| Rich Lane | a06d0c3 | 2013-03-25 08:52:03 -0700 | [diff] [blame] | 1 | :: # 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 Lane | 3b9b28e | 2013-11-29 20:00:45 -0800 | [diff] [blame] | 20 | :: # http://www.eclipse.org/legal/epl-v10.html |
| Rich Lane | a06d0c3 | 2013-03-25 08:52:03 -0700 | [diff] [blame] | 21 | :: # |
| 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 Lane | a06d0c3 | 2013-03-25 08:52:03 -0700 | [diff] [blame] | 28 | def 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 | |
| 33 | def parse_message(buf): |
| 34 | msg_ver, msg_type, msg_len, msg_xid = parse_header(buf) |
| Rich Lane | 1c5db11 | 2013-06-14 00:00:54 -0700 | [diff] [blame] | 35 | if msg_ver != const.OFP_VERSION and msg_type != const.OFPT_HELLO: |
| 36 | raise loxi.ProtocolError("wrong OpenFlow version (expected %d, got %d)" % (const.OFP_VERSION, msg_ver)) |
| Rich Lane | a06d0c3 | 2013-03-25 08:52:03 -0700 | [diff] [blame] | 37 | if len(buf) != msg_len: |
| 38 | raise loxi.ProtocolError("incorrect message size") |
| Rich Lane | 78a3bc4 | 2013-11-29 19:22:08 -0800 | [diff] [blame] | 39 | return message.unpack(loxi.generic_util.OFReader(buf)) |