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Merge tag 'xtensa-next-20141215' of git://github.com/czankel/xtensa-linux
[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_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1518 {
1519 DECODE_HEAD;
1520
1521 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1522 if (status)
1523 return status;
1524
1525 READ_BUF(8 + 4);
1526 p = xdr_decode_hyper(p, &seek->seek_offset);
1527 seek->seek_whence = be32_to_cpup(p);
1528
1529 DECODE_TAIL;
1530 }
1531
1532 static __be32
1533 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1534 {
1535 return nfs_ok;
1536 }
1537
1538 static __be32
1539 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1540 {
1541 return nfserr_notsupp;
1542 }
1543
1544 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1545
1546 static nfsd4_dec nfsd4_dec_ops[] = {
1547 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1548 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1549 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1550 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1551 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1552 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1553 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1554 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1555 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1556 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1557 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1558 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1559 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1560 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1561 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1562 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1563 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1564 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1565 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1566 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1567 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1568 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1569 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1570 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1571 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1572 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1573 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1574 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1575 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1576 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1577 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1578 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1579 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1580 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1581 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1582 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1583 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1584
1585 /* new operations for NFSv4.1 */
1586 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1587 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1588 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1589 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1590 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1591 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1592 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1593 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1594 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1595 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1596 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1597 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1598 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1599 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1600 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1601 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1602 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1603 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1604 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1605
1606 /* new operations for NFSv4.2 */
1607 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp,
1608 [OP_COPY] = (nfsd4_dec)nfsd4_decode_notsupp,
1609 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1610 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_notsupp,
1611 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1612 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1613 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1614 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1615 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1616 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1617 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1618 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1619 };
1620
1621 static inline bool
1622 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1623 {
1624 if (op->opnum < FIRST_NFS4_OP)
1625 return false;
1626 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1627 return false;
1628 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1629 return false;
1630 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1631 return false;
1632 return true;
1633 }
1634
1635 static __be32
1636 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1637 {
1638 DECODE_HEAD;
1639 struct nfsd4_op *op;
1640 bool cachethis = false;
1641 int auth_slack= argp->rqstp->rq_auth_slack;
1642 int max_reply = auth_slack + 8; /* opcnt, status */
1643 int readcount = 0;
1644 int readbytes = 0;
1645 int i;
1646
1647 READ_BUF(4);
1648 argp->taglen = be32_to_cpup(p++);
1649 READ_BUF(argp->taglen + 8);
1650 SAVEMEM(argp->tag, argp->taglen);
1651 argp->minorversion = be32_to_cpup(p++);
1652 argp->opcnt = be32_to_cpup(p++);
1653 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1654
1655 if (argp->taglen > NFSD4_MAX_TAGLEN)
1656 goto xdr_error;
1657 if (argp->opcnt > 100)
1658 goto xdr_error;
1659
1660 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1661 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1662 if (!argp->ops) {
1663 argp->ops = argp->iops;
1664 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1665 goto xdr_error;
1666 }
1667 }
1668
1669 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1670 argp->opcnt = 0;
1671
1672 for (i = 0; i < argp->opcnt; i++) {
1673 op = &argp->ops[i];
1674 op->replay = NULL;
1675
1676 READ_BUF(4);
1677 op->opnum = be32_to_cpup(p++);
1678
1679 if (nfsd4_opnum_in_range(argp, op))
1680 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1681 else {
1682 op->opnum = OP_ILLEGAL;
1683 op->status = nfserr_op_illegal;
1684 }
1685 /*
1686 * We'll try to cache the result in the DRC if any one
1687 * op in the compound wants to be cached:
1688 */
1689 cachethis |= nfsd4_cache_this_op(op);
1690
1691 if (op->opnum == OP_READ) {
1692 readcount++;
1693 readbytes += nfsd4_max_reply(argp->rqstp, op);
1694 } else
1695 max_reply += nfsd4_max_reply(argp->rqstp, op);
1696 /*
1697 * OP_LOCK may return a conflicting lock. (Special case
1698 * because it will just skip encoding this if it runs
1699 * out of xdr buffer space, and it is the only operation
1700 * that behaves this way.)
1701 */
1702 if (op->opnum == OP_LOCK)
1703 max_reply += NFS4_OPAQUE_LIMIT;
1704
1705 if (op->status) {
1706 argp->opcnt = i+1;
1707 break;
1708 }
1709 }
1710 /* Sessions make the DRC unnecessary: */
1711 if (argp->minorversion)
1712 cachethis = false;
1713 svc_reserve(argp->rqstp, max_reply + readbytes);
1714 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1715
1716 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1717 argp->rqstp->rq_splice_ok = false;
1718
1719 DECODE_TAIL;
1720 }
1721
1722 static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode)
1723 {
1724 if (IS_I_VERSION(inode)) {
1725 p = xdr_encode_hyper(p, inode->i_version);
1726 } else {
1727 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1728 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
1729 }
1730 return p;
1731 }
1732
1733 static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
1734 {
1735 *p++ = cpu_to_be32(c->atomic);
1736 if (c->change_supported) {
1737 p = xdr_encode_hyper(p, c->before_change);
1738 p = xdr_encode_hyper(p, c->after_change);
1739 } else {
1740 *p++ = cpu_to_be32(c->before_ctime_sec);
1741 *p++ = cpu_to_be32(c->before_ctime_nsec);
1742 *p++ = cpu_to_be32(c->after_ctime_sec);
1743 *p++ = cpu_to_be32(c->after_ctime_nsec);
1744 }
1745 return p;
1746 }
1747
1748 /* Encode as an array of strings the string given with components
1749 * separated @sep, escaped with esc_enter and esc_exit.
1750 */
1751 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
1752 char *components, char esc_enter,
1753 char esc_exit)
1754 {
1755 __be32 *p;
1756 __be32 pathlen;
1757 int pathlen_offset;
1758 int strlen, count=0;
1759 char *str, *end, *next;
1760
1761 dprintk("nfsd4_encode_components(%s)\n", components);
1762
1763 pathlen_offset = xdr->buf->len;
1764 p = xdr_reserve_space(xdr, 4);
1765 if (!p)
1766 return nfserr_resource;
1767 p++; /* We will fill this in with @count later */
1768
1769 end = str = components;
1770 while (*end) {
1771 bool found_esc = false;
1772
1773 /* try to parse as esc_start, ..., esc_end, sep */
1774 if (*str == esc_enter) {
1775 for (; *end && (*end != esc_exit); end++)
1776 /* find esc_exit or end of string */;
1777 next = end + 1;
1778 if (*end && (!*next || *next == sep)) {
1779 str++;
1780 found_esc = true;
1781 }
1782 }
1783
1784 if (!found_esc)
1785 for (; *end && (*end != sep); end++)
1786 /* find sep or end of string */;
1787
1788 strlen = end - str;
1789 if (strlen) {
1790 p = xdr_reserve_space(xdr, strlen + 4);
1791 if (!p)
1792 return nfserr_resource;
1793 p = xdr_encode_opaque(p, str, strlen);
1794 count++;
1795 }
1796 else
1797 end++;
1798 str = end;
1799 }
1800 pathlen = htonl(xdr->buf->len - pathlen_offset);
1801 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
1802 return 0;
1803 }
1804
1805 /* Encode as an array of strings the string given with components
1806 * separated @sep.
1807 */
1808 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
1809 char *components)
1810 {
1811 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
1812 }
1813
1814 /*
1815 * encode a location element of a fs_locations structure
1816 */
1817 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
1818 struct nfsd4_fs_location *location)
1819 {
1820 __be32 status;
1821
1822 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
1823 '[', ']');
1824 if (status)
1825 return status;
1826 status = nfsd4_encode_components(xdr, '/', location->path);
1827 if (status)
1828 return status;
1829 return 0;
1830 }
1831
1832 /*
1833 * Encode a path in RFC3530 'pathname4' format
1834 */
1835 static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
1836 const struct path *root,
1837 const struct path *path)
1838 {
1839 struct path cur = *path;
1840 __be32 *p;
1841 struct dentry **components = NULL;
1842 unsigned int ncomponents = 0;
1843 __be32 err = nfserr_jukebox;
1844
1845 dprintk("nfsd4_encode_components(");
1846
1847 path_get(&cur);
1848 /* First walk the path up to the nfsd root, and store the
1849 * dentries/path components in an array.
