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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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);
93b717fd 149 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
1da177e4
LT		 150 return 0;
151}
152
93b717fd
TM		 153static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
154{
155 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
156 return decode_stateid(xdr, stateid);
157}
158
e6f684f6 159static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
1da177e4 160{
5704fdeb 161 __be32 *p;
e6f684f6 162 __be32 status;
1da177e4
LT		 163
164 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
165 if (unlikely(status != 0))
166 return status;
167 /* We do not like overly long tags! */
403889c0 168 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
a030889a 169 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
3110ff80 170 __func__, hdr->taglen);
1da177e4
LT		 171 return htonl(NFS4ERR_RESOURCE);
172 }
173 p = read_buf(xdr, 12);
174 if (unlikely(p == NULL))
175 return htonl(NFS4ERR_RESOURCE);
b8f2ef84 176 hdr->minorversion = ntohl(*p++);
459de2ed
BS		 177 /* Check for minor version support */
178 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
42c2c424 179 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
48a9e2d2 180 } else {
9a3ba432 181 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
b8f2ef84
BH		 182 "illegal minor version %u!\n",
183 __func__, hdr->minorversion);
1da177e4
LT		 184 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
185 }
1da177e4 186 hdr->nops = ntohl(*p);
b8f2ef84
BH		 187 dprintk("%s: minorversion %d nops %d\n", __func__,
188 hdr->minorversion, hdr->nops);
1da177e4
LT		 189 return 0;
190}
191
e6f684f6 192static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
1da177e4 193{
5704fdeb 194 __be32 *p;
1da177e4
LT		 195 p = read_buf(xdr, 4);
196 if (unlikely(p == NULL))
31d2b435 197 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 198 *op = ntohl(*p);
199 return 0;
200}
201
e6f684f6 202static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
1da177e4 203{
e6f684f6 204 __be32 status;
1da177e4
LT		 205
206 status = decode_fh(xdr, &args->fh);
207 if (unlikely(status != 0))
208 goto out;
1da177e4
LT		 209 status = decode_bitmap(xdr, args->bitmap);
210out:
3110ff80 211 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 212 return status;
213}
214
e6f684f6 215static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
1da177e4 216{
5704fdeb 217 __be32 *p;
e6f684f6 218 __be32 status;
1da177e4 219
93b717fd 220 status = decode_delegation_stateid(xdr, &args->stateid);
1da177e4
LT		 221 if (unlikely(status != 0))
222 goto out;
223 p = read_buf(xdr, 4);
224 if (unlikely(p == NULL)) {
225 status = htonl(NFS4ERR_RESOURCE);
226 goto out;
227 }
228 args->truncate = ntohl(*p);
229 status = decode_fh(xdr, &args->fh);
230out:
3110ff80 231 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
3873bc50 232 return status;
1da177e4
LT		 233}
234
4aece6a1 235#if defined(CONFIG_NFS_V4_1)
93b717fd
TM		 236static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
237{
238 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
239 return decode_stateid(xdr, stateid);
240}
4aece6a1 241
f2a62561
FI		 242static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
243 struct xdr_stream *xdr,
244 struct cb_layoutrecallargs *args)
245{
246 __be32 *p;
247 __be32 status = 0;
248 uint32_t iomode;
249
f2a62561
FI		 250 p = read_buf(xdr, 4 * sizeof(uint32_t));
251 if (unlikely(p == NULL)) {
252 status = htonl(NFS4ERR_BADXDR);
253 goto out;
254 }
255
256 args->cbl_layout_type = ntohl(*p++);
257 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
25985edc 258 * as it is unusable and ignored with the other types.
