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 /*
23 * Copyright 2018 Nexenta Systems, Inc.
24 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Copyright 2016 Jason King.
26 */
27
28 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
29 /* All Rights Reserved */
30
31 #ifndef _NFS_EXPORT_H
32 #define _NFS_EXPORT_H
33
34 #include <nfs/nfs_sec.h>
35 #include <nfs/auth.h>
36 #include <sys/vnode.h>
37 #include <nfs/nfs4.h>
38 #include <sys/kiconv.h>
39 #include <sys/avl.h>
40
41 #ifdef _KERNEL
42 #include <sys/pkp_hash.h> /* for PKP_HASH_SIZE */
43 #endif /* _KERNEL */
44
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48
49 /*
50 * nfs pseudo flavor number is owned by IANA. Need to make sure the
51 * Solaris specific NFS_FLAVOR_NOMAP number will not overlap with any
52 * new IANA defined pseudo flavor numbers. The chance for the overlap
53 * is very small since the growth of new flavor numbers is expected
54 * to be limited.
55 */
56 #define NFS_FLAVOR_NOMAP 999999 /* no nfs flavor mapping */
57
58 /*
59 * As duplicate flavors can be passed into exportfs in the arguments, we
60 * allocate a cleaned up array with non duplicate flavors on the stack.
61 * So we need to know how much to allocate.
62 */
63 #define MAX_FLAVORS 6 /* none, sys, dh, krb5, krb5i krb5p */
64
65 /*
66 * Note: exported_lock is currently used to ensure the integrity of
67 * the secinfo fields.
68 */
69 struct secinfo {
70 seconfig_t s_secinfo; /* /etc/nfssec.conf entry */
71 unsigned int s_flags; /* flags (see below) */
72 int32_t s_refcnt; /* reference count for tracking */
73 /* how many children (self included) */
74 /* use this flavor. */
75 int s_window; /* window */
76 uint_t s_rootid; /* UID to use for authorized roots */
77 int s_rootcnt; /* count of root names */
78 caddr_t *s_rootnames; /* array of root names */
79 /* they are strings for AUTH_DES and */
80 /* rpc_gss_principal_t for RPCSEC_GSS */
81 };
82
83 #ifdef _SYSCALL32
84 struct secinfo32 {
85 seconfig32_t s_secinfo; /* /etc/nfssec.conf entry */
86 uint32_t s_flags; /* flags (see below) */
87 int32_t s_refcnt; /* reference count for tracking */
88 /* how many children (self included) */
89 /* use this flavor. */
90 int32_t s_window; /* window */
91 uint32_t s_rootid; /* UID to use for authorized roots */
92 int32_t s_rootcnt; /* count of root names */
93 caddr32_t s_rootnames; /* array of root names */
94 /* they are strings for AUTH_DES and */
95 /* rpc_gss_principal_t for RPCSEC_GSS */
96 };
97 #endif /* _SYSCALL32 */
98
99 /*
100 * security negotiation related
101 */
102
103 #define SEC_QUERY 0x01 /* query sec modes */
104
105 struct sec_ol {
106 int sec_flags; /* security nego flags */
107 uint_t sec_index; /* index into sec flavor array */
108 };
109
110 /*
111 * Per-mode flags (secinfo.s_flags)
112 */
113 #define M_RO 0x01 /* exported ro to all */
114 #define M_ROL 0x02 /* exported ro to all listed */
115 #define M_RW 0x04 /* exported rw to all */
116 #define M_RWL 0x08 /* exported ro to all listed */
117 #define M_ROOT 0x10 /* root list is defined */
118 #define M_4SEC_EXPORTED 0x20 /* this is an explicitly shared flavor */
119 #define M_NONE 0x40 /* none list is defined */
120 #define M_MAP 0x80 /* uidmap and/or gidmap is defined */
121
122 /* invalid secinfo reference count */
123 #define SEC_REF_INVALID(p) ((p)->s_refcnt < 1)
124
125 /* last secinfo reference */
126 #define SEC_REF_LAST(p) ((p)->s_refcnt == 1)
127
128 /* sec flavor explicitly shared for the exported node */
129 #define SEC_REF_EXPORTED(p) ((p)->s_flags & M_4SEC_EXPORTED)
130
131 /* the only reference count left is for referring itself */
132 #define SEC_REF_SELF(p) (SEC_REF_LAST(p) && SEC_REF_EXPORTED(p))
133
134 /*
135 * The export information passed to exportfs() (Version 2)
136 */
137 #define EX_CURRENT_VERSION 2 /* current version of exportdata struct */
138
139 struct exportdata {
140 int ex_version; /* structure version */
141 char *ex_path; /* exported path */
142 size_t ex_pathlen; /* path length */
143 int ex_flags; /* flags */
144 unsigned int ex_anon; /* uid for unauthenticated requests */
145 int ex_seccnt; /* count of security modes */
146 struct secinfo *ex_secinfo; /* security mode info */
147 char *ex_index; /* index file for public filesystem */
148 char *ex_log_buffer; /* path to logging buffer file */
149 size_t ex_log_bufferlen; /* buffer file path len */
150 char *ex_tag; /* tag used to identify log config */
151 size_t ex_taglen; /* tag length */
152 };
153
154 #ifdef _SYSCALL32
155 struct exportdata32 {
156 int32_t ex_version; /* structure version */
157 caddr32_t ex_path; /* exported path */
158 int32_t ex_pathlen; /* path length */
159 int32_t ex_flags; /* flags */
160 uint32_t ex_anon; /* uid for unauthenticated requests */
161 int32_t ex_seccnt; /* count of security modes */
162 caddr32_t ex_secinfo; /* security mode info */
163 caddr32_t ex_index; /* index file for public filesystem */
164 caddr32_t ex_log_buffer; /* path to logging buffer file */
165 int32_t ex_log_bufferlen; /* buffer file path len */
166 caddr32_t ex_tag; /* tag used to identify log config */
167 int32_t ex_taglen; /* tag length */
168 };
169 #endif /* _SYSCALL32 */
170
171 /*
172 * exported vfs flags.
173 */
174
175 #define EX_NOSUID 0x01 /* exported with unsetable set[ug]ids */
176 #define EX_ACLOK 0x02 /* exported with maximal access if acl exists */
177 #define EX_PUBLIC 0x04 /* exported with public filehandle */
178 #define EX_NOSUB 0x08 /* no nfs_getfh or MCL below export point */
179 #define EX_INDEX 0x10 /* exported with index file specified */
180 #define EX_LOG 0x20 /* logging enabled */
181 #define EX_LOG_ALLOPS 0x40 /* logging of all RPC operations enabled */
182 /* by default only operations which affect */
183 /* transaction logging are enabled */
184 #define EX_PSEUDO 0x80 /* pseudo filesystem export */
185 #ifdef VOLATILE_FH_TEST
186 #define EX_VOLFH 0x100 /* XXX nfsv4 fh may expire anytime */
187 #define EX_VOLRNM 0x200 /* XXX nfsv4 fh expire at rename */
188 #define EX_VOLMIG 0x400 /* XXX nfsv4 fh expire at migration */
189 #define EX_NOEXPOPEN 0x800 /* XXX nfsv4 fh no expire with open */
190 #endif /* VOLATILE_FH_TEST */
191
192 #define EX_CHARMAP 0x1000 /* NFS may need a character set conversion */
193 #define EX_NOACLFAB 0x2000 /* If set, NFSv2 and v3 servers won't */
194 /* fabricate an aclent_t ACL on file systems */
195 /* that don't support aclent_t ACLs */
196 #define EX_NOHIDE 0x4000 /* traversable from exported parent */
197
198 #ifdef _KERNEL
199
200 #define RPC_IDEMPOTENT 0x1 /* idempotent or not */
201 /*
202 * Be very careful about which NFS procedures get the RPC_ALLOWANON bit.
203 * Right now, if this bit is on, we ignore the results of per NFS request
204 * access control.
205 */
206 #define RPC_ALLOWANON 0x2 /* allow anonymous access */
207 #define RPC_MAPRESP 0x4 /* use mapped response buffer */
208 #define RPC_AVOIDWORK 0x8 /* do work avoidance for dups */
209 #define RPC_PUBLICFH_OK 0x10 /* allow use of public filehandle */
210
211 /*
212 * RPC_ALL is an or of all above bits to be used with "don't care"
213 * nfsv4 ops. The flags of an nfsv4 request is the bit-AND of the
214 * per-op flags.
215 */
216 #define RPC_ALL (RPC_IDEMPOTENT|RPC_ALLOWANON|RPC_AVOIDWORK|RPC_PUBLICFH_OK)
217
218
219 #ifdef VOLATILE_FH_TEST
220 struct ex_vol_rename {
221 nfs_fh4_fmt_t vrn_fh_fmt;
222 struct ex_vol_rename *vrn_next;
223 };
224 #endif /* VOLATILE_FH_TEST */
225
226 /*
227 * An auth cache client entry. This is the umbrella structure and contains all
228 * related auth_cache entries in the authc_tree AVL tree.
229 */
230 struct auth_cache_clnt {
231 avl_node_t authc_link;
232 struct netbuf authc_addr; /* address of the client */
233 krwlock_t authc_lock; /* protects authc_tree */
234 avl_tree_t authc_tree; /* auth_cache entries */
235 };
236
237 /*
238 * An auth cache entry can exist in 6 states.
239 *
240 * A NEW entry was recently allocated and added to the cache. It does not
241 * contain the valid auth state yet.
242 *
243 * A WAITING entry is one which is actively engaging the user land mountd code
244 * to authenticate or re-authenticate it. The auth state might not be valid
245 * yet. The other threads should wait on auth_cv until the retrieving thread
246 * finishes the retrieval and changes the auth cache entry to FRESH, or NEW (in
247 * a case this entry had no valid auth state yet).
248 *
249 * A REFRESHING entry is one which is actively engaging the user land mountd
250 * code to re-authenticate the cache entry. There is currently no other thread
251 * waiting for the results of the refresh.
252 *
253 * A FRESH entry is one which is valid (it is either newly retrieved or has
254 * been refreshed at least once).
255 *
256 * A STALE entry is one which has been detected to be too old. The transition
257 * from FRESH to STALE prevents multiple threads from submitting refresh
258 * requests.
259 *
260 * An INVALID entry is one which was either STALE or REFRESHING and was deleted
261 * out of the encapsulating exi. Since we can't delete it yet, we mark it as
262 * INVALID, which lets the refresh thread know not to work on it and free it
263 * instead.
264 *
265 * Note that the auth state of the entry is valid, even if the entry is STALE.
266 * Just as you can eat stale bread, you can consume a stale cache entry. The
267 * only time the contents change could be during the transition from REFRESHING
268 * or WAITING to FRESH.
269 *
270 * Valid state transitions:
271 *
272 * alloc
273 * |
274 * v
275 * +-----+
276 * +--->| NEW |------>free
277 * | +-----+
278 * | |
279 * | v
280 * | +---------+
281 * +<-| WAITING |
282 * ^ +---------+
283 * | |
284 * | v
285 * | +<--------------------------+<---------------+
286 * | | ^ |
287 * | v | |
288 * | +-------+ +-------+ +------------+ +---------+
289 * +---| FRESH |--->| STALE |--->| REFRESHING |--->| WAITING |
290 * +-------+ +-------+ +------------+ +---------+
291 * | | |
292 * | v |
293 * v +---------+ |
294 * free<-----| INVALID |<--------+
295 * +---------+
296 */
297 typedef enum auth_state {
298 NFS_AUTH_FRESH,
299 NFS_AUTH_STALE,
300 NFS_AUTH_REFRESHING,
301 NFS_AUTH_INVALID,
302 NFS_AUTH_NEW,
303 NFS_AUTH_WAITING
304 } auth_state_t;
305
306 /*
307 * An authorization cache entry
308 *
309 * Either the state in auth_state will protect the
310 * contents or auth_lock must be held.
311 */
312 struct auth_cache {
313 avl_node_t auth_link;
314 struct auth_cache_clnt *auth_clnt;
315 int auth_flavor;
316 cred_t *auth_clnt_cred;
317 uid_t auth_srv_uid;
318 gid_t auth_srv_gid;
319 uint_t auth_srv_ngids;
320 gid_t *auth_srv_gids;
321 int auth_access;
322 time_t auth_time;
323 time_t auth_freshness;
324 auth_state_t auth_state;
325 kmutex_t auth_lock;
326 kcondvar_t auth_cv;
327 };
328
329 #define AUTH_TABLESIZE 32
330
331 /*
332 * Structure containing log file meta-data.
333 */
334 struct log_file {
335 unsigned int lf_flags; /* flags (see below) */
336 int lf_writers; /* outstanding writers */
337 int lf_refcnt; /* references to this struct */
338 caddr_t lf_path; /* buffer file location */
339 vnode_t *lf_vp; /* vnode for the buffer file */
340 kmutex_t lf_lock;
341 kcondvar_t lf_cv_waiters;
342 };
343
344 /*
345 * log_file and log_buffer flags.
346 */
347 #define L_WAITING 0x01 /* flush of in-core data to stable */
348 /* storage in progress */
349 #define L_PRINTED 0x02 /* error message printed to console */
350 #define L_ERROR 0x04 /* error condition detected */
351
352 /*
353 * The logging buffer information.
354 * This structure may be shared by multiple exportinfo structures,
355 * if they share the same buffer file.
356 * This structure contains the basic information about the buffer, such
357 * as it's location in the filesystem.
358 *
359 * 'lb_lock' protects all the fields in this structure except for 'lb_path',
360 * and 'lb_next'.
361 * 'lb_path' is a write-once/read-many field which needs no locking, it is
362 * set before the structure is linked to any exportinfo structure.
363 * 'lb_next' is protected by the log_buffer_list_lock.
364 */
365 struct log_buffer {
366 unsigned int lb_flags; /* L_ONLIST set? */
367 int lb_refcnt; /* references to this struct */
368 unsigned int lb_rec_id; /* used to generate unique id */
369 caddr_t lb_path; /* buffer file pathname */
370 struct log_file *lb_logfile; /* points to log_file structure */
371 kmutex_t lb_lock;
372 struct log_buffer *lb_next;
373 kcondvar_t lb_cv_waiters;
374 caddr_t lb_records; /* linked list of records to write */
375 int lb_num_recs; /* # of records to write */
376 ssize_t lb_size_queued; /* number of bytes queued for write */
377 };
378
379 #define LOG_BUFFER_HOLD(lbp) { \
380 mutex_enter(&(lbp)->lb_lock); \
381 (lbp)->lb_refcnt++; \
382 mutex_exit(&(lbp)->lb_lock); \
383 }
384
385 #define LOG_BUFFER_RELE(lbp) { \
386 log_buffer_rele(lbp); \
387 }
388
389 /*
390 * Structure for character set conversion mapping based on client address.
391 */
392 struct charset_cache {
393 struct charset_cache *next;
394 kiconv_t inbound;
395 kiconv_t outbound;
396 struct sockaddr client_addr;
397 };
398
399 /* Forward declarations */
400 struct exportinfo;
401 struct exp_visible;
402 struct svc_req;
403
404 /*
405 * Treenodes are used to build tree representing every node which is part
406 * of nfs server pseudo namespace. They are connected with both exportinfo
407 * and exp_visible struct. They were introduced to avoid lookup of ".."
408 * in the underlying file system during unshare, which was failing if the
409 * file system was forcibly unmounted or if the directory was removed.
410 * One exp_visible_t can be shared via several treenode_t, i.e.
411 * different tree_vis can point to the same exp_visible_t.
412 * This will happen if some directory is on two different shared paths:
413 * E.g. after share /tmp/a/b1 and share /tmp/a/b2 there will be two treenodes
414 * corresponding to /tmp/a and both will have same value in tree_vis.
415 *
416 *
417 *
418 * NEW DATA STRUCT ORIGINAL DATA STRUCT
419 *
420 * ns_root +---+ +----------+
421 * | / | |PSEUDO EXP|-->+---+ +---+ +---+
422 * +---+--------- ----+----------+ | a |-->| k |-->| b |
423 * /\ +---+ +---+ +---+
424 * / \ . . .
425 * +---+...\......... ..................... . .
426 * *| a | \ +----------+ . .
427 * +---+-----\------- ----|REAL EXP a| . .
428 * / \ +----------+ . .
429 * / +===+... ............................. .
430 * / *| k | +----------+ .
431 * / +===+--- ----|REAL EXP k| .
432 * / +----------+ .
433 * +===+................ .....................................
434 * *| b | +----------+
435 * +===+---------------- ----|REAL EXP b|-->+---+
436 * \ +----------+ | d |
437 * +===+............. ...................+---+
438 * | d | +----------+
439 * +===+------------- ----|PSEUDO EXP|-->+---+ +---+
440 * / +----------+ | e |-->| g |
441 * +---+................. ...................+---+ +---+
442 * | e | .
