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Linux/include/linux/sunrpc/msg_prot.h

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

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