgl[sgtable->nents++], 2273 virt_to_page((void *)addr), buflen, off); 2274 } 2275 } 2276 2277 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2278 ((struct cifs_open_parms) { \ 2279 .tcon = _tcon, \ 2280 .path = _path, \ 2281 .desired_access = (_da), \ 2282 .disposition = (_cd), \ 2283 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2284 .mode = (_mode), \ 2285 .cifs_sb = _cifs_sb, \ 2286 }) 2287 2288 struct smb2_compound_vars { 2289 struct cifs_open_parms oparms; 2290 struct kvec rsp_iov[MAX_COMPOUND]; 2291 struct smb_rqst rqst[MAX_COMPOUND]; 2292 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2293 struct kvec qi_iov; 2294 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2295 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2296 struct kvec close_iov; 2297 struct smb2_file_rename_info rename_info; 2298 struct smb2_file_link_info link_info; 2299 struct kvec ea_iov; 2300 }; 2301 2302 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2303 { 2304 bool ret; 2305 2306 spin_lock(&ses->ses_lock); 2307 ret = ses->ses_status == SES_EXITING; 2308 spin_unlock(&ses->ses_lock); 2309 return ret; 2310 } 2311 2312 #endif /* _CIFS_GLOB_H */ 2313