1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * XDR standard data types and function declarations
4 *
5 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
6 *
7 * Based on:
8 * RFC 4506 "XDR: External Data Representation Standard", May 2006
9 */
10
11 #ifndef _SUNRPC_XDR_H_
12 #define _SUNRPC_XDR_H_
13
14 #include <linux/uio.h>
15 #include <asm/byteorder.h>
16 #include <asm/unaligned.h>
17 #include <linux/scatterlist.h>
18
19 struct bio_vec;
20 struct rpc_rqst;
21
22 /*
23 * Buffer adjustment
24 */
25 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
26
27 /*
28 * Generic opaque `network object.' At the kernel level, this type
29 * is used only by lockd.
30 */
31 #define XDR_MAX_NETOBJ 1024
32 struct xdr_netobj {
33 unsigned int len;
34 u8 * data;
35 };
36
37 /*
38 * Basic structure for transmission/reception of a client XDR message.
39 * Features a header (for a linear buffer containing RPC headers
40 * and the data payload for short messages), and then an array of
41 * pages.
42 * The tail iovec allows you to append data after the page array. Its
43 * main interest is for appending padding to the pages in order to
44 * satisfy the int_32-alignment requirements in RFC1832.
45 *
46 * For the future, we might want to string several of these together
47 * in a list if anybody wants to make use of NFSv4 COMPOUND
48 * operations and/or has a need for scatter/gather involving pages.
49 */
50 struct xdr_buf {
51 struct kvec head[1], /* RPC header + non-page data */
52 tail[1]; /* Appended after page data */
53
54 struct bio_vec *bvec;
55 struct page ** pages; /* Array of pages */
56 unsigned int page_base, /* Start of page data */
57 page_len, /* Length of page data */
58 flags; /* Flags for data disposition */
59 #define XDRBUF_READ 0x01 /* target of file read */
60 #define XDRBUF_WRITE 0x02 /* source of file write */
61 #define XDRBUF_SPARSE_PAGES 0x04 /* Page array is sparse */
62
63 unsigned int buflen, /* Total length of storage buffer */
64 len; /* Length of XDR encoded message */
65 };
66
67 static inline void
xdr_buf_init(struct xdr_buf * buf,void * start,size_t len)68 xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
69 {
70 buf->head[0].iov_base = start;
71 buf->head[0].iov_len = len;
72 buf->tail[0].iov_len = 0;
73 buf->pages = NULL;
74 buf->page_len = 0;
75 buf->flags = 0;
76 buf->len = 0;
77 buf->buflen = len;
78 }
79
80 /*
81 * pre-xdr'ed macros.
82 */
83
84 #define xdr_zero cpu_to_be32(0)
85 #define xdr_one cpu_to_be32(1)
86 #define xdr_two cpu_to_be32(2)
87
88 #define rpc_auth_null cpu_to_be32(RPC_AUTH_NULL)
89 #define rpc_auth_unix cpu_to_be32(RPC_AUTH_UNIX)
90 #define rpc_auth_short cpu_to_be32(RPC_AUTH_SHORT)
91 #define rpc_auth_gss cpu_to_be32(RPC_AUTH_GSS)
92
93 #define rpc_call cpu_to_be32(RPC_CALL)
94 #define rpc_reply cpu_to_be32(RPC_REPLY)
95
96 #define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
97
98 #define rpc_success cpu_to_be32(RPC_SUCCESS)
99 #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
100 #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
101 #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
102 #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
103 #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
104 #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
105
106 #define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
107 #define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
108
109 #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
110 #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
111 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
112 #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
113 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
114 #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
115 #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
116 #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
117
118 /*
119 * Miscellaneous XDR helper functions
120 */
121 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
122 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
123 __be32 *xdr_encode_string(__be32 *p, const char *s);
124 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
125 unsigned int maxlen);
126 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
127 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
128
129 void xdr_inline_pages(struct xdr_buf *, unsigned int,
130 struct page **, unsigned int, unsigned int);
131 void xdr_terminate_string(struct xdr_buf *, const u32);
132 size_t xdr_buf_pagecount(struct xdr_buf *buf);
133 int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
134 void xdr_free_bvec(struct xdr_buf *buf);
135
xdr_encode_array(__be32 * p,const void * s,unsigned int len)136 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
137 {
138 return xdr_encode_opaque(p, s, len);
139 }
140
141 /*
142 * Decode 64bit quantities (NFSv3 support)
143 */
144 static inline __be32 *
xdr_encode_hyper(__be32 * p,__u64 val)145 xdr_encode_hyper(__be32 *p, __u64 val)
146 {
147 put_unaligned_be64(val, p);
148 return p + 2;
149 }
150
151 static inline __be32 *
xdr_decode_hyper(__be32 * p,__u64 * valp)152 xdr_decode_hyper(__be32 *p, __u64 *valp)
153 {
154 *valp = get_unaligned_be64(p);
155 return p + 2;
156 }
157
158 static inline __be32 *
xdr_decode_opaque_fixed(__be32 * p,void * ptr,unsigned int len)159 xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
160 {
161 memcpy(ptr, p, len);
162 return p + XDR_QUADLEN(len);
163 }
164
xdr_netobj_dup(struct xdr_netobj * dst,struct xdr_netobj * src,gfp_t gfp_mask)165 static inline void xdr_netobj_dup(struct xdr_netobj *dst,
166 struct xdr_netobj *src, gfp_t gfp_mask)
167 {
168 dst->data = kmemdup(src->data, src->len, gfp_mask);
169 dst->len = src->len;
170 }
171
172 /*
173 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
174 */
175 static inline int
xdr_adjust_iovec(struct kvec * iov,__be32 * p)176 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
177 {
178 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
179 }
180
181 /*
182 * XDR buffer helper functions
183 */
184 extern void xdr_shift_buf(struct xdr_buf *, size_t);
185 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
186 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
187 extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
188 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
189 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
190
191 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
192 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
193
194 struct xdr_array2_desc;
195 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
196 struct xdr_array2_desc {
197 unsigned int elem_size;
198 unsigned int array_len;
199 unsigned int array_maxlen;
200 xdr_xcode_elem_t xcode;
201 };
202
203 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
204 struct xdr_array2_desc *desc);
205 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
206 struct xdr_array2_desc *desc);
207 extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
208 size_t len);
209
210 /*
211 * Provide some simple tools for XDR buffer overflow-checking etc.
212 */
213 struct xdr_stream {
214 __be32 *p; /* start of available buffer */
215 struct xdr_buf *buf; /* XDR buffer to read/write */
216
217 __be32 *end; /* end of available buffer space */
218 struct kvec *iov; /* pointer to the current kvec */
219 struct kvec scratch; /* Scratch buffer */
220 struct page **page_ptr; /* pointer to the current page */
221 unsigned int nwords; /* Remaining decode buffer length */
222
223 struct rpc_rqst *rqst; /* For debugging */
224 };
225
226 /*
227 * These are the xdr_stream style generic XDR encode and decode functions.
228 */
229 typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
230 const void *obj);
231 typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
232 void *obj);
233
234 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
235 __be32 *p, struct rpc_rqst *rqst);
236 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
237 extern int xdr_reserve_space_vec(struct xdr_stream *xdr, struct kvec *vec,
238 size_t nbytes);
239 extern void xdr_commit_encode(struct xdr_stream *xdr);
240 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
241 extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
242 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
243 unsigned int base, unsigned int len);
244 extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
245 extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);
246 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
247 __be32 *p, struct rpc_rqst *rqst);
248 extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
249 struct page **pages, unsigned int len);
250 extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
251 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
252 extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
253 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
254 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
255 extern uint64_t xdr_align_data(struct xdr_stream *, uint64_t, uint32_t);
256 extern uint64_t xdr_expand_hole(struct xdr_stream *, uint64_t, uint64_t);
257
258 /**
259 * xdr_stream_remaining - Return the number of bytes remaining in the stream
260 * @xdr: pointer to struct xdr_stream
261 *
262 * Return value:
263 * Number of bytes remaining in @xdr before xdr->end
264 */
265 static inline size_t
xdr_stream_remaining(const struct xdr_stream * xdr)266 xdr_stream_remaining(const struct xdr_stream *xdr)
267 {
268 return xdr->nwords << 2;
269 }
270
271 ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
272 size_t size);
273 ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
274 size_t maxlen, gfp_t gfp_flags);
275 ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
276 size_t size);
277 ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
278 size_t maxlen, gfp_t gfp_flags);
279 /**
280 * xdr_align_size - Calculate padded size of an object
281 * @n: Size of an object being XDR encoded (in bytes)
282 *
283 * Return value:
284 * Size (in bytes) of the object including xdr padding
285 */
286 static inline size_t
xdr_align_size(size_t n)287 xdr_align_size(size_t n)
288 {
289 const size_t mask = sizeof(__u32) - 1;
290
291 return (n + mask) & ~mask;
292 }
293
294 /**
295 * xdr_pad_size - Calculate size of an object's pad
296 * @n: Size of an object being XDR encoded (in bytes)
297 *
298 * This implementation avoids the need for conditional
299 * branches or modulo division.
