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nfs41: back channel drc minimal implementation
[linux-2.6-block.git] / fs / nfs / callback_xdr.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/callback_xdr.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback encode/decode procedures
7 */
1da177e4
LT		 8#include <linux/kernel.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/nfs4.h>
11#include <linux/nfs_fs.h>
4ce79717 12#include "nfs4_fs.h"
1da177e4
LT		 13#include "callback.h"
14
15#define CB_OP_TAGLEN_MAXSZ (512)
16#define CB_OP_HDR_RES_MAXSZ (2 + CB_OP_TAGLEN_MAXSZ)
17#define CB_OP_GETATTR_BITMAP_MAXSZ (4)
18#define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
19 CB_OP_GETATTR_BITMAP_MAXSZ + \
20 2 + 2 + 3 + 3)
21#define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
22
4aece6a1
BH		 23#if defined(CONFIG_NFS_V4_1)
24#define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
25 4 + 1 + 3)
31f09607 26#define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
4aece6a1
BH		 27#endif /* CONFIG_NFS_V4_1 */
28
1da177e4
LT		 29#define NFSDBG_FACILITY NFSDBG_CALLBACK
30
31d2b435
AA		 31/* Internal error code */
32#define NFS4ERR_RESOURCE_HDR 11050
33
e6f684f6
AV		 34typedef __be32 (*callback_process_op_t)(void *, void *);
35typedef __be32 (*callback_decode_arg_t)(struct svc_rqst *, struct xdr_stream *, void *);
36typedef __be32 (*callback_encode_res_t)(struct svc_rqst *, struct xdr_stream *, void *);
1da177e4
LT		 37
38
39struct callback_op {
40 callback_process_op_t process_op;
41 callback_decode_arg_t decode_args;
42 callback_encode_res_t encode_res;
43 long res_maxsize;
44};
45
46static struct callback_op callback_ops[];
47
7111c66e 48static __be32 nfs4_callback_null(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4
LT		 49{
50 return htonl(NFS4_OK);
51}
52
5704fdeb 53static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 54{
55 return xdr_argsize_check(rqstp, p);
56}
57
5704fdeb 58static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
1da177e4
LT		 59{
60 return xdr_ressize_check(rqstp, p);
61}
62
5704fdeb 63static __be32 *read_buf(struct xdr_stream *xdr, int nbytes)
1da177e4 64{
5704fdeb 65 __be32 *p;
1da177e4
LT		 66
67 p = xdr_inline_decode(xdr, nbytes);
68 if (unlikely(p == NULL))
69 printk(KERN_WARNING "NFSv4 callback reply buffer overflowed!\n");
70 return p;
71}
72
e6f684f6 73static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len, const char **str)
1da177e4 74{
5704fdeb 75 __be32 *p;
1da177e4
LT		 76
77 p = read_buf(xdr, 4);
78 if (unlikely(p == NULL))
79 return htonl(NFS4ERR_RESOURCE);
80 *len = ntohl(*p);
81
82 if (*len != 0) {
83 p = read_buf(xdr, *len);
84 if (unlikely(p == NULL))
85 return htonl(NFS4ERR_RESOURCE);
86 *str = (const char *)p;
87 } else
88 *str = NULL;
89
90 return 0;
91}
92
e6f684f6 93static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
1da177e4 94{
5704fdeb 95 __be32 *p;
1da177e4
LT		 96
97 p = read_buf(xdr, 4);
98 if (unlikely(p == NULL))
99 return htonl(NFS4ERR_RESOURCE);
100 fh->size = ntohl(*p);
101 if (fh->size > NFS4_FHSIZE)
102 return htonl(NFS4ERR_BADHANDLE);
103 p = read_buf(xdr, fh->size);
104 if (unlikely(p == NULL))
105 return htonl(NFS4ERR_RESOURCE);
106 memcpy(&fh->data[0], p, fh->size);
107 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
108 return 0;
109}
110
