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 * We're still requiring the BKL in the xdr code until it's been
41 * more carefully audited, at which point this wrapper will become
42 * unnecessary.
43 */
44 static inline int rpc_call_xdrproc(kxdrproc_t xdrproc, void *rqstp, __be32 *data, void *obj)
45 {
46 int ret;
47
48 lock_kernel();
49 ret = xdrproc(rqstp, data, obj);
50 unlock_kernel();
51 return ret;
52 }
53
54 /*
55 * Basic structure for transmission/reception of a client XDR message.
56 * Features a header (for a linear buffer containing RPC headers
57 * and the data payload for short messages), and then an array of
58 * pages.
59 * The tail iovec allows you to append data after the page array. Its
60 * main interest is for appending padding to the pages in order to
61 * satisfy the int_32-alignment requirements in RFC1832.
62 *
63 * For the future, we might want to string several of these together
64 * in a list if anybody wants to make use of NFSv4 COMPOUND
65 * operations and/or has a need for scatter/gather involving pages.
66 */
67 struct xdr_buf {
68 struct kvec head[1], /* RPC header + non-page data */
69 tail[1]; /* Appended after page data */
70
71 struct page ** pages; /* Array of contiguous pages */
72 unsigned int page_base, /* Start of page data */
73 page_len, /* Length of page data */
74 flags; /* Flags for data disposition */
75 #define XDRBUF_READ 0x01 /* target of file read */
76 #define XDRBUF_WRITE 0x02 /* source of file write */
77
78 unsigned int buflen, /* Total length of storage buffer */
79 len; /* Length of XDR encoded message */
80
81 };
82
83 /*
84 * pre-xdr'ed macros.
85 */
86
87 #define xdr_zero __constant_htonl(0)
88 #define xdr_one __constant_htonl(1)
89 #define xdr_two __constant_htonl(2)
90
91 #define rpc_success __constant_htonl(RPC_SUCCESS)
92 #define rpc_prog_unavail __constant_htonl(RPC_PROG_UNAVAIL)
93 #define rpc_prog_mismatch __constant_htonl(RPC_PROG_MISMATCH)
94 #define rpc_proc_unavail __constant_htonl(RPC_PROC_UNAVAIL)
95 #define rpc_garbage_args __constant_htonl(RPC_GARBAGE_ARGS)
96 #define rpc_system_err __constant_htonl(RPC_SYSTEM_ERR)
97 #define rpc_drop_reply __constant_htonl(RPC_DROP_REPLY)
98
99 #define rpc_auth_ok __constant_htonl(RPC_AUTH_OK)
100 #define rpc_autherr_badcred __constant_htonl(RPC_AUTH_BADCRED)
101 #define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
102 #define rpc_autherr_badverf __constant_htonl(RPC_AUTH_BADVERF)
103 #define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
104 #define rpc_autherr_tooweak __constant_htonl(RPC_AUTH_TOOWEAK)
105 #define rpcsec_gsserr_credproblem __constant_htonl(RPCSEC_GSS_CREDPROBLEM)
106 #define rpcsec_gsserr_ctxproblem __constant_htonl(RPCSEC_GSS_CTXPROBLEM)
107 #define rpc_autherr_oldseqnum __constant_htonl(101)
108
109 /*
110 * Miscellaneous XDR helper functions
111 */
112 __be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
113 __be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
114 __be32 *xdr_encode_string(__be32 *p, const char *s);
115 __be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
116 unsigned int maxlen);
117 __be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
118 __be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
119
120 void xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
121 unsigned int);
122 void xdr_inline_pages(struct xdr_buf *, unsigned int,
123 struct page **, unsigned int, unsigned int);
124
125 static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
126 {
127 return xdr_encode_opaque(p, s, len);
128 }
129
130 /*
131 * Decode 64bit quantities (NFSv3 support)
132 */
133 static inline __be32 *
134 xdr_encode_hyper(__be32 *p, __u64 val)
135 {
136 *p++ = htonl(val >> 32);
137 *p++ = htonl(val & 0xFFFFFFFF);
138 return p;
139 }
140
141 static inline __be32 *
142 xdr_decode_hyper(__be32 *p, __u64 *valp)
143 {
144 *valp = ((__u64) ntohl(*p++)) << 32;
145 *valp |= ntohl(*p++);
146 return p;
147 }
148
149 /*
150 * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
151 */
152 static inline int
153 xdr_adjust_iovec(struct kvec *iov, __be32 *p)
154 {
155 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
156 }
157
158 /*
159 * XDR buffer helper functions
160 */
161 extern void xdr_shift_buf(struct xdr_buf *, size_t);
162 extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
163 extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
164 extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
165 extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
166 extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
167
168 /*
169 * Helper structure for copying from an sk_buff.
170 */
171 struct xdr_skb_reader {
172 struct sk_buff *skb;
173 unsigned int offset;
174 size_t count;
175 __wsum csum;
176 };
177
178 typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
179
180 size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
181 extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
182 extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
183 struct xdr_skb_reader *, xdr_skb_read_actor);
184
185 extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
186 extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
187
188 struct xdr_array2_desc;
189 typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
190 struct xdr_array2_desc {
191 unsigned int elem_size;
192 unsigned int array_len;
193 unsigned int array_maxlen;
194 xdr_xcode_elem_t xcode;
195 };
196
197 extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
198 struct xdr_array2_desc *desc);
199 extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
200 struct xdr_array2_desc *desc);
201
202 /*
203 * Provide some simple tools for XDR buffer overflow-checking etc.
204 */
205 struct xdr_stream {
206 __be32 *p; /* start of available buffer */
207 struct xdr_buf *buf; /* XDR buffer to read/write */
208
209 __be32 *end; /* end of available buffer space */
210 struct kvec *iov; /* pointer to the current kvec */
211 };
212
213 extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
214 extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
215 extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
216 unsigned int base, unsigned int len);
217 extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
218 extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
219 extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
220 extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
221 extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
222
223 #endif /* __KERNEL__ */
224
225 #endif /* _SUNRPC_XDR_H_ */
226
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