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 /* query for server interfaces */ 359 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 360 bool); 361 /* check if a path is accessible or not */ 362 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 363 struct cifs_sb_info *, const char *); 364 /* query path data from the server */ 365 int (*query_path_info)(const unsigned int xid, 366 struct cifs_tcon *tcon, 367 struct cifs_sb_info *cifs_sb, 368 const char *full_path, 369 struct cifs_open_info_data *data); 370 /* query file data from the server */ 371 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 372 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 373 /* query reparse point to determine which type of special file */ 374 int (*query_reparse_point)(const unsigned int xid, 375 struct cifs_tcon *tcon, 376 struct cifs_sb_info *cifs_sb, 377 const char *full_path, 378 u32 *tag, struct kvec *rsp, 379 int *rsp_buftype); 380 /* get server index number */ 381 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 382 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 383 struct cifs_open_info_data *data); 384 /* set size by path */ 385 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 386 const char *, __u64, struct cifs_sb_info *, bool, 387 struct dentry *); 388 /* set size by file handle */ 389 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 390 struct cifsFileInfo *, __u64, bool); 391 /* set attributes */ 392 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 393 const unsigned int); 394 int (*set_compression)(const unsigned int, struct cifs_tcon *, 395 struct cifsFileInfo *); 396 /* check if we can send an echo or nor */ 397 bool (*can_echo)(struct TCP_Server_Info *); 398 /* send echo request */ 399 int (*echo)(struct TCP_Server_Info *); 400 /* create directory */ 401 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 402 umode_t mode, struct cifs_tcon *tcon, 403 const char *full_path, 404 struct cifs_sb_info *cifs_sb); 405 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 406 struct cifs_tcon *tcon, const char *name, 407 struct cifs_sb_info *sb); 408 /* set info on created directory */ 409 void (*mkdir_setinfo)(struct inode *, const char *, 410 struct cifs_sb_info *, struct cifs_tcon *, 411 const unsigned int); 412 /* remove directory */ 413 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 414 struct cifs_sb_info *); 415 /* unlink file */ 416 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 417 struct cifs_sb_info *, struct dentry *); 418 /* open, rename and delete file */ 419 int (*rename_pending_delete)(const char *, struct dentry *, 420 const unsigned int); 421 /* send rename request */ 422 int (*rename)(const unsigned int xid, 423 struct cifs_tcon *tcon, 424 struct dentry *source_dentry, 425 const char *from_name, const char *to_name, 426 struct cifs_sb_info *cifs_sb); 427 /* send create hardlink request */ 428 int (*create_hardlink)(const unsigned int xid, 429 struct cifs_tcon *tcon, 430 struct dentry *source_dentry, 431 const char *from_name, const char *to_name, 432 struct cifs_sb_info *cifs_sb); 433 /* query symlink target */ 434 int (*query_symlink)(const unsigned int xid, 435 struct cifs_tcon *tcon, 436 struct cifs_sb_info *cifs_sb, 437 const char *full_path, 438 char **target_path); 439 /* open a file for non-posix mounts */ 440 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 441 void *buf); 442 /* set fid protocol-specific info */ 443 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 444 /* close a file */ 445 void (*close)(const unsigned int, struct cifs_tcon *, 446 struct cifs_fid *); 447 /* close a file, returning file attributes and timestamps */ 448 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 449 struct cifsFileInfo *pfile_info); 450 /* send a flush request to the server */ 451 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 452 /* async read from the server */ 453 int (*async_readv)(struct cifs_readdata *); 454 /* async write to the server */ 455 int (*async_writev)(struct cifs_writedata *, 456 void (*release)(struct kref *)); 457 /* sync read from the server */ 458 int (*sync_read)(const unsigned int, struct cifs_fid *, 459 struct cifs_io_parms *, unsigned int *, char **, 460 int *); 461 /* sync write to the server */ 462 int (*sync_write)(const unsigned int, struct cifs_fid *, 463 struct cifs_io_parms *, unsigned int *, struct kvec *, 464 unsigned long); 465 /* open dir, start readdir */ 466 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 467 const char *, struct cifs_sb_info *, 468 struct cifs_fid *, __u16, 469 struct cifs_search_info *); 470 /* continue readdir */ 471 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 472 struct cifs_fid *, 473 __u16, struct cifs_search_info *srch_inf); 474 /* close dir */ 475 int (*close_dir)(const unsigned int, struct cifs_tcon *, 476 struct cifs_fid *); 477 /* calculate a size of SMB message */ 478 unsigned int (*calc_smb_size)(void *buf); 479 /* check for STATUS_PENDING and process the response if yes */ 480 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 481 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 482 bool (*is_session_expired)(char *); 483 /* send oplock break response */ 484 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 485 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 486 /* query remote filesystem */ 487 int (*queryfs)(const unsigned int, struct cifs_tcon *, 488 struct cifs_sb_info *, struct kstatfs *); 489 /* send mandatory brlock to the server */ 490 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 491 __u64, __u32, int, int, bool); 492 /* unlock range of mandatory locks */ 493 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 494 const unsigned int); 495 /* push brlocks from the cache to the server */ 496 int (*push_mand_locks)(struct cifsFileInfo *); 497 /* get lease key of the inode */ 498 void (*get_lease_key)(struct inode *, struct cifs_fid *); 499 /* set lease key of the inode */ 500 void (*set_lease_key)(struct inode *, struct cifs_fid *); 501 /* generate new lease key */ 502 void (*new_lease_key)(struct cifs_fid *); 503 int (*generate_signingkey)(struct cifs_ses *ses, 504 struct TCP_Server_Info *server); 505 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 506 bool allocate_crypto); 507 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 508 struct cifsFileInfo *src_file); 509 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 510 struct cifsFileInfo *src_file, void __user *); 511 int (*notify)(const unsigned int xid, struct file *pfile, 512 void __user *pbuf, bool return_changes); 513 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 514 struct cifs_sb_info *, const unsigned char *, 515 char *, unsigned int *); 516 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 517 struct cifs_sb_info *, const unsigned char *, 518 char *, unsigned int *); 519 /* if we can do cache read operations */ 520 bool (*is_read_op)(__u32); 521 /* set oplock level for the inode */ 522 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 523 bool *); 524 /* create lease context buffer for CREATE request */ 525 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 526 /* parse lease context buffer and return oplock/epoch info */ 527 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 528 ssize_t (*copychunk_range)(const unsigned int, 529 struct cifsFileInfo *src_file, 530 struct cifsFileInfo *target_file, 531 u64 src_off, u64 len, u64 dest_off); 532 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 533 struct cifsFileInfo *target_file, u64 src_off, u64 len, 534 u64 dest_off); 535 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 536 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 537 const unsigned char *, const unsigned char *, char *, 538 size_t, struct cifs_sb_info *); 539 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 540 const char *, const void *, const __u16, 541 const struct nls_table *, struct cifs_sb_info *); 542 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 543 const char *, u32 *, u32); 544 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 545 const struct cifs_fid *, u32 *, u32); 546 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 547 int); 548 /* writepages retry size */ 549 unsigned int (*wp_retry_size)(struct inode *); 550 /* get mtu credits */ 551 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 552 unsigned int *, struct cifs_credits *); 553 /* adjust previously taken mtu credits to request size */ 554 int (*adjust_credits)(struct TCP_Server_Info *server, 555 struct cifs_credits *credits, 556 const unsigned int payload_size); 557 /* check if we need to issue closedir */ 558 bool (*dir_needs_close)(struct cifsFileInfo *); 559 