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Linux/fs/cifs/cifsglob.h

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  1 /*
  2  *   fs/cifs/cifsglob.h
  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  *   This library is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU Lesser General Public License as published
 10  *   by the Free Software Foundation; either version 2.1 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This library is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 16  *   the GNU Lesser General Public License for more details.
 17  *
 18  */
 19 #ifndef _CIFS_GLOB_H
 20 #define _CIFS_GLOB_H
 21 
 22 #include <linux/in.h>
 23 #include <linux/in6.h>
 24 #include <linux/slab.h>
 25 #include <linux/mempool.h>
 26 #include <linux/workqueue.h>
 27 #include "cifs_fs_sb.h"
 28 #include "cifsacl.h"
 29 #include <crypto/internal/hash.h>
 30 #include <linux/scatterlist.h>
 31 #include <uapi/linux/cifs/cifs_mount.h>
 32 #ifdef CONFIG_CIFS_SMB2
 33 #include "smb2pdu.h"
 34 #endif
 35 
 36 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
 37 
 38 /*
 39  * The sizes of various internal tables and strings
 40  */
 41 #define MAX_UID_INFO 16
 42 #define MAX_SES_INFO 2
 43 #define MAX_TCON_INFO 4
 44 
 45 #define MAX_TREE_SIZE (2 + CIFS_NI_MAXHOST + 1 + CIFS_MAX_SHARE_LEN + 1)
 46 
 47 #define CIFS_MIN_RCV_POOL 4
 48 
 49 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
 50 /*
 51  * default attribute cache timeout (jiffies)
 52  */
 53 #define CIFS_DEF_ACTIMEO (1 * HZ)
 54 
 55 /*
 56  * max attribute cache timeout (jiffies) - 2^30
 57  */
 58 #define CIFS_MAX_ACTIMEO (1 << 30)
 59 
 60 /*
 61  * MAX_REQ is the maximum number of requests that WE will send
 62  * on one socket concurrently.
 63  */
 64 #define CIFS_MAX_REQ 32767
 65 
 66 #define RFC1001_NAME_LEN 15
 67 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
 68 
 69 /* currently length of NIP6_FMT */
 70 #define SERVER_NAME_LENGTH 40
 71 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
 72 
 73 /* echo interval in seconds */
 74 #define SMB_ECHO_INTERVAL_MIN 1
 75 #define SMB_ECHO_INTERVAL_MAX 600
 76 #define SMB_ECHO_INTERVAL_DEFAULT 60
 77 
 78 #include "cifspdu.h"
 79 
 80 #ifndef XATTR_DOS_ATTRIB
 81 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
 82 #endif
 83 
 84 /*
 85  * CIFS vfs client Status information (based on what we know.)
 86  */
 87 
 88 /* associated with each tcp and smb session */
 89 enum statusEnum {
 90         CifsNew = 0,
 91         CifsGood,
 92         CifsExiting,
 93         CifsNeedReconnect,
 94         CifsNeedNegotiate
 95 };
 96 
 97 enum securityEnum {
 98         Unspecified = 0,        /* not specified */
 99         LANMAN,                 /* Legacy LANMAN auth */
100         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
101         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
102         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
103         Kerberos,               /* Kerberos via SPNEGO */
104 };
105 
106 struct session_key {
107         unsigned int len;
108         char *response;
109 };
110 
111 /* crypto security descriptor definition */
112 struct sdesc {
113         struct shash_desc shash;
114         char ctx[];
115 };
116 
117 /* crypto hashing related structure/fields, not specific to a sec mech */
118 struct cifs_secmech {
119         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
120         struct crypto_shash *md5; /* md5 hash function */
121         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
122         struct crypto_shash *cmacaes; /* block-cipher based MAC function */
123         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
124         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
125         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
126         struct sdesc *sdesccmacaes;  /* ctxt to generate smb3 signature */
127 };
128 
129 /* per smb session structure/fields */
130 struct ntlmssp_auth {
131         bool sesskey_per_smbsess; /* whether session key is per smb session */
132         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
133         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
134         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
135         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
136 };
137 
138 struct cifs_cred {
139         int uid;
140         int gid;
141         int mode;
142         int cecount;
143         struct cifs_sid osid;
144         struct cifs_sid gsid;
145         struct cifs_ntace *ntaces;
146         struct cifs_ace *aces;
147 };
148 
149 /*
150  *****************************************************************
151  * Except the CIFS PDUs themselves all the
152  * globally interesting structs should go here
153  *****************************************************************
154  */
155 
156 /*
157  * A smb_rqst represents a complete request to be issued to a server. It's
158  * formed by a kvec array, followed by an array of pages. Page data is assumed
159  * to start at the beginning of the first page.
160  */
161 struct smb_rqst {
162         struct kvec     *rq_iov;        /* array of kvecs */
163         unsigned int    rq_nvec;        /* number of kvecs in array */
164         struct page     **rq_pages;     /* pointer to array of page ptrs */
165         unsigned int    rq_npages;      /* number pages in array */
166         unsigned int    rq_pagesz;      /* page size to use */
167         unsigned int    rq_tailsz;      /* length of last page */
168 };
169 
170 enum smb_version {
171         Smb_1 = 1,
172         Smb_20,
173         Smb_21,
174         Smb_30,
175         Smb_302,
176 #ifdef CONFIG_CIFS_SMB311
177         Smb_311,
178 #endif /* SMB311 */
179         Smb_version_err
180 };
181 
182 struct mid_q_entry;
183 struct TCP_Server_Info;
184 struct cifsFileInfo;
185 struct cifs_ses;
186 struct cifs_tcon;
187 struct dfs_info3_param;
188 struct cifs_fattr;
189 struct smb_vol;
190 struct cifs_fid;
191 struct cifs_readdata;
192 struct cifs_writedata;
193 struct cifs_io_parms;
194 struct cifs_search_info;
195 struct cifsInodeInfo;
196 struct cifs_open_parms;
197 
198 struct smb_version_operations {
199         int (*send_cancel)(struct TCP_Server_Info *, void *,
200                            struct mid_q_entry *);
201         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
202         /* setup request: allocate mid, sign message */
203         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
204                                                 struct smb_rqst *);
205         /* setup async request: allocate mid, sign message */
206         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
207                                                 struct smb_rqst *);
208         /* check response: verify signature, map error */
209         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
210                              bool);
211         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
212                             const int);
213         void (*set_credits)(struct TCP_Server_Info *, const int);
214         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
215         unsigned int (*get_credits)(struct mid_q_entry *);
216         __u64 (*get_next_mid)(struct TCP_Server_Info *);
217         /* data offset from read response message */
218         unsigned int (*read_data_offset)(char *);
219         /* data length from read response message */
220         unsigned int (*read_data_length)(char *);
221         /* map smb to linux error */
222         int (*map_error)(char *, bool);
223         /* find mid corresponding to the response message */
224         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
225         void (*dump_detail)(void *);
226         void (*clear_stats)(struct cifs_tcon *);
227         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
228         void (*dump_share_caps)(struct seq_file *, struct cifs_tcon *);
229         /* verify the message */
230         int (*check_message)(char *, unsigned int, struct TCP_Server_Info *);
231         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
232         void (*downgrade_oplock)(struct TCP_Server_Info *,
233                                         struct cifsInodeInfo *, bool);
234         /* process transaction2 response */
235         bool (*check_trans2)(struct mid_q_entry *, struct TCP_Server_Info *,
236                              char *, int);
237         /* check if we need to negotiate */
238         bool (*need_neg)(struct TCP_Server_Info *);
239         /* negotiate to the server */
240         int (*negotiate)(const unsigned int, struct cifs_ses *);
241         /* set negotiated write size */
242         unsigned int (*negotiate_wsize)(struct cifs_tcon *, struct smb_vol *);
243         /* set negotiated read size */
244         unsigned int (*negotiate_rsize)(struct cifs_tcon *, struct smb_vol *);
245         /* setup smb sessionn */
246         int (*sess_setup)(const unsigned int, struct cifs_ses *,
247                           const struct nls_table *);
248         /* close smb session */
249         int (*logoff)(const unsigned int, struct cifs_ses *);
250         /* connect to a server share */
251         int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
252                             struct cifs_tcon *, const struct nls_table *);
253         /* close tree connecion */
254         int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
255         /* get DFS referrals */
256         int (*get_dfs_refer)(const unsigned int, struct cifs_ses *,
257                              const char *, struct dfs_info3_param **,
258                              unsigned int *, const struct nls_table *, int);
259         /* informational QFS call */
260         void (*qfs_tcon)(const unsigned int, struct cifs_tcon *);
261         /* check if a path is accessible or not */
262         int (*is_path_accessible)(const unsigned int, struct cifs_tcon *,
263                                   struct cifs_sb_info *, const char *);
264         /* query path data from the server */
265         int (*query_path_info)(const unsigned int, struct cifs_tcon *,
266                                struct cifs_sb_info *, const char *,
267                                FILE_ALL_INFO *, bool *, bool *);
268         /* query file data from the server */
269         int (*query_file_info)(const unsigned int, struct cifs_tcon *,
270                                struct cifs_fid *, FILE_ALL_INFO *);
271         /* get server index number */
272         int (*get_srv_inum)(const unsigned int, struct cifs_tcon *,
273                             struct cifs_sb_info *, const char *,
274                             u64 *uniqueid, FILE_ALL_INFO *);
275         /* set size by path */
276         int (*set_path_size)(const unsigned int, struct cifs_tcon *,
277                              const char *, __u64, struct cifs_sb_info *, bool);
278         /* set size by file handle */
279         int (*set_file_size)(const unsigned int, struct cifs_tcon *,
280                              struct cifsFileInfo *, __u64, bool);
281         /* set attributes */
282         int (*set_file_info)(struct inode *, const char *, FILE_BASIC_INFO *,
283                              const unsigned int);
284         int (*set_compression)(const unsigned int, struct cifs_tcon *,
285                                struct cifsFileInfo *);
286         /* check if we can send an echo or nor */
287         bool (*can_echo)(struct TCP_Server_Info *);
288         /* send echo request */
289         int (*echo)(struct TCP_Server_Info *);
290         /* create directory */
291         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
292                      struct cifs_sb_info *);
293         /* set info on created directory */
294         void (*mkdir_setinfo)(struct inode *, const char *,
295                               struct cifs_sb_info *, struct cifs_tcon *,
296                               const unsigned int);
297         /* remove directory */
298         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
299                      struct cifs_sb_info *);
300         /* unlink file */
301         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
302                       struct cifs_sb_info *);
303         /* open, rename and delete file */
304         int (*rename_pending_delete)(const char *, struct dentry *,
305                                      const unsigned int);
306         /* send rename request */
307         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
308                       const char *, struct cifs_sb_info *);
309         /* send create hardlink request */
310         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
311                                const char *, const char *,
312                                struct cifs_sb_info *);
313         /* query symlink target */
314         int (*query_symlink)(const unsigned int, struct cifs_tcon *,
315                              const char *, char **, struct cifs_sb_info *);
316         /* open a file for non-posix mounts */
317         int (*open)(const unsigned int, struct cifs_open_parms *,
318                     __u32 *, FILE_ALL_INFO *);
319         /* set fid protocol-specific info */
320         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
321         /* close a file */
322         void (*close)(const unsigned int, struct cifs_tcon *,
323                       struct cifs_fid *);
324         /* send a flush request to the server */
325         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
326         /* async read from the server */
327         int (*async_readv)(struct cifs_readdata *);
328         /* async write to the server */
329         int (*async_writev)(struct cifs_writedata *,
330                             void (*release)(struct kref *));
331         /* sync read from the server */
332         int (*sync_read)(const unsigned int, struct cifs_fid *,
333                          struct cifs_io_parms *, unsigned int *, char **,
334                          int *);
335         /* sync write to the server */
336         int (*sync_write)(const unsigned int, struct cifs_fid *,
337                           struct cifs_io_parms *, unsigned int *, struct kvec *,
338                           unsigned long);
339         /* open dir, start readdir */
340         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
341                                const char *, struct cifs_sb_info *,
342                                struct cifs_fid *, __u16,
343                                struct cifs_search_info *);
344         /* continue readdir */
345         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
346                               struct cifs_fid *,
347                               __u16, struct cifs_search_info *srch_inf);
348         /* close dir */
349         int (*close_dir)(const unsigned int, struct cifs_tcon *,
350                          struct cifs_fid *);
351         /* calculate a size of SMB message */
352         unsigned int (*calc_smb_size)(void *);
353         /* check for STATUS_PENDING and process it in a positive case */
354         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
355         /* send oplock break response */
356         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
357                                struct cifsInodeInfo *);
358         /* query remote filesystem */
359         int (*queryfs)(const unsigned int, struct cifs_tcon *,
360                        struct kstatfs *);
361         /* send mandatory brlock to the server */
362         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
363                          __u64, __u32, int, int, bool);
364         /* unlock range of mandatory locks */
365         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
366                                  const unsigned int);
367         /* push brlocks from the cache to the server */
368         int (*push_mand_locks)(struct cifsFileInfo *);
369         /* get lease key of the inode */
370         void (*get_lease_key)(struct inode *, struct cifs_fid *);
371         /* set lease key of the inode */
372         void (*set_lease_key)(struct inode *, struct cifs_fid *);
373         /* generate new lease key */
374         void (*new_lease_key)(struct cifs_fid *);
375         int (*generate_signingkey)(struct cifs_ses *);
376         int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
377         int (*set_integrity)(const unsigned int, struct cifs_tcon *tcon,
378                              struct cifsFileInfo *src_file);
379         int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
380                                 struct cifs_sb_info *, const unsigned char *,
381                                 char *, unsigned int *);
