1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
33 * $FreeBSD: /repoman/r/ncvs/src/sys/nfsclient/nfs_subs.c,v 1.128 2004/04/14 23:23:55 peadar Exp $
34 */
35
36 /*
37 * These functions support the macros and help fiddle mbuf chains for
38 * the nfs op functions. They do things like create the rpc header and
39 * copy data between mbuf chains and uio lists.
40 */
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/buf.h>
45 #include <sys/proc.h>
46 #include <sys/mount.h>
47 #include <sys/vnode.h>
48 #include <sys/nlookup.h>
49 #include <sys/mbuf.h>
50 #include <sys/socket.h>
51 #include <sys/stat.h>
52 #include <sys/malloc.h>
53 #include <sys/sysent.h>
54 #include <sys/syscall.h>
55 #include <sys/sysmsg.h>
56 #include <sys/conf.h>
57 #include <sys/objcache.h>
58 #include <sys/jail.h>
59
60 #include <vm/vm.h>
61 #include <vm/vm_object.h>
62 #include <vm/vm_extern.h>
63
64 #include <sys/buf2.h>
65
66 #include "rpcv2.h"
67 #include "nfsproto.h"
68 #include "nfs.h"
69 #include "nfsmount.h"
70 #include "nfsnode.h"
71 #include "xdr_subs.h"
72 #include "nfsm_subs.h"
73 #include "nfsrtt.h"
74
75 #include <netinet/in.h>
76
77 /*
78 * Data items converted to xdr at startup, since they are constant
79 * This is kinda hokey, but may save a little time doing byte swaps
80 */
81 u_int32_t nfs_xdrneg1;
82 u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers;
83 u_int32_t rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr;
84 u_int32_t rpc_auth_kerb;
85 u_int32_t nfs_prog, nfs_true, nfs_false;
86
87 /* And other global data */
88 static enum vtype nv2tov_type[8]= {
89 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VNON, VNON
90 };
91 enum vtype nv3tov_type[8]= {
92 VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
93 };
94
95 int nfs_ticks;
96
97 /*
98 * Protect master lists only. Primary protection uses the per-mount
99 * and per nfssvc_sock tokens.
100 */
101 struct lwkt_token nfs_token = LWKT_TOKEN_INITIALIZER(unp_token);
102
103 static long nfs_pbuf_freecnt = -1; /* start out unlimited */
104
105 struct nfsmount_head nfs_mountq = TAILQ_HEAD_INITIALIZER(nfs_mountq);
106 struct nfssvc_sockhead nfssvc_sockhead;
107 int nfssvc_sockhead_flag;
108 struct nfsd_head nfsd_head;
109 int nfsd_head_flag;
110 struct nfs_bufq nfs_bufq;
111 struct nqfhhashhead *nqfhhashtbl;
112 u_long nqfhhash;
113
114 static int nfs_prev_nfssvc_sy_narg;
115 static sy_call_t *nfs_prev_nfssvc_sy_call;
116
117 #ifndef NFS_NOSERVER
118
119 /*
120 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
121 */
122 int nfsv3_procid[NFS_NPROCS] = {
123 NFSPROC_NULL,
124 NFSPROC_GETATTR,
125 NFSPROC_SETATTR,
126 NFSPROC_NOOP,
127 NFSPROC_LOOKUP,
128 NFSPROC_READLINK,
129 NFSPROC_READ,
130 NFSPROC_NOOP,
131 NFSPROC_WRITE,
132 NFSPROC_CREATE,
133 NFSPROC_REMOVE,
134 NFSPROC_RENAME,
135 NFSPROC_LINK,
136 NFSPROC_SYMLINK,
137 NFSPROC_MKDIR,
138 NFSPROC_RMDIR,
139 NFSPROC_READDIR,
140 NFSPROC_FSSTAT,
141 NFSPROC_NOOP,
142 NFSPROC_NOOP,
143 NFSPROC_NOOP,
144 NFSPROC_NOOP,
145 NFSPROC_NOOP,
146 NFSPROC_NOOP,
147 NFSPROC_NOOP,
148 NFSPROC_NOOP
149 };
150
151 #endif /* NFS_NOSERVER */
152 /*
153 * and the reverse mapping from generic to Version 2 procedure numbers
154 */
155 int nfsv2_procid[NFS_NPROCS] = {
156 NFSV2PROC_NULL,
157 NFSV2PROC_GETATTR,
158 NFSV2PROC_SETATTR,
159 NFSV2PROC_LOOKUP,
160 NFSV2PROC_NOOP,
161 NFSV2PROC_READLINK,
162 NFSV2PROC_READ,
163 NFSV2PROC_WRITE,
164 NFSV2PROC_CREATE,
165 NFSV2PROC_MKDIR,
166 NFSV2PROC_SYMLINK,
167 NFSV2PROC_CREATE,
168 NFSV2PROC_REMOVE,
169 NFSV2PROC_RMDIR,
170 NFSV2PROC_RENAME,
171 NFSV2PROC_LINK,
172 NFSV2PROC_READDIR,
173 NFSV2PROC_NOOP,
174 NFSV2PROC_STATFS,
175 NFSV2PROC_NOOP,
176 NFSV2PROC_NOOP,
177 NFSV2PROC_NOOP,
178 NFSV2PROC_NOOP,
179 NFSV2PROC_NOOP,
180 NFSV2PROC_NOOP,
181 NFSV2PROC_NOOP,
182 };
183
184 #ifndef NFS_NOSERVER
185 /*
186 * Maps errno values to nfs error numbers.
187 * Use NFSERR_IO as the catch all for ones not specifically defined in
188 * RFC 1094.
189 */
190 static u_char nfsrv_v2errmap[ELAST] = {
191 NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO,
192 NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
193 NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO,
194 NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR,
195 NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
196 NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS,
197 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
198 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
199 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
200 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
201 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
202 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
203 NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO,
204 NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE,
205 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
206 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
207 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO,
208 NFSERR_IO /* << Last is 86 */
209 };
210
211 /*
212 * Maps errno values to nfs error numbers.
213 * Although it is not obvious whether or not NFS clients really care if
214 * a returned error value is in the specified list for the procedure, the
215 * safest thing to do is filter them appropriately. For Version 2, the
216 * X/Open XNFS document is the only specification that defines error values
217 * for each RPC (The RFC simply lists all possible error values for all RPCs),
218 * so I have decided to not do this for Version 2.
219 * The first entry is the default error return and the rest are the valid
220 * errors for that RPC in increasing numeric order.