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 560 loff_t); 561 /* init transform request - used for encryption for now */ 562 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 563 struct smb_rqst *, struct smb_rqst *); 564 int (*is_transform_hdr)(void *buf); 565 int (*receive_transform)(struct TCP_Server_Info *, 566 struct mid_q_entry **, char **, int *); 567 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 568 enum securityEnum); 569 int (*next_header)(struct TCP_Server_Info *server, char *buf, 570 unsigned int *noff); 571 /* ioctl passthrough for query_info */ 572 int (*ioctl_query_info)(const unsigned int xid, 573 struct cifs_tcon *tcon, 574 struct cifs_sb_info *cifs_sb, 575 __le16 *path, int is_dir, 576 unsigned long p); 577 /* make unix special files (block, char, fifo, socket) */ 578 int (*make_node)(unsigned int xid, 579 struct inode *inode, 580 struct dentry *dentry, 581 struct cifs_tcon *tcon, 582 const char *full_path, 583 umode_t mode, 584 dev_t device_number); 585 /* version specific fiemap implementation */ 586 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 587 struct fiemap_extent_info *, u64, u64); 588 /* version specific llseek implementation */ 589 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 590 /* Check for STATUS_IO_TIMEOUT */ 591 bool (*is_status_io_timeout)(char *buf); 592 /* Check for STATUS_NETWORK_NAME_DELETED */ 593 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 594 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 595 struct kvec *rsp_iov, 596 struct cifs_open_info_data *data); 597 int (*create_reparse_symlink)(const unsigned int xid, 598 struct inode *inode, 599 struct dentry *dentry, 600 struct cifs_tcon *tcon, 601 const char *full_path, 602 const char *symname); 603 }; 604 605 struct smb_version_values { 606 char *version_string; 607 __u16 protocol_id; 608 __u32 req_capabilities; 609 __u32 large_lock_type; 610 __u32 exclusive_lock_type; 611 __u32 shared_lock_type; 612 __u32 unlock_lock_type; 613 size_t header_preamble_size; 614 size_t header_size; 615 size_t max_header_size; 616 size_t read_rsp_size; 617 __le16 lock_cmd; 618 unsigned int cap_unix; 619 unsigned int cap_nt_find; 620 unsigned int cap_large_files; 621 __u16 signing_enabled; 622 __u16 signing_required; 623 size_t create_lease_size; 624 }; 625 626 #define HEADER_SIZE(server) (server->vals->header_size) 627 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 628 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 629 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 630 631 /** 632 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 633 * trying to reuse existing superblock for a new mount 634 */ 635 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 636 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 637 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 638 CIFS_MOUNT_MAP_SFM_CHR | \ 639 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 640 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 641 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 642 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 643 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 644 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 645 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 646 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 647 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 648 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 649 650 /** 651 * Generic VFS superblock mount flags (s_flags) to consider when 652 * trying to reuse existing superblock for a new mount 653 */ 654 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 655 SB_NODEV | SB_SYNCHRONOUS) 656 657 struct cifs_mnt_data { 658 struct cifs_sb_info *cifs_sb; 659 struct smb3_fs_context *ctx; 660 int flags; 661 }; 662 663 static inline unsigned int 664 get_rfc1002_length(void *buf) 665 { 666 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 667 } 668 669 static inline void 670 inc_rfc1001_len(void *buf, int count) 671 { 672 be32_add_cpu((__be32 *)buf, count); 673 } 674 675 struct TCP_Server_Info { 676 struct list_head tcp_ses_list; 677 struct list_head smb_ses_list; 678 spinlock_t srv_lock; /* protect anything here that is not protected */ 679 __u64 conn_id; /* connection identifier (useful for debugging) */ 680 int srv_count; /* reference counter */ 681 /* 15 character server name + 0x20 16th byte indicating type = srv */ 682 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 683 struct smb_version_operations *ops; 684 struct smb_version_values *vals; 685 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 686 enum statusEnum tcpStatus; /* what we think the status is */ 687 char *hostname; /* hostname portion of UNC string */ 688 struct socket *ssocket; 689 struct sockaddr_storage dstaddr; 690 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 691 #ifdef CONFIG_NET_NS 692 struct net *net; 693 #endif 694 wait_queue_head_t response_q; 695 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 696 spinlock_t mid_lock; /* protect mid queue and it's entries */ 697 struct list_head pending_mid_q; 698 bool noblocksnd; /* use blocking sendmsg */ 699 bool noautotune; /* do not autotune send buf sizes */ 700 bool nosharesock; 701 bool tcp_nodelay; 702 bool terminate; 703 unsigned int credits; /* send no more requests at once */ 704 unsigned int max_credits; /* can override large 32000 default at mnt */ 705 unsigned int in_flight; /* number of requests on the wire to server */ 706 unsigned int max_in_flight; /* max number of requests that were on wire */ 707 spinlock_t req_lock; /* protect the two values above */ 708 struct mutex _srv_mutex; 709 unsigned int nofs_flag; 710 struct task_struct *tsk; 711 char server_GUID[16]; 712 __u16 sec_mode; 713 bool sign; /* is signing enabled on this connection? */ 714 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 715 bool session_estab; /* mark when very first sess is established */ 716 int echo_credits; /* echo reserved slots */ 717 int oplock_credits; /* oplock break reserved slots */ 718 bool echoes:1; /* enable echoes */ 719 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 720 u16 dialect; /* dialect index that server chose */ 721 bool oplocks:1; /* enable oplocks */ 722 unsigned int maxReq; /* Clients should submit no more */ 723 /* than maxReq distinct unanswered SMBs to the server when using */ 724 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 725 unsigned int maxBuf; /* maxBuf specifies the maximum */ 726 /* message size the server can send or receive for non-raw SMBs */ 727 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 728 /* when socket is setup (and during reconnect) before NegProt sent */ 729 unsigned int max_rw; /* maxRw specifies the maximum */ 730 /* message size the server can send or receive for */ 731 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 732 unsigned int capabilities; /* selective disabling of caps by smb sess */ 733 int timeAdj; /* Adjust for difference in server time zone in sec */ 734 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 735 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 736 /* 16th byte of RFC1001 workstation name is always null */ 737 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 738 __u32 sequence_number; /* for signing, protected by srv_mutex */ 739 __u32 reconnect_instance; /* incremented on each reconnect */ 740 struct session_key session_key; 741 unsigned long lstrp; /* when we got last response from this server */ 742 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 743 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 744 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 745 char negflavor; /* NEGOTIATE response flavor */ 746 /* extended security flavors that server supports */ 747 bool sec_ntlmssp; /* supports NTLMSSP */ 748 bool sec_kerberosu2u; /* supports U2U Kerberos */ 749 bool sec_kerberos; /* supports plain Kerberos */ 750 bool sec_mskerberos; /* supports legacy MS Kerberos */ 751 bool large_buf; /* is current buffer large? */ 752 /* use SMBD connection instead of socket */ 753 bool rdma; 754 /* point to the SMBD connection if RDMA is used instead of socket */ 755 struct smbd_connection *smbd_conn; 756 struct delayed_work echo; /* echo ping workqueue job */ 757 char *smallbuf; /* pointer to current "small" buffer */ 758 char *bigbuf; /* pointer to current "big" buffer */ 759 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 760 unsigned int pdu_size; 761 unsigned int total_read; /* total amount of data read in this pass */ 762 atomic_t in_send; /* requests trying to send */ 763 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 764 #ifdef CONFIG_CIFS_STATS2 765 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 766 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 767 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 768 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 769 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 770 #endif /* STATS2 */ 771 unsigned int max_read; 772 unsigned int max_write; 773 unsigned int min_offload; 774 unsigned int retrans; 775 struct { 776 bool requested; /* "compress" mount option set*/ 777 bool enabled; /* actually negotiated with server */ 778 __le16 alg; /* preferred alg negotiated with server */ 779 } compression; 780 __u16 signing_algorithm; 781 __le16 cipher_type; 782 /* save initital negprot hash */ 783 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 784 bool signing_negotiated; /* true if valid signing context rcvd from server */ 785 bool posix_ext_supported; 786 struct delayed_work reconnect; /* reconnect workqueue job */ 787 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 788 unsigned long echo_interval; 789 790 /* 791 * Number of targets available for reconnect. The more targets 792 * the more tasks have to wait to let the demultiplex thread 793 * reconnect. 