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 #ifdef CONFIG_CIFS_SMB2
  32 #include "smb2pdu.h"
  33 #endif
  34
  35 #define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
  36
  37 /*
  38  * The sizes of various internal tables and strings
  39  */
  40 #define MAX_UID_INFO 16
  41 #define MAX_SES_INFO 2
  42 #define MAX_TCON_INFO 4
  43
  44 #define MAX_TREE_SIZE (2 + MAX_SERVER_SIZE + 1 + MAX_SHARE_SIZE + 1)
  45 #define MAX_SERVER_SIZE 15
  46 #define MAX_SHARE_SIZE 80
  47 #define MAX_USERNAME_SIZE 256   /* reasonable maximum for current servers */
  48 #define MAX_PASSWORD_SIZE 512   /* max for windows seems to be 256 wide chars */
  49
  50 #define CIFS_MIN_RCV_POOL 4
  51
  52 #define MAX_REOPEN_ATT  5 /* these many maximum attempts to reopen a file */
  53 /*
  54  * default attribute cache timeout (jiffies)
  55  */
  56 #define CIFS_DEF_ACTIMEO (1 * HZ)
  57
  58 /*
  59  * max attribute cache timeout (jiffies) - 2^30
  60  */
  61 #define CIFS_MAX_ACTIMEO (1 << 30)
  62
  63 /*
  64  * MAX_REQ is the maximum number of requests that WE will send
  65  * on one socket concurrently.
  66  */
  67 #define CIFS_MAX_REQ 32767
  68
  69 #define RFC1001_NAME_LEN 15
  70 #define RFC1001_NAME_LEN_WITH_NULL (RFC1001_NAME_LEN + 1)
  71
  72 /* currently length of NIP6_FMT */
  73 #define SERVER_NAME_LENGTH 40
  74 #define SERVER_NAME_LEN_WITH_NULL     (SERVER_NAME_LENGTH + 1)
  75
  76 /* used to define string lengths for reversing unicode strings */
  77 /*         (256+1)*2 = 514                                     */
  78 /*           (max path length + 1 for null) * 2 for unicode    */
  79 #define MAX_NAME 514
  80
  81 /* SMB echo "timeout" -- FIXME: tunable? */
  82 #define SMB_ECHO_INTERVAL (60 * HZ)
  83
  84 #include "cifspdu.h"
  85
  86 #ifndef XATTR_DOS_ATTRIB
  87 #define XATTR_DOS_ATTRIB "user.DOSATTRIB"
  88 #endif
  89
  90 /*
  91  * CIFS vfs client Status information (based on what we know.)
  92  */
  93
  94 /* associated with each tcp and smb session */
  95 enum statusEnum {
  96         CifsNew = 0,
  97         CifsGood,
  98         CifsExiting,
  99         CifsNeedReconnect,
 100         CifsNeedNegotiate
 101 };
 102
 103 enum securityEnum {
 104         LANMAN = 0,                     /* Legacy LANMAN auth */
 105         NTLM,                   /* Legacy NTLM012 auth with NTLM hash */
 106         NTLMv2,                 /* Legacy NTLM auth with NTLMv2 hash */
 107         RawNTLMSSP,             /* NTLMSSP without SPNEGO, NTLMv2 hash */
 108 /*      NTLMSSP, */ /* can use rawNTLMSSP instead of NTLMSSP via SPNEGO */
 109         Kerberos,               /* Kerberos via SPNEGO */
 110 };
 111
 112 enum protocolEnum {
 113         TCP = 0,
 114         SCTP
 115         /* Netbios frames protocol not supported at this time */
 116 };
 117
 118 struct session_key {
 119         unsigned int len;
 120         char *response;
 121 };
 122
 123 /* crypto security descriptor definition */
 124 struct sdesc {
 125         struct shash_desc shash;
 126         char ctx[];
 127 };
 128
 129 /* crypto hashing related structure/fields, not specific to a sec mech */
 130 struct cifs_secmech {
 131         struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
 132         struct crypto_shash *md5; /* md5 hash function */
 133         struct crypto_shash *hmacsha256; /* hmac-sha256 hash function */
 134         struct sdesc *sdeschmacmd5;  /* ctxt to generate ntlmv2 hash, CR1 */
 135         struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
 136         struct sdesc *sdeschmacsha256;  /* ctxt to generate smb2 signature */
 137 };
 138
 139 /* per smb session structure/fields */
 140 struct ntlmssp_auth {
 141         __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 142         __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 143         unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
 144         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlmssp */
 145 };
 146
 147 struct cifs_cred {
 148         int uid;
 149         int gid;
 150         int mode;
 151         int cecount;
 152         struct cifs_sid osid;
 153         struct cifs_sid gsid;
 154         struct cifs_ntace *ntaces;
 155         struct cifs_ace *aces;
 156 };
 157
 158 /*
 159  *****************************************************************
 160  * Except the CIFS PDUs themselves all the
 161  * globally interesting structs should go here
 162  *****************************************************************
 163  */
 164
 165 /*
 166  * A smb_rqst represents a complete request to be issued to a server. It's
 167  * formed by a kvec array, followed by an array of pages. Page data is assumed
 168  * to start at the beginning of the first page.
