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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#include "nfs4trace.h"
22
23#define CB_OP_TAGLEN_MAXSZ (512)
24#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
25#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
26#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
27 CB_OP_GETATTR_BITMAP_MAXSZ + \
28 /* change, size, ctime, mtime */\
29 (2 + 2 + 3 + 3) * 4)
30#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31
32#if defined(CONFIG_NFS_V4_1)
33#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
36 NFS4_MAX_SESSIONID_LEN + \
37 (1 + 3) * 4) // seqid, 3 slotids
38#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
41#endif /* CONFIG_NFS_V4_1 */
42#ifdef CONFIG_NFS_V4_2
43#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
44#endif /* CONFIG_NFS_V4_2 */
45
46#define NFSDBG_FACILITY NFSDBG_CALLBACK
47
48/* Internal error code */
49#define NFS4ERR_RESOURCE_HDR 11050
50
51struct callback_op {
52 __be32 (*process_op)(void *, void *, struct cb_process_state *);
53 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
54 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
55 const void *);
56 long res_maxsize;
57};
58
59static struct callback_op callback_ops[];
60
61static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
62{
63 return htonl(NFS4_OK);
64}
65
66/*
67 * svc_process_common() looks for an XDR encoder to know when
68 * not to drop a Reply.
69 */
70static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
71{
72 return true;
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 uint32_t tmp, n, i;
262 __be32 *p;
263 __be32 status = 0;
264
265 /* Num of device notifications */
266 p = xdr_inline_decode(xdr, sizeof(uint32_t));
267 if (unlikely(p == NULL)) {
268 status = htonl(NFS4ERR_BADXDR);
269 goto out;
270 }
271 n = ntohl(*p++);
272 if (n == 0)
273 goto out;
274
275 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
276 if (!args->devs) {
277 status = htonl(NFS4ERR_DELAY);
278 goto out;
279 }
280
281 /* Decode each dev notification */
282 for (i = 0; i < n; i++) {
283 struct cb_devicenotifyitem *dev = &args->devs[i];
284
285 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
286 NFS4_DEVICEID4_SIZE);
287 if (unlikely(p == NULL)) {
288 status = htonl(NFS4ERR_BADXDR);
289 goto err;
290 }
291
292 tmp = ntohl(*p++); /* bitmap size */
293 if (tmp != 1) {
294 status = htonl(NFS4ERR_INVAL);
295 goto err;
296 }
297 dev->cbd_notify_type = ntohl(*p++);
298 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
299 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
300 status = htonl(NFS4ERR_INVAL);
301 goto err;
302 }
303
304 tmp = ntohl(*p++); /* opaque size */
305 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
306 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
307 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
308 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
309 status = htonl(NFS4ERR_INVAL);
310 goto err;
311 }
312 dev->cbd_layout_type = ntohl(*p++);
313 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
314 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
315
316 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
317 p = xdr_inline_decode(xdr, sizeof(uint32_t));
318 if (unlikely(p == NULL)) {
319 status = htonl(NFS4ERR_BADXDR);
320 goto err;
321 }
322 dev->cbd_immediate = ntohl(*p++);
323 } else {
324 dev->cbd_immediate = 0;
325 }
326
327 dprintk("%s: type %d layout 0x%x immediate %d\n",
328 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
329 dev->cbd_immediate);
330 }
331 args->ndevs = n;
332 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
333 return 0;
334err:
335 kfree(args->devs);
336out:
337 args->devs = NULL;
338 args->ndevs = 0;
339 dprintk("%s: status %d ndevs %d\n",
340 __func__, ntohl(status), args->ndevs);
341 return status;
342}
343
344static __be32 decode_sessionid(struct xdr_stream *xdr,
345 struct nfs4_sessionid *sid)
346{
347 __be32 *p;
348
349 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
350 if (unlikely(p == NULL))
351 return htonl(NFS4ERR_RESOURCE);
352
353 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
354 return 0;
355}
356
357static __be32 decode_rc_list(struct xdr_stream *xdr,
358 struct referring_call_list *rc_list)
359{
360 __be32 *p;
361 int i;
362 __be32 status;
363
364 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
365 if (status)
366 goto out;
367
368 status = htonl(NFS4ERR_RESOURCE);
369 p = xdr_inline_decode(xdr, sizeof(uint32_t));
370 if (unlikely(p == NULL))
371 goto out;
372
373 rc_list->rcl_nrefcalls = ntohl(*p++);
374 if (rc_list->rcl_nrefcalls) {
375 p = xdr_inline_decode(xdr,
376 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
377 if (unlikely(p == NULL))
378 goto out;
379 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
380 sizeof(*rc_list->rcl_refcalls),
381 GFP_KERNEL);
382 if (unlikely(rc_list->rcl_refcalls == NULL))
383 goto out;
384 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
385 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
386 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
387 }
388 }
389 status = 0;
390
391out:
392 return status;
393}
394
395static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
396 struct xdr_stream *xdr,
397 void *argp)
398{
399 struct cb_sequenceargs *args = argp;
400 __be32 *p;
401 int i;
402 __be32 status;
403
404 status = decode_sessionid(xdr, &args->csa_sessionid);
405 if (status)
406 return status;
407
408 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 return htonl(NFS4ERR_RESOURCE);
411
412 args->csa_addr = svc_addr(rqstp);
413 args->csa_sequenceid = ntohl(*p++);
414 args->csa_slotid = ntohl(*p++);
415 args->csa_highestslotid = ntohl(*p++);
416 args->csa_cachethis = ntohl(*p++);
417 args->csa_nrclists = ntohl(*p++);
418 args->csa_rclists = NULL;
419 if (args->csa_nrclists) {
420 args->csa_rclists = kmalloc_array(args->csa_nrclists,
421 sizeof(*args->csa_rclists),
422 GFP_KERNEL);
423 if (unlikely(args->csa_rclists == NULL))
424 return htonl(NFS4ERR_RESOURCE);
425
426 for (i = 0; i < args->csa_nrclists; i++) {
427 status = decode_rc_list(xdr, &args->csa_rclists[i]);
428 if (status) {
429 args->csa_nrclists = i;
430 goto out_free;
431 }
432 }
433 }
434 return 0;
435
436out_free:
437 for (i = 0; i < args->csa_nrclists; i++)
438 kfree(args->csa_rclists[i].rcl_refcalls);
439 kfree(args->csa_rclists);
440 return status;
441}
442
443static __be32 decode_recallany_args(struct svc_rqst *rqstp,
444 struct xdr_stream *xdr,
445 void *argp)
446{
447 struct cb_recallanyargs *args = argp;
448 uint32_t bitmap[2];
449 __be32 *p, status;
450
451 p = xdr_inline_decode(xdr, 4);
452 if (unlikely(p == NULL))
453 return htonl(NFS4ERR_BADXDR);
454 args->craa_objs_to_keep = ntohl(*p++);
455 status = decode_bitmap(xdr, bitmap);
456 if (unlikely(status))
457 return status;
458 args->craa_type_mask = bitmap[0];
459
460 return 0;
