resources/libraries/python/IPv4Setup.py

   1 # Copyright (c) 2016 Cisco and/or its affiliates.
   2 # Licensed under the Apache License, Version 2.0 (the "License");
   3 # you may not use this file except in compliance with the License.
   4 # You may obtain a copy of the License at:
   5 #
   6 #     http://www.apache.org/licenses/LICENSE-2.0
   7 #
   8 # Unless required by applicable law or agreed to in writing, software
   9 # distributed under the License is distributed on an "AS IS" BASIS,
  10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  11 # See the License for the specific language governing permissions and
  12 # limitations under the License.
  13
  14 """IPv4 setup library"""
  15
  16 from socket import inet_ntoa
  17 from struct import pack
  18 from abc import ABCMeta, abstractmethod
  19
  20 from robot.api.deco import keyword
  21
  22 from resources.libraries.python.ssh import exec_cmd_no_error
  23 from resources.libraries.python.Routing import Routing
  24 from resources.libraries.python.topology import NodeType, Topology
  25 from resources.libraries.python.VatExecutor import VatExecutor
  26
  27
  28 class IPv4Node(object):
  29     """Abstract class of a node in a topology."""
  30     __metaclass__ = ABCMeta
  31
  32     def __init__(self, node_info):
  33         self.node_info = node_info
  34
  35     @staticmethod
  36     def _get_netmask(prefix_length):
  37         bits = 0xffffffff ^ (1 << 32 - prefix_length) - 1
  38         return inet_ntoa(pack('>I', bits))
  39
  40     @abstractmethod
  41     def set_ip(self, interface, address, prefix_length):
  42         """Configure IPv4 address on interface.
  43
  44         :param interface: Interface name.
  45         :param address: IPv4 address.
  46         :param prefix_length: IPv4 prefix length.
  47         :type interface: str
  48         :type address: str
  49         :type prefix_length: int
  50         :return: nothing
  51         """
  52         pass
  53
  54     @abstractmethod
  55     def set_route(self, network, prefix_length, gateway, interface):
  56         """Configure IPv4 route.
  57
  58         :param network: Network IPv4 address.
  59         :param prefix_length: IPv4 prefix length.
  60         :param gateway: IPv4 address of the gateway.
  61         :param interface: Interface name.
  62         :type network: str
  63         :type prefix_length: int
  64         :type gateway: str
  65         :type interface: str
  66         :return: nothing
  67         """
  68         pass
  69
  70     @abstractmethod
  71     def unset_route(self, network, prefix_length, gateway, interface):
  72         """Remove specified IPv4 route.
  73
  74         :param network: Network IPv4 address.
  75         :param prefix_length: IPv4 prefix length.
  76         :param gateway: IPv4 address of the gateway.
  77         :param interface: Interface name.
  78         :type network: str
  79         :type prefix_length: int
  80         :type gateway: str
  81         :type interface: str
  82         :return: nothing
  83         """
  84         pass
  85
  86     @abstractmethod
  87     def flush_ip_addresses(self, interface):
  88         """Flush all IPv4 addresses from specified interface.
  89
  90         :param interface: Interface name.
  91         :type interface: str
  92         :return: nothing
  93         """
  94         pass
  95
  96     @abstractmethod
  97     def ping(self, destination_address, source_interface):
  98         """Send an ICMP request to destination node.
  99
 100         :param destination_address: Address to send the ICMP request.
 101         :param source_interface: Source interface name.
 102         :type destination_address: str
 103         :type source_interface: str
 104         :return: nothing
 105         """
 106         pass
 107
 108
 109 class Tg(IPv4Node):
 110     """Traffic generator node"""
 111     def __init__(self, node_info):
 112         super(Tg, self).__init__(node_info)
 113
 114     def _execute(self, cmd):
 115         return exec_cmd_no_error(self.node_info, cmd)
 116
 117     def _sudo_execute(self, cmd):
 118         return exec_cmd_no_error(self.node_info, cmd, sudo=True)
 119
 120     def set_ip(self, interface, address, prefix_length):
 121         cmd = 'ip -4 addr flush dev {}'.format(interface)
 122         self._sudo_execute(cmd)
 123         cmd = 'ip addr add {}/{} dev {}'.format(address, prefix_length,
 124                                                 interface)
 125         self._sudo_execute(cmd)
 126
 127     def set_route(self, network, prefix_length, gateway, interface):
 128         netmask = self._get_netmask(prefix_length)
 129         cmd = 'route add -net {} netmask {} gw {}'.\
 130             format(network, netmask, gateway)
 131         self._sudo_execute(cmd)
 132
 133     def unset_route(self, network, prefix_length, gateway, interface):
 134         self._sudo_execute('ip route delete {}/{}'.
