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nfs41: implement DESTROY_CLIENTID operation
[linux-btrfs-devel.git] / fs / nfs / callback_xdr.c
blobc6c86a77e043fe938c40df750314116b8a3fcbb0
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/slab.h>
13 #include <linux/sunrpc/bc_xprt.h>
14 #include "nfs4_fs.h"
15 #include "callback.h"
16 #include "internal.h"
17
18 #define CB_OP_TAGLEN_MAXSZ (512)
19 #define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
20 #define CB_OP_GETATTR_BITMAP_MAXSZ (4)
21 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
22 CB_OP_GETATTR_BITMAP_MAXSZ + \
23 2 + 2 + 3 + 3)
24 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
25
26 #if defined(CONFIG_NFS_V4_1)
27 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
28 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
29 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
30 4 + 1 + 3)
31 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33 #endif /* CONFIG_NFS_V4_1 */
34
35 #define NFSDBG_FACILITY NFSDBG_CALLBACK
36
37 /* Internal error code */
38 #define NFS4ERR_RESOURCE_HDR 11050
39
40 typedef __be32 (*callback_process_op_t)(void *, void *,
41 struct cb_process_state *);
42 typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
43 typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
44
45
46 struct callback_op {
47 callback_process_op_t process_op;
48 callback_decode_arg_t decode_args;
49 callback_encode_res_t encode_res;
50 long res_maxsize;
51 };
52
53 static struct callback_op callback_ops[];
54
55 static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
56 {
57 return htonl(NFS4_OK);
58 }
59
60 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
61 {
62 return xdr_argsize_check(rqstp, p);
63 }
64
65 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
66 {
67 return xdr_ressize_check(rqstp, p);
68 }
69
70 static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
71 {
72 __be32 *p;
73
74 p = xdr_inline_decode(xdr, nbytes);
75 if (unlikely(p == NULL))
76 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
77 return p;
78 }
79
80 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
81 {
82 __be32 *p;
83
84 p = read_buf(xdr, 4);
85 if (unlikely(p == NULL))
86 return htonl(NFS4ERR_RESOURCE);
87 *len = ntohl(*p);
88
89 if (*len != 0) {
90 p = read_buf(xdr, *len);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *str = (const char *)p;
94 } else
95 *str = NULL;
96
97 return 0;
98 }
99
100 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
101 {
102 __be32 *p;
103
104 p = read_buf(xdr, 4);
105 if (unlikely(p == NULL))
106 return htonl(NFS4ERR_RESOURCE);
107 fh->size = ntohl(*p);
108 if (fh->size > NFS4_FHSIZE)
109 return htonl(NFS4ERR_BADHANDLE);
110 p = read_buf(xdr, fh->size);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 memcpy(&fh->data[0], p, fh->size);
114 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
115 return 0;
116 }
117
118 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
119 {
120 __be32 *p;
121 unsigned int attrlen;
122
123 p = read_buf(xdr, 4);
124 if (unlikely(p == NULL))
125 return htonl(NFS4ERR_RESOURCE);
126 attrlen = ntohl(*p);
127 p = read_buf(xdr, attrlen << 2);
128 if (unlikely(p == NULL))
129 return htonl(NFS4ERR_RESOURCE);
130 if (likely(attrlen > 0))
131 bitmap[0] = ntohl(*p++);
132 if (attrlen > 1)
133 bitmap[1] = ntohl(*p);
134 return 0;
135 }
136
137 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
138 {
139 __be32 *p;
140
141 p = read_buf(xdr, 16);
142 if (unlikely(p == NULL))
143 return htonl(NFS4ERR_RESOURCE);
144 memcpy(stateid->data, p, 16);
145 return 0;
146 }
147
148 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
149 {
150 __be32 *p;
151 __be32 status;
152
153 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
154 if (unlikely(status != 0))
155 return status;
156 /* We do not like overly long tags! */
157 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
