IPSEC: tunnel fragmentation

Change-Id: I63741a22bc82f5f861e1c0f26a93b5569cc52061
Signed-off-by: Neale Ranns <nranns@cisco.com>

3 files changed, 52 insertions, 28 deletions

diff --git a/test/framework.py b/test/framework.py
index dce477d16d2..004d2f62f49 100644
--- a/test/framework.py
+++ b/test/framework.py
@@ -1017,9 +1017,11 @@ class VppTestCase(unittest.TestCase):
             i.assert_nothing_captured(remark=remark)
             timeout = 0.1
 
-    def send_and_expect(self, intf, pkts, output):
+    def send_and_expect(self, intf, pkts, output, n_rx=None):
+        if not n_rx:
+            n_rx = len(pkts)
         self.pg_send(intf, pkts)
-        rx = output.get_capture(len(pkts))
+        rx = output.get_capture(n_rx)
         return rx
 
     def send_and_expect_only(self, intf, pkts, output, timeout=None):
diff --git a/test/template_ipsec.py b/test/template_ipsec.py
index 40e787eebb7..333a6685b8e 100644
--- a/test/template_ipsec.py
+++ b/test/template_ipsec.py
@@ -7,7 +7,7 @@ from scapy.layers.l2 import Ether, Raw
 from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest
 
 from framework import VppTestCase, VppTestRunner
-from util import ppp
+from util import ppp, reassemble4
 from vpp_papi import VppEnum
 
 
@@ -161,8 +161,6 @@ class TemplateIpsec(VppTestCase):
         super(TemplateIpsec, self).setUp()
 
         self.setup_params()
-        self.payload = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"\
-                       "XXXXXXXXXXXXXXXXXXXXX"
 
         self.tun_spd_id = 1
         self.tra_spd_id = 2
@@ -193,26 +191,30 @@ class TemplateIpsec(VppTestCase):
         if not self.vpp_dead:
             self.vapi.cli("show hardware")
 
-    def gen_encrypt_pkts(self, sa, sw_intf, src, dst, count=1):
+    def gen_encrypt_pkts(self, sa, sw_intf, src, dst, count=1,
+                         payload_size=54):
         return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
-                sa.encrypt(IP(src=src, dst=dst) / ICMP() / self.payload)
+                sa.encrypt(IP(src=src, dst=dst) /
+                           ICMP() / Raw('X' * payload_size))
                 for i in range(count)]
 
-    def gen_encrypt_pkts6(self, sa, sw_intf, src, dst, count=1):
+    def gen_encrypt_pkts6(self, sa, sw_intf, src, dst, count=1,
+                          payload_size=54):
         return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                 sa.encrypt(IPv6(src=src, dst=dst) /
-                           ICMPv6EchoRequest(id=0, seq=1, data=self.payload))
+                           ICMPv6EchoRequest(id=0, seq=1,
+                                             data='X' * payload_size))
                 for i in range(count)]
 
-    def gen_pkts(self, sw_intf, src, dst, count=1):
+    def gen_pkts(self, sw_intf, src, dst, count=1, payload_size=54):
         return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
-                IP(src=src, dst=dst) / ICMP() / self.payload
+                IP(src=src, dst=dst) / ICMP() / Raw('X' * payload_size)
                 for i in range(count)]
 
-    def gen_pkts6(self, sw_intf, src, dst, count=1):
+    def gen_pkts6(self, sw_intf, src, dst, count=1, payload_size=54):
         return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                 IPv6(src=src, dst=dst) /
-                ICMPv6EchoRequest(id=0, seq=1, data=self.payload)
+                ICMPv6EchoRequest(id=0, seq=1, data='X' * payload_size)
                 for i in range(count)]
 
 
@@ -470,8 +472,10 @@ class IpsecTun4(object):
         self.assert_packet_counter_equal(self.tun4_encrypt_node_name, count)
         self.assert_packet_counter_equal(self.tun4_decrypt_node_name, count)
 