794 */ 795 int nr_targets; 796 bool noblockcnt; /* use non-blocking connect() */ 797 798 /* 799 * If this is a session channel, 800 * primary_server holds the ref-counted 801 * pointer to primary channel connection for the session. 802 */ 803 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 804 struct TCP_Server_Info *primary_server; 805 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 806 807 #ifdef CONFIG_CIFS_SWN_UPCALL 808 bool use_swn_dstaddr; 809 struct sockaddr_storage swn_dstaddr; 810 #endif 811 struct mutex refpath_lock; /* protects leaf_fullpath */ 812 /* 813 * leaf_fullpath: Canonical DFS referral path related to this 814 * connection. 815 * It is used in DFS cache refresher, reconnect and may 816 * change due to nested DFS links. 817 * 818 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 819 * mostly used for not requiring a copy of @leaf_fullpath when getting 820 * cached or new DFS referrals (which might also sleep during I/O). 821 * While @srv_lock is held for making string and NULL comparions against 822 * both fields as in mount(2) and cache refresh. 823 * 824 * format: \\HOST\SHARE[\OPTIONAL PATH] 825 */ 826 char *leaf_fullpath; 827 }; 828 829 static inline bool is_smb1(struct TCP_Server_Info *server) 830 { 831 return HEADER_PREAMBLE_SIZE(server) != 0; 832 } 833 834 static inline void cifs_server_lock(struct TCP_Server_Info *server) 835 { 836 unsigned int nofs_flag = memalloc_nofs_save(); 837 838 mutex_lock(&server->_srv_mutex); 839 server->nofs_flag = nofs_flag; 840 } 841 842 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 843 { 844 unsigned int nofs_flag = server->nofs_flag; 845 846 mutex_unlock(&server->_srv_mutex); 847 memalloc_nofs_restore(nofs_flag); 848 } 849 850 struct cifs_credits { 851 unsigned int value; 852 unsigned int instance; 853 }; 854 855 static inline unsigned int 856 in_flight(struct TCP_Server_Info *server) 857 { 858 unsigned int num; 859 860 spin_lock(&server->req_lock); 861 num = server->in_flight; 862 spin_unlock(&server->req_lock); 863 return num; 864 } 865 866 static inline bool 867 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 868 { 869 int num; 870 871 spin_lock(&server->req_lock); 872 num = *credits; 873 spin_unlock(&server->req_lock); 874 return num >= num_credits; 875 } 876 877 static inline void 878 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 879 const int optype) 880 { 881 server->ops->add_credits(server, credits, optype); 882 } 883 884 static inline void 885 add_credits_and_wake_if(struct TCP_Server_Info *server, 886 const struct cifs_credits *credits, const int optype) 887 { 888 if (credits->value) { 889 server->ops->add_credits(server, credits, optype); 890 wake_up(&server->request_q); 891 } 892 } 893 894 static inline void 895 set_credits(struct TCP_Server_Info *server, const int val) 896 { 897 server->ops->set_credits(server, val); 898 } 899 900 static inline int 901 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 902 const unsigned int payload_size) 903 { 904 return server->ops->adjust_credits ? 905 server->ops->adjust_credits(server, credits, payload_size) : 0; 906 } 907 908 static inline __le64 909 get_next_mid64(struct TCP_Server_Info *server) 910 { 911 return cpu_to_le64(server->ops->get_next_mid(server)); 912 } 913 914 static inline __le16 915 get_next_mid(struct TCP_Server_Info *server) 916 { 917 __u16 mid = server->ops->get_next_mid(server); 918 /* 919 * The value in the SMB header should be little endian for easy 920 * on-the-wire decoding. 921 */ 922 return cpu_to_le16(mid); 923 } 924 925 static inline void 926 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 927 { 928 if (server->ops->revert_current_mid) 929 server->ops->revert_current_mid(server, val); 930 } 931 932 static inline void 933 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 934 const struct smb2_hdr *shdr) 935 { 936 unsigned int num = le16_to_cpu(shdr->CreditCharge); 937 938 return revert_current_mid(server, num > 0 ? num : 1); 939 } 940 941 static inline __u16 942 get_mid(const struct smb_hdr *smb) 943 { 944 return le16_to_cpu(smb->Mid); 945 } 946 947 static inline bool 948 compare_mid(__u16 mid, const struct smb_hdr *smb) 949 { 950 return mid == le16_to_cpu(smb->Mid); 951 } 952 953 /* 954 * When the server supports very large reads and writes via POSIX extensions, 955 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 956 * including the RFC1001 length. 957 * 958 * Note that this might make for "interesting" allocation problems during 959 * writeback however as we have to allocate an array of pointers for the 960 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 961 * 962 * For reads, there is a similar problem as we need to allocate an array 963 * of kvecs to handle the receive, though that should only need to be done 964 * once. 965 */ 966 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 967 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 968 969 /* 970 * When the server doesn't allow large posix writes, only allow a rsize/wsize 971 * of 2^17-1 minus the size of the call header. That allows for a read or 972 * write up to the maximum size described by RFC1002. 973 */ 974 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 975 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 976 977 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 978 979 /* 980 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 981 * those values when posix extensions aren't in force. In actuality here, we 982 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 983 * to be ok with the extra byte even though Windows doesn't send writes that 984 * are that large. 985 * 986 * Citation: 987 * 988 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 989 */ 990 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 991 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 992 993 /* 994 * Macros to allow the TCP_Server_Info->net field and related code to drop out 995 * when CONFIG_NET_NS isn't set. 996 */ 997 998 #ifdef CONFIG_NET_NS 999 1000 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1001 { 1002 return srv->net; 1003 } 1004 1005 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1006 { 1007 srv->net = net; 1008 } 1009 1010 #else 1011 1012 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 1013 { 1014 return &init_net; 1015 } 1016 1017 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1018 { 1019 } 1020 1021 #endif 1022 1023 struct cifs_server_iface { 1024 struct list_head iface_head; 1025 struct kref refcount; 1026 size_t speed; 1027 size_t weight_fulfilled; 1028 unsigned int num_channels; 1029 unsigned int rdma_capable : 1; 1030 unsigned int rss_capable : 1; 1031 unsigned int is_active : 1; /* unset if non existent */ 1032 struct sockaddr_storage sockaddr; 1033 }; 1034 1035 /* release iface when last ref is dropped */ 1036 static inline void 1037 release_iface(struct kref *ref) 1038 { 1039 struct cifs_server_iface *iface = container_of(ref, 1040 struct cifs_server_iface, 1041 refcount); 1042 kfree(iface); 1043 } 1044 1045 struct cifs_chan { 1046 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1047 struct TCP_Server_Info *server; 1048 struct cifs_server_iface *iface; /* interface in use */ 1049 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1050 }; 1051 1052 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1053 1054 /* 1055 * Session structure. One of these for each uid session with a particular host 1056 */ 1057 struct cifs_ses { 1058 struct list_head smb_ses_list; 1059 struct list_head rlist; /* reconnect list */ 1060 struct list_head