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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 <uapi/linux/xattr.h>
46
47#include "idmap.h"
48#include "acl.h"
49#include "xdr4.h"
50#include "vfs.h"
51#include "state.h"
52#include "cache.h"
53#include "netns.h"
54#include "pnfs.h"
55#include "filecache.h"
56
57#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
58#include <linux/security.h>
59#endif
60
61
62#define NFSDDBG_FACILITY NFSDDBG_XDR
63
64const u32 nfsd_suppattrs[3][3] = {
65 {NFSD4_SUPPORTED_ATTRS_WORD0,
66 NFSD4_SUPPORTED_ATTRS_WORD1,
67 NFSD4_SUPPORTED_ATTRS_WORD2},
68
69 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70 NFSD4_1_SUPPORTED_ATTRS_WORD1,
71 NFSD4_1_SUPPORTED_ATTRS_WORD2},
72
73 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
74 NFSD4_1_SUPPORTED_ATTRS_WORD1,
75 NFSD4_2_SUPPORTED_ATTRS_WORD2},
76};
77
78/*
79 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
80 * directory in order to indicate to the client that a filesystem boundary is present
81 * We use a fixed fsid for a referral
82 */
83#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
84#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
85
86static __be32
87check_filename(char *str, int len)
88{
89 int i;
90
91 if (len == 0)
92 return nfserr_inval;
93 if (isdotent(str, len))
94 return nfserr_badname;
95 for (i = 0; i < len; i++)
96 if (str[i] == '/')
97 return nfserr_badname;
98 return 0;
99}
100
101#define DECODE_HEAD \
102 __be32 *p; \
103 __be32 status
104#define DECODE_TAIL \
105 status = 0; \
106out: \
107 return status; \
108xdr_error: \
109 dprintk("NFSD: xdr error (%s:%d)\n", \
110 __FILE__, __LINE__); \
111 status = nfserr_bad_xdr; \
112 goto out
113
114#define READMEM(x,nbytes) do { \
115 x = (char *)p; \
116 p += XDR_QUADLEN(nbytes); \
117} while (0)
118#define SAVEMEM(x,nbytes) do { \
119 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
120 savemem(argp, p, nbytes) : \
121 (char *)p)) { \
122 dprintk("NFSD: xdr error (%s:%d)\n", \
123 __FILE__, __LINE__); \
124 goto xdr_error; \
125 } \
126 p += XDR_QUADLEN(nbytes); \
127} while (0)
128#define COPYMEM(x,nbytes) do { \
129 memcpy((x), p, nbytes); \
130 p += XDR_QUADLEN(nbytes); \
131} while (0)
132
133/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
134#define READ_BUF(nbytes) do { \
135 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
136 p = argp->p; \
137 argp->p += XDR_QUADLEN(nbytes); \
138 } else if (!(p = read_buf(argp, nbytes))) { \
139 dprintk("NFSD: xdr error (%s:%d)\n", \
140 __FILE__, __LINE__); \
141 goto xdr_error; \
142 } \
143} while (0)
144
145static void next_decode_page(struct nfsd4_compoundargs *argp)
146{
147 argp->p = page_address(argp->pagelist[0]);
148 argp->pagelist++;
149 if (argp->pagelen < PAGE_SIZE) {
150 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
151 argp->pagelen = 0;
152 } else {
153 argp->end = argp->p + (PAGE_SIZE>>2);
154 argp->pagelen -= PAGE_SIZE;
155 }
156}
157
158static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
159{
160 /* We want more bytes than seem to be available.
161 * Maybe we need a new page, maybe we have just run out
162 */
163 unsigned int avail = (char *)argp->end - (char *)argp->p;
164 __be32 *p;
165
166 if (argp->pagelen == 0) {
167 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
168
169 if (!argp->tail) {
170 argp->tail = true;
171 avail = vec->iov_len;
172 argp->p = vec->iov_base;
173 argp->end = vec->iov_base + avail;
174 }
175
176 if (avail < nbytes)
177 return NULL;
178
179 p = argp->p;
180 argp->p += XDR_QUADLEN(nbytes);
181 return p;
182 }
183
184 if (avail + argp->pagelen < nbytes)
185 return NULL;
186 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
187 return NULL;
188 /* ok, we can do it with the current plus the next page */
189 if (nbytes <= sizeof(argp->tmp))
190 p = argp->tmp;
191 else {
192 kfree(argp->tmpp);
193 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
194 if (!p)
195 return NULL;
196
197 }
198 /*
199 * The following memcpy is safe because read_buf is always
200 * called with nbytes > avail, and the two cases above both
201 * guarantee p points to at least nbytes bytes.
202 */
203 memcpy(p, argp->p, avail);
204 next_decode_page(argp);
205 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
206 argp->p += XDR_QUADLEN(nbytes - avail);
207 return p;
208}
209
210static unsigned int compoundargs_bytes_left(struct nfsd4_compoundargs *argp)
211{
212 unsigned int this = (char *)argp->end - (char *)argp->p;
213
214 return this + argp->pagelen;
215}
216
217static int zero_clientid(clientid_t *clid)
218{
219 return (clid->cl_boot == 0) && (clid->cl_id == 0);
220}
221
222/**
223 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
224 * @argp: NFSv4 compound argument structure
225 * @len: length of buffer to allocate
226 *
227 * Allocates a buffer of size @len to be freed when processing the compound
228 * operation described in @argp finishes.
229 */
230static void *
231svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
232{
233 struct svcxdr_tmpbuf *tb;
234
235 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
236 if (!tb)
237 return NULL;
238 tb->next = argp->to_free;
239 argp->to_free = tb;
240 return tb->buf;
241}
242
243/*
244 * For xdr strings that need to be passed to other kernel api's
245 * as null-terminated strings.
246 *
247 * Note null-terminating in place usually isn't safe since the
248 * buffer might end on a page boundary.
249 */
250static char *
251svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
252{
253 char *p = svcxdr_tmpalloc(argp, len + 1);
254
255 if (!p)
256 return NULL;
257 memcpy(p, buf, len);
258 p[len] = '\0';
259 return p;
260}
261
262static __be32
263svcxdr_construct_vector(struct nfsd4_compoundargs *argp, struct kvec *head,
264 struct page ***pagelist, u32 buflen)
265{
266 int avail;
267 int len;
268 int pages;
269
270 /* Sorry .. no magic macros for this.. *
271 * READ_BUF(write->wr_buflen);
272 * SAVEMEM(write->wr_buf, write->wr_buflen);
273 */
274 avail = (char *)argp->end - (char *)argp->p;
275 if (avail + argp->pagelen < buflen) {
276 dprintk("NFSD: xdr error (%s:%d)\n",
277 __FILE__, __LINE__);
278 return nfserr_bad_xdr;
279 }
280 head->iov_base = argp->p;
281 head->iov_len = avail;
282 *pagelist = argp->pagelist;
283
284 len = XDR_QUADLEN(buflen) << 2;
285 if (len >= avail) {
286 len -= avail;
287
288 pages = len >> PAGE_SHIFT;
289 argp->pagelist += pages;
290 argp->pagelen -= pages * PAGE_SIZE;
291 len -= pages * PAGE_SIZE;
292
293 next_decode_page(argp);
294 }
295 argp->p += XDR_QUADLEN(len);
296
297 return 0;
298}
299
300/**
301 * savemem - duplicate a chunk of memory for later processing
302 * @argp: NFSv4 compound argument structure to be freed with
303 * @p: pointer to be duplicated
304 * @nbytes: length to be duplicated
305 *
306 * Returns a pointer to a copy of @nbytes bytes of memory at @p
307 * that are preserved until processing of the NFSv4 compound
308 * operation described by @argp finishes.
309 */
310static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
311{
312 void *ret;
313
314 ret = svcxdr_tmpalloc(argp, nbytes);
315 if (!ret)
316 return NULL;
317 memcpy(ret, p, nbytes);
318 return ret;
319}
320
321static __be32
322nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
323{
324 DECODE_HEAD;
325
326 READ_BUF(12);
327 p = xdr_decode_hyper(p, &tv->tv_sec);
328 tv->tv_nsec = be32_to_cpup(p++);
329 if (tv->tv_nsec >= (u32)1000000000)
330 return nfserr_inval;
331
332 DECODE_TAIL;
333}
334
335static __be32
336nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
337{
338 u32 bmlen;
339 DECODE_HEAD;
340
341 bmval[0] = 0;
342 bmval[1] = 0;
343 bmval[2] = 0;
344
345 READ_BUF(4);
346 bmlen = be32_to_cpup(p++);
347 if (bmlen > 1000)
348 goto xdr_error;
349
350 READ_BUF(bmlen << 2);
351 if (bmlen > 0)
352 bmval[0] = be32_to_cpup(p++);
353 if (bmlen > 1)
354 bmval[1] = be32_to_cpup(p++);
355 if (bmlen > 2)
356 bmval[2] = be32_to_cpup(p++);
357
358 DECODE_TAIL;
359}
360
361static __be32
362nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
363 struct iattr *iattr, struct nfs4_acl **acl,
364 struct xdr_netobj *label, int *umask)
365{
366 int expected_len, len = 0;
367 u32 dummy32;
368 char *buf;
369
370 DECODE_HEAD;
371 iattr->ia_valid = 0;
372 if ((status = nfsd4_decode_bitmap(argp, bmval)))
373 return status;
374
375 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
376 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
377 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
378 if (nfsd_attrs_supported(argp->minorversion, bmval))
379 return nfserr_inval;
380 return nfserr_attrnotsupp;
381 }
382
383 READ_BUF(4);
384 expected_len = be32_to_cpup(p++);
385
386 if (bmval[0] & FATTR4_WORD0_SIZE) {
387 READ_BUF(8);
388 len += 8;
389 p = xdr_decode_hyper(p, &iattr->ia_size);
390 iattr->ia_valid |= ATTR_SIZE;
391 }
392 if (bmval[0] & FATTR4_WORD0_ACL) {
393 u32 nace;
394 struct nfs4_ace *ace;
395
396 READ_BUF(4); len += 4;
397 nace = be32_to_cpup(p++);
398
399 if (nace > compoundargs_bytes_left(argp)/20)
400 /*
401 * Even with 4-byte names there wouldn't be
402 * space for that many aces; something fishy is
403 * going on:
404 */
405 return nfserr_fbig;
406
407 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
408 if (*acl == NULL)
409 return nfserr_jukebox;
410
411 (*acl)->naces = nace;
412 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
413 READ_BUF(16); len += 16;
414 ace->type = be32_to_cpup(p++);
415 ace->flag = be32_to_cpup(p++);
416 ace->access_mask = be32_to_cpup(p++);
417 dummy32 = be32_to_cpup(p++);
418 READ_BUF(dummy32);
419 len += XDR_QUADLEN(dummy32) << 2;
420 READMEM(buf, dummy32);
421 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
422 status = nfs_ok;
423 if (ace->whotype != NFS4_ACL_WHO_NAMED)
424 ;
425 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
426 status = nfsd_map_name_to_gid(argp->rqstp,
427 buf, dummy32, &ace->who_gid);
428 else
429 status = nfsd_map_name_to_uid(argp->rqstp,
430 buf, dummy32, &ace->who_uid);
431 if (status)
432 return status;
433 }
434 } else
435 *acl = NULL;
436 if (bmval[1] & FATTR4_WORD1_MODE) {
437 READ_BUF(4);
438 len += 4;
439 iattr->ia_mode = be32_to_cpup(p++);
440 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
441 iattr->ia_valid |= ATTR_MODE;
442 }
443 if (bmval[1] & FATTR4_WORD1_OWNER) {
444 READ_BUF(4);
445 len += 4;
446 dummy32 = be32_to_cpup(p++);
447 READ_BUF(dummy32);
448 len += (XDR_QUADLEN(dummy32) << 2);
449 READMEM(buf, dummy32);
450 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
451 return status;
452 iattr->ia_valid |= ATTR_UID;
453 }
454 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
455 READ_BUF(4);
456 len += 4;
457 dummy32 = be32_to_cpup(p++);
458 READ_BUF(dummy32);
459 len += (XDR_QUADLEN(dummy32) << 2);
460 READMEM(buf, dummy32);
461 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
462 return status;
463 iattr->ia_valid |= ATTR_GID;
464 }
465 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
466 READ_BUF(4);
467 len += 4;
468 dummy32 = be32_to_cpup(p++);
469 switch (dummy32) {
470 case NFS4_SET_TO_CLIENT_TIME:
471 len += 12;
472 status = nfsd4_decode_time(argp, &iattr->ia_atime);
473 if (status)
474 return status;
475 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
476 break;
477 case NFS4_SET_TO_SERVER_TIME:
478 iattr->ia_valid |= ATTR_ATIME;
479 break;
480 default:
481 goto xdr_error;
482 }
483 }
484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
485 READ_BUF(4);
486 len += 4;
487 dummy32 = be32_to_cpup(p++);
488 switch (dummy32) {
489 case NFS4_SET_TO_CLIENT_TIME:
490 len += 12;
491 status = nfsd4_decode_time(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 goto xdr_error;
501 }
502 }
503
504 label->len = 0;
505 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
506 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
507 READ_BUF(4);
508 len += 4;
509 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
510 READ_BUF(4);
511 len += 4;
512 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
513 READ_BUF(4);
514 len += 4;
515 dummy32 = be32_to_cpup(p++);
516 READ_BUF(dummy32);
517 if (dummy32 > NFS4_MAXLABELLEN)
518 return nfserr_badlabel;
519 len += (XDR_QUADLEN(dummy32) << 2);
520 READMEM(buf, dummy32);
521 label->len = dummy32;
522 label->data = svcxdr_dupstr(argp, buf, dummy32);
523 if (!label->data)
524 return nfserr_jukebox;
525 }
526 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
527 if (!umask)
528 goto xdr_error;
529 READ_BUF(8);
530 len += 8;
531 dummy32 = be32_to_cpup(p++);
532 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
533 dummy32 = be32_to_cpup(p++);
534 *umask = dummy32 & S_IRWXUGO;
535 iattr->ia_valid |= ATTR_MODE;
536 }
537 if (len != expected_len)
538 goto xdr_error;
539
540 DECODE_TAIL;
541}
542
543static __be32
544nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
545{
546 DECODE_HEAD;
547
548 READ_BUF(sizeof(stateid_t));
549 sid->si_generation = be32_to_cpup(p++);
550 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
551
552 DECODE_TAIL;
553}
554
555static __be32
556nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
557{
558 DECODE_HEAD;
559
560 READ_BUF(4);
561 access->ac_req_access = be32_to_cpup(p++);
562
563 DECODE_TAIL;
564}
565
566static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
567{
568 DECODE_HEAD;
569 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
570 u32 dummy, uid, gid;
571 char *machine_name;
572 int i;
573 int nr_secflavs;
574
575 /* callback_sec_params4 */
576 READ_BUF(4);
577 nr_secflavs = be32_to_cpup(p++);
578 if (nr_secflavs)
579 cbs->flavor = (u32)(-1);
580 else
581 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
582 cbs->flavor = 0;
583 for (i = 0; i < nr_secflavs; ++i) {
584 READ_BUF(4);
585 dummy = be32_to_cpup(p++);
586 switch (dummy) {
587 case RPC_AUTH_NULL:
588 /* Nothing to read */
589 if (cbs->flavor == (u32)(-1))
590 cbs->flavor = RPC_AUTH_NULL;
591 break;
592 case RPC_AUTH_UNIX:
593 READ_BUF(8);
594 /* stamp */
595 dummy = be32_to_cpup(p++);
596
597 /* machine name */
598 dummy = be32_to_cpup(p++);
599 READ_BUF(dummy);
600 SAVEMEM(machine_name, dummy);
601
602 /* uid, gid */
603 READ_BUF(8);
604 uid = be32_to_cpup(p++);
605 gid = be32_to_cpup(p++);
606
607 /* more gids */
608 READ_BUF(4);
609 dummy = be32_to_cpup(p++);
610 READ_BUF(dummy * 4);
611 if (cbs->flavor == (u32)(-1)) {
612 kuid_t kuid = make_kuid(userns, uid);
613 kgid_t kgid = make_kgid(userns, gid);
614 if (uid_valid(kuid) && gid_valid(kgid)) {
615 cbs->uid = kuid;
616 cbs->gid = kgid;
617 cbs->flavor = RPC_AUTH_UNIX;
618 } else {
619 dprintk("RPC_AUTH_UNIX with invalid"
620 "uid or gid ignoring!\n");
621 }
622 }
623 break;
624 case RPC_AUTH_GSS:
625 dprintk("RPC_AUTH_GSS callback secflavor "
626 "not supported!\n");
627 READ_BUF(8);
628 /* gcbp_service */
629 dummy = be32_to_cpup(p++);
630 /* gcbp_handle_from_server */
631 dummy = be32_to_cpup(p++);
632 READ_BUF(dummy);
633 p += XDR_QUADLEN(dummy);
634 /* gcbp_handle_from_client */
635 READ_BUF(4);
636 dummy = be32_to_cpup(p++);
637 READ_BUF(dummy);
638 break;
639 default:
640 dprintk("Illegal callback secflavor\n");
641 return nfserr_inval;
642 }
643 }
644 DECODE_TAIL;
645}
646
647static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
648{
649 DECODE_HEAD;
650
651 READ_BUF(4);
652 bc->bc_cb_program = be32_to_cpup(p++);
653 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
654
655 DECODE_TAIL;
656}
657
658static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
659{
660 DECODE_HEAD;
661
662 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
663 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
664 bcts->dir = be32_to_cpup(p++);
665 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
666 * could help us figure out we should be using it. */
667 DECODE_TAIL;
668}
669
670static __be32
671nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
672{
673 DECODE_HEAD;
674
675 READ_BUF(4);
676 close->cl_seqid = be32_to_cpup(p++);
677 return nfsd4_decode_stateid(argp, &close->cl_stateid);
678
679 DECODE_TAIL;
680}
681
682
683static __be32
684nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
685{
686 DECODE_HEAD;
687
688 READ_BUF(12);
689 p = xdr_decode_hyper(p, &commit->co_offset);
690 commit->co_count = be32_to_cpup(p++);
691
692 DECODE_TAIL;
693}
694
695static __be32
696nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
697{
698 DECODE_HEAD;
699
700 READ_BUF(4);
701 create->cr_type = be32_to_cpup(p++);
702 switch (create->cr_type) {
703 case NF4LNK:
704 READ_BUF(4);
705 create->cr_datalen = be32_to_cpup(p++);
706 READ_BUF(create->cr_datalen);
707 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
708 if (!create->cr_data)
709 return nfserr_jukebox;
710 break;
711 case NF4BLK:
