1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24 
  25 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  26 /*        All Rights Reserved   */
  27 
  28 #ifndef _NFS_EXPORT_H
  29 #define _NFS_EXPORT_H
  30 
  31 #include <nfs/nfs_sec.h>
  32 #include <nfs/auth.h>
  33 #include <sys/vnode.h>
  34 #include <nfs/nfs4.h>
  35 #include <sys/kiconv.h>
  36 
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40 
  41 /*
  42  * nfs pseudo flavor number is owned by IANA. Need to make sure the
  43  * Solaris specific NFS_FLAVOR_NOMAP number will not overlap with any
  44  * new IANA defined pseudo flavor numbers. The chance for the overlap
  45  * is very small since the growth of new flavor numbers is expected
  46  * to be limited.
  47  */
  48 #define NFS_FLAVOR_NOMAP        999999  /* no nfs flavor mapping */
  49 
  50 /*
  51  * As duplicate flavors can be passed into exportfs in the arguments, we
  52  * allocate a cleaned up array with non duplicate flavors on the stack.
  53  * So we need to know how much to allocate.
  54  */
  55 #define MAX_FLAVORS             6       /* none, sys, dh, krb5, krb5i krb5p */
  56 
  57 /*
  58  * Note: exported_lock is currently used to ensure the integrity of
  59  * the secinfo fields.
  60  */
  61 struct secinfo {
  62         seconfig_t      s_secinfo;      /* /etc/nfssec.conf entry */
  63         unsigned int    s_flags;        /* flags (see below) */
  64         int32_t         s_refcnt;       /* reference count for tracking */
  65                                         /* how many children (self included) */
  66                                         /* use this flavor. */
  67         int             s_window;       /* window */
  68         uint_t          s_rootid;       /* UID to use for authorized roots */
  69         int             s_rootcnt;      /* count of root names */
  70         caddr_t         *s_rootnames;   /* array of root names */
  71                                         /* they are strings for AUTH_DES and */
  72                                         /* rpc_gss_principal_t for RPCSEC_GSS */
  73 };
  74 
  75 #ifdef _SYSCALL32
  76 struct secinfo32 {
  77         seconfig32_t    s_secinfo;      /* /etc/nfssec.conf entry */
  78         uint32_t        s_flags;        /* flags (see below) */
  79         int32_t         s_refcnt;       /* reference count for tracking */
  80                                         /* how many children (self included) */
  81                                         /* use this flavor. */
  82         int32_t         s_window;       /* window */
  83         uint32_t        s_rootid;       /* UID to use for authorized roots */
  84         int32_t         s_rootcnt;      /* count of root names */
  85         caddr32_t       s_rootnames;    /* array of root names */
  86                                         /* they are strings for AUTH_DES and */
  87                                         /* rpc_gss_principal_t for RPCSEC_GSS */
  88 };
  89 #endif /* _SYSCALL32 */
  90 
  91 /*
  92  * security negotiation related
  93  */
  94 
  95 #define SEC_QUERY       0x01    /* query sec modes */
  96 
  97 struct sec_ol {
  98         int             sec_flags;      /* security nego flags */
  99         uint_t          sec_index;      /* index into sec flavor array */
 100 };
 101 
 102 /*
 103  * Per-mode flags (secinfo.s_flags)
 104  */
 105 #define M_RO            0x01    /* exported ro to all */
 106 #define M_ROL           0x02    /* exported ro to all listed */
 107 #define M_RW            0x04    /* exported rw to all */
 108 #define M_RWL           0x08    /* exported ro to all listed */
 109 #define M_ROOT          0x10    /* root list is defined */
 110 #define M_4SEC_EXPORTED 0x20    /* this is an explicitly shared flavor */
 111 #define M_NONE          0x40    /* none list is defined */
 112 
 113 /* invalid secinfo reference count */
 114 #define SEC_REF_INVALID(p) ((p)->s_refcnt < 1)
 115 