f2a62561
FI		 259 */
260 iomode = ntohl(*p++);
261 args->cbl_layoutchanged = ntohl(*p++);
262 args->cbl_recall_type = ntohl(*p++);
263
264 if (args->cbl_recall_type == RETURN_FILE) {
265 args->cbl_range.iomode = iomode;
266 status = decode_fh(xdr, &args->cbl_fh);
267 if (unlikely(status != 0))
268 goto out;
269
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_range.offset);
276 p = xdr_decode_hyper(p, &args->cbl_range.length);
93b717fd 277 status = decode_layout_stateid(xdr, &args->cbl_stateid);
f2a62561
FI		 278 if (unlikely(status != 0))
279 goto out;
280 } else if (args->cbl_recall_type == RETURN_FSID) {
281 p = read_buf(xdr, 2 * sizeof(uint64_t));
282 if (unlikely(p == NULL)) {
283 status = htonl(NFS4ERR_BADXDR);
284 goto out;
285 }
286 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
287 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
288 } else if (args->cbl_recall_type != RETURN_ALL) {
289 status = htonl(NFS4ERR_BADXDR);
290 goto out;
291 }
292 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
293 __func__,
294 args->cbl_layout_type, iomode,
295 args->cbl_layoutchanged, args->cbl_recall_type);
296out:
297 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
298 return status;
299}
300
1be5683b
ME		 301static
302__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
303 struct xdr_stream *xdr,
304 struct cb_devicenotifyargs *args)
305{
306 __be32 *p;
307 __be32 status = 0;
308 u32 tmp;
309 int n, i;
310 args->ndevs = 0;
311
312 /* Num of device notifications */
313 p = read_buf(xdr, sizeof(uint32_t));
314 if (unlikely(p == NULL)) {
315 status = htonl(NFS4ERR_BADXDR);
316 goto out;
317 }
318 n = ntohl(*p++);
319 if (n <= 0)
320 goto out;
363e0df0
DC		 321 if (n > ULONG_MAX / sizeof(*args->devs)) {
322 status = htonl(NFS4ERR_BADXDR);
323 goto out;
324 }
1be5683b 325
a4f743a6 326 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
1be5683b
ME		 327 if (!args->devs) {
328 status = htonl(NFS4ERR_DELAY);
329 goto out;
330 }
331
332 /* Decode each dev notification */
333 for (i = 0; i < n; i++) {
334 struct cb_devicenotifyitem *dev = &args->devs[i];
335
336 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
337 if (unlikely(p == NULL)) {
338 status = htonl(NFS4ERR_BADXDR);
339 goto err;
340 }
341
342 tmp = ntohl(*p++); /* bitmap size */
343 if (tmp != 1) {
344 status = htonl(NFS4ERR_INVAL);
345 goto err;
346 }
347 dev->cbd_notify_type = ntohl(*p++);
348 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
349 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
350 status = htonl(NFS4ERR_INVAL);
351 goto err;
352 }
353
354 tmp = ntohl(*p++); /* opaque size */
355 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
356 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
357 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
358 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
359 status = htonl(NFS4ERR_INVAL);
360 goto err;
361 }
362 dev->cbd_layout_type = ntohl(*p++);
363 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
364 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
365
366 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
367 p = read_buf(xdr, sizeof(uint32_t));
368 if (unlikely(p == NULL)) {
369 status = htonl(NFS4ERR_BADXDR);
370 goto err;
371 }
372 dev->cbd_immediate = ntohl(*p++);
373 } else {
374 dev->cbd_immediate = 0;
375 }
376
377 args->ndevs++;
378
379 dprintk("%s: type %d layout 0x%x immediate %d\n",
380 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
381 dev->cbd_immediate);
382 }
383out:
384 dprintk("%s: status %d ndevs %d\n",
385 __func__, ntohl(status), args->ndevs);
386 return status;
387err:
388 kfree(args->devs);
389 goto out;
390}
391
