コード例 #1
0
    def send_frame(self, frame_body):
        PACKET = Ether()
        PACKET.length = 64
        PACKET.dst = self.dst
        PACKET.src = self.getHwAddr(self.interface)
        if self.stag:
            # WARNING: September/2016: This should be 0x88a8, but the Intel 10G
            # hardware I am currently using does not support receiving a TPID of
            # 0x88a8. So, I send double CTAGs, and I usually set this to 0x8100.
            # (NOTE: The Intel hardware can send a TPID of 0x88a8)
            PACKET.type = 0x8100
            if self.ctag:
                PACKET/=Dot1Q(type=0x8100,vlan=int(self.stag))
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.ctag))
            else:
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.stag))
        else:
            if self.ctag:
                PACKET.type = 0x8100
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.ctag))
            else:
                PACKET.type = self.etype
#            PACKET/=Dot1Q(type=self.etype, vlan=int(self.ctag))
        PACKET/=SlowProtocolsSubtype()/FlagsBytes()/OAMPDU()
        PACKET/=frame_body
        PACKET/=EndOfPDU()
        if (self.verbose == True):
            PACKET.show()
            print '###[ Frame Length %d (before padding) ]###' % len(PACKET)
        if (self.hexdump == True):
            print hexdump(PACKET)
        if (self.dryrun != True):
            sendp(PACKET, iface=self.interface, verbose=self.verbose)
            time.sleep(self.sleep)
        return PACKET
コード例 #2
0
    def send_frame(self, frame_body):
        PACKET = Ether()
        PACKET.length = 64
        PACKET.dst = self.dst
        PACKET.src = self.getHwAddr(self.interface)
        if self.stag:
            # WARNING: September/2016: This should be 0x88a8, but the Intel 10G
            # hardware I am currently using does not support receiving a TPID of
            # 0x88a8. So, I send double CTAGs, and I usually set this to 0x8100.
            # (NOTE: The Intel hardware can send a TPID of 0x88a8)
            PACKET.type = 0x8100
            if self.ctag:
                PACKET/=Dot1Q(type=0x8100,vlan=int(self.stag))
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.ctag))
            else:
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.stag))
        else:
            if self.ctag:
                PACKET.type = 0x8100
                PACKET/=Dot1Q(type=self.etype,vlan=int(self.ctag))
            else:
                PACKET.type = self.etype
#            PACKET/=Dot1Q(type=self.etype, vlan=int(self.ctag))
        PACKET/=SlowProtocolsSubtype()/FlagsBytes()/OAMPDU()
        PACKET/=frame_body
        PACKET/=EndOfPDU()
        if (self.verbose == True):
            PACKET.show()
            print '###[ Frame Length %d (before padding) ]###' % len(PACKET)
        if (self.hexdump == True):
            print hexdump(PACKET)
        if (self.dryrun != True):
            sendp(PACKET, iface=self.interface, verbose=self.verbose)
            time.sleep(self.sleep)
        return PACKET
コード例 #3
0
ファイル: test_srv6_ad.py プロジェクト: mjnitp/vpp
    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
コード例 #4
0
ファイル: test_srv6_ad.py プロジェクト: chrisy/vpp
    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
コード例 #5
0
ファイル: lldp.py プロジェクト: dsaucez/l2
def create_lldp_packet(mac_addr, switch_name, port_id):
    # indicate the swith name
    chassis_tlv = Chassis_Id()
    chassis_tlv.subtype = 0x07
    chassis_tlv.length = len(switch_name) + 1
    chassis_tlv.locallyAssigned = switch_name

    # indicate the port ID
    port_tlv = Port_Id()
    port_tlv.subtype = 0x7
    port_tlv.length = len(port_id) + 1
    port_tlv.locallyAssigned = port_id

    # TTL
    ttl_tlv = TTL()
    ttl_tlv.length = 2
    ttl_tlv.seconds = 0
    
    # The end 
    end_tlv = EndOfPDU()

    # Create the frame
    frame = Ether()
    frame.src = mac_addr
    frame.dst = '01:80:c2:00:00:0e'
    frame.type = 0x88cc

    packet = frame / chassis_tlv / port_tlv / ttl_tlv / end_tlv
    return packet
コード例 #6
0
    async def recv(self):
        rx_header = await self.header_sink.recv()
        rx_payload = await self.payload_sink.recv()

        assert not rx_payload.tuser

        eth = Ether()
        eth.dst = rx_header.dest_mac.integer.to_bytes(6, 'big')
        eth.src = rx_header.src_mac.integer.to_bytes(6, 'big')
        eth.type = rx_header.type.integer
        rx_pkt = eth / bytes(rx_payload.tdata)

        return Ether(bytes(rx_pkt))
コード例 #7
0
async def run_test(dut,
                   payload_lengths=None,
                   payload_data=None,
                   idle_inserter=None,
                   backpressure_inserter=None):

    tb = TB(dut)

    await tb.reset()

    tb.set_idle_generator(idle_inserter)
    tb.set_backpressure_generator(backpressure_inserter)

    test_pkts = []
    test_frames = []

    for payload in [payload_data(x) for x in payload_lengths()]:
        eth = Ether(src='5A:51:52:53:54:55',
                    dst='DA:D1:D2:D3:D4:D5',
                    type=0x8000)
        test_pkt = eth / payload

        test_pkts.append(test_pkt.copy())
        test_frame = AxiStreamFrame(test_pkt.build())
        test_frames.append(test_frame)

        await tb.source.send(test_frame)

    for test_pkt, test_frame in zip(test_pkts, test_frames):
        rx_header = await tb.header_sink.recv()
        rx_payload = await tb.payload_sink.recv()

        eth = Ether()
        eth.dst = rx_header.dest_mac.integer.to_bytes(6, 'big')
        eth.src = rx_header.src_mac.integer.to_bytes(6, 'big')
        eth.type = rx_header.type.integer
        rx_pkt = eth / bytes(rx_payload.tdata)

        tb.log.info("RX packet: %s", repr(rx_pkt))

        assert rx_pkt.build() == test_pkt.build()
        assert not rx_payload.tuser

    assert tb.header_sink.empty()
    assert tb.payload_sink.empty()

    await RisingEdge(dut.clk)
    await RisingEdge(dut.clk)
コード例 #8
0
    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
コード例 #9
0
ファイル: test_srv6_ad.py プロジェクト: chrisy/vpp
    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
コード例 #10
0
    async def recv(self):
        rx_frame = await self.sink.recv()

        eth = Ether()
        eth.dst = rx_frame.eth_dest_mac.integer.to_bytes(6, 'big')
        eth.src = rx_frame.eth_src_mac.integer.to_bytes(6, 'big')
        eth.type = rx_frame.eth_type.integer
        arp = ARP()
        arp.hwtype = rx_frame.arp_htype.integer
        arp.ptype = rx_frame.arp_ptype.integer
        arp.hwlen = rx_frame.arp_hlen.integer
        arp.plen = rx_frame.arp_plen.integer
        arp.op = rx_frame.arp_oper.integer
        arp.hwsrc = rx_frame.arp_sha.integer.to_bytes(6, 'big')
        arp.psrc = rx_frame.arp_spa.integer
        arp.hwdst = rx_frame.arp_tha.integer.to_bytes(6, 'big')
        arp.pdst = rx_frame.arp_tpa.integer
        rx_pkt = eth / arp

        return Ether(bytes(rx_pkt))
コード例 #11
0
def main():
    """Send IP/IPv6 packet from one traffic generator interface to the other."""
    args = TrafficScriptArg([
        u"tg_src_mac", u"tg_dst_mac", u"src_ip", u"dst_ip", u"dut_if1_mac",
        u"dut_if2_mac"
    ], [
        u"encaps_tx", u"vlan_tx", u"vlan_outer_tx", u"encaps_rx", u"vlan_rx",
        u"vlan_outer_rx"
    ])

