1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/nfs/callback_xdr.c
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback encode/decode procedures
8 */
9 #include <linux/kernel.h>
10 #include <linux/sunrpc/svc.h>
11 #include <linux/nfs4.h>
12 #include <linux/nfs_fs.h>
13 #include <linux/ratelimit.h>
14 #include <linux/printk.h>
15 #include <linux/slab.h>
16 #include <linux/sunrpc/bc_xprt.h>
17 #include "nfs4_fs.h"
18 #include "callback.h"
19 #include "internal.h"
20 #include "nfs4session.h"
21
22 #define CB_OP_TAGLEN_MAXSZ (512)
23 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
24 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
25 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
26 CB_OP_GETATTR_BITMAP_MAXSZ + \
27 /* change, size, ctime, mtime */\
28 (2 + 2 + 3 + 3) * 4)
29 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
30
31 #if defined(CONFIG_NFS_V4_1)
32 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
33 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
35 NFS4_MAX_SESSIONID_LEN + \
36 (1 + 3) * 4) // seqid, 3 slotids
37 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
38 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40 #endif /* CONFIG_NFS_V4_1 */
41 #ifdef CONFIG_NFS_V4_2
42 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
43 #endif /* CONFIG_NFS_V4_2 */
44
45 #define NFSDBG_FACILITY NFSDBG_CALLBACK
46
47 /* Internal error code */
48 #define NFS4ERR_RESOURCE_HDR 11050
49
50 struct callback_op {
51 __be32 (*process_op)(void *, void *, struct cb_process_state *);
52 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
53 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
54 const void *);
55 long res_maxsize;
56 };
57
58 static struct callback_op callback_ops[];
59
nfs4_callback_null(struct svc_rqst * rqstp)60 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
61 {
62 return htonl(NFS4_OK);
63 }
64
nfs4_decode_void(struct svc_rqst * rqstp,__be32 * p)65 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
66 {
67 return xdr_argsize_check(rqstp, p);
68 }
69
nfs4_encode_void(struct svc_rqst * rqstp,__be32 * p)70 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
71 {
72 return xdr_ressize_check(rqstp, p);
73 }
74
decode_string(struct xdr_stream * xdr,unsigned int * len,const char ** str,size_t maxlen)75 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
76 const char **str, size_t maxlen)
77 {
78 ssize_t err;
79
80 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
81 if (err < 0)
82 return cpu_to_be32(NFS4ERR_RESOURCE);
83 *len = err;
84 return 0;
85 }
86
decode_fh(struct xdr_stream * xdr,struct nfs_fh * fh)87 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
88 {
89 __be32 *p;
90
91 p = xdr_inline_decode(xdr, 4);
92 if (unlikely(p == NULL))
93 return htonl(NFS4ERR_RESOURCE);
94 fh->size = ntohl(*p);
95 if (fh->size > NFS4_FHSIZE)
96 return htonl(NFS4ERR_BADHANDLE);
97 p = xdr_inline_decode(xdr, fh->size);
98 if (unlikely(p == NULL))
99 return htonl(NFS4ERR_RESOURCE);
100 memcpy(&fh->data[0], p, fh->size);
101 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
102 return 0;
103 }
104
decode_bitmap(struct xdr_stream * xdr,uint32_t * bitmap)105 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
106 {
107 __be32 *p;
108 unsigned int attrlen;
109
110 p = xdr_inline_decode(xdr, 4);
111 if (unlikely(p == NULL))
112 return htonl(NFS4ERR_RESOURCE);
113 attrlen = ntohl(*p);
114 p = xdr_inline_decode(xdr, attrlen << 2);
115 if (unlikely(p == NULL))
116 return htonl(NFS4ERR_RESOURCE);
117 if (likely(attrlen > 0))
118 bitmap[0] = ntohl(*p++);
119 if (attrlen > 1)
120 bitmap[1] = ntohl(*p);
121 return 0;
122 }
123
decode_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)124 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
125 {
126 __be32 *p;
127
128 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
129 if (unlikely(p == NULL))
130 return htonl(NFS4ERR_RESOURCE);
131 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
132 return 0;
