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HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blobee0da259a3d3b44b0a84190640561235fe61cad6
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
68 static __be32
69 check_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; \
88 out: \
89 return status; \
90 xdr_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
127 static 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 + XDR_QUADLEN(argp->pagelen);
133 argp->pagelen = 0;
134 } else {
135 argp->end = argp->p + (PAGE_SIZE>>2);
136 argp->pagelen -= PAGE_SIZE;
137 }
138 }
139
140 static __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
173 static 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 */
186 static void *
187 svcxdr_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 */
206 static char *
207 svcxdr_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 */
228 static 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 */
243 static __be32
244 nfsd4_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
259 static __be32
260 nfsd4_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
285 static __be32
286 nfsd4_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
449 static __be32
450 nfsd4_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
461 static __be32
462 nfsd4_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
472 static __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
552 static __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
563 static __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
575 static __be32
576 nfsd4_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
588 static __be32
589 nfsd4_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
600 static __be32
601 nfsd4_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
644 static inline __be32
645 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
646 {
647 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
648 }
649
650 static inline __be32
651 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
652 {
653 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
654 }
655
656 static __be32
657 nfsd4_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
671 static __be32
672 nfsd4_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
711 static __be32
712 nfsd4_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
730 static __be32
731 nfsd4_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
750 static __be32
751 nfsd4_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
765 static __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 }
814 xdr_error:
815 return nfserr_bad_xdr;
816 }
817
818 static __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;
828 xdr_error:
829 return nfserr_bad_xdr;
830 }
831
832 static __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;
845 xdr_error:
846 return nfserr_bad_xdr;
847 }
848
849 static __be32
850 nfsd4_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
962 static __be32
963 nfsd4_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
979 static __be32
980 nfsd4_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
999 static __be32
1000 nfsd4_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
1014 static __be32
1015 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1016 {
1017 if (argp->minorversion == 0)
1018 return nfs_ok;
1019 return nfserr_notsupp;
1020 }
1021
1022 static __be32
1023 nfsd4_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
1037 static __be32
1038 nfsd4_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
1053 static __be32
1054 nfsd4_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
1068 static __be32
1069 nfsd4_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
1089 static __be32
1090 nfsd4_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
1103 static __be32
1104 nfsd4_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
1119 static __be32
1120 nfsd4_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
1130 static __be32
1131 nfsd4_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
1142 static __be32
1143 nfsd4_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
1172 static __be32
1173 nfsd4_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 */
1188 static __be32
1189 nfsd4_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
1207 static __be32
1208 nfsd4_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 next_decode_page(argp);
1250 }
1251 argp->p += XDR_QUADLEN(len);
1252
1253 DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1258 {
1259 DECODE_HEAD;
1260
1261 if (argp->minorversion >= 1)
1262 return nfserr_notsupp;
1263
1264 READ_BUF(12);
1265 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1266 rlockowner->rl_owner.len = be32_to_cpup(p++);
1267 READ_BUF(rlockowner->rl_owner.len);
1268 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1269
1270 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1271 return nfserr_inval;
1272 DECODE_TAIL;
1273 }
1274
1275 static __be32
1276 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1277 struct nfsd4_exchange_id *exid)
1278 {
1279 int dummy, tmp;
1280 DECODE_HEAD;
1281
1282 READ_BUF(NFS4_VERIFIER_SIZE);
1283 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1284
1285 status = nfsd4_decode_opaque(argp, &exid->clname);
1286 if (status)
1287 return nfserr_bad_xdr;
1288
1289 READ_BUF(4);
1290 exid->flags = be32_to_cpup(p++);
1291
1292 /* Ignore state_protect4_a */
1293 READ_BUF(4);
1294 exid->spa_how = be32_to_cpup(p++);
1295 switch (exid->spa_how) {
1296 case SP4_NONE:
1297 break;
1298 case SP4_MACH_CRED:
1299 /* spo_must_enforce */
1300 READ_BUF(4);
1301 dummy = be32_to_cpup(p++);
1302 READ_BUF(dummy * 4);
1303 p += dummy;
1304
1305 /* spo_must_allow */
1306 READ_BUF(4);
1307 dummy = be32_to_cpup(p++);
1308 READ_BUF(dummy * 4);
1309 p += dummy;
1310 break;
1311 case SP4_SSV:
1312 /* ssp_ops */
1313 READ_BUF(4);
1314 dummy = be32_to_cpup(p++);
1315 READ_BUF(dummy * 4);
1316 p += dummy;
1317
1318 READ_BUF(4);
1319 dummy = be32_to_cpup(p++);
1320 READ_BUF(dummy * 4);
1321 p += dummy;
1322
1323 /* ssp_hash_algs<> */
1324 READ_BUF(4);
1325 tmp = be32_to_cpup(p++);
1326 while (tmp--) {
1327 READ_BUF(4);
1328 dummy = be32_to_cpup(p++);
1329 READ_BUF(dummy);
1330 p += XDR_QUADLEN(dummy);
1331 }
1332
1333 /* ssp_encr_algs<> */
1334 READ_BUF(4);
1335 tmp = be32_to_cpup(p++);
1336 while (tmp--) {
1337 READ_BUF(4);
1338 dummy = be32_to_cpup(p++);
1339 READ_BUF(dummy);
1340 p += XDR_QUADLEN(dummy);
1341 }
1342
1343 /* ssp_window and ssp_num_gss_handles */
1344 READ_BUF(8);
1345 dummy = be32_to_cpup(p++);
1346 dummy = be32_to_cpup(p++);
1347 break;
1348 default:
1349 goto xdr_error;
1350 }
1351
1352 /* Ignore Implementation ID */
1353 READ_BUF(4); /* nfs_impl_id4 array length */
1354 dummy = be32_to_cpup(p++);
1355
1356 if (dummy > 1)
1357 goto xdr_error;
1358
1359 if (dummy == 1) {
1360 /* nii_domain */
1361 READ_BUF(4);
1362 dummy = be32_to_cpup(p++);
1363 READ_BUF(dummy);
1364 p += XDR_QUADLEN(dummy);
1365
1366 /* nii_name */
1367 READ_BUF(4);
1368 dummy = be32_to_cpup(p++);
1369 READ_BUF(dummy);
1370 p += XDR_QUADLEN(dummy);
1371
1372 /* nii_date */
1373 READ_BUF(12);
1374 p += 3;
1375 }
1376 DECODE_TAIL;
1377 }
1378
1379 static __be32
1380 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1381 struct nfsd4_create_session *sess)
1382 {
1383 DECODE_HEAD;
1384 u32 dummy;
1385
1386 READ_BUF(16);
1387 COPYMEM(&sess->clientid, 8);
1388 sess->seqid = be32_to_cpup(p++);
1389 sess->flags = be32_to_cpup(p++);
1390
1391 /* Fore channel attrs */
1392 READ_BUF(28);
1393 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1394 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1395 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1396 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1397 sess->fore_channel.maxops = be32_to_cpup(p++);
1398 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1399 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1400 if (sess->fore_channel.nr_rdma_attrs == 1) {
1401 READ_BUF(4);
1402 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1403 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1404 dprintk("Too many fore channel attr bitmaps!\n");
1405 goto xdr_error;
1406 }
1407
1408 /* Back channel attrs */
1409 READ_BUF(28);
1410 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1411 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1412 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1413 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1414 sess->back_channel.maxops = be32_to_cpup(p++);
1415 sess->back_channel.maxreqs = be32_to_cpup(p++);
1416 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1417 if (sess->back_channel.nr_rdma_attrs == 1) {
1418 READ_BUF(4);
1419 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1420 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1421 dprintk("Too many back channel attr bitmaps!\n");
1422 goto xdr_error;
1423 }
1424
1425 READ_BUF(4);
1426 sess->callback_prog = be32_to_cpup(p++);
1427 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1428 DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1433 struct nfsd4_destroy_session *destroy_session)
1434 {
1435 DECODE_HEAD;
1436 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1437 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1438
1439 DECODE_TAIL;
1440 }
1441
1442 static __be32
1443 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1444 struct nfsd4_free_stateid *free_stateid)
1445 {
1446 DECODE_HEAD;
1447
1448 READ_BUF(sizeof(stateid_t));
1449 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1450 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1451
1452 DECODE_TAIL;
1453 }
1454
1455 static __be32
1456 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1457 struct nfsd4_sequence *seq)
1458 {
1459 DECODE_HEAD;
1460
1461 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1462 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1463 seq->seqid = be32_to_cpup(p++);
1464 seq->slotid = be32_to_cpup(p++);
1465 seq->maxslots = be32_to_cpup(p++);
1466 seq->cachethis = be32_to_cpup(p++);
1467
1468 DECODE_TAIL;
1469 }
1470
1471 static __be32
1472 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1473 {
1474 int i;
1475 __be32 *p, status;
1476 struct nfsd4_test_stateid_id *stateid;
1477
1478 READ_BUF(4);
1479 test_stateid->ts_num_ids = ntohl(*p++);
1480
1481 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1482
1483 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1484 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1485 if (!stateid) {
1486 status = nfserrno(-ENOMEM);
1487 goto out;
1488 }
1489
1490 INIT_LIST_HEAD(&stateid->ts_id_list);
1491 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1492
1493 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1494 if (status)
1495 goto out;
1496 }
1497
1498 status = 0;
1499 out:
1500 return status;
1501 xdr_error:
1502 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1503 status = nfserr_bad_xdr;
1504 goto out;
1505 }
1506
1507 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1508 {
1509 DECODE_HEAD;
1510
1511 READ_BUF(8);
1512 COPYMEM(&dc->clientid, 8);
1513
1514 DECODE_TAIL;
1515 }
1516
1517 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1518 {
1519 DECODE_HEAD;
1520
1521 READ_BUF(4);
1522 rc->rca_one_fs = be32_to_cpup(p++);
1523
1524 DECODE_TAIL;
1525 }
1526
1527 #ifdef CONFIG_NFSD_PNFS
1528 static __be32
1529 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1530 struct nfsd4_getdeviceinfo *gdev)
1531 {
1532 DECODE_HEAD;
1533 u32 num, i;
1534
1535 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1536 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1537 gdev->gd_layout_type = be32_to_cpup(p++);
1538 gdev->gd_maxcount = be32_to_cpup(p++);
1539 num = be32_to_cpup(p++);
1540 if (num) {
1541 if (num > 1000)
1542 goto xdr_error;
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
1555 static __be32
1556 nfsd4_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
1579 static __be32
1580 nfsd4_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
1627 static __be32
1628 nfsd4_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
1662 static __be32
1663 nfsd4_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
1679 static __be32
1680 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1681 {
1682 DECODE_HEAD;
1683
1684 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1685 if (status)
1686 return status;
1687
1688 READ_BUF(8 + 4);
1689 p = xdr_decode_hyper(p, &seek->seek_offset);
1690 seek->seek_whence = be32_to_cpup(p);
1691
1692 DECODE_TAIL;
1693 }
1694
1695 static __be32
1696 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1697 {
1698 return nfs_ok;
1699 }
1700
1701 static __be32
1702 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1703 {
1704 return nfserr_notsupp;
1705 }
1706
1707 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1708
1709 static nfsd4_dec nfsd4_dec_ops[] = {
