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TTY: fix UV serial console regression
[zen-stable.git] / fs / nfsd / nfs4xdr.c
blob0ec5a1b9700e5e8d59196cfa387f608aa5c7f0ce
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
67 static __be32
68 check_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; \
87 out: \
88 return status; \
89 xdr_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
136 static void save_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
137 {
138 savep->p = argp->p;
139 savep->end = argp->end;
140 savep->pagelen = argp->pagelen;
141 savep->pagelist = argp->pagelist;
142 }
143
144 static void restore_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
145 {
146 argp->p = savep->p;
147 argp->end = savep->end;
148 argp->pagelen = savep->pagelen;
149 argp->pagelist = savep->pagelist;
150 }
151
152 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
153 {
154 /* We want more bytes than seem to be available.
155 * Maybe we need a new page, maybe we have just run out
156 */
157 unsigned int avail = (char *)argp->end - (char *)argp->p;
158 __be32 *p;
159 if (avail + argp->pagelen < nbytes)
160 return NULL;
161 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
162 return NULL;
163 /* ok, we can do it with the current plus the next page */
164 if (nbytes <= sizeof(argp->tmp))
165 p = argp->tmp;
166 else {
167 kfree(argp->tmpp);
168 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
169 if (!p)
170 return NULL;
171
172 }
173 /*
174 * The following memcpy is safe because read_buf is always
175 * called with nbytes > avail, and the two cases above both
176 * guarantee p points to at least nbytes bytes.
177 */
178 memcpy(p, argp->p, avail);
179 /* step to next page */
180 argp->p = page_address(argp->pagelist[0]);
181 argp->pagelist++;
182 if (argp->pagelen < PAGE_SIZE) {
183 argp->end = argp->p + (argp->pagelen>>2);
184 argp->pagelen = 0;
185 } else {
186 argp->end = argp->p + (PAGE_SIZE>>2);
187 argp->pagelen -= PAGE_SIZE;
188 }
189 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
190 argp->p += XDR_QUADLEN(nbytes - avail);
191 return p;
192 }
193
194 static int zero_clientid(clientid_t *clid)
195 {
196 return (clid->cl_boot == 0) && (clid->cl_id == 0);
197 }
198
199 static int
200 defer_free(struct nfsd4_compoundargs *argp,
201 void (*release)(const void *), void *p)
202 {
203 struct tmpbuf *tb;
204
205 tb = kmalloc(sizeof(*tb), GFP_KERNEL);
206 if (!tb)
207 return -ENOMEM;
208 tb->buf = p;
209 tb->release = release;
210 tb->next = argp->to_free;
211 argp->to_free = tb;
212 return 0;
213 }
214
215 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
216 {
217 if (p == argp->tmp) {
218 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
219 if (!p)
220 return NULL;
221 } else {
222 BUG_ON(p != argp->tmpp);
223 argp->tmpp = NULL;
224 }
225 if (defer_free(argp, kfree, p)) {
226 kfree(p);
227 return NULL;
228 } else
229 return (char *)p;
230 }
231
232 static __be32
233 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
234 {
235 u32 bmlen;
236 DECODE_HEAD;
237
238 bmval[0] = 0;
239 bmval[1] = 0;
240 bmval[2] = 0;
241
242 READ_BUF(4);
243 READ32(bmlen);
244 if (bmlen > 1000)
245 goto xdr_error;
246
247 READ_BUF(bmlen << 2);
248 if (bmlen > 0)
249 READ32(bmval[0]);
250 if (bmlen > 1)
251 READ32(bmval[1]);
252 if (bmlen > 2)
253 READ32(bmval[2]);
254
255 DECODE_TAIL;
256 }
257
258 static __be32
259 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
260 struct iattr *iattr, struct nfs4_acl **acl)
261 {
262 int expected_len, len = 0;
263 u32 dummy32;
264 char *buf;
265 int host_err;
266
267 DECODE_HEAD;
268 iattr->ia_valid = 0;
269 if ((status = nfsd4_decode_bitmap(argp, bmval)))
270 return status;
271
272 READ_BUF(4);
273 READ32(expected_len);
274
275 if (bmval[0] & FATTR4_WORD0_SIZE) {
276 READ_BUF(8);
277 len += 8;
278 READ64(iattr->ia_size);
279 iattr->ia_valid |= ATTR_SIZE;
280 }
281 if (bmval[0] & FATTR4_WORD0_ACL) {
282 int nace;
283 struct nfs4_ace *ace;
284
285 READ_BUF(4); len += 4;
286 READ32(nace);
287
288 if (nace > NFS4_ACL_MAX)
289 return nfserr_resource;
290
291 *acl = nfs4_acl_new(nace);
292 if (*acl == NULL) {
293 host_err = -ENOMEM;
294 goto out_nfserr;
295 }
296 defer_free(argp, kfree, *acl);
297
298 (*acl)->naces = nace;
299 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
300 READ_BUF(16); len += 16;
301 READ32(ace->type);
302 READ32(ace->flag);
303 READ32(ace->access_mask);
304 READ32(dummy32);
305 READ_BUF(dummy32);
306 len += XDR_QUADLEN(dummy32) << 2;
307 READMEM(buf, dummy32);
308 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
309 status = nfs_ok;
310 if (ace->whotype != NFS4_ACL_WHO_NAMED)
311 ace->who = 0;
312 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
313 status = nfsd_map_name_to_gid(argp->rqstp,
314 buf, dummy32, &ace->who);
315 else
316 status = nfsd_map_name_to_uid(argp->rqstp,
317 buf, dummy32, &ace->who);
318 if (status)
319 return status;
320 }
321 } else
322 *acl = NULL;
323 if (bmval[1] & FATTR4_WORD1_MODE) {
324 READ_BUF(4);
325 len += 4;
326 READ32(iattr->ia_mode);
327 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
328 iattr->ia_valid |= ATTR_MODE;
329 }
330 if (bmval[1] & FATTR4_WORD1_OWNER) {
331 READ_BUF(4);
332 len += 4;
333 READ32(dummy32);
334 READ_BUF(dummy32);
335 len += (XDR_QUADLEN(dummy32) << 2);
336 READMEM(buf, dummy32);
337 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
338 return status;
339 iattr->ia_valid |= ATTR_UID;
340 }
341 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
342 READ_BUF(4);
343 len += 4;
344 READ32(dummy32);
345 READ_BUF(dummy32);
346 len += (XDR_QUADLEN(dummy32) << 2);
347 READMEM(buf, dummy32);
348 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
349 return status;
350 iattr->ia_valid |= ATTR_GID;
351 }
352 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
353 READ_BUF(4);
354 len += 4;
355 READ32(dummy32);
356 switch (dummy32) {
357 case NFS4_SET_TO_CLIENT_TIME:
358 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
359 all 32 bits of 'nseconds'. */
360 READ_BUF(12);
361 len += 12;
362 READ32(dummy32);
363 if (dummy32)
364 return nfserr_inval;
365 READ32(iattr->ia_atime.tv_sec);
366 READ32(iattr->ia_atime.tv_nsec);
367 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
368 return nfserr_inval;
369 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
370 break;
371 case NFS4_SET_TO_SERVER_TIME:
372 iattr->ia_valid |= ATTR_ATIME;
373 break;
374 default:
375 goto xdr_error;
376 }
377 }
378 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
379 READ_BUF(4);
380 len += 4;
381 READ32(dummy32);
382 switch (dummy32) {
383 case NFS4_SET_TO_CLIENT_TIME:
384 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
385 all 32 bits of 'nseconds'. */
386 READ_BUF(12);
387 len += 12;
388 READ32(dummy32);
389 if (dummy32)
390 return nfserr_inval;
391 READ32(iattr->ia_mtime.tv_sec);
392 READ32(iattr->ia_mtime.tv_nsec);
393 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
394 return nfserr_inval;
395 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
396 break;
397 case NFS4_SET_TO_SERVER_TIME:
398 iattr->ia_valid |= ATTR_MTIME;
399 break;
400 default:
401 goto xdr_error;
402 }
403 }
404 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
405 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
406 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
407 READ_BUF(expected_len - len);
408 else if (len != expected_len)
409 goto xdr_error;
410
411 DECODE_TAIL;
412
413 out_nfserr:
414 status = nfserrno(host_err);
415 goto out;
416 }
417
418 static __be32
419 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
420 {
421 DECODE_HEAD;
422
423 READ_BUF(sizeof(stateid_t));
424 READ32(sid->si_generation);
425 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
426
427 DECODE_TAIL;
428 }
429
430 static __be32
431 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
432 {
433 DECODE_HEAD;
434
435 READ_BUF(4);
436 READ32(access->ac_req_access);
437
438 DECODE_TAIL;
439 }
440
441 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
442 {
443 DECODE_HEAD;
444
445 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
446 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
447 READ32(bcts->dir);
448 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
449 * could help us figure out we should be using it. */
450 DECODE_TAIL;
451 }
452
453 static __be32
454 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
455 {
456 DECODE_HEAD;
457
458 READ_BUF(4);
459 READ32(close->cl_seqid);
460 return nfsd4_decode_stateid(argp, &close->cl_stateid);
461
462 DECODE_TAIL;
463 }
464
465
466 static __be32
467 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
468 {
469 DECODE_HEAD;
470
471 READ_BUF(12);
472 READ64(commit->co_offset);
473 READ32(commit->co_count);
474
475 DECODE_TAIL;
476 }
477
478 static __be32
479 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
480 {
481 DECODE_HEAD;
482
483 READ_BUF(4);
484 READ32(create->cr_type);
485 switch (create->cr_type) {
486 case NF4LNK:
487 READ_BUF(4);
488 READ32(create->cr_linklen);
489 READ_BUF(create->cr_linklen);
490 SAVEMEM(create->cr_linkname, create->cr_linklen);
491 break;
492 case NF4BLK:
493 case NF4CHR:
494 READ_BUF(8);
495 READ32(create->cr_specdata1);
496 READ32(create->cr_specdata2);
497 break;
498 case NF4SOCK:
499 case NF4FIFO:
500 case NF4DIR:
501 default:
502 break;
503 }
504
505 READ_BUF(4);
506 READ32(create->cr_namelen);
507 READ_BUF(create->cr_namelen);
508 SAVEMEM(create->cr_name, create->cr_namelen);
509 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
510 return status;
511
512 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
513 &create->cr_acl);
514 if (status)
515 goto out;
516
517 DECODE_TAIL;
518 }
519
520 static inline __be32
521 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
522 {
523 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
524 }
525
526 static inline __be32
527 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
528 {
529 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
530 }
531
532 static __be32
533 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
534 {
535 DECODE_HEAD;
536
537 READ_BUF(4);
538 READ32(link->li_namelen);
539 READ_BUF(link->li_namelen);
540 SAVEMEM(link->li_name, link->li_namelen);
541 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
542 return status;
543
544 DECODE_TAIL;
545 }
546
547 static __be32
548 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
549 {
550 DECODE_HEAD;
551
552 /*
553 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
554 */
555 READ_BUF(28);
556 READ32(lock->lk_type);
557 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
558 goto xdr_error;
559 READ32(lock->lk_reclaim);
560 READ64(lock->lk_offset);
561 READ64(lock->lk_length);
562 READ32(lock->lk_is_new);
563
564 if (lock->lk_is_new) {
565 READ_BUF(4);
566 READ32(lock->lk_new_open_seqid);
567 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
568 if (status)
569 return status;
570 READ_BUF(8 + sizeof(clientid_t));
571 READ32(lock->lk_new_lock_seqid);
572 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
573 READ32(lock->lk_new_owner.len);
574 READ_BUF(lock->lk_new_owner.len);
575 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
576 } else {
577 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
578 if (status)
579 return status;
580 READ_BUF(4);
581 READ32(lock->lk_old_lock_seqid);
582 }
583
584 DECODE_TAIL;
585 }
586
587 static __be32
588 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
589 {
590 DECODE_HEAD;
591
592 READ_BUF(32);
593 READ32(lockt->lt_type);
594 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
595 goto xdr_error;
596 READ64(lockt->lt_offset);
597 READ64(lockt->lt_length);
598 COPYMEM(&lockt->lt_clientid, 8);
599 READ32(lockt->lt_owner.len);
600 READ_BUF(lockt->lt_owner.len);
601 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
602
603 DECODE_TAIL;
604 }
605
606 static __be32
607 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
608 {
609 DECODE_HEAD;
610
611 READ_BUF(8);
612 READ32(locku->lu_type);
613 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
614 goto xdr_error;
615 READ32(locku->lu_seqid);
616 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
617 if (status)
618 return status;
619 READ_BUF(16);
620 READ64(locku->lu_offset);
621 READ64(locku->lu_length);
622
623 DECODE_TAIL;
624 }
625
626 static __be32
627 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
628 {
629 DECODE_HEAD;
630
631 READ_BUF(4);
632 READ32(lookup->lo_len);
633 READ_BUF(lookup->lo_len);
634 SAVEMEM(lookup->lo_name, lookup->lo_len);
635 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
636 return status;
637
638 DECODE_TAIL;
639 }
640
641 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
642 {
643 __be32 *p;
644 u32 w;
645
646 READ_BUF(4);
647 READ32(w);
648 *x = w;
649 switch (w & NFS4_SHARE_ACCESS_MASK) {
650 case NFS4_SHARE_ACCESS_READ:
651 case NFS4_SHARE_ACCESS_WRITE:
652 case NFS4_SHARE_ACCESS_BOTH:
653 break;
654 default:
655 return nfserr_bad_xdr;
656 }
657 w &= ~NFS4_SHARE_ACCESS_MASK;
658 if (!w)
659 return nfs_ok;
660 if (!argp->minorversion)
661 return nfserr_bad_xdr;
662 switch (w & NFS4_SHARE_WANT_MASK) {
663 case NFS4_SHARE_WANT_NO_PREFERENCE:
664 case NFS4_SHARE_WANT_READ_DELEG:
665 case NFS4_SHARE_WANT_WRITE_DELEG:
666 case NFS4_SHARE_WANT_ANY_DELEG:
667 case NFS4_SHARE_WANT_NO_DELEG:
668 case NFS4_SHARE_WANT_CANCEL:
669 break;
670 default:
671 return nfserr_bad_xdr;
672 }
673 w &= ~NFS4_SHARE_WANT_MASK;
674 if (!w)
675 return nfs_ok;
676 switch (w) {
677 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
678 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
679 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
680 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
681 return nfs_ok;
682 }
683 xdr_error:
684 return nfserr_bad_xdr;
685 }
686
687 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
688 {
689 __be32 *p;
690
691 READ_BUF(4);
692 READ32(*x);
693 /* Note: unlinke access bits, deny bits may be zero. */
694 if (*x & ~NFS4_SHARE_DENY_BOTH)
695 return nfserr_bad_xdr;
696 return nfs_ok;
697 xdr_error:
698 return nfserr_bad_xdr;
699 }
700
701 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
702 {
703 __be32 *p;
704
705 READ_BUF(4);
706 READ32(o->len);
707
708 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
709 return nfserr_bad_xdr;
710
711 READ_BUF(o->len);
712 SAVEMEM(o->data, o->len);
713 return nfs_ok;
714 xdr_error:
715 return nfserr_bad_xdr;
716 }
717
718 static __be32
719 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
720 {
721 DECODE_HEAD;
722
723 memset(open->op_bmval, 0, sizeof(open->op_bmval));
724 open->op_iattr.ia_valid = 0;
725 open->op_openowner = NULL;
726
727 /* seqid, share_access, share_deny, clientid, ownerlen */
728 READ_BUF(4);
729 READ32(open->op_seqid);
730 status = nfsd4_decode_share_access(argp, &open->op_share_access);
731 if (status)
732 goto xdr_error;
733 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
734 if (status)
735 goto xdr_error;
736 READ_BUF(sizeof(clientid_t));
737 COPYMEM(&open->op_clientid, sizeof(clientid_t));
738 status = nfsd4_decode_opaque(argp, &open->op_owner);
739 if (status)
740 goto xdr_error;
741 READ_BUF(4);
742 READ32(open->op_create);
743 switch (open->op_create) {
744 case NFS4_OPEN_NOCREATE:
745 break;
746 case NFS4_OPEN_CREATE:
747 READ_BUF(4);
748 READ32(open->op_createmode);
749 switch (open->op_createmode) {
750 case NFS4_CREATE_UNCHECKED:
751 case NFS4_CREATE_GUARDED:
752 status = nfsd4_decode_fattr(argp, open->op_bmval,
753 &open->op_iattr, &open->op_acl);
754 if (status)
755 goto out;
756 break;
757 case NFS4_CREATE_EXCLUSIVE:
758 READ_BUF(8);
759 COPYMEM(open->op_verf.data, 8);
760 break;
761 case NFS4_CREATE_EXCLUSIVE4_1:
762 if (argp->minorversion < 1)
763 goto xdr_error;
764 READ_BUF(8);
765 COPYMEM(open->op_verf.data, 8);
766 status = nfsd4_decode_fattr(argp, open->op_bmval,
767 &open->op_iattr, &open->op_acl);
768 if (status)
769 goto out;
770 break;
771 default:
772 goto xdr_error;
773 }
774 break;
775 default:
776 goto xdr_error;
777 }
778
779 /* open_claim */
780 READ_BUF(4);
781 READ32(open->op_claim_type);
782 switch (open->op_claim_type) {
783 case NFS4_OPEN_CLAIM_NULL:
784 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
785 READ_BUF(4);
786 READ32(open->op_fname.len);
787 READ_BUF(open->op_fname.len);
788 SAVEMEM(open->op_fname.data, open->op_fname.len);
789 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
790 return status;
791 break;
792 case NFS4_OPEN_CLAIM_PREVIOUS:
793 READ_BUF(4);
794 READ32(open->op_delegate_type);
795 break;
796 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
797 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
798 if (status)
799 return status;
800 READ_BUF(4);
801 READ32(open->op_fname.len);
802 READ_BUF(open->op_fname.len);
803 SAVEMEM(open->op_fname.data, open->op_fname.len);
804 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
805 return status;
806 break;
807 case NFS4_OPEN_CLAIM_FH:
808 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
809 if (argp->minorversion < 1)
810 goto xdr_error;
811 /* void */
812 break;
813 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
814 if (argp->minorversion < 1)
815 goto xdr_error;
816 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
817 if (status)
818 return status;
819 break;
820 default:
821 goto xdr_error;
822 }
823
824 DECODE_TAIL;
825 }
826
827 static __be32
828 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
829 {
830 DECODE_HEAD;
831
832 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
833 if (status)
834 return status;
835 READ_BUF(4);
836 READ32(open_conf->oc_seqid);
837
838 DECODE_TAIL;
839 }
840
841 static __be32
842 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
843 {
844 DECODE_HEAD;
845
846 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
847 if (status)
848 return status;
849 READ_BUF(4);
850 READ32(open_down->od_seqid);
851 status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
852 if (status)
853 return status;
854 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
855 if (status)
856 return status;
857 DECODE_TAIL;
858 }
859
860 static __be32
861 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
862 {
863 DECODE_HEAD;
864
865 READ_BUF(4);
866 READ32(putfh->pf_fhlen);
867 if (putfh->pf_fhlen > NFS4_FHSIZE)
868 goto xdr_error;
869 READ_BUF(putfh->pf_fhlen);
870 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
871
872 DECODE_TAIL;
873 }
874
875 static __be32
876 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
877 {
878 DECODE_HEAD;
879
880 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
881 if (status)
882 return status;
883 READ_BUF(12);
884 READ64(read->rd_offset);
885 READ32(read->rd_length);
886
887 DECODE_TAIL;
888 }
889
890 static __be32
891 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
892 {
893 DECODE_HEAD;
894
895 READ_BUF(24);
896 READ64(readdir->rd_cookie);
897 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
898 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
899 READ32(readdir->rd_maxcount);
900 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
901 goto out;
902
903 DECODE_TAIL;
904 }
905
906 static __be32
907 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
908 {
909 DECODE_HEAD;
910
911 READ_BUF(4);
912 READ32(remove->rm_namelen);
913 READ_BUF(remove->rm_namelen);
914 SAVEMEM(remove->rm_name, remove->rm_namelen);
915 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
916 return status;
917
918 DECODE_TAIL;
919 }
920
921 static __be32
922 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
923 {
924 DECODE_HEAD;
925
926 READ_BUF(4);
927 READ32(rename->rn_snamelen);
928 READ_BUF(rename->rn_snamelen + 4);
929 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
930 READ32(rename->rn_tnamelen);
931 READ_BUF(rename->rn_tnamelen);
932 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
933 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
934 return status;
935 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
936 return status;
937
938 DECODE_TAIL;
939 }
940
941 static __be32
942 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
943 {
944 DECODE_HEAD;
945
946 READ_BUF(sizeof(clientid_t));
947 COPYMEM(clientid, sizeof(clientid_t));
948
949 DECODE_TAIL;
950 }
951
952 static __be32
953 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
954 struct nfsd4_secinfo *secinfo)
955 {
956 DECODE_HEAD;
957
958 READ_BUF(4);
959 READ32(secinfo->si_namelen);
960 READ_BUF(secinfo->si_namelen);
961 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
962 status = check_filename(secinfo->si_name, secinfo->si_namelen,
963 nfserr_noent);
964 if (status)
965 return status;
966 DECODE_TAIL;
967 }
968
969 static __be32
970 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
971 struct nfsd4_secinfo_no_name *sin)
972 {
973 DECODE_HEAD;
974
975 READ_BUF(4);
976 READ32(sin->sin_style);
977 DECODE_TAIL;
978 }
979
980 static __be32
981 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
982 {
983 __be32 status;
984
985 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
986 if (status)
987 return status;
988 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
989 &setattr->sa_acl);
990 }
991
992 static __be32
993 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
994 {
995 DECODE_HEAD;
996
997 READ_BUF(8);
998 COPYMEM(setclientid->se_verf.data, 8);
999
1000 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1001 if (status)
1002 return nfserr_bad_xdr;
1003 READ_BUF(8);
1004 READ32(setclientid->se_callback_prog);
1005 READ32(setclientid->se_callback_netid_len);
1006
1007 READ_BUF(setclientid->se_callback_netid_len + 4);
1008 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1009 READ32(setclientid->se_callback_addr_len);
1010
1011 READ_BUF(setclientid->se_callback_addr_len + 4);
1012 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1013 READ32(setclientid->se_callback_ident);
1014
1015 DECODE_TAIL;
1016 }
1017
1018 static __be32
1019 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1020 {
1021 DECODE_HEAD;
1022
1023 READ_BUF(8 + sizeof(nfs4_verifier));
1024 COPYMEM(&scd_c->sc_clientid, 8);
1025 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1026
1027 DECODE_TAIL;
1028 }
1029
1030 /* Also used for NVERIFY */
1031 static __be32
1032 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1033 {
1034 #if 0
1035 struct nfsd4_compoundargs save = {
1036 .p = argp->p,
1037 .end = argp->end,
1038 .rqstp = argp->rqstp,
1039 };
1040 u32 ve_bmval[2];
1041 struct iattr ve_iattr; /* request */
1042 struct nfs4_acl *ve_acl; /* request */
1043 #endif
1044 DECODE_HEAD;
1045
1046 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1047 goto out;
1048
1049 /* For convenience's sake, we compare raw xdr'd attributes in
1050 * nfsd4_proc_verify; however we still decode here just to return
1051 * correct error in case of bad xdr. */
1052 #if 0
1053 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1054 if (status == nfserr_inval) {
1055 status = nfserrno(status);
1056 goto out;
1057 }
1058 #endif
1059 READ_BUF(4);
1060 READ32(verify->ve_attrlen);
1061 READ_BUF(verify->ve_attrlen);
1062 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1063
1064 DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1069 {
1070 int avail;
1071 int v;
1072 int len;
1073 DECODE_HEAD;
1074
1075 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1076 if (status)
1077 return status;
1078 READ_BUF(16);
1079 READ64(write->wr_offset);
1080 READ32(write->wr_stable_how);
1081 if (write->wr_stable_how > 2)
1082 goto xdr_error;
1083 READ32(write->wr_buflen);
1084
1085 /* Sorry .. no magic macros for this.. *
1086 * READ_BUF(write->wr_buflen);
1087 * SAVEMEM(write->wr_buf, write->wr_buflen);
1088 */
1089 avail = (char*)argp->end - (char*)argp->p;
1090 if (avail + argp->pagelen < write->wr_buflen) {
1091 dprintk("NFSD: xdr error (%s:%d)\n",
1092 __FILE__, __LINE__);
1093 goto xdr_error;
1094 }
1095 argp->rqstp->rq_vec[0].iov_base = p;
1096 argp->rqstp->rq_vec[0].iov_len = avail;
1097 v = 0;
1098 len = write->wr_buflen;
1099 while (len > argp->rqstp->rq_vec[v].iov_len) {
1100 len -= argp->rqstp->rq_vec[v].iov_len;
1101 v++;
1102 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1103 argp->pagelist++;
1104 if (argp->pagelen >= PAGE_SIZE) {
1105 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1106 argp->pagelen -= PAGE_SIZE;
1107 } else {
1108 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1109 argp->pagelen -= len;
1110 }
1111 }
1112 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1113 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1114 argp->rqstp->rq_vec[v].iov_len = len;
1115 write->wr_vlen = v+1;
1116
1117 DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1122 {
1123 DECODE_HEAD;
1124
1125 READ_BUF(12);
1126 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1127 READ32(rlockowner->rl_owner.len);
1128 READ_BUF(rlockowner->rl_owner.len);
1129 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1130
1131 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1132 return nfserr_inval;
1133 DECODE_TAIL;
1134 }
1135
1136 static __be32
1137 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1138 struct nfsd4_exchange_id *exid)
1139 {
1140 int dummy, tmp;
1141 DECODE_HEAD;
1142
1143 READ_BUF(NFS4_VERIFIER_SIZE);
1144 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1145
1146 status = nfsd4_decode_opaque(argp, &exid->clname);
1147 if (status)
1148 return nfserr_bad_xdr;
1149
1150 READ_BUF(4);
1151 READ32(exid->flags);
1152
1153 /* Ignore state_protect4_a */
1154 READ_BUF(4);
1155 READ32(exid->spa_how);
1156 switch (exid->spa_how) {
1157 case SP4_NONE:
1158 break;
1159 case SP4_MACH_CRED:
1160 /* spo_must_enforce */
1161 READ_BUF(4);
1162 READ32(dummy);