 116 /* last secinfo reference */
 117 #define SEC_REF_LAST(p) ((p)->s_refcnt == 1)
 118 
 119 /* sec flavor explicitly shared for the exported node */
 120 #define SEC_REF_EXPORTED(p) ((p)->s_flags & M_4SEC_EXPORTED)
 121 
 122 /* the only reference count left is for referring itself */
 123 #define SEC_REF_SELF(p) (SEC_REF_LAST(p) && SEC_REF_EXPORTED(p))
 124 
 125 /*
 126  * The export information passed to exportfs() (Version 2)
 127  */
 128 #define EX_CURRENT_VERSION 2    /* current version of exportdata struct */
 129 
 130 struct exportdata {
 131         int             ex_version;     /* structure version */
 132         char            *ex_path;       /* exported path */
 133         size_t          ex_pathlen;     /* path length */
 134         int             ex_flags;       /* flags */
 135         unsigned int    ex_anon;        /* uid for unauthenticated requests */
 136         int             ex_seccnt;      /* count of security modes */
 137         struct secinfo  *ex_secinfo;    /* security mode info */
 138         char            *ex_index;      /* index file for public filesystem */
 139         char            *ex_log_buffer; /* path to logging buffer file */
 140         size_t          ex_log_bufferlen;       /* buffer file path len */
 141         char            *ex_tag;        /* tag used to identify log config */
 142         size_t          ex_taglen;      /* tag length */
 143 };
 144 
 145 #ifdef _SYSCALL32
 146 struct exportdata32 {
 147         int32_t         ex_version;     /* structure version */
 148         caddr32_t       ex_path;        /* exported path */
 149         int32_t         ex_pathlen;     /* path length */
 150         int32_t         ex_flags;       /* flags */
 151         uint32_t        ex_anon;        /* uid for unauthenticated requests */
 152         int32_t         ex_seccnt;      /* count of security modes */
 153         caddr32_t       ex_secinfo;     /* security mode info */
 154         caddr32_t       ex_index;       /* index file for public filesystem */
 155         caddr32_t       ex_log_buffer;  /* path to logging buffer file */
 156         int32_t         ex_log_bufferlen;       /* buffer file path len */
 157         caddr32_t       ex_tag;         /* tag used to identify log config */
 158         int32_t         ex_taglen;      /* tag length */
 159 };
 160 #endif /* _SYSCALL32 */
 161 
 162 /*
 163  * exported vfs flags.
 164  */
 165 
 166 #define EX_NOSUID       0x01    /* exported with unsetable set[ug]ids */
 167 #define EX_ACLOK        0x02    /* exported with maximal access if acl exists */
 168 #define EX_PUBLIC       0x04    /* exported with public filehandle */
 169 #define EX_NOSUB        0x08    /* no nfs_getfh or MCL below export point */
 170 #define EX_INDEX        0x10    /* exported with index file specified */
 171 #define EX_LOG          0x20    /* logging enabled */
 172 #define EX_LOG_ALLOPS   0x40    /* logging of all RPC operations enabled */
 173                                 /* by default only operations which affect */
 174                                 /* transaction logging are enabled */
 175 #define EX_PSEUDO       0x80    /* pseudo filesystem export */
 176 #ifdef VOLATILE_FH_TEST
 177 #define EX_VOLFH        0x100   /* XXX nfsv4 fh may expire anytime */
 178 #define EX_VOLRNM       0x200   /* XXX nfsv4 fh expire at rename */
 179 #define EX_VOLMIG       0x400   /* XXX nfsv4 fh expire at migration */
 180 #define EX_NOEXPOPEN    0x800   /* XXX nfsv4 fh no expire with open */
 181 #endif /* VOLATILE_FH_TEST */
 182 
 183 #define EX_CHARMAP      0x1000  /* NFS may need a character set conversion */
 184 #define EX_NOACLFAB     0x2000  /* If set, NFSv2 and v3 servers doesn't */
 185                                 /* fabricate ACL for VOP_GETSECATTR OTW call */
 186 
 187 #ifdef  _KERNEL
 188 
 189 #define RPC_IDEMPOTENT  0x1     /* idempotent or not */
 190 /*
 191  * Be very careful about which NFS procedures get the RPC_ALLOWANON bit.