 169  */
 170 struct smb_rqst {
 171         struct kvec     *rq_iov;        /* array of kvecs */
 172         unsigned int    rq_nvec;        /* number of kvecs in array */
 173         struct page     **rq_pages;     /* pointer to array of page ptrs */
 174         unsigned int    rq_npages;      /* number pages in array */
 175         unsigned int    rq_pagesz;      /* page size to use */
 176         unsigned int    rq_tailsz;      /* length of last page */
 177 };
 178
 179 enum smb_version {
 180         Smb_1 = 1,
 181         Smb_20,
 182         Smb_21,
 183         Smb_30,
 184 };
 185
 186 struct mid_q_entry;
 187 struct TCP_Server_Info;
 188 struct cifsFileInfo;
 189 struct cifs_ses;
 190 struct cifs_tcon;
 191 struct dfs_info3_param;
 192 struct cifs_fattr;
 193 struct smb_vol;
 194 struct cifs_fid;
 195 struct cifs_readdata;
 196 struct cifs_writedata;
 197 struct cifs_io_parms;
 198 struct cifs_search_info;
 199 struct cifsInodeInfo;
 200
 201 struct smb_version_operations {
 202         int (*send_cancel)(struct TCP_Server_Info *, void *,
 203                            struct mid_q_entry *);
 204         bool (*compare_fids)(struct cifsFileInfo *, struct cifsFileInfo *);
 205         /* setup request: allocate mid, sign message */
 206         struct mid_q_entry *(*setup_request)(struct cifs_ses *,
 207                                                 struct smb_rqst *);
 208         /* setup async request: allocate mid, sign message */
 209         struct mid_q_entry *(*setup_async_request)(struct TCP_Server_Info *,
 210                                                 struct smb_rqst *);
 211         /* check response: verify signature, map error */
 212         int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 213                              bool);
 214         void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
 215                             const int);
 216         void (*set_credits)(struct TCP_Server_Info *, const int);
 217         int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 218         unsigned int (*get_credits)(struct mid_q_entry *);
 219         __u64 (*get_next_mid)(struct TCP_Server_Info *);
 220         /* data offset from read response message */
 221         unsigned int (*read_data_offset)(char *);
 222         /* data length from read response message */
 223         unsigned int (*read_data_length)(char *);
 224         /* map smb to linux error */
 225         int (*map_error)(char *, bool);
 226         /* find mid corresponding to the response message */
 227         struct mid_q_entry * (*find_mid)(struct TCP_Server_Info *, char *);
 228         void (*dump_detail)(void *);
 229         void (*clear_stats)(struct cifs_tcon *);
 230         void (*print_stats)(struct seq_file *m, struct cifs_tcon *);
 231         /* verify the message */
 232         int (*check_message)(char *, unsigned int);
 233         bool (*is_oplock_break)(char *, struct TCP_Server_Info *);
 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 *);
 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         /* check if we can send an echo or nor */
 285         bool (*can_echo)(struct TCP_Server_Info *);
 286         /* send echo request */
 287         int (*echo)(struct TCP_Server_Info *);
 288         /* create directory */
 289         int (*mkdir)(const unsigned int, struct cifs_tcon *, const char *,
 290                      struct cifs_sb_info *);
 291         /* set info on created directory */
 292         void (*mkdir_setinfo)(struct inode *, const char *,
 293                               struct cifs_sb_info *, struct cifs_tcon *,
 294                               const unsigned int);
 295         /* remove directory */
 296         int (*rmdir)(const unsigned int, struct cifs_tcon *, const char *,
 297                      struct cifs_sb_info *);
 298         /* unlink file */
 299         int (*unlink)(const unsigned int, struct cifs_tcon *, const char *,
 300                       struct cifs_sb_info *);
 301         /* open, rename and delete file */
 302         int (*rename_pending_delete)(const char *, struct dentry *,
 303                                      const unsigned int);
 304         /* send rename request */
 305         int (*rename)(const unsigned int, struct cifs_tcon *, const char *,
 306                       const char *, struct cifs_sb_info *);
 307         /* send create hardlink request */
 308         int (*create_hardlink)(const unsigned int, struct cifs_tcon *,
 309                                const char *, const char *,
 310                                struct cifs_sb_info *);
 311         /* open a file for non-posix mounts */
 312         int (*open)(const unsigned int, struct cifs_tcon *, const char *, int,
 313                     int, int, struct cifs_fid *, __u32 *, FILE_ALL_INFO *,
 314                     struct cifs_sb_info *);
 315         /* set fid protocol-specific info */
 316         void (*set_fid)(struct cifsFileInfo *, struct cifs_fid *, __u32);
 317         /* close a file */
 318         void (*close)(const unsigned int, struct cifs_tcon *,
 319                       struct cifs_fid *);
 320         /* send a flush request to the server */
 321         int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
 322         /* async read from the server */
 323         int (*async_readv)(struct cifs_readdata *);
 324         /* async write to the server */
 325         int (*async_writev)(struct cifs_writedata *);
 326         /* sync read from the server */
 327         int (*sync_read)(const unsigned int, struct cifsFileInfo *,
 328                          struct cifs_io_parms *, unsigned int *, char **,
 329                          int *);
 330         /* sync write to the server */
 331         int (*sync_write)(const unsigned int, struct cifsFileInfo *,
 332                           struct cifs_io_parms *, unsigned int *, struct kvec *,
 333                           unsigned long);
 334         /* open dir, start readdir */
 335         int (*query_dir_first)(const unsigned int, struct cifs_tcon *,
 336                                const char *, struct cifs_sb_info *,
 337                                struct cifs_fid *, __u16,
 338                                struct cifs_search_info *);
 339         /* continue readdir */
 340         int (*query_dir_next)(const unsigned int, struct cifs_tcon *,
 341                               struct cifs_fid *,
 342                               __u16, struct cifs_search_info *srch_inf);
 343         /* close dir */
 344         int (*close_dir)(const unsigned int, struct cifs_tcon *,
 345                          struct cifs_fid *);
 346         /* calculate a size of SMB message */
 347         unsigned int (*calc_smb_size)(void *);
 348         /* check for STATUS_PENDING and process it in a positive case */
 349         bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
 350         /* send oplock break response */
 351         int (*oplock_response)(struct cifs_tcon *, struct cifs_fid *,
 352                                struct cifsInodeInfo *);
 353         /* query remote filesystem */
 354         int (*queryfs)(const unsigned int, struct cifs_tcon *,
 355                        struct kstatfs *);
 356         /* send mandatory brlock to the server */
 357         int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
 358                          __u64, __u32, int, int, bool);
 359         /* unlock range of mandatory locks */
 360         int (*mand_unlock_range)(struct cifsFileInfo *, struct file_lock *,
 361                                  const unsigned int);
 362         /* push brlocks from the cache to the server */
 363         int (*push_mand_locks)(struct cifsFileInfo *);
 364         /* get lease key of the inode */
 365         void (*get_lease_key)(struct inode *, struct cifs_fid *fid);
 366         /* set lease key of the inode */
 367         void (*set_lease_key)(struct inode *, struct cifs_fid *fid);
 368         /* generate new lease key */
 369         void (*new_lease_key)(struct cifs_fid *fid);
 370         int (*calc_signature)(struct smb_rqst *rqst,
 371                                    struct TCP_Server_Info *server);
 372 };
 373
 374 struct smb_version_values {
 375         char            *version_string;
 376         __u16           protocol_id;
 377         __u32           req_capabilities;
 378         __u32           large_lock_type;
 379         __u32           exclusive_lock_type;
 380         __u32           shared_lock_type;
 381         __u32           unlock_lock_type;
 382         size_t          header_size;
 383         size_t          max_header_size;
 384         size_t          read_rsp_size;
 385         __le16          lock_cmd;
 386         unsigned int    cap_unix;
 387         unsigned int    cap_nt_find;
 388         unsigned int    cap_large_files;
 389         unsigned int    oplock_read;
 390 };
 391
 392 #define HEADER_SIZE(server) (server->vals->header_size)
 393 #define MAX_HEADER_SIZE(server) (server->vals->max_header_size)
 394
 395 struct smb_vol {
 396         char *username;
 397         char *password;
 398         char *domainname;
 399         char *UNC;
 400         char *iocharset;  /* local code page for mapping to and from Unicode */
 401         char source_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* clnt nb name */
 402         char target_rfc1001_name[RFC1001_NAME_LEN_WITH_NULL]; /* srvr nb name */
 403         kuid_t cred_uid;
 404         kuid_t linux_uid;
 405         kgid_t linux_gid;
 406         kuid_t backupuid;
 407         kgid_t backupgid;
 408         umode_t file_mode;
 409         umode_t dir_mode;
 410         unsigned secFlg;
 411         bool retry:1;
 412         bool intr:1;
 413         bool setuids:1;
