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_readdata; 272 struct cifs_writedata; 273 struct cifs_io_parms; 274 struct cifs_search_info; 275 struct cifsInodeInfo; 276 struct cifs_open_parms; 277 struct cifs_credits; 278 279 struct smb_version_operations { 280 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 281 struct mid_q_entry *); 282 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 283 /* setup request: allocate mid, sign message */ 284 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 285 struct TCP_Server_Info *, 286 struct smb_rqst *); 287 /* setup async request: allocate mid, sign message */ 288 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 289 struct smb_rqst *); 290 /* check response: verify signature, map error */ 291 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 292 bool); 293 void (*add_credits)(struct TCP_Server_Info *server, 294 const struct cifs_credits *credits, 295 const int optype); 296 void (*set_credits)(struct TCP_Server_Info *, const int); 297 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 298 unsigned int (*get_credits)(struct mid_q_entry *); 299 __u64 (*get_next_mid)(struct TCP_Server_Info *); 300 void (*revert_current_mid)(struct TCP_Server_Info *server, 301 const unsigned int val); 302 /* data offset from read response message */ 303 unsigned int (*read_data_offset)(char *); 304 /* 305 * Data length from read response message 306 * When in_remaining is true, the returned data length is in 307 * message field DataRemaining for out-of-band data read (e.g through 308 * Memory Registration RDMA write in SMBD). 309 * Otherwise, the returned data length is in message field DataLength. 310 */ 311 unsigned int (*read_data_length)(char *, bool in_remaining); 312 /* map smb to linux error */ 313 int (*map_error)(char *, bool); 314 /* find mid corresponding to the response message */ 315 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 316 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 317 void (*clear_stats)(struct cifs_tcon *); 318 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 319 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 320 /* verify the message */ 321 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 322 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 323 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 324 void (*downgrade_oplock)(struct TCP_Server_Info *server, 325 struct cifsInodeInfo *cinode, __u32 oplock, 326 unsigned int epoch, bool *purge_cache); 327 /* process transaction2 response */ 328 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 329 char *, int); 330 /* check if we need to negotiate */ 331 bool (*need_neg)(struct TCP_Server_Info *); 332 /* negotiate to the server */ 333 int (*negotiate)(const unsigned int xid, 334 struct cifs_ses *ses, 335 struct TCP_Server_Info *server); 336 /* set negotiated write size */ 337 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 338 /* set negotiated read size */ 339 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 340 /* setup smb sessionn */ 341 int (*sess_setup)(const unsigned int, struct cifs_ses *, 342 struct TCP_Server_Info *server, 343 const struct nls_table *); 344 /* close smb session */ 345 int (*logoff)(const unsigned int, struct cifs_ses *); 346 /* connect to a server share */ 347 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 348 struct cifs_tcon *, const struct nls_table *); 349 /* close tree connecion */ 350 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 351 /* get DFS referrals */ 352 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 353 const char *, struct dfs_info3_param **, 354 unsigned int *, const struct nls_table *, int); 355 /* informational QFS call */ 356 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 357 struct cifs_sb_info *); 358 /* check if a path is accessible or not */ 359 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 360 struct cifs_sb_info *, const char *); 361 /* query path data from the server */ 362 int (*query_path_info)(const unsigned int xid, 363 struct cifs_tcon *tcon, 364 struct cifs_sb_info *cifs_sb, 365 const char *full_path, 366 struct cifs_open_info_data *data); 367 /* query file data from the server */ 368 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 369 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 370 /* query reparse point to determine which type of special file */ 371 int (*query_reparse_point)(const unsigned int xid, 372 struct cifs_tcon *tcon, 373 struct cifs_sb_info *cifs_sb, 374 const char *full_path, 375 u32 *tag, struct kvec *rsp, 376 int *rsp_buftype); 377 /* get server index number */ 378 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 379 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 380 struct cifs_open_info_data *data); 381 /* set size by path */ 382 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 383 const char *, __u64, struct cifs_sb_info *, bool, 384 struct dentry *); 385 /* set size by file handle */ 386 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 387 struct cifsFileInfo *, __u64, bool); 388 /* set attributes */ 389 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 390 const unsigned int); 391 int (*set_compression)(const unsigned int, struct cifs_tcon *, 392 struct cifsFileInfo *); 393 /* check if we can send an echo or nor */ 394 bool (*can_echo)(struct TCP_Server_Info *); 395 /* send echo request */ 396 int (*echo)(struct TCP_Server_Info *); 397 /* create directory */ 398 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 399 umode_t mode, struct cifs_tcon *tcon, 400 const char *full_path, 401 struct cifs_sb_info *cifs_sb); 402 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 403 struct cifs_tcon *tcon, const char *name, 404 struct cifs_sb_info *sb); 405 /* set info on created directory */ 406 void (*mkdir_setinfo)(struct inode *, const char *, 407 struct cifs_sb_info *, struct cifs_tcon *, 408 const unsigned int); 409 /* remove directory */ 410 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 411 struct cifs_sb_info *); 412 /* unlink file */ 413 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 414 struct cifs_sb_info *, struct dentry *); 415 /* open, rename and delete file */ 416 int (*rename_pending_delete)(const char *, struct dentry *, 417 const unsigned int); 418 /* send rename request */ 419 int (*rename)(const unsigned int xid, 420 struct cifs_tcon *tcon, 421 struct dentry *source_dentry, 422 const char *from_name, const char *to_name, 423 struct cifs_sb_info *cifs_sb); 424 /* send create hardlink request */ 425 int (*create_hardlink)(const unsigned int xid, 426 struct cifs_tcon *tcon, 427 struct dentry *source_dentry, 428 const char *from_name, const char *to_name, 429 struct cifs_sb_info *cifs_sb); 430 /* query symlink target */ 431 int (*query_symlink)(const unsigned int xid, 432 struct cifs_tcon *tcon, 433 struct cifs_sb_info *cifs_sb, 434 const char *full_path, 435 char **target_path); 436 /* open a file for non-posix mounts */ 437 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 438 void *buf); 439 /* set fid protocol-specific info */ 440 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 441 /* close a file */ 442 void (*close)(const unsigned int, struct cifs_tcon *, 443 struct cifs_fid *); 444 /* close a file, returning file attributes and timestamps */ 445 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 446 struct cifsFileInfo *pfile_info); 447 /* send a flush request to the server */ 448 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 449 /* async read from the server */ 450 int (*async_readv)(struct cifs_readdata *); 451 /* async write to the server */ 452 int (*async_writev)(struct cifs_writedata *, 453 void (*release)(struct kref *)); 454 /* sync read from the server */ 455 int (*sync_read)(const unsigned int, struct cifs_fid *, 456 struct cifs_io_parms *, unsigned int *, char **, 457 int *); 458 /* sync write to the server */ 459 int (*sync_write)(const unsigned int, struct cifs_fid *, 460 struct cifs_io_parms *, unsigned int *, struct kvec *, 461 unsigned long); 462 /* open dir, start readdir */ 463 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 464 const char *, struct cifs_sb_info *, 465 struct cifs_fid *, __u16, 466 struct cifs_search_info *); 467 /* continue readdir */ 468 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 469 struct cifs_fid *, 470 __u16, struct cifs_search_info *srch_inf); 471 /* close dir */ 472 int (*close_dir)(const unsigned int, struct cifs_tcon *, 473 struct cifs_fid *); 474 /* calculate a size of SMB message */ 475 unsigned int (*calc_smb_size)(void *buf); 476 /* check for STATUS_PENDING and process the response if yes */ 477 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 478 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 479 bool (*is_session_expired)(char *); 480 /* send oplock break response */ 481 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 482 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 483 /* query remote filesystem */ 484 int (*queryfs)(const unsigned int, struct cifs_tcon *, 485 struct cifs_sb_info *, struct kstatfs *); 486 /* send mandatory brlock to the server */ 487 