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Linux 4.6-rc6
[cris-mirror.git] / fs / nfs / callback_xdr.c
blob976c90608e5618103d385a3436cafe461873a867
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 * 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)
29
30 #if defined(CONFIG_NFS_V4_1)
31 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
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 NFS4_MAX_SESSIONID_LEN + \
35 (1 + 3) * 4) // seqid, 3 slotids
36 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
37 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38 #endif /* CONFIG_NFS_V4_1 */
39
40 #define NFSDBG_FACILITY NFSDBG_CALLBACK
41
42 /* Internal error code */
43 #define NFS4ERR_RESOURCE_HDR 11050
44
45 typedef __be32 (*callback_process_op_t)(void *, void *,
46 struct cb_process_state *);
47 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
48 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
49
50
51 struct 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
58 static struct callback_op callback_ops[];
59
60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
61 {
62 return htonl(NFS4_OK);
63 }
64
65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
66 {
67 return xdr_argsize_check(rqstp, p);
68 }
69
70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
71 {
72 return xdr_ressize_check(rqstp, p);
73 }
74
75 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
76 {
77 __be32 *p;
78
79 p = xdr_inline_decode(xdr, nbytes);
80 if (unlikely(p == NULL))
81 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
82 return p;
83 }
84
85 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
86 {
87 __be32 *p;
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
105 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
106 {
107 __be32 *p;
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
123 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
124 {
125 __be32 *p;
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
142 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
143 {
144 __be32 *p;
145
146 p = read_buf(xdr, NFS4_STATEID_SIZE);
147 if (unlikely(p == NULL))
148 return htonl(NFS4ERR_RESOURCE);
149 memcpy(stateid, p, NFS4_STATEID_SIZE);
150 return 0;
151 }
152
153 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
154 {
155 __be32 *p;
156 __be32 status;
157
158 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
159 if (unlikely(status != 0))
160 return status;
161 /* We do not like overly long tags! */
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);
165 return htonl(NFS4ERR_RESOURCE);
166 }
167 p = read_buf(xdr, 12);
168 if (unlikely(p == NULL))
169 return htonl(NFS4ERR_RESOURCE);
170 hdr->minorversion = ntohl(*p++);
171 /* Check for minor version support */
172 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 "illegal minor version %u!\n",
177 __func__, hdr->minorversion);
178 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
179 }
180 hdr->nops = ntohl(*p);
181 dprintk("%s: minorversion %d nops %d\n", __func__,
182 hdr->minorversion, hdr->nops);
183 return 0;
184 }
185
186 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
187 {
188 __be32 *p;
189 p = read_buf(xdr, 4);
190 if (unlikely(p == NULL))
191 return htonl(NFS4ERR_RESOURCE_HDR);
192 *op = ntohl(*p);
193 return 0;
194 }
195
196 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
197 {
198 __be32 status;
199
200 status = decode_fh(xdr, &args->fh);
201 if (unlikely(status != 0))
202 goto out;
203 status = decode_bitmap(xdr, args->bitmap);
204 out:
205 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
206 return status;
207 }
208
209 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
210 {
211 __be32 *p;
212 __be32 status;
213
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 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_array(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
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 return 0;
392 }
393
394 static __be32 decode_rc_list(struct xdr_stream *xdr,
395 struct referring_call_list *rc_list)
396 {
397 __be32 *p;
398 int i;
399 __be32 status;
400
401 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
402 if (status)
403 goto out;
404
405 status = htonl(NFS4ERR_RESOURCE);
406 p = read_buf(xdr, sizeof(uint32_t));
407 if (unlikely(p == NULL))
408 goto out;
409
410 rc_list->rcl_nrefcalls = ntohl(*p++);
411 if (rc_list->rcl_nrefcalls) {
412 p = read_buf(xdr,
413 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
414 if (unlikely(p == NULL))
415 goto out;
416 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
417 sizeof(*rc_list->rcl_refcalls),
418 GFP_KERNEL);
419 if (unlikely(rc_list->rcl_refcalls == NULL))
