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Avoid reading past buffer when calling GETACL
[zen-stable.git] / fs / nfs / callback_xdr.c
blob2b2d33b33d0cc920cfbe9483337c9fce0d7f8aee
1 /*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
8 #include <linux/kernel.h>
9 #include <linux/sunrpc/svc.h>
10 #include <linux/nfs4.h>
11 #include <linux/nfs_fs.h>
12 #include <linux/ratelimit.h>
13 #include <linux/printk.h>
14 #include <linux/slab.h>
15 #include <linux/sunrpc/bc_xprt.h>
16 #include "nfs4_fs.h"
17 #include "callback.h"
18 #include "internal.h"
19
20 #define CB_OP_TAGLEN_MAXSZ (512)
21 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
22 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
23 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
24 CB_OP_GETATTR_BITMAP_MAXSZ + \
25 2 + 2 + 3 + 3)
26 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
27
28 #if defined(CONFIG_NFS_V4_1)
29 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
32 4 + 1 + 3)
33 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #endif /* CONFIG_NFS_V4_1 */
36
37 #define NFSDBG_FACILITY NFSDBG_CALLBACK
38
39 /* Internal error code */
40 #define NFS4ERR_RESOURCE_HDR 11050
41
42 typedef __be32 (*callback_process_op_t)(void *, void *,
43 struct cb_process_state *);
44 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
45 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
46
47
48 struct callback_op {
49 callback_process_op_t process_op;
50 callback_decode_arg_t decode_args;
51 callback_encode_res_t encode_res;
52 long res_maxsize;
53 };
54
55 static struct callback_op callback_ops[];
56
57 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
58 {
59 return htonl(NFS4_OK);
60 }
61
62 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
63 {
64 return xdr_argsize_check(rqstp, p);
65 }
66
67 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
68 {
69 return xdr_ressize_check(rqstp, p);
70 }
71
72 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
73 {
74 __be32 *p;
75
76 p = xdr_inline_decode(xdr, nbytes);
77 if (unlikely(p == NULL))
78 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
79 return p;
80 }
81
82 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
83 {
84 __be32 *p;
85
86 p = read_buf(xdr, 4);
87 if (unlikely(p == NULL))
88 return htonl(NFS4ERR_RESOURCE);
89 *len = ntohl(*p);
90
91 if (*len != 0) {
92 p = read_buf(xdr, *len);
93 if (unlikely(p == NULL))
94 return htonl(NFS4ERR_RESOURCE);
95 *str = (const char *)p;
96 } else
97 *str = NULL;
98
99 return 0;
100 }
101
102 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
103 {
104 __be32 *p;
105
106 p = read_buf(xdr, 4);
107 if (unlikely(p == NULL))
108 return htonl(NFS4ERR_RESOURCE);
109 fh->size = ntohl(*p);
110 if (fh->size > NFS4_FHSIZE)
111 return htonl(NFS4ERR_BADHANDLE);
112 p = read_buf(xdr, fh->size);
113 if (unlikely(p == NULL))
114 return htonl(NFS4ERR_RESOURCE);
115 memcpy(&fh->data[0], p, fh->size);
116 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
117 return 0;
118 }
119
120 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
121 {
122 __be32 *p;
123 unsigned int attrlen;
124
125 p = read_buf(xdr, 4);
126 if (unlikely(p == NULL))
127 return htonl(NFS4ERR_RESOURCE);
128 attrlen = ntohl(*p);
129 p = read_buf(xdr, attrlen << 2);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 if (likely(attrlen > 0))
133 bitmap[0] = ntohl(*p++);
134 if (attrlen > 1)
135 bitmap[1] = ntohl(*p);
136 return 0;
137 }
138
139 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
140 {
141 __be32 *p;
142
143 p = read_buf(xdr, 16);
144 if (unlikely(p == NULL))
145 return htonl(NFS4ERR_RESOURCE);
146 memcpy(stateid->data, p, 16);
147 return 0;
148 }
149
150 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
151 {
152 __be32 *p;
153 __be32 status;
154
155 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
156 if (unlikely(status != 0))
157 return status;
158 /* We do not like overly long tags! */
159 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
160 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
161 __func__, hdr->taglen);
