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.'
28 #define XDR_MAX_NETOBJ 1024
35 * This is the legacy generic XDR function. rqstp is either a rpc_rqst
36 * (client side) or svc_rqst pointer (server side).
37 * Encode functions always assume there's enough room in the buffer.
39 typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
42 * Basic structure for transmission/reception of a client XDR message.
43 * Features a header (for a linear buffer containing RPC headers
44 * and the data payload for short messages), and then an array of
46 * The tail iovec allows you to append data after the page array. Its
47 * main interest is for appending padding to the pages in order to
48 * satisfy the int_32-alignment requirements in RFC1832.
50 * For the future, we might want to string several of these together
51 * in a list if anybody wants to make use of NFSv4 COMPOUND
52 * operations and/or has a need for scatter/gather involving pages.
55 struct kvec head[1], /* RPC header + non-page data */
56 tail[1]; /* Appended after page data */
58 struct page ** pages; /* Array of pages */
59 unsigned int page_base, /* Start of page data */
60 page_len, /* Length of page data */
61 flags; /* Flags for data disposition */
62 #define XDRBUF_READ 0x01 /* target of file read */
63 #define XDRBUF_WRITE 0x02 /* source of file write */
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;
85 #define xdr_zero cpu_to_be32(0)
86 #define xdr_one cpu_to_be32(1)
87 #define xdr_two cpu_to_be32(2)
89 #define rpc_success cpu_to_be32(RPC_SUCCESS)
90 #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
91 #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
92 #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
93 #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
94 #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
95 #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
97 #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
98 #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
99 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
100 #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
101 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
102 #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
103 #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
104 #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
105 #define rpc_autherr_oldseqnum cpu_to_be32(101)
108 * Miscellaneous XDR helper functions
110 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
111 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
112 __be32 *xdr_encode_string(__be32 *p, const char *s);
113 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
114 unsigned int maxlen);
115 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
116 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
118 void xdr_inline_pages(struct xdr_buf *, unsigned int,
119 struct page **, unsigned int, unsigned int);
120 void xdr_terminate_string(struct xdr_buf *, const u32);
122 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
124 return xdr_encode_opaque(p, s, len);
128 * Decode 64bit quantities (NFSv3 support)
130 static inline __be32 *
131 xdr_encode_hyper(__be32 *p, __u64 val)
133 put_unaligned_be64(val, p);
137 static inline __be32 *
138 xdr_decode_hyper(__be32 *p, __u64 *valp)
140 *valp = get_unaligned_be64(p);
144 static inline __be32 *
145 xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
148 return p + XDR_QUADLEN(len);
152 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
155 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
157 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
161 * XDR buffer helper functions
163 extern void xdr_shift_buf(struct xdr_buf *, size_t);
164 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
165 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
166 extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
167 extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
168 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
169 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
172 * Helper structure for copying from an sk_buff.
174 struct xdr_skb_reader {
181 typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
183 size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
184 extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
185 extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
186 struct xdr_skb_reader *, xdr_skb_read_actor);
188 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
189 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
191 struct xdr_array2_desc;
192 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
193 struct xdr_array2_desc {
194 unsigned int elem_size;
195 unsigned int array_len;
196 unsigned int array_maxlen;
197 xdr_xcode_elem_t xcode;
200 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
201 struct xdr_array2_desc *desc);
202 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
203 struct xdr_array2_desc *desc);
204 extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
208 * Provide some simple tools for XDR buffer overflow-checking etc.
211 __be32 *p; /* start of available buffer */
212 struct xdr_buf *buf; /* XDR buffer to read/write */
214 __be32 *end; /* end of available buffer space */
215 struct kvec *iov; /* pointer to the current kvec */
216 struct kvec scratch; /* Scratch buffer */
217 struct page **page_ptr; /* pointer to the current page */
218 unsigned int nwords; /* Remaining decode buffer length */
222 * These are the xdr_stream style generic XDR encode and decode functions.
224 typedef void (*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
225 typedef int (*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
227 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
228 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
229 extern void xdr_commit_encode(struct xdr_stream *xdr);
230 extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
231 extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
232 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
233 unsigned int base, unsigned int len);
234 extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
235 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
236 extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
237 struct page **pages, unsigned int len);
238 extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
239 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
240 extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
241 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
242 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
244 #endif /* __KERNEL__ */
246 #endif /* _SUNRPC_XDR_H_ */