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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)
25#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4)
26#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
27 CB_OP_GETATTR_BITMAP_MAXSZ + \
28 \
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)
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
42#ifdef CONFIG_NFS_V4_2
43#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
44#endif
45
46#define NFSDBG_FACILITY NFSDBG_CALLBACK
47
48
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
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
154 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
155 hdr->cb_ident = ntohl(*p++);
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
226
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
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
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++);
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++);
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
498 if (len == 20) {
499 p += 2;
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
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
531 p = xdr_inline_decode(xdr, 4);
532 if (unlikely(!p))
533 goto out;
534 p++;
535
536
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
561 status = decode_fh(xdr, &args->coa_fh);
562 if (unlikely(status != 0))
563 return status;
564
565
566 status = decode_stateid(xdr, &args->coa_stateid);
567 if (unlikely(status != 0))
568 return status;
569
570
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
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 timespec64 *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 timespec64 *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 timespec64 *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
800
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
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
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
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
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 cb_process_state *cps)
867{
868 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
869 struct callback_op *op = &callback_ops[0];
870 unsigned int op_nr;
871 __be32 status;
872 long maxlen;
873 __be32 res;
874
875 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
876 if (unlikely(status))
877 return status;
878
879 switch (cps->minorversion) {
880 case 0:
881 status = preprocess_nfs4_op(op_nr, &op);
882 break;
883 case 1:
884 status = preprocess_nfs41_op(nop, op_nr, &op);
885 break;
886 case 2:
887 status = preprocess_nfs42_op(nop, op_nr, &op);
888 break;
889 default:
890 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
891 }
892
893 if (status == htonl(NFS4ERR_OP_ILLEGAL))
894 op_nr = OP_CB_ILLEGAL;
895 if (status)
896 goto encode_hdr;
897
898 if (cps->drc_status) {
899 status = cps->drc_status;
900 goto encode_hdr;
901 }
902
903 maxlen = xdr_out->end - xdr_out->p;
904 if (maxlen > 0 && maxlen < PAGE_SIZE) {
905 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
906 rqstp->rq_argp);
907 if (likely(status == 0))
908 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
909 cps);
910 } else
911 status = htonl(NFS4ERR_RESOURCE);
912
913encode_hdr:
914 res = encode_op_hdr(xdr_out, op_nr, status);
915 if (unlikely(res))
916 return res;
917 if (op->encode_res != NULL && status == 0)
918 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
919 return status;
920}
921
922
923
924
925static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
926{
927 struct cb_compound_hdr_arg hdr_arg = { 0 };
928 struct cb_compound_hdr_res hdr_res = { NULL };
929 struct cb_process_state cps = {
930 .drc_status = 0,
931 .clp = NULL,
932 .net = SVC_NET(rqstp),
933 };
934 unsigned int nops = 0;
935 __be32 status;
936
937 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
938 if (status == htonl(NFS4ERR_RESOURCE))
939 return rpc_garbage_args;
940
941 if (hdr_arg.minorversion == 0) {
942 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
943 if (!cps.clp) {
944 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
945 goto out_invalidcred;
946 }
947 if (!check_gss_callback_principal(cps.clp, rqstp)) {
948 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
949 nfs_put_client(cps.clp);
950 goto out_invalidcred;
951 }
952 }
953
954 cps.minorversion = hdr_arg.minorversion;
955 hdr_res.taglen = hdr_arg.taglen;
956 hdr_res.tag = hdr_arg.tag;
957 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
958 if (cps.clp)
959 nfs_put_client(cps.clp);
960 return rpc_system_err;
961 }
962 while (status == 0 && nops != hdr_arg.nops) {
963 status = process_op(nops, rqstp, &cps);
964 nops++;
965 }
966
967
968
969 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
970 status = htonl(NFS4ERR_RESOURCE);
971 nops--;
972 }
973
974 *hdr_res.status = status;
975 *hdr_res.nops = htonl(nops);
976 nfs4_cb_free_slot(&cps);
977 nfs_put_client(cps.clp);
978 return rpc_success;
979
980out_invalidcred:
981 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
982 rqstp->rq_auth_stat = rpc_autherr_badcred;
983 return rpc_success;
984}
985
986static int
987nfs_callback_dispatch(struct svc_rqst *rqstp, __be32 *statp)
988{
989 const struct svc_procedure *procp = rqstp->rq_procinfo;
990
991 svcxdr_init_decode(rqstp);
992 svcxdr_init_encode(rqstp);
993
994 *statp = procp->pc_func(rqstp);
995 return 1;
996}
997
998
999
1000
1001static struct callback_op callback_ops[] = {
1002 [0] = {
1003 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1004 },
1005 [OP_CB_GETATTR] = {
1006 .process_op = nfs4_callback_getattr,
1007 .decode_args = decode_getattr_args,
1008 .encode_res = encode_getattr_res,
1009 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1010 },
1011 [OP_CB_RECALL] = {
1012 .process_op = nfs4_callback_recall,
1013 .decode_args = decode_recall_args,
1014 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1015 },
1016#if defined(CONFIG_NFS_V4_1)
1017 [OP_CB_LAYOUTRECALL] = {
1018 .process_op = nfs4_callback_layoutrecall,
1019 .decode_args = decode_layoutrecall_args,
1020 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1021 },
1022 [OP_CB_NOTIFY_DEVICEID] = {
1023 .process_op = nfs4_callback_devicenotify,
1024 .decode_args = decode_devicenotify_args,
1025 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1026 },
1027 [OP_CB_SEQUENCE] = {
1028 .process_op = nfs4_callback_sequence,
1029 .decode_args = decode_cb_sequence_args,
1030 .encode_res = encode_cb_sequence_res,
1031 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1032 },
1033 [OP_CB_RECALL_ANY] = {
1034 .process_op = nfs4_callback_recallany,
1035 .decode_args = decode_recallany_args,
1036 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1037 },
1038 [OP_CB_RECALL_SLOT] = {
1039 .process_op = nfs4_callback_recallslot,
1040 .decode_args = decode_recallslot_args,
1041 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1042 },
1043 [OP_CB_NOTIFY_LOCK] = {
1044 .process_op = nfs4_callback_notify_lock,
1045 .decode_args = decode_notify_lock_args,
1046 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1047 },
1048#endif
1049#ifdef CONFIG_NFS_V4_2
1050 [OP_CB_OFFLOAD] = {
1051 .process_op = nfs4_callback_offload,
1052 .decode_args = decode_offload_args,
1053 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1054 },
1055#endif
1056};
1057
1058
1059
1060
1061static const struct svc_procedure nfs4_callback_procedures1[] = {
1062 [CB_NULL] = {
1063 .pc_func = nfs4_callback_null,
1064 .pc_encode = nfs4_encode_void,
1065 .pc_xdrressize = 1,
1066 .pc_name = "NULL",
1067 },
1068 [CB_COMPOUND] = {
1069 .pc_func = nfs4_callback_compound,
1070 .pc_encode = nfs4_encode_void,
1071 .pc_argsize = 256,
1072 .pc_ressize = 256,
1073 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1074 .pc_name = "COMPOUND",
1075 }
1076};
1077
1078static unsigned int 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 unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1091const struct svc_version nfs4_callback_version4 = {
1092 .vs_vers = 4,
1093 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1094 .vs_proc = nfs4_callback_procedures1,
1095 .vs_count = nfs4_callback_count4,
1096 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1097 .vs_dispatch = nfs_callback_dispatch,
1098 .vs_hidden = true,
1099 .vs_need_cong_ctrl = true,
1100};
1101
