2 * include/linux/sunrpc/xdr.h
4 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
12 #include <linux/uio.h>
13 #include <asm/byteorder.h>
14 #include <linux/scatterlist.h>
19 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
22 * Generic opaque `network object.' At the kernel level, this type
23 * is used only by lockd.
25 #define XDR_MAX_NETOBJ 1024
32 * This is the generic XDR function. rqstp is either a rpc_rqst (client
33 * side) or svc_rqst pointer (server side).
34 * Encode functions always assume there's enough room in the buffer.
36 typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
39 * Basic structure for transmission/reception of a client XDR message.
40 * Features a header (for a linear buffer containing RPC headers
41 * and the data payload for short messages), and then an array of
43 * The tail iovec allows you to append data after the page array. Its
44 * main interest is for appending padding to the pages in order to
45 * satisfy the int_32-alignment requirements in RFC1832.
47 * For the future, we might want to string several of these together
48 * in a list if anybody wants to make use of NFSv4 COMPOUND
49 * operations and/or has a need for scatter/gather involving pages.
52 struct kvec head[1], /* RPC header + non-page data */
53 tail[1]; /* Appended after page data */
55 struct page ** pages; /* Array of contiguous pages */
56 unsigned int page_base, /* Start of page data */
57 page_len, /* Length of page data */
58 flags; /* Flags for data disposition */
59 #define XDRBUF_READ 0x01 /* target of file read */
60 #define XDRBUF_WRITE 0x02 /* source of file write */
62 unsigned int buflen, /* Total length of storage buffer */
63 len; /* Length of XDR encoded message */
71 #define xdr_zero cpu_to_be32(0)
72 #define xdr_one cpu_to_be32(1)
73 #define xdr_two cpu_to_be32(2)
75 #define rpc_success cpu_to_be32(RPC_SUCCESS)
76 #define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
77 #define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
78 #define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
79 #define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
80 #define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
81 #define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
83 #define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
84 #define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
85 #define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
86 #define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
87 #define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
88 #define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
89 #define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
90 #define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
91 #define rpc_autherr_oldseqnum cpu_to_be32(101)
94 * Miscellaneous XDR helper functions
96 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
97 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
98 __be32 *xdr_encode_string(__be32 *p, const char *s);
99 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
100 unsigned int maxlen);
101 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
102 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
104 void xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
106 void xdr_inline_pages(struct xdr_buf *, unsigned int,
107 struct page **, unsigned int, unsigned int);
109 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
111 return xdr_encode_opaque(p, s, len);
115 * Decode 64bit quantities (NFSv3 support)
117 static inline __be32 *
118 xdr_encode_hyper(__be32 *p, __u64 val)
120 *p++ = htonl(val >> 32);
121 *p++ = htonl(val & 0xFFFFFFFF);
125 static inline __be32 *
126 xdr_decode_hyper(__be32 *p, __u64 *valp)
128 *valp = ((__u64) ntohl(*p++)) << 32;
129 *valp |= ntohl(*p++);
134 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
137 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
139 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
143 * XDR buffer helper functions
145 extern void xdr_shift_buf(struct xdr_buf *, size_t);
146 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
147 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
148 extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
149 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
150 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
153 * Helper structure for copying from an sk_buff.
155 struct xdr_skb_reader {
162 typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
164 size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
165 extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
166 extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
167 struct xdr_skb_reader *, xdr_skb_read_actor);
169 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
170 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
172 struct xdr_array2_desc;
173 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
174 struct xdr_array2_desc {
175 unsigned int elem_size;
176 unsigned int array_len;
177 unsigned int array_maxlen;
178 xdr_xcode_elem_t xcode;
181 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
182 struct xdr_array2_desc *desc);
183 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
184 struct xdr_array2_desc *desc);
187 * Provide some simple tools for XDR buffer overflow-checking etc.
190 __be32 *p; /* start of available buffer */
191 struct xdr_buf *buf; /* XDR buffer to read/write */
193 __be32 *end; /* end of available buffer space */
194 struct kvec *iov; /* pointer to the current kvec */
197 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
198 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
199 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
200 unsigned int base, unsigned int len);
201 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
202 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
203 extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
204 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
205 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
207 #endif /* __KERNEL__ */
209 #endif /* _SUNRPC_XDR_H_ */