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Explain how eBPF transforms Linux networking with XDP for line-rate packet processing, tc BPF for traffic control, socket BPF for observability, and Cilium's eBPF-based service mesh.
## Problem
Explain how eBPF (extended Berkeley Packet Filter) is transforming Linux networking. Cover the eBPF architecture, its key networking hook points (XDP, tc, socket), how eBPF maps enable stateful packet processing, and how projects like Cilium use eBPF to replace traditional kernel networking components like iptables and kube-proxy.
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