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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#define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39#endif /* CONFIG_NFS_V4_1 */
40
41#define NFSDBG_FACILITY NFSDBG_CALLBACK
42
43/* Internal error code */
44#define NFS4ERR_RESOURCE_HDR 11050
45
46typedef __be32 (*callback_process_op_t)(void *, void *,
47 struct cb_process_state *);
48typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
49typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
50
51
52struct callback_op {
53 callback_process_op_t process_op;
54 callback_decode_arg_t decode_args;
55 callback_encode_res_t encode_res;
56 long res_maxsize;
57};
58
59static struct callback_op callback_ops[];
60
61static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
62{
63 return htonl(NFS4_OK);
64}
65
66static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
67{
68 return xdr_argsize_check(rqstp, p);
69}
70
71static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
72{
73 return xdr_ressize_check(rqstp, p);
74}
75
76static __be32 *read_buf(struct xdr_stream *xdr, size_t nbytes)
77{
78 __be32 *p;
79
80 p = xdr_inline_decode(xdr, nbytes);
81 if (unlikely(p == NULL))
82 printk(KERN_WARNING "NFS: NFSv4 callback reply buffer overflowed!\n");
83 return p;
84}
85
86static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
87{
88 __be32 *p;
89
90 p = read_buf(xdr, 4);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 *len = ntohl(*p);
94
95 if (*len != 0) {
96 p = read_buf(xdr, *len);
97 if (unlikely(p == NULL))
98 return htonl(NFS4ERR_RESOURCE);
99 *str = (const char *)p;
100 } else
101 *str = NULL;
102
103 return 0;
104}
105
106static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
107{
108 __be32 *p;
109
110 p = read_buf(xdr, 4);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 fh->size = ntohl(*p);
114 if (fh->size > NFS4_FHSIZE)
115 return htonl(NFS4ERR_BADHANDLE);
116 p = read_buf(xdr, fh->size);
117 if (unlikely(p == NULL))
118 return htonl(NFS4ERR_RESOURCE);
119 memcpy(&fh->data[0], p, fh->size);
120 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
121 return 0;
122}
123
124static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
125{
126 __be32 *p;
127 unsigned int attrlen;
128
129 p = read_buf(xdr, 4);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 attrlen = ntohl(*p);
133 p = read_buf(xdr, attrlen << 2);
134 if (unlikely(p == NULL))
135 return htonl(NFS4ERR_RESOURCE);
136 if (likely(attrlen > 0))
137 bitmap[0] = ntohl(*p++);
138 if (attrlen > 1)
139 bitmap[1] = ntohl(*p);
140 return 0;
141}
142
143static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
144{
145 __be32 *p;
146
147 p = read_buf(xdr, NFS4_STATEID_SIZE);
148 if (unlikely(p == NULL))
149 return htonl(NFS4ERR_RESOURCE);
150 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
151 return 0;
152}
153
154static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
155{
156 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
157 return decode_stateid(xdr, stateid);
158}
159
160static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
161{
162 __be32 *p;
163 __be32 status;
164
165 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
166 if (unlikely(status != 0))
167 return status;
168 /* We do not like overly long tags! */
169 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ) {
170 printk("NFS: NFSv4 CALLBACK %s: client sent tag of length %u\n",
171 __func__, hdr->taglen);
172 return htonl(NFS4ERR_RESOURCE);
173 }
174 p = read_buf(xdr, 12);
175 if (unlikely(p == NULL))
176 return htonl(NFS4ERR_RESOURCE);
177 hdr->minorversion = ntohl(*p++);
178 /* Check for minor version support */
179 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
180 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
181 } else {
182 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
183 "illegal minor version %u!\n",
184 __func__, hdr->minorversion);
185 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
186 }
187 hdr->nops = ntohl(*p);
188 dprintk("%s: minorversion %d nops %d\n", __func__,
189 hdr->minorversion, hdr->nops);
190 return 0;
191}
192
193static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
194{
195 __be32 *p;
196 p = read_buf(xdr, 4);
197 if (unlikely(p == NULL))
198 return htonl(NFS4ERR_RESOURCE_HDR);
199 *op = ntohl(*p);
200 return 0;
201}
202
203static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
204{
205 __be32 status;
206
207 status = decode_fh(xdr, &args->fh);
208 if (unlikely(status != 0))
209 goto out;
210 status = decode_bitmap(xdr, args->bitmap);
211out:
212 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
213 return status;
214}
215
216static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
217{
218 __be32 *p;
219 __be32 status;
220
221 status = decode_delegation_stateid(xdr, &args->stateid);
222 if (unlikely(status != 0))
223 goto out;
224 p = read_buf(xdr, 4);
225 if (unlikely(p == NULL)) {
226 status = htonl(NFS4ERR_RESOURCE);
227 goto out;
228 }
229 args->truncate = ntohl(*p);
230 status = decode_fh(xdr, &args->fh);
231out:
232 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
233 return status;
234}
235
236#if defined(CONFIG_NFS_V4_1)
237static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
238{
239 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
240 return decode_stateid(xdr, stateid);
241}
242
243static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
244 struct xdr_stream *xdr,
245 struct cb_layoutrecallargs *args)
246{
247 __be32 *p;
248 __be32 status = 0;
249 uint32_t iomode;
250
251 p = read_buf(xdr, 4 * sizeof(uint32_t));
252 if (unlikely(p == NULL)) {
253 status = htonl(NFS4ERR_BADXDR);
254 goto out;
255 }
256
257 args->cbl_layout_type = ntohl(*p++);
258 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
259 * as it is unusable and ignored with the other types.
