callback_xdr.c 25.7 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11
/*
 * linux/fs/nfs/callback_xdr.c
 *
 * Copyright (C) 2004 Trond Myklebust
 *
 * NFSv4 callback encode/decode procedures
 */
#include <linux/kernel.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
12 13
#include <linux/ratelimit.h>
#include <linux/printk.h>
14
#include <linux/slab.h>
15
#include <linux/sunrpc/bc_xprt.h>
16
#include "nfs4_fs.h"
L
Linus Torvalds 已提交
17
#include "callback.h"
18
#include "internal.h"
19
#include "nfs4session.h"
L
Linus Torvalds 已提交
20

21 22 23 24 25 26 27 28
#define CB_OP_TAGLEN_MAXSZ		(512)
#define CB_OP_HDR_RES_MAXSZ		(2 * 4) // opcode, status
#define CB_OP_GETATTR_BITMAP_MAXSZ	(4 * 4) // bitmap length, 3 bitmaps
#define CB_OP_GETATTR_RES_MAXSZ		(CB_OP_HDR_RES_MAXSZ + \
					 CB_OP_GETATTR_BITMAP_MAXSZ + \
					 /* change, size, ctime, mtime */\
					 (2 + 2 + 3 + 3) * 4)
#define CB_OP_RECALL_RES_MAXSZ		(CB_OP_HDR_RES_MAXSZ)
L
Linus Torvalds 已提交
29

30
#if defined(CONFIG_NFS_V4_1)
F
Fred Isaman 已提交
31
#define CB_OP_LAYOUTRECALL_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
M
Marc Eshel 已提交
32
#define CB_OP_DEVICENOTIFY_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
33
#define CB_OP_SEQUENCE_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ + \
34 35
					 NFS4_MAX_SESSIONID_LEN + \
					 (1 + 3) * 4) // seqid, 3 slotids
36
#define CB_OP_RECALLANY_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
A
Andy Adamson 已提交
37
#define CB_OP_RECALLSLOT_RES_MAXSZ	(CB_OP_HDR_RES_MAXSZ)
38 39
#endif /* CONFIG_NFS_V4_1 */

L
Linus Torvalds 已提交
40 41
#define NFSDBG_FACILITY NFSDBG_CALLBACK

42 43 44
/* Internal error code */
#define NFS4ERR_RESOURCE_HDR	11050

45 46
typedef __be32 (*callback_process_op_t)(void *, void *,
					struct cb_process_state *);
47 48
typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
L
Linus Torvalds 已提交
49 50 51 52 53 54 55 56 57 58 59


struct callback_op {
	callback_process_op_t process_op;
	callback_decode_arg_t decode_args;
	callback_encode_res_t encode_res;
	long res_maxsize;
};

static struct callback_op callback_ops[];

A
Al Viro 已提交
60
static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
L
Linus Torvalds 已提交
61 62 63 64
{
	return htonl(NFS4_OK);
}

65
static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
66 67 68 69
{
	return xdr_argsize_check(rqstp, p);
}

70
static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
L
Linus Torvalds 已提交
71 72 73 74
{
	return xdr_ressize_check(rqstp, p);
}

75
static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
L
Linus Torvalds 已提交
76
{
77
	__be32 *p;
L
Linus Torvalds 已提交
78 79 80

	p = xdr_inline_decode(xdr, nbytes);
	if (unlikely(p == NULL))
81
		printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
L
Linus Torvalds 已提交
82 83 84
	return p;
}

85
static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
L
Linus Torvalds 已提交
86
{
87
	__be32 *p;
L
Linus Torvalds 已提交
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	*len = ntohl(*p);

	if (*len != 0) {
		p = read_buf(xdr, *len);
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_RESOURCE);
		*str = (const char *)p;
	} else
		*str = NULL;

	return 0;
}

105
static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
L
Linus Torvalds 已提交
106
{
107
	__be32 *p;
L
Linus Torvalds 已提交
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	fh->size = ntohl(*p);
	if (fh->size > NFS4_FHSIZE)
		return htonl(NFS4ERR_BADHANDLE);
	p = read_buf(xdr, fh->size);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	memcpy(&fh->data[0], p, fh->size);
	memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
	return 0;
}

123
static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
L
Linus Torvalds 已提交
124
{
125
	__be32 *p;
L
Linus Torvalds 已提交
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141
	unsigned int attrlen;

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	attrlen = ntohl(*p);
	p = read_buf(xdr, attrlen << 2);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	if (likely(attrlen > 0))
		bitmap[0] = ntohl(*p++);
	if (attrlen > 1)
		bitmap[1] = ntohl(*p);
	return 0;
}

142
static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
L
Linus Torvalds 已提交
143
{
144
	__be32 *p;
L
Linus Torvalds 已提交
145

146
	p = read_buf(xdr, NFS4_STATEID_SIZE);
L
Linus Torvalds 已提交
147 148
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
149
	memcpy(stateid, p, NFS4_STATEID_SIZE);
L
Linus Torvalds 已提交
150 151 152
	return 0;
}

153
static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
L
Linus Torvalds 已提交
154
{
155
	__be32 *p;
156
	__be32 status;
L
Linus Torvalds 已提交
157 158 159 160 161

	status = decode_string(xdr, &hdr->taglen, &hdr->tag);
	if (unlikely(status != 0))
		return status;
	/* We do not like overly long tags! */
162
	if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
163
		printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
164
				__func__, hdr->taglen);
L
Linus Torvalds 已提交
165 166 167 168 169
		return htonl(NFS4ERR_RESOURCE);
	}
	p = read_buf(xdr, 12);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
170
	hdr->minorversion = ntohl(*p++);
171 172
	/* Check for minor version support */
	if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
173
		hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
174
	} else {
175
		pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
176 177
			"illegal minor version %u!\n",
			__func__, hdr->minorversion);
L
Linus Torvalds 已提交
178 179 180
		return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
	}
	hdr->nops = ntohl(*p);
181 182
	dprintk("%s: minorversion %d nops %d\n", __func__,
		hdr->minorversion, hdr->nops);
L
Linus Torvalds 已提交
183 184 185
	return 0;
}

186
static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
L
Linus Torvalds 已提交
187
{
188
	__be32 *p;
L
Linus Torvalds 已提交
189 190
	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
191
		return htonl(NFS4ERR_RESOURCE_HDR);
L
Linus Torvalds 已提交
192 193 194 195
	*op = ntohl(*p);
	return 0;
}

196
static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
L
Linus Torvalds 已提交
197
{
198
	__be32 status;
L
Linus Torvalds 已提交
199 200 201 202 203 204

	status = decode_fh(xdr, &args->fh);
	if (unlikely(status != 0))
		goto out;
	status = decode_bitmap(xdr, args->bitmap);
out:
205
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
L
Linus Torvalds 已提交
206 207 208
	return status;
}

209
static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
L
Linus Torvalds 已提交
210
{
211
	__be32 *p;
212
	__be32 status;
L
Linus Torvalds 已提交
213 214 215 216 217 218 219 220 221 222 223 224

	status = decode_stateid(xdr, &args->stateid);
	if (unlikely(status != 0))
		goto out;
	p = read_buf(xdr, 4);
	if (unlikely(p == NULL)) {
		status = htonl(NFS4ERR_RESOURCE);
		goto out;
	}
	args->truncate = ntohl(*p);
	status = decode_fh(xdr, &args->fh);
out:
225
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226
	return status;
L
Linus Torvalds 已提交
227 228
}

229 230
#if defined(CONFIG_NFS_V4_1)

F
Fred Isaman 已提交
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
				       struct xdr_stream *xdr,
				       struct cb_layoutrecallargs *args)
{
	__be32 *p;
	__be32 status = 0;
	uint32_t iomode;

	p = read_buf(xdr, 4 * sizeof(uint32_t));
	if (unlikely(p == NULL)) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}

	args->cbl_layout_type = ntohl(*p++);
	/* Depite the spec's xdr, iomode really belongs in the FILE switch,
L
Lucas De Marchi 已提交
247
	 * as it is unusable and ignored with the other types.
F
Fred Isaman 已提交
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
	 */
	iomode = ntohl(*p++);
	args->cbl_layoutchanged = ntohl(*p++);
	args->cbl_recall_type = ntohl(*p++);

	if (args->cbl_recall_type == RETURN_FILE) {
		args->cbl_range.iomode = iomode;
		status = decode_fh(xdr, &args->cbl_fh);
		if (unlikely(status != 0))
			goto out;

