| #!/usr/bin/env python3 |
| |
| from __future__ import print_function |
| import logging |
| import sys |
| import os |
| import select |
| import signal |
| import subprocess |
| import unittest |
| import re |
| import time |
| import faulthandler |
| import random |
| import copy |
| import platform |
| import shutil |
| from collections import deque |
| from threading import Thread, Event |
| from inspect import getdoc, isclass |
| from traceback import format_exception |
| from logging import FileHandler, DEBUG, Formatter |
| from enum import Enum |
| from abc import ABC, abstractmethod |
| from struct import pack, unpack |
| |
| import scapy.compat |
| from scapy.packet import Raw, Packet |
| from vpp_pg_interface import VppPGInterface |
| from vpp_sub_interface import VppSubInterface |
| from vpp_lo_interface import VppLoInterface |
| from vpp_bvi_interface import VppBviInterface |
| from vpp_papi_provider import VppPapiProvider |
| from vpp_papi import VppEnum |
| import vpp_papi |
| from vpp_object import VppObjectRegistry |
| from util import ppp, is_core_present |
| from scapy.layers.inet import IPerror, TCPerror, UDPerror, ICMPerror |
| from scapy.layers.inet6 import ICMPv6DestUnreach, ICMPv6EchoRequest |
| from scapy.layers.inet6 import ICMPv6EchoReply |
| from vpp_running import use_running |
| from asfframework import VppAsfTestCase |
| |
| |
| """ |
| Packet Generator / Scapy Test framework module. |
| |
| The module provides a set of tools for constructing and running tests and |
| representing the results. |
| """ |
| |
| |
| class _PacketInfo(object): |
| """Private class to create packet info object. |
| |
| Help process information about the next packet. |
| Set variables to default values. |
| """ |
| |
| #: Store the index of the packet. |
| index = -1 |
| #: Store the index of the source packet generator interface of the packet. |
| src = -1 |
| #: Store the index of the destination packet generator interface |
| #: of the packet. |
| dst = -1 |
| #: Store expected ip version |
| ip = -1 |
| #: Store expected upper protocol |
| proto = -1 |
| #: Store the copy of the former packet. |
| data = None |
| |
| def __eq__(self, other): |
| index = self.index == other.index |
| src = self.src == other.src |
| dst = self.dst == other.dst |
| data = self.data == other.data |
| return index and src and dst and data |
| |
| |
| @use_running |
| class VppTestCase(VppAsfTestCase): |
| """This subclass is a base class for VPP test cases that are implemented as |
| classes. It provides methods to create and run test case. |
| """ |
| |
| @property |
| def packet_infos(self): |
| """List of packet infos""" |
| return self._packet_infos |
| |
| @classmethod |
| def get_packet_count_for_if_idx(cls, dst_if_index): |
| """Get the number of packet info for specified destination if index""" |
| if dst_if_index in cls._packet_count_for_dst_if_idx: |
| return cls._packet_count_for_dst_if_idx[dst_if_index] |
| else: |
| return 0 |
| |
| @classmethod |
| def setUpClass(cls): |
| super(VppTestCase, cls).setUpClass() |
| cls.reset_packet_infos() |
| cls._pcaps = [] |
| cls._old_pcaps = [] |
| |
| @classmethod |
| def tearDownClass(cls): |
| cls.logger.debug("--- tearDownClass() for %s called ---" % cls.__name__) |
| cls.reset_packet_infos() |
| super(VppTestCase, cls).tearDownClass() |
| |
| @classmethod |
| def pg_enable_capture(cls, interfaces=None): |
| """ |
| Enable capture on packet-generator interfaces |
| |
| :param interfaces: iterable interface indexes (if None, |
| use self.pg_interfaces) |
| |
| """ |
| if interfaces is None: |
| interfaces = cls.pg_interfaces |
| for i in interfaces: |
| i.enable_capture() |
| |
| @classmethod |
| def register_pcap(cls, intf, worker): |
| """Register a pcap in the testclass""" |
