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 #if defined(CONFIG_NFS_V4_1)
34 #define CB_OP_LAYOUTRECALL_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
35 #define CB_OP_DEVICENOTIFY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
36 #define CB_OP_SEQUENCE_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ + \
37 NFS4_MAX_SESSIONID_LEN + \
38 (1 + 3) * 4) // seqid, 3 slotids
39 #define CB_OP_RECALLANY_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
40 #define CB_OP_RECALLSLOT_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
41 #define CB_OP_NOTIFY_LOCK_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
42 #endif /* CONFIG_NFS_V4_1 */
43 #ifdef CONFIG_NFS_V4_2
44 #define CB_OP_OFFLOAD_RES_MAXSZ (CB_OP_HDR_RES_MAXSZ)
45 #endif /* CONFIG_NFS_V4_2 */
46
47 #define NFSDBG_FACILITY NFSDBG_CALLBACK
48
49 /* Internal error code */
50 #define NFS4ERR_RESOURCE_HDR 11050
51
52 struct callback_op {
53 __be32 (*process_op)(void *, void *, struct cb_process_state *);
54 __be32 (*decode_args)(struct svc_rqst *, struct xdr_stream *, void *);
55 __be32 (*encode_res)(struct svc_rqst *, struct xdr_stream *,
56 const void *);
57 long res_maxsize;
58 };
59
60 static struct callback_op callback_ops[];
61
nfs4_callback_null(struct svc_rqst * rqstp)62 static __be32 nfs4_callback_null(struct svc_rqst *rqstp)
63 {
64 return htonl(NFS4_OK);
65 }
66
67 /*
68 * svc_process_common() looks for an XDR encoder to know when
69 * not to drop a Reply.
70 */
nfs4_encode_void(struct svc_rqst * rqstp,struct xdr_stream * xdr)71 static bool nfs4_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
72 {
73 return true;
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 if (attrlen > 2)
123 bitmap[2] = ntohl(*p);
124 return 0;
125 }
126
decode_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)127 static __be32 decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
128 {
129 __be32 *p;
130
131 p = xdr_inline_decode(xdr, NFS4_STATEID_SIZE);
132 if (unlikely(p == NULL))
133 return htonl(NFS4ERR_RESOURCE);
134 memcpy(stateid->data, p, NFS4_STATEID_SIZE);
135 return 0;
136 }
137
decode_delegation_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)138 static __be32 decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
139 {
140 stateid->type = NFS4_DELEGATION_STATEID_TYPE;
141 return decode_stateid(xdr, stateid);
142 }
143
decode_compound_hdr_arg(struct xdr_stream * xdr,struct cb_compound_hdr_arg * hdr)144 static __be32 decode_compound_hdr_arg(struct xdr_stream *xdr, struct cb_compound_hdr_arg *hdr)
145 {
146 __be32 *p;
147 __be32 status;
148
149 status = decode_string(xdr, &hdr->taglen, &hdr->tag, CB_OP_TAGLEN_MAXSZ);
150 if (unlikely(status != 0))
151 return status;
152 p = xdr_inline_decode(xdr, 12);
153 if (unlikely(p == NULL))
154 return htonl(NFS4ERR_RESOURCE);
155 hdr->minorversion = ntohl(*p++);
156 /* Check for minor version support */
157 if (hdr->minorversion <= NFS4_MAX_MINOR_VERSION) {
158 hdr->cb_ident = ntohl(*p++); /* ignored by v4.1 and v4.2 */
159 } else {
160 pr_warn_ratelimited("NFS: %s: NFSv4 server callback with "
161 "illegal minor version %u!\n",
162 __func__, hdr->minorversion);
163 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
164 }
165 hdr->nops = ntohl(*p);
166 return 0;
167 }
168
decode_op_hdr(struct xdr_stream * xdr,unsigned int * op)169 static __be32 decode_op_hdr(struct xdr_stream *xdr, unsigned int *op)
170 {
171 __be32 *p;
172 p = xdr_inline_decode(xdr, 4);
173 if (unlikely(p == NULL))
174 return htonl(NFS4ERR_RESOURCE_HDR);
175 *op = ntohl(*p);
176 return 0;
177 }
178
decode_getattr_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)179 static __be32 decode_getattr_args(struct svc_rqst *rqstp,
180 struct xdr_stream *xdr, void *argp)
181 {
182 struct cb_getattrargs *args = argp;
183 __be32 status;
184
185 status = decode_fh(xdr, &args->fh);
186 if (unlikely(status != 0))
187 return status;
