2.2.25.1 Oplock Break Response
The Oplock Break Response packet is sent by the server in response to an Oplock Break Acknowledgment from the client. This response is composed of an SMB2 header, as specified in section 2.2.1, followed by this response structure:
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1 |
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2 |
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3 |
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StructureSize |
OplockLevel |
Reserved |
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Reserved2 |
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FileId |
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... |
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StructureSize (2 bytes): The server MUST set this to 24, indicating the size of the response structure, not including the header.
OplockLevel (1 byte): The server will set this field to the granted OplockLevel value. This field MUST contain one of the following values.
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Value
Meaning
SMB2_OPLOCK_LEVEL_NONE
0x00
The server has lowered oplock level for this file to none.
SMB2_OPLOCK_LEVEL_II
0x01
The server has lowered oplock level for this file to level II.
SMB2_OPLOCK_LEVEL_EXCLUSIVE
0x08
The server has lowered oplock level for this file to level Exclusive.
Reserved (1 byte): This field MUST NOT be used and MUST be reserved. The server MUST set this to 0, and the client MUST ignore it on receipt.
Reserved2 (4 bytes): This field MUST NOT be used and MUST be reserved. The server MUST set this to 0, and the client MUST ignore it on receipt.
FileId (16 bytes): An SMB2_FILEID, as specified in section 2.2.14.1.
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The identifier of the file or pipe on which the oplock break occurred.