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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[linux-2.6-block.git] / fs / nfs / callback_xdr.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
1da177e4
LT		 8#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
9a3ba432
TM		 12#include <linux/ratelimit.h>
13#include <linux/printk.h>
5a0e3ad6 14#include <linux/slab.h>
c36fca52 15#include <linux/sunrpc/bc_xprt.h>
4ce79717 16#include "nfs4_fs.h"
1da177e4 17#include "callback.h"
c36fca52 18#include "internal.h"
76e697ba 19#include "nfs4session.h"
1da177e4 20
45724e8a
KM		 21#define CB_OP_TAGLEN_MAXSZ (512)
22#define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
23#define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
24#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 /* change, size, ctime, mtime */\
27 (2 + 2 + 3 + 3) * 4)
28#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
1da177e4 29
4aece6a1 30#if defined(CONFIG_NFS_V4_1)
f2a62561 31#define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
1be5683b 32#define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1 33#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
45724e8a
KM		 34 NFS4_MAX_SESSIONID_LEN + \
35 (1 + 3) * 4) // seqid, 3 slotids
31f09607 36#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
b9efa1b2 37#define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1
BH		 38#endif /* CONFIG_NFS_V4_1 */
39
1da177e4
LT		 40#define NFSDBG_FACILITY NFSDBG_CALLBACK
41
31d2b435
AA		 42/* Internal error code */
43#define NFS4ERR_RESOURCE_HDR 11050
44
c36fca52
AA		 45typedef __be32 (*callback_process_op_t)(void *, void *,
46 struct cb_process_state *);
e6f684f6
AV		 47typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
48typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
1da177e4
LT		 49
50
51struct callback_op {
52 callback_process_op_t process_op;
53 callback_decode_arg_t decode_args;
54 callback_encode_res_t encode_res;
55 long res_maxsize;
56};
57
58static struct callback_op callback_ops[];
59
7111c66e 60static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4
LT		 61{
62 return htonl(NFS4_OK);
63}
64
5704fdeb 65static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 66{
67 return xdr_argsize_check(rqstp, p);
68}
69
5704fdeb 70static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 71{
72 return xdr_ressize_check(rqstp, p);
73}
74
5704fdeb 75static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
1da177e4 76{
5704fdeb 77 __be32 *p;
1da177e4
LT		 78
79 p = xdr_inline_decode(xdr, nbytes);
80 if (unlikely(p == NULL))
756b9b37 81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
1da177e4
LT		 82 return p;
83}
84
e6f684f6 85static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
1da177e4 86{
5704fdeb 87 __be32 *p;
1da177e4
LT		 88
89 p = read_buf(xdr, 4);
90 if (unlikely(p == NULL))
91 return htonl(NFS4ERR_RESOURCE);
92 *len = ntohl(*p);
93
94 if (*len != 0) {
95 p = read_buf(xdr, *len);
96 if (unlikely(p == NULL))
97 return htonl(NFS4ERR_RESOURCE);
98 *str = (const char *)p;
99 } else
100 *str = NULL;
101
102 return 0;
103}
104
e6f684f6 105static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
1da177e4 106{
5704fdeb 107 __be32 *p;
1da177e4
LT		 108
109 p = read_buf(xdr, 4);
110 if (unlikely(p == NULL))
111 return htonl(NFS4ERR_RESOURCE);
112 fh->size = ntohl(*p);
113 if (fh->size > NFS4_FHSIZE)
114 return htonl(NFS4ERR_BADHANDLE);
115 p = read_buf(xdr, fh->size);
116 if (unlikely(p == NULL))
117 return htonl(NFS4ERR_RESOURCE);
118 memcpy(&fh->data[0], p, fh->size);
119 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
120 return 0;
121}
122
e6f684f6 123static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
1da177e4 124{
5704fdeb 125 __be32 *p;
1da177e4
LT		 126 unsigned int attrlen;