    tx_src_mac = args.get_arg(u"tg_src_mac")
    tx_dst_mac = args.get_arg(u"dut_if1_mac")
    rx_dst_mac = args.get_arg(u"tg_dst_mac")
    rx_src_mac = args.get_arg(u"dut_if2_mac")
    src_ip = args.get_arg(u"src_ip")
    dst_ip = args.get_arg(u"dst_ip")
    tx_if = args.get_arg(u"tx_if")
    rx_if = args.get_arg(u"rx_if")

    encaps_tx = args.get_arg(u"encaps_tx")
    vlan_tx = args.get_arg(u"vlan_tx")
    vlan_outer_tx = args.get_arg(u"vlan_outer_tx")
    encaps_rx = args.get_arg(u"encaps_rx")
    vlan_rx = args.get_arg(u"vlan_rx")
    vlan_outer_rx = args.get_arg(u"vlan_outer_rx")

    rxq = RxQueue(rx_if)
    txq = TxQueue(tx_if)

    sent_packets = list()
    pkt_raw = Ether(src=tx_src_mac, dst=tx_dst_mac)

    if encaps_tx == u"Dot1q":
        pkt_raw /= Dot1Q(vlan=int(vlan_tx))
    elif encaps_tx == u"Dot1ad":
        pkt_raw.type = 0x88a8
        pkt_raw /= Dot1Q(vlan=vlan_outer_tx)
        pkt_raw /= Dot1Q(vlan=vlan_tx)

    if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
        pkt_raw /= IP(src=src_ip, dst=dst_ip, proto=61)
        ip_format = IP
    elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
        pkt_raw /= IPv6(src=src_ip, dst=dst_ip)
        ip_format = IPv6
    else:
        raise ValueError(u"IP not in correct format")

    pkt_raw /= Raw()
    sent_packets.append(pkt_raw)
    txq.send(pkt_raw)

    while True:
        if tx_if == rx_if:
            ether = rxq.recv(2, ignore=sent_packets)
        else:
            ether = rxq.recv(2)

        if ether is None:
            raise RuntimeError(u"IP packet Rx timeout")

        if ether.haslayer(ICMPv6ND_NS):
            # read another packet in the queue if the current one is ICMPv6ND_NS
            continue
        else:
            # otherwise process the current packet
            break

    if rx_dst_mac == ether[Ether].dst and rx_src_mac == ether[Ether].src:
        logger.trace(u"MAC matched")
    else:
        raise RuntimeError(f"Matching packet unsuccessful: {ether!r}")

    if encaps_rx == u"Dot1q":
        if ether[Dot1Q].vlan == int(vlan_rx):
            logger.trace(u"VLAN matched")
        else:
            raise RuntimeError(f"Ethernet frame with wrong VLAN tag "
                               f"({ether[Dot1Q].vlan}-received, "
                               f"{vlan_rx}-expected):\n{ether!r}")
        ip = ether[Dot1Q].payload
    elif encaps_rx == u"Dot1ad":
        raise NotImplementedError()
    else:
        ip = ether.payload

    if not isinstance(ip, ip_format):
        raise RuntimeError(f"Not an IP packet received {ip!r}")

    # Compare data from packets
    if src_ip == ip.src:
        logger.trace(u"Src IP matched")
    else:
        raise RuntimeError(
            f"Matching Src IP unsuccessful: {src_ip} != {ip.src}")

    if dst_ip == ip.dst:
        logger.trace(u"Dst IP matched")
    else:
        raise RuntimeError(
            f"Matching Dst IP unsuccessful: {dst_ip} != {ip.dst}")

    sys.exit(0)
コード例 #12
0
def extract_one_packet(buf):
    """Extract one packet from the incoming buf buffer.

    Takes string as input and looks for first whole packet in it.
    If it finds one, it returns substring from the buf parameter.

