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-rw-r--r--src/plugins/mss_clamp/test/test_mss_clamp.py295
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diff --git a/src/plugins/mss_clamp/test/test_mss_clamp.py b/src/plugins/mss_clamp/test/test_mss_clamp.py
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+++ b/src/plugins/mss_clamp/test/test_mss_clamp.py
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+#!/usr/bin/env python3
+
+import unittest
+
+from framework import VppTestCase, VppTestRunner
+
+from scapy.layers.inet import IP, TCP
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+
+class TestMSSClamp(VppTestCase):
+ """ TCP MSS Clamping Test Case """
+
+ def setUp(self):
+ super(TestMSSClamp, self).setUp()
+
+ # create 2 pg interfaces
+ self.create_pg_interfaces(range(2))
+
+ for i in self.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+ i.config_ip6()
+ i.resolve_ndp()
+
+ def tearDown(self):
+ for i in self.pg_interfaces:
+ i.unconfig_ip4()
+ i.unconfig_ip6()
+ i.admin_down()
+ super(TestMSSClamp, self).tearDown()
+
+ def verify_pkt(self, rx, expected_mss):
+ # check that the MSS size equals the expected value
+ # and the IP and TCP checksums are correct
+ tcp = rx[TCP]
+ tcp_csum = tcp.chksum
+ del tcp.chksum
+ ip_csum = 0
+ if (rx.haslayer(IP)):
+ ip_csum = rx[IP].chksum
+ del rx[IP].chksum
+
+ opt = tcp.options
+ self.assertEqual(opt[0][0], 'MSS')
+ self.assertEqual(opt[0][1], expected_mss)
+ # recalculate checksums
+ rx = rx.__class__(bytes(rx))
+ tcp = rx[TCP]
+ self.assertEqual(tcp_csum, tcp.chksum)
+ if (rx.haslayer(IP)):
+ self.assertEqual(ip_csum, rx[IP].chksum)
+
+ def send_and_verify_ip4(self, src_pg, dst_pg, mss, expected_mss):
+ # IPv4 TCP packet with the requested MSS option.
+ # from a host on src_pg to a host on dst_pg.
+ p = (Ether(dst=src_pg.local_mac,
+ src=src_pg.remote_mac) /
+ IP(src=src_pg.remote_ip4,
+ dst=dst_pg.remote_ip4) /
+ TCP(sport=1234, dport=1234,
+ flags="S",
+ options=[('MSS', (mss)), ('EOL', None)]) /
+ Raw('\xa5' * 100))
+
+ rxs = self.send_and_expect(src_pg, p * 65, dst_pg)
+
+ for rx in rxs:
+ self.verify_pkt(rx, expected_mss)
+
+ def send_and_verify_ip6(self, src_pg, dst_pg, mss, expected_mss):
+ #
+ # IPv6 TCP packet with the requested MSS option.
+ # from a host on src_pg to a host on dst_pg.
+ #
+ p = (Ether(dst=src_pg.local_mac,
+ src=src_pg.remote_mac) /
+ IPv6(src=src_pg.remote_ip6,
+ dst=dst_pg.remote_ip6) /
+ TCP(sport=1234, dport=1234,
+ flags="S",
+ options=[('MSS', (mss)), ('EOL', None)]) /
+ Raw('\xa5' * 100))
+
+ rxs = self.send_and_expect(src_pg, p * 65, dst_pg)
+
+ for rx in rxs:
+ self.verify_pkt(rx, expected_mss)
+
+ def test_tcp_mss_clamping_ip4_tx(self):
+ """ IP4 TCP MSS Clamping TX """
+
+ # enable the TCP MSS clamping feature to lower the MSS to 1424.
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1424, ipv6_mss=0,
+ ipv4_direction=3, ipv6_direction=0)
+
+ # Verify that the feature is enabled.
+ rv, reply = self.vapi.mss_clamp_get(sw_if_index=self.pg1.sw_if_index)
+ self.assertEqual(reply[0].ipv4_mss, 1424)
+ self.assertEqual(reply[0].ipv4_direction, 3)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip4(self.pg0, self.pg1, 1460, 1424)
+
+ # check the stats
+ stats = self.statistics.get_counter(
+ '/err/tcp-mss-clamping-ip4-out/clamped')
+ self.assertEqual(sum(stats), 65)
+
+ # Send syn packets with small enough MSS values and verify they are
+ # unchanged.
+ self.send_and_verify_ip4(self.pg0, self.pg1, 1400, 1400)
+
+ # enable the the feature only in TX direction
+ # and change the max MSS value
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1420, ipv6_mss=0,
+ ipv4_direction=2, ipv6_direction=0)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip4(self.pg0, self.pg1, 1460, 1420)
+
+ # enable the the feature only in RX direction
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1424, ipv6_mss=0,
+ ipv4_direction=1, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip4(self.pg0, self.pg1, 1460, 1460)
+
+ # disable the feature
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=0,
+ ipv4_direction=0, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip4(self.pg0, self.pg1, 1460, 1460)
+
+ def test_tcp_mss_clamping_ip4_rx(self):
+ """ IP4 TCP MSS Clamping RX """
+
+ # enable the TCP MSS clamping feature to lower the MSS to 1424.