e6f684f6 111static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
1da177e4 112{
5704fdeb 113 __be32 *p;
1da177e4
LT		 114 unsigned int attrlen;
115
116 p = read_buf(xdr, 4);
117 if (unlikely(p == NULL))
118 return htonl(NFS4ERR_RESOURCE);
119 attrlen = ntohl(*p);
120 p = read_buf(xdr, attrlen << 2);
121 if (unlikely(p == NULL))
122 return htonl(NFS4ERR_RESOURCE);
123 if (likely(attrlen > 0))
124 bitmap[0] = ntohl(*p++);
125 if (attrlen > 1)
126 bitmap[1] = ntohl(*p);
127 return 0;
128}
129
e6f684f6 130static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
1da177e4 131{
5704fdeb 132 __be32 *p;
1da177e4
LT		 133
134 p = read_buf(xdr, 16);
135 if (unlikely(p == NULL))
136 return htonl(NFS4ERR_RESOURCE);
137 memcpy(stateid->data, p, 16);
138 return 0;
139}
140
e6f684f6 141static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
1da177e4 142{
5704fdeb 143 __be32 *p;
e6f684f6 144 __be32 status;
1da177e4
LT		 145
146 status = decode_string(xdr, &hdr->taglen, &hdr->tag);
147 if (unlikely(status != 0))
148 return status;
149 /* We do not like overly long tags! */
5cce428d 150 if (hdr->taglen > CB_OP_TAGLEN_MAXSZ - 12) {
1da177e4 151 printk("NFSv4 CALLBACK %s: client sent tag of length %u\n",
3110ff80 152 __func__, hdr->taglen);
1da177e4
LT		 153 return htonl(NFS4ERR_RESOURCE);
154 }
155 p = read_buf(xdr, 12);
156 if (unlikely(p == NULL))
157 return htonl(NFS4ERR_RESOURCE);
b8f2ef84 158 hdr->minorversion = ntohl(*p++);
48a9e2d2
BH		 159 /* Check minor version is zero or one. */
160 if (hdr->minorversion <= 1) {
161 p++; /* skip callback_ident */
162 } else {
b8f2ef84
BH		 163 printk(KERN_WARNING "%s: NFSv4 server callback with "
164 "illegal minor version %u!\n",
165 __func__, hdr->minorversion);
1da177e4
LT		 166 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
167 }
1da177e4 168 hdr->nops = ntohl(*p);
b8f2ef84
BH		 169 dprintk("%s: minorversion %d nops %d\n", __func__,
170 hdr->minorversion, hdr->nops);
1da177e4
LT		 171 return 0;
172}
173
e6f684f6 174static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
1da177e4 175{
5704fdeb 176 __be32 *p;
1da177e4
LT		 177 p = read_buf(xdr, 4);
178 if (unlikely(p == NULL))
31d2b435 179 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 180 *op = ntohl(*p);
181 return 0;
182}
183
e6f684f6 184static __be32 decode_getattr_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_getattrargs *args)
1da177e4 185{
e6f684f6 186 __be32 status;
1da177e4
LT		 187
188 status = decode_fh(xdr, &args->fh);
189 if (unlikely(status != 0))
190 goto out;
671beed7 191 args->addr = svc_addr(rqstp);
1da177e4
LT		 192 status = decode_bitmap(xdr, args->bitmap);
193out:
3110ff80 194 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 195 return status;
196}
197
e6f684f6 198static __be32 decode_recall_args(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct cb_recallargs *args)
1da177e4 199{
5704fdeb 200 __be32 *p;
e6f684f6 201 __be32 status;
1da177e4 202
c1d35866 203 args->addr = svc_addr(rqstp);
1da177e4
LT		 204 status = decode_stateid(xdr, &args->stateid);
205 if (unlikely(status != 0))
206 goto out;
207 p = read_buf(xdr, 4);
208 if (unlikely(p == NULL)) {
209 status = htonl(NFS4ERR_RESOURCE);
210 goto out;
211 }
212 args->truncate = ntohl(*p);
213 status = decode_fh(xdr, &args->fh);
214out:
3110ff80 215 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