300 *
301 * Return value:
302 * Size (in bytes) of the needed XDR pad
303 */
xdr_pad_size(size_t n)304 static inline size_t xdr_pad_size(size_t n)
305 {
306 return xdr_align_size(n) - n;
307 }
308
309 /**
310 * xdr_stream_encode_item_present - Encode a "present" list item
311 * @xdr: pointer to xdr_stream
312 *
313 * Return values:
314 * On success, returns length in bytes of XDR buffer consumed
315 * %-EMSGSIZE on XDR buffer overflow
316 */
xdr_stream_encode_item_present(struct xdr_stream * xdr)317 static inline ssize_t xdr_stream_encode_item_present(struct xdr_stream *xdr)
318 {
319 const size_t len = sizeof(__be32);
320 __be32 *p = xdr_reserve_space(xdr, len);
321
322 if (unlikely(!p))
323 return -EMSGSIZE;
324 *p = xdr_one;
325 return len;
326 }
327
328 /**
329 * xdr_stream_encode_item_absent - Encode a "not present" list item
330 * @xdr: pointer to xdr_stream
331 *
332 * Return values:
333 * On success, returns length in bytes of XDR buffer consumed
334 * %-EMSGSIZE on XDR buffer overflow
335 */
xdr_stream_encode_item_absent(struct xdr_stream * xdr)336 static inline int xdr_stream_encode_item_absent(struct xdr_stream *xdr)
337 {
338 const size_t len = sizeof(__be32);
339 __be32 *p = xdr_reserve_space(xdr, len);
340
341 if (unlikely(!p))
342 return -EMSGSIZE;
343 *p = xdr_zero;
344 return len;
345 }
346
347 /**
348 * xdr_stream_encode_u32 - Encode a 32-bit integer
349 * @xdr: pointer to xdr_stream
350 * @n: integer to encode
351 *
352 * Return values:
353 * On success, returns length in bytes of XDR buffer consumed
354 * %-EMSGSIZE on XDR buffer overflow
355 */
356 static inline ssize_t
xdr_stream_encode_u32(struct xdr_stream * xdr,__u32 n)357 xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
358 {
359 const size_t len = sizeof(n);
360 __be32 *p = xdr_reserve_space(xdr, len);
361
362 if (unlikely(!p))
363 return -EMSGSIZE;
364 *p = cpu_to_be32(n);
365 return len;
366 }
367
368 /**
369 * xdr_stream_encode_u64 - Encode a 64-bit integer
370 * @xdr: pointer to xdr_stream
371 * @n: 64-bit integer to encode
372 *
373 * Return values:
374 * On success, returns length in bytes of XDR buffer consumed
375 * %-EMSGSIZE on XDR buffer overflow
376 */
377 static inline ssize_t
xdr_stream_encode_u64(struct xdr_stream * xdr,__u64 n)378 xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
379 {
380 const size_t len = sizeof(n);
381 __be32 *p = xdr_reserve_space(xdr, len);
382
383 if (unlikely(!p))
384 return -EMSGSIZE;
385 xdr_encode_hyper(p, n);
386 return len;
387 }
388
389 /**
390 * xdr_stream_encode_opaque_inline - Encode opaque xdr data
391 * @xdr: pointer to xdr_stream
392 * @ptr: pointer to void pointer
393 * @len: size of object
394 *
395 * Return values:
396 * On success, returns length in bytes of XDR buffer consumed
397 * %-EMSGSIZE on XDR buffer overflow
398 */
399 static inline ssize_t
xdr_stream_encode_opaque_inline(struct xdr_stream * xdr,void ** ptr,size_t len)400 xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
401 {
402 size_t count = sizeof(__u32) + xdr_align_size(len);
403 __be32 *p = xdr_reserve_space(xdr, count);
404
405 if (unlikely(!p)) {
406 *ptr = NULL;
407 return -EMSGSIZE;
408 }
409 xdr_encode_opaque(p, NULL, len);
410 *ptr = ++p;
411 return count;
412 }
413
414 /**
415 * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
