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CONFIG_NETFILTER_XT_MATCH_U32: 'u32' match support

General informations

The Linux kernel configuration item CONFIG_NETFILTER_XT_MATCH_U32:

Help text

u32 allows you to extract quantities of up to 4 bytes from a packet, AND them with specified masks, shift them by specified amounts and test whether the results are in any of a set of specified ranges. The specification of what to extract is general enough to skip over headers with lengths stored in the packet, as in IP or TCP header lengths.

Details and examples are in the kernel module source.

Hardware

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