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