		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL)) {
			status = htonl(NFS4ERR_BADXDR);
			goto out;
		}
		p = xdr_decode_hyper(p, &args->cbl_range.offset);
		p = xdr_decode_hyper(p, &args->cbl_range.length);
		status = decode_stateid(xdr, &args->cbl_stateid);
		if (unlikely(status != 0))
			goto out;
	} else if (args->cbl_recall_type == RETURN_FSID) {
		p = read_buf(xdr, 2 * sizeof(uint64_t));
		if (unlikely(p == NULL)) {
			status = htonl(NFS4ERR_BADXDR);
			goto out;
		}
		p = xdr_decode_hyper(p, &args->cbl_fsid.major);
		p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
	} else if (args->cbl_recall_type != RETURN_ALL) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}
	dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
		__func__,
		args->cbl_layout_type, iomode,
		args->cbl_layoutchanged, args->cbl_recall_type);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

M
Marc Eshel 已提交
290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309
static
__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
				struct xdr_stream *xdr,
				struct cb_devicenotifyargs *args)
{
	__be32 *p;
	__be32 status = 0;
	u32 tmp;
	int n, i;
	args->ndevs = 0;

	/* Num of device notifications */
	p = read_buf(xdr, sizeof(uint32_t));
	if (unlikely(p == NULL)) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}
	n = ntohl(*p++);
	if (n <= 0)
		goto out;
310 311 312 313
	if (n > ULONG_MAX / sizeof(*args->devs)) {
		status = htonl(NFS4ERR_BADXDR);
		goto out;
	}
M
Marc Eshel 已提交
314

315
	args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
M
Marc Eshel 已提交
316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
	if (!args->devs) {
		status = htonl(NFS4ERR_DELAY);
		goto out;
	}

	/* Decode each dev notification */
	for (i = 0; i < n; i++) {
		struct cb_devicenotifyitem *dev = &args->devs[i];

		p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
		if (unlikely(p == NULL)) {
			status = htonl(NFS4ERR_BADXDR);
			goto err;
		}

		tmp = ntohl(*p++);	/* bitmap size */
		if (tmp != 1) {
			status = htonl(NFS4ERR_INVAL);
			goto err;
		}
		dev->cbd_notify_type = ntohl(*p++);
		if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
		    dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
			status = htonl(NFS4ERR_INVAL);
			goto err;
		}

		tmp = ntohl(*p++);	/* opaque size */
		if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
		     (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
		    ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
		     (tmp != NFS4_DEVICEID4_SIZE + 4))) {
			status = htonl(NFS4ERR_INVAL);
			goto err;
		}
		dev->cbd_layout_type = ntohl(*p++);
		memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
		p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);

		if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
			p = read_buf(xdr, sizeof(uint32_t));
			if (unlikely(p == NULL)) {
				status = htonl(NFS4ERR_BADXDR);
				goto err;
			}
			dev->cbd_immediate = ntohl(*p++);
		} else {
			dev->cbd_immediate = 0;
		}

		args->ndevs++;

		dprintk("%s: type %d layout 0x%x immediate %d\n",
			__func__, dev->cbd_notify_type, dev->cbd_layout_type,
			dev->cbd_immediate);
	}
out:
	dprintk("%s: status %d ndevs %d\n",
		__func__, ntohl(status), args->ndevs);
	return status;
err:
	kfree(args->devs);
	goto out;
}

381
static __be32 decode_sessionid(struct xdr_stream *xdr,
382 383
				 struct nfs4_sessionid *sid)
{
384
	__be32 *p;
385

386
	p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
387
	if (unlikely(p == NULL))
388
		return htonl(NFS4ERR_RESOURCE);
389

390
	memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
391 392 393
	return 0;
}