1710 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1711 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1712 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1713 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1714 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1715 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1716 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1717 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1718 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1719 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1720 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1721 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1722 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1723 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1724 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1725 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1726 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1727 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1728 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1729 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1730 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1731 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1732 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1733 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1734 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1735 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1736 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1737 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1738 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1739 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1740 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1741 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1742 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1743 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1744 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1745 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1746 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1747
1748 /* new operations for NFSv4.1 */
1749 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1750 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1751 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1752 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1753 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1754 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1755 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1756 #ifdef CONFIG_NFSD_PNFS
1757 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1758 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1759 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1760 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1761 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1762 #else
1763 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1764 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1765 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1766 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1767 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1768 #endif
1769 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1770 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1771 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1772 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1773 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1774 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1775 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1776
1777 /* new operations for NFSv4.2 */
1778 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1779 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1780 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1781 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1782 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1783 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1784 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1785 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1786 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1787 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1788 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1789 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1790 };
1791
1792 static inline bool
1793 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1794 {
1795 if (op->opnum < FIRST_NFS4_OP)
1796 return false;
1797 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1798 return false;
1799 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1800 return false;
1801 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1802 return false;
1803 return true;
1804 }
1805
1806 static __be32
1807 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1808 {
1809 DECODE_HEAD;
1810 struct nfsd4_op *op;
1811 bool cachethis = false;
1812 int auth_slack= argp->rqstp->rq_auth_slack;
1813 int max_reply = auth_slack + 8; /* opcnt, status */
1814 int readcount = 0;
1815 int readbytes = 0;
1816 int i;
1817
1818 READ_BUF(4);
1819 argp->taglen = be32_to_cpup(p++);
1820 READ_BUF(argp->taglen);
1821 SAVEMEM(argp->tag, argp->taglen);
1822 READ_BUF(8);
1823 argp->minorversion = be32_to_cpup(p++);
1824 argp->opcnt = be32_to_cpup(p++);
1825 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1826
1827 if (argp->taglen > NFSD4_MAX_TAGLEN)
1828 goto xdr_error;
1829 if (argp->opcnt > 100)
1830 goto xdr_error;
1831
1832 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1833 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1834 if (!argp->ops) {
1835 argp->ops = argp->iops;
1836 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1837 goto xdr_error;
1838 }
1839 }
1840
1841 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1842 argp->opcnt = 0;
1843
1844 for (i = 0; i < argp->opcnt; i++) {
1845 op = &argp->ops[i];
1846 op->replay = NULL;
1847
1848 READ_BUF(4);
1849 op->opnum = be32_to_cpup(p++);
1850
1851 if (nfsd4_opnum_in_range(argp, op))
1852 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1853 else {
1854 op->opnum = OP_ILLEGAL;
1855 op->status = nfserr_op_illegal;
1856 }
1857 /*
1858 * We'll try to cache the result in the DRC if any one
1859 * op in the compound wants to be cached:
1860 */
1861 cachethis |= nfsd4_cache_this_op(op);
1862
1863 if (op->opnum == OP_READ) {
1864 readcount++;
1865 readbytes += nfsd4_max_reply(argp->rqstp, op);
1866 } else
1867 max_reply += nfsd4_max_reply(argp->rqstp, op);
1868 /*
1869 * OP_LOCK may return a conflicting lock. (Special case
1870 * because it will just skip encoding this if it runs
1871 * out of xdr buffer space, and it is the only operation
1872 * that behaves this way.)
1873 */
1874 if (op->opnum == OP_LOCK)
1875 max_reply += NFS4_OPAQUE_LIMIT;
1876
1877 if (op->status) {
1878 argp->opcnt = i+1;
1879 break;
1880 }
1881 }
1882 /* Sessions make the DRC unnecessary: */
1883 if (argp->minorversion)
1884 cachethis = false;
1885 svc_reserve(argp->rqstp, max_reply + readbytes);
1886 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1887
1888 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1889 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1890
1891 DECODE_TAIL;
1892 }
1893
1894 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1895 {
1896 if (IS_I_VERSION(inode)) {
1897 p = xdr_encode_hyper(p, inode->i_version);
1898 } else {
1899 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1900 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1901 }
1902 return p;
1903 }
1904
1905 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1906 {
1907 *p++ = cpu_to_be32(c->atomic);
1908 if (c->change_supported) {
1909 p = xdr_encode_hyper(p, c->before_change);
1910 p = xdr_encode_hyper(p, c->after_change);
1911 } else {
1912 *p++ = cpu_to_be32(c->before_ctime_sec);
1913 *p++ = cpu_to_be32(c->before_ctime_nsec);
1914 *p++ = cpu_to_be32(c->after_ctime_sec);
1915 *p++ = cpu_to_be32(c->after_ctime_nsec);
1916 }
1917 return p;
1918 }
1919
1920 /* Encode as an array of strings the string given with components
1921 * separated @sep, escaped with esc_enter and esc_exit.
1922 */
1923 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1924 char *components, char esc_enter,
1925 char esc_exit)
1926 {
1927 __be32 *p;
1928 __be32 pathlen;
1929 int pathlen_offset;
1930 int strlen, count=0;
1931 char *str, *end, *next;
1932
1933 dprintk("nfsd4_encode_components(%s)\n", components);
1934
1935 pathlen_offset = xdr->buf->len;
1936 p = xdr_reserve_space(xdr, 4);
1937 if (!p)
1938 return nfserr_resource;
1939 p++; /* We will fill this in with @count later */
1940
1941 end = str = components;
1942 while (*end) {
1943 bool found_esc = false;
1944
1945 /* try to parse as esc_start, ..., esc_end, sep */
1946 if (*str == esc_enter) {
1947 for (; *end && (*end != esc_exit); end++)
1948 /* find esc_exit or end of string */;
1949 next = end + 1;
1950 if (*end && (!*next || *next == sep)) {
1951 str++;
1952 found_esc = true;
1953 }
1954 }
1955
1956 if (!found_esc)
1957 for (; *end && (*end != sep); end++)
1958 /* find sep or end of string */;
1959
1960 strlen = end - str;
1961 if (strlen) {
1962 p = xdr_reserve_space(xdr, strlen + 4);
1963 if (!p)
1964 return nfserr_resource;
1965 p = xdr_encode_opaque(p, str, strlen);
1966 count++;
1967 }
1968 else
1969 end++;
1970 if (found_esc)
1971 end = next;
1972
1973 str = end;
1974 }
1975 pathlen = htonl(count);
1976 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1977 return 0;
1978 }
1979
1980 /* Encode as an array of strings the string given with components
1981 * separated @sep.
1982 */
1983 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1984 char *components)
1985 {
1986 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1987 }
1988
1989 /*
1990 * encode a location element of a fs_locations structure
1991 */
1992 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1993 struct nfsd4_fs_location *location)
1994 {
1995 __be32 status;
1996
1997 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1998 '[', ']');
1999 if (status)
2000 return status;
2001 status = nfsd4_encode_components(xdr, '/', location->path);
2002 if (status)
2003 return status;
2004 return 0;
2005 }
2006
2007 /*
2008 * Encode a path in RFC3530 'pathname4' format
2009 */
2010 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2011 const struct path *root,
2012 const struct path *path)
2013 {
2014 struct path cur = *path;
2015 __be32 *p;
2016 struct dentry **components = NULL;
2017 unsigned int ncomponents = 0;
2018 __be32 err = nfserr_jukebox;
2019
2020 dprintk("nfsd4_encode_components(");
2021
2022 path_get(&cur);
2023 /* First walk the path up to the nfsd root, and store the
2024 * dentries/path components in an array.
2025 */
2026 for (;;) {
2027 if (path_equal(&cur, root))
2028 break;
2029 if (cur.dentry == cur.mnt->mnt_root) {
2030 if (follow_up(&cur))
2031 continue;
2032 goto out_free;
2033 }
2034 if ((ncomponents & 15) == 0) {
2035 struct dentry **new;
2036 new = krealloc(components,
2037 sizeof(*new) * (ncomponents + 16),
2038 GFP_KERNEL);
2039 if (!new)
2040 goto out_free;
2041 components = new;
2042 }
2043 components[ncomponents++] = cur.dentry;
2044 cur.dentry = dget_parent(cur.dentry);
2045 }
2046 err = nfserr_resource;
2047 p = xdr_reserve_space(xdr, 4);
2048 if (!p)
2049 goto out_free;
2050 *p++ = cpu_to_be32(ncomponents);
2051
2052 while (ncomponents) {
2053 struct dentry *dentry = components[ncomponents - 1];
2054 unsigned int len;
2055
2056 spin_lock(&dentry->d_lock);
2057 len = dentry->d_name.len;
2058 p = xdr_reserve_space(xdr, len + 4);
2059 if (!p) {
2060 spin_unlock(&dentry->d_lock);
2061 goto out_free;
2062 }
2063 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2064 dprintk("/%pd", dentry);
2065 spin_unlock(&dentry->d_lock);
2066 dput(dentry);
2067 ncomponents--;
2068 }
2069
2070 err = 0;
2071 out_free:
2072 dprintk(")\n");
2073 while (ncomponents)
2074 dput(components[--ncomponents]);
2075 kfree(components);
2076 path_put(&cur);
2077 return err;
2078 }
2079
2080 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2081 struct svc_rqst *rqstp, const struct path *path)
2082 {
2083 struct svc_export *exp_ps;
2084 __be32 res;
2085
2086 exp_ps = rqst_find_fsidzero_export(rqstp);
2087 if (IS_ERR(exp_ps))
2088 return nfserrno(PTR_ERR(exp_ps));
2089 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2090 exp_put(exp_ps);
2091 return res;
2092 }
2093
2094 /*
2095 * encode a fs_locations structure
2096 */
2097 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2098 struct svc_rqst *rqstp, struct svc_export *exp)
2099 {
2100 __be32 status;
2101 int i;
2102 __be32 *p;
2103 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2104
2105 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2106 if (status)
2107 return status;
2108 p = xdr_reserve_space(xdr, 4);
2109 if (!p)
2110 return nfserr_resource;
2111 *p++ = cpu_to_be32(fslocs->locations_count);
2112 for (i=0; i<fslocs->locations_count; i++) {
2113 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2114 if (status)
2115 return status;
2116 }
2117 return 0;
2118 }
2119
2120 static u32 nfs4_file_type(umode_t mode)
2121 {
2122 switch (mode & S_IFMT) {
2123 case S_IFIFO: return NF4FIFO;
2124 case S_IFCHR: return NF4CHR;
2125 case S_IFDIR: return NF4DIR;
2126 case S_IFBLK: return NF4BLK;
2127 case S_IFLNK: return NF4LNK;
2128 case S_IFREG: return NF4REG;
2129 case S_IFSOCK: return NF4SOCK;
2130 default: return NF4BAD;
2131 };
2132 }
2133
2134 static inline __be32
2135 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2136 struct nfs4_ace *ace)
2137 {
2138 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2139 return nfs4_acl_write_who(xdr, ace->whotype);
2140 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2141 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2142 else
2143 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2144 }
2145
2146 static inline __be32
2147 nfsd4_encode_layout_type(struct xdr_stream *xdr, enum pnfs_layouttype layout_type)
2148 {
2149 __be32 *p;
2150
2151 if (layout_type) {
2152 p = xdr_reserve_space(xdr, 8);
2153 if (!p)
2154 return nfserr_resource;
2155 *p++ = cpu_to_be32(1);
2156 *p++ = cpu_to_be32(layout_type);
2157 } else {
2158 p = xdr_reserve_space(xdr, 4);
2159 if (!p)
2160 return nfserr_resource;
2161 *p++ = cpu_to_be32(0);
2162 }
2163
2164 return 0;
2165 }
2166
2167 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2168 FATTR4_WORD0_RDATTR_ERROR)
2169 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2170 #define WORD2_ABSENT_FS_ATTRS 0
2171
2172 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2173 static inline __be32
2174 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2175 void *context, int len)
2176 {
2177 __be32 *p;
2178
2179 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2180 if (!p)
2181 return nfserr_resource;
2182
2183 /*
2184 * For now we use a 0 here to indicate the null translation; in
2185 * the future we may place a call to translation code here.
2186 */
2187 *p++ = cpu_to_be32(0); /* lfs */
2188 *p++ = cpu_to_be32(0); /* pi */
2189 p = xdr_encode_opaque(p, context, len);
2190 return 0;
2191 }
2192 #else
2193 static inline __be32
2194 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2195 void *context, int len)
2196 { return 0; }
2197 #endif
2198
2199 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2200 {
2201 /* As per referral draft: */
2202 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2203 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2204 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2205 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2206 *rdattr_err = NFSERR_MOVED;
2207 else
2208 return nfserr_moved;
2209 }
2210 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2211 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2212 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2213 return 0;
2214 }
2215
2216
2217 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2218 {
2219 struct path path = exp->ex_path;
2220 int err;
2221
2222 path_get(&path);
2223 while (follow_up(&path)) {
2224 if (path.dentry != path.mnt->mnt_root)
2225 break;
2226 }
2227 err = vfs_getattr(&path, stat);
2228 path_put(&path);
2229 return err;
2230 }
2231
2232 static __be32
2233 nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2234 {
2235 __be32 *p;
2236
2237 if (bmval2) {
2238 p = xdr_reserve_space(xdr, 16);
2239 if (!p)
2240 goto out_resource;
2241 *p++ = cpu_to_be32(3);
2242 *p++ = cpu_to_be32(bmval0);
2243 *p++ = cpu_to_be32(bmval1);
2244 *p++ = cpu_to_be32(bmval2);
2245 } else if (bmval1) {
2246 p = xdr_reserve_space(xdr, 12);
2247 if (!p)
2248 goto out_resource;
2249 *p++ = cpu_to_be32(2);
2250 *p++ = cpu_to_be32(bmval0);
2251 *p++ = cpu_to_be32(bmval1);
2252 } else {
2253 p = xdr_reserve_space(xdr, 8);
2254 if (!p)
2255 goto out_resource;
2256 *p++ = cpu_to_be32(1);
2257 *p++ = cpu_to_be32(bmval0);
2258 }
2259
2260 return 0;
2261 out_resource:
2262 return nfserr_resource;
2263 }
2264
2265 /*
2266 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2267 * ourselves.
2268 */
2269 static __be32
2270 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2271 struct svc_export *exp,
2272 struct dentry *dentry, u32 *bmval,
2273 struct svc_rqst *rqstp, int ignore_crossmnt)
2274 {
2275 u32 bmval0 = bmval[0];
2276 u32 bmval1 = bmval[1];
2277 u32 bmval2 = bmval[2];
2278 struct kstat stat;
2279 struct svc_fh *tempfh = NULL;
2280 struct kstatfs statfs;
2281 __be32 *p;
2282 int starting_len = xdr->buf->len;
2283 int attrlen_offset;
2284 __be32 attrlen;
2285 u32 dummy;
2286 u64 dummy64;
2287 u32 rdattr_err = 0;
2288 __be32 status;
2289 int err;
2290 struct nfs4_acl *acl = NULL;
2291 void *context = NULL;
2292 int contextlen;
2293 bool contextsupport = false;
2294 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2295 u32 minorversion = resp->cstate.minorversion;
2296 struct path path = {
2297 .mnt = exp->ex_path.mnt,
2298 .dentry = dentry,
2299 };
2300 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2301
2302 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2303 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2304 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2305 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2306
2307 if (exp->ex_fslocs.migrated) {
2308 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2309 if (status)
2310 goto out;
2311 }
2312
2313 err = vfs_getattr(&path, &stat);
2314 if (err)
2315 goto out_nfserr;
2316 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2317 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2318 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2319 FATTR4_WORD1_SPACE_TOTAL))) {
2320 err = vfs_statfs(&path, &statfs);
2321 if (err)
2322 goto out_nfserr;
2323 }
2324 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2325 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2326 status = nfserr_jukebox;
2327 if (!tempfh)
2328 goto out;
2329 fh_init(tempfh, NFS4_FHSIZE);
2330 status = fh_compose(tempfh, exp, dentry, NULL);
2331 if (status)
2332 goto out;
2333 fhp = tempfh;
2334 }
2335 if (bmval0 & FATTR4_WORD0_ACL) {
2336 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2337 if (err == -EOPNOTSUPP)
2338 bmval0 &= ~FATTR4_WORD0_ACL;
2339 else if (err == -EINVAL) {
2340 status = nfserr_attrnotsupp;
2341 goto out;
2342 } else if (err != 0)
2343 goto out_nfserr;
2344 }
2345
2346 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2347 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2348 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2349 err = security_inode_getsecctx(d_inode(dentry),
2350 &context, &contextlen);
2351 contextsupport = (err == 0);
2352 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2353 if (err == -EOPNOTSUPP)
2354 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2355 else if (err)
2356 goto out_nfserr;
2357 }
2358 }
2359 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2360
2361 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2362 if (status)
2363 goto out;
2364
2365 attrlen_offset = xdr->buf->len;
2366 p = xdr_reserve_space(xdr, 4);
2367 if (!p)
2368 goto out_resource;
2369 p++; /* to be backfilled later */
2370
2371 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2372 u32 word0 = nfsd_suppattrs0(minorversion);
2373 u32 word1 = nfsd_suppattrs1(minorversion);
2374 u32 word2 = nfsd_suppattrs2(minorversion);
2375
2376 if (!IS_POSIXACL(dentry->d_inode))
2377 word0 &= ~FATTR4_WORD0_ACL;
2378 if (!contextsupport)
2379 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2380 if (!word2) {
2381 p = xdr_reserve_space(xdr, 12);
2382 if (!p)
2383 goto out_resource;
2384 *p++ = cpu_to_be32(2);
2385 *p++ = cpu_to_be32(word0);
2386 *p++ = cpu_to_be32(word1);
2387 } else {
2388 p = xdr_reserve_space(xdr, 16);
2389 if (!p)
2390 goto out_resource;
2391 *p++ = cpu_to_be32(3);
2392 *p++ = cpu_to_be32(word0);
2393 *p++ = cpu_to_be32(word1);
2394 *p++ = cpu_to_be32(word2);
2395 }
2396 }
2397 if (bmval0 & FATTR4_WORD0_TYPE) {
2398 p = xdr_reserve_space(xdr, 4);
2399 if (!p)
2400 goto out_resource;
2401 dummy = nfs4_file_type(stat.mode);
2402 if (dummy == NF4BAD) {
2403 status = nfserr_serverfault;
2404 goto out;
2405 }
2406 *p++ = cpu_to_be32(dummy);
2407 }
2408 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2409 p = xdr_reserve_space(xdr, 4);
2410 if (!p)
2411 goto out_resource;
2412 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2413 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2414 else
2415 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2416 NFS4_FH_VOL_RENAME);
2417 }
2418 if (bmval0 & FATTR4_WORD0_CHANGE) {
2419 p = xdr_reserve_space(xdr, 8);
2420 if (!p)
2421 goto out_resource;
2422 p = encode_change(p, &stat, d_inode(dentry));
2423 }
2424 if (bmval0 & FATTR4_WORD0_SIZE) {
2425 p = xdr_reserve_space(xdr, 8);
2426 if (!p)
2427 goto out_resource;
2428 p = xdr_encode_hyper(p, stat.size);
2429 }
2430 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2431 p = xdr_reserve_space(xdr, 4);
2432 if (!p)
2433 goto out_resource;
2434 *p++ = cpu_to_be32(1);
2435 }
2436 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2437 p = xdr_reserve_space(xdr, 4);
2438 if (!p)
2439 goto out_resource;
2440 *p++ = cpu_to_be32(1);
2441 }
2442 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2443 p = xdr_reserve_space(xdr, 4);
2444 if (!p)
2445 goto out_resource;
2446 *p++ = cpu_to_be32(0);
2447 }
2448 if (bmval0 & FATTR4_WORD0_FSID) {
2449 p = xdr_reserve_space(xdr, 16);
2450 if (!p)
2451 goto out_resource;
2452 if (exp->ex_fslocs.migrated) {
2453 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2454 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2455 } else switch(fsid_source(fhp)) {
2456 case FSIDSOURCE_FSID:
2457 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2458 p = xdr_encode_hyper(p, (u64)0);
2459 break;
2460 case FSIDSOURCE_DEV:
2461 *p++ = cpu_to_be32(0);
2462 *p++ = cpu_to_be32(MAJOR(stat.dev));
2463 *p++ = cpu_to_be32(0);
2464 *p++ = cpu_to_be32(MINOR(stat.dev));
2465 break;
2466 case FSIDSOURCE_UUID:
2467 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2468 EX_UUID_LEN);
2469 break;
2470 }
2471 }
2472 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2473 p = xdr_reserve_space(xdr, 4);
2474 if (!p)
2475 goto out_resource;
2476 *p++ = cpu_to_be32(0);
2477 }
2478 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2479 p = xdr_reserve_space(xdr, 4);
2480 if (!p)
2481 goto out_resource;
2482 *p++ = cpu_to_be32(nn->nfsd4_lease);
2483 }
2484 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2485 p = xdr_reserve_space(xdr, 4);
2486 if (!p)
2487 goto out_resource;
2488 *p++ = cpu_to_be32(rdattr_err);
2489 }
2490 if (bmval0 & FATTR4_WORD0_ACL) {
2491 struct nfs4_ace *ace;
2492
2493 if (acl == NULL) {
2494 p = xdr_reserve_space(xdr, 4);
2495 if (!p)
2496 goto out_resource;
2497
2498 *p++ = cpu_to_be32(0);
2499 goto out_acl;
2500 }
2501 p = xdr_reserve_space(xdr, 4);
2502 if (!p)
2503 goto out_resource;
2504 *p++ = cpu_to_be32(acl->naces);
2505
2506 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2507 p = xdr_reserve_space(xdr, 4*3);
2508 if (!p)
2509 goto out_resource;
2510 *p++ = cpu_to_be32(ace->type);
2511 *p++ = cpu_to_be32(ace->flag);
2512 *p++ = cpu_to_be32(ace->access_mask &
2513 NFS4_ACE_MASK_ALL);
2514 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2515 if (status)
2516 goto out;
2517 }
2518 }
2519 out_acl:
2520 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2521 p = xdr_reserve_space(xdr, 4);
2522 if (!p)
2523 goto out_resource;
2524 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2525 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2526 }
2527 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2528 p = xdr_reserve_space(xdr, 4);
2529 if (!p)
2530 goto out_resource;
2531 *p++ = cpu_to_be32(1);
2532 }
2533 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2534 p = xdr_reserve_space(xdr, 4);
2535 if (!p)
2536 goto out_resource;
2537 *p++ = cpu_to_be32(0);
2538 }
2539 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2540 p = xdr_reserve_space(xdr, 4);
2541 if (!p)
2542 goto out_resource;
2543 *p++ = cpu_to_be32(1);
2544 }
2545 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2546 p = xdr_reserve_space(xdr, 4);
2547 if (!p)
2548 goto out_resource;
2549 *p++ = cpu_to_be32(1);
2550 }
2551 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2552 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2553 if (!p)
2554 goto out_resource;
2555 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2556 fhp->fh_handle.fh_size);
2557 }
2558 if (bmval0 & FATTR4_WORD0_FILEID) {
2559 p = xdr_reserve_space(xdr, 8);
2560 if (!p)
2561 goto out_resource;
2562 p = xdr_encode_hyper(p, stat.ino);
2563 }
2564 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2565 p = xdr_reserve_space(xdr, 8);
2566 if (!p)
2567 goto out_resource;
2568 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2569 }
2570 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2571 p = xdr_reserve_space(xdr, 8);
2572 if (!p)
2573 goto out_resource;
2574 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2575 }
2576 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2577 p = xdr_reserve_space(xdr, 8);
2578 if (!p)
2579 goto out_resource;
2580 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2581 }
2582 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2583 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2584 if (status)
2585 goto out;
2586 }
2587 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2588 p = xdr_reserve_space(xdr, 4);
2589 if (!p)
2590 goto out_resource;
2591 *p++ = cpu_to_be32(1);
2592 }
2593 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2594 p = xdr_reserve_space(xdr, 8);
2595 if (!p)
2596 goto out_resource;
2597 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2598 }
2599 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2600 p = xdr_reserve_space(xdr, 4);
2601 if (!p)
2602 goto out_resource;
2603 *p++ = cpu_to_be32(255);
2604 }
2605 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2606 p = xdr_reserve_space(xdr, 4);
2607 if (!p)
2608 goto out_resource;
2609 *p++ = cpu_to_be32(statfs.f_namelen);
2610 }
2611 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2612 p = xdr_reserve_space(xdr, 8);
2613 if (!p)
2614 goto out_resource;
2615 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2616 }
2617 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2618 p = xdr_reserve_space(xdr, 8);
2619 if (!p)
2620 goto out_resource;
2621 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2622 }
2623 if (bmval1 & FATTR4_WORD1_MODE) {
2624 p = xdr_reserve_space(xdr, 4);
2625 if (!p)
2626 goto out_resource;
2627 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2628 }
2629 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2630 p = xdr_reserve_space(xdr, 4);
2631 if (!p)
2632 goto out_resource;
2633 *p++ = cpu_to_be32(1);
2634 }
2635 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2636 p = xdr_reserve_space(xdr, 4);
2637 if (!p)
2638 goto out_resource;
2639 *p++ = cpu_to_be32(stat.nlink);
2640 }
2641 if (bmval1 & FATTR4_WORD1_OWNER) {
2642 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2643 if (status)
2644 goto out;
2645 }
2646 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2647 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2648 if (status)
2649 goto out;
2650 }
2651 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2652 p = xdr_reserve_space(xdr, 8);
2653 if (!p)
2654 goto out_resource;
2655 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2656 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2657 }
2658 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2659 p = xdr_reserve_space(xdr, 8);
2660 if (!p)
2661 goto out_resource;
2662 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2663 p = xdr_encode_hyper(p, dummy64);
2664 }
2665 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2666 p = xdr_reserve_space(xdr, 8);
2667 if (!p)
2668 goto out_resource;
2669 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2670 p = xdr_encode_hyper(p, dummy64);
2671 }
2672 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2673 p = xdr_reserve_space(xdr, 8);
2674 if (!p)
2675 goto out_resource;
2676 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2677 p = xdr_encode_hyper(p, dummy64);
2678 }
2679 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2680 p = xdr_reserve_space(xdr, 8);
2681 if (!p)
2682 goto out_resource;
2683 dummy64 = (u64)stat.blocks << 9;
2684 p = xdr_encode_hyper(p, dummy64);
2685 }
2686 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2687 p = xdr_reserve_space(xdr, 12);
2688 if (!p)
2689 goto out_resource;
2690 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2691 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2692 }
2693 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2694 p = xdr_reserve_space(xdr, 12);
2695 if (!p)
2696 goto out_resource;
2697 *p++ = cpu_to_be32(0);
2698 *p++ = cpu_to_be32(1);
2699 *p++ = cpu_to_be32(0);
2700 }
2701 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2702 p = xdr_reserve_space(xdr, 12);
2703 if (!p)
2704 goto out_resource;
2705 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2706 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2707 }
2708 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2709 p = xdr_reserve_space(xdr, 12);
2710 if (!p)
2711 goto out_resource;
2712 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2713 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2714 }
2715 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2716 struct kstat parent_stat;
2717 u64 ino = stat.ino;
2718
2719 p = xdr_reserve_space(xdr, 8);
2720 if (!p)
2721 goto out_resource;
2722 /*
2723 * Get parent's attributes if not ignoring crossmount
2724 * and this is the root of a cross-mounted filesystem.
2725 */
2726 if (ignore_crossmnt == 0 &&
2727 dentry == exp->ex_path.mnt->mnt_root) {
2728 err = get_parent_attributes(exp, &parent_stat);
2729 if (err)
2730 goto out_nfserr;
2731 ino = parent_stat.ino;
2732 }
2733 p = xdr_encode_hyper(p, ino);
2734 }
2735 #ifdef CONFIG_NFSD_PNFS
2736 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2737 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2738 if (status)
2739 goto out;
2740 }
2741
2742 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2743 status = nfsd4_encode_layout_type(xdr, exp->ex_layout_type);
2744 if (status)
2745 goto out;
2746 }
2747
2748 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2749 p = xdr_reserve_space(xdr, 4);
2750 if (!p)
2751 goto out_resource;
2752 *p++ = cpu_to_be32(stat.blksize);
2753 }
2754 #endif /* CONFIG_NFSD_PNFS */
2755 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2756 u32 supp[3];
2757
2758 supp[0] = nfsd_suppattrs0(minorversion);
2759 supp[1] = nfsd_suppattrs1(minorversion);
2760 supp[2] = nfsd_suppattrs2(minorversion);
2761 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2762 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2763 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2764
2765 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2766 if (status)
2767 goto out;
2768 }
2769
2770 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2771 status = nfsd4_encode_security_label(xdr, rqstp, context,
2772 contextlen);
2773 if (status)
2774 goto out;
2775 }
2776
2777 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2778 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2779 status = nfs_ok;
2780
2781 out:
2782 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2783 if (context)
2784 security_release_secctx(context, contextlen);
2785 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2786 kfree(acl);
2787 if (tempfh) {
2788 fh_put(tempfh);
2789 kfree(tempfh);
2790 }
2791 if (status)
2792 xdr_truncate_encode(xdr, starting_len);
2793 return status;
2794 out_nfserr:
2795 status = nfserrno(err);
2796 goto out;
2797 out_resource:
2798 status = nfserr_resource;
2799 goto out;
2800 }
2801
2802 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2803 struct xdr_buf *buf, __be32 *p, int bytes)
2804 {
2805 xdr->scratch.iov_len = 0;
2806 memset(buf, 0, sizeof(struct xdr_buf));
2807 buf->head[0].iov_base = p;
2808 buf->head[0].iov_len = 0;
2809 buf->len = 0;
2810 xdr->buf = buf;
2811 xdr->iov = buf->head;
2812 xdr->p = p;
2813 xdr->end = (void *)p + bytes;
2814 buf->buflen = bytes;
2815 }
2816
2817 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2818 struct svc_fh *fhp, struct svc_export *exp,
2819 struct dentry *dentry, u32 *bmval,
2820 struct svc_rqst *rqstp, int ignore_crossmnt)
2821 {
2822 struct xdr_buf dummy;
2823 struct xdr_stream xdr;
2824 __be32 ret;
2825
2826 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2827 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2828 ignore_crossmnt);
2829 *p = xdr.p;
2830 return ret;
2831 }
2832
2833 static inline int attributes_need_mount(u32 *bmval)
2834 {
2835 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2836 return 1;
2837 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2838 return 1;
2839 return 0;
2840 }
2841
2842 static __be32
2843 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2844 const char *name, int namlen)
2845 {
2846 struct svc_export *exp = cd->rd_fhp->fh_export;
2847 struct dentry *dentry;
2848 __be32 nfserr;
2849 int ignore_crossmnt = 0;
2850
2851 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2852 if (IS_ERR(dentry))
2853 return nfserrno(PTR_ERR(dentry));
2854 if (d_really_is_negative(dentry)) {
2855 /*
2856 * nfsd_buffered_readdir drops the i_mutex between
2857 * readdir and calling this callback, leaving a window
2858 * where this directory entry could have gone away.
2859 */
2860 dput(dentry);
2861 return nfserr_noent;
2862 }
2863
2864 exp_get(exp);
2865 /*
2866 * In the case of a mountpoint, the client may be asking for
2867 * attributes that are only properties of the underlying filesystem
2868 * as opposed to the cross-mounted file system. In such a case,
2869 * we will not follow the cross mount and will fill the attribtutes
2870 * directly from the mountpoint dentry.
2871 */
2872 if (nfsd_mountpoint(dentry, exp)) {
2873 int err;
2874
2875 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2876 && !attributes_need_mount(cd->rd_bmval)) {
2877 ignore_crossmnt = 1;
2878 goto out_encode;
2879 }
2880 /*
2881 * Why the heck aren't we just using nfsd_lookup??
2882 * Different "."/".." handling? Something else?
2883 * At least, add a comment here to explain....