188 return decode_bitmap(xdr, args->bitmap);
189 }
190
decode_recall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)191 static __be32 decode_recall_args(struct svc_rqst *rqstp,
192 struct xdr_stream *xdr, void *argp)
193 {
194 struct cb_recallargs *args = argp;
195 __be32 *p;
196 __be32 status;
197
198 status = decode_delegation_stateid(xdr, &args->stateid);
199 if (unlikely(status != 0))
200 return status;
201 p = xdr_inline_decode(xdr, 4);
202 if (unlikely(p == NULL))
203 return htonl(NFS4ERR_RESOURCE);
204 args->truncate = ntohl(*p);
205 return decode_fh(xdr, &args->fh);
206 }
207
208 #if defined(CONFIG_NFS_V4_1)
decode_layout_stateid(struct xdr_stream * xdr,nfs4_stateid * stateid)209 static __be32 decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
210 {
211 stateid->type = NFS4_LAYOUT_STATEID_TYPE;
212 return decode_stateid(xdr, stateid);
213 }
214
decode_layoutrecall_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)215 static __be32 decode_layoutrecall_args(struct svc_rqst *rqstp,
216 struct xdr_stream *xdr, void *argp)
217 {
218 struct cb_layoutrecallargs *args = argp;
219 __be32 *p;
220 __be32 status = 0;
221 uint32_t iomode;
222
223 p = xdr_inline_decode(xdr, 4 * sizeof(uint32_t));
224 if (unlikely(p == NULL))
225 return htonl(NFS4ERR_BADXDR);
226
227 args->cbl_layout_type = ntohl(*p++);
228 /* Depite the spec's xdr, iomode really belongs in the FILE switch,
229 * as it is unusable and ignored with the other types.
230 */
231 iomode = ntohl(*p++);
232 args->cbl_layoutchanged = ntohl(*p++);
233 args->cbl_recall_type = ntohl(*p++);
234
235 if (args->cbl_recall_type == RETURN_FILE) {
236 args->cbl_range.iomode = iomode;
237 status = decode_fh(xdr, &args->cbl_fh);
238 if (unlikely(status != 0))
239 return status;
240
241 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
242 if (unlikely(p == NULL))
243 return htonl(NFS4ERR_BADXDR);
244 p = xdr_decode_hyper(p, &args->cbl_range.offset);
245 p = xdr_decode_hyper(p, &args->cbl_range.length);
246 return decode_layout_stateid(xdr, &args->cbl_stateid);
247 } else if (args->cbl_recall_type == RETURN_FSID) {
248 p = xdr_inline_decode(xdr, 2 * sizeof(uint64_t));
249 if (unlikely(p == NULL))
250 return htonl(NFS4ERR_BADXDR);
251 p = xdr_decode_hyper(p, &args->cbl_fsid.major);
252 p = xdr_decode_hyper(p, &args->cbl_fsid.minor);
253 } else if (args->cbl_recall_type != RETURN_ALL)
254 return htonl(NFS4ERR_BADXDR);
255 return 0;
256 }
257
258 static
decode_devicenotify_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)259 __be32 decode_devicenotify_args(struct svc_rqst *rqstp,
260 struct xdr_stream *xdr,
261 void *argp)
262 {
263 struct cb_devicenotifyargs *args = argp;
264 uint32_t tmp, n, i;
265 __be32 *p;
266 __be32 status = 0;
267
268 /* Num of device notifications */
269 p = xdr_inline_decode(xdr, sizeof(uint32_t));
270 if (unlikely(p == NULL)) {
271 status = htonl(NFS4ERR_BADXDR);
272 goto out;
273 }
274 n = ntohl(*p++);
275 if (n == 0)
276 goto out;
277
278 args->devs = kmalloc_array(n, sizeof(*args->devs), GFP_KERNEL);
279 if (!args->devs) {
280 status = htonl(NFS4ERR_DELAY);
281 goto out;
282 }
283
284 /* Decode each dev notification */
285 for (i = 0; i < n; i++) {
286 struct cb_devicenotifyitem *dev = &args->devs[i];
287
288 p = xdr_inline_decode(xdr, (4 * sizeof(uint32_t)) +
289 NFS4_DEVICEID4_SIZE);
290 if (unlikely(p == NULL)) {
291 status = htonl(NFS4ERR_BADXDR);
292 goto err;
293 }
294
295 tmp = ntohl(*p++); /* bitmap size */
296 if (tmp != 1) {
297 status = htonl(NFS4ERR_INVAL);
298 goto err;
299 }
300 dev->cbd_notify_type = ntohl(*p++);
301 if (dev->cbd_notify_type != NOTIFY_DEVICEID4_CHANGE &&
302 dev->cbd_notify_type != NOTIFY_DEVICEID4_DELETE) {
303 status = htonl(NFS4ERR_INVAL);
304 goto err;
305 }
306
307 tmp = ntohl(*p++); /* opaque size */
308 if (((dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE) &&
309 (tmp != NFS4_DEVICEID4_SIZE + 8)) ||