3873bc50 216 return status;
1da177e4
LT		 217}
218
4aece6a1
BH		 219#if defined(CONFIG_NFS_V4_1)
220
221static unsigned decode_sessionid(struct xdr_stream *xdr,
222 struct nfs4_sessionid *sid)
223{
224 uint32_t *p;
225 int len = NFS4_MAX_SESSIONID_LEN;
226
227 p = read_buf(xdr, len);
228 if (unlikely(p == NULL))
a419aef8 229 return htonl(NFS4ERR_RESOURCE);
4aece6a1
BH		 230
231 memcpy(sid->data, p, len);
232 return 0;
233}
234
235static unsigned decode_rc_list(struct xdr_stream *xdr,
236 struct referring_call_list *rc_list)
237{
238 uint32_t *p;
239 int i;
240 unsigned status;
241
242 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
243 if (status)
244 goto out;
245
246 status = htonl(NFS4ERR_RESOURCE);
247 p = read_buf(xdr, sizeof(uint32_t));
248 if (unlikely(p == NULL))
249 goto out;
250
251 rc_list->rcl_nrefcalls = ntohl(*p++);
252 if (rc_list->rcl_nrefcalls) {
253 p = read_buf(xdr,
254 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
255 if (unlikely(p == NULL))
256 goto out;
257 rc_list->rcl_refcalls = kmalloc(rc_list->rcl_nrefcalls *
258 sizeof(*rc_list->rcl_refcalls),
259 GFP_KERNEL);
260 if (unlikely(rc_list->rcl_refcalls == NULL))
261 goto out;
262 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
263 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
264 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
265 }
266 }
267 status = 0;
268
269out:
270 return status;
271}
272
273static unsigned decode_cb_sequence_args(struct svc_rqst *rqstp,
274 struct xdr_stream *xdr,
275 struct cb_sequenceargs *args)
276{
277 uint32_t *p;
278 int i;
279 unsigned status;
280
281 status = decode_sessionid(xdr, &args->csa_sessionid);
282 if (status)
283 goto out;
284
285 status = htonl(NFS4ERR_RESOURCE);
286 p = read_buf(xdr, 5 * sizeof(uint32_t));
287 if (unlikely(p == NULL))
288 goto out;
289
65fc64e5 290 args->csa_addr = svc_addr(rqstp);
4aece6a1
BH		 291 args->csa_sequenceid = ntohl(*p++);
292 args->csa_slotid = ntohl(*p++);
293 args->csa_highestslotid = ntohl(*p++);
294 args->csa_cachethis = ntohl(*p++);
295 args->csa_nrclists = ntohl(*p++);
296 args->csa_rclists = NULL;
297 if (args->csa_nrclists) {
298 args->csa_rclists = kmalloc(args->csa_nrclists *
299 sizeof(*args->csa_rclists),
300 GFP_KERNEL);
301 if (unlikely(args->csa_rclists == NULL))
302 goto out;
303
304 for (i = 0; i < args->csa_nrclists; i++) {
305 status = decode_rc_list(xdr, &args->csa_rclists[i]);
306 if (status)
307 goto out_free;
308 }
309 }
310 status = 0;
311
312 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u slotid %u "
313 "highestslotid %u cachethis %d nrclists %u\n",
314 __func__,
315 ((u32 *)&args->csa_sessionid)[0],
316 ((u32 *)&args->csa_sessionid)[1],
317 ((u32 *)&args->csa_sessionid)[2],
318 ((u32 *)&args->csa_sessionid)[3],
319 args->csa_sequenceid, args->csa_slotid,
320 args->csa_highestslotid, args->csa_cachethis,
321 args->csa_nrclists);
322out:
323 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
324 return status;
325
326out_free:
327 for (i = 0; i < args->csa_nrclists; i++)
328 kfree(args->csa_rclists[i].rcl_refcalls);
329 kfree(args->csa_rclists);
330 goto out;
331}
332
31f09607
AB		 333static unsigned decode_recallany_args(struct svc_rqst *rqstp,
334 struct xdr_stream *xdr,
335 struct cb_recallanyargs *args)
336{
337 uint32_t *p;
338
