Class: OsCtld::NetInterface::Veth

Inherits:
Base
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log, OsCtl::Lib::Utils::System, Utils::Ip, Utils::SwitchUser
Defined in:
lib/osctld/net_interface/veth.rb

Direct Known Subclasses

Bridge, Routed

Instance Attribute Summary collapse

Attributes inherited from Base

#ct, #hwaddr, #index, #max_rx, #max_tx, #name

Instance Method Summary collapse

Methods included from Utils::SwitchUser

#ct_attach, #ct_syscmd

Methods included from Utils::Ip

#ip, #tc

Methods inherited from Base

#can_add_ip?, #can_run_distconfig?, #initialize, #is_down?, setup, type, #type

Methods included from Lockable

#exclusively, included, #inclusively, #init_lock, #lock, #unlock

Constructor Details

This class inherits a constructor from OsCtld::NetInterface::Base

Instance Attribute Details

#rx_queues ⇒ Integer (readonly)

Number of receive queues

Returns:

  • (Integer) 


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# File 'lib/osctld/net_interface/veth.rb', line 19

def rx_queues
  @rx_queues
end

#tx_queues ⇒ Integer (readonly)

Number of transmit queues

Returns:

  • (Integer) 


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# File 'lib/osctld/net_interface/veth.rb', line 15

def tx_queues
  @tx_queues
end

#veth ⇒ Object (readonly)

Returns the value of attribute veth.



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# File 'lib/osctld/net_interface/veth.rb', line 11

def veth
  @veth
end

Instance Method Details

#active_ip_versions ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 202

def active_ip_versions
  inclusively { [4, 6].delete_if { |v| @ips[v].empty? } }
end

#add_ip(addr) ⇒ Object

Parameters:

  • addr (IPAddress) 


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# File 'lib/osctld/net_interface/veth.rb', line 225

def add_ip(addr)
  exclusively { @ips[addr.ipv4? ? 4 : 6] << addr }
end

#create(opts) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 21

def create(opts)
  super

  @tx_queues = opts.fetch(:tx_queues, 1)
  @rx_queues = opts.fetch(:rx_queues, 1)
  @ips = { 4 => [], 6 => [] }
end

#del_all_ips(ip_v = nil) ⇒ Object

Parameters:

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


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

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

#del_ip(addr) ⇒ Object

Parameters:

  • addr (IPAddress) 


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# File 'lib/osctld/net_interface/veth.rb', line 230

def del_ip(addr)
  exclusively { @ips[addr.ipv4? ? 4 : 6].delete_if { |v| v == addr } }
end

#down(host_veth = nil) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 166

def down(host_veth = nil)
  veth_name = host_veth || veth
  ifb_name = ifb_veth

  exclusively { @veth = nil }

  # lxc-user-nic does not support deletion of veth interfaces, delete it ourselves
  log(:info, ct, "Removing host veth #{veth_name}")

  begin
    ip(:all, %W[link del #{veth_name}])
  rescue SystemCommandFailed => e
    log(:warn, ct, "Unable to delete host veth #{veth_name}: #{e.message}")
  end

  if max_tx > 0
    begin
      ip(:all, %W[link del #{ifb_name}])
    rescue SystemCommandFailed => e
      log(:warn, ct, "Unable to delete ifb host veth #{ifb_name}: #{e.message}")
    end
  end

  Eventd.report(
    :ct_netif,
    action: :down,
    pool: ct.pool.name,
    id: ct.id,
    name:
  )
end

#dup(new_ct) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 243

def dup(new_ct)
  ret = super
  ret.instance_variable_set('@veth', nil)
  ret
end

#fetch_veth_name ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 251

def fetch_veth_name
  v = ContainerControl::Commands::VethName.run!(ct, index)
  log(:info, ct, "Discovered name for veth ##{index}: #{v}")
  v
end

#has_ip?(addr, prefix: true) ⇒ Boolean

Parameters:

