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1/*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#include <linux/file.h>
37#include <linux/slab.h>
38#include <linux/namei.h>
39#include <linux/statfs.h>
40#include <linux/utsname.h>
41#include <linux/pagemap.h>
42#include <linux/sunrpc/svcauth_gss.h>
43
44#include "idmap.h"
45#include "acl.h"
46#include "xdr4.h"
47#include "vfs.h"
48#include "state.h"
49#include "cache.h"
50#include "netns.h"
51#include "pnfs.h"
52
53#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54#include <linux/security.h>
55#endif
56
57
58#define NFSDDBG_FACILITY NFSDDBG_XDR
59
60/*
61 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
62 * directory in order to indicate to the client that a filesystem boundary is present
63 * We use a fixed fsid for a referral
64 */
65#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
66#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
67
68static __be32
69check_filename(char *str, int len)
70{
71 int i;
72
73 if (len == 0)
74 return nfserr_inval;
75 if (isdotent(str, len))
76 return nfserr_badname;
77 for (i = 0; i < len; i++)
78 if (str[i] == '/')
79 return nfserr_badname;
80 return 0;
81}
82
83#define DECODE_HEAD \
84 __be32 *p; \
85 __be32 status
86#define DECODE_TAIL \
87 status = 0; \
88out: \
89 return status; \
90xdr_error: \
91 dprintk("NFSD: xdr error (%s:%d)\n", \
92 __FILE__, __LINE__); \
93 status = nfserr_bad_xdr; \
94 goto out
95
96#define READMEM(x,nbytes) do { \
97 x = (char *)p; \
98 p += XDR_QUADLEN(nbytes); \
99} while (0)
100#define SAVEMEM(x,nbytes) do { \
101 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
102 savemem(argp, p, nbytes) : \
103 (char *)p)) { \
104 dprintk("NFSD: xdr error (%s:%d)\n", \
105 __FILE__, __LINE__); \
106 goto xdr_error; \
107 } \
108 p += XDR_QUADLEN(nbytes); \
109} while (0)
110#define COPYMEM(x,nbytes) do { \
111 memcpy((x), p, nbytes); \
112 p += XDR_QUADLEN(nbytes); \
113} while (0)
114
115/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
116#define READ_BUF(nbytes) do { \
117 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
118 p = argp->p; \
119 argp->p += XDR_QUADLEN(nbytes); \
120 } else if (!(p = read_buf(argp, nbytes))) { \
121 dprintk("NFSD: xdr error (%s:%d)\n", \
122 __FILE__, __LINE__); \
123 goto xdr_error; \
124 } \
125} while (0)
126
127static void next_decode_page(struct nfsd4_compoundargs *argp)
128{
129 argp->p = page_address(argp->pagelist[0]);
130 argp->pagelist++;
131 if (argp->pagelen < PAGE_SIZE) {
132 argp->end = argp->p + (argp->pagelen>>2);
133 argp->pagelen = 0;
134 } else {
135 argp->end = argp->p + (PAGE_SIZE>>2);
136 argp->pagelen -= PAGE_SIZE;
137 }
138}
139
140static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
141{
142 /* We want more bytes than seem to be available.
143 * Maybe we need a new page, maybe we have just run out
144 */
145 unsigned int avail = (char *)argp->end - (char *)argp->p;
146 __be32 *p;
147 if (avail + argp->pagelen < nbytes)
148 return NULL;
149 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
150 return NULL;
151 /* ok, we can do it with the current plus the next page */
152 if (nbytes <= sizeof(argp->tmp))
153 p = argp->tmp;
154 else {
155 kfree(argp->tmpp);
156 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
157 if (!p)
158 return NULL;
159
160 }
161 /*
162 * The following memcpy is safe because read_buf is always
163 * called with nbytes > avail, and the two cases above both
164 * guarantee p points to at least nbytes bytes.
165 */
166 memcpy(p, argp->p, avail);
167 next_decode_page(argp);
168 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
169 argp->p += XDR_QUADLEN(nbytes - avail);
170 return p;
171}
172
173static int zero_clientid(clientid_t *clid)
174{
175 return (clid->cl_boot == 0) && (clid->cl_id == 0);
176}
177
178/**
179 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
180 * @argp: NFSv4 compound argument structure
181 * @p: pointer to be freed (with kfree())
182 *
183 * Marks @p to be freed when processing the compound operation
184 * described in @argp finishes.
185 */
186static void *
187svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
188{
189 struct svcxdr_tmpbuf *tb;
190
191 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
192 if (!tb)
193 return NULL;
194 tb->next = argp->to_free;
195 argp->to_free = tb;
196 return tb->buf;
197}
198
199/*
200 * For xdr strings that need to be passed to other kernel api's
201 * as null-terminated strings.
202 *
203 * Note null-terminating in place usually isn't safe since the
204 * buffer might end on a page boundary.
205 */
206static char *
207svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
208{
209 char *p = svcxdr_tmpalloc(argp, len + 1);
210
211 if (!p)
212 return NULL;
213 memcpy(p, buf, len);
214 p[len] = '\0';
215 return p;
216}
217
218/**
219 * savemem - duplicate a chunk of memory for later processing
220 * @argp: NFSv4 compound argument structure to be freed with
221 * @p: pointer to be duplicated
222 * @nbytes: length to be duplicated
223 *
224 * Returns a pointer to a copy of @nbytes bytes of memory at @p
225 * that are preserved until processing of the NFSv4 compound
226 * operation described by @argp finishes.
227 */
228static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
229{
230 void *ret;
231
232 ret = svcxdr_tmpalloc(argp, nbytes);
233 if (!ret)
234 return NULL;
235 memcpy(ret, p, nbytes);
236 return ret;
237}
238
239/*
240 * We require the high 32 bits of 'seconds' to be 0, and
241 * we ignore all 32 bits of 'nseconds'.
242 */
243static __be32
244nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
245{
246 DECODE_HEAD;
247 u64 sec;
248
249 READ_BUF(12);
250 p = xdr_decode_hyper(p, &sec);
251 tv->tv_sec = sec;
252 tv->tv_nsec = be32_to_cpup(p++);
253 if (tv->tv_nsec >= (u32)1000000000)
254 return nfserr_inval;
255
256 DECODE_TAIL;
257}
258
259static __be32
260nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
261{
262 u32 bmlen;
263 DECODE_HEAD;
264
265 bmval[0] = 0;
266 bmval[1] = 0;
267 bmval[2] = 0;
268
269 READ_BUF(4);
270 bmlen = be32_to_cpup(p++);
271 if (bmlen > 1000)
272 goto xdr_error;
273
274 READ_BUF(bmlen << 2);
275 if (bmlen > 0)
276 bmval[0] = be32_to_cpup(p++);
277 if (bmlen > 1)
278 bmval[1] = be32_to_cpup(p++);
279 if (bmlen > 2)
280 bmval[2] = be32_to_cpup(p++);
281
282 DECODE_TAIL;
283}
284
285static __be32
286nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
287 struct iattr *iattr, struct nfs4_acl **acl,
288 struct xdr_netobj *label)
289{
290 int expected_len, len = 0;
291 u32 dummy32;
292 char *buf;
293
294 DECODE_HEAD;
295 iattr->ia_valid = 0;
296 if ((status = nfsd4_decode_bitmap(argp, bmval)))
297 return status;
298
299 READ_BUF(4);
300 expected_len = be32_to_cpup(p++);
301
302 if (bmval[0] & FATTR4_WORD0_SIZE) {
303 READ_BUF(8);
304 len += 8;
305 p = xdr_decode_hyper(p, &iattr->ia_size);
306 iattr->ia_valid |= ATTR_SIZE;
307 }
308 if (bmval[0] & FATTR4_WORD0_ACL) {
309 u32 nace;
310 struct nfs4_ace *ace;
311
312 READ_BUF(4); len += 4;
313 nace = be32_to_cpup(p++);
314
315 if (nace > NFS4_ACL_MAX)
316 return nfserr_fbig;
317
318 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
319 if (*acl == NULL)
320 return nfserr_jukebox;
321
322 (*acl)->naces = nace;
323 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
324 READ_BUF(16); len += 16;
325 ace->type = be32_to_cpup(p++);
326 ace->flag = be32_to_cpup(p++);
327 ace->access_mask = be32_to_cpup(p++);
328 dummy32 = be32_to_cpup(p++);
329 READ_BUF(dummy32);
330 len += XDR_QUADLEN(dummy32) << 2;
331 READMEM(buf, dummy32);
332 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
333 status = nfs_ok;
334 if (ace->whotype != NFS4_ACL_WHO_NAMED)
335 ;
336 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
337 status = nfsd_map_name_to_gid(argp->rqstp,
338 buf, dummy32, &ace->who_gid);
339 else
340 status = nfsd_map_name_to_uid(argp->rqstp,
341 buf, dummy32, &ace->who_uid);
342 if (status)
343 return status;
344 }
345 } else
346 *acl = NULL;
347 if (bmval[1] & FATTR4_WORD1_MODE) {
348 READ_BUF(4);
349 len += 4;
350 iattr->ia_mode = be32_to_cpup(p++);
351 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
352 iattr->ia_valid |= ATTR_MODE;
353 }
354 if (bmval[1] & FATTR4_WORD1_OWNER) {
355 READ_BUF(4);
356 len += 4;
357 dummy32 = be32_to_cpup(p++);
358 READ_BUF(dummy32);
359 len += (XDR_QUADLEN(dummy32) << 2);
360 READMEM(buf, dummy32);
361 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
362 return status;
363 iattr->ia_valid |= ATTR_UID;
364 }
365 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
366 READ_BUF(4);
367 len += 4;
368 dummy32 = be32_to_cpup(p++);
369 READ_BUF(dummy32);
370 len += (XDR_QUADLEN(dummy32) << 2);
371 READMEM(buf, dummy32);
372 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
373 return status;
374 iattr->ia_valid |= ATTR_GID;
375 }
376 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
377 READ_BUF(4);
378 len += 4;
379 dummy32 = be32_to_cpup(p++);
380 switch (dummy32) {
381 case NFS4_SET_TO_CLIENT_TIME:
382 len += 12;
383 status = nfsd4_decode_time(argp, &iattr->ia_atime);
384 if (status)
385 return status;
386 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
387 break;
388 case NFS4_SET_TO_SERVER_TIME:
389 iattr->ia_valid |= ATTR_ATIME;
390 break;
391 default:
392 goto xdr_error;
393 }
394 }
395 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
396 READ_BUF(4);
397 len += 4;
398 dummy32 = be32_to_cpup(p++);
399 switch (dummy32) {
400 case NFS4_SET_TO_CLIENT_TIME:
401 len += 12;
402 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
403 if (status)
404 return status;
405 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
406 break;
407 case NFS4_SET_TO_SERVER_TIME:
408 iattr->ia_valid |= ATTR_MTIME;
409 break;
410 default:
411 goto xdr_error;
412 }
413 }
414
415 label->len = 0;
416#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
417 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
418 READ_BUF(4);
419 len += 4;
420 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
421 READ_BUF(4);
422 len += 4;
423 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
424 READ_BUF(4);
425 len += 4;
426 dummy32 = be32_to_cpup(p++);
427 READ_BUF(dummy32);
428 if (dummy32 > NFS4_MAXLABELLEN)
429 return nfserr_badlabel;
430 len += (XDR_QUADLEN(dummy32) << 2);
431 READMEM(buf, dummy32);
432 label->len = dummy32;
433 label->data = svcxdr_dupstr(argp, buf, dummy32);
434 if (!label->data)
435 return nfserr_jukebox;
436 }
437#endif
438
439 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
440 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
441 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
442 READ_BUF(expected_len - len);
443 else if (len != expected_len)
444 goto xdr_error;
445
446 DECODE_TAIL;
447}
448
449static __be32
450nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
451{
452 DECODE_HEAD;
453
454 READ_BUF(sizeof(stateid_t));
455 sid->si_generation = be32_to_cpup(p++);
456 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
457
458 DECODE_TAIL;
459}
460
461static __be32
462nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
463{
464 DECODE_HEAD;
465
466 READ_BUF(4);
467 access->ac_req_access = be32_to_cpup(p++);
468
469 DECODE_TAIL;
470}
471
472static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
473{
474 DECODE_HEAD;
475 u32 dummy, uid, gid;
476 char *machine_name;
477 int i;
478 int nr_secflavs;
479
480 /* callback_sec_params4 */
481 READ_BUF(4);
482 nr_secflavs = be32_to_cpup(p++);
483 if (nr_secflavs)
484 cbs->flavor = (u32)(-1);
485 else
486 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
487 cbs->flavor = 0;
488 for (i = 0; i < nr_secflavs; ++i) {
489 READ_BUF(4);
490 dummy = be32_to_cpup(p++);
491 switch (dummy) {
492 case RPC_AUTH_NULL:
493 /* Nothing to read */
494 if (cbs->flavor == (u32)(-1))
495 cbs->flavor = RPC_AUTH_NULL;
496 break;
497 case RPC_AUTH_UNIX:
498 READ_BUF(8);
499 /* stamp */
500 dummy = be32_to_cpup(p++);
501
502 /* machine name */
503 dummy = be32_to_cpup(p++);
504 READ_BUF(dummy);
505 SAVEMEM(machine_name, dummy);
506
507 /* uid, gid */
508 READ_BUF(8);
509 uid = be32_to_cpup(p++);
510 gid = be32_to_cpup(p++);
511
512 /* more gids */
513 READ_BUF(4);
514 dummy = be32_to_cpup(p++);
515 READ_BUF(dummy * 4);
516 if (cbs->flavor == (u32)(-1)) {
517 kuid_t kuid = make_kuid(&init_user_ns, uid);
518 kgid_t kgid = make_kgid(&init_user_ns, gid);
519 if (uid_valid(kuid) && gid_valid(kgid)) {
520 cbs->uid = kuid;
521 cbs->gid = kgid;
522 cbs->flavor = RPC_AUTH_UNIX;
523 } else {
524 dprintk("RPC_AUTH_UNIX with invalid"
525 "uid or gid ignoring!\n");
526 }
527 }
528 break;
529 case RPC_AUTH_GSS:
530 dprintk("RPC_AUTH_GSS callback secflavor "
531 "not supported!\n");
532 READ_BUF(8);
533 /* gcbp_service */
534 dummy = be32_to_cpup(p++);
535 /* gcbp_handle_from_server */
536 dummy = be32_to_cpup(p++);
537 READ_BUF(dummy);
538 p += XDR_QUADLEN(dummy);
539 /* gcbp_handle_from_client */
540 READ_BUF(4);
541 dummy = be32_to_cpup(p++);
542 READ_BUF(dummy);
543 break;
544 default:
545 dprintk("Illegal callback secflavor\n");
546 return nfserr_inval;
547 }
548 }
549 DECODE_TAIL;
550}
551
552static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
553{
554 DECODE_HEAD;
555
556 READ_BUF(4);
557 bc->bc_cb_program = be32_to_cpup(p++);
558 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
559
560 DECODE_TAIL;
561}
562
563static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
564{
565 DECODE_HEAD;
566
567 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
568 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
569 bcts->dir = be32_to_cpup(p++);
570 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
571 * could help us figure out we should be using it. */
572 DECODE_TAIL;
573}
574
575static __be32
576nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
577{
578 DECODE_HEAD;
579
580 READ_BUF(4);
581 close->cl_seqid = be32_to_cpup(p++);
582 return nfsd4_decode_stateid(argp, &close->cl_stateid);
583
584 DECODE_TAIL;
585}
586
587
588static __be32
589nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
590{
591 DECODE_HEAD;
592
593 READ_BUF(12);
594 p = xdr_decode_hyper(p, &commit->co_offset);
595 commit->co_count = be32_to_cpup(p++);
596
597 DECODE_TAIL;
598}
599
600static __be32
601nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
602{
603 DECODE_HEAD;
604
605 READ_BUF(4);
606 create->cr_type = be32_to_cpup(p++);
607 switch (create->cr_type) {
608 case NF4LNK:
609 READ_BUF(4);
610 create->cr_datalen = be32_to_cpup(p++);
611 READ_BUF(create->cr_datalen);
612 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
613 if (!create->cr_data)
614 return nfserr_jukebox;
615 break;
616 case NF4BLK:
617 case NF4CHR:
618 READ_BUF(8);
619 create->cr_specdata1 = be32_to_cpup(p++);
620 create->cr_specdata2 = be32_to_cpup(p++);
621 break;
622 case NF4SOCK:
623 case NF4FIFO:
624 case NF4DIR:
625 default:
626 break;
627 }
628
629 READ_BUF(4);
630 create->cr_namelen = be32_to_cpup(p++);
631 READ_BUF(create->cr_namelen);
632 SAVEMEM(create->cr_name, create->cr_namelen);
633 if ((status = check_filename(create->cr_name, create->cr_namelen)))
634 return status;
635
636 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
637 &create->cr_acl, &create->cr_label);
638 if (status)
639 goto out;
640
641 DECODE_TAIL;
642}
643
644static inline __be32
645nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
646{
647 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
648}
649
650static inline __be32
651nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
652{
653 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
654}
655
656static __be32
657nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
658{
659 DECODE_HEAD;
660
661 READ_BUF(4);
662 link->li_namelen = be32_to_cpup(p++);
663 READ_BUF(link->li_namelen);
664 SAVEMEM(link->li_name, link->li_namelen);
665 if ((status = check_filename(link->li_name, link->li_namelen)))
666 return status;
667
668 DECODE_TAIL;
669}
670
671static __be32
672nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
673{
674 DECODE_HEAD;
675
676 /*
677 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
678 */
679 READ_BUF(28);
680 lock->lk_type = be32_to_cpup(p++);
681 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
682 goto xdr_error;
683 lock->lk_reclaim = be32_to_cpup(p++);
684 p = xdr_decode_hyper(p, &lock->lk_offset);
685 p = xdr_decode_hyper(p, &lock->lk_length);
686 lock->lk_is_new = be32_to_cpup(p++);
687
688 if (lock->lk_is_new) {
689 READ_BUF(4);
690 lock->lk_new_open_seqid = be32_to_cpup(p++);
691 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
692 if (status)
693 return status;
694 READ_BUF(8 + sizeof(clientid_t));
695 lock->lk_new_lock_seqid = be32_to_cpup(p++);
696 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
697 lock->lk_new_owner.len = be32_to_cpup(p++);
698 READ_BUF(lock->lk_new_owner.len);
699 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
700 } else {
701 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
702 if (status)
703 return status;
704 READ_BUF(4);
705 lock->lk_old_lock_seqid = be32_to_cpup(p++);
706 }
707
708 DECODE_TAIL;
709}
710
711static __be32
712nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
713{
714 DECODE_HEAD;
715
716 READ_BUF(32);
717 lockt->lt_type = be32_to_cpup(p++);
718 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
719 goto xdr_error;
720 p = xdr_decode_hyper(p, &lockt->lt_offset);
721 p = xdr_decode_hyper(p, &lockt->lt_length);
722 COPYMEM(&lockt->lt_clientid, 8);
723 lockt->lt_owner.len = be32_to_cpup(p++);
724 READ_BUF(lockt->lt_owner.len);
725 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
726
727 DECODE_TAIL;
728}
729
730static __be32
731nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
732{
733 DECODE_HEAD;
734
735 READ_BUF(8);
736 locku->lu_type = be32_to_cpup(p++);
737 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
738 goto xdr_error;
739 locku->lu_seqid = be32_to_cpup(p++);
740 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
741 if (status)
742 return status;
743 READ_BUF(16);
744 p = xdr_decode_hyper(p, &locku->lu_offset);
745 p = xdr_decode_hyper(p, &locku->lu_length);
746
747 DECODE_TAIL;
748}
749
750static __be32
751nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
752{
753 DECODE_HEAD;
754
755 READ_BUF(4);
756 lookup->lo_len = be32_to_cpup(p++);
757 READ_BUF(lookup->lo_len);
758 SAVEMEM(lookup->lo_name, lookup->lo_len);
759 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
760 return status;
761
762 DECODE_TAIL;
763}
764
765static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
766{
767 __be32 *p;
768 u32 w;
769
770 READ_BUF(4);
771 w = be32_to_cpup(p++);
772 *share_access = w & NFS4_SHARE_ACCESS_MASK;
773 *deleg_want = w & NFS4_SHARE_WANT_MASK;
774 if (deleg_when)
775 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
776
777 switch (w & NFS4_SHARE_ACCESS_MASK) {
778 case NFS4_SHARE_ACCESS_READ:
779 case NFS4_SHARE_ACCESS_WRITE:
780 case NFS4_SHARE_ACCESS_BOTH:
781 break;
782 default:
783 return nfserr_bad_xdr;
784 }
785 w &= ~NFS4_SHARE_ACCESS_MASK;
786 if (!w)
787 return nfs_ok;
788 if (!argp->minorversion)
789 return nfserr_bad_xdr;
790 switch (w & NFS4_SHARE_WANT_MASK) {
791 case NFS4_SHARE_WANT_NO_PREFERENCE:
792 case NFS4_SHARE_WANT_READ_DELEG:
793 case NFS4_SHARE_WANT_WRITE_DELEG:
794 case NFS4_SHARE_WANT_ANY_DELEG:
795 case NFS4_SHARE_WANT_NO_DELEG:
796 case NFS4_SHARE_WANT_CANCEL:
797 break;
798 default:
799 return nfserr_bad_xdr;
800 }
801 w &= ~NFS4_SHARE_WANT_MASK;
802 if (!w)
803 return nfs_ok;
804
805 if (!deleg_when) /* open_downgrade */
806 return nfserr_inval;
807 switch (w) {
808 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
809 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
810 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
811 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
812 return nfs_ok;
813 }
814xdr_error:
815 return nfserr_bad_xdr;
816}
817
818static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
819{
820 __be32 *p;
821
822 READ_BUF(4);
823 *x = be32_to_cpup(p++);
824 /* Note: unlinke access bits, deny bits may be zero. */
825 if (*x & ~NFS4_SHARE_DENY_BOTH)
826 return nfserr_bad_xdr;
827 return nfs_ok;
828xdr_error:
829 return nfserr_bad_xdr;
830}
831
832static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
833{
834 __be32 *p;
835
836 READ_BUF(4);
837 o->len = be32_to_cpup(p++);
838
839 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
840 return nfserr_bad_xdr;
841
842 READ_BUF(o->len);
843 SAVEMEM(o->data, o->len);
844 return nfs_ok;
845xdr_error:
846 return nfserr_bad_xdr;
847}
848
849static __be32
850nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
851{
852 DECODE_HEAD;
853 u32 dummy;
854
855 memset(open->op_bmval, 0, sizeof(open->op_bmval));
856 open->op_iattr.ia_valid = 0;
857 open->op_openowner = NULL;
858
859 open->op_xdr_error = 0;
860 /* seqid, share_access, share_deny, clientid, ownerlen */
861 READ_BUF(4);
862 open->op_seqid = be32_to_cpup(p++);
863 /* decode, yet ignore deleg_when until supported */
864 status = nfsd4_decode_share_access(argp, &open->op_share_access,
865 &open->op_deleg_want, &dummy);
866 if (status)
867 goto xdr_error;
868 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
869 if (status)
870 goto xdr_error;
871 READ_BUF(sizeof(clientid_t));
872 COPYMEM(&open->op_clientid, sizeof(clientid_t));
873 status = nfsd4_decode_opaque(argp, &open->op_owner);
874 if (status)
875 goto xdr_error;
876 READ_BUF(4);
877 open->op_create = be32_to_cpup(p++);
878 switch (open->op_create) {
879 case NFS4_OPEN_NOCREATE:
880 break;
881 case NFS4_OPEN_CREATE:
882 READ_BUF(4);
883 open->op_createmode = be32_to_cpup(p++);
884 switch (open->op_createmode) {
885 case NFS4_CREATE_UNCHECKED:
886 case NFS4_CREATE_GUARDED:
887 status = nfsd4_decode_fattr(argp, open->op_bmval,
888 &open->op_iattr, &open->op_acl, &open->op_label);
889 if (status)
890 goto out;
891 break;
892 case NFS4_CREATE_EXCLUSIVE:
893 READ_BUF(NFS4_VERIFIER_SIZE);
894 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
895 break;
896 case NFS4_CREATE_EXCLUSIVE4_1:
897 if (argp->minorversion < 1)
898 goto xdr_error;
899 READ_BUF(NFS4_VERIFIER_SIZE);
900 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
901 status = nfsd4_decode_fattr(argp, open->op_bmval,
902 &open->op_iattr, &open->op_acl, &open->op_label);
903 if (status)
904 goto out;
905 break;
906 default:
907 goto xdr_error;
908 }
909 break;
910 default:
911 goto xdr_error;
912 }
913
914 /* open_claim */
915 READ_BUF(4);
916 open->op_claim_type = be32_to_cpup(p++);
917 switch (open->op_claim_type) {
918 case NFS4_OPEN_CLAIM_NULL:
919 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
920 READ_BUF(4);
921 open->op_fname.len = be32_to_cpup(p++);
922 READ_BUF(open->op_fname.len);
923 SAVEMEM(open->op_fname.data, open->op_fname.len);
924 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
925 return status;
926 break;
927 case NFS4_OPEN_CLAIM_PREVIOUS:
928 READ_BUF(4);
929 open->op_delegate_type = be32_to_cpup(p++);
930 break;
931 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
932 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
933 if (status)
934 return status;
935 READ_BUF(4);
936 open->op_fname.len = be32_to_cpup(p++);
937 READ_BUF(open->op_fname.len);
938 SAVEMEM(open->op_fname.data, open->op_fname.len);
939 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
940 return status;
941 break;
942 case NFS4_OPEN_CLAIM_FH:
943 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
944 if (argp->minorversion < 1)
945 goto xdr_error;
946 /* void */
947 break;
948 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
949 if (argp->minorversion < 1)
950 goto xdr_error;
951 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
952 if (status)
953 return status;
954 break;
955 default:
956 goto xdr_error;
957 }
958
959 DECODE_TAIL;
960}
961
962static __be32
963nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
964{
965 DECODE_HEAD;
966
967 if (argp->minorversion >= 1)
968 return nfserr_notsupp;
969
970 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
971 if (status)
972 return status;
973 READ_BUF(4);
974 open_conf->oc_seqid = be32_to_cpup(p++);
975
976 DECODE_TAIL;
977}
978
979static __be32
980nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
981{
982 DECODE_HEAD;
983
984 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
985 if (status)
986 return status;
987 READ_BUF(4);
988 open_down->od_seqid = be32_to_cpup(p++);
989 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
990 &open_down->od_deleg_want, NULL);
991 if (status)
992 return status;
993 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
994 if (status)
995 return status;
996 DECODE_TAIL;
997}
998
999static __be32
1000nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1001{
1002 DECODE_HEAD;
1003
1004 READ_BUF(4);
1005 putfh->pf_fhlen = be32_to_cpup(p++);
1006 if (putfh->pf_fhlen > NFS4_FHSIZE)
1007 goto xdr_error;
1008 READ_BUF(putfh->pf_fhlen);
1009 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1010
1011 DECODE_TAIL;
1012}
1013
1014static __be32
1015nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016{
1017 if (argp->minorversion == 0)
1018 return nfs_ok;
1019 return nfserr_notsupp;
1020}
1021
1022static __be32
1023nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1024{
1025 DECODE_HEAD;
1026
1027 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1028 if (status)
1029 return status;
1030 READ_BUF(12);
1031 p = xdr_decode_hyper(p, &read->rd_offset);
1032 read->rd_length = be32_to_cpup(p++);
1033
1034 DECODE_TAIL;
1035}
1036
1037static __be32
1038nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1039{
1040 DECODE_HEAD;
1041
1042 READ_BUF(24);
1043 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1044 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1045 readdir->rd_dircount = be32_to_cpup(p++);
1046 readdir->rd_maxcount = be32_to_cpup(p++);
1047 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1048 goto out;
1049
1050 DECODE_TAIL;
1051}
1052
1053static __be32
1054nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1055{
1056 DECODE_HEAD;
1057
1058 READ_BUF(4);
1059 remove->rm_namelen = be32_to_cpup(p++);
1060 READ_BUF(remove->rm_namelen);
1061 SAVEMEM(remove->rm_name, remove->rm_namelen);
1062 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1063 return status;
1064
1065 DECODE_TAIL;
1066}
1067
1068static __be32
1069nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1070{
1071 DECODE_HEAD;
1072
1073 READ_BUF(4);
1074 rename->rn_snamelen = be32_to_cpup(p++);
1075 READ_BUF(rename->rn_snamelen);
1076 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1077 READ_BUF(4);
1078 rename->rn_tnamelen = be32_to_cpup(p++);
1079 READ_BUF(rename->rn_tnamelen);
1080 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1081 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1082 return status;
1083 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1084 return status;
1085
1086 DECODE_TAIL;
1087}
1088
1089static __be32
1090nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1091{
1092 DECODE_HEAD;
1093
1094 if (argp->minorversion >= 1)
1095 return nfserr_notsupp;
1096
1097 READ_BUF(sizeof(clientid_t));
1098 COPYMEM(clientid, sizeof(clientid_t));
1099
1100 DECODE_TAIL;
1101}
1102
1103static __be32
1104nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1105 struct nfsd4_secinfo *secinfo)
1106{
1107 DECODE_HEAD;
1108
1109 READ_BUF(4);
1110 secinfo->si_namelen = be32_to_cpup(p++);
1111 READ_BUF(secinfo->si_namelen);
1112 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1113 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1114 if (status)
1115 return status;
1116 DECODE_TAIL;
1117}
1118
1119static __be32
1120nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1121 struct nfsd4_secinfo_no_name *sin)
1122{
1123 DECODE_HEAD;
1124
1125 READ_BUF(4);
1126 sin->sin_style = be32_to_cpup(p++);
1127 DECODE_TAIL;
1128}
1129
1130static __be32
1131nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1132{
1133 __be32 status;
1134
1135 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1136 if (status)
1137 return status;
1138 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1139 &setattr->sa_acl, &setattr->sa_label);
1140}
1141
1142static __be32
1143nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1144{
1145 DECODE_HEAD;
1146
1147 if (argp->minorversion >= 1)
1148 return nfserr_notsupp;
1149
1150 READ_BUF(NFS4_VERIFIER_SIZE);
1151 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1152
1153 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1154 if (status)
1155 return nfserr_bad_xdr;
1156 READ_BUF(8);
1157 setclientid->se_callback_prog = be32_to_cpup(p++);
1158 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1159 READ_BUF(setclientid->se_callback_netid_len);
1160 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1161 READ_BUF(4);
1162 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1163
1164 READ_BUF(setclientid->se_callback_addr_len);
1165 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1166 READ_BUF(4);
1167 setclientid->se_callback_ident = be32_to_cpup(p++);
1168
1169 DECODE_TAIL;
1170}
1171
1172static __be32
1173nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1174{
1175 DECODE_HEAD;
1176
1177 if (argp->minorversion >= 1)
1178 return nfserr_notsupp;
1179
1180 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1181 COPYMEM(&scd_c->sc_clientid, 8);
1182 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1183
1184 DECODE_TAIL;
1185}
1186
1187/* Also used for NVERIFY */
1188static __be32
1189nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1190{
1191 DECODE_HEAD;
1192
1193 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1194 goto out;
1195
1196 /* For convenience's sake, we compare raw xdr'd attributes in
1197 * nfsd4_proc_verify */
1198
1199 READ_BUF(4);
1200 verify->ve_attrlen = be32_to_cpup(p++);
1201 READ_BUF(verify->ve_attrlen);
1202 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1203
1204 DECODE_TAIL;
1205}
1206
1207static __be32
1208nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1209{
1210 int avail;
1211 int len;
1212 DECODE_HEAD;
1213
1214 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1215 if (status)
1216 return status;
1217 READ_BUF(16);
1218 p = xdr_decode_hyper(p, &write->wr_offset);
1219 write->wr_stable_how = be32_to_cpup(p++);
1220 if (write->wr_stable_how > 2)
1221 goto xdr_error;
1222 write->wr_buflen = be32_to_cpup(p++);
1223
1224 /* Sorry .. no magic macros for this.. *
1225 * READ_BUF(write->wr_buflen);
1226 * SAVEMEM(write->wr_buf, write->wr_buflen);
1227 */
1228 avail = (char*)argp->end - (char*)argp->p;
1229 if (avail + argp->pagelen < write->wr_buflen) {
1230 dprintk("NFSD: xdr error (%s:%d)\n",
1231 __FILE__, __LINE__);
1232 goto xdr_error;
1233 }
1234 write->wr_head.iov_base = p;
1235 write->wr_head.iov_len = avail;
1236 write->wr_pagelist = argp->pagelist;
1237
1238 len = XDR_QUADLEN(write->wr_buflen) << 2;
1239 if (len >= avail) {
1240 int pages;
1241
1242 len -= avail;
1243
1244 pages = len >> PAGE_SHIFT;
1245 argp->pagelist += pages;
1246 argp->pagelen -= pages * PAGE_SIZE;
1247 len -= pages * PAGE_SIZE;
1248
1249 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1250 argp->pagelist++;
1251 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1252 }
1253 argp->p += XDR_QUADLEN(len);
1254
1255 DECODE_TAIL;
1256}
1257
1258static __be32
1259nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1260{
1261 DECODE_HEAD;
1262
1263 if (argp->minorversion >= 1)
1264 return nfserr_notsupp;
1265
1266 READ_BUF(12);
1267 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1268 rlockowner->rl_owner.len = be32_to_cpup(p++);
1269 READ_BUF(rlockowner->rl_owner.len);
1270 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1271
1272 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1273 return nfserr_inval;
1274 DECODE_TAIL;
1275}
1276
1277static __be32
1278nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1279 struct nfsd4_exchange_id *exid)
1280{
1281 int dummy, tmp;
1282 DECODE_HEAD;
1283
1284 READ_BUF(NFS4_VERIFIER_SIZE);
1285 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1286
1287 status = nfsd4_decode_opaque(argp, &exid->clname);
1288 if (status)
1289 return nfserr_bad_xdr;
1290
1291 READ_BUF(4);
1292 exid->flags = be32_to_cpup(p++);
1293
1294 /* Ignore state_protect4_a */
1295 READ_BUF(4);
1296 exid->spa_how = be32_to_cpup(p++);
1297 switch (exid->spa_how) {
1298 case SP4_NONE:
1299 break;
1300 case SP4_MACH_CRED:
1301 /* spo_must_enforce */
1302 READ_BUF(4);
1303 dummy = be32_to_cpup(p++);
1304 READ_BUF(dummy * 4);
1305 p += dummy;
1306
1307 /* spo_must_allow */
1308 READ_BUF(4);
1309 dummy = be32_to_cpup(p++);
1310 READ_BUF(dummy * 4);
1311 p += dummy;
1312 break;
1313 case SP4_SSV:
1314 /* ssp_ops */
1315 READ_BUF(4);
1316 dummy = be32_to_cpup(p++);
1317 READ_BUF(dummy * 4);
1318 p += dummy;
1319
1320 READ_BUF(4);
1321 dummy = be32_to_cpup(p++);
1322 READ_BUF(dummy * 4);
1323 p += dummy;
1324
1325 /* ssp_hash_algs<> */
1326 READ_BUF(4);
1327 tmp = be32_to_cpup(p++);
1328 while (tmp--) {
1329 READ_BUF(4);
1330 dummy = be32_to_cpup(p++);
1331 READ_BUF(dummy);
1332 p += XDR_QUADLEN(dummy);
1333 }
1334
1335 /* ssp_encr_algs<> */
1336 READ_BUF(4);
1337 tmp = be32_to_cpup(p++);
1338 while (tmp--) {
1339 READ_BUF(4);
1340 dummy = be32_to_cpup(p++);
1341 READ_BUF(dummy);
1342 p += XDR_QUADLEN(dummy);
1343 }
1344
1345 /* ssp_window and ssp_num_gss_handles */
1346 READ_BUF(8);
1347 dummy = be32_to_cpup(p++);
1348 dummy = be32_to_cpup(p++);
1349 break;
1350 default:
1351 goto xdr_error;
1352 }
1353
1354 /* Ignore Implementation ID */
1355 READ_BUF(4); /* nfs_impl_id4 array length */
1356 dummy = be32_to_cpup(p++);
1357
1358 if (dummy > 1)
1359 goto xdr_error;
1360
1361 if (dummy == 1) {
1362 /* nii_domain */
1363 READ_BUF(4);
1364 dummy = be32_to_cpup(p++);
1365 READ_BUF(dummy);
1366 p += XDR_QUADLEN(dummy);
1367
1368 /* nii_name */
1369 READ_BUF(4);
1370 dummy = be32_to_cpup(p++);
1371 READ_BUF(dummy);
1372 p += XDR_QUADLEN(dummy);
1373
1374 /* nii_date */
1375 READ_BUF(12);
1376 p += 3;
1377 }
1378 DECODE_TAIL;
1379}
1380
1381static __be32
1382nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1383 struct nfsd4_create_session *sess)
1384{
1385 DECODE_HEAD;
1386 u32 dummy;
1387
1388 READ_BUF(16);
1389 COPYMEM(&sess->clientid, 8);
1390 sess->seqid = be32_to_cpup(p++);
1391 sess->flags = be32_to_cpup(p++);
1392
1393 /* Fore channel attrs */
1394 READ_BUF(28);
1395 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1396 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1397 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1398 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1399 sess->fore_channel.maxops = be32_to_cpup(p++);
1400 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1401 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1402 if (sess->fore_channel.nr_rdma_attrs == 1) {
1403 READ_BUF(4);
1404 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1405 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1406 dprintk("Too many fore channel attr bitmaps!\n");
1407 goto xdr_error;
1408 }
1409
1410 /* Back channel attrs */
1411 READ_BUF(28);
1412 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1413 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1414 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1415 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1416 sess->back_channel.maxops = be32_to_cpup(p++);
1417 sess->back_channel.maxreqs = be32_to_cpup(p++);
1418 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1419 if (sess->back_channel.nr_rdma_attrs == 1) {
1420 READ_BUF(4);
1421 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1422 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1423 dprintk("Too many back channel attr bitmaps!\n");
1424 goto xdr_error;
1425 }
1426
1427 READ_BUF(4);
1428 sess->callback_prog = be32_to_cpup(p++);
1429 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1430 DECODE_TAIL;
1431}
1432
1433static __be32
1434nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1435 struct nfsd4_destroy_session *destroy_session)
1436{
1437 DECODE_HEAD;
1438 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1439 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1440
1441 DECODE_TAIL;
1442}
1443
1444static __be32
1445nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1446 struct nfsd4_free_stateid *free_stateid)
1447{
1448 DECODE_HEAD;
1449
1450 READ_BUF(sizeof(stateid_t));
1451 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1452 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1453
1454 DECODE_TAIL;
1455}
1456
1457static __be32
1458nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1459 struct nfsd4_sequence *seq)
1460{
1461 DECODE_HEAD;
1462
1463 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1464 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1465 seq->seqid = be32_to_cpup(p++);
1466 seq->slotid = be32_to_cpup(p++);
1467 seq->maxslots = be32_to_cpup(p++);
1468 seq->cachethis = be32_to_cpup(p++);
1469
1470 DECODE_TAIL;
1471}
1472
1473static __be32
1474nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1475{
1476 int i;
1477 __be32 *p, status;
1478 struct nfsd4_test_stateid_id *stateid;
1479
1480 READ_BUF(4);
1481 test_stateid->ts_num_ids = ntohl(*p++);
1482
1483 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1484
1485 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1486 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1487 if (!stateid) {
1488 status = nfserrno(-ENOMEM);
1489 goto out;
1490 }
1491
1492 INIT_LIST_HEAD(&stateid->ts_id_list);
1493 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1494
1495 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1496 if (status)
1497 goto out;
1498 }
1499
1500 status = 0;
1501out:
1502 return status;
1503xdr_error:
1504 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1505 status = nfserr_bad_xdr;
1506 goto out;
1507}
1508
1509static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1510{
1511 DECODE_HEAD;
1512
1513 READ_BUF(8);
1514 COPYMEM(&dc->clientid, 8);
1515
1516 DECODE_TAIL;
1517}
1518
1519static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1520{
1521 DECODE_HEAD;
1522
1523 READ_BUF(4);
1524 rc->rca_one_fs = be32_to_cpup(p++);
1525
1526 DECODE_TAIL;
1527}
1528
1529#ifdef CONFIG_NFSD_PNFS
1530static __be32
1531nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1532 struct nfsd4_getdeviceinfo *gdev)
1533{
1534 DECODE_HEAD;
1535 u32 num, i;
1536
1537 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1538 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1539 gdev->gd_layout_type = be32_to_cpup(p++);
1540 gdev->gd_maxcount = be32_to_cpup(p++);
1541 num = be32_to_cpup(p++);
1542 if (num) {
1543 READ_BUF(4 * num);
1544 gdev->gd_notify_types = be32_to_cpup(p++);
1545 for (i = 1; i < num; i++) {
1546 if (be32_to_cpup(p++)) {
1547 status = nfserr_inval;
1548 goto out;
1549 }
1550 }
1551 }
1552 DECODE_TAIL;
1553}
1554
1555static __be32
1556nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1557 struct nfsd4_layoutget *lgp)
1558{
1559 DECODE_HEAD;
1560
1561 READ_BUF(36);
1562 lgp->lg_signal = be32_to_cpup(p++);
1563 lgp->lg_layout_type = be32_to_cpup(p++);
1564 lgp->lg_seg.iomode = be32_to_cpup(p++);
1565 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1566 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1567 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1568
1569 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1570 if (status)
1571 return status;
1572
1573 READ_BUF(4);
1574 lgp->lg_maxcount = be32_to_cpup(p++);
1575
1576 DECODE_TAIL;
1577}
1578
1579static __be32
1580nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1581 struct nfsd4_layoutcommit *lcp)
1582{
1583 DECODE_HEAD;
1584 u32 timechange;
1585
1586 READ_BUF(20);
1587 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1588 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1589 lcp->lc_reclaim = be32_to_cpup(p++);
1590
1591 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1592 if (status)
1593 return status;
1594
1595 READ_BUF(4);
1596 lcp->lc_newoffset = be32_to_cpup(p++);
1597 if (lcp->lc_newoffset) {
1598 READ_BUF(8);
1599 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1600 } else
1601 lcp->lc_last_wr = 0;
1602 READ_BUF(4);
1603 timechange = be32_to_cpup(p++);
1604 if (timechange) {
1605 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1606 if (status)
1607 return status;
1608 } else {
1609 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1610 }
1611 READ_BUF(8);
1612 lcp->lc_layout_type = be32_to_cpup(p++);
1613
1614 /*
1615 * Save the layout update in XDR format and let the layout driver deal
1616 * with it later.