394
static __be32 decode_rc_list(struct xdr_stream *xdr,
395 396
			       struct referring_call_list *rc_list)
{
397
	__be32 *p;
398
	int i;
399
	__be32 status;
400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415

	status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
	if (status)
		goto out;

	status = htonl(NFS4ERR_RESOURCE);
	p = read_buf(xdr, sizeof(uint32_t));
	if (unlikely(p == NULL))
		goto out;

	rc_list->rcl_nrefcalls = ntohl(*p++);
	if (rc_list->rcl_nrefcalls) {
		p = read_buf(xdr,
			     rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
		if (unlikely(p == NULL))
			goto out;
416
		rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431
						sizeof(*rc_list->rcl_refcalls),
						GFP_KERNEL);
		if (unlikely(rc_list->rcl_refcalls == NULL))
			goto out;
		for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
			rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
			rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
		}
	}
	status = 0;

out:
	return status;
}

432
static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
433 434 435
					struct xdr_stream *xdr,
					struct cb_sequenceargs *args)
{
436
	__be32 *p;
437
	int i;
438
	__be32 status;
439 440 441 442 443 444 445 446 447 448

	status = decode_sessionid(xdr, &args->csa_sessionid);
	if (status)
		goto out;

	status = htonl(NFS4ERR_RESOURCE);
	p = read_buf(xdr, 5 * sizeof(uint32_t));
	if (unlikely(p == NULL))
		goto out;

449
	args->csa_addr = svc_addr(rqstp);
450 451 452 453 454 455 456
	args->csa_sequenceid = ntohl(*p++);
	args->csa_slotid = ntohl(*p++);
	args->csa_highestslotid = ntohl(*p++);
	args->csa_cachethis = ntohl(*p++);
	args->csa_nrclists = ntohl(*p++);
	args->csa_rclists = NULL;
	if (args->csa_nrclists) {
457 458 459
		args->csa_rclists = kmalloc_array(args->csa_nrclists,
						  sizeof(*args->csa_rclists),
						  GFP_KERNEL);
460 461 462 463 464
		if (unlikely(args->csa_rclists == NULL))
			goto out;

		for (i = 0; i < args->csa_nrclists; i++) {
			status = decode_rc_list(xdr, &args->csa_rclists[i]);
465 466
			if (status) {
				args->csa_nrclists = i;
467
				goto out_free;
468
			}
469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493
		}
	}
	status = 0;

	dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
		"highestslotid %u cachethis %d nrclists %u\n",
		__func__,
		((u32 *)&args->csa_sessionid)[0],
		((u32 *)&args->csa_sessionid)[1],
		((u32 *)&args->csa_sessionid)[2],
		((u32 *)&args->csa_sessionid)[3],
		args->csa_sequenceid, args->csa_slotid,
		args->csa_highestslotid, args->csa_cachethis,
		args->csa_nrclists);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;

out_free:
	for (i = 0; i < args->csa_nrclists; i++)
		kfree(args->csa_rclists[i].rcl_refcalls);
	kfree(args->csa_rclists);
	goto out;
}

494
static __be32 decode_recallany_args(struct svc_rqst *rqstp,
495 496 497
				      struct xdr_stream *xdr,
				      struct cb_recallanyargs *args)
{
P
Peng Tao 已提交
498 499
	uint32_t bitmap[2];
	__be32 *p, status;
500 501 502 503 504

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);
	args->craa_objs_to_keep = ntohl(*p++);
P
Peng Tao 已提交
505 506 507 508
	status = decode_bitmap(xdr, bitmap);
	if (unlikely(status))
		return status;
	args->craa_type_mask = bitmap[0];
509 510 511 512

	return 0;
}

513
static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
A
Andy Adamson 已提交
514 515 516 517 518 519 520 521
					struct xdr_stream *xdr,
					struct cb_recallslotargs *args)
{
	__be32 *p;

	p = read_buf(xdr, 4);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_BADXDR);
522
	args->crsa_target_highest_slotid = ntohl(*p++);
A
Andy Adamson 已提交
523 524 525
	return 0;
}

526 527
#endif /* CONFIG_NFS_V4_1 */

528
static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
L
Linus Torvalds 已提交
529
{
530
	__be32 *p;
L
Linus Torvalds 已提交
531 532 533 534 535 536 537 538 539 540

	p = xdr_reserve_space(xdr, 4 + len);
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);
	xdr_encode_opaque(p, str, len);
	return 0;
}

