1 /* SPDX-License-Identifier: LGPL-2.1 */ 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2008 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * Jeremy Allison (jra@samba.org) 7 * 8 */ 9 #ifndef _CIFS_GLOB_H 10 #define _CIFS_GLOB_H 11 12 #include <linux/in.h> 13 #include <linux/in6.h> 14 #include <linux/inet.h> 15 #include <linux/slab.h> 16 #include <linux/scatterlist.h> 17 #include <linux/mm.h> 18 #include <linux/mempool.h> 19 #include <linux/workqueue.h> 20 #include <linux/utsname.h> 21 #include <linux/sched/mm.h> 22 #include <linux/netfs.h> 23 #include "cifs_fs_sb.h" 24 #include "cifsacl.h" 25 #include <crypto/internal/hash.h> 26 #include <uapi/linux/cifs/cifs_mount.h> 27 #include "../common/smb2pdu.h" 28 #include "smb2pdu.h" 29 #include <linux/filelock.h> 30 31 #define SMB_PATH_MAX 260 32 #define CIFS_PORT 445 33 #define RFC1001_PORT 139 34 35 /* 36 * The sizes of various internal tables and strings 37 */ 38 #define MAX_UID_INFO 16 39 #define MAX_SES_INFO 2 40 #define MAX_TCON_INFO 4 41 42 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1) 43 44 #define CIFS_MIN_RCV_POOL 4 45 46 #define MAX_REOPEN_ATT 5 /* these many maximum attempts to reopen a file */ 47 /* 48 * default attribute cache timeout (jiffies) 49 */ 50 #define CIFS_DEF_ACTIMEO (1 * HZ) 51 52 /* 53 * max sleep time before retry to server 54 */ 55 #define CIFS_MAX_SLEEP 2000 56 57 /* 58 * max attribute cache timeout (jiffies) - 2^30 59 */ 60 #define CIFS_MAX_ACTIMEO (1 << 30) 61 62 /* 63 * Max persistent and resilient handle timeout (milliseconds). 64 * Windows durable max was 960000 (16 minutes) 65 */ 66 #define SMB3_MAX_HANDLE_TIMEOUT 960000 67 68 /* 69 * MAX_REQ is the maximum number of requests that WE will send 70 * on one socket concurrently. 71 */ 72 #define CIFS_MAX_REQ 32767 73 74 #define RFC1001_NAME_LEN 15 75 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1) 76 77 /* maximum length of ip addr as a string (including ipv6 and sctp) */ 78 #define SERVER_NAME_LENGTH 80 79 #define SERVER_NAME_LEN_WITH_NULL (SERVER_NAME_LENGTH + 1) 80 81 /* echo interval in seconds */ 82 #define SMB_ECHO_INTERVAL_MIN 1 83 #define SMB_ECHO_INTERVAL_MAX 600 84 #define SMB_ECHO_INTERVAL_DEFAULT 60 85 86 /* smb multichannel query server interfaces interval in seconds */ 87 #define SMB_INTERFACE_POLL_INTERVAL 600 88 89 /* maximum number of PDUs in one compound */ 90 #define MAX_COMPOUND 7 91 92 /* 93 * Default number of credits to keep available for SMB3. 94 * This value is chosen somewhat arbitrarily. The Windows client 95 * defaults to 128 credits, the Windows server allows clients up to 96 * 512 credits (or 8K for later versions), and the NetApp server 97 * does not limit clients at all. Choose a high enough default value 98 * such that the client shouldn't limit performance, but allow mount 99 * to override (until you approach 64K, where we limit credits to 65000 100 * to reduce possibility of seeing more server credit overflow bugs. 101 */ 102 #define SMB2_MAX_CREDITS_AVAILABLE 32000 103 104 #include "cifspdu.h" 105 106 #ifndef XATTR_DOS_ATTRIB 107 #define XATTR_DOS_ATTRIB "user.DOSATTRIB" 108 #endif 109 110 #define CIFS_MAX_WORKSTATION_LEN (__NEW_UTS_LEN + 1) /* reasonable max for client */ 111 112 #define CIFS_DFS_ROOT_SES(ses) ((ses)->dfs_root_ses ?: (ses)) 113 114 /* 115 * CIFS vfs client Status information (based on what we know.) 116 */ 117 118 /* associated with each connection */ 119 enum statusEnum { 120 CifsNew = 0, 121 CifsGood, 122 CifsExiting, 123 CifsNeedReconnect, 124 CifsNeedNegotiate, 125 CifsInNegotiate, 126 }; 127 128 /* associated with each smb session */ 129 enum ses_status_enum { 130 SES_NEW = 0, 131 SES_GOOD, 132 SES_EXITING, 133 SES_NEED_RECON, 134 SES_IN_SETUP 135 }; 136 137 /* associated with each tree connection to the server */ 138 enum tid_status_enum { 139 TID_NEW = 0, 140 TID_GOOD, 141 TID_EXITING, 142 TID_NEED_RECON, 143 TID_NEED_TCON, 144 TID_IN_TCON, 145 TID_NEED_FILES_INVALIDATE, /* currently unused */ 146 TID_IN_FILES_INVALIDATE 147 }; 148 149 enum securityEnum { 150 Unspecified = 0, /* not specified */ 151 NTLMv2, /* Legacy NTLM auth with NTLMv2 hash */ 152 RawNTLMSSP, /* NTLMSSP without SPNEGO, NTLMv2 hash */ 153 Kerberos, /* Kerberos via SPNEGO */ 154 }; 155 156 struct session_key { 157 unsigned int len; 158 char *response; 159 }; 160 161 /* crypto hashing related structure/fields, not specific to a sec mech */ 162 struct cifs_secmech { 163 struct shash_desc *hmacmd5; /* hmacmd5 hash function, for NTLMv2/CR1 hashes */ 164 struct shash_desc *md5; /* md5 hash function, for CIFS/SMB1 signatures */ 165 struct shash_desc *hmacsha256; /* hmac-sha256 hash function, for SMB2 signatures */ 166 struct shash_desc *sha512; /* sha512 hash function, for SMB3.1.1 preauth hash */ 167 struct shash_desc *aes_cmac; /* block-cipher based MAC function, for SMB3 signatures */ 168 169 struct crypto_aead *enc; /* smb3 encryption AEAD TFM (AES-CCM and AES-GCM) */ 170 struct crypto_aead *dec; /* smb3 decryption AEAD TFM (AES-CCM and AES-GCM) */ 171 }; 172 173 /* per smb session structure/fields */ 174 struct ntlmssp_auth { 175 bool sesskey_per_smbsess; /* whether session key is per smb session */ 176 __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */ 177 __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */ 178 unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */ 179 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */ 180 }; 181 182 struct cifs_cred { 183 int uid; 184 int gid; 185 int mode; 186 int cecount; 187 struct cifs_sid osid; 188 struct cifs_sid gsid; 189 struct cifs_ntace *ntaces; 190 struct cifs_ace *aces; 191 }; 192 193 struct cifs_open_info_data { 194 bool adjust_tz; 195 union { 196 bool reparse_point; 197 bool symlink; 198 }; 199 struct { 200 /* ioctl response buffer */ 201 struct { 202 int buftype; 203 struct kvec iov; 204 } io; 205 __u32 tag; 206 union { 207 struct reparse_data_buffer *buf; 208 struct reparse_posix_data *posix; 209 }; 210 } reparse; 211 char *symlink_target; 212 struct cifs_sid posix_owner; 213 struct cifs_sid posix_group; 214 union { 215 struct smb2_file_all_info fi; 216 struct smb311_posix_qinfo posix_fi; 217 }; 218 }; 219 220 static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data) 221 { 222 struct smb2_file_all_info *fi = &data->fi; 223 u32 attrs = le32_to_cpu(fi->Attributes); 224 bool ret; 225 226 ret = data->reparse_point || (attrs & ATTR_REPARSE); 227 if (ret) 228 attrs |= ATTR_REPARSE; 229 fi->Attributes = cpu_to_le32(attrs); 230 return ret; 231 } 232 233 /* 234 ***************************************************************** 235 * Except the CIFS PDUs themselves all the 236 * globally interesting structs should go here 237 ***************************************************************** 238 */ 239 240 /* 241 * A smb_rqst represents a complete request to be issued to a server. It's 242 * formed by a kvec array, followed by an array of pages. Page data is assumed 243 * to start at the beginning of the first page. 244 */ 245 struct smb_rqst { 246 struct kvec *rq_iov; /* array of kvecs */ 247 unsigned int rq_nvec; /* number of kvecs in array */ 248 size_t rq_iter_size; /* Amount of data in ->rq_iter */ 249 struct iov_iter rq_iter; /* Data iterator */ 250 struct xarray rq_buffer; /* Page buffer for encryption */ 251 }; 252 253 struct mid_q_entry; 254 struct TCP_Server_Info; 255 struct cifsFileInfo; 256 struct cifs_ses; 257 struct cifs_tcon; 258 struct dfs_info3_param; 259 struct cifs_fattr; 260 struct smb3_fs_context; 261 struct cifs_fid; 262 struct cifs_readdata; 263 struct cifs_writedata; 264 struct cifs_io_parms; 265 struct cifs_search_info; 266 struct cifsInodeInfo; 267 struct cifs_open_parms; 268 struct cifs_credits; 269 270 struct smb_version_operations { 271 int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *, 272 struct mid_q_entry *); 273 bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *); 274 /* setup request: allocate mid, sign message */ 275 struct mid_q_entry *(*setup_request)(struct cifs_ses *, 276 struct TCP_Server_Info *, 277 struct smb_rqst *); 278 /* setup async request: allocate mid, sign message */ 279 struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *, 280 struct smb_rqst *); 281 /* check response: verify signature, map error */ 282 int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *, 283 bool); 284 void (*add_credits)(struct TCP_Server_Info *server, 285 const struct cifs_credits *credits, 286 const int optype); 287 void (*set_credits)(struct TCP_Server_Info *, const int); 288 int * (*get_credits_field)(struct TCP_Server_Info *, const int); 289 unsigned int (*get_credits)(struct mid_q_entry *); 290 __u64 (*get_next_mid)(struct TCP_Server_Info *); 291 void (*revert_current_mid)(struct TCP_Server_Info *server, 292 const unsigned int val); 293 /* data offset from read response message */ 294 unsigned int (*read_data_offset)(char *); 295 /* 296 * Data length from read response message 297 * When in_remaining is true, the returned data length is in 298 * message field DataRemaining for out-of-band data read (e.g through 299 * Memory Registration RDMA write in SMBD). 300 * Otherwise, the returned data length is in message field DataLength. 