2884 */
2885 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2886 if (err) {
2887 nfserr = nfserrno(err);
2888 goto out_put;
2889 }
2890 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2891 if (nfserr)
2892 goto out_put;
2893
2894 }
2895 out_encode:
2896 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2897 cd->rd_rqstp, ignore_crossmnt);
2898 out_put:
2899 dput(dentry);
2900 exp_put(exp);
2901 return nfserr;
2902 }
2903
2904 static __be32 *
2905 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2906 {
2907 __be32 *p;
2908
2909 p = xdr_reserve_space(xdr, 20);
2910 if (!p)
2911 return NULL;
2912 *p++ = htonl(2);
2913 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2914 *p++ = htonl(0); /* bmval1 */
2915
2916 *p++ = htonl(4); /* attribute length */
2917 *p++ = nfserr; /* no htonl */
2918 return p;
2919 }
2920
2921 static int
2922 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2923 loff_t offset, u64 ino, unsigned int d_type)
2924 {
2925 struct readdir_cd *ccd = ccdv;
2926 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2927 struct xdr_stream *xdr = cd->xdr;
2928 int start_offset = xdr->buf->len;
2929 int cookie_offset;
2930 u32 name_and_cookie;
2931 int entry_bytes;
2932 __be32 nfserr = nfserr_toosmall;
2933 __be64 wire_offset;
2934 __be32 *p;
2935
2936 /* In nfsv4, "." and ".." never make it onto the wire.. */
2937 if (name && isdotent(name, namlen)) {
2938 cd->common.err = nfs_ok;
2939 return 0;
2940 }
2941
2942 if (cd->cookie_offset) {
2943 wire_offset = cpu_to_be64(offset);
2944 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2945 &wire_offset, 8);
2946 }
2947
2948 p = xdr_reserve_space(xdr, 4);
2949 if (!p)
2950 goto fail;
2951 *p++ = xdr_one; /* mark entry present */
2952 cookie_offset = xdr->buf->len;
2953 p = xdr_reserve_space(xdr, 3*4 + namlen);
2954 if (!p)
2955 goto fail;
2956 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2957 p = xdr_encode_array(p, name, namlen); /* name length & name */
2958
2959 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2960 switch (nfserr) {
2961 case nfs_ok:
2962 break;
2963 case nfserr_resource:
2964 nfserr = nfserr_toosmall;
2965 goto fail;
2966 case nfserr_noent:
2967 xdr_truncate_encode(xdr, start_offset);
2968 goto skip_entry;
2969 default:
2970 /*
2971 * If the client requested the RDATTR_ERROR attribute,
2972 * we stuff the error code into this attribute
2973 * and continue. If this attribute was not requested,
2974 * then in accordance with the spec, we fail the
2975 * entire READDIR operation(!)
2976 */
2977 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2978 goto fail;
2979 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2980 if (p == NULL) {
2981 nfserr = nfserr_toosmall;
2982 goto fail;
2983 }
2984 }
2985 nfserr = nfserr_toosmall;
2986 entry_bytes = xdr->buf->len - start_offset;
2987 if (entry_bytes > cd->rd_maxcount)
2988 goto fail;
2989 cd->rd_maxcount -= entry_bytes;
2990 /*
2991 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2992 * let's always let through the first entry, at least:
2993 */
2994 if (!cd->rd_dircount)
2995 goto fail;
2996 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
2997 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2998 goto fail;
2999 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3000
3001 cd->cookie_offset = cookie_offset;
3002 skip_entry:
3003 cd->common.err = nfs_ok;
3004 return 0;
3005 fail:
3006 xdr_truncate_encode(xdr, start_offset);
3007 cd->common.err = nfserr;
3008 return -EINVAL;
3009 }
3010
3011 static __be32
3012 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3013 {
3014 __be32 *p;
3015
3016 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3017 if (!p)
3018 return nfserr_resource;
3019 *p++ = cpu_to_be32(sid->si_generation);
3020 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3021 sizeof(stateid_opaque_t));
3022 return 0;
3023 }
3024
3025 static __be32
3026 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3027 {
3028 struct xdr_stream *xdr = &resp->xdr;
3029 __be32 *p;
3030
3031 if (!nfserr) {
3032 p = xdr_reserve_space(xdr, 8);
3033 if (!p)
3034 return nfserr_resource;
3035 *p++ = cpu_to_be32(access->ac_supported);
3036 *p++ = cpu_to_be32(access->ac_resp_access);
3037 }
3038 return nfserr;
3039 }
3040
3041 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3042 {
3043 struct xdr_stream *xdr = &resp->xdr;
3044 __be32 *p;
3045
3046 if (!nfserr) {
3047 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3048 if (!p)
3049 return nfserr_resource;
3050 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3051 NFS4_MAX_SESSIONID_LEN);
3052 *p++ = cpu_to_be32(bcts->dir);
3053 /* Sorry, we do not yet support RDMA over 4.1: */
3054 *p++ = cpu_to_be32(0);
3055 }
3056 return nfserr;
3057 }
3058
3059 static __be32
3060 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3061 {
3062 struct xdr_stream *xdr = &resp->xdr;
3063
3064 if (!nfserr)
3065 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
3066
3067 return nfserr;
3068 }
3069
3070
3071 static __be32
3072 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3073 {
3074 struct xdr_stream *xdr = &resp->xdr;
3075 __be32 *p;
3076
3077 if (!nfserr) {
3078 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3079 if (!p)
3080 return nfserr_resource;
3081 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3082 NFS4_VERIFIER_SIZE);
3083 }
3084 return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3089 {
3090 struct xdr_stream *xdr = &resp->xdr;
3091 __be32 *p;
3092
3093 if (!nfserr) {
3094 p = xdr_reserve_space(xdr, 20);
3095 if (!p)
3096 return nfserr_resource;
3097 encode_cinfo(p, &create->cr_cinfo);
3098 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3099 create->cr_bmval[1], create->cr_bmval[2]);
3100 }
3101 return nfserr;
3102 }
3103
3104 static __be32
3105 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3106 {
3107 struct svc_fh *fhp = getattr->ga_fhp;
3108 struct xdr_stream *xdr = &resp->xdr;
3109
3110 if (nfserr)
3111 return nfserr;
3112
3113 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3114 getattr->ga_bmval,
3115 resp->rqstp, 0);
3116 return nfserr;
3117 }
3118
3119 static __be32
3120 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3121 {
3122 struct xdr_stream *xdr = &resp->xdr;
3123 struct svc_fh *fhp = *fhpp;
3124 unsigned int len;
3125 __be32 *p;
3126
3127 if (!nfserr) {
3128 len = fhp->fh_handle.fh_size;
3129 p = xdr_reserve_space(xdr, len + 4);
3130 if (!p)
3131 return nfserr_resource;
3132 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3133 }
3134 return nfserr;
3135 }
3136
3137 /*
3138 * Including all fields other than the name, a LOCK4denied structure requires
3139 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3140 */
3141 static __be32
3142 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3143 {
3144 struct xdr_netobj *conf = &ld->ld_owner;
3145 __be32 *p;
3146
3147 again:
3148 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3149 if (!p) {
3150 /*
3151 * Don't fail to return the result just because we can't
3152 * return the conflicting open:
3153 */
3154 if (conf->len) {
3155 kfree(conf->data);
3156 conf->len = 0;
3157 conf->data = NULL;
3158 goto again;
3159 }
3160 return nfserr_resource;
3161 }
3162 p = xdr_encode_hyper(p, ld->ld_start);
3163 p = xdr_encode_hyper(p, ld->ld_length);
3164 *p++ = cpu_to_be32(ld->ld_type);
3165 if (conf->len) {
3166 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3167 p = xdr_encode_opaque(p, conf->data, conf->len);
3168 kfree(conf->data);
3169 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3170 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3171 *p++ = cpu_to_be32(0); /* length of owner name */
3172 }
3173 return nfserr_denied;
3174 }
3175
3176 static __be32
3177 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3178 {
3179 struct xdr_stream *xdr = &resp->xdr;
3180
3181 if (!nfserr)
3182 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3183 else if (nfserr == nfserr_denied)
3184 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3185
3186 return nfserr;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3191 {
3192 struct xdr_stream *xdr = &resp->xdr;
3193
3194 if (nfserr == nfserr_denied)
3195 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3196 return nfserr;
3197 }
3198
3199 static __be32
3200 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3201 {
3202 struct xdr_stream *xdr = &resp->xdr;
3203
3204 if (!nfserr)
3205 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3206
3207 return nfserr;
3208 }
3209
3210
3211 static __be32
3212 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3213 {
3214 struct xdr_stream *xdr = &resp->xdr;
3215 __be32 *p;
3216
3217 if (!nfserr) {
3218 p = xdr_reserve_space(xdr, 20);
3219 if (!p)
3220 return nfserr_resource;
3221 p = encode_cinfo(p, &link->li_cinfo);
3222 }
3223 return nfserr;
3224 }
3225
3226
3227 static __be32
3228 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3229 {
3230 struct xdr_stream *xdr = &resp->xdr;
3231 __be32 *p;
3232
3233 if (nfserr)
3234 goto out;
3235
3236 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3237 if (nfserr)
3238 goto out;
3239 p = xdr_reserve_space(xdr, 24);
3240 if (!p)
3241 return nfserr_resource;
3242 p = encode_cinfo(p, &open->op_cinfo);
3243 *p++ = cpu_to_be32(open->op_rflags);
3244
3245 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3246 open->op_bmval[2]);
3247 if (nfserr)
3248 goto out;
3249
3250 p = xdr_reserve_space(xdr, 4);
3251 if (!p)
3252 return nfserr_resource;
3253
3254 *p++ = cpu_to_be32(open->op_delegate_type);
3255 switch (open->op_delegate_type) {
3256 case NFS4_OPEN_DELEGATE_NONE:
3257 break;
3258 case NFS4_OPEN_DELEGATE_READ:
3259 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3260 if (nfserr)
3261 return nfserr;
3262 p = xdr_reserve_space(xdr, 20);
3263 if (!p)
3264 return nfserr_resource;
3265 *p++ = cpu_to_be32(open->op_recall);
3266
3267 /*
3268 * TODO: ACE's in delegations
3269 */
3270 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3271 *p++ = cpu_to_be32(0);
3272 *p++ = cpu_to_be32(0);
3273 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3274 break;
3275 case NFS4_OPEN_DELEGATE_WRITE:
3276 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3277 if (nfserr)
3278 return nfserr;
3279 p = xdr_reserve_space(xdr, 32);
3280 if (!p)
3281 return nfserr_resource;
3282 *p++ = cpu_to_be32(0);
3283
3284 /*
3285 * TODO: space_limit's in delegations
3286 */
3287 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3288 *p++ = cpu_to_be32(~(u32)0);
3289 *p++ = cpu_to_be32(~(u32)0);
3290
3291 /*
3292 * TODO: ACE's in delegations
3293 */
3294 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3295 *p++ = cpu_to_be32(0);
3296 *p++ = cpu_to_be32(0);
3297 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3298 break;
3299 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3300 switch (open->op_why_no_deleg) {
3301 case WND4_CONTENTION:
3302 case WND4_RESOURCE:
3303 p = xdr_reserve_space(xdr, 8);
3304 if (!p)
3305 return nfserr_resource;
3306 *p++ = cpu_to_be32(open->op_why_no_deleg);
3307 /* deleg signaling not supported yet: */
3308 *p++ = cpu_to_be32(0);
3309 break;
3310 default:
3311 p = xdr_reserve_space(xdr, 4);
3312 if (!p)
3313 return nfserr_resource;
3314 *p++ = cpu_to_be32(open->op_why_no_deleg);
3315 }
3316 break;
3317 default:
3318 BUG();
3319 }
3320 /* XXX save filehandle here */
3321 out:
3322 return nfserr;
3323 }
3324
3325 static __be32
3326 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3327 {
3328 struct xdr_stream *xdr = &resp->xdr;
3329
3330 if (!nfserr)
3331 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3332
3333 return nfserr;
3334 }
3335
3336 static __be32
3337 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3338 {
3339 struct xdr_stream *xdr = &resp->xdr;
3340
3341 if (!nfserr)
3342 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3343
3344 return nfserr;
3345 }
3346
3347 static __be32 nfsd4_encode_splice_read(
3348 struct nfsd4_compoundres *resp,
3349 struct nfsd4_read *read,