127
128 p = read_buf(xdr, 4);
129 if (unlikely(p == NULL))
130 return htonl(NFS4ERR_RESOURCE);
131 attrlen = ntohl(*p);
132 p = read_buf(xdr, attrlen << 2);
133 if (unlikely(p == NULL))
134 return htonl(NFS4ERR_RESOURCE);
135 if (likely(attrlen > 0))
136 bitmap[0] = ntohl(*p++);
137 if (attrlen > 1)
138 bitmap[1] = ntohl(*p);
139 return 0;
140}
141
e6f684f6 142static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
1da177e4 143{
5704fdeb 144 __be32 *p;
1da177e4 145
2d2f24ad 146 p = read_buf(xdr, NFS4_STATEID_SIZE);
1da177e4
LT		 147 if (unlikely(p == NULL))
148 return htonl(NFS4ERR_RESOURCE);
2d2f24ad 149 memcpy(stateid, p, NFS4_STATEID_SIZE);
1da177e4
LT		 150 return 0;
151}
152
e6f684f6 153static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
1da177e4 154{
5704fdeb 155 __be32 *p;
e6f684f6 156 __be32 status;
1da177e4
LT		 157
158 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
159 if (unlikely(status != 0))
160 return status;
161 /* We do not like overly long tags! */
403889c0 162 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
a030889a 163 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
3110ff80 164 __func__, hdr->taglen);
1da177e4
LT		 165 return htonl(NFS4ERR_RESOURCE);
166 }
167 p = read_buf(xdr, 12);
168 if (unlikely(p == NULL))
169 return htonl(NFS4ERR_RESOURCE);
b8f2ef84 170 hdr->minorversion = ntohl(*p++);
459de2ed
BS		 171 /* Check for minor version support */
172 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
42c2c424 173 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
48a9e2d2 174 } else {
9a3ba432 175 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
b8f2ef84
BH		 176 "illegal minor version %u!\n",
177 __func__, hdr->minorversion);
1da177e4
LT		 178 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
179 }
1da177e4 180 hdr->nops = ntohl(*p);
b8f2ef84
BH		 181 dprintk("%s: minorversion %d nops %d\n", __func__,
182 hdr->minorversion, hdr->nops);
1da177e4
LT		 183 return 0;
184}
185
e6f684f6 186static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
1da177e4 187{
5704fdeb 188 __be32 *p;
1da177e4
LT		 189 p = read_buf(xdr, 4);
190 if (unlikely(p == NULL))
31d2b435 191 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 192 *op = ntohl(*p);
193 return 0;
194}
195
e6f684f6 196static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
1da177e4 197{
e6f684f6 198 __be32 status;
1da177e4
LT		 199
200 status = decode_fh(xdr, &args->fh);
201 if (unlikely(status != 0))
202 goto out;
1da177e4
LT		 203 status = decode_bitmap(xdr, args->bitmap);
204out:
3110ff80 205 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 206 return status;
207}
208
e6f684f6 209static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
1da177e4 210{
5704fdeb 211 __be32 *p;
e6f684f6 212 __be32 status;
1da177e4 213
1da177e4
LT		 214 status = decode_stateid(xdr, &args->stateid);
215 if (unlikely(status != 0))
216 goto out;
217 p = read_buf(xdr, 4);
218 if (unlikely(p == NULL)) {
219 status = htonl(NFS4ERR_RESOURCE);
220 goto out;
221 }
222 args->truncate = ntohl(*p);
223 status = decode_fh(xdr, &args->fh);
224out:
3110ff80 225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
3873bc50 226 return status;
1da177e4
LT		 227}
228
4aece6a1
BH		 229#if defined(CONFIG_NFS_V4_1)
230
f2a62561
FI		 231static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
232 struct xdr_stream *xdr,
233 struct cb_layoutrecallargs *args)
234{
235 __be32 *p;
236 __be32 status = 0;
237 uint32_t iomode;
238
f2a62561
FI		 239 p = read_buf(xdr, 4 * sizeof(uint32_t));
240 if (unlikely(p == NULL)) {
241 status = htonl(NFS4ERR_BADXDR);
242 goto out;
243 }
244
245 args->cbl_layout_type = ntohl(*p++);
246 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
25985edc 247 * as it is unusable and ignored with the other types.
