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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/callback_xdr.c
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback encode/decode procedures
8 */
9#include <linux/kernel.h>
10#include <linux/sunrpc/svc.h>
11#include <linux/nfs4.h>
12#include <linux/nfs_fs.h>
13#include <linux/ratelimit.h>
14#include <linux/printk.h>
15#include <linux/slab.h>
16#include <linux/sunrpc/bc_xprt.h>
17#include "nfs4_fs.h"
18#include "callback.h"
19#include "internal.h"
20#include "nfs4session.h"
21
22#define CB_OP_TAGLEN_MAXSZ (512)
23#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
24#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
25#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
26 CB_OP_GETATTR_BITMAP_MAXSZ + \
27 /* change, size, ctime, mtime */\
28 (2 + 2 + 3 + 3) * 4)
29#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30
31#if defined(CONFIG_NFS_V4_1)
32#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
35 NFS4_MAX_SESSIONID_LEN + \
36 (1 + 3) * 4) // seqid, 3 slotids
37#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40#endif /* CONFIG_NFS_V4_1 */
41
42#define NFSDBG_FACILITY NFSDBG_CALLBACK
43
44/* Internal error code */
45#define NFS4ERR_RESOURCE_HDR 11050
46
47struct callback_op {
48 __be32 (*process_op)(void *, void *, struct cb_process_state *);
49 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
50 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
51 const void *);
52 long res_maxsize;
53};
54
55static struct callback_op callback_ops[];
56
57static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
58{
59 return htonl(NFS4_OK);
60}
61
62static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
63{
64 return xdr_argsize_check(rqstp, p);
65}
66
67static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
68{
69 return xdr_ressize_check(rqstp, p);
70}
71
72static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
73{
74 __be32 *p;
75
76 p = xdr_inline_decode(xdr, nbytes);
77 if (unlikely(p == NULL))
78 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
79 return p;
80}
81
82static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
83 const char **str, size_t maxlen)
84{
85 ssize_t err;
86
87 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
88 if (err < 0)
89 return cpu_to_be32(NFS4ERR_RESOURCE);
90 *len = err;
91 return 0;
92}
93
94static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
95{
96 __be32 *p;
97
98 p = read_buf(xdr, 4);
99 if (unlikely(p == NULL))
100 return htonl(NFS4ERR_RESOURCE);
101 fh->size = ntohl(*p);
102 if (fh->size > NFS4_FHSIZE)
103 return htonl(NFS4ERR_BADHANDLE);
104 p = read_buf(xdr, fh->size);
105 if (unlikely(p == NULL))
106 return htonl(NFS4ERR_RESOURCE);
107 memcpy(&fh->data[0], p, fh->size);
108 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
109 return 0;
110}
111
112static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
113{
114 __be32 *p;
115 unsigned int attrlen;
116
117 p = read_buf(xdr, 4);
118 if (unlikely(p == NULL))
119 return htonl(NFS4ERR_RESOURCE);
120 attrlen = ntohl(*p);
121 p = read_buf(xdr, attrlen << 2);
122 if (unlikely(p == NULL))
123 return htonl(NFS4ERR_RESOURCE);
124 if (likely(attrlen > 0))
125 bitmap[0] = ntohl(*p++);
126 if (attrlen > 1)
127 bitmap[1] = ntohl(*p);
128 return 0;
129}
130
131static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
132{
133 __be32 *p;
134
135 p = read_buf(xdr, NFS4_STATEID_SIZE);
136 if (unlikely(p == NULL))
137 return htonl(NFS4ERR_RESOURCE);
138 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
139 return 0;
140}
141
142static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
143{
144 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
145 return decode_stateid(xdr, stateid);
146}
147
148static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
149{
150 __be32 *p;
151 __be32 status;
152
153 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
154 if (unlikely(status != 0))
155 return status;
156 p = read_buf(xdr, 12);
157 if (unlikely(p == NULL))
158 return htonl(NFS4ERR_RESOURCE);
159 hdr->minorversion = ntohl(*p++);
160 /* Check for minor version support */
161 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
162 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
163 } else {
164 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
165 "illegal minor version %u!\n",
166 __func__, hdr->minorversion);
167 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
168 }
169 hdr->nops = ntohl(*p);
170 return 0;
171}
172
173static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
174{
175 __be32 *p;
176 p = read_buf(xdr, 4);
177 if (unlikely(p == NULL))
178 return htonl(NFS4ERR_RESOURCE_HDR);
179 *op = ntohl(*p);
180 return 0;
181}
182
183static __be32 decode_getattr_args(struct svc_rqst *rqstp,
184 struct xdr_stream *xdr, void *argp)
185{
186 struct cb_getattrargs *args = argp;
187 __be32 status;
188
189 status = decode_fh(xdr, &args->fh);
190 if (unlikely(status != 0))
191 return status;
192 return decode_bitmap(xdr, args->bitmap);
193}
194
195static __be32 decode_recall_args(struct svc_rqst *rqstp,
196 struct xdr_stream *xdr, void *argp)
197{
198 struct cb_recallargs *args = argp;
199 __be32 *p;
200 __be32 status;
201
202 status = decode_delegation_stateid(xdr, &args->stateid);
203 if (unlikely(status != 0))
204 return status;
205 p = read_buf(xdr, 4);
206 if (unlikely(p == NULL))
207 return htonl(NFS4ERR_RESOURCE);
208 args->truncate = ntohl(*p);
209 return decode_fh(xdr, &args->fh);
210}
211
212#if defined(CONFIG_NFS_V4_1)
213static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
214{
215 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
216 return decode_stateid(xdr, stateid);
217}
218
219static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
220 struct xdr_stream *xdr, void *argp)
221{
222 struct cb_layoutrecallargs *args = argp;
223 __be32 *p;
224 __be32 status = 0;
225 uint32_t iomode;
226
227 p = read_buf(xdr, 4 * sizeof(uint32_t));
228 if (unlikely(p == NULL))
229 return htonl(NFS4ERR_BADXDR);
230
231 args->cbl_layout_type = ntohl(*p++);
232 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
233 * as it is unusable and ignored with the other types.
