internal

Documentation

Index

• Variables
• func CheckHookMap(m *ebpf.Map) error
• func TcpdumpExprToBPF(filterExpr string, linkType layers.LinkType) ([]bpf.Instruction, error)

Variables

var HookMapSpec = &ebpf.MapSpec{
	Type:       ebpf.ProgramArray,
	KeySize:    4,
	ValueSize:  4,
	MaxEntries: 4,
}

HookMapSpec is the ABI of the underlying prog map created

Functions

func CheckHookMap

func CheckHookMap(m *ebpf.Map) error

CheckHookMap checks the given map against HookMapABI to have appropriate values Only checks Type, KeySize, ValueSize

func TcpdumpExprToBPF

func TcpdumpExprToBPF(filterExpr string, linkType layers.LinkType) ([]bpf.Instruction, error)

tcpdumpExprToBPF converts a tcpdump / libpcap filter expression to cBPF using libpcap