MAP: Add check for well known ports.

And more unit-tests.

Change-Id: I4667d82d928b7ba8d96b5a5648d464115b3ed216
Signed-off-by: Ole Troan <ot@cisco.com>

src/plugins/map/ip4_map_t.c

@@ -736,6 +736,14 @@ ip4_map_t (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
 	  ip4_map_t_classify (p0, d0, ip40, ip4_len0, &map_port0, &error0,
 			      &next0);
 
+	  /* Verify that port is not among the well-known ports */
+	  if ((d0->psid_length > 0 && d0->psid_offset > 0)
+	      && (clib_net_to_host_u16 (map_port0) <
+		  (0x1 << (16 - d0->psid_offset))))
+	    {
+	      error0 = MAP_ERROR_SEC_CHECK;
+	    }
+
 	  //Add MAP-T pseudo header in front of the packet
 	  vlib_buffer_advance (p0, -sizeof (*pheader0));
 	  pheader0 = vlib_buffer_get_current (p0);

test/test_map.py

@@ -8,8 +8,8 @@ from vpp_ip import DpoProto
 from vpp_ip_route import VppIpRoute, VppRoutePath
 
 from scapy.layers.l2 import Ether, Raw
-from scapy.layers.inet import IP, UDP, ICMP
+from scapy.layers.inet import IP, UDP, ICMP, TCP, fragment
-from scapy.layers.inet6 import IPv6
+from scapy.layers.inet6 import IPv6, ICMPv6TimeExceeded
 
 
 class TestMAP(VppTestCase):
@@ -163,5 +163,150 @@ class TestMAP(VppTestCase):
         pre_res_route.remove_vpp_config()
         self.vapi.ppcli("map params pre-resolve del ip6-nh 4001::1")
 
