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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/callback_xdr.c
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback encode/decode procedures
8 */
9#include <linux/kernel.h>
10#include <linux/sunrpc/svc.h>
11#include <linux/nfs4.h>
12#include <linux/nfs_fs.h>
13#include <linux/ratelimit.h>
14#include <linux/printk.h>
15#include <linux/slab.h>
16#include <linux/sunrpc/bc_xprt.h>
17#include "nfs4_fs.h"
18#include "callback.h"
19#include "internal.h"
20#include "nfs4session.h"
21
22#define CB_OP_TAGLEN_MAXSZ (512)
23#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
24#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
25#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
26 CB_OP_GETATTR_BITMAP_MAXSZ + \
27 /* change, size, ctime, mtime */\
28 (2 + 2 + 3 + 3) * 4)
29#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30
31#if defined(CONFIG_NFS_V4_1)
32#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
35 NFS4_MAX_SESSIONID_LEN + \
36 (1 + 3) * 4) // seqid, 3 slotids
37#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40#endif /* CONFIG_NFS_V4_1 */
41#ifdef CONFIG_NFS_V4_2
42#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
43#endif /* CONFIG_NFS_V4_2 */
44
45#define NFSDBG_FACILITY NFSDBG_CALLBACK
46
47/* Internal error code */
48#define NFS4ERR_RESOURCE_HDR 11050
49
50struct callback_op {
51 __be32 (*process_op)(void *, void *, struct cb_process_state *);
52 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
53 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
54 const void *);
55 long res_maxsize;
56};
57
58static struct callback_op callback_ops[];
59
60static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
61{
62 return htonl(NFS4_OK);
63}
64
65static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
66{
67 return xdr_argsize_check(rqstp, p);
68}
69
70static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
71{
72 return xdr_ressize_check(rqstp, p);
73}
74
75static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
76 const char **str, size_t maxlen)
77{
78 ssize_t err;
79
80 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
81 if (err < 0)
82 return cpu_to_be32(NFS4ERR_RESOURCE);
83 *len = err;
84 return 0;
85}
86
87static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
88{
89 __be32 *p;
90
91 p = xdr_inline_decode(xdr, 4);
92 if (unlikely(p == NULL))
93 return htonl(NFS4ERR_RESOURCE);
94 fh->size = ntohl(*p);
95 if (fh->size > NFS4_FHSIZE)
96 return htonl(NFS4ERR_BADHANDLE);
97 p = xdr_inline_decode(xdr, fh->size);
98 if (unlikely(p == NULL))
99 return htonl(NFS4ERR_RESOURCE);
100 memcpy(&fh->data[0], p, fh->size);
101 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
102 return 0;
103}
104
105static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
106{
107 __be32 *p;
108 unsigned int attrlen;
109
110 p = xdr_inline_decode(xdr, 4);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 attrlen = ntohl(*p);
114 p = xdr_inline_decode(xdr, attrlen << 2);
115 if (unlikely(p == NULL))
116 return htonl(NFS4ERR_RESOURCE);
117 if (likely(attrlen > 0))
118 bitmap[0] = ntohl(*p++);
119 if (attrlen > 1)
120 bitmap[1] = ntohl(*p);
121 return 0;
122}
123
124static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
125{
126 __be32 *p;
127
128 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
129 if (unlikely(p == NULL))
130 return htonl(NFS4ERR_RESOURCE);
131 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
132 return 0;
133}
134
135static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
136{
137 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
138 return decode_stateid(xdr, stateid);
139}
140
141static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
142{
143 __be32 *p;
144 __be32 status;
145
146 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
147 if (unlikely(status != 0))
148 return status;
149 p = xdr_inline_decode(xdr, 12);
150 if (unlikely(p == NULL))
151 return htonl(NFS4ERR_RESOURCE);
152 hdr->minorversion = ntohl(*p++);
153 /* Check for minor version support */
154 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
155 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
156 } else {
157 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
158 "illegal minor version %u!\n",
159 __func__, hdr->minorversion);
160 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
161 }
162 hdr->nops = ntohl(*p);
163 return 0;
164}
165
166static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
167{
168 __be32 *p;
169 p = xdr_inline_decode(xdr, 4);
170 if (unlikely(p == NULL))
171 return htonl(NFS4ERR_RESOURCE_HDR);
172 *op = ntohl(*p);
173 return 0;
174}
175
176static __be32 decode_getattr_args(struct svc_rqst *rqstp,
177 struct xdr_stream *xdr, void *argp)
178{
179 struct cb_getattrargs *args = argp;
180 __be32 status;
181
182 status = decode_fh(xdr, &args->fh);
183 if (unlikely(status != 0))
184 return status;
185 return decode_bitmap(xdr, args->bitmap);
186}
187
188static __be32 decode_recall_args(struct svc_rqst *rqstp,
189 struct xdr_stream *xdr, void *argp)
190{
191 struct cb_recallargs *args = argp;
192 __be32 *p;
193 __be32 status;
194
195 status = decode_delegation_stateid(xdr, &args->stateid);
196 if (unlikely(status != 0))
197 return status;
198 p = xdr_inline_decode(xdr, 4);
199 if (unlikely(p == NULL))
200 return htonl(NFS4ERR_RESOURCE);
201 args->truncate = ntohl(*p);
202 return decode_fh(xdr, &args->fh);
203}
204
205#if defined(CONFIG_NFS_V4_1)
206static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
207{
208 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
209 return decode_stateid(xdr, stateid);
210}
211
212static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
213 struct xdr_stream *xdr, void *argp)
214{
215 struct cb_layoutrecallargs *args = argp;
216 __be32 *p;
217 __be32 status = 0;
218 uint32_t iomode;
219
220 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
221 if (unlikely(p == NULL))
222 return htonl(NFS4ERR_BADXDR);
223
224 args->cbl_layout_type = ntohl(*p++);
225 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
226 * as it is unusable and ignored with the other types.