1617 */
1618 lcp->lc_up_len = be32_to_cpup(p++);
1619 if (lcp->lc_up_len > 0) {
1620 READ_BUF(lcp->lc_up_len);
1621 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1622 }
1623
1624 DECODE_TAIL;
1625}
1626
1627static __be32
1628nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1629 struct nfsd4_layoutreturn *lrp)
1630{
1631 DECODE_HEAD;
1632
1633 READ_BUF(16);
1634 lrp->lr_reclaim = be32_to_cpup(p++);
1635 lrp->lr_layout_type = be32_to_cpup(p++);
1636 lrp->lr_seg.iomode = be32_to_cpup(p++);
1637 lrp->lr_return_type = be32_to_cpup(p++);
1638 if (lrp->lr_return_type == RETURN_FILE) {
1639 READ_BUF(16);
1640 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1641 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1642
1643 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1644 if (status)
1645 return status;
1646
1647 READ_BUF(4);
1648 lrp->lrf_body_len = be32_to_cpup(p++);
1649 if (lrp->lrf_body_len > 0) {
1650 READ_BUF(lrp->lrf_body_len);
1651 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1652 }
1653 } else {
1654 lrp->lr_seg.offset = 0;
1655 lrp->lr_seg.length = NFS4_MAX_UINT64;
1656 }
1657
1658 DECODE_TAIL;
1659}
1660#endif /* CONFIG_NFSD_PNFS */
1661
1662static __be32
1663nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1664 struct nfsd4_fallocate *fallocate)
1665{
1666 DECODE_HEAD;
1667
1668 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1669 if (status)
1670 return status;
1671
1672 READ_BUF(16);
1673 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1674 xdr_decode_hyper(p, &fallocate->falloc_length);
1675
1676 DECODE_TAIL;
1677}
1678
1679static __be32
1680nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1681{
1682 DECODE_HEAD;
1683
1684 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1685 if (status)
1686 return status;
1687 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1688 if (status)
1689 return status;
1690
1691 READ_BUF(8 + 8 + 8);
1692 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1693 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1694 p = xdr_decode_hyper(p, &clone->cl_count);
1695 DECODE_TAIL;
1696}
1697
1698static __be32
1699nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1700{
1701 DECODE_HEAD;
1702
1703 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1704 if (status)
1705 return status;
1706
1707 READ_BUF(8 + 4);
1708 p = xdr_decode_hyper(p, &seek->seek_offset);
1709 seek->seek_whence = be32_to_cpup(p);
1710
1711 DECODE_TAIL;
1712}
1713
1714static __be32
1715nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1716{
1717 return nfs_ok;
1718}
1719
1720static __be32
1721nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1722{
1723 return nfserr_notsupp;
1724}
1725
1726typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1727
1728static nfsd4_dec nfsd4_dec_ops[] = {
1729 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1730 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1731 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1732 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1733 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1734 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1735 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1736 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1737 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1738 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1739 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1740 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1741 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1742 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1743 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1744 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1745 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1746 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1747 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1748 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1749 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1750 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1751 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1752 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1753 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1754 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1755 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1756 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1757 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1758 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1759 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1760 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1761 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1762 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1763 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1764 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1765 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1766
1767 /* new operations for NFSv4.1 */
1768 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1769 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1770 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1771 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1772 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1773 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1774 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1775#ifdef CONFIG_NFSD_PNFS
1776 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1777 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1778 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1779 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1780 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1781#else
1782 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1783 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1784 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1785 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1786 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1787#endif
1788 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1789 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1790 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1791 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1792 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1793 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1794 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1795
1796 /* new operations for NFSv4.2 */
1797 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1798 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1799 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1800 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1801 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1802 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1803 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1804 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1805 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1806 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1807 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1808 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1809 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1810};
1811
1812static inline bool
1813nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1814{
1815 if (op->opnum < FIRST_NFS4_OP)
1816 return false;
1817 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1818 return false;
1819 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1820 return false;
1821 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1822 return false;
1823 return true;
1824}
1825
1826static __be32
1827nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1828{
1829 DECODE_HEAD;
1830 struct nfsd4_op *op;
1831 bool cachethis = false;
1832 int auth_slack= argp->rqstp->rq_auth_slack;
1833 int max_reply = auth_slack + 8; /* opcnt, status */
1834 int readcount = 0;
1835 int readbytes = 0;
1836 int i;
1837
1838 READ_BUF(4);
1839 argp->taglen = be32_to_cpup(p++);
1840 READ_BUF(argp->taglen);
1841 SAVEMEM(argp->tag, argp->taglen);
1842 READ_BUF(8);
1843 argp->minorversion = be32_to_cpup(p++);
1844 argp->opcnt = be32_to_cpup(p++);
1845 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1846
1847 if (argp->taglen > NFSD4_MAX_TAGLEN)
1848 goto xdr_error;
1849 if (argp->opcnt > 100)
1850 goto xdr_error;
1851
1852 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1853 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1854 if (!argp->ops) {
1855 argp->ops = argp->iops;
1856 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1857 goto xdr_error;
1858 }
1859 }
1860
1861 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1862 argp->opcnt = 0;
1863
1864 for (i = 0; i < argp->opcnt; i++) {
1865 op = &argp->ops[i];
1866 op->replay = NULL;
1867
1868 READ_BUF(4);
1869 op->opnum = be32_to_cpup(p++);
1870
1871 if (nfsd4_opnum_in_range(argp, op))
1872 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1873 else {
1874 op->opnum = OP_ILLEGAL;
1875 op->status = nfserr_op_illegal;
1876 }
1877 /*
1878 * We'll try to cache the result in the DRC if any one
1879 * op in the compound wants to be cached:
1880 */
1881 cachethis |= nfsd4_cache_this_op(op);
1882
1883 if (op->opnum == OP_READ) {
1884 readcount++;
1885 readbytes += nfsd4_max_reply(argp->rqstp, op);
1886 } else
1887 max_reply += nfsd4_max_reply(argp->rqstp, op);
1888 /*
1889 * OP_LOCK may return a conflicting lock. (Special case
1890 * because it will just skip encoding this if it runs
1891 * out of xdr buffer space, and it is the only operation
1892 * that behaves this way.)
1893 */
1894 if (op->opnum == OP_LOCK)
1895 max_reply += NFS4_OPAQUE_LIMIT;
1896
1897 if (op->status) {
1898 argp->opcnt = i+1;
1899 break;
1900 }
1901 }
1902 /* Sessions make the DRC unnecessary: */
1903 if (argp->minorversion)
1904 cachethis = false;
1905 svc_reserve(argp->rqstp, max_reply + readbytes);
1906 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1907
1908 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1909 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1910
1911 DECODE_TAIL;
1912}
1913
1914static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1915{
1916 if (IS_I_VERSION(inode)) {
1917 p = xdr_encode_hyper(p, inode->i_version);
1918 } else {
1919 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1920 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1921 }
1922 return p;
1923}
1924
1925static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1926{
1927 *p++ = cpu_to_be32(c->atomic);
1928 if (c->change_supported) {
1929 p = xdr_encode_hyper(p, c->before_change);
1930 p = xdr_encode_hyper(p, c->after_change);
1931 } else {
1932 *p++ = cpu_to_be32(c->before_ctime_sec);
1933 *p++ = cpu_to_be32(c->before_ctime_nsec);
1934 *p++ = cpu_to_be32(c->after_ctime_sec);
1935 *p++ = cpu_to_be32(c->after_ctime_nsec);
1936 }
1937 return p;
1938}
1939
1940/* Encode as an array of strings the string given with components
1941 * separated @sep, escaped with esc_enter and esc_exit.
1942 */
1943static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1944 char *components, char esc_enter,
1945 char esc_exit)
1946{
1947 __be32 *p;
1948 __be32 pathlen;
1949 int pathlen_offset;
1950 int strlen, count=0;
1951 char *str, *end, *next;
1952
1953 dprintk("nfsd4_encode_components(%s)\n", components);
1954
1955 pathlen_offset = xdr->buf->len;
1956 p = xdr_reserve_space(xdr, 4);
1957 if (!p)
1958 return nfserr_resource;
1959 p++; /* We will fill this in with @count later */
1960
1961 end = str = components;
1962 while (*end) {
1963 bool found_esc = false;
1964
1965 /* try to parse as esc_start, ..., esc_end, sep */
1966 if (*str == esc_enter) {
1967 for (; *end && (*end != esc_exit); end++)
1968 /* find esc_exit or end of string */;
1969 next = end + 1;
1970 if (*end && (!*next || *next == sep)) {
1971 str++;
1972 found_esc = true;
1973 }
1974 }
1975
1976 if (!found_esc)
1977 for (; *end && (*end != sep); end++)
1978 /* find sep or end of string */;
1979
1980 strlen = end - str;
1981 if (strlen) {
1982 p = xdr_reserve_space(xdr, strlen + 4);
1983 if (!p)
1984 return nfserr_resource;
1985 p = xdr_encode_opaque(p, str, strlen);
1986 count++;
1987 }
1988 else
1989 end++;
1990 if (found_esc)
1991 end = next;
1992
1993 str = end;
1994 }
1995 pathlen = htonl(count);
1996 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1997 return 0;
1998}
1999
2000/* Encode as an array of strings the string given with components
2001 * separated @sep.
2002 */
2003static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2004 char *components)
2005{
2006 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2007}
2008
2009/*
2010 * encode a location element of a fs_locations structure
2011 */
2012static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2013 struct nfsd4_fs_location *location)
2014{
2015 __be32 status;
2016
2017 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2018 '[', ']');
2019 if (status)
2020 return status;
2021 status = nfsd4_encode_components(xdr, '/', location->path);
2022 if (status)
2023 return status;
2024 return 0;
2025}
2026
2027/*
2028 * Encode a path in RFC3530 'pathname4' format
2029 */
2030static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2031 const struct path *root,
2032 const struct path *path)
2033{
2034 struct path cur = *path;
2035 __be32 *p;
2036 struct dentry **components = NULL;
2037 unsigned int ncomponents = 0;
2038 __be32 err = nfserr_jukebox;
2039
2040 dprintk("nfsd4_encode_components(");
2041
2042 path_get(&cur);
2043 /* First walk the path up to the nfsd root, and store the
2044 * dentries/path components in an array.
2045 */
2046 for (;;) {
2047 if (path_equal(&cur, root))
2048 break;
2049 if (cur.dentry == cur.mnt->mnt_root) {
2050 if (follow_up(&cur))
2051 continue;
2052 goto out_free;
2053 }
2054 if ((ncomponents & 15) == 0) {
2055 struct dentry **new;
2056 new = krealloc(components,
2057 sizeof(*new) * (ncomponents + 16),
2058 GFP_KERNEL);
2059 if (!new)
2060 goto out_free;
2061 components = new;
2062 }
2063 components[ncomponents++] = cur.dentry;
2064 cur.dentry = dget_parent(cur.dentry);
2065 }
2066 err = nfserr_resource;
2067 p = xdr_reserve_space(xdr, 4);
2068 if (!p)
2069 goto out_free;
2070 *p++ = cpu_to_be32(ncomponents);
2071
2072 while (ncomponents) {
2073 struct dentry *dentry = components[ncomponents - 1];
2074 unsigned int len;
2075
2076 spin_lock(&dentry->d_lock);
2077 len = dentry->d_name.len;
2078 p = xdr_reserve_space(xdr, len + 4);
2079 if (!p) {
2080 spin_unlock(&dentry->d_lock);
2081 goto out_free;
2082 }
2083 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2084 dprintk("/%pd", dentry);
2085 spin_unlock(&dentry->d_lock);
2086 dput(dentry);
2087 ncomponents--;
2088 }
2089
2090 err = 0;
2091out_free:
2092 dprintk(")\n");
2093 while (ncomponents)
2094 dput(components[--ncomponents]);
2095 kfree(components);
2096 path_put(&cur);
2097 return err;
2098}
2099
2100static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2101 struct svc_rqst *rqstp, const struct path *path)
2102{
2103 struct svc_export *exp_ps;
2104 __be32 res;
2105
2106 exp_ps = rqst_find_fsidzero_export(rqstp);
2107 if (IS_ERR(exp_ps))
2108 return nfserrno(PTR_ERR(exp_ps));
2109 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2110 exp_put(exp_ps);
2111 return res;
2112}
2113
2114/*
2115 * encode a fs_locations structure
2116 */
2117static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2118 struct svc_rqst *rqstp, struct svc_export *exp)
2119{
2120 __be32 status;
2121 int i;
2122 __be32 *p;
2123 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2124
2125 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2126 if (status)
2127 return status;
2128 p = xdr_reserve_space(xdr, 4);
2129 if (!p)
2130 return nfserr_resource;
2131 *p++ = cpu_to_be32(fslocs->locations_count);
2132 for (i=0; i<fslocs->locations_count; i++) {
2133 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2134 if (status)
2135 return status;
2136 }
2137 return 0;
2138}
2139
2140static u32 nfs4_file_type(umode_t mode)
2141{
2142 switch (mode & S_IFMT) {
2143 case S_IFIFO: return NF4FIFO;
2144 case S_IFCHR: return NF4CHR;
2145 case S_IFDIR: return NF4DIR;
2146 case S_IFBLK: return NF4BLK;
2147 case S_IFLNK: return NF4LNK;
2148 case S_IFREG: return NF4REG;
2149 case S_IFSOCK: return NF4SOCK;
2150 default: return NF4BAD;
2151 };
2152}
2153
2154static inline __be32
2155nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2156 struct nfs4_ace *ace)
2157{
2158 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2159 return nfs4_acl_write_who(xdr, ace->whotype);
2160 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2161 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2162 else
2163 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2164}
2165
2166static inline __be32
2167nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2168{
2169 __be32 *p;
2170
2171 if (layout_type) {
2172 p = xdr_reserve_space(xdr, 8);
2173 if (!p)
2174 return nfserr_resource;
2175 *p++ = cpu_to_be32(1);
2176 *p++ = cpu_to_be32(layout_type);
2177 } else {
2178 p = xdr_reserve_space(xdr, 4);
2179 if (!p)
2180 return nfserr_resource;
2181 *p++ = cpu_to_be32(0);
2182 }
2183
2184 return 0;
2185}
2186
2187#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2188 FATTR4_WORD0_RDATTR_ERROR)
2189#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2190#define WORD2_ABSENT_FS_ATTRS 0
2191
2192#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2193static inline __be32
2194nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2195 void *context, int len)
2196{
2197 __be32 *p;
2198
2199 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2200 if (!p)
2201 return nfserr_resource;
2202
2203 /*
2204 * For now we use a 0 here to indicate the null translation; in
2205 * the future we may place a call to translation code here.
2206 */
2207 *p++ = cpu_to_be32(0); /* lfs */
2208 *p++ = cpu_to_be32(0); /* pi */
2209 p = xdr_encode_opaque(p, context, len);
2210 return 0;
2211}
2212#else
2213static inline __be32
2214nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2215 void *context, int len)
2216{ return 0; }
2217#endif
2218
2219static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2220{
2221 /* As per referral draft: */
2222 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2223 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2224 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2225 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2226 *rdattr_err = NFSERR_MOVED;
2227 else
2228 return nfserr_moved;
2229 }
2230 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2231 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2232 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2233 return 0;
2234}
2235
2236
2237static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2238{
2239 struct path path = exp->ex_path;
2240 int err;
2241
2242 path_get(&path);
2243 while (follow_up(&path)) {
2244 if (path.dentry != path.mnt->mnt_root)
2245 break;
2246 }
2247 err = vfs_getattr(&path, stat);
2248 path_put(&path);
2249 return err;
2250}
2251
2252static __be32
2253nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2254{
2255 __be32 *p;
2256
2257 if (bmval2) {
2258 p = xdr_reserve_space(xdr, 16);
2259 if (!p)
2260 goto out_resource;
2261 *p++ = cpu_to_be32(3);
2262 *p++ = cpu_to_be32(bmval0);
2263 *p++ = cpu_to_be32(bmval1);
2264 *p++ = cpu_to_be32(bmval2);
2265 } else if (bmval1) {
2266 p = xdr_reserve_space(xdr, 12);
2267 if (!p)
2268 goto out_resource;
2269 *p++ = cpu_to_be32(2);
2270 *p++ = cpu_to_be32(bmval0);
2271 *p++ = cpu_to_be32(bmval1);
2272 } else {
2273 p = xdr_reserve_space(xdr, 8);
2274 if (!p)
2275 goto out_resource;
2276 *p++ = cpu_to_be32(1);
2277 *p++ = cpu_to_be32(bmval0);
2278 }
2279
2280 return 0;
2281out_resource:
2282 return nfserr_resource;
2283}
2284
2285/*
2286 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2287 * ourselves.
2288 */
2289static __be32
2290nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2291 struct svc_export *exp,
2292 struct dentry *dentry, u32 *bmval,
2293 struct svc_rqst *rqstp, int ignore_crossmnt)
2294{
2295 u32 bmval0 = bmval[0];
2296 u32 bmval1 = bmval[1];
2297 u32 bmval2 = bmval[2];
2298 struct kstat stat;
2299 struct svc_fh *tempfh = NULL;
2300 struct kstatfs statfs;
2301 __be32 *p;
2302 int starting_len = xdr->buf->len;
2303 int attrlen_offset;
2304 __be32 attrlen;
2305 u32 dummy;
2306 u64 dummy64;
2307 u32 rdattr_err = 0;
2308 __be32 status;
2309 int err;
2310 struct nfs4_acl *acl = NULL;
2311 void *context = NULL;
2312 int contextlen;
2313 bool contextsupport = false;
2314 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2315 u32 minorversion = resp->cstate.minorversion;
2316 struct path path = {
2317 .mnt = exp->ex_path.mnt,
2318 .dentry = dentry,
2319 };
2320 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2321
2322 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2323 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2324 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2325 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2326
2327 if (exp->ex_fslocs.migrated) {
2328 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2329 if (status)
2330 goto out;
2331 }
2332
2333 err = vfs_getattr(&path, &stat);
2334 if (err)
2335 goto out_nfserr;
2336 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2337 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2338 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2339 FATTR4_WORD1_SPACE_TOTAL))) {
2340 err = vfs_statfs(&path, &statfs);
2341 if (err)
2342 goto out_nfserr;
2343 }
2344 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2345 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2346 status = nfserr_jukebox;
2347 if (!tempfh)
2348 goto out;
2349 fh_init(tempfh, NFS4_FHSIZE);
2350 status = fh_compose(tempfh, exp, dentry, NULL);
2351 if (status)
2352 goto out;
2353 fhp = tempfh;
2354 }
2355 if (bmval0 & FATTR4_WORD0_ACL) {
2356 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2357 if (err == -EOPNOTSUPP)
2358 bmval0 &= ~FATTR4_WORD0_ACL;
2359 else if (err == -EINVAL) {
2360 status = nfserr_attrnotsupp;
2361 goto out;
2362 } else if (err != 0)
2363 goto out_nfserr;
2364 }
2365
2366#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2367 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2368 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2369 err = security_inode_getsecctx(d_inode(dentry),
2370 &context, &contextlen);
2371 contextsupport = (err == 0);
2372 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2373 if (err == -EOPNOTSUPP)
2374 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2375 else if (err)
2376 goto out_nfserr;
2377 }
2378 }
2379#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2380
2381 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2382 if (status)
2383 goto out;
2384
2385 attrlen_offset = xdr->buf->len;
2386 p = xdr_reserve_space(xdr, 4);
2387 if (!p)
2388 goto out_resource;
2389 p++; /* to be backfilled later */
2390
2391 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2392 u32 word0 = nfsd_suppattrs0(minorversion);
2393 u32 word1 = nfsd_suppattrs1(minorversion);
2394 u32 word2 = nfsd_suppattrs2(minorversion);
2395
2396 if (!IS_POSIXACL(dentry->d_inode))
2397 word0 &= ~FATTR4_WORD0_ACL;
2398 if (!contextsupport)
2399 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2400 if (!word2) {
2401 p = xdr_reserve_space(xdr, 12);
2402 if (!p)
2403 goto out_resource;
2404 *p++ = cpu_to_be32(2);
2405 *p++ = cpu_to_be32(word0);
2406 *p++ = cpu_to_be32(word1);
2407 } else {
2408 p = xdr_reserve_space(xdr, 16);
2409 if (!p)
2410 goto out_resource;
2411 *p++ = cpu_to_be32(3);
2412 *p++ = cpu_to_be32(word0);
2413 *p++ = cpu_to_be32(word1);
2414 *p++ = cpu_to_be32(word2);
2415 }
2416 }
2417 if (bmval0 & FATTR4_WORD0_TYPE) {
2418 p = xdr_reserve_space(xdr, 4);
2419 if (!p)
2420 goto out_resource;
2421 dummy = nfs4_file_type(stat.mode);
2422 if (dummy == NF4BAD) {
2423 status = nfserr_serverfault;
2424 goto out;
2425 }
2426 *p++ = cpu_to_be32(dummy);
2427 }
2428 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2429 p = xdr_reserve_space(xdr, 4);
2430 if (!p)
2431 goto out_resource;
2432 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2433 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2434 else
2435 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2436 NFS4_FH_VOL_RENAME);
2437 }
2438 if (bmval0 & FATTR4_WORD0_CHANGE) {
2439 p = xdr_reserve_space(xdr, 8);
2440 if (!p)
2441 goto out_resource;
2442 p = encode_change(p, &stat, d_inode(dentry));
2443 }
2444 if (bmval0 & FATTR4_WORD0_SIZE) {
2445 p = xdr_reserve_space(xdr, 8);
2446 if (!p)
2447 goto out_resource;
2448 p = xdr_encode_hyper(p, stat.size);
2449 }
2450 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2451 p = xdr_reserve_space(xdr, 4);
2452 if (!p)
2453 goto out_resource;
2454 *p++ = cpu_to_be32(1);
2455 }
2456 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2457 p = xdr_reserve_space(xdr, 4);
2458 if (!p)
2459 goto out_resource;
2460 *p++ = cpu_to_be32(1);
2461 }
2462 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2463 p = xdr_reserve_space(xdr, 4);
2464 if (!p)
2465 goto out_resource;
2466 *p++ = cpu_to_be32(0);
2467 }
2468 if (bmval0 & FATTR4_WORD0_FSID) {
2469 p = xdr_reserve_space(xdr, 16);
2470 if (!p)
2471 goto out_resource;
2472 if (exp->ex_fslocs.migrated) {
2473 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2474 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2475 } else switch(fsid_source(fhp)) {
2476 case FSIDSOURCE_FSID:
2477 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2478 p = xdr_encode_hyper(p, (u64)0);
2479 break;
2480 case FSIDSOURCE_DEV:
2481 *p++ = cpu_to_be32(0);
2482 *p++ = cpu_to_be32(MAJOR(stat.dev));
2483 *p++ = cpu_to_be32(0);
2484 *p++ = cpu_to_be32(MINOR(stat.dev));
2485 break;
2486 case FSIDSOURCE_UUID:
2487 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2488 EX_UUID_LEN);
2489 break;
2490 }
2491 }
2492 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2493 p = xdr_reserve_space(xdr, 4);
2494 if (!p)
2495 goto out_resource;
2496 *p++ = cpu_to_be32(0);
2497 }
2498 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2499 p = xdr_reserve_space(xdr, 4);
2500 if (!p)
2501 goto out_resource;
2502 *p++ = cpu_to_be32(nn->nfsd4_lease);
2503 }
2504 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2505 p = xdr_reserve_space(xdr, 4);
2506 if (!p)
2507 goto out_resource;
2508 *p++ = cpu_to_be32(rdattr_err);
2509 }
2510 if (bmval0 & FATTR4_WORD0_ACL) {
2511 struct nfs4_ace *ace;
2512
2513 if (acl == NULL) {
2514 p = xdr_reserve_space(xdr, 4);
2515 if (!p)
2516 goto out_resource;
2517
2518 *p++ = cpu_to_be32(0);
2519 goto out_acl;
2520 }
2521 p = xdr_reserve_space(xdr, 4);
2522 if (!p)
2523 goto out_resource;
2524 *p++ = cpu_to_be32(acl->naces);
2525
2526 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2527 p = xdr_reserve_space(xdr, 4*3);
2528 if (!p)
2529 goto out_resource;
2530 *p++ = cpu_to_be32(ace->type);
2531 *p++ = cpu_to_be32(ace->flag);
2532 *p++ = cpu_to_be32(ace->access_mask &
2533 NFS4_ACE_MASK_ALL);
2534 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2535 if (status)
2536 goto out;
2537 }
2538 }
2539out_acl:
2540 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2541 p = xdr_reserve_space(xdr, 4);
2542 if (!p)
2543 goto out_resource;
2544 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2545 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2546 }
2547 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2548 p = xdr_reserve_space(xdr, 4);
2549 if (!p)
2550 goto out_resource;
2551 *p++ = cpu_to_be32(1);
2552 }
2553 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2554 p = xdr_reserve_space(xdr, 4);
2555 if (!p)
2556 goto out_resource;
2557 *p++ = cpu_to_be32(0);
2558 }
2559 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2560 p = xdr_reserve_space(xdr, 4);
2561 if (!p)
2562 goto out_resource;
2563 *p++ = cpu_to_be32(1);
2564 }
2565 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2566 p = xdr_reserve_space(xdr, 4);
2567 if (!p)
2568 goto out_resource;
2569 *p++ = cpu_to_be32(1);
2570 }
2571 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2572 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2573 if (!p)
2574 goto out_resource;
2575 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2576 fhp->fh_handle.fh_size);
2577 }
2578 if (bmval0 & FATTR4_WORD0_FILEID) {
2579 p = xdr_reserve_space(xdr, 8);
2580 if (!p)
2581 goto out_resource;
2582 p = xdr_encode_hyper(p, stat.ino);
2583 }
2584 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2585 p = xdr_reserve_space(xdr, 8);
2586 if (!p)
2587 goto out_resource;
2588 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2589 }
2590 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2591 p = xdr_reserve_space(xdr, 8);
2592 if (!p)
2593 goto out_resource;
2594 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2595 }
2596 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2597 p = xdr_reserve_space(xdr, 8);
2598 if (!p)
2599 goto out_resource;
2600 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2601 }
2602 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2603 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2604 if (status)
2605 goto out;
2606 }
2607 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2608 p = xdr_reserve_space(xdr, 4);
2609 if (!p)
2610 goto out_resource;
2611 *p++ = cpu_to_be32(1);
2612 }
2613 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2614 p = xdr_reserve_space(xdr, 8);
2615 if (!p)
2616 goto out_resource;
2617 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2618 }
2619 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2620 p = xdr_reserve_space(xdr, 4);
2621 if (!p)
2622 goto out_resource;
2623 *p++ = cpu_to_be32(255);
2624 }
2625 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2626 p = xdr_reserve_space(xdr, 4);
2627 if (!p)
2628 goto out_resource;
2629 *p++ = cpu_to_be32(statfs.f_namelen);
2630 }
2631 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2632 p = xdr_reserve_space(xdr, 8);
2633 if (!p)
2634 goto out_resource;
2635 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2636 }
2637 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2638 p = xdr_reserve_space(xdr, 8);
2639 if (!p)
2640 goto out_resource;
2641 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2642 }
2643 if (bmval1 & FATTR4_WORD1_MODE) {
2644 p = xdr_reserve_space(xdr, 4);
2645 if (!p)
2646 goto out_resource;
2647 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2648 }
2649 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2650 p = xdr_reserve_space(xdr, 4);
2651 if (!p)
2652 goto out_resource;
2653 *p++ = cpu_to_be32(1);
2654 }
2655 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2656 p = xdr_reserve_space(xdr, 4);
2657 if (!p)
2658 goto out_resource;
2659 *p++ = cpu_to_be32(stat.nlink);
2660 }
2661 if (bmval1 & FATTR4_WORD1_OWNER) {
2662 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2663 if (status)
2664 goto out;
2665 }
2666 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2667 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2668 if (status)
2669 goto out;
2670 }
2671 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2672 p = xdr_reserve_space(xdr, 8);
2673 if (!p)
2674 goto out_resource;
2675 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2676 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2677 }
2678 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2679 p = xdr_reserve_space(xdr, 8);
2680 if (!p)
2681 goto out_resource;
2682 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2683 p = xdr_encode_hyper(p, dummy64);
2684 }
2685 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2686 p = xdr_reserve_space(xdr, 8);
2687 if (!p)
2688 goto out_resource;
2689 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2690 p = xdr_encode_hyper(p, dummy64);
2691 }
2692 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2693 p = xdr_reserve_space(xdr, 8);
2694 if (!p)
2695 goto out_resource;
2696 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2697 p = xdr_encode_hyper(p, dummy64);
2698 }
2699 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2700 p = xdr_reserve_space(xdr, 8);
2701 if (!p)
2702 goto out_resource;
2703 dummy64 = (u64)stat.blocks << 9;
2704 p = xdr_encode_hyper(p, dummy64);
2705 }
2706 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2707 p = xdr_reserve_space(xdr, 12);
2708 if (!p)
2709 goto out_resource;
2710 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2711 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2712 }
2713 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2714 p = xdr_reserve_space(xdr, 12);
2715 if (!p)
2716 goto out_resource;
2717 *p++ = cpu_to_be32(0);
2718 *p++ = cpu_to_be32(1);
2719 *p++ = cpu_to_be32(0);
2720 }
2721 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2722 p = xdr_reserve_space(xdr, 12);
2723 if (!p)
2724 goto out_resource;
2725 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2726 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2727 }
2728 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2729 p = xdr_reserve_space(xdr, 12);
2730 if (!p)
2731 goto out_resource;
2732 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2733 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2734 }
2735 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2736 struct kstat parent_stat;
2737 u64 ino = stat.ino;
2738
2739 p = xdr_reserve_space(xdr, 8);
2740 if (!p)
2741 goto out_resource;
2742 /*
2743 * Get parent's attributes if not ignoring crossmount
2744 * and this is the root of a cross-mounted filesystem.