1163 READ_BUF(dummy * 4);
1164 p += dummy;
1165
1166 /* spo_must_allow */
1167 READ_BUF(4);
1168 READ32(dummy);
1169 READ_BUF(dummy * 4);
1170 p += dummy;
1171 break;
1172 case SP4_SSV:
1173 /* ssp_ops */
1174 READ_BUF(4);
1175 READ32(dummy);
1176 READ_BUF(dummy * 4);
1177 p += dummy;
1178
1179 READ_BUF(4);
1180 READ32(dummy);
1181 READ_BUF(dummy * 4);
1182 p += dummy;
1183
1184 /* ssp_hash_algs<> */
1185 READ_BUF(4);
1186 READ32(tmp);
1187 while (tmp--) {
1188 READ_BUF(4);
1189 READ32(dummy);
1190 READ_BUF(dummy);
1191 p += XDR_QUADLEN(dummy);
1192 }
1193
1194 /* ssp_encr_algs<> */
1195 READ_BUF(4);
1196 READ32(tmp);
1197 while (tmp--) {
1198 READ_BUF(4);
1199 READ32(dummy);
1200 READ_BUF(dummy);
1201 p += XDR_QUADLEN(dummy);
1202 }
1203
1204 /* ssp_window and ssp_num_gss_handles */
1205 READ_BUF(8);
1206 READ32(dummy);
1207 READ32(dummy);
1208 break;
1209 default:
1210 goto xdr_error;
1211 }
1212
1213 /* Ignore Implementation ID */
1214 READ_BUF(4); /* nfs_impl_id4 array length */
1215 READ32(dummy);
1216
1217 if (dummy > 1)
1218 goto xdr_error;
1219
1220 if (dummy == 1) {
1221 /* nii_domain */
1222 READ_BUF(4);
1223 READ32(dummy);
1224 READ_BUF(dummy);
1225 p += XDR_QUADLEN(dummy);
1226
1227 /* nii_name */
1228 READ_BUF(4);
1229 READ32(dummy);
1230 READ_BUF(dummy);
1231 p += XDR_QUADLEN(dummy);
1232
1233 /* nii_date */
1234 READ_BUF(12);
1235 p += 3;
1236 }
1237 DECODE_TAIL;
1238 }
1239
1240 static __be32
1241 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1242 struct nfsd4_create_session *sess)
1243 {
1244 DECODE_HEAD;
1245
1246 u32 dummy;
1247 char *machine_name;
1248 int i;
1249 int nr_secflavs;
1250
1251 READ_BUF(16);
1252 COPYMEM(&sess->clientid, 8);
1253 READ32(sess->seqid);
1254 READ32(sess->flags);
1255
1256 /* Fore channel attrs */
1257 READ_BUF(28);
1258 READ32(dummy); /* headerpadsz is always 0 */
1259 READ32(sess->fore_channel.maxreq_sz);
1260 READ32(sess->fore_channel.maxresp_sz);
1261 READ32(sess->fore_channel.maxresp_cached);
1262 READ32(sess->fore_channel.maxops);
1263 READ32(sess->fore_channel.maxreqs);
1264 READ32(sess->fore_channel.nr_rdma_attrs);
1265 if (sess->fore_channel.nr_rdma_attrs == 1) {
1266 READ_BUF(4);
1267 READ32(sess->fore_channel.rdma_attrs);
1268 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1269 dprintk("Too many fore channel attr bitmaps!\n");
1270 goto xdr_error;
1271 }
1272
1273 /* Back channel attrs */
1274 READ_BUF(28);
1275 READ32(dummy); /* headerpadsz is always 0 */
1276 READ32(sess->back_channel.maxreq_sz);
1277 READ32(sess->back_channel.maxresp_sz);
1278 READ32(sess->back_channel.maxresp_cached);
1279 READ32(sess->back_channel.maxops);
1280 READ32(sess->back_channel.maxreqs);
1281 READ32(sess->back_channel.nr_rdma_attrs);
1282 if (sess->back_channel.nr_rdma_attrs == 1) {
1283 READ_BUF(4);
1284 READ32(sess->back_channel.rdma_attrs);
1285 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1286 dprintk("Too many back channel attr bitmaps!\n");
1287 goto xdr_error;
1288 }
1289
1290 READ_BUF(8);
1291 READ32(sess->callback_prog);
1292
1293 /* callback_sec_params4 */
1294 READ32(nr_secflavs);
1295 for (i = 0; i < nr_secflavs; ++i) {
1296 READ_BUF(4);
1297 READ32(dummy);
1298 switch (dummy) {
1299 case RPC_AUTH_NULL:
1300 /* Nothing to read */
1301 break;
1302 case RPC_AUTH_UNIX:
1303 READ_BUF(8);
1304 /* stamp */
1305 READ32(dummy);
1306
1307 /* machine name */
1308 READ32(dummy);
1309 READ_BUF(dummy);
1310 SAVEMEM(machine_name, dummy);
1311
1312 /* uid, gid */
1313 READ_BUF(8);
1314 READ32(sess->uid);
1315 READ32(sess->gid);
1316
1317 /* more gids */
1318 READ_BUF(4);
1319 READ32(dummy);
1320 READ_BUF(dummy * 4);
1321 break;
1322 case RPC_AUTH_GSS:
1323 dprintk("RPC_AUTH_GSS callback secflavor "
1324 "not supported!\n");
1325 READ_BUF(8);
1326 /* gcbp_service */
1327 READ32(dummy);
1328 /* gcbp_handle_from_server */
1329 READ32(dummy);
1330 READ_BUF(dummy);
1331 p += XDR_QUADLEN(dummy);
1332 /* gcbp_handle_from_client */
1333 READ_BUF(4);
1334 READ32(dummy);
1335 READ_BUF(dummy);
1336 break;
1337 default:
1338 dprintk("Illegal callback secflavor\n");
1339 return nfserr_inval;
1340 }
1341 }
1342 DECODE_TAIL;
1343 }
1344
1345 static __be32
1346 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1347 struct nfsd4_destroy_session *destroy_session)
1348 {
1349 DECODE_HEAD;
1350 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1351 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1352
1353 DECODE_TAIL;
1354 }
1355
1356 static __be32
1357 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1358 struct nfsd4_free_stateid *free_stateid)
1359 {
1360 DECODE_HEAD;
1361
1362 READ_BUF(sizeof(stateid_t));
1363 READ32(free_stateid->fr_stateid.si_generation);
1364 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1365
1366 DECODE_TAIL;
1367 }
1368
1369 static __be32
1370 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1371 struct nfsd4_sequence *seq)
1372 {
1373 DECODE_HEAD;
1374
1375 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1376 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1377 READ32(seq->seqid);
1378 READ32(seq->slotid);
1379 READ32(seq->maxslots);
1380 READ32(seq->cachethis);
1381
1382 DECODE_TAIL;
1383 }
1384
1385 static __be32
1386 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1387 {
1388 unsigned int nbytes;
1389 stateid_t si;
1390 int i;
1391 __be32 *p;
1392 __be32 status;
1393
1394 READ_BUF(4);
1395 test_stateid->ts_num_ids = ntohl(*p++);
1396
1397 nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1398 if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1399 goto xdr_error;
1400
1401 test_stateid->ts_saved_args = argp;
1402 save_buf(argp, &test_stateid->ts_savedp);
1403
1404 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1405 status = nfsd4_decode_stateid(argp, &si);
1406 if (status)
1407 return status;
1408 }
1409
1410 status = 0;
1411 out:
1412 return status;
1413 xdr_error:
1414 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1415 status = nfserr_bad_xdr;
1416 goto out;
1417 }
1418
1419 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1420 {
1421 DECODE_HEAD;
1422
1423 READ_BUF(8);
1424 COPYMEM(&dc->clientid, 8);
1425
1426 DECODE_TAIL;
1427 }
1428
1429 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1430 {
1431 DECODE_HEAD;
1432
1433 READ_BUF(4);
1434 READ32(rc->rca_one_fs);
1435
1436 DECODE_TAIL;
1437 }
1438
1439 static __be32
1440 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1441 {
1442 return nfs_ok;
1443 }
1444
1445 static __be32
1446 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1447 {
1448 return nfserr_notsupp;
1449 }
1450
1451 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1452
1453 static nfsd4_dec nfsd4_dec_ops[] = {
1454 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1455 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1456 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1457 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1458 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1459 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1460 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1461 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1462 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1463 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1464 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1465 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1466 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1467 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1468 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1469 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1470 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1471 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1472 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1473 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1474 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_noop,
1475 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1476 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1477 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1478 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1479 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1480 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1481 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1482 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1483 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1484 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1485 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1486 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1487 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1488 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1489 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1490 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1491 };
1492
1493 static nfsd4_dec nfsd41_dec_ops[] = {
1494 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1495 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1496 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1497 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1498 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1499 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1500 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1501 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1502 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1503 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1504 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1505 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1506 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1507 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1508 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1509 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1510 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1511 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_notsupp,
1512 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1513 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1514 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1515 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1516 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1517 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1518 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1519 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1520 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1521 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_notsupp,
1522 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1523 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1524 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1525 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1526 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1527 [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1528 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1529 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1530 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp,
1531
1532 /* new operations for NFSv4.1 */
1533 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp,
1534 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1535 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1536 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1537 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1538 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1539 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1540 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1541 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1542 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1543 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1544 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1545 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1546 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1547 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1548 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1549 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1550 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1551 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1552 };
1553
1554 struct nfsd4_minorversion_ops {
1555 nfsd4_dec *decoders;
1556 int nops;
1557 };
1558
1559 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1560 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1561 [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1562 };
1563
1564 static __be32
1565 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1566 {
1567 DECODE_HEAD;
1568 struct nfsd4_op *op;
1569 struct nfsd4_minorversion_ops *ops;
1570 bool cachethis = false;
1571 int i;
1572
1573 /*
1574 * XXX: According to spec, we should check the tag
1575 * for UTF-8 compliance. I'm postponing this for
1576 * now because it seems that some clients do use
1577 * binary tags.
