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 struct session_key { 163 unsigned int len; 164 char *response; 165 }; 166 167 /* crypto hashing related structure/fields, not specific to a sec mech */ 168 struct cifs_secmech { 169 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */ 170 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 171 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 172 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 173 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 174 175 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 176 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 177 }; 178 179 /* per smb session structure/fields */ 180 struct ntlmssp_auth { 181 bool sesskey_per_smbsess; /* whether session key is per smb session */ 182 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 183 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 184 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 185 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 186 }; 187 188 struct cifs_cred { 189 int uid; 190 int gid; 191 int mode; 192 int cecount; 193 struct cifs_sid osid; 194 struct cifs_sid gsid; 195 struct cifs_ntace *ntaces; 196 struct cifs_ace *aces; 197 }; 198 199 struct cifs_open_info_data { 200 bool adjust_tz; 201 union { 202 bool reparse_point; 203 bool symlink; 204 }; 205 struct { 206 /* ioctl response buffer */ 207 struct { 208 int buftype; 209 struct kvec iov; 210 } io; 211 __u32 tag; 212 union { 213 struct reparse_data_buffer *buf; 214 struct reparse_posix_data *posix; 215 }; 216 } reparse; 217 char *symlink_target; 218 struct cifs_sid posix_owner; 219 struct cifs_sid posix_group; 220 union { 221 struct smb2_file_all_info fi; 222 struct smb311_posix_qinfo posix_fi; 223 }; 224 }; 225 226 /* 227 ***************************************************************** 228 * Except the CIFS PDUs themselves all the 229 * globally interesting structs should go here 230 ***************************************************************** 231 */ 232 233 /* 234 * A smb_rqst represents a complete request to be issued to a server. It's 235 * formed by a kvec array, followed by an array of pages. Page data is assumed 236 * to start at the beginning of the first page. 237 */ 238 struct smb_rqst { 239 struct kvec *rq_iov; /* array of kvecs */ 240 unsigned int rq_nvec; /* number of kvecs in array */ 241 size_t rq_iter_size; /* Amount of data in ->rq_iter */ 242 struct iov_iter rq_iter; /* Data iterator */ 243 struct xarray rq_buffer; /* Page buffer for encryption */ 244 }; 245 246 struct mid_q_entry; 247 struct TCP_Server_Info; 248 struct cifsFileInfo; 249 struct cifs_ses; 250 struct cifs_tcon; 251 struct dfs_info3_param; 252 struct cifs_fattr; 253 struct smb3_fs_context; 254 struct cifs_fid; 255 struct cifs_readdata; 256 struct cifs_writedata; 257 struct cifs_io_parms; 258 struct cifs_search_info; 259 struct cifsInodeInfo; 260 struct cifs_open_parms; 261 struct cifs_credits; 262 263 struct smb_version_operations { 264 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 265 struct mid_q_entry *); 266 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 267 /* setup request: allocate mid, sign message */ 268 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 269 struct TCP_Server_Info *, 270 struct smb_rqst *); 271 /* setup async request: allocate mid, sign message */ 272 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 273 struct smb_rqst *); 274 /* check response: verify signature, map error */ 275 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 276 bool); 277 void (*add_credits)(struct TCP_Server_Info *server, 278 const struct cifs_credits *credits, 279 const int optype); 280 void (*set_credits)(struct TCP_Server_Info *, const int); 281 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 282 unsigned int (*get_credits)(struct mid_q_entry *); 283 __u64 (*get_next_mid)(struct TCP_Server_Info *); 284 void (*revert_current_mid)(struct TCP_Server_Info *server, 285 const unsigned int val); 286 /* data offset from read response message */ 287 unsigned int (*read_data_offset)(char *); 288 /* 289 * Data length from read response message 290 * When in_remaining is true, the returned data length is in 291 * message field DataRemaining for out-of-band data read (e.g through 292 * Memory Registration RDMA write in SMBD). 293 * Otherwise, the returned data length is in message field DataLength. 294 */ 295 unsigned int (*read_data_length)(char *, bool in_remaining); 296 /* map smb to linux error */ 297 int (*map_error)(char *, bool); 298 /* find mid corresponding to the response message */ 299 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 300 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 301 void (*clear_stats)(struct cifs_tcon *); 302 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 303 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 304 /* verify the message */ 305 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 306 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 307 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 308 void (*downgrade_oplock)(struct TCP_Server_Info *server, 309 struct cifsInodeInfo *cinode, __u32 oplock, 310 unsigned int epoch, bool *purge_cache); 311 /* process transaction2 response */ 312 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 313 char *, int); 314 /* check if we need to negotiate */ 315 bool (*need_neg)(struct TCP_Server_Info *); 316 /* negotiate to the server */ 317 int (*negotiate)(const unsigned int xid, 318 struct cifs_ses *ses, 319 struct TCP_Server_Info *server); 320 /* set negotiated write size */ 321 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 322 /* set negotiated read size */ 323 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 324 /* setup smb sessionn */ 325 int (*sess_setup)(const unsigned int, struct cifs_ses *, 326 struct TCP_Server_Info *server, 327 const struct nls_table *); 328 /* close smb session */ 329 int (*logoff)(const unsigned int, struct cifs_ses *); 330 /* connect to a server share */ 331 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 332 struct cifs_tcon *, const struct nls_table *); 333 /* close tree connecion */ 334 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 335 /* get DFS referrals */ 336 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 337 const char *, struct dfs_info3_param **, 338 unsigned int *, const struct nls_table *, int); 339 /* informational QFS call */ 340 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 341 struct cifs_sb_info *); 342 /* query for server interfaces */ 343 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 344 bool); 345 /* check if a path is accessible or not */ 346 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 347 struct cifs_sb_info *, const char *); 348 /* query path data from the server */ 349 int (*query_path_info)(const unsigned int xid, 350 struct cifs_tcon *tcon, 351 struct cifs_sb_info *cifs_sb, 352 const char *full_path, 353 struct cifs_open_info_data *data); 354 /* query file data from the server */ 355 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 356 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 357 /* query reparse point to determine which type of special file */ 358 int (*query_reparse_point)(const unsigned int xid, 359 struct cifs_tcon *tcon, 360 struct cifs_sb_info *cifs_sb, 361 const char *full_path, 362 u32 *tag, struct kvec *rsp, 363 int *rsp_buftype); 364 /* get server index number */ 365 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 366 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 367 struct cifs_open_info_data *data); 368 /* set size by path */ 369 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 370 const char *, __u64, struct cifs_sb_info *, bool, 371 struct dentry *); 372 /* set size by file handle */ 373 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 374 struct cifsFileInfo *, __u64, bool); 375 /* set attributes */ 376 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 377 const unsigned int); 378 int (*set_compression)(const unsigned int, struct cifs_tcon *, 379 struct cifsFileInfo *); 380 /* check if we can send an echo or nor */ 381 bool (*can_echo)(struct TCP_Server_Info *); 382 /* send echo request */ 383 int (*echo)(struct TCP_Server_Info *); 384 /* create directory */ 385 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 386 umode_t mode, struct cifs_tcon *tcon, 387 const char *full_path, 388 struct cifs_sb_info *cifs_sb); 389 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 390 struct cifs_tcon *tcon, const char *name, 391 struct cifs_sb_info *sb); 392 /* set info on created directory */ 393 void (*mkdir_setinfo)(struct inode *, const char *, 394 struct cifs_sb_info *, struct cifs_tcon *, 395 const unsigned int); 396 /* remove directory */ 397 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 398 struct cifs_sb_info *); 399 /* unlink file */ 400 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 401 struct cifs_sb_info *, struct dentry *); 402 /* open, rename and delete file */ 403 int (*rename_pending_delete)(const char *, struct dentry *, 404 const unsigned int); 405 /* send rename request */ 406 int (*rename)(const unsigned int xid, 407 struct cifs_tcon *tcon, 408 struct dentry *source_dentry, 409 const char *from_name, const char *to_name, 410 struct cifs_sb_info *cifs_sb); 411 /* send create hardlink request */ 412 int (*create_hardlink)(const unsigned int xid, 413 struct cifs_tcon *tcon, 414 struct dentry *source_dentry, 415 const char *from_name, const char *to_name, 416 struct cifs_sb_info *cifs_sb); 417 /* query symlink target */ 418 int (*query_symlink)(const unsigned int xid, 419 struct cifs_tcon *tcon, 420 struct cifs_sb_info *cifs_sb, 421 const char *full_path, 422 char **target_path); 423 /* open a file for non-posix mounts */ 424 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 425 void *buf); 426 /* set fid protocol-specific info */ 427 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 428 /* close a file */ 429 int (*close)(const unsigned int, struct cifs_tcon *, 430 struct cifs_fid *); 431 /* close a file, returning file attributes and timestamps */ 432 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 433 struct cifsFileInfo *pfile_info); 434 /* send a flush request to the server */ 435 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 436 /* async read from the server */ 437 int (*async_readv)(struct cifs_readdata *); 438 /* async write to the server */ 439 int (*async_writev)(struct cifs_writedata *, 440 void (*release)(struct kref *)); 441 /* sync read from the server */ 442 int (*sync_read)(const unsigned int, struct cifs_fid *, 443 struct cifs_io_parms *, unsigned int *, char **, 444 int *); 445 /* sync write to the server */ 446 int (*sync_write)(const unsigned int, struct cifs_fid *, 447 struct cifs_io_parms *, unsigned int *, struct kvec *, 448 unsigned long); 449 /* open dir, start readdir */ 450 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 451 const char *, struct cifs_sb_info *, 452 struct cifs_fid *, __u16, 453 struct cifs_search_info *); 454 /* continue readdir */ 455 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 456 struct cifs_fid *, 457 __u16, struct cifs_search_info *srch_inf); 458 /* close dir */ 459 int (*close_dir)(const unsigned int, struct cifs_tcon *, 460 struct cifs_fid *); 461 /* calculate a size of SMB message */ 462 unsigned int (*calc_smb_size)(void *buf); 463 /* check for STATUS_PENDING and process the response if yes */ 464 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 465 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 466 bool (*is_session_expired)(char *); 467 /* send oplock break response */ 468 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 469 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 470 /* query remote filesystem */ 471 int (*queryfs)(const unsigned int, struct cifs_tcon *, 472 struct cifs_sb_info *, struct kstatfs *); 473 /* send mandatory brlock to the server */ 474 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 475 __u64, __u32, int, int, bool); 476 /* unlock range of mandatory locks */ 477 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 478 const unsigned int); 479 /* push brlocks from the cache to the server */ 480 int (*push_mand_locks)(struct cifsFileInfo *); 481 /* get lease key of the inode */ 482 void (*get_lease_key)(struct inode *, struct cifs_fid *); 483 /* set lease key of the inode */ 484 void (*set_lease_key)(struct inode *, struct cifs_fid *); 485 /* generate new lease key */ 486 void (*new_lease_key)(struct cifs_fid *); 487 int (*generate_signingkey)(struct cifs_ses *ses, 488 struct TCP_Server_Info *server); 489 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 490 bool allocate_crypto); 491 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 492 struct cifsFileInfo *src_file); 493 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 494 struct cifsFileInfo *src_file, void __user *); 495 int (*notify)(const unsigned int xid, struct file *pfile, 496 void __user *pbuf, bool return_changes); 497 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 498 struct cifs_sb_info *, const unsigned char *, 499 char *, unsigned int *); 500 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 501 struct cifs_sb_info *, const unsigned char *, 502 char *, unsigned int *); 503 /* if we can do cache read operations */ 504 bool (*is_read_op)(__u32); 505 /* set oplock level for the inode */ 506 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 507 bool *); 508 /* create lease context buffer for CREATE request */ 509 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 510 /* parse lease context buffer and return oplock/epoch info */ 511 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 512 ssize_t (*copychunk_range)(const unsigned int, 513 struct cifsFileInfo *src_file, 514 struct cifsFileInfo *target_file, 515 u64 src_off, u64 len, u64 dest_off); 516 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 517 struct cifsFileInfo *target_file, u64 src_off, u64 len, 518 u64 dest_off); 519 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 520 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 521 const unsigned char *, const unsigned char *, char *, 522 size_t, struct cifs_sb_info *); 523 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 524 const char *, const void *, const __u16, 525 const struct nls_table *, struct cifs_sb_info *); 526 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 527 const char *, u32 *, u32); 528 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 529 const struct cifs_fid *, u32 *, u32); 530 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 531 int); 532 /* writepages retry size */ 533 unsigned int (*wp_retry_size)(struct inode *); 534 /* get mtu credits */ 535 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 536 unsigned int *, struct cifs_credits *); 537 /* adjust previously taken mtu credits to request size */ 538 int (*adjust_credits)(struct TCP_Server_Info *server, 539 struct cifs_credits *credits, 540 const unsigned int payload_size); 541 /* check if we need to issue closedir */ 542 bool (*dir_needs_close)(struct cifsFileInfo *); 543 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 544 loff_t); 545 /* init transform request - used for encryption for now */ 546 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 547 struct smb_rqst *, struct smb_rqst *); 548 int (*is_transform_hdr)(void *buf); 549 int (*receive_transform)(struct TCP_Server_Info *, 550 struct mid_q_entry **, char **, int *); 551 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 552 enum securityEnum); 553 int (*next_header)(struct TCP_Server_Info *server, char *buf, 554 unsigned int *noff); 555 /* ioctl passthrough for query_info */ 556 int (*ioctl_query_info)(const unsigned int xid, 557 struct cifs_tcon *tcon, 558 struct cifs_sb_info *cifs_sb, 559 __le16 *path, int is_dir, 560 unsigned long p); 561 /* make unix special files (block, char, fifo, socket) */ 562 int (*make_node)(unsigned int xid, 563 struct inode *inode, 564 struct dentry *dentry, 565 struct cifs_tcon *tcon, 566 const char *full_path, 567 umode_t mode, 568 dev_t device_number); 569 /* version specific fiemap implementation */ 570 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 571 struct fiemap_extent_info *, u64, u64); 572 /* version specific llseek implementation */ 573 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 574 /* Check for STATUS_IO_TIMEOUT */ 575 bool (*is_status_io_timeout)(char *buf); 576 /* Check for STATUS_NETWORK_NAME_DELETED */ 577 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 578 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 579 struct kvec *rsp_iov, 580 struct cifs_open_info_data *data); 581 int (*create_reparse_symlink)(const unsigned int xid, 582 struct inode *inode, 583 struct dentry *dentry, 584 struct cifs_tcon *tcon, 585 const char *full_path, 586 const char *symname); 587 }; 588 589 struct smb_version_values { 590 char *version_string; 591 __u16 protocol_id; 592 __u32 req_capabilities; 593 __u32 large_lock_type; 594 __u32 exclusive_lock_type; 595 __u32 shared_lock_type; 596 __u32 unlock_lock_type; 597 size_t header_preamble_size; 598 size_t header_size; 599 size_t max_header_size; 600 size_t read_rsp_size; 601 __le16 lock_cmd; 602 unsigned int cap_unix; 603 unsigned int cap_nt_find; 604 unsigned int cap_large_files; 605 __u16 signing_enabled; 606 __u16 signing_required; 607 size_t create_lease_size; 608 }; 609 610 #define HEADER_SIZE(server) (server->vals->header_size) 611 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 612 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 613 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 614 615 /** 616 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 617 * trying to reuse existing superblock for a new mount 618 */ 619 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 620 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 621 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 622 CIFS_MOUNT_MAP_SFM_CHR | \ 623 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 624 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 625 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 626 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 627 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 628 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 629 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 630 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 631 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 632 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 633 634 /** 635 * Generic VFS superblock mount flags (s_flags) to consider when 636 * trying to reuse existing superblock for a new mount 637 */ 638 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 639 SB_NODEV | SB_SYNCHRONOUS) 640 641 struct cifs_mnt_data { 642 struct cifs_sb_info *cifs_sb; 643 struct smb3_fs_context *ctx; 644 int flags; 645 }; 646 647 static inline unsigned int 648 get_rfc1002_length(void *buf) 649 { 650 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 651 } 652 653 