416 * @xdr: pointer to xdr_stream
417 * @ptr: pointer to opaque data object
418 * @len: size of object pointed to by @ptr
419 *
420 * Return values:
421 * On success, returns length in bytes of XDR buffer consumed
422 * %-EMSGSIZE on XDR buffer overflow
423 */
424 static inline ssize_t
xdr_stream_encode_opaque_fixed(struct xdr_stream * xdr,const void * ptr,size_t len)425 xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
426 {
427 __be32 *p = xdr_reserve_space(xdr, len);
428
429 if (unlikely(!p))
430 return -EMSGSIZE;
431 xdr_encode_opaque_fixed(p, ptr, len);
432 return xdr_align_size(len);
433 }
434
435 /**
436 * xdr_stream_encode_opaque - Encode variable length opaque xdr data
437 * @xdr: pointer to xdr_stream
438 * @ptr: pointer to opaque data object
439 * @len: size of object pointed to by @ptr
440 *
441 * Return values:
442 * On success, returns length in bytes of XDR buffer consumed
443 * %-EMSGSIZE on XDR buffer overflow
444 */
445 static inline ssize_t
xdr_stream_encode_opaque(struct xdr_stream * xdr,const void * ptr,size_t len)446 xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
447 {
448 size_t count = sizeof(__u32) + xdr_align_size(len);
449 __be32 *p = xdr_reserve_space(xdr, count);
450
451 if (unlikely(!p))
452 return -EMSGSIZE;
453 xdr_encode_opaque(p, ptr, len);
454 return count;
455 }
456
457 /**
458 * xdr_stream_encode_uint32_array - Encode variable length array of integers
459 * @xdr: pointer to xdr_stream
460 * @array: array of integers
461 * @array_size: number of elements in @array
462 *
463 * Return values:
464 * On success, returns length in bytes of XDR buffer consumed
465 * %-EMSGSIZE on XDR buffer overflow
466 */
467 static inline ssize_t
xdr_stream_encode_uint32_array(struct xdr_stream * xdr,const __u32 * array,size_t array_size)468 xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
469 const __u32 *array, size_t array_size)
470 {
471 ssize_t ret = (array_size+1) * sizeof(__u32);
472 __be32 *p = xdr_reserve_space(xdr, ret);
473
474 if (unlikely(!p))
475 return -EMSGSIZE;
476 *p++ = cpu_to_be32(array_size);
477 for (; array_size > 0; p++, array++, array_size--)
478 *p = cpu_to_be32p(array);
479 return ret;
480 }
481
482 /**
483 * xdr_item_is_absent - symbolically handle XDR discriminators
484 * @p: pointer to undecoded discriminator
485 *
486 * Return values:
487 * %true if the following XDR item is absent
488 * %false if the following XDR item is present
489 */
xdr_item_is_absent(const __be32 * p)490 static inline bool xdr_item_is_absent(const __be32 *p)
491 {
492 return *p == xdr_zero;
493 }
494
495 /**
496 * xdr_item_is_present - symbolically handle XDR discriminators
497 * @p: pointer to undecoded discriminator
498 *
499 * Return values:
500 * %true if the following XDR item is present
501 * %false if the following XDR item is absent
502 */
xdr_item_is_present(const __be32 * p)503 static inline bool xdr_item_is_present(const __be32 *p)
504 {
505 return *p != xdr_zero;
506 }
507
508 /**
509 * xdr_stream_decode_u32 - Decode a 32-bit integer
510 * @xdr: pointer to xdr_stream
511 * @ptr: location to store integer
512 *
513 * Return values:
514 * %0 on success
515 * %-EBADMSG on XDR buffer overflow
516 */
517 static inline ssize_t