 414         bool override_uid:1;
 415         bool override_gid:1;
 416         bool dynperm:1;
 417         bool noperm:1;
 418         bool no_psx_acl:1; /* set if posix acl support should be disabled */
 419         bool cifs_acl:1;
 420         bool backupuid_specified; /* mount option  backupuid  is specified */
 421         bool backupgid_specified; /* mount option  backupgid  is specified */
 422         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
 423         bool server_ino:1; /* use inode numbers from server ie UniqueId */
 424         bool direct_io:1;
 425         bool strict_io:1; /* strict cache behavior */
 426         bool remap:1;      /* set to remap seven reserved chars in filenames */
 427         bool posix_paths:1; /* unset to not ask for posix pathnames. */
 428         bool no_linux_ext:1;
 429         bool sfu_emul:1;
 430         bool nullauth:1;   /* attempt to authenticate with null user */
 431         bool nocase:1;     /* request case insensitive filenames */
 432         bool nobrl:1;      /* disable sending byte range locks to srv */
 433         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
 434         bool seal:1;       /* request transport encryption on share */
 435         bool nodfs:1;      /* Do not request DFS, even if available */
 436         bool local_lease:1; /* check leases only on local system, not remote */
 437         bool noblocksnd:1;
 438         bool noautotune:1;
 439         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 440         bool fsc:1;     /* enable fscache */
 441         bool mfsymlinks:1; /* use Minshall+French Symlinks */
 442         bool multiuser:1;
 443         bool rwpidforward:1; /* pid forward for read/write operations */
 444         unsigned int rsize;
 445         unsigned int wsize;
 446         bool sockopt_tcp_nodelay:1;
 447         unsigned long actimeo; /* attribute cache timeout (jiffies) */
 448         struct smb_version_operations *ops;
 449         struct smb_version_values *vals;
 450         char *prepath;
 451         struct sockaddr_storage dstaddr; /* destination address */
 452         struct sockaddr_storage srcaddr; /* allow binding to a local IP */
 453         struct nls_table *local_nls;
 454 };
 455
 456 #define CIFS_MOUNT_MASK (CIFS_MOUNT_NO_PERM | CIFS_MOUNT_SET_UID | \
 457                          CIFS_MOUNT_SERVER_INUM | CIFS_MOUNT_DIRECT_IO | \
 458                          CIFS_MOUNT_NO_XATTR | CIFS_MOUNT_MAP_SPECIAL_CHR | \
 459                          CIFS_MOUNT_UNX_EMUL | CIFS_MOUNT_NO_BRL | \
 460                          CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_OVERR_UID | \
 461                          CIFS_MOUNT_OVERR_GID | CIFS_MOUNT_DYNPERM | \
 462                          CIFS_MOUNT_NOPOSIXBRL | CIFS_MOUNT_NOSSYNC | \
 463                          CIFS_MOUNT_FSCACHE | CIFS_MOUNT_MF_SYMLINKS | \
 464                          CIFS_MOUNT_MULTIUSER | CIFS_MOUNT_STRICT_IO | \
 465                          CIFS_MOUNT_CIFS_BACKUPUID | CIFS_MOUNT_CIFS_BACKUPGID)
 466
 467 #define CIFS_MS_MASK (MS_RDONLY | MS_MANDLOCK | MS_NOEXEC | MS_NOSUID | \
 468                       MS_NODEV | MS_SYNCHRONOUS)
 469
 470 struct cifs_mnt_data {
 471         struct cifs_sb_info *cifs_sb;
 472         struct smb_vol *vol;
 473         int flags;
 474 };
 475
 476 static inline unsigned int
 477 get_rfc1002_length(void *buf)
 478 {
 479         return be32_to_cpu(*((__be32 *)buf));
 480 }
 481
 482 static inline void
 483 inc_rfc1001_len(void *buf, int count)
 484 {
 485         be32_add_cpu((__be32 *)buf, count);
 486 }
 487
 488 struct TCP_Server_Info {
 489         struct list_head tcp_ses_list;
 490         struct list_head smb_ses_list;
 491         int srv_count; /* reference counter */
 492         /* 15 character server name + 0x20 16th byte indicating type = srv */
 493         char server_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 494         struct smb_version_operations   *ops;
 495         struct smb_version_values       *vals;
 496         enum statusEnum tcpStatus; /* what we think the status is */
 497         char *hostname; /* hostname portion of UNC string */
 498         struct socket *ssocket;
 499         struct sockaddr_storage dstaddr;
 500         struct sockaddr_storage srcaddr; /* locally bind to this IP */
 501 #ifdef CONFIG_NET_NS
 502         struct net *net;
 503 #endif
 504         wait_queue_head_t response_q;
 505         wait_queue_head_t request_q; /* if more than maxmpx to srvr must block*/
 506         struct list_head pending_mid_q;
 507         bool noblocksnd;                /* use blocking sendmsg */
 508         bool noautotune;                /* do not autotune send buf sizes */
 509         bool tcp_nodelay;
 510         int credits;  /* send no more requests at once */
 511         unsigned int in_flight;  /* number of requests on the wire to server */
 512         spinlock_t req_lock;  /* protect the two values above */
 513         struct mutex srv_mutex;
 514         struct task_struct *tsk;
 515         char server_GUID[16];
 516         __u16 sec_mode;
 517         bool session_estab; /* mark when very first sess is established */
 518 #ifdef CONFIG_CIFS_SMB2
 519         int echo_credits;  /* echo reserved slots */
 520         int oplock_credits;  /* oplock break reserved slots */
 521         bool echoes:1; /* enable echoes */
 522 #endif
 523         u16 dialect; /* dialect index that server chose */
 524         enum securityEnum secType;
 525         bool oplocks:1; /* enable oplocks */
 526         unsigned int maxReq;    /* Clients should submit no more */
 527         /* than maxReq distinct unanswered SMBs to the server when using  */
 528         /* multiplexed reads or writes */
 529         unsigned int maxBuf;    /* maxBuf specifies the maximum */
 530         /* message size the server can send or receive for non-raw SMBs */
 531         /* maxBuf is returned by SMB NegotiateProtocol so maxBuf is only 0 */
 532         /* when socket is setup (and during reconnect) before NegProt sent */
 533         unsigned int max_rw;    /* maxRw specifies the maximum */
 534         /* message size the server can send or receive for */
 535         /* SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. */
 536         unsigned int max_vcs;   /* maximum number of smb sessions, at least
 537                                    those that can be specified uniquely with
 538                                    vcnumbers */
 539         unsigned int capabilities; /* selective disabling of caps by smb sess */
 540         int timeAdj;  /* Adjust for difference in server time zone in sec */
 541         __u64 CurrentMid;         /* multiplex id - rotating counter */
 542         char cryptkey[CIFS_CRYPTO_KEY_SIZE]; /* used by ntlm, ntlmv2 etc */
 543         /* 16th byte of RFC1001 workstation name is always null */
 544         char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
 545         __u32 sequence_number; /* for signing, protected by srv_mutex */
 546         struct session_key session_key;
 547         unsigned long lstrp; /* when we got last response from this server */
 548         struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
 549         /* extended security flavors that server supports */
 550         bool    sec_ntlmssp;            /* supports NTLMSSP */
 551         bool    sec_kerberosu2u;        /* supports U2U Kerberos */
 552         bool    sec_kerberos;           /* supports plain Kerberos */
 553         bool    sec_mskerberos;         /* supports legacy MS Kerberos */
 554         bool    large_buf;              /* is current buffer large? */
 555         struct delayed_work     echo; /* echo ping workqueue job */
 556         struct kvec *iov;       /* reusable kvec array for receives */
 557         unsigned int nr_iov;    /* number of kvecs in array */
 558         char    *smallbuf;      /* pointer to current "small" buffer */
 559         char    *bigbuf;        /* pointer to current "big" buffer */
 560         unsigned int total_read; /* total amount of data read in this pass */
 561 #ifdef CONFIG_CIFS_FSCACHE
 562         struct fscache_cookie   *fscache; /* client index cache cookie */
 563 #endif
 564 #ifdef CONFIG_CIFS_STATS2
 565         atomic_t in_send; /* requests trying to send */
 566         atomic_t num_waiters;   /* blocked waiting to get in sendrecv */
 567 #endif
 568 #ifdef CONFIG_CIFS_SMB2
 569         unsigned int    max_read;
 570         unsigned int    max_write;
 571 #endif /* CONFIG_CIFS_SMB2 */
 572 };
 573
 574 static inline unsigned int
 575 in_flight(struct TCP_Server_Info *server)
 576 {
 577         unsigned int num;
 578         spin_lock(&server->req_lock);
 579         num = server->in_flight;
 580         spin_unlock(&server->req_lock);
 581         return num;
 582 }
 583
 584 static inline bool
 585 has_credits(struct TCP_Server_Info *server, int *credits)
 586 {
 587         int num;
 588         spin_lock(&server->req_lock);
 589         num = *credits;
 590         spin_unlock(&server->req_lock);
 591         return num > 0;
 592 }
 593
 594 static inline void
 595 add_credits(struct TCP_Server_Info *server, const unsigned int add,
 596             const int optype)
 597 {
 598         server->ops->add_credits(server, add, optype);
 599 }
 600
 601 static inline void
 602 set_credits(struct TCP_Server_Info *server, const int val)
 603 {
 604         server->ops->set_credits(server, val);
 605 }
 606
 607 static inline __u64
 608 get_next_mid(struct TCP_Server_Info *server)
 609 {
 610         return server->ops->get_next_mid(server);
 611 }
 612
 613 /*
 614  * When the server supports very large reads and writes via POSIX extensions,
 615  * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
 616  * including the RFC1001 length.
