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Linux/fs/lockd/clnt4xdr.c

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  1 /*
  2  * linux/fs/lockd/clnt4xdr.c
  3  *
  4  * XDR functions to encode/decode NLM version 4 RPC arguments and results.
  5  *
  6  * NLM client-side only.
  7  *
  8  * Copyright (C) 2010, Oracle.  All rights reserved.
  9  */
 10 
 11 #include <linux/types.h>
 12 #include <linux/sunrpc/xdr.h>
 13 #include <linux/sunrpc/clnt.h>
 14 #include <linux/sunrpc/stats.h>
 15 #include <linux/lockd/lockd.h>
 16 
 17 #define NLMDBG_FACILITY         NLMDBG_XDR
 18 
 19 #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
 20 #  error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
 21 #endif
 22 
 23 #if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
 24 #  error "NLM host name cannot be larger than NLM's maximum string length!"
 25 #endif
 26 
 27 /*
 28  * Declare the space requirements for NLM arguments and replies as
 29  * number of 32bit-words
 30  */
 31 #define NLM4_void_sz            (0)
 32 #define NLM4_cookie_sz          (1+(NLM_MAXCOOKIELEN>>2))
 33 #define NLM4_caller_sz          (1+(NLMCLNT_OHSIZE>>2))
 34 #define NLM4_owner_sz           (1+(NLMCLNT_OHSIZE>>2))
 35 #define NLM4_fhandle_sz         (1+(NFS3_FHSIZE>>2))
 36 #define NLM4_lock_sz            (5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz)
 37 #define NLM4_holder_sz          (6+NLM4_owner_sz)
 38 
 39 #define NLM4_testargs_sz        (NLM4_cookie_sz+1+NLM4_lock_sz)
 40 #define NLM4_lockargs_sz        (NLM4_cookie_sz+4+NLM4_lock_sz)
 41 #define NLM4_cancargs_sz        (NLM4_cookie_sz+2+NLM4_lock_sz)
 42 #define NLM4_unlockargs_sz      (NLM4_cookie_sz+NLM4_lock_sz)
 43 
 44 #define NLM4_testres_sz         (NLM4_cookie_sz+1+NLM4_holder_sz)
 45 #define NLM4_res_sz             (NLM4_cookie_sz+1)
 46 #define NLM4_norep_sz           (0)
 47 
 48 
 49 static s64 loff_t_to_s64(loff_t offset)
 50 {
 51         s64 res;
 52 
 53         if (offset >= NLM4_OFFSET_MAX)
 54                 res = NLM4_OFFSET_MAX;
 55         else if (offset <= -NLM4_OFFSET_MAX)
 56                 res = -NLM4_OFFSET_MAX;
 57         else
 58                 res = offset;
 59         return res;
 60 }
 61 
 62 static void nlm4_compute_offsets(const struct nlm_lock *lock,
 63                                  u64 *l_offset, u64 *l_len)
 64 {
 65         const struct file_lock *fl = &lock->fl;
 66 
 67         BUG_ON(fl->fl_start > NLM4_OFFSET_MAX);
 68         BUG_ON(fl->fl_end > NLM4_OFFSET_MAX &&
 69                                 fl->fl_end != OFFSET_MAX);
 70 
 71         *l_offset = loff_t_to_s64(fl->fl_start);
 72         if (fl->fl_end == OFFSET_MAX)
 73                 *l_len = 0;
 74         else
 75                 *l_len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
 76 }
 77 
 78 /*
 79  * Handle decode buffer overflows out-of-line.
 80  */
 81 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
 82 {
 83         dprintk("lockd: %s prematurely hit the end of our receive buffer. "
 84                 "Remaining buffer length is %tu words.\n",
 85                 func, xdr->end - xdr->p);
 86 }
 87 
 88 
 89 /*
 90  * Encode/decode NLMv4 basic data types
 91  *
 92  * Basic NLMv4 data types are defined in Appendix II, section 6.1.4
 93  * of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter
 94  * 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W".
 95  *
 96  * Not all basic data types have their own encoding and decoding
 97  * functions.  For run-time efficiency, some data types are encoded
 98  * or decoded inline.
