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, ctime, mtime */\
29 (2 + 2 + 3 + 3) * 4)
30 #define CB_OP_RECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
31
32 #if defined(CONFIG_NFS_V4_1)
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 #endif /* CONFIG_NFS_V4_1 */
42 #ifdef CONFIG_NFS_V4_2
43 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
44 #endif /* CONFIG_NFS_V4_2 */
45
46 #define NFSDBG_FACILITY NFSDBG_CALLBACK
47
48 /* Internal error code */
49 #define NFS4ERR_RESOURCE_HDR 11050
50
51 struct callback_op {
52 __be32 (*process_op)(void *, void *, struct cb_process_state *);
53 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
54 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
55 const void *);
56 long res_maxsize;
57 };
58
59 static struct callback_op callback_ops[];
60
nfs4_callback_null(struct svc_rqst * rqstp)61 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
62 {
63 return htonl(NFS4_OK);
64 }
65
nfs4_decode_void(struct svc_rqst * rqstp,__be32 * p)66 static int nfs4_decode_void(struct svc_rqst *rqstp, __be32 *p)
67 {
68 return xdr_argsize_check(rqstp, p);
69 }
70
nfs4_encode_void(struct svc_rqst * rqstp,__be32 * p)71 static int nfs4_encode_void(struct svc_rqst *rqstp, __be32 *p)
72 {
73 return xdr_ressize_check(rqstp, p);
74 }
75
decode_string(struct xdr_stream * xdr,unsigned int * len,const char ** str,size_t maxlen)76 static __be32 decode_string(struct xdr_stream *xdr, unsigned int *len,
77 const char **str, size_t maxlen)
78 {
79 ssize_t err;
80
81 err = xdr_stream_decode_opaque_inline(xdr, (void **)str, maxlen);
82 if (err < 0)
83 return cpu_to_be32(NFS4ERR_RESOURCE);
84 *len = err;
85 return 0;
86 }
87
decode_fh(struct xdr_stream * xdr,struct nfs_fh * fh)88 static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
89 {
90 __be32 *p;
91
92 p = xdr_inline_decode(xdr, 4);
93 if (unlikely(p == NULL))
94 return htonl(NFS4ERR_RESOURCE);
95 fh->size = ntohl(*p);
96 if (fh->size > NFS4_FHSIZE)
97 return htonl(NFS4ERR_BADHANDLE);
98 p = xdr_inline_decode(xdr, fh->size);
99 if (unlikely(p == NULL))
100 return htonl(NFS4ERR_RESOURCE);
101 memcpy(&fh->data[0], p, fh->size);
102 memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
103 return 0;
104 }
105
decode_bitmap(struct xdr_stream * xdr,uint32_t * bitmap)106 static __be32 decode_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
107 {
108 __be32 *p;
109 unsigned int attrlen;
110
111 p = xdr_inline_decode(xdr, 4);
112 if (unlikely(p == NULL))
113 return htonl(NFS4ERR_RESOURCE);
114 attrlen = ntohl(*p);
115 p = xdr_inline_decode(xdr, attrlen << 2);
116 if (unlikely(p == NULL))
117 return htonl(NFS4ERR_RESOURCE);
118 if (likely(attrlen > 0))
119 bitmap[0] = ntohl(*p++);
120 if (attrlen > 1)
121 bitmap[1] = 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
206 #if defined(CONFIG_NFS_V4_1)
decode_layout_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)207 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
208 {
209 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
210 return decode_stateid(xdr, stateid);
211 }
212
decode_layoutrecall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)213 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
214 struct xdr_stream *xdr, void *argp)
215 {
216 struct cb_layoutrecallargs *args = argp;
217 __be32 *p;
218 __be32 status = 0;
219 uint32_t iomode;
220
221 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
222 if (unlikely(p == NULL))
223 return htonl(NFS4ERR_BADXDR);
224
225 args->cbl_layout_type = ntohl(*p++);
226 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
227 * as it is unusable and ignored with the other types.
