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diff --git a/tests/sys/netpfil/pf/fragmentation.sh b/tests/sys/netpfil/pf/fragmentation.sh
--- a/tests/sys/netpfil/pf/fragmentation.sh
+++ b/tests/sys/netpfil/pf/fragmentation.sh
@@ -141,8 +141,57 @@
pft_cleanup
}
+atf_test_case "mtu_diff" "cleanup"
+mtu_diff_head()
+{
+ atf_set descr 'Test reassembly across different MTUs, PR #255432'
+ atf_set require.user root
+}
+
+mtu_diff_body()
+{
+ pft_init
+
+ epair_small=$(vnet_mkepair)
+ epair_large=$(vnet_mkepair)
+
+ vnet_mkjail first ${epair_small}b ${epair_large}a
+ vnet_mkjail second ${epair_large}b
+
+ ifconfig ${epair_small}a 192.0.2.1/25 up
+ jexec first ifconfig ${epair_small}b 192.0.2.2/25 up
+
+ jexec first sysctl net.inet.ip.forwarding=1
+ jexec first ifconfig ${epair_large}a 192.0.2.130/25 up
+ jexec first ifconfig ${epair_large}a mtu 9000
+ jexec second ifconfig ${epair_large}b 192.0.2.131/25 up
+ jexec second ifconfig ${epair_large}b mtu 9000
+ jexec second route add default 192.0.2.130
+
+ route add 192.0.2.128/25 192.0.2.2
+
+ jexec first pfctl -e
+ pft_set_rules first \
+ "scrub all fragment reassemble"
+
+ # Sanity checks
+ atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
+ atf_check -s exit:0 -o ignore ping -c 1 192.0.2.130
+ atf_check -s exit:0 -o ignore ping -c 1 192.0.2.131
+
+ # Large packet that'll get reassembled and sent out in one on the large
+ # epair
+ atf_check -s exit:0 -o ignore ping -c 1 -s 8000 192.0.2.131
+}
+
+mtu_diff_cleanup()
+{
+ pft_cleanup
+}
+
atf_init_test_cases()
{
atf_add_test_case "too_many_fragments"
atf_add_test_case "v6"
+ atf_add_test_case "mtu_diff"
}

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