301 */ 302 unsigned int (*read_data_length)(char *, bool in_remaining); 303 /* map smb to linux error */ 304 int (*map_error)(char *, bool); 305 /* find mid corresponding to the response message */ 306 struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *); 307 void (*dump_detail)(void *buf, struct TCP_Server_Info *ptcp_info); 308 void (*clear_stats)(struct cifs_tcon *); 309 void (*print_stats)(struct seq_file *m, struct cifs_tcon *); 310 void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *); 311 /* verify the message */ 312 int (*check_message)(char *, unsigned int, struct TCP_Server_Info *); 313 bool (*is_oplock_break)(char *, struct TCP_Server_Info *); 314 int (*handle_cancelled_mid)(struct mid_q_entry *, struct TCP_Server_Info *); 315 void (*downgrade_oplock)(struct TCP_Server_Info *server, 316 struct cifsInodeInfo *cinode, __u32 oplock, 317 unsigned int epoch, bool *purge_cache); 318 /* process transaction2 response */ 319 bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *, 320 char *, int); 321 /* check if we need to negotiate */ 322 bool (*need_neg)(struct TCP_Server_Info *); 323 /* negotiate to the server */ 324 int (*negotiate)(const unsigned int xid, 325 struct cifs_ses *ses, 326 struct TCP_Server_Info *server); 327 /* set negotiated write size */ 328 unsigned int (*negotiate_wsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 329 /* set negotiated read size */ 330 unsigned int (*negotiate_rsize)(struct cifs_tcon *tcon, struct smb3_fs_context *ctx); 331 /* setup smb sessionn */ 332 int (*sess_setup)(const unsigned int, struct cifs_ses *, 333 struct TCP_Server_Info *server, 334 const struct nls_table *); 335 /* close smb session */ 336 int (*logoff)(const unsigned int, struct cifs_ses *); 337 /* connect to a server share */ 338 int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *, 339 struct cifs_tcon *, const struct nls_table *); 340 /* close tree connecion */ 341 int (*tree_disconnect)(const unsigned int, struct cifs_tcon *); 342 /* get DFS referrals */ 343 int (*get_dfs_refer)(const unsigned int, struct cifs_ses *, 344 const char *, struct dfs_info3_param **, 345 unsigned int *, const struct nls_table *, int); 346 /* informational QFS call */ 347 void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, 348 struct cifs_sb_info *); 349 /* query for server interfaces */ 350 int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, 351 bool); 352 /* check if a path is accessible or not */ 353 int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, 354 struct cifs_sb_info *, const char *); 355 /* query path data from the server */ 356 int (*query_path_info)(const unsigned int xid, 357 struct cifs_tcon *tcon, 358 struct cifs_sb_info *cifs_sb, 359 const char *full_path, 360 struct cifs_open_info_data *data); 361 /* query file data from the server */ 362 int (*query_file_info)(const unsigned int xid, struct cifs_tcon *tcon, 363 struct cifsFileInfo *cfile, struct cifs_open_info_data *data); 364 /* query reparse point to determine which type of special file */ 365 int (*query_reparse_point)(const unsigned int xid, 366 struct cifs_tcon *tcon, 367 struct cifs_sb_info *cifs_sb, 368 const char *full_path, 369 u32 *tag, struct kvec *rsp, 370 int *rsp_buftype); 371 /* get server index number */ 372 int (*get_srv_inum)(const unsigned int xid, struct cifs_tcon *tcon, 373 struct cifs_sb_info *cifs_sb, const char *full_path, u64 *uniqueid, 374 struct cifs_open_info_data *data); 375 /* set size by path */ 376 int (*set_path_size)(const unsigned int, struct cifs_tcon *, 377 const char *, __u64, struct cifs_sb_info *, bool); 378 /* set size by file handle */ 379 int (*set_file_size)(const unsigned int, struct cifs_tcon *, 380 struct cifsFileInfo *, __u64, bool); 381 /* set attributes */ 382 int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *, 383 const unsigned int); 384 int (*set_compression)(const unsigned int, struct cifs_tcon *, 385 struct cifsFileInfo *); 386 /* check if we can send an echo or nor */ 387 bool (*can_echo)(struct TCP_Server_Info *); 388 /* send echo request */ 389 int (*echo)(struct TCP_Server_Info *); 390 /* create directory */ 391 int (*posix_mkdir)(const unsigned int xid, struct inode *inode, 392 umode_t mode, struct cifs_tcon *tcon, 393 const char *full_path, 394 struct cifs_sb_info *cifs_sb); 395 int (*mkdir)(const unsigned int xid, struct inode *inode, umode_t mode, 396 struct cifs_tcon *tcon, const char *name, 397 struct cifs_sb_info *sb); 398 /* set info on created directory */ 399 void (*mkdir_setinfo)(struct inode *, const char *, 400 struct cifs_sb_info *, struct cifs_tcon *, 401 const unsigned int); 402 /* remove directory */ 403 int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *, 404 struct cifs_sb_info *); 405 /* unlink file */ 406 int (*unlink)(const unsigned int, struct cifs_tcon *, const char *, 407 struct cifs_sb_info *); 408 /* open, rename and delete file */ 409 int (*rename_pending_delete)(const char *, struct dentry *, 410 const unsigned int); 411 /* send rename request */ 412 int (*rename)(const unsigned int xid, 413 struct cifs_tcon *tcon, 414 struct dentry *source_dentry, 415 const char *from_name, const char *to_name, 416 struct cifs_sb_info *cifs_sb); 417 /* send create hardlink request */ 418 int (*create_hardlink)(const unsigned int xid, 419 struct cifs_tcon *tcon, 420 struct dentry *source_dentry, 421 const char *from_name, const char *to_name, 422 struct cifs_sb_info *cifs_sb); 423 /* query symlink target */ 424 int (*query_symlink)(const unsigned int xid, 425 struct cifs_tcon *tcon, 426 struct cifs_sb_info *cifs_sb, 427 const char *full_path, 428 char **target_path); 429 /* open a file for non-posix mounts */ 430 int (*open)(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 431 void *buf); 432 /* set fid protocol-specific info */ 433 void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32); 434 /* close a file */ 435 int (*close)(const unsigned int, struct cifs_tcon *, 436 struct cifs_fid *); 437 /* close a file, returning file attributes and timestamps */ 438 int (*close_getattr)(const unsigned int xid, struct cifs_tcon *tcon, 439 struct cifsFileInfo *pfile_info); 440 /* send a flush request to the server */ 441 int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); 442 /* async read from the server */ 443 int (*async_readv)(struct cifs_readdata *); 444 /* async write to the server */ 445 int (*async_writev)(struct cifs_writedata *, 446 void (*release)(struct kref *)); 447 /* sync read from the server */ 448 int (*sync_read)(const unsigned int, struct cifs_fid *, 449 struct cifs_io_parms *, unsigned int *, char **, 450 int *); 451 /* sync write to the server */ 452 int (*sync_write)(const unsigned int, struct cifs_fid *, 453 struct cifs_io_parms *, unsigned int *, struct kvec *, 454 unsigned long); 455 /* open dir, start readdir */ 456 int (*query_dir_first)(const unsigned int, struct cifs_tcon *, 457 const char *, struct cifs_sb_info *, 458 struct cifs_fid *, __u16, 459 struct cifs_search_info *); 460 /* continue readdir */ 461 int (*query_dir_next)(const unsigned int, struct cifs_tcon *, 462 struct cifs_fid *, 463 __u16, struct cifs_search_info *srch_inf); 464 /* close dir */ 465 int (*close_dir)(const unsigned int, struct cifs_tcon *, 466 struct cifs_fid *); 467 /* calculate a size of SMB message */ 468 unsigned int (*calc_smb_size)(void *buf); 469 /* check for STATUS_PENDING and process the response if yes */ 470 bool (*is_status_pending)(char *buf, struct TCP_Server_Info *server); 471 /* check for STATUS_NETWORK_SESSION_EXPIRED */ 472 bool (*is_session_expired)(char *); 473 /* send oplock break response */ 474 int (*oplock_response)(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid, 475 __u16 net_fid, struct cifsInodeInfo *cifs_inode); 476 /* query remote filesystem */ 477 int (*queryfs)(const unsigned int, struct cifs_tcon *, 478 struct cifs_sb_info *, struct kstatfs *); 479 /* send mandatory brlock to the server */ 480 int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64, 481 __u64, __u32, int, int, bool); 482 /* unlock range of mandatory locks */ 483 int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *, 484 const unsigned int); 485 /* push brlocks from the cache to the server */ 486 int (*push_mand_locks)(struct cifsFileInfo *); 487 /* get lease key of the inode */ 488 void (*get_lease_key)(struct inode *, struct cifs_fid *); 489 /* set lease key of the inode */ 490 void (*set_lease_key)(struct inode *, struct cifs_fid *); 491 /* generate new lease key */ 492 void (*new_lease_key)(struct cifs_fid *); 493 int (*generate_signingkey)(struct cifs_ses *ses, 494 struct TCP_Server_Info *server); 495 int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *, 496 bool allocate_crypto); 497 int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon, 498 struct cifsFileInfo *src_file); 499 int (*enum_snapshots)(const unsigned int xid, struct cifs_tcon *tcon, 500 struct cifsFileInfo *src_file, void __user *); 501 int (*notify)(const unsigned int xid, struct file *pfile, 502 void __user *pbuf, bool return_changes); 503 int (*query_mf_symlink)(unsigned int, struct cifs_tcon *, 504 struct cifs_sb_info *, const unsigned char *, 505 char *, unsigned int *); 506 int (*create_mf_symlink)(unsigned int, struct cifs_tcon *, 507 struct cifs_sb_info *, const unsigned char *, 508 char *, unsigned int *); 509 /* if we can do cache read operations */ 510 bool (*is_read_op)(__u32); 511 /* set oplock level for the inode */ 512 void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int, 513 bool *); 514 /* create lease context buffer for CREATE request */ 515 char * (*create_lease_buf)(u8 *lease_key, u8 oplock); 516 /* parse lease context buffer and return oplock/epoch info */ 517 __u8 (*parse_lease_buf)(void *buf, unsigned int *epoch, char *lkey); 518 ssize_t (*copychunk_range)(const unsigned int, 519 struct cifsFileInfo *src_file, 520 struct cifsFileInfo *target_file, 521 u64 src_off, u64 len, u64 dest_off); 522 int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src, 523 struct cifsFileInfo *target_file, u64 src_off, u64 len, 524 u64 dest_off); 525 int (*validate_negotiate)(const unsigned int, struct cifs_tcon *); 526 ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *, 527 const unsigned char *, const unsigned char *, char *, 528 size_t, struct cifs_sb_info *); 529 int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *, 530 const char *, const void *, const __u16, 531 const struct nls_table *, struct cifs_sb_info *); 532 struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *, 533 const char *, u32 *, u32); 534 struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *, 535 const struct cifs_fid *, u32 *, u32); 536 int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *, 537 int); 538 /* writepages retry size */ 539 unsigned int (*wp_retry_size)(struct inode *); 540 /* get mtu credits */ 541 int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int, 542 unsigned int *, struct cifs_credits *); 543 /* adjust previously taken mtu credits to request size */ 544 int (*adjust_credits)(struct TCP_Server_Info *server, 545 struct cifs_credits *credits, 546 const unsigned int payload_size); 547 /* check if we need to issue closedir */ 548 bool (*dir_needs_close)(struct cifsFileInfo *); 549 long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t, 550 loff_t); 551 /* init transform request - used for encryption for now */ 552 int (*init_transform_rq)(struct TCP_Server_Info *, int num_rqst, 553 struct smb_rqst *, struct smb_rqst *); 554 int (*is_transform_hdr)(void *buf); 555 int (*receive_transform)(struct TCP_Server_Info *, 556 struct mid_q_entry **, char **, int *); 557 enum securityEnum (*select_sectype)(struct TCP_Server_Info *, 558 enum securityEnum); 559 int (*next_header)(struct TCP_Server_Info *server, char *buf, 560 unsigned int *noff); 561 /* ioctl passthrough for query_info */ 562 