tcon_list; 1061 struct cifs_tcon *tcon_ipc; 1062 spinlock_t ses_lock; /* protect anything here that is not protected */ 1063 struct mutex session_mutex; 1064 struct TCP_Server_Info *server; /* pointer to server info */ 1065 int ses_count; /* reference counter */ 1066 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1067 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1068 char *serverOS; /* name of operating system underlying server */ 1069 char *serverNOS; /* name of network operating system of server */ 1070 char *serverDomain; /* security realm of server */ 1071 __u64 Suid; /* remote smb uid */ 1072 kuid_t linux_uid; /* overriding owner of files on the mount */ 1073 kuid_t cred_uid; /* owner of credentials */ 1074 unsigned int capabilities; 1075 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1076 char *user_name; /* must not be null except during init of sess 1077 and after mount option parsing we fill it */ 1078 char *domainName; 1079 char *password; 1080 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1081 struct session_key auth_key; 1082 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1083 enum securityEnum sectype; /* what security flavor was specified? */ 1084 bool sign; /* is signing required? */ 1085 bool domainAuto:1; 1086 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1087 unsigned int flags; 1088 __u16 session_flags; 1089 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1090 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1091 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1092 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1093 1094 /* 1095 * Network interfaces available on the server this session is 1096 * connected to. 1097 * 1098 * Other channels can be opened by connecting and binding this 1099 * session to interfaces from this list. 1100 * 1101 * iface_lock should be taken when accessing any of these fields 1102 */ 1103 spinlock_t iface_lock; 1104 /* ========= begin: protected by iface_lock ======== */ 1105 struct list_head iface_list; 1106 size_t iface_count; 1107 unsigned long iface_last_update; /* jiffies */ 1108 /* ========= end: protected by iface_lock ======== */ 1109 1110 spinlock_t chan_lock; 1111 /* ========= begin: protected by chan_lock ======== */ 1112 #define CIFS_MAX_CHANNELS 16 1113 #define CIFS_INVAL_CHAN_INDEX (-1) 1114 #define CIFS_ALL_CHANNELS_SET(ses) \ 1115 ((1UL << (ses)->chan_count) - 1) 1116 #define CIFS_ALL_CHANS_GOOD(ses) \ 1117 (!(ses)->chans_need_reconnect) 1118 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1119 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1120 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1121 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1122 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1123 test_bit((index), &(ses)->chans_need_reconnect) 1124 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1125 ((ses)->chans[(index)].in_reconnect) 1126 1127 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1128 size_t chan_count; 1129 size_t chan_max; 1130 atomic_t chan_seq; /* round robin state */ 1131 1132 /* 1133 * chans_need_reconnect is a bitmap indicating which of the channels 1134 * under this smb session needs to be reconnected. 1135 * If not multichannel session, only one bit will be used. 1136 * 1137 * We will ask for sess and tcon reconnection only if all the 1138 * channels are marked for needing reconnection. This will 1139 * enable the sessions on top to continue to live till any 1140 * of the channels below are active. 1141 */ 1142 unsigned long chans_need_reconnect; 1143 /* ========= end: protected by chan_lock ======== */ 1144 struct cifs_ses *dfs_root_ses; 1145 struct nls_table *local_nls; 1146 }; 1147 1148 static inline bool 1149 cap_unix(struct cifs_ses *ses) 1150 { 1151 return ses->server->vals->cap_unix & ses->capabilities; 1152 } 1153 1154 /* 1155 * common struct for holding inode info when searching for or updating an 1156 * inode with new info 1157 */ 1158 1159 #define CIFS_FATTR_JUNCTION 0x1 1160 #define CIFS_FATTR_DELETE_PENDING 0x2 1161 #define CIFS_FATTR_NEED_REVAL 0x4 1162 #define CIFS_FATTR_INO_COLLISION 0x8 1163 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1164 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1165 1166 struct cifs_fattr { 1167 u32 cf_flags; 1168 u32 cf_cifsattrs; 1169 u64 cf_uniqueid; 1170 u64 cf_eof; 1171 u64 cf_bytes; 1172 u64 cf_createtime; 1173 kuid_t cf_uid; 1174 kgid_t cf_gid; 1175 umode_t cf_mode; 1176 dev_t cf_rdev; 1177 unsigned int cf_nlink; 1178 unsigned int cf_dtype; 1179 struct timespec64 cf_atime; 1180 struct timespec64 cf_mtime; 1181 struct timespec64 cf_ctime; 1182 u32 cf_cifstag; 1183 char *cf_symlink_target; 1184 }; 1185 1186 /* 1187 * there is one of these for each connection to a resource on a particular 1188 * session 1189 */ 1190 struct cifs_tcon { 1191 struct list_head tcon_list; 1192 int tc_count; 1193 struct list_head rlist; /* reconnect list */ 1194 spinlock_t tc_lock; /* protect anything here that is not protected */ 1195 atomic_t num_local_opens; /* num of all opens including disconnected */ 1196 atomic_t num_remote_opens; /* num of all network opens on server */ 1197 struct list_head openFileList; 1198 spinlock_t open_file_lock; /* protects list above */ 1199 struct cifs_ses *ses; /* pointer to session associated with */ 1200 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1201 char *nativeFileSystem; 1202 char *password; /* for share-level security */ 1203 __u32 tid; /* The 4 byte tree id */ 1204 __u16 Flags; /* optional support bits */ 1205 enum tid_status_enum status; 1206 atomic_t num_smbs_sent; 1207 union { 1208 struct { 1209 atomic_t num_writes; 1210 atomic_t num_reads; 1211 atomic_t num_flushes; 1212 atomic_t num_oplock_brks; 1213 atomic_t num_opens; 1214 atomic_t num_closes; 1215 atomic_t num_deletes; 1216 atomic_t num_mkdirs; 1217 atomic_t num_posixopens; 1218 atomic_t num_posixmkdirs; 1219 atomic_t num_rmdirs; 1220 atomic_t num_renames; 1221 atomic_t num_t2renames; 1222 atomic_t num_ffirst; 1223 atomic_t num_fnext; 1224 atomic_t num_fclose; 1225 atomic_t num_hardlinks; 1226 atomic_t num_symlinks; 1227 atomic_t num_locks; 1228 atomic_t num_acl_get; 1229 atomic_t num_acl_set; 1230 } cifs_stats; 1231 struct { 1232 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1233 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1234 } smb2_stats; 1235 } stats; 1236 __u64 bytes_read; 1237 __u64 bytes_written; 1238 spinlock_t stat_lock; /* protects the two fields above */ 1239 time64_t stats_from_time; 1240 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1241 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1242 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1243 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1244 bool pipe:1; /* set if connection to pipe share */ 1245 bool print:1; /* set if connection to printer share */ 1246 bool retry:1; 1247 bool nocase:1; 1248 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1249 bool nodelete:1; 1250 bool seal:1; /* transport encryption for this mounted share */ 1251 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1252 for this mount even if server would support */ 1253 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1254 bool local_lease:1; /* check leases (only) on local system not remote */ 1255 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1256 bool broken_sparse_sup; /* if server or share does not support sparse */ 1257 bool need_reconnect:1; /* connection reset, tid now invalid */ 1258 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1259 bool use_resilient:1; /* use resilient instead of durable handles */ 1260 bool use_persistent:1; /* use persistent instead of durable handles */ 1261 bool no_lease:1; /* Do not request leases on files or directories */ 1262 bool use_witness:1; /* use witness protocol */ 1263 __le32 capabilities; 1264 __u32 share_flags; 1265 __u32 maximal_access; 1266 __u32 vol_serial_number; 1267 __le64 vol_create_time; 1268 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1269 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1270 __u32 ss_flags; /* sector size flags */ 1271 __u32 perf_sector_size; /* best sector size for perf */ 1272 __u32 max_chunks; 1273 __u32 max_bytes_chunk; 1274 __u32 max_bytes_copy; 1275 __u32 max_cached_dirs; 1276 #ifdef CONFIG_CIFS_FSCACHE 1277 u64 resource_id; /* server resource id */ 1278 struct fscache_volume *fscache; /* cookie for share */ 1279 #endif 1280 struct list_head pending_opens; /* list of incomplete opens */ 1281 struct cached_fids *cfids; 1282 /* BB add field for back pointer to sb struct(s)? */ 1283 #ifdef CONFIG_CIFS_DFS_UPCALL 1284 struct list_head dfs_ses_list; 1285 struct delayed_work dfs_cache_work; 1286 #endif 1287 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1288 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1289 }; 1290 1291 /* 1292 * This is a refcounted and timestamped container for a tcon pointer. The 1293 * container holds a tcon reference. It is considered safe to free one of 1294 * these when the tl_count goes to 0. The tl_time is the time of the last 1295 * "get" on the container. 