    :param buf: String representation of incoming packet buffer.
    :type buf: str
    :returns: String representation of first packet in buf.
    :rtype: str
    """
    pkt_len = 0

    if len(buf) < 60:
        return None

    try:
        ether_type = Ether(buf[0:14]).type
    except AttributeError:
        raise RuntimeError(f"No EtherType in packet {buf!r}")

    if ether_type == ETH_P_IP:
        # 14 is Ethernet fame header size.
        # 4 bytes is just enough to look for length in ip header.
        # ip total length contains just the IP packet length so add the Ether
        #     header.
        pkt_len = Ether(buf[0:14 + 4]).len + 14
        if len(buf) < 60:
            return None
    elif ether_type == ETH_P_IPV6:
        if not Ether(buf[0:14 + 6]).haslayer(IPv6):
            raise RuntimeError(f"Invalid IPv6 packet {buf!r}")
        # ... to add to the above, 40 bytes is the length of IPV6 header.
        #   The ipv6.len only contains length of the payload and not the header
        pkt_len = Ether(buf)[u"IPv6"].plen + 14 + 40
        if len(buf) < 60:
            return None
    elif ether_type == ETH_P_ARP:
        pkt = Ether(buf[:20])
        if not pkt.haslayer(ARP):
            raise RuntimeError(u"Incomplete ARP packet")
        # len(eth) + arp(2 hw addr type + 2 proto addr type
        #                + 1b len + 1b len + 2b operation)

        pkt_len = 14 + 8
        pkt_len += 2 * pkt.getlayer(ARP).hwlen
        pkt_len += 2 * pkt.getlayer(ARP).plen

        del pkt
    elif ether_type == 32821:  # RARP (Reverse ARP)
        pkt = Ether(buf[:20])
        pkt.type = ETH_P_ARP  # Change to ARP so it works with scapy
        pkt = Ether(pkt)
        if not pkt.haslayer(ARP):
            pkt.show()
            raise RuntimeError(u"Incomplete RARP packet")

        # len(eth) + arp(2 hw addr type + 2 proto addr type
        #                + 1b len + 1b len + 2b operation)
        pkt_len = 14 + 8
        pkt_len += 2 * pkt.getlayer(ARP).hwlen
        pkt_len += 2 * pkt.getlayer(ARP).plen

        del pkt
    else:
        raise RuntimeError(f"Unknown protocol {ether_type}")

    if pkt_len < 60:
        pkt_len = 60

    if len(buf) < pkt_len:
        return None

    return buf[0:pkt_len]
コード例 #13
0
def main():
    """Send IP ICMP packet from one traffic generator interface to the other."""
    args = TrafficScriptArg([
        'tg_src_mac', 'tg_dst_mac', 'src_ip', 'dst_ip', 'dut_if1_mac',
        'dut_if2_mac'
    ], [
        'encaps_tx', 'vlan_tx', 'vlan_outer_tx', 'encaps_rx', 'vlan_rx',
        'vlan_outer_rx'
    ])

    tx_src_mac = args.get_arg('tg_src_mac')
    tx_dst_mac = args.get_arg('dut_if1_mac')
    rx_dst_mac = args.get_arg('tg_dst_mac')
    rx_src_mac = args.get_arg('dut_if2_mac')
    src_ip = args.get_arg('src_ip')
    dst_ip = args.get_arg('dst_ip')
    tx_if = args.get_arg('tx_if')
    rx_if = args.get_arg('rx_if')

    encaps_tx = args.get_arg('encaps_tx')
    vlan_tx = args.get_arg('vlan_tx')
    vlan_outer_tx = args.get_arg('vlan_outer_tx')
    encaps_rx = args.get_arg('encaps_rx')
    vlan_rx = args.get_arg('vlan_rx')
    vlan_outer_rx = args.get_arg('vlan_outer_rx')

    rxq = RxQueue(rx_if)
    txq = TxQueue(tx_if)
    sent_packets = []
    ip_format = ''
    pkt_raw = Ether(src=tx_src_mac, dst=tx_dst_mac)
    if encaps_tx == 'Dot1q':
        pkt_raw /= Dot1Q(vlan=int(vlan_tx))
    elif encaps_tx == 'Dot1ad':
        pkt_raw.type = 0x88a8
        pkt_raw /= Dot1Q(vlan=vlan_outer_tx)
        pkt_raw /= Dot1Q(vlan=vlan_tx)
    if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
        pkt_raw /= IP(src=src_ip, dst=dst_ip)
        pkt_raw /= ICMP()
        ip_format = IP
    elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
        pkt_raw /= IPv6(src=src_ip, dst=dst_ip)
        pkt_raw /= ICMPv6EchoRequest()
        ip_format = IPv6
    else:
        raise ValueError("IP not in correct format")

