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 #include "nfs4trace.h"
22
23 #define CB_OP_TAGLEN_MAXSZ (512)
24 #define CB_OP_HDR_RES_MAXSZ (2 * 4) // opcode, status
25 #define CB_OP_GETATTR_BITMAP_MAXSZ (4 * 4) // bitmap length, 3 bitmaps
26 #define CB_OP_GETATTR_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
27 CB_OP_GETATTR_BITMAP_MAXSZ + \
28 /* change, size, atime, ctime,
29 * mtime, deleg_atime, deleg_mtime */\
30 (2 + 2 + 3 + 3 + 3 + 3 + 3) * 4)
31 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
32
33 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
34 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
36 NFS4_MAX_SESSIONID_LEN + \
37 (1 + 3) * 4) // seqid, 3 slotids
38 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
39 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
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
65 /*
66 * svc_process_common() looks for an XDR encoder to know when
67 * not to drop a Reply.
68 */
nfs4_encode_void(struct svc_rqst * rqstp,struct xdr_stream * xdr)69 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
70 {
71 return true;
72 }
73
decode_string(struct xdr_stream * xdr,unsigned int * len,const char ** str,size_t maxlen)74 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
75 const char **str, size_t maxlen)
76 {
77 ssize_t err;
78
79 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
80 if (err < 0)
81 return cpu_to_be32(NFS4ERR_RESOURCE);
82 *len = err;
83 return 0;
84 }
85
decode_fh(struct xdr_stream * xdr,struct nfs_fh * fh)86 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
87 {
88 __be32 *p;
89
90 p = xdr_inline_decode(xdr, 4);
91 if (unlikely(p == NULL))
92 return htonl(NFS4ERR_RESOURCE);
93 fh->size = ntohl(*p);
94 if (fh->size > NFS4_FHSIZE)
95 return htonl(NFS4ERR_BADHANDLE);
96 p = xdr_inline_decode(xdr, fh->size);
97 if (unlikely(p == NULL))
98 return htonl(NFS4ERR_RESOURCE);
99 memcpy(&fh->data[0], p, fh->size);
100 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
101 return 0;
102 }
103
decode_bitmap(struct xdr_stream * xdr,uint32_t * bitmap)104 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
105 {
106 __be32 *p;
107 unsigned int attrlen;
108
109 p = xdr_inline_decode(xdr, 4);
110 if (unlikely(p == NULL))
111 return htonl(NFS4ERR_RESOURCE);
112 attrlen = ntohl(*p);
113 p = xdr_inline_decode(xdr, attrlen << 2);
114 if (unlikely(p == NULL))
115 return htonl(NFS4ERR_RESOURCE);
116 if (likely(attrlen > 0))
117 bitmap[0] = ntohl(*p++);
118 if (attrlen > 1)
119 bitmap[1] = ntohl(*p++);
120 if (attrlen > 2)
121 bitmap[2] = ntohl(*p);
122 return 0;
123 }
124
decode_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)125 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
126 {
127 __be32 *p;
128
129 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
130 if (unlikely(p == NULL))
131 return htonl(NFS4ERR_RESOURCE);
132 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
133 return 0;
134 }
135
decode_delegation_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)136 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
137 {
138 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
139 return decode_stateid(xdr, stateid);
140 }
141
decode_compound_hdr_arg(struct xdr_stream * xdr,struct cb_compound_hdr_arg * hdr)142 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
143 {
144 __be32 *p;
145 __be32 status;
146
147 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
148 if (unlikely(status != 0))
149 return status;
150 p = xdr_inline_decode(xdr, 12);
151 if (unlikely(p == NULL))
152 return htonl(NFS4ERR_RESOURCE);
153 hdr->minorversion = ntohl(*p++);
154 /* Check for minor version support */