712 case NF4CHR:
713 READ_BUF(8);
714 create->cr_specdata1 = be32_to_cpup(p++);
715 create->cr_specdata2 = be32_to_cpup(p++);
716 break;
717 case NF4SOCK:
718 case NF4FIFO:
719 case NF4DIR:
720 default:
721 break;
722 }
723
724 READ_BUF(4);
725 create->cr_namelen = be32_to_cpup(p++);
726 READ_BUF(create->cr_namelen);
727 SAVEMEM(create->cr_name, create->cr_namelen);
728 if ((status = check_filename(create->cr_name, create->cr_namelen)))
729 return status;
730
731 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
732 &create->cr_acl, &create->cr_label,
733 &create->cr_umask);
734 if (status)
735 goto out;
736
737 DECODE_TAIL;
738}
739
740static inline __be32
741nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
742{
743 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
744}
745
746static inline __be32
747nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
748{
749 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
750}
751
752static __be32
753nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
754{
755 DECODE_HEAD;
756
757 READ_BUF(4);
758 link->li_namelen = be32_to_cpup(p++);
759 READ_BUF(link->li_namelen);
760 SAVEMEM(link->li_name, link->li_namelen);
761 if ((status = check_filename(link->li_name, link->li_namelen)))
762 return status;
763
764 DECODE_TAIL;
765}
766
767static __be32
768nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
769{
770 DECODE_HEAD;
771
772 /*
773 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
774 */
775 READ_BUF(28);
776 lock->lk_type = be32_to_cpup(p++);
777 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
778 goto xdr_error;
779 lock->lk_reclaim = be32_to_cpup(p++);
780 p = xdr_decode_hyper(p, &lock->lk_offset);
781 p = xdr_decode_hyper(p, &lock->lk_length);
782 lock->lk_is_new = be32_to_cpup(p++);
783
784 if (lock->lk_is_new) {
785 READ_BUF(4);
786 lock->lk_new_open_seqid = be32_to_cpup(p++);
787 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
788 if (status)
789 return status;
790 READ_BUF(8 + sizeof(clientid_t));
791 lock->lk_new_lock_seqid = be32_to_cpup(p++);
792 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
793 lock->lk_new_owner.len = be32_to_cpup(p++);
794 READ_BUF(lock->lk_new_owner.len);
795 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
796 } else {
797 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
798 if (status)
799 return status;
800 READ_BUF(4);
801 lock->lk_old_lock_seqid = be32_to_cpup(p++);
802 }
803
804 DECODE_TAIL;
805}
806
807static __be32
808nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
809{
810 DECODE_HEAD;
811
812 READ_BUF(32);
813 lockt->lt_type = be32_to_cpup(p++);
814 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
815 goto xdr_error;
816 p = xdr_decode_hyper(p, &lockt->lt_offset);
817 p = xdr_decode_hyper(p, &lockt->lt_length);
818 COPYMEM(&lockt->lt_clientid, 8);
819 lockt->lt_owner.len = be32_to_cpup(p++);
820 READ_BUF(lockt->lt_owner.len);
821 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
822
823 DECODE_TAIL;
824}
825
826static __be32
827nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
828{
829 DECODE_HEAD;
830
831 READ_BUF(8);
832 locku->lu_type = be32_to_cpup(p++);
833 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
834 goto xdr_error;
835 locku->lu_seqid = be32_to_cpup(p++);
836 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
837 if (status)
838 return status;
839 READ_BUF(16);
840 p = xdr_decode_hyper(p, &locku->lu_offset);
841 p = xdr_decode_hyper(p, &locku->lu_length);
842
843 DECODE_TAIL;
844}
845
846static __be32
847nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
848{
849 DECODE_HEAD;
850
851 READ_BUF(4);
852 lookup->lo_len = be32_to_cpup(p++);
853 READ_BUF(lookup->lo_len);
854 SAVEMEM(lookup->lo_name, lookup->lo_len);
855 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
856 return status;
857
858 DECODE_TAIL;
859}
860
861static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
862{
863 __be32 *p;
864 u32 w;
865
866 READ_BUF(4);
867 w = be32_to_cpup(p++);
868 *share_access = w & NFS4_SHARE_ACCESS_MASK;
869 *deleg_want = w & NFS4_SHARE_WANT_MASK;
870 if (deleg_when)
871 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
872
873 switch (w & NFS4_SHARE_ACCESS_MASK) {
874 case NFS4_SHARE_ACCESS_READ:
875 case NFS4_SHARE_ACCESS_WRITE:
876 case NFS4_SHARE_ACCESS_BOTH:
877 break;
878 default:
879 return nfserr_bad_xdr;
880 }
881 w &= ~NFS4_SHARE_ACCESS_MASK;
882 if (!w)
883 return nfs_ok;
884 if (!argp->minorversion)
885 return nfserr_bad_xdr;
886 switch (w & NFS4_SHARE_WANT_MASK) {
887 case NFS4_SHARE_WANT_NO_PREFERENCE:
888 case NFS4_SHARE_WANT_READ_DELEG:
889 case NFS4_SHARE_WANT_WRITE_DELEG:
890 case NFS4_SHARE_WANT_ANY_DELEG:
891 case NFS4_SHARE_WANT_NO_DELEG:
892 case NFS4_SHARE_WANT_CANCEL:
893 break;
894 default:
895 return nfserr_bad_xdr;
896 }
897 w &= ~NFS4_SHARE_WANT_MASK;
898 if (!w)
899 return nfs_ok;
900
901 if (!deleg_when) /* open_downgrade */
902 return nfserr_inval;
903 switch (w) {
904 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
905 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
906 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
907 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
908 return nfs_ok;
909 }
910xdr_error:
911 return nfserr_bad_xdr;
912}
913
914static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
915{
916 __be32 *p;
917
918 READ_BUF(4);
919 *x = be32_to_cpup(p++);
920 /* Note: unlinke access bits, deny bits may be zero. */
921 if (*x & ~NFS4_SHARE_DENY_BOTH)
922 return nfserr_bad_xdr;
923 return nfs_ok;
924xdr_error:
925 return nfserr_bad_xdr;
926}
927
928static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
929{
930 __be32 *p;
931
932 READ_BUF(4);
933 o->len = be32_to_cpup(p++);
934
935 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
936 return nfserr_bad_xdr;
937
938 READ_BUF(o->len);
939 SAVEMEM(o->data, o->len);
940 return nfs_ok;
941xdr_error:
942 return nfserr_bad_xdr;
943}
944
945static __be32
946nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
947{
948 DECODE_HEAD;
949 u32 dummy;
950
951 memset(open->op_bmval, 0, sizeof(open->op_bmval));
952 open->op_iattr.ia_valid = 0;
953 open->op_openowner = NULL;
954
955 open->op_xdr_error = 0;
956 /* seqid, share_access, share_deny, clientid, ownerlen */
957 READ_BUF(4);
958 open->op_seqid = be32_to_cpup(p++);
959 /* decode, yet ignore deleg_when until supported */
960 status = nfsd4_decode_share_access(argp, &open->op_share_access,
961 &open->op_deleg_want, &dummy);
962 if (status)
963 goto xdr_error;
964 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
965 if (status)
966 goto xdr_error;
967 READ_BUF(sizeof(clientid_t));
968 COPYMEM(&open->op_clientid, sizeof(clientid_t));
969 status = nfsd4_decode_opaque(argp, &open->op_owner);
970 if (status)
971 goto xdr_error;
972 READ_BUF(4);
973 open->op_create = be32_to_cpup(p++);
974 switch (open->op_create) {
975 case NFS4_OPEN_NOCREATE:
976 break;
977 case NFS4_OPEN_CREATE:
978 READ_BUF(4);
979 open->op_createmode = be32_to_cpup(p++);
980 switch (open->op_createmode) {
981 case NFS4_CREATE_UNCHECKED:
982 case NFS4_CREATE_GUARDED:
983 status = nfsd4_decode_fattr(argp, open->op_bmval,
984 &open->op_iattr, &open->op_acl, &open->op_label,
985 &open->op_umask);
986 if (status)
987 goto out;
988 break;
989 case NFS4_CREATE_EXCLUSIVE:
990 READ_BUF(NFS4_VERIFIER_SIZE);
991 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
992 break;
993 case NFS4_CREATE_EXCLUSIVE4_1:
994 if (argp->minorversion < 1)
995 goto xdr_error;
996 READ_BUF(NFS4_VERIFIER_SIZE);
997 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
998 status = nfsd4_decode_fattr(argp, open->op_bmval,
999 &open->op_iattr, &open->op_acl, &open->op_label,
1000 &open->op_umask);
1001 if (status)
1002 goto out;
1003 break;
1004 default:
1005 goto xdr_error;
1006 }
1007 break;
1008 default:
1009 goto xdr_error;
1010 }
1011
1012 /* open_claim */
1013 READ_BUF(4);
1014 open->op_claim_type = be32_to_cpup(p++);
1015 switch (open->op_claim_type) {
1016 case NFS4_OPEN_CLAIM_NULL:
1017 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1018 READ_BUF(4);
1019 open->op_fname.len = be32_to_cpup(p++);
1020 READ_BUF(open->op_fname.len);
1021 SAVEMEM(open->op_fname.data, open->op_fname.len);
1022 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
1023 return status;
1024 break;
1025 case NFS4_OPEN_CLAIM_PREVIOUS:
1026 READ_BUF(4);
1027 open->op_delegate_type = be32_to_cpup(p++);
1028 break;
1029 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1030 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1031 if (status)
1032 return status;
1033 READ_BUF(4);
1034 open->op_fname.len = be32_to_cpup(p++);
1035 READ_BUF(open->op_fname.len);
1036 SAVEMEM(open->op_fname.data, open->op_fname.len);
1037 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
1038 return status;
1039 break;
1040 case NFS4_OPEN_CLAIM_FH:
1041 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1042 if (argp->minorversion < 1)
1043 goto xdr_error;
1044 /* void */
1045 break;
1046 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1047 if (argp->minorversion < 1)
1048 goto xdr_error;
1049 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1050 if (status)
1051 return status;
1052 break;
1053 default:
1054 goto xdr_error;
1055 }
1056
1057 DECODE_TAIL;
1058}
1059
1060static __be32
1061nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1062{
1063 DECODE_HEAD;
1064
1065 if (argp->minorversion >= 1)
1066 return nfserr_notsupp;
1067
1068 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1069 if (status)
1070 return status;
1071 READ_BUF(4);
1072 open_conf->oc_seqid = be32_to_cpup(p++);
1073
1074 DECODE_TAIL;
1075}
1076
1077static __be32
1078nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1079{
1080 DECODE_HEAD;
1081
1082 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1083 if (status)
1084 return status;
1085 READ_BUF(4);
1086 open_down->od_seqid = be32_to_cpup(p++);
1087 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1088 &open_down->od_deleg_want, NULL);
1089 if (status)
1090 return status;
1091 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1092 if (status)
1093 return status;
1094 DECODE_TAIL;
1095}
1096
1097static __be32
1098nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1099{
1100 DECODE_HEAD;
1101
1102 READ_BUF(4);
1103 putfh->pf_fhlen = be32_to_cpup(p++);
1104 if (putfh->pf_fhlen > NFS4_FHSIZE)
1105 goto xdr_error;
1106 READ_BUF(putfh->pf_fhlen);
1107 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1108
1109 DECODE_TAIL;
1110}
1111
1112static __be32
1113nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1114{
1115 if (argp->minorversion == 0)
1116 return nfs_ok;
1117 return nfserr_notsupp;
1118}
1119
1120static __be32
1121nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1122{
1123 DECODE_HEAD;
1124
1125 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1126 if (status)
1127 return status;
1128 READ_BUF(12);
1129 p = xdr_decode_hyper(p, &read->rd_offset);
1130 read->rd_length = be32_to_cpup(p++);
1131
1132 DECODE_TAIL;
1133}
1134
1135static __be32
1136nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1137{
1138 DECODE_HEAD;
1139
1140 READ_BUF(24);
1141 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1142 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1143 readdir->rd_dircount = be32_to_cpup(p++);
1144 readdir->rd_maxcount = be32_to_cpup(p++);
1145 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1146 goto out;
1147
1148 DECODE_TAIL;
1149}
1150
1151static __be32
1152nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1153{
1154 DECODE_HEAD;
1155
1156 READ_BUF(4);
1157 remove->rm_namelen = be32_to_cpup(p++);
1158 READ_BUF(remove->rm_namelen);
1159 SAVEMEM(remove->rm_name, remove->rm_namelen);
1160 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1161 return status;
1162
1163 DECODE_TAIL;
1164}
1165
1166static __be32
1167nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1168{
1169 DECODE_HEAD;
1170
1171 READ_BUF(4);
1172 rename->rn_snamelen = be32_to_cpup(p++);
1173 READ_BUF(rename->rn_snamelen);
1174 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1175 READ_BUF(4);
1176 rename->rn_tnamelen = be32_to_cpup(p++);
1177 READ_BUF(rename->rn_tnamelen);
1178 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1179 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1180 return status;
1181 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1182 return status;
1183
1184 DECODE_TAIL;
1185}
1186
1187static __be32
1188nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1189{
1190 DECODE_HEAD;
1191
1192 if (argp->minorversion >= 1)
1193 return nfserr_notsupp;
1194
1195 READ_BUF(sizeof(clientid_t));
1196 COPYMEM(clientid, sizeof(clientid_t));
1197
1198 DECODE_TAIL;
1199}
1200
1201static __be32
1202nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1203 struct nfsd4_secinfo *secinfo)
1204{
1205 DECODE_HEAD;
1206
1207 READ_BUF(4);
1208 secinfo->si_namelen = be32_to_cpup(p++);
1209 READ_BUF(secinfo->si_namelen);
1210 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1211 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1212 if (status)
1213 return status;
1214 DECODE_TAIL;
1215}
1216
1217static __be32
1218nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1219 struct nfsd4_secinfo_no_name *sin)
1220{
1221 DECODE_HEAD;
1222
1223 READ_BUF(4);
1224 sin->sin_style = be32_to_cpup(p++);
1225 DECODE_TAIL;
1226}
1227
1228static __be32
1229nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1230{
1231 __be32 status;
1232
1233 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1234 if (status)
1235 return status;
1236 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1237 &setattr->sa_acl, &setattr->sa_label, NULL);
1238}
1239
1240static __be32
1241nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1242{
1243 DECODE_HEAD;
1244
1245 if (argp->minorversion >= 1)
1246 return nfserr_notsupp;
1247
1248 READ_BUF(NFS4_VERIFIER_SIZE);
1249 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1250
1251 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1252 if (status)
1253 return nfserr_bad_xdr;
1254 READ_BUF(8);
1255 setclientid->se_callback_prog = be32_to_cpup(p++);
1256 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1257 READ_BUF(setclientid->se_callback_netid_len);
1258 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1259 READ_BUF(4);
1260 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1261
1262 READ_BUF(setclientid->se_callback_addr_len);
1263 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1264 READ_BUF(4);
1265 setclientid->se_callback_ident = be32_to_cpup(p++);
1266
1267 DECODE_TAIL;
1268}
1269
1270static __be32
1271nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1272{
1273 DECODE_HEAD;
1274
1275 if (argp->minorversion >= 1)
1276 return nfserr_notsupp;
1277
1278 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1279 COPYMEM(&scd_c->sc_clientid, 8);
1280 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1281
1282 DECODE_TAIL;
1283}
1284
1285/* Also used for NVERIFY */
1286static __be32
1287nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1288{
1289 DECODE_HEAD;
1290
1291 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1292 goto out;
1293
1294 /* For convenience's sake, we compare raw xdr'd attributes in
1295 * nfsd4_proc_verify */
1296
1297 READ_BUF(4);
1298 verify->ve_attrlen = be32_to_cpup(p++);
1299 READ_BUF(verify->ve_attrlen);
1300 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1301
1302 DECODE_TAIL;
1303}
1304
1305static __be32
1306nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1307{
1308 DECODE_HEAD;
1309
1310 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1311 if (status)
1312 return status;
1313 READ_BUF(16);
1314 p = xdr_decode_hyper(p, &write->wr_offset);
1315 write->wr_stable_how = be32_to_cpup(p++);
1316 if (write->wr_stable_how > NFS_FILE_SYNC)
1317 goto xdr_error;
1318 write->wr_buflen = be32_to_cpup(p++);
1319
1320 status = svcxdr_construct_vector(argp, &write->wr_head,
1321 &write->wr_pagelist, write->wr_buflen);
1322 if (status)
1323 return status;
1324
1325 DECODE_TAIL;
1326}
1327
1328static __be32
1329nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1330{
1331 DECODE_HEAD;
1332
1333 if (argp->minorversion >= 1)
1334 return nfserr_notsupp;
1335
1336 READ_BUF(12);
1337 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1338 rlockowner->rl_owner.len = be32_to_cpup(p++);
1339 READ_BUF(rlockowner->rl_owner.len);
1340 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1341
1342 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1343 return nfserr_inval;
1344 DECODE_TAIL;
1345}
1346
1347static __be32
1348nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1349 struct nfsd4_exchange_id *exid)