1850 */
1851 for (;;) {
1852 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1853 break;
1854 if (cur.dentry == cur.mnt->mnt_root) {
1855 if (follow_up(&cur))
1856 continue;
1857 goto out_free;
1858 }
1859 if ((ncomponents & 15) == 0) {
1860 struct dentry **new;
1861 new = krealloc(components,
1862 sizeof(*new) * (ncomponents + 16),
1863 GFP_KERNEL);
1864 if (!new)
1865 goto out_free;
1866 components = new;
1867 }
1868 components[ncomponents++] = cur.dentry;
1869 cur.dentry = dget_parent(cur.dentry);
1870 }
1871 err = nfserr_resource;
1872 p = xdr_reserve_space(xdr, 4);
1873 if (!p)
1874 goto out_free;
1875 *p++ = cpu_to_be32(ncomponents);
1876
1877 while (ncomponents) {
1878 struct dentry *dentry = components[ncomponents - 1];
1879 unsigned int len;
1880
1881 spin_lock(&dentry->d_lock);
1882 len = dentry->d_name.len;
1883 p = xdr_reserve_space(xdr, len + 4);
1884 if (!p) {
1885 spin_unlock(&dentry->d_lock);
1886 goto out_free;
1887 }
1888 p = xdr_encode_opaque(p, dentry->d_name.name, len);
1889 dprintk("/%pd", dentry);
1890 spin_unlock(&dentry->d_lock);
1891 dput(dentry);
1892 ncomponents--;
1893 }
1894
1895 err = 0;
1896 out_free:
1897 dprintk(")\n");
1898 while (ncomponents)
1899 dput(components[--ncomponents]);
1900 kfree(components);
1901 path_put(&cur);
1902 return err;
1903 }
1904
1905 static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
1906 struct svc_rqst *rqstp, const struct path *path)
1907 {
1908 struct svc_export *exp_ps;
1909 __be32 res;
1910
1911 exp_ps = rqst_find_fsidzero_export(rqstp);
1912 if (IS_ERR(exp_ps))
1913 return nfserrno(PTR_ERR(exp_ps));
1914 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
1915 exp_put(exp_ps);
1916 return res;
1917 }
1918
1919 /*
1920 * encode a fs_locations structure
1921 */
1922 static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
1923 struct svc_rqst *rqstp, struct svc_export *exp)
1924 {
1925 __be32 status;
1926 int i;
1927 __be32 *p;
1928 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1929
1930 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
1931 if (status)
1932 return status;
1933 p = xdr_reserve_space(xdr, 4);
1934 if (!p)
1935 return nfserr_resource;
1936 *p++ = cpu_to_be32(fslocs->locations_count);
1937 for (i=0; i<fslocs->locations_count; i++) {
1938 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
1939 if (status)
1940 return status;
1941 }
1942 return 0;
1943 }
1944
1945 static u32 nfs4_file_type(umode_t mode)
1946 {
1947 switch (mode & S_IFMT) {
1948 case S_IFIFO: return NF4FIFO;
1949 case S_IFCHR: return NF4CHR;
1950 case S_IFDIR: return NF4DIR;
1951 case S_IFBLK: return NF4BLK;
1952 case S_IFLNK: return NF4LNK;
1953 case S_IFREG: return NF4REG;
1954 case S_IFSOCK: return NF4SOCK;
1955 default: return NF4BAD;
1956 };
1957 }
1958
1959 static inline __be32
1960 nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1961 struct nfs4_ace *ace)
1962 {
1963 if (ace->whotype != NFS4_ACL_WHO_NAMED)
1964 return nfs4_acl_write_who(xdr, ace->whotype);
1965 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1966 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
1967 else
1968 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
1969 }
1970
1971 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1972 FATTR4_WORD0_RDATTR_ERROR)
1973 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1974
1975 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
1976 static inline __be32
1977 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1978 void *context, int len)
1979 {
1980 __be32 *p;
1981
1982 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
1983 if (!p)
1984 return nfserr_resource;
1985
1986 /*
1987 * For now we use a 0 here to indicate the null translation; in
1988 * the future we may place a call to translation code here.
1989 */
1990 *p++ = cpu_to_be32(0); /* lfs */
1991 *p++ = cpu_to_be32(0); /* pi */
1992 p = xdr_encode_opaque(p, context, len);
1993 return 0;
1994 }
1995 #else
1996 static inline __be32
1997 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
1998 void *context, int len)
1999 { return 0; }
2000 #endif
2001
2002 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2003 {
2004 /* As per referral draft: */
2005 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2006 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2007 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2008 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2009 *rdattr_err = NFSERR_MOVED;
2010 else
2011 return nfserr_moved;
2012 }
2013 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2014 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2015 return 0;
2016 }
2017
2018
2019 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2020 {
2021 struct path path = exp->ex_path;
2022 int err;
2023
2024 path_get(&path);
2025 while (follow_up(&path)) {
2026 if (path.dentry != path.mnt->mnt_root)
2027 break;
2028 }
2029 err = vfs_getattr(&path, stat);
2030 path_put(&path);
2031 return err;
2032 }
2033
2034 /*
2035 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2036 * ourselves.
2037 */
2038 static __be32
2039 nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2040 struct svc_export *exp,
2041 struct dentry *dentry, u32 *bmval,
2042 struct svc_rqst *rqstp, int ignore_crossmnt)
2043 {
2044 u32 bmval0 = bmval[0];
2045 u32 bmval1 = bmval[1];
2046 u32 bmval2 = bmval[2];
2047 struct kstat stat;
2048 struct svc_fh *tempfh = NULL;
2049 struct kstatfs statfs;
2050 __be32 *p;
2051 int starting_len = xdr->buf->len;
2052 int attrlen_offset;
2053 __be32 attrlen;
2054 u32 dummy;
2055 u64 dummy64;
2056 u32 rdattr_err = 0;
2057 __be32 status;
2058 int err;
2059 int aclsupport = 0;
2060 struct nfs4_acl *acl = NULL;
2061 void *context = NULL;
2062 int contextlen;
2063 bool contextsupport = false;
2064 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2065 u32 minorversion = resp->cstate.minorversion;
2066 struct path path = {
2067 .mnt = exp->ex_path.mnt,
2068 .dentry = dentry,
2069 };
2070 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2071
2072 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2073 BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2074 BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2075 BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2076
2077 if (exp->ex_fslocs.migrated) {
2078 BUG_ON(bmval[2]);
2079 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2080 if (status)
2081 goto out;
2082 }
2083
2084 err = vfs_getattr(&path, &stat);
2085 if (err)
2086 goto out_nfserr;
2087 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2088 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2089 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2090 FATTR4_WORD1_SPACE_TOTAL))) {
2091 err = vfs_statfs(&path, &statfs);
2092 if (err)
2093 goto out_nfserr;
2094 }
2095 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2096 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2097 status = nfserr_jukebox;
2098 if (!tempfh)
2099 goto out;
2100 fh_init(tempfh, NFS4_FHSIZE);
2101 status = fh_compose(tempfh, exp, dentry, NULL);
2102 if (status)
2103 goto out;
2104 fhp = tempfh;
2105 }
2106 if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2107 | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2108 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2109 aclsupport = (err == 0);
2110 if (bmval0 & FATTR4_WORD0_ACL) {
2111 if (err == -EOPNOTSUPP)
2112 bmval0 &= ~FATTR4_WORD0_ACL;
2113 else if (err == -EINVAL) {
2114 status = nfserr_attrnotsupp;
2115 goto out;
2116 } else if (err != 0)
2117 goto out_nfserr;
2118 }
2119 }
2120
2121 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2122 if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) ||
2123 bmval[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
2124 err = security_inode_getsecctx(dentry->d_inode,
2125 &context, &contextlen);
2126 contextsupport = (err == 0);
2127 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2128 if (err == -EOPNOTSUPP)
2129 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2130 else if (err)
2131 goto out_nfserr;
2132 }
2133 }
2134 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2135
2136 if (bmval2) {
2137 p = xdr_reserve_space(xdr, 16);
2138 if (!p)
2139 goto out_resource;
2140 *p++ = cpu_to_be32(3);
2141 *p++ = cpu_to_be32(bmval0);
2142 *p++ = cpu_to_be32(bmval1);
2143 *p++ = cpu_to_be32(bmval2);
2144 } else if (bmval1) {
2145 p = xdr_reserve_space(xdr, 12);
2146 if (!p)
2147 goto out_resource;
2148 *p++ = cpu_to_be32(2);
2149 *p++ = cpu_to_be32(bmval0);
2150 *p++ = cpu_to_be32(bmval1);
2151 } else {
2152 p = xdr_reserve_space(xdr, 8);
2153 if (!p)
2154 goto out_resource;
2155 *p++ = cpu_to_be32(1);
2156 *p++ = cpu_to_be32(bmval0);
2157 }
2158
2159 attrlen_offset = xdr->buf->len;
2160 p = xdr_reserve_space(xdr, 4);
2161 if (!p)
2162 goto out_resource;
2163 p++; /* to be backfilled later */
2164
2165 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2166 u32 word0 = nfsd_suppattrs0(minorversion);
2167 u32 word1 = nfsd_suppattrs1(minorversion);
2168 u32 word2 = nfsd_suppattrs2(minorversion);
2169
2170 if (!aclsupport)
2171 word0 &= ~FATTR4_WORD0_ACL;
2172 if (!contextsupport)
2173 word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2174 if (!word2) {
2175 p = xdr_reserve_space(xdr, 12);
2176 if (!p)
2177 goto out_resource;
2178 *p++ = cpu_to_be32(2);
2179 *p++ = cpu_to_be32(word0);
2180 *p++ = cpu_to_be32(word1);
2181 } else {
2182 p = xdr_reserve_space(xdr, 16);
2183 if (!p)
2184 goto out_resource;
2185 *p++ = cpu_to_be32(3);
2186 *p++ = cpu_to_be32(word0);
2187 *p++ = cpu_to_be32(word1);
2188 *p++ = cpu_to_be32(word2);
2189 }
2190 }
2191 if (bmval0 & FATTR4_WORD0_TYPE) {
2192 p = xdr_reserve_space(xdr, 4);
2193 if (!p)