xdr_stream_decode_u32(struct xdr_stream * xdr,__u32 * ptr)518 xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
519 {
520 const size_t count = sizeof(*ptr);
521 __be32 *p = xdr_inline_decode(xdr, count);
522
523 if (unlikely(!p))
524 return -EBADMSG;
525 *ptr = be32_to_cpup(p);
526 return 0;
527 }
528
529 /**
530 * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
531 * @xdr: pointer to xdr_stream
532 * @ptr: location to store data
533 * @len: size of buffer pointed to by @ptr
534 *
535 * Return values:
536 * On success, returns size of object stored in @ptr
537 * %-EBADMSG on XDR buffer overflow
538 */
539 static inline ssize_t
xdr_stream_decode_opaque_fixed(struct xdr_stream * xdr,void * ptr,size_t len)540 xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
541 {
542 __be32 *p = xdr_inline_decode(xdr, len);
543
544 if (unlikely(!p))
545 return -EBADMSG;
546 xdr_decode_opaque_fixed(p, ptr, len);
547 return len;
548 }
549
550 /**
551 * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
552 * @xdr: pointer to xdr_stream
553 * @ptr: location to store pointer to opaque data
554 * @maxlen: maximum acceptable object size
555 *
556 * Note: the pointer stored in @ptr cannot be assumed valid after the XDR
557 * buffer has been destroyed, or even after calling xdr_inline_decode()
558 * on @xdr. It is therefore expected that the object it points to should
559 * be processed immediately.
560 *
561 * Return values:
562 * On success, returns size of object stored in *@ptr
563 * %-EBADMSG on XDR buffer overflow
564 * %-EMSGSIZE if the size of the object would exceed @maxlen
565 */
566 static inline ssize_t
xdr_stream_decode_opaque_inline(struct xdr_stream * xdr,void ** ptr,size_t maxlen)567 xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
568 {
569 __be32 *p;
570 __u32 len;
571
572 *ptr = NULL;
573 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
574 return -EBADMSG;
575 if (len != 0) {
576 p = xdr_inline_decode(xdr, len);
577 if (unlikely(!p))
578 return -EBADMSG;
579 if (unlikely(len > maxlen))
580 return -EMSGSIZE;
581 *ptr = p;
582 }
583 return len;
584 }
585
586 /**
587 * xdr_stream_decode_uint32_array - Decode variable length array of integers
588 * @xdr: pointer to xdr_stream
589 * @array: location to store the integer array or NULL
590 * @array_size: number of elements to store
591 *
592 * Return values:
593 * On success, returns number of elements stored in @array
594 * %-EBADMSG on XDR buffer overflow
595 * %-EMSGSIZE if the size of the array exceeds @array_size
596 */
597 static inline ssize_t
xdr_stream_decode_uint32_array(struct xdr_stream * xdr,__u32 * array,size_t array_size)598 xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
599 __u32 *array, size_t array_size)
600 {
601 __be32 *p;
602 __u32 len;
603 ssize_t retval;
604
605 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
606 return -EBADMSG;
607 p = xdr_inline_decode(xdr, len * sizeof(*p));
608 if (unlikely(!p))
609 return -EBADMSG;
610 if (array == NULL)
611 return len;
612 if (len <= array_size) {
613 if (len < array_size)
614 memset(array+len, 0, (array_size-len)*sizeof(*array));
615 array_size = len;
616 retval = len;
617 } else
618 retval = -EMSGSIZE;
619 for (; array_size > 0; p++, array++, array_size--)
620 *array = be32_to_cpup(p);
621 return retval;
622 }
623
624 #endif /* _SUNRPC_XDR_H_ */
625