339 args->craa_addr = svc_addr(rqstp);
340 p = read_buf(xdr, 4);
341 if (unlikely(p == NULL))
342 return htonl(NFS4ERR_BADXDR);
343 args->craa_objs_to_keep = ntohl(*p++);
344 p = read_buf(xdr, 4);
345 if (unlikely(p == NULL))
346 return htonl(NFS4ERR_BADXDR);
347 args->craa_type_mask = ntohl(*p);
348
349 return 0;
350}
351
4aece6a1
BH		 352#endif /* CONFIG_NFS_V4_1 */
353
e6f684f6 354static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
1da177e4 355{
5704fdeb 356 __be32 *p;
1da177e4
LT		 357
358 p = xdr_reserve_space(xdr, 4 + len);
359 if (unlikely(p == NULL))
360 return htonl(NFS4ERR_RESOURCE);
361 xdr_encode_opaque(p, str, len);
362 return 0;
363}
364
365#define CB_SUPPORTED_ATTR0 (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE)
366#define CB_SUPPORTED_ATTR1 (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY)
5704fdeb 367static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, __be32 **savep)
1da177e4 368{
5704fdeb
AV		 369 __be32 bm[2];
370 __be32 *p;
1da177e4
LT		 371
372 bm[0] = htonl(bitmap[0] & CB_SUPPORTED_ATTR0);
373 bm[1] = htonl(bitmap[1] & CB_SUPPORTED_ATTR1);
374 if (bm[1] != 0) {
375 p = xdr_reserve_space(xdr, 16);
376 if (unlikely(p == NULL))
377 return htonl(NFS4ERR_RESOURCE);
378 *p++ = htonl(2);
379 *p++ = bm[0];
380 *p++ = bm[1];
381 } else if (bm[0] != 0) {
382 p = xdr_reserve_space(xdr, 12);
383 if (unlikely(p == NULL))
384 return htonl(NFS4ERR_RESOURCE);
385 *p++ = htonl(1);
386 *p++ = bm[0];
387 } else {
388 p = xdr_reserve_space(xdr, 8);
389 if (unlikely(p == NULL))
390 return htonl(NFS4ERR_RESOURCE);
391 *p++ = htonl(0);
392 }
393 *savep = p;
394 return 0;
395}
396
e6f684f6 397static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
1da177e4 398{
5704fdeb 399 __be32 *p;
1da177e4
LT		 400
401 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
402 return 0;
403 p = xdr_reserve_space(xdr, 8);
90dc7d27 404 if (unlikely(!p))
1da177e4
LT		 405 return htonl(NFS4ERR_RESOURCE);
406 p = xdr_encode_hyper(p, change);
407 return 0;
408}
409
e6f684f6 410static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
1da177e4 411{
5704fdeb 412 __be32 *p;
1da177e4
LT		 413
414 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
415 return 0;
416 p = xdr_reserve_space(xdr, 8);
90dc7d27 417 if (unlikely(!p))
1da177e4
LT		 418 return htonl(NFS4ERR_RESOURCE);
419 p = xdr_encode_hyper(p, size);
420 return 0;
421}
422
e6f684f6 423static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
1da177e4 424{
5704fdeb 425 __be32 *p;
1da177e4
LT		 426
427 p = xdr_reserve_space(xdr, 12);
90dc7d27 428 if (unlikely(!p))
1da177e4
LT		 429 return htonl(NFS4ERR_RESOURCE);
430 p = xdr_encode_hyper(p, time->tv_sec);
431 *p = htonl(time->tv_nsec);
432 return 0;
433}
434
e6f684f6 435static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 436{
437 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
438 return 0;
439 return encode_attr_time(xdr,time);
440}
441
e6f684f6 442static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
1da177e4
LT		 443{
444 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
445 return 0;
446 return encode_attr_time(xdr,time);
447}
448
e6f684f6 449static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
1da177e4 450{
e6f684f6 451 __be32 status;
1da177e4
LT		 452
453 hdr->status = xdr_reserve_space(xdr, 4);
