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Linux/fs/nfsd/nfs4callback.c

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  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 
 43 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 44 
 45 static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
 46 
 47 #define NFSPROC4_CB_NULL 0
 48 #define NFSPROC4_CB_COMPOUND 1
 49 
 50 /* Index of predefined Linux callback client operations */
 51 
 52 struct nfs4_cb_compound_hdr {
 53         /* args */
 54         u32             ident;  /* minorversion 0 only */
 55         u32             nops;
 56         __be32          *nops_p;
 57         u32             minorversion;
 58         /* res */
 59         int             status;
 60 };
 61 
 62 /*
 63  * Handle decode buffer overflows out-of-line.
 64  */
 65 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
 66 {
 67         dprintk("NFS: %s prematurely hit the end of our receive buffer. "
 68                 "Remaining buffer length is %tu words.\n",
 69                 func, xdr->end - xdr->p);
 70 }
 71 
 72 static __be32 *xdr_encode_empty_array(__be32 *p)
 73 {
 74         *p++ = xdr_zero;
 75         return p;
 76 }
 77 
 78 /*
 79  * Encode/decode NFSv4 CB basic data types
 80  *
 81  * Basic NFSv4 callback data types are defined in section 15 of RFC
 82  * 3530: "Network File System (NFS) version 4 Protocol" and section
 83  * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
 84  * 1 Protocol"
 85  */
 86 
 87 /*
 88  *      nfs_cb_opnum4
 89  *
 90  *      enum nfs_cb_opnum4 {
 91  *              OP_CB_GETATTR           = 3,
 92  *                ...
 93  *      };
 94  */
 95 enum nfs_cb_opnum4 {
 96         OP_CB_GETATTR                   = 3,
 97         OP_CB_RECALL                    = 4,
 98         OP_CB_LAYOUTRECALL              = 5,
 99         OP_CB_NOTIFY                    = 6,
100         OP_CB_PUSH_DELEG                = 7,
101         OP_CB_RECALL_ANY                = 8,
102         OP_CB_RECALLABLE_OBJ_AVAIL      = 9,
103         OP_CB_RECALL_SLOT               = 10,
104         OP_CB_SEQUENCE                  = 11,
105         OP_CB_WANTS_CANCELLED           = 12,
106         OP_CB_NOTIFY_LOCK               = 13,
107         OP_CB_NOTIFY_DEVICEID           = 14,
108         OP_CB_ILLEGAL                   = 10044
109 };
110 
111 static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
112 {
113         __be32 *p;
114 
115         p = xdr_reserve_space(xdr, 4);
116         *p = cpu_to_be32(op);
117 }
118 
119 /*
120  * nfs_fh4
121  *
122  *      typedef opaque nfs_fh4<NFS4_FHSIZE>;
123  */
124 static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
125 {
126         u32 length = fh->fh_size;
127         __be32 *p;
128 
129         BUG_ON(length > NFS4_FHSIZE);
130         p = xdr_reserve_space(xdr, 4 + length);
131         xdr_encode_opaque(p, &fh->fh_base, length);
132 }
133 
134 /*
135  * stateid4
136  *
137  *      struct stateid4 {
138  *              uint32_t        seqid;
139  *              opaque          other[12];
140  *      };
141  */
142 static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
143 {
144         __be32 *p;
145 
146         p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
147         *p++ = cpu_to_be32(sid->si_generation);
148         xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
149 }
150 
151 /*
152  * sessionid4
153  *
154  *      typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
155  */
156 static void encode_sessionid4(struct xdr_stream *xdr,
157                               const struct nfsd4_session *session)
158 {
159         __be32 *p;
160 
161         p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
162         xdr_encode_opaque_fixed(p, session->se_sessionid.data,
163                                         NFS4_MAX_SESSIONID_LEN);
164 }
165 
166 /*
167  * nfsstat4
168  */
169 static const struct {
170         int stat;
171         int errno;
172 } nfs_cb_errtbl[] = {
173         { NFS4_OK,              0               },
174         { NFS4ERR_PERM,         -EPERM          },
175         { NFS4ERR_NOENT,        -ENOENT         },
176         { NFS4ERR_IO,           -EIO            },
177         { NFS4ERR_NXIO,         -ENXIO          },
178         { NFS4ERR_ACCESS,       -EACCES         },
179         { NFS4ERR_EXIST,        -EEXIST         },
180         { NFS4ERR_XDEV,         -EXDEV          },
181         { NFS4ERR_NOTDIR,       -ENOTDIR        },
182         { NFS4ERR_ISDIR,        -EISDIR         },
183         { NFS4ERR_INVAL,        -EINVAL         },
184         { NFS4ERR_FBIG,         -EFBIG          },
185         { NFS4ERR_NOSPC,        -ENOSPC         },
186         { NFS4ERR_ROFS,         -EROFS          },
187         { NFS4ERR_MLINK,        -EMLINK         },
188         { NFS4ERR_NAMETOOLONG,  -ENAMETOOLONG   },
189         { NFS4ERR_NOTEMPTY,     -ENOTEMPTY      },
190         { NFS4ERR_DQUOT,        -EDQUOT         },
191         { NFS4ERR_STALE,        -ESTALE         },
192         { NFS4ERR_BADHANDLE,    -EBADHANDLE     },
193         { NFS4ERR_BAD_COOKIE,   -EBADCOOKIE     },
194         { NFS4ERR_NOTSUPP,      -ENOTSUPP       },
195         { NFS4ERR_TOOSMALL,     -ETOOSMALL      },
196         { NFS4ERR_SERVERFAULT,  -ESERVERFAULT   },
197         { NFS4ERR_BADTYPE,      -EBADTYPE       },
198         { NFS4ERR_LOCKED,       -EAGAIN         },
199         { NFS4ERR_RESOURCE,     -EREMOTEIO      },
200         { NFS4ERR_SYMLINK,      -ELOOP          },
201         { NFS4ERR_OP_ILLEGAL,   -EOPNOTSUPP     },
202         { NFS4ERR_DEADLOCK,     -EDEADLK        },
203         { -1,                   -EIO            }
204 };
205 
206 /*
207  * If we cannot translate the error, the recovery routines should
208  * handle it.