382         int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
383                                  struct cifs_sb_info *, const unsigned char *,
384                                  char *, unsigned int *);
385         /* if we can do cache read operations */
386         bool (*is_read_op)(__u32);
387         /* set oplock level for the inode */
388         void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
389                                  bool *);
390         /* create lease context buffer for CREATE request */
391         char * (*create_lease_buf)(u8 *, u8);
392         /* parse lease context buffer and return oplock/epoch info */
393         __u8 (*parse_lease_buf)(void *, unsigned int *);
394         int (*clone_range)(const unsigned int, struct cifsFileInfo *src_file,
395                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
396                         u64 dest_off);
397         int (*duplicate_extents)(const unsigned int, struct cifsFileInfo *src,
398                         struct cifsFileInfo *target_file, u64 src_off, u64 len,
399                         u64 dest_off);
400         int (*validate_negotiate)(const unsigned int, struct cifs_tcon *);
401         ssize_t (*query_all_EAs)(const unsigned int, struct cifs_tcon *,
402                         const unsigned char *, const unsigned char *, char *,
403                         size_t, const struct nls_table *, int);
404         int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
405                         const char *, const void *, const __u16,
406                         const struct nls_table *, int);
407         struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
408                         const char *, u32 *);
409         struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,
410                         const struct cifs_fid *, u32 *);
411         int (*set_acl)(struct cifs_ntsd *, __u32, struct inode *, const char *,
412                         int);
413         /* writepages retry size */
414         unsigned int (*wp_retry_size)(struct inode *);
415         /* get mtu credits */
416         int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
417                                 unsigned int *, unsigned int *);
418         /* check if we need to issue closedir */
419         bool (*dir_needs_close)(struct cifsFileInfo *);
420         long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
421                           loff_t);
422 };
423 
424 struct smb_version_values {
425         char            *version_string;
426         __u16           protocol_id;
427         __u32           req_capabilities;
428         __u32           large_lock_type;
429         __u32           exclusive_lock_type;
430         __u32           shared_lock_type;
431         __u32           unlock_lock_type;
432         size_t          header_size;
433         size_t          max_header_size;
434         size_t          read_rsp_size;
435         __le16          lock_cmd;
436         unsigned int    cap_unix;
437         unsigned int    cap_nt_find;
438         unsigned int    cap_large_files;
439         __u16           signing_enabled;
440         __u16           signing_required;
441         size_t          create_lease_size;
442 };
443 
444 #define HEADER_SIZE(server) (server->vals->header_size)
445 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
446 
447 struct smb_vol {
448         char *username;
449         char *password;
450         char *domainname;
451         char *UNC;
452         char *iocharset;  /* local code page for mapping to and from Unicode */
453         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
454         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
455         kuid_t cred_uid;
456         kuid_t linux_uid;
457         kgid_t linux_gid;
458         kuid_t backupuid;
459         kgid_t backupgid;
460         umode_t file_mode;
461         umode_t dir_mode;
462         enum securityEnum sectype; /* sectype requested via mnt opts */
463         bool sign; /* was signing requested via mnt opts? */
464         bool retry:1;
465         bool intr:1;
466         bool setuids:1;
467         bool override_uid:1;
468         bool override_gid:1;
469         bool dynperm:1;
470         bool noperm:1;
471         bool no_psx_acl:1; /* set if posix acl support should be disabled */
472         bool cifs_acl:1;
473         bool backupuid_specified; /* mount option  backupuid  is specified */
474         bool backupgid_specified; /* mount option  backupgid  is specified */
475         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
476         bool server_ino:1; /* use inode numbers from server ie UniqueId */
477         bool direct_io:1;
478         bool strict_io:1; /* strict cache behavior */
479         bool remap:1;      /* set to remap seven reserved chars in filenames */
480         bool sfu_remap:1;  /* remap seven reserved chars ala SFU */
481         bool posix_paths:1; /* unset to not ask for posix pathnames. */
482         bool no_linux_ext:1;
483         bool sfu_emul:1;
484         bool nullauth:1;   /* attempt to authenticate with null user */
485         bool nocase:1;     /* request case insensitive filenames */
486         bool nobrl:1;      /* disable sending byte range locks to srv */
487         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
488         bool seal:1;       /* request transport encryption on share */
489         bool nodfs:1;      /* Do not request DFS, even if available */
490         bool local_lease:1; /* check leases only on local system, not remote */
491         bool noblocksnd:1;
492         bool noautotune:1;
493         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
494         bool fsc:1;     /* enable fscache */
495         bool mfsymlinks:1; /* use Minshall+French Symlinks */
496         bool multiuser:1;
497         bool rwpidforward:1; /* pid forward for read/write operations */
498         bool nosharesock:1;
499         bool persistent:1;
500         bool nopersistent:1;
501         bool resilient:1; /* noresilient not required since not fored for CA */
502         unsigned int rsize;
503         unsigned int wsize;
504         bool sockopt_tcp_nodelay:1;
505         unsigned long actimeo; /* attribute cache timeout (jiffies) */
506         struct smb_version_operations *ops;
507         struct smb_version_values *vals;
508         char *prepath;
509         struct sockaddr_storage dstaddr; /* destination address */
510         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
511         struct nls_table *local_nls;
512         unsigned int echo_interval; /* echo interval in secs */
513 };
514 
515 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
516                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
517                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
518                          CIFS_MOUNT_MAP_SFM_CHR | \
519                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
520                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
521                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
522                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
523                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
524                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
525                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
526 
527 #define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
528                       MS_NODEV | MS_SYNCHRONOUS)
529 
530 struct cifs_mnt_data {
531         struct cifs_sb_info *cifs_sb;
532         struct smb_vol *vol;
533         int flags;
534 };
535 
536 static inline unsigned int
537 get_rfc1002_length(void *buf)
538 {
539         return be32_to_cpu(*((__be32 *)buf)) & 0xffffff;
540 }
541 
542 static inline void
543 inc_rfc1001_len(void *buf, int count)
544 {
545         be32_add_cpu((__be32 *)buf, count);
546 }
547 
548 struct TCP_Server_Info {
549         struct list_head tcp_ses_list;
550         struct list_head smb_ses_list;
551         int srv_count; /* reference counter */
552         /* 15 character server name + 0x20 16th byte indicating type = srv */
553         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
554         struct smb_version_operations   *ops;
555         struct smb_version_values       *vals;
556         enum statusEnum tcpStatus; /* what we think the status is */