1578 */
1579 READ_BUF(4);
1580 READ32(argp->taglen);
1581 READ_BUF(argp->taglen + 8);
1582 SAVEMEM(argp->tag, argp->taglen);
1583 READ32(argp->minorversion);
1584 READ32(argp->opcnt);
1585
1586 if (argp->taglen > NFSD4_MAX_TAGLEN)
1587 goto xdr_error;
1588 if (argp->opcnt > 100)
1589 goto xdr_error;
1590
1591 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1592 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1593 if (!argp->ops) {
1594 argp->ops = argp->iops;
1595 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1596 goto xdr_error;
1597 }
1598 }
1599
1600 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1601 argp->opcnt = 0;
1602
1603 ops = &nfsd4_minorversion[argp->minorversion];
1604 for (i = 0; i < argp->opcnt; i++) {
1605 op = &argp->ops[i];
1606 op->replay = NULL;
1607
1608 /*
1609 * We can't use READ_BUF() here because we need to handle
1610 * a missing opcode as an OP_WRITE + 1. So we need to check
1611 * to see if we're truly at the end of our buffer or if there
1612 * is another page we need to flip to.
1613 */
1614
1615 if (argp->p == argp->end) {
1616 if (argp->pagelen < 4) {
1617 /* There isn't an opcode still on the wire */
1618 op->opnum = OP_WRITE + 1;
1619 op->status = nfserr_bad_xdr;
1620 argp->opcnt = i+1;
1621 break;
1622 }
1623
1624 /*
1625 * False alarm. We just hit a page boundary, but there
1626 * is still data available. Move pointer across page
1627 * boundary. *snip from READ_BUF*
1628 */
1629 argp->p = page_address(argp->pagelist[0]);
1630 argp->pagelist++;
1631 if (argp->pagelen < PAGE_SIZE) {
1632 argp->end = argp->p + (argp->pagelen>>2);
1633 argp->pagelen = 0;
1634 } else {
1635 argp->end = argp->p + (PAGE_SIZE>>2);
1636 argp->pagelen -= PAGE_SIZE;
1637 }
1638 }
1639 op->opnum = ntohl(*argp->p++);
1640
1641 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1642 op->status = ops->decoders[op->opnum](argp, &op->u);
1643 else {
1644 op->opnum = OP_ILLEGAL;
1645 op->status = nfserr_op_illegal;
1646 }
1647
1648 if (op->status) {
1649 argp->opcnt = i+1;
1650 break;
1651 }
1652 /*
1653 * We'll try to cache the result in the DRC if any one
1654 * op in the compound wants to be cached:
1655 */
1656 cachethis |= nfsd4_cache_this_op(op);
1657 }
1658 /* Sessions make the DRC unnecessary: */
1659 if (argp->minorversion)
1660 cachethis = false;
1661 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1662
1663 DECODE_TAIL;
1664 }
1665
1666 #define WRITE32(n) *p++ = htonl(n)
1667 #define WRITE64(n) do { \
1668 *p++ = htonl((u32)((n) >> 32)); \
1669 *p++ = htonl((u32)(n)); \
1670 } while (0)
1671 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1672 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1673 memcpy(p, ptr, nbytes); \
1674 p += XDR_QUADLEN(nbytes); \
1675 }} while (0)
1676
1677 static void write32(__be32 **p, u32 n)
1678 {
1679 *(*p)++ = n;
1680 }
1681
1682 static void write64(__be32 **p, u64 n)
1683 {
1684 write32(p, (u32)(n >> 32));
1685 write32(p, (u32)n);
1686 }
1687
1688 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1689 {
1690 if (IS_I_VERSION(inode)) {
1691 write64(p, inode->i_version);
1692 } else {
1693 write32(p, stat->ctime.tv_sec);
1694 write32(p, stat->ctime.tv_nsec);
1695 }
1696 }
1697
1698 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1699 {
1700 write32(p, c->atomic);
1701 if (c->change_supported) {
1702 write64(p, c->before_change);
1703 write64(p, c->after_change);
1704 } else {
1705 write32(p, c->before_ctime_sec);
1706 write32(p, c->before_ctime_nsec);
1707 write32(p, c->after_ctime_sec);
1708 write32(p, c->after_ctime_nsec);
1709 }
1710 }
1711
1712 #define RESERVE_SPACE(nbytes) do { \
1713 p = resp->p; \
1714 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1715 } while (0)
1716 #define ADJUST_ARGS() resp->p = p
1717
1718 /*
1719 * Header routine to setup seqid operation replay cache
1720 */
1721 #define ENCODE_SEQID_OP_HEAD \
1722 __be32 *save; \
1723 \
1724 save = resp->p;
1725
1726 /*
1727 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1728 * is where sequence id's are incremented, and the replay cache is filled.
1729 * Note that we increment sequence id's here, at the last moment, so we're sure
1730 * we know whether the error to be returned is a sequence id mutating error.
1731 */
1732
1733 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1734 {
1735 struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1736
1737 if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1738 stateowner->so_seqid++;
1739 stateowner->so_replay.rp_status = nfserr;
1740 stateowner->so_replay.rp_buflen =
1741 (char *)resp->p - (char *)save;
1742 memcpy(stateowner->so_replay.rp_buf, save,
1743 stateowner->so_replay.rp_buflen);
1744 nfsd4_purge_closed_stateid(stateowner);
1745 }
1746 }
1747
1748 /* Encode as an array of strings the string given with components
1749 * separated @sep.
1750 */
1751 static __be32 nfsd4_encode_components(char sep, char *components,
1752 __be32 **pp, int *buflen)
1753 {
1754 __be32 *p = *pp;
1755 __be32 *countp = p;
1756 int strlen, count=0;
1757 char *str, *end;
1758
1759 dprintk("nfsd4_encode_components(%s)\n", components);
1760 if ((*buflen -= 4) < 0)
1761 return nfserr_resource;
1762 WRITE32(0); /* We will fill this in with @count later */
1763 end = str = components;
1764 while (*end) {
1765 for (; *end && (*end != sep); end++)
1766 ; /* Point to end of component */
1767 strlen = end - str;
1768 if (strlen) {
1769 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1770 return nfserr_resource;
1771 WRITE32(strlen);
1772 WRITEMEM(str, strlen);
1773 count++;
1774 }
1775 else
1776 end++;
1777 str = end;
1778 }
1779 *pp = p;
1780 p = countp;
1781 WRITE32(count);
1782 return 0;
1783 }
1784
1785 /*
1786 * encode a location element of a fs_locations structure
1787 */
1788 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1789 __be32 **pp, int *buflen)
1790 {
1791 __be32 status;
1792 __be32 *p = *pp;
1793
1794 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1795 if (status)
1796 return status;
1797 status = nfsd4_encode_components('/', location->path, &p, buflen);
1798 if (status)
1799 return status;
1800 *pp = p;
1801 return 0;
1802 }
1803
1804 /*
1805 * Encode a path in RFC3530 'pathname4' format
1806 */
1807 static __be32 nfsd4_encode_path(const struct path *root,
1808 const struct path *path, __be32 **pp, int *buflen)
1809 {
1810 struct path cur = {
1811 .mnt = path->mnt,
1812 .dentry = path->dentry,
1813 };
1814 __be32 *p = *pp;
1815 struct dentry **components = NULL;
1816 unsigned int ncomponents = 0;
1817 __be32 err = nfserr_jukebox;
1818
1819 dprintk("nfsd4_encode_components(");
1820
1821 path_get(&cur);
1822 /* First walk the path up to the nfsd root, and store the
1823 * dentries/path components in an array.
1824 */
1825 for (;;) {
1826 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1827 break;
1828 if (cur.dentry == cur.mnt->mnt_root) {
1829 if (follow_up(&cur))
1830 continue;
1831 goto out_free;
1832 }
1833 if ((ncomponents & 15) == 0) {
1834 struct dentry **new;
1835 new = krealloc(components,
1836 sizeof(*new) * (ncomponents + 16),
1837 GFP_KERNEL);
1838 if (!new)
1839 goto out_free;
1840 components = new;
1841 }
1842 components[ncomponents++] = cur.dentry;
1843 cur.dentry = dget_parent(cur.dentry);
1844 }
1845
1846 *buflen -= 4;
1847 if (*buflen < 0)
1848 goto out_free;
1849 WRITE32(ncomponents);
1850
1851 while (ncomponents) {
1852 struct dentry *dentry = components[ncomponents - 1];
1853 unsigned int len = dentry->d_name.len;
1854
1855 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1856 if (*buflen < 0)
1857 goto out_free;
1858 WRITE32(len);
1859 WRITEMEM(dentry->d_name.name, len);
1860 dprintk("/%s", dentry->d_name.name);
1861 dput(dentry);
1862 ncomponents--;
1863 }
1864
1865 *pp = p;
1866 err = 0;
1867 out_free:
1868 dprintk(")\n");
1869 while (ncomponents)
1870 dput(components[--ncomponents]);
1871 kfree(components);
1872 path_put(&cur);
1873 return err;
1874 }
1875
1876 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1877 const struct path *path, __be32 **pp, int *buflen)
1878 {
1879 struct svc_export *exp_ps;
1880 __be32 res;
1881
1882 exp_ps = rqst_find_fsidzero_export(rqstp);
1883 if (IS_ERR(exp_ps))
1884 return nfserrno(PTR_ERR(exp_ps));
1885 res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1886 exp_put(exp_ps);
1887 return res;
1888 }
1889
1890 /*
1891 * encode a fs_locations structure
1892 */
1893 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1894 struct svc_export *exp,
1895 __be32 **pp, int *buflen)
1896 {
1897 __be32 status;
1898 int i;
1899 __be32 *p = *pp;
1900 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1901
1902 status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1903 if (status)
1904 return status;
1905 if ((*buflen -= 4) < 0)
1906 return nfserr_resource;
1907 WRITE32(fslocs->locations_count);
1908 for (i=0; i<fslocs->locations_count; i++) {
1909 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1910 &p, buflen);
1911 if (status)
1912 return status;
1913 }
1914 *pp = p;
1915 return 0;
1916 }
1917
1918 static u32 nfs4_file_type(umode_t mode)
1919 {
1920 switch (mode & S_IFMT) {
1921 case S_IFIFO: return NF4FIFO;
1922 case S_IFCHR: return NF4CHR;
1923 case S_IFDIR: return NF4DIR;
1924 case S_IFBLK: return NF4BLK;
1925 case S_IFLNK: return NF4LNK;
1926 case S_IFREG: return NF4REG;
1927 case S_IFSOCK: return NF4SOCK;
1928 default: return NF4BAD;
1929 };
1930 }
1931
1932 static __be32
1933 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1934 __be32 **p, int *buflen)
1935 {
1936 int status;
1937
1938 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1939 return nfserr_resource;
1940 if (whotype != NFS4_ACL_WHO_NAMED)
1941 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1942 else if (group)
1943 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1944 else
1945 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1946 if (status < 0)
1947 return nfserrno(status);
1948 *p = xdr_encode_opaque(*p, NULL, status);
1949 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1950 BUG_ON(*buflen < 0);
1951 return 0;
1952 }
1953
1954 static inline __be32
1955 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1956 {
1957 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1958 }
1959
1960 static inline __be32
1961 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1962 {
1963 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1964 }
1965
1966 static inline __be32
1967 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1968 __be32 **p, int *buflen)
1969 {
1970 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1971 }
1972
1973 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1974 FATTR4_WORD0_RDATTR_ERROR)
1975 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1976
1977 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1978 {
1979 /* As per referral draft: */
1980 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1981 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1982 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1983 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1984 *rdattr_err = NFSERR_MOVED;
1985 else
1986 return nfserr_moved;
1987 }
1988 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1989 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1990 return 0;
1991 }
1992
1993 /*
1994 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1995 * ourselves.