158 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
159 __func__, hdr->taglen);
160 return htonl(NFS4ERR_RESOURCE);
161 }
162 p = read_buf(xdr, 12);
163 if (unlikely(p == NULL))
164 return htonl(NFS4ERR_RESOURCE);
165 hdr->minorversion = ntohl(*p++);
166 /* Check minor version is zero or one. */
167 if (hdr->minorversion <= 1) {
168 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 */
169 } else {
170 printk(KERN_WARNING "%s: NFSv4 server callback with "
171 "illegal minor version %u!\n",
172 __func__, hdr->minorversion);
173 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
174 }
175 hdr->nops = ntohl(*p);
176 dprintk("%s: minorversion %d nops %d\n", __func__,
177 hdr->minorversion, hdr->nops);
178 return 0;
179 }
180
181 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
182 {
183 __be32 *p;
184 p = read_buf(xdr, 4);
185 if (unlikely(p == NULL))
186 return htonl(NFS4ERR_RESOURCE_HDR);
187 *op = ntohl(*p);
188 return 0;
189 }
190
191 static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
192 {
193 __be32 status;
194
195 status = decode_fh(xdr, &args->fh);
196 if (unlikely(status != 0))
197 goto out;
198 args->addr = svc_addr(rqstp);
199 status = decode_bitmap(xdr, args->bitmap);
200 out:
201 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
202 return status;
203 }
204
205 static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
206 {
207 __be32 *p;
208 __be32 status;
209
210 args->addr = svc_addr(rqstp);
211 status = decode_stateid(xdr, &args->stateid);
212 if (unlikely(status != 0))
213 goto out;
214 p = read_buf(xdr, 4);
215 if (unlikely(p == NULL)) {
216 status = htonl(NFS4ERR_RESOURCE);
217 goto out;
218 }
219 args->truncate = ntohl(*p);
220 status = decode_fh(xdr, &args->fh);
221 out:
222 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
223 return status;
224 }
225
226 #if defined(CONFIG_NFS_V4_1)
227
228 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
229 struct xdr_stream *xdr,
230 struct cb_layoutrecallargs *args)
231 {
232 __be32 *p;
233 __be32 status = 0;
234 uint32_t iomode;
235
236 args->cbl_addr = svc_addr(rqstp);
237 p = read_buf(xdr, 4 * sizeof(uint32_t));
238 if (unlikely(p == NULL)) {
239 status = htonl(NFS4ERR_BADXDR);
240 goto out;
241 }
242
243 args->cbl_layout_type = ntohl(*p++);
244 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
245 * as it is unusable and ignored with the other types.
246 */
247 iomode = ntohl(*p++);
248 args->cbl_layoutchanged = ntohl(*p++);
249 args->cbl_recall_type = ntohl(*p++);
250
251 if (args->cbl_recall_type == RETURN_FILE) {
252 args->cbl_range.iomode = iomode;
253 status = decode_fh(xdr, &args->cbl_fh);
254 if (unlikely(status != 0))
255 goto out;
256
257 p = read_buf(xdr, 2 * sizeof(uint64_t));
258 if (unlikely(p == NULL)) {
259 status = htonl(NFS4ERR_BADXDR);
260 goto out;
261 }
262 p = xdr_decode_hyper(p, &args->cbl_range.offset);
263 p = xdr_decode_hyper(p, &args->cbl_range.length);
264 status = decode_stateid(xdr, &args->cbl_stateid);
265 if (unlikely(status != 0))
266 goto out;
267 } else if (args->cbl_recall_type == RETURN_FSID) {
268 p = read_buf(xdr, 2 * sizeof(uint64_t));
269 if (unlikely(p == NULL)) {
270 status = htonl(NFS4ERR_BADXDR);
271 goto out;
272 }
273 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
274 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
275 } else if (args->cbl_recall_type != RETURN_ALL) {
276 status = htonl(NFS4ERR_BADXDR);
277 goto out;
278 }
279 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
280 __func__,
281 args->cbl_layout_type, iomode,
282 args->cbl_layoutchanged, args->cbl_recall_type);
283 out:
284 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
285 return status;
286 }
287
288 static
289 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
290 struct xdr_stream *xdr,
291 struct cb_devicenotifyargs *args)
292 {
293 __be32 *p;
294 __be32 status = 0;
295 u32 tmp;
296 int n, i;
297 args->ndevs = 0;
298
299 /* Num of device notifications */