260 */
261 iomode = ntohl(*p++);
262 args->cbl_layoutchanged = ntohl(*p++);
263 args->cbl_recall_type = ntohl(*p++);
264
265 if (args->cbl_recall_type == RETURN_FILE) {
266 args->cbl_range.iomode = iomode;
267 status = decode_fh(xdr, &args->cbl_fh);
268 if (unlikely(status != 0))
269 goto out;
270
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_range.offset);
277 p = xdr_decode_hyper(p, &args->cbl_range.length);
278 status = decode_layout_stateid(xdr, &args->cbl_stateid);
279 if (unlikely(status != 0))
280 goto out;
281 } else if (args->cbl_recall_type == RETURN_FSID) {
282 p = read_buf(xdr, 2 * sizeof(uint64_t));
283 if (unlikely(p == NULL)) {
284 status = htonl(NFS4ERR_BADXDR);
285 goto out;
286 }
287 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
288 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
289 } else if (args->cbl_recall_type != RETURN_ALL) {
290 status = htonl(NFS4ERR_BADXDR);
291 goto out;
292 }
293 dprintk("%s: ltype 0x%x iomode %d changed %d recall_type %d\n",
294 __func__,
295 args->cbl_layout_type, iomode,
296 args->cbl_layoutchanged, args->cbl_recall_type);
297out:
298 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
299 return status;
300}
301
302static
303__be32 decode_devicenotify_args(struct svc_rqst *rqstp,
304 struct xdr_stream *xdr,
305 struct cb_devicenotifyargs *args)
306{
307 __be32 *p;
308 __be32 status = 0;
309 u32 tmp;
310 int n, i;
311 args->ndevs = 0;
312
313 /* Num of device notifications */
314 p = read_buf(xdr, sizeof(uint32_t));
315 if (unlikely(p == NULL)) {
316 status = htonl(NFS4ERR_BADXDR);
317 goto out;
318 }
319 n = ntohl(*p++);
320 if (n <= 0)
321 goto out;
322 if (n > ULONG_MAX / sizeof(*args->devs)) {
323 status = htonl(NFS4ERR_BADXDR);
324 goto out;
325 }
326
327 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
328 if (!args->devs) {
329 status = htonl(NFS4ERR_DELAY);
330 goto out;
331 }
332
333 /* Decode each dev notification */
334 for (i = 0; i < n; i++) {
335 struct cb_devicenotifyitem *dev = &args->devs[i];
336
337 p = read_buf(xdr, (4 * sizeof(uint32_t)) + NFS4_DEVICEID4_SIZE);
338 if (unlikely(p == NULL)) {
339 status = htonl(NFS4ERR_BADXDR);
340 goto err;
341 }
342
343 tmp = ntohl(*p++); /* bitmap size */
344 if (tmp != 1) {
345 status = htonl(NFS4ERR_INVAL);
346 goto err;
347 }
348 dev->cbd_notify_type = ntohl(*p++);
349 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
350 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
351 status = htonl(NFS4ERR_INVAL);
352 goto err;
353 }
354
355 tmp = ntohl(*p++); /* opaque size */
356 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
357 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
358 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
359 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
360 status = htonl(NFS4ERR_INVAL);
361 goto err;
362 }
363 dev->cbd_layout_type = ntohl(*p++);
364 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
365 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
366
367 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
368 p = read_buf(xdr, sizeof(uint32_t));
369 if (unlikely(p == NULL)) {
370 status = htonl(NFS4ERR_BADXDR);
371 goto err;
372 }
373 dev->cbd_immediate = ntohl(*p++);
374 } else {
375 dev->cbd_immediate = 0;
376 }
377
378 args->ndevs++;
379
380 dprintk("%s: type %d layout 0x%x immediate %d\n",
381 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
382 dev->cbd_immediate);
383 }
384out:
385 dprintk("%s: status %d ndevs %d\n",
386 __func__, ntohl(status), args->ndevs);
387 return status;
388err:
389 kfree(args->devs);
390 goto out;
391}
392
393static __be32 decode_sessionid(struct xdr_stream *xdr,
394 struct nfs4_sessionid *sid)
395{
396 __be32 *p;
397
398 p = read_buf(xdr, NFS4_MAX_SESSIONID_LEN);
399 if (unlikely(p == NULL))
400 return htonl(NFS4ERR_RESOURCE);
401
402 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
403 return 0;
404}
405