2194 goto out_resource;
2195 dummy = nfs4_file_type(stat.mode);
2196 if (dummy == NF4BAD) {
2197 status = nfserr_serverfault;
2198 goto out;
2199 }
2200 *p++ = cpu_to_be32(dummy);
2201 }
2202 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2203 p = xdr_reserve_space(xdr, 4);
2204 if (!p)
2205 goto out_resource;
2206 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2207 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2208 else
2209 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2210 NFS4_FH_VOL_RENAME);
2211 }
2212 if (bmval0 & FATTR4_WORD0_CHANGE) {
2213 p = xdr_reserve_space(xdr, 8);
2214 if (!p)
2215 goto out_resource;
2216 p = encode_change(p, &stat, dentry->d_inode);
2217 }
2218 if (bmval0 & FATTR4_WORD0_SIZE) {
2219 p = xdr_reserve_space(xdr, 8);
2220 if (!p)
2221 goto out_resource;
2222 p = xdr_encode_hyper(p, stat.size);
2223 }
2224 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2225 p = xdr_reserve_space(xdr, 4);
2226 if (!p)
2227 goto out_resource;
2228 *p++ = cpu_to_be32(1);
2229 }
2230 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2231 p = xdr_reserve_space(xdr, 4);
2232 if (!p)
2233 goto out_resource;
2234 *p++ = cpu_to_be32(1);
2235 }
2236 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2237 p = xdr_reserve_space(xdr, 4);
2238 if (!p)
2239 goto out_resource;
2240 *p++ = cpu_to_be32(0);
2241 }
2242 if (bmval0 & FATTR4_WORD0_FSID) {
2243 p = xdr_reserve_space(xdr, 16);
2244 if (!p)
2245 goto out_resource;
2246 if (exp->ex_fslocs.migrated) {
2247 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2248 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2249 } else switch(fsid_source(fhp)) {
2250 case FSIDSOURCE_FSID:
2251 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2252 p = xdr_encode_hyper(p, (u64)0);
2253 break;
2254 case FSIDSOURCE_DEV:
2255 *p++ = cpu_to_be32(0);
2256 *p++ = cpu_to_be32(MAJOR(stat.dev));
2257 *p++ = cpu_to_be32(0);
2258 *p++ = cpu_to_be32(MINOR(stat.dev));
2259 break;
2260 case FSIDSOURCE_UUID:
2261 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2262 EX_UUID_LEN);
2263 break;
2264 }
2265 }
2266 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2267 p = xdr_reserve_space(xdr, 4);
2268 if (!p)
2269 goto out_resource;
2270 *p++ = cpu_to_be32(0);
2271 }
2272 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2273 p = xdr_reserve_space(xdr, 4);
2274 if (!p)
2275 goto out_resource;
2276 *p++ = cpu_to_be32(nn->nfsd4_lease);
2277 }
2278 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2279 p = xdr_reserve_space(xdr, 4);
2280 if (!p)
2281 goto out_resource;
2282 *p++ = cpu_to_be32(rdattr_err);
2283 }
2284 if (bmval0 & FATTR4_WORD0_ACL) {
2285 struct nfs4_ace *ace;
2286
2287 if (acl == NULL) {
2288 p = xdr_reserve_space(xdr, 4);
2289 if (!p)
2290 goto out_resource;
2291
2292 *p++ = cpu_to_be32(0);
2293 goto out_acl;
2294 }
2295 p = xdr_reserve_space(xdr, 4);
2296 if (!p)
2297 goto out_resource;
2298 *p++ = cpu_to_be32(acl->naces);
2299
2300 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2301 p = xdr_reserve_space(xdr, 4*3);
2302 if (!p)
2303 goto out_resource;
2304 *p++ = cpu_to_be32(ace->type);
2305 *p++ = cpu_to_be32(ace->flag);
2306 *p++ = cpu_to_be32(ace->access_mask &
2307 NFS4_ACE_MASK_ALL);
2308 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2309 if (status)
2310 goto out;
2311 }
2312 }
2313 out_acl:
2314 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2315 p = xdr_reserve_space(xdr, 4);
2316 if (!p)
2317 goto out_resource;
2318 *p++ = cpu_to_be32(aclsupport ?
2319 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2320 }
2321 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2322 p = xdr_reserve_space(xdr, 4);
2323 if (!p)
2324 goto out_resource;
2325 *p++ = cpu_to_be32(1);
2326 }
2327 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2328 p = xdr_reserve_space(xdr, 4);
2329 if (!p)
2330 goto out_resource;
2331 *p++ = cpu_to_be32(0);
2332 }
2333 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2334 p = xdr_reserve_space(xdr, 4);
2335 if (!p)
2336 goto out_resource;
2337 *p++ = cpu_to_be32(1);
2338 }
2339 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2340 p = xdr_reserve_space(xdr, 4);
2341 if (!p)
2342 goto out_resource;
2343 *p++ = cpu_to_be32(1);
2344 }
2345 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2346 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2347 if (!p)
2348 goto out_resource;
2349 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2350 fhp->fh_handle.fh_size);
2351 }
2352 if (bmval0 & FATTR4_WORD0_FILEID) {
2353 p = xdr_reserve_space(xdr, 8);
2354 if (!p)
2355 goto out_resource;
2356 p = xdr_encode_hyper(p, stat.ino);
2357 }
2358 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2359 p = xdr_reserve_space(xdr, 8);
2360 if (!p)
2361 goto out_resource;
2362 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2363 }
2364 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2365 p = xdr_reserve_space(xdr, 8);
2366 if (!p)
2367 goto out_resource;
2368 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2369 }
2370 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2371 p = xdr_reserve_space(xdr, 8);
2372 if (!p)
2373 goto out_resource;
2374 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2375 }
2376 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2377 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2378 if (status)
2379 goto out;
2380 }
2381 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2382 p = xdr_reserve_space(xdr, 4);
2383 if (!p)
2384 goto out_resource;
2385 *p++ = cpu_to_be32(1);
2386 }
2387 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2388 p = xdr_reserve_space(xdr, 8);
2389 if (!p)
2390 goto out_resource;
2391 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2392 }
2393 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2394 p = xdr_reserve_space(xdr, 4);
2395 if (!p)
2396 goto out_resource;
2397 *p++ = cpu_to_be32(255);
2398 }
2399 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2400 p = xdr_reserve_space(xdr, 4);
2401 if (!p)
2402 goto out_resource;
2403 *p++ = cpu_to_be32(statfs.f_namelen);
2404 }
2405 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2406 p = xdr_reserve_space(xdr, 8);
2407 if (!p)
2408 goto out_resource;
2409 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2410 }
2411 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2412 p = xdr_reserve_space(xdr, 8);
2413 if (!p)
2414 goto out_resource;
2415 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2416 }
2417 if (bmval1 & FATTR4_WORD1_MODE) {
2418 p = xdr_reserve_space(xdr, 4);
2419 if (!p)
2420 goto out_resource;
2421 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2422 }
2423 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2424 p = xdr_reserve_space(xdr, 4);
2425 if (!p)
2426 goto out_resource;
2427 *p++ = cpu_to_be32(1);
2428 }
2429 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2430 p = xdr_reserve_space(xdr, 4);
2431 if (!p)
2432 goto out_resource;
2433 *p++ = cpu_to_be32(stat.nlink);
2434 }
2435 if (bmval1 & FATTR4_WORD1_OWNER) {
2436 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2437 if (status)
2438 goto out;
2439 }
2440 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2441 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2442 if (status)
2443 goto out;
2444 }
2445 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2446 p = xdr_reserve_space(xdr, 8);
2447 if (!p)
2448 goto out_resource;
2449 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2450 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2451 }
2452 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2453 p = xdr_reserve_space(xdr, 8);
2454 if (!p)
2455 goto out_resource;
2456 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2457 p = xdr_encode_hyper(p, dummy64);
2458 }
2459 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2460 p = xdr_reserve_space(xdr, 8);
2461 if (!p)
2462 goto out_resource;
2463 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2464 p = xdr_encode_hyper(p, dummy64);
2465 }
2466 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2467 p = xdr_reserve_space(xdr, 8);
2468 if (!p)
2469 goto out_resource;
2470 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2471 p = xdr_encode_hyper(p, dummy64);
2472 }
2473 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2474 p = xdr_reserve_space(xdr, 8);
2475 if (!p)
2476 goto out_resource;
2477 dummy64 = (u64)stat.blocks << 9;
2478 p = xdr_encode_hyper(p, dummy64);
2479 }
2480 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2481 p = xdr_reserve_space(xdr, 12);
2482 if (!p)
2483 goto out_resource;
2484 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2485 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2486 }
2487 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2488 p = xdr_reserve_space(xdr, 12);
2489 if (!p)
2490 goto out_resource;
2491 *p++ = cpu_to_be32(0);
2492 *p++ = cpu_to_be32(1);
2493 *p++ = cpu_to_be32(0);
2494 }
2495 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2496 p = xdr_reserve_space(xdr, 12);
2497 if (!p)
2498 goto out_resource;
2499 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2500 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2501 }
2502 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2503 p = xdr_reserve_space(xdr, 12);
2504 if (!p)
2505 goto out_resource;
2506 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2507 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2508 }
2509 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2510 p = xdr_reserve_space(xdr, 8);
2511 if (!p)
2512 goto out_resource;
2513 /*
2514 * Get parent's attributes if not ignoring crossmount
2515 * and this is the root of a cross-mounted filesystem.
