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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[mirror_ubuntu-bionic-kernel.git] / fs / nfsd / nfs4xdr.c
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 + 4);
1065 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1066 rename->rn_tnamelen = be32_to_cpup(p++);
1067 READ_BUF(rename->rn_tnamelen);
1068 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1069 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1070 return status;
1071 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1072 return status;
1073
1074 DECODE_TAIL;
1075 }
1076
1077 static __be32
1078 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1079 {
1080 DECODE_HEAD;
1081
1082 if (argp->minorversion >= 1)
1083 return nfserr_notsupp;
1084
1085 READ_BUF(sizeof(clientid_t));
1086 COPYMEM(clientid, sizeof(clientid_t));
1087
1088 DECODE_TAIL;
1089 }
1090
1091 static __be32
1092 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1093 struct nfsd4_secinfo *secinfo)
1094 {
1095 DECODE_HEAD;
1096
1097 READ_BUF(4);
1098 secinfo->si_namelen = be32_to_cpup(p++);
1099 READ_BUF(secinfo->si_namelen);
1100 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1101 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1102 if (status)
1103 return status;
1104 DECODE_TAIL;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1109 struct nfsd4_secinfo_no_name *sin)
1110 {
1111 DECODE_HEAD;
1112
1113 READ_BUF(4);
1114 sin->sin_style = be32_to_cpup(p++);
1115 DECODE_TAIL;
1116 }
1117
1118 static __be32
1119 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1120 {
1121 __be32 status;
1122
1123 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1124 if (status)
1125 return status;
1126 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1127 &setattr->sa_acl, &setattr->sa_label);
1128 }
1129
1130 static __be32
1131 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1132 {
1133 DECODE_HEAD;
1134
1135 if (argp->minorversion >= 1)
1136 return nfserr_notsupp;
1137
1138 READ_BUF(NFS4_VERIFIER_SIZE);
1139 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1140
1141 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1142 if (status)
1143 return nfserr_bad_xdr;
1144 READ_BUF(8);
1145 setclientid->se_callback_prog = be32_to_cpup(p++);
1146 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1147
1148 READ_BUF(setclientid->se_callback_netid_len + 4);
1149 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1150 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1151
1152 READ_BUF(setclientid->se_callback_addr_len + 4);
1153 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1154 setclientid->se_callback_ident = be32_to_cpup(p++);
1155
1156 DECODE_TAIL;
1157 }
1158
1159 static __be32
1160 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1161 {
1162 DECODE_HEAD;
1163
1164 if (argp->minorversion >= 1)
1165 return nfserr_notsupp;
1166
1167 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1168 COPYMEM(&scd_c->sc_clientid, 8);
1169 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1170
1171 DECODE_TAIL;
1172 }
1173
1174 /* Also used for NVERIFY */
1175 static __be32
1176 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1177 {
1178 DECODE_HEAD;
1179
1180 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1181 goto out;
1182
1183 /* For convenience's sake, we compare raw xdr'd attributes in
1184 * nfsd4_proc_verify */
1185
1186 READ_BUF(4);
1187 verify->ve_attrlen = be32_to_cpup(p++);
1188 READ_BUF(verify->ve_attrlen);
1189 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1190
1191 DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1196 {
1197 int avail;
1198 int len;
1199 DECODE_HEAD;
1200
1201 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1202 if (status)
1203 return status;
1204 READ_BUF(16);
1205 p = xdr_decode_hyper(p, &write->wr_offset);
1206 write->wr_stable_how = be32_to_cpup(p++);
1207 if (write->wr_stable_how > 2)
1208 goto xdr_error;
1209 write->wr_buflen = be32_to_cpup(p++);
1210
1211 /* Sorry .. no magic macros for this.. *
1212 * READ_BUF(write->wr_buflen);
1213 * SAVEMEM(write->wr_buf, write->wr_buflen);
1214 */
1215 avail = (char*)argp->end - (char*)argp->p;
1216 if (avail + argp->pagelen < write->wr_buflen) {
1217 dprintk("NFSD: xdr error (%s:%d)\n",
1218 __FILE__, __LINE__);
1219 goto xdr_error;
1220 }
1221 write->wr_head.iov_base = p;
1222 write->wr_head.iov_len = avail;
1223 write->wr_pagelist = argp->pagelist;
1224
1225 len = XDR_QUADLEN(write->wr_buflen) << 2;
1226 if (len >= avail) {
1227 int pages;
1228
1229 len -= avail;
1230
1231 pages = len >> PAGE_SHIFT;
1232 argp->pagelist += pages;
1233 argp->pagelen -= pages * PAGE_SIZE;
1234 len -= pages * PAGE_SIZE;
1235
1236 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1237 argp->pagelist++;
1238 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1239 }
1240 argp->p += XDR_QUADLEN(len);
1241
1242 DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1247 {
1248 DECODE_HEAD;
1249
1250 if (argp->minorversion >= 1)
1251 return nfserr_notsupp;
1252
1253 READ_BUF(12);
1254 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1255 rlockowner->rl_owner.len = be32_to_cpup(p++);
1256 READ_BUF(rlockowner->rl_owner.len);
1257 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1258
1259 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1260 return nfserr_inval;
1261 DECODE_TAIL;
1262 }
1263
1264 static __be32
1265 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1266 struct nfsd4_exchange_id *exid)
1267 {
1268 int dummy, tmp;
1269 DECODE_HEAD;
1270
1271 READ_BUF(NFS4_VERIFIER_SIZE);
1272 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1273
1274 status = nfsd4_decode_opaque(argp, &exid->clname);
1275 if (status)
1276 return nfserr_bad_xdr;
1277
1278 READ_BUF(4);
1279 exid->flags = be32_to_cpup(p++);
1280
1281 /* Ignore state_protect4_a */
1282 READ_BUF(4);
1283 exid->spa_how = be32_to_cpup(p++);
1284 switch (exid->spa_how) {
1285 case SP4_NONE:
1286 break;
1287 case SP4_MACH_CRED:
1288 /* spo_must_enforce */
1289 READ_BUF(4);
1290 dummy = be32_to_cpup(p++);
1291 READ_BUF(dummy * 4);
1292 p += dummy;
1293
1294 /* spo_must_allow */
1295 READ_BUF(4);
1296 dummy = be32_to_cpup(p++);
1297 READ_BUF(dummy * 4);
1298 p += dummy;
1299 break;
1300 case SP4_SSV:
1301 /* ssp_ops */
1302 READ_BUF(4);
1303 dummy = be32_to_cpup(p++);
1304 READ_BUF(dummy * 4);
1305 p += dummy;
1306
1307 READ_BUF(4);
1308 dummy = be32_to_cpup(p++);
1309 READ_BUF(dummy * 4);
1310 p += dummy;
1311
1312 /* ssp_hash_algs<> */
1313 READ_BUF(4);
1314 tmp = be32_to_cpup(p++);
1315 while (tmp--) {
1316 READ_BUF(4);
1317 dummy = be32_to_cpup(p++);
1318 READ_BUF(dummy);
1319 p += XDR_QUADLEN(dummy);
1320 }
1321
1322 /* ssp_encr_algs<> */
1323 READ_BUF(4);
1324 tmp = be32_to_cpup(p++);
1325 while (tmp--) {
1326 READ_BUF(4);
1327 dummy = be32_to_cpup(p++);
1328 READ_BUF(dummy);
1329 p += XDR_QUADLEN(dummy);
1330 }
1331
1332 /* ssp_window and ssp_num_gss_handles */
1333 READ_BUF(8);
1334 dummy = be32_to_cpup(p++);
1335 dummy = be32_to_cpup(p++);
1336 break;
1337 default:
1338 goto xdr_error;
1339 }
1340
1341 /* Ignore Implementation ID */
1342 READ_BUF(4); /* nfs_impl_id4 array length */
1343 dummy = be32_to_cpup(p++);
1344
1345 if (dummy > 1)
1346 goto xdr_error;
1347
1348 if (dummy == 1) {
1349 /* nii_domain */
1350 READ_BUF(4);
1351 dummy = be32_to_cpup(p++);
1352 READ_BUF(dummy);
1353 p += XDR_QUADLEN(dummy);
1354
1355 /* nii_name */
1356 READ_BUF(4);
1357 dummy = be32_to_cpup(p++);
1358 READ_BUF(dummy);
1359 p += XDR_QUADLEN(dummy);
1360
1361 /* nii_date */
1362 READ_BUF(12);
1363 p += 3;
1364 }
1365 DECODE_TAIL;
1366 }
1367
1368 static __be32
1369 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1370 struct nfsd4_create_session *sess)
1371 {
1372 DECODE_HEAD;
1373 u32 dummy;
1374
1375 READ_BUF(16);
1376 COPYMEM(&sess->clientid, 8);
1377 sess->seqid = be32_to_cpup(p++);
1378 sess->flags = be32_to_cpup(p++);
1379
1380 /* Fore channel attrs */
1381 READ_BUF(28);
1382 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1383 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1384 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1385 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1386 sess->fore_channel.maxops = be32_to_cpup(p++);
1387 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1388 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1389 if (sess->fore_channel.nr_rdma_attrs == 1) {
1390 READ_BUF(4);
1391 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1392 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1393 dprintk("Too many fore channel attr bitmaps!\n");
1394 goto xdr_error;
1395 }
1396
1397 /* Back channel attrs */
1398 READ_BUF(28);
1399 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1400 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1401 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1402 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1403 sess->back_channel.maxops = be32_to_cpup(p++);
1404 sess->back_channel.maxreqs = be32_to_cpup(p++);
1405 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1406 if (sess->back_channel.nr_rdma_attrs == 1) {
1407 READ_BUF(4);
1408 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1409 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1410 dprintk("Too many back channel attr bitmaps!\n");
1411 goto xdr_error;
1412 }
1413
1414 READ_BUF(4);
1415 sess->callback_prog = be32_to_cpup(p++);
1416 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1417 DECODE_TAIL;
1418 }
1419
1420 static __be32
1421 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1422 struct nfsd4_destroy_session *destroy_session)
1423 {
1424 DECODE_HEAD;
1425 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1426 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1427
1428 DECODE_TAIL;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1433 struct nfsd4_free_stateid *free_stateid)
1434 {
1435 DECODE_HEAD;
1436
1437 READ_BUF(sizeof(stateid_t));
1438 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1439 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1440
1441 DECODE_TAIL;
1442 }
1443
1444 static __be32
1445 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1446 struct nfsd4_sequence *seq)
1447 {
1448 DECODE_HEAD;
1449
1450 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1451 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1452 seq->seqid = be32_to_cpup(p++);
1453 seq->slotid = be32_to_cpup(p++);
1454 seq->maxslots = be32_to_cpup(p++);
1455 seq->cachethis = be32_to_cpup(p++);
1456
1457 DECODE_TAIL;
1458 }
1459
1460 static __be32
1461 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1462 {
1463 int i;
1464 __be32 *p, status;
1465 struct nfsd4_test_stateid_id *stateid;
1466
1467 READ_BUF(4);
1468 test_stateid->ts_num_ids = ntohl(*p++);
1469
1470 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1471
1472 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1473 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1474 if (!stateid) {
1475 status = nfserrno(-ENOMEM);
1476 goto out;
1477 }
1478
1479 INIT_LIST_HEAD(&stateid->ts_id_list);
1480 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1481
1482 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1483 if (status)
1484 goto out;
1485 }
1486
1487 status = 0;
1488 out:
1489 return status;
1490 xdr_error:
1491 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1492 status = nfserr_bad_xdr;
1493 goto out;
1494 }
1495
1496 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1497 {
1498 DECODE_HEAD;
1499
1500 READ_BUF(8);
1501 COPYMEM(&dc->clientid, 8);
1502
1503 DECODE_TAIL;
1504 }
1505
1506 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1507 {