221 */
222 static short nfsv3err_null[] = {
223 0,
224 0,
225 };
226
227 static short nfsv3err_getattr[] = {
228 NFSERR_IO,
229 NFSERR_IO,
230 NFSERR_STALE,
231 NFSERR_BADHANDLE,
232 NFSERR_SERVERFAULT,
233 0,
234 };
235
236 static short nfsv3err_setattr[] = {
237 NFSERR_IO,
238 NFSERR_PERM,
239 NFSERR_IO,
240 NFSERR_ACCES,
241 NFSERR_INVAL,
242 NFSERR_NOSPC,
243 NFSERR_ROFS,
244 NFSERR_DQUOT,
245 NFSERR_STALE,
246 NFSERR_BADHANDLE,
247 NFSERR_NOT_SYNC,
248 NFSERR_SERVERFAULT,
249 0,
250 };
251
252 static short nfsv3err_lookup[] = {
253 NFSERR_IO,
254 NFSERR_NOENT,
255 NFSERR_IO,
256 NFSERR_ACCES,
257 NFSERR_NOTDIR,
258 NFSERR_NAMETOL,
259 NFSERR_STALE,
260 NFSERR_BADHANDLE,
261 NFSERR_SERVERFAULT,
262 0,
263 };
264
265 static short nfsv3err_access[] = {
266 NFSERR_IO,
267 NFSERR_IO,
268 NFSERR_STALE,
269 NFSERR_BADHANDLE,
270 NFSERR_SERVERFAULT,
271 0,
272 };
273
274 static short nfsv3err_readlink[] = {
275 NFSERR_IO,
276 NFSERR_IO,
277 NFSERR_ACCES,
278 NFSERR_INVAL,
279 NFSERR_STALE,
280 NFSERR_BADHANDLE,
281 NFSERR_NOTSUPP,
282 NFSERR_SERVERFAULT,
283 0,
284 };
285
286 static short nfsv3err_read[] = {
287 NFSERR_IO,
288 NFSERR_IO,
289 NFSERR_NXIO,
290 NFSERR_ACCES,
291 NFSERR_INVAL,
292 NFSERR_STALE,
293 NFSERR_BADHANDLE,
294 NFSERR_SERVERFAULT,
295 0,
296 };
297
298 static short nfsv3err_write[] = {
299 NFSERR_IO,
300 NFSERR_IO,
301 NFSERR_ACCES,
302 NFSERR_INVAL,
303 NFSERR_FBIG,
304 NFSERR_NOSPC,
305 NFSERR_ROFS,
306 NFSERR_DQUOT,
307 NFSERR_STALE,
308 NFSERR_BADHANDLE,
309 NFSERR_SERVERFAULT,
310 0,
311 };
312
313 static short nfsv3err_create[] = {
314 NFSERR_IO,
315 NFSERR_IO,
316 NFSERR_ACCES,
317 NFSERR_EXIST,
318 NFSERR_NOTDIR,
319 NFSERR_NOSPC,
320 NFSERR_ROFS,
321 NFSERR_NAMETOL,
322 NFSERR_DQUOT,
323 NFSERR_STALE,
324 NFSERR_BADHANDLE,
325 NFSERR_NOTSUPP,
326 NFSERR_SERVERFAULT,
327 0,
328 };
329
330 static short nfsv3err_mkdir[] = {
331 NFSERR_IO,
332 NFSERR_IO,
333 NFSERR_ACCES,
334 NFSERR_EXIST,
335 NFSERR_NOTDIR,
336 NFSERR_NOSPC,
337 NFSERR_ROFS,
338 NFSERR_NAMETOL,
339 NFSERR_DQUOT,
340 NFSERR_STALE,
341 NFSERR_BADHANDLE,
342 NFSERR_NOTSUPP,
343 NFSERR_SERVERFAULT,
344 0,
345 };
346
347 static short nfsv3err_symlink[] = {
348 NFSERR_IO,
349 NFSERR_IO,
350 NFSERR_ACCES,
351 NFSERR_EXIST,
352 NFSERR_NOTDIR,
353 NFSERR_NOSPC,
354 NFSERR_ROFS,
355 NFSERR_NAMETOL,
356 NFSERR_DQUOT,
357 NFSERR_STALE,
358 NFSERR_BADHANDLE,
359 NFSERR_NOTSUPP,
360 NFSERR_SERVERFAULT,
361 0,
362 };
363
364 static short nfsv3err_mknod[] = {
365 NFSERR_IO,
366 NFSERR_IO,
367 NFSERR_ACCES,
368 NFSERR_EXIST,
369 NFSERR_NOTDIR,
370 NFSERR_NOSPC,
371 NFSERR_ROFS,
372 NFSERR_NAMETOL,
373 NFSERR_DQUOT,
374 NFSERR_STALE,
375 NFSERR_BADHANDLE,
376 NFSERR_NOTSUPP,
377 NFSERR_SERVERFAULT,
378 NFSERR_BADTYPE,
379 0,
380 };
381
382 static short nfsv3err_remove[] = {
383 NFSERR_IO,
384 NFSERR_NOENT,
385 NFSERR_IO,
386 NFSERR_ACCES,
387 NFSERR_NOTDIR,
388 NFSERR_ROFS,
389 NFSERR_NAMETOL,
390 NFSERR_STALE,
391 NFSERR_BADHANDLE,
392 NFSERR_SERVERFAULT,
393 0,
394 };
395
396 static short nfsv3err_rmdir[] = {
397 NFSERR_IO,
398 NFSERR_NOENT,
399 NFSERR_IO,
400 NFSERR_ACCES,
401 NFSERR_EXIST,
402 NFSERR_NOTDIR,
403 NFSERR_INVAL,
404 NFSERR_ROFS,
405 NFSERR_NAMETOL,
406 NFSERR_NOTEMPTY,
407 NFSERR_STALE,
408 NFSERR_BADHANDLE,
409 NFSERR_NOTSUPP,
410 NFSERR_SERVERFAULT,
411 0,
412 };
413
414 static short nfsv3err_rename[] = {
415 NFSERR_IO,
416 NFSERR_NOENT,
417 NFSERR_IO,
418 NFSERR_ACCES,
419 NFSERR_EXIST,
420 NFSERR_XDEV,
421 NFSERR_NOTDIR,
422 NFSERR_ISDIR,
423 NFSERR_INVAL,
424 NFSERR_NOSPC,
425 NFSERR_ROFS,
426 NFSERR_MLINK,
427 NFSERR_NAMETOL,
428 NFSERR_NOTEMPTY,
429 NFSERR_DQUOT,
430 NFSERR_STALE,
431 NFSERR_BADHANDLE,
432 NFSERR_NOTSUPP,
433 NFSERR_SERVERFAULT,
434 0,
435 };
436
437 static short nfsv3err_link[] = {
438 NFSERR_IO,
439 NFSERR_IO,
440 NFSERR_ACCES,
441 NFSERR_EXIST,
442 NFSERR_XDEV,
443 NFSERR_NOTDIR,
444 NFSERR_INVAL,
445 NFSERR_NOSPC,
446 NFSERR_ROFS,
447 NFSERR_MLINK,
448 NFSERR_NAMETOL,
449 NFSERR_DQUOT,
450 NFSERR_STALE,
451 NFSERR_BADHANDLE,
452 NFSERR_NOTSUPP,
453 NFSERR_SERVERFAULT,
454 0,
455 };
456
457 static short nfsv3err_readdir[] = {
458 NFSERR_IO,
459 NFSERR_IO,
460 NFSERR_ACCES,
461 NFSERR_NOTDIR,
462 NFSERR_STALE,
463 NFSERR_BADHANDLE,
464 NFSERR_BAD_COOKIE,
465 NFSERR_TOOSMALL,
466 NFSERR_SERVERFAULT,
467 0,
468 };
469
470 static short nfsv3err_readdirplus[] = {
471 NFSERR_IO,
472 NFSERR_IO,
473 NFSERR_ACCES,
474 NFSERR_NOTDIR,
475 NFSERR_STALE,
476 NFSERR_BADHANDLE,
477 NFSERR_BAD_COOKIE,
478 NFSERR_NOTSUPP,
479 NFSERR_TOOSMALL,
480 NFSERR_SERVERFAULT,
481 0,