1296 */ 1297 struct tcon_link { 1298 struct rb_node tl_rbnode; 1299 kuid_t tl_uid; 1300 unsigned long tl_flags; 1301 #define TCON_LINK_MASTER 0 1302 #define TCON_LINK_PENDING 1 1303 #define TCON_LINK_IN_TREE 2 1304 unsigned long tl_time; 1305 atomic_t tl_count; 1306 struct cifs_tcon *tl_tcon; 1307 }; 1308 1309 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1310 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1311 1312 static inline struct cifs_tcon * 1313 tlink_tcon(struct tcon_link *tlink) 1314 { 1315 return tlink->tl_tcon; 1316 } 1317 1318 static inline struct tcon_link * 1319 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1320 { 1321 return cifs_sb->master_tlink; 1322 } 1323 1324 extern void cifs_put_tlink(struct tcon_link *tlink); 1325 1326 static inline struct tcon_link * 1327 cifs_get_tlink(struct tcon_link *tlink) 1328 { 1329 if (tlink && !IS_ERR(tlink)) 1330 atomic_inc(&tlink->tl_count); 1331 return tlink; 1332 } 1333 1334 /* This function is always expected to succeed */ 1335 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1336 1337 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1338 1339 struct cifs_pending_open { 1340 struct list_head olist; 1341 struct tcon_link *tlink; 1342 __u8 lease_key[16]; 1343 __u32 oplock; 1344 }; 1345 1346 struct cifs_deferred_close { 1347 struct list_head dlist; 1348 struct tcon_link *tlink; 1349 __u16 netfid; 1350 __u64 persistent_fid; 1351 __u64 volatile_fid; 1352 }; 1353 1354 /* 1355 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1356 * This is used to track byte stream locks on the file 1357 */ 1358 struct cifsLockInfo { 1359 struct list_head llist; /* pointer to next cifsLockInfo */ 1360 struct list_head blist; /* pointer to locks blocked on this */ 1361 wait_queue_head_t block_q; 1362 __u64 offset; 1363 __u64 length; 1364 __u32 pid; 1365 __u16 type; 1366 __u16 flags; 1367 }; 1368 1369 /* 1370 * One of these for each open instance of a file 1371 */ 1372 struct cifs_search_info { 1373 loff_t index_of_last_entry; 1374 __u16 entries_in_buffer; 1375 __u16 info_level; 1376 __u32 resume_key; 1377 char *ntwrk_buf_start; 1378 char *srch_entries_start; 1379 char *last_entry; 1380 const char *presume_name; 1381 unsigned int resume_name_len; 1382 bool endOfSearch:1; 1383 bool emptyDir:1; 1384 bool unicode:1; 1385 bool smallBuf:1; /* so we know which buf_release function to call */ 1386 }; 1387 1388 #define ACL_NO_MODE ((umode_t)(-1)) 1389 struct cifs_open_parms { 1390 struct cifs_tcon *tcon; 1391 struct cifs_sb_info *cifs_sb; 1392 int disposition; 1393 int desired_access; 1394 int create_options; 1395 const char *path; 1396 struct cifs_fid *fid; 1397 umode_t mode; 1398 bool reconnect:1; 1399 bool replay:1; /* indicates that this open is for a replay */ 1400 struct kvec *ea_cctx; 1401 }; 1402 1403 struct cifs_fid { 1404 __u16 netfid; 1405 __u64 persistent_fid; /* persist file id for smb2 */ 1406 __u64 volatile_fid; /* volatile file id for smb2 */ 1407 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1408 __u8 create_guid[16]; 1409 __u32 access; 1410 struct cifs_pending_open *pending_open; 1411 unsigned int epoch; 1412 #ifdef CONFIG_CIFS_DEBUG2 1413 __u64 mid; 1414 #endif /* CIFS_DEBUG2 */ 1415 bool purge_cache; 1416 }; 1417 1418 struct cifs_fid_locks { 1419 struct list_head llist; 1420 struct cifsFileInfo *cfile; /* fid that owns locks */ 1421 struct list_head locks; /* locks held by fid above */ 1422 }; 1423 1424 struct cifsFileInfo { 1425 /* following two lists are protected by tcon->open_file_lock */ 1426 struct list_head tlist; /* pointer to next fid owned by tcon */ 1427 struct list_head flist; /* next fid (file instance) for this inode */ 1428 /* lock list below protected by cifsi->lock_sem */ 1429 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1430 kuid_t uid; /* allows finding which FileInfo structure */ 1431 __u32 pid; /* process id who opened file */ 1432 struct cifs_fid fid; /* file id from remote */ 1433 struct list_head rlist; /* reconnect list */ 1434 /* BB add lock scope info here if needed */ 1435 /* lock scope id (0 if none) */ 1436 struct dentry *dentry; 1437 struct tcon_link *tlink; 1438 unsigned int f_flags; 1439 bool invalidHandle:1; /* file closed via session abend */ 1440 bool swapfile:1; 1441 bool oplock_break_cancelled:1; 1442 bool status_file_deleted:1; /* file has been deleted */ 1443 unsigned int oplock_epoch; /* epoch from the lease break */ 1444 __u32 oplock_level; /* oplock/lease level from the lease break */ 1445 int count; 1446 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1447 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1448 struct cifs_search_info srch_inf; 1449 struct work_struct oplock_break; /* work for oplock breaks */ 1450 struct work_struct put; /* work for the final part of _put */ 1451 struct delayed_work deferred; 1452 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1453 char *symlink_target; 1454 }; 1455 1456 struct cifs_io_parms { 1457 __u16 netfid; 1458 __u64 persistent_fid; /* persist file id for smb2 */ 1459 __u64 volatile_fid; /* volatile file id for smb2 */ 1460 __u32 pid; 1461 __u64 offset; 1462 unsigned int length; 1463 struct cifs_tcon *tcon; 1464 struct TCP_Server_Info *server; 1465 }; 1466 1467 struct cifs_aio_ctx { 1468 struct kref refcount; 1469 struct list_head list; 1470 struct mutex aio_mutex; 1471 struct completion done; 1472 struct iov_iter iter; 1473 struct kiocb *iocb; 1474 struct cifsFileInfo *cfile; 1475 struct bio_vec *bv; 1476 loff_t pos; 1477 unsigned int nr_pinned_pages; 1478 ssize_t rc; 1479 unsigned int len; 1480 unsigned int total_len; 1481 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1482 bool should_dirty; 1483 /* 1484 * Indicates if this aio_ctx is for direct_io, 1485 * If yes, iter is a copy of the user passed iov_iter 1486 */ 1487 bool direct_io; 1488 }; 1489 1490 /* asynchronous read support */ 1491 struct cifs_readdata { 1492 struct kref refcount; 1493 struct list_head list; 1494 struct completion done; 1495 struct cifsFileInfo *cfile; 1496 struct address_space *mapping; 1497 struct cifs_aio_ctx *ctx; 1498 __u64 offset; 1499 ssize_t got_bytes; 1500 unsigned int bytes; 1501 pid_t pid; 1502 int result; 1503 struct work_struct work; 1504 struct iov_iter iter; 1505 struct kvec iov[2]; 1506 struct TCP_Server_Info *server; 1507 #ifdef CONFIG_CIFS_SMB_DIRECT 1508 struct smbd_mr *mr; 1509 #endif 1510 struct cifs_credits credits; 1511 }; 1512 1513 /* asynchronous write support */ 1514 struct cifs_writedata { 1515 struct kref refcount; 1516 struct list_head list; 1517 struct completion done; 1518 enum writeback_sync_modes sync_mode; 1519 struct work_struct work; 1520 struct cifsFileInfo *cfile; 1521 struct cifs_aio_ctx *ctx; 1522 struct iov_iter iter; 1523 struct bio_vec *bv; 1524 __u64 offset; 1525 pid_t pid; 1526 unsigned int bytes; 1527 int result; 1528 struct TCP_Server_Info *server; 1529 #ifdef CONFIG_CIFS_SMB_DIRECT 1530 struct smbd_mr *mr; 1531 #endif 1532 struct cifs_credits credits; 1533 bool replay; 1534 }; 1535 1536 /* 1537 * Take a reference on the file private data. Must be called with 1538 * cfile->file_info_lock held. 1539 */ 1540 static inline void 1541 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1542 { 1543 ++cifs_file->count; 1544 } 1545 1546 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1547 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1548 bool offload); 1549 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1550 1551 #define CIFS_CACHE_READ_FLG 1 1552 #define CIFS_CACHE_HANDLE_FLG 2 1553 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1554 #define CIFS_CACHE_WRITE_FLG 4 1555 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1556 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1557 1558 #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)) 1559 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1560 #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)) 1561 1562 /* 1563 * One of these for each file inode 1564 */ 1565 1566 struct cifsInodeInfo { 1567 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1568 bool can_cache_brlcks; 1569 struct list_head llist; /* locks helb by this inode */ 1570 /* 1571 * NOTE: Some code paths call down_read(lock_sem) twice, so 1572 * we must always use cifs_down_write() instead of down_write() 1573 * for this semaphore to avoid deadlocks. 