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-rw-r--r--test/test_ip4.py50
1 files changed, 50 insertions, 0 deletions
diff --git a/test/test_ip4.py b/test/test_ip4.py
index e9ec71a2830..ca461f1d276 100644
--- a/test/test_ip4.py
+++ b/test/test_ip4.py
@@ -1554,5 +1554,55 @@ class TestIPLPM(VppTestCase):
rx = self.send_and_expect(self.pg0, p_24 * 65, self.pg1)
+class TestIPv4Frag(VppTestCase):
+ """ IPv4 fragmentation """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestIPv4Frag, cls).setUpClass()
+
+ cls.create_pg_interfaces([0, 1])
+ cls.src_if = cls.pg0
+ cls.dst_if = cls.pg1
+
+ # setup all interfaces
+ for i in cls.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+
+ def test_frag_large_packets(self):
+ """ Fragmentation of large packets """
+
+ p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IP(src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) /
+ UDP(sport=1234, dport=5678) / Raw())
+ self.extend_packet(p, 6000, "abcde")
+ saved_payload = p[Raw].load
+
+ # Force fragmentation by setting MTU of output interface
+ # lower than packet size
+ self.vapi.sw_interface_set_mtu(self.dst_if.sw_if_index,
+ [5000, 0, 0, 0])
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(p)
+ self.pg_start()
+
+ # Expecting 3 fragments because size of created fragments currently
+ # cannot be larger then VPP buffer size (which is 2048)
+ packets = self.dst_if.get_capture(3)
+
+ # Assume VPP sends the fragments in order
+ payload = ''
+ for p in packets:
+ payload_offset = p.frag * 8
+ if payload_offset > 0:
+ payload_offset -= 8 # UDP header is not in payload
+ self.assert_equal(payload_offset, len(payload))
+ payload += p[Raw].load
+ self.assert_equal(payload, saved_payload, "payload")
+
+
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)