# Copyright (c) 2020 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. """Common IP utilities library.""" import re from enum import IntEnum from ipaddress import ip_address from resources.libraries.python.Constants import Constants from resources.libraries.python.InterfaceUtil import InterfaceUtil from resources.libraries.python.IPAddress import IPAddress from resources.libraries.python.PapiExecutor import PapiSocketExecutor from resources.libraries.python.ssh import exec_cmd_no_error, exec_cmd from resources.libraries.python.topology import Topology from resources.libraries.python.VatExecutor import VatTerminal from resources.libraries.python.Namespaces import Namespaces # from vpp/src/vnet/vnet/mpls/mpls_types.h MPLS_IETF_MAX_LABEL = 0xfffff MPLS_LABEL_INVALID = MPLS_IETF_MAX_LABEL + 1 class FibPathType(IntEnum): """FIB path types.""" FIB_PATH_TYPE_NORMAL = 0 FIB_PATH_TYPE_LOCAL = 1 FIB_PATH_TYPE_DROP = 2 FIB_PATH_TYPE_UDP_ENCAP = 3 FIB_PATH_TYPE_BIER_IMP = 4 FIB_PATH_TYPE_ICMP_UNREACH = 5 FIB_PATH_TYPE_ICMP_PROHIBIT = 6 FIB_PATH_TYPE_SOURCE_LOOKUP = 7 FIB_PATH_TYPE_DVR = 8 FIB_PATH_TYPE_INTERFACE_RX = 9 FIB_PATH_TYPE_CLASSIFY = 10 class FibPathFlags(IntEnum): """FIB path flags.""" FIB_PATH_FLAG_NONE = 0 # TODO: Name too long for pylint, fix in VPP. FIB_PATH_FLAG_RESOLVE_VIA_ATTACHED = 1 FIB_PATH_FLAG_RESOLVE_VIA_HOST = 2 class FibPathNhProto(IntEnum): """FIB path next-hop protocol.""" FIB_PATH_NH_PROTO_IP4 = 0 FIB_PATH_NH_PROTO_IP6 = 1 FIB_PATH_NH_PROTO_MPLS = 2 FIB_PATH_NH_PROTO_ETHERNET = 3 FIB_PATH_NH_PROTO_BIER = 4 class IPUtil: """Common IP utilities""" @staticmethod def ip_to_int(ip_str): """Convert IP address from string format (e.g. 10.0.0.1) to integer representation (167772161). :param ip_str: IP address in string representation. :type ip_str: str :returns: Integer representation of IP address. :rtype: int """ return int(ip_address(ip_str)) @staticmethod def int_to_ip(ip_int): """Convert IP address from integer representation (e.g. 167772161) to string format (10.0.0.1). :param ip_int: IP address in integer representation. :type ip_int: int :returns: String representation of IP address. :rtype: str """ return str(ip_address(ip_int)) @staticmethod def vpp_get_interface_ip_addresses(node, interface, ip_version): """Get list of IP addresses from an interface on a VPP node. :param node: VPP node. :param interface: Name of an interface on the VPP node. :param ip_version: IP protocol version (ipv4 or ipv6). :type node: dict :type interface: str :type ip_version: str :returns: List of dictionaries, each containing IP address, subnet prefix length and also the subnet mask for ipv4 addresses. Note: A single interface may have multiple IP addresses assigned. :rtype: list """ sw_if_index = InterfaceUtil.get_interface_index(node, interface) if not sw_if_index: return list() cmd = u"ip_address_dump" args = dict( sw_if_index=sw_if_index, is_ipv6=bool(ip_version == u"ipv6") ) err_msg = f"Failed to get L2FIB dump on host {node[u'host']}" with PapiSocketExecutor(node) as papi_exec: details = papi_exec.add(cmd, **args).get_details(err_msg) # TODO: CSIT currently looks only whether the list is empty. # Add proper value processing if values become important. return details @staticmethod def vpp_get_ip_tables(node): """Get dump of all IP FIB tables on a VPP node. :param node: VPP node. :type node: dict """ PapiSocketExecutor.run_cli_cmd(node, u"show ip fib") PapiSocketExecutor.run_cli_cmd(node, u"show ip fib summary") PapiSocketExecutor.run_cli_cmd(node, u"show ip6 fib") PapiSocketExecutor.run_cli_cmd(node, u"show ip6 fib summary") @staticmethod def vpp_get_ip_tables_prefix(node, address): """Get dump of all IP FIB tables on a VPP node. :param node: VPP node. :param