Class: Dcmgr::VNet::Netfilter::NetfilterController

Inherits:
Controller
  • Object
show all
Includes:
Logger
Defined in:
lib/dcmgr/vnet/netfilter/controller.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logger

create, default_logdev, included

Methods inherited from Controller

#join_security_group, #leave_security_group

Constructor Details

#initialize(node) ⇒ NetfilterController

This controller should use a cache



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 14

def initialize(node)
  logger.info "initializing controller"
  super()
  @node = node
  
  @cache = NetfilterCache.new(@node)
  
  @isolator = IsolatorFactory.create_isolator
  
  self.task_manager = TaskManagerFactory.create_task_manager(node)
  raise "#{self.task_manager} must be a NetfilterTaskManager" unless self.task_manager.is_a?(NetfilterTaskManager)
  
  # Initialize Netfilter configuration
  cmds = []
  cmds << init_iptables if node.manifest.config.enable_iptables
  cmds << init_ebtables if node.manifest.config.enable_ebtables
  cmds.flatten! 
    
  puts cmds.join("\n") if node.manifest.config.verbose_netfilter
  system(cmds.join("\n"))
  
  self.task_manager.apply_tasks([DebugIptables.new]) if node.manifest.config.debug_iptables
  
  # Apply the current instances if there are any
  @cache.get[:instances].each { |inst_map|
    logger.info "initializing instance '#{inst_map[:uuid]}'"
    self.init_instance(inst_map)
  }
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 10

def node
  @node
end

#task_manager ⇒ Object

Returns the value of attribute task_manager.



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 9

def task_manager
  @task_manager
end

Instance Method Details

#apply_instance(instance) ⇒ Object 



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 44

def apply_instance(instance)
  if instance.is_a? String
    # We got a uuid. Find it in the cache.
    inst_map = @cache.get[:instances].find { |inst| inst[:uuid] == instance}

    # If we couldn't find this instance's uuid in the cache, we update the cache and try again
    if inst_map.nil?
      @cache.update
      inst_map = @cache.get[:instances].find { |inst| inst[:uuid] == instance}
    end
  elsif instance.is_a? Hash
    inst_map = instance
  else
    raise ArgumentError, "instance must be either a uuid or an instance's hash map" unless instance.is_a? Hash
  end
  
  logger.info "applying instance '#{inst_map[:uuid]}'"
  
  # Create all the rules for this instance
  init_instance(inst_map)
  
  # Apply isolation tasks for this new instance to its friends
  inst_map[:vif].each { |vnic|
    other_vnics = get_other_vnics(vnic,@cache)
    # Determine which vnics need to be isolated from this one
    friends = @isolator.determine_friends(vnic, other_vnics)
    
    friends.each { |friend|
      # Remove the drop rules so the isolation rules don't ger applied after them
      #self.task_manager.remove_vnic_tasks(friend,TaskFactory.create_drop_tasks_for_vnic(friend,self.node))
      
      # Put in the new isolation rules
      self.task_manager.apply_vnic_tasks(friend,TaskFactory.create_tasks_for_isolation(friend,[vnic],self.node))
      # Put the drop rules back
      #self.task_manager.apply_vnic_tasks(friend,TaskFactory.create_drop_tasks_for_vnic(friend,self.node))
    }
  }
end

#get_other_vnics(vnic, cache) ⇒ Object 



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 83

def get_other_vnics(vnic,cache)
  cache.get[:instances].map { |inst_map|
      inst_map[:vif].delete_if { |other_vnic|
        other_vnic == vnic
    }
  }.flatten
end

#init_instance(inst_map) ⇒ Object 



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 91

def init_instance(inst_map)
  # Call the factory to create all tasks for each vnic. Then apply them
  inst_map[:vif].each { |vnic|
    # Get a list of all other vnics in this host
    other_vnics = get_other_vnics(vnic,@cache)
    
    # Determine which vnics need to be isolated from this one
    friends = @isolator.determine_friends(vnic, other_vnics)
    
    # Determine the security group rules for this vnic
    security_groups = @cache.get[:security_groups].delete_if { |group|
      not vnic[:security_groups].member? group[:uuid]
    }
  
    self.task_manager.apply_vnic_chains(vnic)
    self.task_manager.apply_vnic_tasks(vnic,TaskFactory.create_tasks_for_vnic(vnic,friends,security_groups,node))
  }
end

#remove_instance(inst_id) ⇒ Object 



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 110

def remove_instance(inst_id)
  logger.info "removing instance '#{inst_id}'"
  # Find the instance in the cache
  inst_map = @cache.get[:instances].find { |inst| inst[:uuid] == inst_id}
  
  #Clean up the isolation tasks in friends' chains
  inst_map[:vif].each { |vnic|
    other_vnics = get_other_vnics(vnic,@cache)
    friends = @isolator.determine_friends(vnic, other_vnics)
    
    friends.each { |friend|
      self.task_manager.remove_vnic_tasks(friend,TaskFactory.create_tasks_for_isolation(friend,[vnic],self.node))
    }
  }
  
  inst_map[:vif].each { |vnic|
    # Removing the nat tasks separately because they include an arp reply
    # that isn't put in a separate chain
    other_vnics = get_other_vnics(vnic,@cache)
    # Determine which vnics need to be isolated from this one
    friends = @isolator.determine_friends(vnic, other_vnics)
    
    self.task_manager.remove_vnic_tasks(vnic, TaskFactory.create_nat_tasks_for_vnic(vnic,self.node) )
    self.task_manager.remove_vnic_chains(vnic)
  }
  
  # Remove the terminated instance from the cache
  @cache.remove_instance(inst_id)
end

#update_security_group(group) ⇒ Object 



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# File 'lib/dcmgr/vnet/netfilter/controller.rb', line 140

def update_security_group(group)
  logger.info "updating security group '#{group}'"
  # Get the old security group info from the cache
  old_cache = @cache.get
  
  # Get a list of vnics that are in this security group
  vnics = old_cache[:instances].map {|inst_map| inst_map[:vif].delete_if { |vnic| not vnic[:security_groups].member?(group) } }.flatten
  unless vnics.empty?
    # Get the rules for this security group
    old_group = old_cache[:security_groups].find {|sg| sg[:uuid] == group}
  
    # Get the new info from the cache
    new_cache = @cache.get(true)
    new_group = new_cache[:security_groups].find {|sg| sg[:uuid] == group}
    
    vnics.each { |vnic_map|
      # Remove the old security group tasks
      self.task_manager.remove_vnic_tasks(vnic_map, TaskFactory.create_tasks_for_secgroup(old_group))
      
      # Remove the drop tasks so the new group's tasks don't get applied behind it
      #self.task_manager.remove_vnic_tasks(vnic_map, TaskFactory.create_drop_tasks_for_vnic(vnic_map,self.node))
      # Add the new security group tasks
      self.task_manager.apply_vnic_tasks(vnic_map, TaskFactory.create_tasks_for_secgroup(new_group))
      # Put the drop tasks back in place
      #self.task_manager.apply_vnic_tasks(vnic_map, TaskFactory.create_drop_tasks_for_vnic(vnic_map,self.node))
    }
  end
end