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"""
  BIER Tables and Routes
"""

import socket
from vpp_object import VppObject
from vpp_ip_route import MPLS_LABEL_INVALID, VppRoutePath, VppMplsLabel


class BIER_HDR_PAYLOAD:
    BIER_HDR_PROTO_MPLS_DOWN_STREAM = 1
    BIER_HDR_PROTO_MPLS_UP_STREAM = 2
    BIER_HDR_PROTO_ETHERNET = 3
    BIER_HDR_PROTO_IPV4 = 4
    BIER_HDR_PROTO_IPV6 = 5
    BIER_HDR_PROTO_VXLAN = 6
    BIER_HDR_PROTO_CTRL = 7
    BIER_HDR_PROTO_OAM = 8


class VppBierTableID():
    def __init__(self, sub_domain_id, set_id, hdr_len_id):
        self.set_id = set_id
        self.sub_domain_id = sub_domain_id
        self.hdr_len_id = hdr_len_id


def find_bier_table(test, bti):
    tables = test.vapi.bier_table_dump()
    for t in tables:
        if bti.set_id == t.bt_tbl_id.bt_set \
           and bti.sub_domain_id == t.bt_tbl_id.bt_sub_domain \
           and bti.hdr_len_id == t.bt_tbl_id.bt_hdr_len_id:
            return True
    return False


def find_bier_route(test, bti, bp):
    routes = test.vapi.bier_route_dump(bti)
    for r in routes:
        if bti.set_id == r.br_route.br_tbl_id.bt_set \
           and bti.sub_domain_id == r.br_route.br_tbl_id.bt_sub_domain \
           and bti.hdr_len_id == r.br_route.br_tbl_id.bt_hdr_len_id \
           and bp == r.br_route.br_bp:
            return True
    return False


def find_bier_disp_table(test, bdti):
    tables = test.vapi.bier_disp_table_dump()
    for t in tables:
        if bdti == t.bdt_tbl_id:
            return True
    return False


def find_bier_disp_entry(test, bdti, bp):
    entries = test.vapi.bier_disp_entry_dump(bdti)
    for e in entries:
        if bp == e.bde_bp \
           and bdti == e.bde_tbl_id:
            return True
    return False


def find_bier_imp(test, bti, bp):
    imps = test.vapi.bier_imp_dump()
    for i in imps:
        if bti.set_id == i.bi_tbl_id.bt_set \
           and bti.sub_domain_id == i.bi_tbl_id.bt_sub_domain \
           and bti.hdr_len_id == i.bi_tbl_id.bt_hdr_len_id \
           and bp == i.bi_src:
            return True
    return False


class VppBierTable(VppObject):
    """
    BIER Table
    """

    def __init__(self, test, id, mpls_label):
        self._test = test
        self.id = id
        self.mpls_label = mpls_label

    def add_vpp_config(self):
        self._test.vapi.bier_table_add_del(
            self.id,
            self.mpls_label,
            is_add=1)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.bier_table_add_del(
            self.id,
            self.mpls_label,
            is_add=0)

    def object_id(self):
        return "bier-table;[%d:%d:%d]" % (self.id.set_id,
                                          self.id.sub_domain_id,
                                          self.id.hdr_len_id)

    def query_vpp_config(self):
        return find_bier_table(self._test, self.id)


class VppBierRoute(VppObject):
    """
    BIER route
    """

    def __init__(self, test, tbl_id, bp, paths):
        self._test = test
        self.tbl_id = tbl_id
        self.bp = bp
        self.paths = paths
        self.encoded_paths = []
        for path in self.paths:
            self.encoded_paths.append(path.encode())

    def add_vpp_config(self):
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            self.encoded_paths,
            is_add=1)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            self.encoded_paths,
            is_add=0)

    def update_paths(self, paths):
        self.paths = paths
        self.encoded_paths = []
        for path in self.paths:
            self.encoded_paths.append(path.encode())
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            self.encoded_paths,
            is_replace=1)

    def add_path(self, path):
        self.encoded_paths.append(path.encode())
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            [path.encode()],
            is_add=1,
            is_replace=0)
        self.paths.append(path)
        self._test.registry.register(self, self._test.logger)

    def remove_path(self, path):
        self.encoded_paths.remove(path.encode())
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            [path.encode()],
            is_add=0,
            is_replace=0)
        self.paths.remove(path)