2516 */
2517 if (ignore_crossmnt == 0 &&
2518 dentry == exp->ex_path.mnt->mnt_root)
2519 get_parent_attributes(exp, &stat);
2520 p = xdr_encode_hyper(p, stat.ino);
2521 }
2522 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2523 status = nfsd4_encode_security_label(xdr, rqstp, context,
2524 contextlen);
2525 if (status)
2526 goto out;
2527 }
2528 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2529 p = xdr_reserve_space(xdr, 16);
2530 if (!p)
2531 goto out_resource;
2532 *p++ = cpu_to_be32(3);
2533 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2534 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2535 *p++ = cpu_to_be32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2536 }
2537
2538 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2539 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2540 status = nfs_ok;
2541
2542 out:
2543 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2544 if (context)
2545 security_release_secctx(context, contextlen);
2546 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2547 kfree(acl);
2548 if (tempfh) {
2549 fh_put(tempfh);
2550 kfree(tempfh);
2551 }
2552 if (status)
2553 xdr_truncate_encode(xdr, starting_len);
2554 return status;
2555 out_nfserr:
2556 status = nfserrno(err);
2557 goto out;
2558 out_resource:
2559 status = nfserr_resource;
2560 goto out;
2561 }
2562
2563 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2564 struct xdr_buf *buf, __be32 *p, int bytes)
2565 {
2566 xdr->scratch.iov_len = 0;
2567 memset(buf, 0, sizeof(struct xdr_buf));
2568 buf->head[0].iov_base = p;
2569 buf->head[0].iov_len = 0;
2570 buf->len = 0;
2571 xdr->buf = buf;
2572 xdr->iov = buf->head;
2573 xdr->p = p;
2574 xdr->end = (void *)p + bytes;
2575 buf->buflen = bytes;
2576 }
2577
2578 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2579 struct svc_fh *fhp, struct svc_export *exp,
2580 struct dentry *dentry, u32 *bmval,
2581 struct svc_rqst *rqstp, int ignore_crossmnt)
2582 {
2583 struct xdr_buf dummy;
2584 struct xdr_stream xdr;
2585 __be32 ret;
2586
2587 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2588 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2589 ignore_crossmnt);
2590 *p = xdr.p;
2591 return ret;
2592 }
2593
2594 static inline int attributes_need_mount(u32 *bmval)
2595 {
2596 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2597 return 1;
2598 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2599 return 1;
2600 return 0;
2601 }
2602
2603 static __be32
2604 nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2605 const char *name, int namlen)
2606 {
2607 struct svc_export *exp = cd->rd_fhp->fh_export;
2608 struct dentry *dentry;
2609 __be32 nfserr;
2610 int ignore_crossmnt = 0;
2611
2612 dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2613 if (IS_ERR(dentry))
2614 return nfserrno(PTR_ERR(dentry));
2615 if (!dentry->d_inode) {
2616 /*
2617 * nfsd_buffered_readdir drops the i_mutex between
2618 * readdir and calling this callback, leaving a window
2619 * where this directory entry could have gone away.
2620 */
2621 dput(dentry);
2622 return nfserr_noent;
2623 }
2624
2625 exp_get(exp);
2626 /*
2627 * In the case of a mountpoint, the client may be asking for
2628 * attributes that are only properties of the underlying filesystem
2629 * as opposed to the cross-mounted file system. In such a case,
2630 * we will not follow the cross mount and will fill the attribtutes
2631 * directly from the mountpoint dentry.
2632 */
2633 if (nfsd_mountpoint(dentry, exp)) {
2634 int err;
2635
2636 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2637 && !attributes_need_mount(cd->rd_bmval)) {
2638 ignore_crossmnt = 1;
2639 goto out_encode;
2640 }
2641 /*
2642 * Why the heck aren't we just using nfsd_lookup??
2643 * Different "."/".." handling? Something else?
2644 * At least, add a comment here to explain....
2645 */
2646 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2647 if (err) {
2648 nfserr = nfserrno(err);
2649 goto out_put;
2650 }
2651 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2652 if (nfserr)
2653 goto out_put;
2654
2655 }
2656 out_encode:
2657 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2658 cd->rd_rqstp, ignore_crossmnt);
2659 out_put:
2660 dput(dentry);
2661 exp_put(exp);
2662 return nfserr;
2663 }
2664
2665 static __be32 *
2666 nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
2667 {
2668 __be32 *p;
2669
2670 p = xdr_reserve_space(xdr, 20);
2671 if (!p)
2672 return NULL;
2673 *p++ = htonl(2);
2674 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2675 *p++ = htonl(0); /* bmval1 */
2676
2677 *p++ = htonl(4); /* attribute length */
2678 *p++ = nfserr; /* no htonl */
2679 return p;
2680 }
2681
2682 static int
2683 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2684 loff_t offset, u64 ino, unsigned int d_type)
2685 {
2686 struct readdir_cd *ccd = ccdv;
2687 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2688 struct xdr_stream *xdr = cd->xdr;
2689 int start_offset = xdr->buf->len;
2690 int cookie_offset;
2691 u32 name_and_cookie;
2692 int entry_bytes;
2693 __be32 nfserr = nfserr_toosmall;
2694 __be64 wire_offset;
2695 __be32 *p;
2696
2697 /* In nfsv4, "." and ".." never make it onto the wire.. */
2698 if (name && isdotent(name, namlen)) {
2699 cd->common.err = nfs_ok;
2700 return 0;
2701 }
2702
2703 if (cd->cookie_offset) {
2704 wire_offset = cpu_to_be64(offset);
2705 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
2706 &wire_offset, 8);
2707 }
2708
2709 p = xdr_reserve_space(xdr, 4);
2710 if (!p)
2711 goto fail;
2712 *p++ = xdr_one; /* mark entry present */
2713 cookie_offset = xdr->buf->len;
2714 p = xdr_reserve_space(xdr, 3*4 + namlen);
2715 if (!p)
2716 goto fail;
2717 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
2718 p = xdr_encode_array(p, name, namlen); /* name length & name */
2719
2720 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
2721 switch (nfserr) {
2722 case nfs_ok:
2723 break;
2724 case nfserr_resource:
2725 nfserr = nfserr_toosmall;
2726 goto fail;
2727 case nfserr_noent:
2728 xdr_truncate_encode(xdr, start_offset);
2729 goto skip_entry;
2730 default:
2731 /*
2732 * If the client requested the RDATTR_ERROR attribute,
2733 * we stuff the error code into this attribute
2734 * and continue. If this attribute was not requested,
2735 * then in accordance with the spec, we fail the
2736 * entire READDIR operation(!)
