-# Copyright (c) 2020 Cisco and/or its affiliates.
+# Copyright (c) 2023 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:
class NatConfigFlags(IntEnum):
- """Common NAT plugin APIs"""
+ """NAT plugin configuration flags"""
NAT_IS_NONE = 0x00
NAT_IS_TWICE_NAT = 0x01
NAT_IS_SELF_TWICE_NAT = 0x02
NAT_IS_EXT_HOST_VALID = 0x80
+class Nat44ConfigFlags(IntEnum):
+ """NAT44 configuration flags"""
+ NAT44_IS_ENDPOINT_INDEPENDENT = 0x00
+ NAT44_IS_ENDPOINT_DEPENDENT = 0x01
+ NAT44_IS_STATIC_MAPPING_ONLY = 0x02
+ NAT44_IS_CONNECTION_TRACKING = 0x04
+ NAT44_IS_OUT2IN_DPO = 0x08
+
+
class NatAddrPortAllocAlg(IntEnum):
"""NAT Address and port assignment algorithms."""
NAT_ALLOC_ALG_DEFAULT = 0
def __init__(self):
pass
+ @staticmethod
+ def enable_nat44_ed_plugin(
+ node, inside_vrf=0, outside_vrf=0, sessions=0, session_memory=0,
+ mode=u""):
+ """Enable NAT44 plugin.
+
+ :param node: DUT node.
+ :param inside_vrf: Inside VRF ID.
+ :param outside_vrf: Outside VRF ID.
+ :param sessions: Maximum number of sessions.
+ :param session_memory: Session memory size - overwrite auto calculated
+ hash allocation parameter if non-zero.
+ :param mode: NAT44 mode. Valid values:
+ - endpoint-independent
+ - endpoint-dependent
+ - static-mapping-only
+ - connection-tracking
+ - out2in-dpo
+ :type node: dict
+ :type inside_vrf: str or int
+ :type outside_vrf: str or int
+ :type sessions: str or int
+ :type session_memory: str or int
+ :type mode: str
+ """
+ cmd = u"nat44_ed_plugin_enable_disable"
+ err_msg = f"Failed to enable NAT44 plugin on the host {node[u'host']}!"
+ args_in = dict(
+ enable=True,
+ inside_vrf=int(inside_vrf),
+ outside_vrf=int(outside_vrf),
+ sessions=int(sessions),
+ session_memory=int(session_memory),
+ flags=getattr(
+ Nat44ConfigFlags,
+ f"NAT44_IS_{mode.replace(u'-', u'_').upper()}"
+ ).value
+ )
+
+ with PapiSocketExecutor(node) as papi_exec:
+ papi_exec.add(cmd, **args_in).get_reply(err_msg)
+
@staticmethod
def set_nat44_interface(node, interface, flag):
"""Set inside and outside interfaces for NAT44.
flag=u"NAT_IS_NONE"):
"""Set NAT44 address range.
+ The return value is a callable (zero argument Python function)
+ which can be used to reset NAT state, so repeated trial measurements
+ hit the same slow path.
+
:param node: DUT node.
:param start_ip: IP range start.
:param end_ip: IP range end.
:type end_ip: str
:type vrf_id: int
:type flag: str
+ :returns: Resetter of the NAT state.
+ :rtype: Callable[[], None]
"""
cmd = u"nat44_add_del_address_range"
err_msg = f"Failed to set NAT44 address range on host {node[u'host']}"
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args_in).get_reply(err_msg)
+ # A closure, accessing the variables above.
+ def resetter():
+ """Delete and re-add the NAT range setting."""
+ with PapiSocketExecutor(node) as papi_exec:
+ args_in[u"is_add"] = False
+ papi_exec.add(cmd, **args_in).get_reply(err_msg)
+ args_in[u"is_add"] = True
+ papi_exec.add(cmd, **args_in).get_reply(err_msg)
+
+ return resetter
+
@staticmethod
- def show_nat_config(node):
- """Show the NAT configuration.
+ def show_nat44_config(node):
+ """Show the NAT44 plugin running configuration.
:param node: DUT node.
:type node: dict
"""
- cmd = u"nat_show_config"
- err_msg = f"Failed to get NAT configuration on host {node[u'host']}"
+ cmd = u"nat44_show_running_config"
+ err_msg = f"Failed to get NAT44 configuration on host {node[u'host']}"
with PapiSocketExecutor(node) as papi_exec:
reply = papi_exec.add(cmd).get_reply(err_msg)
- logger.debug(f"NAT Configuration:\n{pformat(reply)}")
+ logger.debug(f"NAT44 Configuration:\n{pformat(reply)}")
@staticmethod
def show_nat44_summary(node):
:returns: Value of max_translations_per_thread NAT44 parameter.