1350{
1351 int dummy, tmp;
1352 DECODE_HEAD;
1353
1354 READ_BUF(NFS4_VERIFIER_SIZE);
1355 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1356
1357 status = nfsd4_decode_opaque(argp, &exid->clname);
1358 if (status)
1359 return nfserr_bad_xdr;
1360
1361 READ_BUF(4);
1362 exid->flags = be32_to_cpup(p++);
1363
1364 /* Ignore state_protect4_a */
1365 READ_BUF(4);
1366 exid->spa_how = be32_to_cpup(p++);
1367 switch (exid->spa_how) {
1368 case SP4_NONE:
1369 break;
1370 case SP4_MACH_CRED:
1371 /* spo_must_enforce */
1372 status = nfsd4_decode_bitmap(argp,
1373 exid->spo_must_enforce);
1374 if (status)
1375 goto out;
1376 /* spo_must_allow */
1377 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1378 if (status)
1379 goto out;
1380 break;
1381 case SP4_SSV:
1382 /* ssp_ops */
1383 READ_BUF(4);
1384 dummy = be32_to_cpup(p++);
1385 READ_BUF(dummy * 4);
1386 p += dummy;
1387
1388 READ_BUF(4);
1389 dummy = be32_to_cpup(p++);
1390 READ_BUF(dummy * 4);
1391 p += dummy;
1392
1393 /* ssp_hash_algs<> */
1394 READ_BUF(4);
1395 tmp = be32_to_cpup(p++);
1396 while (tmp--) {
1397 READ_BUF(4);
1398 dummy = be32_to_cpup(p++);
1399 READ_BUF(dummy);
1400 p += XDR_QUADLEN(dummy);
1401 }
1402
1403 /* ssp_encr_algs<> */
1404 READ_BUF(4);
1405 tmp = be32_to_cpup(p++);
1406 while (tmp--) {
1407 READ_BUF(4);
1408 dummy = be32_to_cpup(p++);
1409 READ_BUF(dummy);
1410 p += XDR_QUADLEN(dummy);
1411 }
1412
1413 /* ignore ssp_window and ssp_num_gss_handles: */
1414 READ_BUF(8);
1415 break;
1416 default:
1417 goto xdr_error;
1418 }
1419
1420 READ_BUF(4); /* nfs_impl_id4 array length */
1421 dummy = be32_to_cpup(p++);
1422
1423 if (dummy > 1)
1424 goto xdr_error;
1425
1426 if (dummy == 1) {
1427 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1428 if (status)
1429 goto xdr_error;
1430
1431 /* nii_name */
1432 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1433 if (status)
1434 goto xdr_error;
1435
1436 /* nii_date */
1437 status = nfsd4_decode_time(argp, &exid->nii_time);
1438 if (status)
1439 goto xdr_error;
1440 }
1441 DECODE_TAIL;
1442}
1443
1444static __be32
1445nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1446 struct nfsd4_create_session *sess)
1447{
1448 DECODE_HEAD;
1449
1450 READ_BUF(16);
1451 COPYMEM(&sess->clientid, 8);
1452 sess->seqid = be32_to_cpup(p++);
1453 sess->flags = be32_to_cpup(p++);
1454
1455 /* Fore channel attrs */
1456 READ_BUF(28);
1457 p++; /* headerpadsz is always 0 */
1458 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1459 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1460 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1461 sess->fore_channel.maxops = be32_to_cpup(p++);
1462 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1463 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1464 if (sess->fore_channel.nr_rdma_attrs == 1) {
1465 READ_BUF(4);
1466 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1467 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1468 dprintk("Too many fore channel attr bitmaps!\n");
1469 goto xdr_error;
1470 }
1471
1472 /* Back channel attrs */
1473 READ_BUF(28);
1474 p++; /* headerpadsz is always 0 */
1475 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1476 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1477 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1478 sess->back_channel.maxops = be32_to_cpup(p++);
1479 sess->back_channel.maxreqs = be32_to_cpup(p++);
1480 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1481 if (sess->back_channel.nr_rdma_attrs == 1) {
1482 READ_BUF(4);
1483 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1484 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1485 dprintk("Too many back channel attr bitmaps!\n");
1486 goto xdr_error;
1487 }
1488
1489 READ_BUF(4);
1490 sess->callback_prog = be32_to_cpup(p++);
1491 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1492 DECODE_TAIL;
1493}
1494
1495static __be32
1496nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1497 struct nfsd4_destroy_session *destroy_session)
1498{
1499 DECODE_HEAD;
1500 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1501 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1502
1503 DECODE_TAIL;
1504}
1505
1506static __be32
1507nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1508 struct nfsd4_free_stateid *free_stateid)
1509{
1510 DECODE_HEAD;
1511
1512 READ_BUF(sizeof(stateid_t));
1513 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1514 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1515
1516 DECODE_TAIL;
1517}
1518
1519static __be32
1520nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1521 struct nfsd4_sequence *seq)
1522{
1523 DECODE_HEAD;
1524
1525 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1526 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1527 seq->seqid = be32_to_cpup(p++);
1528 seq->slotid = be32_to_cpup(p++);
1529 seq->maxslots = be32_to_cpup(p++);
1530 seq->cachethis = be32_to_cpup(p++);
1531
1532 DECODE_TAIL;
1533}
1534
1535static __be32
1536nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1537{
1538 int i;
1539 __be32 *p, status;
1540 struct nfsd4_test_stateid_id *stateid;
1541
1542 READ_BUF(4);
1543 test_stateid->ts_num_ids = ntohl(*p++);
1544
1545 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1546
1547 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1548 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1549 if (!stateid) {
1550 status = nfserrno(-ENOMEM);
1551 goto out;
1552 }
1553
1554 INIT_LIST_HEAD(&stateid->ts_id_list);
1555 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1556
1557 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1558 if (status)
1559 goto out;
1560 }
1561
1562 status = 0;
1563out:
1564 return status;
1565xdr_error:
1566 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1567 status = nfserr_bad_xdr;
1568 goto out;
1569}
1570
1571static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1572{
1573 DECODE_HEAD;
1574
1575 READ_BUF(8);
1576 COPYMEM(&dc->clientid, 8);
1577
1578 DECODE_TAIL;
1579}
1580
1581static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1582{
1583 DECODE_HEAD;
1584
1585 READ_BUF(4);
1586 rc->rca_one_fs = be32_to_cpup(p++);
1587
1588 DECODE_TAIL;
1589}
1590
1591#ifdef CONFIG_NFSD_PNFS
1592static __be32
1593nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1594 struct nfsd4_getdeviceinfo *gdev)
1595{
1596 DECODE_HEAD;
1597 u32 num, i;
1598
1599 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1600 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1601 gdev->gd_layout_type = be32_to_cpup(p++);
1602 gdev->gd_maxcount = be32_to_cpup(p++);
1603 num = be32_to_cpup(p++);
1604 if (num) {
1605 if (num > 1000)
1606 goto xdr_error;
1607 READ_BUF(4 * num);
1608 gdev->gd_notify_types = be32_to_cpup(p++);
1609 for (i = 1; i < num; i++) {
1610 if (be32_to_cpup(p++)) {
1611 status = nfserr_inval;
1612 goto out;
1613 }
1614 }
1615 }
1616 DECODE_TAIL;
1617}
1618
1619static __be32
1620nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1621 struct nfsd4_layoutget *lgp)
1622{
1623 DECODE_HEAD;
1624
1625 READ_BUF(36);
1626 lgp->lg_signal = be32_to_cpup(p++);
1627 lgp->lg_layout_type = be32_to_cpup(p++);
1628 lgp->lg_seg.iomode = be32_to_cpup(p++);
1629 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1630 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1631 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1632
1633 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1634 if (status)
1635 return status;
1636
1637 READ_BUF(4);
1638 lgp->lg_maxcount = be32_to_cpup(p++);
1639
1640 DECODE_TAIL;
1641}
1642
1643static __be32
1644nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1645 struct nfsd4_layoutcommit *lcp)
1646{
1647 DECODE_HEAD;
1648 u32 timechange;
1649
1650 READ_BUF(20);
1651 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1652 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1653 lcp->lc_reclaim = be32_to_cpup(p++);
1654
1655 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1656 if (status)
1657 return status;
1658
1659 READ_BUF(4);
1660 lcp->lc_newoffset = be32_to_cpup(p++);
1661 if (lcp->lc_newoffset) {
1662 READ_BUF(8);
1663 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1664 } else
1665 lcp->lc_last_wr = 0;
1666 READ_BUF(4);
1667 timechange = be32_to_cpup(p++);
1668 if (timechange) {
1669 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1670 if (status)
1671 return status;
1672 } else {
1673 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1674 }
1675 READ_BUF(8);
1676 lcp->lc_layout_type = be32_to_cpup(p++);
1677
1678 /*
1679 * Save the layout update in XDR format and let the layout driver deal
1680 * with it later.
1681 */
1682 lcp->lc_up_len = be32_to_cpup(p++);
1683 if (lcp->lc_up_len > 0) {
1684 READ_BUF(lcp->lc_up_len);
1685 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1686 }
1687
1688 DECODE_TAIL;
1689}
1690
1691static __be32
1692nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1693 struct nfsd4_layoutreturn *lrp)
1694{
1695 DECODE_HEAD;
1696
1697 READ_BUF(16);
1698 lrp->lr_reclaim = be32_to_cpup(p++);
1699 lrp->lr_layout_type = be32_to_cpup(p++);
1700 lrp->lr_seg.iomode = be32_to_cpup(p++);
1701 lrp->lr_return_type = be32_to_cpup(p++);
1702 if (lrp->lr_return_type == RETURN_FILE) {
1703 READ_BUF(16);
1704 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1705 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1706
1707 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1708 if (status)
1709 return status;
1710
1711 READ_BUF(4);
1712 lrp->lrf_body_len = be32_to_cpup(p++);
1713 if (lrp->lrf_body_len > 0) {
1714 READ_BUF(lrp->lrf_body_len);
1715 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1716 }
1717 } else {
1718 lrp->lr_seg.offset = 0;
1719 lrp->lr_seg.length = NFS4_MAX_UINT64;
1720 }
1721
1722 DECODE_TAIL;
1723}
1724#endif /* CONFIG_NFSD_PNFS */
1725
1726static __be32
1727nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1728 struct nfsd4_fallocate *fallocate)
1729{
1730 DECODE_HEAD;
1731
1732 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1733 if (status)
1734 return status;
1735
1736 READ_BUF(16);
1737 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1738 xdr_decode_hyper(p, &fallocate->falloc_length);
1739
1740 DECODE_TAIL;
1741}
1742
1743static __be32
1744nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1745{
1746 DECODE_HEAD;
1747
1748 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1749 if (status)
1750 return status;
1751 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1752 if (status)
1753 return status;
1754
1755 READ_BUF(8 + 8 + 8);
1756 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1757 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1758 p = xdr_decode_hyper(p, &clone->cl_count);
1759 DECODE_TAIL;
1760}
1761
1762static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1763 struct nl4_server *ns)
1764{
1765 DECODE_HEAD;
1766 struct nfs42_netaddr *naddr;
1767
1768 READ_BUF(4);
1769 ns->nl4_type = be32_to_cpup(p++);
1770
1771 /* currently support for 1 inter-server source server */
1772 switch (ns->nl4_type) {
1773 case NL4_NETADDR:
1774 naddr = &ns->u.nl4_addr;
1775
1776 READ_BUF(4);
1777 naddr->netid_len = be32_to_cpup(p++);
1778 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1779 goto xdr_error;
1780
1781 READ_BUF(naddr->netid_len + 4); /* 4 for uaddr len */
1782 COPYMEM(naddr->netid, naddr->netid_len);
1783
1784 naddr->addr_len = be32_to_cpup(p++);
1785 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1786 goto xdr_error;
1787
1788 READ_BUF(naddr->addr_len);
1789 COPYMEM(naddr->addr, naddr->addr_len);
1790 break;
1791 default:
1792 goto xdr_error;
1793 }
1794 DECODE_TAIL;
1795}
1796
1797static __be32
1798nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1799{
1800 DECODE_HEAD;
1801 struct nl4_server *ns_dummy;
1802 int i, count;
1803
1804 status = nfsd4_decode_stateid(argp, ©->cp_src_stateid);
1805 if (status)
1806 return status;
1807 status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid);
1808 if (status)
1809 return status;
1810
1811 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1812 p = xdr_decode_hyper(p, ©->cp_src_pos);
1813 p = xdr_decode_hyper(p, ©->cp_dst_pos);
1814 p = xdr_decode_hyper(p, ©->cp_count);
1815 p++; /* ca_consecutive: we always do consecutive copies */
1816 copy->cp_synchronous = be32_to_cpup(p++);
1817
1818 count = be32_to_cpup(p++);
1819
1820 copy->cp_intra = false;
1821 if (count == 0) { /* intra-server copy */
1822 copy->cp_intra = true;
1823 goto intra;
1824 }
1825
1826 /* decode all the supplied server addresses but use first */
1827 status = nfsd4_decode_nl4_server(argp, ©->cp_src);
1828 if (status)
1829 return status;
1830
1831 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
1832 if (ns_dummy == NULL)
1833 return nfserrno(-ENOMEM);
1834 for (i = 0; i < count - 1; i++) {
1835 status = nfsd4_decode_nl4_server(argp, ns_dummy);
1836 if (status) {
1837 kfree(ns_dummy);
1838 return status;
1839 }
1840 }
1841 kfree(ns_dummy);
1842intra:
1843
1844 DECODE_TAIL;
1845}
1846
1847static __be32
1848nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
1849 struct nfsd4_offload_status *os)
1850{
1851 return nfsd4_decode_stateid(argp, &os->stateid);
1852}
1853
1854static __be32
1855nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
1856 struct nfsd4_copy_notify *cn)
1857{
1858 int status;
1859
1860 status = nfsd4_decode_stateid(argp, &cn->cpn_src_stateid);
1861 if (status)
1862 return status;
1863 return nfsd4_decode_nl4_server(argp, &cn->cpn_dst);
1864}
1865
1866static __be32
1867nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1868{
1869 DECODE_HEAD;
1870
1871 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1872 if (status)
1873 return status;
1874
1875 READ_BUF(8 + 4);
1876 p = xdr_decode_hyper(p, &seek->seek_offset);
1877 seek->seek_whence = be32_to_cpup(p);
1878
1879 DECODE_TAIL;
1880}
1881
1882/*
1883 * XDR data that is more than PAGE_SIZE in size is normally part of a
1884 * read or write. However, the size of extended attributes is limited
1885 * by the maximum request size, and then further limited by the underlying
1886 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
1887 * is 64k). Since there is no kvec- or page-based interface to xattrs,
1888 * and we're not dealing with contiguous pages, we need to do some copying.
1889 */
1890
1891/*
1892 * Decode data into buffer. Uses head and pages constructed by
1893 * svcxdr_construct_vector.
1894 */
1895static __be32
1896nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct kvec *head,
1897 struct page **pages, char **bufp, u32 buflen)
1898{
1899 char *tmp, *dp;
1900 u32 len;
1901
1902 if (buflen <= head->iov_len) {
1903 /*
1904 * We're in luck, the head has enough space. Just return
1905 * the head, no need for copying.
1906 */
1907 *bufp = head->iov_base;
1908 return 0;
1909 }
1910
1911 tmp = svcxdr_tmpalloc(argp, buflen);
1912 if (tmp == NULL)
1913 return nfserr_jukebox;
1914
1915 dp = tmp;
1916 memcpy(dp, head->iov_base, head->iov_len);
1917 buflen -= head->iov_len;
1918 dp += head->iov_len;
1919
1920 while (buflen > 0) {
1921 len = min_t(u32, buflen, PAGE_SIZE);
1922 memcpy(dp, page_address(*pages), len);
1923
1924 buflen -= len;
1925 dp += len;
1926 pages++;
1927 }
1928
1929 *bufp = tmp;
1930 return 0;
1931}
1932
1933/*
1934 * Get a user extended attribute name from the XDR buffer.
1935 * It will not have the "user." prefix, so prepend it.
1936 * Lastly, check for nul characters in the name.
1937 */
1938static __be32
1939nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
1940{
1941 DECODE_HEAD;
1942 char *name, *sp, *dp;
1943 u32 namelen, cnt;
1944
1945 READ_BUF(4);
1946 namelen = be32_to_cpup(p++);
1947
1948 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
1949 return nfserr_nametoolong;
1950
1951 if (namelen == 0)
1952 goto xdr_error;
1953
1954 READ_BUF(namelen);
1955
1956 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
1957 if (!name)
1958 return nfserr_jukebox;
1959
1960 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
1961
1962 /*
1963 * Copy the extended attribute name over while checking for 0
1964 * characters.
1965 */
1966 sp = (char *)p;
1967 dp = name + XATTR_USER_PREFIX_LEN;
1968 cnt = namelen;
1969
1970 while (cnt-- > 0) {
1971 if (*sp == '\0')
1972 goto xdr_error;
1973 *dp++ = *sp++;
1974 }
1975 *dp = '\0';
1976
1977 *namep = name;
1978
1979 DECODE_TAIL;
1980}
1981
1982/*
1983 * A GETXATTR op request comes without a length specifier. We just set the
1984 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
1985 * channel reply size. nfsd_getxattr will probe the length of the xattr,
1986 * check it against getxa_len, and allocate + return the value.