420 goto out;
421 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
422 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
423 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
424 }
425 }
426 status = 0;
427
428 out:
429 return status;
430 }
431
432 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
433 struct xdr_stream *xdr,
434 struct cb_sequenceargs *args)
435 {
436 __be32 *p;
437 int i;
438 __be32 status;
439
440 status = decode_sessionid(xdr, &args->csa_sessionid);
441 if (status)
442 goto out;
443
444 status = htonl(NFS4ERR_RESOURCE);
445 p = read_buf(xdr, 5 * sizeof(uint32_t));
446 if (unlikely(p == NULL))
447 goto out;
448
449 args->csa_addr = svc_addr(rqstp);
450 args->csa_sequenceid = ntohl(*p++);
451 args->csa_slotid = ntohl(*p++);
452 args->csa_highestslotid = ntohl(*p++);
453 args->csa_cachethis = ntohl(*p++);
454 args->csa_nrclists = ntohl(*p++);
455 args->csa_rclists = NULL;
456 if (args->csa_nrclists) {
457 args->csa_rclists = kmalloc_array(args->csa_nrclists,
458 sizeof(*args->csa_rclists),
459 GFP_KERNEL);
460 if (unlikely(args->csa_rclists == NULL))
461 goto out;
462
463 for (i = 0; i < args->csa_nrclists; i++) {
464 status = decode_rc_list(xdr, &args->csa_rclists[i]);
465 if (status) {
466 args->csa_nrclists = i;
467 goto out_free;
468 }
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 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 p = read_buf(xdr, 4);
520 if (unlikely(p == NULL))
521 return htonl(NFS4ERR_BADXDR);
522 args->crsa_target_highest_slotid = ntohl(*p++);
523 return 0;
524 }
525
526 #endif /* CONFIG_NFS_V4_1 */
527
528 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
529 {
530 __be32 *p;
531
532 p = xdr_reserve_space(xdr, 4 + len);
533 if (unlikely(p == NULL))
534 return htonl(NFS4ERR_RESOURCE);
535 xdr_encode_opaque(p, str, len);
536 return 0;
537 }
538
539 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
540 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
541 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
542 {
543 __be32 bm[2];
544 __be32 *p;
545
546 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
547 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
548 if (bm[1] != 0) {
549 p = xdr_reserve_space(xdr, 16);
550 if (unlikely(p == NULL))
551 return htonl(NFS4ERR_RESOURCE);
552 *p++ = htonl(2);
553 *p++ = bm[0];
554 *p++ = bm[1];
555 } else if (bm[0] != 0) {
556 p = xdr_reserve_space(xdr, 12);
557 if (unlikely(p == NULL))
558 return htonl(NFS4ERR_RESOURCE);
559 *p++ = htonl(1);
560 *p++ = bm[0];
561 } else {
562 p = xdr_reserve_space(xdr, 8);
563 if (unlikely(p == NULL))
564 return htonl(NFS4ERR_RESOURCE);
565 *p++ = htonl(0);
566 }
567 *savep = p;
568 return 0;
569 }
570
571 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
572 {
573 __be32 *p;
574
575 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
576 return 0;
577 p = xdr_reserve_space(xdr, 8);
578 if (unlikely(!p))
579 return htonl(NFS4ERR_RESOURCE);
580 p = xdr_encode_hyper(p, change);
581 return 0;
582 }
583
584 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
585 {
586 __be32 *p;
587
588 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
589 return 0;
590 p = xdr_reserve_space(xdr, 8);
591 if (unlikely(!p))
592 return htonl(NFS4ERR_RESOURCE);
593 p = xdr_encode_hyper(p, size);
594 return 0;
595 }
596
597 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
598 {
599 __be32 *p;
600
601 p = xdr_reserve_space(xdr, 12);
602 if (unlikely(!p))
603 return htonl(NFS4ERR_RESOURCE);
604 p = xdr_encode_hyper(p, time->tv_sec);
605 *p = htonl(time->tv_nsec);
606 return 0;
607 }
608
609 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
610 {
611 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
612 return 0;
613 return encode_attr_time(xdr,time);
614 }
615
616 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
617 {
618 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
619 return 0;
620 return encode_attr_time(xdr,time);
621 }
622
623 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
624 {
625 __be32 status;
626
627 hdr->status = xdr_reserve_space(xdr, 4);
628 if (unlikely(hdr->status == NULL))
629 return htonl(NFS4ERR_RESOURCE);
630 status = encode_string(xdr, hdr->taglen, hdr->tag);
631 if (unlikely(status != 0))
632 return status;
633 hdr->nops = xdr_reserve_space(xdr, 4);
634 if (unlikely(hdr->nops == NULL))
635 return htonl(NFS4ERR_RESOURCE);
636 return 0;
637 }
638
639 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
640 {
641 __be32 *p;
642
643 p = xdr_reserve_space(xdr, 8);
644 if (unlikely(p == NULL))
645 return htonl(NFS4ERR_RESOURCE_HDR);
646 *p++ = htonl(op);
647 *p = res;
648 return 0;
649 }
650
651 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
