1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/include/linux/sunrpc/msg_prot.h
5 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 #ifndef _LINUX_SUNRPC_MSGPROT_H_
9 #define _LINUX_SUNRPC_MSGPROT_H_
13 /* spec defines authentication flavor as an unsigned 32 bit integer */
14 typedef u32 rpc_authflavor_t;
16 enum rpc_auth_flavors {
24 RPC_AUTH_MAXFLAVOR = 8,
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,
37 /* Maximum size (in bytes) of an rpc credential or verifier */
38 #define RPC_MAX_AUTH_SIZE (400)
50 enum rpc_accept_stat {
53 RPC_PROG_MISMATCH = 2,
57 /* internal use only */
58 RPC_DROP_REPLY = 60000,
61 enum rpc_reject_stat {
69 RPC_AUTH_REJECTEDCRED = 2,
71 RPC_AUTH_REJECTEDVERF = 4,
73 /* RPCSEC_GSS errors */
74 RPCSEC_GSS_CREDPROBLEM = 13,
75 RPCSEC_GSS_CTXPROBLEM = 14
78 #define RPC_MAXNETNAMELEN 256
83 * "A record is composed of one or more record fragments. A record
84 * fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
85 * fragment data. The bytes encode an unsigned binary number; as with
86 * XDR integers, the byte order is from highest to lowest. The number
87 * encodes two values -- a boolean which indicates whether the fragment
88 * is the last fragment of the record (bit value 1 implies the fragment
89 * is the last fragment) and a 31-bit unsigned binary value which is the
90 * length in bytes of the fragment's data. The boolean value is the
91 * highest-order bit of the header; the length is the 31 low-order bits.
92 * (Note that this record specification is NOT in XDR standard form!)"
94 * The Linux RPC client always sends its requests in a single record
95 * fragment, limiting the maximum payload size for stream transports to
99 typedef __be32 rpc_fraghdr;
101 #define RPC_LAST_STREAM_FRAGMENT (1U << 31)
102 #define RPC_FRAGMENT_SIZE_MASK (~RPC_LAST_STREAM_FRAGMENT)
103 #define RPC_MAX_FRAGMENT_SIZE ((1U << 31) - 1)
106 * RPC call and reply header size as number of 32bit words (verifier
107 * size computed separately, see below)
109 #define RPC_CALLHDRSIZE (6)
110 #define RPC_REPHDRSIZE (4)
114 * Maximum RPC header size, including authentication,
115 * as number of 32bit words (see RFCs 1831, 1832).
117 * xid 1 xdr unit = 4 bytes
126 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
131 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
133 * TOTAL 210 xdr units = 840 bytes
135 #define RPC_MAX_HEADER_WITH_AUTH \
136 (RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
138 #define RPC_MAX_REPHEADER_WITH_AUTH \
139 (RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))
142 * Well-known netids. See:
144 * https://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
146 #define RPCBIND_NETID_UDP "udp"
147 #define RPCBIND_NETID_TCP "tcp"
148 #define RPCBIND_NETID_RDMA "rdma"
149 #define RPCBIND_NETID_SCTP "sctp"
150 #define RPCBIND_NETID_UDP6 "udp6"
151 #define RPCBIND_NETID_TCP6 "tcp6"
152 #define RPCBIND_NETID_RDMA6 "rdma6"
153 #define RPCBIND_NETID_SCTP6 "sctp6"
154 #define RPCBIND_NETID_LOCAL "local"
157 * Note that RFC 1833 does not put any size restrictions on the
158 * netid string, but all currently defined netid's fit in 5 bytes.
160 #define RPCBIND_MAXNETIDLEN (5u)
163 * Universal addresses are introduced in RFC 1833 and further spelled
164 * out in RFC 3530. RPCBIND_MAXUADDRLEN defines a maximum byte length
165 * of a universal address for use in allocating buffers and character
168 * Quoting RFC 3530, section 2.2:
170 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
175 * The prefix, "h1.h2.h3.h4", is the standard textual form for
176 * representing an IPv4 address, which is always four octets long.
177 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
178 * the first through fourth octets each converted to ASCII-decimal.
179 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
180 * and second octets each converted to ASCII-decimal. For example, if a
181 * host, in big-endian order, has an address of 0x0A010307 and there is
182 * a service listening on, in big endian order, port 0x020F (decimal
183 * 527), then the complete universal address is "10.1.3.7.2.15".
187 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
190 * x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
192 * The suffix "p1.p2" is the service port, and is computed the same way
193 * as with universal addresses for TCP and UDP over IPv4. The prefix,
194 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
195 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
196 * Additionally, the two alternative forms specified in Section 2.2 of
197 * [RFC2373] are also acceptable.
200 #include <linux/inet.h>
202 /* Maximum size of the port number part of a universal address */
203 #define RPCBIND_MAXUADDRPLEN sizeof(".255.255")
205 /* Maximum size of an IPv4 universal address */
206 #define RPCBIND_MAXUADDR4LEN \
207 (INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
209 /* Maximum size of an IPv6 universal address */
210 #define RPCBIND_MAXUADDR6LEN \
211 (INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
213 /* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
214 #define RPCBIND_MAXUADDRLEN RPCBIND_MAXUADDR6LEN
216 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */