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 attribute cache timeout (jiffies) - 2^30 54 */ 55 #define CIFS_MAX_ACTIMEO (1 << 30) 56 57 /* 58 * Max persistent and resilient handle timeout (milliseconds). 59 * Windows durable max was 960000 (16 minutes) 60 */ 61 #define SMB3_MAX_HANDLE_TIMEOUT 960000 62 63 /* 64 * MAX_REQ is the maximum number of requests that WE will send 65 * on one socket concurrently. 66 */ 67 #define CIFS_MAX_REQ 32767 68 69 #define RFC1001_NAME_LEN 15 70 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1) 71 72 /* maximum length of ip addr as a string (including ipv6 and sctp) */ 73 #define SERVER_NAME_LENGTH 80 74 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1) 75 76 /* echo interval in seconds */ 77 #define SMB_ECHO_INTERVAL_MIN 1 78 #define SMB_ECHO_INTERVAL_MAX 600 79 #define SMB_ECHO_INTERVAL_DEFAULT 60 80 81 /* smb multichannel query server interfaces interval in seconds */ 82 #define SMB_INTERFACE_POLL_INTERVAL 600 83 84 /* maximum number of PDUs in one compound */ 85 #define MAX_COMPOUND 5 86 87 /* 88 * Default number of credits to keep available for SMB3. 89 * This value is chosen somewhat arbitrarily. The Windows client 90 * defaults to 128 credits, the Windows server allows clients up to 91 * 512 credits (or 8K for later versions), and the NetApp server 92 * does not limit clients at all. Choose a high enough default value 93 * such that the client shouldn't limit performance, but allow mount 94 * to override (until you approach 64K, where we limit credits to 65000 95 * to reduce possibility of seeing more server credit overflow bugs. 96 */ 97 #define SMB2_MAX_CREDITS_AVAILABLE 32000 98 99 #include "cifspdu.h" 100 101 #ifndef XATTR_DOS_ATTRIB 102 #define XATTR_DOS_ATTRIB "user.DOSATTRIB" 103 #endif 104 105 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */ 106 107 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses)) 108 109 /* 110 * CIFS vfs client Status information (based on what we know.) 111 */ 112 113 /* associated with each connection */ 114 enum statusEnum { 115 CifsNew = 0, 116 CifsGood, 117 CifsExiting, 118 CifsNeedReconnect, 119 CifsNeedNegotiate, 120 CifsInNegotiate, 121 }; 122 123 /* associated with each smb session */ 124 enum ses_status_enum { 125 SES_NEW = 0, 126 SES_GOOD, 127 SES_EXITING, 128 SES_NEED_RECON, 129 SES_IN_SETUP 130 }; 131 132 /* associated with each tree connection to the server */ 133 enum tid_status_enum { 134 TID_NEW = 0, 135 TID_GOOD, 136 TID_EXITING, 137 TID_NEED_RECON, 138 TID_NEED_TCON, 139 TID_IN_TCON, 140 TID_NEED_FILES_INVALIDATE, /* currently unused */ 141 TID_IN_FILES_INVALIDATE 142 }; 143 144 enum securityEnum { 145 Unspecified = 0, /* not specified */ 146 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */ 147 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */ 148 Kerberos, /* Kerberos via SPNEGO */ 149 }; 150 151 struct session_key { 152 unsigned int len; 153 char *response; 154 }; 155 156 /* crypto hashing related structure/fields, not specific to a sec mech */ 157 struct cifs_secmech { 158 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */ 159 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 160 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 161 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 162 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 163 164 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 165 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 166 }; 167 168 /* per smb session structure/fields */ 169 struct ntlmssp_auth { 170 bool sesskey_per_smbsess; /* whether session key is per smb session */ 171 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 172 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 173 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 174 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 175 }; 176 177 struct cifs_cred { 178 int uid; 179 int gid; 180 int mode; 181 int cecount; 182 struct cifs_sid osid; 183 struct cifs_sid gsid; 184 struct cifs_ntace *ntaces; 185 struct cifs_ace *aces; 186 }; 187 188 struct cifs_open_info_data { 189 bool adjust_tz; 190 union { 191 bool reparse_point; 192 bool symlink; 193 }; 194 struct { 195 /* ioctl response buffer */ 196 struct { 197 int buftype; 198 struct kvec iov; 199 } io; 200 __u32 tag; 201 union { 202 struct reparse_data_buffer *buf; 203 struct reparse_posix_data *posix; 204 }; 205 } reparse; 206 char *symlink_target; 207 struct cifs_sid posix_owner; 208 struct cifs_sid posix_group; 209 union { 210 struct smb2_file_all_info fi; 211 struct smb311_posix_qinfo posix_fi; 212 }; 213 }; 214 215 static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data) 216 { 217 struct smb2_file_all_info *fi = &data->fi; 218 u32 attrs = le32_to_cpu(fi->Attributes); 219 bool ret; 220 221 ret = data->reparse_point || (attrs & ATTR_REPARSE); 222 if (ret) 223 attrs |= ATTR_REPARSE; 224 fi->Attributes = cpu_to_le32(attrs); 225 return ret; 226 } 227 228 /* 229 ***************************************************************** 230 * Except the CIFS PDUs themselves all the 231 * globally interesting structs should go here 232 ***************************************************************** 233 */ 234 235 /* 236 * A smb_rqst represents a complete request to be issued to a server. It's 237 * formed by a kvec array, followed by an array of pages. Page data is assumed 238 * to start at the beginning of the first page. 239 */ 240 struct smb_rqst { 241 struct kvec *rq_iov; /* array of kvecs */ 242 unsigned int rq_nvec; /* number of kvecs in array */ 243 size_t rq_iter_size; /* Amount of data in ->rq_iter */ 244 struct iov_iter rq_iter; /* Data iterator */ 245 struct xarray rq_buffer; /* Page buffer for encryption */ 246 }; 247 248 struct mid_q_entry; 249 struct TCP_Server_Info; 250 struct cifsFileInfo; 251 struct cifs_ses; 252 struct cifs_tcon; 253 struct dfs_info3_param; 254 struct cifs_fattr; 255 struct smb3_fs_context; 256 struct cifs_fid; 257 struct cifs_readdata; 258 struct cifs_writedata; 259 struct cifs_io_parms; 260 struct cifs_search_info; 261 struct cifsInodeInfo; 262 struct cifs_open_parms; 263 struct cifs_credits; 264 265 struct smb_version_operations { 266 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 267 struct mid_q_entry *); 268 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 269 /* setup request: allocate mid, sign message */ 270 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 271 struct TCP_Server_Info *, 272 struct smb_rqst *); 273 /* setup async request: allocate mid, sign message */ 274 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 275 struct smb_rqst *); 276 /* check response: verify signature, map error */ 277 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 278 bool); 279 void (*add_credits)(struct TCP_Server_Info *server, 280 const struct cifs_credits *credits, 281 const int optype); 282 void (*set_credits)(struct TCP_Server_Info *, const int); 283 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 284 unsigned int (*get_credits)(struct mid_q_entry *); 285 __u64 (*get_next_mid)(struct TCP_Server_Info *); 286 void (*revert_current_mid)(struct TCP_Server_Info *server, 287 const unsigned int val); 288 /* data offset from read response message */ 289 unsigned int (*read_data_offset)(char *); 290 /* 291 * Data length from read response message 292 * When in_remaining is true, the returned data length is in 293 * message field DataRemaining for out-of-band data read (e.g through 294 * Memory Registration RDMA write in SMBD). 295 * Otherwise, the returned data length is in message field DataLength. 296 */ 297 unsigned int (*read_data_length)(char *, bool in_remaining); 298 /* map smb to linux error */ 299 int (*map_error)(char *, bool); 300 /* find mid corresponding to the response message */ 301 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 302 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 303 void (*clear_stats)(struct cifs_tcon *); 304 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 305 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 306 /* verify the message */ 307 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 308 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 309 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 310 void (*downgrade_oplock)(struct TCP_Server_Info *server, 311 struct cifsInodeInfo *cinode, __u32 oplock, 312 unsigned int epoch, bool *purge_cache); 313 /* process transaction2 response */ 314 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 315 char *, int); 316 /* check if we need to negotiate */ 317 bool (*need_neg)(struct TCP_Server_Info *); 318 /* negotiate to the server */ 319 int (*negotiate)(const unsigned int xid, 320 struct cifs_ses *ses, 321 struct TCP_Server_Info *server); 322 /* set negotiated write size */ 323 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 324 /* set negotiated read size */ 325 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 326 /* setup smb sessionn */ 327 int (*sess_setup)(const unsigned int, struct cifs_ses *, 328 struct TCP_Server_Info *server, 329 const struct nls_table *); 330 /* close smb session */ 331 int (*logoff)(const unsigned int, struct cifs_ses *); 332 /* connect to a server share */ 333 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 334 struct cifs_tcon *, const struct nls_table *); 335 /* close tree connecion */ 336 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 337 /* get DFS referrals */ 338 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 339 const char *, struct dfs_info3_param **, 340 unsigned int *, const struct nls_table *, int); 341 /* informational QFS call */ 342 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 343 struct cifs_sb_info *); 344 /* check if a path is accessible or not */ 345 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 