static inline void 654 inc_rfc1001_len(void *buf, int count) 655 { 656 be32_add_cpu((__be32 *)buf, count); 657 } 658 659 struct TCP_Server_Info { 660 struct list_head tcp_ses_list; 661 struct list_head smb_ses_list; 662 spinlock_t srv_lock; /* protect anything here that is not protected */ 663 __u64 conn_id; /* connection identifier (useful for debugging) */ 664 int srv_count; /* reference counter */ 665 /* 15 character server name + 0x20 16th byte indicating type = srv */ 666 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 667 struct smb_version_operations *ops; 668 struct smb_version_values *vals; 669 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 670 enum statusEnum tcpStatus; /* what we think the status is */ 671 char *hostname; /* hostname portion of UNC string */ 672 struct socket *ssocket; 673 struct sockaddr_storage dstaddr; 674 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 675 #ifdef CONFIG_NET_NS 676 struct net *net; 677 #endif 678 wait_queue_head_t response_q; 679 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 680 spinlock_t mid_lock; /* protect mid queue and it's entries */ 681 struct list_head pending_mid_q; 682 bool noblocksnd; /* use blocking sendmsg */ 683 bool noautotune; /* do not autotune send buf sizes */ 684 bool nosharesock; 685 bool tcp_nodelay; 686 bool terminate; 687 unsigned int credits; /* send no more requests at once */ 688 unsigned int max_credits; /* can override large 32000 default at mnt */ 689 unsigned int in_flight; /* number of requests on the wire to server */ 690 unsigned int max_in_flight; /* max number of requests that were on wire */ 691 spinlock_t req_lock; /* protect the two values above */ 692 struct mutex _srv_mutex; 693 unsigned int nofs_flag; 694 struct task_struct *tsk; 695 char server_GUID[16]; 696 __u16 sec_mode; 697 bool sign; /* is signing enabled on this connection? */ 698 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 699 bool session_estab; /* mark when very first sess is established */ 700 int echo_credits; /* echo reserved slots */ 701 int oplock_credits; /* oplock break reserved slots */ 702 bool echoes:1; /* enable echoes */ 703 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 704 u16 dialect; /* dialect index that server chose */ 705 bool oplocks:1; /* enable oplocks */ 706 unsigned int maxReq; /* Clients should submit no more */ 707 /* than maxReq distinct unanswered SMBs to the server when using */ 708 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 709 unsigned int maxBuf; /* maxBuf specifies the maximum */ 710 /* message size the server can send or receive for non-raw SMBs */ 711 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 712 /* when socket is setup (and during reconnect) before NegProt sent */ 713 unsigned int max_rw; /* maxRw specifies the maximum */ 714 /* message size the server can send or receive for */ 715 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 716 unsigned int capabilities; /* selective disabling of caps by smb sess */ 717 int timeAdj; /* Adjust for difference in server time zone in sec */ 718 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 719 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 720 /* 16th byte of RFC1001 workstation name is always null */ 721 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 722 __u32 sequence_number; /* for signing, protected by srv_mutex */ 723 __u32 reconnect_instance; /* incremented on each reconnect */ 724 struct session_key session_key; 725 unsigned long lstrp; /* when we got last response from this server */ 726 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 727 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 728 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 729 char negflavor; /* NEGOTIATE response flavor */ 730 /* extended security flavors that server supports */ 731 bool sec_ntlmssp; /* supports NTLMSSP */ 732 bool sec_kerberosu2u; /* supports U2U Kerberos */ 733 bool sec_kerberos; /* supports plain Kerberos */ 734 bool sec_mskerberos; /* supports legacy MS Kerberos */ 735 bool large_buf; /* is current buffer large? */ 736 /* use SMBD connection instead of socket */ 737 bool rdma; 738 /* point to the SMBD connection if RDMA is used instead of socket */ 739 struct smbd_connection *smbd_conn; 740 struct delayed_work echo; /* echo ping workqueue job */ 741 char *smallbuf; /* pointer to current "small" buffer */ 742 char *bigbuf; /* pointer to current "big" buffer */ 743 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 744 unsigned int pdu_size; 745 unsigned int total_read; /* total amount of data read in this pass */ 746 atomic_t in_send; /* requests trying to send */ 747 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 748 #ifdef CONFIG_CIFS_STATS2 749 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 750 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 751 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 752 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 753 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 754 #endif /* STATS2 */ 755 unsigned int max_read; 756 unsigned int max_write; 757 unsigned int min_offload; 758 unsigned int retrans; 759 __le16 compress_algorithm; 760 __u16 signing_algorithm; 761 __le16 cipher_type; 762 /* save initital negprot hash */ 763 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 764 bool signing_negotiated; /* true if valid signing context rcvd from server */ 765 bool posix_ext_supported; 766 struct delayed_work reconnect; /* reconnect workqueue job */ 767 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 768 unsigned long echo_interval; 769 770 /* 771 * Number of targets available for reconnect. The more targets 772 * the more tasks have to wait to let the demultiplex thread 773 * reconnect. 774 */ 775 int nr_targets; 776 bool noblockcnt; /* use non-blocking connect() */ 777 778 /* 779 * If this is a session channel, 780 * primary_server holds the ref-counted 781 * pointer to primary channel connection for the session. 782 */ 783 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 784 struct TCP_Server_Info *primary_server; 785 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 786 787 #ifdef CONFIG_CIFS_SWN_UPCALL 788 bool use_swn_dstaddr; 789 struct sockaddr_storage swn_dstaddr; 790 #endif 791 struct mutex refpath_lock; /* protects leaf_fullpath */ 792 /* 793 * leaf_fullpath: Canonical DFS referral path related to this 794 * connection. 795 * It is used in DFS cache refresher, reconnect and may 796 * change due to nested DFS links. 797 * 798 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 799 * mostly used for not requiring a copy of @leaf_fullpath when getting 800 * cached or new DFS referrals (which might also sleep during I/O). 801 * While @srv_lock is held for making string and NULL comparions against 802 * both fields as in mount(2) and cache refresh. 803 * 804 * format: \\HOST\SHARE[\OPTIONAL PATH] 805 */ 806 char *leaf_fullpath; 807 }; 808 809 static inline bool is_smb1(struct TCP_Server_Info *server) 810 { 811 return HEADER_PREAMBLE_SIZE(server) != 0; 812 } 813 814 static inline void cifs_server_lock(struct TCP_Server_Info *server) 815 { 816 unsigned int nofs_flag = memalloc_nofs_save(); 817 818 mutex_lock(&server->_srv_mutex); 819 server->nofs_flag = nofs_flag; 820 } 821 822 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 823 { 824 unsigned int nofs_flag = server->nofs_flag; 825 826 mutex_unlock(&server->_srv_mutex); 827 memalloc_nofs_restore(nofs_flag); 828 } 829 830 struct cifs_credits { 831 unsigned int value; 832 unsigned int instance; 833 }; 834 835 static inline unsigned int 836 in_flight(struct TCP_Server_Info *server) 837 { 838 unsigned int num; 839 840 spin_lock(&server->req_lock); 841 num = server->in_flight; 842 spin_unlock(&server->req_lock); 843 return num; 844 } 845 846 static inline bool 847 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 848 { 849 int num; 850 851 spin_lock(&server->req_lock); 852 num = *credits; 853 spin_unlock(&server->req_lock); 854 return num >= num_credits; 855 } 856 857 static inline void 858 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 859 const int optype) 860 { 861 server->ops->add_credits(server, credits, optype); 862 } 863 864 static inline void 865 add_credits_and_wake_if(struct TCP_Server_Info *server, 866 const struct cifs_credits *credits, const int optype) 867 { 868 if (credits->value) { 869 server->ops->add_credits(server, credits, optype); 870 wake_up(&server->request_q); 871 } 872 } 873 874 static inline void 875 set_credits(struct TCP_Server_Info *server, const int val) 876 { 877 server->ops->set_credits(server, val); 878 } 879 880 static inline int 881 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 882 const unsigned int payload_size) 883 { 884 return server->ops->adjust_credits ? 885 server->ops->adjust_credits(server, credits, payload_size) : 0; 886 } 887 888 static inline __le64 889 get_next_mid64(struct TCP_Server_Info *server) 890 { 891 return cpu_to_le64(server->ops->get_next_mid(server)); 892 } 893 894 static inline __le16 895 get_next_mid(struct TCP_Server_Info *server) 896 { 897 __u16 mid = server->ops->get_next_mid(server); 898 /* 899 * The value in the SMB header should be little endian for easy 900 * on-the-wire decoding. 