f2a62561
FI		 248 */
249 iomode = ntohl(*p++);
250 args->cbl_layoutchanged = ntohl(*p++);
251 args->cbl_recall_type = ntohl(*p++);
252
253 if (args->cbl_recall_type == RETURN_FILE) {
254 args->cbl_range.iomode = iomode;
255 status = decode_fh(xdr, &args->cbl_fh);
256 if (unlikely(status != 0))
257 goto out;
258
259 p = read_buf(xdr, 2 * sizeof(uint64_t));
260 if (unlikely(p == NULL)) {
261 status = htonl(NFS4ERR_BADXDR);
262 goto out;
263 }
264 p = xdr_decode_hyper(p, &args->cbl_range.offset);
265 p = xdr_decode_hyper(p, &args->cbl_range.length);
266 status = decode_stateid(xdr, &args->cbl_stateid);
267 if (unlikely(status != 0))
268 goto out;
269 } else if (args->cbl_recall_type == RETURN_FSID) {
270 p = read_buf(xdr, 2 * sizeof(uint64_t));
271 if (unlikely(p == NULL)) {
272 status = htonl(NFS4ERR_BADXDR);
273 goto out;
274 }
275 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
276 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
277 } else if (args->cbl_recall_type != RETURN_ALL) {
278 status = htonl(NFS4ERR_BADXDR);
279 goto out;
280 }
281 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
282 __func__,
283 args->cbl_layout_type, iomode,
284 args->cbl_layoutchanged, args->cbl_recall_type);
285out:
286 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
287 return status;
288}
289
1be5683b
ME		 290static
291__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
292 struct xdr_stream *xdr,
293 struct cb_devicenotifyargs *args)
294{
295 __be32 *p;
296 __be32 status = 0;
297 u32 tmp;
298 int n, i;
299 args->ndevs = 0;
300
301 /* Num of device notifications */
302 p = read_buf(xdr, sizeof(uint32_t));
303 if (unlikely(p == NULL)) {
304 status = htonl(NFS4ERR_BADXDR);
305 goto out;
306 }
307 n = ntohl(*p++);
308 if (n <= 0)
309 goto out;
363e0df0
DC		 310 if (n > ULONG_MAX / sizeof(*args->devs)) {
311 status = htonl(NFS4ERR_BADXDR);
312 goto out;
313 }
1be5683b 314
a4f743a6 315 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
1be5683b
ME		 316 if (!args->devs) {
317 status = htonl(NFS4ERR_DELAY);
318 goto out;
319 }
320
321 /* Decode each dev notification */
322 for (i = 0; i < n; i++) {
323 struct cb_devicenotifyitem *dev = &args->devs[i];
324
325 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
326 if (unlikely(p == NULL)) {
327 status = htonl(NFS4ERR_BADXDR);
328 goto err;
329 }
330
331 tmp = ntohl(*p++); /* bitmap size */
332 if (tmp != 1) {
333 status = htonl(NFS4ERR_INVAL);
334 goto err;
335 }
336 dev->cbd_notify_type = ntohl(*p++);
337 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
338 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
339 status = htonl(NFS4ERR_INVAL);
340 goto err;
341 }
342
343 tmp = ntohl(*p++); /* opaque size */
344 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
345 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
346 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
347 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
348 status = htonl(NFS4ERR_INVAL);
349 goto err;
350 }
351 dev->cbd_layout_type = ntohl(*p++);
352 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
353 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
354
355 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
356 p = read_buf(xdr, sizeof(uint32_t));
357 if (unlikely(p == NULL)) {
358 status = htonl(NFS4ERR_BADXDR);
359 goto err;
360 }
361 dev->cbd_immediate = ntohl(*p++);
362 } else {
363 dev->cbd_immediate = 0;
364 }
365
366 args->ndevs++;
367
368 dprintk("%s: type %d layout 0x%x immediate %d\n",
