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 7 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 __u32 tag; 196 union { 197 struct reparse_data_buffer *buf; 198 struct reparse_posix_data *posix; 199 }; 200 } reparse; 201 char *symlink_target; 202 union { 203 struct smb2_file_all_info fi; 204 struct smb311_posix_qinfo posix_fi; 205 }; 206 }; 207 208 static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data) 209 { 210 struct smb2_file_all_info *fi = &data->fi; 211 u32 attrs = le32_to_cpu(fi->Attributes); 212 bool ret; 213 214 ret = data->reparse_point || (attrs & ATTR_REPARSE); 215 if (ret) 216 attrs |= ATTR_REPARSE; 217 fi->Attributes = cpu_to_le32(attrs); 218 return ret; 219 } 220 221 static inline void cifs_free_open_info(struct cifs_open_info_data *data) 222 { 223 kfree(data->symlink_target); 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 /* set size by file handle */ 372 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 373 struct cifsFileInfo *, __u64, bool); 374 /* set attributes */ 375 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 376 const unsigned int); 377 int (*set_compression)(const unsigned int, struct cifs_tcon *, 378 struct cifsFileInfo *); 379 /* check if we can send an echo or nor */ 380 bool (*can_echo)(struct TCP_Server_Info *); 381 /* send echo request */ 382 int (*echo)(struct TCP_Server_Info *); 383 /* create directory */ 384 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 385 umode_t mode, struct cifs_tcon *tcon, 386 const char *full_path, 387 struct cifs_sb_info *cifs_sb); 388 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 389 struct cifs_tcon *tcon, const char *name, 390 struct cifs_sb_info *sb); 391 /* set info on created directory */ 392 void (*mkdir_setinfo)(struct inode *, const char *, 393 struct cifs_sb_info *, struct cifs_tcon *, 394 const unsigned int); 395 /* remove directory */ 396 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 397 struct cifs_sb_info *); 398 /* unlink file */ 399 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 400 struct cifs_sb_info *); 401 /* open, rename and delete file */ 402 int (*rename_pending_delete)(const char *, struct dentry *, 403 const unsigned int); 404 /* send rename request */ 405 int (*rename)(const unsigned int xid, 406 struct cifs_tcon *tcon, 407 struct dentry *source_dentry, 408 const char *from_name, const char *to_name, 409 struct cifs_sb_info *cifs_sb); 410 /* send create hardlink request */ 411 int (*create_hardlink)(const unsigned int xid, 412 struct cifs_tcon *tcon, 413 struct dentry *source_dentry, 414 const char *from_name, const char *to_name, 415 struct cifs_sb_info *cifs_sb); 416 /* query symlink target */ 417 int (*query_symlink)(const unsigned int xid, 418 struct cifs_tcon *tcon, 419 struct cifs_sb_info *cifs_sb, 420 const char *full_path, 421 char **target_path); 422 /* open a file for non-posix mounts */ 423 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 424 void *buf); 425 /* set fid protocol-specific info */ 426 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 427 /* close a file */ 428 int (*close)(const unsigned int, struct cifs_tcon *, 429 struct cifs_fid *); 430 /* close a file, returning file attributes and timestamps */ 431 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 432 struct cifsFileInfo *pfile_info); 433 /* send a flush request to the server */ 434 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 435 /* async read from the server */ 436 int (*async_readv)(struct cifs_readdata *); 437 /* async write to the server */ 438 int (*async_writev)(struct cifs_writedata *, 439 void (*release)(struct kref *)); 440 /* sync read from the server */ 441 int (*sync_read)(const unsigned int, struct cifs_fid *, 442 struct cifs_io_parms *, unsigned int *, char **, 443 int *); 444 /* sync write to the server */ 445 int (*sync_write)(const unsigned int, struct cifs_fid *, 446 struct cifs_io_parms *, unsigned int *, struct kvec *, 447 unsigned long); 448 /* open dir, start readdir */ 449 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 450 const char *, struct cifs_sb_info *, 451 struct cifs_fid *, __u16, 452 struct cifs_search_info *); 453 /* continue readdir */ 454 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 455 struct cifs_fid *, 456 __u16, struct cifs_search_info *srch_inf); 457 /* close dir */ 458 int (*close_dir)(const unsigned int, struct cifs_tcon *, 459 struct cifs_fid *); 460 /* calculate a size of SMB message */ 461 unsigned int (*calc_smb_size)(void *buf); 462 /* check for STATUS_PENDING and process the response if yes */ 463 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 464 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 465 bool (*is_session_expired)(char *); 466 /* send oplock break response */ 467 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 468 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 469 /* query remote filesystem */ 470 int (*queryfs)(const unsigned int, struct cifs_tcon *, 471 struct cifs_sb_info *, struct kstatfs *); 472 /* send mandatory brlock to the server */ 473 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 474 __u64, __u32, int, int, bool); 475 /* unlock range of mandatory locks */ 476 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 477 const unsigned int); 478 /* push brlocks from the cache to the server */ 479 int (*push_mand_locks)(struct cifsFileInfo *); 480 /* get lease key of the inode */ 481 void (*get_lease_key)(struct inode *, struct cifs_fid *); 482 /* set lease key of the inode */ 483 void (*set_lease_key)(struct inode *, struct cifs_fid *); 484 /* generate new lease key */ 485 void (*new_lease_key)(struct cifs_fid *); 486 int (*generate_signingkey)(struct cifs_ses *ses, 487 struct TCP_Server_Info *server); 488 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 489 bool allocate_crypto); 490 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 491 struct cifsFileInfo *src_file); 492 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 493 struct cifsFileInfo *src_file, void __user *); 494 int (*notify)(const unsigned int xid, struct file *pfile, 495 void __user *pbuf, bool return_changes); 496 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 497 struct cifs_sb_info *, const unsigned char *, 498 char *, unsigned int *); 499 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 500 struct cifs_sb_info *, const unsigned char *, 501 char *, unsigned int *); 502 /* if we can do cache read operations */ 503 bool (*is_read_op)(__u32); 504 /* set oplock level for the inode */ 505 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 506 bool *); 507 /* create lease context buffer for CREATE request */ 508 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 509 /* parse lease context buffer and return oplock/epoch info */ 510 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 511 ssize_t (*copychunk_range)(const unsigned int, 512 struct cifsFileInfo *src_file, 513 struct cifsFileInfo *target_file, 514 u64 src_off, u64 len, u64 dest_off); 515 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 516 struct cifsFileInfo *target_file, u64 src_off, u64 len, 517 u64 dest_off); 518 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 519 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 520 const unsigned char *, const unsigned char *, char *, 521 size_t, struct cifs_sb_info *); 522 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 523 const char *, const void *, const __u16, 524 const struct nls_table *, struct cifs_sb_info *); 525 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 526 const char *, u32 *, u32); 527 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 528 const struct cifs_fid *, u32 *, u32); 529 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 530 int); 531 /* writepages retry size */ 532 unsigned int (*wp_retry_size)(struct inode *); 533 /* get mtu credits */ 534 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 535 unsigned int *, struct cifs_credits *); 536 /* adjust previously taken mtu credits to request size */ 537 