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git.ipfire.org Git - thirdparty/linux.git/blob - include/linux/sunrpc/xdr.h
1 /* SPDX-License-Identifier: GPL-2.0 */
3 * XDR standard data types and function declarations
5 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
8 * RFC 4506 "XDR: External Data Representation Standard", May 2006
11 #ifndef _SUNRPC_XDR_H_
12 #define _SUNRPC_XDR_H_
14 #include <linux/uio.h>
15 #include <asm/byteorder.h>
16 #include <asm/unaligned.h>
17 #include <linux/scatterlist.h>
25 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
28 * Generic opaque `network object.' At the kernel level, this type
29 * is used only by lockd.
31 #define XDR_MAX_NETOBJ 1024
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
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.
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.
51 struct kvec head
[1], /* RPC header + non-page data */
52 tail
[1]; /* Appended after page data */
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 */
63 unsigned int buflen
, /* Total length of storage buffer */
64 len
; /* Length of XDR encoded message */
68 xdr_buf_init(struct xdr_buf
*buf
, void *start
, size_t len
)
70 buf
->head
[0].iov_base
= start
;
71 buf
->head
[0].iov_len
= len
;
72 buf
->tail
[0].iov_len
= 0;
84 #define xdr_zero cpu_to_be32(0)
85 #define xdr_one cpu_to_be32(1)
86 #define xdr_two cpu_to_be32(2)
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)
93 #define rpc_call cpu_to_be32(RPC_CALL)
94 #define rpc_reply cpu_to_be32(RPC_REPLY)
96 #define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
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)
106 #define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
107 #define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
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)
119 * Miscellaneous XDR helper functions
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
*);
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
);
136 static inline __be32
*xdr_encode_array(__be32
*p
, const void *s
, unsigned int len
)
138 return xdr_encode_opaque(p
, s
, len
);
142 * Decode 64bit quantities (NFSv3 support)
144 static inline __be32
*
145 xdr_encode_hyper(__be32
*p
, __u64 val
)
147 put_unaligned_be64(val
, p
);
151 static inline __be32
*
152 xdr_decode_hyper(__be32
*p
, __u64
*valp
)
154 *valp
= get_unaligned_be64(p
);
158 static inline __be32
*
159 xdr_decode_opaque_fixed(__be32
*p
, void *ptr
, unsigned int len
)
162 return p
+ XDR_QUADLEN(len
);
165 static inline void xdr_netobj_dup(struct xdr_netobj
*dst
,
166 struct xdr_netobj
*src
, gfp_t gfp_mask
)
168 dst
->data
= kmemdup(src
->data
, src
->len
, gfp_mask
);
173 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
176 xdr_adjust_iovec(struct kvec
*iov
, __be32
*p
)
178 return iov
->iov_len
= ((u8
*) p
- (u8
*) iov
->iov_base
);
182 * XDR buffer helper functions
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 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);
190 extern int xdr_encode_word(struct xdr_buf
*, unsigned int, u32
);
191 extern int xdr_decode_word(struct xdr_buf
*, unsigned int, u32
*);
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
;
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
,
210 * Provide some simple tools for XDR buffer overflow-checking etc.
213 __be32
*p
; /* start of available buffer */
214 struct xdr_buf
*buf
; /* XDR buffer to read/write */
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 */
222 struct rpc_rqst
*rqst
; /* For debugging */
226 * These are the xdr_stream style generic XDR encode and decode functions.
