#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0

# Controls the openvswitch module.  Part of the kselftest suite, but
# can be used for some diagnostic purpose as well.

import argparse
import errno
import ipaddress
import logging
import multiprocessing
import struct
import sys
import time

try:
    from pyroute2 import NDB

    from pyroute2.netlink import NLA_F_NESTED
    from pyroute2.netlink import NLM_F_ACK
    from pyroute2.netlink import NLM_F_DUMP
    from pyroute2.netlink import NLM_F_REQUEST
    from pyroute2.netlink import genlmsg
    from pyroute2.netlink import nla
    from pyroute2.netlink import nlmsg_atoms
    from pyroute2.netlink.exceptions import NetlinkError
    from pyroute2.netlink.generic import GenericNetlinkSocket
    import pyroute2

except ModuleNotFoundError:
    print("Need to install the python pyroute2 package >= 0.6.")
    sys.exit(0)


OVS_DATAPATH_FAMILY = "ovs_datapath"
OVS_VPORT_FAMILY = "ovs_vport"
OVS_FLOW_FAMILY = "ovs_flow"
OVS_PACKET_FAMILY = "ovs_packet"
OVS_METER_FAMILY = "ovs_meter"
OVS_CT_LIMIT_FAMILY = "ovs_ct_limit"

OVS_DATAPATH_VERSION = 2
OVS_DP_CMD_NEW = 1
OVS_DP_CMD_DEL = 2
OVS_DP_CMD_GET = 3
OVS_DP_CMD_SET = 4

OVS_VPORT_CMD_NEW = 1
OVS_VPORT_CMD_DEL = 2
OVS_VPORT_CMD_GET = 3
OVS_VPORT_CMD_SET = 4

OVS_FLOW_CMD_NEW = 1
OVS_FLOW_CMD_DEL = 2
OVS_FLOW_CMD_GET = 3
OVS_FLOW_CMD_SET = 4


def macstr(mac):
    outstr = ":".join(["%02X" % i for i in mac])
    return outstr


def convert_mac(mac_str, mask=False):
    if mac_str is None or mac_str == "":
        mac_str = "00:00:00:00:00:00"
    if mask is True and mac_str != "00:00:00:00:00:00":
        mac_str = "FF:FF:FF:FF:FF:FF"
    mac_split = mac_str.split(":")
    ret = bytearray([int(i, 16) for i in mac_split])
    return bytes(ret)


def convert_ipv4(ip, mask=False):
    if ip is None:
        ip = 0
    if mask is True:
        if ip != 0:
            ip = int(ipaddress.IPv4Address(ip)) & 0xFFFFFFFF

    return int(ipaddress.IPv4Address(ip))


class ovs_dp_msg(genlmsg):
    # include the OVS version
    # We need a custom header rather than just being able to rely on
    # genlmsg because fields ends up not expressing everything correctly
    # if we use the canonical example of setting fields = (('customfield',),)
    fields = genlmsg.fields + (("dpifindex", "I"),)


class ovsactions(nla):
    nla_flags = NLA_F_NESTED

    nla_map = (
        ("OVS_ACTION_ATTR_UNSPEC", "none"),
        ("OVS_ACTION_ATTR_OUTPUT", "uint32"),
        ("OVS_ACTION_ATTR_USERSPACE", "userspace"),
        ("OVS_ACTION_ATTR_SET", "none"),
        ("OVS_ACTION_ATTR_PUSH_VLAN", "none"),
        ("OVS_ACTION_ATTR_POP_VLAN", "flag"),
        ("OVS_ACTION_ATTR_SAMPLE", "none"),
        ("OVS_ACTION_ATTR_RECIRC", "uint32"),
        ("OVS_ACTION_ATTR_HASH", "none"),
        ("OVS_ACTION_ATTR_PUSH_MPLS", "none"),
        ("OVS_ACTION_ATTR_POP_MPLS", "flag"),
        ("OVS_ACTION_ATTR_SET_MASKED", "none"),
        ("OVS_ACTION_ATTR_CT", "ctact"),
        ("OVS_ACTION_ATTR_TRUNC", "uint32"),
        ("OVS_ACTION_ATTR_PUSH_ETH", "none"),
        ("OVS_ACTION_ATTR_POP_ETH", "flag"),
        ("OVS_ACTION_ATTR_CT_CLEAR", "flag"),
        ("OVS_ACTION_ATTR_PUSH_NSH", "none"),
        ("OVS_ACTION_ATTR_POP_NSH", "flag"),
        ("OVS_ACTION_ATTR_METER", "none"),
        ("OVS_ACTION_ATTR_CLONE", "none"),
        ("OVS_ACTION_ATTR_CHECK_PKT_LEN", "none"),
        ("OVS_ACTION_ATTR_ADD_MPLS", "none"),
        ("OVS_ACTION_ATTR_DEC_TTL", "none"),
    )

    class ctact(nla):
        nla_flags = NLA_F_NESTED

        nla_map = (
            ("OVS_CT_ATTR_NONE", "none"),
            ("OVS_CT_ATTR_COMMIT", "flag"),
            ("OVS_CT_ATTR_ZONE", "uint16"),
            ("OVS_CT_ATTR_MARK", "none"),
            ("OVS_CT_ATTR_LABELS", "none"),
            ("OVS_CT_ATTR_HELPER", "asciiz"),
            ("OVS_CT_ATTR_NAT", "natattr"),
            ("OVS_CT_ATTR_FORCE_COMMIT", "flag"),
            ("OVS_CT_ATTR_EVENTMASK", "uint32"),
            ("OVS_CT_ATTR_TIMEOUT", "asciiz"),
        )

        class natattr(nla):
            nla_flags = NLA_F_NESTED

            nla_map = (
                ("OVS_NAT_ATTR_NONE", "none"),
                ("OVS_NAT_ATTR_SRC", "flag"),
                ("OVS_NAT_ATTR_DST", "flag"),
                ("OVS_NAT_ATTR_IP_MIN", "ipaddr"),
                ("OVS_NAT_ATTR_IP_MAX", "ipaddr"),
                ("OVS_NAT_ATTR_PROTO_MIN", "uint16"),
                ("OVS_NAT_ATTR_PROTO_MAX", "uint16"),
                ("OVS_NAT_ATTR_PERSISTENT", "flag"),
                ("OVS_NAT_ATTR_PROTO_HASH", "flag"),
                ("OVS_NAT_ATTR_PROTO_RANDOM", "flag"),
            )

            def dpstr(self, more=False):
                print_str = "nat("

                if self.get_attr("OVS_NAT_ATTR_SRC"):
                    print_str += "src"
                elif self.get_attr("OVS_NAT_ATTR_DST"):
                    print_str += "dst"
                else:
                    print_str += "XXX-unknown-nat"

                if self.get_attr("OVS_NAT_ATTR_IP_MIN") or self.get_attr(
                    "OVS_NAT_ATTR_IP_MAX"
                ):
                    if self.get_attr("OVS_NAT_ATTR_IP_MIN"):
                        print_str += "=%s," % str(
                            self.get_attr("OVS_NAT_ATTR_IP_MIN")
                        )

                    if self.get_attr("OVS_NAT_ATTR_IP_MAX"):
                        print_str += "-%s," % str(
                            self.get_attr("OVS_NAT_ATTR_IP_MAX")
                        )
                else:
                    print_str += ","

                if self.get_attr("OVS_NAT_ATTR_PROTO_MIN"):
                    print_str += "proto_min=%d," % self.get_attr(
                        "OVS_NAT_ATTR_PROTO_MIN"
                    )

                if self.get_attr("OVS_NAT_ATTR_PROTO_MAX"):
                    print_str += "proto_max=%d," % self.get_attr(
                        "OVS_NAT_ATTR_PROTO_MAX"
                    )

                if self.get_attr("OVS_NAT_ATTR_PERSISTENT"):
                    print_str += "persistent,"
                if self.get_attr("OVS_NAT_ATTR_HASH"):
                    print_str += "hash,"
                if self.get_attr("OVS_NAT_ATTR_RANDOM"):
                    print_str += "random"
                print_str += ")"
                return print_str

        def dpstr(self, more=False):
            print_str = "ct("

            if self.get_attr("OVS_CT_ATTR_COMMIT") is not None:
                print_str += "commit,"
            if self.get_attr("OVS_CT_ATTR_ZONE") is not None:
                print_str += "zone=%d," % self.get_attr("OVS_CT_ATTR_ZONE")
            if self.get_attr("OVS_CT_ATTR_HELPER") is not None:
                print_str += "helper=%s," % self.get_attr("OVS_CT_ATTR_HELPER")
            if self.get_attr("OVS_CT_ATTR_NAT") is not None:
                print_str += self.get_attr("OVS_CT_ATTR_NAT").dpstr(more)
                print_str += ","
            if self.get_attr("OVS_CT_ATTR_FORCE_COMMIT") is not None:
                print_str += "force,"
            if self.get_attr("OVS_CT_ATTR_EVENTMASK") is not None:
                print_str += "emask=0x%X," % self.get_attr(
                    "OVS_CT_ATTR_EVENTMASK"
                )
            if self.get_attr("OVS_CT_ATTR_TIMEOUT") is not None:
                print_str += "timeout=%s" % self.get_attr(
                    "OVS_CT_ATTR_TIMEOUT"
                )
            print_str += ")"
            return print_str

    class userspace(nla):
        nla_flags = NLA_F_NESTED

        nla_map = (
            ("OVS_USERSPACE_ATTR_UNUSED", "none"),
            ("OVS_USERSPACE_ATTR_PID", "uint32"),
            ("OVS_USERSPACE_ATTR_USERDATA", "array(uint8)"),
            ("OVS_USERSPACE_ATTR_EGRESS_TUN_PORT", "uint32"),
        )

        def dpstr(self, more=False):
            print_str = "userspace("
            if self.get_attr("OVS_USERSPACE_ATTR_PID") is not None:
                print_str += "pid=%d," % self.get_attr(
                    "OVS_USERSPACE_ATTR_PID"
                )
            if self.get_attr("OVS_USERSPACE_ATTR_USERDATA") is not None:
                print_str += "userdata="
                for f in self.get_attr("OVS_USERSPACE_ATTR_USERDATA"):
                    print_str += "%x." % f
            if self.get_attr("OVS_USERSPACE_ATTR_TUN_PORT") is not None:
                print_str += "egress_tun_port=%d" % self.get_attr(
                    "OVS_USERSPACE_ATTR_TUN_PORT"
                )
            print_str += ")"
            return print_str

    def dpstr(self, more=False):
        print_str = ""

        for field in self.nla_map:
            if field[1] == "none" or self.get_attr(field[0]) is None:
                continue
            if print_str != "":
                print_str += ","

            if field[1] == "uint32":
                if field[0] == "OVS_ACTION_ATTR_OUTPUT":
                    print_str += "%d" % int(self.get_attr(field[0]))
                elif field[0] == "OVS_ACTION_ATTR_RECIRC":
                    print_str += "recirc(0x%x)" % int(self.get_attr(field[0]))
                elif field[0] == "OVS_ACTION_ATTR_TRUNC":
                    print_str += "trunc(%d)" % int(self.get_attr(field[0]))
            elif field[1] == "flag":
                if field[0] == "OVS_ACTION_ATTR_CT_CLEAR":
                    print_str += "ct_clear"
                elif field[0] == "OVS_ACTION_ATTR_POP_VLAN":
                    print_str += "pop_vlan"
                elif field[0] == "OVS_ACTION_ATTR_POP_ETH":
                    print_str += "pop_eth"
                elif field[0] == "OVS_ACTION_ATTR_POP_NSH":
                    print_str += "pop_nsh"
                elif field[0] == "OVS_ACTION_ATTR_POP_MPLS":
                    print_str += "pop_mpls"
            else:
                datum = self.get_attr(field[0])
                print_str += datum.dpstr(more)

        return print_str


class ovskey(nla):
    nla_flags = NLA_F_NESTED
    nla_map = (
        ("OVS_KEY_ATTR_UNSPEC", "none"),
        ("OVS_KEY_ATTR_ENCAP", "none"),
        ("OVS_KEY_ATTR_PRIORITY", "uint32"),
        ("OVS_KEY_ATTR_IN_PORT", "uint32"),
        ("OVS_KEY_ATTR_ETHERNET", "ethaddr"),
        ("OVS_KEY_ATTR_VLAN", "uint16"),
        ("OVS_KEY_ATTR_ETHERTYPE", "be16"),
        ("OVS_KEY_ATTR_IPV4", "ovs_key_ipv4"),
        ("OVS_KEY_ATTR_IPV6", "ovs_key_ipv6"),
        ("OVS_KEY_ATTR_TCP", "ovs_key_tcp"),
        ("OVS_KEY_ATTR_UDP", "ovs_key_udp"),
        ("OVS_KEY_ATTR_ICMP", "ovs_key_icmp"),
        ("OVS_KEY_ATTR_ICMPV6", "ovs_key_icmpv6"),
        ("OVS_KEY_ATTR_ARP", "ovs_key_arp"),
        ("OVS_KEY_ATTR_ND", "ovs_key_nd"),
        ("OVS_KEY_ATTR_SKB_MARK", "uint32"),
        ("OVS_KEY_ATTR_TUNNEL", "none"),
        ("OVS_KEY_ATTR_SCTP", "ovs_key_sctp"),
        ("OVS_KEY_ATTR_TCP_FLAGS", "be16"),
        ("OVS_KEY_ATTR_DP_HASH", "uint32"),
        ("OVS_KEY_ATTR_RECIRC_ID", "uint32"),
        ("OVS_KEY_ATTR_MPLS", "array(ovs_key_mpls)"),
        ("OVS_KEY_ATTR_CT_STATE", "uint32"),
        ("OVS_KEY_ATTR_CT_ZONE", "uint16"),
        ("OVS_KEY_ATTR_CT_MARK", "uint32"),
        ("OVS_KEY_ATTR_CT_LABELS", "none"),
        ("OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4", "ovs_key_ct_tuple_ipv4"),
        ("OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6", "ovs_key_ct_tuple_ipv6"),
        ("OVS_KEY_ATTR_NSH", "none"),
        ("OVS_KEY_ATTR_PACKET_TYPE", "none"),
        ("OVS_KEY_ATTR_ND_EXTENSIONS", "none"),
        ("OVS_KEY_ATTR_TUNNEL_INFO", "none"),
        ("OVS_KEY_ATTR_IPV6_EXTENSIONS", "none"),
    )

    class ovs_key_proto(nla):
        fields = (
            ("src", "!H"),
            ("dst", "!H"),
        )

        fields_map = (
            ("src", "src", "%d", lambda x: int(x) if x is not None else 0),
            ("dst", "dst", "%d", lambda x: int(x) if x is not None else 0),
        )

        def __init__(
            self,
            protostr,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            self.proto_str = protostr
            nla.__init__(
                self,
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

        def dpstr(self, masked=None, more=False):
            outstr = self.proto_str + "("
            first = False
            for f in self.fields_map:
                if first:
                    outstr += ","
                if masked is None:
                    outstr += "%s=" % f[0]
                    if isinstance(f[2], str):
                        outstr += f[2] % self[f[1]]
                    else:
                        outstr += f[2](self[f[1]])
                    first = True
                elif more or f[3](masked[f[1]]) != 0:
                    outstr += "%s=" % f[0]
                    if isinstance(f[2], str):
                        outstr += f[2] % self[f[1]]
                    else:
                        outstr += f[2](self[f[1]])
                    outstr += "/"
                    if isinstance(f[2], str):
                        outstr += f[2] % masked[f[1]]
                    else:
                        outstr += f[2](masked[f[1]])
                    first = True
            outstr += ")"
            return outstr

    class ethaddr(ovs_key_proto):
        fields = (
            ("src", "!6s"),
            ("dst", "!6s"),
        )

        fields_map = (
            (
                "src",
                "src",
                macstr,
                lambda x: int.from_bytes(x, "big"),
                convert_mac,
            ),
            (
                "dst",
                "dst",
                macstr,
                lambda x: int.from_bytes(x, "big"),
                convert_mac,
            ),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "eth",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_ipv4(ovs_key_proto):
        fields = (
            ("src", "!I"),
            ("dst", "!I"),
            ("proto", "B"),
            ("tos", "B"),
            ("ttl", "B"),
            ("frag", "B"),
        )

        fields_map = (
            (
                "src",
                "src",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            (
                "dst",
                "dst",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            ("proto", "proto", "%d", lambda x: int(x) if x is not None else 0),
            ("tos", "tos", "%d", lambda x: int(x) if x is not None else 0),
            ("ttl", "ttl", "%d", lambda x: int(x) if x is not None else 0),
            ("frag", "frag", "%d", lambda x: int(x) if x is not None else 0),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "ipv4",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_ipv6(ovs_key_proto):
        fields = (
            ("src", "!16s"),
            ("dst", "!16s"),
            ("label", "!I"),
            ("proto", "B"),
            ("tclass", "B"),
            ("hlimit", "B"),
            ("frag", "B"),
        )