1996 *
1997 * @countp is the buffer size in _words_; upon successful return this becomes
1998 * replaced with the number of words written.
1999 */
2000 __be32
2001 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2002 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2003 struct svc_rqst *rqstp, int ignore_crossmnt)
2004 {
2005 u32 bmval0 = bmval[0];
2006 u32 bmval1 = bmval[1];
2007 u32 bmval2 = bmval[2];
2008 struct kstat stat;
2009 struct svc_fh tempfh;
2010 struct kstatfs statfs;
2011 int buflen = *countp << 2;
2012 __be32 *attrlenp;
2013 u32 dummy;
2014 u64 dummy64;
2015 u32 rdattr_err = 0;
2016 __be32 *p = buffer;
2017 __be32 status;
2018 int err;
2019 int aclsupport = 0;
2020 struct nfs4_acl *acl = NULL;
2021 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2022 u32 minorversion = resp->cstate.minorversion;
2023 struct path path = {
2024 .mnt = exp->ex_path.mnt,
2025 .dentry = dentry,
2026 };
2027
2028 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2029 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2030 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2031 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2032
2033 if (exp->ex_fslocs.migrated) {
2034 BUG_ON(bmval[2]);
2035 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2036 if (status)
2037 goto out;
2038 }
2039
2040 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2041 if (err)
2042 goto out_nfserr;
2043 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2044 FATTR4_WORD0_MAXNAME)) ||
2045 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2046 FATTR4_WORD1_SPACE_TOTAL))) {
2047 err = vfs_statfs(&path, &statfs);
2048 if (err)
2049 goto out_nfserr;
2050 }
2051 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2052 fh_init(&tempfh, NFS4_FHSIZE);
2053 status = fh_compose(&tempfh, exp, dentry, NULL);
2054 if (status)
2055 goto out;
2056 fhp = &tempfh;
2057 }
2058 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2059 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2060 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2061 aclsupport = (err == 0);
2062 if (bmval0 & FATTR4_WORD0_ACL) {
2063 if (err == -EOPNOTSUPP)
2064 bmval0 &= ~FATTR4_WORD0_ACL;
2065 else if (err == -EINVAL) {
2066 status = nfserr_attrnotsupp;
2067 goto out;
2068 } else if (err != 0)
2069 goto out_nfserr;
2070 }
2071 }
2072
2073 if (bmval2) {
2074 if ((buflen -= 16) < 0)
2075 goto out_resource;
2076 WRITE32(3);
2077 WRITE32(bmval0);
2078 WRITE32(bmval1);
2079 WRITE32(bmval2);
2080 } else if (bmval1) {
2081 if ((buflen -= 12) < 0)
2082 goto out_resource;
2083 WRITE32(2);
2084 WRITE32(bmval0);
2085 WRITE32(bmval1);
2086 } else {
2087 if ((buflen -= 8) < 0)
2088 goto out_resource;
2089 WRITE32(1);
2090 WRITE32(bmval0);
2091 }
2092 attrlenp = p++; /* to be backfilled later */
2093
2094 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2095 u32 word0 = nfsd_suppattrs0(minorversion);
2096 u32 word1 = nfsd_suppattrs1(minorversion);
2097 u32 word2 = nfsd_suppattrs2(minorversion);
2098
2099 if (!aclsupport)
2100 word0 &= ~FATTR4_WORD0_ACL;
2101 if (!word2) {
2102 if ((buflen -= 12) < 0)
2103 goto out_resource;
2104 WRITE32(2);
2105 WRITE32(word0);
2106 WRITE32(word1);
2107 } else {
2108 if ((buflen -= 16) < 0)
2109 goto out_resource;
2110 WRITE32(3);
2111 WRITE32(word0);
2112 WRITE32(word1);
2113 WRITE32(word2);
2114 }
2115 }
2116 if (bmval0 & FATTR4_WORD0_TYPE) {
2117 if ((buflen -= 4) < 0)
2118 goto out_resource;
2119 dummy = nfs4_file_type(stat.mode);
2120 if (dummy == NF4BAD)
2121 goto out_serverfault;
2122 WRITE32(dummy);
2123 }
2124 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2125 if ((buflen -= 4) < 0)
2126 goto out_resource;
2127 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2128 WRITE32(NFS4_FH_PERSISTENT);
2129 else
2130 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2131 }
2132 if (bmval0 & FATTR4_WORD0_CHANGE) {
2133 if ((buflen -= 8) < 0)
2134 goto out_resource;
2135 write_change(&p, &stat, dentry->d_inode);
2136 }
2137 if (bmval0 & FATTR4_WORD0_SIZE) {
2138 if ((buflen -= 8) < 0)
2139 goto out_resource;
2140 WRITE64(stat.size);
2141 }
2142 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2143 if ((buflen -= 4) < 0)
2144 goto out_resource;
2145 WRITE32(1);
2146 }
2147 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2148 if ((buflen -= 4) < 0)
2149 goto out_resource;
2150 WRITE32(1);
2151 }
2152 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2153 if ((buflen -= 4) < 0)
2154 goto out_resource;
2155 WRITE32(0);
2156 }
2157 if (bmval0 & FATTR4_WORD0_FSID) {
2158 if ((buflen -= 16) < 0)
2159 goto out_resource;
2160 if (exp->ex_fslocs.migrated) {
2161 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2162 WRITE64(NFS4_REFERRAL_FSID_MINOR);
2163 } else switch(fsid_source(fhp)) {
2164 case FSIDSOURCE_FSID:
2165 WRITE64((u64)exp->ex_fsid);
2166 WRITE64((u64)0);
2167 break;
2168 case FSIDSOURCE_DEV:
2169 WRITE32(0);
2170 WRITE32(MAJOR(stat.dev));
2171 WRITE32(0);
2172 WRITE32(MINOR(stat.dev));
2173 break;
2174 case FSIDSOURCE_UUID:
2175 WRITEMEM(exp->ex_uuid, 16);
2176 break;
2177 }
2178 }
2179 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2180 if ((buflen -= 4) < 0)
2181 goto out_resource;
2182 WRITE32(0);
2183 }
2184 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2185 if ((buflen -= 4) < 0)
2186 goto out_resource;
2187 WRITE32(nfsd4_lease);
2188 }
2189 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2190 if ((buflen -= 4) < 0)
2191 goto out_resource;
2192 WRITE32(rdattr_err);
2193 }
2194 if (bmval0 & FATTR4_WORD0_ACL) {
2195 struct nfs4_ace *ace;
2196
2197 if (acl == NULL) {
2198 if ((buflen -= 4) < 0)
2199 goto out_resource;
2200
2201 WRITE32(0);
2202 goto out_acl;
2203 }
2204 if ((buflen -= 4) < 0)
2205 goto out_resource;
2206 WRITE32(acl->naces);
2207
2208 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2209 if ((buflen -= 4*3) < 0)
2210 goto out_resource;
2211 WRITE32(ace->type);
2212 WRITE32(ace->flag);
2213 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2214 status = nfsd4_encode_aclname(rqstp, ace->whotype,
2215 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2216 &p, &buflen);
2217 if (status == nfserr_resource)
2218 goto out_resource;
2219 if (status)
2220 goto out;
2221 }
2222 }
2223 out_acl:
2224 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2225 if ((buflen -= 4) < 0)
2226 goto out_resource;
2227 WRITE32(aclsupport ?
2228 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2229 }
2230 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2231 if ((buflen -= 4) < 0)
2232 goto out_resource;
2233 WRITE32(1);
2234 }
2235 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2236 if ((buflen -= 4) < 0)
2237 goto out_resource;
2238 WRITE32(1);
2239 }
2240 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2241 if ((buflen -= 4) < 0)
2242 goto out_resource;
2243 WRITE32(1);
2244 }
2245 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2246 if ((buflen -= 4) < 0)
2247 goto out_resource;
2248 WRITE32(1);
2249 }
2250 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2251 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2252 if (buflen < 0)
2253 goto out_resource;
2254 WRITE32(fhp->fh_handle.fh_size);
2255 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2256 }
2257 if (bmval0 & FATTR4_WORD0_FILEID) {
2258 if ((buflen -= 8) < 0)
2259 goto out_resource;
2260 WRITE64(stat.ino);
2261 }
2262 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2263 if ((buflen -= 8) < 0)
2264 goto out_resource;
2265 WRITE64((u64) statfs.f_ffree);
2266 }
2267 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2268 if ((buflen -= 8) < 0)
2269 goto out_resource;
2270 WRITE64((u64) statfs.f_ffree);
2271 }
2272 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2273 if ((buflen -= 8) < 0)
2274 goto out_resource;
2275 WRITE64((u64) statfs.f_files);
2276 }
2277 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2278 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2279 if (status == nfserr_resource)
2280 goto out_resource;
2281 if (status)
2282 goto out;
2283 }
2284 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2285 if ((buflen -= 4) < 0)
2286 goto out_resource;
2287 WRITE32(1);
2288 }
2289 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2290 if ((buflen -= 8) < 0)
2291 goto out_resource;
2292 WRITE64(~(u64)0);
2293 }
2294 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2295 if ((buflen -= 4) < 0)
2296 goto out_resource;
2297 WRITE32(255);
2298 }
2299 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2300 if ((buflen -= 4) < 0)
2301 goto out_resource;
2302 WRITE32(statfs.f_namelen);
2303 }
2304 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2305 if ((buflen -= 8) < 0)
2306 goto out_resource;
2307 WRITE64((u64) svc_max_payload(rqstp));
2308 }
2309 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2310 if ((buflen -= 8) < 0)
2311 goto out_resource;
2312 WRITE64((u64) svc_max_payload(rqstp));
2313 }
2314 if (bmval1 & FATTR4_WORD1_MODE) {
2315 if ((buflen -= 4) < 0)
2316 goto out_resource;
2317 WRITE32(stat.mode & S_IALLUGO);
2318 }
2319 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2320 if ((buflen -= 4) < 0)
2321 goto out_resource;
2322 WRITE32(1);
2323 }
2324 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2325 if ((buflen -= 4) < 0)
2326 goto out_resource;
2327 WRITE32(stat.nlink);
2328 }
2329 if (bmval1 & FATTR4_WORD1_OWNER) {
2330 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2331 if (status == nfserr_resource)
2332 goto out_resource;
2333 if (status)
2334 goto out;
2335 }
2336 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2337 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2338 if (status == nfserr_resource)
2339 goto out_resource;
2340 if (status)
2341 goto out;
2342 }
2343 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2344 if ((buflen -= 8) < 0)
2345 goto out_resource;
2346 WRITE32((u32) MAJOR(stat.rdev));
2347 WRITE32((u32) MINOR(stat.rdev));
2348 }
2349 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2350 if ((buflen -= 8) < 0)
2351 goto out_resource;
2352 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2353 WRITE64(dummy64);
2354 }
2355 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2356 if ((buflen -= 8) < 0)
2357 goto out_resource;
2358 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2359 WRITE64(dummy64);
2360 }
2361 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2362 if ((buflen -= 8) < 0)
2363 goto out_resource;
2364 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2365 WRITE64(dummy64);
2366 }
2367 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2368 if ((buflen -= 8) < 0)
2369 goto out_resource;
2370 dummy64 = (u64)stat.blocks << 9;
2371 WRITE64(dummy64);
2372 }
2373 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2374 if ((buflen -= 12) < 0)
2375 goto out_resource;
2376 WRITE32(0);
2377 WRITE32(stat.atime.tv_sec);
2378 WRITE32(stat.atime.tv_nsec);
2379 }
2380 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2381 if ((buflen -= 12) < 0)
2382 goto out_resource;
2383 WRITE32(0);
2384 WRITE32(1);
2385 WRITE32(0);
2386 }
2387 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2388 if ((buflen -= 12) < 0)
2389 goto out_resource;
2390 WRITE32(0);
2391 WRITE32(stat.ctime.tv_sec);
2392 WRITE32(stat.ctime.tv_nsec);
2393 }
2394 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2395 if ((buflen -= 12) < 0)
2396 goto out_resource;
2397 WRITE32(0);
2398 WRITE32(stat.mtime.tv_sec);
2399 WRITE32(stat.mtime.tv_nsec);
2400 }
2401 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2402 if ((buflen -= 8) < 0)
2403 goto out_resource;
2404 /*
2405 * Get parent's attributes if not ignoring crossmount
2406 * and this is the root of a cross-mounted filesystem.