901 */ 902 return cpu_to_le16(mid); 903 } 904 905 static inline void 906 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 907 { 908 if (server->ops->revert_current_mid) 909 server->ops->revert_current_mid(server, val); 910 } 911 912 static inline void 913 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 914 const struct smb2_hdr *shdr) 915 { 916 unsigned int num = le16_to_cpu(shdr->CreditCharge); 917 918 return revert_current_mid(server, num > 0 ? num : 1); 919 } 920 921 static inline __u16 922 get_mid(const struct smb_hdr *smb) 923 { 924 return le16_to_cpu(smb->Mid); 925 } 926 927 static inline bool 928 compare_mid(__u16 mid, const struct smb_hdr *smb) 929 { 930 return mid == le16_to_cpu(smb->Mid); 931 } 932 933 /* 934 * When the server supports very large reads and writes via POSIX extensions, 935 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 936 * including the RFC1001 length. 937 * 938 * Note that this might make for "interesting" allocation problems during 939 * writeback however as we have to allocate an array of pointers for the 940 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 941 * 942 * For reads, there is a similar problem as we need to allocate an array 943 * of kvecs to handle the receive, though that should only need to be done 944 * once. 945 */ 946 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 947 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 948 949 /* 950 * When the server doesn't allow large posix writes, only allow a rsize/wsize 951 * of 2^17-1 minus the size of the call header. That allows for a read or 952 * write up to the maximum size described by RFC1002. 953 */ 954 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 955 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 956 957 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 958 959 /* 960 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 961 * those values when posix extensions aren't in force. In actuality here, we 962 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 963 * to be ok with the extra byte even though Windows doesn't send writes that 964 * are that large. 965 * 966 * Citation: 967 * 968 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 969 */ 970 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 971 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 972 973 /* 974 * Macros to allow the TCP_Server_Info->net field and related code to drop out 975 * when CONFIG_NET_NS isn't set. 976 */ 977 978 #ifdef CONFIG_NET_NS 979 980 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 981 { 982 return srv->net; 983 } 984 985 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 986 { 987 srv->net = net; 988 } 989 990 #else 991 992 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 993 { 994 return &init_net; 995 } 996 997 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 998 { 999 } 1000 1001 #endif 1002 1003 struct cifs_server_iface { 1004 struct list_head iface_head; 1005 struct kref refcount; 1006 size_t speed; 1007 size_t weight_fulfilled; 1008 unsigned int num_channels; 1009 unsigned int rdma_capable : 1; 1010 unsigned int rss_capable : 1; 1011 unsigned int is_active : 1; /* unset if non existent */ 1012 struct sockaddr_storage sockaddr; 1013 }; 1014 1015 /* release iface when last ref is dropped */ 1016 static inline void 1017 release_iface(struct kref *ref) 1018 { 1019 struct cifs_server_iface *iface = container_of(ref, 1020 struct cifs_server_iface, 1021 refcount); 1022 kfree(iface); 1023 } 1024 1025 struct cifs_chan { 1026 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1027 struct TCP_Server_Info *server; 1028 struct cifs_server_iface *iface; /* interface in use */ 1029 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1030 }; 1031 1032 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1033 1034 /* 1035 * Session structure. One of these for each uid session with a particular host 1036 */ 1037 struct cifs_ses { 1038 struct list_head smb_ses_list; 1039 struct list_head rlist; /* reconnect list */ 1040 struct list_head tcon_list; 1041 struct cifs_tcon *tcon_ipc; 1042 spinlock_t ses_lock; /* protect anything here that is not protected */ 1043 struct mutex session_mutex; 1044 struct TCP_Server_Info *server; /* pointer to server info */ 1045 int ses_count; /* reference counter */ 1046 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1047 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1048 char *serverOS; /* name of operating system underlying server */ 1049 char *serverNOS; /* name of network operating system of server */ 1050 char *serverDomain; /* security realm of server */ 1051 __u64 Suid; /* remote smb uid */ 1052 kuid_t linux_uid; /* overriding owner of files on the mount */ 1053 kuid_t cred_uid; /* owner of credentials */ 1054 unsigned int capabilities; 1055 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1056 char *user_name; /* must not be null except during init of sess 1057 and after mount option parsing we fill it */ 1058 char *domainName; 1059 char *password; 1060 char *password2; /* When key rotation used, new password may be set before it expires */ 1061 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1062 struct session_key auth_key; 1063 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1064 enum securityEnum sectype; /* what security flavor was specified? */ 1065 bool sign; /* is signing required? */ 1066 bool domainAuto:1; 1067 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1068 unsigned int flags; 1069 __u16 session_flags; 1070 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1071 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1072 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1073 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1074 1075 /* 1076 * Network interfaces available on the server this session is 1077 * connected to. 1078 * 1079 * Other channels can be opened by connecting and binding this 1080 * session to interfaces from this list. 1081 * 1082 * iface_lock should be taken when accessing any of these fields 1083 */ 1084 spinlock_t iface_lock; 1085 /* ========= begin: protected by iface_lock ======== */ 1086 struct list_head iface_list; 1087 size_t iface_count; 1088 unsigned long iface_last_update; /* jiffies */ 1089 /* ========= end: protected by iface_lock ======== */ 1090 1091 spinlock_t chan_lock; 1092 /* ========= begin: protected by chan_lock ======== */ 1093 #define CIFS_MAX_CHANNELS 16 1094 #define CIFS_INVAL_CHAN_INDEX (-1) 1095 #define CIFS_ALL_CHANNELS_SET(ses) \ 1096 ((1UL << (ses)->chan_count) - 1) 1097 #define CIFS_ALL_CHANS_GOOD(ses) \ 1098 (!(ses)->chans_need_reconnect) 1099 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1100 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1101 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1102 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1103 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1104 test_bit((index), &(ses)->chans_need_reconnect) 1105 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1106 ((ses)->chans[(index)].in_reconnect) 1107 1108 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1109 size_t chan_count; 1110 size_t chan_max; 1111 atomic_t chan_seq; /* round robin state */ 1112 1113 /* 1114 * chans_need_reconnect is a bitmap indicating which of the channels 1115 * under this smb session needs to be reconnected. 1116 * If not multichannel session, only one bit will be used. 1117 * 1118 * We will ask for sess and tcon reconnection only if all the 1119 * channels are marked for needing reconnection. This will 1120 * enable the sessions on top to continue to live till any 1121 * of the channels below are active. 1122 */ 1123 unsigned long chans_need_reconnect; 1124 /* ========= end: protected by chan_lock ======== */ 1125 struct cifs_ses *dfs_root_ses; 1126 struct nls_table *local_nls; 1127 }; 1128 1129 static inline bool 1130 cap_unix(struct cifs_ses *ses) 1131 { 1132 return ses->server->vals->cap_unix & ses->capabilities; 1133 } 1134 1135 /* 1136 * common struct for holding inode info when searching for or updating an 1137 * inode with new info 1138 */ 1139 1140 #define CIFS_FATTR_JUNCTION 0x1 1141 #define CIFS_FATTR_DELETE_PENDING 0x2 1142 #define CIFS_FATTR_NEED_REVAL 0x4 1143 #define CIFS_FATTR_INO_COLLISION 0x8 1144 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1145 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1146 1147 struct cifs_fattr { 1148 u32 cf_flags; 1149 u32 cf_cifsattrs; 1150 u64 cf_uniqueid; 1151 u64 cf_eof; 1152 u64 cf_bytes; 1153 u64 cf_createtime; 1154 kuid_t cf_uid; 1155 kgid_t cf_gid; 1156 umode_t cf_mode; 1157 dev_t cf_rdev; 1158 unsigned int cf_nlink; 1159 unsigned int cf_dtype; 1160 struct timespec64 cf_atime; 1161 struct timespec64 cf_mtime; 1162 struct timespec64 cf_ctime; 1163 u32 cf_cifstag; 1164 char *cf_symlink_target; 1165 }; 1166 1167 /* 1168 * there is one of these for each connection to a resource on a particular 1169 * session 1170 */ 1171 struct cifs_tcon { 1172 struct list_head tcon_list; 1173 int tc_count; 1174 struct list_head rlist; /* reconnect list */ 1175 spinlock_t tc_lock; /* protect anything here that is not protected */ 1176 atomic_t num_local_opens; /* num of all opens including disconnected */ 1177 atomic_t num_remote_opens; /* num of all network opens on server */ 1178 struct list_head openFileList; 1179 spinlock_t open_file_lock; /* protects list above */ 1180 struct cifs_ses *ses; /* pointer to session associated with */ 1181 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1182 char *nativeFileSystem; 1183 char *password; /* for share-level security */ 1184 __u32 tid; /* The 4 byte tree id */ 1185 __u16 Flags; /* optional support bits */ 1186 enum tid_status_enum status; 1187 atomic_t num_smbs_sent; 1188 union { 1189 struct { 1190 atomic_t num_writes; 1191 atomic_t num_reads; 1192 atomic_t num_flushes; 1193 atomic_t num_oplock_brks; 