int (*ioctl_query_info)(const unsigned int xid, 563 struct cifs_tcon *tcon, 564 struct cifs_sb_info *cifs_sb, 565 __le16 *path, int is_dir, 566 unsigned long p); 567 /* make unix special files (block, char, fifo, socket) */ 568 int (*make_node)(unsigned int xid, 569 struct inode *inode, 570 struct dentry *dentry, 571 struct cifs_tcon *tcon, 572 const char *full_path, 573 umode_t mode, 574 dev_t device_number); 575 /* version specific fiemap implementation */ 576 int (*fiemap)(struct cifs_tcon *tcon, struct cifsFileInfo *, 577 struct fiemap_extent_info *, u64, u64); 578 /* version specific llseek implementation */ 579 loff_t (*llseek)(struct file *, struct cifs_tcon *, loff_t, int); 580 /* Check for STATUS_IO_TIMEOUT */ 581 bool (*is_status_io_timeout)(char *buf); 582 /* Check for STATUS_NETWORK_NAME_DELETED */ 583 bool (*is_network_name_deleted)(char *buf, struct TCP_Server_Info *srv); 584 int (*parse_reparse_point)(struct cifs_sb_info *cifs_sb, 585 struct kvec *rsp_iov, 586 struct cifs_open_info_data *data); 587 int (*create_reparse_symlink)(const unsigned int xid, 588 struct inode *inode, 589 struct dentry *dentry, 590 struct cifs_tcon *tcon, 591 const char *full_path, 592 const char *symname); 593 }; 594 595 struct smb_version_values { 596 char *version_string; 597 __u16 protocol_id; 598 __u32 req_capabilities; 599 __u32 large_lock_type; 600 __u32 exclusive_lock_type; 601 __u32 shared_lock_type; 602 __u32 unlock_lock_type; 603 size_t header_preamble_size; 604 size_t header_size; 605 size_t max_header_size; 606 size_t read_rsp_size; 607 __le16 lock_cmd; 608 unsigned int cap_unix; 609 unsigned int cap_nt_find; 610 unsigned int cap_large_files; 611 __u16 signing_enabled; 612 __u16 signing_required; 613 size_t create_lease_size; 614 }; 615 616 #define HEADER_SIZE(server) (server->vals->header_size) 617 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size) 618 #define HEADER_PREAMBLE_SIZE(server) (server->vals->header_preamble_size) 619 #define MID_HEADER_SIZE(server) (HEADER_SIZE(server) - 1 - HEADER_PREAMBLE_SIZE(server)) 620 621 /** 622 * CIFS superblock mount flags (mnt_cifs_flags) to consider when 623 * trying to reuse existing superblock for a new mount 624 */ 625 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \ 626 CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \ 627 CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \ 628 CIFS_MOUNT_MAP_SFM_CHR | \ 629 CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \ 630 CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \ 631 CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \ 632 CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \ 633 CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \ 634 CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \ 635 CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID | \ 636 CIFS_MOUNT_UID_FROM_ACL | CIFS_MOUNT_NO_HANDLE_CACHE | \ 637 CIFS_MOUNT_NO_DFS | CIFS_MOUNT_MODE_FROM_SID | \ 638 CIFS_MOUNT_RO_CACHE | CIFS_MOUNT_RW_CACHE) 639 640 /** 641 * Generic VFS superblock mount flags (s_flags) to consider when 642 * trying to reuse existing superblock for a new mount 643 */ 644 #define CIFS_MS_MASK (SB_RDONLY | SB_MANDLOCK | SB_NOEXEC | SB_NOSUID | \ 645 SB_NODEV | SB_SYNCHRONOUS) 646 647 struct cifs_mnt_data { 648 struct cifs_sb_info *cifs_sb; 649 struct smb3_fs_context *ctx; 650 int flags; 651 }; 652 653 static inline unsigned int 654 get_rfc1002_length(void *buf) 655 { 656 return be32_to_cpu(*((__be32 *)buf)) & 0xffffff; 657 } 658 659 static inline void 660 inc_rfc1001_len(void *buf, int count) 661 { 662 be32_add_cpu((__be32 *)buf, count); 663 } 664 665 struct TCP_Server_Info { 666 struct list_head tcp_ses_list; 667 struct list_head smb_ses_list; 668 spinlock_t srv_lock; /* protect anything here that is not protected */ 669 __u64 conn_id; /* connection identifier (useful for debugging) */ 670 int srv_count; /* reference counter */ 671 /* 15 character server name + 0x20 16th byte indicating type = srv */ 672 char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 673 struct smb_version_operations *ops; 674 struct smb_version_values *vals; 675 /* updates to tcpStatus protected by cifs_tcp_ses_lock */ 676 enum statusEnum tcpStatus; /* what we think the status is */ 677 char *hostname; /* hostname portion of UNC string */ 678 struct socket *ssocket; 679 struct sockaddr_storage dstaddr; 680 struct sockaddr_storage srcaddr; /* locally bind to this IP */ 681 #ifdef CONFIG_NET_NS 682 struct net *net; 683 #endif 684 wait_queue_head_t response_q; 685 wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/ 686 spinlock_t mid_lock; /* protect mid queue and it's entries */ 687 struct list_head pending_mid_q; 688 bool noblocksnd; /* use blocking sendmsg */ 689 bool noautotune; /* do not autotune send buf sizes */ 690 bool nosharesock; 691 bool tcp_nodelay; 692 bool terminate; 693 unsigned int credits; /* send no more requests at once */ 694 unsigned int max_credits; /* can override large 32000 default at mnt */ 695 unsigned int in_flight; /* number of requests on the wire to server */ 696 unsigned int max_in_flight; /* max number of requests that were on wire */ 697 spinlock_t req_lock; /* protect the two values above */ 698 struct mutex _srv_mutex; 699 unsigned int nofs_flag; 700 struct task_struct *tsk; 701 char server_GUID[16]; 702 __u16 sec_mode; 703 bool sign; /* is signing enabled on this connection? */ 704 bool ignore_signature:1; /* skip validation of signatures in SMB2/3 rsp */ 705 bool session_estab; /* mark when very first sess is established */ 706 int echo_credits; /* echo reserved slots */ 707 int oplock_credits; /* oplock break reserved slots */ 708 bool echoes:1; /* enable echoes */ 709 __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */ 710 u16 dialect; /* dialect index that server chose */ 711 bool oplocks:1; /* enable oplocks */ 712 unsigned int maxReq; /* Clients should submit no more */ 713 /* than maxReq distinct unanswered SMBs to the server when using */ 714 /* multiplexed reads or writes (for SMB1/CIFS only, not SMB2/SMB3) */ 715 unsigned int maxBuf; /* maxBuf specifies the maximum */ 716 /* message size the server can send or receive for non-raw SMBs */ 717 /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */ 718 /* when socket is setup (and during reconnect) before NegProt sent */ 719 unsigned int max_rw; /* maxRw specifies the maximum */ 720 /* message size the server can send or receive for */ 721 /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */ 722 unsigned int capabilities; /* selective disabling of caps by smb sess */ 723 int timeAdj; /* Adjust for difference in server time zone in sec */ 724 __u64 CurrentMid; /* multiplex id - rotating counter, protected by GlobalMid_Lock */ 725 char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */ 726 /* 16th byte of RFC1001 workstation name is always null */ 727 char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL]; 728 __u32 sequence_number; /* for signing, protected by srv_mutex */ 729 __u32 reconnect_instance; /* incremented on each reconnect */ 730 struct session_key session_key; 731 unsigned long lstrp; /* when we got last response from this server */ 732 struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */ 733 #define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */ 734 #define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */ 735 char negflavor; /* NEGOTIATE response flavor */ 736 /* extended security flavors that server supports */ 737 bool sec_ntlmssp; /* supports NTLMSSP */ 738 bool sec_kerberosu2u; /* supports U2U Kerberos */ 739 bool sec_kerberos; /* supports plain Kerberos */ 740 bool sec_mskerberos; /* supports legacy MS Kerberos */ 741 bool large_buf; /* is current buffer large? */ 742 /* use SMBD connection instead of socket */ 743 bool rdma; 744 /* point to the SMBD connection if RDMA is used instead of socket */ 745 struct smbd_connection *smbd_conn; 746 struct delayed_work echo; /* echo ping workqueue job */ 747 char *smallbuf; /* pointer to current "small" buffer */ 748 char *bigbuf; /* pointer to current "big" buffer */ 749 /* Total size of this PDU. Only valid from cifs_demultiplex_thread */ 750 unsigned int pdu_size; 751 unsigned int total_read; /* total amount of data read in this pass */ 752 atomic_t in_send; /* requests trying to send */ 753 atomic_t num_waiters; /* blocked waiting to get in sendrecv */ 754 #ifdef CONFIG_CIFS_STATS2 755 atomic_t num_cmds[NUMBER_OF_SMB2_COMMANDS]; /* total requests by cmd */ 756 atomic_t smb2slowcmd[NUMBER_OF_SMB2_COMMANDS]; /* count resps > 1 sec */ 757 __u64 time_per_cmd[NUMBER_OF_SMB2_COMMANDS]; /* total time per cmd */ 758 __u32 slowest_cmd[NUMBER_OF_SMB2_COMMANDS]; 759 __u32 fastest_cmd[NUMBER_OF_SMB2_COMMANDS]; 760 #endif /* STATS2 */ 761 unsigned int max_read; 762 unsigned int max_write; 763 unsigned int min_offload; 764 unsigned int retrans; 765 __le16 compress_algorithm; 766 __u16 signing_algorithm; 767 __le16 cipher_type; 768 /* save initital negprot hash */ 769 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 770 bool signing_negotiated; /* true if valid signing context rcvd from server */ 771 bool posix_ext_supported; 772 struct delayed_work reconnect; /* reconnect workqueue job */ 773 struct mutex reconnect_mutex; /* prevent simultaneous reconnects */ 774 unsigned long echo_interval; 775 776 /* 777 * Number of targets available for reconnect. The more targets 778 * the more tasks have to wait to let the demultiplex thread 779 * reconnect. 780 */ 781 int nr_targets; 782 bool noblockcnt; /* use non-blocking connect() */ 783 784 /* 785 * If this is a session channel, 786 * primary_server holds the ref-counted 787 * pointer to primary channel connection for the session. 788 */ 789 #define SERVER_IS_CHAN(server) (!!(server)->primary_server) 790 struct TCP_Server_Info *primary_server; 791 __u16 channel_sequence_num; /* incremented on primary channel on each chan reconnect */ 792 793 #ifdef CONFIG_CIFS_SWN_UPCALL 794 bool use_swn_dstaddr; 795 struct sockaddr_storage swn_dstaddr; 796 #endif 797 struct mutex refpath_lock; /* protects leaf_fullpath */ 798 /* 799 * leaf_fullpath: Canonical DFS referral path related to this 800 * connection. 801 * It is used in DFS cache refresher, reconnect and may 802 * change due to nested DFS links. 803 * 804 * Protected by @refpath_lock and @srv_lock. The @refpath_lock is 805 * mostly used for not requiring a copy of @leaf_fullpath when getting 806 * cached or new DFS referrals (which might also sleep during I/O). 