[linux-block.git] / include / linux / sunrpc / msg_prot.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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_

#define RPC_VERSION 2

/* 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_TLS   = 7,
	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 octets) of the machinename in an AUTH_UNIX
 * credential (per RFC 5531 Appendix A)
 */
#define RPC_MAX_MACHINENAME	(255)

/* 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,
	/* internal use only */
	RPC_DROP_REPLY = 60000,
};

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_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))

#define RPC_MAX_REPHEADER_WITH_AUTH \
	(RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))

/*
 * Well-known netids. See:
 *
 *   https://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
 */
#define RPCBIND_NETID_UDP	"udp"
#define RPCBIND_NETID_TCP	"tcp"
#define RPCBIND_NETID_RDMA	"rdma"
#define RPCBIND_NETID_SCTP	"sctp"
#define RPCBIND_NETID_UDP6	"udp6"
#define RPCBIND_NETID_TCP6	"tcp6"
#define RPCBIND_NETID_RDMA6	"rdma6"
#define RPCBIND_NETID_SCTP6	"sctp6"
#define RPCBIND_NETID_LOCAL	"local"

/*
 * Note that RFC 1833 does not put any size restrictions on the
 * netid string, but all currently defined netid's fit in 5 bytes.
 */
#define RPCBIND_MAXNETIDLEN	(5u)

/*
 * Universal addresses are introduced in RFC 1833 and further spelled
 * out in RFC 3530.  RPCBIND_MAXUADDRLEN defines a maximum byte length
 * of a universal address for use in allocating buffers and character
 * arrays.
 *
 * Quoting RFC 3530, section 2.2:
 *
 * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
 * US-ASCII string:
 *
 *	h1.h2.h3.h4.p1.p2
 *
 * The prefix, "h1.h2.h3.h4", is the standard textual form for
 * representing an IPv4 address, which is always four octets long.
 * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
 * the first through fourth octets each converted to ASCII-decimal.
 * Assuming big-endian ordering, p1 and p2 are, respectively, the first
 * and second octets each converted to ASCII-decimal.  For example, if a
 * host, in big-endian order, has an address of 0x0A010307 and there is
 * a service listening on, in big endian order, port 0x020F (decimal
 * 527), then the complete universal address is "10.1.3.7.2.15".
 *
 * ...
 *
 * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
 * US-ASCII string:
 *
 *	x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
 *
 * The suffix "p1.p2" is the service port, and is computed the same way
 * as with universal addresses for TCP and UDP over IPv4.  The prefix,
 * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
 * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
 * Additionally, the two alternative forms specified in Section 2.2 of
 * [RFC2373] are also acceptable.
 */

#include <linux/inet.h>

/* Maximum size of the port number part of a universal address */
#define RPCBIND_MAXUADDRPLEN	sizeof(".255.255")

/* Maximum size of an IPv4 universal address */
#define RPCBIND_MAXUADDR4LEN	\
		(INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)

/* Maximum size of an IPv6 universal address */
#define RPCBIND_MAXUADDR6LEN	\
		(INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)

/* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
#define RPCBIND_MAXUADDRLEN	RPCBIND_MAXUADDR6LEN

#endif /* _LINUX_SUNRPC_MSGPROT_H_ */
Commit	Line	Data
	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_ */