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 488 __u64, __u32, int, int, bool); 489 /* unlock range of mandatory locks */ 490 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 491 const unsigned int); 492 /* push brlocks from the cache to the server */ 493 int (*push_mand_locks)(struct cifsFileInfo *); 494 /* get lease key of the inode */ 495 void (*get_lease_key)(struct inode *, struct cifs_fid *); 496 /* set lease key of the inode */ 497 void (*set_lease_key)(struct inode *, struct cifs_fid *); 498 /* generate new lease key */ 499 void (*new_lease_key)(struct cifs_fid *); 500 int (*generate_signingkey)(struct cifs_ses *ses, 501 struct TCP_Server_Info *server); 502 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 503 bool allocate_crypto); 504 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 505 struct cifsFileInfo *src_file); 506 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 507 struct cifsFileInfo *src_file, void __user *); 508 int (*notify)(const unsigned int xid, struct file *pfile, 509 void __user *pbuf, bool return_changes); 510 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 511 struct cifs_sb_info *, const unsigned char *, 512 char *, unsigned int *); 513 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 514 struct cifs_sb_info *, const unsigned char *, 515 char *, unsigned int *); 516 /* if we can do cache read operations */ 517 bool (*is_read_op)(__u32); 518 /* set oplock level for the inode */ 519 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 520 bool *); 521 /* create lease context buffer for CREATE request */ 522 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 523 /* parse lease context buffer and return oplock/epoch info */ 524 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 525 ssize_t (*copychunk_range)(const unsigned int, 526 struct cifsFileInfo *src_file, 527 struct cifsFileInfo *target_file, 528 u64 src_off, u64 len, u64 dest_off); 529 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 530 struct cifsFileInfo *target_file, u64 src_off, u64 len, 531 u64 dest_off); 532 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 533 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 534 const unsigned char *, const unsigned char *, char *, 535 size_t, struct cifs_sb_info *); 536 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 537 const char *, const void *, const __u16, 538 const struct nls_table *, struct cifs_sb_info *); 539 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 540 const char *, u32 *, u32); 541 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 542 const struct cifs_fid *, u32 *, u32); 543 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 544 int); 545 /* writepages retry size */ 546 unsigned int (*wp_retry_size)(struct inode *); 547 /* get mtu credits */ 548 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 549 unsigned int *, struct cifs_credits *); 550 /* adjust previously taken mtu credits to request size */ 551 int (*adjust_credits)(struct TCP_Server_Info *server, 552 struct cifs_credits *credits, 553 const unsigned int payload_size); 554 /* check if we need to issue closedir */ 555 bool (*dir_needs_close)(struct cifsFileInfo *); 556 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 557 loff_t); 558 /* init transform request - used for encryption for now */ 559 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 560 struct smb_rqst *, struct smb_rqst *); 561 int (*is_transform_hdr)(void *buf); 562 int (*receive_transform)(struct TCP_Server_Info *, 563 struct mid_q_entry **, char **, int *); 564 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 565 enum securityEnum); 566 int (*next_header)(struct TCP_Server_Info *server, char *buf, 567 unsigned int *noff); 568 /* ioctl passthrough for query_info */ 569 int (*ioctl_query_info)(const unsigned int xid, 570 struct cifs_tcon *tcon, 571 struct cifs_sb_info *cifs_sb, 572 __le16 *path, int is_dir, 573 unsigned long p); 574 /* make unix special files (block, char, fifo, socket) */ 575 int (*make_node)(unsigned int xid, 576 struct inode *inode, 577 struct dentry *dentry, 578 struct cifs_tcon *tcon, 579 const char *full_path, 580 umode_t mode, 581 dev_t device_number); 582 /* version specific fiemap implementation */ 583 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 584 struct fiemap_extent_info *, u64, u64); 585 /* version specific llseek implementation */ 586 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 587 /* Check for STATUS_IO_TIMEOUT */ 588 bool (*is_status_io_timeout)(char *buf); 589 /* Check for STATUS_NETWORK_NAME_DELETED */ 590 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 591 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 592 struct kvec *rsp_iov, 593 struct cifs_open_info_data *data); 594 int (*create_reparse_symlink)(const unsigned int xid, 595 struct inode *inode, 596 struct dentry *dentry, 597 struct cifs_tcon *tcon, 598 const char *full_path, 599 const char *symname); 600 }; 601 602 struct smb_version_values { 603 char *version_string; 604 __u16 protocol_id; 605 __u32 req_capabilities; 606 __u32 large_lock_type; 607 __u32 exclusive_lock_type; 608 __u32 shared_lock_type; 609 __u32 unlock_lock_type; 610 size_t header_preamble_size; 611 size_t header_size; 612 size_t max_header_size; 613 size_t read_rsp_size; 614 __le16 lock_cmd; 615 unsigned int cap_unix; 616 unsigned int cap_nt_find; 617 unsigned int cap_large_files; 618 __u16 signing_enabled; 619 __u16 signing_required; 620 size_t create_lease_size; 621 }; 622 623 #define HEADER_SIZE(server) (server->vals->header_size) 624 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 625 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 626 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 627 628 /** 629 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 630 * trying to reuse existing superblock for a new mount 631 */ 632 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 633 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 634 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 635 CIFS_MOUNT_MAP_SFM_CHR | \ 636 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 637 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 638 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 639 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 640 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 641 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 642 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 643 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 644 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 645 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 646 647 /** 648 * Generic VFS superblock mount flags (s_flags) to consider when 649 * trying to reuse existing superblock for a new mount 650 */ 651 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 652 SB_NODEV | SB_SYNCHRONOUS) 653 654 struct cifs_mnt_data { 655 struct cifs_sb_info *cifs_sb; 656 struct smb3_fs_context *ctx; 657 int flags; 658 }; 659 660 static inline unsigned int 661 get_rfc1002_length(void *buf) 662 { 663 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 664 } 665 666 static inline void 667 inc_rfc1001_len(void *buf, int count) 668 { 669 be32_add_cpu((__be32 *)buf, count); 670 } 671 672 struct TCP_Server_Info { 673 struct list_head tcp_ses_list; 674 struct list_head smb_ses_list; 675 spinlock_t srv_lock; /* protect anything here that is not protected */ 676 __u64 conn_id; /* connection identifier (useful for debugging) */ 677 int srv_count; /* reference counter */ 678 /* 15 character server name + 0x20 16th byte indicating type = srv */ 679 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 680 struct smb_version_operations *ops; 681 struct smb_version_values *vals; 682 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 683 enum statusEnum tcpStatus; /* what we think the status is */ 684 char *hostname; /* hostname portion of UNC string */ 685 struct socket *ssocket; 686 struct sockaddr_storage dstaddr; 687 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 688 #ifdef CONFIG_NET_NS 689 struct net *net; 690 #endif 691 wait_queue_head_t response_q; 692 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 693 spinlock_t mid_lock; /* protect mid queue and it's entries */ 694 struct list_head pending_mid_q; 695 bool noblocksnd; /* use blocking sendmsg */ 696 bool noautotune; /* do not autotune send buf sizes */ 697 bool nosharesock; 698 bool tcp_nodelay; 699 bool terminate; 700 unsigned int credits; /* send no more requests at once */ 701 unsigned int max_credits; /* can override large 32000 default at mnt */ 702 unsigned int in_flight; /* number of requests on the wire to server */ 703 unsigned int max_in_flight; /* max number of requests that were on wire */ 704 spinlock_t req_lock; /* protect the two values above */ 705 struct mutex _srv_mutex; 706 unsigned int nofs_flag; 707 struct task_struct *tsk; 708 char server_GUID[16]; 709 __u16 sec_mode; 710 bool sign; /* is signing enabled on this connection? */ 711 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 712 bool session_estab; /* mark when very first sess is established */ 713 int echo_credits; /* echo reserved slots */ 714 int oplock_credits; /* oplock break reserved slots */ 715 bool echoes:1; /* enable echoes */ 716 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 717 u16 dialect; /* dialect index that server chose */ 718 bool oplocks:1; /* enable oplocks */ 719 unsigned int maxReq; /* Clients should submit no more */ 720 /* than maxReq distinct unanswered SMBs to the server when using */ 721 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 722 unsigned int maxBuf; /* maxBuf specifies the maximum */ 723 /* message size the server can send or receive for non-raw SMBs */ 724 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 725 /* when socket is setup (and during reconnect) before NegProt sent */ 726 unsigned int max_rw; /* maxRw specifies the maximum */ 727 /* message size the server can send or receive for */ 728 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 729 unsigned int capabilities; /* selective disabling of caps by smb sess */ 730 int timeAdj; /* Adjust for difference in server time zone in sec */ 731 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 732 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 733 /* 16th byte of RFC1001 workstation name is always null */ 734 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 735 __u32 sequence_number; /* for signing, protected by srv_mutex */ 736 __u32 reconnect_instance; /* incremented on each reconnect */ 737 struct session_key session_key; 738 unsigned long lstrp; /* when we got last response from this server */ 739 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 740 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 741 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 742 char negflavor; /* NEGOTIATE response flavor */ 743 /* extended security flavors that server supports */ 744 bool sec_ntlmssp; /* supports NTLMSSP */ 745 bool sec_kerberosu2u; /* supports U2U Kerberos */ 746 bool sec_kerberos; /* supports plain Kerberos */ 747 bool sec_mskerberos; /* supports legacy MS Kerberos */ 748 bool large_buf; /* is current buffer large? */ 749 /* use SMBD connection instead of socket */ 750 bool rdma; 751 /* point to the SMBD connection if RDMA is used instead of socket */ 752 struct smbd_connection *smbd_conn; 753 struct delayed_work echo; /* echo ping workqueue job */ 754 char *smallbuf; /* pointer to current "small" buffer */ 755 char *bigbuf; /* pointer to current "big" buffer */ 756 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 757 unsigned int pdu_size; 758 unsigned int total_read; /* total amount of data read in this pass */ 759 atomic_t in_send; /* requests trying to send */ 760 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 761 #ifdef CONFIG_CIFS_STATS2 762 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 763 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 764 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 765 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 766 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 767 #endif /* STATS2 */ 768 unsigned int max_read; 769 unsigned int max_write; 770 unsigned int min_offload; 771 unsigned int retrans; 772 struct { 773 bool requested; /* "compress" mount option set*/ 774 bool enabled; /* actually negotiated with server */ 775 __le16 alg; /* preferred alg negotiated with server */ 776 } compression; 777 __u16 signing_algorithm; 778 __le16 cipher_type; 779 /* save initital negprot hash */ 780 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 781 bool signing_negotiated; /* true if valid signing context rcvd from server */ 782 bool posix_ext_supported; 783 struct delayed_work reconnect; /* reconnect workqueue job */ 784 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 785 unsigned long echo_interval; 786 787 /* 788 * Number of targets available for reconnect. The more targets 789 * the more tasks have to wait to let the demultiplex thread 790 * reconnect. 791 */ 792 int nr_targets; 793 bool noblockcnt; /* use non-blocking connect() */ 794 795 /* 796 * If this is a session channel, 797 * primary_server holds the ref-counted 798 * pointer to primary channel connection for the session. 799 */ 800 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 801 struct TCP_Server_Info *primary_server; 802 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 803 804 #ifdef CONFIG_CIFS_SWN_UPCALL 805 bool use_swn_dstaddr; 806 struct sockaddr_storage swn_dstaddr; 807 #endif 808 struct mutex refpath_lock; /* protects leaf_fullpath */ 809 /* 810 * leaf_fullpath: Canonical DFS referral path related to this 811 * connection. 812 * It is used in DFS cache refresher, reconnect and may 813 * change due to nested DFS links. 814 * 815 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 816 * mostly used for not requiring a copy of @leaf_fullpath when getting 817 * cached or new DFS referrals (which might also sleep during I/O). 818 * While @srv_lock is held for making string and NULL comparions against 819 * both fields as in mount(2) and cache refresh. 820 * 821 * format: \\HOST\SHARE[\OPTIONAL PATH] 822 */ 823 char *leaf_fullpath; 824 }; 825 826 static inline bool is_smb1(struct TCP_Server_Info *server) 827 { 828 return HEADER_PREAMBLE_SIZE(server) != 0; 829 } 830 831 static inline void cifs_server_lock(struct TCP_Server_Info *server) 832 { 833 unsigned int nofs_flag = memalloc_nofs_save(); 834 835 mutex_lock(&server->_srv_mutex); 836 server->nofs_flag = nofs_flag; 837 } 838 839 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 840 { 841 unsigned int nofs_flag = server->nofs_flag; 842 843 mutex_unlock(&server->_srv_mutex); 844 memalloc_nofs_restore(nofs_flag); 845 } 846 847 struct cifs_credits { 848 unsigned int value; 849 unsigned int instance; 850 }; 851 852 static inline unsigned int 853 in_flight(struct TCP_Server_Info *server) 854 { 855 unsigned int num; 856 857 spin_lock(&server->req_lock); 858 num = server->in_flight; 859 spin_unlock(&server->req_lock); 860 return num; 861 } 862 863 static inline bool 864 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 865 { 866 int num; 867 868 spin_lock(&server->req_lock); 869 num = *credits; 870 spin_unlock(&server->req_lock); 871 return num >= num_credits; 872 } 873 874 static inline void 875 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 876 const int optype) 877 { 878 server->ops->add_credits(server, credits, optype); 879 } 880 881 static inline void 882 add_credits_and_wake_if(struct TCP_Server_Info *server, 883 const struct cifs_credits *credits, const int optype) 884 { 885 if (credits->value) { 886 server->ops->add_credits(server, credits, optype); 887 wake_up(&server->request_q); 888 } 889 } 890 891 static inline void 892 set_credits(struct TCP_Server_Info *server, const int val) 893 { 894 server->ops->set_credits(server, val); 895 } 896 897 static inline int 898 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 899 const unsigned int payload_size) 900 { 901 return server->ops->adjust_credits ? 902 server->ops->adjust_credits(server, credits, payload_size) : 0; 903 } 904 905 static inline __le64 906 get_next_mid64(struct TCP_Server_Info *server) 907 { 908 return cpu_to_le64(server->ops->get_next_mid(server)); 909 } 910 911 static inline __le16 912 get_next_mid(struct TCP_Server_Info *server) 913 { 914 __u16 mid = server->ops->get_next_mid(server); 915 /* 916 * The value in the SMB header should be little endian for easy 917 * on-the-wire decoding. 918 */ 919 return cpu_to_le16(mid); 920 } 921 922 static inline void 923 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 924 { 925 if (server->ops->revert_current_mid) 926 server->ops->revert_current_mid(server, val); 927 } 928 929 static inline void 930 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 931 const struct smb2_hdr *shdr) 932 { 933 unsigned int num = le16_to_cpu(shdr->CreditCharge); 934 935 return revert_current_mid(server, num > 0 ? num : 1); 936 } 937 938 static inline __u16 939 get_mid(const struct smb_hdr *smb) 940 { 941 return le16_to_cpu(smb->Mid); 942 } 943 944 static inline bool 945 compare_mid(__u16 mid, const struct smb_hdr *smb) 946 { 947 return mid == le16_to_cpu(smb->Mid); 948 } 949 950 /* 951 * When the server supports very large reads and writes via POSIX extensions, 952 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 953 * including the RFC1001 length. 954 * 955 * Note that this might make for "interesting" allocation problems during 956 * writeback however as we have to allocate an array of pointers for the 957 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 958 * 959 * For reads, there is a similar problem as we need to allocate an array 960 * of kvecs to handle the receive, though that should only need to be done 961 * once. 962 */ 963 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 964 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 965 966 /* 967 * When the server doesn't allow large posix writes, only allow a rsize/wsize 968 * of 2^17-1 minus the size of the call header. That allows for a read or 969 * write up to the maximum size described by RFC1002. 970 */ 971 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 972 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 973 974 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 975 976 /* 977 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 978 * those values when posix extensions aren't in force. In actuality here, we 979 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 980 * to be ok with the extra byte even though Windows doesn't send writes that 981 * are that large. 982 * 983 * Citation: 984 * 985 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 986 */ 987 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 988 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 989 990 /* 991 * Macros to allow the TCP_Server_Info->net field and related code to drop out 992 * when CONFIG_NET_NS isn't set. 993 */ 994 995 #ifdef CONFIG_NET_NS 996 997 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 998 { 999 return srv->net; 1000 } 1001 1002 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1003 { 1004 srv->net = net; 1005 } 1006 1007 #else 1008 1009 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1010 { 1011 return &init_net; 1012 } 1013 1014 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1015 { 1016 } 1017 1018 #endif 1019 1020 struct cifs_server_iface { 1021 struct list_head iface_head; 1022 struct kref refcount; 1023 size_t speed; 1024 size_t weight_fulfilled; 1025 unsigned int num_channels; 1026 unsigned int rdma_capable : 1; 1027 unsigned int rss_capable : 1; 1028 unsigned int is_active : 1; /* unset if non existent */ 1029 struct sockaddr_storage sockaddr; 1030 }; 1031 1032 /* release iface when last ref is dropped */ 1033 static inline void 1034 release_iface(struct kref *ref) 1035 { 1036 struct cifs_server_iface *iface = container_of(ref, 1037 struct cifs_server_iface, 1038 refcount); 1039 kfree(iface); 1040 } 1041 1042 struct cifs_chan { 1043 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1044 struct TCP_Server_Info *server; 1045 struct cifs_server_iface *iface; /* interface in use */ 1046 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1047 }; 1048 1049 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1050 1051 /* 1052 * Session structure. One of these for each uid session with a particular host 1053 */ 1054 struct cifs_ses { 1055 struct list_head smb_ses_list; 1056 struct list_head rlist; /* reconnect list */ 1057 struct list_head tcon_list; 1058 struct cifs_tcon *tcon_ipc; 1059 spinlock_t ses_lock; /* protect anything here that is not protected */ 1060 struct mutex session_mutex; 1061 struct TCP_Server_Info *server; /* pointer to server info */ 1062 int ses_count; /* reference counter */ 1063 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1064 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1065 char *serverOS; /* name of operating system underlying server */ 1066 char *serverNOS; /* name of network operating system of server */ 1067 char *serverDomain; /* security realm of server */ 1068 __u64 Suid; /* remote smb uid */ 1069 kuid_t linux_uid; /* overriding owner of files on the mount */ 1070 kuid_t cred_uid; /* owner of credentials */ 1071 unsigned int capabilities; 1072 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1073 char *user_name; /* must not be null except during init of sess 1074 and after mount option parsing we fill it */ 1075 char *domainName; 1076 char *password; 1077 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1078 struct session_key auth_key; 1079 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1080 enum securityEnum sectype; /* what security flavor was specified? */ 1081 bool sign; /* is signing required? */ 1082 bool domainAuto:1; 1083 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1084 unsigned int flags; 1085 __u16 session_flags; 1086 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1087 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1088 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1089 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1090 1091 /* 1092 * Network interfaces available on the server this session is 1093 * connected to. 1094 * 1095 * Other channels can be opened by connecting and binding this 1096 * session to interfaces from this list. 1097 * 1098 * iface_lock should be taken when accessing any of these fields 1099 */ 1100 spinlock_t iface_lock; 1101 /* ========= begin: protected by iface_lock ======== */ 1102 struct list_head iface_list; 1103 size_t iface_count; 1104 unsigned long iface_last_update; /* jiffies */ 1105 /* ========= end: protected by iface_lock ======== */ 1106 1107 spinlock_t chan_lock; 1108 /* ========= begin: protected by chan_lock ======== */ 1109 #define CIFS_MAX_CHANNELS 16 1110 #define CIFS_INVAL_CHAN_INDEX (-1) 1111 #define CIFS_ALL_CHANNELS_SET(ses) \ 1112 ((1UL << (ses)->chan_count) - 1) 1113 #define CIFS_ALL_CHANS_GOOD(ses) \ 1114 (!(ses)->chans_need_reconnect) 1115 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1116 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1117 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1118 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1119 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1120 test_bit((index), &(ses)->chans_need_reconnect) 1121 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1122 ((ses)->chans[(index)].in_reconnect) 1123 1124 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1125 size_t chan_count; 1126 size_t chan_max; 1127 atomic_t chan_seq; /* round robin state */ 1128 1129 /* 1130 * chans_need_reconnect is a bitmap indicating which of the channels 1131 * under this smb session needs to be reconnected. 1132 * If not multichannel session, only one bit will be used. 1133 * 1134 * We will ask for sess and tcon reconnection only if all the 1135 * channels are marked for needing reconnection. This will 1136 * enable the sessions on top to continue to live till any 1137 * of the channels below are active. 1138 */ 1139 unsigned long chans_need_reconnect; 1140 /* ========= end: protected by chan_lock ======== */ 1141 struct cifs_ses *dfs_root_ses; 1142 struct nls_table *local_nls; 1143 }; 1144 1145 static inline bool 1146 cap_unix(struct cifs_ses *ses) 1147 { 1148 return ses->server->vals->cap_unix & ses->capabilities; 1149 } 1150 1151 /* 1152 * common struct for holding inode info when searching for or updating an 1153 * inode with new info 1154 */ 1155 1156 #define CIFS_FATTR_JUNCTION 0x1 1157 #define CIFS_FATTR_DELETE_PENDING 0x2 1158 #define CIFS_FATTR_NEED_REVAL 0x4 1159 #define CIFS_FATTR_INO_COLLISION 0x8 1160 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1161 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1162 1163 struct cifs_fattr { 1164 u32 cf_flags; 1165 u32 cf_cifsattrs; 1166 u64 cf_uniqueid; 1167 u64 cf_eof; 1168 u64 cf_bytes; 1169 u64 cf_createtime; 1170 kuid_t cf_uid; 1171 kgid_t cf_gid; 1172 umode_t cf_mode; 1173 dev_t cf_rdev; 1174 unsigned int cf_nlink; 1175 unsigned int cf_dtype; 1176 struct timespec64 cf_atime; 1177 struct timespec64 cf_mtime; 1178 struct timespec64 cf_ctime; 1179 u32 cf_cifstag; 1180 char *cf_symlink_target; 1181 }; 1182 1183 /* 1184 * there is one of these for each connection to a resource on a particular 1185 * session 1186 */ 1187 struct cifs_tcon { 1188 struct list_head tcon_list; 1189 int tc_count; 1190 struct list_head rlist; /* reconnect list */ 1191 spinlock_t tc_lock; /* protect anything here that is not protected */ 1192 atomic_t num_local_opens; /* num of all opens including disconnected */ 1193 atomic_t num_remote_opens; /* num of all network opens on server */ 1194 struct list_head openFileList; 1195 spinlock_t open_file_lock; /* protects list above */ 1196 struct cifs_ses *ses; /* pointer to session associated with */ 1197 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1198 char *nativeFileSystem; 1199 char *password; /* for share-level security */ 1200 __u32 tid; /* The 4 byte tree id */ 1201 __u16 Flags; /* optional support bits */ 1202 enum tid_status_enum status; 1203 atomic_t num_smbs_sent; 1204 union { 1205 struct { 1206 atomic_t num_writes; 1207 atomic_t num_reads; 1208 atomic_t num_flushes; 1209 atomic_t num_oplock_brks; 1210 atomic_t num_opens; 1211 atomic_t num_closes; 1212 atomic_t num_deletes; 1213 atomic_t num_mkdirs; 1214 atomic_t num_posixopens; 1215 atomic_t num_posixmkdirs; 1216 atomic_t num_rmdirs; 1217 atomic_t num_renames; 1218 atomic_t num_t2renames; 1219 atomic_t num_ffirst; 1220 atomic_t num_fnext; 1221 atomic_t num_fclose; 1222 atomic_t num_hardlinks; 1223 atomic_t num_symlinks; 1224 atomic_t num_locks; 1225 atomic_t num_acl_get; 1226 atomic_t num_acl_set; 1227 } cifs_stats; 1228 struct { 1229 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1230 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1231 } smb2_stats; 1232 } stats; 1233 __u64 bytes_read; 1234 __u64 bytes_written; 1235 spinlock_t stat_lock; /* protects the two fields above */ 1236 time64_t stats_from_time; 1237 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1238 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1239 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1240 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1241 bool pipe:1; /* set if connection to pipe share */ 1242 bool print:1; /* set if connection