454 if (unlikely(hdr->status == NULL))
455 return htonl(NFS4ERR_RESOURCE);
456 status = encode_string(xdr, hdr->taglen, hdr->tag);
457 if (unlikely(status != 0))
458 return status;
459 hdr->nops = xdr_reserve_space(xdr, 4);
460 if (unlikely(hdr->nops == NULL))
461 return htonl(NFS4ERR_RESOURCE);
462 return 0;
463}
464
e6f684f6 465static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
1da177e4 466{
5704fdeb 467 __be32 *p;
1da177e4
LT		 468
469 p = xdr_reserve_space(xdr, 8);
470 if (unlikely(p == NULL))
31d2b435 471 return htonl(NFS4ERR_RESOURCE_HDR);
1da177e4
LT		 472 *p++ = htonl(op);
473 *p = res;
474 return 0;
475}
476
e6f684f6 477static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct cb_getattrres *res)
1da177e4 478{
5704fdeb 479 __be32 *savep = NULL;
e6f684f6 480 __be32 status = res->status;
1da177e4
LT		 481
482 if (unlikely(status != 0))
483 goto out;
484 status = encode_attr_bitmap(xdr, res->bitmap, &savep);
485 if (unlikely(status != 0))
486 goto out;
487 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
488 if (unlikely(status != 0))
489 goto out;
490 status = encode_attr_size(xdr, res->bitmap, res->size);
491 if (unlikely(status != 0))
492 goto out;
493 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
494 if (unlikely(status != 0))
495 goto out;
496 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
497 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
498out:
3110ff80 499 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
1da177e4
LT		 500 return status;
501}
502
34bc47c9
BH		 503#if defined(CONFIG_NFS_V4_1)
504
4aece6a1
BH		 505static unsigned encode_sessionid(struct xdr_stream *xdr,
506 const struct nfs4_sessionid *sid)
507{
508 uint32_t *p;
509 int len = NFS4_MAX_SESSIONID_LEN;
510
511 p = xdr_reserve_space(xdr, len);
512 if (unlikely(p == NULL))
513 return htonl(NFS4ERR_RESOURCE);
514
515 memcpy(p, sid, len);
516 return 0;
517}
518
519static unsigned encode_cb_sequence_res(struct svc_rqst *rqstp,
520 struct xdr_stream *xdr,
521 const struct cb_sequenceres *res)
522{
523 uint32_t *p;
524 unsigned status = res->csr_status;
525
526 if (unlikely(status != 0))
527 goto out;
528
529 encode_sessionid(xdr, &res->csr_sessionid);
530
531 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
532 if (unlikely(p == NULL))
533 return htonl(NFS4ERR_RESOURCE);
534
535 *p++ = htonl(res->csr_sequenceid);
536 *p++ = htonl(res->csr_slotid);
537 *p++ = htonl(res->csr_highestslotid);
538 *p++ = htonl(res->csr_target_highestslotid);
539out:
540 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
541 return status;
542}
543
34bc47c9
BH		 544static __be32
545preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
546{
281fe15d
BH		 547 if (op_nr == OP_CB_SEQUENCE) {
548 if (nop != 0)
549 return htonl(NFS4ERR_SEQUENCE_POS);
550 } else {
551 if (nop == 0)
552 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
553 }
554
34bc47c9
BH		 555 switch (op_nr) {
556 case OP_CB_GETATTR:
557 case OP_CB_RECALL:
4aece6a1 558 case OP_CB_SEQUENCE:
31f09607 559 case OP_CB_RECALL_ANY:
34bc47c9
BH		 560 *op = &callback_ops[op_nr];
561 break;
562
563 case OP_CB_LAYOUTRECALL:
564 case OP_CB_NOTIFY_DEVICEID:
565 case OP_CB_NOTIFY:
566 case OP_CB_PUSH_DELEG:
34bc47c9
BH		 567 case OP_CB_RECALLABLE_OBJ_AVAIL:
568 case OP_CB_RECALL_SLOT:
34bc47c9
BH		 569 case OP_CB_WANTS_CANCELLED:
