1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * linux/include/linux/sunrpc/msg_prot.h
4  *
5  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
6  */
7 
8 #ifndef _LINUX_SUNRPC_MSGPROT_H_
9 #define _LINUX_SUNRPC_MSGPROT_H_
10 
11 #define RPC_VERSION 2
12 
13 /* spec defines authentication flavor as an unsigned 32 bit integer */
14 typedef u32	rpc_authflavor_t;
15 
16 enum rpc_auth_flavors {
17 	RPC_AUTH_NULL  = 0,
18 	RPC_AUTH_UNIX  = 1,
19 	RPC_AUTH_SHORT = 2,
20 	RPC_AUTH_DES   = 3,
21 	RPC_AUTH_KRB   = 4,
22 	RPC_AUTH_GSS   = 6,
23 	RPC_AUTH_TLS   = 7,
24 	RPC_AUTH_MAXFLAVOR = 8,
25 	/* pseudoflavors: */
26 	RPC_AUTH_GSS_KRB5  = 390003,
27 	RPC_AUTH_GSS_KRB5I = 390004,
28 	RPC_AUTH_GSS_KRB5P = 390005,
29 	RPC_AUTH_GSS_LKEY  = 390006,
30 	RPC_AUTH_GSS_LKEYI = 390007,
31 	RPC_AUTH_GSS_LKEYP = 390008,
32 	RPC_AUTH_GSS_SPKM  = 390009,
33 	RPC_AUTH_GSS_SPKMI = 390010,
34 	RPC_AUTH_GSS_SPKMP = 390011,
35 };
36 
37 /* Maximum size (in octets) of the machinename in an AUTH_UNIX
38  * credential (per RFC 5531 Appendix A)
39  */
40 #define RPC_MAX_MACHINENAME	(255)
41 
42 /* Maximum size (in bytes) of an rpc credential or verifier */
43 #define RPC_MAX_AUTH_SIZE (400)
44 
45 enum rpc_msg_type {
46 	RPC_CALL = 0,
47 	RPC_REPLY = 1
48 };
49 
50 enum rpc_reply_stat {
51 	RPC_MSG_ACCEPTED = 0,
52 	RPC_MSG_DENIED = 1
53 };
54 
55 enum rpc_accept_stat {
56 	RPC_SUCCESS = 0,
57 	RPC_PROG_UNAVAIL = 1,
58 	RPC_PROG_MISMATCH = 2,
59 	RPC_PROC_UNAVAIL = 3,
60 	RPC_GARBAGE_ARGS = 4,
61 	RPC_SYSTEM_ERR = 5,
62 	/* internal use only */
63 	RPC_DROP_REPLY = 60000,
64 };
65 
66 enum rpc_reject_stat {
67 	RPC_MISMATCH = 0,
68 	RPC_AUTH_ERROR = 1
69 };
70 
71 enum rpc_auth_stat {
72 	RPC_AUTH_OK = 0,
73 	RPC_AUTH_BADCRED = 1,
74 	RPC_AUTH_REJECTEDCRED = 2,
75 	RPC_AUTH_BADVERF = 3,
76 	RPC_AUTH_REJECTEDVERF = 4,
77 	RPC_AUTH_TOOWEAK = 5,
78 	/* RPCSEC_GSS errors */
79 	RPCSEC_GSS_CREDPROBLEM = 13,
80 	RPCSEC_GSS_CTXPROBLEM = 14
81 };
82 
83 #define RPC_MAXNETNAMELEN	256
84 
85 /*
86  * From RFC 1831:
87  *
88  * "A record is composed of one or more record fragments.  A record
89  *  fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
90  *  fragment data.  The bytes encode an unsigned binary number; as with
91  *  XDR integers, the byte order is from highest to lowest.  The number
92  *  encodes two values -- a boolean which indicates whether the fragment
93  *  is the last fragment of the record (bit value 1 implies the fragment
94  *  is the last fragment) and a 31-bit unsigned binary value which is the
95  *  length in bytes of the fragment's data.  The boolean value is the
96  *  highest-order bit of the header; the length is the 31 low-order bits.
97  *  (Note that this record specification is NOT in XDR standard form!)"
98  *
99  * The Linux RPC client always sends its requests in a single record
100  * fragment, limiting the maximum payload size for stream transports to
101  * 2GB.