155 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
156 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
157 } else {
158 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
159 "illegal minor version %u!\n",
160 __func__, hdr->minorversion);
161 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
162 }
163 hdr->nops = ntohl(*p);
164 return 0;
165 }
166
decode_op_hdr(struct xdr_stream * xdr,unsigned int * op)167 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
168 {
169 __be32 *p;
170 p = xdr_inline_decode(xdr, 4);
171 if (unlikely(p == NULL))
172 return htonl(NFS4ERR_RESOURCE_HDR);
173 *op = ntohl(*p);
174 return 0;
175 }
176
decode_getattr_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)177 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
178 struct xdr_stream *xdr, void *argp)
179 {
180 struct cb_getattrargs *args = argp;
181 __be32 status;
182
183 status = decode_fh(xdr, &args->fh);
184 if (unlikely(status != 0))
185 return status;
186 return decode_bitmap(xdr, args->bitmap);
187 }
188
decode_recall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)189 static __be32 decode_recall_args(struct svc_rqst *rqstp,
190 struct xdr_stream *xdr, void *argp)
191 {
192 struct cb_recallargs *args = argp;
193 __be32 *p;
194 __be32 status;
195
196 status = decode_delegation_stateid(xdr, &args->stateid);
197 if (unlikely(status != 0))
198 return status;
199 p = xdr_inline_decode(xdr, 4);
200 if (unlikely(p == NULL))
201 return htonl(NFS4ERR_RESOURCE);
202 args->truncate = ntohl(*p);
203 return decode_fh(xdr, &args->fh);
204 }
205
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 uint32_t tmp, n, i;
262 __be32 *p;
263 __be32 status = 0;
264
265 /* Num of device notifications */
266 p = xdr_inline_decode(xdr, sizeof(uint32_t));
267 if (unlikely(p == NULL)) {
268 status = htonl(NFS4ERR_BADXDR);
269 goto out;
270 }
271 n = ntohl(*p++);
272 if (n == 0)
273 goto out;
274
275 args->devs = kmalloc_objs(*args->devs, n);
276 if (!args->devs) {
277 status = htonl(NFS4ERR_DELAY);
278 goto out;
279 }
280
281 /* Decode each dev notification */
282 for (i = 0; i < n; i++) {
283 struct cb_devicenotifyitem *dev = &args->devs[i];
284
285 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
286 NFS4_DEVICEID4_SIZE);
287 if (unlikely(p == NULL)) {
288 status = htonl(NFS4ERR_BADXDR);
289 goto err;
290 }
291
292 tmp = ntohl(*p++); /* bitmap size */
293 if (tmp != 1) {
294 status = htonl(NFS4ERR_INVAL);
295 goto err;
296 }
297 dev->cbd_notify_type = ntohl(*p++);
298 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
299 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
300 status = htonl(NFS4ERR_INVAL);
301 goto err;
302 }
303
304 tmp = ntohl(*p++); /* opaque size */
305 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
306 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
307 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
308 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
309 status = htonl(NFS4ERR_INVAL);
310 goto err;
311 }
312 dev->cbd_layout_type = ntohl(*p++);
313 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
314 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
315
316 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
317 p = xdr_inline_decode(xdr, sizeof(uint32_t));
318 if (unlikely(p == NULL)) {
319 status = htonl(NFS4ERR_BADXDR);
320 goto err;
321 }
322 dev->cbd_immediate = ntohl(*p++);
323 } else {
324 dev->cbd_immediate = 0;
325 }
326
327 dprintk("%s: type %d layout 0x%x immediate %d\n",
328 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
329 dev->cbd_immediate);
330 }
331 args->ndevs = n;
