IPv4/6 reassembly

Change-Id: Ic5dcadd13c88b8a5e7896dab82404509c081614a
Signed-off-by: Klement Sekera <ksekera@cisco.com>

test/vpp_punt_socket.py

@@ -0,0 +1,75 @@
+from socket import socket, AF_UNIX, SOCK_DGRAM
+from select import select
+from time import time
+from struct import unpack, calcsize
+from util import ppc
+from scapy.layers.l2 import Ether
+
+client_uds_socket_name = "client-uds-socket"
+vpp_uds_socket_name = "vpp-uds-socket"
+
+VPP_PUNT_HEADER_FMT = '=Ii'
+VPP_PUNT_HEADER_SIZE = calcsize(VPP_PUNT_HEADER_FMT)
+
+
+class VppPuntAction:
+    PUNT_L2 = 0
+    PUNT_IP4_ROUTED = 1
+    PUNT_IP6_ROUTED = 2
+
+
+class VppUDSPuntSocket(object):
+    def __init__(self, testcase, port, is_ip4=1, l4_protocol=0x11):
+        client_path = '%s/%s-%s-%s' % (testcase.tempdir,
+                                       client_uds_socket_name,
+                                       "4" if is_ip4 else "6", port)
+        testcase.vapi.punt_socket_register(
+            port, client_path, is_ip4=is_ip4, l4_protocol=l4_protocol)
+        self.testcase = testcase
+        self.uds = socket(AF_UNIX, SOCK_DGRAM)
+        self.uds.bind(client_path)
+        self.uds.connect(testcase.punt_socket_path)
+
+    def wait_for_packets(self, count, timeout=1):
+        packets = []
+        now = time()
+        deadline = now + timeout
+        while len(packets) < count and now < deadline:
+            r, w, e = select([self.uds], [], [self.uds], deadline - now)
+            if self.uds in r:
+                x = self.uds.recv(1024 * 1024)
+                sw_if_index, punt_action = unpack(
+                    VPP_PUNT_HEADER_FMT, x[:VPP_PUNT_HEADER_SIZE])
+                packets.append({'sw_if_index': sw_if_index,
+                                'punt_action': punt_action,
+                                'packet': x[VPP_PUNT_HEADER_SIZE:]})
+
+            if self.uds in e:
+                raise Exception("select() indicates error on UDS socket")
+            now = time()
+
+        if len(packets) != count:
+            raise Exception("Unexpected packet count received, got %s packets,"
+                            " expected %s packets" % (len(packets), count))
+        self.testcase.logger.debug(
+            "Got %s packets via punt socket" % len(packets))
+        return packets
+
+    def assert_nothing_captured(self, timeout=.25):
+        packets = []
+        now = time()
+        deadline = now + timeout
+        while now < deadline:
+            r, w, e = select([self.uds], [], [self.uds], deadline - now)
+            if self.uds in r:
+                x = self.uds.recv(1024 * 1024)
+                packets.append(Ether(x[VPP_PUNT_HEADER_SIZE:]))
+            if self.uds in e:
+                raise Exception("select() indicates error on UDS socket")
+            now = time()
+
+        if len(packets) > 0:
+            self.testcase.logger.error(
+                ppc("Unexpected packets captured:", packets))
+            raise Exception("Unexpected packet count received, got %s packets,"
+                            " expected no packets" % len(packets))