346 struct cifs_sb_info *, const char *); 347 /* query path data from the server */ 348 int (*query_path_info)(const unsigned int xid, 349 struct cifs_tcon *tcon, 350 struct cifs_sb_info *cifs_sb, 351 const char *full_path, 352 struct cifs_open_info_data *data); 353 /* query file data from the server */ 354 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 355 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 356 /* query reparse point to determine which type of special file */ 357 int (*query_reparse_point)(const unsigned int xid, 358 struct cifs_tcon *tcon, 359 struct cifs_sb_info *cifs_sb, 360 const char *full_path, 361 u32 *tag, struct kvec *rsp, 362 int *rsp_buftype); 363 /* get server index number */ 364 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 365 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 366 struct cifs_open_info_data *data); 367 /* set size by path */ 368 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 369 const char *, __u64, struct cifs_sb_info *, bool); 370 /* set size by file handle */ 371 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 372 struct cifsFileInfo *, __u64, bool); 373 /* set attributes */ 374 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 375 const unsigned int); 376 int (*set_compression)(const unsigned int, struct cifs_tcon *, 377 struct cifsFileInfo *); 378 /* check if we can send an echo or nor */ 379 bool (*can_echo)(struct TCP_Server_Info *); 380 /* send echo request */ 381 int (*echo)(struct TCP_Server_Info *); 382 /* create directory */ 383 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 384 umode_t mode, struct cifs_tcon *tcon, 385 const char *full_path, 386 struct cifs_sb_info *cifs_sb); 387 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 388 struct cifs_tcon *tcon, const char *name, 389 struct cifs_sb_info *sb); 390 /* set info on created directory */ 391 void (*mkdir_setinfo)(struct inode *, const char *, 392 struct cifs_sb_info *, struct cifs_tcon *, 393 const unsigned int); 394 /* remove directory */ 395 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 396 struct cifs_sb_info *); 397 /* unlink file */ 398 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 399 struct cifs_sb_info *); 400 /* open, rename and delete file */ 401 int (*rename_pending_delete)(const char *, struct dentry *, 402 const unsigned int); 403 /* send rename request */ 404 int (*rename)(const unsigned int xid, 405 struct cifs_tcon *tcon, 406 struct dentry *source_dentry, 407 const char *from_name, const char *to_name, 408 struct cifs_sb_info *cifs_sb); 409 /* send create hardlink request */ 410 int (*create_hardlink)(const unsigned int xid, 411 struct cifs_tcon *tcon, 412 struct dentry *source_dentry, 413 const char *from_name, const char *to_name, 414 struct cifs_sb_info *cifs_sb); 415 /* query symlink target */ 416 int (*query_symlink)(const unsigned int xid, 417 struct cifs_tcon *tcon, 418 struct cifs_sb_info *cifs_sb, 419 const char *full_path, 420 char **target_path); 421 /* open a file for non-posix mounts */ 422 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 423 void *buf); 424 /* set fid protocol-specific info */ 425 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 426 /* close a file */ 427 void (*close)(const unsigned int, struct cifs_tcon *, 428 struct cifs_fid *); 429 /* close a file, returning file attributes and timestamps */ 430 void (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 431 struct cifsFileInfo *pfile_info); 432 /* send a flush request to the server */ 433 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 434 /* async read from the server */ 435 int (*async_readv)(struct cifs_readdata *); 436 /* async write to the server */ 437 int (*async_writev)(struct cifs_writedata *, 438 void (*release)(struct kref *)); 439 /* sync read from the server */ 440 int (*sync_read)(const unsigned int, struct cifs_fid *, 441 struct cifs_io_parms *, unsigned int *, char **, 442 int *); 443 /* sync write to the server */ 444 int (*sync_write)(const unsigned int, struct cifs_fid *, 445 struct cifs_io_parms *, unsigned int *, struct kvec *, 446 unsigned long); 447 /* open dir, start readdir */ 448 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 449 const char *, struct cifs_sb_info *, 450 struct cifs_fid *, __u16, 451 struct cifs_search_info *); 452 /* continue readdir */ 453 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 454 struct cifs_fid *, 455 __u16, struct cifs_search_info *srch_inf); 456 /* close dir */ 457 int (*close_dir)(const unsigned int, struct cifs_tcon *, 458 struct cifs_fid *); 459 /* calculate a size of SMB message */ 460 unsigned int (*calc_smb_size)(void *buf); 461 /* check for STATUS_PENDING and process the response if yes */ 462 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 463 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 464 bool (*is_session_expired)(char *); 465 /* send oplock break response */ 466 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 467 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 468 /* query remote filesystem */ 469 int (*queryfs)(const unsigned int, struct cifs_tcon *, 470 struct cifs_sb_info *, struct kstatfs *); 471 /* send mandatory brlock to the server */ 472 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 473 __u64, __u32, int, int, bool); 474 /* unlock range of mandatory locks */ 475 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 476 const unsigned int); 477 /* push brlocks from the cache to the server */ 478 int (*push_mand_locks)(struct cifsFileInfo *); 479 /* get lease key of the inode */ 480 void (*get_lease_key)(struct inode *, struct cifs_fid *); 481 /* set lease key of the inode */ 482 void (*set_lease_key)(struct inode *, struct cifs_fid *); 483 /* generate new lease key */ 484 void (*new_lease_key)(struct cifs_fid *); 485 int (*generate_signingkey)(struct cifs_ses *ses, 486 struct TCP_Server_Info *server); 487 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 488 bool allocate_crypto); 489 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 490 struct cifsFileInfo *src_file); 491 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 492 struct cifsFileInfo *src_file, void __user *); 493 int (*notify)(const unsigned int xid, struct file *pfile, 494 void __user *pbuf, bool return_changes); 495 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 496 struct cifs_sb_info *, const unsigned char *, 497 char *, unsigned int *); 498 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 499 struct cifs_sb_info *, const unsigned char *, 500 char *, unsigned int *); 501 /* if we can do cache read operations */ 502 bool (*is_read_op)(__u32); 503 /* set oplock level for the inode */ 504 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 505 bool *); 506 /* create lease context buffer for CREATE request */ 507 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 508 /* parse lease context buffer and return oplock/epoch info */ 509 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 510 ssize_t (*copychunk_range)(const unsigned int, 511 struct cifsFileInfo *src_file, 512 struct cifsFileInfo *target_file, 513 u64 src_off, u64 len, u64 dest_off); 514 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 515 struct cifsFileInfo *target_file, u64 src_off, u64 len, 516 u64 dest_off); 517 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 518 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 519 const unsigned char *, const unsigned char *, char *, 520 size_t, struct cifs_sb_info *); 521 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 522 const char *, const void *, const __u16, 523 const struct nls_table *, struct cifs_sb_info *); 524 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 525 const char *, u32 *, u32); 526 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 527 const struct cifs_fid *, u32 *, u32); 528 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 529 int); 530 /* writepages retry size */ 531 unsigned int (*wp_retry_size)(struct inode *); 532 /* get mtu credits */ 533 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 534 unsigned int *, struct cifs_credits *); 535 /* adjust previously taken mtu credits to request size */ 536 int (*adjust_credits)(struct TCP_Server_Info *server, 537 struct cifs_credits *credits, 538 const unsigned int payload_size); 539 /* check if we need to issue closedir */ 540 bool (*dir_needs_close)(struct cifsFileInfo *); 541 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 542 loff_t); 543 /* init transform request - used for encryption for now */ 544 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 545 struct smb_rqst *, struct smb_rqst *); 546 int (*is_transform_hdr)(void *buf); 547 int (*receive_transform)(struct TCP_Server_Info *, 548 struct mid_q_entry **, char **, int *); 549 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 550 enum securityEnum); 551 int (*next_header)(struct TCP_Server_Info *server, char *buf, 552 unsigned int *noff); 553 /* ioctl passthrough for query_info */ 554 int (*ioctl_query_info)(const unsigned int xid, 555 struct cifs_tcon *tcon, 556 struct cifs_sb_info *cifs_sb, 557 __le16 *path, int is_dir, 558 unsigned long p); 559 /* make unix special files (block, char, fifo, socket) */ 560 int (*make_node)(unsigned int xid, 561 struct inode *inode, 562 struct dentry *dentry, 563 struct cifs_tcon *tcon, 564 const char *full_path, 565 umode_t mode, 566 dev_t device_number); 567 /* version specific fiemap implementation */ 568 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 569 struct fiemap_extent_info *, u64, u64); 570 /* version specific llseek implementation */ 571 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 572 /* Check for STATUS_IO_TIMEOUT */ 573 bool (*is_status_io_timeout)(char *buf); 