blob: 70c6b92e15a7ca74e7246cacf4768a6b95eccb4f [file] [log] [blame]
* XDR standard data types and function declarations
* Copyright (C) 1995-1997 Olaf Kirch <>
* Based on:
* RFC 4506 "XDR: External Data Representation Standard", May 2006
#ifndef _SUNRPC_XDR_H_
#define _SUNRPC_XDR_H_
#ifdef __KERNEL__
#include <linux/uio.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <linux/scatterlist.h>
* Buffer adjustment
#define XDR_QUADLEN(l) (((l) + 3) >> 2)
* Generic opaque `network object.' At the kernel level, this type
* is used only by lockd.
#define XDR_MAX_NETOBJ 1024
struct xdr_netobj {
unsigned int len;
u8 * data;
* This is the legacy generic XDR function. rqstp is either a rpc_rqst
* (client side) or svc_rqst pointer (server side).
* Encode functions always assume there's enough room in the buffer.
typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
* Basic structure for transmission/reception of a client XDR message.
* Features a header (for a linear buffer containing RPC headers
* and the data payload for short messages), and then an array of
* pages.
* The tail iovec allows you to append data after the page array. Its
* main interest is for appending padding to the pages in order to
* satisfy the int_32-alignment requirements in RFC1832.
* For the future, we might want to string several of these together
* in a list if anybody wants to make use of NFSv4 COMPOUND
* operations and/or has a need for scatter/gather involving pages.
struct xdr_buf {
struct kvec head[1], /* RPC header + non-page data */
tail[1]; /* Appended after page data */
struct page ** pages; /* Array of pages */
unsigned int page_base, /* Start of page data */
page_len, /* Length of page data */
flags; /* Flags for data disposition */
#define XDRBUF_READ 0x01 /* target of file read */
#define XDRBUF_WRITE 0x02 /* source of file write */
unsigned int buflen, /* Total length of storage buffer */
len; /* Length of XDR encoded message */
* pre-xdr'ed macros.
#define xdr_zero cpu_to_be32(0)
#define xdr_one cpu_to_be32(1)
#define xdr_two cpu_to_be32(2)
#define rpc_success cpu_to_be32(RPC_SUCCESS)
#define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
#define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
#define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
#define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
#define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
#define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
#define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
#define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
#define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
#define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
#define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
#define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
#define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
#define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
#define rpc_autherr_oldseqnum cpu_to_be32(101)
* Miscellaneous XDR helper functions
__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
__be32 *xdr_encode_string(__be32 *p, const char *s);
__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
unsigned int maxlen);
__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
void xdr_inline_pages(struct xdr_buf *, unsigned int,
struct page **, unsigned int, unsigned int);
void xdr_terminate_string(struct xdr_buf *, const u32);
static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
return xdr_encode_opaque(p, s, len);
* Decode 64bit quantities (NFSv3 support)
static inline __be32 *
xdr_encode_hyper(__be32 *p, __u64 val)
put_unaligned_be64(val, p);
return p + 2;
static inline __be32 *
xdr_decode_hyper(__be32 *p, __u64 *valp)
*valp = get_unaligned_be64(p);
return p + 2;
static inline __be32 *
xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
memcpy(ptr, p, len);
return p + XDR_QUADLEN(len);
* Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
static inline int
xdr_adjust_iovec(struct kvec *iov, __be32 *p)
return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
* XDR buffer helper functions
extern void xdr_shift_buf(struct xdr_buf *, size_t);
extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
* Helper structure for copying from an sk_buff.
struct xdr_skb_reader {
struct sk_buff *skb;
unsigned int offset;
size_t count;
__wsum csum;
typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
struct xdr_skb_reader *, xdr_skb_read_actor);
extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
struct xdr_array2_desc;
typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
struct xdr_array2_desc {
unsigned int elem_size;
unsigned int array_len;
unsigned int array_maxlen;
xdr_xcode_elem_t xcode;
extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
struct xdr_array2_desc *desc);
extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
struct xdr_array2_desc *desc);
extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
size_t len);
* Provide some simple tools for XDR buffer overflow-checking etc.
struct xdr_stream {
__be32 *p; /* start of available buffer */
struct xdr_buf *buf; /* XDR buffer to read/write */
__be32 *end; /* end of available buffer space */
struct kvec *iov; /* pointer to the current kvec */
struct kvec scratch; /* Scratch buffer */
struct page **page_ptr; /* pointer to the current page */
unsigned int nwords; /* Remaining decode buffer length */
* These are the xdr_stream style generic XDR encode and decode functions.
typedef void (*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
typedef int (*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
extern void xdr_commit_encode(struct xdr_stream *xdr);
extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
unsigned int base, unsigned int len);
extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
struct page **pages, unsigned int len);
extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
#endif /* __KERNEL__ */
#endif /* _SUNRPC_XDR_H_ */