1508 DECODE_HEAD;
1509
1510 READ_BUF(4);
1511 rc->rca_one_fs = be32_to_cpup(p++);
1512
1513 DECODE_TAIL;
1514 }
1515
1516 static __be32
1517 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1518 struct nfsd4_fallocate *fallocate)
1519 {
1520 DECODE_HEAD;
1521
1522 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1523 if (status)
1524 return status;
1525
1526 READ_BUF(16);
1527 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1528 xdr_decode_hyper(p, &fallocate->falloc_length);
1529
1530 DECODE_TAIL;
1531 }
1532
1533 static __be32
1534 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1535 {
1536 DECODE_HEAD;
1537
1538 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1539 if (status)
1540 return status;
1541
1542 READ_BUF(8 + 4);
1543 p = xdr_decode_hyper(p, &seek->seek_offset);
1544 seek->seek_whence = be32_to_cpup(p);
1545
1546 DECODE_TAIL;
1547 }
1548
1549 static __be32
1550 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1551 {
1552 return nfs_ok;
1553 }
1554
1555 static __be32
1556 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1557 {
1558 return nfserr_notsupp;
1559 }
1560
1561 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1562
1563 static nfsd4_dec nfsd4_dec_ops[] = {
1564 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1565 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1566 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1567 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1568 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1569 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1570 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1571 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1572 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1573 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1574 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1575 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1576 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1577 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1578 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1579 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1580 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1581 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1582 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1583 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1584 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1585 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1586 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1587 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1588 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1589 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1590 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1591 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1592 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1593 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1594 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1595 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1596 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1597 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1598 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1599 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1600 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1601
1602 /* new operations for NFSv4.1 */
1603 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1604 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1605 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1606 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1607 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1608 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1609 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1610 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1611 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1612 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1613 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1614 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1615 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1616 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1617 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1618 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1619 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1620 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1621 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1622
1623 /* new operations for NFSv4.2 */
1624 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1625 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1626 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1627 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1628 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1629 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1630 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1631 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1632 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1633 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1634 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1635 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1636 };
1637
1638 static inline bool
1639 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1640 {
1641 if (op->opnum < FIRST_NFS4_OP)
1642 return false;
1643 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1644 return false;
1645 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1646 return false;
1647 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1648 return false;
1649 return true;
1650 }
1651
1652 static __be32
1653 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1654 {
1655 DECODE_HEAD;
1656 struct nfsd4_op *op;
1657 bool cachethis = false;
1658 int auth_slack= argp->rqstp->rq_auth_slack;
1659 int max_reply = auth_slack + 8; /* opcnt, status */
1660 int readcount = 0;
1661 int readbytes = 0;
1662 int i;
1663
1664 READ_BUF(4);
1665 argp->taglen = be32_to_cpup(p++);
1666 READ_BUF(argp->taglen + 8);
1667 SAVEMEM(argp->tag, argp->taglen);
1668 argp->minorversion = be32_to_cpup(p++);
1669 argp->opcnt = be32_to_cpup(p++);
1670 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1671
1672 if (argp->taglen > NFSD4_MAX_TAGLEN)
1673 goto xdr_error;
1674 if (argp->opcnt > 100)
1675 goto xdr_error;
1676
1677 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1678 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1679 if (!argp->ops) {
1680 argp->ops = argp->iops;
1681 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1682 goto xdr_error;
1683 }
1684 }
1685
1686 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1687 argp->opcnt = 0;
1688
1689 for (i = 0; i < argp->opcnt; i++) {
1690 op = &argp->ops[i];
1691 op->replay = NULL;
1692
1693 READ_BUF(4);
1694 op->opnum = be32_to_cpup(p++);
1695
1696 if (nfsd4_opnum_in_range(argp, op))
1697 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1698 else {
1699 op->opnum = OP_ILLEGAL;
1700 op->status = nfserr_op_illegal;
1701 }
1702 /*
1703 * We'll try to cache the result in the DRC if any one
1704 * op in the compound wants to be cached:
1705 */
1706 cachethis |= nfsd4_cache_this_op(op);
1707
1708 if (op->opnum == OP_READ) {
1709 readcount++;
1710 readbytes += nfsd4_max_reply(argp->rqstp, op);
1711 } else
1712 max_reply += nfsd4_max_reply(argp->rqstp, op);
1713 /*
1714 * OP_LOCK may return a conflicting lock. (Special case
1715 * because it will just skip encoding this if it runs
1716 * out of xdr buffer space, and it is the only operation
1717 * that behaves this way.)
1718 */
1719 if (op->opnum == OP_LOCK)
1720 max_reply += NFS4_OPAQUE_LIMIT;
1721
1722 if (op->status) {
1723 argp->opcnt = i+1;
1724 break;
1725 }
1726 }
1727 /* Sessions make the DRC unnecessary: */
1728 if (argp->minorversion)
1729 cachethis = false;
1730 svc_reserve(argp->rqstp, max_reply + readbytes);
1731 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1732
1733 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1734 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1735
1736 DECODE_TAIL;
1737 }
1738
1739 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1740 {
1741 if (IS_I_VERSION(inode)) {
1742 p = xdr_encode_hyper(p, inode->i_version);
1743 } else {
1744 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1745 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1746 }
1747 return p;
1748 }
1749
1750 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1751 {
1752 *p++ = cpu_to_be32(c->atomic);
1753 if (c->change_supported) {
1754 p = xdr_encode_hyper(p, c->before_change);
1755 p = xdr_encode_hyper(p, c->after_change);
1756 } else {
1757 *p++ = cpu_to_be32(c->before_ctime_sec);
1758 *p++ = cpu_to_be32(c->before_ctime_nsec);
1759 *p++ = cpu_to_be32(c->after_ctime_sec);
1760 *p++ = cpu_to_be32(c->after_ctime_nsec);
1761 }
1762 return p;
1763 }
1764
1765 /* Encode as an array of strings the string given with components
1766 * separated @sep, escaped with esc_enter and esc_exit.
1767 */
1768 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1769 char *components, char esc_enter,
1770 char esc_exit)
1771 {
1772 __be32 *p;
1773 __be32 pathlen;
1774 int pathlen_offset;
1775 int strlen, count=0;
1776 char *str, *end, *next;
1777
1778 dprintk("nfsd4_encode_components(%s)\n", components);
1779
1780 pathlen_offset = xdr->buf->len;
1781 p = xdr_reserve_space(xdr, 4);
1782 if (!p)
1783 return nfserr_resource;
1784 p++; /* We will fill this in with @count later */
1785
1786 end = str = components;
1787 while (*end) {
1788 bool found_esc = false;
1789
1790 /* try to parse as esc_start, ..., esc_end, sep */
1791 if (*str == esc_enter) {
1792 for (; *end && (*end != esc_exit); end++)
1793 /* find esc_exit or end of string */;
1794 next = end + 1;
1795 if (*end && (!*next || *next == sep)) {
1796 str++;
1797 found_esc = true;
1798 }
1799 }
1800
1801 if (!found_esc)
1802 for (; *end && (*end != sep); end++)
1803 /* find sep or end of string */;
1804
1805 strlen = end - str;
1806 if (strlen) {
1807 p = xdr_reserve_space(xdr, strlen + 4);
1808 if (!p)
1809 return nfserr_resource;
1810 p = xdr_encode_opaque(p, str, strlen);
1811 count++;
1812 }
1813 else
1814 end++;
1815 if (found_esc)
1816 end = next;
1817
1818 str = end;
1819 }
1820 pathlen = htonl(count);
1821 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1822 return 0;
1823 }
1824
1825 /* Encode as an array of strings the string given with components
1826 * separated @sep.
1827 */
1828 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1829 char *components)
1830 {
1831 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1832 }
1833
1834 /*
1835 * encode a location element of a fs_locations structure
1836 */
1837 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1838 struct nfsd4_fs_location *location)
1839 {
1840 __be32 status;
1841
1842 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1843 '[', ']');
1844 if (status)
1845 return status;
1846 status = nfsd4_encode_components(xdr, '/', location->path);
1847 if (status)
1848 return status;
1849 return 0;
1850 }
1851
1852 /*
1853 * Encode a path in RFC3530 'pathname4' format
1854 */
1855 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1856 const struct path *root,
1857 const struct path *path)
1858 {
1859 struct path cur = *path;
1860 __be32 *p;
1861 struct dentry **components = NULL;
1862 unsigned int ncomponents = 0;
1863 __be32 err = nfserr_jukebox;
1864
1865 dprintk("nfsd4_encode_components(");
1866
1867 path_get(&cur);
1868 /* First walk the path up to the nfsd root, and store the
1869 * dentries/path components in an array.
1870 */
1871 for (;;) {
1872 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1873 break;
1874 if (cur.dentry == cur.mnt->mnt_root) {
1875 if (follow_up(&cur))
1876 continue;
1877 goto out_free;
1878 }
1879 if ((ncomponents & 15) == 0) {
1880 struct dentry **new;
1881 new = krealloc(components,
1882 sizeof(*new) * (ncomponents + 16),
1883 GFP_KERNEL);
1884 if (!new)
1885 goto out_free;
1886 components = new;
1887 }
1888 components[ncomponents++] = cur.dentry;
1889 cur.dentry = dget_parent(cur.dentry);
1890 }
1891 err = nfserr_resource;
1892 p = xdr_reserve_space(xdr, 4);
1893 if (!p)
1894 goto out_free;
1895 *p++ = cpu_to_be32(ncomponents);
1896
1897 while (ncomponents) {
1898 struct dentry *dentry = components[ncomponents - 1];
1899 unsigned int len;
1900
1901 spin_lock(&dentry->d_lock);
1902 len = dentry->d_name.len;
1903 p = xdr_reserve_space(xdr, len + 4);
1904 if (!p) {
1905 spin_unlock(&dentry->d_lock);
1906 goto out_free;
1907 }
1908 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1909 dprintk("/%pd", dentry);
1910 spin_unlock(&dentry->d_lock);
1911 dput(dentry);
1912 ncomponents--;
1913 }
1914
1915 err = 0;
1916 out_free:
1917 dprintk(")\n");
1918 while (ncomponents)
1919 dput(components[--ncomponents]);
1920 kfree(components);
1921 path_put(&cur);
1922 return err;
1923 }
1924
1925 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1926 struct svc_rqst *rqstp, const struct path *path)
1927 {
1928 struct svc_export *exp_ps;
1929 __be32 res;
1930
1931 exp_ps = rqst_find_fsidzero_export(rqstp);
1932 if (IS_ERR(exp_ps))
1933 return nfserrno(PTR_ERR(exp_ps));
1934 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1935 exp_put(exp_ps);
1936 return res;
1937 }
1938
1939 /*
1940 * encode a fs_locations structure
1941 */
1942 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1943 struct svc_rqst *rqstp, struct svc_export *exp)
1944 {
1945 __be32 status;
1946 int i;
1947 __be32 *p;
1948 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1949
1950 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1951 if (status)
1952 return status;
1953 p = xdr_reserve_space(xdr, 4);
1954 if (!p)
1955 return nfserr_resource;
1956 *p++ = cpu_to_be32(fslocs->locations_count);
1957 for (i=0; i<fslocs->locations_count; i++) {
1958 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1959 if (status)
1960 return status;
1961 }
1962 return 0;
1963 }
1964
1965 static u32 nfs4_file_type(umode_t mode)
1966 {
1967 switch (mode & S_IFMT) {
1968 case S_IFIFO: return NF4FIFO;
1969 case S_IFCHR: return NF4CHR;
1970 case S_IFDIR: return NF4DIR;
1971 case S_IFBLK: return NF4BLK;
1972 case S_IFLNK: return NF4LNK;
1973 case S_IFREG: return NF4REG;
1974 case S_IFSOCK: return NF4SOCK;
1975 default: return NF4BAD;
1976 };
1977 }
1978
1979 static inline __be32
1980 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1981 struct nfs4_ace *ace)
1982 {
1983 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1984 return nfs4_acl_write_who(xdr, ace->whotype);
1985 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1986 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1987 else
1988 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1989 }
1990
1991 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1992 FATTR4_WORD0_RDATTR_ERROR)
1993 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1994
1995 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1996 static inline __be32
1997 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1998 void *context, int len)
1999 {
2000 __be32 *p;
2001
2002 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2003 if (!p)
2004 return nfserr_resource;
2005
2006 /*
2007 * For now we use a 0 here to indicate the null translation; in
2008 * the future we may place a call to translation code here.
2009 */
2010 *p++ = cpu_to_be32(0); /* lfs */
2011 *p++ = cpu_to_be32(0); /* pi */
2012 p = xdr_encode_opaque(p, context, len);
2013 return 0;
2014 }
2015 #else
2016 static inline __be32
2017 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2018 void *context, int len)
2019 { return 0; }
2020 #endif
2021
2022 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2023 {
2024 /* As per referral draft: */
2025 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2026 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2027 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2028 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2029 *rdattr_err = NFSERR_MOVED;
2030 else
2031 return nfserr_moved;
2032 }
2033 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2034 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2035 return 0;
2036 }
2037
2038
2039 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2040 {
2041 struct path path = exp->ex_path;
2042 int err;
2043
2044 path_get(&path);
2045 while (follow_up(&path)) {
2046 if (path.dentry != path.mnt->mnt_root)
2047 break;
2048 }
2049 err = vfs_getattr(&path, stat);
2050 path_put(&path);
2051 return err;
2052 }
2053
2054 /*
2055 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2056 * ourselves.
2057 */
2058 static __be32
2059 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2060 struct svc_export *exp,
2061 struct dentry *dentry, u32 *bmval,
2062 struct svc_rqst *rqstp, int ignore_crossmnt)
2063 {
2064 u32 bmval0 = bmval[0];
2065 u32 bmval1 = bmval[1];
2066 u32 bmval2 = bmval[2];
2067 struct kstat stat;
2068 struct svc_fh *tempfh = NULL;
2069 struct kstatfs statfs;
2070 __be32 *p;
2071 int starting_len = xdr->buf->len;
2072 int attrlen_offset;
2073 __be32 attrlen;
2074 u32 dummy;
2075 u64 dummy64;
2076 u32 rdattr_err = 0;
2077 __be32 status;
2078 int err;
2079 int aclsupport = 0;
2080 struct nfs4_acl *acl = NULL;
2081 void *context = NULL;
2082 int contextlen;
2083 bool contextsupport = false;
2084 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2085 u32 minorversion = resp->cstate.minorversion;
2086 struct path path = {
2087 .mnt = exp->ex_path.mnt,
2088 .dentry = dentry,
2089 };
2090 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2091
2092 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2093 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2094 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2095 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2096
2097 if (exp->ex_fslocs.migrated) {
2098 BUG_ON(bmval[2]);
2099 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2100 if (status)
2101 goto out;
2102 }
2103
2104 err = vfs_getattr(&path, &stat);
2105 if (err)
2106 goto out_nfserr;
2107 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2108 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2109 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2110 FATTR4_WORD1_SPACE_TOTAL))) {
2111 err = vfs_statfs(&path, &statfs);
2112 if (err)
2113 goto out_nfserr;
2114 }
2115 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2116 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2117 status = nfserr_jukebox;
2118 if (!tempfh)
2119 goto out;
2120 fh_init(tempfh, NFS4_FHSIZE);
2121 status = fh_compose(tempfh, exp, dentry, NULL);
2122 if (status)
2123 goto out;
2124 fhp = tempfh;
2125 }
2126 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2127 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2128 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2129 aclsupport = (err == 0);
2130 if (bmval0 & FATTR4_WORD0_ACL) {
2131 if (err == -EOPNOTSUPP)
2132 bmval0 &= ~FATTR4_WORD0_ACL;
2133 else if (err == -EINVAL) {
2134 status = nfserr_attrnotsupp;
2135 goto out;
2136 } else if (err != 0)
2137 goto out_nfserr;
2138 }
2139 }
2140
2141 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2142 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2143 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2144 err = security_inode_getsecctx(dentry->d_inode,
2145 &context, &contextlen);
2146 contextsupport = (err == 0);
2147 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2148 if (err == -EOPNOTSUPP)
2149 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2150 else if (err)
2151 goto out_nfserr;
2152 }
2153 }
2154 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2155
2156 if (bmval2) {
2157 p = xdr_reserve_space(xdr, 16);
2158 if (!p)
2159 goto out_resource;
2160 *p++ = cpu_to_be32(3);
2161 *p++ = cpu_to_be32(bmval0);
2162 *p++ = cpu_to_be32(bmval1);
2163 *p++ = cpu_to_be32(bmval2);
2164 } else if (bmval1) {
2165 p = xdr_reserve_space(xdr, 12);
2166 if (!p)
2167 goto out_resource;
2168 *p++ = cpu_to_be32(2);
2169 *p++ = cpu_to_be32(bmval0);
2170 *p++ = cpu_to_be32(bmval1);
2171 } else {
2172 p = xdr_reserve_space(xdr, 8);
2173 if (!p)
2174 goto out_resource;
2175 *p++ = cpu_to_be32(1);
2176 *p++ = cpu_to_be32(bmval0);
2177 }
2178
2179 attrlen_offset = xdr->buf->len;
2180 p = xdr_reserve_space(xdr, 4);
2181 if (!p)
2182 goto out_resource;
2183 p++; /* to be backfilled later */
2184
2185 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2186 u32 word0 = nfsd_suppattrs0(minorversion);
2187 u32 word1 = nfsd_suppattrs1(minorversion);
2188 u32 word2 = nfsd_suppattrs2(minorversion);
2189
2190 if (!aclsupport)
2191 word0 &= ~FATTR4_WORD0_ACL;
2192 if (!contextsupport)
2193 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2194 if (!word2) {
2195 p = xdr_reserve_space(xdr, 12);
2196 if (!p)
2197 goto out_resource;
2198 *p++ = cpu_to_be32(2);
2199 *p++ = cpu_to_be32(word0);
2200 *p++ = cpu_to_be32(word1);
2201 } else {
2202 p = xdr_reserve_space(xdr, 16);
2203 if (!p)
2204 goto out_resource;
2205 *p++ = cpu_to_be32(3);
2206 *p++ = cpu_to_be32(word0);
2207 *p++ = cpu_to_be32(word1);
2208 *p++ = cpu_to_be32(word2);
2209 }
2210 }
2211 if (bmval0 & FATTR4_WORD0_TYPE) {
2212 p = xdr_reserve_space(xdr, 4);
2213 if (!p)
2214 goto out_resource;
2215 dummy = nfs4_file_type(stat.mode);
2216 if (dummy == NF4BAD) {
2217 status = nfserr_serverfault;
2218 goto out;
2219 }
2220 *p++ = cpu_to_be32(dummy);
2221 }
2222 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2223 p = xdr_reserve_space(xdr, 4);
2224 if (!p)
2225 goto out_resource;
2226 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2227 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2228 else
2229 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2230 NFS4_FH_VOL_RENAME);
2231 }
2232 if (bmval0 & FATTR4_WORD0_CHANGE) {
2233 p = xdr_reserve_space(xdr, 8);
2234 if (!p)
2235 goto out_resource;
2236 p = encode_change(p, &stat, dentry->d_inode);
2237 }
2238 if (bmval0 & FATTR4_WORD0_SIZE) {
2239 p = xdr_reserve_space(xdr, 8);
2240 if (!p)
2241 goto out_resource;
2242 p = xdr_encode_hyper(p, stat.size);
2243 }
2244 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2245 p = xdr_reserve_space(xdr, 4);
2246 if (!p)
2247 goto out_resource;
2248 *p++ = cpu_to_be32(1);
2249 }
2250 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2251 p = xdr_reserve_space(xdr, 4);
2252 if (!p)
2253 goto out_resource;
2254 *p++ = cpu_to_be32(1);
2255 }
2256 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2257 p = xdr_reserve_space(xdr, 4);
2258 if (!p)
2259 goto out_resource;
2260 *p++ = cpu_to_be32(0);
2261 }
2262 if (bmval0 & FATTR4_WORD0_FSID) {
2263 p = xdr_reserve_space(xdr, 16);
2264 if (!p)
2265 goto out_resource;
2266 if (exp->ex_fslocs.migrated) {
