fib tests: IP multicast over GRE

Type: feature

Change-Id: I1632ff23b1bf6d91aa3406c95ebd6ef0aa595f35
Signed-off-by: Neale Ranns <nranns@cisco.com>

3 files changed, 77 insertions, 1 deletions

diff --git a/src/vnet/adj/adj_midchain.c b/src/vnet/adj/adj_midchain.c
index dfe52c3c39f..542b5a13250 100644
--- a/src/vnet/adj/adj_midchain.c
+++ b/src/vnet/adj/adj_midchain.c
@@ -515,6 +515,7 @@ adj_nbr_midchain_update_rewrite (adj_index_t adj_index,
      */
     ASSERT((adj->lookup_next_index == IP_LOOKUP_NEXT_ARP) ||
            (adj->lookup_next_index == IP_LOOKUP_NEXT_GLEAN) ||
+           (adj->lookup_next_index == IP_LOOKUP_NEXT_MCAST) ||
            (adj->lookup_next_index == IP_LOOKUP_NEXT_BCAST));
 
     adj_midchain_setup(adj_index, fixup, fixup_data, flags);
diff --git a/test/test_ip_mcast.py b/test/test_ip_mcast.py
index b753f9a3354..d1f26d11325 100644
--- a/test/test_ip_mcast.py
+++ b/test/test_ip_mcast.py
@@ -6,9 +6,10 @@ from framework import VppTestCase, VppTestRunner
 from vpp_ip import DpoProto
 from vpp_ip_route import VppIpMRoute, VppMRoutePath, VppMFibSignal, \
     MRouteItfFlags, MRouteEntryFlags, VppIpTable, FibPathProto
+from vpp_gre_interface import VppGreInterface
 
 from scapy.packet import Raw
-from scapy.layers.l2 import Ether
+from scapy.layers.l2 import Ether, GRE
 from scapy.layers.inet import IP, UDP, getmacbyip
 from scapy.layers.inet6 import IPv6, getmacbyip6
 
@@ -795,6 +796,79 @@ class TestIPMcast(VppTestCase):
         self.verify_capture_ip4(self.pg1, tx)
         self.verify_capture_ip4(self.pg2, tx)
 
+    def test_ip_mcast_gre(self):
+        """ IP Multicast Replication over GRE"""
+
+        gre_if_1 = VppGreInterface(
+            self,
+            self.pg1.local_ip4,
+            self.pg1.remote_ip4).add_vpp_config()
+        gre_if_2 = VppGreInterface(
+            self,
+            self.pg2.local_ip4,
+            self.pg2.remote_ip4).add_vpp_config()
+        gre_if_3 = VppGreInterface(
+            self,
+            self.pg3.local_ip4,
+            self.pg3.remote_ip4).add_vpp_config()
+
+        gre_if_1.admin_up()
+        gre_if_1.config_ip4()
+        gre_if_2.admin_up()
+        gre_if_2.config_ip4()
+        gre_if_3.admin_up()
+        gre_if_3.config_ip4()
+
+        #
+        # An (S,G).
+        # one accepting interface, pg0, 2 forwarding interfaces
+        #
+        route_1_1_1_1_232_1_1_1 = VppIpMRoute(
+            self,
+            "1.1.1.1",
+            "232.2.2.2", 64,
+            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
+            [VppMRoutePath(gre_if_1.sw_if_index,
+                           MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
+             VppMRoutePath(gre_if_2.sw_if_index,
+                           MRouteItfFlags.MFIB_ITF_FLAG_FORWARD),
+             VppMRoutePath(gre_if_3.sw_if_index,
+                           MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
+        route_1_1_1_1_232_1_1_1.add_vpp_config()
+
+        #
+        # a stream that matches the route for (1.1.1.1,232.2.2.2)
+        #  small packets
+        #
+        tx = (Ether(dst=self.pg1.local_mac,
+                    src=self.pg1.remote_mac) /
+              IP(src=self.pg1.remote_ip4,
+                 dst=self.pg1.local_ip4) /
+              GRE() /
+              IP(src="1.1.1.1", dst="232.2.2.2") /
+              UDP(sport=1234, dport=1234) /
+              Raw('\a5' * 64)) * 63
+
+        self.vapi.cli("clear trace")
+        self.pg1.add_stream(tx)
+
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        # We expect replications on Pg2 & 3
+        # check the encap headers are as expected based on the egress tunnel
+        rxs = self.pg2.get_capture(len(tx))
+        for rx in rxs:
+            self.assertEqual(rx[IP].src, gre_if_2.t_src)
+            self.assertEqual(rx[IP].dst, gre_if_2.t_dst)
+            self.assert_packet_checksums_valid(rx)
+
+        rxs = self.pg3.get_capture(len(tx))
+        for rx in rxs:
+            self.assertEqual(rx[IP].src, gre_if_3.t_src)
+            self.assertEqual(rx[IP].dst, gre_if_3.t_dst)
+            self.assert_packet_checksums_valid(rx)
+
     def test_ip6_mcast_vrf(self):
         """ IPv6 Multicast Replication in non-default table"""
 
diff --git a/test/vpp_gre_interface.py b/test/vpp_gre_interface.py
index 818f429f5c9..fca2c1f86c8 100644
--- a/test/vpp_gre_interface.py
+++ b/test/vpp_gre_interface.py
@@ -31,6 +31,7 @@ class VppGreInterface(VppInterface):
         self.set_sw_if_index(r.sw_if_index)
         self.generate_remote_hosts()
         self.test.registry.register(self, self.test.logger)
+        return self
 
     def remove_vpp_config(self):
         self.unconfig()