133 }
134
decode_delegation_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)135 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
136 {
137 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
138 return decode_stateid(xdr, stateid);
139 }
140
decode_compound_hdr_arg(struct xdr_stream * xdr,struct cb_compound_hdr_arg * hdr)141 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
142 {
143 __be32 *p;
144 __be32 status;
145
146 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
147 if (unlikely(status != 0))
148 return status;
149 p = xdr_inline_decode(xdr, 12);
150 if (unlikely(p == NULL))
151 return htonl(NFS4ERR_RESOURCE);
152 hdr->minorversion = ntohl(*p++);
153 /* Check for minor version support */
154 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
155 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
156 } else {
157 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
158 "illegal minor version %u!\n",
159 __func__, hdr->minorversion);
160 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
161 }
162 hdr->nops = ntohl(*p);
163 return 0;
164 }
165
decode_op_hdr(struct xdr_stream * xdr,unsigned int * op)166 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
167 {
168 __be32 *p;
169 p = xdr_inline_decode(xdr, 4);
170 if (unlikely(p == NULL))
171 return htonl(NFS4ERR_RESOURCE_HDR);
172 *op = ntohl(*p);
173 return 0;
174 }
175
decode_getattr_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)176 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
177 struct xdr_stream *xdr, void *argp)
178 {
179 struct cb_getattrargs *args = argp;
180 __be32 status;
181
182 status = decode_fh(xdr, &args->fh);
183 if (unlikely(status != 0))
184 return status;
185 return decode_bitmap(xdr, args->bitmap);
186 }
187
decode_recall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)188 static __be32 decode_recall_args(struct svc_rqst *rqstp,
189 struct xdr_stream *xdr, void *argp)
190 {
191 struct cb_recallargs *args = argp;
192 __be32 *p;
193 __be32 status;
194
195 status = decode_delegation_stateid(xdr, &args->stateid);
196 if (unlikely(status != 0))
197 return status;
198 p = xdr_inline_decode(xdr, 4);
199 if (unlikely(p == NULL))
200 return htonl(NFS4ERR_RESOURCE);
201 args->truncate = ntohl(*p);
202 return decode_fh(xdr, &args->fh);
203 }
204
205 #if defined(CONFIG_NFS_V4_1)
decode_layout_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)206 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
207 {
208 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
209 return decode_stateid(xdr, stateid);
210 }
211
decode_layoutrecall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)212 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
213 struct xdr_stream *xdr, void *argp)
214 {
215 struct cb_layoutrecallargs *args = argp;
216 __be32 *p;
217 __be32 status = 0;
218 uint32_t iomode;
219
220 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
221 if (unlikely(p == NULL))
222 return htonl(NFS4ERR_BADXDR);
223
224 args->cbl_layout_type = ntohl(*p++);
225 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
226 * as it is unusable and ignored with the other types.
227 */
228 iomode = ntohl(*p++);
229 args->cbl_layoutchanged = ntohl(*p++);
230 args->cbl_recall_type = ntohl(*p++);
231
232 if (args->cbl_recall_type == RETURN_FILE) {
233 args->cbl_range.iomode = iomode;
234 status = decode_fh(xdr, &args->cbl_fh);
235 if (unlikely(status != 0))
236 return status;
237
238 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
239 if (unlikely(p == NULL))
240 return htonl(NFS4ERR_BADXDR);
241 p = xdr_decode_hyper(p, &args->cbl_range.offset);
242 p = xdr_decode_hyper(p, &args->cbl_range.length);
243 return decode_layout_stateid(xdr, &args->cbl_stateid);
244 } else if (args->cbl_recall_type == RETURN_FSID) {
245 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
246 if (unlikely(p == NULL))
247 return htonl(NFS4ERR_BADXDR);
248 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