162 return htonl(NFS4ERR_RESOURCE);
163 }
164 p = read_buf(xdr, 12);
165 if (unlikely(p == NULL))
166 return htonl(NFS4ERR_RESOURCE);
167 hdr->minorversion = ntohl(*p++);
168 /* Check minor version is zero or one. */
169 if (hdr->minorversion <= 1) {
170 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
171 } else {
172 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
173 "illegal minor version %u!\n",
174 __func__, hdr->minorversion);
175 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
176 }
177 hdr->nops = ntohl(*p);
178 dprintk("%s: minorversion %d nops %d\n", __func__,
179 hdr->minorversion, hdr->nops);
180 return 0;
181 }
182
183 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
184 {
185 __be32 *p;
186 p = read_buf(xdr, 4);
187 if (unlikely(p == NULL))
188 return htonl(NFS4ERR_RESOURCE_HDR);
189 *op = ntohl(*p);
190 return 0;
191 }
192
193 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
194 {
195 __be32 status;
196
197 status = decode_fh(xdr, &args->fh);
198 if (unlikely(status != 0))
199 goto out;
200 args->addr = svc_addr(rqstp);
201 status = decode_bitmap(xdr, args->bitmap);
202 out:
203 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
204 return status;
205 }
206
207 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
208 {
209 __be32 *p;
210 __be32 status;
211
212 args->addr = svc_addr(rqstp);
213 status = decode_stateid(xdr, &args->stateid);
214 if (unlikely(status != 0))
215 goto out;
216 p = read_buf(xdr, 4);
217 if (unlikely(p == NULL)) {
218 status = htonl(NFS4ERR_RESOURCE);
219 goto out;
220 }
221 args->truncate = ntohl(*p);
222 status = decode_fh(xdr, &args->fh);
223 out:
224 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
225 return status;
226 }
227
228 #if defined(CONFIG_NFS_V4_1)
229
230 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
231 struct xdr_stream *xdr,
232 struct cb_layoutrecallargs *args)
233 {
234 __be32 *p;
235 __be32 status = 0;
236 uint32_t iomode;
237
238 args->cbl_addr = svc_addr(rqstp);
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,
247 * as it is unusable and ignored with the other types.
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);
285 out:
286 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
287 return status;
288 }
289
290 static
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;
310 if (n > ULONG_MAX / sizeof(*args->devs)) {
311 status = htonl(NFS4ERR_BADXDR);
312 goto out;
313 }
314
315 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
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 }
372 out:
373 dprintk("%s: status %d ndevs %d\n",
374 __func__, ntohl(status), args->ndevs);
375 return status;
376 err:
377 kfree(args->devs);
378 goto out;
379 }
380
381 static __be32 decode_sessionid(struct xdr_stream *xdr,
382 struct nfs4_sessionid *sid)
383 {
384 __be32 *p;
385 int len = NFS4_MAX_SESSIONID_LEN;
386
387 p = read_buf(xdr, len);
388 if (unlikely(p == NULL))
389 return htonl(NFS4ERR_RESOURCE);
390
391 memcpy(sid->data, p, len);
392 return 0;
393 }
394
395 static __be32 decode_rc_list(struct xdr_stream *xdr,
396 struct referring_call_list *rc_list)
397 {
398 __be32 *p;
399 int i;
400 __be32 status;
401
402 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
403 if (status)
404 goto out;
405
406 status = htonl(NFS4ERR_RESOURCE);
407 p = read_buf(xdr, sizeof(uint32_t));
408 if (unlikely(p == NULL))
409 goto out;
410
411 rc_list->rcl_nrefcalls = ntohl(*p++);
412 if (rc_list->rcl_nrefcalls) {
413 p = read_buf(xdr,
414 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
415 if (unlikely(p == NULL))
416 goto out;
417 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
418 sizeof(*rc_list->rcl_refcalls),
419 GFP_KERNEL);
420 if (unlikely(rc_list->rcl_refcalls == NULL))
421 goto out;
422 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
423 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
424 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
425 }
426 }
427 status = 0;
428
429 out:
430 return status;
431 }
432
433 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
