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diff --git a/tests/sys/netpfil/pf/Makefile b/tests/sys/netpfil/pf/Makefile
--- a/tests/sys/netpfil/pf/Makefile
+++ b/tests/sys/netpfil/pf/Makefile
@@ -46,6 +46,7 @@
tos
ATF_TESTS_PYTEST+= frag6.py
+ATF_TESTS_PYTEST+= nat66.py
ATF_TESTS_PYTEST+= sctp.py
# Tests reuse jail names and so cannot run in parallel.
diff --git a/tests/sys/netpfil/pf/nat66.py b/tests/sys/netpfil/pf/nat66.py
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/pf/nat66.py
@@ -0,0 +1,166 @@
+#
+# 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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