227 */
228 iomode = ntohl(*p++);
229 args->cbl_layoutchanged = ntohl(*p++);
230 args->cbl_recall_type = ntohl(*p++);
231
232 if (args->cbl_recall_type == RETURN_FILE) {
233 args->cbl_range.iomode = iomode;
234 status = decode_fh(xdr, &args->cbl_fh);
235 if (unlikely(status != 0))
236 return status;
237
238 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
239 if (unlikely(p == NULL))
240 return htonl(NFS4ERR_BADXDR);
241 p = xdr_decode_hyper(p, &args->cbl_range.offset);
242 p = xdr_decode_hyper(p, &args->cbl_range.length);
243 return decode_layout_stateid(xdr, &args->cbl_stateid);
244 } else if (args->cbl_recall_type == RETURN_FSID) {
245 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
246 if (unlikely(p == NULL))
247 return htonl(NFS4ERR_BADXDR);
248 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
249 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
250 } else if (args->cbl_recall_type != RETURN_ALL)
251 return htonl(NFS4ERR_BADXDR);
252 return 0;
253}
254
255static
256__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
257 struct xdr_stream *xdr,
258 void *argp)
259{
260 struct cb_devicenotifyargs *args = argp;
261 __be32 *p;
262 __be32 status = 0;
263 u32 tmp;
264 int n, i;
265 args->ndevs = 0;
266
267 /* Num of device notifications */
268 p = xdr_inline_decode(xdr, sizeof(uint32_t));
269 if (unlikely(p == NULL)) {
270 status = htonl(NFS4ERR_BADXDR);
271 goto out;
272 }
273 n = ntohl(*p++);
274 if (n <= 0)
275 goto out;
276 if (n > ULONG_MAX / sizeof(*args->devs)) {
277 status = htonl(NFS4ERR_BADXDR);
278 goto out;
279 }
280
281 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
282 if (!args->devs) {
283 status = htonl(NFS4ERR_DELAY);
284 goto out;
285 }
286
287 /* Decode each dev notification */
288 for (i = 0; i < n; i++) {
289 struct cb_devicenotifyitem *dev = &args->devs[i];
290
291 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
292 NFS4_DEVICEID4_SIZE);
293 if (unlikely(p == NULL)) {
294 status = htonl(NFS4ERR_BADXDR);
295 goto err;
296 }
297
298 tmp = ntohl(*p++); /* bitmap size */
299 if (tmp != 1) {
300 status = htonl(NFS4ERR_INVAL);
301 goto err;
302 }
303 dev->cbd_notify_type = ntohl(*p++);
304 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
305 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
306 status = htonl(NFS4ERR_INVAL);
307 goto err;
308 }
309
310 tmp = ntohl(*p++); /* opaque size */
311 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
312 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
313 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
314 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
315 status = htonl(NFS4ERR_INVAL);
316 goto err;
317 }
318 dev->cbd_layout_type = ntohl(*p++);
319 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
320 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
321
322 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
323 p = xdr_inline_decode(xdr, sizeof(uint32_t));
324 if (unlikely(p == NULL)) {
325 status = htonl(NFS4ERR_BADXDR);
326 goto err;
327 }
328 dev->cbd_immediate = ntohl(*p++);
329 } else {
330 dev->cbd_immediate = 0;
331 }
332
333 args->ndevs++;
334
335 dprintk("%s: type %d layout 0x%x immediate %d\n",
336 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
337 dev->cbd_immediate);
338 }
339out:
340 dprintk("%s: status %d ndevs %d\n",
341 __func__, ntohl(status), args->ndevs);
342 return status;
343err:
344 kfree(args->devs);
345 goto out;
346}
347
348static __be32 decode_sessionid(struct xdr_stream *xdr,
349 struct nfs4_sessionid *sid)
350{
351 __be32 *p;
352
353 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
354 if (unlikely(p == NULL))
355 return htonl(NFS4ERR_RESOURCE);
356
357 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
358 return 0;
359}
360
361static __be32 decode_rc_list(struct xdr_stream *xdr,
362 struct referring_call_list *rc_list)
363{
364 __be32 *p;
365 int i;
366 __be32 status;
367
368 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
369 if (status)
370 goto out;
371
372 status = htonl(NFS4ERR_RESOURCE);
373 p = xdr_inline_decode(xdr, sizeof(uint32_t));
374 if (unlikely(p == NULL))
375 goto out;
376
377 rc_list->rcl_nrefcalls = ntohl(*p++);
378 if (rc_list->rcl_nrefcalls) {
379 p = xdr_inline_decode(xdr,
380 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
381 if (unlikely(p == NULL))
382 goto out;
383 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
384 sizeof(*rc_list->rcl_refcalls),
385 GFP_KERNEL);
386 if (unlikely(rc_list->rcl_refcalls == NULL))
387 goto out;
388 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
389 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
390 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
391 }
392 }
393 status = 0;
394
395out:
396 return status;
397}
398
399static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
400 struct xdr_stream *xdr,
401 void *argp)
402{
403 struct cb_sequenceargs *args = argp;
404 __be32 *p;
405 int i;
406 __be32 status;
407
408 status = decode_sessionid(xdr, &args->csa_sessionid);
409 if (status)
410 return status;
411
412 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
413 if (unlikely(p == NULL))
414 return htonl(NFS4ERR_RESOURCE);
415
416 args->csa_addr = svc_addr(rqstp);
417 args->csa_sequenceid = ntohl(*p++);
418 args->csa_slotid = ntohl(*p++);
419 args->csa_highestslotid = ntohl(*p++);
420 args->csa_cachethis = ntohl(*p++);
421 args->csa_nrclists = ntohl(*p++);
422 args->csa_rclists = NULL;
423 if (args->csa_nrclists) {
424 args->csa_rclists = kmalloc_array(args->csa_nrclists,
425 sizeof(*args->csa_rclists),
426 GFP_KERNEL);
427 if (unlikely(args->csa_rclists == NULL))
428 return htonl(NFS4ERR_RESOURCE);
429
430 for (i = 0; i < args->csa_nrclists; i++) {
431 status = decode_rc_list(xdr, &args->csa_rclists[i]);
432 if (status) {
433 args->csa_nrclists = i;
434 goto out_free;
435 }
436 }
437 }
438 return 0;
439
440out_free:
441 for (i = 0; i < args->csa_nrclists; i++)
442 kfree(args->csa_rclists[i].rcl_refcalls);
443 kfree(args->csa_rclists);
444 return status;
445}
446
447static __be32 decode_recallany_args(struct svc_rqst *rqstp,
448 struct xdr_stream *xdr,
449 void *argp)
450{
451 struct cb_recallanyargs *args = argp;
452 uint32_t bitmap[2];
453 __be32 *p, status;
454
455 p = xdr_inline_decode(xdr, 4);
456 if (unlikely(p == NULL))
457 return htonl(NFS4ERR_BADXDR);
458 args->craa_objs_to_keep = ntohl(*p++);
459 status = decode_bitmap(xdr, bitmap);
460 if (unlikely(status))
461 return status;
462 args->craa_type_mask = bitmap[0];
463
464 return 0;
465}
466
467static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
468 struct xdr_stream *xdr,
469 void *argp)
470{
471 struct cb_recallslotargs *args = argp;
472 __be32 *p;
473
474 p = xdr_inline_decode(xdr, 4);
475 if (unlikely(p == NULL))
476 return htonl(NFS4ERR_BADXDR);
477 args->crsa_target_highest_slotid = ntohl(*p++);
478 return 0;
479}
480
481static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
482{
483 __be32 *p;
484 unsigned int len;
485
486 p = xdr_inline_decode(xdr, 12);
487 if (unlikely(p == NULL))
488 return htonl(NFS4ERR_BADXDR);
489
490 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
491 len = be32_to_cpu(*p);
492
493 p = xdr_inline_decode(xdr, len);
494 if (unlikely(p == NULL))
495 return htonl(NFS4ERR_BADXDR);
496
497 /* Only try to decode if the length is right */
498 if (len == 20) {
499 p += 2; /* skip "lock id:" */
500 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
501 xdr_decode_hyper(p, &args->cbnl_owner.id);
502 args->cbnl_valid = true;
