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Merge tag 'selinux-pr-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-focal-kernel.git] / fs / nfsd / nfs4callback.c
1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <andros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/xprt.h>
36 #include <linux/sunrpc/svc_xprt.h>
37 #include <linux/slab.h>
38 #include "nfsd.h"
39 #include "state.h"
40 #include "netns.h"
41 #include "xdr4cb.h"
42 #include "xdr4.h"
43
44 #define NFSDDBG_FACILITY NFSDDBG_PROC
45
46 static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
47
48 #define NFSPROC4_CB_NULL 0
49 #define NFSPROC4_CB_COMPOUND 1
50
51 /* Index of predefined Linux callback client operations */
52
53 struct nfs4_cb_compound_hdr {
54 /* args */
55 u32 ident; /* minorversion 0 only */
56 u32 nops;
57 __be32 *nops_p;
58 u32 minorversion;
59 /* res */
60 int status;
61 };
62
63 static __be32 *xdr_encode_empty_array(__be32 *p)
64 {
65 *p++ = xdr_zero;
66 return p;
67 }
68
69 /*
70 * Encode/decode NFSv4 CB basic data types
71 *
72 * Basic NFSv4 callback data types are defined in section 15 of RFC
73 * 3530: "Network File System (NFS) version 4 Protocol" and section
74 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
75 * 1 Protocol"
76 */
77
78 /*
79 * nfs_cb_opnum4
80 *
81 * enum nfs_cb_opnum4 {
82 * OP_CB_GETATTR = 3,
83 * ...
84 * };
85 */
86 enum nfs_cb_opnum4 {
87 OP_CB_GETATTR = 3,
88 OP_CB_RECALL = 4,
89 OP_CB_LAYOUTRECALL = 5,
90 OP_CB_NOTIFY = 6,
91 OP_CB_PUSH_DELEG = 7,
92 OP_CB_RECALL_ANY = 8,
93 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
94 OP_CB_RECALL_SLOT = 10,
95 OP_CB_SEQUENCE = 11,
96 OP_CB_WANTS_CANCELLED = 12,
97 OP_CB_NOTIFY_LOCK = 13,
98 OP_CB_NOTIFY_DEVICEID = 14,
99 OP_CB_OFFLOAD = 15,
100 OP_CB_ILLEGAL = 10044
101 };
102
103 static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
104 {
105 __be32 *p;
106
107 p = xdr_reserve_space(xdr, 4);
108 *p = cpu_to_be32(op);
109 }
110
111 /*
112 * nfs_fh4
113 *
114 * typedef opaque nfs_fh4<NFS4_FHSIZE>;
115 */
116 static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
117 {
118 u32 length = fh->fh_size;
119 __be32 *p;
120
121 BUG_ON(length > NFS4_FHSIZE);
122 p = xdr_reserve_space(xdr, 4 + length);
123 xdr_encode_opaque(p, &fh->fh_base, length);
124 }
125
126 /*
127 * stateid4
128 *
129 * struct stateid4 {
130 * uint32_t seqid;
131 * opaque other[12];
132 * };
133 */
134 static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
135 {
136 __be32 *p;
137
138 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
139 *p++ = cpu_to_be32(sid->si_generation);
140 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
141 }
142
143 /*
144 * sessionid4
145 *
146 * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
147 */
148 static void encode_sessionid4(struct xdr_stream *xdr,
149 const struct nfsd4_session *session)
150 {
151 __be32 *p;
152
153 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
154 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
155 NFS4_MAX_SESSIONID_LEN);
156 }
157
158 /*
159 * nfsstat4
160 */
161 static const struct {
162 int stat;
163 int errno;
164 } nfs_cb_errtbl[] = {
165 { NFS4_OK, 0 },
166 { NFS4ERR_PERM, -EPERM },
167 { NFS4ERR_NOENT, -ENOENT },
168 { NFS4ERR_IO, -EIO },
169 { NFS4ERR_NXIO, -ENXIO },
170 { NFS4ERR_ACCESS, -EACCES },
171 { NFS4ERR_EXIST, -EEXIST },
172 { NFS4ERR_XDEV, -EXDEV },
173 { NFS4ERR_NOTDIR, -ENOTDIR },
174 { NFS4ERR_ISDIR, -EISDIR },
175 { NFS4ERR_INVAL, -EINVAL },
176 { NFS4ERR_FBIG, -EFBIG },
177 { NFS4ERR_NOSPC, -ENOSPC },
178 { NFS4ERR_ROFS, -EROFS },
179 { NFS4ERR_MLINK, -EMLINK },
180 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
181 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
182 { NFS4ERR_DQUOT, -EDQUOT },
183 { NFS4ERR_STALE, -ESTALE },
184 { NFS4ERR_BADHANDLE, -EBADHANDLE },
185 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
186 { NFS4ERR_NOTSUPP, -ENOTSUPP },
187 { NFS4ERR_TOOSMALL, -ETOOSMALL },
188 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
189 { NFS4ERR_BADTYPE, -EBADTYPE },
190 { NFS4ERR_LOCKED, -EAGAIN },
191 { NFS4ERR_RESOURCE, -EREMOTEIO },
192 { NFS4ERR_SYMLINK, -ELOOP },
193 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
194 { NFS4ERR_DEADLOCK, -EDEADLK },
195 { -1, -EIO }
196 };
197
198 /*
199 * If we cannot translate the error, the recovery routines should
200 * handle it.
201 *
202 * Note: remaining NFSv4 error codes have values > 10000, so should
203 * not conflict with native Linux error codes.
204 */
205 static int nfs_cb_stat_to_errno(int status)
206 {
207 int i;
208
209 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
210 if (nfs_cb_errtbl[i].stat == status)
211 return nfs_cb_errtbl[i].errno;
212 }
213
214 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
215 return -status;
216 }
217
218 static int decode_cb_op_status(struct xdr_stream *xdr,
219 enum nfs_cb_opnum4 expected, int *status)
220 {
221 __be32 *p;
222 u32 op;
223
224 p = xdr_inline_decode(xdr, 4 + 4);
225 if (unlikely(p == NULL))
226 goto out_overflow;
227 op = be32_to_cpup(p++);
228 if (unlikely(op != expected))
229 goto out_unexpected;
230 *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
231 return 0;
232 out_overflow:
233 return -EIO;
234 out_unexpected:
235 dprintk("NFSD: Callback server returned operation %d but "
236 "we issued a request for %d\n", op, expected);
237 return -EIO;
238 }
239
240 /*
241 * CB_COMPOUND4args
242 *
243 * struct CB_COMPOUND4args {
244 * utf8str_cs tag;
245 * uint32_t minorversion;
246 * uint32_t callback_ident;
247 * nfs_cb_argop4 argarray<>;
248 * };
249 */
250 static void encode_cb_compound4args(struct xdr_stream *xdr,
251 struct nfs4_cb_compound_hdr *hdr)
252 {
253 __be32 * p;
254
255 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
256 p = xdr_encode_empty_array(p); /* empty tag */
257 *p++ = cpu_to_be32(hdr->minorversion);
258 *p++ = cpu_to_be32(hdr->ident);
259
260 hdr->nops_p = p;
261 *p = cpu_to_be32(hdr->nops); /* argarray element count */
262 }
263
264 /*
265 * Update argarray element count
266 */
267 static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
268 {
269 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
270 *hdr->nops_p = cpu_to_be32(hdr->nops);
271 }
272
273 /*
274 * CB_COMPOUND4res
275 *
276 * struct CB_COMPOUND4res {
277 * nfsstat4 status;
278 * utf8str_cs tag;
279 * nfs_cb_resop4 resarray<>;
280 * };
281 */
282 static int decode_cb_compound4res(struct xdr_stream *xdr,
283 struct nfs4_cb_compound_hdr *hdr)
284 {
285 u32 length;
286 __be32 *p;
287
288 p = xdr_inline_decode(xdr, 4 + 4);
289 if (unlikely(p == NULL))
290 goto out_overflow;
291 hdr->status = be32_to_cpup(p++);
292 /* Ignore the tag */
293 length = be32_to_cpup(p++);
294 p = xdr_inline_decode(xdr, length + 4);
295 if (unlikely(p == NULL))
296 goto out_overflow;
297 p += XDR_QUADLEN(length);
298 hdr->nops = be32_to_cpup(p);
299 return 0;
300 out_overflow:
301 return -EIO;
302 }
303
304 /*
305 * CB_RECALL4args
306 *
307 * struct CB_RECALL4args {
308 * stateid4 stateid;
309 * bool truncate;
310 * nfs_fh4 fh;
311 * };
312 */
313 static void encode_cb_recall4args(struct xdr_stream *xdr,
314 const struct nfs4_delegation *dp,
315 struct nfs4_cb_compound_hdr *hdr)
316 {
317 __be32 *p;
318
319 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
320 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
321
322 p = xdr_reserve_space(xdr, 4);
323 *p++ = xdr_zero; /* truncate */
324
325 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
326
327 hdr->nops++;
328 }
329
330 /*
331 * CB_SEQUENCE4args
332 *
333 * struct CB_SEQUENCE4args {
334 * sessionid4 csa_sessionid;
335 * sequenceid4 csa_sequenceid;
336 * slotid4 csa_slotid;
337 * slotid4 csa_highest_slotid;
338 * bool csa_cachethis;
339 * referring_call_list4 csa_referring_call_lists<>;
340 * };
341 */
342 static void encode_cb_sequence4args(struct xdr_stream *xdr,
343 const struct nfsd4_callback *cb,
344 struct nfs4_cb_compound_hdr *hdr)
345 {
346 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
347 __be32 *p;
348
349 if (hdr->minorversion == 0)
350 return;
351
352 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
353 encode_sessionid4(xdr, session);
354
355 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
356 *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
357 *p++ = xdr_zero; /* csa_slotid */
358 *p++ = xdr_zero; /* csa_highest_slotid */
359 *p++ = xdr_zero; /* csa_cachethis */
360 xdr_encode_empty_array(p); /* csa_referring_call_lists */
361
362 hdr->nops++;
363 }
364
365 /*
366 * CB_SEQUENCE4resok
367 *
368 * struct CB_SEQUENCE4resok {
369 * sessionid4 csr_sessionid;
370 * sequenceid4 csr_sequenceid;
371 * slotid4 csr_slotid;
372 * slotid4 csr_highest_slotid;
373 * slotid4 csr_target_highest_slotid;
374 * };
375 *
376 * union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
377 * case NFS4_OK:
378 * CB_SEQUENCE4resok csr_resok4;
379 * default:
380 * void;
381 * };
382 *
383 * Our current back channel implmentation supports a single backchannel
384 * with a single slot.