234 */
235 iomode = ntohl(*p++);
236 args->cbl_layoutchanged = ntohl(*p++);
237 args->cbl_recall_type = ntohl(*p++);
238
239 if (args->cbl_recall_type == RETURN_FILE) {
240 args->cbl_range.iomode = iomode;
241 status = decode_fh(xdr, &args->cbl_fh);
242 if (unlikely(status != 0))
243 return status;
244
245 p = read_buf(xdr, 2 * sizeof(uint64_t));
246 if (unlikely(p == NULL))
247 return htonl(NFS4ERR_BADXDR);
248 p = xdr_decode_hyper(p, &args->cbl_range.offset);
249 p = xdr_decode_hyper(p, &args->cbl_range.length);
250 return decode_layout_stateid(xdr, &args->cbl_stateid);
251 } else if (args->cbl_recall_type == RETURN_FSID) {
252 p = read_buf(xdr, 2 * sizeof(uint64_t));
253 if (unlikely(p == NULL))
254 return htonl(NFS4ERR_BADXDR);
255 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
256 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
257 } else if (args->cbl_recall_type != RETURN_ALL)
258 return htonl(NFS4ERR_BADXDR);
259 return 0;
260}
261
262static
263__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
264 struct xdr_stream *xdr,
265 void *argp)
266{
267 struct cb_devicenotifyargs *args = argp;
268 __be32 *p;
269 __be32 status = 0;
270 u32 tmp;
271 int n, i;
272 args->ndevs = 0;
273
274 /* Num of device notifications */
275 p = read_buf(xdr, sizeof(uint32_t));
276 if (unlikely(p == NULL)) {
277 status = htonl(NFS4ERR_BADXDR);
278 goto out;
279 }
280 n = ntohl(*p++);
281 if (n <= 0)
282 goto out;
283 if (n > ULONG_MAX / sizeof(*args->devs)) {
284 status = htonl(NFS4ERR_BADXDR);
285 goto out;
286 }
287
288 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
289 if (!args->devs) {
290 status = htonl(NFS4ERR_DELAY);
291 goto out;
292 }
293
294 /* Decode each dev notification */
295 for (i = 0; i < n; i++) {
296 struct cb_devicenotifyitem *dev = &args->devs[i];
297
298 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
299 if (unlikely(p == NULL)) {
300 status = htonl(NFS4ERR_BADXDR);
301 goto err;
302 }
303
304 tmp = ntohl(*p++); /* bitmap size */
305 if (tmp != 1) {
306 status = htonl(NFS4ERR_INVAL);
307 goto err;
308 }
309 dev->cbd_notify_type = ntohl(*p++);
310 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
311 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
312 status = htonl(NFS4ERR_INVAL);
313 goto err;
314 }
315
316 tmp = ntohl(*p++); /* opaque size */
317 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
318 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
319 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
320 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
321 status = htonl(NFS4ERR_INVAL);
322 goto err;
323 }
324 dev->cbd_layout_type = ntohl(*p++);
325 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
326 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
327
328 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
329 p = read_buf(xdr, sizeof(uint32_t));
330 if (unlikely(p == NULL)) {
331 status = htonl(NFS4ERR_BADXDR);
332 goto err;
333 }
334 dev->cbd_immediate = ntohl(*p++);
335 } else {
336 dev->cbd_immediate = 0;
337 }
338
339 args->ndevs++;
340
341 dprintk("%s: type %d layout 0x%x immediate %d\n",
342 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
343 dev->cbd_immediate);
344 }
345out:
346 dprintk("%s: status %d ndevs %d\n",
347 __func__, ntohl(status), args->ndevs);
348 return status;
349err:
350 kfree(args->devs);
351 goto out;
352}
353
354static __be32 decode_sessionid(struct xdr_stream *xdr,
355 struct nfs4_sessionid *sid)
356{
357 __be32 *p;
358
359 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
360 if (unlikely(p == NULL))
361 return htonl(NFS4ERR_RESOURCE);
362
363 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
364 return 0;
365}
366
367static __be32 decode_rc_list(struct xdr_stream *xdr,
368 struct referring_call_list *rc_list)
369{
370 __be32 *p;
371 int i;
372 __be32 status;
373
374 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
375 if (status)
376 goto out;
377
378 status = htonl(NFS4ERR_RESOURCE);
379 p = read_buf(xdr, sizeof(uint32_t));
380 if (unlikely(p == NULL))
381 goto out;
382
383 rc_list->rcl_nrefcalls = ntohl(*p++);
384 if (rc_list->rcl_nrefcalls) {
385 p = read_buf(xdr,
386 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
387 if (unlikely(p == NULL))
388 goto out;
389 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
390 sizeof(*rc_list->rcl_refcalls),
391 GFP_KERNEL);
392 if (unlikely(rc_list->rcl_refcalls == NULL))
393 goto out;
394 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
395 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
396 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
397 }
398 }
399 status = 0;
400
401out:
402 return status;
403}
404
405static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
406 struct xdr_stream *xdr,
407 void *argp)
408{
409 struct cb_sequenceargs *args = argp;
410 __be32 *p;
411 int i;
412 __be32 status;
413
414 status = decode_sessionid(xdr, &args->csa_sessionid);
415 if (status)
416 return status;
417
418 p = read_buf(xdr, 5 * sizeof(uint32_t));
419 if (unlikely(p == NULL))
420 return htonl(NFS4ERR_RESOURCE);
421
422 args->csa_addr = svc_addr(rqstp);
423 args->csa_sequenceid = ntohl(*p++);
424 args->csa_slotid = ntohl(*p++);
425 args->csa_highestslotid = ntohl(*p++);
426 args->csa_cachethis = ntohl(*p++);
427 args->csa_nrclists = ntohl(*p++);
428 args->csa_rclists = NULL;
429 if (args->csa_nrclists) {
430 args->csa_rclists = kmalloc_array(args->csa_nrclists,
431 sizeof(*args->csa_rclists),
432 GFP_KERNEL);
433 if (unlikely(args->csa_rclists == NULL))
434 return htonl(NFS4ERR_RESOURCE);
435
436 for (i = 0; i < args->csa_nrclists; i++) {
437 status = decode_rc_list(xdr, &args->csa_rclists[i]);
438 if (status) {
439 args->csa_nrclists = i;
440 goto out_free;
441 }
442 }
443 }
444 return 0;
445
446out_free:
447 for (i = 0; i < args->csa_nrclists; i++)
448 kfree(args->csa_rclists[i].rcl_refcalls);
449 kfree(args->csa_rclists);
450 return status;
451}
452
453static __be32 decode_recallany_args(struct svc_rqst *rqstp,
454 struct xdr_stream *xdr,
455 void *argp)
456{
457 struct cb_recallanyargs *args = argp;
458 uint32_t bitmap[2];
459 __be32 *p, status;
460
461 p = read_buf(xdr, 4);
462 if (unlikely(p == NULL))
463 return htonl(NFS4ERR_BADXDR);
464 args->craa_objs_to_keep = ntohl(*p++);
465 status = decode_bitmap(xdr, bitmap);
466 if (unlikely(status))
467 return status;
468 args->craa_type_mask = bitmap[0];
469
470 return 0;
471}
472
473static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
474 struct xdr_stream *xdr,
475 void *argp)
476{
477 struct cb_recallslotargs *args = argp;
478 __be32 *p;
479
480 p = read_buf(xdr, 4);
481 if (unlikely(p == NULL))
