Netfilter hooks constitute function pointer arrays registered inside kernel packet processing paths. At each hook point, the kernel sequentially iterates through every registered function by priority, passing pointers to packet socket buffers (sk_buff). Registered functions can accept, discard, modify, or queue packets. Userspace utilities like nftables register callback functions at these hooks by transmitting commands through netlink sockets, kernel-userspace Inter-Process Communication channels designed for networking configuration.
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2026年04月09日 13:25:39
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