 99  */
100 
101 static void encode_bool(struct xdr_stream *xdr, const int value)
102 {
103         __be32 *p;
104 
105         p = xdr_reserve_space(xdr, 4);
106         *p = value ? xdr_one : xdr_zero;
107 }
108 
109 static void encode_int32(struct xdr_stream *xdr, const s32 value)
110 {
111         __be32 *p;
112 
113         p = xdr_reserve_space(xdr, 4);
114         *p = cpu_to_be32(value);
115 }
116 
117 /*
118  *      typedef opaque netobj<MAXNETOBJ_SZ>
119  */
120 static void encode_netobj(struct xdr_stream *xdr,
121                           const u8 *data, const unsigned int length)
122 {
123         __be32 *p;
124 
125         BUG_ON(length > XDR_MAX_NETOBJ);
126         p = xdr_reserve_space(xdr, 4 + length);
127         xdr_encode_opaque(p, data, length);
128 }
129 
130 static int decode_netobj(struct xdr_stream *xdr,
131                          struct xdr_netobj *obj)
132 {
133         u32 length;
134         __be32 *p;
135 
136         p = xdr_inline_decode(xdr, 4);
137         if (unlikely(p == NULL))
138                 goto out_overflow;
139         length = be32_to_cpup(p++);
140         if (unlikely(length > XDR_MAX_NETOBJ))
141                 goto out_size;
142         obj->len = length;
143         obj->data = (u8 *)p;
144         return 0;
145 out_size:
146         dprintk("NFS: returned netobj was too long: %u\n", length);
147         return -EIO;
148 out_overflow:
149         print_overflow_msg(__func__, xdr);
150         return -EIO;
151 }
152 
153 /*
154  *      netobj cookie;
155  */
156 static void encode_cookie(struct xdr_stream *xdr,
157                           const struct nlm_cookie *cookie)
158 {
159         BUG_ON(cookie->len > NLM_MAXCOOKIELEN);
160         encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
161 }
162 
163 static int decode_cookie(struct xdr_stream *xdr,
164                              struct nlm_cookie *cookie)
165 {
166         u32 length;
167         __be32 *p;
168 
169         p = xdr_inline_decode(xdr, 4);
170         if (unlikely(p == NULL))
171                 goto out_overflow;
172         length = be32_to_cpup(p++);
173         /* apparently HPUX can return empty cookies */
174         if (length == 0)
175                 goto out_hpux;
176         if (length > NLM_MAXCOOKIELEN)
177                 goto out_size;
178         p = xdr_inline_decode(xdr, length);
179         if (unlikely(p == NULL))
180                 goto out_overflow;
181         cookie->len = length;
182         memcpy(cookie->data, p, length);
183         return 0;
184 out_hpux:
185         cookie->len = 4;
186         memset(cookie->data, 0, 4);
187         return 0;
188 out_size:
189         dprintk("NFS: returned cookie was too long: %u\n", length);
190         return -EIO;
191 out_overflow:
192         print_overflow_msg(__func__, xdr);
193         return -EIO;
194 }
195 
196 /*
197  *      netobj fh;
198  */
199 static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
200 {
201         BUG_ON(fh->size > NFS3_FHSIZE);
202         encode_netobj(xdr, (u8 *)&fh->data, fh->size);
203 }
204 
205 /*
206  *      enum nlm4_stats {
207  *              NLM4_GRANTED = 0,
208  *              NLM4_DENIED = 1,
209  *              NLM4_DENIED_NOLOCKS = 2,
210  *              NLM4_BLOCKED = 3,
211  *              NLM4_DENIED_GRACE_PERIOD = 4,
212  *              NLM4_DEADLCK = 5,
213  *              NLM4_ROFS = 6,
214  *              NLM4_STALE_FH = 7,
215  *              NLM4_FBIG = 8,
216  *              NLM4_FAILED = 9
217  *      };
218  *
219  *      struct nlm4_stat {
220  *              nlm4_stats stat;
221  *      };
222  *
223  * NB: we don't swap bytes for the NLM status values.  The upper
224  * layers deal directly with the status value in network byte
225  * order.