310 ((dev->cbd_notify_type == NOTIFY_DEVICEID4_DELETE) &&
311 (tmp != NFS4_DEVICEID4_SIZE + 4))) {
312 status = htonl(NFS4ERR_INVAL);
313 goto err;
314 }
315 dev->cbd_layout_type = ntohl(*p++);
316 memcpy(dev->cbd_dev_id.data, p, NFS4_DEVICEID4_SIZE);
317 p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
318
319 if (dev->cbd_layout_type == NOTIFY_DEVICEID4_CHANGE) {
320 p = xdr_inline_decode(xdr, sizeof(uint32_t));
321 if (unlikely(p == NULL)) {
322 status = htonl(NFS4ERR_BADXDR);
323 goto err;
324 }
325 dev->cbd_immediate = ntohl(*p++);
326 } else {
327 dev->cbd_immediate = 0;
328 }
329
330 dprintk("%s: type %d layout 0x%x immediate %d\n",
331 __func__, dev->cbd_notify_type, dev->cbd_layout_type,
332 dev->cbd_immediate);
333 }
334 args->ndevs = n;
335 dprintk("%s: ndevs %d\n", __func__, args->ndevs);
336 return 0;
337 err:
338 kfree(args->devs);
339 out:
340 args->devs = NULL;
341 args->ndevs = 0;
342 dprintk("%s: status %d ndevs %d\n",
343 __func__, ntohl(status), args->ndevs);
344 return status;
345 }
346
decode_sessionid(struct xdr_stream * xdr,struct nfs4_sessionid * sid)347 static __be32 decode_sessionid(struct xdr_stream *xdr,
348 struct nfs4_sessionid *sid)
349 {
350 __be32 *p;
351
352 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN);
353 if (unlikely(p == NULL))
354 return htonl(NFS4ERR_RESOURCE);
355
356 memcpy(sid->data, p, NFS4_MAX_SESSIONID_LEN);
357 return 0;
358 }
359
decode_rc_list(struct xdr_stream * xdr,struct referring_call_list * rc_list)360 static __be32 decode_rc_list(struct xdr_stream *xdr,
361 struct referring_call_list *rc_list)
362 {
363 __be32 *p;
364 int i;
365 __be32 status;
366
367 status = decode_sessionid(xdr, &rc_list->rcl_sessionid);
368 if (status)
369 goto out;
370
371 status = htonl(NFS4ERR_RESOURCE);
372 p = xdr_inline_decode(xdr, sizeof(uint32_t));
373 if (unlikely(p == NULL))
374 goto out;
375
376 rc_list->rcl_nrefcalls = ntohl(*p++);
377 if (rc_list->rcl_nrefcalls) {
378 if (unlikely(rc_list->rcl_nrefcalls > xdr->buf->len))
379 goto out;
380 p = xdr_inline_decode(xdr,
381 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
382 if (unlikely(p == NULL))
383 goto out;
384 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
385 sizeof(*rc_list->rcl_refcalls),
386 GFP_KERNEL);
387 if (unlikely(rc_list->rcl_refcalls == NULL))
388 goto out;
389 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
390 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
391 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
392 }
393 }
394 status = 0;
395
396 out:
397 return status;
398 }
399
decode_cb_sequence_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)400 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
401 struct xdr_stream *xdr,
402 void *argp)
403 {
404 struct cb_sequenceargs *args = argp;
405 __be32 *p;
406 int i;
407 __be32 status;
408
409 status = decode_sessionid(xdr, &args->csa_sessionid);
410 if (status)
411 return status;
412
413 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
414 if (unlikely(p == NULL))
415 return htonl(NFS4ERR_RESOURCE);
416
417 args->csa_addr = svc_addr(rqstp);
418 args->csa_sequenceid = ntohl(*p++);
419 args->csa_slotid = ntohl(*p++);
420 args->csa_highestslotid = ntohl(*p++);
421 args->csa_cachethis = ntohl(*p++);
422 args->csa_nrclists = ntohl(*p++);
423 args->csa_rclists = NULL;
424 if (args->csa_nrclists) {
425 args->csa_rclists = kmalloc_array(args->csa_nrclists,
426 sizeof(*args->csa_rclists),
427 GFP_KERNEL);
428 if (unlikely(args->csa_rclists == NULL))
429 return htonl(NFS4ERR_RESOURCE);
430
431 for (i = 0; i < args->csa_nrclists; i++) {
432 status = decode_rc_list(xdr, &args->csa_rclists[i]);
433 if (status) {
434 args->csa_nrclists = i;
435 goto out_free;
436 }
437 }
438 }
439 return 0;
440
441 out_free:
442 for (i = 0; i < args->csa_nrclists; i++)
443 kfree(args->csa_rclists[i].rcl_refcalls);
444 kfree(args->csa_rclists);
445 return status;
446 }
447
decode_recallany_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)448 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
449 struct xdr_stream *xdr,
450 void *argp)
451 {
452 struct cb_recallanyargs *args = argp;
453 uint32_t bitmap[3];
454 __be32 *p, status;
455
456 p = xdr_inline_decode(xdr, 4);
457 if (unlikely(p == NULL))
458 return htonl(NFS4ERR_BADXDR);
459 args->craa_objs_to_keep = ntohl(*p++);
460 status = decode_bitmap(xdr, bitmap);
461 if (unlikely(status))
462 return status;
463 args->craa_type_mask = bitmap[0];
464
465 return 0;
466 }
467
decode_recallslot_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)468 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
469 struct xdr_stream *xdr,
470 void *argp)
471 {
472 struct cb_recallslotargs *args = argp;
473 __be32 *p;
474
475 p = xdr_inline_decode(xdr, 4);
476 if (unlikely(p == NULL))
477 return htonl(NFS4ERR_BADXDR);
478 args->crsa_target_highest_slotid = ntohl(*p++);
479 return 0;
480 }
481
decode_lockowner(struct xdr_stream * xdr,struct cb_notify_lock_args * args)482 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
483 {
484 __be32 *p;
485 unsigned int len;
486
487 p = xdr_inline_decode(xdr, 12);
488 if (unlikely(p == NULL))
489 return htonl(NFS4ERR_BADXDR);
490
491 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
492 len = be32_to_cpu(*p);
493
494 p = xdr_inline_decode(xdr, len);
495 if (unlikely(p == NULL))
496 return htonl(NFS4ERR_BADXDR);
497
498 /* Only try to decode if the length is right */
499 if (len == 20) {
500 p += 2; /* skip "lock id:" */
501 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
502 xdr_decode_hyper(p, &args->cbnl_owner.id);
503 args->cbnl_valid = true;
504 } else {
505 args->cbnl_owner.s_dev = 0;
506 args->cbnl_owner.id = 0;
507 args->cbnl_valid = false;
508 }
509 return 0;
510 }
511
decode_notify_lock_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)512 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
513 struct xdr_stream *xdr, void *argp)
514 {
515 struct cb_notify_lock_args *args = argp;
516 __be32 status;
517
518 status = decode_fh(xdr, &args->cbnl_fh);
519 if (unlikely(status != 0))
520 return status;
521 return decode_lockowner(xdr, args);
522 }
523
524 #endif /* CONFIG_NFS_V4_1 */
525 #ifdef CONFIG_NFS_V4_2
decode_write_response(struct xdr_stream * xdr,struct cb_offloadargs * args)526 static __be32 decode_write_response(struct xdr_stream *xdr,
527 struct cb_offloadargs *args)
528 {
529 __be32 *p;
530
531 /* skip the always zero field */
532 p = xdr_inline_decode(xdr, 4);
533 if (unlikely(!p))
534 goto out;
535 p++;
536
537 /* decode count, stable_how, verifier */
538 p = xdr_inline_decode(xdr, 8 + 4);
539 if (unlikely(!p))
540 goto out;
541 p = xdr_decode_hyper(p, &args->wr_count);
542 args->wr_writeverf.committed = be32_to_cpup(p);
543 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
544 if (likely(p)) {
545 memcpy(&args->wr_writeverf.verifier.data[0], p,
546 NFS4_VERIFIER_SIZE);
547 return 0;
548 }
549 out:
550 return htonl(NFS4ERR_RESOURCE);
551 }
552
decode_offload_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * data)553 static __be32 decode_offload_args(struct svc_rqst *rqstp,
554 struct xdr_stream *xdr,
555 void *data)
556 {
557 struct cb_offloadargs *args = data;
558 __be32 *p;
559 __be32 status;
560
561 /* decode fh */
562 status = decode_fh(xdr, &args->coa_fh);
563 if (unlikely(status != 0))
564 return status;
565
566 /* decode stateid */
567 status = decode_stateid(xdr, &args->coa_stateid);
568 if (unlikely(status != 0))
569 return status;
570
571 /* decode status */
572 p = xdr_inline_decode(xdr, 4);
573 if (unlikely(!p))
574 goto out;
575 args->error = ntohl(*p++);
576 if (!args->error) {
577 status = decode_write_response(xdr, args);
578 if (unlikely(status != 0))
579 return status;
580 } else {
581 p = xdr_inline_decode(xdr, 8);
582 if (unlikely(!p))
583 goto out;
584 p = xdr_decode_hyper(p, &args->wr_count);
585 }
586 return 0;
587 out:
588 return htonl(NFS4ERR_RESOURCE);
589 }
590 #endif /* CONFIG_NFS_V4_2 */
encode_string(struct xdr_stream * xdr,unsigned int len,const char * str)591 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
592 {
593 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
594 return cpu_to_be32(NFS4ERR_RESOURCE);
595 return 0;
596 }
597
encode_attr_bitmap(struct xdr_stream * xdr,const uint32_t * bitmap,size_t sz)598 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
599 {
600 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
601 return cpu_to_be32(NFS4ERR_RESOURCE);
602 return 0;
603 }
604
encode_attr_change(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t change)605 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
606 {
607 __be32 *p;
608
609 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
610 return 0;
611 p = xdr_reserve_space(xdr, 8);
612 if (unlikely(!p))
613 return htonl(NFS4ERR_RESOURCE);
614 p = xdr_encode_hyper(p, change);
615 return 0;
616 }
617
encode_attr_size(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t size)618 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
619 {
620 __be32 *p;
621
622 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
623 return 0;
624 p = xdr_reserve_space(xdr, 8);
625 if (unlikely(!p))
626 return htonl(NFS4ERR_RESOURCE);
627 p = xdr_encode_hyper(p, size);
628 return 0;
629 }
630
encode_attr_time(struct xdr_stream * xdr,const struct timespec64 * time)631 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
632 {
633 __be32 *p;
634
635 p = xdr_reserve_space(xdr, 12);
636 if (unlikely(!p))
637 return htonl(NFS4ERR_RESOURCE);
638 p = xdr_encode_hyper(p, time->tv_sec);
639 *p = htonl(time->tv_nsec);
640 return 0;
641 }
642
encode_attr_atime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)643 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
644 {
645 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS))
646 return 0;
647 return encode_attr_time(xdr,time);
648 }
649
encode_attr_ctime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)650 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
651 {
652 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
653 return 0;
654 return encode_attr_time(xdr,time);
655 }
656
encode_attr_mtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)657 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
658 {
659 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
660 return 0;
661 return encode_attr_time(xdr,time);
662 }
663
encode_attr_delegatime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)664 static __be32 encode_attr_delegatime(struct xdr_stream *xdr,
665 const uint32_t *bitmap,
666 const struct timespec64 *time)
667 {
668 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS))
669 return 0;
670 return encode_attr_time(xdr,time);
671 }
672
encode_attr_delegmtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)673 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr,
674 const uint32_t *bitmap,
675 const struct timespec64 *time)
676 {
677 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY))
678 return 0;
679 return encode_attr_time(xdr,time);
680 }
681
encode_compound_hdr_res(struct xdr_stream * xdr,struct cb_compound_hdr_res * hdr)682 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
683 {
684 __be32 status;
685
686 hdr->status = xdr_reserve_space(xdr, 4);
687 if (unlikely(hdr->status == NULL))
688 return htonl(NFS4ERR_RESOURCE);
689 status = encode_string(xdr, hdr->taglen, hdr->tag);
690 if (unlikely(status != 0))
691 return status;
692 hdr->nops = xdr_reserve_space(xdr, 4);
693 if (unlikely(hdr->nops == NULL))
694 return htonl(NFS4ERR_RESOURCE);
695 return 0;
696 }
697
encode_op_hdr(struct xdr_stream * xdr,uint32_t op,__be32 res)698 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
699 {
700 __be32 *p;
701
702 p = xdr_reserve_space(xdr, 8);
703 if (unlikely(p == NULL))
704 return htonl(NFS4ERR_RESOURCE_HDR);
705 *p++ = htonl(op);
706 *p = res;
707 return 0;
708 }
709
encode_getattr_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)710 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
711 const void *resp)
712 {
713 const struct cb_getattrres *res = resp;
714 __be32 *savep = NULL;
715 __be32 status = res->status;
716
717 if (unlikely(status != 0))
718 goto out;
719 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
720 if (unlikely(status != 0))
721 goto out;
722 status = cpu_to_be32(NFS4ERR_RESOURCE);
723 savep = xdr_reserve_space(xdr, sizeof(*savep));
724 if (unlikely(!savep))
725 goto out;
726 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
727 if (unlikely(status != 0))
728 goto out;
729 status = encode_attr_size(xdr, res->bitmap, res->size);
730 if (unlikely(status != 0))
731 goto out;
732 status = encode_attr_atime(xdr, res->bitmap, &res->atime);
733 if (unlikely(status != 0))
734 goto out;
735 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
736 if (unlikely(status != 0))
737 goto out;
738 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
739 if (unlikely(status != 0))
740 goto out;
741 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime);
742 if (unlikely(status != 0))
743 goto out;
744 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime);
745 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
746 out:
747 return status;
748 }
749
750 #if defined(CONFIG_NFS_V4_1)
751
encode_sessionid(struct xdr_stream * xdr,const struct nfs4_sessionid * sid)752 static __be32 encode_sessionid(struct xdr_stream *xdr,
753 const struct nfs4_sessionid *sid)
754 {
755 __be32 *p;
756
757 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
758 if (unlikely(p == NULL))
759 return htonl(NFS4ERR_RESOURCE);
760
761 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
762 return 0;
763 }
764
encode_cb_sequence_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)765 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
766 struct xdr_stream *xdr,
767 const void *resp)
768 {
769 const struct cb_sequenceres *res = resp;
770 __be32 *p;
771 __be32 status = res->csr_status;
772
773 if (unlikely(status != 0))
774 return status;
775
776 status = encode_sessionid(xdr, &res->csr_sessionid);
777 if (status)
778 return status;
779
780 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
781 if (unlikely(p == NULL))
782 return htonl(NFS4ERR_RESOURCE);
783
784 *p++ = htonl(res->csr_sequenceid);
785 *p++ = htonl(res->csr_slotid);
786 *p++ = htonl(res->csr_highestslotid);
787 *p++ = htonl(res->csr_target_highestslotid);
788 return 0;
789 }
790
791 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)792 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
793 {
794 if (op_nr == OP_CB_SEQUENCE) {
795 if (nop != 0)
796 return htonl(NFS4ERR_SEQUENCE_POS);
797 } else {
798 if (nop == 0)
799 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
800 }
801
802 switch (op_nr) {
803 case OP_CB_GETATTR:
804 case OP_CB_RECALL:
805 case OP_CB_SEQUENCE:
806 case OP_CB_RECALL_ANY:
807 case OP_CB_RECALL_SLOT:
808 case OP_CB_LAYOUTRECALL:
809 case OP_CB_NOTIFY_DEVICEID:
810 case OP_CB_NOTIFY_LOCK:
811 *op = &callback_ops[op_nr];
812 break;
813
814 case OP_CB_NOTIFY:
815 case OP_CB_PUSH_DELEG:
816 case OP_CB_RECALLABLE_OBJ_AVAIL:
817 case OP_CB_WANTS_CANCELLED:
818 return htonl(NFS4ERR_NOTSUPP);
819
820 default:
821 return htonl(NFS4ERR_OP_ILLEGAL);
822 }
823
824 return htonl(NFS_OK);
825 }
826
nfs4_callback_free_slot(struct nfs4_session * session,struct nfs4_slot * slot)827 static void nfs4_callback_free_slot(struct nfs4_session *session,
828 struct nfs4_slot *slot)
829 {
830 struct nfs4_slot_table *tbl = &session->bc_slot_table;
831
832 spin_lock(&tbl->slot_tbl_lock);
833 /*
834 * Let the state manager know callback processing done.
835 * A single slot, so highest used slotid is either 0 or -1
836 */
837 nfs4_free_slot(tbl, slot);
838 spin_unlock(&tbl->slot_tbl_lock);
839 }
840
nfs4_cb_free_slot(struct cb_process_state * cps)841 static void nfs4_cb_free_slot(struct cb_process_state *cps)
842 {
843 if (cps->slot) {
844 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
845 cps->slot = NULL;
846 }
847 }
848
849 #else /* CONFIG_NFS_V4_1 */
850
851 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)852 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
853 {
854 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
855 }
856
nfs4_cb_free_slot(struct cb_process_state * cps)857 static void nfs4_cb_free_slot(struct cb_process_state *cps)
858 {
859 }
860 #endif /* CONFIG_NFS_V4_1 */
861
862 #ifdef CONFIG_NFS_V4_2
863 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)864 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
865 {
866 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
867 if (status != htonl(NFS4ERR_OP_ILLEGAL))
868 return status;
869
870 if (op_nr == OP_CB_OFFLOAD) {
871 *op = &callback_ops[op_nr];
872 return htonl(NFS_OK);
873 } else
874 return htonl(NFS4ERR_NOTSUPP);
875 return htonl(NFS4ERR_OP_ILLEGAL);
876 }
877 #else /* CONFIG_NFS_V4_2 */
878 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)879 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
880 {
881 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
882 }
883 #endif /* CONFIG_NFS_V4_2 */
884
885 static __be32
preprocess_nfs4_op(unsigned int op_nr,struct callback_op ** op)886 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
887 {
888 switch (op_nr) {
889 case OP_CB_GETATTR:
890 case OP_CB_RECALL:
891 *op = &callback_ops[op_nr];
892 break;
893 default:
894 return htonl(NFS4ERR_OP_ILLEGAL);
895 }
896
897 return htonl(NFS_OK);
898 }
899
process_op(int nop,struct svc_rqst * rqstp,struct cb_process_state * cps)900 static __be32 process_op(int nop, struct svc_rqst *rqstp,
901 struct cb_process_state *cps)
902 {
903 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
904 struct callback_op *op = &callback_ops[0];
905 unsigned int op_nr;
906 __be32 status;
907 long maxlen;
908 __be32 res;
909
910 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
911 if (unlikely(status))
912 return status;
913
914 switch (cps->minorversion) {
915 case 0:
916 status = preprocess_nfs4_op(op_nr, &op);
917 break;
918 case 1:
919 status = preprocess_nfs41_op(nop, op_nr, &op);
920 break;
921 case 2:
922 status = preprocess_nfs42_op(nop, op_nr, &op);
923 break;
924 default:
925 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
926 }
927
928 if (status == htonl(NFS4ERR_OP_ILLEGAL))
929 op_nr = OP_CB_ILLEGAL;
930 if (status)
931 goto encode_hdr;
932
933 if (cps->drc_status) {
934 status = cps->drc_status;
935 goto encode_hdr;
936 }
937
938 maxlen = xdr_out->end - xdr_out->p;
939 if (maxlen > 0 && maxlen < PAGE_SIZE) {
940 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
941 rqstp->rq_argp);
942 if (likely(status == 0))
943 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
944 cps);
945 } else
946 status = htonl(NFS4ERR_RESOURCE);
947
948 encode_hdr:
949 res = encode_op_hdr(xdr_out, op_nr, status);
950 if (unlikely(res))
951 return res;
952 if (op->encode_res != NULL && status == 0)
953 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
954 return status;
955 }
956
957 /*
958 * Decode, process and encode a COMPOUND
959 */
nfs4_callback_compound(struct svc_rqst * rqstp)960 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
961 {
962 struct cb_compound_hdr_arg hdr_arg = { 0 };
963 struct cb_compound_hdr_res hdr_res = { NULL };
964 struct cb_process_state cps = {
965 .drc_status = 0,
966 .clp = NULL,
967 .net = SVC_NET(rqstp),
968 };
969 unsigned int nops = 0;
970 __be32 status;
971
972 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
973 if (status == htonl(NFS4ERR_RESOURCE))
974 return rpc_garbage_args;
975
976 if (hdr_arg.minorversion == 0) {
977 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
978 if (!cps.clp) {
979 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
980 goto out_invalidcred;
981 }
982 if (!check_gss_callback_principal(cps.clp, rqstp)) {
983 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
984 nfs_put_client(cps.clp);
985 goto out_invalidcred;
986 }
987 }
988
989 cps.minorversion = hdr_arg.minorversion;
990 hdr_res.taglen = hdr_arg.taglen;
991 hdr_res.tag = hdr_arg.tag;
992 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
993 if (cps.clp)
994 nfs_put_client(cps.clp);
995 return rpc_system_err;
996 }
997 while (status == 0 && nops != hdr_arg.nops) {
998 status = process_op(nops, rqstp, &cps);
999 nops++;
1000 }
1001
1002 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
1003 * resource error in cb_compound status without returning op */
1004 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
1005 status = htonl(NFS4ERR_RESOURCE);
1006 nops--;
1007 }
1008
1009 if (svc_is_backchannel(rqstp) && cps.clp) {
1010 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval;
1011 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries;
1012 }
1013
1014 *hdr_res.status = status;
1015 *hdr_res.nops = htonl(nops);
1016 nfs4_cb_free_slot(&cps);
1017 nfs_put_client(cps.clp);
1018 return rpc_success;
1019
1020 out_invalidcred:
1021 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1022 rqstp->rq_auth_stat = rpc_autherr_badcred;
1023 return rpc_success;
1024 }
1025
1026 static int
nfs_callback_dispatch(struct svc_rqst * rqstp)1027 nfs_callback_dispatch(struct svc_rqst *rqstp)
1028 {
1029 const struct svc_procedure *procp = rqstp->rq_procinfo;
1030
1031 *rqstp->rq_accept_statp = procp->pc_func(rqstp);
1032 return 1;
1033 }
1034
1035 /*
1036 * Define NFS4 callback COMPOUND ops.