+    def validate(self, rx, expected):
+        self.assertEqual(rx, expected.__class__(str(expected)))
+
+    def payload(self, len):
+        return 'x' * len
+
+    def test_map_t(self):
+        """ MAP-T """
+
+        #
+        # Add a domain that maps from pg0 to pg1
+        #
+        map_dst = socket.inet_pton(socket.AF_INET6, "2001:db8::")
+        map_src = socket.inet_pton(socket.AF_INET6, "1234:5678:90ab:cdef::")
+        ip4_pfx = socket.inet_pton(socket.AF_INET, "192.168.0.0")
+
+        self.vapi.map_add_domain(map_dst, 32, map_src, 64, ip4_pfx,
+                                 24, 16, 6, 4, 1)
+
+        # Enable MAP-T on interfaces.
+
+        # self.vapi.map_if_enable_disable(1, self.pg0.sw_if_index, 1)
+        # self.vapi.map_if_enable_disable(1, self.pg1.sw_if_index, 1)
+
+        map_route = VppIpRoute(self,
+                               "2001:db8::",
+                               32,
+                               [VppRoutePath(self.pg1.remote_ip6,
+                                             self.pg1.sw_if_index,
+                                             proto=DpoProto.DPO_PROTO_IP6)],
+                               is_ip6=1)
+        map_route.add_vpp_config()
+
+        #
+        # Send a v4 packet that will be translated
+        #
+        p_ether = Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+        p_ip4 = IP(src=self.pg0.remote_ip4, dst='192.168.0.1')
+        payload = TCP(sport=0xabcd, dport=0xabcd)
+
+        p4 = (p_ether / p_ip4 / payload)
+        p6_translated = (IPv6(src="1234:5678:90ab:cdef:ac:1001:200:0",
+                              dst="2001:db8:1f0::c0a8:1:f") / payload)
+        p6_translated.hlim -= 1
+        rx = self.send_and_expect(self.pg0, p4*1, self.pg1)
+        for p in rx:
+            self.validate(p[1], p6_translated)
+
+        # Send back an IPv6 packet that will be "untranslated"
+        p_ether6 = Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac)
+        p_ip6 = IPv6(src='2001:db8:1f0::c0a8:1:f',
+                     dst='1234:5678:90ab:cdef:ac:1001:200:0')
+        p6 = (p_ether6 / p_ip6 / payload)
+        p4_translated = (IP(src='192.168.0.1',
+                            dst=self.pg0.remote_ip4) / payload)
+        p4_translated.id = 0
+        p4_translated.ttl -= 1
+        rx = self.send_and_expect(self.pg1, p6*1, self.pg0)
+        for p in rx:
+            self.validate(p[1], p4_translated)
+
+        # IPv4 TTL
+        ip4_ttl_expired = IP(src=self.pg0.remote_ip4, dst='192.168.0.1', ttl=0)
+        p4 = (p_ether / ip4_ttl_expired / payload)
+
+        icmp4_reply = (IP(id=0, ttl=254, src=self.pg0.local_ip4,
+                          dst=self.pg0.remote_ip4) /
+                       ICMP(type='time-exceeded',
+                            code='ttl-zero-during-transit') /
+                       IP(src=self.pg0.remote_ip4,
+                          dst='192.168.0.1', ttl=0) / payload)
+        rx = self.send_and_expect(self.pg0, p4*1, self.pg0)
+        for p in rx:
+            self.validate(p[1], icmp4_reply)
+
+        '''
+        This one is broken, cause it would require hairpinning...
+        # IPv4 TTL TTL1
+        ip4_ttl_expired = IP(src=self.pg0.remote_ip4, dst='192.168.0.1', ttl=1)
+        p4 = (p_ether / ip4_ttl_expired / payload)
+
+        icmp4_reply = IP(id=0, ttl=254, src=self.pg0.local_ip4,
+        dst=self.pg0.remote_ip4) / \
+        ICMP(type='time-exceeded', code='ttl-zero-during-transit' ) / \
+        IP(src=self.pg0.remote_ip4, dst='192.168.0.1', ttl=0) / payload
+        rx = self.send_and_expect(self.pg0, p4*1, self.pg0)
+        for p in rx:
+            self.validate(p[1], icmp4_reply)
+        '''
+
+        # IPv6 Hop limit
+        ip6_hlim_expired = IPv6(hlim=0, src='2001:db8:1ab::c0a8:1:ab',
+                                dst='1234:5678:90ab:cdef:ac:1001:200:0')
+        p6 = (p_ether6 / ip6_hlim_expired / payload)
+
+        icmp6_reply = (IPv6(hlim=255, src=self.pg1.local_ip6,
+                            dst="2001:db8:1ab::c0a8:1:ab") /
+                       ICMPv6TimeExceeded(code=0) /
+                       IPv6(src="2001:db8:1ab::c0a8:1:ab",
+                            dst='1234:5678:90ab:cdef:ac:1001:200:0',
+                            hlim=0) / payload)
+        rx = self.send_and_expect(self.pg1, p6*1, self.pg1)
+        for p in rx:
+            self.validate(p[1], icmp6_reply)
+
+        # IPv4 Well-known port
+        p_ip4 = IP(src=self.pg0.remote_ip4, dst='192.168.0.1')
+        payload = UDP(sport=200, dport=200)
+        p4 = (p_ether / p_ip4 / payload)
+        self.send_and_assert_no_replies(self.pg0, p4*1)
+
+        # IPv6 Well-known port
+        payload = UDP(sport=200, dport=200)
+        p6 = (p_ether6 / p_ip6 / payload)
+        self.send_and_assert_no_replies(self.pg1, p6*1)
+
+        # Packet fragmentation
+        payload = UDP(sport=40000, dport=4000) / self.payload(1453)
+        p4 = (p_ether / p_ip4 / payload)
+        self.pg_enable_capture()
+        self.pg0.add_stream(p4)
+        self.pg_start()
+        rx = self.pg1.get_capture(2)
+        for p in rx:
+            pass
+            # TODO: Manual validation
+            # self.validate(p[1], icmp4_reply)
+
+        # Packet fragmentation send fragments
+        payload = UDP(sport=40000, dport=4000) / self.payload(1453)
+        p4 = (p_ether / p_ip4 / payload)
+        frags = fragment(p4, fragsize=1000)
+        self.pg_enable_capture()
+        self.pg0.add_stream(frags)
+        self.pg_start()
+        rx = self.pg1.get_capture(2)
+        for p in rx:
+            pass
+            # p.show2()
+        # reass_pkt = reassemble(rx)
+        # p4_reply.ttl -= 1
+        # p4_reply.id = 256
+        # self.validate(reass_pkt, p4_reply)
+
+
 if __name__ == '__main__':
     unittest.main(testRunner=VppTestRunner)