address: IP address. :type node: dict :type address: str """ addr = ip_address(address) ip_ver = u"ip6" if addr.version == 6 else u"ip" PapiSocketExecutor.run_cli_cmd( node, f"show {ip_ver} fib {addr}/{addr.max_prefixlen}" ) @staticmethod def get_interface_vrf_table(node, interface, ip_version='ipv4'): """Get vrf ID for the given interface. :param node: VPP node. :param interface: Name or sw_if_index of a specific interface. :type node: dict :param ip_version: IP protocol version (ipv4 or ipv6). :type interface: str or int :type ip_version: str :returns: vrf ID of the specified interface. :rtype: int """ sw_if_index = InterfaceUtil.get_interface_index(node, interface) cmd = u"sw_interface_get_table" args = dict( sw_if_index=sw_if_index, is_ipv6=bool(ip_version == u"ipv6") ) err_msg = f"Failed to get VRF id assigned to interface {interface}" with PapiSocketExecutor(node) as papi_exec: reply = papi_exec.add(cmd, **args).get_reply(err_msg) return reply[u"vrf_id"] @staticmethod def vpp_ip_source_check_setup(node, if_name): """Setup Reverse Path Forwarding source check on interface. :param node: VPP node. :param if_name: Interface name to setup RPF source check. :type node: dict :type if_name: str """ cmd = u"ip_source_check_interface_add_del" args = dict( sw_if_index=InterfaceUtil.get_interface_index(node, if_name), is_add=1, loose=0 ) err_msg = f"Failed to enable source check on interface {if_name}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg) @staticmethod def vpp_ip_probe(node, interface, addr): """Run ip probe on VPP node. :param node: VPP node. :param interface: Interface key or name. :param addr: IPv4/IPv6 address. :type node: dict :type interface: str :type addr: str """ cmd = u"ip_probe_neighbor" args = dict( sw_if_index=InterfaceUtil.get_interface_index(node, interface), dst=str(addr) ) err_msg = f"VPP ip probe {interface} {addr} failed on {node[u'host']}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg) @staticmethod def ip_addresses_should_be_equal(ip1, ip2): """Fails if the given IP addresses are unequal. :param ip1: IPv4 or IPv6 address. :param ip2: IPv4 or IPv6 address. :type ip1: str :type ip2: str """ addr1 = ip_address(ip1) addr2 = ip_address(ip2) if addr1 != addr2: raise AssertionError(f"IP addresses are not equal: {ip1} != {ip2}") @staticmethod def setup_network_namespace(node, namespace_name, interface_name, ip_addr_list, prefix_length): """Setup namespace on given node and attach interface and IP to this namespace. Applicable also on TG node. :param node: VPP node. :param namespace_name: Namespace name. :param interface_name: Interface name. :param ip_addr_list: List of IP addresses of namespace's interface. :param prefix_length: IP address prefix length. :type node: dict :type namespace_name: str :type interface_name: str :type ip_addr_list: list :type prefix_length: int """ Namespaces.create_namespace(node, namespace_name) cmd = f"ip netns exec {namespace_name} ip link set {interface_name} up" exec_cmd_no_error(node, cmd, sudo=True) for ip_addr in ip_addr_list: cmd = f"ip netns exec {namespace_name} ip addr add " \ f"{ip_addr}/{prefix_length} dev {interface_name}" exec_cmd_no_error(node, cmd, sudo=True) @staticmethod def linux_enable_forwarding(node, ip_ver=u"ipv4"): """Enable forwarding on a Linux node, e.g. VM. :param node: VPP node. :param ip_ver: IP version, 'ipv4' or 'ipv6'. :type node: dict :type ip_ver: str """ cmd = f"sysctl -w net.{ip_ver}.ip_forward=1" exec_cmd_no_error(node, cmd, sudo=True) @staticmethod def get_linux_interface_name(node, pci_addr): """Get the interface name. :param node: VPP/TG node. :param pci_addr: PCI address :type node: dict :type pci_addr: str :returns: Interface name :rtype: str :raises RuntimeError: If cannot get the information about interfaces. """ regex_intf_info = \ r"pci@([0-9a-f]{4}:[0-9a-f]{2}:[0-9a-f]{2}.