3350 struct file *file, unsigned long maxcount)
3351 {
3352 struct xdr_stream *xdr = &resp->xdr;
3353 struct xdr_buf *buf = xdr->buf;
3354 u32 eof;
3355 int space_left;
3356 __be32 nfserr;
3357 __be32 *p = xdr->p - 2;
3358
3359 /* Make sure there will be room for padding if needed */
3360 if (xdr->end - xdr->p < 1)
3361 return nfserr_resource;
3362
3363 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3364 read->rd_offset, &maxcount);
3365 if (nfserr) {
3366 /*
3367 * nfsd_splice_actor may have already messed with the
3368 * page length; reset it so as not to confuse
3369 * xdr_truncate_encode:
3370 */
3371 buf->page_len = 0;
3372 return nfserr;
3373 }
3374
3375 eof = (read->rd_offset + maxcount >=
3376 d_inode(read->rd_fhp->fh_dentry)->i_size);
3377
3378 *(p++) = htonl(eof);
3379 *(p++) = htonl(maxcount);
3380
3381 buf->page_len = maxcount;
3382 buf->len += maxcount;
3383 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3384 / PAGE_SIZE;
3385
3386 /* Use rest of head for padding and remaining ops: */
3387 buf->tail[0].iov_base = xdr->p;
3388 buf->tail[0].iov_len = 0;
3389 xdr->iov = buf->tail;
3390 if (maxcount&3) {
3391 int pad = 4 - (maxcount&3);
3392
3393 *(xdr->p++) = 0;
3394
3395 buf->tail[0].iov_base += maxcount&3;
3396 buf->tail[0].iov_len = pad;
3397 buf->len += pad;
3398 }
3399
3400 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3401 buf->buflen - buf->len);
3402 buf->buflen = buf->len + space_left;
3403 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3404
3405 return 0;
3406 }
3407
3408 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3409 struct nfsd4_read *read,
3410 struct file *file, unsigned long maxcount)
3411 {
3412 struct xdr_stream *xdr = &resp->xdr;
3413 u32 eof;
3414 int v;
3415 int starting_len = xdr->buf->len - 8;
3416 long len;
3417 int thislen;
3418 __be32 nfserr;
3419 __be32 tmp;
3420 __be32 *p;
3421 u32 zzz = 0;
3422 int pad;
3423
3424 len = maxcount;
3425 v = 0;
3426
3427 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3428 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3429 WARN_ON_ONCE(!p);
3430 resp->rqstp->rq_vec[v].iov_base = p;
3431 resp->rqstp->rq_vec[v].iov_len = thislen;
3432 v++;
3433 len -= thislen;
3434
3435 while (len) {
3436 thislen = min_t(long, len, PAGE_SIZE);
3437 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3438 WARN_ON_ONCE(!p);
3439 resp->rqstp->rq_vec[v].iov_base = p;
3440 resp->rqstp->rq_vec[v].iov_len = thislen;
3441 v++;
3442 len -= thislen;
3443 }
3444 read->rd_vlen = v;
3445
3446 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3447 read->rd_vlen, &maxcount);
3448 if (nfserr)
3449 return nfserr;
3450 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3451
3452 eof = (read->rd_offset + maxcount >=
3453 d_inode(read->rd_fhp->fh_dentry)->i_size);
3454
3455 tmp = htonl(eof);
3456 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3457 tmp = htonl(maxcount);
3458 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3459
3460 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3461 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3462 &zzz, pad);
3463 return 0;
3464
3465 }
3466
3467 static __be32
3468 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3469 struct nfsd4_read *read)
3470 {
3471 unsigned long maxcount;
3472 struct xdr_stream *xdr = &resp->xdr;
3473 struct file *file = read->rd_filp;
3474 int starting_len = xdr->buf->len;
3475 struct raparms *ra = NULL;
3476 __be32 *p;
3477
3478 if (nfserr)
3479 goto out;
3480
3481 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3482 if (!p) {
3483 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3484 nfserr = nfserr_resource;
3485 goto out;
3486 }
3487 if (resp->xdr.buf->page_len &&
3488 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3489 WARN_ON_ONCE(1);
3490 nfserr = nfserr_resource;
3491 goto out;
3492 }
3493 xdr_commit_encode(xdr);
3494
3495 maxcount = svc_max_payload(resp->rqstp);
3496 maxcount = min_t(unsigned long, maxcount,
3497 (xdr->buf->buflen - xdr->buf->len));
3498 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3499
3500 if (read->rd_tmp_file)
3501 ra = nfsd_init_raparms(file);
3502
3503 if (file->f_op->splice_read &&
3504 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3505 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3506 else
3507 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3508
3509 if (ra)
3510 nfsd_put_raparams(file, ra);
3511
3512 if (nfserr)
3513 xdr_truncate_encode(xdr, starting_len);
3514
3515 out:
3516 if (file)
3517 fput(file);
3518 return nfserr;
3519 }
3520
3521 static __be32
3522 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3523 {
3524 int maxcount;
3525 __be32 wire_count;
3526 int zero = 0;
3527 struct xdr_stream *xdr = &resp->xdr;
3528 int length_offset = xdr->buf->len;
3529 __be32 *p;
3530
3531 if (nfserr)
3532 return nfserr;
3533
3534 p = xdr_reserve_space(xdr, 4);
3535 if (!p)
3536 return nfserr_resource;
3537 maxcount = PAGE_SIZE;
3538
3539 p = xdr_reserve_space(xdr, maxcount);
3540 if (!p)
3541 return nfserr_resource;
3542 /*
3543 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3544 * if they would overflow the buffer. Is this kosher in NFSv4? If
3545 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3546 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3547 */
3548 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3549 (char *)p, &maxcount);
3550 if (nfserr == nfserr_isdir)
3551 nfserr = nfserr_inval;
3552 if (nfserr) {
3553 xdr_truncate_encode(xdr, length_offset);
3554 return nfserr;
3555 }
3556
3557 wire_count = htonl(maxcount);
3558 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3559 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3560 if (maxcount & 3)
3561 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3562 &zero, 4 - (maxcount&3));
3563 return 0;
3564 }
3565
3566 static __be32
3567 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3568 {
3569 int maxcount;
3570 int bytes_left;
3571 loff_t offset;
3572 __be64 wire_offset;
3573 struct xdr_stream *xdr = &resp->xdr;
3574 int starting_len = xdr->buf->len;
3575 __be32 *p;
3576
3577 if (nfserr)
3578 return nfserr;
3579
3580 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3581 if (!p)
3582 return nfserr_resource;
3583
3584 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3585 *p++ = cpu_to_be32(0);
3586 *p++ = cpu_to_be32(0);
3587 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3588 - (char *)resp->xdr.buf->head[0].iov_base;
3589
3590 /*
3591 * Number of bytes left for directory entries allowing for the
3592 * final 8 bytes of the readdir and a following failed op:
3593 */
3594 bytes_left = xdr->buf->buflen - xdr->buf->len
3595 - COMPOUND_ERR_SLACK_SPACE - 8;
3596 if (bytes_left < 0) {
3597 nfserr = nfserr_resource;
3598 goto err_no_verf;
3599 }
3600 maxcount = svc_max_payload(resp->rqstp);
3601 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
3602 /*
3603 * Note the rfc defines rd_maxcount as the size of the
3604 * READDIR4resok structure, which includes the verifier above
3605 * and the 8 bytes encoded at the end of this function:
3606 */
3607 if (maxcount < 16) {
3608 nfserr = nfserr_toosmall;
3609 goto err_no_verf;
3610 }
3611 maxcount = min_t(int, maxcount-16, bytes_left);
3612
3613 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3614 if (!readdir->rd_dircount)
3615 readdir->rd_dircount = svc_max_payload(resp->rqstp);
3616
3617 readdir->xdr = xdr;
3618 readdir->rd_maxcount = maxcount;
3619 readdir->common.err = 0;
3620 readdir->cookie_offset = 0;
3621
3622 offset = readdir->rd_cookie;
3623 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3624 &offset,
3625 &readdir->common, nfsd4_encode_dirent);
3626 if (nfserr == nfs_ok &&
3627 readdir->common.err == nfserr_toosmall &&
3628 xdr->buf->len == starting_len + 8) {
3629 /* nothing encoded; which limit did we hit?: */
3630 if (maxcount - 16 < bytes_left)
3631 /* It was the fault of rd_maxcount: */
3632 nfserr = nfserr_toosmall;
3633 else
3634 /* We ran out of buffer space: */
3635 nfserr = nfserr_resource;
3636 }
3637 if (nfserr)
3638 goto err_no_verf;
3639
3640 if (readdir->cookie_offset) {
3641 wire_offset = cpu_to_be64(offset);
3642 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3643 &wire_offset, 8);
3644 }
3645
3646 p = xdr_reserve_space(xdr, 8);
3647 if (!p) {
3648 WARN_ON_ONCE(1);
3649 goto err_no_verf;
3650 }
3651 *p++ = 0; /* no more entries */
3652 *p++ = htonl(readdir->common.err == nfserr_eof);
3653
3654 return 0;
3655 err_no_verf:
3656 xdr_truncate_encode(xdr, starting_len);
3657 return nfserr;
3658 }
3659
3660 static __be32
3661 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3662 {
3663 struct xdr_stream *xdr = &resp->xdr;
3664 __be32 *p;
3665
3666 if (!nfserr) {
3667 p = xdr_reserve_space(xdr, 20);
3668 if (!p)
3669 return nfserr_resource;
3670 p = encode_cinfo(p, &remove->rm_cinfo);
3671 }
3672 return nfserr;
3673 }
3674
3675 static __be32
3676 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3677 {
3678 struct xdr_stream *xdr = &resp->xdr;
3679 __be32 *p;
3680
3681 if (!nfserr) {
3682 p = xdr_reserve_space(xdr, 40);
3683 if (!p)
3684 return nfserr_resource;
3685 p = encode_cinfo(p, &rename->rn_sinfo);
3686 p = encode_cinfo(p, &rename->rn_tinfo);
3687 }
3688 return nfserr;
3689 }
3690
3691 static __be32
3692 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3693 __be32 nfserr, struct svc_export *exp)
3694 {
3695 u32 i, nflavs, supported;
3696 struct exp_flavor_info *flavs;
3697 struct exp_flavor_info def_flavs[2];
3698 __be32 *p, *flavorsp;
3699 static bool report = true;
3700
3701 if (nfserr)
3702 goto out;
3703 nfserr = nfserr_resource;
3704 if (exp->ex_nflavors) {
3705 flavs = exp->ex_flavors;
3706 nflavs = exp->ex_nflavors;
3707 } else { /* Handling of some defaults in absence of real secinfo: */
3708 flavs = def_flavs;
3709 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3710 nflavs = 2;
3711 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3712 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3713 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3714 nflavs = 1;
3715 flavs[0].pseudoflavor
3716 = svcauth_gss_flavor(exp->ex_client);
3717 } else {
3718 nflavs = 1;
3719 flavs[0].pseudoflavor
3720 = exp->ex_client->flavour->flavour;
3721 }
3722 }
3723
3724 supported = 0;
3725 p = xdr_reserve_space(xdr, 4);
3726 if (!p)
3727 goto out;
3728 flavorsp = p++; /* to be backfilled later */
3729
3730 for (i = 0; i < nflavs; i++) {
3731 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3732 struct rpcsec_gss_info info;
3733
3734 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3735 supported++;
3736 p = xdr_reserve_space(xdr, 4 + 4 +
3737 XDR_LEN(info.oid.len) + 4 + 4);
3738 if (!p)
3739 goto out;
3740 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3741 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3742 *p++ = cpu_to_be32(info.qop);
3743 *p++ = cpu_to_be32(info.service);
3744 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3745 supported++;
3746 p = xdr_reserve_space(xdr, 4);
3747 if (!p)
3748 goto out;
3749 *p++ = cpu_to_be32(pf);
3750 } else {
3751 if (report)
3752 pr_warn("NFS: SECINFO: security flavor %u "
3753 "is not supported\n", pf);
3754 }
3755 }
3756
3757 if (nflavs != supported)
3758 report = false;
3759 *flavorsp = htonl(supported);
3760 nfserr = 0;
3761 out:
3762 if (exp)
3763 exp_put(exp);
3764 return nfserr;
3765 }
3766
3767 static __be32
3768 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3769 struct nfsd4_secinfo *secinfo)
3770 {
3771 struct xdr_stream *xdr = &resp->xdr;
3772
3773 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3774 }
3775
3776 static __be32
3777 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3778 struct nfsd4_secinfo_no_name *secinfo)
3779 {
3780 struct xdr_stream *xdr = &resp->xdr;
3781
3782 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3783 }
3784
3785 /*
3786 * The SETATTR encode routine is special -- it always encodes a bitmap,
3787 * regardless of the error status.
