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Linux 3.8-rc7
[cris-mirror.git] / fs / nfs / callback_xdr.c
blob59461c957d9d7ed7204e09f9fad1aa0b154d8486
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 #include "nfs4session.h"
20
21 #define CB_OP_TAGLEN_MAXSZ (512)
22 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
23 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
24 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 CB_OP_GETATTR_BITMAP_MAXSZ + \
26 2 + 2 + 3 + 3)
27 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28
29 #if defined(CONFIG_NFS_V4_1)
30 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
33 4 + 1 + 3)
34 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
36 #endif /* CONFIG_NFS_V4_1 */
37
38 #define NFSDBG_FACILITY NFSDBG_CALLBACK
39
40 /* Internal error code */
41 #define NFS4ERR_RESOURCE_HDR 11050
42
43 typedef __be32 (*callback_process_op_t)(void *, void *,
44 struct cb_process_state *);
45 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
46 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
47
48
49 struct callback_op {
50 callback_process_op_t process_op;
51 callback_decode_arg_t decode_args;
52 callback_encode_res_t encode_res;
53 long res_maxsize;
54 };
55
56 static struct callback_op callback_ops[];
57
58 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
59 {
60 return htonl(NFS4_OK);
61 }
62
63 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
64 {
65 return xdr_argsize_check(rqstp, p);
66 }
67
68 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
69 {
70 return xdr_ressize_check(rqstp, p);
71 }
72
73 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
74 {
75 __be32 *p;
76
77 p = xdr_inline_decode(xdr, nbytes);
78 if (unlikely(p == NULL))
79 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
80 return p;
81 }
82
83 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
84 {
85 __be32 *p;
86
87 p = read_buf(xdr, 4);
88 if (unlikely(p == NULL))
89 return htonl(NFS4ERR_RESOURCE);
90 *len = ntohl(*p);
91
92 if (*len != 0) {
93 p = read_buf(xdr, *len);
94 if (unlikely(p == NULL))
95 return htonl(NFS4ERR_RESOURCE);
96 *str = (const char *)p;
97 } else
98 *str = NULL;
99
100 return 0;
101 }
102
103 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
104 {
105 __be32 *p;
106
107 p = read_buf(xdr, 4);
108 if (unlikely(p == NULL))
109 return htonl(NFS4ERR_RESOURCE);
110 fh->size = ntohl(*p);
111 if (fh->size > NFS4_FHSIZE)
112 return htonl(NFS4ERR_BADHANDLE);
113 p = read_buf(xdr, fh->size);
114 if (unlikely(p == NULL))
115 return htonl(NFS4ERR_RESOURCE);
116 memcpy(&fh->data[0], p, fh->size);
117 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
118 return 0;
119 }
120
121 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
122 {
123 __be32 *p;
124 unsigned int attrlen;
125
126 p = read_buf(xdr, 4);
127 if (unlikely(p == NULL))
128 return htonl(NFS4ERR_RESOURCE);
129 attrlen = ntohl(*p);
130 p = read_buf(xdr, attrlen << 2);
131 if (unlikely(p == NULL))
132 return htonl(NFS4ERR_RESOURCE);
133 if (likely(attrlen > 0))
134 bitmap[0] = ntohl(*p++);
135 if (attrlen > 1)
136 bitmap[1] = ntohl(*p);
137 return 0;
138 }
139
140 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
141 {
142 __be32 *p;
143
144 p = read_buf(xdr, NFS4_STATEID_SIZE);
145 if (unlikely(p == NULL))
146 return htonl(NFS4ERR_RESOURCE);
147 memcpy(stateid, p, NFS4_STATEID_SIZE);
148 return 0;
149 }
150
151 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
152 {
153 __be32 *p;
154 __be32 status;
155
156 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
157 if (unlikely(status != 0))
158 return status;
159 /* We do not like overly long tags! */
160 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
161 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
162 __func__, hdr->taglen);
163 return htonl(NFS4ERR_RESOURCE);
164 }
165 p = read_buf(xdr, 12);
166 if (unlikely(p == NULL))
