c14a4182d3
for example:
>>> from ryu.lib.packet.ipv4 import ipv4
>>> o = ipv4(src='127.0.0.1')
>>> o.src
'127.0.0.1'
>>>
i left lldp TLVs as they seem to be treated opaque.
for now, i don't change mac.DONTCARE and mac.BROADCAST because
they are used by the ofproto world as well.
Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
# Copyright (C) 2012 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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import struct
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import socket
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from . import packet_base
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from . import packet_utils
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from . import icmpv6
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from . import tcp
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from ryu.ofproto import inet
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from ryu.lib import addrconv
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IPV6_ADDRESS_PACK_STR = '!16s'
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IPV6_ADDRESS_LEN = struct.calcsize(IPV6_ADDRESS_PACK_STR)
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IPV6_PSEUDO_HEADER_PACK_STR = '!16s16s3xB'
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class ipv6(packet_base.PacketBase):
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"""IPv6 (RFC 2460) header encoder/decoder class.
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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 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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version Version
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traffic_class Traffic Class
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flow_label When decoding, Flow Label. \
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When encoding, the most significant 8 bits of Flow Label.
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payload_length Payload Length
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nxt Next Header
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hop_limit Hop Limit
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src Source Address
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dst Destination Address
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============== ====================
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"""
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_PACK_STR = '!IHBB16s16s'
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_MIN_LEN = struct.calcsize(_PACK_STR)
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def __init__(self, version, traffic_class, flow_label, payload_length,
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nxt, hop_limit, src, dst):
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super(ipv6, self).__init__()
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self.version = version
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self.traffic_class = traffic_class
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self.flow_label = flow_label
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self.payload_length = payload_length
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self.nxt = nxt
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self.hop_limit = hop_limit
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self.src = src
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self.dst = dst
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@classmethod
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def parser(cls, buf):
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(v_tc_flow, payload_length, nxt, hlim, src, dst) = struct.unpack_from(
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cls._PACK_STR, buf)
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version = v_tc_flow >> 28
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traffic_class = (v_tc_flow >> 20) & 0xff
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flow_label = v_tc_flow & 0xfffff
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hop_limit = hlim
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msg = cls(version, traffic_class, flow_label, payload_length,
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nxt, hop_limit, addrconv.ipv6.bin_to_text(src),
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addrconv.ipv6.bin_to_text(dst))
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return msg, ipv6.get_packet_type(nxt), buf[cls._MIN_LEN:payload_length]
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def serialize(self, payload, prev):
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hdr = bytearray(40)
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v_tc_flow = (self.version << 28 | self.traffic_class << 20 |
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self.flow_label << 12)
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struct.pack_into(ipv6._PACK_STR, hdr, 0, v_tc_flow,
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self.payload_length, self.nxt, self.hop_limit,
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addrconv.ipv6.text_to_bin(self.src),
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addrconv.ipv6.text_to_bin(self.dst))
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return hdr
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ipv6.register_packet_type(icmpv6.icmpv6, inet.IPPROTO_ICMPV6)
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ipv6.register_packet_type(tcp.tcp, inet.IPPROTO_TCP)
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