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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
@@ -53,6 +53,7 @@
tos
ATF_TESTS_PYTEST+= frag6.py
+ATF_TESTS_PYTEST+= icmp.py
ATF_TESTS_PYTEST+= nat66.py
ATF_TESTS_PYTEST+= sctp.py
diff --git a/tests/sys/netpfil/pf/icmp.py b/tests/sys/netpfil/pf/icmp.py
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/pf/icmp.py
@@ -0,0 +1,126 @@
+#
+# 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 pytest
+import subprocess
+import re
+from atf_python.sys.net.tools import ToolsHelper
+from atf_python.sys.net.vnet import VnetTestTemplate
+
+def check(cmd):
+ ps = subprocess.Popen(cmd, shell=True)
+ ret = ps.wait()
+ if ret != 0:
+ raise Exception("Command %s returned %d" % (cmd, ret))
+
+class TestICMP(VnetTestTemplate):
+ REQUIRED_MODULES = [ "pf" ]
+ TOPOLOGY = {
+ "vnet1": {"ifaces": ["if1"]},
+ "vnet2": {"ifaces": ["if1", "if2"]},
+ "vnet3": {"ifaces": ["if2"]},
+ "if1": {"prefixes4": [("192.0.2.2/24", "192.0.2.1/24")]},
+ "if2": {"prefixes4": [("198.51.100.1/24", "198.51.100.2/24")]},
+ }
+
+ def vnet2_handler(self, vnet):
+ ifname = vnet.iface_alias_map["if1"].name
+
+ ToolsHelper.print_output("/sbin/pfctl -e")
+ ToolsHelper.pf_rules([
+ "set reassemble yes",
+ "block",
+ "pass inet proto icmp icmp-type echoreq",
+ ])
+
+ ToolsHelper.print_output("/sbin/sysctl net.inet.ip.forwarding=1")
+ ToolsHelper.print_output("/sbin/pfctl -x loud")
+
+ def vnet3_handler(self, vnet):
+ # Import in the correct vnet, so at to not confuse Scapy
+ import scapy.all as sp
+
+ ifname = vnet.iface_alias_map["if2"].name
+ ToolsHelper.print_output("/sbin/route add default 198.51.100.1")
+ ToolsHelper.print_output("/sbin/ifconfig %s inet alias 198.51.100.3/24" % ifname)
+
+ def checkfn(packet):
+ icmp = packet.getlayer(sp.ICMP)
+ if not icmp:
+ return False
+
+ if icmp.type != 3:
+ return False
+
+ packet.show()
+ return True
+
+ sp.sniff(iface=ifname, stop_filter=checkfn)
+ vnet.pipe.send("Got ICMP destination unreachable packet")
+
+ @pytest.mark.require_user("root")
+ def test_inner_match(self):
+ vnet = self.vnet_map["vnet1"]
+ dst_vnet = self.vnet_map["vnet3"]
+ sendif = vnet.iface_alias_map["if1"].name
+
+ our_mac = ToolsHelper.get_output("/sbin/ifconfig %s ether | awk '/ether/ { print $2; }'" % sendif)
+ dst_mac = re.sub("0a$", "0b", our_mac)
+
+ # Import in the correct vnet, so at to not confuse Scapy
+ import scapy.all as sp
+
+ ToolsHelper.print_output("/sbin/route add default 192.0.2.1")
+
+ # Sanity check
+ check("/sbin/ping -c 1 192.0.2.1")
+ check("/sbin/ping -c 1 198.51.100.1")
+ check("/sbin/ping -c 2 198.51.100.3")
+
+ # Establish a state
+ pkt = sp.Ether(src=our_mac, dst=dst_mac) \
+ / sp.IP(src="192.0.2.2", dst="198.51.100.2") \
+ / sp.ICMP(type='echo-request') \
+ / "PAYLOAD"
+ sp.sendp(pkt, sendif, verbose=False)
+
+ # Now try to pass an ICMP error message piggy-backing on that state, but
+ # use a different source address
+ pkt = sp.Ether(src=our_mac, dst=dst_mac) \
+ / sp.IP(src="192.0.2.2", dst="198.51.100.3") \
+ / sp.ICMP(type='dest-unreach') \
+ / sp.IP(src="198.51.100.2", dst="192.0.2.2") \
+ / sp.ICMP(type='echo-reply')
+ sp.sendp(pkt, sendif, verbose=False)
+
+ try:
+ rcvd = self.wait_object(dst_vnet.pipe, timeout=1)
+ if rcvd:
+ raise Exception(rcvd)
+ except TimeoutError as e:
+ # We expect the timeout here. It means we didn't get the destination
+ # unreachable packet in vnet3
+ pass

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