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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / fs / nfsd / nfs4xdr.c
blob66d095d7955ec0a3bea156370fee9e2955afd022
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 = kmalloc(nbytes, GFP_KERNEL);
219 if (!p)
220 return NULL;
221 memcpy(p, argp->tmp, nbytes);
222 } else {
223 BUG_ON(p != argp->tmpp);
224 argp->tmpp = NULL;
225 }
226 if (defer_free(argp, kfree, p)) {
227 kfree(p);
228 return NULL;
229 } else
230 return (char *)p;
231 }
232
233 static __be32
234 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
235 {
236 u32 bmlen;
237 DECODE_HEAD;
238
239 bmval[0] = 0;
240 bmval[1] = 0;
241 bmval[2] = 0;
242
243 READ_BUF(4);
244 READ32(bmlen);
245 if (bmlen > 1000)
246 goto xdr_error;
247
248 READ_BUF(bmlen << 2);
249 if (bmlen > 0)
250 READ32(bmval[0]);
251 if (bmlen > 1)
252 READ32(bmval[1]);
253 if (bmlen > 2)
254 READ32(bmval[2]);
255
256 DECODE_TAIL;
257 }
258
259 static __be32
260 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
261 struct iattr *iattr, struct nfs4_acl **acl)
262 {
263 int expected_len, len = 0;
264 u32 dummy32;
265 char *buf;
266 int host_err;
267
268 DECODE_HEAD;
269 iattr->ia_valid = 0;
270 if ((status = nfsd4_decode_bitmap(argp, bmval)))
271 return status;
272
273 READ_BUF(4);
274 READ32(expected_len);
275
276 if (bmval[0] & FATTR4_WORD0_SIZE) {
277 READ_BUF(8);
278 len += 8;
279 READ64(iattr->ia_size);
280 iattr->ia_valid |= ATTR_SIZE;
281 }
282 if (bmval[0] & FATTR4_WORD0_ACL) {
283 int nace;
284 struct nfs4_ace *ace;
285
286 READ_BUF(4); len += 4;
287 READ32(nace);
288
289 if (nace > NFS4_ACL_MAX)
290 return nfserr_resource;
291
292 *acl = nfs4_acl_new(nace);
293 if (*acl == NULL) {
294 host_err = -ENOMEM;
295 goto out_nfserr;
296 }
297 defer_free(argp, kfree, *acl);
298
299 (*acl)->naces = nace;
300 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
301 READ_BUF(16); len += 16;
302 READ32(ace->type);
303 READ32(ace->flag);
304 READ32(ace->access_mask);
305 READ32(dummy32);
306 READ_BUF(dummy32);
307 len += XDR_QUADLEN(dummy32) << 2;
308 READMEM(buf, dummy32);
309 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
310 status = nfs_ok;
311 if (ace->whotype != NFS4_ACL_WHO_NAMED)
312 ace->who = 0;
313 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
314 status = nfsd_map_name_to_gid(argp->rqstp,
315 buf, dummy32, &ace->who);
316 else
317 status = nfsd_map_name_to_uid(argp->rqstp,
318 buf, dummy32, &ace->who);
319 if (status)
320 return status;
321 }
322 } else
323 *acl = NULL;
324 if (bmval[1] & FATTR4_WORD1_MODE) {
325 READ_BUF(4);
326 len += 4;
327 READ32(iattr->ia_mode);
328 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
329 iattr->ia_valid |= ATTR_MODE;
330 }
331 if (bmval[1] & FATTR4_WORD1_OWNER) {
332 READ_BUF(4);
333 len += 4;
334 READ32(dummy32);
335 READ_BUF(dummy32);
336 len += (XDR_QUADLEN(dummy32) << 2);
337 READMEM(buf, dummy32);
338 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
339 return status;
340 iattr->ia_valid |= ATTR_UID;
341 }
342 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
343 READ_BUF(4);
344 len += 4;
345 READ32(dummy32);
346 READ_BUF(dummy32);
347 len += (XDR_QUADLEN(dummy32) << 2);
348 READMEM(buf, dummy32);
349 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
350 return status;
351 iattr->ia_valid |= ATTR_GID;
352 }
353 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
354 READ_BUF(4);
355 len += 4;
356 READ32(dummy32);
357 switch (dummy32) {
358 case NFS4_SET_TO_CLIENT_TIME:
359 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
360 all 32 bits of 'nseconds'. */
361 READ_BUF(12);
362 len += 12;
363 READ32(dummy32);
364 if (dummy32)
365 return nfserr_inval;
366 READ32(iattr->ia_atime.tv_sec);
367 READ32(iattr->ia_atime.tv_nsec);
368 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
369 return nfserr_inval;
370 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
371 break;
372 case NFS4_SET_TO_SERVER_TIME:
373 iattr->ia_valid |= ATTR_ATIME;
374 break;
375 default:
376 goto xdr_error;
377 }
378 }
379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
380 READ_BUF(4);
381 len += 4;
382 READ32(dummy32);
383 switch (dummy32) {
384 case NFS4_SET_TO_CLIENT_TIME:
385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
386 all 32 bits of 'nseconds'. */
387 READ_BUF(12);
388 len += 12;
389 READ32(dummy32);
390 if (dummy32)
391 return nfserr_inval;
392 READ32(iattr->ia_mtime.tv_sec);
393 READ32(iattr->ia_mtime.tv_nsec);
394 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
395 return nfserr_inval;
396 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
397 break;
398 case NFS4_SET_TO_SERVER_TIME:
399 iattr->ia_valid |= ATTR_MTIME;
400 break;
401 default:
402 goto xdr_error;
403 }
404 }
405 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
406 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
407 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
408 READ_BUF(expected_len - len);
409 else if (len != expected_len)
410 goto xdr_error;
411
412 DECODE_TAIL;
413
414 out_nfserr:
415 status = nfserrno(host_err);
416 goto out;
417 }
418
419 static __be32
420 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
421 {
422 DECODE_HEAD;
423
424 READ_BUF(sizeof(stateid_t));
425 READ32(sid->si_generation);
426 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
427
428 DECODE_TAIL;
429 }
430
431 static __be32
432 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
433 {
434 DECODE_HEAD;
435
436 READ_BUF(4);
437 READ32(access->ac_req_access);
438
439 DECODE_TAIL;
440 }
441
442 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
443 {
444 DECODE_HEAD;
445
446 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
447 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
448 READ32(bcts->dir);
449 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
450 * could help us figure out we should be using it. */
451 DECODE_TAIL;
452 }
453
454 static __be32
455 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
456 {
457 DECODE_HEAD;
458
459 READ_BUF(4);
460 READ32(close->cl_seqid);
461 return nfsd4_decode_stateid(argp, &close->cl_stateid);
462
463 DECODE_TAIL;
464 }
465
466
467 static __be32
468 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
469 {
470 DECODE_HEAD;
471
472 READ_BUF(12);
473 READ64(commit->co_offset);
474 READ32(commit->co_count);
475
476 DECODE_TAIL;
477 }
478
479 static __be32
480 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
481 {
482 DECODE_HEAD;
483
484 READ_BUF(4);
485 READ32(create->cr_type);
486 switch (create->cr_type) {
487 case NF4LNK:
488 READ_BUF(4);
489 READ32(create->cr_linklen);
490 READ_BUF(create->cr_linklen);
491 SAVEMEM(create->cr_linkname, create->cr_linklen);
492 break;
493 case NF4BLK:
494 case NF4CHR:
495 READ_BUF(8);
496 READ32(create->cr_specdata1);
497 READ32(create->cr_specdata2);
498 break;
499 case NF4SOCK:
500 case NF4FIFO:
501 case NF4DIR:
502 default:
503 break;
504 }
505
506 READ_BUF(4);
507 READ32(create->cr_namelen);
508 READ_BUF(create->cr_namelen);
509 SAVEMEM(create->cr_name, create->cr_namelen);
510 if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
511 return status;
512
513 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
514 &create->cr_acl);
515 if (status)
516 goto out;
517
518 DECODE_TAIL;
519 }
520
521 static inline __be32
522 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
523 {
524 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
525 }
526
527 static inline __be32
528 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
529 {
530 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
531 }
532
533 static __be32
534 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
535 {
536 DECODE_HEAD;
537
538 READ_BUF(4);
539 READ32(link->li_namelen);
540 READ_BUF(link->li_namelen);
541 SAVEMEM(link->li_name, link->li_namelen);
542 if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
543 return status;
544
545 DECODE_TAIL;
546 }
547
548 static __be32
549 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
550 {
551 DECODE_HEAD;
552
553 /*
554 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
555 */
556 READ_BUF(28);
557 READ32(lock->lk_type);
558 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
559 goto xdr_error;
560 READ32(lock->lk_reclaim);
561 READ64(lock->lk_offset);
562 READ64(lock->lk_length);
563 READ32(lock->lk_is_new);
564
565 if (lock->lk_is_new) {
566 READ_BUF(4);
567 READ32(lock->lk_new_open_seqid);
568 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
569 if (status)
570 return status;
571 READ_BUF(8 + sizeof(clientid_t));
572 READ32(lock->lk_new_lock_seqid);
573 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
574 READ32(lock->lk_new_owner.len);
575 READ_BUF(lock->lk_new_owner.len);
576 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
577 } else {
578 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
579 if (status)
580 return status;
581 READ_BUF(4);
582 READ32(lock->lk_old_lock_seqid);
583 }
584
585 DECODE_TAIL;
586 }
587
588 static __be32
589 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
590 {
591 DECODE_HEAD;
592
593 READ_BUF(32);
594 READ32(lockt->lt_type);
595 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
596 goto xdr_error;
597 READ64(lockt->lt_offset);
598 READ64(lockt->lt_length);
599 COPYMEM(&lockt->lt_clientid, 8);
600 READ32(lockt->lt_owner.len);
601 READ_BUF(lockt->lt_owner.len);
602 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
603
604 DECODE_TAIL;
605 }
606
607 static __be32
608 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
609 {
610 DECODE_HEAD;
611
612 READ_BUF(8);
613 READ32(locku->lu_type);
614 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
615 goto xdr_error;
616 READ32(locku->lu_seqid);
617 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
618 if (status)
619 return status;
620 READ_BUF(16);
621 READ64(locku->lu_offset);
622 READ64(locku->lu_length);
623
624 DECODE_TAIL;
625 }
626
627 static __be32
628 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
629 {
630 DECODE_HEAD;
631
632 READ_BUF(4);
633 READ32(lookup->lo_len);
634 READ_BUF(lookup->lo_len);
635 SAVEMEM(lookup->lo_name, lookup->lo_len);
636 if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
637 return status;
638
639 DECODE_TAIL;
640 }
641
642 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
643 {
644 __be32 *p;
645 u32 w;
646
647 READ_BUF(4);
648 READ32(w);
649 *x = w;
650 switch (w & NFS4_SHARE_ACCESS_MASK) {
651 case NFS4_SHARE_ACCESS_READ:
652 case NFS4_SHARE_ACCESS_WRITE:
653 case NFS4_SHARE_ACCESS_BOTH:
654 break;
655 default:
656 return nfserr_bad_xdr;
657 }
658 w &= !NFS4_SHARE_ACCESS_MASK;
659 if (!w)
660 return nfs_ok;
661 if (!argp->minorversion)
662 return nfserr_bad_xdr;
663 switch (w & NFS4_SHARE_WANT_MASK) {
664 case NFS4_SHARE_WANT_NO_PREFERENCE:
665 case NFS4_SHARE_WANT_READ_DELEG:
666 case NFS4_SHARE_WANT_WRITE_DELEG:
667 case NFS4_SHARE_WANT_ANY_DELEG:
668 case NFS4_SHARE_WANT_NO_DELEG:
669 case NFS4_SHARE_WANT_CANCEL:
670 break;
671 default:
672 return nfserr_bad_xdr;
673 }
674 w &= ~NFS4_SHARE_WANT_MASK;
675 if (!w)
676 return nfs_ok;
677 switch (w) {
678 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
679 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
680 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
681 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
682 return nfs_ok;
683 }
684 xdr_error:
685 return nfserr_bad_xdr;
686 }
687
688 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
689 {
690 __be32 *p;
691
692 READ_BUF(4);
693 READ32(*x);
694 /* Note: unlinke access bits, deny bits may be zero. */
695 if (*x & ~NFS4_SHARE_DENY_BOTH)
696 return nfserr_bad_xdr;
697 return nfs_ok;
698 xdr_error:
699 return nfserr_bad_xdr;
700 }
701
702 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
703 {
704 __be32 *p;
705
706 READ_BUF(4);
707 READ32(o->len);
708
709 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
710 return nfserr_bad_xdr;
711
712 READ_BUF(o->len);
713 SAVEMEM(o->data, o->len);
714 return nfs_ok;
715 xdr_error:
716 return nfserr_bad_xdr;
717 }
718
719 static __be32
720 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
721 {
722 DECODE_HEAD;
723
724 memset(open->op_bmval, 0, sizeof(open->op_bmval));
725 open->op_iattr.ia_valid = 0;
726 open->op_openowner = NULL;
727
728 /* seqid, share_access, share_deny, clientid, ownerlen */
729 READ_BUF(4);
730 READ32(open->op_seqid);
731 status = nfsd4_decode_share_access(argp, &open->op_share_access);