2737 */
2738 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2739 goto fail;
2740 p = nfsd4_encode_rdattr_error(xdr, nfserr);
2741 if (p == NULL) {
2742 nfserr = nfserr_toosmall;
2743 goto fail;
2744 }
2745 }
2746 nfserr = nfserr_toosmall;
2747 entry_bytes = xdr->buf->len - start_offset;
2748 if (entry_bytes > cd->rd_maxcount)
2749 goto fail;
2750 cd->rd_maxcount -= entry_bytes;
2751 if (!cd->rd_dircount)
2752 goto fail;
2753 /*
2754 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
2755 * let's always let through the first entry, at least:
2756 */
2757 name_and_cookie = 4 * XDR_QUADLEN(namlen) + 8;
2758 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
2759 goto fail;
2760 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
2761 cd->cookie_offset = cookie_offset;
2762 skip_entry:
2763 cd->common.err = nfs_ok;
2764 return 0;
2765 fail:
2766 xdr_truncate_encode(xdr, start_offset);
2767 cd->common.err = nfserr;
2768 return -EINVAL;
2769 }
2770
2771 static __be32
2772 nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
2773 {
2774 __be32 *p;
2775
2776 p = xdr_reserve_space(xdr, sizeof(stateid_t));
2777 if (!p)
2778 return nfserr_resource;
2779 *p++ = cpu_to_be32(sid->si_generation);
2780 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
2781 sizeof(stateid_opaque_t));
2782 return 0;
2783 }
2784
2785 static __be32
2786 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2787 {
2788 struct xdr_stream *xdr = &resp->xdr;
2789 __be32 *p;
2790
2791 if (!nfserr) {
2792 p = xdr_reserve_space(xdr, 8);
2793 if (!p)
2794 return nfserr_resource;
2795 *p++ = cpu_to_be32(access->ac_supported);
2796 *p++ = cpu_to_be32(access->ac_resp_access);
2797 }
2798 return nfserr;
2799 }
2800
2801 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2802 {
2803 struct xdr_stream *xdr = &resp->xdr;
2804 __be32 *p;
2805
2806 if (!nfserr) {
2807 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
2808 if (!p)
2809 return nfserr_resource;
2810 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
2811 NFS4_MAX_SESSIONID_LEN);
2812 *p++ = cpu_to_be32(bcts->dir);
2813 /* Sorry, we do not yet support RDMA over 4.1: */
2814 *p++ = cpu_to_be32(0);
2815 }
2816 return nfserr;
2817 }
2818
2819 static __be32
2820 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2821 {
2822 struct xdr_stream *xdr = &resp->xdr;
2823
2824 if (!nfserr)
2825 nfserr = nfsd4_encode_stateid(xdr, &close->cl_stateid);
2826
2827 return nfserr;
2828 }
2829
2830
2831 static __be32
2832 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2833 {
2834 struct xdr_stream *xdr = &resp->xdr;
2835 __be32 *p;
2836
2837 if (!nfserr) {
2838 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
2839 if (!p)
2840 return nfserr_resource;
2841 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
2842 NFS4_VERIFIER_SIZE);
2843 }
2844 return nfserr;
2845 }
2846
2847 static __be32
2848 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2849 {
2850 struct xdr_stream *xdr = &resp->xdr;
2851 __be32 *p;
2852
2853 if (!nfserr) {
2854 p = xdr_reserve_space(xdr, 32);
2855 if (!p)
2856 return nfserr_resource;
2857 p = encode_cinfo(p, &create->cr_cinfo);
2858 *p++ = cpu_to_be32(2);
2859 *p++ = cpu_to_be32(create->cr_bmval[0]);
2860 *p++ = cpu_to_be32(create->cr_bmval[1]);
2861 }
2862 return nfserr;
2863 }
2864
2865 static __be32
2866 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2867 {
2868 struct svc_fh *fhp = getattr->ga_fhp;
2869 struct xdr_stream *xdr = &resp->xdr;
2870
2871 if (nfserr)
2872 return nfserr;
2873
2874 nfserr = nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
2875 getattr->ga_bmval,
2876 resp->rqstp, 0);
2877 return nfserr;
2878 }
2879
2880 static __be32
2881 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2882 {
2883 struct xdr_stream *xdr = &resp->xdr;
2884 struct svc_fh *fhp = *fhpp;
2885 unsigned int len;
2886 __be32 *p;
2887
2888 if (!nfserr) {
2889 len = fhp->fh_handle.fh_size;
2890 p = xdr_reserve_space(xdr, len + 4);
2891 if (!p)
2892 return nfserr_resource;
2893 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
2894 }
2895 return nfserr;
2896 }
2897
2898 /*
2899 * Including all fields other than the name, a LOCK4denied structure requires
2900 * 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2901 */
2902 static __be32
2903 nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
2904 {
2905 struct xdr_netobj *conf = &ld->ld_owner;
2906 __be32 *p;
2907
2908 again:
2909 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
2910 if (!p) {
2911 /*
2912 * Don't fail to return the result just because we can't
2913 * return the conflicting open:
2914 */
2915 if (conf->len) {
2916 kfree(conf->data);
2917 conf->len = 0;
2918 conf->data = NULL;
2919 goto again;
2920 }
2921 return nfserr_resource;
2922 }
2923 p = xdr_encode_hyper(p, ld->ld_start);
2924 p = xdr_encode_hyper(p, ld->ld_length);
2925 *p++ = cpu_to_be32(ld->ld_type);
2926 if (conf->len) {
2927 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
2928 p = xdr_encode_opaque(p, conf->data, conf->len);
2929 kfree(conf->data);
2930 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
2931 p = xdr_encode_hyper(p, (u64)0); /* clientid */
2932 *p++ = cpu_to_be32(0); /* length of owner name */
2933 }
2934 return nfserr_denied;
2935 }
2936
2937 static __be32
2938 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2939 {
2940 struct xdr_stream *xdr = &resp->xdr;
2941
2942 if (!nfserr)
2943 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
2944 else if (nfserr == nfserr_denied)
2945 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
2946
2947 return nfserr;
2948 }
2949
2950 static __be32
2951 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2952 {
2953 struct xdr_stream *xdr = &resp->xdr;
2954
2955 if (nfserr == nfserr_denied)
2956 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
2957 return nfserr;
2958 }
2959
2960 static __be32
2961 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2962 {
2963 struct xdr_stream *xdr = &resp->xdr;
2964
2965 if (!nfserr)
2966 nfserr = nfsd4_encode_stateid(xdr, &locku->lu_stateid);
2967
2968 return nfserr;
2969 }
2970
2971
2972 static __be32
2973 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2974 {
2975 struct xdr_stream *xdr = &resp->xdr;
2976 __be32 *p;
2977
2978 if (!nfserr) {
2979 p = xdr_reserve_space(xdr, 20);
2980 if (!p)
2981 return nfserr_resource;
2982 p = encode_cinfo(p, &link->li_cinfo);
2983 }
2984 return nfserr;
2985 }
2986
2987
2988 static __be32
2989 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2990 {
2991 struct xdr_stream *xdr = &resp->xdr;
2992 __be32 *p;
2993
2994 if (nfserr)
2995 goto out;
2996
2997 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
2998 if (nfserr)
2999 goto out;
3000 p = xdr_reserve_space(xdr, 40);
3001 if (!p)
3002 return nfserr_resource;
3003 p = encode_cinfo(p, &open->op_cinfo);
3004 *p++ = cpu_to_be32(open->op_rflags);
3005 *p++ = cpu_to_be32(2);
3006 *p++ = cpu_to_be32(open->op_bmval[0]);
3007 *p++ = cpu_to_be32(open->op_bmval[1]);
3008 *p++ = cpu_to_be32(open->op_delegate_type);
3009
3010 switch (open->op_delegate_type) {
3011 case NFS4_OPEN_DELEGATE_NONE:
3012 break;
3013 case NFS4_OPEN_DELEGATE_READ:
3014 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3015 if (nfserr)
3016 return nfserr;
3017 p = xdr_reserve_space(xdr, 20);
3018 if (!p)
3019 return nfserr_resource;
3020 *p++ = cpu_to_be32(open->op_recall);
3021
3022 /*
3023 * TODO: ACE's in delegations
3024 */
3025 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3026 *p++ = cpu_to_be32(0);
3027 *p++ = cpu_to_be32(0);
3028 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3029 break;
3030 case NFS4_OPEN_DELEGATE_WRITE:
3031 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3032 if (nfserr)
3033 return nfserr;
3034 p = xdr_reserve_space(xdr, 32);
3035 if (!p)
3036 return nfserr_resource;
3037 *p++ = cpu_to_be32(0);
3038
3039 /*
3040 * TODO: space_limit's in delegations
3041 */
3042 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3043 *p++ = cpu_to_be32(~(u32)0);
3044 *p++ = cpu_to_be32(~(u32)0);
3045
3046 /*
3047 * TODO: ACE's in delegations
3048 */
3049 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3050 *p++ = cpu_to_be32(0);
3051 *p++ = cpu_to_be32(0);
3052 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3053 break;
3054 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3055 switch (open->op_why_no_deleg) {
3056 case WND4_CONTENTION:
3057 case WND4_RESOURCE:
3058 p = xdr_reserve_space(xdr, 8);
3059 if (!p)
3060 return nfserr_resource;
3061 *p++ = cpu_to_be32(open->op_why_no_deleg);
3062 /* deleg signaling not supported yet: */
3063 *p++ = cpu_to_be32(0);
3064 break;
3065 default:
3066 p = xdr_reserve_space(xdr, 4);
3067 if (!p)
3068 return nfserr_resource;
3069 *p++ = cpu_to_be32(open->op_why_no_deleg);
3070 }
3071 break;
3072 default:
3073 BUG();
3074 }
3075 /* XXX save filehandle here */
3076 out:
3077 return nfserr;
3078 }
3079
3080 static __be32
3081 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3082 {
3083 struct xdr_stream *xdr = &resp->xdr;
3084
3085 if (!nfserr)
3086 nfserr = nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3087
3088 return nfserr;
3089 }
3090
3091 static __be32
3092 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3093 {
3094 struct xdr_stream *xdr = &resp->xdr;
3095
3096 if (!nfserr)
3097 nfserr = nfsd4_encode_stateid(xdr, &od->od_stateid);
3098
3099 return nfserr;
3100 }
3101
3102 static __be32 nfsd4_encode_splice_read(
3103 struct nfsd4_compoundres *resp,
3104 struct nfsd4_read *read,
3105 struct file *file, unsigned long maxcount)
3106 {
3107 struct xdr_stream *xdr = &resp->xdr;
3108 struct xdr_buf *buf = xdr->buf;
3109 u32 eof;
3110 int space_left;
3111 __be32 nfserr;
3112 __be32 *p = xdr->p - 2;
3113
3114 /* Make sure there will be room for padding if needed */