482 };
483
484 static short nfsv3err_fsstat[] = {
485 NFSERR_IO,
486 NFSERR_IO,
487 NFSERR_STALE,
488 NFSERR_BADHANDLE,
489 NFSERR_SERVERFAULT,
490 0,
491 };
492
493 static short nfsv3err_fsinfo[] = {
494 NFSERR_STALE,
495 NFSERR_STALE,
496 NFSERR_BADHANDLE,
497 NFSERR_SERVERFAULT,
498 0,
499 };
500
501 static short nfsv3err_pathconf[] = {
502 NFSERR_STALE,
503 NFSERR_STALE,
504 NFSERR_BADHANDLE,
505 NFSERR_SERVERFAULT,
506 0,
507 };
508
509 static short nfsv3err_commit[] = {
510 NFSERR_IO,
511 NFSERR_IO,
512 NFSERR_STALE,
513 NFSERR_BADHANDLE,
514 NFSERR_SERVERFAULT,
515 0,
516 };
517
518 static short *nfsrv_v3errmap[] = {
519 nfsv3err_null,
520 nfsv3err_getattr,
521 nfsv3err_setattr,
522 nfsv3err_lookup,
523 nfsv3err_access,
524 nfsv3err_readlink,
525 nfsv3err_read,
526 nfsv3err_write,
527 nfsv3err_create,
528 nfsv3err_mkdir,
529 nfsv3err_symlink,
530 nfsv3err_mknod,
531 nfsv3err_remove,
532 nfsv3err_rmdir,
533 nfsv3err_rename,
534 nfsv3err_link,
535 nfsv3err_readdir,
536 nfsv3err_readdirplus,
537 nfsv3err_fsstat,
538 nfsv3err_fsinfo,
539 nfsv3err_pathconf,
540 nfsv3err_commit,
541 };
542
543 #endif /* NFS_NOSERVER */
544
545 /*
546 * This needs to return a monotonically increasing or close to monotonically
547 * increasing result, otherwise the write gathering queues won't work
548 * properly.
549 */
550 u_quad_t
nfs_curusec(void)551 nfs_curusec(void)
552 {
553 struct timeval tv;
554
555 getmicrouptime(&tv);
556 return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
557 }
558
559 /*
560 * Called once to initialize data structures...
561 */
562 int
nfs_init(struct vfsconf * vfsp)563 nfs_init(struct vfsconf *vfsp)
564 {
565 callout_init_mp(&nfs_timer_handle);
566
567 nfs_mount_type = vfsp->vfc_typenum;
568 nfsrtt.pos = 0;
569 rpc_vers = txdr_unsigned(RPC_VER2);
570 rpc_call = txdr_unsigned(RPC_CALL);
571 rpc_reply = txdr_unsigned(RPC_REPLY);
572 rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
573 rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
574 rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
575 rpc_autherr = txdr_unsigned(RPC_AUTHERR);
576 rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
577 rpc_auth_kerb = txdr_unsigned(RPCAUTH_KERB4);
578 nfs_prog = txdr_unsigned(NFS_PROG);
579 nfs_true = txdr_unsigned(TRUE);
580 nfs_false = txdr_unsigned(FALSE);
581 nfs_xdrneg1 = txdr_unsigned(-1);
582 nfs_ticks = (hz * NFS_TICKINTVL + 500) / 1000;
583 if (nfs_ticks < 1)
584 nfs_ticks = 1;
585 nfs_nhinit(); /* Init the nfsnode table */
586 #ifndef NFS_NOSERVER
587 nfsrv_init(0); /* Init server data structures */
588 nfsrv_initcache(); /* Init the server request cache */
589 #endif
590
591 /*
592 * Mainly for vkernel operation. If memory is severely limited
593 */
594 if (nfs_maxasyncbio > nmbclusters * MCLBYTES / NFS_MAXDATA / 3)
595 nfs_maxasyncbio = nmbclusters * MCLBYTES / NFS_MAXDATA / 3;
596 if (nfs_maxasyncbio < 4)
597 nfs_maxasyncbio = 4;
598
599 /*
600 * Initialize reply list and start timer
601 */
602 nfs_timer_callout(0);
603
604 #if 1 /* XXX this isn't really needed */
605 nfs_prev_nfssvc_sy_narg = sysent[SYS_nfssvc].sy_narg;
606 sysent[SYS_nfssvc].sy_narg = 2;
607 #endif
608 nfs_prev_nfssvc_sy_call = sysent[SYS_nfssvc].sy_call;
609 sysent[SYS_nfssvc].sy_call = (sy_call_t *)sys_nfssvc;
610
611 nfs_pbuf_freecnt = nswbuf_kva / 2 + 1;
612
613 return (0);
614 }
615
616 int
nfs_uninit(struct vfsconf * vfsp)617 nfs_uninit(struct vfsconf *vfsp)
618 {
619 callout_stop(&nfs_timer_handle);
620 nfs_mount_type = -1;
621 sysent[SYS_nfssvc].sy_narg = nfs_prev_nfssvc_sy_narg;
622 sysent[SYS_nfssvc].sy_call = nfs_prev_nfssvc_sy_call;
623 nfs_nhdestroy(); /* Destroy the nfsnode table */
624 #ifndef NFS_NOSERVER
625 nfsrv_destroycache(); /* Destroy the server request cache */
626 #endif
627 return (0);
628 }
629
630 /*
631 * Attribute cache routines.
632 * nfs_loadattrcache() - loads or updates the cache contents from attributes
633 * that are on the mbuf list
634 * nfs_getattrcache() - returns valid attributes if found in cache, returns
635 * error otherwise
636 */
637
638 /*
639 * Load the attribute cache (that lives in the nfsnode entry) with
640 * the values on the mbuf list. Load *vaper with the attributes. vaper
641 * may be NULL.
642 *
643 * As a side effect n_mtime, which we use to determine if the file was
644 * modified by some other host, is set to the attribute timestamp and
645 * NRMODIFIED is set if the two values differ.
646 *
647 * WARNING: the mtime loaded into vaper does not necessarily represent
648 * n_mtime or n_attr.mtime due to NACC and NUPD.