482 return htonl(NFS4ERR_BADXDR);
483 args->crsa_target_highest_slotid = ntohl(*p++);
484 return 0;
485}
486
487static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
488{
489 __be32 *p;
490 unsigned int len;
491
492 p = read_buf(xdr, 12);
493 if (unlikely(p == NULL))
494 return htonl(NFS4ERR_BADXDR);
495
496 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
497 len = be32_to_cpu(*p);
498
499 p = read_buf(xdr, len);
500 if (unlikely(p == NULL))
501 return htonl(NFS4ERR_BADXDR);
502
503 /* Only try to decode if the length is right */
504 if (len == 20) {
505 p += 2; /* skip "lock id:" */
506 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
507 xdr_decode_hyper(p, &args->cbnl_owner.id);
508 args->cbnl_valid = true;
509 } else {
510 args->cbnl_owner.s_dev = 0;
511 args->cbnl_owner.id = 0;
512 args->cbnl_valid = false;
513 }
514 return 0;
515}
516
517static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
518 struct xdr_stream *xdr, void *argp)
519{
520 struct cb_notify_lock_args *args = argp;
521 __be32 status;
522
523 status = decode_fh(xdr, &args->cbnl_fh);
524 if (unlikely(status != 0))
525 return status;
526 return decode_lockowner(xdr, args);
527}
528
529#endif /* CONFIG_NFS_V4_1 */
530
531static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
532{
533 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
534 return cpu_to_be32(NFS4ERR_RESOURCE);
535 return 0;
536}
537
538static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
539{
540 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
541 return cpu_to_be32(NFS4ERR_RESOURCE);
542 return 0;
543}
544
545static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
546{
547 __be32 *p;
548
549 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
550 return 0;
551 p = xdr_reserve_space(xdr, 8);
552 if (unlikely(!p))
553 return htonl(NFS4ERR_RESOURCE);
554 p = xdr_encode_hyper(p, change);
555 return 0;
556}
557
558static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
559{
560 __be32 *p;
561
562 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
563 return 0;
564 p = xdr_reserve_space(xdr, 8);
565 if (unlikely(!p))
566 return htonl(NFS4ERR_RESOURCE);
567 p = xdr_encode_hyper(p, size);
568 return 0;
569}
570
571static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
572{
573 __be32 *p;
574
575 p = xdr_reserve_space(xdr, 12);
576 if (unlikely(!p))
577 return htonl(NFS4ERR_RESOURCE);
578 p = xdr_encode_hyper(p, time->tv_sec);
579 *p = htonl(time->tv_nsec);
580 return 0;
581}
582
583static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
584{
585 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
586 return 0;
587 return encode_attr_time(xdr,time);
588}
589
590static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
591{
592 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
593 return 0;
594 return encode_attr_time(xdr,time);
595}
596
597static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
598{
599 __be32 status;
600
601 hdr->status = xdr_reserve_space(xdr, 4);
602 if (unlikely(hdr->status == NULL))
603 return htonl(NFS4ERR_RESOURCE);
604 status = encode_string(xdr, hdr->taglen, hdr->tag);
605 if (unlikely(status != 0))
606 return status;
607 hdr->nops = xdr_reserve_space(xdr, 4);
608 if (unlikely(hdr->nops == NULL))
609 return htonl(NFS4ERR_RESOURCE);
610 return 0;
611}
612
613static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
614{
615 __be32 *p;
616
617 p = xdr_reserve_space(xdr, 8);
618 if (unlikely(p == NULL))
619 return htonl(NFS4ERR_RESOURCE_HDR);
620 *p++ = htonl(op);
621 *p = res;
622 return 0;
623}
624
625static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
626 const void *resp)
627{
628 const struct cb_getattrres *res = resp;
629 __be32 *savep = NULL;
630 __be32 status = res->status;
631
632 if (unlikely(status != 0))
633 goto out;
634 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
635 if (unlikely(status != 0))
636 goto out;
637 status = cpu_to_be32(NFS4ERR_RESOURCE);
638 savep = xdr_reserve_space(xdr, sizeof(*savep));
639 if (unlikely(!savep))
640 goto out;
641 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
642 if (unlikely(status != 0))
643 goto out;
644 status = encode_attr_size(xdr, res->bitmap, res->size);
645 if (unlikely(status != 0))
646 goto out;
647 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
648 if (unlikely(status != 0))
649 goto out;
650 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
651 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
652out:
653 return status;
654}
655
656#if defined(CONFIG_NFS_V4_1)
657
658static __be32 encode_sessionid(struct xdr_stream *xdr,
659 const struct nfs4_sessionid *sid)
660{
661 __be32 *p;
662
663 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
664 if (unlikely(p == NULL))
665 return htonl(NFS4ERR_RESOURCE);
666
667 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
668 return 0;
669}
670
671static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
672 struct xdr_stream *xdr,
673 const void *resp)
674{
675 const struct cb_sequenceres *res = resp;
676 __be32 *p;
677 __be32 status = res->csr_status;
678
679 if (unlikely(status != 0))
680 return status;
681
682 status = encode_sessionid(xdr, &res->csr_sessionid);
683 if (status)
684 return status;
685
686 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
687 if (unlikely(p == NULL))
688 return htonl(NFS4ERR_RESOURCE);
689
690 *p++ = htonl(res->csr_sequenceid);
691 *p++ = htonl(res->csr_slotid);
692 *p++ = htonl(res->csr_highestslotid);
693 *p++ = htonl(res->csr_target_highestslotid);
694 return 0;
695}
696
697static __be32
698preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
699{
700 if (op_nr == OP_CB_SEQUENCE) {
701 if (nop != 0)
702 return htonl(NFS4ERR_SEQUENCE_POS);
703 } else {
704 if (nop == 0)
705 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
706 }
707
708 switch (op_nr) {
709 case OP_CB_GETATTR:
710 case OP_CB_RECALL:
711 case OP_CB_SEQUENCE:
712 case OP_CB_RECALL_ANY:
713 case OP_CB_RECALL_SLOT:
714 case OP_CB_LAYOUTRECALL:
715 case OP_CB_NOTIFY_DEVICEID:
716 case OP_CB_NOTIFY_LOCK:
717 *op = &callback_ops[op_nr];
718 break;
719
720 case OP_CB_NOTIFY:
721 case OP_CB_PUSH_DELEG:
722 case OP_CB_RECALLABLE_OBJ_AVAIL:
723 case OP_CB_WANTS_CANCELLED:
724 return htonl(NFS4ERR_NOTSUPP);
725
726 default:
727 return htonl(NFS4ERR_OP_ILLEGAL);
728 }
729
730 return htonl(NFS_OK);
731}
732
733static void nfs4_callback_free_slot(struct nfs4_session *session,
734 struct nfs4_slot *slot)
735{
736 struct nfs4_slot_table *tbl = &session->bc_slot_table;
737
738 spin_lock(&tbl->slot_tbl_lock);
739 /*
740 * Let the state manager know callback processing done.
741 * A single slot, so highest used slotid is either 0 or -1
742 */
743 nfs4_free_slot(tbl, slot);
744 spin_unlock(&tbl->slot_tbl_lock);
745}
746
747static void nfs4_cb_free_slot(struct cb_process_state *cps)
748{
749 if (cps->slot) {
750 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
751 cps->slot = NULL;
752 }
753}
754
755#else /* CONFIG_NFS_V4_1 */
756
757static __be32
758preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
759{
760 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
761}
762
763static void nfs4_cb_free_slot(struct cb_process_state *cps)
764{
765}
766#endif /* CONFIG_NFS_V4_1 */
767
768#ifdef CONFIG_NFS_V4_2
769static __be32
770preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
771{
772 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
773 if (status != htonl(NFS4ERR_OP_ILLEGAL))
774 return status;
775
776 if (op_nr == OP_CB_OFFLOAD)
777 return htonl(NFS4ERR_NOTSUPP);
778 return htonl(NFS4ERR_OP_ILLEGAL);
779}
780#else /* CONFIG_NFS_V4_2 */
781static __be32
782preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
783{
784 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
785}
786#endif /* CONFIG_NFS_V4_2 */
787
788static __be32
789preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
790{
791 switch (op_nr) {
792 case OP_CB_GETATTR:
793 case OP_CB_RECALL:
794 *op = &callback_ops[op_nr];
795 break;
796 default:
797 return htonl(NFS4ERR_OP_ILLEGAL);
798 }
799
800 return htonl(NFS_OK);
801}
802
803static __be32 process_op(int nop, struct svc_rqst *rqstp,
804 struct xdr_stream *xdr_in, void *argp,
805 struct xdr_stream *xdr_out, void *resp,
806 struct cb_process_state *cps)
807{
808 struct callback_op *op = &callback_ops[0];
809 unsigned int op_nr;
810 __be32 status;
811 long maxlen;
812 __be32 res;
813
814 status = decode_op_hdr(xdr_in, &op_nr);
815 if (unlikely(status))
816 return status;
817
818 switch (cps->minorversion) {
819 case 0:
820 status = preprocess_nfs4_op(op_nr, &op);
821 break;
822 case 1:
823 status = preprocess_nfs41_op(nop, op_nr, &op);
824 break;
825 case 2:
826 status = preprocess_nfs42_op(nop, op_nr, &op);
827 break;
828 default:
829 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
830 }
831
832 if (status == htonl(NFS4ERR_OP_ILLEGAL))
833 op_nr = OP_CB_ILLEGAL;
834 if (status)
835 goto encode_hdr;
836
837 if (cps->drc_status) {
838 status = cps->drc_status;
839 goto encode_hdr;
840 }
841
842 maxlen = xdr_out->end - xdr_out->p;
843 if (maxlen > 0 && maxlen < PAGE_SIZE) {
844 status = op->decode_args(rqstp, xdr_in, argp);
845 if (likely(status == 0))
846 status = op->process_op(argp, resp, cps);
847 } else
848 status = htonl(NFS4ERR_RESOURCE);
849
850encode_hdr:
851 res = encode_op_hdr(xdr_out, op_nr, status);
852 if (unlikely(res))
853 return res;
854 if (op->encode_res != NULL && status == 0)
855 status = op->encode_res(rqstp, xdr_out, resp);
856 return status;
857}
858
859/*
860 * Decode, process and encode a COMPOUND
861 */
862static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
863{
864 struct cb_compound_hdr_arg hdr_arg = { 0 };
865 struct cb_compound_hdr_res hdr_res = { NULL };
866 struct xdr_stream xdr_in, xdr_out;
867 __be32 *p, status;
868 struct cb_process_state cps = {
869 .drc_status = 0,
870 .clp = NULL,
871 .net = SVC_NET(rqstp),
872 };
873 unsigned int nops = 0;
874
875 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
876
877 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
878 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
879
880 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
881 if (status == htonl(NFS4ERR_RESOURCE))
882 return rpc_garbage_args;
883
884 if (hdr_arg.minorversion == 0) {
885 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
886 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
887 goto out_invalidcred;
888 }
889
890 cps.minorversion = hdr_arg.minorversion;
891 hdr_res.taglen = hdr_arg.taglen;
892 hdr_res.tag = hdr_arg.tag;
893 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
894 return rpc_system_err;
895
896 while (status == 0 && nops != hdr_arg.nops) {
897 status = process_op(nops, rqstp, &xdr_in,
898 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
899 &cps);
900 nops++;
901 }
902
903 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
904 * resource error in cb_compound status without returning op */
905 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
906 status = htonl(NFS4ERR_RESOURCE);
907 nops--;
908 }
909
910 *hdr_res.status = status;
911 *hdr_res.nops = htonl(nops);
912 nfs4_cb_free_slot(&cps);
913 nfs_put_client(cps.clp);
914 return rpc_success;
915
916out_invalidcred:
917 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
918 return rpc_autherr_badcred;
919}
920
921/*
922 * Define NFS4 callback COMPOUND ops.
923 */
924static struct callback_op callback_ops[] = {
925 [0] = {
926 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
927 },
928 [OP_CB_GETATTR] = {
929 .process_op = nfs4_callback_getattr,
930 .decode_args = decode_getattr_args,
931 .encode_res = encode_getattr_res,
932 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
933 },
934 [OP_CB_RECALL] = {
935 .process_op = nfs4_callback_recall,
936 .decode_args = decode_recall_args,
937 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
938 },
939#if defined(CONFIG_NFS_V4_1)
940 [OP_CB_LAYOUTRECALL] = {
941 .process_op = nfs4_callback_layoutrecall,
942 .decode_args = decode_layoutrecall_args,
943 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
944 },
945 [OP_CB_NOTIFY_DEVICEID] = {
946 .process_op = nfs4_callback_devicenotify,
947 .decode_args = decode_devicenotify_args,
948 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
949 },
950 [OP_CB_SEQUENCE] = {
951 .process_op = nfs4_callback_sequence,
952 .decode_args = decode_cb_sequence_args,
953 .encode_res = encode_cb_sequence_res,
954 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
955 },
956 [OP_CB_RECALL_ANY] = {
957 .process_op = nfs4_callback_recallany,
958 .decode_args = decode_recallany_args,
959 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
960 },
961 [OP_CB_RECALL_SLOT] = {
962 .process_op = nfs4_callback_recallslot,
963 .decode_args = decode_recallslot_args,
964 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
965 },
966 [OP_CB_NOTIFY_LOCK] = {
967 .process_op = nfs4_callback_notify_lock,
968 .decode_args = decode_notify_lock_args,
969 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
970 },
971#endif /* CONFIG_NFS_V4_1 */
972};
973
974/*
975 * Define NFS4 callback procedures
976 */
977static const struct svc_procedure nfs4_callback_procedures1[] = {
978 [CB_NULL] = {
979 .pc_func = nfs4_callback_null,
980 .pc_decode = nfs4_decode_void,
981 .pc_encode = nfs4_encode_void,
982 .pc_xdrressize = 1,
983 },
984 [CB_COMPOUND] = {
985 .pc_func = nfs4_callback_compound,
986 .pc_encode = nfs4_encode_void,
987 .pc_argsize = 256,
988 .pc_ressize = 256,
989 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
990 }
991};
992
993static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
994const struct svc_version nfs4_callback_version1 = {
995 .vs_vers = 1,
996 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
997 .vs_proc = nfs4_callback_procedures1,
998 .vs_count = nfs4_callback_count1,
999 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1000 .vs_dispatch = NULL,
1001 .vs_hidden = true,
1002 .vs_need_cong_ctrl = true,
1003};
1004
1005static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1006const struct svc_version nfs4_callback_version4 = {
1007 .vs_vers = 4,
1008 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1009 .vs_proc = nfs4_callback_procedures1,
1010 .vs_count = nfs4_callback_count4,
1011 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1012 .vs_dispatch = NULL,
1013 .vs_hidden = true,
1014 .vs_need_cong_ctrl = true,
1015};
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, atime, ctime,
29 * mtime, deleg_atime, deleg_mtime */\
30 (2 + 2 + 3 + 3 + 3 + 3 + 3) * 4)
31#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32
33#if defined(CONFIG_NFS_V4_1)
34#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
36#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
37 NFS4_MAX_SESSIONID_LEN + \
38 (1 + 3) * 4) // seqid, 3 slotids
39#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
41#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
42#endif /* CONFIG_NFS_V4_1 */
43#ifdef CONFIG_NFS_V4_2
44#define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
45#endif /* CONFIG_NFS_V4_2 */
46
47#define NFSDBG_FACILITY NFSDBG_CALLBACK
48
49/* Internal error code */
50#define NFS4ERR_RESOURCE_HDR 11050
51
52struct callback_op {
53 __be32 (*process_op)(void *, void *, struct cb_process_state *);
54 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
55 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
56 const void *);
57 long res_maxsize;
58};
59
60static struct callback_op callback_ops[];
61
62static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
63{
64 return htonl(NFS4_OK);
65}
66
67/*
68 * svc_process_common() looks for an XDR encoder to know when
69 * not to drop a Reply.
70 */
71static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
72{
73 return true;
74}
75
76static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
77 const char **str, size_t maxlen)
78{
79 ssize_t err;
80
81 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
82 if (err < 0)
83 return cpu_to_be32(NFS4ERR_RESOURCE);
84 *len = err;
85 return 0;
86}
87
88static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
89{
90 __be32 *p;
91
92 p = xdr_inline_decode(xdr, 4);
93 if (unlikely(p == NULL))
94 return htonl(NFS4ERR_RESOURCE);
95 fh->size = ntohl(*p);
96 if (fh->size > NFS4_FHSIZE)
97 return htonl(NFS4ERR_BADHANDLE);
98 p = xdr_inline_decode(xdr, fh->size);
99 if (unlikely(p == NULL))
100 return htonl(NFS4ERR_RESOURCE);
101 memcpy(&fh->data[0], p, fh->size);
102 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
103 return 0;
104}
105
106static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
107{
108 __be32 *p;
109 unsigned int attrlen;
110
111 p = xdr_inline_decode(xdr, 4);
112 if (unlikely(p == NULL))
113 return htonl(NFS4ERR_RESOURCE);
114 attrlen = ntohl(*p);
115 p = xdr_inline_decode(xdr, attrlen << 2);
116 if (unlikely(p == NULL))
117 return htonl(NFS4ERR_RESOURCE);
118 if (likely(attrlen > 0))
119 bitmap[0] = ntohl(*p++);
120 if (attrlen > 1)
121 bitmap[1] = ntohl(*p++);
122 if (attrlen > 2)
123 bitmap[2] = ntohl(*p);
124 return 0;
125}
126
127static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
128{
129 __be32 *p;
130
131 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
132 if (unlikely(p == NULL))
133 return htonl(NFS4ERR_RESOURCE);
134 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
135 return 0;
136}
137
138static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
139{
140 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
141 return decode_stateid(xdr, stateid);
142}
143
144static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
145{
146 __be32 *p;
147 __be32 status;
148
149 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
150 if (unlikely(status != 0))
151 return status;
152 p = xdr_inline_decode(xdr, 12);
153 if (unlikely(p == NULL))
154 return htonl(NFS4ERR_RESOURCE);
155 hdr->minorversion = ntohl(*p++);
156 /* Check for minor version support */
157 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
158 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
159 } else {
160 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
161 "illegal minor version %u!\n",
162 __func__, hdr->minorversion);
163 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
164 }
165 hdr->nops = ntohl(*p);
166 return 0;
167}
168
169static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
170{
171 __be32 *p;
172 p = xdr_inline_decode(xdr, 4);
173 if (unlikely(p == NULL))
174 return htonl(NFS4ERR_RESOURCE_HDR);
175 *op = ntohl(*p);
176 return 0;
177}
178
179static __be32 decode_getattr_args(struct svc_rqst *rqstp,
180 struct xdr_stream *xdr, void *argp)
181{
182 struct cb_getattrargs *args = argp;
183 __be32 status;
184
185 status = decode_fh(xdr, &args->fh);
186 if (unlikely(status != 0))
187 return status;
188 return decode_bitmap(xdr, args->bitmap);
189}
190
191static __be32 decode_recall_args(struct svc_rqst *rqstp,
192 struct xdr_stream *xdr, void *argp)
193{
194 struct cb_recallargs *args = argp;
195 __be32 *p;
196 __be32 status;
197
198 status = decode_delegation_stateid(xdr, &args->stateid);
199 if (unlikely(status != 0))
200 return status;
201 p = xdr_inline_decode(xdr, 4);
202 if (unlikely(p == NULL))
203 return htonl(NFS4ERR_RESOURCE);
204 args->truncate = ntohl(*p);
205 return decode_fh(xdr, &args->fh);
206}
207
208#if defined(CONFIG_NFS_V4_1)
209static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
210{
211 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
212 return decode_stateid(xdr, stateid);
213}
214
215static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
216 struct xdr_stream *xdr, void *argp)
217{
218 struct cb_layoutrecallargs *args = argp;
219 __be32 *p;
220 __be32 status = 0;
221 uint32_t iomode;
222
223 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
224 if (unlikely(p == NULL))
225 return htonl(NFS4ERR_BADXDR);
226
227 args->cbl_layout_type = ntohl(*p++);
228 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
229 * as it is unusable and ignored with the other types.
230 */
231 iomode = ntohl(*p++);
232 args->cbl_layoutchanged = ntohl(*p++);
233 args->cbl_recall_type = ntohl(*p++);
234
235 if (args->cbl_recall_type == RETURN_FILE) {
236 args->cbl_range.iomode = iomode;
237 status = decode_fh(xdr, &args->cbl_fh);
238 if (unlikely(status != 0))
239 return status;
240
241 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
242 if (unlikely(p == NULL))
243 return htonl(NFS4ERR_BADXDR);
244 p = xdr_decode_hyper(p, &args->cbl_range.offset);
245 p = xdr_decode_hyper(p, &args->cbl_range.length);
246 return decode_layout_stateid(xdr, &args->cbl_stateid);
247 } else if (args->cbl_recall_type == RETURN_FSID) {
248 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
249 if (unlikely(p == NULL))
250 return htonl(NFS4ERR_BADXDR);
251 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
252 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
253 } else if (args->cbl_recall_type != RETURN_ALL)
254 return htonl(NFS4ERR_BADXDR);
255 return 0;
256}
257
258static
259__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
260 struct xdr_stream *xdr,
261 void *argp)
262{
263 struct cb_devicenotifyargs *args = argp;
264 uint32_t tmp, n, i;
265 __be32 *p;
266 __be32 status = 0;
267
268 /* Num of device notifications */
269 p = xdr_inline_decode(xdr, sizeof(uint32_t));
270 if (unlikely(p == NULL)) {
271 status = htonl(NFS4ERR_BADXDR);
272 goto out;
273 }
274 n = ntohl(*p++);
275 if (n == 0)
276 goto out;
277
278 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
279 if (!args->devs) {
280 status = htonl(NFS4ERR_DELAY);
281 goto out;
282 }
283
284 /* Decode each dev notification */
285 for (i = 0; i < n; i++) {
286 struct cb_devicenotifyitem *dev = &args->devs[i];
287
288 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
289 NFS4_DEVICEID4_SIZE);
290 if (unlikely(p == NULL)) {
291 status = htonl(NFS4ERR_BADXDR);
292 goto err;
293 }
294
295 tmp = ntohl(*p++); /* bitmap size */
296 if (tmp != 1) {
297 status = htonl(NFS4ERR_INVAL);
298 goto err;
299 }
300 dev->cbd_notify_type = ntohl(*p++);
301 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
302 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
303 status = htonl(NFS4ERR_INVAL);
304 goto err;
305 }
306
307 tmp = ntohl(*p++); /* opaque size */
308 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
309 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
310 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
311 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
312 status = htonl(NFS4ERR_INVAL);
313 goto err;
314 }
315 dev->cbd_layout_type = ntohl(*p++);
316 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
317 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
318
319 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
320 p = xdr_inline_decode(xdr, sizeof(uint32_t));
321 if (unlikely(p == NULL)) {
322 status = htonl(NFS4ERR_BADXDR);
323 goto err;
324 }
325 dev->cbd_immediate = ntohl(*p++);
326 } else {
327 dev->cbd_immediate = 0;
328 }
329
330 dprintk("%s: type %d layout 0x%x immediate %d\n",
331 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
332 dev->cbd_immediate);
333 }
334 args->ndevs = n;
335 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
336 return 0;
337err:
338 kfree(args->devs);
339out:
340 args->devs = NULL;
341 args->ndevs = 0;
342 dprintk("%s: status %d ndevs %d\n",
343 __func__, ntohl(status), args->ndevs);
344 return status;
345}
346
347static __be32 decode_sessionid(struct xdr_stream *xdr,
348 struct nfs4_sessionid *sid)
349{
350 __be32 *p;
351
352 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
353 if (unlikely(p == NULL))
354 return htonl(NFS4ERR_RESOURCE);
355
356 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
357 return 0;
358}
359
360static __be32 decode_rc_list(struct xdr_stream *xdr,
361 struct referring_call_list *rc_list)
362{
363 __be32 *p;
364 int i;
365 __be32 status;
366
367 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
368 if (status)
369 goto out;
370
371 status = htonl(NFS4ERR_RESOURCE);
372 p = xdr_inline_decode(xdr, sizeof(uint32_t));
373 if (unlikely(p == NULL))
374 goto out;
375
376 rc_list->rcl_nrefcalls = ntohl(*p++);
377 if (rc_list->rcl_nrefcalls) {
378 if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len))
379 goto out;
380 p = xdr_inline_decode(xdr,
381 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
382 if (unlikely(p == NULL))
383 goto out;
384 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
385 sizeof(*rc_list->rcl_refcalls),
386 GFP_KERNEL);
387 if (unlikely(rc_list->rcl_refcalls == NULL))
388 goto out;
389 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
390 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
391 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
392 }
393 }
394 status = 0;
395
396out:
397 return status;
398}
399
400static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
401 struct xdr_stream *xdr,
402 void *argp)
403{
404 struct cb_sequenceargs *args = argp;
405 __be32 *p;
406 int i;
407 __be32 status;
408
409 status = decode_sessionid(xdr, &args->csa_sessionid);
410 if (status)
411 return status;
412
413 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
414 if (unlikely(p == NULL))
415 return htonl(NFS4ERR_RESOURCE);
416
417 args->csa_addr = svc_addr(rqstp);
418 args->csa_sequenceid = ntohl(*p++);
419 args->csa_slotid = ntohl(*p++);
420 args->csa_highestslotid = ntohl(*p++);
421 args->csa_cachethis = ntohl(*p++);
422 args->csa_nrclists = ntohl(*p++);
423 args->csa_rclists = NULL;
424 if (args->csa_nrclists) {
425 args->csa_rclists = kmalloc_array(args->csa_nrclists,
426 sizeof(*args->csa_rclists),
427 GFP_KERNEL);
428 if (unlikely(args->csa_rclists == NULL))
429 return htonl(NFS4ERR_RESOURCE);
430
431 for (i = 0; i < args->csa_nrclists; i++) {
432 status = decode_rc_list(xdr, &args->csa_rclists[i]);
433 if (status) {
434 args->csa_nrclists = i;
435 goto out_free;
436 }
437 }
438 }
439 return 0;
440
441out_free:
442 for (i = 0; i < args->csa_nrclists; i++)
443 kfree(args->csa_rclists[i].rcl_refcalls);
444 kfree(args->csa_rclists);
445 return status;
446}
447
448static __be32 decode_recallany_args(struct svc_rqst *rqstp,
449 struct xdr_stream *xdr,
450 void *argp)
451{
452 struct cb_recallanyargs *args = argp;
453 uint32_t bitmap[3];
454 __be32 *p, status;
455
456 p = xdr_inline_decode(xdr, 4);
457 if (unlikely(p == NULL))
458 return htonl(NFS4ERR_BADXDR);
459 args->craa_objs_to_keep = ntohl(*p++);
460 status = decode_bitmap(xdr, bitmap);
461 if (unlikely(status))
462 return status;
463 args->craa_type_mask = bitmap[0];
464
465 return 0;
466}
467
468static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
469 struct xdr_stream *xdr,
470 void *argp)
471{
472 struct cb_recallslotargs *args = argp;
473 __be32 *p;
474
475 p = xdr_inline_decode(xdr, 4);
476 if (unlikely(p == NULL))
477 return htonl(NFS4ERR_BADXDR);
478 args->crsa_target_highest_slotid = ntohl(*p++);
479 return 0;
480}
481
482static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
483{
484 __be32 *p;
485 unsigned int len;
486
487 p = xdr_inline_decode(xdr, 12);
488 if (unlikely(p == NULL))
489 return htonl(NFS4ERR_BADXDR);
490
491 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
492 len = be32_to_cpu(*p);
493
494 p = xdr_inline_decode(xdr, len);
495 if (unlikely(p == NULL))
496 return htonl(NFS4ERR_BADXDR);
497
498 /* Only try to decode if the length is right */
499 if (len == 20) {
500 p += 2; /* skip "lock id:" */
501 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
502 xdr_decode_hyper(p, &args->cbnl_owner.id);
503 args->cbnl_valid = true;
504 } else {
505 args->cbnl_owner.s_dev = 0;
506 args->cbnl_owner.id = 0;
507 args->cbnl_valid = false;
508 }
509 return 0;
510}
511
512static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
513 struct xdr_stream *xdr, void *argp)
514{
515 struct cb_notify_lock_args *args = argp;
516 __be32 status;
517
518 status = decode_fh(xdr, &args->cbnl_fh);
519 if (unlikely(status != 0))
520 return status;
521 return decode_lockowner(xdr, args);
522}
523
524#endif /* CONFIG_NFS_V4_1 */
525#ifdef CONFIG_NFS_V4_2
526static __be32 decode_write_response(struct xdr_stream *xdr,
527 struct cb_offloadargs *args)
528{
529 __be32 *p;
530
531 /* skip the always zero field */
532 p = xdr_inline_decode(xdr, 4);
533 if (unlikely(!p))
534 goto out;
535 p++;
536
537 /* decode count, stable_how, verifier */
538 p = xdr_inline_decode(xdr, 8 + 4);
539 if (unlikely(!p))
540 goto out;
541 p = xdr_decode_hyper(p, &args->wr_count);
542 args->wr_writeverf.committed = be32_to_cpup(p);
543 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
544 if (likely(p)) {
545 memcpy(&args->wr_writeverf.verifier.data[0], p,
546 NFS4_VERIFIER_SIZE);
547 return 0;
548 }
549out:
550 return htonl(NFS4ERR_RESOURCE);
551}
552
553static __be32 decode_offload_args(struct svc_rqst *rqstp,
554 struct xdr_stream *xdr,
555 void *data)
556{
557 struct cb_offloadargs *args = data;
558 __be32 *p;
559 __be32 status;
560
561 /* decode fh */
562 status = decode_fh(xdr, &args->coa_fh);
563 if (unlikely(status != 0))
564 return status;
565
566 /* decode stateid */
567 status = decode_stateid(xdr, &args->coa_stateid);
568 if (unlikely(status != 0))
569 return status;
570
571 /* decode status */
572 p = xdr_inline_decode(xdr, 4);
573 if (unlikely(!p))
574 goto out;