228 typedef void (*kxdreproc_t
)(struct rpc_rqst
*rqstp
, struct xdr_stream
*xdr
,
230 typedef int (*kxdrdproc_t
)(struct rpc_rqst
*rqstp
, struct xdr_stream
*xdr
,
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 void xdr_commit_encode(struct xdr_stream
*xdr
);
237 extern void xdr_truncate_encode(struct xdr_stream
*xdr
, size_t len
);
238 extern int xdr_restrict_buflen(struct xdr_stream
*xdr
, int newbuflen
);
239 extern void xdr_write_pages(struct xdr_stream
*xdr
, struct page
**pages
,
240 unsigned int base
, unsigned int len
);
241 extern unsigned int xdr_stream_pos(const struct xdr_stream
*xdr
);
242 extern void xdr_init_decode(struct xdr_stream
*xdr
, struct xdr_buf
*buf
,
243 __be32
*p
, struct rpc_rqst
*rqst
);
244 extern void xdr_init_decode_pages(struct xdr_stream
*xdr
, struct xdr_buf
*buf
,
245 struct page
**pages
, unsigned int len
);
246 extern void xdr_set_scratch_buffer(struct xdr_stream
*xdr
, void *buf
, size_t buflen
);
247 extern __be32
*xdr_inline_decode(struct xdr_stream
*xdr
, size_t nbytes
);
248 extern unsigned int xdr_read_pages(struct xdr_stream
*xdr
, unsigned int len
);
249 extern void xdr_enter_page(struct xdr_stream
*xdr
, unsigned int len
);
250 extern int xdr_process_buf(struct xdr_buf
*buf
, unsigned int offset
, unsigned int len
, int (*actor
)(struct scatterlist
*, void *), void *data
);
253 * xdr_stream_remaining - Return the number of bytes remaining in the stream
254 * @xdr: pointer to struct xdr_stream
257 * Number of bytes remaining in @xdr before xdr->end
260 xdr_stream_remaining(const struct xdr_stream
*xdr
)
262 return xdr
->nwords
<< 2;
265 ssize_t
xdr_stream_decode_opaque(struct xdr_stream
*xdr
, void *ptr
,
267 ssize_t
xdr_stream_decode_opaque_dup(struct xdr_stream
*xdr
, void **ptr
,
268 size_t maxlen
, gfp_t gfp_flags
);
269 ssize_t
xdr_stream_decode_string(struct xdr_stream
*xdr
, char *str
,
271 ssize_t
xdr_stream_decode_string_dup(struct xdr_stream
*xdr
, char **str
,
272 size_t maxlen
, gfp_t gfp_flags
);
274 * xdr_align_size - Calculate padded size of an object
275 * @n: Size of an object being XDR encoded (in bytes)
278 * Size (in bytes) of the object including xdr padding
281 xdr_align_size(size_t n
)
283 const size_t mask
= sizeof(__u32
) - 1;
285 return (n
+ mask
) & ~mask
;
289 * xdr_pad_size - Calculate size of an object's pad
290 * @n: Size of an object being XDR encoded (in bytes)
292 * This implementation avoids the need for conditional
293 * branches or modulo division.
296 * Size (in bytes) of the needed XDR pad
298 static inline size_t xdr_pad_size(size_t n
)
300 return xdr_align_size(n
) - n
;
304 * xdr_stream_encode_item_present - Encode a "present" list item
305 * @xdr: pointer to xdr_stream
308 * On success, returns length in bytes of XDR buffer consumed
309 * %-EMSGSIZE on XDR buffer overflow
311 static inline ssize_t
xdr_stream_encode_item_present(struct xdr_stream
*xdr
)
313 const size_t len
= sizeof(__be32
);
314 __be32
*p
= xdr_reserve_space(xdr
, len
);
323 * xdr_stream_encode_item_absent - Encode a "not present" list item
324 * @xdr: pointer to xdr_stream
327 * On success, returns length in bytes of XDR buffer consumed
328 * %-EMSGSIZE on XDR buffer overflow
330 static inline int xdr_stream_encode_item_absent(struct xdr_stream
*xdr
)
332 const size_t len
= sizeof(__be32
);
333 __be32
*p
= xdr_reserve_space(xdr
, len
);
342 * xdr_stream_encode_u32 - Encode a 32-bit integer
343 * @xdr: pointer to xdr_stream
344 * @n: integer to encode
347 * On success, returns length in bytes of XDR buffer consumed
348 * %-EMSGSIZE on XDR buffer overflow
350 static inline ssize_t
351 xdr_stream_encode_u32(struct xdr_stream
*xdr
, __u32 n
)
353 const size_t len
= sizeof(n
);
354 __be32
*p
= xdr_reserve_space(xdr
, len
);
363 * xdr_stream_encode_u64 - Encode a 64-bit integer
364 * @xdr: pointer to xdr_stream
365 * @n: 64-bit integer to encode
368 * On success, returns length in bytes of XDR buffer consumed
369 * %-EMSGSIZE on XDR buffer overflow
371 static inline ssize_t
372 xdr_stream_encode_u64(struct xdr_stream
*xdr
, __u64 n
)
374 const size_t len
= sizeof(n
);
375 __be32
*p
= xdr_reserve_space(xdr
, len
);
379 xdr_encode_hyper(p
, n
);
384 * xdr_stream_encode_opaque_inline - Encode opaque xdr data
385 * @xdr: pointer to xdr_stream
386 * @ptr: pointer to void pointer
387 * @len: size of object
390 * On success, returns length in bytes of XDR buffer consumed
391 * %-EMSGSIZE on XDR buffer overflow
393 static inline ssize_t
394 xdr_stream_encode_opaque_inline(struct xdr_stream
