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/*
* include/linux/sunrpc/xdr.h
*
* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _SUNRPC_XDR_H_
#define _SUNRPC_XDR_H_
#ifdef __KERNEL__
#include <linux/uio.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 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, u32 *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 iovec head[1], /* RPC header + non-page data */
tail[1]; /* Appended after page data */
struct page ** pages; /* Array of contiguous pages */
unsigned int page_base, /* Start of page data */
page_len; /* Length of page data */
unsigned int len; /* Total length of data */
};
/*
* pre-xdr'ed macros.
*/
#define xdr_zero __constant_htonl(0)
#define xdr_one __constant_htonl(1)
#define xdr_two __constant_htonl(2)
#define rpc_success __constant_htonl(RPC_SUCCESS)
#define rpc_prog_unavail __constant_htonl(RPC_PROG_UNAVAIL)
#define rpc_prog_mismatch __constant_htonl(RPC_PROG_MISMATCH)
#define rpc_proc_unavail __constant_htonl(RPC_PROC_UNAVAIL)
#define rpc_garbage_args __constant_htonl(RPC_GARBAGE_ARGS)
#define rpc_system_err __constant_htonl(RPC_SYSTEM_ERR)
#define rpc_auth_ok __constant_htonl(RPC_AUTH_OK)
#define rpc_autherr_badcred __constant_htonl(RPC_AUTH_BADCRED)
#define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
#define rpc_autherr_badverf __constant_htonl(RPC_AUTH_BADVERF)
#define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
#define rpc_autherr_tooweak __constant_htonl(RPC_AUTH_TOOWEAK)
/*
* Miscellaneous XDR helper functions
*/
u32 * xdr_encode_array(u32 *p, const char *s, unsigned int len);
u32 * xdr_encode_string(u32 *p, const char *s);
u32 * xdr_decode_string(u32 *p, char **sp, int *lenp, int maxlen);
u32 * xdr_decode_string_inplace(u32 *p, char **sp, int *lenp, int maxlen);
u32 * xdr_encode_netobj(u32 *p, const struct xdr_netobj *);
u32 * xdr_decode_netobj(u32 *p, struct xdr_netobj *);
u32 * xdr_decode_netobj_fixed(u32 *p, void *obj, unsigned int len);
void xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
unsigned int);
void xdr_inline_pages(struct xdr_buf *, unsigned int,
struct page **, unsigned int, unsigned int);
/*
* Decode 64bit quantities (NFSv3 support)
*/
static inline u32 *
xdr_encode_hyper(u32 *p, __u64 val)
{
*p++ = htonl(val >> 32);
*p++ = htonl(val & 0xFFFFFFFF);
return p;
}
static inline u32 *
xdr_decode_hyper(u32 *p, __u64 *valp)
{
*valp = ((__u64) ntohl(*p++)) << 32;
*valp |= ntohl(*p++);
return p;
}
/*
* Adjust iovec to reflect end of xdr'ed data (RPC client XDR)
*/
static inline int
xdr_adjust_iovec(struct iovec *iov, u32 *p)
{
return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
}
void xdr_shift_iovec(struct iovec *, int, size_t);
void xdr_zero_iovec(struct iovec *, int, size_t);
/*
* Maximum number of iov's we use.
*/
#define MAX_IOVEC (12)
/*
* XDR buffer helper functions
*/
extern int xdr_kmap(struct iovec *, struct xdr_buf *, unsigned int);
extern void xdr_kunmap(struct xdr_buf *, unsigned int);
extern void xdr_shift_buf(struct xdr_buf *, size_t);
/*
* Helper structure for copying from an sk_buff.
*/
typedef struct {
struct sk_buff *skb;
unsigned int offset;
size_t count;
unsigned int csum;
} skb_reader_t;
typedef size_t (*skb_read_actor_t)(skb_reader_t *desc, void *to, size_t len);
extern void xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
skb_reader_t *, skb_read_actor_t);
extern int xdr_copy_skb(struct xdr_buf *xdr, unsigned int base,
struct sk_buff *skb, unsigned int offset);
extern int xdr_copy_and_csum_skb(struct xdr_buf *xdr, unsigned int base,
struct sk_buff *skb, unsigned int offset, unsigned int csum);
#endif /* __KERNEL__ */
#endif /* _SUNRPC_XDR_H_ */
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