ip: add classifier-based ACLs support on ip punt

This feature allows one to add classifier-based ACLs on packets punted
from the ip infra, eg. to only whitelist specific sender(s).

Type: feature

Change-Id: Idab37b188583efbca980038875fc3e540cb2e880
Signed-off-by: Benoît Ganne <bganne@cisco.com>

test/test_classifier.py

@@ -13,6 +13,7 @@ from util import ppp
 from template_classifier import TestClassifier, VarMask, VarMatch
 from vpp_ip_route import VppIpRoute, VppRoutePath
 from vpp_ip import INVALID_INDEX
+from vpp_papi import VppEnum
 
 
 # Tests split to different test case classes because of issue reported in
@@ -843,5 +844,81 @@ class TestClassifierPBR(TestClassifier):
         # and the table should be gone.
         self.assertFalse(self.verify_vrf(self.pbr_vrfid))
 
+
+class TestClassifierPunt(TestClassifier):
+    """ Classifier punt Test Case """
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestClassifierPunt, cls).setUpClass()
+
+    @classmethod
+    def tearDownClass(cls):
+        super(TestClassifierPunt, cls).tearDownClass()
+
+    def test_punt_udp(self):
+        """ IPv4/UDP protocol punt ACL test
+
+        Test scenario for basic punt ACL with UDP protocol
+            - Create IPv4 stream for pg0 -> pg1 interface.
+            - Create punt ACL with UDP IP protocol.
+            - Send and verify received packets on pg1 interface.
+        """
+
+        sport = 6754
+        dport = 17923
+
+        key = 'ip4_udp_punt'
+        self.create_classify_table(
+            key,
+            self.build_ip_mask(
+                src_ip='ffffffff',
+                proto='ff',
+                src_port='ffff'))
+        table_index = self.acl_tbl_idx.get(key)
+        self.vapi.punt_acl_add_del(ip4_table_index=table_index)
+        self.acl_active_table = key
+
+        # punt udp packets to dport received on pg0 through pg1
+        self.vapi.set_punt(
+            is_add=1,
+            punt={
+                'type': VppEnum.vl_api_punt_type_t.PUNT_API_TYPE_L4,
+                'punt': {
+                    'l4': {
+                        'af': VppEnum.vl_api_address_family_t.ADDRESS_IP4,
+                        'protocol': VppEnum.vl_api_ip_proto_t.IP_API_PROTO_UDP,
+                        'port': dport,
+                    }}})
+        self.vapi.ip_punt_redirect(punt={
+            'rx_sw_if_index': self.pg0.sw_if_index,
+            'tx_sw_if_index': self.pg1.sw_if_index,
+            'nh': self.pg1.remote_ip4,
+        })
+
+        pkts = [(Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                 IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
+                 UDP(sport=sport, dport=dport) /
+                 Raw('\x17' * 100))] * 2
+
+        # allow a session but not matching the stream: expect to drop
+        self.create_classify_session(
+            table_index,
+            self.build_ip_match(src_ip=self.pg0.remote_ip4,
+                                proto=socket.IPPROTO_UDP, src_port=sport + 10))
+        self.send_and_assert_no_replies(self.pg0, pkts)
+
+        # allow a session matching the stream: expect to pass
+        self.create_classify_session(
+            table_index,
+            self.build_ip_match(src_ip=self.pg0.remote_ip4,
+                                proto=socket.IPPROTO_UDP, src_port=sport))
+        self.send_and_expect_only(self.pg0, pkts, self.pg1)
+
+        # cleanup
+        self.acl_active_table = ''
+        self.vapi.punt_acl_add_del(ip4_table_index=table_index, is_add=0)
+
+
 if __name__ == '__main__':
     unittest.main(testRunner=VppTestRunner)