 617  *
 618  * Note that this might make for "interesting" allocation problems during
 619  * writeback however as we have to allocate an array of pointers for the
 620  * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
 621  *
 622  * For reads, there is a similar problem as we need to allocate an array
 623  * of kvecs to handle the receive, though that should only need to be done
 624  * once.
 625  */
 626 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
 627 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
 628
 629 /*
 630  * When the server doesn't allow large posix writes, only allow a rsize/wsize
 631  * of 2^17-1 minus the size of the call header. That allows for a read or
 632  * write up to the maximum size described by RFC1002.
 633  */
 634 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
 635 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
 636
 637 /*
 638  * The default wsize is 1M. find_get_pages seems to return a maximum of 256
 639  * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
 640  * a single wsize request with a single call.
 641  */
 642 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
 643
 644 /*
 645  * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
 646  * those values when posix extensions aren't in force. In actuality here, we
 647  * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
 648  * to be ok with the extra byte even though Windows doesn't send writes that
 649  * are that large.
 650  *
 651  * Citation:
 652  *
 653  * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
 654  */
 655 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
 656 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
 657
 658 /*
 659  * Macros to allow the TCP_Server_Info->net field and related code to drop out
 660  * when CONFIG_NET_NS isn't set.
 661  */
 662
 663 #ifdef CONFIG_NET_NS
 664
 665 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 666 {
 667         return srv->net;
 668 }
 669
 670 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 671 {
 672         srv->net = net;
 673 }
 674
 675 #else
 676
 677 static inline struct net *cifs_net_ns(struct TCP_Server_Info *srv)
 678 {
 679         return &init_net;
 680 }
 681
 682 static inline void cifs_set_net_ns(struct TCP_Server_Info *srv, struct net *net)
 683 {
 684 }
 685
 686 #endif
 687
 688 /*
 689  * Session structure.  One of these for each uid session with a particular host
 690  */
 691 struct cifs_ses {
 692         struct list_head smb_ses_list;
 693         struct list_head tcon_list;
 694         struct mutex session_mutex;
 695         struct TCP_Server_Info *server; /* pointer to server info */
 696         int ses_count;          /* reference counter */
 697         enum statusEnum status;
 698         unsigned overrideSecFlg;  /* if non-zero override global sec flags */
 699         __u16 ipc_tid;          /* special tid for connection to IPC share */
 700         __u16 flags;
 701         __u16 vcnum;
 702         char *serverOS;         /* name of operating system underlying server */
 703         char *serverNOS;        /* name of network operating system of server */
 704         char *serverDomain;     /* security realm of server */
 705         __u64 Suid;             /* remote smb uid  */
 706         kuid_t linux_uid;       /* overriding owner of files on the mount */
 707         kuid_t cred_uid;        /* owner of credentials */
 708         unsigned int capabilities;
 709         char serverName[SERVER_NAME_LEN_WITH_NULL * 2]; /* BB make bigger for
 710                                 TCP names - will ipv6 and sctp addresses fit? */
 711         char *user_name;        /* must not be null except during init of sess
 712                                    and after mount option parsing we fill it */
 713         char *domainName;
 714         char *password;
 715         struct session_key auth_key;
 716         struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
 717         bool need_reconnect:1; /* connection reset, uid now invalid */
 718 #ifdef CONFIG_CIFS_SMB2
 719         __u16 session_flags;
 720 #endif /* CONFIG_CIFS_SMB2 */
 721 };
 722
 723 /* no more than one of the following three session flags may be set */
 724 #define CIFS_SES_NT4 1
 725 #define CIFS_SES_OS2 2
 726 #define CIFS_SES_W9X 4
 727 /* following flag is set for old servers such as OS2 (and Win95?)