2267 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2268 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2269 } else switch(fsid_source(fhp)) {
2270 case FSIDSOURCE_FSID:
2271 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2272 p = xdr_encode_hyper(p, (u64)0);
2273 break;
2274 case FSIDSOURCE_DEV:
2275 *p++ = cpu_to_be32(0);
2276 *p++ = cpu_to_be32(MAJOR(stat.dev));
2277 *p++ = cpu_to_be32(0);
2278 *p++ = cpu_to_be32(MINOR(stat.dev));
2279 break;
2280 case FSIDSOURCE_UUID:
2281 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2282 EX_UUID_LEN);
2283 break;
2284 }
2285 }
2286 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2287 p = xdr_reserve_space(xdr, 4);
2288 if (!p)
2289 goto out_resource;
2290 *p++ = cpu_to_be32(0);
2291 }
2292 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2293 p = xdr_reserve_space(xdr, 4);
2294 if (!p)
2295 goto out_resource;
2296 *p++ = cpu_to_be32(nn->nfsd4_lease);
2297 }
2298 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2299 p = xdr_reserve_space(xdr, 4);
2300 if (!p)
2301 goto out_resource;
2302 *p++ = cpu_to_be32(rdattr_err);
2303 }
2304 if (bmval0 & FATTR4_WORD0_ACL) {
2305 struct nfs4_ace *ace;
2306
2307 if (acl == NULL) {
2308 p = xdr_reserve_space(xdr, 4);
2309 if (!p)
2310 goto out_resource;
2311
2312 *p++ = cpu_to_be32(0);
2313 goto out_acl;
2314 }
2315 p = xdr_reserve_space(xdr, 4);
2316 if (!p)
2317 goto out_resource;
2318 *p++ = cpu_to_be32(acl->naces);
2319
2320 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2321 p = xdr_reserve_space(xdr, 4*3);
2322 if (!p)
2323 goto out_resource;
2324 *p++ = cpu_to_be32(ace->type);
2325 *p++ = cpu_to_be32(ace->flag);
2326 *p++ = cpu_to_be32(ace->access_mask &
2327 NFS4_ACE_MASK_ALL);
2328 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2329 if (status)
2330 goto out;
2331 }
2332 }
2333 out_acl:
2334 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2335 p = xdr_reserve_space(xdr, 4);
2336 if (!p)
2337 goto out_resource;
2338 *p++ = cpu_to_be32(aclsupport ?
2339 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2340 }
2341 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2342 p = xdr_reserve_space(xdr, 4);
2343 if (!p)
2344 goto out_resource;
2345 *p++ = cpu_to_be32(1);
2346 }
2347 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2348 p = xdr_reserve_space(xdr, 4);
2349 if (!p)
2350 goto out_resource;
2351 *p++ = cpu_to_be32(0);
2352 }
2353 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2354 p = xdr_reserve_space(xdr, 4);
2355 if (!p)
2356 goto out_resource;
2357 *p++ = cpu_to_be32(1);
2358 }
2359 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2360 p = xdr_reserve_space(xdr, 4);
2361 if (!p)
2362 goto out_resource;
2363 *p++ = cpu_to_be32(1);
2364 }
2365 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2366 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2367 if (!p)
2368 goto out_resource;
2369 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2370 fhp->fh_handle.fh_size);
2371 }
2372 if (bmval0 & FATTR4_WORD0_FILEID) {
2373 p = xdr_reserve_space(xdr, 8);
2374 if (!p)
2375 goto out_resource;
2376 p = xdr_encode_hyper(p, stat.ino);
2377 }
2378 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2379 p = xdr_reserve_space(xdr, 8);
2380 if (!p)
2381 goto out_resource;
2382 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2383 }
2384 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2385 p = xdr_reserve_space(xdr, 8);
2386 if (!p)
2387 goto out_resource;
2388 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2389 }
2390 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2391 p = xdr_reserve_space(xdr, 8);
2392 if (!p)
2393 goto out_resource;
2394 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2395 }
2396 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2397 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2398 if (status)
2399 goto out;
2400 }
2401 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2402 p = xdr_reserve_space(xdr, 4);
2403 if (!p)
2404 goto out_resource;
2405 *p++ = cpu_to_be32(1);
2406 }
2407 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2408 p = xdr_reserve_space(xdr, 8);
2409 if (!p)
2410 goto out_resource;
2411 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2412 }
2413 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2414 p = xdr_reserve_space(xdr, 4);
2415 if (!p)
2416 goto out_resource;
2417 *p++ = cpu_to_be32(255);
2418 }
2419 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2420 p = xdr_reserve_space(xdr, 4);
2421 if (!p)
2422 goto out_resource;
2423 *p++ = cpu_to_be32(statfs.f_namelen);
2424 }
2425 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2426 p = xdr_reserve_space(xdr, 8);
2427 if (!p)
2428 goto out_resource;
2429 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2430 }
2431 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2432 p = xdr_reserve_space(xdr, 8);
2433 if (!p)
2434 goto out_resource;
2435 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2436 }
2437 if (bmval1 & FATTR4_WORD1_MODE) {
2438 p = xdr_reserve_space(xdr, 4);
2439 if (!p)
2440 goto out_resource;
2441 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2442 }
2443 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2444 p = xdr_reserve_space(xdr, 4);
2445 if (!p)
2446 goto out_resource;
2447 *p++ = cpu_to_be32(1);
2448 }
2449 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2450 p = xdr_reserve_space(xdr, 4);
2451 if (!p)
2452 goto out_resource;
2453 *p++ = cpu_to_be32(stat.nlink);
2454 }
2455 if (bmval1 & FATTR4_WORD1_OWNER) {
2456 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2457 if (status)
2458 goto out;
2459 }
2460 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2461 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2462 if (status)
2463 goto out;
2464 }
2465 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2466 p = xdr_reserve_space(xdr, 8);
2467 if (!p)
2468 goto out_resource;
2469 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2470 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2471 }
2472 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2473 p = xdr_reserve_space(xdr, 8);
2474 if (!p)
2475 goto out_resource;
2476 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2477 p = xdr_encode_hyper(p, dummy64);
2478 }
2479 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2480 p = xdr_reserve_space(xdr, 8);
2481 if (!p)
2482 goto out_resource;
2483 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2484 p = xdr_encode_hyper(p, dummy64);
2485 }
2486 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2487 p = xdr_reserve_space(xdr, 8);
2488 if (!p)
2489 goto out_resource;
2490 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2491 p = xdr_encode_hyper(p, dummy64);
2492 }
2493 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2494 p = xdr_reserve_space(xdr, 8);
2495 if (!p)
2496 goto out_resource;
2497 dummy64 = (u64)stat.blocks << 9;
2498 p = xdr_encode_hyper(p, dummy64);
2499 }
2500 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2501 p = xdr_reserve_space(xdr, 12);
2502 if (!p)
2503 goto out_resource;
2504 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2505 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2506 }
2507 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2508 p = xdr_reserve_space(xdr, 12);
2509 if (!p)
2510 goto out_resource;
2511 *p++ = cpu_to_be32(0);
2512 *p++ = cpu_to_be32(1);
2513 *p++ = cpu_to_be32(0);
2514 }
2515 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2516 p = xdr_reserve_space(xdr, 12);
2517 if (!p)
2518 goto out_resource;
2519 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2520 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2521 }
2522 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2523 p = xdr_reserve_space(xdr, 12);
2524 if (!p)
2525 goto out_resource;
2526 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2527 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2528 }
2529 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2530 p = xdr_reserve_space(xdr, 8);
2531 if (!p)
2532 goto out_resource;
2533 /*
2534 * Get parent's attributes if not ignoring crossmount
2535 * and this is the root of a cross-mounted filesystem.
2536 */
2537 if (ignore_crossmnt == 0 &&
2538 dentry == exp->ex_path.mnt->mnt_root)
2539 get_parent_attributes(exp, &stat);
2540 p = xdr_encode_hyper(p, stat.ino);
2541 }
2542 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2543 status = nfsd4_encode_security_label(xdr, rqstp, context,
2544 contextlen);
2545 if (status)
2546 goto out;
2547 }
2548 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2549 p = xdr_reserve_space(xdr, 16);
2550 if (!p)
2551 goto out_resource;
2552 *p++ = cpu_to_be32(3);
2553 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2554 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2555 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2556 }
2557
2558 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2559 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2560 status = nfs_ok;
2561
2562 out:
2563 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2564 if (context)
2565 security_release_secctx(context, contextlen);
2566 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2567 kfree(acl);
2568 if (tempfh) {
2569 fh_put(tempfh);
2570 kfree(tempfh);
2571 }
2572 if (status)
2573 xdr_truncate_encode(xdr, starting_len);
2574 return status;
2575 out_nfserr:
2576 status = nfserrno(err);
2577 goto out;
2578 out_resource:
2579 status = nfserr_resource;
2580 goto out;
2581 }
2582
2583 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2584 struct xdr_buf *buf, __be32 *p, int bytes)
2585 {
2586 xdr->scratch.iov_len = 0;
2587 memset(buf, 0, sizeof(struct xdr_buf));
2588 buf->head[0].iov_base = p;
2589 buf->head[0].iov_len = 0;
2590 buf->len = 0;
2591 xdr->buf = buf;
2592 xdr->iov = buf->head;
2593 xdr->p = p;
2594 xdr->end = (void *)p + bytes;
2595 buf->buflen = bytes;
2596 }
2597
2598 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2599 struct svc_fh *fhp, struct svc_export *exp,
2600 struct dentry *dentry, u32 *bmval,
2601 struct svc_rqst *rqstp, int ignore_crossmnt)
2602 {
2603 struct xdr_buf dummy;
2604 struct xdr_stream xdr;
2605 __be32 ret;
2606
2607 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2608 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2609 ignore_crossmnt);
2610 *p = xdr.p;
2611 return ret;
2612 }
2613
2614 static inline int attributes_need_mount(u32 *bmval)
2615 {
2616 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2617 return 1;
2618 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2619 return 1;
2620 return 0;
2621 }
2622
2623 static __be32
2624 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2625 const char *name, int namlen)
2626 {
2627 struct svc_export *exp = cd->rd_fhp->fh_export;
2628 struct dentry *dentry;
2629 __be32 nfserr;
2630 int ignore_crossmnt = 0;
2631
2632 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2633 if (IS_ERR(dentry))
2634 return nfserrno(PTR_ERR(dentry));
2635 if (!dentry->d_inode) {
2636 /*
2637 * nfsd_buffered_readdir drops the i_mutex between
2638 * readdir and calling this callback, leaving a window
2639 * where this directory entry could have gone away.