443 * +---+ .
444 * \ .
445 * +---+.............. ............................
446 * *| g | +----------+
447 * +---+-------------- ----|REAL EXP g|
448 * +----------+
449 *
450 *
451 *
452 * +===+ +---+ +---+
453 * | b |..mountpoint | e |..directory/file *| a |..node is shared
454 * +===+ (VROOT) +---+ +---+
455 *
456 *
457 * Bi-directional interconnect:
458 * treenode_t::tree_exi --------- exportinfo_t::exi_tree
459 * One-way direction connection:
460 * treenode_t::tree_vis .........> exp_visible_t
461 */
462 /* Access to treenode_t is under protection of exported_lock RW_LOCK */
463 typedef struct treenode {
464 /* support for generic n-ary trees */
465 struct treenode *tree_parent;
466 struct treenode *tree_child_first;
467 struct treenode *tree_sibling; /* next sibling */
468 /* private, nfs specific part */
469 struct exportinfo *tree_exi;
470 struct exp_visible *tree_vis;
471 } treenode_t;
472
473 /*
474 * TREE_ROOT checks if the node corresponds to a filesystem root
475 * TREE_EXPORTED checks if the node is explicitly shared
476 */
477
478 #define TREE_ROOT(t) \
479 ((t)->tree_exi && (t)->tree_exi->exi_vp->v_flag & VROOT)
480
481 #define TREE_EXPORTED(t) \
482 ((t)->tree_exi && !PSEUDO((t)->tree_exi))
483
484 #define EXPTABLESIZE 256
485
486 struct exp_hash {
487 struct exportinfo *prev; /* ptr to the previous exportinfo */
488 struct exportinfo *next; /* ptr to the next exportinfo */
489 struct exportinfo **bckt; /* backpointer to the hash bucket */
490 };
491
492 /*
493 * A node associated with an export entry on the
494 * list of exported filesystems.
495 *
496 * exi_count+exi_lock protects an individual exportinfo from being freed
497 * when in use.
498 *
499 * You must have the writer lock on exported_lock to add/delete an exportinfo
500 * structure to/from the list.
501 *
502 * exi_volatile_dev maps to VSW_VOLATILEDEV. It means that the
503 * underlying fs devno can change on each mount. When set, the server
504 * should not use va_fsid for a GETATTR(FATTR4_FSID) reply. It must
505 * use exi_fsid because it is guaranteed to be persistent. This isn't
506 * in any way related to NFS4 volatile filehandles.
507 *
508 * The exi_cache_lock protects the exi_cache AVL trees.
509 */
510 struct exportinfo {
511 struct exportdata exi_export;
512 fsid_t exi_fsid;
513 struct fid exi_fid;
514 struct exp_hash fid_hash;
515 struct exp_hash path_hash;
516 struct treenode *exi_tree;
517 fhandle_t exi_fh;
518 krwlock_t exi_cache_lock;
519 kmutex_t exi_lock;
520 uint_t exi_count;
521 vnode_t *exi_vp;
522 vnode_t *exi_dvp;
523 avl_tree_t *exi_cache[AUTH_TABLESIZE];
524 struct log_buffer *exi_logbuffer;
525 struct exp_visible *exi_visible;
526 struct charset_cache *exi_charset;
527 unsigned exi_volatile_dev:1;
528 unsigned exi_moved:1;
529 #ifdef VOLATILE_FH_TEST
530 uint32_t exi_volatile_id;
531 struct ex_vol_rename *exi_vol_rename;
532 kmutex_t exi_vol_rename_lock;
533 #endif /* VOLATILE_FH_TEST */
534 int exi_id;
535 avl_node_t exi_id_link;
536 struct exp_kstats *exi_kstats;
537 zoneid_t exi_zoneid;
538 };
539
540 typedef struct exportinfo exportinfo_t;
541 typedef struct exportdata exportdata_t;
542 typedef struct secinfo secinfo_t;
543
544 /*
545 * exp_visible is a visible list per filesystem. It is for filesystems
546 * that may need a limited view of its contents. A pseudo export and
547 * a real export at the mount point (VROOT) which has a subtree shared
548 * has a visible list.