    def remove_all_paths(self):
        self._test.vapi.bier_route_add_del(
            self.tbl_id,
            self.bp,
            [],
            is_add=0,
            is_replace=1)
        self.paths = []

    def object_id(self):
        return "bier-route;[%d:%d:%d:%d]" % (self.tbl_id.set_id,
                                             self.tbl_id.sub_domain_id,
                                             self.tbl_id.hdr_len_id,
                                             self.bp)

    def query_vpp_config(self):
        return find_bier_route(self._test, self.tbl_id, self.bp)


class VppBierImp(VppObject):
    """
    BIER route
    """

    def __init__(self, test, tbl_id, src, ibytes):
        self._test = test
        self.tbl_id = tbl_id
        self.ibytes = ibytes
        self.src = src

    def add_vpp_config(self):
        res = self._test.vapi.bier_imp_add(
            self.tbl_id,
            self.src,
            self.ibytes)
        self.bi_index = res.bi_index
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.bier_imp_del(
            self.bi_index)

    def object_id(self):
        return "bier-imp;[%d:%d:%d:%d]" % (self.tbl_id.set_id,
                                           self.tbl_id.sub_domain_id,
                                           self.tbl_id.hdr_len_id,
                                           self.src)

    def query_vpp_config(self):
        return find_bier_imp(self._test, self.tbl_id, self.src)


class VppBierDispTable(VppObject):
    """
    BIER Disposition Table
    """

    def __init__(self, test, id):
        self._test = test
        self.id = id

    def add_vpp_config(self):
        self._test.vapi.bier_disp_table_add_del(
            self.id,
            is_add=1)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.bier_disp_table_add_del(
            self.id,
            is_add=0)

    def object_id(self):
        return "bier-disp-table;[%d]" % (self.id)

    def query_vpp_config(self):
        return find_bier_disp_table(self._test, self.id)


class VppBierDispEntry(VppObject):
    """
    BIER Disposition Entry
    """

    def __init__(self, test, tbl_id, bp, payload_proto, nh_proto,
                 nh, nh_tbl, rpf_id=~0):
        self._test = test
        self.tbl_id = tbl_id
        self.nh_tbl = nh_tbl
        self.nh_proto = nh_proto
        self.bp = bp
        self.payload_proto = payload_proto
        self.rpf_id = rpf_id
        self.nh = socket.inet_pton(socket.AF_INET, nh)

    def add_vpp_config(self):
        self._test.vapi.bier_disp_entry_add_del(
            self.tbl_id,
            self.bp,
            self.payload_proto,
            self.nh_proto,
            self.nh,
            self.nh_tbl,
            self.rpf_id,
            is_add=1)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.bier_disp_entry_add_del(
            self.tbl_id,
            self.bp,
            self.payload_proto,
            self.nh_proto,
            self.nh,
            self.nh_tbl,
            self.rpf_id,
            is_add=0)

    def object_id(self):
        return "bier-disp-entry;[%d:%d]" % (self.tbl_id,
                                            self.bp)