461}
462
463static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
464 struct xdr_stream *xdr,
465 void *argp)
466{
467 struct cb_recallslotargs *args = argp;
468 __be32 *p;
469
470 p = xdr_inline_decode(xdr, 4);
471 if (unlikely(p == NULL))
472 return htonl(NFS4ERR_BADXDR);
473 args->crsa_target_highest_slotid = ntohl(*p++);
474 return 0;
475}
476
477static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
478{
479 __be32 *p;
480 unsigned int len;
481
482 p = xdr_inline_decode(xdr, 12);
483 if (unlikely(p == NULL))
484 return htonl(NFS4ERR_BADXDR);
485
486 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
487 len = be32_to_cpu(*p);
488
489 p = xdr_inline_decode(xdr, len);
490 if (unlikely(p == NULL))
491 return htonl(NFS4ERR_BADXDR);
492
493 /* Only try to decode if the length is right */
494 if (len == 20) {
495 p += 2; /* skip "lock id:" */
496 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
497 xdr_decode_hyper(p, &args->cbnl_owner.id);
498 args->cbnl_valid = true;
499 } else {
500 args->cbnl_owner.s_dev = 0;
501 args->cbnl_owner.id = 0;
502 args->cbnl_valid = false;
503 }
504 return 0;
505}
506
507static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
508 struct xdr_stream *xdr, void *argp)
509{
510 struct cb_notify_lock_args *args = argp;
511 __be32 status;
512
513 status = decode_fh(xdr, &args->cbnl_fh);
514 if (unlikely(status != 0))
515 return status;
516 return decode_lockowner(xdr, args);
517}
518
519#endif /* CONFIG_NFS_V4_1 */
520#ifdef CONFIG_NFS_V4_2
521static __be32 decode_write_response(struct xdr_stream *xdr,
522 struct cb_offloadargs *args)
523{
524 __be32 *p;
525
526 /* skip the always zero field */
527 p = xdr_inline_decode(xdr, 4);
528 if (unlikely(!p))
529 goto out;
530 p++;
531
532 /* decode count, stable_how, verifier */
533 p = xdr_inline_decode(xdr, 8 + 4);
534 if (unlikely(!p))
535 goto out;
536 p = xdr_decode_hyper(p, &args->wr_count);
537 args->wr_writeverf.committed = be32_to_cpup(p);
538 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
539 if (likely(p)) {
540 memcpy(&args->wr_writeverf.verifier.data[0], p,
541 NFS4_VERIFIER_SIZE);
542 return 0;
543 }
544out:
545 return htonl(NFS4ERR_RESOURCE);
546}
547
548static __be32 decode_offload_args(struct svc_rqst *rqstp,
549 struct xdr_stream *xdr,
550 void *data)
551{
552 struct cb_offloadargs *args = data;
553 __be32 *p;
554 __be32 status;
555
556 /* decode fh */
557 status = decode_fh(xdr, &args->coa_fh);
558 if (unlikely(status != 0))
559 return status;
560
561 /* decode stateid */
562 status = decode_stateid(xdr, &args->coa_stateid);
563 if (unlikely(status != 0))
564 return status;
565
566 /* decode status */
567 p = xdr_inline_decode(xdr, 4);
568 if (unlikely(!p))
569 goto out;
570 args->error = ntohl(*p++);
571 if (!args->error) {
572 status = decode_write_response(xdr, args);
573 if (unlikely(status != 0))
574 return status;
575 } else {
576 p = xdr_inline_decode(xdr, 8);
577 if (unlikely(!p))
578 goto out;
579 p = xdr_decode_hyper(p, &args->wr_count);
580 }
581 return 0;
582out:
583 return htonl(NFS4ERR_RESOURCE);
584}
585#endif /* CONFIG_NFS_V4_2 */
586static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
587{
588 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
589 return cpu_to_be32(NFS4ERR_RESOURCE);
590 return 0;
591}
592
593static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
594{
595 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
596 return cpu_to_be32(NFS4ERR_RESOURCE);
597 return 0;
598}
599
600static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
601{
602 __be32 *p;
603
604 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
605 return 0;
606 p = xdr_reserve_space(xdr, 8);
607 if (unlikely(!p))
608 return htonl(NFS4ERR_RESOURCE);
609 p = xdr_encode_hyper(p, change);
610 return 0;
611}
612
613static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
614{
615 __be32 *p;
616
617 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
618 return 0;
619 p = xdr_reserve_space(xdr, 8);
620 if (unlikely(!p))
621 return htonl(NFS4ERR_RESOURCE);
622 p = xdr_encode_hyper(p, size);
623 return 0;
624}
625
626static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
627{
628 __be32 *p;
629
630 p = xdr_reserve_space(xdr, 12);
631 if (unlikely(!p))
632 return htonl(NFS4ERR_RESOURCE);
633 p = xdr_encode_hyper(p, time->tv_sec);
634 *p = htonl(time->tv_nsec);
635 return 0;
636}
637
638static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
639{
640 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
641 return 0;
642 return encode_attr_time(xdr,time);
643}
644
645static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
646{
647 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
648 return 0;
649 return encode_attr_time(xdr,time);
650}
651
652static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
653{
654 __be32 status;
655
656 hdr->status = xdr_reserve_space(xdr, 4);
657 if (unlikely(hdr->status == NULL))
658 return htonl(NFS4ERR_RESOURCE);
659 status = encode_string(xdr, hdr->taglen, hdr->tag);
660 if (unlikely(status != 0))
661 return status;
662 hdr->nops = xdr_reserve_space(xdr, 4);
663 if (unlikely(hdr->nops == NULL))
664 return htonl(NFS4ERR_RESOURCE);
665 return 0;
666}
667
668static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
669{
670 __be32 *p;
671
672 p = xdr_reserve_space(xdr, 8);
673 if (unlikely(p == NULL))
674 return htonl(NFS4ERR_RESOURCE_HDR);
675 *p++ = htonl(op);
676 *p = res;
677 return 0;
678}
679
680static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
681 const void *resp)
682{
683 const struct cb_getattrres *res = resp;
684 __be32 *savep = NULL;
685 __be32 status = res->status;
686
687 if (unlikely(status != 0))
688 goto out;
689 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
690 if (unlikely(status != 0))
691 goto out;
692 status = cpu_to_be32(NFS4ERR_RESOURCE);
693 savep = xdr_reserve_space(xdr, sizeof(*savep));
694 if (unlikely(!savep))
695 goto out;
696 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
697 if (unlikely(status != 0))
698 goto out;
699 status = encode_attr_size(xdr, res->bitmap, res->size);
700 if (unlikely(status != 0))
701 goto out;
702 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
703 if (unlikely(status != 0))
704 goto out;
705 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
706 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
707out:
708 return status;
709}
710
711#if defined(CONFIG_NFS_V4_1)
712
713static __be32 encode_sessionid(struct xdr_stream *xdr,
714 const struct nfs4_sessionid *sid)
715{
716 __be32 *p;
717
718 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
719 if (unlikely(p == NULL))
720 return htonl(NFS4ERR_RESOURCE);
721
722 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
723 return 0;
724}
725
726static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
727 struct xdr_stream *xdr,
728 const void *resp)
729{
