class TestMSSClamp(VppTestCase):
- """ TCP MSS Clamping Test Case """
+ """TCP MSS Clamping Test Case"""
def setUp(self):
super(TestMSSClamp, self).setUp()
tcp_csum = tcp.chksum
del tcp.chksum
ip_csum = 0
- if (rx.haslayer(IP)):
+ 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][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)):
+ 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))
+ 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)
# 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))
+ 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)
self.verify_pkt(rx, expected_mss)
def test_tcp_mss_clamping_ip4_tx(self):
- """ IP4 TCP MSS Clamping TX """
+ """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)
+ 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.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')
+ 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
# 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)
+ 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)
+ 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)
+ 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 """
+ """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)
+ 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.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')
+ 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
# 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)
+ 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)
+ 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)
+ 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 """
+ """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)
+ 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.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')
+ 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
# 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)
+ 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)
+ 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)
+ 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 """
+ """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)
+ 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.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')
+ 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
# 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)
+ 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)
+ 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)
+ 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__':
+if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
Code Review / vpp.git / blobdiff