102  */
103 
104 typedef __be32	rpc_fraghdr;
105 
106 #define	RPC_LAST_STREAM_FRAGMENT	(1U << 31)
107 #define	RPC_FRAGMENT_SIZE_MASK		(~RPC_LAST_STREAM_FRAGMENT)
108 #define	RPC_MAX_FRAGMENT_SIZE		((1U << 31) - 1)
109 
110 /*
111  * RPC call and reply header size as number of 32bit words (verifier
112  * size computed separately, see below)
113  */
114 #define RPC_CALLHDRSIZE		(6)
115 #define RPC_REPHDRSIZE		(4)
116 
117 
118 /*
119  * Maximum RPC header size, including authentication,
120  * as number of 32bit words (see RFCs 1831, 1832).
121  *
122  *	xid			    1 xdr unit = 4 bytes
123  *	mtype			    1
124  *	rpc_version		    1
125  *	program			    1
126  *	prog_version		    1
127  *	procedure		    1
128  *	cred {
129  *	    flavor		    1
130  *	    length		    1
131  *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
132  *	}
133  *	verf {
134  *	    flavor		    1
135  *	    length		    1
136  *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
137  *	}
138  *	TOTAL			    210 xdr units = 840 bytes
139  */
140 #define RPC_MAX_HEADER_WITH_AUTH \
141 	(RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
142 
143 #define RPC_MAX_REPHEADER_WITH_AUTH \
144 	(RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))
145 
146 /*
147  * Well-known netids. See:
148  *
149  *   https://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
150  */
151 #define RPCBIND_NETID_UDP	"udp"
152 #define RPCBIND_NETID_TCP	"tcp"
153 #define RPCBIND_NETID_RDMA	"rdma"
154 #define RPCBIND_NETID_SCTP	"sctp"
155 #define RPCBIND_NETID_UDP6	"udp6"
156 #define RPCBIND_NETID_TCP6	"tcp6"
157 #define RPCBIND_NETID_RDMA6	"rdma6"
158 #define RPCBIND_NETID_SCTP6	"sctp6"
159 #define RPCBIND_NETID_LOCAL	"local"
160 
161 /*
162  * Note that RFC 1833 does not put any size restrictions on the
163  * netid string, but all currently defined netid's fit in 5 bytes.
164  */
165 #define RPCBIND_MAXNETIDLEN	(5u)
166 
167 /*
168  * Universal addresses are introduced in RFC 1833 and further spelled
169  * out in RFC 3530.  RPCBIND_MAXUADDRLEN defines a maximum byte length
170  * of a universal address for use in allocating buffers and character
171  * arrays.
172  *
173  * Quoting RFC 3530, section 2.2:
174  *
175  * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
176  * US-ASCII string:
177  *
178  *	h1.h2.h3.h4.p1.p2
179  *
180  * The prefix, "h1.h2.h3.h4", is the standard textual form for
181  * representing an IPv4 address, which is always four octets long.
182  * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
183  * the first through fourth octets each converted to ASCII-decimal.
184  * Assuming big-endian ordering, p1 and p2 are, respectively, the first
185  * and second octets each converted to ASCII-decimal.  For example, if a
186  * host, in big-endian order, has an address of 0x0A010307 and there is
187  * a service listening on, in big endian order, port 0x020F (decimal
188  * 527), then the complete universal address is "10.1.3.7.2.15".
189  *
190  * ...
191  *
192  * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
193  * US-ASCII string:
194  *
195  *	x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
196  *
197  * The suffix "p1.p2" is the service port, and is computed the same way
198  * as with universal addresses for TCP and UDP over IPv4.  The prefix,
199  * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
200  * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
201  * Additionally, the two alternative forms specified in Section 2.2 of
202  * [RFC2373] are also acceptable.
203  */
204 
205 #include <linux/inet.h>
206 
207 /* Maximum size of the port number part of a universal address */
208 #define RPCBIND_MAXUADDRPLEN	sizeof(".255.255")
209 
210 /* Maximum size of an IPv4 universal address */
211 #define RPCBIND_MAXUADDR4LEN	\
212 		(INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
213 
214 /* Maximum size of an IPv6 universal address */
215 #define RPCBIND_MAXUADDR6LEN	\
216 		(INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
217 
218 /* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
219 #define RPCBIND_MAXUADDRLEN	RPCBIND_MAXUADDR6LEN
220 
221 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */
222