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Bluetooth: vhci: Fix race at creating hci device
[linux/fpc-iii.git] / fs / nfsd / nfs4xdr.c
blobdc7fd83409da9e8c87828e684028523a733eb39c
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/slab.h>
37 #include <linux/namei.h>
38 #include <linux/statfs.h>
39 #include <linux/utsname.h>
40 #include <linux/pagemap.h>
41 #include <linux/sunrpc/svcauth_gss.h>
42
43 #include "idmap.h"
44 #include "acl.h"
45 #include "xdr4.h"
46 #include "vfs.h"
47 #include "state.h"
48 #include "cache.h"
49 #include "netns.h"
50
51 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
52 #include <linux/security.h>
53 #endif
54
55
56 #define NFSDDBG_FACILITY NFSDDBG_XDR
57
58 /*
59 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
60 * directory in order to indicate to the client that a filesystem boundary is present
61 * We use a fixed fsid for a referral
62 */
63 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
64 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
65
66 static __be32
67 check_filename(char *str, int len)
68 {
69 int i;
70
71 if (len == 0)
72 return nfserr_inval;
73 if (isdotent(str, len))
74 return nfserr_badname;
75 for (i = 0; i < len; i++)
76 if (str[i] == '/')
77 return nfserr_badname;
78 return 0;
79 }
80
81 #define DECODE_HEAD \
82 __be32 *p; \
83 __be32 status
84 #define DECODE_TAIL \
85 status = 0; \
86 out: \
87 return status; \
88 xdr_error: \
89 dprintk("NFSD: xdr error (%s:%d)\n", \
90 __FILE__, __LINE__); \
91 status = nfserr_bad_xdr; \
92 goto out
93
94 #define READMEM(x,nbytes) do { \
95 x = (char *)p; \
96 p += XDR_QUADLEN(nbytes); \
97 } while (0)
98 #define SAVEMEM(x,nbytes) do { \
99 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
100 savemem(argp, p, nbytes) : \
101 (char *)p)) { \
102 dprintk("NFSD: xdr error (%s:%d)\n", \
103 __FILE__, __LINE__); \
104 goto xdr_error; \
105 } \
106 p += XDR_QUADLEN(nbytes); \
107 } while (0)
108 #define COPYMEM(x,nbytes) do { \
109 memcpy((x), p, nbytes); \
110 p += XDR_QUADLEN(nbytes); \
111 } while (0)
112
113 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
114 #define READ_BUF(nbytes) do { \
115 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
116 p = argp->p; \
117 argp->p += XDR_QUADLEN(nbytes); \
118 } else if (!(p = read_buf(argp, nbytes))) { \
119 dprintk("NFSD: xdr error (%s:%d)\n", \
120 __FILE__, __LINE__); \
121 goto xdr_error; \
122 } \
123 } while (0)
124
125 static void next_decode_page(struct nfsd4_compoundargs *argp)
126 {
127 argp->p = page_address(argp->pagelist[0]);
128 argp->pagelist++;
129 if (argp->pagelen < PAGE_SIZE) {
130 argp->end = argp->p + (argp->pagelen>>2);
131 argp->pagelen = 0;
132 } else {
133 argp->end = argp->p + (PAGE_SIZE>>2);
134 argp->pagelen -= PAGE_SIZE;
135 }
136 }
137
138 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
139 {
140 /* We want more bytes than seem to be available.
141 * Maybe we need a new page, maybe we have just run out
142 */
143 unsigned int avail = (char *)argp->end - (char *)argp->p;
144 __be32 *p;
145 if (avail + argp->pagelen < nbytes)
146 return NULL;
147 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
148 return NULL;
149 /* ok, we can do it with the current plus the next page */
150 if (nbytes <= sizeof(argp->tmp))
151 p = argp->tmp;
152 else {
153 kfree(argp->tmpp);
154 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
155 if (!p)
156 return NULL;
157
158 }
159 /*
160 * The following memcpy is safe because read_buf is always
161 * called with nbytes > avail, and the two cases above both
162 * guarantee p points to at least nbytes bytes.
163 */
164 memcpy(p, argp->p, avail);
165 next_decode_page(argp);
166 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
167 argp->p += XDR_QUADLEN(nbytes - avail);
168 return p;
169 }
170
171 static int zero_clientid(clientid_t *clid)
172 {
173 return (clid->cl_boot == 0) && (clid->cl_id == 0);
174 }
175
176 /**
177 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
178 * @argp: NFSv4 compound argument structure
179 * @p: pointer to be freed (with kfree())
180 *
181 * Marks @p to be freed when processing the compound operation
182 * described in @argp finishes.
183 */
184 static void *
185 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
186 {
187 struct svcxdr_tmpbuf *tb;
188
189 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
190 if (!tb)
191 return NULL;
192 tb->next = argp->to_free;
193 argp->to_free = tb;
194 return tb->buf;
195 }
196
197 /*
198 * For xdr strings that need to be passed to other kernel api's
199 * as null-terminated strings.
200 *
201 * Note null-terminating in place usually isn't safe since the
202 * buffer might end on a page boundary.
203 */
204 static char *
205 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
206 {
207 char *p = svcxdr_tmpalloc(argp, len + 1);
208
209 if (!p)
210 return NULL;
211 memcpy(p, buf, len);
212 p[len] = '\0';
213 return p;
214 }
215
216 /**
217 * savemem - duplicate a chunk of memory for later processing
218 * @argp: NFSv4 compound argument structure to be freed with
219 * @p: pointer to be duplicated
220 * @nbytes: length to be duplicated
221 *
222 * Returns a pointer to a copy of @nbytes bytes of memory at @p
223 * that are preserved until processing of the NFSv4 compound
224 * operation described by @argp finishes.
225 */
226 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
227 {
228 void *ret;
229
230 ret = svcxdr_tmpalloc(argp, nbytes);
231 if (!ret)
232 return NULL;
233 memcpy(ret, p, nbytes);
234 return ret;
235 }
236
237 static __be32
238 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
239 {
240 u32 bmlen;
241 DECODE_HEAD;
242
243 bmval[0] = 0;
244 bmval[1] = 0;
245 bmval[2] = 0;
246
247 READ_BUF(4);
248 bmlen = be32_to_cpup(p++);
249 if (bmlen > 1000)
250 goto xdr_error;
251
252 READ_BUF(bmlen << 2);
253 if (bmlen > 0)
254 bmval[0] = be32_to_cpup(p++);
255 if (bmlen > 1)
256 bmval[1] = be32_to_cpup(p++);
257 if (bmlen > 2)
258 bmval[2] = be32_to_cpup(p++);
259
260 DECODE_TAIL;
261 }
262
263 static __be32
264 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
265 struct iattr *iattr, struct nfs4_acl **acl,
266 struct xdr_netobj *label)
267 {
268 int expected_len, len = 0;
269 u32 dummy32;
270 u64 sec;
271 char *buf;
272
273 DECODE_HEAD;
274 iattr->ia_valid = 0;
275 if ((status = nfsd4_decode_bitmap(argp, bmval)))
276 return status;
277
278 READ_BUF(4);
279 expected_len = be32_to_cpup(p++);
280
281 if (bmval[0] & FATTR4_WORD0_SIZE) {
282 READ_BUF(8);
283 len += 8;
284 p = xdr_decode_hyper(p, &iattr->ia_size);
285 iattr->ia_valid |= ATTR_SIZE;
286 }
287 if (bmval[0] & FATTR4_WORD0_ACL) {
288 u32 nace;
289 struct nfs4_ace *ace;
290
291 READ_BUF(4); len += 4;
292 nace = be32_to_cpup(p++);
293
294 if (nace > NFS4_ACL_MAX)
295 return nfserr_fbig;
296
297 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
298 if (*acl == NULL)
299 return nfserr_jukebox;
300
301 (*acl)->naces = nace;
302 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
303 READ_BUF(16); len += 16;
304 ace->type = be32_to_cpup(p++);
305 ace->flag = be32_to_cpup(p++);
306 ace->access_mask = be32_to_cpup(p++);
307 dummy32 = be32_to_cpup(p++);
308 READ_BUF(dummy32);
309 len += XDR_QUADLEN(dummy32) << 2;
310 READMEM(buf, dummy32);
311 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
312 status = nfs_ok;
313 if (ace->whotype != NFS4_ACL_WHO_NAMED)
314 ;
315 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
316 status = nfsd_map_name_to_gid(argp->rqstp,
317 buf, dummy32, &ace->who_gid);
318 else
319 status = nfsd_map_name_to_uid(argp->rqstp,
320 buf, dummy32, &ace->who_uid);
321 if (status)
322 return status;
323 }
324 } else
325 *acl = NULL;
326 if (bmval[1] & FATTR4_WORD1_MODE) {
327 READ_BUF(4);
328 len += 4;
329 iattr->ia_mode = be32_to_cpup(p++);
330 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
331 iattr->ia_valid |= ATTR_MODE;
332 }
333 if (bmval[1] & FATTR4_WORD1_OWNER) {
334 READ_BUF(4);
335 len += 4;
336 dummy32 = be32_to_cpup(p++);
337 READ_BUF(dummy32);
338 len += (XDR_QUADLEN(dummy32) << 2);
339 READMEM(buf, dummy32);
340 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
341 return status;
342 iattr->ia_valid |= ATTR_UID;
343 }
344 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
345 READ_BUF(4);
346 len += 4;
347 dummy32 = be32_to_cpup(p++);
348 READ_BUF(dummy32);
349 len += (XDR_QUADLEN(dummy32) << 2);
350 READMEM(buf, dummy32);
351 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
352 return status;
353 iattr->ia_valid |= ATTR_GID;
354 }
355 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
356 READ_BUF(4);
357 len += 4;
358 dummy32 = be32_to_cpup(p++);
359 switch (dummy32) {
360 case NFS4_SET_TO_CLIENT_TIME:
361 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
362 all 32 bits of 'nseconds'. */
363 READ_BUF(12);
364 len += 12;
365 p = xdr_decode_hyper(p, &sec);
366 iattr->ia_atime.tv_sec = (time_t)sec;
367 iattr->ia_atime.tv_nsec = be32_to_cpup(p++);
368 if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
369 return nfserr_inval;
370 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
371 break;
372 case NFS4_SET_TO_SERVER_TIME:
373 iattr->ia_valid |= ATTR_ATIME;
374 break;
375 default:
376 goto xdr_error;
377 }
378 }
379 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
380 READ_BUF(4);
381 len += 4;
382 dummy32 = be32_to_cpup(p++);
383 switch (dummy32) {
384 case NFS4_SET_TO_CLIENT_TIME:
385 /* We require the high 32 bits of 'seconds' to be 0, and we ignore
386 all 32 bits of 'nseconds'. */
387 READ_BUF(12);
388 len += 12;
389 p = xdr_decode_hyper(p, &sec);
390 iattr->ia_mtime.tv_sec = sec;
391 iattr->ia_mtime.tv_nsec = be32_to_cpup(p++);
392 if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
393 return nfserr_inval;
394 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
395 break;
396 case NFS4_SET_TO_SERVER_TIME:
397 iattr->ia_valid |= ATTR_MTIME;
398 break;
399 default:
400 goto xdr_error;
401 }
402 }
403
404 label->len = 0;
405 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
406 if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
407 READ_BUF(4);
408 len += 4;
409 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
410 READ_BUF(4);
411 len += 4;
412 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
413 READ_BUF(4);
414 len += 4;
415 dummy32 = be32_to_cpup(p++);
416 READ_BUF(dummy32);
417 if (dummy32 > NFSD4_MAX_SEC_LABEL_LEN)
418 return nfserr_badlabel;
419 len += (XDR_QUADLEN(dummy32) << 2);
420 READMEM(buf, dummy32);
421 label->len = dummy32;
422 label->data = svcxdr_dupstr(argp, buf, dummy32);
423 if (!label->data)
424 return nfserr_jukebox;
425 }
426 #endif
427
428 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
429 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
430 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
431 READ_BUF(expected_len - len);
432 else if (len != expected_len)
433 goto xdr_error;
434
435 DECODE_TAIL;
436 }
437
438 static __be32
439 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
440 {
441 DECODE_HEAD;
442
443 READ_BUF(sizeof(stateid_t));
444 sid->si_generation = be32_to_cpup(p++);
445 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
446
447 DECODE_TAIL;
448 }
449
450 static __be32
451 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
452 {
453 DECODE_HEAD;
454
455 READ_BUF(4);
456 access->ac_req_access = be32_to_cpup(p++);
457
458 DECODE_TAIL;
459 }
460
461 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
462 {
463 DECODE_HEAD;
464 u32 dummy, uid, gid;
465 char *machine_name;
466 int i;
467 int nr_secflavs;
468
469 /* callback_sec_params4 */
470 READ_BUF(4);
471 nr_secflavs = be32_to_cpup(p++);
472 if (nr_secflavs)
473 cbs->flavor = (u32)(-1);
474 else
475 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
476 cbs->flavor = 0;
477 for (i = 0; i < nr_secflavs; ++i) {
478 READ_BUF(4);
479 dummy = be32_to_cpup(p++);
480 switch (dummy) {
481 case RPC_AUTH_NULL:
482 /* Nothing to read */
483 if (cbs->flavor == (u32)(-1))
484 cbs->flavor = RPC_AUTH_NULL;
485 break;
486 case RPC_AUTH_UNIX:
487 READ_BUF(8);
488 /* stamp */
489 dummy = be32_to_cpup(p++);
490
491 /* machine name */
492 dummy = be32_to_cpup(p++);
493 READ_BUF(dummy);
494 SAVEMEM(machine_name, dummy);
495
496 /* uid, gid */
497 READ_BUF(8);
498 uid = be32_to_cpup(p++);
499 gid = be32_to_cpup(p++);
500
501 /* more gids */
502 READ_BUF(4);
503 dummy = be32_to_cpup(p++);
504 READ_BUF(dummy * 4);
505 if (cbs->flavor == (u32)(-1)) {
506 kuid_t kuid = make_kuid(&init_user_ns, uid);
507 kgid_t kgid = make_kgid(&init_user_ns, gid);
508 if (uid_valid(kuid) && gid_valid(kgid)) {
509 cbs->uid = kuid;
510 cbs->gid = kgid;
511 cbs->flavor = RPC_AUTH_UNIX;
512 } else {
513 dprintk("RPC_AUTH_UNIX with invalid"
514 "uid or gid ignoring!\n");
515 }
516 }
517 break;
518 case RPC_AUTH_GSS:
519 dprintk("RPC_AUTH_GSS callback secflavor "
520 "not supported!\n");
521 READ_BUF(8);
522 /* gcbp_service */
523 dummy = be32_to_cpup(p++);
524 /* gcbp_handle_from_server */
525 dummy = be32_to_cpup(p++);
526 READ_BUF(dummy);
527 p += XDR_QUADLEN(dummy);
528 /* gcbp_handle_from_client */
529 READ_BUF(4);
530 dummy = be32_to_cpup(p++);
531 READ_BUF(dummy);
532 break;
533 default:
534 dprintk("Illegal callback secflavor\n");
535 return nfserr_inval;
536 }
537 }
538 DECODE_TAIL;
539 }
540
541 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
542 {
543 DECODE_HEAD;
544
545 READ_BUF(4);
546 bc->bc_cb_program = be32_to_cpup(p++);
547 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
548
549 DECODE_TAIL;
550 }
551
552 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
553 {
554 DECODE_HEAD;
555
556 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
557 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
558 bcts->dir = be32_to_cpup(p++);
559 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
560 * could help us figure out we should be using it. */
561 DECODE_TAIL;
562 }
563
564 static __be32
565 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
566 {
567 DECODE_HEAD;
568
569 READ_BUF(4);
570 close->cl_seqid = be32_to_cpup(p++);
571 return nfsd4_decode_stateid(argp, &close->cl_stateid);
572
573 DECODE_TAIL;
574 }
575
576
577 static __be32
578 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
579 {
580 DECODE_HEAD;
581
582 READ_BUF(12);
583 p = xdr_decode_hyper(p, &commit->co_offset);
584 commit->co_count = be32_to_cpup(p++);
585
586 DECODE_TAIL;
587 }
588
589 static __be32
590 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
591 {
592 DECODE_HEAD;
593
594 READ_BUF(4);
595 create->cr_type = be32_to_cpup(p++);
596 switch (create->cr_type) {
597 case NF4LNK:
598 READ_BUF(4);
599 create->cr_datalen = be32_to_cpup(p++);
600 READ_BUF(create->cr_datalen);
601 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
602 if (!create->cr_data)
603 return nfserr_jukebox;
604 break;
605 case NF4BLK:
606 case NF4CHR:
607 READ_BUF(8);
608 create->cr_specdata1 = be32_to_cpup(p++);
609 create->cr_specdata2 = be32_to_cpup(p++);
610 break;
611 case NF4SOCK:
612 case NF4FIFO:
613 case NF4DIR:
614 default:
615 break;
616 }
617
618 READ_BUF(4);
619 create->cr_namelen = be32_to_cpup(p++);
620 READ_BUF(create->cr_namelen);