730 const struct cb_sequenceres *res = resp;
731 __be32 *p;
732 __be32 status = res->csr_status;
733
734 if (unlikely(status != 0))
735 return status;
736
737 status = encode_sessionid(xdr, &res->csr_sessionid);
738 if (status)
739 return status;
740
741 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
742 if (unlikely(p == NULL))
743 return htonl(NFS4ERR_RESOURCE);
744
745 *p++ = htonl(res->csr_sequenceid);
746 *p++ = htonl(res->csr_slotid);
747 *p++ = htonl(res->csr_highestslotid);
748 *p++ = htonl(res->csr_target_highestslotid);
749 return 0;
750}
751
752static __be32
753preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
754{
755 if (op_nr == OP_CB_SEQUENCE) {
756 if (nop != 0)
757 return htonl(NFS4ERR_SEQUENCE_POS);
758 } else {
759 if (nop == 0)
760 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
761 }
762
763 switch (op_nr) {
764 case OP_CB_GETATTR:
765 case OP_CB_RECALL:
766 case OP_CB_SEQUENCE:
767 case OP_CB_RECALL_ANY:
768 case OP_CB_RECALL_SLOT:
769 case OP_CB_LAYOUTRECALL:
770 case OP_CB_NOTIFY_DEVICEID:
771 case OP_CB_NOTIFY_LOCK:
772 *op = &callback_ops[op_nr];
773 break;
774
775 case OP_CB_NOTIFY:
776 case OP_CB_PUSH_DELEG:
777 case OP_CB_RECALLABLE_OBJ_AVAIL:
778 case OP_CB_WANTS_CANCELLED:
779 return htonl(NFS4ERR_NOTSUPP);
780
781 default:
782 return htonl(NFS4ERR_OP_ILLEGAL);
783 }
784
785 return htonl(NFS_OK);
786}
787
788static void nfs4_callback_free_slot(struct nfs4_session *session,
789 struct nfs4_slot *slot)
790{
791 struct nfs4_slot_table *tbl = &session->bc_slot_table;
792
793 spin_lock(&tbl->slot_tbl_lock);
794 /*
795 * Let the state manager know callback processing done.
796 * A single slot, so highest used slotid is either 0 or -1
797 */
798 nfs4_free_slot(tbl, slot);
799 spin_unlock(&tbl->slot_tbl_lock);
800}
801
802static void nfs4_cb_free_slot(struct cb_process_state *cps)
803{
804 if (cps->slot) {
805 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
806 cps->slot = NULL;
807 }
808}
809
810#else /* CONFIG_NFS_V4_1 */
811
812static __be32
813preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
814{
815 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
816}
817
818static void nfs4_cb_free_slot(struct cb_process_state *cps)
819{
820}
821#endif /* CONFIG_NFS_V4_1 */
822
823#ifdef CONFIG_NFS_V4_2
824static __be32
825preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
826{
827 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
828 if (status != htonl(NFS4ERR_OP_ILLEGAL))
829 return status;
830
831 if (op_nr == OP_CB_OFFLOAD) {
832 *op = &callback_ops[op_nr];
833 return htonl(NFS_OK);
834 } else
835 return htonl(NFS4ERR_NOTSUPP);
836 return htonl(NFS4ERR_OP_ILLEGAL);
837}
838#else /* CONFIG_NFS_V4_2 */
839static __be32
840preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
841{
842 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
843}
844#endif /* CONFIG_NFS_V4_2 */
845
846static __be32
847preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
848{
849 switch (op_nr) {
850 case OP_CB_GETATTR:
851 case OP_CB_RECALL:
852 *op = &callback_ops[op_nr];
853 break;
854 default:
855 return htonl(NFS4ERR_OP_ILLEGAL);
856 }
857
858 return htonl(NFS_OK);
859}
860
861static __be32 process_op(int nop, struct svc_rqst *rqstp,
862 struct cb_process_state *cps)
863{
864 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
865 struct callback_op *op = &callback_ops[0];
866 unsigned int op_nr;
867 __be32 status;
868 long maxlen;
869 __be32 res;
870
871 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
872 if (unlikely(status))
873 return status;
874
875 switch (cps->minorversion) {
876 case 0:
877 status = preprocess_nfs4_op(op_nr, &op);
878 break;
879 case 1:
880 status = preprocess_nfs41_op(nop, op_nr, &op);
881 break;
882 case 2:
883 status = preprocess_nfs42_op(nop, op_nr, &op);
884 break;
885 default:
886 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
887 }
888
889 if (status == htonl(NFS4ERR_OP_ILLEGAL))
890 op_nr = OP_CB_ILLEGAL;
891 if (status)
892 goto encode_hdr;
893
894 if (cps->drc_status) {
895 status = cps->drc_status;
896 goto encode_hdr;
897 }
898
899 maxlen = xdr_out->end - xdr_out->p;
900 if (maxlen > 0 && maxlen < PAGE_SIZE) {
901 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
902 rqstp->rq_argp);
903 if (likely(status == 0))
904 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
905 cps);
906 } else
907 status = htonl(NFS4ERR_RESOURCE);
908
909encode_hdr:
910 res = encode_op_hdr(xdr_out, op_nr, status);
911 if (unlikely(res))
912 return res;
913 if (op->encode_res != NULL && status == 0)
914 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
915 return status;
916}
917
918/*
919 * Decode, process and encode a COMPOUND
920 */
921static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
922{
923 struct cb_compound_hdr_arg hdr_arg = { 0 };
924 struct cb_compound_hdr_res hdr_res = { NULL };
925 struct cb_process_state cps = {
926 .drc_status = 0,
927 .clp = NULL,
928 .net = SVC_NET(rqstp),
929 };
930 unsigned int nops = 0;
931 __be32 status;
932
933 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
934 if (status == htonl(NFS4ERR_RESOURCE))
935 return rpc_garbage_args;
936
937 if (hdr_arg.minorversion == 0) {
938 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
939 if (!cps.clp) {
940 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
941 goto out_invalidcred;
942 }
943 if (!check_gss_callback_principal(cps.clp, rqstp)) {
944 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
945 nfs_put_client(cps.clp);
946 goto out_invalidcred;
947 }
948 }
949
950 cps.minorversion = hdr_arg.minorversion;
951 hdr_res.taglen = hdr_arg.taglen;
952 hdr_res.tag = hdr_arg.tag;
953 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
954 if (cps.clp)
955 nfs_put_client(cps.clp);
956 return rpc_system_err;
957 }
958 while (status == 0 && nops != hdr_arg.nops) {
959 status = process_op(nops, rqstp, &cps);
960 nops++;
961 }
962
963 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
964 * resource error in cb_compound status without returning op */
965 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
966 status = htonl(NFS4ERR_RESOURCE);
967 nops--;
968 }
969
970 if (svc_is_backchannel(rqstp) && cps.clp) {
971 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval;
972 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries;
973 }
974
975 *hdr_res.status = status;
976 *hdr_res.nops = htonl(nops);
977 nfs4_cb_free_slot(&cps);
978 nfs_put_client(cps.clp);
979 return rpc_success;
980
981out_invalidcred:
982 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
983 rqstp->rq_auth_stat = rpc_autherr_badcred;
984 return rpc_success;
985}
986
987static int
988nfs_callback_dispatch(struct svc_rqst *rqstp)
989{
990 const struct svc_procedure *procp = rqstp->rq_procinfo;
991
992 *rqstp->rq_accept_statp = procp->pc_func(rqstp);
993 return 1;
994}
995
996/*
997 * Define NFS4 callback COMPOUND ops.