#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
541
static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
L
Linus Torvalds 已提交
542
{
543 544
	__be32 bm[2];
	__be32 *p;
L
Linus Torvalds 已提交
545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570

	bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
	bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
	if (bm[1] != 0) {
		p = xdr_reserve_space(xdr, 16);
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_RESOURCE);
		*p++ = htonl(2);
		*p++ = bm[0];
		*p++ = bm[1];
	} else if (bm[0] != 0) {
		p = xdr_reserve_space(xdr, 12);
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_RESOURCE);
		*p++ = htonl(1);
		*p++ = bm[0];
	} else {
		p = xdr_reserve_space(xdr, 8);
		if (unlikely(p == NULL))
			return htonl(NFS4ERR_RESOURCE);
		*p++ = htonl(0);
	}
	*savep = p;
	return 0;
}

571
static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
L
Linus Torvalds 已提交
572
{
573
	__be32 *p;
L
Linus Torvalds 已提交
574 575 576 577

	if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
		return 0;
	p = xdr_reserve_space(xdr, 8);
H
Harvey Harrison 已提交
578
	if (unlikely(!p))
L
Linus Torvalds 已提交
579 580 581 582 583
		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, change);
	return 0;
}

584
static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
L
Linus Torvalds 已提交
585
{
586
	__be32 *p;
L
Linus Torvalds 已提交
587 588 589 590

	if (!(bitmap[0] & FATTR4_WORD0_SIZE))
		return 0;
	p = xdr_reserve_space(xdr, 8);
H
Harvey Harrison 已提交
591
	if (unlikely(!p))
L
Linus Torvalds 已提交
592 593 594 595 596
		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, size);
	return 0;
}

597
static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
L
Linus Torvalds 已提交
598
{
599
	__be32 *p;
L
Linus Torvalds 已提交
600 601

	p = xdr_reserve_space(xdr, 12);
H
Harvey Harrison 已提交
602
	if (unlikely(!p))
L
Linus Torvalds 已提交
603 604 605 606 607 608
		return htonl(NFS4ERR_RESOURCE);
	p = xdr_encode_hyper(p, time->tv_sec);
	*p = htonl(time->tv_nsec);
	return 0;
}

609
static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
L
Linus Torvalds 已提交
610 611 612 613 614 615
{
	if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
		return 0;
	return encode_attr_time(xdr,time);
}

616
static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
L
Linus Torvalds 已提交
617 618 619 620 621 622
{
	if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
		return 0;
	return encode_attr_time(xdr,time);
}

623
static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
L
Linus Torvalds 已提交
624
{
625
	__be32 status;
L
Linus Torvalds 已提交
626 627 628 629 630 631 632 633 634 635 636 637 638

	hdr->status = xdr_reserve_space(xdr, 4);
	if (unlikely(hdr->status == NULL))
		return htonl(NFS4ERR_RESOURCE);
	status = encode_string(xdr, hdr->taglen, hdr->tag);
	if (unlikely(status != 0))
		return status;
	hdr->nops = xdr_reserve_space(xdr, 4);
	if (unlikely(hdr->nops == NULL))
		return htonl(NFS4ERR_RESOURCE);
	return 0;
}

639
static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
L
Linus Torvalds 已提交
640
{
641
	__be32 *p;
L
Linus Torvalds 已提交
642 643 644
	
	p = xdr_reserve_space(xdr, 8);
	if (unlikely(p == NULL))
645
		return htonl(NFS4ERR_RESOURCE_HDR);
L
Linus Torvalds 已提交
646 647 648 649 650
	*p++ = htonl(op);
	*p = res;
	return 0;
}

651
static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
L
Linus Torvalds 已提交
652
{
653
	__be32 *savep = NULL;
654
	__be32 status = res->status;
L
Linus Torvalds 已提交
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672
	
	if (unlikely(status != 0))
		goto out;
	status = encode_attr_bitmap(xdr, res->bitmap, &savep);
	if (unlikely(status != 0))
		goto out;
	status = encode_attr_change(xdr, res->bitmap, res->change_attr);
	if (unlikely(status != 0))
		goto out;
	status = encode_attr_size(xdr, res->bitmap, res->size);
	if (unlikely(status != 0))
		goto out;
	status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
	if (unlikely(status != 0))
		goto out;
	status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
	*savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
out:
673
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
L
Linus Torvalds 已提交
674 675 676
	return status;
}

677 678
#if defined(CONFIG_NFS_V4_1)