503 } else {
504 args->cbnl_owner.s_dev = 0;
505 args->cbnl_owner.id = 0;
506 args->cbnl_valid = false;
507 }
508 return 0;
509}
510
511static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
512 struct xdr_stream *xdr, void *argp)
513{
514 struct cb_notify_lock_args *args = argp;
515 __be32 status;
516
517 status = decode_fh(xdr, &args->cbnl_fh);
518 if (unlikely(status != 0))
519 return status;
520 return decode_lockowner(xdr, args);
521}
522
523#endif /* CONFIG_NFS_V4_1 */
524#ifdef CONFIG_NFS_V4_2
525static __be32 decode_write_response(struct xdr_stream *xdr,
526 struct cb_offloadargs *args)
527{
528 __be32 *p;
529
530 /* skip the always zero field */
531 p = xdr_inline_decode(xdr, 4);
532 if (unlikely(!p))
533 goto out;
534 p++;
535
536 /* decode count, stable_how, verifier */
537 p = xdr_inline_decode(xdr, 8 + 4);
538 if (unlikely(!p))
539 goto out;
540 p = xdr_decode_hyper(p, &args->wr_count);
541 args->wr_writeverf.committed = be32_to_cpup(p);
542 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
543 if (likely(p)) {
544 memcpy(&args->wr_writeverf.verifier.data[0], p,
545 NFS4_VERIFIER_SIZE);
546 return 0;
547 }
548out:
549 return htonl(NFS4ERR_RESOURCE);
550}
551
552static __be32 decode_offload_args(struct svc_rqst *rqstp,
553 struct xdr_stream *xdr,
554 void *data)
555{
556 struct cb_offloadargs *args = data;
557 __be32 *p;
558 __be32 status;
559
560 /* decode fh */
561 status = decode_fh(xdr, &args->coa_fh);
562 if (unlikely(status != 0))
563 return status;
564
565 /* decode stateid */
566 status = decode_stateid(xdr, &args->coa_stateid);
567 if (unlikely(status != 0))
568 return status;
569
570 /* decode status */
571 p = xdr_inline_decode(xdr, 4);
572 if (unlikely(!p))
573 goto out;
574 args->error = ntohl(*p++);
575 if (!args->error) {
576 status = decode_write_response(xdr, args);
577 if (unlikely(status != 0))
578 return status;
579 } else {
580 p = xdr_inline_decode(xdr, 8);
581 if (unlikely(!p))
582 goto out;
583 p = xdr_decode_hyper(p, &args->wr_count);
584 }
585 return 0;
586out:
587 return htonl(NFS4ERR_RESOURCE);
588}
589#endif /* CONFIG_NFS_V4_2 */
590static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
591{
592 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
593 return cpu_to_be32(NFS4ERR_RESOURCE);
594 return 0;
595}
596
597static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
598{
599 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
600 return cpu_to_be32(NFS4ERR_RESOURCE);
601 return 0;
602}
603
604static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
605{
606 __be32 *p;
607
608 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
609 return 0;
610 p = xdr_reserve_space(xdr, 8);
611 if (unlikely(!p))
612 return htonl(NFS4ERR_RESOURCE);
613 p = xdr_encode_hyper(p, change);
614 return 0;
615}
616
617static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
618{
619 __be32 *p;
620
621 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
622 return 0;
623 p = xdr_reserve_space(xdr, 8);
624 if (unlikely(!p))
625 return htonl(NFS4ERR_RESOURCE);
626 p = xdr_encode_hyper(p, size);
627 return 0;
628}
629
630static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
631{
632 __be32 *p;
633
634 p = xdr_reserve_space(xdr, 12);
635 if (unlikely(!p))
636 return htonl(NFS4ERR_RESOURCE);
637 p = xdr_encode_hyper(p, time->tv_sec);
638 *p = htonl(time->tv_nsec);
639 return 0;
640}
641
642static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
643{
644 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
645 return 0;
646 return encode_attr_time(xdr,time);
647}
648
649static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
650{
651 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
652 return 0;
653 return encode_attr_time(xdr,time);
654}
655
656static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
657{
658 __be32 status;
659
660 hdr->status = xdr_reserve_space(xdr, 4);
661 if (unlikely(hdr->status == NULL))
662 return htonl(NFS4ERR_RESOURCE);
663 status = encode_string(xdr, hdr->taglen, hdr->tag);
664 if (unlikely(status != 0))
665 return status;
666 hdr->nops = xdr_reserve_space(xdr, 4);
667 if (unlikely(hdr->nops == NULL))
668 return htonl(NFS4ERR_RESOURCE);
669 return 0;
670}
671
672static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
673{
674 __be32 *p;
675
676 p = xdr_reserve_space(xdr, 8);
677 if (unlikely(p == NULL))
678 return htonl(NFS4ERR_RESOURCE_HDR);
679 *p++ = htonl(op);
680 *p = res;
681 return 0;
682}
683
684static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
685 const void *resp)
686{
687 const struct cb_getattrres *res = resp;
688 __be32 *savep = NULL;
689 __be32 status = res->status;
690
691 if (unlikely(status != 0))
692 goto out;
693 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
694 if (unlikely(status != 0))
695 goto out;
696 status = cpu_to_be32(NFS4ERR_RESOURCE);
697 savep = xdr_reserve_space(xdr, sizeof(*savep));
698 if (unlikely(!savep))
699 goto out;
700 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
701 if (unlikely(status != 0))
702 goto out;
703 status = encode_attr_size(xdr, res->bitmap, res->size);
704 if (unlikely(status != 0))
705 goto out;
706 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
707 if (unlikely(status != 0))
708 goto out;
709 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
710 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
711out:
712 return status;
713}
714
715#if defined(CONFIG_NFS_V4_1)
716
717static __be32 encode_sessionid(struct xdr_stream *xdr,
718 const struct nfs4_sessionid *sid)
719{
720 __be32 *p;
721
722 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
723 if (unlikely(p == NULL))
724 return htonl(NFS4ERR_RESOURCE);
725
726 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
727 return 0;
728}
729
730static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
731 struct xdr_stream *xdr,
732 const void *resp)
733{
734 const struct cb_sequenceres *res = resp;
735 __be32 *p;
736 __be32 status = res->csr_status;
737
738 if (unlikely(status != 0))
739 return status;
740
741 status = encode_sessionid(xdr, &res->csr_sessionid);
742 if (status)
743 return status;
744
745 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
746 if (unlikely(p == NULL))
747 return htonl(NFS4ERR_RESOURCE);
748
749 *p++ = htonl(res->csr_sequenceid);
750 *p++ = htonl(res->csr_slotid);
751 *p++ = htonl(res->csr_highestslotid);
752 *p++ = htonl(res->csr_target_highestslotid);
753 return 0;
754}
755
756static __be32
757preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
758{
759 if (op_nr == OP_CB_SEQUENCE) {
760 if (nop != 0)
761 return htonl(NFS4ERR_SEQUENCE_POS);
762 } else {
763 if (nop == 0)
764 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
765 }
766
767 switch (op_nr) {
768 case OP_CB_GETATTR:
769 case OP_CB_RECALL:
770 case OP_CB_SEQUENCE:
771 case OP_CB_RECALL_ANY:
772 case OP_CB_RECALL_SLOT:
773 case OP_CB_LAYOUTRECALL:
774 case OP_CB_NOTIFY_DEVICEID:
775 case OP_CB_NOTIFY_LOCK:
776 *op = &callback_ops[op_nr];
777 break;
778
779 case OP_CB_NOTIFY:
780 case OP_CB_PUSH_DELEG:
781 case OP_CB_RECALLABLE_OBJ_AVAIL:
782 case OP_CB_WANTS_CANCELLED:
783 return htonl(NFS4ERR_NOTSUPP);
784
785 default:
786 return htonl(NFS4ERR_OP_ILLEGAL);
787 }
788
789 return htonl(NFS_OK);
790}
791
792static void nfs4_callback_free_slot(struct nfs4_session *session,
793 struct nfs4_slot *slot)
794{
795 struct nfs4_slot_table *tbl = &session->bc_slot_table;
796
797 spin_lock(&tbl->slot_tbl_lock);
798 /*
799 * Let the state manager know callback processing done.
