7bb873a4cc
Change-Id: Idb3119792943664748c4abc3829ad723f4156dfe Signed-off-by: Klement Sekera <ksekera@cisco.com>
226 lines
7.9 KiB
Python
226 lines
7.9 KiB
Python
import os
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import time
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from scapy.utils import wrpcap, rdpcap
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from vpp_interface import VppInterface
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from scapy.layers.l2 import Ether, ARP
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from scapy.layers.inet6 import IPv6, ICMPv6ND_NS, ICMPv6ND_NA, \
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ICMPv6NDOptSrcLLAddr, ICMPv6NDOptDstLLAddr
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from util import ppp
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class VppPGInterface(VppInterface):
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"""
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VPP packet-generator interface
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"""
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@property
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def pg_index(self):
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"""packet-generator interface index assigned by VPP"""
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return self._pg_index
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@property
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def out_path(self):
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"""pcap file path - captured packets"""
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return self._out_path
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@property
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def in_path(self):
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""" pcap file path - injected packets"""
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return self._in_path
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@property
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def capture_cli(self):
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"""CLI string to start capture on this interface"""
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return self._capture_cli
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@property
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def cap_name(self):
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"""capture name for this interface"""
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return self._cap_name
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@property
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def input_cli(self):
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"""CLI string to load the injected packets"""
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return self._input_cli
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@property
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def in_history_counter(self):
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"""Self-incrementing counter used when renaming old pcap files"""
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v = self._in_history_counter
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self._in_history_counter += 1
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return v
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@property
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def out_history_counter(self):
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"""Self-incrementing counter used when renaming old pcap files"""
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v = self._out_history_counter
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self._out_history_counter += 1
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return v
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def __init__(self, test, pg_index):
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""" Create VPP packet-generator interface """
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r = test.vapi.pg_create_interface(pg_index)
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self._sw_if_index = r.sw_if_index
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super(VppPGInterface, self).__init__(test)
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self._in_history_counter = 0
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self._out_history_counter = 0
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self._pg_index = pg_index
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self._out_file = "pg%u_out.pcap" % self.pg_index
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self._out_path = self.test.tempdir + "/" + self._out_file
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self._in_file = "pg%u_in.pcap" % self.pg_index
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self._in_path = self.test.tempdir + "/" + self._in_file
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self._capture_cli = "packet-generator capture pg%u pcap %s" % (
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self.pg_index, self.out_path)
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self._cap_name = "pcap%u" % self.sw_if_index
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self._input_cli = "packet-generator new pcap %s source pg%u name %s" % (
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self.in_path, self.pg_index, self.cap_name)
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def enable_capture(self):
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""" Enable capture on this packet-generator interface"""
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try:
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if os.path.isfile(self.out_path):
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os.rename(self.out_path,
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"%s/history.[timestamp:%f].[%s-counter:%04d].%s" %
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(self.test.tempdir,
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time.time(),
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self.name,
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self.out_history_counter,
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self._out_file))
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except:
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pass
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# FIXME this should be an API, but no such exists atm
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self.test.vapi.cli(self.capture_cli)
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def add_stream(self, pkts):
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"""
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Add a stream of packets to this packet-generator
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:param pkts: iterable packets
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"""
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try:
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if os.path.isfile(self.in_path):
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os.rename(self.in_path,
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"%s/history.[timestamp:%f].[%s-counter:%04d].%s" %
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(self.test.tempdir,
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time.time(),
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self.name,
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self.in_history_counter,
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self._in_file))
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except:
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pass
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wrpcap(self.in_path, pkts)
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# FIXME this should be an API, but no such exists atm
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self.test.vapi.cli(self.input_cli)
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self.test.pg_streams.append(self.cap_name)
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self.test.vapi.cli("trace add pg-input %d" % len(pkts))
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def get_capture(self):
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"""
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Get captured packets
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:returns: iterable packets
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"""
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try:
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output = rdpcap(self.out_path)
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except IOError: # TODO
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self.test.logger.error("File %s does not exist, probably because no"
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" packets arrived" % self.out_path)
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return []
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return output
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def create_arp_req(self):
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"""Create ARP request applicable for this interface"""
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return (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.remote_mac) /
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ARP(op=ARP.who_has, pdst=self.local_ip4,
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psrc=self.remote_ip4, hwsrc=self.remote_mac))
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def create_ndp_req(self):
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"""Create NDP - NS applicable for this interface"""
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return (Ether(dst="ff:ff:ff:ff:ff:ff", src=self.remote_mac) /
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IPv6(src=self.remote_ip6, dst=self.local_ip6) /
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ICMPv6ND_NS(tgt=self.local_ip6) /
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ICMPv6NDOptSrcLLAddr(lladdr=self.remote_mac))
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def resolve_arp(self, pg_interface=None):
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"""Resolve ARP using provided packet-generator interface
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:param pg_interface: interface used to resolve, if None then this
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interface is used
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"""
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if pg_interface is None:
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pg_interface = self
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self.test.logger.info("Sending ARP request for %s on port %s" %
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(self.local_ip4, pg_interface.name))
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arp_req = self.create_arp_req()
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pg_interface.add_stream(arp_req)
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pg_interface.enable_capture()
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self.test.pg_start()
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self.test.logger.info(self.test.vapi.cli("show trace"))
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arp_reply = pg_interface.get_capture()
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if arp_reply is None or len(arp_reply) == 0:
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self.test.logger.info(
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"No ARP received on port %s" %
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pg_interface.name)
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return
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arp_reply = arp_reply[0]
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# Make Dot1AD packet content recognizable to scapy
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if arp_reply.type == 0x88a8:
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arp_reply.type = 0x8100
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arp_reply = Ether(str(arp_reply))
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try:
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if arp_reply[ARP].op == ARP.is_at:
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self.test.logger.info("VPP %s MAC address is %s " %
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(self.name, arp_reply[ARP].hwsrc))
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self._local_mac = arp_reply[ARP].hwsrc
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else:
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self.test.logger.info(
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"No ARP received on port %s" %
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pg_interface.name)
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except:
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self.test.logger.error(
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ppp("Unexpected response to ARP request:", arp_reply))
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raise
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def resolve_ndp(self, pg_interface=None):
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"""Resolve NDP using provided packet-generator interface
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:param pg_interface: interface used to resolve, if None then this
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interface is used
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"""
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if pg_interface is None:
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pg_interface = self
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self.test.logger.info("Sending NDP request for %s on port %s" %
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(self.local_ip6, pg_interface.name))
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ndp_req = self.create_ndp_req()
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pg_interface.add_stream(ndp_req)
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pg_interface.enable_capture()
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self.test.pg_start()
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self.test.logger.info(self.test.vapi.cli("show trace"))
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ndp_reply = pg_interface.get_capture()
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if ndp_reply is None or len(ndp_reply) == 0:
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self.test.logger.info(
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"No NDP received on port %s" %
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pg_interface.name)
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return
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ndp_reply = ndp_reply[0]
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# Make Dot1AD packet content recognizable to scapy
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if ndp_reply.type == 0x88a8:
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ndp_reply.type = 0x8100
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ndp_reply = Ether(str(ndp_reply))
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try:
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ndp_na = ndp_reply[ICMPv6ND_NA]
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opt = ndp_na[ICMPv6NDOptDstLLAddr]
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self.test.logger.info("VPP %s MAC address is %s " %
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(self.name, opt.lladdr))
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self._local_mac = opt.lladdr
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except:
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self.test.logger.error(
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ppp("Unexpected response to NDP request:", ndp_reply))
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raise
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