406static __be32 decode_rc_list(struct xdr_stream *xdr,
407 struct referring_call_list *rc_list)
408{
409 __be32 *p;
410 int i;
411 __be32 status;
412
413 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
414 if (status)
415 goto out;
416
417 status = htonl(NFS4ERR_RESOURCE);
418 p = read_buf(xdr, sizeof(uint32_t));
419 if (unlikely(p == NULL))
420 goto out;
421
422 rc_list->rcl_nrefcalls = ntohl(*p++);
423 if (rc_list->rcl_nrefcalls) {
424 p = read_buf(xdr,
425 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
426 if (unlikely(p == NULL))
427 goto out;
428 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
429 sizeof(*rc_list->rcl_refcalls),
430 GFP_KERNEL);
431 if (unlikely(rc_list->rcl_refcalls == NULL))
432 goto out;
433 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
434 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
435 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
436 }
437 }
438 status = 0;
439
440out:
441 return status;
442}
443
444static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
445 struct xdr_stream *xdr,
446 struct cb_sequenceargs *args)
447{
448 __be32 *p;
449 int i;
450 __be32 status;
451
452 status = decode_sessionid(xdr, &args->csa_sessionid);
453 if (status)
454 goto out;
455
456 status = htonl(NFS4ERR_RESOURCE);
457 p = read_buf(xdr, 5 * sizeof(uint32_t));
458 if (unlikely(p == NULL))
459 goto out;
460
461 args->csa_addr = svc_addr(rqstp);
462 args->csa_sequenceid = ntohl(*p++);
463 args->csa_slotid = ntohl(*p++);
464 args->csa_highestslotid = ntohl(*p++);
465 args->csa_cachethis = ntohl(*p++);
466 args->csa_nrclists = ntohl(*p++);
467 args->csa_rclists = NULL;
468 if (args->csa_nrclists) {
469 args->csa_rclists = kmalloc_array(args->csa_nrclists,
470 sizeof(*args->csa_rclists),
471 GFP_KERNEL);
472 if (unlikely(args->csa_rclists == NULL))
473 goto out;
474
475 for (i = 0; i < args->csa_nrclists; i++) {
476 status = decode_rc_list(xdr, &args->csa_rclists[i]);
477 if (status) {
478 args->csa_nrclists = i;
479 goto out_free;
480 }
481 }
482 }
483 status = 0;
484
485 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
486 "highestslotid %u cachethis %d nrclists %u\n",
487 __func__,
488 ((u32 *)&args->csa_sessionid)[0],
489 ((u32 *)&args->csa_sessionid)[1],
490 ((u32 *)&args->csa_sessionid)[2],
491 ((u32 *)&args->csa_sessionid)[3],
492 args->csa_sequenceid, args->csa_slotid,
493 args->csa_highestslotid, args->csa_cachethis,
494 args->csa_nrclists);
495out:
496 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
497 return status;
498
499out_free:
500 for (i = 0; i < args->csa_nrclists; i++)
501 kfree(args->csa_rclists[i].rcl_refcalls);
502 kfree(args->csa_rclists);
503 goto out;
504}
505
506static __be32 decode_recallany_args(struct svc_rqst *rqstp,
507 struct xdr_stream *xdr,
508 struct cb_recallanyargs *args)
509{
510 uint32_t bitmap[2];
511 __be32 *p, status;
512
513 p = read_buf(xdr, 4);
514 if (unlikely(p == NULL))
515 return htonl(NFS4ERR_BADXDR);
516 args->craa_objs_to_keep = ntohl(*p++);
517 status = decode_bitmap(xdr, bitmap);
518 if (unlikely(status))
519 return status;
520 args->craa_type_mask = bitmap[0];
521
522 return 0;
523}
524
525static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
526 struct xdr_stream *xdr,
527 struct cb_recallslotargs *args)
528{
529 __be32 *p;
530
531 p = read_buf(xdr, 4);
532 if (unlikely(p == NULL))
533 return htonl(NFS4ERR_BADXDR);
534 args->crsa_target_highest_slotid = ntohl(*p++);
535 return 0;
536}
537
538static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
539{
540 __be32 *p;
541 unsigned int len;
542
543 p = read_buf(xdr, 12);
544 if (unlikely(p == NULL))
545 return htonl(NFS4ERR_BADXDR);
546
547 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
548 len = be32_to_cpu(*p);
549
550 p = read_buf(xdr, len);
551 if (unlikely(p == NULL))
552 return htonl(NFS4ERR_BADXDR);
553
554 /* Only try to decode if the length is right */
555 if (len == 20) {
556 p += 2; /* skip "lock id:" */
