]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
9605a069 | 3 | * XDR standard data types and function declarations |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de> | |
9605a069 CL |
6 | * |
7 | * Based on: | |
8 | * RFC 4506 "XDR: External Data Representation Standard", May 2006 | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #ifndef _SUNRPC_XDR_H_ | |
12 | #define _SUNRPC_XDR_H_ | |
13 | ||
14 | #ifdef __KERNEL__ | |
15 | ||
16 | #include <linux/uio.h> | |
17 | #include <asm/byteorder.h> | |
97363c6a | 18 | #include <asm/unaligned.h> |
37a4e6cb | 19 | #include <linux/scatterlist.h> |
1da177e4 | 20 | |
9d96acbc | 21 | struct bio_vec; |
c512f36b CH |
22 | struct rpc_rqst; |
23 | ||
1da177e4 LT |
24 | /* |
25 | * Buffer adjustment | |
26 | */ | |
27 | #define XDR_QUADLEN(l) (((l) + 3) >> 2) | |
28 | ||
29 | /* | |
30 | * Generic opaque `network object.' At the kernel level, this type | |
31 | * is used only by lockd. | |
32 | */ | |
33 | #define XDR_MAX_NETOBJ 1024 | |
34 | struct xdr_netobj { | |
35 | unsigned int len; | |
36 | u8 * data; | |
37 | }; | |
38 | ||
1da177e4 LT |
39 | /* |
40 | * Basic structure for transmission/reception of a client XDR message. | |
41 | * Features a header (for a linear buffer containing RPC headers | |
42 | * and the data payload for short messages), and then an array of | |
43 | * pages. | |
44 | * The tail iovec allows you to append data after the page array. Its | |
45 | * main interest is for appending padding to the pages in order to | |
46 | * satisfy the int_32-alignment requirements in RFC1832. | |
47 | * | |
48 | * For the future, we might want to string several of these together | |
49 | * in a list if anybody wants to make use of NFSv4 COMPOUND | |
50 | * operations and/or has a need for scatter/gather involving pages. | |
51 | */ | |
52 | struct xdr_buf { | |
53 | struct kvec head[1], /* RPC header + non-page data */ | |
54 | tail[1]; /* Appended after page data */ | |
55 | ||
9d96acbc | 56 | struct bio_vec *bvec; |
de0b65ca | 57 | struct page ** pages; /* Array of pages */ |
1da177e4 | 58 | unsigned int page_base, /* Start of page data */ |
4f22ccc3 TT |
59 | page_len, /* Length of page data */ |
60 | flags; /* Flags for data disposition */ | |
61 | #define XDRBUF_READ 0x01 /* target of file read */ | |
62 | #define XDRBUF_WRITE 0x02 /* source of file write */ | |
431f6eb3 | 63 | #define XDRBUF_SPARSE_PAGES 0x04 /* Page array is sparse */ |
1da177e4 LT |
64 | |
65 | unsigned int buflen, /* Total length of storage buffer */ | |
66 | len; /* Length of XDR encoded message */ | |
1da177e4 LT |
67 | }; |
68 | ||
b9c5bc03 CL |
69 | static inline void |
70 | xdr_buf_init(struct xdr_buf *buf, void *start, size_t len) | |
71 | { | |
72 | buf->head[0].iov_base = start; | |
73 | buf->head[0].iov_len = len; | |
74 | buf->tail[0].iov_len = 0; | |
9d96acbc | 75 | buf->pages = NULL; |
b9c5bc03 CL |
76 | buf->page_len = 0; |
77 | buf->flags = 0; | |
78 | buf->len = 0; | |
79 | buf->buflen = len; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * pre-xdr'ed macros. | |
84 | */ | |
85 | ||
77f18f5e HH |
86 | #define xdr_zero cpu_to_be32(0) |
87 | #define xdr_one cpu_to_be32(1) | |
88 | #define xdr_two cpu_to_be32(2) | |
89 | ||
90 | #define rpc_success cpu_to_be32(RPC_SUCCESS) | |
91 | #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL) | |
92 | #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH) | |
93 | #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL) | |
94 | #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS) | |
95 | #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR) | |
96 | #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY) | |
97 | ||
98 | #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK) | |
99 | #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED) | |
100 | #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED) | |
101 | #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF) | |
102 | #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF) | |
103 | #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK) | |
104 | #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM) | |