[0-9a-f])\s" \ r"*([a-zA-Z0-9]*)\s*network" cmd = u"lshw -class network -businfo" ret_code, stdout, stderr = exec_cmd(node, cmd, timeout=30, sudo=True) if ret_code != 0: raise RuntimeError( f"Could not get information about interfaces:\n{stderr}" ) for line in stdout.splitlines()[2:]: try: if re.search(regex_intf_info, line).group(1) == pci_addr: return re.search(regex_intf_info, line).group(2) except AttributeError: continue return None @staticmethod def set_linux_interface_up(node, interface): """Set the specified interface up. :param node: VPP/TG node. :param interface: Interface in namespace. :type node: dict :type interface: str :raises RuntimeError: If the interface could not be set up. """ cmd = f"ip link set {interface} up" exec_cmd_no_error(node, cmd, timeout=30, sudo=True) @staticmethod def set_linux_interface_ip( node, interface, ip_addr, prefix, namespace=None): """Set IP address to interface in linux. :param node: VPP/TG node. :param interface: Interface in namespace. :param ip_addr: IP to be set on interface. :param prefix: IP prefix. :param namespace: Execute command in namespace. Optional :type node: dict :type interface: str :type ip_addr: str :type prefix: int :type namespace: str :raises RuntimeError: IP could not be set. """ if namespace is not None: cmd = f"ip netns exec {namespace} ip addr add {ip_addr}/{prefix}" \ f" dev {interface}" else: cmd = f"ip addr add {ip_addr}/{prefix} dev {interface}" exec_cmd_no_error(node, cmd, timeout=5, sudo=True) @staticmethod def delete_linux_interface_ip( node, interface, ip_addr, prefix_length, namespace=None): """Delete IP address from interface in linux. :param node: VPP/TG node. :param interface: Interface in namespace. :param ip_addr: IP to be deleted from interface. :param prefix_length: IP prefix length. :param namespace: Execute command in namespace. Optional :type node: dict :type interface: str :type ip_addr: str :type prefix_length: int :type namespace: str :raises RuntimeError: IP could not be deleted. """ # TODO: Refactor command execution in namespaces into central # methods (e.g. Namespace.exec_cmd_in_namespace) if namespace is not None: cmd = f"ip netns exec {namespace} ip addr del " \ f"{ip_addr}/{prefix_length} dev {interface}" else: cmd = f"ip addr del {ip_addr}/{prefix_length} dev {interface}" exec_cmd_no_error(node, cmd, timeout=5, sudo=True) @staticmethod def linux_interface_has_ip( node, interface, ip_addr, prefix_length, namespace=None): """Return True if interface in linux has IP address. :param node: VPP/TG node. :param interface: Interface in namespace. :param ip_addr: IP to be queried on interface. :param prefix_length: IP prefix length. :param namespace: Execute command in namespace. Optional :type node: dict :type interface: str :type ip_addr: str :type prefix_length: int :type namespace: str :rtype boolean :raises RuntimeError: Request fails. """ ip_addr_with_prefix = f"{ip_addr}/{prefix_length}" if namespace is not None: cmd = f"ip netns exec {namespace} ip addr show dev {interface}" else: cmd = f"ip addr show dev {interface}" cmd += u" | grep 'inet ' | awk -e '{print $2}'" cmd += f" | grep '{ip_addr_with_prefix}'" _, stdout, _ = exec_cmd(node, cmd, timeout=5, sudo=True) has_ip = stdout.rstrip() return bool(has_ip == ip_addr_with_prefix) @staticmethod def add_linux_route(node, ip_addr, prefix, gateway, namespace=None): """Add linux route in namespace. :param node: Node where to execute command. :param ip_addr: Route destination IP address. :param prefix: IP prefix. :param namespace: Execute command in namespace. Optional. :param gateway: Gateway