998 */
999static struct callback_op callback_ops[] = {
1000 [0] = {
1001 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1002 },
1003 [OP_CB_GETATTR] = {
1004 .process_op = nfs4_callback_getattr,
1005 .decode_args = decode_getattr_args,
1006 .encode_res = encode_getattr_res,
1007 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1008 },
1009 [OP_CB_RECALL] = {
1010 .process_op = nfs4_callback_recall,
1011 .decode_args = decode_recall_args,
1012 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1013 },
1014#if defined(CONFIG_NFS_V4_1)
1015 [OP_CB_LAYOUTRECALL] = {
1016 .process_op = nfs4_callback_layoutrecall,
1017 .decode_args = decode_layoutrecall_args,
1018 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1019 },
1020 [OP_CB_NOTIFY_DEVICEID] = {
1021 .process_op = nfs4_callback_devicenotify,
1022 .decode_args = decode_devicenotify_args,
1023 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1024 },
1025 [OP_CB_SEQUENCE] = {
1026 .process_op = nfs4_callback_sequence,
1027 .decode_args = decode_cb_sequence_args,
1028 .encode_res = encode_cb_sequence_res,
1029 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1030 },
1031 [OP_CB_RECALL_ANY] = {
1032 .process_op = nfs4_callback_recallany,
1033 .decode_args = decode_recallany_args,
1034 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1035 },
1036 [OP_CB_RECALL_SLOT] = {
1037 .process_op = nfs4_callback_recallslot,
1038 .decode_args = decode_recallslot_args,
1039 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1040 },
1041 [OP_CB_NOTIFY_LOCK] = {
1042 .process_op = nfs4_callback_notify_lock,
1043 .decode_args = decode_notify_lock_args,
1044 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1045 },
1046#endif /* CONFIG_NFS_V4_1 */
1047#ifdef CONFIG_NFS_V4_2
1048 [OP_CB_OFFLOAD] = {
1049 .process_op = nfs4_callback_offload,
1050 .decode_args = decode_offload_args,
1051 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1052 },
1053#endif /* CONFIG_NFS_V4_2 */
1054};
1055
1056/*
1057 * Define NFS4 callback procedures
1058 */
1059static const struct svc_procedure nfs4_callback_procedures1[] = {
1060 [CB_NULL] = {
1061 .pc_func = nfs4_callback_null,
1062 .pc_encode = nfs4_encode_void,
1063 .pc_xdrressize = 1,
1064 .pc_name = "NULL",
1065 },
1066 [CB_COMPOUND] = {
1067 .pc_func = nfs4_callback_compound,
1068 .pc_encode = nfs4_encode_void,
1069 .pc_argsize = 256,
1070 .pc_argzero = 256,
1071 .pc_ressize = 256,
1072 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1073 .pc_name = "COMPOUND",
1074 }
1075};
1076
1077static DEFINE_PER_CPU_ALIGNED(unsigned long,
1078 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]);
1079const struct svc_version nfs4_callback_version1 = {
1080 .vs_vers = 1,
1081 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1082 .vs_proc = nfs4_callback_procedures1,
1083 .vs_count = nfs4_callback_count1,
1084 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1085 .vs_dispatch = nfs_callback_dispatch,
1086 .vs_hidden = true,
1087 .vs_need_cong_ctrl = true,
1088};
1089
1090static DEFINE_PER_CPU_ALIGNED(unsigned long,
1091 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]);
1092const struct svc_version nfs4_callback_version4 = {
1093 .vs_vers = 4,
1094 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1095 .vs_proc = nfs4_callback_procedures1,
1096 .vs_count = nfs4_callback_count4,
1097 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1098 .vs_dispatch = nfs_callback_dispatch,
1099 .vs_hidden = true,
1100 .vs_need_cong_ctrl = true,
1101};
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 + CB_OP_TAGLEN_MAXSZ)
23#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
24#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 2 + 2 + 3 + 3)
27#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28
29#if defined(CONFIG_NFS_V4_1)
30#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
33 4 + 1 + 3)
34#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
36#endif /* CONFIG_NFS_V4_1 */
37
38#define NFSDBG_FACILITY NFSDBG_CALLBACK
39
40/* Internal error code */
41#define NFS4ERR_RESOURCE_HDR 11050
42
43typedef __be32 (*callback_process_op_t)(void *, void *,
44 struct cb_process_state *);
45typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
46typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
47
48
49struct callback_op {
50 callback_process_op_t process_op;
51 callback_decode_arg_t decode_args;
52 callback_encode_res_t encode_res;
53 long res_maxsize;
54};
55
56static struct callback_op callback_ops[];
57
58static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
59{
60 return htonl(NFS4_OK);
61}
62
63static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
64{
65 return xdr_argsize_check(rqstp, p);
66}
67
68static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
69{
70 return xdr_ressize_check(rqstp, p);
71}
72
73static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
74{
75 __be32 *p;
76
77 p = xdr_inline_decode(xdr, nbytes);
78 if (unlikely(p == NULL))
79 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
80 return p;
81}
82
83static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
84{
85 __be32 *p;
86
87 p = read_buf(xdr, 4);
88 if (unlikely(p == NULL))
89 return htonl(NFS4ERR_RESOURCE);
90 *len = ntohl(*p);
91
92 if (*len != 0) {
93 p = read_buf(xdr, *len);
94 if (unlikely(p == NULL))
95 return htonl(NFS4ERR_RESOURCE);
96 *str = (const char *)p;
97 } else
98 *str = NULL;
99
100 return 0;
101}
102
103static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
104{
105 __be32 *p;
106
107 p = read_buf(xdr, 4);
108 if (unlikely(p == NULL))
109 return htonl(NFS4ERR_RESOURCE);
110 fh->size = ntohl(*p);