3115 if (xdr->end - xdr->p < 1)
3116 return nfserr_resource;
3117
3118 nfserr = nfsd_splice_read(read->rd_rqstp, file,
3119 read->rd_offset, &maxcount);
3120 if (nfserr) {
3121 /*
3122 * nfsd_splice_actor may have already messed with the
3123 * page length; reset it so as not to confuse
3124 * xdr_truncate_encode:
3125 */
3126 buf->page_len = 0;
3127 return nfserr;
3128 }
3129
3130 eof = (read->rd_offset + maxcount >=
3131 read->rd_fhp->fh_dentry->d_inode->i_size);
3132
3133 *(p++) = htonl(eof);
3134 *(p++) = htonl(maxcount);
3135
3136 buf->page_len = maxcount;
3137 buf->len += maxcount;
3138 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3139 / PAGE_SIZE;
3140
3141 /* Use rest of head for padding and remaining ops: */
3142 buf->tail[0].iov_base = xdr->p;
3143 buf->tail[0].iov_len = 0;
3144 xdr->iov = buf->tail;
3145 if (maxcount&3) {
3146 int pad = 4 - (maxcount&3);
3147
3148 *(xdr->p++) = 0;
3149
3150 buf->tail[0].iov_base += maxcount&3;
3151 buf->tail[0].iov_len = pad;
3152 buf->len += pad;
3153 }
3154
3155 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3156 buf->buflen - buf->len);
3157 buf->buflen = buf->len + space_left;
3158 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3159
3160 return 0;
3161 }
3162
3163 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3164 struct nfsd4_read *read,
3165 struct file *file, unsigned long maxcount)
3166 {
3167 struct xdr_stream *xdr = &resp->xdr;
3168 u32 eof;
3169 int v;
3170 int starting_len = xdr->buf->len - 8;
3171 long len;
3172 int thislen;
3173 __be32 nfserr;
3174 __be32 tmp;
3175 __be32 *p;
3176 u32 zzz = 0;
3177 int pad;
3178
3179 len = maxcount;
3180 v = 0;
3181
3182 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3183 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3184 WARN_ON_ONCE(!p);
3185 resp->rqstp->rq_vec[v].iov_base = p;
3186 resp->rqstp->rq_vec[v].iov_len = thislen;
3187 v++;
3188 len -= thislen;
3189
3190 while (len) {
3191 thislen = min_t(long, len, PAGE_SIZE);
3192 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3193 WARN_ON_ONCE(!p);
3194 resp->rqstp->rq_vec[v].iov_base = p;
3195 resp->rqstp->rq_vec[v].iov_len = thislen;
3196 v++;
3197 len -= thislen;
3198 }
3199 read->rd_vlen = v;
3200
3201 nfserr = nfsd_readv(file, read->rd_offset, resp->rqstp->rq_vec,
3202 read->rd_vlen, &maxcount);
3203 if (nfserr)
3204 return nfserr;
3205 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3206
3207 eof = (read->rd_offset + maxcount >=
3208 read->rd_fhp->fh_dentry->d_inode->i_size);
3209
3210 tmp = htonl(eof);
3211 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3212 tmp = htonl(maxcount);
3213 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3214
3215 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3216 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3217 &zzz, pad);
3218 return 0;
3219
3220 }
3221
3222 static __be32
3223 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3224 struct nfsd4_read *read)
3225 {
3226 unsigned long maxcount;
3227 struct xdr_stream *xdr = &resp->xdr;
3228 struct file *file = read->rd_filp;
3229 int starting_len = xdr->buf->len;
3230 struct raparms *ra;
3231 __be32 *p;
3232 __be32 err;
3233
3234 if (nfserr)
3235 return nfserr;
3236
3237 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3238 if (!p) {
3239 WARN_ON_ONCE(resp->rqstp->rq_splice_ok);
3240 return nfserr_resource;
3241 }
3242 if (resp->xdr.buf->page_len && resp->rqstp->rq_splice_ok) {
3243 WARN_ON_ONCE(1);
3244 return nfserr_resource;
3245 }
3246 xdr_commit_encode(xdr);
3247
3248 maxcount = svc_max_payload(resp->rqstp);
3249 maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
3250 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3251
3252 if (!read->rd_filp) {
3253 err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
3254 &file, &ra);
3255 if (err)
3256 goto err_truncate;
3257 }
3258
3259 if (file->f_op->splice_read && resp->rqstp->rq_splice_ok)
3260 err = nfsd4_encode_splice_read(resp, read, file, maxcount);
3261 else
3262 err = nfsd4_encode_readv(resp, read, file, maxcount);
3263
3264 if (!read->rd_filp)
3265 nfsd_put_tmp_read_open(file, ra);
3266
3267 err_truncate:
3268 if (err)
3269 xdr_truncate_encode(xdr, starting_len);
3270 return err;
3271 }
3272
3273 static __be32
3274 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3275 {
3276 int maxcount;
3277 __be32 wire_count;
3278 int zero = 0;
3279 struct xdr_stream *xdr = &resp->xdr;
3280 int length_offset = xdr->buf->len;
3281 __be32 *p;
3282
3283 if (nfserr)
3284 return nfserr;
3285
3286 p = xdr_reserve_space(xdr, 4);
3287 if (!p)
3288 return nfserr_resource;
3289 maxcount = PAGE_SIZE;
3290
3291 p = xdr_reserve_space(xdr, maxcount);
3292 if (!p)
3293 return nfserr_resource;
3294 /*
3295 * XXX: By default, the ->readlink() VFS op will truncate symlinks
3296 * if they would overflow the buffer. Is this kosher in NFSv4? If
3297 * not, one easy fix is: if ->readlink() precisely fills the buffer,
3298 * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3299 */
3300 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3301 (char *)p, &maxcount);
3302 if (nfserr == nfserr_isdir)
3303 nfserr = nfserr_inval;
3304 if (nfserr) {
3305 xdr_truncate_encode(xdr, length_offset);
3306 return nfserr;
3307 }
3308
3309 wire_count = htonl(maxcount);
3310 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3311 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3312 if (maxcount & 3)
3313 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3314 &zero, 4 - (maxcount&3));
3315 return 0;
3316 }
3317
3318 static __be32
3319 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3320 {
3321 int maxcount;
3322 int bytes_left;
3323 loff_t offset;
3324 __be64 wire_offset;
3325 struct xdr_stream *xdr = &resp->xdr;
3326 int starting_len = xdr->buf->len;
3327 __be32 *p;
3328
3329 if (nfserr)
3330 return nfserr;
3331
3332 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3333 if (!p)
3334 return nfserr_resource;
3335
3336 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3337 *p++ = cpu_to_be32(0);
3338 *p++ = cpu_to_be32(0);
3339 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3340 - (char *)resp->xdr.buf->head[0].iov_base;
3341
3342 /*
3343 * Number of bytes left for directory entries allowing for the
3344 * final 8 bytes of the readdir and a following failed op:
3345 */
3346 bytes_left = xdr->buf->buflen - xdr->buf->len
3347 - COMPOUND_ERR_SLACK_SPACE - 8;
3348 if (bytes_left < 0) {
3349 nfserr = nfserr_resource;
3350 goto err_no_verf;
3351 }
3352 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3353 /*
3354 * Note the rfc defines rd_maxcount as the size of the
3355 * READDIR4resok structure, which includes the verifier above
3356 * and the 8 bytes encoded at the end of this function:
3357 */
3358 if (maxcount < 16) {
3359 nfserr = nfserr_toosmall;
3360 goto err_no_verf;
3361 }
3362 maxcount = min_t(int, maxcount-16, bytes_left);
3363
3364 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3365 if (!readdir->rd_dircount)
3366 readdir->rd_dircount = INT_MAX;
3367
3368 readdir->xdr = xdr;
3369 readdir->rd_maxcount = maxcount;
3370 readdir->common.err = 0;
3371 readdir->cookie_offset = 0;
3372
3373 offset = readdir->rd_cookie;
3374 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3375 &offset,
3376 &readdir->common, nfsd4_encode_dirent);
3377 if (nfserr == nfs_ok &&
3378 readdir->common.err == nfserr_toosmall &&
3379 xdr->buf->len == starting_len + 8) {
3380 /* nothing encoded; which limit did we hit?: */
3381 if (maxcount - 16 < bytes_left)
3382 /* It was the fault of rd_maxcount: */
3383 nfserr = nfserr_toosmall;
3384 else
3385 /* We ran out of buffer space: */
3386 nfserr = nfserr_resource;
3387 }
3388 if (nfserr)
3389 goto err_no_verf;
3390
3391 if (readdir->cookie_offset) {
3392 wire_offset = cpu_to_be64(offset);
3393 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3394 &wire_offset, 8);
3395 }
3396
3397 p = xdr_reserve_space(xdr, 8);
3398 if (!p) {
3399 WARN_ON_ONCE(1);
3400 goto err_no_verf;
3401 }
3402 *p++ = 0; /* no more entries */
3403 *p++ = htonl(readdir->common.err == nfserr_eof);
3404
3405 return 0;
3406 err_no_verf:
3407 xdr_truncate_encode(xdr, starting_len);
3408 return nfserr;
3409 }
3410
3411 static __be32
3412 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3413 {
3414 struct xdr_stream *xdr = &resp->xdr;
3415 __be32 *p;
3416
3417 if (!nfserr) {
3418 p = xdr_reserve_space(xdr, 20);
3419 if (!p)
3420 return nfserr_resource;
3421 p = encode_cinfo(p, &remove->rm_cinfo);
3422 }
3423 return nfserr;
3424 }
3425
3426 static __be32
3427 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3428 {
3429 struct xdr_stream *xdr = &resp->xdr;
3430 __be32 *p;
3431
3432 if (!nfserr) {
3433 p = xdr_reserve_space(xdr, 40);
3434 if (!p)
3435 return nfserr_resource;
3436 p = encode_cinfo(p, &rename->rn_sinfo);
3437 p = encode_cinfo(p, &rename->rn_tinfo);
3438 }
3439 return nfserr;
3440 }
3441
3442 static __be32
3443 nfsd4_do_encode_secinfo(struct xdr_stream *xdr,
3444 __be32 nfserr, struct svc_export *exp)
3445 {
3446 u32 i, nflavs, supported;
3447 struct exp_flavor_info *flavs;
3448 struct exp_flavor_info def_flavs[2];
3449 __be32 *p, *flavorsp;
3450 static bool report = true;
3451
3452 if (nfserr)
3453 goto out;
3454 nfserr = nfserr_resource;
3455 if (exp->ex_nflavors) {
3456 flavs = exp->ex_flavors;
3457 nflavs = exp->ex_nflavors;
3458 } else { /* Handling of some defaults in absence of real secinfo: */
3459 flavs = def_flavs;
3460 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3461 nflavs = 2;
3462 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3463 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3464 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3465 nflavs = 1;
3466 flavs[0].pseudoflavor
3467 = svcauth_gss_flavor(exp->ex_client);
3468 } else {