434 struct xdr_stream *xdr,
435 struct cb_sequenceargs *args)
436 {
437 __be32 *p;
438 int i;
439 __be32 status;
440
441 status = decode_sessionid(xdr, &args->csa_sessionid);
442 if (status)
443 goto out;
444
445 status = htonl(NFS4ERR_RESOURCE);
446 p = read_buf(xdr, 5 * sizeof(uint32_t));
447 if (unlikely(p == NULL))
448 goto out;
449
450 args->csa_addr = svc_addr(rqstp);
451 args->csa_sequenceid = ntohl(*p++);
452 args->csa_slotid = ntohl(*p++);
453 args->csa_highestslotid = ntohl(*p++);
454 args->csa_cachethis = ntohl(*p++);
455 args->csa_nrclists = ntohl(*p++);
456 args->csa_rclists = NULL;
457 if (args->csa_nrclists) {
458 args->csa_rclists = kmalloc(args->csa_nrclists *
459 sizeof(*args->csa_rclists),
460 GFP_KERNEL);
461 if (unlikely(args->csa_rclists == NULL))
462 goto out;
463
464 for (i = 0; i < args->csa_nrclists; i++) {
465 status = decode_rc_list(xdr, &args->csa_rclists[i]);
466 if (status)
467 goto out_free;
468 }
469 }
470 status = 0;
471
472 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
473 "highestslotid %u cachethis %d nrclists %u\n",
474 __func__,
475 ((u32 *)&args->csa_sessionid)[0],
476 ((u32 *)&args->csa_sessionid)[1],
477 ((u32 *)&args->csa_sessionid)[2],
478 ((u32 *)&args->csa_sessionid)[3],
479 args->csa_sequenceid, args->csa_slotid,
480 args->csa_highestslotid, args->csa_cachethis,
481 args->csa_nrclists);
482 out:
483 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
484 return status;
485
486 out_free:
487 for (i = 0; i < args->csa_nrclists; i++)
488 kfree(args->csa_rclists[i].rcl_refcalls);
489 kfree(args->csa_rclists);
490 goto out;
491 }
492
493 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
494 struct xdr_stream *xdr,
495 struct cb_recallanyargs *args)
496 {
497 uint32_t bitmap[2];
498 __be32 *p, status;
499
500 args->craa_addr = svc_addr(rqstp);
501 p = read_buf(xdr, 4);
502 if (unlikely(p == NULL))
503 return htonl(NFS4ERR_BADXDR);
504 args->craa_objs_to_keep = ntohl(*p++);
505 status = decode_bitmap(xdr, bitmap);
506 if (unlikely(status))
507 return status;
508 args->craa_type_mask = bitmap[0];
509
510 return 0;
511 }
512
513 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
514 struct xdr_stream *xdr,
515 struct cb_recallslotargs *args)
516 {
517 __be32 *p;
518
519 args->crsa_addr = svc_addr(rqstp);
520 p = read_buf(xdr, 4);
521 if (unlikely(p == NULL))
522 return htonl(NFS4ERR_BADXDR);
523 args->crsa_target_max_slots = ntohl(*p++);
524 return 0;
525 }
526
527 #endif /* CONFIG_NFS_V4_1 */
528
529 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
530 {
531 __be32 *p;
532
533 p = xdr_reserve_space(xdr, 4 + len);
534 if (unlikely(p == NULL))
535 return htonl(NFS4ERR_RESOURCE);
536 xdr_encode_opaque(p, str, len);
537 return 0;
538 }
539
540 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
541 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
542 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
543 {
544 __be32 bm[2];
545 __be32 *p;
546
547 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
548 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
549 if (bm[1] != 0) {
550 p = xdr_reserve_space(xdr, 16);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_RESOURCE);
553 *p++ = htonl(2);
554 *p++ = bm[0];
555 *p++ = bm[1];
556 } else if (bm[0] != 0) {
557 p = xdr_reserve_space(xdr, 12);
558 if (unlikely(p == NULL))
559 return htonl(NFS4ERR_RESOURCE);
560 *p++ = htonl(1);
561 *p++ = bm[0];
562 } else {
563 p = xdr_reserve_space(xdr, 8);
564 if (unlikely(p == NULL))
565 return htonl(NFS4ERR_RESOURCE);
566 *p++ = htonl(0);
567 }
568 *savep = p;
569 return 0;
570 }
571
572 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
573 {
574 __be32 *p;
575
576 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
577 return 0;
578 p = xdr_reserve_space(xdr, 8);
579 if (unlikely(!p))
580 return htonl(NFS4ERR_RESOURCE);
581 p = xdr_encode_hyper(p, change);
582 return 0;
583 }
584
585 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
586 {
587 __be32 *p;
588
589 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
590 return 0;