249 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
250 } else if (args->cbl_recall_type != RETURN_ALL)
251 return htonl(NFS4ERR_BADXDR);
252 return 0;
253 }
254
255 static
decode_devicenotify_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)256 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
257 struct xdr_stream *xdr,
258 void *argp)
259 {
260 struct cb_devicenotifyargs *args = argp;
261 __be32 *p;
262 __be32 status = 0;
263 u32 tmp;
264 int n, i;
265 args->ndevs = 0;
266
267 /* Num of device notifications */
268 p = xdr_inline_decode(xdr, sizeof(uint32_t));
269 if (unlikely(p == NULL)) {
270 status = htonl(NFS4ERR_BADXDR);
271 goto out;
272 }
273 n = ntohl(*p++);
274 if (n <= 0)
275 goto out;
276 if (n > ULONG_MAX / sizeof(*args->devs)) {
277 status = htonl(NFS4ERR_BADXDR);
278 goto out;
279 }
280
281 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
282 if (!args->devs) {
283 status = htonl(NFS4ERR_DELAY);
284 goto out;
285 }
286
287 /* Decode each dev notification */
288 for (i = 0; i < n; i++) {
289 struct cb_devicenotifyitem *dev = &args->devs[i];
290
291 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
292 NFS4_DEVICEID4_SIZE);
293 if (unlikely(p == NULL)) {
294 status = htonl(NFS4ERR_BADXDR);
295 goto err;
296 }
297
298 tmp = ntohl(*p++); /* bitmap size */
299 if (tmp != 1) {
300 status = htonl(NFS4ERR_INVAL);
301 goto err;
302 }
303 dev->cbd_notify_type = ntohl(*p++);
304 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
305 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
306 status = htonl(NFS4ERR_INVAL);
307 goto err;
308 }
309
310 tmp = ntohl(*p++); /* opaque size */
311 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
312 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
313 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
314 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
315 status = htonl(NFS4ERR_INVAL);
316 goto err;
317 }
318 dev->cbd_layout_type = ntohl(*p++);
319 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
320 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
321
322 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
323 p = xdr_inline_decode(xdr, sizeof(uint32_t));
324 if (unlikely(p == NULL)) {
325 status = htonl(NFS4ERR_BADXDR);
326 goto err;
327 }
328 dev->cbd_immediate = ntohl(*p++);
329 } else {
330 dev->cbd_immediate = 0;
331 }
332
333 args->ndevs++;
334
335 dprintk("%s: type %d layout 0x%x immediate %d\n",
336 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
337 dev->cbd_immediate);
338 }
339 out:
340 dprintk("%s: status %d ndevs %d\n",
341 __func__, ntohl(status), args->ndevs);
342 return status;
343 err:
344 kfree(args->devs);
345 goto out;
346 }
347
decode_sessionid(struct xdr_stream * xdr,struct nfs4_sessionid * sid)348 static __be32 decode_sessionid(struct xdr_stream *xdr,
349 struct nfs4_sessionid *sid)
350 {
351 __be32 *p;
352
353 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
354 if (unlikely(p == NULL))
355 return htonl(NFS4ERR_RESOURCE);
356
357 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
358 return 0;
359 }
360
decode_rc_list(struct xdr_stream * xdr,struct referring_call_list * rc_list)361 static __be32 decode_rc_list(struct xdr_stream *xdr,
362 struct referring_call_list *rc_list)
363 {
364 __be32 *p;
365 int i;
366 __be32 status;
367
368 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
369 if (status)
370 goto out;
371
372 status = htonl(NFS4ERR_RESOURCE);
373 p = xdr_inline_decode(xdr, sizeof(uint32_t));
374 if (unlikely(p == NULL))
375 goto out;
376
377 rc_list->rcl_nrefcalls = ntohl(*p++);
378 if (rc_list->rcl_nrefcalls) {
379 p = xdr_inline_decode(xdr,
380 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
381 if (unlikely(p == NULL))
382 goto out;
383 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
384 sizeof(*rc_list->rcl_refcalls),
385 GFP_KERNEL);
386 if (unlikely(rc_list->rcl_refcalls == NULL))
387 goto out;
388 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