369 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
370 dev->cbd_immediate);
371 }
372out:
373 dprintk("%s: status %d ndevs %d\n",
374 __func__, ntohl(status), args->ndevs);
375 return status;
376err:
377 kfree(args->devs);
378 goto out;
379}
380
9733f0d9 381static __be32 decode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 382 struct nfs4_sessionid *sid)
383{
9733f0d9 384 __be32 *p;
4aece6a1 385
590184a6 386 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
4aece6a1 387 if (unlikely(p == NULL))
a419aef8 388 return htonl(NFS4ERR_RESOURCE);
4aece6a1 389
590184a6 390 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 391 return 0;
392}
393
9733f0d9 394static __be32 decode_rc_list(struct xdr_stream *xdr,
4aece6a1
BH		 395 struct referring_call_list *rc_list)
396{
9733f0d9 397 __be32 *p;
4aece6a1 398 int i;
9733f0d9 399 __be32 status;
4aece6a1
BH		 400
401 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
402 if (status)
403 goto out;
404
405 status = htonl(NFS4ERR_RESOURCE);
406 p = read_buf(xdr, sizeof(uint32_t));
407 if (unlikely(p == NULL))
408 goto out;
409
410 rc_list->rcl_nrefcalls = ntohl(*p++);
411 if (rc_list->rcl_nrefcalls) {
412 p = read_buf(xdr,
413 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
414 if (unlikely(p == NULL))
415 goto out;
a4f743a6 416 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
4aece6a1
BH		 417 sizeof(*rc_list->rcl_refcalls),
418 GFP_KERNEL);
419 if (unlikely(rc_list->rcl_refcalls == NULL))
420 goto out;
421 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
422 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
423 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
424 }
425 }
426 status = 0;
427
428out:
429 return status;
430}
431
9733f0d9 432static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
4aece6a1
BH		 433 struct xdr_stream *xdr,
434 struct cb_sequenceargs *args)
435{
9733f0d9 436 __be32 *p;
4aece6a1 437 int i;
9733f0d9 438 __be32 status;
4aece6a1
BH		 439
440 status = decode_sessionid(xdr, &args->csa_sessionid);
441 if (status)
442 goto out;
443
444 status = htonl(NFS4ERR_RESOURCE);
445 p = read_buf(xdr, 5 * sizeof(uint32_t));
446 if (unlikely(p == NULL))
447 goto out;
448
65fc64e5 449 args->csa_addr = svc_addr(rqstp);
4aece6a1
BH		 450 args->csa_sequenceid = ntohl(*p++);
451 args->csa_slotid = ntohl(*p++);
452 args->csa_highestslotid = ntohl(*p++);
453 args->csa_cachethis = ntohl(*p++);
454 args->csa_nrclists = ntohl(*p++);
455 args->csa_rclists = NULL;
456 if (args->csa_nrclists) {
0439f31c
DC		 457 args->csa_rclists = kmalloc_array(args->csa_nrclists,
458 sizeof(*args->csa_rclists),
459 GFP_KERNEL);
4aece6a1
BH		 460 if (unlikely(args->csa_rclists == NULL))
461 goto out;
462
463 for (i = 0; i < args->csa_nrclists; i++) {
464 status = decode_rc_list(xdr, &args->csa_rclists[i]);
d8ba1f97
TM		 465 if (status) {
466 args->csa_nrclists = i;
4aece6a1 467 goto out_free;
d8ba1f97 468 }
4aece6a1
BH		 469 }
470 }
471 status = 0;
472
473 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
474 "highestslotid %u cachethis %d nrclists %u\n",
475 __func__,
476 ((u32 *)&args->csa_sessionid)[0],
477 ((u32 *)&args->csa_sessionid)[1],
478 ((u32 *)&args->csa_sessionid)[2],
479 ((u32 *)&args->csa_sessionid)[3],
480 args->csa_sequenceid, args->csa_slotid,
481 args->csa_highestslotid, args->csa_cachethis,
482 args->csa_nrclists);
483out:
484 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
485 return status;
486
487out_free:
488 for (i = 0; i < args->csa_nrclists; i++)
489 kfree(args->csa_rclists[i].rcl_refcalls);
490 kfree(args->csa_rclists);
