lif: new package

This change introduces a package that provides basic functions for the
manipulation of logical network interfaces, interface addresses and
data links on Solaris.

As BSD variants implement routing socket and routing messages, Linux
implements netlink socket and netlink messages, Solaris implements
STREAMS-like interface for reading, writing network facility
information inside the kernel. The package wraps various I/O control
calls which involve message exchanges between kernel protocol modules
in exposed APIs.

At present, the package supports Solaris 11 or above.

Updates golang/go#7177.

Change-Id: I192d85e53b0bee942dfefca0f73a3eb94ab8bfe9
Reviewed-on: https://go-review.googlesource.com/29893Reviewed-by: Ian Lance Taylor <iant@golang.org>

lif/address.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+import (
+	"errors"
+	"unsafe"
+)
+
+// An Addr represents an address associated with packet routing.
+type Addr interface {
+	// Family returns an address family.
+	Family() int
+}
+
+// An Inet4Addr represents an internet address for IPv4.
+type Inet4Addr struct {
+	IP        [4]byte // IP address
+	PrefixLen int     // address prefix length
+}
+
+// Family implements the Family method of Addr interface.
+func (a *Inet4Addr) Family() int { return sysAF_INET }
+
+// An Inet6Addr represents an internet address for IPv6.
+type Inet6Addr struct {
+	IP        [16]byte // IP address
+	PrefixLen int      // address prefix length
+	ZoneID    int      // zone identifier
+}
+
+// Family implements the Family method of Addr interface.
+func (a *Inet6Addr) Family() int { return sysAF_INET6 }
+
+// Addrs returns a list of interface addresses.
+//
+// The provided af must be an address family and name must be a data
+// link name. The zero value of af or name means a wildcard.
+func Addrs(af int, name string) ([]Addr, error) {
+	eps, err := newEndpoints(af)
+	if len(eps) == 0 {
+		return nil, err
+	}
+	defer func() {
+		for _, ep := range eps {
+			ep.close()
+		}
+	}()
+	lls, err := links(eps, name)
+	if len(lls) == 0 {
+		return nil, err
+	}
+	var as []Addr
+	for _, ll := range lls {
+		var lifr sysLifreq
+		for i := 0; i < len(ll.Name); i++ {
+			lifr.Name[i] = int8(ll.Name[i])
+		}
+		for _, ep := range eps {
+			ioc := int64(sysSIOCGLIFADDR)
+			err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifr))
+			if err != nil {
+				continue
+			}
+			sa := (*sysSockaddrStorage)(unsafe.Pointer(&lifr.Lifru[0]))
+			l := int(littleEndian.Uint32(lifr.Lifru1[:4]))
+			if l == 0 {
+				continue
+			}
+			switch sa.Family {
+			case sysAF_INET:
+				a := &Inet4Addr{PrefixLen: l}
+				copy(a.IP[:], lifr.Lifru[4:8])
+				as = append(as, a)
+			case sysAF_INET6:
+				a := &Inet6Addr{PrefixLen: l, ZoneID: int(littleEndian.Uint32(lifr.Lifru[24:28]))}
+				copy(a.IP[:], lifr.Lifru[8:24])
+				as = append(as, a)
+			}
+		}
+	}
+	return as, nil
+}
+
+func parseLinkAddr(b []byte) ([]byte, error) {
+	nlen, alen, slen := int(b[1]), int(b[2]), int(b[3])
+	l := 4 + nlen + alen + slen
+	if len(b) < l {
+		return nil, errors.New("invalid address")
+	}
+	b = b[4:]
+	var addr []byte
+	if nlen > 0 {
+		b = b[nlen:]
+	}
+	if alen > 0 {
+		addr = make([]byte, alen)
+		copy(addr, b[:alen])
+	}
+	return addr, nil
+}

