# Copyright (c) 2021 Cisco and/or its affiliates.
+# Copyright (c) 2021 PANTHEON.tech s.r.o.
# 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:
# limitations under the License.
"""Common IP utilities library."""
+
import re
+import os
from enum import IntEnum
-from ipaddress import ip_address
+from ipaddress import ip_address, ip_network
from resources.libraries.python.Constants import Constants
+from resources.libraries.python.IncrementUtil import ObjIncrement
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.VatExecutor import VatExecutor
from resources.libraries.python.Namespaces import Namespaces
IP_API_DSCP_CS7 = 50
+class NetworkIncrement(ObjIncrement):
+ """
+ An iterator object which accepts an IPv4Network or IPv6Network and
+ returns a new network, its address part incremented by the increment
+ number of network sizes, each time it is iterated or when inc_fmt is called.
+ The increment may be positive, negative or 0
+ (in which case the network is always the same).
+
+ Both initial and subsequent IP address can have host bits set,
+ check the initial value before creating instance if needed.
+ String formatting is configurable via constructor argument.
+ """
+ def __init__(self, initial_value, increment=1, format=u"dash"):
+ """
+ :param initial_value: The initial network. Can have host bits set.
+ :param increment: The current network will be incremented by this
+ amount of network sizes in each iteration/var_str call.
+ :param format: Type of formatting to use, "dash" or "slash" or "addr".
+ :type initial_value: Union[ipaddress.IPv4Network, ipaddress.IPv6Network]
+ :type increment: int
+ :type format: str
+ """
+ super().__init__(initial_value, increment)
+ self._prefix_len = self._value.prefixlen
+ host_len = self._value.max_prefixlen - self._prefix_len
+ self._net_increment = self._increment * (1 << host_len)
+ self._format = str(format).lower()
+
+ def _incr(self):
+ """
+ Increment the network, e.g.:
+ '30.0.0.0/24' incremented by 1 (the next network) is '30.0.1.0/24'.
+ '30.0.0.0/24' incremented by 2 is '30.0.2.0/24'.
+ """
+ self._value = ip_network(
+ f"{self._value.network_address + self._net_increment}"
+ f"/{self._prefix_len}", strict=False
+ )
+
+ def _str_fmt(self):
+ """
+ The string representation of the network depends on format.
+
+ Dash format is '<ip_address_start> - <ip_address_stop>',
+ useful for 'ipsec policy add spd' CLI.
+
+ Slash format is '<ip_address_start>/<prefix_length>',
+ useful for other CLI.
+
+ Addr format is '<ip_address_start>', useful for PAPI.
+
+ :returns: Current value converted to string according to format.
+ :rtype: str
+ :raises RuntimeError: If the format is not supported.
+ """
+ if self._format == u"dash":
+ return f"{self._value.network_address} - " \
+ f"{self._value.broadcast_address}"
+ elif self._format == u"slash":
+ return f"{self._value.network_address}/{self._prefix_len}"
+ elif self._format == u"addr":
+ return f"{self._value.network_address}"
+ else:
+ raise RuntimeError(f"Unsupported format {self._format}")
+
+
class IPUtil:
"""Common IP utilities"""
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)
+ (Multipath value enters at higher level.)
:type node: dict
:type network: str
return route
@staticmethod
- def vpp_route_add(node, network, prefix_len, **kwargs):
- """Add route to the VPP node.
+ def vpp_route_add(node, network, prefix_len, strict=True, **kwargs):
+ """Add route to the VPP node. Prefer multipath behavior.
:param node: VPP node.
:param network: Route destination network address.
:param prefix_len: Route destination network prefix length.
+ :param strict: If true, fail if address has host bits set.
: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).
+ local: The route is local with same prefix (increment is 1 network)
If None, then is not used. (bool)
lookup_vrf: VRF table ID for lookup. (int)
- multipath: Enable multipath routing. (bool)
+ multipath: Enable multipath routing. (bool) Default: True.
weight: Weight value for unequal cost multipath routing. (int)
:type node: dict
:type network: str
:type prefix_len: int
+ :type strict: bool
:type kwargs: dict
+ :raises RuntimeError: If the argument combination is not supported.
"""
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""
+ if not kwargs.get(u"multipath", True):
+ raise RuntimeError(u"VAT exec supports only multipath behavior")
+ gateway = kwargs.get(u"gateway", u"")
+ interface = kwargs.get(u"interface", u"")
+ local = kwargs.get(u"local", u"")
+ if interface:
+ interface = InterfaceUtil.vpp_get_interface_name(
+ node, InterfaceUtil.get_interface_index(
+ node, interface
+ )
)
+ vrf = kwargs.get(u"vrf", None)
+ trailers = list()
+ if vrf:
+ trailers.append(f"table {vrf}")
+ if gateway:
+ trailers.append(f"via {gateway}")
+ if interface:
+ trailers.append(interface)
+ elif interface:
+ trailers.append(f"via {interface}")
+ if local:
+ if gateway or interface:
+ raise RuntimeError(u"Unsupported combination with local.")
+ trailers.append(u"local")
+ trailer = u" ".join(trailers)
+ command_parts = [u"exec ip route add", u"network goes here"]
+ if trailer:
+ command_parts.append(trailer)
+ netiter = NetworkIncrement(
+ ip_network(f"{network}/{prefix_len}", strict=strict),
+ format=u"slash"
+ )
+ tmp_filename = u"/tmp/routes.config"
+ with open(tmp_filename, u"w") as tmp_file:
+ for _ in range(count):
+ command_parts[1] = netiter.inc_fmt()
+ print(u" ".join(command_parts), file=tmp_file)
+ VatExecutor().execute_script(
+ tmp_filename, node, timeout=1800, json_out=False,
+ copy_on_execute=True, history=False
+ )
+ os.remove(tmp_filename)
return
- net_addr = ip_address(network)
cmd = u"ip_route_add_del"
args = dict(
is_add=True,
- is_multipath=kwargs.get(u"multipath", False),
+ is_multipath=kwargs.get(u"multipath", True),
route=None
)
err_msg = f"Failed to add route(s) on host {node[u'host']}"
+ netiter = NetworkIncrement(
+ ip_network(f"{network}/{prefix_len}", strict=strict),
+ format=u"addr"
+ )
with PapiSocketExecutor(node) as papi_exec:
- for i in range(kwargs.get(u"count", 1)):
+ for i in range(count):
args[u"route"] = IPUtil.compose_vpp_route_structure(
- node, net_addr + i, prefix_len, **kwargs
+ node, netiter.inc_fmt(), prefix_len, **kwargs
)
- history = bool(not 1 < i < kwargs.get(u"count", 1))
+ history = bool(not 0 < i < count - 1)
papi_exec.add(cmd, history=history, **args)
papi_exec.get_replies(err_msg)
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