574 /* Check for STATUS_NETWORK_NAME_DELETED */ 575 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 576 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 577 struct kvec *rsp_iov, 578 struct cifs_open_info_data *data); 579 int (*create_reparse_symlink)(const unsigned int xid, 580 struct inode *inode, 581 struct dentry *dentry, 582 struct cifs_tcon *tcon, 583 const char *full_path, 584 const char *symname); 585 }; 586 587 struct smb_version_values { 588 char *version_string; 589 __u16 protocol_id; 590 __u32 req_capabilities; 591 __u32 large_lock_type; 592 __u32 exclusive_lock_type; 593 __u32 shared_lock_type; 594 __u32 unlock_lock_type; 595 size_t header_preamble_size; 596 size_t header_size; 597 size_t max_header_size; 598 size_t read_rsp_size; 599 __le16 lock_cmd; 600 unsigned int cap_unix; 601 unsigned int cap_nt_find; 602 unsigned int cap_large_files; 603 __u16 signing_enabled; 604 __u16 signing_required; 605 size_t create_lease_size; 606 }; 607 608 #define HEADER_SIZE(server) (server->vals->header_size) 609 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 610 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 611 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 612 613 /** 614 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 615 * trying to reuse existing superblock for a new mount 616 */ 617 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 618 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 619 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 620 CIFS_MOUNT_MAP_SFM_CHR | \ 621 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 622 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 623 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 624 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 625 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 626 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 627 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 628 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 629 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 630 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 631 632 /** 633 * Generic VFS superblock mount flags (s_flags) to consider when 634 * trying to reuse existing superblock for a new mount 635 */ 636 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 637 SB_NODEV | SB_SYNCHRONOUS) 638 639 struct cifs_mnt_data { 640 struct cifs_sb_info *cifs_sb; 641 struct smb3_fs_context *ctx; 642 int flags; 643 }; 644 645 static inline unsigned int 646 get_rfc1002_length(void *buf) 647 { 648 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 649 } 650 651 static inline void 652 inc_rfc1001_len(void *buf, int count) 653 { 654 be32_add_cpu((__be32 *)buf, count); 655 } 656 657 struct TCP_Server_Info { 658 struct list_head tcp_ses_list; 659 struct list_head smb_ses_list; 660 spinlock_t srv_lock; /* protect anything here that is not protected */ 661 __u64 conn_id; /* connection identifier (useful for debugging) */ 662 int srv_count; /* reference counter */ 663 /* 15 character server name + 0x20 16th byte indicating type = srv */ 664 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 665 struct smb_version_operations *ops; 666 struct smb_version_values *vals; 667 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 668 enum statusEnum tcpStatus; /* what we think the status is */ 669 char *hostname; /* hostname portion of UNC string */ 670 struct socket *ssocket; 671 struct sockaddr_storage dstaddr; 672 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 673 #ifdef CONFIG_NET_NS 674 struct net *net; 675 #endif 676 wait_queue_head_t response_q; 677 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 678 spinlock_t mid_lock; /* protect mid queue and it's entries */ 679 struct list_head pending_mid_q; 680 bool noblocksnd; /* use blocking sendmsg */ 681 bool noautotune; /* do not autotune send buf sizes */ 682 bool nosharesock; 683 bool tcp_nodelay; 684 bool terminate; 685 unsigned int credits; /* send no more requests at once */ 686 unsigned int max_credits; /* can override large 32000 default at mnt */ 687 unsigned int in_flight; /* number of requests on the wire to server */ 688 unsigned int max_in_flight; /* max number of requests that were on wire */ 689 spinlock_t req_lock; /* protect the two values above */ 690 struct mutex _srv_mutex; 691 unsigned int nofs_flag; 692 struct task_struct *tsk; 693 char server_GUID[16]; 694 __u16 sec_mode; 695 bool sign; /* is signing enabled on this connection? */ 696 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 697 bool session_estab; /* mark when very first sess is established */ 698 int echo_credits; /* echo reserved slots */ 699 int oplock_credits; /* oplock break reserved slots */ 700 bool echoes:1; /* enable echoes */ 701 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 702 u16 dialect; /* dialect index that server chose */ 703 bool oplocks:1; /* enable oplocks */ 704 unsigned int maxReq; /* Clients should submit no more */ 705 /* than maxReq distinct unanswered SMBs to the server when using */ 706 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 707 unsigned int maxBuf; /* maxBuf specifies the maximum */ 708 /* message size the server can send or receive for non-raw SMBs */ 709 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 710 /* when socket is setup (and during reconnect) before NegProt sent */ 711 unsigned int max_rw; /* maxRw specifies the maximum */ 712 /* message size the server can send or receive for */ 713 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 714 unsigned int capabilities; /* selective disabling of caps by smb sess */ 715 int timeAdj; /* Adjust for difference in server time zone in sec */ 716 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 717 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 718 /* 16th byte of RFC1001 workstation name is always null */ 719 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 720 __u32 sequence_number; /* for signing, protected by srv_mutex */ 721 __u32 reconnect_instance; /* incremented on each reconnect */ 722 struct session_key session_key; 723 unsigned long lstrp; /* when we got last response from this server */ 724 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 725 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 726 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 727 char negflavor; /* NEGOTIATE response flavor */ 728 /* extended security flavors that server supports */ 729 bool sec_ntlmssp; /* supports NTLMSSP */ 730 bool sec_kerberosu2u; /* supports U2U Kerberos */ 731 bool sec_kerberos; /* supports plain Kerberos */ 732 bool sec_mskerberos; /* supports legacy MS Kerberos */ 733 bool large_buf; /* is current buffer large? */ 734 /* use SMBD connection instead of socket */ 735 bool rdma; 736 /* point to the SMBD connection if RDMA is used instead of socket */ 737 struct smbd_connection *smbd_conn; 738 struct delayed_work echo; /* echo ping workqueue job */ 739 char *smallbuf; /* pointer to current "small" buffer */ 740 char *bigbuf; /* pointer to current "big" buffer */ 741 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 742 unsigned int pdu_size; 743 unsigned int total_read; /* total amount of data read in this pass */ 744 atomic_t in_send; /* requests trying to send */ 745 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 746 #ifdef CONFIG_CIFS_STATS2 747 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 748 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 749 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 750 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 751 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 752 #endif /* STATS2 */ 753 unsigned int max_read; 754 unsigned int max_write; 755 unsigned int min_offload; 756 unsigned int retrans; 757 __le16 compress_algorithm; 758 __u16 signing_algorithm; 759 __le16 cipher_type; 760 /* save initital negprot hash */ 761 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 762 bool signing_negotiated; /* true if valid signing context rcvd from server */ 763 bool posix_ext_supported; 764 struct delayed_work reconnect; /* reconnect workqueue job */ 765 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 766 unsigned long echo_interval; 767 768 /* 769 * Number of targets available for reconnect. The more targets 770 * the more tasks have to wait to let the demultiplex thread 771 * reconnect. 772 */ 773 int nr_targets; 774 bool noblockcnt; /* use non-blocking connect() */ 775 776 /* 777 * If this is a session channel, 778 * primary_server holds the ref-counted 779 * pointer to primary channel connection for the session. 780 */ 781 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 782 struct TCP_Server_Info *primary_server; 783 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 784 785 #ifdef CONFIG_CIFS_SWN_UPCALL 786 bool use_swn_dstaddr; 787 struct sockaddr_storage swn_dstaddr; 788 #endif 789 struct mutex refpath_lock; /* protects leaf_fullpath */ 790 /* 791 * leaf_fullpath: Canonical DFS referral path related to this 792 * connection. 793 * It is used in DFS cache refresher, reconnect and may 794 * change due to nested DFS links. 795 * 796 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 797 * mostly used for not requiring a copy of @leaf_fullpath when getting 798 * cached or new DFS referrals (which might also sleep during I/O). 799 * While @srv_lock is held for making string and NULL comparions against 800 * both fields as in mount(2) and cache refresh. 