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Conditionally initialize rxring only when fake_autottl is enabled.
Extract poll_once() using libc::poll directly; fd=-1 trick eliminates
the need for conditional branching on optional rxring fd, as poll sets
revents=0 for negative fds per POSIX. Drop nix poll feature.
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Extract nfqueue initialization (open, bind, set O_NONBLOCK) and rxring
initialization (cBPF filter, open) into separate functions. Inline
BorrowedFd scope as a let binding to eliminate floating
q_ready/rx_ready declarations. Move SYNACK_443_CBPF const into
open_rxring.
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- Split next_packet into current_packet (read) and advance (release)
to avoid TOCTOU between kernel overwrite and packet processing
- Add current_frame helper to avoid duplicated pointer arithmetic
- Switch AF_PACKET socket to ETH_P_ALL for future IPv6 support
- Add FRAME_SIZE comment explaining 128B is sufficient for IP header
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- Add rxring module with RxRing struct (new/next_packet unimplemented)
- Attach cBPF filter for TCP src port 443 SYN/ACK packets
- Multiplex nfqueue and rxring via poll in run loop
- Move fake_autottl SYN/ACK handling to pkt::put_hop
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