2407 */
2408 if (ignore_crossmnt == 0 &&
2409 dentry == exp->ex_path.mnt->mnt_root) {
2410 struct path path = exp->ex_path;
2411 path_get(&path);
2412 while (follow_up(&path)) {
2413 if (path.dentry != path.mnt->mnt_root)
2414 break;
2415 }
2416 err = vfs_getattr(path.mnt, path.dentry, &stat);
2417 path_put(&path);
2418 if (err)
2419 goto out_nfserr;
2420 }
2421 WRITE64(stat.ino);
2422 }
2423 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2424 WRITE32(3);
2425 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2426 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2427 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2428 }
2429
2430 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2431 *countp = p - buffer;
2432 status = nfs_ok;
2433
2434 out:
2435 kfree(acl);
2436 if (fhp == &tempfh)
2437 fh_put(&tempfh);
2438 return status;
2439 out_nfserr:
2440 status = nfserrno(err);
2441 goto out;
2442 out_resource:
2443 *countp = 0;
2444 status = nfserr_resource;
2445 goto out;
2446 out_serverfault:
2447 status = nfserr_serverfault;
2448 goto out;
2449 }
2450
2451 static inline int attributes_need_mount(u32 *bmval)
2452 {
2453 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2454 return 1;
2455 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2456 return 1;
2457 return 0;
2458 }
2459
2460 static __be32
2461 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2462 const char *name, int namlen, __be32 *p, int *buflen)
2463 {
2464 struct svc_export *exp = cd->rd_fhp->fh_export;
2465 struct dentry *dentry;
2466 __be32 nfserr;
2467 int ignore_crossmnt = 0;
2468
2469 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2470 if (IS_ERR(dentry))
2471 return nfserrno(PTR_ERR(dentry));
2472 if (!dentry->d_inode) {
2473 /*
2474 * nfsd_buffered_readdir drops the i_mutex between
2475 * readdir and calling this callback, leaving a window
2476 * where this directory entry could have gone away.
2477 */
2478 dput(dentry);
2479 return nfserr_noent;
2480 }
2481
2482 exp_get(exp);
2483 /*
2484 * In the case of a mountpoint, the client may be asking for
2485 * attributes that are only properties of the underlying filesystem
2486 * as opposed to the cross-mounted file system. In such a case,
2487 * we will not follow the cross mount and will fill the attribtutes
2488 * directly from the mountpoint dentry.
2489 */
2490 if (nfsd_mountpoint(dentry, exp)) {
2491 int err;
2492
2493 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2494 && !attributes_need_mount(cd->rd_bmval)) {
2495 ignore_crossmnt = 1;
2496 goto out_encode;
2497 }
2498 /*
2499 * Why the heck aren't we just using nfsd_lookup??
2500 * Different "."/".." handling? Something else?
2501 * At least, add a comment here to explain....
2502 */
2503 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2504 if (err) {
2505 nfserr = nfserrno(err);
2506 goto out_put;
2507 }
2508 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2509 if (nfserr)
2510 goto out_put;
2511
2512 }
2513 out_encode:
2514 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2515 cd->rd_rqstp, ignore_crossmnt);
2516 out_put:
2517 dput(dentry);
2518 exp_put(exp);
2519 return nfserr;
2520 }
2521
2522 static __be32 *
2523 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2524 {
2525 __be32 *attrlenp;
2526
2527 if (buflen < 6)
2528 return NULL;
2529 *p++ = htonl(2);
2530 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2531 *p++ = htonl(0); /* bmval1 */
2532
2533 attrlenp = p++;
2534 *p++ = nfserr; /* no htonl */
2535 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2536 return p;
2537 }
2538
2539 static int
2540 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2541 loff_t offset, u64 ino, unsigned int d_type)
2542 {
2543 struct readdir_cd *ccd = ccdv;
2544 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2545 int buflen;
2546 __be32 *p = cd->buffer;
2547 __be32 *cookiep;
2548 __be32 nfserr = nfserr_toosmall;
2549
2550 /* In nfsv4, "." and ".." never make it onto the wire.. */
2551 if (name && isdotent(name, namlen)) {
2552 cd->common.err = nfs_ok;
2553 return 0;
2554 }
2555
2556 if (cd->offset)
2557 xdr_encode_hyper(cd->offset, (u64) offset);
2558
2559 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2560 if (buflen < 0)
2561 goto fail;
2562
2563 *p++ = xdr_one; /* mark entry present */
2564 cookiep = p;
2565 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2566 p = xdr_encode_array(p, name, namlen); /* name length & name */
2567
2568 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2569 switch (nfserr) {
2570 case nfs_ok:
2571 p += buflen;
2572 break;
2573 case nfserr_resource:
2574 nfserr = nfserr_toosmall;
2575 goto fail;
2576 case nfserr_noent:
2577 goto skip_entry;
2578 default:
2579 /*
2580 * If the client requested the RDATTR_ERROR attribute,
2581 * we stuff the error code into this attribute
2582 * and continue. If this attribute was not requested,
2583 * then in accordance with the spec, we fail the
2584 * entire READDIR operation(!)
2585 */
2586 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2587 goto fail;
2588 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2589 if (p == NULL) {
2590 nfserr = nfserr_toosmall;
2591 goto fail;
2592 }
2593 }
2594 cd->buflen -= (p - cd->buffer);
2595 cd->buffer = p;
2596 cd->offset = cookiep;
2597 skip_entry:
2598 cd->common.err = nfs_ok;
2599 return 0;
2600 fail:
2601 cd->common.err = nfserr;
2602 return -EINVAL;
2603 }
2604
2605 static void
2606 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2607 {
2608 __be32 *p;
2609
2610 RESERVE_SPACE(sizeof(stateid_t));
2611 WRITE32(sid->si_generation);
2612 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2613 ADJUST_ARGS();
2614 }
2615
2616 static __be32
2617 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2618 {
2619 __be32 *p;
2620
2621 if (!nfserr) {
2622 RESERVE_SPACE(8);
2623 WRITE32(access->ac_supported);
2624 WRITE32(access->ac_resp_access);
2625 ADJUST_ARGS();
2626 }
2627 return nfserr;
2628 }
2629
2630 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2631 {
2632 __be32 *p;
2633
2634 if (!nfserr) {
2635 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2636 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2637 WRITE32(bcts->dir);
2638 /* XXX: ? */
2639 WRITE32(0);
2640 ADJUST_ARGS();
2641 }
2642 return nfserr;
2643 }
2644
2645 static __be32
2646 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2647 {
2648 ENCODE_SEQID_OP_HEAD;
2649
2650 if (!nfserr)
2651 nfsd4_encode_stateid(resp, &close->cl_stateid);
2652
2653 encode_seqid_op_tail(resp, save, nfserr);
2654 return nfserr;
2655 }
2656
2657
2658 static __be32
2659 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2660 {
2661 __be32 *p;
2662
2663 if (!nfserr) {
2664 RESERVE_SPACE(8);
2665 WRITEMEM(commit->co_verf.data, 8);
2666 ADJUST_ARGS();
2667 }
2668 return nfserr;
2669 }
2670
2671 static __be32
2672 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2673 {
2674 __be32 *p;
2675
2676 if (!nfserr) {
2677 RESERVE_SPACE(32);
2678 write_cinfo(&p, &create->cr_cinfo);
2679 WRITE32(2);
2680 WRITE32(create->cr_bmval[0]);
2681 WRITE32(create->cr_bmval[1]);
2682 ADJUST_ARGS();
2683 }
2684 return nfserr;
2685 }
2686
2687 static __be32
2688 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2689 {
2690 struct svc_fh *fhp = getattr->ga_fhp;
2691 int buflen;
2692
2693 if (nfserr)
2694 return nfserr;
2695
2696 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2697 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2698 resp->p, &buflen, getattr->ga_bmval,
2699 resp->rqstp, 0);
2700 if (!nfserr)
2701 resp->p += buflen;
2702 return nfserr;
2703 }
2704
2705 static __be32
2706 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2707 {
2708 struct svc_fh *fhp = *fhpp;
2709 unsigned int len;
2710 __be32 *p;
2711
2712 if (!nfserr) {
2713 len = fhp->fh_handle.fh_size;
2714 RESERVE_SPACE(len + 4);
2715 WRITE32(len);
2716 WRITEMEM(&fhp->fh_handle.fh_base, len);
2717 ADJUST_ARGS();
2718 }
2719 return nfserr;
2720 }
2721
2722 /*
2723 * Including all fields other than the name, a LOCK4denied structure requires
2724 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2725 */
2726 static void
2727 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2728 {
2729 struct xdr_netobj *conf = &ld->ld_owner;
2730 __be32 *p;
2731
2732 RESERVE_SPACE(32 + XDR_LEN(conf->len));
2733 WRITE64(ld->ld_start);
2734 WRITE64(ld->ld_length);
2735 WRITE32(ld->ld_type);
2736 if (conf->len) {
2737 WRITEMEM(&ld->ld_clientid, 8);
2738 WRITE32(conf->len);
2739 WRITEMEM(conf->data, conf->len);
2740 kfree(conf->data);
2741 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2742 WRITE64((u64)0); /* clientid */
2743 WRITE32(0); /* length of owner name */
2744 }
2745 ADJUST_ARGS();
2746 }
2747
2748 static __be32
2749 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2750 {
2751 ENCODE_SEQID_OP_HEAD;
2752
2753 if (!nfserr)
2754 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2755 else if (nfserr == nfserr_denied)
2756 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2757
2758 encode_seqid_op_tail(resp, save, nfserr);
2759 return nfserr;
2760 }
2761
2762 static __be32
2763 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2764 {
2765 if (nfserr == nfserr_denied)
2766 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2767 return nfserr;
2768 }
2769
2770 static __be32
2771 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2772 {
2773 ENCODE_SEQID_OP_HEAD;
2774
2775 if (!nfserr)
2776 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2777
2778 encode_seqid_op_tail(resp, save, nfserr);
2779 return nfserr;
2780 }
2781
2782
2783 static __be32
2784 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2785 {
2786 __be32 *p;
2787
2788 if (!nfserr) {
2789 RESERVE_SPACE(20);
2790 write_cinfo(&p, &link->li_cinfo);
2791 ADJUST_ARGS();
2792 }
2793 return nfserr;
2794 }
2795
2796
2797 static __be32
