e2612ddd44
This reverts commit 98998118d6.
My bad. Somehow applied twice.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Internet Group Management Protocol(IGMP) packet parser/serializer
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RFC 1112
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IGMP v1 format
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Version| Type | Unused | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Group Address |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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RFC 2236
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IGMP v2 format
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Max Resp Time | Checksum |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Group Address |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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"""
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import struct
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from ryu.lib import addrconv
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from ryu.lib.packet import packet_base
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from ryu.lib.packet import packet_utils
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IGMP_TYPE_QUERY = 0x11
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IGMP_TYPE_REPORT_V1 = 0x12
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IGMP_TYPE_REPORT_V2 = 0x16
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IGMP_TYPE_LEAVE = 0x17
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IGMP_TYPE_REPORT_V3 = 0x22
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QUERY_RESPONSE_INTERVAL = 10.0
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LAST_MEMBER_QUERY_INTERVAL = 1.0
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MULTICAST_IP_ALL_HOST = '224.0.0.1'
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MULTICAST_MAC_ALL_HOST = '01:00:5e:00:00:01'
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class igmp(packet_base.PacketBase):
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"""
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Internet Group Management Protocol(IGMP, RFC 1112, RFC 2236)
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header encoder/decoder class.
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http://www.ietf.org/rfc/rfc1112.txt
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http://www.ietf.org/rfc/rfc2236.txt
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An instance has the following attributes at least.
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Most of them are same to the on-wire counterparts but in host byte
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order.
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__init__ takes the correspondig args in this order.
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=============== ====================================================
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Attribute Description
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=============== ====================================================
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msgtype a message type for v2, or a combination of
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version and a message type for v1.
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maxresp max response time in unit of 1/10 second. it is
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meaningful only in Query Message.
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csum a check sum value. 0 means automatically-calculate
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when encoding.
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address a group address value.
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=============== ====================================================
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* NOTE: IGMP v3(RFC 3376) is not supported yet.
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"""
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_PACK_STR = '!BBH4s'
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_MIN_LEN = struct.calcsize(_PACK_STR)
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def __init__(self, msgtype, maxresp, csum, address):
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super(igmp, self).__init__()
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self.msgtype = msgtype
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self.maxresp = maxresp
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self.csum = csum
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self.address = address
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@classmethod
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def parser(cls, buf):
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assert cls._MIN_LEN <= len(buf)
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(msgtype, maxresp, csum, address
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) = struct.unpack_from(cls._PACK_STR, buf)
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return (cls(msgtype, maxresp, csum,
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addrconv.ipv4.bin_to_text(address)),
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None,
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buf[cls._MIN_LEN:])
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def serialize(self, payload, prev):
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hdr = bytearray(struct.pack(self._PACK_STR, self.msgtype,
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self.maxresp, self.csum,
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addrconv.ipv4.text_to_bin(self.address)))
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if self.csum == 0:
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self.csum = packet_utils.checksum(hdr)
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struct.pack_into('!H', hdr, 2, self.csum)
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return hdr
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