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1/*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * TODO: Neil Brown made the following observation: We currently
36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
37 * never release any of that until the request is complete.
38 * It would be good to calculate a new maximum response size while
39 * decoding the COMPOUND, and call svc_reserve with this number
40 * at the end of nfs4svc_decode_compoundargs.
41 */
42
43#include <linux/slab.h>
44#include <linux/namei.h>
45#include <linux/statfs.h>
46#include <linux/utsname.h>
47#include <linux/pagemap.h>
48#include <linux/sunrpc/svcauth_gss.h>
49
50#include "idmap.h"
51#include "acl.h"
52#include "xdr4.h"
53#include "vfs.h"
54#include "state.h"
55#include "cache.h"
56
57#define NFSDDBG_FACILITY NFSDDBG_XDR
58
59/*
60 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
61 * directory in order to indicate to the client that a filesystem boundary is present
62 * We use a fixed fsid for a referral
63 */
64#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
65#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
66
67static __be32
68check_filename(char *str, int len, __be32 err)
69{
70 int i;
71
72 if (len == 0)
73 return nfserr_inval;
74 if (isdotent(str, len))
75 return err;
76 for (i = 0; i < len; i++)
77 if (str[i] == '/')
78 return err;
79 return 0;
80}
81
82#define DECODE_HEAD \
83 __be32 *p; \
84 __be32 status
85#define DECODE_TAIL \
86 status = 0; \
87out: \
88 return status; \
89xdr_error: \
90 dprintk("NFSD: xdr error (%s:%d)\n", \
91 __FILE__, __LINE__); \
92 status = nfserr_bad_xdr; \
93 goto out
94
95#define READ32(x) (x) = ntohl(*p++)
96#define READ64(x) do { \
97 (x) = (u64)ntohl(*p++) << 32; \
98 (x) |= ntohl(*p++); \
99} while (0)
100#define READTIME(x) do { \
101 p++; \
102 (x) = ntohl(*p++); \
103 p++; \
104} while (0)
105#define READMEM(x,nbytes) do { \
106 x = (char *)p; \
107 p += XDR_QUADLEN(nbytes); \
108} while (0)
109#define SAVEMEM(x,nbytes) do { \
110 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
111 savemem(argp, p, nbytes) : \
112 (char *)p)) { \
113 dprintk("NFSD: xdr error (%s:%d)\n", \
114 __FILE__, __LINE__); \
115 goto xdr_error; \
116 } \
117 p += XDR_QUADLEN(nbytes); \
118} while (0)
119#define COPYMEM(x,nbytes) do { \
120 memcpy((x), p, nbytes); \
121 p += XDR_QUADLEN(nbytes); \
122} while (0)
123
124/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
125#define READ_BUF(nbytes) do { \
126 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
127 p = argp->p; \
128 argp->p += XDR_QUADLEN(nbytes); \
129 } else if (!(p = read_buf(argp, nbytes))) { \
130 dprintk("NFSD: xdr error (%s:%d)\n", \
131 __FILE__, __LINE__); \
132 goto xdr_error; \
133 } \
134} while (0)
135
136static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
137{
138 /* We want more bytes than seem to be available.
139 * Maybe we need a new page, maybe we have just run out
140 */
141 unsigned int avail = (char *)argp->end - (char *)argp->p;
142 __be32 *p;
143 if (avail + argp->pagelen < nbytes)
144 return NULL;
145 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
146 return NULL;
147 /* ok, we can do it with the current plus the next page */
148 if (nbytes <= sizeof(argp->tmp))
149 p = argp->tmp;
150 else {
151 kfree(argp->tmpp);
152 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
153 if (!p)
154 return NULL;
155
156 }
157 /*
158 * The following memcpy is safe because read_buf is always
159 * called with nbytes > avail, and the two cases above both
160 * guarantee p points to at least nbytes bytes.
161 */
162 memcpy(p, argp->p, avail);
163 /* step to next page */
164 argp->p = page_address(argp->pagelist[0]);
165 argp->pagelist++;
166 if (argp->pagelen < PAGE_SIZE) {
167 argp->end = argp->p + (argp->pagelen>>2);
168 argp->pagelen = 0;
169 } else {
170 argp->end = argp->p + (PAGE_SIZE>>2);
171 argp->pagelen -= PAGE_SIZE;
172 }
173 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
174 argp->p += XDR_QUADLEN(nbytes - avail);
175 return p;
176}
177
178static int zero_clientid(clientid_t *clid)
179{
180 return (clid->cl_boot == 0) && (clid->cl_id == 0);
181}
182
183static int
184defer_free(struct nfsd4_compoundargs *argp,
185 void (*release)(const void *), void *p)
186{
187 struct tmpbuf *tb;
188
189 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
190 if (!tb)
191 return -ENOMEM;
192 tb->buf = p;
193 tb->release = release;
194 tb->next = argp->to_free;
195 argp->to_free = tb;
196 return 0;
197}
198
199static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
200{
201 if (p == argp->tmp) {
202 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
203 if (!p)
204 return NULL;
205 } else {
206 BUG_ON(p != argp->tmpp);
207 argp->tmpp = NULL;
208 }
209 if (defer_free(argp, kfree, p)) {
210 kfree(p);
211 return NULL;
212 } else
213 return (char *)p;
214}
215
216static __be32
217nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
218{
219 u32 bmlen;
220 DECODE_HEAD;
221
222 bmval[0] = 0;
223 bmval[1] = 0;
224 bmval[2] = 0;
225
226 READ_BUF(4);
227 READ32(bmlen);
228 if (bmlen > 1000)
229 goto xdr_error;
230
231 READ_BUF(bmlen << 2);
232 if (bmlen > 0)
233 READ32(bmval[0]);
234 if (bmlen > 1)
235 READ32(bmval[1]);
236 if (bmlen > 2)
237 READ32(bmval[2]);
238
239 DECODE_TAIL;
240}
241
242static __be32
243nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
244 struct iattr *iattr, struct nfs4_acl **acl)
245{
246 int expected_len, len = 0;
247 u32 dummy32;
248 char *buf;
249 int host_err;
250
251 DECODE_HEAD;
252 iattr->ia_valid = 0;
253 if ((status = nfsd4_decode_bitmap(argp, bmval)))
254 return status;
255
256 READ_BUF(4);
257 READ32(expected_len);
258
259 if (bmval[0] & FATTR4_WORD0_SIZE) {
260 READ_BUF(8);
261 len += 8;
262 READ64(iattr->ia_size);
263 iattr->ia_valid |= ATTR_SIZE;
264 }
265 if (bmval[0] & FATTR4_WORD0_ACL) {
266 int nace;
267 struct nfs4_ace *ace;
268
269 READ_BUF(4); len += 4;
270 READ32(nace);
271
272 if (nace > NFS4_ACL_MAX)
273 return nfserr_resource;
274
275 *acl = nfs4_acl_new(nace);
276 if (*acl == NULL) {
277 host_err = -ENOMEM;
278 goto out_nfserr;
279 }
280 defer_free(argp, kfree, *acl);
281
282 (*acl)->naces = nace;
283 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
284 READ_BUF(16); len += 16;
285 READ32(ace->type);
286 READ32(ace->flag);
287 READ32(ace->access_mask);
288 READ32(dummy32);
289 READ_BUF(dummy32);
290 len += XDR_QUADLEN(dummy32) << 2;
291 READMEM(buf, dummy32);
292 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
293 status = nfs_ok;
294 if (ace->whotype != NFS4_ACL_WHO_NAMED)
295 ace->who = 0;
296 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
297 status = nfsd_map_name_to_gid(argp->rqstp,
298 buf, dummy32, &ace->who);
299 else
300 status = nfsd_map_name_to_uid(argp->rqstp,
301 buf, dummy32, &ace->who);
302 if (status)
303 return status;
304 }
305 } else
306 *acl = NULL;
307 if (bmval[1] & FATTR4_WORD1_MODE) {
308 READ_BUF(4);
309 len += 4;
310 READ32(iattr->ia_mode);
311 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
312 iattr->ia_valid |= ATTR_MODE;
313 }
314 if (bmval[1] & FATTR4_WORD1_OWNER) {
315 READ_BUF(4);
316 len += 4;
317 READ32(dummy32);
318 READ_BUF(dummy32);
319 len += (XDR_QUADLEN(dummy32) << 2);
320 READMEM(buf, dummy32);
321 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
322 return status;
323 iattr->ia_valid |= ATTR_UID;
324 }
325 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
326 READ_BUF(4);
327 len += 4;
328 READ32(dummy32);
329 READ_BUF(dummy32);
330 len += (XDR_QUADLEN(dummy32) << 2);
331 READMEM(buf, dummy32);
332 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
333 return status;
334 iattr->ia_valid |= ATTR_GID;
335 }
336 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
337 READ_BUF(4);
338 len += 4;
339 READ32(dummy32);
340 switch (dummy32) {
341 case NFS4_SET_TO_CLIENT_TIME:
342 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
343 all 32 bits of 'nseconds'. */
344 READ_BUF(12);
345 len += 12;
346 READ32(dummy32);
347 if (dummy32)
348 return nfserr_inval;
349 READ32(iattr->ia_atime.tv_sec);
350 READ32(iattr->ia_atime.tv_nsec);
351 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
352 return nfserr_inval;
353 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
354 break;
355 case NFS4_SET_TO_SERVER_TIME:
356 iattr->ia_valid |= ATTR_ATIME;
357 break;
358 default:
359 goto xdr_error;
360 }
361 }
362 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
363 READ_BUF(4);
364 len += 4;
365 READ32(dummy32);
366 switch (dummy32) {
367 case NFS4_SET_TO_CLIENT_TIME:
368 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
369 all 32 bits of 'nseconds'. */
370 READ_BUF(12);
371 len += 12;
372 READ32(dummy32);
373 if (dummy32)
374 return nfserr_inval;
375 READ32(iattr->ia_mtime.tv_sec);
376 READ32(iattr->ia_mtime.tv_nsec);
377 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
378 return nfserr_inval;
379 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
380 break;
381 case NFS4_SET_TO_SERVER_TIME:
382 iattr->ia_valid |= ATTR_MTIME;
383 break;
384 default:
385 goto xdr_error;
386 }
387 }
388 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
389 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
390 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
391 READ_BUF(expected_len - len);
392 else if (len != expected_len)
393 goto xdr_error;
394
395 DECODE_TAIL;
396
397out_nfserr:
398 status = nfserrno(host_err);
399 goto out;
400}
401
402static __be32
403nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
404{
405 DECODE_HEAD;
406
407 READ_BUF(sizeof(stateid_t));
408 READ32(sid->si_generation);
409 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
410
411 DECODE_TAIL;
412}
413
414static __be32
415nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
416{
417 DECODE_HEAD;
418
419 READ_BUF(4);
420 READ32(access->ac_req_access);
421
422 DECODE_TAIL;
423}
424
425static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
426{
427 DECODE_HEAD;
428
429 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
430 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
431 READ32(bcts->dir);
432 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
433 * could help us figure out we should be using it. */
434 DECODE_TAIL;
435}
436
437static __be32
438nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
439{
440 DECODE_HEAD;
441
442 READ_BUF(4);
443 READ32(close->cl_seqid);
444 return nfsd4_decode_stateid(argp, &close->cl_stateid);
445
446 DECODE_TAIL;
447}
448
449
450static __be32
451nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
452{
453 DECODE_HEAD;
454
455 READ_BUF(12);
456 READ64(commit->co_offset);
457 READ32(commit->co_count);
458
459 DECODE_TAIL;
460}
461
462static __be32
463nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
464{
465 DECODE_HEAD;
466
467 READ_BUF(4);
468 READ32(create->cr_type);
469 switch (create->cr_type) {
470 case NF4LNK:
471 READ_BUF(4);
472 READ32(create->cr_linklen);
473 READ_BUF(create->cr_linklen);
474 SAVEMEM(create->cr_linkname, create->cr_linklen);
475 break;
476 case NF4BLK:
477 case NF4CHR:
478 READ_BUF(8);
479 READ32(create->cr_specdata1);
480 READ32(create->cr_specdata2);
481 break;
482 case NF4SOCK:
483 case NF4FIFO:
484 case NF4DIR:
485 default:
486 break;
487 }
488
489 READ_BUF(4);
490 READ32(create->cr_namelen);
491 READ_BUF(create->cr_namelen);
492 SAVEMEM(create->cr_name, create->cr_namelen);
493 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
494 return status;
495
496 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
497 &create->cr_acl);
498 if (status)
499 goto out;
500
501 DECODE_TAIL;
502}
503
504static inline __be32
505nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
506{
507 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
508}
509
510static inline __be32
511nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
512{
513 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
514}
515
516static __be32
517nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
518{
519 DECODE_HEAD;
520
521 READ_BUF(4);
522 READ32(link->li_namelen);
523 READ_BUF(link->li_namelen);
524 SAVEMEM(link->li_name, link->li_namelen);
525 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
526 return status;
527
528 DECODE_TAIL;
529}
530
531static __be32
532nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
533{
534 DECODE_HEAD;
535
536 /*
537 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
538 */
539 READ_BUF(28);
540 READ32(lock->lk_type);
541 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
542 goto xdr_error;
543 READ32(lock->lk_reclaim);
544 READ64(lock->lk_offset);
545 READ64(lock->lk_length);
546 READ32(lock->lk_is_new);
547
548 if (lock->lk_is_new) {
549 READ_BUF(4);
550 READ32(lock->lk_new_open_seqid);
551 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
552 if (status)
553 return status;
554 READ_BUF(8 + sizeof(clientid_t));
555 READ32(lock->lk_new_lock_seqid);
556 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
557 READ32(lock->lk_new_owner.len);
558 READ_BUF(lock->lk_new_owner.len);
559 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
560 } else {
561 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
562 if (status)
563 return status;
564 READ_BUF(4);
565 READ32(lock->lk_old_lock_seqid);
566 }
567
568 DECODE_TAIL;
569}
570
571static __be32
572nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
573{
574 DECODE_HEAD;
575
576 READ_BUF(32);
577 READ32(lockt->lt_type);
578 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
579 goto xdr_error;
580 READ64(lockt->lt_offset);
581 READ64(lockt->lt_length);
582 COPYMEM(&lockt->lt_clientid, 8);
583 READ32(lockt->lt_owner.len);
584 READ_BUF(lockt->lt_owner.len);
