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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/clnt4xdr.c
4 *
5 * XDR functions to encode/decode NLM version 4 RPC arguments and results.
6 *
7 * NLM client-side only.
8 *
9 * Copyright (C) 2010, Oracle. All rights reserved.
10 */
11
12#include <linux/types.h>
13#include <linux/sunrpc/xdr.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/stats.h>
16#include <linux/lockd/lockd.h>
17
18#include <uapi/linux/nfs3.h>
19
20#define NLMDBG_FACILITY NLMDBG_XDR
21
22#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
23# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
24#endif
25
26#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
27# error "NLM host name cannot be larger than NLM's maximum string length!"
28#endif
29
30/*
31 * Declare the space requirements for NLM arguments and replies as
32 * number of 32bit-words
33 */
34#define NLM4_void_sz (0)
35#define NLM4_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
36#define NLM4_caller_sz (1+(NLMCLNT_OHSIZE>>2))
37#define NLM4_owner_sz (1+(NLMCLNT_OHSIZE>>2))
38#define NLM4_fhandle_sz (1+(NFS3_FHSIZE>>2))
39#define NLM4_lock_sz (5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz)
40#define NLM4_holder_sz (6+NLM4_owner_sz)
41
42#define NLM4_testargs_sz (NLM4_cookie_sz+1+NLM4_lock_sz)
43#define NLM4_lockargs_sz (NLM4_cookie_sz+4+NLM4_lock_sz)
44#define NLM4_cancargs_sz (NLM4_cookie_sz+2+NLM4_lock_sz)
45#define NLM4_unlockargs_sz (NLM4_cookie_sz+NLM4_lock_sz)
46
47#define NLM4_testres_sz (NLM4_cookie_sz+1+NLM4_holder_sz)
48#define NLM4_res_sz (NLM4_cookie_sz+1)
49#define NLM4_norep_sz (0)
50
51
52static s64 loff_t_to_s64(loff_t offset)
53{
54 s64 res;
55
56 if (offset >= NLM4_OFFSET_MAX)
57 res = NLM4_OFFSET_MAX;
58 else if (offset <= -NLM4_OFFSET_MAX)
59 res = -NLM4_OFFSET_MAX;
60 else
61 res = offset;
62 return res;
63}
64
65static void nlm4_compute_offsets(const struct nlm_lock *lock,
66 u64 *l_offset, u64 *l_len)
67{
68 const struct file_lock *fl = &lock->fl;
69
70 *l_offset = loff_t_to_s64(fl->fl_start);
71 if (fl->fl_end == OFFSET_MAX)
72 *l_len = 0;
73 else
74 *l_len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
75}
76
77/*
78 * Handle decode buffer overflows out-of-line.
79 */
80static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
81{
82 dprintk("lockd: %s prematurely hit the end of our receive buffer. "
83 "Remaining buffer length is %tu words.\n",
84 func, xdr->end - xdr->p);
85}
86
87
88/*
89 * Encode/decode NLMv4 basic data types
90 *
91 * Basic NLMv4 data types are defined in Appendix II, section 6.1.4
92 * of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter
93 * 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W".
94 *
95 * Not all basic data types have their own encoding and decoding
96 * functions. For run-time efficiency, some data types are encoded
97 * or decoded inline.
98 */
99
100static void encode_bool(struct xdr_stream *xdr, const int value)
101{
102 __be32 *p;
103
104 p = xdr_reserve_space(xdr, 4);
105 *p = value ? xdr_one : xdr_zero;
106}
107
108static void encode_int32(struct xdr_stream *xdr, const s32 value)
109{
110 __be32 *p;
111
112 p = xdr_reserve_space(xdr, 4);
113 *p = cpu_to_be32(value);
114}
115
116/*
117 * typedef opaque netobj<MAXNETOBJ_SZ>
118 */
119static void encode_netobj(struct xdr_stream *xdr,
120 const u8 *data, const unsigned int length)
121{
122 __be32 *p;
123
124 p = xdr_reserve_space(xdr, 4 + length);
125 xdr_encode_opaque(p, data, length);
126}
127
128static int decode_netobj(struct xdr_stream *xdr,
129 struct xdr_netobj *obj)
130{
131 u32 length;
132 __be32 *p;
133
134 p = xdr_inline_decode(xdr, 4);
135 if (unlikely(p == NULL))
136 goto out_overflow;
137 length = be32_to_cpup(p++);
138 if (unlikely(length > XDR_MAX_NETOBJ))
139 goto out_size;
140 obj->len = length;
141 obj->data = (u8 *)p;
142 return 0;
143out_size:
144 dprintk("NFS: returned netobj was too long: %u\n", length);
145 return -EIO;
146out_overflow:
147 print_overflow_msg(__func__, xdr);
148 return -EIO;
149}
150
151/*
152 * netobj cookie;
153 */
154static void encode_cookie(struct xdr_stream *xdr,
155 const struct nlm_cookie *cookie)
156{
157 encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
158}
159
160static int decode_cookie(struct xdr_stream *xdr,
161 struct nlm_cookie *cookie)
162{
163 u32 length;
164 __be32 *p;
165
166 p = xdr_inline_decode(xdr, 4);
167 if (unlikely(p == NULL))
168 goto out_overflow;
169 length = be32_to_cpup(p++);
170 /* apparently HPUX can return empty cookies */
171 if (length == 0)
172 goto out_hpux;
173 if (length > NLM_MAXCOOKIELEN)
174 goto out_size;
175 p = xdr_inline_decode(xdr, length);
176 if (unlikely(p == NULL))
177 goto out_overflow;
178 cookie->len = length;
179 memcpy(cookie->data, p, length);
180 return 0;
181out_hpux:
182 cookie->len = 4;
183 memset(cookie->data, 0, 4);
184 return 0;
185out_size:
186 dprintk("NFS: returned cookie was too long: %u\n", length);
187 return -EIO;
188out_overflow:
189 print_overflow_msg(__func__, xdr);
190 return -EIO;
191}
192
193/*
194 * netobj fh;
195 */
196static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
197{
198 encode_netobj(xdr, (u8 *)&fh->data, fh->size);
199}
200
201/*
202 * enum nlm4_stats {
203 * NLM4_GRANTED = 0,
204 * NLM4_DENIED = 1,
205 * NLM4_DENIED_NOLOCKS = 2,
206 * NLM4_BLOCKED = 3,
207 * NLM4_DENIED_GRACE_PERIOD = 4,
208 * NLM4_DEADLCK = 5,
209 * NLM4_ROFS = 6,
210 * NLM4_STALE_FH = 7,
211 * NLM4_FBIG = 8,
212 * NLM4_FAILED = 9
213 * };
214 *
215 * struct nlm4_stat {
216 * nlm4_stats stat;
217 * };
218 *
219 * NB: we don't swap bytes for the NLM status values. The upper
220 * layers deal directly with the status value in network byte
221 * order.
222 */
223static void encode_nlm4_stat(struct xdr_stream *xdr,
224 const __be32 stat)
225{
226 __be32 *p;
227
228 BUG_ON(be32_to_cpu(stat) > NLM_FAILED);
229 p = xdr_reserve_space(xdr, 4);
230 *p = stat;
231}
232
233static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat)
234{
235 __be32 *p;
236
237 p = xdr_inline_decode(xdr, 4);
238 if (unlikely(p == NULL))
239 goto out_overflow;
240 if (unlikely(ntohl(*p) > ntohl(nlm4_failed)))
241 goto out_bad_xdr;
242 *stat = *p;
243 return 0;
244out_bad_xdr:
245 dprintk("%s: server returned invalid nlm4_stats value: %u\n",
246 __func__, be32_to_cpup(p));
247 return -EIO;
248out_overflow:
249 print_overflow_msg(__func__, xdr);
250 return -EIO;
251}
252
253/*
254 * struct nlm4_holder {
255 * bool exclusive;
256 * int32 svid;
257 * netobj oh;
258 * uint64 l_offset;
259 * uint64 l_len;
260 * };
261 */
262static void encode_nlm4_holder(struct xdr_stream *xdr,
263 const struct nlm_res *result)
264{
265 const struct nlm_lock *lock = &result->lock;
266 u64 l_offset, l_len;
267 __be32 *p;
268
269 encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
270 encode_int32(xdr, lock->svid);
271 encode_netobj(xdr, lock->oh.data, lock->oh.len);
272
273 p = xdr_reserve_space(xdr, 4 + 4);
274 nlm4_compute_offsets(lock, &l_offset, &l_len);
275 p = xdr_encode_hyper(p, l_offset);
276 xdr_encode_hyper(p, l_len);
277}
278
279static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
280{
281 struct nlm_lock *lock = &result->lock;
282 struct file_lock *fl = &lock->fl;
283 u64 l_offset, l_len;
284 u32 exclusive;
285 int error;
286 __be32 *p;
287 s32 end;
288
289 memset(lock, 0, sizeof(*lock));
290 locks_init_lock(fl);
291
292 p = xdr_inline_decode(xdr, 4 + 4);
293 if (unlikely(p == NULL))
294 goto out_overflow;
295 exclusive = be32_to_cpup(p++);
296 lock->svid = be32_to_cpup(p);
297 fl->fl_pid = (pid_t)lock->svid;
298
299 error = decode_netobj(xdr, &lock->oh);
300 if (unlikely(error))
301 goto out;
302
303 p = xdr_inline_decode(xdr, 8 + 8);