105 | #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM) | |
106 | #define rpc_autherr_oldseqnum cpu_to_be32(101) | |
1da177e4 LT |
107 | |
108 | /* | |
109 | * Miscellaneous XDR helper functions | |
110 | */ | |
d8ed029d AD |
111 | __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len); |
112 | __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len); | |
113 | __be32 *xdr_encode_string(__be32 *p, const char *s); | |
e5cff482 CL |
114 | __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp, |
115 | unsigned int maxlen); | |
d8ed029d AD |
116 | __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *); |
117 | __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *); | |
1da177e4 | 118 | |
1da177e4 LT |
119 | void xdr_inline_pages(struct xdr_buf *, unsigned int, |
120 | struct page **, unsigned int, unsigned int); | |
b4687da7 | 121 | void xdr_terminate_string(struct xdr_buf *, const u32); |
9d96acbc TM |
122 | size_t xdr_buf_pagecount(struct xdr_buf *buf); |
123 | int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp); | |
124 | void xdr_free_bvec(struct xdr_buf *buf); | |
1da177e4 | 125 | |
d8ed029d | 126 | static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len) |
1da177e4 LT |
127 | { |
128 | return xdr_encode_opaque(p, s, len); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Decode 64bit quantities (NFSv3 support) | |
133 | */ | |
d8ed029d AD |
134 | static inline __be32 * |
135 | xdr_encode_hyper(__be32 *p, __u64 val) | |
1da177e4 | 136 | { |
97363c6a | 137 | put_unaligned_be64(val, p); |
9f162d2a | 138 | return p + 2; |
1da177e4 LT |
139 | } |
140 | ||
d8ed029d AD |
141 | static inline __be32 * |
142 | xdr_decode_hyper(__be32 *p, __u64 *valp) | |
1da177e4 | 143 | { |
97363c6a | 144 | *valp = get_unaligned_be64(p); |
98866b5a | 145 | return p + 2; |
1da177e4 LT |
146 | } |
147 | ||
35b61e63 BH |
148 | static inline __be32 * |
149 | xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len) | |
150 | { | |
151 | memcpy(ptr, p, len); | |
152 | return p + XDR_QUADLEN(len); | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Adjust kvec to reflect end of xdr'ed data (RPC client XDR) | |
157 | */ | |
158 | static inline int | |
d8ed029d | 159 | xdr_adjust_iovec(struct kvec *iov, __be32 *p) |
1da177e4 LT |
160 | { |
161 | return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base); | |
162 | } | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * XDR buffer helper functions | |
166 | */ | |
167 | extern void xdr_shift_buf(struct xdr_buf *, size_t); | |
168 | extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *); | |
1e78957e | 169 | extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int); |
4c190e2f | 170 | extern void xdr_buf_trim(struct xdr_buf *, unsigned int); |
1e78957e TM |
171 | extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int); |
172 | extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int); | |
173 | extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int); | |
1da177e4 LT |
174 | |
175 | /* | |
176 | * Helper structure for copying from an sk_buff. | |
177 | */ | |
dd456471 | 178 | struct xdr_skb_reader { |
1da177e4 LT |
179 | struct sk_buff *skb; |
180 | unsigned int offset; | |
181 | size_t count; | |
44bb9363 | 182 | __wsum csum; |
dd456471 | 183 | }; |
1da177e4 | 184 | |
dd456471 | 185 | typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len); |
1da177e4 | 186 | |
094bb20b | 187 | extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *); |
1da177e4 | 188 | |
1e78957e TM |
189 | extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32); |
190 | extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *); | |
bd8100e7 AG |
191 | |
192 | struct xdr_array2_desc; | |
193 | typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem); | |
194 | struct xdr_array2_desc { | |
195 | unsigned int elem_size; | |
196 | unsigned int array_len; | |
58fcb8df | 197 | unsigned int array_maxlen; |
bd8100e7 AG |
198 | xdr_xcode_elem_t xcode; |
199 | }; | |
200 | ||
201 | extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base, | |
9605a069 | 202 | struct xdr_array2_desc *desc); |
bd8100e7 AG |
