1 /*
2 * include/linux/sunrpc/xdr.h
3 *
4 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
5 */
6
7 #ifndef _SUNRPC_XDR_H_
8 #define _SUNRPC_XDR_H_
9
10 #ifdef __KERNEL__
11
12 #include <linux/uio.h>
13 #include <asm/byteorder.h>
14 #include <linux/scatterlist.h>
15 #include <linux/smp_lock.h>
16
17 /*
18 * Buffer adjustment
19 */
20 #define XDR_QUADLEN(l) (((l) + 3) >> 2)
21
22 /*
23 * Generic opaque `network object.' At the kernel level, this type
24 * is used only by lockd.
25 */
26 #define XDR_MAX_NETOBJ 1024
27 struct xdr_netobj {
28 unsigned int len;
29 u8 * data;
30 };
31
32 /*
33 * This is the generic XDR function. rqstp is either a rpc_rqst (client
34 * side) or svc_rqst pointer (server side).
35 * Encode functions always assume there's enough room in the buffer.
36 */
37 typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
38
39 /*
40 * Basic structure for transmission/reception of a client XDR message.
41 * Features a header (for a linear buffer containing RPC headers
42 * and the data payload for short messages), and then an array of
43 * pages.
44 * The tail iovec allows you to append data after the page array. Its
45 * main interest is for appending padding to the pages in order to
46 * satisfy the int_32-alignment requirements in RFC1832.
47 *
48 * For the future, we might want to string several of these together
49 * in a list if anybody wants to make use of NFSv4 COMPOUND
50 * operations and/or has a need for scatter/gather involving pages.
51 */
52 struct xdr_buf {
53 struct kvec head[1], /* RPC header + non-page data */
54 tail[1]; /* Appended after page data */
55
56 struct page ** pages; /* Array of contiguous pages */
57 unsigned int page_base, /* Start of page data */
58 page_len, /* Length of page data */
59 flags; /* Flags for data disposition */
60 #define XDRBUF_READ 0x01 /* target of file read */
61 #define XDRBUF_WRITE 0x02 /* source of file write */
62
63 unsigned int buflen, /* Total length of storage buffer */
64 len; /* Length of XDR encoded message */
65
66 };
67
68 /*
69 * pre-xdr'ed macros.
70 */
71
72 #define xdr_zero __constant_htonl(0)
73 #define xdr_one __constant_htonl(1)
74 #define xdr_two __constant_htonl(2)
75
76 #define rpc_success __constant_htonl(RPC_SUCCESS)
77 #define rpc_prog_unavail __constant_htonl(RPC_PROG_UNAVAIL)
78 #define rpc_prog_mismatch __constant_htonl(RPC_PROG_MISMATCH)
79 #define rpc_proc_unavail __constant_htonl(RPC_PROC_UNAVAIL)
80 #define rpc_garbage_args __constant_htonl(RPC_GARBAGE_ARGS)
81 #define rpc_system_err __constant_htonl(RPC_SYSTEM_ERR)
82 #define rpc_drop_reply __constant_htonl(RPC_DROP_REPLY)
83
84 #define rpc_auth_ok __constant_htonl(RPC_AUTH_OK)
85 #define rpc_autherr_badcred __constant_htonl(RPC_AUTH_BADCRED)
86 #define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
87 #define rpc_autherr_badverf __constant_htonl(RPC_AUTH_BADVERF)
88 #define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
89 #define rpc_autherr_tooweak __constant_htonl(RPC_AUTH_TOOWEAK)
90 #define rpcsec_gsserr_credproblem __constant_htonl(RPCSEC_GSS_CREDPROBLEM)
91 #define rpcsec_gsserr_ctxproblem __constant_htonl(RPCSEC_GSS_CTXPROBLEM)
92 #define rpc_autherr_oldseqnum __constant_htonl(101)
93
94 /*
95 * Miscellaneous XDR helper functions
96 */
97 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
98 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
99 __be32 *xdr_encode_string(__be32 *p, const char *s);
100 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
101 unsigned int maxlen);
102 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
103 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
104
105 void xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
106 unsigned int);
107 void xdr_inline_pages(struct xdr_buf *, unsigned int,
108 struct page **, unsigned int, unsigned int);
109
xdr_encode_array(__be32 * p,const void * s,unsigned int len)110 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
111 {
112 return xdr_encode_opaque(p, s, len);
113 }
114
115 /*
116 * Decode 64bit quantities (NFSv3 support)
117 */
118 static inline __be32 *
xdr_encode_hyper(__be32 * p,__u64 val)119 xdr_encode_hyper(__be32 *p, __u64 val)
120 {
121 *p++ = htonl(val >> 32);
122 *p++ = htonl(val & 0xFFFFFFFF);
123 return p;
124 }
125
126 static inline __be32 *
xdr_decode_hyper(__be32 * p,__u64 * valp)127 xdr_decode_hyper(__be32 *p, __u64 *valp)
128 {
129 *valp = ((__u64) ntohl(*p++)) << 32;
130 *valp |= ntohl(*p++);
131 return p;
132 }
133
134 /*
135 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
136 */
137 static inline int
xdr_adjust_iovec(struct kvec * iov,__be32 * p)138 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
139 {
140 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
141 }
142
143 /*
144 * XDR buffer helper functions
145 */
146 extern void xdr_shift_buf(struct xdr_buf *, size_t);
147 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
148 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
149 extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
150 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
151 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
152
153 /*
154 * Helper structure for copying from an sk_buff.
155 */
156 struct xdr_skb_reader {
157 struct sk_buff *skb;
158 unsigned int offset;
159 size_t count;
160 __wsum csum;
161 };
162
163 typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
164
165 size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
166 extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
167 extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
168 struct xdr_skb_reader *, xdr_skb_read_actor);
169
170 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
171 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
172
173 struct xdr_array2_desc;
174 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
175 struct xdr_array2_desc {
176 unsigned int elem_size;
177 unsigned int array_len;
178 unsigned int array_maxlen;
179 xdr_xcode_elem_t xcode;
180 };
181
182 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
183 struct xdr_array2_desc *desc);
184 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
185 struct xdr_array2_desc *desc);
186
187 /*
188 * Provide some simple tools for XDR buffer overflow-checking etc.
189 */
190 struct xdr_stream {
191 __be32 *p; /* start of available buffer */
192 struct xdr_buf *buf; /* XDR buffer to read/write */
193
194 __be32 *end; /* end of available buffer space */
195 struct kvec *iov; /* pointer to the current kvec */
196 };
197
198 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
199 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
200 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
201 unsigned int base, unsigned int len);
202 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
203 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
204 extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
205 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
206 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
207
208 #endif /* __KERNEL__ */
209
210 #endif /* _SUNRPC_XDR_H_ */
211