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-rw-r--r--test/test_mtu.py73
1 files changed, 38 insertions, 35 deletions
diff --git a/test/test_mtu.py b/test/test_mtu.py
index 27594e55727..922d83dc5ef 100644
--- a/test/test_mtu.py
+++ b/test/test_mtu.py
@@ -24,7 +24,8 @@ from util import reassemble4
class TestMTU(VppTestCase):
- """ MTU Test Case """
+ """MTU Test Case"""
+
maxDiff = None
@classmethod
@@ -62,7 +63,7 @@ class TestMTU(VppTestCase):
self.assertEqual(rx, expected)
def payload(self, len):
- return 'x' * len
+ return "x" * len
def get_mtu(self, sw_if_index):
rv = self.vapi.sw_interface_dump(sw_if_index=sw_if_index)
@@ -72,21 +73,19 @@ class TestMTU(VppTestCase):
return 0
def test_ip4_mtu(self):
- """ IP4 MTU test """
+ """IP4 MTU test"""
p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
- p_ip4 = IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4,
- flags='DF')
+ p_ip4 = IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, flags="DF")
current_mtu = self.get_mtu(self.pg1.sw_if_index)
- p_payload = UDP(sport=1234, dport=1234) / self.payload(
- current_mtu - 20 - 8)
+ p_payload = UDP(sport=1234, dport=1234) / self.payload(current_mtu - 20 - 8)
p4 = p_ether / p_ip4 / p_payload
p4_reply = p_ip4 / p_payload
p4_reply.ttl -= 1
- rx = self.send_and_expect(self.pg0, p4*11, self.pg1)
+ rx = self.send_and_expect(self.pg0, p4 * 11, self.pg1)
for p in rx:
self.validate(p[1], p4_reply)
@@ -95,16 +94,22 @@ class TestMTU(VppTestCase):
self.assertEqual(576, self.get_mtu(self.pg1.sw_if_index))
# Should fail. Too large MTU
- p_icmp4 = ICMP(type='dest-unreach', code='fragmentation-needed',
- nexthopmtu=576, chksum=0x2dbb)
- icmp4_reply = (IP(src=self.pg0.local_ip4,
- dst=self.pg0.remote_ip4,
- ttl=254, len=576, id=0) /
- p_icmp4 / p_ip4 / p_payload)
+ p_icmp4 = ICMP(
+ type="dest-unreach",
+ code="fragmentation-needed",
+ nexthopmtu=576,
+ chksum=0x2DBB,
+ )
+ icmp4_reply = (
+ IP(src=self.pg0.local_ip4, dst=self.pg0.remote_ip4, ttl=254, len=576, id=0)
+ / p_icmp4
+ / p_ip4
+ / p_payload
+ )
n = icmp4_reply.__class__(icmp4_reply)
s = bytes(icmp4_reply)
icmp4_reply = s[0:576]
- rx = self.send_and_expect_some(self.pg0, p4*11, self.pg0)
+ rx = self.send_and_expect_some(self.pg0, p4 * 11, self.pg0)
for p in rx:
# p.show2()
# n.show2()
@@ -112,8 +117,7 @@ class TestMTU(VppTestCase):
# Now with DF off. Expect fragments.
# First go with 1500 byte packets.
- p_payload = UDP(sport=1234, dport=1234) / self.payload(
- 1500 - 20 - 8)
+ p_payload = UDP(sport=1234, dport=1234) / self.payload(1500 - 20 - 8)
p4 = p_ether / p_ip4 / p_payload
p4.flags = 0
p4_reply = p_ip4 / p_payload
@@ -121,13 +125,13 @@ class TestMTU(VppTestCase):
p4_reply.flags = 0
p4_reply.id = 256
self.pg_enable_capture()
- self.pg0.add_stream(p4*1)
+ self.pg0.add_stream(p4 * 1)
self.pg_start()
rx = self.pg1.get_capture(3)
reass_pkt = reassemble4(rx)
self.validate(reass_pkt, p4_reply)
- '''
+ """
# Now what happens with a 9K frame
p_payload = UDP(sport=1234, dport=1234) / self.payload(
current_mtu - 20 - 8)
@@ -146,27 +150,25 @@ class TestMTU(VppTestCase):
reass_pkt.show2()
p4_reply.show2()
self.validate(reass_pkt, p4_reply)
- '''
+ """
# Reset MTU
- self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index,
- [current_mtu, 0, 0, 0])
+ self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [current_mtu, 0, 0, 0])
def test_ip6_mtu(self):
- """ IP6 MTU test """
+ """IP6 MTU test"""
current_mtu = self.get_mtu(self.pg1.sw_if_index)
p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
p_ip6 = IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6)
- p_payload = UDP(sport=1234, dport=1234) / self.payload(
- current_mtu - 40 - 8)
+ p_payload = UDP(sport=1234, dport=1234) / self.payload(current_mtu - 40 - 8)
p6 = p_ether / p_ip6 / p_payload
p6_reply = p_ip6 / p_payload
p6_reply.hlim -= 1
- rx = self.send_and_expect(self.pg0, p6*9, self.pg1)
+ rx = self.send_and_expect(self.pg0, p6 * 9, self.pg1)
for p in rx:
self.validate(p[1], p6_reply)
@@ -175,24 +177,25 @@ class TestMTU(VppTestCase):
self.assertEqual(1280, self.get_mtu(self.pg1.sw_if_index))
# Should fail. Too large MTU
- p_icmp6 = ICMPv6PacketTooBig(mtu=1280, cksum=0x4c7a)
- icmp6_reply = (IPv6(src=self.pg0.local_ip6,
- dst=self.pg0.remote_ip6,
- hlim=255, plen=1240) /
- p_icmp6 / p_ip6 / p_payload)
+ p_icmp6 = ICMPv6PacketTooBig(mtu=1280, cksum=0x4C7A)
+ icmp6_reply = (
+ IPv6(src=self.pg0.local_ip6, dst=self.pg0.remote_ip6, hlim=255, plen=1240)
+ / p_icmp6
+ / p_ip6
+ / p_payload
+ )
icmp6_reply[2].hlim -= 1
n = icmp6_reply.__class__(icmp6_reply)
s = bytes(icmp6_reply)
icmp6_reply_str = s[0:1280]
- rx = self.send_and_expect_some(self.pg0, p6*9, self.pg0)
+ rx = self.send_and_expect_some(self.pg0, p6 * 9, self.pg0)
for p in rx:
self.validate_bytes(bytes(p[1]), icmp6_reply_str)
# Reset MTU
- self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index,
- [current_mtu, 0, 0, 0])
+ self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [current_mtu, 0, 0, 0])
-if __name__ == '__main__':
+if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)