1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/include/linux/sunrpc/msg_prot.h
8 #ifndef _LINUX_SUNRPC_MSGPROT_H_
9 #define _LINUX_SUNRPC_MSGPROT_H_
13 /* size of an XDR encoding unit in bytes, i.e. 32bit */
16 /* spec defines authentication flavor as an unsigned 32 bit integer */
17 typedef u32 rpc_authflavor_t;
19 enum rpc_auth_flavors {
26 RPC_AUTH_MAXFLAVOR = 8,
28 RPC_AUTH_GSS_KRB5 = 390003,
29 RPC_AUTH_GSS_KRB5I = 390004,
30 RPC_AUTH_GSS_KRB5P = 390005,
31 RPC_AUTH_GSS_LKEY = 390006,
32 RPC_AUTH_GSS_LKEYI = 390007,
33 RPC_AUTH_GSS_LKEYP = 390008,
34 RPC_AUTH_GSS_SPKM = 390009,
35 RPC_AUTH_GSS_SPKMI = 390010,
36 RPC_AUTH_GSS_SPKMP = 390011,
39 /* Maximum size (in bytes) of an rpc credential or verifier */
40 #define RPC_MAX_AUTH_SIZE (400)
52 enum rpc_accept_stat {
55 RPC_PROG_MISMATCH = 2,
59 /* internal use only */
60 RPC_DROP_REPLY = 60000,
63 enum rpc_reject_stat {
71 RPC_AUTH_REJECTEDCRED = 2,
73 RPC_AUTH_REJECTEDVERF = 4,
75 /* RPCSEC_GSS errors */
76 RPCSEC_GSS_CREDPROBLEM = 13,
77 RPCSEC_GSS_CTXPROBLEM = 14
80 #define RPC_MAXNETNAMELEN 256
85 * "A record is composed of one or more record fragments. A record
86 * fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
87 * fragment data. The bytes encode an unsigned binary number; as with
88 * XDR integers, the byte order is from highest to lowest. The number
89 * encodes two values -- a boolean which indicates whether the fragment
90 * is the last fragment of the record (bit value 1 implies the fragment
91 * is the last fragment) and a 31-bit unsigned binary value which is the
92 * length in bytes of the fragment's data. The boolean value is the
93 * highest-order bit of the header; the length is the 31 low-order bits.
94 * (Note that this record specification is NOT in XDR standard form!)"
96 * The Linux RPC client always sends its requests in a single record
97 * fragment, limiting the maximum payload size for stream transports to
101 typedef __be32 rpc_fraghdr;
103 #define RPC_LAST_STREAM_FRAGMENT (1U << 31)
104 #define RPC_FRAGMENT_SIZE_MASK (~RPC_LAST_STREAM_FRAGMENT)
105 #define RPC_MAX_FRAGMENT_SIZE ((1U << 31) - 1)
108 * RPC call and reply header size as number of 32bit words (verifier
109 * size computed separately, see below)
111 #define RPC_CALLHDRSIZE (6)
112 #define RPC_REPHDRSIZE (4)
116 * Maximum RPC header size, including authentication,
117 * as number of 32bit words (see RFCs 1831, 1832).
119 * xid 1 xdr unit = 4 bytes
128 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
133 * body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
135 * TOTAL 210 xdr units = 840 bytes
137 #define RPC_MAX_HEADER_WITH_AUTH \
138 (RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
140 #define RPC_MAX_REPHEADER_WITH_AUTH \
141 (RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))
144 * Well-known netids. See:
146 * http://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
148 #define RPCBIND_NETID_UDP "udp"
149 #define RPCBIND_NETID_TCP "tcp"
150 #define RPCBIND_NETID_RDMA "rdma"
151 #define RPCBIND_NETID_SCTP "sctp"
152 #define RPCBIND_NETID_UDP6 "udp6"
153 #define RPCBIND_NETID_TCP6 "tcp6"
154 #define RPCBIND_NETID_RDMA6 "rdma6"
155 #define RPCBIND_NETID_SCTP6 "sctp6"
156 #define RPCBIND_NETID_LOCAL "local"
159 * Note that RFC 1833 does not put any size restrictions on the
160 * netid string, but all currently defined netid's fit in 5 bytes.
162 #define RPCBIND_MAXNETIDLEN (5u)
165 * Universal addresses are introduced in RFC 1833 and further spelled
166 * out in RFC 3530. RPCBIND_MAXUADDRLEN defines a maximum byte length
167 * of a universal address for use in allocating buffers and character
170 * Quoting RFC 3530, section 2.2:
172 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
177 * The prefix, "h1.h2.h3.h4", is the standard textual form for
178 * representing an IPv4 address, which is always four octets long.
179 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
180 * the first through fourth octets each converted to ASCII-decimal.
181 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
182 * and second octets each converted to ASCII-decimal. For example, if a
183 * host, in big-endian order, has an address of 0x0A010307 and there is
184 * a service listening on, in big endian order, port 0x020F (decimal
185 * 527), then the complete universal address is "10.1.3.7.2.15".
189 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
192 * x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
194 * The suffix "p1.p2" is the service port, and is computed the same way
195 * as with universal addresses for TCP and UDP over IPv4. The prefix,
196 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
197 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
198 * Additionally, the two alternative forms specified in Section 2.2 of
199 * [RFC2373] are also acceptable.
202 #include <linux/inet.h>
204 /* Maximum size of the port number part of a universal address */
205 #define RPCBIND_MAXUADDRPLEN sizeof(".255.255")
207 /* Maximum size of an IPv4 universal address */
208 #define RPCBIND_MAXUADDR4LEN \
209 (INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
211 /* Maximum size of an IPv6 universal address */
212 #define RPCBIND_MAXUADDR6LEN \
213 (INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
215 /* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
216 #define RPCBIND_MAXUADDRLEN RPCBIND_MAXUADDR6LEN
218 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */