#!/usr/bin/env python3

import unittest

import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6

from framework import VppTestCase, VppTestRunner


class TestPgTun(VppTestCase):
    """ PG Test Case """

    def setUp(self):
        super(TestPgTun, self).setUp()

        # create 3 pg interfaces - one each ethernet, ip4-tun, ip6-tun.
        self.create_pg_interfaces(range(0, 1))
        self.pg_interfaces += self.create_pg_ip4_interfaces(range(1, 2))
        self.pg_interfaces += self.create_pg_ip6_interfaces(range(2, 3))

        for i in self.pg_interfaces:
            i.admin_up()

        for i in [self.pg0, self.pg1]:
            i.config_ip4()

        for i in [self.pg0, self.pg2]:
            i.config_ip6()

        self.pg0.resolve_arp()
        self.pg0.resolve_ndp()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.admin_down()
        super(TestPgTun, self).tearDown()

    def test_pg_tun(self):
        """ IP[46] Tunnel Mode PG """

        #
        # test that we can send and receive IP encap'd packets on the
        # tun interfaces
        #
        N_PKTS = 31

        # v4 tun to ethernet
        p = (IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
             UDP(sport=1234, dport=1234) /
             Raw('0' * 48))

        rxs = self.send_and_expect(self.pg1, p * N_PKTS, self.pg0)
        for rx in rxs:
            self.assertEqual(rx[Ether].dst, self.pg0.remote_mac)
            self.assertEqual(rx[IP].dst, self.pg0.remote_ip4)

        # v6 tun to ethernet
        p = (IPv6(src=self.pg2.remote_ip6, dst=self.pg0.remote_ip6) /
             UDP(sport=1234, dport=1234) /
             Raw('0' * 48))

        rxs = self.send_and_expect(self.pg2, p * N_PKTS, self.pg0)
        for rx in rxs:
            self.assertEqual(rx[Ether].dst, self.pg0.remote_mac)
            self.assertEqual(rx[IPv6].dst, self.pg0.remote_ip6)

        # eth to v4 tun
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
             UDP(sport=1234, dport=1234) /
             Raw('0' * 48))

        rxs = self.send_and_expect(self.pg0, p * N_PKTS, self.pg1)
        for rx in rxs:
            rx = IP(rx)
            self.assertFalse(rx.haslayer(Ether))
            self.assertEqual(rx[IP].dst, self.pg1.remote_ip4)

        # eth to v6 tun
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IPv6(src=self.pg0.remote_ip6, dst=self.pg2.remote_ip6) /
             UDP(sport=1234, dport=1234) /
             Raw('0' * 48))

        rxs = self.send_and_expect(self.pg0, p * N_PKTS, self.pg2)
        for rx in rxs:
            rx = IPv6(rx)
            self.assertFalse(rx.haslayer(Ether))
            self.assertEqual(rx[IPv6].dst, self.pg2.remote_ip6)


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)