9733f0d9 392static __be32 decode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 393 struct nfs4_sessionid *sid)
394{
9733f0d9 395 __be32 *p;
4aece6a1 396
590184a6 397 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
4aece6a1 398 if (unlikely(p == NULL))
a419aef8 399 return htonl(NFS4ERR_RESOURCE);
4aece6a1 400
590184a6 401 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 402 return 0;
403}
404
9733f0d9 405static __be32 decode_rc_list(struct xdr_stream *xdr,
4aece6a1
BH		 406 struct referring_call_list *rc_list)
407{
9733f0d9 408 __be32 *p;
4aece6a1 409 int i;
9733f0d9 410 __be32 status;
4aece6a1
BH		 411
412 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
413 if (status)
414 goto out;
415
416 status = htonl(NFS4ERR_RESOURCE);
417 p = read_buf(xdr, sizeof(uint32_t));
418 if (unlikely(p == NULL))
419 goto out;
420
421 rc_list->rcl_nrefcalls = ntohl(*p++);
422 if (rc_list->rcl_nrefcalls) {
423 p = read_buf(xdr,
424 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
425 if (unlikely(p == NULL))
426 goto out;
a4f743a6 427 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
4aece6a1
BH		 428 sizeof(*rc_list->rcl_refcalls),
429 GFP_KERNEL);
430 if (unlikely(rc_list->rcl_refcalls == NULL))
431 goto out;
432 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
433 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
434 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
435 }
436 }
437 status = 0;
438
439out:
440 return status;
441}
442
9733f0d9 443static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
4aece6a1
BH		 444 struct xdr_stream *xdr,
445 struct cb_sequenceargs *args)
446{
9733f0d9 447 __be32 *p;
4aece6a1 448 int i;
9733f0d9 449 __be32 status;
4aece6a1
BH		 450
451 status = decode_sessionid(xdr, &args->csa_sessionid);
452 if (status)
453 goto out;
454
455 status = htonl(NFS4ERR_RESOURCE);
456 p = read_buf(xdr, 5 * sizeof(uint32_t));
457 if (unlikely(p == NULL))
458 goto out;
459
65fc64e5 460 args->csa_addr = svc_addr(rqstp);
4aece6a1
BH		 461 args->csa_sequenceid = ntohl(*p++);
462 args->csa_slotid = ntohl(*p++);
463 args->csa_highestslotid = ntohl(*p++);
464 args->csa_cachethis = ntohl(*p++);
465 args->csa_nrclists = ntohl(*p++);
466 args->csa_rclists = NULL;
467 if (args->csa_nrclists) {
0439f31c
DC		 468 args->csa_rclists = kmalloc_array(args->csa_nrclists,
469 sizeof(*args->csa_rclists),
470 GFP_KERNEL);
4aece6a1
BH		 471 if (unlikely(args->csa_rclists == NULL))
472 goto out;
473
474 for (i = 0; i < args->csa_nrclists; i++) {
475 status = decode_rc_list(xdr, &args->csa_rclists[i]);
d8ba1f97
TM		 476 if (status) {
477 args->csa_nrclists = i;
4aece6a1 478 goto out_free;
d8ba1f97 479 }
4aece6a1
BH		 480 }
481 }
482 status = 0;
483
484 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
485 "highestslotid %u cachethis %d nrclists %u\n",
486 __func__,
487 ((u32 *)&args->csa_sessionid)[0],
488 ((u32 *)&args->csa_sessionid)[1],
489 ((u32 *)&args->csa_sessionid)[2],
490 ((u32 *)&args->csa_sessionid)[3],
491 args->csa_sequenceid, args->csa_slotid,
492 args->csa_highestslotid, args->csa_cachethis,
493 args->csa_nrclists);
494out:
495 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
496 return status;
497
498out_free:
499 for (i = 0; i < args->csa_nrclists; i++)
500 kfree(args->csa_rclists[i].rcl_refcalls);
501 kfree(args->csa_rclists);
502 goto out;
503}
504
9733f0d9 505static __be32 decode_recallany_args(struct svc_rqst *rqstp,
31f09607
AB		 506 struct xdr_stream *xdr,
507 struct cb_recallanyargs *args)
508{
d743c3c9
PT		 509 uint32_t bitmap[2];
510 __be32 *p, status;
31f09607 511
31f09607
AB		 512 p = read_buf(xdr, 4);
513 if (unlikely(p == NULL))
514 return htonl(NFS4ERR_BADXDR);
515 args->craa_objs_to_keep = ntohl(*p++);
d743c3c9