575 args->error = ntohl(*p++);
576 if (!args->error) {
577 status = decode_write_response(xdr, args);
578 if (unlikely(status != 0))
579 return status;
580 } else {
581 p = xdr_inline_decode(xdr, 8);
582 if (unlikely(!p))
583 goto out;
584 p = xdr_decode_hyper(p, &args->wr_count);
585 }
586 return 0;
587out:
588 return htonl(NFS4ERR_RESOURCE);
589}
590#endif /* CONFIG_NFS_V4_2 */
591static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
592{
593 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
594 return cpu_to_be32(NFS4ERR_RESOURCE);
595 return 0;
596}
597
598static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
599{
600 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
601 return cpu_to_be32(NFS4ERR_RESOURCE);
602 return 0;
603}
604
605static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
606{
607 __be32 *p;
608
609 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
610 return 0;
611 p = xdr_reserve_space(xdr, 8);
612 if (unlikely(!p))
613 return htonl(NFS4ERR_RESOURCE);
614 p = xdr_encode_hyper(p, change);
615 return 0;
616}
617
618static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
619{
620 __be32 *p;
621
622 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
623 return 0;
624 p = xdr_reserve_space(xdr, 8);
625 if (unlikely(!p))
626 return htonl(NFS4ERR_RESOURCE);
627 p = xdr_encode_hyper(p, size);
628 return 0;
629}
630
631static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
632{
633 __be32 *p;
634
635 p = xdr_reserve_space(xdr, 12);
636 if (unlikely(!p))
637 return htonl(NFS4ERR_RESOURCE);
638 p = xdr_encode_hyper(p, time->tv_sec);
639 *p = htonl(time->tv_nsec);
640 return 0;
641}
642
643static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
644{
645 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS))
646 return 0;
647 return encode_attr_time(xdr,time);
648}
649
650static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
651{
652 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
653 return 0;
654 return encode_attr_time(xdr,time);
655}
656
657static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
658{
659 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
660 return 0;
661 return encode_attr_time(xdr,time);
662}
663
664static __be32 encode_attr_delegatime(struct xdr_stream *xdr,
665 const uint32_t *bitmap,
666 const struct timespec64 *time)
667{
668 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS))
669 return 0;
670 return encode_attr_time(xdr,time);
671}
672
673static __be32 encode_attr_delegmtime(struct xdr_stream *xdr,
674 const uint32_t *bitmap,
675 const struct timespec64 *time)
676{
677 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY))
678 return 0;
679 return encode_attr_time(xdr,time);
680}
681
682static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
683{
684 __be32 status;
685
686 hdr->status = xdr_reserve_space(xdr, 4);
687 if (unlikely(hdr->status == NULL))
688 return htonl(NFS4ERR_RESOURCE);
689 status = encode_string(xdr, hdr->taglen, hdr->tag);
690 if (unlikely(status != 0))
691 return status;
692 hdr->nops = xdr_reserve_space(xdr, 4);
693 if (unlikely(hdr->nops == NULL))
694 return htonl(NFS4ERR_RESOURCE);
695 return 0;
696}
697
698static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
699{
700 __be32 *p;
701
702 p = xdr_reserve_space(xdr, 8);
703 if (unlikely(p == NULL))
704 return htonl(NFS4ERR_RESOURCE_HDR);
705 *p++ = htonl(op);
706 *p = res;
707 return 0;
708}
709
710static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
711 const void *resp)
712{
713 const struct cb_getattrres *res = resp;
714 __be32 *savep = NULL;
715 __be32 status = res->status;
716
717 if (unlikely(status != 0))
718 goto out;
719 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
720 if (unlikely(status != 0))
721 goto out;
722 status = cpu_to_be32(NFS4ERR_RESOURCE);
723 savep = xdr_reserve_space(xdr, sizeof(*savep));
724 if (unlikely(!savep))
725 goto out;
726 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
727 if (unlikely(status != 0))
728 goto out;
729 status = encode_attr_size(xdr, res->bitmap, res->size);
730 if (unlikely(status != 0))
731 goto out;
732 status = encode_attr_atime(xdr, res->bitmap, &res->atime);
733 if (unlikely(status != 0))
734 goto out;
735 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
736 if (unlikely(status != 0))
737 goto out;
738 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
739 if (unlikely(status != 0))
740 goto out;
741 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime);
742 if (unlikely(status != 0))
743 goto out;
744 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime);
745 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
746out:
747 return status;
748}
749
750#if defined(CONFIG_NFS_V4_1)
751
752static __be32 encode_sessionid(struct xdr_stream *xdr,
753 const struct nfs4_sessionid *sid)
754{
755 __be32 *p;
756
757 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
758 if (unlikely(p == NULL))
759 return htonl(NFS4ERR_RESOURCE);
760
761 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
762 return 0;
763}
764
765static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
766 struct xdr_stream *xdr,
767 const void *resp)
768{
769 const struct cb_sequenceres *res = resp;
770 __be32 *p;
771 __be32 status = res->csr_status;
772
773 if (unlikely(status != 0))
774 return status;
775
776 status = encode_sessionid(xdr, &res->csr_sessionid);
777 if (status)
778 return status;
779
780 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
781 if (unlikely(p == NULL))
782 return htonl(NFS4ERR_RESOURCE);
783
784 *p++ = htonl(res->csr_sequenceid);
785 *p++ = htonl(res->csr_slotid);
786 *p++ = htonl(res->csr_highestslotid);
787 *p++ = htonl(res->csr_target_highestslotid);
788 return 0;
789}
790
791static __be32
792preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
793{
794 if (op_nr == OP_CB_SEQUENCE) {
795 if (nop != 0)
796 return htonl(NFS4ERR_SEQUENCE_POS);
797 } else {
798 if (nop == 0)
799 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
800 }
801
802 switch (op_nr) {
803 case OP_CB_GETATTR:
804 case OP_CB_RECALL:
805 case OP_CB_SEQUENCE:
806 case OP_CB_RECALL_ANY:
807 case OP_CB_RECALL_SLOT:
808 case OP_CB_LAYOUTRECALL:
809 case OP_CB_NOTIFY_DEVICEID:
810 case OP_CB_NOTIFY_LOCK:
811 *op = &callback_ops[op_nr];
812 break;
813
814 case OP_CB_NOTIFY:
815 case OP_CB_PUSH_DELEG:
816 case OP_CB_RECALLABLE_OBJ_AVAIL:
817 case OP_CB_WANTS_CANCELLED:
818 return htonl(NFS4ERR_NOTSUPP);
819
820 default:
821 return htonl(NFS4ERR_OP_ILLEGAL);
822 }
823
824 return htonl(NFS_OK);
825}
826
827static void nfs4_callback_free_slot(struct nfs4_session *session,
828 struct nfs4_slot *slot)
829{
830 struct nfs4_slot_table *tbl = &session->bc_slot_table;
831
832 spin_lock(&tbl->slot_tbl_lock);
833 /*
834 * Let the state manager know callback processing done.
835 * A single slot, so highest used slotid is either 0 or -1
836 */
837 nfs4_free_slot(tbl, slot);
838 spin_unlock(&tbl->slot_tbl_lock);
839}
840
841static void nfs4_cb_free_slot(struct cb_process_state *cps)
842{
843 if (cps->slot) {
844 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
845 cps->slot = NULL;
846 }
847}
848
849#else /* CONFIG_NFS_V4_1 */
850
851static __be32
852preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
853{
854 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
855}
856
857static void nfs4_cb_free_slot(struct cb_process_state *cps)
858{
859}
860#endif /* CONFIG_NFS_V4_1 */
861
862#ifdef CONFIG_NFS_V4_2
863static __be32
864preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
865{
866 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
867 if (status != htonl(NFS4ERR_OP_ILLEGAL))
868 return status;
869
870 if (op_nr == OP_CB_OFFLOAD) {
871 *op = &callback_ops[op_nr];
872 return htonl(NFS_OK);
873 } else
874 return htonl(NFS4ERR_NOTSUPP);
875 return htonl(NFS4ERR_OP_ILLEGAL);
876}
877#else /* CONFIG_NFS_V4_2 */
878static __be32
879preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
880{
881 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
882}
883#endif /* CONFIG_NFS_V4_2 */
884
885static __be32
886preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
887{
888 switch (op_nr) {
889 case OP_CB_GETATTR:
890 case OP_CB_RECALL:
891 *op = &callback_ops[op_nr];
892 break;
893 default:
894 return htonl(NFS4ERR_OP_ILLEGAL);
895 }
896
897 return htonl(NFS_OK);
898}
899
900static __be32 process_op(int nop, struct svc_rqst *rqstp,
901 struct cb_process_state *cps)
902{
903 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
904 struct callback_op *op = &callback_ops[0];
905 unsigned int op_nr;
906 __be32 status;
907 long maxlen;
908 __be32 res;
909
910 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
911 if (unlikely(status))
912 return status;
913
914 switch (cps->minorversion) {
915 case 0:
916 status = preprocess_nfs4_op(op_nr, &op);
917 break;
918 case 1:
919 status = preprocess_nfs41_op(nop, op_nr, &op);
920 break;
921 case 2:
922 status = preprocess_nfs42_op(nop, op_nr, &op);
923 break;
924 default:
925 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
926 }
927
928 if (status == htonl(NFS4ERR_OP_ILLEGAL))
929 op_nr = OP_CB_ILLEGAL;
930 if (status)
931 goto encode_hdr;
932
933 if (cps->drc_status) {
934 status = cps->drc_status;
935 goto encode_hdr;
936 }
937
938 maxlen = xdr_out->end - xdr_out->p;
939 if (maxlen > 0 && maxlen < PAGE_SIZE) {
940 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
941 rqstp->rq_argp);
942 if (likely(status == 0))
943 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
944 cps);
945 } else
946 status = htonl(NFS4ERR_RESOURCE);
947
948encode_hdr:
949 res = encode_op_hdr(xdr_out, op_nr, status);
950 if (unlikely(res))
951 return res;
952 if (op->encode_res != NULL && status == 0)
953 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
954 return status;
955}
956
957/*
958 * Decode, process and encode a COMPOUND
959 */
960static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
961{
962 struct cb_compound_hdr_arg hdr_arg = { 0 };
963 struct cb_compound_hdr_res hdr_res = { NULL };
964 struct cb_process_state cps = {
965 .drc_status = 0,
966 .clp = NULL,
967 .net = SVC_NET(rqstp),
968 };
969 unsigned int nops = 0;
970 __be32 status;
971
972 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
973 if (status == htonl(NFS4ERR_RESOURCE))
974 return rpc_garbage_args;
975
976 if (hdr_arg.minorversion == 0) {
977 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
978 if (!cps.clp) {
979 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
980 goto out_invalidcred;
981 }
982 if (!check_gss_callback_principal(cps.clp, rqstp)) {
983 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
984 nfs_put_client(cps.clp);
985 goto out_invalidcred;
986 }
987 }
988
989 cps.minorversion = hdr_arg.minorversion;
990 hdr_res.taglen = hdr_arg.taglen;
991 hdr_res.tag = hdr_arg.tag;
992 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
993 if (cps.clp)
994 nfs_put_client(cps.clp);
995 return rpc_system_err;
996 }
997 while (status == 0 && nops != hdr_arg.nops) {
998 status = process_op(nops, rqstp, &cps);
999 nops++;
1000 }
1001
1002 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
1003 * resource error in cb_compound status without returning op */
1004 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
1005 status = htonl(NFS4ERR_RESOURCE);
1006 nops--;
1007 }
1008
1009 if (svc_is_backchannel(rqstp) && cps.clp) {
1010 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval;
1011 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries;
1012 }
1013
1014 *hdr_res.status = status;
1015 *hdr_res.nops = htonl(nops);
1016 nfs4_cb_free_slot(&cps);
1017 nfs_put_client(cps.clp);
1018 return rpc_success;
1019
1020out_invalidcred:
1021 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1022 rqstp->rq_auth_stat = rpc_autherr_badcred;
1023 return rpc_success;
1024}
1025
1026static int
1027nfs_callback_dispatch(struct svc_rqst *rqstp)
1028{
1029 const struct svc_procedure *procp = rqstp->rq_procinfo;
1030
1031 *rqstp->rq_accept_statp = procp->pc_func(rqstp);
1032 return 1;
1033}
1034
1035/*
1036 * Define NFS4 callback COMPOUND ops.
1037 */
1038static struct callback_op callback_ops[] = {
1039 [0] = {
1040 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1041 },
1042 [OP_CB_GETATTR] = {
1043 .process_op = nfs4_callback_getattr,
1044 .decode_args = decode_getattr_args,
1045 .encode_res = encode_getattr_res,
1046 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1047 },
1048 [OP_CB_RECALL] = {
1049 .process_op = nfs4_callback_recall,
1050 .decode_args = decode_recall_args,
1051 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1052 },
1053#if defined(CONFIG_NFS_V4_1)
1054 [OP_CB_LAYOUTRECALL] = {
1055 .process_op = nfs4_callback_layoutrecall,
1056 .decode_args = decode_layoutrecall_args,
1057 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1058 },
1059 [OP_CB_NOTIFY_DEVICEID] = {
1060 .process_op = nfs4_callback_devicenotify,
1061 .decode_args = decode_devicenotify_args,
1062 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1063 },
1064 [OP_CB_SEQUENCE] = {
1065 .process_op = nfs4_callback_sequence,
1066 .decode_args = decode_cb_sequence_args,
1067 .encode_res = encode_cb_sequence_res,
1068 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1069 },
1070 [OP_CB_RECALL_ANY] = {
1071 .process_op = nfs4_callback_recallany,
1072 .decode_args = decode_recallany_args,
1073 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1074 },
1075 [OP_CB_RECALL_SLOT] = {
1076 .process_op = nfs4_callback_recallslot,
1077 .decode_args = decode_recallslot_args,
1078 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1079 },
1080 [OP_CB_NOTIFY_LOCK] = {
1081 .process_op = nfs4_callback_notify_lock,
1082 .decode_args = decode_notify_lock_args,
1083 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1084 },
1085#endif /* CONFIG_NFS_V4_1 */
1086#ifdef CONFIG_NFS_V4_2
1087 [OP_CB_OFFLOAD] = {
1088 .process_op = nfs4_callback_offload,
1089 .decode_args = decode_offload_args,
1090 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1091 },
1092#endif /* CONFIG_NFS_V4_2 */
1093};
1094
1095/*
1096 * Define NFS4 callback procedures
1097 */
1098static const struct svc_procedure nfs4_callback_procedures1[] = {
1099 [CB_NULL] = {
1100 .pc_func = nfs4_callback_null,
1101 .pc_encode = nfs4_encode_void,
1102 .pc_xdrressize = 1,
1103 .pc_name = "NULL",
1104 },
1105 [CB_COMPOUND] = {
1106 .pc_func = nfs4_callback_compound,
1107 .pc_encode = nfs4_encode_void,
1108 .pc_argsize = 256,
1109 .pc_argzero = 256,
1110 .pc_ressize = 256,
1111 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1112 .pc_name = "COMPOUND",
1113 }
1114};
1115
1116static DEFINE_PER_CPU_ALIGNED(unsigned long,
1117 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]);
1118const struct svc_version nfs4_callback_version1 = {
1119 .vs_vers = 1,
1120 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1121 .vs_proc = nfs4_callback_procedures1,
1122 .vs_count = nfs4_callback_count1,
1123 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1124 .vs_dispatch = nfs_callback_dispatch,
1125 .vs_hidden = true,
1126 .vs_need_cong_ctrl = true,
1127};
1128
1129static DEFINE_PER_CPU_ALIGNED(unsigned long,
1130 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]);
1131const struct svc_version nfs4_callback_version4 = {
1132 .vs_vers = 4,
1133 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1134 .vs_proc = nfs4_callback_procedures1,
1135 .vs_count = nfs4_callback_count4,
1136 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1137 .vs_dispatch = nfs_callback_dispatch,
1138 .vs_hidden = true,
1139 .vs_need_cong_ctrl = true,
1140};