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1/*
2 * linux/fs/lockd/clntxdr.c
3 *
4 * XDR functions to encode/decode NLM version 3 RPC arguments and results.
5 * NLM version 3 is backwards compatible with NLM versions 1 and 2.
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/nfs2.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/*
27 * Declare the space requirements for NLM arguments and replies as
28 * number of 32bit-words
29 */
30#define NLM_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
31#define NLM_caller_sz (1+(NLMCLNT_OHSIZE>>2))
32#define NLM_owner_sz (1+(NLMCLNT_OHSIZE>>2))
33#define NLM_fhandle_sz (1+(NFS2_FHSIZE>>2))
34#define NLM_lock_sz (3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz)
35#define NLM_holder_sz (4+NLM_owner_sz)
36
37#define NLM_testargs_sz (NLM_cookie_sz+1+NLM_lock_sz)
38#define NLM_lockargs_sz (NLM_cookie_sz+4+NLM_lock_sz)
39#define NLM_cancargs_sz (NLM_cookie_sz+2+NLM_lock_sz)
40#define NLM_unlockargs_sz (NLM_cookie_sz+NLM_lock_sz)
41
42#define NLM_testres_sz (NLM_cookie_sz+1+NLM_holder_sz)
43#define NLM_res_sz (NLM_cookie_sz+1)
44#define NLM_norep_sz (0)
45
46
47static s32 loff_t_to_s32(loff_t offset)
48{
49 s32 res;
50
51 if (offset >= NLM_OFFSET_MAX)
52 res = NLM_OFFSET_MAX;
53 else if (offset <= -NLM_OFFSET_MAX)
54 res = -NLM_OFFSET_MAX;
55 else
56 res = offset;
57 return res;
58}
59
60static void nlm_compute_offsets(const struct nlm_lock *lock,
61 u32 *l_offset, u32 *l_len)
62{
63 const struct file_lock *fl = &lock->fl;
64
65 *l_offset = loff_t_to_s32(fl->fl_start);
66 if (fl->fl_end == OFFSET_MAX)
67 *l_len = 0;
68 else
69 *l_len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
70}
71
72/*
73 * Handle decode buffer overflows out-of-line.
74 */
75static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
76{
77 dprintk("lockd: %s prematurely hit the end of our receive buffer. "
78 "Remaining buffer length is %tu words.\n",
79 func, xdr->end - xdr->p);
80}
81
82
83/*
84 * Encode/decode NLMv3 basic data types
85 *
86 * Basic NLMv3 data types are not defined in an IETF standards
87 * document. X/Open has a description of these data types that
88 * is useful. See Chapter 10 of "Protocols for Interworking:
89 * XNFS, Version 3W".
90 *
91 * Not all basic data types have their own encoding and decoding
92 * functions. For run-time efficiency, some data types are encoded
93 * or decoded inline.
94 */
95
96static void encode_bool(struct xdr_stream *xdr, const int value)
97{
98 __be32 *p;
99
100 p = xdr_reserve_space(xdr, 4);
101 *p = value ? xdr_one : xdr_zero;
102}
103
104static void encode_int32(struct xdr_stream *xdr, const s32 value)
105{
106 __be32 *p;
107
108 p = xdr_reserve_space(xdr, 4);
109 *p = cpu_to_be32(value);
110}
111
112/*
113 * typedef opaque netobj<MAXNETOBJ_SZ>
114 */
115static void encode_netobj(struct xdr_stream *xdr,
116 const u8 *data, const unsigned int length)
117{
118 __be32 *p;
119
120 p = xdr_reserve_space(xdr, 4 + length);
121 xdr_encode_opaque(p, data, length);
122}
123
124static int decode_netobj(struct xdr_stream *xdr,
125 struct xdr_netobj *obj)
126{
127 u32 length;
128 __be32 *p;
129
130 p = xdr_inline_decode(xdr, 4);
131 if (unlikely(p == NULL))
132 goto out_overflow;
133 length = be32_to_cpup(p++);
134 if (unlikely(length > XDR_MAX_NETOBJ))
135 goto out_size;
136 obj->len = length;
137 obj->data = (u8 *)p;
138 return 0;
139out_size:
140 dprintk("NFS: returned netobj was too long: %u\n", length);
141 return -EIO;
142out_overflow:
143 print_overflow_msg(__func__, xdr);
144 return -EIO;
145}
146
147/*
148 * netobj cookie;
149 */
150static void encode_cookie(struct xdr_stream *xdr,
151 const struct nlm_cookie *cookie)
152{
153 encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
154}
155
156static int decode_cookie(struct xdr_stream *xdr,
157 struct nlm_cookie *cookie)
158{
159 u32 length;
160 __be32 *p;
161
162 p = xdr_inline_decode(xdr, 4);
163 if (unlikely(p == NULL))
164 goto out_overflow;
