#!/usr/bin/env python
""" 6RD RFC5969 functional tests """

import unittest
from scapy.layers.inet import IP, UDP, Ether
from scapy.layers.inet6 import IPv6
from scapy.packet import Raw
from framework import VppTestCase, VppTestRunner
from vpp_ip_route import VppIpRoute, VppRoutePath, DpoProto
from socket import AF_INET, AF_INET6, inet_pton

""" Test6rd is a subclass of  VPPTestCase classes.

6RD tests.

"""


class Test6RD(VppTestCase):
    """ 6RD Test Case """

    @classmethod
    def setUpClass(cls):
        super(Test6RD, cls).setUpClass()
        cls.create_pg_interfaces(range(2))
        cls.interfaces = list(cls.pg_interfaces)

    def setUp(cls):
        super(Test6RD, cls).setUp()
        for i in cls.interfaces:
            i.admin_up()
            i.config_ip4()
            i.config_ip6()
            i.disable_ipv6_ra()
            i.resolve_arp()
            i.resolve_ndp()

    def tearDown(self):
        super(Test6RD, self).tearDown()
        if not self.vpp_dead:
            for i in self.pg_interfaces:
                i.unconfig_ip4()
                i.unconfig_ip6()
                i.admin_down()
            if type(self.tunnel_index) is list:
                for sw_if_index in self.tunnel_index:
                    self.vapi.ipip_6rd_del_tunnel(sw_if_index)
            else:
                self.vapi.ipip_6rd_del_tunnel(self.tunnel_index)

    def validate_6in4(self, rx, expected):
        if IP not in rx:
            self.fail()
        if IPv6 not in rx:
            self.fail()

        self.assertEqual(rx[IP].src, expected[IP].src)
        self.assertEqual(rx[IP].dst, expected[IP].dst)
        self.assertEqual(rx[IP].proto, expected[IP].proto)
        self.assertEqual(rx[IPv6].src, expected[IPv6].src)
        self.assertEqual(rx[IPv6].dst, expected[IPv6].dst)

    def validate_4in6(self, rx, expected):
        if IPv6 not in rx:
            self.fail()
        if IP in rx:
            self.fail()

        self.assertTrue(rx[IPv6].src == expected[IPv6].src)
        self.assertTrue(rx[IPv6].dst == expected[IPv6].dst)
        self.assertTrue(rx[IPv6].nh == expected[IPv6].nh)

    def payload(self, len):
        return 'x' * len

    def test_6rd_ip6_to_ip4(self):
        """ ip6 -> ip4 (encap) 6rd test """
        p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
        p_ip6 = IPv6(src="1::1", dst="2002:AC10:0202::1", nh='UDP')

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'), 16,
            inet_pton(AF_INET, '0.0.0.0'), 0,
            self.pg0.local_ip4n, True)
        self.tunnel_index = rv.sw_if_index

        self.vapi.cli("show ip6 fib")
        p_payload = UDP(sport=1234, dport=1234)
        p = (p_ether / p_ip6 / p_payload)

        p_reply = (IP(src=self.pg0.local_ip4, dst=self.pg1.remote_ip4,
                      proto='ipv6') / p_ip6)

        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_6in4(p, p_reply)

        # MTU tests (default is 1480)
        plen = 1481 - 40 - 8
        p_ip6 = IPv6(src="1::1", dst="2002:AC10:0202::1")
        p_payload = UDP(sport=1234, dport=1234) / Raw(self.payload(plen))
        p = (p_ether / p_ip6 / p_payload)

        p_reply = (IP(src=self.pg0.local_ip4, dst=self.pg1.remote_ip4,
                      proto='ipv6') / p_ip6)

        rx = self.send_and_assert_no_replies(self.pg0, p*10)

    def test_6rd_ip4_to_ip6(self):
        """ ip4 -> ip6 (decap) 6rd test """

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg0.local_ip4n, True)
        self.tunnel_index = rv.sw_if_index
        rv = self.vapi.ipip_6rd_del_tunnel(rv.sw_if_index)
        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg0.local_ip4n, True)
        self.tunnel_index = rv.sw_if_index

        p_ip6 = (IPv6(src="2002:AC10:0202::1", dst=self.pg1.remote_ip6) /
                 UDP(sport=1234, dport=1234))