585 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
586
587 DECODE_TAIL;
588}
589
590static __be32
591nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
592{
593 DECODE_HEAD;
594
595 READ_BUF(8);
596 READ32(locku->lu_type);
597 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
598 goto xdr_error;
599 READ32(locku->lu_seqid);
600 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
601 if (status)
602 return status;
603 READ_BUF(16);
604 READ64(locku->lu_offset);
605 READ64(locku->lu_length);
606
607 DECODE_TAIL;
608}
609
610static __be32
611nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
612{
613 DECODE_HEAD;
614
615 READ_BUF(4);
616 READ32(lookup->lo_len);
617 READ_BUF(lookup->lo_len);
618 SAVEMEM(lookup->lo_name, lookup->lo_len);
619 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
620 return status;
621
622 DECODE_TAIL;
623}
624
625static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
626{
627 __be32 *p;
628 u32 w;
629
630 READ_BUF(4);
631 READ32(w);
632 *share_access = w & NFS4_SHARE_ACCESS_MASK;
633 *deleg_want = w & NFS4_SHARE_WANT_MASK;
634 if (deleg_when)
635 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
636
637 switch (w & NFS4_SHARE_ACCESS_MASK) {
638 case NFS4_SHARE_ACCESS_READ:
639 case NFS4_SHARE_ACCESS_WRITE:
640 case NFS4_SHARE_ACCESS_BOTH:
641 break;
642 default:
643 return nfserr_bad_xdr;
644 }
645 w &= ~NFS4_SHARE_ACCESS_MASK;
646 if (!w)
647 return nfs_ok;
648 if (!argp->minorversion)
649 return nfserr_bad_xdr;
650 switch (w & NFS4_SHARE_WANT_MASK) {
651 case NFS4_SHARE_WANT_NO_PREFERENCE:
652 case NFS4_SHARE_WANT_READ_DELEG:
653 case NFS4_SHARE_WANT_WRITE_DELEG:
654 case NFS4_SHARE_WANT_ANY_DELEG:
655 case NFS4_SHARE_WANT_NO_DELEG:
656 case NFS4_SHARE_WANT_CANCEL:
657 break;
658 default:
659 return nfserr_bad_xdr;
660 }
661 w &= ~NFS4_SHARE_WANT_MASK;
662 if (!w)
663 return nfs_ok;
664
665 if (!deleg_when) /* open_downgrade */
666 return nfserr_inval;
667 switch (w) {
668 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
669 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
670 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
671 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
672 return nfs_ok;
673 }
674xdr_error:
675 return nfserr_bad_xdr;
676}
677
678static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
679{
680 __be32 *p;
681
682 READ_BUF(4);
683 READ32(*x);
684 /* Note: unlinke access bits, deny bits may be zero. */
685 if (*x & ~NFS4_SHARE_DENY_BOTH)
686 return nfserr_bad_xdr;
687 return nfs_ok;
688xdr_error:
689 return nfserr_bad_xdr;
690}
691
692static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
693{
694 __be32 *p;
695
696 READ_BUF(4);
697 READ32(o->len);
698
699 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
700 return nfserr_bad_xdr;
701
702 READ_BUF(o->len);
703 SAVEMEM(o->data, o->len);
704 return nfs_ok;
705xdr_error:
706 return nfserr_bad_xdr;
707}
708
709static __be32
710nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
711{
712 DECODE_HEAD;
713 u32 dummy;
714
715 memset(open->op_bmval, 0, sizeof(open->op_bmval));
716 open->op_iattr.ia_valid = 0;
717 open->op_openowner = NULL;
718
719 /* seqid, share_access, share_deny, clientid, ownerlen */
720 READ_BUF(4);
721 READ32(open->op_seqid);
722 /* decode, yet ignore deleg_when until supported */
723 status = nfsd4_decode_share_access(argp, &open->op_share_access,
724 &open->op_deleg_want, &dummy);
725 if (status)
726 goto xdr_error;
727 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
728 if (status)
729 goto xdr_error;
730 READ_BUF(sizeof(clientid_t));
731 COPYMEM(&open->op_clientid, sizeof(clientid_t));
732 status = nfsd4_decode_opaque(argp, &open->op_owner);
733 if (status)
734 goto xdr_error;
735 READ_BUF(4);
736 READ32(open->op_create);
737 switch (open->op_create) {
738 case NFS4_OPEN_NOCREATE:
739 break;
740 case NFS4_OPEN_CREATE:
741 READ_BUF(4);
742 READ32(open->op_createmode);
743 switch (open->op_createmode) {
744 case NFS4_CREATE_UNCHECKED:
745 case NFS4_CREATE_GUARDED:
746 status = nfsd4_decode_fattr(argp, open->op_bmval,
747 &open->op_iattr, &open->op_acl);
748 if (status)
749 goto out;
750 break;
751 case NFS4_CREATE_EXCLUSIVE:
752 READ_BUF(NFS4_VERIFIER_SIZE);
753 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
754 break;
755 case NFS4_CREATE_EXCLUSIVE4_1:
756 if (argp->minorversion < 1)
757 goto xdr_error;
758 READ_BUF(NFS4_VERIFIER_SIZE);
759 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
760 status = nfsd4_decode_fattr(argp, open->op_bmval,
761 &open->op_iattr, &open->op_acl);
762 if (status)
763 goto out;
764 break;
765 default:
766 goto xdr_error;
767 }
768 break;
769 default:
770 goto xdr_error;
771 }
772
773 /* open_claim */
774 READ_BUF(4);
775 READ32(open->op_claim_type);
776 switch (open->op_claim_type) {
777 case NFS4_OPEN_CLAIM_NULL:
778 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
779 READ_BUF(4);
780 READ32(open->op_fname.len);
781 READ_BUF(open->op_fname.len);
782 SAVEMEM(open->op_fname.data, open->op_fname.len);
783 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
784 return status;
785 break;
786 case NFS4_OPEN_CLAIM_PREVIOUS:
787 READ_BUF(4);
788 READ32(open->op_delegate_type);
789 break;
790 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
791 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
792 if (status)
793 return status;
794 READ_BUF(4);
795 READ32(open->op_fname.len);
796 READ_BUF(open->op_fname.len);
797 SAVEMEM(open->op_fname.data, open->op_fname.len);
798 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
799 return status;
800 break;
801 case NFS4_OPEN_CLAIM_FH:
802 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
803 if (argp->minorversion < 1)
804 goto xdr_error;
805 /* void */
806 break;
807 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
808 if (argp->minorversion < 1)
809 goto xdr_error;
810 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
811 if (status)
812 return status;
813 break;
814 default:
815 goto xdr_error;
816 }
817
818 DECODE_TAIL;
819}
820
821static __be32
822nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
823{
824 DECODE_HEAD;
825
826 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
827 if (status)
828 return status;
829 READ_BUF(4);
830 READ32(open_conf->oc_seqid);
831
832 DECODE_TAIL;
833}
834
835static __be32
836nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
837{
838 DECODE_HEAD;
839
840 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
841 if (status)
842 return status;
843 READ_BUF(4);
844 READ32(open_down->od_seqid);
845 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
846 &open_down->od_deleg_want, NULL);
847 if (status)
848 return status;
849 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
850 if (status)
851 return status;
852 DECODE_TAIL;
853}
854
855static __be32
856nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
857{
858 DECODE_HEAD;
859
860 READ_BUF(4);
861 READ32(putfh->pf_fhlen);
862 if (putfh->pf_fhlen > NFS4_FHSIZE)
863 goto xdr_error;
864 READ_BUF(putfh->pf_fhlen);
865 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
866
867 DECODE_TAIL;
868}
869
870static __be32
871nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
872{
873 DECODE_HEAD;
874
875 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
876 if (status)
877 return status;
878 READ_BUF(12);
879 READ64(read->rd_offset);
880 READ32(read->rd_length);
881
882 DECODE_TAIL;
883}
884
885static __be32
886nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
887{
888 DECODE_HEAD;
889
890 READ_BUF(24);
891 READ64(readdir->rd_cookie);
892 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
893 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
894 READ32(readdir->rd_maxcount);
895 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
896 goto out;
897
898 DECODE_TAIL;
899}
900
901static __be32
902nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
903{
904 DECODE_HEAD;
905
906 READ_BUF(4);
907 READ32(remove->rm_namelen);
908 READ_BUF(remove->rm_namelen);
909 SAVEMEM(remove->rm_name, remove->rm_namelen);
910 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
911 return status;
912
913 DECODE_TAIL;
914}
915
916static __be32
917nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
918{
919 DECODE_HEAD;
920
921 READ_BUF(4);
922 READ32(rename->rn_snamelen);
923 READ_BUF(rename->rn_snamelen + 4);
924 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
925 READ32(rename->rn_tnamelen);
926 READ_BUF(rename->rn_tnamelen);
927 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
928 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
929 return status;
930 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
931 return status;
932
933 DECODE_TAIL;
934}
935
936static __be32
937nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
938{
939 DECODE_HEAD;
940
941 READ_BUF(sizeof(clientid_t));
942 COPYMEM(clientid, sizeof(clientid_t));
943
944 DECODE_TAIL;
945}
946
947static __be32
948nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
949 struct nfsd4_secinfo *secinfo)
950{
951 DECODE_HEAD;
952
953 READ_BUF(4);
954 READ32(secinfo->si_namelen);
955 READ_BUF(secinfo->si_namelen);
956 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
957 status = check_filename(secinfo->si_name, secinfo->si_namelen,
958 nfserr_noent);
959 if (status)
960 return status;
961 DECODE_TAIL;
962}
963
964static __be32
965nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
966 struct nfsd4_secinfo_no_name *sin)
967{
968 DECODE_HEAD;
969
970 READ_BUF(4);
971 READ32(sin->sin_style);
972 DECODE_TAIL;
973}
974
975static __be32
976nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
977{
978 __be32 status;
979
980 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
981 if (status)
982 return status;
983 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
984 &setattr->sa_acl);
985}
986
987static __be32
988nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
989{
990 DECODE_HEAD;
991
992 READ_BUF(NFS4_VERIFIER_SIZE);
993 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
994
995 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
996 if (status)
997 return nfserr_bad_xdr;
998 READ_BUF(8);
999 READ32(setclientid->se_callback_prog);
1000 READ32(setclientid->se_callback_netid_len);
1001
1002 READ_BUF(setclientid->se_callback_netid_len + 4);
1003 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1004 READ32(setclientid->se_callback_addr_len);
1005
1006 READ_BUF(setclientid->se_callback_addr_len + 4);
1007 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1008 READ32(setclientid->se_callback_ident);
1009
1010 DECODE_TAIL;
1011}
1012
1013static __be32
1014nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1015{
1016 DECODE_HEAD;
1017
1018 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1019 COPYMEM(&scd_c->sc_clientid, 8);
1020 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1021
1022 DECODE_TAIL;
1023}
1024
1025/* Also used for NVERIFY */
1026static __be32
1027nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1028{
1029#if 0
1030 struct nfsd4_compoundargs save = {
1031 .p = argp->p,
1032 .end = argp->end,
1033 .rqstp = argp->rqstp,
1034 };
1035 u32 ve_bmval[2];
1036 struct iattr ve_iattr; /* request */
1037 struct nfs4_acl *ve_acl; /* request */
1038#endif
1039 DECODE_HEAD;
1040
1041 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1042 goto out;
1043
1044 /* For convenience's sake, we compare raw xdr'd attributes in
1045 * nfsd4_proc_verify; however we still decode here just to return
1046 * correct error in case of bad xdr. */
1047#if 0
1048 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1049 if (status == nfserr_inval) {
1050 status = nfserrno(status);
1051 goto out;
1052 }
1053#endif
1054 READ_BUF(4);
1055 READ32(verify->ve_attrlen);
1056 READ_BUF(verify->ve_attrlen);
1057 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1058
1059 DECODE_TAIL;
1060}
1061
1062static __be32
1063nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1064{
1065 int avail;
1066 int v;
1067 int len;
1068 DECODE_HEAD;
1069
1070 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1071 if (status)
1072 return status;
1073 READ_BUF(16);
1074 READ64(write->wr_offset);
1075 READ32(write->wr_stable_how);
1076 if (write->wr_stable_how > 2)
1077 goto xdr_error;
1078 READ32(write->wr_buflen);
1079
1080 /* Sorry .. no magic macros for this.. *
1081 * READ_BUF(write->wr_buflen);
1082 * SAVEMEM(write->wr_buf, write->wr_buflen);
1083 */
1084 avail = (char*)argp->end - (char*)argp->p;
1085 if (avail + argp->pagelen < write->wr_buflen) {
1086 dprintk("NFSD: xdr error (%s:%d)\n",
1087 __FILE__, __LINE__);
1088 goto xdr_error;
1089 }
1090 argp->rqstp->rq_vec[0].iov_base = p;
1091 argp->rqstp->rq_vec[0].iov_len = avail;
1092 v = 0;
1093 len = write->wr_buflen;
1094 while (len > argp->rqstp->rq_vec[v].iov_len) {
1095 len -= argp->rqstp->rq_vec[v].iov_len;
1096 v++;
1097 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1098 argp->pagelist++;
1099 if (argp->pagelen >= PAGE_SIZE) {
1100 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1101 argp->pagelen -= PAGE_SIZE;
1102 } else {
1103 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1104 argp->pagelen -= len;
1105 }
1106 }
1107 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1108 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1109 argp->rqstp->rq_vec[v].iov_len = len;
1110 write->wr_vlen = v+1;
1111
1112 DECODE_TAIL;
1113}
1114
1115static __be32
1116nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1117{
1118 DECODE_HEAD;
1119
1120 READ_BUF(12);
1121 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1122 READ32(rlockowner->rl_owner.len);
1123 READ_BUF(rlockowner->rl_owner.len);
1124 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1125