int (*adjust_credits)(struct TCP_Server_Info *server, 538 struct cifs_credits *credits, 539 const unsigned int payload_size); 540 /* check if we need to issue closedir */ 541 bool (*dir_needs_close)(struct cifsFileInfo *); 542 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 543 loff_t); 544 /* init transform request - used for encryption for now */ 545 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 546 struct smb_rqst *, struct smb_rqst *); 547 int (*is_transform_hdr)(void *buf); 548 int (*receive_transform)(struct TCP_Server_Info *, 549 struct mid_q_entry **, char **, int *); 550 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 551 enum securityEnum); 552 int (*next_header)(struct TCP_Server_Info *server, char *buf, 553 unsigned int *noff); 554 /* ioctl passthrough for query_info */ 555 int (*ioctl_query_info)(const unsigned int xid, 556 struct cifs_tcon *tcon, 557 struct cifs_sb_info *cifs_sb, 558 __le16 *path, int is_dir, 559 unsigned long p); 560 /* make unix special files (block, char, fifo, socket) */ 561 int (*make_node)(unsigned int xid, 562 struct inode *inode, 563 struct dentry *dentry, 564 struct cifs_tcon *tcon, 565 const char *full_path, 566 umode_t mode, 567 dev_t device_number); 568 /* version specific fiemap implementation */ 569 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 570 struct fiemap_extent_info *, u64, u64); 571 /* version specific llseek implementation */ 572 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 573 /* Check for STATUS_IO_TIMEOUT */ 574 bool (*is_status_io_timeout)(char *buf); 575 /* Check for STATUS_NETWORK_NAME_DELETED */ 576 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 577 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 578 struct kvec *rsp_iov, 579 struct cifs_open_info_data *data); 580 }; 581 582 struct smb_version_values { 583 char *version_string; 584 __u16 protocol_id; 585 __u32 req_capabilities; 586 __u32 large_lock_type; 587 __u32 exclusive_lock_type; 588 __u32 shared_lock_type; 589 __u32 unlock_lock_type; 590 size_t header_preamble_size; 591 size_t header_size; 592 size_t max_header_size; 593 size_t read_rsp_size; 594 __le16 lock_cmd; 595 unsigned int cap_unix; 596 unsigned int cap_nt_find; 597 unsigned int cap_large_files; 598 __u16 signing_enabled; 599 __u16 signing_required; 600 size_t create_lease_size; 601 }; 602 603 #define HEADER_SIZE(server) (server->vals->header_size) 604 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 605 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 606 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 607 608 /** 609 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 610 * trying to reuse existing superblock for a new mount 611 */ 612 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 613 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 614 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 615 CIFS_MOUNT_MAP_SFM_CHR | \ 616 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 617 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 618 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 619 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 620 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 621 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 622 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 623 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 624 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 625 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 626 627 /** 628 * Generic VFS superblock mount flags (s_flags) to consider when 629 * trying to reuse existing superblock for a new mount 630 */ 631 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 632 SB_NODEV | SB_SYNCHRONOUS) 633 634 struct cifs_mnt_data { 635 struct cifs_sb_info *cifs_sb; 636 struct smb3_fs_context *ctx; 637 int flags; 638 }; 639 640 static inline unsigned int 641 get_rfc1002_length(void *buf) 642 { 643 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 644 } 645 646 static inline void 647 inc_rfc1001_len(void *buf, int count) 648 { 649 be32_add_cpu((__be32 *)buf, count); 650 } 651 652 struct TCP_Server_Info { 653 struct list_head tcp_ses_list; 654 struct list_head smb_ses_list; 655 spinlock_t srv_lock; /* protect anything here that is not protected */ 656 __u64 conn_id; /* connection identifier (useful for debugging) */ 657 int srv_count; /* reference counter */ 658 /* 15 character server name + 0x20 16th byte indicating type = srv */ 659 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 660 struct smb_version_operations *ops; 661 struct smb_version_values *vals; 662 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 663 enum statusEnum tcpStatus; /* what we think the status is */ 664 char *hostname; /* hostname portion of UNC string */ 665 struct socket *ssocket; 666 struct sockaddr_storage dstaddr; 667 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 668 #ifdef CONFIG_NET_NS 669 struct net *net; 670 #endif 671 wait_queue_head_t response_q; 672 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 673 spinlock_t mid_lock; /* protect mid queue and it's entries */ 674 struct list_head pending_mid_q; 675 bool noblocksnd; /* use blocking sendmsg */ 676 bool noautotune; /* do not autotune send buf sizes */ 677 bool nosharesock; 678 bool tcp_nodelay; 679 bool terminate; 680 unsigned int credits; /* send no more requests at once */ 681 unsigned int max_credits; /* can override large 32000 default at mnt */ 682 unsigned int in_flight; /* number of requests on the wire to server */ 683 unsigned int max_in_flight; /* max number of requests that were on wire */ 684 spinlock_t req_lock; /* protect the two values above */ 685 struct mutex _srv_mutex; 686 unsigned int nofs_flag; 687 struct task_struct *tsk; 688 char server_GUID[16]; 689 __u16 sec_mode; 690 bool sign; /* is signing enabled on this connection? */ 691 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 692 bool session_estab; /* mark when very first sess is established */ 693 int echo_credits; /* echo reserved slots */ 694 int oplock_credits; /* oplock break reserved slots */ 695 bool echoes:1; /* enable echoes */ 696 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 697 u16 dialect; /* dialect index that server chose */ 698 bool oplocks:1; /* enable oplocks */ 699 unsigned int maxReq; /* Clients should submit no more */ 700 /* than maxReq distinct unanswered SMBs to the server when using */ 701 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 702 unsigned int maxBuf; /* maxBuf specifies the maximum */ 703 /* message size the server can send or receive for non-raw SMBs */ 704 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 705 /* when socket is setup (and during reconnect) before NegProt sent */ 706 unsigned int max_rw; /* maxRw specifies the maximum */ 707 /* message size the server can send or receive for */ 708 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 709 unsigned int capabilities; /* selective disabling of caps by smb sess */ 710 int timeAdj; /* Adjust for difference in server time zone in sec */ 711 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 712 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 713 /* 16th byte of RFC1001 workstation name is always null */ 714 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 715 __u32 sequence_number; /* for signing, protected by srv_mutex */ 716 __u32 reconnect_instance; /* incremented on each reconnect */ 717 struct session_key session_key; 718 unsigned long lstrp; /* when we got last response from this server */ 719 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 720 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 721 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 722 char negflavor; /* NEGOTIATE response flavor */ 723 /* extended security flavors that server supports */ 724 bool sec_ntlmssp; /* supports NTLMSSP */ 725 bool sec_kerberosu2u; /* supports U2U Kerberos */ 726 bool sec_kerberos; /* supports plain Kerberos */ 727 bool sec_mskerberos; /* supports legacy MS Kerberos */ 728 bool