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 p = xdr_inline_decode(xdr,
379 rc_list->rcl_nrefcalls * 2 * sizeof(uint32_t));
380 if (unlikely(p == NULL))
381 goto out;
382 rc_list->rcl_refcalls = kmalloc_array(rc_list->rcl_nrefcalls,
383 sizeof(*rc_list->rcl_refcalls),
384 GFP_KERNEL);
385 if (unlikely(rc_list->rcl_refcalls == NULL))
386 goto out;
387 for (i = 0; i < rc_list->rcl_nrefcalls; i++) {
388 rc_list->rcl_refcalls[i].rc_sequenceid = ntohl(*p++);
389 rc_list->rcl_refcalls[i].rc_slotid = ntohl(*p++);
390 }
391 }
392 status = 0;
393
394 out:
395 return status;
396 }
397
decode_cb_sequence_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)398 static __be32 decode_cb_sequence_args(struct svc_rqst *rqstp,
399 struct xdr_stream *xdr,
400 void *argp)
401 {
402 struct cb_sequenceargs *args = argp;
403 __be32 *p;
404 int i;
405 __be32 status;
406
407 status = decode_sessionid(xdr, &args->csa_sessionid);
408 if (status)
409 return status;
410
411 p = xdr_inline_decode(xdr, 5 * sizeof(uint32_t));
412 if (unlikely(p == NULL))
413 return htonl(NFS4ERR_RESOURCE);
414
415 args->csa_addr = svc_addr(rqstp);
416 args->csa_sequenceid = ntohl(*p++);
417 args->csa_slotid = ntohl(*p++);
418 args->csa_highestslotid = ntohl(*p++);
419 args->csa_cachethis = ntohl(*p++);
420 args->csa_nrclists = ntohl(*p++);
421 args->csa_rclists = NULL;
422 if (args->csa_nrclists) {
423 args->csa_rclists = kmalloc_array(args->csa_nrclists,
424 sizeof(*args->csa_rclists),
425 GFP_KERNEL);
426 if (unlikely(args->csa_rclists == NULL))
427 return htonl(NFS4ERR_RESOURCE);
428
429 for (i = 0; i < args->csa_nrclists; i++) {
430 status = decode_rc_list(xdr, &args->csa_rclists[i]);
431 if (status) {
432 args->csa_nrclists = i;
433 goto out_free;
434 }
435 }
436 }
437 return 0;
438
439 out_free:
440 for (i = 0; i < args->csa_nrclists; i++)
441 kfree(args->csa_rclists[i].rcl_refcalls);
442 kfree(args->csa_rclists);
443 return status;
444 }
445
decode_recallany_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)446 static __be32 decode_recallany_args(struct svc_rqst *rqstp,
447 struct xdr_stream *xdr,
448 void *argp)
449 {
450 struct cb_recallanyargs *args = argp;
451 uint32_t bitmap[3];
452 __be32 *p, status;
453
454 p = xdr_inline_decode(xdr, 4);
455 if (unlikely(p == NULL))
456 return htonl(NFS4ERR_BADXDR);
457 args->craa_objs_to_keep = ntohl(*p++);
458 status = decode_bitmap(xdr, bitmap);
459 if (unlikely(status))
460 return status;
461 args->craa_type_mask = bitmap[0];
462
463 return 0;
464 }
465
decode_recallslot_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)466 static __be32 decode_recallslot_args(struct svc_rqst *rqstp,
467 struct xdr_stream *xdr,
468 void *argp)
469 {
470 struct cb_recallslotargs *args = argp;
471 __be32 *p;
472
473 p = xdr_inline_decode(xdr, 4);
474 if (unlikely(p == NULL))
475 return htonl(NFS4ERR_BADXDR);
476 args->crsa_target_highest_slotid = ntohl(*p++);
477 return 0;
478 }
479
decode_lockowner(struct xdr_stream * xdr,struct cb_notify_lock_args * args)480 static __be32 decode_lockowner(struct xdr_stream *xdr, struct cb_notify_lock_args *args)
481 {
482 __be32 *p;
483 unsigned int len;
484
485 p = xdr_inline_decode(xdr, 12);
486 if (unlikely(p == NULL))
487 return htonl(NFS4ERR_BADXDR);
488
489 p = xdr_decode_hyper(p, &args->cbnl_owner.clientid);
490 len = be32_to_cpu(*p);
491
492 p = xdr_inline_decode(xdr, len);
493 if (unlikely(p == NULL))
494 return htonl(NFS4ERR_BADXDR);
495
496 /* Only try to decode if the length is right */
497 if (len == 20) {