 192  * Right now, it this bit is on, we ignore the results of per NFS request
 193  * access control.
 194  */
 195 #define RPC_ALLOWANON   0x2     /* allow anonymous access */
 196 #define RPC_MAPRESP     0x4     /* use mapped response buffer */
 197 #define RPC_AVOIDWORK   0x8     /* do work avoidance for dups */
 198 #define RPC_PUBLICFH_OK 0x10    /* allow use of public filehandle */
 199 
 200 /*
 201  * RPC_ALL is an or of all above bits to be used with "don't care"
 202  * nfsv4 ops. The flags of an nfsv4 request is the bit-AND of the
 203  * per-op flags.
 204  */
 205 #define RPC_ALL (RPC_IDEMPOTENT|RPC_ALLOWANON|RPC_AVOIDWORK|RPC_PUBLICFH_OK)
 206 
 207 
 208 #ifdef VOLATILE_FH_TEST
 209 struct ex_vol_rename {
 210         nfs_fh4_fmt_t vrn_fh_fmt;
 211         struct ex_vol_rename *vrn_next;
 212 };
 213 #endif /* VOLATILE_FH_TEST */
 214 
 215 /*
 216  * An auth cache entry can exist in 4 active states, with the inactive
 217  * state being indicated by no entry in the cache.
 218  *
 219  * A FRESH entry is one which is either new or has been refreshed at
 220  * least once.
 221  *
 222  * A STALE entry is one which has been detected to be too old. The
 223  * transistion from FRESH to STALE prevents multiple threads from
 224  * submitting refresh requests.
 225  *
 226  * A REFRESHING entry is one which is actively engaging the user land
 227  * mountd code to re-authenticate the cache entry.
 228  *
 229  * An INVALID entry was one which was either STALE or REFRESHING
 230  * and was deleted out of the encapsulating exi. Since we can't
 231  * delete it yet, we mark it as INVALID, which lets the refreshq
 232  * know not to work on it.
 233  *
 234  * Note that the auth state of the entry is always valid, even if the
 235  * entry is STALE. Just as you can eat stale bread, you can consume
 236  * a stale cache entry. The only time the contents change could be
 237  * during the transistion from REFRESHING to FRESH.
 238  */
 239 typedef enum auth_state {
 240         NFS_AUTH_FRESH,
 241         NFS_AUTH_STALE,
 242         NFS_AUTH_REFRESHING,
 243         NFS_AUTH_INVALID
 244 } auth_state_t;
 245 
 246 /*
 247  * An authorization cache entry
 248  *
 249  * Either the state in auth_state will protect the
 250  * contents or auth_lock must be held.
 251  */
 252 struct auth_cache {
 253         struct netbuf           auth_addr;
 254         int                     auth_flavor;
 255         int                     auth_access;
 256         time_t                  auth_time;
 257         time_t                  auth_freshness;
 258         auth_state_t            auth_state;
 259         char                    *auth_netid;
 260         kmutex_t                auth_lock;
 261         struct auth_cache       *auth_next;
 262 };
 263 
 264 #define AUTH_TABLESIZE  32
 265 
 266 /*
 267  * Structure containing log file meta-data.
 268  */
 269 struct log_file {
 270         unsigned int    lf_flags;       /* flags (see below) */
 271         int             lf_writers;     /* outstanding writers */
 272         int             lf_refcnt;      /* references to this struct */
 273         caddr_t         lf_path;        /* buffer file location */
 274         vnode_t         *lf_vp;         /* vnode for the buffer file */
 275         kmutex_t        lf_lock;
 276         kcondvar_t      lf_cv_waiters;
 277 };
 278 
 279 /*
 280  * log_file and log_buffer flags.
 281  */
 282 #define L_WAITING       0x01            /* flush of in-core data to stable */
 283                                         /* storage in progress */
 284 #define L_PRINTED       0x02            /* error message printed to console */
 285 #define L_ERROR         0x04            /* error condition detected */
 286 
 287 /*
 288  * The logging buffer information.
 289  * This structure may be shared by multiple exportinfo structures,
 290  * if they share the same buffer file.
