make test: Loopback interface CRUD test

Change-Id: I0581da7a682bfe4dd6520ecf1b2ea6bd8c20b1b3
Signed-off-by: Matej Klotton <mklotton@cisco.com>

test/test_interface_crud.py

@@ -0,0 +1,151 @@
+#!/usr/bin/env python
+"""CRUD tests of APIs (Create, Read, Update, Delete) HLD:
+
+- interface up/down/add/delete - interface type:
+    - pg (TBD)
+    - loopback
+    - vhostuser (TBD)
+    - af_packet (TBD)
+    - netmap (TBD)
+    - tuntap (root privileges needed)
+    - vxlan (TBD)
+"""
+
+import unittest
+
+from scapy.layers.inet import IP, ICMP
+from scapy.layers.l2 import Ether
+
+from framework import VppTestCase, VppTestRunner
+
+
+class TestLoopbackInterfaceCRUD(VppTestCase):
+    """CRUD Loopback
+
+    """
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestLoopbackInterfaceCRUD, cls).setUpClass()
+        try:
+            cls.create_pg_interfaces(range(1))
+            for i in cls.pg_interfaces:
+                i.config_ip4()
+                i.resolve_arp()
+        except:
+            cls.tearDownClass()
+            raise
+
+    @staticmethod
+    def create_icmp_stream(src_if, dst_ifs):
+        """
+
+        :param VppInterface src_if: Packets are send to this interface,
+            using this interfaces remote host.
+        :param list dst_ifs: IPv4 ICMP requests are send to interfaces
+            addresses.
+        :return: List of generated packets.
+        """
+        pkts = []
+        for i in dst_ifs:
+            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+                 IP(src=src_if.remote_ip4, dst=i.local_ip4) /
+                 ICMP(id=i.sw_if_index, type='echo-request'))
+            pkts.append(p)
+        return pkts
+
+    def verify_icmp(self, capture, request_src_if, dst_ifs):
+        """
+
+        :param capture: Capture to verify.
+        :param VppInterface request_src_if: Interface where was send packets.
+        :param list dst_ifs: Interfaces where was generated IPv4 ICMP requests.
+        """
+        rcvd_icmp_pkts = []
+        for pkt in capture:
+            try:
+                ip = pkt[IP]
+                icmp = pkt[ICMP]
+            except IndexError:
+                pass
+            else:
+                info = (ip.src, ip.dst, icmp.type, icmp.id)
+                rcvd_icmp_pkts.append(info)
+
+        for i in dst_ifs:
+            # 0 - icmp echo response
+            info = (i.local_ip4, request_src_if.remote_ip4, 0, i.sw_if_index)
+            self.assertIn(info, rcvd_icmp_pkts)
+
+    def test_crud(self):
+        # create
+        loopbacks = self.create_loopback_interfaces(range(20))
+        for i in loopbacks:
+            i.local_ip4_prefix_len = 32
+            i.config_ip4()
+            i.admin_up()
+
+        # read (check sw if dump, ip4 fib, ip6 fib)
+        if_dump = self.vapi.sw_interface_dump()
+        fib4_dump = self.vapi.ip_fib_dump()
+        for i in loopbacks:
+            self.assertTrue(i.is_interface_config_in_dump(if_dump))
+            self.assertTrue(i.is_ip4_entry_in_fib_dump(fib4_dump))
+
+        # check ping
+        stream = self.create_icmp_stream(self.pg0, loopbacks)
+        self.pg0.add_stream(stream)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        capture = self.pg0.get_capture(expected_count=len(stream))
+
+        self.verify_icmp(capture, self.pg0, loopbacks)
+
+        # delete
+        for i in loopbacks:
+            i.remove_vpp_config()
+
+        # read (check not in sw if dump, ip4 fib, ip6 fib)
+        if_dump = self.vapi.sw_interface_dump()
+        fib4_dump = self.vapi.ip_fib_dump()
+        for i in loopbacks:
+            self.assertFalse(i.is_interface_config_in_dump(if_dump))
+            self.assertFalse(i.is_ip4_entry_in_fib_dump(fib4_dump))
+
+        #  check not ping
+        stream = self.create_icmp_stream(self.pg0, loopbacks)
+        self.pg0.add_stream(stream)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        self.pg0.assert_nothing_captured()
+
+    def test_down(self):
+        # create
+        loopbacks = self.create_loopback_interfaces(range(20))
+        for i in loopbacks:
+            i.local_ip4_prefix_len = 32
+            i.config_ip4()
+            i.admin_up()
+
+        # disable
+        for i in loopbacks:
+            i.admin_down()
+            i.unconfig_ip4()
+
+        # read (check not in sw if dump, ip4 fib, ip6 fib)
+        if_dump = self.vapi.sw_interface_dump()
+        fib4_dump = self.vapi.ip_fib_dump()
+        for i in loopbacks:
+            self.assertTrue(i.is_interface_config_in_dump(if_dump))
+            self.assertFalse(i.is_ip4_entry_in_fib_dump(fib4_dump))
+
+        #  check not ping
+        stream = self.create_icmp_stream(self.pg0, loopbacks)
+        self.pg0.add_stream(stream)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        self.pg0.assert_nothing_captured()
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)