732 if (status)
733 goto xdr_error;
734 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
735 if (status)
736 goto xdr_error;
737 READ_BUF(sizeof(clientid_t));
738 COPYMEM(&open->op_clientid, sizeof(clientid_t));
739 status = nfsd4_decode_opaque(argp, &open->op_owner);
740 if (status)
741 goto xdr_error;
742 READ_BUF(4);
743 READ32(open->op_create);
744 switch (open->op_create) {
745 case NFS4_OPEN_NOCREATE:
746 break;
747 case NFS4_OPEN_CREATE:
748 READ_BUF(4);
749 READ32(open->op_createmode);
750 switch (open->op_createmode) {
751 case NFS4_CREATE_UNCHECKED:
752 case NFS4_CREATE_GUARDED:
753 status = nfsd4_decode_fattr(argp, open->op_bmval,
754 &open->op_iattr, &open->op_acl);
755 if (status)
756 goto out;
757 break;
758 case NFS4_CREATE_EXCLUSIVE:
759 READ_BUF(8);
760 COPYMEM(open->op_verf.data, 8);
761 break;
762 case NFS4_CREATE_EXCLUSIVE4_1:
763 if (argp->minorversion < 1)
764 goto xdr_error;
765 READ_BUF(8);
766 COPYMEM(open->op_verf.data, 8);
767 status = nfsd4_decode_fattr(argp, open->op_bmval,
768 &open->op_iattr, &open->op_acl);
769 if (status)
770 goto out;
771 break;
772 default:
773 goto xdr_error;
774 }
775 break;
776 default:
777 goto xdr_error;
778 }
779
780 /* open_claim */
781 READ_BUF(4);
782 READ32(open->op_claim_type);
783 switch (open->op_claim_type) {
784 case NFS4_OPEN_CLAIM_NULL:
785 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
786 READ_BUF(4);
787 READ32(open->op_fname.len);
788 READ_BUF(open->op_fname.len);
789 SAVEMEM(open->op_fname.data, open->op_fname.len);
790 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
791 return status;
792 break;
793 case NFS4_OPEN_CLAIM_PREVIOUS:
794 READ_BUF(4);
795 READ32(open->op_delegate_type);
796 break;
797 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
798 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
799 if (status)
800 return status;
801 READ_BUF(4);
802 READ32(open->op_fname.len);
803 READ_BUF(open->op_fname.len);
804 SAVEMEM(open->op_fname.data, open->op_fname.len);
805 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
806 return status;
807 break;
808 case NFS4_OPEN_CLAIM_FH:
809 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
810 if (argp->minorversion < 1)
811 goto xdr_error;
812 /* void */
813 break;
814 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
815 if (argp->minorversion < 1)
816 goto xdr_error;
817 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
818 if (status)
819 return status;
820 break;
821 default:
822 goto xdr_error;
823 }
824
825 DECODE_TAIL;
826 }
827
828 static __be32
829 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
830 {
831 DECODE_HEAD;
832
833 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
834 if (status)
835 return status;
836 READ_BUF(4);
837 READ32(open_conf->oc_seqid);
838
839 DECODE_TAIL;
840 }
841
842 static __be32
843 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
844 {
845 DECODE_HEAD;
846
847 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
848 if (status)
849 return status;
850 READ_BUF(4);
851 READ32(open_down->od_seqid);
852 status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
853 if (status)
854 return status;
855 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
856 if (status)
857 return status;
858 DECODE_TAIL;
859 }
860
861 static __be32
862 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
863 {
864 DECODE_HEAD;
865
866 READ_BUF(4);
867 READ32(putfh->pf_fhlen);
868 if (putfh->pf_fhlen > NFS4_FHSIZE)
869 goto xdr_error;
870 READ_BUF(putfh->pf_fhlen);
871 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
872
873 DECODE_TAIL;
874 }
875
876 static __be32
877 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
878 {
879 DECODE_HEAD;
880
881 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
882 if (status)
883 return status;
884 READ_BUF(12);
885 READ64(read->rd_offset);
886 READ32(read->rd_length);
887
888 DECODE_TAIL;
889 }
890
891 static __be32
892 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
893 {
894 DECODE_HEAD;
895
896 READ_BUF(24);
897 READ64(readdir->rd_cookie);
898 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
899 READ32(readdir->rd_dircount); /* just in case you needed a useless field... */
900 READ32(readdir->rd_maxcount);
901 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
902 goto out;
903
904 DECODE_TAIL;
905 }
906
907 static __be32
908 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
909 {
910 DECODE_HEAD;
911
912 READ_BUF(4);
913 READ32(remove->rm_namelen);
914 READ_BUF(remove->rm_namelen);
915 SAVEMEM(remove->rm_name, remove->rm_namelen);
916 if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
917 return status;
918
919 DECODE_TAIL;
920 }
921
922 static __be32
923 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
924 {
925 DECODE_HEAD;
926
927 READ_BUF(4);
928 READ32(rename->rn_snamelen);
929 READ_BUF(rename->rn_snamelen + 4);
930 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
931 READ32(rename->rn_tnamelen);
932 READ_BUF(rename->rn_tnamelen);
933 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
934 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
935 return status;
936 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
937 return status;
938
939 DECODE_TAIL;
940 }
941
942 static __be32
943 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
944 {
945 DECODE_HEAD;
946
947 READ_BUF(sizeof(clientid_t));
948 COPYMEM(clientid, sizeof(clientid_t));
949
950 DECODE_TAIL;
951 }
952
953 static __be32
954 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
955 struct nfsd4_secinfo *secinfo)
956 {
957 DECODE_HEAD;
958
959 READ_BUF(4);
960 READ32(secinfo->si_namelen);
961 READ_BUF(secinfo->si_namelen);
962 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
963 status = check_filename(secinfo->si_name, secinfo->si_namelen,
964 nfserr_noent);
965 if (status)
966 return status;
967 DECODE_TAIL;
968 }
969
970 static __be32
971 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
972 struct nfsd4_secinfo_no_name *sin)
973 {
974 DECODE_HEAD;
975
976 READ_BUF(4);
977 READ32(sin->sin_style);
978 DECODE_TAIL;
979 }
980
981 static __be32
982 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
983 {
984 __be32 status;
985
986 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
987 if (status)
988 return status;
989 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
990 &setattr->sa_acl);
991 }
992
993 static __be32
994 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
995 {
996 DECODE_HEAD;
997
998 READ_BUF(8);
999 COPYMEM(setclientid->se_verf.data, 8);
1000
1001 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1002 if (status)
1003 return nfserr_bad_xdr;
1004 READ_BUF(8);
1005 READ32(setclientid->se_callback_prog);
1006 READ32(setclientid->se_callback_netid_len);
1007
1008 READ_BUF(setclientid->se_callback_netid_len + 4);
1009 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1010 READ32(setclientid->se_callback_addr_len);
1011
1012 READ_BUF(setclientid->se_callback_addr_len + 4);
1013 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1014 READ32(setclientid->se_callback_ident);
1015
1016 DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1021 {
1022 DECODE_HEAD;
1023
1024 READ_BUF(8 + sizeof(nfs4_verifier));
1025 COPYMEM(&scd_c->sc_clientid, 8);
1026 COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1027
1028 DECODE_TAIL;
1029 }
1030
1031 /* Also used for NVERIFY */
1032 static __be32
1033 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1034 {
1035 #if 0
1036 struct nfsd4_compoundargs save = {
1037 .p = argp->p,
1038 .end = argp->end,
1039 .rqstp = argp->rqstp,
1040 };
1041 u32 ve_bmval[2];
1042 struct iattr ve_iattr; /* request */
1043 struct nfs4_acl *ve_acl; /* request */
1044 #endif
1045 DECODE_HEAD;
1046
1047 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1048 goto out;
1049
1050 /* For convenience's sake, we compare raw xdr'd attributes in
1051 * nfsd4_proc_verify; however we still decode here just to return
1052 * correct error in case of bad xdr. */
1053 #if 0
1054 status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1055 if (status == nfserr_inval) {
1056 status = nfserrno(status);
1057 goto out;
1058 }
1059 #endif
1060 READ_BUF(4);
1061 READ32(verify->ve_attrlen);
1062 READ_BUF(verify->ve_attrlen);
1063 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1064
1065 DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1070 {
1071 int avail;
1072 int v;
1073 int len;
1074 DECODE_HEAD;
1075
1076 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1077 if (status)
1078 return status;
1079 READ_BUF(16);
1080 READ64(write->wr_offset);
1081 READ32(write->wr_stable_how);
1082 if (write->wr_stable_how > 2)
1083 goto xdr_error;
1084 READ32(write->wr_buflen);
1085
1086 /* Sorry .. no magic macros for this.. *
1087 * READ_BUF(write->wr_buflen);
1088 * SAVEMEM(write->wr_buf, write->wr_buflen);
1089 */
1090 avail = (char*)argp->end - (char*)argp->p;
1091 if (avail + argp->pagelen < write->wr_buflen) {
1092 dprintk("NFSD: xdr error (%s:%d)\n",
1093 __FILE__, __LINE__);
1094 goto xdr_error;
1095 }
1096 argp->rqstp->rq_vec[0].iov_base = p;
1097 argp->rqstp->rq_vec[0].iov_len = avail;
1098 v = 0;
1099 len = write->wr_buflen;
1100 while (len > argp->rqstp->rq_vec[v].iov_len) {
1101 len -= argp->rqstp->rq_vec[v].iov_len;
1102 v++;
1103 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1104 argp->pagelist++;
1105 if (argp->pagelen >= PAGE_SIZE) {
1106 argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1107 argp->pagelen -= PAGE_SIZE;
1108 } else {
1109 argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1110 argp->pagelen -= len;
1111 }
1112 }
1113 argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1114 argp->p = (__be32*) (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1115 argp->rqstp->rq_vec[v].iov_len = len;
1116 write->wr_vlen = v+1;
1117
1118 DECODE_TAIL;
1119 }
1120
1121 static __be32
1122 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1123 {
1124 DECODE_HEAD;
1125
1126 READ_BUF(12);
1127 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1128 READ32(rlockowner->rl_owner.len);
1129 READ_BUF(rlockowner->rl_owner.len);
1130 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1131
1132 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1133 return nfserr_inval;
1134 DECODE_TAIL;
1135 }
1136
1137 static __be32
1138 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1139 struct nfsd4_exchange_id *exid)
1140 {
1141 int dummy, tmp;
1142 DECODE_HEAD;
1143
1144 READ_BUF(NFS4_VERIFIER_SIZE);
1145 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1146
1147 status = nfsd4_decode_opaque(argp, &exid->clname);
1148 if (status)
1149 return nfserr_bad_xdr;
1150
1151 READ_BUF(4);
1152 READ32(exid->flags);
1153
1154 /* Ignore state_protect4_a */
1155 READ_BUF(4);
1156 READ32(exid->spa_how);
1157 switch (exid->spa_how) {
1158 case SP4_NONE:
1159 break;
1160 case SP4_MACH_CRED:
1161 /* spo_must_enforce */
1162 READ_BUF(4);
1163 READ32(dummy);
1164 READ_BUF(dummy * 4);
1165 p += dummy;
1166
1167 /* spo_must_allow */
1168 READ_BUF(4);
1169 READ32(dummy);
1170 READ_BUF(dummy * 4);
1171 p += dummy;
1172 break;
1173 case SP4_SSV:
1174 /* ssp_ops */
1175 READ_BUF(4);
1176 READ32(dummy);
1177 READ_BUF(dummy * 4);
1178 p += dummy;
1179
1180 READ_BUF(4);
1181 READ32(dummy);
1182 READ_BUF(dummy * 4);
1183 p += dummy;
1184
1185 /* ssp_hash_algs<> */
1186 READ_BUF(4);
1187 READ32(tmp);
1188 while (tmp--) {
1189 READ_BUF(4);
1190 READ32(dummy);
1191 READ_BUF(dummy);
1192 p += XDR_QUADLEN(dummy);
1193 }
1194
1195 /* ssp_encr_algs<> */
1196 READ_BUF(4);
1197 READ32(tmp);
1198 while (tmp--) {
1199 READ_BUF(4);
1200 READ32(dummy);
1201 READ_BUF(dummy);
1202 p += XDR_QUADLEN(dummy);
1203 }
1204
1205 /* ssp_window and ssp_num_gss_handles */
1206 READ_BUF(8);
1207 READ32(dummy);
1208 READ32(dummy);
1209 break;
1210 default:
1211 goto xdr_error;
1212 }
1213
1214 /* Ignore Implementation ID */
1215 READ_BUF(4); /* nfs_impl_id4 array length */
1216 READ32(dummy);
1217
1218 if (dummy > 1)
1219 goto xdr_error;
1220
1221 if (dummy == 1) {
1222 /* nii_domain */
1223 READ_BUF(4);
1224 READ32(dummy);
1225 READ_BUF(dummy);
1226 p += XDR_QUADLEN(dummy);
1227
1228 /* nii_name */
1229 READ_BUF(4);
1230 READ32(dummy);
1231 READ_BUF(dummy);
1232 p += XDR_QUADLEN(dummy);
1233
1234 /* nii_date */
1235 READ_BUF(12);
1236 p += 3;
1237 }
1238 DECODE_TAIL;
1239 }
1240
1241 static __be32