807 * While @srv_lock is held for making string and NULL comparions against 808 * both fields as in mount(2) and cache refresh. 809 * 810 * format: \\HOST\SHARE[\OPTIONAL PATH] 811 */ 812 char *leaf_fullpath; 813 }; 814 815 static inline bool is_smb1(struct TCP_Server_Info *server) 816 { 817 return HEADER_PREAMBLE_SIZE(server) != 0; 818 } 819 820 static inline void cifs_server_lock(struct TCP_Server_Info *server) 821 { 822 unsigned int nofs_flag = memalloc_nofs_save(); 823 824 mutex_lock(&server->_srv_mutex); 825 server->nofs_flag = nofs_flag; 826 } 827 828 static inline void cifs_server_unlock(struct TCP_Server_Info *server) 829 { 830 unsigned int nofs_flag = server->nofs_flag; 831 832 mutex_unlock(&server->_srv_mutex); 833 memalloc_nofs_restore(nofs_flag); 834 } 835 836 struct cifs_credits { 837 unsigned int value; 838 unsigned int instance; 839 }; 840 841 static inline unsigned int 842 in_flight(struct TCP_Server_Info *server) 843 { 844 unsigned int num; 845 846 spin_lock(&server->req_lock); 847 num = server->in_flight; 848 spin_unlock(&server->req_lock); 849 return num; 850 } 851 852 static inline bool 853 has_credits(struct TCP_Server_Info *server, int *credits, int num_credits) 854 { 855 int num; 856 857 spin_lock(&server->req_lock); 858 num = *credits; 859 spin_unlock(&server->req_lock); 860 return num >= num_credits; 861 } 862 863 static inline void 864 add_credits(struct TCP_Server_Info *server, const struct cifs_credits *credits, 865 const int optype) 866 { 867 server->ops->add_credits(server, credits, optype); 868 } 869 870 static inline void 871 add_credits_and_wake_if(struct TCP_Server_Info *server, 872 const struct cifs_credits *credits, const int optype) 873 { 874 if (credits->value) { 875 server->ops->add_credits(server, credits, optype); 876 wake_up(&server->request_q); 877 } 878 } 879 880 static inline void 881 set_credits(struct TCP_Server_Info *server, const int val) 882 { 883 server->ops->set_credits(server, val); 884 } 885 886 static inline int 887 adjust_credits(struct TCP_Server_Info *server, struct cifs_credits *credits, 888 const unsigned int payload_size) 889 { 890 return server->ops->adjust_credits ? 891 server->ops->adjust_credits(server, credits, payload_size) : 0; 892 } 893 894 static inline __le64 895 get_next_mid64(struct TCP_Server_Info *server) 896 { 897 return cpu_to_le64(server->ops->get_next_mid(server)); 898 } 899 900 static inline __le16 901 get_next_mid(struct TCP_Server_Info *server) 902 { 903 __u16 mid = server->ops->get_next_mid(server); 904 /* 905 * The value in the SMB header should be little endian for easy 906 * on-the-wire decoding. 907 */ 908 return cpu_to_le16(mid); 909 } 910 911 static inline void 912 revert_current_mid(struct TCP_Server_Info *server, const unsigned int val) 913 { 914 if (server->ops->revert_current_mid) 915 server->ops->revert_current_mid(server, val); 916 } 917 918 static inline void 919 revert_current_mid_from_hdr(struct TCP_Server_Info *server, 920 const struct smb2_hdr *shdr) 921 { 922 unsigned int num = le16_to_cpu(shdr->CreditCharge); 923 924 return revert_current_mid(server, num > 0 ? num : 1); 925 } 926 927 static inline __u16 928 get_mid(const struct smb_hdr *smb) 929 { 930 return le16_to_cpu(smb->Mid); 931 } 932 933 static inline bool 934 compare_mid(__u16 mid, const struct smb_hdr *smb) 935 { 936 return mid == le16_to_cpu(smb->Mid); 937 } 938 939 /* 940 * When the server supports very large reads and writes via POSIX extensions, 941 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not 942 * including the RFC1001 length. 943 * 944 * Note that this might make for "interesting" allocation problems during 945 * writeback however as we have to allocate an array of pointers for the 946 * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096. 947 * 948 * For reads, there is a similar problem as we need to allocate an array 949 * of kvecs to handle the receive, though that should only need to be done 950 * once. 951 */ 952 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4) 953 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4) 954 955 /* 956 * When the server doesn't allow large posix writes, only allow a rsize/wsize 957 * of 2^17-1 minus the size of the call header. That allows for a read or 958 * write up to the maximum size described by RFC1002. 959 */ 960 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4) 961 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4) 962 963 #define CIFS_DEFAULT_IOSIZE (1024 * 1024) 964 965 /* 966 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to 967 * those values when posix extensions aren't in force. In actuality here, we 968 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem 969 * to be ok with the extra byte even though Windows doesn't send writes that 970 * are that large. 971 * 972 * Citation: 973 * 974 * https://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx 975 */ 976 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024) 977 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536) 978 979 /* 980 * Macros to allow the TCP_Server_Info->net field and related code to drop out 981 * when CONFIG_NET_NS isn't set. 982 */ 983 984 #ifdef CONFIG_NET_NS 985 986 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 987 { 988 return srv->net; 989 } 990 991 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 992 { 993 srv->net = net; 994 } 995 996 #else 997 998 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv) 999 { 1000 return &init_net; 1001 } 1002 1003 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net) 1004 { 1005 } 1006 1007 #endif 1008 1009 struct cifs_server_iface { 1010 struct list_head iface_head; 1011 struct kref refcount; 1012 size_t speed; 1013 size_t weight_fulfilled; 1014 unsigned int num_channels; 1015 unsigned int rdma_capable : 1; 1016 unsigned int rss_capable : 1; 1017 unsigned int is_active : 1; /* unset if non existent */ 1018 struct sockaddr_storage sockaddr; 1019 }; 1020 1021 /* release iface when last ref is dropped */ 1022 static inline void 1023 release_iface(struct kref *ref) 1024 { 1025 struct cifs_server_iface *iface = container_of(ref, 1026 struct cifs_server_iface, 1027 refcount); 1028 kfree(iface); 1029 } 1030 1031 struct cifs_chan { 1032 unsigned int in_reconnect : 1; /* if session setup in progress for this channel */ 1033 struct TCP_Server_Info *server; 1034 struct cifs_server_iface *iface; /* interface in use */ 1035 __u8 signkey[SMB3_SIGN_KEY_SIZE]; 1036 }; 1037 1038 #define CIFS_SES_FLAG_SCALE_CHANNELS (0x1) 1039 1040 /* 1041 * Session structure. One of these for each uid session with a particular host 1042 */ 1043 struct cifs_ses { 1044 struct list_head smb_ses_list; 1045 struct list_head rlist; /* reconnect list */ 1046 struct list_head tcon_list; 1047 struct cifs_tcon *tcon_ipc; 1048 spinlock_t ses_lock; /* protect anything here that is not protected */ 1049 struct mutex session_mutex; 1050 struct TCP_Server_Info *server; /* pointer to server info */ 1051 int ses_count; /* reference counter */ 1052 enum ses_status_enum ses_status; /* updates protected by cifs_tcp_ses_lock */ 1053 unsigned int overrideSecFlg; /* if non-zero override global sec flags */ 1054 char *serverOS; /* name of operating system underlying server */ 1055 char *serverNOS; /* name of network operating system of server */ 1056 char *serverDomain; /* security realm of server */ 1057 __u64 Suid; /* remote smb uid */ 1058 kuid_t linux_uid; /* overriding owner of files on the mount */ 1059 kuid_t cred_uid; /* owner of credentials */ 1060 unsigned int capabilities; 1061 char ip_addr[INET6_ADDRSTRLEN + 1]; /* Max ipv6 (or v4) addr string len */ 1062 char *user_name; /* must not be null except during init of sess 1063 and after mount option parsing we fill it */ 1064 char *domainName; 1065 char *password; 1066 char *password2; /* When key rotation used, new password may be set before it expires */ 1067 char workstation_name[CIFS_MAX_WORKSTATION_LEN]; 1068 struct session_key auth_key; 1069 struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */ 1070 enum securityEnum sectype; /* what security flavor was specified? */ 1071 bool sign; /* is signing required? */ 1072 bool domainAuto:1; 1073 bool expired_pwd; /* track if access denied or expired pwd so can know if need to update */ 1074 unsigned int flags; 1075 __u16 session_flags; 1076 __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE]; 1077 __u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1078 __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE]; 1079 __u8 preauth_sha_hash[SMB2_PREAUTH_HASH_SIZE]; 1080 1081 /* 1082 * Network interfaces available on the server this session is 1083 * connected to. 1084 * 1085 * Other channels can be opened by connecting and binding this 1086 * session to interfaces from this list. 1087 * 1088 * iface_lock should be taken when accessing any of these fields 1089 */ 1090 spinlock_t iface_lock; 1091 /* ========= begin: protected by iface_lock ======== */ 1092 struct list_head iface_list; 1093 size_t iface_count; 1094 unsigned long iface_last_update; /* jiffies */ 1095 /* ========= end: protected by iface_lock ======== */ 1096 1097 spinlock_t chan_lock; 1098 /* ========= begin: protected by chan_lock ======== */ 1099 #define CIFS_MAX_CHANNELS 16 1100 #define CIFS_INVAL_CHAN_INDEX (-1) 1101 #define CIFS_ALL_CHANNELS_SET(ses) \ 1102 ((1UL << (ses)->chan_count) - 1) 1103 #define CIFS_ALL_CHANS_GOOD(ses) \ 1104 (!(ses)->chans_need_reconnect) 1105 #define CIFS_ALL_CHANS_NEED_RECONNECT(ses) \ 1106 ((ses)->chans_need_reconnect == CIFS_ALL_CHANNELS_SET(ses)) 1107 #define CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses) \ 1108 ((ses)->chans_need_reconnect = CIFS_ALL_CHANNELS_SET(ses)) 1109 #define CIFS_CHAN_NEEDS_RECONNECT(ses, index) \ 1110 test_bit((index), &(ses)->chans_need_reconnect) 1111 #define CIFS_CHAN_IN_RECONNECT(ses, index) \ 1112 ((ses)->chans[(index)].in_reconnect) 1113 1114 struct cifs_chan chans[CIFS_MAX_CHANNELS]; 1115 size_t chan_count; 1116 size_t chan_max; 1117 atomic_t chan_seq; /* round robin state */ 1118 1119 /* 1120 * chans_need_reconnect is a bitmap indicating which of the channels 1121 * under this smb session needs to be reconnected. 1122 * If not multichannel session, only one bit will be used. 1123 * 1124 * We will ask for sess and tcon reconnection only if all the 1125 * channels are marked for needing reconnection. This will 1126 * enable the sessions on top to continue to live till any 1127 * of the channels below are active. 