 291  * This structure contains the basic information about the buffer, such
 292  * as it's location in the filesystem.
 293  *
 294  * 'lb_lock' protects all the fields in this structure except for 'lb_path',
 295  * and 'lb_next'.
 296  * 'lb_path' is a write-once/read-many field which needs no locking, it is
 297  * set before the structure is linked to any exportinfo structure.
 298  * 'lb_next' is protected by the log_buffer_list_lock.
 299  */
 300 struct log_buffer {
 301         unsigned int    lb_flags;       /* L_ONLIST set? */
 302         int             lb_refcnt;      /* references to this struct */
 303         unsigned int    lb_rec_id;      /* used to generate unique id */
 304         caddr_t         lb_path;        /* buffer file pathname */
 305         struct log_file *lb_logfile;    /* points to log_file structure */
 306         kmutex_t        lb_lock;
 307         struct log_buffer       *lb_next;
 308         kcondvar_t      lb_cv_waiters;
 309         caddr_t         lb_records;     /* linked list of records to write */
 310         int             lb_num_recs;    /* # of records to write */
 311         ssize_t         lb_size_queued; /* number of bytes queued for write */
 312 };
 313 
 314 #define LOG_BUFFER_HOLD(lbp)    { \
 315         mutex_enter(&(lbp)->lb_lock); \
 316         (lbp)->lb_refcnt++; \
 317         mutex_exit(&(lbp)->lb_lock); \
 318 }
 319 
 320 #define LOG_BUFFER_RELE(lbp)    { \
 321         log_buffer_rele(lbp); \
 322 }
 323 
 324 /*
 325  * Structure for character set conversion mapping based on client address.
 326  */
 327 struct charset_cache {
 328         struct charset_cache *next;
 329         kiconv_t        inbound;
 330         kiconv_t        outbound;
 331         struct sockaddr client_addr;
 332 };
 333 
 334 /* Forward declarations */
 335 struct exportinfo;
 336 struct exp_visible;
 337 struct svc_req;
 338 
 339 /*
 340  * Treenodes are used to build tree representing every node which is part
 341  * of nfs server pseudo namespace. They are connected with both exportinfo
 342  * and exp_visible struct. They were introduced to avoid lookup of ".."
 343  * in the underlying file system during unshare, which was failing if the
 344  * file system was forcibly unmounted or if the directory was removed.
 345  * One exp_visible_t can be shared via several treenode_t, i.e.
 346  * different tree_vis can point to the same exp_visible_t.
 347  * This will happen if some directory is on two different shared paths:
 348  * E.g. after share /tmp/a/b1 and share /tmp/a/b2 there will be two treenodes
 349  * corresponding to /tmp/a and both will have same value in tree_vis.
 350  *
 351  *
 352  *
 353  *     NEW DATA STRUCT         ORIGINAL DATA STRUCT
 354  *
 355  * ns_root +---+               +----------+
 356  *         | / |               |PSEUDO EXP|-->+---+   +---+   +---+
 357  *         +---+---------  ----+----------+   | a |-->| k |-->| b |
 358  *          /\                                +---+   +---+   +---+
 359  *         /  \                                .       .       .
 360  *     +---+...\.........  .....................       .       .
 361  *    *| a |    \              +----------+            .       .
 362  *     +---+-----\-------  ----|REAL EXP a|            .       .
 363  *       /        \            +----------+            .       .
 364  *      /        +===+...  .............................       .
 365  *     /        *| k |         +----------+                    .
 366  *    /          +===+---  ----|REAL EXP k|                    .
 367  *   /                         +----------+                    .
 368  *  +===+................  .....................................
 369  * *| b |                      +----------+
 370  *  +===+----------------  ----|REAL EXP b|-->+---+
 371  *     \                       +----------+   | d |
 372  *     +===+.............  ...................+---+
 373  *     | d |                   +----------+
 374  *     +===+-------------  ----|PSEUDO EXP|-->+---+   +---+
 375  *     /                       +----------+   | e |-->| g |
 376  * +---+.................  ...................+---+   +---+
 377  * | e |                                              .