| # add to the list of captures with current timestamp |
| cls._pcaps.append((intf, worker)) |
| |
| @classmethod |
| def pg_start(cls, trace=True, traceFilter=False): |
| """Enable the PG, wait till it is done, then clean up""" |
| for intf, worker in cls._old_pcaps: |
| intf.remove_old_pcap_file(intf.get_in_path(worker)) |
| cls._old_pcaps = [] |
| if trace: |
| cls.vapi.cli("clear trace") |
| cls.vapi.cli("trace add pg-input 1000" + (" filter" if traceFilter else "")) |
| cls.vapi.cli("packet-generator enable") |
| # PG, when starts, runs to completion - |
| # so let's avoid a race condition, |
| # and wait a little till it's done. |
| # Then clean it up - and then be gone. |
| deadline = time.time() + 300 |
| while cls.vapi.cli("show packet-generator").find("Yes") != -1: |
| cls.sleep(0.01) # yield |
| if time.time() > deadline: |
| cls.logger.error("Timeout waiting for pg to stop") |
| break |
| for intf, worker in cls._pcaps: |
| cls.vapi.cli("packet-generator delete %s" % intf.get_cap_name(worker)) |
| cls._old_pcaps = cls._pcaps |
| cls._pcaps = [] |
| |
| @classmethod |
| def create_pg_interfaces_internal(cls, interfaces, gso=0, gso_size=0, mode=None): |
| """ |
| Create packet-generator interfaces. |
| |
| :param interfaces: iterable indexes of the interfaces. |
| :returns: List of created interfaces. |
| |
| """ |
| result = [] |
| for i in interfaces: |
| intf = VppPGInterface(cls, i, gso, gso_size, mode) |
| setattr(cls, intf.name, intf) |
| result.append(intf) |
| cls.pg_interfaces = result |
| return result |
| |
| @classmethod |
| def create_pg_ip4_interfaces(cls, interfaces, gso=0, gso_size=0): |
| if not hasattr(cls, "vpp"): |
| cls.pg_interfaces = [] |
| return cls.pg_interfaces |
| pgmode = VppEnum.vl_api_pg_interface_mode_t |
| return cls.create_pg_interfaces_internal( |
| interfaces, gso, gso_size, pgmode.PG_API_MODE_IP4 |
| ) |
| |
| @classmethod |
| def create_pg_ip6_interfaces(cls, interfaces, gso=0, gso_size=0): |
| if not hasattr(cls, "vpp"): |
| cls.pg_interfaces = [] |
| return cls.pg_interfaces |
| pgmode = VppEnum.vl_api_pg_interface_mode_t |
| return cls.create_pg_interfaces_internal( |
| interfaces, gso, gso_size, pgmode.PG_API_MODE_IP6 |
| ) |
| |
| @classmethod |
| def create_pg_interfaces(cls, interfaces, gso=0, gso_size=0): |
| if not hasattr(cls, "vpp"): |
| cls.pg_interfaces = [] |
| return cls.pg_interfaces |
| pgmode = VppEnum.vl_api_pg_interface_mode_t |
| return cls.create_pg_interfaces_internal( |
| interfaces, gso, gso_size, pgmode.PG_API_MODE_ETHERNET |
| ) |
| |
| @classmethod |
| def create_pg_ethernet_interfaces(cls, interfaces, gso=0, gso_size=0): |
| if not hasattr(cls, "vpp"): |
| cls.pg_interfaces = [] |
| return cls.pg_interfaces |
| pgmode = VppEnum.vl_api_pg_interface_mode_t |
| return cls.create_pg_interfaces_internal( |
| interfaces, gso, gso_size, pgmode.PG_API_MODE_ETHERNET |
| ) |
| |
| @classmethod |
| def create_loopback_interfaces(cls, count): |
| """ |
| Create loopback interfaces. |
| |
| :param count: number of interfaces created. |
| :returns: List of created interfaces. |
| """ |
| if not hasattr(cls, "vpp"): |
| cls.lo_interfaces = [] |
| return cls.lo_interfaces |
| result = [VppLoInterface(cls) for i in range(count)] |
| for intf in result: |
| setattr(cls, intf.name, intf) |
| cls.lo_interfaces = result |
| return result |
| |
| @classmethod |
| def create_bvi_interfaces(cls, count): |
| """ |
| Create BVI interfaces. |
| |
| :param count: number of interfaces created. |
| :returns: List of created interfaces. |
| """ |
| if not hasattr(cls, "vpp"): |
| cls.bvi_interfaces = [] |
| return cls.bvi_interfaces |
| result = [VppBviInterface(cls) for i in range(count)] |
| for intf in result: |
| setattr(cls, intf.name, intf) |
| cls.bvi_interfaces = result |