2640 */
2641 dput(dentry);
2642 return nfserr_noent;
2643 }
2644
2645 exp_get(exp);
2646 /*
2647 * In the case of a mountpoint, the client may be asking for
2648 * attributes that are only properties of the underlying filesystem
2649 * as opposed to the cross-mounted file system. In such a case,
2650 * we will not follow the cross mount and will fill the attribtutes
2651 * directly from the mountpoint dentry.
2652 */
2653 if (nfsd_mountpoint(dentry, exp)) {
2654 int err;
2655
2656 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2657 && !attributes_need_mount(cd->rd_bmval)) {
2658 ignore_crossmnt = 1;
2659 goto out_encode;
2660 }
2661 /*
2662 * Why the heck aren't we just using nfsd_lookup??
2663 * Different "."/".." handling? Something else?
2664 * At least, add a comment here to explain....
2665 */
2666 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2667 if (err) {
2668 nfserr = nfserrno(err);
2669 goto out_put;
2670 }
2671 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2672 if (nfserr)
2673 goto out_put;
2674
2675 }
2676 out_encode:
2677 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2678 cd->rd_rqstp, ignore_crossmnt);
2679 out_put:
2680 dput(dentry);
2681 exp_put(exp);
2682 return nfserr;
2683 }
2684
2685 static __be32 *
2686 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2687 {
2688 __be32 *p;
2689
2690 p = xdr_reserve_space(xdr, 20);
2691 if (!p)
2692 return NULL;
2693 *p++ = htonl(2);
2694 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2695 *p++ = htonl(0); /* bmval1 */
2696
2697 *p++ = htonl(4); /* attribute length */
2698 *p++ = nfserr; /* no htonl */
2699 return p;
2700 }
2701
2702 static int
2703 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2704 loff_t offset, u64 ino, unsigned int d_type)
2705 {
2706 struct readdir_cd *ccd = ccdv;
2707 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2708 struct xdr_stream *xdr = cd->xdr;
2709 int start_offset = xdr->buf->len;
2710 int cookie_offset;
2711 u32 name_and_cookie;
2712 int entry_bytes;
2713 __be32 nfserr = nfserr_toosmall;
2714 __be64 wire_offset;
2715 __be32 *p;
2716
2717 /* In nfsv4, "." and ".." never make it onto the wire.. */
2718 if (name && isdotent(name, namlen)) {
2719 cd->common.err = nfs_ok;
2720 return 0;
2721 }
2722
2723 if (cd->cookie_offset) {
2724 wire_offset = cpu_to_be64(offset);
2725 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2726 &wire_offset, 8);
2727 }
2728
2729 p = xdr_reserve_space(xdr, 4);
2730 if (!p)
2731 goto fail;
2732 *p++ = xdr_one; /* mark entry present */
2733 cookie_offset = xdr->buf->len;
2734 p = xdr_reserve_space(xdr, 3*4 + namlen);
2735 if (!p)
2736 goto fail;
2737 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2738 p = xdr_encode_array(p, name, namlen); /* name length & name */
2739
2740 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2741 switch (nfserr) {
2742 case nfs_ok:
2743 break;
2744 case nfserr_resource:
2745 nfserr = nfserr_toosmall;
2746 goto fail;
2747 case nfserr_noent:
2748 xdr_truncate_encode(xdr, start_offset);
2749 goto skip_entry;
2750 default:
2751 /*
2752 * If the client requested the RDATTR_ERROR attribute,
2753 * we stuff the error code into this attribute
2754 * and continue. If this attribute was not requested,
2755 * then in accordance with the spec, we fail the
2756 * entire READDIR operation(!)
2757 */
2758 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2759 goto fail;
2760 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2761 if (p == NULL) {
2762 nfserr = nfserr_toosmall;
2763 goto fail;
2764 }
2765 }
2766 nfserr = nfserr_toosmall;
2767 entry_bytes = xdr->buf->len - start_offset;
2768 if (entry_bytes > cd->rd_maxcount)
2769 goto fail;
2770 cd->rd_maxcount -= entry_bytes;
2771 if (!cd->rd_dircount)
2772 goto fail;
2773 /*
2774 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2775 * let's always let through the first entry, at least:
2776 */
2777 name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2778 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2779 goto fail;
2780 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2781 cd->cookie_offset = cookie_offset;
2782 skip_entry:
2783 cd->common.err = nfs_ok;
2784 return 0;
2785 fail:
2786 xdr_truncate_encode(xdr, start_offset);
2787 cd->common.err = nfserr;
2788 return -EINVAL;
2789 }
2790
2791 static __be32
2792 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2793 {
2794 __be32 *p;
2795
2796 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2797 if (!p)
2798 return nfserr_resource;
2799 *p++ = cpu_to_be32(sid->si_generation);
2800 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2801 sizeof(stateid_opaque_t));
2802 return 0;
2803 }
2804
2805 static __be32
2806 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2807 {
2808 struct xdr_stream *xdr = &resp->xdr;
2809 __be32 *p;
2810
2811 if (!nfserr) {
2812 p = xdr_reserve_space(xdr, 8);
2813 if (!p)
2814 return nfserr_resource;
2815 *p++ = cpu_to_be32(access->ac_supported);
2816 *p++ = cpu_to_be32(access->ac_resp_access);
2817 }
2818 return nfserr;
2819 }
2820
2821 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2822 {
2823 struct xdr_stream *xdr = &resp->xdr;
2824 __be32 *p;
2825
2826 if (!nfserr) {
2827 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2828 if (!p)
2829 return nfserr_resource;
2830 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2831 NFS4_MAX_SESSIONID_LEN);
2832 *p++ = cpu_to_be32(bcts->dir);
2833 /* Sorry, we do not yet support RDMA over 4.1: */
2834 *p++ = cpu_to_be32(0);
2835 }
2836 return nfserr;
2837 }
2838
2839 static __be32
2840 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2841 {
2842 struct xdr_stream *xdr = &resp->xdr;
2843
2844 if (!nfserr)
2845 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2846
2847 return nfserr;
2848 }
2849
2850
2851 static __be32
2852 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2853 {
2854 struct xdr_stream *xdr = &resp->xdr;
2855 __be32 *p;
2856
2857 if (!nfserr) {
2858 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2859 if (!p)
2860 return nfserr_resource;
2861 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2862 NFS4_VERIFIER_SIZE);
2863 }
2864 return nfserr;
2865 }
2866
2867 static __be32
2868 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2869 {
2870 struct xdr_stream *xdr = &resp->xdr;
2871 __be32 *p;
2872
2873 if (!nfserr) {
2874 p = xdr_reserve_space(xdr, 32);
2875 if (!p)
2876 return nfserr_resource;
2877 p = encode_cinfo(p, &create->cr_cinfo);
2878 *p++ = cpu_to_be32(2);
2879 *p++ = cpu_to_be32(create->cr_bmval[0]);
2880 *p++ = cpu_to_be32(create->cr_bmval[1]);
2881 }
2882 return nfserr;
2883 }
2884
2885 static __be32
2886 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2887 {
2888 struct svc_fh *fhp = getattr->ga_fhp;
2889 struct xdr_stream *xdr = &resp->xdr;
2890
2891 if (nfserr)
2892 return nfserr;
2893
2894 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2895 getattr->ga_bmval,
2896 resp->rqstp, 0);
2897 return nfserr;
2898 }
2899
2900 static __be32
2901 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2902 {
2903 struct xdr_stream *xdr = &resp->xdr;
2904 struct svc_fh *fhp = *fhpp;
2905 unsigned int len;
2906 __be32 *p;
2907
2908 if (!nfserr) {
2909 len = fhp->fh_handle.fh_size;
2910 p = xdr_reserve_space(xdr, len + 4);
2911 if (!p)
2912 return nfserr_resource;
2913 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2914 }
2915 return nfserr;
2916 }
2917
2918 /*
2919 * Including all fields other than the name, a LOCK4denied structure requires
2920 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2921 */
2922 static __be32
2923 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2924 {
2925 struct xdr_netobj *conf = &ld->ld_owner;
2926 __be32 *p;
2927
2928 again:
2929 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2930 if (!p) {
2931 /*
2932 * Don't fail to return the result just because we can't
2933 * return the conflicting open:
2934 */
2935 if (conf->len) {
2936 kfree(conf->data);
2937 conf->len = 0;
2938 conf->data = NULL;
2939 goto again;
2940 }
2941 return nfserr_resource;
2942 }
2943 p = xdr_encode_hyper(p, ld->ld_start);
2944 p = xdr_encode_hyper(p, ld->ld_length);
2945 *p++ = cpu_to_be32(ld->ld_type);
2946 if (conf->len) {
2947 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2948 p = xdr_encode_opaque(p, conf->data, conf->len);
2949 kfree(conf->data);
2950 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2951 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2952 *p++ = cpu_to_be32(0); /* length of owner name */
2953 }
2954 return nfserr_denied;
2955 }
2956
2957 static __be32
2958 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2959 {
2960 struct xdr_stream *xdr = &resp->xdr;
2961
2962 if (!nfserr)
2963 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2964 else if (nfserr == nfserr_denied)
2965 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2966
2967 return nfserr;
2968 }
2969
2970 static __be32
2971 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2972 {
2973 struct xdr_stream *xdr = &resp->xdr;
2974
2975 if (nfserr == nfserr_denied)
2976 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2977 return nfserr;
2978 }
2979
2980 static __be32
2981 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2982 {
2983 struct xdr_stream *xdr = &resp->xdr;
2984
2985 if (!nfserr)
2986 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2987
2988 return nfserr;
2989 }
2990
2991
2992 static __be32
2993 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2994 {
2995 struct xdr_stream *xdr = &resp->xdr;
2996 __be32 *p;
2997
2998 if (!nfserr) {
2999 p = xdr_reserve_space(xdr, 20);
3000 if (!p)
3001 return nfserr_resource;
3002 p = encode_cinfo(p, &link->li_cinfo);
3003 }
3004 return nfserr;
3005 }
3006
3007
3008 static __be32
3009 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3010 {
3011 struct xdr_stream *xdr = &resp->xdr;
3012 __be32 *p;
3013
3014 if (nfserr)
3015 goto out;
3016
3017 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3018 if (nfserr)
3019 goto out;
3020 p = xdr_reserve_space(xdr, 40);
3021 if (!p)
3022 return nfserr_resource;
3023 p = encode_cinfo(p, &open->op_cinfo);
3024 *p++ = cpu_to_be32(open->op_rflags);
3025 *p++ = cpu_to_be32(2);
3026 *p++ = cpu_to_be32(open->op_bmval[0]);
3027 *p++ = cpu_to_be32(open->op_bmval[1]);
3028 *p++ = cpu_to_be32(open->op_delegate_type);
3029
3030 switch (open->op_delegate_type) {
3031 case NFS4_OPEN_DELEGATE_NONE:
3032 break;
3033 case NFS4_OPEN_DELEGATE_READ:
3034 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3035 if (nfserr)
3036 return nfserr;
3037 p = xdr_reserve_space(xdr, 20);
3038 if (!p)