557         char *hostname; /* hostname portion of UNC string */
558         struct socket *ssocket;
559         struct sockaddr_storage dstaddr;
560         struct sockaddr_storage srcaddr; /* locally bind to this IP */
561 #ifdef CONFIG_NET_NS
562         struct net *net;
563 #endif
564         wait_queue_head_t response_q;
565         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
566         struct list_head pending_mid_q;
567         bool noblocksnd;                /* use blocking sendmsg */
568         bool noautotune;                /* do not autotune send buf sizes */
569         bool tcp_nodelay;
570         int credits;  /* send no more requests at once */
571         unsigned int in_flight;  /* number of requests on the wire to server */
572         spinlock_t req_lock;  /* protect the two values above */
573         struct mutex srv_mutex;
574         struct task_struct *tsk;
575         char server_GUID[16];
576         __u16 sec_mode;
577         bool sign; /* is signing enabled on this connection? */
578         bool session_estab; /* mark when very first sess is established */
579 #ifdef CONFIG_CIFS_SMB2
580         int echo_credits;  /* echo reserved slots */
581         int oplock_credits;  /* oplock break reserved slots */
582         bool echoes:1; /* enable echoes */
583         __u8 client_guid[SMB2_CLIENT_GUID_SIZE]; /* Client GUID */
584 #endif
585         u16 dialect; /* dialect index that server chose */
586         bool oplocks:1; /* enable oplocks */
587         unsigned int maxReq;    /* Clients should submit no more */
588         /* than maxReq distinct unanswered SMBs to the server when using  */
589         /* multiplexed reads or writes */
590         unsigned int maxBuf;    /* maxBuf specifies the maximum */
591         /* message size the server can send or receive for non-raw SMBs */
592         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
593         /* when socket is setup (and during reconnect) before NegProt sent */
594         unsigned int max_rw;    /* maxRw specifies the maximum */
595         /* message size the server can send or receive for */
596         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
597         unsigned int capabilities; /* selective disabling of caps by smb sess */
598         int timeAdj;  /* Adjust for difference in server time zone in sec */
599         __u64 CurrentMid;         /* multiplex id - rotating counter */
600         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
601         /* 16th byte of RFC1001 workstation name is always null */
602         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
603         __u32 sequence_number; /* for signing, protected by srv_mutex */
604         struct session_key session_key;
605         unsigned long lstrp; /* when we got last response from this server */
606         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
607 #define CIFS_NEGFLAVOR_LANMAN   0       /* wct == 13, LANMAN */
608 #define CIFS_NEGFLAVOR_UNENCAP  1       /* wct == 17, but no ext_sec */
609 #define CIFS_NEGFLAVOR_EXTENDED 2       /* wct == 17, ext_sec bit set */
610         char    negflavor;      /* NEGOTIATE response flavor */
611         /* extended security flavors that server supports */
612         bool    sec_ntlmssp;            /* supports NTLMSSP */
613         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
614         bool    sec_kerberos;           /* supports plain Kerberos */
615         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
616         bool    large_buf;              /* is current buffer large? */
617         struct delayed_work     echo; /* echo ping workqueue job */
618         struct kvec *iov;       /* reusable kvec array for receives */
619         unsigned int nr_iov;    /* number of kvecs in array */
620         char    *smallbuf;      /* pointer to current "small" buffer */
621         char    *bigbuf;        /* pointer to current "big" buffer */
622         unsigned int total_read; /* total amount of data read in this pass */
623 #ifdef CONFIG_CIFS_FSCACHE
624         struct fscache_cookie   *fscache; /* client index cache cookie */
625 #endif
626 #ifdef CONFIG_CIFS_STATS2
627         atomic_t in_send; /* requests trying to send */
628         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
629 #endif
630 #ifdef CONFIG_CIFS_SMB2
631         unsigned int    max_read;
632         unsigned int    max_write;
633         __u8            preauth_hash[512];
634 #endif /* CONFIG_CIFS_SMB2 */
635         unsigned long echo_interval;
636 };
637 
638 static inline unsigned int
639 in_flight(struct TCP_Server_Info *server)
640 {
641         unsigned int num;
642         spin_lock(&server->req_lock);
643         num = server->in_flight;
644         spin_unlock(&server->req_lock);
645         return num;
646 }
647 
648 static inline bool
649 has_credits(struct TCP_Server_Info *server, int *credits)
650 {
651         int num;
652         spin_lock(&server->req_lock);
653         num = *credits;
654         spin_unlock(&server->req_lock);
655         return num > 0;
656 }
657 
658 static inline void
659 add_credits(struct TCP_Server_Info *server, const unsigned int add,
660             const int optype)
661 {
662         server->ops->add_credits(server, add, optype);
663 }
664 
665 static inline void
666 add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,
667                         const int optype)
668 {
669         if (add) {
670                 server->ops->add_credits(server, add, optype);
671                 wake_up(&server->request_q);
672         }
673 }
674 
675 static inline void
676 set_credits(struct TCP_Server_Info *server, const int val)
677 {
678         server->ops->set_credits(server, val);
679 }
680 
681 static inline __le64
682 get_next_mid64(struct TCP_Server_Info *server)
683 {
684         return cpu_to_le64(server->ops->get_next_mid(server));
685 }
686 
687 static inline __le16
688 get_next_mid(struct TCP_Server_Info *server)
689 {
690         __u16 mid = server->ops->get_next_mid(server);
691         /*
692          * The value in the SMB header should be little endian for easy
693          * on-the-wire decoding.
694          */
695         return cpu_to_le16(mid);
696 }
697 
698 static inline __u16
699 get_mid(const struct smb_hdr *smb)
700 {
701         return le16_to_cpu(smb->Mid);
702 }
703 
704 static inline bool
705 compare_mid(__u16 mid, const struct smb_hdr *smb)
706 {
707         return mid == le16_to_cpu(smb->Mid);
708 }
709 
710 /*
711  * When the server supports very large reads and writes via POSIX extensions,
712  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
713  * including the RFC1001 length.
714  *
715  * Note that this might make for "interesting" allocation problems during
716  * writeback however as we have to allocate an array of pointers for the
717  * pages. A 16M write means ~32kb page array with PAGE_SIZE == 4096.
718  *
719  * For reads, there is a similar problem as we need to allocate an array
720  * of kvecs to handle the receive, though that should only need to be done
721  * once.
722  */
723 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
724 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
725 
726 /*
727  * When the server doesn't allow large posix writes, only allow a rsize/wsize
728  * of 2^17-1 minus the size of the call header. That allows for a read or
729  * write up to the maximum size described by RFC1002.
730  */
731 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
732 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
733 
734 /*
735  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
736  * pages in a single call. With PAGE_SIZE == 4k, this means we can fill
737  * a single wsize request with a single call.
738  */
739 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
740 
741 /*
742  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
743  * those values when posix extensions aren't in force. In actuality here, we
744  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
745  * to be ok with the extra byte even though Windows doesn't send writes that
746  * are that large.
747  *
748  * Citation:
749  *
750  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
751  */
752 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
753 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
754 
755 /*
756  * Macros to allow the TCP_Server_Info->net field and related code to drop out
757  * when CONFIG_NET_NS isn't set.