-    def verify_tun_44(self, p, count=1):
+    def verify_tun_44(self, p, count=1, payload_size=64, n_rx=None):
         self.vapi.cli("clear errors")
+        if not n_rx:
+            n_rx = count
         try:
             config_tun_params(p, self.encryption_type, self.tun_if)
             send_pkts = self.gen_encrypt_pkts(p.scapy_tun_sa, self.tun_if,
@@ -484,16 +488,19 @@ class IpsecTun4(object):
                 self.assert_equal(recv_pkt[IP].dst, self.pg1.remote_ip4)
                 self.assert_packet_checksums_valid(recv_pkt)
             send_pkts = self.gen_pkts(self.pg1, src=self.pg1.remote_ip4,
-                                      dst=p.remote_tun_if_host, count=count)
-            recv_pkts = self.send_and_expect(self.pg1, send_pkts, self.tun_if)
+                                      dst=p.remote_tun_if_host, count=count,
+                                      payload_size=payload_size)
+            recv_pkts = self.send_and_expect(self.pg1, send_pkts,
+                                             self.tun_if, n_rx)
+            decrypt_pkts = []
             for recv_pkt in recv_pkts:
                 try:
                     decrypt_pkt = p.vpp_tun_sa.decrypt(recv_pkt[IP])
                     if not decrypt_pkt.haslayer(IP):
                         decrypt_pkt = IP(decrypt_pkt[Raw].load)
+                    decrypt_pkts.append(decrypt_pkt)
                     self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip4)
                     self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host)
-                    self.assert_packet_checksums_valid(decrypt_pkt)
                 except:
                     self.logger.debug(ppp("Unexpected packet:", recv_pkt))
                     try:
@@ -502,6 +509,9 @@ class IpsecTun4(object):
                     except:
                         pass
                     raise
+            pkts = reassemble4(decrypt_pkts)
+            for pkt in pkts:
+                self.assert_packet_checksums_valid(pkt)
         finally:
             self.logger.info(self.vapi.ppcli("show error"))
             self.logger.info(self.vapi.ppcli("show ipsec"))
diff --git a/test/test_ipsec_tun_if_esp.py b/test/test_ipsec_tun_if_esp.py
index e9894a9f340..5af37bfac73 100644
--- a/test/test_ipsec_tun_if_esp.py
+++ b/test/test_ipsec_tun_if_esp.py
@@ -20,21 +20,22 @@ class TemplateIpsec4TunIfEsp(TemplateIpsec):
         self.tun_if = self.pg0
 
         p = self.ipv4_params
-        tun_if = VppIpsecTunInterface(self, self.pg0, p.vpp_tun_spi,
-                                      p.scapy_tun_spi, p.crypt_algo_vpp_id,
-                                      p.crypt_key, p.crypt_key,
-                                      p.auth_algo_vpp_id, p.auth_key,
-                                      p.auth_key)
-        tun_if.add_vpp_config()
-        tun_if.admin_up()
-        tun_if.config_ip4()
-        tun_if.config_ip6()
+
+        p.tun_if = VppIpsecTunInterface(self, self.pg0, p.vpp_tun_spi,
+                                        p.scapy_tun_spi, p.crypt_algo_vpp_id,
+                                        p.crypt_key, p.crypt_key,
+                                        p.auth_algo_vpp_id, p.auth_key,
+                                        p.auth_key)
+        p.tun_if.add_vpp_config()
+        p.tun_if.admin_up()
+        p.tun_if.config_ip4()
+        p.tun_if.config_ip6()
 
         VppIpRoute(self, p.remote_tun_if_host, 32,
-                   [VppRoutePath(tun_if.remote_ip4,
+                   [VppRoutePath(p.tun_if.remote_ip4,
                                  0xffffffff)]).add_vpp_config()
         VppIpRoute(self, p.remote_tun_if_host6, 128,
-                   [VppRoutePath(tun_if.remote_ip6,
+                   [VppRoutePath(p.tun_if.remote_ip6,
                                  0xffffffff,
                                  proto=DpoProto.DPO_PROTO_IP6)],
                    is_ip6=1).add_vpp_config()
@@ -58,6 +59,17 @@ class TestIpsec4TunIfEsp1(TemplateIpsec4TunIfEsp, IpsecTun4Tests):
         """ ipsec 6o4 tunnel basic test """
         self.verify_tun_64(self.params[socket.AF_INET], count=257)
 
+    def test_tun_basic_frag44(self):
+        """ ipsec 4o4 tunnel frag basic test """
+        p = self.ipv4_params
+
+        self.vapi.sw_interface_set_mtu(p.tun_if.sw_if_index,
+                                       [1500, 0, 0, 0])
+        self.verify_tun_44(self.params[socket.AF_INET],
+                           count=1, payload_size=1800, n_rx=2)
+        self.vapi.sw_interface_set_mtu(p.tun_if.sw_if_index,
+                                       [9000, 0, 0, 0])
+
 
 class TestIpsec4TunIfEsp2(TemplateIpsec4TunIfEsp, IpsecTcpTests):
     """ Ipsec ESP - TCP tests """