fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / sunrpc / msg_prot.h

diff --git a/include/linux/sunrpc/msg_prot.h b/include/linux/sunrpc/msg_prot.h
index 15f1153..606cb21 100644 (file)
--- a/include/linux/sunrpc/msg_prot.h
+++ b/include/linux/sunrpc/msg_prot.h
@@ -1,5 +1,5 @@
 /*
- * linux/include/net/sunrpc/msg_prot.h
+ * linux/include/linux/sunrpc/msg_prot.h
  *
  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
  */
@@ -11,6 +11,9 @@
 
 #define RPC_VERSION 2
 
+/* size of an XDR encoding unit in bytes, i.e. 32bit */
+#define XDR_UNIT       (4)
+
 /* spec defines authentication flavor as an unsigned 32 bit integer */
 typedef u32    rpc_authflavor_t;
 
@@ -34,6 +37,9 @@ enum rpc_auth_flavors {
        RPC_AUTH_GSS_SPKMP = 390011,
 };
 
+/* 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
@@ -50,7 +56,9 @@ enum rpc_accept_stat {
        RPC_PROG_MISMATCH = 2,
        RPC_PROC_UNAVAIL = 3,
        RPC_GARBAGE_ARGS = 4,
-       RPC_SYSTEM_ERR = 5
+       RPC_SYSTEM_ERR = 5,
+       /* internal use only */
+       RPC_DROP_REPLY = 60000,
 };
 
 enum rpc_reject_stat {
@@ -76,5 +84,64 @@ enum rpc_auth_stat {
 
 #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))
+
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_SUNRPC_MSGPROT_H_ */