1 /* $NetBSD: nfs_nfsdport.c,v 1.4 2021/03/29 02:13:38 simonb Exp $ */
2 /*-
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Rick Macklem at The University of Guelph.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 */
34
35 #include <sys/cdefs.h>
36 /* __FBSDID("FreeBSD: head/sys/fs/nfsserver/nfs_nfsdport.c 308212 2016-11-02 12:43:15Z kib "); */
37 __RCSID("$NetBSD: nfs_nfsdport.c,v 1.4 2021/03/29 02:13:38 simonb Exp $");
38
39 #if 0
40 #include <sys/capsicum.h>
41 #endif
42
43 /*
44 * Functions that perform the vfs operations required by the routines in
45 * nfsd_serv.c. It is hoped that this change will make the server more
46 * portable.
47 */
48
49 #include <fs/nfs/common/nfsport.h>
50 #include <sys/hash.h>
51 #include <sys/sysctl.h>
52
53 #if 0
54 #include <nlm/nlm_prot.h>
55 #include <nlm/nlm.h>
56 #endif
57
58 FEATURE(nfsd, "NFSv4 server");
59
60 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
61 extern int nfsrv_useacl;
62 extern int newnfs_numnfsd;
63 extern struct mount nfsv4root_mnt;
64 extern struct nfsrv_stablefirst nfsrv_stablefirst;
65 extern void (*nfsd_call_servertimer)(void);
66 extern SVCPOOL *nfsrvd_pool;
67 extern struct nfsv4lock nfsd_suspend_lock;
68 extern struct nfsclienthashhead *nfsclienthash;
69 extern struct nfslockhashhead *nfslockhash;
70 extern struct nfssessionhash *nfssessionhash;
71 extern int nfsrv_sessionhashsize;
72 extern struct nfsstatsv1 nfsstatsv1;
73 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
74 NFSDLOCKMUTEX;
75 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
76 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
77 struct mtx nfsrc_udpmtx;
78 struct mtx nfs_v4root_mutex;
79 struct nfsrvfh nfs_rootfh, nfs_pubfh;
80 int nfs_pubfhset = 0, nfs_rootfhset = 0;
81 struct proc *nfsd_master_proc = NULL;
82 int nfsd_debuglevel = 0;
83 static pid_t nfsd_master_pid = (pid_t)-1;
84 static char nfsd_master_comm[MAXCOMLEN + 1];
85 static struct timeval nfsd_master_start;
86 static uint32_t nfsv4_sysid = 0;
87
88 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
89 struct ucred *);
90
91 int nfsrv_enable_crossmntpt = 1;
92 static int nfs_commit_blks;
93 static int nfs_commit_miss;
94 extern int nfsrv_issuedelegs;
95 extern int nfsrv_dolocallocks;
96 extern int nfsd_enable_stringtouid;
97
98 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
99 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
100 &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
101 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
102 0, "");
103 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
104 0, "");
105 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
106 &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
107 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
108 &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
109 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
110 0, "Debug level for NFS server");
111 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
112 &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
113
114 #define MAX_REORDERED_RPC 16
115 #define NUM_HEURISTIC 1031
116 #define NHUSE_INIT 64
117 #define NHUSE_INC 16
118 #define NHUSE_MAX 2048
119
120 static struct nfsheur {
121 struct vnode *nh_vp; /* vp to match (unreferenced pointer) */
122 off_t nh_nextoff; /* next offset for sequential detection */
123 int nh_use; /* use count for selection */
124 int nh_seqcount; /* heuristic */
125 } nfsheur[NUM_HEURISTIC];
126
127
128 /*
129 * Heuristic to detect sequential operation.
130 */
131 static struct nfsheur *
nfsrv_sequential_heuristic(struct uio * uio,struct vnode * vp)132 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
133 {
134 struct nfsheur *nh;
135 int hi, try;
136
137 /* Locate best candidate. */
138 try = 32;
139 hi = ((int)(vaddr_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
140 nh = &nfsheur[hi];
141 while (try--) {
142 if (nfsheur[hi].nh_vp == vp) {
143 nh = &nfsheur[hi];
144 break;
145 }
146 if (nfsheur[hi].nh_use > 0)
147 --nfsheur[hi].nh_use;
148 hi = (hi + 1) % NUM_HEURISTIC;
149 if (nfsheur[hi].nh_use < nh->nh_use)
150 nh = &nfsheur[hi];
151 }
152
153 /* Initialize hint if this is a new file. */
154 if (nh->nh_vp != vp) {
155 nh->nh_vp = vp;
156 nh->nh_nextoff = uio->uio_offset;
157 nh->nh_use = NHUSE_INIT;
158 if (uio->uio_offset == 0)
159 nh->nh_seqcount = 4;
160 else
161 nh->nh_seqcount = 1;
162 }
163
164 /* Calculate heuristic. */
165 if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
166 uio->uio_offset == nh->nh_nextoff) {
167 /* See comments in vfs_vnops.c:sequential_heuristic(). */
168 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
169 if (nh->nh_seqcount > IO_SEQMAX)
170 nh->nh_seqcount = IO_SEQMAX;
171 } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
172 imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
173 /* Probably a reordered RPC, leave seqcount alone. */
174 } else if (nh->nh_seqcount > 1) {
175 nh->nh_seqcount /= 2;
176 } else {
177 nh->nh_seqcount = 0;
178 }
179 nh->nh_use += NHUSE_INC;
180 if (nh->nh_use > NHUSE_MAX)
181 nh->nh_use = NHUSE_MAX;
182 return (nh);
183 }
184
185 /*
186 * Get attributes into nfsvattr structure.
187 */
188 int
nfsvno_getattr(struct vnode * vp,struct nfsvattr * nvap,struct ucred * cred,struct thread * p,int vpislocked)189 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
190 struct thread *p, int vpislocked)
191 {
192 int error, lockedit = 0;
193
194 if (vpislocked == 0) {
195 /*
196 * When vpislocked == 0, the vnode is either exclusively
197 * locked by this thread or not locked by this thread.
198 * As such, shared lock it, if not exclusively locked.
199 */
200 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
201 lockedit = 1;
202 NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
203 }
204 }
205 error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
206 if (lockedit != 0)
207 NFSVOPUNLOCK(vp, 0);
208
209 NFSEXITCODE(error);
210 return (error);
211 }
212
213 /*
214 * Get a file handle for a vnode.
215 */
216 int
nfsvno_getfh(struct vnode * vp,fhandle_t * fhp,struct thread * p)217 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
218 {
219 int error;
220
221 NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
222 fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
223 error = VOP_VPTOFH(vp, &fhp->fh_fid);
224
225 NFSEXITCODE(error);
226 return (error);
227 }
228
229 /*
230 * Perform access checking for vnodes obtained from file handles that would
231 * refer to files already opened by a Unix client. You cannot just use
232 * vn_writechk() and VOP_ACCESSX() for two reasons.
233 * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
234 * case.
235 * 2 - The owner is to be given access irrespective of mode bits for some
236 * operations, so that processes that chmod after opening a file don't
237 * break.
238 */
239 int
nfsvno_accchk(struct vnode * vp,accmode_t accmode,struct ucred * cred,struct nfsexstuff * exp,struct thread * p,int override,int vpislocked,u_int32_t * supportedtypep)240 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
241 struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
242 u_int32_t *supportedtypep)
243 {
244 struct vattr vattr;
245 int error = 0, getret = 0;
246
247 if (vpislocked == 0) {
248 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
249 error = EPERM;
250 goto out;
251 }
252 }
253 if (accmode & VWRITE) {
254 /* Just vn_writechk() changed to check rdonly */
255 /*
256 * Disallow write attempts on read-only file systems;
257 * unless the file is a socket or a block or character
258 * device resident on the file system.
259 */
260 if (NFSVNO_EXRDONLY(exp) ||
261 (vp->v_mount->mnt_flag & MNT_RDONLY)) {
262 switch (vp->v_type) {
263 case VREG:
264 case VDIR:
265 case VLNK:
266 error = EROFS;
267 default:
268 break;
269 }
270 }
271 /*
272 * If there's shared text associated with
273 * the inode, try to free it up once. If
274 * we fail, we can't allow writing.
275 */
276 if (VOP_IS_TEXT(vp) && error == 0)
277 error = ETXTBSY;
278 }
279 if (error != 0) {
280 if (vpislocked == 0)
281 NFSVOPUNLOCK(vp, 0);
282 goto out;
283 }
284
285 /*
286 * Should the override still be applied when ACLs are enabled?
287 */
288 error = VOP_ACCESSX(vp, accmode, cred, p);
289 if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
290 /*
291 * Try again with VEXPLICIT_DENY, to see if the test for
292 * deletion is supported.
293 */
294 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
295 if (error == 0) {
296 if (vp->v_type == VDIR) {
297 accmode &= ~(VDELETE | VDELETE_CHILD);
298 accmode |= VWRITE;
299 error = VOP_ACCESSX(vp, accmode, cred, p);
300 } else if (supportedtypep != NULL) {
301 *supportedtypep &= ~NFSACCESS_DELETE;
302 }
303 }
304 }
305
306 /*
307 * Allow certain operations for the owner (reads and writes
308 * on files that are already open).
309 */
310 if (override != NFSACCCHK_NOOVERRIDE &&
311 (error == EPERM || error == EACCES)) {
312 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
313 error = 0;
314 else if (override & NFSACCCHK_ALLOWOWNER) {
315 getret = VOP_GETATTR(vp, &vattr, cred);
316 if (getret == 0 && cred->cr_uid == vattr.va_uid)
317 error = 0;
318 }
319 }
320 if (vpislocked == 0)
321 NFSVOPUNLOCK(vp, 0);
322
323 out:
324 NFSEXITCODE(error);
325 return (error);
326 }
327
328 /*
329 * Set attribute(s) vnop.
330 */
331 int
nfsvno_setattr(struct vnode * vp,struct nfsvattr * nvap,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)332 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
333 struct thread *p, struct nfsexstuff *exp)
334 {
335 int error;
336
337 error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
338 NFSEXITCODE(error);
339 return (error);
340 }
341
342 /*
343 * Set up nameidata for a lookup() call and do it.
344 */
345 int
nfsvno_namei(struct nfsrv_descript * nd,struct nameidata * ndp,struct vnode * dp,int islocked,struct nfsexstuff * exp,struct thread * p,struct vnode ** retdirp)346 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
347 struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
348 struct vnode **retdirp)
349 {
350 struct componentname *cnp = &ndp->ni_cnd;
351 int i;
352 struct iovec aiov;
353 struct uio auio;
354 int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
355 int error = 0, crossmnt;
356 char *cp;
357
358 *retdirp = NULL;
359 cnp->cn_nameptr = cnp->cn_pnbuf;
360 ndp->ni_lcf = 0;
361 /*
362 * Extract and set starting directory.
363 */
364 if (dp->v_type != VDIR) {
365 if (islocked)
366 vput(dp);
367 else
368 vrele(dp);
369 nfsvno_relpathbuf(ndp);
370 error = ENOTDIR;
371 goto out1;
372 }
373 if (islocked)
374 NFSVOPUNLOCK(dp, 0);
375 VREF(dp);
376 *retdirp = dp;
377 if (NFSVNO_EXRDONLY(exp))
378 cnp->cn_flags |= RDONLY;
379 ndp->ni_segflg = UIO_SYSSPACE;
380 crossmnt = 1;
381
382 if (nd->nd_flag & ND_PUBLOOKUP) {
383 ndp->ni_loopcnt = 0;
384 if (cnp->cn_pnbuf[0] == '/') {
385 vrele(dp);
386 /*
387 * Check for degenerate pathnames here, since lookup()
388 * panics on them.
389 */
390 for (i = 1; i < ndp->ni_pathlen; i++)
391 if (cnp->cn_pnbuf[i] != '/')
392 break;
393 if (i == ndp->ni_pathlen) {
394 error = NFSERR_ACCES;
395 goto out;
396 }
397 dp = rootvnode;
398 VREF(dp);
399 }
400 } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
401 (nd->nd_flag & ND_NFSV4) == 0) {
402 /*
403 * Only cross mount points for NFSv4 when doing a
404 * mount while traversing the file system above
405 * the mount point, unless nfsrv_enable_crossmntpt is set.
406 */
407 cnp->cn_flags |= NOCROSSMOUNT;
408 crossmnt = 0;
409 }
410
411 /*
412 * Initialize for scan, set ni_startdir and bump ref on dp again
413 * because lookup() will dereference ni_startdir.
414 */
415
416 cnp->cn_thread = p;
417 ndp->ni_startdir = dp;
418 ndp->ni_rootdir = rootvnode;
419 ndp->ni_topdir = NULL;
420
421 if (!lockleaf)
422 cnp->cn_flags |= LOCKLEAF;
423 for (;;) {
424 cnp->cn_nameptr = cnp->cn_pnbuf;
425 /*
426 * Call lookup() to do the real work. If an error occurs,
427 * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
428 * we do not have to dereference anything before returning.
429 * In either case ni_startdir will be dereferenced and NULLed
430 * out.
431 */
432 error = lookup(ndp);
433 if (error)
434 break;
435
436 /*
437 * Check for encountering a symbolic link. Trivial
438 * termination occurs if no symlink encountered.
439 */
440 if ((cnp->cn_flags & ISSYMLINK) == 0) {
441 if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
442 nfsvno_relpathbuf(ndp);
443 if (ndp->ni_vp && !lockleaf)
444 NFSVOPUNLOCK(ndp->ni_vp, 0);
445 break;
446 }
447
448 /*
449 * Validate symlink
450 */
451 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
452 NFSVOPUNLOCK(ndp->ni_dvp, 0);
453 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
454 error = EINVAL;
455 goto badlink2;
456 }
457
458 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
459 error = ELOOP;
460 goto badlink2;
461 }
462 if (ndp->ni_pathlen > 1)
463 cp = uma_zalloc(namei_zone, M_WAITOK);
464 else
465 cp = cnp->cn_pnbuf;
466 aiov.iov_base = cp;
467 aiov.iov_len = MAXPATHLEN;
468 auio.uio_iov = &aiov;
469 auio.uio_iovcnt = 1;
470 auio.uio_offset = 0;
471 auio.uio_rw = UIO_READ;
472 auio.uio_segflg = UIO_SYSSPACE;
473 auio.uio_td = NULL;
474 auio.uio_resid = MAXPATHLEN;
475 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
476 if (error) {
477 badlink1:
478 if (ndp->ni_pathlen > 1)
479 uma_zfree(namei_zone, cp);
480 badlink2:
481 vrele(ndp->ni_dvp);
482 vput(ndp->ni_vp);
483 break;
484 }
485 linklen = MAXPATHLEN - auio.uio_resid;
486 if (linklen == 0) {
487 error = ENOENT;
488 goto badlink1;
489 }
490 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
491 error = ENAMETOOLONG;
492 goto badlink1;
493 }
494
495 /*
496 * Adjust or replace path
497 */
498 if (ndp->ni_pathlen > 1) {
499 NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
500 uma_zfree(namei_zone, cnp->cn_pnbuf);
501 cnp->cn_pnbuf = cp;
502 } else
503 cnp->cn_pnbuf[linklen] = '\0';
504 ndp->ni_pathlen += linklen;
505
506 /*
507 * Cleanup refs for next loop and check if root directory
508 * should replace current directory. Normally ni_dvp
509 * becomes the new base directory and is cleaned up when
510 * we loop. Explicitly null pointers after invalidation
511 * to clarify operation.
512 */
513 vput(ndp->ni_vp);
514 ndp->ni_vp = NULL;
515
516 if (cnp->cn_pnbuf[0] == '/') {
517 vrele(ndp->ni_dvp);
518 ndp->ni_dvp = ndp->ni_rootdir;
519 VREF(ndp->ni_dvp);
520 }
521 ndp->ni_startdir = ndp->ni_dvp;
522 ndp->ni_dvp = NULL;
523 }
524 if (!lockleaf)
525 cnp->cn_flags &= ~LOCKLEAF;
526
527 out:
528 if (error) {
529 nfsvno_relpathbuf(ndp);
530 ndp->ni_vp = NULL;
531 ndp->ni_dvp = NULL;
532 ndp->ni_startdir = NULL;
533 } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
534 ndp->ni_dvp = NULL;
535 }
536
537 out1:
538 NFSEXITCODE2(error, nd);
539 return (error);
540 }
541
542 /*
543 * Set up a pathname buffer and return a pointer to it and, optionally
544 * set a hash pointer.
545 */
546 void
nfsvno_setpathbuf(struct nameidata * ndp,char ** bufpp,u_long ** hashpp)547 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
548 {
549 struct componentname *cnp = &ndp->ni_cnd;
550
551 cnp->cn_flags |= (NOMACCHECK | HASBUF);
552 cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
553 if (hashpp != NULL)
554 *hashpp = NULL;
555 *bufpp = cnp->cn_pnbuf;
556 }
557
558 /*
559 * Release the above path buffer, if not released by nfsvno_namei().
560 */
561 void
nfsvno_relpathbuf(struct nameidata * ndp)562 nfsvno_relpathbuf(struct nameidata *ndp)
563 {
564
565 if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
566 panic("nfsrelpath");
567 uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
568 ndp->ni_cnd.cn_flags &= ~HASBUF;
569 }
570
571 /*
572 * Readlink vnode op into an mbuf list.
573 */
574 int
nfsvno_readlink(struct vnode * vp,struct ucred * cred,struct thread * p,struct mbuf ** mpp,struct mbuf ** mpendp,int * lenp)575 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
576 struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
577 {
578 struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
579 struct iovec *ivp = iv;
580 struct uio io, *uiop = &io;
581 struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
582 int i, len, tlen, error = 0;
583
584 len = 0;
585 i = 0;
586 while (len < NFS_MAXPATHLEN) {
587 NFSMGET(mp);
588 MCLGET(mp, M_WAITOK);
589 mp->m_len = M_SIZE(mp);
590 if (len == 0) {
591 mp3 = mp2 = mp;
592 } else {
593 mp2->m_next = mp;
594 mp2 = mp;
595 }
596 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
597 mp->m_len = NFS_MAXPATHLEN - len;
598 len = NFS_MAXPATHLEN;
599 } else {
600 len += mp->m_len;
601 }
602 ivp->iov_base = mtod(mp, caddr_t);
603 ivp->iov_len = mp->m_len;
604 i++;
605 ivp++;
606 }
607 uiop->uio_iov = iv;
608 uiop->uio_iovcnt = i;
609 uiop->uio_offset = 0;
610 uiop->uio_resid = len;
611 uiop->uio_rw = UIO_READ;
612 uiop->uio_segflg = UIO_SYSSPACE;
613 uiop->uio_td = NULL;
614 error = VOP_READLINK(vp, uiop, cred);
615 if (error) {
616 m_freem(mp3);
617 *lenp = 0;
618 goto out;
619 }
620 if (uiop->uio_resid > 0) {
621 len -= uiop->uio_resid;
622 tlen = NFSM_RNDUP(len);
623 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
624 }
625 *lenp = len;
626 *mpp = mp3;
627 *mpendp = mp;
628
629 out:
630 NFSEXITCODE(error);
631 return (error);
632 }
633
634 /*
635 * Read vnode op call into mbuf list.
636 */
637 int
nfsvno_read(struct vnode * vp,off_t off,int cnt,struct ucred * cred,struct thread * p,struct mbuf ** mpp,struct mbuf ** mpendp)638 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
639 struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
640 {
641 struct mbuf *m;
642 int i;
643 struct iovec *iv;
644 struct iovec *iv2;
645 int error = 0, len, left, siz, tlen, ioflag = 0;
646 struct mbuf *m2 = NULL, *m3;
647 struct uio io, *uiop = &io;
648 struct nfsheur *nh;
649
650 len = left = NFSM_RNDUP(cnt);
651 m3 = NULL;
652 /*
653 * Generate the mbuf list with the uio_iov ref. to it.
654 */
655 i = 0;
656 while (left > 0) {
657 NFSMGET(m);
658 MCLGET(m, M_WAITOK);
659 m->m_len = 0;
660 siz = uimin(M_TRAILINGSPACE(m), left);
661 left -= siz;
662 i++;
663 if (m3)
664 m2->m_next = m;
665 else
666 m3 = m;
667 m2 = m;
668 }
669 MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
670 M_TEMP, M_WAITOK);
671 uiop->uio_iov = iv2 = iv;
672 m = m3;
673 left = len;
674 i = 0;
675 while (left > 0) {
676 if (m == NULL)
677 panic("nfsvno_read iov");
678 siz = uimin(M_TRAILINGSPACE(m), left);
679 if (siz > 0) {
680 iv->iov_base = mtod(m, caddr_t) + m->m_len;
681 iv->iov_len = siz;
682 m->m_len += siz;
683 left -= siz;
684 iv++;
685 i++;
686 }
687 m = m->m_next;
688 }
689 uiop->uio_iovcnt = i;
690 uiop->uio_offset = off;
691 uiop->uio_resid = len;
692 uiop->uio_rw = UIO_READ;
693 uiop->uio_segflg = UIO_SYSSPACE;
694 uiop->uio_td = NULL;
695 nh = nfsrv_sequential_heuristic(uiop, vp);
696 ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
697 /* XXX KDM make this more systematic? */
698 nfsstatsv1.srvbytes[NFSV4OP_READ] += uiop->uio_resid;
699 error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
700 FREE((caddr_t)iv2, M_TEMP);
701 if (error) {
702 m_freem(m3);
703 *mpp = NULL;
704 goto out;
705 }
706 nh->nh_nextoff = uiop->uio_offset;
707 tlen = len - uiop->uio_resid;
708 cnt = cnt < tlen ? cnt : tlen;
709 tlen = NFSM_RNDUP(cnt);
710 if (tlen == 0) {
711 m_freem(m3);
712 m3 = NULL;
713 } else if (len != tlen || tlen != cnt)
714 nfsrv_adj(m3, len - tlen, tlen - cnt);
715 *mpp = m3;
716 *mpendp = m2;
717
718 out:
719 NFSEXITCODE(error);
720 return (error);
721 }
722
723 /*
724 * Write vnode op from an mbuf list.
725 */
726 int
nfsvno_write(struct vnode * vp,off_t off,int retlen,int cnt,int stable,struct mbuf * mp,char * cp,struct ucred * cred,struct thread * p)727 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
728 struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
729 {
730 struct iovec *ivp;
731 int i, len;
732 struct iovec *iv;
733 int ioflags, error;
734 struct uio io, *uiop = &io;
735 struct nfsheur *nh;
736
737 MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
738 M_WAITOK);
739 uiop->uio_iov = iv = ivp;
740 uiop->uio_iovcnt = cnt;
741 i = mtod(mp, caddr_t) + mp->m_len - cp;
742 len = retlen;
743 while (len > 0) {
744 if (mp == NULL)
745 panic("nfsvno_write");
746 if (i > 0) {
747 i = uimin(i, len);
748 ivp->iov_base = cp;
749 ivp->iov_len = i;
750 ivp++;
751 len -= i;
752 }
753 mp = mp->m_next;
754 if (mp) {
755 i = mp->m_len;
756 cp = mtod(mp, caddr_t);
757 }
758 }
759
760 if (stable == NFSWRITE_UNSTABLE)
761 ioflags = IO_NODELOCKED;
762 else
763 ioflags = (IO_SYNC | IO_NODELOCKED);
764 uiop->uio_resid = retlen;
765 uiop->uio_rw = UIO_WRITE;
766 uiop->uio_segflg = UIO_SYSSPACE;
767 NFSUIOPROC(uiop, p);
768 uiop->uio_offset = off;
769 nh = nfsrv_sequential_heuristic(uiop, vp);
770 ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
771 /* XXX KDM make this more systematic? */
772 nfsstatsv1.srvbytes[NFSV4OP_WRITE] += uiop->uio_resid;
773 error = VOP_WRITE(vp, uiop, ioflags, cred);
774 if (error == 0)
775 nh->nh_nextoff = uiop->uio_offset;
776 FREE((caddr_t)iv, M_TEMP);
777
778 NFSEXITCODE(error);
779 return (error);
780 }
781
782 /*
783 * Common code for creating a regular file (plus special files for V2).
784 */
785 int
nfsvno_createsub(struct nfsrv_descript * nd,struct nameidata * ndp,struct vnode ** vpp,struct nfsvattr * nvap,int * exclusive_flagp,int32_t * cverf,NFSDEV_T rdev,struct thread * p,struct nfsexstuff * exp)786 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
787 struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
788 int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
789 {
790 u_quad_t tempsize;
791 int error;
792
793 error = nd->nd_repstat;
794 if (!error && ndp->ni_vp == NULL) {
795 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
796 vrele(ndp->ni_startdir);
797 error = VOP_CREATE(ndp->ni_dvp,
798 &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
799 vput(ndp->ni_dvp);
800 nfsvno_relpathbuf(ndp);
801 if (!error) {
802 if (*exclusive_flagp) {
803 *exclusive_flagp = 0;
804 NFSVNO_ATTRINIT(nvap);
805 nvap->na_atime.tv_sec = cverf[0];
806 nvap->na_atime.tv_nsec = cverf[1];
807 error = VOP_SETATTR(ndp->ni_vp,
808 &nvap->na_vattr, nd->nd_cred);
809 if (error != 0) {
810 vput(ndp->ni_vp);
811 ndp->ni_vp = NULL;
812 error = NFSERR_NOTSUPP;
813 }
814 }
815 }
816 /*
817 * NFS V2 Only. nfsrvd_mknod() does this for V3.
818 * (This implies, just get out on an error.)
819 */
820 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
821 nvap->na_type == VFIFO) {
822 if (nvap->na_type == VCHR && rdev == 0xffffffff)
823 nvap->na_type = VFIFO;
824 if (nvap->na_type != VFIFO &&
825 (error = priv_check_cred(nd->nd_cred,
826 PRIV_VFS_MKNOD_DEV, 0))) {
827 vrele(ndp->ni_startdir);
828 nfsvno_relpathbuf(ndp);
829 vput(ndp->ni_dvp);
830 goto out;
831 }
832 nvap->na_rdev = rdev;
833 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
834 &ndp->ni_cnd, &nvap->na_vattr);
835 vput(ndp->ni_dvp);
836 nfsvno_relpathbuf(ndp);
837 vrele(ndp->ni_startdir);
838 if (error)
839 goto out;
840 } else {
841 vrele(ndp->ni_startdir);
842 nfsvno_relpathbuf(ndp);
843 vput(ndp->ni_dvp);
844 error = ENXIO;
845 goto out;
846 }
847 *vpp = ndp->ni_vp;
848 } else {
849 /*
850 * Handle cases where error is already set and/or
851 * the file exists.
852 * 1 - clean up the lookup
853 * 2 - iff !error and na_size set, truncate it
854 */
855 vrele(ndp->ni_startdir);
856 nfsvno_relpathbuf(ndp);
857 *vpp = ndp->ni_vp;
858 if (ndp->ni_dvp == *vpp)
859 vrele(ndp->ni_dvp);
860 else
861 vput(ndp->ni_dvp);
862 if (!error && nvap->na_size != VNOVAL) {
863 error = nfsvno_accchk(*vpp, VWRITE,
864 nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
865 NFSACCCHK_VPISLOCKED, NULL);
866 if (!error) {
867 tempsize = nvap->na_size;
868 NFSVNO_ATTRINIT(nvap);
869 nvap->na_size = tempsize;
870 error = VOP_SETATTR(*vpp,
871 &nvap->na_vattr, nd->nd_cred);
872 }
873 }
874 if (error)
875 vput(*vpp);
876 }
877
878 out:
879 NFSEXITCODE(error);
880 return (error);
881 }
882
883 /*
884 * Do a mknod vnode op.
885 */
886 int
nfsvno_mknod(struct nameidata * ndp,struct nfsvattr * nvap,struct ucred * cred,struct thread * p)887 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
888 struct thread *p)
889 {
890 int error = 0;
891 enum vtype vtyp;
892
893 vtyp = nvap->na_type;
894 /*
895 * Iff doesn't exist, create it.
896 */
897 if (ndp->ni_vp) {
898 vrele(ndp->ni_startdir);
899 nfsvno_relpathbuf(ndp);
900 vput(ndp->ni_dvp);
901 vrele(ndp->ni_vp);
902 error = EEXIST;
903 goto out;
904 }
905 if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
906 vrele(ndp->ni_startdir);
907 nfsvno_relpathbuf(ndp);
908 vput(ndp->ni_dvp);
909 error = NFSERR_BADTYPE;
910 goto out;
911 }
912 if (vtyp == VSOCK) {
913 vrele(ndp->ni_startdir);
914 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
915 &ndp->ni_cnd, &nvap->na_vattr);
916 vput(ndp->ni_dvp);
917 nfsvno_relpathbuf(ndp);
918 } else {
919 if (nvap->na_type != VFIFO &&
920 (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
921 vrele(ndp->ni_startdir);
922 nfsvno_relpathbuf(ndp);
923 vput(ndp->ni_dvp);
924 goto out;
925 }
926 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
927 &ndp->ni_cnd, &nvap->na_vattr);
928 vput(ndp->ni_dvp);
929 nfsvno_relpathbuf(ndp);
930 vrele(ndp->ni_startdir);
931 /*
932 * Since VOP_MKNOD returns the ni_vp, I can't
933 * see any reason to do the lookup.
934 */
935 }
936
937 out:
938 NFSEXITCODE(error);
939 return (error);
940 }
941
942 /*
943 * Mkdir vnode op.
944 */
945 int
nfsvno_mkdir(struct nameidata * ndp,struct nfsvattr * nvap,uid_t saved_uid,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)946 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
947 struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
948 {
949 int error = 0;
950
951 if (ndp->ni_vp != NULL) {
952 if (ndp->ni_dvp == ndp->ni_vp)
953 vrele(ndp->ni_dvp);
954 else
955 vput(ndp->ni_dvp);
956 vrele(ndp->ni_vp);
957 nfsvno_relpathbuf(ndp);
958 error = EEXIST;
959 goto out;
960 }
961 error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
962 &nvap->na_vattr);
963 vput(ndp->ni_dvp);
964 nfsvno_relpathbuf(ndp);
965
966 out:
967 NFSEXITCODE(error);
968 return (error);
969 }
970
971 /*
972 * symlink vnode op.
973 */
974 int
nfsvno_symlink(struct nameidata * ndp,struct nfsvattr * nvap,char * pathcp,int pathlen,int not_v2,uid_t saved_uid,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)975 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
976 int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
977 struct nfsexstuff *exp)
978 {
979 int error = 0;
980
981 if (ndp->ni_vp) {
982 vrele(ndp->ni_startdir);
983 nfsvno_relpathbuf(ndp);
984 if (ndp->ni_dvp == ndp->ni_vp)
985 vrele(ndp->ni_dvp);
986 else
987 vput(ndp->ni_dvp);
988 vrele(ndp->ni_vp);
989 error = EEXIST;
990 goto out;
991 }
992
993 error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
994 &nvap->na_vattr, pathcp);
995 vput(ndp->ni_dvp);
996 vrele(ndp->ni_startdir);
997 nfsvno_relpathbuf(ndp);
998 /*
999 * Although FreeBSD still had the lookup code in
1000 * it for 7/current, there doesn't seem to be any
1001 * point, since VOP_SYMLINK() returns the ni_vp.
1002 * Just vput it for v2.
1003 */
1004 if (!not_v2 && !error)
1005 vput(ndp->ni_vp);
1006
1007 out:
1008 NFSEXITCODE(error);
1009 return (error);
1010 }
1011
1012 /*
1013 * Parse symbolic link arguments.
1014 * This function has an ugly side effect. It will MALLOC() an area for
1015 * the symlink and set iov_base to point to it, only if it succeeds.
1016 * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
1017 * be FREE'd later.
1018 */
1019 int
nfsvno_getsymlink(struct nfsrv_descript * nd,struct nfsvattr * nvap,struct thread * p,char ** pathcpp,int * lenp)1020 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
1021 struct thread *p, char **pathcpp, int *lenp)
1022 {
1023 u_int32_t *tl;
1024 char *pathcp = NULL;
1025 int error = 0, len;
1026 struct nfsv2_sattr *sp;
1027
1028 *pathcpp = NULL;
1029 *lenp = 0;
1030 if ((nd->nd_flag & ND_NFSV3) &&
1031 (error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
1032 goto nfsmout;
1033 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
1034 len = fxdr_unsigned(int, *tl);
1035 if (len > NFS_MAXPATHLEN || len <= 0) {
1036 error = EBADRPC;
1037 goto nfsmout;
1038 }
1039 MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
1040 error = nfsrv_mtostr(nd, pathcp, len);
1041 if (error)
1042 goto nfsmout;
1043 if (nd->nd_flag & ND_NFSV2) {
1044 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1045 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1046 }
1047 *pathcpp = pathcp;
1048 *lenp = len;
1049 NFSEXITCODE2(0, nd);
1050 return (0);
1051 nfsmout:
1052 if (pathcp)
1053 free(pathcp, M_TEMP);
1054 NFSEXITCODE2(error, nd);
1055 return (error);
1056 }
1057
1058 /*
1059 * Remove a non-directory object.
1060 */
1061 int
nfsvno_removesub(struct nameidata * ndp,int is_v4,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)1062 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1063 struct thread *p, struct nfsexstuff *exp)
1064 {
1065 struct vnode *vp;
1066 int error = 0;
1067
1068 vp = ndp->ni_vp;
1069 if (vp->v_type == VDIR)
1070 error = NFSERR_ISDIR;
1071 else if (is_v4)
1072 error = nfsrv_checkremove(vp, 1, p);
1073 if (!error)
1074 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1075 if (ndp->ni_dvp == vp)
1076 vrele(ndp->ni_dvp);
1077 else
1078 vput(ndp->ni_dvp);
1079 vput(vp);
1080 if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1081 nfsvno_relpathbuf(ndp);
1082 NFSEXITCODE(error);
1083 return (error);
1084 }
1085
1086 /*
1087 * Remove a directory.
1088 */
1089 int
nfsvno_rmdirsub(struct nameidata * ndp,int is_v4,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)1090 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1091 struct thread *p, struct nfsexstuff *exp)
1092 {
1093 struct vnode *vp;
1094 int error = 0;
1095
1096 vp = ndp->ni_vp;
1097 if (vp->v_type != VDIR) {
1098 error = ENOTDIR;
1099 goto out;
1100 }
1101 /*
1102 * No rmdir "." please.
1103 */
1104 if (ndp->ni_dvp == vp) {
1105 error = EINVAL;
1106 goto out;
1107 }
1108 /*
1109 * The root of a mounted filesystem cannot be deleted.
1110 */
1111 if (vp->v_vflag & VV_ROOT)
1112 error = EBUSY;
1113 out:
1114 if (!error)
1115 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1116 if (ndp->ni_dvp == vp)
1117 vrele(ndp->ni_dvp);
1118 else
1119 vput(ndp->ni_dvp);
1120 vput(vp);
1121 if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1122 nfsvno_relpathbuf(ndp);
1123 NFSEXITCODE(error);
1124 return (error);
1125 }
1126
1127 /*
1128 * Rename vnode op.
1129 */
1130 int
nfsvno_rename(struct nameidata * fromndp,struct nameidata * tondp,u_int32_t ndstat,u_int32_t ndflag,struct ucred * cred,struct thread * p)1131 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1132 u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1133 {
1134 struct vnode *fvp, *tvp, *tdvp;
1135 int error = 0;
1136
1137 fvp = fromndp->ni_vp;
1138 if (ndstat) {
1139 vrele(fromndp->ni_dvp);
1140 vrele(fvp);
1141 error = ndstat;
1142 goto out1;
1143 }
1144 tdvp = tondp->ni_dvp;
1145 tvp = tondp->ni_vp;
1146 if (tvp != NULL) {
1147 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1148 error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1149 goto out;
1150 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1151 error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1152 goto out;
1153 }
1154 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1155 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1156 goto out;
1157 }
1158
1159 /*
1160 * A rename to '.' or '..' results in a prematurely
1161 * unlocked vnode on FreeBSD5, so I'm just going to fail that
1162 * here.
1163 */
1164 if ((tondp->ni_cnd.cn_namelen == 1 &&
1165 tondp->ni_cnd.cn_nameptr[0] == '.') ||
1166 (tondp->ni_cnd.cn_namelen == 2 &&
1167 tondp->ni_cnd.cn_nameptr[0] == '.' &&
1168 tondp->ni_cnd.cn_nameptr[1] == '.')) {
1169 error = EINVAL;
1170 goto out;
1171 }
1172 }
1173 if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1174 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1175 goto out;
1176 }
1177 if (fvp->v_mount != tdvp->v_mount) {
1178 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1179 goto out;
1180 }
1181 if (fvp == tdvp) {
1182 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1183 goto out;
1184 }
1185 if (fvp == tvp) {
1186 /*
1187 * If source and destination are the same, there is nothing to
1188 * do. Set error to -1 to indicate this.
1189 */
1190 error = -1;
1191 goto out;
1192 }
1193 if (ndflag & ND_NFSV4) {
1194 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1195 error = nfsrv_checkremove(fvp, 0, p);
1196 NFSVOPUNLOCK(fvp, 0);
1197 } else
1198 error = EPERM;
1199 if (tvp && !error)
1200 error = nfsrv_checkremove(tvp, 1, p);
1201 } else {
1202 /*
1203 * For NFSv2 and NFSv3, try to get rid of the delegation, so
1204 * that the NFSv4 client won't be confused by the rename.
1205 * Since nfsd_recalldelegation() can only be called on an
1206 * unlocked vnode at this point and fvp is the file that will
1207 * still exist after the rename, just do fvp.
1208 */
1209 nfsd_recalldelegation(fvp, p);
1210 }
1211 out:
1212 if (!error) {
1213 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1214 &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1215 &tondp->ni_cnd);
1216 } else {
1217 if (tdvp == tvp)
1218 vrele(tdvp);
1219 else
1220 vput(tdvp);
1221 if (tvp)
1222 vput(tvp);
1223 vrele(fromndp->ni_dvp);
1224 vrele(fvp);
1225 if (error == -1)
1226 error = 0;
1227 }
1228 vrele(tondp->ni_startdir);
1229 nfsvno_relpathbuf(tondp);
1230 out1:
1231 vrele(fromndp->ni_startdir);
1232 nfsvno_relpathbuf(fromndp);
1233 NFSEXITCODE(error);
1234 return (error);
1235 }
1236
1237 /*
1238 * Link vnode op.
1239 */
1240 int
nfsvno_link(struct nameidata * ndp,struct vnode * vp,struct ucred * cred,struct thread * p,struct nfsexstuff * exp)1241 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1242 struct thread *p, struct nfsexstuff *exp)
1243 {
1244 struct vnode *xp;
1245 int error = 0;
1246
1247 xp = ndp->ni_vp;
1248 if (xp != NULL) {
1249 error = EEXIST;
1250 } else {
1251 xp = ndp->ni_dvp;
1252 if (vp->v_mount != xp->v_mount)
1253 error = EXDEV;
1254 }
1255 if (!error) {
1256 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1257 if ((vp->v_iflag & VI_DOOMED) == 0)
1258 error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1259 else
1260 error = EPERM;
1261 if (ndp->ni_dvp == vp)
1262 vrele(ndp->ni_dvp);
1263 else
1264 vput(ndp->ni_dvp);
1265 NFSVOPUNLOCK(vp, 0);
1266 } else {
1267 if (ndp->ni_dvp == ndp->ni_vp)
1268 vrele(ndp->ni_dvp);
1269 else
1270 vput(ndp->ni_dvp);
1271 if (ndp->ni_vp)
1272 vrele(ndp->ni_vp);
1273 }
1274 nfsvno_relpathbuf(ndp);
1275 NFSEXITCODE(error);
1276 return (error);
1277 }
1278
1279 /*
1280 * Do the fsync() appropriate for the commit.
1281 */
1282 int
nfsvno_fsync(struct vnode * vp,u_int64_t off,int cnt,struct ucred * cred,struct thread * td)1283 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1284 struct thread *td)
1285 {
1286 int error = 0;
1287
1288 /*
1289 * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
1290 * file is done. At this time VOP_FSYNC does not accept offset and
1291 * byte count parameters so call VOP_FSYNC the whole file for now.
1292 * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
1293 * File systems that do not use the buffer cache (as indicated
1294 * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
1295 */
1296 if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
1297 (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
1298 /*
1299 * Give up and do the whole thing
1300 */
1301 if (vp->v_object &&
1302 (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1303 VM_OBJECT_WLOCK(vp->v_object);
1304 vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1305 VM_OBJECT_WUNLOCK(vp->v_object);
1306 }
1307 error = VOP_FSYNC(vp, MNT_WAIT, td);
1308 } else {
1309 /*
1310 * Locate and synchronously write any buffers that fall
1311 * into the requested range. Note: we are assuming that
1312 * f_iosize is a power of 2.
1313 */
1314 int iosize = vp->v_mount->mnt_stat.f_iosize;
1315 int iomask = iosize - 1;
1316 struct bufobj *bo;
1317 daddr_t lblkno;
1318
1319 /*
1320 * Align to iosize boundary, super-align to page boundary.
1321 */
1322 if (off & iomask) {
1323 cnt += off & iomask;
1324 off &= ~(u_quad_t)iomask;
1325 }
1326 if (off & PAGE_MASK) {
1327 cnt += off & PAGE_MASK;
1328 off &= ~(u_quad_t)PAGE_MASK;
1329 }
1330 lblkno = off / iosize;
1331
1332 if (vp->v_object &&
1333 (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1334 VM_OBJECT_WLOCK(vp->v_object);
1335 vm_object_page_clean(vp->v_object, off, off + cnt,
1336 OBJPC_SYNC);
1337 VM_OBJECT_WUNLOCK(vp->v_object);
1338 }
1339
1340 bo = &vp->v_bufobj;
1341 BO_LOCK(bo);
1342 while (cnt > 0) {
1343 struct buf *bp;
1344
1345 /*
1346 * If we have a buffer and it is marked B_DELWRI we
1347 * have to lock and write it. Otherwise the prior
1348 * write is assumed to have already been committed.
1349 *
1350 * gbincore() can return invalid buffers now so we
1351 * have to check that bit as well (though B_DELWRI
1352 * should not be set if B_INVAL is set there could be
1353 * a race here since we haven't locked the buffer).
1354 */
1355 if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1356 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1357 LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
1358 BO_LOCK(bo);
1359 continue; /* retry */
1360 }
1361 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1362 B_DELWRI) {
1363 bremfree(bp);
1364 bp->b_flags &= ~B_ASYNC;
1365 bwrite(bp);
1366 ++nfs_commit_miss;
1367 } else
1368 BUF_UNLOCK(bp);
1369 BO_LOCK(bo);
1370 }
1371 ++nfs_commit_blks;
1372 if (cnt < iosize)
1373 break;
1374 cnt -= iosize;
1375 ++lblkno;
1376 }
1377 BO_UNLOCK(bo);
1378 }
1379 NFSEXITCODE(error);
1380 return (error);
1381 }
1382
1383 /*
1384 * Statfs vnode op.
1385 */
1386 int
nfsvno_statfs(struct vnode * vp,struct statfs * sf)1387 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1388 {
1389 int error;
1390
1391 error = VFS_STATFS(vp->v_mount, sf);
1392 if (error == 0) {
1393 /*
1394 * Since NFS handles these values as unsigned on the
1395 * wire, there is no way to represent negative values,
1396 * so set them to 0. Without this, they will appear
1397 * to be very large positive values for clients like
1398 * Solaris10.
1399 */
1400 if (sf->f_bavail < 0)
1401 sf->f_bavail = 0;
1402 if (sf->f_ffree < 0)
1403 sf->f_ffree = 0;
1404 }
1405 NFSEXITCODE(error);
1406 return (error);
1407 }
1408
1409 /*
1410 * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1411 * must handle nfsrv_opencheck() calls after any other access checks.
1412 */
1413 void
nfsvno_open(struct nfsrv_descript * nd,struct nameidata * ndp,nfsquad_t clientid,nfsv4stateid_t * stateidp,struct nfsstate * stp,int * exclusive_flagp,struct nfsvattr * nvap,int32_t * cverf,int create,NFSACL_T * aclp,nfsattrbit_t * attrbitp,struct ucred * cred,struct thread * p,struct nfsexstuff * exp,struct vnode ** vpp)1414 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1415 nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1416 int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1417 NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1418 struct nfsexstuff *exp, struct vnode **vpp)
1419 {
1420 struct vnode *vp = NULL;
1421 u_quad_t tempsize;
1422 struct nfsexstuff nes;
1423
1424 if (ndp->ni_vp == NULL)
1425 nd->nd_repstat = nfsrv_opencheck(clientid,
1426 stateidp, stp, NULL, nd, p, nd->nd_repstat);
1427 if (!nd->nd_repstat) {
1428 if (ndp->ni_vp == NULL) {
1429 vrele(ndp->ni_startdir);
1430 nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1431 &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1432 vput(ndp->ni_dvp);
1433 nfsvno_relpathbuf(ndp);
1434 if (!nd->nd_repstat) {
1435 if (*exclusive_flagp) {
1436 *exclusive_flagp = 0;
1437 NFSVNO_ATTRINIT(nvap);
1438 nvap->na_atime.tv_sec = cverf[0];
1439 nvap->na_atime.tv_nsec = cverf[1];
1440 nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1441 &nvap->na_vattr, cred);
1442 if (nd->nd_repstat != 0) {
1443 vput(ndp->ni_vp);
1444 ndp->ni_vp = NULL;
1445 nd->nd_repstat = NFSERR_NOTSUPP;
1446 }
1447 } else {
1448 nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1449 aclp, p, attrbitp, exp);
1450 }
1451 }
1452 vp = ndp->ni_vp;
1453 } else {
1454 if (ndp->ni_startdir)
1455 vrele(ndp->ni_startdir);
1456 nfsvno_relpathbuf(ndp);
1457 vp = ndp->ni_vp;
1458 if (create == NFSV4OPEN_CREATE) {
1459 if (ndp->ni_dvp == vp)
1460 vrele(ndp->ni_dvp);
1461 else
1462 vput(ndp->ni_dvp);
1463 }
1464 if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1465 if (ndp->ni_cnd.cn_flags & RDONLY)
1466 NFSVNO_SETEXRDONLY(&nes);
1467 else
1468 NFSVNO_EXINIT(&nes);
1469 nd->nd_repstat = nfsvno_accchk(vp,
1470 VWRITE, cred, &nes, p,
1471 NFSACCCHK_NOOVERRIDE,
1472 NFSACCCHK_VPISLOCKED, NULL);
1473 nd->nd_repstat = nfsrv_opencheck(clientid,
1474 stateidp, stp, vp, nd, p, nd->nd_repstat);
1475 if (!nd->nd_repstat) {
1476 tempsize = nvap->na_size;
1477 NFSVNO_ATTRINIT(nvap);
1478 nvap->na_size = tempsize;
1479 nd->nd_repstat = VOP_SETATTR(vp,
1480 &nvap->na_vattr, cred);
1481 }
1482 } else if (vp->v_type == VREG) {
1483 nd->nd_repstat = nfsrv_opencheck(clientid,
1484 stateidp, stp, vp, nd, p, nd->nd_repstat);
1485 }
1486 }
1487 } else {
1488 if (ndp->ni_cnd.cn_flags & HASBUF)
1489 nfsvno_relpathbuf(ndp);
1490 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1491 vrele(ndp->ni_startdir);
1492 if (ndp->ni_dvp == ndp->ni_vp)
1493 vrele(ndp->ni_dvp);
1494 else
1495 vput(ndp->ni_dvp);
1496 if (ndp->ni_vp)
1497 vput(ndp->ni_vp);
1498 }
1499 }
1500 *vpp = vp;
1501
1502 NFSEXITCODE2(0, nd);
1503 }
1504
1505 /*
1506 * Updates the file rev and sets the mtime and ctime
1507 * to the current clock time, returning the va_filerev and va_Xtime
1508 * values.
1509 * Return ESTALE to indicate the vnode is VI_DOOMED.
1510 */
1511 int
nfsvno_updfilerev(struct vnode * vp,struct nfsvattr * nvap,struct ucred * cred,struct thread * p)1512 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1513 struct ucred *cred, struct thread *p)
1514 {
1515 struct vattr va;
1516
1517 VATTR_NULL(&va);
1518 vfs_timestamp(&va.va_mtime);
1519 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
1520 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
1521 if ((vp->v_iflag & VI_DOOMED) != 0)
1522 return (ESTALE);
1523 }
1524 (void) VOP_SETATTR(vp, &va, cred);
1525 (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1526 return (0);
1527 }
1528
1529 /*
1530 * Glue routine to nfsv4_fillattr().
1531 */
1532 int
nfsvno_fillattr(struct nfsrv_descript * nd,struct mount * mp,struct vnode * vp,struct nfsvattr * nvap,fhandle_t * fhp,int rderror,nfsattrbit_t * attrbitp,struct ucred * cred,struct thread * p,int isdgram,int reterr,int supports_nfsv4acls,int at_root,uint64_t mounted_on_fileno)1533 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1534 struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1535 struct ucred *cred, struct thread *p, int isdgram, int reterr,
1536 int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1537 {
1538 int error;
1539
1540 error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1541 attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1542 mounted_on_fileno);
1543 NFSEXITCODE2(0, nd);
1544 return (error);
1545 }
1546
1547 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1548 /*
1549 * nfs readdir service
1550 * - mallocs what it thinks is enough to read
1551 * count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1552 * - calls VOP_READDIR()
1553 * - loops around building the reply
1554 * if the output generated exceeds count break out of loop
1555 * The NFSM_CLGET macro is used here so that the reply will be packed
1556 * tightly in mbuf clusters.
1557 * - it trims out records with d_fileno == 0
1558 * this doesn't matter for Unix clients, but they might confuse clients
1559 * for other os'.
1560 * - it trims out records with d_type == DT_WHT
1561 * these cannot be seen through NFS (unless we extend the protocol)
1562 * The alternate call nfsrvd_readdirplus() does lookups as well.
1563 * PS: The NFS protocol spec. does not clarify what the "count" byte
1564 * argument is a count of.. just name strings and file id's or the
1565 * entire reply rpc or ...
1566 * I tried just file name and id sizes and it confused the Sun client,
1567 * so I am using the full rpc size now. The "paranoia.." comment refers
1568 * to including the status longwords that are not a part of the dir.
1569 * "entry" structures, but are in the rpc.
1570 */
1571 int
nfsrvd_readdir(struct nfsrv_descript * nd,int isdgram,struct vnode * vp,struct thread * p,struct nfsexstuff * exp)1572 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1573 struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1574 {
1575 struct dirent *dp;
1576 u_int32_t *tl;
1577 int dirlen;
1578 char *cpos, *cend, *rbuf;
1579 struct nfsvattr at;
1580 int nlen, error = 0, getret = 1;
1581 int siz, cnt, fullsiz, eofflag, ncookies;
1582 u_int64_t off, toff, verf;
1583 u_long *cookies = NULL, *cookiep;
1584 struct uio io;
1585 struct iovec iv;
1586 int is_ufs;
1587
1588 if (nd->nd_repstat) {
1589 nfsrv_postopattr(nd, getret, &at);
1590 goto out;
1591 }
1592 if (nd->nd_flag & ND_NFSV2) {
1593 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1594 off = fxdr_unsigned(u_quad_t, *tl++);
1595 } else {
1596 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1597 off = fxdr_hyper(tl);
1598 tl += 2;
1599 verf = fxdr_hyper(tl);
1600 tl += 2;
1601 }
1602 toff = off;
1603 cnt = fxdr_unsigned(int, *tl);
1604 if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1605 cnt = NFS_SRVMAXDATA(nd);
1606 siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1607 fullsiz = siz;
1608 if (nd->nd_flag & ND_NFSV3) {
1609 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1610 p, 1);
1611 #if 0
1612 /*
1613 * va_filerev is not sufficient as a cookie verifier,
1614 * since it is not supposed to change when entries are
1615 * removed/added unless that offset cookies returned to
1616 * the client are no longer valid.
1617 */
1618 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1619 nd->nd_repstat = NFSERR_BAD_COOKIE;
1620 #endif
1621 }
1622 if (!nd->nd_repstat && vp->v_type != VDIR)
1623 nd->nd_repstat = NFSERR_NOTDIR;
1624 if (nd->nd_repstat == 0 && cnt == 0) {
1625 if (nd->nd_flag & ND_NFSV2)
1626 /* NFSv2 does not have NFSERR_TOOSMALL */
1627 nd->nd_repstat = EPERM;
1628 else
1629 nd->nd_repstat = NFSERR_TOOSMALL;
1630 }
1631 if (!nd->nd_repstat)
1632 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1633 nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1634 NFSACCCHK_VPISLOCKED, NULL);
1635 if (nd->nd_repstat) {
1636 vput(vp);
1637 if (nd->nd_flag & ND_NFSV3)
1638 nfsrv_postopattr(nd, getret, &at);
1639 goto out;
1640 }
1641 is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1642 MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1643 again:
1644 eofflag = 0;
1645 if (cookies) {
1646 free((caddr_t)cookies, M_TEMP);
1647 cookies = NULL;
1648 }
1649
1650 iv.iov_base = rbuf;
1651 iv.iov_len = siz;
1652 io.uio_iov = &iv;
1653 io.uio_iovcnt = 1;
1654 io.uio_offset = (off_t)off;
1655 io.uio_resid = siz;
1656 io.uio_segflg = UIO_SYSSPACE;
1657 io.uio_rw = UIO_READ;
1658 io.uio_td = NULL;
1659 nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1660 &cookies);
1661 off = (u_int64_t)io.uio_offset;
1662 if (io.uio_resid)
1663 siz -= io.uio_resid;
1664
1665 if (!cookies && !nd->nd_repstat)
1666 nd->nd_repstat = NFSERR_PERM;
1667 if (nd->nd_flag & ND_NFSV3) {
1668 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1669 if (!nd->nd_repstat)
1670 nd->nd_repstat = getret;
1671 }
1672
1673 /*
1674 * Handles the failed cases. nd->nd_repstat == 0 past here.
1675 */
1676 if (nd->nd_repstat) {
1677 vput(vp);
1678 free((caddr_t)rbuf, M_TEMP);
1679 if (cookies)
1680 free((caddr_t)cookies, M_TEMP);
1681 if (nd->nd_flag & ND_NFSV3)
1682 nfsrv_postopattr(nd, getret, &at);
1683 goto out;
1684 }
1685 /*
1686 * If nothing read, return eof
1687 * rpc reply
1688 */
1689 if (siz == 0) {
1690 vput(vp);
1691 if (nd->nd_flag & ND_NFSV2) {
1692 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1693 } else {
1694 nfsrv_postopattr(nd, getret, &at);
1695 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1696 txdr_hyper(at.na_filerev, tl);
1697 tl += 2;
1698 }
1699 *tl++ = newnfs_false;
1700 *tl = newnfs_true;
1701 FREE((caddr_t)rbuf, M_TEMP);
1702 FREE((caddr_t)cookies, M_TEMP);
1703 goto out;
1704 }
1705
1706 /*
1707 * Check for degenerate cases of nothing useful read.
1708 * If so go try again
1709 */
1710 cpos = rbuf;
1711 cend = rbuf + siz;
1712 dp = (struct dirent *)cpos;
1713 cookiep = cookies;
1714
1715 /*
1716 * For some reason FreeBSD's ufs_readdir() chooses to back the
1717 * directory offset up to a block boundary, so it is necessary to
1718 * skip over the records that precede the requested offset. This
1719 * requires the assumption that file offset cookies monotonically
1720 * increase.
1721 */
1722 while (cpos < cend && ncookies > 0 &&
1723 (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1724 (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
1725 cpos += dp->d_reclen;
1726 dp = (struct dirent *)cpos;
1727 cookiep++;
1728 ncookies--;
1729 }
1730 if (cpos >= cend || ncookies == 0) {
1731 siz = fullsiz;
1732 toff = off;
1733 goto again;
1734 }
1735 vput(vp);
1736
1737 /*
1738 * dirlen is the size of the reply, including all XDR and must
1739 * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1740 * if the XDR should be included in "count", but to be safe, we do.
