srv6-ad: Adding support for L2 traffic

Change-Id: I3c14555113c2b58f3be629600051beb7f6716cfe
Signed-off-by: Francois Clad <fclad@cisco.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/test/test_srv6_ad.py b/test/test_srv6_ad.py
index 13979ba13a2..75d9d12da48 100644
--- a/test/test_srv6_ad.py
+++ b/test/test_srv6_ad.py
@@ -408,6 +408,136 @@ class TestSRv6(VppTestCase):
 
         self.logger.debug("packet verification: SUCCESS")
 
+    def test_SRv6_End_AD_L2(self):
+        """ Test SRv6 End.AD behavior with L2 traffic.
+        """
+        self.src_addr = 'a0::'
+        self.sid_list = ['a1::', 'a2::a4', 'a3::']
+        self.test_sid_index = 1
+
+        # send traffic to one destination interface
+        # source and destination interfaces are IPv6 only
+        self.setup_interfaces(ipv6=[True, False])
+
+        # configure route to next segment
+        route = VppIpRoute(self, self.sid_list[self.test_sid_index + 1], 128,
+                           [VppRoutePath(self.pg0.remote_ip6,
+                                         self.pg0.sw_if_index,
+                                         proto=DpoProto.DPO_PROTO_IP6)],
+                           is_ip6=1)
+        route.add_vpp_config()
+
+        # configure SRv6 localSID behavior
+        cli_str = "sr localsid address " + \
+                  self.sid_list[self.test_sid_index] + \
+                  " behavior end.ad" + \
+                  " oif " + self.pg1.name + \
+                  " iif " + self.pg1.name
+        self.vapi.cli(cli_str)
+
+        # log the localsids
+        self.logger.debug(self.vapi.cli("show sr localsid"))
+
+        # send one packet per packet size
+        count = len(self.pg_packet_sizes)
+
+        # prepare L2 in SRv6 headers
+        packet_header1 = self.create_packet_header_IPv6_SRH_L2(
+            srcaddr=self.src_addr,
+            sidlist=self.sid_list[::-1],
+            segleft=len(self.sid_list) - self.test_sid_index - 1,
+            vlan=0)
+
+        # generate packets (pg0->pg1)
+        pkts1 = self.create_stream(self.pg0, self.pg1, packet_header1,
+                                   self.pg_packet_sizes, count)
+
+        # send packets and verify received packets
+        self.send_and_verify_pkts(self.pg0, pkts1, self.pg1,
+                                  self.compare_rx_tx_packet_End_AD_L2_out)
+
+        # log the localsid counters
+        self.logger.info(self.vapi.cli("show sr localsid"))
+
+        # prepare L2 header for returning packets
+        packet_header2 = self.create_packet_header_L2()
+
+        # generate returning packets (pg1->pg0)
+        pkts2 = self.create_stream(self.pg1, self.pg0, packet_header2,
+                                   self.pg_packet_sizes, count)
+
+        # send packets and verify received packets
+        self.send_and_verify_pkts(self.pg1, pkts2, self.pg0,
+                                  self.compare_rx_tx_packet_End_AD_L2_in)
+
+        # log the localsid counters
+        self.logger.info(self.vapi.cli("show sr localsid"))
+
+        # remove SRv6 localSIDs
+        cli_str = "sr localsid del address " + \
+                  self.sid_list[self.test_sid_index]
+        self.vapi.cli(cli_str)
+
+        # cleanup interfaces
+        self.teardown_interfaces()
+
+    def compare_rx_tx_packet_End_AD_L2_out(self, tx_pkt, rx_pkt):
+        """ Compare input and output packet after passing End.AD with L2
+
+        :param tx_pkt: transmitted packet
+        :param rx_pkt: received packet
+        """
+
+        # get IPv4 header of rx'ed packet
+        rx_eth = rx_pkt.getlayer(Ether)
+
+        tx_ip = tx_pkt.getlayer(IPv6)
+        # we can't just get the 2nd Ether layer
+        # get the Raw content and dissect it as Ether
+        tx_eth1 = Ether(str(tx_pkt[Raw]))
+
+        # verify if rx'ed packet has no SRH
+        self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
+
+        # the whole rx_eth pkt should be equal to tx_eth1
+        self.assertEqual(rx_eth, tx_eth1)
+
+        self.logger.debug("packet verification: SUCCESS")
+
+    def compare_rx_tx_packet_End_AD_L2_in(self, tx_pkt, rx_pkt):
+        """ Compare input and output packet after passing End.AD
+
+        :param tx_pkt: transmitted packet
+        :param rx_pkt: received packet
+        """
+
+        ####
+        # get first (outer) IPv6 header of rx'ed packet
+        rx_ip = rx_pkt.getlayer(IPv6)
+        # received ip.src should be equal to SR Policy source
+        self.assertEqual(rx_ip.src, self.src_addr)
+        # received ip.dst should be equal to expected sidlist next segment
+        self.assertEqual(rx_ip.dst, self.sid_list[self.test_sid_index + 1])
+
+        # rx'ed packet should have SRH
+        self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
+
+        # get SRH
+        rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
+        # rx'ed seglist should be equal to SID-list in reversed order
+        self.assertEqual(rx_srh.addresses, self.sid_list[::-1])
+        # segleft should be equal to previous segleft value minus 1
+        self.assertEqual(rx_srh.segleft,
+                         len(self.sid_list) - self.test_sid_index - 2)
+        # lastentry should be equal to the SID-list length minus 1
+        self.assertEqual(rx_srh.lastentry, len(self.sid_list) - 1)
+
+        # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
+        tx_ether = tx_pkt.getlayer(Ether)
+        self.assertEqual(Ether(str(rx_srh.payload)), tx_ether)
+
+        self.logger.debug("packet verification: SUCCESS")
+
     def create_stream(self, src_if, dst_if, packet_header, packet_sizes,
                       count):
         """Create SRv6 input packet stream for defined interface.
@@ -547,6 +677,50 @@ class TestSRv6(VppTestCase):
             UDP(sport=1234, dport=1234)
         return p
 
+    def create_packet_header_L2(self, vlan=0):
+        """Create packet header: L2 header
+
+        :param vlan: if vlan!=0 then add 802.1q header
+        """
+        # Note: the dst addr ('00:55:44:33:22:11') is used in
+        # the compare function compare_rx_tx_packet_T_Encaps_L2
+        # to detect presence of L2 in SRH payload
+        p = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11')
+        etype = 0x8137  # IPX
+        if vlan:
+            # add 802.1q layer
+            p /= Dot1Q(vlan=vlan, type=etype)
+        else:
+            p.type = etype
+        return p
+
+    def create_packet_header_IPv6_SRH_L2(self, srcaddr, sidlist, segleft,
+                                         vlan=0):
+        """Create packet header: L2 encapsulated in SRv6:
+        IPv6 header with SRH, L2
+
+        :param int srcaddr: IPv6 source address
+        :param list sidlist: segment list of outer IPv6 SRH
+        :param int segleft: segments-left field of outer IPv6 SRH
+        :param vlan: L2 vlan; if vlan!=0 then add 802.1q header
+
+        IPv6 source address is set to srcaddr
+        IPv6 destination address is set to sidlist[segleft]
+        """
+        eth = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11')
+        etype = 0x8137  # IPX
+        if vlan:
+            # add 802.1q layer
+            eth /= Dot1Q(vlan=vlan, type=etype)
+        else:
+            eth.type = etype
+
+        p = IPv6(src=srcaddr, dst=sidlist[segleft]) / \
+            IPv6ExtHdrSegmentRouting(addresses=sidlist,
+                                     segleft=segleft, nh=59) / \
+            eth
+        return p
+
     def get_payload_info(self, packet):
         """ Extract the payload_info from the packet
         """