800 * A single slot, so highest used slotid is either 0 or -1
801 */
802 nfs4_free_slot(tbl, slot);
803 spin_unlock(&tbl->slot_tbl_lock);
804}
805
806static void nfs4_cb_free_slot(struct cb_process_state *cps)
807{
808 if (cps->slot) {
809 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
810 cps->slot = NULL;
811 }
812}
813
814#else /* CONFIG_NFS_V4_1 */
815
816static __be32
817preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
818{
819 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
820}
821
822static void nfs4_cb_free_slot(struct cb_process_state *cps)
823{
824}
825#endif /* CONFIG_NFS_V4_1 */
826
827#ifdef CONFIG_NFS_V4_2
828static __be32
829preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
830{
831 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
832 if (status != htonl(NFS4ERR_OP_ILLEGAL))
833 return status;
834
835 if (op_nr == OP_CB_OFFLOAD) {
836 *op = &callback_ops[op_nr];
837 return htonl(NFS_OK);
838 } else
839 return htonl(NFS4ERR_NOTSUPP);
840 return htonl(NFS4ERR_OP_ILLEGAL);
841}
842#else /* CONFIG_NFS_V4_2 */
843static __be32
844preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
845{
846 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
847}
848#endif /* CONFIG_NFS_V4_2 */
849
850static __be32
851preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
852{
853 switch (op_nr) {
854 case OP_CB_GETATTR:
855 case OP_CB_RECALL:
856 *op = &callback_ops[op_nr];
857 break;
858 default:
859 return htonl(NFS4ERR_OP_ILLEGAL);
860 }
861
862 return htonl(NFS_OK);
863}
864
865static __be32 process_op(int nop, struct svc_rqst *rqstp,
866 struct xdr_stream *xdr_in, void *argp,
867 struct xdr_stream *xdr_out, void *resp,
868 struct cb_process_state *cps)
869{
870 struct callback_op *op = &callback_ops[0];
871 unsigned int op_nr;
872 __be32 status;
873 long maxlen;
874 __be32 res;
875
876 status = decode_op_hdr(xdr_in, &op_nr);
877 if (unlikely(status))
878 return status;
879
880 switch (cps->minorversion) {
881 case 0:
882 status = preprocess_nfs4_op(op_nr, &op);
883 break;
884 case 1:
885 status = preprocess_nfs41_op(nop, op_nr, &op);
886 break;
887 case 2:
888 status = preprocess_nfs42_op(nop, op_nr, &op);
889 break;
890 default:
891 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
892 }
893
894 if (status == htonl(NFS4ERR_OP_ILLEGAL))
895 op_nr = OP_CB_ILLEGAL;
896 if (status)
897 goto encode_hdr;
898
899 if (cps->drc_status) {
900 status = cps->drc_status;
901 goto encode_hdr;
902 }
903
904 maxlen = xdr_out->end - xdr_out->p;
905 if (maxlen > 0 && maxlen < PAGE_SIZE) {
906 status = op->decode_args(rqstp, xdr_in, argp);
907 if (likely(status == 0))
908 status = op->process_op(argp, resp, cps);
909 } else
910 status = htonl(NFS4ERR_RESOURCE);
911
912encode_hdr:
913 res = encode_op_hdr(xdr_out, op_nr, status);
914 if (unlikely(res))
915 return res;
916 if (op->encode_res != NULL && status == 0)
917 status = op->encode_res(rqstp, xdr_out, resp);
918 return status;
919}
920
921/*
922 * Decode, process and encode a COMPOUND
923 */
924static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
925{
926 struct cb_compound_hdr_arg hdr_arg = { 0 };
927 struct cb_compound_hdr_res hdr_res = { NULL };
928 struct xdr_stream xdr_in, xdr_out;
929 __be32 *p, status;
930 struct cb_process_state cps = {
931 .drc_status = 0,
932 .clp = NULL,
933 .net = SVC_NET(rqstp),
934 };
935 unsigned int nops = 0;
936
937 xdr_init_decode(&xdr_in, &rqstp->rq_arg,
938 rqstp->rq_arg.head[0].iov_base, NULL);
939
940 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
941 xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL);
942
943 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
944 if (status == htonl(NFS4ERR_RESOURCE))
945 return rpc_garbage_args;
946
947 if (hdr_arg.minorversion == 0) {
948 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
949 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) {
950 if (cps.clp)
951 nfs_put_client(cps.clp);
952 goto out_invalidcred;
953 }
954 }
955
956 cps.minorversion = hdr_arg.minorversion;
957 hdr_res.taglen = hdr_arg.taglen;
958 hdr_res.tag = hdr_arg.tag;
959 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
960 if (cps.clp)
961 nfs_put_client(cps.clp);
962 return rpc_system_err;
963 }
964 while (status == 0 && nops != hdr_arg.nops) {
965 status = process_op(nops, rqstp, &xdr_in,
966 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
967 &cps);
968 nops++;
969 }
970
971 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
972 * resource error in cb_compound status without returning op */
973 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
974 status = htonl(NFS4ERR_RESOURCE);
975 nops--;
976 }
977
978 *hdr_res.status = status;
979 *hdr_res.nops = htonl(nops);
980 nfs4_cb_free_slot(&cps);
981 nfs_put_client(cps.clp);
982 return rpc_success;
983
984out_invalidcred:
985 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
986 return svc_return_autherr(rqstp, rpc_autherr_badcred);
987}
988
989/*
990 * Define NFS4 callback COMPOUND ops.
991 */
992static struct callback_op callback_ops[] = {
993 [0] = {
994 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
995 },
996 [OP_CB_GETATTR] = {
997 .process_op = nfs4_callback_getattr,
998 .decode_args = decode_getattr_args,
999 .encode_res = encode_getattr_res,
1000 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1001 },
1002 [OP_CB_RECALL] = {
1003 .process_op = nfs4_callback_recall,
1004 .decode_args = decode_recall_args,
1005 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1006 },
1007#if defined(CONFIG_NFS_V4_1)
1008 [OP_CB_LAYOUTRECALL] = {
1009 .process_op = nfs4_callback_layoutrecall,
1010 .decode_args = decode_layoutrecall_args,
1011 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1012 },
1013 [OP_CB_NOTIFY_DEVICEID] = {
1014 .process_op = nfs4_callback_devicenotify,
1015 .decode_args = decode_devicenotify_args,
1016 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1017 },
1018 [OP_CB_SEQUENCE] = {
1019 .process_op = nfs4_callback_sequence,
1020 .decode_args = decode_cb_sequence_args,
1021 .encode_res = encode_cb_sequence_res,
1022 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1023 },
1024 [OP_CB_RECALL_ANY] = {
1025 .process_op = nfs4_callback_recallany,
1026 .decode_args = decode_recallany_args,
1027 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1028 },
1029 [OP_CB_RECALL_SLOT] = {
1030 .process_op = nfs4_callback_recallslot,
1031 .decode_args = decode_recallslot_args,
1032 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1033 },
1034 [OP_CB_NOTIFY_LOCK] = {
1035 .process_op = nfs4_callback_notify_lock,
1036 .decode_args = decode_notify_lock_args,
1037 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1038 },
1039#endif /* CONFIG_NFS_V4_1 */
1040#ifdef CONFIG_NFS_V4_2
1041 [OP_CB_OFFLOAD] = {
1042 .process_op = nfs4_callback_offload,
1043 .decode_args = decode_offload_args,
1044 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1045 },
1046#endif /* CONFIG_NFS_V4_2 */
1047};
1048
1049/*
1050 * Define NFS4 callback procedures
1051 */
1052static const struct svc_procedure nfs4_callback_procedures1[] = {
1053 [CB_NULL] = {
1054 .pc_func = nfs4_callback_null,
1055 .pc_decode = nfs4_decode_void,
1056 .pc_encode = nfs4_encode_void,
1057 .pc_xdrressize = 1,
1058 },
1059 [CB_COMPOUND] = {
1060 .pc_func = nfs4_callback_compound,
1061 .pc_encode = nfs4_encode_void,
1062 .pc_argsize = 256,
1063 .pc_ressize = 256,
1064 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1065 }