491 goto out;
492}
493
9733f0d9 494static __be32 decode_recallany_args(struct svc_rqst *rqstp,
31f09607
AB		 495 struct xdr_stream *xdr,
496 struct cb_recallanyargs *args)
497{
d743c3c9
PT		 498 uint32_t bitmap[2];
499 __be32 *p, status;
31f09607 500
31f09607
AB		 501 p = read_buf(xdr, 4);
502 if (unlikely(p == NULL))
503 return htonl(NFS4ERR_BADXDR);
504 args->craa_objs_to_keep = ntohl(*p++);
d743c3c9
PT		 505 status = decode_bitmap(xdr, bitmap);
506 if (unlikely(status))
507 return status;
508 args->craa_type_mask = bitmap[0];
31f09607
AB		 509
510 return 0;
511}
512
9733f0d9 513static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
b9efa1b2
AA		 514 struct xdr_stream *xdr,
515 struct cb_recallslotargs *args)
516{
517 __be32 *p;
518
b9efa1b2
AA		 519 p = read_buf(xdr, 4);
520 if (unlikely(p == NULL))
521 return htonl(NFS4ERR_BADXDR);
d5fb4ce3 522 args->crsa_target_highest_slotid = ntohl(*p++);
b9efa1b2
AA		 523 return 0;
524}
525
4aece6a1
BH		 526#endif /* CONFIG_NFS_V4_1 */
527
e6f684f6 528static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
1da177e4 529{
5704fdeb 530 __be32 *p;
1da177e4
LT		 531
532 p = xdr_reserve_space(xdr, 4 + len);
533 if (unlikely(p == NULL))
534 return htonl(NFS4ERR_RESOURCE);
535 xdr_encode_opaque(p, str, len);
536 return 0;
537}
538
539#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
540#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
5704fdeb 541static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
1da177e4 542{
5704fdeb
AV		 543 __be32 bm[2];
544 __be32 *p;
1da177e4
LT		 545
546 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
547 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
548 if (bm[1] != 0) {
549 p = xdr_reserve_space(xdr, 16);
550 if (unlikely(p == NULL))
551 return htonl(NFS4ERR_RESOURCE);
552 *p++ = htonl(2);
553 *p++ = bm[0];
554 *p++ = bm[1];
555 } else if (bm[0] != 0) {
556 p = xdr_reserve_space(xdr, 12);
557 if (unlikely(p == NULL))
558 return htonl(NFS4ERR_RESOURCE);
559 *p++ = htonl(1);
560 *p++ = bm[0];
561 } else {
562 p = xdr_reserve_space(xdr, 8);
563 if (unlikely(p == NULL))
564 return htonl(NFS4ERR_RESOURCE);
565 *p++ = htonl(0);
566 }
567 *savep = p;
568 return 0;
569}
570
e6f684f6 571static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
1da177e4 572{
5704fdeb 573 __be32 *p;
1da177e4
LT		 574
575 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
576 return 0;
577 p = xdr_reserve_space(xdr, 8);
90dc7d27 578 if (unlikely(!p))
1da177e4
LT		 579 return htonl(NFS4ERR_RESOURCE);
580 p = xdr_encode_hyper(p, change);
581 return 0;
582}
583
e6f684f6 584static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
1da177e4 585{
5704fdeb 586 __be32 *p;
1da177e4
LT		 587
588 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
589 return 0;
590 p = xdr_reserve_space(xdr, 8);
90dc7d27 591 if (unlikely(!p))
1da177e4
LT		 592 return htonl(NFS4ERR_RESOURCE);
593 p = xdr_encode_hyper(p, size);
594 return 0;
595}
596
e6f684f6 597static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
1da177e4 598{
5704fdeb 599 __be32 *p;
1da177e4
LT		 600
601 p = xdr_reserve_space(xdr, 12);
90dc7d27 602 if (unlikely(!p))
1da177e4
LT		 603 return htonl(NFS4ERR_RESOURCE);
604 p = xdr_encode_hyper(p, time->tv_sec);
605 *p = htonl(time->tv_nsec);
606 return 0;
607}
608
e6f684f6 609static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 610{
611 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
612 return 0;
613 return encode_attr_time(xdr,time);
614}
615
e6f684f6 616static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 617{
618 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
619 return 0;
620 return encode_attr_time(xdr,time);
621}
622
e6f684f6 623static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
1da177e4 624{
e6f684f6 625 __be32 status;
1da177e4
LT		 626
627 hdr->status = xdr_reserve_space(xdr, 4);
628 if (unlikely(hdr->status == NULL))
629 return htonl(NFS4ERR_RESOURCE);
630 status = encode_string(xdr, hdr->taglen, hdr->tag);
631 if (unlikely(status != 0))
632 return status;
633 hdr->nops = xdr_reserve_space(xdr, 4);
634 if (unlikely(hdr->nops == NULL))
635 return htonl(NFS4ERR_RESOURCE);
636 return 0;
637}
638
e6f684f6 639static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
1da177e4 640{
5704fdeb 641 __be32 *p;
1da177e4
LT		 642
643 p = xdr_reserve_space(xdr, 8);
644 if (unlikely(p == NULL))
31d2b435 645 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 646 *p++ = htonl(op);
647 *p = res;
648 return 0;
649}
650
e6f684f6 651static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
1da177e4 652{
5704fdeb 653 __be32 *savep = NULL;
e6f684f6 654 __be32 status = res->status;
1da177e4
LT		 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:
3110ff80 673 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 674 return status;
675}
676
34bc47c9
BH		 677#if defined(CONFIG_NFS_V4_1)
678
9733f0d9 679static __be32 encode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 680 const struct nfs4_sessionid *sid)
681{
9733f0d9 682 __be32 *p;
4aece6a1 683
590184a6 684 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 685 if (unlikely(p == NULL))
686 return htonl(NFS4ERR_RESOURCE);
687
590184a6 688 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 689 return 0;
690}
691
9733f0d9 692static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
4aece6a1
BH		 693 struct xdr_stream *xdr,
694 const struct cb_sequenceres *res)
695{
9733f0d9 696 __be32 *p;
e216c8c7 697 __be32 status = res->csr_status;
4aece6a1
BH		 698
699 if (unlikely(status != 0))
700 goto out;
701
e0a63c0b
KM		 702 status = encode_sessionid(xdr, &res->csr_sessionid);
703 if (status)
704 goto out;
4aece6a1
BH		 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);
714out:
715 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
716 return status;
717}
718
34bc47c9
BH		 719static __be32
720preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
721{
281fe15d
BH		 722 if (op_nr == OP_CB_SEQUENCE) {
723 if (nop != 0)
724 return htonl(NFS4ERR_SEQUENCE_POS);
725 } else {
726 if (nop == 0)
727 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
728 }
729
34bc47c9
BH		 730 switch (op_nr) {
731 case OP_CB_GETATTR:
732 case OP_CB_RECALL:
4aece6a1 733 case OP_CB_SEQUENCE:
31f09607 734 case OP_CB_RECALL_ANY:
b9efa1b2 735 case OP_CB_RECALL_SLOT:
f2a62561 736 case OP_CB_LAYOUTRECALL:
1be5683b 737 case OP_CB_NOTIFY_DEVICEID:
34bc47c9
BH		 738 *op = &callback_ops[op_nr];
739 break;
740
34bc47c9
BH		 741 case OP_CB_NOTIFY:
742 case OP_CB_PUSH_DELEG:
34bc47c9 743 case OP_CB_RECALLABLE_OBJ_AVAIL:
34bc47c9
BH		 744 case OP_CB_WANTS_CANCELLED:
745 case OP_CB_NOTIFY_LOCK:
746 return htonl(NFS4ERR_NOTSUPP);
747
748 default:
749 return htonl(NFS4ERR_OP_ILLEGAL);
750 }
751
752 return htonl(NFS_OK);
753}
754
810d82e6
TM		 755static void nfs4_callback_free_slot(struct nfs4_session *session,
756 struct nfs4_slot *slot)
42acd021
AA		 757{
758 struct nfs4_slot_table *tbl = &session->bc_slot_table;
759
760 spin_lock(&tbl->slot_tbl_lock);
761 /*
762 * Let the state manager know callback processing done.