 728    which do not negotiate NTLM or POSIX dialects, but instead
 729    negotiate one of the older LANMAN dialects */
 730 #define CIFS_SES_LANMAN 8
 731
 732 static inline bool
 733 cap_unix(struct cifs_ses *ses)
 734 {
 735         return ses->server->vals->cap_unix & ses->capabilities;
 736 }
 737
 738 /*
 739  * there is one of these for each connection to a resource on a particular
 740  * session
 741  */
 742 struct cifs_tcon {
 743         struct list_head tcon_list;
 744         int tc_count;
 745         struct list_head openFileList;
 746         struct cifs_ses *ses;   /* pointer to session associated with */
 747         char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
 748         char *nativeFileSystem;
 749         char *password;         /* for share-level security */
 750         __u32 tid;              /* The 4 byte tree id */
 751         __u16 Flags;            /* optional support bits */
 752         enum statusEnum tidStatus;
 753 #ifdef CONFIG_CIFS_STATS
 754         atomic_t num_smbs_sent;
 755         union {
 756                 struct {
 757                         atomic_t num_writes;
 758                         atomic_t num_reads;
 759                         atomic_t num_flushes;
 760                         atomic_t num_oplock_brks;
 761                         atomic_t num_opens;
 762                         atomic_t num_closes;
 763                         atomic_t num_deletes;
 764                         atomic_t num_mkdirs;
 765                         atomic_t num_posixopens;
 766                         atomic_t num_posixmkdirs;
 767                         atomic_t num_rmdirs;
 768                         atomic_t num_renames;
 769                         atomic_t num_t2renames;
 770                         atomic_t num_ffirst;
 771                         atomic_t num_fnext;
 772                         atomic_t num_fclose;
 773                         atomic_t num_hardlinks;
 774                         atomic_t num_symlinks;
 775                         atomic_t num_locks;
 776                         atomic_t num_acl_get;
 777                         atomic_t num_acl_set;
 778                 } cifs_stats;
 779 #ifdef CONFIG_CIFS_SMB2
 780                 struct {
 781                         atomic_t smb2_com_sent[NUMBER_OF_SMB2_COMMANDS];
 782                         atomic_t smb2_com_failed[NUMBER_OF_SMB2_COMMANDS];
 783                 } smb2_stats;
 784 #endif /* CONFIG_CIFS_SMB2 */
 785         } stats;
 786 #ifdef CONFIG_CIFS_STATS2
 787         unsigned long long time_writes;
 788         unsigned long long time_reads;
 789         unsigned long long time_opens;
 790         unsigned long long time_deletes;
 791         unsigned long long time_closes;
 792         unsigned long long time_mkdirs;
 793         unsigned long long time_rmdirs;
 794         unsigned long long time_renames;
 795         unsigned long long time_t2renames;
 796         unsigned long long time_ffirst;
 797         unsigned long long time_fnext;
 798         unsigned long long time_fclose;
 799 #endif /* CONFIG_CIFS_STATS2 */
 800         __u64    bytes_read;
 801         __u64    bytes_written;
 802         spinlock_t stat_lock;
 803 #endif /* CONFIG_CIFS_STATS */
 804         FILE_SYSTEM_DEVICE_INFO fsDevInfo;
 805         FILE_SYSTEM_ATTRIBUTE_INFO fsAttrInfo; /* ok if fs name truncated */
 806         FILE_SYSTEM_UNIX_INFO fsUnixInfo;
 807         bool ipc:1;             /* set if connection to IPC$ eg for RPC/PIPES */
 808         bool retry:1;
 809         bool nocase:1;
 810         bool seal:1;      /* transport encryption for this mounted share */
 811         bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 812                                 for this mount even if server would support */
 813         bool local_lease:1; /* check leases (only) on local system not remote */
 814         bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */
 815         bool need_reconnect:1; /* connection reset, tid now invalid */
 816 #ifdef CONFIG_CIFS_SMB2
 817         bool print:1;           /* set if connection to printer share */
 818         bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */
 819         __u32 capabilities;
 820         __u32 share_flags;
 821         __u32 maximal_access;
 822         __u32 vol_serial_number;
 823         __le64 vol_create_time;
 824 #endif /* CONFIG_CIFS_SMB2 */
 825 #ifdef CONFIG_CIFS_FSCACHE
 826         u64 resource_id;                /* server resource id */
 827         struct fscache_cookie *fscache; /* cookie for share */
 828 #endif
 829         struct list_head pending_opens; /* list of incomplete opens */
 830         /* BB add field for back pointer to sb struct(s)? */
 831 };
 832
 833 /*
 834  * This is a refcounted and timestamped container for a tcon pointer. The
 835  * container holds a tcon reference. It is considered safe to free one of
 836  * these when the tl_count goes to 0. The tl_time is the time of the last
 837  * "get" on the container.
 838  */
 839 struct tcon_link {
 840         struct rb_node          tl_rbnode;
 841         kuid_t                  tl_uid;
 842         unsigned long           tl_flags;
 843 #define TCON_LINK_MASTER        0
 844 #define TCON_LINK_PENDING       1
 845 #define TCON_LINK_IN_TREE       2
 846         unsigned long           tl_time;
 847         atomic_t                tl_count;
 848         struct cifs_tcon        *tl_tcon;
 849 };
 850
 851 extern struct tcon_link *cifs_sb_tlink(struct cifs_sb_info *cifs_sb);
 852
 853 static inline struct cifs_tcon *
 854 tlink_tcon(struct tcon_link *tlink)
 855 {
 856         return tlink->tl_tcon;
 857 }
 858
 859 extern void cifs_put_tlink(struct tcon_link *tlink);
 860
 861 static inline struct tcon_link *
 862 cifs_get_tlink(struct tcon_link *tlink)
 863 {
 864         if (tlink && !IS_ERR(tlink))
 865                 atomic_inc(&tlink->tl_count);
 866         return tlink;
 867 }
 868
 869 /* This function is always expected to succeed */
 870 extern struct cifs_tcon *cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb);
 871
 872 #define CIFS_OPLOCK_NO_CHANGE 0xfe
 873
 874 struct cifs_pending_open {
 875         struct list_head olist;
 876         struct tcon_link *tlink;
 877         __u8 lease_key[16];
 878         __u32 oplock;
 879 };
 880
 881 /*
 882  * This info hangs off the cifsFileInfo structure, pointed to by llist.
 883  * This is used to track byte stream locks on the file
 884  */
 885 struct cifsLockInfo {
 886         struct list_head llist; /* pointer to next cifsLockInfo */
 887         struct list_head blist; /* pointer to locks blocked on this */
 888         wait_queue_head_t block_q;
 889         __u64 offset;
 890         __u64 length;
 891         __u32 pid;
 892         __u32 type;
 893 };
 894
 895 /*
 896  * One of these for each open instance of a file
 897  */
 898 struct cifs_search_info {
 899         loff_t index_of_last_entry;
 900         __u16 entries_in_buffer;
 901         __u16 info_level;
 902         __u32 resume_key;
 903         char *ntwrk_buf_start;
 904         char *srch_entries_start;
 905         char *last_entry;
 906         const char *presume_name;
 907         unsigned int resume_name_len;
 908         bool endOfSearch:1;
 909         bool emptyDir:1;
 910         bool unicode:1;
 911         bool smallBuf:1; /* so we know which buf_release function to call */
 912 };
 913
 914 struct cifs_fid {
 915         __u16 netfid;
 916 #ifdef CONFIG_CIFS_SMB2
 917         __u64 persistent_fid;   /* persist file id for smb2 */
 918         __u64 volatile_fid;     /* volatile file id for smb2 */
 919         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for smb2 */
 920 #endif
 921         struct cifs_pending_open *pending_open;
 922 };
 923
 924 struct cifs_fid_locks {
 925         struct list_head llist;
 926         struct cifsFileInfo *cfile;     /* fid that owns locks */
 927         struct list_head locks;         /* locks held by fid above */
 928 };
 929
 930 struct cifsFileInfo {
 931         struct list_head tlist; /* pointer to next fid owned by tcon */
 932         struct list_head flist; /* next fid (file instance) for this inode */
 933         struct cifs_fid_locks *llist;   /* brlocks held by this fid */
 934         kuid_t uid;             /* allows finding which FileInfo structure */
 935         __u32 pid;              /* process id who opened file */
 936         struct cifs_fid fid;    /* file id from remote */
 937         /* BB add lock scope info here if needed */ ;
 938         /* lock scope id (0 if none) */
 939         struct dentry *dentry;
 940         unsigned int f_flags;
 941         struct tcon_link *tlink;
 942         bool invalidHandle:1;   /* file closed via session abend */
 943         bool oplock_break_cancelled:1;
 944         int count;              /* refcount protected by cifs_file_list_lock */
 945         struct mutex fh_mutex; /* prevents reopen race after dead ses*/
 946         struct cifs_search_info srch_inf;
 947         struct work_struct oplock_break; /* work for oplock breaks */
 948 };
 949
 950 struct cifs_io_parms {
 951         __u16 netfid;
 952 #ifdef CONFIG_CIFS_SMB2
 953         __u64 persistent_fid;   /* persist file id for smb2 */
 954         __u64 volatile_fid;     /* volatile file id for smb2 */
 955 #endif
 956         __u32 pid;
 957         __u64 offset;
 958         unsigned int length;
 959         struct cifs_tcon *tcon;
 960 };
 961
 962 struct cifs_readdata;
 963
 964 /* asynchronous read support */
 965 struct cifs_readdata {
 966         struct kref                     refcount;
 967         struct list_head                list;
 968         struct completion               done;
 969         struct cifsFileInfo             *cfile;
 970         struct address_space            *mapping;
 971         __u64                           offset;
 972         unsigned int                    bytes;
 973         pid_t                           pid;
 974         int                             result;
 975         struct work_struct              work;
 976         int (*read_into_pages)(struct TCP_Server_Info *server,
 977                                 struct cifs_readdata *rdata,
 978                                 unsigned int len);
 979         struct kvec                     iov;
 980         unsigned int                    pagesz;
 981         unsigned int                    tailsz;
 982         unsigned int                    nr_pages;
 983         struct page                     *pages[];
 984 };
 985
 986 struct cifs_writedata;
 987
 988 /* asynchronous write support */
 989 struct cifs_writedata {
 990         struct kref                     refcount;
 991         struct list_head                list;
 992         struct completion               done;
 993         enum writeback_sync_modes       sync_mode;
 994         struct work_struct              work;
 995         struct cifsFileInfo             *cfile;
 996         __u64                           offset;
 997         pid_t                           pid;
 998         unsigned int                    bytes;
 999         int                             result;
1000         unsigned int                    pagesz;
1001         unsigned int                    tailsz;
1002         unsigned int                    nr_pages;
1003         struct page                     *pages[1];
1004 };
1005
1006 /*
1007  * Take a reference on the file private data. Must be called with
1008  * cifs_file_list_lock held.