1066};
1067
1068static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1069const struct svc_version nfs4_callback_version1 = {
1070 .vs_vers = 1,
1071 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1072 .vs_proc = nfs4_callback_procedures1,
1073 .vs_count = nfs4_callback_count1,
1074 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1075 .vs_dispatch = NULL,
1076 .vs_hidden = true,
1077 .vs_need_cong_ctrl = true,
1078};
1079
1080static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1081const struct svc_version nfs4_callback_version4 = {
1082 .vs_vers = 4,
1083 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1084 .vs_proc = nfs4_callback_procedures1,
1085 .vs_count = nfs4_callback_count4,
1086 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1087 .vs_dispatch = NULL,
1088 .vs_hidden = true,
1089 .vs_need_cong_ctrl = true,
1090};
1/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
8#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
12#include <linux/ratelimit.h>
13#include <linux/printk.h>
14#include <linux/slab.h>
15#include <linux/sunrpc/bc_xprt.h>
16#include "nfs4_fs.h"
17#include "callback.h"
18#include "internal.h"
19#include "nfs4session.h"
20
21#define CB_OP_TAGLEN_MAXSZ (512)
22#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
23#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
24#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 /* change, size, ctime, mtime */\
27 (2 + 2 + 3 + 3) * 4)
28#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
29
30#if defined(CONFIG_NFS_V4_1)
31#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
34 NFS4_MAX_SESSIONID_LEN + \
35 (1 + 3) * 4) // seqid, 3 slotids
36#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
37#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39#endif /* CONFIG_NFS_V4_1 */
40
41#define NFSDBG_FACILITY NFSDBG_CALLBACK
42
43/* Internal error code */
44#define NFS4ERR_RESOURCE_HDR 11050
45
46typedef __be32 (*callback_process_op_t)(void *, void *,
47 struct cb_process_state *);
48typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
49typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
50
51
52struct callback_op {
53 callback_process_op_t process_op;
54 callback_decode_arg_t decode_args;
55 callback_encode_res_t encode_res;
56 long res_maxsize;
57};
58
59static struct callback_op callback_ops[];
60
61static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
62{
63 return htonl(NFS4_OK);
64}
65
66static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
67{
68 return xdr_argsize_check(rqstp, p);
69}
70
71static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
72{
73 return xdr_ressize_check(rqstp, p);
74}
75
76static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
77{
78 __be32 *p;
79
80 p = xdr_inline_decode(xdr, nbytes);
81 if (unlikely(p == NULL))
82 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
83 return p;
84}
85
86static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
87{
88 __be32 *p;
89
90 p = read_buf(xdr, 4);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *len = ntohl(*p);
94
95 if (*len != 0) {
96 p = read_buf(xdr, *len);
97 if (unlikely(p == NULL))
98 return htonl(NFS4ERR_RESOURCE);
99 *str = (const char *)p;
100 } else
101 *str = NULL;
102
103 return 0;
104}
105
106static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
107{
108 __be32 *p;
109
110 p = read_buf(xdr, 4);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 fh->size = ntohl(*p);
114 if (fh->size > NFS4_FHSIZE)
115 return htonl(NFS4ERR_BADHANDLE);
116 p = read_buf(xdr, fh->size);
117 if (unlikely(p == NULL))
118 return htonl(NFS4ERR_RESOURCE);
119 memcpy(&fh->data[0], p, fh->size);
120 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
121 return 0;
122}
123
124static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
125{
126 __be32 *p;
127 unsigned int attrlen;
128
129 p = read_buf(xdr, 4);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 attrlen = ntohl(*p);
133 p = read_buf(xdr, attrlen << 2);
134 if (unlikely(p == NULL))
135 return htonl(NFS4ERR_RESOURCE);
136 if (likely(attrlen > 0))
137 bitmap[0] = ntohl(*p++);
138 if (attrlen > 1)
139 bitmap[1] = ntohl(*p);
140 return 0;
141}
142
143static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
144{
145 __be32 *p;
146
147 p = read_buf(xdr, NFS4_STATEID_SIZE);
148 if (unlikely(p == NULL))
149 return htonl(NFS4ERR_RESOURCE);
150 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
151 return 0;
152}
153
154static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
155{
156 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
157 return decode_stateid(xdr, stateid);
158}
159
160static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
161{
162 __be32 *p;
163 __be32 status;
164
165 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
166 if (unlikely(status != 0))
167 return status;
168 /* We do not like overly long tags! */
169 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
170 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
171 __func__, hdr->taglen);
172 return htonl(NFS4ERR_RESOURCE);
173 }
174 p = read_buf(xdr, 12);
175 if (unlikely(p == NULL))
176 return htonl(NFS4ERR_RESOURCE);
177 hdr->minorversion = ntohl(*p++);
178 /* Check for minor version support */
179 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
180 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
181 } else {
182 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
183 "illegal minor version %u!\n",
184 __func__, hdr->minorversion);
185 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
186 }
187 hdr->nops = ntohl(*p);
188 dprintk("%s: minorversion %d nops %d\n", __func__,
189 hdr->minorversion, hdr->nops);
190 return 0;
191}
192
193static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
194{
195 __be32 *p;
196 p = read_buf(xdr, 4);
197 if (unlikely(p == NULL))
198 return htonl(NFS4ERR_RESOURCE_HDR);
199 *op = ntohl(*p);
200 return 0;
201}
202
203static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
204{
205 __be32 status;
206
207 status = decode_fh(xdr, &args->fh);
208 if (unlikely(status != 0))
209 goto out;
210 status = decode_bitmap(xdr, args->bitmap);
211out:
212 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
213 return status;
214}
215
216static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
217{
218 __be32 *p;
219 __be32 status;
220
221 status = decode_delegation_stateid(xdr, &args->stateid);
222 if (unlikely(status != 0))
223 goto out;
224 p = read_buf(xdr, 4);
225 if (unlikely(p == NULL)) {
226 status = htonl(NFS4ERR_RESOURCE);
227 goto out;
228 }
229 args->truncate = ntohl(*p);
230 status = decode_fh(xdr, &args->fh);
231out:
232 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
233 return status;
234}
235
236#if defined(CONFIG_NFS_V4_1)
237static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
238{
239 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
240 return decode_stateid(xdr, stateid);
241}
242
243static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
244 struct xdr_stream *xdr,
245 struct cb_layoutrecallargs *args)
246{
247 __be32 *p;
248 __be32 status = 0;
249 uint32_t iomode;
250
251 p = read_buf(xdr, 4 * sizeof(uint32_t));
252 if (unlikely(p == NULL)) {
253 status = htonl(NFS4ERR_BADXDR);
254 goto out;
255 }
256
257 args->cbl_layout_type = ntohl(*p++);
258 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
259 * as it is unusable and ignored with the other types.