large_buf; /* is current buffer large? */ 729 /* use SMBD connection instead of socket */ 730 bool rdma; 731 /* point to the SMBD connection if RDMA is used instead of socket */ 732 struct smbd_connection *smbd_conn; 733 struct delayed_work echo; /* echo ping workqueue job */ 734 char *smallbuf; /* pointer to current "small" buffer */ 735 char *bigbuf; /* pointer to current "big" buffer */ 736 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 737 unsigned int pdu_size; 738 unsigned int total_read; /* total amount of data read in this pass */ 739 atomic_t in_send; /* requests trying to send */ 740 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 741 #ifdef CONFIG_CIFS_STATS2 742 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 743 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 744 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 745 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 746 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 747 #endif /* STATS2 */ 748 unsigned int max_read; 749 unsigned int max_write; 750 unsigned int min_offload; 751 __le16 compress_algorithm; 752 __u16 signing_algorithm; 753 __le16 cipher_type; 754 /* save initital negprot hash */ 755 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 756 bool signing_negotiated; /* true if valid signing context rcvd from server */ 757 bool posix_ext_supported; 758 struct delayed_work reconnect; /* reconnect workqueue job */ 759 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 760 unsigned long echo_interval; 761 762 /* 763 * Number of targets available for reconnect. The more targets 764 * the more tasks have to wait to let the demultiplex thread 765 * reconnect. 766 */ 767 int nr_targets; 768 bool noblockcnt; /* use non-blocking connect() */ 769 770 /* 771 * If this is a session channel, 772 * primary_server holds the ref-counted 773 * pointer to primary channel connection for the session. 774 */ 775 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 776 struct TCP_Server_Info *primary_server; 777 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 778 779 #ifdef CONFIG_CIFS_SWN_UPCALL 780 bool use_swn_dstaddr; 781 struct sockaddr_storage swn_dstaddr; 782 #endif 783 struct mutex refpath_lock; /* protects leaf_fullpath */ 784 /* 785 * leaf_fullpath: Canonical DFS referral path related to this 786 * connection. 787 * It is used in DFS cache refresher, reconnect and may 788 * change due to nested DFS links. 789 * 790 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 791 * mostly used for not requiring a copy of @leaf_fullpath when getting 792 * cached or new DFS referrals (which might also sleep during I/O). 793 * While @srv_lock is held for making string and NULL comparions against 794 * both fields as in mount(2) and cache refresh. 795 * 796 * format: \\HOST\SHARE[\OPTIONAL PATH] 797 */ 798 char *leaf_fullpath; 799 }; 800 801 static inline bool is_smb1(struct TCP_Server_Info *server) 802 { 803 return HEADER_PREAMBLE_SIZE(server) != 0; 804 } 805 806 static inline void cifs_server_lock(struct TCP_Server_Info *server) 807 { 808 unsigned int nofs_flag = memalloc_nofs_save(); 809 810 mutex_lock(&server->_srv_mutex); 811 server->nofs_flag = nofs_flag; 812 } 813 814 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 815 { 816 unsigned int nofs_flag = server->nofs_flag; 817 818 mutex_unlock(&server->_srv_mutex); 819 memalloc_nofs_restore(nofs_flag); 820 } 821 822 struct cifs_credits { 823 unsigned int value; 824 unsigned int instance; 825 }; 826 827 static inline unsigned int 828 in_flight(struct TCP_Server_Info *server) 829 { 830 unsigned int num; 831 832 spin_lock(&server->req_lock); 833 num = server->in_flight; 834 spin_unlock(&server->req_lock); 835 return num; 836 } 837 838 static inline bool 839 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 840 { 841 int num; 842 843 spin_lock(&server->req_lock); 844 num = *credits; 845 spin_unlock(&server->req_lock); 846 return num >= num_credits; 847 } 848 849 static inline void 850 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 851 const int optype) 852 { 853 server->ops->add_credits(server, credits, optype); 854 } 855 856 static inline void 857 add_credits_and_wake_if(struct TCP_Server_Info *server, 858 const struct cifs_credits *credits, const int optype) 859 { 860 if (credits->value) { 861 server->ops->add_credits(server, credits, optype); 862 wake_up(&server->request_q); 863 } 864 } 865 866 static inline void 867 set_credits(struct TCP_Server_Info *server, const int val) 868 { 869 server->ops->set_credits(server, val); 870 } 871 872 static inline int 873 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 874 const unsigned int payload_size) 875 { 876 return server->ops->adjust_credits ? 877 server->ops->adjust_credits(server, credits, payload_size) : 0; 878 } 879 880 static inline __le64 881 get_next_mid64(struct TCP_Server_Info *server) 882 { 883 return cpu_to_le64(server->ops->get_next_mid(server)); 884 } 885 886 static inline __le16 887 get_next_mid(struct TCP_Server_Info *server) 888 { 889 __u16 mid = server->ops->get_next_mid(server); 890 /* 891 * The value in the SMB header should be little endian for easy 892 * on-the-wire decoding. 893 */ 894 return cpu_to_le16(mid); 895 } 896 897 static inline void 898 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 899 { 900 if (server->ops->revert_current_mid) 901 server->ops->revert_current_mid(server, val); 902 } 903 904 static inline void 905 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 906 const struct smb2_hdr *shdr) 907 { 908 unsigned int num = le16_to_cpu(shdr->CreditCharge); 909 910 return revert_current_mid(server, num > 0 ? num : 1); 911 } 912 913 static inline __u16 914 get_mid(const struct smb_hdr *smb) 915 { 916 return le16_to_cpu(smb->Mid); 917 } 918 919 static inline bool 920 compare_mid(__u16 mid, const struct smb_hdr *smb) 921 { 922 return mid == le16_to_cpu(smb->Mid); 923 } 924 925 /* 926 * When the server supports very large reads and writes via POSIX extensions, 927 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 928 * including the RFC1001 length. 929 * 930 * Note that this might make for "interesting" allocation problems during 931 * writeback however as we have to allocate an array of pointers for the 932 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 933 * 934 * For reads, there is a similar problem as we need to allocate an array 935 * of kvecs to handle the receive, though that should only need to be done 936 * once. 937 */ 938 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 939 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 940 941 /* 942 * When the server doesn't allow large posix writes, only allow a rsize/wsize 943 * of 2^17-1 minus the size of the call header. That allows for a read or 944 * write up to the maximum size described by RFC1002. 945 */ 946 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 947 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 948 949 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 950 951 /* 952 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 953 * those values when posix extensions aren't in force. In actuality here, we 954 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 955 * to be ok with the extra byte even though Windows doesn't send writes that 956 * are that large. 