300 p = read_buf(xdr, sizeof(uint32_t));
301 if (unlikely(p == NULL)) {
302 status = htonl(NFS4ERR_BADXDR);
303 goto out;
304 }
305 n = ntohl(*p++);
306 if (n <= 0)
307 goto out;
308
309 args->devs = kmalloc(n * sizeof(*args->devs), GFP_KERNEL);
310 if (!args->devs) {
311 status = htonl(NFS4ERR_DELAY);
312 goto out;
313 }
314
315 /* Decode each dev notification */
316 for (i = 0; i < n; i++) {
317 struct cb_devicenotifyitem *dev = &args->devs[i];
318
319 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
320 if (unlikely(p == NULL)) {
321 status = htonl(NFS4ERR_BADXDR);
322 goto err;
323 }
324
325 tmp = ntohl(*p++); /* bitmap size */
326 if (tmp != 1) {
327 status = htonl(NFS4ERR_INVAL);
328 goto err;
329 }
330 dev->cbd_notify_type = ntohl(*p++);
331 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
332 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
333 status = htonl(NFS4ERR_INVAL);
334 goto err;
335 }
336
337 tmp = ntohl(*p++); /* opaque size */
338 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
339 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
340 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
341 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
342 status = htonl(NFS4ERR_INVAL);
343 goto err;
344 }
345 dev->cbd_layout_type = ntohl(*p++);
346 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
347 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
348
349 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
350 p = read_buf(xdr, sizeof(uint32_t));
351 if (unlikely(p == NULL)) {
352 status = htonl(NFS4ERR_BADXDR);
353 goto err;
354 }
355 dev->cbd_immediate = ntohl(*p++);
356 } else {
357 dev->cbd_immediate = 0;
358 }
359
360 args->ndevs++;
361
362 dprintk("%s: type %d layout 0x%x immediate %d\n",
363 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
364 dev->cbd_immediate);
365 }
366 out:
367 dprintk("%s: status %d ndevs %d\n",
368 __func__, ntohl(status), args->ndevs);
369 return status;
370 err:
371 kfree(args->devs);
372 goto out;
373 }
374
375 static __be32 decode_sessionid(struct xdr_stream *xdr,
376 struct nfs4_sessionid *sid)
377 {
378 __be32 *p;
379 int len = NFS4_MAX_SESSIONID_LEN;
380
381 p = read_buf(xdr, len);
382 if (unlikely(p == NULL))
383 return htonl(NFS4ERR_RESOURCE);
384
385 memcpy(sid->data, p, len);
386 return 0;
387 }
388
389 static __be32 decode_rc_list(struct xdr_stream *xdr,
390 struct referring_call_list *rc_list)
391 {
392 __be32 *p;
393 int i;
394 __be32 status;
395
396 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
397 if (status)
398 goto out;
399
400 status = htonl(NFS4ERR_RESOURCE);
401 p = read_buf(xdr, sizeof(uint32_t));
402 if (unlikely(p == NULL))
403 goto out;
404
405 rc_list->rcl_nrefcalls = ntohl(*p++);
406 if (rc_list->rcl_nrefcalls) {
407 p = read_buf(xdr,
408 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
409 if (unlikely(p == NULL))
410 goto out;
411 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
412 sizeof(*rc_list->rcl_refcalls),
413 GFP_KERNEL);
414 if (unlikely(rc_list->rcl_refcalls == NULL))
415 goto out;
416 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
417 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
418 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
419 }
420 }
421 status = 0;
422
423 out:
424 return status;
425 }
426
427 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
428 struct xdr_stream *xdr,
429 struct cb_sequenceargs *args)
430 {
431 __be32 *p;
432 int i;
433 __be32 status;
434
435 status = decode_sessionid(xdr, &args->csa_sessionid);
436 if (status)
437 goto out;
438
439 status = htonl(NFS4ERR_RESOURCE);
440 p = read_buf(xdr, 5 * sizeof(uint32_t));
441 if (unlikely(p == NULL))
442 goto out;
443
444 args->csa_addr = svc_addr(rqstp);
445 args->csa_sequenceid = ntohl(*p++);
446 args->csa_slotid = ntohl(*p++);
447 args->csa_highestslotid = ntohl(*p++);
448 args->csa_cachethis = ntohl(*p++);