203 | extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base, |
204 | struct xdr_array2_desc *desc); | |
bf118a34 AA |
205 | extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase, |
206 | size_t len); | |
bd8100e7 | 207 | |
1da177e4 LT |
208 | /* |
209 | * Provide some simple tools for XDR buffer overflow-checking etc. | |
210 | */ | |
211 | struct xdr_stream { | |
d8ed029d | 212 | __be32 *p; /* start of available buffer */ |
1da177e4 LT |
213 | struct xdr_buf *buf; /* XDR buffer to read/write */ |
214 | ||
d8ed029d | 215 | __be32 *end; /* end of available buffer space */ |
1da177e4 | 216 | struct kvec *iov; /* pointer to the current kvec */ |
6650239a TM |
217 | struct kvec scratch; /* Scratch buffer */ |
218 | struct page **page_ptr; /* pointer to the current page */ | |
bfeea1dc | 219 | unsigned int nwords; /* Remaining decode buffer length */ |
1da177e4 LT |
220 | }; |
221 | ||
9f06c719 | 222 | /* |
bf269551 | 223 | * These are the xdr_stream style generic XDR encode and decode functions. |
9f06c719 | 224 | */ |
c512f36b CH |
225 | typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
226 | const void *obj); | |
73c8dc13 CH |
227 | typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr, |
228 | void *obj); | |
9f06c719 | 229 | |
d8ed029d AD |
230 | extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p); |
231 | extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes); | |
2825a7f9 | 232 | extern void xdr_commit_encode(struct xdr_stream *xdr); |
3e19ce76 | 233 | extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len); |
db3f58a9 | 234 | extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen); |
1da177e4 LT |
235 | extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, |
236 | unsigned int base, unsigned int len); | |
4517d526 | 237 | extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr); |
d8ed029d | 238 | extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p); |
f7da7a12 BH |
239 | extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf, |
240 | struct page **pages, unsigned int len); | |
6650239a | 241 | extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen); |
d8ed029d | 242 | extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes); |
c337d365 | 243 | extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len); |
8b23ea7b | 244 | extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len); |
37a4e6cb | 245 | extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data); |
1da177e4 | 246 | |
41c8f70f CL |
247 | /** |
248 | * xdr_stream_remaining - Return the number of bytes remaining in the stream | |
249 | * @xdr: pointer to struct xdr_stream | |
250 | * | |
251 | * Return value: | |
252 | * Number of bytes remaining in @xdr before xdr->end | |
253 | */ | |
254 | static inline size_t | |
255 | xdr_stream_remaining(const struct xdr_stream *xdr) | |
256 | { | |
257 | return xdr->nwords << 2; | |
258 | } | |
259 | ||
0e779aa7 TM |
260 | ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr, |
261 | size_t size); | |
262 | ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr, | |
263 | size_t maxlen, gfp_t gfp_flags); | |
264 | ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str, | |
265 | size_t size); | |
5c741d4f TM |
266 | ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str, |
267 | size_t maxlen, gfp_t gfp_flags); | |
0ae060ca TM |
268 | /** |
269 | * xdr_align_size - Calculate padded size of an object | |
270 | * @n: Size of an object being XDR encoded (in bytes) | |
271 | * | |
272 | * Return value: | |
273 | * Size (in bytes) of the object including xdr padding | |
274 | */ | |
275 | static inline size_t | |
276 | xdr_align_size(size_t n) | |
277 | { | |
278 | const size_t mask = sizeof(__u32) - 1; | |
279 | ||
280 | return (n + mask) & ~mask; | |
281 | } | |
282 | ||
283 | /** | |
284 | * xdr_stream_encode_u32 - Encode a 32-bit integer | |
285 | * @xdr: pointer to xdr_stream | |
286 | * @n: integer to encode | |
287 | * | |
288 | * Return values: | |
289 | * On success, returns length in bytes of XDR buffer consumed | |
290 | * %-EMSGSIZE on XDR buffer overflow | |
291 | */ | |
292 | static inline ssize_t | |