1242 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1243 struct nfsd4_create_session *sess)
1244 {
1245 DECODE_HEAD;
1246
1247 u32 dummy;
1248 char *machine_name;
1249 int i;
1250 int nr_secflavs;
1251
1252 READ_BUF(16);
1253 COPYMEM(&sess->clientid, 8);
1254 READ32(sess->seqid);
1255 READ32(sess->flags);
1256
1257 /* Fore channel attrs */
1258 READ_BUF(28);
1259 READ32(dummy); /* headerpadsz is always 0 */
1260 READ32(sess->fore_channel.maxreq_sz);
1261 READ32(sess->fore_channel.maxresp_sz);
1262 READ32(sess->fore_channel.maxresp_cached);
1263 READ32(sess->fore_channel.maxops);
1264 READ32(sess->fore_channel.maxreqs);
1265 READ32(sess->fore_channel.nr_rdma_attrs);
1266 if (sess->fore_channel.nr_rdma_attrs == 1) {
1267 READ_BUF(4);
1268 READ32(sess->fore_channel.rdma_attrs);
1269 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1270 dprintk("Too many fore channel attr bitmaps!\n");
1271 goto xdr_error;
1272 }
1273
1274 /* Back channel attrs */
1275 READ_BUF(28);
1276 READ32(dummy); /* headerpadsz is always 0 */
1277 READ32(sess->back_channel.maxreq_sz);
1278 READ32(sess->back_channel.maxresp_sz);
1279 READ32(sess->back_channel.maxresp_cached);
1280 READ32(sess->back_channel.maxops);
1281 READ32(sess->back_channel.maxreqs);
1282 READ32(sess->back_channel.nr_rdma_attrs);
1283 if (sess->back_channel.nr_rdma_attrs == 1) {
1284 READ_BUF(4);
1285 READ32(sess->back_channel.rdma_attrs);
1286 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1287 dprintk("Too many back channel attr bitmaps!\n");
1288 goto xdr_error;
1289 }
1290
1291 READ_BUF(8);
1292 READ32(sess->callback_prog);
1293
1294 /* callback_sec_params4 */
1295 READ32(nr_secflavs);
1296 for (i = 0; i < nr_secflavs; ++i) {
1297 READ_BUF(4);
1298 READ32(dummy);
1299 switch (dummy) {
1300 case RPC_AUTH_NULL:
1301 /* Nothing to read */
1302 break;
1303 case RPC_AUTH_UNIX:
1304 READ_BUF(8);
1305 /* stamp */
1306 READ32(dummy);
1307
1308 /* machine name */
1309 READ32(dummy);
1310 READ_BUF(dummy);
1311 SAVEMEM(machine_name, dummy);
1312
1313 /* uid, gid */
1314 READ_BUF(8);
1315 READ32(sess->uid);
1316 READ32(sess->gid);
1317
1318 /* more gids */
1319 READ_BUF(4);
1320 READ32(dummy);
1321 READ_BUF(dummy * 4);
1322 break;
1323 case RPC_AUTH_GSS:
1324 dprintk("RPC_AUTH_GSS callback secflavor "
1325 "not supported!\n");
1326 READ_BUF(8);
1327 /* gcbp_service */
1328 READ32(dummy);
1329 /* gcbp_handle_from_server */
1330 READ32(dummy);
1331 READ_BUF(dummy);
1332 p += XDR_QUADLEN(dummy);
1333 /* gcbp_handle_from_client */
1334 READ_BUF(4);
1335 READ32(dummy);
1336 READ_BUF(dummy);
1337 break;
1338 default:
1339 dprintk("Illegal callback secflavor\n");
1340 return nfserr_inval;
1341 }
1342 }
1343 DECODE_TAIL;
1344 }
1345
1346 static __be32
1347 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1348 struct nfsd4_destroy_session *destroy_session)
1349 {
1350 DECODE_HEAD;
1351 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1352 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1353
1354 DECODE_TAIL;
1355 }
1356
1357 static __be32
1358 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1359 struct nfsd4_free_stateid *free_stateid)
1360 {
1361 DECODE_HEAD;
1362
1363 READ_BUF(sizeof(stateid_t));
1364 READ32(free_stateid->fr_stateid.si_generation);
1365 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1366
1367 DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1372 struct nfsd4_sequence *seq)
1373 {
1374 DECODE_HEAD;
1375
1376 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1377 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1378 READ32(seq->seqid);
1379 READ32(seq->slotid);
1380 READ32(seq->maxslots);
1381 READ32(seq->cachethis);
1382
1383 DECODE_TAIL;
1384 }
1385
1386 static __be32
1387 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1388 {
1389 unsigned int nbytes;
1390 stateid_t si;
1391 int i;
1392 __be32 *p;
1393 __be32 status;
1394
1395 READ_BUF(4);
1396 test_stateid->ts_num_ids = ntohl(*p++);
1397
1398 nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1399 if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1400 goto xdr_error;
1401
1402 test_stateid->ts_saved_args = argp;
1403 save_buf(argp, &test_stateid->ts_savedp);
1404
1405 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1406 status = nfsd4_decode_stateid(argp, &si);
1407 if (status)
1408 return status;
1409 }
1410
1411 status = 0;
1412 out:
1413 return status;
1414 xdr_error:
1415 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1416 status = nfserr_bad_xdr;
1417 goto out;
1418 }
1419
1420 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1421 {
1422 DECODE_HEAD;
1423
1424 READ_BUF(8);
1425 COPYMEM(&dc->clientid, 8);
1426
1427 DECODE_TAIL;
1428 }
1429
1430 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1431 {
1432 DECODE_HEAD;
1433
1434 READ_BUF(4);
1435 READ32(rc->rca_one_fs);
1436
1437 DECODE_TAIL;
1438 }
1439
1440 static __be32
1441 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1442 {
1443 return nfs_ok;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1448 {
1449 return nfserr_notsupp;
1450 }
1451
1452 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1453
1454 static nfsd4_dec nfsd4_dec_ops[] = {
1455 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1456 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1457 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1458 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1459 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1460 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1461 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1462 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1463 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1464 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1465 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1466 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1467 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1468 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1469 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1470 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1471 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1472 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1473 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1474 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1475 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_noop,
1476 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1477 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1478 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1479 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1480 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1481 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1482 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1483 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1484 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1485 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1486 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1487 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1488 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1489 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1490 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1491 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1492 };
1493
1494 static nfsd4_dec nfsd41_dec_ops[] = {
1495 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1496 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1497 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1498 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1499 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1500 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1501 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1502 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1503 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1504 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1505 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1506 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1507 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1508 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1509 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1510 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1511 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1512 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_notsupp,
1513 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1514 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1515 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_notsupp,
1516 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1517 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1518 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1519 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1520 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1521 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1522 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_notsupp,
1523 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1524 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1525 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1526 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1527 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_notsupp,
1528 [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1529 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1530 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1531 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_notsupp,
1532
1533 /* new operations for NFSv4.1 */
1534 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_notsupp,
1535 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1536 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1537 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1538 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1539 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1540 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1541 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1542 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1543 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1544 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1545 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1546 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1547 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1548 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1549 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1550 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1551 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1552 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1553 };
1554
1555 struct nfsd4_minorversion_ops {
1556 nfsd4_dec *decoders;
1557 int nops;
1558 };
1559
1560 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1561 [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1562 [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1563 };
1564
1565 static __be32
1566 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1567 {
1568 DECODE_HEAD;
1569 struct nfsd4_op *op;
1570 struct nfsd4_minorversion_ops *ops;
1571 bool cachethis = false;
1572 int i;
1573
1574 /*
1575 * XXX: According to spec, we should check the tag
1576 * for UTF-8 compliance. I'm postponing this for
1577 * now because it seems that some clients do use
1578 * binary tags.
1579 */
1580 READ_BUF(4);
1581 READ32(argp->taglen);
1582 READ_BUF(argp->taglen + 8);
1583 SAVEMEM(argp->tag, argp->taglen);
1584 READ32(argp->minorversion);
1585 READ32(argp->opcnt);
1586
1587 if (argp->taglen > NFSD4_MAX_TAGLEN)
1588 goto xdr_error;
1589 if (argp->opcnt > 100)
1590 goto xdr_error;
1591
1592 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1593 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1594 if (!argp->ops) {
1595 argp->ops = argp->iops;
1596 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1597 goto xdr_error;
1598 }
1599 }
1600
1601 if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1602 argp->opcnt = 0;
1603
1604 ops = &nfsd4_minorversion[argp->minorversion];
1605 for (i = 0; i < argp->opcnt; i++) {
1606 op = &argp->ops[i];
1607 op->replay = NULL;
1608
1609 /*
1610 * We can't use READ_BUF() here because we need to handle
1611 * a missing opcode as an OP_WRITE + 1. So we need to check
1612 * to see if we're truly at the end of our buffer or if there
1613 * is another page we need to flip to.