1987 */
1988static __be32
1989nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
1990 struct nfsd4_getxattr *getxattr)
1991{
1992 __be32 status;
1993 u32 maxcount;
1994
1995 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
1996 if (status)
1997 return status;
1998
1999 maxcount = svc_max_payload(argp->rqstp);
2000 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2001
2002 getxattr->getxa_len = maxcount;
2003
2004 return status;
2005}
2006
2007static __be32
2008nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2009 struct nfsd4_setxattr *setxattr)
2010{
2011 DECODE_HEAD;
2012 u32 flags, maxcount, size;
2013 struct kvec head;
2014 struct page **pagelist;
2015
2016 READ_BUF(4);
2017 flags = be32_to_cpup(p++);
2018
2019 if (flags > SETXATTR4_REPLACE)
2020 return nfserr_inval;
2021 setxattr->setxa_flags = flags;
2022
2023 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2024 if (status)
2025 return status;
2026
2027 maxcount = svc_max_payload(argp->rqstp);
2028 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2029
2030 READ_BUF(4);
2031 size = be32_to_cpup(p++);
2032 if (size > maxcount)
2033 return nfserr_xattr2big;
2034
2035 setxattr->setxa_len = size;
2036 if (size > 0) {
2037 status = svcxdr_construct_vector(argp, &head, &pagelist, size);
2038 if (status)
2039 return status;
2040
2041 status = nfsd4_vbuf_from_vector(argp, &head, pagelist,
2042 &setxattr->setxa_buf, size);
2043 }
2044
2045 DECODE_TAIL;
2046}
2047
2048static __be32
2049nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2050 struct nfsd4_listxattrs *listxattrs)
2051{
2052 DECODE_HEAD;
2053 u32 maxcount;
2054
2055 READ_BUF(12);
2056 p = xdr_decode_hyper(p, &listxattrs->lsxa_cookie);
2057
2058 /*
2059 * If the cookie is too large to have even one user.x attribute
2060 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2061 */
2062 if (listxattrs->lsxa_cookie >=
2063 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2064 return nfserr_badcookie;
2065
2066 maxcount = be32_to_cpup(p++);
2067 if (maxcount < 8)
2068 /* Always need at least 2 words (length and one character) */
2069 return nfserr_inval;
2070
2071 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2072 listxattrs->lsxa_maxcount = maxcount;
2073
2074 DECODE_TAIL;
2075}
2076
2077static __be32
2078nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2079 struct nfsd4_removexattr *removexattr)
2080{
2081 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2082}
2083
2084static __be32
2085nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
2086{
2087 return nfs_ok;
2088}
2089
2090static __be32
2091nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
2092{
2093 return nfserr_notsupp;
2094}
2095
2096typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
2097
2098static const nfsd4_dec nfsd4_dec_ops[] = {
2099 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
2100 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
2101 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
2102 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
2103 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
2104 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
2105 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
2106 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
2107 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
2108 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
2109 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
2110 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
2111 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
2112 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
2113 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
2114 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
2115 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
2116 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
2117 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
2118 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
2119 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
2120 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
2121 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
2122 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
2123 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
2124 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
2125 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
2126 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
2127 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
2128 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
2129 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
2130 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
2131 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
2132 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
2133 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
2134 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
2135 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
2136
2137 /* new operations for NFSv4.1 */
2138 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
2139 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
2140 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
2141 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
2142 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
2143 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
2144 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
2145#ifdef CONFIG_NFSD_PNFS
2146 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
2147 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
2148 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
2149 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
2150 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
2151#else
2152 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
2153 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
2154 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
2155 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
2156 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
2157#endif
2158 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
2159 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
2160 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
2161 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
2162 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
2163 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
2164 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
2165
2166 /* new operations for NFSv4.2 */
2167 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
2168 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
2169 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_copy_notify,
2170 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
2171 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
2172 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
2173 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
2174 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_offload_status,
2175 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_offload_status,
2176 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
2177 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
2178 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
2179 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
2180 /* RFC 8276 extended atributes operations */
2181 [OP_GETXATTR] = (nfsd4_dec)nfsd4_decode_getxattr,
2182 [OP_SETXATTR] = (nfsd4_dec)nfsd4_decode_setxattr,
2183 [OP_LISTXATTRS] = (nfsd4_dec)nfsd4_decode_listxattrs,
2184 [OP_REMOVEXATTR] = (nfsd4_dec)nfsd4_decode_removexattr,
2185};
2186
2187static inline bool
2188nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2189{
2190 if (op->opnum < FIRST_NFS4_OP)
2191 return false;
2192 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2193 return false;
2194 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2195 return false;
2196 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2197 return false;
2198 return true;
2199}
2200
2201static __be32
2202nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2203{
2204 DECODE_HEAD;
2205 struct nfsd4_op *op;
2206 bool cachethis = false;
2207 int auth_slack= argp->rqstp->rq_auth_slack;
2208 int max_reply = auth_slack + 8; /* opcnt, status */
2209 int readcount = 0;
2210 int readbytes = 0;
2211 int i;
2212
2213 READ_BUF(4);
2214 argp->taglen = be32_to_cpup(p++);
2215 READ_BUF(argp->taglen);
2216 SAVEMEM(argp->tag, argp->taglen);
2217 READ_BUF(8);
2218 argp->minorversion = be32_to_cpup(p++);
2219 argp->opcnt = be32_to_cpup(p++);
2220 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
2221
2222 if (argp->taglen > NFSD4_MAX_TAGLEN)
2223 goto xdr_error;
2224 /*
2225 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
2226 * here, so we return success at the xdr level so that
2227 * nfsd4_proc can handle this is an NFS-level error.
2228 */
2229 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2230 return 0;
2231
2232 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2233 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
2234 if (!argp->ops) {
2235 argp->ops = argp->iops;
2236 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
2237 goto xdr_error;
2238 }
2239 }
2240
2241 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2242 argp->opcnt = 0;
2243
2244 for (i = 0; i < argp->opcnt; i++) {
2245 op = &argp->ops[i];
2246 op->replay = NULL;
2247
2248 READ_BUF(4);
2249 op->opnum = be32_to_cpup(p++);
2250
2251 if (nfsd4_opnum_in_range(argp, op))
2252 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2253 else {
2254 op->opnum = OP_ILLEGAL;
2255 op->status = nfserr_op_illegal;
2256 }
2257 op->opdesc = OPDESC(op);
2258 /*
2259 * We'll try to cache the result in the DRC if any one
2260 * op in the compound wants to be cached:
2261 */
2262 cachethis |= nfsd4_cache_this_op(op);
2263
2264 if (op->opnum == OP_READ) {
2265 readcount++;
2266 readbytes += nfsd4_max_reply(argp->rqstp, op);
2267 } else
2268 max_reply += nfsd4_max_reply(argp->rqstp, op);
2269 /*
2270 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2271 * (Special case because it will just skip encoding this
2272 * if it runs out of xdr buffer space, and it is the only
2273 * operation that behaves this way.)
2274 */
2275 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2276 max_reply += NFS4_OPAQUE_LIMIT;
2277
2278 if (op->status) {
2279 argp->opcnt = i+1;
2280 break;
2281 }
2282 }
2283 /* Sessions make the DRC unnecessary: */
2284 if (argp->minorversion)
2285 cachethis = false;
2286 svc_reserve(argp->rqstp, max_reply + readbytes);
2287 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2288
2289 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2290 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2291
2292 DECODE_TAIL;
2293}
2294
2295static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2296 struct svc_export *exp)
2297{
2298 if (exp->ex_flags & NFSEXP_V4ROOT) {
2299 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2300 *p++ = 0;
2301 } else if (IS_I_VERSION(inode)) {
2302 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2303 } else {
2304 *p++ = cpu_to_be32(stat->ctime.tv_sec);
2305 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2306 }
2307 return p;
2308}
2309
2310/*
2311 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2312 * doesn't really care what resolution could theoretically be stored by
2313 * the filesystem.
2314 *
2315 * The client cares how close together changes can be while still
2316 * guaranteeing ctime changes. For most filesystems (which have
2317 * timestamps with nanosecond fields) that is limited by the resolution
2318 * of the time returned from current_time() (which I'm assuming to be
2319 * 1/HZ).
2320 */
2321static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2322{
2323 struct timespec64 ts;
2324 u32 ns;
2325
2326 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2327 ts = ns_to_timespec64(ns);
2328
2329 p = xdr_encode_hyper(p, ts.tv_sec);
2330 *p++ = cpu_to_be32(ts.tv_nsec);
2331
2332 return p;
2333}
2334
2335static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2336{
2337 *p++ = cpu_to_be32(c->atomic);
2338 if (c->change_supported) {
2339 p = xdr_encode_hyper(p, c->before_change);
2340 p = xdr_encode_hyper(p, c->after_change);
2341 } else {
2342 *p++ = cpu_to_be32(c->before_ctime_sec);
2343 *p++ = cpu_to_be32(c->before_ctime_nsec);
2344 *p++ = cpu_to_be32(c->after_ctime_sec);
2345 *p++ = cpu_to_be32(c->after_ctime_nsec);
2346 }
2347 return p;
2348}
2349
2350/* Encode as an array of strings the string given with components
2351 * separated @sep, escaped with esc_enter and esc_exit.
2352 */
2353static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2354 char *components, char esc_enter,
2355 char esc_exit)
2356{
2357 __be32 *p;
2358 __be32 pathlen;
2359 int pathlen_offset;
2360 int strlen, count=0;
2361 char *str, *end, *next;
2362
2363 dprintk("nfsd4_encode_components(%s)\n", components);
2364
2365 pathlen_offset = xdr->buf->len;
2366 p = xdr_reserve_space(xdr, 4);
2367 if (!p)
2368 return nfserr_resource;
2369 p++; /* We will fill this in with @count later */
2370
2371 end = str = components;
2372 while (*end) {
2373 bool found_esc = false;
2374
2375 /* try to parse as esc_start, ..., esc_end, sep */
2376 if (*str == esc_enter) {
2377 for (; *end && (*end != esc_exit); end++)
2378 /* find esc_exit or end of string */;
2379 next = end + 1;
2380 if (*end && (!*next || *next == sep)) {
2381 str++;
2382 found_esc = true;
2383 }
2384 }
2385
2386 if (!found_esc)
2387 for (; *end && (*end != sep); end++)
2388 /* find sep or end of string */;
2389
2390 strlen = end - str;
2391 if (strlen) {
2392 p = xdr_reserve_space(xdr, strlen + 4);
2393 if (!p)
2394 return nfserr_resource;
2395 p = xdr_encode_opaque(p, str, strlen);
2396 count++;
2397 }
2398 else
2399 end++;
2400 if (found_esc)
2401 end = next;
2402
2403 str = end;
2404 }
2405 pathlen = htonl(count);
2406 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2407 return 0;
2408}
2409
2410/* Encode as an array of strings the string given with components
2411 * separated @sep.
2412 */
2413static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2414 char *components)
2415{
2416 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2417}
2418
2419/*
2420 * encode a location element of a fs_locations structure
2421 */
2422static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2423 struct nfsd4_fs_location *location)
2424{
2425 __be32 status;
2426
2427 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2428 '[', ']');
2429 if (status)
2430 return status;
2431 status = nfsd4_encode_components(xdr, '/', location->path);
2432 if (status)
2433 return status;
2434 return 0;
2435}
2436
2437/*
2438 * Encode a path in RFC3530 'pathname4' format
2439 */
2440static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2441 const struct path *root,
2442 const struct path *path)
2443{
2444 struct path cur = *path;
2445 __be32 *p;
2446 struct dentry **components = NULL;
2447 unsigned int ncomponents = 0;
2448 __be32 err = nfserr_jukebox;
2449
2450 dprintk("nfsd4_encode_components(");
2451
2452 path_get(&cur);
2453 /* First walk the path up to the nfsd root, and store the
2454 * dentries/path components in an array.
2455 */
2456 for (;;) {
2457 if (path_equal(&cur, root))
2458 break;
2459 if (cur.dentry == cur.mnt->mnt_root) {
2460 if (follow_up(&cur))
2461 continue;
2462 goto out_free;
2463 }
2464 if ((ncomponents & 15) == 0) {
2465 struct dentry **new;
2466 new = krealloc(components,
2467 sizeof(*new) * (ncomponents + 16),
2468 GFP_KERNEL);
2469 if (!new)
2470 goto out_free;
2471 components = new;
2472 }
2473 components[ncomponents++] = cur.dentry;
2474 cur.dentry = dget_parent(cur.dentry);
2475 }
2476 err = nfserr_resource;
2477 p = xdr_reserve_space(xdr, 4);
2478 if (!p)
2479 goto out_free;
2480 *p++ = cpu_to_be32(ncomponents);
2481
2482 while (ncomponents) {
2483 struct dentry *dentry = components[ncomponents - 1];
2484 unsigned int len;
2485
2486 spin_lock(&dentry->d_lock);
2487 len = dentry->d_name.len;
2488 p = xdr_reserve_space(xdr, len + 4);
2489 if (!p) {
2490 spin_unlock(&dentry->d_lock);
2491 goto out_free;
2492 }
2493 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2494 dprintk("/%pd", dentry);
2495 spin_unlock(&dentry->d_lock);
2496 dput(dentry);
2497 ncomponents--;
2498 }
2499
2500 err = 0;
2501out_free:
2502 dprintk(")\n");
2503 while (ncomponents)
2504 dput(components[--ncomponents]);
2505 kfree(components);
2506 path_put(&cur);
2507 return err;
2508}
2509
2510static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2511 struct svc_rqst *rqstp, const struct path *path)
2512{
2513 struct svc_export *exp_ps;
2514 __be32 res;
2515
2516 exp_ps = rqst_find_fsidzero_export(rqstp);
2517 if (IS_ERR(exp_ps))
2518 return nfserrno(PTR_ERR(exp_ps));
2519 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2520 exp_put(exp_ps);
2521 return res;
2522}
2523
2524/*
2525 * encode a fs_locations structure
2526 */
2527static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2528 struct svc_rqst *rqstp, struct svc_export *exp)
2529{
2530 __be32 status;
2531 int i;
2532 __be32 *p;
2533 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2534
2535 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2536 if (status)
2537 return status;
2538 p = xdr_reserve_space(xdr, 4);
2539 if (!p)
2540 return nfserr_resource;
2541 *p++ = cpu_to_be32(fslocs->locations_count);
2542 for (i=0; i<fslocs->locations_count; i++) {
2543 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2544 if (status)
2545 return status;
2546 }
2547 return 0;
2548}
2549
2550static u32 nfs4_file_type(umode_t mode)
2551{
2552 switch (mode & S_IFMT) {
2553 case S_IFIFO: return NF4FIFO;
2554 case S_IFCHR: return NF4CHR;
2555 case S_IFDIR: return NF4DIR;
2556 case S_IFBLK: return NF4BLK;
2557 case S_IFLNK: return NF4LNK;
2558 case S_IFREG: return NF4REG;
2559 case S_IFSOCK: return NF4SOCK;
2560 default: return NF4BAD;
2561 };
2562}
2563
2564static inline __be32
2565nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2566 struct nfs4_ace *ace)
2567{
2568 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2569 return nfs4_acl_write_who(xdr, ace->whotype);
2570 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2571 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2572 else
2573 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2574}
2575
2576static inline __be32
2577nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2578{
2579 __be32 *p;
2580 unsigned long i = hweight_long(layout_types);
2581
2582 p = xdr_reserve_space(xdr, 4 + 4 * i);
2583 if (!p)
2584 return nfserr_resource;
2585
2586 *p++ = cpu_to_be32(i);
2587
2588 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2589 if (layout_types & (1 << i))
2590 *p++ = cpu_to_be32(i);
2591
2592 return 0;
2593}
2594
2595#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2596 FATTR4_WORD0_RDATTR_ERROR)
2597#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2598#define WORD2_ABSENT_FS_ATTRS 0
2599
2600#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2601static inline __be32
2602nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2603 void *context, int len)
2604{
2605 __be32 *p;
2606
2607 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2608 if (!p)
2609 return nfserr_resource;
2610
2611 /*
2612 * For now we use a 0 here to indicate the null translation; in
2613 * the future we may place a call to translation code here.
2614 */
2615 *p++ = cpu_to_be32(0); /* lfs */
2616 *p++ = cpu_to_be32(0); /* pi */
2617 p = xdr_encode_opaque(p, context, len);
2618 return 0;
2619}
2620#else
2621static inline __be32
2622nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2623 void *context, int len)
2624{ return 0; }
2625#endif
2626
2627static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2628{
2629 /* As per referral draft: */
2630 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2631 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2632 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2633 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2634 *rdattr_err = NFSERR_MOVED;
2635 else
2636 return nfserr_moved;
2637 }
2638 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2639 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2640 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2641 return 0;
2642}
2643
2644
2645static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2646{
2647 struct path path = exp->ex_path;
2648 int err;
2649
2650 path_get(&path);
2651 while (follow_up(&path)) {
2652 if (path.dentry != path.mnt->mnt_root)
2653 break;
2654 }
2655 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2656 path_put(&path);
2657 return err;
2658}
2659
2660static __be32
2661nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2662{
2663 __be32 *p;
2664
2665 if (bmval2) {
2666 p = xdr_reserve_space(xdr, 16);
2667 if (!p)
2668 goto out_resource;
2669 *p++ = cpu_to_be32(3);
2670 *p++ = cpu_to_be32(bmval0);
2671 *p++ = cpu_to_be32(bmval1);
2672 *p++ = cpu_to_be32(bmval2);
2673 } else if (bmval1) {
2674 p = xdr_reserve_space(xdr, 12);
2675 if (!p)
2676 goto out_resource;
2677 *p++ = cpu_to_be32(2);
2678 *p++ = cpu_to_be32(bmval0);
2679 *p++ = cpu_to_be32(bmval1);
2680 } else {
2681 p = xdr_reserve_space(xdr, 8);
2682 if (!p)
2683 goto out_resource;
2684 *p++ = cpu_to_be32(1);
2685 *p++ = cpu_to_be32(bmval0);
2686 }
2687
2688 return 0;
2689out_resource:
2690 return nfserr_resource;
2691}
2692
2693/*
2694 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2695 * ourselves.
