fs/cifs/cifsglob.h

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