# # SPDX-License-Identifier: BSD-2-Clause # # Copyright (c) 2024 Rubicon Communications, LLC (Netgate) # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. import ctypes import ipaddress import pytest import re import socket import threading import time from atf_python.sys.net.tools import ToolsHelper from atf_python.sys.net.vnet import VnetTestTemplate class DelayedSend(threading.Thread): def __init__(self, packet): threading.Thread.__init__(self) self._packet = packet self.start() def run(self): import scapy.all as sp time.sleep(1) sp.send(self._packet) class TestNAT66(VnetTestTemplate): REQUIRED_MODUES = [ "pf" ] TOPOLOGY = { "vnet1": {"ifaces": ["if1"]}, "vnet2": {"ifaces": ["if1", "if2"]}, "vnet3": {"ifaces": ["if2"]}, "if1": {"prefixes6": [("2001:db8::2/64", "2001:db8::1/64")]}, "if2": {"prefixes6": [("2001:db8:1::1/64", "2001:db8:1::2/64")]}, } def vnet2_handler(self, vnet): ifname = vnet.iface_alias_map["if1"].name ToolsHelper.print_output("/sbin/ifconfig %s mtu 9000" % ifname) outifname = vnet.iface_alias_map["if2"].name ToolsHelper.print_output("/sbin/pfctl -e") ToolsHelper.pf_rules([ "set reassemble yes", "binat inet6 from 2001:db8::/64 to 2001:db8:1::/64 -> 2001:db8:42::/64", "binat inet6 from 2001:db8:1::/64 to 2001:db8:42::/64 -> 2001:db8::/64", "pass inet6 proto icmp6", "pass in route-to ( %s 2001:db8:1::2 ) inet6 from 2001:db8::3 to 2001:db8:1::/64" % outifname]) ToolsHelper.print_output("/sbin/sysctl net.inet6.ip6.forwarding=1") def vnet3_handler(self, vnet): ToolsHelper.print_output("/sbin/route add -6 2001:db8:42::/64 2001:db8:1::1") def check_icmp_too_big(self, sp, payload_size, frag_size=None, src="2001:db8::2"): packet = sp.IPv6(src=src, dst="2001:db8:1::2") \ / sp.ICMPv6EchoRequest(data=sp.raw(bytes.fromhex('f0') * payload_size)) if frag_size is not None: packet = sp.fragment6(packet, frag_size) # Delay the send so the sniffer is running when we transmit. s = DelayedSend(packet) packets = sp.sniff(iface=self.vnet.iface_alias_map["if1"].name, timeout=3) found=False for p in packets: # We can't get a reply to this assert not p.getlayer(sp.ICMPv6EchoReply) if not p.getlayer(sp.ICMPv6PacketTooBig): continue ip6 = p.getlayer(sp.IPv6) icmp6 = p.getlayer(sp.ICMPv6PacketTooBig) # Error is from the router vnet assert ip6.src == "2001:db8::1" assert ip6.dst == src # And the relevant MTU is 1500 assert icmp6.mtu == 1500 # The icmp6 error contains our original IPv6 packet err = icmp6.getlayer(sp.IPerror6) assert err.src == src assert err.dst == "2001:db8:1::2" assert err.nh == 58 found = True assert found def check_icmp_echo(self, sp, payload_size, src="2001:db8::2"): packet = sp.IPv6(src=src, dst="2001:db8:1::2") \ / sp.ICMPv6EchoRequest(data=sp.raw(bytes.fromhex('f0') * payload_size)) # Delay the send so the sniffer is running when we transmit. s = DelayedSend(packet) packets = sp.sniff(iface=self.vnet.iface_alias_map["if1"].name, timeout=3) found=False for p in packets: if not p.getlayer(sp.ICMPv6EchoReply): continue ip6 = p.getlayer(sp.IPv6) icmp6 = p.getlayer(sp.ICMPv6EchoReply) # Error is from the router vnet assert ip6.src == "2001:db8:1::2" assert ip6.dst == src found = True assert found @pytest.mark.require_user("root") def test_npt_icmp(self): cl_vnet = self.vnet_map["vnet1"] ifname = cl_vnet.iface_alias_map["if1"].name ToolsHelper.print_output("/sbin/ifconfig %s mtu 9000" % ifname) ToolsHelper.print_output("/sbin/route add -6 2001:db8:1::/64 2001:db8::1") # For unclear reasons vnet3 doesn't respond to the first ping. # Just send two for now. ToolsHelper.print_output("/sbin/ping -6 -c 1 2001:db8:1::2") ToolsHelper.print_output("/sbin/ping -6 -c 1 2001:db8:1::2") # Import in the correct vnet, so at to not confuse Scapy import scapy.all as sp # A ping that easily passes without fragmentation self.check_icmp_echo(sp, 128) # Send a ping that just barely doesn't need to be fragmented self.check_icmp_echo(sp, 1452) # Send a ping that just barely needs to be fragmented self.check_icmp_too_big(sp, 1453) # A ping that arrives fragmented self.check_icmp_too_big(sp, 12000, 5000) @pytest.mark.require_user("root") def test_npt_route_to_icmp(self): cl_vnet = self.vnet_map["vnet1"] ifname = cl_vnet.iface_alias_map["if1"].name ToolsHelper.print_output("/sbin/ifconfig %s mtu 9000" % ifname) ToolsHelper.print_output("/sbin/ifconfig %s inet6 alias 2001:db8::3/64" % ifname) ToolsHelper.print_output("/sbin/route add -6 2001:db8:1::/64 2001:db8::1") # For unclear reasons vnet3 doesn't respond to the first ping. # Just send two for now. ToolsHelper.print_output("/sbin/ping -6 -c 1 -S 2001:db8::3 2001:db8:1::2") ToolsHelper.print_output("/sbin/ping -6 -c 1 -S 2001:db8::3 2001:db8:1::2") # Import in the correct vnet, so at to not confuse Scapy import scapy.all as sp # A ping that easily passes without fragmentation self.check_icmp_echo(sp, 128, src="2001:db8::3") # Send a ping that just barely doesn't need to be fragmented self.check_icmp_echo(sp, 1452, src="2001:db8::3") # Send a ping that just barely needs to be fragmented self.check_icmp_too_big(sp, 1453, src="2001:db8::3") # A ping that arrives fragmented self.check_icmp_too_big(sp, 12000, 5000, src="2001:db8::3")