2696 */
2697static __be32
2698nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2699 struct svc_export *exp,
2700 struct dentry *dentry, u32 *bmval,
2701 struct svc_rqst *rqstp, int ignore_crossmnt)
2702{
2703 u32 bmval0 = bmval[0];
2704 u32 bmval1 = bmval[1];
2705 u32 bmval2 = bmval[2];
2706 struct kstat stat;
2707 struct svc_fh *tempfh = NULL;
2708 struct kstatfs statfs;
2709 __be32 *p;
2710 int starting_len = xdr->buf->len;
2711 int attrlen_offset;
2712 __be32 attrlen;
2713 u32 dummy;
2714 u64 dummy64;
2715 u32 rdattr_err = 0;
2716 __be32 status;
2717 int err;
2718 struct nfs4_acl *acl = NULL;
2719#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2720 void *context = NULL;
2721 int contextlen;
2722#endif
2723 bool contextsupport = false;
2724 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2725 u32 minorversion = resp->cstate.minorversion;
2726 struct path path = {
2727 .mnt = exp->ex_path.mnt,
2728 .dentry = dentry,
2729 };
2730 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2731
2732 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2733 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2734
2735 if (exp->ex_fslocs.migrated) {
2736 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2737 if (status)
2738 goto out;
2739 }
2740
2741 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2742 if (err)
2743 goto out_nfserr;
2744 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2745 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2746 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2747 FATTR4_WORD1_SPACE_TOTAL))) {
2748 err = vfs_statfs(&path, &statfs);
2749 if (err)
2750 goto out_nfserr;
2751 }
2752 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2753 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2754 status = nfserr_jukebox;
2755 if (!tempfh)
2756 goto out;
2757 fh_init(tempfh, NFS4_FHSIZE);
2758 status = fh_compose(tempfh, exp, dentry, NULL);
2759 if (status)
2760 goto out;
2761 fhp = tempfh;
2762 }
2763 if (bmval0 & FATTR4_WORD0_ACL) {
2764 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2765 if (err == -EOPNOTSUPP)
2766 bmval0 &= ~FATTR4_WORD0_ACL;
2767 else if (err == -EINVAL) {
2768 status = nfserr_attrnotsupp;
2769 goto out;
2770 } else if (err != 0)
2771 goto out_nfserr;
2772 }
2773
2774#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2775 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2776 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2777 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2778 err = security_inode_getsecctx(d_inode(dentry),
2779 &context, &contextlen);
2780 else
2781 err = -EOPNOTSUPP;
2782 contextsupport = (err == 0);
2783 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2784 if (err == -EOPNOTSUPP)
2785 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2786 else if (err)
2787 goto out_nfserr;
2788 }
2789 }
2790#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2791
2792 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2793 if (status)
2794 goto out;
2795
2796 attrlen_offset = xdr->buf->len;
2797 p = xdr_reserve_space(xdr, 4);
2798 if (!p)
2799 goto out_resource;
2800 p++; /* to be backfilled later */
2801
2802 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2803 u32 supp[3];
2804
2805 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2806
2807 if (!IS_POSIXACL(dentry->d_inode))
2808 supp[0] &= ~FATTR4_WORD0_ACL;
2809 if (!contextsupport)
2810 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2811 if (!supp[2]) {
2812 p = xdr_reserve_space(xdr, 12);
2813 if (!p)
2814 goto out_resource;
2815 *p++ = cpu_to_be32(2);
2816 *p++ = cpu_to_be32(supp[0]);
2817 *p++ = cpu_to_be32(supp[1]);
2818 } else {
2819 p = xdr_reserve_space(xdr, 16);
2820 if (!p)
2821 goto out_resource;
2822 *p++ = cpu_to_be32(3);
2823 *p++ = cpu_to_be32(supp[0]);
2824 *p++ = cpu_to_be32(supp[1]);
2825 *p++ = cpu_to_be32(supp[2]);
2826 }
2827 }
2828 if (bmval0 & FATTR4_WORD0_TYPE) {
2829 p = xdr_reserve_space(xdr, 4);
2830 if (!p)
2831 goto out_resource;
2832 dummy = nfs4_file_type(stat.mode);
2833 if (dummy == NF4BAD) {
2834 status = nfserr_serverfault;
2835 goto out;
2836 }
2837 *p++ = cpu_to_be32(dummy);
2838 }
2839 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2840 p = xdr_reserve_space(xdr, 4);
2841 if (!p)
2842 goto out_resource;
2843 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2844 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2845 else
2846 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2847 NFS4_FH_VOL_RENAME);
2848 }
2849 if (bmval0 & FATTR4_WORD0_CHANGE) {
2850 p = xdr_reserve_space(xdr, 8);
2851 if (!p)
2852 goto out_resource;
2853 p = encode_change(p, &stat, d_inode(dentry), exp);
2854 }
2855 if (bmval0 & FATTR4_WORD0_SIZE) {
2856 p = xdr_reserve_space(xdr, 8);
2857 if (!p)
2858 goto out_resource;
2859 p = xdr_encode_hyper(p, stat.size);
2860 }
2861 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2862 p = xdr_reserve_space(xdr, 4);
2863 if (!p)
2864 goto out_resource;
2865 *p++ = cpu_to_be32(1);
2866 }
2867 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2868 p = xdr_reserve_space(xdr, 4);
2869 if (!p)
2870 goto out_resource;
2871 *p++ = cpu_to_be32(1);
2872 }
2873 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2874 p = xdr_reserve_space(xdr, 4);
2875 if (!p)
2876 goto out_resource;
2877 *p++ = cpu_to_be32(0);
2878 }
2879 if (bmval0 & FATTR4_WORD0_FSID) {
2880 p = xdr_reserve_space(xdr, 16);
2881 if (!p)
2882 goto out_resource;
2883 if (exp->ex_fslocs.migrated) {
2884 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2885 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2886 } else switch(fsid_source(fhp)) {
2887 case FSIDSOURCE_FSID:
2888 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2889 p = xdr_encode_hyper(p, (u64)0);
2890 break;
2891 case FSIDSOURCE_DEV:
2892 *p++ = cpu_to_be32(0);
2893 *p++ = cpu_to_be32(MAJOR(stat.dev));
2894 *p++ = cpu_to_be32(0);
2895 *p++ = cpu_to_be32(MINOR(stat.dev));
2896 break;
2897 case FSIDSOURCE_UUID:
2898 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2899 EX_UUID_LEN);
2900 break;
2901 }
2902 }
2903 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2904 p = xdr_reserve_space(xdr, 4);
2905 if (!p)
2906 goto out_resource;
2907 *p++ = cpu_to_be32(0);
2908 }
2909 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2910 p = xdr_reserve_space(xdr, 4);
2911 if (!p)
2912 goto out_resource;
2913 *p++ = cpu_to_be32(nn->nfsd4_lease);
2914 }
2915 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2916 p = xdr_reserve_space(xdr, 4);
2917 if (!p)
2918 goto out_resource;
2919 *p++ = cpu_to_be32(rdattr_err);
2920 }
2921 if (bmval0 & FATTR4_WORD0_ACL) {
2922 struct nfs4_ace *ace;
2923
2924 if (acl == NULL) {
2925 p = xdr_reserve_space(xdr, 4);
2926 if (!p)
2927 goto out_resource;
2928
2929 *p++ = cpu_to_be32(0);
2930 goto out_acl;
2931 }
2932 p = xdr_reserve_space(xdr, 4);
2933 if (!p)
2934 goto out_resource;
2935 *p++ = cpu_to_be32(acl->naces);
2936
2937 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2938 p = xdr_reserve_space(xdr, 4*3);
2939 if (!p)
2940 goto out_resource;
2941 *p++ = cpu_to_be32(ace->type);
2942 *p++ = cpu_to_be32(ace->flag);
2943 *p++ = cpu_to_be32(ace->access_mask &
2944 NFS4_ACE_MASK_ALL);
2945 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2946 if (status)
2947 goto out;
2948 }
2949 }
2950out_acl:
2951 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2952 p = xdr_reserve_space(xdr, 4);
2953 if (!p)
2954 goto out_resource;
2955 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2956 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2957 }
2958 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2959 p = xdr_reserve_space(xdr, 4);
2960 if (!p)
2961 goto out_resource;
2962 *p++ = cpu_to_be32(1);
2963 }
2964 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2965 p = xdr_reserve_space(xdr, 4);
2966 if (!p)
2967 goto out_resource;
2968 *p++ = cpu_to_be32(0);
2969 }
2970 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2971 p = xdr_reserve_space(xdr, 4);
2972 if (!p)
2973 goto out_resource;
2974 *p++ = cpu_to_be32(1);
2975 }
2976 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2977 p = xdr_reserve_space(xdr, 4);
2978 if (!p)
2979 goto out_resource;
2980 *p++ = cpu_to_be32(1);
2981 }
2982 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2983 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2984 if (!p)
2985 goto out_resource;
2986 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2987 fhp->fh_handle.fh_size);
2988 }
2989 if (bmval0 & FATTR4_WORD0_FILEID) {
2990 p = xdr_reserve_space(xdr, 8);
2991 if (!p)
2992 goto out_resource;
2993 p = xdr_encode_hyper(p, stat.ino);
2994 }
2995 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2996 p = xdr_reserve_space(xdr, 8);
2997 if (!p)
2998 goto out_resource;
2999 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3000 }
3001 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3002 p = xdr_reserve_space(xdr, 8);
3003 if (!p)
3004 goto out_resource;
3005 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3006 }
3007 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3008 p = xdr_reserve_space(xdr, 8);
3009 if (!p)
3010 goto out_resource;
3011 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3012 }
3013 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3014 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3015 if (status)
3016 goto out;
3017 }
3018 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3019 p = xdr_reserve_space(xdr, 4);
3020 if (!p)
3021 goto out_resource;
3022 *p++ = cpu_to_be32(1);
3023 }
3024 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3025 p = xdr_reserve_space(xdr, 8);
3026 if (!p)
3027 goto out_resource;
3028 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3029 }
3030 if (bmval0 & FATTR4_WORD0_MAXLINK) {
3031 p = xdr_reserve_space(xdr, 4);
3032 if (!p)
3033 goto out_resource;
3034 *p++ = cpu_to_be32(255);
3035 }
3036 if (bmval0 & FATTR4_WORD0_MAXNAME) {
3037 p = xdr_reserve_space(xdr, 4);
3038 if (!p)
3039 goto out_resource;
3040 *p++ = cpu_to_be32(statfs.f_namelen);
3041 }
3042 if (bmval0 & FATTR4_WORD0_MAXREAD) {
3043 p = xdr_reserve_space(xdr, 8);
3044 if (!p)
3045 goto out_resource;
3046 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3047 }
3048 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3049 p = xdr_reserve_space(xdr, 8);
3050 if (!p)
3051 goto out_resource;
3052 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3053 }
3054 if (bmval1 & FATTR4_WORD1_MODE) {
3055 p = xdr_reserve_space(xdr, 4);
3056 if (!p)
3057 goto out_resource;
3058 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3059 }
3060 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3061 p = xdr_reserve_space(xdr, 4);
3062 if (!p)
3063 goto out_resource;
3064 *p++ = cpu_to_be32(1);
3065 }
3066 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3067 p = xdr_reserve_space(xdr, 4);
3068 if (!p)
3069 goto out_resource;
3070 *p++ = cpu_to_be32(stat.nlink);
3071 }
3072 if (bmval1 & FATTR4_WORD1_OWNER) {
3073 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3074 if (status)
3075 goto out;
3076 }
3077 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3078 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3079 if (status)
3080 goto out;
3081 }
3082 if (bmval1 & FATTR4_WORD1_RAWDEV) {
3083 p = xdr_reserve_space(xdr, 8);
3084 if (!p)
3085 goto out_resource;
3086 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3087 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3088 }
3089 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3090 p = xdr_reserve_space(xdr, 8);
3091 if (!p)
3092 goto out_resource;
3093 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3094 p = xdr_encode_hyper(p, dummy64);
3095 }
3096 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3097 p = xdr_reserve_space(xdr, 8);
3098 if (!p)
3099 goto out_resource;
3100 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3101 p = xdr_encode_hyper(p, dummy64);
3102 }
3103 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3104 p = xdr_reserve_space(xdr, 8);
3105 if (!p)
3106 goto out_resource;
3107 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3108 p = xdr_encode_hyper(p, dummy64);
3109 }
3110 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3111 p = xdr_reserve_space(xdr, 8);
3112 if (!p)
3113 goto out_resource;
3114 dummy64 = (u64)stat.blocks << 9;
3115 p = xdr_encode_hyper(p, dummy64);
3116 }
3117 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3118 p = xdr_reserve_space(xdr, 12);
3119 if (!p)
3120 goto out_resource;
3121 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3122 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3123 }
3124 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3125 p = xdr_reserve_space(xdr, 12);
3126 if (!p)
3127 goto out_resource;
3128 p = encode_time_delta(p, d_inode(dentry));
3129 }
3130 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3131 p = xdr_reserve_space(xdr, 12);
3132 if (!p)
3133 goto out_resource;
3134 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3135 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3136 }
3137 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3138 p = xdr_reserve_space(xdr, 12);
3139 if (!p)
3140 goto out_resource;
3141 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3142 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3143 }
3144 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3145 struct kstat parent_stat;
3146 u64 ino = stat.ino;
3147
3148 p = xdr_reserve_space(xdr, 8);
3149 if (!p)
3150 goto out_resource;
3151 /*
3152 * Get parent's attributes if not ignoring crossmount
3153 * and this is the root of a cross-mounted filesystem.
3154 */
3155 if (ignore_crossmnt == 0 &&
3156 dentry == exp->ex_path.mnt->mnt_root) {
3157 err = get_parent_attributes(exp, &parent_stat);
3158 if (err)
3159 goto out_nfserr;
3160 ino = parent_stat.ino;
3161 }
3162 p = xdr_encode_hyper(p, ino);
3163 }
3164#ifdef CONFIG_NFSD_PNFS
3165 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3166 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3167 if (status)
3168 goto out;
3169 }
3170
3171 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3172 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3173 if (status)
3174 goto out;
3175 }
3176
3177 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3178 p = xdr_reserve_space(xdr, 4);
3179 if (!p)
3180 goto out_resource;
3181 *p++ = cpu_to_be32(stat.blksize);
3182 }
3183#endif /* CONFIG_NFSD_PNFS */
3184 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3185 u32 supp[3];
3186
3187 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3188 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3189 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3190 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3191
3192 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3193 if (status)
3194 goto out;
3195 }
3196
3197 if (bmval2 & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
3198 p = xdr_reserve_space(xdr, 4);
3199 if (!p)
3200 goto out_resource;
3201 if (IS_I_VERSION(d_inode(dentry)))
3202 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR);
3203 else
3204 *p++ = cpu_to_be32(NFS4_CHANGE_TYPE_IS_TIME_METADATA);
3205 }
3206
3207#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3208 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3209 status = nfsd4_encode_security_label(xdr, rqstp, context,
3210 contextlen);
3211 if (status)
3212 goto out;
3213 }
3214#endif
3215
3216 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3217 p = xdr_reserve_space(xdr, 4);
3218 if (!p)
3219 goto out_resource;
3220 err = xattr_supported_namespace(d_inode(dentry),
3221 XATTR_USER_PREFIX);
3222 *p++ = cpu_to_be32(err == 0);
3223 }
3224
3225 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
3226 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
3227 status = nfs_ok;
3228
3229out:
3230#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3231 if (context)
3232 security_release_secctx(context, contextlen);
3233#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3234 kfree(acl);
3235 if (tempfh) {
3236 fh_put(tempfh);
3237 kfree(tempfh);
3238 }
3239 if (status)
3240 xdr_truncate_encode(xdr, starting_len);
3241 return status;
3242out_nfserr:
3243 status = nfserrno(err);
3244 goto out;
3245out_resource:
3246 status = nfserr_resource;
3247 goto out;
3248}
3249
3250static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3251 struct xdr_buf *buf, __be32 *p, int bytes)
3252{
3253 xdr->scratch.iov_len = 0;
3254 memset(buf, 0, sizeof(struct xdr_buf));
3255 buf->head[0].iov_base = p;
3256 buf->head[0].iov_len = 0;
3257 buf->len = 0;
3258 xdr->buf = buf;
3259 xdr->iov = buf->head;
3260 xdr->p = p;
3261 xdr->end = (void *)p + bytes;
3262 buf->buflen = bytes;
3263}
3264
3265__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3266 struct svc_fh *fhp, struct svc_export *exp,
3267 struct dentry *dentry, u32 *bmval,
3268 struct svc_rqst *rqstp, int ignore_crossmnt)
3269{
3270 struct xdr_buf dummy;
3271 struct xdr_stream xdr;
3272 __be32 ret;
3273
3274 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3275 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3276 ignore_crossmnt);
3277 *p = xdr.p;
3278 return ret;
3279}
3280
3281static inline int attributes_need_mount(u32 *bmval)
3282{
3283 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3284 return 1;
3285 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3286 return 1;
3287 return 0;
3288}
3289
3290static __be32
3291nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3292 const char *name, int namlen)
3293{
3294 struct svc_export *exp = cd->rd_fhp->fh_export;
3295 struct dentry *dentry;
3296 __be32 nfserr;
3297 int ignore_crossmnt = 0;
3298
3299 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3300 if (IS_ERR(dentry))
3301 return nfserrno(PTR_ERR(dentry));
3302
3303 exp_get(exp);
3304 /*
3305 * In the case of a mountpoint, the client may be asking for
3306 * attributes that are only properties of the underlying filesystem
3307 * as opposed to the cross-mounted file system. In such a case,
3308 * we will not follow the cross mount and will fill the attribtutes
3309 * directly from the mountpoint dentry.