 378  * +---+                                              .
 379  *    \                                               .
 380  *    +---+..............  ............................
 381  *   *| g |                    +----------+
 382  *    +---+--------------  ----|REAL EXP g|
 383  *                             +----------+
 384  *
 385  *
 386  *
 387  * +===+               +---+                    +---+
 388  * | b |..mountpoint   | e |..directory/file   *| a |..node is shared
 389  * +===+  (VROOT)      +---+                    +---+
 390  *
 391  *
 392  * Bi-directional interconnect:
 393  * treenode_t::tree_exi ---------  exportinfo_t::exi_tree
 394  * One-way direction connection:
 395  * treenode_t::tree_vis .........> exp_visible_t
 396  */
 397 /* Access to treenode_t is under protection of exported_lock RW_LOCK */
 398 typedef struct treenode {
 399         /* support for generic n-ary trees */
 400         struct treenode *tree_parent;
 401         struct treenode *tree_child_first;
 402         struct treenode *tree_sibling; /* next sibling */
 403         /* private, nfs specific part */
 404         struct exportinfo  *tree_exi;
 405         struct exp_visible *tree_vis;
 406 } treenode_t;
 407 
 408 /*
 409  * TREE_ROOT checks if the node corresponds to a filesystem root
 410  * TREE_EXPORTED checks if the node is explicitly shared
 411  */
 412 
 413 #define TREE_ROOT(t) \
 414         ((t)->tree_exi && (t)->tree_exi->exi_vp->v_flag & VROOT)
 415 
 416 #define TREE_EXPORTED(t) \
 417         ((t)->tree_exi && !PSEUDO((t)->tree_exi))
 418 
 419 /* Root of nfs pseudo namespace */
 420 extern treenode_t *ns_root;
 421 
 422 #define EXPTABLESIZE   256
 423 
 424 struct exp_hash {
 425         struct exportinfo       *prev;  /* ptr to the previous exportinfo */
 426         struct exportinfo       *next;  /* ptr to the next exportinfo */
 427         struct exportinfo       **bckt; /* backpointer to the hash bucket */
 428 };
 429 
 430 /*
 431  * A node associated with an export entry on the
 432  * list of exported filesystems.
 433  *
 434  * exi_count+exi_lock protects an individual exportinfo from being freed
 435  * when in use.
 436  *
 437  * You must have the writer lock on exported_lock to add/delete an exportinfo
 438  * structure to/from the list.
 439  *
 440  * exi_volatile_dev maps to VSW_VOLATILEDEV.  It means that the
 441  * underlying fs devno can change on each mount.  When set, the server
 442  * should not use va_fsid for a GETATTR(FATTR4_FSID) reply.  It must
 443  * use exi_fsid because it is guaranteed to be persistent.  This isn't
 444  * in any way related to NFS4 volatile filehandles.
 445  */
 446 struct exportinfo {
 447         struct exportdata       exi_export;
 448         fsid_t                  exi_fsid;
 449         struct fid              exi_fid;
 450         struct exp_hash         fid_hash;
 451         struct exp_hash         path_hash;
 452         struct treenode         *exi_tree;
 453         fhandle_t               exi_fh;
 454         krwlock_t               exi_cache_lock;
 455         kmutex_t                exi_lock;
 456         uint_t                  exi_count;
 457         vnode_t                 *exi_vp;
 458         vnode_t                 *exi_dvp;
 459         struct auth_cache       *exi_cache[AUTH_TABLESIZE];
 460         struct log_buffer       *exi_logbuffer;
 461         struct exp_visible      *exi_visible;
 462         struct charset_cache    *exi_charset;
 463         unsigned                exi_volatile_dev:1;
 464         unsigned                exi_moved:1;
 465 #ifdef VOLATILE_FH_TEST
 466         uint32_t                exi_volatile_id;
 467         struct ex_vol_rename    *exi_vol_rename;
 468         kmutex_t                exi_vol_rename_lock;
 469 #endif /* VOLATILE_FH_TEST */
 470 };
 471 
 472 typedef struct exportinfo exportinfo_t;
 473 typedef struct exportdata exportdata_t;
 474 typedef struct secinfo secinfo_t;
 475 
 476 /*
 477  * exp_visible is a visible list per filesystem. It is for filesystems
 478  * that may need a limited view of its contents. A pseudo export and
 479  * a real export at the mount point (VROOT) which has a subtree shared
 480  * has a visible list.
