link

var (

	// ErrNotExist denotes that the interface in question does not exist
	ErrNotExist = errors.New("interface does not exist")

	// ErrNotUp denotes that the interface in question is not up
	ErrNotUp = errors.New("interface is currently not up")
)

var (

	// CaptureLengthFixed denotes a simple fixed snaplen strategy
	CaptureLengthFixed = func(snaplen int) CaptureLengthStrategy {
		return func(l *Link) int {
			return snaplen
		}
	}

	// CaptureLengthMinimalIPv4Header indicates that the minimal necessary length to
	// facilitate IPv4 layer analysis should be chosen
	CaptureLengthMinimalIPv4Header = func(l *Link) int {
		return int(l.Type.IPHeaderOffset()) + ipv4.HeaderLen
	}

	// CaptureLengthMinimalIPv6Header indicates that the minimal necessary length to
	// facilitate IPv6 layer analysis should be chosen
	CaptureLengthMinimalIPv6Header = func(l *Link) int {
		return int(l.Type.IPHeaderOffset()) + ipv6.HeaderLen
	}

	// CaptureLengthMinimalIPv4Transport indicates that the minimal necessary length to
	// facilitate IPv4 transport layer analysis should be chosen
	CaptureLengthMinimalIPv4Transport = func(l *Link) int {
		return int(l.Type.IPHeaderOffset()) + ipv4.HeaderLen + 14
	}

	// CaptureLengthMinimalIPv6Transport indicates that the minimal necessary length to
	// facilitate IPv6 transport layer analysis should be chosen
	CaptureLengthMinimalIPv6Transport = func(l *Link) int {
		return int(l.Type.IPHeaderOffset()) + ipv6.HeaderLen + 14
	}
)

var EmptyEthernetLink = Link{
	Interface: Interface{
		Type: TypeEthernet,
	},
}

var ErrIndexOutOfBounds = errors.New("interface index out of bounds")