758  */
759 
760 #ifdef CONFIG_NET_NS
761 
762 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
763 {
764         return srv->net;
765 }
766 
767 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
768 {
769         srv->net = net;
770 }
771 
772 #else
773 
774 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
775 {
776         return &init_net;
777 }
778 
779 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
780 {
781 }
782 
783 #endif
784 
785 /*
786  * Session structure.  One of these for each uid session with a particular host
787  */
788 struct cifs_ses {
789         struct list_head smb_ses_list;
790         struct list_head tcon_list;
791         struct mutex session_mutex;
792         struct TCP_Server_Info *server; /* pointer to server info */
793         int ses_count;          /* reference counter */
794         enum statusEnum status;
795         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
796         __u16 ipc_tid;          /* special tid for connection to IPC share */
797         char *serverOS;         /* name of operating system underlying server */
798         char *serverNOS;        /* name of network operating system of server */
799         char *serverDomain;     /* security realm of server */
800         __u64 Suid;             /* remote smb uid  */
801         kuid_t linux_uid;       /* overriding owner of files on the mount */
802         kuid_t cred_uid;        /* owner of credentials */
803         unsigned int capabilities;
804         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
805                                 TCP names - will ipv6 and sctp addresses fit? */
806         char *user_name;        /* must not be null except during init of sess
807                                    and after mount option parsing we fill it */
808         char *domainName;
809         char *password;
810         struct session_key auth_key;
811         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
812         enum securityEnum sectype; /* what security flavor was specified? */
813         bool sign;              /* is signing required? */
814         bool need_reconnect:1; /* connection reset, uid now invalid */
815 #ifdef CONFIG_CIFS_SMB2
816         __u16 session_flags;
817         __u8 smb3signingkey[SMB3_SIGN_KEY_SIZE];
818         __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
819         __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
820         __u8 preauth_hash[512];
821 #endif /* CONFIG_CIFS_SMB2 */
822 };
823 
824 static inline bool
825 cap_unix(struct cifs_ses *ses)
826 {
827         return ses->server->vals->cap_unix & ses->capabilities;
828 }
829 
830 /*
831  * there is one of these for each connection to a resource on a particular
832  * session
833  */
834 struct cifs_tcon {
835         struct list_head tcon_list;
836         int tc_count;
837         struct list_head openFileList;
838         struct cifs_ses *ses;   /* pointer to session associated with */
839         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
840         char *nativeFileSystem;
841         char *password;         /* for share-level security */
842         __u32 tid;              /* The 4 byte tree id */
843         __u16 Flags;            /* optional support bits */
844         enum statusEnum tidStatus;
845 #ifdef CONFIG_CIFS_STATS
846         atomic_t num_smbs_sent;
847         union {
848                 struct {
849                         atomic_t num_writes;
850                         atomic_t num_reads;
851                         atomic_t num_flushes;
852                         atomic_t num_oplock_brks;
853                         atomic_t num_opens;
854                         atomic_t num_closes;
855                         atomic_t num_deletes;
856                         atomic_t num_mkdirs;
857                         atomic_t num_posixopens;
858                         atomic_t num_posixmkdirs;
859                         atomic_t num_rmdirs;
860                         atomic_t num_renames;
861                         atomic_t num_t2renames;
862                         atomic_t num_ffirst;
863                         atomic_t num_fnext;
864                         atomic_t num_fclose;
865                         atomic_t num_hardlinks;
866                         atomic_t num_symlinks;
867                         atomic_t num_locks;
868                         atomic_t num_acl_get;
869                         atomic_t num_acl_set;
870                 } cifs_stats;
871 #ifdef CONFIG_CIFS_SMB2
872                 struct {
873                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
874                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
875                 } smb2_stats;
876 #endif /* CONFIG_CIFS_SMB2 */
877         } stats;
878 #ifdef CONFIG_CIFS_STATS2
879         unsigned long long time_writes;
880         unsigned long long time_reads;
881         unsigned long long time_opens;
882         unsigned long long time_deletes;
883         unsigned long long time_closes;
884         unsigned long long time_mkdirs;
885         unsigned long long time_rmdirs;
886         unsigned long long time_renames;
887         unsigned long long time_t2renames;
888         unsigned long long time_ffirst;
889         unsigned long long time_fnext;
890         unsigned long long time_fclose;
891 #endif /* CONFIG_CIFS_STATS2 */
892         __u64    bytes_read;
893         __u64    bytes_written;
894         spinlock_t stat_lock;
895 #endif /* CONFIG_CIFS_STATS */
896         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
897         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
898         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
899         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
900         bool retry:1;
901         bool nocase:1;
902         bool seal:1;      /* transport encryption for this mounted share */
903         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
904                                 for this mount even if server would support */
905         bool local_lease:1; /* check leases (only) on local system not remote */
906         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
907         bool broken_sparse_sup; /* if server or share does not support sparse */
908         bool need_reconnect:1; /* connection reset, tid now invalid */
909         bool use_resilient:1; /* use resilient instead of durable handles */
910         bool use_persistent:1; /* use persistent instead of durable handles */
911 #ifdef CONFIG_CIFS_SMB2
912         bool print:1;           /* set if connection to printer share */
913         bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
914         __le32 capabilities;
915         __u32 share_flags;
916         __u32 maximal_access;
917         __u32 vol_serial_number;
918         __le64 vol_create_time;
919         __u32 ss_flags;         /* sector size flags */
920         __u32 perf_sector_size; /* best sector size for perf */
921         __u32 max_chunks;
922         __u32 max_bytes_chunk;
923         __u32 max_bytes_copy;
924 #endif /* CONFIG_CIFS_SMB2 */
925 #ifdef CONFIG_CIFS_FSCACHE
926         u64 resource_id;                /* server resource id */
927         struct fscache_cookie *fscache; /* cookie for share */
928 #endif
929         struct list_head pending_opens; /* list of incomplete opens */
930         /* BB add field for back pointer to sb struct(s)? */
931 };
932 
933 /*
934  * This is a refcounted and timestamped container for a tcon pointer. The
935  * container holds a tcon reference. It is considered safe to free one of
936  * these when the tl_count goes to 0. The tl_time is the time of the last
937  * "get" on the container.
938  */
939 struct tcon_link {
940         struct rb_node          tl_rbnode;
941         kuid_t                  tl_uid;
942         unsigned long           tl_flags;
943 #define TCON_LINK_MASTER        0
944 #define TCON_LINK_PENDING       1
945 #define TCON_LINK_IN_TREE       2
946         unsigned long           tl_time;
947         atomic_t                tl_count;
948         struct cifs_tcon        *tl_tcon;
949 };
950 
951 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
952 
953 static inline struct cifs_tcon *
954 tlink_tcon(struct tcon_link *tlink)
955 {
956         return tlink->tl_tcon;
957 }
958 
959 extern void cifs_put_tlink(struct tcon_link *tlink);
960 
961 static inline struct tcon_link *
962 cifs_get_tlink(struct tcon_link *tlink)
963 {
964         if (tlink && !IS_ERR(tlink))
965                 atomic_inc(&tlink->tl_count);
966         return tlink;
967 }
968 
969 /* This function is always expected to succeed */
970 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
971 
972 #define CIFS_OPLOCK_NO_CHANGE 0xfe
973 
974 struct cifs_pending_open {
975         struct list_head olist;
976         struct tcon_link *tlink;
977         __u8 lease_key[16];
978         __u32 oplock;
979 };
980 
981 /*
982  * This info hangs off the cifsFileInfo structure, pointed to by llist.