 481  *
 482  * The exi_visible field is NULL for normal, non=pseudo filesystems
 483  * which do not have any subtree exported. If the field is non-null,
 484  * it points to a list of visible entries, identified by vis_fid and/or
 485  * vis_ino. The presence of a "visible" list means that if this export
 486  * can only have a limited view, it can only view the entries in the
 487  * exp_visible list. The directories in the fid list comprise paths that
 488  * lead to exported directories.
 489  *
 490  * The vis_count field records the number of paths in this filesystem
 491  * that use this directory. The vis_exported field is non-zero if the
 492  * entry is an exported directory (leaf node).
 493  *
 494  * exp_visible itself is not reference counted. Each exp_visible is
 495  * referenced twice:
 496  * 1) from treenode::tree_vis
 497  * 2) linked from exportinfo::exi_visible
 498  * The 'owner' of exp_visible is the exportinfo structure. exp_visible should
 499  * be always freed only from exportinfo_t, never from treenode::tree_vis.
 500  */
 501 
 502 struct exp_visible {
 503         vnode_t                 *vis_vp;
 504         fid_t                   vis_fid;
 505         u_longlong_t            vis_ino;
 506         int                     vis_count;
 507         int                     vis_exported;
 508         struct exp_visible      *vis_next;
 509         struct secinfo          *vis_secinfo;
 510         int                     vis_seccnt;
 511 };
 512 typedef struct exp_visible exp_visible_t;
 513 
 514 #define PSEUDO(exi)     ((exi)->exi_export.ex_flags & EX_PSEUDO)
 515 #define EXP_LINKED(exi) ((exi)->fid_hash.bckt != NULL)
 516 
 517 #define EQFSID(fsidp1, fsidp2)  \
 518         (((fsidp1)->val[0] == (fsidp2)->val[0]) && \
 519             ((fsidp1)->val[1] == (fsidp2)->val[1]))
 520 
 521 #define EQFID(fidp1, fidp2)     \
 522         ((fidp1)->fid_len == (fidp2)->fid_len && \
 523             bcmp((char *)(fidp1)->fid_data, (char *)(fidp2)->fid_data, \
 524             (uint_t)(fidp1)->fid_len) == 0)
 525 
 526 #define exportmatch(exi, fsid, fid)     \
 527         (EQFSID(&(exi)->exi_fsid, (fsid)) && EQFID(&(exi)->exi_fid, (fid)))
 528 
 529 /*
 530  * Returns true iff exported filesystem is read-only to the given host.
 531  *
 532  * Note:  this macro should be as fast as possible since it's called
 533  * on each NFS modification request.