591 p = xdr_reserve_space(xdr, 8);
592 if (unlikely(!p))
593 return htonl(NFS4ERR_RESOURCE);
594 p = xdr_encode_hyper(p, size);
595 return 0;
596 }
597
598 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
599 {
600 __be32 *p;
601
602 p = xdr_reserve_space(xdr, 12);
603 if (unlikely(!p))
604 return htonl(NFS4ERR_RESOURCE);
605 p = xdr_encode_hyper(p, time->tv_sec);
606 *p = htonl(time->tv_nsec);
607 return 0;
608 }
609
610 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
611 {
612 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
613 return 0;
614 return encode_attr_time(xdr,time);
615 }
616
617 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
618 {
619 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
620 return 0;
621 return encode_attr_time(xdr,time);
622 }
623
624 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
625 {
626 __be32 status;
627
628 hdr->status = xdr_reserve_space(xdr, 4);
629 if (unlikely(hdr->status == NULL))
630 return htonl(NFS4ERR_RESOURCE);
631 status = encode_string(xdr, hdr->taglen, hdr->tag);
632 if (unlikely(status != 0))
633 return status;
634 hdr->nops = xdr_reserve_space(xdr, 4);
635 if (unlikely(hdr->nops == NULL))
636 return htonl(NFS4ERR_RESOURCE);
637 return 0;
638 }
639
640 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
641 {
642 __be32 *p;
643
644 p = xdr_reserve_space(xdr, 8);
645 if (unlikely(p == NULL))
646 return htonl(NFS4ERR_RESOURCE_HDR);
647 *p++ = htonl(op);
648 *p = res;
649 return 0;
650 }
651
652 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
653 {
654 __be32 *savep = NULL;
655 __be32 status = res->status;
656
657 if (unlikely(status != 0))
658 goto out;
659 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
660 if (unlikely(status != 0))
661 goto out;
662 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
663 if (unlikely(status != 0))
664 goto out;
665 status = encode_attr_size(xdr, res->bitmap, res->size);
666 if (unlikely(status != 0))
667 goto out;
668 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
669 if (unlikely(status != 0))
670 goto out;
671 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
672 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
673 out:
674 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
675 return status;
676 }
677
678 #if defined(CONFIG_NFS_V4_1)
679
680 static __be32 encode_sessionid(struct xdr_stream *xdr,
681 const struct nfs4_sessionid *sid)
682 {
683 __be32 *p;
684 int len = NFS4_MAX_SESSIONID_LEN;
685
686 p = xdr_reserve_space(xdr, len);
687 if (unlikely(p == NULL))
688 return htonl(NFS4ERR_RESOURCE);
689
690 memcpy(p, sid, len);
691 return 0;
692 }
693
694 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
695 struct xdr_stream *xdr,
696 const struct cb_sequenceres *res)
697 {
698 __be32 *p;
699 unsigned status = res->csr_status;
700
701 if (unlikely(status != 0))
702 goto out;
703
704 encode_sessionid(xdr, &res->csr_sessionid);
705
706 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
707 if (unlikely(p == NULL))
708 return htonl(NFS4ERR_RESOURCE);
709
710 *p++ = htonl(res->csr_sequenceid);
711 *p++ = htonl(res->csr_slotid);
712 *p++ = htonl(res->csr_highestslotid);
713 *p++ = htonl(res->csr_target_highestslotid);
714 out:
715 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
716 return status;
717 }
718
719 static __be32
720 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
721 {
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
730 switch (op_nr) {
731 case OP_CB_GETATTR:
732 case OP_CB_RECALL:
733 case OP_CB_SEQUENCE:
734 case OP_CB_RECALL_ANY:
735 case OP_CB_RECALL_SLOT:
736 case OP_CB_LAYOUTRECALL:
737 case OP_CB_NOTIFY_DEVICEID:
738 *op = &callback_ops[op_nr];
739 break;
740
741 case OP_CB_NOTIFY:
742 case OP_CB_PUSH_DELEG:
743 case OP_CB_RECALLABLE_OBJ_AVAIL:
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
755 static void nfs4_callback_free_slot(struct nfs4_session *session)
756 {
757 struct nfs4_slot_table *tbl = &session->bc_slot_table;
758
759 spin_lock(&tbl->slot_tbl_lock);
760 /*
761 * Let the state manager know callback processing done.