1194 atomic_t num_opens; 1195 atomic_t num_closes; 1196 atomic_t num_deletes; 1197 atomic_t num_mkdirs; 1198 atomic_t num_posixopens; 1199 atomic_t num_posixmkdirs; 1200 atomic_t num_rmdirs; 1201 atomic_t num_renames; 1202 atomic_t num_t2renames; 1203 atomic_t num_ffirst; 1204 atomic_t num_fnext; 1205 atomic_t num_fclose; 1206 atomic_t num_hardlinks; 1207 atomic_t num_symlinks; 1208 atomic_t num_locks; 1209 atomic_t num_acl_get; 1210 atomic_t num_acl_set; 1211 } cifs_stats; 1212 struct { 1213 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1214 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1215 } smb2_stats; 1216 } stats; 1217 __u64 bytes_read; 1218 __u64 bytes_written; 1219 spinlock_t stat_lock; /* protects the two fields above */ 1220 time64_t stats_from_time; 1221 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1222 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1223 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1224 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1225 bool pipe:1; /* set if connection to pipe share */ 1226 bool print:1; /* set if connection to printer share */ 1227 bool retry:1; 1228 bool nocase:1; 1229 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1230 bool nodelete:1; 1231 bool seal:1; /* transport encryption for this mounted share */ 1232 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1233 for this mount even if server would support */ 1234 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1235 bool local_lease:1; /* check leases (only) on local system not remote */ 1236 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1237 bool broken_sparse_sup; /* if server or share does not support sparse */ 1238 bool need_reconnect:1; /* connection reset, tid now invalid */ 1239 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1240 bool use_resilient:1; /* use resilient instead of durable handles */ 1241 bool use_persistent:1; /* use persistent instead of durable handles */ 1242 bool no_lease:1; /* Do not request leases on files or directories */ 1243 bool use_witness:1; /* use witness protocol */ 1244 __le32 capabilities; 1245 __u32 share_flags; 1246 __u32 maximal_access; 1247 __u32 vol_serial_number; 1248 __le64 vol_create_time; 1249 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1250 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1251 __u32 ss_flags; /* sector size flags */ 1252 __u32 perf_sector_size; /* best sector size for perf */ 1253 __u32 max_chunks; 1254 __u32 max_bytes_chunk; 1255 __u32 max_bytes_copy; 1256 __u32 max_cached_dirs; 1257 #ifdef CONFIG_CIFS_FSCACHE 1258 u64 resource_id; /* server resource id */ 1259 bool fscache_acquired; /* T if we've tried acquiring a cookie */ 1260 struct fscache_volume *fscache; /* cookie for share */ 1261 struct mutex fscache_lock; /* Prevent regetting a cookie */ 1262 #endif 1263 struct list_head pending_opens; /* list of incomplete opens */ 1264 struct cached_fids *cfids; 1265 /* BB add field for back pointer to sb struct(s)? */ 1266 #ifdef CONFIG_CIFS_DFS_UPCALL 1267 struct delayed_work dfs_cache_work; 1268 #endif 1269 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1270 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1271 }; 1272 1273 /* 1274 * This is a refcounted and timestamped container for a tcon pointer. The 1275 * container holds a tcon reference. It is considered safe to free one of 1276 * these when the tl_count goes to 0. The tl_time is the time of the last 1277 * "get" on the container. 1278 */ 1279 struct tcon_link { 1280 struct rb_node tl_rbnode; 1281 kuid_t tl_uid; 1282 unsigned long tl_flags; 1283 #define TCON_LINK_MASTER 0 1284 #define TCON_LINK_PENDING 1 1285 #define TCON_LINK_IN_TREE 2 1286 unsigned long tl_time; 1287 atomic_t tl_count; 1288 struct cifs_tcon *tl_tcon; 1289 }; 1290 1291 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1292 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1293 1294 static inline struct cifs_tcon * 1295 tlink_tcon(struct tcon_link *tlink) 1296 { 1297 return tlink->tl_tcon; 1298 } 1299 1300 static inline struct tcon_link * 1301 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1302 { 1303 return cifs_sb->master_tlink; 1304 } 1305 1306 extern void cifs_put_tlink(struct tcon_link *tlink); 1307 1308 static inline struct tcon_link * 1309 cifs_get_tlink(struct tcon_link *tlink) 1310 { 1311 if (tlink && !IS_ERR(tlink)) 1312 atomic_inc(&tlink->tl_count); 1313 return tlink; 1314 } 1315 1316 /* This function is always expected to succeed */ 1317 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1318 1319 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1320 1321 struct cifs_pending_open { 1322 struct list_head olist; 1323 struct tcon_link *tlink; 1324 __u8 lease_key[16]; 1325 __u32 oplock; 1326 }; 1327 1328 struct cifs_deferred_close { 1329 struct list_head dlist; 1330 struct tcon_link *tlink; 1331 __u16 netfid; 1332 __u64 persistent_fid; 1333 __u64 volatile_fid; 1334 }; 1335 1336 /* 1337 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1338 * This is used to track byte stream locks on the file 1339 */ 1340 struct cifsLockInfo { 1341 struct list_head llist; /* pointer to next cifsLockInfo */ 1342 struct list_head blist; /* pointer to locks blocked on this */ 1343 wait_queue_head_t block_q; 1344 __u64 offset; 1345 __u64 length; 1346 __u32 pid; 1347 __u16 type; 1348 __u16 flags; 1349 }; 1350 1351 /* 1352 * One of these for each open instance of a file 1353 */ 1354 struct cifs_search_info { 1355 loff_t index_of_last_entry; 1356 __u16 entries_in_buffer; 1357 __u16 info_level; 1358 __u32 resume_key; 1359 char *ntwrk_buf_start; 1360 char *srch_entries_start; 1361 char *last_entry; 1362 const char *presume_name; 1363 unsigned int resume_name_len; 1364 bool endOfSearch:1; 1365 bool emptyDir:1; 1366 bool unicode:1; 1367 bool smallBuf:1; /* so we know which buf_release function to call */ 1368 }; 1369 1370 #define ACL_NO_MODE ((umode_t)(-1)) 1371 struct cifs_open_parms { 1372 struct cifs_tcon *tcon; 1373 struct cifs_sb_info *cifs_sb; 1374 int disposition; 1375 int desired_access; 1376 int create_options; 1377 const char *path; 1378 struct cifs_fid *fid; 1379 umode_t mode; 1380 bool reconnect:1; 1381 bool replay:1; /* indicates that this open is for a replay */ 1382 struct kvec *ea_cctx; 1383 }; 1384 1385 struct cifs_fid { 1386 __u16 netfid; 1387 __u64 persistent_fid; /* persist file id for smb2 */ 1388 __u64 volatile_fid; /* volatile file id for smb2 */ 1389 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1390 __u8 create_guid[16]; 1391 __u32 access; 1392 struct cifs_pending_open *pending_open; 1393 unsigned int epoch; 1394 #ifdef CONFIG_CIFS_DEBUG2 1395 __u64 mid; 1396 #endif /* CIFS_DEBUG2 */ 1397 bool purge_cache; 1398 }; 1399 1400 struct cifs_fid_locks { 1401 struct list_head llist; 1402 struct cifsFileInfo *cfile; /* fid that owns locks */ 1403 struct list_head locks; /* locks held by fid above */ 1404 }; 1405 1406 struct cifsFileInfo { 1407 /* following two lists are protected by tcon->open_file_lock */ 1408 struct list_head tlist; /* pointer to next fid owned by tcon */ 1409 struct list_head flist; /* next fid (file instance) for this inode */ 1410 /* lock list below protected by cifsi->lock_sem */ 1411 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1412 kuid_t uid; /* allows finding which FileInfo structure */ 1413 __u32 pid; /* process id who opened file */ 1414 struct cifs_fid fid; /* file id from remote */ 1415 struct list_head rlist; /* reconnect list */ 1416 /* BB add lock scope info here if needed */ 1417 /* lock scope id (0 if none) */ 1418 struct dentry *dentry; 1419 struct tcon_link *tlink; 1420 unsigned int f_flags; 1421 bool invalidHandle:1; /* file closed via session abend */ 1422 bool swapfile:1; 1423 bool oplock_break_cancelled:1; 1424 bool status_file_deleted:1; /* file has been deleted */ 1425 bool offload:1; /* offload final part of _put to a wq */ 1426 unsigned int oplock_epoch; /* epoch from the lease break */ 1427 __u32 oplock_level; /* oplock/lease level from the lease break */ 1428 int count; 1429 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1430 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1431 struct cifs_search_info srch_inf; 1432 struct work_struct oplock_break; /* work for oplock breaks */ 1433 struct work_struct put; /* work for the final part of _put */ 1434 struct work_struct serverclose; /* work for serverclose */ 1435 struct delayed_work deferred; 1436 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1437 char *symlink_target; 1438 }; 1439 1440 struct cifs_io_parms { 1441 __u16 netfid; 1442 __u64 persistent_fid; /* persist file id for smb2 */ 1443 __u64 volatile_fid; /* volatile file id for smb2 */ 1444 __u32 pid; 1445 __u64 offset; 1446 unsigned int length; 1447 struct cifs_tcon *tcon; 1448 struct TCP_Server_Info *server; 1449 }; 1450 1451 struct cifs_aio_ctx { 1452 struct kref refcount; 1453 struct list_head list; 1454 struct mutex aio_mutex; 1455 struct completion done; 1456 struct iov_iter iter; 1457 struct kiocb *iocb; 1458 struct cifsFileInfo *cfile; 1459 struct bio_vec *bv; 1460 loff_t pos; 1461 unsigned int nr_pinned_pages; 1462 ssize_t rc; 1463 unsigned int len; 1464 unsigned int total_len; 1465 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1466 bool should_dirty; 1467 /* 1468 * Indicates if this aio_ctx is for direct_io, 1469 * If yes, iter is a copy of the user passed iov_iter 1470 */ 1471 bool direct_io; 1472 }; 1473 1474 /* asynchronous read support */ 1475 struct cifs_readdata { 1476 struct kref refcount; 1477 struct list_head list; 1478 struct completion