 534  */
 535 #define rdonly(exi, req)  (nfsauth_access(exi, req) & NFSAUTH_RO)
 536 #define rdonly4(exi, vp, req)  \
 537         (vn_is_readonly(vp) || \
 538             (nfsauth4_access(exi, vp, req) & (NFSAUTH_RO | NFSAUTH_LIMITED)))
 539 
 540 extern int      nfsauth4_access(struct exportinfo *, vnode_t *,
 541                                 struct svc_req *);
 542 extern int      nfsauth4_secinfo_access(struct exportinfo *,
 543                                 struct svc_req *, int, int);
 544 extern int      nfs_fhbcmp(char *, char *, int);
 545 extern int      nfs_exportinit(void);
 546 extern void     nfs_exportfini(void);
 547 extern int      chk_clnt_sec(struct exportinfo *, struct svc_req *req);
 548 extern int      makefh(fhandle_t *, struct vnode *, struct exportinfo *);
 549 extern int      makefh_ol(fhandle_t *, struct exportinfo *, uint_t);
 550 extern int      makefh3(nfs_fh3 *, struct vnode *, struct exportinfo *);
 551 extern int      makefh3_ol(nfs_fh3 *, struct exportinfo *, uint_t);
 552 extern vnode_t *nfs_fhtovp(fhandle_t *, struct exportinfo *);
 553 extern vnode_t *nfs3_fhtovp(nfs_fh3 *, struct exportinfo *);
 554 extern vnode_t *lm_fhtovp(fhandle_t *fh);
 555 extern vnode_t *lm_nfs3_fhtovp(nfs_fh3 *fh);
 556 extern struct   exportinfo *checkexport(fsid_t *, struct fid *);
 557 extern struct   exportinfo *checkexport4(fsid_t *, struct fid *, vnode_t *vp);
 558 extern void     exi_hold(struct exportinfo *);
 559 extern void     exi_rele(struct exportinfo *);
 560 extern struct exportinfo *nfs_vptoexi(vnode_t *, vnode_t *, cred_t *, int *,
 561     int *, bool_t);
 562 extern int      nfs_check_vpexi(vnode_t *, vnode_t *, cred_t *,
 563                         struct exportinfo **);
 564 extern void     export_link(struct exportinfo *);
 565 extern void     export_unlink(struct exportinfo *);
 566 extern vnode_t *untraverse(vnode_t *);
 567 extern int      vn_is_nfs_reparse(vnode_t *, cred_t *);
 568 extern int      client_is_downrev(struct svc_req *);
 569 extern char    *build_symlink(vnode_t *, cred_t *, size_t *);
 570 
 571 /*
 572  * Functions that handle the NFSv4 server namespace
 573  */
 574 extern exportinfo_t *vis2exi(treenode_t *);
 575 extern int      treeclimb_export(struct exportinfo *);
 576 extern void     treeclimb_unexport(struct exportinfo *);
 577 extern int      nfs_visible(struct exportinfo *, vnode_t *, int *);
 578 extern int      nfs_visible_inode(struct exportinfo *, ino64_t, int *);
 579 extern int      has_visible(struct exportinfo *, vnode_t *);
 580 extern void     free_visible(struct exp_visible *);
 581 extern int      nfs_exported(struct exportinfo *, vnode_t *);
 582 extern struct exportinfo *pseudo_exportfs(vnode_t *, fid_t *,
 583     struct exp_visible *, struct exportdata *);
 584 extern int      vop_fid_pseudo(vnode_t *, fid_t *fidp);
 585 extern int      nfs4_vget_pseudo(struct exportinfo *, vnode_t **, fid_t *);
 586 /*
 587  * Functions that handle the NFSv4 server namespace security flavors
 588  * information.
 589  */
 590 extern void     srv_secinfo_exp2pseu(struct exportdata *, struct exportdata *);
 591 extern void     srv_secinfo_list_free(struct secinfo *, int);
 592 
 593 /*
 594  * "public" and default (root) location for public filehandle
 595  */
 596 extern struct exportinfo *exi_public, *exi_root;
 597 extern fhandle_t nullfh2;       /* for comparing V2 filehandles */
 598 extern krwlock_t exported_lock;
 599 extern struct exportinfo *exptable[];
 600 
 601 /*
 602  * Two macros for identifying public filehandles.
 603  * A v2 public filehandle is 32 zero bytes.
 604  * A v3 public filehandle is zero length.
 605  */
 606 #define PUBLIC_FH2(fh) \
 607         ((fh)->fh_fsid.val[1] == 0 && \
 608         bcmp((fh), &nullfh2, sizeof (fhandle_t)) == 0)
 609 
 610 #define PUBLIC_FH3(fh) \
 611         ((fh)->fh3_length == 0)
 612 
 613 extern int      makefh4(nfs_fh4 *, struct vnode *, struct exportinfo *);
 614 extern vnode_t *nfs4_fhtovp(nfs_fh4 *, struct exportinfo *, nfsstat4 *);
 615 
 616 #endif /* _KERNEL */
 617 
 618 #ifdef  __cplusplus
 619 }
 620 #endif
 621 
 622 #endif  /* _NFS_EXPORT_H */