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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import random
import string
import logging
from netmodel.model.type import Integer, String
from vicn.core.attribute import Attribute, Reference
from vicn.core.exception import ResourceNotFound
from vicn.core.state import ResourceState, AttributeState
from vicn.core.task import inline_task, async_task, run_task
from vicn.core.task import get_attributes_task, BashTask
from vicn.resource.channel import Channel
from vicn.resource.interface import Interface
from vicn.resource.linux.net_device import NonTapBaseNetDevice
from vicn.resource.node import Node
# FIXME remove VPP specific code
from vicn.resource.vpp.interface import VPPInterface
log = logging.getLogger(__name__)
CMD_DELETE_IF_EXISTS='ip link show {interface.device_name} && ' \
'ip link delete {interface.device_name} || true'
CMD_CREATE='''
# Create veth pair in the host node
ip link add name {tmp_src} type veth peer name {tmp_dst}
ip link set dev {tmp_src} netns {pid[0]} name {interface.src.device_name}
ip link set dev {tmp_dst} netns {pid[1]} name {interface.dst.device_name}
'''
CMD_UP='''
ip link set dev {interface.device_name} up
'''
class Link(Channel):
"""
Resource: Link
Implements a virtual wired link between containers. It is a VethPair, both
sides of which sit inside a different container.
Because of this, the resource only supports passing source and destination
containers, and not interfaces. It also explains the relative complexity of
the current implementation.
"""
src = Attribute(Interface, description = 'Source interface')
dst = Attribute(Interface, description = 'Destination interface')
capacity = Attribute(Integer, description = 'Link capacity (Mb/s)')
delay = Attribute(String, description = 'Link propagation delay')
src_node = Attribute(Node, description = 'Source node',
mandatory = True)
dst_node = Attribute(Node, description = 'Destination node',
mandatory = True)
def __init__(self, *args, **kwargs):
assert 'src' not in kwargs and 'dst' not in kwargs
assert 'src_node' in kwargs and 'dst_node' in kwargs
super().__init__(*args, **kwargs)
@inline_task
def __initialize__(self):
# We create two managed net devices that are pre-setup
# but the resource manager has to take over for IP addresses etc.
# Being done in initialize, those attributes won't be considered as
# dependencies and will thus not block the resource state machine.
self.src = NonTapBaseNetDevice(node = self.src_node,
device_name = self.dst_node.name,
channel = self,
capacity = self.capacity,
owner = self.owner)
self.dst = NonTapBaseNetDevice(node = self.dst_node,
device_name = self.src_node.name,
channel = self,
capacity = self.capacity,
owner = self.owner)
self.dst.remote = self.src
self.src.remote = self.dst
#--------------------------------------------------------------------------
# Internal methods
#--------------------------------------------------------------------------
async def _commit(self):
manager = self._state.manager
# We mark the src and dst interfaces created because we are pre-setting
# them up in __create__ using a VethPair
# We go through both INITIALIZED and CREATED stats to raise the proper
# events and satisfy any eventual wait_* command.
await manager._set_resource_state(self.src, ResourceState.INITIALIZED)
await manager._set_resource_state(self.dst, ResourceState.INITIALIZED)
await manager._set_resource_state(self.src, ResourceState.CREATED)
await manager._set_resource_state(self.dst, ResourceState.CREATED)
# We mark the attribute clean so that it is not updated
await manager._set_attribute_state(self, 'src', AttributeState.CLEAN)
await manager._set_attribute_state(self, 'dst', AttributeState.CLEAN)
manager.commit_resource(self.src)
manager.commit_resource(self.dst)
# Disable rp_filtering
# self.src.rp_filter = False
# self.dst.rp_filter = False
#XXX VPP
if hasattr(self.src_node, 'vpp') and not self.src_node.vpp is None:
vpp_src = VPPInterface(parent = self.src,
vpp = self.src_node.vpp,
ip_address = Reference(self.src, 'ip_address'),
device_name = 'vpp' + self.src.device_name)
manager.commit_resource(vpp_src)
if hasattr(self.dst_node, 'vpp') and not self.dst_node.vpp is None:
vpp_dst = VPPInterface(parent = self.dst,
vpp = self.dst_node.vpp,
ip_address = Reference(self.dst, 'ip_address'),
device_name = 'vpp' + self.dst.device_name)
manager.commit_resource(vpp_dst)
#--------------------------------------------------------------------------
# Resource lifecycle
#--------------------------------------------------------------------------
@async_task
async def __get__(self):
manager = self._state.manager
try:
await run_task(self.src.__get__(), manager)
await run_task(self.dst.__get__(), manager)
except ResourceNotFound:
# This is raised if any of the two side of the VethPair is missing
raise ResourceNotFound
# We always need to commit the two endpoints so that their attributes
# are correctly updated
await self._commit()
def __create__(self):
assert self.src_node.get_type() == 'lxccontainer'
assert self.dst_node.get_type() == 'lxccontainer'
src_host = self.src_node.node
dst_host = self.dst_node.node
assert src_host == dst_host
host = src_host
# Sometimes a down interface persists on one side
delif_src = BashTask(self.src_node, CMD_DELETE_IF_EXISTS,
{'interface': self.src})
delif_dst = BashTask(self.dst_node, CMD_DELETE_IF_EXISTS,
{'interface': self.dst})
pid_src = get_attributes_task(self.src_node, ['pid'])
pid_dst = get_attributes_task(self.dst_node, ['pid'])
tmp_src = 'tmp-veth-' + ''.join(random.choice(string.ascii_uppercase +
string.digits) for _ in range(5))
tmp_dst = 'tmp-veth-' + ''.join(random.choice(string.ascii_uppercase +
string.digits) for _ in range(5))
create = BashTask(host, CMD_CREATE, {'interface': self,
'tmp_src': tmp_src, 'tmp_dst': tmp_dst})
up_src = BashTask(self.src_node, CMD_UP, {'interface': self.src})
up_dst = BashTask(self.dst_node, CMD_UP, {'interface': self.dst})
@async_task
async def set_state():
# We always need to commit the two endpoints so that their attributes
# are correctly updated
await self._commit()
delif = delif_src | delif_dst
up = up_src | up_dst
pid = pid_src | pid_dst
return ((delif > (pid @ create)) > up) > set_state()
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