209  *
210  * Note: remaining NFSv4 error codes have values > 10000, so should
211  * not conflict with native Linux error codes.
212  */
213 static int nfs_cb_stat_to_errno(int status)
214 {
215         int i;
216 
217         for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
218                 if (nfs_cb_errtbl[i].stat == status)
219                         return nfs_cb_errtbl[i].errno;
220         }
221 
222         dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
223         return -status;
224 }
225 
226 static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
227                                int *status)
228 {
229         __be32 *p;
230         u32 op;
231 
232         p = xdr_inline_decode(xdr, 4 + 4);
233         if (unlikely(p == NULL))
234                 goto out_overflow;
235         op = be32_to_cpup(p++);
236         if (unlikely(op != expected))
237                 goto out_unexpected;
238         *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
239         return 0;
240 out_overflow:
241         print_overflow_msg(__func__, xdr);
242         return -EIO;
243 out_unexpected:
244         dprintk("NFSD: Callback server returned operation %d but "
245                 "we issued a request for %d\n", op, expected);
246         return -EIO;
247 }
248 
249 /*
250  * CB_COMPOUND4args
251  *
252  *      struct CB_COMPOUND4args {
253  *              utf8str_cs      tag;
254  *              uint32_t        minorversion;
255  *              uint32_t        callback_ident;
256  *              nfs_cb_argop4   argarray<>;
257  *      };
258 */
259 static void encode_cb_compound4args(struct xdr_stream *xdr,
260                                     struct nfs4_cb_compound_hdr *hdr)
261 {
262         __be32 * p;
263 
264         p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
265         p = xdr_encode_empty_array(p);          /* empty tag */
266         *p++ = cpu_to_be32(hdr->minorversion);
267         *p++ = cpu_to_be32(hdr->ident);
268 
269         hdr->nops_p = p;
270         *p = cpu_to_be32(hdr->nops);            /* argarray element count */
271 }
272 
273 /*
274  * Update argarray element count
275  */
276 static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
277 {
278         BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
279         *hdr->nops_p = cpu_to_be32(hdr->nops);
280 }
281 
282 /*
283  * CB_COMPOUND4res
284  *
285  *      struct CB_COMPOUND4res {
286  *              nfsstat4        status;
287  *              utf8str_cs      tag;
288  *              nfs_cb_resop4   resarray<>;
289  *      };
290  */
291 static int decode_cb_compound4res(struct xdr_stream *xdr,
292                                   struct nfs4_cb_compound_hdr *hdr)
293 {
294         u32 length;
295         __be32 *p;
296 
297         p = xdr_inline_decode(xdr, 4 + 4);
298         if (unlikely(p == NULL))
299                 goto out_overflow;
300         hdr->status = be32_to_cpup(p++);
301         /* Ignore the tag */
302         length = be32_to_cpup(p++);
303         p = xdr_inline_decode(xdr, length + 4);
304         if (unlikely(p == NULL))
305                 goto out_overflow;
306         p += XDR_QUADLEN(length);
307         hdr->nops = be32_to_cpup(p);
308         return 0;
309 out_overflow:
310         print_overflow_msg(__func__, xdr);
311         return -EIO;
312 }
313 
314 /*
315  * CB_RECALL4args
316  *
317  *      struct CB_RECALL4args {
318  *              stateid4        stateid;
319  *              bool            truncate;
320  *              nfs_fh4         fh;
321  *      };
322  */
323 static void encode_cb_recall4args(struct xdr_stream *xdr,
324                                   const struct nfs4_delegation *dp,
325                                   struct nfs4_cb_compound_hdr *hdr)
326 {
327         __be32 *p;
328 
329         encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
330         encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
331 
332         p = xdr_reserve_space(xdr, 4);
333         *p++ = xdr_zero;                        /* truncate */
334 
335         encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
336 
337         hdr->nops++;
338 }
339 
340 /*
341  * CB_SEQUENCE4args
342  *
343  *      struct CB_SEQUENCE4args {
344  *              sessionid4              csa_sessionid;
345  *              sequenceid4             csa_sequenceid;
