92 lines
3.7 KiB
Python
92 lines
3.7 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from os_ken.lib.packet import icmpv6
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from os_ken.lib.packet import in_proto
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from os_ken.ofproto import ether
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from dragonflow.controller.common import constants as const
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from dragonflow.controller.common import utils
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class NeighborAdvertiser(object):
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"""
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A class for creating and removing Neighbor Advertisers (Neighbor Discovery)
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The class will match Neighbor Solicitation requests, and advertise
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the response.
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@param network_key The network's unique key in which the port exists
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@param interface_ip The port's IPv6 address
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@param interface_mac The port's physical address. Optional only in case
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of remove.
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"""
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def __init__(self, app, network_key, interface_ip,
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interface_mac=None, table_id=const.IPV6_ND_TABLE):
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self.app = app
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self.datapath = app.datapath
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self.network_key = network_key
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self.interface_ip = interface_ip
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self.mac_address = interface_mac
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self.table_id = table_id
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def _get_match(self):
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parser = self.datapath.ofproto_parser
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match = parser.OFPMatch()
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match.set_dl_type(ether.ETH_TYPE_IPV6)
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match.set_ip_proto(in_proto.IPPROTO_ICMPV6)
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match.set_ipv6_dst(utils.ipv6_text_to_short(self.interface_ip))
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match.set_icmpv6_type(icmpv6.ND_NEIGHBOR_SOLICIT)
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if self.network_key is not None:
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match.set_metadata(self.network_key)
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return match
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def _get_instructions(self):
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ofproto = self.datapath.ofproto
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parser = self.datapath.ofproto_parser
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actions = [
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parser.OFPActionSetField(icmpv6_type=icmpv6.ND_NEIGHBOR_ADVERT),
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parser.NXActionRegMove(src_field='ipv6_src',
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dst_field='ipv6_dst',
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n_bits=128),
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parser.NXActionRegMove(src_field='eth_src',
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dst_field='eth_dst',
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n_bits=48),
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parser.OFPActionSetField(eth_src=self.mac_address),
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parser.OFPActionSetField(ipv6_nd_sll=self.mac_address),
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parser.NXActionRegMove(src_field='reg6',
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dst_field='reg7',
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n_bits=32),
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]
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instructions = [
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parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions),
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parser.OFPInstructionGotoTable(const.INGRESS_DISPATCH_TABLE),
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]
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return instructions
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def add(self):
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match = self._get_match()
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instructions = self._get_instructions()
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ofproto = self.datapath.ofproto
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self.app.mod_flow(table_id=self.table_id,
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command=ofproto.OFPFC_ADD,
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priority=const.PRIORITY_MEDIUM,
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match=match,
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inst=instructions,
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flags=ofproto.OFPFF_SEND_FLOW_REM)
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def remove(self):
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ofproto = self.datapath.ofproto
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match = self._get_match()
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self.app.mod_flow(table_id=self.table_id,
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command=ofproto.OFPFC_DELETE,
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priority=const.PRIORITY_MEDIUM,
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match=match)
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