260 */
261 iomode = ntohl(*p++);
262 args->cbl_layoutchanged = ntohl(*p++);
263 args->cbl_recall_type = ntohl(*p++);
264
265 if (args->cbl_recall_type == RETURN_FILE) {
266 args->cbl_range.iomode = iomode;
267 status = decode_fh(xdr, &args->cbl_fh);
268 if (unlikely(status != 0))
269 goto out;
270
271 p = read_buf(xdr, 2 * sizeof(uint64_t));
272 if (unlikely(p == NULL)) {
273 status = htonl(NFS4ERR_BADXDR);
274 goto out;
275 }
276 p = xdr_decode_hyper(p, &args->cbl_range.offset);
277 p = xdr_decode_hyper(p, &args->cbl_range.length);
278 status = decode_layout_stateid(xdr, &args->cbl_stateid);
279 if (unlikely(status != 0))
280 goto out;
281 } else if (args->cbl_recall_type == RETURN_FSID) {
282 p = read_buf(xdr, 2 * sizeof(uint64_t));
283 if (unlikely(p == NULL)) {
284 status = htonl(NFS4ERR_BADXDR);
285 goto out;
286 }
287 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
288 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
289 } else if (args->cbl_recall_type != RETURN_ALL) {
290 status = htonl(NFS4ERR_BADXDR);
291 goto out;
292 }
293 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
294 __func__,
295 args->cbl_layout_type, iomode,
296 args->cbl_layoutchanged, args->cbl_recall_type);
297out:
298 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
299 return status;
300}
301
302static
303__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
304 struct xdr_stream *xdr,
305 struct cb_devicenotifyargs *args)
306{
307 __be32 *p;
308 __be32 status = 0;
309 u32 tmp;
310 int n, i;
311 args->ndevs = 0;
312
313 /* Num of device notifications */
314 p = read_buf(xdr, sizeof(uint32_t));
315 if (unlikely(p == NULL)) {
316 status = htonl(NFS4ERR_BADXDR);
317 goto out;
318 }
319 n = ntohl(*p++);
320 if (n <= 0)
321 goto out;
322 if (n > ULONG_MAX / sizeof(*args->devs)) {
323 status = htonl(NFS4ERR_BADXDR);
324 goto out;
325 }
326
327 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
328 if (!args->devs) {
329 status = htonl(NFS4ERR_DELAY);
330 goto out;
331 }
332
333 /* Decode each dev notification */
334 for (i = 0; i < n; i++) {
335 struct cb_devicenotifyitem *dev = &args->devs[i];
336
337 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
338 if (unlikely(p == NULL)) {
339 status = htonl(NFS4ERR_BADXDR);
340 goto err;
341 }
342
343 tmp = ntohl(*p++); /* bitmap size */
344 if (tmp != 1) {
345 status = htonl(NFS4ERR_INVAL);
346 goto err;
347 }
348 dev->cbd_notify_type = ntohl(*p++);
349 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
350 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
351 status = htonl(NFS4ERR_INVAL);
352 goto err;
353 }
354
355 tmp = ntohl(*p++); /* opaque size */
356 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
357 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
358 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
359 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
360 status = htonl(NFS4ERR_INVAL);
361 goto err;
362 }
363 dev->cbd_layout_type = ntohl(*p++);
364 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
365 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
366
367 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
368 p = read_buf(xdr, sizeof(uint32_t));
369 if (unlikely(p == NULL)) {
370 status = htonl(NFS4ERR_BADXDR);
371 goto err;
372 }
373 dev->cbd_immediate = ntohl(*p++);
374 } else {
375 dev->cbd_immediate = 0;
376 }
377
378 args->ndevs++;
379
380 dprintk("%s: type %d layout 0x%x immediate %d\n",
381 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
382 dev->cbd_immediate);
383 }
384out:
385 dprintk("%s: status %d ndevs %d\n",
386 __func__, ntohl(status), args->ndevs);
387 return status;
388err:
389 kfree(args->devs);
390 goto out;
391}
392
393static __be32 decode_sessionid(struct xdr_stream *xdr,
394 struct nfs4_sessionid *sid)
395{
396 __be32 *p;
397
398 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
399 if (unlikely(p == NULL))
400 return htonl(NFS4ERR_RESOURCE);
401
402 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
403 return 0;
404}
405
406static __be32 decode_rc_list(struct xdr_stream *xdr,
407 struct referring_call_list *rc_list)
408{
409 __be32 *p;
410 int i;
411 __be32 status;
412
413 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
414 if (status)
415 goto out;
416
417 status = htonl(NFS4ERR_RESOURCE);
418 p = read_buf(xdr, sizeof(uint32_t));
419 if (unlikely(p == NULL))
420 goto out;
421
422 rc_list->rcl_nrefcalls = ntohl(*p++);
423 if (rc_list->rcl_nrefcalls) {
424 p = read_buf(xdr,
425 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
426 if (unlikely(p == NULL))
427 goto out;
428 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
429 sizeof(*rc_list->rcl_refcalls),
430 GFP_KERNEL);
431 if (unlikely(rc_list->rcl_refcalls == NULL))
432 goto out;
433 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
434 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
435 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
436 }
437 }
438 status = 0;
439
440out:
441 return status;
442}
443
444static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
445 struct xdr_stream *xdr,
446 struct cb_sequenceargs *args)
447{
448 __be32 *p;
449 int i;
450 __be32 status;
451
452 status = decode_sessionid(xdr, &args->csa_sessionid);
453 if (status)
454 goto out;
455
456 status = htonl(NFS4ERR_RESOURCE);
457 p = read_buf(xdr, 5 * sizeof(uint32_t));
458 if (unlikely(p == NULL))
459 goto out;
460
461 args->csa_addr = svc_addr(rqstp);
462 args->csa_sequenceid = ntohl(*p++);
463 args->csa_slotid = ntohl(*p++);
464 args->csa_highestslotid = ntohl(*p++);
465 args->csa_cachethis = ntohl(*p++);
466 args->csa_nrclists = ntohl(*p++);
467 args->csa_rclists = NULL;
468 if (args->csa_nrclists) {
469 args->csa_rclists = kmalloc_array(args->csa_nrclists,
470 sizeof(*args->csa_rclists),
471 GFP_KERNEL);
472 if (unlikely(args->csa_rclists == NULL))
473 goto out;
474
475 for (i = 0; i < args->csa_nrclists; i++) {
476 status = decode_rc_list(xdr, &args->csa_rclists[i]);
477 if (status) {
478 args->csa_nrclists = i;
479 goto out_free;
480 }
481 }
482 }
483 status = 0;
484
485 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
486 "highestslotid %u cachethis %d nrclists %u\n",
487 __func__,
488 ((u32 *)&args->csa_sessionid)[0],
489 ((u32 *)&args->csa_sessionid)[1],
490 ((u32 *)&args->csa_sessionid)[2],
491 ((u32 *)&args->csa_sessionid)[3],
492 args->csa_sequenceid, args->csa_slotid,
493 args->csa_highestslotid, args->csa_cachethis,
494 args->csa_nrclists);
495out:
496 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
497 return status;
498
499out_free:
500 for (i = 0; i < args->csa_nrclists; i++)
501 kfree(args->csa_rclists[i].rcl_refcalls);
502 kfree(args->csa_rclists);
503 goto out;
504}
505
506static __be32 decode_recallany_args(struct svc_rqst *rqstp,
507 struct xdr_stream *xdr,
508 struct cb_recallanyargs *args)
509{
510 uint32_t bitmap[2];
511 __be32 *p, status;
512
513 p = read_buf(xdr, 4);
514 if (unlikely(p == NULL))
515 return htonl(NFS4ERR_BADXDR);
516 args->craa_objs_to_keep = ntohl(*p++);
517 status = decode_bitmap(xdr, bitmap);
518 if (unlikely(status))
519 return status;
520 args->craa_type_mask = bitmap[0];
521
522 return 0;
523}
524
525static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
526 struct xdr_stream *xdr,
527 struct cb_recallslotargs *args)
528{
529 __be32 *p;
530