226  */
227 static void encode_nlm4_stat(struct xdr_stream *xdr,
228                              const __be32 stat)
229 {
230         __be32 *p;
231 
232         BUG_ON(be32_to_cpu(stat) > NLM_FAILED);
233         p = xdr_reserve_space(xdr, 4);
234         *p = stat;
235 }
236 
237 static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat)
238 {
239         __be32 *p;
240 
241         p = xdr_inline_decode(xdr, 4);
242         if (unlikely(p == NULL))
243                 goto out_overflow;
244         if (unlikely(ntohl(*p) > ntohl(nlm4_failed)))
245                 goto out_bad_xdr;
246         *stat = *p;
247         return 0;
248 out_bad_xdr:
249         dprintk("%s: server returned invalid nlm4_stats value: %u\n",
250                         __func__, be32_to_cpup(p));
251         return -EIO;
252 out_overflow:
253         print_overflow_msg(__func__, xdr);
254         return -EIO;
255 }
256 
257 /*
258  *      struct nlm4_holder {
259  *              bool    exclusive;
260  *              int32   svid;
261  *              netobj  oh;
262  *              uint64  l_offset;
263  *              uint64  l_len;
264  *      };
265  */
266 static void encode_nlm4_holder(struct xdr_stream *xdr,
267                                const struct nlm_res *result)
268 {
269         const struct nlm_lock *lock = &result->lock;
270         u64 l_offset, l_len;
271         __be32 *p;
272 
273         encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
274         encode_int32(xdr, lock->svid);
275         encode_netobj(xdr, lock->oh.data, lock->oh.len);
276 
277         p = xdr_reserve_space(xdr, 4 + 4);
278         nlm4_compute_offsets(lock, &l_offset, &l_len);
279         p = xdr_encode_hyper(p, l_offset);
280         xdr_encode_hyper(p, l_len);
281 }
282 
283 static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
284 {
285         struct nlm_lock *lock = &result->lock;
286         struct file_lock *fl = &lock->fl;
287         u64 l_offset, l_len;
288         u32 exclusive;
289         int error;
290         __be32 *p;
291         s32 end;
292 
293         memset(lock, 0, sizeof(*lock));
294         locks_init_lock(fl);
295 
296         p = xdr_inline_decode(xdr, 4 + 4);
297         if (unlikely(p == NULL))
298                 goto out_overflow;
299         exclusive = be32_to_cpup(p++);
300         lock->svid = be32_to_cpup(p);
301         fl->fl_pid = (pid_t)lock->svid;
302 
303         error = decode_netobj(xdr, &lock->oh);
304         if (unlikely(error))
305                 goto out;
306 
307         p = xdr_inline_decode(xdr, 8 + 8);
308         if (unlikely(p == NULL))
309                 goto out_overflow;
310 
311         fl->fl_flags = FL_POSIX;
312         fl->fl_type  = exclusive != 0 ? F_WRLCK : F_RDLCK;
313         p = xdr_decode_hyper(p, &l_offset);
314         xdr_decode_hyper(p, &l_len);
315         end = l_offset + l_len - 1;
316 
317         fl->fl_start = (loff_t)l_offset;
318         if (l_len == 0 || end < 0)
319                 fl->fl_end = OFFSET_MAX;
320         else
321                 fl->fl_end = (loff_t)end;
322         error = 0;
323 out:
324         return error;
325 out_overflow:
326         print_overflow_msg(__func__, xdr);
327         return -EIO;
328 }
329 
330 /*
331  *      string caller_name<LM_MAXSTRLEN>;
332  */
333 static void encode_caller_name(struct xdr_stream *xdr, const char *name)
334 {
335         /* NB: client-side does not set lock->len */
336         u32 length = strlen(name);
337         __be32 *p;
338 
339         BUG_ON(length > NLM_MAXSTRLEN);
340         p = xdr_reserve_space(xdr, 4 + length);
341         xdr_encode_opaque(p, name, length);
342 }
343 
344 /*
345  *      struct nlm4_lock {
346  *              string  caller_name<LM_MAXSTRLEN>;
347  *              netobj  fh;
348  *              netobj  oh;
349  *              int32   svid;
350  *              uint64  l_offset;
351  *              uint64  l_len;
352  *      };
353  */
354 static void encode_nlm4_lock(struct xdr_stream *xdr,
355                              const struct nlm_lock *lock)
356 {
357         u64 l_offset, l_len;
358         __be32 *p;
359 
360         encode_caller_name(xdr, lock->caller);
361         encode_fh(xdr, &lock->fh);
362         encode_netobj(xdr, lock->oh.data, lock->oh.len);
363 
364         p = xdr_reserve_space(xdr, 4 + 8 + 8);
365         *p++ = cpu_to_be32(lock->svid);
366 
367         nlm4_compute_offsets(lock, &l_offset, &l_len);
368         p = xdr_encode_hyper(p, l_offset);
369         xdr_encode_hyper(p, l_len);
370 }
371 
372 
373 /*
374  * NLMv4 XDR encode functions
375  *
376  * NLMv4 argument types are defined in Appendix II of RFC 1813:
377  * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
378  * "Protocols for Interworking: XNFS, Version 3W".