2745 */
2746 if (ignore_crossmnt == 0 &&
2747 dentry == exp->ex_path.mnt->mnt_root) {
2748 err = get_parent_attributes(exp, &parent_stat);
2749 if (err)
2750 goto out_nfserr;
2751 ino = parent_stat.ino;
2752 }
2753 p = xdr_encode_hyper(p, ino);
2754 }
2755#ifdef CONFIG_NFSD_PNFS
2756 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2757 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2758 if (status)
2759 goto out;
2760 }
2761
2762 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2763 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2764 if (status)
2765 goto out;
2766 }
2767
2768 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2769 p = xdr_reserve_space(xdr, 4);
2770 if (!p)
2771 goto out_resource;
2772 *p++ = cpu_to_be32(stat.blksize);
2773 }
2774#endif /* CONFIG_NFSD_PNFS */
2775 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2776 status = nfsd4_encode_bitmap(xdr, NFSD_SUPPATTR_EXCLCREAT_WORD0,
2777 NFSD_SUPPATTR_EXCLCREAT_WORD1,
2778 NFSD_SUPPATTR_EXCLCREAT_WORD2);
2779 if (status)
2780 goto out;
2781 }
2782
2783 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2784 status = nfsd4_encode_security_label(xdr, rqstp, context,
2785 contextlen);
2786 if (status)
2787 goto out;
2788 }
2789
2790 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2791 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2792 status = nfs_ok;
2793
2794out:
2795#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2796 if (context)
2797 security_release_secctx(context, contextlen);
2798#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2799 kfree(acl);
2800 if (tempfh) {
2801 fh_put(tempfh);
2802 kfree(tempfh);
2803 }
2804 if (status)
2805 xdr_truncate_encode(xdr, starting_len);
2806 return status;
2807out_nfserr:
2808 status = nfserrno(err);
2809 goto out;
2810out_resource:
2811 status = nfserr_resource;
2812 goto out;
2813}
2814
2815static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2816 struct xdr_buf *buf, __be32 *p, int bytes)
2817{
2818 xdr->scratch.iov_len = 0;
2819 memset(buf, 0, sizeof(struct xdr_buf));
2820 buf->head[0].iov_base = p;
2821 buf->head[0].iov_len = 0;
2822 buf->len = 0;
2823 xdr->buf = buf;
2824 xdr->iov = buf->head;
2825 xdr->p = p;
2826 xdr->end = (void *)p + bytes;
2827 buf->buflen = bytes;
2828}
2829
2830__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2831 struct svc_fh *fhp, struct svc_export *exp,
2832 struct dentry *dentry, u32 *bmval,
2833 struct svc_rqst *rqstp, int ignore_crossmnt)
2834{
2835 struct xdr_buf dummy;
2836 struct xdr_stream xdr;
2837 __be32 ret;
2838
2839 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2840 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2841 ignore_crossmnt);
2842 *p = xdr.p;
2843 return ret;
2844}
2845
2846static inline int attributes_need_mount(u32 *bmval)
2847{
2848 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2849 return 1;
2850 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2851 return 1;
2852 return 0;
2853}
2854
2855static __be32
2856nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2857 const char *name, int namlen)
2858{
2859 struct svc_export *exp = cd->rd_fhp->fh_export;
2860 struct dentry *dentry;
2861 __be32 nfserr;
2862 int ignore_crossmnt = 0;
2863
2864 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2865 if (IS_ERR(dentry))
2866 return nfserrno(PTR_ERR(dentry));
2867 if (d_really_is_negative(dentry)) {
2868 /*
2869 * we're not holding the i_mutex here, so there's
2870 * a window where this directory entry could have gone
2871 * away.
2872 */
2873 dput(dentry);
2874 return nfserr_noent;
2875 }
2876
2877 exp_get(exp);
2878 /*
2879 * In the case of a mountpoint, the client may be asking for
2880 * attributes that are only properties of the underlying filesystem
2881 * as opposed to the cross-mounted file system. In such a case,
2882 * we will not follow the cross mount and will fill the attribtutes
2883 * directly from the mountpoint dentry.
2884 */
2885 if (nfsd_mountpoint(dentry, exp)) {
2886 int err;
2887
2888 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2889 && !attributes_need_mount(cd->rd_bmval)) {
2890 ignore_crossmnt = 1;
2891 goto out_encode;
2892 }
2893 /*
2894 * Why the heck aren't we just using nfsd_lookup??
2895 * Different "."/".." handling? Something else?
2896 * At least, add a comment here to explain....
2897 */
2898 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2899 if (err) {
2900 nfserr = nfserrno(err);
2901 goto out_put;
2902 }
2903 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2904 if (nfserr)
2905 goto out_put;
2906
2907 }
2908out_encode:
2909 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2910 cd->rd_rqstp, ignore_crossmnt);
2911out_put:
2912 dput(dentry);
2913 exp_put(exp);
2914 return nfserr;
2915}
2916
2917static __be32 *
2918nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2919{
2920 __be32 *p;
2921
2922 p = xdr_reserve_space(xdr, 20);
2923 if (!p)
2924 return NULL;
2925 *p++ = htonl(2);
2926 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2927 *p++ = htonl(0); /* bmval1 */
2928
2929 *p++ = htonl(4); /* attribute length */
2930 *p++ = nfserr; /* no htonl */
2931 return p;
2932}
2933
2934static int
2935nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2936 loff_t offset, u64 ino, unsigned int d_type)
2937{
2938 struct readdir_cd *ccd = ccdv;
2939 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2940 struct xdr_stream *xdr = cd->xdr;
2941 int start_offset = xdr->buf->len;
2942 int cookie_offset;
2943 u32 name_and_cookie;
2944 int entry_bytes;
2945 __be32 nfserr = nfserr_toosmall;
2946 __be64 wire_offset;
2947 __be32 *p;
2948
2949 /* In nfsv4, "." and ".." never make it onto the wire.. */
2950 if (name && isdotent(name, namlen)) {
2951 cd->common.err = nfs_ok;
2952 return 0;
2953 }
2954
2955 if (cd->cookie_offset) {
2956 wire_offset = cpu_to_be64(offset);
2957 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2958 &wire_offset, 8);
2959 }
2960
2961 p = xdr_reserve_space(xdr, 4);
2962 if (!p)
2963 goto fail;
2964 *p++ = xdr_one; /* mark entry present */
2965 cookie_offset = xdr->buf->len;
2966 p = xdr_reserve_space(xdr, 3*4 + namlen);
2967 if (!p)
2968 goto fail;
2969 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2970 p = xdr_encode_array(p, name, namlen); /* name length & name */
2971
2972 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2973 switch (nfserr) {
2974 case nfs_ok:
2975 break;
2976 case nfserr_resource:
2977 nfserr = nfserr_toosmall;
2978 goto fail;
2979 case nfserr_noent:
2980 xdr_truncate_encode(xdr, start_offset);
2981 goto skip_entry;
2982 default:
2983 /*
2984 * If the client requested the RDATTR_ERROR attribute,
2985 * we stuff the error code into this attribute
2986 * and continue. If this attribute was not requested,
2987 * then in accordance with the spec, we fail the
2988 * entire READDIR operation(!)
2989 */
2990 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2991 goto fail;
2992 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2993 if (p == NULL) {
2994 nfserr = nfserr_toosmall;
2995 goto fail;
2996 }
2997 }
2998 nfserr = nfserr_toosmall;
2999 entry_bytes = xdr->buf->len - start_offset;
3000 if (entry_bytes > cd->rd_maxcount)
3001 goto fail;
3002 cd->rd_maxcount -= entry_bytes;
3003 /*
3004 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3005 * let's always let through the first entry, at least:
3006 */
3007 if (!cd->rd_dircount)
3008 goto fail;
3009 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3010 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3011 goto fail;
3012 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3013
3014 cd->cookie_offset = cookie_offset;
3015skip_entry:
3016 cd->common.err = nfs_ok;
3017 return 0;
3018fail:
3019 xdr_truncate_encode(xdr, start_offset);
3020 cd->common.err = nfserr;
3021 return -EINVAL;
3022}
3023
3024static __be32
3025nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3026{
3027 __be32 *p;
3028
3029 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3030 if (!p)
3031 return nfserr_resource;
3032 *p++ = cpu_to_be32(sid->si_generation);
3033 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3034 sizeof(stateid_opaque_t));
3035 return 0;
3036}
3037
3038static __be32
3039nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3040{
3041 struct xdr_stream *xdr = &resp->xdr;
3042 __be32 *p;
3043
3044 if (!nfserr) {
3045 p = xdr_reserve_space(xdr, 8);
3046 if (!p)
3047 return nfserr_resource;
3048 *p++ = cpu_to_be32(access->ac_supported);
3049 *p++ = cpu_to_be32(access->ac_resp_access);
3050 }
3051 return nfserr;
3052}
3053
3054static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3055{
3056 struct xdr_stream *xdr = &resp->xdr;
3057 __be32 *p;
3058
3059 if (!nfserr) {
3060 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3061 if (!p)
3062 return nfserr_resource;
3063 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3064 NFS4_MAX_SESSIONID_LEN);
3065 *p++ = cpu_to_be32(bcts->dir);
3066 /* Upshifting from TCP to RDMA is not supported */
3067 *p++ = cpu_to_be32(0);
3068 }
3069 return nfserr;
3070}
3071
3072static __be32
3073nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3074{
3075 struct xdr_stream *xdr = &resp->xdr;
3076
3077 if (!nfserr)
3078 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3079
3080 return nfserr;
3081}
3082
3083
3084static __be32
3085nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3086{
3087 struct xdr_stream *xdr = &resp->xdr;
3088 __be32 *p;
3089
3090 if (!nfserr) {
3091 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3092 if (!p)
3093 return nfserr_resource;
3094 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3095 NFS4_VERIFIER_SIZE);
3096 }
3097 return nfserr;
3098}
3099
3100static __be32
3101nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3102{
3103 struct xdr_stream *xdr = &resp->xdr;
3104 __be32 *p;
3105
3106 if (!nfserr) {
3107 p = xdr_reserve_space(xdr, 20);
3108 if (!p)
3109 return nfserr_resource;
3110 encode_cinfo(p, &create->cr_cinfo);
3111 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3112 create->cr_bmval[1], create->cr_bmval[2]);
3113 }
3114 return nfserr;
3115}
3116
3117static __be32
3118nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3119{
3120 struct svc_fh *fhp = getattr->ga_fhp;
3121 struct xdr_stream *xdr = &resp->xdr;
3122
3123 if (nfserr)
3124 return nfserr;
3125
3126 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3127 getattr->ga_bmval,
3128 resp->rqstp, 0);
3129 return nfserr;
3130}
3131
3132static __be32
3133nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3134{
3135 struct xdr_stream *xdr = &resp->xdr;
3136 struct svc_fh *fhp = *fhpp;
3137 unsigned int len;
3138 __be32 *p;
3139
3140 if (!nfserr) {
3141 len = fhp->fh_handle.fh_size;
3142 p = xdr_reserve_space(xdr, len + 4);
3143 if (!p)
3144 return nfserr_resource;
3145 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3146 }
3147 return nfserr;
3148}
3149
3150/*
3151* Including all fields other than the name, a LOCK4denied structure requires
3152* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3153*/
3154static __be32
3155nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3156{
3157 struct xdr_netobj *conf = &ld->ld_owner;
3158 __be32 *p;
3159
3160again:
3161 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3162 if (!p) {
3163 /*
3164 * Don't fail to return the result just because we can't
3165 * return the conflicting open:
3166 */
3167 if (conf->len) {
3168 kfree(conf->data);
3169 conf->len = 0;
3170 conf->data = NULL;
3171 goto again;
3172 }
3173 return nfserr_resource;
3174 }
3175 p = xdr_encode_hyper(p, ld->ld_start);
3176 p = xdr_encode_hyper(p, ld->ld_length);
3177 *p++ = cpu_to_be32(ld->ld_type);
3178 if (conf->len) {
3179 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3180 p = xdr_encode_opaque(p, conf->data, conf->len);
3181 kfree(conf->data);
3182 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3183 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3184 *p++ = cpu_to_be32(0); /* length of owner name */
3185 }
3186 return nfserr_denied;
3187}
3188
3189static __be32
3190nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3191{
3192 struct xdr_stream *xdr = &resp->xdr;
3193
3194 if (!nfserr)
3195 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3196 else if (nfserr == nfserr_denied)
3197 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3198
3199 return nfserr;
3200}
3201
3202static __be32
3203nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3204{
3205 struct xdr_stream *xdr = &resp->xdr;
3206
3207 if (nfserr == nfserr_denied)
3208 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3209 return nfserr;
3210}
3211
3212static __be32
3213nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3214{
3215 struct xdr_stream *xdr = &resp->xdr;
3216
3217 if (!nfserr)
3218 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3219
3220 return nfserr;
3221}
3222
3223
3224static __be32
3225nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3226{
3227 struct xdr_stream *xdr = &resp->xdr;
3228 __be32 *p;
3229
3230 if (!nfserr) {
3231 p = xdr_reserve_space(xdr, 20);
3232 if (!p)
3233 return nfserr_resource;
3234 p = encode_cinfo(p, &link->li_cinfo);
3235 }
3236 return nfserr;
3237}
3238
3239
3240static __be32
3241nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3242{
3243 struct xdr_stream *xdr = &resp->xdr;
3244 __be32 *p;
3245
3246 if (nfserr)
3247 goto out;
3248
3249 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3250 if (nfserr)
3251 goto out;
3252 p = xdr_reserve_space(xdr, 24);
3253 if (!p)
3254 return nfserr_resource;
3255 p = encode_cinfo(p, &open->op_cinfo);
3256 *p++ = cpu_to_be32(open->op_rflags);
3257
3258 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3259 open->op_bmval[2]);
3260 if (nfserr)
3261 goto out;
3262
3263 p = xdr_reserve_space(xdr, 4);
3264 if (!p)
3265 return nfserr_resource;
3266
3267 *p++ = cpu_to_be32(open->op_delegate_type);
3268 switch (open->op_delegate_type) {
3269 case NFS4_OPEN_DELEGATE_NONE:
3270 break;
3271 case NFS4_OPEN_DELEGATE_READ:
3272 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3273 if (nfserr)
3274 return nfserr;
3275 p = xdr_reserve_space(xdr, 20);
3276 if (!p)
3277 return nfserr_resource;
3278 *p++ = cpu_to_be32(open->op_recall);
3279
3280 /*
3281 * TODO: ACE's in delegations
3282 */
3283 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3284 *p++ = cpu_to_be32(0);
3285 *p++ = cpu_to_be32(0);
3286 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3287 break;
3288 case NFS4_OPEN_DELEGATE_WRITE:
3289 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3290 if (nfserr)
3291 return nfserr;
3292 p = xdr_reserve_space(xdr, 32);
3293 if (!p)
3294 return nfserr_resource;
3295 *p++ = cpu_to_be32(0);
3296
3297 /*
3298 * TODO: space_limit's in delegations
3299 */
3300 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3301 *p++ = cpu_to_be32(~(u32)0);
3302 *p++ = cpu_to_be32(~(u32)0);
3303
3304 /*
3305 * TODO: ACE's in delegations
3306 */
3307 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3308 *p++ = cpu_to_be32(0);
3309 *p++ = cpu_to_be32(0);
3310 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3311 break;
3312 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3313 switch (open->op_why_no_deleg) {
3314 case WND4_CONTENTION:
3315 case WND4_RESOURCE:
3316 p = xdr_reserve_space(xdr, 8);
3317 if (!p)
3318 return nfserr_resource;
3319 *p++ = cpu_to_be32(open->op_why_no_deleg);
3320 /* deleg signaling not supported yet: */
3321 *p++ = cpu_to_be32(0);
3322 break;
3323 default:
3324 p = xdr_reserve_space(xdr, 4);
3325 if (!p)
3326 return nfserr_resource;
3327 *p++ = cpu_to_be32(open->op_why_no_deleg);
3328 }
3329 break;
3330 default:
3331 BUG();
3332 }
3333 /* XXX save filehandle here */
3334out:
3335 return nfserr;
3336}
3337
3338static __be32
3339nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3340{
3341 struct xdr_stream *xdr = &resp->xdr;
3342
3343 if (!nfserr)
3344 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3345
3346 return nfserr;
3347}
3348
3349static __be32
3350nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3351{
3352 struct xdr_stream *xdr = &resp->xdr;
3353
3354 if (!nfserr)
3355 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3356
3357 return nfserr;
3358}
3359
3360static __be32 nfsd4_encode_splice_read(
3361 struct nfsd4_compoundres *resp,
3362 struct nfsd4_read *read,
3363 struct file *file, unsigned long maxcount)
3364{
3365 struct xdr_stream *xdr = &resp->xdr;
3366 struct xdr_buf *buf = xdr->buf;
3367 u32 eof;
3368 long len;
3369 int space_left;
3370 __be32 nfserr;
3371 __be32 *p = xdr->p - 2;
3372
3373 /* Make sure there will be room for padding if needed */
3374 if (xdr->end - xdr->p < 1)
3375 return nfserr_resource;
3376
3377 len = maxcount;
3378 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3379 read->rd_offset, &maxcount);
3380 if (nfserr) {
3381 /*
3382 * nfsd_splice_actor may have already messed with the
3383 * page length; reset it so as not to confuse
3384 * xdr_truncate_encode:
3385 */
3386 buf->page_len = 0;
3387 return nfserr;
3388 }
3389
3390 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3391 d_inode(read->rd_fhp->fh_dentry)->i_size);
3392
3393 *(p++) = htonl(eof);
3394 *(p++) = htonl(maxcount);
3395
3396 buf->page_len = maxcount;
3397 buf->len += maxcount;
3398 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3399 / PAGE_SIZE;
3400
3401 /* Use rest of head for padding and remaining ops: */
3402 buf->tail[0].iov_base = xdr->p;
3403 buf->tail[0].iov_len = 0;
3404 xdr->iov = buf->tail;
3405 if (maxcount&3) {
3406 int pad = 4 - (maxcount&3);
3407
3408 *(xdr->p++) = 0;
3409
3410 buf->tail[0].iov_base += maxcount&3;
3411 buf->tail[0].iov_len = pad;
3412 buf->len += pad;
3413 }
3414
3415 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3416 buf->buflen - buf->len);
3417 buf->buflen = buf->len + space_left;
3418 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3419
3420 return 0;
3421}
3422
3423static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3424 struct nfsd4_read *read,
3425 struct file *file, unsigned long maxcount)
3426{
3427 struct xdr_stream *xdr = &resp->xdr;
3428 u32 eof;
3429 int v;
3430 int starting_len = xdr->buf->len - 8;
3431 long len;
3432 int thislen;
3433 __be32 nfserr;
3434 __be32 tmp;
3435 __be32 *p;
3436 u32 zzz = 0;
3437 int pad;
3438
3439 len = maxcount;
3440 v = 0;
3441
3442 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3443 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3444 WARN_ON_ONCE(!p);
3445 resp->rqstp->rq_vec[v].iov_base = p;
3446 resp->rqstp->rq_vec[v].iov_len = thislen;
3447 v++;
3448 len -= thislen;
3449
3450 while (len) {
3451 thislen = min_t(long, len, PAGE_SIZE);
3452 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3453 WARN_ON_ONCE(!p);
3454 resp->rqstp->rq_vec[v].iov_base = p;
3455 resp->rqstp->rq_vec[v].iov_len = thislen;
3456 v++;
3457 len -= thislen;
3458 }
3459 read->rd_vlen = v;
3460
3461 len = maxcount;
3462 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3463 read->rd_vlen, &maxcount);
3464 if (nfserr)
3465 return nfserr;
3466 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3467
3468 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3469 d_inode(read->rd_fhp->fh_dentry)->i_size);
3470
3471 tmp = htonl(eof);
3472 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3473 tmp = htonl(maxcount);
3474 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3475
3476 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3477 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3478 &zzz, pad);
3479 return 0;
3480
3481}
3482
3483static __be32
3484nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3485 struct nfsd4_read *read)
3486{
3487 unsigned long maxcount;
3488 struct xdr_stream *xdr = &resp->xdr;
3489 struct file *file = read->rd_filp;
3490 int starting_len = xdr->buf->len;
3491 struct raparms *ra = NULL;
3492 __be32 *p;
3493
3494 if (nfserr)
3495 goto out;
3496
3497 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3498 if (!p) {
3499 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3500 nfserr = nfserr_resource;
3501 goto out;
3502 }
3503 if (resp->xdr.buf->page_len &&
3504 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3505 WARN_ON_ONCE(1);
3506 nfserr = nfserr_resource;
3507 goto out;
3508 }
3509 xdr_commit_encode(xdr);
3510
3511 maxcount = svc_max_payload(resp->rqstp);
3512 maxcount = min_t(unsigned long, maxcount,
3513 (xdr->buf->buflen - xdr->buf->len));
3514 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3515
3516 if (read->rd_tmp_file)
3517 ra = nfsd_init_raparms(file);
3518
3519 if (file->f_op->splice_read &&
3520 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3521 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3522 else
3523 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3524
3525 if (ra)
3526 nfsd_put_raparams(file, ra);
3527
3528 if (nfserr)
3529 xdr_truncate_encode(xdr, starting_len);
3530
3531out:
3532 if (file)
3533 fput(file);
3534 return nfserr;
3535}
3536
3537static __be32
3538nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3539{
3540 int maxcount;
3541 __be32 wire_count;
3542 int zero = 0;
3543 struct xdr_stream *xdr = &resp->xdr;
3544 int length_offset = xdr->buf->len;
3545 __be32 *p;
3546
3547 if (nfserr)
3548 return nfserr;
3549
3550 p = xdr_reserve_space(xdr, 4);
3551 if (!p)
3552 return nfserr_resource;
3553 maxcount = PAGE_SIZE;
3554
3555 p = xdr_reserve_space(xdr, maxcount);
3556 if (!p)
3557 return nfserr_resource;
3558 /*
3559 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3560 * if they would overflow the buffer. Is this kosher in NFSv4? If
3561 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3562 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3563 */
3564 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3565 (char *)p, &maxcount);
3566 if (nfserr == nfserr_isdir)
3567 nfserr = nfserr_inval;
3568 if (nfserr) {
3569 xdr_truncate_encode(xdr, length_offset);
3570 return nfserr;
3571 }
3572
3573 wire_count = htonl(maxcount);
3574 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3575 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3576 if (maxcount & 3)
3577 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3578 &zero, 4 - (maxcount&3));
3579 return 0;
3580}
3581
3582static __be32
3583nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3584{
3585 int maxcount;
3586 int bytes_left;
3587 loff_t offset;
3588 __be64 wire_offset;
3589 struct xdr_stream *xdr = &resp->xdr;
3590 int starting_len = xdr->buf->len;
3591 __be32 *p;
3592
3593 if (nfserr)
3594 return nfserr;
3595
3596 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3597 if (!p)
3598 return nfserr_resource;
3599
3600 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3601 *p++ = cpu_to_be32(0);
3602 *p++ = cpu_to_be32(0);
3603 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3604 - (char *)resp->xdr.buf->head[0].iov_base;
3605
3606 /*
3607 * Number of bytes left for directory entries allowing for the
3608 * final 8 bytes of the readdir and a following failed op:
3609 */
3610 bytes_left = xdr->buf->buflen - xdr->buf->len
3611 - COMPOUND_ERR_SLACK_SPACE - 8;
3612 if (bytes_left < 0) {
3613 nfserr = nfserr_resource;
3614 goto err_no_verf;
3615 }
3616 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3617 /*
3618 * Note the rfc defines rd_maxcount as the size of the
3619 * READDIR4resok structure, which includes the verifier above
3620 * and the 8 bytes encoded at the end of this function:
3621 */
3622 if (maxcount < 16) {
3623 nfserr = nfserr_toosmall;
3624 goto err_no_verf;
3625 }
3626 maxcount = min_t(int, maxcount-16, bytes_left);
3627
3628 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3629 if (!readdir->rd_dircount)
3630 readdir->rd_dircount = INT_MAX;
3631
3632 readdir->xdr = xdr;
3633 readdir->rd_maxcount = maxcount;
3634 readdir->common.err = 0;
3635 readdir->cookie_offset = 0;
3636
3637 offset = readdir->rd_cookie;
3638 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3639 &offset,
3640 &readdir->common, nfsd4_encode_dirent);
3641 if (nfserr == nfs_ok &&
3642 readdir->common.err == nfserr_toosmall &&
3643 xdr->buf->len == starting_len + 8) {
3644 /* nothing encoded; which limit did we hit?: */
3645 if (maxcount - 16 < bytes_left)
3646 /* It was the fault of rd_maxcount: */
3647 nfserr = nfserr_toosmall;
3648 else
3649 /* We ran out of buffer space: */
3650 nfserr = nfserr_resource;
3651 }
3652 if (nfserr)
3653 goto err_no_verf;
3654
3655 if (readdir->cookie_offset) {
3656 wire_offset = cpu_to_be64(offset);
3657 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3658 &wire_offset, 8);
3659 }
3660
3661 p = xdr_reserve_space(xdr, 8);
3662 if (!p) {
3663 WARN_ON_ONCE(1);
3664 goto err_no_verf;
3665 }
3666 *p++ = 0; /* no more entries */
3667 *p++ = htonl(readdir->common.err == nfserr_eof);
3668
3669 return 0;
3670err_no_verf:
3671 xdr_truncate_encode(xdr, starting_len);
3672 return nfserr;
3673}
3674
3675static __be32
3676nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3677{
3678 struct xdr_stream *xdr = &resp->xdr;
3679 __be32 *p;
3680
3681 if (!nfserr) {
3682 p = xdr_reserve_space(xdr, 20);
3683 if (!p)
3684 return nfserr_resource;
3685 p = encode_cinfo(p, &remove->rm_cinfo);
3686 }
3687 return nfserr;
3688}
3689
3690static __be32
3691nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3692{
3693 struct xdr_stream *xdr = &resp->xdr;
3694 __be32 *p;
3695
3696 if (!nfserr) {
3697 p = xdr_reserve_space(xdr, 40);
3698 if (!p)
3699 return nfserr_resource;
3700 p = encode_cinfo(p, &rename->rn_sinfo);
3701 p = encode_cinfo(p, &rename->rn_tinfo);
3702 }
3703 return nfserr;
3704}
3705
3706static __be32
3707nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3708 __be32 nfserr, struct svc_export *exp)
3709{
3710 u32 i, nflavs, supported;
3711 struct exp_flavor_info *flavs;
3712 struct exp_flavor_info def_flavs[2];
3713 __be32 *p, *flavorsp;
3714 static bool report = true;
3715
3716 if (nfserr)
3717 goto out;
3718 nfserr = nfserr_resource;
3719 if (exp->ex_nflavors) {
3720 flavs = exp->ex_flavors;
3721 nflavs = exp->ex_nflavors;
3722 } else { /* Handling of some defaults in absence of real secinfo: */
3723 flavs = def_flavs;
3724 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3725 nflavs = 2;
3726 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3727 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3728 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3729 nflavs = 1;
3730 flavs[0].pseudoflavor
3731 = svcauth_gss_flavor(exp->ex_client);
3732 } else {
3733 nflavs = 1;
3734 flavs[0].pseudoflavor
3735 = exp->ex_client->flavour->flavour;
3736 }
3737 }
3738
3739 supported = 0;
3740 p = xdr_reserve_space(xdr, 4);
3741 if (!p)
3742 goto out;
3743 flavorsp = p++; /* to be backfilled later */
3744
3745 for (i = 0; i < nflavs; i++) {
3746 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3747 struct rpcsec_gss_info info;
3748
3749 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3750 supported++;
3751 p = xdr_reserve_space(xdr, 4 + 4 +
3752 XDR_LEN(info.oid.len) + 4 + 4);
3753 if (!p)
3754 goto out;
3755 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3756 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3757 *p++ = cpu_to_be32(info.qop);
3758 *p++ = cpu_to_be32(info.service);
3759 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3760 supported++;
3761 p = xdr_reserve_space(xdr, 4);
3762 if (!p)
3763 goto out;
3764 *p++ = cpu_to_be32(pf);
3765 } else {
3766 if (report)
3767 pr_warn("NFS: SECINFO: security flavor %u "
3768 "is not supported\n", pf);
3769 }
3770 }
3771
3772 if (nflavs != supported)
3773 report = false;
3774 *flavorsp = htonl(supported);
3775 nfserr = 0;
3776out:
3777 if (exp)
3778 exp_put(exp);
3779 return nfserr;
3780}
3781
3782static __be32
3783nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3784 struct nfsd4_secinfo *secinfo)
3785{
3786 struct xdr_stream *xdr = &resp->xdr;
3787
3788 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3789}
3790
3791static __be32
3792nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3793 struct nfsd4_secinfo_no_name *secinfo)
3794{
3795 struct xdr_stream *xdr = &resp->xdr;
3796
3797 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3798}
3799
3800/*
3801 * The SETATTR encode routine is special -- it always encodes a bitmap,
3802 * regardless of the error status.