449 args->csa_nrclists = ntohl(*p++);
450 args->csa_rclists = NULL;
451 if (args->csa_nrclists) {
452 args->csa_rclists = kmalloc(args->csa_nrclists *
453 sizeof(*args->csa_rclists),
454 GFP_KERNEL);
455 if (unlikely(args->csa_rclists == NULL))
456 goto out;
457
458 for (i = 0; i < args->csa_nrclists; i++) {
459 status = decode_rc_list(xdr, &args->csa_rclists[i]);
460 if (status)
461 goto out_free;
462 }
463 }
464 status = 0;
465
466 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
467 "highestslotid %u cachethis %d nrclists %u\n",
468 __func__,
469 ((u32 *)&args->csa_sessionid)[0],
470 ((u32 *)&args->csa_sessionid)[1],
471 ((u32 *)&args->csa_sessionid)[2],
472 ((u32 *)&args->csa_sessionid)[3],
473 args->csa_sequenceid, args->csa_slotid,
474 args->csa_highestslotid, args->csa_cachethis,
475 args->csa_nrclists);
476 out:
477 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
478 return status;
479
480 out_free:
481 for (i = 0; i < args->csa_nrclists; i++)
482 kfree(args->csa_rclists[i].rcl_refcalls);
483 kfree(args->csa_rclists);
484 goto out;
485 }
486
487 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
488 struct xdr_stream *xdr,
489 struct cb_recallanyargs *args)
490 {
491 __be32 *p;
492
493 args->craa_addr = svc_addr(rqstp);
494 p = read_buf(xdr, 4);
495 if (unlikely(p == NULL))
496 return htonl(NFS4ERR_BADXDR);
497 args->craa_objs_to_keep = ntohl(*p++);
498 p = read_buf(xdr, 4);
499 if (unlikely(p == NULL))
500 return htonl(NFS4ERR_BADXDR);
501 args->craa_type_mask = ntohl(*p);
502
503 return 0;
504 }
505
506 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
507 struct xdr_stream *xdr,
508 struct cb_recallslotargs *args)
509 {
510 __be32 *p;
511
512 args->crsa_addr = svc_addr(rqstp);
513 p = read_buf(xdr, 4);
514 if (unlikely(p == NULL))
515 return htonl(NFS4ERR_BADXDR);
516 args->crsa_target_max_slots = ntohl(*p++);
517 return 0;
518 }
519
520 #endif /* CONFIG_NFS_V4_1 */
521
522 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
523 {
524 __be32 *p;
525
526 p = xdr_reserve_space(xdr, 4 + len);
527 if (unlikely(p == NULL))
528 return htonl(NFS4ERR_RESOURCE);
529 xdr_encode_opaque(p, str, len);
530 return 0;
531 }
532
533 #define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
534 #define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
535 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
536 {
537 __be32 bm[2];
538 __be32 *p;
539
540 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
541 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
542 if (bm[1] != 0) {
543 p = xdr_reserve_space(xdr, 16);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_RESOURCE);
546 *p++ = htonl(2);
547 *p++ = bm[0];
548 *p++ = bm[1];
549 } else if (bm[0] != 0) {
550 p = xdr_reserve_space(xdr, 12);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_RESOURCE);
553 *p++ = htonl(1);
554 *p++ = bm[0];
555 } else {
556 p = xdr_reserve_space(xdr, 8);
557 if (unlikely(p == NULL))
558 return htonl(NFS4ERR_RESOURCE);
559 *p++ = htonl(0);
560 }
561 *savep = p;
562 return 0;
563 }
564
565 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
566 {
567 __be32 *p;
568
569 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
570 return 0;
571 p = xdr_reserve_space(xdr, 8);
572 if (unlikely(!p))
573 return htonl(NFS4ERR_RESOURCE);
574 p = xdr_encode_hyper(p, change);
575 return 0;
576 }
577
578 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
579 {
580 __be32 *p;
581
582 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
583 return 0;
584 p = xdr_reserve_space(xdr, 8);
585 if (unlikely(!p))
586 return htonl(NFS4ERR_RESOURCE);
587 p = xdr_encode_hyper(p, size);
588 return 0;
589 }
590
591 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
592 {
593 __be32 *p;
594
595 p = xdr_reserve_space(xdr, 12);
596 if (unlikely(!p))
597 return htonl(NFS4ERR_RESOURCE);
598 p = xdr_encode_hyper(p, time->tv_sec);
599 *p = htonl(time->tv_nsec);
600 return 0;
601 }
602