385 */
386 static int decode_cb_sequence4resok(struct xdr_stream *xdr,
387 struct nfsd4_callback *cb)
388 {
389 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
390 int status = -ESERVERFAULT;
391 __be32 *p;
392 u32 dummy;
393
394 /*
395 * If the server returns different values for sessionID, slotID or
396 * sequence number, the server is looney tunes.
397 */
398 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
399 if (unlikely(p == NULL))
400 goto out_overflow;
401
402 if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
403 dprintk("NFS: %s Invalid session id\n", __func__);
404 goto out;
405 }
406 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
407
408 dummy = be32_to_cpup(p++);
409 if (dummy != session->se_cb_seq_nr) {
410 dprintk("NFS: %s Invalid sequence number\n", __func__);
411 goto out;
412 }
413
414 dummy = be32_to_cpup(p++);
415 if (dummy != 0) {
416 dprintk("NFS: %s Invalid slotid\n", __func__);
417 goto out;
418 }
419
420 /*
421 * FIXME: process highest slotid and target highest slotid
422 */
423 status = 0;
424 out:
425 cb->cb_seq_status = status;
426 return status;
427 out_overflow:
428 status = -EIO;
429 goto out;
430 }
431
432 static int decode_cb_sequence4res(struct xdr_stream *xdr,
433 struct nfsd4_callback *cb)
434 {
435 int status;
436
437 if (cb->cb_clp->cl_minorversion == 0)
438 return 0;
439
440 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
441 if (unlikely(status || cb->cb_seq_status))
442 return status;
443
444 return decode_cb_sequence4resok(xdr, cb);
445 }
446
447 /*
448 * NFSv4.0 and NFSv4.1 XDR encode functions
449 *
450 * NFSv4.0 callback argument types are defined in section 15 of RFC
451 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
452 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
453 * Protocol".
454 */
455
456 /*
457 * NB: Without this zero space reservation, callbacks over krb5p fail
458 */
459 static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
460 const void *__unused)
461 {
462 xdr_reserve_space(xdr, 0);
463 }
464
465 /*
466 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
467 */
468 static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
469 const void *data)
470 {
471 const struct nfsd4_callback *cb = data;
472 const struct nfs4_delegation *dp = cb_to_delegation(cb);
473 struct nfs4_cb_compound_hdr hdr = {
474 .ident = cb->cb_clp->cl_cb_ident,
475 .minorversion = cb->cb_clp->cl_minorversion,
476 };
477
478 encode_cb_compound4args(xdr, &hdr);
479 encode_cb_sequence4args(xdr, cb, &hdr);
480 encode_cb_recall4args(xdr, dp, &hdr);
481 encode_cb_nops(&hdr);
482 }
483
484
485 /*
486 * NFSv4.0 and NFSv4.1 XDR decode functions
487 *
488 * NFSv4.0 callback result types are defined in section 15 of RFC
489 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
490 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
491 * Protocol".
492 */
493
494 static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
495 void *__unused)
496 {
497 return 0;
498 }
499
500 /*
501 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
502 */
503 static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
504 struct xdr_stream *xdr,
505 void *data)
506 {
507 struct nfsd4_callback *cb = data;
508 struct nfs4_cb_compound_hdr hdr;
509 int status;
510
511 status = decode_cb_compound4res(xdr, &hdr);
512 if (unlikely(status))
513 return status;
514
515 if (cb != NULL) {
516 status = decode_cb_sequence4res(xdr, cb);
517 if (unlikely(status || cb->cb_seq_status))
518 return status;
519 }
520
521 return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
522 }
523
524 #ifdef CONFIG_NFSD_PNFS
525 /*
526 * CB_LAYOUTRECALL4args
527 *
528 * struct layoutrecall_file4 {
529 * nfs_fh4 lor_fh;
530 * offset4 lor_offset;
531 * length4 lor_length;
532 * stateid4 lor_stateid;
533 * };
534 *
535 * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) {
536 * case LAYOUTRECALL4_FILE:
537 * layoutrecall_file4 lor_layout;
538 * case LAYOUTRECALL4_FSID:
539 * fsid4 lor_fsid;
540 * case LAYOUTRECALL4_ALL:
541 * void;
542 * };
543 *
544 * struct CB_LAYOUTRECALL4args {
545 * layouttype4 clora_type;
546 * layoutiomode4 clora_iomode;
547 * bool clora_changed;
548 * layoutrecall4 clora_recall;
549 * };
550 */
551 static void encode_cb_layout4args(struct xdr_stream *xdr,
552 const struct nfs4_layout_stateid *ls,
553 struct nfs4_cb_compound_hdr *hdr)
554 {
555 __be32 *p;
556
557 BUG_ON(hdr->minorversion == 0);
558
559 p = xdr_reserve_space(xdr, 5 * 4);
560 *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
561 *p++ = cpu_to_be32(ls->ls_layout_type);
562 *p++ = cpu_to_be32(IOMODE_ANY);
563 *p++ = cpu_to_be32(1);
564 *p = cpu_to_be32(RETURN_FILE);
565
566 encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
567
568 p = xdr_reserve_space(xdr, 2 * 8);
569 p = xdr_encode_hyper(p, 0);
570 xdr_encode_hyper(p, NFS4_MAX_UINT64);
571
572 encode_stateid4(xdr, &ls->ls_recall_sid);
573
574 hdr->nops++;
575 }
576
577 static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
578 struct xdr_stream *xdr,
579 const void *data)
580 {
581 const struct nfsd4_callback *cb = data;
582 const struct nfs4_layout_stateid *ls =
583 container_of(cb, struct nfs4_layout_stateid, ls_recall);
584 struct nfs4_cb_compound_hdr hdr = {
585 .ident = 0,
586 .minorversion = cb->cb_clp->cl_minorversion,
587 };
588
589 encode_cb_compound4args(xdr, &hdr);
590 encode_cb_sequence4args(xdr, cb, &hdr);
591 encode_cb_layout4args(xdr, ls, &hdr);
592 encode_cb_nops(&hdr);
593 }
594
595 static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
596 struct xdr_stream *xdr,
597 void *data)
598 {
599 struct nfsd4_callback *cb = data;
600 struct nfs4_cb_compound_hdr hdr;
601 int status;
602
603 status = decode_cb_compound4res(xdr, &hdr);
604 if (unlikely(status))
605 return status;
606
607 if (cb) {
608 status = decode_cb_sequence4res(xdr, cb);
609 if (unlikely(status || cb->cb_seq_status))
610 return status;
611 }
612 return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
613 }
614 #endif /* CONFIG_NFSD_PNFS */
615
616 static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
617 {
618 __be32 *p;
619
620 p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
621 p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
622 xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
623 }
624
625 static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
626 struct xdr_stream *xdr,
627 const void *data)
628 {
629 const struct nfsd4_callback *cb = data;
630 const struct nfsd4_blocked_lock *nbl =
631 container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
632 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
633 struct nfs4_cb_compound_hdr hdr = {
634 .ident = 0,
635 .minorversion = cb->cb_clp->cl_minorversion,
636 };
637
638 __be32 *p;
639
640 BUG_ON(hdr.minorversion == 0);
641
642 encode_cb_compound4args(xdr, &hdr);
643 encode_cb_sequence4args(xdr, cb, &hdr);
644
645 p = xdr_reserve_space(xdr, 4);
646 *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
647 encode_nfs_fh4(xdr, &nbl->nbl_fh);
648 encode_stateowner(xdr, &lo->lo_owner);
649 hdr.nops++;
650
651 encode_cb_nops(&hdr);
652 }
653
654 static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
655 struct xdr_stream *xdr,
656 void *data)
657 {
658 struct nfsd4_callback *cb = data;
659 struct nfs4_cb_compound_hdr hdr;
660 int status;
661
662 status = decode_cb_compound4res(xdr, &hdr);
663 if (unlikely(status))
664 return status;
665
666 if (cb) {
667 status = decode_cb_sequence4res(xdr, cb);
668 if (unlikely(status || cb->cb_seq_status))
669 return status;
670 }
671 return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
672 }
673
674 /*
675 * struct write_response4 {
676 * stateid4 wr_callback_id<1>;
677 * length4 wr_count;
678 * stable_how4 wr_committed;
679 * verifier4 wr_writeverf;
680 * };
681 * union offload_info4 switch (nfsstat4 coa_status) {
682 * case NFS4_OK:
683 * write_response4 coa_resok4;
684 * default:
685 * length4 coa_bytes_copied;
686 * };
687 * struct CB_OFFLOAD4args {
688 * nfs_fh4 coa_fh;
689 * stateid4 coa_stateid;
690 * offload_info4 coa_offload_info;
691 * };
692 */
693 static void encode_offload_info4(struct xdr_stream *xdr,
694 __be32 nfserr,
695 const struct nfsd4_copy *cp)
696 {
697 __be32 *p;
698
699 p = xdr_reserve_space(xdr, 4);
700 *p++ = nfserr;
701 if (!nfserr) {
702 p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
703 p = xdr_encode_empty_array(p);
704 p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
705 *p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
706 p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
707 NFS4_VERIFIER_SIZE);
708 } else {
709 p = xdr_reserve_space(xdr, 8);
710 /* We always return success if bytes were written */
711 p = xdr_encode_hyper(p, 0);
712 }
713 }
714
715 static void encode_cb_offload4args(struct xdr_stream *xdr,
716 __be32 nfserr,
717 const struct knfsd_fh *fh,
718 const struct nfsd4_copy *cp,
719 struct nfs4_cb_compound_hdr *hdr)
720 {
721 __be32 *p;
722
723 p = xdr_reserve_space(xdr, 4);
724 *p++ = cpu_to_be32(OP_CB_OFFLOAD);
725 encode_nfs_fh4(xdr, fh);
726 encode_stateid4(xdr, &cp->cp_res.cb_stateid);
727 encode_offload_info4(xdr, nfserr, cp);
728
729 hdr->nops++;
730 }
731
732 static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
733 struct xdr_stream *xdr,
734 const void *data)
735 {
736 const struct nfsd4_callback *cb = data;
737 const struct nfsd4_copy *cp =
738 container_of(cb, struct nfsd4_copy, cp_cb);
739 struct nfs4_cb_compound_hdr hdr = {
740 .ident = 0,
741 .minorversion = cb->cb_clp->cl_minorversion,
742 };
743
744 encode_cb_compound4args(xdr, &hdr);
745 encode_cb_sequence4args(xdr, cb, &hdr);
746 encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
747 encode_cb_nops(&hdr);
748 }
749
750 static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp,
751 struct xdr_stream *xdr,
752 void *data)
753 {
754 struct nfsd4_callback *cb = data;
755 struct nfs4_cb_compound_hdr hdr;
756 int status;
757
758 status = decode_cb_compound4res(xdr, &hdr);
759 if (unlikely(status))
760 return status;
761
762 if (cb) {
763 status = decode_cb_sequence4res(xdr, cb);
764 if (unlikely(status || cb->cb_seq_status))
765 return status;
766 }
767 return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status);
768 }
769 /*
770 * RPC procedure tables
771 */
772 #define PROC(proc, call, argtype, restype) \
773 [NFSPROC4_CLNT_##proc] = { \
774 .p_proc = NFSPROC4_CB_##call, \
775 .p_encode = nfs4_xdr_enc_##argtype, \
776 .p_decode = nfs4_xdr_dec_##restype, \
777 .p_arglen = NFS4_enc_##argtype##_sz, \
778 .p_replen = NFS4_dec_##restype##_sz, \
779 .p_statidx = NFSPROC4_CB_##call, \
780 .p_name = #proc, \
781 }
782
783 static const struct rpc_procinfo nfs4_cb_procedures[] = {
784 PROC(CB_NULL, NULL, cb_null, cb_null),
785 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
786 #ifdef CONFIG_NFSD_PNFS
787 PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout),
788 #endif
789 PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
790 PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
791 };
792
793 static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
794 static const struct rpc_version nfs_cb_version4 = {
795 /*
796 * Note on the callback rpc program version number: despite language in rfc
797 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
798 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
799 * in practice that appears to be what implementations use. The section
800 * 18.36.3 language is expected to be fixed in an erratum.
801 */
802 .number = 1,
803 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
804 .procs = nfs4_cb_procedures,
805 .counts = nfs4_cb_counts,
806 };
807
808 static const struct rpc_version *nfs_cb_version[2] = {
809 [1] = &nfs_cb_version4,
810 };
811
812 static const struct rpc_program cb_program;
813
814 static struct rpc_stat cb_stats = {
815 .program = &cb_program
816 };
817
818 #define NFS4_CALLBACK 0x40000000
819 static const struct rpc_program cb_program = {
820 .name = "nfs4_cb",
821 .number = NFS4_CALLBACK,
822 .nrvers = ARRAY_SIZE(nfs_cb_version),
823 .version = nfs_cb_version,
824 .stats = &cb_stats,
825 .pipe_dir_name = "nfsd4_cb",
826 };
827
828 static int max_cb_time(struct net *net)
829 {
830 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
831 return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
832 }
833
834 static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
835 {
836 if (clp->cl_minorversion == 0) {
837 client->cl_principal = clp->cl_cred.cr_targ_princ ?
838 clp->cl_cred.cr_targ_princ : "nfs";
839
840 return get_cred(rpc_machine_cred());
841 } else {
842 struct cred *kcred;
843
844 kcred = prepare_kernel_cred(NULL);
845 if (!kcred)
846 return NULL;
847
848 kcred->uid = ses->se_cb_sec.uid;
849 kcred->gid = ses->se_cb_sec.gid;
850 return kcred;
851 }
852 }
853
854 static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
855 {
856 int maxtime = max_cb_time(clp->net);
857 struct rpc_timeout timeparms = {
858 .to_initval = maxtime,
859 .to_retries = 0,
860 .to_maxval = maxtime,
861 };
862 struct rpc_create_args args = {
863 .net = clp->net,
864 .address = (struct sockaddr *) &conn->cb_addr,
865 .addrsize = conn->cb_addrlen,
866 .saddress = (struct sockaddr *) &conn->cb_saddr,
867 .timeout = &timeparms,
868 .program = &cb_program,
869 .version = 1,
870 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
871 };
872 struct rpc_clnt *client;
873 const struct cred *cred;
874
875 if (clp->cl_minorversion == 0) {
876 if (!clp->cl_cred.cr_principal &&
877 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
878 return -EINVAL;
879 args.client_name = clp->cl_cred.cr_principal;
880 args.prognumber = conn->cb_prog;
881 args.protocol = XPRT_TRANSPORT_TCP;
882 args.authflavor = clp->cl_cred.cr_flavor;
883 clp->cl_cb_ident = conn->cb_ident;
884 } else {
885 if (!conn->cb_xprt)
886 return -EINVAL;
887 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
888 clp->cl_cb_session = ses;
889 args.bc_xprt = conn->cb_xprt;
890 args.prognumber = clp->cl_cb_session->se_cb_prog;
891 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
892 XPRT_TRANSPORT_BC;
893 args.authflavor = ses->se_cb_sec.flavor;
894 }
895 /* Create RPC client */
896 client = rpc_create(&args);
897 if (IS_ERR(client)) {
898 dprintk("NFSD: couldn't create callback client: %ld\n",
899 PTR_ERR(client));
900 return PTR_ERR(client);
901 }
902 cred = get_backchannel_cred(clp, client, ses);
903 if (!cred) {
904 rpc_shutdown_client(client);
905 return -ENOMEM;
906 }
907 clp->cl_cb_client = client;
908 clp->cl_cb_cred = cred;
909 return 0;
910 }
911
912 static void warn_no_callback_path(struct nfs4_client *clp, int reason)
913 {
914 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
915 (int)clp->cl_name.len, clp->cl_name.data, reason);
916 }
917
918 static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
919 {
920 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
921 return;
922 clp->cl_cb_state = NFSD4_CB_DOWN;
923 warn_no_callback_path(clp, reason);
924 }
925
926 static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
927 {
928 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
929 return;
930 clp->cl_cb_state = NFSD4_CB_FAULT;
931 warn_no_callback_path(clp, reason);
932 }
933
934 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
935 {
936 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
937
938 if (task->tk_status)
939 nfsd4_mark_cb_down(clp, task->tk_status);
940 else
941 clp->cl_cb_state = NFSD4_CB_UP;
942 }
943
944 static const struct rpc_call_ops nfsd4_cb_probe_ops = {
945 /* XXX: release method to ensure we set the cb channel down if
946 * necessary on early failure? */
947 .rpc_call_done = nfsd4_cb_probe_done,
948 };
949
950 static struct workqueue_struct *callback_wq;
951
952 /*
953 * Poke the callback thread to process any updates to the callback
954 * parameters, and send a null probe.
955 */
956 void nfsd4_probe_callback(struct nfs4_client *clp)
957 {
958 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
959 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
960 nfsd4_run_cb(&clp->cl_cb_null);
961 }
962
963 void nfsd4_probe_callback_sync(struct nfs4_client *clp)
964 {
965 nfsd4_probe_callback(clp);
966 flush_workqueue(callback_wq);
967 }
968
969 void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
970 {
971 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
972 spin_lock(&clp->cl_lock);
973 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
974 spin_unlock(&clp->cl_lock);
975 }
976
977 /*
978 * There's currently a single callback channel slot.
979 * If the slot is available, then mark it busy. Otherwise, set the
980 * thread for sleeping on the callback RPC wait queue.
981 */
982 static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
983 {
984 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
985 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
986 /* Race breaker */
987 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
988 dprintk("%s slot is busy\n", __func__);
989 return false;
990 }
991 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
992 }
993 return true;
994 }
995
996 /*
997 * TODO: cb_sequence should support referring call lists, cachethis, multiple
998 * slots, and mark callback channel down on communication errors.