649 */
650 int
nfs_loadattrcache(struct vnode * vp,struct mbuf ** mdp,caddr_t * dposp,struct vattr * vaper,int lattr_flags)651 nfs_loadattrcache(struct vnode *vp, struct mbuf **mdp, caddr_t *dposp,
652 struct vattr *vaper, int lattr_flags)
653 {
654 struct vattr *vap;
655 struct nfs_fattr *fp;
656 struct nfsnode *np;
657 int32_t t1;
658 caddr_t cp2;
659 int error = 0;
660 int rmajor, rminor;
661 dev_t rdev;
662 struct mbuf *md;
663 enum vtype vtyp;
664 u_short vmode;
665 struct timespec mtime;
666 int v3 = NFS_ISV3(vp);
667
668 md = *mdp;
669 t1 = (mtod(md, caddr_t) + md->m_len) - *dposp;
670 if ((error = nfsm_disct(mdp, dposp, NFSX_FATTR(v3), t1, &cp2)) != 0)
671 return (error);
672 fp = (struct nfs_fattr *)cp2;
673 if (v3) {
674 vtyp = nfsv3tov_type(fp->fa_type);
675 vmode = fxdr_unsigned(u_short, fp->fa_mode);
676 rmajor = (int)fxdr_unsigned(int, fp->fa3_rdev.specdata1);
677 rminor = (int)fxdr_unsigned(int, fp->fa3_rdev.specdata2);
678 fxdr_nfsv3time(&fp->fa3_mtime, &mtime);
679 } else {
680 vtyp = nfsv2tov_type(fp->fa_type);
681 vmode = fxdr_unsigned(u_short, fp->fa_mode);
682 /*
683 * XXX
684 *
685 * The duplicate information returned in fa_type and fa_mode
686 * is an ambiguity in the NFS version 2 protocol.
687 *
688 * VREG should be taken literally as a regular file. If a
689 * server intents to return some type information differently
690 * in the upper bits of the mode field (e.g. for sockets, or
691 * FIFOs), NFSv2 mandates fa_type to be VNON. Anyway, we
692 * leave the examination of the mode bits even in the VREG
693 * case to avoid breakage for bogus servers, but we make sure
694 * that there are actually type bits set in the upper part of
695 * fa_mode (and failing that, trust the va_type field).
696 *
697 * NFSv3 cleared the issue, and requires fa_mode to not
698 * contain any type information (while also introduing sockets
699 * and FIFOs for fa_type).
700 */
701 if (vtyp == VNON || (vtyp == VREG && (vmode & S_IFMT) != 0))
702 vtyp = IFTOVT(vmode);
703 rdev = fxdr_unsigned(int32_t, fp->fa2_rdev);
704 rmajor = umajor(rdev);
705 rminor = uminor(rdev);
706 fxdr_nfsv2time(&fp->fa2_mtime, &mtime);
707
708 /*
709 * Really ugly NFSv2 kludge.
710 */
711 if (vtyp == VCHR && rdev == (dev_t)0xffffffff)
712 vtyp = VFIFO;
713 }
714
715 /*
716 * If v_type == VNON it is a new node, so fill in the v_type,
717 * n_mtime fields. Check to see if it represents a special
718 * device, and if so, check for a possible alias. Once the
719 * correct vnode has been obtained, fill in the rest of the
720 * information.
721 */
722 np = VTONFS(vp);
723 if (vp->v_type != vtyp) {
724 nfs_setvtype(vp, vtyp);
725 if (vp->v_type == VFIFO) {
726 vp->v_ops = &vp->v_mount->mnt_vn_fifo_ops;
727 } else if (vp->v_type == VCHR || vp->v_type == VBLK) {
728 vp->v_ops = &vp->v_mount->mnt_vn_spec_ops;
729 addaliasu(vp, rmajor, rminor);
730 } else {
731 vp->v_ops = &vp->v_mount->mnt_vn_use_ops;
732 }
733 np->n_mtime = mtime.tv_sec;
734 } else if (np->n_mtime != mtime.tv_sec) {
735 /*
736 * If we haven't modified the file locally and the server
737 * timestamp does not match, then the server probably
738 * modified the file. We must flag this condition so
739 * the proper syncnronization can be done. We do not
740 * try to synchronize the state here because that
741 * could lead to an endless recursion.
742 *
743 * XXX loadattrcache can be set during the reply to a write,
744 * before the write timestamp is properly processed. To
745 * avoid unconditionally setting the rmodified bit (which
746 * has the effect of flushing the cache), we only do this
747 * check if the lmodified bit is not set.
748 */
749 np->n_mtime = mtime.tv_sec;
750 if ((lattr_flags & NFS_LATTR_NOMTIMECHECK) == 0)
751 np->n_flag |= NRMODIFIED;
752 }
753 vap = &np->n_vattr;
754 vap->va_type = vtyp;
755 vap->va_mode = (vmode & 07777);
756 vap->va_rmajor = rmajor;
757 vap->va_rminor = rminor;
758 vap->va_mtime = mtime;
759 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
760 if (v3) {
761 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
762 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
763 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
764 vap->va_size = fxdr_hyper(&fp->fa3_size);
765 vap->va_blocksize = NFS_FABLKSIZE;
766 vap->va_bytes = fxdr_hyper(&fp->fa3_used);
767 vap->va_fileid = fxdr_hyper(&fp->fa3_fileid);
768 fxdr_nfsv3time(&fp->fa3_atime, &vap->va_atime);
769 fxdr_nfsv3time(&fp->fa3_ctime, &vap->va_ctime);
770 vap->va_flags = 0;
771 vap->va_filerev = 0;
772 } else {
773 vap->va_nlink = fxdr_unsigned(u_short, fp->fa_nlink);
774 vap->va_uid = fxdr_unsigned(uid_t, fp->fa_uid);
775 vap->va_gid = fxdr_unsigned(gid_t, fp->fa_gid);
776 vap->va_size = fxdr_unsigned(u_int32_t, fp->fa2_size);
777 vap->va_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize);
778 vap->va_bytes = (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks)
779 * NFS_FABLKSIZE;
780 vap->va_fileid = fxdr_unsigned(int32_t, fp->fa2_fileid);
781 fxdr_nfsv2time(&fp->fa2_atime, &vap->va_atime);
782 vap->va_flags = 0;
783 vap->va_ctime.tv_sec = fxdr_unsigned(u_int32_t,
784 fp->fa2_ctime.nfsv2_sec);
785 vap->va_ctime.tv_nsec = 0;
786 vap->va_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec);
787 vap->va_filerev = 0;
788 }
789 np->n_attrstamp = time_uptime;
790 if (vap->va_size != np->n_size) {
791 if (vap->va_type == VREG) {
792 /*
793 * Get rid of all the junk we had before and just
794 * set NRMODIFIED if NLMODIFIED is 0. Depend on
795 * occassionally flushing our dirty buffers to
796 * clear both the NLMODIFIED and NRMODIFIED flags.
797 */
798 if ((np->n_flag & NLMODIFIED) == 0)
799 np->n_flag |= NRMODIFIED;
800 #if 0
801 if ((lattr_flags & NFS_LATTR_NOSHRINK) &&
802 vap->va_size < np->n_size) {
803 /*
804 * We've been told not to shrink the file;
805 * zero np->n_attrstamp to indicate that
806 * the attributes are stale.
807 *
808 * This occurs primarily due to recursive
809 * NFS ops that are executed during periods
810 * where we cannot safely reduce the size of
811 * the file.