957 * 958 * Citation: 959 * 960 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 961 */ 962 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 963 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 964 965 /* 966 * Macros to allow the TCP_Server_Info->net field and related code to drop out 967 * when CONFIG_NET_NS isn't set. 968 */ 969 970 #ifdef CONFIG_NET_NS 971 972 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 973 { 974 return srv->net; 975 } 976 977 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 978 { 979 srv->net = net; 980 } 981 982 #else 983 984 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 985 { 986 return &init_net; 987 } 988 989 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 990 { 991 } 992 993 #endif 994 995 struct cifs_server_iface { 996 struct list_head iface_head; 997 struct kref refcount; 998 size_t speed; 999 size_t weight_fulfilled; 1000 unsigned int num_channels; 1001 unsigned int rdma_capable : 1; 1002 unsigned int rss_capable : 1; 1003 unsigned int is_active : 1; /* unset if non existent */ 1004 struct sockaddr_storage sockaddr; 1005 }; 1006 1007 /* release iface when last ref is dropped */ 1008 static inline void 1009 release_iface(struct kref *ref) 1010 { 1011 struct cifs_server_iface *iface = container_of(ref, 1012 struct cifs_server_iface, 1013 refcount); 1014 kfree(iface); 1015 } 1016 1017 struct cifs_chan { 1018 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1019 struct TCP_Server_Info *server; 1020 struct cifs_server_iface *iface; /* interface in use */ 1021 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1022 }; 1023 1024 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1025 1026 /* 1027 * Session structure. One of these for each uid session with a particular host 1028 */ 1029 struct cifs_ses { 1030 struct list_head smb_ses_list; 1031 struct list_head rlist; /* reconnect list */ 1032 struct list_head tcon_list; 1033 struct cifs_tcon *tcon_ipc; 1034 spinlock_t ses_lock; /* protect anything here that is not protected */ 1035 struct mutex session_mutex; 1036 struct TCP_Server_Info *server; /* pointer to server info */ 1037 int ses_count; /* reference counter */ 1038 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1039 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1040 char *serverOS; /* name of operating system underlying server */ 1041 char *serverNOS; /* name of network operating system of server */ 1042 char *serverDomain; /* security realm of server */ 1043 __u64 Suid; /* remote smb uid */ 1044 kuid_t linux_uid; /* overriding owner of files on the mount */ 1045 kuid_t cred_uid; /* owner of credentials */ 1046 unsigned int capabilities; 1047 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1048 char *user_name; /* must not be null except during init of sess 1049 and after mount option parsing we fill it */ 1050 char *domainName; 1051 char *password; 1052 char *password2; /* When key rotation used, new password may be set before it expires */ 1053 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1054 struct session_key auth_key; 1055 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1056 enum securityEnum sectype; /* what security flavor was specified? */ 1057 bool sign; /* is signing required? */ 1058 bool domainAuto:1; 1059 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1060 unsigned int flags; 1061 __u16 session_flags; 1062 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1063 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1064 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1065 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1066 1067 /* 1068 * Network interfaces available on the server this session is 1069 * connected to. 1070 * 1071 * Other channels can be opened by connecting and binding this 1072 * session to interfaces from this list. 1073 * 1074 * iface_lock should be taken when accessing any of these fields 1075 */ 1076 spinlock_t iface_lock; 1077 /* ========= begin: protected by iface_lock ======== */ 1078 struct list_head iface_list; 1079 size_t iface_count; 1080 unsigned long iface_last_update; /* jiffies */ 1081 /* ========= end: protected by iface_lock ======== */ 1082 1083 spinlock_t chan_lock; 1084 /* ========= begin: protected by chan_lock ======== */ 1085 #define CIFS_MAX_CHANNELS 16 1086 #define CIFS_INVAL_CHAN_INDEX (-1) 1087 #define CIFS_ALL_CHANNELS_SET(ses) \ 1088 ((1UL << (ses)->chan_count) - 1) 1089 #define CIFS_ALL_CHANS_GOOD(ses) \ 1090 (!(ses)->chans_need_reconnect) 1091 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1092 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1093 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1094 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1095 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1096 test_bit((index), &(ses)->chans_need_reconnect) 1097 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1098 ((ses)->chans[(index)].in_reconnect) 1099 1100 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1101 size_t chan_count; 1102 size_t chan_max; 1103 atomic_t chan_seq; /* round robin state */ 1104 1105 /* 1106 * chans_need_reconnect is a bitmap indicating which of the channels 1107 * under this smb session needs to be reconnected. 1108 * If not multichannel session, only one bit will be used. 1109 * 1110 * We will ask for sess and tcon reconnection only if all the 1111 * channels are marked for needing reconnection. This will 1112 * enable the sessions on top to continue to live till any 1113 * of the channels below are active. 1114 */ 1115 unsigned long chans_need_reconnect; 1116 /* ========= end: protected by chan_lock ======== */ 1117 struct cifs_ses *dfs_root_ses; 1118 struct nls_table *local_nls; 1119 }; 1120 1121 static inline bool 1122 cap_unix(struct cifs_ses *ses) 1123 { 1124 return ses->server->vals->cap_unix & ses->capabilities; 1125 } 1126 1127 /* 1128 * common struct for holding inode info when searching for or updating an 1129 * inode with new info 1130 */ 1131 1132 #define CIFS_FATTR_JUNCTION 0x1 1133 #define CIFS_FATTR_DELETE_PENDING 0x2 1134 #define CIFS_FATTR_NEED_REVAL 0x4 1135 #define CIFS_FATTR_INO_COLLISION 0x8 1136 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1137 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1138 1139 struct cifs_fattr { 1140 u32 cf_flags; 1141 u32 cf_cifsattrs; 1142 u64 cf_uniqueid; 1143 u64 cf_eof; 1144 u64 cf_bytes; 1145 u64 cf_createtime; 1146 kuid_t cf_uid; 1147 kgid_t cf_gid; 1148 umode_t cf_mode; 1149 dev_t cf_rdev; 1150 unsigned int cf_nlink; 1151 unsigned int cf_dtype; 1152 struct timespec64 cf_atime; 1153 struct timespec64 cf_mtime; 1154 struct timespec64 cf_ctime; 1155 u32 cf_cifstag; 1156 char *cf_symlink_target; 1157 }; 1158 1159 /* 1160 * there is one of these for each connection to a resource on a particular 1161 * session 1162 */ 1163 struct cifs_tcon { 1164 struct list_head tcon_list; 1165 int tc_count; 1166 struct list_head rlist; /* reconnect list */ 1167 spinlock_t tc_lock; /* protect anything here that is not protected */ 1168 atomic_t num_local_opens; /* num of all opens including disconnected */ 1169 atomic_t num_remote_opens; /* num of all network opens on server */ 1170 struct list_head openFileList; 1171 spinlock_t open_file_lock; /* protects list above */ 1172 struct cifs_ses *ses; /* pointer to session associated with */ 1173 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1174 char *nativeFileSystem; 1175 char *password; /* for share-level security */ 1176 __u32 tid; /* The 4 byte tree id */ 1177 __u16 Flags; /* optional support bits */ 1178 enum tid_status_enum status; 1179 atomic_t num_smbs_sent; 1180 union { 1181 struct { 1182 atomic_t num_writes; 1183 atomic_t num_reads; 1184 atomic_t num_flushes; 1185 atomic_t num_oplock_brks; 1186 atomic_t num_opens; 1187 atomic_t num_closes; 1188 atomic_t num_deletes; 1189 atomic_t num_mkdirs; 1190 atomic_t num_posixopens; 1191 atomic_t num_posixmkdirs; 1192 atomic_t num_rmdirs; 1193 atomic_t num_renames; 1194 atomic_t num_t2renames; 1195 atomic_t num_ffirst; 1196 atomic_t num_fnext; 1197 atomic_t num_fclose; 1198 atomic_t num_hardlinks; 1199 atomic_t num_symlinks; 1200 atomic_t num_locks; 1201 atomic_t num_acl_get; 1202 atomic_t num_acl_set; 1203 } cifs_stats; 1204 struct { 1205 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1206 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1207 } smb2_stats; 1208 } stats; 1209 __u64 bytes_read; 1210 __u64 bytes_written; 1211 spinlock_t stat_lock; /* protects the two fields above */ 1212 time64_t stats_from_time; 1213 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1214 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1215 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1216 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1217 bool pipe:1; /* set if connection to pipe share */ 1218 bool print:1; /* set if connection to printer share */ 1219 bool retry:1; 1220 bool nocase:1; 1221 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1222 bool nodelete:1; 1223 bool seal:1; /* transport encryption for this mounted share */ 1224 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1225 for this mount even if server would support */ 1226 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1227 bool local_lease:1; /* check leases (only) on local system not remote */ 1228 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1229 bool broken_sparse_sup; /* if server or share does not support sparse */ 1230 bool need_reconnect:1; /* connection reset, tid now invalid */ 1231 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1232 bool use_resilient:1; /* use resilient instead of durable handles */ 1233 bool use_persistent:1; /* use persistent instead of durable handles */ 1234 bool no_lease:1; /* Do not request leases on files or directories */ 1235 bool use_witness:1; /* use witness protocol */ 1236 __le32 capabilities; 1237 __u32 share_flags; 1238 __u32 maximal_access; 1239 __u32 vol_serial_number; 1240 __le64 vol_create_time; 1241 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1242 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1243 __u32 ss_flags; /* sector size flags */ 1244 __u32 perf_sector_size; /* best sector size for perf */ 1245 __u32 max_chunks; 1246 __u32 max_bytes_chunk; 1247 __u32 max_bytes_copy; 1248 __u32 max_cached_dirs; 1249 #ifdef CONFIG_CIFS_FSCACHE 1250 u64 resource_id; /* server resource id */ 1251 bool fscache_acquired; /* T if we've tried acquiring a cookie */ 1252 struct fscache_volume *fscache; /* cookie for share */ 1253 struct mutex fscache_lock; /* Prevent regetting a cookie */ 1254 #endif 1255 struct list_head pending_opens; /* list of incomplete opens */ 1256 struct cached_fids *cfids; 1257 /* BB add field for back pointer to sb struct(s)? */ 1258 #ifdef CONFIG_CIFS_DFS_UPCALL 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 bool offload:1; /* offload final part of _put to a wq */ 1415 unsigned int oplock_epoch; /* epoch from the lease break */ 1416 __u32 oplock_level; /* oplock/lease level from the lease break */ 1417 int count; 1418 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1419 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1420 struct cifs_search_info srch_inf; 1421 struct work_struct oplock_break; /* work for oplock breaks */ 1422 struct work_struct put; /* work for the final part of _put */ 1423 struct work_struct serverclose; /* work for serverclose */ 1424 struct delayed_work deferred; 1425 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1426 char *symlink_target; 1427 }; 1428 1429 struct cifs_io_parms { 1430 __u16 netfid; 1431 __u64 persistent_fid; /* persist file id for smb2 */ 1432 __u64 volatile_fid; /* volatile file id for smb2 */ 1433 __u32 pid; 1434 __u64 offset; 1435 unsigned int length; 1436 struct cifs_tcon *tcon; 1437 struct TCP_Server_Info *server; 1438 }; 1439 1440 struct cifs_aio_ctx { 1441 struct kref refcount; 1442 struct list_head list; 1443 struct mutex aio_mutex; 1444 struct completion done; 1445 struct iov_iter iter; 1446 struct kiocb *iocb; 1447 struct cifsFileInfo *cfile; 1448 struct bio_vec *bv; 1449 loff_t pos; 1450 unsigned int nr_pinned_pages; 1451 ssize_t rc; 1452 unsigned int len; 1453 unsigned int total_len; 1454 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1455 bool should_dirty; 1456 /* 1457 * Indicates if this aio_ctx is for direct_io, 1458 * If yes, iter is a copy of the user passed iov_iter 1459 */ 1460 bool direct_io; 1461 }; 1462 1463 /* asynchronous read support */ 1464 struct cifs_readdata { 1465 struct kref refcount; 1466 struct list_head list; 1467 struct completion done; 1468 struct cifsFileInfo *cfile; 1469 struct address_space *mapping; 1470 struct cifs_aio_ctx *ctx; 1471 __u64 offset; 1472 ssize_t got_bytes; 1473 unsigned int bytes; 1474 pid_t pid; 1475 int result; 1476 struct work_struct work; 1477 struct iov_iter iter; 1478 struct kvec iov[2]; 1479 struct TCP_Server_Info *server; 1480 #ifdef CONFIG_CIFS_SMB_DIRECT 1481 struct smbd_mr *mr; 1482 #endif 1483 struct cifs_credits credits; 1484 }; 1485 1486 /* asynchronous write support */ 1487 struct cifs_writedata { 1488 struct kref refcount; 1489 struct list_head list; 1490 struct completion done; 1491 enum writeback_sync_modes sync_mode; 1492 struct work_struct work; 1493 struct cifsFileInfo *cfile; 1494 struct cifs_aio_ctx *ctx; 1495 struct iov_iter iter; 1496 struct bio_vec *bv; 1497 __u64 offset; 1498 pid_t pid; 1499 unsigned int bytes; 1500 int result; 1501 struct TCP_Server_Info *server; 1502 #ifdef CONFIG_CIFS_SMB_DIRECT 1503 struct smbd_mr *mr; 1504 #endif 1505 struct cifs_credits credits; 1506 }; 1507 1508 /* 1509 * Take a reference on the file private data. Must be called with 1510 * cfile->file_info_lock held. 1511 */ 1512 static inline void 1513 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1514 { 1515 ++cifs_file->count; 1516 } 1517 1518 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1519 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1520 bool offload); 1521 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1522 1523 #define CIFS_CACHE_READ_FLG 1 1524 #define CIFS_CACHE_HANDLE_FLG 2 1525 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1526 #define CIFS_CACHE_WRITE_FLG 4 1527 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1528 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1529 1530 #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)) 1531 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1532 #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)) 1533 1534 /* 1535 * One of these for each file inode 1536 */ 1537 1538 struct cifsInodeInfo { 1539 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1540 bool can_cache_brlcks; 1541 struct list_head llist; /* locks helb by this inode */ 1542 /* 1543 * NOTE: Some code paths call down_read(lock_sem) twice, so 1544 * we must always use cifs_down_write() instead of down_write() 1545 * for this semaphore to avoid deadlocks. 1546 */ 1547 struct rw_semaphore lock_sem; /* protect the fields above */ 1548 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1549 struct list_head openFileList; 1550 spinlock_t open_file_lock; /* protects openFileList */ 1551 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1552 unsigned int oplock; /* oplock/lease level we have */ 1553 unsigned int epoch; /* used to track lease state changes */ 1554 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1555 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1556 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1557 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1558 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1559 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1560 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1561 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1562 unsigned long flags; 1563 spinlock_t writers_lock; 1564 unsigned int writers; /* Number of writers on this inode */ 1565 unsigned long time; /* jiffies of last update of inode */ 1566 u64 server_eof; /* current file size on server -- protected by i_lock */ 1567 u64 uniqueid; /* server inode number */ 1568 u64 createtime; /* creation time on server */ 1569 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1570 struct list_head deferred_closes; /* list of deferred closes */ 1571 spinlock_t deferred_lock; /* protection on deferred list */ 1572 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1573 char *symlink_target; 1574 __u32 reparse_tag; 1575 }; 1576 1577 static inline struct cifsInodeInfo * 1578 CIFS_I(struct inode *inode) 1579 { 1580 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1581 } 1582 1583 static inline struct cifs_sb_info * 1584 CIFS_SB(struct super_block *sb) 1585 { 1586 return sb->s_fs_info; 1587 } 1588 1589 static inline struct cifs_sb_info * 1590 CIFS_FILE_SB(struct