feat(iface): support runtime link configuration - #25
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Add bounded runtime IP MTU updates so cached interface capabilities, TCP MSS calculations, and native fragmentation observe administrative MTU changes without rebuilding the interface. Preserve the device capability ceiling and reject unsafe values atomically. Add a runtime neighbor-discovery mode for DragonOS IFF_NOARP integration. Dynamic ARP and NDISC learning is disabled while Linux-compatible IPv6 solicitation replies, explicit permanent neighbors, direct device-address fallback, readiness reporting, and fragment invalidation remain coherent across mode transitions. Cover MTU boundaries, dynamic cache invalidation, ARP/NDISC behavior, permanent-neighbor priority, and pending-fragment transitions. Signed-off-by: longjin <longjin@dragonos.org>
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Summary
IFF_NOARPValidation
cargo fmt --all -- --checkcargo test(632 unit tests and 7 doc tests)DragonOS-Community/DragonOS#2233