167 return htonl(NFS4ERR_RESOURCE);
168 hdr->minorversion = ntohl(*p++);
169 /* Check minor version is zero or one. */
170 if (hdr->minorversion <= 1) {
171 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
172 } else {
173 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
174 "illegal minor version %u!\n",
175 __func__, hdr->minorversion);
176 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
177 }
178 hdr->nops = ntohl(*p);
179 dprintk("%s: minorversion %d nops %d\n", __func__,
180 hdr->minorversion, hdr->nops);
181 return 0;
182 }
183
184 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
185 {
186 __be32 *p;
187 p = read_buf(xdr, 4);
188 if (unlikely(p == NULL))
189 return htonl(NFS4ERR_RESOURCE_HDR);
190 *op = ntohl(*p);
191 return 0;
192 }
193
194 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
195 {
196 __be32 status;
197
198 status = decode_fh(xdr, &args->fh);
199 if (unlikely(status != 0))
200 goto out;
201 args->addr = svc_addr(rqstp);
202 status = decode_bitmap(xdr, args->bitmap);
203 out:
204 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
205 return status;
206 }
207
208 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
209 {
210 __be32 *p;
211 __be32 status;
212
213 args->addr = svc_addr(rqstp);
214 status = decode_stateid(xdr, &args->stateid);
215 if (unlikely(status != 0))
216 goto out;
217 p = read_buf(xdr, 4);
218 if (unlikely(p == NULL)) {
219 status = htonl(NFS4ERR_RESOURCE);
220 goto out;
221 }
222 args->truncate = ntohl(*p);
223 status = decode_fh(xdr, &args->fh);
224 out:
225 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
226 return status;
227 }
228
229 #if defined(CONFIG_NFS_V4_1)
230
231 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
232 struct xdr_stream *xdr,
233 struct cb_layoutrecallargs *args)
234 {
235 __be32 *p;
236 __be32 status = 0;
237 uint32_t iomode;
238
239 args->cbl_addr = svc_addr(rqstp);
240 p = read_buf(xdr, 4 * sizeof(uint32_t));
241 if (unlikely(p == NULL)) {
242 status = htonl(NFS4ERR_BADXDR);
243 goto out;
244 }
245
246 args->cbl_layout_type = ntohl(*p++);
247 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
248 * as it is unusable and ignored with the other types.
249 */
250 iomode = ntohl(*p++);
251 args->cbl_layoutchanged = ntohl(*p++);
252 args->cbl_recall_type = ntohl(*p++);
253
254 if (args->cbl_recall_type == RETURN_FILE) {
255 args->cbl_range.iomode = iomode;
256 status = decode_fh(xdr, &args->cbl_fh);
257 if (unlikely(status != 0))
258 goto out;
259
260 p = read_buf(xdr, 2 * sizeof(uint64_t));
261 if (unlikely(p == NULL)) {
262 status = htonl(NFS4ERR_BADXDR);
263 goto out;
264 }
265 p = xdr_decode_hyper(p, &args->cbl_range.offset);
266 p = xdr_decode_hyper(p, &args->cbl_range.length);
267 status = decode_stateid(xdr, &args->cbl_stateid);
268 if (unlikely(status != 0))
269 goto out;
270 } else if (args->cbl_recall_type == RETURN_FSID) {
271 p = read_buf(xdr, 2 * sizeof(uint64_t));
272 if (unlikely(p == NULL)) {
273 status = htonl(NFS4ERR_BADXDR);
274 goto out;
275 }
276 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
277 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
278 } else if (args->cbl_recall_type != RETURN_ALL) {
279 status = htonl(NFS4ERR_BADXDR);
280 goto out;
281 }
282 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
283 __func__,
284 args->cbl_layout_type, iomode,
285 args->cbl_layoutchanged, args->cbl_recall_type);
286 out:
287 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
288 return status;
289 }
290
291 static
292 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
293 struct xdr_stream *xdr,
294 struct cb_devicenotifyargs *args)
295 {
296 __be32 *p;
297 __be32 status = 0;
298 u32 tmp;
299 int n, i;
300 args->ndevs = 0;
301
302 /* Num of device notifications */
303 p = read_buf(xdr, sizeof(uint32_t));
304 if (unlikely(p == NULL)) {
305 status = htonl(NFS4ERR_BADXDR);
306 goto out;
307 }
308 n = ntohl(*p++);
309 if (n <= 0)
310 goto out;
311 if (n > ULONG_MAX / sizeof(*args->devs)) {
312 status = htonl(NFS4ERR_BADXDR);
313 goto out;
314 }
315
316 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
317 if (!args->devs) {
318 status = htonl(NFS4ERR_DELAY);
319 goto out;
320 }
321
322 /* Decode each dev notification */
323 for (i = 0; i < n; i++) {
324 struct cb_devicenotifyitem *dev = &args->devs[i];
325
326 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
327 if (unlikely(p == NULL)) {
328 status = htonl(NFS4ERR_BADXDR);
329 goto err;
330 }
331
332 tmp = ntohl(*p++); /* bitmap size */
333 if (tmp != 1) {
334 status = htonl(NFS4ERR_INVAL);
335 goto err;
336 }
337 dev->cbd_notify_type = ntohl(*p++);
338 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
339 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
340 status = htonl(NFS4ERR_INVAL);
341 goto err;
342 }
343
344 tmp = ntohl(*p++); /* opaque size */
345 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
346 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
347 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
348 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
349 status = htonl(NFS4ERR_INVAL);
350 goto err;
351 }
352 dev->cbd_layout_type = ntohl(*p++);
353 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
354 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
355
356 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
357 p = read_buf(xdr, sizeof(uint32_t));
358 if (unlikely(p == NULL)) {
359 status = htonl(NFS4ERR_BADXDR);
360 goto err;
361 }
362 dev->cbd_immediate = ntohl(*p++);
363 } else {
364 dev->cbd_immediate = 0;
365 }
366
367 args->ndevs++;
368
369 dprintk("%s: type %d layout 0x%x immediate %d\n",
370 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
371 dev->cbd_immediate);
372 }
373 out:
374 dprintk("%s: status %d ndevs %d\n",
375 __func__, ntohl(status), args->ndevs);
376 return status;
377 err:
378 kfree(args->devs);
379 goto out;
380 }
381
382 static __be32 decode_sessionid(struct xdr_stream *xdr,
383 struct nfs4_sessionid *sid)
384 {
385 __be32 *p;
386 int len = NFS4_MAX_SESSIONID_LEN;
387
388 p = read_buf(xdr, len);
389 if (unlikely(p == NULL))
390 return htonl(NFS4ERR_RESOURCE);
391
392 memcpy(sid->data, p, len);
393 return 0;
394 }
395
396 static __be32 decode_rc_list(struct xdr_stream *xdr,
397 struct referring_call_list *rc_list)
398 {
399 __be32 *p;
400 int i;
401 __be32 status;
402
403 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
404 if (status)
405 goto out;
406
407 status = htonl(NFS4ERR_RESOURCE);
408 p = read_buf(xdr, sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 goto out;
411
412 rc_list->rcl_nrefcalls = ntohl(*p++);
413 if (rc_list->rcl_nrefcalls) {
414 p = read_buf(xdr,
415 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
416 if (unlikely(p == NULL))
417 goto out;
418 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
419 sizeof(*rc_list->rcl_refcalls),
420 GFP_KERNEL);
421 if (unlikely(rc_list->rcl_refcalls == NULL))
422 goto out;
423 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
424 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
425 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
426 }
427 }
428 status = 0;
429
430 out:
431 return status;
432 }
433
434 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
435 struct xdr_stream *xdr,
436 struct cb_sequenceargs *args)
437 {
438 __be32 *p;
439 int i;
440 __be32 status;
441
442 status = decode_sessionid(xdr, &args->csa_sessionid);
443 if (status)
444 goto out;
445
446 status = htonl(NFS4ERR_RESOURCE);
447 p = read_buf(xdr, 5 * sizeof(uint32_t));
448 if (unlikely(p == NULL))
449 goto out;
450
451 args->csa_addr = svc_addr(rqstp);
452 args->csa_sequenceid = ntohl(*p++);
453 args->csa_slotid = ntohl(*p++);
454 args->csa_highestslotid = ntohl(*p++);
455 args->csa_cachethis = ntohl(*p++);
456 args->csa_nrclists = ntohl(*p++);
457 args->csa_rclists = NULL;