to printer share */ 1243 bool retry:1; 1244 bool nocase:1; 1245 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1246 bool nodelete:1; 1247 bool seal:1; /* transport encryption for this mounted share */ 1248 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1249 for this mount even if server would support */ 1250 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1251 bool local_lease:1; /* check leases (only) on local system not remote */ 1252 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1253 bool broken_sparse_sup; /* if server or share does not support sparse */ 1254 bool need_reconnect:1; /* connection reset, tid now invalid */ 1255 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1256 bool use_resilient:1; /* use resilient instead of durable handles */ 1257 bool use_persistent:1; /* use persistent instead of durable handles */ 1258 bool no_lease:1; /* Do not request leases on files or directories */ 1259 bool use_witness:1; /* use witness protocol */ 1260 __le32 capabilities; 1261 __u32 share_flags; 1262 __u32 maximal_access; 1263 __u32 vol_serial_number; 1264 __le64 vol_create_time; 1265 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1266 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1267 __u32 ss_flags; /* sector size flags */ 1268 __u32 perf_sector_size; /* best sector size for perf */ 1269 __u32 max_chunks; 1270 __u32 max_bytes_chunk; 1271 __u32 max_bytes_copy; 1272 __u32 max_cached_dirs; 1273 #ifdef CONFIG_CIFS_FSCACHE 1274 u64 resource_id; /* server resource id */ 1275 struct fscache_volume *fscache; /* cookie for share */ 1276 #endif 1277 struct list_head pending_opens; /* list of incomplete opens */ 1278 struct cached_fids *cfids; 1279 /* BB add field for back pointer to sb struct(s)? */ 1280 #ifdef CONFIG_CIFS_DFS_UPCALL 1281 struct list_head dfs_ses_list; 1282 struct delayed_work dfs_cache_work; 1283 #endif 1284 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1285 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1286 }; 1287 1288 /* 1289 * This is a refcounted and timestamped container for a tcon pointer. The 1290 * container holds a tcon reference. It is considered safe to free one of 1291 * these when the tl_count goes to 0. The tl_time is the time of the last 1292 * "get" on the container. 1293 */ 1294 struct tcon_link { 1295 struct rb_node tl_rbnode; 1296 kuid_t tl_uid; 1297 unsigned long tl_flags; 1298 #define TCON_LINK_MASTER 0 1299 #define TCON_LINK_PENDING 1 1300 #define TCON_LINK_IN_TREE 2 1301 unsigned long tl_time; 1302 atomic_t tl_count; 1303 struct cifs_tcon *tl_tcon; 1304 }; 1305 1306 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1307 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1308 1309 static inline struct cifs_tcon * 1310 tlink_tcon(struct tcon_link *tlink) 1311 { 1312 return tlink->tl_tcon; 1313 } 1314 1315 static inline struct tcon_link * 1316 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1317 { 1318 return cifs_sb->master_tlink; 1319 } 1320 1321 extern void cifs_put_tlink(struct tcon_link *tlink); 1322 1323 static inline struct tcon_link * 1324 cifs_get_tlink(struct tcon_link *tlink) 1325 { 1326 if (tlink && !IS_ERR(tlink)) 1327 atomic_inc(&tlink->tl_count); 1328 return tlink; 1329 } 1330 1331 /* This function is always expected to succeed */ 1332 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1333 1334 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1335 1336 struct cifs_pending_open { 1337 struct list_head olist; 1338 struct tcon_link *tlink; 1339 __u8 lease_key[16]; 1340 __u32 oplock; 1341 }; 1342 1343 struct cifs_deferred_close { 1344 struct list_head dlist; 1345 struct tcon_link *tlink; 1346 __u16 netfid; 1347 __u64 persistent_fid; 1348 __u64 volatile_fid; 1349 }; 1350 1351 /* 1352 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1353 * This is used to track byte stream locks on the file 1354 */ 1355 struct cifsLockInfo { 1356 struct list_head llist; /* pointer to next cifsLockInfo */ 1357 struct list_head blist; /* pointer to locks blocked on this */ 1358 wait_queue_head_t block_q; 1359 __u64 offset; 1360 __u64 length; 1361 __u32 pid; 1362 __u16 type; 1363 __u16 flags; 1364 }; 1365 1366 /* 1367 * One of these for each open instance of a file 1368 */ 1369 struct cifs_search_info { 1370 loff_t index_of_last_entry; 1371 __u16 entries_in_buffer; 1372 __u16 info_level; 1373 __u32 resume_key; 1374 char *ntwrk_buf_start; 1375 char *srch_entries_start; 1376 char *last_entry; 1377 const char *presume_name; 1378 unsigned int resume_name_len; 1379 bool endOfSearch:1; 1380 bool emptyDir:1; 1381 bool unicode:1; 1382 bool smallBuf:1; /* so we know which buf_release function to call */ 1383 }; 1384 1385 #define ACL_NO_MODE ((umode_t)(-1)) 1386 struct cifs_open_parms { 1387 struct cifs_tcon *tcon; 1388 struct cifs_sb_info *cifs_sb; 1389 int disposition; 1390 int desired_access; 1391 int create_options; 1392 const char *path; 1393 struct cifs_fid *fid; 1394 umode_t mode; 1395 bool reconnect:1; 1396 bool replay:1; /* indicates that this open is for a replay */ 1397 struct kvec *ea_cctx; 1398 }; 1399 1400 struct cifs_fid { 1401 __u16 netfid; 1402 __u64 persistent_fid; /* persist file id for smb2 */ 1403 __u64 volatile_fid; /* volatile file id for smb2 */ 1404 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1405 __u8 create_guid[16]; 1406 __u32 access; 1407 struct cifs_pending_open *pending_open; 1408 unsigned int epoch; 1409 #ifdef CONFIG_CIFS_DEBUG2 1410 __u64 mid; 1411 #endif /* CIFS_DEBUG2 */ 1412 bool purge_cache; 1413 }; 1414 1415 struct cifs_fid_locks { 1416 struct list_head llist; 1417 struct cifsFileInfo *cfile; /* fid that owns locks */ 1418 struct list_head locks; /* locks held by fid above */ 1419 }; 1420 1421 struct cifsFileInfo { 1422 /* following two lists are protected by tcon->open_file_lock */ 1423 struct list_head tlist; /* pointer to next fid owned by tcon */ 1424 struct list_head flist; /* next fid (file instance) for this inode */ 1425 /* lock list below protected by cifsi->lock_sem */ 1426 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1427 kuid_t uid; /* allows finding which FileInfo structure */ 1428 __u32 pid; /* process id who opened file */ 1429 struct cifs_fid fid; /* file id from remote */ 1430 struct list_head rlist; /* reconnect list */ 1431 /* BB add lock scope info here if needed */ 1432 /* lock scope id (0 if none) */ 1433 struct dentry *dentry; 1434 struct tcon_link *tlink; 1435 unsigned int f_flags; 1436 bool invalidHandle:1; /* file closed via session abend */ 1437 bool swapfile:1; 1438 bool oplock_break_cancelled:1; 1439 bool status_file_deleted:1; /* file has been deleted */ 1440 unsigned int oplock_epoch; /* epoch from the lease break */ 1441 __u32 oplock_level; /* oplock/lease level from the lease break */ 1442 int count; 1443 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1444 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1445 struct cifs_search_info srch_inf; 1446 struct work_struct oplock_break; /* work for oplock breaks */ 1447 struct work_struct put; /* work for the final part of _put */ 1448 struct delayed_work deferred; 1449 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1450 char *symlink_target; 1451 }; 1452 1453 struct cifs_io_parms { 1454 __u16 netfid; 1455 __u64 persistent_fid; /* persist file id for smb2 */ 1456 __u64 volatile_fid; /* volatile file id for smb2 */ 1457 __u32 pid; 1458 __u64 offset; 1459 unsigned int length; 1460 struct cifs_tcon *tcon; 1461 struct TCP_Server_Info *server; 1462 }; 1463 1464 struct cifs_aio_ctx { 1465 struct kref refcount; 1466 struct list_head list; 1467 struct mutex aio_mutex; 1468 struct completion done; 1469 struct iov_iter iter; 1470 struct kiocb *iocb; 1471 struct cifsFileInfo *cfile; 1472 struct bio_vec *bv; 1473 loff_t pos; 1474 unsigned int nr_pinned_pages; 1475 ssize_t rc; 1476 unsigned int len; 1477 unsigned int total_len; 1478 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1479 bool should_dirty; 1480 /* 1481 * Indicates if this aio_ctx is for direct_io, 1482 * If yes, iter is a copy of the user passed iov_iter 1483 */ 1484 bool direct_io; 1485 }; 1486 1487 /* asynchronous read support */ 1488 struct cifs_readdata { 1489 struct kref refcount; 1490 struct list_head list; 1491 struct completion done; 1492 struct cifsFileInfo *cfile; 1493 struct address_space *mapping; 1494 struct cifs_aio_ctx *ctx; 1495 __u64 offset; 1496 ssize_t got_bytes; 1497 unsigned int bytes; 1498 pid_t pid; 1499 int result; 1500 struct work_struct work; 1501 struct iov_iter iter; 1502 struct kvec iov[2]; 1503 struct TCP_Server_Info *server; 1504 #ifdef CONFIG_CIFS_SMB_DIRECT 1505 struct smbd_mr *mr; 1506 #endif 1507 struct cifs_credits credits; 1508 }; 1509 1510 /* asynchronous write support */ 1511 struct cifs_writedata { 1512 struct kref refcount; 1513 struct list_head list; 1514 struct completion done; 1515 enum writeback_sync_modes sync_mode; 1516 struct work_struct work; 1517 struct cifsFileInfo *cfile; 1518 struct cifs_aio_ctx *ctx; 1519 struct iov_iter iter; 1520 struct bio_vec *bv; 1521 __u64 offset; 1522 pid_t pid; 1523 unsigned int bytes; 1524 int result; 1525 struct TCP_Server_Info *server; 1526 #ifdef CONFIG_CIFS_SMB_DIRECT 