3469 nflavs = 1;
3470 flavs[0].pseudoflavor
3471 = exp->ex_client->flavour->flavour;
3472 }
3473 }
3474
3475 supported = 0;
3476 p = xdr_reserve_space(xdr, 4);
3477 if (!p)
3478 goto out;
3479 flavorsp = p++; /* to be backfilled later */
3480
3481 for (i = 0; i < nflavs; i++) {
3482 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3483 struct rpcsec_gss_info info;
3484
3485 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3486 supported++;
3487 p = xdr_reserve_space(xdr, 4 + 4 +
3488 XDR_LEN(info.oid.len) + 4 + 4);
3489 if (!p)
3490 goto out;
3491 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3492 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3493 *p++ = cpu_to_be32(info.qop);
3494 *p++ = cpu_to_be32(info.service);
3495 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3496 supported++;
3497 p = xdr_reserve_space(xdr, 4);
3498 if (!p)
3499 goto out;
3500 *p++ = cpu_to_be32(pf);
3501 } else {
3502 if (report)
3503 pr_warn("NFS: SECINFO: security flavor %u "
3504 "is not supported\n", pf);
3505 }
3506 }
3507
3508 if (nflavs != supported)
3509 report = false;
3510 *flavorsp = htonl(supported);
3511 nfserr = 0;
3512 out:
3513 if (exp)
3514 exp_put(exp);
3515 return nfserr;
3516 }
3517
3518 static __be32
3519 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3520 struct nfsd4_secinfo *secinfo)
3521 {
3522 struct xdr_stream *xdr = &resp->xdr;
3523
3524 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->si_exp);
3525 }
3526
3527 static __be32
3528 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3529 struct nfsd4_secinfo_no_name *secinfo)
3530 {
3531 struct xdr_stream *xdr = &resp->xdr;
3532
3533 return nfsd4_do_encode_secinfo(xdr, nfserr, secinfo->sin_exp);
3534 }
3535
3536 /*
3537 * The SETATTR encode routine is special -- it always encodes a bitmap,
3538 * regardless of the error status.
3539 */
3540 static __be32
3541 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3542 {
3543 struct xdr_stream *xdr = &resp->xdr;
3544 __be32 *p;
3545
3546 p = xdr_reserve_space(xdr, 16);
3547 if (!p)
3548 return nfserr_resource;
3549 if (nfserr) {
3550 *p++ = cpu_to_be32(3);
3551 *p++ = cpu_to_be32(0);
3552 *p++ = cpu_to_be32(0);
3553 *p++ = cpu_to_be32(0);
3554 }
3555 else {
3556 *p++ = cpu_to_be32(3);
3557 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3558 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3559 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3560 }
3561 return nfserr;
3562 }
3563
3564 static __be32
3565 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3566 {
3567 struct xdr_stream *xdr = &resp->xdr;
3568 __be32 *p;
3569
3570 if (!nfserr) {
3571 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3572 if (!p)
3573 return nfserr_resource;
3574 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3575 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3576 NFS4_VERIFIER_SIZE);
3577 }
3578 else if (nfserr == nfserr_clid_inuse) {
3579 p = xdr_reserve_space(xdr, 8);
3580 if (!p)
3581 return nfserr_resource;
3582 *p++ = cpu_to_be32(0);
3583 *p++ = cpu_to_be32(0);
3584 }
3585 return nfserr;
3586 }
3587
3588 static __be32
3589 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3590 {
3591 struct xdr_stream *xdr = &resp->xdr;
3592 __be32 *p;
3593
3594 if (!nfserr) {
3595 p = xdr_reserve_space(xdr, 16);
3596 if (!p)
3597 return nfserr_resource;
3598 *p++ = cpu_to_be32(write->wr_bytes_written);
3599 *p++ = cpu_to_be32(write->wr_how_written);
3600 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3601 NFS4_VERIFIER_SIZE);
3602 }
3603 return nfserr;
3604 }
3605
3606 static const u32 nfs4_minimal_spo_must_enforce[2] = {
3607 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3608 1 << (OP_EXCHANGE_ID - 32) |
3609 1 << (OP_CREATE_SESSION - 32) |
3610 1 << (OP_DESTROY_SESSION - 32) |
3611 1 << (OP_DESTROY_CLIENTID - 32)
3612 };
3613
3614 static __be32
3615 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3616 struct nfsd4_exchange_id *exid)
3617 {
3618 struct xdr_stream *xdr = &resp->xdr;
3619 __be32 *p;
3620 char *major_id;
3621 char *server_scope;
3622 int major_id_sz;
3623 int server_scope_sz;
3624 uint64_t minor_id = 0;
3625
3626 if (nfserr)
3627 return nfserr;
3628
3629 major_id = utsname()->nodename;
3630 major_id_sz = strlen(major_id);
3631 server_scope = utsname()->nodename;
3632 server_scope_sz = strlen(server_scope);
3633
3634 p = xdr_reserve_space(xdr,
3635 8 /* eir_clientid */ +
3636 4 /* eir_sequenceid */ +
3637 4 /* eir_flags */ +
3638 4 /* spr_how */);
3639 if (!p)
3640 return nfserr_resource;
3641
3642 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3643 *p++ = cpu_to_be32(exid->seqid);
3644 *p++ = cpu_to_be32(exid->flags);
3645
3646 *p++ = cpu_to_be32(exid->spa_how);
3647
3648 switch (exid->spa_how) {
3649 case SP4_NONE:
3650 break;
3651 case SP4_MACH_CRED:
3652 /* spo_must_enforce, spo_must_allow */
3653 p = xdr_reserve_space(xdr, 16);
3654 if (!p)
3655 return nfserr_resource;
3656
3657 /* spo_must_enforce bitmap: */
3658 *p++ = cpu_to_be32(2);
3659 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[0]);
3660 *p++ = cpu_to_be32(nfs4_minimal_spo_must_enforce[1]);
3661 /* empty spo_must_allow bitmap: */
3662 *p++ = cpu_to_be32(0);
3663
3664 break;
3665 default:
3666 WARN_ON_ONCE(1);
3667 }
3668
3669 p = xdr_reserve_space(xdr,
3670 8 /* so_minor_id */ +
3671 4 /* so_major_id.len */ +
3672 (XDR_QUADLEN(major_id_sz) * 4) +
3673 4 /* eir_server_scope.len */ +
3674 (XDR_QUADLEN(server_scope_sz) * 4) +
3675 4 /* eir_server_impl_id.count (0) */);
3676 if (!p)
3677 return nfserr_resource;
3678
3679 /* The server_owner struct */
3680 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3681 /* major id */
3682 p = xdr_encode_opaque(p, major_id, major_id_sz);
3683
3684 /* Server scope */
3685 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3686
3687 /* Implementation id */
3688 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3689 return 0;
3690 }
3691
3692 static __be32
3693 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3694 struct nfsd4_create_session *sess)
3695 {
3696 struct xdr_stream *xdr = &resp->xdr;
3697 __be32 *p;
3698
3699 if (nfserr)
3700 return nfserr;
3701
3702 p = xdr_reserve_space(xdr, 24);
3703 if (!p)
3704 return nfserr_resource;
3705 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3706 NFS4_MAX_SESSIONID_LEN);
3707 *p++ = cpu_to_be32(sess->seqid);
3708 *p++ = cpu_to_be32(sess->flags);
3709
3710 p = xdr_reserve_space(xdr, 28);
3711 if (!p)
3712 return nfserr_resource;
3713 *p++ = cpu_to_be32(0); /* headerpadsz */
3714 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3715 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3716 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3717 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3718 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3719 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3720
3721 if (sess->fore_channel.nr_rdma_attrs) {
3722 p = xdr_reserve_space(xdr, 4);
3723 if (!p)
3724 return nfserr_resource;
3725 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
3726 }
3727
3728 p = xdr_reserve_space(xdr, 28);
3729 if (!p)
3730 return nfserr_resource;
3731 *p++ = cpu_to_be32(0); /* headerpadsz */
3732 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
3733 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
3734 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
3735 *p++ = cpu_to_be32(sess->back_channel.maxops);
3736 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
3737 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
3738
3739 if (sess->back_channel.nr_rdma_attrs) {
3740 p = xdr_reserve_space(xdr, 4);
3741 if (!p)
3742 return nfserr_resource;
3743 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
3744 }
3745 return 0;
3746 }
3747
3748 static __be32
3749 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3750 struct nfsd4_sequence *seq)
3751 {
3752 struct xdr_stream *xdr = &resp->xdr;
3753 __be32 *p;
3754
3755 if (nfserr)
3756 return nfserr;
3757
3758 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
3759 if (!p)
3760 return nfserr_resource;
3761 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
3762 NFS4_MAX_SESSIONID_LEN);
3763 *p++ = cpu_to_be32(seq->seqid);
3764 *p++ = cpu_to_be32(seq->slotid);
3765 /* Note slotid's are numbered from zero: */
3766 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
3767 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
3768 *p++ = cpu_to_be32(seq->status_flags);
3769
3770 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
3771 return 0;
3772 }
3773
3774 static __be32
3775 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3776 struct nfsd4_test_stateid *test_stateid)
3777 {
3778 struct xdr_stream *xdr = &resp->xdr;
3779 struct nfsd4_test_stateid_id *stateid, *next;
3780 __be32 *p;
3781
3782 if (nfserr)
3783 return nfserr;
3784
3785 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
3786 if (!p)
3787 return nfserr_resource;
3788 *p++ = htonl(test_stateid->ts_num_ids);
3789
3790 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3791 *p++ = stateid->ts_id_status;
3792 }
3793
3794 return nfserr;
3795 }
3796
3797 static __be32
3798 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
3799 struct nfsd4_seek *seek)
3800 {
3801 __be32 *p;
3802
3803 if (nfserr)
3804 return nfserr;
3805
3806 p = xdr_reserve_space(&resp->xdr, 4 + 8);
3807 *p++ = cpu_to_be32(seek->seek_eof);
3808 p = xdr_encode_hyper(p, seek->seek_pos);
3809
3810 return nfserr;
3811 }
3812
3813 static __be32
3814 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3815 {
3816 return nfserr;
3817 }
3818
3819 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3820
3821 /*
3822 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3823 * since we don't need to filter out obsolete ops as this is
3824 * done in the decoding phase.