165 length = be32_to_cpup(p++);
166 /* apparently HPUX can return empty cookies */
167 if (length == 0)
168 goto out_hpux;
169 if (length > NLM_MAXCOOKIELEN)
170 goto out_size;
171 p = xdr_inline_decode(xdr, length);
172 if (unlikely(p == NULL))
173 goto out_overflow;
174 cookie->len = length;
175 memcpy(cookie->data, p, length);
176 return 0;
177out_hpux:
178 cookie->len = 4;
179 memset(cookie->data, 0, 4);
180 return 0;
181out_size:
182 dprintk("NFS: returned cookie was too long: %u\n", length);
183 return -EIO;
184out_overflow:
185 print_overflow_msg(__func__, xdr);
186 return -EIO;
187}
188
189/*
190 * netobj fh;
191 */
192static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
193{
194 encode_netobj(xdr, (u8 *)&fh->data, NFS2_FHSIZE);
195}
196
197/*
198 * enum nlm_stats {
199 * LCK_GRANTED = 0,
200 * LCK_DENIED = 1,
201 * LCK_DENIED_NOLOCKS = 2,
202 * LCK_BLOCKED = 3,
203 * LCK_DENIED_GRACE_PERIOD = 4
204 * };
205 *
206 *
207 * struct nlm_stat {
208 * nlm_stats stat;
209 * };
210 *
211 * NB: we don't swap bytes for the NLM status values. The upper
212 * layers deal directly with the status value in network byte
213 * order.
214 */
215
216static void encode_nlm_stat(struct xdr_stream *xdr,
217 const __be32 stat)
218{
219 __be32 *p;
220
221 WARN_ON_ONCE(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD);
222 p = xdr_reserve_space(xdr, 4);
223 *p = stat;
224}
225
226static int decode_nlm_stat(struct xdr_stream *xdr,
227 __be32 *stat)
228{
229 __be32 *p;
230
231 p = xdr_inline_decode(xdr, 4);
232 if (unlikely(p == NULL))
233 goto out_overflow;
234 if (unlikely(ntohl(*p) > ntohl(nlm_lck_denied_grace_period)))
235 goto out_enum;
236 *stat = *p;
237 return 0;
238out_enum:
239 dprintk("%s: server returned invalid nlm_stats value: %u\n",
240 __func__, be32_to_cpup(p));
241 return -EIO;
242out_overflow:
243 print_overflow_msg(__func__, xdr);
244 return -EIO;
245}
246
247/*
248 * struct nlm_holder {
249 * bool exclusive;
250 * int uppid;
251 * netobj oh;
252 * unsigned l_offset;
253 * unsigned l_len;
254 * };
255 */
256static void encode_nlm_holder(struct xdr_stream *xdr,
257 const struct nlm_res *result)
258{
259 const struct nlm_lock *lock = &result->lock;
260 u32 l_offset, l_len;
261 __be32 *p;
262
263 encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
264 encode_int32(xdr, lock->svid);
265 encode_netobj(xdr, lock->oh.data, lock->oh.len);
266
267 p = xdr_reserve_space(xdr, 4 + 4);
268 nlm_compute_offsets(lock, &l_offset, &l_len);
269 *p++ = cpu_to_be32(l_offset);
270 *p = cpu_to_be32(l_len);
271}
272
273static int decode_nlm_holder(struct xdr_stream *xdr, struct nlm_res *result)
274{
275 struct nlm_lock *lock = &result->lock;
276 struct file_lock *fl = &lock->fl;
277 u32 exclusive, l_offset, l_len;
278 int error;
279 __be32 *p;
280 s32 end;
281
282 memset(lock, 0, sizeof(*lock));
283 locks_init_lock(fl);
284
285 p = xdr_inline_decode(xdr, 4 + 4);
286 if (unlikely(p == NULL))
287 goto out_overflow;
288 exclusive = be32_to_cpup(p++);
289 lock->svid = be32_to_cpup(p);
290 fl->fl_pid = (pid_t)lock->svid;
291
292 error = decode_netobj(xdr, &lock->oh);
293 if (unlikely(error))
294 goto out;
295
296 p = xdr_inline_decode(xdr, 4 + 4);
297 if (unlikely(p == NULL))
298 goto out_overflow;
299
300 fl->fl_flags = FL_POSIX;
301 fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
302 l_offset = be32_to_cpup(p++);
303 l_len = be32_to_cpup(p);
304 end = l_offset + l_len - 1;
305
306 fl->fl_start = (loff_t)l_offset;
307 if (l_len == 0 || end < 0)
308 fl->fl_end = OFFSET_MAX;
309 else
310 fl->fl_end = (loff_t)end;
311 error = 0;
312out:
313 return error;
314out_overflow:
315 print_overflow_msg(__func__, xdr);
316 return -EIO;
317}
318
319/*
320 * string caller_name<LM_MAXSTRLEN>;
321 */
322static void encode_caller_name(struct xdr_stream *xdr, const char *name)
323{
324 /* NB: client-side does not set lock->len */
325 u32 length = strlen(name);
326 __be32 *p;
327