812 *
813 * Additionally, write rpcs are broken down
814 * into buffers and np->n_size is
815 * pre-extended. Setting NRMODIFIED here
816 * can result in n_size getting reset to a
817 * lower value, which is NOT what we want.
818 * XXX this needs to be cleaned up a lot
819 * more.
820 */
821 vap->va_size = np->n_size;
822 np->n_attrstamp = 0;
823 if ((np->n_flag & NLMODIFIED) == 0)
824 np->n_flag |= NRMODIFIED;
825 } else if (np->n_flag & NLMODIFIED) {
826 /*
827 * We've modified the file: Use the larger
828 * of our size, and the server's size. At
829 * this point the cache coherency is all
830 * shot to hell. To try to handle multiple
831 * clients appending to the file at the same
832 * time mark that the server has changed
833 * the file if the server's notion of the
834 * file size is larger then our notion.
835 *
836 * XXX this needs work.
837 */
838 if (vap->va_size < np->n_size) {
839 vap->va_size = np->n_size;
840 } else {
841 np->n_size = vap->va_size;
842 np->n_flag |= NRMODIFIED;
843 }
844 } else {
845 /*
846 * Someone changed the file's size on the
847 * server and there are no local changes
848 * to get in the way, set the size and mark
849 * it.
850 */
851 np->n_size = vap->va_size;
852 np->n_flag |= NRMODIFIED;
853 }
854 nvnode_pager_setsize(vp, np->n_size, XXX);
855 #endif
856 } else {
857 np->n_size = vap->va_size;
858 }
859 }
860 if (vaper != NULL) {
861 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(*vap));
862 if (np->n_flag & NCHG) {
863 if (np->n_flag & NACC)
864 vaper->va_atime = np->n_atim;
865 if (np->n_flag & NUPD)
866 vaper->va_mtime = np->n_mtim;
867 }
868 }
869 return (0);
870 }
871
872 #ifdef NFS_ACDEBUG
873 #include <sys/sysctl.h>
874 SYSCTL_DECL(_vfs_nfs);
875 static int nfs_acdebug;
876 SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
877 #endif
878
879 /*
880 * Check the time stamp
881 * If the cache is valid, copy contents to *vap and return 0
882 * otherwise return an error
883 */
884 int
nfs_getattrcache(struct vnode * vp,struct vattr * vaper)885 nfs_getattrcache(struct vnode *vp, struct vattr *vaper)
886 {
887 struct nfsnode *np;
888 struct vattr *vap;
889 struct nfsmount *nmp;
890 int timeo;
891
892 np = VTONFS(vp);
893 vap = &np->n_vattr;
894 nmp = VFSTONFS(vp->v_mount);
895
896 /*
897 * Dynamic timeout based on how recently the file was modified.
898 * n_mtime is always valid.
899 */
900 timeo = (get_approximate_time_t() - np->n_mtime) / 60;
901
902 #ifdef NFS_ACDEBUG
903 if (nfs_acdebug>1)
904 kprintf("nfs_getattrcache: initial timeo = %d\n", timeo);
905 #endif
906
907 if (vap->va_type == VDIR) {
908 if ((np->n_flag & NLMODIFIED) || timeo < nmp->nm_acdirmin)
909 timeo = nmp->nm_acdirmin;
910 else if (timeo > nmp->nm_acdirmax)
911 timeo = nmp->nm_acdirmax;
912 } else {
913 if ((np->n_flag & NLMODIFIED) || timeo < nmp->nm_acregmin)
914 timeo = nmp->nm_acregmin;
915 else if (timeo > nmp->nm_acregmax)
916 timeo = nmp->nm_acregmax;
917 }
918
919 #ifdef NFS_ACDEBUG
920 if (nfs_acdebug > 2)
921 kprintf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
922 nmp->nm_acregmin, nmp->nm_acregmax,
923 nmp->nm_acdirmin, nmp->nm_acdirmax);
924
925 if (nfs_acdebug)
926 kprintf("nfs_getattrcache: age = %d; final timeo = %d\n",
927 (int)(time_uptime - np->n_attrstamp), timeo);
928 #endif
929
930 if (np->n_attrstamp == 0 || (time_uptime - np->n_attrstamp) >= timeo) {
931 nfsstats.attrcache_misses++;
932 return (ENOENT);
933 }
934 nfsstats.attrcache_hits++;
935
936 /*
937 * Our attribute cache can be stale due to modifications made on
938 * this host. XXX this is a bad hack. We need a more deterministic
939 * means of finding out which np fields are valid verses attr cache
940 * fields. We really should update the vattr info on the fly when
941 * making local changes.
942 */
943 if (vap->va_size != np->n_size) {
944 if (vap->va_type == VREG) {
945 if (np->n_flag & NLMODIFIED)
946 vap->va_size = np->n_size;
947 nfs_meta_setsize(vp, curthread, vap->va_size, 0);
948 } else {
949 np->n_size = vap->va_size;
950 }
951 }
952 bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
953 if (np->n_flag & NCHG) {
954 if (np->n_flag & NACC)
955 vaper->va_atime = np->n_atim;
956 if (np->n_flag & NUPD)
957 vaper->va_mtime = np->n_mtim;
958 }
959 return (0);
960 }
961
962 #ifndef NFS_NOSERVER
963
964 /*
965 * Set up nameidata for a lookup() call and do it.
966 *
967 * If pubflag is set, this call is done for a lookup operation on the
968 * public filehandle. In that case we allow crossing mountpoints and
969 * absolute pathnames. However, the caller is expected to check that
970 * the lookup result is within the public fs, and deny access if
971 * it is not.
972 *
973 * dirp may be set whether an error is returned or not, and must be
974 * released by the caller.
975 *
976 * On return nd->nl_nch usually points to the target ncp, which may represent
977 * a negative hit.
978 *
979 * NOTE: the caller must call nlookup_done(nd) unconditionally on return
980 * to cleanup.
981 */
982 int
nfs_namei(struct nlookupdata * nd,struct ucred * cred,int nflags,struct vnode ** dvpp,struct vnode ** vpp,fhandle_t * fhp,int len,struct nfssvc_sock * slp,struct sockaddr * nam,struct mbuf ** mdp,caddr_t * dposp,struct vnode ** dirpp,struct thread * td,int kerbflag,int pubflag)983 nfs_namei(struct nlookupdata *nd, struct ucred *cred, int nflags,
984 struct vnode **dvpp, struct vnode **vpp,
985 fhandle_t *fhp, int len,
986 struct nfssvc_sock *slp, struct sockaddr *nam, struct mbuf **mdp,
987 caddr_t *dposp, struct vnode **dirpp, struct thread *td,
988 int kerbflag, int pubflag)
989 {
990 int i, rem;
991 struct mbuf *md;
992 char *fromcp, *tocp, *cp;
993 char *namebuf;
994 struct nchandle nch;
995 struct vnode *dp;
996 struct mount *mp;
997 int error, rdonly;
998 int isretry;
999
1000 /*
1001 * Check retry case
1002 */
1003 if (nd->nl_flags & NLC_HASBUF) {
1004 namebuf = nd->nl_path;
1005 nd->nl_flags &= ~NLC_HASBUF;
1006 nd->nl_path = NULL;
1007 isretry = 1;
1008 } else {
1009 namebuf = objcache_get(namei_oc, M_WAITOK);
1010 isretry = 0;
1011 }
1012 *dirpp = NULL;
1013
1014 /*
1015 * Copy the name from the mbuf list to namebuf.