  • addr (IPAddress)
  • prefix (Boolean) (defaults to: true) —

    check also address prefix

Returns:

  • (Boolean) 


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

def has_ip?(addr, prefix: true)
  ip_v = addr.ipv4? ? 4 : 6

  exclusively do
    if prefix
      @ips[ip_v].include?(addr)
    else
      @ips[ip_v].detect { |v| v.to_s == addr.to_s } ? true : false
    end
  end
end

#hook_path(mode, name = nil) ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 302

def hook_path(mode, name = nil)
  File.join(mode_path(mode), "#{@ct.id}.#{name || self.name}")
end

#ifb_veth ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 257

def ifb_veth
  "ifb#{veth}"
end

#ips(v) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 206

def ips(v)
  inclusively { @ips[v].clone }
end

#is_up? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/net_interface/veth.rb', line 198

def is_up?
  inclusively { !veth.nil? }
end

#load(cfg) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 29

def load(cfg)
  super

  @tx_queues = cfg.fetch('tx_queues', 1)
  @rx_queues = cfg.fetch('rx_queues', 1)

  @ips = if cfg['ip_addresses']
           load_ip_list(cfg['ip_addresses']) do |ips|
             ips.map { |ip| IPAddress.parse(ip) }
           end

         else
           { 4 => [], 6 => [] }
         end
end

#load_ip_list(ip_list) {|value| ... } ⇒ Hash<Integer, String>, Hash<Integer, Array<String>> (protected)

Take an IP list stored in a config file and return an internal representation, see ##save_ip_list.

Yield Parameters:

  • value (String, Array<String>)

Returns:

  • (Hash<Integer, String>, Hash<Integer, Array<String>>) 


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# File 'lib/osctld/net_interface/veth.rb', line 329

def load_ip_list(ip_list)
  ip_list.to_h do |ip_v, value|
    # Load also integer keys for backward compatibility
    if [4, 6].include?(ip_v)
      [ip_v, yield(value)]

    elsif /^v(4|6)$/ =~ ip_v
      [::Regexp.last_match(1).to_i, yield(value)]

    else
      raise "unsupported IP version '#{ip_v}': expected v4 or v6"
    end
  end
end

#mode_path(mode) ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 298

def mode_path(mode)
  File.join(veth_hook_dir, mode)
end

#rename(new_name) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 122

def rename(new_name)
  %w[up down].each do |v|
    begin
      File.unlink(hook_path(v, name))
    rescue Errno::ENOENT
      # pass
    end

    File.symlink(OsCtld.hook_src("veth-#{v}"), hook_path(v, new_name))
  end

  super
end

#render_opts ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 136

def render_opts
  inclusively do
    {
      name:,
      index:,
      hwaddr:,
      tx_queues:,
      rx_queues:,
      hook_veth_up: hook_path('up'),
      hook_veth_down: hook_path('down')
    }
  end
end

#save ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 45

def save
  inclusively do
    super.merge(
      'tx_queues' => tx_queues,
      'rx_queues' => rx_queues,
      'ip_addresses' => save_ip_list(@ips) { |v| v.map(&:to_string) }
    )
  end
end

#save_ip_list(ip_list) {|value| ... } ⇒ Hash<String, String>, Hash<String, Array<String>> (protected)

Take an internal representation of an IP list and return a version to store in the config file.

The internal representation is a hash, where keys are IP versions as integer and the yielded value is either a list of addresses, i.e. an array of string, or just one address (string). The caller decides how to encode the value.

The returned hash has IP versions in the hash encoded as strings, i.e. ‘v4` or v6`. This is to allow storing the config in JSON, which does not support integer object keys.