679
static __be32 encode_sessionid(struct xdr_stream *xdr,
680 681
				 const struct nfs4_sessionid *sid)
{
682
	__be32 *p;
683

684
	p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
685 686 687
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);

688
	memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
689 690 691
	return 0;
}

692
static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
693 694 695
				       struct xdr_stream *xdr,
				       const struct cb_sequenceres *res)
{
696
	__be32 *p;
697
	__be32 status = res->csr_status;
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716

	if (unlikely(status != 0))
		goto out;

	encode_sessionid(xdr, &res->csr_sessionid);

	p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
	if (unlikely(p == NULL))
		return htonl(NFS4ERR_RESOURCE);

	*p++ = htonl(res->csr_sequenceid);
	*p++ = htonl(res->csr_slotid);
	*p++ = htonl(res->csr_highestslotid);
	*p++ = htonl(res->csr_target_highestslotid);
out:
	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
	return status;
}

717 718 719
static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
720 721 722 723 724 725 726 727
	if (op_nr == OP_CB_SEQUENCE) {
		if (nop != 0)
			return htonl(NFS4ERR_SEQUENCE_POS);
	} else {
		if (nop == 0)
			return htonl(NFS4ERR_OP_NOT_IN_SESSION);
	}

728 729 730
	switch (op_nr) {
	case OP_CB_GETATTR:
	case OP_CB_RECALL:
731
	case OP_CB_SEQUENCE:
732
	case OP_CB_RECALL_ANY:
A
Andy Adamson 已提交
733
	case OP_CB_RECALL_SLOT:
F
Fred Isaman 已提交
734
	case OP_CB_LAYOUTRECALL:
M
Marc Eshel 已提交
735
	case OP_CB_NOTIFY_DEVICEID:
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
		*op = &callback_ops[op_nr];
		break;

	case OP_CB_NOTIFY:
	case OP_CB_PUSH_DELEG:
	case OP_CB_RECALLABLE_OBJ_AVAIL:
	case OP_CB_WANTS_CANCELLED:
	case OP_CB_NOTIFY_LOCK:
		return htonl(NFS4ERR_NOTSUPP);

	default:
		return htonl(NFS4ERR_OP_ILLEGAL);
	}

	return htonl(NFS_OK);
}

753 754 755 756 757 758 759 760 761
static void nfs4_callback_free_slot(struct nfs4_session *session)
{
	struct nfs4_slot_table *tbl = &session->bc_slot_table;

	spin_lock(&tbl->slot_tbl_lock);
	/*
	 * Let the state manager know callback processing done.
	 * A single slot, so highest used slotid is either 0 or -1
	 */
762
	tbl->highest_used_slotid = NFS4_NO_SLOT;
763
	nfs4_slot_tbl_drain_complete(tbl);
764 765 766
	spin_unlock(&tbl->slot_tbl_lock);
}

767
static void nfs4_cb_free_slot(struct cb_process_state *cps)
768
{
769
	if (cps->slotid != NFS4_NO_SLOT)
770
		nfs4_callback_free_slot(cps->clp->cl_session);
771 772
}

773 774 775 776 777 778 779 780
#else /* CONFIG_NFS_V4_1 */

static __be32
preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
{
	return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}

781
static void nfs4_cb_free_slot(struct cb_process_state *cps)
782 783
{
}
784 785
#endif /* CONFIG_NFS_V4_1 */

786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
#ifdef CONFIG_NFS_V4_2
static __be32
preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
{
	__be32 status = preprocess_nfs41_op(nop, op_nr, op);
	if (status != htonl(NFS4ERR_OP_ILLEGAL))
		return status;

	if (op_nr == OP_CB_OFFLOAD)
		return htonl(NFS4ERR_NOTSUPP);
	return htonl(NFS4ERR_OP_ILLEGAL);
}
#else /* CONFIG_NFS_V4_2 */
static __be32
preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
{
	return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
}
#endif /* CONFIG_NFS_V4_2 */