621 SAVEMEM(create->cr_name, create->cr_namelen);
622 if ((status = check_filename(create->cr_name, create->cr_namelen)))
623 return status;
624
625 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
626 &create->cr_acl, &create->cr_label);
627 if (status)
628 goto out;
629
630 DECODE_TAIL;
631 }
632
633 static inline __be32
634 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
635 {
636 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
637 }
638
639 static inline __be32
640 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
641 {
642 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
643 }
644
645 static __be32
646 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
647 {
648 DECODE_HEAD;
649
650 READ_BUF(4);
651 link->li_namelen = be32_to_cpup(p++);
652 READ_BUF(link->li_namelen);
653 SAVEMEM(link->li_name, link->li_namelen);
654 if ((status = check_filename(link->li_name, link->li_namelen)))
655 return status;
656
657 DECODE_TAIL;
658 }
659
660 static __be32
661 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
662 {
663 DECODE_HEAD;
664
665 /*
666 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
667 */
668 READ_BUF(28);
669 lock->lk_type = be32_to_cpup(p++);
670 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
671 goto xdr_error;
672 lock->lk_reclaim = be32_to_cpup(p++);
673 p = xdr_decode_hyper(p, &lock->lk_offset);
674 p = xdr_decode_hyper(p, &lock->lk_length);
675 lock->lk_is_new = be32_to_cpup(p++);
676
677 if (lock->lk_is_new) {
678 READ_BUF(4);
679 lock->lk_new_open_seqid = be32_to_cpup(p++);
680 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
681 if (status)
682 return status;
683 READ_BUF(8 + sizeof(clientid_t));
684 lock->lk_new_lock_seqid = be32_to_cpup(p++);
685 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
686 lock->lk_new_owner.len = be32_to_cpup(p++);
687 READ_BUF(lock->lk_new_owner.len);
688 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
689 } else {
690 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
691 if (status)
692 return status;
693 READ_BUF(4);
694 lock->lk_old_lock_seqid = be32_to_cpup(p++);
695 }
696
697 DECODE_TAIL;
698 }
699
700 static __be32
701 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
702 {
703 DECODE_HEAD;
704
705 READ_BUF(32);
706 lockt->lt_type = be32_to_cpup(p++);
707 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
708 goto xdr_error;
709 p = xdr_decode_hyper(p, &lockt->lt_offset);
710 p = xdr_decode_hyper(p, &lockt->lt_length);
711 COPYMEM(&lockt->lt_clientid, 8);
712 lockt->lt_owner.len = be32_to_cpup(p++);
713 READ_BUF(lockt->lt_owner.len);
714 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
715
716 DECODE_TAIL;
717 }
718
719 static __be32
720 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
721 {
722 DECODE_HEAD;
723
724 READ_BUF(8);
725 locku->lu_type = be32_to_cpup(p++);
726 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
727 goto xdr_error;
728 locku->lu_seqid = be32_to_cpup(p++);
729 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
730 if (status)
731 return status;
732 READ_BUF(16);
733 p = xdr_decode_hyper(p, &locku->lu_offset);
734 p = xdr_decode_hyper(p, &locku->lu_length);
735
736 DECODE_TAIL;
737 }
738
739 static __be32
740 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
741 {
742 DECODE_HEAD;
743
744 READ_BUF(4);
745 lookup->lo_len = be32_to_cpup(p++);
746 READ_BUF(lookup->lo_len);
747 SAVEMEM(lookup->lo_name, lookup->lo_len);
748 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
749 return status;
750
751 DECODE_TAIL;
752 }
753
754 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
755 {
756 __be32 *p;
757 u32 w;
758
759 READ_BUF(4);
760 w = be32_to_cpup(p++);
761 *share_access = w & NFS4_SHARE_ACCESS_MASK;
762 *deleg_want = w & NFS4_SHARE_WANT_MASK;
763 if (deleg_when)
764 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
765
766 switch (w & NFS4_SHARE_ACCESS_MASK) {
767 case NFS4_SHARE_ACCESS_READ:
768 case NFS4_SHARE_ACCESS_WRITE:
769 case NFS4_SHARE_ACCESS_BOTH:
770 break;
771 default:
772 return nfserr_bad_xdr;
773 }
774 w &= ~NFS4_SHARE_ACCESS_MASK;
775 if (!w)
776 return nfs_ok;
777 if (!argp->minorversion)
778 return nfserr_bad_xdr;
779 switch (w & NFS4_SHARE_WANT_MASK) {
780 case NFS4_SHARE_WANT_NO_PREFERENCE:
781 case NFS4_SHARE_WANT_READ_DELEG:
782 case NFS4_SHARE_WANT_WRITE_DELEG:
783 case NFS4_SHARE_WANT_ANY_DELEG:
784 case NFS4_SHARE_WANT_NO_DELEG:
785 case NFS4_SHARE_WANT_CANCEL:
786 break;
787 default:
788 return nfserr_bad_xdr;
789 }
790 w &= ~NFS4_SHARE_WANT_MASK;
791 if (!w)
792 return nfs_ok;
793
794 if (!deleg_when) /* open_downgrade */
795 return nfserr_inval;
796 switch (w) {
797 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
798 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
799 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
800 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
801 return nfs_ok;
802 }
803 xdr_error:
804 return nfserr_bad_xdr;
805 }
806
807 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
808 {
809 __be32 *p;
810
811 READ_BUF(4);
812 *x = be32_to_cpup(p++);
813 /* Note: unlinke access bits, deny bits may be zero. */
814 if (*x & ~NFS4_SHARE_DENY_BOTH)
815 return nfserr_bad_xdr;
816 return nfs_ok;
817 xdr_error:
818 return nfserr_bad_xdr;
819 }
820
821 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
822 {
823 __be32 *p;
824
825 READ_BUF(4);
826 o->len = be32_to_cpup(p++);
827
828 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
829 return nfserr_bad_xdr;
830
831 READ_BUF(o->len);
832 SAVEMEM(o->data, o->len);
833 return nfs_ok;
834 xdr_error:
835 return nfserr_bad_xdr;
836 }
837
838 static __be32
839 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
840 {
841 DECODE_HEAD;
842 u32 dummy;
843
844 memset(open->op_bmval, 0, sizeof(open->op_bmval));
845 open->op_iattr.ia_valid = 0;
846 open->op_openowner = NULL;
847
848 open->op_xdr_error = 0;
849 /* seqid, share_access, share_deny, clientid, ownerlen */
850 READ_BUF(4);
851 open->op_seqid = be32_to_cpup(p++);
852 /* decode, yet ignore deleg_when until supported */
853 status = nfsd4_decode_share_access(argp, &open->op_share_access,
854 &open->op_deleg_want, &dummy);
855 if (status)
856 goto xdr_error;
857 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
858 if (status)
859 goto xdr_error;
860 READ_BUF(sizeof(clientid_t));
861 COPYMEM(&open->op_clientid, sizeof(clientid_t));
862 status = nfsd4_decode_opaque(argp, &open->op_owner);
863 if (status)
864 goto xdr_error;
865 READ_BUF(4);
866 open->op_create = be32_to_cpup(p++);
867 switch (open->op_create) {
868 case NFS4_OPEN_NOCREATE:
869 break;
870 case NFS4_OPEN_CREATE:
871 READ_BUF(4);
872 open->op_createmode = be32_to_cpup(p++);
873 switch (open->op_createmode) {
874 case NFS4_CREATE_UNCHECKED:
875 case NFS4_CREATE_GUARDED:
876 status = nfsd4_decode_fattr(argp, open->op_bmval,
877 &open->op_iattr, &open->op_acl, &open->op_label);
878 if (status)
879 goto out;
880 break;
881 case NFS4_CREATE_EXCLUSIVE:
882 READ_BUF(NFS4_VERIFIER_SIZE);
883 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
884 break;
885 case NFS4_CREATE_EXCLUSIVE4_1:
886 if (argp->minorversion < 1)
887 goto xdr_error;
888 READ_BUF(NFS4_VERIFIER_SIZE);
889 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
890 status = nfsd4_decode_fattr(argp, open->op_bmval,
891 &open->op_iattr, &open->op_acl, &open->op_label);
892 if (status)
893 goto out;
894 break;
895 default:
896 goto xdr_error;
897 }
898 break;
899 default:
900 goto xdr_error;
901 }
902
903 /* open_claim */
904 READ_BUF(4);
905 open->op_claim_type = be32_to_cpup(p++);
906 switch (open->op_claim_type) {
907 case NFS4_OPEN_CLAIM_NULL:
908 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
909 READ_BUF(4);
910 open->op_fname.len = be32_to_cpup(p++);
911 READ_BUF(open->op_fname.len);
912 SAVEMEM(open->op_fname.data, open->op_fname.len);
913 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
914 return status;
915 break;
916 case NFS4_OPEN_CLAIM_PREVIOUS:
917 READ_BUF(4);
918 open->op_delegate_type = be32_to_cpup(p++);
919 break;
920 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
921 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
922 if (status)
923 return status;
924 READ_BUF(4);
925 open->op_fname.len = be32_to_cpup(p++);
926 READ_BUF(open->op_fname.len);
927 SAVEMEM(open->op_fname.data, open->op_fname.len);
928 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
929 return status;
930 break;
931 case NFS4_OPEN_CLAIM_FH:
932 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
933 if (argp->minorversion < 1)
934 goto xdr_error;
935 /* void */
936 break;
937 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
938 if (argp->minorversion < 1)
939 goto xdr_error;
940 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
941 if (status)
942 return status;
943 break;
944 default:
945 goto xdr_error;
946 }
947
948 DECODE_TAIL;
949 }
950
951 static __be32
952 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
953 {
954 DECODE_HEAD;
955
956 if (argp->minorversion >= 1)
957 return nfserr_notsupp;
958
959 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
960 if (status)
961 return status;
962 READ_BUF(4);
963 open_conf->oc_seqid = be32_to_cpup(p++);
964
965 DECODE_TAIL;
966 }
967
968 static __be32
969 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
970 {
971 DECODE_HEAD;
972
973 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
974 if (status)
975 return status;
976 READ_BUF(4);
977 open_down->od_seqid = be32_to_cpup(p++);
978 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
979 &open_down->od_deleg_want, NULL);
980 if (status)
981 return status;
982 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
983 if (status)
984 return status;
985 DECODE_TAIL;
986 }
987
988 static __be32
989 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
990 {
991 DECODE_HEAD;
992
993 READ_BUF(4);
994 putfh->pf_fhlen = be32_to_cpup(p++);
995 if (putfh->pf_fhlen > NFS4_FHSIZE)
996 goto xdr_error;
997 READ_BUF(putfh->pf_fhlen);
998 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
999
1000 DECODE_TAIL;
1001 }
1002
1003 static __be32
1004 nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1005 {
1006 if (argp->minorversion == 0)
1007 return nfs_ok;
1008 return nfserr_notsupp;
1009 }
1010
1011 static __be32
1012 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1013 {
1014 DECODE_HEAD;
1015
1016 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1017 if (status)
1018 return status;
1019 READ_BUF(12);
1020 p = xdr_decode_hyper(p, &read->rd_offset);
1021 read->rd_length = be32_to_cpup(p++);
1022
1023 DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1028 {
1029 DECODE_HEAD;
1030
1031 READ_BUF(24);
1032 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1033 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1034 readdir->rd_dircount = be32_to_cpup(p++);
1035 readdir->rd_maxcount = be32_to_cpup(p++);
1036 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1037 goto out;
1038
1039 DECODE_TAIL;
1040 }
1041
1042 static __be32
1043 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1044 {
1045 DECODE_HEAD;
1046
1047 READ_BUF(4);
1048 remove->rm_namelen = be32_to_cpup(p++);
1049 READ_BUF(remove->rm_namelen);
1050 SAVEMEM(remove->rm_name, remove->rm_namelen);
1051 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1052 return status;
1053
1054 DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1059 {
1060 DECODE_HEAD;
1061
1062 READ_BUF(4);
1063 rename->rn_snamelen = be32_to_cpup(p++);
1064 READ_BUF(rename->rn_snamelen);
1065 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066 READ_BUF(4);
1067 rename->rn_tnamelen = be32_to_cpup(p++);
1068 READ_BUF(rename->rn_tnamelen);
1069 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1070 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1071 return status;
1072 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1073 return status;
1074
1075 DECODE_TAIL;
1076 }
1077
1078 static __be32
1079 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1080 {
1081 DECODE_HEAD;
1082
1083 if (argp->minorversion >= 1)
1084 return nfserr_notsupp;
1085
1086 READ_BUF(sizeof(clientid_t));
1087 COPYMEM(clientid, sizeof(clientid_t));
1088
1089 DECODE_TAIL;
1090 }
1091
1092 static __be32
1093 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1094 struct nfsd4_secinfo *secinfo)
1095 {
1096 DECODE_HEAD;
1097
1098 READ_BUF(4);
1099 secinfo->si_namelen = be32_to_cpup(p++);
1100 READ_BUF(secinfo->si_namelen);
1101 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1102 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1103 if (status)
1104 return status;
1105 DECODE_TAIL;
1106 }
1107
1108 static __be32
1109 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1110 struct nfsd4_secinfo_no_name *sin)
1111 {
1112 DECODE_HEAD;
1113
1114 READ_BUF(4);
1115 sin->sin_style = be32_to_cpup(p++);
1116 DECODE_TAIL;
1117 }
1118
1119 static __be32
1120 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1121 {
1122 __be32 status;
1123
1124 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1125 if (status)
1126 return status;
1127 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1128 &setattr->sa_acl, &setattr->sa_label);
1129 }
1130
1131 static __be32
1132 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1133 {
1134 DECODE_HEAD;
1135
1136 if (argp->minorversion >= 1)
1137 return nfserr_notsupp;
1138
1139 READ_BUF(NFS4_VERIFIER_SIZE);
1140 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1141
1142 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1143 if (status)
1144 return nfserr_bad_xdr;
1145 READ_BUF(8);
1146 setclientid->se_callback_prog = be32_to_cpup(p++);
1147 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1148 READ_BUF(setclientid->se_callback_netid_len);
1149 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150 READ_BUF(4);
1151 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1152
1153 READ_BUF(setclientid->se_callback_addr_len);
1154 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1155 READ_BUF(4);
1156 setclientid->se_callback_ident = be32_to_cpup(p++);
1157
1158 DECODE_TAIL;
1159 }
1160
1161 static __be32
1162 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1163 {
1164 DECODE_HEAD;
1165
1166 if (argp->minorversion >= 1)
1167 return nfserr_notsupp;
1168
1169 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1170 COPYMEM(&scd_c->sc_clientid, 8);
1171 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1172
1173 DECODE_TAIL;
1174 }
1175
1176 /* Also used for NVERIFY */
1177 static __be32
1178 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1179 {
1180 DECODE_HEAD;
1181
1182 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1183 goto out;
1184
1185 /* For convenience's sake, we compare raw xdr'd attributes in
1186 * nfsd4_proc_verify */
1187
1188 READ_BUF(4);
1189 verify->ve_attrlen = be32_to_cpup(p++);
1190 READ_BUF(verify->ve_attrlen);
1191 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1192
1193 DECODE_TAIL;
1194 }
1195
1196 static __be32
1197 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1198 {
1199 int avail;
1200 int len;
1201 DECODE_HEAD;
1202
1203 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1204 if (status)
1205 return status;
1206 READ_BUF(16);
1207 p = xdr_decode_hyper(p, &write->wr_offset);
1208 write->wr_stable_how = be32_to_cpup(p++);
1209 if (write->wr_stable_how > 2)
1210 goto xdr_error;
1211 write->wr_buflen = be32_to_cpup(p++);
1212
1213 /* Sorry .. no magic macros for this.. *
1214 * READ_BUF(write->wr_buflen);
1215 * SAVEMEM(write->wr_buf, write->wr_buflen);
1216 */
1217 avail = (char*)argp->end - (char*)argp->p;
1218 if (avail + argp->pagelen < write->wr_buflen) {
1219 dprintk("NFSD: xdr error (%s:%d)\n",
1220 __FILE__, __LINE__);
1221 goto xdr_error;
1222 }
1223 write->wr_head.iov_base = p;
1224 write->wr_head.iov_len = avail;
1225 write->wr_pagelist = argp->pagelist;
1226
1227 len = XDR_QUADLEN(write->wr_buflen) << 2;
1228 if (len >= avail) {
1229 int pages;
1230
1231 len -= avail;
1232
1233 pages = len >> PAGE_SHIFT;
1234 argp->pagelist += pages;
1235 argp->pagelen -= pages * PAGE_SIZE;
1236 len -= pages * PAGE_SIZE;
1237
1238 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1239 argp->pagelist++;
1240 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1241 }
1242 argp->p += XDR_QUADLEN(len);
1243
1244 DECODE_TAIL;
1245 }
1246
1247 static __be32
1248 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1249 {
1250 DECODE_HEAD;
1251
1252 if (argp->minorversion >= 1)
1253 return nfserr_notsupp;
1254
1255 READ_BUF(12);
1256 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1257 rlockowner->rl_owner.len = be32_to_cpup(p++);
1258 READ_BUF(rlockowner->rl_owner.len);
1259 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1260
1261 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1262 return nfserr_inval;
1263 DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1268 struct nfsd4_exchange_id *exid)
1269 {
1270 int dummy, tmp;
1271 DECODE_HEAD;
1272
1273 READ_BUF(NFS4_VERIFIER_SIZE);
1274 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1275
1276 status = nfsd4_decode_opaque(argp, &exid->clname);
1277 if (status)
1278 return nfserr_bad_xdr;
1279
1280 READ_BUF(4);
1281 exid->flags = be32_to_cpup(p++);
1282
1283 /* Ignore state_protect4_a */
1284 READ_BUF(4);
1285 exid->spa_how = be32_to_cpup(p++);
1286 switch (exid->spa_how) {
1287 case SP4_NONE:
1288 break;
1289 case SP4_MACH_CRED:
1290 /* spo_must_enforce */
1291 READ_BUF(4);
1292 dummy = be32_to_cpup(p++);
1293 READ_BUF(dummy * 4);
1294 p += dummy;
1295
1296 /* spo_must_allow */
1297 READ_BUF(4);
1298 dummy = be32_to_cpup(p++);
1299 READ_BUF(dummy * 4);
1300 p += dummy;
1301 break;
1302 case SP4_SSV:
1303 /* ssp_ops */
1304 READ_BUF(4);
1305 dummy = be32_to_cpup(p++);
1306 READ_BUF(dummy * 4);
1307 p += dummy;
1308
1309 READ_BUF(4);
1310 dummy = be32_to_cpup(p++);
1311 READ_BUF(dummy * 4);
1312 p += dummy;
1313
1314 /* ssp_hash_algs<> */
1315 READ_BUF(4);
1316 tmp = be32_to_cpup(p++);
1317 while (tmp--) {
1318 READ_BUF(4);
1319 dummy = be32_to_cpup(p++);
1320 READ_BUF(dummy);
1321 p += XDR_QUADLEN(dummy);
1322 }
1323
1324 /* ssp_encr_algs<> */
1325 READ_BUF(4);
1326 tmp = be32_to_cpup(p++);
1327 while (tmp--) {
1328 READ_BUF(4);
1329 dummy = be32_to_cpup(p++);
1330 READ_BUF(dummy);
1331 p += XDR_QUADLEN(dummy);
1332 }
1333
1334 /* ssp_window and ssp_num_gss_handles */
1335 READ_BUF(8);
1336 dummy = be32_to_cpup(p++);
1337 dummy = be32_to_cpup(p++);
1338 break;
1339 default:
1340 goto xdr_error;
1341 }
1342
1343 /* Ignore Implementation ID */
1344 READ_BUF(4); /* nfs_impl_id4 array length */
1345 dummy = be32_to_cpup(p++);
1346
1347 if (dummy > 1)
1348 goto xdr_error;
1349
1350 if (dummy == 1) {
1351 /* nii_domain */
1352 READ_BUF(4);
1353 dummy = be32_to_cpup(p++);
1354 READ_BUF(dummy);
1355 p += XDR_QUADLEN(dummy);
1356
1357 /* nii_name */
1358 READ_BUF(4);
1359 dummy = be32_to_cpup(p++);
1360 READ_BUF(dummy);
1361 p += XDR_QUADLEN(dummy);
1362
1363 /* nii_date */
1364 READ_BUF(12);
1365 p += 3;
1366 }
1367 DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1372 struct nfsd4_create_session *sess)
1373 {
1374 DECODE_HEAD;
1375 u32 dummy;
1376
1377 READ_BUF(16);
1378 COPYMEM(&sess->clientid, 8);
1379 sess->seqid = be32_to_cpup(p++);
1380 sess->flags = be32_to_cpup(p++);
1381
1382 /* Fore channel attrs */
1383 READ_BUF(28);
1384 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1385 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1386 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1387 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1388 sess->fore_channel.maxops = be32_to_cpup(p++);
1389 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1390 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1391 if (sess->fore_channel.nr_rdma_attrs == 1) {
1392 READ_BUF(4);
1393 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1394 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1395 dprintk("Too many fore channel attr bitmaps!\n");
1396 goto xdr_error;
1397 }
1398
1399 /* Back channel attrs */
1400 READ_BUF(28);
1401 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1402 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1403 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1404 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1405 sess->back_channel.maxops = be32_to_cpup(p++);
1406 sess->back_channel.maxreqs = be32_to_cpup(p++);
1407 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1408 if (sess->back_channel.nr_rdma_attrs == 1) {
1409 READ_BUF(4);
1410 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1411 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1412 dprintk("Too many back channel attr bitmaps!\n");
1413 goto xdr_error;
1414 }
1415
1416 READ_BUF(4);
1417 sess->callback_prog = be32_to_cpup(p++);
1418 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1419 DECODE_TAIL;
1420 }
1421
1422 static __be32
1423 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1424 struct nfsd4_destroy_session *destroy_session)
1425 {
1426 DECODE_HEAD;
1427 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1428 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1429
1430 DECODE_TAIL;
1431 }
1432
1433 static __be32
1434 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1435 struct nfsd4_free_stateid *free_stateid)
1436 {
1437 DECODE_HEAD;
1438
1439 READ_BUF(sizeof(stateid_t));
1440 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1441 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1442
1443 DECODE_TAIL;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1448 struct nfsd4_sequence *seq)
1449 {
1450 DECODE_HEAD;
1451
1452 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1453 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1454 seq->seqid = be32_to_cpup(p++);
1455 seq->slotid = be32_to_cpup(p++);
1456 seq->maxslots = be32_to_cpup(p++);
1457 seq->cachethis = be32_to_cpup(p++);
1458
1459 DECODE_TAIL;
1460 }
1461
1462 static __be32
1463 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1464 {
1465 int i;
1466 __be32 *p, status;
1467 struct nfsd4_test_stateid_id *stateid;
1468
1469 READ_BUF(4);
1470 test_stateid->ts_num_ids = ntohl(*p++);
1471
1472 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1473
1474 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1475 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1476 if (!stateid) {
1477 status = nfserrno(-ENOMEM);
1478 goto out;
1479 }
1480
1481 INIT_LIST_HEAD(&stateid->ts_id_list);
1482 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1483
1484 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1485 if (status)
1486 goto out;
1487 }
1488
1489 status = 0;
1490 out:
1491 return status;
1492 xdr_error:
1493 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1494 status = nfserr_bad_xdr;
1495 goto out;
1496 }
1497
1498 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1499 {
1500 DECODE_HEAD;
1501
1502 READ_BUF(8);
1503 COPYMEM(&dc->clientid, 8);
1504
1505 DECODE_TAIL;
1506 }
1507
1508 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1509 {
1510 DECODE_HEAD;
1511
1512 READ_BUF(4);
1513 rc->rca_one_fs = be32_to_cpup(p++);
1514
1515 DECODE_TAIL;
1516 }
1517
1518 static __be32
1519 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1520 {
1521 DECODE_HEAD;
1522
1523 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1524 if (status)
1525 return status;
1526
1527 READ_BUF(8 + 4);
1528 p = xdr_decode_hyper(p, &seek->seek_offset);
1529 seek->seek_whence = be32_to_cpup(p);
1530
1531 DECODE_TAIL;
1532 }
1533
1534 static __be32
1535 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1536 {
1537 return nfs_ok;
1538 }
1539
1540 static __be32
1541 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1542 {
1543 return nfserr_notsupp;
1544 }
1545
1546 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1547
1548 static nfsd4_dec nfsd4_dec_ops[] = {
1549 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1550 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1551 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1552 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1553 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1554 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1555 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1556 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1557 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1558 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1559 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1560 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1561 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1562 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1563 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1564 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1565 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1566 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1567 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1568 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1569 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1570 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1571 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1572 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1573 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1574 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1575 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1576 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1577 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1578 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1579 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1580 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1581 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1582 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1583 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1584 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1585 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1586
1587 /* new operations for NFSv4.1 */
1588 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1589 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1590 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1591 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1592 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1593 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1594 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1595 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1596 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1597 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1598 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1599 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1600 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1601 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1602 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1603 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1604 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1605 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1606 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1607
1608 /* new operations for NFSv4.2 */
1609 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp,
1610 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1611 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1612 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp,
1613 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1614 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1615 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1616 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1617 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1618 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1619 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1620 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1621 };
1622
1623 static inline bool
1624 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1625 {
1626 if (op->opnum < FIRST_NFS4_OP)
1627 return false;
1628 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1629 return false;
1630 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1631 return false;
1632 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1633 return false;
1634 return true;
1635 }
1636
1637 static __be32
1638 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1639 {
1640 DECODE_HEAD;
1641 struct nfsd4_op *op;
1642 bool cachethis = false;
1643 int auth_slack= argp->rqstp->rq_auth_slack;
1644 int max_reply = auth_slack + 8; /* opcnt, status */
1645 int readcount = 0;
1646 int readbytes = 0;
1647 int i;
1648
1649 READ_BUF(4);
1650 argp->taglen = be32_to_cpup(p++);
1651 READ_BUF(argp->taglen);
1652 SAVEMEM(argp->tag, argp->taglen);
1653 READ_BUF(8);
1654 argp->minorversion = be32_to_cpup(p++);
1655 argp->opcnt = be32_to_cpup(p++);
1656 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1657
1658 if (argp->taglen > NFSD4_MAX_TAGLEN)
1659 goto xdr_error;
1660 if (argp->opcnt > 100)
1661 goto xdr_error;
1662
1663 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1664 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1665 if (!argp->ops) {
1666 argp->ops = argp->iops;
1667 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1668 goto xdr_error;
1669 }
1670 }
1671
1672 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1673 argp->opcnt = 0;
1674
1675 for (i = 0; i < argp->opcnt; i++) {
1676 op = &argp->ops[i];
1677 op->replay = NULL;
1678
1679 READ_BUF(4);
1680 op->opnum = be32_to_cpup(p++);
1681
1682 if (nfsd4_opnum_in_range(argp, op))
1683 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1684 else {
1685 op->opnum = OP_ILLEGAL;
1686 op->status = nfserr_op_illegal;
1687 }
1688 /*
1689 * We'll try to cache the result in the DRC if any one
1690 * op in the compound wants to be cached:
1691 */
1692 cachethis |= nfsd4_cache_this_op(op);
1693
1694 if (op->opnum == OP_READ) {
1695 readcount++;
1696 readbytes += nfsd4_max_reply(argp->rqstp, op);
1697 } else
1698 max_reply += nfsd4_max_reply(argp->rqstp, op);
1699 /*
1700 * OP_LOCK may return a conflicting lock. (Special case
1701 * because it will just skip encoding this if it runs
1702 * out of xdr buffer space, and it is the only operation
1703 * that behaves this way.)