        fields_map = (
            (
                "src",
                "src",
                lambda x: str(ipaddress.IPv6Address(x)),
                lambda x: int.from_bytes(x, "big"),
                lambda x: ipaddress.IPv6Address(x),
            ),
            (
                "dst",
                "dst",
                lambda x: str(ipaddress.IPv6Address(x)),
                lambda x: int.from_bytes(x, "big"),
                lambda x: ipaddress.IPv6Address(x),
            ),
            ("label", "label", "%d", int),
            ("proto", "proto", "%d", int),
            ("tclass", "tclass", "%d", int),
            ("hlimit", "hlimit", "%d", int),
            ("frag", "frag", "%d", int),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "ipv6",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_tcp(ovs_key_proto):
        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "tcp",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_udp(ovs_key_proto):
        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "udp",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_sctp(ovs_key_proto):
        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "sctp",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_icmp(ovs_key_proto):
        fields = (
            ("type", "B"),
            ("code", "B"),
        )

        fields_map = (
            ("type", "type", "%d", int),
            ("code", "code", "%d", int),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "icmp",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_icmpv6(ovs_key_icmp):
        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "icmpv6",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_arp(ovs_key_proto):
        fields = (
            ("sip", "!I"),
            ("tip", "!I"),
            ("op", "!H"),
            ("sha", "!6s"),
            ("tha", "!6s"),
            ("pad", "xx"),
        )

        fields_map = (
            (
                "sip",
                "sip",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            (
                "tip",
                "tip",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            ("op", "op", "%d", lambda x: int(x) if x is not None else 0),
            (
                "sha",
                "sha",
                macstr,
                lambda x: int.from_bytes(x, "big"),
                convert_mac,
            ),
            (
                "tha",
                "tha",
                macstr,
                lambda x: int.from_bytes(x, "big"),
                convert_mac,
            ),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "arp",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_nd(ovs_key_proto):
        fields = (
            ("target", "!16s"),
            ("sll", "!6s"),
            ("tll", "!6s"),
        )

        fields_map = (
            (
                "target",
                "target",
                lambda x: str(ipaddress.IPv6Address(x)),
                lambda x: int.from_bytes(x, "big"),
            ),
            ("sll", "sll", macstr, lambda x: int.from_bytes(x, "big")),
            ("tll", "tll", macstr, lambda x: int.from_bytes(x, "big")),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "nd",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_ct_tuple_ipv4(ovs_key_proto):
        fields = (
            ("src", "!I"),
            ("dst", "!I"),
            ("tp_src", "!H"),
            ("tp_dst", "!H"),
            ("proto", "B"),
        )

        fields_map = (
            (
                "src",
                "src",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            (
                "dst",
                "dst",
                lambda x: str(ipaddress.IPv4Address(x)),
                int,
                convert_ipv4,
            ),
            ("tp_src", "tp_src", "%d", int),
            ("tp_dst", "tp_dst", "%d", int),
            ("proto", "proto", "%d", int),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "ct_tuple4",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_ct_tuple_ipv6(nla):
        fields = (
            ("src", "!16s"),
            ("dst", "!16s"),
            ("tp_src", "!H"),
            ("tp_dst", "!H"),
            ("proto", "B"),
        )

        fields_map = (
            (
                "src",
                "src",
                lambda x: str(ipaddress.IPv6Address(x)),
                lambda x: int.from_bytes(x, "big", convertmac),
            ),
            (
                "dst",
                "dst",
                lambda x: str(ipaddress.IPv6Address(x)),
                lambda x: int.from_bytes(x, "big"),
            ),
            ("tp_src", "tp_src", "%d", int),
            ("tp_dst", "tp_dst", "%d", int),
            ("proto", "proto", "%d", int),
        )

        def __init__(
            self,
            data=None,
            offset=None,
            parent=None,
            length=None,
            init=None,
        ):
            ovskey.ovs_key_proto.__init__(
                self,
                "ct_tuple6",
                data=data,
                offset=offset,
                parent=parent,
                length=length,
                init=init,
            )

    class ovs_key_mpls(nla):
        fields = (("lse", ">I"),)

    def dpstr(self, mask=None, more=False):
        print_str = ""

        for field in (
            (
                "OVS_KEY_ATTR_PRIORITY",
                "skb_priority",
                "%d",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_SKB_MARK",
                "skb_mark",
                "%d",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_RECIRC_ID",
                "recirc_id",
                "0x%08X",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_DP_HASH",
                "dp_hash",
                "0x%08X",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_CT_STATE",
                "ct_state",
                "0x%04x",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_CT_ZONE",
                "ct_zone",
                "0x%04x",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_CT_MARK",
                "ct_mark",
                "0x%08x",
                lambda x: False,
                True,
            ),
            (
                "OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4",
                None,
                None,
                False,
                False,
            ),
            (
                "OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6",
                None,
                None,
                False,
                False,
            ),
            (
                "OVS_KEY_ATTR_IN_PORT",
                "in_port",
                "%d",
                lambda x: True,
                True,
            ),
            ("OVS_KEY_ATTR_ETHERNET", None, None, False, False),
            (
                "OVS_KEY_ATTR_ETHERTYPE",
                "eth_type",
                "0x%04x",
                lambda x: int(x) == 0xFFFF,
                True,
            ),
            ("OVS_KEY_ATTR_IPV4", None, None, False, False),
            ("OVS_KEY_ATTR_IPV6", None, None, False, False),
            ("OVS_KEY_ATTR_ARP", None, None, False, False),
            ("OVS_KEY_ATTR_TCP", None, None, False, False),
            (
                "OVS_KEY_ATTR_TCP_FLAGS",
                "tcp_flags",
                "0x%04x",
                lambda x: False,
                True,
            ),
            ("OVS_KEY_ATTR_UDP", None, None, False, False),
            ("OVS_KEY_ATTR_SCTP", None, None, False, False),
            ("OVS_KEY_ATTR_ICMP", None, None, False, False),
            ("OVS_KEY_ATTR_ICMPV6", None, None, False, False),
            ("OVS_KEY_ATTR_ND", None, None, False, False),
        ):
            v = self.get_attr(field[0])
            if v is not None:
                m = None if mask is None else mask.get_attr(field[0])
                if field[4] is False:
                    print_str += v.dpstr(m, more)
                    print_str += ","
                else:
                    if m is None or field[3](m):
                        print_str += field[1] + "("
                        print_str += field[2] % v
                        print_str += "),"
                    elif more or m != 0:
                        print_str += field[1] + "("
                        print_str += (field[2] % v) + "/" + (field[2] % m)
                        print_str += "),"

