punt and drop features:

- new IPv4 and IPv6 feature arcs on the punt and drop nodes
 - new features:
   - redirect punted traffic to an interface and nexthop
   - police punted traffic.

Change-Id: I53be8bf4e06545add8a3619e462de5ffedd0a95c
Signed-off-by: Neale Ranns <nranns@cisco.com>

test/test_ip6.py

@@ -13,7 +13,7 @@ from vpp_neighbor import find_nbr, VppNeighbor
 
 from scapy.packet import Raw
 from scapy.layers.l2 import Ether, Dot1Q
-from scapy.layers.inet6 import IPv6, UDP, ICMPv6ND_NS, ICMPv6ND_RS, \
+from scapy.layers.inet6 import IPv6, UDP, TCP, ICMPv6ND_NS, ICMPv6ND_RS, \
     ICMPv6ND_RA, ICMPv6NDOptSrcLLAddr, getmacbyip6, ICMPv6MRD_Solicitation, \
     ICMPv6NDOptMTU, ICMPv6NDOptSrcLLAddr, ICMPv6NDOptPrefixInfo, \
     ICMPv6ND_NA, ICMPv6NDOptDstLLAddr, ICMPv6DestUnreach, icmp6types
@@ -1506,5 +1506,117 @@ class TestIP6LoadBalance(VppTestCase):
         self.send_and_expect_one_itf(self.pg0, port_pkts, self.pg3)
 
 
+class TestIP6Punt(VppTestCase):
+    """ IPv6 Punt Police/Redirect """
+
+    def setUp(self):
+        super(TestIP6Punt, self).setUp()
+
+        self.create_pg_interfaces(range(2))
+
+        for i in self.pg_interfaces:
+            i.admin_up()
+            i.config_ip6()
+            i.resolve_ndp()
+
+    def tearDown(self):
+        super(TestIP6Punt, self).tearDown()
+        for i in self.pg_interfaces:
+            i.unconfig_ip6()
+            i.admin_down()
+
+    def send_and_expect(self, input, pkts, output):
+        input.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        rx = output.get_capture(len(pkts))
+        return rx
+
+    def send_and_assert_no_replies(self, intf, pkts, remark):
+        self.vapi.cli("clear trace")
+        intf.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        for i in self.pg_interfaces:
+            i.get_capture(0)
+            i.assert_nothing_captured(remark=remark)
+
+    def test_ip_punt(self):
+        """ IP6 punt police and redirect """
+
+        p = (Ether(src=self.pg0.remote_mac,
+                   dst=self.pg0.local_mac) /
+             IPv6(src=self.pg0.remote_ip6, dst=self.pg0.local_ip6) /
+             TCP(sport=1234, dport=1234) /
+             Raw('\xa5' * 100))
+
+        pkts = p * 1025
+
+        #
+        # Configure a punt redirect via pg1.
+        #
+        nh_addr = inet_pton(AF_INET6,
+                            self.pg1.remote_ip6)
+        self.vapi.ip_punt_redirect(self.pg0.sw_if_index,
+                                   self.pg1.sw_if_index,
+                                   nh_addr,
+                                   is_ip6=1)
+
+        self.send_and_expect(self.pg0, pkts, self.pg1)
+
+        #
+        # add a policer
+        #
+        policer = self.vapi.policer_add_del("ip6-punt", 400, 0, 10, 0,
+                                            rate_type=1)
+        self.vapi.ip_punt_police(policer.policer_index, is_ip6=1)
+
+        self.vapi.cli("clear trace")
+        self.pg0.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        #
+        # the number of packet recieved should be greater than 0,
+        # but not equal to the number sent, since some were policed
+        #
+        rx = self.pg1._get_capture(1)
+        self.assertTrue(len(rx) > 0)
+        self.assertTrue(len(rx) < len(pkts))
+
+        #
+        # remove the poilcer. back to full rx
+        #
+        self.vapi.ip_punt_police(policer.policer_index, is_add=0, is_ip6=1)
+        self.vapi.policer_add_del("ip6-punt", 400, 0, 10, 0,
+                                  rate_type=1, is_add=0)
+        self.send_and_expect(self.pg0, pkts, self.pg1)
+
+        #
+        # remove the redirect. expect full drop.
+        #
+        self.vapi.ip_punt_redirect(self.pg0.sw_if_index,
+                                   self.pg1.sw_if_index,
+                                   nh_addr,
+                                   is_add=0,
+                                   is_ip6=1)
+        self.send_and_assert_no_replies(self.pg0, pkts,
+                                        "IP no punt config")
+
+        #
+        # Add a redirect that is not input port selective
+        #
+        self.vapi.ip_punt_redirect(0xffffffff,
+                                   self.pg1.sw_if_index,
+                                   nh_addr,
+                                   is_ip6=1)
+        self.send_and_expect(self.pg0, pkts, self.pg1)
+
+        self.vapi.ip_punt_redirect(0xffffffff,
+                                   self.pg1.sw_if_index,
+                                   nh_addr,
+                                   is_add=0,
+                                   is_ip6=1)
+
 if __name__ == '__main__':
     unittest.main(testRunner=VppTestRunner)