1126 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1127 return nfserr_inval;
1128 DECODE_TAIL;
1129}
1130
1131static __be32
1132nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1133 struct nfsd4_exchange_id *exid)
1134{
1135 int dummy, tmp;
1136 DECODE_HEAD;
1137
1138 READ_BUF(NFS4_VERIFIER_SIZE);
1139 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1140
1141 status = nfsd4_decode_opaque(argp, &exid->clname);
1142 if (status)
1143 return nfserr_bad_xdr;
1144
1145 READ_BUF(4);
1146 READ32(exid->flags);
1147
1148 /* Ignore state_protect4_a */
1149 READ_BUF(4);
1150 READ32(exid->spa_how);
1151 switch (exid->spa_how) {
1152 case SP4_NONE:
1153 break;
1154 case SP4_MACH_CRED:
1155 /* spo_must_enforce */
1156 READ_BUF(4);
1157 READ32(dummy);
1158 READ_BUF(dummy * 4);
1159 p += dummy;
1160
1161 /* spo_must_allow */
1162 READ_BUF(4);
1163 READ32(dummy);
1164 READ_BUF(dummy * 4);
1165 p += dummy;
1166 break;
1167 case SP4_SSV:
1168 /* ssp_ops */
1169 READ_BUF(4);
1170 READ32(dummy);
1171 READ_BUF(dummy * 4);
1172 p += dummy;
1173
1174 READ_BUF(4);
1175 READ32(dummy);
1176 READ_BUF(dummy * 4);
1177 p += dummy;
1178
1179 /* ssp_hash_algs<> */
1180 READ_BUF(4);
1181 READ32(tmp);
1182 while (tmp--) {
1183 READ_BUF(4);
1184 READ32(dummy);
1185 READ_BUF(dummy);
1186 p += XDR_QUADLEN(dummy);
1187 }
1188
1189 /* ssp_encr_algs<> */
1190 READ_BUF(4);
1191 READ32(tmp);
1192 while (tmp--) {
1193 READ_BUF(4);
1194 READ32(dummy);
1195 READ_BUF(dummy);
1196 p += XDR_QUADLEN(dummy);
1197 }
1198
1199 /* ssp_window and ssp_num_gss_handles */
1200 READ_BUF(8);
1201 READ32(dummy);
1202 READ32(dummy);
1203 break;
1204 default:
1205 goto xdr_error;
1206 }
1207
1208 /* Ignore Implementation ID */
1209 READ_BUF(4); /* nfs_impl_id4 array length */
1210 READ32(dummy);
1211
1212 if (dummy > 1)
1213 goto xdr_error;
1214
1215 if (dummy == 1) {
1216 /* nii_domain */
1217 READ_BUF(4);
1218 READ32(dummy);
1219 READ_BUF(dummy);
1220 p += XDR_QUADLEN(dummy);
1221
1222 /* nii_name */
1223 READ_BUF(4);
1224 READ32(dummy);
1225 READ_BUF(dummy);
1226 p += XDR_QUADLEN(dummy);
1227
1228 /* nii_date */
1229 READ_BUF(12);
1230 p += 3;
1231 }
1232 DECODE_TAIL;
1233}
1234
1235static __be32
1236nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1237 struct nfsd4_create_session *sess)
1238{
1239 DECODE_HEAD;
1240
1241 u32 dummy;
1242 char *machine_name;
1243 int i;
1244 int nr_secflavs;
1245
1246 READ_BUF(16);
1247 COPYMEM(&sess->clientid, 8);
1248 READ32(sess->seqid);
1249 READ32(sess->flags);
1250
1251 /* Fore channel attrs */
1252 READ_BUF(28);
1253 READ32(dummy); /* headerpadsz is always 0 */
1254 READ32(sess->fore_channel.maxreq_sz);
1255 READ32(sess->fore_channel.maxresp_sz);
1256 READ32(sess->fore_channel.maxresp_cached);
1257 READ32(sess->fore_channel.maxops);
1258 READ32(sess->fore_channel.maxreqs);
1259 READ32(sess->fore_channel.nr_rdma_attrs);
1260 if (sess->fore_channel.nr_rdma_attrs == 1) {
1261 READ_BUF(4);
1262 READ32(sess->fore_channel.rdma_attrs);
1263 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1264 dprintk("Too many fore channel attr bitmaps!\n");
1265 goto xdr_error;
1266 }
1267
1268 /* Back channel attrs */
1269 READ_BUF(28);
1270 READ32(dummy); /* headerpadsz is always 0 */
1271 READ32(sess->back_channel.maxreq_sz);
1272 READ32(sess->back_channel.maxresp_sz);
1273 READ32(sess->back_channel.maxresp_cached);
1274 READ32(sess->back_channel.maxops);
1275 READ32(sess->back_channel.maxreqs);
1276 READ32(sess->back_channel.nr_rdma_attrs);
1277 if (sess->back_channel.nr_rdma_attrs == 1) {
1278 READ_BUF(4);
1279 READ32(sess->back_channel.rdma_attrs);
1280 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1281 dprintk("Too many back channel attr bitmaps!\n");
1282 goto xdr_error;
1283 }
1284
1285 READ_BUF(8);
1286 READ32(sess->callback_prog);
1287
1288 /* callback_sec_params4 */
1289 READ32(nr_secflavs);
1290 for (i = 0; i < nr_secflavs; ++i) {
1291 READ_BUF(4);
1292 READ32(dummy);
1293 switch (dummy) {
1294 case RPC_AUTH_NULL:
1295 /* Nothing to read */
1296 break;
1297 case RPC_AUTH_UNIX:
1298 READ_BUF(8);
1299 /* stamp */
1300 READ32(dummy);
1301
1302 /* machine name */
1303 READ32(dummy);
1304 READ_BUF(dummy);
1305 SAVEMEM(machine_name, dummy);
1306
1307 /* uid, gid */
1308 READ_BUF(8);
1309 READ32(sess->uid);
1310 READ32(sess->gid);
1311
1312 /* more gids */
1313 READ_BUF(4);
1314 READ32(dummy);
1315 READ_BUF(dummy * 4);
1316 break;
1317 case RPC_AUTH_GSS:
1318 dprintk("RPC_AUTH_GSS callback secflavor "
1319 "not supported!\n");
1320 READ_BUF(8);
1321 /* gcbp_service */
1322 READ32(dummy);
1323 /* gcbp_handle_from_server */
1324 READ32(dummy);
1325 READ_BUF(dummy);
1326 p += XDR_QUADLEN(dummy);
1327 /* gcbp_handle_from_client */
1328 READ_BUF(4);
1329 READ32(dummy);
1330 READ_BUF(dummy);
1331 break;
1332 default:
1333 dprintk("Illegal callback secflavor\n");
1334 return nfserr_inval;
1335 }
1336 }
1337 DECODE_TAIL;
1338}
1339
1340static __be32
1341nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1342 struct nfsd4_destroy_session *destroy_session)
1343{
1344 DECODE_HEAD;
1345 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1346 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1347
1348 DECODE_TAIL;
1349}
1350
1351static __be32
1352nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1353 struct nfsd4_free_stateid *free_stateid)
1354{
1355 DECODE_HEAD;
1356
1357 READ_BUF(sizeof(stateid_t));
1358 READ32(free_stateid->fr_stateid.si_generation);
1359 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1360
1361 DECODE_TAIL;
1362}
1363
1364static __be32
1365nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1366 struct nfsd4_sequence *seq)
1367{
1368 DECODE_HEAD;
1369
1370 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1371 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1372 READ32(seq->seqid);
1373 READ32(seq->slotid);
1374 READ32(seq->maxslots);
1375 READ32(seq->cachethis);
1376
1377 DECODE_TAIL;
1378}
1379
1380static __be32
1381nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1382{
1383 int i;
1384 __be32 *p, status;
1385 struct nfsd4_test_stateid_id *stateid;
1386
1387 READ_BUF(4);
1388 test_stateid->ts_num_ids = ntohl(*p++);
1389
1390 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1391
1392 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1393 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1394 if (!stateid) {
1395 status = nfserrno(-ENOMEM);
1396 goto out;
1397 }
1398
1399 defer_free(argp, kfree, stateid);
1400 INIT_LIST_HEAD(&stateid->ts_id_list);
1401 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1402
1403 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1404 if (status)
1405 goto out;
1406 }
1407
1408 status = 0;
1409out:
1410 return status;
1411xdr_error:
1412 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1413 status = nfserr_bad_xdr;
1414 goto out;
1415}
1416
1417static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1418{
1419 DECODE_HEAD;
1420
1421 READ_BUF(8);
1422 COPYMEM(&dc->clientid, 8);
1423
1424 DECODE_TAIL;
1425}
1426
1427static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1428{
1429 DECODE_HEAD;
1430
1431 READ_BUF(4);
1432 READ32(rc->rca_one_fs);
1433
1434 DECODE_TAIL;
1435}
1436
1437static __be32
1438nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1439{
1440 return nfs_ok;
1441}
1442
1443static __be32
1444nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1445{
1446 return nfserr_notsupp;
1447}
1448
1449typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1450
1451static nfsd4_dec nfsd4_dec_ops[] = {
1452 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1453 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1454 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1455 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1456 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1457 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1458 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1459 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1460 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1461 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1462 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1463 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1464 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1465 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1466 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1467 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1468 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1469 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1470 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1471 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1472 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_noop,
1473 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1474 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1475 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1476 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1477 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1478 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1479 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1480 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1481 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1482 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1483 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1484 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1485 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1486 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1487 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1488 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1489};
1490
1491static nfsd4_dec nfsd41_dec_ops[] = {
1492 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1493 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1494 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1495 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1496 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1497 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1498 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1499 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1500 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1501 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1502 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1503 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1504 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1505 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1506 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1507 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1508 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1509 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_notsupp,
1510 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1511 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1512 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1513 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1514 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1515 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1516 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1517 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1518 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1519 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_notsupp,
1520 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1521 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1522 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1523 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1524 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1525 [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1526 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1527 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1528 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp,
1529
1530 /* new operations for NFSv4.1 */
1531 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp,
1532 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1533 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1534 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1535 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1536 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1537 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1538 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1539 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1540 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1541 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1542 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1543 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1544 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1545 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1546 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1547 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1548 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1549 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1550};
1551
1552struct nfsd4_minorversion_ops {
1553 nfsd4_dec *decoders;
1554 int nops;
1555};
1556
1557static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1558 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1559 [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1560};
1561
1562static __be32
1563nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1564{
1565 DECODE_HEAD;
1566 struct nfsd4_op *op;
1567 struct nfsd4_minorversion_ops *ops;
1568 bool cachethis = false;
1569 int i;
1570
1571 /*
1572 * XXX: According to spec, we should check the tag
1573 * for UTF-8 compliance. I'm postponing this for
1574 * now because it seems that some clients do use
1575 * binary tags.