652 {
653 __be32 *savep = NULL;
654 __be32 status = res->status;
655
656 if (unlikely(status != 0))
657 goto out;
658 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
659 if (unlikely(status != 0))
660 goto out;
661 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
662 if (unlikely(status != 0))
663 goto out;
664 status = encode_attr_size(xdr, res->bitmap, res->size);
665 if (unlikely(status != 0))
666 goto out;
667 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
668 if (unlikely(status != 0))
669 goto out;
670 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
671 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
672 out:
673 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
674 return status;
675 }
676
677 #if defined(CONFIG_NFS_V4_1)
678
679 static __be32 encode_sessionid(struct xdr_stream *xdr,
680 const struct nfs4_sessionid *sid)
681 {
682 __be32 *p;
683
684 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
685 if (unlikely(p == NULL))
686 return htonl(NFS4ERR_RESOURCE);
687
688 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
689 return 0;
690 }
691
692 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
693 struct xdr_stream *xdr,
694 const struct cb_sequenceres *res)
695 {
696 __be32 *p;
697 __be32 status = res->csr_status;
698
699 if (unlikely(status != 0))
700 goto out;
701
702 status = encode_sessionid(xdr, &res->csr_sessionid);
703 if (status)
704 goto out;
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 struct nfs4_slot *slot)
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 nfs4_free_slot(tbl, slot);
766 nfs4_slot_tbl_drain_complete(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->slot) {
773 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
774 cps->slot = NULL;
775 }
776 }
777
778 #else /* CONFIG_NFS_V4_1 */
779
780 static __be32
781 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
782 {
783 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
784 }
785
786 static void nfs4_cb_free_slot(struct cb_process_state *cps)
787 {
788 }
789 #endif /* CONFIG_NFS_V4_1 */
790
791 #ifdef CONFIG_NFS_V4_2
792 static __be32
793 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
794 {
795 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
796 if (status != htonl(NFS4ERR_OP_ILLEGAL))
797 return status;
798
799 if (op_nr == OP_CB_OFFLOAD)
800 return htonl(NFS4ERR_NOTSUPP);
801 return htonl(NFS4ERR_OP_ILLEGAL);
802 }
803 #else /* CONFIG_NFS_V4_2 */
804 static __be32
805 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
806 {
807 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
808 }
809 #endif /* CONFIG_NFS_V4_2 */
810
811 static __be32
812 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
813 {
814 switch (op_nr) {
815 case OP_CB_GETATTR:
816 case OP_CB_RECALL:
817 *op = &callback_ops[op_nr];
818 break;
819 default:
820 return htonl(NFS4ERR_OP_ILLEGAL);
821 }
822
823 return htonl(NFS_OK);
824 }
825
826 static __be32 process_op(int nop, struct svc_rqst *rqstp,
827 struct xdr_stream *xdr_in, void *argp,
828 struct xdr_stream *xdr_out, void *resp,
829 struct cb_process_state *cps)
830 {
831 struct callback_op *op = &callback_ops[0];
832 unsigned int op_nr;
833 __be32 status;
834 long maxlen;
835 __be32 res;
836
837 dprintk("%s: start\n", __func__);
838 status = decode_op_hdr(xdr_in, &op_nr);
839 if (unlikely(status))
840 return status;
841
842 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
843 __func__, cps->minorversion, nop, op_nr);
844
845 switch (cps->minorversion) {
846 case 0:
847 status = preprocess_nfs4_op(op_nr, &op);
848 break;
849 case 1:
850 status = preprocess_nfs41_op(nop, op_nr, &op);
851 break;
852 case 2:
853 status = preprocess_nfs42_op(nop, op_nr, &op);
854 break;
855 default:
856 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
857 }
858
859 if (status == htonl(NFS4ERR_OP_ILLEGAL))
860 op_nr = OP_CB_ILLEGAL;
861 if (status)
862 goto encode_hdr;
863
864 if (cps->drc_status) {
865 status = cps->drc_status;
866 goto encode_hdr;
867 }
868
869 maxlen = xdr_out->end - xdr_out->p;
870 if (maxlen > 0 && maxlen < PAGE_SIZE) {
871 status = op->decode_args(rqstp, xdr_in, argp);
872 if (likely(status == 0))
873 status = op->process_op(argp, resp, cps);
874 } else
875 status = htonl(NFS4ERR_RESOURCE);
876
877 encode_hdr:
878 res = encode_op_hdr(xdr_out, op_nr, status);
879 if (unlikely(res))
880 return res;
881 if (op->encode_res != NULL && status == 0)
882 status = op->encode_res(rqstp, xdr_out, resp);
883 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
884 return status;
885 }
886
887 /*
888 * Decode, process and encode a COMPOUND
889 */
890 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
891 {