801 * 802 * format: \\HOST\SHARE[\OPTIONAL PATH] 803 */ 804 char *leaf_fullpath; 805 }; 806 807 static inline bool is_smb1(struct TCP_Server_Info *server) 808 { 809 return HEADER_PREAMBLE_SIZE(server) != 0; 810 } 811 812 static inline void cifs_server_lock(struct TCP_Server_Info *server) 813 { 814 unsigned int nofs_flag = memalloc_nofs_save(); 815 816 mutex_lock(&server->_srv_mutex); 817 server->nofs_flag = nofs_flag; 818 } 819 820 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 821 { 822 unsigned int nofs_flag = server->nofs_flag; 823 824 mutex_unlock(&server->_srv_mutex); 825 memalloc_nofs_restore(nofs_flag); 826 } 827 828 struct cifs_credits { 829 unsigned int value; 830 unsigned int instance; 831 }; 832 833 static inline unsigned int 834 in_flight(struct TCP_Server_Info *server) 835 { 836 unsigned int num; 837 838 spin_lock(&server->req_lock); 839 num = server->in_flight; 840 spin_unlock(&server->req_lock); 841 return num; 842 } 843 844 static inline bool 845 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 846 { 847 int num; 848 849 spin_lock(&server->req_lock); 850 num = *credits; 851 spin_unlock(&server->req_lock); 852 return num >= num_credits; 853 } 854 855 static inline void 856 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 857 const int optype) 858 { 859 server->ops->add_credits(server, credits, optype); 860 } 861 862 static inline void 863 add_credits_and_wake_if(struct TCP_Server_Info *server, 864 const struct cifs_credits *credits, const int optype) 865 { 866 if (credits->value) { 867 server->ops->add_credits(server, credits, optype); 868 wake_up(&server->request_q); 869 } 870 } 871 872 static inline void 873 set_credits(struct TCP_Server_Info *server, const int val) 874 { 875 server->ops->set_credits(server, val); 876 } 877 878 static inline int 879 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 880 const unsigned int payload_size) 881 { 882 return server->ops->adjust_credits ? 883 server->ops->adjust_credits(server, credits, payload_size) : 0; 884 } 885 886 static inline __le64 887 get_next_mid64(struct TCP_Server_Info *server) 888 { 889 return cpu_to_le64(server->ops->get_next_mid(server)); 890 } 891 892 static inline __le16 893 get_next_mid(struct TCP_Server_Info *server) 894 { 895 __u16 mid = server->ops->get_next_mid(server); 896 /* 897 * The value in the SMB header should be little endian for easy 898 * on-the-wire decoding. 899 */ 900 return cpu_to_le16(mid); 901 } 902 903 static inline void 904 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 905 { 906 if (server->ops->revert_current_mid) 907 server->ops->revert_current_mid(server, val); 908 } 909 910 static inline void 911 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 912 const struct smb2_hdr *shdr) 913 { 914 unsigned int num = le16_to_cpu(shdr->CreditCharge); 915 916 return revert_current_mid(server, num > 0 ? num : 1); 917 } 918 919 static inline __u16 920 get_mid(const struct smb_hdr *smb) 921 { 922 return le16_to_cpu(smb->Mid); 923 } 924 925 static inline bool 926 compare_mid(__u16 mid, const struct smb_hdr *smb) 927 { 928 return mid == le16_to_cpu(smb->Mid); 929 } 930 931 /* 932 * When the server supports very large reads and writes via POSIX extensions, 933 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 934 * including the RFC1001 length. 935 * 936 * Note that this might make for "interesting" allocation problems during 937 * writeback however as we have to allocate an array of pointers for the 938 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 939 * 940 * For reads, there is a similar problem as we need to allocate an array 941 * of kvecs to handle the receive, though that should only need to be done 942 * once. 943 */ 944 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 945 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 946 947 /* 948 * When the server doesn't allow large posix writes, only allow a rsize/wsize 949 * of 2^17-1 minus the size of the call header. That allows for a read or 950 * write up to the maximum size described by RFC1002. 951 */ 952 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 953 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 954 955 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 956 957 /* 958 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 959 * those values when posix extensions aren't in force. In actuality here, we 960 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 961 * to be ok with the extra byte even though Windows doesn't send writes that 962 * are that large. 963 * 964 * Citation: 965 * 966 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 967 */ 968 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 969 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 970 971 /* 972 * Macros to allow the TCP_Server_Info->net field and related code to drop out 973 * when CONFIG_NET_NS isn't set. 974 */ 975 976 #ifdef CONFIG_NET_NS 977 978 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 979 { 980 return srv->net; 981 } 982 983 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 984 { 985 srv->net = net; 986 } 987 988 #else 989 990 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 991 { 992 return &init_net; 993 } 994 995 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 996 { 997 } 998 999 #endif 1000 1001 struct cifs_server_iface { 1002 struct list_head iface_head; 1003 struct kref refcount; 1004 size_t speed; 1005 size_t weight_fulfilled; 1006 unsigned int num_channels; 1007 unsigned int rdma_capable : 1; 1008 unsigned int rss_capable : 1; 1009 unsigned int is_active : 1; /* unset if non existent */ 1010 struct sockaddr_storage sockaddr; 1011 }; 1012 1013 /* release iface when last ref is dropped */ 1014 static inline void 1015 release_iface(struct kref *ref) 1016 { 1017 struct cifs_server_iface *iface = container_of(ref, 1018 struct cifs_server_iface, 1019 refcount); 1020 kfree(iface); 1021 } 1022 1023 struct cifs_chan { 1024 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1025 struct TCP_Server_Info *server; 1026 struct cifs_server_iface *iface; /* interface in use */ 1027 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1028 }; 1029 1030 /* 1031 * Session structure. One of these for each uid session with a particular host 1032 */ 1033 struct cifs_ses { 1034 struct list_head smb_ses_list; 1035 struct list_head rlist; /* reconnect list */ 1036 struct list_head tcon_list; 1037 struct cifs_tcon *tcon_ipc; 1038 spinlock_t ses_lock; /* protect anything here that is not protected */ 1039 struct mutex session_mutex; 1040 struct TCP_Server_Info *server; /* pointer to server info */ 1041 int ses_count; /* reference counter */ 1042 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1043 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1044 char *serverOS; /* name of operating system underlying server */ 1045 char *serverNOS; /* name of network operating system of server */ 1046 char *serverDomain; /* security realm of server */ 1047 __u64 Suid; /* remote smb uid */ 1048 kuid_t linux_uid; /* overriding owner of files on the mount */ 1049 kuid_t cred_uid; /* owner of credentials */ 1050 unsigned int capabilities; 1051 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1052 char *user_name; /* must not be null except during init of sess 1053 and after mount option parsing we fill it */ 1054 char *domainName; 1055 char *password; 1056 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1057 struct session_key auth_key; 1058 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1059 enum securityEnum sectype; /* what security flavor was specified? */ 1060 bool sign; /* is signing required? */ 1061 bool domainAuto:1; 1062 __u16 session_flags; 1063 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1064 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1065 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1066 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1067 1068 /* 1069 * Network interfaces available on the server this session is 1070 * connected to. 1071 * 1072 * Other channels can be opened by connecting and binding this 1073 * session to interfaces from this list. 1074 * 1075 * iface_lock should be taken when accessing any of these fields 1076 */ 1077 spinlock_t iface_lock; 1078 /* ========= begin: protected by iface_lock ======== */ 1079 struct list_head iface_list; 1080 size_t iface_count; 1081 unsigned long iface_last_update; /* jiffies */ 1082 /* ========= end: protected by iface_lock ======== */ 1083 1084 spinlock_t chan_lock; 1085 /* ========= begin: protected by chan_lock ======== */ 1086 #define CIFS_MAX_CHANNELS 16 1087 #define CIFS_INVAL_CHAN_INDEX (-1) 1088 #define CIFS_ALL_CHANNELS_SET(ses) \ 1089 ((1UL << (ses)->chan_count) - 1) 1090 #define CIFS_ALL_CHANS_GOOD(ses) \ 1091 (!(ses)->chans_need_reconnect) 1092 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1093 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1094 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1095 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1096 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1097 test_bit((index), &(ses)->chans_need_reconnect) 1098 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1099 ((ses)->chans[(index)].in_reconnect) 1100 1101 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1102 size_t chan_count; 1103 size_t chan_max; 1104 atomic_t chan_seq; /* round robin state */ 1105 1106 /* 1107 * chans_need_reconnect is a bitmap indicating which of the channels 1108 * under this smb session needs to be reconnected. 1109 * If not multichannel session, only one bit will be used. 1110 * 1111 * We will ask for sess and tcon reconnection only if all the 1112 * channels are marked for needing reconnection. This will 1113 * enable the sessions on top to continue to live till any 1114 * of the channels below are active. 