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_
16 #include <linux/uio.h>
17 #include <asm/byteorder.h>
18 #include <asm/unaligned.h>
19 #include <linux/scatterlist.h>
27 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
30 * Generic opaque `network object.' At the kernel level, this type
31 * is used only by lockd.
33 #define XDR_MAX_NETOBJ 1024
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
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.
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.
53 struct kvec head[1], /* RPC header + non-page data */
54 tail[1]; /* Appended after page data */
57 struct page ** pages; /* Array of pages */
58 unsigned int page_base, /* Start of page data */
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 */
63 #define XDRBUF_SPARSE_PAGES 0x04 /* Page array is sparse */
65 unsigned int buflen, /* Total length of storage buffer */
66 len; /* Length of XDR encoded message */
70 xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
72 buf->head[0].iov_base = start;
73 buf->head[0].iov_len = len;
74 buf->tail[0].iov_len = 0;
86 #define xdr_zero cpu_to_be32(0)
87 #define xdr_one cpu_to_be32(1)
88 #define xdr_two cpu_to_be32(2)
90 #define rpc_auth_null cpu_to_be32(RPC_AUTH_NULL)
91 #define rpc_auth_unix cpu_to_be32(RPC_AUTH_UNIX)
92 #define rpc_auth_short cpu_to_be32(RPC_AUTH_SHORT)
93 #define rpc_auth_gss cpu_to_be32(RPC_AUTH_GSS)
95 #define rpc_call cpu_to_be32(RPC_CALL)
96 #define rpc_reply cpu_to_be32(RPC_REPLY)
98 #define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
100 #define rpc_success cpu_to_be32(RPC_SUCCESS)
101 #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
102 #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
103 #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
104 #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
105 #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
106 #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
108 #define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
109 #define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
111 #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
112 #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
113 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
114 #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
115 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
116 #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
117 #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
118 #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
121 * Miscellaneous XDR helper functions
123 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
124 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
125 __be32 *xdr_encode_string(__be32 *p, const char *s);
126 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
127 unsigned int maxlen);
128 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
129 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
131 void xdr_inline_pages(struct xdr_buf *, unsigned int,
132 struct page **, unsigned int, unsigned int);
133 void xdr_terminate_string(struct xdr_buf *, const u32);
134 size_t xdr_buf_pagecount(struct xdr_buf *buf);
135 int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
136 void xdr_free_bvec(struct xdr_buf *buf);
138 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
140 return xdr_encode_opaque(p, s, len);
144 * Decode 64bit quantities (NFSv3 support)
146 static inline __be32 *
147 xdr_encode_hyper(__be32 *p, __u64 val)
149 put_unaligned_be64(val, p);
153 static inline __be32 *
154 xdr_decode_hyper(__be32 *p, __u64 *valp)
156 *valp = get_unaligned_be64(p);
160 static inline __be32 *
161 xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
164 return p + XDR_QUADLEN(len);
168 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
171 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
173 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
177 * XDR buffer helper functions
179 extern void xdr_shift_buf(struct xdr_buf *, size_t);
180 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
181 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
182 extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
183 extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
184 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
185 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
188 * Helper structure for copying from an sk_buff.
190 struct xdr_skb_reader {
197 typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
199 extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
201 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
202 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
204 struct xdr_array2_desc;
205 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
206 struct xdr_array2_desc {
207 unsigned int elem_size;
208 unsigned int array_len;
209 unsigned int array_maxlen;
210 xdr_xcode_elem_t xcode;
213 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
214 struct xdr_array2_desc *desc);
215 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
216 struct xdr_array2_desc *desc);
217 extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
221 * Provide some simple tools for XDR buffer overflow-checking etc.
224 __be32 *p; /* start of available buffer */
225 struct xdr_buf *buf; /* XDR buffer to read/write */
227 __be32 *end; /* end of available buffer space */
228 struct kvec *iov; /* pointer to the current kvec */
229 struct kvec scratch; /* Scratch buffer */
230 struct page **page_ptr; /* pointer to the current page */
231 unsigned int nwords; /* Remaining decode buffer length */
233 struct rpc_rqst *rqst; /* For debugging */
237 * These are the xdr_stream style generic XDR encode and decode functions.