983  * This is used to track byte stream locks on the file
984  */
985 struct cifsLockInfo {
986         struct list_head llist; /* pointer to next cifsLockInfo */
987         struct list_head blist; /* pointer to locks blocked on this */
988         wait_queue_head_t block_q;
989         __u64 offset;
990         __u64 length;
991         __u32 pid;
992         __u32 type;
993 };
994 
995 /*
996  * One of these for each open instance of a file
997  */
998 struct cifs_search_info {
999         loff_t index_of_last_entry;
1000         __u16 entries_in_buffer;
1001         __u16 info_level;
1002         __u32 resume_key;
1003         char *ntwrk_buf_start;
1004         char *srch_entries_start;
1005         char *last_entry;
1006         const char *presume_name;
1007         unsigned int resume_name_len;
1008         bool endOfSearch:1;
1009         bool emptyDir:1;
1010         bool unicode:1;
1011         bool smallBuf:1; /* so we know which buf_release function to call */
1012 };
1013 
1014 struct cifs_open_parms {
1015         struct cifs_tcon *tcon;
1016         struct cifs_sb_info *cifs_sb;
1017         int disposition;
1018         int desired_access;
1019         int create_options;
1020         const char *path;
1021         struct cifs_fid *fid;
1022         bool reconnect:1;
1023 };
1024 
1025 struct cifs_fid {
1026         __u16 netfid;
1027 #ifdef CONFIG_CIFS_SMB2
1028         __u64 persistent_fid;   /* persist file id for smb2 */
1029         __u64 volatile_fid;     /* volatile file id for smb2 */
1030         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
1031         __u8 create_guid[16];
1032 #endif
1033         struct cifs_pending_open *pending_open;
1034         unsigned int epoch;
1035         bool purge_cache;
1036 };
1037 
1038 struct cifs_fid_locks {
1039         struct list_head llist;
1040         struct cifsFileInfo *cfile;     /* fid that owns locks */
1041         struct list_head locks;         /* locks held by fid above */
1042 };
1043 
1044 struct cifsFileInfo {
1045         struct list_head tlist; /* pointer to next fid owned by tcon */
1046         struct list_head flist; /* next fid (file instance) for this inode */
1047         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
1048         kuid_t uid;             /* allows finding which FileInfo structure */
1049         __u32 pid;              /* process id who opened file */
1050         struct cifs_fid fid;    /* file id from remote */
1051         /* BB add lock scope info here if needed */ ;
1052         /* lock scope id (0 if none) */
1053         struct dentry *dentry;
1054         unsigned int f_flags;
1055         struct tcon_link *tlink;
1056         bool invalidHandle:1;   /* file closed via session abend */
1057         bool oplock_break_cancelled:1;
1058         int count;              /* refcount protected by cifs_file_list_lock */
1059         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
1060         struct cifs_search_info srch_inf;
1061         struct work_struct oplock_break; /* work for oplock breaks */
1062 };
1063 
1064 struct cifs_io_parms {
1065         __u16 netfid;
1066 #ifdef CONFIG_CIFS_SMB2
1067         __u64 persistent_fid;   /* persist file id for smb2 */
1068         __u64 volatile_fid;     /* volatile file id for smb2 */
1069 #endif
1070         __u32 pid;
1071         __u64 offset;
1072         unsigned int length;
1073         struct cifs_tcon *tcon;
1074 };
1075 
1076 struct cifs_readdata;
1077 
1078 /* asynchronous read support */
1079 struct cifs_readdata {
1080         struct kref                     refcount;
1081         struct list_head                list;
1082         struct completion               done;
1083         struct cifsFileInfo             *cfile;
1084         struct address_space            *mapping;
1085         __u64                           offset;
1086         unsigned int                    bytes;
1087         unsigned int                    got_bytes;
1088         pid_t                           pid;
1089         int                             result;
1090         struct work_struct              work;
1091         int (*read_into_pages)(struct TCP_Server_Info *server,
1092                                 struct cifs_readdata *rdata,
1093                                 unsigned int len);
1094         struct kvec                     iov;
1095         unsigned int                    pagesz;
1096         unsigned int                    tailsz;
1097         unsigned int                    credits;
1098         unsigned int                    nr_pages;
1099         struct page                     *pages[];
1100 };
1101 
1102 struct cifs_writedata;
1103 
1104 /* asynchronous write support */
1105 struct cifs_writedata {
1106         struct kref                     refcount;
1107         struct list_head                list;
1108         struct completion               done;
1109         enum writeback_sync_modes       sync_mode;
1110         struct work_struct              work;
1111         struct cifsFileInfo             *cfile;
1112         __u64                           offset;
1113         pid_t                           pid;
1114         unsigned int                    bytes;
1115         int                             result;
1116         unsigned int                    pagesz;
1117         unsigned int                    tailsz;
1118         unsigned int                    credits;
1119         unsigned int                    nr_pages;
1120         struct page                     *pages[];
1121 };
1122 
1123 /*
1124  * Take a reference on the file private data. Must be called with
1125  * cifs_file_list_lock held.
1126  */
1127 static inline void
1128 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1129 {
1130         ++cifs_file->count;
1131 }
1132 
1133 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1134 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1135 
1136 #define CIFS_CACHE_READ_FLG     1
1137 #define CIFS_CACHE_HANDLE_FLG   2
1138 #define CIFS_CACHE_RH_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
1139 #define CIFS_CACHE_WRITE_FLG    4
1140 #define CIFS_CACHE_RW_FLG       (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
1141 #define CIFS_CACHE_RHW_FLG      (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
1142 
1143 #define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
1144 #define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
1145 #define CIFS_CACHE_WRITE(cinode) (cinode->oplock & CIFS_CACHE_WRITE_FLG)
1146 
1147 /*
1148  * One of these for each file inode
1149  */
1150 
1151 struct cifsInodeInfo {
1152         bool can_cache_brlcks;
1153         struct list_head llist; /* locks helb by this inode */
1154         struct rw_semaphore lock_sem;   /* protect the fields above */
1155         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1156         struct list_head openFileList;
1157         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1158         unsigned int oplock;            /* oplock/lease level we have */
1159         unsigned int epoch;             /* used to track lease state changes */
1160 #define CIFS_INODE_PENDING_OPLOCK_BREAK   (0) /* oplock break in progress */
1161 #define CIFS_INODE_PENDING_WRITERS        (1) /* Writes in progress */
1162 #define CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2 (2) /* Downgrade oplock to L2 */
1163 #define CIFS_INO_DELETE_PENDING           (3) /* delete pending on server */
1164 #define CIFS_INO_INVALID_MAPPING          (4) /* pagecache is invalid */
1165 #define CIFS_INO_LOCK                     (5) /* lock bit for synchronization */
1166         unsigned long flags;
1167         spinlock_t writers_lock;
1168         unsigned int writers;           /* Number of writers on this inode */
1169         unsigned long time;             /* jiffies of last update of inode */
1170         u64  server_eof;                /* current file size on server -- protected by i_lock */
1171         u64  uniqueid;                  /* server inode number */
1172         u64  createtime;                /* creation time on server */
1173 #ifdef CONFIG_CIFS_SMB2
1174         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1175 #endif
1176 #ifdef CONFIG_CIFS_FSCACHE
1177         struct fscache_cookie *fscache;
1178 #endif
1179         struct inode vfs_inode;
1180 };
1181 
1182 static inline struct cifsInodeInfo *
1183 CIFS_I(struct inode *inode)
1184 {
1185         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1186 }
1187 
1188 static inline struct cifs_sb_info *
1189 CIFS_SB(struct super_block *sb)
1190 {
1191         return sb->s_fs_info;
1192 }
1193 
1194 static inline struct cifs_sb_info *
1195 CIFS_FILE_SB(struct file *file)
1196 {
1197         return CIFS_SB(file_inode(file)->i_sb);
1198 }
1199 
1200 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1201 {
1202         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1203                 return '/';
1204         else
1205                 return '\\';
1206 }
1207 
1208 static inline void
1209 convert_delimiter(char *path, char delim)
1210 {
1211         char old_delim, *pos;
1212 
1213         if (delim == '/')
1214                 old_delim = '\\';
1215         else
1216                 old_delim = '/';
1217 
1218         pos = path;
1219         while ((pos = strchr(pos, old_delim)))
1220                 *pos = delim;
1221 }
1222 
1223 #ifdef CONFIG_CIFS_STATS
1224 #define cifs_stats_inc atomic_inc
1225 
1226 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1227                                             unsigned int bytes)
1228 {
1229         if (bytes) {
1230                 spin_lock(&tcon->stat_lock);
1231                 tcon->bytes_written += bytes;
1232                 spin_unlock(&tcon->stat_lock);
1233         }
1234 }
1235 
1236 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1237                                          unsigned int bytes)
1238 {
1239         spin_lock(&tcon->stat_lock);
1240         tcon->bytes_read += bytes;
1241         spin_unlock(&tcon->stat_lock);
1242 }
1243 #else
1244 
1245 #define  cifs_stats_inc(field) do {} while (0)
1246 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1247 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1248 
1249 #endif
1250 
1251 
1252 /*
1253  * This is the prototype for the mid receive function. This function is for
1254  * receiving the rest of the SMB frame, starting with the WordCount (which is
1255  * just after the MID in struct smb_hdr). Note:
1256  *
1257  * - This will be called by cifsd, with no locks held.
