aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/sunrpc/msg_prot.h
blob: 1e65f2dd80e5d5aa4bbd8f5a7885862cccfe5c4f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * linux/include/linux/sunrpc/msg_prot.h
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#ifndef _LINUX_SUNRPC_MSGPROT_H_
#define _LINUX_SUNRPC_MSGPROT_H_

#ifdef __KERNEL__ /* user programs should get these from the rpc header files */

#define RPC_VERSION 2

/* size of an XDR encoding unit in bytes, i.e. 32bit */
#define XDR_UNIT	(4)

/* spec defines authentication flavor as an unsigned 32 bit integer */
typedef u32	rpc_authflavor_t;

enum rpc_auth_flavors {
	RPC_AUTH_NULL  = 0,
	RPC_AUTH_UNIX  = 1,
	RPC_AUTH_SHORT = 2,
	RPC_AUTH_DES   = 3,
	RPC_AUTH_KRB   = 4,
	RPC_AUTH_GSS   = 6,
	RPC_AUTH_MAXFLAVOR = 8,
	/* pseudoflavors: */
	RPC_AUTH_GSS_KRB5  = 390003,
	RPC_AUTH_GSS_KRB5I = 390004,
	RPC_AUTH_GSS_KRB5P = 390005,
	RPC_AUTH_GSS_LKEY  = 390006,
	RPC_AUTH_GSS_LKEYI = 390007,
	RPC_AUTH_GSS_LKEYP = 390008,
	RPC_AUTH_GSS_SPKM  = 390009,
	RPC_AUTH_GSS_SPKMI = 390010,
	RPC_AUTH_GSS_SPKMP = 390011,
};

/* Maximum size (in bytes) of an rpc credential or verifier */
#define RPC_MAX_AUTH_SIZE (400)

enum rpc_msg_type {
	RPC_CALL = 0,
	RPC_REPLY = 1
};

enum rpc_reply_stat {
	RPC_MSG_ACCEPTED = 0,
	RPC_MSG_DENIED = 1
};

enum rpc_accept_stat {
	RPC_SUCCESS = 0,
	RPC_PROG_UNAVAIL = 1,
	RPC_PROG_MISMATCH = 2,
	RPC_PROC_UNAVAIL = 3,
	RPC_GARBAGE_ARGS = 4,
	RPC_SYSTEM_ERR = 5
};

enum rpc_reject_stat {
	RPC_MISMATCH = 0,
	RPC_AUTH_ERROR = 1
};

enum rpc_auth_stat {
	RPC_AUTH_OK = 0,
	RPC_AUTH_BADCRED = 1,
	RPC_AUTH_REJECTEDCRED = 2,
	RPC_AUTH_BADVERF = 3,
	RPC_AUTH_REJECTEDVERF = 4,
	RPC_AUTH_TOOWEAK = 5,
	/* RPCSEC_GSS errors */
	RPCSEC_GSS_CREDPROBLEM = 13,
	RPCSEC_GSS_CTXPROBLEM = 14
};

#define RPC_PMAP_PROGRAM	100000
#define RPC_PMAP_VERSION	2
#define RPC_PMAP_PORT		111

#define RPC_MAXNETNAMELEN	256

/*
 * From RFC 1831:
 *
 * "A record is composed of one or more record fragments.  A record
 *  fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
 *  fragment data.  The bytes encode an unsigned binary number; as with
 *  XDR integers, the byte order is from highest to lowest.  The number
 *  encodes two values -- a boolean which indicates whether the fragment
 *  is the last fragment of the record (bit value 1 implies the fragment
 *  is the last fragment) and a 31-bit unsigned binary value which is the
 *  length in bytes of the fragment's data.  The boolean value is the
 *  highest-order bit of the header; the length is the 31 low-order bits.
 *  (Note that this record specification is NOT in XDR standard form!)"
 *
 * The Linux RPC client always sends its requests in a single record
 * fragment, limiting the maximum payload size for stream transports to
 * 2GB.
 */

typedef __be32	rpc_fraghdr;

#define	RPC_LAST_STREAM_FRAGMENT	(1U << 31)
#define	RPC_FRAGMENT_SIZE_MASK		(~RPC_LAST_STREAM_FRAGMENT)
#define	RPC_MAX_FRAGMENT_SIZE		((1U << 31) - 1)

/*
 * RPC call and reply header size as number of 32bit words (verifier
 * size computed separately, see below)
 */
#define RPC_CALLHDRSIZE		(6)
#define RPC_REPHDRSIZE		(4)


/*
 * Maximum RPC header size, including authentication,
 * as number of 32bit words (see RFCs 1831, 1832).
 *
 *	xid			    1 xdr unit = 4 bytes
 *	mtype			    1
 *	rpc_version		    1
 *	program			    1
 *	prog_version		    1
 *	procedure		    1
 *	cred {
 *	    flavor		    1
 *	    length		    1
 *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
 *	}
 *	verf {
 *	    flavor		    1
 *	    length		    1
 *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
 *	}
 *	TOTAL			    210 xdr units = 840 bytes
 */
#define RPC_MAX_HEADER_WITH_AUTH \
	(RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))


#endif /* __KERNEL__ */
#endif /* _LINUX_SUNRPC_MSGPROT_H_ */