netbox/netbox/ipam/filtersets.py

import django_filters
import netaddr
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ValidationError
from django.db.models import Q
from django.utils.translation import gettext as _
from drf_spectacular.types import OpenApiTypes
from drf_spectacular.utils import extend_schema_field
from netaddr.core import AddrFormatError

from circuits.models import Provider
from dcim.base_filtersets import ScopedFilterSet
from dcim.models import Device, Interface, Region, Site, SiteGroup
from netbox.filtersets import (
    ChangeLoggedModelFilterSet, OrganizationalModelFilterSet, NetBoxModelFilterSet, PrimaryModelFilterSet,
)
from tenancy.filtersets import ContactModelFilterSet, TenancyFilterSet
from utilities.filters import (
    ContentTypeFilter, MultiValueCharFilter, MultiValueNumberFilter, NumericArrayFilter, TreeNodeMultipleChoiceFilter,
)
from utilities.filtersets import register_filterset
from virtualization.models import VirtualMachine, VMInterface
from vpn.models import L2VPN
from .choices import *
from .models import *

__all__ = (
    'AggregateFilterSet',
    'ASNFilterSet',
    'ASNRangeFilterSet',
    'FHRPGroupAssignmentFilterSet',
    'FHRPGroupFilterSet',
    'IPAddressFilterSet',
    'IPRangeFilterSet',
    'PrefixFilterSet',
    'PrimaryIPFilterSet',
    'RIRFilterSet',
    'RoleFilterSet',
    'RouteTargetFilterSet',
    'ServiceFilterSet',
    'ServiceTemplateFilterSet',
    'VLANFilterSet',
    'VLANGroupFilterSet',
    'VLANTranslationPolicyFilterSet',
    'VLANTranslationRuleFilterSet',
    'VRFFilterSet',
)


@register_filterset
class VRFFilterSet(PrimaryModelFilterSet, TenancyFilterSet):
    import_target_id = django_filters.ModelMultipleChoiceFilter(
        field_name='import_targets',
        queryset=RouteTarget.objects.all(),
        label=_('Import target'),
    )
    import_target = django_filters.ModelMultipleChoiceFilter(
        field_name='import_targets__name',
        queryset=RouteTarget.objects.all(),
        to_field_name='name',
        label=_('Import target (name)'),
    )
    export_target_id = django_filters.ModelMultipleChoiceFilter(
        field_name='export_targets',
        queryset=RouteTarget.objects.all(),
        label=_('Export target'),
    )
    export_target = django_filters.ModelMultipleChoiceFilter(
        field_name='export_targets__name',
        queryset=RouteTarget.objects.all(),
        to_field_name='name',
        label=_('Export target (name)'),
    )

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(name__icontains=value) |
            Q(rd__icontains=value) |
            Q(description__icontains=value)
        )

    class Meta:
        model = VRF
        fields = ('id', 'name', 'rd', 'enforce_unique', 'description')


@register_filterset
class RouteTargetFilterSet(PrimaryModelFilterSet, TenancyFilterSet):
    importing_vrf_id = django_filters.ModelMultipleChoiceFilter(
        field_name='importing_vrfs',
        queryset=VRF.objects.all(),
        label=_('Importing VRF'),
    )
    importing_vrf = django_filters.ModelMultipleChoiceFilter(
        field_name='importing_vrfs__rd',
        queryset=VRF.objects.all(),
        to_field_name='rd',
        label=_('Import VRF (RD)'),
    )
    exporting_vrf_id = django_filters.ModelMultipleChoiceFilter(
        field_name='exporting_vrfs',
        queryset=VRF.objects.all(),
        label=_('Exporting VRF'),
    )
    exporting_vrf = django_filters.ModelMultipleChoiceFilter(
        field_name='exporting_vrfs__rd',
        queryset=VRF.objects.all(),
        to_field_name='rd',
        label=_('Export VRF (RD)'),
    )
    importing_l2vpn_id = django_filters.ModelMultipleChoiceFilter(
        field_name='importing_l2vpns',
        queryset=L2VPN.objects.all(),
        label=_('Importing L2VPN'),
    )
    importing_l2vpn = django_filters.ModelMultipleChoiceFilter(
        field_name='importing_l2vpns__identifier',
        queryset=L2VPN.objects.all(),
        to_field_name='identifier',
        label=_('Importing L2VPN (identifier)'),
    )
    exporting_l2vpn_id = django_filters.ModelMultipleChoiceFilter(
        field_name='exporting_l2vpns',
        queryset=L2VPN.objects.all(),
        label=_('Exporting L2VPN'),
    )
    exporting_l2vpn = django_filters.ModelMultipleChoiceFilter(
        field_name='exporting_l2vpns__identifier',
        queryset=L2VPN.objects.all(),
        to_field_name='identifier',
        label=_('Exporting L2VPN (identifier)'),
    )

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(name__icontains=value) |
            Q(description__icontains=value)
        )

    class Meta:
        model = RouteTarget
        fields = ('id', 'name', 'description')


@register_filterset
class RIRFilterSet(OrganizationalModelFilterSet):

    class Meta:
        model = RIR
        fields = ('id', 'name', 'slug', 'is_private', 'description')


@register_filterset
class AggregateFilterSet(PrimaryModelFilterSet, TenancyFilterSet, ContactModelFilterSet):
    family = django_filters.NumberFilter(
        field_name='prefix',
        lookup_expr='family'
    )
    prefix = django_filters.CharFilter(
        method='filter_prefix',
        label=_('Prefix'),
    )
    rir_id = django_filters.ModelMultipleChoiceFilter(
        queryset=RIR.objects.all(),
        label=_('RIR (ID)'),
    )
    rir = django_filters.ModelMultipleChoiceFilter(
        field_name='rir__slug',
        queryset=RIR.objects.all(),
        to_field_name='slug',
        label=_('RIR (slug)'),
    )

    class Meta:
        model = Aggregate
        fields = ('id', 'date_added', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(description__icontains=value)
        qs_filter |= Q(prefix__contains=value.strip())
        try:
            prefix = str(netaddr.IPNetwork(value.strip()).cidr)
            qs_filter |= Q(prefix__net_contains_or_equals=prefix)
            qs_filter |= Q(prefix__contains=value.strip())
        except (AddrFormatError, ValueError):
            pass
        return queryset.filter(qs_filter)

    def filter_prefix(self, queryset, name, value):
        if not value.strip():
            return queryset
        try:
            query = str(netaddr.IPNetwork(value).cidr)
            return queryset.filter(prefix=query)
        except (AddrFormatError, ValueError):
            return queryset.none()


@register_filterset
class ASNRangeFilterSet(OrganizationalModelFilterSet, TenancyFilterSet):
    rir_id = django_filters.ModelMultipleChoiceFilter(
        queryset=RIR.objects.all(),
        label=_('RIR (ID)'),
    )
    rir = django_filters.ModelMultipleChoiceFilter(
        field_name='rir__slug',
        queryset=RIR.objects.all(),
        to_field_name='slug',
        label=_('RIR (slug)'),
    )

    class Meta:
        model = ASNRange
        fields = ('id', 'name', 'slug', 'start', 'end', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(name__icontains=value) |
            Q(description__icontains=value)
        )


@register_filterset
class ASNFilterSet(PrimaryModelFilterSet, TenancyFilterSet):
    rir_id = django_filters.ModelMultipleChoiceFilter(
        queryset=RIR.objects.all(),
        label=_('RIR (ID)'),
    )
    rir = django_filters.ModelMultipleChoiceFilter(
        field_name='rir__slug',
        queryset=RIR.objects.all(),
        to_field_name='slug',
        label=_('RIR (slug)'),
    )
    site_group_id = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='sites__group',
        lookup_expr='in',
        label=_('Site group (ID)'),
    )
    site_group = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='sites__group',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Site group (slug)'),
    )
    site_id = django_filters.ModelMultipleChoiceFilter(
        field_name='sites',
        queryset=Site.objects.all(),
        label=_('Site (ID)'),
    )
    site = django_filters.ModelMultipleChoiceFilter(
        field_name='sites__slug',
        queryset=Site.objects.all(),
        to_field_name='slug',
        label=_('Site (slug)'),
    )
    provider_id = django_filters.ModelMultipleChoiceFilter(
        field_name='providers',
        queryset=Provider.objects.all(),
        label=_('Provider (ID)'),
    )
    provider = django_filters.ModelMultipleChoiceFilter(
        field_name='providers__slug',
        queryset=Provider.objects.all(),
        to_field_name='slug',
        label=_('Provider (slug)'),
    )

    class Meta:
        model = ASN
        fields = ('id', 'asn', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(description__icontains=value)
        try:
            qs_filter |= Q(asn=int(value))
        except ValueError:
            pass
        return queryset.filter(qs_filter)


@register_filterset
class RoleFilterSet(OrganizationalModelFilterSet):

    class Meta:
        model = Role
        fields = ('id', 'name', 'slug', 'description', 'weight')