228 */
229 iomode = ntohl(*p++);
230 args->cbl_layoutchanged = ntohl(*p++);
231 args->cbl_recall_type = ntohl(*p++);
232
233 if (args->cbl_recall_type == RETURN_FILE) {
234 args->cbl_range.iomode = iomode;
235 status = decode_fh(xdr, &args->cbl_fh);
236 if (unlikely(status != 0))
237 return status;
238
239 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
240 if (unlikely(p == NULL))
241 return htonl(NFS4ERR_BADXDR);
242 p = xdr_decode_hyper(p, &args->cbl_range.offset);
243 p = xdr_decode_hyper(p, &args->cbl_range.length);
244 return decode_layout_stateid(xdr, &args->cbl_stateid);
245 } else if (args->cbl_recall_type == RETURN_FSID) {
246 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
247 if (unlikely(p == NULL))
248 return htonl(NFS4ERR_BADXDR);
249 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
250 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
251 } else if (args->cbl_recall_type != RETURN_ALL)
252 return htonl(NFS4ERR_BADXDR);
253 return 0;
254 }
255
256 static
decode_devicenotify_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)257 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
258 struct xdr_stream *xdr,
259 void *argp)
260 {
261 struct cb_devicenotifyargs *args = argp;
262 uint32_t tmp, n, i;
263 __be32 *p;
264 __be32 status = 0;
265
266 /* Num of device notifications */
267 p = xdr_inline_decode(xdr, sizeof(uint32_t));
268 if (unlikely(p == NULL)) {
269 status = htonl(NFS4ERR_BADXDR);
270 goto out;
271 }
272 n = ntohl(*p++);
273 if (n == 0)
274 goto out;
275
276 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
277 if (!args->devs) {
278 status = htonl(NFS4ERR_DELAY);
279 goto out;
280 }
281
282 /* Decode each dev notification */
283 for (i = 0; i < n; i++) {
284 struct cb_devicenotifyitem *dev = &args->devs[i];
285
286 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
287 NFS4_DEVICEID4_SIZE);
288 if (unlikely(p == NULL)) {
289 status = htonl(NFS4ERR_BADXDR);
290 goto err;
291 }
292
293 tmp = ntohl(*p++); /* bitmap size */
294 if (tmp != 1) {
295 status = htonl(NFS4ERR_INVAL);
296 goto err;
297 }
298 dev->cbd_notify_type = ntohl(*p++);
299 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
300 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
301 status = htonl(NFS4ERR_INVAL);
302 goto err;
303 }
304
305 tmp = ntohl(*p++); /* opaque size */
306 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
307 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
308 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
309 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
310 status = htonl(NFS4ERR_INVAL);
311 goto err;
312 }
313 dev->cbd_layout_type = ntohl(*p++);
314 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
315 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
316
317 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
318 p = xdr_inline_decode(xdr, sizeof(uint32_t));
319 if (unlikely(p == NULL)) {
320 status = htonl(NFS4ERR_BADXDR);
321 goto err;
322 }
323 dev->cbd_immediate = ntohl(*p++);
324 } else {
325 dev->cbd_immediate = 0;
326 }
327
328 dprintk("%s: type %d layout 0x%x immediate %d\n",
329 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
330 dev->cbd_immediate);
331 }
332 args->ndevs = n;
333 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
334 return 0;
335 err:
336 kfree(args->devs);
337 out:
338 args->devs = NULL;
339 args->ndevs = 0;
340 dprintk("%s: status %d ndevs %d\n",
341 __func__, ntohl(status), args->ndevs);
342 return status;
343 }
344
decode_sessionid(struct xdr_stream * xdr,struct nfs4_sessionid * sid)345 static __be32 decode_sessionid(struct xdr_stream *xdr,
346 struct nfs4_sessionid *sid)
347 {
348 __be32 *p;
349
350 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
351 if (unlikely(p == NULL))
352 return htonl(NFS4ERR_RESOURCE);
353
354 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
355 return 0;
356 }
357