1704 */
1705 if (op->opnum == OP_LOCK)
1706 max_reply += NFS4_OPAQUE_LIMIT;
1707
1708 if (op->status) {
1709 argp->opcnt = i+1;
1710 break;
1711 }
1712 }
1713 /* Sessions make the DRC unnecessary: */
1714 if (argp->minorversion)
1715 cachethis = false;
1716 svc_reserve(argp->rqstp, max_reply + readbytes);
1717 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1718
1719 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1720 argp->rqstp->rq_splice_ok = false;
1721
1722 DECODE_TAIL;
1723 }
1724
1725 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1726 {
1727 if (IS_I_VERSION(inode)) {
1728 p = xdr_encode_hyper(p, inode->i_version);
1729 } else {
1730 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1731 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1732 }
1733 return p;
1734 }
1735
1736 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1737 {
1738 *p++ = cpu_to_be32(c->atomic);
1739 if (c->change_supported) {
1740 p = xdr_encode_hyper(p, c->before_change);
1741 p = xdr_encode_hyper(p, c->after_change);
1742 } else {
1743 *p++ = cpu_to_be32(c->before_ctime_sec);
1744 *p++ = cpu_to_be32(c->before_ctime_nsec);
1745 *p++ = cpu_to_be32(c->after_ctime_sec);
1746 *p++ = cpu_to_be32(c->after_ctime_nsec);
1747 }
1748 return p;
1749 }
1750
1751 /* Encode as an array of strings the string given with components
1752 * separated @sep, escaped with esc_enter and esc_exit.
1753 */
1754 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1755 char *components, char esc_enter,
1756 char esc_exit)
1757 {
1758 __be32 *p;
1759 __be32 pathlen;
1760 int pathlen_offset;
1761 int strlen, count=0;
1762 char *str, *end, *next;
1763
1764 dprintk("nfsd4_encode_components(%s)\n", components);
1765
1766 pathlen_offset = xdr->buf->len;
1767 p = xdr_reserve_space(xdr, 4);
1768 if (!p)
1769 return nfserr_resource;
1770 p++; /* We will fill this in with @count later */
1771
1772 end = str = components;
1773 while (*end) {
1774 bool found_esc = false;
1775
1776 /* try to parse as esc_start, ..., esc_end, sep */
1777 if (*str == esc_enter) {
1778 for (; *end && (*end != esc_exit); end++)
1779 /* find esc_exit or end of string */;
1780 next = end + 1;
1781 if (*end && (!*next || *next == sep)) {
1782 str++;
1783 found_esc = true;
1784 }
1785 }
1786
1787 if (!found_esc)
1788 for (; *end && (*end != sep); end++)
1789 /* find sep or end of string */;
1790
1791 strlen = end - str;
1792 if (strlen) {
1793 p = xdr_reserve_space(xdr, strlen + 4);
1794 if (!p)
1795 return nfserr_resource;
1796 p = xdr_encode_opaque(p, str, strlen);
1797 count++;
1798 }
1799 else
1800 end++;
1801 if (found_esc)
1802 end = next;
1803
1804 str = end;
1805 }
1806 pathlen = htonl(count);
1807 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1808 return 0;
1809 }
1810
1811 /* Encode as an array of strings the string given with components
1812 * separated @sep.
1813 */
1814 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1815 char *components)
1816 {
1817 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1818 }
1819
1820 /*
1821 * encode a location element of a fs_locations structure
1822 */
1823 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1824 struct nfsd4_fs_location *location)
1825 {
1826 __be32 status;
1827
1828 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1829 '[', ']');
1830 if (status)
1831 return status;
1832 status = nfsd4_encode_components(xdr, '/', location->path);
1833 if (status)
1834 return status;
1835 return 0;
1836 }
1837
1838 /*
1839 * Encode a path in RFC3530 'pathname4' format
1840 */
1841 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1842 const struct path *root,
1843 const struct path *path)
1844 {
1845 struct path cur = *path;
1846 __be32 *p;
1847 struct dentry **components = NULL;
1848 unsigned int ncomponents = 0;
1849 __be32 err = nfserr_jukebox;
1850
1851 dprintk("nfsd4_encode_components(");
1852
1853 path_get(&cur);
1854 /* First walk the path up to the nfsd root, and store the
1855 * dentries/path components in an array.
1856 */
1857 for (;;) {
1858 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1859 break;
1860 if (cur.dentry == cur.mnt->mnt_root) {
1861 if (follow_up(&cur))
1862 continue;
1863 goto out_free;
1864 }
1865 if ((ncomponents & 15) == 0) {
1866 struct dentry **new;
1867 new = krealloc(components,
1868 sizeof(*new) * (ncomponents + 16),
1869 GFP_KERNEL);
1870 if (!new)
1871 goto out_free;
1872 components = new;
1873 }
1874 components[ncomponents++] = cur.dentry;
1875 cur.dentry = dget_parent(cur.dentry);
1876 }
1877 err = nfserr_resource;
1878 p = xdr_reserve_space(xdr, 4);
1879 if (!p)
1880 goto out_free;
1881 *p++ = cpu_to_be32(ncomponents);
1882
1883 while (ncomponents) {
1884 struct dentry *dentry = components[ncomponents - 1];
1885 unsigned int len;
1886
1887 spin_lock(&dentry->d_lock);
1888 len = dentry->d_name.len;
1889 p = xdr_reserve_space(xdr, len + 4);
1890 if (!p) {
1891 spin_unlock(&dentry->d_lock);
1892 goto out_free;
1893 }
1894 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1895 dprintk("/%s", dentry->d_name.name);
1896 spin_unlock(&dentry->d_lock);
1897 dput(dentry);
1898 ncomponents--;
1899 }
1900
1901 err = 0;
1902 out_free:
1903 dprintk(")\n");
1904 while (ncomponents)
1905 dput(components[--ncomponents]);
1906 kfree(components);
1907 path_put(&cur);
1908 return err;
1909 }
1910
1911 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1912 struct svc_rqst *rqstp, const struct path *path)
1913 {
1914 struct svc_export *exp_ps;
1915 __be32 res;
1916
1917 exp_ps = rqst_find_fsidzero_export(rqstp);
1918 if (IS_ERR(exp_ps))
1919 return nfserrno(PTR_ERR(exp_ps));
1920 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1921 exp_put(exp_ps);
1922 return res;
1923 }
1924
1925 /*
1926 * encode a fs_locations structure
1927 */
1928 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1929 struct svc_rqst *rqstp, struct svc_export *exp)
1930 {
1931 __be32 status;
1932 int i;
1933 __be32 *p;
1934 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1935
1936 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1937 if (status)
1938 return status;
1939 p = xdr_reserve_space(xdr, 4);
1940 if (!p)
1941 return nfserr_resource;
1942 *p++ = cpu_to_be32(fslocs->locations_count);
1943 for (i=0; i<fslocs->locations_count; i++) {
1944 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1945 if (status)
1946 return status;
1947 }
1948 return 0;
1949 }
1950
1951 static u32 nfs4_file_type(umode_t mode)
1952 {
1953 switch (mode & S_IFMT) {
1954 case S_IFIFO: return NF4FIFO;
1955 case S_IFCHR: return NF4CHR;
1956 case S_IFDIR: return NF4DIR;
1957 case S_IFBLK: return NF4BLK;
1958 case S_IFLNK: return NF4LNK;
1959 case S_IFREG: return NF4REG;
1960 case S_IFSOCK: return NF4SOCK;
1961 default: return NF4BAD;
1962 };
1963 }
1964
1965 static inline __be32
1966 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1967 struct nfs4_ace *ace)
1968 {
1969 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1970 return nfs4_acl_write_who(xdr, ace->whotype);
1971 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1972 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1973 else
1974 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1975 }
1976
1977 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1978 FATTR4_WORD0_RDATTR_ERROR)
1979 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1980 #define WORD2_ABSENT_FS_ATTRS 0
1981
1982 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1983 static inline __be32
1984 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1985 void *context, int len)
1986 {
1987 __be32 *p;
1988
1989 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1990 if (!p)
1991 return nfserr_resource;
1992
1993 /*
1994 * For now we use a 0 here to indicate the null translation; in
1995 * the future we may place a call to translation code here.
1996 */
1997 *p++ = cpu_to_be32(0); /* lfs */
1998 *p++ = cpu_to_be32(0); /* pi */
1999 p = xdr_encode_opaque(p, context, len);
2000 return 0;
2001 }
2002 #else
2003 static inline __be32
2004 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2005 void *context, int len)
2006 { return 0; }
2007 #endif
2008
2009 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2010 {
2011 /* As per referral draft: */
2012 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2013 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2014 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2015 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2016 *rdattr_err = NFSERR_MOVED;
2017 else
2018 return nfserr_moved;
2019 }
2020 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2021 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2022 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2023 return 0;
2024 }
2025
2026
2027 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2028 {
2029 struct path path = exp->ex_path;
2030 int err;
2031
2032 path_get(&path);
2033 while (follow_up(&path)) {
2034 if (path.dentry != path.mnt->mnt_root)
2035 break;
2036 }
2037 err = vfs_getattr(&path, stat);
2038 path_put(&path);
2039 return err;
2040 }
2041
2042 /*
2043 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2044 * ourselves.
2045 */
2046 static __be32
2047 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2048 struct svc_export *exp,
2049 struct dentry *dentry, u32 *bmval,
2050 struct svc_rqst *rqstp, int ignore_crossmnt)
2051 {
2052 u32 bmval0 = bmval[0];
2053 u32 bmval1 = bmval[1];
2054 u32 bmval2 = bmval[2];
2055 struct kstat stat;
2056 struct svc_fh *tempfh = NULL;
2057 struct kstatfs statfs;
2058 __be32 *p;
2059 int starting_len = xdr->buf->len;
2060 int attrlen_offset;
2061 __be32 attrlen;
2062 u32 dummy;
2063 u64 dummy64;
2064 u32 rdattr_err = 0;
2065 __be32 status;
2066 int err;
2067 int aclsupport = 0;
2068 struct nfs4_acl *acl = NULL;
2069 void *context = NULL;
2070 int contextlen;
2071 bool contextsupport = false;
2072 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2073 u32 minorversion = resp->cstate.minorversion;
2074 struct path path = {
2075 .mnt = exp->ex_path.mnt,
2076 .dentry = dentry,
2077 };
2078 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2079
2080 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2081 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2082 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2083 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2084
2085 if (exp->ex_fslocs.migrated) {
2086 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2087 if (status)
2088 goto out;
2089 }
2090
2091 err = vfs_getattr(&path, &stat);
2092 if (err)
2093 goto out_nfserr;
2094 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2095 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2096 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2097 FATTR4_WORD1_SPACE_TOTAL))) {
2098 err = vfs_statfs(&path, &statfs);
2099 if (err)
2100 goto out_nfserr;
2101 }
2102 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2103 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2104 status = nfserr_jukebox;
2105 if (!tempfh)
2106 goto out;
2107 fh_init(tempfh, NFS4_FHSIZE);
2108 status = fh_compose(tempfh, exp, dentry, NULL);
2109 if (status)
2110 goto out;
2111 fhp = tempfh;
2112 }
2113 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2114 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2115 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2116 aclsupport = (err == 0);
2117 if (bmval0 & FATTR4_WORD0_ACL) {
2118 if (err == -EOPNOTSUPP)
2119 bmval0 &= ~FATTR4_WORD0_ACL;
2120 else if (err == -EINVAL) {
2121 status = nfserr_attrnotsupp;
2122 goto out;
2123 } else if (err != 0)
2124 goto out_nfserr;
2125 }
2126 }
2127
2128 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2129 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2130 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2131 err = security_inode_getsecctx(dentry->d_inode,
2132 &context, &contextlen);
2133 contextsupport = (err == 0);
2134 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2135 if (err == -EOPNOTSUPP)
2136 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2137 else if (err)
2138 goto out_nfserr;
2139 }
2140 }
2141 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2142
2143 if (bmval2) {
2144 p = xdr_reserve_space(xdr, 16);
2145 if (!p)
2146 goto out_resource;
2147 *p++ = cpu_to_be32(3);
2148 *p++ = cpu_to_be32(bmval0);
2149 *p++ = cpu_to_be32(bmval1);
2150 *p++ = cpu_to_be32(bmval2);
2151 } else if (bmval1) {
2152 p = xdr_reserve_space(xdr, 12);
2153 if (!p)
2154 goto out_resource;
2155 *p++ = cpu_to_be32(2);
2156 *p++ = cpu_to_be32(bmval0);
2157 *p++ = cpu_to_be32(bmval1);
2158 } else {
2159 p = xdr_reserve_space(xdr, 8);
2160 if (!p)
2161 goto out_resource;
2162 *p++ = cpu_to_be32(1);
2163 *p++ = cpu_to_be32(bmval0);
2164 }
2165
2166 attrlen_offset = xdr->buf->len;
2167 p = xdr_reserve_space(xdr, 4);
2168 if (!p)
2169 goto out_resource;
2170 p++; /* to be backfilled later */
2171
2172 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2173 u32 word0 = nfsd_suppattrs0(minorversion);
2174 u32 word1 = nfsd_suppattrs1(minorversion);
2175 u32 word2 = nfsd_suppattrs2(minorversion);
2176
2177 if (!aclsupport)
2178 word0 &= ~FATTR4_WORD0_ACL;
2179 if (!contextsupport)
2180 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2181 if (!word2) {
2182 p = xdr_reserve_space(xdr, 12);
2183 if (!p)
2184 goto out_resource;
2185 *p++ = cpu_to_be32(2);
2186 *p++ = cpu_to_be32(word0);
2187 *p++ = cpu_to_be32(word1);
2188 } else {
2189 p = xdr_reserve_space(xdr, 16);
2190 if (!p)
2191 goto out_resource;
2192 *p++ = cpu_to_be32(3);
2193 *p++ = cpu_to_be32(word0);
2194 *p++ = cpu_to_be32(word1);
2195 *p++ = cpu_to_be32(word2);
2196 }
2197 }
2198 if (bmval0 & FATTR4_WORD0_TYPE) {
2199 p = xdr_reserve_space(xdr, 4);
2200 if (!p)
2201 goto out_resource;
2202 dummy = nfs4_file_type(stat.mode);
2203 if (dummy == NF4BAD) {
2204 status = nfserr_serverfault;
2205 goto out;
2206 }
2207 *p++ = cpu_to_be32(dummy);
2208 }
2209 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2210 p = xdr_reserve_space(xdr, 4);
2211 if (!p)
2212 goto out_resource;
2213 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2214 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2215 else
2216 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2217 NFS4_FH_VOL_RENAME);
2218 }
2219 if (bmval0 & FATTR4_WORD0_CHANGE) {
2220 p = xdr_reserve_space(xdr, 8);
2221 if (!p)
2222 goto out_resource;
2223 p = encode_change(p, &stat, dentry->d_inode);
2224 }
2225 if (bmval0 & FATTR4_WORD0_SIZE) {
2226 p = xdr_reserve_space(xdr, 8);
2227 if (!p)
2228 goto out_resource;
2229 p = xdr_encode_hyper(p, stat.size);
2230 }
2231 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2232 p = xdr_reserve_space(xdr, 4);
2233 if (!p)
2234 goto out_resource;
2235 *p++ = cpu_to_be32(1);
2236 }
2237 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2238 p = xdr_reserve_space(xdr, 4);
2239 if (!p)
2240 goto out_resource;
2241 *p++ = cpu_to_be32(1);
2242 }
2243 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2244 p = xdr_reserve_space(xdr, 4);
2245 if (!p)
2246 goto out_resource;
2247 *p++ = cpu_to_be32(0);
2248 }
2249 if (bmval0 & FATTR4_WORD0_FSID) {
2250 p = xdr_reserve_space(xdr, 16);
2251 if (!p)
2252 goto out_resource;
2253 if (exp->ex_fslocs.migrated) {
2254 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2255 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2256 } else switch(fsid_source(fhp)) {
2257 case FSIDSOURCE_FSID:
2258 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2259 p = xdr_encode_hyper(p, (u64)0);
2260 break;
2261 case FSIDSOURCE_DEV:
2262 *p++ = cpu_to_be32(0);
2263 *p++ = cpu_to_be32(MAJOR(stat.dev));
2264 *p++ = cpu_to_be32(0);
2265 *p++ = cpu_to_be32(MINOR(stat.dev));
2266 break;
2267 case FSIDSOURCE_UUID:
2268 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2269 EX_UUID_LEN);
2270 break;
2271 }
2272 }
2273 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2274 p = xdr_reserve_space(xdr, 4);
2275 if (!p)
2276 goto out_resource;
2277 *p++ = cpu_to_be32(0);
2278 }
2279 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2280 p = xdr_reserve_space(xdr, 4);
2281 if (!p)
2282 goto out_resource;
2283 *p++ = cpu_to_be32(nn->nfsd4_lease);
2284 }
2285 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2286 p = xdr_reserve_space(xdr, 4);
2287 if (!p)
2288 goto out_resource;
2289 *p++ = cpu_to_be32(rdattr_err);
2290 }
2291 if (bmval0 & FATTR4_WORD0_ACL) {
2292 struct nfs4_ace *ace;
2293
2294 if (acl == NULL) {
2295 p = xdr_reserve_space(xdr, 4);
2296 if (!p)
2297 goto out_resource;
2298
2299 *p++ = cpu_to_be32(0);
2300 goto out_acl;
2301 }
2302 p = xdr_reserve_space(xdr, 4);
2303 if (!p)
2304 goto out_resource;
2305 *p++ = cpu_to_be32(acl->naces);
2306
2307 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2308 p = xdr_reserve_space(xdr, 4*3);
2309 if (!p)
2310 goto out_resource;
2311 *p++ = cpu_to_be32(ace->type);
2312 *p++ = cpu_to_be32(ace->flag);
2313 *p++ = cpu_to_be32(ace->access_mask &
2314 NFS4_ACE_MASK_ALL);
2315 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2316 if (status)
2317 goto out;
2318 }
2319 }
2320 out_acl:
2321 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2322 p = xdr_reserve_space(xdr, 4);
2323 if (!p)
2324 goto out_resource;
2325 *p++ = cpu_to_be32(aclsupport ?
2326 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2327 }
2328 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2329 p = xdr_reserve_space(xdr, 4);
2330 if (!p)
2331 goto out_resource;
2332 *p++ = cpu_to_be32(1);
2333 }
2334 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2335 p = xdr_reserve_space(xdr, 4);
2336 if (!p)
2337 goto out_resource;
2338 *p++ = cpu_to_be32(0);
2339 }
2340 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2341 p = xdr_reserve_space(xdr, 4);
2342 if (!p)
2343 goto out_resource;
2344 *p++ = cpu_to_be32(1);
2345 }
2346 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2347 p = xdr_reserve_space(xdr, 4);
2348 if (!p)
2349 goto out_resource;
2350 *p++ = cpu_to_be32(1);
2351 }
2352 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2353 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2354 if (!p)
2355 goto out_resource;
2356 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2357 fhp->fh_handle.fh_size);
2358 }
2359 if (bmval0 & FATTR4_WORD0_FILEID) {
2360 p = xdr_reserve_space(xdr, 8);
2361 if (!p)
2362 goto out_resource;
2363 p = xdr_encode_hyper(p, stat.ino);
2364 }
2365 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2366 p = xdr_reserve_space(xdr, 8);
2367 if (!p)
2368 goto out_resource;
2369 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2370 }
2371 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2372 p = xdr_reserve_space(xdr, 8);
2373 if (!p)
2374 goto out_resource;
2375 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2376 }
2377 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2378 p = xdr_reserve_space(xdr, 8);
2379 if (!p)
2380 goto out_resource;
2381 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2382 }
2383 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2384 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2385 if (status)
2386 goto out;
2387 }
2388 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2389 p = xdr_reserve_space(xdr, 4);
2390 if (!p)
2391 goto out_resource;
2392 *p++ = cpu_to_be32(1);
2393 }
2394 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2395 p = xdr_reserve_space(xdr, 8);
2396 if (!p)
2397 goto out_resource;
2398 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2399 }
2400 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2401 p = xdr_reserve_space(xdr, 4);
2402 if (!p)
2403 goto out_resource;
2404 *p++ = cpu_to_be32(255);
2405 }
2406 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2407 p = xdr_reserve_space(xdr, 4);
2408 if (!p)
2409 goto out_resource;
2410 *p++ = cpu_to_be32(statfs.f_namelen);
2411 }
2412 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2413 p = xdr_reserve_space(xdr, 8);
2414 if (!p)
2415 goto out_resource;
2416 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2417 }
2418 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2419 p = xdr_reserve_space(xdr, 8);
2420 if (!p)
2421 goto out_resource;
2422 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2423 }
2424 if (bmval1 & FATTR4_WORD1_MODE) {
2425 p = xdr_reserve_space(xdr, 4);
2426 if (!p)
2427 goto out_resource;
2428 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2429 }
2430 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2431 p = xdr_reserve_space(xdr, 4);
2432 if (!p)
2433 goto out_resource;
2434 *p++ = cpu_to_be32(1);
2435 }
2436 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2437 p = xdr_reserve_space(xdr, 4);
2438 if (!p)
2439 goto out_resource;
2440 *p++ = cpu_to_be32(stat.nlink);
2441 }
2442 if (bmval1 & FATTR4_WORD1_OWNER) {
2443 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2444 if (status)
2445 goto out;
2446 }
2447 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2448 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2449 if (status)
2450 goto out;
2451 }
2452 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2453 p = xdr_reserve_space(xdr, 8);
2454 if (!p)
2455 goto out_resource;
2456 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2457 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2458 }
2459 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2460 p = xdr_reserve_space(xdr, 8);
2461 if (!p)
2462 goto out_resource;
2463 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2464 p = xdr_encode_hyper(p, dummy64);
2465 }
2466 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2467 p = xdr_reserve_space(xdr, 8);
2468 if (!p)
2469 goto out_resource;
2470 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2471 p = xdr_encode_hyper(p, dummy64);
2472 }
2473 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2474 p = xdr_reserve_space(xdr, 8);
2475 if (!p)
2476 goto out_resource;
2477 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2478 p = xdr_encode_hyper(p, dummy64);
2479 }
2480 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2481 p = xdr_reserve_space(xdr, 8);
2482 if (!p)
2483 goto out_resource;
2484 dummy64 = (u64)stat.blocks << 9;
2485 p = xdr_encode_hyper(p, dummy64);
2486 }
2487 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2488 p = xdr_reserve_space(xdr, 12);
2489 if (!p)
2490 goto out_resource;
2491 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2492 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2493 }
2494 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2495 p = xdr_reserve_space(xdr, 12);
2496 if (!p)
2497 goto out_resource;
2498 *p++ = cpu_to_be32(0);
2499 *p++ = cpu_to_be32(1);
2500 *p++ = cpu_to_be32(0);
2501 }
2502 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2503 p = xdr_reserve_space(xdr, 12);
2504 if (!p)
2505 goto out_resource;
2506 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2507 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2508 }
2509 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2510 p = xdr_reserve_space(xdr, 12);
2511 if (!p)
2512 goto out_resource;
2513 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2514 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2515 }
2516 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2517 p = xdr_reserve_space(xdr, 8);
2518 if (!p)
2519 goto out_resource;
2520 /*
2521 * Get parent's attributes if not ignoring crossmount
2522 * and this is the root of a cross-mounted filesystem.
2523 */
2524 if (ignore_crossmnt == 0 &&
2525 dentry == exp->ex_path.mnt->mnt_root)
2526 get_parent_attributes(exp, &stat);
2527 p = xdr_encode_hyper(p, stat.ino);
2528 }
2529 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2530 status = nfsd4_encode_security_label(xdr, rqstp, context,
2531 contextlen);
2532 if (status)
2533 goto out;
2534 }
2535 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2536 p = xdr_reserve_space(xdr, 16);
2537 if (!p)
2538 goto out_resource;
2539 *p++ = cpu_to_be32(3);
2540 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2541 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2542 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2543 }
2544
2545 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2546 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2547 status = nfs_ok;
2548
2549 out:
2550 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2551 if (context)
2552 security_release_secctx(context, contextlen);
2553 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2554 kfree(acl);
2555 if (tempfh) {
2556 fh_put(tempfh);
2557 kfree(tempfh);
2558 }
2559 if (status)
2560 xdr_truncate_encode(xdr, starting_len);
2561 return status;
2562 out_nfserr:
2563 status = nfserrno(err);
2564 goto out;
2565 out_resource:
2566 status = nfserr_resource;
2567 goto out;
2568 }
2569
2570 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2571 struct xdr_buf *buf, __be32 *p, int bytes)
2572 {
2573 xdr->scratch.iov_len = 0;
2574 memset(buf, 0, sizeof(struct xdr_buf));
2575 buf->head[0].iov_base = p;
2576 buf->head[0].iov_len = 0;
2577 buf->len = 0;
2578 xdr->buf = buf;
2579 xdr->iov = buf->head;
2580 xdr->p = p;
2581 xdr->end = (void *)p + bytes;
2582 buf->buflen = bytes;
2583 }
2584
2585 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2586 struct svc_fh *fhp, struct svc_export *exp,
2587 struct dentry *dentry, u32 *bmval,
2588 struct svc_rqst *rqstp, int ignore_crossmnt)
2589 {
2590 struct xdr_buf dummy;
2591 struct xdr_stream xdr;
2592 __be32 ret;
2593
2594 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2595 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2596 ignore_crossmnt);
2597 *p = xdr.p;
2598 return ret;
2599 }
2600
2601 static inline int attributes_need_mount(u32 *bmval)
2602 {
2603 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2604 return 1;
2605 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2606 return 1;
2607 return 0;
2608 }
2609
2610 static __be32
2611 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2612 const char *name, int namlen)
2613 {
2614 struct svc_export *exp = cd->rd_fhp->fh_export;
2615 struct dentry *dentry;
2616 __be32 nfserr;
2617 int ignore_crossmnt = 0;
2618
2619 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2620 if (IS_ERR(dentry))
2621 return nfserrno(PTR_ERR(dentry));
2622 if (!dentry->d_inode) {
2623 /*
2624 * nfsd_buffered_readdir drops the i_mutex between
2625 * readdir and calling this callback, leaving a window
2626 * where this directory entry could have gone away.