1016 */
1017 if (isretry == 0) {
1018 fromcp = *dposp;
1019 tocp = namebuf;
1020 md = *mdp;
1021 rem = mtod(md, caddr_t) + md->m_len - fromcp;
1022
1023 for (i = 0; i < len; i++) {
1024 while (rem == 0) {
1025 md = md->m_next;
1026 if (md == NULL) {
1027 error = EBADRPC;
1028 goto out;
1029 }
1030 fromcp = mtod(md, caddr_t);
1031 rem = md->m_len;
1032 }
1033 if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) {
1034 error = EACCES;
1035 goto out;
1036 }
1037 *tocp++ = *fromcp++;
1038 rem--;
1039 }
1040 *tocp = '\0';
1041 *mdp = md;
1042 *dposp = fromcp;
1043 len = nfsm_rndup(len)-len;
1044 if (len > 0) {
1045 if (rem >= len)
1046 *dposp += len;
1047 else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
1048 goto out;
1049 }
1050 }
1051
1052 /*
1053 * Extract and set starting directory. The returned dp is refd
1054 * but not locked.
1055 */
1056 error = nfsrv_fhtovp(fhp, FALSE, &mp, &dp, cred, slp,
1057 nam, &rdonly, kerbflag, pubflag);
1058 if (error)
1059 goto out;
1060 if (dp->v_type != VDIR) {
1061 vrele(dp);
1062 error = ENOTDIR;
1063 goto out;
1064 }
1065
1066 /*
1067 * Set return directory. Reference to dp is implicitly transfered
1068 * to the returned pointer. This must be set before we potentially
1069 * goto out below.
1070 */
1071 *dirpp = dp;
1072
1073 /*
1074 * read-only - NLC_DELETE, NLC_RENAME_DST are disallowed. NLC_CREATE
1075 * is passed through to nlookup() and will be disallowed
1076 * if the file does not already exist.
1077 */
1078 if (rdonly) {
1079 nflags |= NLC_NFS_RDONLY;
1080 if (nflags & (NLC_DELETE | NLC_RENAME_DST)) {
1081 error = EROFS;
1082 goto out;
1083 }
1084 }
1085
1086 /*
1087 * Oh joy. For WebNFS, handle those pesky '%' escapes,
1088 * and the 'native path' indicator.
1089 */
1090 if (pubflag) {
1091 cp = objcache_get(namei_oc, M_WAITOK);
1092 fromcp = namebuf;
1093 tocp = cp;
1094 if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) {
1095 switch ((unsigned char)*fromcp) {
1096 case WEBNFS_NATIVE_CHAR:
1097 /*
1098 * 'Native' path for us is the same
1099 * as a path according to the NFS spec,
1100 * just skip the escape char.
1101 */
1102 fromcp++;
1103 break;
1104 /*
1105 * More may be added in the future, range 0x80-0xff
1106 */
1107 default:
1108 error = EIO;
1109 objcache_put(namei_oc, cp);
1110 goto out;
1111 }
1112 }
1113 /*
1114 * Translate the '%' escapes, URL-style.
1115 */
1116 while (*fromcp != '\0') {
1117 if (*fromcp == WEBNFS_ESC_CHAR) {
1118 if (fromcp[1] != '\0' && fromcp[2] != '\0') {
1119 fromcp++;
1120 *tocp++ = HEXSTRTOI(fromcp);
1121 fromcp += 2;
1122 continue;
1123 } else {
1124 error = ENOENT;
1125 objcache_put(namei_oc, cp);
1126 goto out;
1127 }
1128 } else
1129 *tocp++ = *fromcp++;
1130 }
1131 *tocp = '\0';
1132 objcache_put(namei_oc, namebuf);
1133 namebuf = cp;
1134 }
1135
1136 /*
1137 * Setup for search. We need to get a start directory from dp. Note
1138 * that dp is ref'd, but we no longer 'own' the ref (*dirpp owns it).
1139 */
1140 if (pubflag == 0) {
1141 nflags |= NLC_NFS_NOSOFTLINKTRAV;
1142 nflags |= NLC_NOCROSSMOUNT;
1143 }
1144
1145 /*
1146 * We need a starting ncp from the directory vnode dp. dp must not
1147 * be locked. The returned ncp will be refd but not locked.
1148 *
1149 * If no suitable ncp is found we instruct cache_fromdvp() to create
1150 * one. If this fails the directory has probably been removed while
1151 * the target was chdir'd into it and any further lookup will fail.
1152 */
1153 if ((error = cache_fromdvp(dp, cred, 1, &nch)) != 0)
1154 goto out;
1155 nlookup_init_raw(nd, namebuf, UIO_SYSSPACE, nflags, cred, &nch);
1156 cache_drop(&nch);
1157
1158 /*
1159 * Ok, do the lookup.
1160 */
1161 error = nlookup(nd);
1162
1163 /*
1164 * If no error occured return the requested dvpp and vpp. If
1165 * NLC_CREATE was specified nd->nl_nch may represent a negative
1166 * cache hit in which case we do not attempt to obtain the vp.
1167 */
1168 if (error == 0) {
1169 if (dvpp) {
1170 if (nd->nl_nch.ncp->nc_parent) {
1171 nch = nd->nl_nch;
1172 nch.ncp = nch.ncp->nc_parent;
1173 cache_hold(&nch);
1174 cache_lock(&nch);
1175 error = cache_vget(&nch, nd->nl_cred,
1176 LK_EXCLUSIVE, dvpp);
1177 cache_put(&nch);
1178 } else {
1179 error = ENXIO;
1180 }
1181 }
1182 if (vpp && nd->nl_nch.ncp->nc_vp) {
1183 error = cache_vget(&nd->nl_nch, nd->nl_cred, LK_EXCLUSIVE, vpp);
1184 }
1185 if (error) {
1186 if (dvpp && *dvpp) {
1187 vput(*dvpp);
1188 *dvpp = NULL;
1189 }
1190 if (vpp && *vpp) {
1191 vput(*vpp);
1192 *vpp = NULL;
1193 }
1194 }
1195 }
1196
1197 /*
1198 * Finish up.