557 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
558 xdr_decode_hyper(p, &args->cbnl_owner.id);
559 args->cbnl_valid = true;
560 } else {
561 args->cbnl_owner.s_dev = 0;
562 args->cbnl_owner.id = 0;
563 args->cbnl_valid = false;
564 }
565 return 0;
566}
567
568static __be32 decode_notify_lock_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_notify_lock_args *args)
569{
570 __be32 status;
571
572 status = decode_fh(xdr, &args->cbnl_fh);
573 if (unlikely(status != 0))
574 goto out;
575 status = decode_lockowner(xdr, args);
576out:
577 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
578 return status;
579}
580
581#endif /* CONFIG_NFS_V4_1 */
582
583static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
584{
585 __be32 *p;
586
587 p = xdr_reserve_space(xdr, 4 + len);
588 if (unlikely(p == NULL))
589 return htonl(NFS4ERR_RESOURCE);
590 xdr_encode_opaque(p, str, len);
591 return 0;
592}
593
594#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
595#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
596static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
597{
598 __be32 bm[2];
599 __be32 *p;
600
601 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
602 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
603 if (bm[1] != 0) {
604 p = xdr_reserve_space(xdr, 16);
605 if (unlikely(p == NULL))
606 return htonl(NFS4ERR_RESOURCE);
607 *p++ = htonl(2);
608 *p++ = bm[0];
609 *p++ = bm[1];
610 } else if (bm[0] != 0) {
611 p = xdr_reserve_space(xdr, 12);
612 if (unlikely(p == NULL))
613 return htonl(NFS4ERR_RESOURCE);
614 *p++ = htonl(1);
615 *p++ = bm[0];
616 } else {
617 p = xdr_reserve_space(xdr, 8);
618 if (unlikely(p == NULL))
619 return htonl(NFS4ERR_RESOURCE);
620 *p++ = htonl(0);
621 }
622 *savep = p;
623 return 0;
624}
625
626static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
627{
628 __be32 *p;
629
630 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
631 return 0;
632 p = xdr_reserve_space(xdr, 8);
633 if (unlikely(!p))
634 return htonl(NFS4ERR_RESOURCE);
635 p = xdr_encode_hyper(p, change);
636 return 0;
637}
638
639static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
640{
641 __be32 *p;
642
643 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
644 return 0;
645 p = xdr_reserve_space(xdr, 8);
646 if (unlikely(!p))
647 return htonl(NFS4ERR_RESOURCE);
648 p = xdr_encode_hyper(p, size);
649 return 0;
650}
651
652static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
653{
654 __be32 *p;
655
656 p = xdr_reserve_space(xdr, 12);
657 if (unlikely(!p))
658 return htonl(NFS4ERR_RESOURCE);
659 p = xdr_encode_hyper(p, time->tv_sec);
660 *p = htonl(time->tv_nsec);
661 return 0;
662}
663
664static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
665{
666 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
667 return 0;
668 return encode_attr_time(xdr,time);
669}
670
671static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
672{
673 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
674 return 0;
675 return encode_attr_time(xdr,time);
676}
677
678static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
679{
680 __be32 status;
681
682 hdr->status = xdr_reserve_space(xdr, 4);
683 if (unlikely(hdr->status == NULL))
684 return htonl(NFS4ERR_RESOURCE);
685 status = encode_string(xdr, hdr->taglen, hdr->tag);
686 if (unlikely(status != 0))
687 return status;
688 hdr->nops = xdr_reserve_space(xdr, 4);
689 if (unlikely(hdr->nops == NULL))
690 return htonl(NFS4ERR_RESOURCE);
691 return 0;
692}
693
694static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
695{
696 __be32 *p;
697
698 p = xdr_reserve_space(xdr, 8);
699 if (unlikely(p == NULL))
700 return htonl(NFS4ERR_RESOURCE_HDR);
701 *p++ = htonl(op);
702 *p = res;
703 return 0;
704}
705
706static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
707{
708 __be32 *savep = NULL;
709 __be32 status = res->status;
710
711 if (unlikely(status != 0))