239 typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
241 typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
244 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
245 __be32 *p, struct rpc_rqst *rqst);
246 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
247 extern void xdr_commit_encode(struct xdr_stream *xdr);
248 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
249 extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
250 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
251 unsigned int base, unsigned int len);
252 extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
253 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
254 __be32 *p, struct rpc_rqst *rqst);
255 extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
256 struct page **pages, unsigned int len);
257 extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
258 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
259 extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
260 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
261 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
264 * xdr_stream_remaining - Return the number of bytes remaining in the stream
265 * @xdr: pointer to struct xdr_stream
268 * Number of bytes remaining in @xdr before xdr->end
271 xdr_stream_remaining(const struct xdr_stream *xdr)
273 return xdr->nwords << 2;
276 ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
278 ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
279 size_t maxlen, gfp_t gfp_flags);
280 ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
282 ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
283 size_t maxlen, gfp_t gfp_flags);
285 * xdr_align_size - Calculate padded size of an object
286 * @n: Size of an object being XDR encoded (in bytes)
289 * Size (in bytes) of the object including xdr padding
292 xdr_align_size(size_t n)
294 const size_t mask = sizeof(__u32) - 1;
296 return (n + mask) & ~mask;
300 * xdr_stream_encode_u32 - Encode a 32-bit integer
301 * @xdr: pointer to xdr_stream
302 * @n: integer to encode
305 * On success, returns length in bytes of XDR buffer consumed
306 * %-EMSGSIZE on XDR buffer overflow
308 static inline ssize_t
309 xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
311 const size_t len = sizeof(n);
312 __be32 *p = xdr_reserve_space(xdr, len);
321 * xdr_stream_encode_u64 - Encode a 64-bit integer
322 * @xdr: pointer to xdr_stream
323 * @n: 64-bit integer to encode
326 * On success, returns length in bytes of XDR buffer consumed
327 * %-EMSGSIZE on XDR buffer overflow
329 static inline ssize_t
330 xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
332 const size_t len = sizeof(n);
333 __be32 *p = xdr_reserve_space(xdr, len);
337 xdr_encode_hyper(p, n);
342 * xdr_stream_encode_opaque_inline - Encode opaque xdr data
343 * @xdr: pointer to xdr_stream
344 * @ptr: pointer to void pointer
345 * @len: size of object
348 * On success, returns length in bytes of XDR buffer consumed
349 * %-EMSGSIZE on XDR buffer overflow
351 static inline ssize_t
352 xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
354 size_t count = sizeof(__u32) + xdr_align_size(len);
355 __be32 *p = xdr_reserve_space(xdr, count);
361 xdr_encode_opaque(p, NULL, len);
367 * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
368 * @xdr: pointer to xdr_stream
369 * @ptr: pointer to opaque data object
370 * @len: size of object pointed to by @ptr
373 * On success, returns length in bytes of XDR buffer consumed
374 * %-EMSGSIZE on XDR buffer overflow
376 static inline ssize_t
377 xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
379 __be32 *p = xdr_reserve_space(xdr, len);
383 xdr_encode_opaque_fixed(p, ptr, len);
384 return xdr_align_size(len);
388 * xdr_stream_encode_opaque - Encode variable length opaque xdr data
389 * @xdr: pointer to xdr_stream
390 * @ptr: pointer to opaque data object
391 * @len: size of object pointed to by @ptr
394 * On success, returns length in bytes of XDR buffer consumed
395 * %-EMSGSIZE on XDR buffer overflow
397 static inline ssize_t
398 xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
400 size_t count = sizeof(__u32) + xdr_align_size(len);
401 __be32 *p = xdr_reserve_space(xdr, count);
405 xdr_encode_opaque(p, ptr, len);
410 * xdr_stream_encode_uint32_array - Encode variable length array of integers
411 * @xdr: pointer to xdr_stream
412 * @array: array of integers
413 * @array_size: number of elements in @array
416 * On success, returns length in bytes of XDR buffer consumed
417 * %-EMSGSIZE on XDR buffer overflow
419 static inline ssize_t
420 xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
421 const __u32 *array, size_t array_size)
423 ssize_t ret = (array_size+1) * sizeof(__u32);
424 __be32 *p = xdr_reserve_space(xdr, ret);
428 *p++ = cpu_to_be32(array_size);
429 for (; array_size > 0; p++, array++, array_size--)
430 *p = cpu_to_be32p(array);
435 * xdr_stream_decode_u32 - Decode a 32-bit integer
436 * @xdr: pointer to xdr_stream
437 * @ptr: location to store integer
441 * %-EBADMSG on XDR buffer overflow
443 static inline ssize_t
444 xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
446 const size_t count = sizeof(*ptr);
447 __be32 *p = xdr_inline_decode(xdr, count);
451 *ptr = be32_to_cpup(p);
456 * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
457 * @xdr: pointer to xdr_stream
458 * @ptr: location to store data
459 * @len: size of buffer pointed to by @ptr
462 * On success, returns size of object stored in @ptr
463 * %-EBADMSG on XDR buffer overflow
465 static inline ssize_t
466 xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
468 __be32 *p = xdr_inline_decode(xdr, len);
472 xdr_decode_opaque_fixed(p, ptr, len);
477 * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
478 * @xdr: pointer to xdr_stream
479 * @ptr: location to store pointer to opaque data
480 * @maxlen: maximum acceptable object size
482 * Note: the pointer stored in @ptr cannot be assumed valid after the XDR
483 * buffer has been destroyed, or even after calling xdr_inline_decode()
484 * on @xdr. It is therefore expected that the object it points to should
485 * be processed immediately.
488 * On success, returns size of object stored in *@ptr
489 * %-EBADMSG on XDR buffer overflow
490 * %-EMSGSIZE if the size of the object would exceed @maxlen
492 static inline ssize_t
493 xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
499 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
502 p = xdr_inline_decode(xdr, len);
505 if (unlikely(len > maxlen))
513 * xdr_stream_decode_uint32_array - Decode variable length array of integers
514 * @xdr: pointer to xdr_stream
515 * @array: location to store the integer array or NULL
516 * @array_size: number of elements to store
519 * On success, returns number of elements stored in @array
520 * %-EBADMSG on XDR buffer overflow
521 * %-EMSGSIZE if the size of the array exceeds @array_size
523 static inline ssize_t
524 xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
525 __u32 *array, size_t array_size)
531 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
533 p = xdr_inline_decode(xdr, len * sizeof(*p));
538 if (len <= array_size) {
539 if (len < array_size)
540 memset(array+len, 0, (array_size-len)*sizeof(*array));
545 for (; array_size > 0; p++, array++, array_size--)
546 *array = be32_to_cpup(p);
549 #endif /* __KERNEL__ */
551 #endif /* _SUNRPC_XDR_H_ */