762 * A single slot, so highest used slotid is either 0 or -1
763 */
764 tbl->highest_used_slotid = -1;
765 nfs4_check_drain_bc_complete(session);
766 spin_unlock(&tbl->slot_tbl_lock);
767 }
768
769 static void nfs4_cb_free_slot(struct cb_process_state *cps)
770 {
771 if (cps->slotid != -1)
772 nfs4_callback_free_slot(cps->clp->cl_session);
773 }
774
775 #else /* CONFIG_NFS_V4_1 */
776
777 static __be32
778 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
779 {
780 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
781 }
782
783 static void nfs4_cb_free_slot(struct cb_process_state *cps)
784 {
785 }
786 #endif /* CONFIG_NFS_V4_1 */
787
788 static __be32
789 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
790 {
791 switch (op_nr) {
792 case OP_CB_GETATTR:
793 case OP_CB_RECALL:
794 *op = &callback_ops[op_nr];
795 break;
796 default:
797 return htonl(NFS4ERR_OP_ILLEGAL);
798 }
799
800 return htonl(NFS_OK);
801 }
802
803 static __be32 process_op(uint32_t minorversion, int nop,
804 struct svc_rqst *rqstp,
805 struct xdr_stream *xdr_in, void *argp,
806 struct xdr_stream *xdr_out, void *resp,
807 struct cb_process_state *cps)
808 {
809 struct callback_op *op = &callback_ops[0];
810 unsigned int op_nr;
811 __be32 status;
812 long maxlen;
813 __be32 res;
814
815 dprintk("%s: start\n", __func__);
816 status = decode_op_hdr(xdr_in, &op_nr);
817 if (unlikely(status))
818 return status;
819
820 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
821 __func__, minorversion, nop, op_nr);
822
823 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
824 preprocess_nfs4_op(op_nr, &op);
825 if (status == htonl(NFS4ERR_OP_ILLEGAL))
826 op_nr = OP_CB_ILLEGAL;
827 if (status)
828 goto encode_hdr;
829
830 if (cps->drc_status) {
831 status = cps->drc_status;
832 goto encode_hdr;
833 }
834
835 maxlen = xdr_out->end - xdr_out->p;
836 if (maxlen > 0 && maxlen < PAGE_SIZE) {
837 status = op->decode_args(rqstp, xdr_in, argp);
838 if (likely(status == 0))
839 status = op->process_op(argp, resp, cps);
840 } else
841 status = htonl(NFS4ERR_RESOURCE);
842
843 encode_hdr:
844 res = encode_op_hdr(xdr_out, op_nr, status);
845 if (unlikely(res))
846 return res;
847 if (op->encode_res != NULL && status == 0)
848 status = op->encode_res(rqstp, xdr_out, resp);
849 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
850 return status;
851 }
852
853 /*
854 * Decode, process and encode a COMPOUND
855 */
856 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
857 {
858 struct cb_compound_hdr_arg hdr_arg = { 0 };
859 struct cb_compound_hdr_res hdr_res = { NULL };
860 struct xdr_stream xdr_in, xdr_out;
861 __be32 *p, status;
862 struct cb_process_state cps = {
863 .drc_status = 0,
864 .clp = NULL,
865 .slotid = -1,
866 };
867 unsigned int nops = 0;
868
869 dprintk("%s: start\n", __func__);
870
871 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
872
873 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
874 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
875
876 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
877 if (status == __constant_htonl(NFS4ERR_RESOURCE))
878 return rpc_garbage_args;
879
880 if (hdr_arg.minorversion == 0) {
881 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
882 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
883 return rpc_drop_reply;
884 }
885
886 hdr_res.taglen = hdr_arg.taglen;
887 hdr_res.tag = hdr_arg.tag;
888 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
889 return rpc_system_err;
890
891 while (status == 0 && nops != hdr_arg.nops) {