| return result |
| |
| @staticmethod |
| def extend_packet(packet, size, padding=" "): |
| """ |
| Extend packet to given size by padding with spaces or custom padding |
| NOTE: Currently works only when Raw layer is present. |
| |
| :param packet: packet |
| :param size: target size |
| :param padding: padding used to extend the payload |
| |
| """ |
| packet_len = len(packet) + 4 |
| extend = size - packet_len |
| if extend > 0: |
| num = (extend // len(padding)) + 1 |
| packet[Raw].load += (padding * num)[:extend].encode("ascii") |
| |
| @classmethod |
| def reset_packet_infos(cls): |
| """Reset the list of packet info objects and packet counts to zero""" |
| cls._packet_infos = {} |
| cls._packet_count_for_dst_if_idx = {} |
| |
| @classmethod |
| def create_packet_info(cls, src_if, dst_if): |
| """ |
| Create packet info object containing the source and destination indexes |
| and add it to the testcase's packet info list |
| |
| :param VppInterface src_if: source interface |
| :param VppInterface dst_if: destination interface |
| |
| :returns: _PacketInfo object |
| |
| """ |
| info = _PacketInfo() |
| info.index = len(cls._packet_infos) |
| info.src = src_if.sw_if_index |
| info.dst = dst_if.sw_if_index |
| if isinstance(dst_if, VppSubInterface): |
| dst_idx = dst_if.parent.sw_if_index |
| else: |
| dst_idx = dst_if.sw_if_index |
| if dst_idx in cls._packet_count_for_dst_if_idx: |
| cls._packet_count_for_dst_if_idx[dst_idx] += 1 |
| else: |
| cls._packet_count_for_dst_if_idx[dst_idx] = 1 |
| cls._packet_infos[info.index] = info |
| return info |
| |
| @staticmethod |
| def info_to_payload(info): |
| """ |
| Convert _PacketInfo object to packet payload |
| |
| :param info: _PacketInfo object |
| |
| :returns: string containing serialized data from packet info |
| """ |
| |
| # retrieve payload, currently 18 bytes (4 x ints + 1 short) |
| return pack("iiiih", info.index, info.src, info.dst, info.ip, info.proto) |
| |
| @staticmethod |
| def payload_to_info(payload, payload_field="load"): |
| """ |
| Convert packet payload to _PacketInfo object |
| |
| :param payload: packet payload |
| :type payload: <class 'scapy.packet.Raw'> |
| :param payload_field: packet fieldname of payload "load" for |
| <class 'scapy.packet.Raw'> |
| :type payload_field: str |
| :returns: _PacketInfo object containing de-serialized data from payload |
| |
| """ |
| |
| # retrieve payload, currently 18 bytes (4 x ints + 1 short) |
| payload_b = getattr(payload, payload_field)[:18] |
| |
| info = _PacketInfo() |
| info.index, info.src, info.dst, info.ip, info.proto = unpack("iiiih", payload_b) |
| |
| # some SRv6 TCs depend on get an exception if bad values are detected |
| if info.index > 0x4000: |
| raise ValueError("Index value is invalid") |
| |
| return info |
| |
| def get_next_packet_info(self, info): |
| """ |
| Iterate over the packet info list stored in the testcase |
| Start iteration with first element if info is None |
| Continue based on index in info if info is specified |
| |
| :param info: info or None |
| :returns: next info in list or None if no more infos |
| """ |
| if info is None: |
| next_index = 0 |
| else: |
| next_index = info.index + 1 |
| if next_index == len(self._packet_infos): |
| return None |
| else: |
| return self._packet_infos[next_index] |
| |
| def get_next_packet_info_for_interface(self, src_index, info): |
| """ |
| Search the packet info list for the next packet info with same source |
| interface index |
| |
| :param src_index: source interface index to search for |
| :param info: packet info - where to start the search |
| :returns: packet info or None |
| |
| """ |
| while True: |
| info = self.get_next_packet_info(info) |
| if info is None: |
| return None |
| if info.src == src_index: |