        return print_str


class OvsPacket(GenericNetlinkSocket):
    OVS_PACKET_CMD_MISS = 1  # Flow table miss
    OVS_PACKET_CMD_ACTION = 2  # USERSPACE action
    OVS_PACKET_CMD_EXECUTE = 3  # Apply actions to packet

    class ovs_packet_msg(ovs_dp_msg):
        nla_map = (
            ("OVS_PACKET_ATTR_UNSPEC", "none"),
            ("OVS_PACKET_ATTR_PACKET", "array(uint8)"),
            ("OVS_PACKET_ATTR_KEY", "ovskey"),
            ("OVS_PACKET_ATTR_ACTIONS", "ovsactions"),
            ("OVS_PACKET_ATTR_USERDATA", "none"),
            ("OVS_PACKET_ATTR_EGRESS_TUN_KEY", "none"),
            ("OVS_PACKET_ATTR_UNUSED1", "none"),
            ("OVS_PACKET_ATTR_UNUSED2", "none"),
            ("OVS_PACKET_ATTR_PROBE", "none"),
            ("OVS_PACKET_ATTR_MRU", "uint16"),
            ("OVS_PACKET_ATTR_LEN", "uint32"),
            ("OVS_PACKET_ATTR_HASH", "uint64"),
        )

    def __init__(self):
        GenericNetlinkSocket.__init__(self)
        self.bind(OVS_PACKET_FAMILY, OvsPacket.ovs_packet_msg)

    def upcall_handler(self, up=None):
        print("listening on upcall packet handler:", self.epid)
        while True:
            try:
                msgs = self.get()
                for msg in msgs:
                    if not up:
                        continue
                    if msg["cmd"] == OvsPacket.OVS_PACKET_CMD_MISS:
                        up.miss(msg)
                    elif msg["cmd"] == OvsPacket.OVS_PACKET_CMD_ACTION:
                        up.action(msg)
                    elif msg["cmd"] == OvsPacket.OVS_PACKET_CMD_EXECUTE:
                        up.execute(msg)
                    else:
                        print("Unkonwn cmd: %d" % msg["cmd"])
            except NetlinkError as ne:
                raise ne


class OvsDatapath(GenericNetlinkSocket):
    OVS_DP_F_VPORT_PIDS = 1 << 1
    OVS_DP_F_DISPATCH_UPCALL_PER_CPU = 1 << 3

    class dp_cmd_msg(ovs_dp_msg):
        """
        Message class that will be used to communicate with the kernel module.
        """

        nla_map = (
            ("OVS_DP_ATTR_UNSPEC", "none"),
            ("OVS_DP_ATTR_NAME", "asciiz"),
            ("OVS_DP_ATTR_UPCALL_PID", "array(uint32)"),
            ("OVS_DP_ATTR_STATS", "dpstats"),
            ("OVS_DP_ATTR_MEGAFLOW_STATS", "megaflowstats"),
            ("OVS_DP_ATTR_USER_FEATURES", "uint32"),
            ("OVS_DP_ATTR_PAD", "none"),
            ("OVS_DP_ATTR_MASKS_CACHE_SIZE", "uint32"),
            ("OVS_DP_ATTR_PER_CPU_PIDS", "array(uint32)"),
        )

        class dpstats(nla):
            fields = (
                ("hit", "=Q"),
                ("missed", "=Q"),
                ("lost", "=Q"),
                ("flows", "=Q"),
            )

        class megaflowstats(nla):
            fields = (
                ("mask_hit", "=Q"),
                ("masks", "=I"),
                ("padding", "=I"),
                ("cache_hits", "=Q"),
                ("pad1", "=Q"),
            )

    def __init__(self):
        GenericNetlinkSocket.__init__(self)
        self.bind(OVS_DATAPATH_FAMILY, OvsDatapath.dp_cmd_msg)

    def info(self, dpname, ifindex=0):
        msg = OvsDatapath.dp_cmd_msg()
        msg["cmd"] = OVS_DP_CMD_GET
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = ifindex
        msg["attrs"].append(["OVS_DP_ATTR_NAME", dpname])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.ENODEV:
                reply = None
            else:
                raise ne

        return reply

    def create(
        self, dpname, shouldUpcall=False, versionStr=None, p=OvsPacket()
    ):
        msg = OvsDatapath.dp_cmd_msg()
        msg["cmd"] = OVS_DP_CMD_NEW
        if versionStr is None:
            msg["version"] = OVS_DATAPATH_VERSION
        else:
            msg["version"] = int(versionStr.split(":")[0], 0)
        msg["reserved"] = 0
        msg["dpifindex"] = 0
        msg["attrs"].append(["OVS_DP_ATTR_NAME", dpname])

        dpfeatures = 0
        if versionStr is not None and versionStr.find(":") != -1:
            dpfeatures = int(versionStr.split(":")[1], 0)
        else:
            if versionStr is None or versionStr.find(":") == -1:
                dpfeatures |= OvsDatapath.OVS_DP_F_DISPATCH_UPCALL_PER_CPU
                dpfeatures &= ~OvsDatapath.OVS_DP_F_VPORT_PIDS