1527 struct smbd_mr *mr; 1528 #endif 1529 struct cifs_credits credits; 1530 bool replay; 1531 }; 1532 1533 /* 1534 * Take a reference on the file private data. Must be called with 1535 * cfile->file_info_lock held. 1536 */ 1537 static inline void 1538 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1539 { 1540 ++cifs_file->count; 1541 } 1542 1543 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1544 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1545 bool offload); 1546 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1547 1548 #define CIFS_CACHE_READ_FLG 1 1549 #define CIFS_CACHE_HANDLE_FLG 2 1550 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1551 #define CIFS_CACHE_WRITE_FLG 4 1552 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1553 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1554 1555 #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)) 1556 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1557 #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)) 1558 1559 /* 1560 * One of these for each file inode 1561 */ 1562 1563 struct cifsInodeInfo { 1564 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1565 bool can_cache_brlcks; 1566 struct list_head llist; /* locks helb by this inode */ 1567 /* 1568 * NOTE: Some code paths call down_read(lock_sem) twice, so 1569 * we must always use cifs_down_write() instead of down_write() 1570 * for this semaphore to avoid deadlocks. 1571 */ 1572 struct rw_semaphore lock_sem; /* protect the fields above */ 1573 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1574 struct list_head openFileList; 1575 spinlock_t open_file_lock; /* protects openFileList */ 1576 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1577 unsigned int oplock; /* oplock/lease level we have */ 1578 unsigned int epoch; /* used to track lease state changes */ 1579 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1580 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1581 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1582 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1583 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1584 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1585 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1586 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1587 unsigned long flags; 1588 spinlock_t writers_lock; 1589 unsigned int writers; /* Number of writers on this inode */ 1590 unsigned long time; /* jiffies of last update of inode */ 1591 u64 uniqueid; /* server inode number */ 1592 u64 createtime; /* creation time on server */ 1593 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1594 struct list_head deferred_closes; /* list of deferred closes */ 1595 spinlock_t deferred_lock; /* protection on deferred list */ 1596 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1597 char *symlink_target; 1598 __u32 reparse_tag; 1599 }; 1600 1601 static inline struct cifsInodeInfo * 1602 CIFS_I(struct inode *inode) 1603 { 1604 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1605 } 1606 1607 static inline struct cifs_sb_info * 1608 CIFS_SB(struct super_block *sb) 1609 { 1610 return sb->s_fs_info; 1611 } 1612 1613 static inline struct cifs_sb_info * 1614 CIFS_FILE_SB(struct file *file) 1615 { 1616 return CIFS_SB(file_inode(file)->i_sb); 1617 } 1618 1619 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1620 { 1621 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1622 return '/'; 1623 else 1624 return '\\'; 1625 } 1626 1627 static inline void 1628 convert_delimiter(char *path, char delim) 1629 { 1630 char old_delim, *pos; 1631 1632 if (delim == '/') 1633 old_delim = '\\'; 1634 else 1635 old_delim = '/'; 1636 1637 pos = path; 1638 while ((pos = strchr(pos, old_delim))) 1639 *pos = delim; 1640 } 1641 1642 #define cifs_stats_inc atomic_inc 1643 1644 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1645 unsigned int bytes) 1646 { 1647 if (bytes) { 1648 spin_lock(&tcon->stat_lock); 1649 tcon->bytes_written += bytes; 1650 spin_unlock(&tcon->stat_lock); 1651 } 1652 } 1653 1654 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1655 unsigned int bytes) 1656 { 1657 spin_lock(&tcon->stat_lock); 1658 tcon->bytes_read += bytes; 1659 spin_unlock(&tcon->stat_lock); 1660 } 1661 1662 1663 /* 1664 * This is the prototype for the mid receive function. This function is for 1665 * receiving the rest of the SMB frame, starting with the WordCount (which is 1666 * just after the MID in struct smb_hdr). Note: 1667 * 1668 * - This will be called by cifsd, with no locks held. 1669 * - The mid will still be on the pending_mid_q. 1670 * - mid->resp_buf will point to the current buffer. 1671 * 1672 * Returns zero on a successful receive, or an error. The receive state in 1673 * the TCP_Server_Info will also be updated. 1674 */ 1675 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1676 struct mid_q_entry *mid); 1677 1678 /* 1679 * This is the prototype for the mid callback function. This is called once the 1680 * mid has been received off of the socket. When creating one, take special 1681 * care to avoid deadlocks. Things to bear in mind: 1682 * 1683 * - it will be called by cifsd, with no locks held 1684 * - the mid will be removed from any lists 1685 */ 1686 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1687 1688 /* 1689 * This is the protopyte for mid handle function. This is called once the mid 1690 * has been recognized after decryption of the message. 1691 */ 1692 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1693 struct mid_q_entry *mid); 1694 1695 /* one of these for every pending CIFS request to the server */ 1696 struct mid_q_entry { 1697 struct list_head qhead; /* mids waiting on reply from this server */ 1698 struct kref refcount; 1699 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1700 __u64 mid; /* multiplex id */ 1701 __u16 credits; /* number of credits consumed by this mid */ 1702 __u16 credits_received; /* number of credits from the response */ 1703 __u32 pid; /* process id */ 1704 __u32 sequence_number; /* for CIFS signing */ 1705 unsigned long when_alloc; /* when mid was created */ 1706 #ifdef CONFIG_CIFS_STATS2 1707 unsigned long when_sent; /* time when smb send finished */ 1708 unsigned long when_received; /* when demux complete (taken off wire) */ 1709 #endif 1710 mid_receive_t *receive; /* call receive callback */ 1711 mid_callback_t *callback; /* call completion callback */ 1712 mid_handle_t *handle; /* call handle mid callback */ 1713 void *callback_data; /* general purpose pointer for callback */ 1714 struct task_struct *creator; 1715 void *resp_buf; /* pointer to received SMB header */ 1716 unsigned int resp_buf_size; 1717 int mid_state; /* wish this were enum but can not pass to wait_event */ 1718 unsigned int mid_flags; 1719 __le16 command; /* smb command code */ 1720 unsigned int optype; /* operation type */ 1721 bool large_buf:1; /* if valid response, is pointer to large buf */ 1722 bool multiRsp:1; /* multiple trans2 responses for one request */ 1723 bool multiEnd:1; /* both received */ 1724 bool decrypted:1; /* decrypted entry */ 1725 }; 1726 1727 struct close_cancelled_open { 1728 struct cifs_fid fid; 1729 struct cifs_tcon *tcon; 1730 struct work_struct work; 1731 __u64 mid; 1732 __u16 cmd; 1733 }; 1734 1735 /* Make code in transport.c a little cleaner by moving 1736 update of optional stats into function below */ 1737 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1738 { 1739 atomic_inc(&server->in_send); 1740 } 1741 1742 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1743 { 1744 atomic_dec(&server->in_send); 1745 } 1746 1747 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1748 { 1749 atomic_inc(&server->num_waiters); 1750 } 1751 1752 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1753 { 1754 atomic_dec(&server->num_waiters); 1755 } 1756 1757 #ifdef CONFIG_CIFS_STATS2 1758 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1759 { 1760 mid->when_sent = jiffies; 1761 } 1762 #else 1763 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1764 { 1765 } 1766 #endif 1767 1768 /* for pending dnotify requests */ 1769 struct dir_notify_req { 1770 struct list_head lhead; 1771 __le16 Pid; 1772 __le16 PidHigh; 1773 __u16 Mid; 1774 __u16 Tid; 1775 __u16 Uid; 1776 __u16 netfid; 1777 __u32 filter; /* CompletionFilter (for multishot) */ 1778 int multishot; 1779 struct file *pfile; 1780 }; 1781 1782 struct dfs_info3_param { 1783 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1784 int path_consumed; 1785 int server_type; 1786 int ref_flag; 1787 char *path_name; 1788 char *node_name; 1789 int ttl; 1790 }; 1791 1792 struct file_list { 1793 struct list_head list; 1794 struct cifsFileInfo *cfile; 1795 }; 1796 1797 struct cifs_mount_ctx { 1798 struct cifs_sb_info *cifs_sb; 1799 struct smb3_fs_context *fs_ctx; 1800 unsigned int xid; 1801 struct TCP_Server_Info *server; 1802 struct cifs_ses *ses; 1803 struct cifs_tcon *tcon; 1804 struct list_head dfs_ses_list; 1805 }; 1806 1807 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1808 { 1809 kfree(param->path_name); 1810 kfree(param->node_name); 1811 } 1812 1813 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1814 { 1815 if (param) 1816 __free_dfs_info_param(param); 1817 } 1818 1819 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1820 { 1821 if (param) { 1822 __free_dfs_info_param(param); 1823 memset(param, 0, sizeof(*param)); 1824 } 1825 } 1826 1827 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1828 int number_of_items) 1829 { 1830 int i; 1831 1832 if ((number_of_items == 0) || (param == NULL)) 1833 return; 1834 for (i = 0; i < number_of_items; i++) { 1835 kfree(param[i].path_name); 1836 kfree(param[i].node_name); 1837 } 1838 kfree(param); 1839 } 1840 1841 static inline bool is_interrupt_error(int error) 1842 { 1843 switch (error) { 1844 case -EINTR: 1845 case -ERESTARTSYS: 1846 case -ERESTARTNOHAND: 1847 case -ERESTARTNOINTR: 1848 return true; 1849 } 1850 return false; 1851 } 1852 1853 static inline bool is_retryable_error(int error) 1854 { 1855 if (is_interrupt_error(error) || error == -EAGAIN) 1856 return true; 1857 return false; 1858 } 1859 1860 static inline bool is_replayable_error(int error) 1861 { 1862 if (error == -EAGAIN || error == -ECONNABORTED) 1863 return true; 1864 return false; 1865 } 1866 1867 1868 /* cifs_get_writable_file() flags */ 1869 #define FIND_WR_ANY 0 1870 #define FIND_WR_FSUID_ONLY 1 1871 #define FIND_WR_WITH_DELETE 2 1872 1873 #define MID_FREE 0 1874 #define MID_REQUEST_ALLOCATED 1 1875 #define MID_REQUEST_SUBMITTED 2 1876 #define MID_RESPONSE_RECEIVED 4 1877 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1878 #define MID_RESPONSE_MALFORMED 0x10 1879 #define MID_SHUTDOWN 0x20 1880 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1881 1882 /* Flags */ 1883 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1884 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1885 1886 /* Types of response buffer returned from SendReceive2 */ 1887 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1888 #define CIFS_SMALL_BUFFER 1 1889 #define CIFS_LARGE_BUFFER 2 1890 #define CIFS_IOVEC 4 /* array of response buffers */ 1891 1892 /* Type of Request to SendReceive2 */ 1893 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1894 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1895 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1896 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1897 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1898 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1899 1900 /* Type of request operation */ 1901 #define CIFS_ECHO_OP 0x080 /* echo request */ 1902 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1903 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1904 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1905 /* Lower bitmask values are reserved by others below. */ 1906 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1907 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1908 1909 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1910 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1911 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1912 1913 /* Security Flags: indicate type of session setup needed */ 1914 #define CIFSSEC_MAY_SIGN 0x00001 1915 #define CIFSSEC_MAY_NTLMV2 0x00004 1916 #define CIFSSEC_MAY_KRB5 0x00008 1917 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1918 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1919 1920 #define CIFSSEC_MUST_SIGN 0x01001 1921 /* note that only one of the following can be set so the 1922 result of setting MUST flags more than once will be to 1923 require use of the stronger protocol */ 1924 #define CIFSSEC_MUST_NTLMV2 0x04004 1925 #define CIFSSEC_MUST_KRB5 0x08008 1926 #ifdef CONFIG_CIFS_UPCALL 1927 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1928 #else 1929 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1930 #endif /* UPCALL */ 1931 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1932 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1933 1934 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1935 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1936 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1937 /* 1938 ***************************************************************** 1939 * All constants go here 1940 ***************************************************************** 1941 */ 1942 1943 #define UID_HASH (16) 1944 1945 /* 1946 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1947 * following to be declared. 1948 */ 1949 1950 /**************************************************************************** 1951 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1952 * to the locking order. i.e. if two locks are to be held together, the lock that 1953 * appears higher in this list needs to be taken before the other. 1954 * 1955 * If you hold a lock that is lower in this list, and you need to take a higher lock 1956 * (or if you think that one of the functions that you're calling may need to), first 1957 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1958 * ensure that locks are picked up only in one direction in the below table 1959 * (top to bottom). 1960 * 1961 * Also, if you expect a function to be called with a lock held, explicitly document 1962 * this in the comments on top of your function definition. 1963 * 1964 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1965 * possible. Blocking / calling other functions with a lock held always increase 1966 * the risk of a possible deadlock. 1967 * 1968 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1969 * debug. Also, any new lock that you introduce, please add to this list in the correct 1970 * order. 1971 * 1972 * Please populate this list whenever you introduce new locks in your changes. Or in 1973 * case I've missed some existing locks. Please ensure that it's added in the list 1974 * based on the locking order expected. 1975 * 1976 * ===================================================================================== 1977 * Lock Protects Initialization fn 1978 * ===================================================================================== 1979 * vol_list_lock 1980 * vol_info->ctx_lock vol_info->ctx 1981 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1982 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1983 * reconnect_mutex 1984 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1985 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1986 * cifs_tcon 1987 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1988 * cifs_tcon->pending_opens 1989 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1990 * cifs_tcon->bytes_written 1991 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1992 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1993 * GlobalCurrentXid 1994 * GlobalTotalActiveXid 1995 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1996 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1997 * ->CurrentMid 1998 * (any changes in mid_q_entry fields) 1999 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 2000 * ->credits 2001 * ->echo_credits 2002 * ->oplock_credits 2003 * ->reconnect_instance 2004 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 2005 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 2006 * ->iface_count 2007 * ->iface_last_update 2008 * cifs_ses->chan_lock cifs_ses->chans 2009 * ->chans_need_reconnect 2010 * ->chans_in_reconnect 2011 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 2012 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 2013 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 2014 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 2015 * ->can_cache_brlcks 2016 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 2017 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 2018 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 2019 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 2020 * ->invalidHandle initiate_cifs_search 2021 * ->oplock_break_cancelled 2022 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 2023 ****************************************************************************/ 2024 2025 #ifdef DECLARE_GLOBALS_HERE 2026 #define GLOBAL_EXTERN 2027 #else 2028 #define GLOBAL_EXTERN extern 2029 #endif 2030 2031 /* 2032 * the list of TCP_Server_Info structures, ie each of the sockets 2033 * connecting our client to a distinct server (ip address), is 2034 * chained together by cifs_tcp_ses_list. The list of all our SMB 2035 * sessions (and from that the tree connections) can be found 2036 * by iterating over cifs_tcp_ses_list 2037 */ 2038 extern struct list_head cifs_tcp_ses_list; 2039 2040 /* 2041 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2042 * tcp session, and the list of tcon's per smb session. It also protects 2043 * the reference counters for the server, smb session, and tcon. 2044 * generally the locks should be taken in order tcp_ses_lock before 2045 * tcon->open_file_lock and that before file->file_info_lock since the 2046 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2047 */ 2048 extern spinlock_t cifs_tcp_ses_lock; 2049 2050 /* 2051 * Global transaction id (XID) information 2052 */ 2053 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2054 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2055 