2798 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2799 {
2800 __be32 *p;
2801 ENCODE_SEQID_OP_HEAD;
2802
2803 if (nfserr)
2804 goto out;
2805
2806 nfsd4_encode_stateid(resp, &open->op_stateid);
2807 RESERVE_SPACE(40);
2808 write_cinfo(&p, &open->op_cinfo);
2809 WRITE32(open->op_rflags);
2810 WRITE32(2);
2811 WRITE32(open->op_bmval[0]);
2812 WRITE32(open->op_bmval[1]);
2813 WRITE32(open->op_delegate_type);
2814 ADJUST_ARGS();
2815
2816 switch (open->op_delegate_type) {
2817 case NFS4_OPEN_DELEGATE_NONE:
2818 break;
2819 case NFS4_OPEN_DELEGATE_READ:
2820 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2821 RESERVE_SPACE(20);
2822 WRITE32(open->op_recall);
2823
2824 /*
2825 * TODO: ACE's in delegations
2826 */
2827 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2828 WRITE32(0);
2829 WRITE32(0);
2830 WRITE32(0); /* XXX: is NULL principal ok? */
2831 ADJUST_ARGS();
2832 break;
2833 case NFS4_OPEN_DELEGATE_WRITE:
2834 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2835 RESERVE_SPACE(32);
2836 WRITE32(0);
2837
2838 /*
2839 * TODO: space_limit's in delegations
2840 */
2841 WRITE32(NFS4_LIMIT_SIZE);
2842 WRITE32(~(u32)0);
2843 WRITE32(~(u32)0);
2844
2845 /*
2846 * TODO: ACE's in delegations
2847 */
2848 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2849 WRITE32(0);
2850 WRITE32(0);
2851 WRITE32(0); /* XXX: is NULL principal ok? */
2852 ADJUST_ARGS();
2853 break;
2854 default:
2855 BUG();
2856 }
2857 /* XXX save filehandle here */
2858 out:
2859 encode_seqid_op_tail(resp, save, nfserr);
2860 return nfserr;
2861 }
2862
2863 static __be32
2864 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2865 {
2866 ENCODE_SEQID_OP_HEAD;
2867
2868 if (!nfserr)
2869 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2870
2871 encode_seqid_op_tail(resp, save, nfserr);
2872 return nfserr;
2873 }
2874
2875 static __be32
2876 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2877 {
2878 ENCODE_SEQID_OP_HEAD;
2879
2880 if (!nfserr)
2881 nfsd4_encode_stateid(resp, &od->od_stateid);
2882
2883 encode_seqid_op_tail(resp, save, nfserr);
2884 return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2889 struct nfsd4_read *read)
2890 {
2891 u32 eof;
2892 int v, pn;
2893 unsigned long maxcount;
2894 long len;
2895 __be32 *p;
2896
2897 if (nfserr)
2898 return nfserr;
2899 if (resp->xbuf->page_len)
2900 return nfserr_resource;
2901
2902 RESERVE_SPACE(8); /* eof flag and byte count */
2903
2904 maxcount = svc_max_payload(resp->rqstp);
2905 if (maxcount > read->rd_length)
2906 maxcount = read->rd_length;
2907
2908 len = maxcount;
2909 v = 0;
2910 while (len > 0) {
2911 pn = resp->rqstp->rq_resused++;
2912 resp->rqstp->rq_vec[v].iov_base =
2913 page_address(resp->rqstp->rq_respages[pn]);
2914 resp->rqstp->rq_vec[v].iov_len =
2915 len < PAGE_SIZE ? len : PAGE_SIZE;
2916 v++;
2917 len -= PAGE_SIZE;
2918 }
2919 read->rd_vlen = v;
2920
2921 nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2922 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2923 &maxcount);
2924
2925 if (nfserr)
2926 return nfserr;
2927 eof = (read->rd_offset + maxcount >=
2928 read->rd_fhp->fh_dentry->d_inode->i_size);
2929
2930 WRITE32(eof);
2931 WRITE32(maxcount);
2932 ADJUST_ARGS();
2933 resp->xbuf->head[0].iov_len = (char*)p
2934 - (char*)resp->xbuf->head[0].iov_base;
2935 resp->xbuf->page_len = maxcount;
2936
2937 /* Use rest of head for padding and remaining ops: */
2938 resp->xbuf->tail[0].iov_base = p;
2939 resp->xbuf->tail[0].iov_len = 0;
2940 if (maxcount&3) {
2941 RESERVE_SPACE(4);
2942 WRITE32(0);
2943 resp->xbuf->tail[0].iov_base += maxcount&3;
2944 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2945 ADJUST_ARGS();
2946 }
2947 return 0;
2948 }
2949
2950 static __be32
2951 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2952 {
2953 int maxcount;
2954 char *page;
2955 __be32 *p;
2956
2957 if (nfserr)
2958 return nfserr;
2959 if (resp->xbuf->page_len)
2960 return nfserr_resource;
2961
2962 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2963
2964 maxcount = PAGE_SIZE;
2965 RESERVE_SPACE(4);
2966
2967 /*
2968 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2969 * if they would overflow the buffer. Is this kosher in NFSv4? If
2970 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2971 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2972 */
2973 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2974 if (nfserr == nfserr_isdir)
2975 return nfserr_inval;
2976 if (nfserr)
2977 return nfserr;
2978
2979 WRITE32(maxcount);
2980 ADJUST_ARGS();
2981 resp->xbuf->head[0].iov_len = (char*)p
2982 - (char*)resp->xbuf->head[0].iov_base;
2983 resp->xbuf->page_len = maxcount;
2984
2985 /* Use rest of head for padding and remaining ops: */
2986 resp->xbuf->tail[0].iov_base = p;
2987 resp->xbuf->tail[0].iov_len = 0;
2988 if (maxcount&3) {
2989 RESERVE_SPACE(4);
2990 WRITE32(0);
2991 resp->xbuf->tail[0].iov_base += maxcount&3;
2992 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2993 ADJUST_ARGS();
2994 }
2995 return 0;
2996 }
2997
2998 static __be32
2999 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3000 {
3001 int maxcount;
3002 loff_t offset;
3003 __be32 *page, *savep, *tailbase;
3004 __be32 *p;
3005
3006 if (nfserr)
3007 return nfserr;
3008 if (resp->xbuf->page_len)
3009 return nfserr_resource;
3010
3011 RESERVE_SPACE(8); /* verifier */
3012 savep = p;
3013
3014 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3015 WRITE32(0);
3016 WRITE32(0);
3017 ADJUST_ARGS();
3018 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3019 tailbase = p;
3020
3021 maxcount = PAGE_SIZE;
3022 if (maxcount > readdir->rd_maxcount)
3023 maxcount = readdir->rd_maxcount;
3024
3025 /*
3026 * Convert from bytes to words, account for the two words already
3027 * written, make sure to leave two words at the end for the next
3028 * pointer and eof field.
3029 */
3030 maxcount = (maxcount >> 2) - 4;
3031 if (maxcount < 0) {
3032 nfserr = nfserr_toosmall;
3033 goto err_no_verf;
3034 }
3035
3036 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3037 readdir->common.err = 0;
3038 readdir->buflen = maxcount;
3039 readdir->buffer = page;
3040 readdir->offset = NULL;
3041
3042 offset = readdir->rd_cookie;
3043 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3044 &offset,
3045 &readdir->common, nfsd4_encode_dirent);
3046 if (nfserr == nfs_ok &&
3047 readdir->common.err == nfserr_toosmall &&
3048 readdir->buffer == page)
3049 nfserr = nfserr_toosmall;
3050 if (nfserr)
3051 goto err_no_verf;
3052
3053 if (readdir->offset)
3054 xdr_encode_hyper(readdir->offset, offset);
3055
3056 p = readdir->buffer;
3057 *p++ = 0; /* no more entries */
3058 *p++ = htonl(readdir->common.err == nfserr_eof);
3059 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3060 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3061
3062 /* Use rest of head for padding and remaining ops: */
3063 resp->xbuf->tail[0].iov_base = tailbase;
3064 resp->xbuf->tail[0].iov_len = 0;
3065 resp->p = resp->xbuf->tail[0].iov_base;
3066 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3067
3068 return 0;
3069 err_no_verf:
3070 p = savep;
3071 ADJUST_ARGS();
3072 return nfserr;
3073 }
3074
3075 static __be32
3076 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3077 {
3078 __be32 *p;
3079
3080 if (!nfserr) {
3081 RESERVE_SPACE(20);
3082 write_cinfo(&p, &remove->rm_cinfo);
3083 ADJUST_ARGS();
3084 }
3085 return nfserr;
3086 }
3087
3088 static __be32
3089 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3090 {
3091 __be32 *p;
3092
3093 if (!nfserr) {
3094 RESERVE_SPACE(40);
3095 write_cinfo(&p, &rename->rn_sinfo);
3096 write_cinfo(&p, &rename->rn_tinfo);
3097 ADJUST_ARGS();
3098 }
3099 return nfserr;
3100 }
3101
3102 static __be32
3103 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3104 __be32 nfserr,struct svc_export *exp)
3105 {
3106 int i = 0;
3107 u32 nflavs;
3108 struct exp_flavor_info *flavs;
3109 struct exp_flavor_info def_flavs[2];
3110 __be32 *p;
3111
3112 if (nfserr)
3113 goto out;
3114 if (exp->ex_nflavors) {
3115 flavs = exp->ex_flavors;
3116 nflavs = exp->ex_nflavors;
3117 } else { /* Handling of some defaults in absence of real secinfo: */
3118 flavs = def_flavs;
3119 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3120 nflavs = 2;
3121 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3122 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3123 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3124 nflavs = 1;
3125 flavs[0].pseudoflavor
3126 = svcauth_gss_flavor(exp->ex_client);
3127 } else {
3128 nflavs = 1;
3129 flavs[0].pseudoflavor
3130 = exp->ex_client->flavour->flavour;
3131 }
3132 }
3133
3134 RESERVE_SPACE(4);
3135 WRITE32(nflavs);
3136 ADJUST_ARGS();
3137 for (i = 0; i < nflavs; i++) {
3138 u32 flav = flavs[i].pseudoflavor;
3139 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3140
3141 if (gm) {
3142 RESERVE_SPACE(4);
3143 WRITE32(RPC_AUTH_GSS);
3144 ADJUST_ARGS();
3145 RESERVE_SPACE(4 + gm->gm_oid.len);
3146 WRITE32(gm->gm_oid.len);
3147 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3148 ADJUST_ARGS();
3149 RESERVE_SPACE(4);
3150 WRITE32(0); /* qop */
3151 ADJUST_ARGS();
3152 RESERVE_SPACE(4);
3153 WRITE32(gss_pseudoflavor_to_service(gm, flav));
3154 ADJUST_ARGS();
3155 gss_mech_put(gm);
3156 } else {
3157 RESERVE_SPACE(4);
3158 WRITE32(flav);
3159 ADJUST_ARGS();
3160 }
3161 }
3162 out:
3163 if (exp)
3164 exp_put(exp);
3165 return nfserr;
3166 }
3167
3168 static __be32
3169 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3170 struct nfsd4_secinfo *secinfo)
3171 {
3172 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3173 }
3174
3175 static __be32
3176 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3177 struct nfsd4_secinfo_no_name *secinfo)
3178 {
3179 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3180 }
3181
3182 /*
3183 * The SETATTR encode routine is special -- it always encodes a bitmap,
3184 * regardless of the error status.