346  *              slotid4                 csa_slotid;
347  *              slotid4                 csa_highest_slotid;
348  *              bool                    csa_cachethis;
349  *              referring_call_list4    csa_referring_call_lists<>;
350  *      };
351  */
352 static void encode_cb_sequence4args(struct xdr_stream *xdr,
353                                     const struct nfsd4_callback *cb,
354                                     struct nfs4_cb_compound_hdr *hdr)
355 {
356         struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
357         __be32 *p;
358 
359         if (hdr->minorversion == 0)
360                 return;
361 
362         encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
363         encode_sessionid4(xdr, session);
364 
365         p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
366         *p++ = cpu_to_be32(session->se_cb_seq_nr);      /* csa_sequenceid */
367         *p++ = xdr_zero;                        /* csa_slotid */
368         *p++ = xdr_zero;                        /* csa_highest_slotid */
369         *p++ = xdr_zero;                        /* csa_cachethis */
370         xdr_encode_empty_array(p);              /* csa_referring_call_lists */
371 
372         hdr->nops++;
373 }
374 
375 /*
376  * CB_SEQUENCE4resok
377  *
378  *      struct CB_SEQUENCE4resok {
379  *              sessionid4      csr_sessionid;
380  *              sequenceid4     csr_sequenceid;
381  *              slotid4         csr_slotid;
382  *              slotid4         csr_highest_slotid;
383  *              slotid4         csr_target_highest_slotid;
384  *      };
385  *
386  *      union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
387  *      case NFS4_OK:
388  *              CB_SEQUENCE4resok       csr_resok4;
389  *      default:
390  *              void;
391  *      };
392  *
393  * Our current back channel implmentation supports a single backchannel
394  * with a single slot.
395  */
396 static int decode_cb_sequence4resok(struct xdr_stream *xdr,
397                                     struct nfsd4_callback *cb)
398 {
399         struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
400         int status = -ESERVERFAULT;
401         __be32 *p;
402         u32 dummy;
403 
404         /*
405          * If the server returns different values for sessionID, slotID or
406          * sequence number, the server is looney tunes.
407          */
408         p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
409         if (unlikely(p == NULL))
410                 goto out_overflow;
411 
412         if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
413                 dprintk("NFS: %s Invalid session id\n", __func__);
414                 goto out;
415         }
416         p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
417 
418         dummy = be32_to_cpup(p++);
419         if (dummy != session->se_cb_seq_nr) {
420                 dprintk("NFS: %s Invalid sequence number\n", __func__);
421                 goto out;
422         }
423 
424         dummy = be32_to_cpup(p++);
425         if (dummy != 0) {
426                 dprintk("NFS: %s Invalid slotid\n", __func__);
427                 goto out;
428         }
429 
430         /*
431          * FIXME: process highest slotid and target highest slotid
432          */
433         status = 0;
434 out:
435         cb->cb_seq_status = status;
436         return status;
437 out_overflow:
438         print_overflow_msg(__func__, xdr);
439         status = -EIO;
440         goto out;
441 }
442 
443 static int decode_cb_sequence4res(struct xdr_stream *xdr,
444                                   struct nfsd4_callback *cb)
445 {
446         int status;
447 
448         if (cb->cb_clp->cl_minorversion == 0)
449                 return 0;
450 
451         status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
452         if (unlikely(status || cb->cb_seq_status))
453                 return status;
454 
455         return decode_cb_sequence4resok(xdr, cb);
456 }
457 
458 /*
459  * NFSv4.0 and NFSv4.1 XDR encode functions
460  *
461  * NFSv4.0 callback argument types are defined in section 15 of RFC
462  * 3530: "Network File System (NFS) version 4 Protocol" and section 20
463  * of RFC 5661:  "Network File System (NFS) Version 4 Minor Version 1
464  * Protocol".
465  */
466 
467 /*
468  * NB: Without this zero space reservation, callbacks over krb5p fail
469  */
470 static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
471                                  const void *__unused)
472 {
473         xdr_reserve_space(xdr, 0);
474 }
475 
476 /*
477  * 20.2. Operation 4: CB_RECALL - Recall a Delegation
478  */
479 static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
480                                    const void *data)
481 {
482         const struct nfsd4_callback *cb = data;
483         const struct nfs4_delegation *dp = cb_to_delegation(cb);
484         struct nfs4_cb_compound_hdr hdr = {
485                 .ident = cb->cb_clp->cl_cb_ident,
486                 .minorversion = cb->cb_clp->cl_minorversion,
487         };
488 
489         encode_cb_compound4args(xdr, &hdr);
490         encode_cb_sequence4args(xdr, cb, &hdr);
491         encode_cb_recall4args(xdr, dp, &hdr);
492         encode_cb_nops(&hdr);
493 }
494 
495 
496 /*
497  * NFSv4.0 and NFSv4.1 XDR decode functions
498  *
499  * NFSv4.0 callback result types are defined in section 15 of RFC
500  * 3530: "Network File System (NFS) version 4 Protocol" and section 20
501  * of RFC 5661:  "Network File System (NFS) Version 4 Minor Version 1
502  * Protocol".
503  */
504 
505 static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
506                                 void *__unused)
507 {
508         return 0;
509 }
510 
511 /*
512  * 20.2. Operation 4: CB_RECALL - Recall a Delegation
513  */
514 static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
515                                   struct xdr_stream *xdr,
516                                   void *data)
517 {
518         struct nfsd4_callback *cb = data;
519         struct nfs4_cb_compound_hdr hdr;
520         int status;
521 
522         status = decode_cb_compound4res(xdr, &hdr);
523         if (unlikely(status))
524                 return status;
525 
526         if (cb != NULL) {
527                 status = decode_cb_sequence4res(xdr, cb);
528                 if (unlikely(status || cb->cb_seq_status))
529                         return status;
530         }
531 
532         return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
533 }
534 
535 #ifdef CONFIG_NFSD_PNFS
536 /*
537  * CB_LAYOUTRECALL4args
538  *
539  *      struct layoutrecall_file4 {
540  *              nfs_fh4         lor_fh;
541  *              offset4         lor_offset;
542  *              length4         lor_length;
543  *              stateid4        lor_stateid;
544  *      };
545  *
546  *      union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) {
547  *      case LAYOUTRECALL4_FILE:
548  *              layoutrecall_file4 lor_layout;
549  *      case LAYOUTRECALL4_FSID:
550  *              fsid4              lor_fsid;
551  *      case LAYOUTRECALL4_ALL:
552  *              void;
553  *      };
554  *
555  *      struct CB_LAYOUTRECALL4args {
556  *              layouttype4             clora_type;
557  *              layoutiomode4           clora_iomode;
558  *              bool                    clora_changed;
559  *              layoutrecall4           clora_recall;
560  *      };
561  */
562 static void encode_cb_layout4args(struct xdr_stream *xdr,
563                                   const struct nfs4_layout_stateid *ls,
564                                   struct nfs4_cb_compound_hdr *hdr)
565 {
566         __be32 *p;
567 
568         BUG_ON(hdr->minorversion == 0);
569 
570         p = xdr_reserve_space(xdr, 5 * 4);
571         *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
572         *p++ = cpu_to_be32(ls->ls_layout_type);
573         *p++ = cpu_to_be32(IOMODE_ANY);
574         *p++ = cpu_to_be32(1);
575         *p = cpu_to_be32(RETURN_FILE);
576 
577         encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
578 
579         p = xdr_reserve_space(xdr, 2 * 8);
580         p = xdr_encode_hyper(p, 0);
581         xdr_encode_hyper(p, NFS4_MAX_UINT64);
582 
583         encode_stateid4(xdr, &ls->ls_recall_sid);
584 
585         hdr->nops++;
586 }
587 
588 static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
589                                    struct xdr_stream *xdr,
590                                    const void *data)
591 {
592         const struct nfsd4_callback *cb = data;
593         const struct nfs4_layout_stateid *ls =
594                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
595         struct nfs4_cb_compound_hdr hdr = {
596                 .ident = 0,
597                 .minorversion = cb->cb_clp->cl_minorversion,
598         };
599 
600         encode_cb_compound4args(xdr, &hdr);
601         encode_cb_sequence4args(xdr, cb, &hdr);
602         encode_cb_layout4args(xdr, ls, &hdr);
603         encode_cb_nops(&hdr);
604 }
605 
606 static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
607                                   struct xdr_stream *xdr,
608                                   void *data)
609 {
610         struct nfsd4_callback *cb = data;
611         struct nfs4_cb_compound_hdr hdr;
612         int status;
613 
614         status = decode_cb_compound4res(xdr, &hdr);
615         if (unlikely(status))
616                 return status;
617 
618         if (cb) {
619                 status = decode_cb_sequence4res(xdr, cb);
620                 if (unlikely(status || cb->cb_seq_status))
621                         return status;
622         }
623         return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
624 }
625 #endif /* CONFIG_NFSD_PNFS */
626 
627 static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
628 {
629         __be32  *p;
630 
631         p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
632         p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
633         xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
634 }
635 
636 static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
637                                         struct xdr_stream *xdr,
638                                         const void *data)
639 {
640         const struct nfsd4_callback *cb = data;
641         const struct nfsd4_blocked_lock *nbl =
642                 container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
643         struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
644         struct nfs4_cb_compound_hdr hdr = {
645                 .ident = 0,
646                 .minorversion = cb->cb_clp->cl_minorversion,
647         };
648 
649         __be32 *p;
650 
651         BUG_ON(hdr.minorversion == 0);
652 
653         encode_cb_compound4args(xdr, &hdr);
654         encode_cb_sequence4args(xdr, cb, &hdr);
655 
656         p = xdr_reserve_space(xdr, 4);
657         *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
658         encode_nfs_fh4(xdr, &nbl->nbl_fh);
659         encode_stateowner(xdr, &lo->lo_owner);
660         hdr.nops++;
661 
662         encode_cb_nops(&hdr);
663 }
664 
665 static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
666                                         struct xdr_stream *xdr,
667                                         void *data)
668 {
669         struct nfsd4_callback *cb = data;
670         struct nfs4_cb_compound_hdr hdr;
671         int status;
672 
673         status = decode_cb_compound4res(xdr, &hdr);
674         if (unlikely(status))
675                 return status;
676 
677         if (cb) {
678                 status = decode_cb_sequence4res(xdr, cb);
679                 if (unlikely(status || cb->cb_seq_status))
680                         return status;
681         }
682         return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
683 }
684 
685 /*
686  * RPC procedure tables
687  */
688 #define PROC(proc, call, argtype, restype)                              \
689 [NFSPROC4_CLNT_##proc] = {                                              \
690         .p_proc    = NFSPROC4_CB_##call,                                \
691         .p_encode  = nfs4_xdr_enc_##argtype,            \
692         .p_decode  = nfs4_xdr_dec_##restype,                            \
693         .p_arglen  = NFS4_enc_##argtype##_sz,                           \
694         .p_replen  = NFS4_dec_##restype##_sz,                           \
695         .p_statidx = NFSPROC4_CB_##call,                                \
696         .p_name    = #proc,                                             \
697 }
698 
699 static const struct rpc_procinfo nfs4_cb_procedures[] = {
700         PROC(CB_NULL,   NULL,           cb_null,        cb_null),
701         PROC(CB_RECALL, COMPOUND,       cb_recall,      cb_recall),
702 #ifdef CONFIG_NFSD_PNFS
703         PROC(CB_LAYOUT, COMPOUND,       cb_layout,      cb_layout),
704 #endif
705         PROC(CB_NOTIFY_LOCK,    COMPOUND,       cb_notify_lock, cb_notify_lock),
706 };
707 
708 static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
709 static const struct rpc_version nfs_cb_version4 = {
710 /*
711  * Note on the callback rpc program version number: despite language in rfc
712  * 5661 section 18.36.3 requiring servers to use 4 in this field, the
713  * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
714  * in practice that appears to be what implementations use.  The section
715  * 18.36.3 language is expected to be fixed in an erratum.
716  */
717         .number                 = 1,
718         .nrprocs                = ARRAY_SIZE(nfs4_cb_procedures),
719         .procs                  = nfs4_cb_procedures,
720         .counts                 = nfs4_cb_counts,
721 };
722 
723 static const struct rpc_version *nfs_cb_version[2] = {
724         [1] = &nfs_cb_version4,
725 };
726 
727 static const struct rpc_program cb_program;
728 
729 static struct rpc_stat cb_stats = {
730         .program                = &cb_program
731 };
732 
733 #define NFS4_CALLBACK 0x40000000
734 static const struct rpc_program cb_program = {
735         .name                   = "nfs4_cb",
736         .number                 = NFS4_CALLBACK,
737         .nrvers                 = ARRAY_SIZE(nfs_cb_version),
738         .version                = nfs_cb_version,
739         .stats                  = &cb_stats,
740         .pipe_dir_name          = "nfsd4_cb",
741 };
742 
743 static int max_cb_time(struct net *net)
744 {
745         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
746         return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
747 }
748 
749 static struct rpc_cred *callback_cred;
750 
751 int set_callback_cred(void)
752 {
753         if (callback_cred)
754                 return 0;
755         callback_cred = rpc_lookup_machine_cred("nfs");
756         if (!callback_cred)
757                 return -ENOMEM;
758         return 0;
759 }
760 
761 void cleanup_callback_cred(void)
762 {
763         if (callback_cred) {
764                 put_rpccred(callback_cred);
765                 callback_cred = NULL;
766         }
767 }
768 
769 static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
770 {
771         if (clp->cl_minorversion == 0) {
772                 return get_rpccred(callback_cred);
773         } else {
774                 struct rpc_auth *auth = client->cl_auth;
775                 struct auth_cred acred = {};
776 
777                 acred.uid = ses->se_cb_sec.uid;
778                 acred.gid = ses->se_cb_sec.gid;
779                 return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
780         }
781 }
782 
783 static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
784 {
785         int maxtime = max_cb_time(clp->net);
786         struct rpc_timeout      timeparms = {
787                 .to_initval     = maxtime,
788                 .to_retries     = 0,
789                 .to_maxval      = maxtime,
790         };
791         struct rpc_create_args args = {
792                 .net            = clp->net,
793                 .address        = (struct sockaddr *) &conn->cb_addr,
794                 .addrsize       = conn->cb_addrlen,
795                 .saddress       = (struct sockaddr *) &conn->cb_saddr,
796                 .timeout        = &timeparms,
797                 .program        = &cb_program,
798                 .version        = 1,
799                 .flags          = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
800         };
801         struct rpc_clnt *client;
802         struct rpc_cred *cred;
803 
804         if (clp->cl_minorversion == 0) {
805                 if (!clp->cl_cred.cr_principal &&
806                                 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
807                         return -EINVAL;
808                 args.client_name = clp->cl_cred.cr_principal;
809                 args.prognumber = conn->cb_prog;
810                 args.protocol = XPRT_TRANSPORT_TCP;
811                 args.authflavor = clp->cl_cred.cr_flavor;
812                 clp->cl_cb_ident = conn->cb_ident;
813         } else {
814                 if (!conn->cb_xprt)
815                         return -EINVAL;
816                 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
817                 clp->cl_cb_session = ses;
818                 args.bc_xprt = conn->cb_xprt;
819                 args.prognumber = clp->cl_cb_session->se_cb_prog;
820                 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
821                                 XPRT_TRANSPORT_BC;
822                 args.authflavor = ses->se_cb_sec.flavor;
823         }
824         /* Create RPC client */
825         client = rpc_create(&args);
826         if (IS_ERR(client)) {
827                 dprintk("NFSD: couldn't create callback client: %ld\n",
828                         PTR_ERR(client));
829                 return PTR_ERR(client);
830         }
831         cred = get_backchannel_cred(clp, client, ses);
832         if (IS_ERR(cred)) {
833                 rpc_shutdown_client(client);
834                 return PTR_ERR(cred);
835         }
836         clp->cl_cb_client = client;
837         clp->cl_cb_cred = cred;
838         return 0;
839 }
840 
841 static void warn_no_callback_path(struct nfs4_client *clp, int reason)
842 {
843         dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
844                 (int)clp->cl_name.len, clp->cl_name.data, reason);
845 }
846 
847 static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
848 {
849         if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
850                 return;
851         clp->cl_cb_state = NFSD4_CB_DOWN;
852         warn_no_callback_path(clp, reason);
853 }
854 
855 static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
856 {
857         if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
858                 return;
859         clp->cl_cb_state = NFSD4_CB_FAULT;
860         warn_no_callback_path(clp, reason);
861 }
862 
863 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
864 {
865         struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
866 
867         if (task->tk_status)
868                 nfsd4_mark_cb_down(clp, task->tk_status);
869         else
870                 clp->cl_cb_state = NFSD4_CB_UP;
871 }
872 
873 static const struct rpc_call_ops nfsd4_cb_probe_ops = {
874         /* XXX: release method to ensure we set the cb channel down if
875          * necessary on early failure? */
876         .rpc_call_done = nfsd4_cb_probe_done,
877 };
878 
879 static struct workqueue_struct *callback_wq;
880 
881 /*
882  * Poke the callback thread to process any updates to the callback
883  * parameters, and send a null probe.
884  */
885 void nfsd4_probe_callback(struct nfs4_client *clp)
886 {
887         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
888         set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
889         nfsd4_run_cb(&clp->cl_cb_null);
890 }
891 
892 void nfsd4_probe_callback_sync(struct nfs4_client *clp)
893 {
894         nfsd4_probe_callback(clp);
895         flush_workqueue(callback_wq);
896 }
897 
898 void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
899 {
900         clp->cl_cb_state = NFSD4_CB_UNKNOWN;
901         spin_lock(&clp->cl_lock);
902         memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
903         spin_unlock(&clp->cl_lock);
904 }
905 
906 /*
907  * There's currently a single callback channel slot.
908  * If the slot is available, then mark it busy.  Otherwise, set the
909  * thread for sleeping on the callback RPC wait queue.
910  */
911 static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
912 {
913         if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
914                 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
915                 /* Race breaker */
916                 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
917                         dprintk("%s slot is busy\n", __func__);
918                         return false;
919                 }
920                 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
921         }
922         return true;
923 }
924 
925 /*
926  * TODO: cb_sequence should support referring call lists, cachethis, multiple
927  * slots, and mark callback channel down on communication errors.