1576 */
1577 READ_BUF(4);
1578 READ32(argp->taglen);
1579 READ_BUF(argp->taglen + 8);
1580 SAVEMEM(argp->tag, argp->taglen);
1581 READ32(argp->minorversion);
1582 READ32(argp->opcnt);
1583
1584 if (argp->taglen > NFSD4_MAX_TAGLEN)
1585 goto xdr_error;
1586 if (argp->opcnt > 100)
1587 goto xdr_error;
1588
1589 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1590 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1591 if (!argp->ops) {
1592 argp->ops = argp->iops;
1593 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1594 goto xdr_error;
1595 }
1596 }
1597
1598 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1599 argp->opcnt = 0;
1600
1601 ops = &nfsd4_minorversion[argp->minorversion];
1602 for (i = 0; i < argp->opcnt; i++) {
1603 op = &argp->ops[i];
1604 op->replay = NULL;
1605
1606 /*
1607 * We can't use READ_BUF() here because we need to handle
1608 * a missing opcode as an OP_WRITE + 1. So we need to check
1609 * to see if we're truly at the end of our buffer or if there
1610 * is another page we need to flip to.
1611 */
1612
1613 if (argp->p == argp->end) {
1614 if (argp->pagelen < 4) {
1615 /* There isn't an opcode still on the wire */
1616 op->opnum = OP_WRITE + 1;
1617 op->status = nfserr_bad_xdr;
1618 argp->opcnt = i+1;
1619 break;
1620 }
1621
1622 /*
1623 * False alarm. We just hit a page boundary, but there
1624 * is still data available. Move pointer across page
1625 * boundary. *snip from READ_BUF*
1626 */
1627 argp->p = page_address(argp->pagelist[0]);
1628 argp->pagelist++;
1629 if (argp->pagelen < PAGE_SIZE) {
1630 argp->end = argp->p + (argp->pagelen>>2);
1631 argp->pagelen = 0;
1632 } else {
1633 argp->end = argp->p + (PAGE_SIZE>>2);
1634 argp->pagelen -= PAGE_SIZE;
1635 }
1636 }
1637 op->opnum = ntohl(*argp->p++);
1638
1639 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1640 op->status = ops->decoders[op->opnum](argp, &op->u);
1641 else {
1642 op->opnum = OP_ILLEGAL;
1643 op->status = nfserr_op_illegal;
1644 }
1645
1646 if (op->status) {
1647 argp->opcnt = i+1;
1648 break;
1649 }
1650 /*
1651 * We'll try to cache the result in the DRC if any one
1652 * op in the compound wants to be cached:
1653 */
1654 cachethis |= nfsd4_cache_this_op(op);
1655 }
1656 /* Sessions make the DRC unnecessary: */
1657 if (argp->minorversion)
1658 cachethis = false;
1659 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1660
1661 DECODE_TAIL;
1662}
1663
1664#define WRITE32(n) *p++ = htonl(n)
1665#define WRITE64(n) do { \
1666 *p++ = htonl((u32)((n) >> 32)); \
1667 *p++ = htonl((u32)(n)); \
1668} while (0)
1669#define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1670 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1671 memcpy(p, ptr, nbytes); \
1672 p += XDR_QUADLEN(nbytes); \
1673}} while (0)
1674
1675static void write32(__be32 **p, u32 n)
1676{
1677 *(*p)++ = htonl(n);
1678}
1679
1680static void write64(__be32 **p, u64 n)
1681{
1682 write32(p, (n >> 32));
1683 write32(p, (u32)n);
1684}
1685
1686static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1687{
1688 if (IS_I_VERSION(inode)) {
1689 write64(p, inode->i_version);
1690 } else {
1691 write32(p, stat->ctime.tv_sec);
1692 write32(p, stat->ctime.tv_nsec);
1693 }
1694}
1695
1696static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1697{
1698 write32(p, c->atomic);
1699 if (c->change_supported) {
1700 write64(p, c->before_change);
1701 write64(p, c->after_change);
1702 } else {
1703 write32(p, c->before_ctime_sec);
1704 write32(p, c->before_ctime_nsec);
1705 write32(p, c->after_ctime_sec);
1706 write32(p, c->after_ctime_nsec);
1707 }
1708}
1709
1710#define RESERVE_SPACE(nbytes) do { \
1711 p = resp->p; \
1712 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1713} while (0)
1714#define ADJUST_ARGS() resp->p = p
1715
1716/*
1717 * Header routine to setup seqid operation replay cache
1718 */
1719#define ENCODE_SEQID_OP_HEAD \
1720 __be32 *save; \
1721 \
1722 save = resp->p;
1723
1724/*
1725 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1726 * is where sequence id's are incremented, and the replay cache is filled.
1727 * Note that we increment sequence id's here, at the last moment, so we're sure
1728 * we know whether the error to be returned is a sequence id mutating error.
1729 */
1730
1731static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1732{
1733 struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1734
1735 if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1736 stateowner->so_seqid++;
1737 stateowner->so_replay.rp_status = nfserr;
1738 stateowner->so_replay.rp_buflen =
1739 (char *)resp->p - (char *)save;
1740 memcpy(stateowner->so_replay.rp_buf, save,
1741 stateowner->so_replay.rp_buflen);
1742 nfsd4_purge_closed_stateid(stateowner);
1743 }
1744}
1745
1746/* Encode as an array of strings the string given with components
1747 * separated @sep, escaped with esc_enter and esc_exit.
1748 */
1749static __be32 nfsd4_encode_components_esc(char sep, char *components,
1750 __be32 **pp, int *buflen,
1751 char esc_enter, char esc_exit)
1752{
1753 __be32 *p = *pp;
1754 __be32 *countp = p;
1755 int strlen, count=0;
1756 char *str, *end, *next;
1757
1758 dprintk("nfsd4_encode_components(%s)\n", components);
1759 if ((*buflen -= 4) < 0)
1760 return nfserr_resource;
1761 WRITE32(0); /* We will fill this in with @count later */
1762 end = str = components;
1763 while (*end) {
1764 bool found_esc = false;
1765
1766 /* try to parse as esc_start, ..., esc_end, sep */
1767 if (*str == esc_enter) {
1768 for (; *end && (*end != esc_exit); end++)
1769 /* find esc_exit or end of string */;
1770 next = end + 1;
1771 if (*end && (!*next || *next == sep)) {
1772 str++;
1773 found_esc = true;
1774 }
1775 }
1776
1777 if (!found_esc)
1778 for (; *end && (*end != sep); end++)
1779 /* find sep or end of string */;
1780
1781 strlen = end - str;
1782 if (strlen) {
1783 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1784 return nfserr_resource;
1785 WRITE32(strlen);
1786 WRITEMEM(str, strlen);
1787 count++;
1788 }
1789 else
1790 end++;
1791 str = end;
1792 }
1793 *pp = p;
1794 p = countp;
1795 WRITE32(count);
1796 return 0;
1797}
1798
1799/* Encode as an array of strings the string given with components
1800 * separated @sep.
1801 */
1802static __be32 nfsd4_encode_components(char sep, char *components,
1803 __be32 **pp, int *buflen)
1804{
1805 return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1806}
1807
1808/*
1809 * encode a location element of a fs_locations structure
1810 */
1811static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1812 __be32 **pp, int *buflen)
1813{
1814 __be32 status;
1815 __be32 *p = *pp;
1816
1817 status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1818 '[', ']');
1819 if (status)
1820 return status;
1821 status = nfsd4_encode_components('/', location->path, &p, buflen);
1822 if (status)
1823 return status;
1824 *pp = p;
1825 return 0;
1826}
1827
1828/*
1829 * Encode a path in RFC3530 'pathname4' format
1830 */
1831static __be32 nfsd4_encode_path(const struct path *root,
1832 const struct path *path, __be32 **pp, int *buflen)
1833{
1834 struct path cur = {
1835 .mnt = path->mnt,
1836 .dentry = path->dentry,
1837 };
1838 __be32 *p = *pp;
1839 struct dentry **components = NULL;
1840 unsigned int ncomponents = 0;
1841 __be32 err = nfserr_jukebox;
1842
1843 dprintk("nfsd4_encode_components(");
1844
1845 path_get(&cur);
1846 /* First walk the path up to the nfsd root, and store the
1847 * dentries/path components in an array.