379  */
380 
381 /*
382  *      struct nlm4_testargs {
383  *              netobj cookie;
384  *              bool exclusive;
385  *              struct nlm4_lock alock;
386  *      };
387  */
388 static void nlm4_xdr_enc_testargs(struct rpc_rqst *req,
389                                   struct xdr_stream *xdr,
390                                   const struct nlm_args *args)
391 {
392         const struct nlm_lock *lock = &args->lock;
393 
394         encode_cookie(xdr, &args->cookie);
395         encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
396         encode_nlm4_lock(xdr, lock);
397 }
398 
399 /*
400  *      struct nlm4_lockargs {
401  *              netobj cookie;
402  *              bool block;
403  *              bool exclusive;
404  *              struct nlm4_lock alock;
405  *              bool reclaim;
406  *              int state;
407  *      };
408  */
409 static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req,
410                                   struct xdr_stream *xdr,
411                                   const struct nlm_args *args)
412 {
413         const struct nlm_lock *lock = &args->lock;
414 
415         encode_cookie(xdr, &args->cookie);
416         encode_bool(xdr, args->block);
417         encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
418         encode_nlm4_lock(xdr, lock);
419         encode_bool(xdr, args->reclaim);
420         encode_int32(xdr, args->state);
421 }
422 
423 /*
424  *      struct nlm4_cancargs {
425  *              netobj cookie;
426  *              bool block;
427  *              bool exclusive;
428  *              struct nlm4_lock alock;
429  *      };
430  */
431 static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req,
432                                   struct xdr_stream *xdr,
433                                   const struct nlm_args *args)
434 {
435         const struct nlm_lock *lock = &args->lock;
436 
437         encode_cookie(xdr, &args->cookie);
438         encode_bool(xdr, args->block);
439         encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
440         encode_nlm4_lock(xdr, lock);
441 }
442 
443 /*
444  *      struct nlm4_unlockargs {
445  *              netobj cookie;
446  *              struct nlm4_lock alock;
447  *      };
448  */
449 static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req,
450                                     struct xdr_stream *xdr,
451                                     const struct nlm_args *args)
452 {
453         const struct nlm_lock *lock = &args->lock;
454 
455         encode_cookie(xdr, &args->cookie);
456         encode_nlm4_lock(xdr, lock);
457 }
458 
459 /*
460  *      struct nlm4_res {
461  *              netobj cookie;
462  *              nlm4_stat stat;
463  *      };
464  */
465 static void nlm4_xdr_enc_res(struct rpc_rqst *req,
466                              struct xdr_stream *xdr,
467                              const struct nlm_res *result)
468 {
469         encode_cookie(xdr, &result->cookie);
470         encode_nlm4_stat(xdr, result->status);
471 }
472 
473 /*
474  *      union nlm4_testrply switch (nlm4_stats stat) {
475  *      case NLM4_DENIED:
476  *              struct nlm4_holder holder;
477  *      default:
478  *              void;
479  *      };
480  *
481  *      struct nlm4_testres {
482  *              netobj cookie;
483  *              nlm4_testrply test_stat;
484  *      };
485  */
486 static void nlm4_xdr_enc_testres(struct rpc_rqst *req,
487                                  struct xdr_stream *xdr,
488                                  const struct nlm_res *result)
489 {
490         encode_cookie(xdr, &result->cookie);
491         encode_nlm4_stat(xdr, result->status);
492         if (result->status == nlm_lck_denied)
493                 encode_nlm4_holder(xdr, result);
494 }
495 
496 
497 /*
498  * NLMv4 XDR decode functions
499  *
500  * NLMv4 argument types are defined in Appendix II of RFC 1813:
501  * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
502  * "Protocols for Interworking: XNFS, Version 3W".
