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10#ifndef _SUNRPC_XDR_H_
11#define _SUNRPC_XDR_H_
12
13#ifdef __KERNEL__
14
15#include <linux/uio.h>
16#include <asm/byteorder.h>
17#include <asm/unaligned.h>
18#include <linux/scatterlist.h>
19
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22
23#define XDR_QUADLEN(l) (((l) + 3) >> 2)
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29#define XDR_MAX_NETOBJ 1024
30struct xdr_netobj {
31 unsigned int len;
32 u8 * data;
33};
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40typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
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55struct xdr_buf {
56 struct kvec head[1],
57 tail[1];
58
59 struct page ** pages;
60 unsigned int page_base,
61 page_len,
62 flags;
63#define XDRBUF_READ 0x01
64#define XDRBUF_WRITE 0x02
65
66 unsigned int buflen,
67 len;
68};
69
70static inline void
71xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
72{
73 buf->head[0].iov_base = start;
74 buf->head[0].iov_len = len;
75 buf->tail[0].iov_len = 0;
76 buf->page_len = 0;
77 buf->flags = 0;
78 buf->len = 0;
79 buf->buflen = len;
80}
81
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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_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)
107
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110
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);
114__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
115 unsigned int maxlen);
116__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
117__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
118
119void xdr_inline_pages(struct xdr_buf *, unsigned int,
120 struct page **, unsigned int, unsigned int);
121void xdr_terminate_string(struct xdr_buf *, const u32);
122
123static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
124{
125 return xdr_encode_opaque(p, s, len);
126}
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130
131static inline __be32 *
132xdr_encode_hyper(__be32 *p, __u64 val)
133{
134 put_unaligned_be64(val, p);
135 return p + 2;
136}
137
138static inline __be32 *
139xdr_decode_hyper(__be32 *p, __u64 *valp)
140{
141 *valp = get_unaligned_be64(p);
142 return p + 2;
143}
144
145static inline __be32 *
146xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
147{
148 memcpy(ptr, p, len);
149 return p + XDR_QUADLEN(len);
150}
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154
155static inline int
156xdr_adjust_iovec(struct kvec *iov, __be32 *p)
157{
158 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
159}
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164extern void xdr_shift_buf(struct xdr_buf *, size_t);
165extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
166extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
167extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
168extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
169extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
170extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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175struct xdr_skb_reader {
176 struct sk_buff *skb;
177 unsigned int offset;
178 size_t count;
179 __wsum csum;
180};
181
182typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
183
184size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
185extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
186extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
187 struct xdr_skb_reader *, xdr_skb_read_actor);
188
189extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
190extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
191
192struct xdr_array2_desc;
193typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
194struct xdr_array2_desc {
195 unsigned int elem_size;
196 unsigned int array_len;
197 unsigned int array_maxlen;
198 xdr_xcode_elem_t xcode;
199};
200
201extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
202 struct xdr_array2_desc *desc);
203extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
204 struct xdr_array2_desc *desc);
205extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
206 size_t len);
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211struct xdr_stream {
212 __be32 *p;
213 struct xdr_buf *buf;
214
215 __be32 *end;
216 struct kvec *iov;
217 struct kvec scratch;
218 struct page **page_ptr;
219 unsigned int nwords;
220};
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225typedef void (*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
226typedef int (*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
227
228extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
229extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
230extern void xdr_commit_encode(struct xdr_stream *xdr);
231extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
232extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
233extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
234 unsigned int base, unsigned int len);
235extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
236extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
237extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
238 struct page **pages, unsigned int len);
239extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
240extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
241extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
242extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
243extern 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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252static inline size_t
253xdr_stream_remaining(const struct xdr_stream *xdr)
254{
255 return xdr->nwords << 2;
256}
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265static inline size_t
266xdr_align_size(size_t n)
267{
268 const size_t mask = sizeof(__u32) - 1;
269
270 return (n + mask) & ~mask;
271}
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282static inline ssize_t
283xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
284{
285 const size_t len = sizeof(n);
286 __be32 *p = xdr_reserve_space(xdr, len);
287
288 if (unlikely(!p))
289 return -EMSGSIZE;
290 *p = cpu_to_be32(n);
291 return len;
292}
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303static inline ssize_t
304xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
305{
306 const size_t len = sizeof(n);
307 __be32 *p = xdr_reserve_space(xdr, len);
308
309 if (unlikely(!p))
310 return -EMSGSIZE;
311 xdr_encode_hyper(p, n);
312 return len;
313}
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325static inline ssize_t
326xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
327{
328 __be32 *p = xdr_reserve_space(xdr, len);
329
330 if (unlikely(!p))
331 return -EMSGSIZE;
332 xdr_encode_opaque_fixed(p, ptr, len);
333 return xdr_align_size(len);
334}
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346static inline ssize_t
347xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
348{
349 size_t count = sizeof(__u32) + xdr_align_size(len);
350 __be32 *p = xdr_reserve_space(xdr, count);
351
352 if (unlikely(!p))
353 return -EMSGSIZE;
354 xdr_encode_opaque(p, ptr, len);
355 return count;
356}
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367static inline ssize_t
368xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
369{
370 const size_t count = sizeof(*ptr);
371 __be32 *p = xdr_inline_decode(xdr, count);
372
373 if (unlikely(!p))
374 return -EBADMSG;
375 *ptr = be32_to_cpup(p);
376 return 0;
377}
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389static inline ssize_t
390xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
391{
392 __be32 *p = xdr_inline_decode(xdr, len);
393
394 if (unlikely(!p))
395 return -EBADMSG;
396 xdr_decode_opaque_fixed(p, ptr, len);
397 return len;
398}
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416static inline ssize_t
417xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
418{
419 __be32 *p;
420 __u32 len;
421
422 *ptr = NULL;
423 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
424 return -EBADMSG;
425 if (len != 0) {
426 p = xdr_inline_decode(xdr, len);
427 if (unlikely(!p))
428 return -EBADMSG;
429 if (unlikely(len > maxlen))
430 return -EMSGSIZE;
431 *ptr = p;
432 }
433 return len;
434}
435#endif
436
437#endif
438