done; 1479 struct cifsFileInfo *cfile; 1480 struct address_space *mapping; 1481 struct cifs_aio_ctx *ctx; 1482 __u64 offset; 1483 ssize_t got_bytes; 1484 unsigned int bytes; 1485 pid_t pid; 1486 int result; 1487 struct work_struct work; 1488 struct iov_iter iter; 1489 struct kvec iov[2]; 1490 struct TCP_Server_Info *server; 1491 #ifdef CONFIG_CIFS_SMB_DIRECT 1492 struct smbd_mr *mr; 1493 #endif 1494 struct cifs_credits credits; 1495 }; 1496 1497 /* asynchronous write support */ 1498 struct cifs_writedata { 1499 struct kref refcount; 1500 struct list_head list; 1501 struct completion done; 1502 enum writeback_sync_modes sync_mode; 1503 struct work_struct work; 1504 struct cifsFileInfo *cfile; 1505 struct cifs_aio_ctx *ctx; 1506 struct iov_iter iter; 1507 struct bio_vec *bv; 1508 __u64 offset; 1509 pid_t pid; 1510 unsigned int bytes; 1511 int result; 1512 struct TCP_Server_Info *server; 1513 #ifdef CONFIG_CIFS_SMB_DIRECT 1514 struct smbd_mr *mr; 1515 #endif 1516 struct cifs_credits credits; 1517 bool replay; 1518 }; 1519 1520 /* 1521 * Take a reference on the file private data. Must be called with 1522 * cfile->file_info_lock held. 1523 */ 1524 static inline void 1525 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1526 { 1527 ++cifs_file->count; 1528 } 1529 1530 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1531 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1532 bool offload); 1533 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1534 1535 #define CIFS_CACHE_READ_FLG 1 1536 #define CIFS_CACHE_HANDLE_FLG 2 1537 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1538 #define CIFS_CACHE_WRITE_FLG 4 1539 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1540 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1541 1542 #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)) 1543 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1544 #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)) 1545 1546 /* 1547 * One of these for each file inode 1548 */ 1549 1550 struct cifsInodeInfo { 1551 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1552 bool can_cache_brlcks; 1553 struct list_head llist; /* locks helb by this inode */ 1554 /* 1555 * NOTE: Some code paths call down_read(lock_sem) twice, so 1556 * we must always use cifs_down_write() instead of down_write() 1557 * for this semaphore to avoid deadlocks. 1558 */ 1559 struct rw_semaphore lock_sem; /* protect the fields above */ 1560 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1561 struct list_head openFileList; 1562 spinlock_t open_file_lock; /* protects openFileList */ 1563 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1564 unsigned int oplock; /* oplock/lease level we have */ 1565 unsigned int epoch; /* used to track lease state changes */ 1566 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1567 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1568 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1569 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1570 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1571 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1572 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1573 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1574 unsigned long flags; 1575 spinlock_t writers_lock; 1576 unsigned int writers; /* Number of writers on this inode */ 1577 unsigned long time; /* jiffies of last update of inode */ 1578 u64 server_eof; /* current file size on server -- protected by i_lock */ 1579 u64 uniqueid; /* server inode number */ 1580 u64 createtime; /* creation time on server */ 1581 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1582 struct list_head deferred_closes; /* list of deferred closes */ 1583 spinlock_t deferred_lock; /* protection on deferred list */ 1584 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1585 char *symlink_target; 1586 __u32 reparse_tag; 1587 }; 1588 1589 static inline struct cifsInodeInfo * 1590 CIFS_I(struct inode *inode) 1591 { 1592 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1593 } 1594 1595 static inline struct cifs_sb_info * 1596 CIFS_SB(struct super_block *sb) 1597 { 1598 return sb->s_fs_info; 1599 } 1600 1601 static inline struct cifs_sb_info * 1602 CIFS_FILE_SB(struct file *file) 1603 { 1604 return CIFS_SB(file_inode(file)->i_sb); 1605 } 1606 1607 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1608 { 1609 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1610 return '/'; 1611 else 1612 return '\\'; 1613 } 1614 1615 static inline void 1616 convert_delimiter(char *path, char delim) 1617 { 1618 char old_delim, *pos; 1619 1620 if (delim == '/') 1621 old_delim = '\\'; 1622 else 1623 old_delim = '/'; 1624 1625 pos = path; 1626 while ((pos = strchr(pos, old_delim))) 1627 *pos = delim; 1628 } 1629 1630 #define cifs_stats_inc atomic_inc 1631 1632 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1633 unsigned int bytes) 1634 { 1635 if (bytes) { 1636 spin_lock(&tcon->stat_lock); 1637 tcon->bytes_written += bytes; 1638 spin_unlock(&tcon->stat_lock); 1639 } 1640 } 1641 1642 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1643 unsigned int bytes) 1644 { 1645 spin_lock(&tcon->stat_lock); 1646 tcon->bytes_read += bytes; 1647 spin_unlock(&tcon->stat_lock); 1648 } 1649 1650 1651 /* 1652 * This is the prototype for the mid receive function. This function is for 1653 * receiving the rest of the SMB frame, starting with the WordCount (which is 1654 * just after the MID in struct smb_hdr). Note: 1655 * 1656 * - This will be called by cifsd, with no locks held. 1657 * - The mid will still be on the pending_mid_q. 1658 * - mid->resp_buf will point to the current buffer. 1659 * 1660 * Returns zero on a successful receive, or an error. The receive state in 1661 * the TCP_Server_Info will also be updated. 1662 */ 1663 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1664 struct mid_q_entry *mid); 1665 1666 /* 1667 * This is the prototype for the mid callback function. This is called once the 1668 * mid has been received off of the socket. When creating one, take special 1669 * care to avoid deadlocks. Things to bear in mind: 1670 * 1671 * - it will be called by cifsd, with no locks held 1672 * - the mid will be removed from any lists 1673 */ 1674 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1675 1676 /* 1677 * This is the protopyte for mid handle function. This is called once the mid 1678 * has been recognized after decryption of the message. 1679 */ 1680 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1681 struct mid_q_entry *mid); 1682 1683 /* one of these for every pending CIFS request to the server */ 1684 struct mid_q_entry { 1685 struct list_head qhead; /* mids waiting on reply from this server */ 1686 struct kref refcount; 1687 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1688 __u64 mid; /* multiplex id */ 1689 __u16 credits; /* number of credits consumed by this mid */ 1690 __u16 credits_received; /* number of credits from the response */ 1691 __u32 pid; /* process id */ 1692 __u32 sequence_number; /* for CIFS signing */ 1693 unsigned long when_alloc; /* when mid was created */ 1694 #ifdef CONFIG_CIFS_STATS2 1695 unsigned long when_sent; /* time when smb send finished */ 1696 unsigned long when_received; /* when demux complete (taken off wire) */ 1697 #endif 1698 mid_receive_t *receive; /* call receive callback */ 1699 mid_callback_t *callback; /* call completion callback */ 1700 mid_handle_t *handle; /* call handle mid callback */ 1701 void *callback_data; /* general purpose pointer for callback */ 1702 struct task_struct *creator; 1703 void *resp_buf; /* pointer to received SMB header */ 1704 unsigned int resp_buf_size; 1705 int mid_state; /* wish this were enum but can not pass to wait_event */ 1706 unsigned int mid_flags; 1707 __le16 command; /* smb command code */ 1708 unsigned int optype; /* operation type */ 1709 bool large_buf:1; /* if valid response, is pointer to large buf */ 1710 bool multiRsp:1; /* multiple trans2 responses for one request */ 1711 bool multiEnd:1; /* both received */ 1712 bool decrypted:1; /* decrypted entry */ 1713 }; 1714 1715 struct close_cancelled_open { 1716 struct cifs_fid fid; 1717 struct cifs_tcon *tcon; 1718 struct work_struct work; 1719 __u64 mid; 1720 __u16 cmd; 1721 }; 1722 1723 /* Make code in transport.c a little cleaner by moving 1724 update of optional stats into function below */ 1725 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1726 { 1727 atomic_inc(&server->in_send); 1728 } 1729 1730 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1731 { 1732 atomic_dec(&server->in_send); 1733 } 1734 1735 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1736 { 1737 atomic_inc(&server->num_waiters); 1738 } 1739 1740 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1741 { 1742 atomic_dec(&server->num_waiters); 1743 } 1744 1745 #ifdef CONFIG_CIFS_STATS2 1746 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1747 { 1748 mid->when_sent = jiffies; 1749 } 1750 #else 1751 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1752 { 1753 } 1754 #endif 1755 1756 /* for pending dnotify requests */ 1757 struct dir_notify_req { 1758 struct list_head lhead; 1759 __le16 Pid; 1760 __le16 PidHigh; 1761 __u16 Mid; 1762 __u16 Tid; 1763 __u16 Uid; 1764 __u16 netfid; 1765 __u32 filter; /* CompletionFilter (for multishot) */ 1766 int multishot; 1767 struct file *pfile; 1768 }; 1769 1770 struct dfs_info3_param { 1771 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1772 int path_consumed; 1773 int server_type; 1774 int ref_flag; 1775 char *path_name; 1776 char *node_name; 1777 int ttl; 1778 }; 1779 1780 struct file_list { 1781 struct list_head list; 1782 struct cifsFileInfo *cfile; 1783 }; 1784 1785 struct cifs_mount_ctx { 1786 struct cifs_sb_info *cifs_sb; 1787 struct smb3_fs_context *fs_ctx; 1788 unsigned int xid; 1789 struct TCP_Server_Info *server; 1790 struct cifs_ses *ses; 1791 struct cifs_tcon *tcon; 1792 }; 1793 1794 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1795 { 1796 kfree(param->path_name); 1797 kfree(param->node_name); 1798 } 1799 1800 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1801 { 1802 if (param) 1803 __free_dfs_info_param(param); 1804 } 1805 1806 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1807 { 1808 if (param) { 1809 __free_dfs_info_param(param); 1810 memset(param, 0, sizeof(*param)); 1811 } 1812 } 1813 1814 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1815 int number_of_items) 1816 { 1817 int i; 1818 1819 if ((number_of_items == 0) || (param == NULL)) 1820 return; 1821 for (i = 0; i < number_of_items; i++) { 1822 kfree(param[i].path_name); 1823 kfree(param[i].node_name); 1824 } 1825 kfree(param); 1826 } 1827 1828 static inline bool is_interrupt_error(int error) 1829 { 1830 switch (error) { 1831 case -EINTR: 1832 case -ERESTARTSYS: 1833 case -ERESTARTNOHAND: 1834 case -ERESTARTNOINTR: 1835 return true; 1836 } 1837 return false; 1838 } 1839 1840 static inline bool is_retryable_error(int error) 1841 { 1842 if (is_interrupt_error(error) || error == -EAGAIN) 1843 return true; 1844 return false; 1845 } 1846 1847 static inline bool is_replayable_error(int error) 1848 { 1849 if (error == -EAGAIN || error == -ECONNABORTED) 1850 return true; 1851 return false; 1852 } 1853 1854 1855 /* cifs_get_writable_file() flags */ 1856 #define FIND_WR_ANY 0 1857 #define FIND_WR_FSUID_ONLY 1 1858 #define FIND_WR_WITH_DELETE 2 1859 1860 #define MID_FREE 0 1861 #define MID_REQUEST_ALLOCATED 1 1862 #define MID_REQUEST_SUBMITTED 2 1863 #define MID_RESPONSE_RECEIVED 4 1864 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1865 #define MID_RESPONSE_MALFORMED 0x10 1866 #define MID_SHUTDOWN 0x20 1867 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1868 1869 /* Flags */ 1870 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1871 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1872 1873 /* Types of response buffer returned from SendReceive2 */ 1874 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1875 #define CIFS_SMALL_BUFFER 1 1876 #define CIFS_LARGE_BUFFER 2 1877 #define CIFS_IOVEC 4 /* array of response buffers */ 1878 1879 /* Type of Request to SendReceive2 */ 1880 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1881 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1882 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1883 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1884 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1885 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1886 1887 /* Type of request operation */ 1888 #define CIFS_ECHO_OP 0x080 /* echo request */ 1889 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1890 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1891 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1892 /* Lower bitmask values are reserved by others below. */ 1893 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1894 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1895 1896 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1897 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1898 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1899 1900 /* Security Flags: indicate type of session setup needed */ 1901 #define CIFSSEC_MAY_SIGN 0x00001 1902 #define CIFSSEC_MAY_NTLMV2 0x00004 1903 #define CIFSSEC_MAY_KRB5 0x00008 1904 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1905 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1906 1907 #define CIFSSEC_MUST_SIGN 0x01001 1908 /* note that only one of the following can be set so the 1909 result of setting MUST flags more than once will be to 1910 require use of the stronger protocol */ 1911 #define CIFSSEC_MUST_NTLMV2 0x04004 1912 #define CIFSSEC_MUST_KRB5 0x08008 1913 #ifdef CONFIG_CIFS_UPCALL 1914 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1915 #else 1916 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1917 #endif /* UPCALL */ 1918 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1919 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1920 1921 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1922 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1923 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1924 /* 1925 ***************************************************************** 1926 * All constants go here 1927 ***************************************************************** 1928 */ 1929 1930 #define UID_HASH (16) 1931 1932 /* 1933 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1934 * following to be declared. 1935 */ 1936 1937 /**************************************************************************** 1938 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1939 * to the locking order. i.e. if two locks are to be held together, the lock that 1940 * appears higher in this list needs to be taken before the other. 1941 * 1942 * If you hold a lock that is lower in this list, and you need to take a higher lock 1943 * (or if you think that one of the functions that you're calling may need to), first 1944 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1945 * ensure that locks are picked up only in one direction in the below table 1946 * (top to bottom). 1947 * 1948 * Also, if you expect a function to be called with a lock held, explicitly document 1949 * this in the comments on top of your function definition. 1950 * 1951 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1952 * possible. Blocking / calling other functions with a lock held always increase 1953 * the risk of a possible deadlock. 1954 * 1955 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1956 * debug. Also, any new lock that you introduce, please add to this list in the correct 1957 * order. 1958 * 1959 * Please populate this list whenever you introduce new locks in your changes. Or in 1960 * case I've missed some existing locks. Please ensure that it's added in the list 1961 * based on the locking order expected. 1962 * 1963 * ===================================================================================== 1964 * Lock Protects Initialization fn 1965 * ===================================================================================== 1966 * vol_list_lock 1967 * vol_info->ctx_lock vol_info->ctx 1968 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1969 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1970 * reconnect_mutex 1971 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1972 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1973 * cifs_tcon 1974 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1975 * cifs_tcon->pending_opens 1976 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1977 * cifs_tcon->bytes_written 1978 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1979 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1980 * GlobalCurrentXid 1981 * GlobalTotalActiveXid 1982 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1983 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1984 * ->CurrentMid 1985 * (any changes in mid_q_entry fields) 1986 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1987 * ->credits 1988 * ->echo_credits 1989 * ->oplock_credits 1990 * ->reconnect_instance 1991 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1992 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1993 * ->iface_count 1994 * ->iface_last_update 1995 * cifs_ses->chan_lock cifs_ses->chans 1996 * ->chans_need_reconnect 1997 * ->chans_in_reconnect 1998 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 1999 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 2000 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 2001 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 2002 * ->can_cache_brlcks 2003 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 2004 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 2005 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 2006 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 2007 * ->invalidHandle initiate_cifs_search 2008 * ->oplock_break_cancelled 2009 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 2010 ****************************************************************************/ 2011 2012 #ifdef DECLARE_GLOBALS_HERE 2013 #define GLOBAL_EXTERN 2014 #else 2015 #define GLOBAL_EXTERN extern 2016 #endif 2017 2018 /* 2019 * the list of TCP_Server_Info structures, ie each of the sockets 2020 * connecting our client to a distinct server (ip address), is 2021 * chained together by cifs_tcp_ses_list. The list of all our SMB 2022 * sessions (and from that the tree connections) can be found 2023 * by iterating over cifs_tcp_ses_list 2024 */ 2025 extern struct list_head cifs_tcp_ses_list; 2026 2027 /* 2028 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2029 * tcp session, and the list of tcon's per smb session. It also protects 2030 * the reference counters for the server, smb session, and tcon. 2031 * generally the locks should be taken in order tcp_ses_lock before 2032 * tcon->open_file_lock and that before file->file_info_lock since the 2033 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2034 */ 2035 extern spinlock_t cifs_tcp_ses_lock; 2036 2037 /* 2038 * Global transaction id (XID) information 