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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>
18#include <asm/unaligned.h>
19#include <linux/scatterlist.h>
20
21struct bio_vec;
22struct rpc_rqst;
23
24
25
26
27#define XDR_QUADLEN(l) (((l) + 3) >> 2)
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31
32
33#define XDR_MAX_NETOBJ 1024
34struct xdr_netobj {
35 unsigned int len;
36 u8 * data;
37};
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51
52struct xdr_buf {
53 struct kvec head[1],
54 tail[1];
55
56 struct bio_vec *bvec;
57 struct page ** pages;
58 unsigned int page_base,
59 page_len,
60 flags;
61#define XDRBUF_READ 0x01
62#define XDRBUF_WRITE 0x02
63#define XDRBUF_SPARSE_PAGES 0x04
64
65 unsigned int buflen,
66 len;
67};
68
69static inline void
70xdr_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;
75 buf->pages = NULL;
76 buf->page_len = 0;
77 buf->flags = 0;
78 buf->len = 0;
79 buf->buflen = len;
80}
81
82
83
84
85
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_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)
94
95#define rpc_call cpu_to_be32(RPC_CALL)
96#define rpc_reply cpu_to_be32(RPC_REPLY)
97
98#define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
99
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)
107
108#define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
109#define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
110
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)
119
120
121
122
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 *);
130
131void xdr_inline_pages(struct xdr_buf *, unsigned int,
132 struct page **, unsigned int, unsigned int);
133void xdr_terminate_string(struct xdr_buf *, const u32);
134size_t xdr_buf_pagecount(struct xdr_buf *buf);
135int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
136void xdr_free_bvec(struct xdr_buf *buf);
137
138static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
139{
140 return xdr_encode_opaque(p, s, len);
141}
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145
146static inline __be32 *
147xdr_encode_hyper(__be32 *p, __u64 val)
148{
149 put_unaligned_be64(val, p);
150 return p + 2;
151}
152
153static inline __be32 *
154xdr_decode_hyper(__be32 *p, __u64 *valp)
155{
156 *valp = get_unaligned_be64(p);
157 return p + 2;
158}
159
160static inline __be32 *
161xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
162{
163 memcpy(ptr, p, len);
164 return p + XDR_QUADLEN(len);
165}
166
167static inline void xdr_netobj_dup(struct xdr_netobj *dst,
168 struct xdr_netobj *src, gfp_t gfp_mask)
169{
170 dst->data = kmemdup(src->data, src->len, gfp_mask);
171 dst->len = src->len;
172}
173
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176
177static inline int
178xdr_adjust_iovec(struct kvec *iov, __be32 *p)
179{
180 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
181}
182
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185
186extern void xdr_shift_buf(struct xdr_buf *, size_t);
187extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
188extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
189extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
190extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
191extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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195
196struct xdr_skb_reader {
197 struct sk_buff *skb;
198 unsigned int offset;
199 size_t count;
200 __wsum csum;
201};
202
203typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
204
205extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
206
207extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
208extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
209
210struct xdr_array2_desc;
211typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
212struct xdr_array2_desc {
213 unsigned int elem_size;
214 unsigned int array_len;
215 unsigned int array_maxlen;
216 xdr_xcode_elem_t xcode;
217};
218
219extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
220 struct xdr_array2_desc *desc);
221extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
222 struct xdr_array2_desc *desc);
223extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
224 size_t len);
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228
229struct xdr_stream {
230 __be32 *p;
231 struct xdr_buf *buf;
232
233 __be32 *end;
234 struct kvec *iov;
235 struct kvec scratch;
236 struct page **page_ptr;
237 unsigned int nwords;
238
239 struct rpc_rqst *rqst;
240};
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245typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
246 const void *obj);
247typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
248 void *obj);
249
250extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
251 __be32 *p, struct rpc_rqst *rqst);
252extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
253extern void xdr_commit_encode(struct xdr_stream *xdr);
254extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
255extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
256extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
257 unsigned int base, unsigned int len);
258extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
259extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
260 __be32 *p, struct rpc_rqst *rqst);
261extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
262 struct page **pages, unsigned int len);
263extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
264extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
265extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
266extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
267extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
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276static inline size_t
277xdr_stream_remaining(const struct xdr_stream *xdr)
278{
279 return xdr->nwords << 2;
280}
281
282ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
283 size_t size);
284ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
285 size_t maxlen, gfp_t gfp_flags);
286ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
287 size_t size);
288ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
289 size_t maxlen, gfp_t gfp_flags);
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297static inline size_t
298xdr_align_size(size_t n)
299{
300 const size_t mask = sizeof(__u32) - 1;
301
302 return (n + mask) & ~mask;
303}
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314static inline ssize_t
315xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
316{
317 const size_t len = sizeof(n);
318 __be32 *p = xdr_reserve_space(xdr, len);
319
320 if (unlikely(!p))
321 return -EMSGSIZE;
322 *p = cpu_to_be32(n);
323 return len;
324}
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335static inline ssize_t
336xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
337{
338 const size_t len = sizeof(n);
339 __be32 *p = xdr_reserve_space(xdr, len);
340
341 if (unlikely(!p))
342 return -EMSGSIZE;
343 xdr_encode_hyper(p, n);
344 return len;
345}
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357static inline ssize_t
358xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
359{
360 size_t count = sizeof(__u32) + xdr_align_size(len);
361 __be32 *p = xdr_reserve_space(xdr, count);
362
363 if (unlikely(!p)) {
364 *ptr = NULL;
365 return -EMSGSIZE;
366 }
367 xdr_encode_opaque(p, NULL, len);
368 *ptr = ++p;
369 return count;
370}
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382static inline ssize_t
383xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
384{
385 __be32 *p = xdr_reserve_space(xdr, len);
386
387 if (unlikely(!p))
388 return -EMSGSIZE;
389 xdr_encode_opaque_fixed(p, ptr, len);
390 return xdr_align_size(len);
391}
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403static inline ssize_t
404xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
405{
406 size_t count = sizeof(__u32) + xdr_align_size(len);
407 __be32 *p = xdr_reserve_space(xdr, count);
408
409 if (unlikely(!p))
410 return -EMSGSIZE;
411 xdr_encode_opaque(p, ptr, len);
412 return count;
413}
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425static inline ssize_t
426xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
427 const __u32 *array, size_t array_size)
428{
429 ssize_t ret = (array_size+1) * sizeof(__u32);
430 __be32 *p = xdr_reserve_space(xdr, ret);
431
432 if (unlikely(!p))
433 return -EMSGSIZE;
434 *p++ = cpu_to_be32(array_size);
435 for (; array_size > 0; p++, array++, array_size--)
436 *p = cpu_to_be32p(array);
437 return ret;
438}
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449static inline ssize_t
450xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
451{
452 const size_t count = sizeof(*ptr);
453 __be32 *p = xdr_inline_decode(xdr, count);
454
455 if (unlikely(!p))
456 return -EBADMSG;
457 *ptr = be32_to_cpup(p);
458 return 0;
459}
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471static inline ssize_t
472xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
473{
474 __be32 *p = xdr_inline_decode(xdr, len);
475
476 if (unlikely(!p))
477 return -EBADMSG;
478 xdr_decode_opaque_fixed(p, ptr, len);
479 return len;
480}
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498static inline ssize_t
499xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
500{
501 __be32 *p;
502 __u32 len;
503
504 *ptr = NULL;
505 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
506 return -EBADMSG;
507 if (len != 0) {
508 p = xdr_inline_decode(xdr, len);
509 if (unlikely(!p))
510 return -EBADMSG;
511 if (unlikely(len > maxlen))
512 return -EMSGSIZE;
513 *ptr = p;
514 }
515 return len;
516}
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529static inline ssize_t
530xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
531 __u32 *array, size_t array_size)
532{
533 __be32 *p;
534 __u32 len;
535 ssize_t retval;
536
537 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
538 return -EBADMSG;
539 p = xdr_inline_decode(xdr, len * sizeof(*p));
540 if (unlikely(!p))
541 return -EBADMSG;
542 if (array == NULL)
543 return len;
544 if (len <= array_size) {
545 if (len < array_size)
546 memset(array+len, 0, (array_size-len)*sizeof(*array));
547 array_size = len;
548 retval = len;
549 } else
550 retval = -EMSGSIZE;
551 for (; array_size > 0; p++, array++, array_size--)
552 *array = be32_to_cpup(p);
553 return retval;
554}
555#endif
556
557#endif
558