*xdr
, void **ptr
, size_t len
)
396 size_t count
= sizeof(__u32
) + xdr_align_size(len
);
397 __be32
*p
= xdr_reserve_space(xdr
, count
);
403 xdr_encode_opaque(p
, NULL
, len
);
409 * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
410 * @xdr: pointer to xdr_stream
411 * @ptr: pointer to opaque data object
412 * @len: size of object pointed to by @ptr
415 * On success, returns length in bytes of XDR buffer consumed
416 * %-EMSGSIZE on XDR buffer overflow
418 static inline ssize_t
419 xdr_stream_encode_opaque_fixed(struct xdr_stream
*xdr
, const void *ptr
, size_t len
)
421 __be32
*p
= xdr_reserve_space(xdr
, len
);
425 xdr_encode_opaque_fixed(p
, ptr
, len
);
426 return xdr_align_size(len
);
430 * xdr_stream_encode_opaque - Encode variable length opaque xdr data
431 * @xdr: pointer to xdr_stream
432 * @ptr: pointer to opaque data object
433 * @len: size of object pointed to by @ptr
436 * On success, returns length in bytes of XDR buffer consumed
437 * %-EMSGSIZE on XDR buffer overflow
439 static inline ssize_t
440 xdr_stream_encode_opaque(struct xdr_stream
*xdr
, const void *ptr
, size_t len
)
442 size_t count
= sizeof(__u32
) + xdr_align_size(len
);
443 __be32
*p
= xdr_reserve_space(xdr
, count
);
447 xdr_encode_opaque(p
, ptr
, len
);
452 * xdr_stream_encode_uint32_array - Encode variable length array of integers
453 * @xdr: pointer to xdr_stream
454 * @array: array of integers
455 * @array_size: number of elements in @array
458 * On success, returns length in bytes of XDR buffer consumed
459 * %-EMSGSIZE on XDR buffer overflow
461 static inline ssize_t
462 xdr_stream_encode_uint32_array(struct xdr_stream
*xdr
,
463 const __u32
*array
, size_t array_size
)
465 ssize_t ret
= (array_size
+1) * sizeof(__u32
);
466 __be32
*p
= xdr_reserve_space(xdr
, ret
);
470 *p
++ = cpu_to_be32(array_size
);
471 for (; array_size
> 0; p
++, array
++, array_size
--)
472 *p
= cpu_to_be32p(array
);
477 * xdr_stream_decode_u32 - Decode a 32-bit integer
478 * @xdr: pointer to xdr_stream
479 * @ptr: location to store integer
483 * %-EBADMSG on XDR buffer overflow
485 static inline ssize_t
486 xdr_stream_decode_u32(struct xdr_stream
*xdr
, __u32
*ptr
)
488 const size_t count
= sizeof(*ptr
);
489 __be32
*p
= xdr_inline_decode(xdr
, count
);
493 *ptr
= be32_to_cpup(p
);
498 * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
499 * @xdr: pointer to xdr_stream
500 * @ptr: location to store data
501 * @len: size of buffer pointed to by @ptr
504 * On success, returns size of object stored in @ptr
505 * %-EBADMSG on XDR buffer overflow
507 static inline ssize_t
508 xdr_stream_decode_opaque_fixed(struct xdr_stream
*xdr
, void *ptr
, size_t len
)
510 __be32
*p
= xdr_inline_decode(xdr
, len
);
514 xdr_decode_opaque_fixed(p
, ptr
, len
);
519 * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
520 * @xdr: pointer to xdr_stream
521 * @ptr: location to store pointer to opaque data
522 * @maxlen: maximum acceptable object size
524 * Note: the pointer stored in @ptr cannot be assumed valid after the XDR
525 * buffer has been destroyed, or even after calling xdr_inline_decode()
526 * on @xdr. It is therefore expected that the object it points to should
527 * be processed immediately.
530 * On success, returns size of object stored in *@ptr
531 * %-EBADMSG on XDR buffer overflow
532 * %-EMSGSIZE if the size of the object would exceed @maxlen
534 static inline ssize_t
535 xdr_stream_decode_opaque_inline(struct xdr_stream
*xdr
, void **ptr
, size_t maxlen
)
541 if (unlikely(xdr_stream_decode_u32(xdr
, &len
) < 0))
544 p
= xdr_inline_decode(xdr
, len
);
547 if (unlikely(len
> maxlen
))
555 * xdr_stream_decode_uint32_array - Decode variable length array of integers
556 * @xdr: pointer to xdr_stream
557 * @array: location to store the integer array or NULL
558 * @array_size: number of elements to store
561 * On success, returns number of elements stored in @array
562 * %-EBADMSG on XDR buffer overflow
563 * %-EMSGSIZE if the size of the array exceeds @array_size
565 static inline ssize_t
566 xdr_stream_decode_uint32_array(struct xdr_stream
*xdr
,
567 __u32
*array
, size_t array_size
)
573 if (unlikely(xdr_stream_decode_u32(xdr
, &len
) < 0))
575 p
= xdr_inline_decode(xdr
, len
* sizeof(*p
));
580 if (len
<= array_size
) {
581 if (len
< array_size
)
582 memset(array
+len
, 0, (array_size
-len
)*sizeof(*array
));
587 for (; array_size
> 0; p
++, array
++, array_size
--)
588 *array
= be32_to_cpup(p
);
592 #endif /* _SUNRPC_XDR_H_ */