1848 */
1849 for (;;) {
1850 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1851 break;
1852 if (cur.dentry == cur.mnt->mnt_root) {
1853 if (follow_up(&cur))
1854 continue;
1855 goto out_free;
1856 }
1857 if ((ncomponents & 15) == 0) {
1858 struct dentry **new;
1859 new = krealloc(components,
1860 sizeof(*new) * (ncomponents + 16),
1861 GFP_KERNEL);
1862 if (!new)
1863 goto out_free;
1864 components = new;
1865 }
1866 components[ncomponents++] = cur.dentry;
1867 cur.dentry = dget_parent(cur.dentry);
1868 }
1869
1870 *buflen -= 4;
1871 if (*buflen < 0)
1872 goto out_free;
1873 WRITE32(ncomponents);
1874
1875 while (ncomponents) {
1876 struct dentry *dentry = components[ncomponents - 1];
1877 unsigned int len = dentry->d_name.len;
1878
1879 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1880 if (*buflen < 0)
1881 goto out_free;
1882 WRITE32(len);
1883 WRITEMEM(dentry->d_name.name, len);
1884 dprintk("/%s", dentry->d_name.name);
1885 dput(dentry);
1886 ncomponents--;
1887 }
1888
1889 *pp = p;
1890 err = 0;
1891out_free:
1892 dprintk(")\n");
1893 while (ncomponents)
1894 dput(components[--ncomponents]);
1895 kfree(components);
1896 path_put(&cur);
1897 return err;
1898}
1899
1900static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1901 const struct path *path, __be32 **pp, int *buflen)
1902{
1903 struct svc_export *exp_ps;
1904 __be32 res;
1905
1906 exp_ps = rqst_find_fsidzero_export(rqstp);
1907 if (IS_ERR(exp_ps))
1908 return nfserrno(PTR_ERR(exp_ps));
1909 res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1910 exp_put(exp_ps);
1911 return res;
1912}
1913
1914/*
1915 * encode a fs_locations structure
1916 */
1917static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1918 struct svc_export *exp,
1919 __be32 **pp, int *buflen)
1920{
1921 __be32 status;
1922 int i;
1923 __be32 *p = *pp;
1924 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1925
1926 status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1927 if (status)
1928 return status;
1929 if ((*buflen -= 4) < 0)
1930 return nfserr_resource;
1931 WRITE32(fslocs->locations_count);
1932 for (i=0; i<fslocs->locations_count; i++) {
1933 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1934 &p, buflen);
1935 if (status)
1936 return status;
1937 }
1938 *pp = p;
1939 return 0;
1940}
1941
1942static u32 nfs4_file_type(umode_t mode)
1943{
1944 switch (mode & S_IFMT) {
1945 case S_IFIFO: return NF4FIFO;
1946 case S_IFCHR: return NF4CHR;
1947 case S_IFDIR: return NF4DIR;
1948 case S_IFBLK: return NF4BLK;
1949 case S_IFLNK: return NF4LNK;
1950 case S_IFREG: return NF4REG;
1951 case S_IFSOCK: return NF4SOCK;
1952 default: return NF4BAD;
1953 };
1954}
1955
1956static __be32
1957nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1958 __be32 **p, int *buflen)
1959{
1960 int status;
1961
1962 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1963 return nfserr_resource;
1964 if (whotype != NFS4_ACL_WHO_NAMED)
1965 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1966 else if (group)
1967 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1968 else
1969 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1970 if (status < 0)
1971 return nfserrno(status);
1972 *p = xdr_encode_opaque(*p, NULL, status);
1973 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1974 BUG_ON(*buflen < 0);
1975 return 0;
1976}
1977
1978static inline __be32
1979nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1980{
1981 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1982}
1983
1984static inline __be32
1985nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1986{
1987 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1988}
1989
1990static inline __be32
1991nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1992 __be32 **p, int *buflen)
1993{
1994 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1995}
1996
1997#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1998 FATTR4_WORD0_RDATTR_ERROR)
1999#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2000
2001static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2002{
2003 /* As per referral draft: */
2004 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2005 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2006 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2007 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2008 *rdattr_err = NFSERR_MOVED;
2009 else
2010 return nfserr_moved;
2011 }
2012 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2013 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2014 return 0;
2015}
2016
2017/*
2018 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2019 * ourselves.
2020 *
2021 * @countp is the buffer size in _words_; upon successful return this becomes
2022 * replaced with the number of words written.
2023 */
2024__be32
2025nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2026 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2027 struct svc_rqst *rqstp, int ignore_crossmnt)
2028{
2029 u32 bmval0 = bmval[0];
2030 u32 bmval1 = bmval[1];
2031 u32 bmval2 = bmval[2];
2032 struct kstat stat;
2033 struct svc_fh tempfh;
2034 struct kstatfs statfs;
2035 int buflen = *countp << 2;
2036 __be32 *attrlenp;
2037 u32 dummy;
2038 u64 dummy64;
2039 u32 rdattr_err = 0;
2040 __be32 *p = buffer;
2041 __be32 status;
2042 int err;
2043 int aclsupport = 0;
2044 struct nfs4_acl *acl = NULL;
2045 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2046 u32 minorversion = resp->cstate.minorversion;
2047 struct path path = {
2048 .mnt = exp->ex_path.mnt,
2049 .dentry = dentry,
2050 };
2051
2052 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2053 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2054 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2055 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2056
2057 if (exp->ex_fslocs.migrated) {
2058 BUG_ON(bmval[2]);
2059 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2060 if (status)
2061 goto out;
2062 }
2063
2064 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2065 if (err)
2066 goto out_nfserr;
2067 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2068 FATTR4_WORD0_MAXNAME)) ||
2069 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2070 FATTR4_WORD1_SPACE_TOTAL))) {
2071 err = vfs_statfs(&path, &statfs);
2072 if (err)
2073 goto out_nfserr;
2074 }
2075 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2076 fh_init(&tempfh, NFS4_FHSIZE);
2077 status = fh_compose(&tempfh, exp, dentry, NULL);
2078 if (status)
2079 goto out;
2080 fhp = &tempfh;
2081 }
2082 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2083 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2084 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2085 aclsupport = (err == 0);
2086 if (bmval0 & FATTR4_WORD0_ACL) {
2087 if (err == -EOPNOTSUPP)
2088 bmval0 &= ~FATTR4_WORD0_ACL;
2089 else if (err == -EINVAL) {
2090 status = nfserr_attrnotsupp;
2091 goto out;
2092 } else if (err != 0)
2093 goto out_nfserr;
2094 }
2095 }
2096
2097 if (bmval2) {
2098 if ((buflen -= 16) < 0)
2099 goto out_resource;
2100 WRITE32(3);
2101 WRITE32(bmval0);
2102 WRITE32(bmval1);
2103 WRITE32(bmval2);
2104 } else if (bmval1) {
2105 if ((buflen -= 12) < 0)
2106 goto out_resource;
2107 WRITE32(2);
2108 WRITE32(bmval0);
2109 WRITE32(bmval1);
2110 } else {
2111 if ((buflen -= 8) < 0)
2112 goto out_resource;
2113 WRITE32(1);
2114 WRITE32(bmval0);
2115 }
2116 attrlenp = p++; /* to be backfilled later */
2117
2118 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2119 u32 word0 = nfsd_suppattrs0(minorversion);
2120 u32 word1 = nfsd_suppattrs1(minorversion);
2121 u32 word2 = nfsd_suppattrs2(minorversion);
2122
2123 if (!aclsupport)
2124 word0 &= ~FATTR4_WORD0_ACL;
2125 if (!word2) {
2126 if ((buflen -= 12) < 0)
2127 goto out_resource;
2128 WRITE32(2);
2129 WRITE32(word0);
2130 WRITE32(word1);
2131 } else {
2132 if ((buflen -= 16) < 0)
2133 goto out_resource;
2134 WRITE32(3);
2135 WRITE32(word0);
2136 WRITE32(word1);
2137 WRITE32(word2);
2138 }
2139 }
2140 if (bmval0 & FATTR4_WORD0_TYPE) {
2141 if ((buflen -= 4) < 0)
2142 goto out_resource;
2143 dummy = nfs4_file_type(stat.mode);
2144 if (dummy == NF4BAD)
2145 goto out_serverfault;
2146 WRITE32(dummy);
2147 }
2148 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2149 if ((buflen -= 4) < 0)
2150 goto out_resource;
2151 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2152 WRITE32(NFS4_FH_PERSISTENT);
2153 else
2154 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2155 }
2156 if (bmval0 & FATTR4_WORD0_CHANGE) {
2157 if ((buflen -= 8) < 0)
2158 goto out_resource;
2159 write_change(&p, &stat, dentry->d_inode);
2160 }
2161 if (bmval0 & FATTR4_WORD0_SIZE) {
2162 if ((buflen -= 8) < 0)
2163 goto out_resource;
2164 WRITE64(stat.size);
2165 }
2166 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2167 if ((buflen -= 4) < 0)
2168 goto out_resource;
2169 WRITE32(1);
2170 }
2171 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2172 if ((buflen -= 4) < 0)
2173 goto out_resource;
2174 WRITE32(1);
2175 }
2176 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2177 if ((buflen -= 4) < 0)
2178 goto out_resource;
2179 WRITE32(0);
2180 }
2181 if (bmval0 & FATTR4_WORD0_FSID) {
2182 if ((buflen -= 16) < 0)
2183 goto out_resource;
2184 if (exp->ex_fslocs.migrated) {
2185 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2186 WRITE64(NFS4_REFERRAL_FSID_MINOR);
2187 } else switch(fsid_source(fhp)) {
2188 case FSIDSOURCE_FSID:
2189 WRITE64((u64)exp->ex_fsid);
2190 WRITE64((u64)0);
2191 break;
2192 case FSIDSOURCE_DEV:
2193 WRITE32(0);
2194 WRITE32(MAJOR(stat.dev));
2195 WRITE32(0);
2196 WRITE32(MINOR(stat.dev));
2197 break;
2198 case FSIDSOURCE_UUID:
2199 WRITEMEM(exp->ex_uuid, 16);
2200 break;
2201 }
2202 }
2203 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2204 if ((buflen -= 4) < 0)
2205 goto out_resource;
2206 WRITE32(0);
2207 }
2208 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2209 if ((buflen -= 4) < 0)
2210 goto out_resource;
2211 WRITE32(nfsd4_lease);
2212 }
2213 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2214 if ((buflen -= 4) < 0)
2215 goto out_resource;
2216 WRITE32(rdattr_err);
2217 }
2218 if (bmval0 & FATTR4_WORD0_ACL) {
2219 struct nfs4_ace *ace;
2220
2221 if (acl == NULL) {
2222 if ((buflen -= 4) < 0)
2223 goto out_resource;
2224
2225 WRITE32(0);
2226 goto out_acl;
2227 }
2228 if ((buflen -= 4) < 0)
2229 goto out_resource;
2230 WRITE32(acl->naces);
2231
2232 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2233 if ((buflen -= 4*3) < 0)
2234 goto out_resource;
2235 WRITE32(ace->type);
2236 WRITE32(ace->flag);
2237 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2238 status = nfsd4_encode_aclname(rqstp, ace->whotype,
2239 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2240 &p, &buflen);
2241 if (status == nfserr_resource)
2242 goto out_resource;
2243 if (status)
2244 goto out;
2245 }
2246 }
2247out_acl:
2248 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2249 if ((buflen -= 4) < 0)
2250 goto out_resource;
2251 WRITE32(aclsupport ?
2252 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2253 }
2254 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2255 if ((buflen -= 4) < 0)
2256 goto out_resource;
2257 WRITE32(1);
2258 }
2259 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2260 if ((buflen -= 4) < 0)
2261 goto out_resource;
2262 WRITE32(0);
2263 }
2264 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2265 if ((buflen -= 4) < 0)
2266 goto out_resource;
2267 WRITE32(1);
2268 }
2269 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2270 if ((buflen -= 4) < 0)
2271 goto out_resource;
2272 WRITE32(1);
2273 }
2274 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2275 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2276 if (buflen < 0)
2277 goto out_resource;
2278 WRITE32(fhp->fh_handle.fh_size);
2279 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2280 }
2281 if (bmval0 & FATTR4_WORD0_FILEID) {
2282 if ((buflen -= 8) < 0)
2283 goto out_resource;
2284 WRITE64(stat.ino);
2285 }
2286 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2287 if ((buflen -= 8) < 0)
2288 goto out_resource;
2289 WRITE64((u64) statfs.f_ffree);
2290 }
2291 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2292 if ((buflen -= 8) < 0)
2293 goto out_resource;
2294 WRITE64((u64) statfs.f_ffree);
2295 }
2296 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2297 if ((buflen -= 8) < 0)
2298 goto out_resource;
2299 WRITE64((u64) statfs.f_files);
2300 }
2301 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2302 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2303 if (status == nfserr_resource)
2304 goto out_resource;
2305 if (status)
2306 goto out;
2307 }
2308 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2309 if ((buflen -= 4) < 0)
2310 goto out_resource;
2311 WRITE32(1);
2312 }
2313 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2314 if ((buflen -= 8) < 0)
2315 goto out_resource;
2316 WRITE64(~(u64)0);
2317 }
2318 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2319 if ((buflen -= 4) < 0)
2320 goto out_resource;
2321 WRITE32(255);
2322 }
2323 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2324 if ((buflen -= 4) < 0)
2325 goto out_resource;
2326 WRITE32(statfs.f_namelen);
2327 }
2328 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2329 if ((buflen -= 8) < 0)
2330 goto out_resource;
2331 WRITE64((u64) svc_max_payload(rqstp));
2332 }
2333 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2334 if ((buflen -= 8) < 0)
2335 goto out_resource;
2336 WRITE64((u64) svc_max_payload(rqstp));
2337 }
2338 if (bmval1 & FATTR4_WORD1_MODE) {
2339 if ((buflen -= 4) < 0)
2340 goto out_resource;
2341 WRITE32(stat.mode & S_IALLUGO);
2342 }
2343 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2344 if ((buflen -= 4) < 0)
2345 goto out_resource;
2346 WRITE32(1);
2347 }
2348 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2349 if ((buflen -= 4) < 0)
2350 goto out_resource;
2351 WRITE32(stat.nlink);
2352 }
2353 if (bmval1 & FATTR4_WORD1_OWNER) {
2354 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2355 if (status == nfserr_resource)
2356 goto out_resource;
2357 if (status)
2358 goto out;
2359 }
2360 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2361 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2362 if (status == nfserr_resource)
2363 goto out_resource;
2364 if (status)
2365 goto out;
2366 }
2367 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2368 if ((buflen -= 8) < 0)
2369 goto out_resource;
2370 WRITE32((u32) MAJOR(stat.rdev));
2371 WRITE32((u32) MINOR(stat.rdev));
2372 }
2373 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2374 if ((buflen -= 8) < 0)
2375 goto out_resource;
2376 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2377 WRITE64(dummy64);
2378 }
2379 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2380 if ((buflen -= 8) < 0)
2381 goto out_resource;
2382 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2383 WRITE64(dummy64);
2384 }
2385 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2386 if ((buflen -= 8) < 0)
2387 goto out_resource;
2388 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2389 WRITE64(dummy64);
2390 }
2391 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2392 if ((buflen -= 8) < 0)
2393 goto out_resource;
2394 dummy64 = (u64)stat.blocks << 9;
2395 WRITE64(dummy64);
2396 }
2397 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2398 if ((buflen -= 12) < 0)
2399 goto out_resource;
2400 WRITE32(0);
2401 WRITE32(stat.atime.tv_sec);
2402 WRITE32(stat.atime.tv_nsec);
2403 }
2404 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2405 if ((buflen -= 12) < 0)
2406 goto out_resource;
2407 WRITE32(0);
2408 WRITE32(1);
2409 WRITE32(0);
2410 }
2411 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2412 if ((buflen -= 12) < 0)
2413 goto out_resource;
2414 WRITE32(0);
2415 WRITE32(stat.ctime.tv_sec);
2416 WRITE32(stat.ctime.tv_nsec);
2417 }
2418 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2419 if ((buflen -= 12) < 0)
2420 goto out_resource;
2421 WRITE32(0);
2422 WRITE32(stat.mtime.tv_sec);
2423 WRITE32(stat.mtime.tv_nsec);
2424 }
2425 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2426 if ((buflen -= 8) < 0)
2427 goto out_resource;
2428 /*
2429 * Get parent's attributes if not ignoring crossmount
2430 * and this is the root of a cross-mounted filesystem.