304 if (unlikely(p == NULL))
305 goto out_overflow;
306
307 fl->fl_flags = FL_POSIX;
308 fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
309 p = xdr_decode_hyper(p, &l_offset);
310 xdr_decode_hyper(p, &l_len);
311 end = l_offset + l_len - 1;
312
313 fl->fl_start = (loff_t)l_offset;
314 if (l_len == 0 || end < 0)
315 fl->fl_end = OFFSET_MAX;
316 else
317 fl->fl_end = (loff_t)end;
318 error = 0;
319out:
320 return error;
321out_overflow:
322 print_overflow_msg(__func__, xdr);
323 return -EIO;
324}
325
326/*
327 * string caller_name<LM_MAXSTRLEN>;
328 */
329static void encode_caller_name(struct xdr_stream *xdr, const char *name)
330{
331 /* NB: client-side does not set lock->len */
332 u32 length = strlen(name);
333 __be32 *p;
334
335 p = xdr_reserve_space(xdr, 4 + length);
336 xdr_encode_opaque(p, name, length);
337}
338
339/*
340 * struct nlm4_lock {
341 * string caller_name<LM_MAXSTRLEN>;
342 * netobj fh;
343 * netobj oh;
344 * int32 svid;
345 * uint64 l_offset;
346 * uint64 l_len;
347 * };
348 */
349static void encode_nlm4_lock(struct xdr_stream *xdr,
350 const struct nlm_lock *lock)
351{
352 u64 l_offset, l_len;
353 __be32 *p;
354
355 encode_caller_name(xdr, lock->caller);
356 encode_fh(xdr, &lock->fh);
357 encode_netobj(xdr, lock->oh.data, lock->oh.len);
358
359 p = xdr_reserve_space(xdr, 4 + 8 + 8);
360 *p++ = cpu_to_be32(lock->svid);
361
362 nlm4_compute_offsets(lock, &l_offset, &l_len);
363 p = xdr_encode_hyper(p, l_offset);
364 xdr_encode_hyper(p, l_len);
365}
366
367
368/*
369 * NLMv4 XDR encode functions
370 *
371 * NLMv4 argument types are defined in Appendix II of RFC 1813:
372 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
373 * "Protocols for Interworking: XNFS, Version 3W".
374 */
375
376/*
377 * struct nlm4_testargs {
378 * netobj cookie;
379 * bool exclusive;
380 * struct nlm4_lock alock;
381 * };
382 */
383static void nlm4_xdr_enc_testargs(struct rpc_rqst *req,
384 struct xdr_stream *xdr,
385 const void *data)
386{
387 const struct nlm_args *args = data;
388 const struct nlm_lock *lock = &args->lock;
389
390 encode_cookie(xdr, &args->cookie);
391 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
392 encode_nlm4_lock(xdr, lock);
393}
394
395/*
396 * struct nlm4_lockargs {
397 * netobj cookie;
398 * bool block;
399 * bool exclusive;
400 * struct nlm4_lock alock;
401 * bool reclaim;
402 * int state;
403 * };
404 */
405static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req,
406 struct xdr_stream *xdr,
407 const void *data)
408{
409 const struct nlm_args *args = data;
410 const struct nlm_lock *lock = &args->lock;
411
412 encode_cookie(xdr, &args->cookie);
413 encode_bool(xdr, args->block);
414 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
415 encode_nlm4_lock(xdr, lock);
416 encode_bool(xdr, args->reclaim);
417 encode_int32(xdr, args->state);
418}
419
420/*
421 * struct nlm4_cancargs {
422 * netobj cookie;
423 * bool block;
424 * bool exclusive;
425 * struct nlm4_lock alock;
426 * };
427 */
428static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req,
429 struct xdr_stream *xdr,
430 const void *data)
431{
432 const struct nlm_args *args = data;
433 const struct nlm_lock *lock = &args->lock;
434
435 encode_cookie(xdr, &args->cookie);
436 encode_bool(xdr, args->block);
437 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
438 encode_nlm4_lock(xdr, lock);
439}
440
441/*
442 * struct nlm4_unlockargs {
443 * netobj cookie;
444 * struct nlm4_lock alock;
445 * };
446 */
447static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req,
448 struct xdr_stream *xdr,
449 const void *data)
450{
451 const struct nlm_args *args = data;
452 const struct nlm_lock *lock = &args->lock;
453
454 encode_cookie(xdr, &args->cookie);
455 encode_nlm4_lock(xdr, lock);
456}
457
458/*
459 * struct nlm4_res {
460 * netobj cookie;
461 * nlm4_stat stat;