3825 */
3826 static nfsd4_enc nfsd4_enc_ops[] = {
3827 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
3828 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
3829 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
3830 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
3831 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
3832 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3833 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
3834 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
3835 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
3836 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
3837 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
3838 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
3839 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
3840 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
3841 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3842 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
3843 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
3844 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
3845 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
3846 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
3847 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
3848 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
3849 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
3850 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
3851 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
3852 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
3853 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
3854 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
3855 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
3856 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
3857 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
3858 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
3859 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
3860 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3861 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
3862 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
3863 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
3864
3865 /* NFSv4.1 operations */
3866 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
3867 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3868 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
3869 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
3870 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3871 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
3872 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3873 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
3874 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
3875 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
3876 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
3877 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
3878 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3879 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
3880 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
3881 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
3882 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3883 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
3884 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
3885
3886 /* NFSv4.2 operations */
3887 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3888 [OP_COPY] = (nfsd4_enc)nfsd4_encode_noop,
3889 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
3890 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
3891 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
3892 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
3893 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
3894 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
3895 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
3896 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
3897 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
3898 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
3899 };
3900
3901 /*
3902 * Calculate whether we still have space to encode repsize bytes.
3903 * There are two considerations:
3904 * - For NFS versions >=4.1, the size of the reply must stay within
3905 * session limits
3906 * - For all NFS versions, we must stay within limited preallocated
3907 * buffer space.
3908 *
3909 * This is called before the operation is processed, so can only provide
3910 * an upper estimate. For some nonidempotent operations (such as
3911 * getattr), it's not necessarily a problem if that estimate is wrong,
3912 * as we can fail it after processing without significant side effects.
3913 */
3914 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
3915 {
3916 struct xdr_buf *buf = &resp->rqstp->rq_res;
3917 struct nfsd4_slot *slot = resp->cstate.slot;
3918
3919 if (buf->len + respsize <= buf->buflen)
3920 return nfs_ok;
3921 if (!nfsd4_has_session(&resp->cstate))
3922 return nfserr_resource;
3923 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
3924 WARN_ON_ONCE(1);
3925 return nfserr_rep_too_big_to_cache;
3926 }
3927 return nfserr_rep_too_big;
3928 }
3929
3930 void
3931 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3932 {
3933 struct xdr_stream *xdr = &resp->xdr;
3934 struct nfs4_stateowner *so = resp->cstate.replay_owner;
3935 struct svc_rqst *rqstp = resp->rqstp;
3936 int post_err_offset;
3937 nfsd4_enc encoder;
3938 __be32 *p;
3939
3940 p = xdr_reserve_space(xdr, 8);
3941 if (!p) {
3942 WARN_ON_ONCE(1);
3943 return;
3944 }
3945 *p++ = cpu_to_be32(op->opnum);
3946 post_err_offset = xdr->buf->len;
3947
3948 if (op->opnum == OP_ILLEGAL)
3949 goto status;
3950 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3951 !nfsd4_enc_ops[op->opnum]);
3952 encoder = nfsd4_enc_ops[op->opnum];
3953 op->status = encoder(resp, op->status, &op->u);
3954 xdr_commit_encode(xdr);
3955
3956 /* nfsd4_check_resp_size guarantees enough room for error status */
3957 if (!op->status) {
3958 int space_needed = 0;
3959 if (!nfsd4_last_compound_op(rqstp))
3960 space_needed = COMPOUND_ERR_SLACK_SPACE;
3961 op->status = nfsd4_check_resp_size(resp, space_needed);
3962 }
3963 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
3964 struct nfsd4_slot *slot = resp->cstate.slot;
3965
3966 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
3967 op->status = nfserr_rep_too_big_to_cache;
3968 else
3969 op->status = nfserr_rep_too_big;
3970 }
3971 if (op->status == nfserr_resource ||
3972 op->status == nfserr_rep_too_big ||
3973 op->status == nfserr_rep_too_big_to_cache) {
3974 /*
3975 * The operation may have already been encoded or
3976 * partially encoded. No op returns anything additional
3977 * in the case of one of these three errors, so we can
3978 * just truncate back to after the status. But it's a
3979 * bug if we had to do this on a non-idempotent op:
3980 */
3981 warn_on_nonidempotent_op(op);
3982 xdr_truncate_encode(xdr, post_err_offset);
3983 }
3984 if (so) {
3985 int len = xdr->buf->len - post_err_offset;
3986
3987 so->so_replay.rp_status = op->status;
3988 so->so_replay.rp_buflen = len;
3989 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
3990 so->so_replay.rp_buf, len);
3991 }
3992 status:
3993 /* Note that op->status is already in network byte order: */
3994 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
3995 }
3996
3997 /*
3998 * Encode the reply stored in the stateowner reply cache
3999 *
4000 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4001 * previously sent already encoded operation.
4002 */
4003 void
4004 nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4005 {
4006 __be32 *p;
4007 struct nfs4_replay *rp = op->replay;
4008
4009 BUG_ON(!rp);
4010
4011 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4012 if (!p) {
4013 WARN_ON_ONCE(1);
4014 return;
4015 }
4016 *p++ = cpu_to_be32(op->opnum);
4017 *p++ = rp->rp_status; /* already xdr'ed */
4018
4019 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4020 }
4021
4022 int
4023 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
4024 {
4025 return xdr_ressize_check(rqstp, p);
4026 }
4027
4028 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
4029 {
4030 struct svc_rqst *rqstp = rq;
4031 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4032
4033 if (args->ops != args->iops) {
4034 kfree(args->ops);
4035 args->ops = args->iops;
4036 }
4037 kfree(args->tmpp);
4038 args->tmpp = NULL;
4039 while (args->to_free) {
4040 struct svcxdr_tmpbuf *tb = args->to_free;
4041 args->to_free = tb->next;
4042 kfree(tb);
4043 }
4044 return 1;
4045 }
4046
4047 int
4048 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
4049 {
4050 if (rqstp->rq_arg.head[0].iov_len % 4) {
4051 /* client is nuts */
4052 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4053 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4054 return 0;
4055 }
4056 args->p = p;
4057 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4058 args->pagelist = rqstp->rq_arg.pages;
4059 args->pagelen = rqstp->rq_arg.page_len;
4060 args->tmpp = NULL;
4061 args->to_free = NULL;
4062 args->ops = args->iops;
4063 args->rqstp = rqstp;
4064
4065 return !nfsd4_decode_compound(args);
4066 }
4067
4068 int
4069 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
4070 {
4071 /*
4072 * All that remains is to write the tag and operation count...
4073 */
4074 struct xdr_buf *buf = resp->xdr.buf;
4075
4076 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4077 buf->tail[0].iov_len);
4078
4079 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4080
4081 p = resp->tagp;
4082 *p++ = htonl(resp->taglen);
4083 memcpy(p, resp->tag, resp->taglen);
4084 p += XDR_QUADLEN(resp->taglen);
4085 *p++ = htonl(resp->opcnt);
4086
4087 nfsd4_sequence_done(resp);
4088 return 1;
4089 }
4090
4091 /*
4092 * Local variables:
4093 * c-basic-offset: 8
4094 * End:
4095 */
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