decode_rc_list(struct xdr_stream * xdr,struct referring_call_list * rc_list)358 static __be32 decode_rc_list(struct xdr_stream *xdr,
359 struct referring_call_list *rc_list)
360 {
361 __be32 *p;
362 int i;
363 __be32 status;
364
365 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
366 if (status)
367 goto out;
368
369 status = htonl(NFS4ERR_RESOURCE);
370 p = xdr_inline_decode(xdr, sizeof(uint32_t));
371 if (unlikely(p == NULL))
372 goto out;
373
374 rc_list->rcl_nrefcalls = ntohl(*p++);
375 if (rc_list->rcl_nrefcalls) {
376 p = xdr_inline_decode(xdr,
377 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
378 if (unlikely(p == NULL))
379 goto out;
380 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
381 sizeof(*rc_list->rcl_refcalls),
382 GFP_KERNEL);
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_array(args->csa_nrclists,
422 sizeof(*args->csa_rclists),
423 GFP_KERNEL);
424 if (unlikely(args->csa_rclists == NULL))
425 return htonl(NFS4ERR_RESOURCE);
426
427 for (i = 0; i < args->csa_nrclists; i++) {
428 status = decode_rc_list(xdr, &args->csa_rclists[i]);
429 if (status) {
430 args->csa_nrclists = i;
431 goto out_free;
432 }
433 }
434 }
435 return 0;
436
437 out_free:
438 for (i = 0; i < args->csa_nrclists; i++)
439 kfree(args->csa_rclists[i].rcl_refcalls);
440 kfree(args->csa_rclists);
441 return status;
442 }
443
decode_recallany_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)444 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
445 struct xdr_stream *xdr,
446 void *argp)
447 {
448 struct cb_recallanyargs *args = argp;
449 uint32_t bitmap[2];
450 __be32 *p, status;
451
452 p = xdr_inline_decode(xdr, 4);
453 if (unlikely(p == NULL))
454 return htonl(NFS4ERR_BADXDR);
455 args->craa_objs_to_keep = ntohl(*p++);
456 status = decode_bitmap(xdr, bitmap);
457 if (unlikely(status))
458 return status;
459 args->craa_type_mask = bitmap[0];
460
461 return 0;
462 }
463
decode_recallslot_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)464 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
465 struct xdr_stream *xdr,
466 void *argp)
467 {
468 struct cb_recallslotargs *args = argp;
469 __be32 *p;
470
471 p = xdr_inline_decode(xdr, 4);
472 if (unlikely(p == NULL))
473 return htonl(NFS4ERR_BADXDR);
474 args->crsa_target_highest_slotid = ntohl(*p++);
475 return 0;
476 }
477
decode_lockowner(struct xdr_stream * xdr,struct cb_notify_lock_args * args)478 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
479 {
480 __be32 *p;
481 unsigned int len;
482
483 p = xdr_inline_decode(xdr, 12);
484 if (unlikely(p == NULL))
485 return htonl(NFS4ERR_BADXDR);
486
487 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
488 len = be32_to_cpu(*p);
489
490 p = xdr_inline_decode(xdr, len);
491 if (unlikely(p == NULL))
492 return htonl(NFS4ERR_BADXDR);
493
494 /* Only try to decode if the length is right */
495 if (len == 20) {
496 p += 2; /* skip "lock id:" */
497 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
498 xdr_decode_hyper(p, &args->cbnl_owner.id);
499 args->cbnl_valid = true;
500 } else {
501 args->cbnl_owner.s_dev = 0;
502 args->cbnl_owner.id = 0;
503 args->cbnl_valid = false;
504 }
505 return 0;
506 }
507
decode_notify_lock_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)508 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
509 struct xdr_stream *xdr, void *argp)
510 {
511 struct cb_notify_lock_args *args = argp;
512 __be32 status;
513
514 status = decode_fh(xdr, &args->cbnl_fh);
515 if (unlikely(status != 0))
516 return status;
517 return decode_lockowner(xdr, args);
518 }
519
520 #endif /* CONFIG_NFS_V4_1 */
521 #ifdef CONFIG_NFS_V4_2
decode_write_response(struct xdr_stream * xdr,struct cb_offloadargs * args)522 static __be32 decode_write_response(struct xdr_stream *xdr,
523 struct cb_offloadargs *args)
524 {
525 __be32 *p;
526
527 /* skip the always zero field */
528 p = xdr_inline_decode(xdr, 4);
529 if (unlikely(!p))
530 goto out;
531 p++;
532
533 /* decode count, stable_how, verifier */
534 p = xdr_inline_decode(xdr, 8 + 4);
535 if (unlikely(!p))
536 goto out;
537 p = xdr_decode_hyper(p, &args->wr_count);
538 args->wr_writeverf.committed = be32_to_cpup(p);
539 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
540 if (likely(p)) {
541 memcpy(&args->wr_writeverf.verifier.data[0], p,
542 NFS4_VERIFIER_SIZE);
543 return 0;
544 }
545 out:
546 return htonl(NFS4ERR_RESOURCE);
547 }
548
decode_offload_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * data)549 static __be32 decode_offload_args(struct svc_rqst *rqstp,
550 struct xdr_stream *xdr,
551 void *data)
552 {
553 struct cb_offloadargs *args = data;
554 __be32 *p;
555 __be32 status;
556
557 /* decode fh */
558 status = decode_fh(xdr, &args->coa_fh);
559 if (unlikely(status != 0))
560 return status;
561
562 /* decode stateid */
563 status = decode_stateid(xdr, &args->coa_stateid);
564 if (unlikely(status != 0))
565 return status;
566
567 /* decode status */
568 p = xdr_inline_decode(xdr, 4);
569 if (unlikely(!p))
570 goto out;
571 args->error = ntohl(*p++);
572 if (!args->error) {
573 status = decode_write_response(xdr, args);
574 if (unlikely(status != 0))
575 return status;
576 } else {
577 p = xdr_inline_decode(xdr, 8);
578 if (unlikely(!p))
579 goto out;
580 p = xdr_decode_hyper(p, &args->wr_count);
581 }
582 return 0;
583 out:
584 return htonl(NFS4ERR_RESOURCE);
585 }
586 #endif /* CONFIG_NFS_V4_2 */
encode_string(struct xdr_stream * xdr,unsigned int len,const char * str)587 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
588 {
589 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
590 return cpu_to_be32(NFS4ERR_RESOURCE);
591 return 0;
592 }
593
encode_attr_bitmap(struct xdr_stream * xdr,const uint32_t * bitmap,size_t sz)594 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
595 {
596 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
597 return cpu_to_be32(NFS4ERR_RESOURCE);
598 return 0;
599 }
600
encode_attr_change(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t change)601 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
602 {
603 __be32 *p;
604
605 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
606 return 0;
607 p = xdr_reserve_space(xdr, 8);
608 if (unlikely(!p))
609 return htonl(NFS4ERR_RESOURCE);
610 p = xdr_encode_hyper(p, change);
611 return 0;
612 }
613
encode_attr_size(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t size)614 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
615 {
616 __be32 *p;
617
618 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
619 return 0;
620 p = xdr_reserve_space(xdr, 8);
621 if (unlikely(!p))
622 return htonl(NFS4ERR_RESOURCE);
623 p = xdr_encode_hyper(p, size);
624 return 0;
625 }
626
encode_attr_time(struct xdr_stream * xdr,const struct timespec64 * time)627 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
628 {
629 __be32 *p;
630
631 p = xdr_reserve_space(xdr, 12);
632 if (unlikely(!p))
633 return htonl(NFS4ERR_RESOURCE);
634 p = xdr_encode_hyper(p, time->tv_sec);
635 *p = htonl(time->tv_nsec);
636 return 0;
637 }
638
encode_attr_ctime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)639 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
640 {
641 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
642 return 0;
643 return encode_attr_time(xdr,time);
644 }
645
encode_attr_mtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)646 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
647 {
648 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
649 return 0;
650 return encode_attr_time(xdr,time);
651 }
652
encode_compound_hdr_res(struct xdr_stream * xdr,struct cb_compound_hdr_res * hdr)653 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
654 {
655 __be32 status;
656
657 hdr->status = xdr_reserve_space(xdr, 4);
658 if (unlikely(hdr->status == NULL))
659 return htonl(NFS4ERR_RESOURCE);
660 status = encode_string(xdr, hdr->taglen, hdr->tag);
661 if (unlikely(status != 0))
662 return status;
663 hdr->nops = xdr_reserve_space(xdr, 4);
664 if (unlikely(hdr->nops == NULL))
665 return htonl(NFS4ERR_RESOURCE);
666 return 0;
667 }
668
encode_op_hdr(struct xdr_stream * xdr,uint32_t op,__be32 res)669 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
670 {
671 __be32 *p;
672
673 p = xdr_reserve_space(xdr, 8);
674 if (unlikely(p == NULL))
675 return htonl(NFS4ERR_RESOURCE_HDR);
676 *p++ = htonl(op);
677 *p = res;
678 return 0;
679 }
680
encode_getattr_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)681 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
682 const void *resp)
683 {
684 const struct cb_getattrres *res = resp;
685 __be32 *savep = NULL;
686 __be32 status = res->status;
687
688 if (unlikely(status != 0))
689 goto out;
690 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
691 if (unlikely(status != 0))
692 goto out;
693 status = cpu_to_be32(NFS4ERR_RESOURCE);
694 savep = xdr_reserve_space(xdr, sizeof(*savep));
695 if (unlikely(!savep))
696 goto out;
697 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
698 if (unlikely(status != 0))
699 goto out;
700 status = encode_attr_size(xdr, res->bitmap, res->size);
701 if (unlikely(status != 0))
702 goto out;
703 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
704 if (unlikely(status != 0))
705 goto out;
706 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
707 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
708 out:
709 return status;
710 }
711
712 #if defined(CONFIG_NFS_V4_1)
713
encode_sessionid(struct xdr_stream * xdr,const struct nfs4_sessionid * sid)714 static __be32 encode_sessionid(struct xdr_stream *xdr,
715 const struct nfs4_sessionid *sid)
716 {
717 __be32 *p;
718
719 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
720 if (unlikely(p == NULL))
721 return htonl(NFS4ERR_RESOURCE);
722
723 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
724 return 0;
725 }
726
encode_cb_sequence_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)727 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
728 struct xdr_stream *xdr,
729 const void *resp)
730 {
731 const struct cb_sequenceres *res = resp;
732 __be32 *p;
733 __be32 status = res->csr_status;
734
735 if (unlikely(status != 0))
736 return status;
737
738 status = encode_sessionid(xdr, &res->csr_sessionid);
739 if (status)
740 return status;
741
742 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
743 if (unlikely(p == NULL))
744 return htonl(NFS4ERR_RESOURCE);
745
746 *p++ = htonl(res->csr_sequenceid);
747 *p++ = htonl(res->csr_slotid);
748 *p++ = htonl(res->csr_highestslotid);
749 *p++ = htonl(res->csr_target_highestslotid);
750 return 0;
751 }
752
753 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)754 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
755 {
756 if (op_nr == OP_CB_SEQUENCE) {
757 if (nop != 0)
758 return htonl(NFS4ERR_SEQUENCE_POS);
759 } else {
760 if (nop == 0)
761 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
762 }
763
764 switch (op_nr) {
765 case OP_CB_GETATTR:
766 case OP_CB_RECALL:
767 case OP_CB_SEQUENCE:
768 case OP_CB_RECALL_ANY:
769 case OP_CB_RECALL_SLOT:
770 case OP_CB_LAYOUTRECALL:
771 case OP_CB_NOTIFY_DEVICEID:
772 case OP_CB_NOTIFY_LOCK:
773 *op = &callback_ops[op_nr];
774 break;
775
776 case OP_CB_NOTIFY:
777 case OP_CB_PUSH_DELEG:
778 case OP_CB_RECALLABLE_OBJ_AVAIL:
779 case OP_CB_WANTS_CANCELLED:
780 return htonl(NFS4ERR_NOTSUPP);
781
782 default:
783 return htonl(NFS4ERR_OP_ILLEGAL);
784 }
785
786 return htonl(NFS_OK);
787 }
788
nfs4_callback_free_slot(struct nfs4_session * session,struct nfs4_slot * slot)789 static void nfs4_callback_free_slot(struct nfs4_session *session,
790 struct nfs4_slot *slot)
791 {
792 struct nfs4_slot_table *tbl = &session->bc_slot_table;
793
794 spin_lock(&tbl->slot_tbl_lock);
795 /*
796 * Let the state manager know callback processing done.
797 * A single slot, so highest used slotid is either 0 or -1
798 */
799 nfs4_free_slot(tbl, slot);
800 spin_unlock(&tbl->slot_tbl_lock);
801 }
802
nfs4_cb_free_slot(struct cb_process_state * cps)803 static void nfs4_cb_free_slot(struct cb_process_state *cps)
804 {
805 if (cps->slot) {
806 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
807 cps->slot = NULL;
808 }
809 }
810
811 #else /* CONFIG_NFS_V4_1 */
812
813 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)814 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
815 {
816 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
817 }
818
nfs4_cb_free_slot(struct cb_process_state * cps)819 static void nfs4_cb_free_slot(struct cb_process_state *cps)
820 {
821 }
822 #endif /* CONFIG_NFS_V4_1 */
823
824 #ifdef CONFIG_NFS_V4_2
825 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)826 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
827 {
828 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
829 if (status != htonl(NFS4ERR_OP_ILLEGAL))
830 return status;
831
832 if (op_nr == OP_CB_OFFLOAD) {
833 *op = &callback_ops[op_nr];
834 return htonl(NFS_OK);
835 } else
836 return htonl(NFS4ERR_NOTSUPP);
837 return htonl(NFS4ERR_OP_ILLEGAL);
838 }
839 #else /* CONFIG_NFS_V4_2 */
840 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)841 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
842 {
843 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
844 }
845 #endif /* CONFIG_NFS_V4_2 */
846
847 static __be32
preprocess_nfs4_op(unsigned int op_nr,struct callback_op ** op)848 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
849 {
850 switch (op_nr) {
851 case OP_CB_GETATTR:
852 case OP_CB_RECALL:
853 *op = &callback_ops[op_nr];
854 break;
855 default:
856 return htonl(NFS4ERR_OP_ILLEGAL);
857 }
858
859 return htonl(NFS_OK);
860 }
861
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)862 static __be32 process_op(int nop, struct svc_rqst *rqstp,
863 struct xdr_stream *xdr_in, void *argp,
864 struct xdr_stream *xdr_out, void *resp,
865 struct cb_process_state *cps)
866 {
867 struct callback_op *op = &callback_ops[0];
868 unsigned int op_nr;
869 __be32 status;
870 long maxlen;
871 __be32 res;
872
873 status = decode_op_hdr(xdr_in, &op_nr);
874 if (unlikely(status))
875 return status;
876
877 switch (cps->minorversion) {
878 case 0:
879 status = preprocess_nfs4_op(op_nr, &op);
880 break;
881 case 1:
882 status = preprocess_nfs41_op(nop, op_nr, &op);
883 break;
884 case 2:
885 status = preprocess_nfs42_op(nop, op_nr, &op);
886 break;
887 default:
888 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
889 }
890
891 if (status == htonl(NFS4ERR_OP_ILLEGAL))
892 op_nr = OP_CB_ILLEGAL;
893 if (status)
894 goto encode_hdr;
895
896 if (cps->drc_status) {
897 status = cps->drc_status;
898 goto encode_hdr;
899 }
900
901 maxlen = xdr_out->end - xdr_out->p;
902 if (maxlen > 0 && maxlen < PAGE_SIZE) {
903 status = op->decode_args(rqstp, xdr_in, argp);
904 if (likely(status == 0))
905 status = op->process_op(argp, resp, cps);
906 } else
907 status = htonl(NFS4ERR_RESOURCE);
908
909 encode_hdr:
910 res = encode_op_hdr(xdr_out, op_nr, status);
911 if (unlikely(res))
912 return res;
913 if (op->encode_res != NULL && status == 0)
914 status = op->encode_res(rqstp, xdr_out, resp);
915 return status;
916 }
917
918 /*
919 * Decode, process and encode a COMPOUND
920 */
nfs4_callback_compound(struct svc_rqst * rqstp)921 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
922 {
923 struct cb_compound_hdr_arg hdr_arg = { 0 };
924 struct cb_compound_hdr_res hdr_res = { NULL };
925 struct xdr_stream xdr_in, xdr_out;
926 __be32 *p, status;
927 struct cb_process_state cps = {
928 .drc_status = 0,
929 .clp = NULL,
930 .net = SVC_NET(rqstp),
931 };
932 unsigned int nops = 0;
933
934 xdr_init_decode(&xdr_in, &rqstp->rq_arg,
935 rqstp->rq_arg.head[0].iov_base, NULL);
936
937 p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
938 xdr_init_encode(&xdr_out, &rqstp->rq_res, p, NULL);
939
940 status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
941 if (status == htonl(NFS4ERR_RESOURCE))
942 return rpc_garbage_args;
943
944 if (hdr_arg.minorversion == 0) {
945 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
946 if (!cps.clp) {
947 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
948 goto out_invalidcred;
949 }
950 if (!check_gss_callback_principal(cps.clp, rqstp)) {
951 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
952 nfs_put_client(cps.clp);
953 goto out_invalidcred;
954 }
955 }
956
957 cps.minorversion = hdr_arg.minorversion;
958 hdr_res.taglen = hdr_arg.taglen;
959 hdr_res.tag = hdr_arg.tag;
960 if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0) {
961 if (cps.clp)
962 nfs_put_client(cps.clp);
963 return rpc_system_err;
964 }
965 while (status == 0 && nops != hdr_arg.nops) {
966 status = process_op(nops, rqstp, &xdr_in,
967 rqstp->rq_argp, &xdr_out, rqstp->rq_resp,
968 &cps);
969 nops++;
970 }
971
972 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
973 * resource error in cb_compound status without returning op */
974 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
975 status = htonl(NFS4ERR_RESOURCE);
976 nops--;
977 }
978
979 *hdr_res.status = status;
980 *hdr_res.nops = htonl(nops);
981 nfs4_cb_free_slot(&cps);
982 nfs_put_client(cps.clp);
983 return rpc_success;
984
985 out_invalidcred:
986 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
987 return svc_return_autherr(rqstp, rpc_autherr_badcred);
988 }
989
990 /*
991 * Define NFS4 callback COMPOUND ops.