293 | xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n) | |
294 | { | |
295 | const size_t len = sizeof(n); | |
296 | __be32 *p = xdr_reserve_space(xdr, len); | |
297 | ||
298 | if (unlikely(!p)) | |
299 | return -EMSGSIZE; | |
300 | *p = cpu_to_be32(n); | |
301 | return len; | |
302 | } | |
303 | ||
304 | /** | |
305 | * xdr_stream_encode_u64 - Encode a 64-bit integer | |
306 | * @xdr: pointer to xdr_stream | |
307 | * @n: 64-bit integer to encode | |
308 | * | |
309 | * Return values: | |
310 | * On success, returns length in bytes of XDR buffer consumed | |
311 | * %-EMSGSIZE on XDR buffer overflow | |
312 | */ | |
313 | static inline ssize_t | |
314 | xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n) | |
315 | { | |
316 | const size_t len = sizeof(n); | |
317 | __be32 *p = xdr_reserve_space(xdr, len); | |
318 | ||
319 | if (unlikely(!p)) | |
320 | return -EMSGSIZE; | |
321 | xdr_encode_hyper(p, n); | |
322 | return len; | |
323 | } | |
324 | ||
85e3dd44 TM |
325 | /** |
326 | * xdr_stream_encode_opaque_inline - Encode opaque xdr data | |
327 | * @xdr: pointer to xdr_stream | |
328 | * @ptr: pointer to void pointer | |
329 | * @len: size of object | |
330 | * | |
331 | * Return values: | |
332 | * On success, returns length in bytes of XDR buffer consumed | |
333 | * %-EMSGSIZE on XDR buffer overflow | |
334 | */ | |
335 | static inline ssize_t | |
336 | xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len) | |
337 | { | |
338 | size_t count = sizeof(__u32) + xdr_align_size(len); | |
339 | __be32 *p = xdr_reserve_space(xdr, count); | |
340 | ||
341 | if (unlikely(!p)) { | |
342 | *ptr = NULL; | |
343 | return -EMSGSIZE; | |
344 | } | |
345 | xdr_encode_opaque(p, NULL, len); | |
346 | *ptr = ++p; | |
347 | return count; | |
348 | } | |
349 | ||
0ae060ca TM |
350 | /** |
351 | * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data | |
352 | * @xdr: pointer to xdr_stream | |
353 | * @ptr: pointer to opaque data object | |
354 | * @len: size of object pointed to by @ptr | |
355 | * | |
356 | * Return values: | |
357 | * On success, returns length in bytes of XDR buffer consumed | |
358 | * %-EMSGSIZE on XDR buffer overflow | |
359 | */ | |
360 | static inline ssize_t | |
361 | xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len) | |
362 | { | |
363 | __be32 *p = xdr_reserve_space(xdr, len); | |
364 | ||
365 | if (unlikely(!p)) | |
366 | return -EMSGSIZE; | |
367 | xdr_encode_opaque_fixed(p, ptr, len); | |
368 | return xdr_align_size(len); | |
369 | } | |
370 | ||
371 | /** | |
372 | * xdr_stream_encode_opaque - Encode variable length opaque xdr data | |
373 | * @xdr: pointer to xdr_stream | |
374 | * @ptr: pointer to opaque data object | |
375 | * @len: size of object pointed to by @ptr | |
376 | * | |
377 | * Return values: | |
378 | * On success, returns length in bytes of XDR buffer consumed | |
379 | * %-EMSGSIZE on XDR buffer overflow | |
380 | */ | |
381 | static inline ssize_t | |
382 | xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len) | |
383 | { | |
384 | size_t count = sizeof(__u32) + xdr_align_size(len); | |
385 | __be32 *p = xdr_reserve_space(xdr, count); | |
386 | ||
387 | if (unlikely(!p)) | |
388 | return -EMSGSIZE; | |
389 | xdr_encode_opaque(p, ptr, len); | |
390 | return count; | |
391 | } | |
392 | ||
37c88763 TM |
393 | /** |
394 | * xdr_stream_encode_uint32_array - Encode variable length array of integers | |
395 | * @xdr: pointer to xdr_stream | |
396 | * @array: array of integers | |
397 | * @array_size: number of elements in @array | |
398 | * | |
399 | * Return values: | |
400 | * On success, returns length in bytes of XDR buffer consumed | |
401 | * %-EMSGSIZE on XDR buffer overflow | |
402 | */ | |
403 | static inline ssize_t | |
404 | xdr_stream_encode_uint32_array(struct xdr_stream *xdr, | |
405 | const __u32 *array, size_t array_size) | |
406 | { | |
407 | ssize_t ret = (array_size+1) * sizeof(__u32); | |
408 | __be32 *p = xdr_reserve_space(xdr, ret); | |
409 | ||
410 | if (unlikely(!p)) | |
411 | return -EMSGSIZE; | |
412 | *p++ = cpu_to_be32(array_size); | |
413 | for (; array_size > 0; p++, array++, array_size--) | |