file *file) 1591 { 1592 return CIFS_SB(file_inode(file)->i_sb); 1593 } 1594 1595 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1596 { 1597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1598 return '/'; 1599 else 1600 return '\\'; 1601 } 1602 1603 static inline void 1604 convert_delimiter(char *path, char delim) 1605 { 1606 char old_delim, *pos; 1607 1608 if (delim == '/') 1609 old_delim = '\\'; 1610 else 1611 old_delim = '/'; 1612 1613 pos = path; 1614 while ((pos = strchr(pos, old_delim))) 1615 *pos = delim; 1616 } 1617 1618 #define cifs_stats_inc atomic_inc 1619 1620 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1621 unsigned int bytes) 1622 { 1623 if (bytes) { 1624 spin_lock(&tcon->stat_lock); 1625 tcon->bytes_written += bytes; 1626 spin_unlock(&tcon->stat_lock); 1627 } 1628 } 1629 1630 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1631 unsigned int bytes) 1632 { 1633 spin_lock(&tcon->stat_lock); 1634 tcon->bytes_read += bytes; 1635 spin_unlock(&tcon->stat_lock); 1636 } 1637 1638 1639 /* 1640 * This is the prototype for the mid receive function. This function is for 1641 * receiving the rest of the SMB frame, starting with the WordCount (which is 1642 * just after the MID in struct smb_hdr). Note: 1643 * 1644 * - This will be called by cifsd, with no locks held. 1645 * - The mid will still be on the pending_mid_q. 1646 * - mid->resp_buf will point to the current buffer. 1647 * 1648 * Returns zero on a successful receive, or an error. The receive state in 1649 * the TCP_Server_Info will also be updated. 1650 */ 1651 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1652 struct mid_q_entry *mid); 1653 1654 /* 1655 * This is the prototype for the mid callback function. This is called once the 1656 * mid has been received off of the socket. When creating one, take special 1657 * care to avoid deadlocks. Things to bear in mind: 1658 * 1659 * - it will be called by cifsd, with no locks held 1660 * - the mid will be removed from any lists 1661 */ 1662 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1663 1664 /* 1665 * This is the protopyte for mid handle function. This is called once the mid 1666 * has been recognized after decryption of the message. 1667 */ 1668 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1669 struct mid_q_entry *mid); 1670 1671 /* one of these for every pending CIFS request to the server */ 1672 struct mid_q_entry { 1673 struct list_head qhead; /* mids waiting on reply from this server */ 1674 struct kref refcount; 1675 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1676 __u64 mid; /* multiplex id */ 1677 __u16 credits; /* number of credits consumed by this mid */ 1678 __u16 credits_received; /* number of credits from the response */ 1679 __u32 pid; /* process id */ 1680 __u32 sequence_number; /* for CIFS signing */ 1681 unsigned long when_alloc; /* when mid was created */ 1682 #ifdef CONFIG_CIFS_STATS2 1683 unsigned long when_sent; /* time when smb send finished */ 1684 unsigned long when_received; /* when demux complete (taken off wire) */ 1685 #endif 1686 mid_receive_t *receive; /* call receive callback */ 1687 mid_callback_t *callback; /* call completion callback */ 1688 mid_handle_t *handle; /* call handle mid callback */ 1689 void *callback_data; /* general purpose pointer for callback */ 1690 struct task_struct *creator; 1691 void *resp_buf; /* pointer to received SMB header */ 1692 unsigned int resp_buf_size; 1693 int mid_state; /* wish this were enum but can not pass to wait_event */ 1694 unsigned int mid_flags; 1695 __le16 command; /* smb command code */ 1696 unsigned int optype; /* operation type */ 1697 bool large_buf:1; /* if valid response, is pointer to large buf */ 1698 bool multiRsp:1; /* multiple trans2 responses for one request */ 1699 bool multiEnd:1; /* both received */ 1700 bool decrypted:1; /* decrypted entry */ 1701 }; 1702 1703 struct close_cancelled_open { 1704 struct cifs_fid fid; 1705 struct cifs_tcon *tcon; 1706 struct work_struct work; 1707 __u64 mid; 1708 __u16 cmd; 1709 }; 1710 1711 /* Make code in transport.c a little cleaner by moving 1712 update of optional stats into function below */ 1713 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1714 { 1715 atomic_inc(&server->in_send); 1716 } 1717 1718 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1719 { 1720 atomic_dec(&server->in_send); 1721 } 1722 1723 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1724 { 1725 atomic_inc(&server->num_waiters); 1726 } 1727 1728 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1729 { 1730 atomic_dec(&server->num_waiters); 1731 } 1732 1733 #ifdef CONFIG_CIFS_STATS2 1734 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1735 { 1736 mid->when_sent = jiffies; 1737 } 1738 #else 1739 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1740 { 1741 } 1742 #endif 1743 1744 /* for pending dnotify requests */ 1745 struct dir_notify_req { 1746 struct list_head lhead; 1747 __le16 Pid; 1748 __le16 PidHigh; 1749 __u16 Mid; 1750 __u16 Tid; 1751 __u16 Uid; 1752 __u16 netfid; 1753 __u32 filter; /* CompletionFilter (for multishot) */ 1754 int multishot; 1755 struct file *pfile; 1756 }; 1757 1758 struct dfs_info3_param { 1759 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1760 int path_consumed; 1761 int server_type; 1762 int ref_flag; 1763 char *path_name; 1764 char *node_name; 1765 int ttl; 1766 }; 1767 1768 struct file_list { 1769 struct list_head list; 1770 struct cifsFileInfo *cfile; 1771 }; 1772 1773 struct cifs_mount_ctx { 1774 struct cifs_sb_info *cifs_sb; 1775 struct smb3_fs_context *fs_ctx; 1776 unsigned int xid; 1777 struct TCP_Server_Info *server; 1778 struct cifs_ses *ses; 1779 struct cifs_tcon *tcon; 1780 }; 1781 1782 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1783 { 1784 kfree(param->path_name); 1785 kfree(param->node_name); 1786 } 1787 1788 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1789 { 1790 if (param) 1791 __free_dfs_info_param(param); 1792 } 1793 1794 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1795 { 1796 if (param) { 1797 __free_dfs_info_param(param); 1798 memset(param, 0, sizeof(*param)); 1799 } 1800 } 1801 1802 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1803 int number_of_items) 1804 { 1805 int i; 1806 1807 if ((number_of_items == 0) || (param == NULL)) 1808 return; 1809 for (i = 0; i < number_of_items; i++) { 1810 kfree(param[i].path_name); 1811 kfree(param[i].node_name); 1812 } 1813 kfree(param); 1814 } 1815 1816 static inline bool is_interrupt_error(int error) 1817 { 1818 switch (error) { 1819 case -EINTR: 1820 case -ERESTARTSYS: 1821 case -ERESTARTNOHAND: 1822 case -ERESTARTNOINTR: 1823 return true; 1824 } 1825 return false; 1826 } 1827 1828 static inline bool is_retryable_error(int error) 1829 { 1830 if (is_interrupt_error(error) || error == -EAGAIN) 1831 return true; 1832 return false; 1833 } 1834 1835 static inline bool is_replayable_error(int error) 1836 { 1837 if (error == -EAGAIN || error == -ECONNABORTED) 1838 return true; 1839 return false; 1840 } 1841 1842 1843 /* cifs_get_writable_file() flags */ 1844 #define FIND_WR_ANY 0 1845 #define FIND_WR_FSUID_ONLY 1 1846 #define FIND_WR_WITH_DELETE 2 1847 1848 #define MID_FREE 0 1849 #define MID_REQUEST_ALLOCATED 1 1850 #define MID_REQUEST_SUBMITTED 2 1851 #define MID_RESPONSE_RECEIVED 4 1852 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1853 #define MID_RESPONSE_MALFORMED 0x10 1854 #define MID_SHUTDOWN 0x20 1855 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1856 1857 /* Flags */ 1858 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1859 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1860 1861 /* Types of response buffer returned from SendReceive2 */ 1862 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1863 #define CIFS_SMALL_BUFFER 1 1864 #define CIFS_LARGE_BUFFER 2 1865 #define CIFS_IOVEC 4 /* array of response buffers */ 1866 1867 /* Type of Request to SendReceive2 */ 1868 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1869 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1870 