3803 */
3804static __be32
3805nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3806{
3807 struct xdr_stream *xdr = &resp->xdr;
3808 __be32 *p;
3809
3810 p = xdr_reserve_space(xdr, 16);
3811 if (!p)
3812 return nfserr_resource;
3813 if (nfserr) {
3814 *p++ = cpu_to_be32(3);
3815 *p++ = cpu_to_be32(0);
3816 *p++ = cpu_to_be32(0);
3817 *p++ = cpu_to_be32(0);
3818 }
3819 else {
3820 *p++ = cpu_to_be32(3);
3821 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3822 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3823 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3824 }
3825 return nfserr;
3826}
3827
3828static __be32
3829nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3830{
3831 struct xdr_stream *xdr = &resp->xdr;
3832 __be32 *p;
3833
3834 if (!nfserr) {
3835 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3836 if (!p)
3837 return nfserr_resource;
3838 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3839 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3840 NFS4_VERIFIER_SIZE);
3841 }
3842 else if (nfserr == nfserr_clid_inuse) {
3843 p = xdr_reserve_space(xdr, 8);
3844 if (!p)
3845 return nfserr_resource;
3846 *p++ = cpu_to_be32(0);
3847 *p++ = cpu_to_be32(0);
3848 }
3849 return nfserr;
3850}
3851
3852static __be32
3853nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3854{
3855 struct xdr_stream *xdr = &resp->xdr;
3856 __be32 *p;
3857
3858 if (!nfserr) {
3859 p = xdr_reserve_space(xdr, 16);
3860 if (!p)
3861 return nfserr_resource;
3862 *p++ = cpu_to_be32(write->wr_bytes_written);
3863 *p++ = cpu_to_be32(write->wr_how_written);
3864 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3865 NFS4_VERIFIER_SIZE);
3866 }
3867 return nfserr;
3868}
3869
3870static const u32 nfs4_minimal_spo_must_enforce[2] = {
3871 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3872 1 << (OP_EXCHANGE_ID - 32) |
3873 1 << (OP_CREATE_SESSION - 32) |
3874 1 << (OP_DESTROY_SESSION - 32) |
3875 1 << (OP_DESTROY_CLIENTID - 32)
3876};
3877
3878static __be32
3879nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3880 struct nfsd4_exchange_id *exid)
3881{
3882 struct xdr_stream *xdr = &resp->xdr;
3883 __be32 *p;
3884 char *major_id;
3885 char *server_scope;
3886 int major_id_sz;
3887 int server_scope_sz;
3888 uint64_t minor_id = 0;
3889
3890 if (nfserr)
3891 return nfserr;
3892
3893 major_id = utsname()->nodename;
3894 major_id_sz = strlen(major_id);
3895 server_scope = utsname()->nodename;
3896 server_scope_sz = strlen(server_scope);
3897
3898 p = xdr_reserve_space(xdr,
3899 8 /* eir_clientid */ +
3900 4 /* eir_sequenceid */ +
3901 4 /* eir_flags */ +
3902 4 /* spr_how */);
3903 if (!p)
3904 return nfserr_resource;
3905
3906 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3907 *p++ = cpu_to_be32(exid->seqid);
3908 *p++ = cpu_to_be32(exid->flags);
3909
3910 *p++ = cpu_to_be32(exid->spa_how);
3911
3912 switch (exid->spa_how) {
3913 case SP4_NONE:
3914 break;
3915 case SP4_MACH_CRED:
3916 /* spo_must_enforce, spo_must_allow */
3917 p = xdr_reserve_space(xdr, 16);
3918 if (!p)
3919 return nfserr_resource;
3920
3921 /* spo_must_enforce bitmap: */
3922 *p++ = cpu_to_be32(2);
3923 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3924 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3925 /* empty spo_must_allow bitmap: */
3926 *p++ = cpu_to_be32(0);
3927
3928 break;
3929 default:
3930 WARN_ON_ONCE(1);
3931 }
3932
3933 p = xdr_reserve_space(xdr,
3934 8 /* so_minor_id */ +
3935 4 /* so_major_id.len */ +
3936 (XDR_QUADLEN(major_id_sz) * 4) +
3937 4 /* eir_server_scope.len */ +
3938 (XDR_QUADLEN(server_scope_sz) * 4) +
3939 4 /* eir_server_impl_id.count (0) */);
3940 if (!p)
3941 return nfserr_resource;
3942
3943 /* The server_owner struct */
3944 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3945 /* major id */
3946 p = xdr_encode_opaque(p, major_id, major_id_sz);
3947
3948 /* Server scope */
3949 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3950
3951 /* Implementation id */
3952 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3953 return 0;
3954}
3955
3956static __be32
3957nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3958 struct nfsd4_create_session *sess)
3959{
3960 struct xdr_stream *xdr = &resp->xdr;
3961 __be32 *p;
3962
3963 if (nfserr)
3964 return nfserr;
3965
3966 p = xdr_reserve_space(xdr, 24);
3967 if (!p)
3968 return nfserr_resource;
3969 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3970 NFS4_MAX_SESSIONID_LEN);
3971 *p++ = cpu_to_be32(sess->seqid);
3972 *p++ = cpu_to_be32(sess->flags);
3973
3974 p = xdr_reserve_space(xdr, 28);
3975 if (!p)
3976 return nfserr_resource;
3977 *p++ = cpu_to_be32(0); /* headerpadsz */
3978 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3979 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3980 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3981 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3982 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3983 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3984
3985 if (sess->fore_channel.nr_rdma_attrs) {
3986 p = xdr_reserve_space(xdr, 4);
3987 if (!p)
3988 return nfserr_resource;
3989 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3990 }
3991
3992 p = xdr_reserve_space(xdr, 28);
3993 if (!p)
3994 return nfserr_resource;
3995 *p++ = cpu_to_be32(0); /* headerpadsz */
3996 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3997 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3998 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3999 *p++ = cpu_to_be32(sess->back_channel.maxops);
4000 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4001 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4002
4003 if (sess->back_channel.nr_rdma_attrs) {
4004 p = xdr_reserve_space(xdr, 4);
4005 if (!p)
4006 return nfserr_resource;
4007 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4008 }
4009 return 0;
4010}
4011
4012static __be32
4013nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4014 struct nfsd4_sequence *seq)
4015{
4016 struct xdr_stream *xdr = &resp->xdr;
4017 __be32 *p;
4018
4019 if (nfserr)
4020 return nfserr;
4021
4022 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4023 if (!p)
4024 return nfserr_resource;
4025 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4026 NFS4_MAX_SESSIONID_LEN);
4027 *p++ = cpu_to_be32(seq->seqid);
4028 *p++ = cpu_to_be32(seq->slotid);
4029 /* Note slotid's are numbered from zero: */
4030 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4031 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4032 *p++ = cpu_to_be32(seq->status_flags);
4033
4034 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4035 return 0;
4036}
4037
4038static __be32
4039nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4040 struct nfsd4_test_stateid *test_stateid)
4041{
4042 struct xdr_stream *xdr = &resp->xdr;
4043 struct nfsd4_test_stateid_id *stateid, *next;
4044 __be32 *p;
4045
4046 if (nfserr)
4047 return nfserr;
4048
4049 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4050 if (!p)
4051 return nfserr_resource;
4052 *p++ = htonl(test_stateid->ts_num_ids);
4053
4054 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4055 *p++ = stateid->ts_id_status;
4056 }
4057
4058 return nfserr;
4059}
4060
4061#ifdef CONFIG_NFSD_PNFS
4062static __be32
4063nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4064 struct nfsd4_getdeviceinfo *gdev)
4065{
4066 struct xdr_stream *xdr = &resp->xdr;
4067 const struct nfsd4_layout_ops *ops =
4068 nfsd4_layout_ops[gdev->gd_layout_type];
4069 u32 starting_len = xdr->buf->len, needed_len;
4070 __be32 *p;
4071
4072 dprintk("%s: err %d\n", __func__, nfserr);
4073 if (nfserr)
4074 goto out;
4075
4076 nfserr = nfserr_resource;
4077 p = xdr_reserve_space(xdr, 4);
4078 if (!p)
4079 goto out;
4080
4081 *p++ = cpu_to_be32(gdev->gd_layout_type);
4082
4083 /* If maxcount is 0 then just update notifications */
4084 if (gdev->gd_maxcount != 0) {
4085 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4086 if (nfserr) {
4087 /*
4088 * We don't bother to burden the layout drivers with
4089 * enforcing gd_maxcount, just tell the client to
4090 * come back with a bigger buffer if it's not enough.
4091 */
4092 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4093 goto toosmall;
4094 goto out;
4095 }
4096 }
4097
4098 nfserr = nfserr_resource;
4099 if (gdev->gd_notify_types) {
4100 p = xdr_reserve_space(xdr, 4 + 4);
4101 if (!p)
4102 goto out;
4103 *p++ = cpu_to_be32(1); /* bitmap length */
4104 *p++ = cpu_to_be32(gdev->gd_notify_types);
4105 } else {
4106 p = xdr_reserve_space(xdr, 4);
4107 if (!p)
4108 goto out;
4109 *p++ = 0;
4110 }
4111
4112 nfserr = 0;
4113out:
4114 kfree(gdev->gd_device);
4115 dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4116 return nfserr;
4117
4118toosmall:
4119 dprintk("%s: maxcount too small\n", __func__);
4120 needed_len = xdr->buf->len + 4 /* notifications */;
4121 xdr_truncate_encode(xdr, starting_len);
4122 p = xdr_reserve_space(xdr, 4);
4123 if (!p) {
4124 nfserr = nfserr_resource;
4125 } else {
4126 *p++ = cpu_to_be32(needed_len);
4127 nfserr = nfserr_toosmall;
4128 }
4129 goto out;
4130}
4131
4132static __be32
4133nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4134 struct nfsd4_layoutget *lgp)
4135{
4136 struct xdr_stream *xdr = &resp->xdr;
4137 const struct nfsd4_layout_ops *ops =
4138 nfsd4_layout_ops[lgp->lg_layout_type];
4139 __be32 *p;
4140
4141 dprintk("%s: err %d\n", __func__, nfserr);
4142 if (nfserr)
4143 goto out;
4144
4145 nfserr = nfserr_resource;
4146 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4147 if (!p)
4148 goto out;
4149
4150 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4151 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4152 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4153 sizeof(stateid_opaque_t));
4154
4155 *p++ = cpu_to_be32(1); /* we always return a single layout */
4156 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4157 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4158 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4159 *p++ = cpu_to_be32(lgp->lg_layout_type);
4160
4161 nfserr = ops->encode_layoutget(xdr, lgp);
4162out:
4163 kfree(lgp->lg_content);
4164 return nfserr;
4165}
4166
4167static __be32
4168nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4169 struct nfsd4_layoutcommit *lcp)
4170{
4171 struct xdr_stream *xdr = &resp->xdr;
4172 __be32 *p;
4173
4174 if (nfserr)
4175 return nfserr;
4176
4177 p = xdr_reserve_space(xdr, 4);
4178 if (!p)
4179 return nfserr_resource;
4180 *p++ = cpu_to_be32(lcp->lc_size_chg);
4181 if (lcp->lc_size_chg) {
4182 p = xdr_reserve_space(xdr, 8);
4183 if (!p)
4184 return nfserr_resource;
4185 p = xdr_encode_hyper(p, lcp->lc_newsize);
4186 }
4187
4188 return nfs_ok;
4189}
4190
4191static __be32
4192nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4193 struct nfsd4_layoutreturn *lrp)
4194{
4195 struct xdr_stream *xdr = &resp->xdr;
4196 __be32 *p;
4197
4198 if (nfserr)
4199 return nfserr;
4200
4201 p = xdr_reserve_space(xdr, 4);
4202 if (!p)
4203 return nfserr_resource;
4204 *p++ = cpu_to_be32(lrp->lrs_present);
4205 if (lrp->lrs_present)
4206 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4207 return nfs_ok;
4208}
4209#endif /* CONFIG_NFSD_PNFS */
4210
4211static __be32
4212nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4213 struct nfsd4_seek *seek)
4214{
4215 __be32 *p;
4216
4217 if (nfserr)
4218 return nfserr;
4219
4220 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4221 *p++ = cpu_to_be32(seek->seek_eof);
4222 p = xdr_encode_hyper(p, seek->seek_pos);
4223
4224 return nfserr;
4225}
4226
4227static __be32
4228nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4229{
4230 return nfserr;
4231}
4232
4233typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4234
4235/*
4236 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4237 * since we don't need to filter out obsolete ops as this is
4238 * done in the decoding phase.
4239 */
4240static nfsd4_enc nfsd4_enc_ops[] = {
4241 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4242 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4243 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4244 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4245 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4246 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4247 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4248 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4249 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4250 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4251 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4252 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4253 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4254 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4256 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4257 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4258 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4259 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4260 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4261 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4262 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4264 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4265 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4266 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4267 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4268 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4269 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4272 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4273 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4274 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4275 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4276 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4277 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4278
4279 /* NFSv4.1 operations */
4280 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4281 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4282 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4283 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4284 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4285 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4286 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4287#ifdef CONFIG_NFSD_PNFS
4288 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4289 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4290 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4291 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4292 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4293#else
4294 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4295 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4296 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4297 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4299#endif
4300 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4301 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4302 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4304 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4307
4308 /* NFSv4.2 operations */
4309 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4310 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4312 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4313 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4315 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4316 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4317 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4318 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4319 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4320 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4322};
4323
4324/*
4325 * Calculate whether we still have space to encode repsize bytes.
4326 * There are two considerations:
4327 * - For NFS versions >=4.1, the size of the reply must stay within
4328 * session limits
4329 * - For all NFS versions, we must stay within limited preallocated
4330 * buffer space.
4331 *
4332 * This is called before the operation is processed, so can only provide
4333 * an upper estimate. For some nonidempotent operations (such as
4334 * getattr), it's not necessarily a problem if that estimate is wrong,
4335 * as we can fail it after processing without significant side effects.
4336 */
4337__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4338{
4339 struct xdr_buf *buf = &resp->rqstp->rq_res;
4340 struct nfsd4_slot *slot = resp->cstate.slot;
4341
4342 if (buf->len + respsize <= buf->buflen)
4343 return nfs_ok;
4344 if (!nfsd4_has_session(&resp->cstate))
4345 return nfserr_resource;
4346 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4347 WARN_ON_ONCE(1);
4348 return nfserr_rep_too_big_to_cache;
4349 }
4350 return nfserr_rep_too_big;
4351}
4352
4353void
4354nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4355{
4356 struct xdr_stream *xdr = &resp->xdr;
4357 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4358 struct svc_rqst *rqstp = resp->rqstp;
4359 int post_err_offset;
4360 nfsd4_enc encoder;
4361 __be32 *p;
4362
4363 p = xdr_reserve_space(xdr, 8);
4364 if (!p) {
4365 WARN_ON_ONCE(1);
4366 return;
4367 }
4368 *p++ = cpu_to_be32(op->opnum);
4369 post_err_offset = xdr->buf->len;
4370
4371 if (op->opnum == OP_ILLEGAL)
4372 goto status;
4373 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4374 !nfsd4_enc_ops[op->opnum]);
4375 encoder = nfsd4_enc_ops[op->opnum];
4376 op->status = encoder(resp, op->status, &op->u);
4377 xdr_commit_encode(xdr);
4378
4379 /* nfsd4_check_resp_size guarantees enough room for error status */
4380 if (!op->status) {
4381 int space_needed = 0;
4382 if (!nfsd4_last_compound_op(rqstp))
4383 space_needed = COMPOUND_ERR_SLACK_SPACE;
4384 op->status = nfsd4_check_resp_size(resp, space_needed);
4385 }
4386 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4387 struct nfsd4_slot *slot = resp->cstate.slot;
4388
4389 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4390 op->status = nfserr_rep_too_big_to_cache;
4391 else
4392 op->status = nfserr_rep_too_big;
4393 }
4394 if (op->status == nfserr_resource ||
4395 op->status == nfserr_rep_too_big ||
4396 op->status == nfserr_rep_too_big_to_cache) {
4397 /*
4398 * The operation may have already been encoded or
4399 * partially encoded. No op returns anything additional
4400 * in the case of one of these three errors, so we can
4401 * just truncate back to after the status. But it's a
4402 * bug if we had to do this on a non-idempotent op:
4403 */
4404 warn_on_nonidempotent_op(op);
4405 xdr_truncate_encode(xdr, post_err_offset);
4406 }
4407 if (so) {
4408 int len = xdr->buf->len - post_err_offset;
4409
4410 so->so_replay.rp_status = op->status;
4411 so->so_replay.rp_buflen = len;
4412 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4413 so->so_replay.rp_buf, len);
4414 }
4415status:
4416 /* Note that op->status is already in network byte order: */
4417 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4418}
4419
4420/*
4421 * Encode the reply stored in the stateowner reply cache
4422 *
4423 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4424 * previously sent already encoded operation.
4425 */
4426void
4427nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4428{
4429 __be32 *p;
4430 struct nfs4_replay *rp = op->replay;
4431
4432 BUG_ON(!rp);
4433
4434 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4435 if (!p) {
4436 WARN_ON_ONCE(1);
4437 return;
4438 }
4439 *p++ = cpu_to_be32(op->opnum);
4440 *p++ = rp->rp_status; /* already xdr'ed */
4441
4442 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4443}
4444
4445int
4446nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4447{
4448 return xdr_ressize_check(rqstp, p);
4449}
4450
4451int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4452{
4453 struct svc_rqst *rqstp = rq;
4454 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4455
4456 if (args->ops != args->iops) {
4457 kfree(args->ops);
4458 args->ops = args->iops;
4459 }
4460 kfree(args->tmpp);
4461 args->tmpp = NULL;
4462 while (args->to_free) {
4463 struct svcxdr_tmpbuf *tb = args->to_free;
4464 args->to_free = tb->next;
4465 kfree(tb);
4466 }
4467 return 1;
4468}
4469
4470int
4471nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4472{
4473 if (rqstp->rq_arg.head[0].iov_len % 4) {
4474 /* client is nuts */
4475 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4476 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4477 return 0;
4478 }
4479 args->p = p;
4480 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4481 args->pagelist = rqstp->rq_arg.pages;
4482 args->pagelen = rqstp->rq_arg.page_len;
4483 args->tmpp = NULL;
4484 args->to_free = NULL;
4485 args->ops = args->iops;
4486 args->rqstp = rqstp;
4487
4488 return !nfsd4_decode_compound(args);
4489}
4490
4491int
4492nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4493{
4494 /*
4495 * All that remains is to write the tag and operation count...
4496 */
4497 struct xdr_buf *buf = resp->xdr.buf;
4498
4499 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4500 buf->tail[0].iov_len);
4501
4502 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4503
4504 p = resp->tagp;
4505 *p++ = htonl(resp->taglen);
4506 memcpy(p, resp->tag, resp->taglen);
4507 p += XDR_QUADLEN(resp->taglen);
4508 *p++ = htonl(resp->opcnt);
4509
4510 nfsd4_sequence_done(resp);
4511 return 1;
4512}
4513
4514/*
4515 * Local variables:
4516 * c-basic-offset: 8
4517 * End:
4518 */
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
36#include <linux/file.h>
37#include <linux/slab.h>
38#include <linux/namei.h>
39#include <linux/statfs.h>
40#include <linux/utsname.h>
41#include <linux/pagemap.h>
42#include <linux/sunrpc/svcauth_gss.h>
43#include <linux/sunrpc/addr.h>
44#include <linux/xattr.h>
45#include <linux/vmalloc.h>
46
47#include <uapi/linux/xattr.h>
48
49#include "idmap.h"
50#include "acl.h"
51#include "xdr4.h"
52#include "vfs.h"
53#include "state.h"
54#include "cache.h"
55#include "netns.h"
56#include "pnfs.h"
57#include "filecache.h"
58
59#include "trace.h"
60
61#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
62#include <linux/security.h>
63#endif
64
65
66#define NFSDDBG_FACILITY NFSDDBG_XDR
67
68const u32 nfsd_suppattrs[3][3] = {
69 {NFSD4_SUPPORTED_ATTRS_WORD0,
70 NFSD4_SUPPORTED_ATTRS_WORD1,
71 NFSD4_SUPPORTED_ATTRS_WORD2},
72
73 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
74 NFSD4_1_SUPPORTED_ATTRS_WORD1,
75 NFSD4_1_SUPPORTED_ATTRS_WORD2},
76
77 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
78 NFSD4_1_SUPPORTED_ATTRS_WORD1,
79 NFSD4_2_SUPPORTED_ATTRS_WORD2},
80};
81
82/*
83 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
84 * directory in order to indicate to the client that a filesystem boundary is present
85 * We use a fixed fsid for a referral
86 */
87#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
88#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
89
90static __be32
91check_filename(char *str, int len)
92{
93 int i;
94
95 if (len == 0)
96 return nfserr_inval;
97 if (len > NFS4_MAXNAMLEN)
98 return nfserr_nametoolong;
99 if (isdotent(str, len))
100 return nfserr_badname;
101 for (i = 0; i < len; i++)
102 if (str[i] == '/')
103 return nfserr_badname;
104 return 0;
105}
106
107static int zero_clientid(clientid_t *clid)
108{
109 return (clid->cl_boot == 0) && (clid->cl_id == 0);
110}
111
112/**
113 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
114 * @argp: NFSv4 compound argument structure
115 * @len: length of buffer to allocate
116 *
117 * Allocates a buffer of size @len to be freed when processing the compound
118 * operation described in @argp finishes.
119 */
120static void *
121svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
122{
123 struct svcxdr_tmpbuf *tb;
124
125 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
126 if (!tb)
127 return NULL;
128 tb->next = argp->to_free;
129 argp->to_free = tb;
130 return tb->buf;
131}
132
133/*
134 * For xdr strings that need to be passed to other kernel api's
135 * as null-terminated strings.
136 *
137 * Note null-terminating in place usually isn't safe since the
138 * buffer might end on a page boundary.
139 */
140static char *
141svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
142{
143 char *p = svcxdr_tmpalloc(argp, len + 1);
144
145 if (!p)
146 return NULL;
147 memcpy(p, buf, len);
148 p[len] = '\0';
149 return p;
150}
151
152static void *
153svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 len)
154{
155 __be32 *tmp;
156
157 /*
158 * The location of the decoded data item is stable,
159 * so @p is OK to use. This is the common case.
160 */
161 if (p != argp->xdr->scratch.iov_base)
162 return p;
163
164 tmp = svcxdr_tmpalloc(argp, len);
165 if (!tmp)
166 return NULL;
167 memcpy(tmp, p, len);
168 return tmp;
169}
170
171/*
172 * NFSv4 basic data type decoders
173 */
174
175/*
176 * This helper handles variable-length opaques which belong to protocol
177 * elements that this implementation does not support.
178 */
179static __be32
180nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
181{
182 u32 len;
183
184 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
185 return nfserr_bad_xdr;
186 if (maxlen && len > maxlen)
187 return nfserr_bad_xdr;
188 if (!xdr_inline_decode(argp->xdr, len))
189 return nfserr_bad_xdr;
190
191 return nfs_ok;
192}
193
194static __be32
195nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
196{
197 __be32 *p;
198 u32 len;
199
200 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
201 return nfserr_bad_xdr;
202 if (len == 0 || len > NFS4_OPAQUE_LIMIT)
203 return nfserr_bad_xdr;
204 p = xdr_inline_decode(argp->xdr, len);
205 if (!p)
206 return nfserr_bad_xdr;
207 o->data = svcxdr_savemem(argp, p, len);
208 if (!o->data)
209 return nfserr_jukebox;
210 o->len = len;
211
212 return nfs_ok;
213}
214
215static __be32
216nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
217{
218 __be32 *p, status;
219
220 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
221 return nfserr_bad_xdr;
222 p = xdr_inline_decode(argp->xdr, *lenp);
223 if (!p)
224 return nfserr_bad_xdr;
225 status = check_filename((char *)p, *lenp);
226 if (status)
227 return status;
228 *namp = svcxdr_savemem(argp, p, *lenp);
229 if (!*namp)
230 return nfserr_jukebox;
231
232 return nfs_ok;
233}
234
235static __be32
236nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
237{
238 __be32 *p;
239
240 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
241 if (!p)
242 return nfserr_bad_xdr;
243 p = xdr_decode_hyper(p, &tv->tv_sec);
244 tv->tv_nsec = be32_to_cpup(p++);
245 if (tv->tv_nsec >= (u32)1000000000)
246 return nfserr_inval;
247 return nfs_ok;
248}
249
250static __be32
251nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
252{
253 __be32 *p;
254
255 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
256 if (!p)
257 return nfserr_bad_xdr;
258 memcpy(verf->data, p, sizeof(verf->data));
259 return nfs_ok;
260}
261
262/**
263 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
264 * @argp: NFSv4 compound argument structure
265 * @bmval: pointer to an array of u32's to decode into
266 * @bmlen: size of the @bmval array
267 *
268 * The server needs to return nfs_ok rather than nfserr_bad_xdr when
269 * encountering bitmaps containing bits it does not recognize. This
270 * includes bits in bitmap words past WORDn, where WORDn is the last
271 * bitmap WORD the implementation currently supports. Thus we are
272 * careful here to simply ignore bits in bitmap words that this
273 * implementation has yet to support explicitly.
