示意图如下： netfilter-hookfn2 netfilter hook 的回调函数机制具有以下特性： 回调函数按优先级依次执行，只有上一回调函数返回 NF_ACCEPT 才会继续执行下一回调函数。 任一回调函数都可以中断该 hook 的回调函数执行链，同时要求整个网络栈中止对数据包的处理。 iptables ...

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Netfilter is an infrastructure; it is the basic API that the Linux 2.4 kernel offers for applications that want to view and manipulate network packets. Iptables is an interface that uses Netfilter ...

Netfilter is a packet filtering and network address translation (NAT) framework built into the Linux kernel that is managed through front-end utilities, such as IPtables and UFW.

In order to include Netfilter as a configuration item, you must enable Code maturity-level options for development and/or incomplete code/drivers. With this option enabled, proceed to Networking ...

After we write our hook function, we have to register its options with the nf_hook_ops struct located in linux/netfilter.h. struct nf_hook_ops { struct list_head list; nf_hookfn *hook; int pf; int ...

Netfilter is a Linux kernel utility that handles various network functions, such as facilitating Network Address Translation (NAT) and Linux's IPTables firewall. All was fine.