2 * XDR standard data types and function declarations
4 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
7 * RFC 4506 "XDR: External Data Representation Standard", May 2006
10 #ifndef _SUNRPC_XDR_H_
11 #define _SUNRPC_XDR_H_
15 #include <linux/uio.h>
16 #include <asm/byteorder.h>
17 #include <asm/unaligned.h>
18 #include <linux/scatterlist.h>
23 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
26 * Generic opaque `network object.' At the kernel level, this type
27 * is used only by lockd.
29 #define XDR_MAX_NETOBJ 1024
36 * This is the legacy generic XDR function. rqstp is either a rpc_rqst
37 * (client side) or svc_rqst pointer (server side).
38 * Encode functions always assume there's enough room in the buffer.
40 typedef int (*kxdrproc_t
)(void *rqstp
, __be32
*data
, void *obj
);
43 * Basic structure for transmission/reception of a client XDR message.
44 * Features a header (for a linear buffer containing RPC headers
45 * and the data payload for short messages), and then an array of
47 * The tail iovec allows you to append data after the page array. Its
48 * main interest is for appending padding to the pages in order to
49 * satisfy the int_32-alignment requirements in RFC1832.
51 * For the future, we might want to string several of these together
52 * in a list if anybody wants to make use of NFSv4 COMPOUND
53 * operations and/or has a need for scatter/gather involving pages.
56 struct kvec head
[1], /* RPC header + non-page data */
57 tail
[1]; /* Appended after page data */
59 struct page
** pages
; /* Array of pages */
60 unsigned int page_base
, /* Start of page data */
61 page_len
, /* Length of page data */
62 flags
; /* Flags for data disposition */
63 #define XDRBUF_READ 0x01 /* target of file read */
64 #define XDRBUF_WRITE 0x02 /* source of file write */
66 unsigned int buflen
, /* Total length of storage buffer */
67 len
; /* Length of XDR encoded message */
71 xdr_buf_init(struct xdr_buf
*buf
, void *start
, size_t len
)
73 buf
->head
[0].iov_base
= start
;
74 buf
->head
[0].iov_len
= len
;
75 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_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)
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)
109 * Miscellaneous XDR helper functions
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
*);
119 void xdr_inline_pages(struct xdr_buf
*, unsigned int,
120 struct page
**, unsigned int, unsigned int);
121 void xdr_terminate_string(struct xdr_buf
*, const u32
);
123 static inline __be32
*xdr_encode_array(__be32
*p
, const void *s
, unsigned int len
)
125 return xdr_encode_opaque(p
, s
, len
);
129 * Decode 64bit quantities (NFSv3 support)
131 static inline __be32
*
132 xdr_encode_hyper(__be32
*p
, __u64 val
)
134 put_unaligned_be64(val
, p
);
138 static inline __be32
*
139 xdr_decode_hyper(__be32
*p
, __u64
*valp
)
141 *valp
= get_unaligned_be64(p
);
145 static inline __be32
*
146 xdr_decode_opaque_fixed(__be32
*p
, void *ptr
, unsigned int len
)
149 return p
+ XDR_QUADLEN(len
);
153 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
156 xdr_adjust_iovec(struct kvec
*iov
, __be32
*p
)
158 return iov
->iov_len
= ((u8
*) p
- (u8
*) iov
->iov_base
);
162 * XDR buffer helper functions
164 extern void xdr_shift_buf(struct xdr_buf
*, size_t);
165 extern void xdr_buf_from_iov(struct kvec
*, struct xdr_buf
*);
166 extern int xdr_buf_subsegment(struct xdr_buf
*, struct xdr_buf
*, unsigned int, unsigned int);
167 extern void xdr_buf_trim(struct xdr_buf
*, unsigned int);
168 extern int xdr_buf_read_netobj(struct xdr_buf
*, struct xdr_netobj
*, unsigned int);
169 extern int read_bytes_from_xdr_buf(struct xdr_buf
*, unsigned int, void *, unsigned int);
170 extern int write_bytes_to_xdr_buf(struct xdr_buf
*, unsigned int, void *, unsigned int);
173 * Helper structure for copying from an sk_buff.