2431 */
2432 if (ignore_crossmnt == 0 &&
2433 dentry == exp->ex_path.mnt->mnt_root) {
2434 struct path path = exp->ex_path;
2435 path_get(&path);
2436 while (follow_up(&path)) {
2437 if (path.dentry != path.mnt->mnt_root)
2438 break;
2439 }
2440 err = vfs_getattr(path.mnt, path.dentry, &stat);
2441 path_put(&path);
2442 if (err)
2443 goto out_nfserr;
2444 }
2445 WRITE64(stat.ino);
2446 }
2447 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2448 WRITE32(3);
2449 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2450 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2451 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2452 }
2453
2454 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2455 *countp = p - buffer;
2456 status = nfs_ok;
2457
2458out:
2459 kfree(acl);
2460 if (fhp == &tempfh)
2461 fh_put(&tempfh);
2462 return status;
2463out_nfserr:
2464 status = nfserrno(err);
2465 goto out;
2466out_resource:
2467 *countp = 0;
2468 status = nfserr_resource;
2469 goto out;
2470out_serverfault:
2471 status = nfserr_serverfault;
2472 goto out;
2473}
2474
2475static inline int attributes_need_mount(u32 *bmval)
2476{
2477 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2478 return 1;
2479 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2480 return 1;
2481 return 0;
2482}
2483
2484static __be32
2485nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2486 const char *name, int namlen, __be32 *p, int *buflen)
2487{
2488 struct svc_export *exp = cd->rd_fhp->fh_export;
2489 struct dentry *dentry;
2490 __be32 nfserr;
2491 int ignore_crossmnt = 0;
2492
2493 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2494 if (IS_ERR(dentry))
2495 return nfserrno(PTR_ERR(dentry));
2496 if (!dentry->d_inode) {
2497 /*
2498 * nfsd_buffered_readdir drops the i_mutex between
2499 * readdir and calling this callback, leaving a window
2500 * where this directory entry could have gone away.
2501 */
2502 dput(dentry);
2503 return nfserr_noent;
2504 }
2505
2506 exp_get(exp);
2507 /*
2508 * In the case of a mountpoint, the client may be asking for
2509 * attributes that are only properties of the underlying filesystem
2510 * as opposed to the cross-mounted file system. In such a case,
2511 * we will not follow the cross mount and will fill the attribtutes
2512 * directly from the mountpoint dentry.
2513 */
2514 if (nfsd_mountpoint(dentry, exp)) {
2515 int err;
2516
2517 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2518 && !attributes_need_mount(cd->rd_bmval)) {
2519 ignore_crossmnt = 1;
2520 goto out_encode;
2521 }
2522 /*
2523 * Why the heck aren't we just using nfsd_lookup??
2524 * Different "."/".." handling? Something else?
2525 * At least, add a comment here to explain....
2526 */
2527 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2528 if (err) {
2529 nfserr = nfserrno(err);
2530 goto out_put;
2531 }
2532 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2533 if (nfserr)
2534 goto out_put;
2535
2536 }
2537out_encode:
2538 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2539 cd->rd_rqstp, ignore_crossmnt);
2540out_put:
2541 dput(dentry);
2542 exp_put(exp);
2543 return nfserr;
2544}
2545
2546static __be32 *
2547nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2548{
2549 __be32 *attrlenp;
2550
2551 if (buflen < 6)
2552 return NULL;
2553 *p++ = htonl(2);
2554 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2555 *p++ = htonl(0); /* bmval1 */
2556
2557 attrlenp = p++;
2558 *p++ = nfserr; /* no htonl */
2559 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2560 return p;
2561}
2562
2563static int
2564nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2565 loff_t offset, u64 ino, unsigned int d_type)
2566{
2567 struct readdir_cd *ccd = ccdv;
2568 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2569 int buflen;
2570 __be32 *p = cd->buffer;
2571 __be32 *cookiep;
2572 __be32 nfserr = nfserr_toosmall;
2573
2574 /* In nfsv4, "." and ".." never make it onto the wire.. */
2575 if (name && isdotent(name, namlen)) {
2576 cd->common.err = nfs_ok;
2577 return 0;
2578 }
2579
2580 if (cd->offset)
2581 xdr_encode_hyper(cd->offset, (u64) offset);
2582
2583 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2584 if (buflen < 0)
2585 goto fail;
2586
2587 *p++ = xdr_one; /* mark entry present */
2588 cookiep = p;
2589 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2590 p = xdr_encode_array(p, name, namlen); /* name length & name */
2591
2592 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2593 switch (nfserr) {
2594 case nfs_ok:
2595 p += buflen;
2596 break;
2597 case nfserr_resource:
2598 nfserr = nfserr_toosmall;
2599 goto fail;
2600 case nfserr_noent:
2601 goto skip_entry;
2602 default:
2603 /*
2604 * If the client requested the RDATTR_ERROR attribute,
2605 * we stuff the error code into this attribute
2606 * and continue. If this attribute was not requested,
2607 * then in accordance with the spec, we fail the
2608 * entire READDIR operation(!)
2609 */
2610 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2611 goto fail;
2612 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2613 if (p == NULL) {
2614 nfserr = nfserr_toosmall;
2615 goto fail;
2616 }
2617 }
2618 cd->buflen -= (p - cd->buffer);
2619 cd->buffer = p;
2620 cd->offset = cookiep;
2621skip_entry:
2622 cd->common.err = nfs_ok;
2623 return 0;
2624fail:
2625 cd->common.err = nfserr;
2626 return -EINVAL;
2627}
2628
2629static void
2630nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2631{
2632 __be32 *p;
2633
2634 RESERVE_SPACE(sizeof(stateid_t));
2635 WRITE32(sid->si_generation);
2636 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2637 ADJUST_ARGS();
2638}
2639
2640static __be32
2641nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2642{
2643 __be32 *p;
2644
2645 if (!nfserr) {
2646 RESERVE_SPACE(8);
2647 WRITE32(access->ac_supported);
2648 WRITE32(access->ac_resp_access);
2649 ADJUST_ARGS();
2650 }
2651 return nfserr;
2652}
2653
2654static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2655{
2656 __be32 *p;
2657
2658 if (!nfserr) {
2659 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2660 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2661 WRITE32(bcts->dir);
2662 /* XXX: ? */
2663 WRITE32(0);
2664 ADJUST_ARGS();
2665 }
2666 return nfserr;
2667}
2668
2669static __be32
2670nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2671{
2672 ENCODE_SEQID_OP_HEAD;
2673
2674 if (!nfserr)
2675 nfsd4_encode_stateid(resp, &close->cl_stateid);
2676
2677 encode_seqid_op_tail(resp, save, nfserr);
2678 return nfserr;
2679}
2680
2681
2682static __be32
2683nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2684{
2685 __be32 *p;
2686
2687 if (!nfserr) {
2688 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2689 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2690 ADJUST_ARGS();
2691 }
2692 return nfserr;
2693}
2694
2695static __be32
2696nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2697{
2698 __be32 *p;
2699
2700 if (!nfserr) {
2701 RESERVE_SPACE(32);
2702 write_cinfo(&p, &create->cr_cinfo);
2703 WRITE32(2);
2704 WRITE32(create->cr_bmval[0]);
2705 WRITE32(create->cr_bmval[1]);
2706 ADJUST_ARGS();
2707 }
2708 return nfserr;
2709}
2710
2711static __be32
2712nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2713{
2714 struct svc_fh *fhp = getattr->ga_fhp;
2715 int buflen;
2716
2717 if (nfserr)
2718 return nfserr;
2719
2720 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2721 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2722 resp->p, &buflen, getattr->ga_bmval,
2723 resp->rqstp, 0);
2724 if (!nfserr)
2725 resp->p += buflen;
2726 return nfserr;
2727}
2728
2729static __be32
2730nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2731{
2732 struct svc_fh *fhp = *fhpp;
2733 unsigned int len;
2734 __be32 *p;
2735
2736 if (!nfserr) {
2737 len = fhp->fh_handle.fh_size;
2738 RESERVE_SPACE(len + 4);
2739 WRITE32(len);
2740 WRITEMEM(&fhp->fh_handle.fh_base, len);
2741 ADJUST_ARGS();
2742 }
2743 return nfserr;
2744}
2745
2746/*
2747* Including all fields other than the name, a LOCK4denied structure requires
2748* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2749*/
2750static void
2751nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2752{
2753 struct xdr_netobj *conf = &ld->ld_owner;
2754 __be32 *p;
2755
2756 RESERVE_SPACE(32 + XDR_LEN(conf->len));
2757 WRITE64(ld->ld_start);
2758 WRITE64(ld->ld_length);
2759 WRITE32(ld->ld_type);
2760 if (conf->len) {
2761 WRITEMEM(&ld->ld_clientid, 8);
2762 WRITE32(conf->len);
2763 WRITEMEM(conf->data, conf->len);
2764 kfree(conf->data);
2765 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2766 WRITE64((u64)0); /* clientid */
2767 WRITE32(0); /* length of owner name */
2768 }
2769 ADJUST_ARGS();
2770}
2771
2772static __be32
2773nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2774{
2775 ENCODE_SEQID_OP_HEAD;
2776
2777 if (!nfserr)
2778 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2779 else if (nfserr == nfserr_denied)
2780 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2781
2782 encode_seqid_op_tail(resp, save, nfserr);
2783 return nfserr;
2784}
2785
2786static __be32
2787nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2788{
2789 if (nfserr == nfserr_denied)
2790 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2791 return nfserr;
2792}
2793
2794static __be32
2795nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2796{
2797 ENCODE_SEQID_OP_HEAD;
2798
2799 if (!nfserr)
2800 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2801
2802 encode_seqid_op_tail(resp, save, nfserr);
2803 return nfserr;
2804}
2805
2806
2807static __be32
2808nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2809{
2810 __be32 *p;
2811
2812 if (!nfserr) {
2813 RESERVE_SPACE(20);
2814 write_cinfo(&p, &link->li_cinfo);
2815 ADJUST_ARGS();
2816 }
2817 return nfserr;
2818}
2819
2820
2821static __be32
2822nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2823{
2824 __be32 *p;
2825 ENCODE_SEQID_OP_HEAD;
2826
2827 if (nfserr)
2828 goto out;
2829
2830 nfsd4_encode_stateid(resp, &open->op_stateid);
2831 RESERVE_SPACE(40);