503  */
504 
505 /*
506  *      union nlm4_testrply switch (nlm4_stats stat) {
507  *      case NLM4_DENIED:
508  *              struct nlm4_holder holder;
509  *      default:
510  *              void;
511  *      };
512  *
513  *      struct nlm4_testres {
514  *              netobj cookie;
515  *              nlm4_testrply test_stat;
516  *      };
517  */
518 static int decode_nlm4_testrply(struct xdr_stream *xdr,
519                                 struct nlm_res *result)
520 {
521         int error;
522 
523         error = decode_nlm4_stat(xdr, &result->status);
524         if (unlikely(error))
525                 goto out;
526         if (result->status == nlm_lck_denied)
527                 error = decode_nlm4_holder(xdr, result);
528 out:
529         return error;
530 }
531 
532 static int nlm4_xdr_dec_testres(struct rpc_rqst *req,
533                                 struct xdr_stream *xdr,
534                                 struct nlm_res *result)
535 {
536         int error;
537 
538         error = decode_cookie(xdr, &result->cookie);
539         if (unlikely(error))
540                 goto out;
541         error = decode_nlm4_testrply(xdr, result);
542 out:
543         return error;
544 }
545 
546 /*
547  *      struct nlm4_res {
548  *              netobj cookie;
549  *              nlm4_stat stat;
550  *      };
551  */
552 static int nlm4_xdr_dec_res(struct rpc_rqst *req,
553                             struct xdr_stream *xdr,
554                             struct nlm_res *result)
555 {
556         int error;
557 
558         error = decode_cookie(xdr, &result->cookie);
559         if (unlikely(error))
560                 goto out;
561         error = decode_nlm4_stat(xdr, &result->status);
562 out:
563         return error;
564 }
565 
566 
567 /*
568  * For NLM, a void procedure really returns nothing
569  */
570 #define nlm4_xdr_dec_norep      NULL
571 
572 #define PROC(proc, argtype, restype)                                    \
573 [NLMPROC_##proc] = {                                                    \
574         .p_proc      = NLMPROC_##proc,                                  \
575         .p_encode    = (kxdreproc_t)nlm4_xdr_enc_##argtype,             \
576         .p_decode    = (kxdrdproc_t)nlm4_xdr_dec_##restype,             \
577         .p_arglen    = NLM4_##argtype##_sz,                             \
578         .p_replen    = NLM4_##restype##_sz,                             \
579         .p_statidx   = NLMPROC_##proc,                                  \
580         .p_name      = #proc,                                           \
581         }
582 
583 static struct rpc_procinfo      nlm4_procedures[] = {
584         PROC(TEST,              testargs,       testres),
585         PROC(LOCK,              lockargs,       res),
586         PROC(CANCEL,            cancargs,       res),
587         PROC(UNLOCK,            unlockargs,     res),
588         PROC(GRANTED,           testargs,       res),
589         PROC(TEST_MSG,          testargs,       norep),
590         PROC(LOCK_MSG,          lockargs,       norep),
591         PROC(CANCEL_MSG,        cancargs,       norep),
592         PROC(UNLOCK_MSG,        unlockargs,     norep),
593         PROC(GRANTED_MSG,       testargs,       norep),
594         PROC(TEST_RES,          testres,        norep),
595         PROC(LOCK_RES,          res,            norep),
596         PROC(CANCEL_RES,        res,            norep),
597         PROC(UNLOCK_RES,        res,            norep),
598         PROC(GRANTED_RES,       res,            norep),
599 };
600 
601 const struct rpc_version nlm_version4 = {
602         .number         = 4,
603         .nrprocs        = ARRAY_SIZE(nlm4_procedures),
604         .procs          = nlm4_procedures,
605 };
606 

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