1128 */ 1129 unsigned long chans_need_reconnect; 1130 /* ========= end: protected by chan_lock ======== */ 1131 struct cifs_ses *dfs_root_ses; 1132 struct nls_table *local_nls; 1133 }; 1134 1135 static inline bool 1136 cap_unix(struct cifs_ses *ses) 1137 { 1138 return ses->server->vals->cap_unix & ses->capabilities; 1139 } 1140 1141 /* 1142 * common struct for holding inode info when searching for or updating an 1143 * inode with new info 1144 */ 1145 1146 #define CIFS_FATTR_JUNCTION 0x1 1147 #define CIFS_FATTR_DELETE_PENDING 0x2 1148 #define CIFS_FATTR_NEED_REVAL 0x4 1149 #define CIFS_FATTR_INO_COLLISION 0x8 1150 #define CIFS_FATTR_UNKNOWN_NLINK 0x10 1151 #define CIFS_FATTR_FAKE_ROOT_INO 0x20 1152 1153 struct cifs_fattr { 1154 u32 cf_flags; 1155 u32 cf_cifsattrs; 1156 u64 cf_uniqueid; 1157 u64 cf_eof; 1158 u64 cf_bytes; 1159 u64 cf_createtime; 1160 kuid_t cf_uid; 1161 kgid_t cf_gid; 1162 umode_t cf_mode; 1163 dev_t cf_rdev; 1164 unsigned int cf_nlink; 1165 unsigned int cf_dtype; 1166 struct timespec64 cf_atime; 1167 struct timespec64 cf_mtime; 1168 struct timespec64 cf_ctime; 1169 u32 cf_cifstag; 1170 char *cf_symlink_target; 1171 }; 1172 1173 /* 1174 * there is one of these for each connection to a resource on a particular 1175 * session 1176 */ 1177 struct cifs_tcon { 1178 struct list_head tcon_list; 1179 int tc_count; 1180 struct list_head rlist; /* reconnect list */ 1181 spinlock_t tc_lock; /* protect anything here that is not protected */ 1182 atomic_t num_local_opens; /* num of all opens including disconnected */ 1183 atomic_t num_remote_opens; /* num of all network opens on server */ 1184 struct list_head openFileList; 1185 spinlock_t open_file_lock; /* protects list above */ 1186 struct cifs_ses *ses; /* pointer to session associated with */ 1187 char tree_name[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */ 1188 char *nativeFileSystem; 1189 char *password; /* for share-level security */ 1190 __u32 tid; /* The 4 byte tree id */ 1191 __u16 Flags; /* optional support bits */ 1192 enum tid_status_enum status; 1193 atomic_t num_smbs_sent; 1194 union { 1195 struct { 1196 atomic_t num_writes; 1197 atomic_t num_reads; 1198 atomic_t num_flushes; 1199 atomic_t num_oplock_brks; 1200 atomic_t num_opens; 1201 atomic_t num_closes; 1202 atomic_t num_deletes; 1203 atomic_t num_mkdirs; 1204 atomic_t num_posixopens; 1205 atomic_t num_posixmkdirs; 1206 atomic_t num_rmdirs; 1207 atomic_t num_renames; 1208 atomic_t num_t2renames; 1209 atomic_t num_ffirst; 1210 atomic_t num_fnext; 1211 atomic_t num_fclose; 1212 atomic_t num_hardlinks; 1213 atomic_t num_symlinks; 1214 atomic_t num_locks; 1215 atomic_t num_acl_get; 1216 atomic_t num_acl_set; 1217 } cifs_stats; 1218 struct { 1219 atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS]; 1220 atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS]; 1221 } smb2_stats; 1222 } stats; 1223 __u64 bytes_read; 1224 __u64 bytes_written; 1225 spinlock_t stat_lock; /* protects the two fields above */ 1226 time64_t stats_from_time; 1227 FILE_SYSTEM_DEVICE_INFO fsDevInfo; 1228 FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */ 1229 FILE_SYSTEM_UNIX_INFO fsUnixInfo; 1230 bool ipc:1; /* set if connection to IPC$ share (always also pipe) */ 1231 bool pipe:1; /* set if connection to pipe share */ 1232 bool print:1; /* set if connection to printer share */ 1233 bool retry:1; 1234 bool nocase:1; 1235 bool nohandlecache:1; /* if strange server resource prob can turn off */ 1236 bool nodelete:1; 1237 bool seal:1; /* transport encryption for this mounted share */ 1238 bool unix_ext:1; /* if false disable Linux extensions to CIFS protocol 1239 for this mount even if server would support */ 1240 bool posix_extensions; /* if true SMB3.11 posix extensions enabled */ 1241 bool local_lease:1; /* check leases (only) on local system not remote */ 1242 bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ 1243 bool broken_sparse_sup; /* if server or share does not support sparse */ 1244 bool need_reconnect:1; /* connection reset, tid now invalid */ 1245 bool need_reopen_files:1; /* need to reopen tcon file handles */ 1246 bool use_resilient:1; /* use resilient instead of durable handles */ 1247 bool use_persistent:1; /* use persistent instead of durable handles */ 1248 bool no_lease:1; /* Do not request leases on files or directories */ 1249 bool use_witness:1; /* use witness protocol */ 1250 __le32 capabilities; 1251 __u32 share_flags; 1252 __u32 maximal_access; 1253 __u32 vol_serial_number; 1254 __le64 vol_create_time; 1255 __u64 snapshot_time; /* for timewarp tokens - timestamp of snapshot */ 1256 __u32 handle_timeout; /* persistent and durable handle timeout in ms */ 1257 __u32 ss_flags; /* sector size flags */ 1258 __u32 perf_sector_size; /* best sector size for perf */ 1259 __u32 max_chunks; 1260 __u32 max_bytes_chunk; 1261 __u32 max_bytes_copy; 1262 __u32 max_cached_dirs; 1263 #ifdef CONFIG_CIFS_FSCACHE 1264 u64 resource_id; /* server resource id */ 1265 bool fscache_acquired; /* T if we've tried acquiring a cookie */ 1266 struct fscache_volume *fscache; /* cookie for share */ 1267 struct mutex fscache_lock; /* Prevent regetting a cookie */ 1268 #endif 1269 struct list_head pending_opens; /* list of incomplete opens */ 1270 struct cached_fids *cfids; 1271 /* BB add field for back pointer to sb struct(s)? */ 1272 #ifdef CONFIG_CIFS_DFS_UPCALL 1273 struct delayed_work dfs_cache_work; 1274 #endif 1275 struct delayed_work query_interfaces; /* query interfaces workqueue job */ 1276 char *origin_fullpath; /* canonical copy of smb3_fs_context::source */ 1277 }; 1278 1279 /* 1280 * This is a refcounted and timestamped container for a tcon pointer. The 1281 * container holds a tcon reference. It is considered safe to free one of 1282 * these when the tl_count goes to 0. The tl_time is the time of the last 1283 * "get" on the container. 1284 */ 1285 struct tcon_link { 1286 struct rb_node tl_rbnode; 1287 kuid_t tl_uid; 1288 unsigned long tl_flags; 1289 #define TCON_LINK_MASTER 0 1290 #define TCON_LINK_PENDING 1 1291 #define TCON_LINK_IN_TREE 2 1292 unsigned long tl_time; 1293 atomic_t tl_count; 1294 struct cifs_tcon *tl_tcon; 1295 }; 1296 1297 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb); 1298 extern void smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst); 1299 1300 static inline struct cifs_tcon * 1301 tlink_tcon(struct tcon_link *tlink) 1302 { 1303 return tlink->tl_tcon; 1304 } 1305 1306 static inline struct tcon_link * 1307 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) 1308 { 1309 return cifs_sb->master_tlink; 1310 } 1311 1312 extern void cifs_put_tlink(struct tcon_link *tlink); 1313 1314 static inline struct tcon_link * 1315 cifs_get_tlink(struct tcon_link *tlink) 1316 { 1317 if (tlink && !IS_ERR(tlink)) 1318 atomic_inc(&tlink->tl_count); 1319 return tlink; 1320 } 1321 1322 /* This function is always expected to succeed */ 1323 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb); 1324 1325 #define CIFS_OPLOCK_NO_CHANGE 0xfe 1326 1327 struct cifs_pending_open { 1328 struct list_head olist; 1329 struct tcon_link *tlink; 1330 __u8 lease_key[16]; 1331 __u32 oplock; 1332 }; 1333 1334 struct cifs_deferred_close { 1335 struct list_head dlist; 1336 struct tcon_link *tlink; 1337 __u16 netfid; 1338 __u64 persistent_fid; 1339 __u64 volatile_fid; 1340 }; 1341 1342 /* 1343 * This info hangs off the cifsFileInfo structure, pointed to by llist. 1344 * This is used to track byte stream locks on the file 1345 */ 1346 struct cifsLockInfo { 1347 struct list_head llist; /* pointer to next cifsLockInfo */ 1348 struct list_head blist; /* pointer to locks blocked on this */ 1349 wait_queue_head_t block_q; 1350 __u64 offset; 1351 __u64 length; 1352 __u32 pid; 1353 __u16 type; 1354 __u16 flags; 1355 }; 1356 1357 /* 1358 * One of these for each open instance of a file 1359 */ 1360 struct cifs_search_info { 1361 loff_t index_of_last_entry; 1362 __u16 entries_in_buffer; 1363 __u16 info_level; 1364 __u32 resume_key; 1365 char *ntwrk_buf_start; 1366 char *srch_entries_start; 1367 char *last_entry; 1368 const char *presume_name; 1369 unsigned int resume_name_len; 1370 bool endOfSearch:1; 1371 bool emptyDir:1; 1372 bool unicode:1; 1373 bool smallBuf:1; /* so we know which buf_release function to call */ 1374 }; 1375 1376 #define ACL_NO_MODE ((umode_t)(-1)) 1377 struct cifs_open_parms { 1378 struct cifs_tcon *tcon; 1379 struct cifs_sb_info *cifs_sb; 1380 int disposition; 1381 int desired_access; 1382 int create_options; 1383 const char *path; 1384 struct cifs_fid *fid; 1385 umode_t mode; 1386 bool reconnect:1; 1387 bool replay:1; /* indicates that this open is for a replay */ 1388 }; 1389 1390 struct cifs_fid { 1391 __u16 netfid; 1392 __u64 persistent_fid; /* persist file id for smb2 */ 1393 __u64 volatile_fid; /* volatile file id for smb2 */ 1394 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */ 1395 __u8 create_guid[16]; 1396 __u32 access; 1397 struct cifs_pending_open *pending_open; 1398 unsigned int epoch; 1399 #ifdef CONFIG_CIFS_DEBUG2 1400 __u64 mid; 1401 #endif /* CIFS_DEBUG2 */ 1402 bool purge_cache; 1403 }; 1404 1405 struct cifs_fid_locks { 1406 struct list_head llist; 1407 struct cifsFileInfo *cfile; /* fid that owns locks */ 1408 struct list_head locks; /* locks held by fid above */ 1409 }; 1410 1411 struct cifsFileInfo { 1412 /* following two lists are protected by tcon->open_file_lock */ 1413 struct list_head tlist; /* pointer to next fid owned by tcon */ 1414 struct list_head flist; /* next fid (file instance) for this inode */ 1415 /* lock list below protected by cifsi->lock_sem */ 1416 struct cifs_fid_locks *llist; /* brlocks held by this fid */ 1417 kuid_t uid; /* allows finding which FileInfo structure */ 1418 __u32 pid; /* process id who opened file */ 1419 struct cifs_fid fid; /* file id from remote */ 1420 struct list_head rlist; /* reconnect list */ 1421 /* BB add lock scope info here if needed */ 1422 /* lock scope id (0 if none) */ 1423 struct dentry *dentry; 1424 struct tcon_link *tlink; 1425 unsigned int f_flags; 1426 bool invalidHandle:1; /* file closed via session abend */ 1427 bool swapfile:1; 1428 bool oplock_break_cancelled:1; 1429 bool offload:1; /* offload final part of _put to a wq */ 1430 unsigned int oplock_epoch; /* epoch from the lease break */ 1431 __u32 oplock_level; /* oplock/lease level from the lease break */ 1432 int count; 1433 spinlock_t file_info_lock; /* protects four flag/count fields above */ 1434 struct mutex fh_mutex; /* prevents reopen race after dead ses*/ 1435 struct cifs_search_info srch_inf; 1436 struct work_struct oplock_break; /* work for oplock breaks */ 1437 struct work_struct put; /* work for the final part of _put */ 1438 struct work_struct serverclose; /* work for serverclose */ 1439 struct delayed_work deferred; 1440 bool deferred_close_scheduled; /* Flag to indicate close is scheduled */ 1441 char *symlink_target; 1442 }; 1443 1444 struct cifs_io_parms { 1445 __u16 netfid; 1446 __u64 persistent_fid; /* persist file id for smb2 */ 1447 __u64 volatile_fid; /* volatile file id for smb2 */ 1448 __u32 pid; 1449 __u64 offset; 1450 unsigned int length; 1451 struct cifs_tcon *tcon; 1452 struct TCP_Server_Info *server; 1453 }; 1454 1455 struct cifs_aio_ctx { 1456 struct kref refcount; 1457 struct list_head list; 1458 struct mutex aio_mutex; 1459 struct completion done; 1460 struct iov_iter iter; 1461 struct kiocb *iocb; 1462 struct cifsFileInfo *cfile; 1463 struct bio_vec *bv; 1464 loff_t pos; 1465 unsigned int nr_pinned_pages; 1466 ssize_t rc; 1467 unsigned int len; 1468 unsigned int total_len; 1469 unsigned int bv_need_unpin; /* If ->bv[] needs unpinning */ 1470 bool should_dirty; 1471 /* 1472 * Indicates if this aio_ctx is for direct_io, 1473 * If yes, iter is a copy of the user passed iov_iter 1474 */ 1475 bool direct_io; 1476 }; 1477 1478 /* asynchronous read support */ 1479 struct cifs_readdata { 1480 struct kref refcount; 1481 struct list_head list; 1482 struct completion done; 1483 struct cifsFileInfo *cfile; 1484 struct address_space *mapping; 1485 struct cifs_aio_ctx *ctx; 1486 __u64 offset; 1487 ssize_t got_bytes; 1488 unsigned int bytes; 1489 pid_t pid; 1490 int result; 1491 struct work_struct work; 1492 struct iov_iter iter; 1493 struct kvec iov[2]; 1494 struct TCP_Server_Info *server; 1495 #ifdef CONFIG_CIFS_SMB_DIRECT 1496 struct smbd_mr *mr; 1497 #endif 1498 struct cifs_credits credits; 1499 }; 1500 1501 /* asynchronous write support */ 1502 struct cifs_writedata { 1503 struct kref refcount; 1504 struct list_head list; 1505 struct completion done; 1506 enum writeback_sync_modes sync_mode; 1507 struct work_struct work; 1508 struct cifsFileInfo *cfile; 1509 struct cifs_aio_ctx *ctx; 1510 struct iov_iter iter; 1511 struct bio_vec *bv; 1512 __u64 offset; 1513 pid_t pid; 1514 unsigned int bytes; 1515 int result; 1516 struct TCP_Server_Info *server; 1517 #ifdef CONFIG_CIFS_SMB_DIRECT 1518 struct smbd_mr *mr; 1519 #endif 1520 struct cifs_credits credits; 1521 bool replay; 1522 }; 1523 1524 /* 1525 * Take a reference on the file private data. Must be called with 1526 * cfile->file_info_lock held. 1527 */ 1528 static inline void 1529 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file) 1530 { 1531 ++cifs_file->count; 1532 } 1533 1534 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file); 1535 void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, bool wait_oplock_hdlr, 1536 bool offload); 1537 void cifsFileInfo_put(struct cifsFileInfo *cifs_file); 1538 1539 #define CIFS_CACHE_READ_FLG 1 1540 #define CIFS_CACHE_HANDLE_FLG 2 1541 #define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG) 1542 #define CIFS_CACHE_WRITE_FLG 4 1543 #define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG) 1544 #define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG) 1545 1546 #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)) 1547 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG) 1548 #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)) 1549 1550 /* 1551 * One of these for each file inode 1552 */ 1553 1554 struct cifsInodeInfo { 1555 struct netfs_inode netfs; /* Netfslib context and vfs inode */ 1556 bool can_cache_brlcks; 1557 struct list_head llist; /* locks helb by this inode */ 1558 /* 1559 * NOTE: Some code paths call down_read(lock_sem) twice, so 1560 * we must always use cifs_down_write() instead of down_write() 1561 * for this semaphore to avoid deadlocks. 1562 */ 1563 struct rw_semaphore lock_sem; /* protect the fields above */ 1564 /* BB add in lists for dirty pages i.e. write caching info for oplock */ 1565 struct list_head openFileList; 1566 spinlock_t open_file_lock; /* protects openFileList */ 1567 __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */ 1568 unsigned int oplock; /* oplock/lease level we have */ 1569 unsigned int epoch; /* used to track lease state changes */ 1570 #define CIFS_INODE_PENDING_OPLOCK_BREAK (0) /* oplock break in progress */ 1571 #define CIFS_INODE_PENDING_WRITERS (1) /* Writes in progress */ 1572 #define CIFS_INODE_FLAG_UNUSED (2) /* Unused flag */ 1573 #define CIFS_INO_DELETE_PENDING (3) /* delete pending on server */ 1574 #define CIFS_INO_INVALID_MAPPING (4) /* pagecache is invalid */ 1575 #define CIFS_INO_LOCK (5) /* lock bit for synchronization */ 1576 #define CIFS_INO_MODIFIED_ATTR (6) /* Indicate change in mtime/ctime */ 1577 #define CIFS_INO_CLOSE_ON_LOCK (7) /* Not to defer the close when lock is set */ 1578 unsigned long flags; 1579 spinlock_t writers_lock; 1580 unsigned int writers; /* Number of writers on this inode */ 1581 unsigned long time; /* jiffies of last update of inode */ 1582 u64 server_eof; /* current file size on server -- protected by i_lock */ 1583 u64 uniqueid; /* server inode number */ 1584 u64 createtime; /* creation time on server */ 1585 __u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for this inode */ 1586 struct list_head deferred_closes; /* list of deferred closes */ 1587 spinlock_t deferred_lock; /* protection on deferred list */ 1588 bool lease_granted; /* Flag to indicate whether lease or oplock is granted. */ 1589 char *symlink_target; 1590 __u32 reparse_tag; 1591 }; 1592 1593 static inline struct cifsInodeInfo * 1594 CIFS_I(struct inode *inode) 1595 { 1596 return container_of(inode, struct cifsInodeInfo, netfs.inode); 1597 } 1598 1599 static inline struct cifs_sb_info * 1600 CIFS_SB(struct super_block *sb) 1601 { 1602 return sb->s_fs_info; 1603 } 1604 1605 static inline struct cifs_sb_info * 1606 CIFS_FILE_SB(struct file *file) 1607 { 1608 return CIFS_SB(file_inode(file)->i_sb); 1609 } 1610 1611 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb) 1612 { 1613 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) 1614 return '/'; 1615 else 1616 return '\\'; 1617 } 1618 1619 static inline void 1620 convert_delimiter(char *path, char delim) 1621 { 1622 char old_delim, *pos; 1623 1624 if (delim == '/') 1625 old_delim = '\\'; 1626 else 1627 old_delim = '/'; 1628 1629 pos = path; 1630 while ((pos = strchr(pos, old_delim))) 1631 *pos = delim; 1632 } 1633 1634 #define cifs_stats_inc atomic_inc 1635 1636 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon, 1637 unsigned int bytes) 1638 { 1639 if (bytes) { 1640 spin_lock(&tcon->stat_lock); 1641 tcon->bytes_written += bytes; 1642 spin_unlock(&tcon->stat_lock); 1643 } 1644 } 1645 1646 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon, 1647 unsigned int bytes) 1648 { 1649 spin_lock(&tcon->stat_lock); 1650 tcon->bytes_read += bytes; 1651 spin_unlock(&tcon->stat_lock); 1652 } 1653 1654 1655 /* 1656 * This is the prototype for the mid receive function. This function is for 1657 * receiving the rest of the SMB frame, starting with the WordCount (which is 1658 * just after the MID in struct smb_hdr). Note: 1659 * 1660 * - This will be called by cifsd, with no locks held. 1661 * - The mid will still be on the pending_mid_q. 1662 * - mid->resp_buf will point to the current buffer. 1663 * 1664 * Returns zero on a successful receive, or an error. The receive state in 1665 * the TCP_Server_Info will also be updated. 1666 */ 1667 typedef int (mid_receive_t)(struct TCP_Server_Info *server, 1668 struct mid_q_entry *mid); 1669 1670 /* 1671 * This is the prototype for the mid callback function. This is called once the 1672 * mid has been received off of the socket. When creating one, take special 1673 * care to avoid deadlocks. Things to bear in mind: 1674 * 1675 * - it will be called by cifsd, with no locks held 1676 * - the mid will be removed from any lists 1677 */ 1678 typedef void (mid_callback_t)(struct mid_q_entry *mid); 1679 1680 /* 1681 * This is the protopyte for mid handle function. This is called once the mid 1682 * has been recognized after decryption of the message. 1683 */ 1684 typedef int (mid_handle_t)(struct TCP_Server_Info *server, 1685 struct mid_q_entry *mid); 1686 1687 /* one of these for every pending CIFS request to the server */ 1688 struct mid_q_entry { 1689 struct list_head qhead; /* mids waiting on reply from this server */ 1690 struct kref refcount; 1691 struct TCP_Server_Info *server; /* server corresponding to this mid */ 1692 __u64 mid; /* multiplex id */ 1693 __u16 credits; /* number of credits consumed by this mid */ 1694 __u16 credits_received; /* number of credits from the response */ 1695 __u32 pid; /* process id */ 1696 __u32 sequence_number; /* for CIFS signing */ 1697 unsigned long when_alloc; /* when mid was created */ 1698 #ifdef CONFIG_CIFS_STATS2 1699 unsigned long when_sent; /* time when smb send finished */ 1700 unsigned long when_received; /* when demux complete (taken off wire) */ 1701 #endif 1702 mid_receive_t *receive; /* call receive callback */ 1703 mid_callback_t *callback; /* call completion callback */ 1704 mid_handle_t *handle; /* call handle mid callback */ 1705 void *callback_data; /* general purpose pointer for callback */ 1706 struct task_struct *creator; 1707 void *resp_buf; /* pointer to received SMB header */ 1708 unsigned int resp_buf_size; 1709 int mid_state; /* wish this were enum but can not pass to wait_event */ 1710 unsigned int mid_flags; 1711 __le16 command; /* smb command code */ 1712 unsigned int optype; /* operation type */ 1713 bool large_buf:1; /* if valid response, is pointer to large buf */ 1714 bool multiRsp:1; /* multiple trans2 responses for one request */ 1715 bool multiEnd:1; /* both received */ 1716 bool decrypted:1; /* decrypted entry */ 1717 }; 1718 1719 struct close_cancelled_open { 1720 struct cifs_fid fid; 1721 struct cifs_tcon *tcon; 1722 struct work_struct work; 1723 __u64 mid; 1724 __u16 cmd; 1725 }; 1726 1727 /* Make code in transport.c a little cleaner by moving 1728 update of optional stats into function below */ 1729 static inline void cifs_in_send_inc(struct TCP_Server_Info *server) 1730 { 1731 atomic_inc(&server->in_send); 1732 } 1733 1734 static inline void cifs_in_send_dec(struct TCP_Server_Info *server) 1735 { 1736 atomic_dec(&server->in_send); 1737 } 1738 1739 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server) 1740 { 1741 atomic_inc(&server->num_waiters); 1742 } 1743 1744 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server) 1745 { 1746 atomic_dec(&server->num_waiters); 1747 } 1748 1749 #ifdef CONFIG_CIFS_STATS2 1750 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1751 { 1752 mid->when_sent = jiffies; 1753 } 1754 #else 1755 static inline void cifs_save_when_sent(struct mid_q_entry *mid) 1756 { 1757 } 1758 #endif 1759 1760 /* for pending dnotify requests */ 1761 struct dir_notify_req { 1762 struct list_head lhead; 1763 __le16 Pid; 1764 __le16 PidHigh; 1765 __u16 Mid; 1766 __u16 Tid; 1767 __u16 Uid; 1768 __u16 netfid; 1769 __u32 filter; /* CompletionFilter (for multishot) */ 1770 int multishot; 1771 struct file *pfile; 1772 }; 1773 1774 struct dfs_info3_param { 1775 int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/ 1776 int path_consumed; 1777 int server_type; 1778 int ref_flag; 1779 char *path_name; 1780 char *node_name; 1781 int ttl; 1782 }; 1783 1784 struct file_list { 1785 struct list_head list; 1786 struct cifsFileInfo *cfile; 1787 }; 1788 1789 struct cifs_mount_ctx { 1790 struct cifs_sb_info *cifs_sb; 1791 struct smb3_fs_context *fs_ctx; 1792 unsigned int xid; 1793 struct TCP_Server_Info *server; 1794 struct cifs_ses *ses; 1795 struct cifs_tcon *tcon; 1796 }; 1797 1798 static inline void __free_dfs_info_param(struct dfs_info3_param *param) 1799 { 1800 kfree(param->path_name); 1801 kfree(param->node_name); 1802 } 1803 1804 static inline void free_dfs_info_param(struct dfs_info3_param *param) 1805 { 1806 if (param) 1807 __free_dfs_info_param(param); 1808 } 1809 1810 static inline void zfree_dfs_info_param(struct dfs_info3_param *param) 1811 { 1812 if (param) { 1813 __free_dfs_info_param(param); 1814 memset(param, 0, sizeof(*param)); 1815 } 1816 } 1817 1818 static inline void free_dfs_info_array(struct dfs_info3_param *param, 1819 int number_of_items) 1820 { 1821 int i; 1822 1823 if ((number_of_items == 0) || (param == NULL)) 1824 return; 1825 for (i = 0; i < number_of_items; i++) { 1826 kfree(param[i].path_name); 1827 kfree(param[i].node_name); 1828 } 1829 kfree(param); 1830 } 1831 1832 static inline bool is_interrupt_error(int error) 1833 { 1834 switch (error) { 1835 case -EINTR: 1836 case -ERESTARTSYS: 1837 case -ERESTARTNOHAND: 1838 case -ERESTARTNOINTR: 1839 return true; 1840 } 1841 return false; 1842 } 1843 1844 static inline bool is_retryable_error(int error) 1845 { 1846 if (is_interrupt_error(error) || error == -EAGAIN) 1847 return true; 1848 return false; 1849 } 1850 1851 static inline bool is_replayable_error(int error) 1852 { 1853 if (error == -EAGAIN || error == -ECONNABORTED) 1854 return true; 1855 return false; 1856 } 1857 1858 1859 /* cifs_get_writable_file() flags */ 1860 #define FIND_WR_ANY 0 1861 #define FIND_WR_FSUID_ONLY 1 1862 #define FIND_WR_WITH_DELETE 2 1863 1864 #define MID_FREE 0 1865 #define MID_REQUEST_ALLOCATED 1 1866 #define MID_REQUEST_SUBMITTED 2 1867 #define MID_RESPONSE_RECEIVED 4 1868 #define MID_RETRY_NEEDED 8 /* session closed while this request out */ 1869 #define MID_RESPONSE_MALFORMED 0x10 1870 #define MID_SHUTDOWN 0x20 1871 #define MID_RESPONSE_READY 0x40 /* ready for other process handle the rsp */ 1872 1873 /* Flags */ 1874 #define MID_WAIT_CANCELLED 1 /* Cancelled while waiting for response */ 1875 #define MID_DELETED 2 /* Mid has been dequeued/deleted */ 1876 1877 /* Types of response buffer returned from SendReceive2 */ 1878 #define CIFS_NO_BUFFER 0 /* Response buffer not returned */ 1879 #define CIFS_SMALL_BUFFER 1 1880 #define CIFS_LARGE_BUFFER 2 1881 #define CIFS_IOVEC 4 /* array of response buffers */ 1882 1883 /* Type of Request to SendReceive2 */ 1884 #define CIFS_BLOCKING_OP 1 /* operation can block */ 1885 #define CIFS_NON_BLOCKING 2 /* do not block waiting for credits */ 1886 #define CIFS_TIMEOUT_MASK 0x003 /* only one of above set in req */ 1887 #define CIFS_LOG_ERROR 0x010 /* log NT STATUS if non-zero */ 1888 #define CIFS_LARGE_BUF_OP 0x020 /* large request buffer */ 1889 #define CIFS_NO_RSP_BUF 0x040 /* no response buffer required */ 1890 1891 /* Type of request operation */ 1892 #define CIFS_ECHO_OP 0x080 /* echo request */ 1893 #define CIFS_OBREAK_OP 0x0100 /* oplock break request */ 1894 #define CIFS_NEG_OP 0x0200 /* negotiate request */ 1895 #define CIFS_CP_CREATE_CLOSE_OP 0x0400 /* compound create+close request */ 1896 /* Lower bitmask values are reserved by others below. */ 1897 #define CIFS_SESS_OP 0x2000 /* session setup request */ 1898 #define CIFS_OP_MASK 0x2780 /* mask request type */ 1899 1900 #define CIFS_HAS_CREDITS 0x0400 /* already has credits */ 1901 #define CIFS_TRANSFORM_REQ 0x0800 /* transform request before sending */ 1902 #define CIFS_NO_SRV_RSP 0x1000 /* there is no server response */ 1903 1904 /* Security Flags: indicate type of session setup needed */ 1905 #define CIFSSEC_MAY_SIGN 0x00001 1906 #define CIFSSEC_MAY_NTLMV2 0x00004 1907 #define CIFSSEC_MAY_KRB5 0x00008 1908 #define CIFSSEC_MAY_SEAL 0x00040 /* not supported yet */ 1909 #define CIFSSEC_MAY_NTLMSSP 0x00080 /* raw ntlmssp with ntlmv2 */ 1910 1911 #define CIFSSEC_MUST_SIGN 0x01001 1912 /* note that only one of the following can be set so the 1913 result of setting MUST flags more than once will be to 1914 require use of the stronger protocol */ 1915 #define CIFSSEC_MUST_NTLMV2 0x04004 1916 #define CIFSSEC_MUST_KRB5 0x08008 1917 #ifdef CONFIG_CIFS_UPCALL 1918 #define CIFSSEC_MASK 0x8F08F /* flags supported if no weak allowed */ 1919 #else 1920 #define CIFSSEC_MASK 0x87087 /* flags supported if no weak allowed */ 1921 #endif /* UPCALL */ 1922 #define CIFSSEC_MUST_SEAL 0x40040 /* not supported yet */ 1923 #define CIFSSEC_MUST_NTLMSSP 0x80080 /* raw ntlmssp with ntlmv2 */ 1924 1925 #define CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP) 1926 #define CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2) 1927 #define CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP) 1928 /* 1929 ***************************************************************** 1930 * All constants go here 1931 ***************************************************************** 1932 */ 1933 1934 #define UID_HASH (16) 1935 1936 /* 1937 * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the 1938 * following to be declared. 1939 */ 1940 1941 /**************************************************************************** 1942 * Here are all the locks (spinlock, mutex, semaphore) in cifs.ko, arranged according 1943 * to the locking order. i.e. if two locks are to be held together, the lock that 1944 * appears higher in this list needs to be taken before the other. 1945 * 1946 * If you hold a lock that is lower in this list, and you need to take a higher lock 1947 * (or if you think that one of the functions that you're calling may need to), first 1948 * drop the lock you hold, pick up the higher lock, then the lower one. This will 1949 * ensure that locks are picked up only in one direction in the below table 1950 * (top to bottom). 1951 * 1952 * Also, if you expect a function to be called with a lock held, explicitly document 1953 * this in the comments on top of your function definition. 1954 * 1955 * And also, try to keep the critical sections (lock hold time) to be as minimal as 1956 * possible. Blocking / calling other functions with a lock held always increase 1957 * the risk of a possible deadlock. 1958 * 1959 * Following this rule will avoid unnecessary deadlocks, which can get really hard to 1960 * debug. Also, any new lock that you introduce, please add to this list in the correct 1961 * order. 1962 * 1963 * Please populate this list whenever you introduce new locks in your changes. Or in 1964 * case I've missed some existing locks. Please ensure that it's added in the list 1965 * based on the locking order expected. 1966 * 1967 * ===================================================================================== 1968 * Lock Protects Initialization fn 1969 * ===================================================================================== 1970 * vol_list_lock 1971 * vol_info->ctx_lock vol_info->ctx 1972 * cifs_sb_info->tlink_tree_lock cifs_sb_info->tlink_tree cifs_setup_cifs_sb 1973 * TCP_Server_Info-> TCP_Server_Info cifs_get_tcp_session 1974 * reconnect_mutex 1975 * TCP_Server_Info->srv_mutex TCP_Server_Info cifs_get_tcp_session 1976 * cifs_ses->session_mutex cifs_ses sesInfoAlloc 1977 * cifs_tcon 1978 * cifs_tcon->open_file_lock cifs_tcon->openFileList tconInfoAlloc 1979 * cifs_tcon->pending_opens 1980 * cifs_tcon->stat_lock cifs_tcon->bytes_read tconInfoAlloc 1981 * cifs_tcon->bytes_written 1982 * cifs_tcp_ses_lock cifs_tcp_ses_list sesInfoAlloc 1983 * GlobalMid_Lock GlobalMaxActiveXid init_cifs 1984 * GlobalCurrentXid 1985 * GlobalTotalActiveXid 1986 * TCP_Server_Info->srv_lock (anything in struct not protected by another lock and can change) 1987 * TCP_Server_Info->mid_lock TCP_Server_Info->pending_mid_q cifs_get_tcp_session 1988 * ->CurrentMid 1989 * (any changes in mid_q_entry fields) 1990 * TCP_Server_Info->req_lock TCP_Server_Info->in_flight cifs_get_tcp_session 1991 * ->credits 1992 * ->echo_credits 1993 * ->oplock_credits 1994 * ->reconnect_instance 1995 * cifs_ses->ses_lock (anything that is not protected by another lock and can change) 1996 * cifs_ses->iface_lock cifs_ses->iface_list sesInfoAlloc 1997 * ->iface_count 1998 * ->iface_last_update 1999 * cifs_ses->chan_lock cifs_ses->chans 2000 * ->chans_need_reconnect 2001 * ->chans_in_reconnect 2002 * cifs_tcon->tc_lock (anything that is not protected by another lock and can change) 2003 * cifsInodeInfo->open_file_lock cifsInodeInfo->openFileList cifs_alloc_inode 2004 * cifsInodeInfo->writers_lock cifsInodeInfo->writers cifsInodeInfo_alloc 2005 * cifsInodeInfo->lock_sem cifsInodeInfo->llist cifs_init_once 2006 * ->can_cache_brlcks 2007 * cifsInodeInfo->deferred_lock cifsInodeInfo->deferred_closes cifsInodeInfo_alloc 2008 * cached_fid->fid_mutex cifs_tcon->crfid tcon_info_alloc 2009 * cifsFileInfo->fh_mutex cifsFileInfo cifs_new_fileinfo 2010 * cifsFileInfo->file_info_lock cifsFileInfo->count cifs_new_fileinfo 2011 * ->invalidHandle initiate_cifs_search 2012 * ->oplock_break_cancelled 2013 * cifs_aio_ctx->aio_mutex cifs_aio_ctx cifs_aio_ctx_alloc 2014 ****************************************************************************/ 2015 2016 #ifdef DECLARE_GLOBALS_HERE 2017 #define GLOBAL_EXTERN 2018 #else 2019 #define GLOBAL_EXTERN extern 2020 #endif 2021 2022 /* 2023 * the list of TCP_Server_Info structures, ie each of the sockets 2024 * connecting our client to a distinct server (ip address), is 2025 * chained together by cifs_tcp_ses_list. The list of all our SMB 2026 * sessions (and from that