332 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
333 return 0;
334 err:
335 kfree(args->devs);
336 out:
337 args->devs = NULL;
338 args->ndevs = 0;
339 dprintk("%s: status %d ndevs %d\n",
340 __func__, ntohl(status), args->ndevs);
341 return status;
342 }
343
decode_sessionid(struct xdr_stream * xdr,struct nfs4_sessionid * sid)344 static __be32 decode_sessionid(struct xdr_stream *xdr,
345 struct nfs4_sessionid *sid)
346 {
347 __be32 *p;
348
349 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
350 if (unlikely(p == NULL))
351 return htonl(NFS4ERR_RESOURCE);
352
353 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
354 return 0;
355 }
356
decode_rc_list(struct xdr_stream * xdr,struct referring_call_list * rc_list)357 static __be32 decode_rc_list(struct xdr_stream *xdr,
358 struct referring_call_list *rc_list)
359 {
360 __be32 *p;
361 int i;
362 __be32 status;
363
364 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
365 if (status)
366 goto out;
367
368 status = htonl(NFS4ERR_RESOURCE);
369 p = xdr_inline_decode(xdr, sizeof(uint32_t));
370 if (unlikely(p == NULL))
371 goto out;
372
373 rc_list->rcl_nrefcalls = ntohl(*p++);
374 if (rc_list->rcl_nrefcalls) {
375 if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len))
376 goto out;
377 p = xdr_inline_decode(xdr,
378 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
379 if (unlikely(p == NULL))
380 goto out;
381 rc_list->rcl_refcalls = kmalloc_objs(*rc_list->rcl_refcalls,
382 rc_list->rcl_nrefcalls);
383 if (unlikely(rc_list->rcl_refcalls == NULL))
384 goto out;
385 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
386 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
387 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
388 }
389 }
390 status = 0;
391
392 out:
393 return status;
394 }
395
decode_cb_sequence_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)396 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
397 struct xdr_stream *xdr,
398 void *argp)
399 {
400 struct cb_sequenceargs *args = argp;
401 __be32 *p;
402 int i;
403 __be32 status;
404
405 status = decode_sessionid(xdr, &args->csa_sessionid);
406 if (status)
407 return status;
408
409 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
410 if (unlikely(p == NULL))
411 return htonl(NFS4ERR_RESOURCE);
412
413 args->csa_addr = svc_addr(rqstp);
414 args->csa_sequenceid = ntohl(*p++);
415 args->csa_slotid = ntohl(*p++);
416 args->csa_highestslotid = ntohl(*p++);
417 args->csa_cachethis = ntohl(*p++);
418 args->csa_nrclists = ntohl(*p++);
419 args->csa_rclists = NULL;
420 if (args->csa_nrclists) {
421 args->csa_rclists = kmalloc_objs(*args->csa_rclists,
422 args->csa_nrclists);
423 if (unlikely(args->csa_rclists == NULL))
424 return htonl(NFS4ERR_RESOURCE);
425
426 for (i = 0; i < args->csa_nrclists; i++) {
427 status = decode_rc_list(xdr, &args->csa_rclists[i]);
428 if (status) {
429 args->csa_nrclists = i;
430 goto out_free;
431 }
432 }
433 }
434 return 0;
435
436 out_free:
437 for (i = 0; i < args->csa_nrclists; i++)
438 kfree(args->csa_rclists[i].rcl_refcalls);
439 kfree(args->csa_rclists);
440 return status;
441 }
442
decode_recallany_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)443 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
444 struct xdr_stream *xdr,
445 void *argp)
446 {
447 struct cb_recallanyargs *args = argp;
448 uint32_t bitmap[3];
449 __be32 *p, status;
450
451 p = xdr_inline_decode(xdr, 4);
452 if (unlikely(p == NULL))
453 return htonl(NFS4ERR_BADXDR);
454 args->craa_objs_to_keep = ntohl(*p++);
455 status = decode_bitmap(xdr, bitmap);
456 if (unlikely(status))
457 return status;
458 args->craa_type_mask = bitmap[0];
459
460 return 0;