806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
static __be32
preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
{
	switch (op_nr) {
	case OP_CB_GETATTR:
	case OP_CB_RECALL:
		*op = &callback_ops[op_nr];
		break;
	default:
		return htonl(NFS4ERR_OP_ILLEGAL);
	}

	return htonl(NFS_OK);
}

821
static __be32 process_op(int nop, struct svc_rqst *rqstp,
L
Linus Torvalds 已提交
822
		struct xdr_stream *xdr_in, void *argp,
823 824
		struct xdr_stream *xdr_out, void *resp,
		struct cb_process_state *cps)
L
Linus Torvalds 已提交
825
{
826
	struct callback_op *op = &callback_ops[0];
827
	unsigned int op_nr;
828
	__be32 status;
L
Linus Torvalds 已提交
829
	long maxlen;
830
	__be32 res;
L
Linus Torvalds 已提交
831

832
	dprintk("%s: start\n", __func__);
L
Linus Torvalds 已提交
833
	status = decode_op_hdr(xdr_in, &op_nr);
834 835
	if (unlikely(status))
		return status;
L
Linus Torvalds 已提交
836

837
	dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
838
		__func__, cps->minorversion, nop, op_nr);
839

840 841 842 843 844 845 846 847 848 849 850 851 852
	switch (cps->minorversion) {
	case 0:
		status = preprocess_nfs4_op(op_nr, &op);
		break;
	case 1:
		status = preprocess_nfs41_op(nop, op_nr, &op);
		break;
	case 2:
		status = preprocess_nfs42_op(nop, op_nr, &op);
		break;
	default:
		status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
	}
853 854 855

	if (status == htonl(NFS4ERR_OP_ILLEGAL))
		op_nr = OP_CB_ILLEGAL;
856 857
	if (status)
		goto encode_hdr;
858

859 860
	if (cps->drc_status) {
		status = cps->drc_status;
861 862 863
		goto encode_hdr;
	}

L
Linus Torvalds 已提交
864 865
	maxlen = xdr_out->end - xdr_out->p;
	if (maxlen > 0 && maxlen < PAGE_SIZE) {
866 867
		status = op->decode_args(rqstp, xdr_in, argp);
		if (likely(status == 0))
868
			status = op->process_op(argp, resp, cps);
L
Linus Torvalds 已提交
869 870 871
	} else
		status = htonl(NFS4ERR_RESOURCE);

872
encode_hdr:
L
Linus Torvalds 已提交
873
	res = encode_op_hdr(xdr_out, op_nr, status);
874 875
	if (unlikely(res))
		return res;
L
Linus Torvalds 已提交
876 877
	if (op->encode_res != NULL && status == 0)
		status = op->encode_res(rqstp, xdr_out, resp);
878
	dprintk("%s: done, status = %d\n", __func__, ntohl(status));
L
Linus Torvalds 已提交
879 880 881 882 883 884
	return status;
}

/*
 * Decode, process and encode a COMPOUND
 */
A
Al Viro 已提交
885
static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
L
Linus Torvalds 已提交
886
{
887 888
	struct cb_compound_hdr_arg hdr_arg = { 0 };
	struct cb_compound_hdr_res hdr_res = { NULL };
L
Linus Torvalds 已提交
889
	struct xdr_stream xdr_in, xdr_out;
890 891 892 893
	__be32 *p, status;
	struct cb_process_state cps = {
		.drc_status = 0,
		.clp = NULL,
894
		.slotid = NFS4_NO_SLOT,
895
		.net = SVC_NET(rqstp),
896
	};
897
	unsigned int nops = 0;
L
Linus Torvalds 已提交
898

899
	dprintk("%s: start\n", __func__);
L
Linus Torvalds 已提交
900 901 902

	xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);

903
	p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
L
Linus Torvalds 已提交
904 905
	xdr_init_encode(&xdr_out, &rqstp->rq_res, p);

906
	status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
907
	if (status == htonl(NFS4ERR_RESOURCE))
908 909
		return rpc_garbage_args;

910
	if (hdr_arg.minorversion == 0) {
911
		cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
912
		if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
913
			return rpc_drop_reply;
914
	}
915

916
	cps.minorversion = hdr_arg.minorversion;
L
Linus Torvalds 已提交
917 918
	hdr_res.taglen = hdr_arg.taglen;
	hdr_res.tag = hdr_arg.tag;
919 920
	if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
		return rpc_system_err;
L
Linus Torvalds 已提交
921