531 p = read_buf(xdr, 4);
532 if (unlikely(p == NULL))
533 return htonl(NFS4ERR_BADXDR);
534 args->crsa_target_highest_slotid = ntohl(*p++);
535 return 0;
536}
537
538static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
539{
540 __be32 *p;
541 unsigned int len;
542
543 p = read_buf(xdr, 12);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_BADXDR);
546
547 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
548 len = be32_to_cpu(*p);
549
550 p = read_buf(xdr, len);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_BADXDR);
553
554 /* Only try to decode if the length is right */
555 if (len == 20) {
556 p += 2; /* skip "lock id:" */
557 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
558 xdr_decode_hyper(p, &args->cbnl_owner.id);
559 args->cbnl_valid = true;
560 } else {
561 args->cbnl_owner.s_dev = 0;
562 args->cbnl_owner.id = 0;
563 args->cbnl_valid = false;
564 }
565 return 0;
566}
567
568static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args)
569{
570 __be32 status;
571
572 status = decode_fh(xdr, &args->cbnl_fh);
573 if (unlikely(status != 0))
574 goto out;
575 status = decode_lockowner(xdr, args);
576out:
577 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
578 return status;
579}
580
581#endif /* CONFIG_NFS_V4_1 */
582
583static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
584{
585 __be32 *p;
586
587 p = xdr_reserve_space(xdr, 4 + len);
588 if (unlikely(p == NULL))
589 return htonl(NFS4ERR_RESOURCE);
590 xdr_encode_opaque(p, str, len);
591 return 0;
592}
593
594#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
595#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
596static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
597{
598 __be32 bm[2];
599 __be32 *p;
600
601 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
602 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
603 if (bm[1] != 0) {
604 p = xdr_reserve_space(xdr, 16);
605 if (unlikely(p == NULL))
606 return htonl(NFS4ERR_RESOURCE);
607 *p++ = htonl(2);
608 *p++ = bm[0];
609 *p++ = bm[1];
610 } else if (bm[0] != 0) {
611 p = xdr_reserve_space(xdr, 12);
612 if (unlikely(p == NULL))
613 return htonl(NFS4ERR_RESOURCE);
614 *p++ = htonl(1);
615 *p++ = bm[0];
616 } else {
617 p = xdr_reserve_space(xdr, 8);
618 if (unlikely(p == NULL))
619 return htonl(NFS4ERR_RESOURCE);
620 *p++ = htonl(0);
621 }
622 *savep = p;
623 return 0;
624}
625
626static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
627{
628 __be32 *p;
629
630 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
631 return 0;
632 p = xdr_reserve_space(xdr, 8);
633 if (unlikely(!p))
634 return htonl(NFS4ERR_RESOURCE);
635 p = xdr_encode_hyper(p, change);
636 return 0;
637}
638
639static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
640{
641 __be32 *p;
642
643 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
644 return 0;
645 p = xdr_reserve_space(xdr, 8);
646 if (unlikely(!p))
647 return htonl(NFS4ERR_RESOURCE);
648 p = xdr_encode_hyper(p, size);
649 return 0;
650}
651
652static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
653{
654 __be32 *p;
655
656 p = xdr_reserve_space(xdr, 12);
657 if (unlikely(!p))
658 return htonl(NFS4ERR_RESOURCE);
659 p = xdr_encode_hyper(p, time->tv_sec);
660 *p = htonl(time->tv_nsec);
661 return 0;
662}
663
664static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
665{
666 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
667 return 0;
668 return encode_attr_time(xdr,time);
669}
670
671static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
672{
673 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
674 return 0;
675 return encode_attr_time(xdr,time);
676}
677
678static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
679{
680 __be32 status;
681
682 hdr->status = xdr_reserve_space(xdr, 4);
683 if (unlikely(hdr->status == NULL))
684 return htonl(NFS4ERR_RESOURCE);
685 status = encode_string(xdr, hdr->taglen, hdr->tag);
686 if (unlikely(status != 0))
687 return status;
688 hdr->nops = xdr_reserve_space(xdr, 4);
689 if (unlikely(hdr->nops == NULL))
690 return htonl(NFS4ERR_RESOURCE);
691 return 0;
692}
693
694static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
695{
696 __be32 *p;
697
698 p = xdr_reserve_space(xdr, 8);
699 if (unlikely(p == NULL))
700 return htonl(NFS4ERR_RESOURCE_HDR);
701 *p++ = htonl(op);
702 *p = res;
703 return 0;
704}
705
706static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
707{
708 __be32 *savep = NULL;
709 __be32 status = res->status;
710
711 if (unlikely(status != 0))
712 goto out;
713 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
714 if (unlikely(status != 0))
715 goto out;
716 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
717 if (unlikely(status != 0))
718 goto out;
719 status = encode_attr_size(xdr, res->bitmap, res->size);
720 if (unlikely(status != 0))
721 goto out;
722 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
723 if (unlikely(status != 0))
724 goto out;
725 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
726 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
727out:
728 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
729 return status;
730}
731
732#if defined(CONFIG_NFS_V4_1)
733
734static __be32 encode_sessionid(struct xdr_stream *xdr,
735 const struct nfs4_sessionid *sid)
736{
737 __be32 *p;
738
739 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
740 if (unlikely(p == NULL))
741 return htonl(NFS4ERR_RESOURCE);
742
743 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
744 return 0;
745}
746
747static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
748 struct xdr_stream *xdr,
749 const struct cb_sequenceres *res)
750{
751 __be32 *p;
752 __be32 status = res->csr_status;
753
754 if (unlikely(status != 0))
755 goto out;
756
757 status = encode_sessionid(xdr, &res->csr_sessionid);
758 if (status)
759 goto out;
760
761 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
762 if (unlikely(p == NULL))
763 return htonl(NFS4ERR_RESOURCE);
764
765 *p++ = htonl(res->csr_sequenceid);
766 *p++ = htonl(res->csr_slotid);
767 *p++ = htonl(res->csr_highestslotid);
768 *p++ = htonl(res->csr_target_highestslotid);
769out:
770 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
771 return status;
772}
773
774static __be32
775preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
776{
777 if (op_nr == OP_CB_SEQUENCE) {
778 if (nop != 0)
779 return htonl(NFS4ERR_SEQUENCE_POS);
780 } else {
781 if (nop == 0)
782 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
783 }
784
785 switch (op_nr) {
786 case OP_CB_GETATTR:
787 case OP_CB_RECALL:
788 case OP_CB_SEQUENCE:
789 case OP_CB_RECALL_ANY:
790 case OP_CB_RECALL_SLOT:
791 case OP_CB_LAYOUTRECALL:
792 case OP_CB_NOTIFY_DEVICEID:
793 case OP_CB_NOTIFY_LOCK:
794 *op = &callback_ops[op_nr];
795 break;
796
797 case OP_CB_NOTIFY:
798 case OP_CB_PUSH_DELEG:
799 case OP_CB_RECALLABLE_OBJ_AVAIL:
800 case OP_CB_WANTS_CANCELLED:
801 return htonl(NFS4ERR_NOTSUPP);
802
803 default:
804 return htonl(NFS4ERR_OP_ILLEGAL);
805 }
806
807 return htonl(NFS_OK);
808}
809
810static void nfs4_callback_free_slot(struct nfs4_session *session,
811 struct nfs4_slot *slot)
812{
813 struct nfs4_slot_table *tbl = &session->bc_slot_table;
814
815 spin_lock(&tbl->slot_tbl_lock);
816 /*
817 * Let the state manager know callback processing done.