    sent_packets.append(pkt_raw)
    txq.send(pkt_raw)
    if tx_if == rx_if:
        ether = rxq.recv(2, ignore=sent_packets)
    else:
        ether = rxq.recv(2)

    if ether is None:
        raise RuntimeError("ICMP echo Rx timeout")

    if rx_dst_mac == ether[Ether].dst and rx_src_mac == ether[Ether].src:
        logger.trace("MAC matched")
    else:
        raise RuntimeError("Matching packet unsuccessful: {0}".format(
            ether.__repr__()))

    if encaps_rx == 'Dot1q':
        if ether[Dot1Q].vlan == int(vlan_rx):
            logger.trace("VLAN matched")
        else:
            raise RuntimeError('Ethernet frame with wrong VLAN tag ({}-'
                               'received, {}-expected):\n{}'.format(
                                   ether[Dot1Q].vlan, vlan_rx,
                                   ether.__repr__()))
        ip = ether[Dot1Q].payload
    elif encaps_rx == 'Dot1ad':
        raise NotImplementedError()
    else:
        ip = ether.payload

    if not isinstance(ip, ip_format):
        raise RuntimeError("Not an IP packet received {0}".format(
            ip.__repr__()))

    # Compare data from packets
    if src_ip == ip.src:
        logger.trace("Src IP matched")
    else:
        raise RuntimeError("Matching Src IP unsuccessful: {} != {}".format(
            src_ip, ip.src))

    if dst_ip == ip.dst:
        logger.trace("Dst IP matched")
    else:
        raise RuntimeError("Matching Dst IP unsuccessful: {} != {}".format(
            dst_ip, ip.dst))

    sys.exit(0)
コード例 #14
0
def main():
    """Send packet from one traffic generator interface to the other."""

    args = TrafficScriptArg([
        u"tg_if1_mac",
        u"dut_if1_mac",
        u"flow_type",
        u"proto",
    ], [u"src_ip", u"dst_ip", u"src_port", u"dst_port", u"value"])
    tx_if = args.get_arg(u"tx_if")
    tx_src_mac = args.get_arg(u"tg_if1_mac")
    tx_dst_mac = args.get_arg(u"dut_if1_mac")
    flow_type = args.get_arg(u"flow_type")
    proto = args.get_arg(u"proto")

    src = args.get_arg(u"src_ip")
    dst = args.get_arg(u"dst_ip")
    sport = eval(args.get_arg(u"src_port"))
    dport = eval(args.get_arg(u"dst_port"))
    value = eval(args.get_arg(u"value"))

    txq = TxQueue(tx_if)

    if flow_type == u"IP4":
        pkt_raw = (Ether(src=tx_src_mac, dst=tx_dst_mac) /
                   IP(src=src, dst=dst))
    elif flow_type == u"IP6":
        pkt_raw = (Ether(src=tx_src_mac, dst=tx_dst_mac) /
                   IPv6(src=src, dst=dst))
    elif flow_type == u"ETHER":
        pkt_raw = Ether(src=tx_src_mac, dst=tx_dst_mac)
    else:
        raise ValueError(f"Flow type error: {flow_type}")