1009  */
1010 static inline void
1011 cifsFileInfo_get_locked(struct cifsFileInfo *cifs_file)
1012 {
1013         ++cifs_file->count;
1014 }
1015
1016 struct cifsFileInfo *cifsFileInfo_get(struct cifsFileInfo *cifs_file);
1017 void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
1018
1019 /*
1020  * One of these for each file inode
1021  */
1022
1023 struct cifsInodeInfo {
1024         bool can_cache_brlcks;
1025         struct list_head llist; /* locks helb by this inode */
1026         struct rw_semaphore lock_sem;   /* protect the fields above */
1027         /* BB add in lists for dirty pages i.e. write caching info for oplock */
1028         struct list_head openFileList;
1029         __u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
1030         bool clientCanCacheRead;        /* read oplock */
1031         bool clientCanCacheAll;         /* read and writebehind oplock */
1032         bool delete_pending;            /* DELETE_ON_CLOSE is set */
1033         bool invalid_mapping;           /* pagecache is invalid */
1034         unsigned long time;             /* jiffies of last update of inode */
1035         u64  server_eof;                /* current file size on server -- protected by i_lock */
1036         u64  uniqueid;                  /* server inode number */
1037         u64  createtime;                /* creation time on server */
1038 #ifdef CONFIG_CIFS_SMB2
1039         __u8 lease_key[SMB2_LEASE_KEY_SIZE];    /* lease key for this inode */
1040 #endif
1041 #ifdef CONFIG_CIFS_FSCACHE
1042         struct fscache_cookie *fscache;
1043 #endif
1044         struct inode vfs_inode;
1045 };
1046
1047 static inline struct cifsInodeInfo *
1048 CIFS_I(struct inode *inode)
1049 {
1050         return container_of(inode, struct cifsInodeInfo, vfs_inode);
1051 }
1052
1053 static inline struct cifs_sb_info *
1054 CIFS_SB(struct super_block *sb)
1055 {
1056         return sb->s_fs_info;
1057 }
1058
1059 static inline char CIFS_DIR_SEP(const struct cifs_sb_info *cifs_sb)
1060 {
1061         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
1062                 return '/';
1063         else
1064                 return '\\';
1065 }
1066
1067 static inline void
1068 convert_delimiter(char *path, char delim)
1069 {
1070         char old_delim, *pos;
1071
1072         if (delim == '/')
1073                 old_delim = '\\';
1074         else
1075                 old_delim = '/';
1076
1077         pos = path;
1078         while ((pos = strchr(pos, old_delim)))
1079                 *pos = delim;
1080 }
1081
1082 #ifdef CONFIG_CIFS_STATS
1083 #define cifs_stats_inc atomic_inc
1084
1085 static inline void cifs_stats_bytes_written(struct cifs_tcon *tcon,
1086                                             unsigned int bytes)
1087 {
1088         if (bytes) {
1089                 spin_lock(&tcon->stat_lock);
1090                 tcon->bytes_written += bytes;
1091                 spin_unlock(&tcon->stat_lock);
1092         }
1093 }
1094
1095 static inline void cifs_stats_bytes_read(struct cifs_tcon *tcon,
1096                                          unsigned int bytes)
1097 {
1098         spin_lock(&tcon->stat_lock);
1099         tcon->bytes_read += bytes;
1100         spin_unlock(&tcon->stat_lock);
1101 }
1102 #else
1103
1104 #define  cifs_stats_inc(field) do {} while (0)
1105 #define  cifs_stats_bytes_written(tcon, bytes) do {} while (0)
1106 #define  cifs_stats_bytes_read(tcon, bytes) do {} while (0)
1107
1108 #endif
1109
1110
1111 /*
1112  * This is the prototype for the mid receive function. This function is for
1113  * receiving the rest of the SMB frame, starting with the WordCount (which is
1114  * just after the MID in struct smb_hdr). Note:
1115  *
1116  * - This will be called by cifsd, with no locks held.
1117  * - The mid will still be on the pending_mid_q.
1118  * - mid->resp_buf will point to the current buffer.
1119  *
1120  * Returns zero on a successful receive, or an error. The receive state in
1121  * the TCP_Server_Info will also be updated.
