xtables

package

v0.0.1 Latest Latest Go to latest Published: Nov 3, 2022 License: MIT Imports: 4 Imported by: 0

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Valid go.mod file
Redistributable license
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Stable version
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Repository

github.com/ngrok/firewall_toolkit

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Documentation ¶

Overview ¶

A wrapper for google/gopacket pcap compilation for use with xt_bpf

A library for marshaling xt_bpf structs for use with nftables

Index ¶

Constants
func CompileBpfForXtInfo(filter string) ([]bpf.RawInstruction, error)
func MarshalBpfBytecode(filter string) ([]byte, error)
func MarshalBpfFd(fd int) ([]byte, error)
func MarshalBpfPinned(path string) ([]byte, error)

Constants ¶

View Source

const (
	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter/xt_bpf.h
	XtBpfModeBytecode = iota
	XtBpfModeFdPinned
	XtBpfModeFdElf
)

Constants for designating the mode xt_bpf can run in

View Source

const (
	XtBpfModePathPinned = XtBpfModeFdPinned

	XtBpfMaxNumInstr = 64

	// sizeof(struct sock_filter) == 8
	XtBpfPathMax = XtBpfMaxNumInstr * 8

	// XT_ALIGN(sizeof(struct xt_bpf_info)) == 528
	// the xt_bpf_info_v1 is expected to be aligned and padded to the max
	XtBpfInfoV1Size = 528
)

Constants for specifying bpf program lengths and attributes

Variables ¶

This section is empty.

Functions ¶

func CompileBpfForXtInfo ¶

func CompileBpfForXtInfo(filter string) ([]bpf.RawInstruction, error)

Compile a tcpdump-style filter string to bpf compatible with xtables

func MarshalBpfBytecode ¶

func MarshalBpfBytecode(filter string) ([]byte, error)

Marshal a tcpdump-style filter string into bytes compatible with xtables

func MarshalBpfFd ¶

func MarshalBpfFd(fd int) ([]byte, error)

Marshal a socket file descriptor into bytes compatible with xtables

func MarshalBpfPinned ¶

func MarshalBpfPinned(path string) ([]byte, error)

Marshal a pinned program path into bytes compatible with xtables

Types ¶

This section is empty.

Source Files ¶

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