2832 write_cinfo(&p, &open->op_cinfo);
2833 WRITE32(open->op_rflags);
2834 WRITE32(2);
2835 WRITE32(open->op_bmval[0]);
2836 WRITE32(open->op_bmval[1]);
2837 WRITE32(open->op_delegate_type);
2838 ADJUST_ARGS();
2839
2840 switch (open->op_delegate_type) {
2841 case NFS4_OPEN_DELEGATE_NONE:
2842 break;
2843 case NFS4_OPEN_DELEGATE_READ:
2844 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2845 RESERVE_SPACE(20);
2846 WRITE32(open->op_recall);
2847
2848 /*
2849 * TODO: ACE's in delegations
2850 */
2851 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2852 WRITE32(0);
2853 WRITE32(0);
2854 WRITE32(0); /* XXX: is NULL principal ok? */
2855 ADJUST_ARGS();
2856 break;
2857 case NFS4_OPEN_DELEGATE_WRITE:
2858 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2859 RESERVE_SPACE(32);
2860 WRITE32(0);
2861
2862 /*
2863 * TODO: space_limit's in delegations
2864 */
2865 WRITE32(NFS4_LIMIT_SIZE);
2866 WRITE32(~(u32)0);
2867 WRITE32(~(u32)0);
2868
2869 /*
2870 * TODO: ACE's in delegations
2871 */
2872 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2873 WRITE32(0);
2874 WRITE32(0);
2875 WRITE32(0); /* XXX: is NULL principal ok? */
2876 ADJUST_ARGS();
2877 break;
2878 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2879 switch (open->op_why_no_deleg) {
2880 case WND4_CONTENTION:
2881 case WND4_RESOURCE:
2882 RESERVE_SPACE(8);
2883 WRITE32(open->op_why_no_deleg);
2884 WRITE32(0); /* deleg signaling not supported yet */
2885 break;
2886 default:
2887 RESERVE_SPACE(4);
2888 WRITE32(open->op_why_no_deleg);
2889 }
2890 ADJUST_ARGS();
2891 break;
2892 default:
2893 BUG();
2894 }
2895 /* XXX save filehandle here */
2896out:
2897 encode_seqid_op_tail(resp, save, nfserr);
2898 return nfserr;
2899}
2900
2901static __be32
2902nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2903{
2904 ENCODE_SEQID_OP_HEAD;
2905
2906 if (!nfserr)
2907 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2908
2909 encode_seqid_op_tail(resp, save, nfserr);
2910 return nfserr;
2911}
2912
2913static __be32
2914nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2915{
2916 ENCODE_SEQID_OP_HEAD;
2917
2918 if (!nfserr)
2919 nfsd4_encode_stateid(resp, &od->od_stateid);
2920
2921 encode_seqid_op_tail(resp, save, nfserr);
2922 return nfserr;
2923}
2924
2925static __be32
2926nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2927 struct nfsd4_read *read)
2928{
2929 u32 eof;
2930 int v, pn;
2931 unsigned long maxcount;
2932 long len;
2933 __be32 *p;
2934
2935 if (nfserr)
2936 return nfserr;
2937 if (resp->xbuf->page_len)
2938 return nfserr_resource;
2939
2940 RESERVE_SPACE(8); /* eof flag and byte count */
2941
2942 maxcount = svc_max_payload(resp->rqstp);
2943 if (maxcount > read->rd_length)
2944 maxcount = read->rd_length;
2945
2946 len = maxcount;
2947 v = 0;
2948 while (len > 0) {
2949 pn = resp->rqstp->rq_resused++;
2950 resp->rqstp->rq_vec[v].iov_base =
2951 page_address(resp->rqstp->rq_respages[pn]);
2952 resp->rqstp->rq_vec[v].iov_len =
2953 len < PAGE_SIZE ? len : PAGE_SIZE;
2954 v++;
2955 len -= PAGE_SIZE;
2956 }
2957 read->rd_vlen = v;
2958
2959 nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2960 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2961 &maxcount);
2962
2963 if (nfserr)
2964 return nfserr;
2965 eof = (read->rd_offset + maxcount >=
2966 read->rd_fhp->fh_dentry->d_inode->i_size);
2967
2968 WRITE32(eof);
2969 WRITE32(maxcount);
2970 ADJUST_ARGS();
2971 resp->xbuf->head[0].iov_len = (char*)p
2972 - (char*)resp->xbuf->head[0].iov_base;
2973 resp->xbuf->page_len = maxcount;
2974
2975 /* Use rest of head for padding and remaining ops: */
2976 resp->xbuf->tail[0].iov_base = p;
2977 resp->xbuf->tail[0].iov_len = 0;
2978 if (maxcount&3) {
2979 RESERVE_SPACE(4);
2980 WRITE32(0);
2981 resp->xbuf->tail[0].iov_base += maxcount&3;
2982 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2983 ADJUST_ARGS();
2984 }
2985 return 0;
2986}
2987
2988static __be32
2989nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2990{
2991 int maxcount;
2992 char *page;
2993 __be32 *p;
2994
2995 if (nfserr)
2996 return nfserr;
2997 if (resp->xbuf->page_len)
2998 return nfserr_resource;
2999
3000 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3001
3002 maxcount = PAGE_SIZE;
3003 RESERVE_SPACE(4);
3004
3005 /*
3006 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3007 * if they would overflow the buffer. Is this kosher in NFSv4? If
3008 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3009 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3010 */
3011 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3012 if (nfserr == nfserr_isdir)
3013 return nfserr_inval;
3014 if (nfserr)
3015 return nfserr;
3016
3017 WRITE32(maxcount);
3018 ADJUST_ARGS();
3019 resp->xbuf->head[0].iov_len = (char*)p
3020 - (char*)resp->xbuf->head[0].iov_base;
3021 resp->xbuf->page_len = maxcount;
3022
3023 /* Use rest of head for padding and remaining ops: */
3024 resp->xbuf->tail[0].iov_base = p;
3025 resp->xbuf->tail[0].iov_len = 0;
3026 if (maxcount&3) {
3027 RESERVE_SPACE(4);
3028 WRITE32(0);
3029 resp->xbuf->tail[0].iov_base += maxcount&3;
3030 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3031 ADJUST_ARGS();
3032 }
3033 return 0;
3034}
3035
3036static __be32
3037nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3038{
3039 int maxcount;
3040 loff_t offset;
3041 __be32 *page, *savep, *tailbase;
3042 __be32 *p;
3043
3044 if (nfserr)
3045 return nfserr;
3046 if (resp->xbuf->page_len)
3047 return nfserr_resource;
3048
3049 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3050 savep = p;
3051
3052 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3053 WRITE32(0);
3054 WRITE32(0);
3055 ADJUST_ARGS();
3056 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3057 tailbase = p;
3058
3059 maxcount = PAGE_SIZE;
3060 if (maxcount > readdir->rd_maxcount)
3061 maxcount = readdir->rd_maxcount;
3062
3063 /*
3064 * Convert from bytes to words, account for the two words already
3065 * written, make sure to leave two words at the end for the next
3066 * pointer and eof field.
3067 */
3068 maxcount = (maxcount >> 2) - 4;
3069 if (maxcount < 0) {
3070 nfserr = nfserr_toosmall;
3071 goto err_no_verf;
3072 }
3073
3074 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3075 readdir->common.err = 0;
3076 readdir->buflen = maxcount;
3077 readdir->buffer = page;
3078 readdir->offset = NULL;
3079
3080 offset = readdir->rd_cookie;
3081 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3082 &offset,
3083 &readdir->common, nfsd4_encode_dirent);
3084 if (nfserr == nfs_ok &&
3085 readdir->common.err == nfserr_toosmall &&
3086 readdir->buffer == page)
3087 nfserr = nfserr_toosmall;
3088 if (nfserr)
3089 goto err_no_verf;
3090
3091 if (readdir->offset)
3092 xdr_encode_hyper(readdir->offset, offset);
3093
3094 p = readdir->buffer;
3095 *p++ = 0; /* no more entries */
3096 *p++ = htonl(readdir->common.err == nfserr_eof);
3097 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3098 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3099
3100 /* Use rest of head for padding and remaining ops: */
3101 resp->xbuf->tail[0].iov_base = tailbase;
3102 resp->xbuf->tail[0].iov_len = 0;
3103 resp->p = resp->xbuf->tail[0].iov_base;
3104 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3105
3106 return 0;
3107err_no_verf:
3108 p = savep;
3109 ADJUST_ARGS();
3110 return nfserr;
3111}
3112
3113static __be32
3114nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3115{
3116 __be32 *p;
3117
3118 if (!nfserr) {
3119 RESERVE_SPACE(20);
3120 write_cinfo(&p, &remove->rm_cinfo);
3121 ADJUST_ARGS();
3122 }
3123 return nfserr;
3124}
3125
3126static __be32
3127nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3128{
3129 __be32 *p;
3130
3131 if (!nfserr) {
3132 RESERVE_SPACE(40);
3133 write_cinfo(&p, &rename->rn_sinfo);
3134 write_cinfo(&p, &rename->rn_tinfo);
3135 ADJUST_ARGS();
3136 }
3137 return nfserr;
3138}
3139
3140static __be32
3141nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3142 __be32 nfserr,struct svc_export *exp)
3143{
3144 int i = 0;
3145 u32 nflavs;
3146 struct exp_flavor_info *flavs;
3147 struct exp_flavor_info def_flavs[2];
3148 __be32 *p;
3149
3150 if (nfserr)
3151 goto out;
3152 if (exp->ex_nflavors) {
3153 flavs = exp->ex_flavors;
3154 nflavs = exp->ex_nflavors;
3155 } else { /* Handling of some defaults in absence of real secinfo: */
3156 flavs = def_flavs;
3157 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3158 nflavs = 2;
3159 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3160 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3161 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3162 nflavs = 1;
3163 flavs[0].pseudoflavor
3164 = svcauth_gss_flavor(exp->ex_client);
3165 } else {
3166 nflavs = 1;
3167 flavs[0].pseudoflavor
3168 = exp->ex_client->flavour->flavour;
3169 }
3170 }
3171
3172 RESERVE_SPACE(4);
3173 WRITE32(nflavs);
3174 ADJUST_ARGS();
3175 for (i = 0; i < nflavs; i++) {
3176 u32 flav = flavs[i].pseudoflavor;
3177 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3178
3179 if (gm) {
3180 RESERVE_SPACE(4);
3181 WRITE32(RPC_AUTH_GSS);
3182 ADJUST_ARGS();
3183 RESERVE_SPACE(4 + gm->gm_oid.len);
3184 WRITE32(gm->gm_oid.len);
3185 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3186 ADJUST_ARGS();
3187 RESERVE_SPACE(4);
3188 WRITE32(0); /* qop */
3189 ADJUST_ARGS();
3190 RESERVE_SPACE(4);
3191 WRITE32(gss_pseudoflavor_to_service(gm, flav));
3192 ADJUST_ARGS();
3193 gss_mech_put(gm);
3194 } else {
3195 RESERVE_SPACE(4);
3196 WRITE32(flav);
3197 ADJUST_ARGS();
3198 }
3199 }
3200out:
3201 if (exp)
3202 exp_put(exp);
3203 return nfserr;
3204}
3205
3206static __be32
3207nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3208 struct nfsd4_secinfo *secinfo)
3209{
3210 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3211}
3212
3213static __be32
3214nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3215 struct nfsd4_secinfo_no_name *secinfo)
3216{
3217 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3218}
3219
3220/*
3221 * The SETATTR encode routine is special -- it always encodes a bitmap,
3222 * regardless of the error status.