1741 * (Include the two booleans at the end of the reply in dirlen now.)
1742 */
1743 if (nd->nd_flag & ND_NFSV3) {
1744 nfsrv_postopattr(nd, getret, &at);
1745 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1746 txdr_hyper(at.na_filerev, tl);
1747 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1748 } else {
1749 dirlen = 2 * NFSX_UNSIGNED;
1750 }
1751
1752 /* Loop through the records and build reply */
1753 while (cpos < cend && ncookies > 0) {
1754 nlen = dp->d_namlen;
1755 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1756 nlen <= NFS_MAXNAMLEN) {
1757 if (nd->nd_flag & ND_NFSV3)
1758 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1759 else
1760 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1761 if (dirlen > cnt) {
1762 eofflag = 0;
1763 break;
1764 }
1765
1766 /*
1767 * Build the directory record xdr from
1768 * the dirent entry.
1769 */
1770 if (nd->nd_flag & ND_NFSV3) {
1771 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1772 *tl++ = newnfs_true;
1773 *tl++ = 0;
1774 } else {
1775 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1776 *tl++ = newnfs_true;
1777 }
1778 *tl = txdr_unsigned(dp->d_fileno);
1779 (void) nfsm_strtom(nd, dp->d_name, nlen);
1780 if (nd->nd_flag & ND_NFSV3) {
1781 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1782 *tl++ = 0;
1783 } else
1784 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1785 *tl = txdr_unsigned(*cookiep);
1786 }
1787 cpos += dp->d_reclen;
1788 dp = (struct dirent *)cpos;
1789 cookiep++;
1790 ncookies--;
1791 }
1792 if (cpos < cend)
1793 eofflag = 0;
1794 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1795 *tl++ = newnfs_false;
1796 if (eofflag)
1797 *tl = newnfs_true;
1798 else
1799 *tl = newnfs_false;
1800 FREE((caddr_t)rbuf, M_TEMP);
1801 FREE((caddr_t)cookies, M_TEMP);
1802
1803 out:
1804 NFSEXITCODE2(0, nd);
1805 return (0);
1806 nfsmout:
1807 vput(vp);
1808 NFSEXITCODE2(error, nd);
1809 return (error);
1810 }
1811
1812 /*
1813 * Readdirplus for V3 and Readdir for V4.
1814 */
1815 int
nfsrvd_readdirplus(struct nfsrv_descript * nd,int isdgram,struct vnode * vp,struct thread * p,struct nfsexstuff * exp)1816 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1817 struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1818 {
1819 struct dirent *dp;
1820 u_int32_t *tl;
1821 int dirlen;
1822 char *cpos, *cend, *rbuf;
1823 struct vnode *nvp;
1824 fhandle_t nfh;
1825 struct nfsvattr nva, at, *nvap = &nva;
1826 struct mbuf *mb0, *mb1;
1827 struct nfsreferral *refp;
1828 int nlen, r, error = 0, getret = 1, usevget = 1;
1829 int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1830 caddr_t bpos0, bpos1;
1831 u_int64_t off, toff, verf;
1832 u_long *cookies = NULL, *cookiep;
1833 nfsattrbit_t attrbits, rderrbits, savbits;
1834 struct uio io;
1835 struct iovec iv;
1836 struct componentname cn;
1837 int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
1838 struct mount *mp, *new_mp;
1839 uint64_t mounted_on_fileno;
1840
1841 if (nd->nd_repstat) {
1842 nfsrv_postopattr(nd, getret, &at);
1843 goto out;
1844 }
1845 NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1846 off = fxdr_hyper(tl);
1847 toff = off;
1848 tl += 2;
1849 verf = fxdr_hyper(tl);
1850 tl += 2;
1851 siz = fxdr_unsigned(int, *tl++);
1852 cnt = fxdr_unsigned(int, *tl);
1853
1854 /*
1855 * Use the server's maximum data transfer size as the upper bound
1856 * on reply datalen.
1857 */
1858 if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1859 cnt = NFS_SRVMAXDATA(nd);
1860
1861 /*
1862 * siz is a "hint" of how much directory information (name, fileid,
1863 * cookie) should be in the reply. At least one client "hints" 0,
1864 * so I set it to cnt for that case. I also round it up to the
1865 * next multiple of DIRBLKSIZ.
1866 */
1867 if (siz <= 0)
1868 siz = cnt;
1869 siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1870
1871 if (nd->nd_flag & ND_NFSV4) {
1872 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1873 if (error)
1874 goto nfsmout;
1875 NFSSET_ATTRBIT(&savbits, &attrbits);
1876 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1877 NFSZERO_ATTRBIT(&rderrbits);
1878 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1879 } else {
1880 NFSZERO_ATTRBIT(&attrbits);
1881 }
1882 fullsiz = siz;
1883 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1884 if (!nd->nd_repstat) {
1885 if (off && verf != at.na_filerev) {
1886 /*
1887 * va_filerev is not sufficient as a cookie verifier,
1888 * since it is not supposed to change when entries are
1889 * removed/added unless that offset cookies returned to
1890 * the client are no longer valid.
1891 */
1892 #if 0
1893 if (nd->nd_flag & ND_NFSV4) {
1894 nd->nd_repstat = NFSERR_NOTSAME;
1895 } else {
1896 nd->nd_repstat = NFSERR_BAD_COOKIE;
1897 }
1898 #endif
1899 } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1900 nd->nd_repstat = NFSERR_BAD_COOKIE;
1901 }
1902 }
1903 if (!nd->nd_repstat && vp->v_type != VDIR)
1904 nd->nd_repstat = NFSERR_NOTDIR;
1905 if (!nd->nd_repstat && cnt == 0)
1906 nd->nd_repstat = NFSERR_TOOSMALL;
1907 if (!nd->nd_repstat)
1908 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1909 nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1910 NFSACCCHK_VPISLOCKED, NULL);
1911 if (nd->nd_repstat) {
1912 vput(vp);
1913 if (nd->nd_flag & ND_NFSV3)
1914 nfsrv_postopattr(nd, getret, &at);
1915 goto out;
1916 }
1917 is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1918 is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
1919
1920 MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1921 again:
1922 eofflag = 0;
1923 if (cookies) {
1924 free((caddr_t)cookies, M_TEMP);
1925 cookies = NULL;
1926 }
1927
1928 iv.iov_base = rbuf;
1929 iv.iov_len = siz;
1930 io.uio_iov = &iv;
1931 io.uio_iovcnt = 1;
1932 io.uio_offset = (off_t)off;
1933 io.uio_resid = siz;
1934 io.uio_segflg = UIO_SYSSPACE;
1935 io.uio_rw = UIO_READ;
1936 io.uio_td = NULL;
1937 nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1938 &cookies);
1939 off = (u_int64_t)io.uio_offset;
1940 if (io.uio_resid)
1941 siz -= io.uio_resid;
1942
1943 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1944
1945 if (!cookies && !nd->nd_repstat)
1946 nd->nd_repstat = NFSERR_PERM;
1947 if (!nd->nd_repstat)
1948 nd->nd_repstat = getret;
1949 if (nd->nd_repstat) {
1950 vput(vp);
1951 if (cookies)
1952 free((caddr_t)cookies, M_TEMP);
1953 free((caddr_t)rbuf, M_TEMP);
1954 if (nd->nd_flag & ND_NFSV3)
1955 nfsrv_postopattr(nd, getret, &at);
1956 goto out;
1957 }
1958 /*
1959 * If nothing read, return eof
1960 * rpc reply
1961 */
1962 if (siz == 0) {
1963 vput(vp);
1964 if (nd->nd_flag & ND_NFSV3)
1965 nfsrv_postopattr(nd, getret, &at);
1966 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1967 txdr_hyper(at.na_filerev, tl);
1968 tl += 2;
1969 *tl++ = newnfs_false;
1970 *tl = newnfs_true;
1971 free((caddr_t)cookies, M_TEMP);
1972 free((caddr_t)rbuf, M_TEMP);
1973 goto out;
1974 }
1975
1976 /*
1977 * Check for degenerate cases of nothing useful read.
1978 * If so go try again
1979 */
1980 cpos = rbuf;
1981 cend = rbuf + siz;
1982 dp = (struct dirent *)cpos;
1983 cookiep = cookies;
1984
1985 /*
1986 * For some reason FreeBSD's ufs_readdir() chooses to back the
1987 * directory offset up to a block boundary, so it is necessary to
1988 * skip over the records that precede the requested offset. This
1989 * requires the assumption that file offset cookies monotonically
1990 * increase.
1991 */
1992 while (cpos < cend && ncookies > 0 &&
1993 (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1994 (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
1995 ((nd->nd_flag & ND_NFSV4) &&
1996 ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1997 (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1998 cpos += dp->d_reclen;
1999 dp = (struct dirent *)cpos;
2000 cookiep++;
2001 ncookies--;
2002 }
2003 if (cpos >= cend || ncookies == 0) {
2004 siz = fullsiz;
2005 toff = off;
2006 goto again;
2007 }
2008
2009 /*
2010 * Busy the file system so that the mount point won't go away
2011 * and, as such, VFS_VGET() can be used safely.
2012 */
2013 mp = vp->v_mount;
2014 vfs_ref(mp);
2015 NFSVOPUNLOCK(vp, 0);
2016 nd->nd_repstat = vfs_busy(mp, 0);
2017 vfs_rel(mp);
2018 if (nd->nd_repstat != 0) {
2019 vrele(vp);
2020 free(cookies, M_TEMP);
2021 free(rbuf, M_TEMP);
2022 if (nd->nd_flag & ND_NFSV3)
2023 nfsrv_postopattr(nd, getret, &at);
2024 goto out;
2025 }
2026
2027 /*
2028 * Check to see if entries in this directory can be safely acquired
2029 * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
2030 * ZFS snapshot directories need VOP_LOOKUP(), so that any
2031 * automount of the snapshot directory that is required will
2032 * be done.
2033 * This needs to be done here for NFSv4, since NFSv4 never does
2034 * a VFS_VGET() for "." or "..".
2035 */
2036 if (is_zfs == 1) {
2037 r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
2038 if (r == EOPNOTSUPP) {
2039 usevget = 0;
2040 cn.cn_nameiop = LOOKUP;
2041 cn.cn_lkflags = LK_SHARED | LK_RETRY;
2042 cn.cn_cred = nd->nd_cred;
2043 cn.cn_thread = p;
2044 } else if (r == 0)
2045 vput(nvp);
2046 }
2047
2048 /*
2049 * Save this position, in case there is an error before one entry
2050 * is created.
2051 */
2052 mb0 = nd->nd_mb;
2053 bpos0 = nd->nd_bpos;
2054
2055 /*
2056 * Fill in the first part of the reply.
2057 * dirlen is the reply length in bytes and cannot exceed cnt.
2058 * (Include the two booleans at the end of the reply in dirlen now,
2059 * so we recognize when we have exceeded cnt.)
2060 */
2061 if (nd->nd_flag & ND_NFSV3) {
2062 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2063 nfsrv_postopattr(nd, getret, &at);
2064 } else {
2065 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2066 }
2067 NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2068 txdr_hyper(at.na_filerev, tl);
2069
2070 /*
2071 * Save this position, in case there is an empty reply needed.
2072 */
2073 mb1 = nd->nd_mb;
2074 bpos1 = nd->nd_bpos;
2075
2076 /* Loop through the records and build reply */
2077 entrycnt = 0;
2078 while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2079 nlen = dp->d_namlen;
2080 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2081 nlen <= NFS_MAXNAMLEN &&
2082 ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2083 (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2084 || (nlen == 1 && dp->d_name[0] != '.'))) {
2085 /*
2086 * Save the current position in the reply, in case
2087 * this entry exceeds cnt.
2088 */
2089 mb1 = nd->nd_mb;
2090 bpos1 = nd->nd_bpos;
2091
2092 /*
2093 * For readdir_and_lookup get the vnode using
2094 * the file number.
2095 */
2096 nvp = NULL;
2097 refp = NULL;
2098 r = 0;
2099 at_root = 0;
2100 needs_unbusy = 0;
2101 new_mp = mp;
2102 mounted_on_fileno = (uint64_t)dp->d_fileno;
2103 if ((nd->nd_flag & ND_NFSV3) ||
2104 NFSNONZERO_ATTRBIT(&savbits)) {
2105 if (nd->nd_flag & ND_NFSV4)
2106 refp = nfsv4root_getreferral(NULL,
2107 vp, dp->d_fileno);
2108 if (refp == NULL) {
2109 if (usevget)
2110 r = VFS_VGET(mp, dp->d_fileno,
2111 LK_SHARED, &nvp);
2112 else
2113 r = EOPNOTSUPP;
2114 if (r == EOPNOTSUPP) {
2115 if (usevget) {
2116 usevget = 0;
2117 cn.cn_nameiop = LOOKUP;
2118 cn.cn_lkflags =
2119 LK_SHARED |
2120 LK_RETRY;
2121 cn.cn_cred =
2122 nd->nd_cred;
2123 cn.cn_thread = p;
2124 }
2125 cn.cn_nameptr = dp->d_name;
2126 cn.cn_namelen = nlen;
2127 cn.cn_flags = ISLASTCN |
2128 NOFOLLOW | LOCKLEAF;
2129 if (nlen == 2 &&
2130 dp->d_name[0] == '.' &&
2131 dp->d_name[1] == '.')
2132 cn.cn_flags |=
2133 ISDOTDOT;
2134 if (NFSVOPLOCK(vp, LK_SHARED)
2135 != 0) {
2136 nd->nd_repstat = EPERM;
2137 break;
2138 }
2139 if ((vp->v_vflag & VV_ROOT) != 0
2140 && (cn.cn_flags & ISDOTDOT)
2141 != 0) {
2142 vref(vp);
2143 nvp = vp;
2144 r = 0;
2145 } else {
2146 r = VOP_LOOKUP(vp, &nvp,
2147 &cn);
2148 if (vp != nvp)
2149 NFSVOPUNLOCK(vp,
2150 0);
2151 }
2152 }
2153
2154 /*
2155 * For NFSv4, check to see if nvp is
2156 * a mount point and get the mount
2157 * point vnode, as required.
2158 */
2159 if (r == 0 &&
2160 nfsrv_enable_crossmntpt != 0 &&
2161 (nd->nd_flag & ND_NFSV4) != 0 &&
2162 nvp->v_type == VDIR &&
2163 nvp->v_mountedhere != NULL) {
2164 new_mp = nvp->v_mountedhere;
2165 r = vfs_busy(new_mp, 0);
2166 vput(nvp);
2167 nvp = NULL;
2168 if (r == 0) {
2169 r = VFS_ROOT(new_mp,
2170 LK_SHARED, &nvp);
2171 needs_unbusy = 1;
2172 if (r == 0)
2173 at_root = 1;
2174 }
2175 }
2176 }
2177 if (!r) {
2178 if (refp == NULL &&
2179 ((nd->nd_flag & ND_NFSV3) ||
2180 NFSNONZERO_ATTRBIT(&attrbits))) {
2181 r = nfsvno_getfh(nvp, &nfh, p);
2182 if (!r)
2183 r = nfsvno_getattr(nvp, nvap,
2184 nd->nd_cred, p, 1);
2185 if (r == 0 && is_zfs == 1 &&
2186 nfsrv_enable_crossmntpt != 0 &&
2187 (nd->nd_flag & ND_NFSV4) != 0 &&
2188 nvp->v_type == VDIR &&
2189 vp->v_mount != nvp->v_mount) {
2190 /*
2191 * For a ZFS snapshot, there is a
2192 * pseudo mount that does not set
2193 * v_mountedhere, so it needs to
2194 * be detected via a different
2195 * mount structure.
2196 */
2197 at_root = 1;
2198 if (new_mp == mp)
2199 new_mp = nvp->v_mount;
2200 }
2201 }
2202 } else {
2203 nvp = NULL;
2204 }
2205 if (r) {
2206 if (!NFSISSET_ATTRBIT(&attrbits,
2207 NFSATTRBIT_RDATTRERROR)) {
2208 if (nvp != NULL)
2209 vput(nvp);
2210 if (needs_unbusy != 0)
2211 vfs_unbusy(new_mp);
2212 nd->nd_repstat = r;
2213 break;
2214 }
2215 }
2216 }
2217
2218 /*
2219 * Build the directory record xdr
2220 */
2221 if (nd->nd_flag & ND_NFSV3) {
2222 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2223 *tl++ = newnfs_true;
2224 *tl++ = 0;
2225 *tl = txdr_unsigned(dp->d_fileno);
2226 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2227 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2228 *tl++ = 0;
2229 *tl = txdr_unsigned(*cookiep);
2230 nfsrv_postopattr(nd, 0, nvap);
2231 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2232 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2233 if (nvp != NULL)
2234 vput(nvp);
2235 } else {
2236 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2237 *tl++ = newnfs_true;
2238 *tl++ = 0;
2239 *tl = txdr_unsigned(*cookiep);
2240 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2241 if (nvp != NULL) {
2242 supports_nfsv4acls =
2243 nfs_supportsnfsv4acls(nvp);
2244 NFSVOPUNLOCK(nvp, 0);
2245 } else
2246 supports_nfsv4acls = 0;
2247 if (refp != NULL) {
2248 dirlen += nfsrv_putreferralattr(nd,
2249 &savbits, refp, 0,
2250 &nd->nd_repstat);
2251 if (nd->nd_repstat) {
2252 if (nvp != NULL)
2253 vrele(nvp);
2254 if (needs_unbusy != 0)
2255 vfs_unbusy(new_mp);
2256 break;
2257 }
2258 } else if (r) {
2259 dirlen += nfsvno_fillattr(nd, new_mp,
2260 nvp, nvap, &nfh, r, &rderrbits,
2261 nd->nd_cred, p, isdgram, 0,
2262 supports_nfsv4acls, at_root,
2263 mounted_on_fileno);
2264 } else {
2265 dirlen += nfsvno_fillattr(nd, new_mp,
2266 nvp, nvap, &nfh, r, &attrbits,
2267 nd->nd_cred, p, isdgram, 0,
2268 supports_nfsv4acls, at_root,
2269 mounted_on_fileno);
2270 }
2271 if (nvp != NULL)
2272 vrele(nvp);
2273 dirlen += (3 * NFSX_UNSIGNED);
2274 }
2275 if (needs_unbusy != 0)
2276 vfs_unbusy(new_mp);
2277 if (dirlen <= cnt)
2278 entrycnt++;
2279 }
2280 cpos += dp->d_reclen;
2281 dp = (struct dirent *)cpos;
2282 cookiep++;
2283 ncookies--;
2284 }
2285 vrele(vp);
2286 vfs_unbusy(mp);
2287
2288 /*
2289 * If dirlen > cnt, we must strip off the last entry. If that
2290 * results in an empty reply, report NFSERR_TOOSMALL.
2291 */
2292 if (dirlen > cnt || nd->nd_repstat) {
2293 if (!nd->nd_repstat && entrycnt == 0)
2294 nd->nd_repstat = NFSERR_TOOSMALL;
2295 if (nd->nd_repstat) {
2296 newnfs_trimtrailing(nd, mb0, bpos0);
2297 if (nd->nd_flag & ND_NFSV3)
2298 nfsrv_postopattr(nd, getret, &at);
2299 } else
2300 newnfs_trimtrailing(nd, mb1, bpos1);
2301 eofflag = 0;
2302 } else if (cpos < cend)
2303 eofflag = 0;
2304 if (!nd->nd_repstat) {
2305 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2306 *tl++ = newnfs_false;
2307 if (eofflag)
2308 *tl = newnfs_true;
2309 else
2310 *tl = newnfs_false;
2311 }
2312 FREE((caddr_t)cookies, M_TEMP);
2313 FREE((caddr_t)rbuf, M_TEMP);
2314
2315 out:
2316 NFSEXITCODE2(0, nd);
2317 return (0);
2318 nfsmout:
2319 vput(vp);
2320 NFSEXITCODE2(error, nd);
2321 return (error);
2322 }
2323
2324 /*
2325 * Get the settable attributes out of the mbuf list.
2326 * (Return 0 or EBADRPC)
2327 */
2328 int
nfsrv_sattr(struct nfsrv_descript * nd,vnode_t vp,struct nfsvattr * nvap,nfsattrbit_t * attrbitp,NFSACL_T * aclp,struct thread * p)2329 nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2330 nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2331 {
2332 u_int32_t *tl;
2333 struct nfsv2_sattr *sp;
2334 int error = 0, toclient = 0;
2335
2336 switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2337 case ND_NFSV2:
2338 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2339 /*
2340 * Some old clients didn't fill in the high order 16bits.
2341 * --> check the low order 2 bytes for 0xffff
2342 */
2343 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2344 nvap->na_mode = nfstov_mode(sp->sa_mode);
2345 if (sp->sa_uid != newnfs_xdrneg1)
2346 nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2347 if (sp->sa_gid != newnfs_xdrneg1)
2348 nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2349 if (sp->sa_size != newnfs_xdrneg1)
2350 nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2351 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2352 #ifdef notyet
2353 fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2354 #else
2355 nvap->na_atime.tv_sec =
2356 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2357 nvap->na_atime.tv_nsec = 0;
2358 #endif
2359 }
2360 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2361 fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2362 break;
2363 case ND_NFSV3:
2364 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2365 if (*tl == newnfs_true) {
2366 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2367 nvap->na_mode = nfstov_mode(*tl);
2368 }
2369 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2370 if (*tl == newnfs_true) {
2371 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2372 nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2373 }
2374 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2375 if (*tl == newnfs_true) {
2376 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2377 nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2378 }
2379 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2380 if (*tl == newnfs_true) {
2381 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2382 nvap->na_size = fxdr_hyper(tl);
2383 }
2384 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2385 switch (fxdr_unsigned(int, *tl)) {
2386 case NFSV3SATTRTIME_TOCLIENT:
2387 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2388 fxdr_nfsv3time(tl, &nvap->na_atime);
2389 toclient = 1;
2390 break;
2391 case NFSV3SATTRTIME_TOSERVER:
2392 vfs_timestamp(&nvap->na_atime);
2393 nvap->na_vaflags |= VA_UTIMES_NULL;
2394 break;
2395 }
2396 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2397 switch (fxdr_unsigned(int, *tl)) {
2398 case NFSV3SATTRTIME_TOCLIENT:
2399 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2400 fxdr_nfsv3time(tl, &nvap->na_mtime);
2401 nvap->na_vaflags &= ~VA_UTIMES_NULL;
2402 break;
2403 case NFSV3SATTRTIME_TOSERVER:
2404 vfs_timestamp(&nvap->na_mtime);
2405 if (!toclient)
2406 nvap->na_vaflags |= VA_UTIMES_NULL;
2407 break;
2408 }
2409 break;
2410 case ND_NFSV4:
2411 error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
2412 }
2413 nfsmout:
2414 NFSEXITCODE2(error, nd);
2415 return (error);
2416 }
2417
2418 /*
2419 * Handle the setable attributes for V4.
2420 * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2421 */
2422 int
nfsv4_sattr(struct nfsrv_descript * nd,vnode_t vp,struct nfsvattr * nvap,nfsattrbit_t * attrbitp,NFSACL_T * aclp,struct thread * p)2423 nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2424 nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2425 {
2426 u_int32_t *tl;
2427 int attrsum = 0;
2428 int i, j;
2429 int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2430 int toclient = 0;
2431 u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2432 uid_t uid;
2433 gid_t gid;
2434
2435 error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2436 if (error)
2437 goto nfsmout;
2438 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2439 attrsize = fxdr_unsigned(int, *tl);
2440
2441 /*
2442 * Loop around getting the setable attributes. If an unsupported
2443 * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2444 */
2445 if (retnotsup) {
2446 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2447 bitpos = NFSATTRBIT_MAX;
2448 } else {
2449 bitpos = 0;
2450 }
2451 for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2452 if (attrsum > attrsize) {
2453 error = NFSERR_BADXDR;
2454 goto nfsmout;
2455 }
2456 if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2457 switch (bitpos) {
2458 case NFSATTRBIT_SIZE:
2459 NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2460 if (vp != NULL && vp->v_type != VREG) {
2461 error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
2462 NFSERR_INVAL;
2463 goto nfsmout;
2464 }
2465 nvap->na_size = fxdr_hyper(tl);
2466 attrsum += NFSX_HYPER;
2467 break;
2468 case NFSATTRBIT_ACL:
2469 error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2470 p);
2471 if (error)
2472 goto nfsmout;
2473 if (aceerr && !nd->nd_repstat)
2474 nd->nd_repstat = aceerr;
2475 attrsum += aclsize;
2476 break;
2477 case NFSATTRBIT_ARCHIVE:
2478 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2479 if (!nd->nd_repstat)
2480 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2481 attrsum += NFSX_UNSIGNED;
2482 break;
2483 case NFSATTRBIT_HIDDEN:
2484 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2485 if (!nd->nd_repstat)
2486 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2487 attrsum += NFSX_UNSIGNED;
2488 break;
2489 case NFSATTRBIT_MIMETYPE:
2490 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2491 i = fxdr_unsigned(int, *tl);
2492 error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2493 if (error)
2494 goto nfsmout;
2495 if (!nd->nd_repstat)
2496 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2497 attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2498 break;
2499 case NFSATTRBIT_MODE:
2500 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2501 nvap->na_mode = nfstov_mode(*tl);
2502 attrsum += NFSX_UNSIGNED;
2503 break;
2504 case NFSATTRBIT_OWNER:
2505 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2506 j = fxdr_unsigned(int, *tl);
2507 if (j < 0) {
2508 error = NFSERR_BADXDR;
2509 goto nfsmout;
2510 }
2511 if (j > NFSV4_SMALLSTR)
2512 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2513 else
2514 cp = namestr;
2515 error = nfsrv_mtostr(nd, cp, j);
2516 if (error) {
2517 if (j > NFSV4_SMALLSTR)
2518 free(cp, M_NFSSTRING);
2519 goto nfsmout;
2520 }
2521 if (!nd->nd_repstat) {
2522 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
2523 p);
2524 if (!nd->nd_repstat)
2525 nvap->na_uid = uid;
2526 }
2527 if (j > NFSV4_SMALLSTR)
2528 free(cp, M_NFSSTRING);
2529 attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2530 break;
2531 case NFSATTRBIT_OWNERGROUP:
2532 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2533 j = fxdr_unsigned(int, *tl);
2534 if (j < 0) {
2535 error = NFSERR_BADXDR;
2536 goto nfsmout;
2537 }
2538 if (j > NFSV4_SMALLSTR)
2539 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2540 else
2541 cp = namestr;
2542 error = nfsrv_mtostr(nd, cp, j);
2543 if (error) {
2544 if (j > NFSV4_SMALLSTR)
2545 free(cp, M_NFSSTRING);
2546 goto nfsmout;
2547 }
2548 if (!nd->nd_repstat) {
2549 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
2550 p);
2551 if (!nd->nd_repstat)
2552 nvap->na_gid = gid;
2553 }
2554 if (j > NFSV4_SMALLSTR)
2555 free(cp, M_NFSSTRING);
2556 attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2557 break;
2558 case NFSATTRBIT_SYSTEM:
2559 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2560 if (!nd->nd_repstat)
2561 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2562 attrsum += NFSX_UNSIGNED;
2563 break;
2564 case NFSATTRBIT_TIMEACCESSSET:
2565 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2566 attrsum += NFSX_UNSIGNED;
2567 if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2568 NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2569 fxdr_nfsv4time(tl, &nvap->na_atime);
2570 toclient = 1;
2571 attrsum += NFSX_V4TIME;
2572 } else {
2573 vfs_timestamp(&nvap->na_atime);
2574 nvap->na_vaflags |= VA_UTIMES_NULL;
2575 }
2576 break;
2577 case NFSATTRBIT_TIMEBACKUP:
2578 NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2579 if (!nd->nd_repstat)
2580 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2581 attrsum += NFSX_V4TIME;
2582 break;
2583 case NFSATTRBIT_TIMECREATE:
2584 NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2585 if (!nd->nd_repstat)
2586 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2587 attrsum += NFSX_V4TIME;
2588 break;
2589 case NFSATTRBIT_TIMEMODIFYSET:
2590 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2591 attrsum += NFSX_UNSIGNED;
2592 if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2593 NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2594 fxdr_nfsv4time(tl, &nvap->na_mtime);
2595 nvap->na_vaflags &= ~VA_UTIMES_NULL;
2596 attrsum += NFSX_V4TIME;
2597 } else {
2598 vfs_timestamp(&nvap->na_mtime);
2599 if (!toclient)
2600 nvap->na_vaflags |= VA_UTIMES_NULL;
2601 }
2602 break;
2603 default:
2604 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2605 /*
2606 * set bitpos so we drop out of the loop.