1614 */
1615
1616 if (argp->p == argp->end) {
1617 if (argp->pagelen < 4) {
1618 /* There isn't an opcode still on the wire */
1619 op->opnum = OP_WRITE + 1;
1620 op->status = nfserr_bad_xdr;
1621 argp->opcnt = i+1;
1622 break;
1623 }
1624
1625 /*
1626 * False alarm. We just hit a page boundary, but there
1627 * is still data available. Move pointer across page
1628 * boundary. *snip from READ_BUF*
1629 */
1630 argp->p = page_address(argp->pagelist[0]);
1631 argp->pagelist++;
1632 if (argp->pagelen < PAGE_SIZE) {
1633 argp->end = argp->p + (argp->pagelen>>2);
1634 argp->pagelen = 0;
1635 } else {
1636 argp->end = argp->p + (PAGE_SIZE>>2);
1637 argp->pagelen -= PAGE_SIZE;
1638 }
1639 }
1640 op->opnum = ntohl(*argp->p++);
1641
1642 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1643 op->status = ops->decoders[op->opnum](argp, &op->u);
1644 else {
1645 op->opnum = OP_ILLEGAL;
1646 op->status = nfserr_op_illegal;
1647 }
1648
1649 if (op->status) {
1650 argp->opcnt = i+1;
1651 break;
1652 }
1653 /*
1654 * We'll try to cache the result in the DRC if any one
1655 * op in the compound wants to be cached:
1656 */
1657 cachethis |= nfsd4_cache_this_op(op);
1658 }
1659 /* Sessions make the DRC unnecessary: */
1660 if (argp->minorversion)
1661 cachethis = false;
1662 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1663
1664 DECODE_TAIL;
1665 }
1666
1667 #define WRITE32(n) *p++ = htonl(n)
1668 #define WRITE64(n) do { \
1669 *p++ = htonl((u32)((n) >> 32)); \
1670 *p++ = htonl((u32)(n)); \
1671 } while (0)
1672 #define WRITEMEM(ptr,nbytes) do { if (nbytes > 0) { \
1673 *(p + XDR_QUADLEN(nbytes) -1) = 0; \
1674 memcpy(p, ptr, nbytes); \
1675 p += XDR_QUADLEN(nbytes); \
1676 }} while (0)
1677
1678 static void write32(__be32 **p, u32 n)
1679 {
1680 *(*p)++ = n;
1681 }
1682
1683 static void write64(__be32 **p, u64 n)
1684 {
1685 write32(p, (u32)(n >> 32));
1686 write32(p, (u32)n);
1687 }
1688
1689 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1690 {
1691 if (IS_I_VERSION(inode)) {
1692 write64(p, inode->i_version);
1693 } else {
1694 write32(p, stat->ctime.tv_sec);
1695 write32(p, stat->ctime.tv_nsec);
1696 }
1697 }
1698
1699 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1700 {
1701 write32(p, c->atomic);
1702 if (c->change_supported) {
1703 write64(p, c->before_change);
1704 write64(p, c->after_change);
1705 } else {
1706 write32(p, c->before_ctime_sec);
1707 write32(p, c->before_ctime_nsec);
1708 write32(p, c->after_ctime_sec);
1709 write32(p, c->after_ctime_nsec);
1710 }
1711 }
1712
1713 #define RESERVE_SPACE(nbytes) do { \
1714 p = resp->p; \
1715 BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end); \
1716 } while (0)
1717 #define ADJUST_ARGS() resp->p = p
1718
1719 /*
1720 * Header routine to setup seqid operation replay cache
1721 */
1722 #define ENCODE_SEQID_OP_HEAD \
1723 __be32 *save; \
1724 \
1725 save = resp->p;
1726
1727 /*
1728 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation. This
1729 * is where sequence id's are incremented, and the replay cache is filled.
1730 * Note that we increment sequence id's here, at the last moment, so we're sure
1731 * we know whether the error to be returned is a sequence id mutating error.
1732 */
1733
1734 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1735 {
1736 struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1737
1738 if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1739 stateowner->so_seqid++;
1740 stateowner->so_replay.rp_status = nfserr;
1741 stateowner->so_replay.rp_buflen =
1742 (char *)resp->p - (char *)save;
1743 memcpy(stateowner->so_replay.rp_buf, save,
1744 stateowner->so_replay.rp_buflen);
1745 nfsd4_purge_closed_stateid(stateowner);
1746 }
1747 }
1748
1749 /* Encode as an array of strings the string given with components
1750 * separated @sep.
1751 */
1752 static __be32 nfsd4_encode_components(char sep, char *components,
1753 __be32 **pp, int *buflen)
1754 {
1755 __be32 *p = *pp;
1756 __be32 *countp = p;
1757 int strlen, count=0;
1758 char *str, *end;
1759
1760 dprintk("nfsd4_encode_components(%s)\n", components);
1761 if ((*buflen -= 4) < 0)
1762 return nfserr_resource;
1763 WRITE32(0); /* We will fill this in with @count later */
1764 end = str = components;
1765 while (*end) {
1766 for (; *end && (*end != sep); end++)
1767 ; /* Point to end of component */
1768 strlen = end - str;
1769 if (strlen) {
1770 if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1771 return nfserr_resource;
1772 WRITE32(strlen);
1773 WRITEMEM(str, strlen);
1774 count++;
1775 }
1776 else
1777 end++;
1778 str = end;
1779 }
1780 *pp = p;
1781 p = countp;
1782 WRITE32(count);
1783 return 0;
1784 }
1785
1786 /*
1787 * encode a location element of a fs_locations structure
1788 */
1789 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1790 __be32 **pp, int *buflen)
1791 {
1792 __be32 status;
1793 __be32 *p = *pp;
1794
1795 status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1796 if (status)
1797 return status;
1798 status = nfsd4_encode_components('/', location->path, &p, buflen);
1799 if (status)
1800 return status;
1801 *pp = p;
1802 return 0;
1803 }
1804
1805 /*
1806 * Encode a path in RFC3530 'pathname4' format
1807 */
1808 static __be32 nfsd4_encode_path(const struct path *root,
1809 const struct path *path, __be32 **pp, int *buflen)
1810 {
1811 struct path cur = {
1812 .mnt = path->mnt,
1813 .dentry = path->dentry,
1814 };
1815 __be32 *p = *pp;
1816 struct dentry **components = NULL;
1817 unsigned int ncomponents = 0;
1818 __be32 err = nfserr_jukebox;
1819
1820 dprintk("nfsd4_encode_components(");
1821
1822 path_get(&cur);
1823 /* First walk the path up to the nfsd root, and store the
1824 * dentries/path components in an array.
1825 */
1826 for (;;) {
1827 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1828 break;
1829 if (cur.dentry == cur.mnt->mnt_root) {
1830 if (follow_up(&cur))
1831 continue;
1832 goto out_free;
1833 }
1834 if ((ncomponents & 15) == 0) {
1835 struct dentry **new;
1836 new = krealloc(components,
1837 sizeof(*new) * (ncomponents + 16),
1838 GFP_KERNEL);
1839 if (!new)
1840 goto out_free;
1841 components = new;
1842 }
1843 components[ncomponents++] = cur.dentry;
1844 cur.dentry = dget_parent(cur.dentry);
1845 }
1846
1847 *buflen -= 4;
1848 if (*buflen < 0)
1849 goto out_free;
1850 WRITE32(ncomponents);
1851
1852 while (ncomponents) {
1853 struct dentry *dentry = components[ncomponents - 1];
1854 unsigned int len = dentry->d_name.len;
1855
1856 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1857 if (*buflen < 0)
1858 goto out_free;
1859 WRITE32(len);
1860 WRITEMEM(dentry->d_name.name, len);
1861 dprintk("/%s", dentry->d_name.name);
1862 dput(dentry);
1863 ncomponents--;
1864 }
1865
1866 *pp = p;
1867 err = 0;
1868 out_free:
1869 dprintk(")\n");
1870 while (ncomponents)
1871 dput(components[--ncomponents]);
1872 kfree(components);
1873 path_put(&cur);
1874 return err;
1875 }
1876
1877 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1878 const struct path *path, __be32 **pp, int *buflen)
1879 {
1880 struct svc_export *exp_ps;
1881 __be32 res;
1882
1883 exp_ps = rqst_find_fsidzero_export(rqstp);
1884 if (IS_ERR(exp_ps))
1885 return nfserrno(PTR_ERR(exp_ps));
1886 res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1887 exp_put(exp_ps);
1888 return res;
1889 }
1890
1891 /*
1892 * encode a fs_locations structure
1893 */
1894 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1895 struct svc_export *exp,
1896 __be32 **pp, int *buflen)
1897 {
1898 __be32 status;
1899 int i;
1900 __be32 *p = *pp;
1901 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1902
1903 status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1904 if (status)
1905 return status;
1906 if ((*buflen -= 4) < 0)
1907 return nfserr_resource;
1908 WRITE32(fslocs->locations_count);
1909 for (i=0; i<fslocs->locations_count; i++) {
1910 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1911 &p, buflen);
1912 if (status)
1913 return status;
1914 }
1915 *pp = p;
1916 return 0;
1917 }
1918
1919 static u32 nfs4_file_type(umode_t mode)
1920 {
1921 switch (mode & S_IFMT) {
1922 case S_IFIFO: return NF4FIFO;
1923 case S_IFCHR: return NF4CHR;
1924 case S_IFDIR: return NF4DIR;
1925 case S_IFBLK: return NF4BLK;
1926 case S_IFLNK: return NF4LNK;
1927 case S_IFREG: return NF4REG;
1928 case S_IFSOCK: return NF4SOCK;
1929 default: return NF4BAD;
1930 };
1931 }
1932
1933 static __be32
1934 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1935 __be32 **p, int *buflen)
1936 {
1937 int status;
1938
1939 if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1940 return nfserr_resource;
1941 if (whotype != NFS4_ACL_WHO_NAMED)
1942 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1943 else if (group)
1944 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1945 else
1946 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1947 if (status < 0)
1948 return nfserrno(status);
1949 *p = xdr_encode_opaque(*p, NULL, status);
1950 *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1951 BUG_ON(*buflen < 0);
1952 return 0;
1953 }
1954
1955 static inline __be32
1956 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1957 {
1958 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1959 }
1960
1961 static inline __be32
1962 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1963 {
1964 return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1965 }
1966
1967 static inline __be32
1968 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1969 __be32 **p, int *buflen)
1970 {
1971 return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1972 }
1973
1974 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1975 FATTR4_WORD0_RDATTR_ERROR)
1976 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1977
1978 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1979 {
1980 /* As per referral draft: */
1981 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1982 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1983 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1984 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1985 *rdattr_err = NFSERR_MOVED;
1986 else
1987 return nfserr_moved;
1988 }
1989 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1990 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1991 return 0;
1992 }
1993
1994 /*
1995 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1996 * ourselves.
1997 *
1998 * @countp is the buffer size in _words_; upon successful return this becomes
1999 * replaced with the number of words written.