            nproc = multiprocessing.cpu_count()
            procarray = []
            for i in range(1, nproc):
                procarray += [int(p.epid)]
            msg["attrs"].append(["OVS_DP_ATTR_UPCALL_PID", procarray])
        msg["attrs"].append(["OVS_DP_ATTR_USER_FEATURES", dpfeatures])
        if not shouldUpcall:
            msg["attrs"].append(["OVS_DP_ATTR_UPCALL_PID", [0]])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.EEXIST:
                reply = None
            else:
                raise ne

        return reply

    def destroy(self, dpname):
        msg = OvsDatapath.dp_cmd_msg()
        msg["cmd"] = OVS_DP_CMD_DEL
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = 0
        msg["attrs"].append(["OVS_DP_ATTR_NAME", dpname])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.ENODEV:
                reply = None
            else:
                raise ne

        return reply


class OvsVport(GenericNetlinkSocket):
    OVS_VPORT_TYPE_NETDEV = 1
    OVS_VPORT_TYPE_INTERNAL = 2
    OVS_VPORT_TYPE_GRE = 3
    OVS_VPORT_TYPE_VXLAN = 4
    OVS_VPORT_TYPE_GENEVE = 5

    class ovs_vport_msg(ovs_dp_msg):
        nla_map = (
            ("OVS_VPORT_ATTR_UNSPEC", "none"),
            ("OVS_VPORT_ATTR_PORT_NO", "uint32"),
            ("OVS_VPORT_ATTR_TYPE", "uint32"),
            ("OVS_VPORT_ATTR_NAME", "asciiz"),
            ("OVS_VPORT_ATTR_OPTIONS", "none"),
            ("OVS_VPORT_ATTR_UPCALL_PID", "array(uint32)"),
            ("OVS_VPORT_ATTR_STATS", "vportstats"),
            ("OVS_VPORT_ATTR_PAD", "none"),
            ("OVS_VPORT_ATTR_IFINDEX", "uint32"),
            ("OVS_VPORT_ATTR_NETNSID", "uint32"),
        )

        class vportstats(nla):
            fields = (
                ("rx_packets", "=Q"),
                ("tx_packets", "=Q"),
                ("rx_bytes", "=Q"),
                ("tx_bytes", "=Q"),
                ("rx_errors", "=Q"),
                ("tx_errors", "=Q"),
                ("rx_dropped", "=Q"),
                ("tx_dropped", "=Q"),
            )

    def type_to_str(vport_type):
        if vport_type == OvsVport.OVS_VPORT_TYPE_NETDEV:
            return "netdev"
        elif vport_type == OvsVport.OVS_VPORT_TYPE_INTERNAL:
            return "internal"
        elif vport_type == OvsVport.OVS_VPORT_TYPE_GRE:
            return "gre"
        elif vport_type == OvsVport.OVS_VPORT_TYPE_VXLAN:
            return "vxlan"
        elif vport_type == OvsVport.OVS_VPORT_TYPE_GENEVE:
            return "geneve"
        raise ValueError("Unknown vport type:%d" % vport_type)

    def str_to_type(vport_type):
        if vport_type == "netdev":
            return OvsVport.OVS_VPORT_TYPE_NETDEV
        elif vport_type == "internal":
            return OvsVport.OVS_VPORT_TYPE_INTERNAL
        elif vport_type == "gre":
            return OvsVport.OVS_VPORT_TYPE_INTERNAL
        elif vport_type == "vxlan":
            return OvsVport.OVS_VPORT_TYPE_VXLAN
        elif vport_type == "geneve":
            return OvsVport.OVS_VPORT_TYPE_GENEVE
        raise ValueError("Unknown vport type: '%s'" % vport_type)

    def __init__(self, packet=OvsPacket()):
        GenericNetlinkSocket.__init__(self)
        self.bind(OVS_VPORT_FAMILY, OvsVport.ovs_vport_msg)
        self.upcall_packet = packet

    def info(self, vport_name, dpifindex=0, portno=None):
        msg = OvsVport.ovs_vport_msg()

        msg["cmd"] = OVS_VPORT_CMD_GET
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = dpifindex

        if portno is None:
            msg["attrs"].append(["OVS_VPORT_ATTR_NAME", vport_name])
        else:
            msg["attrs"].append(["OVS_VPORT_ATTR_PORT_NO", portno])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.ENODEV:
                reply = None
            else:
                raise ne
        return reply

    def attach(self, dpindex, vport_ifname, ptype):
        msg = OvsVport.ovs_vport_msg()

        msg["cmd"] = OVS_VPORT_CMD_NEW
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = dpindex
        port_type = OvsVport.str_to_type(ptype)

        msg["attrs"].append(["OVS_VPORT_ATTR_TYPE", port_type])
        msg["attrs"].append(["OVS_VPORT_ATTR_NAME", vport_ifname])
        msg["attrs"].append(
            ["OVS_VPORT_ATTR_UPCALL_PID", [self.upcall_packet.epid]]
        )

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.EEXIST:
                reply = None
            else:
                raise ne
        return reply

    def reset_upcall(self, dpindex, vport_ifname, p=None):
        msg = OvsVport.ovs_vport_msg()

        msg["cmd"] = OVS_VPORT_CMD_SET
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = dpindex
        msg["attrs"].append(["OVS_VPORT_ATTR_NAME", vport_ifname])

        if p == None:
            p = self.upcall_packet
        else:
            self.upcall_packet = p

        msg["attrs"].append(["OVS_VPORT_ATTR_UPCALL_PID", [p.epid]])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
            )
            reply = reply[0]
        except NetlinkError as ne:
            raise ne
        return reply

    def detach(self, dpindex, vport_ifname):
        msg = OvsVport.ovs_vport_msg()

        msg["cmd"] = OVS_VPORT_CMD_DEL
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = dpindex
        msg["attrs"].append(["OVS_VPORT_ATTR_NAME", vport_ifname])

        try:
            reply = self.nlm_request(
                msg, msg_type=self.prid, msg_flags=NLM_F_REQUEST | NLM_F_ACK
            )
            reply = reply[0]
        except NetlinkError as ne:
            if ne.code == errno.ENODEV:
                reply = None
            else:
                raise ne
        return reply

    def upcall_handler(self, handler=None):
        self.upcall_packet.upcall_handler(handler)


class OvsFlow(GenericNetlinkSocket):
    class ovs_flow_msg(ovs_dp_msg):
        nla_map = (
            ("OVS_FLOW_ATTR_UNSPEC", "none"),
            ("OVS_FLOW_ATTR_KEY", "ovskey"),
            ("OVS_FLOW_ATTR_ACTIONS", "ovsactions"),
            ("OVS_FLOW_ATTR_STATS", "flowstats"),
            ("OVS_FLOW_ATTR_TCP_FLAGS", "uint8"),
            ("OVS_FLOW_ATTR_USED", "uint64"),
            ("OVS_FLOW_ATTR_CLEAR", "none"),
            ("OVS_FLOW_ATTR_MASK", "ovskey"),
            ("OVS_FLOW_ATTR_PROBE", "none"),
            ("OVS_FLOW_ATTR_UFID", "array(uint32)"),
            ("OVS_FLOW_ATTR_UFID_FLAGS", "uint32"),
        )

        class flowstats(nla):
            fields = (
                ("packets", "=Q"),
                ("bytes", "=Q"),
            )

        def dpstr(self, more=False):
            ufid = self.get_attr("OVS_FLOW_ATTR_UFID")
            ufid_str = ""
            if ufid is not None:
                ufid_str = (
                    "ufid:{:08x}-{:04x}-{:04x}-{:04x}-{:04x}{:08x}".format(
                        ufid[0],
                        ufid[1] >> 16,
                        ufid[1] & 0xFFFF,
                        ufid[2] >> 16,
                        ufid[2] & 0,
                        ufid[3],
                    )
                )

            key_field = self.get_attr("OVS_FLOW_ATTR_KEY")
            keymsg = None
            if key_field is not None:
                keymsg = key_field

            mask_field = self.get_attr("OVS_FLOW_ATTR_MASK")
            maskmsg = None
            if mask_field is not None:
                maskmsg = mask_field

            acts_field = self.get_attr("OVS_FLOW_ATTR_ACTIONS")
            actsmsg = None
            if acts_field is not None:
                actsmsg = acts_field

            print_str = ""

            if more:
                print_str += ufid_str + ","

            if keymsg is not None:
                print_str += keymsg.dpstr(maskmsg, more)

            stats = self.get_attr("OVS_FLOW_ATTR_STATS")
            if stats is None:
                print_str += " packets:0, bytes:0,"
            else:
                print_str += " packets:%d, bytes:%d," % (
                    stats["packets"],
                    stats["bytes"],
                )

            used = self.get_attr("OVS_FLOW_ATTR_USED")
            print_str += " used:"
            if used is None:
                print_str += "never,"
            else:
                used_time = int(used)
                cur_time_sec = time.clock_gettime(time.CLOCK_MONOTONIC)
                used_time = (cur_time_sec * 1000) - used_time
                print_str += "{}s,".format(used_time / 1000)

            print_str += " actions:"
            if (
                actsmsg is None
                or "attrs" not in actsmsg
                or len(actsmsg["attrs"]) == 0
            ):
                print_str += "drop"
            else:
                print_str += actsmsg.dpstr(more)

            return print_str

    def __init__(self):
        GenericNetlinkSocket.__init__(self)

        self.bind(OVS_FLOW_FAMILY, OvsFlow.ovs_flow_msg)

    def dump(self, dpifindex, flowspec=None):
        """
        Returns a list of messages containing flows.

        dpifindex should be a valid datapath obtained by calling
        into the OvsDatapath lookup

        flowpsec is a string which represents a flow in the dpctl
        format.
        """
        msg = OvsFlow.ovs_flow_msg()

        msg["cmd"] = OVS_FLOW_CMD_GET
        msg["version"] = OVS_DATAPATH_VERSION
        msg["reserved"] = 0
        msg["dpifindex"] = dpifindex

        msg_flags = NLM_F_REQUEST | NLM_F_ACK
        if flowspec is None:
            msg_flags |= NLM_F_DUMP
        rep = None

        try:
            rep = self.nlm_request(
                msg,
                msg_type=self.prid,
                msg_flags=msg_flags,
            )
        except NetlinkError as ne:
            raise ne
        return rep

    def miss(self, packetmsg):
        seq = packetmsg["header"]["sequence_number"]
        keystr = "(none)"
        key_field = packetmsg.get_attr("OVS_PACKET_ATTR_KEY")
        if key_field is not None:
            keystr = key_field.dpstr(None, True)

        pktdata = packetmsg.get_attr("OVS_PACKET_ATTR_PACKET")
        pktpres = "yes" if pktdata is not None else "no"

        print("MISS upcall[%d/%s]: %s" % (seq, pktpres, keystr), flush=True)

    def execute(self, packetmsg):
        print("userspace execute command")

    def action(self, packetmsg):
        print("userspace action command")


def print_ovsdp_full(dp_lookup_rep, ifindex, ndb=NDB(), vpl=OvsVport()):
    dp_name = dp_lookup_rep.get_attr("OVS_DP_ATTR_NAME")
    base_stats = dp_lookup_rep.get_attr("OVS_DP_ATTR_STATS")
    megaflow_stats = dp_lookup_rep.get_attr("OVS_DP_ATTR_MEGAFLOW_STATS")
    user_features = dp_lookup_rep.get_attr("OVS_DP_ATTR_USER_FEATURES")
    masks_cache_size = dp_lookup_rep.get_attr("OVS_DP_ATTR_MASKS_CACHE_SIZE")

    print("%s:" % dp_name)
    print(
        "  lookups: hit:%d missed:%d lost:%d"
        % (base_stats["hit"], base_stats["missed"], base_stats["lost"])
    )
    print("  flows:%d" % base_stats["flows"])
    pkts = base_stats["hit"] + base_stats["missed"]
    avg = (megaflow_stats["mask_hit"] / pkts) if pkts != 0 else 0.0
    print(
        "  masks: hit:%d total:%d hit/pkt:%f"
        % (megaflow_stats["mask_hit"], megaflow_stats["masks"], avg)
    )
    print("  caches:")
    print("    masks-cache: size:%d" % masks_cache_size)

    if user_features is not None:
        print("  features: 0x%X" % user_features)

