Add GTP-U plugin. VPP-694

Basic GTP-U feature

Change-Id: I31226f890a92c5303ac06e112ed7820cae52d9bd
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>

2 files changed, 321 insertions, 0 deletions

diff --git a/test/test_gtpu.py b/test/test_gtpu.py
new file mode 100644
index 00000000..9411fffc
--- /dev/null
+++ b/test/test_gtpu.py
@@ -0,0 +1,289 @@
+#!/usr/bin/env python
+
+import socket
+from util import ip4n_range
+import unittest
+from framework import VppTestCase, VppTestRunner
+from template_bd import BridgeDomain
+
+from scapy.layers.l2 import Ether, Raw
+from scapy.layers.inet import IP, UDP
+from scapy.contrib.gtp import GTP_U_Header
+from scapy.utils import atol
+
+
+class TestGtpu(BridgeDomain, VppTestCase):
+    """ GTPU Test Case """
+
+    def __init__(self, *args):
+        BridgeDomain.__init__(self)
+        VppTestCase.__init__(self, *args)
+
+    def encapsulate(self, pkt, vni):
+        """
+        Encapsulate the original payload frame by adding GTPU header with its
+        UDP, IP and Ethernet fields
+        """
+        return (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
+                IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
+                UDP(sport=self.dport, dport=self.dport, chksum=0) /
+                GTP_U_Header(TEID=vni, gtp_type=self.gtp_type, length=150) /
+                pkt)
+
+    def encap_mcast(self, pkt, src_ip, src_mac, vni):
+        """
+        Encapsulate the original payload frame by adding GTPU header with its
+        UDP, IP and Ethernet fields
+        """
+        return (Ether(src=src_mac, dst=self.mcast_mac) /
+                IP(src=src_ip, dst=self.mcast_ip4) /
+                UDP(sport=self.dport, dport=self.dport, chksum=0) /
+                GTP_U_Header(TEID=vni, gtp_type=self.gtp_type, length=150) /
+                pkt)
+
+    def decapsulate(self, pkt):
+        """
+        Decapsulate the original payload frame by removing GTPU header
+        """
+        return pkt[GTP_U_Header].payload
+
+    # Method for checking GTPU encapsulation.
+    #
+    def check_encapsulation(self, pkt, vni, local_only=False, mcast_pkt=False):
+        # Verify source MAC is VPP_MAC and destination MAC is MY_MAC resolved
+        #  by VPP using ARP.
+        self.assertEqual(pkt[Ether].src, self.pg0.local_mac)
+        if not local_only:
+            if not mcast_pkt:
+                self.assertEqual(pkt[Ether].dst, self.pg0.remote_mac)
+            else:
+                self.assertEqual(pkt[Ether].dst, type(self).mcast_mac)
+        # Verify GTPU tunnel source IP is VPP_IP and destination IP is MY_IP.
+        self.assertEqual(pkt[IP].src, self.pg0.local_ip4)
+        if not local_only:
+            if not mcast_pkt:
+                self.assertEqual(pkt[IP].dst, self.pg0.remote_ip4)
+            else:
+                self.assertEqual(pkt[IP].dst, type(self).mcast_ip4)
+        # Verify UDP destination port is GTPU 2152, source UDP port could be
+        #  arbitrary.
+        self.assertEqual(pkt[UDP].dport, type(self).dport)
+        # Verify TEID
+        self.assertEqual(pkt[GTP_U_Header].TEID, vni)
+
+    def test_encap(self):
+        """ Encapsulation test
+        Send frames from pg1
+        Verify receipt of encapsulated frames on pg0
+        """
+        self.pg1.add_stream([self.frame_reply])
+
+        self.pg0.enable_capture()
+
+        self.pg_start()
+
+        # Pick first received frame and check if it's corectly encapsulated.
+        out = self.pg0.get_capture(1)
+        pkt = out[0]
+        self.check_encapsulation(pkt, self.single_tunnel_bd)
+
+        # payload = self.decapsulate(pkt)
+        # self.assert_eq_pkts(payload, self.frame_reply)
+
+    def test_ucast_flood(self):
+        """ Unicast flood test
+        Send frames from pg3
+        Verify receipt of encapsulated frames on pg0
+        """
+        self.pg3.add_stream([self.frame_reply])
+
+        self.pg0.enable_capture()
+
+        self.pg_start()
+
+        # Get packet from each tunnel and assert it's corectly encapsulated.