328 p = xdr_reserve_space(xdr, 4 + length);
329 xdr_encode_opaque(p, name, length);
330}
331
332/*
333 * struct nlm_lock {
334 * string caller_name<LM_MAXSTRLEN>;
335 * netobj fh;
336 * netobj oh;
337 * int uppid;
338 * unsigned l_offset;
339 * unsigned l_len;
340 * };
341 */
342static void encode_nlm_lock(struct xdr_stream *xdr,
343 const struct nlm_lock *lock)
344{
345 u32 l_offset, l_len;
346 __be32 *p;
347
348 encode_caller_name(xdr, lock->caller);
349 encode_fh(xdr, &lock->fh);
350 encode_netobj(xdr, lock->oh.data, lock->oh.len);
351
352 p = xdr_reserve_space(xdr, 4 + 4 + 4);
353 *p++ = cpu_to_be32(lock->svid);
354
355 nlm_compute_offsets(lock, &l_offset, &l_len);
356 *p++ = cpu_to_be32(l_offset);
357 *p = cpu_to_be32(l_len);
358}
359
360
361/*
362 * NLMv3 XDR encode functions
363 *
364 * NLMv3 argument types are defined in Chapter 10 of The Open Group's
365 * "Protocols for Interworking: XNFS, Version 3W".
366 */
367
368/*
369 * struct nlm_testargs {
370 * netobj cookie;
371 * bool exclusive;
372 * struct nlm_lock alock;
373 * };
374 */
375static void nlm_xdr_enc_testargs(struct rpc_rqst *req,
376 struct xdr_stream *xdr,
377 const struct nlm_args *args)
378{
379 const struct nlm_lock *lock = &args->lock;
380
381 encode_cookie(xdr, &args->cookie);
382 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
383 encode_nlm_lock(xdr, lock);
384}
385
386/*
387 * struct nlm_lockargs {
388 * netobj cookie;
389 * bool block;
390 * bool exclusive;
391 * struct nlm_lock alock;
392 * bool reclaim;
393 * int state;
394 * };
395 */
396static void nlm_xdr_enc_lockargs(struct rpc_rqst *req,
397 struct xdr_stream *xdr,
398 const struct nlm_args *args)
399{
400 const struct nlm_lock *lock = &args->lock;
401
402 encode_cookie(xdr, &args->cookie);
403 encode_bool(xdr, args->block);
404 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
405 encode_nlm_lock(xdr, lock);
406 encode_bool(xdr, args->reclaim);
407 encode_int32(xdr, args->state);
408}
409
410/*
411 * struct nlm_cancargs {
412 * netobj cookie;
413 * bool block;
414 * bool exclusive;
415 * struct nlm_lock alock;
416 * };
417 */
418static void nlm_xdr_enc_cancargs(struct rpc_rqst *req,
419 struct xdr_stream *xdr,
420 const struct nlm_args *args)
421{
422 const struct nlm_lock *lock = &args->lock;
423
424 encode_cookie(xdr, &args->cookie);
425 encode_bool(xdr, args->block);
426 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
427 encode_nlm_lock(xdr, lock);
428}
429
430/*
431 * struct nlm_unlockargs {
432 * netobj cookie;
433 * struct nlm_lock alock;
434 * };
435 */
436static void nlm_xdr_enc_unlockargs(struct rpc_rqst *req,
437 struct xdr_stream *xdr,
438 const struct nlm_args *args)
439{
440 const struct nlm_lock *lock = &args->lock;
441
442 encode_cookie(xdr, &args->cookie);
443 encode_nlm_lock(xdr, lock);
444}
445
446/*
447 * struct nlm_res {
448 * netobj cookie;
449 * nlm_stat stat;
450 * };
451 */
452static void nlm_xdr_enc_res(struct rpc_rqst *req,
453 struct xdr_stream *xdr,
454 const struct nlm_res *result)
455{
456 encode_cookie(xdr, &result->cookie);
457 encode_nlm_stat(xdr, result->status);
458}
459
460/*
461 * union nlm_testrply switch (nlm_stats stat) {
462 * case LCK_DENIED:
463 * struct nlm_holder holder;
464 * default:
465 * void;
466 * };
467 *
468 * struct nlm_testres {
469 * netobj cookie;
470 * nlm_testrply test_stat;
471 * };
472 */
473static void encode_nlm_testrply(struct xdr_stream *xdr,
474 const struct nlm_res *result)
475{
476 if (result->status == nlm_lck_denied)
477 encode_nlm_holder(xdr, result);
478}
479
480static void nlm_xdr_enc_testres(struct rpc_rqst *req,
481 struct xdr_stream *xdr,
482 const struct nlm_res *result)
483{
484 encode_cookie(xdr, &result->cookie);
485 encode_nlm_stat(xdr, result->status);
486 encode_nlm_testrply(xdr, result);
487}
488
489
490/*
491 * NLMv3 XDR decode functions
492 *
493 * NLMv3 result types are defined in Chapter 10 of The Open Group's
494 * "Protocols for Interworking: XNFS, Version 3W".