1122  */
1123 typedef int (mid_receive_t)(struct TCP_Server_Info *server,
1124                             struct mid_q_entry *mid);
1125
1126 /*
1127  * This is the prototype for the mid callback function. This is called once the
1128  * mid has been received off of the socket. When creating one, take special
1129  * care to avoid deadlocks. Things to bear in mind:
1130  *
1131  * - it will be called by cifsd, with no locks held
1132  * - the mid will be removed from any lists
1133  */
1134 typedef void (mid_callback_t)(struct mid_q_entry *mid);
1135
1136 /* one of these for every pending CIFS request to the server */
1137 struct mid_q_entry {
1138         struct list_head qhead; /* mids waiting on reply from this server */
1139         struct TCP_Server_Info *server; /* server corresponding to this mid */
1140         __u64 mid;              /* multiplex id */
1141         __u32 pid;              /* process id */
1142         __u32 sequence_number;  /* for CIFS signing */
1143         unsigned long when_alloc;  /* when mid was created */
1144 #ifdef CONFIG_CIFS_STATS2
1145         unsigned long when_sent; /* time when smb send finished */
1146         unsigned long when_received; /* when demux complete (taken off wire) */
1147 #endif
1148         mid_receive_t *receive; /* call receive callback */
1149         mid_callback_t *callback; /* call completion callback */
1150         void *callback_data;      /* general purpose pointer for callback */
1151         void *resp_buf;         /* pointer to received SMB header */
1152         int mid_state;  /* wish this were enum but can not pass to wait_event */
1153         __le16 command;         /* smb command code */
1154         bool large_buf:1;       /* if valid response, is pointer to large buf */
1155         bool multiRsp:1;        /* multiple trans2 responses for one request  */
1156         bool multiEnd:1;        /* both received */
1157 };
1158
1159 /*      Make code in transport.c a little cleaner by moving
1160         update of optional stats into function below */
1161 #ifdef CONFIG_CIFS_STATS2
1162
1163 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1164 {
1165         atomic_inc(&server->in_send);
1166 }
1167
1168 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1169 {
1170         atomic_dec(&server->in_send);
1171 }
1172
1173 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1174 {
1175         atomic_inc(&server->num_waiters);
1176 }
1177
1178 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1179 {
1180         atomic_dec(&server->num_waiters);
1181 }
1182
1183 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1184 {
1185         mid->when_sent = jiffies;
1186 }
1187 #else
1188 static inline void cifs_in_send_inc(struct TCP_Server_Info *server)
1189 {
1190 }
1191 static inline void cifs_in_send_dec(struct TCP_Server_Info *server)
1192 {
1193 }
1194
1195 static inline void cifs_num_waiters_inc(struct TCP_Server_Info *server)
1196 {
1197 }
1198
1199 static inline void cifs_num_waiters_dec(struct TCP_Server_Info *server)
1200 {
1201 }
1202
1203 static inline void cifs_save_when_sent(struct mid_q_entry *mid)
1204 {
1205 }
1206 #endif
1207
1208 /* for pending dnotify requests */
1209 struct dir_notify_req {
1210         struct list_head lhead;
1211         __le16 Pid;
1212         __le16 PidHigh;
1213         __u16 Mid;
1214         __u16 Tid;
1215         __u16 Uid;
1216         __u16 netfid;
1217         __u32 filter; /* CompletionFilter (for multishot) */
1218         int multishot;
1219         struct file *pfile;
1220 };
1221
1222 struct dfs_info3_param {
1223         int flags; /* DFSREF_REFERRAL_SERVER, DFSREF_STORAGE_SERVER*/
1224         int path_consumed;
1225         int server_type;
1226         int ref_flag;
1227         char *path_name;
1228         char *node_name;
1229 };
1230
1231 /*
1232  * common struct for holding inode info when searching for or updating an
1233  * inode with new info
1234  */
1235
1236 #define CIFS_FATTR_DFS_REFERRAL         0x1
1237 #define CIFS_FATTR_DELETE_PENDING       0x2
1238 #define CIFS_FATTR_NEED_REVAL           0x4
1239 #define CIFS_FATTR_INO_COLLISION        0x8
1240
1241 struct cifs_fattr {
1242         u32             cf_flags;
1243         u32             cf_cifsattrs;
1244         u64             cf_uniqueid;
1245         u64             cf_eof;
1246         u64             cf_bytes;
1247         u64             cf_createtime;
1248         kuid_t          cf_uid;
1249         kgid_t          cf_gid;
1250         umode_t         cf_mode;
1251         dev_t           cf_rdev;
1252         unsigned int    cf_nlink;
1253         unsigned int    cf_dtype;
1254         struct timespec cf_atime;
1255         struct timespec cf_mtime;
1256         struct timespec cf_ctime;
1257 };
1258
1259 static inline void free_dfs_info_param(struct dfs_info3_param *param)
1260 {
1261         if (param) {
1262                 kfree(param->path_name);
1263                 kfree(param->node_name);
1264                 kfree(param);
1265         }
1266 }
1267
1268 static inline void free_dfs_info_array(struct dfs_info3_param *param,
1269                                        int number_of_items)
1270 {
1271         int i;
1272         if ((number_of_items == 0) || (param == NULL))
1273                 return;
1274         for (i = 0; i < number_of_items; i++) {
1275                 kfree(param[i].path_name);
1276                 kfree(param[i].node_name);
1277         }
1278         kfree(param);
1279 }
1280
1281 #define   MID_FREE 0
1282 #define   MID_REQUEST_ALLOCATED 1
1283 #define   MID_REQUEST_SUBMITTED 2
1284 #define   MID_RESPONSE_RECEIVED 4
1285 #define   MID_RETRY_NEEDED      8 /* session closed while this request out */
1286 #define   MID_RESPONSE_MALFORMED 0x10
1287 #define   MID_SHUTDOWN           0x20
1288
1289 /* Types of response buffer returned from SendReceive2 */
1290 #define   CIFS_NO_BUFFER        0    /* Response buffer not returned */
1291 #define   CIFS_SMALL_BUFFER     1
1292 #define   CIFS_LARGE_BUFFER     2
1293 #define   CIFS_IOVEC            4    /* array of response buffers */
1294
1295 /* Type of Request to SendReceive2 */
1296 #define   CIFS_BLOCKING_OP      1    /* operation can block */
1297 #define   CIFS_ASYNC_OP         2    /* do not wait for response */
1298 #define   CIFS_TIMEOUT_MASK 0x003    /* only one of above set in req */
1299 #define   CIFS_LOG_ERROR    0x010    /* log NT STATUS if non-zero */
1300 #define   CIFS_LARGE_BUF_OP 0x020    /* large request buffer */
1301 #define   CIFS_NO_RESP      0x040    /* no response buffer required */
1302
1303 /* Type of request operation */
1304 #define   CIFS_ECHO_OP      0x080    /* echo request */
1305 #define   CIFS_OBREAK_OP   0x0100    /* oplock break request */
1306 #define   CIFS_NEG_OP      0x0200    /* negotiate request */
1307 #define   CIFS_OP_MASK     0x0380    /* mask request type */
1308
1309 /* Security Flags: indicate type of session setup needed */
1310 #define   CIFSSEC_MAY_SIGN      0x00001
1311 #define   CIFSSEC_MAY_NTLM      0x00002
1312 #define   CIFSSEC_MAY_NTLMV2    0x00004
1313 #define   CIFSSEC_MAY_KRB5      0x00008
1314 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1315 #define   CIFSSEC_MAY_LANMAN    0x00010
1316 #define   CIFSSEC_MAY_PLNTXT    0x00020
1317 #else
1318 #define   CIFSSEC_MAY_LANMAN    0
1319 #define   CIFSSEC_MAY_PLNTXT    0
1320 #endif /* weak passwords */
1321 #define   CIFSSEC_MAY_SEAL      0x00040 /* not supported yet */
1322 #define   CIFSSEC_MAY_NTLMSSP   0x00080 /* raw ntlmssp with ntlmv2 */
1323
1324 #define   CIFSSEC_MUST_SIGN     0x01001
1325 /* note that only one of the following can be set so the
1326 result of setting MUST flags more than once will be to
1327 require use of the stronger protocol */
1328 #define   CIFSSEC_MUST_NTLM     0x02002
1329 #define   CIFSSEC_MUST_NTLMV2   0x04004
1330 #define   CIFSSEC_MUST_KRB5     0x08008
1331 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1332 #define   CIFSSEC_MUST_LANMAN   0x10010
1333 #define   CIFSSEC_MUST_PLNTXT   0x20020
1334 #ifdef CONFIG_CIFS_UPCALL
1335 #define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
1336 #else
1337 #define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
1338 #endif /* UPCALL */
1339 #else /* do not allow weak pw hash */
1340 #define   CIFSSEC_MUST_LANMAN   0
1341 #define   CIFSSEC_MUST_PLNTXT   0
1342 #ifdef CONFIG_CIFS_UPCALL
1343 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
1344 #else
1345 #define   CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
1346 #endif /* UPCALL */
1347 #endif /* WEAK_PW_HASH */
1348 #define   CIFSSEC_MUST_SEAL     0x40040 /* not supported yet */
1349 #define   CIFSSEC_MUST_NTLMSSP  0x80080 /* raw ntlmssp with ntlmv2 */
1350
1351 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMSSP)
1352 #define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
1353 #define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
1354 /*
1355  *****************************************************************
1356  * All constants go here
1357  *****************************************************************
1358  */
1359
1360 #define UID_HASH (16)
1361
1362 /*
1363  * Note that ONE module should define _DECLARE_GLOBALS_HERE to cause the
1364  * following to be declared.
