| /* |
| * 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> |
| #include <asm/byteorder.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, __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 contiguous pages */ |
| unsigned int page_base, /* Start of page data */ |
| page_len; /* Length of page data */ |
| |
| unsigned int buflen, /* Total length of storage buffer */ |
| len; /* Length of XDR encoded message */ |
| |
| }; |
| |
| /* |
| * 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_drop_reply __constant_htonl(RPC_DROP_REPLY) |
| |
| #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) |
| #define rpcsec_gsserr_credproblem __constant_htonl(RPCSEC_GSS_CREDPROBLEM) |
| #define rpcsec_gsserr_ctxproblem __constant_htonl(RPCSEC_GSS_CTXPROBLEM) |
| #define rpc_autherr_oldseqnum __constant_htonl(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, int *lenp, int maxlen); |
| __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *); |
| __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *); |
| |
| 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); |
| |
| 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) |
| { |
| *p++ = htonl(val >> 32); |
| *p++ = htonl(val & 0xFFFFFFFF); |
| return p; |
| } |
| |
| static inline __be32 * |
| xdr_decode_hyper(__be32 *p, __u64 *valp) |
| { |
| *valp = ((__u64) ntohl(*p++)) << 32; |
| *valp |= ntohl(*p++); |
| return p; |
| } |
| |
| /* |
| * 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 *, int, int); |
| extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, int); |
| extern int read_bytes_from_xdr_buf(struct xdr_buf *, int, void *, int); |
| extern int write_bytes_to_xdr_buf(struct xdr_buf *, int, void *, int); |
| |
| /* |
| * 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 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, |
| skb_reader_t *, skb_read_actor_t); |
| |
| extern int xdr_encode_word(struct xdr_buf *, int, u32); |
| extern int xdr_decode_word(struct xdr_buf *, 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); |
| |
| /* |
| * 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 */ |
| }; |
| |
| 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_write_pages(struct xdr_stream *xdr, struct page **pages, |
| unsigned int base, unsigned int len); |
| extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p); |
| extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes); |
| extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len); |
| extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len); |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _SUNRPC_XDR_H_ */ |