the tree connections) can be found 2027 * by iterating over cifs_tcp_ses_list 2028 */ 2029 extern struct list_head cifs_tcp_ses_list; 2030 2031 /* 2032 * This lock protects the cifs_tcp_ses_list, the list of smb sessions per 2033 * tcp session, and the list of tcon's per smb session. It also protects 2034 * the reference counters for the server, smb session, and tcon. 2035 * generally the locks should be taken in order tcp_ses_lock before 2036 * tcon->open_file_lock and that before file->file_info_lock since the 2037 * structure order is cifs_socket-->cifs_ses-->cifs_tcon-->cifs_file 2038 */ 2039 extern spinlock_t cifs_tcp_ses_lock; 2040 2041 /* 2042 * Global transaction id (XID) information 2043 */ 2044 extern unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ 2045 extern unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ 2046 extern unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ 2047 extern spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ 2048 2049 /* 2050 * Global counters, updated atomically 2051 */ 2052 extern atomic_t sesInfoAllocCount; 2053 extern atomic_t tconInfoAllocCount; 2054 extern atomic_t tcpSesNextId; 2055 extern atomic_t tcpSesAllocCount; 2056 extern atomic_t tcpSesReconnectCount; 2057 extern atomic_t tconInfoReconnectCount; 2058 2059 /* Various Debug counters */ 2060 extern atomic_t buf_alloc_count; /* current number allocated */ 2061 extern atomic_t small_buf_alloc_count; 2062 #ifdef CONFIG_CIFS_STATS2 2063 extern atomic_t total_buf_alloc_count; /* total allocated over all time */ 2064 extern atomic_t total_small_buf_alloc_count; 2065 extern unsigned int slow_rsp_threshold; /* number of secs before logging */ 2066 #endif 2067 2068 /* Misc globals */ 2069 extern bool enable_oplocks; /* enable or disable oplocks */ 2070 extern bool lookupCacheEnabled; 2071 extern unsigned int global_secflags; /* if on, session setup sent 2072 with more secure ntlmssp2 challenge/resp */ 2073 extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */ 2074 extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */ 2075 extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */ 2076 extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */ 2077 extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/ 2078 extern unsigned int CIFSMaxBufSize; /* max size not including hdr */ 2079 extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */ 2080 extern unsigned int cifs_min_small; /* min size of small buf pool */ 2081 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/ 2082 extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */ 2083 extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */ 2084 extern atomic_t mid_count; 2085 2086 void cifs_oplock_break(struct work_struct *work); 2087 void cifs_queue_oplock_break(struct cifsFileInfo *cfile); 2088 void smb2_deferred_work_close(struct work_struct *work); 2089 2090 extern const struct slow_work_ops cifs_oplock_break_ops; 2091 extern struct workqueue_struct *cifsiod_wq; 2092 extern struct workqueue_struct *decrypt_wq; 2093 extern struct workqueue_struct *fileinfo_put_wq; 2094 extern struct workqueue_struct *cifsoplockd_wq; 2095 extern struct workqueue_struct *deferredclose_wq; 2096 extern struct workqueue_struct *serverclose_wq; 2097 extern __u32 cifs_lock_secret; 2098 2099 extern mempool_t *cifs_mid_poolp; 2100 2101 /* Operations for different SMB versions */ 2102 #define SMB1_VERSION_STRING "1.0" 2103 #define SMB20_VERSION_STRING "2.0" 2104 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 2105 extern struct smb_version_operations smb1_operations; 2106 extern struct smb_version_values smb1_values; 2107 extern struct smb_version_operations smb20_operations; 2108 extern struct smb_version_values smb20_values; 2109 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 2110 #define SMB21_VERSION_STRING "2.1" 2111 extern struct smb_version_operations smb21_operations; 2112 extern struct smb_version_values smb21_values; 2113 #define SMBDEFAULT_VERSION_STRING "default" 2114 extern struct smb_version_values smbdefault_values; 2115 #define SMB3ANY_VERSION_STRING "3" 2116 extern struct smb_version_values smb3any_values; 2117 #define SMB30_VERSION_STRING "3.0" 2118 extern struct smb_version_operations smb30_operations; 2119 extern struct smb_version_values smb30_values; 2120 #define SMB302_VERSION_STRING "3.02" 2121 #define ALT_SMB302_VERSION_STRING "3.0.2" 2122 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */ 2123 extern struct smb_version_values smb302_values; 2124 #define SMB311_VERSION_STRING "3.1.1" 2125 #define ALT_SMB311_VERSION_STRING "3.11" 2126 extern struct smb_version_operations smb311_operations; 2127 extern struct smb_version_values smb311_values; 2128 2129 static inline char *get_security_type_str(enum securityEnum sectype) 2130 { 2131 switch (sectype) { 2132 case RawNTLMSSP: 2133 return "RawNTLMSSP"; 2134 case Kerberos: 2135 return "Kerberos"; 2136 case NTLMv2: 2137 return "NTLMv2"; 2138 default: 2139 return "Unknown"; 2140 } 2141 } 2142 2143 static inline bool is_smb1_server(struct TCP_Server_Info *server) 2144 { 2145 return strcmp(server->vals->version_string, SMB1_VERSION_STRING) == 0; 2146 } 2147 2148 static inline bool is_tcon_dfs(struct cifs_tcon *tcon) 2149 { 2150 /* 2151 * For SMB1, see MS-CIFS 2.4.55 SMB_COM_TREE_CONNECT_ANDX (0x75) and MS-CIFS 3.3.4.4 DFS 2152 * Subsystem Notifies That a Share Is a DFS Share. 2153 * 2154 * For SMB2+, see MS-SMB2 2.2.10 SMB2 TREE_CONNECT Response and MS-SMB2 3.3.4.14 Server 2155 * Application Updates a Share. 2156 */ 2157 if (!tcon || !tcon->ses || !tcon->ses->server) 2158 return false; 2159 return is_smb1_server(tcon->ses->server) ? tcon->Flags & SMB_SHARE_IS_IN_DFS : 2160 tcon->share_flags & (SHI1005_FLAGS_DFS | SHI1005_FLAGS_DFS_ROOT); 2161 } 2162 2163 static inline bool cifs_is_referral_server(struct cifs_tcon *tcon, 2164 const struct dfs_info3_param *ref) 2165 { 2166 /* 2167 * Check if all targets are capable of handling DFS referrals as per 2168 * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. 2169 */ 2170 return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER)); 2171 } 2172 2173 static inline u64 cifs_flock_len(const struct file_lock *fl) 2174 { 2175 return (u64)fl->fl_end - fl->fl_start + 1; 2176 } 2177 2178 static inline size_t ntlmssp_workstation_name_size(const struct cifs_ses *ses) 2179 { 2180 if (WARN_ON_ONCE(!ses || !ses->server)) 2181 return 0; 2182 /* 2183 * Make workstation name no more than 15 chars when using insecure dialects as some legacy 2184 * servers do require it during NTLMSSP. 2185 */ 2186 if (ses->server->dialect <= SMB20_PROT_ID) 2187 return min_t(size_t, sizeof(ses->workstation_name), RFC1001_NAME_LEN_WITH_NULL); 2188 return sizeof(ses->workstation_name); 2189 } 2190 2191 static inline void move_cifs_info_to_smb2(struct smb2_file_all_info *dst, const FILE_ALL_INFO *src) 2192 { 2193 memcpy(dst, src, (size_t)((u8 *)&src->AccessFlags - (u8 *)src)); 2194 dst->AccessFlags = src->AccessFlags; 2195 dst->CurrentByteOffset = src->CurrentByteOffset; 2196 dst->Mode = src->Mode; 2197 dst->AlignmentRequirement = src->AlignmentRequirement; 2198 dst->FileNameLength = src->FileNameLength; 2199 } 2200 2201 static inline int cifs_get_num_sgs(const struct smb_rqst *rqst, 2202 int num_rqst, 2203 const u8 *sig) 2204 { 2205 unsigned int len, skip; 2206 unsigned int nents = 0; 2207 unsigned long addr; 2208 size_t data_size; 2209 int i, j; 2210 2211 /* 2212 * The first rqst has a transform header where the first 20 bytes are 2213 * not part of the encrypted blob. 2214 */ 2215 skip = 20; 2216 2217 /* Assumes the first rqst has a transform header as the first iov. 2218 * I.e. 2219 * rqst[0].rq_iov[0] is transform header 2220 * rqst[0].rq_iov[1+] data to be encrypted/decrypted 2221 * rqst[1+].rq_iov[0+] data to be encrypted/decrypted 2222 */ 2223 for (i = 0; i < num_rqst; i++) { 2224 data_size = iov_iter_count(&rqst[i].rq_iter); 2225 2226 /* We really don't want a mixture of pinned and unpinned pages 2227 * in the sglist. It's hard to keep track of which is what. 2228 * Instead, we convert to a BVEC-type iterator higher up. 2229 */ 2230 if (data_size && 2231 WARN_ON_ONCE(user_backed_iter(&rqst[i].rq_iter))) 2232 return -EIO; 2233 2234 /* We also don't want to have any extra refs or pins to clean 2235 * up in the sglist. 2236 */ 2237 if (data_size && 2238 WARN_ON_ONCE(iov_iter_extract_will_pin(&rqst[i].rq_iter))) 2239 return -EIO; 2240 2241 for (j = 0; j < rqst[i].rq_nvec; j++) { 2242 struct kvec *iov = &rqst[i].rq_iov[j]; 2243 2244 addr = (unsigned long)iov->iov_base + skip; 2245 if (unlikely(is_vmalloc_addr((void *)addr))) { 2246 len = iov->iov_len - skip; 2247 nents += DIV_ROUND_UP(offset_in_page(addr) + len, 2248 PAGE_SIZE); 2249 } else { 2250 nents++; 2251 } 2252 skip = 0; 2253 } 2254 if (data_size) 2255 nents += iov_iter_npages(&rqst[i].rq_iter, INT_MAX); 2256 } 2257 nents += DIV_ROUND_UP(offset_in_page(sig) + SMB2_SIGNATURE_SIZE, PAGE_SIZE); 2258 return nents; 2259 } 2260 2261 /* We can not use the normal sg_set_buf() as we will sometimes pass a 2262 * stack object as buf. 2263 */ 2264 static inline void cifs_sg_set_buf(struct sg_table *sgtable, 2265 const void *buf, 2266 unsigned int buflen) 2267 { 2268 unsigned long addr = (unsigned long)buf; 2269 unsigned int off = offset_in_page(addr); 2270 2271 addr &= PAGE_MASK; 2272 if (unlikely(is_vmalloc_addr((void *)addr))) { 2273 do { 2274 unsigned int len = min_t(unsigned int, buflen, PAGE_SIZE - off); 2275 2276 sg_set_page(&sgtable->sgl[sgtable->nents++], 2277 vmalloc_to_page((void *)addr), len, off); 2278 2279 off = 0; 2280 addr += PAGE_SIZE; 2281 buflen -= len; 2282 } while (buflen); 2283 } else { 2284 sg_set_page(&sgtable->sgl[sgtable->nents++], 2285 virt_to_page((void *)addr), buflen, off); 2286 } 2287 } 2288 2289 struct smb2_compound_vars { 2290 struct cifs_open_parms oparms; 2291 struct kvec rsp_iov[MAX_COMPOUND]; 2292 struct smb_rqst rqst[MAX_COMPOUND]; 2293 struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; 2294 struct kvec qi_iov; 2295 struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; 2296 struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE]; 2297 struct kvec close_iov; 2298 struct smb2_file_rename_info rename_info; 2299 struct smb2_file_link_info link_info; 2300 }; 2301 2302 static inline bool cifs_ses_exiting(struct cifs_ses *ses) 2303 { 2304 bool ret; 2305 2306 spin_lock(&ses->ses_lock); 2307 ret = ses->ses_status == SES_EXITING; 2308 spin_unlock(&ses->ses_lock); 2309 return ret; 2310 } 2311 2312 #endif /* _CIFS_GLOB_H */ 2313