603 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
604 {
605 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
606 return 0;
607 return encode_attr_time(xdr,time);
608 }
609
610 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
611 {
612 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
613 return 0;
614 return encode_attr_time(xdr,time);
615 }
616
617 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
618 {
619 __be32 status;
620
621 hdr->status = xdr_reserve_space(xdr, 4);
622 if (unlikely(hdr->status == NULL))
623 return htonl(NFS4ERR_RESOURCE);
624 status = encode_string(xdr, hdr->taglen, hdr->tag);
625 if (unlikely(status != 0))
626 return status;
627 hdr->nops = xdr_reserve_space(xdr, 4);
628 if (unlikely(hdr->nops == NULL))
629 return htonl(NFS4ERR_RESOURCE);
630 return 0;
631 }
632
633 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
634 {
635 __be32 *p;
636
637 p = xdr_reserve_space(xdr, 8);
638 if (unlikely(p == NULL))
639 return htonl(NFS4ERR_RESOURCE_HDR);
640 *p++ = htonl(op);
641 *p = res;
642 return 0;
643 }
644
645 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
646 {
647 __be32 *savep = NULL;
648 __be32 status = res->status;
649
650 if (unlikely(status != 0))
651 goto out;
652 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
653 if (unlikely(status != 0))
654 goto out;
655 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
656 if (unlikely(status != 0))
657 goto out;
658 status = encode_attr_size(xdr, res->bitmap, res->size);
659 if (unlikely(status != 0))
660 goto out;
661 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
662 if (unlikely(status != 0))
663 goto out;
664 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
665 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
666 out:
667 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
668 return status;
669 }
670
671 #if defined(CONFIG_NFS_V4_1)
672
673 static __be32 encode_sessionid(struct xdr_stream *xdr,
674 const struct nfs4_sessionid *sid)
675 {
676 __be32 *p;
677 int len = NFS4_MAX_SESSIONID_LEN;
678
679 p = xdr_reserve_space(xdr, len);
680 if (unlikely(p == NULL))
681 return htonl(NFS4ERR_RESOURCE);
682
683 memcpy(p, sid, len);
684 return 0;
685 }
686
687 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
688 struct xdr_stream *xdr,
689 const struct cb_sequenceres *res)
690 {
691 __be32 *p;
692 unsigned status = res->csr_status;
693
694 if (unlikely(status != 0))
695 goto out;
696
697 encode_sessionid(xdr, &res->csr_sessionid);
698
699 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
700 if (unlikely(p == NULL))
701 return htonl(NFS4ERR_RESOURCE);
702
703 *p++ = htonl(res->csr_sequenceid);
704 *p++ = htonl(res->csr_slotid);
705 *p++ = htonl(res->csr_highestslotid);
706 *p++ = htonl(res->csr_target_highestslotid);
707 out:
708 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
709 return status;
710 }
711
712 static __be32
713 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
714 {
715 if (op_nr == OP_CB_SEQUENCE) {
716 if (nop != 0)
717 return htonl(NFS4ERR_SEQUENCE_POS);
718 } else {
719 if (nop == 0)
720 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
721 }
722
723 switch (op_nr) {
724 case OP_CB_GETATTR:
725 case OP_CB_RECALL:
726 case OP_CB_SEQUENCE:
727 case OP_CB_RECALL_ANY:
728 case OP_CB_RECALL_SLOT:
729 case OP_CB_LAYOUTRECALL:
730 case OP_CB_NOTIFY_DEVICEID:
731 *op = &callback_ops[op_nr];
732 break;
733
734 case OP_CB_NOTIFY:
735 case OP_CB_PUSH_DELEG:
736 case OP_CB_RECALLABLE_OBJ_AVAIL:
737 case OP_CB_WANTS_CANCELLED:
738 case OP_CB_NOTIFY_LOCK:
739 return htonl(NFS4ERR_NOTSUPP);
740
741 default:
742 return htonl(NFS4ERR_OP_ILLEGAL);
743 }
744
745 return htonl(NFS_OK);
746 }
747
748 static void nfs4_callback_free_slot(struct nfs4_session *session)
749 {
750 struct nfs4_slot_table *tbl = &session->bc_slot_table;
751
752 spin_lock(&tbl->slot_tbl_lock);
753 /*
754 * Let the state manager know callback processing done.