495 */
496
497/*
498 * union nlm_testrply switch (nlm_stats stat) {
499 * case LCK_DENIED:
500 * struct nlm_holder holder;
501 * default:
502 * void;
503 * };
504 *
505 * struct nlm_testres {
506 * netobj cookie;
507 * nlm_testrply test_stat;
508 * };
509 */
510static int decode_nlm_testrply(struct xdr_stream *xdr,
511 struct nlm_res *result)
512{
513 int error;
514
515 error = decode_nlm_stat(xdr, &result->status);
516 if (unlikely(error))
517 goto out;
518 if (result->status == nlm_lck_denied)
519 error = decode_nlm_holder(xdr, result);
520out:
521 return error;
522}
523
524static int nlm_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_nlm_testrply(xdr, result);
534out:
535 return error;
536}
537
538/*
539 * struct nlm_res {
540 * netobj cookie;
541 * nlm_stat stat;
542 * };
543 */
544static int nlm_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_nlm_stat(xdr, &result->status);
554out:
555 return error;
556}
557
558
559/*
560 * For NLM, a void procedure really returns nothing
561 */
562#define nlm_xdr_dec_norep NULL
563
564#define PROC(proc, argtype, restype) \
565[NLMPROC_##proc] = { \
566 .p_proc = NLMPROC_##proc, \
567 .p_encode = (kxdreproc_t)nlm_xdr_enc_##argtype, \
568 .p_decode = (kxdrdproc_t)nlm_xdr_dec_##restype, \
569 .p_arglen = NLM_##argtype##_sz, \
570 .p_replen = NLM_##restype##_sz, \
571 .p_statidx = NLMPROC_##proc, \
572 .p_name = #proc, \
573 }
574
575static struct rpc_procinfo nlm_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
593static const struct rpc_version nlm_version1 = {
594 .number = 1,
595 .nrprocs = ARRAY_SIZE(nlm_procedures),
596 .procs = nlm_procedures,
597};
598
599static const struct rpc_version nlm_version3 = {
600 .number = 3,
601 .nrprocs = ARRAY_SIZE(nlm_procedures),
602 .procs = nlm_procedures,
603};
604
605static const struct rpc_version *nlm_versions[] = {
606 [1] = &nlm_version1,
607 [3] = &nlm_version3,
608#ifdef CONFIG_LOCKD_V4
609 [4] = &nlm_version4,
610#endif
611};
612
613static struct rpc_stat nlm_rpc_stats;
614
615const struct rpc_program nlm_program = {
616 .name = "lockd",
617 .number = NLM_PROGRAM,
618 .nrvers = ARRAY_SIZE(nlm_versions),
619 .version = nlm_versions,
620 .stats = &nlm_rpc_stats,
621};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/clntxdr.c
4 *
5 * XDR functions to encode/decode NLM version 3 RPC arguments and results.
6 * NLM version 3 is backwards compatible with NLM versions 1 and 2.
7 *
8 * NLM client-side only.
9 *
10 * Copyright (C) 2010, Oracle. All rights reserved.