+        out = self.pg0.get_capture(self.n_ucast_tunnels)
+        for pkt in out:
+            self.check_encapsulation(pkt, self.ucast_flood_bd, True)
+            # payload = self.decapsulate(pkt)
+            # self.assert_eq_pkts(payload, self.frame_reply)
+
+    def test_mcast_flood(self):
+        """ Multicast flood test
+        Send frames from pg2
+        Verify receipt of encapsulated frames on pg0
+        """
+        self.pg2.add_stream([self.frame_reply])
+
+        self.pg0.enable_capture()
+
+        self.pg_start()
+
+        # Pick first received frame and check if it's corectly encapsulated.
+        out = self.pg0.get_capture(1)
+        pkt = out[0]
+        self.check_encapsulation(pkt, self.mcast_flood_bd,
+                                 local_only=False, mcast_pkt=True)
+
+        # payload = self.decapsulate(pkt)
+        # self.assert_eq_pkts(payload, self.frame_reply)
+
+    @classmethod
+    def create_gtpu_flood_test_bd(cls, teid, n_ucast_tunnels):
+        # Create 10 ucast gtpu tunnels under bd
+        ip_range_start = 10
+        ip_range_end = ip_range_start + n_ucast_tunnels
+        next_hop_address = cls.pg0.remote_ip4n
+        for dest_ip4n in ip4n_range(next_hop_address, ip_range_start,
+                                    ip_range_end):
+            # add host route so dest_ip4n will not be resolved
+            cls.vapi.ip_add_del_route(dest_ip4n, 32, next_hop_address)
+            r = cls.vapi.gtpu_add_del_tunnel(
+                src_addr=cls.pg0.local_ip4n,
+                dst_addr=dest_ip4n,
+                teid=teid)
+            cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index, bd_id=teid)
+
+    @classmethod
+    def add_del_shared_mcast_dst_load(cls, is_add):
+        """
+        add or del tunnels sharing the same mcast dst
+        to test gtpu ref_count mechanism
+        """
+        n_shared_dst_tunnels = 20
+        teid_start = 1000
+        teid_end = teid_start + n_shared_dst_tunnels
+        for teid in range(teid_start, teid_end):
+            r = cls.vapi.gtpu_add_del_tunnel(
+                src_addr=cls.pg0.local_ip4n,
+                dst_addr=cls.mcast_ip4n,
+                mcast_sw_if_index=1,
+                teid=teid,
+                is_add=is_add)
+            if r.sw_if_index == 0xffffffff:
+                raise "bad sw_if_index"
+
+    @classmethod
+    def add_shared_mcast_dst_load(cls):
+        cls.add_del_shared_mcast_dst_load(is_add=1)
+
+    @classmethod
+    def del_shared_mcast_dst_load(cls):
+        cls.add_del_shared_mcast_dst_load(is_add=0)
+
+    @classmethod
+    def add_del_mcast_tunnels_load(cls, is_add):
+        """
+        add or del tunnels to test gtpu stability
+        """
+        n_distinct_dst_tunnels = 20
+        ip_range_start = 10
+        ip_range_end = ip_range_start + n_distinct_dst_tunnels
+        for dest_ip4n in ip4n_range(cls.mcast_ip4n, ip_range_start,
+                                    ip_range_end):
+            teid = bytearray(dest_ip4n)[3]
+            cls.vapi.gtpu_add_del_tunnel(
+                src_addr=cls.pg0.local_ip4n,
+                dst_addr=dest_ip4n,
+                mcast_sw_if_index=1,
+                teid=teid,
+                is_add=is_add)
+
+    @classmethod
+    def add_mcast_tunnels_load(cls):
+        cls.add_del_mcast_tunnels_load(is_add=1)
+
+    @classmethod
+    def del_mcast_tunnels_load(cls):
+        cls.add_del_mcast_tunnels_load(is_add=0)
+
+    # Class method to start the GTPU test case.
+    #  Overrides setUpClass method in VppTestCase class.
+    #  Python try..except statement is used to ensure that the tear down of
+    #  the class will be executed even if exception is raised.
+    #  @param cls The class pointer.
+    @classmethod
+    def setUpClass(cls):
+        super(TestGtpu, cls).setUpClass()
+
+        try:
+            cls.dport = 2152
+            cls.gtp_type = 0xff
+
+            # Create 2 pg interfaces.
+            cls.create_pg_interfaces(range(4))
+            for pg in cls.pg_interfaces:
+                pg.admin_up()
+
+            # Configure IPv4 addresses on VPP pg0.
+            cls.pg0.config_ip4()
+
+            # Resolve MAC address for VPP's IP address on pg0.