 135                            format(network, prefix_length))
 136
 137     def arp_ping(self, destination_address, source_interface):
 138         self._sudo_execute('arping -c 1 -I {} {}'.format(source_interface,
 139                                                          destination_address))
 140
 141     def ping(self, destination_address, source_interface):
 142         self._execute('ping -c 1 -w 5 -I {} {}'.format(source_interface,
 143                                                        destination_address))
 144
 145     def flush_ip_addresses(self, interface):
 146         self._sudo_execute('ip addr flush dev {}'.format(interface))
 147
 148
 149 class Dut(IPv4Node):
 150     """Device under test"""
 151     def __init__(self, node_info):
 152         super(Dut, self).__init__(node_info)
 153
 154     def get_sw_if_index(self, interface):
 155         """Get sw_if_index of specified interface from current node.
 156
 157         :param interface: Interface name.
 158         :type interface: str
 159         :return: sw_if_index of the interface or None.
 160         :rtype: int
 161         """
 162         return Topology().get_interface_sw_index(self.node_info, interface)
 163
 164     def exec_vat(self, script, **args):
 165         """Wrapper for VAT executor.
 166
 167         :param script: Script to execute.
 168         :param args: Parameters to the script.
 169         :type script: str
 170         :type args: dict
 171         :return: nothing
 172         """
 173         # TODO: check return value
 174         VatExecutor.cmd_from_template(self.node_info, script, **args)
 175
 176     def set_arp(self, iface_key, ip_address, mac_address):
 177         """Set entry in ARP cache.
 178
 179         :param iface_key: Interface key.
 180         :param ip_address: IP address.
 181         :param mac_address: MAC address.
 182         :type iface_key: str
 183         :type ip_address: str
 184         :type mac_address: str
 185         """
 186         self.exec_vat('add_ip_neighbor.vat',
 187                       sw_if_index=self.get_sw_if_index(iface_key),
 188                       ip_address=ip_address, mac_address=mac_address)
 189
 190     def set_ip(self, interface, address, prefix_length):
 191         self.exec_vat('add_ip_address.vat',
 192                       sw_if_index=self.get_sw_if_index(interface),
 193                       address=address, prefix_length=prefix_length)
 194
 195     def set_route(self, network, prefix_length, gateway, interface):
 196         Routing.vpp_route_add(self.node_info,
 197                               network=network, prefix_len=prefix_length,
 198                               gateway=gateway, interface=interface)
 199
 200     def unset_route(self, network, prefix_length, gateway, interface):
 201         self.exec_vat('del_route.vat', network=network,
 202                       prefix_length=prefix_length, gateway=gateway,
 203                       sw_if_index=self.get_sw_if_index(interface))
 204
 205     def arp_ping(self, destination_address, source_interface):
 206         pass
 207
 208     def flush_ip_addresses(self, interface):
 209         self.exec_vat('flush_ip_addresses.vat',
 210                       sw_if_index=self.get_sw_if_index(interface))
 211
 212     def ping(self, destination_address, source_interface):
 213         pass
 214
 215
 216 def get_node(node_info):
 217     """Creates a class instance derived from Node based on type.
 218
 219     :param node_info: Dictionary containing information on nodes in topology.
 220     :type node_info: dict
 221     :return: Class instance that is derived from Node.
 222     """
 223     if node_info['type'] == NodeType.TG:
 224         return Tg(node_info)
 225     elif node_info['type'] == NodeType.DUT:
 226         return Dut(node_info)
 227     else:
 228         raise NotImplementedError('Node type "{}" unsupported!'.