1199 */
1200 out:
1201 objcache_put(namei_oc, namebuf);
1202 return (error);
1203 }
1204
1205 /*
1206 * nfsrv_fhtovp() - convert a fh to a vnode ptr (optionally locked)
1207 * - look up fsid in mount list (if not found ret error)
1208 * - get vp and export rights by calling VFS_FHTOVP()
1209 * - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
1210 * - if not lockflag unlock it with vn_unlock()
1211 */
1212 int
nfsrv_fhtovp(fhandle_t * fhp,int lockflag,struct mount ** mpp,struct vnode ** vpp,struct ucred * cred,struct nfssvc_sock * slp,struct sockaddr * nam,int * rdonlyp,int kerbflag,int pubflag)1213 nfsrv_fhtovp(fhandle_t *fhp, int lockflag,
1214 struct mount **mpp, struct vnode **vpp,
1215 struct ucred *cred, struct nfssvc_sock *slp, struct sockaddr *nam,
1216 int *rdonlyp, int kerbflag, int pubflag)
1217 {
1218 struct mount *mp;
1219 int i;
1220 struct ucred *credanon;
1221 int error, exflags;
1222 #ifdef MNT_EXNORESPORT /* XXX needs mountd and /etc/exports help yet */
1223 struct sockaddr_int *saddr;
1224 #endif
1225
1226 *vpp = NULL;
1227 *mpp = NULL;
1228
1229 if (nfs_ispublicfh(fhp)) {
1230 if (!pubflag || !nfs_pub.np_valid)
1231 return (ESTALE);
1232 fhp = &nfs_pub.np_handle;
1233 }
1234
1235 mp = *mpp = vfs_getvfs(&fhp->fh_fsid);
1236 if (mp == NULL)
1237 return (ESTALE);
1238 error = VFS_CHECKEXP(mp, nam, &exflags, &credanon);
1239 if (error) {
1240 mount_drop(mp);
1241 return (error);
1242 }
1243 error = VFS_FHTOVP(mp, NULL, &fhp->fh_fid, vpp);
1244 mount_drop(mp);
1245 if (error)
1246 return (ESTALE);
1247 #ifdef MNT_EXNORESPORT
1248 if (!(exflags & (MNT_EXNORESPORT|MNT_EXPUBLIC))) {
1249 saddr = (struct sockaddr_in *)nam;
1250 if (saddr->sin_family == AF_INET &&
1251 ntohs(saddr->sin_port) >= IPPORT_RESERVED) {
1252 vput(*vpp);
1253 *vpp = NULL;
1254 return (NFSERR_AUTHERR | AUTH_TOOWEAK);
1255 }
1256 }
1257 #endif
1258 /*
1259 * Check/setup credentials.
1260 */
1261 if (exflags & MNT_EXKERB) {
1262 if (!kerbflag) {
1263 vput(*vpp);
1264 *vpp = NULL;
1265 return (NFSERR_AUTHERR | AUTH_TOOWEAK);
1266 }
1267 } else if (kerbflag) {
1268 vput(*vpp);
1269 *vpp = NULL;
1270 return (NFSERR_AUTHERR | AUTH_TOOWEAK);
1271 } else if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) {
1272 cred->cr_uid = credanon->cr_uid;
1273 for (i = 0; i < credanon->cr_ngroups && i < NGROUPS; i++)
1274 cred->cr_groups[i] = credanon->cr_groups[i];
1275 cred->cr_ngroups = i;
1276 }
1277 if (exflags & MNT_EXRDONLY)
1278 *rdonlyp = 1;
1279 else
1280 *rdonlyp = 0;
1281
1282 if (!lockflag)
1283 vn_unlock(*vpp);
1284 return (0);
1285 }
1286
1287 /*
1288 * WebNFS: check if a filehandle is a public filehandle. For v3, this
1289 * means a length of 0, for v2 it means all zeroes. nfsm_srvmtofh has
1290 * transformed this to all zeroes in both cases, so check for it.
1291 */
1292 int
nfs_ispublicfh(fhandle_t * fhp)1293 nfs_ispublicfh(fhandle_t *fhp)
1294 {
1295 char *cp = (char *)fhp;
1296 int i;
1297
1298 for (i = 0; i < NFSX_V3FH; i++)
1299 if (*cp++ != 0)
1300 return (FALSE);
1301 return (TRUE);
1302 }
1303
1304 #endif /* NFS_NOSERVER */
1305 /*
1306 * This function compares two net addresses by family and returns TRUE
1307 * if they are the same host.
1308 * If there is any doubt, return FALSE.
1309 * The AF_INET family is handled as a special case so that address mbufs
1310 * don't need to be saved to store "struct in_addr", which is only 4 bytes.
1311 */
1312 int
netaddr_match(int family,union nethostaddr * haddr,struct sockaddr * nam)1313 netaddr_match(int family, union nethostaddr *haddr, struct sockaddr *nam)
1314 {
1315 struct sockaddr_in *inetaddr;
1316
1317 switch (family) {
1318 case AF_INET:
1319 inetaddr = (struct sockaddr_in *)nam;
1320 if (inetaddr->sin_family == AF_INET &&
1321 inetaddr->sin_addr.s_addr == haddr->had_inetaddr)
1322 return (1);
1323 break;
1324 default:
1325 break;
1326 }
1327 return (0);
1328 }
1329
1330 static nfsuint64 nfs_nullcookie = { { 0, 0 } };
1331 /*
1332 * This function finds the directory cookie that corresponds to the
1333 * logical byte offset given.
1334 */
1335 nfsuint64 *
nfs_getcookie(struct nfsnode * np,off_t off,int add)1336 nfs_getcookie(struct nfsnode *np, off_t off, int add)
1337 {
1338 struct nfsdmap *dp, *dp2;
1339 int pos;
1340
1341 pos = (uoff_t)off / NFS_DIRBLKSIZ;
1342 if (pos == 0 || off < 0) {
1343 #ifdef DIAGNOSTIC
1344 if (add)
1345 panic("nfs getcookie add at <= 0");
1346 #endif
1347 return (&nfs_nullcookie);
1348 }
1349 pos--;
1350 dp = np->n_cookies.lh_first;
1351 if (!dp) {
1352 if (add) {
1353 dp = kmalloc(sizeof(struct nfsdmap), M_NFSDIROFF,
1354 M_WAITOK);
1355 dp->ndm_eocookie = 0;
1356 LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
1357 } else
1358 return (NULL);
1359 }
1360 while (pos >= NFSNUMCOOKIES) {
1361 pos -= NFSNUMCOOKIES;
1362 if (dp->ndm_list.le_next) {
1363 if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
1364 pos >= dp->ndm_eocookie)
1365 return (NULL);
1366 dp = dp->ndm_list.le_next;
1367 } else if (add) {
1368 dp2 = kmalloc(sizeof(struct nfsdmap), M_NFSDIROFF,
1369 M_WAITOK);
1370 dp2->ndm_eocookie = 0;
1371 LIST_INSERT_AFTER(dp, dp2, ndm_list);
1372 dp = dp2;
1373 } else
1374 return (NULL);
1375 }
1376 if (pos >= dp->ndm_eocookie) {
1377 if (add)
1378 dp->ndm_eocookie = pos + 1;
1379 else
1380 return (NULL);
1381 }
1382 return (&dp->ndm_cookies[pos]);
1383 }
1384
1385 /*
1386 * Invalidate cached directory information, except for the actual directory
1387 * blocks (which are invalidated separately).
1388 * Done mainly to avoid the use of stale offset cookies.