549 *
550 * The exi_visible field is NULL for normal, non-pseudo filesystems
551 * which do not have any subtree exported. If the field is non-null,
552 * it points to a list of visible entries, identified by vis_fid and/or
553 * vis_ino. The presence of a "visible" list means that if this export
554 * can only have a limited view, it can only view the entries in the
555 * exp_visible list. The directories in the fid list comprise paths that
556 * lead to exported directories.
557 *
558 * The vis_count field records the number of paths in this filesystem
559 * that use this directory. The vis_exported field is non-zero if the
560 * entry is an exported directory (leaf node).
561 *
562 * exp_visible itself is not reference counted. Each exp_visible is
563 * referenced twice:
564 * 1) from treenode::tree_vis
565 * 2) linked from exportinfo::exi_visible
566 * The 'owner' of exp_visible is the exportinfo structure. exp_visible should
567 * be always freed only from exportinfo_t, never from treenode::tree_vis.
568 */
569
570 struct exp_visible {
571 vnode_t *vis_vp;
572 fid_t vis_fid;
573 u_longlong_t vis_ino;
574 int vis_count;
575 int vis_exported;
576 struct exp_visible *vis_next;
577 struct secinfo *vis_secinfo;
578 int vis_seccnt;
579 timespec_t vis_change;
580 };
581 typedef struct exp_visible exp_visible_t;
582
583 #define PSEUDO(exi) ((exi)->exi_export.ex_flags & EX_PSEUDO)
584 #define EXP_LINKED(exi) ((exi)->fid_hash.bckt != NULL)
585
586 #define EQFSID(fsidp1, fsidp2) \
587 (((fsidp1)->val[0] == (fsidp2)->val[0]) && \
588 ((fsidp1)->val[1] == (fsidp2)->val[1]))
589
590 #define EQFID(fidp1, fidp2) \
591 ((fidp1)->fid_len == (fidp2)->fid_len && \
592 bcmp((char *)(fidp1)->fid_data, (char *)(fidp2)->fid_data, \
593 (uint_t)(fidp1)->fid_len) == 0)
594
595 #define exportmatch(exi, fsid, fid) \
596 (EQFSID(&(exi)->exi_fsid, (fsid)) && EQFID(&(exi)->exi_fid, (fid)))
597
598 /*
599 * Returns true iff exported filesystem is read-only to the given host.
600 *
601 * Note: this macro should be as fast as possible since it's called
602 * on each NFS modification request.
603 */
604 #define rdonly(ro, vp) ((ro) || vn_is_readonly(vp))
605 #define rdonly4(req, cs) \
606 (vn_is_readonly((cs)->vp) || \
607 (nfsauth4_access((cs)->exi, (cs)->vp, (req), (cs)->basecr, NULL, \
608 NULL, NULL, NULL) & (NFSAUTH_RO | NFSAUTH_LIMITED)))
609
610 extern int nfsauth4_access(struct exportinfo *, vnode_t *,
611 struct svc_req *, cred_t *, uid_t *, gid_t *, uint_t *, gid_t **);
612 extern int nfsauth4_secinfo_access(struct exportinfo *,
613 struct svc_req *, int, int, cred_t *);
614 extern int nfsauth_cache_clnt_compar(const void *, const void *);
615 extern int nfs_fhbcmp(char *, char *, int);
616 extern void nfs_exportinit(void);
617 extern void nfs_exportfini(void);
618 extern int chk_clnt_sec(struct exportinfo *, struct svc_req *);
619 extern int makefh(fhandle_t *, struct vnode *, struct exportinfo *);
620 extern int makefh_ol(fhandle_t *, struct exportinfo *, uint_t);
621 extern int makefh3(nfs_fh3 *, struct vnode *, struct exportinfo *);
622 extern int makefh3_ol(nfs_fh3 *, struct exportinfo *, uint_t);
623 extern vnode_t *nfs_fhtovp(fhandle_t *, struct exportinfo *);
624 extern vnode_t *nfs3_fhtovp(nfs_fh3 *, struct exportinfo *);
625 extern struct exportinfo *checkexport(fsid_t *, struct fid *);
626 extern struct exportinfo *checkexport4(fsid_t *, struct fid *, vnode_t *);
627 extern void exi_hold(struct exportinfo *);
628 extern void exi_rele(struct exportinfo **);
629 extern struct exportinfo *nfs_vptoexi(vnode_t *, vnode_t *, cred_t *, int *,
630 int *, bool_t);
631 extern int nfs_check_vpexi(vnode_t *, vnode_t *, cred_t *,
632 struct exportinfo **);
633 extern vnode_t *untraverse(vnode_t *);
634 extern int vn_is_nfs_reparse(vnode_t *, cred_t *);
635 extern int client_is_downrev(struct svc_req *);
636 extern char *build_symlink(vnode_t *, cred_t *, size_t *);
637
638 extern fhandle_t nullfh2; /* for comparing V2 filehandles */
639
640 typedef struct nfs_export {
641 /* Root of nfs pseudo namespace */
642 treenode_t *ns_root;
643
644 struct exportinfo *exptable_path_hash[PKP_HASH_SIZE];
645 struct exportinfo *exptable[EXPTABLESIZE];
646
647 /*
648 * Read/Write lock that protects the exportinfo list. This lock
649 * must be held when searching or modifiying the exportinfo list.