3223 */
3224static __be32
3225nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3226{
3227 __be32 *p;
3228
3229 RESERVE_SPACE(12);
3230 if (nfserr) {
3231 WRITE32(2);
3232 WRITE32(0);
3233 WRITE32(0);
3234 }
3235 else {
3236 WRITE32(2);
3237 WRITE32(setattr->sa_bmval[0]);
3238 WRITE32(setattr->sa_bmval[1]);
3239 }
3240 ADJUST_ARGS();
3241 return nfserr;
3242}
3243
3244static __be32
3245nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3246{
3247 __be32 *p;
3248
3249 if (!nfserr) {
3250 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3251 WRITEMEM(&scd->se_clientid, 8);
3252 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3253 ADJUST_ARGS();
3254 }
3255 else if (nfserr == nfserr_clid_inuse) {
3256 RESERVE_SPACE(8);
3257 WRITE32(0);
3258 WRITE32(0);
3259 ADJUST_ARGS();
3260 }
3261 return nfserr;
3262}
3263
3264static __be32
3265nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3266{
3267 __be32 *p;
3268
3269 if (!nfserr) {
3270 RESERVE_SPACE(16);
3271 WRITE32(write->wr_bytes_written);
3272 WRITE32(write->wr_how_written);
3273 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3274 ADJUST_ARGS();
3275 }
3276 return nfserr;
3277}
3278
3279static __be32
3280nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3281 struct nfsd4_exchange_id *exid)
3282{
3283 __be32 *p;
3284 char *major_id;
3285 char *server_scope;
3286 int major_id_sz;
3287 int server_scope_sz;
3288 uint64_t minor_id = 0;
3289
3290 if (nfserr)
3291 return nfserr;
3292
3293 major_id = utsname()->nodename;
3294 major_id_sz = strlen(major_id);
3295 server_scope = utsname()->nodename;
3296 server_scope_sz = strlen(server_scope);
3297
3298 RESERVE_SPACE(
3299 8 /* eir_clientid */ +
3300 4 /* eir_sequenceid */ +
3301 4 /* eir_flags */ +
3302 4 /* spr_how (SP4_NONE) */ +
3303 8 /* so_minor_id */ +
3304 4 /* so_major_id.len */ +
3305 (XDR_QUADLEN(major_id_sz) * 4) +
3306 4 /* eir_server_scope.len */ +
3307 (XDR_QUADLEN(server_scope_sz) * 4) +
3308 4 /* eir_server_impl_id.count (0) */);
3309
3310 WRITEMEM(&exid->clientid, 8);
3311 WRITE32(exid->seqid);
3312 WRITE32(exid->flags);
3313
3314 /* state_protect4_r. Currently only support SP4_NONE */
3315 BUG_ON(exid->spa_how != SP4_NONE);
3316 WRITE32(exid->spa_how);
3317
3318 /* The server_owner struct */
3319 WRITE64(minor_id); /* Minor id */
3320 /* major id */
3321 WRITE32(major_id_sz);
3322 WRITEMEM(major_id, major_id_sz);
3323
3324 /* Server scope */
3325 WRITE32(server_scope_sz);
3326 WRITEMEM(server_scope, server_scope_sz);
3327
3328 /* Implementation id */
3329 WRITE32(0); /* zero length nfs_impl_id4 array */
3330 ADJUST_ARGS();
3331 return 0;
3332}
3333
3334static __be32
3335nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3336 struct nfsd4_create_session *sess)
3337{
3338 __be32 *p;
3339
3340 if (nfserr)
3341 return nfserr;
3342
3343 RESERVE_SPACE(24);
3344 WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3345 WRITE32(sess->seqid);
3346 WRITE32(sess->flags);
3347 ADJUST_ARGS();
3348
3349 RESERVE_SPACE(28);
3350 WRITE32(0); /* headerpadsz */
3351 WRITE32(sess->fore_channel.maxreq_sz);
3352 WRITE32(sess->fore_channel.maxresp_sz);
3353 WRITE32(sess->fore_channel.maxresp_cached);
3354 WRITE32(sess->fore_channel.maxops);
3355 WRITE32(sess->fore_channel.maxreqs);
3356 WRITE32(sess->fore_channel.nr_rdma_attrs);
3357 ADJUST_ARGS();
3358
3359 if (sess->fore_channel.nr_rdma_attrs) {
3360 RESERVE_SPACE(4);
3361 WRITE32(sess->fore_channel.rdma_attrs);
3362 ADJUST_ARGS();
3363 }
3364
3365 RESERVE_SPACE(28);
3366 WRITE32(0); /* headerpadsz */
3367 WRITE32(sess->back_channel.maxreq_sz);
3368 WRITE32(sess->back_channel.maxresp_sz);
3369 WRITE32(sess->back_channel.maxresp_cached);
3370 WRITE32(sess->back_channel.maxops);
3371 WRITE32(sess->back_channel.maxreqs);
3372 WRITE32(sess->back_channel.nr_rdma_attrs);
3373 ADJUST_ARGS();
3374
3375 if (sess->back_channel.nr_rdma_attrs) {
3376 RESERVE_SPACE(4);
3377 WRITE32(sess->back_channel.rdma_attrs);
3378 ADJUST_ARGS();
3379 }
3380 return 0;
3381}
3382
3383static __be32
3384nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3385 struct nfsd4_destroy_session *destroy_session)
3386{
3387 return nfserr;
3388}
3389
3390static __be32
3391nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3392 struct nfsd4_free_stateid *free_stateid)
3393{
3394 __be32 *p;
3395
3396 if (nfserr)
3397 return nfserr;
3398
3399 RESERVE_SPACE(4);
3400 *p++ = nfserr;
3401 ADJUST_ARGS();
3402 return nfserr;
3403}
3404
3405static __be32
3406nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3407 struct nfsd4_sequence *seq)
3408{
3409 __be32 *p;
3410
3411 if (nfserr)
3412 return nfserr;
3413
3414 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3415 WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3416 WRITE32(seq->seqid);
3417 WRITE32(seq->slotid);
3418 /* Note slotid's are numbered from zero: */
3419 WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3420 WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3421 WRITE32(seq->status_flags);
3422
3423 ADJUST_ARGS();
3424 resp->cstate.datap = p; /* DRC cache data pointer */
3425 return 0;
3426}
3427
3428static __be32
3429nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3430 struct nfsd4_test_stateid *test_stateid)
3431{
3432 struct nfsd4_test_stateid_id *stateid, *next;
3433 __be32 *p;
3434
3435 RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3436 *p++ = htonl(test_stateid->ts_num_ids);
3437
3438 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3439 *p++ = stateid->ts_id_status;
3440 }
3441
3442 ADJUST_ARGS();
3443 return nfserr;
3444}
3445
3446static __be32
3447nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3448{
3449 return nfserr;
3450}
3451
3452typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3453
3454/*
3455 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3456 * since we don't need to filter out obsolete ops as this is
3457 * done in the decoding phase.
3458 */
3459static nfsd4_enc nfsd4_enc_ops[] = {
3460 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3461 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3462 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3463 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3464 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3465 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3466 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3467 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3468 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3469 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3470 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3471 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3472 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3473 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3474 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3475 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3476 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3477 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3478 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3479 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3480 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3481 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3482 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3483 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3484 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3485 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3486 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3487 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3488 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3489 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3490 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3491 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3492 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3493 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3494 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3495 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3496 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3497
3498 /* NFSv4.1 operations */
3499 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3500 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3501 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3502 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3503 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_destroy_session,
3504 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_free_stateid,
3505 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3506 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3507 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3508 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3509 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3510 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3511 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3512 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3513 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3514 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3515 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3516 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3517 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3518};
3519
3520/*
3521 * Calculate the total amount of memory that the compound response has taken
3522 * after encoding the current operation with pad.
3523 *
3524 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3525 * which was specified at nfsd4_operation, else pad is zero.
3526 *
3527 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3528 *
3529 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3530 * will be at least a page and will therefore hold the xdr_buf head.
3531 */
3532__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3533{
3534 struct xdr_buf *xb = &resp->rqstp->rq_res;
3535 struct nfsd4_session *session = NULL;
3536 struct nfsd4_slot *slot = resp->cstate.slot;
3537 u32 length, tlen = 0;
3538
3539 if (!nfsd4_has_session(&resp->cstate))
3540 return 0;
3541
3542 session = resp->cstate.session;
3543 if (session == NULL)
3544 return 0;
3545
3546 if (xb->page_len == 0) {
3547 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3548 } else {
3549 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3550 tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3551
3552 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3553 }
3554 dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3555 length, xb->page_len, tlen, pad);
3556
3557 if (length > session->se_fchannel.maxresp_sz)
3558 return nfserr_rep_too_big;
3559
3560 if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3561 length > session->se_fchannel.maxresp_cached)
3562 return nfserr_rep_too_big_to_cache;
3563
3564 return 0;
3565}
3566
3567void
3568nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3569{
3570 __be32 *statp;
3571 __be32 *p;
3572
3573 RESERVE_SPACE(8);
3574 WRITE32(op->opnum);
3575 statp = p++; /* to be backfilled at the end */
3576 ADJUST_ARGS();
3577
3578 if (op->opnum == OP_ILLEGAL)
3579 goto status;
3580 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3581 !nfsd4_enc_ops[op->opnum]);
3582 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3583 /* nfsd4_check_drc_limit guarantees enough room for error status */
3584 if (!op->status)
3585 op->status = nfsd4_check_resp_size(resp, 0);
3586status:
3587 /*
3588 * Note: We write the status directly, instead of using WRITE32(),
3589 * since it is already in network byte order.
3590 */
3591 *statp = op->status;
3592}
3593
3594/*
3595 * Encode the reply stored in the stateowner reply cache
3596 *
3597 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3598 * previously sent already encoded operation.
3599 *
3600 * called with nfs4_lock_state() held
3601 */
3602void
3603nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3604{
3605 __be32 *p;
3606 struct nfs4_replay *rp = op->replay;
3607
3608 BUG_ON(!rp);
3609
3610 RESERVE_SPACE(8);
3611 WRITE32(op->opnum);
3612 *p++ = rp->rp_status; /* already xdr'ed */
3613 ADJUST_ARGS();
3614
3615 RESERVE_SPACE(rp->rp_buflen);
3616 WRITEMEM(rp->rp_buf, rp->rp_buflen);
3617 ADJUST_ARGS();
3618}
3619
3620int
3621nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3622{
3623 return xdr_ressize_check(rqstp, p);
3624}
3625
3626int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3627{
3628 struct svc_rqst *rqstp = rq;
3629 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3630
3631 if (args->ops != args->iops) {
3632 kfree(args->ops);
3633 args->ops = args->iops;
3634 }
3635 kfree(args->tmpp);
3636 args->tmpp = NULL;
3637 while (args->to_free) {
3638 struct tmpbuf *tb = args->to_free;
3639 args->to_free = tb->next;
3640 tb->release(tb->buf);
3641 kfree(tb);
3642 }
3643 return 1;
3644}
3645
3646int
3647nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3648{
3649 args->p = p;
3650 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3651 args->pagelist = rqstp->rq_arg.pages;
3652 args->pagelen = rqstp->rq_arg.page_len;
3653 args->tmpp = NULL;
3654 args->to_free = NULL;
3655 args->ops = args->iops;
3656 args->rqstp = rqstp;
3657
3658 return !nfsd4_decode_compound(args);
3659}
3660
3661int
3662nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3663{
3664 /*
3665 * All that remains is to write the tag and operation count...
3666 */
3667 struct nfsd4_compound_state *cs = &resp->cstate;
3668 struct kvec *iov;
3669 p = resp->tagp;
3670 *p++ = htonl(resp->taglen);
3671 memcpy(p, resp->tag, resp->taglen);
3672 p += XDR_QUADLEN(resp->taglen);
3673 *p++ = htonl(resp->opcnt);
3674
3675 if (rqstp->rq_res.page_len)
3676 iov = &rqstp->rq_res.tail[0];
3677 else
3678 iov = &rqstp->rq_res.head[0];
3679 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3680 BUG_ON(iov->iov_len > PAGE_SIZE);
3681 if (nfsd4_has_session(cs)) {
3682 if (cs->status != nfserr_replay_cache) {
3683 nfsd4_store_cache_entry(resp);
3684 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3685 }
3686 /* Renew the clientid on success and on replay */
3687 release_session_client(cs->session);
3688 nfsd4_put_session(cs->session);
3689 }
3690 return 1;
3691}
3692
3693/*
3694 * Local variables:
3695 * c-basic-offset: 8
3696 * End:
3697 */