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1424, ipv6_mss=0,
+ ipv4_direction=3, ipv6_direction=0)
+
+ # Verify that the feature is enabled.
+ rv, reply = self.vapi.mss_clamp_get(sw_if_index=self.pg1.sw_if_index)
+ self.assertEqual(reply[0].ipv4_mss, 1424)
+ self.assertEqual(reply[0].ipv4_direction, 3)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip4(self.pg1, self.pg0, 1460, 1424)
+
+ # check the stats
+ stats = self.statistics.get_counter(
+ '/err/tcp-mss-clamping-ip4-in/clamped')
+ self.assertEqual(sum(stats), 65)
+
+ # Send syn packets with small enough MSS values and verify they are
+ # unchanged.
+ self.send_and_verify_ip4(self.pg1, self.pg0, 1400, 1400)
+
+ # enable the the feature only in RX direction
+ # and change the max MSS value
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1420, ipv6_mss=0,
+ ipv4_direction=1, ipv6_direction=0)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip4(self.pg1, self.pg0, 1460, 1420)
+
+ # enable the the feature only in TX direction
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=1424, ipv6_mss=0,
+ ipv4_direction=2, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip4(self.pg1, self.pg0, 1460, 1460)
+
+ # disable the feature
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=0,
+ ipv4_direction=0, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip4(self.pg1, self.pg0, 1460, 1460)
+
+ def test_tcp_mss_clamping_ip6_tx(self):
+ """ IP6 TCP MSS Clamping TX """
+
+ # enable the TCP MSS clamping feature to lower the MSS to 1424.
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1424,
+ ipv4_direction=0, ipv6_direction=3)
+
+ # Verify that the feature is enabled.
+ rv, reply = self.vapi.mss_clamp_get(sw_if_index=self.pg1.sw_if_index)
+ self.assertEqual(reply[0].ipv6_mss, 1424)
+ self.assertEqual(reply[0].ipv6_direction, 3)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip6(self.pg0, self.pg1, 1460, 1424)
+
+ # check the stats
+ stats = self.statistics.get_counter(
+ '/err/tcp-mss-clamping-ip6-out/clamped')
+ self.assertEqual(sum(stats), 65)
+
+ # Send syn packets with small enough MSS values and verify they are
+ # unchanged.
+ self.send_and_verify_ip6(self.pg0, self.pg1, 1400, 1400)
+
+ # enable the the feature only in TX direction
+ # and change the max MSS value
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1420,
+ ipv4_direction=0, ipv6_direction=2)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip6(self.pg0, self.pg1, 1460, 1420)
+
+ # enable the the feature only in RX direction
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1424,
+ ipv4_direction=0, ipv6_direction=1)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip6(self.pg0, self.pg1, 1460, 1460)
+
+ # disable the feature
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=0,
+ ipv4_direction=0, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip6(self.pg0, self.pg1, 1460, 1460)
+
+ def test_tcp_mss_clamping_ip6_rx(self):
+ """ IP6 TCP MSS Clamping RX """
+
+ # enable the TCP MSS clamping feature to lower the MSS to 1424.
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1424,
+ ipv4_direction=0, ipv6_direction=3)
+
+ # Verify that the feature is enabled.
+ rv, reply = self.vapi.mss_clamp_get(sw_if_index=self.pg1.sw_if_index)
+ self.assertEqual(reply[0].ipv6_mss, 1424)
+ self.assertEqual(reply[0].ipv6_direction, 3)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip6(self.pg1, self.pg0, 1460, 1424)
+
+ # check the stats
+ stats = self.statistics.get_counter(
+ '/err/tcp-mss-clamping-ip6-in/clamped')
+ self.assertEqual(sum(stats), 65)
+
+ # Send syn packets with small enough MSS values and verify they are
+ # unchanged.
+ self.send_and_verify_ip6(self.pg1, self.pg0, 1400, 1400)
+
+ # enable the the feature only in RX direction
+ # and change the max MSS value
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1420,
+ ipv4_direction=0, ipv6_direction=1)
+
+ # Send syn packets and verify that the MSS value is lowered.
+ self.send_and_verify_ip6(self.pg1, self.pg0, 1460, 1420)
+
+ # enable the the feature only in TX direction
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=1424,
+ ipv4_direction=0, ipv6_direction=2)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip6(self.pg1, self.pg0, 1460, 1460)
+
+ # disable the feature
+ self.vapi.mss_clamp_enable_disable(self.pg1.sw_if_index,
+ ipv4_mss=0, ipv6_mss=0,
+ ipv4_direction=0, ipv6_direction=0)
+
+ # Send the packets again and ensure they are unchanged.
+ self.send_and_verify_ip6(self.pg1, self.pg0, 1460, 1460)
+
+
+if __name__ == '__main__':
+ unittest.main(testRunner=VppTestRunner)