2000 */
2001 __be32
2002 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2003 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2004 struct svc_rqst *rqstp, int ignore_crossmnt)
2005 {
2006 u32 bmval0 = bmval[0];
2007 u32 bmval1 = bmval[1];
2008 u32 bmval2 = bmval[2];
2009 struct kstat stat;
2010 struct svc_fh tempfh;
2011 struct kstatfs statfs;
2012 int buflen = *countp << 2;
2013 __be32 *attrlenp;
2014 u32 dummy;
2015 u64 dummy64;
2016 u32 rdattr_err = 0;
2017 __be32 *p = buffer;
2018 __be32 status;
2019 int err;
2020 int aclsupport = 0;
2021 struct nfs4_acl *acl = NULL;
2022 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2023 u32 minorversion = resp->cstate.minorversion;
2024 struct path path = {
2025 .mnt = exp->ex_path.mnt,
2026 .dentry = dentry,
2027 };
2028
2029 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2030 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2031 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2032 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2033
2034 if (exp->ex_fslocs.migrated) {
2035 BUG_ON(bmval[2]);
2036 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2037 if (status)
2038 goto out;
2039 }
2040
2041 err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2042 if (err)
2043 goto out_nfserr;
2044 if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2045 FATTR4_WORD0_MAXNAME)) ||
2046 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2047 FATTR4_WORD1_SPACE_TOTAL))) {
2048 err = vfs_statfs(&path, &statfs);
2049 if (err)
2050 goto out_nfserr;
2051 }
2052 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2053 fh_init(&tempfh, NFS4_FHSIZE);
2054 status = fh_compose(&tempfh, exp, dentry, NULL);
2055 if (status)
2056 goto out;
2057 fhp = &tempfh;
2058 }
2059 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2060 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2061 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2062 aclsupport = (err == 0);
2063 if (bmval0 & FATTR4_WORD0_ACL) {
2064 if (err == -EOPNOTSUPP)
2065 bmval0 &= ~FATTR4_WORD0_ACL;
2066 else if (err == -EINVAL) {
2067 status = nfserr_attrnotsupp;
2068 goto out;
2069 } else if (err != 0)
2070 goto out_nfserr;
2071 }
2072 }
2073
2074 if (bmval2) {
2075 if ((buflen -= 16) < 0)
2076 goto out_resource;
2077 WRITE32(3);
2078 WRITE32(bmval0);
2079 WRITE32(bmval1);
2080 WRITE32(bmval2);
2081 } else if (bmval1) {
2082 if ((buflen -= 12) < 0)
2083 goto out_resource;
2084 WRITE32(2);
2085 WRITE32(bmval0);
2086 WRITE32(bmval1);
2087 } else {
2088 if ((buflen -= 8) < 0)
2089 goto out_resource;
2090 WRITE32(1);
2091 WRITE32(bmval0);
2092 }
2093 attrlenp = p++; /* to be backfilled later */
2094
2095 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2096 u32 word0 = nfsd_suppattrs0(minorversion);
2097 u32 word1 = nfsd_suppattrs1(minorversion);
2098 u32 word2 = nfsd_suppattrs2(minorversion);
2099
2100 if (!aclsupport)
2101 word0 &= ~FATTR4_WORD0_ACL;
2102 if (!word2) {
2103 if ((buflen -= 12) < 0)
2104 goto out_resource;
2105 WRITE32(2);
2106 WRITE32(word0);
2107 WRITE32(word1);
2108 } else {
2109 if ((buflen -= 16) < 0)
2110 goto out_resource;
2111 WRITE32(3);
2112 WRITE32(word0);
2113 WRITE32(word1);
2114 WRITE32(word2);
2115 }
2116 }
2117 if (bmval0 & FATTR4_WORD0_TYPE) {
2118 if ((buflen -= 4) < 0)
2119 goto out_resource;
2120 dummy = nfs4_file_type(stat.mode);
2121 if (dummy == NF4BAD)
2122 goto out_serverfault;
2123 WRITE32(dummy);
2124 }
2125 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2126 if ((buflen -= 4) < 0)
2127 goto out_resource;
2128 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2129 WRITE32(NFS4_FH_PERSISTENT);
2130 else
2131 WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2132 }
2133 if (bmval0 & FATTR4_WORD0_CHANGE) {
2134 if ((buflen -= 8) < 0)
2135 goto out_resource;
2136 write_change(&p, &stat, dentry->d_inode);
2137 }
2138 if (bmval0 & FATTR4_WORD0_SIZE) {
2139 if ((buflen -= 8) < 0)
2140 goto out_resource;
2141 WRITE64(stat.size);
2142 }
2143 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2144 if ((buflen -= 4) < 0)
2145 goto out_resource;
2146 WRITE32(1);
2147 }
2148 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2149 if ((buflen -= 4) < 0)
2150 goto out_resource;
2151 WRITE32(1);
2152 }
2153 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2154 if ((buflen -= 4) < 0)
2155 goto out_resource;
2156 WRITE32(0);
2157 }
2158 if (bmval0 & FATTR4_WORD0_FSID) {
2159 if ((buflen -= 16) < 0)
2160 goto out_resource;
2161 if (exp->ex_fslocs.migrated) {
2162 WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2163 WRITE64(NFS4_REFERRAL_FSID_MINOR);
2164 } else switch(fsid_source(fhp)) {
2165 case FSIDSOURCE_FSID:
2166 WRITE64((u64)exp->ex_fsid);
2167 WRITE64((u64)0);
2168 break;
2169 case FSIDSOURCE_DEV:
2170 WRITE32(0);
2171 WRITE32(MAJOR(stat.dev));
2172 WRITE32(0);
2173 WRITE32(MINOR(stat.dev));
2174 break;
2175 case FSIDSOURCE_UUID:
2176 WRITEMEM(exp->ex_uuid, 16);
2177 break;
2178 }
2179 }
2180 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2181 if ((buflen -= 4) < 0)
2182 goto out_resource;
2183 WRITE32(0);
2184 }
2185 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2186 if ((buflen -= 4) < 0)
2187 goto out_resource;
2188 WRITE32(nfsd4_lease);
2189 }
2190 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2191 if ((buflen -= 4) < 0)
2192 goto out_resource;
2193 WRITE32(rdattr_err);
2194 }
2195 if (bmval0 & FATTR4_WORD0_ACL) {
2196 struct nfs4_ace *ace;
2197
2198 if (acl == NULL) {
2199 if ((buflen -= 4) < 0)
2200 goto out_resource;
2201
2202 WRITE32(0);
2203 goto out_acl;
2204 }
2205 if ((buflen -= 4) < 0)
2206 goto out_resource;
2207 WRITE32(acl->naces);
2208
2209 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2210 if ((buflen -= 4*3) < 0)
2211 goto out_resource;
2212 WRITE32(ace->type);
2213 WRITE32(ace->flag);
2214 WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2215 status = nfsd4_encode_aclname(rqstp, ace->whotype,
2216 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2217 &p, &buflen);
2218 if (status == nfserr_resource)
2219 goto out_resource;
2220 if (status)
2221 goto out;
2222 }
2223 }
2224 out_acl:
2225 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2226 if ((buflen -= 4) < 0)
2227 goto out_resource;
2228 WRITE32(aclsupport ?
2229 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2230 }
2231 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2232 if ((buflen -= 4) < 0)
2233 goto out_resource;
2234 WRITE32(1);
2235 }
2236 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2237 if ((buflen -= 4) < 0)
2238 goto out_resource;
2239 WRITE32(1);
2240 }
2241 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2242 if ((buflen -= 4) < 0)
2243 goto out_resource;
2244 WRITE32(1);
2245 }
2246 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2247 if ((buflen -= 4) < 0)
2248 goto out_resource;
2249 WRITE32(1);
2250 }
2251 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2252 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2253 if (buflen < 0)
2254 goto out_resource;
2255 WRITE32(fhp->fh_handle.fh_size);
2256 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2257 }
2258 if (bmval0 & FATTR4_WORD0_FILEID) {
2259 if ((buflen -= 8) < 0)
2260 goto out_resource;
2261 WRITE64(stat.ino);
2262 }
2263 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2264 if ((buflen -= 8) < 0)
2265 goto out_resource;
2266 WRITE64((u64) statfs.f_ffree);
2267 }
2268 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2269 if ((buflen -= 8) < 0)
2270 goto out_resource;
2271 WRITE64((u64) statfs.f_ffree);
2272 }
2273 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2274 if ((buflen -= 8) < 0)
2275 goto out_resource;
2276 WRITE64((u64) statfs.f_files);
2277 }
2278 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2279 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2280 if (status == nfserr_resource)
2281 goto out_resource;
2282 if (status)
2283 goto out;
2284 }
2285 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2286 if ((buflen -= 4) < 0)
2287 goto out_resource;
2288 WRITE32(1);
2289 }
2290 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2291 if ((buflen -= 8) < 0)
2292 goto out_resource;
2293 WRITE64(~(u64)0);
2294 }
2295 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2296 if ((buflen -= 4) < 0)
2297 goto out_resource;
2298 WRITE32(255);
2299 }
2300 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2301 if ((buflen -= 4) < 0)
2302 goto out_resource;
2303 WRITE32(statfs.f_namelen);
2304 }
2305 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2306 if ((buflen -= 8) < 0)
2307 goto out_resource;
2308 WRITE64((u64) svc_max_payload(rqstp));
2309 }
2310 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2311 if ((buflen -= 8) < 0)
2312 goto out_resource;
2313 WRITE64((u64) svc_max_payload(rqstp));
2314 }
2315 if (bmval1 & FATTR4_WORD1_MODE) {
2316 if ((buflen -= 4) < 0)
2317 goto out_resource;
2318 WRITE32(stat.mode & S_IALLUGO);
2319 }
2320 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2321 if ((buflen -= 4) < 0)
2322 goto out_resource;
2323 WRITE32(1);
2324 }
2325 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2326 if ((buflen -= 4) < 0)
2327 goto out_resource;
2328 WRITE32(stat.nlink);
2329 }
2330 if (bmval1 & FATTR4_WORD1_OWNER) {
2331 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2332 if (status == nfserr_resource)
2333 goto out_resource;
2334 if (status)
2335 goto out;
2336 }
2337 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2338 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2339 if (status == nfserr_resource)
2340 goto out_resource;
2341 if (status)
2342 goto out;
2343 }
2344 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2345 if ((buflen -= 8) < 0)
2346 goto out_resource;
2347 WRITE32((u32) MAJOR(stat.rdev));
2348 WRITE32((u32) MINOR(stat.rdev));
2349 }
2350 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2351 if ((buflen -= 8) < 0)
2352 goto out_resource;
2353 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2354 WRITE64(dummy64);
2355 }
2356 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2357 if ((buflen -= 8) < 0)
2358 goto out_resource;
2359 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2360 WRITE64(dummy64);
2361 }
2362 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2363 if ((buflen -= 8) < 0)
2364 goto out_resource;
2365 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2366 WRITE64(dummy64);
2367 }
2368 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2369 if ((buflen -= 8) < 0)
2370 goto out_resource;
2371 dummy64 = (u64)stat.blocks << 9;
2372 WRITE64(dummy64);
2373 }
2374 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2375 if ((buflen -= 12) < 0)
2376 goto out_resource;
2377 WRITE32(0);
2378 WRITE32(stat.atime.tv_sec);
2379 WRITE32(stat.atime.tv_nsec);
2380 }
2381 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2382 if ((buflen -= 12) < 0)
2383 goto out_resource;
2384 WRITE32(0);
2385 WRITE32(1);
2386 WRITE32(0);
2387 }
2388 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2389 if ((buflen -= 12) < 0)
2390 goto out_resource;
2391 WRITE32(0);
2392 WRITE32(stat.ctime.tv_sec);
2393 WRITE32(stat.ctime.tv_nsec);
2394 }
2395 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2396 if ((buflen -= 12) < 0)
2397 goto out_resource;
2398 WRITE32(0);
2399 WRITE32(stat.mtime.tv_sec);
2400 WRITE32(stat.mtime.tv_nsec);
2401 }
2402 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2403 if ((buflen -= 8) < 0)
2404 goto out_resource;
2405 /*
2406 * Get parent's attributes if not ignoring crossmount
2407 * and this is the root of a cross-mounted filesystem.