1574 */ 1575 struct rw_semaphore lock_sem; /* protect the fields above */ 1576 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1577 struct list_head openFileList; 1578 spinlock_t open_file_lock; /* protects openFileList */ 1579 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1580 unsigned int oplock; /* oplock/lease level we have */ 1581 unsigned int epoch; /* used to track lease state changes */ 1582 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1583 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1584 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1585 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1586 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1587 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1588 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1589 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1590 unsigned long flags; 1591 spinlock_t writers_lock; 1592 unsigned int writers; /* Number of writers on this inode */ 1593 unsigned long time; /* jiffies of last update of inode */ 1594 u64 uniqueid; /* server inode number */ 1595 u64 createtime; /* creation time on server */ 1596 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1597 struct list_head deferred_closes; /* list of deferred closes */ 1598 spinlock_t deferred_lock; /* protection on deferred list */ 1599 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1600 char *symlink_target; 1601 __u32 reparse_tag; 1602 }; 1603 1604 static inline struct cifsInodeInfo * 1605 CIFS_I(struct inode *inode) 1606 { 1607 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1608 } 1609 1610 static inline struct cifs_sb_info * 1611 CIFS_SB(struct super_block *sb) 1612 { 1613 return sb->s_fs_info; 1614 } 1615 1616 static inline struct cifs_sb_info * 1617 CIFS_FILE_SB(struct file *file) 1618 { 1619 return CIFS_SB(file_inode(file)->i_sb); 1620 } 1621 1622 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1623 { 1624 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1625 return '/'; 1626 else 1627 return '\\'; 1628 } 1629 1630 static inline void 1631 convert_delimiter(char *path, char delim) 1632 { 1633 char old_delim, *pos; 1634 1635 if (delim == '/') 1636 old_delim = '\\'; 1637 else 1638 old_delim = '/'; 1639 1640 pos = path; 1641 while ((pos = strchr(pos, old_delim))) 1642 *pos = delim; 1643 } 1644 1645 #define cifs_stats_inc atomic_inc 1646 1647 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1648 unsigned int bytes) 1649 { 1650 if (bytes) { 1651 spin_lock(&tcon->stat_lock); 1652 tcon->bytes_written += bytes; 1653 spin_unlock(&tcon->stat_lock); 1654 } 1655 } 1656 1657 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1658 unsigned int bytes) 1659 { 1660 spin_lock(&tcon->stat_lock); 1661 tcon->bytes_read += bytes; 1662 spin_unlock(&tcon->stat_lock); 1663 } 1664 1665 1666 /* 1667 * This is the prototype for the mid receive function. This function is for 1668 * receiving the rest of the SMB frame, starting with the WordCount (which is 1669 * just after the MID in struct smb_hdr). Note: 1670 * 1671 * - This will be called by cifsd, with no locks held. 1672 * - The mid will still be on the pending_mid_q. 1673 * - mid->resp_buf will point to the current buffer. 1674 * 1675 * Returns zero on a successful receive, or an error. The receive state in 1676 * the TCP_Server_Info will also be updated. 1677 */ 1678 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1679 struct mid_q_entry *mid); 1680 1681 /* 1682 * This is the prototype for the mid callback function. This is called once the 1683 * mid has been received off of the socket. When creating one, take special 1684 * care to avoid deadlocks. Things to bear in mind: 1685 * 1686 * - it will be called by cifsd, with no locks held 1687 * - the mid will be removed from any lists 1688 */ 1689 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1690 1691 /* 1692 * This is the protopyte for mid handle function. This is called once the mid 1693 * has been recognized after decryption of the message. 1694 */ 1695 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1696 struct mid_q_entry *mid); 1697 1698 /* one of these for every pending CIFS request to the server */ 1699 struct mid_q_entry { 1700 struct list_head qhead; /* mids waiting on reply from this server */ 1701 struct kref refcount; 1702 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1703 __u64 mid; /* multiplex id */ 1704 __u16 credits; /* number of credits consumed by this mid */ 1705 __u16 credits_received; /* number of credits from the response */ 1706 __u32 pid; /* process id */ 1707 __u32 sequence_number; /* for CIFS signing */ 1708 unsigned long when_alloc; /* when mid was created */ 1709 #ifdef CONFIG_CIFS_STATS2 1710 unsigned long when_sent; /* time when smb send finished */ 1711 unsigned long when_received; /* when demux complete (taken off wire) */ 1712 #endif 1713 mid_receive_t *receive; /* call receive callback */ 1714 mid_callback_t *callback; /* call completion callback */ 1715 mid_handle_t *handle; /* call handle mid callback */ 1716 void *callback_data; /* general purpose pointer for callback */ 1717 struct task_struct *creator; 1718 void *resp_buf; /* pointer to received SMB header */ 1719 unsigned int resp_buf_size; 1720 int mid_state; /* wish this were enum but can not pass to wait_event */ 1721 unsigned int mid_flags; 1722 __le16 command; /* smb command code */ 1723 unsigned int optype; /* operation type */ 1724 bool large_buf:1; /* if valid response, is pointer to large buf */ 1725 bool multiRsp:1; /* multiple trans2 responses for one request */ 1726 bool multiEnd:1; /* both received */ 1727 bool decrypted:1; /* decrypted entry */ 1728 }; 1729 1730 struct close_cancelled_open { 1731 struct cifs_fid fid; 1732 struct cifs_tcon *tcon; 1733 struct work_struct work; 1734 __u64 mid; 1735 __u16 cmd; 1736 }; 1737 1738 /* Make code in transport.c a little cleaner by moving 1739 update of optional stats into function below */ 1740 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1741 { 1742 atomic_inc(&server->in_send); 1743 } 1744 1745 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1746 { 1747 atomic_dec(&server->in_send); 1748 } 1749 1750 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1751 { 1752 atomic_inc(&server->num_waiters); 1753 } 1754 1755 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1756 { 1757 atomic_dec(&server->num_waiters); 1758 } 1759 1760 #ifdef CONFIG_CIFS_STATS2 1761 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1762 { 1763 mid->when_sent = jiffies; 1764 } 1765 #else 1766 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1767 { 1768 } 1769 #endif 1770 1771 /* for pending dnotify requests */ 1772 struct dir_notify_req { 1773 struct list_head lhead; 1774 __le16 Pid; 1775 __le16 PidHigh; 1776 __u16 Mid; 1777 __u16 Tid; 1778 __u16 Uid; 1779 __u16 netfid; 1780 __u32 filter; /* CompletionFilter (for multishot) */ 1781 int multishot; 1782 struct file *pfile; 1783 }; 1784 1785 struct dfs_info3_param { 1786 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1787 int path_consumed; 1788 int server_type; 1789 int ref_flag; 1790 char *path_name; 1791 char *node_name; 1792 int ttl; 1793 }; 1794 1795 struct file_list { 1796 struct list_head list; 1797 struct cifsFileInfo *cfile; 1798 }; 1799 1800 struct cifs_mount_ctx { 1801 struct cifs_sb_info *cifs_sb; 1802 struct smb3_fs_context *fs_ctx; 1803 unsigned int xid; 1804 struct TCP_Server_Info *server; 1805 struct cifs_ses *ses; 1806 struct cifs_tcon *tcon; 1807 struct list_head dfs_ses_list; 1808 }; 1809 1810 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1811 { 1812 kfree(param->path_name); 1813 kfree(param->node_name); 1814 } 1815 1816 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1817 { 1818 if (param) 1819 __free_dfs_info_param(param); 1820 } 1821 1822 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1823 { 1824 if (param) { 1825 __free_dfs_info_param(param); 1826 memset(param, 0, sizeof(*param)); 1827 } 1828 } 1829 1830 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1831 int number_of_items) 1832 { 1833 int i; 1834 1835 if ((number_of_items == 0) || (param == NULL)) 1836 return; 1837 for (i = 0; i < number_of_items; i++) { 1838 kfree(param[i].path_name); 1839 kfree(param[i].node_name); 1840 } 1841 kfree(param); 1842 } 1843 1844 static inline bool is_interrupt_error(int error) 1845 { 1846 switch (error) { 1847 case -EINTR: 1848 case -ERESTARTSYS: 1849 case -ERESTARTNOHAND: 1850 case -ERESTARTNOINTR: 1851 return true; 1852 } 1853 return false; 1854 } 1855 1856 static inline bool is_retryable_error(int error) 1857 { 1858 if (is_interrupt_error(error) || error == -EAGAIN) 1859 return true; 1860 return false; 1861 } 1862 1863 