461 }
462
decode_recallslot_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)463 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
464 struct xdr_stream *xdr,
465 void *argp)
466 {
467 struct cb_recallslotargs *args = argp;
468 __be32 *p;
469
470 p = xdr_inline_decode(xdr, 4);
471 if (unlikely(p == NULL))
472 return htonl(NFS4ERR_BADXDR);
473 args->crsa_target_highest_slotid = ntohl(*p++);
474 return 0;
475 }
476
decode_lockowner(struct xdr_stream * xdr,struct cb_notify_lock_args * args)477 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
478 {
479 __be32 *p;
480 unsigned int len;
481
482 p = xdr_inline_decode(xdr, 12);
483 if (unlikely(p == NULL))
484 return htonl(NFS4ERR_BADXDR);
485
486 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
487 len = be32_to_cpu(*p);
488
489 p = xdr_inline_decode(xdr, len);
490 if (unlikely(p == NULL))
491 return htonl(NFS4ERR_BADXDR);
492
493 /* Only try to decode if the length is right */
494 if (len == 20) {
495 p += 2; /* skip "lock id:" */
496 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
497 xdr_decode_hyper(p, &args->cbnl_owner.id);
498 args->cbnl_valid = true;
499 } else {
500 args->cbnl_owner.s_dev = 0;
501 args->cbnl_owner.id = 0;
502 args->cbnl_valid = false;
503 }
504 return 0;
505 }
506
decode_notify_lock_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)507 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
508 struct xdr_stream *xdr, void *argp)
509 {
510 struct cb_notify_lock_args *args = argp;
511 __be32 status;
512
513 status = decode_fh(xdr, &args->cbnl_fh);
514 if (unlikely(status != 0))
515 return status;
516 return decode_lockowner(xdr, args);
517 }
518
519 #ifdef CONFIG_NFS_V4_2
decode_write_response(struct xdr_stream * xdr,struct cb_offloadargs * args)520 static __be32 decode_write_response(struct xdr_stream *xdr,
521 struct cb_offloadargs *args)
522 {
523 __be32 *p;
524
525 /* skip the always zero field */
526 p = xdr_inline_decode(xdr, 4);
527 if (unlikely(!p))
528 goto out;
529 p++;
530
531 /* decode count, stable_how, verifier */
532 p = xdr_inline_decode(xdr, 8 + 4);
533 if (unlikely(!p))
534 goto out;
535 p = xdr_decode_hyper(p, &args->wr_count);
536 args->wr_writeverf.committed = be32_to_cpup(p);
537 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
538 if (likely(p)) {
539 memcpy(&args->wr_writeverf.verifier.data[0], p,
540 NFS4_VERIFIER_SIZE);
541 return 0;
542 }
543 out:
544 return htonl(NFS4ERR_RESOURCE);
545 }
546
decode_offload_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * data)547 static __be32 decode_offload_args(struct svc_rqst *rqstp,
548 struct xdr_stream *xdr,
549 void *data)
550 {
551 struct cb_offloadargs *args = data;
552 __be32 *p;
553 __be32 status;
554
555 /* decode fh */
556 status = decode_fh(xdr, &args->coa_fh);
557 if (unlikely(status != 0))
558 return status;
559
560 /* decode stateid */
561 status = decode_stateid(xdr, &args->coa_stateid);
562 if (unlikely(status != 0))
563 return status;
564
565 /* decode status */
566 p = xdr_inline_decode(xdr, 4);
567 if (unlikely(!p))
568 goto out;
569 args->error = ntohl(*p++);
570 if (!args->error) {
571 status = decode_write_response(xdr, args);
572 if (unlikely(status != 0))
573 return status;
574 } else {
575 p = xdr_inline_decode(xdr, 8);
576 if (unlikely(!p))
577 goto out;
578 p = xdr_decode_hyper(p, &args->wr_count);
579 }
580 return 0;
581 out:
582 return htonl(NFS4ERR_RESOURCE);
583 }
584 #endif /* CONFIG_NFS_V4_2 */
encode_string(struct xdr_stream * xdr,unsigned int len,const char * str)585 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
586 {
587 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