2607 */
2608 bitpos = NFSATTRBIT_MAX;
2609 break;
2610 }
2611 }
2612
2613 /*
2614 * some clients pad the attrlist, so we need to skip over the
2615 * padding.
2616 */
2617 if (attrsum > attrsize) {
2618 error = NFSERR_BADXDR;
2619 } else {
2620 attrsize = NFSM_RNDUP(attrsize);
2621 if (attrsum < attrsize)
2622 error = nfsm_advance(nd, attrsize - attrsum, -1);
2623 }
2624 nfsmout:
2625 NFSEXITCODE2(error, nd);
2626 return (error);
2627 }
2628
2629 /*
2630 * Check/setup export credentials.
2631 */
2632 int
nfsd_excred(struct nfsrv_descript * nd,struct nfsexstuff * exp,struct ucred * credanon)2633 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2634 struct ucred *credanon)
2635 {
2636 int error = 0;
2637
2638 /*
2639 * Check/setup credentials.
2640 */
2641 if (nd->nd_flag & ND_GSS)
2642 exp->nes_exflag &= ~MNT_EXPORTANON;
2643
2644 /*
2645 * Check to see if the operation is allowed for this security flavor.
2646 * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2647 * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2648 * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2649 */
2650 if (nfsvno_testexp(nd, exp) &&
2651 nd->nd_procnum != NFSV4OP_SECINFO &&
2652 nd->nd_procnum != NFSPROC_FSINFO) {
2653 if (nd->nd_flag & ND_NFSV4)
2654 error = NFSERR_WRONGSEC;
2655 else
2656 error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2657 goto out;
2658 }
2659
2660 /*
2661 * Check to see if the file system is exported V4 only.
2662 */
2663 if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2664 error = NFSERR_PROGNOTV4;
2665 goto out;
2666 }
2667
2668 /*
2669 * Now, map the user credentials.
2670 * (Note that ND_AUTHNONE will only be set for an NFSv3
2671 * Fsinfo RPC. If set for anything else, this code might need
2672 * to change.)
2673 */
2674 if (NFSVNO_EXPORTED(exp)) {
2675 if (((nd->nd_flag & ND_GSS) == 0 && nd->nd_cred->cr_uid == 0) ||
2676 NFSVNO_EXPORTANON(exp) ||
2677 (nd->nd_flag & ND_AUTHNONE) != 0) {
2678 nd->nd_cred->cr_uid = credanon->cr_uid;
2679 nd->nd_cred->cr_gid = credanon->cr_gid;
2680 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2681 credanon->cr_groups);
2682 } else if ((nd->nd_flag & ND_GSS) == 0) {
2683 /*
2684 * If using AUTH_SYS, call nfsrv_getgrpscred() to see
2685 * if there is a replacement credential with a group
2686 * list set up by "nfsuserd -manage-gids".
2687 * If there is no replacement, nfsrv_getgrpscred()
2688 * simply returns its argument.
2689 */
2690 nd->nd_cred = nfsrv_getgrpscred(nd->nd_cred);
2691 }
2692 }
2693
2694 out:
2695 NFSEXITCODE2(error, nd);
2696 return (error);
2697 }
2698
2699 /*
2700 * Check exports.
2701 */
2702 int
nfsvno_checkexp(struct mount * mp,struct sockaddr * nam,struct nfsexstuff * exp,struct ucred ** credp)2703 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2704 struct ucred **credp)
2705 {
2706 int i, error, *secflavors;
2707
2708 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2709 &exp->nes_numsecflavor, &secflavors);
2710 if (error) {
2711 if (nfs_rootfhset) {
2712 exp->nes_exflag = 0;
2713 exp->nes_numsecflavor = 0;
2714 error = 0;
2715 }
2716 } else {
2717 /* Copy the security flavors. */
2718 for (i = 0; i < exp->nes_numsecflavor; i++)
2719 exp->nes_secflavors[i] = secflavors[i];
2720 }
2721 NFSEXITCODE(error);
2722 return (error);
2723 }
2724
2725 /*
2726 * Get a vnode for a file handle and export stuff.
2727 */
2728 int
nfsvno_fhtovp(struct mount * mp,fhandle_t * fhp,struct sockaddr * nam,int lktype,struct vnode ** vpp,struct nfsexstuff * exp,struct ucred ** credp)2729 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2730 int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2731 struct ucred **credp)
2732 {
2733 int i, error, *secflavors;
2734
2735 *credp = NULL;
2736 exp->nes_numsecflavor = 0;
2737 error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
2738 if (error != 0)
2739 /* Make sure the server replies ESTALE to the client. */
2740 error = ESTALE;
2741 if (nam && !error) {
2742 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2743 &exp->nes_numsecflavor, &secflavors);
2744 if (error) {
2745 if (nfs_rootfhset) {
2746 exp->nes_exflag = 0;
2747 exp->nes_numsecflavor = 0;
2748 error = 0;
2749 } else {
2750 vput(*vpp);
2751 }
2752 } else {
2753 /* Copy the security flavors. */
2754 for (i = 0; i < exp->nes_numsecflavor; i++)
2755 exp->nes_secflavors[i] = secflavors[i];
2756 }
2757 }
2758 NFSEXITCODE(error);
2759 return (error);
2760 }
2761
2762 /*
2763 * nfsd_fhtovp() - convert a fh to a vnode ptr
2764 * - look up fsid in mount list (if not found ret error)
2765 * - get vp and export rights by calling nfsvno_fhtovp()
2766 * - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2767 * for AUTH_SYS
2768 * - if mpp != NULL, return the mount point so that it can
2769 * be used for vn_finished_write() by the caller
2770 */
2771 void
nfsd_fhtovp(struct nfsrv_descript * nd,struct nfsrvfh * nfp,int lktype,struct vnode ** vpp,struct nfsexstuff * exp,struct mount ** mpp,int startwrite,struct thread * p)2772 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2773 struct vnode **vpp, struct nfsexstuff *exp,
2774 struct mount **mpp, int startwrite, struct thread *p)
2775 {
2776 struct mount *mp;
2777 struct ucred *credanon;
2778 fhandle_t *fhp;
2779
2780 fhp = (fhandle_t *)nfp->nfsrvfh_data;
2781 /*
2782 * Check for the special case of the nfsv4root_fh.
2783 */
2784 mp = vfs_busyfs(&fhp->fh_fsid);
2785 if (mpp != NULL)
2786 *mpp = mp;
2787 if (mp == NULL) {
2788 *vpp = NULL;
2789 nd->nd_repstat = ESTALE;
2790 goto out;
2791 }
2792
2793 if (startwrite) {
2794 vn_start_write(NULL, mpp, V_WAIT);
2795 if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
2796 lktype = LK_EXCLUSIVE;
2797 }
2798 nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2799 &credanon);
2800 vfs_unbusy(mp);
2801
2802 /*
2803 * For NFSv4 without a pseudo root fs, unexported file handles
2804 * can be returned, so that Lookup works everywhere.
2805 */
2806 if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2807 !(nd->nd_flag & ND_NFSV4)) {
2808 vput(*vpp);
2809 nd->nd_repstat = EACCES;
2810 }
2811
2812 /*
2813 * Personally, I've never seen any point in requiring a
2814 * reserved port#, since only in the rare case where the
2815 * clients are all boxes with secure system privileges,
2816 * does it provide any enhanced security, but... some people
2817 * believe it to be useful and keep putting this code back in.
2818 * (There is also some "security checker" out there that
2819 * complains if the nfs server doesn't enforce this.)
2820 * However, note the following:
2821 * RFC3530 (NFSv4) specifies that a reserved port# not be
2822 * required.
2823 * RFC2623 recommends that, if a reserved port# is checked for,
2824 * that there be a way to turn that off--> ifdef'd.
2825 */
2826 #ifdef NFS_REQRSVPORT
2827 if (!nd->nd_repstat) {
2828 struct sockaddr_in *saddr;
2829 struct sockaddr_in6 *saddr6;
2830
2831 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2832 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2833 if (!(nd->nd_flag & ND_NFSV4) &&
2834 ((saddr->sin_family == AF_INET &&
2835 ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2836 (saddr6->sin6_family == AF_INET6 &&
2837 ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2838 vput(*vpp);
2839 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2840 }
2841 }
2842 #endif /* NFS_REQRSVPORT */
2843
2844 /*
2845 * Check/setup credentials.
2846 */
2847 if (!nd->nd_repstat) {
2848 nd->nd_saveduid = nd->nd_cred->cr_uid;
2849 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2850 if (nd->nd_repstat)
2851 vput(*vpp);
2852 }
2853 if (credanon != NULL)
2854 crfree(credanon);
2855 if (nd->nd_repstat) {
2856 if (startwrite)
2857 vn_finished_write(mp);
2858 *vpp = NULL;
2859 if (mpp != NULL)
2860 *mpp = NULL;
2861 }
2862
2863 out:
2864 NFSEXITCODE2(0, nd);
2865 }
2866
2867 /*
2868 * glue for fp.
2869 */
2870 static int
fp_getfvp(struct thread * p,int fd,struct file ** fpp,struct vnode ** vpp)2871 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2872 {
2873 struct filedesc *fdp;
2874 struct file *fp;
2875 int error = 0;
2876
2877 fdp = p->td_proc->p_fd;
2878 if (fd < 0 || fd >= fdp->fd_nfiles ||
2879 (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
2880 error = EBADF;
2881 goto out;
2882 }
2883 *fpp = fp;
2884
2885 out:
2886 NFSEXITCODE(error);
2887 return (error);
2888 }
2889
2890 /*
2891 * Called from nfssvc() to update the exports list. Just call
2892 * vfs_export(). This has to be done, since the v4 root fake fs isn't
2893 * in the mount list.
2894 */
2895 int
nfsrv_v4rootexport(void * argp,struct ucred * cred,struct thread * p)2896 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2897 {
2898 struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2899 int error = 0;
2900 struct nameidata nd;
2901 fhandle_t fh;
2902
2903 error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2904 if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2905 nfs_rootfhset = 0;
2906 else if (error == 0) {
2907 if (nfsexargp->fspec == NULL) {
2908 error = EPERM;
2909 goto out;
2910 }
2911 /*
2912 * If fspec != NULL, this is the v4root path.
2913 */
2914 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
2915 nfsexargp->fspec, p);
2916 if ((error = namei(&nd)) != 0)
2917 goto out;
2918 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2919 vrele(nd.ni_vp);
2920 if (!error) {
2921 nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2922 NFSBCOPY((caddr_t)&fh,
2923 nfs_rootfh.nfsrvfh_data,
2924 sizeof (fhandle_t));
2925 nfs_rootfhset = 1;
2926 }
2927 }
2928
2929 out:
2930 NFSEXITCODE(error);
2931 return (error);
2932 }
2933
2934 /*
2935 * This function needs to test to see if the system is near its limit
2936 * for memory allocation via malloc() or mget() and return True iff
2937 * either of these resources are near their limit.
2938 * XXX (For now, this is just a stub.)
2939 */
2940 int nfsrv_testmalloclimit = 0;
2941 int
nfsrv_mallocmget_limit(void)2942 nfsrv_mallocmget_limit(void)
2943 {
2944 static int printmesg = 0;
2945 static int testval = 1;
2946
2947 if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2948 if ((printmesg++ % 100) == 0)
2949 printf("nfsd: malloc/mget near limit\n");
2950 return (1);
2951 }
2952 return (0);
2953 }
2954
2955 /*
2956 * BSD specific initialization of a mount point.
2957 */
2958 void
nfsd_mntinit(void)2959 nfsd_mntinit(void)
2960 {
2961 static int inited = 0;
2962
2963 if (inited)
2964 return;
2965 inited = 1;
2966 nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2967 TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2968 TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2969 nfsv4root_mnt.mnt_export = NULL;
2970 TAILQ_INIT(&nfsv4root_opt);
2971 TAILQ_INIT(&nfsv4root_newopt);
2972 nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2973 nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2974 nfsv4root_mnt.mnt_nvnodelistsize = 0;
2975 nfsv4root_mnt.mnt_activevnodelistsize = 0;
2976 }
2977
2978 /*
2979 * Get a vnode for a file handle, without checking exports, etc.
2980 */
2981 struct vnode *
nfsvno_getvp(fhandle_t * fhp)2982 nfsvno_getvp(fhandle_t *fhp)
2983 {
2984 struct mount *mp;
2985 struct vnode *vp;
2986 int error;
2987
2988 mp = vfs_busyfs(&fhp->fh_fsid);
2989 if (mp == NULL)
2990 return (NULL);
2991 error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2992 vfs_unbusy(mp);
2993 if (error)
2994 return (NULL);
2995 return (vp);
2996 }
2997
2998 /*
2999 * Do a local VOP_ADVLOCK().
3000 */
3001 int
nfsvno_advlock(struct vnode * vp,int ftype,u_int64_t first,u_int64_t end,struct thread * td)3002 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
3003 u_int64_t end, struct thread *td)
3004 {
3005 int error = 0;
3006 struct flock fl;
3007 u_int64_t tlen;
3008
3009 if (nfsrv_dolocallocks == 0)
3010 goto out;
3011 ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");
3012
3013 fl.l_whence = SEEK_SET;
3014 fl.l_type = ftype;
3015 fl.l_start = (off_t)first;
3016 if (end == NFS64BITSSET) {
3017 fl.l_len = 0;
3018 } else {
3019 tlen = end - first;
3020 fl.l_len = (off_t)tlen;
3021 }
3022 /*
3023 * For FreeBSD8, the l_pid and l_sysid must be set to the same
3024 * values for all calls, so that all locks will be held by the
3025 * nfsd server. (The nfsd server handles conflicts between the
3026 * various clients.)
3027 * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
3028 * bytes, so it can't be put in l_sysid.
3029 */
3030 if (nfsv4_sysid == 0)
3031 nfsv4_sysid = nlm_acquire_next_sysid();
3032 fl.l_pid = (pid_t)0;
3033 fl.l_sysid = (int)nfsv4_sysid;
3034
3035 if (ftype == F_UNLCK)
3036 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
3037 (F_POSIX | F_REMOTE));
3038 else
3039 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3040 (F_POSIX | F_REMOTE));
3041
3042 out:
3043 NFSEXITCODE(error);
3044 return (error);
3045 }
3046
3047 /*
3048 * Check the nfsv4 root exports.
3049 */
3050 int
nfsvno_v4rootexport(struct nfsrv_descript * nd)3051 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3052 {
3053 struct ucred *credanon;
3054 int exflags, error = 0, numsecflavor, *secflavors, i;
3055
3056 error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3057 &credanon, &numsecflavor, &secflavors);
3058 if (error) {
3059 error = NFSERR_PROGUNAVAIL;
3060 goto out;
3061 }
3062 if (credanon != NULL)
3063 crfree(credanon);
3064 for (i = 0; i < numsecflavor; i++) {
3065 if (secflavors[i] == AUTH_SYS)
3066 nd->nd_flag |= ND_EXAUTHSYS;
3067 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3068 nd->nd_flag |= ND_EXGSS;
3069 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3070 nd->nd_flag |= ND_EXGSSINTEGRITY;
3071 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3072 nd->nd_flag |= ND_EXGSSPRIVACY;
3073 }
3074
3075 out:
3076 NFSEXITCODE(error);
3077 return (error);
3078 }
3079
3080 /*
3081 * Nfs server pseudo system call for the nfsd's
3082 */
3083 /*
3084 * MPSAFE
3085 */
3086 static int
nfssvc_nfsd(struct thread * td,struct nfssvc_args * uap)3087 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3088 {
3089 struct file *fp;
3090 struct nfsd_addsock_args sockarg;
3091 struct nfsd_nfsd_args nfsdarg;
3092 cap_rights_t rights;
3093 int error;
3094
3095 if (uap->flag & NFSSVC_NFSDADDSOCK) {
3096 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3097 if (error)
3098 goto out;
3099 /*
3100 * Since we don't know what rights might be required,
3101 * pretend that we need them all. It is better to be too
3102 * careful than too reckless.
3103 */
3104 error = fget(td, sockarg.sock,
3105 cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
3106 if (error != 0)
3107 goto out;
3108 if (fp->f_type != DTYPE_SOCKET) {
3109 fdrop(fp, td);
3110 error = EPERM;
3111 goto out;
3112 }
3113 error = nfsrvd_addsock(fp);
3114 fdrop(fp, td);
3115 } else if (uap->flag & NFSSVC_NFSDNFSD) {
3116 if (uap->argp == NULL) {
3117 error = EINVAL;
3118 goto out;
3119 }
3120 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3121 sizeof (nfsdarg));
3122 if (error)
3123 goto out;
3124 error = nfsrvd_nfsd(td, &nfsdarg);
3125 } else {
3126 error = nfssvc_srvcall(td, uap, td->td_ucred);
3127 }
3128
3129 out:
3130 NFSEXITCODE(error);
3131 return (error);
3132 }
3133
3134 static int
nfssvc_srvcall(struct thread * p,struct nfssvc_args * uap,struct ucred * cred)3135 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3136 {
3137 struct nfsex_args export;
3138 struct file *fp = NULL;
3139 int stablefd, len;
3140 struct nfsd_clid adminrevoke;
3141 struct nfsd_dumplist dumplist;
3142 struct nfsd_dumpclients *dumpclients;
3143 struct nfsd_dumplocklist dumplocklist;
3144 struct nfsd_dumplocks *dumplocks;
3145 struct nameidata nd;
3146 vnode_t vp;
3147 int error = EINVAL, igotlock;
3148 struct proc *procp;
3149 static int suspend_nfsd = 0;
3150
3151 if (uap->flag & NFSSVC_PUBLICFH) {
3152 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3153 sizeof (fhandle_t));
3154 error = copyin(uap->argp,
3155 &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3156 if (!error)
3157 nfs_pubfhset = 1;
3158 } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3159 error = copyin(uap->argp,(caddr_t)&export,
3160 sizeof (struct nfsex_args));
3161 if (!error)
3162 error = nfsrv_v4rootexport(&export, cred, p);
3163 } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3164 nfs_pubfhset = 0;
3165 error = 0;
3166 } else if (uap->flag & NFSSVC_STABLERESTART) {
3167 error = copyin(uap->argp, (caddr_t)&stablefd,
3168 sizeof (int));
3169 if (!error)
3170 error = fp_getfvp(p, stablefd, &fp, &vp);
3171 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3172 error = EBADF;
3173 if (!error && newnfs_numnfsd != 0)
3174 error = EPERM;
3175 if (!error) {
3176 nfsrv_stablefirst.nsf_fp = fp;
3177 nfsrv_setupstable(p);
3178 }
3179 } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3180 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3181 sizeof (struct nfsd_clid));
3182 if (!error)
3183 error = nfsrv_adminrevoke(&adminrevoke, p);
3184 } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3185 error = copyin(uap->argp, (caddr_t)&dumplist,
3186 sizeof (struct nfsd_dumplist));
3187 if (!error && (dumplist.ndl_size < 1 ||
3188 dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3189 error = EPERM;
3190 if (!error) {
3191 len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3192 dumpclients = (struct nfsd_dumpclients *)malloc(len,
3193 M_TEMP, M_WAITOK);
3194 nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3195 error = copyout(dumpclients,
3196 CAST_USER_ADDR_T(dumplist.ndl_list), len);
3197 free((caddr_t)dumpclients, M_TEMP);
3198 }
3199 } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3200 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3201 sizeof (struct nfsd_dumplocklist));
3202 if (!error && (dumplocklist.ndllck_size < 1 ||
3203 dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3204 error = EPERM;
3205 if (!error)
3206 error = nfsrv_lookupfilename(&nd,
3207 dumplocklist.ndllck_fname, p);
3208 if (!error) {
3209 len = sizeof (struct nfsd_dumplocks) *
3210 dumplocklist.ndllck_size;
3211 dumplocks = (struct nfsd_dumplocks *)malloc(len,
3212 M_TEMP, M_WAITOK);
3213 nfsrv_dumplocks(nd.ni_vp, dumplocks,
3214 dumplocklist.ndllck_size, p);
3215 vput(nd.ni_vp);
3216 error = copyout(dumplocks,
3217 CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3218 free((caddr_t)dumplocks, M_TEMP);
3219 }
3220 } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3221 procp = p->td_proc;
3222 PROC_LOCK(procp);
3223 nfsd_master_pid = procp->p_pid;
3224 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3225 nfsd_master_start = procp->p_stats->p_start;
3226 nfsd_master_proc = procp;
3227 PROC_UNLOCK(procp);
3228 } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
3229 NFSLOCKV4ROOTMUTEX();
3230 if (suspend_nfsd == 0) {
3231 /* Lock out all nfsd threads */
3232 do {
3233 igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
3234 NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
3235 } while (igotlock == 0 && suspend_nfsd == 0);
3236 suspend_nfsd = 1;
3237 }
3238 NFSUNLOCKV4ROOTMUTEX();
3239 error = 0;
3240 } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
3241 NFSLOCKV4ROOTMUTEX();
3242 if (suspend_nfsd != 0) {
3243 nfsv4_unlock(&nfsd_suspend_lock, 0);
3244 suspend_nfsd = 0;
3245 }
3246 NFSUNLOCKV4ROOTMUTEX();
3247 error = 0;
3248 }
3249
3250 NFSEXITCODE(error);
3251 return (error);
3252 }
3253
3254 /*
3255 * Check exports.
3256 * Returns 0 if ok, 1 otherwise.
3257 */
3258 int
nfsvno_testexp(struct nfsrv_descript * nd,struct nfsexstuff * exp)3259 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3260 {
3261 int i;
3262
3263 /*
3264 * This seems odd, but allow the case where the security flavor
3265 * list is empty. This happens when NFSv4 is traversing non-exported
3266 * file systems. Exported file systems should always have a non-empty
3267 * security flavor list.
3268 */
3269 if (exp->nes_numsecflavor == 0)
3270 return (0);
3271
3272 for (i = 0; i < exp->nes_numsecflavor; i++) {
3273 /*
3274 * The tests for privacy and integrity must be first,
3275 * since ND_GSS is set for everything but AUTH_SYS.
3276 */
3277 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3278 (nd->nd_flag & ND_GSSPRIVACY))
3279 return (0);
3280 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3281 (nd->nd_flag & ND_GSSINTEGRITY))
3282 return (0);
3283 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3284 (nd->nd_flag & ND_GSS))
3285 return (0);
3286 if (exp->nes_secflavors[i] == AUTH_SYS &&
3287 (nd->nd_flag & ND_GSS) == 0)
3288 return (0);
3289 }
3290 return (1);
3291 }
3292
3293 /*
3294 * Calculate a hash value for the fid in a file handle.
3295 */
3296 uint32_t
nfsrv_hashfh(fhandle_t * fhp)3297 nfsrv_hashfh(fhandle_t *fhp)
3298 {
3299 uint32_t hashval;
3300
3301 hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3302 return (hashval);
3303 }
3304
3305 /*
3306 * Calculate a hash value for the sessionid.
3307 */
3308 uint32_t
nfsrv_hashsessionid(uint8_t * sessionid)3309 nfsrv_hashsessionid(uint8_t *sessionid)
3310 {
3311 uint32_t hashval;
3312
3313 hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
3314 return (hashval);
3315 }
3316
3317 /*
3318 * Signal the userland master nfsd to backup the stable restart file.
3319 */
3320 void
nfsrv_backupstable(void)3321 nfsrv_backupstable(void)
3322 {
3323 struct proc *procp;
3324
3325 if (nfsd_master_proc != NULL) {
3326 procp = pfind(nfsd_master_pid);
3327 /* Try to make sure it is the correct process. */
3328 if (procp == nfsd_master_proc &&
3329 procp->p_stats->p_start.tv_sec ==
3330 nfsd_master_start.tv_sec &&
3331 procp->p_stats->p_start.tv_usec ==
3332 nfsd_master_start.tv_usec &&
3333 strcmp(procp->p_comm, nfsd_master_comm) == 0)
3334 kern_psignal(procp, SIGUSR2);
3335 else
3336 nfsd_master_proc = NULL;
3337
3338 if (procp != NULL)
3339 PROC_UNLOCK(procp);
3340 }
3341 }
3342
3343 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3344
3345 /*
3346 * Called once to initialize data structures...
3347 */
3348 static int
nfsd_modevent(module_t mod,int type,void * data)3349 nfsd_modevent(module_t mod, int type, void *data)
3350 {
3351 int error = 0, i;
3352 static int loaded = 0;
3353
3354 switch (type) {
3355 case MOD_LOAD:
3356 if (loaded)
3357 goto out;
3358 newnfs_portinit();
3359 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3360 mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
3361 MTX_DEF);
3362 mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
3363 MTX_DEF);
3364 }
3365 mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
3366 mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
3367 mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
3368 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3369 nfsrvd_initcache();
3370 nfsd_init();
3371 NFSD_LOCK();
3372 nfsrvd_init(0);
3373 NFSD_UNLOCK();
3374 nfsd_mntinit();
3375 #ifdef VV_DISABLEDELEG
3376 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3377 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3378 #endif
3379 nfsd_call_servertimer = nfsrv_servertimer;
3380 nfsd_call_nfsd = nfssvc_nfsd;
3381 loaded = 1;
3382 break;
3383
3384 case MOD_UNLOAD:
3385 if (newnfs_numnfsd != 0) {
3386 error = EBUSY;
3387 break;
3388 }
3389
3390 #ifdef VV_DISABLEDELEG
3391 vn_deleg_ops.vndeleg_recall = NULL;
3392 vn_deleg_ops.vndeleg_disable = NULL;
3393 #endif
3394 nfsd_call_servertimer = NULL;
3395 nfsd_call_nfsd = NULL;
3396
3397 /* Clean out all NFSv4 state. */
3398 nfsrv_throwawayallstate(curthread);
3399
3400 /* Clean the NFS server reply cache */
3401 nfsrvd_cleancache();
3402
3403 /* Free up the krpc server pool. */
3404 if (nfsrvd_pool != NULL)
3405 svcpool_destroy(nfsrvd_pool);
3406
3407 /* and get rid of the locks */
3408 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3409 mtx_destroy(&nfsrchash_table[i].mtx);
3410 mtx_destroy(&nfsrcahash_table[i].mtx);
3411 }
3412 mtx_destroy(&nfsrc_udpmtx);
3413 mtx_destroy(&nfs_v4root_mutex);
3414 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3415 for (i = 0; i < nfsrv_sessionhashsize; i++)
3416 mtx_destroy(&nfssessionhash[i].mtx);
3417 lockdestroy(&nfsv4root_mnt.mnt_explock);
3418 free(nfsclienthash, M_NFSDCLIENT);
3419 free(nfslockhash, M_NFSDLOCKFILE);
3420 free(nfssessionhash, M_NFSDSESSION);
3421 loaded = 0;
3422 break;
3423 default:
3424 error = EOPNOTSUPP;
3425 break;
3426 }
3427
3428 out:
3429 NFSEXITCODE(error);
3430 return (error);
3431 }
3432 static moduledata_t nfsd_mod = {
3433 "nfsd",
3434 nfsd_modevent,
3435 NULL,
3436 };
3437 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3438
3439 /* So that loader and kldload(2) can find us, wherever we are.. */
3440 MODULE_VERSION(nfsd, 1);
3441 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3442 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3443 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3444 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3445 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3446
3447