11 */
12
13#include <linux/types.h>
14#include <linux/sunrpc/xdr.h>
15#include <linux/sunrpc/clnt.h>
16#include <linux/sunrpc/stats.h>
17#include <linux/lockd/lockd.h>
18
19#include <uapi/linux/nfs2.h>
20
21#define NLMDBG_FACILITY NLMDBG_XDR
22
23#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
24# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
25#endif
26
27/*
28 * Declare the space requirements for NLM arguments and replies as
29 * number of 32bit-words
30 */
31#define NLM_cookie_sz (1+(NLM_MAXCOOKIELEN>>2))
32#define NLM_caller_sz (1+(NLMCLNT_OHSIZE>>2))
33#define NLM_owner_sz (1+(NLMCLNT_OHSIZE>>2))
34#define NLM_fhandle_sz (1+(NFS2_FHSIZE>>2))
35#define NLM_lock_sz (3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz)
36#define NLM_holder_sz (4+NLM_owner_sz)
37
38#define NLM_testargs_sz (NLM_cookie_sz+1+NLM_lock_sz)
39#define NLM_lockargs_sz (NLM_cookie_sz+4+NLM_lock_sz)
40#define NLM_cancargs_sz (NLM_cookie_sz+2+NLM_lock_sz)
41#define NLM_unlockargs_sz (NLM_cookie_sz+NLM_lock_sz)
42
43#define NLM_testres_sz (NLM_cookie_sz+1+NLM_holder_sz)
44#define NLM_res_sz (NLM_cookie_sz+1)
45#define NLM_norep_sz (0)
46
47
48static s32 loff_t_to_s32(loff_t offset)
49{
50 s32 res;
51
52 if (offset >= NLM_OFFSET_MAX)
53 res = NLM_OFFSET_MAX;
54 else if (offset <= -NLM_OFFSET_MAX)
55 res = -NLM_OFFSET_MAX;
56 else
57 res = offset;
58 return res;
59}
60
61static void nlm_compute_offsets(const struct nlm_lock *lock,
62 u32 *l_offset, u32 *l_len)
63{
64 const struct file_lock *fl = &lock->fl;
65
66 *l_offset = loff_t_to_s32(fl->fl_start);
67 if (fl->fl_end == OFFSET_MAX)
68 *l_len = 0;
69 else
70 *l_len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
71}
72
73/*
74 * Encode/decode NLMv3 basic data types
75 *
76 * Basic NLMv3 data types are not defined in an IETF standards
77 * document. X/Open has a description of these data types that
78 * is useful. See Chapter 10 of "Protocols for Interworking:
79 * XNFS, Version 3W".
80 *
81 * Not all basic data types have their own encoding and decoding
82 * functions. For run-time efficiency, some data types are encoded
83 * or decoded inline.
84 */
85
86static void encode_bool(struct xdr_stream *xdr, const int value)
87{
88 __be32 *p;
89
90 p = xdr_reserve_space(xdr, 4);
91 *p = value ? xdr_one : xdr_zero;
92}
93
94static void encode_int32(struct xdr_stream *xdr, const s32 value)
95{
96 __be32 *p;
97
98 p = xdr_reserve_space(xdr, 4);
99 *p = cpu_to_be32(value);
100}
101
102/*
103 * typedef opaque netobj<MAXNETOBJ_SZ>
104 */
105static void encode_netobj(struct xdr_stream *xdr,
106 const u8 *data, const unsigned int length)
107{
108 __be32 *p;
109
110 p = xdr_reserve_space(xdr, 4 + length);
111 xdr_encode_opaque(p, data, length);
112}
113
114static int decode_netobj(struct xdr_stream *xdr,
115 struct xdr_netobj *obj)
116{
117 ssize_t ret;
118
119 ret = xdr_stream_decode_opaque_inline(xdr, (void *)&obj->data,
120 XDR_MAX_NETOBJ);
121 if (unlikely(ret < 0))
122 return -EIO;
123 obj->len = ret;
124 return 0;
125}
126
127/*
128 * netobj cookie;
129 */
130static void encode_cookie(struct xdr_stream *xdr,
131 const struct nlm_cookie *cookie)
132{
133 encode_netobj(xdr, (u8 *)&cookie->data, cookie->len);
134}
135
136static int decode_cookie(struct xdr_stream *xdr,
137 struct nlm_cookie *cookie)
138{
139 u32 length;
140 __be32 *p;
141
142 p = xdr_inline_decode(xdr, 4);
143 if (unlikely(p == NULL))
144 goto out_overflow;
145 length = be32_to_cpup(p++);
146 /* apparently HPUX can return empty cookies */
147 if (length == 0)
148 goto out_hpux;
149 if (length > NLM_MAXCOOKIELEN)
150 goto out_size;
151 p = xdr_inline_decode(xdr, length);
152 if (unlikely(p == NULL))
153 goto out_overflow;
154 cookie->len = length;
155 memcpy(cookie->data, p, length);
156 return 0;
157out_hpux:
158 cookie->len = 4;
159 memset(cookie->data, 0, 4);
160 return 0;
161out_size:
162 dprintk("NFS: returned cookie was too long: %u\n", length);
163 return -EIO;
164out_overflow:
165 return -EIO;
166}
167
168/*
169 * netobj fh;
170 */
171static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh)
172{
173 encode_netobj(xdr, (u8 *)&fh->data, NFS2_FHSIZE);
174}
175
176/*
177 * enum nlm_stats {
178 * LCK_GRANTED = 0,
179 * LCK_DENIED = 1,
180 * LCK_DENIED_NOLOCKS = 2,
181 * LCK_BLOCKED = 3,
182 * LCK_DENIED_GRACE_PERIOD = 4
183 * };
184 *
185 *
186 * struct nlm_stat {
187 * nlm_stats stat;
188 * };
189 *
190 * NB: we don't swap bytes for the NLM status values. The upper
191 * layers deal directly with the status value in network byte
192 * order.