1365  */
1366
1367 /****************************************************************************
1368  *  Locking notes.  All updates to global variables and lists should be
1369  *                  protected by spinlocks or semaphores.
1370  *
1371  *  Spinlocks
1372  *  ---------
1373  *  GlobalMid_Lock protects:
1374  *      list operations on pending_mid_q and oplockQ
1375  *      updates to XID counters, multiplex id  and SMB sequence numbers
1376  *  cifs_file_list_lock protects:
1377  *      list operations on tcp and SMB session lists and tCon lists
1378  *  f_owner.lock protects certain per file struct operations
1379  *  mapping->page_lock protects certain per page operations
1380  *
1381  *  Semaphores
1382  *  ----------
1383  *  sesSem     operations on smb session
1384  *  tconSem    operations on tree connection
1385  *  fh_sem      file handle reconnection operations
1386  *
1387  ****************************************************************************/
1388
1389 #ifdef DECLARE_GLOBALS_HERE
1390 #define GLOBAL_EXTERN
1391 #else
1392 #define GLOBAL_EXTERN extern
1393 #endif
1394
1395 /*
1396  * the list of TCP_Server_Info structures, ie each of the sockets
1397  * connecting our client to a distinct server (ip address), is
1398  * chained together by cifs_tcp_ses_list. The list of all our SMB
1399  * sessions (and from that the tree connections) can be found
1400  * by iterating over cifs_tcp_ses_list
1401  */
1402 GLOBAL_EXTERN struct list_head          cifs_tcp_ses_list;
1403
1404 /*
1405  * This lock protects the cifs_tcp_ses_list, the list of smb sessions per
1406  * tcp session, and the list of tcon's per smb session. It also protects
1407  * the reference counters for the server, smb session, and tcon. Finally,
1408  * changes to the tcon->tidStatus should be done while holding this lock.
1409  */
1410 GLOBAL_EXTERN spinlock_t                cifs_tcp_ses_lock;
1411
1412 /*
1413  * This lock protects the cifs_file->llist and cifs_file->flist
1414  * list operations, and updates to some flags (cifs_file->invalidHandle)
1415  * It will be moved to either use the tcon->stat_lock or equivalent later.
1416  * If cifs_tcp_ses_lock and the lock below are both needed to be held, then
1417  * the cifs_tcp_ses_lock must be grabbed first and released last.
1418  */
1419 GLOBAL_EXTERN spinlock_t        cifs_file_list_lock;
1420
1421 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1422 /* Outstanding dir notify requests */
1423 GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
1424 /* DirNotify response queue */
1425 GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
1426 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1427
1428 /*
1429  * Global transaction id (XID) information
1430  */
1431 GLOBAL_EXTERN unsigned int GlobalCurrentXid;    /* protected by GlobalMid_Sem */
1432 GLOBAL_EXTERN unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */
1433 GLOBAL_EXTERN unsigned int GlobalMaxActiveXid;  /* prot by GlobalMid_Sem */
1434 GLOBAL_EXTERN spinlock_t GlobalMid_Lock;  /* protects above & list operations */
1435                                           /* on midQ entries */
1436 /*
1437  *  Global counters, updated atomically
1438  */
1439 GLOBAL_EXTERN atomic_t sesInfoAllocCount;
1440 GLOBAL_EXTERN atomic_t tconInfoAllocCount;
1441 GLOBAL_EXTERN atomic_t tcpSesAllocCount;
1442 GLOBAL_EXTERN atomic_t tcpSesReconnectCount;
1443 GLOBAL_EXTERN atomic_t tconInfoReconnectCount;
1444
1445 /* Various Debug counters */
1446 GLOBAL_EXTERN atomic_t bufAllocCount;    /* current number allocated  */
1447 #ifdef CONFIG_CIFS_STATS2
1448 GLOBAL_EXTERN atomic_t totBufAllocCount; /* total allocated over all time */
1449 GLOBAL_EXTERN atomic_t totSmBufAllocCount;
1450 #endif
1451 GLOBAL_EXTERN atomic_t smBufAllocCount;
1452 GLOBAL_EXTERN atomic_t midCount;
1453
1454 /* Misc globals */
1455 GLOBAL_EXTERN bool enable_oplocks; /* enable or disable oplocks */
1456 GLOBAL_EXTERN unsigned int lookupCacheEnabled;
1457 GLOBAL_EXTERN unsigned int global_secflags;     /* if on, session setup sent
1458                                 with more secure ntlmssp2 challenge/resp */
1459 GLOBAL_EXTERN unsigned int sign_CIFS_PDUs;  /* enable smb packet signing */
1460 GLOBAL_EXTERN unsigned int linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/
1461 GLOBAL_EXTERN unsigned int CIFSMaxBufSize;  /* max size not including hdr */
1462 GLOBAL_EXTERN unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
1463 GLOBAL_EXTERN unsigned int cifs_min_small;  /* min size of small buf pool */
1464 GLOBAL_EXTERN unsigned int cifs_max_pending; /* MAX requests at once to server*/
1465
1466 #ifdef CONFIG_CIFS_ACL
1467 GLOBAL_EXTERN struct rb_root uidtree;
1468 GLOBAL_EXTERN struct rb_root gidtree;
1469 GLOBAL_EXTERN spinlock_t siduidlock;
1470 GLOBAL_EXTERN spinlock_t sidgidlock;
1471 GLOBAL_EXTERN struct rb_root siduidtree;
1472 GLOBAL_EXTERN struct rb_root sidgidtree;
1473 GLOBAL_EXTERN spinlock_t uidsidlock;
1474 GLOBAL_EXTERN spinlock_t gidsidlock;
1475 #endif /* CONFIG_CIFS_ACL */
1476
1477 void cifs_oplock_break(struct work_struct *work);
1478
1479 extern const struct slow_work_ops cifs_oplock_break_ops;
1480 extern struct workqueue_struct *cifsiod_wq;
1481
1482 extern mempool_t *cifs_mid_poolp;
1483
1484 /* Operations for different SMB versions */
1485 #define SMB1_VERSION_STRING     "1.0"
1486 extern struct smb_version_operations smb1_operations;
1487 extern struct smb_version_values smb1_values;
1488 #define SMB20_VERSION_STRING    "2.0"
1489 /*extern struct smb_version_operations smb20_operations; */ /* not needed yet */
1490 extern struct smb_version_values smb20_values;
1491 #define SMB21_VERSION_STRING    "2.1"
1492 extern struct smb_version_operations smb21_operations;
1493 extern struct smb_version_values smb21_values;
1494 #define SMB30_VERSION_STRING    "3.0"
1495 extern struct smb_version_operations smb30_operations;
1496 extern struct smb_version_values smb30_values;
1497 #endif  /* _CIFS_GLOB_H */