Yield Parameters:

  • value (String, Array<String>)

Returns:

  • (Hash<String, String>, Hash<String, Array<String>>) 


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# File 'lib/osctld/net_interface/veth.rb', line 320

def save_ip_list(ip_list)
  ip_list.to_h { |ip_v, value| ["v#{ip_v}", yield(value)] }
end

#set(opts) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 55

def set(opts)
  @tx_queues = opts[:tx_queues] if opts[:tx_queues]
  @rx_queues = opts[:rx_queues] if opts[:rx_queues]

  orig_max_rx = max_rx
  orig_max_tx = max_tx

  # max_tx/rx is assigned by the parent
  super

  return if veth.nil?

  if opts[:max_rx] && opts[:max_rx] != orig_max_rx
    if max_rx > 0
      set_shaper_rx
    else
      unset_shaper_rx
    end
  end

  return unless opts[:max_tx] && opts[:max_tx] != orig_max_tx

  if max_tx > 0
    set_shaper_tx
  else
    unset_shaper_tx
  end
end

#set_shaper_rx ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 261

def set_shaper_rx
  tc(%W[qdisc delete root dev #{veth}], valid_rcs: [2])
  tc(%W[qdisc add root dev #{veth} cake bandwidth #{max_rx}bit])
end

#set_shaper_tx ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 270

def set_shaper_tx
  ifb_exists = Dir.exist?("/sys/devices/virtual/net/#{ifb_veth}")

  unless ifb_exists
    ip(:all, %W[link add name #{ifb_veth} type ifb])
    tc(%W[qdisc del dev #{veth} ingress], valid_rcs: [2])
    tc(%W[qdisc add dev #{veth} handle ffff: ingress])
  end

  tc(%W[qdisc del dev #{ifb_veth} root], valid_rcs: [2])
  tc(%W[qdisc add dev #{ifb_veth} root cake bandwidth #{max_tx}bit besteffort])

  return if ifb_exists

  ip(:all, %W[link set #{ifb_veth} up])
  tc(%W[filter add dev #{veth} parent ffff: matchall action mirred egress redirect dev #{ifb_veth}])
end

#setup ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 84

def setup
  # Setup links for veth up/down hooks in rundir
  #
  # Because a CT can have multiple veth interfaces and they can be of
  # different types, we need to create hooks for specific veth interfaces,
  # so that we can identify which veth was the hook called for. We simply
  # symlink the hook to rundir and the symlink's name identifies the veth.
  begin
    Dir.mkdir(veth_hook_dir, 0o711)
  rescue Errno::EEXIST
    # ignore
  end

  %w[up down].each do |v|
    begin
      Dir.mkdir(mode_path(v), 0o711)
    rescue Errno::EEXIST
      # ignore
    end

    symlink = hook_path(v)
    hook_src = OsCtld.hook_src("veth-#{v}")

    if File.symlink?(symlink)
      next if File.readlink(symlink) == hook_src

      File.unlink(symlink)

    end

    File.symlink(hook_src, symlink)
  end

  return if ct.fresh_state != :running

  @veth = fetch_veth_name
end

#unset_shaper_rx ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 266

def unset_shaper_rx
  tc(%W[qdisc delete root dev #{veth}], valid_rcs: [2])
end

#unset_shaper_tx ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 288

def unset_shaper_tx
  tc(%W[filter delete dev #{veth} parent ffff:])
  tc(%W[qdisc delete dev #{veth} handle ffff: ingress])
  ip(:all, %W[link del #{ifb_veth}])
end

#up(veth) ⇒ Object 



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# File 'lib/osctld/net_interface/veth.rb', line 150

def up(veth)
  exclusively { @veth = veth }

  set_shaper_rx if max_rx > 0
  set_shaper_tx if max_tx > 0

  Eventd.report(
    :ct_netif,
    action: :up,
    pool: ct.pool.name,
    id: ct.id,
    name:,
    veth:
  )
end

#veth_hook_dir ⇒ Object (protected) 



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# File 'lib/osctld/net_interface/veth.rb', line 294

def veth_hook_dir
  File.join(ct.pool.hook_dir, 'veth')
end