462 * };
463 */
464static void nlm4_xdr_enc_res(struct rpc_rqst *req,
465 struct xdr_stream *xdr,
466 const void *data)
467{
468 const struct nlm_res *result = data;
469
470 encode_cookie(xdr, &result->cookie);
471 encode_nlm4_stat(xdr, result->status);
472}
473
474/*
475 * union nlm4_testrply switch (nlm4_stats stat) {
476 * case NLM4_DENIED:
477 * struct nlm4_holder holder;
478 * default:
479 * void;
480 * };
481 *
482 * struct nlm4_testres {
483 * netobj cookie;
484 * nlm4_testrply test_stat;
485 * };
486 */
487static void nlm4_xdr_enc_testres(struct rpc_rqst *req,
488 struct xdr_stream *xdr,
489 const void *data)
490{
491 const struct nlm_res *result = data;
492
493 encode_cookie(xdr, &result->cookie);
494 encode_nlm4_stat(xdr, result->status);
495 if (result->status == nlm_lck_denied)
496 encode_nlm4_holder(xdr, result);
497}
498
499
500/*
501 * NLMv4 XDR decode functions
502 *
503 * NLMv4 argument types are defined in Appendix II of RFC 1813:
504 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
505 * "Protocols for Interworking: XNFS, Version 3W".
506 */
507
508/*
509 * union nlm4_testrply switch (nlm4_stats stat) {
510 * case NLM4_DENIED:
511 * struct nlm4_holder holder;
512 * default:
513 * void;
514 * };
515 *
516 * struct nlm4_testres {
517 * netobj cookie;
518 * nlm4_testrply test_stat;
519 * };
520 */
521static int decode_nlm4_testrply(struct xdr_stream *xdr,
522 struct nlm_res *result)
523{
524 int error;
525
526 error = decode_nlm4_stat(xdr, &result->status);
527 if (unlikely(error))
528 goto out;
529 if (result->status == nlm_lck_denied)
530 error = decode_nlm4_holder(xdr, result);
531out:
532 return error;
533}
534
535static int nlm4_xdr_dec_testres(struct rpc_rqst *req,
536 struct xdr_stream *xdr,
537 void *data)
538{
539 struct nlm_res *result = data;
540 int error;
541
542 error = decode_cookie(xdr, &result->cookie);
543 if (unlikely(error))
544 goto out;
545 error = decode_nlm4_testrply(xdr, result);
546out:
547 return error;
548}
549
550/*
551 * struct nlm4_res {
552 * netobj cookie;
553 * nlm4_stat stat;
554 * };
555 */
556static int nlm4_xdr_dec_res(struct rpc_rqst *req,
557 struct xdr_stream *xdr,
558 void *data)
559{
560 struct nlm_res *result = data;
561 int error;
562
563 error = decode_cookie(xdr, &result->cookie);
564 if (unlikely(error))
565 goto out;
566 error = decode_nlm4_stat(xdr, &result->status);
567out:
568 return error;
569}
570
571
572/*
573 * For NLM, a void procedure really returns nothing
574 */
575#define nlm4_xdr_dec_norep NULL
576
577#define PROC(proc, argtype, restype) \
578[NLMPROC_##proc] = { \
579 .p_proc = NLMPROC_##proc, \
580 .p_encode = nlm4_xdr_enc_##argtype, \
581 .p_decode = nlm4_xdr_dec_##restype, \
582 .p_arglen = NLM4_##argtype##_sz, \
583 .p_replen = NLM4_##restype##_sz, \
584 .p_statidx = NLMPROC_##proc, \
585 .p_name = #proc, \
586 }
587
588static const struct rpc_procinfo nlm4_procedures[] = {
589 PROC(TEST, testargs, testres),
590 PROC(LOCK, lockargs, res),
591 PROC(CANCEL, cancargs, res),
592 PROC(UNLOCK, unlockargs, res),
593 PROC(GRANTED, testargs, res),
594 PROC(TEST_MSG, testargs, norep),
595 PROC(LOCK_MSG, lockargs, norep),
596 PROC(CANCEL_MSG, cancargs, norep),
597 PROC(UNLOCK_MSG, unlockargs, norep),
598 PROC(GRANTED_MSG, testargs, norep),
599 PROC(TEST_RES, testres, norep),
600 PROC(LOCK_RES, res, norep),
601 PROC(CANCEL_RES, res, norep),
602 PROC(UNLOCK_RES, res, norep),
603 PROC(GRANTED_RES, res, norep),
604};
605
606static unsigned int nlm_version4_counts[ARRAY_SIZE(nlm4_procedures)];
607const struct rpc_version nlm_version4 = {
608 .number = 4,
609 .nrprocs = ARRAY_SIZE(nlm4_procedures),
610 .procs = nlm4_procedures,
611 .counts = nlm_version4_counts,
612};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/clnt4xdr.c
4 *
5 * XDR functions to encode/decode NLM version 4 RPC arguments and results.
