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#
# 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)
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"])
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):
packet = sp.IPv6(src="2001:db8::2", 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 == "2001:db8::2"
# 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 == "2001:db8::2"
assert err.dst == "2001:db8:1::2"
assert err.nh == 58
found = True
assert found
def check_icmp_echo(self, sp, payload_size):
packet = sp.IPv6(src="2001:db8::2", 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 == "2001:db8::2"
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)
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