992 */
993 static struct callback_op callback_ops[] = {
994 [0] = {
995 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
996 },
997 [OP_CB_GETATTR] = {
998 .process_op = nfs4_callback_getattr,
999 .decode_args = decode_getattr_args,
1000 .encode_res = encode_getattr_res,
1001 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1002 },
1003 [OP_CB_RECALL] = {
1004 .process_op = nfs4_callback_recall,
1005 .decode_args = decode_recall_args,
1006 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1007 },
1008 #if defined(CONFIG_NFS_V4_1)
1009 [OP_CB_LAYOUTRECALL] = {
1010 .process_op = nfs4_callback_layoutrecall,
1011 .decode_args = decode_layoutrecall_args,
1012 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1013 },
1014 [OP_CB_NOTIFY_DEVICEID] = {
1015 .process_op = nfs4_callback_devicenotify,
1016 .decode_args = decode_devicenotify_args,
1017 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1018 },
1019 [OP_CB_SEQUENCE] = {
1020 .process_op = nfs4_callback_sequence,
1021 .decode_args = decode_cb_sequence_args,
1022 .encode_res = encode_cb_sequence_res,
1023 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1024 },
1025 [OP_CB_RECALL_ANY] = {
1026 .process_op = nfs4_callback_recallany,
1027 .decode_args = decode_recallany_args,
1028 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1029 },
1030 [OP_CB_RECALL_SLOT] = {
1031 .process_op = nfs4_callback_recallslot,
1032 .decode_args = decode_recallslot_args,
1033 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1034 },
1035 [OP_CB_NOTIFY_LOCK] = {
1036 .process_op = nfs4_callback_notify_lock,
1037 .decode_args = decode_notify_lock_args,
1038 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1039 },
1040 #endif /* CONFIG_NFS_V4_1 */
1041 #ifdef CONFIG_NFS_V4_2
1042 [OP_CB_OFFLOAD] = {
1043 .process_op = nfs4_callback_offload,
1044 .decode_args = decode_offload_args,
1045 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1046 },
1047 #endif /* CONFIG_NFS_V4_2 */
1048 };
1049
1050 /*
1051 * Define NFS4 callback procedures
1052 */
1053 static const struct svc_procedure nfs4_callback_procedures1[] = {
1054 [CB_NULL] = {
1055 .pc_func = nfs4_callback_null,
1056 .pc_decode = nfs4_decode_void,
1057 .pc_encode = nfs4_encode_void,
1058 .pc_xdrressize = 1,
1059 },
1060 [CB_COMPOUND] = {
1061 .pc_func = nfs4_callback_compound,
1062 .pc_encode = nfs4_encode_void,
1063 .pc_argsize = 256,
1064 .pc_ressize = 256,
1065 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1066 }
1067 };
1068
1069 static unsigned int nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)];
1070 const struct svc_version nfs4_callback_version1 = {
1071 .vs_vers = 1,
1072 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1073 .vs_proc = nfs4_callback_procedures1,
1074 .vs_count = nfs4_callback_count1,
1075 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1076 .vs_dispatch = NULL,
1077 .vs_hidden = true,
1078 .vs_need_cong_ctrl = true,
1079 };
1080
1081 static unsigned int nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)];
1082 const struct svc_version nfs4_callback_version4 = {
1083 .vs_vers = 4,
1084 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1085 .vs_proc = nfs4_callback_procedures1,
1086 .vs_count = nfs4_callback_count4,
1087 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1088 .vs_dispatch = NULL,
1089 .vs_hidden = true,
1090 .vs_need_cong_ctrl = true,
1091 };
1092