    def query_vpp_config(self):
        return find_bier_disp_entry(self._test, self.tbl_id, self.bp)
>) # 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_IPv6_out) # log the localsid counters self.logger.info(self.vapi.cli("show sr localsid")) # prepare IPv6 header for returning packets packet_header2 = self.create_packet_header_IPv6() # 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_IPv6_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_IPv6_out(self, tx_pkt, rx_pkt): """ Compare input and output packet after passing End.AD with IPv6 :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) tx_ip = tx_pkt.getlayer(IPv6) tx_ip2 = tx_pkt.getlayer(IPv6, 2) # verify if rx'ed packet has no SRH self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) # the whole rx_ip pkt should be equal to tx_ip2 # except for the hlim field # -> adjust tx'ed hlim to expected hlim tx_ip2.hlim = tx_ip2.hlim - 1 self.assertEqual(rx_ip, tx_ip2) self.logger.debug("packet verification: SUCCESS") def compare_rx_tx_packet_End_AD_IPv6_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 # except for the hop-limit field tx_ip = tx_pkt.getlayer(IPv6) # -> update tx'ed hlim to the expected hlim tx_ip.hlim -= 1 # -> check payload self.assertEqual(rx_srh.payload, tx_ip) self.logger.debug("packet verification: SUCCESS") def test_SRv6_End_AD_IPv4(self): """ Test SRv6 End.AD behavior with IPv4 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], ipv4=[False, True]) # 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" + \ " nh " + self.pg1.remote_ip4 + \ " 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 IPv4 in SRv6 headers packet_header1 = self.create_packet_header_IPv6_SRH_IPv4( srcaddr=self.src_addr, sidlist=self.sid_list[::-1], segleft=len(self.sid_list) - self.test_sid_index - 1) # 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_IPv4_out) # log the localsid counters self.logger.info(self.vapi.cli("show sr localsid")) # prepare IPv6 header for returning packets packet_header2 = self.create_packet_header_IPv4() # 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_IPv4_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_IPv4_out(self, tx_pkt, rx_pkt): """ Compare input and output packet after passing End.AD with IPv4 :param tx_pkt: transmitted packet :param rx_pkt: received packet """ # get IPv4 header of rx'ed packet rx_ip = rx_pkt.getlayer(IP) tx_ip = tx_pkt.getlayer(IPv6) tx_ip2 = tx_pkt.getlayer(IP) # verify if rx'ed packet has no SRH self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) # the whole rx_ip pkt should be equal to tx_ip2 # except for the ttl field and ip checksum # -> adjust tx'ed ttl to expected ttl tx_ip2.ttl = tx_ip2.ttl - 1 # -> set tx'ed ip checksum to None and let scapy recompute tx_ip2.chksum = None # read back the pkt (with str()) to force computing these fields # probably other ways to accomplish this are possible tx_ip2 = IP(str(tx_ip2)) self.assertEqual(rx_ip, tx_ip2) self.logger.debug("packet verification: SUCCESS") def compare_rx_tx_packet_End_AD_IPv4_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 # except for the ttl field and ip checksum tx_ip = tx_pkt.getlayer(IP) # -> adjust tx'ed ttl to expected ttl tx_ip.ttl = tx_ip.ttl - 1 # -> set tx'ed ip checksum to None and let scapy recompute tx_ip.chksum = None # -> read back the pkt (with str()) to force computing these fields # probably other ways to accomplish this are possible self.assertEqual(rx_srh.payload, IP(str(tx_ip))) 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. :param VppInterface src_if: Interface to create packet stream for :param VppInterface dst_if: destination interface of packet stream :param packet_header: Layer3 scapy packet headers, L2 is added when not provided, Raw(payload) with packet_info is added :param list packet_sizes: packet stream pckt sizes,sequentially applied to packets in stream have :param int count: number of packets in packet stream :return: list of packets """ self.logger.info("Creating packets") pkts = [] for i in range(0, count - 1): payload_info = self.create_packet_info(src_if, dst_if) self.logger.debug( "Creating packet with index %d" % (payload_info.index)) payload = self.info_to_payload(payload_info) # add L2 header if not yet provided in packet_header if packet_header.getlayer(0).name == 'Ethernet': p = packet_header / Raw(payload) else: p = Ether(dst=src_if.local_mac, src=src_if.remote_mac) / \ packet_header / Raw(payload) size = packet_sizes[i % len(packet_sizes)] self.logger.debug("Packet size %d" % (size)) self.extend_packet(p, size) # we need to store the packet with the automatic fields computed # read back the dumped packet (with str()) # to force computing these fields # probably other ways are possible p = Ether(str(p)) payload_info.data = p.copy() self.logger.debug(ppp("Created packet:", p)) pkts.append(p) self.logger.info("Done creating packets") return pkts def send_and_verify_pkts(self, input, pkts, output, compare_func): """Send packets and verify received packets using compare_func :param input: ingress interface of DUT :param pkts: list of packets to transmit :param output: egress interface of DUT :param compare_func: function to compare in and out packets """ # add