588 return cpu_to_be32(NFS4ERR_RESOURCE);
589 return 0;
590 }
591
encode_attr_bitmap(struct xdr_stream * xdr,const uint32_t * bitmap,size_t sz)592 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
593 {
594 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
595 return cpu_to_be32(NFS4ERR_RESOURCE);
596 return 0;
597 }
598
encode_attr_change(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t change)599 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
600 {
601 __be32 *p;
602
603 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
604 return 0;
605 p = xdr_reserve_space(xdr, 8);
606 if (unlikely(!p))
607 return htonl(NFS4ERR_RESOURCE);
608 p = xdr_encode_hyper(p, change);
609 return 0;
610 }
611
encode_attr_size(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t size)612 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
613 {
614 __be32 *p;
615
616 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
617 return 0;
618 p = xdr_reserve_space(xdr, 8);
619 if (unlikely(!p))
620 return htonl(NFS4ERR_RESOURCE);
621 p = xdr_encode_hyper(p, size);
622 return 0;
623 }
624
encode_attr_time(struct xdr_stream * xdr,const struct timespec64 * time)625 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
626 {
627 __be32 *p;
628
629 p = xdr_reserve_space(xdr, 12);
630 if (unlikely(!p))
631 return htonl(NFS4ERR_RESOURCE);
632 p = xdr_encode_hyper(p, time->tv_sec);
633 *p = htonl(time->tv_nsec);
634 return 0;
635 }
636
encode_attr_atime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)637 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
638 {
639 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS))
640 return 0;
641 return encode_attr_time(xdr,time);
642 }
643
encode_attr_ctime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)644 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
645 {
646 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
647 return 0;
648 return encode_attr_time(xdr,time);
649 }
650
encode_attr_mtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)651 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
652 {
653 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
654 return 0;
655 return encode_attr_time(xdr,time);
656 }
657
encode_attr_delegatime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)658 static __be32 encode_attr_delegatime(struct xdr_stream *xdr,
659 const uint32_t *bitmap,
660 const struct timespec64 *time)
661 {
662 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS))
663 return 0;
664 return encode_attr_time(xdr,time);
665 }
666
encode_attr_delegmtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)667 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr,
668 const uint32_t *bitmap,
669 const struct timespec64 *time)
670 {
671 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY))
672 return 0;
673 return encode_attr_time(xdr,time);
674 }
675
encode_compound_hdr_res(struct xdr_stream * xdr,struct cb_compound_hdr_res * hdr)676 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
677 {
678 __be32 status;
679
680 hdr->status = xdr_reserve_space(xdr, 4);
681 if (unlikely(hdr->status == NULL))
682 return htonl(NFS4ERR_RESOURCE);
683 status = encode_string(xdr, hdr->taglen, hdr->tag);
684 if (unlikely(status != 0))
685 return status;
686 hdr->nops = xdr_reserve_space(xdr, 4);
687 if (unlikely(hdr->nops == NULL))
688 return htonl(NFS4ERR_RESOURCE);
689 return 0;
690 }
691
encode_op_hdr(struct xdr_stream * xdr,uint32_t op,__be32 res)692 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
693 {
694 __be32 *p;
695
696 p = xdr_reserve_space(xdr, 8);
697 if (unlikely(p == NULL))
698 return htonl(NFS4ERR_RESOURCE_HDR);
699 *p++ = htonl(op);
700 *p = res;
701 return 0;
702 }
703
encode_getattr_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)704 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
705 const void *resp)
706 {
707 const struct cb_getattrres *res = resp;
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, ARRAY_SIZE(res->bitmap));
714 if (unlikely(status != 0))
715 goto out;
716 status = cpu_to_be32(NFS4ERR_RESOURCE);
717 savep = xdr_reserve_space(xdr, sizeof(*savep));
718 if (unlikely(!savep))
719 goto out;
720 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
721 if (unlikely(status != 0))
722 goto out;
723 status = encode_attr_size(xdr, res->bitmap, res->size);
724 if (unlikely(status != 0))
725 goto out;
726 status = encode_attr_atime(xdr, res->bitmap, &res->atime);
727 if (unlikely(status != 0))
728 goto out;
729 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
730 if (unlikely(status != 0))
731 goto out;
732 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
733 if (unlikely(status != 0))
734 goto out;
735 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime);
736 if (unlikely(status != 0))
737 goto out;
738 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime);
739 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
740 out:
741 return status;
742 }
743
encode_sessionid(struct xdr_stream * xdr,const struct nfs4_sessionid * sid)744 static __be32 encode_sessionid(struct xdr_stream *xdr,
745 const struct nfs4_sessionid *sid)
746 {
747 __be32 *p;
748
749 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
750 if (unlikely(p == NULL))
751 return htonl(NFS4ERR_RESOURCE);
752
753 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
754 return 0;
755 }
756
encode_cb_sequence_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)757 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
758 struct xdr_stream *xdr,
759 const void *resp)
760 {
761 const struct cb_sequenceres *res = resp;
762 __be32 *p;
763 __be32 status = res->csr_status;
764
765 if (unlikely(status != 0))
766 return status;
767
768 status = encode_sessionid(xdr, &res->csr_sessionid);
769 if (status)
770 return status;
771
772 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
773 if (unlikely(p == NULL))
774 return htonl(NFS4ERR_RESOURCE);
775
776 *p++ = htonl(res->csr_sequenceid);
777 *p++ = htonl(res->csr_slotid);
778 *p++ = htonl(res->csr_highestslotid);
779 *p++ = htonl(res->csr_target_highestslotid);
780 return 0;
781 }
782
783 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)784 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
785 {
786 if (op_nr == OP_CB_SEQUENCE) {
787 if (nop != 0)
788 return htonl(NFS4ERR_SEQUENCE_POS);
789 } else {
790 if (nop == 0)
791 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
792 }
793
794 switch (op_nr) {
795 case OP_CB_GETATTR:
796 case OP_CB_RECALL:
797 case OP_CB_SEQUENCE:
798 case OP_CB_RECALL_ANY:
799 case OP_CB_RECALL_SLOT:
800 case OP_CB_LAYOUTRECALL:
801 case OP_CB_NOTIFY_DEVICEID:
802 case OP_CB_NOTIFY_LOCK:
803 *op = &callback_ops[op_nr];
804 break;
805
806 case OP_CB_NOTIFY:
807 case OP_CB_PUSH_DELEG:
808 case OP_CB_RECALLABLE_OBJ_AVAIL:
809 case OP_CB_WANTS_CANCELLED:
810 return htonl(NFS4ERR_NOTSUPP);
811
812 default:
813 return htonl(NFS4ERR_OP_ILLEGAL);
814 }
815
816 return htonl(NFS_OK);
817 }
818
nfs4_callback_free_slot(struct nfs4_session * session,struct nfs4_slot * slot)819 static void nfs4_callback_free_slot(struct nfs4_session *session,
820 struct nfs4_slot *slot)
821 {
822 struct nfs4_slot_table *tbl = &session->bc_slot_table;
823
824 spin_lock(&tbl->slot_tbl_lock);
825 /*
826 * Let the state manager know callback processing done.
827 * A single slot, so highest used slotid is either 0 or -1
828 */
829 nfs4_free_slot(tbl, slot);
830 spin_unlock(&tbl->slot_tbl_lock);
831 }
832
nfs4_cb_free_slot(struct cb_process_state * cps)833 static void nfs4_cb_free_slot(struct cb_process_state *cps)
834 {
835 if (cps->slot) {
836 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
837 cps->slot = NULL;
838 }
839 }
840
841 #ifdef CONFIG_NFS_V4_2
842 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)843 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
844 {
845 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
846 if (status != htonl(NFS4ERR_OP_ILLEGAL))
847 return status;
848
849 if (op_nr == OP_CB_OFFLOAD) {
850 *op = &callback_ops[op_nr];
851 return htonl(NFS_OK);
852 } else
853 return htonl(NFS4ERR_NOTSUPP);
854 return htonl(NFS4ERR_OP_ILLEGAL);
855 }
856 #else /* CONFIG_NFS_V4_2 */
857 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)858 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
859 {
860 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
861 }
862 #endif /* CONFIG_NFS_V4_2 */
863
864 static __be32
preprocess_nfs4_op(unsigned int op_nr,struct callback_op ** op)865 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
866 {
867 switch (op_nr) {
868 case OP_CB_GETATTR:
869 case OP_CB_RECALL:
870 *op = &callback_ops[op_nr];
871 break;
872 default:
873 return htonl(NFS4ERR_OP_ILLEGAL);
874 }
875
876 return htonl(NFS_OK);
877 }
878
process_op(int nop,struct svc_rqst * rqstp,struct cb_process_state * cps)879 static __be32 process_op(int nop, struct svc_rqst *rqstp,
880 struct cb_process_state *cps)
881 {
882 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
883 struct callback_op *op = &callback_ops[0];
884 unsigned int op_nr;
885 __be32 status;
886 long maxlen;
887 __be32 res;
888
889 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
890 if (unlikely(status))
891 return status;
892
893 switch (cps->minorversion) {
894 case 0:
895 status = preprocess_nfs4_op(op_nr, &op);
896 break;
897 case 1:
898 status = preprocess_nfs41_op(nop, op_nr, &op);
899 break;
900 case 2:
901 status = preprocess_nfs42_op(nop, op_nr, &op);
902 break;
903 default:
904 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
905 }
906
907 if (status == htonl(NFS4ERR_OP_ILLEGAL))
908 op_nr = OP_CB_ILLEGAL;
909 if (status)
910 goto encode_hdr;
911
912 if (cps->drc_status) {
913 status = cps->drc_status;
914 goto encode_hdr;
915 }
916
917 maxlen = xdr_out->end - xdr_out->p;
918 if (maxlen > 0 && maxlen < PAGE_SIZE) {
919 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
920 rqstp->rq_argp);
921 if (likely(status == 0))
922 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
923 cps);
924 } else
925 status = htonl(NFS4ERR_RESOURCE);
926
927 encode_hdr:
928 res = encode_op_hdr(xdr_out, op_nr, status);
929 if (unlikely(res))
930 return res;
931 if (op->encode_res != NULL && status == 0)
932 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
933 return status;
934 }
935
936 /*
937 * Decode, process and encode a COMPOUND
938 */
nfs4_callback_compound(struct svc_rqst * rqstp)939 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
940 {
941 struct cb_compound_hdr_arg hdr_arg = { 0 };
942 struct cb_compound_hdr_res hdr_res = { NULL };
943 struct cb_process_state cps = {
944 .drc_status = 0,
945 .clp = NULL,
946 .net = SVC_NET(rqstp),
947 };
948 unsigned int nops = 0;
949 __be32 status;
950
951 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
952 if (status == htonl(NFS4ERR_RESOURCE))
953 return rpc_garbage_args;
954
955 if (hdr_arg.minorversion == 0) {
956 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
957 if (!cps.clp) {
958 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
959 goto out_invalidcred;
960 }
961 if (!check_gss_callback_principal(cps.clp, rqstp)) {
962 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
963 nfs_put_client(cps.clp);
964 goto out_invalidcred;
965 }
966 svc_xprt_set_valid(rqstp->rq_xprt);
967 }
968
969 cps.minorversion = hdr_arg.minorversion;
970 hdr_res.taglen = hdr_arg.taglen;
971 hdr_res.tag = hdr_arg.tag;
972 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
973 if (cps.clp)
974 nfs_put_client(cps.clp);
975 return rpc_system_err;
976 }
977 while (status == 0 && nops != hdr_arg.nops) {
978 status = process_op(nops, rqstp, &cps);
979 nops++;
980 }
981
982 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
983 * resource error in cb_compound status without returning op */
984 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
985 status = htonl(NFS4ERR_RESOURCE);
986 nops--;
987 }
988
989 if (svc_is_backchannel(rqstp) && cps.clp) {
990 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval;
991 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries;
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 return rpc_success;
999
1000 out_invalidcred:
1001 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1002 rqstp->rq_auth_stat = rpc_autherr_badcred;
1003 return rpc_success;
1004 }
1005
1006 static int
nfs_callback_dispatch(struct svc_rqst * rqstp)1007 nfs_callback_dispatch(struct svc_rqst *rqstp)
1008 {
1009 const struct svc_procedure *procp = rqstp->rq_procinfo;
1010
1011 *rqstp->rq_accept_statp = procp->pc_func(rqstp);
1012 return 1;
1013 }
1014
1015 /*
1016 * Define NFS4 callback COMPOUND ops.