| return info |
| |
| def get_next_packet_info_for_interface2(self, src_index, dst_index, info): |
| """ |
| Search the packet info list for the next packet info with same source |
| and destination interface indexes |
| |
| :param src_index: source interface index to search for |
| :param dst_index: destination interface index to search for |
| :param info: packet info - where to start the search |
| :returns: packet info or None |
| |
| """ |
| while True: |
| info = self.get_next_packet_info_for_interface(src_index, info) |
| if info is None: |
| return None |
| if info.dst == dst_index: |
| return info |
| |
| def assert_packet_checksums_valid(self, packet, ignore_zero_udp_checksums=True): |
| received = packet.__class__(scapy.compat.raw(packet)) |
| udp_layers = ["UDP", "UDPerror"] |
| checksum_fields = ["cksum", "chksum"] |
| checksums = [] |
| counter = 0 |
| temp = received.__class__(scapy.compat.raw(received)) |
| while True: |
| layer = temp.getlayer(counter) |
| if layer: |
| layer = layer.copy() |
| layer.remove_payload() |
| for cf in checksum_fields: |
| if hasattr(layer, cf): |
| if ( |
| ignore_zero_udp_checksums |
| and 0 == getattr(layer, cf) |
| and layer.name in udp_layers |
| ): |
| continue |
| delattr(temp.getlayer(counter), cf) |
| checksums.append((counter, cf)) |
| else: |
| break |
| counter = counter + 1 |
| if 0 == len(checksums): |
| return |
| temp = temp.__class__(scapy.compat.raw(temp)) |
| for layer, cf in reversed(checksums): |
| calc_sum = getattr(temp[layer], cf) |
| self.assert_equal( |
| getattr(received[layer], cf), |
| calc_sum, |
| "packet checksum on layer #%d: %s" % (layer, temp[layer].name), |
| ) |
| self.logger.debug( |
| "Checksum field `%s` on `%s` layer has correct value `%s`" |
| % (cf, temp[layer].name, calc_sum) |
| ) |
| |
| def assert_checksum_valid( |
| self, |
| received_packet, |
| layer, |
| checksum_field_names=["chksum", "cksum"], |
| ignore_zero_checksum=False, |
| ): |
| """Check checksum of received packet on given layer""" |
| layer_copy = received_packet[layer].copy() |
| layer_copy.remove_payload() |
| field_name = None |
| for f in checksum_field_names: |
| if hasattr(layer_copy, f): |
| field_name = f |
| break |
| if field_name is None: |
| raise Exception( |
| f"Layer `{layer}` has none of checksum fields: `{checksum_field_names}`." |
| ) |
| received_packet_checksum = getattr(received_packet[layer], field_name) |
| if ignore_zero_checksum and 0 == received_packet_checksum: |
| return |
| recalculated = received_packet.__class__(scapy.compat.raw(received_packet)) |
| delattr(recalculated[layer], field_name) |
| recalculated = recalculated.__class__(scapy.compat.raw(recalculated)) |
| self.assert_equal( |
| received_packet_checksum, |
| getattr(recalculated[layer], field_name), |
| f"packet checksum (field: {field_name}) on layer: %s" % layer, |
| ) |
| |
| def assert_ip_checksum_valid(self, received_packet, ignore_zero_checksum=False): |
| self.assert_checksum_valid( |
| received_packet, "IP", ignore_zero_checksum=ignore_zero_checksum |
| ) |
| |
| def assert_tcp_checksum_valid(self, received_packet, ignore_zero_checksum=False): |
| self.assert_checksum_valid( |
| received_packet, "TCP", ignore_zero_checksum=ignore_zero_checksum |
| ) |
| |
| def assert_udp_checksum_valid(self, received_packet, ignore_zero_checksum=True): |
| self.assert_checksum_valid( |
| received_packet, "UDP", ignore_zero_checksum=ignore_zero_checksum |
| ) |
| |
| def assert_embedded_icmp_checksum_valid(self, received_packet): |
| if received_packet.haslayer(IPerror): |
| self.assert_checksum_valid(received_packet, "IPerror") |
| if received_packet.haslayer(TCPerror): |
| self.assert_checksum_valid(received_packet, "TCPerror") |
| if received_packet.haslayer(UDPerror): |
