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 {
23 RPC_AUTH_MAXFLAVOR = 8,
25 RPC_AUTH_GSS_KRB5 = 390003,
26 RPC_AUTH_GSS_KRB5I = 390004,
27 RPC_AUTH_GSS_KRB5P = 390005,
28 RPC_AUTH_GSS_LKEY = 390006,
29 RPC_AUTH_GSS_LKEYI = 390007,
30 RPC_AUTH_GSS_LKEYP = 390008,
31 RPC_AUTH_GSS_SPKM = 390009,
32 RPC_AUTH_GSS_SPKMI = 390010,
33 RPC_AUTH_GSS_SPKMP = 390011,
36 /* Maximum size (in bytes) of an rpc credential or verifier */
37 #define RPC_MAX_AUTH_SIZE (400)
49 enum rpc_accept_stat {
52 RPC_PROG_MISMATCH = 2,
56 /* internal use only */
57 RPC_DROP_REPLY = 60000,
60 enum rpc_reject_stat {
68 RPC_AUTH_REJECTEDCRED = 2,
70 RPC_AUTH_REJECTEDVERF = 4,
72 /* RPCSEC_GSS errors */
73 RPCSEC_GSS_CREDPROBLEM = 13,
74 RPCSEC_GSS_CTXPROBLEM = 14
77 #define RPC_MAXNETNAMELEN 256
82 * "A record is composed of one or more record fragments. A record
83 * fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
84 * fragment data. The bytes encode an unsigned binary number; as with
85 * XDR integers, the byte order is from highest to lowest. The number
86 * encodes two values -- a boolean which indicates whether the fragment
87 * is the last fragment of the record (bit value 1 implies the fragment
88 * is the last fragment) and a 31-bit unsigned binary value which is the
89 * length in bytes of the fragment's data. The boolean value is the
90 * highest-order bit of the header; the length is the 31 low-order bits.
91 * (Note that this record specification is NOT in XDR standard form!)"
93 * The Linux RPC client always sends its requests in a single record
94 * fragment, limiting the maximum payload size for stream transports to
98 typedef __be32 rpc_fraghdr;
100 #define RPC_LAST_STREAM_FRAGMENT (1U << 31)
101 #define RPC_FRAGMENT_SIZE_MASK (~RPC_LAST_STREAM_FRAGMENT)
102 #define RPC_MAX_FRAGMENT_SIZE ((1U << 31) - 1)
105 * RPC call and reply header size as number of 32bit words (verifier
106 * size computed separately, see below)
108 #define RPC_CALLHDRSIZE (6)
109 #define RPC_REPHDRSIZE (4)
113 * Maximum RPC header size, including authentication,
114 * as number of 32bit words (see RFCs 1831, 1832).
116 * xid 1 xdr unit = 4 bytes
125 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
130 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
132 * TOTAL 210 xdr units = 840 bytes
134 #define RPC_MAX_HEADER_WITH_AUTH \
135 (RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
137 #define RPC_MAX_REPHEADER_WITH_AUTH \
138 (RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))
141 * Well-known netids. See:
143 * https://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
145 #define RPCBIND_NETID_UDP "udp"
146 #define RPCBIND_NETID_TCP "tcp"
147 #define RPCBIND_NETID_RDMA "rdma"
148 #define RPCBIND_NETID_SCTP "sctp"
149 #define RPCBIND_NETID_UDP6 "udp6"
150 #define RPCBIND_NETID_TCP6 "tcp6"
151 #define RPCBIND_NETID_RDMA6 "rdma6"
152 #define RPCBIND_NETID_SCTP6 "sctp6"
153 #define RPCBIND_NETID_LOCAL "local"
156 * Note that RFC 1833 does not put any size restrictions on the
157 * netid string, but all currently defined netid's fit in 5 bytes.
159 #define RPCBIND_MAXNETIDLEN (5u)
162 * Universal addresses are introduced in RFC 1833 and further spelled
163 * out in RFC 3530. RPCBIND_MAXUADDRLEN defines a maximum byte length
164 * of a universal address for use in allocating buffers and character
167 * Quoting RFC 3530, section 2.2:
169 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
174 * The prefix, "h1.h2.h3.h4", is the standard textual form for
175 * representing an IPv4 address, which is always four octets long.
176 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
177 * the first through fourth octets each converted to ASCII-decimal.
178 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
179 * and second octets each converted to ASCII-decimal. For example, if a
180 * host, in big-endian order, has an address of 0x0A010307 and there is
181 * a service listening on, in big endian order, port 0x020F (decimal
182 * 527), then the complete universal address is "10.1.3.7.2.15".
186 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
189 * x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
191 * The suffix "p1.p2" is the service port, and is computed the same way
192 * as with universal addresses for TCP and UDP over IPv4. The prefix,
193 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
194 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
195 * Additionally, the two alternative forms specified in Section 2.2 of
196 * [RFC2373] are also acceptable.
199 #include <linux/inet.h>
201 /* Maximum size of the port number part of a universal address */
202 #define RPCBIND_MAXUADDRPLEN sizeof(".255.255")
204 /* Maximum size of an IPv4 universal address */
205 #define RPCBIND_MAXUADDR4LEN \
206 (INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
208 /* Maximum size of an IPv6 universal address */
209 #define RPCBIND_MAXUADDR6LEN \
210 (INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
212 /* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
213 #define RPCBIND_MAXUADDRLEN RPCBIND_MAXUADDR6LEN
215 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */