signal

Documentation

Overview

Package signal provides handling notifications from perf RB signal map.

Index

• Constants
• func MuteChannel(signal int) error
• func RegisterChannel(signal int, ch chan<- SignalData) error
• func SetupSignalListener()
• func UnmuteChannel(signal int) error
• type SignalData
• type SignalMsg

Constants

const (
	// SignalNatFillUp denotes potential congestion on the NAT table
	SignalNatFillUp = iota
	// SignalCTFillUp denotes potential congestion on the CT table
	SignalCTFillUp
	SignalTypeMax
)

const (
	// SignalProtoV4 denotes IPv4 protocol
	SignalProtoV4 = iota
	// SignalProtoV6 denotes IPv6 protocol
	SignalProtoV6
	SignalProtoMax
)

const (
	// SignalWakeGC triggers wake-up of the CT garbage collector
	SignalWakeGC = iota
	// SignalChanInvalid must be last one
	SignalChanInvalid
	SignalChanMax
)

Functions

func MuteChannel

func MuteChannel(signal int) error

MuteChannel tells to not send any new events to a particular channel for a given signal.

func RegisterChannel

func RegisterChannel(signal int, ch chan<- SignalData) error

RegisterChannel registers a go channel for a given signal.

func SetupSignalListener

func SetupSignalListener()

SetupSignalListener bootstraps signal listener infrastructure.

func UnmuteChannel

func UnmuteChannel(signal int) error

UnmuteChannel tells to allow sending new events to a particular channel for a given signal.

Types

type SignalData

type SignalData uint32

SignalData holds actual data the BPF program sent along with the signal. Can be extended upon need for new signals.

type SignalMsg

type SignalMsg struct {
	Which uint32
	Data  SignalData
}

SignalMsg is the message we receive from BPF datapath