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IP(src=self.pg1.remote_ip4, dst=self.pg0.local_ip4) /
             p_ip6)

        p_reply = p_ip6

        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_reply)

    def test_6rd_ip4_to_ip6_multiple(self):
        """ ip4 -> ip6 (decap) 6rd test """

        self.tunnel_index = []
        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg0.local_ip4n, True)
        self.tunnel_index.append(rv.sw_if_index)

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2003::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg1.local_ip4n, True)
        self.tunnel_index.append(rv.sw_if_index)

        self.vapi.cli("show ip6 fib")
        p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
        p_ip4 = IP(src=self.pg1.remote_ip4, dst=self.pg0.local_ip4)
        p_ip6_1 = (IPv6(src="2002:AC10:0202::1", dst=self.pg1.remote_ip6) /
                   UDP(sport=1234, dport=1234))
        p_ip6_2 = (IPv6(src="2003:AC10:0202::1", dst=self.pg1.remote_ip6) /
                   UDP(sport=1234, dport=1234))

        p = (p_ether / p_ip4 / p_ip6_1)
        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_ip6_1)

        p = (p_ether / p_ip4 / p_ip6_2)
        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_ip6_2)

    def test_6rd_ip4_to_ip6_suffix(self):
        """ ip4 -> ip6 (decap) 6rd test """

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'), 16,
            inet_pton(AF_INET, '172.0.0.0'), 8,
            self.pg0.local_ip4n, True)

        self.tunnel_index = rv.sw_if_index

        self.vapi.cli("show ip6 fib")
        p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
        p_ip4 = IP(src=self.pg1.remote_ip4, dst=self.pg0.local_ip4)
        p_ip6 = (IPv6(src="2002:1002:0200::1", dst=self.pg1.remote_ip6) /
                 UDP(sport=1234, dport=1234))

        p = (p_ether / p_ip4 / p_ip6)
        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_ip6)

    def test_6rd_ip4_to_ip6_sec_check(self):
        """ ip4 -> ip6 (decap) security check 6rd test """

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg0.local_ip4n, True)
        self.tunnel_index = rv.sw_if_index

        self.vapi.cli("show ip6 fib")
        p_ip6 = (IPv6(src="2002:AC10:0202::1", dst=self.pg1.remote_ip6) /
                 UDP(sport=1234, dport=1234))
        p_ip6_fail = (IPv6(src="2002:DEAD:0202::1", dst=self.pg1.remote_ip6) /
                      UDP(sport=1234, dport=1234))

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IP(src=self.pg1.remote_ip4, dst=self.pg0.local_ip4) /
             p_ip6)

        p_reply = p_ip6

        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_reply)

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IP(src=self.pg1.remote_ip4, dst=self.pg0.local_ip4) /
             p_ip6_fail)
        rx = self.send_and_assert_no_replies(self.pg0, p*10)

    def test_6rd_bgp_tunnel(self):
        """ 6rd BGP tunnel """

        rv = self.vapi.ipip_6rd_add_tunnel(
            0, inet_pton(AF_INET6, '2002::'),
            16, inet_pton(AF_INET, '0.0.0.0'),
            0, self.pg0.local_ip4n, False)
        self.tunnel_index = rv.sw_if_index

        default_route = VppIpRoute(
            self, "DEAD::", 16, [VppRoutePath("2002:0808:0808::",
                                              self.tunnel_index,
                                              proto=DpoProto.DPO_PROTO_IP6)],
            is_ip6=1)
        default_route.add_vpp_config()

        ip4_route = VppIpRoute(self, "8.0.0.0", 8,
                               [VppRoutePath(self.pg1.remote_ip4, 0xFFFFFFFF)])
        ip4_route.add_vpp_config()

        # Via recursive route 6 -> 4
        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IPv6(src="1::1", dst="DEAD:BEEF::1") /
             UDP(sport=1234, dport=1234))

        p_reply = (IP(src=self.pg0.local_ip4, dst="8.8.8.8",
                      proto='ipv6') /
                   IPv6(src='1::1', dst='DEAD:BEEF::1', nh='UDP'))

        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_6in4(p, p_reply)

        # Via recursive route 4 -> 6 (Security check must be disabled)
        p_ip6 = (IPv6(src="DEAD:BEEF::1", dst=self.pg1.remote_ip6) /
                 UDP(sport=1234, dport=1234))
        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IP(src="8.8.8.8", dst=self.pg0.local_ip4) /
             p_ip6)

        p_reply = p_ip6

        rx = self.send_and_expect(self.pg0, p*10, self.pg1)
        for p in rx:
            self.validate_4in6(p, p_reply)


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