6 *
7 * NLM client-side only.
8 *
9 * Copyright (C) 2010, Oracle. All rights reserved.
10 */
11
12#include <linux/types.h>
13#include <linux/sunrpc/xdr.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/stats.h>
16#include <linux/lockd/lockd.h>
17
18#include <uapi/linux/nfs3.h>
19
20#define NLMDBG_FACILITY NLMDBG_XDR
21
22#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
23# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
24#endif
25
26#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
27# error "NLM host name cannot be larger than NLM's maximum string length!"
28#endif
29
30/*
31 * Declare the space requirements for NLM arguments and replies as
32 * number of 32bit-words
33 */
34#define NLM4_void_sz (0)
35#define NLM4_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
36#define NLM4_caller_sz (1+(NLMCLNT_OHSIZE>>2))
37#define NLM4_owner_sz (1+(NLMCLNT_OHSIZE>>2))
38#define NLM4_fhandle_sz (1+(NFS3_FHSIZE>>2))
39#define NLM4_lock_sz (5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz)
40#define NLM4_holder_sz (6+NLM4_owner_sz)
41
42#define NLM4_testargs_sz (NLM4_cookie_sz+1+NLM4_lock_sz)
43#define NLM4_lockargs_sz (NLM4_cookie_sz+4+NLM4_lock_sz)
44#define NLM4_cancargs_sz (NLM4_cookie_sz+2+NLM4_lock_sz)
45#define NLM4_unlockargs_sz (NLM4_cookie_sz+NLM4_lock_sz)
46
47#define NLM4_testres_sz (NLM4_cookie_sz+1+NLM4_holder_sz)
48#define NLM4_res_sz (NLM4_cookie_sz+1)
49#define NLM4_norep_sz (0)
50
51
52static s64 loff_t_to_s64(loff_t offset)
53{
54 s64 res;
55
56 if (offset >= NLM4_OFFSET_MAX)
57 res = NLM4_OFFSET_MAX;
58 else if (offset <= -NLM4_OFFSET_MAX)
59 res = -NLM4_OFFSET_MAX;
60 else
61 res = offset;
62 return res;
63}
64
65static void nlm4_compute_offsets(const struct nlm_lock *lock,
66 u64 *l_offset, u64 *l_len)
67{
68 const struct file_lock *fl = &lock->fl;
69
70 *l_offset = loff_t_to_s64(fl->fl_start);
71 if (fl->fl_end == OFFSET_MAX)
72 *l_len = 0;
73 else
74 *l_len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
75}
76
77/*
78 * Encode/decode NLMv4 basic data types
79 *
80 * Basic NLMv4 data types are defined in Appendix II, section 6.1.4
81 * of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter
82 * 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W".
83 *
84 * Not all basic data types have their own encoding and decoding
85 * functions. For run-time efficiency, some data types are encoded
86 * or decoded inline.
87 */
88
89static void encode_bool(struct xdr_stream *xdr, const int value)
90{
91 __be32 *p;
92
93 p = xdr_reserve_space(xdr, 4);
94 *p = value ? xdr_one : xdr_zero;
95}
96
97static void encode_int32(struct xdr_stream *xdr, const s32 value)
98{
99 __be32 *p;
100
101 p = xdr_reserve_space(xdr, 4);
102 *p = cpu_to_be32(value);
103}
104
105/*
106 * typedef opaque netobj<MAXNETOBJ_SZ>
107 */
108static void encode_netobj(struct xdr_stream *xdr,
109 const u8 *data, const unsigned int length)
110{
111 __be32 *p;
112
113 p = xdr_reserve_space(xdr, 4 + length);
114 xdr_encode_opaque(p, data, length);
115}
116
117static int decode_netobj(struct xdr_stream *xdr,
118 struct xdr_netobj *obj)
119{
120 ssize_t ret;
121
122 ret = xdr_stream_decode_opaque_inline(xdr, (void *)&obj->data,
123 XDR_MAX_NETOBJ);
124 if (unlikely(ret < 0))
125 return -EIO;
126 obj->len = ret;
127 return 0;
128}
129
130/*
131 * netobj cookie;
132 */
133static void encode_cookie(struct xdr_stream *xdr,
134 const struct nlm_cookie *cookie)
135{
136 encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
137}
138
139static int decode_cookie(struct xdr_stream *xdr,
140 struct nlm_cookie *cookie)
141{
142 u32 length;
143 __be32 *p;
144
145 p = xdr_inline_decode(xdr, 4);
146 if (unlikely(p == NULL))
147 goto out_overflow;
148 length = be32_to_cpup(p++);
149 /* apparently HPUX can return empty cookies */
150 if (length == 0)
151 goto out_hpux;
152 if (length > NLM_MAXCOOKIELEN)
153 goto out_size;
154 p = xdr_inline_decode(xdr, length);
155 if (unlikely(p == NULL))
156 goto out_overflow;
157 cookie->len = length;
158 memcpy(cookie->data, p, length);
159 return 0;
160out_hpux:
161 cookie->len = 4;
162 memset(cookie->data, 0, 4);
163 return 0;
164out_size:
165 dprintk("NFS: returned cookie was too long: %u\n", length);
166 return -EIO;
167out_overflow:
168 return -EIO;
169}
170
171/*
172 * netobj fh;
173 */
174static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
175{
176 encode_netobj(xdr, (u8 *)&fh->data, fh->size);
177}
178
179/*
180 * enum nlm4_stats {
181 * NLM4_GRANTED = 0,
182 * NLM4_DENIED = 1,
183 * NLM4_DENIED_NOLOCKS = 2,
184 * NLM4_BLOCKED = 3,
185 * NLM4_DENIED_GRACE_PERIOD = 4,
186 * NLM4_DEADLCK = 5,
187 * NLM4_ROFS = 6,
188 * NLM4_STALE_FH = 7,
189 * NLM4_FBIG = 8,
190 * NLM4_FAILED = 9
191 * };
192 *
193 * struct nlm4_stat {
194 * nlm4_stats stat;
195 * };
196 *
197 * NB: we don't swap bytes for the NLM status values. The upper
198 * layers deal directly with the status value in network byte
199 * order.
200 */
201static void encode_nlm4_stat(struct xdr_stream *xdr,
202 const __be32 stat)
203{
204 __be32 *p;
205
206 BUG_ON(be32_to_cpu(stat) > NLM_FAILED);
207 p = xdr_reserve_space(xdr, 4);
208 *p = stat;
209}
210
211static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat)
212{
213 __be32 *p;
214
215 p = xdr_inline_decode(xdr, 4);
216 if (unlikely(p == NULL))
217 goto out_overflow;
218 if (unlikely(ntohl(*p) > ntohl(nlm4_failed)))
219 goto out_bad_xdr;
220 *stat = *p;
221 return 0;
222out_bad_xdr:
223 dprintk("%s: server returned invalid nlm4_stats value: %u\n",
224 __func__, be32_to_cpup(p));
225 return -EIO;
226out_overflow:
227 return -EIO;
228}
229
230/*
231 * struct nlm4_holder {
232 * bool exclusive;
233 * int32 svid;
234 * netobj oh;
235 * uint64 l_offset;
236 * uint64 l_len;
237 * };
238 */
239static void encode_nlm4_holder(struct xdr_stream *xdr,
240 const struct nlm_res *result)
241{
242 const struct nlm_lock *lock = &result->lock;
243 u64 l_offset, l_len;
244 __be32 *p;
245
246 encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
247 encode_int32(xdr, lock->svid);
248 encode_netobj(xdr, lock->oh.data, lock->oh.len);
249
250 p = xdr_reserve_space(xdr, 4 + 4);
251 nlm4_compute_offsets(lock, &l_offset, &l_len);
252 p = xdr_encode_hyper(p, l_offset);
253 xdr_encode_hyper(p, l_len);
254}
255
256static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result)
257{
258 struct nlm_lock *lock = &result->lock;
259 struct file_lock *fl = &lock->fl;
260 u64 l_offset, l_len;
261 u32 exclusive;
262 int error;
263 __be32 *p;
264 s32 end;
265
266 memset(lock, 0, sizeof(*lock));
267 locks_init_lock(fl);
268
269 p = xdr_inline_decode(xdr, 4 + 4);
270 if (unlikely(p == NULL))
271 goto out_overflow;
272 exclusive = be32_to_cpup(p++);
273 lock->svid = be32_to_cpup(p);
274 fl->fl_pid = (pid_t)lock->svid;
275
276 error = decode_netobj(xdr, &lock->oh);
277 if (unlikely(error))
278 goto out;
279
280 p = xdr_inline_decode(xdr, 8 + 8);
281 if (unlikely(p == NULL))
282 goto out_overflow;
283
284 fl->fl_flags = FL_POSIX;
285 fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
286 p = xdr_decode_hyper(p, &l_offset);
287 xdr_decode_hyper(p, &l_len);
288 end = l_offset + l_len - 1;
289
290 fl->fl_start = (loff_t)l_offset;
291 if (l_len == 0 || end < 0)
292 fl->fl_end = OFFSET_MAX;
293 else
294 fl->fl_end = (loff_t)end;
295 error = 0;
296out:
297 return error;
298out_overflow:
299 return -EIO;
300}
301
302/*
303 * string caller_name<LM_MAXSTRLEN>;
304 */
305static void encode_caller_name(struct xdr_stream *xdr, const char *name)
306{
307 /* NB: client-side does not set lock->len */
308 u32 length = strlen(name);
309 __be32 *p;
310
311 p = xdr_reserve_space(xdr, 4 + length);
312 xdr_encode_opaque(p, name, length);
313}
314
315/*
316 * struct nlm4_lock {
317 * string caller_name<LM_MAXSTRLEN>;
318 * netobj fh;
319 * netobj oh;
320 * int32 svid;
321 * uint64 l_offset;
322 * uint64 l_len;
323 * };
324 */
325static void encode_nlm4_lock(struct xdr_stream *xdr,
326 const struct nlm_lock *lock)
327{
328 u64 l_offset, l_len;
329 __be32 *p;
330
331 encode_caller_name(xdr, lock->caller);
332 encode_fh(xdr, &lock->fh);
333 encode_netobj(xdr, lock->oh.data, lock->oh.len);
334
335 p = xdr_reserve_space(xdr, 4 + 8 + 8);
336 *p++ = cpu_to_be32(lock->svid);
337
338 nlm4_compute_offsets(lock, &l_offset, &l_len);
339 p = xdr_encode_hyper(p, l_offset);
340 xdr_encode_hyper(p, l_len);
341}
342
343
344/*
345 * NLMv4 XDR encode functions
346 *
347 * NLMv4 argument types are defined in Appendix II of RFC 1813:
348 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
349 * "Protocols for Interworking: XNFS, Version 3W".
350 */
351
352/*
353 * struct nlm4_testargs {
354 * netobj cookie;
355 * bool exclusive;
356 * struct nlm4_lock alock;
357 * };
358 */
359static void nlm4_xdr_enc_testargs(struct rpc_rqst *req,
360 struct xdr_stream *xdr,
361 const void *data)
362{
363 const struct nlm_args *args = data;
364 const struct nlm_lock *lock = &args->lock;
365
366 encode_cookie(xdr, &args->cookie);
367 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
368 encode_nlm4_lock(xdr, lock);
369}
370
371/*
372 * struct nlm4_lockargs {
373 * netobj cookie;
374 * bool block;
375 * bool exclusive;
376 * struct nlm4_lock alock;
377 * bool reclaim;
378 * int state;
379 * };
380 */
381static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req,
382 struct xdr_stream *xdr,
383 const void *data)
384{
385 const struct nlm_args *args = data;
386 const struct nlm_lock *lock = &args->lock;
387
388 encode_cookie(xdr, &args->cookie);
389 encode_bool(xdr, args->block);
390 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
391 encode_nlm4_lock(xdr, lock);
392 encode_bool(xdr, args->reclaim);
393 encode_int32(xdr, args->state);
394}
395
396/*
397 * struct nlm4_cancargs {
398 * netobj cookie;
399 * bool block;
400 * bool exclusive;
401 * struct nlm4_lock alock;
402 * };
403 */
404static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req,
405 struct xdr_stream *xdr,
406 const void *data)
407{
408 const struct nlm_args *args = data;
409 const struct nlm_lock *lock = &args->lock;
410
411 encode_cookie(xdr, &args->cookie);
412 encode_bool(xdr, args->block);
413 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
414 encode_nlm4_lock(xdr, lock);
415}
416
417/*
418 * struct nlm4_unlockargs {
419 * netobj cookie;
420 * struct nlm4_lock alock;
421 * };
422 */
423static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req,
424 struct xdr_stream *xdr,
425 const void *data)
426{
427 const struct nlm_args *args = data;
428 const struct nlm_lock *lock = &args->lock;
429
430 encode_cookie(xdr, &args->cookie);
431 encode_nlm4_lock(xdr, lock);
432}
433
434/*
435 * struct nlm4_res {
436 * netobj cookie;
437 * nlm4_stat stat;
438 * };
439 */
440static void nlm4_xdr_enc_res(struct rpc_rqst *req,
441 struct xdr_stream *xdr,
442 const void *data)
443{
444 const struct nlm_res *result = data;
445
446 encode_cookie(xdr, &result->cookie);
447 encode_nlm4_stat(xdr, result->status);
448}
449
450/*
451 * union nlm4_testrply switch (nlm4_stats stat) {
452 * case NLM4_DENIED:
453 * struct nlm4_holder holder;
454 * default:
455 * void;
456 * };
457 *
458 * struct nlm4_testres {
459 * netobj cookie;
460 * nlm4_testrply test_stat;
461 * };
462 */
463static void nlm4_xdr_enc_testres(struct rpc_rqst *req,
464 struct xdr_stream *xdr,
465 const void *data)
466{
467 const struct nlm_res *result = data;
468
469 encode_cookie(xdr, &result->cookie);
470 encode_nlm4_stat(xdr, result->status);
471 if (result->status == nlm_lck_denied)
472 encode_nlm4_holder(xdr, result);
473}
474
475
476/*
477 * NLMv4 XDR decode functions
478 *
479 * NLMv4 argument types are defined in Appendix II of RFC 1813:
480 * "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's
481 * "Protocols for Interworking: XNFS, Version 3W".
482 */
483
484/*
485 * union nlm4_testrply switch (nlm4_stats stat) {
486 * case NLM4_DENIED:
487 * struct nlm4_holder holder;
488 * default:
489 * void;
490 * };
491 *
492 * struct nlm4_testres {
493 * netobj cookie;
494 * nlm4_testrply test_stat;
495 * };
496 */
497static int decode_nlm4_testrply(struct xdr_stream *xdr,
498 struct nlm_res *result)
499{
500 int error;
501
502 error = decode_nlm4_stat(xdr, &result->status);
503 if (unlikely(error))
504 goto out;
505 if (result->status == nlm_lck_denied)
506 error = decode_nlm4_holder(xdr, result);
507out:
508 return error;
509}
510
511static int nlm4_xdr_dec_testres(struct rpc_rqst *req,
512 struct xdr_stream *xdr,
513 void *data)
514{
515 struct nlm_res *result = data;
516 int error;
517
518 error = decode_cookie(xdr, &result->cookie);
519 if (unlikely(error))
520 goto out;
521 error = decode_nlm4_testrply(xdr, result);
522out:
523 return error;
524}
525
526/*
527 * struct nlm4_res {
528 * netobj cookie;
529 * nlm4_stat stat;
530 * };
531 */
532static int nlm4_xdr_dec_res(struct rpc_rqst *req,
533 struct xdr_stream *xdr,
534 void *data)
535{
536 struct nlm_res *result = data;
537 int error;
538
539 error = decode_cookie(xdr, &result->cookie);
540 if (unlikely(error))
541 goto out;
542 error = decode_nlm4_stat(xdr, &result->status);
543out:
544 return error;
545}
546
547
548/*
549 * For NLM, a void procedure really returns nothing
550 */
551#define nlm4_xdr_dec_norep NULL
552
553#define PROC(proc, argtype, restype) \
554[NLMPROC_##proc] = { \
555 .p_proc = NLMPROC_##proc, \
556 .p_encode = nlm4_xdr_enc_##argtype, \
557 .p_decode = nlm4_xdr_dec_##restype, \
558 .p_arglen = NLM4_##argtype##_sz, \
559 .p_replen = NLM4_##restype##_sz, \
560 .p_statidx = NLMPROC_##proc, \
561 .p_name = #proc, \
562 }
563
564static const struct rpc_procinfo nlm4_procedures[] = {
565 PROC(TEST, testargs, testres),
566 PROC(LOCK, lockargs, res),
567 PROC(CANCEL, cancargs, res),
568 PROC(UNLOCK, unlockargs, res),
569 PROC(GRANTED, testargs, res),
570 PROC(TEST_MSG, testargs, norep),
571 PROC(LOCK_MSG, lockargs, norep),
572 PROC(CANCEL_MSG, cancargs, norep),
573 PROC(UNLOCK_MSG, unlockargs, norep),
574 PROC(GRANTED_MSG, testargs, norep),
575 PROC(TEST_RES, testres, norep),
576 PROC(LOCK_RES, res, norep),
577 PROC(CANCEL_RES, res, norep),
578 PROC(UNLOCK_RES, res, norep),
579 PROC(GRANTED_RES, res, norep),
580};
581
582static unsigned int nlm_version4_counts[ARRAY_SIZE(nlm4_procedures)];
583const struct rpc_version nlm_version4 = {
584 .number = 4,
585 .nrprocs = ARRAY_SIZE(nlm4_procedures),
586 .procs = nlm4_procedures,
587 .counts = nlm_version4_counts,
588};