static inline bool is_replayable_error(int error) 1864 { 1865 if (error == -EAGAIN || error == -ECONNABORTED) 1866 return true; 1867 return false; 1868 } 1869 1870 1871 /* cifs_get_writable_file() flags */ 1872 #define FIND_WR_ANY 0 1873 #define FIND_WR_FSUID_ONLY 1 1874 #define FIND_WR_WITH_DELETE 2 1875 1876 #define MID_FREE 0 1877 #define MID_REQUEST_ALLOCATED 1 1878 #define MID_REQUEST_SUBMITTED 2 1879 #define MID_RESPONSE_RECEIVED 4 1880 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1881 #define MID_RESPONSE_MALFORMED 0x10 1882 #define MID_SHUTDOWN 0x20 1883 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1884 1885 /* Flags */ 1886 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1887 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1888 1889 /* Types of response buffer returned from SendReceive2 */ 1890 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1891 #define CIFS_SMALL_BUFFER 1 1892 #define CIFS_LARGE_BUFFER 2 1893 #define CIFS_IOVEC 4 /* array of response buffers */ 1894 1895 /* Type of Request to SendReceive2 */ 1896 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1897 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1898 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1899 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1900 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1901 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1902 1903 /* Type of request operation */ 1904 #define CIFS_ECHO_OP 0x080 /* echo request */ 1905 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1906 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1907 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1908 /* Lower bitmask values are reserved by others below. */ 1909 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1910 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1911 1912 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1913 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1914 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1915 1916 /* Security Flags: indicate type of session setup needed */ 1917 #define CIFSSEC_MAY_SIGN 0x00001 1918 #define CIFSSEC_MAY_NTLMV2 0x00004 1919 #define CIFSSEC_MAY_KRB5 0x00008 1920 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1921 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1922 1923 #define CIFSSEC_MUST_SIGN 0x01001 1924 /* note that only one of the following can be set so the 1925 result of setting MUST flags more than once will be to 1926 require use of the stronger protocol */ 1927 #define CIFSSEC_MUST_NTLMV2 0x04004 1928 #define CIFSSEC_MUST_KRB5 0x08008 1929 #ifdef CONFIG_CIFS_UPCALL 1930 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1931 #else 1932 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1933 #endif /* UPCALL */ 1934 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1935 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1936 1937 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1938 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1939 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1940 /* 1941 ***************************************************************** 1942 * All constants go here 1943 ***************************************************************** 1944 */ 1945 1946 #define UID_HASH (16) 1947 1948 /* 1949 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1950 * following to be declared. 1951 */ 1952 1953 /**************************************************************************** 1954 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1955 * to the locking order. i.e. if two locks are to be held together, the lock that 1956 * appears higher in this list needs to be taken before the other. 1957 * 1958 * If you hold a lock that is lower in this list, and you need to take a higher lock 1959 * (or if you think that one of the functions that you're calling may need to), first 1960 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1961 * ensure that locks are picked up only in one direction in the below table 1962 * (top to bottom). 1963 * 1964 * Also, if you expect a function to be called with a lock held, explicitly document 1965 * this in the comments on top of your function definition. 1966 * 1967 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1968 * possible. Blocking / calling other functions with a lock held always increase 1969 * the risk of a possible deadlock. 1970 * 1971 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1972 * debug. Also, any new lock that you introduce, please add to this list in the correct 1973 * order. 1974 * 1975 * Please populate this list whenever you introduce new locks in your changes. Or in 1976 * case I've missed some existing locks. Please ensure that it's added in the list 1977 * based on the locking order expected. 1978 * 1979 * ===================================================================================== 1980 * Lock Protects Initialization fn 1981 * ===================================================================================== 1982 * vol_list_lock 1983 * vol_info->ctx_lock vol_info->ctx 1984 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1985 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1986 * reconnect_mutex 1987 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1988 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1989 * cifs_tcon 1990 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1991 * cifs_tcon->pending_opens 1992 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1993 * cifs_tcon->bytes_written 1994 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1995 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1996 * GlobalCurrentXid 1997 * GlobalTotalActiveXid 1998 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1999 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 2000 * ->CurrentMid 2001 * (any changes in mid_q_entry fields) 2002 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 2003 * ->credits 2004 * ->echo_credits 2005 * ->oplock_credits 2006 * ->reconnect_instance 2007 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 2008 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 2009 * ->iface_count 2010 * ->iface_last_update 2011 * cifs_ses->chan_lock cifs_ses->chans 2012 * ->chans_need_reconnect 2013 * ->chans_in_reconnect 2014 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 2015 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 2016 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 2017 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 2018 * ->can_cache_brlcks 2019 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 2020 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 2021 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 2022 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 2023 * ->invalidHandle initiate_cifs_search 2024 * ->oplock_break_cancelled 2025 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 2026 ****************************************************************************/ 2027 2028 #ifdef DECLARE_GLOBALS_HERE 2029 #define GLOBAL_EXTERN 2030 #else 2031 #define GLOBAL_EXTERN extern 2032 #endif 2033 2034 /* 2035 * the list of TCP_Server_Info structures, ie each of the sockets 2036 * connecting our client to a distinct server (ip address), is 2037 * chained together by cifs_tcp_ses_list. The list of all our SMB 2038 * sessions (and from that the tree connections) can be found 2039 * by iterating over cifs_tcp_ses_list 2040 */ 2041 extern struct list_head cifs_tcp_ses_list; 2042 2043 /* 2044 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2045 * tcp session, and the list of tcon's per smb session. It also protects 2046 * the reference counters for the server, smb session, and tcon. 2047 * generally the locks should be taken in order tcp_ses_lock before 2048 * tcon->open_file_lock and that before file->file_info_lock since the 2049 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2050 */ 2051 extern spinlock_t cifs_tcp_ses_lock; 2052 2053 /* 2054 * Global transaction id (XID) information 2055 */ 2056 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2057 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2058 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2059 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2060 2061 /* 2062 * Global counters, updated atomically 2063 */ 2064 extern atomic_t sesInfoAllocCount; 2065 extern atomic_t tconInfoAllocCount; 2066 extern atomic_t tcpSesNextId; 2067 extern atomic_t tcpSesAllocCount; 2068 extern atomic_t tcpSesReconnectCount; 2069 extern atomic_t tconInfoReconnectCount; 2070 2071 /* Various Debug counters */ 2072 extern atomic_t buf_alloc_count; /* current number allocated */ 2073 