Use ebpf to accelerate Service and NetworkPolicy if kernel >= 4.19

[mars1024]

Issue Description

Type: feature request

Describe what feature you want

Additional context

[hhyasdf]

Use a combination of "ipvlan l3 mode + ebpf mode service" might be a good choice to keep using the host netns routing function and bypass netfilter hooks at the same time.

But another news is cilium will not support ipvlan mode any more. https://docs.cilium.io/en/v1.11/operations/upgrade/#deprecated-options

[hhyasdf]

"For eBPF Host-Routing, the routing table is consulted directly from eBPF so this optimization is entirely transparent and compatible with any other services running on the system providing route distribution" - https://cilium.io/blog/2021/05/11/cni-benchmark

Which means, in theory, the host-routing mode of cilium is compatible naturally with hybridnet.