2627 */
2628 dput(dentry);
2629 return nfserr_noent;
2630 }
2631
2632 exp_get(exp);
2633 /*
2634 * In the case of a mountpoint, the client may be asking for
2635 * attributes that are only properties of the underlying filesystem
2636 * as opposed to the cross-mounted file system. In such a case,
2637 * we will not follow the cross mount and will fill the attribtutes
2638 * directly from the mountpoint dentry.
2639 */
2640 if (nfsd_mountpoint(dentry, exp)) {
2641 int err;
2642
2643 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2644 && !attributes_need_mount(cd->rd_bmval)) {
2645 ignore_crossmnt = 1;
2646 goto out_encode;
2647 }
2648 /*
2649 * Why the heck aren't we just using nfsd_lookup??
2650 * Different "."/".." handling? Something else?
2651 * At least, add a comment here to explain....
2652 */
2653 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2654 if (err) {
2655 nfserr = nfserrno(err);
2656 goto out_put;
2657 }
2658 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2659 if (nfserr)
2660 goto out_put;
2661
2662 }
2663 out_encode:
2664 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2665 cd->rd_rqstp, ignore_crossmnt);
2666 out_put:
2667 dput(dentry);
2668 exp_put(exp);
2669 return nfserr;
2670 }
2671
2672 static __be32 *
2673 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2674 {
2675 __be32 *p;
2676
2677 p = xdr_reserve_space(xdr, 20);
2678 if (!p)
2679 return NULL;
2680 *p++ = htonl(2);
2681 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2682 *p++ = htonl(0); /* bmval1 */
2683
2684 *p++ = htonl(4); /* attribute length */
2685 *p++ = nfserr; /* no htonl */
2686 return p;
2687 }
2688
2689 static int
2690 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2691 loff_t offset, u64 ino, unsigned int d_type)
2692 {
2693 struct readdir_cd *ccd = ccdv;
2694 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2695 struct xdr_stream *xdr = cd->xdr;
2696 int start_offset = xdr->buf->len;
2697 int cookie_offset;
2698 u32 name_and_cookie;
2699 int entry_bytes;
2700 __be32 nfserr = nfserr_toosmall;
2701 __be64 wire_offset;
2702 __be32 *p;
2703
2704 /* In nfsv4, "." and ".." never make it onto the wire.. */
2705 if (name && isdotent(name, namlen)) {
2706 cd->common.err = nfs_ok;
2707 return 0;
2708 }
2709
2710 if (cd->cookie_offset) {
2711 wire_offset = cpu_to_be64(offset);
2712 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2713 &wire_offset, 8);
2714 }
2715
2716 p = xdr_reserve_space(xdr, 4);
2717 if (!p)
2718 goto fail;
2719 *p++ = xdr_one; /* mark entry present */
2720 cookie_offset = xdr->buf->len;
2721 p = xdr_reserve_space(xdr, 3*4 + namlen);
2722 if (!p)
2723 goto fail;
2724 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2725 p = xdr_encode_array(p, name, namlen); /* name length & name */
2726
2727 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2728 switch (nfserr) {
2729 case nfs_ok:
2730 break;
2731 case nfserr_resource:
2732 nfserr = nfserr_toosmall;
2733 goto fail;
2734 case nfserr_noent:
2735 xdr_truncate_encode(xdr, start_offset);
2736 goto skip_entry;
2737 default:
2738 /*
2739 * If the client requested the RDATTR_ERROR attribute,
2740 * we stuff the error code into this attribute
2741 * and continue. If this attribute was not requested,
2742 * then in accordance with the spec, we fail the
2743 * entire READDIR operation(!)
2744 */
2745 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2746 goto fail;
2747 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2748 if (p == NULL) {
2749 nfserr = nfserr_toosmall;
2750 goto fail;
2751 }
2752 }
2753 nfserr = nfserr_toosmall;
2754 entry_bytes = xdr->buf->len - start_offset;
2755 if (entry_bytes > cd->rd_maxcount)
2756 goto fail;
2757 cd->rd_maxcount -= entry_bytes;
2758 if (!cd->rd_dircount)
2759 goto fail;
2760 /*
2761 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2762 * let's always let through the first entry, at least:
2763 */
2764 name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2765 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2766 goto fail;
2767 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2768 cd->cookie_offset = cookie_offset;
2769 skip_entry:
2770 cd->common.err = nfs_ok;
2771 return 0;
2772 fail:
2773 xdr_truncate_encode(xdr, start_offset);
2774 cd->common.err = nfserr;
2775 return -EINVAL;
2776 }
2777
2778 static __be32
2779 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2780 {
2781 __be32 *p;
2782
2783 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2784 if (!p)
2785 return nfserr_resource;
2786 *p++ = cpu_to_be32(sid->si_generation);
2787 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2788 sizeof(stateid_opaque_t));
2789 return 0;
2790 }
2791
2792 static __be32
2793 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2794 {
2795 struct xdr_stream *xdr = &resp->xdr;
2796 __be32 *p;
2797
2798 if (!nfserr) {
2799 p = xdr_reserve_space(xdr, 8);
2800 if (!p)
2801 return nfserr_resource;
2802 *p++ = cpu_to_be32(access->ac_supported);
2803 *p++ = cpu_to_be32(access->ac_resp_access);
2804 }
2805 return nfserr;
2806 }
2807
2808 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2809 {
2810 struct xdr_stream *xdr = &resp->xdr;
2811 __be32 *p;
2812
2813 if (!nfserr) {
2814 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2815 if (!p)
2816 return nfserr_resource;
2817 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2818 NFS4_MAX_SESSIONID_LEN);
2819 *p++ = cpu_to_be32(bcts->dir);
2820 /* Sorry, we do not yet support RDMA over 4.1: */
2821 *p++ = cpu_to_be32(0);
2822 }
2823 return nfserr;
2824 }
2825
2826 static __be32
2827 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2828 {
2829 struct xdr_stream *xdr = &resp->xdr;
2830
2831 if (!nfserr)
2832 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2833
2834 return nfserr;
2835 }
2836
2837
2838 static __be32
2839 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2840 {
2841 struct xdr_stream *xdr = &resp->xdr;
2842 __be32 *p;
2843
2844 if (!nfserr) {
2845 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2846 if (!p)
2847 return nfserr_resource;
2848 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2849 NFS4_VERIFIER_SIZE);
2850 }
2851 return nfserr;
2852 }
2853
2854 static __be32
2855 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2856 {
2857 struct xdr_stream *xdr = &resp->xdr;
2858 __be32 *p;
2859
2860 if (!nfserr) {
2861 p = xdr_reserve_space(xdr, 32);
2862 if (!p)
2863 return nfserr_resource;
2864 p = encode_cinfo(p, &create->cr_cinfo);
2865 *p++ = cpu_to_be32(2);
2866 *p++ = cpu_to_be32(create->cr_bmval[0]);
2867 *p++ = cpu_to_be32(create->cr_bmval[1]);
2868 }
2869 return nfserr;
2870 }
2871
2872 static __be32
2873 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2874 {
2875 struct svc_fh *fhp = getattr->ga_fhp;
2876 struct xdr_stream *xdr = &resp->xdr;
2877
2878 if (nfserr)
2879 return nfserr;
2880
2881 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2882 getattr->ga_bmval,
2883 resp->rqstp, 0);
2884 return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2889 {
2890 struct xdr_stream *xdr = &resp->xdr;
2891 struct svc_fh *fhp = *fhpp;
2892 unsigned int len;
2893 __be32 *p;
2894
2895 if (!nfserr) {
2896 len = fhp->fh_handle.fh_size;
2897 p = xdr_reserve_space(xdr, len + 4);
2898 if (!p)
2899 return nfserr_resource;
2900 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2901 }
2902 return nfserr;
2903 }
2904
2905 /*
2906 * Including all fields other than the name, a LOCK4denied structure requires
2907 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2908 */
2909 static __be32
2910 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2911 {
2912 struct xdr_netobj *conf = &ld->ld_owner;
2913 __be32 *p;
2914
2915 again:
2916 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2917 if (!p) {
2918 /*
2919 * Don't fail to return the result just because we can't
2920 * return the conflicting open:
2921 */
2922 if (conf->len) {
2923 kfree(conf->data);
2924 conf->len = 0;
2925 conf->data = NULL;
2926 goto again;
2927 }
2928 return nfserr_resource;
2929 }
2930 p = xdr_encode_hyper(p, ld->ld_start);
2931 p = xdr_encode_hyper(p, ld->ld_length);
2932 *p++ = cpu_to_be32(ld->ld_type);
2933 if (conf->len) {
2934 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2935 p = xdr_encode_opaque(p, conf->data, conf->len);
2936 kfree(conf->data);
2937 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2938 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2939 *p++ = cpu_to_be32(0); /* length of owner name */
2940 }
2941 return nfserr_denied;
2942 }
2943
2944 static __be32
2945 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2946 {
2947 struct xdr_stream *xdr = &resp->xdr;
2948
2949 if (!nfserr)
2950 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2951 else if (nfserr == nfserr_denied)
2952 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2953
2954 return nfserr;
2955 }
2956
2957 static __be32
2958 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2959 {
2960 struct xdr_stream *xdr = &resp->xdr;
2961
2962 if (nfserr == nfserr_denied)
2963 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2964 return nfserr;
2965 }
2966
2967 static __be32
2968 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2969 {
2970 struct xdr_stream *xdr = &resp->xdr;
2971
2972 if (!nfserr)
2973 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2974
2975 return nfserr;
2976 }
2977
2978
2979 static __be32
2980 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2981 {
2982 struct xdr_stream *xdr = &resp->xdr;
2983 __be32 *p;
2984
2985 if (!nfserr) {
2986 p = xdr_reserve_space(xdr, 20);
2987 if (!p)
2988 return nfserr_resource;
2989 p = encode_cinfo(p, &link->li_cinfo);
2990 }
2991 return nfserr;
2992 }
2993
2994
2995 static __be32
2996 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2997 {
2998 struct xdr_stream *xdr = &resp->xdr;
2999 __be32 *p;
3000
3001 if (nfserr)
3002 goto out;
3003
3004 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3005 if (nfserr)
3006 goto out;
3007 p = xdr_reserve_space(xdr, 40);
3008 if (!p)
3009 return nfserr_resource;
3010 p = encode_cinfo(p, &open->op_cinfo);
3011 *p++ = cpu_to_be32(open->op_rflags);
3012 *p++ = cpu_to_be32(2);
3013 *p++ = cpu_to_be32(open->op_bmval[0]);
3014 *p++ = cpu_to_be32(open->op_bmval[1]);
3015 *p++ = cpu_to_be32(open->op_delegate_type);
3016
3017 switch (open->op_delegate_type) {
3018 case NFS4_OPEN_DELEGATE_NONE:
3019 break;
3020 case NFS4_OPEN_DELEGATE_READ:
3021 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3022 if (nfserr)
3023 return nfserr;
3024 p = xdr_reserve_space(xdr, 20);
3025 if (!p)
3026 return nfserr_resource;
3027 *p++ = cpu_to_be32(open->op_recall);
3028
3029 /*
3030 * TODO: ACE's in delegations
3031 */
3032 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3033 *p++ = cpu_to_be32(0);
3034 *p++ = cpu_to_be32(0);
3035 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3036 break;
3037 case NFS4_OPEN_DELEGATE_WRITE:
3038 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3039 if (nfserr)
3040 return nfserr;
3041 p = xdr_reserve_space(xdr, 32);
3042 if (!p)
3043 return nfserr_resource;
3044 *p++ = cpu_to_be32(0);
3045
3046 /*
3047 * TODO: space_limit's in delegations
3048 */
3049 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3050 *p++ = cpu_to_be32(~(u32)0);
3051 *p++ = cpu_to_be32(~(u32)0);
3052
3053 /*
3054 * TODO: ACE's in delegations
3055 */
3056 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3057 *p++ = cpu_to_be32(0);
3058 *p++ = cpu_to_be32(0);
3059 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3060 break;
3061 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3062 switch (open->op_why_no_deleg) {
3063 case WND4_CONTENTION:
3064 case WND4_RESOURCE:
3065 p = xdr_reserve_space(xdr, 8);
3066 if (!p)
3067 return nfserr_resource;
3068 *p++ = cpu_to_be32(open->op_why_no_deleg);
3069 /* deleg signaling not supported yet: */
3070 *p++ = cpu_to_be32(0);
3071 break;
3072 default:
3073 p = xdr_reserve_space(xdr, 4);
3074 if (!p)
3075 return nfserr_resource;
3076 *p++ = cpu_to_be32(open->op_why_no_deleg);
3077 }
3078 break;
3079 default:
3080 BUG();
3081 }
3082 /* XXX save filehandle here */
3083 out:
3084 return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3089 {
3090 struct xdr_stream *xdr = &resp->xdr;
3091
3092 if (!nfserr)
3093 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3094
3095 return nfserr;
3096 }
3097
3098 static __be32