274 *
275 * Return values:
276 * %nfs_ok: @bmval populated successfully
277 * %nfserr_bad_xdr: the encoded bitmap was invalid
278 */
279static __be32
280nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
281{
282 ssize_t status;
283
284 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
285 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
286}
287
288static __be32
289nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
290{
291 __be32 *p, status;
292 u32 length;
293
294 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
295 return nfserr_bad_xdr;
296 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
297 return nfserr_bad_xdr;
298 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
299 return nfserr_bad_xdr;
300
301 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
302 return nfserr_bad_xdr;
303 p = xdr_inline_decode(argp->xdr, length);
304 if (!p)
305 return nfserr_bad_xdr;
306 ace->whotype = nfs4_acl_get_whotype((char *)p, length);
307 if (ace->whotype != NFS4_ACL_WHO_NAMED)
308 status = nfs_ok;
309 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
310 status = nfsd_map_name_to_gid(argp->rqstp,
311 (char *)p, length, &ace->who_gid);
312 else
313 status = nfsd_map_name_to_uid(argp->rqstp,
314 (char *)p, length, &ace->who_uid);
315
316 return status;
317}
318
319/* A counted array of nfsace4's */
320static noinline __be32
321nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
322{
323 struct nfs4_ace *ace;
324 __be32 status;
325 u32 count;
326
327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
328 return nfserr_bad_xdr;
329
330 if (count > xdr_stream_remaining(argp->xdr) / 20)
331 /*
332 * Even with 4-byte names there wouldn't be
333 * space for that many aces; something fishy is
334 * going on:
335 */
336 return nfserr_fbig;
337
338 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
339 if (*acl == NULL)
340 return nfserr_jukebox;
341
342 (*acl)->naces = count;
343 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
344 status = nfsd4_decode_nfsace4(argp, ace);
345 if (status)
346 return status;
347 }
348
349 return nfs_ok;
350}
351
352static noinline __be32
353nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
354 struct xdr_netobj *label)
355{
356 u32 lfs, pi, length;
357 __be32 *p;
358
359 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
360 return nfserr_bad_xdr;
361 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
362 return nfserr_bad_xdr;
363
364 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
365 return nfserr_bad_xdr;
366 if (length > NFS4_MAXLABELLEN)
367 return nfserr_badlabel;
368 p = xdr_inline_decode(argp->xdr, length);
369 if (!p)
370 return nfserr_bad_xdr;
371 label->len = length;
372 label->data = svcxdr_dupstr(argp, p, length);
373 if (!label->data)
374 return nfserr_jukebox;
375
376 return nfs_ok;
377}
378
379static __be32
380nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
381 struct iattr *iattr, struct nfs4_acl **acl,
382 struct xdr_netobj *label, int *umask)
383{
384 unsigned int starting_pos;
385 u32 attrlist4_count;
386 __be32 *p, status;
387
388 iattr->ia_valid = 0;
389 status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
390 if (status)
391 return nfserr_bad_xdr;
392
393 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
394 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
395 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
396 if (nfsd_attrs_supported(argp->minorversion, bmval))
397 return nfserr_inval;
398 return nfserr_attrnotsupp;
399 }
400
401 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
402 return nfserr_bad_xdr;
403 starting_pos = xdr_stream_pos(argp->xdr);
404
405 if (bmval[0] & FATTR4_WORD0_SIZE) {
406 u64 size;
407
408 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
409 return nfserr_bad_xdr;
410 iattr->ia_size = size;
411 iattr->ia_valid |= ATTR_SIZE;
412 }
413 if (bmval[0] & FATTR4_WORD0_ACL) {
414 status = nfsd4_decode_acl(argp, acl);
415 if (status)
416 return status;
417 } else
418 *acl = NULL;
419 if (bmval[1] & FATTR4_WORD1_MODE) {
420 u32 mode;
421
422 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
423 return nfserr_bad_xdr;
424 iattr->ia_mode = mode;
425 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
426 iattr->ia_valid |= ATTR_MODE;
427 }
428 if (bmval[1] & FATTR4_WORD1_OWNER) {
429 u32 length;
430
431 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
432 return nfserr_bad_xdr;
433 p = xdr_inline_decode(argp->xdr, length);
434 if (!p)
435 return nfserr_bad_xdr;
436 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
437 &iattr->ia_uid);
438 if (status)
439 return status;
440 iattr->ia_valid |= ATTR_UID;
441 }
442 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
443 u32 length;
444
445 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
446 return nfserr_bad_xdr;
447 p = xdr_inline_decode(argp->xdr, length);
448 if (!p)
449 return nfserr_bad_xdr;
450 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
451 &iattr->ia_gid);
452 if (status)
453 return status;
454 iattr->ia_valid |= ATTR_GID;
455 }
456 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
457 u32 set_it;
458
459 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
460 return nfserr_bad_xdr;
461 switch (set_it) {
462 case NFS4_SET_TO_CLIENT_TIME:
463 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
464 if (status)
465 return status;
466 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
467 break;
468 case NFS4_SET_TO_SERVER_TIME:
469 iattr->ia_valid |= ATTR_ATIME;
470 break;
471 default:
472 return nfserr_bad_xdr;
473 }
474 }
475 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
476 struct timespec64 ts;
477
478 /* No Linux filesystem supports setting this attribute. */
479 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
480 status = nfsd4_decode_nfstime4(argp, &ts);
481 if (status)
482 return status;
483 }
484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
485 u32 set_it;
486
487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
488 return nfserr_bad_xdr;
489 switch (set_it) {
490 case NFS4_SET_TO_CLIENT_TIME:
491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
492 if (status)
493 return status;
494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
495 break;
496 case NFS4_SET_TO_SERVER_TIME:
497 iattr->ia_valid |= ATTR_MTIME;
498 break;
499 default:
500 return nfserr_bad_xdr;
501 }
502 }
503 label->len = 0;
504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
506 status = nfsd4_decode_security_label(argp, label);
507 if (status)
508 return status;
509 }
510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
511 u32 mode, mask;
512
513 if (!umask)
514 return nfserr_bad_xdr;
515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
516 return nfserr_bad_xdr;
517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
519 return nfserr_bad_xdr;
520 *umask = mask & S_IRWXUGO;
521 iattr->ia_valid |= ATTR_MODE;
522 }
523
524 /* request sanity: did attrlist4 contain the expected number of words? */
525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
526 return nfserr_bad_xdr;
527
528 return nfs_ok;
529}
530
531static __be32
532nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
533{
534 __be32 *p;
535
536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
537 if (!p)
538 return nfserr_bad_xdr;
539 sid->si_generation = be32_to_cpup(p++);
540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
541 return nfs_ok;
542}
543
544static __be32
545nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
546{
547 __be32 *p;
548
549 p = xdr_inline_decode(argp->xdr, sizeof(__be64));
550 if (!p)
551 return nfserr_bad_xdr;
552 memcpy(clientid, p, sizeof(*clientid));
553 return nfs_ok;
554}
555
556static __be32
557nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
558 clientid_t *clientid, struct xdr_netobj *owner)
559{
560 __be32 status;
561
562 status = nfsd4_decode_clientid4(argp, clientid);
563 if (status)
564 return status;
565 return nfsd4_decode_opaque(argp, owner);
566}
567
568#ifdef CONFIG_NFSD_PNFS
569static __be32
570nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
571 struct nfsd4_deviceid *devid)
572{
573 __be32 *p;
574
575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
576 if (!p)
577 return nfserr_bad_xdr;
578 memcpy(devid, p, sizeof(*devid));
579 return nfs_ok;
580}
581
582static __be32
583nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
584 struct nfsd4_layoutcommit *lcp)
585{
586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
587 return nfserr_bad_xdr;
588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
589 return nfserr_bad_xdr;
590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
591 return nfserr_bad_xdr;
592
593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
594 return nfserr_bad_xdr;
595 if (lcp->lc_up_len > 0) {
596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
597 if (!lcp->lc_up_layout)
598 return nfserr_bad_xdr;
599 }
600
601 return nfs_ok;
602}
603
604static __be32
605nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
606 struct nfsd4_layoutreturn *lrp)
607{
608 __be32 status;
609
610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
611 return nfserr_bad_xdr;
612 switch (lrp->lr_return_type) {
613 case RETURN_FILE:
614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
615 return nfserr_bad_xdr;
616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
617 return nfserr_bad_xdr;
618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
619 if (status)
620 return status;
621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
622 return nfserr_bad_xdr;
623 if (lrp->lrf_body_len > 0) {
624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
625 if (!lrp->lrf_body)
626 return nfserr_bad_xdr;
627 }
628 break;
629 case RETURN_FSID:
630 case RETURN_ALL:
631 lrp->lr_seg.offset = 0;
632 lrp->lr_seg.length = NFS4_MAX_UINT64;
633 break;
634 default:
635 return nfserr_bad_xdr;
636 }
637
638 return nfs_ok;
639}
640
641#endif /* CONFIG_NFSD_PNFS */
642
643static __be32
644nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
645 struct nfs4_sessionid *sessionid)
646{
647 __be32 *p;
648
649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
650 if (!p)
651 return nfserr_bad_xdr;
652 memcpy(sessionid->data, p, sizeof(sessionid->data));
653 return nfs_ok;
654}
655
656/* Defined in Appendix A of RFC 5531 */
657static __be32
658nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
659 struct nfsd4_cb_sec *cbs)
660{
661 u32 stamp, gidcount, uid, gid;
662 __be32 *p, status;
663
664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
665 return nfserr_bad_xdr;
666 /* machine name */
667 status = nfsd4_decode_ignored_string(argp, 255);
668 if (status)
669 return status;
670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
671 return nfserr_bad_xdr;
672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
673 return nfserr_bad_xdr;
674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
675 return nfserr_bad_xdr;
676 if (gidcount > 16)
677 return nfserr_bad_xdr;
678 p = xdr_inline_decode(argp->xdr, gidcount << 2);
679 if (!p)
680 return nfserr_bad_xdr;
681 if (cbs->flavor == (u32)(-1)) {
682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
683
684 kuid_t kuid = make_kuid(userns, uid);
685 kgid_t kgid = make_kgid(userns, gid);
686 if (uid_valid(kuid) && gid_valid(kgid)) {
687 cbs->uid = kuid;
688 cbs->gid = kgid;
689 cbs->flavor = RPC_AUTH_UNIX;
690 } else {
691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
692 }
693 }
694
695 return nfs_ok;
696}
697
698static __be32
699nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
700 struct nfsd4_cb_sec *cbs)
701{
702 __be32 status;
703 u32 service;
704
705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
706
707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
708 return nfserr_bad_xdr;
709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
710 return nfserr_bad_xdr;
711 /* gcbp_handle_from_server */
712 status = nfsd4_decode_ignored_string(argp, 0);
713 if (status)
714 return status;
715 /* gcbp_handle_from_client */
716 status = nfsd4_decode_ignored_string(argp, 0);
717 if (status)
718 return status;
719
720 return nfs_ok;
721}
722
723/* a counted array of callback_sec_parms4 items */
724static __be32
725nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
726{
727 u32 i, secflavor, nr_secflavs;
728 __be32 status;
729
730 /* callback_sec_params4 */
731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
732 return nfserr_bad_xdr;
733 if (nr_secflavs)
734 cbs->flavor = (u32)(-1);
735 else
736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
737 cbs->flavor = 0;
738
739 for (i = 0; i < nr_secflavs; ++i) {
740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
741 return nfserr_bad_xdr;
742 switch (secflavor) {
743 case RPC_AUTH_NULL:
744 /* void */
745 if (cbs->flavor == (u32)(-1))
746 cbs->flavor = RPC_AUTH_NULL;
747 break;
748 case RPC_AUTH_UNIX:
749 status = nfsd4_decode_authsys_parms(argp, cbs);
750 if (status)
751 return status;
752 break;
753 case RPC_AUTH_GSS:
754 status = nfsd4_decode_gss_cb_handles4(argp, cbs);
755 if (status)
756 return status;
757 break;
758 default:
759 return nfserr_inval;
760 }
761 }
762
763 return nfs_ok;
764}
765
766
767/*
768 * NFSv4 operation argument decoders
769 */
770
771static __be32
772nfsd4_decode_access(struct nfsd4_compoundargs *argp,
773 union nfsd4_op_u *u)
774{
775 struct nfsd4_access *access = &u->access;
776 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
777 return nfserr_bad_xdr;
778 return nfs_ok;
779}
780
781static __be32
782nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
783{
784 struct nfsd4_close *close = &u->close;
785 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
786 return nfserr_bad_xdr;
787 return nfsd4_decode_stateid4(argp, &close->cl_stateid);
788}
789
790
791static __be32
792nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
793{
794 struct nfsd4_commit *commit = &u->commit;
795 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
796 return nfserr_bad_xdr;
797 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
798 return nfserr_bad_xdr;
799 memset(&commit->co_verf, 0, sizeof(commit->co_verf));
800 return nfs_ok;
801}
802
803static __be32
804nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
805{
806 struct nfsd4_create *create = &u->create;
807 __be32 *p, status;
808
809 memset(create, 0, sizeof(*create));
810 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
811 return nfserr_bad_xdr;
812 switch (create->cr_type) {
813 case NF4LNK:
814 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
815 return nfserr_bad_xdr;
816 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
817 if (!p)
818 return nfserr_bad_xdr;
819 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
820 if (!create->cr_data)
821 return nfserr_jukebox;
822 break;
823 case NF4BLK:
824 case NF4CHR:
825 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
826 return nfserr_bad_xdr;
827 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
828 return nfserr_bad_xdr;
829 break;
830 case NF4SOCK:
831 case NF4FIFO:
832 case NF4DIR:
833 default:
834 break;
835 }
836 status = nfsd4_decode_component4(argp, &create->cr_name,
837 &create->cr_namelen);
838 if (status)
839 return status;
840 status = nfsd4_decode_fattr4(argp, create->cr_bmval,
841 ARRAY_SIZE(create->cr_bmval),
842 &create->cr_iattr, &create->cr_acl,
843 &create->cr_label, &create->cr_umask);
844 if (status)
845 return status;
846
847 return nfs_ok;
848}
849
850static inline __be32
851nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
852{
853 struct nfsd4_delegreturn *dr = &u->delegreturn;
854 return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
855}
856
857static inline __be32
858nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
859{
860 struct nfsd4_getattr *getattr = &u->getattr;
861 memset(getattr, 0, sizeof(*getattr));
862 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
863 ARRAY_SIZE(getattr->ga_bmval));
864}
865
866static __be32
867nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
868{
869 struct nfsd4_link *link = &u->link;
870 memset(link, 0, sizeof(*link));
871 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
872}
873
874static __be32
875nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
876 struct nfsd4_lock *lock)
877{
878 __be32 status;
879
880 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
881 return nfserr_bad_xdr;
882 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
883 if (status)
884 return status;
885 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
886 return nfserr_bad_xdr;
887 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
888 &lock->lk_new_owner);
889}
890
891static __be32
892nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
893 struct nfsd4_lock *lock)
894{
895 __be32 status;
896
897 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
898 if (status)
899 return status;
900 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
901 return nfserr_bad_xdr;
902
903 return nfs_ok;
904}
905
906static __be32
907nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
908{
909 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
910 return nfserr_bad_xdr;
911 if (lock->lk_is_new)
912 return nfsd4_decode_open_to_lock_owner4(argp, lock);
913 return nfsd4_decode_exist_lock_owner4(argp, lock);
914}
915
916static __be32
917nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
918{
919 struct nfsd4_lock *lock = &u->lock;
920 memset(lock, 0, sizeof(*lock));
921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
922 return nfserr_bad_xdr;
923 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
924 return nfserr_bad_xdr;
925 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
926 return nfserr_bad_xdr;
927 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
928 return nfserr_bad_xdr;
929 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
930 return nfserr_bad_xdr;
931 return nfsd4_decode_locker4(argp, lock);
932}
933
934static __be32
935nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
936{
937 struct nfsd4_lockt *lockt = &u->lockt;
938 memset(lockt, 0, sizeof(*lockt));
939 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
940 return nfserr_bad_xdr;
941 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
942 return nfserr_bad_xdr;
943 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
944 return nfserr_bad_xdr;
945 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
946 return nfserr_bad_xdr;
947 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
948 &lockt->lt_owner);
949}
950
951static __be32
952nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
953{
954 struct nfsd4_locku *locku = &u->locku;
955 __be32 status;
956
957 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
958 return nfserr_bad_xdr;
959 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
960 return nfserr_bad_xdr;
961 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
962 return nfserr_bad_xdr;
963 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
964 if (status)
965 return status;
966 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
967 return nfserr_bad_xdr;
968 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
969 return nfserr_bad_xdr;
970
971 return nfs_ok;
972}
973
974static __be32
975nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
976{
977 struct nfsd4_lookup *lookup = &u->lookup;
978 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
979}
980
981static __be32
982nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
983{
984 __be32 status;
985
986 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
987 return nfserr_bad_xdr;
988 switch (open->op_createmode) {
989 case NFS4_CREATE_UNCHECKED:
990 case NFS4_CREATE_GUARDED:
991 status = nfsd4_decode_fattr4(argp, open->op_bmval,
992 ARRAY_SIZE(open->op_bmval),
993 &open->op_iattr, &open->op_acl,
994 &open->op_label, &open->op_umask);
995 if (status)
996 return status;
997 break;
998 case NFS4_CREATE_EXCLUSIVE:
999 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1000 if (status)
1001 return status;
1002 break;
1003 case NFS4_CREATE_EXCLUSIVE4_1:
1004 if (argp->minorversion < 1)
1005 return nfserr_bad_xdr;
1006 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1007 if (status)
1008 return status;
1009 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1010 ARRAY_SIZE(open->op_bmval),
1011 &open->op_iattr, &open->op_acl,
1012 &open->op_label, &open->op_umask);
1013 if (status)
1014 return status;
1015 break;
1016 default:
1017 return nfserr_bad_xdr;
1018 }
1019
1020 return nfs_ok;
1021}
1022
1023static __be32
1024nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025{
1026 __be32 status;
1027
1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1029 return nfserr_bad_xdr;
1030 switch (open->op_create) {
1031 case NFS4_OPEN_NOCREATE:
1032 break;
1033 case NFS4_OPEN_CREATE:
1034 status = nfsd4_decode_createhow4(argp, open);
1035 if (status)
1036 return status;
1037 break;
1038 default:
1039 return nfserr_bad_xdr;
1040 }
1041
1042 return nfs_ok;
1043}
1044
1045static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1046{
1047 u32 w;
1048
1049 if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1050 return nfserr_bad_xdr;
1051 *share_access = w & NFS4_SHARE_ACCESS_MASK;
1052 *deleg_want = w & NFS4_SHARE_WANT_MASK;
1053 if (deleg_when)
1054 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
1056 switch (w & NFS4_SHARE_ACCESS_MASK) {
1057 case NFS4_SHARE_ACCESS_READ:
1058 case NFS4_SHARE_ACCESS_WRITE:
1059 case NFS4_SHARE_ACCESS_BOTH:
1060 break;
1061 default:
1062 return nfserr_bad_xdr;
1063 }
1064 w &= ~NFS4_SHARE_ACCESS_MASK;
1065 if (!w)
1066 return nfs_ok;
1067 if (!argp->minorversion)
1068 return nfserr_bad_xdr;
1069 switch (w & NFS4_SHARE_WANT_MASK) {
1070 case NFS4_SHARE_WANT_NO_PREFERENCE:
1071 case NFS4_SHARE_WANT_READ_DELEG:
1072 case NFS4_SHARE_WANT_WRITE_DELEG:
1073 case NFS4_SHARE_WANT_ANY_DELEG:
1074 case NFS4_SHARE_WANT_NO_DELEG:
1075 case NFS4_SHARE_WANT_CANCEL:
1076 break;
1077 default:
1078 return nfserr_bad_xdr;
1079 }
1080 w &= ~NFS4_SHARE_WANT_MASK;
1081 if (!w)
1082 return nfs_ok;
1083
1084 if (!deleg_when) /* open_downgrade */
1085 return nfserr_inval;
1086 switch (w) {
1087 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1089 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1091 return nfs_ok;
1092 }
1093 return nfserr_bad_xdr;
1094}
1095
1096static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097{
1098 if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1099 return nfserr_bad_xdr;
1100 /* Note: unlike access bits, deny bits may be zero. */
1101 if (*x & ~NFS4_SHARE_DENY_BOTH)
1102 return nfserr_bad_xdr;
1103
1104 return nfs_ok;
1105}
1106
1107static __be32
1108nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109 struct nfsd4_open *open)
1110{
1111 __be32 status;
1112
1113 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1114 return nfserr_bad_xdr;
1115 switch (open->op_claim_type) {
1116 case NFS4_OPEN_CLAIM_NULL:
1117 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118 status = nfsd4_decode_component4(argp, &open->op_fname,
1119 &open->op_fnamelen);
1120 if (status)
1121 return status;
1122 break;
1123 case NFS4_OPEN_CLAIM_PREVIOUS:
1124 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1125 return nfserr_bad_xdr;
1126 break;
1127 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1129 if (status)
1130 return status;
1131 status = nfsd4_decode_component4(argp, &open->op_fname,
1132 &open->op_fnamelen);
1133 if (status)
1134 return status;
1135 break;
1136 case NFS4_OPEN_CLAIM_FH:
1137 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138 if (argp->minorversion < 1)
1139 return nfserr_bad_xdr;
1140 /* void */
1141 break;
1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143 if (argp->minorversion < 1)
1144 return nfserr_bad_xdr;
1145 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1146 if (status)
1147 return status;
1148 break;
1149 default:
1150 return nfserr_bad_xdr;
1151 }
1152
1153 return nfs_ok;
1154}
1155
1156static __be32
1157nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1158{
1159 struct nfsd4_open *open = &u->open;
1160 __be32 status;
1161 u32 dummy;
1162
1163 memset(open, 0, sizeof(*open));
1164
1165 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1166 return nfserr_bad_xdr;
1167 /* deleg_want is ignored */
1168 status = nfsd4_decode_share_access(argp, &open->op_share_access,
1169 &open->op_deleg_want, &dummy);
1170 if (status)
1171 return status;
1172 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1173 if (status)
1174 return status;
1175 status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1176 &open->op_owner);
1177 if (status)
1178 return status;
1179 status = nfsd4_decode_openflag4(argp, open);
1180 if (status)
1181 return status;
1182 return nfsd4_decode_open_claim4(argp, open);
1183}
1184
1185static __be32
1186nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187 union nfsd4_op_u *u)
1188{
1189 struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1190 __be32 status;
1191
1192 if (argp->minorversion >= 1)
1193 return nfserr_notsupp;
1194
1195 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1196 if (status)
1197 return status;
1198 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1199 return nfserr_bad_xdr;
1200
1201 memset(&open_conf->oc_resp_stateid, 0,
1202 sizeof(open_conf->oc_resp_stateid));
1203 return nfs_ok;
1204}
1205
1206static __be32
1207nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208 union nfsd4_op_u *u)
1209{
1210 struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1211 __be32 status;
1212
1213 memset(open_down, 0, sizeof(*open_down));
1214 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1215 if (status)
1216 return status;
1217 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1218 return nfserr_bad_xdr;
1219 /* deleg_want is ignored */
1220 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1221 &open_down->od_deleg_want, NULL);
1222 if (status)
1223 return status;
1224 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1225}
1226
1227static __be32
1228nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1229{
1230 struct nfsd4_putfh *putfh = &u->putfh;
1231 __be32 *p;
1232
1233 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1234 return nfserr_bad_xdr;
1235 if (putfh->pf_fhlen > NFS4_FHSIZE)
1236 return nfserr_bad_xdr;
1237 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1238 if (!p)
1239 return nfserr_bad_xdr;
1240 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1241 if (!putfh->pf_fhval)
1242 return nfserr_jukebox;
1243
1244 putfh->no_verify = false;
1245 return nfs_ok;
1246}
1247
1248static __be32
1249nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
1250{
1251 if (argp->minorversion == 0)
1252 return nfs_ok;
1253 return nfserr_notsupp;
1254}
1255
1256static __be32
1257nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1258{
1259 struct nfsd4_read *read = &u->read;
1260 __be32 status;
1261
1262 memset(read, 0, sizeof(*read));
1263 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1264 if (status)
1265 return status;
1266 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1267 return nfserr_bad_xdr;
1268 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1269 return nfserr_bad_xdr;
1270
1271 return nfs_ok;
1272}
1273
1274static __be32
1275nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1276{
1277 struct nfsd4_readdir *readdir = &u->readdir;
1278 __be32 status;
1279
1280 memset(readdir, 0, sizeof(*readdir));
1281 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1282 return nfserr_bad_xdr;
1283 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1284 if (status)
1285 return status;
1286 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1287 return nfserr_bad_xdr;
1288 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1289 return nfserr_bad_xdr;
1290 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1291 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292 return nfserr_bad_xdr;
1293
1294 return nfs_ok;
1295}
1296
1297static __be32
1298nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299{
1300 struct nfsd4_remove *remove = &u->remove;
1301 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1302 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1303}
1304
1305static __be32
1306nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1307{
1308 struct nfsd4_rename *rename = &u->rename;
1309 __be32 status;
1310
1311 memset(rename, 0, sizeof(*rename));
1312 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1313 if (status)
1314 return status;
1315 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1316}
1317
1318static __be32
1319nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320{
1321 clientid_t *clientid = &u->renew;
1322 return nfsd4_decode_clientid4(argp, clientid);
1323}
1324
1325static __be32
1326nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1327 union nfsd4_op_u *u)
1328{
1329 struct nfsd4_secinfo *secinfo = &u->secinfo;
1330 secinfo->si_exp = NULL;
1331 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1332}
1333
1334static __be32
1335nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1336{
1337 struct nfsd4_setattr *setattr = &u->setattr;
1338 __be32 status;
1339
1340 memset(setattr, 0, sizeof(*setattr));
1341 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1342 if (status)
1343 return status;
1344 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1345 ARRAY_SIZE(setattr->sa_bmval),
1346 &setattr->sa_iattr, &setattr->sa_acl,
1347 &setattr->sa_label, NULL);
1348}
1349
1350static __be32
1351nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1352{
1353 struct nfsd4_setclientid *setclientid = &u->setclientid;
1354 __be32 *p, status;
1355
1356 memset(setclientid, 0, sizeof(*setclientid));
1357
1358 if (argp->minorversion >= 1)
1359 return nfserr_notsupp;
1360
1361 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1362 if (status)
1363 return status;
1364 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1365 if (status)
1366 return status;
1367 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1368 return nfserr_bad_xdr;
1369 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1370 return nfserr_bad_xdr;
1371 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1372 if (!p)
1373 return nfserr_bad_xdr;
1374 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1375 setclientid->se_callback_netid_len);
1376 if (!setclientid->se_callback_netid_val)
1377 return nfserr_jukebox;
1378
1379 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1380 return nfserr_bad_xdr;
1381 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1382 if (!p)
1383 return nfserr_bad_xdr;
1384 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1385 setclientid->se_callback_addr_len);
1386 if (!setclientid->se_callback_addr_val)
1387 return nfserr_jukebox;
1388 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1389 return nfserr_bad_xdr;
1390
1391 return nfs_ok;
1392}
1393
1394static __be32
1395nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396 union nfsd4_op_u *u)
1397{
1398 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1399 __be32 status;
1400
1401 if (argp->minorversion >= 1)
1402 return nfserr_notsupp;
1403
1404 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1405 if (status)
1406 return status;
1407 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1408}
1409
1410/* Also used for NVERIFY */
1411static __be32
1412nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1413{
1414 struct nfsd4_verify *verify = &u->verify;
1415 __be32 *p, status;
1416
1417 memset(verify, 0, sizeof(*verify));
1418
1419 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1420 ARRAY_SIZE(verify->ve_bmval));
1421 if (status)
1422 return status;
1423
1424 /* For convenience's sake, we compare raw xdr'd attributes in
1425 * nfsd4_proc_verify */
1426
1427 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1428 return nfserr_bad_xdr;
1429 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1430 if (!p)
1431 return nfserr_bad_xdr;
1432 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1433 if (!verify->ve_attrval)
1434 return nfserr_jukebox;
1435
1436 return nfs_ok;
1437}
1438
1439static __be32
1440nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1441{
1442 struct nfsd4_write *write = &u->write;
1443 __be32 status;
1444
1445 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1446 if (status)
1447 return status;
1448 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1449 return nfserr_bad_xdr;
1450 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1451 return nfserr_bad_xdr;
1452 if (write->wr_stable_how > NFS_FILE_SYNC)
1453 return nfserr_bad_xdr;
1454 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1455 return nfserr_bad_xdr;
1456 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1457 return nfserr_bad_xdr;
1458
1459 write->wr_bytes_written = 0;
1460 write->wr_how_written = 0;
1461 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1462 return nfs_ok;
1463}
1464
1465static __be32
1466nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467 union nfsd4_op_u *u)
1468{
1469 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1470 __be32 status;
1471
1472 if (argp->minorversion >= 1)
1473 return nfserr_notsupp;
1474
1475 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1476 &rlockowner->rl_owner);
1477 if (status)
1478 return status;
1479
1480 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1481 return nfserr_inval;
1482
1483 return nfs_ok;
1484}
1485
1486static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487 union nfsd4_op_u *u)
1488{
1489 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1490 memset(bc, 0, sizeof(*bc));
1491 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1492 return nfserr_bad_xdr;
1493 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1494}
1495
1496static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497 union nfsd4_op_u *u)
1498{
1499 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1500 u32 use_conn_in_rdma_mode;
1501 __be32 status;
1502
1503 memset(bcts, 0, sizeof(*bcts));
1504 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1505 if (status)
1506 return status;
1507 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1508 return nfserr_bad_xdr;
1509 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1510 return nfserr_bad_xdr;
1511
1512 return nfs_ok;
1513}
1514
1515static __be32
1516nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517 struct nfsd4_exchange_id *exid)
1518{
1519 __be32 status;
1520
1521 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1522 ARRAY_SIZE(exid->spo_must_enforce));
1523 if (status)
1524 return nfserr_bad_xdr;
1525 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1526 ARRAY_SIZE(exid->spo_must_allow));
1527 if (status)
1528 return nfserr_bad_xdr;
1529
1530 return nfs_ok;
1531}
1532
1533/*
1534 * This implementation currently does not support SP4_SSV.
1535 * This decoder simply skips over these arguments.
1536 */
1537static noinline __be32
1538nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539 struct nfsd4_exchange_id *exid)
1540{
1541 u32 count, window, num_gss_handles;
1542 __be32 status;
1543
1544 /* ssp_ops */
1545 status = nfsd4_decode_state_protect_ops(argp, exid);
1546 if (status)
1547 return status;
1548
1549 /* ssp_hash_algs<> */
1550 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1551 return nfserr_bad_xdr;
1552 while (count--) {
1553 status = nfsd4_decode_ignored_string(argp, 0);
1554 if (status)
1555 return status;
1556 }
1557
1558 /* ssp_encr_algs<> */
1559 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1560 return nfserr_bad_xdr;
1561 while (count--) {
1562 status = nfsd4_decode_ignored_string(argp, 0);
1563 if (status)
1564 return status;
1565 }
1566
1567 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1568 return nfserr_bad_xdr;
1569 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1570 return nfserr_bad_xdr;
1571
1572 return nfs_ok;
1573}
1574
1575static __be32
1576nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577 struct nfsd4_exchange_id *exid)
1578{
1579 __be32 status;
1580
1581 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1582 return nfserr_bad_xdr;
1583 switch (exid->spa_how) {
1584 case SP4_NONE:
1585 break;
1586 case SP4_MACH_CRED:
1587 status = nfsd4_decode_state_protect_ops(argp, exid);
1588 if (status)
1589 return status;
1590 break;
1591 case SP4_SSV:
1592 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1593 if (status)
1594 return status;
1595 break;
1596 default:
1597 return nfserr_bad_xdr;
1598 }
1599
1600 return nfs_ok;
1601}
1602
1603static __be32
1604nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605 struct nfsd4_exchange_id *exid)
1606{
1607 __be32 status;
1608 u32 count;
1609
1610 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1611 return nfserr_bad_xdr;
1612 switch (count) {
1613 case 0:
1614 break;
1615 case 1:
1616 /* Note that RFC 8881 places no length limit on
1617 * nii_domain, but this implementation permits no
1618 * more than NFS4_OPAQUE_LIMIT bytes */
1619 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1620 if (status)
1621 return status;
1622 /* Note that RFC 8881 places no length limit on
1623 * nii_name, but this implementation permits no
1624 * more than NFS4_OPAQUE_LIMIT bytes */
1625 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1626 if (status)
1627 return status;
1628 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1629 if (status)
1630 return status;
1631 break;
1632 default:
1633 return nfserr_bad_xdr;
1634 }
1635
1636 return nfs_ok;
1637}
1638
1639static __be32
1640nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1641 union nfsd4_op_u *u)
1642{
1643 struct nfsd4_exchange_id *exid = &u->exchange_id;
1644 __be32 status;
1645
1646 memset(exid, 0, sizeof(*exid));
1647 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1648 if (status)
1649 return status;
1650 status = nfsd4_decode_opaque(argp, &exid->clname);
1651 if (status)
1652 return status;
1653 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1654 return nfserr_bad_xdr;
1655 status = nfsd4_decode_state_protect4_a(argp, exid);
1656 if (status)
1657 return status;
1658 return nfsd4_decode_nfs_impl_id4(argp, exid);
1659}
1660
1661static __be32
1662nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663 struct nfsd4_channel_attrs *ca)
1664{
1665 __be32 *p;
1666
1667 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1668 if (!p)
1669 return nfserr_bad_xdr;
1670
1671 /* headerpadsz is ignored */
1672 p++;
1673 ca->maxreq_sz = be32_to_cpup(p++);
1674 ca->maxresp_sz = be32_to_cpup(p++);
1675 ca->maxresp_cached = be32_to_cpup(p++);
1676 ca->maxops = be32_to_cpup(p++);
1677 ca->maxreqs = be32_to_cpup(p++);
1678 ca->nr_rdma_attrs = be32_to_cpup(p);
1679 switch (ca->nr_rdma_attrs) {
1680 case 0:
1681 break;
1682 case 1:
1683 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1684 return nfserr_bad_xdr;
1685 break;
1686 default:
1687 return nfserr_bad_xdr;
1688 }
1689
1690 return nfs_ok;
1691}
1692
1693static __be32
1694nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1695 union nfsd4_op_u *u)
1696{
1697 struct nfsd4_create_session *sess = &u->create_session;
1698 __be32 status;
1699
1700 memset(sess, 0, sizeof(*sess));
1701 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1702 if (status)
1703 return status;
1704 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1705 return nfserr_bad_xdr;
1706 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1707 return nfserr_bad_xdr;
1708 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1709 if (status)
1710 return status;
1711 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1712 if (status)
1713 return status;
1714 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1715 return nfserr_bad_xdr;
1716 return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1717}
1718
1719static __be32
1720nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1721 union nfsd4_op_u *u)
1722{
1723 struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1724 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1725}
1726
1727static __be32
1728nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1729 union nfsd4_op_u *u)
1730{
1731 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1732 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1733}
1734
1735#ifdef CONFIG_NFSD_PNFS
1736static __be32
1737nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1738 union nfsd4_op_u *u)
1739{
1740 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1741 __be32 status;
1742
1743 memset(gdev, 0, sizeof(*gdev));
1744 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1745 if (status)
1746 return status;
1747 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1748 return nfserr_bad_xdr;
1749 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1750 return nfserr_bad_xdr;
1751 if (xdr_stream_decode_uint32_array(argp->xdr,
1752 &gdev->gd_notify_types, 1) < 0)
1753 return nfserr_bad_xdr;
1754
1755 return nfs_ok;
1756}
1757
1758static __be32
1759nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1760 union nfsd4_op_u *u)
1761{
1762 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1763 __be32 *p, status;
1764
1765 memset(lcp, 0, sizeof(*lcp));
1766 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1767 return nfserr_bad_xdr;
1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1769 return nfserr_bad_xdr;
1770 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1771 return nfserr_bad_xdr;
1772 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1773 if (status)
1774 return status;
1775 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1776 return nfserr_bad_xdr;
1777 if (lcp->lc_newoffset) {
1778 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1779 return nfserr_bad_xdr;
1780 } else
1781 lcp->lc_last_wr = 0;
1782 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1783 if (!p)
1784 return nfserr_bad_xdr;
1785 if (xdr_item_is_present(p)) {
1786 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1787 if (status)
1788 return status;
1789 } else {
1790 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791 }
1792 return nfsd4_decode_layoutupdate4(argp, lcp);
1793}
1794
1795static __be32
1796nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1797 union nfsd4_op_u *u)
1798{
1799 struct nfsd4_layoutget *lgp = &u->layoutget;
1800 __be32 status;
1801
1802 memset(lgp, 0, sizeof(*lgp));
1803 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1804 return nfserr_bad_xdr;
1805 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1806 return nfserr_bad_xdr;
1807 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1808 return nfserr_bad_xdr;
1809 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1810 return nfserr_bad_xdr;
1811 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1812 return nfserr_bad_xdr;
1813 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1814 return nfserr_bad_xdr;
1815 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1816 if (status)
1817 return status;
1818 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1819 return nfserr_bad_xdr;
1820
1821 return nfs_ok;
1822}
1823
1824static __be32
1825nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1826 union nfsd4_op_u *u)
1827{
1828 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1829 memset(lrp, 0, sizeof(*lrp));
1830 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1831 return nfserr_bad_xdr;
1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1833 return nfserr_bad_xdr;
1834 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1835 return nfserr_bad_xdr;
1836 return nfsd4_decode_layoutreturn4(argp, lrp);
1837}
1838#endif /* CONFIG_NFSD_PNFS */
1839
1840static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1841 union nfsd4_op_u *u)
1842{
1843 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1844 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1845 return nfserr_bad_xdr;
1846
1847 sin->sin_exp = NULL;
1848 return nfs_ok;
1849}
1850
1851static __be32
1852nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1853 union nfsd4_op_u *u)
1854{
1855 struct nfsd4_sequence *seq = &u->sequence;
1856 __be32 *p, status;
1857
1858 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1859 if (status)
1860 return status;
1861 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1862 if (!p)
1863 return nfserr_bad_xdr;
1864 seq->seqid = be32_to_cpup(p++);
1865 seq->slotid = be32_to_cpup(p++);
1866 seq->maxslots = be32_to_cpup(p++);
1867 seq->cachethis = be32_to_cpup(p);
1868
1869 seq->status_flags = 0;
1870 return nfs_ok;
1871}
1872
1873static __be32
1874nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875 union nfsd4_op_u *u)
1876{
1877 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1878 struct nfsd4_test_stateid_id *stateid;
1879 __be32 status;
1880 u32 i;
1881
1882 memset(test_stateid, 0, sizeof(*test_stateid));
1883 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1884 return nfserr_bad_xdr;
1885
1886 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1887 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1889 if (!stateid)
1890 return nfserr_jukebox;
1891 INIT_LIST_HEAD(&stateid->ts_id_list);
1892 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1893 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1894 if (status)
1895 return status;
1896 }
1897
1898 return nfs_ok;
1899}
1900
1901static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1902 union nfsd4_op_u *u)
1903{
1904 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1905 return nfsd4_decode_clientid4(argp, &dc->clientid);
1906}
1907
1908static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1909 union nfsd4_op_u *u)
1910{
1911 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1912 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1913 return nfserr_bad_xdr;
1914 return nfs_ok;
1915}
1916
1917static __be32
1918nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1919 union nfsd4_op_u *u)
1920{
1921 struct nfsd4_fallocate *fallocate = &u->allocate;
1922 __be32 status;
1923
1924 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1925 if (status)
1926 return status;
1927 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1928 return nfserr_bad_xdr;
1929 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1930 return nfserr_bad_xdr;
1931
1932 return nfs_ok;
1933}
1934
1935static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936 struct nl4_server *ns)
1937{
1938 struct nfs42_netaddr *naddr;
1939 __be32 *p;
1940
1941 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1942 return nfserr_bad_xdr;
1943
1944 /* currently support for 1 inter-server source server */
1945 switch (ns->nl4_type) {
1946 case NL4_NETADDR:
1947 naddr = &ns->u.nl4_addr;
1948
1949 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1950 return nfserr_bad_xdr;
1951 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1952 return nfserr_bad_xdr;
1953
1954 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1955 if (!p)
1956 return nfserr_bad_xdr;
1957 memcpy(naddr->netid, p, naddr->netid_len);
1958
1959 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1960 return nfserr_bad_xdr;
1961 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1962 return nfserr_bad_xdr;
1963
1964 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1965 if (!p)
1966 return nfserr_bad_xdr;
1967 memcpy(naddr->addr, p, naddr->addr_len);
1968 break;
1969 default:
1970 return nfserr_bad_xdr;
1971 }
1972
1973 return nfs_ok;
1974}
1975
1976static __be32
1977nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1978{
1979 struct nfsd4_copy *copy = &u->copy;
1980 u32 consecutive, i, count, sync;
1981 struct nl4_server *ns_dummy;
1982 __be32 status;
1983
1984 memset(copy, 0, sizeof(*copy));
1985 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid);
1986 if (status)
1987 return status;
1988 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid);
1989 if (status)
1990 return status;
1991 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0)
1992 return nfserr_bad_xdr;
1993 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0)
1994 return nfserr_bad_xdr;
1995 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0)
1996 return nfserr_bad_xdr;
1997 /* ca_consecutive: we always do consecutive copies */
1998 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1999 return nfserr_bad_xdr;
2000 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2001 return nfserr_bad_xdr;
2002 nfsd4_copy_set_sync(copy, sync);
2003
2004 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2005 return nfserr_bad_xdr;
2006 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2007 if (copy->cp_src == NULL)
2008 return nfserr_jukebox;
2009 if (count == 0) { /* intra-server copy */
2010 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags);
2011 return nfs_ok;
2012 }
2013
2014 /* decode all the supplied server addresses but use only the first */
2015 status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2016 if (status)
2017 return status;
2018
2019 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2020 if (ns_dummy == NULL)
2021 return nfserr_jukebox;
2022 for (i = 0; i < count - 1; i++) {
2023 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2024 if (status) {
2025 kfree(ns_dummy);
2026 return status;
2027 }
2028 }
2029 kfree(ns_dummy);
2030
2031 return nfs_ok;
2032}
2033
2034static __be32
2035nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2036 union nfsd4_op_u *u)
2037{
2038 struct nfsd4_copy_notify *cn = &u->copy_notify;
2039 __be32 status;
2040
2041 memset(cn, 0, sizeof(*cn));
2042 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2043 if (cn->cpn_src == NULL)
2044 return nfserr_jukebox;
2045 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2046 if (cn->cpn_dst == NULL)
2047 return nfserr_jukebox;
2048
2049 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2050 if (status)
2051 return status;
2052 return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2053}
2054
2055static __be32
2056nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2057 union nfsd4_op_u *u)
2058{
2059 struct nfsd4_offload_status *os = &u->offload_status;
2060 os->count = 0;
2061 os->status = 0;
2062 return nfsd4_decode_stateid4(argp, &os->stateid);
2063}
2064
2065static __be32
2066nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2067{
2068 struct nfsd4_seek *seek = &u->seek;
2069 __be32 status;
2070
2071 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2072 if (status)
2073 return status;
2074 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2075 return nfserr_bad_xdr;
2076 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2077 return nfserr_bad_xdr;
2078
2079 seek->seek_eof = 0;
2080 seek->seek_pos = 0;
2081 return nfs_ok;
2082}
2083
2084static __be32
2085nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2086{
2087 struct nfsd4_clone *clone = &u->clone;
2088 __be32 status;
2089
2090 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2091 if (status)
2092 return status;
2093 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2094 if (status)
2095 return status;
2096 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2097 return nfserr_bad_xdr;
2098 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2099 return nfserr_bad_xdr;
2100 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2101 return nfserr_bad_xdr;
2102
2103 return nfs_ok;
2104}
2105
2106/*
2107 * XDR data that is more than PAGE_SIZE in size is normally part of a
2108 * read or write. However, the size of extended attributes is limited
2109 * by the maximum request size, and then further limited by the underlying
2110 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2112 * and we're not dealing with contiguous pages, we need to do some copying.
2113 */
2114
2115/*
2116 * Decode data into buffer.
2117 */
2118static __be32
2119nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120 char **bufp, u32 buflen)
2121{
2122 struct page **pages = xdr->pages;
2123 struct kvec *head = xdr->head;
2124 char *tmp, *dp;
2125 u32 len;
2126
2127 if (buflen <= head->iov_len) {
2128 /*
2129 * We're in luck, the head has enough space. Just return
2130 * the head, no need for copying.
2131 */
2132 *bufp = head->iov_base;
2133 return 0;
2134 }
2135
2136 tmp = svcxdr_tmpalloc(argp, buflen);
2137 if (tmp == NULL)
2138 return nfserr_jukebox;
2139
2140 dp = tmp;
2141 memcpy(dp, head->iov_base, head->iov_len);
2142 buflen -= head->iov_len;
2143 dp += head->iov_len;
2144
2145 while (buflen > 0) {
2146 len = min_t(u32, buflen, PAGE_SIZE);
2147 memcpy(dp, page_address(*pages), len);
2148
2149 buflen -= len;
2150 dp += len;
2151 pages++;
2152 }
2153
2154 *bufp = tmp;
2155 return 0;
2156}
2157
2158/*
2159 * Get a user extended attribute name from the XDR buffer.
2160 * It will not have the "user." prefix, so prepend it.
2161 * Lastly, check for nul characters in the name.
2162 */
2163static __be32
2164nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165{
2166 char *name, *sp, *dp;
2167 u32 namelen, cnt;
2168 __be32 *p;
2169
2170 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2171 return nfserr_bad_xdr;
2172 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173 return nfserr_nametoolong;
2174 if (namelen == 0)
2175 return nfserr_bad_xdr;
2176 p = xdr_inline_decode(argp->xdr, namelen);
2177 if (!p)
2178 return nfserr_bad_xdr;
2179 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2180 if (!name)
2181 return nfserr_jukebox;
2182 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184 /*
2185 * Copy the extended attribute name over while checking for 0
2186 * characters.
2187 */
2188 sp = (char *)p;
2189 dp = name + XATTR_USER_PREFIX_LEN;
2190 cnt = namelen;
2191
2192 while (cnt-- > 0) {
2193 if (*sp == '\0')
2194 return nfserr_bad_xdr;
2195 *dp++ = *sp++;
2196 }
2197 *dp = '\0';
2198
2199 *namep = name;
2200
2201 return nfs_ok;
2202}
2203
2204/*
2205 * A GETXATTR op request comes without a length specifier. We just set the
2206 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2208 * check it against getxa_len, and allocate + return the value.
2209 */
2210static __be32
2211nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2212 union nfsd4_op_u *u)
2213{
2214 struct nfsd4_getxattr *getxattr = &u->getxattr;
2215 __be32 status;
2216 u32 maxcount;
2217
2218 memset(getxattr, 0, sizeof(*getxattr));
2219 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2220 if (status)
2221 return status;
2222
2223 maxcount = svc_max_payload(argp->rqstp);
2224 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226 getxattr->getxa_len = maxcount;
2227 return nfs_ok;
2228}
2229
2230static __be32
2231nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2232 union nfsd4_op_u *u)
2233{
2234 struct nfsd4_setxattr *setxattr = &u->setxattr;
2235 u32 flags, maxcount, size;
2236 __be32 status;
2237
2238 memset(setxattr, 0, sizeof(*setxattr));
2239
2240 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2241 return nfserr_bad_xdr;
2242
2243 if (flags > SETXATTR4_REPLACE)
2244 return nfserr_inval;
2245 setxattr->setxa_flags = flags;
2246
2247 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2248 if (status)
2249 return status;
2250
2251 maxcount = svc_max_payload(argp->rqstp);
2252 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
2254 if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2255 return nfserr_bad_xdr;
2256 if (size > maxcount)
2257 return nfserr_xattr2big;
2258
2259 setxattr->setxa_len = size;
2260 if (size > 0) {
2261 struct xdr_buf payload;
2262
2263 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2264 return nfserr_bad_xdr;
2265 status = nfsd4_vbuf_from_vector(argp, &payload,
2266 &setxattr->setxa_buf, size);
2267 }
2268
2269 return nfs_ok;
2270}
2271
2272static __be32
2273nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2274 union nfsd4_op_u *u)
2275{
2276 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2277 u32 maxcount;
2278
2279 memset(listxattrs, 0, sizeof(*listxattrs));
2280
2281 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2282 return nfserr_bad_xdr;
2283
2284 /*
2285 * If the cookie is too large to have even one user.x attribute
2286 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2287 */
2288 if (listxattrs->lsxa_cookie >=
2289 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290 return nfserr_badcookie;
2291
2292 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2293 return nfserr_bad_xdr;
2294 if (maxcount < 8)
2295 /* Always need at least 2 words (length and one character) */
2296 return nfserr_inval;
2297
2298 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299 listxattrs->lsxa_maxcount = maxcount;
2300
2301 return nfs_ok;
2302}
2303
2304static __be32
2305nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2306 union nfsd4_op_u *u)
2307{
2308 struct nfsd4_removexattr *removexattr = &u->removexattr;
2309 memset(removexattr, 0, sizeof(*removexattr));
2310 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2311}
2312
2313static __be32
2314nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2315{
2316 return nfs_ok;
2317}
2318
2319static __be32
2320nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2321{
2322 return nfserr_notsupp;
2323}
2324
2325typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2326
2327static const nfsd4_dec nfsd4_dec_ops[] = {
2328 [OP_ACCESS] = nfsd4_decode_access,
2329 [OP_CLOSE] = nfsd4_decode_close,
2330 [OP_COMMIT] = nfsd4_decode_commit,
2331 [OP_CREATE] = nfsd4_decode_create,
2332 [OP_DELEGPURGE] = nfsd4_decode_notsupp,
2333 [OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2334 [OP_GETATTR] = nfsd4_decode_getattr,
2335 [OP_GETFH] = nfsd4_decode_noop,
2336 [OP_LINK] = nfsd4_decode_link,
2337 [OP_LOCK] = nfsd4_decode_lock,
2338 [OP_LOCKT] = nfsd4_decode_lockt,
2339 [OP_LOCKU] = nfsd4_decode_locku,
2340 [OP_LOOKUP] = nfsd4_decode_lookup,
2341 [OP_LOOKUPP] = nfsd4_decode_noop,
2342 [OP_NVERIFY] = nfsd4_decode_verify,
2343 [OP_OPEN] = nfsd4_decode_open,
2344 [OP_OPENATTR] = nfsd4_decode_notsupp,
2345 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2346 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2347 [OP_PUTFH] = nfsd4_decode_putfh,
2348 [OP_PUTPUBFH] = nfsd4_decode_putpubfh,
2349 [OP_PUTROOTFH] = nfsd4_decode_noop,
2350 [OP_READ] = nfsd4_decode_read,
2351 [OP_READDIR] = nfsd4_decode_readdir,
2352 [OP_READLINK] = nfsd4_decode_noop,
2353 [OP_REMOVE] = nfsd4_decode_remove,
2354 [OP_RENAME] = nfsd4_decode_rename,
2355 [OP_RENEW] = nfsd4_decode_renew,
2356 [OP_RESTOREFH] = nfsd4_decode_noop,
2357 [OP_SAVEFH] = nfsd4_decode_noop,
2358 [OP_SECINFO] = nfsd4_decode_secinfo,
2359 [OP_SETATTR] = nfsd4_decode_setattr,
2360 [OP_SETCLIENTID] = nfsd4_decode_setclientid,
2361 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362 [OP_VERIFY] = nfsd4_decode_verify,
2363 [OP_WRITE] = nfsd4_decode_write,
2364 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2365
2366 /* new operations for NFSv4.1 */
2367 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2368 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2370 [OP_CREATE_SESSION] = nfsd4_decode_create_session,
2371 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2372 [OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2373 [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
2374#ifdef CONFIG_NFSD_PNFS
2375 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2376 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2377 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2378 [OP_LAYOUTGET] = nfsd4_decode_layoutget,
2379 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
2380#else
2381 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2382 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2383 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2384 [OP_LAYOUTGET] = nfsd4_decode_notsupp,
2385 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
2386#endif
2387 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2388 [OP_SEQUENCE] = nfsd4_decode_sequence,
2389 [OP_SET_SSV] = nfsd4_decode_notsupp,
2390 [OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2391 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2392 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2393 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
2394
2395 /* new operations for NFSv4.2 */
2396 [OP_ALLOCATE] = nfsd4_decode_fallocate,
2397 [OP_COPY] = nfsd4_decode_copy,
2398 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2399 [OP_DEALLOCATE] = nfsd4_decode_fallocate,
2400 [OP_IO_ADVISE] = nfsd4_decode_notsupp,
2401 [OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2402 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2403 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2404 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2405 [OP_READ_PLUS] = nfsd4_decode_read,
2406 [OP_SEEK] = nfsd4_decode_seek,
2407 [OP_WRITE_SAME] = nfsd4_decode_notsupp,
2408 [OP_CLONE] = nfsd4_decode_clone,
2409 /* RFC 8276 extended atributes operations */
2410 [OP_GETXATTR] = nfsd4_decode_getxattr,
2411 [OP_SETXATTR] = nfsd4_decode_setxattr,
2412 [OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2413 [OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2414};
2415
2416static inline bool
2417nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418{
2419 if (op->opnum < FIRST_NFS4_OP)
2420 return false;
2421 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2422 return false;
2423 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424 return false;
2425 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2426 return false;
2427 return true;
2428}
2429
2430static bool
2431nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432{
2433 struct nfsd4_op *op;
2434 bool cachethis = false;
2435 int auth_slack= argp->rqstp->rq_auth_slack;
2436 int max_reply = auth_slack + 8; /* opcnt, status */
2437 int readcount = 0;
2438 int readbytes = 0;
2439 __be32 *p;
2440 int i;
2441
2442 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2443 return false;
2444 max_reply += XDR_UNIT;
2445 argp->tag = NULL;
2446 if (unlikely(argp->taglen)) {
2447 if (argp->taglen > NFSD4_MAX_TAGLEN)
2448 return false;
2449 p = xdr_inline_decode(argp->xdr, argp->taglen);
2450 if (!p)
2451 return false;
2452 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2453 if (!argp->tag)
2454 return false;
2455 max_reply += xdr_align_size(argp->taglen);
2456 }
2457
2458 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2459 return false;
2460 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2461 return false;
2462 argp->opcnt = min_t(u32, argp->client_opcnt,
2463 NFSD_MAX_OPS_PER_COMPOUND);
2464
2465 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2466 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2467 if (!argp->ops) {
2468 argp->ops = argp->iops;
2469 return false;
2470 }
2471 }
2472
2473 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2474 argp->opcnt = 0;
2475
2476 for (i = 0; i < argp->opcnt; i++) {
2477 op = &argp->ops[i];
2478 op->replay = NULL;
2479 op->opdesc = NULL;
2480
2481 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2482 return false;
2483 if (nfsd4_opnum_in_range(argp, op)) {
2484 op->opdesc = OPDESC(op);
2485 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2486 if (op->status != nfs_ok)
2487 trace_nfsd_compound_decode_err(argp->rqstp,
2488 argp->opcnt, i,
2489 op->opnum,
2490 op->status);
2491 } else {
2492 op->opnum = OP_ILLEGAL;
2493 op->status = nfserr_op_illegal;
2494 }
2495
2496 /*
2497 * We'll try to cache the result in the DRC if any one
2498 * op in the compound wants to be cached:
2499 */
2500 cachethis |= nfsd4_cache_this_op(op);
2501
2502 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2503 readcount++;
2504 readbytes += nfsd4_max_reply(argp->rqstp, op);
2505 } else
2506 max_reply += nfsd4_max_reply(argp->rqstp, op);
2507 /*
2508 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2509 * (Special case because it will just skip encoding this
2510 * if it runs out of xdr buffer space, and it is the only
2511 * operation that behaves this way.)
2512 */
2513 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2514 max_reply += NFS4_OPAQUE_LIMIT;
2515
2516 if (op->status) {
2517 argp->opcnt = i+1;
2518 break;
2519 }
2520 }
2521 /* Sessions make the DRC unnecessary: */
2522 if (argp->minorversion)
2523 cachethis = false;
2524 svc_reserve(argp->rqstp, max_reply + readbytes);
2525 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2526
2527 argp->splice_ok = nfsd_read_splice_ok(argp->rqstp);
2528 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2529 argp->splice_ok = false;
2530
2531 return true;
2532}
2533
2534static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr,
2535 struct knfsd_fh *fh_handle)
2536{
2537 return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size);
2538}
2539
2540/* This is a frequently-encoded type; open-coded for speed */
2541static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2542 const struct timespec64 *tv)
2543{
2544 __be32 *p;
2545
2546 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2547 if (!p)
2548 return nfserr_resource;
2549 p = xdr_encode_hyper(p, tv->tv_sec);
2550 *p = cpu_to_be32(tv->tv_nsec);
2551 return nfs_ok;
2552}
2553
2554static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr,
2555 unsigned int major, unsigned int minor)
2556{
2557 __be32 status;
2558
2559 status = nfsd4_encode_uint32_t(xdr, major);
2560 if (status != nfs_ok)
2561 return status;
2562 return nfsd4_encode_uint32_t(xdr, minor);
2563}
2564
2565static __be32
2566nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c)
2567{
2568 __be32 status;
2569
2570 status = nfsd4_encode_bool(xdr, c->atomic);
2571 if (status != nfs_ok)
2572 return status;
2573 status = nfsd4_encode_changeid4(xdr, c->before_change);
2574 if (status != nfs_ok)
2575 return status;
2576 return nfsd4_encode_changeid4(xdr, c->after_change);
2577}
2578
2579static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr,
2580 const struct nfs42_netaddr *addr)
2581{
2582 __be32 status;
2583
2584 /* na_r_netid */
2585 status = nfsd4_encode_opaque(xdr, addr->netid, addr->netid_len);
2586 if (status != nfs_ok)
2587 return status;
2588 /* na_r_addr */
2589 return nfsd4_encode_opaque(xdr, addr->addr, addr->addr_len);
2590}
2591
2592/* Encode as an array of strings the string given with components
2593 * separated @sep, escaped with esc_enter and esc_exit.
2594 */
2595static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2596 char *components, char esc_enter,
2597 char esc_exit)
2598{
2599 __be32 *p;
2600 __be32 pathlen;
2601 int pathlen_offset;
2602 int strlen, count=0;
2603 char *str, *end, *next;
2604
2605 dprintk("nfsd4_encode_components(%s)\n", components);
2606
2607 pathlen_offset = xdr->buf->len;
2608 p = xdr_reserve_space(xdr, 4);
2609 if (!p)
2610 return nfserr_resource;
2611 p++; /* We will fill this in with @count later */
2612
2613 end = str = components;
2614 while (*end) {
2615 bool found_esc = false;
2616
2617 /* try to parse as esc_start, ..., esc_end, sep */
2618 if (*str == esc_enter) {
2619 for (; *end && (*end != esc_exit); end++)
2620 /* find esc_exit or end of string */;
2621 next = end + 1;
2622 if (*end && (!*next || *next == sep)) {
2623 str++;
2624 found_esc = true;
2625 }
2626 }
2627
2628 if (!found_esc)
2629 for (; *end && (*end != sep); end++)
2630 /* find sep or end of string */;
2631
2632 strlen = end - str;
2633 if (strlen) {
2634 p = xdr_reserve_space(xdr, strlen + 4);
2635 if (!p)
2636 return nfserr_resource;
2637 p = xdr_encode_opaque(p, str, strlen);
2638 count++;
2639 }
2640 else
2641 end++;
2642 if (found_esc)
2643 end = next;
2644
2645 str = end;
2646 }
2647 pathlen = htonl(count);
2648 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2649 return 0;
2650}
2651
2652/* Encode as an array of strings the string given with components
2653 * separated @sep.
2654 */
2655static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2656 char *components)
2657{
2658 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2659}
2660
2661static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2662 struct nfsd4_fs_location *location)
2663{
2664 __be32 status;
2665
2666 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2667 '[', ']');
2668 if (status)
2669 return status;
2670 status = nfsd4_encode_components(xdr, '/', location->path);
2671 if (status)
2672 return status;
2673 return nfs_ok;
2674}
2675
2676static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2677 const struct path *root,
2678 const struct path *path)
2679{
2680 struct path cur = *path;
2681 __be32 *p;
2682 struct dentry **components = NULL;
2683 unsigned int ncomponents = 0;
2684 __be32 err = nfserr_jukebox;
2685
2686 dprintk("nfsd4_encode_components(");
2687
2688 path_get(&cur);
2689 /* First walk the path up to the nfsd root, and store the
2690 * dentries/path components in an array.
2691 */
2692 for (;;) {
2693 if (path_equal(&cur, root))
2694 break;
2695 if (cur.dentry == cur.mnt->mnt_root) {
2696 if (follow_up(&cur))
2697 continue;
2698 goto out_free;
2699 }
2700 if ((ncomponents & 15) == 0) {
2701 struct dentry **new;
2702 new = krealloc(components,
2703 sizeof(*new) * (ncomponents + 16),
2704 GFP_KERNEL);
2705 if (!new)
2706 goto out_free;
2707 components = new;
2708 }
2709 components[ncomponents++] = cur.dentry;
2710 cur.dentry = dget_parent(cur.dentry);
2711 }
2712 err = nfserr_resource;
2713 p = xdr_reserve_space(xdr, 4);
2714 if (!p)
2715 goto out_free;
2716 *p++ = cpu_to_be32(ncomponents);
2717
2718 while (ncomponents) {
2719 struct dentry *dentry = components[ncomponents - 1];
2720 unsigned int len;
2721
2722 spin_lock(&dentry->d_lock);
2723 len = dentry->d_name.len;
2724 p = xdr_reserve_space(xdr, len + 4);
2725 if (!p) {
2726 spin_unlock(&dentry->d_lock);
2727 goto out_free;
2728 }
2729 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2730 dprintk("/%pd", dentry);
2731 spin_unlock(&dentry->d_lock);
2732 dput(dentry);
2733 ncomponents--;
2734 }
2735
2736 err = 0;
2737out_free:
2738 dprintk(")\n");
2739 while (ncomponents)
2740 dput(components[--ncomponents]);
2741 kfree(components);
2742 path_put(&cur);
2743 return err;
2744}
2745
2746static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2747 struct svc_rqst *rqstp,
2748 struct svc_export *exp)
2749{
2750 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2751 struct svc_export *exp_ps;
2752 unsigned int i;
2753 __be32 status;
2754
2755 /* fs_root */
2756 exp_ps = rqst_find_fsidzero_export(rqstp);
2757 if (IS_ERR(exp_ps))
2758 return nfserrno(PTR_ERR(exp_ps));
2759 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path);
2760 exp_put(exp_ps);
2761 if (status != nfs_ok)
2762 return status;
2763
2764 /* locations<> */
2765 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT)
2766 return nfserr_resource;
2767 for (i = 0; i < fslocs->locations_count; i++) {
2768 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2769 if (status != nfs_ok)
2770 return status;
2771 }
2772
2773 return nfs_ok;
2774}
2775
2776static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2777 struct nfs4_ace *ace)
2778{
2779 __be32 status;
2780
2781 /* type */
2782 status = nfsd4_encode_acetype4(xdr, ace->type);
2783 if (status != nfs_ok)
2784 return nfserr_resource;
2785 /* flag */
2786 status = nfsd4_encode_aceflag4(xdr, ace->flag);
2787 if (status != nfs_ok)
2788 return nfserr_resource;
2789 /* access mask */
2790 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2791 if (status != nfs_ok)
2792 return nfserr_resource;
2793 /* who */
2794 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2795 return nfs4_acl_write_who(xdr, ace->whotype);
2796 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2797 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2798 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2799}
2800
2801#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2802 FATTR4_WORD0_RDATTR_ERROR)
2803#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2804#define WORD2_ABSENT_FS_ATTRS 0
2805
2806#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2807static inline __be32
2808nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2809 void *context, int len)
2810{
2811 __be32 *p;
2812
2813 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2814 if (!p)
2815 return nfserr_resource;
2816
2817 /*
2818 * For now we use a 0 here to indicate the null translation; in
2819 * the future we may place a call to translation code here.
2820 */
2821 *p++ = cpu_to_be32(0); /* lfs */
2822 *p++ = cpu_to_be32(0); /* pi */
2823 p = xdr_encode_opaque(p, context, len);
2824 return 0;
2825}
2826#else
2827static inline __be32
2828nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2829 void *context, int len)
2830{ return 0; }
2831#endif
2832
2833static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2834{
2835 /* As per referral draft: */
2836 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2837 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2838 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2839 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2840 *rdattr_err = NFSERR_MOVED;
2841 else
2842 return nfserr_moved;
2843 }
2844 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2845 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2846 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2847 return 0;
2848}
2849
2850
2851static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2852{
2853 struct path path = exp->ex_path;
2854 struct kstat stat;
2855 int err;
2856
2857 path_get(&path);
2858 while (follow_up(&path)) {
2859 if (path.dentry != path.mnt->mnt_root)
2860 break;
2861 }
2862 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2863 path_put(&path);
2864 if (!err)
2865 *pino = stat.ino;
2866 return err;
2867}
2868
2869static __be32
2870nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2871{
2872 __be32 *p;
2873
2874 if (bmval2) {
2875 p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2876 if (!p)
2877 goto out_resource;
2878 *p++ = cpu_to_be32(3);
2879 *p++ = cpu_to_be32(bmval0);
2880 *p++ = cpu_to_be32(bmval1);
2881 *p++ = cpu_to_be32(bmval2);
2882 } else if (bmval1) {
2883 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2884 if (!p)
2885 goto out_resource;
2886 *p++ = cpu_to_be32(2);
2887 *p++ = cpu_to_be32(bmval0);
2888 *p++ = cpu_to_be32(bmval1);
2889 } else {
2890 p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2891 if (!p)
2892 goto out_resource;
2893 *p++ = cpu_to_be32(1);
2894 *p++ = cpu_to_be32(bmval0);
2895 }
2896
2897 return nfs_ok;
2898out_resource:
2899 return nfserr_resource;
2900}
2901
2902struct nfsd4_fattr_args {
2903 struct svc_rqst *rqstp;
2904 struct svc_fh *fhp;
2905 struct svc_export *exp;
2906 struct dentry *dentry;
2907 struct kstat stat;
2908 struct kstatfs statfs;
2909 struct nfs4_acl *acl;
2910 u64 size;
2911#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2912 void *context;
2913 int contextlen;
2914#endif
2915 u32 rdattr_err;
2916 bool contextsupport;
2917 bool ignore_crossmnt;
2918};
2919
2920typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2921 const struct nfsd4_fattr_args *args);
2922
2923static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2924 const struct nfsd4_fattr_args *args)
2925{
2926 return nfs_ok;
2927}
2928
2929static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2930 const struct nfsd4_fattr_args *args)
2931{
2932 return nfsd4_encode_bool(xdr, true);
2933}
2934
2935static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2936 const struct nfsd4_fattr_args *args)
2937{
2938 return nfsd4_encode_bool(xdr, false);
2939}
2940
2941static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2942 const struct nfsd4_fattr_args *args)
2943{
2944 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2945 u32 minorversion = resp->cstate.minorversion;
2946 u32 supp[3];
2947
2948 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2949 if (!IS_POSIXACL(d_inode(args->dentry)))
2950 supp[0] &= ~FATTR4_WORD0_ACL;
2951 if (!args->contextsupport)
2952 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2953
2954 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
2955}
2956
2957static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2958 const struct nfsd4_fattr_args *args)
2959{
2960 __be32 *p;
2961
2962 p = xdr_reserve_space(xdr, XDR_UNIT);
2963 if (!p)
2964 return nfserr_resource;
2965
2966 switch (args->stat.mode & S_IFMT) {
2967 case S_IFIFO:
2968 *p = cpu_to_be32(NF4FIFO);
2969 break;
2970 case S_IFCHR:
2971 *p = cpu_to_be32(NF4CHR);
2972 break;
2973 case S_IFDIR:
2974 *p = cpu_to_be32(NF4DIR);
2975 break;
2976 case S_IFBLK:
2977 *p = cpu_to_be32(NF4BLK);
2978 break;
2979 case S_IFLNK:
2980 *p = cpu_to_be32(NF4LNK);
2981 break;
2982 case S_IFREG:
2983 *p = cpu_to_be32(NF4REG);
2984 break;
2985 case S_IFSOCK:
2986 *p = cpu_to_be32(NF4SOCK);
2987 break;
2988 default:
2989 return nfserr_serverfault;
2990 }
2991
2992 return nfs_ok;
2993}
2994
2995static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
2996 const struct nfsd4_fattr_args *args)
2997{
2998 u32 mask;
2999
3000 mask = NFS4_FH_PERSISTENT;
3001 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3002 mask |= NFS4_FH_VOL_RENAME;
3003 return nfsd4_encode_uint32_t(xdr, mask);
3004}
3005
3006static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3007 const struct nfsd4_fattr_args *args)
3008{
3009 const struct svc_export *exp = args->exp;
3010 u64 c;
3011
3012 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3013 u32 flush_time = convert_to_wallclock(exp->cd->flush_time);
3014
3015 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT)
3016 return nfserr_resource;
3017 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3018 return nfserr_resource;
3019 return nfs_ok;
3020 }
3021
3022 c = nfsd4_change_attribute(&args->stat, d_inode(args->dentry));
3023 return nfsd4_encode_changeid4(xdr, c);
3024}
3025
3026static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3027 const struct nfsd4_fattr_args *args)
3028{
3029 return nfsd4_encode_uint64_t(xdr, args->size);
3030}
3031
3032static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3033 const struct nfsd4_fattr_args *args)
3034{
3035 __be32 *p;
3036
3037 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3038 if (!p)
3039 return nfserr_resource;
3040
3041 if (unlikely(args->exp->ex_fslocs.migrated)) {
3042 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3043 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3044 return nfs_ok;
3045 }
3046 switch (fsid_source(args->fhp)) {
3047 case FSIDSOURCE_FSID:
3048 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid);
3049 xdr_encode_hyper(p, (u64)0);
3050 break;
3051 case FSIDSOURCE_DEV:
3052 *p++ = xdr_zero;
3053 *p++ = cpu_to_be32(MAJOR(args->stat.dev));
3054 *p++ = xdr_zero;
3055 *p = cpu_to_be32(MINOR(args->stat.dev));
3056 break;
3057 case FSIDSOURCE_UUID:
3058 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN);
3059 break;
3060 }
3061
3062 return nfs_ok;
3063}
3064
3065static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3066 const struct nfsd4_fattr_args *args)
3067{
3068 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id);
3069
3070 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3071}
3072
3073static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3074 const struct nfsd4_fattr_args *args)
3075{
3076 return nfsd4_encode_uint32_t(xdr, args->rdattr_err);
3077}
3078
3079static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3080 const struct nfsd4_fattr_args *args)
3081{
3082 u32 mask;
3083
3084 mask = 0;
3085 if (IS_POSIXACL(d_inode(args->dentry)))
3086 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3087 return nfsd4_encode_uint32_t(xdr, mask);
3088}
3089
3090static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3091 const struct nfsd4_fattr_args *args)
3092{
3093 struct nfs4_acl *acl = args->acl;
3094 struct nfs4_ace *ace;
3095 __be32 status;
3096
3097 /* nfsace4<> */
3098 if (!acl) {
3099 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3100 return nfserr_resource;
3101 } else {
3102 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT)
3103 return nfserr_resource;
3104 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3105 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace);
3106 if (status != nfs_ok)
3107 return status;
3108 }
3109 }
3110 return nfs_ok;
3111}
3112
3113static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3114 const struct nfsd4_fattr_args *args)
3115{
3116 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle);
3117}
3118
3119static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3120 const struct nfsd4_fattr_args *args)
3121{
3122 return nfsd4_encode_uint64_t(xdr, args->stat.ino);
3123}
3124
3125static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3126 const struct nfsd4_fattr_args *args)
3127{
3128 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3129}
3130
3131static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3132 const struct nfsd4_fattr_args *args)
3133{
3134 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3135}
3136
3137static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3138 const struct nfsd4_fattr_args *args)
3139{
3140 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files);
3141}
3142
3143static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3144 const struct nfsd4_fattr_args *args)
3145{
3146 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp);
3147}
3148
3149static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3150 const struct nfsd4_fattr_args *args)
3151{
3152 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3153
3154 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes);
3155}
3156
3157static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3158 const struct nfsd4_fattr_args *args)
3159{
3160 return nfsd4_encode_uint32_t(xdr, 255);
3161}
3162
3163static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3164 const struct nfsd4_fattr_args *args)
3165{
3166 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen);
3167}
3168
3169static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3170 const struct nfsd4_fattr_args *args)
3171{
3172 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3173}
3174
3175static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3176 const struct nfsd4_fattr_args *args)
3177{
3178 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3179}
3180
3181static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3182 const struct nfsd4_fattr_args *args)
3183{
3184 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3185}
3186
3187static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3188 const struct nfsd4_fattr_args *args)
3189{
3190 return nfsd4_encode_uint32_t(xdr, args->stat.nlink);
3191}
3192
3193static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3194 const struct nfsd4_fattr_args *args)
3195{
3196 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3197}
3198
3199static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3200 const struct nfsd4_fattr_args *args)
3201{
3202 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3203}
3204
3205static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3206 const struct nfsd4_fattr_args *args)
3207{
3208 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3209 MINOR(args->stat.rdev));
3210}
3211
3212static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3213 const struct nfsd4_fattr_args *args)
3214{
3215 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3216
3217 return nfsd4_encode_uint64_t(xdr, avail);
3218}
3219
3220static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3221 const struct nfsd4_fattr_args *args)
3222{
3223 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3224
3225 return nfsd4_encode_uint64_t(xdr, free);
3226}
3227
3228static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3229 const struct nfsd4_fattr_args *args)
3230{
3231 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3232
3233 return nfsd4_encode_uint64_t(xdr, total);
3234}
3235
3236static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3237 const struct nfsd4_fattr_args *args)
3238{
3239 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9);
3240}
3241
3242static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3243 const struct nfsd4_fattr_args *args)
3244{
3245 return nfsd4_encode_nfstime4(xdr, &args->stat.atime);
3246}
3247
3248static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3249 const struct nfsd4_fattr_args *args)
3250{
3251 return nfsd4_encode_nfstime4(xdr, &args->stat.btime);
3252}
3253
3254/*
3255 * ctime (in NFSv4, time_metadata) is not writeable, and the client
3256 * doesn't really care what resolution could theoretically be stored by
3257 * the filesystem.
3258 *
3259 * The client cares how close together changes can be while still
3260 * guaranteeing ctime changes. For most filesystems (which have
3261 * timestamps with nanosecond fields) that is limited by the resolution
3262 * of the time returned from current_time() (which I'm assuming to be
3263 * 1/HZ).