389 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
390 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
391 }
392 }
393 status = 0;
394
395 out:
396 return status;
397 }
398
decode_cb_sequence_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)399 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
400 struct xdr_stream *xdr,
401 void *argp)
402 {
403 struct cb_sequenceargs *args = argp;
404 __be32 *p;
405 int i;
406 __be32 status;
407
408 status = decode_sessionid(xdr, &args->csa_sessionid);
409 if (status)
410 return status;
411
412 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
413 if (unlikely(p == NULL))
414 return htonl(NFS4ERR_RESOURCE);
415
416 args->csa_addr = svc_addr(rqstp);
417 args->csa_sequenceid = ntohl(*p++);
418 args->csa_slotid = ntohl(*p++);
419 args->csa_highestslotid = ntohl(*p++);
420 args->csa_cachethis = ntohl(*p++);
421 args->csa_nrclists = ntohl(*p++);
422 args->csa_rclists = NULL;
423 if (args->csa_nrclists) {
424 args->csa_rclists = kmalloc_array(args->csa_nrclists,
425 sizeof(*args->csa_rclists),
426 GFP_KERNEL);
427 if (unlikely(args->csa_rclists == NULL))
428 return htonl(NFS4ERR_RESOURCE);
429
430 for (i = 0; i < args->csa_nrclists; i++) {
431 status = decode_rc_list(xdr, &args->csa_rclists[i]);
432 if (status) {
433 args->csa_nrclists = i;
434 goto out_free;
435 }
436 }
437 }
438 return 0;
439
440 out_free:
441 for (i = 0; i < args->csa_nrclists; i++)
442 kfree(args->csa_rclists[i].rcl_refcalls);
443 kfree(args->csa_rclists);
444 return status;
445 }
446
decode_recallany_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)447 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
448 struct xdr_stream *xdr,
449 void *argp)
450 {
451 struct cb_recallanyargs *args = argp;
452 uint32_t bitmap[2];
453 __be32 *p, status;
454
455 p = xdr_inline_decode(xdr, 4);
456 if (unlikely(p == NULL))
457 return htonl(NFS4ERR_BADXDR);
458 args->craa_objs_to_keep = ntohl(*p++);
459 status = decode_bitmap(xdr, bitmap);
460 if (unlikely(status))
461 return status;
462 args->craa_type_mask = bitmap[0];
463
464 return 0;
465 }
466
decode_recallslot_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)467 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
468 struct xdr_stream *xdr,
469 void *argp)
470 {
471 struct cb_recallslotargs *args = argp;
472 __be32 *p;
473
474 p = xdr_inline_decode(xdr, 4);
475 if (unlikely(p == NULL))
476 return htonl(NFS4ERR_BADXDR);
477 args->crsa_target_highest_slotid = ntohl(*p++);
478 return 0;
479 }
480
decode_lockowner(struct xdr_stream * xdr,struct cb_notify_lock_args * args)481 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
482 {
483 __be32 *p;
484 unsigned int len;
485
486 p = xdr_inline_decode(xdr, 12);
487 if (unlikely(p == NULL))
488 return htonl(NFS4ERR_BADXDR);
489
490 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
491 len = be32_to_cpu(*p);
492
493 p = xdr_inline_decode(xdr, len);
494 if (unlikely(p == NULL))
495 return htonl(NFS4ERR_BADXDR);
496
497 /* Only try to decode if the length is right */
498 if (len == 20) {
499 p += 2; /* skip "lock id:" */
500 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
501 xdr_decode_hyper(p, &args->cbnl_owner.id);
502 args->cbnl_valid = true;
503 } else {
504 args->cbnl_owner.s_dev = 0;
505 args->cbnl_owner.id = 0;
506 args->cbnl_valid = false;
507 }
508 return 0;
509 }
510
decode_notify_lock_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)511 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
512 struct xdr_stream *xdr, void *argp)
513 {
514 struct cb_notify_lock_args *args = argp;
515 __be32 status;
516
517 status = decode_fh(xdr, &args->cbnl_fh);
518 if (unlikely(status != 0))
519 return status;
520 return decode_lockowner(xdr, args);
521 }
522
523 #endif /* CONFIG_NFS_V4_1 */
524 #ifdef CONFIG_NFS_V4_2
decode_write_response(struct xdr_stream * xdr,struct cb_offloadargs * args)525 static __be32 decode_write_response(struct xdr_stream *xdr,
526 struct cb_offloadargs *args)
527 {
528 __be32 *p;
529