traffic stream to input interface input.add_stream(pkts) # enable capture on all interfaces self.pg_enable_capture(self.pg_interfaces) # start traffic self.logger.info("Starting traffic") self.pg_start() # get output capture self.logger.info("Getting packet capture") capture = output.get_capture() # assert nothing was captured on input interface # input.assert_nothing_captured() # verify captured packets self.verify_captured_pkts(output, capture, compare_func) def create_packet_header_IPv6(self): """Create packet header: IPv6 header, UDP header :param dst: IPv6 destination address IPv6 source address is 1234::1 IPv6 destination address is 4321::1 UDP source port and destination port are 1234 """ p = IPv6(src='1234::1', dst='4321::1') / UDP(sport=1234, dport=1234) return p def create_packet_header_IPv6_SRH_IPv6(self, srcaddr, sidlist, segleft): """Create packet header: IPv6 encapsulated in SRv6: IPv6 header with SRH, IPv6 header, UDP header :param int srcaddr: outer source address :param list sidlist: segment list of outer IPv6 SRH :param int segleft: segments-left field of outer IPv6 SRH Outer IPv6 source address is set to srcaddr Outer IPv6 destination address is set to sidlist[segleft] Inner IPv6 source addresses is 1234::1 Inner IPv6 destination address is 4321::1 UDP source port and destination port are 1234 """ p = IPv6(src=srcaddr, dst=sidlist[segleft]) / \ IPv6ExtHdrSegmentRouting(addresses=sidlist, segleft=segleft, nh=41) / \ IPv6(src='1234::1', dst='4321::1') / \ UDP(sport=1234, dport=1234) return p def create_packet_header_IPv4(self): """Create packet header: IPv4 header, UDP header :param dst: IPv4 destination address IPv4 source address is 123.1.1.1 IPv4 destination address is 124.1.1.1 UDP source port and destination port are 1234 """ p = IP(src='123.1.1.1', dst='124.1.1.1') / UDP(sport=1234, dport=1234) return p def create_packet_header_IPv6_SRH_IPv4(self, srcaddr, sidlist, segleft): """Create packet header: IPv4 encapsulated in SRv6: IPv6 header with SRH, IPv4 header, UDP header :param int srcaddr: outer source address :param list sidlist: segment list of outer IPv6 SRH :param int segleft: segments-left field of outer IPv6 SRH Outer IPv6 source address is set to srcaddr Outer IPv6 destination address is set to sidlist[segleft] Inner IPv4 source address is 123.1.1.1 Inner IPv4 destination address is 124.1.1.1 UDP source port and destination port are 1234 """ p = IPv6(src=srcaddr, dst=sidlist[segleft]) / \ IPv6ExtHdrSegmentRouting(addresses=sidlist, segleft=segleft, nh=4) / \ IP(src='123.1.1.1', dst='124.1.1.1') / \ 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 """ # in most cases, payload_info is in packet[Raw] # but packet[Raw] gives the complete payload # (incl L2 header) for the T.Encaps L2 case try: payload_info = self.payload_to_info(str(packet[Raw])) except: # remote L2 header from packet[Raw]: # take packet[Raw], convert it to an Ether layer # and then extract Raw from it payload_info = self.payload_to_info( str(Ether(str(packet[Raw]))[Raw])) return payload_info def verify_captured_pkts(self, dst_if, capture, compare_func): """ Verify captured packet stream for specified interface. Compare ingress with egress packets using the specified compare fn :param dst_if: egress interface of DUT :param capture: captured packets :param compare_func: function to compare in and out packet """ self.logger.info("Verifying capture on interface %s using function %s" % (dst_if.name, compare_func.func_name)) last_info = dict() for i in self.pg_interfaces: last_info[i.sw_if_index] = None dst_sw_if_index = dst_if.sw_if_index for packet in capture: try: # extract payload_info from packet's payload payload_info = self.get_payload_info(packet) packet_index = payload_info.index self.logger.debug("Verifying packet with index %d" % (packet_index)) # packet should have arrived on the expected interface self.assertEqual(payload_info.dst, dst_sw_if_index) self.logger.debug( "Got packet on interface %s: src=%u (idx=%u)" % (dst_if.name, payload_info.src, packet_index)) # search for payload_info with same src and dst if_index # this will give us the transmitted packet next_info = self.get_next_packet_info_for_interface2( payload_info.src, dst_sw_if_index, last_info[payload_info.src]) last_info[payload_info.src] = next_info # next_info should not be None self.assertTrue(next_info is not None) # index of tx and rx packets should be equal self.assertEqual(packet_index, next_info.index) # data field of next_info contains the tx packet txed_packet = next_info.data self.logger.debug(ppp("Transmitted packet:", txed_packet)) # ppp=Pretty Print Packet self.logger.debug(ppp("Received packet:", packet)) # compare rcvd packet with expected packet using compare_func compare_func(txed_packet, packet) except: self.logger.error(ppp("Unexpected or invalid packet:", packet)) raise # have all expected packets arrived? for i in self.pg_interfaces: remaining_packet = self.get_next_packet_info_for_interface2( i.sw_if_index, dst_sw_if_index, last_info[i.sw_if_index]) self.assertTrue(remaining_packet is None, "Interface %s: Packet expected from interface %s " "didn't arrive" % (dst_if.name, i.name)) if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)