111 if (fh->size > NFS4_FHSIZE)
112 return htonl(NFS4ERR_BADHANDLE);
113 p = read_buf(xdr, fh->size);
114 if (unlikely(p == NULL))
115 return htonl(NFS4ERR_RESOURCE);
116 memcpy(&fh->data[0], p, fh->size);
117 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
118 return 0;
119}
120
121static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
122{
123 __be32 *p;
124 unsigned int attrlen;
125
126 p = read_buf(xdr, 4);
127 if (unlikely(p == NULL))
128 return htonl(NFS4ERR_RESOURCE);
129 attrlen = ntohl(*p);
130 p = read_buf(xdr, attrlen << 2);
131 if (unlikely(p == NULL))
132 return htonl(NFS4ERR_RESOURCE);
133 if (likely(attrlen > 0))
134 bitmap[0] = ntohl(*p++);
135 if (attrlen > 1)
136 bitmap[1] = ntohl(*p);
137 return 0;
138}
139
140static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
141{
142 __be32 *p;
143
144 p = read_buf(xdr, NFS4_STATEID_SIZE);
145 if (unlikely(p == NULL))
146 return htonl(NFS4ERR_RESOURCE);
147 memcpy(stateid, p, NFS4_STATEID_SIZE);
148 return 0;
149}
150
151static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
152{
153 __be32 *p;
154 __be32 status;
155
156 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
157 if (unlikely(status != 0))
158 return status;
159 /* We do not like overly long tags! */
160 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
161 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
162 __func__, hdr->taglen);
163 return htonl(NFS4ERR_RESOURCE);
164 }
165 p = read_buf(xdr, 12);
166 if (unlikely(p == NULL))
167 return htonl(NFS4ERR_RESOURCE);
168 hdr->minorversion = ntohl(*p++);
169 /* Check for minor version support */
170 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
171 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
172 } else {
173 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
174 "illegal minor version %u!\n",
175 __func__, hdr->minorversion);
176 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
177 }
178 hdr->nops = ntohl(*p);
179 dprintk("%s: minorversion %d nops %d\n", __func__,
180 hdr->minorversion, hdr->nops);
181 return 0;
182}
183
184static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
185{
186 __be32 *p;
187 p = read_buf(xdr, 4);
188 if (unlikely(p == NULL))
189 return htonl(NFS4ERR_RESOURCE_HDR);
190 *op = ntohl(*p);
191 return 0;
192}
193
194static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
195{
196 __be32 status;
197
198 status = decode_fh(xdr, &args->fh);
199 if (unlikely(status != 0))
200 goto out;
201 args->addr = svc_addr(rqstp);
202 status = decode_bitmap(xdr, args->bitmap);
203out:
204 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
205 return status;
206}
207
208static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
209{
210 __be32 *p;
211 __be32 status;
212
213 args->addr = svc_addr(rqstp);
214 status = decode_stateid(xdr, &args->stateid);
215 if (unlikely(status != 0))
216 goto out;
217 p = read_buf(xdr, 4);
218 if (unlikely(p == NULL)) {
219 status = htonl(NFS4ERR_RESOURCE);
220 goto out;
221 }
222 args->truncate = ntohl(*p);
223 status = decode_fh(xdr, &args->fh);
224out:
225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226 return status;
227}
228
229#if defined(CONFIG_NFS_V4_1)
230
231static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
232 struct xdr_stream *xdr,
233 struct cb_layoutrecallargs *args)
234{
235 __be32 *p;
236 __be32 status = 0;
237 uint32_t iomode;
238
239 args->cbl_addr = svc_addr(rqstp);
240 p = read_buf(xdr, 4 * sizeof(uint32_t));
241 if (unlikely(p == NULL)) {
242 status = htonl(NFS4ERR_BADXDR);
243 goto out;
244 }
245
246 args->cbl_layout_type = ntohl(*p++);
247 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
248 * as it is unusable and ignored with the other types.
249 */
250 iomode = ntohl(*p++);
251 args->cbl_layoutchanged = ntohl(*p++);
252 args->cbl_recall_type = ntohl(*p++);
253
254 if (args->cbl_recall_type == RETURN_FILE) {
255 args->cbl_range.iomode = iomode;
256 status = decode_fh(xdr, &args->cbl_fh);
257 if (unlikely(status != 0))
258 goto out;
259
260 p = read_buf(xdr, 2 * sizeof(uint64_t));
261 if (unlikely(p == NULL)) {
262 status = htonl(NFS4ERR_BADXDR);
263 goto out;
264 }
265 p = xdr_decode_hyper(p, &args->cbl_range.offset);
266 p = xdr_decode_hyper(p, &args->cbl_range.length);
267 status = decode_stateid(xdr, &args->cbl_stateid);
268 if (unlikely(status != 0))
269 goto out;
270 } else if (args->cbl_recall_type == RETURN_FSID) {
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_fsid.major);
277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
278 } else if (args->cbl_recall_type != RETURN_ALL) {
279 status = htonl(NFS4ERR_BADXDR);
280 goto out;
281 }
282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
283 __func__,
284 args->cbl_layout_type, iomode,
285 args->cbl_layoutchanged, args->cbl_recall_type);
286out:
287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
288 return status;
289}
290
291static
292__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
293 struct xdr_stream *xdr,
294 struct cb_devicenotifyargs *args)
295{
296 __be32 *p;
297 __be32 status = 0;
298 u32 tmp;
299 int n, i;
300 args->ndevs = 0;
301
302 /* Num of device notifications */
303 p = read_buf(xdr, sizeof(uint32_t));
304 if (unlikely(p == NULL)) {
305 status = htonl(NFS4ERR_BADXDR);
306 goto out;
307 }
308 n = ntohl(*p++);
309 if (n <= 0)
310 goto out;
311 if (n > ULONG_MAX / sizeof(*args->devs)) {
312 status = htonl(NFS4ERR_BADXDR);
313 goto out;
314 }
315
316 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
317 if (!args->devs) {
318 status = htonl(NFS4ERR_DELAY);
319 goto out;
320 }
321
322 /* Decode each dev notification */