458 if (args->csa_nrclists) {
459 args->csa_rclists = kmalloc_array(args->csa_nrclists,
460 sizeof(*args->csa_rclists),
461 GFP_KERNEL);
462 if (unlikely(args->csa_rclists == NULL))
463 goto out;
464
465 for (i = 0; i < args->csa_nrclists; i++) {
466 status = decode_rc_list(xdr, &args->csa_rclists[i]);
467 if (status)
468 goto out_free;
469 }
470 }
471 status = 0;
472
473 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
474 "highestslotid %u cachethis %d nrclists %u\n",
475 __func__,
476 ((u32 *)&args->csa_sessionid)[0],
477 ((u32 *)&args->csa_sessionid)[1],
478 ((u32 *)&args->csa_sessionid)[2],
479 ((u32 *)&args->csa_sessionid)[3],
480 args->csa_sequenceid, args->csa_slotid,
481 args->csa_highestslotid, args->csa_cachethis,
482 args->csa_nrclists);
483 out:
484 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
485 return status;
486
487 out_free:
488 for (i = 0; i < args->csa_nrclists; i++)
489 kfree(args->csa_rclists[i].rcl_refcalls);
490 kfree(args->csa_rclists);
491 goto out;
492 }
493
494 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
495 struct xdr_stream *xdr,
496 struct cb_recallanyargs *args)
497 {
498 uint32_t bitmap[2];
499 __be32 *p, status;
500
501 args->craa_addr = svc_addr(rqstp);
502 p = read_buf(xdr, 4);
503 if (unlikely(p == NULL))
504 return htonl(NFS4ERR_BADXDR);
505 args->craa_objs_to_keep = ntohl(*p++);
506 status = decode_bitmap(xdr, bitmap);
507 if (unlikely(status))
508 return status;
509 args->craa_type_mask = bitmap[0];
510
511 return 0;
512 }
513
514 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
515 struct xdr_stream *xdr,
516 struct cb_recallslotargs *args)
517 {
518 __be32 *p;
519
520 args->crsa_addr = svc_addr(rqstp);
521 p = read_buf(xdr, 4);
522 if (unlikely(p == NULL))
523 return htonl(NFS4ERR_BADXDR);
524 args->crsa_target_highest_slotid = ntohl(*p++);
525 return 0;
526 }
527
528 #endif /* CONFIG_NFS_V4_1 */
529
530 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
531 {
532 __be32 *p;
533
534 p = xdr_reserve_space(xdr, 4 + len);
535 if (unlikely(p == NULL))
536 return htonl(NFS4ERR_RESOURCE);
537 xdr_encode_opaque(p, str, len);
538 return 0;
539 }
540
541 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
542 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
543 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
544 {
545 __be32 bm[2];
546 __be32 *p;
547
548 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
549 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
550 if (bm[1] != 0) {
551 p = xdr_reserve_space(xdr, 16);
552 if (unlikely(p == NULL))
553 return htonl(NFS4ERR_RESOURCE);
554 *p++ = htonl(2);
555 *p++ = bm[0];
556 *p++ = bm[1];
557 } else if (bm[0] != 0) {
558 p = xdr_reserve_space(xdr, 12);
559 if (unlikely(p == NULL))
560 return htonl(NFS4ERR_RESOURCE);
561 *p++ = htonl(1);
562 *p++ = bm[0];
563 } else {
564 p = xdr_reserve_space(xdr, 8);
565 if (unlikely(p == NULL))
566 return htonl(NFS4ERR_RESOURCE);
567 *p++ = htonl(0);
568 }
569 *savep = p;
570 return 0;
571 }
572
573 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
574 {
575 __be32 *p;
576
577 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
578 return 0;
579 p = xdr_reserve_space(xdr, 8);
580 if (unlikely(!p))
581 return htonl(NFS4ERR_RESOURCE);
582 p = xdr_encode_hyper(p, change);
583 return 0;
584 }
585
586 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
587 {
588 __be32 *p;
589
590 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
591 return 0;
592 p = xdr_reserve_space(xdr, 8);
593 if (unlikely(!p))
594 return htonl(NFS4ERR_RESOURCE);
595 p = xdr_encode_hyper(p, size);
596 return 0;
597 }
598
599 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
600 {
601 __be32 *p;
602
603 p = xdr_reserve_space(xdr, 12);
604 if (unlikely(!p))
605 return htonl(NFS4ERR_RESOURCE);
606 p = xdr_encode_hyper(p, time->tv_sec);
607 *p = htonl(time->tv_nsec);
608 return 0;
609 }
610