1017 */
1018 static struct callback_op callback_ops[] = {
1019 [0] = {
1020 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1021 },
1022 [OP_CB_GETATTR] = {
1023 .process_op = nfs4_callback_getattr,
1024 .decode_args = decode_getattr_args,
1025 .encode_res = encode_getattr_res,
1026 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1027 },
1028 [OP_CB_RECALL] = {
1029 .process_op = nfs4_callback_recall,
1030 .decode_args = decode_recall_args,
1031 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1032 },
1033 [OP_CB_LAYOUTRECALL] = {
1034 .process_op = nfs4_callback_layoutrecall,
1035 .decode_args = decode_layoutrecall_args,
1036 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1037 },
1038 [OP_CB_NOTIFY_DEVICEID] = {
1039 .process_op = nfs4_callback_devicenotify,
1040 .decode_args = decode_devicenotify_args,
1041 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1042 },
1043 [OP_CB_SEQUENCE] = {
1044 .process_op = nfs4_callback_sequence,
1045 .decode_args = decode_cb_sequence_args,
1046 .encode_res = encode_cb_sequence_res,
1047 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1048 },
1049 [OP_CB_RECALL_ANY] = {
1050 .process_op = nfs4_callback_recallany,
1051 .decode_args = decode_recallany_args,
1052 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1053 },
1054 [OP_CB_RECALL_SLOT] = {
1055 .process_op = nfs4_callback_recallslot,
1056 .decode_args = decode_recallslot_args,
1057 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1058 },
1059 [OP_CB_NOTIFY_LOCK] = {
1060 .process_op = nfs4_callback_notify_lock,
1061 .decode_args = decode_notify_lock_args,
1062 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1063 },
1064 #ifdef CONFIG_NFS_V4_2
1065 [OP_CB_OFFLOAD] = {
1066 .process_op = nfs4_callback_offload,
1067 .decode_args = decode_offload_args,
1068 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1069 },
1070 #endif /* CONFIG_NFS_V4_2 */
1071 };
1072
1073 /*
1074 * Define NFS4 callback procedures
1075 */
1076 static const struct svc_procedure nfs4_callback_procedures1[] = {
1077 [CB_NULL] = {
1078 .pc_func = nfs4_callback_null,
1079 .pc_encode = nfs4_encode_void,
1080 .pc_xdrressize = 1,
1081 .pc_name = "NULL",
1082 },
1083 [CB_COMPOUND] = {
1084 .pc_func = nfs4_callback_compound,
1085 .pc_encode = nfs4_encode_void,
1086 .pc_argsize = 256,
1087 .pc_argzero = 256,
1088 .pc_ressize = 256,
1089 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1090 .pc_name = "COMPOUND",
1091 }
1092 };
1093
1094 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1095 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]);
1096 const struct svc_version nfs4_callback_version1 = {
1097 .vs_vers = 1,
1098 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1099 .vs_proc = nfs4_callback_procedures1,
1100 .vs_count = nfs4_callback_count1,
1101 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1102 .vs_dispatch = nfs_callback_dispatch,
1103 .vs_hidden = true,
1104 .vs_need_cong_ctrl = true,
1105 };
1106
1107 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1108 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]);
1109 const struct svc_version nfs4_callback_version4 = {
1110 .vs_vers = 4,
1111 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1112 .vs_proc = nfs4_callback_procedures1,
1113 .vs_count = nfs4_callback_count4,
1114 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1115 .vs_dispatch = nfs_callback_dispatch,
1116 .vs_hidden = true,
1117 .vs_need_cong_ctrl = true,
1118 };
1119