 229                                   format(node_info['type']))
 230
 231
 232 class IPv4Setup(object):
 233     """IPv4 setup in topology."""
 234
 235     @staticmethod
 236     def vpp_nodes_set_ipv4_addresses(nodes, nodes_addr):
 237         """Set IPv4 addresses on all VPP nodes in topology.
 238
 239         :param nodes: Nodes of the test topology.
 240         :param nodes_addr: Available nodes IPv4 addresses.
 241         :type nodes: dict
 242         :type nodes_addr: dict
 243         :return: Affected interfaces as list of (node, interface) tuples.
 244         :rtype: list
 245         """
 246         interfaces = []
 247         for net in nodes_addr.values():
 248             for port in net['ports'].values():
 249                 host = port.get('node')
 250                 if host is None:
 251                     continue
 252                 topo = Topology()
 253                 node = topo.get_node_by_hostname(nodes, host)
 254                 if node is None:
 255                     continue
 256                 if node['type'] != NodeType.DUT:
 257                     continue
 258                 iface_key = topo.get_interface_by_name(node, port['if'])
 259                 get_node(node).set_ip(iface_key, port['addr'], net['prefix'])
 260                 interfaces.append((node, port['if']))
 261
 262         return interfaces
 263
 264     @staticmethod
 265     @keyword('Get IPv4 address of node "${node}" interface "${port}" '
 266              'from "${nodes_addr}"')
 267     def get_ip_addr(node, iface_key, nodes_addr):
 268         """Return IPv4 address of the node port.
 269
 270         :param node: Node in the topology.
 271         :param iface_key: Interface key of the node.
 272         :param nodes_addr: Nodes IPv4 addresses.
 273         :type node: dict
 274         :type iface_key: str
 275         :type nodes_addr: dict
 276         :return: IPv4 address.
 277         :rtype: str
 278         """
 279         interface = Topology.get_interface_name(node, iface_key)
 280         for net in nodes_addr.values():
 281             for port in net['ports'].values():
 282                 host = port.get('node')
 283                 dev = port.get('if')
 284                 if host == node['host'] and dev == interface:
 285                     ip = port.get('addr')
 286                     if ip is not None:
 287                         return ip
 288                     else:
 289                         raise Exception(
 290                             'Node {n} port {p} IPv4 address is not set'.format(
 291                                 n=node['host'], p=interface))
 292
 293         raise Exception('Node {n} port {p} IPv4 address not found.'.format(
 294             n=node['host'], p=interface))
 295
 296     @staticmethod
 297     def setup_arp_on_all_duts(nodes_info, nodes_addr):
 298         """For all DUT nodes extract MAC and IP addresses of adjacent
 299         interfaces from topology and use them to setup ARP entries.
 300
 301         :param nodes_info: Dictionary containing information on all nodes
 302         in topology.
 303         :param nodes_addr: Nodes IPv4 addresses.
 304         :type nodes_info: dict
 305         :type nodes_addr: dict
 306         """
 307         for node in nodes_info.values():
 308             if node['type'] == NodeType.TG:
 309                 continue
 310             for iface_key in node['interfaces'].keys():
 311                 adj_node, adj_int = Topology.\
 312                     get_adjacent_node_and_interface(nodes_info, node, iface_key)
 313                 ip_address = IPv4Setup.get_ip_addr(adj_node, adj_int,
 314                                                    nodes_addr)
 315                 mac_address = Topology.get_interface_mac(adj_node, adj_int)
 316                 get_node(node).set_arp(iface_key, ip_address, mac_address)
 317
 318     @staticmethod
 319     def add_arp_on_dut(node, iface_key, ip_address, mac_address):
 320         """Set ARP cache entree on DUT node.
 321
 322         :param node: VPP Node in the topology.
 323         :param iface_key: Interface key.
 324         :param ip_address: IP address of the interface.
 325         :param mac_address: MAC address of the interface.
 326         :type node: dict
 327         :type iface_key: str
 328         :type ip_address: str
 329         :type mac_address: str
 330         """
 331         get_node(node).set_arp(iface_key, ip_address, mac_address)