611 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
612 {
613 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
614 return 0;
615 return encode_attr_time(xdr,time);
616 }
617
618 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
619 {
620 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
621 return 0;
622 return encode_attr_time(xdr,time);
623 }
624
625 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
626 {
627 __be32 status;
628
629 hdr->status = xdr_reserve_space(xdr, 4);
630 if (unlikely(hdr->status == NULL))
631 return htonl(NFS4ERR_RESOURCE);
632 status = encode_string(xdr, hdr->taglen, hdr->tag);
633 if (unlikely(status != 0))
634 return status;
635 hdr->nops = xdr_reserve_space(xdr, 4);
636 if (unlikely(hdr->nops == NULL))
637 return htonl(NFS4ERR_RESOURCE);
638 return 0;
639 }
640
641 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
642 {
643 __be32 *p;
644
645 p = xdr_reserve_space(xdr, 8);
646 if (unlikely(p == NULL))
647 return htonl(NFS4ERR_RESOURCE_HDR);
648 *p++ = htonl(op);
649 *p = res;
650 return 0;
651 }
652
653 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
654 {
655 __be32 *savep = NULL;
656 __be32 status = res->status;
657
658 if (unlikely(status != 0))
659 goto out;
660 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
661 if (unlikely(status != 0))
662 goto out;
663 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
664 if (unlikely(status != 0))
665 goto out;
666 status = encode_attr_size(xdr, res->bitmap, res->size);
667 if (unlikely(status != 0))
668 goto out;
669 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
670 if (unlikely(status != 0))
671 goto out;
672 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
673 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
674 out:
675 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
676 return status;
677 }
678
679 #if defined(CONFIG_NFS_V4_1)
680
681 static __be32 encode_sessionid(struct xdr_stream *xdr,
682 const struct nfs4_sessionid *sid)
683 {
684 __be32 *p;
685 int len = NFS4_MAX_SESSIONID_LEN;
686
687 p = xdr_reserve_space(xdr, len);
688 if (unlikely(p == NULL))
689 return htonl(NFS4ERR_RESOURCE);
690
691 memcpy(p, sid, len);
692 return 0;
693 }
694
695 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
696 struct xdr_stream *xdr,
697 const struct cb_sequenceres *res)
698 {
699 __be32 *p;
700 __be32 status = res->csr_status;
701
702 if (unlikely(status != 0))
703 goto out;
704
705 encode_sessionid(xdr, &res->csr_sessionid);
706
707 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
708 if (unlikely(p == NULL))
709 return htonl(NFS4ERR_RESOURCE);
710
711 *p++ = htonl(res->csr_sequenceid);
712 *p++ = htonl(res->csr_slotid);
713 *p++ = htonl(res->csr_highestslotid);
714 *p++ = htonl(res->csr_target_highestslotid);
715 out:
716 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
717 return status;
718 }
719
720 static __be32
721 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
722 {
723 if (op_nr == OP_CB_SEQUENCE) {
724 if (nop != 0)
725 return htonl(NFS4ERR_SEQUENCE_POS);
726 } else {
727 if (nop == 0)
728 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
729 }
730
731 switch (op_nr) {
732 case OP_CB_GETATTR:
733 case OP_CB_RECALL:
734 case OP_CB_SEQUENCE:
735 case OP_CB_RECALL_ANY:
736 case OP_CB_RECALL_SLOT:
737 case OP_CB_LAYOUTRECALL:
738 case OP_CB_NOTIFY_DEVICEID:
739 *op = &callback_ops[op_nr];
740 break;
741
742 case OP_CB_NOTIFY:
743 case OP_CB_PUSH_DELEG:
744 case OP_CB_RECALLABLE_OBJ_AVAIL:
745 case OP_CB_WANTS_CANCELLED:
746 case OP_CB_NOTIFY_LOCK:
747 return htonl(NFS4ERR_NOTSUPP);
748
749 default:
750 return htonl(NFS4ERR_OP_ILLEGAL);
751 }
752
753 return htonl(NFS_OK);
754 }
755
756 static void nfs4_callback_free_slot(struct nfs4_session *session)
757 {
758 struct nfs4_slot_table *tbl = &session->bc_slot_table;
759
760 spin_lock(&tbl->slot_tbl_lock);
761 /*
762 * Let the state manager know callback processing done.