1115 */ 1116 unsigned long chans_need_reconnect; 1117 /* ========= end: protected by chan_lock ======== */ 1118 struct cifs_ses *dfs_root_ses; 1119 struct nls_table *local_nls; 1120 }; 1121 1122 static inline bool 1123 cap_unix(struct cifs_ses *ses) 1124 { 1125 return ses->server->vals->cap_unix & ses->capabilities; 1126 } 1127 1128 /* 1129 * common struct for holding inode info when searching for or updating an 1130 * inode with new info 1131 */ 1132 1133 #define CIFS_FATTR_JUNCTION 0x1 1134 #define CIFS_FATTR_DELETE_PENDING 0x2 1135 #define CIFS_FATTR_NEED_REVAL 0x4 1136 #define CIFS_FATTR_INO_COLLISION 0x8 1137 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1138 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1139 1140 struct cifs_fattr { 1141 u32 cf_flags; 1142 u32 cf_cifsattrs; 1143 u64 cf_uniqueid; 1144 u64 cf_eof; 1145 u64 cf_bytes; 1146 u64 cf_createtime; 1147 kuid_t cf_uid; 1148 kgid_t cf_gid; 1149 umode_t cf_mode; 1150 dev_t cf_rdev; 1151 unsigned int cf_nlink; 1152 unsigned int cf_dtype; 1153 struct timespec64 cf_atime; 1154 struct timespec64 cf_mtime; 1155 struct timespec64 cf_ctime; 1156 u32 cf_cifstag; 1157 char *cf_symlink_target; 1158 }; 1159 1160 /* 1161 * there is one of these for each connection to a resource on a particular 1162 * session 1163 */ 1164 struct cifs_tcon { 1165 struct list_head tcon_list; 1166 int tc_count; 1167 struct list_head rlist; /* reconnect list */ 1168 spinlock_t tc_lock; /* protect anything here that is not protected */ 1169 atomic_t num_local_opens; /* num of all opens including disconnected */ 1170 atomic_t num_remote_opens; /* num of all network opens on server */ 1171 struct list_head openFileList; 1172 spinlock_t open_file_lock; /* protects list above */ 1173 struct cifs_ses *ses; /* pointer to session associated with */ 1174 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1175 char *nativeFileSystem; 1176 char *password; /* for share-level security */ 1177 __u32 tid; /* The 4 byte tree id */ 1178 __u16 Flags; /* optional support bits */ 1179 enum tid_status_enum status; 1180 atomic_t num_smbs_sent; 1181 union { 1182 struct { 1183 atomic_t num_writes; 1184 atomic_t num_reads; 1185 atomic_t num_flushes; 1186 atomic_t num_oplock_brks; 1187 atomic_t num_opens; 1188 atomic_t num_closes; 1189 atomic_t num_deletes; 1190 atomic_t num_mkdirs; 1191 atomic_t num_posixopens; 1192 atomic_t num_posixmkdirs; 1193 atomic_t num_rmdirs; 1194 atomic_t num_renames; 1195 atomic_t num_t2renames; 1196 atomic_t num_ffirst; 1197 atomic_t num_fnext; 1198 atomic_t num_fclose; 1199 atomic_t num_hardlinks; 1200 atomic_t num_symlinks; 1201 atomic_t num_locks; 1202 atomic_t num_acl_get; 1203 atomic_t num_acl_set; 1204 } cifs_stats; 1205 struct { 1206 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1207 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1208 } smb2_stats; 1209 } stats; 1210 __u64 bytes_read; 1211 __u64 bytes_written; 1212 spinlock_t stat_lock; /* protects the two fields above */ 1213 time64_t stats_from_time; 1214 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1215 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1216 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1217 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1218 bool pipe:1; /* set if connection to pipe share */ 1219 bool print:1; /* set if connection to printer share */ 1220 bool retry:1; 1221 bool nocase:1; 1222 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1223 bool nodelete:1; 1224 bool seal:1; /* transport encryption for this mounted share */ 1225 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1226 for this mount even if server would support */ 1227 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1228 bool local_lease:1; /* check leases (only) on local system not remote */ 1229 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1230 bool broken_sparse_sup; /* if server or share does not support sparse */ 1231 bool need_reconnect:1; /* connection reset, tid now invalid */ 1232 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1233 bool use_resilient:1; /* use resilient instead of durable handles */ 1234 bool use_persistent:1; /* use persistent instead of durable handles */ 1235 bool no_lease:1; /* Do not request leases on files or directories */ 1236 bool use_witness:1; /* use witness protocol */ 1237 __le32 capabilities; 1238 __u32 share_flags; 1239 __u32 maximal_access; 1240 __u32 vol_serial_number; 1241 __le64 vol_create_time; 1242 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1243 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1244 __u32 ss_flags; /* sector size flags */ 1245 __u32 perf_sector_size; /* best sector size for perf */ 1246 __u32 max_chunks; 1247 __u32 max_bytes_chunk; 1248 __u32 max_bytes_copy; 1249 __u32 max_cached_dirs; 1250 #ifdef CONFIG_CIFS_FSCACHE 1251 u64 resource_id; /* server resource id */ 1252 struct fscache_volume *fscache; /* cookie for share */ 1253 #endif 1254 struct list_head pending_opens; /* list of incomplete opens */ 1255 struct cached_fids *cfids; 1256 /* BB add field for back pointer to sb struct(s)? */ 1257 #ifdef CONFIG_CIFS_DFS_UPCALL 1258 struct list_head dfs_ses_list; 1259 struct delayed_work dfs_cache_work; 1260 #endif 1261 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1262 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1263 }; 1264 1265 /* 1266 * This is a refcounted and timestamped container for a tcon pointer. The 1267 * container holds a tcon reference. It is considered safe to free one of 1268 * these when the tl_count goes to 0. The tl_time is the time of the last 1269 * "get" on the container. 1270 */ 1271 struct tcon_link { 1272 struct rb_node tl_rbnode; 1273 kuid_t tl_uid; 1274 unsigned long tl_flags; 1275 #define TCON_LINK_MASTER 0 1276 #define TCON_LINK_PENDING 1 1277 #define TCON_LINK_IN_TREE 2 1278 unsigned long tl_time; 1279 atomic_t tl_count; 1280 struct cifs_tcon *tl_tcon; 1281 }; 1282 1283 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1284 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1285 1286 static inline struct cifs_tcon * 1287 tlink_tcon(struct tcon_link *tlink) 1288 { 1289 return tlink->tl_tcon; 1290 } 1291 1292 static inline struct tcon_link * 1293 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1294 { 1295 return cifs_sb->master_tlink; 1296 } 1297 1298 extern void cifs_put_tlink(struct tcon_link *tlink); 1299 1300 static inline struct tcon_link * 1301 cifs_get_tlink(struct tcon_link *tlink) 1302 { 1303 if (tlink && !IS_ERR(tlink)) 1304 atomic_inc(&tlink->tl_count); 1305 return tlink; 1306 } 1307 1308 /* This function is always expected to succeed */ 1309 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1310 1311 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1312 1313 struct cifs_pending_open { 1314 struct list_head olist; 1315 struct tcon_link *tlink; 1316 __u8 lease_key[16]; 1317 __u32 oplock; 1318 }; 1319 1320 struct cifs_deferred_close { 1321 struct list_head dlist; 1322 struct tcon_link *tlink; 1323 __u16 netfid; 1324 __u64 persistent_fid; 1325 __u64 volatile_fid; 1326 }; 1327 1328 /* 1329 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1330 * This is used to track byte stream locks on the file 1331 */ 1332 struct cifsLockInfo { 1333 struct list_head llist; /* pointer to next cifsLockInfo */ 1334 struct list_head blist; /* pointer to locks blocked on this */ 1335 wait_queue_head_t block_q; 1336 __u64 offset; 1337 __u64 length; 1338 __u32 pid; 1339 __u16 type; 1340 __u16 flags; 1341 }; 1342 1343 /* 1344 * One of these for each open instance of a file 1345 */ 1346 struct cifs_search_info { 1347 loff_t index_of_last_entry; 1348 __u16 entries_in_buffer; 1349 __u16 info_level; 1350 __u32 resume_key; 1351 char *ntwrk_buf_start; 1352 char *srch_entries_start; 1353 char *last_entry; 1354 const char *presume_name; 1355 unsigned int resume_name_len; 1356 bool endOfSearch:1; 1357 bool emptyDir:1; 1358 bool unicode:1; 1359 bool smallBuf:1; /* so we know which buf_release function to call */ 1360 }; 1361 1362 #define ACL_NO_MODE ((umode_t)(-1)) 1363 struct cifs_open_parms { 1364 struct cifs_tcon *tcon; 1365 struct cifs_sb_info *cifs_sb; 1366 int disposition; 1367 int desired_access; 1368 int create_options; 1369 const char *path; 1370 struct cifs_fid *fid; 1371 umode_t mode; 1372 bool reconnect:1; 1373 }; 1374 1375 struct cifs_fid { 1376 __u16 netfid; 1377 __u64 persistent_fid; /* persist file id for smb2 */ 1378 __u64 volatile_fid; /* volatile file id for smb2 */ 1379 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1380 __u8 create_guid[16]; 1381 __u32 access; 1382 struct cifs_pending_open *pending_open; 1383 unsigned int epoch; 1384 #ifdef CONFIG_CIFS_DEBUG2 1385 __u64 mid; 1386 #endif /* CIFS_DEBUG2 */ 1387 bool purge_cache; 1388 }; 1389 1390 struct cifs_fid_locks { 1391 struct list_head llist; 1392 struct cifsFileInfo *cfile; /* fid that owns locks */ 1393 struct list_head locks; /* locks held by fid above */ 1394 }; 1395 1396 struct cifsFileInfo { 1397 /* following two lists are protected by tcon->open_file_lock */ 1398 struct list_head tlist; /* pointer to next fid owned by tcon */ 1399 struct list_head flist; /* next fid (file instance) for this inode */ 1400 /* lock list below protected by cifsi->lock_sem */ 1401 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1402 kuid_t uid; /* allows finding which FileInfo structure */ 1403 __u32 pid; /* process id who opened file */ 1404 struct cifs_fid fid; /* file id from remote */ 1405 struct list_head rlist; /* reconnect list */ 1406 /* BB add lock scope info here if needed */ 1407 /* lock scope id (0 if none) */ 1408 struct dentry *dentry; 1409 struct tcon_link *tlink; 1410 unsigned int f_flags; 1411 bool invalidHandle:1; /* file closed via session abend */ 1412 bool swapfile:1; 1413 bool oplock_break_cancelled:1; 1414 unsigned int oplock_epoch; /* epoch from the lease break */ 1415 __u32 oplock_level; /* oplock/lease level from the lease break */ 1416 int count; 1417 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1418 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1419 