address. :type node: dict :type ip_addr: str :type prefix: int :type gateway: str :type namespace: str """ if namespace is not None: cmd = f"ip netns exec {namespace} ip route add {ip_addr}/{prefix}" \ f" via {gateway}" else: cmd = f"ip route add {ip_addr}/{prefix} via {gateway}" exec_cmd_no_error(node, cmd, sudo=True) @staticmethod def vpp_interface_set_ip_address( node, interface, address, prefix_length=None): """Set IP address to VPP interface. :param node: VPP node. :param interface: Interface name. :param address: IP address. :param prefix_length: Prefix length. :type node: dict :type interface: str :type address: str :type prefix_length: int """ ip_addr = ip_address(address) cmd = u"sw_interface_add_del_address" args = dict( sw_if_index=InterfaceUtil.get_interface_index(node, interface), is_add=True, del_all=False, prefix=IPUtil.create_prefix_object( ip_addr, prefix_length if prefix_length else 128 if ip_addr.version == 6 else 32 ) ) err_msg = f"Failed to add IP address on interface {interface}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg) @staticmethod def vpp_interface_set_ip_addresses(node, interface, ip_addr_list, prefix_length=None): """Set IP addresses to VPP interface. :param node: VPP node. :param interface: Interface name. :param ip_addr_list: IP addresses. :param prefix_length: Prefix length. :type node: dict :type interface: str :type ip_addr_list: list :type prefix_length: int """ for ip_addr in ip_addr_list: IPUtil.vpp_interface_set_ip_address(node, interface, ip_addr, prefix_length) @staticmethod def vpp_add_ip_neighbor(node, iface_key, ip_addr, mac_address): """Add IP neighbor on DUT node. :param node: VPP node. :param iface_key: Interface key. :param ip_addr: IP address of the interface. :param mac_address: MAC address of the interface. :type node: dict :type iface_key: str :type ip_addr: str :type mac_address: str """ dst_ip = ip_address(ip_addr) neighbor = dict( sw_if_index=Topology.get_interface_sw_index(node, iface_key), flags=0, mac_address=str(mac_address), ip_address=str(dst_ip) ) cmd = u"ip_neighbor_add_del" args = dict( is_add=True, neighbor=neighbor ) err_msg = f"Failed to add IP neighbor on interface {iface_key}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg) @staticmethod def create_prefix_object(ip_addr, addr_len): """Create prefix object. :param ip_addr: IPv4 or IPv6 address. :para, addr_len: Length of IP address. :type ip_addr: IPv4Address or IPv6Address :type addr_len: int :returns: Prefix object. :rtype: dict """ addr = IPAddress.create_ip_address_object(ip_addr) return dict( len=int(addr_len), address=addr ) @staticmethod def compose_vpp_route_structure(node, network, prefix_len, **kwargs): """Create route object for ip_route_add_del api call. :param node: VPP node. :param network: Route destination network address. :param prefix_len: Route destination network prefix length. :param kwargs: Optional key-value arguments: gateway: Route gateway address. (str) interface: Route interface. (str) vrf: VRF table ID. (int) count: number of IP addresses to add starting from network IP (int) local: The route is local with same prefix (increment is 1). If None, then is not used. (bool) lookup_vrf: VRF table ID for lookup. (int) multipath: Enable multipath routing. (bool) weight: Weight value for unequal cost multipath routing. (int) :type node: dict :type network: str :type prefix_len: int :type kwargs: dict :returns: route parameter basic structure :rtype: dict """ interface = kwargs.get(u"interface", u"") gateway = kwargs.get(u"gateway", u"") net_addr = ip_address(network) prefix = IPUtil.create_prefix_object(net_addr, prefix_len) paths = list() n_hop = dict( address=IPAddress.union_addr(ip_address(gateway)) if gateway