    if proto == u"TCP":
        pkt_raw /= TCP(sport=sport, dport=dport)
    elif proto == u"UDP":
        pkt_raw /= UDP(sport=sport, dport=dport)
    elif proto == u"AH":
        pkt_raw /= AH(spi=value)
    elif proto == u"ESP":
        pkt_raw /= ESP(spi=value)
    elif proto == u"GTPU":
        pkt_raw /= (UDP() / GTP_U_Header(teid=value) /
                    IP(src=u"192.168.10.20"))
    elif proto == u"L2TPV3":
        value_hex = hex(value).replace('0x', (8 - len(hex(value)) + 2) * '0')
        session_id = binascii.a2b_hex(value_hex)
        pkt_raw.proto = 115
        pkt_raw /= Raw(session_id)
    elif proto == u"VXLAN":
        pkt_raw /= (UDP() / VXLAN(vni=value))
    elif proto == u"ARP":
        pkt_raw.type = value
        pkt_raw /= ARP()
    else:
        raise ValueError(f"Flow proto error: {proto}")

    pkt_raw /= Raw()
    txq.send(pkt_raw)
    sys.exit(0)
コード例 #15
0
 def getIPPacket(self):
     """
     构造IP数据包
     :return:
     """
     # chksum = self.entries[9].get()
     try:
         eth = Ether()
         eth.src = self.entries[0].get()
         eth.dst = self.entries[1].get()
         eth.type = int(self.entries[2].get())
         ip_packet = IP()
         ip_packet.versionion = int(self.entries[3].get())
         ip_packet.ihl = int(self.entries[4].get())
         ip_packet.tos = int(self.entries[5].get())
         ip_packet.len = int(self.entries[6].get())
         ip_packet.id = int(self.entries[7].get())
         ip_packet.flags = int(self.entries[8].get())
         ip_packet.frag = int(self.entries[9].get())
         ip_packet.ttl = int(self.entries[10].get())
         ip_packet.proto = int(self.entries[11].get())
         payload = self.entries[16].get()
         ip_packet.src = self.entries[13].get()
         ip_packet.dst = self.entries[14].get()
         # 不含payload计算首部校验和
         if payload == '':
             print("无payload的IP报文")
             ip_packet.show()
             checksum_scapy = IP(raw(ip_packet)).chksum
             # 自主计算验证IP首部检验和并进行填充
             print("scapy自动计算的IP首部检验和是:%04x (%s)" %
                   (checksum_scapy, str(checksum_scapy)))
             # 1.将IP首部和自动设置为0
             ip_packet.chksum = 0
             # 2.生成ip首部的数据字符串
             x = raw(ip_packet)
             ipString = "".join("%02x" % orb(x) for x in x)
             # 3.将ip首部的数据字符串转换成字节数组
             ipbytes = bytearray.fromhex(ipString)
             # 4.调用校验和计算函数计算校验和
             checksum_self = self.IP_headchecksum(ipbytes)
             # 5.进行校验和验证
             print("验证计算IP首部的检验和是:%04x (%s)" %
                   (checksum_self, str(checksum_self)))
         # 含payload计算首部校验和
         else:
             print("含有payload的IP报文")
             ip_packet = ip_packet / payload
             ip_packet.show()
             ip_packet.len = 20 + len(payload)
             checksum_scapy = IP(raw(ip_packet)).chksum
             print("scapy自动计算的IP首部检验和是:%04x (%s)" %
                   (checksum_scapy, str(checksum_scapy)))
             ip_packet.chksum = 0
             ip_packet.ihl = 5
             print('\n 报文长度是:%s' % str(ip_packet.len))
             x = raw(ip_packet)
             ipString = "".join("%02x" % orb(x) for x in x)
             ipbytes = bytearray.fromhex(ipString)
             checksum_self = self.IP_headchecksum(ipbytes[0:ip_packet.ihl *
                                                          4])
             print("验证计算IP首部的检验和是:%04x (%s)" %
                   (checksum_self, str(checksum_self)))
         if checksum_self == checksum_scapy:
             print("检验和正确")
         else:
             print("检验和不正确")
         ip_packet.chksum = checksum_self
         self.entries[12].delete(0, END)
         self.entries[12].insert(0, hex(ip_packet.chksum))
         ip_packet.show()
         self.resultText.insert('end', ip_packet.summary() + '\n')
         self.resultText.insert('end', str(ip_packet) + '\n')
         return eth / ip_packet
     except Exception as e:
         print(e.with_traceback())
     finally:
         pass