[Pkg-samba-maint] [samba] 02/15: dcerpc.idl: add DCERPC_NCACN_{REQUEST, RESPONSE}_DEFAULT_MAX_SIZE

[Jelmer Vernooij]

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jelmer pushed a commit to branch master
in repository samba.

commit 203c0a5e4f6c84532dfec03b5666c30f004a13cf
Author: Stefan Metzmacher <metze at samba.org>
Date:   Wed Jun 22 16:58:03 2016 +0200

    dcerpc.idl: add DCERPC_NCACN_{REQUEST,RESPONSE}_DEFAULT_MAX_SIZE
    
    This will replace DCERPC_NCACN_PAYLOAD_MAX_SIZE (4 MByte),
    this limit is too strict for some workloads, e.g. DRSUAPI replication
    with large objects.
    
    BUG: https://bugzilla.samba.org/show_bug.cgi?id=11948
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Andrew Bartlett <abartlet at samba.org>
    (cherry picked from commit 281e11b53f676647997fb9ce21227782529a62ad)
---
 librpc/idl/dcerpc.idl | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/librpc/idl/dcerpc.idl b/librpc/idl/dcerpc.idl
index 015eb3d..5e0f919 100644
--- a/librpc/idl/dcerpc.idl
+++ b/librpc/idl/dcerpc.idl
@@ -537,6 +537,23 @@ interface dcerpc
 	const uint8 DCERPC_NCACN_PAYLOAD_OFFSET = 16;
 	const uint32 DCERPC_NCACN_PAYLOAD_MAX_SIZE = 0x400000; /* 4 MByte */
 
+	/*
+	 * See [MS-RPCE] 3.3.3.5.4 Maximum Server Input Data Size
+	 * 4 MByte is the default limit of reassembled request payload
+	 */
+	const uint32 DCERPC_NCACN_REQUEST_DEFAULT_MAX_SIZE = 0x400000;
+
+	/*
+	 * See [MS-RPCE] 3.3.2.5.2 Handling Responses
+	 *
+	 * Indicates that Windows accepts up to 0x7FFFFFFF ~2 GByte
+	 *
+	 * talloc has a limit of 256 MByte, so we need to use something smaller.
+	 *
+	 * For now we try our luck with 240 MByte.
+	 */
+	const uint32 DCERPC_NCACN_RESPONSE_DEFAULT_MAX_SIZE = 0xf000000; /* 240 MByte */
+
 	/* little-endian flag */
 	const uint8 DCERPC_DREP_LE  = 0x10;
 

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