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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
@@ -24,6 +24,7 @@
macro \
map_e \
match \
+ mbuf \
modulate \
names \
nat \
diff --git a/tests/sys/netpfil/pf/mbuf.sh b/tests/sys/netpfil/pf/mbuf.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/pf/mbuf.sh
@@ -0,0 +1,129 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 Igor Ostapenko <pm@igoro.pro>
+#
+# 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.
+
+. $(atf_get_srcdir)/utils.subr
+
+dummymbuf_init()
+{
+ if ! kldstat -q -m dummymbuf; then
+ atf_skip "This test requires dummymbuf"
+ fi
+}
+
+ipfw_init()
+{
+ if ! kldstat -q -m ipfw; then
+ atf_skip "This test requires ipfw"
+ fi
+}
+
+assert_ipfw_is_off()
+{
+ if kldstat -q -m ipfw; then
+ atf_skip "This test is for the case when ipfw is not loaded"
+ fi
+}
+
+atf_test_case "ipfwoff_ip4_in_mbuf_len" "cleanup"
+ipfwoff_ip4_in_mbuf_len_head()
+{
+ atf_set descr 'Test that pf can handle the first mbuf with m_len < sizeof(struct ip), with ipfw disabled'
+ atf_set require.user root
+}
+ipfwoff_ip4_in_mbuf_len_body()
+{
+ local ipfwon=$1
+
+ pft_init
+ dummymbuf_init
+ test $ipfwon && ipfw_init || assert_ipfw_is_off
+
+ epair=$(vnet_mkepair)
+ ifconfig ${epair}a 192.0.2.1/24 up
+
+ # Set up a simple jail with one interface
+ vnet_mkjail alcatraz ${epair}b
+ jexec alcatraz ifconfig ${epair}b 192.0.2.2/24 up
+ test $ipfwon && jexec alcatraz ipfw add 65534 allow all from any to any
+
+ # Sanity check
+ atf_check -s exit:0 -o ignore ping -c3 192.0.2.2
+
+ # Should be denied
+ echo '
+ block
+ ' | jexec alcatraz pfctl -ef-
+ atf_check -s not-exit:0 -o ignore ping -c1 192.0.2.2
+
+ # Should be allowed by from/to addresses
+ echo '
+ block
+ pass in from 192.0.2.1 to 192.0.2.2
+ ' | jexec alcatraz pfctl -ef-
+ atf_check -s exit:0 -o ignore ping -c1 192.0.2.2
+
+ # Should still work for m_len=0
+ jexec alcatraz pfilctl link -i dummymbuf:inet inet
+ jexec alcatraz sysctl net.dummymbuf.rules='inet in epair0b pull-head 0;'
+ atf_check_equal "0" "$(jexec alcatraz sysctl -n net.dummymbuf.hits)"
+ atf_check -s exit:0 -o ignore ping -c1 192.0.2.2
+ atf_check_equal "1" "$(jexec alcatraz sysctl -n net.dummymbuf.hits)"
+
+ # m_len=1
+ jexec alcatraz sysctl net.dummymbuf.rules='inet in epair0b pull-head 1;'
+ atf_check -s exit:0 -o ignore ping -c1 192.0.2.2
+ atf_check_equal "2" "$(jexec alcatraz sysctl -n net.dummymbuf.hits)"
+
+ # m_len=19
+ jexec alcatraz sysctl net.dummymbuf.rules='inet in epair0b pull-head 19;'
+ atf_check -s exit:0 -o ignore ping -c1 192.0.2.2
+ atf_check_equal "3" "$(jexec alcatraz sysctl -n net.dummymbuf.hits)"
+}
+ipfwoff_ip4_in_mbuf_len_cleanup()
+{
+ pft_cleanup
+}
+
+atf_test_case "ipfwon_ip4_in_mbuf_len" "cleanup"
+ipfwon_ip4_in_mbuf_len_head()
+{
+ atf_set descr 'Test that pf can handle the first mbuf with m_len < sizeof(struct ip), with ipfw enabled'
+ atf_set require.user root
+}
+ipfwon_ip4_in_mbuf_len_body()
+{
+ ipfwoff_ip4_in_mbuf_len_body "ipfwon"
+}
+ipfwon_ip4_in_mbuf_len_cleanup()
+{
+ pft_cleanup
+}
+
+atf_init_test_cases()
+{
+ atf_add_test_case "ipfwoff_ip4_in_mbuf_len"
+ atf_add_test_case "ipfwon_ip4_in_mbuf_len"
+}

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