PT		 516 status = decode_bitmap(xdr, bitmap);
517 if (unlikely(status))
518 return status;
519 args->craa_type_mask = bitmap[0];
31f09607
AB		 520
521 return 0;
522}
523
9733f0d9 524static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
b9efa1b2
AA		 525 struct xdr_stream *xdr,
526 struct cb_recallslotargs *args)
527{
528 __be32 *p;
529
b9efa1b2
AA		 530 p = read_buf(xdr, 4);
531 if (unlikely(p == NULL))
532 return htonl(NFS4ERR_BADXDR);
d5fb4ce3 533 args->crsa_target_highest_slotid = ntohl(*p++);
b9efa1b2
AA		 534 return 0;
535}
536
4aece6a1
BH		 537#endif /* CONFIG_NFS_V4_1 */
538
e6f684f6 539static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
1da177e4 540{
5704fdeb 541 __be32 *p;
1da177e4
LT		 542
543 p = xdr_reserve_space(xdr, 4 + len);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_RESOURCE);
546 xdr_encode_opaque(p, str, len);
547 return 0;
548}
549
550#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
551#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
5704fdeb 552static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
1da177e4 553{
5704fdeb
AV		 554 __be32 bm[2];
555 __be32 *p;
1da177e4
LT		 556
557 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
558 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
559 if (bm[1] != 0) {
560 p = xdr_reserve_space(xdr, 16);
561 if (unlikely(p == NULL))
562 return htonl(NFS4ERR_RESOURCE);
563 *p++ = htonl(2);
564 *p++ = bm[0];
565 *p++ = bm[1];
566 } else if (bm[0] != 0) {
567 p = xdr_reserve_space(xdr, 12);
568 if (unlikely(p == NULL))
569 return htonl(NFS4ERR_RESOURCE);
570 *p++ = htonl(1);
571 *p++ = bm[0];
572 } else {
573 p = xdr_reserve_space(xdr, 8);
574 if (unlikely(p == NULL))
575 return htonl(NFS4ERR_RESOURCE);
576 *p++ = htonl(0);
577 }
578 *savep = p;
579 return 0;
580}
581
e6f684f6 582static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
1da177e4 583{
5704fdeb 584 __be32 *p;
1da177e4
LT		 585
586 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
587 return 0;
588 p = xdr_reserve_space(xdr, 8);
90dc7d27 589 if (unlikely(!p))
1da177e4
LT		 590 return htonl(NFS4ERR_RESOURCE);
591 p = xdr_encode_hyper(p, change);
592 return 0;
593}
594
e6f684f6 595static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
1da177e4 596{
5704fdeb 597 __be32 *p;
1da177e4
LT		 598
599 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
600 return 0;
601 p = xdr_reserve_space(xdr, 8);
90dc7d27 602 if (unlikely(!p))
1da177e4
LT		 603 return htonl(NFS4ERR_RESOURCE);
604 p = xdr_encode_hyper(p, size);
605 return 0;
606}
607
e6f684f6 608static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
1da177e4 609{
5704fdeb 610 __be32 *p;
1da177e4
LT		 611
612 p = xdr_reserve_space(xdr, 12);
90dc7d27 613 if (unlikely(!p))
1da177e4
LT		 614 return htonl(NFS4ERR_RESOURCE);
615 p = xdr_encode_hyper(p, time->tv_sec);
616 *p = htonl(time->tv_nsec);
617 return 0;
618}
619
e6f684f6 620static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 621{
622 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
623 return 0;
624 return encode_attr_time(xdr,time);
625}
626
e6f684f6 627static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 628{
629 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
630 return 0;
631 return encode_attr_time(xdr,time);
632}
633
e6f684f6 634static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
1da177e4 635{
e6f684f6 636 __be32 status;
1da177e4
LT		 637
638 hdr->status = xdr_reserve_space(xdr, 4);
639 if (unlikely(hdr->status == NULL))
640 return htonl(NFS4ERR_RESOURCE);
641 status = encode_string(xdr, hdr->taglen, hdr->tag);
642 if (unlikely(status != 0))
643 return status;
644 hdr->nops = xdr_reserve_space(xdr, 4);
645 if (unlikely(hdr->nops == NULL))