3788 */
3789 static __be32
3790 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3791 {
3792 struct xdr_stream *xdr = &resp->xdr;
3793 __be32 *p;
3794
3795 p = xdr_reserve_space(xdr, 16);
3796 if (!p)
3797 return nfserr_resource;
3798 if (nfserr) {
3799 *p++ = cpu_to_be32(3);
3800 *p++ = cpu_to_be32(0);
3801 *p++ = cpu_to_be32(0);
3802 *p++ = cpu_to_be32(0);
3803 }
3804 else {
3805 *p++ = cpu_to_be32(3);
3806 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3807 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3808 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3809 }
3810 return nfserr;
3811 }
3812
3813 static __be32
3814 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3815 {
3816 struct xdr_stream *xdr = &resp->xdr;
3817 __be32 *p;
3818
3819 if (!nfserr) {
3820 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3821 if (!p)
3822 return nfserr_resource;
3823 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3824 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3825 NFS4_VERIFIER_SIZE);
3826 }
3827 else if (nfserr == nfserr_clid_inuse) {
3828 p = xdr_reserve_space(xdr, 8);
3829 if (!p)
3830 return nfserr_resource;
3831 *p++ = cpu_to_be32(0);
3832 *p++ = cpu_to_be32(0);
3833 }
3834 return nfserr;
3835 }
3836
3837 static __be32
3838 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3839 {
3840 struct xdr_stream *xdr = &resp->xdr;
3841 __be32 *p;
3842
3843 if (!nfserr) {
3844 p = xdr_reserve_space(xdr, 16);
3845 if (!p)
3846 return nfserr_resource;
3847 *p++ = cpu_to_be32(write->wr_bytes_written);
3848 *p++ = cpu_to_be32(write->wr_how_written);
3849 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3850 NFS4_VERIFIER_SIZE);
3851 }
3852 return nfserr;
3853 }
3854
3855 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3856 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3857 1 << (OP_EXCHANGE_ID - 32) |
3858 1 << (OP_CREATE_SESSION - 32) |
3859 1 << (OP_DESTROY_SESSION - 32) |
3860 1 << (OP_DESTROY_CLIENTID - 32)
3861 };
3862
3863 static __be32
3864 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3865 struct nfsd4_exchange_id *exid)
3866 {
3867 struct xdr_stream *xdr = &resp->xdr;
3868 __be32 *p;
3869 char *major_id;
3870 char *server_scope;
3871 int major_id_sz;
3872 int server_scope_sz;
3873 uint64_t minor_id = 0;
3874
3875 if (nfserr)
3876 return nfserr;
3877
3878 major_id = utsname()->nodename;
3879 major_id_sz = strlen(major_id);
3880 server_scope = utsname()->nodename;
3881 server_scope_sz = strlen(server_scope);
3882
3883 p = xdr_reserve_space(xdr,
3884 8 /* eir_clientid */ +
3885 4 /* eir_sequenceid */ +
3886 4 /* eir_flags */ +
3887 4 /* spr_how */);
3888 if (!p)
3889 return nfserr_resource;
3890
3891 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3892 *p++ = cpu_to_be32(exid->seqid);
3893 *p++ = cpu_to_be32(exid->flags);
3894
3895 *p++ = cpu_to_be32(exid->spa_how);
3896
3897 switch (exid->spa_how) {
3898 case SP4_NONE:
3899 break;
3900 case SP4_MACH_CRED:
3901 /* spo_must_enforce, spo_must_allow */
3902 p = xdr_reserve_space(xdr, 16);
3903 if (!p)
3904 return nfserr_resource;
3905
3906 /* spo_must_enforce bitmap: */
3907 *p++ = cpu_to_be32(2);
3908 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3909 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3910 /* empty spo_must_allow bitmap: */
3911 *p++ = cpu_to_be32(0);
3912
3913 break;
3914 default:
3915 WARN_ON_ONCE(1);
3916 }
3917
3918 p = xdr_reserve_space(xdr,
3919 8 /* so_minor_id */ +
3920 4 /* so_major_id.len */ +
3921 (XDR_QUADLEN(major_id_sz) * 4) +
3922 4 /* eir_server_scope.len */ +
3923 (XDR_QUADLEN(server_scope_sz) * 4) +
3924 4 /* eir_server_impl_id.count (0) */);
3925 if (!p)
3926 return nfserr_resource;
3927
3928 /* The server_owner struct */
3929 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3930 /* major id */
3931 p = xdr_encode_opaque(p, major_id, major_id_sz);
3932
3933 /* Server scope */
3934 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3935
3936 /* Implementation id */
3937 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3938 return 0;
3939 }
3940
3941 static __be32
3942 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3943 struct nfsd4_create_session *sess)
3944 {
3945 struct xdr_stream *xdr = &resp->xdr;
3946 __be32 *p;
3947
3948 if (nfserr)
3949 return nfserr;
3950
3951 p = xdr_reserve_space(xdr, 24);
3952 if (!p)
3953 return nfserr_resource;
3954 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3955 NFS4_MAX_SESSIONID_LEN);
3956 *p++ = cpu_to_be32(sess->seqid);
3957 *p++ = cpu_to_be32(sess->flags);
3958
3959 p = xdr_reserve_space(xdr, 28);
3960 if (!p)
3961 return nfserr_resource;
3962 *p++ = cpu_to_be32(0); /* headerpadsz */
3963 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3964 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3965 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3966 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3967 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3968 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3969
3970 if (sess->fore_channel.nr_rdma_attrs) {
3971 p = xdr_reserve_space(xdr, 4);
3972 if (!p)
3973 return nfserr_resource;
3974 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3975 }
3976
3977 p = xdr_reserve_space(xdr, 28);
3978 if (!p)
3979 return nfserr_resource;
3980 *p++ = cpu_to_be32(0); /* headerpadsz */
3981 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3982 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3983 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3984 *p++ = cpu_to_be32(sess->back_channel.maxops);
3985 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3986 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3987
3988 if (sess->back_channel.nr_rdma_attrs) {
3989 p = xdr_reserve_space(xdr, 4);
3990 if (!p)
3991 return nfserr_resource;
3992 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3993 }
3994 return 0;
3995 }
3996
3997 static __be32
3998 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3999 struct nfsd4_sequence *seq)
4000 {
4001 struct xdr_stream *xdr = &resp->xdr;
4002 __be32 *p;
4003
4004 if (nfserr)
4005 return nfserr;
4006
4007 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4008 if (!p)
4009 return nfserr_resource;
4010 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4011 NFS4_MAX_SESSIONID_LEN);
4012 *p++ = cpu_to_be32(seq->seqid);
4013 *p++ = cpu_to_be32(seq->slotid);
4014 /* Note slotid's are numbered from zero: */
4015 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4016 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4017 *p++ = cpu_to_be32(seq->status_flags);
4018
4019 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4020 return 0;
4021 }
4022
4023 static __be32
4024 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4025 struct nfsd4_test_stateid *test_stateid)
4026 {
4027 struct xdr_stream *xdr = &resp->xdr;
4028 struct nfsd4_test_stateid_id *stateid, *next;
4029 __be32 *p;
4030
4031 if (nfserr)
4032 return nfserr;
4033
4034 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4035 if (!p)
4036 return nfserr_resource;
4037 *p++ = htonl(test_stateid->ts_num_ids);
4038
4039 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4040 *p++ = stateid->ts_id_status;
4041 }
4042
4043 return nfserr;
4044 }
4045
4046 #ifdef CONFIG_NFSD_PNFS
4047 static __be32
4048 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4049 struct nfsd4_getdeviceinfo *gdev)
4050 {
4051 struct xdr_stream *xdr = &resp->xdr;
4052 const struct nfsd4_layout_ops *ops;
4053 u32 starting_len = xdr->buf->len, needed_len;
4054 __be32 *p;
4055
4056 dprintk("%s: err %d\n", __func__, nfserr);
4057 if (nfserr)
4058 goto out;
4059
4060 nfserr = nfserr_resource;
4061 p = xdr_reserve_space(xdr, 4);
4062 if (!p)
4063 goto out;
4064
4065 *p++ = cpu_to_be32(gdev->gd_layout_type);
4066
4067 /* If maxcount is 0 then just update notifications */
4068 if (gdev->gd_maxcount != 0) {
4069 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4070 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4071 if (nfserr) {
4072 /*
4073 * We don't bother to burden the layout drivers with
4074 * enforcing gd_maxcount, just tell the client to
4075 * come back with a bigger buffer if it's not enough.