1258  * - The mid will still be on the pending_mid_q.
1259  * - mid->resp_buf will point to the current buffer.
1260  *
1261  * Returns zero on a successful receive, or an error. The receive state in
1262  * the TCP_Server_Info will also be updated.
1263  */
1264 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1265                             struct mid_q_entry *mid);
1266 
1267 /*
1268  * This is the prototype for the mid callback function. This is called once the
1269  * mid has been received off of the socket. When creating one, take special
1270  * care to avoid deadlocks. Things to bear in mind:
1271  *
1272  * - it will be called by cifsd, with no locks held
1273  * - the mid will be removed from any lists
1274  */
1275 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1276 
1277 /* one of these for every pending CIFS request to the server */
1278 struct mid_q_entry {
1279         struct list_head qhead; /* mids waiting on reply from this server */
1280         struct TCP_Server_Info *server; /* server corresponding to this mid */
1281         __u64 mid;              /* multiplex id */
1282         __u32 pid;              /* process id */
1283         __u32 sequence_number;  /* for CIFS signing */
1284         unsigned long when_alloc;  /* when mid was created */
1285 #ifdef CONFIG_CIFS_STATS2
1286         unsigned long when_sent; /* time when smb send finished */
1287         unsigned long when_received; /* when demux complete (taken off wire) */
1288 #endif
1289         mid_receive_t *receive; /* call receive callback */
1290         mid_callback_t *callback; /* call completion callback */
1291         void *callback_data;      /* general purpose pointer for callback */
1292         void *resp_buf;         /* pointer to received SMB header */
1293         int mid_state;  /* wish this were enum but can not pass to wait_event */
1294         __le16 command;         /* smb command code */
1295         bool large_buf:1;       /* if valid response, is pointer to large buf */
1296         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1297         bool multiEnd:1;        /* both received */
1298 };
1299 
1300 /*      Make code in transport.c a little cleaner by moving
1301         update of optional stats into function below */
1302 #ifdef CONFIG_CIFS_STATS2
1303 
1304 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1305 {
1306         atomic_inc(&server->in_send);
1307 }
1308 
1309 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1310 {
1311         atomic_dec(&server->in_send);
1312 }
1313 
1314 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1315 {
1316         atomic_inc(&server->num_waiters);
1317 }
1318 
1319 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1320 {
1321         atomic_dec(&server->num_waiters);
1322 }
1323 
1324 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1325 {
1326         mid->when_sent = jiffies;
1327 }
1328 #else
1329 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1330 {
1331 }
1332 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1333 {
1334 }
1335 
1336 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1337 {
1338 }
1339 
1340 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1341 {
1342 }
1343 
1344 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1345 {
1346 }
1347 #endif
1348 
1349 /* for pending dnotify requests */
1350 struct dir_notify_req {
1351         struct list_head lhead;
1352         __le16 Pid;
1353         __le16 PidHigh;
1354         __u16 Mid;
1355         __u16 Tid;
1356         __u16 Uid;
1357         __u16 netfid;
1358         __u32 filter; /* CompletionFilter (for multishot) */
1359         int multishot;
1360         struct file *pfile;
1361 };
1362 
1363 struct dfs_info3_param {
1364         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1365         int path_consumed;
1366         int server_type;
1367         int ref_flag;
1368         char *path_name;
1369         char *node_name;
1370 };
1371 
1372 /*
1373  * common struct for holding inode info when searching for or updating an
1374  * inode with new info
1375  */
1376 
1377 #define CIFS_FATTR_DFS_REFERRAL         0x1
1378 #define CIFS_FATTR_DELETE_PENDING       0x2
1379 #define CIFS_FATTR_NEED_REVAL           0x4
1380 #define CIFS_FATTR_INO_COLLISION        0x8
1381 #define CIFS_FATTR_UNKNOWN_NLINK        0x10
1382 
1383 struct cifs_fattr {
1384         u32             cf_flags;
1385         u32             cf_cifsattrs;
1386         u64             cf_uniqueid;
1387         u64             cf_eof;
1388         u64             cf_bytes;
1389         u64             cf_createtime;
1390         kuid_t          cf_uid;
1391         kgid_t          cf_gid;
1392         umode_t         cf_mode;
1393         dev_t           cf_rdev;
1394         unsigned int    cf_nlink;
1395         unsigned int    cf_dtype;
1396         struct timespec cf_atime;
1397         struct timespec cf_mtime;
1398         struct timespec cf_ctime;
1399 };
1400 
1401 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1402 {
1403         if (param) {
1404                 kfree(param->path_name);
1405                 kfree(param->node_name);
1406                 kfree(param);
1407         }
1408 }
1409 
1410 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1411                                        int number_of_items)
1412 {
1413         int i;
1414         if ((number_of_items == 0) || (param == NULL))
1415                 return;
1416         for (i = 0; i < number_of_items; i++) {
1417                 kfree(param[i].path_name);
1418                 kfree(param[i].node_name);
1419         }
1420         kfree(param);
1421 }
1422 
1423 #define   MID_FREE 0
1424 #define   MID_REQUEST_ALLOCATED 1
1425 #define   MID_REQUEST_SUBMITTED 2
1426 #define   MID_RESPONSE_RECEIVED 4
1427 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1428 #define   MID_RESPONSE_MALFORMED 0x10
1429 #define   MID_SHUTDOWN           0x20
1430 
1431 /* Types of response buffer returned from SendReceive2 */
1432 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1433 #define   CIFS_SMALL_BUFFER     1
1434 #define   CIFS_LARGE_BUFFER     2
1435 #define   CIFS_IOVEC            4    /* array of response buffers */
1436 
1437 /* Type of Request to SendReceive2 */
1438 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1439 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1440 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1441 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1442 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1443 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1444 
1445 /* Type of request operation */
1446 #define   CIFS_ECHO_OP      0x080    /* echo request */
1447 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1448 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1449 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1450 #define   CIFS_HAS_CREDITS 0x0400    /* already has credits */
1451 
1452 /* Security Flags: indicate type of session setup needed */
1453 #define   CIFSSEC_MAY_SIGN      0x00001
1454 #define   CIFSSEC_MAY_NTLM      0x00002
1455 #define   CIFSSEC_MAY_NTLMV2    0x00004
1456 #define   CIFSSEC_MAY_KRB5      0x00008
1457 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1458 #define   CIFSSEC_MAY_LANMAN    0x00010
1459 #define   CIFSSEC_MAY_PLNTXT    0x00020
1460 #else
1461 #define   CIFSSEC_MAY_LANMAN    0
1462 #define   CIFSSEC_MAY_PLNTXT    0
1463 #endif /* weak passwords */
1464 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1465 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1466 
1467 #define   CIFSSEC_MUST_SIGN     0x01001
1468 /* note that only one of the following can be set so the
1469 result of setting MUST flags more than once will be to
1470 require use of the stronger protocol */
1471 #define   CIFSSEC_MUST_NTLM     0x02002
1472 #define   CIFSSEC_MUST_NTLMV2   0x04004
1473 #define   CIFSSEC_MUST_KRB5     0x08008
1474 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1475 #define   CIFSSEC_MUST_LANMAN   0x10010
1476 #define   CIFSSEC_MUST_PLNTXT   0x20020
1477 #ifdef CONFIG_CIFS_UPCALL
1478 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1479 #else
1480 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1481 #endif /* UPCALL */
1482 #else /* do not allow weak pw hash */
1483 #define   CIFSSEC_MUST_LANMAN   0
1484 #define   CIFSSEC_MUST_PLNTXT   0
1485 #ifdef CONFIG_CIFS_UPCALL
1486 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1487 #else
1488 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1489 #endif /* UPCALL */
1490 #endif /* WEAK_PW_HASH */
1491 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1492 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1493 
1494 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
1495 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1496 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1497 /*
1498  *****************************************************************
1499  * All constants go here
1500  *****************************************************************
1501  */
1502 
1503 #define UID_HASH (16)
1504 
1505 /*
1506  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1507  * following to be declared.