570 case OP_CB_NOTIFY_LOCK:
571 return htonl(NFS4ERR_NOTSUPP);
572
573 default:
574 return htonl(NFS4ERR_OP_ILLEGAL);
575 }
576
577 return htonl(NFS_OK);
578}
579
580#else /* CONFIG_NFS_V4_1 */
581
582static __be32
583preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
584{
585 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
586}
587
588#endif /* CONFIG_NFS_V4_1 */
589
590static __be32
591preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
592{
593 switch (op_nr) {
594 case OP_CB_GETATTR:
595 case OP_CB_RECALL:
596 *op = &callback_ops[op_nr];
597 break;
598 default:
599 return htonl(NFS4ERR_OP_ILLEGAL);
600 }
601
602 return htonl(NFS_OK);
603}
604
605static __be32 process_op(uint32_t minorversion, int nop,
606 struct svc_rqst *rqstp,
1da177e4 607 struct xdr_stream *xdr_in, void *argp,
4911096f 608 struct xdr_stream *xdr_out, void *resp, int* drc_status)
1da177e4 609{
a162a6b8 610 struct callback_op *op = &callback_ops[0];
31d2b435 611 unsigned int op_nr;
34bc47c9 612 __be32 status;
1da177e4 613 long maxlen;
e6f684f6 614 __be32 res;
1da177e4 615
3110ff80 616 dprintk("%s: start\n", __func__);
1da177e4 617 status = decode_op_hdr(xdr_in, &op_nr);
31d2b435
AA		 618 if (unlikely(status))
619 return status;
1da177e4 620
34bc47c9
BH		 621 dprintk("%s: minorversion=%d nop=%d op_nr=%u\n",
622 __func__, minorversion, nop, op_nr);
623
624 status = minorversion ? preprocess_nfs41_op(nop, op_nr, &op) :
625 preprocess_nfs4_op(op_nr, &op);
626 if (status == htonl(NFS4ERR_OP_ILLEGAL))
627 op_nr = OP_CB_ILLEGAL;
b92b3019
AA		 628 if (status)
629 goto encode_hdr;
31d2b435 630
4911096f
AA		 631 if (*drc_status) {
632 status = *drc_status;
633 goto encode_hdr;
634 }
635
1da177e4
LT		 636 maxlen = xdr_out->end - xdr_out->p;
637 if (maxlen > 0 && maxlen < PAGE_SIZE) {
e95e60da
AA		 638 status = op->decode_args(rqstp, xdr_in, argp);
639 if (likely(status == 0))
1da177e4
LT		 640 status = op->process_op(argp, resp);
641 } else
642 status = htonl(NFS4ERR_RESOURCE);
643
4911096f
AA		 644 /* Only set by OP_CB_SEQUENCE processing */
645 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
646 *drc_status = status;
647 status = 0;
648 }
649
b92b3019 650encode_hdr:
1da177e4 651 res = encode_op_hdr(xdr_out, op_nr, status);
31d2b435
AA		 652 if (unlikely(res))
653 return res;
1da177e4
LT		 654 if (op->encode_res != NULL && status == 0)
655 status = op->encode_res(rqstp, xdr_out, resp);
3110ff80 656 dprintk("%s: done, status = %d\n", __func__, ntohl(status));
1da177e4
LT		 657 return status;
658}
659
660/*
661 * Decode, process and encode a COMPOUND
662 */
7111c66e 663static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
1da177e4 664{
3a6258e1
TM		 665 struct cb_compound_hdr_arg hdr_arg = { 0 };
666 struct cb_compound_hdr_res hdr_res = { NULL };
1da177e4 667 struct xdr_stream xdr_in, xdr_out;
5704fdeb 668 __be32 *p;
4911096f 669 __be32 status, drc_status = 0;
3a6258e1 670 unsigned int nops = 0;
1da177e4 671
3110ff80 672 dprintk("%s: start\n", __func__);
1da177e4
LT		 673
674 xdr_init_decode(&xdr_in, &rqstp->rq_arg, rqstp->rq_arg.head[0].iov_base);
675
5704fdeb 676 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
1da177e4
LT		 677 xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
678
3a6258e1
TM		 679 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
