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