@register_filterset
class PrefixFilterSet(PrimaryModelFilterSet, ScopedFilterSet, TenancyFilterSet, ContactModelFilterSet):
    family = django_filters.NumberFilter(
        field_name='prefix',
        lookup_expr='family'
    )
    prefix = MultiValueCharFilter(
        method='filter_prefix',
        label=_('Prefix'),
    )
    within = django_filters.CharFilter(
        method='search_within',
        label=_('Within prefix'),
    )
    within_include = django_filters.CharFilter(
        method='search_within_include',
        label=_('Within and including prefix'),
    )
    contains = django_filters.CharFilter(
        method='search_contains',
        label=_('Prefixes which contain this prefix or IP'),
    )
    depth = MultiValueNumberFilter(
        field_name='_depth'
    )
    children = MultiValueNumberFilter(
        field_name='_children'
    )
    mask_length = MultiValueNumberFilter(
        field_name='prefix',
        lookup_expr='net_mask_length',
        label=_('Mask length')
    )
    mask_length__gte = django_filters.NumberFilter(
        field_name='prefix',
        lookup_expr='net_mask_length__gte'
    )
    mask_length__lte = django_filters.NumberFilter(
        field_name='prefix',
        lookup_expr='net_mask_length__lte'
    )
    vrf_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VRF.objects.all(),
        label=_('VRF'),
    )
    vrf = django_filters.ModelMultipleChoiceFilter(
        field_name='vrf__rd',
        queryset=VRF.objects.all(),
        to_field_name='rd',
        label=_('VRF (RD)'),
    )
    present_in_vrf_id = django_filters.ModelChoiceFilter(
        queryset=VRF.objects.all(),
        method='filter_present_in_vrf',
        label=_('VRF')
    )
    present_in_vrf = django_filters.ModelChoiceFilter(
        queryset=VRF.objects.all(),
        method='filter_present_in_vrf',
        to_field_name='rd',
        label=_('VRF (RD)'),
    )
    vlan_group_id = django_filters.ModelMultipleChoiceFilter(
        field_name='vlan__group',
        queryset=VLANGroup.objects.all(),
        to_field_name='id',
        label=_('VLAN Group (ID)'),
    )
    vlan_group = django_filters.ModelMultipleChoiceFilter(
        field_name='vlan__group__slug',
        queryset=VLANGroup.objects.all(),
        to_field_name='slug',
        label=_('VLAN Group (slug)'),
    )
    vlan_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VLAN.objects.all(),
        label=_('VLAN (ID)'),
    )
    vlan_vid = django_filters.NumberFilter(
        field_name='vlan__vid',
        label=_('VLAN number (1-4094)'),
    )
    role_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Role.objects.all(),
        label=_('Role (ID)'),
    )
    role = django_filters.ModelMultipleChoiceFilter(
        field_name='role__slug',
        queryset=Role.objects.all(),
        to_field_name='slug',
        label=_('Role (slug)'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=PrefixStatusChoices,
        null_value=None
    )

    class Meta:
        model = Prefix
        fields = ('id', 'scope_id', 'is_pool', 'mark_utilized', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(description__icontains=value)
        qs_filter |= Q(prefix__contains=value.strip())
        try:
            prefix = str(netaddr.IPNetwork(value.strip()).cidr)
            qs_filter |= Q(prefix__net_contains_or_equals=prefix)
            qs_filter |= Q(prefix__contains=value.strip())
        except (AddrFormatError, ValueError):
            pass
        return queryset.filter(qs_filter)

    def filter_prefix(self, queryset, name, value):
        query_values = []
        for v in value:
            try:
                query_values.append(netaddr.IPNetwork(v))
            except (AddrFormatError, ValueError):
                pass
        return queryset.filter(prefix__in=query_values)

    def search_within(self, queryset, name, value):
        value = value.strip()
        if not value:
            return queryset
        try:
            query = str(netaddr.IPNetwork(value).cidr)
            return queryset.filter(prefix__net_contained=query)
        except (AddrFormatError, ValueError):
            return queryset.none()

    def search_within_include(self, queryset, name, value):
        value = value.strip()
        if not value:
            return queryset
        try:
            query = str(netaddr.IPNetwork(value).cidr)
            return queryset.filter(prefix__net_contained_or_equal=query)
        except (AddrFormatError, ValueError):
            return queryset.none()

    def search_contains(self, queryset, name, value):
        value = value.strip()
        if not value:
            return queryset
        try:
            # Searching by prefix
            if '/' in value:
                return queryset.filter(prefix__net_contains_or_equals=str(netaddr.IPNetwork(value).cidr))
            # Searching by IP address
            else:
                return queryset.filter(prefix__net_contains=str(netaddr.IPAddress(value)))
        except (AddrFormatError, ValueError):
            return queryset.none()

    @extend_schema_field(OpenApiTypes.STR)
    def filter_present_in_vrf(self, queryset, name, vrf):
        if vrf is None:
            return queryset.none()
        return queryset.filter(
            Q(vrf=vrf) |
            Q(vrf__export_targets__in=vrf.import_targets.all())
        ).distinct()


@register_filterset
class IPRangeFilterSet(PrimaryModelFilterSet, TenancyFilterSet, ContactModelFilterSet):
    family = django_filters.NumberFilter(
        field_name='start_address',
        lookup_expr='family'
    )
    start_address = MultiValueCharFilter(
        method='filter_address',
        label=_('Address'),
    )
    end_address = MultiValueCharFilter(
        method='filter_address',
        label=_('Address'),
    )
    contains = django_filters.CharFilter(
        method='search_contains',
        label=_('Ranges which contain this prefix or IP'),
    )
    vrf_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VRF.objects.all(),
        label=_('VRF'),
    )
    vrf = django_filters.ModelMultipleChoiceFilter(
        field_name='vrf__rd',
        queryset=VRF.objects.all(),
        to_field_name='rd',
        label=_('VRF (RD)'),
    )
    role_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Role.objects.all(),
        label=_('Role (ID)'),
    )
    role = django_filters.ModelMultipleChoiceFilter(
        field_name='role__slug',
        queryset=Role.objects.all(),
        to_field_name='slug',
        label=_('Role (slug)'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=IPRangeStatusChoices,
        null_value=None
    )
    parent = MultiValueCharFilter(
        method='search_by_parent',
        label=_('Parent prefix'),
    )

    class Meta:
        model = IPRange
        fields = ('id', 'mark_populated', 'mark_utilized', 'size', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(description__icontains=value) | Q(start_address__contains=value) | Q(end_address__contains=value)
        try:
            ipaddress = str(netaddr.IPNetwork(value.strip()))
            qs_filter |= Q(start_address=ipaddress)
            qs_filter |= Q(end_address=ipaddress)
        except (AddrFormatError, ValueError):
            pass
        return queryset.filter(qs_filter)

    def search_contains(self, queryset, name, value):
        value = value.strip()
        if not value:
            return queryset
        try:
            # Strip mask
            ipaddress = netaddr.IPNetwork(value)
            return queryset.filter(start_address__lte=ipaddress, end_address__gte=ipaddress)
        except (AddrFormatError, ValueError):
            return queryset.none()

    def filter_address(self, queryset, name, value):
        try:
            return queryset.filter(**{f'{name}__net_in': value})
        except ValidationError:
            return queryset.none()

    def search_by_parent(self, queryset, name, value):
        if not value:
            return queryset
        q = Q()
        for prefix in value:
            try:
                query = str(netaddr.IPNetwork(prefix.strip()).cidr)
                q |= Q(start_address__net_host_contained=query, end_address__net_host_contained=query)
            except (AddrFormatError, ValueError):
                return queryset.none()
        return queryset.filter(q)


@register_filterset
class IPAddressFilterSet(PrimaryModelFilterSet, TenancyFilterSet, ContactModelFilterSet):
    family = django_filters.NumberFilter(
        field_name='address',
        lookup_expr='family'
    )
    parent = MultiValueCharFilter(
        method='search_by_parent',
        label=_('Parent prefix'),
    )
    address = MultiValueCharFilter(
        method='filter_address',
        label=_('Address'),
    )
    mask_length = MultiValueNumberFilter(
        field_name='address',
        lookup_expr='net_mask_length',
        label=_('Mask length')
    )
    mask_length__gte = django_filters.NumberFilter(
        field_name='address',
        lookup_expr='net_mask_length__gte'
    )
    mask_length__lte = django_filters.NumberFilter(
        field_name='address',
        lookup_expr='net_mask_length__lte'
    )
    vrf_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VRF.objects.all(),
        label=_('VRF'),
    )
    vrf = django_filters.ModelMultipleChoiceFilter(
        field_name='vrf__rd',
        queryset=VRF.objects.all(),
        to_field_name='rd',
        label=_('VRF (RD)'),
    )
    present_in_vrf_id = django_filters.ModelChoiceFilter(
        queryset=VRF.objects.all(),
        method='filter_present_in_vrf',
        label=_('VRF')
    )
    present_in_vrf = django_filters.ModelChoiceFilter(
        queryset=VRF.objects.all(),
        method='filter_present_in_vrf',
        to_field_name='rd',
        label=_('VRF (RD)'),
    )
    assigned_object_type = ContentTypeFilter()
    device = MultiValueCharFilter(
        method='filter_device',
        field_name='name',
        label=_('Device (name)'),
    )
    device_id = MultiValueNumberFilter(
        method='filter_device',
        field_name='pk',
        label=_('Device (ID)'),
    )
    virtual_machine = MultiValueCharFilter(
        method='filter_virtual_machine',
        field_name='name',
        label=_('Virtual machine (name)'),
    )
    virtual_machine_id = MultiValueNumberFilter(
        method='filter_virtual_machine',
        field_name='pk',
        label=_('Virtual machine (ID)'),
    )
    interface = django_filters.ModelMultipleChoiceFilter(
        field_name='interface__name',
        queryset=Interface.objects.all(),
        to_field_name='name',
        label=_('Interface (name)'),
    )
    interface_id = django_filters.ModelMultipleChoiceFilter(
        field_name='interface',
        queryset=Interface.objects.all(),
        label=_('Interface (ID)'),
    )
    vminterface = django_filters.ModelMultipleChoiceFilter(
        field_name='vminterface__name',
        queryset=VMInterface.objects.all(),
        to_field_name='name',
        label=_('VM interface (name)'),
    )
    vminterface_id = django_filters.ModelMultipleChoiceFilter(
        field_name='vminterface',
        queryset=VMInterface.objects.all(),
        label=_('VM interface (ID)'),
    )
    fhrpgroup_id = django_filters.ModelMultipleChoiceFilter(
        field_name='fhrpgroup',
        queryset=FHRPGroup.objects.all(),
        label=_('FHRP group (ID)'),
    )
    assigned_to_interface = django_filters.BooleanFilter(
        method='_assigned_to_interface',
        label=_('Is assigned to an interface'),
    )
    assigned = django_filters.BooleanFilter(
        method='_assigned',
        label=_('Is assigned'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=IPAddressStatusChoices,
        null_value=None
    )
    role = django_filters.MultipleChoiceFilter(
        choices=IPAddressRoleChoices
    )
    service_id = django_filters.ModelMultipleChoiceFilter(
        field_name='services',
        queryset=Service.objects.all(),
        label=_('Application Service (ID)'),
    )
    nat_inside_id = django_filters.ModelMultipleChoiceFilter(
        field_name='nat_inside',
        queryset=IPAddress.objects.all(),
        label=_('NAT inside IP address (ID)'),
    )

    class Meta:
        model = IPAddress
        fields = ('id', 'dns_name', 'description', 'assigned_object_type', 'assigned_object_id')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = (
            Q(dns_name__icontains=value) |
            Q(description__icontains=value) |
            Q(address__istartswith=value)
        )
        return queryset.filter(qs_filter)

    def search_by_parent(self, queryset, name, value):
        if not value:
            return queryset
        q = Q()
        for prefix in value:
            try:
                query = str(netaddr.IPNetwork(prefix.strip()).cidr)
                q |= Q(address__net_host_contained=query)
            except (AddrFormatError, ValueError):
                return queryset.none()
        return queryset.filter(q)

    def parse_inet_addresses(self, value):
        """
        Parse networks or IP addresses and cast to a format
        acceptable by the Postgres inet type.

        Skips invalid values.
        """
        parsed = []
        for addr in value:
            if netaddr.valid_ipv4(addr) or netaddr.valid_ipv6(addr):
                parsed.append(addr)
                continue
            try:
                network = netaddr.IPNetwork(addr)
                parsed.append(str(network))
            except (AddrFormatError, ValueError):
                continue
        return parsed

    def filter_address(self, queryset, name, value):
        # Let's first parse the addresses passed
        # as argument. If they are all invalid,
        # we return an empty queryset
        value = self.parse_inet_addresses(value)
        if len(value) == 0:
            return queryset.none()

        try:
            return queryset.filter(address__net_in=value)
        except ValidationError:
            return queryset.none()

    @extend_schema_field(OpenApiTypes.STR)
    def filter_present_in_vrf(self, queryset, name, vrf):
        if vrf is None:
            return queryset.none()
        return queryset.filter(
            Q(vrf=vrf) |
            Q(vrf__export_targets__in=vrf.import_targets.all())
        ).distinct()

    def filter_device(self, queryset, name, value):
        devices = Device.objects.filter(**{'{}__in'.format(name): value})
        if not devices.exists():
            return queryset.none()
        interface_ids = []
        for device in devices:
            interface_ids.extend(device.vc_interfaces().values_list('id', flat=True))
        return queryset.filter(
            interface__in=interface_ids
        )

    def filter_virtual_machine(self, queryset, name, value):
        virtual_machines = VirtualMachine.objects.filter(**{'{}__in'.format(name): value})
        if not virtual_machines.exists():
            return queryset.none()
        interface_ids = []
        for vm in virtual_machines:
            interface_ids.extend(vm.interfaces.values_list('id', flat=True))
        return queryset.filter(
            vminterface__in=interface_ids
        )

    def _assigned_to_interface(self, queryset, name, value):
        content_types = ContentType.objects.get_for_models(Interface, VMInterface).values()
        if value:
            return queryset.filter(
                assigned_object_type__in=content_types,
                assigned_object_id__isnull=False
            )
        else:
            return queryset.exclude(
                assigned_object_type__in=content_types,
                assigned_object_id__isnull=False
            )

    def _assigned(self, queryset, name, value):
        if value:
            return queryset.exclude(
                assigned_object_type__isnull=True,
                assigned_object_id__isnull=True
            )
        else:
            return queryset.filter(
                assigned_object_type__isnull=True,
                assigned_object_id__isnull=True
            )


@register_filterset
class FHRPGroupFilterSet(PrimaryModelFilterSet):
    protocol = django_filters.MultipleChoiceFilter(
        choices=FHRPGroupProtocolChoices
    )
    auth_type = django_filters.MultipleChoiceFilter(
        choices=FHRPGroupAuthTypeChoices
    )
    related_ip = django_filters.ModelMultipleChoiceFilter(
        queryset=IPAddress.objects.all(),
        method='filter_related_ip'
    )

    class Meta:
        model = FHRPGroup
        fields = ('id', 'group_id', 'name', 'auth_key', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        return queryset.filter(
            Q(description__icontains=value) |
            Q(group_id__contains=value) |
            Q(name__icontains=value)
        )

    @extend_schema_field(OpenApiTypes.STR)
    def filter_related_ip(self, queryset, name, value):
        """
        Filter by VRF & prefix of assigned IP addresses.
        """
        ip_filter = Q()
        for ipaddress in value:
            if ipaddress.vrf:
                q = Q(
                    ip_addresses__address__net_contained_or_equal=ipaddress.address,
                    ip_addresses__vrf=ipaddress.vrf
                )
            else:
                q = Q(
                    ip_addresses__address__net_contained_or_equal=ipaddress.address,
                    ip_addresses__vrf__isnull=True
                )
            ip_filter |= q

        return queryset.filter(ip_filter)


@register_filterset
class FHRPGroupAssignmentFilterSet(ChangeLoggedModelFilterSet):
    interface_type = ContentTypeFilter()
    group_id = django_filters.ModelMultipleChoiceFilter(
        queryset=FHRPGroup.objects.all(),
        label=_('Group (ID)'),
    )
    device = MultiValueCharFilter(
        method='filter_device',
        field_name='name',
        label=_('Device (name)'),
    )
    device_id = MultiValueNumberFilter(
        method='filter_device',
        field_name='pk',
        label=_('Device (ID)'),
    )
    virtual_machine = MultiValueCharFilter(
        method='filter_virtual_machine',
        field_name='name',
        label=_('Virtual machine (name)'),
    )
    virtual_machine_id = MultiValueNumberFilter(
        method='filter_virtual_machine',
        field_name='pk',
        label=_('Virtual machine (ID)'),
    )

    class Meta:
        model = FHRPGroupAssignment
        fields = ('id', 'group_id', 'interface_type', 'interface_id', 'priority')

    def filter_device(self, queryset, name, value):
        devices = Device.objects.filter(**{f'{name}__in': value})
        if not devices.exists():
            return queryset.none()
        interface_ids = []
        for device in devices:
            interface_ids.extend(device.vc_interfaces().values_list('id', flat=True))
        return queryset.filter(
            Q(interface_type=ContentType.objects.get_for_model(Interface), interface_id__in=interface_ids)
        )

    def filter_virtual_machine(self, queryset, name, value):
        virtual_machines = VirtualMachine.objects.filter(**{f'{name}__in': value})
        if not virtual_machines.exists():
            return queryset.none()
        interface_ids = []
        for vm in virtual_machines:
            interface_ids.extend(vm.interfaces.values_list('id', flat=True))
        return queryset.filter(
            Q(interface_type=ContentType.objects.get_for_model(VMInterface), interface_id__in=interface_ids)
        )


@register_filterset
class VLANGroupFilterSet(OrganizationalModelFilterSet, TenancyFilterSet):
    scope_type = ContentTypeFilter()
    region = django_filters.NumberFilter(
        method='filter_scope'
    )
    site_group = django_filters.NumberFilter(
        method='filter_scope'
    )
    site = django_filters.NumberFilter(
        method='filter_scope'
    )
    location = django_filters.NumberFilter(
        method='filter_scope'
    )
    rack = django_filters.NumberFilter(
        method='filter_scope'
    )
    cluster_group = django_filters.NumberFilter(
        method='filter_scope'
    )
    cluster = django_filters.NumberFilter(
        method='filter_scope'
    )
    contains_vid = django_filters.NumberFilter(
        field_name='vid_ranges',
        lookup_expr='range_contains',
    )

    class Meta:
        model = VLANGroup
        fields = ('id', 'name', 'slug', 'description', 'scope_id')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = (
            Q(name__icontains=value) |
            Q(description__icontains=value)
        )
        return queryset.filter(qs_filter)

    def filter_scope(self, queryset, name, value):
        model_name = name.replace('_', '')
        return queryset.filter(
            scope_type=ContentType.objects.get(model=model_name),
            scope_id=value
        )