4076 */
4077 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4078 goto toosmall;
4079 goto out;
4080 }
4081 }
4082
4083 nfserr = nfserr_resource;
4084 if (gdev->gd_notify_types) {
4085 p = xdr_reserve_space(xdr, 4 + 4);
4086 if (!p)
4087 goto out;
4088 *p++ = cpu_to_be32(1); /* bitmap length */
4089 *p++ = cpu_to_be32(gdev->gd_notify_types);
4090 } else {
4091 p = xdr_reserve_space(xdr, 4);
4092 if (!p)
4093 goto out;
4094 *p++ = 0;
4095 }
4096
4097 nfserr = 0;
4098 out:
4099 kfree(gdev->gd_device);
4100 dprintk("%s: done: %d\n", __func__, be32_to_cpu(nfserr));
4101 return nfserr;
4102
4103 toosmall:
4104 dprintk("%s: maxcount too small\n", __func__);
4105 needed_len = xdr->buf->len + 4 /* notifications */;
4106 xdr_truncate_encode(xdr, starting_len);
4107 p = xdr_reserve_space(xdr, 4);
4108 if (!p) {
4109 nfserr = nfserr_resource;
4110 } else {
4111 *p++ = cpu_to_be32(needed_len);
4112 nfserr = nfserr_toosmall;
4113 }
4114 goto out;
4115 }
4116
4117 static __be32
4118 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4119 struct nfsd4_layoutget *lgp)
4120 {
4121 struct xdr_stream *xdr = &resp->xdr;
4122 const struct nfsd4_layout_ops *ops;
4123 __be32 *p;
4124
4125 dprintk("%s: err %d\n", __func__, nfserr);
4126 if (nfserr)
4127 goto out;
4128
4129 nfserr = nfserr_resource;
4130 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4131 if (!p)
4132 goto out;
4133
4134 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4135 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4136 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4137 sizeof(stateid_opaque_t));
4138
4139 *p++ = cpu_to_be32(1); /* we always return a single layout */
4140 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4141 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4142 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4143 *p++ = cpu_to_be32(lgp->lg_layout_type);
4144
4145 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4146 nfserr = ops->encode_layoutget(xdr, lgp);
4147 out:
4148 kfree(lgp->lg_content);
4149 return nfserr;
4150 }
4151
4152 static __be32
4153 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4154 struct nfsd4_layoutcommit *lcp)
4155 {
4156 struct xdr_stream *xdr = &resp->xdr;
4157 __be32 *p;
4158
4159 if (nfserr)
4160 return nfserr;
4161
4162 p = xdr_reserve_space(xdr, 4);
4163 if (!p)
4164 return nfserr_resource;
4165 *p++ = cpu_to_be32(lcp->lc_size_chg);
4166 if (lcp->lc_size_chg) {
4167 p = xdr_reserve_space(xdr, 8);
4168 if (!p)
4169 return nfserr_resource;
4170 p = xdr_encode_hyper(p, lcp->lc_newsize);
4171 }
4172
4173 return nfs_ok;
4174 }
4175
4176 static __be32
4177 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4178 struct nfsd4_layoutreturn *lrp)
4179 {
4180 struct xdr_stream *xdr = &resp->xdr;
4181 __be32 *p;
4182
4183 if (nfserr)
4184 return nfserr;
4185
4186 p = xdr_reserve_space(xdr, 4);
4187 if (!p)
4188 return nfserr_resource;
4189 *p++ = cpu_to_be32(lrp->lrs_present);
4190 if (lrp->lrs_present)
4191 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4192 return nfs_ok;
4193 }
4194 #endif /* CONFIG_NFSD_PNFS */
4195
4196 static __be32
4197 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4198 struct nfsd4_seek *seek)
4199 {
4200 __be32 *p;
4201
4202 if (nfserr)
4203 return nfserr;
4204
4205 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4206 *p++ = cpu_to_be32(seek->seek_eof);
4207 p = xdr_encode_hyper(p, seek->seek_pos);
4208
4209 return nfserr;
4210 }
4211
4212 static __be32
4213 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4214 {
4215 return nfserr;
4216 }
4217
4218 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4219
4220 /*
4221 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4222 * since we don't need to filter out obsolete ops as this is
4223 * done in the decoding phase.
4224 */
4225 static nfsd4_enc nfsd4_enc_ops[] = {
4226 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4227 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4228 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4229 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4230 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4231 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4232 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4233 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4234 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4235 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4236 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4237 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4238 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4239 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4240 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4241 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4242 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4243 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4244 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4245 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4246 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4247 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4248 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4249 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4250 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4251 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4252 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4253 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4254 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4256 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4257 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4258 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4259 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4260 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4261 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4262 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4263
4264 /* NFSv4.1 operations */
4265 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4266 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4267 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4268 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4269 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4272 #ifdef CONFIG_NFSD_PNFS
4273 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4274 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4275 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4276 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4277 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4278 #else
4279 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4280 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4281 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4282 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4283 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4284 #endif
4285 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4286 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4287 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4288 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4289 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4290 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4291 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4292
4293 /* NFSv4.2 operations */
4294 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4295 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
4296 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4297 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4299 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4300 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4301 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4302 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4304 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4305 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4306 };
4307
4308 /*
4309 * Calculate whether we still have space to encode repsize bytes.
4310 * There are two considerations:
4311 * - For NFS versions >=4.1, the size of the reply must stay within
4312 * session limits
4313 * - For all NFS versions, we must stay within limited preallocated
4314 * buffer space.
4315 *
4316 * This is called before the operation is processed, so can only provide
4317 * an upper estimate. For some nonidempotent operations (such as
4318 * getattr), it's not necessarily a problem if that estimate is wrong,
4319 * as we can fail it after processing without significant side effects.
4320 */
4321 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4322 {
4323 struct xdr_buf *buf = &resp->rqstp->rq_res;
4324 struct nfsd4_slot *slot = resp->cstate.slot;
4325
4326 if (buf->len + respsize <= buf->buflen)
4327 return nfs_ok;
4328 if (!nfsd4_has_session(&resp->cstate))
4329 return nfserr_resource;
4330 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4331 WARN_ON_ONCE(1);
4332 return nfserr_rep_too_big_to_cache;
4333 }
4334 return nfserr_rep_too_big;
4335 }
4336
4337 void
4338 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4339 {
4340 struct xdr_stream *xdr = &resp->xdr;
4341 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4342 struct svc_rqst *rqstp = resp->rqstp;
4343 int post_err_offset;
4344 nfsd4_enc encoder;
4345 __be32 *p;
4346
4347 p = xdr_reserve_space(xdr, 8);
4348 if (!p) {
4349 WARN_ON_ONCE(1);
4350 return;
4351 }
4352 *p++ = cpu_to_be32(op->opnum);
4353 post_err_offset = xdr->buf->len;
4354
4355 if (op->opnum == OP_ILLEGAL)
4356 goto status;
4357 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4358 !nfsd4_enc_ops[op->opnum]);
4359 encoder = nfsd4_enc_ops[op->opnum];
4360 op->status = encoder(resp, op->status, &op->u);
4361 xdr_commit_encode(xdr);
4362
4363 /* nfsd4_check_resp_size guarantees enough room for error status */
4364 if (!op->status) {
4365 int space_needed = 0;
4366 if (!nfsd4_last_compound_op(rqstp))
4367 space_needed = COMPOUND_ERR_SLACK_SPACE;
4368 op->status = nfsd4_check_resp_size(resp, space_needed);
4369 }
4370 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4371 struct nfsd4_slot *slot = resp->cstate.slot;
4372
4373 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4374 op->status = nfserr_rep_too_big_to_cache;
4375 else
4376 op->status = nfserr_rep_too_big;
4377 }
4378 if (op->status == nfserr_resource ||
4379 op->status == nfserr_rep_too_big ||
4380 op->status == nfserr_rep_too_big_to_cache) {
4381 /*
4382 * The operation may have already been encoded or
4383 * partially encoded. No op returns anything additional
4384 * in the case of one of these three errors, so we can
4385 * just truncate back to after the status. But it's a
4386 * bug if we had to do this on a non-idempotent op:
4387 */
4388 warn_on_nonidempotent_op(op);
4389 xdr_truncate_encode(xdr, post_err_offset);
4390 }
4391 if (so) {
4392 int len = xdr->buf->len - post_err_offset;
4393
4394 so->so_replay.rp_status = op->status;
4395 so->so_replay.rp_buflen = len;
4396 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4397 so->so_replay.rp_buf, len);
4398 }
4399 status:
4400 /* Note that op->status is already in network byte order: */
4401 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4402 }
4403
4404 /*
4405 * Encode the reply stored in the stateowner reply cache
4406 *
4407 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4408 * previously sent already encoded operation.
4409 */
4410 void
4411 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4412 {
4413 __be32 *p;
4414 struct nfs4_replay *rp = op->replay;
4415
4416 BUG_ON(!rp);
4417
4418 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4419 if (!p) {
4420 WARN_ON_ONCE(1);
4421 return;
4422 }
4423 *p++ = cpu_to_be32(op->opnum);
4424 *p++ = rp->rp_status; /* already xdr'ed */
4425
4426 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4427 }
4428
4429 int
4430 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4431 {
4432 return xdr_ressize_check(rqstp, p);
4433 }
4434
4435 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4436 {
4437 struct svc_rqst *rqstp = rq;
4438 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4439
4440 if (args->ops != args->iops) {
4441 kfree(args->ops);
4442 args->ops = args->iops;
4443 }
4444 kfree(args->tmpp);
4445 args->tmpp = NULL;
4446 while (args->to_free) {
4447 struct svcxdr_tmpbuf *tb = args->to_free;
4448 args->to_free = tb->next;
4449 kfree(tb);
4450 }
4451 return 1;
4452 }
4453
4454 int
4455 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4456 {
4457 if (rqstp->rq_arg.head[0].iov_len % 4) {
4458 /* client is nuts */
4459 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4460 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4461 return 0;
4462 }
4463 args->p = p;
4464 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4465 args->pagelist = rqstp->rq_arg.pages;
4466 args->pagelen = rqstp->rq_arg.page_len;
4467 args->tmpp = NULL;
4468 args->to_free = NULL;
4469 args->ops = args->iops;
4470 args->rqstp = rqstp;
4471
4472 return !nfsd4_decode_compound(args);
4473 }
4474
4475 int
4476 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4477 {
4478 /*
4479 * All that remains is to write the tag and operation count...
4480 */
4481 struct xdr_buf *buf = resp->xdr.buf;
4482
4483 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4484 buf->tail[0].iov_len);
4485
4486 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4487
4488 p = resp->tagp;
4489 *p++ = htonl(resp->taglen);
4490 memcpy(p, resp->tag, resp->taglen);
4491 p += XDR_QUADLEN(resp->taglen);
4492 *p++ = htonl(resp->opcnt);
4493
4494 nfsd4_sequence_done(resp);
4495 return 1;
4496 }
4497
4498 /*
4499 * Local variables:
4500 * c-basic-offset: 8
4501 * End:
4502 */
Linux with added FPC-III support