else 0, via_label=MPLS_LABEL_INVALID, obj_id=Constants.BITWISE_NON_ZERO ) path = dict( sw_if_index=InterfaceUtil.get_interface_index(node, interface) if interface else Constants.BITWISE_NON_ZERO, table_id=int(kwargs.get(u"lookup_vrf", 0)), rpf_id=Constants.BITWISE_NON_ZERO, weight=int(kwargs.get(u"weight", 1)), preference=1, type=getattr( FibPathType, u"FIB_PATH_TYPE_LOCAL" if kwargs.get(u"local", False) else u"FIB_PATH_TYPE_NORMAL" ).value, flags=getattr(FibPathFlags, u"FIB_PATH_FLAG_NONE").value, proto=getattr( FibPathNhProto, u"FIB_PATH_NH_PROTO_IP6" if net_addr.version == 6 else u"FIB_PATH_NH_PROTO_IP4" ).value, nh=n_hop, n_labels=0, label_stack=list(0 for _ in range(16)) ) paths.append(path) route = dict( table_id=int(kwargs.get(u"vrf", 0)), prefix=prefix, n_paths=len(paths), paths=paths ) return route @staticmethod def vpp_route_add(node, network, prefix_len, **kwargs): """Add route to the VPP node. :param node: VPP node. :param network: Route destination network address. :param prefix_len: Route destination network prefix length. :param kwargs: Optional key-value arguments: gateway: Route gateway address. (str) interface: Route interface. (str) vrf: VRF table ID. (int) count: number of IP addresses to add starting from network IP (int) local: The route is local with same prefix (increment is 1). If None, then is not used. (bool) lookup_vrf: VRF table ID for lookup. (int) multipath: Enable multipath routing. (bool) weight: Weight value for unequal cost multipath routing. (int) :type node: dict :type network: str :type prefix_len: int :type kwargs: dict """ count = kwargs.get(u"count", 1) if count > 100: gateway = kwargs.get(u"gateway", '') interface = kwargs.get(u"interface", '') vrf = kwargs.get(u"vrf", None) multipath = kwargs.get(u"multipath", False) with VatTerminal(node, json_param=False) as vat: vat.vat_terminal_exec_cmd_from_template( u"vpp_route_add.vat", network=network, prefix_length=prefix_len, via=f"via {gateway}" if gateway else u"", sw_if_index=f"sw_if_index " f"{InterfaceUtil.get_interface_index(node, interface)}" if interface else u"", vrf=f"vrf {vrf}" if vrf else u"", count=f"count {count}" if count else u"", multipath=u"multipath" if multipath else u"" ) return net_addr = ip_address(network) cmd = u"ip_route_add_del" args = dict( is_add=True, is_multipath=kwargs.get(u"multipath", False), route=None ) err_msg = f"Failed to add route(s) on host {node[u'host']}" with PapiSocketExecutor(node) as papi_exec: for i in range(kwargs.get(u"count", 1)): args[u"route"] = IPUtil.compose_vpp_route_structure( node, net_addr + i, prefix_len, **kwargs ) history = bool(not 1 < i < kwargs.get(u"count", 1)) papi_exec.add(cmd, history=history, **args) papi_exec.get_replies(err_msg) @staticmethod def flush_ip_addresses(node, interface): """Flush all IP addresses from specified interface. :param node: VPP node. :param interface: Interface name. :type node: dict :type interface: str """ cmd = u"sw_interface_add_del_address" args = dict( sw_if_index=InterfaceUtil.get_interface_index(node, interface), is_add=False, del_all=True ) err_msg = f"Failed to flush IP address on interface {interface}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg) @staticmethod def add_fib_table(node, table_id, ipv6=False): """Create new FIB table according to ID. :param node: Node to add FIB on. :param table_id: FIB table ID. :param ipv6: Is this an IPv6 table :type node: dict :type table_id: int :type ipv6: bool """ cmd = u"ip_table_add_del" table = dict( table_id=int(table_id), is_ip6=ipv6 ) args = dict( table=table, is_add=True ) err_msg = f"Failed to add FIB table on host {node[u'host']}" with PapiSocketExecutor(node) as papi_exec: papi_exec.add(cmd, **args).get_reply(err_msg)