tests/ipfw: add a test for ipfw(4) log rules that write to bpf(4)

tests/sys/netpfil/ipfw/Makefile

@@ -4,6 +4,7 @@ TESTSDIR=       ${TESTSBASE}/sys/netpfil/ipfw
 
 ATF_TESTS_SH+=	fwd \
 		divert \
+		log \
 		table
 
 ${PACKAGE}FILES+=	fwd_inetd.conf

tests/sys/netpfil/ipfw/log.sh

@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2026 Gleb Smirnoff <glebius@FreeBSD.org>
+#
+# 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.
+
+. $(atf_get_srcdir)/../common/utils.subr
+
+atf_test_case "bpf" "cleanup"
+bpf_head()
+{
+	atf_set descr 'Creates several rules with log and probes bpf taps'
+	atf_set require.user root
+}
+
+bpf_body()
+{
+	firewall_init "ipfw"
+
+	epair=$(vnet_mkepair)
+	vnet_mkjail alcatraz ${epair}b
+	ifconfig ${epair}a 192.0.2.0/31 up
+	jexec alcatraz ifconfig ${epair}b 192.0.2.1/31 up
+
+	# Create a bunch of statically and auto numbered logging rules
+	rules="100 200 201"
+	for r in ${rules}; do
+		jexec alcatraz \
+		    ipfw add ${r} count log udp from any to any 10${r}
+	done
+	auto=$(jexec alcatraz ipfw add count log udp from any to any 10666 \
+	    | awk '{print $1}' | sed -Ee 's/^0+//')
+
+	pids=""
+	for r in ${rules} ${auto}; do
+		jexec alcatraz tcpdump --immediate-mode -i ipfw${r} \
+		    -w ${PWD}/${r}.pcap -c 1 &
+		pids="${pids} $!"
+	done
+
+	# wait for tcpdumps to attach, include netstat(1) header in ${count}
+	count=$(( $(echo ${rules} ${auto} | wc -w) + 1))
+	while [ $(jexec alcatraz netstat -B | wc -l) -ne ${count} ]; do
+		sleep 0.01;
+	done
+
+	for p in ${rules} 666; do
+		echo foo | nc -u 192.0.2.1 10${p} -w 0
+	done
+
+	for p in ${pids}; do
+		atf_check -s exit:0 sh -c "wait $pid; exit $?"
+	done
+
+	# statically numbered taps
+	for p in ${rules}; do
+		atf_check -o match:"192.0.2.0.[0-9]+ > 192.0.2.1.10${p}: UDP" \
+		    -e match:"reading from file [a-zA-Z0-9/.]+${p}.pcap" \
+		    tcpdump -nr ${PWD}/${p}.pcap
+	done
+
+	# autonumbered tap with 10666 port
+	atf_check -o match:"192.0.2.0.[0-9]+ > 192.0.2.1.10666: UDP" \
+	    -e match:"reading from file [a-zA-Z0-9/.]+${auto}.pcap" \
+	    tcpdump -nr ${PWD}/${auto}.pcap
+}
+
+bpf_cleanup()
+{
+	firewall_cleanup $1
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "bpf"
+}