-#!/usr/bin/env python
+#!/usr/bin/env python3
"""IP4 and IP6 MTU functional tests"""
#
import unittest
from scapy.layers.inet6 import IPv6, Ether, IP, UDP, ICMPv6PacketTooBig
from scapy.layers.inet import ICMP
-from framework import VppTestCase, VppTestRunner
-from vpp_ip_route import VppIpRoute, VppRoutePath, DpoProto
-from socket import AF_INET, AF_INET6, inet_pton
-import StringIO
+from framework import VppTestCase
+from asfframework import VppTestRunner
+from util import reassemble4
+
""" Test_mtu is a subclass of VPPTestCase classes.
MTU tests.
"""
-def reassemble(listoffragments):
- buffer = StringIO.StringIO()
- first = listoffragments[0]
- buffer.seek(20)
- for pkt in listoffragments:
- # pkt.show2()
- buffer.seek(pkt[IP].frag*8)
- buffer.write(pkt[IP].payload)
- first.len = len(buffer.getvalue()) + 20
- first.flags = 0
- del(first.chksum)
- header = str(first[IP])[:20]
- return first[IP].__class__(header + buffer.getvalue())
-
-
class TestMTU(VppTestCase):
- """ MTU Test Case """
+ """MTU Test Case"""
+
+ maxDiff = None
@classmethod
def setUpClass(cls):
cls.create_pg_interfaces(range(2))
cls.interfaces = list(cls.pg_interfaces)
- def setUp(cls):
- super(TestMTU, cls).setUp()
- for i in cls.interfaces:
+ @classmethod
+ def tearDownClass(cls):
+ super(TestMTU, cls).tearDownClass()
+
+ def setUp(self):
+ super(TestMTU, self).setUp()
+ for i in self.interfaces:
i.admin_up()
i.config_ip4()
i.config_ip6()
i.admin_down()
def validate(self, rx, expected):
- self.assertEqual(rx, expected.__class__(str(expected)))
+ self.assertEqual(rx, expected.__class__(expected))
def validate_bytes(self, rx, expected):
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()
+ rv = self.vapi.sw_interface_dump(sw_if_index=sw_if_index)
for i in rv:
if i.sw_if_index == sw_if_index:
return i.mtu[0]
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)
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)
- icmp4_reply[1].ttl -= 1
- n = icmp4_reply.__class__(str(icmp4_reply))
- s = str(icmp4_reply)
+ 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=255, 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(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()
- self.validate_bytes(str(p[1]), icmp4_reply)
+ self.validate_bytes(bytes(p[1]), icmp4_reply)
+
+ self.assert_error_counter_equal("/err/ip4-input/mtu_exceeded", 11)
# 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
- p4_reply.ttl = 62 # check this
+ p4_reply.ttl = p_ip4.ttl - 1
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 = reassemble(rx)
+ 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)
self.pg0.add_stream(p4*1)
self.pg_start()
rx = self.pg1.get_capture(16)
- reass_pkt = reassemble(rx)
+ reass_pkt = reassemble4(rx)
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)
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=254, 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__(str(icmp6_reply))
- s = str(icmp6_reply)
- icmp6_reply = s[0:1280]
+ n = icmp6_reply.__class__(icmp6_reply)
+ s = bytes(icmp6_reply)
+ icmp6_reply_str = s[0:1280]
- rx = self.send_and_expect(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(str(p[1]), icmp6_reply)
+ self.validate_bytes(bytes(p[1]), icmp6_reply_str)
+
+ self.assert_error_counter_equal("/err/ip6-input/mtu_exceeded", 9)
# 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)
Code Review / vpp.git / blobdiff