blob: adfd0e771a14bcdd760dd187d3d1632139778a64 [file] [log] [blame]
Rich Lanea06d0c32013-03-25 08:52:03 -07001:: # Copyright 2013, Big Switch Networks, Inc.
2:: #
3:: # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
4:: # the following special exception:
5:: #
6:: # LOXI Exception
7:: #
8:: # As a special exception to the terms of the EPL, you may distribute libraries
9:: # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
10:: # that copyright and licensing notices generated by LoxiGen are not altered or removed
11:: # from the LoxiGen Libraries and the notice provided below is (i) included in
12:: # the LoxiGen Libraries, if distributed in source code form and (ii) included in any
13:: # documentation for the LoxiGen Libraries, if distributed in binary form.
14:: #
15:: # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
16:: #
17:: # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
18:: # a copy of the EPL at:
19:: #
Rich Lane3b9b28e2013-11-29 20:00:45 -080020:: # http://www.eclipse.org/legal/epl-v10.html
Rich Lanea06d0c32013-03-25 08:52:03 -070021:: #
22:: # Unless required by applicable law or agreed to in writing, software
23:: # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
24:: # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
25:: # EPL for the specific language governing permissions and limitations
26:: # under the EPL.
27::
Rich Lanea06d0c32013-03-25 08:52:03 -070028def parse_header(buf):
29 if len(buf) < 8:
30 raise loxi.ProtocolError("too short to be an OpenFlow message")
31 return struct.unpack_from("!BBHL", buf)
32
33def parse_message(buf):
34 msg_ver, msg_type, msg_len, msg_xid = parse_header(buf)
Rich Laneedbb4cb2015-01-20 15:42:25 -080035 if msg_ver != ofp.OFP_VERSION and msg_type != ofp.OFPT_HELLO:
36 raise loxi.ProtocolError("wrong OpenFlow version (expected %d, got %d)" % (ofp.OFP_VERSION, msg_ver))
Rich Lanea06d0c32013-03-25 08:52:03 -070037 if len(buf) != msg_len:
38 raise loxi.ProtocolError("incorrect message size")
Rich Lane78a3bc42013-11-29 19:22:08 -080039 return message.unpack(loxi.generic_util.OFReader(buf))