193 */
194
195static void encode_nlm_stat(struct xdr_stream *xdr,
196 const __be32 stat)
197{
198 __be32 *p;
199
200 WARN_ON_ONCE(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD);
201 p = xdr_reserve_space(xdr, 4);
202 *p = stat;
203}
204
205static int decode_nlm_stat(struct xdr_stream *xdr,
206 __be32 *stat)
207{
208 __be32 *p;
209
210 p = xdr_inline_decode(xdr, 4);
211 if (unlikely(p == NULL))
212 goto out_overflow;
213 if (unlikely(ntohl(*p) > ntohl(nlm_lck_denied_grace_period)))
214 goto out_enum;
215 *stat = *p;
216 return 0;
217out_enum:
218 dprintk("%s: server returned invalid nlm_stats value: %u\n",
219 __func__, be32_to_cpup(p));
220 return -EIO;
221out_overflow:
222 return -EIO;
223}
224
225/*
226 * struct nlm_holder {
227 * bool exclusive;
228 * int uppid;
229 * netobj oh;
230 * unsigned l_offset;
231 * unsigned l_len;
232 * };
233 */
234static void encode_nlm_holder(struct xdr_stream *xdr,
235 const struct nlm_res *result)
236{
237 const struct nlm_lock *lock = &result->lock;
238 u32 l_offset, l_len;
239 __be32 *p;
240
241 encode_bool(xdr, lock->fl.fl_type == F_RDLCK);
242 encode_int32(xdr, lock->svid);
243 encode_netobj(xdr, lock->oh.data, lock->oh.len);
244
245 p = xdr_reserve_space(xdr, 4 + 4);
246 nlm_compute_offsets(lock, &l_offset, &l_len);
247 *p++ = cpu_to_be32(l_offset);
248 *p = cpu_to_be32(l_len);
249}
250
251static int decode_nlm_holder(struct xdr_stream *xdr, struct nlm_res *result)
252{
253 struct nlm_lock *lock = &result->lock;
254 struct file_lock *fl = &lock->fl;
255 u32 exclusive, l_offset, l_len;
256 int error;
257 __be32 *p;
258 s32 end;
259
260 memset(lock, 0, sizeof(*lock));
261 locks_init_lock(fl);
262
263 p = xdr_inline_decode(xdr, 4 + 4);
264 if (unlikely(p == NULL))
265 goto out_overflow;
266 exclusive = be32_to_cpup(p++);
267 lock->svid = be32_to_cpup(p);
268 fl->fl_pid = (pid_t)lock->svid;
269
270 error = decode_netobj(xdr, &lock->oh);
271 if (unlikely(error))
272 goto out;
273
274 p = xdr_inline_decode(xdr, 4 + 4);
275 if (unlikely(p == NULL))
276 goto out_overflow;
277
278 fl->fl_flags = FL_POSIX;
279 fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK;
280 l_offset = be32_to_cpup(p++);
281 l_len = be32_to_cpup(p);
282 end = l_offset + l_len - 1;
283
284 fl->fl_start = (loff_t)l_offset;
285 if (l_len == 0 || end < 0)
286 fl->fl_end = OFFSET_MAX;
287 else
288 fl->fl_end = (loff_t)end;
289 error = 0;
290out:
291 return error;
292out_overflow:
293 return -EIO;
294}
295
296/*
297 * string caller_name<LM_MAXSTRLEN>;
298 */
299static void encode_caller_name(struct xdr_stream *xdr, const char *name)
300{
301 /* NB: client-side does not set lock->len */
302 u32 length = strlen(name);
303 __be32 *p;
304
305 p = xdr_reserve_space(xdr, 4 + length);
306 xdr_encode_opaque(p, name, length);
307}
308
309/*
310 * struct nlm_lock {
311 * string caller_name<LM_MAXSTRLEN>;
312 * netobj fh;
313 * netobj oh;
314 * int uppid;
315 * unsigned l_offset;
316 * unsigned l_len;
317 * };
318 */
319static void encode_nlm_lock(struct xdr_stream *xdr,
320 const struct nlm_lock *lock)
321{
322 u32 l_offset, l_len;
323 __be32 *p;
324
325 encode_caller_name(xdr, lock->caller);
326 encode_fh(xdr, &lock->fh);
327 encode_netobj(xdr, lock->oh.data, lock->oh.len);
328
329 p = xdr_reserve_space(xdr, 4 + 4 + 4);
330 *p++ = cpu_to_be32(lock->svid);
331
332 nlm_compute_offsets(lock, &l_offset, &l_len);
333 *p++ = cpu_to_be32(l_offset);
334 *p = cpu_to_be32(l_len);
335}
336
337
338/*
339 * NLMv3 XDR encode functions
340 *
341 * NLMv3 argument types are defined in Chapter 10 of The Open Group's
342 * "Protocols for Interworking: XNFS, Version 3W".