498 p += 2; /* skip "lock id:" */
499 args->cbnl_owner.s_dev = be32_to_cpu(*p++);
500 xdr_decode_hyper(p, &args->cbnl_owner.id);
501 args->cbnl_valid = true;
502 } else {
503 args->cbnl_owner.s_dev = 0;
504 args->cbnl_owner.id = 0;
505 args->cbnl_valid = false;
506 }
507 return 0;
508 }
509
decode_notify_lock_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * argp)510 static __be32 decode_notify_lock_args(struct svc_rqst *rqstp,
511 struct xdr_stream *xdr, void *argp)
512 {
513 struct cb_notify_lock_args *args = argp;
514 __be32 status;
515
516 status = decode_fh(xdr, &args->cbnl_fh);
517 if (unlikely(status != 0))
518 return status;
519 return decode_lockowner(xdr, args);
520 }
521
522 #endif /* CONFIG_NFS_V4_1 */
523 #ifdef CONFIG_NFS_V4_2
decode_write_response(struct xdr_stream * xdr,struct cb_offloadargs * args)524 static __be32 decode_write_response(struct xdr_stream *xdr,
525 struct cb_offloadargs *args)
526 {
527 __be32 *p;
528
529 /* skip the always zero field */
530 p = xdr_inline_decode(xdr, 4);
531 if (unlikely(!p))
532 goto out;
533 p++;
534
535 /* decode count, stable_how, verifier */
536 p = xdr_inline_decode(xdr, 8 + 4);
537 if (unlikely(!p))
538 goto out;
539 p = xdr_decode_hyper(p, &args->wr_count);
540 args->wr_writeverf.committed = be32_to_cpup(p);
541 p = xdr_inline_decode(xdr, NFS4_VERIFIER_SIZE);
542 if (likely(p)) {
543 memcpy(&args->wr_writeverf.verifier.data[0], p,
544 NFS4_VERIFIER_SIZE);
545 return 0;
546 }
547 out:
548 return htonl(NFS4ERR_RESOURCE);
549 }
550
decode_offload_args(struct svc_rqst * rqstp,struct xdr_stream * xdr,void * data)551 static __be32 decode_offload_args(struct svc_rqst *rqstp,
552 struct xdr_stream *xdr,
553 void *data)
554 {
555 struct cb_offloadargs *args = data;
556 __be32 *p;
557 __be32 status;
558
559 /* decode fh */
560 status = decode_fh(xdr, &args->coa_fh);
561 if (unlikely(status != 0))
562 return status;
563
564 /* decode stateid */
565 status = decode_stateid(xdr, &args->coa_stateid);
566 if (unlikely(status != 0))
567 return status;
568
569 /* decode status */
570 p = xdr_inline_decode(xdr, 4);
571 if (unlikely(!p))
572 goto out;
573 args->error = ntohl(*p++);
574 if (!args->error) {
575 status = decode_write_response(xdr, args);
576 if (unlikely(status != 0))
577 return status;
578 } else {
579 p = xdr_inline_decode(xdr, 8);
580 if (unlikely(!p))
581 goto out;
582 p = xdr_decode_hyper(p, &args->wr_count);
583 }
584 return 0;
585 out:
586 return htonl(NFS4ERR_RESOURCE);
587 }
588 #endif /* CONFIG_NFS_V4_2 */
encode_string(struct xdr_stream * xdr,unsigned int len,const char * str)589 static __be32 encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
590 {
591 if (unlikely(xdr_stream_encode_opaque(xdr, str, len) < 0))
592 return cpu_to_be32(NFS4ERR_RESOURCE);
593 return 0;
594 }
595
encode_attr_bitmap(struct xdr_stream * xdr,const uint32_t * bitmap,size_t sz)596 static __be32 encode_attr_bitmap(struct xdr_stream *xdr, const uint32_t *bitmap, size_t sz)
597 {
598 if (xdr_stream_encode_uint32_array(xdr, bitmap, sz) < 0)
599 return cpu_to_be32(NFS4ERR_RESOURCE);
600 return 0;
601 }
602
encode_attr_change(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t change)603 static __be32 encode_attr_change(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t change)
604 {
605 __be32 *p;
606
607 if (!(bitmap[0] & FATTR4_WORD0_CHANGE))
608 return 0;
609 p = xdr_reserve_space(xdr, 8);
610 if (unlikely(!p))
611 return htonl(NFS4ERR_RESOURCE);
612 p = xdr_encode_hyper(p, change);
613 return 0;
614 }
615
encode_attr_size(struct xdr_stream * xdr,const uint32_t * bitmap,uint64_t size)616 static __be32 encode_attr_size(struct xdr_stream *xdr, const uint32_t *bitmap, uint64_t size)
617 {
618 __be32 *p;
619
620 if (!(bitmap[0] & FATTR4_WORD0_SIZE))
621 return 0;
622 p = xdr_reserve_space(xdr, 8);
623 if (unlikely(!p))
624 return htonl(NFS4ERR_RESOURCE);
625 p = xdr_encode_hyper(p, size);
626 return 0;
627 }
628
encode_attr_time(struct xdr_stream * xdr,const struct timespec64 * time)629 static __be32 encode_attr_time(struct xdr_stream *xdr, const struct timespec64 *time)
630 {
631 __be32 *p;
632
633 p = xdr_reserve_space(xdr, 12);
634 if (unlikely(!p))
635 return htonl(NFS4ERR_RESOURCE);
636 p = xdr_encode_hyper(p, time->tv_sec);
637 *p = htonl(time->tv_nsec);
638 return 0;
639 }
640
encode_attr_atime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)641 static __be32 encode_attr_atime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
642 {
643 if (!(bitmap[1] & FATTR4_WORD1_TIME_ACCESS))
644 return 0;
645 return encode_attr_time(xdr,time);
646 }
647
encode_attr_ctime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)648 static __be32 encode_attr_ctime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
649 {
650 if (!(bitmap[1] & FATTR4_WORD1_TIME_METADATA))
651 return 0;
652 return encode_attr_time(xdr,time);
653 }
654
encode_attr_mtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)655 static __be32 encode_attr_mtime(struct xdr_stream *xdr, const uint32_t *bitmap, const struct timespec64 *time)
656 {
657 if (!(bitmap[1] & FATTR4_WORD1_TIME_MODIFY))
658 return 0;
659 return encode_attr_time(xdr,time);
660 }
661
encode_attr_delegatime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)662 static __be32 encode_attr_delegatime(struct xdr_stream *xdr,
663 const uint32_t *bitmap,
664 const struct timespec64 *time)
665 {
666 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS))
667 return 0;
668 return encode_attr_time(xdr,time);
669 }
670
encode_attr_delegmtime(struct xdr_stream * xdr,const uint32_t * bitmap,const struct timespec64 * time)671 static __be32 encode_attr_delegmtime(struct xdr_stream *xdr,
672 const uint32_t *bitmap,
673 const struct timespec64 *time)
674 {
675 if (!(bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY))
676 return 0;
677 return encode_attr_time(xdr,time);
678 }
679
encode_compound_hdr_res(struct xdr_stream * xdr,struct cb_compound_hdr_res * hdr)680 static __be32 encode_compound_hdr_res(struct xdr_stream *xdr, struct cb_compound_hdr_res *hdr)
681 {
682 __be32 status;
683
684 hdr->status = xdr_reserve_space(xdr, 4);
685 if (unlikely(hdr->status == NULL))
686 return htonl(NFS4ERR_RESOURCE);
687 status = encode_string(xdr, hdr->taglen, hdr->tag);
688 if (unlikely(status != 0))
689 return status;
690 hdr->nops = xdr_reserve_space(xdr, 4);
691 if (unlikely(hdr->nops == NULL))
692 return htonl(NFS4ERR_RESOURCE);
693 return 0;
694 }
695
encode_op_hdr(struct xdr_stream * xdr,uint32_t op,__be32 res)696 static __be32 encode_op_hdr(struct xdr_stream *xdr, uint32_t op, __be32 res)
697 {
698 __be32 *p;
699
700 p = xdr_reserve_space(xdr, 8);
701 if (unlikely(p == NULL))
702 return htonl(NFS4ERR_RESOURCE_HDR);
703 *p++ = htonl(op);
704 *p = res;
705 return 0;
706 }
707
encode_getattr_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)708 static __be32 encode_getattr_res(struct svc_rqst *rqstp, struct xdr_stream *xdr,
709 const void *resp)
710 {
711 const struct cb_getattrres *res = resp;
712 __be32 *savep = NULL;
713 __be32 status = res->status;
714
715 if (unlikely(status != 0))
716 goto out;
717 status = encode_attr_bitmap(xdr, res->bitmap, ARRAY_SIZE(res->bitmap));
718 if (unlikely(status != 0))
719 goto out;
720 status = cpu_to_be32(NFS4ERR_RESOURCE);
721 savep = xdr_reserve_space(xdr, sizeof(*savep));
722 if (unlikely(!savep))
723 goto out;
724 status = encode_attr_change(xdr, res->bitmap, res->change_attr);
725 if (unlikely(status != 0))
726 goto out;
727 status = encode_attr_size(xdr, res->bitmap, res->size);
728 if (unlikely(status != 0))
729 goto out;
730 status = encode_attr_atime(xdr, res->bitmap, &res->atime);
731 if (unlikely(status != 0))
732 goto out;
733 status = encode_attr_ctime(xdr, res->bitmap, &res->ctime);
734 if (unlikely(status != 0))
735 goto out;
736 status = encode_attr_mtime(xdr, res->bitmap, &res->mtime);
737 if (unlikely(status != 0))
738 goto out;
739 status = encode_attr_delegatime(xdr, res->bitmap, &res->atime);
740 if (unlikely(status != 0))
741 goto out;
742 status = encode_attr_delegmtime(xdr, res->bitmap, &res->mtime);
743 *savep = htonl((unsigned int)((char *)xdr->p - (char *)(savep+1)));
744 out:
745 return status;
746 }
747
748 #if defined(CONFIG_NFS_V4_1)
749
encode_sessionid(struct xdr_stream * xdr,const struct nfs4_sessionid * sid)750 static __be32 encode_sessionid(struct xdr_stream *xdr,
751 const struct nfs4_sessionid *sid)
752 {
753 __be32 *p;
754
755 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
756 if (unlikely(p == NULL))
757 return htonl(NFS4ERR_RESOURCE);
758
759 memcpy(p, sid, NFS4_MAX_SESSIONID_LEN);
760 return 0;
761 }
762
encode_cb_sequence_res(struct svc_rqst * rqstp,struct xdr_stream * xdr,const void * resp)763 static __be32 encode_cb_sequence_res(struct svc_rqst *rqstp,
764 struct xdr_stream *xdr,
765 const void *resp)
766 {
767 const struct cb_sequenceres *res = resp;
768 __be32 *p;
769 __be32 status = res->csr_status;
770
771 if (unlikely(status != 0))
772 return status;
773
774 status = encode_sessionid(xdr, &res->csr_sessionid);
775 if (status)
776 return status;
777
778 p = xdr_reserve_space(xdr, 4 * sizeof(uint32_t));
779 if (unlikely(p == NULL))
780 return htonl(NFS4ERR_RESOURCE);
781
782 *p++ = htonl(res->csr_sequenceid);
783 *p++ = htonl(res->csr_slotid);
784 *p++ = htonl(res->csr_highestslotid);
785 *p++ = htonl(res->csr_target_highestslotid);
786 return 0;
787 }
788
789 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)790 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
791 {
792 if (op_nr == OP_CB_SEQUENCE) {
793 if (nop != 0)
794 return htonl(NFS4ERR_SEQUENCE_POS);
795 } else {
796 if (nop == 0)
797 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
798 }
799
800 switch (op_nr) {
801 case OP_CB_GETATTR:
802 case OP_CB_RECALL:
803 case OP_CB_SEQUENCE:
804 case OP_CB_RECALL_ANY:
805 case OP_CB_RECALL_SLOT:
806 case OP_CB_LAYOUTRECALL:
807 case OP_CB_NOTIFY_DEVICEID:
808 case OP_CB_NOTIFY_LOCK:
809 *op = &callback_ops[op_nr];
810 break;
811
812 case OP_CB_NOTIFY:
813 case OP_CB_PUSH_DELEG:
814 case OP_CB_RECALLABLE_OBJ_AVAIL:
815 case OP_CB_WANTS_CANCELLED:
816 return htonl(NFS4ERR_NOTSUPP);
817
818 default:
819 return htonl(NFS4ERR_OP_ILLEGAL);
820 }
821
822 return htonl(NFS_OK);
823 }
824
nfs4_callback_free_slot(struct nfs4_session * session,struct nfs4_slot * slot)825 static void nfs4_callback_free_slot(struct nfs4_session *session,
826 struct nfs4_slot *slot)
827 {
828 struct nfs4_slot_table *tbl = &session->bc_slot_table;
829
830 spin_lock(&tbl->slot_tbl_lock);
831 /*
832 * Let the state manager know callback processing done.
833 * A single slot, so highest used slotid is either 0 or -1
834 */
835 nfs4_free_slot(tbl, slot);
836 spin_unlock(&tbl->slot_tbl_lock);
837 }
838
nfs4_cb_free_slot(struct cb_process_state * cps)839 static void nfs4_cb_free_slot(struct cb_process_state *cps)
840 {
841 if (cps->slot) {
842 nfs4_callback_free_slot(cps->clp->cl_session, cps->slot);
843 cps->slot = NULL;
844 }
845 }
846
847 #else /* CONFIG_NFS_V4_1 */
848
849 static __be32
preprocess_nfs41_op(int nop,unsigned int op_nr,struct callback_op ** op)850 preprocess_nfs41_op(int nop, unsigned int op_nr, struct callback_op **op)
851 {
852 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
853 }
854
nfs4_cb_free_slot(struct cb_process_state * cps)855 static void nfs4_cb_free_slot(struct cb_process_state *cps)
856 {
857 }
858 #endif /* CONFIG_NFS_V4_1 */
859
860 #ifdef CONFIG_NFS_V4_2
861 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)862 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
863 {
864 __be32 status = preprocess_nfs41_op(nop, op_nr, op);
865 if (status != htonl(NFS4ERR_OP_ILLEGAL))
866 return status;
867
868 if (op_nr == OP_CB_OFFLOAD) {
869 *op = &callback_ops[op_nr];
870 return htonl(NFS_OK);
871 } else
872 return htonl(NFS4ERR_NOTSUPP);
873 return htonl(NFS4ERR_OP_ILLEGAL);
874 }
875 #else /* CONFIG_NFS_V4_2 */
876 static __be32
preprocess_nfs42_op(int nop,unsigned int op_nr,struct callback_op ** op)877 preprocess_nfs42_op(int nop, unsigned int op_nr, struct callback_op **op)
878 {
879 return htonl(NFS4ERR_MINOR_VERS_MISMATCH);
880 }
881 #endif /* CONFIG_NFS_V4_2 */
882
883 static __be32
preprocess_nfs4_op(unsigned int op_nr,struct callback_op ** op)884 preprocess_nfs4_op(unsigned int op_nr, struct callback_op **op)
885 {
886 switch (op_nr) {
887 case OP_CB_GETATTR:
888 case OP_CB_RECALL:
889 *op = &callback_ops[op_nr];
890 break;
891 default:
892 return htonl(NFS4ERR_OP_ILLEGAL);
893 }
894
895 return htonl(NFS_OK);
896 }
897
process_op(int nop,struct svc_rqst * rqstp,struct cb_process_state * cps)898 static __be32 process_op(int nop, struct svc_rqst *rqstp,
899 struct cb_process_state *cps)
900 {
901 struct xdr_stream *xdr_out = &rqstp->rq_res_stream;
902 struct callback_op *op = &callback_ops[0];
903 unsigned int op_nr;
904 __be32 status;
905 long maxlen;
906 __be32 res;
907
908 status = decode_op_hdr(&rqstp->rq_arg_stream, &op_nr);
909 if (unlikely(status))
910 return status;
911
912 switch (cps->minorversion) {
913 case 0:
914 status = preprocess_nfs4_op(op_nr, &op);
915 break;
916 case 1:
917 status = preprocess_nfs41_op(nop, op_nr, &op);
918 break;
919 case 2:
920 status = preprocess_nfs42_op(nop, op_nr, &op);
921 break;
922 default:
923 status = htonl(NFS4ERR_MINOR_VERS_MISMATCH);
924 }
925
926 if (status == htonl(NFS4ERR_OP_ILLEGAL))
927 op_nr = OP_CB_ILLEGAL;
928 if (status)
929 goto encode_hdr;
930
931 if (cps->drc_status) {
932 status = cps->drc_status;
933 goto encode_hdr;
934 }
935
936 maxlen = xdr_out->end - xdr_out->p;
937 if (maxlen > 0 && maxlen < PAGE_SIZE) {
938 status = op->decode_args(rqstp, &rqstp->rq_arg_stream,
939 rqstp->rq_argp);
940 if (likely(status == 0))
941 status = op->process_op(rqstp->rq_argp, rqstp->rq_resp,
942 cps);
943 } else
944 status = htonl(NFS4ERR_RESOURCE);
945
946 encode_hdr:
947 res = encode_op_hdr(xdr_out, op_nr, status);
948 if (unlikely(res))
949 return res;
950 if (op->encode_res != NULL && status == 0)
951 status = op->encode_res(rqstp, xdr_out, rqstp->rq_resp);
952 return status;
953 }
954
955 /*
956 * Decode, process and encode a COMPOUND
957 */
nfs4_callback_compound(struct svc_rqst * rqstp)958 static __be32 nfs4_callback_compound(struct svc_rqst *rqstp)
959 {
960 struct cb_compound_hdr_arg hdr_arg = { 0 };
961 struct cb_compound_hdr_res hdr_res = { NULL };
962 struct cb_process_state cps = {
963 .drc_status = 0,
964 .clp = NULL,
965 .net = SVC_NET(rqstp),
966 };
967 unsigned int nops = 0;
968 __be32 status;
969
970 status = decode_compound_hdr_arg(&rqstp->rq_arg_stream, &hdr_arg);
971 if (status == htonl(NFS4ERR_RESOURCE))
972 return rpc_garbage_args;
973
974 if (hdr_arg.minorversion == 0) {
975 cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident);
976 if (!cps.clp) {
977 trace_nfs_cb_no_clp(rqstp->rq_xid, hdr_arg.cb_ident);
978 goto out_invalidcred;
979 }
980 if (!check_gss_callback_principal(cps.clp, rqstp)) {
981 trace_nfs_cb_badprinc(rqstp->rq_xid, hdr_arg.cb_ident);
982 nfs_put_client(cps.clp);
983 goto out_invalidcred;
984 }
985 }
986
987 cps.minorversion = hdr_arg.minorversion;
988 hdr_res.taglen = hdr_arg.taglen;
989 hdr_res.tag = hdr_arg.tag;
990 if (encode_compound_hdr_res(&rqstp->rq_res_stream, &hdr_res) != 0) {
991 if (cps.clp)
992 nfs_put_client(cps.clp);
993 return rpc_system_err;
994 }
995 while (status == 0 && nops != hdr_arg.nops) {
996 status = process_op(nops, rqstp, &cps);
997 nops++;
998 }
999
1000 /* Buffer overflow in decode_ops_hdr or encode_ops_hdr. Return
1001 * resource error in cb_compound status without returning op */
1002 if (unlikely(status == htonl(NFS4ERR_RESOURCE_HDR))) {
1003 status = htonl(NFS4ERR_RESOURCE);
1004 nops--;
1005 }
1006
1007 if (svc_is_backchannel(rqstp) && cps.clp) {
1008 rqstp->bc_to_initval = cps.clp->cl_rpcclient->cl_timeout->to_initval;
1009 rqstp->bc_to_retries = cps.clp->cl_rpcclient->cl_timeout->to_retries;
1010 }
1011
1012 *hdr_res.status = status;
1013 *hdr_res.nops = htonl(nops);
1014 nfs4_cb_free_slot(&cps);
1015 nfs_put_client(cps.clp);
1016 return rpc_success;
1017
1018 out_invalidcred:
1019 pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n");
1020 rqstp->rq_auth_stat = rpc_autherr_badcred;
1021 return rpc_success;
1022 }
1023
1024 static int
nfs_callback_dispatch(struct svc_rqst * rqstp)1025 nfs_callback_dispatch(struct svc_rqst *rqstp)
1026 {
1027 const struct svc_procedure *procp = rqstp->rq_procinfo;
1028
1029 *rqstp->rq_accept_statp = procp->pc_func(rqstp);
1030 return 1;
1031 }
1032
1033 /*
1034 * Define NFS4 callback COMPOUND ops.
1035 */
1036 static struct callback_op callback_ops[] = {
1037 [0] = {
1038 .res_maxsize = CB_OP_HDR_RES_MAXSZ,
1039 },
1040 [OP_CB_GETATTR] = {
1041 .process_op = nfs4_callback_getattr,
1042 .decode_args = decode_getattr_args,
1043 .encode_res = encode_getattr_res,
1044 .res_maxsize = CB_OP_GETATTR_RES_MAXSZ,
1045 },
1046 [OP_CB_RECALL] = {
1047 .process_op = nfs4_callback_recall,
1048 .decode_args = decode_recall_args,
1049 .res_maxsize = CB_OP_RECALL_RES_MAXSZ,
1050 },
1051 #if defined(CONFIG_NFS_V4_1)
1052 [OP_CB_LAYOUTRECALL] = {
1053 .process_op = nfs4_callback_layoutrecall,
1054 .decode_args = decode_layoutrecall_args,
1055 .res_maxsize = CB_OP_LAYOUTRECALL_RES_MAXSZ,
1056 },
1057 [OP_CB_NOTIFY_DEVICEID] = {
1058 .process_op = nfs4_callback_devicenotify,
1059 .decode_args = decode_devicenotify_args,
1060 .res_maxsize = CB_OP_DEVICENOTIFY_RES_MAXSZ,
1061 },
1062 [OP_CB_SEQUENCE] = {
1063 .process_op = nfs4_callback_sequence,
1064 .decode_args = decode_cb_sequence_args,
1065 .encode_res = encode_cb_sequence_res,
1066 .res_maxsize = CB_OP_SEQUENCE_RES_MAXSZ,
1067 },
1068 [OP_CB_RECALL_ANY] = {
1069 .process_op = nfs4_callback_recallany,
1070 .decode_args = decode_recallany_args,
1071 .res_maxsize = CB_OP_RECALLANY_RES_MAXSZ,
1072 },
1073 [OP_CB_RECALL_SLOT] = {
1074 .process_op = nfs4_callback_recallslot,
1075 .decode_args = decode_recallslot_args,
1076 .res_maxsize = CB_OP_RECALLSLOT_RES_MAXSZ,
1077 },
1078 [OP_CB_NOTIFY_LOCK] = {
1079 .process_op = nfs4_callback_notify_lock,
1080 .decode_args = decode_notify_lock_args,
1081 .res_maxsize = CB_OP_NOTIFY_LOCK_RES_MAXSZ,
1082 },
1083 #endif /* CONFIG_NFS_V4_1 */
1084 #ifdef CONFIG_NFS_V4_2
1085 [OP_CB_OFFLOAD] = {
1086 .process_op = nfs4_callback_offload,
1087 .decode_args = decode_offload_args,
1088 .res_maxsize = CB_OP_OFFLOAD_RES_MAXSZ,
1089 },
1090 #endif /* CONFIG_NFS_V4_2 */
1091 };
1092
1093 /*
1094 * Define NFS4 callback procedures
1095 */
1096 static const struct svc_procedure nfs4_callback_procedures1[] = {
1097 [CB_NULL] = {
1098 .pc_func = nfs4_callback_null,
1099 .pc_encode = nfs4_encode_void,
1100 .pc_xdrressize = 1,
1101 .pc_name = "NULL",
1102 },
1103 [CB_COMPOUND] = {
1104 .pc_func = nfs4_callback_compound,
1105 .pc_encode = nfs4_encode_void,
1106 .pc_argsize = 256,
1107 .pc_argzero = 256,
1108 .pc_ressize = 256,
1109 .pc_xdrressize = NFS4_CALLBACK_BUFSIZE,
1110 .pc_name = "COMPOUND",
1111 }
1112 };
1113
1114 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1115 nfs4_callback_count1[ARRAY_SIZE(nfs4_callback_procedures1)]);
1116 const struct svc_version nfs4_callback_version1 = {
1117 .vs_vers = 1,
1118 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1119 .vs_proc = nfs4_callback_procedures1,
1120 .vs_count = nfs4_callback_count1,
1121 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1122 .vs_dispatch = nfs_callback_dispatch,
1123 .vs_hidden = true,
1124 .vs_need_cong_ctrl = true,
1125 };
1126
1127 static DEFINE_PER_CPU_ALIGNED(unsigned long,
1128 nfs4_callback_count4[ARRAY_SIZE(nfs4_callback_procedures1)]);
1129 const struct svc_version nfs4_callback_version4 = {
1130 .vs_vers = 4,
1131 .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
1132 .vs_proc = nfs4_callback_procedures1,
1133 .vs_count = nfs4_callback_count4,
1134 .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
1135 .vs_dispatch = nfs_callback_dispatch,
1136 .vs_hidden = true,
1137 .vs_need_cong_ctrl = true,
1138 };
1139