892 status = process_op(hdr_arg.minorversion, nops, rqstp,
893 &xdr_in, argp, &xdr_out, resp, &cps);
894 nops++;
895 }
896
897 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
898 * resource error in cb_compound status without returning op */
899 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
900 status = htonl(NFS4ERR_RESOURCE);
901 nops--;
902 }
903
904 *hdr_res.status = status;
905 *hdr_res.nops = htonl(nops);
906 nfs4_cb_free_slot(&cps);
907 nfs_put_client(cps.clp);
908 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
909 return rpc_success;
910 }
911
912 /*
913 * Define NFS4 callback COMPOUND ops.
914 */
915 static struct callback_op callback_ops[] = {
916 [0] = {
917 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
918 },
919 [OP_CB_GETATTR] = {
920 .process_op = (callback_process_op_t)nfs4_callback_getattr,
921 .decode_args = (callback_decode_arg_t)decode_getattr_args,
922 .encode_res = (callback_encode_res_t)encode_getattr_res,
923 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
924 },
925 [OP_CB_RECALL] = {
926 .process_op = (callback_process_op_t)nfs4_callback_recall,
927 .decode_args = (callback_decode_arg_t)decode_recall_args,
928 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
929 },
930 #if defined(CONFIG_NFS_V4_1)
931 [OP_CB_LAYOUTRECALL] = {
932 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
933 .decode_args =
934 (callback_decode_arg_t)decode_layoutrecall_args,
935 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
936 },
937 [OP_CB_NOTIFY_DEVICEID] = {
938 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
939 .decode_args =
940 (callback_decode_arg_t)decode_devicenotify_args,
941 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
942 },
943 [OP_CB_SEQUENCE] = {
944 .process_op = (callback_process_op_t)nfs4_callback_sequence,
945 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
946 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
947 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
948 },
949 [OP_CB_RECALL_ANY] = {
950 .process_op = (callback_process_op_t)nfs4_callback_recallany,
951 .decode_args = (callback_decode_arg_t)decode_recallany_args,
952 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
953 },
954 [OP_CB_RECALL_SLOT] = {
955 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
956 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
957 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
958 },
959 #endif /* CONFIG_NFS_V4_1 */
960 };
961
962 /*
963 * Define NFS4 callback procedures
964 */
965 static struct svc_procedure nfs4_callback_procedures1[] = {
966 [CB_NULL] = {
967 .pc_func = nfs4_callback_null,
968 .pc_decode = (kxdrproc_t)nfs4_decode_void,
969 .pc_encode = (kxdrproc_t)nfs4_encode_void,
970 .pc_xdrressize = 1,
971 },
972 [CB_COMPOUND] = {
973 .pc_func = nfs4_callback_compound,
974 .pc_encode = (kxdrproc_t)nfs4_encode_void,
975 .pc_argsize = 256,
976 .pc_ressize = 256,
977 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
978 }
979 };
980
981 struct svc_version nfs4_callback_version1 = {
982 .vs_vers = 1,
983 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
984 .vs_proc = nfs4_callback_procedures1,
985 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
986 .vs_dispatch = NULL,
987 .vs_hidden = 1,
988 };
989
990 struct svc_version nfs4_callback_version4 = {
991 .vs_vers = 4,
992 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
993 .vs_proc = nfs4_callback_procedures1,
994 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
995 .vs_dispatch = NULL,
996 .vs_hidden = 1,
997 };