680 if (status == __constant_htonl(NFS4ERR_RESOURCE))
681 return rpc_garbage_args;
682
1da177e4
LT		 683 hdr_res.taglen = hdr_arg.taglen;
684 hdr_res.tag = hdr_arg.tag;
3a6258e1
TM		 685 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
686 return rpc_system_err;
1da177e4 687
3a6258e1 688 while (status == 0 && nops != hdr_arg.nops) {
4911096f
AA		 689 status = process_op(hdr_arg.minorversion, nops, rqstp,
690 &xdr_in, argp, &xdr_out, resp, &drc_status);
1da177e4
LT		 691 nops++;
692 }
3a6258e1 693
31d2b435
AA		 694 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
695 * resource error in cb_compound status without returning op */
696 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
697 status = htonl(NFS4ERR_RESOURCE);
698 nops--;
699 }
700
1da177e4
LT		 701 *hdr_res.status = status;
702 *hdr_res.nops = htonl(nops);
3110ff80 703 dprintk("%s: done, status = %u\n", __func__, ntohl(status));
1da177e4
LT		 704 return rpc_success;
705}
706
707/*
708 * Define NFS4 callback COMPOUND ops.
709 */
710static struct callback_op callback_ops[] = {
711 [0] = {
712 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
713 },
714 [OP_CB_GETATTR] = {
715 .process_op = (callback_process_op_t)nfs4_callback_getattr,
716 .decode_args = (callback_decode_arg_t)decode_getattr_args,
717 .encode_res = (callback_encode_res_t)encode_getattr_res,
718 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
719 },
720 [OP_CB_RECALL] = {
721 .process_op = (callback_process_op_t)nfs4_callback_recall,
722 .decode_args = (callback_decode_arg_t)decode_recall_args,
723 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
4aece6a1
BH		 724 },
725#if defined(CONFIG_NFS_V4_1)
726 [OP_CB_SEQUENCE] = {
727 .process_op = (callback_process_op_t)nfs4_callback_sequence,
728 .decode_args = (callback_decode_arg_t)decode_cb_sequence_args,
729 .encode_res = (callback_encode_res_t)encode_cb_sequence_res,
730 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
731 },
31f09607
AB		 732 [OP_CB_RECALL_ANY] = {
733 .process_op = (callback_process_op_t)nfs4_callback_recallany,
734 .decode_args = (callback_decode_arg_t)decode_recallany_args,
735 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
736 },
4aece6a1 737#endif /* CONFIG_NFS_V4_1 */
1da177e4
LT		 738};
739
740/*
741 * Define NFS4 callback procedures
742 */
743static struct svc_procedure nfs4_callback_procedures1[] = {
744 [CB_NULL] = {
745 .pc_func = nfs4_callback_null,
746 .pc_decode = (kxdrproc_t)nfs4_decode_void,
747 .pc_encode = (kxdrproc_t)nfs4_encode_void,
748 .pc_xdrressize = 1,
749 },
750 [CB_COMPOUND] = {
751 .pc_func = nfs4_callback_compound,
752 .pc_encode = (kxdrproc_t)nfs4_encode_void,
753 .pc_argsize = 256,
754 .pc_ressize = 256,
755 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
756 }
757};
758
759struct svc_version nfs4_callback_version1 = {
760 .vs_vers = 1,
761 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
762 .vs_proc = nfs4_callback_procedures1,
763 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
764 .vs_dispatch = NULL,
765};
766
07bccc2d
AB		 767struct svc_version nfs4_callback_version4 = {
768 .vs_vers = 4,
769 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
770 .vs_proc = nfs4_callback_procedures1,
771 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
772 .vs_dispatch = NULL,
773};
Linux 6.x block layer and io_uring tree(s)