fix VPP-1312 Invalid UDP packet length in ipsec

Change-Id: Ibfd0a2e7010e6e74c32244c538f60e0713bea03f
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 22 insertions, 26 deletions

diff --git a/test/test_ipsec_nat.py b/test/test_ipsec_nat.py
index 6d9dc109add..9e0b9ea912e 100644
--- a/test/test_ipsec_nat.py
+++ b/test/test_ipsec_nat.py
@@ -11,13 +11,6 @@ from template_ipsec import TemplateIpsec
 
 class IPSecNATTestCase(TemplateIpsec):
     """ IPSec/NAT
-
-    TRANSPORT MODE:
-
-     ---   encrypt   ---
-    |pg2| <-------> |VPP|
-     ---   decrypt   ---
-
     TUNNEL MODE:
 
 
@@ -31,20 +24,21 @@ class IPSecNATTestCase(TemplateIpsec):
      ---            ---           ---
     """
 
+    tcp_port_in = 6303
+    tcp_port_out = 6303
+    udp_port_in = 6304
+    udp_port_out = 6304
+    icmp_id_in = 6305
+    icmp_id_out = 6305
+
     @classmethod
     def setUpClass(cls):
         super(IPSecNATTestCase, cls).setUpClass()
-        cls.tcp_port_in = 6303
-        cls.tcp_port_out = 6303
-        cls.udp_port_in = 6304
-        cls.udp_port_out = 6304
-        cls.icmp_id_in = 6305
-        cls.icmp_id_out = 6305
         cls.tun_if = cls.pg0
         cls.config_esp_tun()
         cls.logger.info(cls.vapi.ppcli("show ipsec"))
         client = socket.inet_pton(socket.AF_INET, cls.remote_tun_if_host)
-        cls.vapi.ip_add_del_route(client, 32, cls.pg0.remote_ip4n)
+        cls.vapi.ip_add_del_route(client, 32, cls.tun_if.remote_ip4n)
 
     def create_stream_plain(self, src_mac, dst_mac, src_ip, dst_ip):
         return [
@@ -113,18 +107,19 @@ class IPSecNATTestCase(TemplateIpsec):
     def verify_capture_encrypted(self, capture, sa):
         for packet in capture:
             try:
+                copy = packet.__class__(str(packet))
+                del copy[UDP].len
+                copy = packet.__class__(str(copy))
+                self.assert_equal(packet[UDP].len, copy[UDP].len,
+                                  "UDP header length")
+                self.assert_packet_checksums_valid(packet)
                 self.assertIn(ESP, packet[IP])
                 decrypt_pkt = sa.decrypt(packet[IP])
+                self.assert_packet_checksums_valid(decrypt_pkt)
                 self.assert_equal(decrypt_pkt[IP].src, self.pg1.remote_ip4,
                                   "encrypted packet source address")
                 self.assert_equal(decrypt_pkt[IP].dst, self.tun_if.remote_ip4,
                                   "encrypted packet destination address")
-                # if decrypt_pkt.haslayer(TCP):
-                #     self.tcp_port_out = decrypt_pkt[TCP].sport
-                # elif decrypt_pkt.haslayer(UDP):
-                #     self.udp_port_out = decrypt_pkt[UDP].sport
-                # else:
-                #     self.icmp_id_out = decrypt_pkt[ICMP].id
             except Exception:
                 self.logger.error(
                     ppp("Unexpected or invalid encrypted packet:", packet))
@@ -138,14 +133,16 @@ class IPSecNATTestCase(TemplateIpsec):
                                          cls.crypt_algo_vpp_id,
                                          cls.crypt_key, cls.vpp_esp_protocol,
                                          cls.pg1.remote_ip4n,
-                                         cls.tun_if.remote_ip4n)
+                                         cls.tun_if.remote_ip4n,
+                                         udp_encap=1)
         cls.vapi.ipsec_sad_add_del_entry(cls.vpp_tun_sa_id,
                                          cls.vpp_tun_spi,
                                          cls.auth_algo_vpp_id, cls.auth_key,
                                          cls.crypt_algo_vpp_id,
                                          cls.crypt_key, cls.vpp_esp_protocol,
                                          cls.tun_if.remote_ip4n,
-                                         cls.pg1.remote_ip4n)
+                                         cls.pg1.remote_ip4n,
+                                         udp_encap=1)
         cls.vapi.ipsec_spd_add_del(cls.tun_spd_id)
         cls.vapi.ipsec_interface_add_del_spd(cls.tun_spd_id,
                                              cls.tun_if.sw_if_index)
@@ -153,7 +150,7 @@ class IPSecNATTestCase(TemplateIpsec):
                                                      "0.0.0.0")
         l_stopaddr = r_stopaddr = socket.inet_pton(socket.AF_INET,
                                                    "255.255.255.255")
-        cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, cls.vpp_tun_sa_id,
+        cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, cls.scapy_tun_sa_id,
                                          l_startaddr, l_stopaddr, r_startaddr,
                                          r_stopaddr,
                                          protocol=socket.IPPROTO_ESP)
@@ -161,7 +158,7 @@ class IPSecNATTestCase(TemplateIpsec):
                                          l_startaddr, l_stopaddr, r_startaddr,
                                          r_stopaddr, is_outbound=0,
                                          protocol=socket.IPPROTO_ESP)
-        cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, cls.vpp_tun_sa_id,
+        cls.vapi.ipsec_spd_add_del_entry(cls.tun_spd_id, cls.scapy_tun_sa_id,
                                          l_startaddr, l_stopaddr, r_startaddr,
                                          r_stopaddr, remote_port_start=4500,
                                          remote_port_stop=4500,
@@ -184,8 +181,7 @@ class IPSecNATTestCase(TemplateIpsec):
 
     def test_ipsec_nat_tun(self):
         """ IPSec/NAT tunnel test case """
-        scapy_tun_sa = SecurityAssociation(ESP,
-                                           spi=self.scapy_tun_spi,
+        scapy_tun_sa = SecurityAssociation(ESP, spi=self.scapy_tun_spi,
                                            crypt_algo=self.crypt_algo,
                                            crypt_key=self.crypt_key,
                                            auth_algo=self.auth_algo,