3099 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3100 {
3101 struct xdr_stream *xdr = &resp->xdr;
3102
3103 if (!nfserr)
3104 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3105
3106 return nfserr;
3107 }
3108
3109 static __be32 nfsd4_encode_splice_read(
3110 struct nfsd4_compoundres *resp,
3111 struct nfsd4_read *read,
3112 struct file *file, unsigned long maxcount)
3113 {
3114 struct xdr_stream *xdr = &resp->xdr;
3115 struct xdr_buf *buf = xdr->buf;
3116 u32 eof;
3117 int space_left;
3118 __be32 nfserr;
3119 __be32 *p = xdr->p - 2;
3120
3121 /* Make sure there will be room for padding if needed */
3122 if (xdr->end - xdr->p < 1)
3123 return nfserr_resource;
3124
3125 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3126 read->rd_offset, &maxcount);
3127 if (nfserr) {
3128 /*
3129 * nfsd_splice_actor may have already messed with the
3130 * page length; reset it so as not to confuse
3131 * xdr_truncate_encode:
3132 */
3133 buf->page_len = 0;
3134 return nfserr;
3135 }
3136
3137 eof = (read->rd_offset + maxcount >=
3138 read->rd_fhp->fh_dentry->d_inode->i_size);
3139
3140 *(p++) = htonl(eof);
3141 *(p++) = htonl(maxcount);
3142
3143 buf->page_len = maxcount;
3144 buf->len += maxcount;
3145 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3146 / PAGE_SIZE;
3147
3148 /* Use rest of head for padding and remaining ops: */
3149 buf->tail[0].iov_base = xdr->p;
3150 buf->tail[0].iov_len = 0;
3151 xdr->iov = buf->tail;
3152 if (maxcount&3) {
3153 int pad = 4 - (maxcount&3);
3154
3155 *(xdr->p++) = 0;
3156
3157 buf->tail[0].iov_base += maxcount&3;
3158 buf->tail[0].iov_len = pad;
3159 buf->len += pad;
3160 }
3161
3162 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3163 buf->buflen - buf->len);
3164 buf->buflen = buf->len + space_left;
3165 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3166
3167 return 0;
3168 }
3169
3170 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3171 struct nfsd4_read *read,
3172 struct file *file, unsigned long maxcount)
3173 {
3174 struct xdr_stream *xdr = &resp->xdr;
3175 u32 eof;
3176 int v;
3177 int starting_len = xdr->buf->len - 8;
3178 long len;
3179 int thislen;
3180 __be32 nfserr;
3181 __be32 tmp;
3182 __be32 *p;
3183 u32 zzz = 0;
3184 int pad;
3185
3186 len = maxcount;
3187 v = 0;
3188
3189 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3190 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3191 WARN_ON_ONCE(!p);
3192 resp->rqstp->rq_vec[v].iov_base = p;
3193 resp->rqstp->rq_vec[v].iov_len = thislen;
3194 v++;
3195 len -= thislen;
3196
3197 while (len) {
3198 thislen = min_t(long, len, PAGE_SIZE);
3199 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3200 WARN_ON_ONCE(!p);
3201 resp->rqstp->rq_vec[v].iov_base = p;
3202 resp->rqstp->rq_vec[v].iov_len = thislen;
3203 v++;
3204 len -= thislen;
3205 }
3206 read->rd_vlen = v;
3207
3208 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3209 read->rd_vlen, &maxcount);
3210 if (nfserr)
3211 return nfserr;
3212 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3213
3214 eof = (read->rd_offset + maxcount >=
3215 read->rd_fhp->fh_dentry->d_inode->i_size);
3216
3217 tmp = htonl(eof);
3218 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3219 tmp = htonl(maxcount);
3220 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3221
3222 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3223 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3224 &zzz, pad);
3225 return 0;
3226
3227 }
3228
3229 static __be32
3230 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3231 struct nfsd4_read *read)
3232 {
3233 unsigned long maxcount;
3234 struct xdr_stream *xdr = &resp->xdr;
3235 struct file *file = read->rd_filp;
3236 struct svc_fh *fhp = read->rd_fhp;
3237 int starting_len = xdr->buf->len;
3238 struct raparms *ra;
3239 __be32 *p;
3240 __be32 err;
3241
3242 if (nfserr)
3243 return nfserr;
3244
3245 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3246 if (!p) {
3247 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3248 return nfserr_resource;
3249 }
3250 if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3251 WARN_ON_ONCE(1);
3252 return nfserr_resource;
3253 }
3254 xdr_commit_encode(xdr);
3255
3256 maxcount = svc_max_payload(resp->rqstp);
3257 maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3258 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3259
3260 if (read->rd_filp)
3261 err = nfsd_permission(resp->rqstp, fhp->fh_export,
3262 fhp->fh_dentry,
3263 NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
3264 else
3265 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3266 &file, &ra);
3267 if (err)
3268 goto err_truncate;
3269
3270 if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3271 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3272 else
3273 err = nfsd4_encode_readv(resp, read, file, maxcount);
3274
3275 if (!read->rd_filp)
3276 nfsd_put_tmp_read_open(file, ra);
3277
3278 err_truncate:
3279 if (err)
3280 xdr_truncate_encode(xdr, starting_len);
3281 return err;
3282 }
3283
3284 static __be32
3285 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3286 {
3287 int maxcount;
3288 __be32 wire_count;
3289 int zero = 0;
3290 struct xdr_stream *xdr = &resp->xdr;
3291 int length_offset = xdr->buf->len;
3292 __be32 *p;
3293
3294 if (nfserr)
3295 return nfserr;
3296
3297 p = xdr_reserve_space(xdr, 4);
3298 if (!p)
3299 return nfserr_resource;
3300 maxcount = PAGE_SIZE;
3301
3302 p = xdr_reserve_space(xdr, maxcount);
3303 if (!p)
3304 return nfserr_resource;
3305 /*
3306 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3307 * if they would overflow the buffer. Is this kosher in NFSv4? If
3308 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3309 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3310 */
3311 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3312 (char *)p, &maxcount);
3313 if (nfserr == nfserr_isdir)
3314 nfserr = nfserr_inval;
3315 if (nfserr) {
3316 xdr_truncate_encode(xdr, length_offset);
3317 return nfserr;
3318 }
3319
3320 wire_count = htonl(maxcount);
3321 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3322 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3323 if (maxcount & 3)
3324 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3325 &zero, 4 - (maxcount&3));
3326 return 0;
3327 }
3328
3329 static __be32
3330 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3331 {
3332 int maxcount;
3333 int bytes_left;
3334 loff_t offset;
3335 __be64 wire_offset;
3336 struct xdr_stream *xdr = &resp->xdr;
3337 int starting_len = xdr->buf->len;
3338 __be32 *p;
3339
3340 if (nfserr)
3341 return nfserr;
3342
3343 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3344 if (!p)
3345 return nfserr_resource;
3346
3347 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3348 *p++ = cpu_to_be32(0);
3349 *p++ = cpu_to_be32(0);
3350 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3351 - (char *)resp->xdr.buf->head[0].iov_base;
3352
3353 /*
3354 * Number of bytes left for directory entries allowing for the
3355 * final 8 bytes of the readdir and a following failed op:
3356 */
3357 bytes_left = xdr->buf->buflen - xdr->buf->len
3358 - COMPOUND_ERR_SLACK_SPACE - 8;
3359 if (bytes_left < 0) {
3360 nfserr = nfserr_resource;
3361 goto err_no_verf;
3362 }
3363 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3364 /*
3365 * Note the rfc defines rd_maxcount as the size of the
3366 * READDIR4resok structure, which includes the verifier above
3367 * and the 8 bytes encoded at the end of this function:
3368 */
3369 if (maxcount < 16) {
3370 nfserr = nfserr_toosmall;
3371 goto err_no_verf;
3372 }
3373 maxcount = min_t(int, maxcount-16, bytes_left);
3374
3375 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3376 if (!readdir->rd_dircount)
3377 readdir->rd_dircount = INT_MAX;
3378
3379 readdir->xdr = xdr;
3380 readdir->rd_maxcount = maxcount;
3381 readdir->common.err = 0;
3382 readdir->cookie_offset = 0;
3383
3384 offset = readdir->rd_cookie;
3385 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3386 &offset,
3387 &readdir->common, nfsd4_encode_dirent);
3388 if (nfserr == nfs_ok &&
3389 readdir->common.err == nfserr_toosmall &&
3390 xdr->buf->len == starting_len + 8) {
3391 /* nothing encoded; which limit did we hit?: */
3392 if (maxcount - 16 < bytes_left)
3393 /* It was the fault of rd_maxcount: */
3394 nfserr = nfserr_toosmall;
3395 else
3396 /* We ran out of buffer space: */
3397 nfserr = nfserr_resource;
3398 }
3399 if (nfserr)
3400 goto err_no_verf;
3401
3402 if (readdir->cookie_offset) {
3403 wire_offset = cpu_to_be64(offset);
3404 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3405 &wire_offset, 8);
3406 }
3407
3408 p = xdr_reserve_space(xdr, 8);
3409 if (!p) {
3410 WARN_ON_ONCE(1);
3411 goto err_no_verf;
3412 }
3413 *p++ = 0; /* no more entries */
3414 *p++ = htonl(readdir->common.err == nfserr_eof);
3415
3416 return 0;
3417 err_no_verf:
3418 xdr_truncate_encode(xdr, starting_len);
3419 return nfserr;
3420 }
3421
3422 static __be32
3423 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3424 {
3425 struct xdr_stream *xdr = &resp->xdr;
3426 __be32 *p;
3427
3428 if (!nfserr) {
3429 p = xdr_reserve_space(xdr, 20);
3430 if (!p)
3431 return nfserr_resource;
3432 p = encode_cinfo(p, &remove->rm_cinfo);
3433 }
3434 return nfserr;
3435 }
3436
3437 static __be32
3438 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3439 {
3440 struct xdr_stream *xdr = &resp->xdr;
3441 __be32 *p;
3442
3443 if (!nfserr) {
3444 p = xdr_reserve_space(xdr, 40);
3445 if (!p)
3446 return nfserr_resource;
3447 p = encode_cinfo(p, &rename->rn_sinfo);
3448 p = encode_cinfo(p, &rename->rn_tinfo);
3449 }
3450 return nfserr;
3451 }
3452
3453 static __be32
3454 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3455 __be32 nfserr, struct svc_export *exp)
3456 {
3457 u32 i, nflavs, supported;
3458 struct exp_flavor_info *flavs;
3459 struct exp_flavor_info def_flavs[2];
3460 __be32 *p, *flavorsp;
3461 static bool report = true;
3462
3463 if (nfserr)
3464 goto out;
3465 nfserr = nfserr_resource;
3466 if (exp->ex_nflavors) {
3467 flavs = exp->ex_flavors;
3468 nflavs = exp->ex_nflavors;
3469 } else { /* Handling of some defaults in absence of real secinfo: */
3470 flavs = def_flavs;
3471 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3472 nflavs = 2;
3473 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3474 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3475 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3476 nflavs = 1;
3477 flavs[0].pseudoflavor
3478 = svcauth_gss_flavor(exp->ex_client);
3479 } else {
3480 nflavs = 1;
3481 flavs[0].pseudoflavor
3482 = exp->ex_client->flavour->flavour;
3483 }
3484 }
3485
3486 supported = 0;
3487 p = xdr_reserve_space(xdr, 4);
3488 if (!p)
3489 goto out;
3490 flavorsp = p++; /* to be backfilled later */
3491
3492 for (i = 0; i < nflavs; i++) {
3493 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3494 struct rpcsec_gss_info info;
3495
3496 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3497 supported++;
3498 p = xdr_reserve_space(xdr, 4 + 4 +
3499 XDR_LEN(info.oid.len) + 4 + 4);
3500 if (!p)
3501 goto out;
3502 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3503 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3504 *p++ = cpu_to_be32(info.qop);
3505 *p++ = cpu_to_be32(info.service);
3506 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3507 supported++;
3508 p = xdr_reserve_space(xdr, 4);
3509 if (!p)
3510 goto out;
3511 *p++ = cpu_to_be32(pf);
3512 } else {
3513 if (report)
3514 pr_warn("NFS: SECINFO: security flavor %u "
3515 "is not supported\n", pf);
3516 }
3517 }
3518
3519 if (nflavs != supported)
3520 report = false;
3521 *flavorsp = htonl(supported);
3522 nfserr = 0;
3523 out:
3524 if (exp)
3525 exp_put(exp);
3526 return nfserr;
3527 }
3528
3529 static __be32
3530 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3531 struct nfsd4_secinfo *secinfo)
3532 {
3533 struct xdr_stream *xdr = &resp->xdr;
3534
3535 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3536 }
3537
3538 static __be32
3539 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3540 struct nfsd4_secinfo_no_name *secinfo)
3541 {
3542 struct xdr_stream *xdr = &resp->xdr;
3543
3544 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3545 }
3546
3547 /*
3548 * The SETATTR encode routine is special -- it always encodes a bitmap,
3549 * regardless of the error status.