650 */
651 krwlock_t exported_lock;
652
653 /* "public" and default (root) location for public filehandle */
654 struct exportinfo *exi_public, *exi_root;
655 /* For checking default public file handle */
656 fid_t exi_rootfid;
657 /* For comparing V2 filehandles */
658 fhandle_t nullfh2;
659
660 /* The change attribute value of the root of nfs pseudo namespace */
661 timespec_t ns_root_change;
662 } nfs_export_t;
663
664 /*
665 * Functions that handle the NFSv4 server namespace
666 */
667 extern exportinfo_t *vis2exi(treenode_t *);
668 extern int treeclimb_export(struct exportinfo *);
669 extern void treeclimb_unexport(nfs_export_t *, struct exportinfo *);
670 extern int nfs_visible(struct exportinfo *, vnode_t *, int *);
671 extern int nfs_visible_inode(struct exportinfo *, ino64_t,
672 struct exp_visible **);
673 extern int has_visible(struct exportinfo *, vnode_t *);
674 extern void free_visible(struct exp_visible *);
675 extern int nfs_exported(struct exportinfo *, vnode_t *);
676 extern struct exportinfo *pseudo_exportfs(nfs_export_t *, vnode_t *, fid_t *,
677 struct exp_visible *, struct exportdata *);
678 extern int vop_fid_pseudo(vnode_t *, fid_t *);
679 extern int nfs4_vget_pseudo(struct exportinfo *, vnode_t **, fid_t *);
680 extern bool_t nfs_visible_change(struct exportinfo *, vnode_t *,
681 timespec_t *);
682 extern void tree_update_change(nfs_export_t *, treenode_t *, timespec_t *);
683
684 /*
685 * Functions that handle the NFSv4 server namespace security flavors
686 * information.
687 */
688 extern void srv_secinfo_exp2pseu(struct exportdata *, struct exportdata *);
689 extern void srv_secinfo_list_free(struct secinfo *, int);
690
691 extern nfs_export_t *nfs_get_export();
692 extern void export_link(nfs_export_t *, struct exportinfo *);
693 extern void export_unlink(nfs_export_t *, struct exportinfo *);
694
695 /*
696 * exi_id support
697 */
698 extern kmutex_t nfs_exi_id_lock;
699 extern avl_tree_t exi_id_tree;
700 extern int exi_id_get_next(void);
701
702 /*
703 * Two macros for identifying public filehandles.
704 * A v2 public filehandle is 32 zero bytes.
705 * A v3 public filehandle is zero length.
706 */
707 #define PUBLIC_FH2(fh) \
708 ((fh)->fh_fsid.val[1] == 0 && \
709 bcmp((fh), &nullfh2, sizeof (fhandle_t)) == 0)
710
711 #define PUBLIC_FH3(fh) \
712 ((fh)->fh3_length == 0)
713
714 extern int makefh4(nfs_fh4 *, struct vnode *, struct exportinfo *);
715 extern vnode_t *nfs4_fhtovp(nfs_fh4 *, struct exportinfo *, nfsstat4 *);
716
717 #endif /* _KERNEL */
718
719 #ifdef __cplusplus
720 }
721 #endif
722
723 #endif /* _NFS_EXPORT_H */