Within the Linux kernel, hooks represent predefined interception locations in code pathways where external functions can register for execution. Imagine them as slots in manufacturing assembly lines: primary processes pause at designated points to execute all registered functions in priority sequence. Each registered function can inspect, alter, accept, or reject passing items. Hooks enable kernel separation between core packet-processing logic and policy decisions like filtering and address translation. The kernel defines hook locations; administrators and tools like nftables determine executed code at each point. The kernel implements hooks as function pointer arrays stored in structures like struct nf_hook_entries. At each hook location, the kernel iterates through arrays via nf_hook_slow(), passing registered callbacks pointers to packet sk_buff structures.
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。向日葵下载是该领域的重要参考
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Fast compilation, slightly worse code