763 * A single slot, so highest used slotid is either 0 or -1
764 */
810d82e6 765 nfs4_free_slot(tbl, slot);
774d5f14 766 nfs4_slot_tbl_drain_complete(tbl);
42acd021
AA		 767 spin_unlock(&tbl->slot_tbl_lock);
768}
769
55a67399 770static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021 771{
810d82e6
TM		 772 if (cps->slot) {
773 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
774 cps->slot = NULL;
775 }
42acd021
AA		 776}
777
34bc47c9
BH		 778#else /* CONFIG_NFS_V4_1 */
779
780static __be32
781preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
782{
783 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
784}
785
55a67399 786static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021
AA		 787{
788}
34bc47c9
BH		 789#endif /* CONFIG_NFS_V4_1 */
790
6b140b85
BS		 791#ifdef CONFIG_NFS_V4_2
792static __be32
793preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
794{
795 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
796 if (status != htonl(NFS4ERR_OP_ILLEGAL))
797 return status;
798
799 if (op_nr == OP_CB_OFFLOAD)
800 return htonl(NFS4ERR_NOTSUPP);
801 return htonl(NFS4ERR_OP_ILLEGAL);
802}
803#else /* CONFIG_NFS_V4_2 */
804static __be32
805preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
806{
807 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
808}
809#endif /* CONFIG_NFS_V4_2 */
810
34bc47c9
BH		 811static __be32
812preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
813{
814 switch (op_nr) {
815 case OP_CB_GETATTR:
816 case OP_CB_RECALL:
817 *op = &callback_ops[op_nr];
818 break;
819 default:
820 return htonl(NFS4ERR_OP_ILLEGAL);
821 }
822
823 return htonl(NFS_OK);
824}
825
459de2ed 826static __be32 process_op(int nop, struct svc_rqst *rqstp,
1da177e4 827 struct xdr_stream *xdr_in, void *argp,
c36fca52
AA		 828 struct xdr_stream *xdr_out, void *resp,
829 struct cb_process_state *cps)
1da177e4 830{
a162a6b8 831 struct callback_op *op = &callback_ops[0];
31d2b435 832 unsigned int op_nr;
34bc47c9 833 __be32 status;
1da177e4 834 long maxlen;
e6f684f6 835 __be32 res;
1da177e4 836
3110ff80 837 dprintk("%s: start\n", __func__);
1da177e4 838 status = decode_op_hdr(xdr_in, &op_nr);
31d2b435
AA		 839 if (unlikely(status))
840 return status;
1da177e4 841
34bc47c9 842 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
459de2ed 843 __func__, cps->minorversion, nop, op_nr);
34bc47c9 844
6b140b85
BS		 845 switch (cps->minorversion) {
846 case 0:
847 status = preprocess_nfs4_op(op_nr, &op);
848 break;
849 case 1:
850 status = preprocess_nfs41_op(nop, op_nr, &op);
851 break;
852 case 2:
853 status = preprocess_nfs42_op(nop, op_nr, &op);
854 break;
855 default:
856 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857 }
34bc47c9 858
34bc47c9
BH		 859 if (status == htonl(NFS4ERR_OP_ILLEGAL))
860 op_nr = OP_CB_ILLEGAL;
b92b3019
AA		 861 if (status)
862 goto encode_hdr;
31d2b435 863
c36fca52
AA		 864 if (cps->drc_status) {
865 status = cps->drc_status;
4911096f
AA		 866 goto encode_hdr;
867 }
868
1da177e4
LT		 869 maxlen = xdr_out->end - xdr_out->p;
870 if (maxlen > 0 && maxlen < PAGE_SIZE) {
e95e60da
AA		 871 status = op->decode_args(rqstp, xdr_in, argp);
872 if (likely(status == 0))
c36fca52 873 status = op->process_op(argp, resp, cps);
1da177e4
LT		 874 } else
875 status = htonl(NFS4ERR_RESOURCE);
876
b92b3019 877encode_hdr:
1da177e4 878 res = encode_op_hdr(xdr_out, op_nr, status);
31d2b435
AA		 879 if (unlikely(res))
880 return res;
1da177e4
LT		 881 if (op->encode_res != NULL && status == 0)
882 status = op->encode_res(rqstp, xdr_out, resp);
3110ff80 883 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
1da177e4
LT		 884 return status;
885}
886
887/*
888 * Decode, process and encode a COMPOUND
889 */
7111c66e 890static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4 891{
3a6258e1
TM		 892 struct cb_compound_hdr_arg hdr_arg = { 0 };
893 struct cb_compound_hdr_res hdr_res = { NULL };
1da177e4 894 struct xdr_stream xdr_in, xdr_out;
c36fca52
AA		 895 __be32 *p, status;
896 struct cb_process_state cps = {
897 .drc_status = 0,
898 .clp = NULL,
9695c705 899 .net = SVC_NET(rqstp),
c36fca52 900 };
3a6258e1 901 unsigned int nops = 0;
1da177e4 902
3110ff80 903 dprintk("%s: start\n", __func__);
1da177e4 904
756b9b37 905 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
1da177e4 906
5704fdeb 907 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
1da177e4
LT		 908 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
909
3a6258e1 910 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