928  */
929 static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
930 {
931         struct nfsd4_callback *cb = calldata;
932         struct nfs4_client *clp = cb->cb_clp;
933         u32 minorversion = clp->cl_minorversion;
934 
935         /*
936          * cb_seq_status is only set in decode_cb_sequence4res,
937          * and so will remain 1 if an rpc level failure occurs.
938          */
939         cb->cb_seq_status = 1;
940         cb->cb_status = 0;
941         if (minorversion) {
942                 if (!nfsd41_cb_get_slot(clp, task))
943                         return;
944         }
945         rpc_call_start(task);
946 }
947 
948 static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
949 {
950         struct nfs4_client *clp = cb->cb_clp;
951         struct nfsd4_session *session = clp->cl_cb_session;
952         bool ret = true;
953 
954         if (!clp->cl_minorversion) {
955                 /*
956                  * If the backchannel connection was shut down while this
957                  * task was queued, we need to resubmit it after setting up
958                  * a new backchannel connection.
959                  *
960                  * Note that if we lost our callback connection permanently
961                  * the submission code will error out, so we don't need to
962                  * handle that case here.
963                  */
964                 if (task->tk_flags & RPC_TASK_KILLED)
965                         goto need_restart;
966 
967                 return true;
968         }
969 
970         switch (cb->cb_seq_status) {
971         case 0:
972                 /*
973                  * No need for lock, access serialized in nfsd4_cb_prepare
974                  *
975                  * RFC5661 20.9.3
976                  * If CB_SEQUENCE returns an error, then the state of the slot
977                  * (sequence ID, cached reply) MUST NOT change.
978                  */
979                 ++session->se_cb_seq_nr;
980                 break;
981         case -ESERVERFAULT:
982                 ++session->se_cb_seq_nr;
983         case 1:
984         case -NFS4ERR_BADSESSION:
985                 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
986                 ret = false;
987                 break;
988         case -NFS4ERR_DELAY:
989                 if (!rpc_restart_call(task))
990                         goto out;
991 
992                 rpc_delay(task, 2 * HZ);
993                 return false;
994         case -NFS4ERR_BADSLOT:
995                 goto retry_nowait;
996         case -NFS4ERR_SEQ_MISORDERED:
997                 if (session->se_cb_seq_nr != 1) {
998                         session->se_cb_seq_nr = 1;
999                         goto retry_nowait;
1000                 }
1001                 break;
1002         default:
1003                 dprintk("%s: unprocessed error %d\n", __func__,
1004                         cb->cb_seq_status);
1005         }
1006 
1007         clear_bit(0, &clp->cl_cb_slot_busy);
1008         rpc_wake_up_next(&clp->cl_cb_waitq);
1009         dprintk("%s: freed slot, new seqid=%d\n", __func__,
1010                 clp->cl_cb_session->se_cb_seq_nr);
1011 
1012         if (task->tk_flags & RPC_TASK_KILLED)
1013                 goto need_restart;
1014 out:
1015         return ret;
1016 retry_nowait:
1017         if (rpc_restart_call_prepare(task))
1018                 ret = false;
1019         goto out;
1020 need_restart:
1021         task->tk_status = 0;
1022         cb->cb_need_restart = true;
1023         return false;
1024 }
1025 
1026 static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
1027 {
1028         struct nfsd4_callback *cb = calldata;
1029         struct nfs4_client *clp = cb->cb_clp;
1030 
1031         dprintk("%s: minorversion=%d\n", __func__,
1032                 clp->cl_minorversion);
1033 
1034         if (!nfsd4_cb_sequence_done(task, cb))
1035                 return;
1036 
1037         if (cb->cb_status) {
1038                 WARN_ON_ONCE(task->tk_status);
1039                 task->tk_status = cb->cb_status;
1040         }
1041 
1042         switch (cb->cb_ops->done(cb, task)) {
1043         case 0:
1044                 task->tk_status = 0;
1045                 rpc_restart_call_prepare(task);
1046                 return;
1047         case 1:
1048                 break;
1049         case -1:
1050                 /* Network partition? */
1051                 nfsd4_mark_cb_down(clp, task->tk_status);
1052                 break;
1053         default:
1054                 BUG();
1055         }
1056 }
1057 
1058 static void nfsd4_cb_release(void *calldata)
1059 {
1060         struct nfsd4_callback *cb = calldata;
1061 
1062         if (cb->cb_need_restart)
1063                 nfsd4_run_cb(cb);
1064         else
1065                 cb->cb_ops->release(cb);
1066 
1067 }
1068 
1069 static const struct rpc_call_ops nfsd4_cb_ops = {
1070         .rpc_call_prepare = nfsd4_cb_prepare,
1071         .rpc_call_done = nfsd4_cb_done,
1072         .rpc_release = nfsd4_cb_release,
1073 };
1074 
1075 int nfsd4_create_callback_queue(void)
1076 {
1077         callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
1078         if (!callback_wq)
1079                 return -ENOMEM;
1080         return 0;
1081 }
1082 
1083 void nfsd4_destroy_callback_queue(void)
1084 {
1085         destroy_workqueue(callback_wq);
1086 }
1087 
1088 /* must be called under the state lock */
1089 void nfsd4_shutdown_callback(struct nfs4_client *clp)
1090 {
1091         set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
1092         /*
1093          * Note this won't actually result in a null callback;
1094          * instead, nfsd4_run_cb_null() will detect the killed
1095          * client, destroy the rpc client, and stop:
1096          */
1097         nfsd4_run_cb(&clp->cl_cb_null);
1098         flush_workqueue(callback_wq);
1099 }
1100 
1101 /* requires cl_lock: */
1102 static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
1103 {
1104         struct nfsd4_session *s;
1105         struct nfsd4_conn *c;
1106 
1107         list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
1108                 list_for_each_entry(c, &s->se_conns, cn_persession) {
1109                         if (c->cn_flags & NFS4_CDFC4_BACK)
1110                                 return c;
1111                 }
1112         }
1113         return NULL;
1114 }
1115 
1116 static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
1117 {
1118         struct nfs4_cb_conn conn;
1119         struct nfs4_client *clp = cb->cb_clp;
1120         struct nfsd4_session *ses = NULL;
1121         struct nfsd4_conn *c;
1122         int err;
1123 
1124         /*
1125          * This is either an update, or the client dying; in either case,
1126          * kill the old client:
1127          */
1128         if (clp->cl_cb_client) {
1129                 rpc_shutdown_client(clp->cl_cb_client);
1130                 clp->cl_cb_client = NULL;
1131                 put_rpccred(clp->cl_cb_cred);
1132                 clp->cl_cb_cred = NULL;
1133         }
1134         if (clp->cl_cb_conn.cb_xprt) {
1135                 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1136                 clp->cl_cb_conn.cb_xprt = NULL;
1137         }
1138         if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
1139                 return;
1140         spin_lock(&clp->cl_lock);
1141         /*
1142          * Only serialized callback code is allowed to clear these
1143          * flags; main nfsd code can only set them:
1144          */
1145         BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
1146         clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
1147         memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
1148         c = __nfsd4_find_backchannel(clp);
1149         if (c) {
1150                 svc_xprt_get(c->cn_xprt);
1151                 conn.cb_xprt = c->cn_xprt;
1152                 ses = c->cn_session;
1153         }
1154         spin_unlock(&clp->cl_lock);
1155 
1156         err = setup_callback_client(clp, &conn, ses);
1157         if (err) {
1158                 nfsd4_mark_cb_down(clp, err);
1159                 return;
1160         }
1161 }
1162 
1163 static void
1164 nfsd4_run_cb_work(struct work_struct *work)
1165 {
1166         struct nfsd4_callback *cb =
1167                 container_of(work, struct nfsd4_callback, cb_work);
1168         struct nfs4_client *clp = cb->cb_clp;
1169         struct rpc_clnt *clnt;
1170 
1171         if (cb->cb_need_restart) {
1172                 cb->cb_need_restart = false;
1173         } else {
1174                 if (cb->cb_ops && cb->cb_ops->prepare)
1175                         cb->cb_ops->prepare(cb);
1176         }
1177 
1178         if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
1179                 nfsd4_process_cb_update(cb);
1180 
1181         clnt = clp->cl_cb_client;
1182         if (!clnt) {
1183                 /* Callback channel broken, or client killed; give up: */
1184                 if (cb->cb_ops && cb->cb_ops->release)
1185                         cb->cb_ops->release(cb);
1186                 return;
1187         }
1188 
1189         /*
1190          * Don't send probe messages for 4.1 or later.
1191          */
1192         if (!cb->cb_ops && clp->cl_minorversion) {
1193                 clp->cl_cb_state = NFSD4_CB_UP;
1194                 return;
1195         }
1196 
1197         cb->cb_msg.rpc_cred = clp->cl_cb_cred;
1198         rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
1199                         cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
1200 }
1201 
1202 void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
1203                 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
1204 {
1205         cb->cb_clp = clp;
1206         cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
1207         cb->cb_msg.rpc_argp = cb;
1208         cb->cb_msg.rpc_resp = cb;
1209         cb->cb_ops = ops;
1210         INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
1211         cb->cb_seq_status = 1;
1212         cb->cb_status = 0;
1213         cb->cb_need_restart = false;
1214 }
1215 
1216 void nfsd4_run_cb(struct nfsd4_callback *cb)
1217 {
1218         queue_work(callback_wq, &cb->cb_work);
1219 }
1220 

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