646 return htonl(NFS4ERR_RESOURCE);
647 return 0;
648}
649
e6f684f6 650static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
1da177e4 651{
5704fdeb 652 __be32 *p;
1da177e4
LT		 653
654 p = xdr_reserve_space(xdr, 8);
655 if (unlikely(p == NULL))
31d2b435 656 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 657 *p++ = htonl(op);
658 *p = res;
659 return 0;
660}
661
e6f684f6 662static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
1da177e4 663{
5704fdeb 664 __be32 *savep = NULL;
e6f684f6 665 __be32 status = res->status;
1da177e4
LT		 666
667 if (unlikely(status != 0))
668 goto out;
669 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
670 if (unlikely(status != 0))
671 goto out;
672 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
673 if (unlikely(status != 0))
674 goto out;
675 status = encode_attr_size(xdr, res->bitmap, res->size);
676 if (unlikely(status != 0))
677 goto out;
678 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
679 if (unlikely(status != 0))
680 goto out;
681 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
682 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
683out:
3110ff80 684 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 685 return status;
686}
687
34bc47c9
BH		 688#if defined(CONFIG_NFS_V4_1)
689
9733f0d9 690static __be32 encode_sessionid(struct xdr_stream *xdr,
4aece6a1
BH		 691 const struct nfs4_sessionid *sid)
692{
9733f0d9 693 __be32 *p;
4aece6a1 694
590184a6 695 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 696 if (unlikely(p == NULL))
697 return htonl(NFS4ERR_RESOURCE);
698
590184a6 699 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
4aece6a1
BH		 700 return 0;
701}
702
9733f0d9 703static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
4aece6a1
BH		 704 struct xdr_stream *xdr,
705 const struct cb_sequenceres *res)
706{
9733f0d9 707 __be32 *p;
e216c8c7 708 __be32 status = res->csr_status;
4aece6a1
BH		 709
710 if (unlikely(status != 0))
711 goto out;
712
e0a63c0b
KM		 713 status = encode_sessionid(xdr, &res->csr_sessionid);
714 if (status)
715 goto out;
4aece6a1
BH		 716
717 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
718 if (unlikely(p == NULL))
719 return htonl(NFS4ERR_RESOURCE);
720
721 *p++ = htonl(res->csr_sequenceid);
722 *p++ = htonl(res->csr_slotid);
723 *p++ = htonl(res->csr_highestslotid);
724 *p++ = htonl(res->csr_target_highestslotid);
725out:
726 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
727 return status;
728}
729
34bc47c9
BH		 730static __be32
731preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
732{
281fe15d
BH		 733 if (op_nr == OP_CB_SEQUENCE) {
734 if (nop != 0)
735 return htonl(NFS4ERR_SEQUENCE_POS);
736 } else {
737 if (nop == 0)
738 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
739 }
740
34bc47c9
BH		 741 switch (op_nr) {
742 case OP_CB_GETATTR:
743 case OP_CB_RECALL:
4aece6a1 744 case OP_CB_SEQUENCE:
31f09607 745 case OP_CB_RECALL_ANY:
b9efa1b2 746 case OP_CB_RECALL_SLOT:
f2a62561 747 case OP_CB_LAYOUTRECALL:
1be5683b 748 case OP_CB_NOTIFY_DEVICEID:
34bc47c9
BH		 749 *op = &callback_ops[op_nr];
750 break;
751
34bc47c9
BH		 752 case OP_CB_NOTIFY:
753 case OP_CB_PUSH_DELEG:
34bc47c9 754 case OP_CB_RECALLABLE_OBJ_AVAIL:
34bc47c9
BH		 755 case OP_CB_WANTS_CANCELLED:
756 case OP_CB_NOTIFY_LOCK:
757 return htonl(NFS4ERR_NOTSUPP);
758
759 default:
760 return htonl(NFS4ERR_OP_ILLEGAL);
761 }
762
763 return htonl(NFS_OK);
764}
765
810d82e6
TM		 766static void nfs4_callback_free_slot(struct nfs4_session *session,
767 struct nfs4_slot *slot)
42acd021
AA		 768{
769 struct nfs4_slot_table *tbl = &session->bc_slot_table;
770
771 spin_lock(&tbl->slot_tbl_lock);
772 /*
773 * Let the state manager know callback processing done.