4ed0d83d 911 if (status == htonl(NFS4ERR_RESOURCE))
3a6258e1
TM		 912 return rpc_garbage_args;
913
c36fca52 914 if (hdr_arg.minorversion == 0) {
9695c705 915 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
778be232 916 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
c36fca52 917 return rpc_drop_reply;
778be232 918 }
c36fca52 919
459de2ed 920 cps.minorversion = hdr_arg.minorversion;
1da177e4
LT		 921 hdr_res.taglen = hdr_arg.taglen;
922 hdr_res.tag = hdr_arg.tag;
3a6258e1
TM		 923 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
924 return rpc_system_err;
1da177e4 925
3a6258e1 926 while (status == 0 && nops != hdr_arg.nops) {
459de2ed
BS		 927 status = process_op(nops, rqstp, &xdr_in,
928 argp, &xdr_out, resp, &cps);
1da177e4
LT		 929 nops++;
930 }
3a6258e1 931
31d2b435
AA		 932 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
933 * resource error in cb_compound status without returning op */
934 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
935 status = htonl(NFS4ERR_RESOURCE);
936 nops--;
937 }
938
1da177e4
LT		 939 *hdr_res.status = status;
940 *hdr_res.nops = htonl(nops);
55a67399 941 nfs4_cb_free_slot(&cps);
c36fca52 942 nfs_put_client(cps.clp);
3110ff80 943 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
1da177e4
LT		 944 return rpc_success;
945}
946
947/*
948 * Define NFS4 callback COMPOUND ops.
949 */
950static struct callback_op callback_ops[] = {
951 [0] = {
952 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
953 },
954 [OP_CB_GETATTR] = {
955 .process_op = (callback_process_op_t)nfs4_callback_getattr,
956 .decode_args = (callback_decode_arg_t)decode_getattr_args,
957 .encode_res = (callback_encode_res_t)encode_getattr_res,
958 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
959 },
960 [OP_CB_RECALL] = {
961 .process_op = (callback_process_op_t)nfs4_callback_recall,
962 .decode_args = (callback_decode_arg_t)decode_recall_args,
963 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
4aece6a1
BH		 964 },
965#if defined(CONFIG_NFS_V4_1)
f2a62561
FI		 966 [OP_CB_LAYOUTRECALL] = {
967 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
968 .decode_args =
969 (callback_decode_arg_t)decode_layoutrecall_args,
970 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
971 },
1be5683b
ME		 972 [OP_CB_NOTIFY_DEVICEID] = {
973 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
974 .decode_args =
975 (callback_decode_arg_t)decode_devicenotify_args,
976 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
977 },
4aece6a1
BH		 978 [OP_CB_SEQUENCE] = {
979 .process_op = (callback_process_op_t)nfs4_callback_sequence,
980 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
981 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
982 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
983 },
31f09607
AB		 984 [OP_CB_RECALL_ANY] = {
985 .process_op = (callback_process_op_t)nfs4_callback_recallany,
986 .decode_args = (callback_decode_arg_t)decode_recallany_args,
987 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
988 },
b9efa1b2
AA		 989 [OP_CB_RECALL_SLOT] = {
990 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
991 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
992 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
993 },
4aece6a1 994#endif /* CONFIG_NFS_V4_1 */
1da177e4
LT		 995};
996
997/*
998 * Define NFS4 callback procedures
999 */
1000static struct svc_procedure nfs4_callback_procedures1[] = {
1001 [CB_NULL] = {
1002 .pc_func = nfs4_callback_null,
1003 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1004 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1005 .pc_xdrressize = 1,
1006 },
1007 [CB_COMPOUND] = {
1008 .pc_func = nfs4_callback_compound,
1009 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1010 .pc_argsize = 256,
1011 .pc_ressize = 256,
1012 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1013 }
1014};
1015
1016struct svc_version nfs4_callback_version1 = {
1017 .vs_vers = 1,
1018 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1019 .vs_proc = nfs4_callback_procedures1,
1020 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1021 .vs_dispatch = NULL,
49697ee7 1022 .vs_hidden = 1,
1da177e4
LT		 1023};
1024
07bccc2d
AB		 1025struct svc_version nfs4_callback_version4 = {
1026 .vs_vers = 4,
1027 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1028 .vs_proc = nfs4_callback_procedures1,
1029 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1030 .vs_dispatch = NULL,
6070295e 1031 .vs_hidden = 1,
07bccc2d 1032};
Linux 6.x block layer and io_uring tree(s)