3039 return nfserr_resource;
3040 *p++ = cpu_to_be32(open->op_recall);
3041
3042 /*
3043 * TODO: ACE's in delegations
3044 */
3045 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3046 *p++ = cpu_to_be32(0);
3047 *p++ = cpu_to_be32(0);
3048 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3049 break;
3050 case NFS4_OPEN_DELEGATE_WRITE:
3051 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3052 if (nfserr)
3053 return nfserr;
3054 p = xdr_reserve_space(xdr, 32);
3055 if (!p)
3056 return nfserr_resource;
3057 *p++ = cpu_to_be32(0);
3058
3059 /*
3060 * TODO: space_limit's in delegations
3061 */
3062 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3063 *p++ = cpu_to_be32(~(u32)0);
3064 *p++ = cpu_to_be32(~(u32)0);
3065
3066 /*
3067 * TODO: ACE's in delegations
3068 */
3069 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3070 *p++ = cpu_to_be32(0);
3071 *p++ = cpu_to_be32(0);
3072 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3073 break;
3074 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3075 switch (open->op_why_no_deleg) {
3076 case WND4_CONTENTION:
3077 case WND4_RESOURCE:
3078 p = xdr_reserve_space(xdr, 8);
3079 if (!p)
3080 return nfserr_resource;
3081 *p++ = cpu_to_be32(open->op_why_no_deleg);
3082 /* deleg signaling not supported yet: */
3083 *p++ = cpu_to_be32(0);
3084 break;
3085 default:
3086 p = xdr_reserve_space(xdr, 4);
3087 if (!p)
3088 return nfserr_resource;
3089 *p++ = cpu_to_be32(open->op_why_no_deleg);
3090 }
3091 break;
3092 default:
3093 BUG();
3094 }
3095 /* XXX save filehandle here */
3096 out:
3097 return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3102 {
3103 struct xdr_stream *xdr = &resp->xdr;
3104
3105 if (!nfserr)
3106 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3107
3108 return nfserr;
3109 }
3110
3111 static __be32
3112 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3113 {
3114 struct xdr_stream *xdr = &resp->xdr;
3115
3116 if (!nfserr)
3117 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3118
3119 return nfserr;
3120 }
3121
3122 static __be32 nfsd4_encode_splice_read(
3123 struct nfsd4_compoundres *resp,
3124 struct nfsd4_read *read,
3125 struct file *file, unsigned long maxcount)
3126 {
3127 struct xdr_stream *xdr = &resp->xdr;
3128 struct xdr_buf *buf = xdr->buf;
3129 u32 eof;
3130 int space_left;
3131 __be32 nfserr;
3132 __be32 *p = xdr->p - 2;
3133
3134 /* Make sure there will be room for padding if needed */
3135 if (xdr->end - xdr->p < 1)
3136 return nfserr_resource;
3137
3138 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3139 read->rd_offset, &maxcount);
3140 if (nfserr) {
3141 /*
3142 * nfsd_splice_actor may have already messed with the
3143 * page length; reset it so as not to confuse
3144 * xdr_truncate_encode:
3145 */
3146 buf->page_len = 0;
3147 return nfserr;
3148 }
3149
3150 eof = (read->rd_offset + maxcount >=
3151 read->rd_fhp->fh_dentry->d_inode->i_size);
3152
3153 *(p++) = htonl(eof);
3154 *(p++) = htonl(maxcount);
3155
3156 buf->page_len = maxcount;
3157 buf->len += maxcount;
3158 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3159 / PAGE_SIZE;
3160
3161 /* Use rest of head for padding and remaining ops: */
3162 buf->tail[0].iov_base = xdr->p;
3163 buf->tail[0].iov_len = 0;
3164 xdr->iov = buf->tail;
3165 if (maxcount&3) {
3166 int pad = 4 - (maxcount&3);
3167
3168 *(xdr->p++) = 0;
3169
3170 buf->tail[0].iov_base += maxcount&3;
3171 buf->tail[0].iov_len = pad;
3172 buf->len += pad;
3173 }
3174
3175 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3176 buf->buflen - buf->len);
3177 buf->buflen = buf->len + space_left;
3178 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3179
3180 return 0;
3181 }
3182
3183 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3184 struct nfsd4_read *read,
3185 struct file *file, unsigned long maxcount)
3186 {
3187 struct xdr_stream *xdr = &resp->xdr;
3188 u32 eof;
3189 int v;
3190 int starting_len = xdr->buf->len - 8;
3191 long len;
3192 int thislen;
3193 __be32 nfserr;
3194 __be32 tmp;
3195 __be32 *p;
3196 u32 zzz = 0;
3197 int pad;
3198
3199 len = maxcount;
3200 v = 0;
3201
3202 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3203 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3204 WARN_ON_ONCE(!p);
3205 resp->rqstp->rq_vec[v].iov_base = p;
3206 resp->rqstp->rq_vec[v].iov_len = thislen;
3207 v++;
3208 len -= thislen;
3209
3210 while (len) {
3211 thislen = min_t(long, len, PAGE_SIZE);
3212 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3213 WARN_ON_ONCE(!p);
3214 resp->rqstp->rq_vec[v].iov_base = p;
3215 resp->rqstp->rq_vec[v].iov_len = thislen;
3216 v++;
3217 len -= thislen;
3218 }
3219 read->rd_vlen = v;
3220
3221 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3222 read->rd_vlen, &maxcount);
3223 if (nfserr)
3224 return nfserr;
3225 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3226
3227 eof = (read->rd_offset + maxcount >=
3228 read->rd_fhp->fh_dentry->d_inode->i_size);
3229
3230 tmp = htonl(eof);
3231 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3232 tmp = htonl(maxcount);
3233 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3234
3235 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3236 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3237 &zzz, pad);
3238 return 0;
3239
3240 }
3241
3242 static __be32
3243 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3244 struct nfsd4_read *read)
3245 {
3246 unsigned long maxcount;
3247 struct xdr_stream *xdr = &resp->xdr;
3248 struct file *file = read->rd_filp;
3249 int starting_len = xdr->buf->len;
3250 struct raparms *ra;
3251 __be32 *p;
3252 __be32 err;
3253
3254 if (nfserr)
3255 return nfserr;
3256
3257 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3258 if (!p) {
3259 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3260 return nfserr_resource;
3261 }
3262 if (resp->xdr.buf->page_len && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3263 WARN_ON_ONCE(1);
3264 return nfserr_resource;
3265 }
3266 xdr_commit_encode(xdr);
3267
3268 maxcount = svc_max_payload(resp->rqstp);
3269 maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3270 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3271
3272 if (!read->rd_filp) {
3273 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3274 &file, &ra);
3275 if (err)
3276 goto err_truncate;
3277 }
3278
3279 if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3280 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3281 else
3282 err = nfsd4_encode_readv(resp, read, file, maxcount);
3283
3284 if (!read->rd_filp)
3285 nfsd_put_tmp_read_open(file, ra);
3286
3287 err_truncate:
3288 if (err)
3289 xdr_truncate_encode(xdr, starting_len);
3290 return err;
3291 }
3292
3293 static __be32
3294 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3295 {
3296 int maxcount;
3297 __be32 wire_count;
3298 int zero = 0;
3299 struct xdr_stream *xdr = &resp->xdr;
3300 int length_offset = xdr->buf->len;
3301 __be32 *p;
3302
3303 if (nfserr)
3304 return nfserr;
3305
3306 p = xdr_reserve_space(xdr, 4);
3307 if (!p)
3308 return nfserr_resource;
3309 maxcount = PAGE_SIZE;
3310
3311 p = xdr_reserve_space(xdr, maxcount);
3312 if (!p)
3313 return nfserr_resource;
3314 /*
3315 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3316 * if they would overflow the buffer. Is this kosher in NFSv4? If
3317 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3318 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3319 */
3320 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3321 (char *)p, &maxcount);
3322 if (nfserr == nfserr_isdir)
3323 nfserr = nfserr_inval;
3324 if (nfserr) {
3325 xdr_truncate_encode(xdr, length_offset);
3326 return nfserr;
3327 }
3328
3329 wire_count = htonl(maxcount);
3330 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3331 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3332 if (maxcount & 3)
3333 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3334 &zero, 4 - (maxcount&3));
3335 return 0;
3336 }
3337
3338 static __be32
3339 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3340 {
3341 int maxcount;
3342 int bytes_left;
3343 loff_t offset;
3344 __be64 wire_offset;
3345 struct xdr_stream *xdr = &resp->xdr;
3346 int starting_len = xdr->buf->len;
3347 __be32 *p;
3348
3349 if (nfserr)
3350 return nfserr;
3351
3352 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3353 if (!p)
3354 return nfserr_resource;
3355
3356 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3357 *p++ = cpu_to_be32(0);
3358 *p++ = cpu_to_be32(0);
3359 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3360 - (char *)resp->xdr.buf->head[0].iov_base;
3361
3362 /*
3363 * Number of bytes left for directory entries allowing for the
3364 * final 8 bytes of the readdir and a following failed op:
3365 */
3366 bytes_left = xdr->buf->buflen - xdr->buf->len
3367 - COMPOUND_ERR_SLACK_SPACE - 8;
3368 if (bytes_left < 0) {
3369 nfserr = nfserr_resource;
3370 goto err_no_verf;
3371 }
3372 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3373 /*
3374 * Note the rfc defines rd_maxcount as the size of the
3375 * READDIR4resok structure, which includes the verifier above
3376 * and the 8 bytes encoded at the end of this function:
3377 */
3378 if (maxcount < 16) {
3379 nfserr = nfserr_toosmall;
3380 goto err_no_verf;
3381 }
3382 maxcount = min_t(int, maxcount-16, bytes_left);
3383
3384 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3385 if (!readdir->rd_dircount)
3386 readdir->rd_dircount = INT_MAX;
3387
3388 readdir->xdr = xdr;
3389 readdir->rd_maxcount = maxcount;
3390 readdir->common.err = 0;
3391 readdir->cookie_offset = 0;
3392
3393 offset = readdir->rd_cookie;
3394 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3395 &offset,
3396 &readdir->common, nfsd4_encode_dirent);
3397 if (nfserr == nfs_ok &&
3398 readdir->common.err == nfserr_toosmall &&
3399 xdr->buf->len == starting_len + 8) {
3400 /* nothing encoded; which limit did we hit?: */
3401 if (maxcount - 16 < bytes_left)
3402 /* It was the fault of rd_maxcount: */
3403 nfserr = nfserr_toosmall;
3404 else
3405 /* We ran out of buffer space: */
3406 nfserr = nfserr_resource;
3407 }
3408 if (nfserr)
3409 goto err_no_verf;
3410
3411 if (readdir->cookie_offset) {
3412 wire_offset = cpu_to_be64(offset);
3413 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3414 &wire_offset, 8);
3415 }
3416
3417 p = xdr_reserve_space(xdr, 8);
3418 if (!p) {
3419 WARN_ON_ONCE(1);
3420 goto err_no_verf;
3421 }
3422 *p++ = 0; /* no more entries */
3423 *p++ = htonl(readdir->common.err == nfserr_eof);
3424
3425 return 0;
3426 err_no_verf:
3427 xdr_truncate_encode(xdr, starting_len);
3428 return nfserr;
3429 }
3430