755 * A single slot, so highest used slotid is either 0 or -1
756 */
757 tbl->highest_used_slotid--;
758 nfs4_check_drain_bc_complete(session);
759 spin_unlock(&tbl->slot_tbl_lock);
760 }
761
762 static void nfs4_cb_free_slot(struct nfs_client *clp)
763 {
764 if (clp && clp->cl_session)
765 nfs4_callback_free_slot(clp->cl_session);
766 }
767
768 /* A single slot, so highest used slotid is either 0 or -1 */
769 void nfs4_cb_take_slot(struct nfs_client *clp)
770 {
771 struct nfs4_slot_table *tbl = &clp->cl_session->bc_slot_table;
772
773 spin_lock(&tbl->slot_tbl_lock);
774 tbl->highest_used_slotid++;
775 BUG_ON(tbl->highest_used_slotid != 0);
776 spin_unlock(&tbl->slot_tbl_lock);
777 }
778
779 #else /* CONFIG_NFS_V4_1 */
780
781 static __be32
782 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
783 {
784 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
785 }
786
787 static void nfs4_cb_free_slot(struct nfs_client *clp)
788 {
789 }
790 #endif /* CONFIG_NFS_V4_1 */
791
792 static __be32
793 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
794 {
795 switch (op_nr) {
796 case OP_CB_GETATTR:
797 case OP_CB_RECALL:
798 *op = &callback_ops[op_nr];
799 break;
800 default:
801 return htonl(NFS4ERR_OP_ILLEGAL);
802 }
803
804 return htonl(NFS_OK);
805 }
806
807 static __be32 process_op(uint32_t minorversion, int nop,
808 struct svc_rqst *rqstp,
809 struct xdr_stream *xdr_in, void *argp,
810 struct xdr_stream *xdr_out, void *resp,
811 struct cb_process_state *cps)
812 {
813 struct callback_op *op = &callback_ops[0];
814 unsigned int op_nr;
815 __be32 status;
816 long maxlen;
817 __be32 res;
818
819 dprintk("%s: start\n", __func__);
820 status = decode_op_hdr(xdr_in, &op_nr);
821 if (unlikely(status))
822 return status;
823
824 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
825 __func__, minorversion, nop, op_nr);
826
827 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
828 preprocess_nfs4_op(op_nr, &op);
829 if (status == htonl(NFS4ERR_OP_ILLEGAL))
830 op_nr = OP_CB_ILLEGAL;
831 if (status)
832 goto encode_hdr;
833
834 if (cps->drc_status) {
835 status = cps->drc_status;
836 goto encode_hdr;
837 }
838
839 maxlen = xdr_out->end - xdr_out->p;
840 if (maxlen > 0 && maxlen < PAGE_SIZE) {
841 status = op->decode_args(rqstp, xdr_in, argp);
842 if (likely(status == 0))
843 status = op->process_op(argp, resp, cps);
844 } else
845 status = htonl(NFS4ERR_RESOURCE);
846
847 encode_hdr:
848 res = encode_op_hdr(xdr_out, op_nr, status);
849 if (unlikely(res))
850 return res;
851 if (op->encode_res != NULL && status == 0)
852 status = op->encode_res(rqstp, xdr_out, resp);
853 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
854 return status;
855 }
856
857 /*
858 * Decode, process and encode a COMPOUND
859 */
860 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
861 {
862 struct cb_compound_hdr_arg hdr_arg = { 0 };
863 struct cb_compound_hdr_res hdr_res = { NULL };
864 struct xdr_stream xdr_in, xdr_out;
865 __be32 *p, status;
866 struct cb_process_state cps = {
867 .drc_status = 0,
868 .clp = NULL,
869 };
870 unsigned int nops = 0;
871
872 dprintk("%s: start\n", __func__);
873
874 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
875
876 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
877 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
878
879 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
880 if (status == __constant_htonl(NFS4ERR_RESOURCE))
881 return rpc_garbage_args;
882
883 if (hdr_arg.minorversion == 0) {
884 cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
885 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
886 return rpc_drop_reply;
887 }
888
889 hdr_res.taglen = hdr_arg.taglen;
890 hdr_res.tag = hdr_arg.tag;