763 * A single slot, so highest used slotid is either 0 or -1
764 */
765 tbl->highest_used_slotid = NFS4_NO_SLOT;
766 nfs4_session_drain_complete(session, tbl);
767 spin_unlock(&tbl->slot_tbl_lock);
768 }
769
770 static void nfs4_cb_free_slot(struct cb_process_state *cps)
771 {
772 if (cps->slotid != NFS4_NO_SLOT)
773 nfs4_callback_free_slot(cps->clp->cl_session);
774 }
775
776 #else /* CONFIG_NFS_V4_1 */
777
778 static __be32
779 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
780 {
781 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
782 }
783
784 static void nfs4_cb_free_slot(struct cb_process_state *cps)
785 {
786 }
787 #endif /* CONFIG_NFS_V4_1 */
788
789 static __be32
790 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
791 {
792 switch (op_nr) {
793 case OP_CB_GETATTR:
794 case OP_CB_RECALL:
795 *op = &callback_ops[op_nr];
796 break;
797 default:
798 return htonl(NFS4ERR_OP_ILLEGAL);
799 }
800
801 return htonl(NFS_OK);
802 }
803
804 static __be32 process_op(uint32_t minorversion, int nop,
805 struct svc_rqst *rqstp,
806 struct xdr_stream *xdr_in, void *argp,
807 struct xdr_stream *xdr_out, void *resp,
808 struct cb_process_state *cps)
809 {
810 struct callback_op *op = &callback_ops[0];
811 unsigned int op_nr;
812 __be32 status;
813 long maxlen;
814 __be32 res;
815
816 dprintk("%s: start\n", __func__);
817 status = decode_op_hdr(xdr_in, &op_nr);
818 if (unlikely(status))
819 return status;
820
821 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
822 __func__, minorversion, nop, op_nr);
823
824 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
825 preprocess_nfs4_op(op_nr, &op);
826 if (status == htonl(NFS4ERR_OP_ILLEGAL))
827 op_nr = OP_CB_ILLEGAL;
828 if (status)
829 goto encode_hdr;
830
831 if (cps->drc_status) {
832 status = cps->drc_status;
833 goto encode_hdr;
834 }
835
836 maxlen = xdr_out->end - xdr_out->p;
837 if (maxlen > 0 && maxlen < PAGE_SIZE) {
838 status = op->decode_args(rqstp, xdr_in, argp);
839 if (likely(status == 0))
840 status = op->process_op(argp, resp, cps);
841 } else
842 status = htonl(NFS4ERR_RESOURCE);
843
844 encode_hdr:
845 res = encode_op_hdr(xdr_out, op_nr, status);
846 if (unlikely(res))
847 return res;
848 if (op->encode_res != NULL && status == 0)
849 status = op->encode_res(rqstp, xdr_out, resp);
850 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
851 return status;
852 }
853
854 /*
855 * Decode, process and encode a COMPOUND
856 */
857 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
858 {
859 struct cb_compound_hdr_arg hdr_arg = { 0 };
860 struct cb_compound_hdr_res hdr_res = { NULL };
861 struct xdr_stream xdr_in, xdr_out;
862 __be32 *p, status;
863 struct cb_process_state cps = {
864 .drc_status = 0,
865 .clp = NULL,
866 .slotid = NFS4_NO_SLOT,
867 .net = SVC_NET(rqstp),
868 };
869 unsigned int nops = 0;
870
871 dprintk("%s: start\n", __func__);
872
873 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
874
875 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
876 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
877
878 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
879 if (status == __constant_htonl(NFS4ERR_RESOURCE))
880 return rpc_garbage_args;
881
882 if (hdr_arg.minorversion == 0) {
883 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
884 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
885 return rpc_drop_reply;
886 }
887
888 hdr_res.taglen = hdr_arg.taglen;
889 hdr_res.tag = hdr_arg.tag;
890 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
891 return rpc_system_err;
892
893 while (status == 0 && nops != hdr_arg.nops) {