712 goto out;
713 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
714 if (unlikely(status != 0))
715 goto out;
716 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
717 if (unlikely(status != 0))
718 goto out;
719 status = encode_attr_size(xdr, res->bitmap, res->size);
720 if (unlikely(status != 0))
721 goto out;
722 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
723 if (unlikely(status != 0))
724 goto out;
725 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
726 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
727out:
728 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
729 return status;
730}
731
732#if defined(CONFIG_NFS_V4_1)
733
734static __be32 encode_sessionid(struct xdr_stream *xdr,
735 const struct nfs4_sessionid *sid)
736{
737 __be32 *p;
738
739 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
740 if (unlikely(p == NULL))
741 return htonl(NFS4ERR_RESOURCE);
742
743 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
744 return 0;
745}
746
747static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
748 struct xdr_stream *xdr,
749 const struct cb_sequenceres *res)
750{
751 __be32 *p;
752 __be32 status = res->csr_status;
753
754 if (unlikely(status != 0))
755 goto out;
756
757 status = encode_sessionid(xdr, &res->csr_sessionid);
758 if (status)
759 goto out;
760
761 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
762 if (unlikely(p == NULL))
763 return htonl(NFS4ERR_RESOURCE);
764
765 *p++ = htonl(res->csr_sequenceid);
766 *p++ = htonl(res->csr_slotid);
767 *p++ = htonl(res->csr_highestslotid);
768 *p++ = htonl(res->csr_target_highestslotid);
769out:
770 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
771 return status;
772}
773
774static __be32
775preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
776{
777 if (op_nr == OP_CB_SEQUENCE) {
778 if (nop != 0)
779 return htonl(NFS4ERR_SEQUENCE_POS);
780 } else {
781 if (nop == 0)
782 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
783 }
784
785 switch (op_nr) {
786 case OP_CB_GETATTR:
787 case OP_CB_RECALL:
788 case OP_CB_SEQUENCE:
789 case OP_CB_RECALL_ANY:
790 case OP_CB_RECALL_SLOT:
791 case OP_CB_LAYOUTRECALL:
792 case OP_CB_NOTIFY_DEVICEID:
793 case OP_CB_NOTIFY_LOCK:
794 *op = &callback_ops[op_nr];
795 break;
796
797 case OP_CB_NOTIFY:
798 case OP_CB_PUSH_DELEG:
799 case OP_CB_RECALLABLE_OBJ_AVAIL:
800 case OP_CB_WANTS_CANCELLED:
801 return htonl(NFS4ERR_NOTSUPP);
802
803 default:
804 return htonl(NFS4ERR_OP_ILLEGAL);
805 }
806
807 return htonl(NFS_OK);
808}
809
810static void nfs4_callback_free_slot(struct nfs4_session *session,
811 struct nfs4_slot *slot)
812{
813 struct nfs4_slot_table *tbl = &session->bc_slot_table;
814
815 spin_lock(&tbl->slot_tbl_lock);
816 /*
817 * Let the state manager know callback processing done.
818 * A single slot, so highest used slotid is either 0 or -1
819 */
820 nfs4_free_slot(tbl, slot);
821 nfs4_slot_tbl_drain_complete(tbl);
822 spin_unlock(&tbl->slot_tbl_lock);
823}
824
825static void nfs4_cb_free_slot(struct cb_process_state *cps)
826{
827 if (cps->slot) {
828 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
829 cps->slot = NULL;
830 }
831}
832
833#else /* CONFIG_NFS_V4_1 */
834
835static __be32
836preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
837{
838 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
839}
840
841static void nfs4_cb_free_slot(struct cb_process_state *cps)
842{
843}
844#endif /* CONFIG_NFS_V4_1 */
845
846#ifdef CONFIG_NFS_V4_2
847static __be32
848preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
849{
850 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
851 if (status != htonl(NFS4ERR_OP_ILLEGAL))
852 return status;
853
854 if (op_nr == OP_CB_OFFLOAD)
855 return htonl(NFS4ERR_NOTSUPP);
856 return htonl(NFS4ERR_OP_ILLEGAL);
857}
858#else /* CONFIG_NFS_V4_2 */
859static __be32
860preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
861{