323 for (i = 0; i < n; i++) {
324 struct cb_devicenotifyitem *dev = &args->devs[i];
325
326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
327 if (unlikely(p == NULL)) {
328 status = htonl(NFS4ERR_BADXDR);
329 goto err;
330 }
331
332 tmp = ntohl(*p++); /* bitmap size */
333 if (tmp != 1) {
334 status = htonl(NFS4ERR_INVAL);
335 goto err;
336 }
337 dev->cbd_notify_type = ntohl(*p++);
338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
340 status = htonl(NFS4ERR_INVAL);
341 goto err;
342 }
343
344 tmp = ntohl(*p++); /* opaque size */
345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
346 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
348 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
349 status = htonl(NFS4ERR_INVAL);
350 goto err;
351 }
352 dev->cbd_layout_type = ntohl(*p++);
353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
355
356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
357 p = read_buf(xdr, sizeof(uint32_t));
358 if (unlikely(p == NULL)) {
359 status = htonl(NFS4ERR_BADXDR);
360 goto err;
361 }
362 dev->cbd_immediate = ntohl(*p++);
363 } else {
364 dev->cbd_immediate = 0;
365 }
366
367 args->ndevs++;
368
369 dprintk("%s: type %d layout 0x%x immediate %d\n",
370 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
371 dev->cbd_immediate);
372 }
373out:
374 dprintk("%s: status %d ndevs %d\n",
375 __func__, ntohl(status), args->ndevs);
376 return status;
377err:
378 kfree(args->devs);
379 goto out;
380}
381
382static __be32 decode_sessionid(struct xdr_stream *xdr,
383 struct nfs4_sessionid *sid)
384{
385 __be32 *p;
386 int len = NFS4_MAX_SESSIONID_LEN;
387
388 p = read_buf(xdr, len);
389 if (unlikely(p == NULL))
390 return htonl(NFS4ERR_RESOURCE);
391
392 memcpy(sid->data, p, len);
393 return 0;
394}
395
396static __be32 decode_rc_list(struct xdr_stream *xdr,
397 struct referring_call_list *rc_list)
398{
399 __be32 *p;
400 int i;
401 __be32 status;
402
403 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
404 if (status)
405 goto out;
406
407 status = htonl(NFS4ERR_RESOURCE);
408 p = read_buf(xdr, sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 goto out;
411
412 rc_list->rcl_nrefcalls = ntohl(*p++);
413 if (rc_list->rcl_nrefcalls) {
414 p = read_buf(xdr,
415 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
416 if (unlikely(p == NULL))
417 goto out;
418 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
419 sizeof(*rc_list->rcl_refcalls),
420 GFP_KERNEL);
421 if (unlikely(rc_list->rcl_refcalls == NULL))
422 goto out;
423 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
424 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
425 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
426 }
427 }
428 status = 0;
429
430out:
431 return status;
432}
433
434static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
435 struct xdr_stream *xdr,
436 struct cb_sequenceargs *args)
437{
438 __be32 *p;
439 int i;
440 __be32 status;
441
442 status = decode_sessionid(xdr, &args->csa_sessionid);
443 if (status)
444 goto out;
445
446 status = htonl(NFS4ERR_RESOURCE);
447 p = read_buf(xdr, 5 * sizeof(uint32_t));
448 if (unlikely(p == NULL))
449 goto out;
450
451 args->csa_addr = svc_addr(rqstp);
452 args->csa_sequenceid = ntohl(*p++);
453 args->csa_slotid = ntohl(*p++);
454 args->csa_highestslotid = ntohl(*p++);
455 args->csa_cachethis = ntohl(*p++);
456 args->csa_nrclists = ntohl(*p++);
457 args->csa_rclists = NULL;
458 if (args->csa_nrclists) {
459 args->csa_rclists = kmalloc_array(args->csa_nrclists,
460 sizeof(*args->csa_rclists),
461 GFP_KERNEL);
462 if (unlikely(args->csa_rclists == NULL))
463 goto out;
464
465 for (i = 0; i < args->csa_nrclists; i++) {
466 status = decode_rc_list(xdr, &args->csa_rclists[i]);
467 if (status)
468 goto out_free;
469 }
470 }
471 status = 0;
472
473 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
474 "highestslotid %u cachethis %d nrclists %u\n",
475 __func__,
476 ((u32 *)&args->csa_sessionid)[0],
477 ((u32 *)&args->csa_sessionid)[1],
478 ((u32 *)&args->csa_sessionid)[2],
479 ((u32 *)&args->csa_sessionid)[3],
480 args->csa_sequenceid, args->csa_slotid,
481 args->csa_highestslotid, args->csa_cachethis,
482 args->csa_nrclists);
483out:
484 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
485 return status;
486
487out_free:
488 for (i = 0; i < args->csa_nrclists; i++)
489 kfree(args->csa_rclists[i].rcl_refcalls);
490 kfree(args->csa_rclists);
491 goto out;
492}
493
494static __be32 decode_recallany_args(struct svc_rqst *rqstp,
495 struct xdr_stream *xdr,
496 struct cb_recallanyargs *args)
497{
498 uint32_t bitmap[2];
499 __be32 *p, status;
500
501 args->craa_addr = svc_addr(rqstp);
502 p = read_buf(xdr, 4);
503 if (unlikely(p == NULL))
504 return htonl(NFS4ERR_BADXDR);
505 args->craa_objs_to_keep = ntohl(*p++);
506 status = decode_bitmap(xdr, bitmap);
507 if (unlikely(status))
508 return status;
509 args->craa_type_mask = bitmap[0];
510
511 return 0;
512}
513
514static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
515 struct xdr_stream *xdr,
516 struct cb_recallslotargs *args)
517{
518 __be32 *p;
519
520 args->crsa_addr = svc_addr(rqstp);
521 p = read_buf(xdr, 4);
522 if (unlikely(p == NULL))
523 return htonl(NFS4ERR_BADXDR);
524 args->crsa_target_highest_slotid = ntohl(*p++);
525 return 0;
526}
527
528#endif /* CONFIG_NFS_V4_1 */
529
530static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
531{
532 __be32 *p;
533
534 p = xdr_reserve_space(xdr, 4 + len);
535 if (unlikely(p == NULL))
536 return htonl(NFS4ERR_RESOURCE);
537 xdr_encode_opaque(p, str, len);
538 return 0;
539}
540
541#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