922
	while (status == 0 && nops != hdr_arg.nops) {
923 924
		status = process_op(nops, rqstp, &xdr_in,
				    argp, &xdr_out, resp, &cps);
L
Linus Torvalds 已提交
925 926
		nops++;
	}
927

928 929 930 931 932 933 934
	/* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
	* resource error in cb_compound status without returning op */
	if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
		status = htonl(NFS4ERR_RESOURCE);
		nops--;
	}

L
Linus Torvalds 已提交
935 936
	*hdr_res.status = status;
	*hdr_res.nops = htonl(nops);
937
	nfs4_cb_free_slot(&cps);
938
	nfs_put_client(cps.clp);
939
	dprintk("%s: done, status = %u\n", __func__, ntohl(status));
L
Linus Torvalds 已提交
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
	return rpc_success;
}

/*
 * Define NFS4 callback COMPOUND ops.
 */
static struct callback_op callback_ops[] = {
	[0] = {
		.res_maxsize = CB_OP_HDR_RES_MAXSZ,
	},
	[OP_CB_GETATTR] = {
		.process_op = (callback_process_op_t)nfs4_callback_getattr,
		.decode_args = (callback_decode_arg_t)decode_getattr_args,
		.encode_res = (callback_encode_res_t)encode_getattr_res,
		.res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
	},
	[OP_CB_RECALL] = {
		.process_op = (callback_process_op_t)nfs4_callback_recall,
		.decode_args = (callback_decode_arg_t)decode_recall_args,
		.res_maxsize = CB_OP_RECALL_RES_MAXSZ,
960 961
	},
#if defined(CONFIG_NFS_V4_1)
F
Fred Isaman 已提交
962 963 964 965 966 967
	[OP_CB_LAYOUTRECALL] = {
		.process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
		.decode_args =
			(callback_decode_arg_t)decode_layoutrecall_args,
		.res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
	},
M
Marc Eshel 已提交
968 969 970 971 972 973
	[OP_CB_NOTIFY_DEVICEID] = {
		.process_op = (callback_process_op_t)nfs4_callback_devicenotify,
		.decode_args =
			(callback_decode_arg_t)decode_devicenotify_args,
		.res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
	},
974 975 976 977 978 979
	[OP_CB_SEQUENCE] = {
		.process_op = (callback_process_op_t)nfs4_callback_sequence,
		.decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
		.encode_res = (callback_encode_res_t)encode_cb_sequence_res,
		.res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
	},
980 981 982 983 984
	[OP_CB_RECALL_ANY] = {
		.process_op = (callback_process_op_t)nfs4_callback_recallany,
		.decode_args = (callback_decode_arg_t)decode_recallany_args,
		.res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
	},
A
Andy Adamson 已提交
985 986 987 988 989
	[OP_CB_RECALL_SLOT] = {
		.process_op = (callback_process_op_t)nfs4_callback_recallslot,
		.decode_args = (callback_decode_arg_t)decode_recallslot_args,
		.res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
	},
990
#endif /* CONFIG_NFS_V4_1 */
L
Linus Torvalds 已提交
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
};

/*
 * Define NFS4 callback procedures
 */
static struct svc_procedure nfs4_callback_procedures1[] = {
	[CB_NULL] = {
		.pc_func = nfs4_callback_null,
		.pc_decode = (kxdrproc_t)nfs4_decode_void,
		.pc_encode = (kxdrproc_t)nfs4_encode_void,
		.pc_xdrressize = 1,
	},
	[CB_COMPOUND] = {
		.pc_func = nfs4_callback_compound,
		.pc_encode = (kxdrproc_t)nfs4_encode_void,
		.pc_argsize = 256,
		.pc_ressize = 256,
		.pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
	}
};

struct svc_version nfs4_callback_version1 = {
	.vs_vers = 1,
	.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
	.vs_proc = nfs4_callback_procedures1,
	.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
	.vs_dispatch = NULL,
1018
	.vs_hidden = 1,
L
Linus Torvalds 已提交
1019 1020
};

1021 1022 1023 1024 1025 1026
struct svc_version nfs4_callback_version4 = {
	.vs_vers = 4,
	.vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
	.vs_proc = nfs4_callback_procedures1,
	.vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
	.vs_dispatch = NULL,
1027
	.vs_hidden = 1,
1028
};