@register_filterset
class VLANFilterSet(PrimaryModelFilterSet, TenancyFilterSet):
    region_id = TreeNodeMultipleChoiceFilter(
        queryset=Region.objects.all(),
        field_name='site__region',
        lookup_expr='in',
        label=_('Region (ID)'),
    )
    region = TreeNodeMultipleChoiceFilter(
        queryset=Region.objects.all(),
        field_name='site__region',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Region (slug)'),
    )
    site_group_id = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='site__group',
        lookup_expr='in',
        label=_('Site group (ID)'),
    )
    site_group = TreeNodeMultipleChoiceFilter(
        queryset=SiteGroup.objects.all(),
        field_name='site__group',
        lookup_expr='in',
        to_field_name='slug',
        label=_('Site group (slug)'),
    )
    site_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Site.objects.all(),
        label=_('Site (ID)'),
    )
    site = django_filters.ModelMultipleChoiceFilter(
        field_name='site__slug',
        queryset=Site.objects.all(),
        to_field_name='slug',
        label=_('Site (slug)'),
    )
    group_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VLANGroup.objects.all(),
        label=_('Group (ID)'),
    )
    group = django_filters.ModelMultipleChoiceFilter(
        field_name='group__slug',
        queryset=VLANGroup.objects.all(),
        to_field_name='slug',
        label=_('Group'),
    )
    role_id = django_filters.ModelMultipleChoiceFilter(
        queryset=Role.objects.all(),
        label=_('Role (ID)'),
    )
    role = django_filters.ModelMultipleChoiceFilter(
        field_name='role__slug',
        queryset=Role.objects.all(),
        to_field_name='slug',
        label=_('Role (slug)'),
    )
    status = django_filters.MultipleChoiceFilter(
        choices=VLANStatusChoices,
        null_value=None
    )
    available_at_site = django_filters.ModelChoiceFilter(
        queryset=Site.objects.all(),
        method='get_for_site'
    )
    available_on_device = django_filters.ModelChoiceFilter(
        queryset=Device.objects.all(),
        method='get_for_device'
    )
    available_on_virtualmachine = django_filters.ModelChoiceFilter(
        queryset=VirtualMachine.objects.all(),
        method='get_for_virtualmachine'
    )
    qinq_role = django_filters.MultipleChoiceFilter(
        choices=VLANQinQRoleChoices
    )
    qinq_svlan_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VLAN.objects.all(),
        label=_('Q-in-Q SVLAN (ID)'),
    )
    qinq_svlan_vid = MultiValueNumberFilter(
        field_name='qinq_svlan__vid',
        label=_('Q-in-Q SVLAN number (1-4094)'),
    )
    l2vpn_id = django_filters.ModelMultipleChoiceFilter(
        field_name='l2vpn_terminations__l2vpn',
        queryset=L2VPN.objects.all(),
        label=_('L2VPN (ID)'),
    )
    l2vpn = django_filters.ModelMultipleChoiceFilter(
        field_name='l2vpn_terminations__l2vpn__identifier',
        queryset=L2VPN.objects.all(),
        to_field_name='identifier',
        label=_('L2VPN'),
    )
    interface_id = django_filters.ModelChoiceFilter(
        queryset=Interface.objects.all(),
        method='filter_interface_id',
        label=_('Assigned interface')
    )
    vminterface_id = django_filters.ModelChoiceFilter(
        queryset=VMInterface.objects.all(),
        method='filter_vminterface_id',
        label=_('Assigned VM interface')
    )

    class Meta:
        model = VLAN
        fields = ('id', 'vid', 'name', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(name__icontains=value) | Q(description__icontains=value)
        try:
            qs_filter |= Q(vid=int(value.strip()))
        except ValueError:
            pass
        return queryset.filter(qs_filter)

    @extend_schema_field(OpenApiTypes.STR)
    def get_for_site(self, queryset, name, value):
        return queryset.get_for_site(value)

    @extend_schema_field(OpenApiTypes.STR)
    def get_for_device(self, queryset, name, value):
        return queryset.get_for_device(value)

    @extend_schema_field(OpenApiTypes.STR)
    def get_for_virtualmachine(self, queryset, name, value):
        return queryset.get_for_virtualmachine(value)

    @extend_schema_field(OpenApiTypes.INT)
    def filter_interface_id(self, queryset, name, value):
        if value is None:
            return queryset.none()
        return queryset.filter(
            Q(interfaces_as_tagged=value) |
            Q(interfaces_as_untagged=value)
        ).distinct()

    @extend_schema_field(OpenApiTypes.INT)
    def filter_vminterface_id(self, queryset, name, value):
        if value is None:
            return queryset.none()
        return queryset.filter(
            Q(vminterfaces_as_tagged=value) |
            Q(vminterfaces_as_untagged=value)
        ).distinct()


@register_filterset
class VLANTranslationPolicyFilterSet(PrimaryModelFilterSet):

    class Meta:
        model = VLANTranslationPolicy
        fields = ('id', 'name', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = (
            Q(name__icontains=value) |
            Q(description__icontains=value)
        )
        return queryset.filter(qs_filter)


@register_filterset
class VLANTranslationRuleFilterSet(NetBoxModelFilterSet):
    policy_id = django_filters.ModelMultipleChoiceFilter(
        queryset=VLANTranslationPolicy.objects.all(),
        label=_('VLAN Translation Policy (ID)'),
    )
    policy = django_filters.ModelMultipleChoiceFilter(
        field_name='policy__name',
        queryset=VLANTranslationPolicy.objects.all(),
        to_field_name='name',
        label=_('VLAN Translation Policy (name)'),
    )

    class Meta:
        model = VLANTranslationRule
        fields = ('id', 'policy_id', 'policy', 'local_vid', 'remote_vid', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = (
            Q(policy__name__icontains=value)
        )
        try:
            int_value = int(value.strip())
            qs_filter |= Q(local_vid=int_value)
            qs_filter |= Q(remote_vid=int_value)
        except ValueError:
            pass
        return queryset.filter(qs_filter)


@register_filterset
class ServiceTemplateFilterSet(PrimaryModelFilterSet):
    port = NumericArrayFilter(
        field_name='ports',
        lookup_expr='contains'
    )

    class Meta:
        model = ServiceTemplate
        fields = ('id', 'name', 'protocol', 'description')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = (
            Q(name__icontains=value) |
            Q(description__icontains=value)
        )
        return queryset.filter(qs_filter)


@register_filterset
class ServiceFilterSet(ContactModelFilterSet, PrimaryModelFilterSet):
    parent_object_type = ContentTypeFilter()
    device = MultiValueCharFilter(
        method='filter_device',
        field_name='name',
        label=_('Device (name)'),
    )
    device_id = MultiValueNumberFilter(
        method='filter_device',
        field_name='pk',
        label=_('Device (ID)'),
    )
    virtual_machine = MultiValueCharFilter(
        method='filter_virtual_machine',
        field_name='name',
        label=_('Virtual machine (name)'),
    )
    virtual_machine_id = MultiValueNumberFilter(
        method='filter_virtual_machine',
        field_name='pk',
        label=_('Virtual machine (ID)'),
    )
    fhrpgroup = MultiValueCharFilter(
        method='filter_fhrp_group',
        field_name='name',
        label=_('FHRP Group (name)'),
    )
    fhrpgroup_id = MultiValueNumberFilter(
        method='filter_fhrp_group',
        field_name='pk',
        label=_('FHRP Group (ID)'),
    )
    ip_address_id = django_filters.ModelMultipleChoiceFilter(
        field_name='ipaddresses',
        queryset=IPAddress.objects.all(),
        label=_('IP address (ID)'),
    )
    ip_address = django_filters.ModelMultipleChoiceFilter(
        field_name='ipaddresses__address',
        queryset=IPAddress.objects.all(),
        to_field_name='address',
        label=_('IP address'),
    )
    port = NumericArrayFilter(
        field_name='ports',
        lookup_expr='contains'
    )

    class Meta:
        model = Service
        fields = ('id', 'name', 'protocol', 'description', 'parent_object_type', 'parent_object_id')

    def search(self, queryset, name, value):
        if not value.strip():
            return queryset
        qs_filter = Q(name__icontains=value) | Q(description__icontains=value)
        return queryset.filter(qs_filter)

    def filter_device(self, queryset, name, value):
        devices = Device.objects.filter(**{'{}__in'.format(name): value})
        if not devices.exists():
            return queryset.none()
        service_ids = []
        for device in devices:
            service_ids.extend(device.services.values_list('id', flat=True))
        return queryset.filter(id__in=service_ids)

    def filter_fhrp_group(self, queryset, name, value):
        groups = FHRPGroup.objects.filter(**{'{}__in'.format(name): value})
        if not groups.exists():
            return queryset.none()
        service_ids = []
        for group in groups:
            service_ids.extend(group.services.values_list('id', flat=True))
        return queryset.filter(id__in=service_ids)

    def filter_virtual_machine(self, queryset, name, value):
        virtual_machines = VirtualMachine.objects.filter(**{'{}__in'.format(name): value})
        if not virtual_machines.exists():
            return queryset.none()
        service_ids = []
        for vm in virtual_machines:
            service_ids.extend(vm.services.values_list('id', flat=True))
        return queryset.filter(id__in=service_ids)


class PrimaryIPFilterSet(django_filters.FilterSet):
    """
    An inheritable FilterSet for models which support primary IP assignment.
    """
    primary_ip4_id = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_ip4',
        queryset=IPAddress.objects.all(),
        label=_('Primary IPv4 (ID)'),
    )
    primary_ip4 = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_ip4__address',
        queryset=IPAddress.objects.all(),
        to_field_name='address',
        label=_('Primary IPv4 (address)'),
    )
    primary_ip6_id = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_ip6',
        queryset=IPAddress.objects.all(),
        label=_('Primary IPv6 (ID)'),
    )
    primary_ip6 = django_filters.ModelMultipleChoiceFilter(
        field_name='primary_ip6__address',
        queryset=IPAddress.objects.all(),
        to_field_name='address',
        label=_('Primary IPv6 (address)'),
    )