Class: OsCtld::NetInterface::Routed

Inherits:
NetInterface::Veth
  • Object
show all
Extended by:
OsCtl::Lib::Utils::System, Utils::Ip
Defined in:
lib/osctld/net_interface/routed.rb

Constant Summary collapse

INTERFACE = 
'osrtr0'.freeze
DEFAULT_IPV4 = 
IPAddress.parse('255.255.255.254/32')

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Utils::Ip

delete_link_by_ifindex, ip, link_ifindex_by_name, tc

Instance Attribute Details

#routes ⇒ Object (readonly)

Returns the value of attribute routes.



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# File 'lib/osctld/net_interface/routed.rb', line 26

def routes
  @routes
end

Class Method Details

.setup ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 14

def self.setup
  begin
    ip(:all, [:link, :show, :dev, INTERFACE])
    return
  rescue SystemCommandFailed => e
    raise if e.rc != 1
  end

  ip(:all, [:link, :add, INTERFACE, :type, :dummy])
  ip(4, [:addr, :add, DEFAULT_IPV4.to_string, :dev, INTERFACE])
end

Instance Method Details

#add_ip(addr, route) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 124

def add_ip(addr, route)
  super(addr)

  v = addr.ipv4? ? 4 : 6
  r = @routes.add(route) if route && !@routes.contains?(route)

  ct.inclusively do
    next if ct.state != :running

    # Add host route
    ip(v, %i[route add] + r.ip_spec + [:dev, veth]) if r && enable

    # Add IP within the CT
    ct_syscmd(
      ct,
      ['ip', "-#{v}", 'addr', 'add', addr.to_string, 'dev', name],
      valid_rcs: [2]
    )

    # Ensure the default route exists
    via = default_via(v)

    ct_syscmd(
      ct,
      ['ip', "-#{v}", 'route', 'add', via.to_s, 'dev', name],
      valid_rcs: [2]
    )
    ct_syscmd(
      ct,
      ['ip', "-#{v}", 'route', 'add', 'default', 'via', via.to_s, 'dev', name],
      valid_rcs: [2]
    )
  end
end

#add_route(addr, via: nil) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 212

def add_route(addr, via: nil)
  route = @routes.add(addr, via:)
  return unless enable

  ct.inclusively do
    next if ct.state != :running

    ip(route.ip_version, %i[route add] + route.ip_spec + [:dev, veth])
  end
end

#can_run_distconfig? ⇒ Boolean

DistConfig can be run only after the interface has been created

Returns:

  • (Boolean) 


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# File 'lib/osctld/net_interface/routed.rb', line 120

def can_run_distconfig?
  exclusively { !veth.nil? && !@host_link_tainted }
end

#create(opts) ⇒ Object

Parameters:

  • opts (Hash)

Options Hash (opts):

  • name (String) 


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# File 'lib/osctld/net_interface/routed.rb', line 30

def create(opts)
  super

  @routes = Routing::Table.new
end

#default_via(v) ⇒ IPAddress::IPv4, IPAddress::IPv6

Parameters:

  • v (4, 6) —

    IP version

Returns:

  • (IPAddress::IPv4, IPAddress::IPv6) 


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# File 'lib/osctld/net_interface/routed.rb', line 250

def default_via(v)
  case v
  when 4
    DEFAULT_IPV4
  when 6
    get_ipv6_link_local
  end
end

#del_all_ips(ip_v, keep_routes) ⇒ Object

Parameters:

  • ip_v (Integer, nil) 


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# File 'lib/osctld/net_interface/routed.rb', line 200

def del_all_ips(ip_v, keep_routes)
  exclusively do
    (ip_v ? [ip_v] : [4, 6]).each do |v|
      @ips[v].clone.each { |addr| del_ip(addr, keep_routes) }
    end
  end
end

#del_all_routes(ip_v = nil) ⇒ Object

Parameters:

  • ip_v (Integer, nil) (defaults to: nil) 


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# File 'lib/osctld/net_interface/routed.rb', line 235

def del_all_routes(ip_v = nil)
  removed = @routes.remove_all(ip_v)
  return unless enable

  ct.inclusively do
    next if ct.state != :running

    removed.each do |route|
      ip(route.ip_version, %i[route del] + route.ip_spec + [:dev, veth])
    end
  end
end

#del_ip(addr, keep_route) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 159

def del_ip(addr, keep_route)
  super(addr)

  routes_to_remove = []
  v = addr.ipv4? ? 4 : 6

  unless keep_route
    r = @routes.remove(addr)
    routes_to_remove << r if r
  end

  # Remove all routes that are routed _via_ `addr`
  @routes.remove_version_if(v) do |route|
    if route.via && route.via.to_s == addr.to_s
      routes_to_remove << route
      true
    else
      false
    end
  end

  ct.inclusively do
    next if ct.state != :running

    # Remove host route
    if enable
      routes_to_remove.each do |route|
        ip(v, %i[route del] + route.ip_spec + [:dev, veth])
      end
    end

    # Remove IP from within the CT
    ct_syscmd(
      ct,
      ['ip', "-#{v}", 'addr', 'del', addr.to_string, 'dev', name],
      valid_rcs: [2]
    )
  end
end

#del_route(addr) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 223

def del_route(addr)
  route = @routes.remove(addr)
  return if !route || !enable

  ct.inclusively do
    next if ct.state != :running

    ip(route.ip_version, %i[route del] + route.ip_spec + [:dev, veth])
  end
end

#dup(new_ct) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 259

def dup(new_ct)
  ret = super
  ret.instance_variable_set('@routes', Routing::Table.load(routes.dump))
  ret
end

#get_ipv6_link_local ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/routed.rb', line 267

def get_ipv6_link_local
  link = exclusively { veth.clone }

  local_ifaddr = Socket.getifaddrs.detect do |ifaddr|
    ifaddr.name == link && ifaddr.addr.ip? && ifaddr.addr.ipv6?
  end

  raise "unable to find link-local IPv6 address for #{veth}" unless local_ifaddr

  IPAddress.parse(local_ifaddr.addr.ip_address.split('%').first)
end

#has_route?(addr) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/net_interface/routed.rb', line 208

def has_route?(addr)
  @routes.contains?(addr)
end

#load(cfg) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 36

def load(cfg)
  super

  @routes = Routing::Table.load(cfg['routes'] || {})
end

#save ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 42

def save
  super.merge({
    'routes' => @routes.dump
  })
end

#set(opts) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 48

def set(opts)
  route_mutation_started = false

  NetInterface.sync_host_link_registry do
    orig_enable = enable

    super

    if veth && opts.has_key?(:enable) && opts[:enable] && !orig_enable
      [4, 6].each do |v|
        next if @routes.empty?(v)

        @routes.each_version(v) do |route|
          route_mutation_started = true
          ip(v, %i[route add] + route.ip_spec + [:dev, veth])
        end
      end
    end
  end
rescue StandardError
  taint_host_link! if route_mutation_started
  raise
end

#setup(discover_host_links: true) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 72

def setup(discover_host_links: true)
  NetInterface.sync_host_link_registry do
    super

    return unless discover_host_links
    # A persisted taint is a fail-closed recovery record. In particular, do
    # not run even read-only name-based host operations against a name which
    # may now belong to an unrelated link.
    return if host_link_tainted?
    return if ct.fresh_state != :running

    iplist = ip(:all, [:addr, :show, :dev, veth], valid_rcs: [1])

    return unless iplist.exitstatus == 1

    log(
      :info,
      ct,
      "veth '#{veth}' of container '#{ct.id}' no longer exists, " \
      'ignoring'
    )
    taint_host_link_on_setup!
    nil
  end
end

#up(veth) ⇒ Object 



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# File 'lib/osctld/net_interface/routed.rb', line 98

def up(veth)
  NetInterface.sync_host_link_registry do
    super(veth)

    if enable
      [4, 6].each do |v|
        next if @routes.empty?(v)

        @routes.each_version(v) do |route|
          ip(v, %i[route add] + route.ip_spec + [:dev, veth])
        end
      end
    end

    File.write(File.join('/proc/sys/net/ipv4/conf', veth, 'rp_filter'), '1')
  rescue StandardError
    taint_host_link!
    raise
  end
end