774 * A single slot, so highest used slotid is either 0 or -1
775 */
810d82e6 776 nfs4_free_slot(tbl, slot);
774d5f14 777 nfs4_slot_tbl_drain_complete(tbl);
42acd021
AA		 778 spin_unlock(&tbl->slot_tbl_lock);
779}
780
55a67399 781static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021 782{
810d82e6
TM		 783 if (cps->slot) {
784 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
785 cps->slot = NULL;
786 }
42acd021
AA		 787}
788
34bc47c9
BH		 789#else /* CONFIG_NFS_V4_1 */
790
791static __be32
792preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
793{
794 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
795}
796
55a67399 797static void nfs4_cb_free_slot(struct cb_process_state *cps)
42acd021
AA		 798{
799}
34bc47c9
BH		 800#endif /* CONFIG_NFS_V4_1 */
801
6b140b85
BS		 802#ifdef CONFIG_NFS_V4_2
803static __be32
804preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
805{
806 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
807 if (status != htonl(NFS4ERR_OP_ILLEGAL))
808 return status;
809
810 if (op_nr == OP_CB_OFFLOAD)
811 return htonl(NFS4ERR_NOTSUPP);
812 return htonl(NFS4ERR_OP_ILLEGAL);
813}
814#else /* CONFIG_NFS_V4_2 */
815static __be32
816preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
817{
818 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
819}
820#endif /* CONFIG_NFS_V4_2 */
821
34bc47c9
BH		 822static __be32
823preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
824{
825 switch (op_nr) {
826 case OP_CB_GETATTR:
827 case OP_CB_RECALL:
828 *op = &callback_ops[op_nr];
829 break;
830 default:
831 return htonl(NFS4ERR_OP_ILLEGAL);
832 }
833
834 return htonl(NFS_OK);
835}
836
459de2ed 837static __be32 process_op(int nop, struct svc_rqst *rqstp,
1da177e4 838 struct xdr_stream *xdr_in, void *argp,
c36fca52
AA		 839 struct xdr_stream *xdr_out, void *resp,
840 struct cb_process_state *cps)
1da177e4 841{
a162a6b8 842 struct callback_op *op = &callback_ops[0];
31d2b435 843 unsigned int op_nr;
34bc47c9 844 __be32 status;
1da177e4 845 long maxlen;
e6f684f6 846 __be32 res;
1da177e4 847
3110ff80 848 dprintk("%s: start\n", __func__);
1da177e4 849 status = decode_op_hdr(xdr_in, &op_nr);
31d2b435
AA		 850 if (unlikely(status))
851 return status;
1da177e4 852
34bc47c9 853 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
459de2ed 854 __func__, cps->minorversion, nop, op_nr);
34bc47c9 855
6b140b85
BS		 856 switch (cps->minorversion) {
857 case 0:
858 status = preprocess_nfs4_op(op_nr, &op);
859 break;
860 case 1:
861 status = preprocess_nfs41_op(nop, op_nr, &op);
862 break;
863 case 2:
864 status = preprocess_nfs42_op(nop, op_nr, &op);
865 break;
866 default:
867 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
868 }
34bc47c9 869
34bc47c9
BH		 870 if (status == htonl(NFS4ERR_OP_ILLEGAL))
871 op_nr = OP_CB_ILLEGAL;
b92b3019
AA		 872 if (status)
873 goto encode_hdr;
31d2b435 874
c36fca52
AA		 875 if (cps->drc_status) {
876 status = cps->drc_status;
4911096f
AA		 877 goto encode_hdr;
878 }
879
1da177e4
LT		 880 maxlen = xdr_out->end - xdr_out->p;
881 if (maxlen > 0 && maxlen < PAGE_SIZE) {
e95e60da
AA		 882 status = op->decode_args(rqstp, xdr_in, argp);
883 if (likely(status == 0))
c36fca52 884 status = op->process_op(argp, resp, cps);
1da177e4
LT		 885 } else
886 status = htonl(NFS4ERR_RESOURCE);
887
b92b3019 888encode_hdr:
1da177e4 889 res = encode_op_hdr(xdr_out, op_nr, status);
31d2b435
AA		 890 if (unlikely(res))
891 return res;
1da177e4
LT		 892 if (op->encode_res != NULL && status == 0)
893 status = op->encode_res(rqstp, xdr_out, resp);
3110ff80 894 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
1da177e4
LT		 895 return status;
896}
897
898/*
899 * Decode, process and encode a COMPOUND
900 */
7111c66e 901static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4 902{
3a6258e1
TM		 903 struct cb_compound_hdr_arg hdr_arg = { 0 };
904 struct cb_compound_hdr_res hdr_res = { NULL };
1da177e4 905 struct xdr_stream xdr_in, xdr_out;
c36fca52
AA		 906 __be32 *p, status;
907 struct cb_process_state cps = {
908 .drc_status = 0,
909 .clp = NULL,
9695c705 910 .net = SVC_NET(rqstp),
c36fca52 911 };
3a6258e1 912 unsigned int nops = 0;
1da177e4 913
3110ff80 914 dprintk("%s: start\n", __func__);
1da177e4 915
756b9b37 916 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
1da177e4 917
5704fdeb 918 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
1da177e4
LT		 919 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
920
3a6258e1 921 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
4ed0d83d 922 if (status == htonl(NFS4ERR_RESOURCE))
3a6258e1
TM		 923 return rpc_garbage_args;