3310 */
3311 if (nfsd_mountpoint(dentry, exp)) {
3312 int err;
3313
3314 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3315 && !attributes_need_mount(cd->rd_bmval)) {
3316 ignore_crossmnt = 1;
3317 goto out_encode;
3318 }
3319 /*
3320 * Why the heck aren't we just using nfsd_lookup??
3321 * Different "."/".." handling? Something else?
3322 * At least, add a comment here to explain....
3323 */
3324 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3325 if (err) {
3326 nfserr = nfserrno(err);
3327 goto out_put;
3328 }
3329 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3330 if (nfserr)
3331 goto out_put;
3332
3333 }
3334out_encode:
3335 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3336 cd->rd_rqstp, ignore_crossmnt);
3337out_put:
3338 dput(dentry);
3339 exp_put(exp);
3340 return nfserr;
3341}
3342
3343static __be32 *
3344nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3345{
3346 __be32 *p;
3347
3348 p = xdr_reserve_space(xdr, 20);
3349 if (!p)
3350 return NULL;
3351 *p++ = htonl(2);
3352 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3353 *p++ = htonl(0); /* bmval1 */
3354
3355 *p++ = htonl(4); /* attribute length */
3356 *p++ = nfserr; /* no htonl */
3357 return p;
3358}
3359
3360static int
3361nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3362 loff_t offset, u64 ino, unsigned int d_type)
3363{
3364 struct readdir_cd *ccd = ccdv;
3365 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3366 struct xdr_stream *xdr = cd->xdr;
3367 int start_offset = xdr->buf->len;
3368 int cookie_offset;
3369 u32 name_and_cookie;
3370 int entry_bytes;
3371 __be32 nfserr = nfserr_toosmall;
3372 __be64 wire_offset;
3373 __be32 *p;
3374
3375 /* In nfsv4, "." and ".." never make it onto the wire.. */
3376 if (name && isdotent(name, namlen)) {
3377 cd->common.err = nfs_ok;
3378 return 0;
3379 }
3380
3381 if (cd->cookie_offset) {
3382 wire_offset = cpu_to_be64(offset);
3383 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3384 &wire_offset, 8);
3385 }
3386
3387 p = xdr_reserve_space(xdr, 4);
3388 if (!p)
3389 goto fail;
3390 *p++ = xdr_one; /* mark entry present */
3391 cookie_offset = xdr->buf->len;
3392 p = xdr_reserve_space(xdr, 3*4 + namlen);
3393 if (!p)
3394 goto fail;
3395 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3396 p = xdr_encode_array(p, name, namlen); /* name length & name */
3397
3398 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3399 switch (nfserr) {
3400 case nfs_ok:
3401 break;
3402 case nfserr_resource:
3403 nfserr = nfserr_toosmall;
3404 goto fail;
3405 case nfserr_noent:
3406 xdr_truncate_encode(xdr, start_offset);
3407 goto skip_entry;
3408 default:
3409 /*
3410 * If the client requested the RDATTR_ERROR attribute,
3411 * we stuff the error code into this attribute
3412 * and continue. If this attribute was not requested,
3413 * then in accordance with the spec, we fail the
3414 * entire READDIR operation(!)
3415 */
3416 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3417 goto fail;
3418 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3419 if (p == NULL) {
3420 nfserr = nfserr_toosmall;
3421 goto fail;
3422 }
3423 }
3424 nfserr = nfserr_toosmall;
3425 entry_bytes = xdr->buf->len - start_offset;
3426 if (entry_bytes > cd->rd_maxcount)
3427 goto fail;
3428 cd->rd_maxcount -= entry_bytes;
3429 /*
3430 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3431 * let's always let through the first entry, at least:
3432 */
3433 if (!cd->rd_dircount)
3434 goto fail;
3435 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3436 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3437 goto fail;
3438 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3439
3440 cd->cookie_offset = cookie_offset;
3441skip_entry:
3442 cd->common.err = nfs_ok;
3443 return 0;
3444fail:
3445 xdr_truncate_encode(xdr, start_offset);
3446 cd->common.err = nfserr;
3447 return -EINVAL;
3448}
3449
3450static __be32
3451nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3452{
3453 __be32 *p;
3454
3455 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3456 if (!p)
3457 return nfserr_resource;
3458 *p++ = cpu_to_be32(sid->si_generation);
3459 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3460 sizeof(stateid_opaque_t));
3461 return 0;
3462}
3463
3464static __be32
3465nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3466{
3467 struct xdr_stream *xdr = &resp->xdr;
3468 __be32 *p;
3469
3470 p = xdr_reserve_space(xdr, 8);
3471 if (!p)
3472 return nfserr_resource;
3473 *p++ = cpu_to_be32(access->ac_supported);
3474 *p++ = cpu_to_be32(access->ac_resp_access);
3475 return 0;
3476}
3477
3478static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3479{
3480 struct xdr_stream *xdr = &resp->xdr;
3481 __be32 *p;
3482
3483 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3484 if (!p)
3485 return nfserr_resource;
3486 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3487 NFS4_MAX_SESSIONID_LEN);
3488 *p++ = cpu_to_be32(bcts->dir);
3489 /* Upshifting from TCP to RDMA is not supported */
3490 *p++ = cpu_to_be32(0);
3491 return 0;
3492}
3493
3494static __be32
3495nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3496{
3497 struct xdr_stream *xdr = &resp->xdr;
3498
3499 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3500}
3501
3502
3503static __be32
3504nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3505{
3506 struct xdr_stream *xdr = &resp->xdr;
3507 __be32 *p;
3508
3509 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3510 if (!p)
3511 return nfserr_resource;
3512 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3513 NFS4_VERIFIER_SIZE);
3514 return 0;
3515}
3516
3517static __be32
3518nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3519{
3520 struct xdr_stream *xdr = &resp->xdr;
3521 __be32 *p;
3522
3523 p = xdr_reserve_space(xdr, 20);
3524 if (!p)
3525 return nfserr_resource;
3526 encode_cinfo(p, &create->cr_cinfo);
3527 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3528 create->cr_bmval[1], create->cr_bmval[2]);
3529}
3530
3531static __be32
3532nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3533{
3534 struct svc_fh *fhp = getattr->ga_fhp;
3535 struct xdr_stream *xdr = &resp->xdr;
3536
3537 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3538 getattr->ga_bmval, resp->rqstp, 0);
3539}
3540
3541static __be32
3542nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3543{
3544 struct xdr_stream *xdr = &resp->xdr;
3545 struct svc_fh *fhp = *fhpp;
3546 unsigned int len;
3547 __be32 *p;
3548
3549 len = fhp->fh_handle.fh_size;
3550 p = xdr_reserve_space(xdr, len + 4);
3551 if (!p)
3552 return nfserr_resource;
3553 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3554 return 0;
3555}
3556
3557/*
3558* Including all fields other than the name, a LOCK4denied structure requires
3559* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3560*/
3561static __be32
3562nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3563{
3564 struct xdr_netobj *conf = &ld->ld_owner;
3565 __be32 *p;
3566
3567again:
3568 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3569 if (!p) {
3570 /*
3571 * Don't fail to return the result just because we can't
3572 * return the conflicting open:
3573 */
3574 if (conf->len) {
3575 kfree(conf->data);
3576 conf->len = 0;
3577 conf->data = NULL;
3578 goto again;
3579 }
3580 return nfserr_resource;
3581 }
3582 p = xdr_encode_hyper(p, ld->ld_start);
3583 p = xdr_encode_hyper(p, ld->ld_length);
3584 *p++ = cpu_to_be32(ld->ld_type);
3585 if (conf->len) {
3586 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3587 p = xdr_encode_opaque(p, conf->data, conf->len);
3588 kfree(conf->data);
3589 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3590 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3591 *p++ = cpu_to_be32(0); /* length of owner name */
3592 }
3593 return nfserr_denied;
3594}
3595
3596static __be32
3597nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3598{
3599 struct xdr_stream *xdr = &resp->xdr;
3600
3601 if (!nfserr)
3602 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3603 else if (nfserr == nfserr_denied)
3604 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3605
3606 return nfserr;
3607}
3608
3609static __be32
3610nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3611{
3612 struct xdr_stream *xdr = &resp->xdr;
3613
3614 if (nfserr == nfserr_denied)
3615 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3616 return nfserr;
3617}
3618
3619static __be32
3620nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3621{
3622 struct xdr_stream *xdr = &resp->xdr;
3623
3624 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3625}
3626
3627
3628static __be32
3629nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3630{
3631 struct xdr_stream *xdr = &resp->xdr;
3632 __be32 *p;
3633
3634 p = xdr_reserve_space(xdr, 20);
3635 if (!p)
3636 return nfserr_resource;
3637 p = encode_cinfo(p, &link->li_cinfo);
3638 return 0;
3639}
3640
3641
3642static __be32
3643nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3644{
3645 struct xdr_stream *xdr = &resp->xdr;
3646 __be32 *p;
3647
3648 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3649 if (nfserr)
3650 return nfserr;
3651 p = xdr_reserve_space(xdr, 24);
3652 if (!p)
3653 return nfserr_resource;
3654 p = encode_cinfo(p, &open->op_cinfo);
3655 *p++ = cpu_to_be32(open->op_rflags);
3656
3657 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3658 open->op_bmval[2]);
3659 if (nfserr)
3660 return nfserr;
3661
3662 p = xdr_reserve_space(xdr, 4);
3663 if (!p)
3664 return nfserr_resource;
3665
3666 *p++ = cpu_to_be32(open->op_delegate_type);
3667 switch (open->op_delegate_type) {
3668 case NFS4_OPEN_DELEGATE_NONE:
3669 break;
3670 case NFS4_OPEN_DELEGATE_READ:
3671 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3672 if (nfserr)
3673 return nfserr;
3674 p = xdr_reserve_space(xdr, 20);
3675 if (!p)
3676 return nfserr_resource;
3677 *p++ = cpu_to_be32(open->op_recall);
3678
3679 /*
3680 * TODO: ACE's in delegations
3681 */
3682 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3683 *p++ = cpu_to_be32(0);
3684 *p++ = cpu_to_be32(0);
3685 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3686 break;
3687 case NFS4_OPEN_DELEGATE_WRITE:
3688 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3689 if (nfserr)
3690 return nfserr;
3691 p = xdr_reserve_space(xdr, 32);
3692 if (!p)
3693 return nfserr_resource;
3694 *p++ = cpu_to_be32(0);
3695
3696 /*
3697 * TODO: space_limit's in delegations
3698 */
3699 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3700 *p++ = cpu_to_be32(~(u32)0);
3701 *p++ = cpu_to_be32(~(u32)0);
3702
3703 /*
3704 * TODO: ACE's in delegations
3705 */
3706 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3707 *p++ = cpu_to_be32(0);
3708 *p++ = cpu_to_be32(0);
3709 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3710 break;
3711 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3712 switch (open->op_why_no_deleg) {
3713 case WND4_CONTENTION:
3714 case WND4_RESOURCE:
3715 p = xdr_reserve_space(xdr, 8);
3716 if (!p)
3717 return nfserr_resource;
3718 *p++ = cpu_to_be32(open->op_why_no_deleg);
3719 /* deleg signaling not supported yet: */
3720 *p++ = cpu_to_be32(0);
3721 break;
3722 default:
3723 p = xdr_reserve_space(xdr, 4);
3724 if (!p)
3725 return nfserr_resource;
3726 *p++ = cpu_to_be32(open->op_why_no_deleg);
3727 }
3728 break;
3729 default:
3730 BUG();
3731 }
3732 /* XXX save filehandle here */
3733 return 0;
3734}
3735
3736static __be32
3737nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3738{
3739 struct xdr_stream *xdr = &resp->xdr;
3740
3741 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3742}
3743
3744static __be32
3745nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3746{
3747 struct xdr_stream *xdr = &resp->xdr;
3748
3749 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3750}
3751
3752static __be32 nfsd4_encode_splice_read(
3753 struct nfsd4_compoundres *resp,
3754 struct nfsd4_read *read,
3755 struct file *file, unsigned long maxcount)
3756{
3757 struct xdr_stream *xdr = &resp->xdr;
3758 struct xdr_buf *buf = xdr->buf;
3759 u32 eof;
3760 int space_left;
3761 __be32 nfserr;
3762 __be32 *p = xdr->p - 2;
3763
3764 /* Make sure there will be room for padding if needed */
3765 if (xdr->end - xdr->p < 1)
3766 return nfserr_resource;
3767
3768 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3769 file, read->rd_offset, &maxcount, &eof);
3770 read->rd_length = maxcount;
3771 if (nfserr) {
3772 /*
3773 * nfsd_splice_actor may have already messed with the
3774 * page length; reset it so as not to confuse
3775 * xdr_truncate_encode:
3776 */
3777 buf->page_len = 0;
3778 return nfserr;
3779 }
3780
3781 *(p++) = htonl(eof);
3782 *(p++) = htonl(maxcount);
3783
3784 buf->page_len = maxcount;
3785 buf->len += maxcount;
3786 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3787 / PAGE_SIZE;
3788
3789 /* Use rest of head for padding and remaining ops: */
3790 buf->tail[0].iov_base = xdr->p;
3791 buf->tail[0].iov_len = 0;
3792 xdr->iov = buf->tail;
3793 if (maxcount&3) {
3794 int pad = 4 - (maxcount&3);
3795
3796 *(xdr->p++) = 0;
3797
3798 buf->tail[0].iov_base += maxcount&3;
3799 buf->tail[0].iov_len = pad;
3800 buf->len += pad;
3801 }
3802
3803 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3804 buf->buflen - buf->len);
3805 buf->buflen = buf->len + space_left;
3806 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3807
3808 return 0;
3809}
3810
3811static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3812 struct nfsd4_read *read,
3813 struct file *file, unsigned long maxcount)
3814{
3815 struct xdr_stream *xdr = &resp->xdr;
3816 u32 eof;
3817 int v;
3818 int starting_len = xdr->buf->len - 8;
3819 long len;
3820 int thislen;
3821 __be32 nfserr;
3822 __be32 tmp;
3823 __be32 *p;
3824 int pad;
3825
3826 /*
3827 * svcrdma requires every READ payload to start somewhere
3828 * in xdr->pages.
3829 */
3830 if (xdr->iov == xdr->buf->head) {
3831 xdr->iov = NULL;
3832 xdr->end = xdr->p;
3833 }
3834
3835 len = maxcount;
3836 v = 0;
3837 while (len) {
3838 thislen = min_t(long, len, PAGE_SIZE);
3839 p = xdr_reserve_space(xdr, thislen);
3840 WARN_ON_ONCE(!p);
3841 resp->rqstp->rq_vec[v].iov_base = p;
3842 resp->rqstp->rq_vec[v].iov_len = thislen;
3843 v++;
3844 len -= thislen;
3845 }
3846 read->rd_vlen = v;
3847
3848 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3849 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
3850 &eof);
3851 read->rd_length = maxcount;
3852 if (nfserr)
3853 return nfserr;
3854 if (svc_encode_read_payload(resp->rqstp, starting_len + 8, maxcount))
3855 return nfserr_io;
3856 xdr_truncate_encode(xdr, starting_len + 8 + xdr_align_size(maxcount));
3857
3858 tmp = htonl(eof);
3859 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3860 tmp = htonl(maxcount);
3861 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3862
3863 tmp = xdr_zero;
3864 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3865 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3866 &tmp, pad);
3867 return 0;
3868
3869}
3870
3871static __be32
3872nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3873 struct nfsd4_read *read)
3874{
3875 unsigned long maxcount;
3876 struct xdr_stream *xdr = &resp->xdr;
3877 struct file *file;
3878 int starting_len = xdr->buf->len;
3879 __be32 *p;
3880
3881 if (nfserr)
3882 return nfserr;
3883 file = read->rd_nf->nf_file;
3884
3885 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3886 if (!p) {
3887 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3888 return nfserr_resource;
3889 }
3890 if (resp->xdr.buf->page_len &&
3891 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3892 WARN_ON_ONCE(1);
3893 return nfserr_resource;
3894 }
3895 xdr_commit_encode(xdr);
3896
3897 maxcount = svc_max_payload(resp->rqstp);
3898 maxcount = min_t(unsigned long, maxcount,
3899 (xdr->buf->buflen - xdr->buf->len));
3900 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3901
3902 if (file->f_op->splice_read &&
3903 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3904 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3905 else
3906 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3907
3908 if (nfserr)
3909 xdr_truncate_encode(xdr, starting_len);
3910
3911 return nfserr;
3912}
3913
3914static __be32
3915nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3916{
3917 int maxcount;
3918 __be32 wire_count;
3919 int zero = 0;
3920 struct xdr_stream *xdr = &resp->xdr;
3921 int length_offset = xdr->buf->len;
3922 __be32 *p;
3923
3924 p = xdr_reserve_space(xdr, 4);
3925 if (!p)
3926 return nfserr_resource;
3927 maxcount = PAGE_SIZE;
3928
3929 p = xdr_reserve_space(xdr, maxcount);
3930 if (!p)
3931 return nfserr_resource;
3932 /*
3933 * XXX: By default, vfs_readlink() will truncate symlinks if they
3934 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3935 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3936 * that truncation occurred, and return NFS4ERR_RESOURCE.
