L3 cross connect

- all packets input on interface X are load-balanced over the set of
paths provided.

Change-Id: Ic27cb88c4cd5d6d3462570632daff7a43d5a652d
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/test/test_l3xc.py b/test/test_l3xc.py
new file mode 100644
index 00000000000..ceb95ce02dd
--- /dev/null
+++ b/test/test_l3xc.py
@@ -0,0 +1,174 @@
+#!/usr/bin/env python
+
+from socket import inet_pton, inet_ntop, AF_INET, AF_INET6
+import unittest
+
+from framework import VppTestCase, VppTestRunner
+from vpp_ip import DpoProto
+from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsLabel, VppIpTable
+
+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 vpp_object import VppObject
+
+NUM_PKTS = 67
+
+
+def find_l3xc(test, sw_if_index, dump_sw_if_index=None):
+    if not dump_sw_if_index:
+        dump_sw_if_index = sw_if_index
+    xcs = test.vapi.l3xc_dump(dump_sw_if_index)
+    for xc in xcs:
+        if sw_if_index == xc.l3xc.sw_if_index:
+            return True
+    return False
+
+
+class VppL3xc(VppObject):
+
+    def __init__(self,  test, intf, paths, is_ip6=False):
+        self._test = test
+        self.intf = intf
+        self.is_ip6 = is_ip6
+        self.paths = paths
+
+    def encode_paths(self):
+        br_paths = []
+        for p in self.paths:
+            lstack = []
+            for l in p.nh_labels:
+                if type(l) == VppMplsLabel:
+                    lstack.append(l.encode())
+                else:
+                    lstack.append({'label': l, 'ttl': 255})
+            n_labels = len(lstack)
+            while (len(lstack) < 16):
+                lstack.append({})
+            br_paths.append({'next_hop': p.nh_addr,
+                             'weight': 1,
+                             'afi': p.proto,
+                             'sw_if_index': p.nh_itf,
+                             'preference': 0,
+                             'table_id': p.nh_table_id,
+                             'next_hop_id': p.next_hop_id,
+                             'is_udp_encap': p.is_udp_encap,
+                             'n_labels': n_labels,
+                             'label_stack': lstack})
+        return br_paths
+
+    def add_vpp_config(self):
+        self._test.vapi.l3xc_update(
+            l3xc={
+                'is_ip6': self.is_ip6,
+                'sw_if_index': self.intf.sw_if_index,
+                'n_paths': len(self.paths),
+                'paths': self.encode_paths()
+            })
+        self._test.registry.register(self, self._test.logger)
+
+    def remove_vpp_config(self):
+        self._test.vapi.l3xc_del(
+            is_ip6=self.is_ip6,
+            sw_if_index=self.intf.sw_if_index)
+
+    def query_vpp_config(self):
+        return find_l3xc(self._test, self.intf.sw_if_index)
+
+    def object_id(self):
+        return ("l3xc-%d" % self.intf.sw_if_index)
+
+
+class TestL3xc(VppTestCase):
+    """ L3XC Test Case """
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestL3xc, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestL3xc, cls).tearDownClass()
+
+    def setUp(self):
+        super(TestL3xc, self).setUp()
+
+        self.create_pg_interfaces(range(6))
+
+        for i in self.pg_interfaces:
+            i.admin_up()
+            i.config_ip4()
+            i.resolve_arp()
+            i.config_ip6()
+            i.resolve_ndp()
+
+    def tearDown(self):
+        for i in self.pg_interfaces:
+            i.unconfig_ip4()
+            i.unconfig_ip6()
+            i.ip6_disable()
+            i.admin_down()
+        super(TestL3xc, self).tearDown()
+
+    def send_and_expect_load_balancing(self, input, pkts, outputs):
+        self.pg_send(input, pkts)
+        rxs = []
+        for oo in outputs:
+            rx = oo._get_capture(1)
+            self.assertNotEqual(0, len(rx))
+            for r in rx:
+                rxs.append(r)
+        return rxs
+
+    def test_l3xc4(self):
+        """ IPv4 X-Connect """
+
+        #
+        # x-connect pg0 to pg1 and pg2 to pg3->5
+        #
+        l3xc_1 = VppL3xc(self, self.pg0,
+                         [VppRoutePath(self.pg1.remote_ip4,
+                                       self.pg1.sw_if_index)])
+        l3xc_1.add_vpp_config()
+        l3xc_2 = VppL3xc(self, self.pg2,
+                         [VppRoutePath(self.pg3.remote_ip4,
+                                       self.pg3.sw_if_index),
+                          VppRoutePath(self.pg4.remote_ip4,
+                                       self.pg4.sw_if_index),
+                          VppRoutePath(self.pg5.remote_ip4,
+                                       self.pg5.sw_if_index)])
+        l3xc_2.add_vpp_config()
+
+        self.assertTrue(find_l3xc(self, self.pg2.sw_if_index, 0xffffffff))
+
+        self.logger.info(self.vapi.cli("sh l3xc"))
+
+        #
+        # fire in packets. If it's forwarded then the L3XC was successful,
+        # since default routing will drop it
+        #
+        p_1 = (Ether(src=self.pg0.remote_mac,
+                     dst=self.pg0.local_mac) /
+               IP(src="1.1.1.1", dst="1.1.1.2") /
+               UDP(sport=1234, dport=1234) /
+               Raw('\xa5' * 100))
+        # self.send_and_expect(self.pg0, p_1*NUM_PKTS, self.pg1)
+
+        p_2 = []
+        for ii in range(NUM_PKTS):
+            p_2.append(Ether(src=self.pg0.remote_mac,
+                             dst=self.pg0.local_mac) /
+                       IP(src="1.1.1.1", dst="1.1.1.2") /
+                       UDP(sport=1000 + ii, dport=1234) /
+                       Raw('\xa5' * 100))
+        self.send_and_expect_load_balancing(self.pg2, p_2,
+                                            [self.pg3, self.pg4, self.pg5])
+
+        l3xc_2.remove_vpp_config()
+        self.send_and_assert_no_replies(self.pg2, p_2)
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)