3264 */
3265static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3266 const struct nfsd4_fattr_args *args)
3267{
3268 const struct inode *inode = d_inode(args->dentry);
3269 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3270 struct timespec64 ts = ns_to_timespec64(ns);
3271
3272 return nfsd4_encode_nfstime4(xdr, &ts);
3273}
3274
3275static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3276 const struct nfsd4_fattr_args *args)
3277{
3278 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime);
3279}
3280
3281static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3282 const struct nfsd4_fattr_args *args)
3283{
3284 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime);
3285}
3286
3287static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3288 const struct nfsd4_fattr_args *args)
3289{
3290 u64 ino;
3291 int err;
3292
3293 if (!args->ignore_crossmnt &&
3294 args->dentry == args->exp->ex_path.mnt->mnt_root) {
3295 err = nfsd4_get_mounted_on_ino(args->exp, &ino);
3296 if (err)
3297 return nfserrno(err);
3298 } else
3299 ino = args->stat.ino;
3300
3301 return nfsd4_encode_uint64_t(xdr, ino);
3302}
3303
3304#ifdef CONFIG_NFSD_PNFS
3305
3306static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3307 const struct nfsd4_fattr_args *args)
3308{
3309 unsigned long mask = args->exp->ex_layout_types;
3310 int i;
3311
3312 /* Hamming weight of @mask is the number of layout types to return */
3313 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3314 return nfserr_resource;
3315 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3316 if (mask & BIT(i)) {
3317 /* layouttype4 */
3318 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3319 return nfserr_resource;
3320 }
3321 return nfs_ok;
3322}
3323
3324static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3325 const struct nfsd4_fattr_args *args)
3326{
3327 unsigned long mask = args->exp->ex_layout_types;
3328 int i;
3329
3330 /* Hamming weight of @mask is the number of layout types to return */
3331 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3332 return nfserr_resource;
3333 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3334 if (mask & BIT(i)) {
3335 /* layouttype4 */
3336 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3337 return nfserr_resource;
3338 }
3339 return nfs_ok;
3340}
3341
3342static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3343 const struct nfsd4_fattr_args *args)
3344{
3345 return nfsd4_encode_uint32_t(xdr, args->stat.blksize);
3346}
3347
3348#endif
3349
3350static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3351 const struct nfsd4_fattr_args *args)
3352{
3353 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3354 u32 supp[3];
3355
3356 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3357 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3358 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3359 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3360
3361 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
3362}
3363
3364#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3365static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3366 const struct nfsd4_fattr_args *args)
3367{
3368 return nfsd4_encode_security_label(xdr, args->rqstp,
3369 args->context, args->contextlen);
3370}
3371#endif
3372
3373static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3374 const struct nfsd4_fattr_args *args)
3375{
3376 int err = xattr_supports_user_prefix(d_inode(args->dentry));
3377
3378 return nfsd4_encode_bool(xdr, err == 0);
3379}
3380
3381static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3382 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3383 [FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3384 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3385 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3386 [FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3387 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3388 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3389 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3390 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3391 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3392 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3393 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3394 [FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3395 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3396 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3397 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3398 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3399 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3400 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3401 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3402 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3403 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3404 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3405 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3406 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3407 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3408 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3409 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3410 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3411 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3412 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3413 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3414 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3415 [FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3416 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3417 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3418 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3419 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3420 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3421 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3422 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3423 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3424 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3425 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3426 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3427 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3428 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3429 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3430 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3431 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3432 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3433 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3434 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3435 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3436 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3437 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3438 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3439 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3440 [FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3441 [FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3442 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3443 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3444
3445#ifdef CONFIG_NFSD_PNFS
3446 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3447 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3448 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3449 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3450 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3451#else
3452 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3453 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3454 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3455 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3456 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3457#endif
3458
3459 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3460 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3461 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3462 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3463 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3464 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3465 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3466 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3467 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3468 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3469 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3470 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3471 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3472
3473#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3474 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3475#else
3476 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3477#endif
3478
3479 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3480 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3481};
3482
3483/*
3484 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3485 * ourselves.
3486 */
3487static __be32
3488nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3489 struct svc_fh *fhp, struct svc_export *exp,
3490 struct dentry *dentry, const u32 *bmval,
3491 int ignore_crossmnt)
3492{
3493 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3494 struct nfsd4_fattr_args args;
3495 struct svc_fh *tempfh = NULL;
3496 int starting_len = xdr->buf->len;
3497 __be32 *attrlen_p, status;
3498 int attrlen_offset;
3499 u32 attrmask[3];
3500 int err;
3501 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3502 u32 minorversion = resp->cstate.minorversion;
3503 struct path path = {
3504 .mnt = exp->ex_path.mnt,
3505 .dentry = dentry,
3506 };
3507 unsigned long bit;
3508 bool file_modified = false;
3509 u64 size = 0;
3510
3511 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3512 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3513
3514 args.rqstp = rqstp;
3515 args.exp = exp;
3516 args.dentry = dentry;
3517 args.ignore_crossmnt = (ignore_crossmnt != 0);
3518 args.acl = NULL;
3519
3520 /*
3521 * Make a local copy of the attribute bitmap that can be modified.
3522 */
3523 attrmask[0] = bmval[0];
3524 attrmask[1] = bmval[1];
3525 attrmask[2] = bmval[2];
3526
3527 args.rdattr_err = 0;
3528 if (exp->ex_fslocs.migrated) {
3529 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1],
3530 &attrmask[2], &args.rdattr_err);
3531 if (status)
3532 goto out;
3533 }
3534 args.size = 0;
3535 if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
3536 status = nfsd4_deleg_getattr_conflict(rqstp, d_inode(dentry),
3537 &file_modified, &size);
3538 if (status)
3539 goto out;
3540 }
3541
3542 err = vfs_getattr(&path, &args.stat,
3543 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3544 AT_STATX_SYNC_AS_STAT);
3545 if (err)
3546 goto out_nfserr;
3547 if (file_modified)
3548 args.size = size;
3549 else
3550 args.size = args.stat.size;
3551
3552 if (!(args.stat.result_mask & STATX_BTIME))
3553 /* underlying FS does not offer btime so we can't share it */
3554 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3555 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3556 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3557 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3558 FATTR4_WORD1_SPACE_TOTAL))) {
3559 err = vfs_statfs(&path, &args.statfs);
3560 if (err)
3561 goto out_nfserr;
3562 }
3563 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3564 !fhp) {
3565 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
3566 status = nfserr_jukebox;
3567 if (!tempfh)
3568 goto out;
3569 fh_init(tempfh, NFS4_FHSIZE);
3570 status = fh_compose(tempfh, exp, dentry, NULL);
3571 if (status)
3572 goto out;
3573 args.fhp = tempfh;
3574 } else
3575 args.fhp = fhp;
3576
3577 if (attrmask[0] & FATTR4_WORD0_ACL) {
3578 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
3579 if (err == -EOPNOTSUPP)
3580 attrmask[0] &= ~FATTR4_WORD0_ACL;
3581 else if (err == -EINVAL) {
3582 status = nfserr_attrnotsupp;
3583 goto out;
3584 } else if (err != 0)
3585 goto out_nfserr;
3586 }
3587
3588 args.contextsupport = false;
3589
3590#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3591 args.context = NULL;
3592 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3593 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3594 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3595 err = security_inode_getsecctx(d_inode(dentry),
3596 &args.context, &args.contextlen);
3597 else
3598 err = -EOPNOTSUPP;
3599 args.contextsupport = (err == 0);
3600 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3601 if (err == -EOPNOTSUPP)
3602 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3603 else if (err)
3604 goto out_nfserr;
3605 }
3606 }
3607#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3608
3609 /* attrmask */
3610 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1],
3611 attrmask[2]);
3612 if (status)
3613 goto out;
3614
3615 /* attr_vals */
3616 attrlen_offset = xdr->buf->len;
3617 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3618 if (!attrlen_p)
3619 goto out_resource;
3620 bitmap_from_arr32(attr_bitmap, attrmask,
3621 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3622 for_each_set_bit(bit, attr_bitmap,
3623 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3624 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3625 if (status != nfs_ok)
3626 goto out;
3627 }
3628 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3629 status = nfs_ok;
3630
3631out:
3632#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3633 if (args.context)
3634 security_release_secctx(args.context, args.contextlen);
3635#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3636 kfree(args.acl);
3637 if (tempfh) {
3638 fh_put(tempfh);
3639 kfree(tempfh);
3640 }
3641 if (status)
3642 xdr_truncate_encode(xdr, starting_len);
3643 return status;
3644out_nfserr:
3645 status = nfserrno(err);
3646 goto out;
3647out_resource:
3648 status = nfserr_resource;
3649 goto out;
3650}
3651
3652static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3653 struct xdr_buf *buf, __be32 *p, int bytes)
3654{
3655 xdr->scratch.iov_len = 0;
3656 memset(buf, 0, sizeof(struct xdr_buf));
3657 buf->head[0].iov_base = p;
3658 buf->head[0].iov_len = 0;
3659 buf->len = 0;
3660 xdr->buf = buf;
3661 xdr->iov = buf->head;
3662 xdr->p = p;
3663 xdr->end = (void *)p + bytes;
3664 buf->buflen = bytes;
3665}
3666
3667__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3668 struct svc_fh *fhp, struct svc_export *exp,
3669 struct dentry *dentry, u32 *bmval,
3670 struct svc_rqst *rqstp, int ignore_crossmnt)
3671{
3672 struct xdr_buf dummy;
3673 struct xdr_stream xdr;
3674 __be32 ret;
3675
3676 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3677 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval,
3678 ignore_crossmnt);
3679 *p = xdr.p;
3680 return ret;
3681}
3682
3683/*
3684 * The buffer space for this field was reserved during a previous
3685 * call to nfsd4_encode_entry4().
3686 */
3687static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3688 u64 offset)
3689{
3690 __be64 cookie = cpu_to_be64(offset);
3691 struct xdr_stream *xdr = readdir->xdr;
3692
3693 if (!readdir->cookie_offset)
3694 return;
3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3696 sizeof(cookie));
3697}
3698
3699static inline int attributes_need_mount(u32 *bmval)
3700{
3701 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3702 return 1;
3703 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3704 return 1;
3705 return 0;
3706}
3707
3708static __be32
3709nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3710 int namlen)
3711{
3712 struct svc_export *exp = cd->rd_fhp->fh_export;
3713 struct dentry *dentry;
3714 __be32 nfserr;
3715 int ignore_crossmnt = 0;
3716
3717 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3718 if (IS_ERR(dentry))
3719 return nfserrno(PTR_ERR(dentry));
3720
3721 exp_get(exp);
3722 /*
3723 * In the case of a mountpoint, the client may be asking for
3724 * attributes that are only properties of the underlying filesystem
3725 * as opposed to the cross-mounted file system. In such a case,
3726 * we will not follow the cross mount and will fill the attribtutes
3727 * directly from the mountpoint dentry.
3728 */
3729 if (nfsd_mountpoint(dentry, exp)) {
3730 int err;
3731
3732 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3733 && !attributes_need_mount(cd->rd_bmval)) {
3734 ignore_crossmnt = 1;
3735 goto out_encode;
3736 }
3737 /*
3738 * Why the heck aren't we just using nfsd_lookup??
3739 * Different "."/".." handling? Something else?
3740 * At least, add a comment here to explain....
3741 */
3742 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3743 if (err) {
3744 nfserr = nfserrno(err);
3745 goto out_put;
3746 }
3747 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3748 if (nfserr)
3749 goto out_put;
3750
3751 }
3752out_encode:
3753 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry,
3754 cd->rd_bmval, ignore_crossmnt);
3755out_put:
3756 dput(dentry);
3757 exp_put(exp);
3758 return nfserr;
3759}
3760
3761static __be32
3762nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3763{
3764 __be32 status;
3765
3766 /* attrmask */
3767 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0);
3768 if (status != nfs_ok)
3769 return status;
3770 /* attr_vals */
3771 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3772 return nfserr_resource;
3773 /* rdattr_error */
3774 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT)
3775 return nfserr_resource;
3776 return nfs_ok;
3777}
3778
3779static int
3780nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3781 loff_t offset, u64 ino, unsigned int d_type)
3782{
3783 struct readdir_cd *ccd = ccdv;
3784 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3785 struct xdr_stream *xdr = cd->xdr;
3786 int start_offset = xdr->buf->len;
3787 int cookie_offset;
3788 u32 name_and_cookie;
3789 int entry_bytes;
3790 __be32 nfserr = nfserr_toosmall;
3791
3792 /* In nfsv4, "." and ".." never make it onto the wire.. */
3793 if (name && isdotent(name, namlen)) {
3794 cd->common.err = nfs_ok;
3795 return 0;
3796 }
3797
3798 /* Encode the previous entry's cookie value */
3799 nfsd4_encode_entry4_nfs_cookie4(cd, offset);
3800
3801 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3802 goto fail;
3803
3804 /* Reserve send buffer space for this entry's cookie value. */
3805 cookie_offset = xdr->buf->len;
3806 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3807 goto fail;
3808 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3809 goto fail;
3810 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3811 switch (nfserr) {
3812 case nfs_ok:
3813 break;
3814 case nfserr_resource:
3815 nfserr = nfserr_toosmall;
3816 goto fail;
3817 case nfserr_noent:
3818 xdr_truncate_encode(xdr, start_offset);
3819 goto skip_entry;
3820 case nfserr_jukebox:
3821 /*
3822 * The pseudoroot should only display dentries that lead to
3823 * exports. If we get EJUKEBOX here, then we can't tell whether
3824 * this entry should be included. Just fail the whole READDIR
3825 * with NFS4ERR_DELAY in that case, and hope that the situation
3826 * will resolve itself by the client's next attempt.
3827 */
3828 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3829 goto fail;
3830 fallthrough;
3831 default:
3832 /*
3833 * If the client requested the RDATTR_ERROR attribute,
3834 * we stuff the error code into this attribute
3835 * and continue. If this attribute was not requested,
3836 * then in accordance with the spec, we fail the
3837 * entire READDIR operation(!)
3838 */
3839 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3840 goto fail;
3841 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3842 nfserr = nfserr_toosmall;
3843 goto fail;
3844 }
3845 }
3846 nfserr = nfserr_toosmall;
3847 entry_bytes = xdr->buf->len - start_offset;
3848 if (entry_bytes > cd->rd_maxcount)
3849 goto fail;
3850 cd->rd_maxcount -= entry_bytes;
3851 /*
3852 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3853 * notes that it could be zero. If it is zero, then the server
3854 * should enforce only the rd_maxcount value.
3855 */
3856 if (cd->rd_dircount) {
3857 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3858 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3859 goto fail;
3860 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3861 if (!cd->rd_dircount)
3862 cd->rd_maxcount = 0;
3863 }
3864
3865 cd->cookie_offset = cookie_offset;
3866skip_entry:
3867 cd->common.err = nfs_ok;
3868 return 0;
3869fail:
3870 xdr_truncate_encode(xdr, start_offset);
3871 cd->common.err = nfserr;
3872 return -EINVAL;
3873}
3874
3875static __be32
3876nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3877{
3878 __be32 *p;
3879
3880 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3881 if (!p)
3882 return nfserr_resource;
3883 memcpy(p, verf->data, sizeof(verf->data));
3884 return nfs_ok;
3885}
3886
3887static __be32
3888nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3889{
3890 __be32 *p;
3891
3892 p = xdr_reserve_space(xdr, sizeof(__be64));
3893 if (!p)
3894 return nfserr_resource;
3895 memcpy(p, clientid, sizeof(*clientid));
3896 return nfs_ok;
3897}
3898
3899/* This is a frequently-encoded item; open-coded for speed */
3900static __be32
3901nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
3902{
3903 __be32 *p;
3904
3905 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
3906 if (!p)
3907 return nfserr_resource;
3908 *p++ = cpu_to_be32(sid->si_generation);
3909 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
3910 return nfs_ok;
3911}
3912
3913static __be32
3914nfsd4_encode_sessionid4(struct xdr_stream *xdr,
3915 const struct nfs4_sessionid *sessionid)
3916{
3917 return nfsd4_encode_opaque_fixed(xdr, sessionid->data,
3918 NFS4_MAX_SESSIONID_LEN);
3919}
3920
3921static __be32
3922nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3923 union nfsd4_op_u *u)
3924{
3925 struct nfsd4_access *access = &u->access;
3926 struct xdr_stream *xdr = resp->xdr;
3927 __be32 status;
3928
3929 /* supported */
3930 status = nfsd4_encode_uint32_t(xdr, access->ac_supported);
3931 if (status != nfs_ok)
3932 return status;
3933 /* access */
3934 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access);
3935}
3936
3937static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3938 union nfsd4_op_u *u)
3939{
3940 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3941 struct xdr_stream *xdr = resp->xdr;
3942
3943 /* bctsr_sessid */
3944 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid);
3945 if (nfserr != nfs_ok)
3946 return nfserr;
3947 /* bctsr_dir */
3948 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT)
3949 return nfserr_resource;
3950 /* bctsr_use_conn_in_rdma_mode */
3951 return nfsd4_encode_bool(xdr, false);
3952}
3953
3954static __be32
3955nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3956 union nfsd4_op_u *u)
3957{
3958 struct nfsd4_close *close = &u->close;
3959 struct xdr_stream *xdr = resp->xdr;
3960
3961 /* open_stateid */
3962 return nfsd4_encode_stateid4(xdr, &close->cl_stateid);
3963}
3964
3965
3966static __be32
3967nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3968 union nfsd4_op_u *u)
3969{
3970 struct nfsd4_commit *commit = &u->commit;
3971
3972 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf);
3973}
3974
3975static __be32
3976nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3977 union nfsd4_op_u *u)
3978{
3979 struct nfsd4_create *create = &u->create;
3980 struct xdr_stream *xdr = resp->xdr;
3981
3982 /* cinfo */
3983 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo);
3984 if (nfserr)
3985 return nfserr;
3986 /* attrset */
3987 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0],
3988 create->cr_bmval[1], create->cr_bmval[2]);
3989}
3990
3991static __be32
3992nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3993 union nfsd4_op_u *u)
3994{
3995 struct nfsd4_getattr *getattr = &u->getattr;
3996 struct svc_fh *fhp = getattr->ga_fhp;
3997 struct xdr_stream *xdr = resp->xdr;
3998
3999 /* obj_attributes */
4000 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export,
4001 fhp->fh_dentry, getattr->ga_bmval, 0);
4002}
4003
4004static __be32
4005nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4006 union nfsd4_op_u *u)
4007{
4008 struct xdr_stream *xdr = resp->xdr;
4009 struct svc_fh *fhp = u->getfh;
4010
4011 /* object */
4012 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle);
4013}
4014
4015static __be32
4016nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4017 const struct xdr_netobj *owner)
4018{
4019 __be32 status;
4020
4021 /* clientid */
4022 status = nfsd4_encode_clientid4(xdr, clientid);
4023 if (status != nfs_ok)
4024 return status;
4025 /* owner */
4026 return nfsd4_encode_opaque(xdr, owner->data, owner->len);
4027}
4028
4029static __be32
4030nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4031 const struct nfsd4_lock_denied *ld)
4032{
4033 __be32 status;
4034
4035 /* offset */
4036 status = nfsd4_encode_offset4(xdr, ld->ld_start);
4037 if (status != nfs_ok)
4038 return status;
4039 /* length */
4040 status = nfsd4_encode_length4(xdr, ld->ld_length);
4041 if (status != nfs_ok)
4042 return status;
4043 /* locktype */
4044 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT)
4045 return nfserr_resource;
4046 /* owner */
4047 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
4048 &ld->ld_owner);
4049}
4050
4051static __be32
4052nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4053 union nfsd4_op_u *u)
4054{
4055 struct nfsd4_lock *lock = &u->lock;
4056 struct xdr_stream *xdr = resp->xdr;
4057 __be32 status;
4058
4059 switch (nfserr) {
4060 case nfs_ok:
4061 /* resok4 */
4062 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
4063 break;
4064 case nfserr_denied:
4065 /* denied */
4066 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied);
4067 break;
4068 default:
4069 return nfserr;
4070 }
4071 return status != nfs_ok ? status : nfserr;
4072}
4073
4074static __be32
4075nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4076 union nfsd4_op_u *u)
4077{
4078 struct nfsd4_lockt *lockt = &u->lockt;
4079 struct xdr_stream *xdr = resp->xdr;
4080 __be32 status;
4081
4082 if (nfserr == nfserr_denied) {
4083 /* denied */
4084 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied);
4085 if (status != nfs_ok)
4086 return status;
4087 }
4088 return nfserr;
4089}
4090
4091static __be32
4092nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4093 union nfsd4_op_u *u)
4094{
4095 struct nfsd4_locku *locku = &u->locku;
4096 struct xdr_stream *xdr = resp->xdr;
4097
4098 /* lock_stateid */
4099 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid);
4100}
4101
4102
4103static __be32
4104nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4105 union nfsd4_op_u *u)
4106{
4107 struct nfsd4_link *link = &u->link;
4108 struct xdr_stream *xdr = resp->xdr;
4109
4110 return nfsd4_encode_change_info4(xdr, &link->li_cinfo);
4111}
4112
4113/*
4114 * This implementation does not yet support returning an ACE in an
4115 * OPEN that offers a delegation.
4116 */
4117static __be32
4118nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4119{
4120 __be32 status;
4121
4122 /* type */
4123 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4124 if (status != nfs_ok)
4125 return nfserr_resource;
4126 /* flag */
4127 status = nfsd4_encode_aceflag4(xdr, 0);
4128 if (status != nfs_ok)
4129 return nfserr_resource;
4130 /* access mask */
4131 status = nfsd4_encode_acemask4(xdr, 0);
4132 if (status != nfs_ok)
4133 return nfserr_resource;
4134 /* who - empty for now */
4135 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4136 return nfserr_resource;
4137 return nfs_ok;
4138}
4139
4140static __be32
4141nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4142{
4143 __be32 status;
4144
4145 /* stateid */
4146 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4147 if (status != nfs_ok)
4148 return status;
4149 /* recall */
4150 status = nfsd4_encode_bool(xdr, open->op_recall);
4151 if (status != nfs_ok)
4152 return status;
4153 /* permissions */
4154 return nfsd4_encode_open_nfsace4(xdr);
4155}
4156
4157static __be32
4158nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4159{
4160 /* limitby */
4161 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT)
4162 return nfserr_resource;
4163 /* filesize */
4164 return nfsd4_encode_uint64_t(xdr, filesize);
4165}
4166
4167static __be32
4168nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4169 struct nfsd4_open *open)
4170{
4171 __be32 status;
4172
4173 /* stateid */
4174 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4175 if (status != nfs_ok)
4176 return status;
4177 /* recall */
4178 status = nfsd4_encode_bool(xdr, open->op_recall);
4179 if (status != nfs_ok)
4180 return status;
4181 /* space_limit */
4182 status = nfsd4_encode_nfs_space_limit4(xdr, 0);
4183 if (status != nfs_ok)
4184 return status;
4185 return nfsd4_encode_open_nfsace4(xdr);
4186}
4187
4188static __be32
4189nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4190 struct nfsd4_open *open)
4191{
4192 __be32 status = nfs_ok;
4193
4194 /* ond_why */
4195 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT)
4196 return nfserr_resource;
4197 switch (open->op_why_no_deleg) {
4198 case WND4_CONTENTION:
4199 /* ond_server_will_push_deleg */
4200 status = nfsd4_encode_bool(xdr, false);
4201 break;
4202 case WND4_RESOURCE:
4203 /* ond_server_will_signal_avail */
4204 status = nfsd4_encode_bool(xdr, false);
4205 }
4206 return status;
4207}
4208
4209static __be32
4210nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4211{
4212 __be32 status;
4213
4214 /* delegation_type */
4215 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT)
4216 return nfserr_resource;
4217 switch (open->op_delegate_type) {
4218 case NFS4_OPEN_DELEGATE_NONE:
4219 status = nfs_ok;
4220 break;
4221 case NFS4_OPEN_DELEGATE_READ:
4222 /* read */
4223 status = nfsd4_encode_open_read_delegation4(xdr, open);
4224 break;
4225 case NFS4_OPEN_DELEGATE_WRITE:
4226 /* write */
4227 status = nfsd4_encode_open_write_delegation4(xdr, open);
4228 break;
4229 case NFS4_OPEN_DELEGATE_NONE_EXT:
4230 /* od_whynone */
4231 status = nfsd4_encode_open_none_delegation4(xdr, open);
4232 break;
4233 default:
4234 status = nfserr_serverfault;
4235 }
4236
4237 return status;
4238}
4239
4240static __be32
4241nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4242 union nfsd4_op_u *u)
4243{
4244 struct nfsd4_open *open = &u->open;
4245 struct xdr_stream *xdr = resp->xdr;
4246
4247 /* stateid */
4248 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid);
4249 if (nfserr != nfs_ok)
4250 return nfserr;
4251 /* cinfo */
4252 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo);
4253 if (nfserr != nfs_ok)
4254 return nfserr;
4255 /* rflags */
4256 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags);
4257 if (nfserr != nfs_ok)
4258 return nfserr;
4259 /* attrset */
4260 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0],
4261 open->op_bmval[1], open->op_bmval[2]);
4262 if (nfserr != nfs_ok)
4263 return nfserr;
4264 /* delegation */
4265 return nfsd4_encode_open_delegation4(xdr, open);
4266}
4267
4268static __be32
4269nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4270 union nfsd4_op_u *u)
4271{
4272 struct nfsd4_open_confirm *oc = &u->open_confirm;
4273 struct xdr_stream *xdr = resp->xdr;
4274
4275 /* open_stateid */
4276 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid);
4277}
4278
4279static __be32
4280nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4281 union nfsd4_op_u *u)
4282{
4283 struct nfsd4_open_downgrade *od = &u->open_downgrade;
4284 struct xdr_stream *xdr = resp->xdr;
4285
4286 /* open_stateid */
4287 return nfsd4_encode_stateid4(xdr, &od->od_stateid);
4288}
4289
4290/*
4291 * The operation of this function assumes that this is the only
4292 * READ operation in the COMPOUND. If there are multiple READs,
4293 * we use nfsd4_encode_readv().
4294 */
4295static __be32 nfsd4_encode_splice_read(
4296 struct nfsd4_compoundres *resp,
4297 struct nfsd4_read *read,
4298 struct file *file, unsigned long maxcount)
4299{
4300 struct xdr_stream *xdr = resp->xdr;
4301 struct xdr_buf *buf = xdr->buf;
4302 int status, space_left;
4303 __be32 nfserr;
4304
4305 /*
4306 * Make sure there is room at the end of buf->head for
4307 * svcxdr_encode_opaque_pages() to create a tail buffer
4308 * to XDR-pad the payload.
4309 */
4310 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4311 return nfserr_resource;
4312
4313 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4314 file, read->rd_offset, &maxcount,
4315 &read->rd_eof);
4316 read->rd_length = maxcount;
4317 if (nfserr)
4318 goto out_err;
4319 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages,
4320 buf->page_base, maxcount);
4321 status = svc_encode_result_payload(read->rd_rqstp,
4322 buf->head[0].iov_len, maxcount);
4323 if (status) {
4324 nfserr = nfserrno(status);
4325 goto out_err;
4326 }
4327
4328 /*
4329 * Prepare to encode subsequent operations.
4330 *
4331 * xdr_truncate_encode() is not safe to use after a successful
4332 * splice read has been done, so the following stream
4333 * manipulations are open-coded.
4334 */
4335 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4336 buf->buflen - buf->len);
4337 buf->buflen = buf->len + space_left;
4338 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4339
4340 return nfs_ok;
4341
4342out_err:
4343 /*
4344 * nfsd_splice_actor may have already messed with the
4345 * page length; reset it so as not to confuse
4346 * xdr_truncate_encode in our caller.
4347 */
4348 buf->page_len = 0;
4349 return nfserr;
4350}
4351
4352static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4353 struct nfsd4_read *read,
4354 struct file *file, unsigned long maxcount)
4355{
4356 struct xdr_stream *xdr = resp->xdr;
4357 unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4358 unsigned int starting_len = xdr->buf->len;
4359 __be32 zero = xdr_zero;
4360 __be32 nfserr;
4361
4362 if (xdr_reserve_space_vec(xdr, maxcount) < 0)
4363 return nfserr_resource;
4364
4365 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file,
4366 read->rd_offset, &maxcount, base,
4367 &read->rd_eof);
4368 read->rd_length = maxcount;
4369 if (nfserr)
4370 return nfserr;
4371 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4372 return nfserr_io;
4373 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4374
4375 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4376 xdr_pad_size(maxcount));
4377 return nfs_ok;
4378}
4379
4380static __be32
4381nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4382 union nfsd4_op_u *u)
4383{
4384 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
4385 struct nfsd4_read *read = &u->read;
4386 struct xdr_stream *xdr = resp->xdr;
4387 int starting_len = xdr->buf->len;
4388 bool splice_ok = argp->splice_ok;
4389 unsigned long maxcount;
4390 struct file *file;
4391 __be32 *p;
4392
4393 if (nfserr)
4394 return nfserr;
4395 file = read->rd_nf->nf_file;
4396
4397 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4398 if (!p) {
4399 WARN_ON_ONCE(splice_ok);
4400 return nfserr_resource;
4401 }
4402 if (resp->xdr->buf->page_len && splice_ok) {
4403 WARN_ON_ONCE(1);
4404 return nfserr_serverfault;
4405 }
4406 xdr_commit_encode(xdr);
4407
4408 maxcount = min_t(unsigned long, read->rd_length,
4409 (xdr->buf->buflen - xdr->buf->len));
4410
4411 if (file->f_op->splice_read && splice_ok)
4412 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4413 else
4414 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4415 if (nfserr) {
4416 xdr_truncate_encode(xdr, starting_len);
4417 return nfserr;
4418 }
4419
4420 p = xdr_encode_bool(p, read->rd_eof);
4421 *p = cpu_to_be32(read->rd_length);
4422 return nfs_ok;
4423}
4424
4425static __be32
4426nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4427 union nfsd4_op_u *u)
4428{
4429 struct nfsd4_readlink *readlink = &u->readlink;
4430 __be32 *p, *maxcount_p, zero = xdr_zero;
4431 struct xdr_stream *xdr = resp->xdr;
4432 int length_offset = xdr->buf->len;
4433 int maxcount, status;
4434
4435 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4436 if (!maxcount_p)
4437 return nfserr_resource;
4438 maxcount = PAGE_SIZE;
4439
4440 p = xdr_reserve_space(xdr, maxcount);
4441 if (!p)
4442 return nfserr_resource;
4443 /*
4444 * XXX: By default, vfs_readlink() will truncate symlinks if they
4445 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4446 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4447 * that truncation occurred, and return NFS4ERR_RESOURCE.
4448 */
4449 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4450 (char *)p, &maxcount);
4451 if (nfserr == nfserr_isdir)
4452 nfserr = nfserr_inval;
4453 if (nfserr)
4454 goto out_err;
4455 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4456 maxcount);
4457 if (status) {
4458 nfserr = nfserrno(status);
4459 goto out_err;
4460 }
4461 *maxcount_p = cpu_to_be32(maxcount);
4462 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4463 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4464 xdr_pad_size(maxcount));
4465 return nfs_ok;
4466
4467out_err:
4468 xdr_truncate_encode(xdr, length_offset);
4469 return nfserr;
4470}
4471
4472static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4473 struct nfsd4_readdir *readdir,
4474 u32 max_payload)
4475{
4476 int bytes_left, maxcount, starting_len = xdr->buf->len;
4477 loff_t offset;
4478 __be32 status;
4479
4480 /*
4481 * Number of bytes left for directory entries allowing for the
4482 * final 8 bytes of the readdir and a following failed op.
4483 */
4484 bytes_left = xdr->buf->buflen - xdr->buf->len -
4485 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4486 if (bytes_left < 0)
4487 return nfserr_resource;
4488 maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4489
4490 /*
4491 * The RFC defines rd_maxcount as the size of the
4492 * READDIR4resok structure, which includes the verifier
4493 * and the 8 bytes encoded at the end of this function.