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1871 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1872 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1873 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1874 1875 /* Type of request operation */ 1876 #define CIFS_ECHO_OP 0x080 /* echo request */ 1877 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1878 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1879 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1880 /* Lower bitmask values are reserved by others below. */ 1881 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1882 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1883 1884 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1885 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1886 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1887 1888 /* Security Flags: indicate type of session setup needed */ 1889 #define CIFSSEC_MAY_SIGN 0x00001 1890 #define CIFSSEC_MAY_NTLMV2 0x00004 1891 #define CIFSSEC_MAY_KRB5 0x00008 1892 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1893 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1894 1895 #define CIFSSEC_MUST_SIGN 0x01001 1896 /* note that only one of the following can be set so the 1897 result of setting MUST flags more than once will be to 1898 require use of the stronger protocol */ 1899 #define CIFSSEC_MUST_NTLMV2 0x04004 1900 #define CIFSSEC_MUST_KRB5 0x08008 1901 #ifdef CONFIG_CIFS_UPCALL 1902 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1903 #else 1904 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1905 #endif /* UPCALL */ 1906 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1907 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1908 1909 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1910 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1911 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1912 /* 1913 ***************************************************************** 1914 * All constants go here 1915 ***************************************************************** 1916 */ 1917 1918 #define UID_HASH (16) 1919 1920 /* 1921 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1922 * following to be declared. 1923 */ 1924 1925 /**************************************************************************** 1926 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1927 * to the locking order. i.e. if two locks are to be held together, the lock that 1928 * appears higher in this list needs to be taken before the other. 1929 * 1930 * If you hold a lock that is lower in this list, and you need to take a higher lock 1931 * (or if you think that one of the functions that you're calling may need to), first 1932 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1933 * ensure that locks are picked up only in one direction in the below table 1934 * (top to bottom). 1935 * 1936 * Also, if you expect a function to be called with a lock held, explicitly document 1937 * this in the comments on top of your function definition. 1938 * 1939 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1940 * possible. Blocking / calling other functions with a lock held always increase 1941 * the risk of a possible deadlock. 1942 * 1943 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1944 * debug. Also, any new lock that you introduce, please add to this list in the correct 1945 * order. 1946 * 1947 * Please populate this list whenever you introduce new locks in your changes. Or in 1948 * case I've missed some existing locks. Please ensure that it's added in the list 1949 * based on the locking order expected. 1950 * 1951 * ===================================================================================== 1952 * Lock Protects Initialization fn 1953 * ===================================================================================== 1954 * vol_list_lock 1955 * vol_info->ctx_lock vol_info->ctx 1956 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1957 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1958 * reconnect_mutex 1959 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1960 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1961 * cifs_tcon 1962 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1963 * cifs_tcon->pending_opens 1964 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1965 * cifs_tcon->bytes_written 1966 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1967 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1968 * GlobalCurrentXid 1969 * GlobalTotalActiveXid 1970 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1971 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1972 * ->CurrentMid 1973 * (any changes in mid_q_entry fields) 1974 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1975 * ->credits 1976 * ->echo_credits 1977 * ->oplock_credits 1978 * ->reconnect_instance 1979 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1980 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1981 * ->iface_count 1982 * ->iface_last_update 1983 * cifs_ses->chan_lock cifs_ses->chans 1984 * ->chans_need_reconnect 1985 * ->chans_in_reconnect 1986 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 1987 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 1988 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 1989 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 1990 * ->can_cache_brlcks 1991 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 1992 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 1993 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 1994 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 1995 * ->invalidHandle initiate_cifs_search 1996 * ->oplock_break_cancelled 1997 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 1998 ****************************************************************************/ 1999 2000 #ifdef DECLARE_GLOBALS_HERE 2001 #define GLOBAL_EXTERN 2002 #else 2003 #define GLOBAL_EXTERN extern 2004 #endif 2005 2006 /* 2007 * the list of TCP_Server_Info structures, ie each of the sockets 2008 * connecting our client to a distinct server (ip address), is 2009 * chained together by cifs_tcp_ses_list. The list of all our SMB 2010 * sessions (and from that the tree connections) can be found 2011 * by iterating over cifs_tcp_ses_list 2012 */ 2013 extern struct list_head cifs_tcp_ses_list; 2014 2015 /* 2016 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2017 * tcp session, and the list of tcon's per smb session. It also protects 2018 * the reference counters for the server, smb session, and tcon. 2019 * generally the locks should be taken in order tcp_ses_lock before 2020 * tcon->open_file_lock and that before file->file_info_lock since the 2021 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2022 */ 2023 extern spinlock_t cifs_tcp_ses_lock; 2024 2025 /* 2026 * Global transaction id (XID) information 2027 */ 2028 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2029 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2030 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2031 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2032 2033 /* 2034 * Global counters, updated atomically 2035 */ 2036 extern atomic_t sesInfoAllocCount; 2037 extern atomic_t tconInfoAllocCount; 2038 extern atomic_t tcpSesNextId; 2039 extern atomic_t tcpSesAllocCount; 2040 extern atomic_t tcpSesReconnectCount; 2041 extern atomic_t tconInfoReconnectCount; 2042 2043 /* Various Debug counters */ 2044 extern atomic_t buf_alloc_count; /* current number allocated */ 2045 extern atomic_t small_buf_alloc_count; 2046 #ifdef CONFIG_CIFS_STATS2 2047 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2048 extern atomic_t total_small_buf_alloc_count; 2049 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2050 #endif 2051 2052 /* Misc globals */ 2053 extern bool enable_oplocks; /* enable or disable oplocks */ 2054 extern bool lookupCacheEnabled; 2055 extern unsigned int global_secflags; /* if on, session setup sent 2056 with more secure ntlmssp2 challenge/resp */ 2057 