2408 */
2409 if (ignore_crossmnt == 0 &&
2410 dentry == exp->ex_path.mnt->mnt_root) {
2411 struct path path = exp->ex_path;
2412 path_get(&path);
2413 while (follow_up(&path)) {
2414 if (path.dentry != path.mnt->mnt_root)
2415 break;
2416 }
2417 err = vfs_getattr(path.mnt, path.dentry, &stat);
2418 path_put(&path);
2419 if (err)
2420 goto out_nfserr;
2421 }
2422 WRITE64(stat.ino);
2423 }
2424 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2425 WRITE32(3);
2426 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2427 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2428 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2429 }
2430
2431 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2432 *countp = p - buffer;
2433 status = nfs_ok;
2434
2435 out:
2436 kfree(acl);
2437 if (fhp == &tempfh)
2438 fh_put(&tempfh);
2439 return status;
2440 out_nfserr:
2441 status = nfserrno(err);
2442 goto out;
2443 out_resource:
2444 *countp = 0;
2445 status = nfserr_resource;
2446 goto out;
2447 out_serverfault:
2448 status = nfserr_serverfault;
2449 goto out;
2450 }
2451
2452 static inline int attributes_need_mount(u32 *bmval)
2453 {
2454 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2455 return 1;
2456 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2457 return 1;
2458 return 0;
2459 }
2460
2461 static __be32
2462 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2463 const char *name, int namlen, __be32 *p, int *buflen)
2464 {
2465 struct svc_export *exp = cd->rd_fhp->fh_export;
2466 struct dentry *dentry;
2467 __be32 nfserr;
2468 int ignore_crossmnt = 0;
2469
2470 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2471 if (IS_ERR(dentry))
2472 return nfserrno(PTR_ERR(dentry));
2473 if (!dentry->d_inode) {
2474 /*
2475 * nfsd_buffered_readdir drops the i_mutex between
2476 * readdir and calling this callback, leaving a window
2477 * where this directory entry could have gone away.
2478 */
2479 dput(dentry);
2480 return nfserr_noent;
2481 }
2482
2483 exp_get(exp);
2484 /*
2485 * In the case of a mountpoint, the client may be asking for
2486 * attributes that are only properties of the underlying filesystem
2487 * as opposed to the cross-mounted file system. In such a case,
2488 * we will not follow the cross mount and will fill the attribtutes
2489 * directly from the mountpoint dentry.
2490 */
2491 if (nfsd_mountpoint(dentry, exp)) {
2492 int err;
2493
2494 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2495 && !attributes_need_mount(cd->rd_bmval)) {
2496 ignore_crossmnt = 1;
2497 goto out_encode;
2498 }
2499 /*
2500 * Why the heck aren't we just using nfsd_lookup??
2501 * Different "."/".." handling? Something else?
2502 * At least, add a comment here to explain....
2503 */
2504 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2505 if (err) {
2506 nfserr = nfserrno(err);
2507 goto out_put;
2508 }
2509 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2510 if (nfserr)
2511 goto out_put;
2512
2513 }
2514 out_encode:
2515 nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2516 cd->rd_rqstp, ignore_crossmnt);
2517 out_put:
2518 dput(dentry);
2519 exp_put(exp);
2520 return nfserr;
2521 }
2522
2523 static __be32 *
2524 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2525 {
2526 __be32 *attrlenp;
2527
2528 if (buflen < 6)
2529 return NULL;
2530 *p++ = htonl(2);
2531 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2532 *p++ = htonl(0); /* bmval1 */
2533
2534 attrlenp = p++;
2535 *p++ = nfserr; /* no htonl */
2536 *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2537 return p;
2538 }
2539
2540 static int
2541 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2542 loff_t offset, u64 ino, unsigned int d_type)
2543 {
2544 struct readdir_cd *ccd = ccdv;
2545 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2546 int buflen;
2547 __be32 *p = cd->buffer;
2548 __be32 *cookiep;
2549 __be32 nfserr = nfserr_toosmall;
2550
2551 /* In nfsv4, "." and ".." never make it onto the wire.. */
2552 if (name && isdotent(name, namlen)) {
2553 cd->common.err = nfs_ok;
2554 return 0;
2555 }
2556
2557 if (cd->offset)
2558 xdr_encode_hyper(cd->offset, (u64) offset);
2559
2560 buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2561 if (buflen < 0)
2562 goto fail;
2563
2564 *p++ = xdr_one; /* mark entry present */
2565 cookiep = p;
2566 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2567 p = xdr_encode_array(p, name, namlen); /* name length & name */
2568
2569 nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2570 switch (nfserr) {
2571 case nfs_ok:
2572 p += buflen;
2573 break;
2574 case nfserr_resource:
2575 nfserr = nfserr_toosmall;
2576 goto fail;
2577 case nfserr_noent:
2578 goto skip_entry;
2579 default:
2580 /*
2581 * If the client requested the RDATTR_ERROR attribute,
2582 * we stuff the error code into this attribute
2583 * and continue. If this attribute was not requested,
2584 * then in accordance with the spec, we fail the
2585 * entire READDIR operation(!)
2586 */
2587 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2588 goto fail;
2589 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2590 if (p == NULL) {
2591 nfserr = nfserr_toosmall;
2592 goto fail;
2593 }
2594 }
2595 cd->buflen -= (p - cd->buffer);
2596 cd->buffer = p;
2597 cd->offset = cookiep;
2598 skip_entry:
2599 cd->common.err = nfs_ok;
2600 return 0;
2601 fail:
2602 cd->common.err = nfserr;
2603 return -EINVAL;
2604 }
2605
2606 static void
2607 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2608 {
2609 __be32 *p;
2610
2611 RESERVE_SPACE(sizeof(stateid_t));
2612 WRITE32(sid->si_generation);
2613 WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2614 ADJUST_ARGS();
2615 }
2616
2617 static __be32
2618 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2619 {
2620 __be32 *p;
2621
2622 if (!nfserr) {
2623 RESERVE_SPACE(8);
2624 WRITE32(access->ac_supported);
2625 WRITE32(access->ac_resp_access);
2626 ADJUST_ARGS();
2627 }
2628 return nfserr;
2629 }
2630
2631 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2632 {
2633 __be32 *p;
2634
2635 if (!nfserr) {
2636 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2637 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2638 WRITE32(bcts->dir);
2639 /* XXX: ? */
2640 WRITE32(0);
2641 ADJUST_ARGS();
2642 }
2643 return nfserr;
2644 }
2645
2646 static __be32
2647 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2648 {
2649 ENCODE_SEQID_OP_HEAD;
2650
2651 if (!nfserr)
2652 nfsd4_encode_stateid(resp, &close->cl_stateid);
2653
2654 encode_seqid_op_tail(resp, save, nfserr);
2655 return nfserr;
2656 }
2657
2658
2659 static __be32
2660 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2661 {
2662 __be32 *p;
2663
2664 if (!nfserr) {
2665 RESERVE_SPACE(8);
2666 WRITEMEM(commit->co_verf.data, 8);
2667 ADJUST_ARGS();
2668 }
2669 return nfserr;
2670 }
2671
2672 static __be32
2673 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2674 {
2675 __be32 *p;
2676
2677 if (!nfserr) {
2678 RESERVE_SPACE(32);
2679 write_cinfo(&p, &create->cr_cinfo);
2680 WRITE32(2);
2681 WRITE32(create->cr_bmval[0]);
2682 WRITE32(create->cr_bmval[1]);
2683 ADJUST_ARGS();
2684 }
2685 return nfserr;
2686 }
2687
2688 static __be32
2689 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2690 {
2691 struct svc_fh *fhp = getattr->ga_fhp;
2692 int buflen;
2693
2694 if (nfserr)
2695 return nfserr;
2696
2697 buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2698 nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2699 resp->p, &buflen, getattr->ga_bmval,
2700 resp->rqstp, 0);
2701 if (!nfserr)
2702 resp->p += buflen;
2703 return nfserr;
2704 }
2705
2706 static __be32
2707 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2708 {
2709 struct svc_fh *fhp = *fhpp;
2710 unsigned int len;
2711 __be32 *p;
2712
2713 if (!nfserr) {
2714 len = fhp->fh_handle.fh_size;
2715 RESERVE_SPACE(len + 4);
2716 WRITE32(len);
2717 WRITEMEM(&fhp->fh_handle.fh_base, len);
2718 ADJUST_ARGS();
2719 }
2720 return nfserr;
2721 }
2722
2723 /*
2724 * Including all fields other than the name, a LOCK4denied structure requires
2725 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2726 */
2727 static void
2728 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2729 {
2730 struct xdr_netobj *conf = &ld->ld_owner;
2731 __be32 *p;
2732
2733 RESERVE_SPACE(32 + XDR_LEN(conf->len));
2734 WRITE64(ld->ld_start);
2735 WRITE64(ld->ld_length);
2736 WRITE32(ld->ld_type);
2737 if (conf->len) {
2738 WRITEMEM(&ld->ld_clientid, 8);
2739 WRITE32(conf->len);
2740 WRITEMEM(conf->data, conf->len);
2741 kfree(conf->data);
2742 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2743 WRITE64((u64)0); /* clientid */
2744 WRITE32(0); /* length of owner name */
2745 }
2746 ADJUST_ARGS();
2747 }
2748
2749 static __be32
2750 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2751 {
2752 ENCODE_SEQID_OP_HEAD;
2753
2754 if (!nfserr)
2755 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2756 else if (nfserr == nfserr_denied)
2757 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2758
2759 encode_seqid_op_tail(resp, save, nfserr);
2760 return nfserr;
2761 }
2762
2763 static __be32
2764 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2765 {
2766 if (nfserr == nfserr_denied)
2767 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2768 return nfserr;
2769 }
2770
2771 static __be32
2772 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2773 {
2774 ENCODE_SEQID_OP_HEAD;
2775
2776 if (!nfserr)
2777 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2778
2779 encode_seqid_op_tail(resp, save, nfserr);
2780 return nfserr;
2781 }
2782
2783
2784 static __be32
2785 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2786 {
2787 __be32 *p;
2788
2789 if (!nfserr) {
2790 RESERVE_SPACE(20);
2791 write_cinfo(&p, &link->li_cinfo);
2792 ADJUST_ARGS();
2793 }
2794 return nfserr;
2795 }
2796
2797
2798 static __be32
2799 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2800 {
2801 __be32 *p;