struct cifs_search_info srch_inf; 1420 struct work_struct oplock_break; /* work for oplock breaks */ 1421 struct work_struct put; /* work for the final part of _put */ 1422 struct delayed_work deferred; 1423 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1424 char *symlink_target; 1425 }; 1426 1427 struct cifs_io_parms { 1428 __u16 netfid; 1429 __u64 persistent_fid; /* persist file id for smb2 */ 1430 __u64 volatile_fid; /* volatile file id for smb2 */ 1431 __u32 pid; 1432 __u64 offset; 1433 unsigned int length; 1434 struct cifs_tcon *tcon; 1435 struct TCP_Server_Info *server; 1436 }; 1437 1438 struct cifs_aio_ctx { 1439 struct kref refcount; 1440 struct list_head list; 1441 struct mutex aio_mutex; 1442 struct completion done; 1443 struct iov_iter iter; 1444 struct kiocb *iocb; 1445 struct cifsFileInfo *cfile; 1446 struct bio_vec *bv; 1447 loff_t pos; 1448 unsigned int nr_pinned_pages; 1449 ssize_t rc; 1450 unsigned int len; 1451 unsigned int total_len; 1452 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1453 bool should_dirty; 1454 /* 1455 * Indicates if this aio_ctx is for direct_io, 1456 * If yes, iter is a copy of the user passed iov_iter 1457 */ 1458 bool direct_io; 1459 }; 1460 1461 /* asynchronous read support */ 1462 struct cifs_readdata { 1463 struct kref refcount; 1464 struct list_head list; 1465 struct completion done; 1466 struct cifsFileInfo *cfile; 1467 struct address_space *mapping; 1468 struct cifs_aio_ctx *ctx; 1469 __u64 offset; 1470 ssize_t got_bytes; 1471 unsigned int bytes; 1472 pid_t pid; 1473 int result; 1474 struct work_struct work; 1475 struct iov_iter iter; 1476 struct kvec iov[2]; 1477 struct TCP_Server_Info *server; 1478 #ifdef CONFIG_CIFS_SMB_DIRECT 1479 struct smbd_mr *mr; 1480 #endif 1481 struct cifs_credits credits; 1482 }; 1483 1484 /* asynchronous write support */ 1485 struct cifs_writedata { 1486 struct kref refcount; 1487 struct list_head list; 1488 struct completion done; 1489 enum writeback_sync_modes sync_mode; 1490 struct work_struct work; 1491 struct cifsFileInfo *cfile; 1492 struct cifs_aio_ctx *ctx; 1493 struct iov_iter iter; 1494 struct bio_vec *bv; 1495 __u64 offset; 1496 pid_t pid; 1497 unsigned int bytes; 1498 int result; 1499 struct TCP_Server_Info *server; 1500 #ifdef CONFIG_CIFS_SMB_DIRECT 1501 struct smbd_mr *mr; 1502 #endif 1503 struct cifs_credits credits; 1504 }; 1505 1506 /* 1507 * Take a reference on the file private data. Must be called with 1508 * cfile->file_info_lock held. 1509 */ 1510 static inline void 1511 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1512 { 1513 ++cifs_file->count; 1514 } 1515 1516 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1517 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1518 bool offload); 1519 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1520 1521 #define CIFS_CACHE_READ_FLG 1 1522 #define CIFS_CACHE_HANDLE_FLG 2 1523 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1524 #define CIFS_CACHE_WRITE_FLG 4 1525 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1526 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1527 1528 #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)) 1529 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1530 #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)) 1531 1532 /* 1533 * One of these for each file inode 1534 */ 1535 1536 struct cifsInodeInfo { 1537 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1538 bool can_cache_brlcks; 1539 struct list_head llist; /* locks helb by this inode */ 1540 /* 1541 * NOTE: Some code paths call down_read(lock_sem) twice, so 1542 * we must always use cifs_down_write() instead of down_write() 1543 * for this semaphore to avoid deadlocks. 1544 */ 1545 struct rw_semaphore lock_sem; /* protect the fields above */ 1546 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1547 struct list_head openFileList; 1548 spinlock_t open_file_lock; /* protects openFileList */ 1549 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1550 unsigned int oplock; /* oplock/lease level we have */ 1551 unsigned int epoch; /* used to track lease state changes */ 1552 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1553 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1554 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1555 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1556 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1557 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1558 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1559 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1560 unsigned long flags; 1561 spinlock_t writers_lock; 1562 unsigned int writers; /* Number of writers on this inode */ 1563 unsigned long time; /* jiffies of last update of inode */ 1564 u64 server_eof; /* current file size on server -- protected by i_lock */ 1565 u64 uniqueid; /* server inode number */ 1566 u64 createtime; /* creation time on server */ 1567 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1568 struct list_head deferred_closes; /* list of deferred closes */ 1569 spinlock_t deferred_lock; /* protection on deferred list */ 1570 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1571 char *symlink_target; 1572 __u32 reparse_tag; 1573 }; 1574 1575 static inline struct cifsInodeInfo * 1576 CIFS_I(struct inode *inode) 1577 { 1578 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1579 } 1580 1581 static inline struct cifs_sb_info * 1582 CIFS_SB(struct super_block *sb) 1583 { 1584 return sb->s_fs_info; 1585 } 1586 1587 static inline struct cifs_sb_info * 1588 CIFS_FILE_SB(struct file *file) 1589 { 1590 return CIFS_SB(file_inode(file)->i_sb); 1591 } 1592 1593 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1594 { 1595 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1596 return '/'; 1597 else 1598 return '\\'; 1599 } 1600 1601 static inline void 1602 convert_delimiter(char *path, char delim) 1603 { 1604 char old_delim, *pos; 1605 1606 if (delim == '/') 1607 old_delim = '\\'; 1608 else 1609 old_delim = '/'; 1610 1611 pos = path; 1612 while ((pos = strchr(pos, old_delim))) 1613 *pos = delim; 1614 } 1615 1616 #define cifs_stats_inc atomic_inc 1617 1618 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1619 unsigned int bytes) 1620 { 1621 if (bytes) { 1622 spin_lock(&tcon->stat_lock); 1623 tcon->bytes_written += bytes; 1624 spin_unlock(&tcon->stat_lock); 1625 } 1626 } 1627 1628 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1629 unsigned int bytes) 1630 { 1631 spin_lock(&tcon->stat_lock); 1632 tcon->bytes_read += bytes; 1633 spin_unlock(&tcon->stat_lock); 1634 } 1635 1636 1637 /* 1638 * This is the prototype for the mid receive function. This function is for 1639 * receiving the rest of the SMB frame, starting with the WordCount (which is 1640 * just after the MID in struct smb_hdr). Note: 1641 * 1642 * - This will be called by cifsd, with no locks held. 1643 * - The mid will still be on the pending_mid_q. 1644 * - mid->resp_buf will point to the current buffer. 1645 * 1646 * Returns zero on a successful receive, or an error. The receive state in 1647 * the TCP_Server_Info will also be updated. 1648 */ 1649 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1650 struct mid_q_entry *mid); 1651 1652 /* 1653 * This is the prototype for the mid callback function. This is called once the 1654 * mid has been received off of the socket. When creating one, take special 1655 * care to avoid deadlocks. Things to bear in mind: 1656 * 1657 * - it will be called by cifsd, with no locks held 1658 * - the mid will be removed from any lists 1659 */ 1660 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1661 1662 /* 1663 * This is the protopyte for mid handle function. This is called once the mid 1664 * has been recognized after decryption of the message. 1665 */ 1666 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1667 struct mid_q_entry *mid); 1668 1669 /* one of these for every pending CIFS request to the server */ 1670 struct mid_q_entry { 1671 struct list_head qhead; /* mids waiting on reply from this server */ 1672 struct kref refcount; 1673 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1674 __u64 mid; /* multiplex id */ 1675 __u16 credits; /* number of credits consumed by this mid */ 1676 __u16 credits_received; /* number of credits from the response */ 1677 __u32 pid; /* process id */ 1678 __u32 sequence_number; /* for CIFS signing */ 1679 unsigned long when_alloc; /* when mid was created */ 1680 #ifdef CONFIG_CIFS_STATS2 1681 unsigned long when_sent; /* time when smb send finished */ 1682 unsigned long when_received; /* when demux complete (taken off wire) */ 1683 #endif 1684 mid_receive_t *receive; /* call receive callback */ 1685 mid_callback_t *callback; /* call completion callback */ 1686 mid_handle_t *handle; /* call handle mid callback */ 1687 void *callback_data; /* general purpose pointer for callback */ 1688 struct task_struct *creator; 1689 void *resp_buf; /* pointer to received SMB header */ 1690 unsigned int resp_buf_size; 1691 int mid_state; /* wish this were enum but can not pass to wait_event */ 1692 unsigned int mid_flags; 1693 __le16 command; /* smb command code */ 1694 unsigned int optype; /* operation type */ 1695 bool large_buf:1; /* if valid response, is pointer to large buf */ 1696 bool multiRsp:1; /* multiple trans2 responses for one request */ 1697 bool multiEnd:1; /* both received */ 1698 bool decrypted:1; /* decrypted entry */ 1699 }; 1700 1701 struct close_cancelled_open { 1702 struct cifs_fid fid; 1703 struct cifs_tcon *tcon; 1704 struct work_struct work; 1705 __u64 mid; 1706 __u16 cmd; 1707 }; 1708 1709 /* Make code in transport.c a little cleaner by moving 1710 update of optional stats into function below */ 1711 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1712 { 1713 atomic_inc(&server->in_send); 1714 } 1715 1716 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1717 { 1718 atomic_dec(&server->in_send); 1719 } 1720 1721 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1722 { 1723 atomic_inc(&server->num_waiters); 1724 } 1725 1726 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1727 { 1728 atomic_dec(&server->num_waiters); 1729 } 1730 1731 #ifdef CONFIG_CIFS_STATS2 1732 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1733 { 1734 mid->when_sent = jiffies; 1735 } 1736 #else 1737 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1738 { 1739 } 1740 #endif 1741 1742 /* for pending dnotify requests */ 1743 struct dir_notify_req { 1744 struct list_head lhead; 1745 __le16 Pid; 1746 __le16 PidHigh; 1747 __u16 Mid; 1748 __u16 Tid; 1749 __u16 Uid; 1750 __u16 netfid; 1751 __u32 filter; /* CompletionFilter (for multishot) */ 1752 int multishot; 1753 struct file *pfile; 1754 }; 1755 1756 struct dfs_info3_param { 1757 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1758 int path_consumed; 1759 int server_type; 1760 int ref_flag; 1761 char *path_name; 1762 char *node_name; 1763 int ttl; 1764 }; 1765 1766 struct file_list { 1767 struct list_head list; 1768 struct cifsFileInfo *cfile; 1769 }; 1770 1771 struct cifs_mount_ctx { 1772 struct cifs_sb_info *cifs_sb; 1773 struct smb3_fs_context *fs_ctx; 1774 unsigned int xid; 1775 struct TCP_Server_Info *server; 1776 struct cifs_ses *ses; 1777 struct cifs_tcon *tcon; 1778 struct list_head dfs_ses_list; 1779 }; 1780 1781 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1782 { 1783 kfree(param->path_name); 1784 kfree(param->node_name); 1785 } 1786 1787 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1788 { 1789 if (param) 1790 __free_dfs_info_param(param); 1791 } 1792 1793 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1794 { 1795 if (param) { 1796 __free_dfs_info_param(param); 1797 memset(param, 0, sizeof(*param)); 1798 } 1799 } 1800 1801 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1802 int number_of_items) 1803 { 1804 int i; 1805 1806 if ((number_of_items == 0) || (param == NULL)) 1807 return; 1808 for (i = 0; i < number_of_items; i++) { 1809 kfree(param[i].path_name); 1810 kfree(param[i].node_name); 1811 } 1812 kfree(param); 1813 } 1814 1815 static inline bool is_interrupt_error(int error) 1816 { 1817 switch (error) { 1818 case -EINTR: 1819 case -ERESTARTSYS: 1820 case -ERESTARTNOHAND: 1821 case -ERESTARTNOINTR: 1822 return true; 1823 } 1824 return false; 1825 } 1826 1827 static inline bool is_retryable_error(int error) 1828 { 1829 if (is_interrupt_error(error) || error == -EAGAIN) 1830 return true; 1831 return false; 1832 } 1833 1834 1835 /* cifs_get_writable_file() flags */ 1836 #define FIND_WR_ANY 0 1837 #define FIND_WR_FSUID_ONLY 1 1838 #define FIND_WR_WITH_DELETE 2 1839 1840 #define MID_FREE 0 1841 #define MID_REQUEST_ALLOCATED 1 1842 #define MID_REQUEST_SUBMITTED 2 1843 #define MID_RESPONSE_RECEIVED 4 1844 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1845 #define MID_RESPONSE_MALFORMED 0x10 1846 #define MID_SHUTDOWN 0x20 1847 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1848 1849 /* Flags */ 1850 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1851 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1852 1853 /* Types of response buffer returned from SendReceive2 */ 1854 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1855 #define CIFS_SMALL_BUFFER 1 1856 #define CIFS_LARGE_BUFFER 2 1857 #define CIFS_IOVEC 4 /* array of response buffers */ 1858 1859 /* Type of Request to SendReceive2 */ 1860 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1861 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1862 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1863 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1864 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1865 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1866 1867 /* Type of request operation */ 1868 #define CIFS_ECHO_OP 0x080 /* echo request */ 1869 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1870 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1871 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1872 /* Lower bitmask values are reserved by others below. */ 1873 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1874 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1875 1876 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1877 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1878 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1879 1880 /* Security Flags: indicate type of session setup needed */ 1881 #define CIFSSEC_MAY_SIGN 0x00001 1882 #define CIFSSEC_MAY_NTLMV2 0x00004 1883 #define CIFSSEC_MAY_KRB5 0x00008 1884 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1885 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1886 1887 #define CIFSSEC_MUST_SIGN 0x01001 1888 /* note that only one of the following can be set so the 1889 result of setting MUST flags more than once will be to 1890 require use of the stronger protocol */ 1891 #define CIFSSEC_MUST_NTLMV2 0x04004 1892 #define CIFSSEC_MUST_KRB5 0x08008 1893 #ifdef CONFIG_CIFS_UPCALL 1894 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1895 #else 1896 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1897 #endif /* UPCALL */ 1898 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1899 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1900 1901 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1902 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1903 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1904 /* 1905 ***************************************************************** 1906 * All constants go here 1907 ***************************************************************** 1908 */ 1909 1910 #define UID_HASH (16) 1911 1912 /* 1913 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1914 * following to be declared. 1915 */ 1916 1917 /**************************************************************************** 1918 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1919 * to the locking order. i.e. if two locks are to be held together, the lock that 1920 * appears higher in this list needs to be taken before the other. 1921 * 1922 * If you hold a lock that is lower in this list, and you need to take a higher lock 1923 * (or if you think that one of the functions that you're calling may need to), first 1924 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1925 * ensure that locks are picked up only in one direction in the below table 1926 * (top to bottom). 1927 * 1928 * Also, if you expect a function to be called with a lock held, explicitly document 1929 * this in the comments on top of your function definition. 1930 * 1931 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1932 * possible. Blocking / calling other functions with a lock held always increase 1933 * the risk of a possible deadlock. 1934 * 1935 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1936 * debug. Also, any new lock that you introduce, please add to this list in the correct 1937 * order. 1938 * 1939 * Please populate this list whenever you introduce new locks in your changes. Or in 1940 * case I've missed some existing locks. Please ensure that it's added in the list 1941 * based on the locking order expected. 1942 * 1943 * ===================================================================================== 1944 * Lock Protects Initialization fn 1945 * ===================================================================================== 1946 * vol_list_lock 1947 * vol_info->ctx_lock vol_info->ctx 1948 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1949 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1950 * reconnect_mutex 1951 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1952 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1953 * cifs_tcon 1954 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1955 * cifs_tcon->pending_opens 1956 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1957 * cifs_tcon->bytes_written 1958 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1959 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1960 * GlobalCurrentXid 1961 * GlobalTotalActiveXid 1962 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1963 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1964 * ->CurrentMid 1965 * (any changes in mid_q_entry fields) 1966 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1967 * ->credits 1968 * ->echo_credits 1969 * ->oplock_credits 1970 * ->reconnect_instance 1971 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1972 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1973 * ->iface_count 1974 * ->iface_last_update 1975 * cifs_ses->chan_lock cifs_ses->chans 1976 * ->chans_need_reconnect 1977 * ->chans_in_reconnect 1978 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 1979 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 1980 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 1981 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 1982 * ->can_cache_brlcks 1983 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 1984 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 1985 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 1986 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 1987 * ->invalidHandle initiate_cifs_search 1988 * ->oplock_break_cancelled 1989 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 1990 ****************************************************************************/ 1991 1992 #ifdef DECLARE_GLOBALS_HERE 1993 #define GLOBAL_EXTERN 1994 #else 1995 #define GLOBAL_EXTERN extern 1996 #endif 1997 1998 /* 1999 * the list of TCP_Server_Info structures, ie each of the sockets 