#!/usr/bin/env python

from framework import VppTestCase, VppTestRunner
from vpp_udp_encap import *
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable

from scapy.packet import Raw
from scapy.layers.l2 import Ether, ARP
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from scapy.contrib.mpls import MPLS


class TestUdpEncap(VppTestCase):
    """ UDP Encap Test Case """

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

        # create 2 pg interfaces
        self.create_pg_interfaces(range(4))

        # setup interfaces
        # assign them different tables.
        table_id = 0
        self.tables = []

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

            if table_id != 0:
                tbl = VppIpTable(self, table_id)
                tbl.add_vpp_config()
                self.tables.append(tbl)
                tbl = VppIpTable(self, table_id, is_ip6=1)
                tbl.add_vpp_config()
                self.tables.append(tbl)

            i.set_table_ip4(table_id)
            i.set_table_ip6(table_id)
            i.config_ip4()
            i.resolve_arp()
            i.config_ip6()
            i.resolve_ndp()
            table_id += 1

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.unconfig_ip6()
            i.ip6_disable()
            i.set_table_ip4(0)
            i.set_table_ip6(0)
            i.admin_down()
        super(TestUdpEncap, self).tearDown()

    def validate_outer4(self, rx, encap_obj):
        self.assertEqual(rx[IP].src, encap_obj.src_ip_s)
        self.assertEqual(rx[IP].dst, encap_obj.dst_ip_s)
        self.assertEqual(rx[UDP].sport, encap_obj.src_port)
        self.assertEqual(rx[UDP].dport, encap_obj.dst_port)

    def validate_outer6(self, rx, encap_obj):
        self.assertEqual(rx[IPv6].src, encap_obj.src_ip_s)
        self.assertEqual(rx[IPv6].dst, encap_obj.dst_ip_s)
        self.assertEqual(rx[UDP].sport, encap_obj.src_port)
        self.assertEqual(rx[UDP].dport, encap_obj.dst_port)

    def validate_inner4(self, rx, tx, ttl=None):
        self.assertEqual(rx.src, tx[IP].src)
        self.assertEqual(rx.dst, tx[IP].dst)
        if ttl:
            self.assertEqual(rx.ttl, ttl)
        else:
            self.assertEqual(rx.ttl, tx[IP].ttl)

    def validate_inner6(self, rx, tx):
        self.assertEqual(rx.src, tx[IPv6].src)
        self.assertEqual(rx.dst, tx[IPv6].dst)
        self.assertEqual(rx.hlim, tx[IPv6].hlim)

    def send_and_expect(self, input, output, pkts):
        self.vapi.cli("clear trace")
        input.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = output.get_capture(len(pkts))
        return rx

    def test_udp_encap(self):
        """ UDP Encap test
        """

        #
        # construct a UDP encap object through each of the peers
        # v4 through the first two peears, v6 through the second.
        #
        udp_encap_0 = VppUdpEncap(self, 0,
                                  self.pg0.local_ip4,
                                  self.pg0.remote_ip4,
                                  330, 440)
        udp_encap_1 = VppUdpEncap(self, 1,
                                  self.pg1.local_ip4,
                                  self.pg1.remote_ip4,
                                  331, 441,
                                  table_id=1)
        udp_encap_2 = VppUdpEncap(self, 2,
                                  self.pg2.local_ip6,
                                  self.pg2.remote_ip6,
                                  332, 442,
                                  table_id=2,
                                  is_ip6=1)
        udp_encap_3 = VppUdpEncap(self, 3,
                                  self.pg3.local_ip6,
                                  self.pg3.remote_ip6,
                                  333, 443,
                                  table_id=3,
                                  is_ip6=1)
        udp_encap_0.add_vpp_config()
        udp_encap_1.add_vpp_config()
        udp_encap_2.add_vpp_config()
        udp_encap_3.add_vpp_config()

        #
        # Routes via each UDP encap object - all combinations of v4 and v6.
        #
        route_4o4 = VppIpRoute(self, "1.1.0.1", 32,
                               [VppRoutePath("0.0.0.0",
                                             0xFFFFFFFF,
                                             is_udp_encap=1,
                                             next_hop_id=0)])
        route_4o6 = VppIpRoute(self, "1.1.2.1", 32,
                               [VppRoutePath("0.0.0.0",
                                             0xFFFFFFFF,
                                             is_udp_encap=1,
                                             next_hop_id=2)])
        route_6o4 = VppIpRoute(self, "2001::1", 128,
                               [VppRoutePath("0.0.0.0",
                                             0xFFFFFFFF,
                                             is_udp_encap=1,
                                             next_hop_id=1)],
                               is_ip6=1)
        route_6o6 = VppIpRoute(self, "2001::3", 128,
                               [VppRoutePath("0.0.0.0",
                                             0xFFFFFFFF,
                                             is_udp_encap=1,
                                             next_hop_id=3)],
                               is_ip6=1)
        route_4o4.add_vpp_config()
        route_4o6.add_vpp_config()
        route_6o6.add_vpp_config()
        route_6o4.add_vpp_config()

        #
        # 4o4 encap
        #
        p_4o4 = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="2.2.2.2", dst="1.1.0.1") /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        rx = self.send_and_expect(self.pg0, self.pg0, p_4o4*65)
        for p in rx:
            self.validate_outer4(p, udp_encap_0)
            p = IP(p["UDP"].payload.load)
            self.validate_inner4(p, p_4o4)

        #
        # 4o6 encap
        #
        p_4o6 = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="2.2.2.2", dst="1.1.2.1") /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        rx = self.send_and_expect(self.pg0, self.pg2, p_4o6*65)
        for p in rx:
            self.validate_outer6(p, udp_encap_2)
            p = IP(p["UDP"].payload.load)
            self.validate_inner4(p, p_4o6)

        #
        # 6o4 encap
        #
        p_6o4 = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IPv6(src="2001::100", dst="2001::1") /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        rx = self.send_and_expect(self.pg0, self.pg1, p_6o4*65)
        for p in rx:
            self.validate_outer4(p, udp_encap_1)
            p = IPv6(p["UDP"].payload.load)
            self.validate_inner6(p, p_6o4)

        #
        # 6o6 encap
        #
        p_6o6 = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IPv6(src="2001::100", dst="2001::3") /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        rx = self.send_and_expect(self.pg0, self.pg3, p_6o6*65)
        for p in rx:
            self.validate_outer6(p, udp_encap_3)
            p = IPv6(p["UDP"].payload.load)
            self.validate_inner6(p, p_6o6)

        #
        # A route with an output label
        # the TTL of the inner packet is decremented on LSP ingress
        #
        route_4oMPLSo4 = VppIpRoute(self, "1.1.2.22", 32,
                                    [VppRoutePath("0.0.0.0",
                                                  0xFFFFFFFF,
                                                  is_udp_encap=1,
                                                  next_hop_id=1,
                                                  labels=[66])])
        route_4oMPLSo4.add_vpp_config()

        p_4omo4 = (Ether(src=self.pg0.remote_mac,
                         dst=self.pg0.local_mac) /
                   IP(src="2.2.2.2", dst="1.1.2.22") /
                   UDP(sport=1234, dport=1234) /
                   Raw('\xa5' * 100))
        rx = self.send_and_expect(self.pg0, self.pg1, p_4omo4*65)
        for p in rx:
            self.validate_outer4(p, udp_encap_1)
            p = MPLS(p["UDP"].payload.load)
            self.validate_inner4(p, p_4omo4, ttl=63)


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