1389 */
1390 void
nfs_invaldir(struct vnode * vp)1391 nfs_invaldir(struct vnode *vp)
1392 {
1393 struct nfsnode *np = VTONFS(vp);
1394
1395 #ifdef DIAGNOSTIC
1396 if (vp->v_type != VDIR)
1397 panic("nfs: invaldir not dir");
1398 #endif
1399 np->n_direofoffset = 0;
1400 np->n_cookieverf.nfsuquad[0] = 0;
1401 np->n_cookieverf.nfsuquad[1] = 0;
1402 if (np->n_cookies.lh_first)
1403 np->n_cookies.lh_first->ndm_eocookie = 0;
1404 }
1405
1406 /*
1407 * Set the v_type field for an NFS client's vnode and initialize for
1408 * buffer cache operations if necessary.
1409 */
1410 void
nfs_setvtype(struct vnode * vp,enum vtype vtyp)1411 nfs_setvtype(struct vnode *vp, enum vtype vtyp)
1412 {
1413 vp->v_type = vtyp;
1414
1415 switch(vtyp) {
1416 case VREG:
1417 case VDIR:
1418 case VLNK:
1419 /*
1420 * Needs VMIO, size not yet known, and blocksize
1421 * is not really relevant if we are passing a
1422 * filesize of 0.
1423 */
1424 vinitvmio(vp, 0, PAGE_SIZE, -1);
1425 break;
1426 default:
1427 break;
1428 }
1429 }
1430
1431 /*
1432 * The write verifier has changed (probably due to a server reboot), so all
1433 * B_NEEDCOMMIT blocks will have to be written again. Since they are on the
1434 * dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
1435 * and B_CLUSTEROK flags. Once done the new write verifier can be set for the
1436 * mount point.
1437 *
1438 * B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
1439 * writes are not clusterable.
1440 */
1441
1442 static int nfs_clearcommit_bp(struct buf *bp, void *data __unused);
1443 static int nfs_clearcommit_callback(struct mount *mp, struct vnode *vp,
1444 void *data __unused);
1445
1446 void
nfs_clearcommit(struct mount * mp)1447 nfs_clearcommit(struct mount *mp)
1448 {
1449 vsyncscan(mp, VMSC_NOWAIT, nfs_clearcommit_callback, NULL);
1450 }
1451
1452 static int
nfs_clearcommit_callback(struct mount * mp,struct vnode * vp,void * data __unused)1453 nfs_clearcommit_callback(struct mount *mp, struct vnode *vp,
1454 void *data __unused)
1455 {
1456 lwkt_gettoken(&vp->v_token);
1457 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
1458 nfs_clearcommit_bp, NULL);
1459 lwkt_reltoken(&vp->v_token);
1460
1461 return(0);
1462 }
1463
1464 static int
nfs_clearcommit_bp(struct buf * bp,void * data __unused)1465 nfs_clearcommit_bp(struct buf *bp, void *data __unused)
1466 {
1467 if (BUF_LOCKINUSE(bp) == 0 &&
1468 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
1469 == (B_DELWRI | B_NEEDCOMMIT)) {
1470 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1471 }
1472 return(0);
1473 }
1474
1475 #ifndef NFS_NOSERVER
1476 /*
1477 * Map errnos to NFS error numbers. For Version 3 also filter out error
1478 * numbers not specified for the associated procedure.
1479 */
1480 int
nfsrv_errmap(struct nfsrv_descript * nd,int err)1481 nfsrv_errmap(struct nfsrv_descript *nd, int err)
1482 {
1483 short *defaulterrp, *errp;
1484
1485 if (nd->nd_flag & ND_NFSV3) {
1486 if (nd->nd_procnum <= NFSPROC_COMMIT) {
1487 errp = defaulterrp = nfsrv_v3errmap[nd->nd_procnum];
1488 while (*++errp) {
1489 if (*errp == err)
1490 return (err);
1491 else if (*errp > err)
1492 break;
1493 }
1494 return ((int)*defaulterrp);
1495 } else
1496 return (err & 0xffff);
1497 }
1498 if (err <= ELAST)
1499 return ((int)nfsrv_v2errmap[err - 1]);
1500 return (NFSERR_IO);
1501 }
1502
1503 /*
1504 * Sort the group list in increasing numerical order.
1505 * (Insertion sort by Chris Torek, who was grossed out by the bubble sort
1506 * that used to be here.)
1507 */
1508 void
nfsrvw_sort(gid_t * list,int num)1509 nfsrvw_sort(gid_t *list, int num)
1510 {
1511 int i, j;
1512 gid_t v;
1513
1514 /* Insertion sort. */
1515 for (i = 1; i < num; i++) {
1516 v = list[i];
1517 /* find correct slot for value v, moving others up */
1518 for (j = i; --j >= 0 && v < list[j];)
1519 list[j + 1] = list[j];
1520 list[j + 1] = v;
1521 }
1522 }
1523
1524 /*
1525 * copy credentials making sure that the result can be compared with bcmp().
1526 */
1527 void
nfsrv_setcred(struct ucred * incred,struct ucred * outcred)1528 nfsrv_setcred(struct ucred *incred, struct ucred *outcred)
1529 {
1530 int i;
1531
1532 bzero((caddr_t)outcred, sizeof (struct ucred));
1533 outcred->cr_ref = 1;
1534 outcred->cr_uid = incred->cr_uid;
1535 outcred->cr_ngroups = incred->cr_ngroups;
1536 for (i = 0; i < incred->cr_ngroups; i++)
1537 outcred->cr_groups[i] = incred->cr_groups[i];
1538 nfsrvw_sort(outcred->cr_groups, outcred->cr_ngroups);
1539 }
1540 #endif /* NFS_NOSERVER */
1541
1542 /*
1543 * Hold a ucred in nfs_node. Discard prison information, otherwise
1544 * prisons might stick around indefinitely due to NFS node caching.
1545 *
1546 * XXX may cause a large number of cred structures in the system
1547 * to accumulate.
1548 */
1549 struct ucred *
nfs_crhold(struct ucred * cred)1550 nfs_crhold(struct ucred *cred)
1551 {
1552 if (cred) {
1553 if (cred->cr_prison) {
1554 cred = crdup_nocaps(cred);
1555 } else {
1556 cred = crhold(cred);
1557 }
1558 }
1559 return cred;
1560 }
1561
1562 /*
1563 * Return whether two ucreds are the same insofar as NFS cares about.
1564 */
1565 int
nfs_crsame(struct ucred * cr1,struct ucred * cr2)1566 nfs_crsame(struct ucred *cr1, struct ucred *cr2)
1567 {
1568 if (cr1 != cr2) {
1569 if (cr1 == NULL || cr2 == NULL)
1570 return (cr1 == cr2);
1571 if (cr1->cr_uid != cr2->cr_uid ||
1572 cr1->cr_ruid != cr2->cr_ruid ||
1573 cr1->cr_rgid != cr2->cr_rgid ||
1574 cr1->cr_ngroups != cr2->cr_ngroups) {
1575 return 0;
1576 }
1577 if (bcmp(cr1->cr_groups, cr2->cr_groups,
1578 cr1->cr_ngroups * sizeof(cr1->cr_groups[0])) != 0) {
1579 return 0;
1580 }
1581 }
1582 return 1;
1583 }
1584