lif/address_test.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+import (
+	"fmt"
+	"testing"
+)
+
+type addrFamily int
+
+func (af addrFamily) String() string {
+	switch af {
+	case sysAF_UNSPEC:
+		return "unspec"
+	case sysAF_INET:
+		return "inet4"
+	case sysAF_INET6:
+		return "inet6"
+	default:
+		return fmt.Sprintf("%d", af)
+	}
+}
+
+const hexDigit = "0123456789abcdef"
+
+type llAddr []byte
+
+func (a llAddr) String() string {
+	if len(a) == 0 {
+		return ""
+	}
+	buf := make([]byte, 0, len(a)*3-1)
+	for i, b := range a {
+		if i > 0 {
+			buf = append(buf, ':')
+		}
+		buf = append(buf, hexDigit[b>>4])
+		buf = append(buf, hexDigit[b&0xF])
+	}
+	return string(buf)
+}
+
+type ipAddr []byte
+
+func (a ipAddr) String() string {
+	if len(a) == 0 {
+		return "<nil>"
+	}
+	if len(a) == 4 {
+		return fmt.Sprintf("%d.%d.%d.%d", a[0], a[1], a[2], a[3])
+	}
+	if len(a) == 16 {
+		return fmt.Sprintf("%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x", a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15])
+	}
+	s := make([]byte, len(a)*2)
+	for i, tn := range a {
+		s[i*2], s[i*2+1] = hexDigit[tn>>4], hexDigit[tn&0xf]
+	}
+	return string(s)
+}
+
+func (a *Inet4Addr) String() string {
+	return fmt.Sprintf("(%s %s %d)", addrFamily(a.Family()), ipAddr(a.IP[:]), a.PrefixLen)
+}
+
+func (a *Inet6Addr) String() string {
+	return fmt.Sprintf("(%s %s %d %d)", addrFamily(a.Family()), ipAddr(a.IP[:]), a.PrefixLen, a.ZoneID)
+}
+
+type addrPack struct {
+	af int
+	as []Addr
+}
+
+func addrPacks() ([]addrPack, error) {
+	var aps []addrPack
+	for _, af := range [...]int{sysAF_UNSPEC, sysAF_INET, sysAF_INET6} {
+		as, err := Addrs(af, "")
+		if err != nil {
+			return nil, err
+		}
+		aps = append(aps, addrPack{af: af, as: as})
+	}
+	return aps, nil
+}
+
+func TestAddrs(t *testing.T) {
+	aps, err := addrPacks()
+	if len(aps) == 0 && err != nil {
+		t.Fatal(err)
+	}
+	lps, err := linkPacks()
+	if len(lps) == 0 && err != nil {
+		t.Fatal(err)
+	}
+	for _, lp := range lps {
+		n := 0
+		for _, ll := range lp.lls {
+			as, err := Addrs(lp.af, ll.Name)
+			if err != nil {
+				t.Fatal(lp.af, ll.Name, err)
+			}
+			t.Logf("af=%s name=%s %v", addrFamily(lp.af), ll.Name, as)
+			n += len(as)
+		}
+		for _, ap := range aps {
+			if ap.af != lp.af {
+				continue
+			}
+			if n != len(ap.as) {
+				t.Errorf("af=%s got %d; want %d", addrFamily(lp.af), n, len(ap.as))
+				continue
+			}
+		}
+	}
+}

lif/binary.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+// This file contains duplicates of encoding/binary package.
+//
+// This package is supposed to be used by the net package of standard
+// library. Therefore the package set used in the package must be the
+// same as net package.
+
+var littleEndian binaryLittleEndian
+
+type binaryByteOrder interface {
+	Uint16([]byte) uint16
+	Uint32([]byte) uint32
+	Uint64([]byte) uint64
+	PutUint16([]byte, uint16)
+	PutUint32([]byte, uint32)
+	PutUint64([]byte, uint64)
+}
+
+type binaryLittleEndian struct{}
+
+func (binaryLittleEndian) Uint16(b []byte) uint16 {
+	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint16(b[0]) | uint16(b[1])<<8
+}
+
+func (binaryLittleEndian) PutUint16(b []byte, v uint16) {
+	_ = b[1] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+}
+
+func (binaryLittleEndian) Uint32(b []byte) uint32 {
+	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}
+
+func (binaryLittleEndian) PutUint32(b []byte, v uint32) {
+	_ = b[3] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+}
+
+func (binaryLittleEndian) Uint64(b []byte) uint64 {
+	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
+
+func (binaryLittleEndian) PutUint64(b []byte, v uint64) {
+	_ = b[7] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v)
+	b[1] = byte(v >> 8)
+	b[2] = byte(v >> 16)
+	b[3] = byte(v >> 24)
+	b[4] = byte(v >> 32)
+	b[5] = byte(v >> 40)
+	b[6] = byte(v >> 48)
+	b[7] = byte(v >> 56)
+}