+            cls.pg0.resolve_arp()
+
+            # Our Multicast address
+            cls.mcast_ip4 = '239.1.1.1'
+            cls.mcast_ip4n = socket.inet_pton(socket.AF_INET, cls.mcast_ip4)
+            iplong = atol(cls.mcast_ip4)
+            cls.mcast_mac = "01:00:5e:%02x:%02x:%02x" % (
+                (iplong >> 16) & 0x7F, (iplong >> 8) & 0xFF, iplong & 0xFF)
+
+            # Create GTPU VTEP on VPP pg0, and put gtpu_tunnel0 and pg1
+            #  into BD.
+            cls.single_tunnel_bd = 11
+            r = cls.vapi.gtpu_add_del_tunnel(
+                src_addr=cls.pg0.local_ip4n,
+                dst_addr=cls.pg0.remote_ip4n,
+                teid=cls.single_tunnel_bd)
+            cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index,
+                                                bd_id=cls.single_tunnel_bd)
+            cls.vapi.sw_interface_set_l2_bridge(cls.pg1.sw_if_index,
+                                                bd_id=cls.single_tunnel_bd)
+
+            # Setup teid 2 to test multicast flooding
+            cls.n_ucast_tunnels = 10
+            cls.mcast_flood_bd = 12
+            cls.create_gtpu_flood_test_bd(cls.mcast_flood_bd,
+                                          cls.n_ucast_tunnels)
+            r = cls.vapi.gtpu_add_del_tunnel(
+                src_addr=cls.pg0.local_ip4n,
+                dst_addr=cls.mcast_ip4n,
+                mcast_sw_if_index=1,
+                teid=cls.mcast_flood_bd)
+            cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index,
+                                                bd_id=cls.mcast_flood_bd)
+            cls.vapi.sw_interface_set_l2_bridge(cls.pg2.sw_if_index,
+                                                bd_id=cls.mcast_flood_bd)
+
+            # Add and delete mcast tunnels to check stability
+            cls.add_shared_mcast_dst_load()
+            cls.add_mcast_tunnels_load()
+            cls.del_shared_mcast_dst_load()
+            cls.del_mcast_tunnels_load()
+
+            # Setup teid 3 to test unicast flooding
+            cls.ucast_flood_bd = 13
+            cls.create_gtpu_flood_test_bd(cls.ucast_flood_bd,
+                                          cls.n_ucast_tunnels)
+            cls.vapi.sw_interface_set_l2_bridge(cls.pg3.sw_if_index,
+                                                bd_id=cls.ucast_flood_bd)
+        except Exception:
+            super(TestGtpu, cls).tearDownClass()
+            raise
+
+    # Method to define VPP actions before tear down of the test case.
+    #  Overrides tearDown method in VppTestCase class.
+    #  @param self The object pointer.
+    def tearDown(self):
+        super(TestGtpu, self).tearDown()
+        if not self.vpp_dead:
+            self.logger.info(self.vapi.cli("show bridge-domain 11 detail"))
+            self.logger.info(self.vapi.cli("show bridge-domain 12 detail"))
+            self.logger.info(self.vapi.cli("show bridge-domain 13 detail"))
+            self.logger.info(self.vapi.cli("show int"))
+            self.logger.info(self.vapi.cli("show gtpu tunnel"))
+            self.logger.info(self.vapi.cli("show trace"))
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)
diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index 83c4a83b..ff8e2cfd 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -1775,3 +1775,35 @@ class VppPapiProvider(object):
                 'is_translation': is_translation,
                 'mtu': mtu
             })
+
+    def gtpu_add_del_tunnel(
+            self,
+            src_addr,
+            dst_addr,
+            is_add=1,
+            is_ipv6=0,
+            mcast_sw_if_index=0xFFFFFFFF,
+            encap_vrf_id=0,
+            decap_next_index=0xFFFFFFFF,
+            teid=0):
+        """
+
+        :param is_add:  (Default value = 1)
+        :param is_ipv6:  (Default value = 0)
+        :param src_addr:
+        :param dst_addr:
+        :param mcast_sw_if_index:  (Default value = 0xFFFFFFFF)
+        :param encap_vrf_id:  (Default value = 0)
+        :param decap_next_index:  (Default value = 0xFFFFFFFF)
+        :param teid:  (Default value = 0)
+
+        """
+        return self.api(self.papi.gtpu_add_del_tunnel,
+                        {'is_add': is_add,
+                         'is_ipv6': is_ipv6,
+                         'src_address': src_addr,
+                         'dst_address': dst_addr,
+                         'mcast_sw_if_index': mcast_sw_if_index,
+                         'encap_vrf_id': encap_vrf_id,
+                         'decap_next_index': decap_next_index,
+                         'teid': teid})