862 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
863}
864#endif /* CONFIG_NFS_V4_2 */
865
866static __be32
867preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
868{
869 switch (op_nr) {
870 case OP_CB_GETATTR:
871 case OP_CB_RECALL:
872 *op = &callback_ops[op_nr];
873 break;
874 default:
875 return htonl(NFS4ERR_OP_ILLEGAL);
876 }
877
878 return htonl(NFS_OK);
879}
880
881static __be32 process_op(int nop, struct svc_rqst *rqstp,
882 struct xdr_stream *xdr_in, void *argp,
883 struct xdr_stream *xdr_out, void *resp,
884 struct cb_process_state *cps)
885{
886 struct callback_op *op = &callback_ops[0];
887 unsigned int op_nr;
888 __be32 status;
889 long maxlen;
890 __be32 res;
891
892 dprintk("%s: start\n", __func__);
893 status = decode_op_hdr(xdr_in, &op_nr);
894 if (unlikely(status))
895 return status;
896
897 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
898 __func__, cps->minorversion, nop, op_nr);
899
900 switch (cps->minorversion) {
901 case 0:
902 status = preprocess_nfs4_op(op_nr, &op);
903 break;
904 case 1:
905 status = preprocess_nfs41_op(nop, op_nr, &op);
906 break;
907 case 2:
908 status = preprocess_nfs42_op(nop, op_nr, &op);
909 break;
910 default:
911 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
912 }
913
914 if (status == htonl(NFS4ERR_OP_ILLEGAL))
915 op_nr = OP_CB_ILLEGAL;
916 if (status)
917 goto encode_hdr;
918
919 if (cps->drc_status) {
920 status = cps->drc_status;
921 goto encode_hdr;
922 }
923
924 maxlen = xdr_out->end - xdr_out->p;
925 if (maxlen > 0 && maxlen < PAGE_SIZE) {
926 status = op->decode_args(rqstp, xdr_in, argp);
927 if (likely(status == 0))
928 status = op->process_op(argp, resp, cps);
929 } else
930 status = htonl(NFS4ERR_RESOURCE);
931
932encode_hdr:
933 res = encode_op_hdr(xdr_out, op_nr, status);
934 if (unlikely(res))
935 return res;
936 if (op->encode_res != NULL && status == 0)
937 status = op->encode_res(rqstp, xdr_out, resp);
938 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
939 return status;
940}
941
942/*
943 * Decode, process and encode a COMPOUND
944 */
945static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
946{
947 struct cb_compound_hdr_arg hdr_arg = { 0 };
948 struct cb_compound_hdr_res hdr_res = { NULL };
949 struct xdr_stream xdr_in, xdr_out;
950 __be32 *p, status;
951 struct cb_process_state cps = {
952 .drc_status = 0,
953 .clp = NULL,
954 .net = SVC_NET(rqstp),
955 };
956 unsigned int nops = 0;
957
958 dprintk("%s: start\n", __func__);
959
960 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
961
962 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
963 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
964
965 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
966 if (status == htonl(NFS4ERR_RESOURCE))
967 return rpc_garbage_args;
968
969 if (hdr_arg.minorversion == 0) {
970 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
971 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
972 goto out_invalidcred;
973 }
974
975 cps.minorversion = hdr_arg.minorversion;
976 hdr_res.taglen = hdr_arg.taglen;
977 hdr_res.tag = hdr_arg.tag;
978 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
979 return rpc_system_err;
980
981 while (status == 0 && nops != hdr_arg.nops) {
982 status = process_op(nops, rqstp, &xdr_in,
983 argp, &xdr_out, resp, &cps);
984 nops++;
985 }
986
987 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
988 * resource error in cb_compound status without returning op */
989 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
990 status = htonl(NFS4ERR_RESOURCE);
991 nops--;
992 }
993
994 *hdr_res.status = status;
995 *hdr_res.nops = htonl(nops);
996 nfs4_cb_free_slot(&cps);
997 nfs_put_client(cps.clp);
998 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
999 return rpc_success;
1000
1001out_invalidcred:
1002 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1003 return rpc_autherr_badcred;
1004}
1005
1006/*
1007 * Define NFS4 callback COMPOUND ops.