894 status = process_op(hdr_arg.minorversion, nops, rqstp,
895 &xdr_in, argp, &xdr_out, resp, &cps);
896 nops++;
897 }
898
899 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
900 * resource error in cb_compound status without returning op */
901 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
902 status = htonl(NFS4ERR_RESOURCE);
903 nops--;
904 }
905
906 *hdr_res.status = status;
907 *hdr_res.nops = htonl(nops);
908 nfs4_cb_free_slot(&cps);
909 nfs_put_client(cps.clp);
910 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
911 return rpc_success;
912 }
913
914 /*
915 * Define NFS4 callback COMPOUND ops.
916 */
917 static struct callback_op callback_ops[] = {
918 [0] = {
919 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
920 },
921 [OP_CB_GETATTR] = {
922 .process_op = (callback_process_op_t)nfs4_callback_getattr,
923 .decode_args = (callback_decode_arg_t)decode_getattr_args,
924 .encode_res = (callback_encode_res_t)encode_getattr_res,
925 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
926 },
927 [OP_CB_RECALL] = {
928 .process_op = (callback_process_op_t)nfs4_callback_recall,
929 .decode_args = (callback_decode_arg_t)decode_recall_args,
930 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
931 },
932 #if defined(CONFIG_NFS_V4_1)
933 [OP_CB_LAYOUTRECALL] = {
934 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
935 .decode_args =
936 (callback_decode_arg_t)decode_layoutrecall_args,
937 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
938 },
939 [OP_CB_NOTIFY_DEVICEID] = {
940 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
941 .decode_args =
942 (callback_decode_arg_t)decode_devicenotify_args,
943 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
944 },
945 [OP_CB_SEQUENCE] = {
946 .process_op = (callback_process_op_t)nfs4_callback_sequence,
947 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
948 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
949 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
950 },
951 [OP_CB_RECALL_ANY] = {
952 .process_op = (callback_process_op_t)nfs4_callback_recallany,
953 .decode_args = (callback_decode_arg_t)decode_recallany_args,
954 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
955 },
956 [OP_CB_RECALL_SLOT] = {
957 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
958 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
959 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
960 },
961 #endif /* CONFIG_NFS_V4_1 */
962 };
963
964 /*
965 * Define NFS4 callback procedures
966 */
967 static struct svc_procedure nfs4_callback_procedures1[] = {
968 [CB_NULL] = {
969 .pc_func = nfs4_callback_null,
970 .pc_decode = (kxdrproc_t)nfs4_decode_void,
971 .pc_encode = (kxdrproc_t)nfs4_encode_void,
972 .pc_xdrressize = 1,
973 },
974 [CB_COMPOUND] = {
975 .pc_func = nfs4_callback_compound,
976 .pc_encode = (kxdrproc_t)nfs4_encode_void,
977 .pc_argsize = 256,
978 .pc_ressize = 256,
979 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
980 }
981 };
982
983 struct svc_version nfs4_callback_version1 = {
984 .vs_vers = 1,
985 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
986 .vs_proc = nfs4_callback_procedures1,
987 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
988 .vs_dispatch = NULL,
989 .vs_hidden = 1,
990 };
991
992 struct svc_version nfs4_callback_version4 = {
993 .vs_vers = 4,
994 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
995 .vs_proc = nfs4_callback_procedures1,
996 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
997 .vs_dispatch = NULL,
998 .vs_hidden = 1,
999 };
CRIS linux kernel tree