:rtype: int
"""
+ # vpp-device tests have not dedicated physical core so
+ # ${dp_count_int} == 0 but we need to use one thread
+ threads = 1 if not int(threads) else int(threads)
rest, mult = modf(log2(sessions/(10*threads)))
return 2 ** (int(mult) + (1 if rest else 0)) * 10
@staticmethod
def get_nat44_sessions_number(node, proto):
- """Get number of established NAT44 sessions from actual NAT44 mapping
- data.
+ """Get number of expected NAT44 sessions from NAT44 mapping data.
+
+ This keyword uses output from a CLI command,
+ so it can start failing when VPP changes the output format.
+ TODO: Switch to API (or stat segment) when available.
+
+ The current implementation supports both 2202 and post-2202 format.
+ (The Gerrit number changing the output format is 34877.)
+
+ For TCP proto, the expected state after rampup is
+ some number of sessions in transitory state (VPP has seen the FINs),
+ and some number of sessions in established state (meaning
+ some FINs were lost in the last trial).
+ While the two states may need slightly different number of cycles
+ to process next packet, the current implementation considers
+ both of them the "fast path", so they are both counted as expected.
+
+ As the tests should fail if a session is timed-out,
+ the logic substracts timed out sessions for the returned value
+ (only available for post-2202 format).
+
+ TODO: Investigate if it is worth to insert additional rampup trials
+ in TPUT tests to ensure all sessions are transitory before next
+ measurement.
:param node: DUT node.
:param proto: Required protocol - TCP/UDP/ICMP.
:type node: dict
:type proto: str
- :returns: Number of established NAT44 sessions.
+ :returns: Number of active established NAT44 sessions.
:rtype: int
:raises ValueError: If not supported protocol.
+ :raises RuntimeError: If output is not formatted as expected.
"""
- nat44_data = dict()
- if proto in [u"UDP", u"TCP", u"ICMP"]:
- for line in NATUtil.show_nat44_summary(node).splitlines():
- sum_k, sum_v = line.split(u":") if u":" in line \
- else (line, None)
- nat44_data[sum_k] = sum_v.strip() if isinstance(sum_v, str) \
- else sum_v
- else:
+ proto_l = proto.strip().lower()
+ if proto_l not in [u"udp", u"tcp", u"icmp"]:
raise ValueError(f"Unsupported protocol: {proto}!")
- return nat44_data.get(f"total {proto.lower()} sessions", 0)
+ summary_text = NATUtil.show_nat44_summary(node)
+ summary_lines = summary_text.splitlines()
+ # Output from VPP v22.02 and before, delete when no longer needed.
+ pattern_2202 = f"total {proto_l} sessions:"
+ if pattern_2202 in summary_text:
+ for line in summary_lines:
+ if pattern_2202 not in line:
+ continue
+ return int(line.split(u":", 1)[1].strip())
+ # Post-2202, the proto info and session info are not on the same line.
+ found = False
+ for line in summary_lines:
+ if not found:
+ if f"{proto_l} sessions:" in line:
+ found = True
+ continue
+ # Proto is found, find the line we are interested in.
+ if u"total" not in line:
+ raise RuntimeError(f"show nat summary: no {proto} total.")
+ # We have the line with relevant numbers.
+ total_part, timed_out_part = line.split(u"(", 1)
+ timed_out_part = timed_out_part.split(u")", 1)[0]
+ total_count = int(total_part.split(u":", 1)[1].strip())
+ timed_out_count = int(timed_out_part.split(u":", 1)[1].strip())
+ active_count = total_count - timed_out_count
+ return active_count
+ raise RuntimeError(u"Unknown format of show nat44 summary")
# DET44 PAPI calls
# DET44 means deterministic mode of NAT44
def set_det44_mapping(node, ip_in, subnet_in, ip_out, subnet_out):
"""Set DET44 mapping.
+ The return value is a callable (zero argument Python function)
+ which can be used to reset NAT state, so repeated trial measurements
+ hit the same slow path.
+
:param node: DUT node.
:param ip_in: Inside IP.
:param subnet_in: Inside IP subnet.
with PapiSocketExecutor(node) as papi_exec:
papi_exec.add(cmd, **args_in).get_reply(err_msg)
+ # A closure, accessing the variables above.
+ def resetter():
+ """Delete and re-add the deterministic NAT mapping."""
+ with PapiSocketExecutor(node) as papi_exec:
+ args_in[u"is_add"] = False
+ papi_exec.add(cmd, **args_in).get_reply(err_msg)
+ args_in[u"is_add"] = True
+ papi_exec.add(cmd, **args_in).get_reply(err_msg)
+
+ return resetter
+
@staticmethod
def get_det44_mapping(node):
"""Get DET44 mapping data.
def get_det44_sessions_number(node):
"""Get number of established DET44 sessions from actual DET44 mapping
data.
-
:param node: DUT node.
:type node: dict
:returns: Number of established DET44 sessions.
:rtype: int
"""
det44_data = NATUtil.get_det44_mapping(node)
-
return det44_data.get(u"ses_num", 0)
@staticmethod
Code Review / csit.git / blobdiff