enum:
                          - INVALID
                          - MERGE
                          - ADD
                          - REMOVE
                          - INSERT_BEFORE
                          - INSERT_AFTER
                          - INSERT_FIRST
                          - REPLACE

                          enum:
                          - INVALID
                          - MERGE
                          - ADD
                          - REMOVE
                          - INSERT_BEFORE
                          - INSERT_AFTER
                          - INSERT_FIRST
                          - REPLACE

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ipset

import (
	"errors"
	"net/netip"
)

func RealNlDeps() NetlinkIpsetDeps {
	return &realDeps{}
}

type realDeps struct{}

func (m *realDeps) ipsetIPHashCreate(name string, v6 bool) error {

	// allow overriding for tests
	netnsRunner        func(fdable NetnsFd, toRun func() error) error
	hostsideProbeIPSet ipset.IPSet
}

var _ MeshDataplane = &NetServer{}

func newNetServer(ztunnelServer ZtunnelServer, podNsMap *podNetnsCache,
	iptablesConfigurator *iptables.IptablesConfigurator, podNs PodNetnsFinder,
	probeSet ipset.IPSet,
) *NetServer {
	return &NetServer{
		ztunnelServer:        ztunnelServer,
		currentPodSnapshot:   podNsMap,

}

// createHostsideProbeIpset creates an ipset. This is designed to be called from the host netns.
// Note that if the ipset already exist by name, Create will not return an error.
//
// We will unconditionally flush our set before use here, so it shouldn't matter.
func createHostsideProbeIpset(isV6 bool) (ipset.IPSet, error) {
	linDeps := ipset.RealNlDeps()
	probeSet, err := ipset.NewIPSet(iptables.ProbeIPSet, isV6, linDeps)

	"istio.io/istio/pkg/test/util/assert"
)

func TestGetPodIPIfPodIPPresent(t *testing.T) {
	pod := &corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "test",
			Namespace: "test",
		},
		Spec: corev1.PodSpec{
			NodeName: "derp",
		},
		Status: corev1.PodStatus{
			PodIP: "11.1.1.12",
		},
	}

	podIPs := GetPodIPsIfPresent(pod)
	assert.Equal(t, len(podIPs), 1)
}

	err := netlink.IpsetFlush(name)
	if err != nil {
		return fmt.Errorf("failed to flush ipset %s: %w", name, err)
	}
	return nil
}

// Alpine and some distros struggles with this - ipset CLI utilities support this, but
// the kernel can be out of sync with the CLI utility, leading to errors like:
//
// ipset v7.10: Argument `comment' is supported in the kernel module of the set type hash:ip

To unwrap the first layer, we terminate TLS.
As part of this, we need to pick the correct certificate to serve on behalf of the destination workload.
As discussed in [HBONE](#hbone), this is based on the destination IP.
Additionally, we enforce the peer has a valid mesh identity (but do not assert _which_ identity, yet).

Next, we terminate the CONNECT.

	err := netServer.RemovePodFromMesh(ctx, pod)
	assert.NoError(t, err)
	assert.Equal(t, ztunnelServer.deletedPods.Load(), 1)
	assert.Equal(t, nlDeps.DelInpodMarkIPRuleCnt.Load(), 1)
	assert.Equal(t, nlDeps.DelLoopbackRoutesCnt.Load(), 1)
	// make sure the uid was taken from cache and netns closed
	netns := fixture.podNsMap.Take(string(pod.UID))
	assert.Equal(t, nil, netns)

	// run gc to clean up ns:

	iptablesBuilder := builder.NewIptablesRuleBuilder(ipbuildConfig(cfg.cfg))

	// Insert jumps to our custom chains
	// This is mostly just for visual tidiness and cleanup, as we can delete the secondary chains and jumps
	// without polluting the main table too much.

	// -t mangle -A PREROUTING -j ISTIO_PRERT
	iptablesBuilder.AppendRule(