3550 */
3551 static __be32
3552 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3553 {
3554 struct xdr_stream *xdr = &resp->xdr;
3555 __be32 *p;
3556
3557 p = xdr_reserve_space(xdr, 16);
3558 if (!p)
3559 return nfserr_resource;
3560 if (nfserr) {
3561 *p++ = cpu_to_be32(3);
3562 *p++ = cpu_to_be32(0);
3563 *p++ = cpu_to_be32(0);
3564 *p++ = cpu_to_be32(0);
3565 }
3566 else {
3567 *p++ = cpu_to_be32(3);
3568 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3569 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3570 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3571 }
3572 return nfserr;
3573 }
3574
3575 static __be32
3576 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3577 {
3578 struct xdr_stream *xdr = &resp->xdr;
3579 __be32 *p;
3580
3581 if (!nfserr) {
3582 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3583 if (!p)
3584 return nfserr_resource;
3585 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3586 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3587 NFS4_VERIFIER_SIZE);
3588 }
3589 else if (nfserr == nfserr_clid_inuse) {
3590 p = xdr_reserve_space(xdr, 8);
3591 if (!p)
3592 return nfserr_resource;
3593 *p++ = cpu_to_be32(0);
3594 *p++ = cpu_to_be32(0);
3595 }
3596 return nfserr;
3597 }
3598
3599 static __be32
3600 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3601 {
3602 struct xdr_stream *xdr = &resp->xdr;
3603 __be32 *p;
3604
3605 if (!nfserr) {
3606 p = xdr_reserve_space(xdr, 16);
3607 if (!p)
3608 return nfserr_resource;
3609 *p++ = cpu_to_be32(write->wr_bytes_written);
3610 *p++ = cpu_to_be32(write->wr_how_written);
3611 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3612 NFS4_VERIFIER_SIZE);
3613 }
3614 return nfserr;
3615 }
3616
3617 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3618 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3619 1 << (OP_EXCHANGE_ID - 32) |
3620 1 << (OP_CREATE_SESSION - 32) |
3621 1 << (OP_DESTROY_SESSION - 32) |
3622 1 << (OP_DESTROY_CLIENTID - 32)
3623 };
3624
3625 static __be32
3626 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3627 struct nfsd4_exchange_id *exid)
3628 {
3629 struct xdr_stream *xdr = &resp->xdr;
3630 __be32 *p;
3631 char *major_id;
3632 char *server_scope;
3633 int major_id_sz;
3634 int server_scope_sz;
3635 uint64_t minor_id = 0;
3636
3637 if (nfserr)
3638 return nfserr;
3639
3640 major_id = utsname()->nodename;
3641 major_id_sz = strlen(major_id);
3642 server_scope = utsname()->nodename;
3643 server_scope_sz = strlen(server_scope);
3644
3645 p = xdr_reserve_space(xdr,
3646 8 /* eir_clientid */ +
3647 4 /* eir_sequenceid */ +
3648 4 /* eir_flags */ +
3649 4 /* spr_how */);
3650 if (!p)
3651 return nfserr_resource;
3652
3653 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3654 *p++ = cpu_to_be32(exid->seqid);
3655 *p++ = cpu_to_be32(exid->flags);
3656
3657 *p++ = cpu_to_be32(exid->spa_how);
3658
3659 switch (exid->spa_how) {
3660 case SP4_NONE:
3661 break;
3662 case SP4_MACH_CRED:
3663 /* spo_must_enforce, spo_must_allow */
3664 p = xdr_reserve_space(xdr, 16);
3665 if (!p)
3666 return nfserr_resource;
3667
3668 /* spo_must_enforce bitmap: */
3669 *p++ = cpu_to_be32(2);
3670 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3671 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3672 /* empty spo_must_allow bitmap: */
3673 *p++ = cpu_to_be32(0);
3674
3675 break;
3676 default:
3677 WARN_ON_ONCE(1);
3678 }
3679
3680 p = xdr_reserve_space(xdr,
3681 8 /* so_minor_id */ +
3682 4 /* so_major_id.len */ +
3683 (XDR_QUADLEN(major_id_sz) * 4) +
3684 4 /* eir_server_scope.len */ +
3685 (XDR_QUADLEN(server_scope_sz) * 4) +
3686 4 /* eir_server_impl_id.count (0) */);
3687 if (!p)
3688 return nfserr_resource;
3689
3690 /* The server_owner struct */
3691 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3692 /* major id */
3693 p = xdr_encode_opaque(p, major_id, major_id_sz);
3694
3695 /* Server scope */
3696 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3697
3698 /* Implementation id */
3699 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3700 return 0;
3701 }
3702
3703 static __be32
3704 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3705 struct nfsd4_create_session *sess)
3706 {
3707 struct xdr_stream *xdr = &resp->xdr;
3708 __be32 *p;
3709
3710 if (nfserr)
3711 return nfserr;
3712
3713 p = xdr_reserve_space(xdr, 24);
3714 if (!p)
3715 return nfserr_resource;
3716 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3717 NFS4_MAX_SESSIONID_LEN);
3718 *p++ = cpu_to_be32(sess->seqid);
3719 *p++ = cpu_to_be32(sess->flags);
3720
3721 p = xdr_reserve_space(xdr, 28);
3722 if (!p)
3723 return nfserr_resource;
3724 *p++ = cpu_to_be32(0); /* headerpadsz */
3725 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3726 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3727 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3728 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3729 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3730 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3731
3732 if (sess->fore_channel.nr_rdma_attrs) {
3733 p = xdr_reserve_space(xdr, 4);
3734 if (!p)
3735 return nfserr_resource;
3736 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3737 }
3738
3739 p = xdr_reserve_space(xdr, 28);
3740 if (!p)
3741 return nfserr_resource;
3742 *p++ = cpu_to_be32(0); /* headerpadsz */
3743 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3744 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3745 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3746 *p++ = cpu_to_be32(sess->back_channel.maxops);
3747 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3748 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3749
3750 if (sess->back_channel.nr_rdma_attrs) {
3751 p = xdr_reserve_space(xdr, 4);
3752 if (!p)
3753 return nfserr_resource;
3754 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3755 }
3756 return 0;
3757 }
3758
3759 static __be32
3760 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3761 struct nfsd4_sequence *seq)
3762 {
3763 struct xdr_stream *xdr = &resp->xdr;
3764 __be32 *p;
3765
3766 if (nfserr)
3767 return nfserr;
3768
3769 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3770 if (!p)
3771 return nfserr_resource;
3772 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3773 NFS4_MAX_SESSIONID_LEN);
3774 *p++ = cpu_to_be32(seq->seqid);
3775 *p++ = cpu_to_be32(seq->slotid);
3776 /* Note slotid's are numbered from zero: */
3777 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3778 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3779 *p++ = cpu_to_be32(seq->status_flags);
3780
3781 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3782 return 0;
3783 }
3784
3785 static __be32
3786 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3787 struct nfsd4_test_stateid *test_stateid)
3788 {
3789 struct xdr_stream *xdr = &resp->xdr;
3790 struct nfsd4_test_stateid_id *stateid, *next;
3791 __be32 *p;
3792
3793 if (nfserr)
3794 return nfserr;
3795
3796 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3797 if (!p)
3798 return nfserr_resource;
3799 *p++ = htonl(test_stateid->ts_num_ids);
3800
3801 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3802 *p++ = stateid->ts_id_status;
3803 }
3804
3805 return nfserr;
3806 }
3807
3808 static __be32
3809 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3810 struct nfsd4_seek *seek)
3811 {
3812 __be32 *p;
3813
3814 if (nfserr)
3815 return nfserr;
3816
3817 p = xdr_reserve_space(&resp->xdr, 4 + 8);
3818 *p++ = cpu_to_be32(seek->seek_eof);
3819 p = xdr_encode_hyper(p, seek->seek_pos);
3820
3821 return nfserr;
3822 }
3823
3824 static __be32
3825 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3826 {
3827 return nfserr;
3828 }
3829
3830 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3831
3832 /*
3833 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3834 * since we don't need to filter out obsolete ops as this is
3835 * done in the decoding phase.
3836 */
3837 static nfsd4_enc nfsd4_enc_ops[] = {
3838 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3839 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3840 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3841 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3842 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3843 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3844 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3845 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3846 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3847 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3848 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3849 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3850 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3851 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3852 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3853 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3854 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3855 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3856 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3857 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3858 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3859 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3860 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3861 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3862 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3863 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3864 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3865 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3866 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3867 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3868 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3869 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3870 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3871 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3872 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3873 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3874 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3875
3876 /* NFSv4.1 operations */
3877 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3878 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3879 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3880 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3881 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3882 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3883 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3884 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3885 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3886 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3887 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3888 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3889 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3890 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3891 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3892 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3893 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3894 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3895 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3896
3897 /* NFSv4.2 operations */
3898 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3899 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
3900 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
3901 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3902 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
3903 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
3904 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
3905 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
3906 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
3907 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
3908 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
3909 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
3910 };
3911
3912 /*
3913 * Calculate whether we still have space to encode repsize bytes.
3914 * There are two considerations:
3915 * - For NFS versions >=4.1, the size of the reply must stay within
3916 * session limits
3917 * - For all NFS versions, we must stay within limited preallocated
3918 * buffer space.
3919 *
3920 * This is called before the operation is processed, so can only provide
3921 * an upper estimate. For some nonidempotent operations (such as
3922 * getattr), it's not necessarily a problem if that estimate is wrong,
3923 * as we can fail it after processing without significant side effects.
3924 */
3925 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3926 {
3927 struct xdr_buf *buf = &resp->rqstp->rq_res;
3928 struct nfsd4_slot *slot = resp->cstate.slot;
3929
3930 if (buf->len + respsize <= buf->buflen)
3931 return nfs_ok;
3932 if (!nfsd4_has_session(&resp->cstate))
3933 return nfserr_resource;
3934 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3935 WARN_ON_ONCE(1);
3936 return nfserr_rep_too_big_to_cache;
3937 }
3938 return nfserr_rep_too_big;
3939 }
3940
3941 void
3942 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3943 {
3944 struct xdr_stream *xdr = &resp->xdr;
3945 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3946 struct svc_rqst *rqstp = resp->rqstp;
3947 int post_err_offset;
3948 nfsd4_enc encoder;
3949 __be32 *p;
3950
3951 p = xdr_reserve_space(xdr, 8);
3952 if (!p) {
3953 WARN_ON_ONCE(1);
3954 return;
3955 }
3956 *p++ = cpu_to_be32(op->opnum);
3957 post_err_offset = xdr->buf->len;
3958
3959 if (op->opnum == OP_ILLEGAL)
3960 goto status;
3961 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3962 !nfsd4_enc_ops[op->opnum]);
3963 encoder = nfsd4_enc_ops[op->opnum];
3964 op->status = encoder(resp, op->status, &op->u);
3965 xdr_commit_encode(xdr);
3966
3967 /* nfsd4_check_resp_size guarantees enough room for error status */
3968 if (!op->status) {
3969 int space_needed = 0;
3970 if (!nfsd4_last_compound_op(rqstp))
3971 space_needed = COMPOUND_ERR_SLACK_SPACE;
3972 op->status = nfsd4_check_resp_size(resp, space_needed);
3973 }
3974 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3975 struct nfsd4_slot *slot = resp->cstate.slot;
3976
3977 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3978 op->status = nfserr_rep_too_big_to_cache;
3979 else
3980 op->status = nfserr_rep_too_big;
3981 }
3982 if (op->status == nfserr_resource ||
3983 op->status == nfserr_rep_too_big ||
3984 op->status == nfserr_rep_too_big_to_cache) {
3985 /*
3986 * The operation may have already been encoded or
3987 * partially encoded. No op returns anything additional
3988 * in the case of one of these three errors, so we can
3989 * just truncate back to after the status. But it's a
3990 * bug if we had to do this on a non-idempotent op:
3991 */
3992 warn_on_nonidempotent_op(op);
3993 xdr_truncate_encode(xdr, post_err_offset);
3994 }
3995 if (so) {
3996 int len = xdr->buf->len - post_err_offset;
3997
3998 so->so_replay.rp_status = op->status;
3999 so->so_replay.rp_buflen = len;
4000 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4001 so->so_replay.rp_buf, len);
4002 }
4003 status:
4004 /* Note that op->status is already in network byte order: */
4005 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4006 }
4007
4008 /*
4009 * Encode the reply stored in the stateowner reply cache
4010 *
4011 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4012 * previously sent already encoded operation.
4013 */
4014 void
4015 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4016 {
4017 __be32 *p;
4018 struct nfs4_replay *rp = op->replay;
4019
4020 BUG_ON(!rp);
4021
4022 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4023 if (!p) {
4024 WARN_ON_ONCE(1);
4025 return;
4026 }
4027 *p++ = cpu_to_be32(op->opnum);
4028 *p++ = rp->rp_status; /* already xdr'ed */
4029
4030 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4031 }
4032
4033 int
4034 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4035 {
4036 return xdr_ressize_check(rqstp, p);
4037 }
4038
4039 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4040 {
4041 struct svc_rqst *rqstp = rq;
4042 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4043
4044 if (args->ops != args->iops) {
4045 kfree(args->ops);
4046 args->ops = args->iops;
4047 }
4048 kfree(args->tmpp);
4049 args->tmpp = NULL;
4050 while (args->to_free) {
4051 struct svcxdr_tmpbuf *tb = args->to_free;
4052 args->to_free = tb->next;
4053 kfree(tb);
4054 }
4055 return 1;
4056 }
4057
4058 int
4059 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4060 {
4061 if (rqstp->rq_arg.head[0].iov_len % 4) {
4062 /* client is nuts */
4063 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4064 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4065 return 0;
4066 }
4067 args->p = p;
4068 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4069 args->pagelist = rqstp->rq_arg.pages;
4070 args->pagelen = rqstp->rq_arg.page_len;
4071 args->tmpp = NULL;
4072 args->to_free = NULL;
4073 args->ops = args->iops;
4074 args->rqstp = rqstp;
4075
4076 return !nfsd4_decode_compound(args);
4077 }
4078
4079 int
4080 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4081 {
4082 /*
4083 * All that remains is to write the tag and operation count...
4084 */
4085 struct xdr_buf *buf = resp->xdr.buf;
4086
4087 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4088 buf->tail[0].iov_len);
4089
4090 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4091
4092 p = resp->tagp;
4093 *p++ = htonl(resp->taglen);
4094 memcpy(p, resp->tag, resp->taglen);
4095 p += XDR_QUADLEN(resp->taglen);
4096 *p++ = htonl(resp->opcnt);
4097
4098 nfsd4_sequence_done(resp);
4099 return 1;
4100 }
4101
4102 /*
4103 * Local variables:
4104 * c-basic-offset: 8
4105 * End:
4106 */
Linux with added FPC-III support