| self.assert_checksum_valid( |
| received_packet, "UDPerror", ignore_zero_checksum=True |
| ) |
| if received_packet.haslayer(ICMPerror): |
| self.assert_checksum_valid(received_packet, "ICMPerror") |
| |
| def assert_icmp_checksum_valid(self, received_packet): |
| self.assert_checksum_valid(received_packet, "ICMP") |
| self.assert_embedded_icmp_checksum_valid(received_packet) |
| |
| def assert_icmpv6_checksum_valid(self, pkt): |
| if pkt.haslayer(ICMPv6DestUnreach): |
| self.assert_checksum_valid(pkt, "ICMPv6DestUnreach") |
| self.assert_embedded_icmp_checksum_valid(pkt) |
| if pkt.haslayer(ICMPv6EchoRequest): |
| self.assert_checksum_valid(pkt, "ICMPv6EchoRequest") |
| if pkt.haslayer(ICMPv6EchoReply): |
| self.assert_checksum_valid(pkt, "ICMPv6EchoReply") |
| |
| def assert_packet_counter_equal(self, counter, expected_value): |
| counter_value = self.get_counter(counter) |
| self.assert_equal( |
| counter_value, expected_value, "packet counter `%s'" % counter |
| ) |
| |
| def pg_send(self, intf, pkts, worker=None, trace=True): |
| intf.add_stream(pkts, worker=worker) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start(trace=trace) |
| |
| def send_and_assert_no_replies( |
| self, intf, pkts, remark="", timeout=None, stats_diff=None, trace=True, msg=None |
| ): |
| if stats_diff: |
| stats_snapshot = self.snapshot_stats(stats_diff) |
| |
| self.pg_send(intf, pkts) |
| |
| try: |
| if not timeout: |
| timeout = 1 |
| for i in self.pg_interfaces: |
| i.assert_nothing_captured(timeout=timeout, remark=remark) |
| timeout = 0.1 |
| finally: |
| if trace: |
| if msg: |
| self.logger.debug(f"send_and_assert_no_replies: {msg}") |
| self.logger.debug(self.vapi.cli("show trace")) |
| |
| if stats_diff: |
| self.compare_stats_with_snapshot(stats_diff, stats_snapshot) |
| |
| def send_and_expect( |
| self, |
| intf, |
| pkts, |
| output, |
| n_rx=None, |
| worker=None, |
| trace=True, |
| msg=None, |
| stats_diff=None, |
| ): |
| if stats_diff: |
| stats_snapshot = self.snapshot_stats(stats_diff) |
| |
| if not n_rx: |
| n_rx = 1 if isinstance(pkts, Packet) else len(pkts) |
| self.pg_send(intf, pkts, worker=worker, trace=trace) |
| rx = output.get_capture(n_rx) |
| if trace: |
| if msg: |
| self.logger.debug(f"send_and_expect: {msg}") |
| self.logger.debug(self.vapi.cli("show trace")) |
| |
| if stats_diff: |
| self.compare_stats_with_snapshot(stats_diff, stats_snapshot) |
| |
| return rx |
| |
| def send_and_expect_load_balancing( |
| self, input, pkts, outputs, worker=None, trace=True |
| ): |
| self.pg_send(input, pkts, worker=worker, trace=trace) |
| rxs = [] |
| for oo in outputs: |
| rx = oo._get_capture(1) |
| self.assertNotEqual(0, len(rx), f"0 != len(rx) ({len(rx)})") |
| rxs.append(rx) |
| if trace: |
| self.logger.debug(self.vapi.cli("show trace")) |
| return rxs |
| |
| def send_and_expect_some(self, intf, pkts, output, worker=None, trace=True): |
| self.pg_send(intf, pkts, worker=worker, trace=trace) |
| rx = output._get_capture(1) |
| if trace: |
| self.logger.debug(self.vapi.cli("show trace")) |
| self.assertTrue(len(rx) > 0) |
| self.assertTrue( |
| len(rx) <= len(pkts), f"len(rx) ({len(rx)}) > len(pkts) ({len(pkts)})" |
| ) |
| return rx |
| |
| def send_and_expect_only(self, intf, pkts, output, timeout=None, stats_diff=None): |
| if stats_diff: |
| stats_snapshot = self.snapshot_stats(stats_diff) |
| |
| self.pg_send(intf, pkts) |
| rx = output.get_capture(len(pkts)) |
| outputs = [output] |
| if not timeout: |
| timeout = 1 |
| for i in self.pg_interfaces: |
| if i not in outputs: |
| i.assert_nothing_captured(timeout=timeout) |
| timeout = 0.1 |
| |
| if stats_diff: |
| self.compare_stats_with_snapshot(stats_diff, stats_snapshot) |
| |
| return rx |
| |
| |
| if __name__ == "__main__": |
| pass |