530 /* skip the always zero field */
531 p = xdr_inline_decode(xdr, 4);
532 if (unlikely(!p))
533 goto out;
534 p++;
535
536 /* decode count, stable_how, verifier */
537 p = xdr_inline_decode(xdr, 8 + 4);
538 if (unlikely(!p))
539 goto out;
540 p = xdr_decode_hyper(p, &args->wr_count);
541 args->wr_writeverf.committed = be32_to_cpup(p);
542 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
543 if (likely(p)) {
544 memcpy(&args->wr_writeverf.verifier.data[0], p,
545 NFS4_VERIFIER_SIZE);
546 return 0;
547 }
548 out:
549 return htonl(NFS4ERR_RESOURCE);
550 }
551
decode_offload_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * data)552 static __be32 decode_offload_args(struct svc_rqst *rqstp,
553 struct xdr_stream *xdr,
554 void *data)
555 {
556 struct cb_offloadargs *args = data;
557 __be32 *p;
558 __be32 status;
559
560 /* decode fh */
561 status = decode_fh(xdr, &args->coa_fh);
562 if (unlikely(status != 0))
563 return status;
564
565 /* decode stateid */
566 status = decode_stateid(xdr, &args->coa_stateid);
567 if (unlikely(status != 0))
568 return status;
569
570 /* decode status */
571 p = xdr_inline_decode(xdr, 4);
572 if (unlikely(!p))
573 goto out;
574 args->error = ntohl(*p++);
575 if (!args->error) {
576 status = decode_write_response(xdr, args);
577 if (unlikely(status != 0))
578 return status;
579 } else {
580 p = xdr_inline_decode(xdr, 8);
581 if (unlikely(!p))
582 goto out;
583 p = xdr_decode_hyper(p, &args->wr_count);
584 }
585 return 0;
586 out:
587 return htonl(NFS4ERR_RESOURCE);
588 }
589 #endif /* CONFIG_NFS_V4_2 */
encode_string(struct xdr_stream * xdr,unsigned int len,const char * str)590 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
591 {
592 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
593 return cpu_to_be32(NFS4ERR_RESOURCE);
594 return 0;
595 }
596
encode_attr_bitmap(struct xdr_stream * xdr,const uint32_t * bitmap,size_t sz)597 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
598 {
599 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
600 return cpu_to_be32(NFS4ERR_RESOURCE);
601 return 0;
602 }
603
encode_attr_change(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t change)604 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
605 {
606 __be32 *p;
607
608 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
609 return 0;
610 p = xdr_reserve_space(xdr, 8);
611 if (unlikely(!p))
612 return htonl(NFS4ERR_RESOURCE);
613 p = xdr_encode_hyper(p, change);
614 return 0;
615 }
616
encode_attr_size(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t size)617 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
618 {
619 __be32 *p;
620
621 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
622 return 0;
623 p = xdr_reserve_space(xdr, 8);
624 if (unlikely(!p))
625 return htonl(NFS4ERR_RESOURCE);
626 p = xdr_encode_hyper(p, size);
627 return 0;
628 }
629
encode_attr_time(struct xdr_stream * xdr,const struct timespec * time)630 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec *time)
631 {
632 __be32 *p;
633
634 p = xdr_reserve_space(xdr, 12);
635 if (unlikely(!p))
636 return htonl(NFS4ERR_RESOURCE);
637 p = xdr_encode_hyper(p, time->tv_sec);
638 *p = htonl(time->tv_nsec);
639 return 0;
640 }
641
encode_attr_ctime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec * time)642 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
643 {
644 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
645 return 0;
646 return encode_attr_time(xdr,time);
647 }
648
encode_attr_mtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec * time)649 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec *time)
650 {
651 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
652 return 0;
653 return encode_attr_time(xdr,time);
654 }
655
encode_compound_hdr_res(struct xdr_stream * xdr,struct cb_compound_hdr_res * hdr)656 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
657 {
658 __be32 status;
659
660 hdr->status = xdr_reserve_space(xdr, 4);
661 if (unlikely(hdr->status == NULL))
662 return htonl(NFS4ERR_RESOURCE);
663 status = encode_string(xdr, hdr->taglen, hdr->tag);
664 if (unlikely(status != 0))
665 return status;
666 hdr->nops = xdr_reserve_space(xdr, 4);
667 if (unlikely(hdr->nops == NULL))
668 return htonl(NFS4ERR_RESOURCE);
669 return 0;
670 }
671
encode_op_hdr(struct xdr_stream * xdr,uint32_t op,__be32 res)672 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
673 {
674 __be32 *p;
675
676 p = xdr_reserve_space(xdr, 8);
677 if (unlikely(p == NULL))
678 return htonl(NFS4ERR_RESOURCE_HDR);
679 *p++ = htonl(op);
680 *p = res;
681 return 0;
682 }
683
encode_getattr_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)684 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
685 const void *resp)
686 {
687 const struct cb_getattrres *res = resp;
688 __be32 *savep = NULL;
689 __be32 status = res->status;
690
691 if (unlikely(status != 0))
692 goto out;
693 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
694 if (unlikely(status != 0))
695 goto out;
696 status = cpu_to_be32(NFS4ERR_RESOURCE);
697 savep = xdr_reserve_space(xdr, sizeof(*savep));
698 if (unlikely(!savep))
699 goto out;
700 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
701 if (unlikely(status != 0))
702 goto out;
703 status = encode_attr_size(xdr, res->bitmap, res->size);
704 if (unlikely(status != 0))
705 goto out;
706 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
707 if (unlikely(status != 0))
708 goto out;
709 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
710 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
711 out:
712 return status;
713 }
714
715 #if defined(CONFIG_NFS_V4_1)
716
encode_sessionid(struct xdr_stream * xdr,const struct nfs4_sessionid * sid)717 static __be32 encode_sessionid(struct xdr_stream *xdr,
718 const struct nfs4_sessionid *sid)
719 {
720 __be32 *p;
721
722 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
723 if (unlikely(p == NULL))
724 return htonl(NFS4ERR_RESOURCE);
725
726 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
727 return 0;
728 }
729
encode_cb_sequence_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)730 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
731 struct xdr_stream *xdr,
732 const void *resp)
733 {
734 const struct cb_sequenceres *res = resp;
735 __be32 *p;
736 __be32 status = res->csr_status;
737
738 if (unlikely(status != 0))
739 return status;
740
741 status = encode_sessionid(xdr, &res->csr_sessionid);
742 if (status)
743 return status;
744
745 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
746 if (unlikely(p == NULL))
747 return htonl(NFS4ERR_RESOURCE);
748
749 *p++ = htonl(res->csr_sequenceid);
750 *p++ = htonl(res->csr_slotid);
751 *p++ = htonl(res->csr_highestslotid);
752 *p++ = htonl(res->csr_target_highestslotid);
753 return 0;
754 }
755
756 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)757 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
758 {
759 if (op_nr == OP_CB_SEQUENCE) {
760 if (nop != 0)
761 return htonl(NFS4ERR_SEQUENCE_POS);
762 } else {
763 if (nop == 0)
764 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
765 }
766
767 switch (op_nr) {
768 case OP_CB_GETATTR:
769 case OP_CB_RECALL:
770 case OP_CB_SEQUENCE:
771 case OP_CB_RECALL_ANY:
772 case OP_CB_RECALL_SLOT:
773 case OP_CB_LAYOUTRECALL:
774 case OP_CB_NOTIFY_DEVICEID:
775 case OP_CB_NOTIFY_LOCK:
776 *op = &callback_ops[op_nr];
777 break;
778
779 case OP_CB_NOTIFY:
780 case OP_CB_PUSH_DELEG:
781 case OP_CB_RECALLABLE_OBJ_AVAIL:
782 case OP_CB_WANTS_CANCELLED:
783 return htonl(NFS4ERR_NOTSUPP);
784
785 default:
786 return htonl(NFS4ERR_OP_ILLEGAL);
787 }
788
789 return htonl(NFS_OK);
790 }
791
nfs4_callback_free_slot(struct nfs4_session * session,struct nfs4_slot * slot)792 static void nfs4_callback_free_slot(struct nfs4_session *session,
793 struct nfs4_slot *slot)
794 {
795 struct nfs4_slot_table *tbl = &session->bc_slot_table;
796
797 spin_lock(&tbl->slot_tbl_lock);
798 /*
799 * Let the state manager know callback processing done.