3937 */
3938 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3939 (char *)p, &maxcount);
3940 if (nfserr == nfserr_isdir)
3941 nfserr = nfserr_inval;
3942 if (nfserr) {
3943 xdr_truncate_encode(xdr, length_offset);
3944 return nfserr;
3945 }
3946
3947 wire_count = htonl(maxcount);
3948 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3949 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3950 if (maxcount & 3)
3951 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3952 &zero, 4 - (maxcount&3));
3953 return 0;
3954}
3955
3956static __be32
3957nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3958{
3959 int maxcount;
3960 int bytes_left;
3961 loff_t offset;
3962 __be64 wire_offset;
3963 struct xdr_stream *xdr = &resp->xdr;
3964 int starting_len = xdr->buf->len;
3965 __be32 *p;
3966
3967 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3968 if (!p)
3969 return nfserr_resource;
3970
3971 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3972 *p++ = cpu_to_be32(0);
3973 *p++ = cpu_to_be32(0);
3974 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3975 - (char *)resp->xdr.buf->head[0].iov_base;
3976
3977 /*
3978 * Number of bytes left for directory entries allowing for the
3979 * final 8 bytes of the readdir and a following failed op:
3980 */
3981 bytes_left = xdr->buf->buflen - xdr->buf->len
3982 - COMPOUND_ERR_SLACK_SPACE - 8;
3983 if (bytes_left < 0) {
3984 nfserr = nfserr_resource;
3985 goto err_no_verf;
3986 }
3987 maxcount = svc_max_payload(resp->rqstp);
3988 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3989 /*
3990 * Note the rfc defines rd_maxcount as the size of the
3991 * READDIR4resok structure, which includes the verifier above
3992 * and the 8 bytes encoded at the end of this function:
3993 */
3994 if (maxcount < 16) {
3995 nfserr = nfserr_toosmall;
3996 goto err_no_verf;
3997 }
3998 maxcount = min_t(int, maxcount-16, bytes_left);
3999
4000 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4001 if (!readdir->rd_dircount)
4002 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4003
4004 readdir->xdr = xdr;
4005 readdir->rd_maxcount = maxcount;
4006 readdir->common.err = 0;
4007 readdir->cookie_offset = 0;
4008
4009 offset = readdir->rd_cookie;
4010 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4011 &offset,
4012 &readdir->common, nfsd4_encode_dirent);
4013 if (nfserr == nfs_ok &&
4014 readdir->common.err == nfserr_toosmall &&
4015 xdr->buf->len == starting_len + 8) {
4016 /* nothing encoded; which limit did we hit?: */
4017 if (maxcount - 16 < bytes_left)
4018 /* It was the fault of rd_maxcount: */
4019 nfserr = nfserr_toosmall;
4020 else
4021 /* We ran out of buffer space: */
4022 nfserr = nfserr_resource;
4023 }
4024 if (nfserr)
4025 goto err_no_verf;
4026
4027 if (readdir->cookie_offset) {
4028 wire_offset = cpu_to_be64(offset);
4029 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4030 &wire_offset, 8);
4031 }
4032
4033 p = xdr_reserve_space(xdr, 8);
4034 if (!p) {
4035 WARN_ON_ONCE(1);
4036 goto err_no_verf;
4037 }
4038 *p++ = 0; /* no more entries */
4039 *p++ = htonl(readdir->common.err == nfserr_eof);
4040
4041 return 0;
4042err_no_verf:
4043 xdr_truncate_encode(xdr, starting_len);
4044 return nfserr;
4045}
4046
4047static __be32
4048nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
4049{
4050 struct xdr_stream *xdr = &resp->xdr;
4051 __be32 *p;
4052
4053 p = xdr_reserve_space(xdr, 20);
4054 if (!p)
4055 return nfserr_resource;
4056 p = encode_cinfo(p, &remove->rm_cinfo);
4057 return 0;
4058}
4059
4060static __be32
4061nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
4062{
4063 struct xdr_stream *xdr = &resp->xdr;
4064 __be32 *p;
4065
4066 p = xdr_reserve_space(xdr, 40);
4067 if (!p)
4068 return nfserr_resource;
4069 p = encode_cinfo(p, &rename->rn_sinfo);
4070 p = encode_cinfo(p, &rename->rn_tinfo);
4071 return 0;
4072}
4073
4074static __be32
4075nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4076{
4077 u32 i, nflavs, supported;
4078 struct exp_flavor_info *flavs;
4079 struct exp_flavor_info def_flavs[2];
4080 __be32 *p, *flavorsp;
4081 static bool report = true;
4082
4083 if (exp->ex_nflavors) {
4084 flavs = exp->ex_flavors;
4085 nflavs = exp->ex_nflavors;
4086 } else { /* Handling of some defaults in absence of real secinfo: */
4087 flavs = def_flavs;
4088 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4089 nflavs = 2;
4090 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4091 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4092 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4093 nflavs = 1;
4094 flavs[0].pseudoflavor
4095 = svcauth_gss_flavor(exp->ex_client);
4096 } else {
4097 nflavs = 1;
4098 flavs[0].pseudoflavor
4099 = exp->ex_client->flavour->flavour;
4100 }
4101 }
4102
4103 supported = 0;
4104 p = xdr_reserve_space(xdr, 4);
4105 if (!p)
4106 return nfserr_resource;
4107 flavorsp = p++; /* to be backfilled later */
4108
4109 for (i = 0; i < nflavs; i++) {
4110 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4111 struct rpcsec_gss_info info;
4112
4113 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4114 supported++;
4115 p = xdr_reserve_space(xdr, 4 + 4 +
4116 XDR_LEN(info.oid.len) + 4 + 4);
4117 if (!p)
4118 return nfserr_resource;
4119 *p++ = cpu_to_be32(RPC_AUTH_GSS);
4120 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
4121 *p++ = cpu_to_be32(info.qop);
4122 *p++ = cpu_to_be32(info.service);
4123 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4124 supported++;
4125 p = xdr_reserve_space(xdr, 4);
4126 if (!p)
4127 return nfserr_resource;
4128 *p++ = cpu_to_be32(pf);
4129 } else {
4130 if (report)
4131 pr_warn("NFS: SECINFO: security flavor %u "
4132 "is not supported\n", pf);
4133 }
4134 }
4135
4136 if (nflavs != supported)
4137 report = false;
4138 *flavorsp = htonl(supported);
4139 return 0;
4140}
4141
4142static __be32
4143nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4144 struct nfsd4_secinfo *secinfo)
4145{
4146 struct xdr_stream *xdr = &resp->xdr;
4147
4148 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4149}
4150
4151static __be32
4152nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4153 struct nfsd4_secinfo_no_name *secinfo)
4154{
4155 struct xdr_stream *xdr = &resp->xdr;
4156
4157 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4158}
4159
4160/*
4161 * The SETATTR encode routine is special -- it always encodes a bitmap,
4162 * regardless of the error status.
4163 */
4164static __be32
4165nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
4166{
4167 struct xdr_stream *xdr = &resp->xdr;
4168 __be32 *p;
4169
4170 p = xdr_reserve_space(xdr, 16);
4171 if (!p)
4172 return nfserr_resource;
4173 if (nfserr) {
4174 *p++ = cpu_to_be32(3);
4175 *p++ = cpu_to_be32(0);
4176 *p++ = cpu_to_be32(0);
4177 *p++ = cpu_to_be32(0);
4178 }
4179 else {
4180 *p++ = cpu_to_be32(3);
4181 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4182 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4183 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4184 }
4185 return nfserr;
4186}
4187
4188static __be32
4189nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
4190{
4191 struct xdr_stream *xdr = &resp->xdr;
4192 __be32 *p;
4193
4194 if (!nfserr) {
4195 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4196 if (!p)
4197 return nfserr_resource;
4198 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4199 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4200 NFS4_VERIFIER_SIZE);
4201 }
4202 else if (nfserr == nfserr_clid_inuse) {
4203 p = xdr_reserve_space(xdr, 8);
4204 if (!p)
4205 return nfserr_resource;
4206 *p++ = cpu_to_be32(0);
4207 *p++ = cpu_to_be32(0);
4208 }
4209 return nfserr;
4210}
4211
4212static __be32
4213nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
4214{
4215 struct xdr_stream *xdr = &resp->xdr;
4216 __be32 *p;
4217
4218 p = xdr_reserve_space(xdr, 16);
4219 if (!p)
4220 return nfserr_resource;
4221 *p++ = cpu_to_be32(write->wr_bytes_written);
4222 *p++ = cpu_to_be32(write->wr_how_written);
4223 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4224 NFS4_VERIFIER_SIZE);
4225 return 0;
4226}
4227
4228static __be32
4229nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4230 struct nfsd4_exchange_id *exid)
4231{
4232 struct xdr_stream *xdr = &resp->xdr;
4233 __be32 *p;
4234 char *major_id;
4235 char *server_scope;
4236 int major_id_sz;
4237 int server_scope_sz;
4238 uint64_t minor_id = 0;
4239 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4240
4241 major_id = nn->nfsd_name;
4242 major_id_sz = strlen(nn->nfsd_name);
4243 server_scope = nn->nfsd_name;
4244 server_scope_sz = strlen(nn->nfsd_name);
4245
4246 p = xdr_reserve_space(xdr,
4247 8 /* eir_clientid */ +
4248 4 /* eir_sequenceid */ +
4249 4 /* eir_flags */ +
4250 4 /* spr_how */);
4251 if (!p)
4252 return nfserr_resource;
4253
4254 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4255 *p++ = cpu_to_be32(exid->seqid);
4256 *p++ = cpu_to_be32(exid->flags);
4257
4258 *p++ = cpu_to_be32(exid->spa_how);
4259
4260 switch (exid->spa_how) {
4261 case SP4_NONE:
4262 break;
4263 case SP4_MACH_CRED:
4264 /* spo_must_enforce bitmap: */
4265 nfserr = nfsd4_encode_bitmap(xdr,
4266 exid->spo_must_enforce[0],
4267 exid->spo_must_enforce[1],
4268 exid->spo_must_enforce[2]);
4269 if (nfserr)
4270 return nfserr;
4271 /* spo_must_allow bitmap: */
4272 nfserr = nfsd4_encode_bitmap(xdr,
4273 exid->spo_must_allow[0],
4274 exid->spo_must_allow[1],
4275 exid->spo_must_allow[2]);
4276 if (nfserr)
4277 return nfserr;
4278 break;
4279 default:
4280 WARN_ON_ONCE(1);
4281 }
4282
4283 p = xdr_reserve_space(xdr,
4284 8 /* so_minor_id */ +
4285 4 /* so_major_id.len */ +
4286 (XDR_QUADLEN(major_id_sz) * 4) +
4287 4 /* eir_server_scope.len */ +
4288 (XDR_QUADLEN(server_scope_sz) * 4) +
4289 4 /* eir_server_impl_id.count (0) */);
4290 if (!p)
4291 return nfserr_resource;
4292
4293 /* The server_owner struct */
4294 p = xdr_encode_hyper(p, minor_id); /* Minor id */
4295 /* major id */
4296 p = xdr_encode_opaque(p, major_id, major_id_sz);
4297
4298 /* Server scope */
4299 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4300
4301 /* Implementation id */
4302 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4303 return 0;
4304}
4305
4306static __be32
4307nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4308 struct nfsd4_create_session *sess)
4309{
4310 struct xdr_stream *xdr = &resp->xdr;
4311 __be32 *p;
4312
4313 p = xdr_reserve_space(xdr, 24);
4314 if (!p)
4315 return nfserr_resource;
4316 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4317 NFS4_MAX_SESSIONID_LEN);
4318 *p++ = cpu_to_be32(sess->seqid);
4319 *p++ = cpu_to_be32(sess->flags);
4320
4321 p = xdr_reserve_space(xdr, 28);
4322 if (!p)
4323 return nfserr_resource;
4324 *p++ = cpu_to_be32(0); /* headerpadsz */
4325 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4326 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4327 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4328 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4329 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4330 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4331
4332 if (sess->fore_channel.nr_rdma_attrs) {
4333 p = xdr_reserve_space(xdr, 4);
4334 if (!p)
4335 return nfserr_resource;
4336 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4337 }
4338
4339 p = xdr_reserve_space(xdr, 28);
4340 if (!p)
4341 return nfserr_resource;
4342 *p++ = cpu_to_be32(0); /* headerpadsz */
4343 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4344 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4345 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4346 *p++ = cpu_to_be32(sess->back_channel.maxops);
4347 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4348 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4349
4350 if (sess->back_channel.nr_rdma_attrs) {
4351 p = xdr_reserve_space(xdr, 4);
4352 if (!p)
4353 return nfserr_resource;
4354 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4355 }
4356 return 0;
4357}
4358
4359static __be32
4360nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4361 struct nfsd4_sequence *seq)
4362{
4363 struct xdr_stream *xdr = &resp->xdr;
4364 __be32 *p;
4365
4366 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4367 if (!p)
4368 return nfserr_resource;
4369 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4370 NFS4_MAX_SESSIONID_LEN);
4371 *p++ = cpu_to_be32(seq->seqid);
4372 *p++ = cpu_to_be32(seq->slotid);
4373 /* Note slotid's are numbered from zero: */
4374 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4375 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4376 *p++ = cpu_to_be32(seq->status_flags);
4377
4378 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4379 return 0;
4380}
4381
4382static __be32
4383nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4384 struct nfsd4_test_stateid *test_stateid)
4385{
4386 struct xdr_stream *xdr = &resp->xdr;
4387 struct nfsd4_test_stateid_id *stateid, *next;
4388 __be32 *p;
4389
4390 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4391 if (!p)
4392 return nfserr_resource;
4393 *p++ = htonl(test_stateid->ts_num_ids);
4394
4395 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4396 *p++ = stateid->ts_id_status;
4397 }
4398
4399 return 0;
4400}
4401
4402#ifdef CONFIG_NFSD_PNFS
4403static __be32
4404nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4405 struct nfsd4_getdeviceinfo *gdev)
4406{
4407 struct xdr_stream *xdr = &resp->xdr;
4408 const struct nfsd4_layout_ops *ops;
4409 u32 starting_len = xdr->buf->len, needed_len;
4410 __be32 *p;
4411
4412 p = xdr_reserve_space(xdr, 4);
4413 if (!p)
4414 return nfserr_resource;
4415
4416 *p++ = cpu_to_be32(gdev->gd_layout_type);
4417
4418 /* If maxcount is 0 then just update notifications */
4419 if (gdev->gd_maxcount != 0) {
4420 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4421 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4422 if (nfserr) {
4423 /*
4424 * We don't bother to burden the layout drivers with
4425 * enforcing gd_maxcount, just tell the client to
4426 * come back with a bigger buffer if it's not enough.
4427 */
4428 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4429 goto toosmall;
4430 return nfserr;
4431 }
4432 }
4433
4434 if (gdev->gd_notify_types) {
4435 p = xdr_reserve_space(xdr, 4 + 4);
4436 if (!p)
4437 return nfserr_resource;
4438 *p++ = cpu_to_be32(1); /* bitmap length */
4439 *p++ = cpu_to_be32(gdev->gd_notify_types);
4440 } else {
4441 p = xdr_reserve_space(xdr, 4);
4442 if (!p)
4443 return nfserr_resource;
4444 *p++ = 0;
4445 }
4446
4447 return 0;
4448toosmall:
4449 dprintk("%s: maxcount too small\n", __func__);
4450 needed_len = xdr->buf->len + 4 /* notifications */;
4451 xdr_truncate_encode(xdr, starting_len);
4452 p = xdr_reserve_space(xdr, 4);
4453 if (!p)
4454 return nfserr_resource;
4455 *p++ = cpu_to_be32(needed_len);
4456 return nfserr_toosmall;
4457}
4458
4459static __be32
4460nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4461 struct nfsd4_layoutget *lgp)
4462{
4463 struct xdr_stream *xdr = &resp->xdr;
4464 const struct nfsd4_layout_ops *ops;
4465 __be32 *p;
4466
4467 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4468 if (!p)
4469 return nfserr_resource;
4470
4471 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4472 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4473 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4474 sizeof(stateid_opaque_t));
4475
4476 *p++ = cpu_to_be32(1); /* we always return a single layout */
4477 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4478 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4479 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4480 *p++ = cpu_to_be32(lgp->lg_layout_type);
4481
4482 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4483 return ops->encode_layoutget(xdr, lgp);
4484}
4485
4486static __be32
4487nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4488 struct nfsd4_layoutcommit *lcp)
4489{
4490 struct xdr_stream *xdr = &resp->xdr;
4491 __be32 *p;
4492
4493 p = xdr_reserve_space(xdr, 4);
4494 if (!p)
4495 return nfserr_resource;
4496 *p++ = cpu_to_be32(lcp->lc_size_chg);
4497 if (lcp->lc_size_chg) {
4498 p = xdr_reserve_space(xdr, 8);
4499 if (!p)
4500 return nfserr_resource;
4501 p = xdr_encode_hyper(p, lcp->lc_newsize);
4502 }
4503
4504 return 0;
4505}
4506
4507static __be32
4508nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4509 struct nfsd4_layoutreturn *lrp)
4510{
4511 struct xdr_stream *xdr = &resp->xdr;
4512 __be32 *p;
4513
4514 p = xdr_reserve_space(xdr, 4);
4515 if (!p)
4516 return nfserr_resource;
4517 *p++ = cpu_to_be32(lrp->lrs_present);
4518 if (lrp->lrs_present)
4519 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4520 return 0;
4521}
4522#endif /* CONFIG_NFSD_PNFS */
4523
4524static __be32
4525nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4526 struct nfsd42_write_res *write, bool sync)
4527{
4528 __be32 *p;
4529 p = xdr_reserve_space(&resp->xdr, 4);
4530 if (!p)
4531 return nfserr_resource;
4532
4533 if (sync)
4534 *p++ = cpu_to_be32(0);
4535 else {
4536 __be32 nfserr;
4537 *p++ = cpu_to_be32(1);
4538 nfserr = nfsd4_encode_stateid(&resp->xdr, &write->cb_stateid);
4539 if (nfserr)
4540 return nfserr;
4541 }
4542 p = xdr_reserve_space(&resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4543 if (!p)
4544 return nfserr_resource;
4545
4546 p = xdr_encode_hyper(p, write->wr_bytes_written);
4547 *p++ = cpu_to_be32(write->wr_stable_how);
4548 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4549 NFS4_VERIFIER_SIZE);
4550 return nfs_ok;
4551}
4552
4553static __be32
4554nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4555{
4556 struct xdr_stream *xdr = &resp->xdr;
4557 struct nfs42_netaddr *addr;
4558 __be32 *p;
4559
4560 p = xdr_reserve_space(xdr, 4);
4561 *p++ = cpu_to_be32(ns->nl4_type);
4562
4563 switch (ns->nl4_type) {
4564 case NL4_NETADDR:
4565 addr = &ns->u.nl4_addr;
4566
4567 /* netid_len, netid, uaddr_len, uaddr (port included
4568 * in RPCBIND_MAXUADDRLEN)
4569 */
4570 p = xdr_reserve_space(xdr,
4571 4 /* netid len */ +
4572 (XDR_QUADLEN(addr->netid_len) * 4) +
4573 4 /* uaddr len */ +
4574 (XDR_QUADLEN(addr->addr_len) * 4));
4575 if (!p)
4576 return nfserr_resource;
4577
4578 *p++ = cpu_to_be32(addr->netid_len);
4579 p = xdr_encode_opaque_fixed(p, addr->netid,
4580 addr->netid_len);
4581 *p++ = cpu_to_be32(addr->addr_len);
4582 p = xdr_encode_opaque_fixed(p, addr->addr,
4583 addr->addr_len);
4584 break;
4585 default:
4586 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4587 return nfserr_inval;
4588 }
4589
4590 return 0;
4591}
4592
4593static __be32
4594nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4595 struct nfsd4_copy *copy)
4596{
4597 __be32 *p;
4598
4599 nfserr = nfsd42_encode_write_res(resp, ©->cp_res,
4600 copy->cp_synchronous);
4601 if (nfserr)
4602 return nfserr;
4603
4604 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4605 *p++ = xdr_one; /* cr_consecutive */
4606 *p++ = cpu_to_be32(copy->cp_synchronous);
4607 return 0;
4608}
4609
4610static __be32
4611nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4612 struct nfsd4_offload_status *os)
4613{
4614 struct xdr_stream *xdr = &resp->xdr;
4615 __be32 *p;
4616
4617 p = xdr_reserve_space(xdr, 8 + 4);
4618 if (!p)
4619 return nfserr_resource;
4620 p = xdr_encode_hyper(p, os->count);
4621 *p++ = cpu_to_be32(0);
4622
4623 return nfserr;
4624}
4625
4626static __be32
4627nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4628 struct nfsd4_copy_notify *cn)
4629{
4630 struct xdr_stream *xdr = &resp->xdr;
4631 __be32 *p;
4632
4633 if (nfserr)
4634 return nfserr;
4635
4636 /* 8 sec, 4 nsec */
4637 p = xdr_reserve_space(xdr, 12);
4638 if (!p)
4639 return nfserr_resource;
4640
4641 /* cnr_lease_time */
4642 p = xdr_encode_hyper(p, cn->cpn_sec);
4643 *p++ = cpu_to_be32(cn->cpn_nsec);
4644
4645 /* cnr_stateid */
4646 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4647 if (nfserr)
4648 return nfserr;
4649
4650 /* cnr_src.nl_nsvr */
4651 p = xdr_reserve_space(xdr, 4);
4652 if (!p)
4653 return nfserr_resource;
4654
4655 *p++ = cpu_to_be32(1);
4656
4657 return nfsd42_encode_nl4_server(resp, &cn->cpn_src);
4658}
4659
4660static __be32
4661nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4662 struct nfsd4_seek *seek)
4663{
4664 __be32 *p;
4665
4666 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4667 *p++ = cpu_to_be32(seek->seek_eof);
4668 p = xdr_encode_hyper(p, seek->seek_pos);
4669
4670 return 0;
4671}
4672
4673static __be32
4674nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4675{
4676 return nfserr;
4677}
4678
4679/*
4680 * Encode kmalloc-ed buffer in to XDR stream.
