BPF_H                                       = 0x8
	BPF_IMM                                     = 0x0
	BPF_IND                                     = 0x40
	BPF_JA                                      = 0x0
	BPF_JCOND                                   = 0xe0
	BPF_JEQ                                     = 0x10
	BPF_JGE                                     = 0x30
	BPF_JGT                                     = 0x20

	BYTE $0x1c; BYTE $0x1d; BYTE $0x1e; BYTE $0x1f
	BYTE $0x40; BYTE $0x5a; BYTE $0x7f; BYTE $0x7b
	BYTE $0x5b; BYTE $0x6c; BYTE $0x50; BYTE $0x7d
	BYTE $0x4d; BYTE $0x5d; BYTE $0x5c; BYTE $0x4e
	BYTE $0x6b; BYTE $0x60; BYTE $0x4b; BYTE $0x61
	BYTE $0xf0; BYTE $0xf1; BYTE $0xf2; BYTE $0xf3
	BYTE $0xf4; BYTE $0xf5; BYTE $0xf6; BYTE $0xf7
	BYTE $0xf8; BYTE $0xf9; BYTE $0x7a; BYTE $0x5e

)

const (
	//options
	//byte1
	BPX_OPNFHIGH = 0x80
	//byte2
	BPX_OPNFEXEC = 0x80
	//byte3
	BPX_O_NOLARGEFILE = 0x08
	BPX_O_LARGEFILE   = 0x04
	BPX_O_ASYNCSIG    = 0x02
	BPX_O_SYNC        = 0x01
	//byte4
	BPX_O_CREXCL   = 0xc0
	BPX_O_CREAT    = 0x80
	BPX_O_EXCL     = 0x40
	BPX_O_NOCTTY   = 0x20
	BPX_O_TRUNC    = 0x10
	BPX_O_APPEND   = 0x08
	BPX_O_NONBLOCK = 0x04
	BPX_FNDELAY    = 0x04

	msg := []byte{
		0x85, 0x9e, 0xef, 0x2f, 0xd7, 0x8a, 0xca, 0x00, 0x30, 0x8b,
		0xdc, 0x47, 0x11, 0x93, 0xbf, 0x55, 0xbf, 0x9d, 0x78, 0xdb,
		0x8f, 0x8a, 0x67, 0x2b, 0x48, 0x46, 0x34, 0xf3, 0xc9, 0xc2,
		0x6e, 0x64, 0x78, 0xae, 0x10, 0x26, 0x0f, 0xe0, 0xdd, 0x8c,
		0x08, 0x2e, 0x53, 0xa5, 0x29, 0x3a, 0xf2, 0x17, 0x3c, 0xd5,
		0x0c, 0x6d, 0x5d, 0x35, 0x4f, 0xeb, 0xf7, 0x8b, 0x26, 0x02,
		0x1c, 0x25, 0xc0, 0x27, 0x12, 0xe7, 0x8c, 0xd4, 0x69, 0x4c,

		Precedence: 1,
		Label:      3,
	},
	{
		// "2001::/32"
		// Teredo
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x01}), 32),
		Precedence: 5,
		Label:      5,
	},
	{
		// "2002::/16"
		// 6to4
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x02}), 16),
		Precedence: 30,
		Label:      2,
	},
	{
		// "3ffe::/16"

	// to how other linkers handle this (for example this code in lld:
	// https://github.com/llvm/llvm-project/blob/2a3a79ce4c2149d7787d56f9841b66cacc9061d0/lld/MachO/Writer.cpp#L524).
	rv[6] &= 0xcf
	rv[6] |= 0x30
	rv[8] &= 0x3f
	rv[8] |= 0xc0

	return rv
}

// machoRewriteUuid copies over the contents of the Macho executable
// exef into the output file outexe, and in the process updates the

var nop = [][16]uint8{
	{0x90},
	{0x66, 0x90},
	{0x0F, 0x1F, 0x00},
	{0x0F, 0x1F, 0x40, 0x00},
	{0x0F, 0x1F, 0x44, 0x00, 0x00},
	{0x66, 0x0F, 0x1F, 0x44, 0x00, 0x00},
	{0x0F, 0x1F, 0x80, 0x00, 0x00, 0x00, 0x00},
	{0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00},
	{0x66, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00},
}

// Native Client rejects the repeated 0x66 prefix.

}

// IsMulticast reports whether ip is a multicast address.
func (ip IP) IsMulticast() bool {
	if ip4 := ip.To4(); ip4 != nil {
		return ip4[0]&0xf0 == 0xe0
	}
	return len(ip) == IPv6len && ip[0] == 0xff
}

// IsInterfaceLocalMulticast reports whether ip is
// an interface-local multicast address.
func (ip IP) IsInterfaceLocalMulticast() bool {

	IP6OPT_MUTABLE                  = 0x20
	IP6OPT_NSAP_ADDR                = 0xc3
	IP6OPT_PAD1                     = 0x00
	IP6OPT_PADN                     = 0x01
	IP6OPT_ROUTER_ALERT             = 0x05
	IP6OPT_TUNNEL_LIMIT             = 0x04
	IP6OPT_TYPE_DISCARD             = 0x40
	IP6OPT_TYPE_FORCEICMP           = 0x80
	IP6OPT_TYPE_ICMP                = 0xc0
	IP6OPT_TYPE_SKIP                = 0x00

	// 15836 bytes of a gzipped FileDescriptorProto
	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xec, 0xbd, 0x69, 0x90, 0x1c, 0xc9,
	0x75, 0x18, 0xcc, 0xea, 0x9e, 0xf3, 0xcd, 0x9d, 0x83, 0x63, 0x30, 0x0b, 0xa0, 0xb1, 0xb5, 0xbb,
	0x58, 0xec, 0x35, 0x20, 0xf6, 0xe0, 0x82, 0xbb, 0xcb, 0x15, 0xe7, 0x04, 0x7a, 0x81, 0x19, 0xf4,
	0x66, 0x0f, 0x00, 0x72, 0xb9, 0xa4, 0x58, 0xe8, 0xce, 0x99, 0x29, 0x4e, 0x77, 0x55, 0x6f, 0x55,