175 struct xdr_skb_reader
{
182 typedef size_t (*xdr_skb_read_actor
)(struct xdr_skb_reader
*desc
, void *to
, size_t len
);
184 size_t xdr_skb_read_bits(struct xdr_skb_reader
*desc
, void *to
, size_t len
);
185 extern int csum_partial_copy_to_xdr(struct xdr_buf
*, struct sk_buff
*);
186 extern ssize_t
xdr_partial_copy_from_skb(struct xdr_buf
*, unsigned int,
187 struct xdr_skb_reader
*, xdr_skb_read_actor
);
189 extern int xdr_encode_word(struct xdr_buf
*, unsigned int, u32
);
190 extern int xdr_decode_word(struct xdr_buf
*, unsigned int, u32
*);
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
;
197 unsigned int array_maxlen
;
198 xdr_xcode_elem_t xcode
;
201 extern int xdr_decode_array2(struct xdr_buf
*buf
, unsigned int base
,
202 struct xdr_array2_desc
*desc
);
203 extern int xdr_encode_array2(struct xdr_buf
*buf
, unsigned int base
,
204 struct xdr_array2_desc
*desc
);
205 extern void _copy_from_pages(char *p
, struct page
**pages
, size_t pgbase
,
209 * Provide some simple tools for XDR buffer overflow-checking etc.
212 __be32
*p
; /* start of available buffer */
213 struct xdr_buf
*buf
; /* XDR buffer to read/write */
215 __be32
*end
; /* end of available buffer space */
216 struct kvec
*iov
; /* pointer to the current kvec */
217 struct kvec scratch
; /* Scratch buffer */
218 struct page
**page_ptr
; /* pointer to the current page */
219 unsigned int nwords
; /* Remaining decode buffer length */
223 * These are the xdr_stream style generic XDR encode and decode functions.
225 typedef void (*kxdreproc_t
)(void *rqstp
, struct xdr_stream
*xdr
, void *obj
);
226 typedef int (*kxdrdproc_t
)(void *rqstp
, struct xdr_stream
*xdr
, void *obj
);
228 extern void xdr_init_encode(struct xdr_stream
*xdr
, struct xdr_buf
*buf
, __be32
*p
);
229 extern __be32
*xdr_reserve_space(struct xdr_stream
*xdr
, size_t nbytes
);
230 extern void xdr_commit_encode(struct xdr_stream
*xdr
);
231 extern void xdr_truncate_encode(struct xdr_stream
*xdr
, size_t len
);
232 extern int xdr_restrict_buflen(struct xdr_stream
*xdr
, int newbuflen
);
233 extern void xdr_write_pages(struct xdr_stream
*xdr
, struct page
**pages
,
234 unsigned int base
, unsigned int len
);
235 extern unsigned int xdr_stream_pos(const struct xdr_stream
*xdr
);
236 extern void xdr_init_decode(struct xdr_stream
*xdr
, struct xdr_buf
*buf
, __be32
*p
);
237 extern void xdr_init_decode_pages(struct xdr_stream
*xdr
, struct xdr_buf
*buf
,
238 struct page
**pages
, unsigned int len
);
239 extern void xdr_set_scratch_buffer(struct xdr_stream
*xdr
, void *buf
, size_t buflen
);
240 extern __be32
*xdr_inline_decode(struct xdr_stream
*xdr
, size_t nbytes
);
241 extern unsigned int xdr_read_pages(struct xdr_stream
*xdr
, unsigned int len
);
242 extern void xdr_enter_page(struct xdr_stream
*xdr
, unsigned int len
);
243 extern int xdr_process_buf(struct xdr_buf
*buf
, unsigned int offset
, unsigned int len
, int (*actor
)(struct scatterlist
*, void *), void *data
);
245 #endif /* __KERNEL__ */
247 #endif /* _SUNRPC_XDR_H_ */