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diff --git a/tests/sys/netpfil/pf/killstate.sh b/tests/sys/netpfil/pf/killstate.sh
--- a/tests/sys/netpfil/pf/killstate.sh
+++ b/tests/sys/netpfil/pf/killstate.sh
@@ -447,6 +447,65 @@
pft_cleanup
}
+atf_test_case "interface" "cleanup"
+interface_head()
+{
+ atf_set descr 'Test killing states based on interface'
+ atf_set require.user root
+ atf_set require.progs scapy
+}
+
+interface_body()
+{
+ pft_init
+
+ epair=$(vnet_mkepair)
+ ifconfig ${epair}a 192.0.2.1/24 up
+
+ vnet_mkjail alcatraz ${epair}b
+ jexec alcatraz ifconfig ${epair}b 192.0.2.2/24 up
+ jexec alcatraz pfctl -e
+
+ pft_set_rules alcatraz "block all" \
+ "pass in proto icmp"
+
+ # Sanity check & establish state
+ # Note: use pft_ping so we always use the same ID, so pf considers all
+ # echo requests part of the same flow.
+ atf_check -s exit:0 -o ignore ${common_dir}/pft_ping.py \
+ --sendif ${epair}a \
+ --to 192.0.2.2 \
+ --replyif ${epair}a
+
+ # Change rules to now deny the ICMP traffic
+ pft_set_rules noflush alcatraz "block all"
+
+ # Established state means we can still ping alcatraz
+ atf_check -s exit:0 -o ignore ${common_dir}/pft_ping.py \
+ --sendif ${epair}a \
+ --to 192.0.2.2 \
+ --replyif ${epair}a
+
+ # Flushing states on a different interface doesn't affect our state
+ jexec alcatraz pfctl -i ${epair}a -Fs
+ atf_check -s exit:0 -o ignore ${common_dir}/pft_ping.py \
+ --sendif ${epair}a \
+ --to 192.0.2.2 \
+ --replyif ${epair}a
+
+ # Flushing on the correct interface does (even with floating states)
+ jexec alcatraz pfctl -i ${epair}b -Fs
+ atf_check -s exit:1 -o ignore ${common_dir}/pft_ping.py \
+ --sendif ${epair}a \
+ --to 192.0.2.2 \
+ --replyif ${epair}a
+}
+
+interface_cleanup()
+{
+ pft_cleanup
+}
+
atf_init_test_cases()
{
atf_add_test_case "v4"
@@ -455,4 +514,5 @@
atf_add_test_case "multilabel"
atf_add_test_case "gateway"
atf_add_test_case "match"
+ atf_add_test_case "interface"
}

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