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New firewall for the Linux kernel

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Linux

The Netfilter development team's Patrick McHardy has released an alpha version of nftables, a new firewall implementation for the Linux kernel, with a user space tool for controlling the firewall.

nftables introduces a fundamental distinction between the user space defined rules and network objects in the kernel: the kernel component works with generic data such as IP addresses, ports and protocols and provides some generic operations for comparing the values of a packet with constants or for discarding a packet.

Firewall rules, which the user defines with the nft tool, are checked by the nft program for correctness and then translated into the required generic operations and kernel objects.

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