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