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2058 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2059 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2060 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2061 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2062 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2063 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2064 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2065 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2066 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2067 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2068 extern atomic_t mid_count; 2069 2070 void cifs_oplock_break(struct work_struct *work); 2071 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2072 void smb2_deferred_work_close(struct work_struct *work); 2073 2074 extern const struct slow_work_ops cifs_oplock_break_ops; 2075 extern struct workqueue_struct *cifsiod_wq; 2076 extern struct workqueue_struct *decrypt_wq; 2077 extern struct workqueue_struct *fileinfo_put_wq; 2078 extern struct workqueue_struct *cifsoplockd_wq; 2079 extern struct workqueue_struct *deferredclose_wq; 2080 extern struct workqueue_struct *serverclose_wq; 2081 extern __u32 cifs_lock_secret; 2082 2083 extern mempool_t *cifs_mid_poolp; 2084 2085 /* Operations for different SMB versions */ 2086 #define SMB1_VERSION_STRING "1.0" 2087 #define SMB20_VERSION_STRING "2.0" 2088 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2089 extern struct smb_version_operations smb1_operations; 2090 extern struct smb_version_values smb1_values; 2091 extern struct smb_version_operations smb20_operations; 2092 extern struct smb_version_values smb20_values; 2093 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2094 #define SMB21_VERSION_STRING "2.1" 2095 extern struct smb_version_operations smb21_operations; 2096 extern struct smb_version_values smb21_values; 2097 #define SMBDEFAULT_VERSION_STRING "default" 2098 extern struct smb_version_values smbdefault_values; 2099 #define SMB3ANY_VERSION_STRING "3" 2100 extern struct smb_version_values smb3any_values; 2101 #define SMB30_VERSION_STRING "3.0" 2102 extern struct smb_version_operations smb30_operations; 2103 extern struct smb_version_values smb30_values; 2104 #define SMB302_VERSION_STRING "3.02" 2105 #define ALT_SMB302_VERSION_STRING "3.0.2" 2106 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2107 extern struct smb_version_values smb302_values; 2108 #define SMB311_VERSION_STRING "3.1.1" 2109 #define ALT_SMB311_VERSION_STRING "3.11" 2110 extern struct smb_version_operations smb311_operations; 2111 extern struct smb_version_values smb311_values; 2112 2113 static inline char *get_security_type_str(enum securityEnum sectype) 2114 { 2115 switch (sectype) { 2116 case RawNTLMSSP: 2117 return "RawNTLMSSP"; 2118 case Kerberos: 2119 return "Kerberos"; 2120 case NTLMv2: 2121 return "NTLMv2"; 2122 default: 2123 return "Unknown"; 2124 } 2125 } 2126 2127 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2128 { 2129 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2130 } 2131 2132 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2133 { 2134 /* 2135 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2136 * Subsystem Notifies That a Share Is a DFS Share. 2137 * 2138 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2139 * Application Updates a Share. 2140 */ 2141 if (!tcon || !tcon->ses || !tcon->ses->server) 2142 return false; 2143 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2144 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2145 } 2146 2147 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2148 const struct dfs_info3_param *ref) 2149 { 2150 /* 2151 * Check if all targets are capable of handling DFS referrals as per 2152 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2153 */ 2154 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2155 } 2156 2157 static inline u64 cifs_flock_len(const struct file_lock *fl) 2158 { 2159 return (u64)fl->fl_end - fl->fl_start + 1; 2160 } 2161 2162 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2163 { 2164 if (WARN_ON_ONCE(!ses || !ses->server)) 2165 return 0; 2166 /* 2167 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2168 * servers do require it during NTLMSSP. 2169 */ 2170 if (ses->server->dialect <= SMB20_PROT_ID) 2171 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2172 return sizeof(ses->workstation_name); 2173 } 2174 2175 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2176 { 2177 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2178 dst->AccessFlags = src->AccessFlags; 2179 dst->CurrentByteOffset = src->CurrentByteOffset; 2180 dst->Mode = src->Mode; 2181 dst->AlignmentRequirement = src->AlignmentRequirement; 2182 dst->FileNameLength = src->FileNameLength; 2183 } 2184 2185 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2186 int num_rqst, 2187 const u8 *sig) 2188 { 2189 unsigned int len, skip; 2190 unsigned int nents = 0; 2191 unsigned long addr; 2192 size_t data_size; 2193 int i, j; 2194 2195 /* 2196 * The first rqst has a transform header where the first 20 bytes are 2197 * not part of the encrypted blob. 2198 */ 2199 skip = 20; 2200 2201 /* Assumes the first rqst has a transform header as the first iov. 2202 * I.e. 2203 * rqst[0].rq_iov[0] is transform header 2204 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2205 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2206 */ 2207 for (i = 0; i < num_rqst; i++) { 2208 data_size = iov_iter_count(&rqst[i].rq_iter); 2209 2210 /* We really don't want a mixture of pinned and unpinned pages 2211 * in the sglist. It's hard to keep track of which is what. 2212 * Instead, we convert to a BVEC-type iterator higher up. 2213 */ 2214 if (data_size && 2215 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2216 return -EIO; 2217 2218 /* We also don't want to have any extra refs or pins to clean 2219 * up in the sglist. 2220 */ 2221 if (data_size && 2222 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2223 return -EIO; 2224 2225 for (j = 0; j < rqst[i].rq_nvec; j++) { 2226 struct kvec *iov = &rqst[i].rq_iov[j]; 2227 2228 addr = (unsigned long)iov->iov_base + skip; 2229 if (unlikely(is_vmalloc_addr((void *)addr))) { 2230 len = iov->iov_len - skip; 2231 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2232 PAGE_SIZE); 2233 } else { 2234 nents++; 2235 } 2236 skip = 0; 2237 } 2238 if (data_size) 2239 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2240 } 2241 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2242 return nents; 2243 } 2244 2245 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2246 * stack object as buf. 2247 */ 2248 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2249 const void *buf, 2250 unsigned int buflen) 2251 { 2252 unsigned long addr = (unsigned long)buf; 2253 unsigned int off = offset_in_page(addr); 2254 2255 addr &= PAGE_MASK; 2256 if (unlikely(is_vmalloc_addr((void *)addr))) { 2257 do { 2258 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2259 2260 sg_set_page(&sgtable->sgl[sgtable->nents++], 2261 vmalloc_to_page((void *)addr), len, off); 2262 2263 off = 0; 2264 addr += PAGE_SIZE; 2265 buflen -= len; 2266 } while (buflen); 2267 } else { 2268 sg_set_page(&sgtable->sgl[sgtable->nents++], 2269 virt_to_page((void *)addr), buflen, off); 2270 } 2271 } 2272 2273 struct smb2_compound_vars { 2274 struct cifs_open_parms oparms; 2275 struct kvec rsp_iov[3]; 2276 struct smb_rqst rqst[3]; 2277 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2278 struct kvec qi_iov; 2279 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2280 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2281 struct kvec close_iov; 2282 struct smb2_file_rename_info rename_info; 2283 struct smb2_file_link_info link_info; 2284 }; 2285 2286 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2287 { 2288 bool ret; 2289 2290 spin_lock(&ses->ses_lock); 2291 ret = ses->ses_status == SES_EXITING; 2292 spin_unlock(&ses->ses_lock); 2293 return ret; 2294 } 2295 2296 #endif /* _CIFS_GLOB_H */ 2297