3431 static __be32
3432 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3433 {
3434 struct xdr_stream *xdr = &resp->xdr;
3435 __be32 *p;
3436
3437 if (!nfserr) {
3438 p = xdr_reserve_space(xdr, 20);
3439 if (!p)
3440 return nfserr_resource;
3441 p = encode_cinfo(p, &remove->rm_cinfo);
3442 }
3443 return nfserr;
3444 }
3445
3446 static __be32
3447 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3448 {
3449 struct xdr_stream *xdr = &resp->xdr;
3450 __be32 *p;
3451
3452 if (!nfserr) {
3453 p = xdr_reserve_space(xdr, 40);
3454 if (!p)
3455 return nfserr_resource;
3456 p = encode_cinfo(p, &rename->rn_sinfo);
3457 p = encode_cinfo(p, &rename->rn_tinfo);
3458 }
3459 return nfserr;
3460 }
3461
3462 static __be32
3463 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3464 __be32 nfserr, struct svc_export *exp)
3465 {
3466 u32 i, nflavs, supported;
3467 struct exp_flavor_info *flavs;
3468 struct exp_flavor_info def_flavs[2];
3469 __be32 *p, *flavorsp;
3470 static bool report = true;
3471
3472 if (nfserr)
3473 goto out;
3474 nfserr = nfserr_resource;
3475 if (exp->ex_nflavors) {
3476 flavs = exp->ex_flavors;
3477 nflavs = exp->ex_nflavors;
3478 } else { /* Handling of some defaults in absence of real secinfo: */
3479 flavs = def_flavs;
3480 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3481 nflavs = 2;
3482 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3483 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3484 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3485 nflavs = 1;
3486 flavs[0].pseudoflavor
3487 = svcauth_gss_flavor(exp->ex_client);
3488 } else {
3489 nflavs = 1;
3490 flavs[0].pseudoflavor
3491 = exp->ex_client->flavour->flavour;
3492 }
3493 }
3494
3495 supported = 0;
3496 p = xdr_reserve_space(xdr, 4);
3497 if (!p)
3498 goto out;
3499 flavorsp = p++; /* to be backfilled later */
3500
3501 for (i = 0; i < nflavs; i++) {
3502 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3503 struct rpcsec_gss_info info;
3504
3505 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3506 supported++;
3507 p = xdr_reserve_space(xdr, 4 + 4 +
3508 XDR_LEN(info.oid.len) + 4 + 4);
3509 if (!p)
3510 goto out;
3511 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3512 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3513 *p++ = cpu_to_be32(info.qop);
3514 *p++ = cpu_to_be32(info.service);
3515 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3516 supported++;
3517 p = xdr_reserve_space(xdr, 4);
3518 if (!p)
3519 goto out;
3520 *p++ = cpu_to_be32(pf);
3521 } else {
3522 if (report)
3523 pr_warn("NFS: SECINFO: security flavor %u "
3524 "is not supported\n", pf);
3525 }
3526 }
3527
3528 if (nflavs != supported)
3529 report = false;
3530 *flavorsp = htonl(supported);
3531 nfserr = 0;
3532 out:
3533 if (exp)
3534 exp_put(exp);
3535 return nfserr;
3536 }
3537
3538 static __be32
3539 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3540 struct nfsd4_secinfo *secinfo)
3541 {
3542 struct xdr_stream *xdr = &resp->xdr;
3543
3544 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3545 }
3546
3547 static __be32
3548 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3549 struct nfsd4_secinfo_no_name *secinfo)
3550 {
3551 struct xdr_stream *xdr = &resp->xdr;
3552
3553 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3554 }
3555
3556 /*
3557 * The SETATTR encode routine is special -- it always encodes a bitmap,
3558 * regardless of the error status.
3559 */
3560 static __be32
3561 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3562 {
3563 struct xdr_stream *xdr = &resp->xdr;
3564 __be32 *p;
3565
3566 p = xdr_reserve_space(xdr, 16);
3567 if (!p)
3568 return nfserr_resource;
3569 if (nfserr) {
3570 *p++ = cpu_to_be32(3);
3571 *p++ = cpu_to_be32(0);
3572 *p++ = cpu_to_be32(0);
3573 *p++ = cpu_to_be32(0);
3574 }
3575 else {
3576 *p++ = cpu_to_be32(3);
3577 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3578 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3579 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3580 }
3581 return nfserr;
3582 }
3583
3584 static __be32
3585 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3586 {
3587 struct xdr_stream *xdr = &resp->xdr;
3588 __be32 *p;
3589
3590 if (!nfserr) {
3591 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3592 if (!p)
3593 return nfserr_resource;
3594 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3595 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3596 NFS4_VERIFIER_SIZE);
3597 }
3598 else if (nfserr == nfserr_clid_inuse) {
3599 p = xdr_reserve_space(xdr, 8);
3600 if (!p)
3601 return nfserr_resource;
3602 *p++ = cpu_to_be32(0);
3603 *p++ = cpu_to_be32(0);
3604 }
3605 return nfserr;
3606 }
3607
3608 static __be32
3609 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3610 {
3611 struct xdr_stream *xdr = &resp->xdr;
3612 __be32 *p;
3613
3614 if (!nfserr) {
3615 p = xdr_reserve_space(xdr, 16);
3616 if (!p)
3617 return nfserr_resource;
3618 *p++ = cpu_to_be32(write->wr_bytes_written);
3619 *p++ = cpu_to_be32(write->wr_how_written);
3620 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3621 NFS4_VERIFIER_SIZE);
3622 }
3623 return nfserr;
3624 }
3625
3626 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3627 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3628 1 << (OP_EXCHANGE_ID - 32) |
3629 1 << (OP_CREATE_SESSION - 32) |
3630 1 << (OP_DESTROY_SESSION - 32) |
3631 1 << (OP_DESTROY_CLIENTID - 32)
3632 };
3633
3634 static __be32
3635 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3636 struct nfsd4_exchange_id *exid)
3637 {
3638 struct xdr_stream *xdr = &resp->xdr;
3639 __be32 *p;
3640 char *major_id;
3641 char *server_scope;
3642 int major_id_sz;
3643 int server_scope_sz;
3644 uint64_t minor_id = 0;
3645
3646 if (nfserr)
3647 return nfserr;
3648
3649 major_id = utsname()->nodename;
3650 major_id_sz = strlen(major_id);
3651 server_scope = utsname()->nodename;
3652 server_scope_sz = strlen(server_scope);
3653
3654 p = xdr_reserve_space(xdr,
3655 8 /* eir_clientid */ +
3656 4 /* eir_sequenceid */ +
3657 4 /* eir_flags */ +
3658 4 /* spr_how */);
3659 if (!p)
3660 return nfserr_resource;
3661
3662 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3663 *p++ = cpu_to_be32(exid->seqid);
3664 *p++ = cpu_to_be32(exid->flags);
3665
3666 *p++ = cpu_to_be32(exid->spa_how);
3667
3668 switch (exid->spa_how) {
3669 case SP4_NONE:
3670 break;
3671 case SP4_MACH_CRED:
3672 /* spo_must_enforce, spo_must_allow */
3673 p = xdr_reserve_space(xdr, 16);
3674 if (!p)
3675 return nfserr_resource;
3676
3677 /* spo_must_enforce bitmap: */
3678 *p++ = cpu_to_be32(2);
3679 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3680 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3681 /* empty spo_must_allow bitmap: */
3682 *p++ = cpu_to_be32(0);
3683
3684 break;
3685 default:
3686 WARN_ON_ONCE(1);
3687 }
3688
3689 p = xdr_reserve_space(xdr,
3690 8 /* so_minor_id */ +
3691 4 /* so_major_id.len */ +
3692 (XDR_QUADLEN(major_id_sz) * 4) +
3693 4 /* eir_server_scope.len */ +
3694 (XDR_QUADLEN(server_scope_sz) * 4) +
3695 4 /* eir_server_impl_id.count (0) */);
3696 if (!p)
3697 return nfserr_resource;
3698
3699 /* The server_owner struct */
3700 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3701 /* major id */
3702 p = xdr_encode_opaque(p, major_id, major_id_sz);
3703
3704 /* Server scope */
3705 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3706
3707 /* Implementation id */
3708 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3709 return 0;
3710 }
3711
3712 static __be32
3713 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3714 struct nfsd4_create_session *sess)
3715 {
3716 struct xdr_stream *xdr = &resp->xdr;
3717 __be32 *p;
3718
3719 if (nfserr)
3720 return nfserr;
3721
3722 p = xdr_reserve_space(xdr, 24);
3723 if (!p)
3724 return nfserr_resource;
3725 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3726 NFS4_MAX_SESSIONID_LEN);
3727 *p++ = cpu_to_be32(sess->seqid);
3728 *p++ = cpu_to_be32(sess->flags);
3729
3730 p = xdr_reserve_space(xdr, 28);
3731 if (!p)
3732 return nfserr_resource;
3733 *p++ = cpu_to_be32(0); /* headerpadsz */
3734 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3735 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3736 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3737 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3738 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3739 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3740
3741 if (sess->fore_channel.nr_rdma_attrs) {
3742 p = xdr_reserve_space(xdr, 4);
3743 if (!p)
3744 return nfserr_resource;
3745 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3746 }
3747
3748 p = xdr_reserve_space(xdr, 28);
3749 if (!p)
3750 return nfserr_resource;
3751 *p++ = cpu_to_be32(0); /* headerpadsz */
3752 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3753 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3754 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3755 *p++ = cpu_to_be32(sess->back_channel.maxops);
3756 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3757 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3758
3759 if (sess->back_channel.nr_rdma_attrs) {
3760 p = xdr_reserve_space(xdr, 4);
3761 if (!p)
3762 return nfserr_resource;
3763 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3764 }
3765 return 0;
3766 }
3767
3768 static __be32
3769 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3770 struct nfsd4_sequence *seq)
3771 {
3772 struct xdr_stream *xdr = &resp->xdr;
3773 __be32 *p;
3774
3775 if (nfserr)
3776 return nfserr;
3777
3778 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3779 if (!p)
3780 return nfserr_resource;
3781 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3782 NFS4_MAX_SESSIONID_LEN);
3783 *p++ = cpu_to_be32(seq->seqid);
3784 *p++ = cpu_to_be32(seq->slotid);
3785 /* Note slotid's are numbered from zero: */
3786 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3787 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3788 *p++ = cpu_to_be32(seq->status_flags);
3789
3790 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3791 return 0;
3792 }
3793
3794 static __be32
3795 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3796 struct nfsd4_test_stateid *test_stateid)
3797 {
3798 struct xdr_stream *xdr = &resp->xdr;
3799 struct nfsd4_test_stateid_id *stateid, *next;
3800 __be32 *p;
3801
3802 if (nfserr)
3803 return nfserr;
3804
3805 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3806 if (!p)
3807 return nfserr_resource;
3808 *p++ = htonl(test_stateid->ts_num_ids);
3809
3810 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3811 *p++ = stateid->ts_id_status;