542#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
543static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
544{
545 __be32 bm[2];
546 __be32 *p;
547
548 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
549 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
550 if (bm[1] != 0) {
551 p = xdr_reserve_space(xdr, 16);
552 if (unlikely(p == NULL))
553 return htonl(NFS4ERR_RESOURCE);
554 *p++ = htonl(2);
555 *p++ = bm[0];
556 *p++ = bm[1];
557 } else if (bm[0] != 0) {
558 p = xdr_reserve_space(xdr, 12);
559 if (unlikely(p == NULL))
560 return htonl(NFS4ERR_RESOURCE);
561 *p++ = htonl(1);
562 *p++ = bm[0];
563 } else {
564 p = xdr_reserve_space(xdr, 8);
565 if (unlikely(p == NULL))
566 return htonl(NFS4ERR_RESOURCE);
567 *p++ = htonl(0);
568 }
569 *savep = p;
570 return 0;
571}
572
573static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
574{
575 __be32 *p;
576
577 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
578 return 0;
579 p = xdr_reserve_space(xdr, 8);
580 if (unlikely(!p))
581 return htonl(NFS4ERR_RESOURCE);
582 p = xdr_encode_hyper(p, change);
583 return 0;
584}
585
586static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
587{
588 __be32 *p;
589
590 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
591 return 0;
592 p = xdr_reserve_space(xdr, 8);
593 if (unlikely(!p))
594 return htonl(NFS4ERR_RESOURCE);
595 p = xdr_encode_hyper(p, size);
596 return 0;
597}
598
599static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
600{
601 __be32 *p;
602
603 p = xdr_reserve_space(xdr, 12);
604 if (unlikely(!p))
605 return htonl(NFS4ERR_RESOURCE);
606 p = xdr_encode_hyper(p, time->tv_sec);
607 *p = htonl(time->tv_nsec);
608 return 0;
609}
610
611static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
612{
613 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
614 return 0;
615 return encode_attr_time(xdr,time);
616}
617
618static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
619{
620 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
621 return 0;
622 return encode_attr_time(xdr,time);
623}
624
625static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
626{
627 __be32 status;
628
629 hdr->status = xdr_reserve_space(xdr, 4);
630 if (unlikely(hdr->status == NULL))
631 return htonl(NFS4ERR_RESOURCE);
632 status = encode_string(xdr, hdr->taglen, hdr->tag);
633 if (unlikely(status != 0))
634 return status;
635 hdr->nops = xdr_reserve_space(xdr, 4);
636 if (unlikely(hdr->nops == NULL))
637 return htonl(NFS4ERR_RESOURCE);
638 return 0;
639}
640
641static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
642{
643 __be32 *p;
644
645 p = xdr_reserve_space(xdr, 8);
646 if (unlikely(p == NULL))
647 return htonl(NFS4ERR_RESOURCE_HDR);
648 *p++ = htonl(op);
649 *p = res;
650 return 0;
651}
652
653static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
654{
655 __be32 *savep = NULL;
656 __be32 status = res->status;
657
658 if (unlikely(status != 0))
659 goto out;
660 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
661 if (unlikely(status != 0))
662 goto out;
663 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
664 if (unlikely(status != 0))
665 goto out;
666 status = encode_attr_size(xdr, res->bitmap, res->size);
667 if (unlikely(status != 0))
668 goto out;
669 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
670 if (unlikely(status != 0))
671 goto out;
672 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
673 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
674out:
675 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
676 return status;
677}
678
679#if defined(CONFIG_NFS_V4_1)
680
681static __be32 encode_sessionid(struct xdr_stream *xdr,
682 const struct nfs4_sessionid *sid)
683{
684 __be32 *p;
685 int len = NFS4_MAX_SESSIONID_LEN;
686
687 p = xdr_reserve_space(xdr, len);
688 if (unlikely(p == NULL))
689 return htonl(NFS4ERR_RESOURCE);
690
691 memcpy(p, sid, len);
692 return 0;
693}
694
695static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
696 struct xdr_stream *xdr,
697 const struct cb_sequenceres *res)
698{
699 __be32 *p;
700 __be32 status = res->csr_status;
701
702 if (unlikely(status != 0))
703 goto out;
704
705 encode_sessionid(xdr, &res->csr_sessionid);
706
707 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
708 if (unlikely(p == NULL))
709 return htonl(NFS4ERR_RESOURCE);
710
711 *p++ = htonl(res->csr_sequenceid);
712 *p++ = htonl(res->csr_slotid);
713 *p++ = htonl(res->csr_highestslotid);
714 *p++ = htonl(res->csr_target_highestslotid);
715out:
716 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
717 return status;
718}
719
720static __be32
721preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
722{
723 if (op_nr == OP_CB_SEQUENCE) {
724 if (nop != 0)
725 return htonl(NFS4ERR_SEQUENCE_POS);
726 } else {
727 if (nop == 0)
728 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
729 }
730
731 switch (op_nr) {
732 case OP_CB_GETATTR:
733 case OP_CB_RECALL:
734 case OP_CB_SEQUENCE:
735 case OP_CB_RECALL_ANY:
736 case OP_CB_RECALL_SLOT:
737 case OP_CB_LAYOUTRECALL:
738 case OP_CB_NOTIFY_DEVICEID:
739 *op = &callback_ops[op_nr];
740 break;
741
742 case OP_CB_NOTIFY:
743 case OP_CB_PUSH_DELEG:
744 case OP_CB_RECALLABLE_OBJ_AVAIL:
745 case OP_CB_WANTS_CANCELLED:
746 case OP_CB_NOTIFY_LOCK:
747 return htonl(NFS4ERR_NOTSUPP);
748
749 default:
750 return htonl(NFS4ERR_OP_ILLEGAL);
751 }
752
753 return htonl(NFS_OK);
754}
755
756static void nfs4_callback_free_slot(struct nfs4_session *session)
757{
758 struct nfs4_slot_table *tbl = &session->bc_slot_table;
759
760 spin_lock(&tbl->slot_tbl_lock);
761 /*
762 * Let the state manager know callback processing done.