4494 */
4495 if (maxcount < XDR_UNIT * 4)
4496 return nfserr_toosmall;
4497 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4498
4499 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4500 if (!readdir->rd_dircount)
4501 readdir->rd_dircount = max_payload;
4502
4503 /* *entries */
4504 readdir->xdr = xdr;
4505 readdir->rd_maxcount = maxcount;
4506 readdir->common.err = 0;
4507 readdir->cookie_offset = 0;
4508 offset = readdir->rd_cookie;
4509 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4510 &readdir->common, nfsd4_encode_entry4);
4511 if (status)
4512 return status;
4513 if (readdir->common.err == nfserr_toosmall &&
4514 xdr->buf->len == starting_len) {
4515 /* No entries were encoded. Which limit did we hit? */
4516 if (maxcount - XDR_UNIT * 4 < bytes_left)
4517 /* It was the fault of rd_maxcount */
4518 return nfserr_toosmall;
4519 /* We ran out of buffer space */
4520 return nfserr_resource;
4521 }
4522 /* Encode the final entry's cookie value */
4523 nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4524 /* No entries follow */
4525 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4526 return nfserr_resource;
4527
4528 /* eof */
4529 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof);
4530}
4531
4532static __be32
4533nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4534 union nfsd4_op_u *u)
4535{
4536 struct nfsd4_readdir *readdir = &u->readdir;
4537 struct xdr_stream *xdr = resp->xdr;
4538 int starting_len = xdr->buf->len;
4539
4540 /* cookieverf */
4541 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf);
4542 if (nfserr != nfs_ok)
4543 return nfserr;
4544
4545 /* reply */
4546 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp));
4547 if (nfserr != nfs_ok)
4548 xdr_truncate_encode(xdr, starting_len);
4549 return nfserr;
4550}
4551
4552static __be32
4553nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4554 union nfsd4_op_u *u)
4555{
4556 struct nfsd4_remove *remove = &u->remove;
4557 struct xdr_stream *xdr = resp->xdr;
4558
4559 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo);
4560}
4561
4562static __be32
4563nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4564 union nfsd4_op_u *u)
4565{
4566 struct nfsd4_rename *rename = &u->rename;
4567 struct xdr_stream *xdr = resp->xdr;
4568
4569 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo);
4570 if (nfserr)
4571 return nfserr;
4572 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo);
4573}
4574
4575static __be32
4576nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4577 struct rpcsec_gss_info *info)
4578{
4579 __be32 status;
4580
4581 /* oid */
4582 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0)
4583 return nfserr_resource;
4584 /* qop */
4585 status = nfsd4_encode_qop4(xdr, info->qop);
4586 if (status != nfs_ok)
4587 return status;
4588 /* service */
4589 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT)
4590 return nfserr_resource;
4591
4592 return nfs_ok;
4593}
4594
4595static __be32
4596nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4597{
4598 u32 i, nflavs, supported;
4599 struct exp_flavor_info *flavs;
4600 struct exp_flavor_info def_flavs[2];
4601 static bool report = true;
4602 __be32 *flavorsp;
4603 __be32 status;
4604
4605 if (exp->ex_nflavors) {
4606 flavs = exp->ex_flavors;
4607 nflavs = exp->ex_nflavors;
4608 } else { /* Handling of some defaults in absence of real secinfo: */
4609 flavs = def_flavs;
4610 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4611 nflavs = 2;
4612 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4613 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4614 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4615 nflavs = 1;
4616 flavs[0].pseudoflavor
4617 = svcauth_gss_flavor(exp->ex_client);
4618 } else {
4619 nflavs = 1;
4620 flavs[0].pseudoflavor
4621 = exp->ex_client->flavour->flavour;
4622 }
4623 }
4624
4625 supported = 0;
4626 flavorsp = xdr_reserve_space(xdr, XDR_UNIT);
4627 if (!flavorsp)
4628 return nfserr_resource;
4629
4630 for (i = 0; i < nflavs; i++) {
4631 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4632 struct rpcsec_gss_info info;
4633
4634 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4635 supported++;
4636
4637 /* flavor */
4638 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS);
4639 if (status != nfs_ok)
4640 return status;
4641 /* flavor_info */
4642 status = nfsd4_encode_rpcsec_gss_info(xdr, &info);
4643 if (status != nfs_ok)
4644 return status;
4645 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4646 supported++;
4647
4648 /* flavor */
4649 status = nfsd4_encode_uint32_t(xdr, pf);
4650 if (status != nfs_ok)
4651 return status;
4652 } else {
4653 if (report)
4654 pr_warn("NFS: SECINFO: security flavor %u "
4655 "is not supported\n", pf);
4656 }
4657 }
4658
4659 if (nflavs != supported)
4660 report = false;
4661 *flavorsp = cpu_to_be32(supported);
4662 return 0;
4663}
4664
4665static __be32
4666nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4667 union nfsd4_op_u *u)
4668{
4669 struct nfsd4_secinfo *secinfo = &u->secinfo;
4670 struct xdr_stream *xdr = resp->xdr;
4671
4672 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4673}
4674
4675static __be32
4676nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4677 union nfsd4_op_u *u)
4678{
4679 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4680 struct xdr_stream *xdr = resp->xdr;
4681
4682 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4683}
4684
4685static __be32
4686nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4687 union nfsd4_op_u *u)
4688{
4689 struct nfsd4_setattr *setattr = &u->setattr;
4690 __be32 status;
4691
4692 switch (nfserr) {
4693 case nfs_ok:
4694 /* attrsset */
4695 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0],
4696 setattr->sa_bmval[1],
4697 setattr->sa_bmval[2]);
4698 break;
4699 default:
4700 /* attrsset */
4701 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0);
4702 }
4703 return status != nfs_ok ? status : nfserr;
4704}
4705
4706static __be32
4707nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4708 union nfsd4_op_u *u)
4709{
4710 struct nfsd4_setclientid *scd = &u->setclientid;
4711 struct xdr_stream *xdr = resp->xdr;
4712
4713 if (!nfserr) {
4714 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid);
4715 if (nfserr != nfs_ok)
4716 goto out;
4717 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm);
4718 } else if (nfserr == nfserr_clid_inuse) {
4719 /* empty network id */
4720 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4721 nfserr = nfserr_resource;
4722 goto out;
4723 }
4724 /* empty universal address */
4725 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4726 nfserr = nfserr_resource;
4727 goto out;
4728 }
4729 }
4730out:
4731 return nfserr;
4732}
4733
4734static __be32
4735nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4736 union nfsd4_op_u *u)
4737{
4738 struct nfsd4_write *write = &u->write;
4739 struct xdr_stream *xdr = resp->xdr;
4740
4741 /* count */
4742 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4743 if (nfserr)
4744 return nfserr;
4745 /* committed */
4746 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT)
4747 return nfserr_resource;
4748 /* writeverf */
4749 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
4750}
4751
4752static __be32
4753nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4754 struct nfsd4_exchange_id *exid)
4755{
4756 __be32 status;
4757
4758 /* spo_must_enforce */
4759 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0],
4760 exid->spo_must_enforce[1],
4761 exid->spo_must_enforce[2]);
4762 if (status != nfs_ok)
4763 return status;
4764 /* spo_must_allow */
4765 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0],
4766 exid->spo_must_allow[1],
4767 exid->spo_must_allow[2]);
4768}
4769
4770static __be32
4771nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4772{
4773 __be32 status;
4774
4775 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT)
4776 return nfserr_resource;
4777 switch (exid->spa_how) {
4778 case SP4_NONE:
4779 status = nfs_ok;
4780 break;
4781 case SP4_MACH_CRED:
4782 /* spr_mach_ops */
4783 status = nfsd4_encode_state_protect_ops4(xdr, exid);
4784 break;
4785 default:
4786 status = nfserr_serverfault;
4787 }
4788 return status;
4789}
4790
4791static __be32
4792nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4793{
4794 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4795 __be32 status;
4796
4797 /* so_minor_id */
4798 status = nfsd4_encode_uint64_t(xdr, 0);
4799 if (status != nfs_ok)
4800 return status;
4801 /* so_major_id */
4802 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name));
4803}
4804
4805static __be32
4806nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4807 union nfsd4_op_u *u)
4808{
4809 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4810 struct nfsd4_exchange_id *exid = &u->exchange_id;
4811 struct xdr_stream *xdr = resp->xdr;
4812
4813 /* eir_clientid */
4814 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid);
4815 if (nfserr != nfs_ok)
4816 return nfserr;
4817 /* eir_sequenceid */
4818 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4819 if (nfserr != nfs_ok)
4820 return nfserr;
4821 /* eir_flags */
4822 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags);
4823 if (nfserr != nfs_ok)
4824 return nfserr;
4825 /* eir_state_protect */
4826 nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4827 if (nfserr != nfs_ok)
4828 return nfserr;
4829 /* eir_server_owner */
4830 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp);
4831 if (nfserr != nfs_ok)
4832 return nfserr;
4833 /* eir_server_scope */
4834 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name,
4835 strlen(nn->nfsd_name));
4836 if (nfserr != nfs_ok)
4837 return nfserr;
4838 /* eir_server_impl_id<1> */
4839 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4840 return nfserr_resource;
4841
4842 return nfs_ok;
4843}
4844
4845static __be32
4846nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4847 const struct nfsd4_channel_attrs *attrs)
4848{
4849 __be32 status;
4850
4851 /* ca_headerpadsize */
4852 status = nfsd4_encode_count4(xdr, 0);
4853 if (status != nfs_ok)
4854 return status;
4855 /* ca_maxrequestsize */
4856 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4857 if (status != nfs_ok)
4858 return status;
4859 /* ca_maxresponsesize */
4860 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4861 if (status != nfs_ok)
4862 return status;
4863 /* ca_maxresponsesize_cached */
4864 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4865 if (status != nfs_ok)
4866 return status;
4867 /* ca_maxoperations */
4868 status = nfsd4_encode_count4(xdr, attrs->maxops);
4869 if (status != nfs_ok)
4870 return status;
4871 /* ca_maxrequests */
4872 status = nfsd4_encode_count4(xdr, attrs->maxreqs);
4873 if (status != nfs_ok)
4874 return status;
4875 /* ca_rdma_ird<1> */
4876 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT)
4877 return nfserr_resource;
4878 if (attrs->nr_rdma_attrs)
4879 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs);
4880 return nfs_ok;
4881}
4882
4883static __be32
4884nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4885 union nfsd4_op_u *u)
4886{
4887 struct nfsd4_create_session *sess = &u->create_session;
4888 struct xdr_stream *xdr = resp->xdr;
4889
4890 /* csr_sessionid */
4891 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid);
4892 if (nfserr != nfs_ok)
4893 return nfserr;
4894 /* csr_sequence */
4895 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
4896 if (nfserr != nfs_ok)
4897 return nfserr;
4898 /* csr_flags */
4899 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags);
4900 if (nfserr != nfs_ok)
4901 return nfserr;
4902 /* csr_fore_chan_attrs */
4903 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel);
4904 if (nfserr != nfs_ok)
4905 return nfserr;
4906 /* csr_back_chan_attrs */
4907 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel);
4908}
4909
4910static __be32
4911nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4912 union nfsd4_op_u *u)
4913{
4914 struct nfsd4_sequence *seq = &u->sequence;
4915 struct xdr_stream *xdr = resp->xdr;
4916
4917 /* sr_sessionid */
4918 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid);
4919 if (nfserr != nfs_ok)
4920 return nfserr;
4921 /* sr_sequenceid */
4922 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
4923 if (nfserr != nfs_ok)
4924 return nfserr;
4925 /* sr_slotid */
4926 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
4927 if (nfserr != nfs_ok)
4928 return nfserr;
4929 /* Note slotid's are numbered from zero: */
4930 /* sr_highest_slotid */
4931 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4932 if (nfserr != nfs_ok)
4933 return nfserr;
4934 /* sr_target_highest_slotid */
4935 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4936 if (nfserr != nfs_ok)
4937 return nfserr;
4938 /* sr_status_flags */
4939 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags);
4940 if (nfserr != nfs_ok)
4941 return nfserr;
4942
4943 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4944 return nfs_ok;
4945}
4946
4947static __be32
4948nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4949 union nfsd4_op_u *u)
4950{
4951 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4952 struct nfsd4_test_stateid_id *stateid, *next;
4953 struct xdr_stream *xdr = resp->xdr;
4954
4955 /* tsr_status_codes<> */
4956 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT)
4957 return nfserr_resource;
4958 list_for_each_entry_safe(stateid, next,
4959 &test_stateid->ts_stateid_list, ts_id_list) {
4960 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT)
4961 return nfserr_resource;
4962 }
4963 return nfs_ok;
4964}
4965
4966#ifdef CONFIG_NFSD_PNFS
4967static __be32
4968nfsd4_encode_device_addr4(struct xdr_stream *xdr,
4969 const struct nfsd4_getdeviceinfo *gdev)
4970{
4971 u32 needed_len, starting_len = xdr->buf->len;
4972 const struct nfsd4_layout_ops *ops;
4973 __be32 status;
4974
4975 /* da_layout_type */
4976 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT)
4977 return nfserr_resource;
4978 /* da_addr_body */
4979 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4980 status = ops->encode_getdeviceinfo(xdr, gdev);
4981 if (status != nfs_ok) {
4982 /*
4983 * Don't burden the layout drivers with enforcing
4984 * gd_maxcount. Just tell the client to come back
4985 * with a bigger buffer if it's not enough.
4986 */
4987 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
4988 goto toosmall;
4989 return status;
4990 }
4991
4992 return nfs_ok;
4993
4994toosmall:
4995 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
4996 xdr_truncate_encode(xdr, starting_len);
4997
4998 status = nfsd4_encode_count4(xdr, needed_len);
4999 if (status != nfs_ok)
5000 return status;
5001 return nfserr_toosmall;
5002}
5003
5004static __be32
5005nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5006 union nfsd4_op_u *u)
5007{
5008 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5009 struct xdr_stream *xdr = resp->xdr;
5010
5011 /* gdir_device_addr */
5012 nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5013 if (nfserr)
5014 return nfserr;
5015 /* gdir_notification */
5016 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0);
5017}
5018
5019static __be32
5020nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5021{
5022 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5023 __be32 status;
5024
5025 /* lo_offset */
5026 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5027 if (status != nfs_ok)
5028 return status;
5029 /* lo_length */
5030 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5031 if (status != nfs_ok)
5032 return status;
5033 /* lo_iomode */
5034 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT)
5035 return nfserr_resource;
5036 /* lo_content */
5037 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT)
5038 return nfserr_resource;
5039 return ops->encode_layoutget(xdr, lgp);
5040}
5041
5042static __be32
5043nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5044 union nfsd4_op_u *u)
5045{
5046 struct nfsd4_layoutget *lgp = &u->layoutget;
5047 struct xdr_stream *xdr = resp->xdr;
5048
5049 /* logr_return_on_close */
5050 nfserr = nfsd4_encode_bool(xdr, true);
5051 if (nfserr != nfs_ok)
5052 return nfserr;
5053 /* logr_stateid */
5054 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid);
5055 if (nfserr != nfs_ok)
5056 return nfserr;
5057 /* logr_layout<> */
5058 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5059 return nfserr_resource;
5060 return nfsd4_encode_layout4(xdr, lgp);
5061}
5062
5063static __be32
5064nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5065 union nfsd4_op_u *u)
5066{
5067 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5068 struct xdr_stream *xdr = resp->xdr;
5069
5070 /* ns_sizechanged */
5071 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg);
5072 if (nfserr != nfs_ok)
5073 return nfserr;
5074 if (lcp->lc_size_chg)
5075 /* ns_size */
5076 return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5077 return nfs_ok;
5078}
5079
5080static __be32
5081nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5082 union nfsd4_op_u *u)
5083{
5084 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5085 struct xdr_stream *xdr = resp->xdr;
5086
5087 /* lrs_present */
5088 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present);
5089 if (nfserr != nfs_ok)
5090 return nfserr;
5091 if (lrp->lrs_present)
5092 /* lrs_stateid */
5093 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid);
5094 return nfs_ok;
5095}
5096#endif /* CONFIG_NFSD_PNFS */
5097
5098static __be32
5099nfsd4_encode_write_response4(struct xdr_stream *xdr,
5100 const struct nfsd4_copy *copy)
5101{
5102 const struct nfsd42_write_res *write = ©->cp_res;
5103 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5104 __be32 status;
5105
5106 /* wr_callback_id<1> */
5107 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT)
5108 return nfserr_resource;
5109 if (count) {
5110 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid);
5111 if (status != nfs_ok)
5112 return status;
5113 }
5114
5115 /* wr_count */
5116 status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5117 if (status != nfs_ok)
5118 return status;
5119 /* wr_committed */
5120 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT)
5121 return nfserr_resource;
5122 /* wr_writeverf */
5123 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
5124}
5125
5126static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5127 const struct nfsd4_copy *copy)
5128{
5129 __be32 status;
5130
5131 /* cr_consecutive */
5132 status = nfsd4_encode_bool(xdr, true);
5133 if (status != nfs_ok)
5134 return status;
5135 /* cr_synchronous */
5136 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy));
5137}
5138
5139static __be32
5140nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5141 union nfsd4_op_u *u)
5142{
5143 struct nfsd4_copy *copy = &u->copy;
5144
5145 nfserr = nfsd4_encode_write_response4(resp->xdr, copy);
5146 if (nfserr != nfs_ok)
5147 return nfserr;
5148 return nfsd4_encode_copy_requirements4(resp->xdr, copy);
5149}
5150
5151static __be32
5152nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5153{
5154 __be32 status;
5155
5156 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT)
5157 return nfserr_resource;
5158 switch (ns->nl4_type) {
5159 case NL4_NETADDR:
5160 /* nl_addr */
5161 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr);
5162 break;
5163 default:
5164 status = nfserr_serverfault;
5165 }
5166 return status;
5167}
5168
5169static __be32
5170nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5171 union nfsd4_op_u *u)
5172{
5173 struct nfsd4_copy_notify *cn = &u->copy_notify;
5174 struct xdr_stream *xdr = resp->xdr;
5175
5176 /* cnr_lease_time */
5177 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time);
5178 if (nfserr)
5179 return nfserr;
5180 /* cnr_stateid */
5181 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid);
5182 if (nfserr)
5183 return nfserr;
5184 /* cnr_source_server<> */
5185 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5186 return nfserr_resource;
5187 return nfsd4_encode_netloc4(xdr, cn->cpn_src);
5188}
5189
5190static __be32
5191nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5192 union nfsd4_op_u *u)
5193{
5194 struct nfsd4_offload_status *os = &u->offload_status;
5195 struct xdr_stream *xdr = resp->xdr;
5196
5197 /* osr_count */
5198 nfserr = nfsd4_encode_length4(xdr, os->count);
5199 if (nfserr != nfs_ok)
5200 return nfserr;
5201 /* osr_complete<1> */
5202 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
5203 return nfserr_resource;
5204 return nfs_ok;
5205}
5206
5207static __be32
5208nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5209 struct nfsd4_read *read)
5210{
5211 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
5212 struct file *file = read->rd_nf->nf_file;
5213 struct xdr_stream *xdr = resp->xdr;
5214 bool splice_ok = argp->splice_ok;
5215 unsigned long maxcount;
5216 __be32 nfserr, *p;
5217
5218 /* Content type, offset, byte count */
5219 p = xdr_reserve_space(xdr, 4 + 8 + 4);
5220 if (!p)
5221 return nfserr_io;
5222 if (resp->xdr->buf->page_len && splice_ok) {
5223 WARN_ON_ONCE(splice_ok);
5224 return nfserr_serverfault;
5225 }
5226
5227 maxcount = min_t(unsigned long, read->rd_length,
5228 (xdr->buf->buflen - xdr->buf->len));
5229
5230 if (file->f_op->splice_read && splice_ok)
5231 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5232 else
5233 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5234 if (nfserr)
5235 return nfserr;
5236
5237 *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
5238 p = xdr_encode_hyper(p, read->rd_offset);
5239 *p = cpu_to_be32(read->rd_length);
5240
5241 return nfs_ok;
5242}
5243
5244static __be32
5245nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5246 union nfsd4_op_u *u)
5247{
5248 struct nfsd4_read *read = &u->read;
5249 struct file *file = read->rd_nf->nf_file;
5250 struct xdr_stream *xdr = resp->xdr;
5251 int starting_len = xdr->buf->len;
5252 u32 segments = 0;
5253 __be32 *p;
5254
5255 if (nfserr)
5256 return nfserr;
5257
5258 /* eof flag, segment count */
5259 p = xdr_reserve_space(xdr, 4 + 4);
5260 if (!p)
5261 return nfserr_io;
5262 xdr_commit_encode(xdr);
5263
5264 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
5265 if (read->rd_eof)
5266 goto out;
5267
5268 nfserr = nfsd4_encode_read_plus_data(resp, read);
5269 if (nfserr) {
5270 xdr_truncate_encode(xdr, starting_len);
5271 return nfserr;
5272 }
5273
5274 segments++;
5275
5276out:
5277 p = xdr_encode_bool(p, read->rd_eof);
5278 *p = cpu_to_be32(segments);
5279 return nfserr;
5280}
5281
5282static __be32
5283nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5284 union nfsd4_op_u *u)
5285{
5286 struct nfsd4_seek *seek = &u->seek;
5287 struct xdr_stream *xdr = resp->xdr;
5288
5289 /* sr_eof */
5290 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof);
5291 if (nfserr != nfs_ok)
5292 return nfserr;
5293 /* sr_offset */
5294 return nfsd4_encode_offset4(xdr, seek->seek_pos);
5295}
5296
5297static __be32
5298nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5299 union nfsd4_op_u *p)
5300{
5301 return nfserr;
5302}
5303
5304/*
5305 * Encode kmalloc-ed buffer in to XDR stream.
5306 */
5307static __be32
5308nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5309{
5310 u32 cplen;
5311 __be32 *p;
5312
5313 cplen = min_t(unsigned long, buflen,
5314 ((void *)xdr->end - (void *)xdr->p));
5315 p = xdr_reserve_space(xdr, cplen);
5316 if (!p)
5317 return nfserr_resource;
5318
5319 memcpy(p, buf, cplen);
5320 buf += cplen;
5321 buflen -= cplen;
5322
5323 while (buflen) {
5324 cplen = min_t(u32, buflen, PAGE_SIZE);
5325 p = xdr_reserve_space(xdr, cplen);
5326 if (!p)
5327 return nfserr_resource;
5328
5329 memcpy(p, buf, cplen);
5330
5331 if (cplen < PAGE_SIZE) {
5332 /*
5333 * We're done, with a length that wasn't page
5334 * aligned, so possibly not word aligned. Pad
5335 * any trailing bytes with 0.
5336 */
5337 xdr_encode_opaque_fixed(p, NULL, cplen);
5338 break;
5339 }
5340
5341 buflen -= PAGE_SIZE;
5342 buf += PAGE_SIZE;
5343 }
5344
5345 return 0;
5346}
5347
5348static __be32
5349nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5350 union nfsd4_op_u *u)
5351{
5352 struct nfsd4_getxattr *getxattr = &u->getxattr;
5353 struct xdr_stream *xdr = resp->xdr;
5354 __be32 *p, err;
5355
5356 p = xdr_reserve_space(xdr, 4);
5357 if (!p)
5358 return nfserr_resource;
5359
5360 *p = cpu_to_be32(getxattr->getxa_len);
5361
5362 if (getxattr->getxa_len == 0)
5363 return 0;
5364
5365 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5366 getxattr->getxa_len);
5367
5368 kvfree(getxattr->getxa_buf);
5369
5370 return err;
5371}
5372
5373static __be32
5374nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5375 union nfsd4_op_u *u)
5376{
5377 struct nfsd4_setxattr *setxattr = &u->setxattr;
5378 struct xdr_stream *xdr = resp->xdr;
5379
5380 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo);
5381}
5382
5383/*
5384 * See if there are cookie values that can be rejected outright.
5385 */
5386static __be32
5387nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5388 u32 *offsetp)
5389{
5390 u64 cookie = listxattrs->lsxa_cookie;
5391
5392 /*
5393 * If the cookie is larger than the maximum number we can fit
5394 * in the buffer we just got back from vfs_listxattr, it's invalid.
5395 */
5396 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5397 return nfserr_badcookie;
5398
5399 *offsetp = (u32)cookie;
5400 return 0;
5401}
5402
5403static __be32
5404nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5405 union nfsd4_op_u *u)
5406{
5407 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5408 struct xdr_stream *xdr = resp->xdr;
5409 u32 cookie_offset, count_offset, eof;
5410 u32 left, xdrleft, slen, count;
5411 u32 xdrlen, offset;
5412 u64 cookie;
5413 char *sp;
5414 __be32 status, tmp;
5415 __be64 wire_cookie;
5416 __be32 *p;
5417 u32 nuser;
5418
5419 eof = 1;
5420
5421 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5422 if (status)
5423 goto out;
5424
5425 /*
5426 * Reserve space for the cookie and the name array count. Record
5427 * the offsets to save them later.
5428 */
5429 cookie_offset = xdr->buf->len;
5430 count_offset = cookie_offset + 8;
5431 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
5432 if (!p) {
5433 status = nfserr_resource;
5434 goto out;
5435 }
5436
5437 count = 0;
5438 left = listxattrs->lsxa_len;
5439 sp = listxattrs->lsxa_buf;
5440 nuser = 0;
5441
5442 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */
5443 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3;
5444
5445 while (left > 0 && xdrleft > 0) {
5446 slen = strlen(sp);
5447
5448 /*
5449 * Check if this is a "user." attribute, skip it if not.
5450 */
5451 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5452 goto contloop;
5453
5454 slen -= XATTR_USER_PREFIX_LEN;
5455 xdrlen = 4 + ((slen + 3) & ~3);
5456 /* Check if both entry and eof can fit in the XDR buffer */
5457 if (xdrlen + XDR_UNIT > xdrleft) {
5458 if (count == 0) {
5459 /*
5460 * Can't even fit the first attribute name.
5461 */
5462 status = nfserr_toosmall;
5463 goto out;
5464 }
5465 eof = 0;
5466 goto wreof;
5467 }
5468
5469 left -= XATTR_USER_PREFIX_LEN;
5470 sp += XATTR_USER_PREFIX_LEN;
5471 if (nuser++ < offset)
5472 goto contloop;
5473
5474
5475 p = xdr_reserve_space(xdr, xdrlen);
5476 if (!p) {
5477 status = nfserr_resource;
5478 goto out;
5479 }
5480
5481 xdr_encode_opaque(p, sp, slen);
5482
5483 xdrleft -= xdrlen;
5484 count++;
5485contloop:
5486 sp += slen + 1;
5487 left -= slen + 1;
5488 }
5489
5490 /*
5491 * If there were user attributes to copy, but we didn't copy
5492 * any, the offset was too large (e.g. the cookie was invalid).
5493 */
5494 if (nuser > 0 && count == 0) {
5495 status = nfserr_badcookie;
5496 goto out;
5497 }
5498
5499wreof:
5500 p = xdr_reserve_space(xdr, 4);
5501 if (!p) {
5502 status = nfserr_resource;
5503 goto out;
5504 }
5505 *p = cpu_to_be32(eof);
5506
5507 cookie = offset + count;
5508
5509 wire_cookie = cpu_to_be64(cookie);
5510 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8);
5511 tmp = cpu_to_be32(count);
5512 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5513out:
5514 if (listxattrs->lsxa_len)
5515 kvfree(listxattrs->lsxa_buf);
5516 return status;
5517}
5518
5519static __be32
5520nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5521 union nfsd4_op_u *u)
5522{
5523 struct nfsd4_removexattr *removexattr = &u->removexattr;
5524 struct xdr_stream *xdr = resp->xdr;
5525
5526 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo);
5527}
5528
5529typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5530
5531/*
5532 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5533 * since we don't need to filter out obsolete ops as this is
5534 * done in the decoding phase.
5535 */
5536static const nfsd4_enc nfsd4_enc_ops[] = {
5537 [OP_ACCESS] = nfsd4_encode_access,
5538 [OP_CLOSE] = nfsd4_encode_close,
5539 [OP_COMMIT] = nfsd4_encode_commit,
5540 [OP_CREATE] = nfsd4_encode_create,
5541 [OP_DELEGPURGE] = nfsd4_encode_noop,
5542 [OP_DELEGRETURN] = nfsd4_encode_noop,
5543 [OP_GETATTR] = nfsd4_encode_getattr,
5544 [OP_GETFH] = nfsd4_encode_getfh,
5545 [OP_LINK] = nfsd4_encode_link,
5546 [OP_LOCK] = nfsd4_encode_lock,
5547 [OP_LOCKT] = nfsd4_encode_lockt,
5548 [OP_LOCKU] = nfsd4_encode_locku,
5549 [OP_LOOKUP] = nfsd4_encode_noop,
5550 [OP_LOOKUPP] = nfsd4_encode_noop,
5551 [OP_NVERIFY] = nfsd4_encode_noop,
5552 [OP_OPEN] = nfsd4_encode_open,
5553 [OP_OPENATTR] = nfsd4_encode_noop,
5554 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5555 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5556 [OP_PUTFH] = nfsd4_encode_noop,
5557 [OP_PUTPUBFH] = nfsd4_encode_noop,
5558 [OP_PUTROOTFH] = nfsd4_encode_noop,
5559 [OP_READ] = nfsd4_encode_read,
5560 [OP_READDIR] = nfsd4_encode_readdir,
5561 [OP_READLINK] = nfsd4_encode_readlink,
5562 [OP_REMOVE] = nfsd4_encode_remove,
5563 [OP_RENAME] = nfsd4_encode_rename,
5564 [OP_RENEW] = nfsd4_encode_noop,
5565 [OP_RESTOREFH] = nfsd4_encode_noop,
5566 [OP_SAVEFH] = nfsd4_encode_noop,
5567 [OP_SECINFO] = nfsd4_encode_secinfo,
5568 [OP_SETATTR] = nfsd4_encode_setattr,
5569 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5570 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5571 [OP_VERIFY] = nfsd4_encode_noop,
5572 [OP_WRITE] = nfsd4_encode_write,
5573 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5574
5575 /* NFSv4.1 operations */
5576 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5577 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5578 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5579 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5580 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5581 [OP_FREE_STATEID] = nfsd4_encode_noop,
5582 [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5583#ifdef CONFIG_NFSD_PNFS
5584 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5585 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5586 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5587 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5588 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5589#else
5590 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5591 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5592 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5593 [OP_LAYOUTGET] = nfsd4_encode_noop,
5594 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
5595#endif
5596 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5597 [OP_SEQUENCE] = nfsd4_encode_sequence,
5598 [OP_SET_SSV] = nfsd4_encode_noop,
5599 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5600 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5601 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5602 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5603
5604 /* NFSv4.2 operations */
5605 [OP_ALLOCATE] = nfsd4_encode_noop,
5606 [OP_COPY] = nfsd4_encode_copy,
5607 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5608 [OP_DEALLOCATE] = nfsd4_encode_noop,
5609 [OP_IO_ADVISE] = nfsd4_encode_noop,
5610 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5611 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5612 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5613 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5614 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5615 [OP_SEEK] = nfsd4_encode_seek,
5616 [OP_WRITE_SAME] = nfsd4_encode_noop,
5617 [OP_CLONE] = nfsd4_encode_noop,
5618
5619 /* RFC 8276 extended atributes operations */
5620 [OP_GETXATTR] = nfsd4_encode_getxattr,
5621 [OP_SETXATTR] = nfsd4_encode_setxattr,
5622 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5623 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5624};
5625
5626/*
5627 * Calculate whether we still have space to encode repsize bytes.
5628 * There are two considerations:
5629 * - For NFS versions >=4.1, the size of the reply must stay within
5630 * session limits
5631 * - For all NFS versions, we must stay within limited preallocated
5632 * buffer space.
5633 *
5634 * This is called before the operation is processed, so can only provide
5635 * an upper estimate. For some nonidempotent operations (such as
5636 * getattr), it's not necessarily a problem if that estimate is wrong,
5637 * as we can fail it after processing without significant side effects.
5638 */
5639__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5640{
5641 struct xdr_buf *buf = &resp->rqstp->rq_res;
5642 struct nfsd4_slot *slot = resp->cstate.slot;
5643
5644 if (buf->len + respsize <= buf->buflen)
5645 return nfs_ok;
5646 if (!nfsd4_has_session(&resp->cstate))
5647 return nfserr_resource;
5648 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5649 WARN_ON_ONCE(1);
5650 return nfserr_rep_too_big_to_cache;
5651 }
5652 return nfserr_rep_too_big;
5653}
5654
5655void
5656nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5657{
5658 struct xdr_stream *xdr = resp->xdr;
5659 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5660 struct svc_rqst *rqstp = resp->rqstp;
5661 const struct nfsd4_operation *opdesc = op->opdesc;
5662 int post_err_offset;
5663 nfsd4_enc encoder;
5664 __be32 *p;
5665
5666 p = xdr_reserve_space(xdr, 8);
5667 if (!p)
5668 goto release;
5669 *p++ = cpu_to_be32(op->opnum);
5670 post_err_offset = xdr->buf->len;
5671
5672 if (op->opnum == OP_ILLEGAL)
5673 goto status;
5674 if (op->status && opdesc &&
5675 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5676 goto status;
5677 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5678 !nfsd4_enc_ops[op->opnum]);
5679 encoder = nfsd4_enc_ops[op->opnum];
5680 op->status = encoder(resp, op->status, &op->u);
5681 if (op->status)
5682 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5683 xdr_commit_encode(xdr);
5684
5685 /* nfsd4_check_resp_size guarantees enough room for error status */
5686 if (!op->status) {
5687 int space_needed = 0;
5688 if (!nfsd4_last_compound_op(rqstp))
5689 space_needed = COMPOUND_ERR_SLACK_SPACE;
5690 op->status = nfsd4_check_resp_size(resp, space_needed);
5691 }
5692 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5693 struct nfsd4_slot *slot = resp->cstate.slot;
5694
5695 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5696 op->status = nfserr_rep_too_big_to_cache;
5697 else
5698 op->status = nfserr_rep_too_big;
5699 }
5700 if (op->status == nfserr_resource ||
5701 op->status == nfserr_rep_too_big ||
5702 op->status == nfserr_rep_too_big_to_cache) {
5703 /*
5704 * The operation may have already been encoded or
5705 * partially encoded. No op returns anything additional
5706 * in the case of one of these three errors, so we can
5707 * just truncate back to after the status. But it's a
5708 * bug if we had to do this on a non-idempotent op:
5709 */
5710 warn_on_nonidempotent_op(op);
5711 xdr_truncate_encode(xdr, post_err_offset);
5712 }
5713 if (so) {
5714 int len = xdr->buf->len - post_err_offset;
5715
5716 so->so_replay.rp_status = op->status;
5717 so->so_replay.rp_buflen = len;
5718 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5719 so->so_replay.rp_buf, len);
5720 }
5721status:
5722 *p = op->status;
5723release:
5724 if (opdesc && opdesc->op_release)
5725 opdesc->op_release(&op->u);
5726
5727 /*
5728 * Account for pages consumed while encoding this operation.
5729 * The xdr_stream primitives don't manage rq_next_page.
5730 */
5731 rqstp->rq_next_page = xdr->page_ptr + 1;
5732}
5733
5734/**
5735 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache
5736 * @xdr: send buffer's XDR stream
5737 * @op: operation being replayed
5738 *
5739 * @op->replay->rp_buf contains the previously-sent already-encoded result.
5740 */
5741void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5742{
5743 struct nfs4_replay *rp = op->replay;
5744
5745 trace_nfsd_stateowner_replay(op->opnum, rp);
5746
5747 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT)
5748 return;
5749 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT)
5750 return;
5751 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen);
5752}
5753
5754void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5755{
5756 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5757
5758 if (args->ops != args->iops) {
5759 vfree(args->ops);
5760 args->ops = args->iops;
5761 }
5762 while (args->to_free) {
5763 struct svcxdr_tmpbuf *tb = args->to_free;
5764 args->to_free = tb->next;
5765 kfree(tb);
5766 }
5767}
5768
5769bool
5770nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5771{
5772 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5773
5774 /* svcxdr_tmp_alloc */
5775 args->to_free = NULL;
5776
5777 args->xdr = xdr;
5778 args->ops = args->iops;
5779 args->rqstp = rqstp;
5780
5781 return nfsd4_decode_compound(args);
5782}
5783
5784bool
5785nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5786{
5787 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5788 __be32 *p;
5789
5790 /*
5791 * Send buffer space for the following items is reserved
5792 * at the top of nfsd4_proc_compound().
5793 */
5794 p = resp->statusp;
5795
5796 *p++ = resp->cstate.status;
5797 *p++ = htonl(resp->taglen);
5798 memcpy(p, resp->tag, resp->taglen);
5799 p += XDR_QUADLEN(resp->taglen);
5800 *p++ = htonl(resp->opcnt);
5801
5802 nfsd4_sequence_done(resp);
5803 return true;
5804}