1008 */
1009static struct callback_op callback_ops[] = {
1010 [0] = {
1011 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1012 },
1013 [OP_CB_GETATTR] = {
1014 .process_op = (callback_process_op_t)nfs4_callback_getattr,
1015 .decode_args = (callback_decode_arg_t)decode_getattr_args,
1016 .encode_res = (callback_encode_res_t)encode_getattr_res,
1017 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1018 },
1019 [OP_CB_RECALL] = {
1020 .process_op = (callback_process_op_t)nfs4_callback_recall,
1021 .decode_args = (callback_decode_arg_t)decode_recall_args,
1022 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1023 },
1024#if defined(CONFIG_NFS_V4_1)
1025 [OP_CB_LAYOUTRECALL] = {
1026 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
1027 .decode_args =
1028 (callback_decode_arg_t)decode_layoutrecall_args,
1029 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1030 },
1031 [OP_CB_NOTIFY_DEVICEID] = {
1032 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
1033 .decode_args =
1034 (callback_decode_arg_t)decode_devicenotify_args,
1035 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1036 },
1037 [OP_CB_SEQUENCE] = {
1038 .process_op = (callback_process_op_t)nfs4_callback_sequence,
1039 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
1040 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
1041 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1042 },
1043 [OP_CB_RECALL_ANY] = {
1044 .process_op = (callback_process_op_t)nfs4_callback_recallany,
1045 .decode_args = (callback_decode_arg_t)decode_recallany_args,
1046 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1047 },
1048 [OP_CB_RECALL_SLOT] = {
1049 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
1050 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
1051 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1052 },
1053 [OP_CB_NOTIFY_LOCK] = {
1054 .process_op = (callback_process_op_t)nfs4_callback_notify_lock,
1055 .decode_args = (callback_decode_arg_t)decode_notify_lock_args,
1056 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1057 },
1058#endif /* CONFIG_NFS_V4_1 */
1059};
1060
1061/*
1062 * Define NFS4 callback procedures
1063 */
1064static struct svc_procedure nfs4_callback_procedures1[] = {
1065 [CB_NULL] = {
1066 .pc_func = nfs4_callback_null,
1067 .pc_decode = (kxdrproc_t)nfs4_decode_void,
1068 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1069 .pc_xdrressize = 1,
1070 },
1071 [CB_COMPOUND] = {
1072 .pc_func = nfs4_callback_compound,
1073 .pc_encode = (kxdrproc_t)nfs4_encode_void,
1074 .pc_argsize = 256,
1075 .pc_ressize = 256,
1076 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1077 }
1078};
1079
1080struct svc_version nfs4_callback_version1 = {
1081 .vs_vers = 1,
1082 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1083 .vs_proc = nfs4_callback_procedures1,
1084 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1085 .vs_dispatch = NULL,
1086 .vs_hidden = 1,
1087};
1088
1089struct svc_version nfs4_callback_version4 = {
1090 .vs_vers = 4,
1091 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1092 .vs_proc = nfs4_callback_procedures1,
1093 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1094 .vs_dispatch = NULL,
1095 .vs_hidden = 1,
1096};
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
42typedef __be32 (*callback_process_op_t)(void *, void *,
43 struct cb_process_state *);
44typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
45typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
46
47
48struct 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
55static struct callback_op callback_ops[];
56
57static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
58{
59 return htonl(NFS4_OK);
60}
61
62static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
63{
64 return xdr_argsize_check(rqstp, p);
65}
66
67static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
68{
69 return xdr_ressize_check(rqstp, p);
70}
71
72static __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 "NFS: NFSv4 callback reply buffer overflowed!\n");
79 return p;
80}
81
82static __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
102static __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
120static __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
139static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
140{
141 __be32 *p;
142
143 p = read_buf(xdr, NFS4_STATEID_SIZE);
144 if (unlikely(p == NULL))
145 return htonl(NFS4ERR_RESOURCE);
146 memcpy(stateid, p, NFS4_STATEID_SIZE);
147 return 0;
148}
149
150static __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("NFS: 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
183static __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
193static __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);
202out:
203 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
204 return status;
205}
206
207static __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);
223out:
224 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
225 return status;
226}
227
228#if defined(CONFIG_NFS_V4_1)
229
230static __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);
285out:
286 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
287 return status;
288}
289
290static
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 }
372out:
373 dprintk("%s: status %d ndevs %d\n",
374 __func__, ntohl(status), args->ndevs);
375 return status;
376err:
377 kfree(args->devs);
378 goto out;
379}
380
381static __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
395static __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
429out:
430 return status;
431}
432
433static __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_array(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);
482out:
483 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
484 return status;
485
486out_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
493static __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
513static __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
529static __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)
542static __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
572static __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
585static __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