892 struct cb_compound_hdr_arg hdr_arg = { 0 };
893 struct cb_compound_hdr_res hdr_res = { NULL };
894 struct xdr_stream xdr_in, xdr_out;
895 __be32 *p, status;
896 struct cb_process_state cps = {
897 .drc_status = 0,
898 .clp = NULL,
899 .net = SVC_NET(rqstp),
900 };
901 unsigned int nops = 0;
902
903 dprintk("%s: start\n", __func__);
904
905 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
906
907 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
908 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
909
910 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
911 if (status == htonl(NFS4ERR_RESOURCE))
912 return rpc_garbage_args;
913
914 if (hdr_arg.minorversion == 0) {
915 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
916 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
917 return rpc_drop_reply;
918 }
919
920 cps.minorversion = hdr_arg.minorversion;
921 hdr_res.taglen = hdr_arg.taglen;
922 hdr_res.tag = hdr_arg.tag;
923 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
924 return rpc_system_err;
925
926 while (status == 0 && nops != hdr_arg.nops) {
927 status = process_op(nops, rqstp, &xdr_in,
928 argp, &xdr_out, resp, &cps);
929 nops++;
930 }
931
932 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
933 * resource error in cb_compound status without returning op */
934 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
935 status = htonl(NFS4ERR_RESOURCE);
936 nops--;
937 }
938
939 *hdr_res.status = status;
940 *hdr_res.nops = htonl(nops);
941 nfs4_cb_free_slot(&cps);
942 nfs_put_client(cps.clp);
943 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
944 return rpc_success;
945 }
946
947 /*
948 * Define NFS4 callback COMPOUND ops.
949 */
950 static struct callback_op callback_ops[] = {
951 [0] = {
952 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
953 },
954 [OP_CB_GETATTR] = {
955 .process_op = (callback_process_op_t)nfs4_callback_getattr,
956 .decode_args = (callback_decode_arg_t)decode_getattr_args,
957 .encode_res = (callback_encode_res_t)encode_getattr_res,
958 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
959 },
960 [OP_CB_RECALL] = {
961 .process_op = (callback_process_op_t)nfs4_callback_recall,
962 .decode_args = (callback_decode_arg_t)decode_recall_args,
963 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
964 },
965 #if defined(CONFIG_NFS_V4_1)
966 [OP_CB_LAYOUTRECALL] = {
967 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
968 .decode_args =
969 (callback_decode_arg_t)decode_layoutrecall_args,
970 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
971 },
972 [OP_CB_NOTIFY_DEVICEID] = {
973 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
974 .decode_args =
975 (callback_decode_arg_t)decode_devicenotify_args,
976 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
977 },
978 [OP_CB_SEQUENCE] = {
979 .process_op = (callback_process_op_t)nfs4_callback_sequence,
980 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
981 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
982 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
983 },
984 [OP_CB_RECALL_ANY] = {
985 .process_op = (callback_process_op_t)nfs4_callback_recallany,
986 .decode_args = (callback_decode_arg_t)decode_recallany_args,
987 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
988 },
989 [OP_CB_RECALL_SLOT] = {
990 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
991 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
992 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
993 },
994 #endif /* CONFIG_NFS_V4_1 */
995 };
996
997 /*
998 * Define NFS4 callback procedures
999 */
1000 static struct svc_procedure nfs4_callback_procedures1[] = {
1001 [CB_NULL] = {
1002 .pc_func = nfs4_callback_null,
1003 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1004 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1005 .pc_xdrressize = 1,
1006 },
1007 [CB_COMPOUND] = {
1008 .pc_func = nfs4_callback_compound,
1009 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1010 .pc_argsize = 256,
1011 .pc_ressize = 256,
1012 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1013 }
1014 };
1015
1016 struct svc_version nfs4_callback_version1 = {
1017 .vs_vers = 1,
1018 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1019 .vs_proc = nfs4_callback_procedures1,
1020 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1021 .vs_dispatch = NULL,
1022 .vs_hidden = 1,
1023 };
1024
1025 struct svc_version nfs4_callback_version4 = {
1026 .vs_vers = 4,
1027 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1028 .vs_proc = nfs4_callback_procedures1,
1029 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1030 .vs_dispatch = NULL,
1031 .vs_hidden = 1,
1032 };
CRIS linux kernel tree