VPP-669: ping: fix coverity check error 165075 + add ping testcase

Fix the bug and add the unit test to start with ping test coverage

Change-Id: Ibeacbed1f1660e677faa2dbb2ebe386216693e96
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

src/vnet/ip/ping.c

@@ -835,7 +835,7 @@ ping_ip_address (vlib_main_t * vm,
 
   run_ping_ip46_address (vm, table_id, ping_ip4 ? &a4 : NULL,
 			 ping_ip6 ? &a6 : NULL, sw_if_index, ping_interval,
-			 ping_repeat, ping_burst, data_len, verbose);
+			 ping_repeat, data_len, ping_burst, verbose);
 done:
   return error;
 }

test/test_ping.py

@@ -0,0 +1,118 @@
+import socket
+
+from scapy.layers.inet import IP, UDP, ICMP
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether, GRE
+from scapy.packet import Raw
+
+from framework import VppTestCase
+from util import ppp
+
+""" TestPing is a subclass of  VPPTestCase classes.
+
+Basic test for sanity check of the ping.
+
+"""
+
+
+class TestPing(VppTestCase):
+    """ Ping Test Case """
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestPing, cls).setUpClass()
+        try:
+            cls.create_pg_interfaces(range(2))
+            cls.interfaces = list(cls.pg_interfaces)
+
+            for i in cls.interfaces:
+                i.admin_up()
+                i.config_ip4()
+                i.config_ip6()
+                i.disable_ipv6_ra()
+                i.resolve_arp()
+                i.resolve_ndp()
+        except Exception:
+            super(TestPing, cls).tearDownClass()
+            raise
+
+    def tearDown(self):
+        super(TestPing, self).tearDown()
+        if not self.vpp_dead:
+            self.vapi.cli("show hardware")
+
+    def test_ping_basic(self):
+        """ basic ping test """
+        try:
+            self.pg_enable_capture(self.pg_interfaces)
+            self.pg_start()
+            self.logger.info(self.vapi.cli("show ip arp"))
+            self.logger.info(self.vapi.cli("show ip6 neighbors"))
+
+            remote_ip4 = self.pg1.remote_ip4
+            ping_cmd = "ping " + remote_ip4 + " interval 0.01 repeat 10"
+            ret = self.vapi.cli(ping_cmd)
+            self.logger.info(ret)
+            out = self.pg1.get_capture(10)
+            icmp_id = None
+            icmp_seq = 1
+            for p in out:
+                ip = p[IP]
+                self.assertEqual(ip.version, 4)
+                self.assertEqual(ip.flags, 0)
+                self.assertEqual(ip.src, self.pg1.local_ip4)
+                self.assertEqual(ip.dst, self.pg1.remote_ip4)
+                self.assertEqual(ip.proto, 1)
+                self.assertEqual(len(ip.options), 0)
+                self.assertGreaterEqual(ip.ttl, 254)
+                icmp = p[ICMP]
+                self.assertEqual(icmp.type, 8)
+                self.assertEqual(icmp.code, 0)
+                self.assertEqual(icmp.seq, icmp_seq)
+                icmp_seq = icmp_seq + 1
+                if icmp_id is None:
+                    icmp_id = icmp.id
+                else:
+                    self.assertEqual(icmp.id, icmp_id)
+        finally:
+            self.vapi.cli("show error")
+
+    def test_ping_burst(self):
+        """ burst ping test """
+        try:
+            self.pg_enable_capture(self.pg_interfaces)
+            self.pg_start()
+            self.logger.info(self.vapi.cli("show ip arp"))
+            self.logger.info(self.vapi.cli("show ip6 neighbors"))
+
+            remote_ip4 = self.pg1.remote_ip4
+            ping_cmd = "ping " + remote_ip4 + " interval 0.01 burst 3"
+            ret = self.vapi.cli(ping_cmd)
+            self.logger.info(ret)
+            out = self.pg1.get_capture(3*5)
+            icmp_id = None
+            icmp_seq = 1
+            count = 0
+            for p in out:
+                ip = p[IP]
+                self.assertEqual(ip.version, 4)
+                self.assertEqual(ip.flags, 0)
+                self.assertEqual(ip.src, self.pg1.local_ip4)
+                self.assertEqual(ip.dst, self.pg1.remote_ip4)
+                self.assertEqual(ip.proto, 1)
+                self.assertEqual(len(ip.options), 0)
+                self.assertGreaterEqual(ip.ttl, 254)
+                icmp = p[ICMP]
+                self.assertEqual(icmp.type, 8)
+                self.assertEqual(icmp.code, 0)
+                self.assertEqual(icmp.seq, icmp_seq)
+                count = count + 1
+                if count >= 3:
+                    icmp_seq = icmp_seq + 1
+                    count = 0
+                if icmp_id is None:
+                    icmp_id = icmp.id
+                else:
+                    self.assertEqual(icmp.id, icmp_id)
+        finally:
+            self.vapi.cli("show error")