3185 */
3186 static __be32
3187 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3188 {
3189 __be32 *p;
3190
3191 RESERVE_SPACE(12);
3192 if (nfserr) {
3193 WRITE32(2);
3194 WRITE32(0);
3195 WRITE32(0);
3196 }
3197 else {
3198 WRITE32(2);
3199 WRITE32(setattr->sa_bmval[0]);
3200 WRITE32(setattr->sa_bmval[1]);
3201 }
3202 ADJUST_ARGS();
3203 return nfserr;
3204 }
3205
3206 static __be32
3207 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3208 {
3209 __be32 *p;
3210
3211 if (!nfserr) {
3212 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3213 WRITEMEM(&scd->se_clientid, 8);
3214 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3215 ADJUST_ARGS();
3216 }
3217 else if (nfserr == nfserr_clid_inuse) {
3218 RESERVE_SPACE(8);
3219 WRITE32(0);
3220 WRITE32(0);
3221 ADJUST_ARGS();
3222 }
3223 return nfserr;
3224 }
3225
3226 static __be32
3227 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3228 {
3229 __be32 *p;
3230
3231 if (!nfserr) {
3232 RESERVE_SPACE(16);
3233 WRITE32(write->wr_bytes_written);
3234 WRITE32(write->wr_how_written);
3235 WRITEMEM(write->wr_verifier.data, 8);
3236 ADJUST_ARGS();
3237 }
3238 return nfserr;
3239 }
3240
3241 static __be32
3242 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3243 struct nfsd4_exchange_id *exid)
3244 {
3245 __be32 *p;
3246 char *major_id;
3247 char *server_scope;
3248 int major_id_sz;
3249 int server_scope_sz;
3250 uint64_t minor_id = 0;
3251
3252 if (nfserr)
3253 return nfserr;
3254
3255 major_id = utsname()->nodename;
3256 major_id_sz = strlen(major_id);
3257 server_scope = utsname()->nodename;
3258 server_scope_sz = strlen(server_scope);
3259
3260 RESERVE_SPACE(
3261 8 /* eir_clientid */ +
3262 4 /* eir_sequenceid */ +
3263 4 /* eir_flags */ +
3264 4 /* spr_how (SP4_NONE) */ +
3265 8 /* so_minor_id */ +
3266 4 /* so_major_id.len */ +
3267 (XDR_QUADLEN(major_id_sz) * 4) +
3268 4 /* eir_server_scope.len */ +
3269 (XDR_QUADLEN(server_scope_sz) * 4) +
3270 4 /* eir_server_impl_id.count (0) */);
3271
3272 WRITEMEM(&exid->clientid, 8);
3273 WRITE32(exid->seqid);
3274 WRITE32(exid->flags);
3275
3276 /* state_protect4_r. Currently only support SP4_NONE */
3277 BUG_ON(exid->spa_how != SP4_NONE);
3278 WRITE32(exid->spa_how);
3279
3280 /* The server_owner struct */
3281 WRITE64(minor_id); /* Minor id */
3282 /* major id */
3283 WRITE32(major_id_sz);
3284 WRITEMEM(major_id, major_id_sz);
3285
3286 /* Server scope */
3287 WRITE32(server_scope_sz);
3288 WRITEMEM(server_scope, server_scope_sz);
3289
3290 /* Implementation id */
3291 WRITE32(0); /* zero length nfs_impl_id4 array */
3292 ADJUST_ARGS();
3293 return 0;
3294 }
3295
3296 static __be32
3297 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3298 struct nfsd4_create_session *sess)
3299 {
3300 __be32 *p;
3301
3302 if (nfserr)
3303 return nfserr;
3304
3305 RESERVE_SPACE(24);
3306 WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3307 WRITE32(sess->seqid);
3308 WRITE32(sess->flags);
3309 ADJUST_ARGS();
3310
3311 RESERVE_SPACE(28);
3312 WRITE32(0); /* headerpadsz */
3313 WRITE32(sess->fore_channel.maxreq_sz);
3314 WRITE32(sess->fore_channel.maxresp_sz);
3315 WRITE32(sess->fore_channel.maxresp_cached);
3316 WRITE32(sess->fore_channel.maxops);
3317 WRITE32(sess->fore_channel.maxreqs);
3318 WRITE32(sess->fore_channel.nr_rdma_attrs);
3319 ADJUST_ARGS();
3320
3321 if (sess->fore_channel.nr_rdma_attrs) {
3322 RESERVE_SPACE(4);
3323 WRITE32(sess->fore_channel.rdma_attrs);
3324 ADJUST_ARGS();
3325 }
3326
3327 RESERVE_SPACE(28);
3328 WRITE32(0); /* headerpadsz */
3329 WRITE32(sess->back_channel.maxreq_sz);
3330 WRITE32(sess->back_channel.maxresp_sz);
3331 WRITE32(sess->back_channel.maxresp_cached);
3332 WRITE32(sess->back_channel.maxops);
3333 WRITE32(sess->back_channel.maxreqs);
3334 WRITE32(sess->back_channel.nr_rdma_attrs);
3335 ADJUST_ARGS();
3336
3337 if (sess->back_channel.nr_rdma_attrs) {
3338 RESERVE_SPACE(4);
3339 WRITE32(sess->back_channel.rdma_attrs);
3340 ADJUST_ARGS();
3341 }
3342 return 0;
3343 }
3344
3345 static __be32
3346 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3347 struct nfsd4_destroy_session *destroy_session)
3348 {
3349 return nfserr;
3350 }
3351
3352 static __be32
3353 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3354 struct nfsd4_free_stateid *free_stateid)
3355 {
3356 __be32 *p;
3357
3358 if (nfserr)
3359 return nfserr;
3360
3361 RESERVE_SPACE(4);
3362 WRITE32(nfserr);
3363 ADJUST_ARGS();
3364 return nfserr;
3365 }
3366
3367 static __be32
3368 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3369 struct nfsd4_sequence *seq)
3370 {
3371 __be32 *p;
3372
3373 if (nfserr)
3374 return nfserr;
3375
3376 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3377 WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3378 WRITE32(seq->seqid);
3379 WRITE32(seq->slotid);
3380 /* Note slotid's are numbered from zero: */
3381 WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3382 WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3383 WRITE32(seq->status_flags);
3384
3385 ADJUST_ARGS();
3386 resp->cstate.datap = p; /* DRC cache data pointer */
3387 return 0;
3388 }
3389
3390 __be32
3391 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3392 struct nfsd4_test_stateid *test_stateid)
3393 {
3394 struct nfsd4_compoundargs *argp;
3395 struct nfs4_client *cl = resp->cstate.session->se_client;
3396 stateid_t si;
3397 __be32 *p;
3398 int i;
3399 int valid;
3400
3401 restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3402 argp = test_stateid->ts_saved_args;
3403
3404 RESERVE_SPACE(4);
3405 *p++ = htonl(test_stateid->ts_num_ids);
3406 resp->p = p;
3407
3408 nfs4_lock_state();
3409 for (i = 0; i < test_stateid->ts_num_ids; i++) {
3410 nfsd4_decode_stateid(argp, &si);
3411 valid = nfs4_validate_stateid(cl, &si);
3412 RESERVE_SPACE(4);
3413 *p++ = htonl(valid);
3414 resp->p = p;
3415 }
3416 nfs4_unlock_state();
3417
3418 return nfserr;
3419 }
3420
3421 static __be32
3422 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3423 {
3424 return nfserr;
3425 }
3426
3427 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3428
3429 /*
3430 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3431 * since we don't need to filter out obsolete ops as this is
3432 * done in the decoding phase.
3433 */
3434 static nfsd4_enc nfsd4_enc_ops[] = {
3435 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3436 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3437 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3438 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3439 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3440 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3441 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3442 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3443 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3444 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3445 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3446 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3447 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3448 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3449 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3450 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3451 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3452 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3453 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3454 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3455 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3456 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3457 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3458 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3459 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3460 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3461 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3462 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3463 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3464 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3465 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3466 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3467 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3468 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3469 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3470 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3471 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3472
3473 /* NFSv4.1 operations */
3474 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3475 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3476 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3477 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3478 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_destroy_session,
3479 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_free_stateid,
3480 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3481 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3482 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3483 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3484 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3485 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3486 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3487 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3488 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3489 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3490 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3491 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3492 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3493 };
3494
3495 /*
3496 * Calculate the total amount of memory that the compound response has taken
3497 * after encoding the current operation with pad.
3498 *
3499 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3500 * which was specified at nfsd4_operation, else pad is zero.
3501 *
3502 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3503 *
3504 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3505 * will be at least a page and will therefore hold the xdr_buf head.
3506 */
3507 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3508 {
3509 struct xdr_buf *xb = &resp->rqstp->rq_res;
3510 struct nfsd4_session *session = NULL;
3511 struct nfsd4_slot *slot = resp->cstate.slot;
3512 u32 length, tlen = 0;
3513
3514 if (!nfsd4_has_session(&resp->cstate))
3515 return 0;
3516
3517 session = resp->cstate.session;
3518 if (session == NULL)
3519 return 0;
3520
3521 if (xb->page_len == 0) {
3522 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3523 } else {
3524 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3525 tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3526
3527 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3528 }
3529 dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3530 length, xb->page_len, tlen, pad);
3531
3532 if (length > session->se_fchannel.maxresp_sz)
3533 return nfserr_rep_too_big;
3534
3535 if (slot->sl_cachethis == 1 &&
3536 length > session->se_fchannel.maxresp_cached)
3537 return nfserr_rep_too_big_to_cache;
3538
3539 return 0;
3540 }
3541
3542 void
3543 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3544 {
3545 __be32 *statp;
3546 __be32 *p;
3547
3548 RESERVE_SPACE(8);
3549 WRITE32(op->opnum);
3550 statp = p++; /* to be backfilled at the end */
3551 ADJUST_ARGS();
3552
3553 if (op->opnum == OP_ILLEGAL)
3554 goto status;
3555 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3556 !nfsd4_enc_ops[op->opnum]);
3557 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3558 /* nfsd4_check_drc_limit guarantees enough room for error status */
3559 if (!op->status)
3560 op->status = nfsd4_check_resp_size(resp, 0);
3561 status:
3562 /*
3563 * Note: We write the status directly, instead of using WRITE32(),
3564 * since it is already in network byte order.
3565 */
3566 *statp = op->status;
3567 }
3568
3569 /*
3570 * Encode the reply stored in the stateowner reply cache
3571 *
3572 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3573 * previously sent already encoded operation.
3574 *
3575 * called with nfs4_lock_state() held
3576 */
3577 void
3578 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3579 {
3580 __be32 *p;
3581 struct nfs4_replay *rp = op->replay;
3582
3583 BUG_ON(!rp);
3584
3585 RESERVE_SPACE(8);
3586 WRITE32(op->opnum);
3587 *p++ = rp->rp_status; /* already xdr'ed */
3588 ADJUST_ARGS();
3589
3590 RESERVE_SPACE(rp->rp_buflen);
3591 WRITEMEM(rp->rp_buf, rp->rp_buflen);
3592 ADJUST_ARGS();
3593 }
3594
3595 int
3596 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3597 {
3598 return xdr_ressize_check(rqstp, p);
3599 }
3600
3601 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3602 {
3603 struct svc_rqst *rqstp = rq;
3604 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3605
3606 if (args->ops != args->iops) {
3607 kfree(args->ops);
3608 args->ops = args->iops;
3609 }
3610 kfree(args->tmpp);
3611 args->tmpp = NULL;
3612 while (args->to_free) {
3613 struct tmpbuf *tb = args->to_free;
3614 args->to_free = tb->next;
3615 tb->release(tb->buf);
3616 kfree(tb);
3617 }
3618 return 1;
3619 }
3620
3621 int
3622 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3623 {
3624 args->p = p;
3625 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3626 args->pagelist = rqstp->rq_arg.pages;
3627 args->pagelen = rqstp->rq_arg.page_len;
3628 args->tmpp = NULL;
3629 args->to_free = NULL;
3630 args->ops = args->iops;
3631 args->rqstp = rqstp;
3632
3633 return !nfsd4_decode_compound(args);
3634 }
3635
3636 int
3637 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3638 {
3639 /*
3640 * All that remains is to write the tag and operation count...
3641 */
3642 struct nfsd4_compound_state *cs = &resp->cstate;
3643 struct kvec *iov;
3644 p = resp->tagp;
3645 *p++ = htonl(resp->taglen);
3646 memcpy(p, resp->tag, resp->taglen);
3647 p += XDR_QUADLEN(resp->taglen);
3648 *p++ = htonl(resp->opcnt);
3649
3650 if (rqstp->rq_res.page_len)
3651 iov = &rqstp->rq_res.tail[0];
3652 else
3653 iov = &rqstp->rq_res.head[0];
3654 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3655 BUG_ON(iov->iov_len > PAGE_SIZE);
3656 if (nfsd4_has_session(cs)) {
3657 if (cs->status != nfserr_replay_cache) {
3658 nfsd4_store_cache_entry(resp);
3659 dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3660 cs->slot->sl_inuse = false;
3661 }
3662 /* Renew the clientid on success and on replay */
3663 release_session_client(cs->session);
3664 nfsd4_put_session(cs->session);
3665 }
3666 return 1;
3667 }
3668
3669 /*
3670 * Local variables:
3671 * c-basic-offset: 8
3672 * End:
3673 */