    # port print out
    for iface in ndb.interfaces:
        rep = vpl.info(iface.ifname, ifindex)
        if rep is not None:
            print(
                "  port %d: %s (%s)"
                % (
                    rep.get_attr("OVS_VPORT_ATTR_PORT_NO"),
                    rep.get_attr("OVS_VPORT_ATTR_NAME"),
                    OvsVport.type_to_str(rep.get_attr("OVS_VPORT_ATTR_TYPE")),
                )
            )


def main(argv):
    nlmsg_atoms.ovskey = ovskey
    nlmsg_atoms.ovsactions = ovsactions

    # version check for pyroute2
    prverscheck = pyroute2.__version__.split(".")
    if int(prverscheck[0]) == 0 and int(prverscheck[1]) < 6:
        print("Need to upgrade the python pyroute2 package to >= 0.6.")
        sys.exit(0)

    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-v",
        "--verbose",
        action="count",
        help="Increment 'verbose' output counter.",
        default=0,
    )
    subparsers = parser.add_subparsers()

    showdpcmd = subparsers.add_parser("show")
    showdpcmd.add_argument(
        "showdp", metavar="N", type=str, nargs="?", help="Datapath Name"
    )

    adddpcmd = subparsers.add_parser("add-dp")
    adddpcmd.add_argument("adddp", help="Datapath Name")
    adddpcmd.add_argument(
        "-u",
        "--upcall",
        action="store_true",
        help="Leave open a reader for upcalls",
    )
    adddpcmd.add_argument(
        "-V",
        "--versioning",
        required=False,
        help="Specify a custom version / feature string",
    )

    deldpcmd = subparsers.add_parser("del-dp")
    deldpcmd.add_argument("deldp", help="Datapath Name")

    addifcmd = subparsers.add_parser("add-if")
    addifcmd.add_argument("dpname", help="Datapath Name")
    addifcmd.add_argument("addif", help="Interface name for adding")
    addifcmd.add_argument(
        "-u",
        "--upcall",
        action="store_true",
        help="Leave open a reader for upcalls",
    )
    addifcmd.add_argument(
        "-t",
        "--ptype",
        type=str,
        default="netdev",
        choices=["netdev", "internal"],
        help="Interface type (default netdev)",
    )
    delifcmd = subparsers.add_parser("del-if")
    delifcmd.add_argument("dpname", help="Datapath Name")
    delifcmd.add_argument("delif", help="Interface name for adding")

    dumpflcmd = subparsers.add_parser("dump-flows")
    dumpflcmd.add_argument("dumpdp", help="Datapath Name")

    args = parser.parse_args()

    if args.verbose > 0:
        if args.verbose > 1:
            logging.basicConfig(level=logging.DEBUG)

    ovspk = OvsPacket()
    ovsdp = OvsDatapath()
    ovsvp = OvsVport(ovspk)
    ovsflow = OvsFlow()
    ndb = NDB()

    if hasattr(args, "showdp"):
        found = False
        for iface in ndb.interfaces:
            rep = None
            if args.showdp is None:
                rep = ovsdp.info(iface.ifname, 0)
            elif args.showdp == iface.ifname:
                rep = ovsdp.info(iface.ifname, 0)

            if rep is not None:
                found = True
                print_ovsdp_full(rep, iface.index, ndb, ovsvp)

        if not found:
            msg = "No DP found"
            if args.showdp is not None:
                msg += ":'%s'" % args.showdp
            print(msg)
    elif hasattr(args, "adddp"):
        rep = ovsdp.create(args.adddp, args.upcall, args.versioning, ovspk)
        if rep is None:
            print("DP '%s' already exists" % args.adddp)
        else:
            print("DP '%s' added" % args.adddp)
        if args.upcall:
            ovspk.upcall_handler(ovsflow)
    elif hasattr(args, "deldp"):
        ovsdp.destroy(args.deldp)
    elif hasattr(args, "addif"):
        rep = ovsdp.info(args.dpname, 0)
        if rep is None:
            print("DP '%s' not found." % args.dpname)
            return 1
        dpindex = rep["dpifindex"]
        rep = ovsvp.attach(rep["dpifindex"], args.addif, args.ptype)
        msg = "vport '%s'" % args.addif
        if rep and rep["header"]["error"] is None:
            msg += " added."
        else:
            msg += " failed to add."
        if args.upcall:
            if rep is None:
                rep = ovsvp.reset_upcall(dpindex, args.addif, ovspk)
            ovsvp.upcall_handler(ovsflow)
    elif hasattr(args, "delif"):
        rep = ovsdp.info(args.dpname, 0)
        if rep is None:
            print("DP '%s' not found." % args.dpname)
            return 1
        rep = ovsvp.detach(rep["dpifindex"], args.delif)
        msg = "vport '%s'" % args.delif
        if rep and rep["header"]["error"] is None:
            msg += " removed."
        else:
            msg += " failed to remove."
    elif hasattr(args, "dumpdp"):
        rep = ovsdp.info(args.dumpdp, 0)
        if rep is None:
            print("DP '%s' not found." % args.dumpdp)
            return 1
        rep = ovsflow.dump(rep["dpifindex"])
        for flow in rep:
            print(flow.dpstr(True if args.verbose > 0 else False))

    return 0


if __name__ == "__main__":
    sys.exit(main(sys.argv))