763 * A single slot, so highest used slotid is either 0 or -1
764 */
765 tbl->highest_used_slotid = NFS4_NO_SLOT;
766 nfs4_slot_tbl_drain_complete(tbl);
767 spin_unlock(&tbl->slot_tbl_lock);
768}
769
770static void nfs4_cb_free_slot(struct cb_process_state *cps)
771{
772 if (cps->slotid != NFS4_NO_SLOT)
773 nfs4_callback_free_slot(cps->clp->cl_session);
774}
775
776#else /* CONFIG_NFS_V4_1 */
777
778static __be32
779preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
780{
781 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
782}
783
784static void nfs4_cb_free_slot(struct cb_process_state *cps)
785{
786}
787#endif /* CONFIG_NFS_V4_1 */
788
789#ifdef CONFIG_NFS_V4_2
790static __be32
791preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
792{
793 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
794 if (status != htonl(NFS4ERR_OP_ILLEGAL))
795 return status;
796
797 if (op_nr == OP_CB_OFFLOAD)
798 return htonl(NFS4ERR_NOTSUPP);
799 return htonl(NFS4ERR_OP_ILLEGAL);
800}
801#else /* CONFIG_NFS_V4_2 */
802static __be32
803preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
804{
805 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
806}
807#endif /* CONFIG_NFS_V4_2 */
808
809static __be32
810preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
811{
812 switch (op_nr) {
813 case OP_CB_GETATTR:
814 case OP_CB_RECALL:
815 *op = &callback_ops[op_nr];
816 break;
817 default:
818 return htonl(NFS4ERR_OP_ILLEGAL);
819 }
820
821 return htonl(NFS_OK);
822}
823
824static __be32 process_op(int nop, struct svc_rqst *rqstp,
825 struct xdr_stream *xdr_in, void *argp,
826 struct xdr_stream *xdr_out, void *resp,
827 struct cb_process_state *cps)
828{
829 struct callback_op *op = &callback_ops[0];
830 unsigned int op_nr;
831 __be32 status;
832 long maxlen;
833 __be32 res;
834
835 dprintk("%s: start\n", __func__);
836 status = decode_op_hdr(xdr_in, &op_nr);
837 if (unlikely(status))
838 return status;
839
840 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
841 __func__, cps->minorversion, nop, op_nr);
842
843 switch (cps->minorversion) {
844 case 0:
845 status = preprocess_nfs4_op(op_nr, &op);
846 break;
847 case 1:
848 status = preprocess_nfs41_op(nop, op_nr, &op);
849 break;
850 case 2:
851 status = preprocess_nfs42_op(nop, op_nr, &op);
852 break;
853 default:
854 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
855 }
856
857 if (status == htonl(NFS4ERR_OP_ILLEGAL))
858 op_nr = OP_CB_ILLEGAL;
859 if (status)
860 goto encode_hdr;
861
862 if (cps->drc_status) {
863 status = cps->drc_status;
864 goto encode_hdr;
865 }
866
867 maxlen = xdr_out->end - xdr_out->p;
868 if (maxlen > 0 && maxlen < PAGE_SIZE) {
869 status = op->decode_args(rqstp, xdr_in, argp);
870 if (likely(status == 0))
871 status = op->process_op(argp, resp, cps);
872 } else
873 status = htonl(NFS4ERR_RESOURCE);
874
875encode_hdr:
876 res = encode_op_hdr(xdr_out, op_nr, status);
877 if (unlikely(res))
878 return res;
879 if (op->encode_res != NULL && status == 0)
880 status = op->encode_res(rqstp, xdr_out, resp);
881 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
882 return status;
883}
884
885/*
886 * Decode, process and encode a COMPOUND
887 */
888static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
889{
890 struct cb_compound_hdr_arg hdr_arg = { 0 };
891 struct cb_compound_hdr_res hdr_res = { NULL };
892 struct xdr_stream xdr_in, xdr_out;
893 __be32 *p, status;
894 struct cb_process_state cps = {
895 .drc_status = 0,
896 .clp = NULL,
897 .slotid = NFS4_NO_SLOT,
898 .net = SVC_NET(rqstp),
899 };
900 unsigned int nops = 0;
901
902 dprintk("%s: start\n", __func__);
903
904 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
905
906 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
907 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
908
909 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
910 if (status == __constant_htonl(NFS4ERR_RESOURCE))
911 return rpc_garbage_args;
912
913 if (hdr_arg.minorversion == 0) {
914 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
915 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
916 return rpc_drop_reply;
917 }
918
919 cps.minorversion = hdr_arg.minorversion;
920 hdr_res.taglen = hdr_arg.taglen;
921 hdr_res.tag = hdr_arg.tag;
922 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
923 return rpc_system_err;
924
925 while (status == 0 && nops != hdr_arg.nops) {
926 status = process_op(nops, rqstp, &xdr_in,
927 argp, &xdr_out, resp, &cps);
928 nops++;
929 }
930
931 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
932 * resource error in cb_compound status without returning op */
933 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
934 status = htonl(NFS4ERR_RESOURCE);
935 nops--;
936 }
937
938 *hdr_res.status = status;
939 *hdr_res.nops = htonl(nops);
940 nfs4_cb_free_slot(&cps);
941 nfs_put_client(cps.clp);
942 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
943 return rpc_success;
944}
945
946/*
947 * Define NFS4 callback COMPOUND ops.
948 */
949static struct callback_op callback_ops[] = {
950 [0] = {
951 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
952 },
953 [OP_CB_GETATTR] = {
954 .process_op = (callback_process_op_t)nfs4_callback_getattr,
955 .decode_args = (callback_decode_arg_t)decode_getattr_args,
956 .encode_res = (callback_encode_res_t)encode_getattr_res,
957 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
958 },
959 [OP_CB_RECALL] = {
960 .process_op = (callback_process_op_t)nfs4_callback_recall,
961 .decode_args = (callback_decode_arg_t)decode_recall_args,
962 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
963 },
964#if defined(CONFIG_NFS_V4_1)
965 [OP_CB_LAYOUTRECALL] = {
966 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
967 .decode_args =
968 (callback_decode_arg_t)decode_layoutrecall_args,
969 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
970 },
971 [OP_CB_NOTIFY_DEVICEID] = {
972 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
973 .decode_args =
974 (callback_decode_arg_t)decode_devicenotify_args,
975 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
976 },
977 [OP_CB_SEQUENCE] = {
978 .process_op = (callback_process_op_t)nfs4_callback_sequence,
979 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
980 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
981 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
982 },
983 [OP_CB_RECALL_ANY] = {
984 .process_op = (callback_process_op_t)nfs4_callback_recallany,
985 .decode_args = (callback_decode_arg_t)decode_recallany_args,
986 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
987 },
988 [OP_CB_RECALL_SLOT] = {
989 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
990 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
991 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
992 },
993#endif /* CONFIG_NFS_V4_1 */
994};
995
996/*
997 * Define NFS4 callback procedures
998 */
999static struct svc_procedure nfs4_callback_procedures1[] = {
1000 [CB_NULL] = {
1001 .pc_func = nfs4_callback_null,
1002 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1003 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1004 .pc_xdrressize = 1,
1005 },
1006 [CB_COMPOUND] = {
1007 .pc_func = nfs4_callback_compound,
1008 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1009 .pc_argsize = 256,
1010 .pc_ressize = 256,
1011 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1012 }
1013};
1014
1015struct svc_version nfs4_callback_version1 = {
1016 .vs_vers = 1,
1017 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1018 .vs_proc = nfs4_callback_procedures1,
1019 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1020 .vs_dispatch = NULL,
1021 .vs_hidden = 1,
1022};
1023
1024struct svc_version nfs4_callback_version4 = {
1025 .vs_vers = 4,
1026 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1027 .vs_proc = nfs4_callback_procedures1,
1028 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1029 .vs_dispatch = NULL,
1030 .vs_hidden = 1,
1031};