414 | *p = cpu_to_be32p(array); | |
415 | return ret; | |
416 | } | |
417 | ||
0ae060ca TM |
418 | /** |
419 | * xdr_stream_decode_u32 - Decode a 32-bit integer | |
420 | * @xdr: pointer to xdr_stream | |
421 | * @ptr: location to store integer | |
422 | * | |
423 | * Return values: | |
424 | * %0 on success | |
425 | * %-EBADMSG on XDR buffer overflow | |
426 | */ | |
427 | static inline ssize_t | |
428 | xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr) | |
429 | { | |
430 | const size_t count = sizeof(*ptr); | |
431 | __be32 *p = xdr_inline_decode(xdr, count); | |
432 | ||
433 | if (unlikely(!p)) | |
434 | return -EBADMSG; | |
435 | *ptr = be32_to_cpup(p); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | /** | |
440 | * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data | |
441 | * @xdr: pointer to xdr_stream | |
442 | * @ptr: location to store data | |
443 | * @len: size of buffer pointed to by @ptr | |
444 | * | |
445 | * Return values: | |
446 | * On success, returns size of object stored in @ptr | |
447 | * %-EBADMSG on XDR buffer overflow | |
448 | */ | |
449 | static inline ssize_t | |
450 | xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len) | |
451 | { | |
452 | __be32 *p = xdr_inline_decode(xdr, len); | |
453 | ||
454 | if (unlikely(!p)) | |
455 | return -EBADMSG; | |
456 | xdr_decode_opaque_fixed(p, ptr, len); | |
457 | return len; | |
458 | } | |
459 | ||
460 | /** | |
461 | * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data | |
462 | * @xdr: pointer to xdr_stream | |
463 | * @ptr: location to store pointer to opaque data | |
464 | * @maxlen: maximum acceptable object size | |
465 | * | |
466 | * Note: the pointer stored in @ptr cannot be assumed valid after the XDR | |
467 | * buffer has been destroyed, or even after calling xdr_inline_decode() | |
468 | * on @xdr. It is therefore expected that the object it points to should | |
469 | * be processed immediately. | |
470 | * | |
471 | * Return values: | |
472 | * On success, returns size of object stored in *@ptr | |
473 | * %-EBADMSG on XDR buffer overflow | |
474 | * %-EMSGSIZE if the size of the object would exceed @maxlen | |
475 | */ | |
476 | static inline ssize_t | |
477 | xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen) | |
478 | { | |
479 | __be32 *p; | |
480 | __u32 len; | |
481 | ||
482 | *ptr = NULL; | |
483 | if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0)) | |
484 | return -EBADMSG; | |
485 | if (len != 0) { | |
486 | p = xdr_inline_decode(xdr, len); | |
487 | if (unlikely(!p)) | |
488 | return -EBADMSG; | |
489 | if (unlikely(len > maxlen)) | |
490 | return -EMSGSIZE; | |
491 | *ptr = p; | |
492 | } | |
493 | return len; | |
494 | } | |
37c88763 TM |
495 | |
496 | /** | |
497 | * xdr_stream_decode_uint32_array - Decode variable length array of integers | |
498 | * @xdr: pointer to xdr_stream | |
499 | * @array: location to store the integer array or NULL | |
500 | * @array_size: number of elements to store | |
501 | * | |
502 | * Return values: | |
503 | * On success, returns number of elements stored in @array | |
504 | * %-EBADMSG on XDR buffer overflow | |
505 | * %-EMSGSIZE if the size of the array exceeds @array_size | |
506 | */ | |
507 | static inline ssize_t | |
508 | xdr_stream_decode_uint32_array(struct xdr_stream *xdr, | |
509 | __u32 *array, size_t array_size) | |
510 | { | |
511 | __be32 *p; | |
512 | __u32 len; | |
513 | ssize_t retval; | |
514 | ||
515 | if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0)) | |
516 | return -EBADMSG; | |
517 | p = xdr_inline_decode(xdr, len * sizeof(*p)); | |
518 | if (unlikely(!p)) | |
519 | return -EBADMSG; | |
520 | if (array == NULL) | |
521 | return len; | |
522 | if (len <= array_size) { | |
523 | if (len < array_size) | |
524 | memset(array+len, 0, (array_size-len)*sizeof(*array)); | |
525 | array_size = len; | |
526 | retval = len; | |
527 | } else | |
528 | retval = -EMSGSIZE; | |
529 | for (; array_size > 0; p++, array++, array_size--) | |
530 | *array = be32_to_cpup(p); | |
531 | return retval; | |
532 | } | |
1da177e4 LT |
533 | #endif /* __KERNEL__ */ |
534 | ||
535 | #endif /* _SUNRPC_XDR_H_ */ |