2039 */ 2040 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2041 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2042 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2043 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2044 2045 /* 2046 * Global counters, updated atomically 2047 */ 2048 extern atomic_t sesInfoAllocCount; 2049 extern atomic_t tconInfoAllocCount; 2050 extern atomic_t tcpSesNextId; 2051 extern atomic_t tcpSesAllocCount; 2052 extern atomic_t tcpSesReconnectCount; 2053 extern atomic_t tconInfoReconnectCount; 2054 2055 /* Various Debug counters */ 2056 extern atomic_t buf_alloc_count; /* current number allocated */ 2057 extern atomic_t small_buf_alloc_count; 2058 #ifdef CONFIG_CIFS_STATS2 2059 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2060 extern atomic_t total_small_buf_alloc_count; 2061 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2062 #endif 2063 2064 /* Misc globals */ 2065 extern bool enable_oplocks; /* enable or disable oplocks */ 2066 extern bool lookupCacheEnabled; 2067 extern unsigned int global_secflags; /* if on, session setup sent 2068 with more secure ntlmssp2 challenge/resp */ 2069 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2070 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2071 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2072 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2073 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2074 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2075 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2076 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2077 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2078 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2079 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2080 extern atomic_t mid_count; 2081 2082 void cifs_oplock_break(struct work_struct *work); 2083 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2084 void smb2_deferred_work_close(struct work_struct *work); 2085 2086 extern const struct slow_work_ops cifs_oplock_break_ops; 2087 extern struct workqueue_struct *cifsiod_wq; 2088 extern struct workqueue_struct *decrypt_wq; 2089 extern struct workqueue_struct *fileinfo_put_wq; 2090 extern struct workqueue_struct *cifsoplockd_wq; 2091 extern struct workqueue_struct *deferredclose_wq; 2092 extern struct workqueue_struct *serverclose_wq; 2093 extern __u32 cifs_lock_secret; 2094 2095 extern mempool_t *cifs_mid_poolp; 2096 2097 /* Operations for different SMB versions */ 2098 #define SMB1_VERSION_STRING "1.0" 2099 #define SMB20_VERSION_STRING "2.0" 2100 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2101 extern struct smb_version_operations smb1_operations; 2102 extern struct smb_version_values smb1_values; 2103 extern struct smb_version_operations smb20_operations; 2104 extern struct smb_version_values smb20_values; 2105 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2106 #define SMB21_VERSION_STRING "2.1" 2107 extern struct smb_version_operations smb21_operations; 2108 extern struct smb_version_values smb21_values; 2109 #define SMBDEFAULT_VERSION_STRING "default" 2110 extern struct smb_version_values smbdefault_values; 2111 #define SMB3ANY_VERSION_STRING "3" 2112 extern struct smb_version_values smb3any_values; 2113 #define SMB30_VERSION_STRING "3.0" 2114 extern struct smb_version_operations smb30_operations; 2115 extern struct smb_version_values smb30_values; 2116 #define SMB302_VERSION_STRING "3.02" 2117 #define ALT_SMB302_VERSION_STRING "3.0.2" 2118 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2119 extern struct smb_version_values smb302_values; 2120 #define SMB311_VERSION_STRING "3.1.1" 2121 #define ALT_SMB311_VERSION_STRING "3.11" 2122 extern struct smb_version_operations smb311_operations; 2123 extern struct smb_version_values smb311_values; 2124 2125 static inline char *get_security_type_str(enum securityEnum sectype) 2126 { 2127 switch (sectype) { 2128 case RawNTLMSSP: 2129 return "RawNTLMSSP"; 2130 case Kerberos: 2131 return "Kerberos"; 2132 case NTLMv2: 2133 return "NTLMv2"; 2134 default: 2135 return "Unknown"; 2136 } 2137 } 2138 2139 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2140 { 2141 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2142 } 2143 2144 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2145 { 2146 /* 2147 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2148 * Subsystem Notifies That a Share Is a DFS Share. 2149 * 2150 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2151 * Application Updates a Share. 2152 */ 2153 if (!tcon || !tcon->ses || !tcon->ses->server) 2154 return false; 2155 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2156 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2157 } 2158 2159 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2160 const struct dfs_info3_param *ref) 2161 { 2162 /* 2163 * Check if all targets are capable of handling DFS referrals as per 2164 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2165 */ 2166 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2167 } 2168 2169 static inline u64 cifs_flock_len(const struct file_lock *fl) 2170 { 2171 return (u64)fl->fl_end - fl->fl_start + 1; 2172 } 2173 2174 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2175 { 2176 if (WARN_ON_ONCE(!ses || !ses->server)) 2177 return 0; 2178 /* 2179 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2180 * servers do require it during NTLMSSP. 2181 */ 2182 if (ses->server->dialect <= SMB20_PROT_ID) 2183 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2184 return sizeof(ses->workstation_name); 2185 } 2186 2187 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2188 { 2189 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2190 dst->AccessFlags = src->AccessFlags; 2191 dst->CurrentByteOffset = src->CurrentByteOffset; 2192 dst->Mode = src->Mode; 2193 dst->AlignmentRequirement = src->AlignmentRequirement; 2194 dst->FileNameLength = src->FileNameLength; 2195 } 2196 2197 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2198 int num_rqst, 2199 const u8 *sig) 2200 { 2201 unsigned int len, skip; 2202 unsigned int nents = 0; 2203 unsigned long addr; 2204 size_t data_size; 2205 int i, j; 2206 2207 /* 2208 * The first rqst has a transform header where the first 20 bytes are 2209 * not part of the encrypted blob. 2210 */ 2211 skip = 20; 2212 2213 /* Assumes the first rqst has a transform header as the first iov. 2214 * I.e. 2215 * rqst[0].rq_iov[0] is transform header 2216 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2217 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2218 */ 2219 for (i = 0; i < num_rqst; i++) { 2220 data_size = iov_iter_count(&rqst[i].rq_iter); 2221 2222 /* We really don't want a mixture of pinned and unpinned pages 2223 * in the sglist. It's hard to keep track of which is what. 2224 * Instead, we convert to a BVEC-type iterator higher up. 2225 */ 2226 if (data_size && 2227 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2228 return -EIO; 2229 2230 /* We also don't want to have any extra refs or pins to clean 2231 * up in the sglist. 2232 */ 2233 if (data_size && 2234 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2235 return -EIO; 2236 2237 for (j = 0; j < rqst[i].rq_nvec; j++) { 2238 struct kvec *iov = &rqst[i].rq_iov[j]; 2239 2240 addr = (unsigned long)iov->iov_base + skip; 2241 if (unlikely(is_vmalloc_addr((void *)addr))) { 2242 len = iov->iov_len - skip; 2243 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2244 PAGE_SIZE); 2245 } else { 2246 nents++; 2247 } 2248 skip = 0; 2249 } 2250 if (data_size) 2251 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2252 } 2253 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2254 return nents; 2255 } 2256 2257 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2258 * stack object as buf. 2259 */ 2260 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2261 const void *buf, 2262 unsigned int buflen) 2263 { 2264 unsigned long addr = (unsigned long)buf; 2265 unsigned int off = offset_in_page(addr); 2266 2267 addr &= PAGE_MASK; 2268 if (unlikely(is_vmalloc_addr((void *)addr))) { 2269 do { 2270 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2271 2272 sg_set_page(&sgtable->sgl[sgtable->nents++], 2273 vmalloc_to_page((void *)addr), len, off); 2274 2275 off = 0; 2276 addr += PAGE_SIZE; 2277 buflen -= len; 2278 } while (buflen); 2279 } else { 2280 sg_set_page(&sgtable->sgl[sgtable->nents++], 2281 virt_to_page((void *)addr), buflen, off); 2282 } 2283 } 2284 2285 #define CIFS_OPARMS(_cifs_sb, _tcon, _path, _da, _cd, _co, _mode) \ 2286 ((struct cifs_open_parms) { \ 2287 .tcon = _tcon, \ 2288 .path = _path, \ 2289 .desired_access = (_da), \ 2290 .disposition = (_cd), \ 2291 .create_options = cifs_create_options(_cifs_sb, (_co)), \ 2292 .mode = (_mode), \ 2293 .cifs_sb = _cifs_sb, \ 2294 }) 2295 2296 struct smb2_compound_vars { 2297 struct cifs_open_parms oparms; 2298 struct kvec rsp_iov[MAX_COMPOUND]; 2299 struct smb_rqst rqst[MAX_COMPOUND]; 2300 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2301 struct kvec qi_iov; 2302 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2303 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2304 struct kvec close_iov; 2305 struct smb2_file_rename_info rename_info; 2306 struct smb2_file_link_info link_info; 2307 }; 2308 2309 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2310 { 2311 bool ret; 2312 2313 spin_lock(&ses->ses_lock); 2314 ret = ses->ses_status == SES_EXITING; 2315 spin_unlock(&ses->ses_lock); 2316 return ret; 2317 } 2318 2319 #endif /* _CIFS_GLOB_H */ 2320