extern atomic_t small_buf_alloc_count; 2074 #ifdef CONFIG_CIFS_STATS2 2075 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2076 extern atomic_t total_small_buf_alloc_count; 2077 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2078 #endif 2079 2080 /* Misc globals */ 2081 extern bool enable_oplocks; /* enable or disable oplocks */ 2082 extern bool lookupCacheEnabled; 2083 extern unsigned int global_secflags; /* if on, session setup sent 2084 with more secure ntlmssp2 challenge/resp */ 2085 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2086 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2087 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2088 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2089 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2090 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2091 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2092 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2093 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2094 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2095 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2096 extern atomic_t mid_count; 2097 2098 void cifs_oplock_break(struct work_struct *work); 2099 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2100 void smb2_deferred_work_close(struct work_struct *work); 2101 2102 extern const struct slow_work_ops cifs_oplock_break_ops; 2103 extern struct workqueue_struct *cifsiod_wq; 2104 extern struct workqueue_struct *decrypt_wq; 2105 extern struct workqueue_struct *fileinfo_put_wq; 2106 extern struct workqueue_struct *cifsoplockd_wq; 2107 extern struct workqueue_struct *deferredclose_wq; 2108 extern __u32 cifs_lock_secret; 2109 2110 extern mempool_t *cifs_sm_req_poolp; 2111 extern mempool_t *cifs_req_poolp; 2112 extern mempool_t *cifs_mid_poolp; 2113 2114 /* Operations for different SMB versions */ 2115 #define SMB1_VERSION_STRING "1.0" 2116 #define SMB20_VERSION_STRING "2.0" 2117 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2118 extern struct smb_version_operations smb1_operations; 2119 extern struct smb_version_values smb1_values; 2120 extern struct smb_version_operations smb20_operations; 2121 extern struct smb_version_values smb20_values; 2122 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2123 #define SMB21_VERSION_STRING "2.1" 2124 extern struct smb_version_operations smb21_operations; 2125 extern struct smb_version_values smb21_values; 2126 #define SMBDEFAULT_VERSION_STRING "default" 2127 extern struct smb_version_values smbdefault_values; 2128 #define SMB3ANY_VERSION_STRING "3" 2129 extern struct smb_version_values smb3any_values; 2130 #define SMB30_VERSION_STRING "3.0" 2131 extern struct smb_version_operations smb30_operations; 2132 extern struct smb_version_values smb30_values; 2133 #define SMB302_VERSION_STRING "3.02" 2134 #define ALT_SMB302_VERSION_STRING "3.0.2" 2135 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2136 extern struct smb_version_values smb302_values; 2137 #define SMB311_VERSION_STRING "3.1.1" 2138 #define ALT_SMB311_VERSION_STRING "3.11" 2139 extern struct smb_version_operations smb311_operations; 2140 extern struct smb_version_values smb311_values; 2141 2142 static inline char *get_security_type_str(enum securityEnum sectype) 2143 { 2144 switch (sectype) { 2145 case RawNTLMSSP: 2146 return "RawNTLMSSP"; 2147 case Kerberos: 2148 return "Kerberos"; 2149 case NTLMv2: 2150 return "NTLMv2"; 2151 default: 2152 return "Unknown"; 2153 } 2154 } 2155 2156 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2157 { 2158 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2159 } 2160 2161 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2162 { 2163 /* 2164 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2165 * Subsystem Notifies That a Share Is a DFS Share. 2166 * 2167 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2168 * Application Updates a Share. 2169 */ 2170 if (!tcon || !tcon->ses || !tcon->ses->server) 2171 return false; 2172 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2173 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2174 } 2175 2176 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2177 const struct dfs_info3_param *ref) 2178 { 2179 /* 2180 * Check if all targets are capable of handling DFS referrals as per 2181 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2182 */ 2183 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2184 } 2185 2186 static inline u64 cifs_flock_len(const struct file_lock *fl) 2187 { 2188 return (u64)fl->fl_end - fl->fl_start + 1; 2189 } 2190 2191 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2192 { 2193 if (WARN_ON_ONCE(!ses || !ses->server)) 2194 return 0; 2195 /* 2196 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2197 * servers do require it during NTLMSSP. 2198 */ 2199 if (ses->server->dialect <= SMB20_PROT_ID) 2200 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2201 return sizeof(ses->workstation_name); 2202 } 2203 2204 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2205 { 2206 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2207 dst->AccessFlags = src->AccessFlags; 2208 dst->CurrentByteOffset = src->CurrentByteOffset; 2209 dst->Mode = src->Mode; 2210 dst->AlignmentRequirement = src->AlignmentRequirement; 2211 dst->FileNameLength = src->FileNameLength; 2212 } 2213 2214 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2215 int num_rqst, 2216 const u8 *sig) 2217 { 2218 unsigned int len, skip; 2219 unsigned int nents = 0; 2220 unsigned long addr; 2221 size_t data_size; 2222 int i, j; 2223 2224 /* 2225 * The first rqst has a transform header where the first 20 bytes are 2226 * not part of the encrypted blob. 2227 */ 2228 skip = 20; 2229 2230 /* Assumes the first rqst has a transform header as the first iov. 2231 * I.e. 2232 * rqst[0].rq_iov[0] is transform header 2233 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2234 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2235 */ 2236 for (i = 0; i < num_rqst; i++) { 2237 data_size = iov_iter_count(&rqst[i].rq_iter); 2238 2239 /* We really don't want a mixture of pinned and unpinned pages 2240 * in the sglist. It's hard to keep track of which is what. 2241 * Instead, we convert to a BVEC-type iterator higher up. 2242 */ 2243 if (data_size && 2244 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2245 return -EIO; 2246 2247 /* We also don't want to have any extra refs or pins to clean 2248 * up in the sglist. 2249 */ 2250 if (data_size && 2251 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2252 return -EIO; 2253 2254 for (j = 0; j < rqst[i].rq_nvec; j++) { 2255 struct kvec *iov = &rqst[i].rq_iov[j]; 2256 2257 addr = (unsigned long)iov->iov_base + skip; 2258 if (unlikely(is_vmalloc_addr((void *)addr))) { 2259 len = iov->iov_len - skip; 2260 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2261 PAGE_SIZE); 2262 } else { 2263 nents++; 2264 } 2265 skip = 0; 2266 } 2267 if (data_size) 2268 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2269 } 2270 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2271 return nents; 2272 } 2273 2274 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2275 * stack object as buf. 2276 */ 2277 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2278 const void *buf, 2279 unsigned int buflen) 2280 { 2281 unsigned long addr = (unsigned long)buf; 2282 unsigned int off = offset_in_page(addr); 2283 2284 addr &= PAGE_MASK; 2285 if (unlikely(is_vmalloc_addr((void *)addr))) { 2286 do { 2287 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2288 2289 sg_set_page(&sgtable->sgl[sgtable->nents++], 2290 vmalloc_to_page((void *)addr), len, off); 2291 2292 off = 0; 2293 addr += PAGE_SIZE; 2294 buflen -= len; 2295 } while (buflen); 2296 } else { 2297 sg_set_page(&sgtable->sgl[sgtable->nents++], 2298 virt_to_page((void *)addr), buflen, off); 2299 } 2300 } 2301 2302 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2303 ((struct cifs_open_parms) { \ 2304 .tcon = _tcon, \ 2305 .path = _path, \ 2306 .desired_access = (_da), \ 2307 .disposition = (_cd), \ 2308 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2309 .mode = (_mode), \ 2310 .cifs_sb = _cifs_sb, \ 2311 }) 2312 2313 struct smb2_compound_vars { 2314 struct cifs_open_parms oparms; 2315 struct kvec rsp_iov[MAX_COMPOUND]; 2316 struct smb_rqst rqst[MAX_COMPOUND]; 2317 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2318 struct kvec qi_iov; 2319 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2320 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2321 struct kvec close_iov; 2322 struct smb2_file_rename_info rename_info; 2323 struct smb2_file_link_info link_info; 2324 struct kvec ea_iov; 2325 }; 2326 2327 #endif /* _CIFS_GLOB_H */ 2328