3812 }
3813
3814 return nfserr;
3815 }
3816
3817 static __be32
3818 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3819 struct nfsd4_seek *seek)
3820 {
3821 __be32 *p;
3822
3823 if (nfserr)
3824 return nfserr;
3825
3826 p = xdr_reserve_space(&resp->xdr, 4 + 8);
3827 *p++ = cpu_to_be32(seek->seek_eof);
3828 p = xdr_encode_hyper(p, seek->seek_pos);
3829
3830 return nfserr;
3831 }
3832
3833 static __be32
3834 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3835 {
3836 return nfserr;
3837 }
3838
3839 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3840
3841 /*
3842 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3843 * since we don't need to filter out obsolete ops as this is
3844 * done in the decoding phase.
3845 */
3846 static nfsd4_enc nfsd4_enc_ops[] = {
3847 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3848 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3849 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3850 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3851 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3852 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3853 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3854 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3855 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3856 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3857 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3858 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3859 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3860 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3861 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3862 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3863 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3864 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3865 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3866 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3867 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3868 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3869 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3870 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3871 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3872 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3873 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3874 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3875 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3876 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3877 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3878 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3879 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3880 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3881 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3882 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3883 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3884
3885 /* NFSv4.1 operations */
3886 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3887 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3888 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3889 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3890 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3891 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3892 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3893 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3894 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3895 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3896 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3897 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3898 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3899 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3900 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3901 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3902 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3903 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3904 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3905
3906 /* NFSv4.2 operations */
3907 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3908 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
3909 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
3910 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3911 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
3912 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
3913 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
3914 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
3915 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
3916 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
3917 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
3918 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
3919 };
3920
3921 /*
3922 * Calculate whether we still have space to encode repsize bytes.
3923 * There are two considerations:
3924 * - For NFS versions >=4.1, the size of the reply must stay within
3925 * session limits
3926 * - For all NFS versions, we must stay within limited preallocated
3927 * buffer space.
3928 *
3929 * This is called before the operation is processed, so can only provide
3930 * an upper estimate. For some nonidempotent operations (such as
3931 * getattr), it's not necessarily a problem if that estimate is wrong,
3932 * as we can fail it after processing without significant side effects.
3933 */
3934 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3935 {
3936 struct xdr_buf *buf = &resp->rqstp->rq_res;
3937 struct nfsd4_slot *slot = resp->cstate.slot;
3938
3939 if (buf->len + respsize <= buf->buflen)
3940 return nfs_ok;
3941 if (!nfsd4_has_session(&resp->cstate))
3942 return nfserr_resource;
3943 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3944 WARN_ON_ONCE(1);
3945 return nfserr_rep_too_big_to_cache;
3946 }
3947 return nfserr_rep_too_big;
3948 }
3949
3950 void
3951 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3952 {
3953 struct xdr_stream *xdr = &resp->xdr;
3954 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3955 struct svc_rqst *rqstp = resp->rqstp;
3956 int post_err_offset;
3957 nfsd4_enc encoder;
3958 __be32 *p;
3959
3960 p = xdr_reserve_space(xdr, 8);
3961 if (!p) {
3962 WARN_ON_ONCE(1);
3963 return;
3964 }
3965 *p++ = cpu_to_be32(op->opnum);
3966 post_err_offset = xdr->buf->len;
3967
3968 if (op->opnum == OP_ILLEGAL)
3969 goto status;
3970 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3971 !nfsd4_enc_ops[op->opnum]);
3972 encoder = nfsd4_enc_ops[op->opnum];
3973 op->status = encoder(resp, op->status, &op->u);
3974 xdr_commit_encode(xdr);
3975
3976 /* nfsd4_check_resp_size guarantees enough room for error status */
3977 if (!op->status) {
3978 int space_needed = 0;
3979 if (!nfsd4_last_compound_op(rqstp))
3980 space_needed = COMPOUND_ERR_SLACK_SPACE;
3981 op->status = nfsd4_check_resp_size(resp, space_needed);
3982 }
3983 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3984 struct nfsd4_slot *slot = resp->cstate.slot;
3985
3986 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3987 op->status = nfserr_rep_too_big_to_cache;
3988 else
3989 op->status = nfserr_rep_too_big;
3990 }
3991 if (op->status == nfserr_resource ||
3992 op->status == nfserr_rep_too_big ||
3993 op->status == nfserr_rep_too_big_to_cache) {
3994 /*
3995 * The operation may have already been encoded or
3996 * partially encoded. No op returns anything additional
3997 * in the case of one of these three errors, so we can
3998 * just truncate back to after the status. But it's a
3999 * bug if we had to do this on a non-idempotent op:
4000 */
4001 warn_on_nonidempotent_op(op);
4002 xdr_truncate_encode(xdr, post_err_offset);
4003 }
4004 if (so) {
4005 int len = xdr->buf->len - post_err_offset;
4006
4007 so->so_replay.rp_status = op->status;
4008 so->so_replay.rp_buflen = len;
4009 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4010 so->so_replay.rp_buf, len);
4011 }
4012 status:
4013 /* Note that op->status is already in network byte order: */
4014 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4015 }
4016
4017 /*
4018 * Encode the reply stored in the stateowner reply cache
4019 *
4020 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4021 * previously sent already encoded operation.
4022 */
4023 void
4024 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4025 {
4026 __be32 *p;
4027 struct nfs4_replay *rp = op->replay;
4028
4029 BUG_ON(!rp);
4030
4031 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4032 if (!p) {
4033 WARN_ON_ONCE(1);
4034 return;
4035 }
4036 *p++ = cpu_to_be32(op->opnum);
4037 *p++ = rp->rp_status; /* already xdr'ed */
4038
4039 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4040 }
4041
4042 int
4043 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4044 {
4045 return xdr_ressize_check(rqstp, p);
4046 }
4047
4048 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4049 {
4050 struct svc_rqst *rqstp = rq;
4051 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4052
4053 if (args->ops != args->iops) {
4054 kfree(args->ops);
4055 args->ops = args->iops;
4056 }
4057 kfree(args->tmpp);
4058 args->tmpp = NULL;
4059 while (args->to_free) {
4060 struct svcxdr_tmpbuf *tb = args->to_free;
4061 args->to_free = tb->next;
4062 kfree(tb);
4063 }
4064 return 1;
4065 }
4066
4067 int
4068 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4069 {
4070 if (rqstp->rq_arg.head[0].iov_len % 4) {
4071 /* client is nuts */
4072 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4073 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4074 return 0;
4075 }
4076 args->p = p;
4077 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4078 args->pagelist = rqstp->rq_arg.pages;
4079 args->pagelen = rqstp->rq_arg.page_len;
4080 args->tmpp = NULL;
4081 args->to_free = NULL;
4082 args->ops = args->iops;
4083 args->rqstp = rqstp;
4084
4085 return !nfsd4_decode_compound(args);
4086 }
4087
4088 int
4089 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4090 {
4091 /*
4092 * All that remains is to write the tag and operation count...
4093 */
4094 struct xdr_buf *buf = resp->xdr.buf;
4095
4096 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4097 buf->tail[0].iov_len);
4098
4099 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4100
4101 p = resp->tagp;
4102 *p++ = htonl(resp->taglen);
4103 memcpy(p, resp->tag, resp->taglen);
4104 p += XDR_QUADLEN(resp->taglen);
4105 *p++ = htonl(resp->opcnt);
4106
4107 nfsd4_sequence_done(resp);
4108 return 1;
4109 }
4110
4111 /*
4112 * Local variables:
4113 * c-basic-offset: 8
4114 * End:
4115 */
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