2802 ENCODE_SEQID_OP_HEAD;
2803
2804 if (nfserr)
2805 goto out;
2806
2807 nfsd4_encode_stateid(resp, &open->op_stateid);
2808 RESERVE_SPACE(40);
2809 write_cinfo(&p, &open->op_cinfo);
2810 WRITE32(open->op_rflags);
2811 WRITE32(2);
2812 WRITE32(open->op_bmval[0]);
2813 WRITE32(open->op_bmval[1]);
2814 WRITE32(open->op_delegate_type);
2815 ADJUST_ARGS();
2816
2817 switch (open->op_delegate_type) {
2818 case NFS4_OPEN_DELEGATE_NONE:
2819 break;
2820 case NFS4_OPEN_DELEGATE_READ:
2821 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2822 RESERVE_SPACE(20);
2823 WRITE32(open->op_recall);
2824
2825 /*
2826 * TODO: ACE's in delegations
2827 */
2828 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2829 WRITE32(0);
2830 WRITE32(0);
2831 WRITE32(0); /* XXX: is NULL principal ok? */
2832 ADJUST_ARGS();
2833 break;
2834 case NFS4_OPEN_DELEGATE_WRITE:
2835 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2836 RESERVE_SPACE(32);
2837 WRITE32(0);
2838
2839 /*
2840 * TODO: space_limit's in delegations
2841 */
2842 WRITE32(NFS4_LIMIT_SIZE);
2843 WRITE32(~(u32)0);
2844 WRITE32(~(u32)0);
2845
2846 /*
2847 * TODO: ACE's in delegations
2848 */
2849 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2850 WRITE32(0);
2851 WRITE32(0);
2852 WRITE32(0); /* XXX: is NULL principal ok? */
2853 ADJUST_ARGS();
2854 break;
2855 default:
2856 BUG();
2857 }
2858 /* XXX save filehandle here */
2859 out:
2860 encode_seqid_op_tail(resp, save, nfserr);
2861 return nfserr;
2862 }
2863
2864 static __be32
2865 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2866 {
2867 ENCODE_SEQID_OP_HEAD;
2868
2869 if (!nfserr)
2870 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2871
2872 encode_seqid_op_tail(resp, save, nfserr);
2873 return nfserr;
2874 }
2875
2876 static __be32
2877 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2878 {
2879 ENCODE_SEQID_OP_HEAD;
2880
2881 if (!nfserr)
2882 nfsd4_encode_stateid(resp, &od->od_stateid);
2883
2884 encode_seqid_op_tail(resp, save, nfserr);
2885 return nfserr;
2886 }
2887
2888 static __be32
2889 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2890 struct nfsd4_read *read)
2891 {
2892 u32 eof;
2893 int v, pn;
2894 unsigned long maxcount;
2895 long len;
2896 __be32 *p;
2897
2898 if (nfserr)
2899 return nfserr;
2900 if (resp->xbuf->page_len)
2901 return nfserr_resource;
2902
2903 RESERVE_SPACE(8); /* eof flag and byte count */
2904
2905 maxcount = svc_max_payload(resp->rqstp);
2906 if (maxcount > read->rd_length)
2907 maxcount = read->rd_length;
2908
2909 len = maxcount;
2910 v = 0;
2911 while (len > 0) {
2912 pn = resp->rqstp->rq_resused++;
2913 resp->rqstp->rq_vec[v].iov_base =
2914 page_address(resp->rqstp->rq_respages[pn]);
2915 resp->rqstp->rq_vec[v].iov_len =
2916 len < PAGE_SIZE ? len : PAGE_SIZE;
2917 v++;
2918 len -= PAGE_SIZE;
2919 }
2920 read->rd_vlen = v;
2921
2922 nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2923 read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2924 &maxcount);
2925
2926 if (nfserr)
2927 return nfserr;
2928 eof = (read->rd_offset + maxcount >=
2929 read->rd_fhp->fh_dentry->d_inode->i_size);
2930
2931 WRITE32(eof);
2932 WRITE32(maxcount);
2933 ADJUST_ARGS();
2934 resp->xbuf->head[0].iov_len = (char*)p
2935 - (char*)resp->xbuf->head[0].iov_base;
2936 resp->xbuf->page_len = maxcount;
2937
2938 /* Use rest of head for padding and remaining ops: */
2939 resp->xbuf->tail[0].iov_base = p;
2940 resp->xbuf->tail[0].iov_len = 0;
2941 if (maxcount&3) {
2942 RESERVE_SPACE(4);
2943 WRITE32(0);
2944 resp->xbuf->tail[0].iov_base += maxcount&3;
2945 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2946 ADJUST_ARGS();
2947 }
2948 return 0;
2949 }
2950
2951 static __be32
2952 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2953 {
2954 int maxcount;
2955 char *page;
2956 __be32 *p;
2957
2958 if (nfserr)
2959 return nfserr;
2960 if (resp->xbuf->page_len)
2961 return nfserr_resource;
2962
2963 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2964
2965 maxcount = PAGE_SIZE;
2966 RESERVE_SPACE(4);
2967
2968 /*
2969 * XXX: By default, the ->readlink() VFS op will truncate symlinks
2970 * if they would overflow the buffer. Is this kosher in NFSv4? If
2971 * not, one easy fix is: if ->readlink() precisely fills the buffer,
2972 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2973 */
2974 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2975 if (nfserr == nfserr_isdir)
2976 return nfserr_inval;
2977 if (nfserr)
2978 return nfserr;
2979
2980 WRITE32(maxcount);
2981 ADJUST_ARGS();
2982 resp->xbuf->head[0].iov_len = (char*)p
2983 - (char*)resp->xbuf->head[0].iov_base;
2984 resp->xbuf->page_len = maxcount;
2985
2986 /* Use rest of head for padding and remaining ops: */
2987 resp->xbuf->tail[0].iov_base = p;
2988 resp->xbuf->tail[0].iov_len = 0;
2989 if (maxcount&3) {
2990 RESERVE_SPACE(4);
2991 WRITE32(0);
2992 resp->xbuf->tail[0].iov_base += maxcount&3;
2993 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2994 ADJUST_ARGS();
2995 }
2996 return 0;
2997 }
2998
2999 static __be32
3000 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3001 {
3002 int maxcount;
3003 loff_t offset;
3004 __be32 *page, *savep, *tailbase;
3005 __be32 *p;
3006
3007 if (nfserr)
3008 return nfserr;
3009 if (resp->xbuf->page_len)
3010 return nfserr_resource;
3011
3012 RESERVE_SPACE(8); /* verifier */
3013 savep = p;
3014
3015 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3016 WRITE32(0);
3017 WRITE32(0);
3018 ADJUST_ARGS();
3019 resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3020 tailbase = p;
3021
3022 maxcount = PAGE_SIZE;
3023 if (maxcount > readdir->rd_maxcount)
3024 maxcount = readdir->rd_maxcount;
3025
3026 /*
3027 * Convert from bytes to words, account for the two words already
3028 * written, make sure to leave two words at the end for the next
3029 * pointer and eof field.
3030 */
3031 maxcount = (maxcount >> 2) - 4;
3032 if (maxcount < 0) {
3033 nfserr = nfserr_toosmall;
3034 goto err_no_verf;
3035 }
3036
3037 page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3038 readdir->common.err = 0;
3039 readdir->buflen = maxcount;
3040 readdir->buffer = page;
3041 readdir->offset = NULL;
3042
3043 offset = readdir->rd_cookie;
3044 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3045 &offset,
3046 &readdir->common, nfsd4_encode_dirent);
3047 if (nfserr == nfs_ok &&
3048 readdir->common.err == nfserr_toosmall &&
3049 readdir->buffer == page)
3050 nfserr = nfserr_toosmall;
3051 if (nfserr)
3052 goto err_no_verf;
3053
3054 if (readdir->offset)
3055 xdr_encode_hyper(readdir->offset, offset);
3056
3057 p = readdir->buffer;
3058 *p++ = 0; /* no more entries */
3059 *p++ = htonl(readdir->common.err == nfserr_eof);
3060 resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3061 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3062
3063 /* Use rest of head for padding and remaining ops: */
3064 resp->xbuf->tail[0].iov_base = tailbase;
3065 resp->xbuf->tail[0].iov_len = 0;
3066 resp->p = resp->xbuf->tail[0].iov_base;
3067 resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3068
3069 return 0;
3070 err_no_verf:
3071 p = savep;
3072 ADJUST_ARGS();
3073 return nfserr;
3074 }
3075
3076 static __be32
3077 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3078 {
3079 __be32 *p;
3080
3081 if (!nfserr) {
3082 RESERVE_SPACE(20);
3083 write_cinfo(&p, &remove->rm_cinfo);
3084 ADJUST_ARGS();
3085 }
3086 return nfserr;
3087 }
3088
3089 static __be32
3090 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3091 {
3092 __be32 *p;
3093
3094 if (!nfserr) {
3095 RESERVE_SPACE(40);
3096 write_cinfo(&p, &rename->rn_sinfo);
3097 write_cinfo(&p, &rename->rn_tinfo);
3098 ADJUST_ARGS();
3099 }
3100 return nfserr;
3101 }
3102
3103 static __be32
3104 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3105 __be32 nfserr,struct svc_export *exp)
3106 {
3107 int i = 0;
3108 u32 nflavs;
3109 struct exp_flavor_info *flavs;
3110 struct exp_flavor_info def_flavs[2];
3111 __be32 *p;
3112
3113 if (nfserr)
3114 goto out;
3115 if (exp->ex_nflavors) {
3116 flavs = exp->ex_flavors;
3117 nflavs = exp->ex_nflavors;
3118 } else { /* Handling of some defaults in absence of real secinfo: */
3119 flavs = def_flavs;
3120 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3121 nflavs = 2;
3122 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3123 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3124 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3125 nflavs = 1;
3126 flavs[0].pseudoflavor
3127 = svcauth_gss_flavor(exp->ex_client);
3128 } else {
3129 nflavs = 1;
3130 flavs[0].pseudoflavor
3131 = exp->ex_client->flavour->flavour;
3132 }
3133 }
3134
3135 RESERVE_SPACE(4);
3136 WRITE32(nflavs);
3137 ADJUST_ARGS();
3138 for (i = 0; i < nflavs; i++) {
3139 u32 flav = flavs[i].pseudoflavor;
3140 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3141
3142 if (gm) {
3143 RESERVE_SPACE(4);
3144 WRITE32(RPC_AUTH_GSS);
3145 ADJUST_ARGS();
3146 RESERVE_SPACE(4 + gm->gm_oid.len);
3147 WRITE32(gm->gm_oid.len);
3148 WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3149 ADJUST_ARGS();
3150 RESERVE_SPACE(4);
3151 WRITE32(0); /* qop */
3152 ADJUST_ARGS();
3153 RESERVE_SPACE(4);
3154 WRITE32(gss_pseudoflavor_to_service(gm, flav));
3155 ADJUST_ARGS();
3156 gss_mech_put(gm);
3157 } else {
3158 RESERVE_SPACE(4);
3159 WRITE32(flav);
3160 ADJUST_ARGS();
3161 }
3162 }
3163 out:
3164 if (exp)
3165 exp_put(exp);
3166 return nfserr;
3167 }
3168
3169 static __be32
3170 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3171 struct nfsd4_secinfo *secinfo)
3172 {
3173 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3174 }
3175
3176 static __be32
3177 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3178 struct nfsd4_secinfo_no_name *secinfo)
3179 {
3180 return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3181 }
3182
3183 /*
3184 * The SETATTR encode routine is special -- it always encodes a bitmap,
3185 * regardless of the error status.