598static __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
610static __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
617static __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
624static __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
640static __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
652static __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)));
673out:
674 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
675 return status;
676}
677
678#if defined(CONFIG_NFS_V4_1)
679
680static __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
694static __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 __be32 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);
714out:
715 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
716 return status;
717}
718
719static __be32
720preprocess_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
755static 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 = NFS4_NO_SLOT;
765 nfs4_check_drain_bc_complete(session);
766 spin_unlock(&tbl->slot_tbl_lock);
767}
768
769static void nfs4_cb_free_slot(struct cb_process_state *cps)
770{
771 if (cps->slotid != NFS4_NO_SLOT)
772 nfs4_callback_free_slot(cps->clp->cl_session);
773}
774
775#else /* CONFIG_NFS_V4_1 */
776
777static __be32
778preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
779{
780 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
781}
782
783static void nfs4_cb_free_slot(struct cb_process_state *cps)
784{
785}
786#endif /* CONFIG_NFS_V4_1 */
787
788static __be32
789preprocess_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
803static __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
843encode_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 */
856static __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 = NFS4_NO_SLOT,
866 .net = rqstp->rq_xprt->xpt_net,
867 };
868 unsigned int nops = 0;
869
870 dprintk("%s: start\n", __func__);
871
872 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
873
874 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
875 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
876
877 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
878 if (status == __constant_htonl(NFS4ERR_RESOURCE))
879 return rpc_garbage_args;
880
881 if (hdr_arg.minorversion == 0) {
882 cps.clp = nfs4_find_client_ident(rqstp->rq_xprt->xpt_net, hdr_arg.cb_ident);
883 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
884 return rpc_drop_reply;
885 }
886
887 hdr_res.taglen = hdr_arg.taglen;
888 hdr_res.tag = hdr_arg.tag;
889 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
890 return rpc_system_err;
891
892 while (status == 0 && nops != hdr_arg.nops) {
893 status = process_op(hdr_arg.minorversion, nops, rqstp,
894 &xdr_in, argp, &xdr_out, resp, &cps);
895 nops++;
896 }
897
898 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
899 * resource error in cb_compound status without returning op */
900 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
901 status = htonl(NFS4ERR_RESOURCE);
902 nops--;
903 }
904
905 *hdr_res.status = status;
906 *hdr_res.nops = htonl(nops);
907 nfs4_cb_free_slot(&cps);
908 nfs_put_client(cps.clp);
909 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
910 return rpc_success;
911}
912
913/*
914 * Define NFS4 callback COMPOUND ops.
915 */
916static struct callback_op callback_ops[] = {
917 [0] = {
918 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
919 },
920 [OP_CB_GETATTR] = {
921 .process_op = (callback_process_op_t)nfs4_callback_getattr,
922 .decode_args = (callback_decode_arg_t)decode_getattr_args,
923 .encode_res = (callback_encode_res_t)encode_getattr_res,
924 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
925 },
926 [OP_CB_RECALL] = {
927 .process_op = (callback_process_op_t)nfs4_callback_recall,
928 .decode_args = (callback_decode_arg_t)decode_recall_args,
929 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
930 },
931#if defined(CONFIG_NFS_V4_1)
932 [OP_CB_LAYOUTRECALL] = {
933 .process_op = (callback_process_op_t)nfs4_callback_layoutrecall,
934 .decode_args =
935 (callback_decode_arg_t)decode_layoutrecall_args,
936 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
937 },
938 [OP_CB_NOTIFY_DEVICEID] = {
939 .process_op = (callback_process_op_t)nfs4_callback_devicenotify,
940 .decode_args =
941 (callback_decode_arg_t)decode_devicenotify_args,
942 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
943 },
944 [OP_CB_SEQUENCE] = {
945 .process_op = (callback_process_op_t)nfs4_callback_sequence,
946 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
947 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
948 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
949 },
950 [OP_CB_RECALL_ANY] = {
951 .process_op = (callback_process_op_t)nfs4_callback_recallany,
952 .decode_args = (callback_decode_arg_t)decode_recallany_args,
953 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
954 },
955 [OP_CB_RECALL_SLOT] = {
956 .process_op = (callback_process_op_t)nfs4_callback_recallslot,
957 .decode_args = (callback_decode_arg_t)decode_recallslot_args,
958 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
959 },
960#endif /* CONFIG_NFS_V4_1 */
961};
962
963/*
964 * Define NFS4 callback procedures
965 */
966static struct svc_procedure nfs4_callback_procedures1[] = {
967 [CB_NULL] = {
968 .pc_func = nfs4_callback_null,
969 .pc_decode = (kxdrproc_t)nfs4_decode_void,
970 .pc_encode = (kxdrproc_t)nfs4_encode_void,
971 .pc_xdrressize = 1,
972 },
973 [CB_COMPOUND] = {
974 .pc_func = nfs4_callback_compound,
975 .pc_encode = (kxdrproc_t)nfs4_encode_void,
976 .pc_argsize = 256,
977 .pc_ressize = 256,
978 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
979 }
980};
981
982struct svc_version nfs4_callback_version1 = {
983 .vs_vers = 1,
984 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
985 .vs_proc = nfs4_callback_procedures1,
986 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
987 .vs_dispatch = NULL,
988 .vs_hidden = 1,
989};
990
991struct svc_version nfs4_callback_version4 = {
992 .vs_vers = 4,
993 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
994 .vs_proc = nfs4_callback_procedures1,
995 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
996 .vs_dispatch = NULL,
997 .vs_hidden = 1,
998};