2000 * connecting our client to a distinct server (ip address), is 2001 * chained together by cifs_tcp_ses_list. The list of all our SMB 2002 * sessions (and from that the tree connections) can be found 2003 * by iterating over cifs_tcp_ses_list 2004 */ 2005 extern struct list_head cifs_tcp_ses_list; 2006 2007 /* 2008 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2009 * tcp session, and the list of tcon's per smb session. It also protects 2010 * the reference counters for the server, smb session, and tcon. 2011 * generally the locks should be taken in order tcp_ses_lock before 2012 * tcon->open_file_lock and that before file->file_info_lock since the 2013 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2014 */ 2015 extern spinlock_t cifs_tcp_ses_lock; 2016 2017 /* 2018 * Global transaction id (XID) information 2019 */ 2020 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2021 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2022 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2023 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2024 2025 /* 2026 * Global counters, updated atomically 2027 */ 2028 extern atomic_t sesInfoAllocCount; 2029 extern atomic_t tconInfoAllocCount; 2030 extern atomic_t tcpSesNextId; 2031 extern atomic_t tcpSesAllocCount; 2032 extern atomic_t tcpSesReconnectCount; 2033 extern atomic_t tconInfoReconnectCount; 2034 2035 /* Various Debug counters */ 2036 extern atomic_t buf_alloc_count; /* current number allocated */ 2037 extern atomic_t small_buf_alloc_count; 2038 #ifdef CONFIG_CIFS_STATS2 2039 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2040 extern atomic_t total_small_buf_alloc_count; 2041 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2042 #endif 2043 2044 /* Misc globals */ 2045 extern bool enable_oplocks; /* enable or disable oplocks */ 2046 extern bool lookupCacheEnabled; 2047 extern unsigned int global_secflags; /* if on, session setup sent 2048 with more secure ntlmssp2 challenge/resp */ 2049 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2050 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2051 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2052 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2053 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2054 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2055 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2056 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2057 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2058 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2059 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2060 extern atomic_t mid_count; 2061 2062 void cifs_oplock_break(struct work_struct *work); 2063 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2064 void smb2_deferred_work_close(struct work_struct *work); 2065 2066 extern const struct slow_work_ops cifs_oplock_break_ops; 2067 extern struct workqueue_struct *cifsiod_wq; 2068 extern struct workqueue_struct *decrypt_wq; 2069 extern struct workqueue_struct *fileinfo_put_wq; 2070 extern struct workqueue_struct *cifsoplockd_wq; 2071 extern struct workqueue_struct *deferredclose_wq; 2072 extern __u32 cifs_lock_secret; 2073 2074 extern mempool_t *cifs_mid_poolp; 2075 2076 /* Operations for different SMB versions */ 2077 #define SMB1_VERSION_STRING "1.0" 2078 #define SMB20_VERSION_STRING "2.0" 2079 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2080 extern struct smb_version_operations smb1_operations; 2081 extern struct smb_version_values smb1_values; 2082 extern struct smb_version_operations smb20_operations; 2083 extern struct smb_version_values smb20_values; 2084 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2085 #define SMB21_VERSION_STRING "2.1" 2086 extern struct smb_version_operations smb21_operations; 2087 extern struct smb_version_values smb21_values; 2088 #define SMBDEFAULT_VERSION_STRING "default" 2089 extern struct smb_version_values smbdefault_values; 2090 #define SMB3ANY_VERSION_STRING "3" 2091 extern struct smb_version_values smb3any_values; 2092 #define SMB30_VERSION_STRING "3.0" 2093 extern struct smb_version_operations smb30_operations; 2094 extern struct smb_version_values smb30_values; 2095 #define SMB302_VERSION_STRING "3.02" 2096 #define ALT_SMB302_VERSION_STRING "3.0.2" 2097 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2098 extern struct smb_version_values smb302_values; 2099 #define SMB311_VERSION_STRING "3.1.1" 2100 #define ALT_SMB311_VERSION_STRING "3.11" 2101 extern struct smb_version_operations smb311_operations; 2102 extern struct smb_version_values smb311_values; 2103 2104 static inline char *get_security_type_str(enum securityEnum sectype) 2105 { 2106 switch (sectype) { 2107 case RawNTLMSSP: 2108 return "RawNTLMSSP"; 2109 case Kerberos: 2110 return "Kerberos"; 2111 case NTLMv2: 2112 return "NTLMv2"; 2113 default: 2114 return "Unknown"; 2115 } 2116 } 2117 2118 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2119 { 2120 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2121 } 2122 2123 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2124 { 2125 /* 2126 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2127 * Subsystem Notifies That a Share Is a DFS Share. 2128 * 2129 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2130 * Application Updates a Share. 2131 */ 2132 if (!tcon || !tcon->ses || !tcon->ses->server) 2133 return false; 2134 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2135 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2136 } 2137 2138 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2139 const struct dfs_info3_param *ref) 2140 { 2141 /* 2142 * Check if all targets are capable of handling DFS referrals as per 2143 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2144 */ 2145 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2146 } 2147 2148 static inline u64 cifs_flock_len(const struct file_lock *fl) 2149 { 2150 return (u64)fl->fl_end - fl->fl_start + 1; 2151 } 2152 2153 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2154 { 2155 if (WARN_ON_ONCE(!ses || !ses->server)) 2156 return 0; 2157 /* 2158 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2159 * servers do require it during NTLMSSP. 2160 */ 2161 if (ses->server->dialect <= SMB20_PROT_ID) 2162 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2163 return sizeof(ses->workstation_name); 2164 } 2165 2166 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2167 { 2168 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2169 dst->AccessFlags = src->AccessFlags; 2170 dst->CurrentByteOffset = src->CurrentByteOffset; 2171 dst->Mode = src->Mode; 2172 dst->AlignmentRequirement = src->AlignmentRequirement; 2173 dst->FileNameLength = src->FileNameLength; 2174 } 2175 2176 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2177 int num_rqst, 2178 const u8 *sig) 2179 { 2180 unsigned int len, skip; 2181 unsigned int nents = 0; 2182 unsigned long addr; 2183 size_t data_size; 2184 int i, j; 2185 2186 /* 2187 * The first rqst has a transform header where the first 20 bytes are 2188 * not part of the encrypted blob. 2189 */ 2190 skip = 20; 2191 2192 /* Assumes the first rqst has a transform header as the first iov. 2193 * I.e. 2194 * rqst[0].rq_iov[0] is transform header 2195 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2196 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2197 */ 2198 for (i = 0; i < num_rqst; i++) { 2199 data_size = iov_iter_count(&rqst[i].rq_iter); 2200 2201 /* We really don't want a mixture of pinned and unpinned pages 2202 * in the sglist. It's hard to keep track of which is what. 2203 * Instead, we convert to a BVEC-type iterator higher up. 2204 */ 2205 if (data_size && 2206 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2207 return -EIO; 2208 2209 /* We also don't want to have any extra refs or pins to clean 2210 * up in the sglist. 2211 */ 2212 if (data_size && 2213 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2214 return -EIO; 2215 2216 for (j = 0; j < rqst[i].rq_nvec; j++) { 2217 struct kvec *iov = &rqst[i].rq_iov[j]; 2218 2219 addr = (unsigned long)iov->iov_base + skip; 2220 if (unlikely(is_vmalloc_addr((void *)addr))) { 2221 len = iov->iov_len - skip; 2222 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2223 PAGE_SIZE); 2224 } else { 2225 nents++; 2226 } 2227 skip = 0; 2228 } 2229 if (data_size) 2230 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2231 } 2232 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2233 return nents; 2234 } 2235 2236 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2237 * stack object as buf. 2238 */ 2239 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2240 const void *buf, 2241 unsigned int buflen) 2242 { 2243 unsigned long addr = (unsigned long)buf; 2244 unsigned int off = offset_in_page(addr); 2245 2246 addr &= PAGE_MASK; 2247 if (unlikely(is_vmalloc_addr((void *)addr))) { 2248 do { 2249 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2250 2251 sg_set_page(&sgtable->sgl[sgtable->nents++], 2252 vmalloc_to_page((void *)addr), len, off); 2253 2254 off = 0; 2255 addr += PAGE_SIZE; 2256 buflen -= len; 2257 } while (buflen); 2258 } else { 2259 sg_set_page(&sgtable->sgl[sgtable->nents++], 2260 virt_to_page((void *)addr), buflen, off); 2261 } 2262 } 2263 2264 struct smb2_compound_vars { 2265 struct cifs_open_parms oparms; 2266 struct kvec rsp_iov[MAX_COMPOUND]; 2267 struct smb_rqst rqst[MAX_COMPOUND]; 2268 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2269 struct kvec qi_iov; 2270 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2271 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2272 struct kvec close_iov; 2273 struct smb2_file_rename_info rename_info; 2274 struct smb2_file_link_info link_info; 2275 }; 2276 2277 #endif /* _CIFS_GLOB_H */ 2278