1037 */
1038 static struct callback_op callback_ops[] = {
1039 [0] = {
1040 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1041 },
1042 [OP_CB_GETATTR] = {
1043 .process_op = nfs4_callback_getattr,
1044 .decode_args = decode_getattr_args,
1045 .encode_res = encode_getattr_res,
1046 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1047 },
1048 [OP_CB_RECALL] = {
1049 .process_op = nfs4_callback_recall,
1050 .decode_args = decode_recall_args,
1051 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1052 },
1053 #if defined(CONFIG_NFS_V4_1)
1054 [OP_CB_LAYOUTRECALL] = {
1055 .process_op = nfs4_callback_layoutrecall,
1056 .decode_args = decode_layoutrecall_args,
1057 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1058 },
1059 [OP_CB_NOTIFY_DEVICEID] = {
1060 .process_op = nfs4_callback_devicenotify,
1061 .decode_args = decode_devicenotify_args,
1062 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1063 },
1064 [OP_CB_SEQUENCE] = {
1065 .process_op = nfs4_callback_sequence,
1066 .decode_args = decode_cb_sequence_args,
1067 .encode_res = encode_cb_sequence_res,
1068 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1069 },
1070 [OP_CB_RECALL_ANY] = {
1071 .process_op = nfs4_callback_recallany,
1072 .decode_args = decode_recallany_args,
1073 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1074 },
1075 [OP_CB_RECALL_SLOT] = {
1076 .process_op = nfs4_callback_recallslot,
1077 .decode_args = decode_recallslot_args,
1078 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1079 },
1080 [OP_CB_NOTIFY_LOCK] = {
1081 .process_op = nfs4_callback_notify_lock,
1082 .decode_args = decode_notify_lock_args,
1083 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1084 },
1085 #endif /* CONFIG_NFS_V4_1 */
1086 #ifdef CONFIG_NFS_V4_2
1087 [OP_CB_OFFLOAD] = {
1088 .process_op = nfs4_callback_offload,
1089 .decode_args = decode_offload_args,
1090 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1091 },
1092 #endif /* CONFIG_NFS_V4_2 */
1093 };
1094
1095 /*
1096 * Define NFS4 callback procedures
1097 */
1098 static const struct svc_procedure nfs4_callback_procedures1[] = {
1099 [CB_NULL] = {
1100 .pc_func = nfs4_callback_null,
1101 .pc_encode = nfs4_encode_void,
1102 .pc_xdrressize = 1,
1103 .pc_name = "NULL",
1104 },
1105 [CB_COMPOUND] = {
1106 .pc_func = nfs4_callback_compound,
1107 .pc_encode = nfs4_encode_void,
1108 .pc_argsize = 256,
1109 .pc_argzero = 256,
1110 .pc_ressize = 256,
1111 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1112 .pc_name = "COMPOUND",
1113 }
1114 };
1115
1116 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1117 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]);
1118 const struct svc_version nfs4_callback_version1 = {
1119 .vs_vers = 1,
1120 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1121 .vs_proc = nfs4_callback_procedures1,
1122 .vs_count = nfs4_callback_count1,
1123 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1124 .vs_dispatch = nfs_callback_dispatch,
1125 .vs_hidden = true,
1126 .vs_need_cong_ctrl = true,
1127 };
1128
1129 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1130 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]);
1131 const struct svc_version nfs4_callback_version4 = {
1132 .vs_vers = 4,
1133 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1134 .vs_proc = nfs4_callback_procedures1,
1135 .vs_count = nfs4_callback_count4,
1136 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1137 .vs_dispatch = nfs_callback_dispatch,
1138 .vs_hidden = true,
1139 .vs_need_cong_ctrl = true,
1140 };
1141