818 * A single slot, so highest used slotid is either 0 or -1
819 */
820 nfs4_free_slot(tbl, slot);
821 nfs4_slot_tbl_drain_complete(tbl);
822 spin_unlock(&tbl->slot_tbl_lock);
823}
824
825static void nfs4_cb_free_slot(struct cb_process_state *cps)
826{
827 if (cps->slot) {
828 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
829 cps->slot = NULL;
830 }
831}
832
833#else /* CONFIG_NFS_V4_1 */
834
835static __be32
836preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
837{
838 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
839}
840
841static void nfs4_cb_free_slot(struct cb_process_state *cps)
842{
843}
844#endif /* CONFIG_NFS_V4_1 */
845
846#ifdef CONFIG_NFS_V4_2
847static __be32
848preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
849{
850 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
851 if (status != htonl(NFS4ERR_OP_ILLEGAL))
852 return status;
853
854 if (op_nr == OP_CB_OFFLOAD)
855 return htonl(NFS4ERR_NOTSUPP);
856 return htonl(NFS4ERR_OP_ILLEGAL);
857}
858#else /* CONFIG_NFS_V4_2 */
859static __be32
860preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
861{
862 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
863}
864#endif /* CONFIG_NFS_V4_2 */
865
866static __be32
867preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
868{
869 switch (op_nr) {
870 case OP_CB_GETATTR:
871 case OP_CB_RECALL:
872 *op = &callback_ops[op_nr];
873 break;
874 default:
875 return htonl(NFS4ERR_OP_ILLEGAL);
876 }
877
878 return htonl(NFS_OK);
879}
880
881static __be32 process_op(int nop, struct svc_rqst *rqstp,
882 struct xdr_stream *xdr_in, void *argp,
883 struct xdr_stream *xdr_out, void *resp,
884 struct cb_process_state *cps)
885{
886 struct callback_op *op = &callback_ops[0];
887 unsigned int op_nr;
888 __be32 status;
889 long maxlen;
890 __be32 res;
891
892 dprintk("%s: start\n", __func__);
893 status = decode_op_hdr(xdr_in, &op_nr);
894 if (unlikely(status))
895 return status;
896
897 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
898 __func__, cps->minorversion, nop, op_nr);
899
900 switch (cps->minorversion) {
901 case 0:
902 status = preprocess_nfs4_op(op_nr, &op);
903 break;
904 case 1:
905 status = preprocess_nfs41_op(nop, op_nr, &op);
906 break;
907 case 2:
908 status = preprocess_nfs42_op(nop, op_nr, &op);
909 break;
910 default:
911 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
912 }
913
914 if (status == htonl(NFS4ERR_OP_ILLEGAL))
915 op_nr = OP_CB_ILLEGAL;
916 if (status)
917 goto encode_hdr;
918
919 if (cps->drc_status) {
920 status = cps->drc_status;
921 goto encode_hdr;
922 }
923
924 maxlen = xdr_out->end - xdr_out->p;
925 if (maxlen > 0 && maxlen < PAGE_SIZE) {
926 status = op->decode_args(rqstp, xdr_in, argp);
927 if (likely(status == 0))
928 status = op->process_op(argp, resp, cps);
929 } else
930 status = htonl(NFS4ERR_RESOURCE);
931
932encode_hdr:
933 res = encode_op_hdr(xdr_out, op_nr, status);
934 if (unlikely(res))
935 return res;
936 if (op->encode_res != NULL && status == 0)
937 status = op->encode_res(rqstp, xdr_out, resp);
938 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
939 return status;
940}
941
942/*
943 * Decode, process and encode a COMPOUND
944 */
945static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
946{
947 struct cb_compound_hdr_arg hdr_arg = { 0 };
948 struct cb_compound_hdr_res hdr_res = { NULL };
949 struct xdr_stream xdr_in, xdr_out;
950 __be32 *p, status;
951 struct cb_process_state cps = {
952 .drc_status = 0,
953 .clp = NULL,
954 .net = SVC_NET(rqstp),
955 };
956 unsigned int nops = 0;
957
958 dprintk("%s: start\n", __func__);
959
960 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
961
962 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
963 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
964
965 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
966 if (status == htonl(NFS4ERR_RESOURCE))
967 return rpc_garbage_args;
968
969 if (hdr_arg.minorversion == 0) {
970 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
971 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
972 goto out_invalidcred;
973 }
974
975 cps.minorversion = hdr_arg.minorversion;
976 hdr_res.taglen = hdr_arg.taglen;
977 hdr_res.tag = hdr_arg.tag;
978 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
979 return rpc_system_err;
980
981 while (status == 0 && nops != hdr_arg.nops) {
982 status = process_op(nops, rqstp, &xdr_in,
983 argp, &xdr_out, resp, &cps);
984 nops++;
985 }
986
987 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
988 * resource error in cb_compound status without returning op */
989 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
990 status = htonl(NFS4ERR_RESOURCE);
991 nops--;
992 }
993
994 *hdr_res.status = status;
995 *hdr_res.nops = htonl(nops);
996 nfs4_cb_free_slot(&cps);
997 nfs_put_client(cps.clp);
998 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
999 return rpc_success;
1000
1001out_invalidcred:
1002 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1003 return rpc_autherr_badcred;
1004}
1005
1006/*
1007 * Define NFS4 callback COMPOUND ops.
1008 */
1009static struct callback_op callback_ops[] = {
1010 [0] = {
1011 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1012 },
1013 [OP_CB_GETATTR] = {
1014 .process_op = (callback_process_op_t)nfs4_callback_getattr,
1015 .decode_args = (callback_decode_arg_t)decode_getattr_args,
1016 .encode_res = (callback_encode_res_t)encode_getattr_res,
1017 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1018 },
1019 [OP_CB_RECALL] = {
1020 .process_op = (callback_process_op_t)nfs4_callback_recall,
1021 .decode_args = (callback_decode_arg_t)decode_recall_args,
1022 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1023 },
1024#if defined(CONFIG_NFS_V4_1)
1025 [OP_CB_LAYOUTRECALL] = {
1026 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
1027 .decode_args =
1028 (callback_decode_arg_t)decode_layoutrecall_args,
1029 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1030 },
1031 [OP_CB_NOTIFY_DEVICEID] = {
1032 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
1033 .decode_args =
1034 (callback_decode_arg_t)decode_devicenotify_args,
1035 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1036 },
1037 [OP_CB_SEQUENCE] = {
1038 .process_op = (callback_process_op_t)nfs4_callback_sequence,
1039 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
1040 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
1041 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1042 },
1043 [OP_CB_RECALL_ANY] = {
1044 .process_op = (callback_process_op_t)nfs4_callback_recallany,
1045 .decode_args = (callback_decode_arg_t)decode_recallany_args,
1046 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1047 },
1048 [OP_CB_RECALL_SLOT] = {
1049 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
1050 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
1051 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1052 },
1053 [OP_CB_NOTIFY_LOCK] = {
1054 .process_op = (callback_process_op_t)nfs4_callback_notify_lock,
1055 .decode_args = (callback_decode_arg_t)decode_notify_lock_args,
1056 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1057 },
1058#endif /* CONFIG_NFS_V4_1 */
1059};
1060
1061/*
1062 * Define NFS4 callback procedures
1063 */
1064static struct svc_procedure nfs4_callback_procedures1[] = {
1065 [CB_NULL] = {
1066 .pc_func = nfs4_callback_null,
1067 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1068 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1069 .pc_xdrressize = 1,
1070 },
1071 [CB_COMPOUND] = {
1072 .pc_func = nfs4_callback_compound,
1073 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1074 .pc_argsize = 256,
1075 .pc_ressize = 256,
1076 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1077 }
1078};
1079
1080struct svc_version nfs4_callback_version1 = {
1081 .vs_vers = 1,
1082 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1083 .vs_proc = nfs4_callback_procedures1,
1084 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1085 .vs_dispatch = NULL,
1086 .vs_hidden = 1,
1087};
1088
1089struct svc_version nfs4_callback_version4 = {
1090 .vs_vers = 4,
1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1092 .vs_proc = nfs4_callback_procedures1,
1093 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1094 .vs_dispatch = NULL,
1095 .vs_hidden = 1,
1096};