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.

Spent some more time analyzing the Chinese netfilter driver discovered by @struppigel: The core functionality seems to be eavesdropping on SSL connections. In addition to the IP redirecting ...

The vulnerability, which affects Linux kernel versions 5.14 through 6.6, resides in the NF_tables, a kernel component enabling the Netfilter, which in turn facilitates a variety of network ...