999 */
1000 static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
1001 {
1002 struct nfsd4_callback *cb = calldata;
1003 struct nfs4_client *clp = cb->cb_clp;
1004 u32 minorversion = clp->cl_minorversion;
1005
1006 /*
1007 * cb_seq_status is only set in decode_cb_sequence4res,
1008 * and so will remain 1 if an rpc level failure occurs.
1009 */
1010 cb->cb_seq_status = 1;
1011 cb->cb_status = 0;
1012 if (minorversion) {
1013 if (!cb->cb_holds_slot && !nfsd41_cb_get_slot(clp, task))
1014 return;
1015 cb->cb_holds_slot = true;
1016 }
1017 rpc_call_start(task);
1018 }
1019
1020 static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
1021 {
1022 struct nfs4_client *clp = cb->cb_clp;
1023 struct nfsd4_session *session = clp->cl_cb_session;
1024 bool ret = true;
1025
1026 if (!clp->cl_minorversion) {
1027 /*
1028 * If the backchannel connection was shut down while this
1029 * task was queued, we need to resubmit it after setting up
1030 * a new backchannel connection.
1031 *
1032 * Note that if we lost our callback connection permanently
1033 * the submission code will error out, so we don't need to
1034 * handle that case here.
1035 */
1036 if (task->tk_flags & RPC_TASK_KILLED)
1037 goto need_restart;
1038
1039 return true;
1040 }
1041
1042 if (!cb->cb_holds_slot)
1043 goto need_restart;
1044
1045 switch (cb->cb_seq_status) {
1046 case 0:
1047 /*
1048 * No need for lock, access serialized in nfsd4_cb_prepare
1049 *
1050 * RFC5661 20.9.3
1051 * If CB_SEQUENCE returns an error, then the state of the slot
1052 * (sequence ID, cached reply) MUST NOT change.
1053 */
1054 ++session->se_cb_seq_nr;
1055 break;
1056 case -ESERVERFAULT:
1057 ++session->se_cb_seq_nr;
1058 /* Fall through */
1059 case 1:
1060 case -NFS4ERR_BADSESSION:
1061 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
1062 ret = false;
1063 break;
1064 case -NFS4ERR_DELAY:
1065 if (!rpc_restart_call(task))
1066 goto out;
1067
1068 rpc_delay(task, 2 * HZ);
1069 return false;
1070 case -NFS4ERR_BADSLOT:
1071 goto retry_nowait;
1072 case -NFS4ERR_SEQ_MISORDERED:
1073 if (session->se_cb_seq_nr != 1) {
1074 session->se_cb_seq_nr = 1;
1075 goto retry_nowait;
1076 }
1077 break;
1078 default:
1079 dprintk("%s: unprocessed error %d\n", __func__,
1080 cb->cb_seq_status);
1081 }
1082
1083 cb->cb_holds_slot = false;
1084 clear_bit(0, &clp->cl_cb_slot_busy);
1085 rpc_wake_up_next(&clp->cl_cb_waitq);
1086 dprintk("%s: freed slot, new seqid=%d\n", __func__,
1087 clp->cl_cb_session->se_cb_seq_nr);
1088
1089 if (task->tk_flags & RPC_TASK_KILLED)
1090 goto need_restart;
1091 out:
1092 return ret;
1093 retry_nowait:
1094 if (rpc_restart_call_prepare(task))
1095 ret = false;
1096 goto out;
1097 need_restart:
1098 task->tk_status = 0;
1099 cb->cb_need_restart = true;
1100 return false;
1101 }
1102
1103 static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
1104 {
1105 struct nfsd4_callback *cb = calldata;
1106 struct nfs4_client *clp = cb->cb_clp;
1107
1108 dprintk("%s: minorversion=%d\n", __func__,
1109 clp->cl_minorversion);
1110
1111 if (!nfsd4_cb_sequence_done(task, cb))
1112 return;
1113
1114 if (cb->cb_status) {
1115 WARN_ON_ONCE(task->tk_status);
1116 task->tk_status = cb->cb_status;
1117 }
1118
1119 switch (cb->cb_ops->done(cb, task)) {
1120 case 0:
1121 task->tk_status = 0;
1122 rpc_restart_call_prepare(task);
1123 return;
1124 case 1:
1125 break;
1126 case -1:
1127 /* Network partition? */
1128 nfsd4_mark_cb_down(clp, task->tk_status);
1129 break;
1130 default:
1131 BUG();
1132 }
1133 }
1134
1135 static void nfsd4_cb_release(void *calldata)
1136 {
1137 struct nfsd4_callback *cb = calldata;
1138
1139 if (cb->cb_need_restart)
1140 nfsd4_run_cb(cb);
1141 else
1142 cb->cb_ops->release(cb);
1143
1144 }
1145
1146 static const struct rpc_call_ops nfsd4_cb_ops = {
1147 .rpc_call_prepare = nfsd4_cb_prepare,
1148 .rpc_call_done = nfsd4_cb_done,
1149 .rpc_release = nfsd4_cb_release,
1150 };
1151
1152 int nfsd4_create_callback_queue(void)
1153 {
1154 callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
1155 if (!callback_wq)
1156 return -ENOMEM;
1157 return 0;
1158 }
1159
1160 void nfsd4_destroy_callback_queue(void)
1161 {
1162 destroy_workqueue(callback_wq);
1163 }
1164
1165 /* must be called under the state lock */
1166 void nfsd4_shutdown_callback(struct nfs4_client *clp)
1167 {
1168 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
1169 /*
1170 * Note this won't actually result in a null callback;
1171 * instead, nfsd4_run_cb_null() will detect the killed
1172 * client, destroy the rpc client, and stop:
1173 */
1174 nfsd4_run_cb(&clp->cl_cb_null);
1175 flush_workqueue(callback_wq);
1176 }
1177
1178 /* requires cl_lock: */
1179 static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
1180 {
1181 struct nfsd4_session *s;
1182 struct nfsd4_conn *c;
1183
1184 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
1185 list_for_each_entry(c, &s->se_conns, cn_persession) {
1186 if (c->cn_flags & NFS4_CDFC4_BACK)
1187 return c;
1188 }
1189 }
1190 return NULL;
1191 }
1192
1193 static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
1194 {
1195 struct nfs4_cb_conn conn;
1196 struct nfs4_client *clp = cb->cb_clp;
1197 struct nfsd4_session *ses = NULL;
1198 struct nfsd4_conn *c;
1199 int err;
1200
1201 /*
1202 * This is either an update, or the client dying; in either case,
1203 * kill the old client:
1204 */
1205 if (clp->cl_cb_client) {
1206 rpc_shutdown_client(clp->cl_cb_client);
1207 clp->cl_cb_client = NULL;
1208 put_cred(clp->cl_cb_cred);
1209 clp->cl_cb_cred = NULL;
1210 }
1211 if (clp->cl_cb_conn.cb_xprt) {
1212 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1213 clp->cl_cb_conn.cb_xprt = NULL;
1214 }
1215 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
1216 return;
1217 spin_lock(&clp->cl_lock);
1218 /*
1219 * Only serialized callback code is allowed to clear these
1220 * flags; main nfsd code can only set them:
1221 */
1222 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
1223 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
1224 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
1225 c = __nfsd4_find_backchannel(clp);
1226 if (c) {
1227 svc_xprt_get(c->cn_xprt);
1228 conn.cb_xprt = c->cn_xprt;
1229 ses = c->cn_session;
1230 }
1231 spin_unlock(&clp->cl_lock);
1232
1233 err = setup_callback_client(clp, &conn, ses);
1234 if (err) {
1235 nfsd4_mark_cb_down(clp, err);
1236 return;
1237 }
1238 }
1239
1240 static void
1241 nfsd4_run_cb_work(struct work_struct *work)
1242 {
1243 struct nfsd4_callback *cb =
1244 container_of(work, struct nfsd4_callback, cb_work);
1245 struct nfs4_client *clp = cb->cb_clp;
1246 struct rpc_clnt *clnt;
1247
1248 if (cb->cb_need_restart) {
1249 cb->cb_need_restart = false;
1250 } else {
1251 if (cb->cb_ops && cb->cb_ops->prepare)
1252 cb->cb_ops->prepare(cb);
1253 }
1254
1255 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
1256 nfsd4_process_cb_update(cb);
1257
1258 clnt = clp->cl_cb_client;
1259 if (!clnt) {
1260 /* Callback channel broken, or client killed; give up: */
1261 if (cb->cb_ops && cb->cb_ops->release)
1262 cb->cb_ops->release(cb);
1263 return;
1264 }
1265
1266 /*
1267 * Don't send probe messages for 4.1 or later.
1268 */
1269 if (!cb->cb_ops && clp->cl_minorversion) {
1270 clp->cl_cb_state = NFSD4_CB_UP;
1271 return;
1272 }
1273
1274 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
1275 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
1276 cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
1277 }
1278
1279 void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
1280 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
1281 {
1282 cb->cb_clp = clp;
1283 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
1284 cb->cb_msg.rpc_argp = cb;
1285 cb->cb_msg.rpc_resp = cb;
1286 cb->cb_ops = ops;
1287 INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
1288 cb->cb_seq_status = 1;
1289 cb->cb_status = 0;
1290 cb->cb_need_restart = false;
1291 cb->cb_holds_slot = false;
1292 }
1293
1294 void nfsd4_run_cb(struct nfsd4_callback *cb)
1295 {
1296 queue_work(callback_wq, &cb->cb_work);
1297 }
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