924
c36fca52 925 if (hdr_arg.minorversion == 0) {
9695c705 926 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
778be232 927 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
a4e187d8 928 goto out_invalidcred;
778be232 929 }
c36fca52 930
459de2ed 931 cps.minorversion = hdr_arg.minorversion;
1da177e4
LT		 932 hdr_res.taglen = hdr_arg.taglen;
933 hdr_res.tag = hdr_arg.tag;
3a6258e1
TM		 934 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
935 return rpc_system_err;
1da177e4 936
3a6258e1 937 while (status == 0 && nops != hdr_arg.nops) {
459de2ed
BS		 938 status = process_op(nops, rqstp, &xdr_in,
939 argp, &xdr_out, resp, &cps);
1da177e4
LT		 940 nops++;
941 }
3a6258e1 942
31d2b435
AA		 943 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
944 * resource error in cb_compound status without returning op */
945 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
946 status = htonl(NFS4ERR_RESOURCE);
947 nops--;
948 }
949
1da177e4
LT		 950 *hdr_res.status = status;
951 *hdr_res.nops = htonl(nops);
55a67399 952 nfs4_cb_free_slot(&cps);
c36fca52 953 nfs_put_client(cps.clp);
3110ff80 954 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
1da177e4 955 return rpc_success;
a4e187d8
CL		 956
957out_invalidcred:
958 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
959 return rpc_autherr_badcred;
1da177e4
LT		 960}
961
962/*
963 * Define NFS4 callback COMPOUND ops.
964 */
965static struct callback_op callback_ops[] = {
966 [0] = {
967 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
968 },
969 [OP_CB_GETATTR] = {
970 .process_op = (callback_process_op_t)nfs4_callback_getattr,
971 .decode_args = (callback_decode_arg_t)decode_getattr_args,
972 .encode_res = (callback_encode_res_t)encode_getattr_res,
973 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
974 },
975 [OP_CB_RECALL] = {
976 .process_op = (callback_process_op_t)nfs4_callback_recall,
977 .decode_args = (callback_decode_arg_t)decode_recall_args,
978 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
4aece6a1
BH		 979 },
980#if defined(CONFIG_NFS_V4_1)
f2a62561
FI		 981 [OP_CB_LAYOUTRECALL] = {
982 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
983 .decode_args =
984 (callback_decode_arg_t)decode_layoutrecall_args,
985 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
986 },
1be5683b
ME		 987 [OP_CB_NOTIFY_DEVICEID] = {
988 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
989 .decode_args =
990 (callback_decode_arg_t)decode_devicenotify_args,
991 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
992 },
4aece6a1
BH		 993 [OP_CB_SEQUENCE] = {
994 .process_op = (callback_process_op_t)nfs4_callback_sequence,
995 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
996 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
997 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
998 },
31f09607
AB		 999 [OP_CB_RECALL_ANY] = {
1000 .process_op = (callback_process_op_t)nfs4_callback_recallany,
1001 .decode_args = (callback_decode_arg_t)decode_recallany_args,
1002 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1003 },
b9efa1b2
AA		 1004 [OP_CB_RECALL_SLOT] = {
1005 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
1006 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
1007 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1008 },
4aece6a1 1009#endif /* CONFIG_NFS_V4_1 */
1da177e4
LT		 1010};
1011
1012/*
1013 * Define NFS4 callback procedures
1014 */
1015static struct svc_procedure nfs4_callback_procedures1[] = {
1016 [CB_NULL] = {
1017 .pc_func = nfs4_callback_null,
1018 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1019 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1020 .pc_xdrressize = 1,
1021 },
1022 [CB_COMPOUND] = {
1023 .pc_func = nfs4_callback_compound,
1024 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1025 .pc_argsize = 256,
1026 .pc_ressize = 256,
1027 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1028 }
1029};
1030
1031struct svc_version nfs4_callback_version1 = {
1032 .vs_vers = 1,
1033 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1034 .vs_proc = nfs4_callback_procedures1,
1035 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1036 .vs_dispatch = NULL,
49697ee7 1037 .vs_hidden = 1,
1da177e4
LT		 1038};
1039
07bccc2d
AB		 1040struct svc_version nfs4_callback_version4 = {
1041 .vs_vers = 4,
1042 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1043 .vs_proc = nfs4_callback_procedures1,
1044 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1045 .vs_dispatch = NULL,
6070295e 1046 .vs_hidden = 1,
07bccc2d 1047};
Linux 6.x block layer and io_uring tree(s)