891 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
892 return rpc_system_err;
893
894 while (status == 0 && nops != hdr_arg.nops) {
895 status = process_op(hdr_arg.minorversion, nops, rqstp,
896 &xdr_in, argp, &xdr_out, resp, &cps);
897 nops++;
898 }
899
900 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
901 * resource error in cb_compound status without returning op */
902 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
903 status = htonl(NFS4ERR_RESOURCE);
904 nops--;
905 }
906
907 *hdr_res.status = status;
908 *hdr_res.nops = htonl(nops);
909 nfs4_cb_free_slot(cps.clp);
910 nfs_put_client(cps.clp);
911 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
912 return rpc_success;
913 }
914
915 /*
916 * Define NFS4 callback COMPOUND ops.
917 */
918 static struct callback_op callback_ops[] = {
919 [0] = {
920 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
921 },
922 [OP_CB_GETATTR] = {
923 .process_op = (callback_process_op_t)nfs4_callback_getattr,
924 .decode_args = (callback_decode_arg_t)decode_getattr_args,
925 .encode_res = (callback_encode_res_t)encode_getattr_res,
926 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
927 },
928 [OP_CB_RECALL] = {
929 .process_op = (callback_process_op_t)nfs4_callback_recall,
930 .decode_args = (callback_decode_arg_t)decode_recall_args,
931 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
932 },
933 #if defined(CONFIG_NFS_V4_1)
934 [OP_CB_LAYOUTRECALL] = {
935 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
936 .decode_args =
937 (callback_decode_arg_t)decode_layoutrecall_args,
938 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
939 },
940 [OP_CB_NOTIFY_DEVICEID] = {
941 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
942 .decode_args =
943 (callback_decode_arg_t)decode_devicenotify_args,
944 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
945 },
946 [OP_CB_SEQUENCE] = {
947 .process_op = (callback_process_op_t)nfs4_callback_sequence,
948 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
949 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
950 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
951 },
952 [OP_CB_RECALL_ANY] = {
953 .process_op = (callback_process_op_t)nfs4_callback_recallany,
954 .decode_args = (callback_decode_arg_t)decode_recallany_args,
955 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
956 },
957 [OP_CB_RECALL_SLOT] = {
958 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
959 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
960 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
961 },
962 #endif /* CONFIG_NFS_V4_1 */
963 };
964
965 /*
966 * Define NFS4 callback procedures
967 */
968 static struct svc_procedure nfs4_callback_procedures1[] = {
969 [CB_NULL] = {
970 .pc_func = nfs4_callback_null,
971 .pc_decode = (kxdrproc_t)nfs4_decode_void,
972 .pc_encode = (kxdrproc_t)nfs4_encode_void,
973 .pc_xdrressize = 1,
974 },
975 [CB_COMPOUND] = {
976 .pc_func = nfs4_callback_compound,
977 .pc_encode = (kxdrproc_t)nfs4_encode_void,
978 .pc_argsize = 256,
979 .pc_ressize = 256,
980 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
981 }
982 };
983
984 struct svc_version nfs4_callback_version1 = {
985 .vs_vers = 1,
986 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
987 .vs_proc = nfs4_callback_procedures1,
988 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
989 .vs_dispatch = NULL,
990 .vs_hidden = 1,
991 };
992
993 struct svc_version nfs4_callback_version4 = {
994 .vs_vers = 4,
995 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
996 .vs_proc = nfs4_callback_procedures1,
997 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
998 .vs_dispatch = NULL,
999 };
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