4681 */
4682static int
4683nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
4684{
4685 u32 cplen;
4686 __be32 *p;
4687
4688 cplen = min_t(unsigned long, buflen,
4689 ((void *)xdr->end - (void *)xdr->p));
4690 p = xdr_reserve_space(xdr, cplen);
4691 if (!p)
4692 return nfserr_resource;
4693
4694 memcpy(p, buf, cplen);
4695 buf += cplen;
4696 buflen -= cplen;
4697
4698 while (buflen) {
4699 cplen = min_t(u32, buflen, PAGE_SIZE);
4700 p = xdr_reserve_space(xdr, cplen);
4701 if (!p)
4702 return nfserr_resource;
4703
4704 memcpy(p, buf, cplen);
4705
4706 if (cplen < PAGE_SIZE) {
4707 /*
4708 * We're done, with a length that wasn't page
4709 * aligned, so possibly not word aligned. Pad
4710 * any trailing bytes with 0.
4711 */
4712 xdr_encode_opaque_fixed(p, NULL, cplen);
4713 break;
4714 }
4715
4716 buflen -= PAGE_SIZE;
4717 buf += PAGE_SIZE;
4718 }
4719
4720 return 0;
4721}
4722
4723static __be32
4724nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4725 struct nfsd4_getxattr *getxattr)
4726{
4727 struct xdr_stream *xdr = &resp->xdr;
4728 __be32 *p, err;
4729
4730 p = xdr_reserve_space(xdr, 4);
4731 if (!p)
4732 return nfserr_resource;
4733
4734 *p = cpu_to_be32(getxattr->getxa_len);
4735
4736 if (getxattr->getxa_len == 0)
4737 return 0;
4738
4739 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
4740 getxattr->getxa_len);
4741
4742 kvfree(getxattr->getxa_buf);
4743
4744 return err;
4745}
4746
4747static __be32
4748nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4749 struct nfsd4_setxattr *setxattr)
4750{
4751 struct xdr_stream *xdr = &resp->xdr;
4752 __be32 *p;
4753
4754 p = xdr_reserve_space(xdr, 20);
4755 if (!p)
4756 return nfserr_resource;
4757
4758 encode_cinfo(p, &setxattr->setxa_cinfo);
4759
4760 return 0;
4761}
4762
4763/*
4764 * See if there are cookie values that can be rejected outright.
4765 */
4766static __be32
4767nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
4768 u32 *offsetp)
4769{
4770 u64 cookie = listxattrs->lsxa_cookie;
4771
4772 /*
4773 * If the cookie is larger than the maximum number we can fit
4774 * in either the buffer we just got back from vfs_listxattr, or,
4775 * XDR-encoded, in the return buffer, it's invalid.
4776 */
4777 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
4778 return nfserr_badcookie;
4779
4780 if (cookie > (listxattrs->lsxa_maxcount /
4781 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
4782 return nfserr_badcookie;
4783
4784 *offsetp = (u32)cookie;
4785 return 0;
4786}
4787
4788static __be32
4789nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
4790 struct nfsd4_listxattrs *listxattrs)
4791{
4792 struct xdr_stream *xdr = &resp->xdr;
4793 u32 cookie_offset, count_offset, eof;
4794 u32 left, xdrleft, slen, count;
4795 u32 xdrlen, offset;
4796 u64 cookie;
4797 char *sp;
4798 __be32 status;
4799 __be32 *p;
4800 u32 nuser;
4801
4802 eof = 1;
4803
4804 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
4805 if (status)
4806 goto out;
4807
4808 /*
4809 * Reserve space for the cookie and the name array count. Record
4810 * the offsets to save them later.
4811 */
4812 cookie_offset = xdr->buf->len;
4813 count_offset = cookie_offset + 8;
4814 p = xdr_reserve_space(xdr, 12);
4815 if (!p) {
4816 status = nfserr_resource;
4817 goto out;
4818 }
4819
4820 count = 0;
4821 left = listxattrs->lsxa_len;
4822 sp = listxattrs->lsxa_buf;
4823 nuser = 0;
4824
4825 xdrleft = listxattrs->lsxa_maxcount;
4826
4827 while (left > 0 && xdrleft > 0) {
4828 slen = strlen(sp);
4829
4830 /*
4831 * Check if this a user. attribute, skip it if not.
4832 */
4833 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
4834 goto contloop;
4835
4836 slen -= XATTR_USER_PREFIX_LEN;
4837 xdrlen = 4 + ((slen + 3) & ~3);
4838 if (xdrlen > xdrleft) {
4839 if (count == 0) {
4840 /*
4841 * Can't even fit the first attribute name.
4842 */
4843 status = nfserr_toosmall;
4844 goto out;
4845 }
4846 eof = 0;
4847 goto wreof;
4848 }
4849
4850 left -= XATTR_USER_PREFIX_LEN;
4851 sp += XATTR_USER_PREFIX_LEN;
4852 if (nuser++ < offset)
4853 goto contloop;
4854
4855
4856 p = xdr_reserve_space(xdr, xdrlen);
4857 if (!p) {
4858 status = nfserr_resource;
4859 goto out;
4860 }
4861
4862 p = xdr_encode_opaque(p, sp, slen);
4863
4864 xdrleft -= xdrlen;
4865 count++;
4866contloop:
4867 sp += slen + 1;
4868 left -= slen + 1;
4869 }
4870
4871 /*
4872 * If there were user attributes to copy, but we didn't copy
4873 * any, the offset was too large (e.g. the cookie was invalid).
4874 */
4875 if (nuser > 0 && count == 0) {
4876 status = nfserr_badcookie;
4877 goto out;
4878 }
4879
4880wreof:
4881 p = xdr_reserve_space(xdr, 4);
4882 if (!p) {
4883 status = nfserr_resource;
4884 goto out;
4885 }
4886 *p = cpu_to_be32(eof);
4887
4888 cookie = offset + count;
4889
4890 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
4891 count = htonl(count);
4892 write_bytes_to_xdr_buf(xdr->buf, count_offset, &count, 4);
4893out:
4894 if (listxattrs->lsxa_len)
4895 kvfree(listxattrs->lsxa_buf);
4896 return status;
4897}
4898
4899static __be32
4900nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4901 struct nfsd4_removexattr *removexattr)
4902{
4903 struct xdr_stream *xdr = &resp->xdr;
4904 __be32 *p;
4905
4906 p = xdr_reserve_space(xdr, 20);
4907 if (!p)
4908 return nfserr_resource;
4909
4910 p = encode_cinfo(p, &removexattr->rmxa_cinfo);
4911 return 0;
4912}
4913
4914typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4915
4916/*
4917 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4918 * since we don't need to filter out obsolete ops as this is
4919 * done in the decoding phase.
4920 */
4921static const nfsd4_enc nfsd4_enc_ops[] = {
4922 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4923 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4924 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4925 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4926 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4927 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4928 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4929 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4930 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4931 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4932 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4933 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4934 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4935 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4936 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4937 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4938 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4939 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4940 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4941 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4942 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4943 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4944 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4945 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4946 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4947 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4948 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4949 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4950 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4951 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4952 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4953 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4954 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4955 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4956 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4957 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4958 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4959
4960 /* NFSv4.1 operations */
4961 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4962 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4963 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4964 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4965 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4966 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4967 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4968#ifdef CONFIG_NFSD_PNFS
4969 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4970 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4971 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4972 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4973 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4974#else
4975 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4976 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4977 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4978 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4979 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4980#endif
4981 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4982 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4983 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4984 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4985 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4986 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4987 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4988
4989 /* NFSv4.2 operations */
4990 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4991 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4992 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_copy_notify,
4993 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4994 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4995 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4996 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4997 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4998 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_offload_status,
4999 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
5000 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
5001 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
5002 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
5003
5004 /* RFC 8276 extended atributes operations */
5005 [OP_GETXATTR] = (nfsd4_enc)nfsd4_encode_getxattr,
5006 [OP_SETXATTR] = (nfsd4_enc)nfsd4_encode_setxattr,
5007 [OP_LISTXATTRS] = (nfsd4_enc)nfsd4_encode_listxattrs,
5008 [OP_REMOVEXATTR] = (nfsd4_enc)nfsd4_encode_removexattr,
5009};
5010
5011/*
5012 * Calculate whether we still have space to encode repsize bytes.
5013 * There are two considerations:
5014 * - For NFS versions >=4.1, the size of the reply must stay within
5015 * session limits
5016 * - For all NFS versions, we must stay within limited preallocated
5017 * buffer space.
5018 *
5019 * This is called before the operation is processed, so can only provide
5020 * an upper estimate. For some nonidempotent operations (such as
5021 * getattr), it's not necessarily a problem if that estimate is wrong,
5022 * as we can fail it after processing without significant side effects.
5023 */
5024__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5025{
5026 struct xdr_buf *buf = &resp->rqstp->rq_res;
5027 struct nfsd4_slot *slot = resp->cstate.slot;
5028
5029 if (buf->len + respsize <= buf->buflen)
5030 return nfs_ok;
5031 if (!nfsd4_has_session(&resp->cstate))
5032 return nfserr_resource;
5033 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5034 WARN_ON_ONCE(1);
5035 return nfserr_rep_too_big_to_cache;
5036 }
5037 return nfserr_rep_too_big;
5038}
5039
5040void
5041nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5042{
5043 struct xdr_stream *xdr = &resp->xdr;
5044 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5045 struct svc_rqst *rqstp = resp->rqstp;
5046 const struct nfsd4_operation *opdesc = op->opdesc;
5047 int post_err_offset;
5048 nfsd4_enc encoder;
5049 __be32 *p;
5050
5051 p = xdr_reserve_space(xdr, 8);
5052 if (!p) {
5053 WARN_ON_ONCE(1);
5054 return;
5055 }
5056 *p++ = cpu_to_be32(op->opnum);
5057 post_err_offset = xdr->buf->len;
5058
5059 if (op->opnum == OP_ILLEGAL)
5060 goto status;
5061 if (op->status && opdesc &&
5062 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5063 goto status;
5064 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5065 !nfsd4_enc_ops[op->opnum]);
5066 encoder = nfsd4_enc_ops[op->opnum];
5067 op->status = encoder(resp, op->status, &op->u);
5068 if (opdesc && opdesc->op_release)
5069 opdesc->op_release(&op->u);
5070 xdr_commit_encode(xdr);
5071
5072 /* nfsd4_check_resp_size guarantees enough room for error status */
5073 if (!op->status) {
5074 int space_needed = 0;
5075 if (!nfsd4_last_compound_op(rqstp))
5076 space_needed = COMPOUND_ERR_SLACK_SPACE;
5077 op->status = nfsd4_check_resp_size(resp, space_needed);
5078 }
5079 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5080 struct nfsd4_slot *slot = resp->cstate.slot;
5081
5082 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5083 op->status = nfserr_rep_too_big_to_cache;
5084 else
5085 op->status = nfserr_rep_too_big;
5086 }
5087 if (op->status == nfserr_resource ||
5088 op->status == nfserr_rep_too_big ||
5089 op->status == nfserr_rep_too_big_to_cache) {
5090 /*
5091 * The operation may have already been encoded or
5092 * partially encoded. No op returns anything additional
5093 * in the case of one of these three errors, so we can
5094 * just truncate back to after the status. But it's a
5095 * bug if we had to do this on a non-idempotent op:
5096 */
5097 warn_on_nonidempotent_op(op);
5098 xdr_truncate_encode(xdr, post_err_offset);
5099 }
5100 if (so) {
5101 int len = xdr->buf->len - post_err_offset;
5102
5103 so->so_replay.rp_status = op->status;
5104 so->so_replay.rp_buflen = len;
5105 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5106 so->so_replay.rp_buf, len);
5107 }
5108status:
5109 /* Note that op->status is already in network byte order: */
5110 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
5111}
5112
5113/*
5114 * Encode the reply stored in the stateowner reply cache
5115 *
5116 * XDR note: do not encode rp->rp_buflen: the buffer contains the
5117 * previously sent already encoded operation.
5118 */
5119void
5120nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5121{
5122 __be32 *p;
5123 struct nfs4_replay *rp = op->replay;
5124
5125 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5126 if (!p) {
5127 WARN_ON_ONCE(1);
5128 return;
5129 }
5130 *p++ = cpu_to_be32(op->opnum);
5131 *p++ = rp->rp_status; /* already xdr'ed */
5132
5133 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5134}
5135
5136int
5137nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
5138{
5139 return xdr_ressize_check(rqstp, p);
5140}
5141
5142void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5143{
5144 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5145
5146 if (args->ops != args->iops) {
5147 kfree(args->ops);
5148 args->ops = args->iops;
5149 }
5150 kfree(args->tmpp);
5151 args->tmpp = NULL;
5152 while (args->to_free) {
5153 struct svcxdr_tmpbuf *tb = args->to_free;
5154 args->to_free = tb->next;
5155 kfree(tb);
5156 }
5157}
5158
5159int
5160nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
5161{
5162 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5163
5164 if (rqstp->rq_arg.head[0].iov_len % 4) {
5165 /* client is nuts */
5166 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
5167 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
5168 return 0;
5169 }
5170 args->p = p;
5171 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
5172 args->pagelist = rqstp->rq_arg.pages;
5173 args->pagelen = rqstp->rq_arg.page_len;
5174 args->tail = false;
5175 args->tmpp = NULL;
5176 args->to_free = NULL;
5177 args->ops = args->iops;
5178 args->rqstp = rqstp;
5179
5180 return !nfsd4_decode_compound(args);
5181}
5182
5183int
5184nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
5185{
5186 /*
5187 * All that remains is to write the tag and operation count...
5188 */
5189 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5190 struct xdr_buf *buf = resp->xdr.buf;
5191
5192 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
5193 buf->tail[0].iov_len);
5194
5195 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
5196
5197 p = resp->tagp;
5198 *p++ = htonl(resp->taglen);
5199 memcpy(p, resp->tag, resp->taglen);
5200 p += XDR_QUADLEN(resp->taglen);
5201 *p++ = htonl(resp->opcnt);
5202
5203 nfsd4_sequence_done(resp);
5204 return 1;
5205}
5206
5207/*
5208 * Local variables:
5209 * c-basic-offset: 8
5210 * End:
5211 */