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