800 * A single slot, so highest used slotid is either 0 or -1
801 */
802 nfs4_free_slot(tbl, slot);
803 spin_unlock(&tbl->slot_tbl_lock);
804 }
805
nfs4_cb_free_slot(struct cb_process_state * cps)806 static void nfs4_cb_free_slot(struct cb_process_state *cps)
807 {
808 if (cps->slot) {
809 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
810 cps->slot = NULL;
811 }
812 }
813
814 #else /* CONFIG_NFS_V4_1 */
815
816 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)817 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
818 {
819 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
820 }
821
nfs4_cb_free_slot(struct cb_process_state * cps)822 static void nfs4_cb_free_slot(struct cb_process_state *cps)
823 {
824 }
825 #endif /* CONFIG_NFS_V4_1 */
826
827 #ifdef CONFIG_NFS_V4_2
828 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)829 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
830 {
831 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
832 if (status != htonl(NFS4ERR_OP_ILLEGAL))
833 return status;
834
835 if (op_nr == OP_CB_OFFLOAD) {
836 *op = &callback_ops[op_nr];
837 return htonl(NFS_OK);
838 } else
839 return htonl(NFS4ERR_NOTSUPP);
840 return htonl(NFS4ERR_OP_ILLEGAL);
841 }
842 #else /* CONFIG_NFS_V4_2 */
843 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)844 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
845 {
846 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
847 }
848 #endif /* CONFIG_NFS_V4_2 */
849
850 static __be32
preprocess_nfs4_op(unsigned int op_nr,struct callback_op ** op)851 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
852 {
853 switch (op_nr) {
854 case OP_CB_GETATTR:
855 case OP_CB_RECALL:
856 *op = &callback_ops[op_nr];
857 break;
858 default:
859 return htonl(NFS4ERR_OP_ILLEGAL);
860 }
861
862 return htonl(NFS_OK);
863 }
864
process_op(int nop,struct svc_rqst * rqstp,struct xdr_stream * xdr_in,void * argp,struct xdr_stream * xdr_out,void * resp,struct cb_process_state * cps)865 static __be32 process_op(int nop, struct svc_rqst *rqstp,
866 struct xdr_stream *xdr_in, void *argp,
867 struct xdr_stream *xdr_out, void *resp,
868 struct cb_process_state *cps)
869 {
870 struct callback_op *op = &callback_ops[0];
871 unsigned int op_nr;
872 __be32 status;
873 long maxlen;
874 __be32 res;
875
876 status = decode_op_hdr(xdr_in, &op_nr);
877 if (unlikely(status))
878 return status;
879
880 switch (cps->minorversion) {
881 case 0:
882 status = preprocess_nfs4_op(op_nr, &op);
883 break;
884 case 1:
885 status = preprocess_nfs41_op(nop, op_nr, &op);
886 break;
887 case 2:
888 status = preprocess_nfs42_op(nop, op_nr, &op);
889 break;
890 default:
891 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
892 }
893
894 if (status == htonl(NFS4ERR_OP_ILLEGAL))
895 op_nr = OP_CB_ILLEGAL;
896 if (status)
897 goto encode_hdr;
898
899 if (cps->drc_status) {
900 status = cps->drc_status;
901 goto encode_hdr;
902 }
903
904 maxlen = xdr_out->end - xdr_out->p;
905 if (maxlen > 0 && maxlen < PAGE_SIZE) {
906 status = op->decode_args(rqstp, xdr_in, argp);
907 if (likely(status == 0))
908 status = op->process_op(argp, resp, cps);
909 } else
910 status = htonl(NFS4ERR_RESOURCE);
911
912 encode_hdr:
913 res = encode_op_hdr(xdr_out, op_nr, status);
914 if (unlikely(res))
915 return res;
916 if (op->encode_res != NULL && status == 0)
917 status = op->encode_res(rqstp, xdr_out, resp);
918 return status;
919 }
920
921 /*
922 * Decode, process and encode a COMPOUND
923 */
nfs4_callback_compound(struct svc_rqst * rqstp)924 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
925 {
926 struct cb_compound_hdr_arg hdr_arg = { 0 };
927 struct cb_compound_hdr_res hdr_res = { NULL };
928 struct xdr_stream xdr_in, xdr_out;
929 __be32 *p, status;
930 struct cb_process_state cps = {
931 .drc_status = 0,
932 .clp = NULL,
933 .net = SVC_NET(rqstp),
934 };
935 unsigned int nops = 0;
936
937 xdr_init_decode(&xdr_in, &rqstp->rq_arg,
938 rqstp->rq_arg.head[0].iov_base, NULL);
939
940 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
941 xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL);
942
943 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
944 if (status == htonl(NFS4ERR_RESOURCE))
945 return rpc_garbage_args;
946
947 if (hdr_arg.minorversion == 0) {
948 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
949 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) {
950 if (cps.clp)
951 nfs_put_client(cps.clp);
952 goto out_invalidcred;
953 }
954 }
955
956 cps.minorversion = hdr_arg.minorversion;
957 hdr_res.taglen = hdr_arg.taglen;
958 hdr_res.tag = hdr_arg.tag;
959 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
960 if (cps.clp)
961 nfs_put_client(cps.clp);
962 return rpc_system_err;
963 }
964 while (status == 0 && nops != hdr_arg.nops) {
965 status = process_op(nops, rqstp, &xdr_in,
966 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
967 &cps);
968 nops++;
969 }
970
971 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
972 * resource error in cb_compound status without returning op */
973 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
974 status = htonl(NFS4ERR_RESOURCE);
975 nops--;
976 }
977
978 *hdr_res.status = status;
979 *hdr_res.nops = htonl(nops);
980 nfs4_cb_free_slot(&cps);
981 nfs_put_client(cps.clp);
982 return rpc_success;
983
984 out_invalidcred:
985 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
986 return svc_return_autherr(rqstp, rpc_autherr_badcred);
987 }
988
989 /*
990 * Define NFS4 callback COMPOUND ops.
991 */
992 static struct callback_op callback_ops[] = {
993 [0] = {
994 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
995 },
996 [OP_CB_GETATTR] = {
997 .process_op = nfs4_callback_getattr,
998 .decode_args = decode_getattr_args,
999 .encode_res = encode_getattr_res,
1000 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1001 },
1002 [OP_CB_RECALL] = {
1003 .process_op = nfs4_callback_recall,
1004 .decode_args = decode_recall_args,
1005 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1006 },
1007 #if defined(CONFIG_NFS_V4_1)
1008 [OP_CB_LAYOUTRECALL] = {
1009 .process_op = nfs4_callback_layoutrecall,
1010 .decode_args = decode_layoutrecall_args,
1011 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1012 },
1013 [OP_CB_NOTIFY_DEVICEID] = {
1014 .process_op = nfs4_callback_devicenotify,
1015 .decode_args = decode_devicenotify_args,
1016 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1017 },
1018 [OP_CB_SEQUENCE] = {
1019 .process_op = nfs4_callback_sequence,
1020 .decode_args = decode_cb_sequence_args,
1021 .encode_res = encode_cb_sequence_res,
1022 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1023 },
1024 [OP_CB_RECALL_ANY] = {
1025 .process_op = nfs4_callback_recallany,
1026 .decode_args = decode_recallany_args,
1027 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1028 },
1029 [OP_CB_RECALL_SLOT] = {
1030 .process_op = nfs4_callback_recallslot,
1031 .decode_args = decode_recallslot_args,
1032 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1033 },
1034 [OP_CB_NOTIFY_LOCK] = {
1035 .process_op = nfs4_callback_notify_lock,
1036 .decode_args = decode_notify_lock_args,
1037 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1038 },
1039 #endif /* CONFIG_NFS_V4_1 */
1040 #ifdef CONFIG_NFS_V4_2
1041 [OP_CB_OFFLOAD] = {
1042 .process_op = nfs4_callback_offload,
1043 .decode_args = decode_offload_args,
1044 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1045 },
1046 #endif /* CONFIG_NFS_V4_2 */
1047 };
1048
1049 /*
1050 * Define NFS4 callback procedures
1051 */
1052 static const struct svc_procedure nfs4_callback_procedures1[] = {
1053 [CB_NULL] = {
1054 .pc_func = nfs4_callback_null,
1055 .pc_decode = nfs4_decode_void,
1056 .pc_encode = nfs4_encode_void,
1057 .pc_xdrressize = 1,
1058 },
1059 [CB_COMPOUND] = {
1060 .pc_func = nfs4_callback_compound,
1061 .pc_encode = nfs4_encode_void,
1062 .pc_argsize = 256,
1063 .pc_ressize = 256,
1064 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1065 }
1066 };
1067
1068 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1069 const struct svc_version nfs4_callback_version1 = {
1070 .vs_vers = 1,
1071 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1072 .vs_proc = nfs4_callback_procedures1,
1073 .vs_count = nfs4_callback_count1,
1074 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1075 .vs_dispatch = NULL,
1076 .vs_hidden = true,
1077 .vs_need_cong_ctrl = true,
1078 };
1079
1080 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1081 const struct svc_version nfs4_callback_version4 = {
1082 .vs_vers = 4,
1083 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1084 .vs_proc = nfs4_callback_procedures1,
1085 .vs_count = nfs4_callback_count4,
1086 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1087 .vs_dispatch = NULL,
1088 .vs_hidden = true,
1089 .vs_need_cong_ctrl = true,
1090 };
1091