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2056 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2057 2058 /* 2059 * Global counters, updated atomically 2060 */ 2061 extern atomic_t sesInfoAllocCount; 2062 extern atomic_t tconInfoAllocCount; 2063 extern atomic_t tcpSesNextId; 2064 extern atomic_t tcpSesAllocCount; 2065 extern atomic_t tcpSesReconnectCount; 2066 extern atomic_t tconInfoReconnectCount; 2067 2068 /* Various Debug counters */ 2069 extern atomic_t buf_alloc_count; /* current number allocated */ 2070 extern atomic_t small_buf_alloc_count; 2071 #ifdef CONFIG_CIFS_STATS2 2072 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2073 extern atomic_t total_small_buf_alloc_count; 2074 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2075 #endif 2076 2077 /* Misc globals */ 2078 extern bool enable_oplocks; /* enable or disable oplocks */ 2079 extern bool lookupCacheEnabled; 2080 extern unsigned int global_secflags; /* if on, session setup sent 2081 with more secure ntlmssp2 challenge/resp */ 2082 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2083 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2084 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2085 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2086 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2087 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2088 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2089 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2090 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2091 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2092 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2093 extern atomic_t mid_count; 2094 2095 void cifs_oplock_break(struct work_struct *work); 2096 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2097 void smb2_deferred_work_close(struct work_struct *work); 2098 2099 extern const struct slow_work_ops cifs_oplock_break_ops; 2100 extern struct workqueue_struct *cifsiod_wq; 2101 extern struct workqueue_struct *decrypt_wq; 2102 extern struct workqueue_struct *fileinfo_put_wq; 2103 extern struct workqueue_struct *cifsoplockd_wq; 2104 extern struct workqueue_struct *deferredclose_wq; 2105 extern __u32 cifs_lock_secret; 2106 2107 extern mempool_t *cifs_mid_poolp; 2108 2109 /* Operations for different SMB versions */ 2110 #define SMB1_VERSION_STRING "1.0" 2111 #define SMB20_VERSION_STRING "2.0" 2112 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2113 extern struct smb_version_operations smb1_operations; 2114 extern struct smb_version_values smb1_values; 2115 extern struct smb_version_operations smb20_operations; 2116 extern struct smb_version_values smb20_values; 2117 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2118 #define SMB21_VERSION_STRING "2.1" 2119 extern struct smb_version_operations smb21_operations; 2120 extern struct smb_version_values smb21_values; 2121 #define SMBDEFAULT_VERSION_STRING "default" 2122 extern struct smb_version_values smbdefault_values; 2123 #define SMB3ANY_VERSION_STRING "3" 2124 extern struct smb_version_values smb3any_values; 2125 #define SMB30_VERSION_STRING "3.0" 2126 extern struct smb_version_operations smb30_operations; 2127 extern struct smb_version_values smb30_values; 2128 #define SMB302_VERSION_STRING "3.02" 2129 #define ALT_SMB302_VERSION_STRING "3.0.2" 2130 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2131 extern struct smb_version_values smb302_values; 2132 #define SMB311_VERSION_STRING "3.1.1" 2133 #define ALT_SMB311_VERSION_STRING "3.11" 2134 extern struct smb_version_operations smb311_operations; 2135 extern struct smb_version_values smb311_values; 2136 2137 static inline char *get_security_type_str(enum securityEnum sectype) 2138 { 2139 switch (sectype) { 2140 case RawNTLMSSP: 2141 return "RawNTLMSSP"; 2142 case Kerberos: 2143 return "Kerberos"; 2144 case NTLMv2: 2145 return "NTLMv2"; 2146 default: 2147 return "Unknown"; 2148 } 2149 } 2150 2151 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2152 { 2153 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2154 } 2155 2156 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2157 { 2158 /* 2159 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2160 * Subsystem Notifies That a Share Is a DFS Share. 2161 * 2162 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2163 * Application Updates a Share. 2164 */ 2165 if (!tcon || !tcon->ses || !tcon->ses->server) 2166 return false; 2167 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2168 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2169 } 2170 2171 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2172 const struct dfs_info3_param *ref) 2173 { 2174 /* 2175 * Check if all targets are capable of handling DFS referrals as per 2176 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2177 */ 2178 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2179 } 2180 2181 static inline u64 cifs_flock_len(const struct file_lock *fl) 2182 { 2183 return (u64)fl->fl_end - fl->fl_start + 1; 2184 } 2185 2186 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2187 { 2188 if (WARN_ON_ONCE(!ses || !ses->server)) 2189 return 0; 2190 /* 2191 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2192 * servers do require it during NTLMSSP. 2193 */ 2194 if (ses->server->dialect <= SMB20_PROT_ID) 2195 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2196 return sizeof(ses->workstation_name); 2197 } 2198 2199 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2200 { 2201 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2202 dst->AccessFlags = src->AccessFlags; 2203 dst->CurrentByteOffset = src->CurrentByteOffset; 2204 dst->Mode = src->Mode; 2205 dst->AlignmentRequirement = src->AlignmentRequirement; 2206 dst->FileNameLength = src->FileNameLength; 2207 } 2208 2209 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2210 int num_rqst, 2211 const u8 *sig) 2212 { 2213 unsigned int len, skip; 2214 unsigned int nents = 0; 2215 unsigned long addr; 2216 size_t data_size; 2217 int i, j; 2218 2219 /* 2220 * The first rqst has a transform header where the first 20 bytes are 2221 * not part of the encrypted blob. 2222 */ 2223 skip = 20; 2224 2225 /* Assumes the first rqst has a transform header as the first iov. 2226 * I.e. 2227 * rqst[0].rq_iov[0] is transform header 2228 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2229 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2230 */ 2231 for (i = 0; i < num_rqst; i++) { 2232 data_size = iov_iter_count(&rqst[i].rq_iter); 2233 2234 /* We really don't want a mixture of pinned and unpinned pages 2235 * in the sglist. It's hard to keep track of which is what. 2236 * Instead, we convert to a BVEC-type iterator higher up. 2237 */ 2238 if (data_size && 2239 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2240 return -EIO; 2241 2242 /* We also don't want to have any extra refs or pins to clean 2243 * up in the sglist. 2244 */ 2245 if (data_size && 2246 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2247 return -EIO; 2248 2249 for (j = 0; j < rqst[i].rq_nvec; j++) { 2250 struct kvec *iov = &rqst[i].rq_iov[j]; 2251 2252 addr = (unsigned long)iov->iov_base + skip; 2253 if (unlikely(is_vmalloc_addr((void *)addr))) { 2254 len = iov->iov_len - skip; 2255 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2256 PAGE_SIZE); 2257 } else { 2258 nents++; 2259 } 2260 skip = 0; 2261 } 2262 if (data_size) 2263 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2264 } 2265 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2266 return nents; 2267 } 2268 2269 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2270 * stack object as buf. 2271 */ 2272 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2273 const void *buf, 2274 unsigned int buflen) 2275 { 2276 unsigned long addr = (unsigned long)buf; 2277 unsigned int off = offset_in_page(addr); 2278 2279 addr &= PAGE_MASK; 2280 if (unlikely(is_vmalloc_addr((void *)addr))) { 2281 do { 2282 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2283 2284 sg_set_page(&sgtable->sgl[sgtable->nents++], 2285 vmalloc_to_page((void *)addr), len, off); 2286 2287 off = 0; 2288 addr += PAGE_SIZE; 2289 buflen -= len; 2290 } while (buflen); 2291 } else { 2292 sg_set_page(&sgtable->sgl[sgtable->nents++], 2293 virt_to_page((void *)addr), buflen, off); 2294 } 2295 } 2296 2297 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2298 ((struct cifs_open_parms) { \ 2299 .tcon = _tcon, \ 2300 .path = _path, \ 2301 .desired_access = (_da), \ 2302 .disposition = (_cd), \ 2303 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2304 .mode = (_mode), \ 2305 .cifs_sb = _cifs_sb, \ 2306 }) 2307 2308 struct smb2_compound_vars { 2309 struct cifs_open_parms oparms; 2310 struct kvec rsp_iov[MAX_COMPOUND]; 2311 struct smb_rqst rqst[MAX_COMPOUND]; 2312 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2313 struct kvec qi_iov; 2314 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2315 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2316 struct kvec close_iov; 2317 struct smb2_file_rename_info rename_info; 2318 struct smb2_file_link_info link_info; 2319 struct kvec ea_iov; 2320 }; 2321 2322 #endif /* _CIFS_GLOB_H */ 2323