3186 */
3187 static __be32
3188 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3189 {
3190 __be32 *p;
3191
3192 RESERVE_SPACE(12);
3193 if (nfserr) {
3194 WRITE32(2);
3195 WRITE32(0);
3196 WRITE32(0);
3197 }
3198 else {
3199 WRITE32(2);
3200 WRITE32(setattr->sa_bmval[0]);
3201 WRITE32(setattr->sa_bmval[1]);
3202 }
3203 ADJUST_ARGS();
3204 return nfserr;
3205 }
3206
3207 static __be32
3208 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3209 {
3210 __be32 *p;
3211
3212 if (!nfserr) {
3213 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3214 WRITEMEM(&scd->se_clientid, 8);
3215 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3216 ADJUST_ARGS();
3217 }
3218 else if (nfserr == nfserr_clid_inuse) {
3219 RESERVE_SPACE(8);
3220 WRITE32(0);
3221 WRITE32(0);
3222 ADJUST_ARGS();
3223 }
3224 return nfserr;
3225 }
3226
3227 static __be32
3228 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3229 {
3230 __be32 *p;
3231
3232 if (!nfserr) {
3233 RESERVE_SPACE(16);
3234 WRITE32(write->wr_bytes_written);
3235 WRITE32(write->wr_how_written);
3236 WRITEMEM(write->wr_verifier.data, 8);
3237 ADJUST_ARGS();
3238 }
3239 return nfserr;
3240 }
3241
3242 static __be32
3243 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3244 struct nfsd4_exchange_id *exid)
3245 {
3246 __be32 *p;
3247 char *major_id;
3248 char *server_scope;
3249 int major_id_sz;
3250 int server_scope_sz;
3251 uint64_t minor_id = 0;
3252
3253 if (nfserr)
3254 return nfserr;
3255
3256 major_id = utsname()->nodename;
3257 major_id_sz = strlen(major_id);
3258 server_scope = utsname()->nodename;
3259 server_scope_sz = strlen(server_scope);
3260
3261 RESERVE_SPACE(
3262 8 /* eir_clientid */ +
3263 4 /* eir_sequenceid */ +
3264 4 /* eir_flags */ +
3265 4 /* spr_how (SP4_NONE) */ +
3266 8 /* so_minor_id */ +
3267 4 /* so_major_id.len */ +
3268 (XDR_QUADLEN(major_id_sz) * 4) +
3269 4 /* eir_server_scope.len */ +
3270 (XDR_QUADLEN(server_scope_sz) * 4) +
3271 4 /* eir_server_impl_id.count (0) */);
3272
3273 WRITEMEM(&exid->clientid, 8);
3274 WRITE32(exid->seqid);
3275 WRITE32(exid->flags);
3276
3277 /* state_protect4_r. Currently only support SP4_NONE */
3278 BUG_ON(exid->spa_how != SP4_NONE);
3279 WRITE32(exid->spa_how);
3280
3281 /* The server_owner struct */
3282 WRITE64(minor_id); /* Minor id */
3283 /* major id */
3284 WRITE32(major_id_sz);
3285 WRITEMEM(major_id, major_id_sz);
3286
3287 /* Server scope */
3288 WRITE32(server_scope_sz);
3289 WRITEMEM(server_scope, server_scope_sz);
3290
3291 /* Implementation id */
3292 WRITE32(0); /* zero length nfs_impl_id4 array */
3293 ADJUST_ARGS();
3294 return 0;
3295 }
3296
3297 static __be32
3298 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3299 struct nfsd4_create_session *sess)
3300 {
3301 __be32 *p;
3302
3303 if (nfserr)
3304 return nfserr;
3305
3306 RESERVE_SPACE(24);
3307 WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3308 WRITE32(sess->seqid);
3309 WRITE32(sess->flags);
3310 ADJUST_ARGS();
3311
3312 RESERVE_SPACE(28);
3313 WRITE32(0); /* headerpadsz */
3314 WRITE32(sess->fore_channel.maxreq_sz);
3315 WRITE32(sess->fore_channel.maxresp_sz);
3316 WRITE32(sess->fore_channel.maxresp_cached);
3317 WRITE32(sess->fore_channel.maxops);
3318 WRITE32(sess->fore_channel.maxreqs);
3319 WRITE32(sess->fore_channel.nr_rdma_attrs);
3320 ADJUST_ARGS();
3321
3322 if (sess->fore_channel.nr_rdma_attrs) {
3323 RESERVE_SPACE(4);
3324 WRITE32(sess->fore_channel.rdma_attrs);
3325 ADJUST_ARGS();
3326 }
3327
3328 RESERVE_SPACE(28);
3329 WRITE32(0); /* headerpadsz */
3330 WRITE32(sess->back_channel.maxreq_sz);
3331 WRITE32(sess->back_channel.maxresp_sz);
3332 WRITE32(sess->back_channel.maxresp_cached);
3333 WRITE32(sess->back_channel.maxops);
3334 WRITE32(sess->back_channel.maxreqs);
3335 WRITE32(sess->back_channel.nr_rdma_attrs);
3336 ADJUST_ARGS();
3337
3338 if (sess->back_channel.nr_rdma_attrs) {
3339 RESERVE_SPACE(4);
3340 WRITE32(sess->back_channel.rdma_attrs);
3341 ADJUST_ARGS();
3342 }
3343 return 0;
3344 }
3345
3346 static __be32
3347 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3348 struct nfsd4_destroy_session *destroy_session)
3349 {
3350 return nfserr;
3351 }
3352
3353 static __be32
3354 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3355 struct nfsd4_free_stateid *free_stateid)
3356 {
3357 __be32 *p;
3358
3359 if (nfserr)
3360 return nfserr;
3361
3362 RESERVE_SPACE(4);
3363 WRITE32(nfserr);
3364 ADJUST_ARGS();
3365 return nfserr;
3366 }
3367
3368 static __be32
3369 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3370 struct nfsd4_sequence *seq)
3371 {
3372 __be32 *p;
3373
3374 if (nfserr)
3375 return nfserr;
3376
3377 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3378 WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3379 WRITE32(seq->seqid);
3380 WRITE32(seq->slotid);
3381 /* Note slotid's are numbered from zero: */
3382 WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3383 WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3384 WRITE32(seq->status_flags);
3385
3386 ADJUST_ARGS();
3387 resp->cstate.datap = p; /* DRC cache data pointer */
3388 return 0;
3389 }
3390
3391 __be32
3392 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3393 struct nfsd4_test_stateid *test_stateid)
3394 {
3395 struct nfsd4_compoundargs *argp;
3396 struct nfs4_client *cl = resp->cstate.session->se_client;
3397 stateid_t si;
3398 __be32 *p;
3399 int i;
3400 int valid;
3401
3402 restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3403 argp = test_stateid->ts_saved_args;
3404
3405 RESERVE_SPACE(4);
3406 *p++ = htonl(test_stateid->ts_num_ids);
3407 resp->p = p;
3408
3409 nfs4_lock_state();
3410 for (i = 0; i < test_stateid->ts_num_ids; i++) {
3411 nfsd4_decode_stateid(argp, &si);
3412 valid = nfs4_validate_stateid(cl, &si);
3413 RESERVE_SPACE(4);
3414 *p++ = htonl(valid);
3415 resp->p = p;
3416 }
3417 nfs4_unlock_state();
3418
3419 return nfserr;
3420 }
3421
3422 static __be32
3423 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3424 {
3425 return nfserr;
3426 }
3427
3428 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3429
3430 /*
3431 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3432 * since we don't need to filter out obsolete ops as this is
3433 * done in the decoding phase.
3434 */
3435 static nfsd4_enc nfsd4_enc_ops[] = {
3436 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3437 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3438 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3439 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3440 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3441 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3442 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3443 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3444 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3445 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3446 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3447 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3448 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3449 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3450 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3451 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3452 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3453 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3454 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3455 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3456 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3457 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3458 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3459 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3460 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3461 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3462 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3463 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3464 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3465 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3466 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3467 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3468 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3469 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3470 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3471 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3472 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3473
3474 /* NFSv4.1 operations */
3475 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3476 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3477 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3478 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3479 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_destroy_session,
3480 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_free_stateid,
3481 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3482 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3483 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3484 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3485 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3486 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3487 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3488 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3489 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3490 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3491 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3492 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3493 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3494 };
3495
3496 /*
3497 * Calculate the total amount of memory that the compound response has taken
3498 * after encoding the current operation with pad.
3499 *
3500 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3501 * which was specified at nfsd4_operation, else pad is zero.
3502 *
3503 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3504 *
3505 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3506 * will be at least a page and will therefore hold the xdr_buf head.
3507 */
3508 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3509 {
3510 struct xdr_buf *xb = &resp->rqstp->rq_res;
3511 struct nfsd4_session *session = NULL;
3512 struct nfsd4_slot *slot = resp->cstate.slot;
3513 u32 length, tlen = 0;
3514
3515 if (!nfsd4_has_session(&resp->cstate))
3516 return 0;
3517
3518 session = resp->cstate.session;
3519 if (session == NULL)
3520 return 0;
3521
3522 if (xb->page_len == 0) {
3523 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3524 } else {
3525 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3526 tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3527
3528 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3529 }
3530 dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3531 length, xb->page_len, tlen, pad);
3532
3533 if (length > session->se_fchannel.maxresp_sz)
3534 return nfserr_rep_too_big;
3535
3536 if (slot->sl_cachethis == 1 &&
3537 length > session->se_fchannel.maxresp_cached)
3538 return nfserr_rep_too_big_to_cache;
3539
3540 return 0;
3541 }
3542
3543 void
3544 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3545 {
3546 __be32 *statp;
3547 __be32 *p;
3548
3549 RESERVE_SPACE(8);
3550 WRITE32(op->opnum);
3551 statp = p++; /* to be backfilled at the end */
3552 ADJUST_ARGS();
3553
3554 if (op->opnum == OP_ILLEGAL)
3555 goto status;
3556 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3557 !nfsd4_enc_ops[op->opnum]);
3558 op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3559 /* nfsd4_check_drc_limit guarantees enough room for error status */
3560 if (!op->status)
3561 op->status = nfsd4_check_resp_size(resp, 0);
3562 status:
3563 /*
3564 * Note: We write the status directly, instead of using WRITE32(),
3565 * since it is already in network byte order.
3566 */
3567 *statp = op->status;
3568 }
3569
3570 /*
3571 * Encode the reply stored in the stateowner reply cache
3572 *
3573 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3574 * previously sent already encoded operation.
3575 *
3576 * called with nfs4_lock_state() held
3577 */
3578 void
3579 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3580 {
3581 __be32 *p;
3582 struct nfs4_replay *rp = op->replay;
3583
3584 BUG_ON(!rp);
3585
3586 RESERVE_SPACE(8);
3587 WRITE32(op->opnum);
3588 *p++ = rp->rp_status; /* already xdr'ed */
3589 ADJUST_ARGS();
3590
3591 RESERVE_SPACE(rp->rp_buflen);
3592 WRITEMEM(rp->rp_buf, rp->rp_buflen);
3593 ADJUST_ARGS();
3594 }
3595
3596 int
3597 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3598 {
3599 return xdr_ressize_check(rqstp, p);
3600 }
3601
3602 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3603 {
3604 struct svc_rqst *rqstp = rq;
3605 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3606
3607 if (args->ops != args->iops) {
3608 kfree(args->ops);
3609 args->ops = args->iops;
3610 }
3611 kfree(args->tmpp);
3612 args->tmpp = NULL;
3613 while (args->to_free) {
3614 struct tmpbuf *tb = args->to_free;
3615 args->to_free = tb->next;
3616 tb->release(tb->buf);
3617 kfree(tb);
3618 }
3619 return 1;
3620 }
3621
3622 int
3623 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3624 {
3625 args->p = p;
3626 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3627 args->pagelist = rqstp->rq_arg.pages;
3628 args->pagelen = rqstp->rq_arg.page_len;
3629 args->tmpp = NULL;
3630 args->to_free = NULL;
3631 args->ops = args->iops;
3632 args->rqstp = rqstp;
3633
3634 return !nfsd4_decode_compound(args);
3635 }
3636
3637 int
3638 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3639 {
3640 /*
3641 * All that remains is to write the tag and operation count...
3642 */
3643 struct nfsd4_compound_state *cs = &resp->cstate;
3644 struct kvec *iov;
3645 p = resp->tagp;
3646 *p++ = htonl(resp->taglen);
3647 memcpy(p, resp->tag, resp->taglen);
3648 p += XDR_QUADLEN(resp->taglen);
3649 *p++ = htonl(resp->opcnt);
3650
3651 if (rqstp->rq_res.page_len)
3652 iov = &rqstp->rq_res.tail[0];
3653 else
3654 iov = &rqstp->rq_res.head[0];
3655 iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3656 BUG_ON(iov->iov_len > PAGE_SIZE);
3657 if (nfsd4_has_session(cs)) {
3658 if (cs->status != nfserr_replay_cache) {
3659 nfsd4_store_cache_entry(resp);
3660 dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3661 cs->slot->sl_inuse = false;
3662 }
3663 /* Renew the clientid on success and on replay */
3664 release_session_client(cs->session);
3665 nfsd4_put_session(cs->session);
3666 }
3667 return 1;
3668 }
3669
3670 /*
3671 * Local variables:
3672 * c-basic-offset: 8
3673 * End:
3674 */
Mirror of the linux-mips.org kernel tree