343 */
344
345/*
346 * struct nlm_testargs {
347 * netobj cookie;
348 * bool exclusive;
349 * struct nlm_lock alock;
350 * };
351 */
352static void nlm_xdr_enc_testargs(struct rpc_rqst *req,
353 struct xdr_stream *xdr,
354 const void *data)
355{
356 const struct nlm_args *args = data;
357 const struct nlm_lock *lock = &args->lock;
358
359 encode_cookie(xdr, &args->cookie);
360 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
361 encode_nlm_lock(xdr, lock);
362}
363
364/*
365 * struct nlm_lockargs {
366 * netobj cookie;
367 * bool block;
368 * bool exclusive;
369 * struct nlm_lock alock;
370 * bool reclaim;
371 * int state;
372 * };
373 */
374static void nlm_xdr_enc_lockargs(struct rpc_rqst *req,
375 struct xdr_stream *xdr,
376 const void *data)
377{
378 const struct nlm_args *args = data;
379 const struct nlm_lock *lock = &args->lock;
380
381 encode_cookie(xdr, &args->cookie);
382 encode_bool(xdr, args->block);
383 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
384 encode_nlm_lock(xdr, lock);
385 encode_bool(xdr, args->reclaim);
386 encode_int32(xdr, args->state);
387}
388
389/*
390 * struct nlm_cancargs {
391 * netobj cookie;
392 * bool block;
393 * bool exclusive;
394 * struct nlm_lock alock;
395 * };
396 */
397static void nlm_xdr_enc_cancargs(struct rpc_rqst *req,
398 struct xdr_stream *xdr,
399 const void *data)
400{
401 const struct nlm_args *args = data;
402 const struct nlm_lock *lock = &args->lock;
403
404 encode_cookie(xdr, &args->cookie);
405 encode_bool(xdr, args->block);
406 encode_bool(xdr, lock->fl.fl_type == F_WRLCK);
407 encode_nlm_lock(xdr, lock);
408}
409
410/*
411 * struct nlm_unlockargs {
412 * netobj cookie;
413 * struct nlm_lock alock;
414 * };
415 */
416static void nlm_xdr_enc_unlockargs(struct rpc_rqst *req,
417 struct xdr_stream *xdr,
418 const void *data)
419{
420 const struct nlm_args *args = data;
421 const struct nlm_lock *lock = &args->lock;
422
423 encode_cookie(xdr, &args->cookie);
424 encode_nlm_lock(xdr, lock);
425}
426
427/*
428 * struct nlm_res {
429 * netobj cookie;
430 * nlm_stat stat;
431 * };
432 */
433static void nlm_xdr_enc_res(struct rpc_rqst *req,
434 struct xdr_stream *xdr,
435 const void *data)
436{
437 const struct nlm_res *result = data;
438
439 encode_cookie(xdr, &result->cookie);
440 encode_nlm_stat(xdr, result->status);
441}
442
443/*
444 * union nlm_testrply switch (nlm_stats stat) {
445 * case LCK_DENIED:
446 * struct nlm_holder holder;
447 * default:
448 * void;
449 * };
450 *
451 * struct nlm_testres {
452 * netobj cookie;
453 * nlm_testrply test_stat;
454 * };
455 */
456static void encode_nlm_testrply(struct xdr_stream *xdr,
457 const struct nlm_res *result)
458{
459 if (result->status == nlm_lck_denied)
460 encode_nlm_holder(xdr, result);
461}
462
463static void nlm_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_nlm_stat(xdr, result->status);
471 encode_nlm_testrply(xdr, result);
472}
473
474
475/*
476 * NLMv3 XDR decode functions
477 *
478 * NLMv3 result types are defined in Chapter 10 of The Open Group's
479 * "Protocols for Interworking: XNFS, Version 3W".
480 */
481
482/*
483 * union nlm_testrply switch (nlm_stats stat) {
484 * case LCK_DENIED:
485 * struct nlm_holder holder;
486 * default:
487 * void;
488 * };
489 *
490 * struct nlm_testres {
491 * netobj cookie;
492 * nlm_testrply test_stat;
493 * };
494 */
495static int decode_nlm_testrply(struct xdr_stream *xdr,
496 struct nlm_res *result)
497{
498 int error;
499
500 error = decode_nlm_stat(xdr, &result->status);
501 if (unlikely(error))
502 goto out;
503 if (result->status == nlm_lck_denied)
504 error = decode_nlm_holder(xdr, result);
505out:
506 return error;
507}
508
509static int nlm_xdr_dec_testres(struct rpc_rqst *req,
510 struct xdr_stream *xdr,
511 void *data)
512{
513 struct nlm_res *result = data;
514 int error;
515
516 error = decode_cookie(xdr, &result->cookie);
517 if (unlikely(error))
518 goto out;
519 error = decode_nlm_testrply(xdr, result);
520out:
521 return error;
522}
523
524/*
525 * struct nlm_res {
526 * netobj cookie;
527 * nlm_stat stat;
528 * };
529 */
530static int nlm_xdr_dec_res(struct rpc_rqst *req,
531 struct xdr_stream *xdr,
532 void *data)
533{
534 struct nlm_res *result = data;
535 int error;
536
537 error = decode_cookie(xdr, &result->cookie);
538 if (unlikely(error))
539 goto out;
540 error = decode_nlm_stat(xdr, &result->status);
541out:
542 return error;
543}
544
545
546/*
547 * For NLM, a void procedure really returns nothing
548 */
549#define nlm_xdr_dec_norep NULL
550
551#define PROC(proc, argtype, restype) \
552[NLMPROC_##proc] = { \
553 .p_proc = NLMPROC_##proc, \
554 .p_encode = nlm_xdr_enc_##argtype, \
555 .p_decode = nlm_xdr_dec_##restype, \
556 .p_arglen = NLM_##argtype##_sz, \
557 .p_replen = NLM_##restype##_sz, \
558 .p_statidx = NLMPROC_##proc, \
559 .p_name = #proc, \
560 }
561
562static const struct rpc_procinfo nlm_procedures[] = {
563 PROC(TEST, testargs, testres),
564 PROC(LOCK, lockargs, res),
565 PROC(CANCEL, cancargs, res),
566 PROC(UNLOCK, unlockargs, res),
567 PROC(GRANTED, testargs, res),
568 PROC(TEST_MSG, testargs, norep),
569 PROC(LOCK_MSG, lockargs, norep),
570 PROC(CANCEL_MSG, cancargs, norep),
571 PROC(UNLOCK_MSG, unlockargs, norep),
572 PROC(GRANTED_MSG, testargs, norep),
573 PROC(TEST_RES, testres, norep),
574 PROC(LOCK_RES, res, norep),
575 PROC(CANCEL_RES, res, norep),
576 PROC(UNLOCK_RES, res, norep),
577 PROC(GRANTED_RES, res, norep),
578};
579
580static unsigned int nlm_version1_counts[ARRAY_SIZE(nlm_procedures)];
581static const struct rpc_version nlm_version1 = {
582 .number = 1,
583 .nrprocs = ARRAY_SIZE(nlm_procedures),
584 .procs = nlm_procedures,
585 .counts = nlm_version1_counts,
586};
587
588static unsigned int nlm_version3_counts[ARRAY_SIZE(nlm_procedures)];
589static const struct rpc_version nlm_version3 = {
590 .number = 3,
591 .nrprocs = ARRAY_SIZE(nlm_procedures),
592 .procs = nlm_procedures,
593 .counts = nlm_version3_counts,
594};
595
596static const struct rpc_version *nlm_versions[] = {
597 [1] = &nlm_version1,
598 [3] = &nlm_version3,
599#ifdef CONFIG_LOCKD_V4
600 [4] = &nlm_version4,
601#endif
602};
603
604static struct rpc_stat nlm_rpc_stats;
605
606const struct rpc_program nlm_program = {
607 .name = "lockd",
608 .number = NLM_PROGRAM,
609 .nrvers = ARRAY_SIZE(nlm_versions),
610 .version = nlm_versions,
611 .stats = &nlm_rpc_stats,
612};