1508  */
1509 
1510 /****************************************************************************
1511  *  Locking notes.  All updates to global variables and lists should be
1512  *                  protected by spinlocks or semaphores.
1513  *
1514  *  Spinlocks
1515  *  ---------
1516  *  GlobalMid_Lock protects:
1517  *      list operations on pending_mid_q and oplockQ
1518  *      updates to XID counters, multiplex id  and SMB sequence numbers
1519  *  cifs_file_list_lock protects:
1520  *      list operations on tcp and SMB session lists and tCon lists
1521  *  f_owner.lock protects certain per file struct operations
1522  *  mapping->page_lock protects certain per page operations
1523  *
1524  *  Semaphores
1525  *  ----------
1526  *  sesSem     operations on smb session
1527  *  tconSem    operations on tree connection
1528  *  fh_sem      file handle reconnection operations
1529  *
1530  ****************************************************************************/
1531 
1532 #ifdef DECLARE_GLOBALS_HERE
1533 #define GLOBAL_EXTERN
1534 #else
1535 #define GLOBAL_EXTERN extern
1536 #endif
1537 
1538 /*
1539  * the list of TCP_Server_Info structures, ie each of the sockets
1540  * connecting our client to a distinct server (ip address), is
1541  * chained together by cifs_tcp_ses_list. The list of all our SMB
1542  * sessions (and from that the tree connections) can be found
1543  * by iterating over cifs_tcp_ses_list
1544  */
1545 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1546 
1547 /*
1548  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1549  * tcp session, and the list of tcon's per smb session. It also protects
1550  * the reference counters for the server, smb session, and tcon. Finally,
1551  * changes to the tcon->tidStatus should be done while holding this lock.
1552  */
1553 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1554 
1555 /*
1556  * This lock protects the cifs_file->llist and cifs_file->flist
1557  * list operations, and updates to some flags (cifs_file->invalidHandle)
1558  * It will be moved to either use the tcon->stat_lock or equivalent later.
1559  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
1560  * the cifs_tcp_ses_lock must be grabbed first and released last.
1561  */
1562 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
1563 
1564 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1565 /* Outstanding dir notify requests */
1566 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1567 /* DirNotify response queue */
1568 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1569 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1570 
1571 /*
1572  * Global transaction id (XID) information
1573  */
1574 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1575 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1576 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1577 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1578                                           /* on midQ entries */
1579 /*
1580  *  Global counters, updated atomically
1581  */
1582 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1583 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1584 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1585 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1586 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1587 
1588 /* Various Debug counters */
1589 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1590 #ifdef CONFIG_CIFS_STATS2
1591 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1592 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1593 #endif
1594 GLOBAL_EXTERN atomic_t smBufAllocCount;
1595 GLOBAL_EXTERN atomic_t midCount;
1596 
1597 /* Misc globals */
1598 GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1599 GLOBAL_EXTERN bool lookupCacheEnabled;
1600 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1601                                 with more secure ntlmssp2 challenge/resp */
1602 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1603 GLOBAL_EXTERN bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1604 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1605 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1606 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1607 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1608 
1609 #ifdef CONFIG_CIFS_ACL
1610 GLOBAL_EXTERN struct rb_root uidtree;
1611 GLOBAL_EXTERN struct rb_root gidtree;
1612 GLOBAL_EXTERN spinlock_t siduidlock;
1613 GLOBAL_EXTERN spinlock_t sidgidlock;
1614 GLOBAL_EXTERN struct rb_root siduidtree;
1615 GLOBAL_EXTERN struct rb_root sidgidtree;
1616 GLOBAL_EXTERN spinlock_t uidsidlock;
1617 GLOBAL_EXTERN spinlock_t gidsidlock;
1618 #endif /* CONFIG_CIFS_ACL */
1619 
1620 void cifs_oplock_break(struct work_struct *work);
1621 
1622 extern const struct slow_work_ops cifs_oplock_break_ops;
1623 extern struct workqueue_struct *cifsiod_wq;
1624 
1625 extern mempool_t *cifs_mid_poolp;
1626 
1627 /* Operations for different SMB versions */
1628 #define SMB1_VERSION_STRING     "1.0"
1629 extern struct smb_version_operations smb1_operations;
1630 extern struct smb_version_values smb1_values;
1631 #define SMB20_VERSION_STRING    "2.0"
1632 extern struct smb_version_operations smb20_operations;
1633 extern struct smb_version_values smb20_values;
1634 #define SMB21_VERSION_STRING    "2.1"
1635 extern struct smb_version_operations smb21_operations;
1636 extern struct smb_version_values smb21_values;
1637 #define SMB30_VERSION_STRING    "3.0"
1638 extern struct smb_version_operations smb30_operations;
1639 extern struct smb_version_values smb30_values;
1640 #define SMB302_VERSION_STRING   "3.02"
1641 /*extern struct smb_version_operations smb302_operations;*/ /* not needed yet */
1642 extern struct smb_version_values smb302_values;
1643 #define SMB311_VERSION_STRING   "3.1.1"
1644 #define ALT_SMB311_VERSION_STRING "3.11"
1645 extern struct smb_version_operations smb311_operations;
1646 extern struct smb_version_values smb311_values;
1647 #endif  /* _CIFS_GLOB_H */
1648 

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