lif/defs_solaris.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// +godefs map struct_in_addr [4]byte /* in_addr */
+// +godefs map struct_in6_addr [16]byte /* in6_addr */
+
+package lif
+
+/*
+#include <sys/socket.h>
+#include <sys/sockio.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+*/
+import "C"
+
+const (
+	sysAF_UNSPEC = C.AF_UNSPEC
+	sysAF_INET   = C.AF_INET
+	sysAF_INET6  = C.AF_INET6
+
+	sysSOCK_DGRAM = C.SOCK_DGRAM
+)
+
+type sysSockaddrStorage C.struct_sockaddr_storage
+
+const (
+	sysLIFC_NOXMIT          = C.LIFC_NOXMIT
+	sysLIFC_EXTERNAL_SOURCE = C.LIFC_EXTERNAL_SOURCE
+	sysLIFC_TEMPORARY       = C.LIFC_TEMPORARY
+	sysLIFC_ALLZONES        = C.LIFC_ALLZONES
+	sysLIFC_UNDER_IPMP      = C.LIFC_UNDER_IPMP
+	sysLIFC_ENABLED         = C.LIFC_ENABLED
+
+	sysSIOCGLIFADDR    = C.SIOCGLIFADDR
+	sysSIOCGLIFDSTADDR = C.SIOCGLIFDSTADDR
+	sysSIOCGLIFFLAGS   = C.SIOCGLIFFLAGS
+	sysSIOCGLIFMTU     = C.SIOCGLIFMTU
+	sysSIOCGLIFNETMASK = C.SIOCGLIFNETMASK
+	sysSIOCGLIFMETRIC  = C.SIOCGLIFMETRIC
+	sysSIOCGLIFNUM     = C.SIOCGLIFNUM
+	sysSIOCGLIFINDEX   = C.SIOCGLIFINDEX
+	sysSIOCGLIFSUBNET  = C.SIOCGLIFSUBNET
+	sysSIOCGLIFLNKINFO = C.SIOCGLIFLNKINFO
+	sysSIOCGLIFCONF    = C.SIOCGLIFCONF
+	sysSIOCGLIFHWADDR  = C.SIOCGLIFHWADDR
+)
+
+const (
+	sysIFF_UP          = C.IFF_UP
+	sysIFF_BROADCAST   = C.IFF_BROADCAST
+	sysIFF_DEBUG       = C.IFF_DEBUG
+	sysIFF_LOOPBACK    = C.IFF_LOOPBACK
+	sysIFF_POINTOPOINT = C.IFF_POINTOPOINT
+	sysIFF_NOTRAILERS  = C.IFF_NOTRAILERS
+	sysIFF_RUNNING     = C.IFF_RUNNING
+	sysIFF_NOARP       = C.IFF_NOARP
+	sysIFF_PROMISC     = C.IFF_PROMISC
+	sysIFF_ALLMULTI    = C.IFF_ALLMULTI
+	sysIFF_INTELLIGENT = C.IFF_INTELLIGENT
+	sysIFF_MULTICAST   = C.IFF_MULTICAST
+	sysIFF_MULTI_BCAST = C.IFF_MULTI_BCAST
+	sysIFF_UNNUMBERED  = C.IFF_UNNUMBERED
+	sysIFF_PRIVATE     = C.IFF_PRIVATE
+)
+
+const (
+	sizeofLifnum       = C.sizeof_struct_lifnum
+	sizeofLifreq       = C.sizeof_struct_lifreq
+	sizeofLifconf      = C.sizeof_struct_lifconf
+	sizeofLifIfinfoReq = C.sizeof_struct_lif_ifinfo_req
+)
+
+type sysLifnum C.struct_lifnum
+
+type sysLifreq C.struct_lifreq
+
+type sysLifconf C.struct_lifconf
+
+type sysLifIfinfoReq C.struct_lif_ifinfo_req
+
+const (
+	sysIFT_IPV4 = C.IFT_IPV4
+	sysIFT_IPV6 = C.IFT_IPV6
+	sysIFT_6TO4 = C.IFT_6TO4
+)

lif/lif.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+// Package lif provides basic functions for the manipulation of
+// logical network interfaces and interface addresses on Solaris.
+//
+// The package supports Solaris 11 or above.
+package lif
+
+import "syscall"
+
+type endpoint struct {
+	af int
+	s  uintptr
+}
+
+func (ep *endpoint) close() error {
+	return syscall.Close(int(ep.s))
+}
+
+func newEndpoints(af int) ([]endpoint, error) {
+	var lastErr error
+	var eps []endpoint
+	afs := []int{sysAF_INET, sysAF_INET6}
+	if af != sysAF_UNSPEC {
+		afs = []int{af}
+	}
+	for _, af := range afs {
+		s, err := syscall.Socket(af, sysSOCK_DGRAM, 0)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+		eps = append(eps, endpoint{af: af, s: uintptr(s)})
+	}
+	if len(eps) == 0 {
+		return nil, lastErr
+	}
+	return eps, nil
+}

lif/link.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+import "unsafe"
+
+// A Link represents logical data link information.
+//
+// It also represents base information for logical network interface.
+// On Solaris, each logical network interface represents network layer
+// adjacency information and the interface has a only single network
+// address or address pair for tunneling. It's usual that multiple
+// logical network interfaces share the same logical data link.
+type Link struct {
+	Name  string // name, equivalent to IP interface name
+	Index int    // index, equivalent to IP interface index
+	Type  int    // type
+	Flags int    // flags
+	MTU   int    // maximum transmission unit, basically link MTU but may differ between IP address families
+	Addr  []byte // address
+}
+
+func (ll *Link) fetch(s uintptr) {
+	var lifr sysLifreq
+	for i := 0; i < len(ll.Name); i++ {
+		lifr.Name[i] = int8(ll.Name[i])
+	}
+	ioc := int64(sysSIOCGLIFINDEX)
+	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
+		ll.Index = int(littleEndian.Uint32(lifr.Lifru[:4]))
+	}
+	ioc = int64(sysSIOCGLIFFLAGS)
+	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
+		ll.Flags = int(littleEndian.Uint64(lifr.Lifru[:8]))
+	}
+	ioc = int64(sysSIOCGLIFMTU)
+	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
+		ll.MTU = int(littleEndian.Uint32(lifr.Lifru[:4]))
+	}
+	switch ll.Type {
+	case sysIFT_IPV4, sysIFT_IPV6, sysIFT_6TO4:
+	default:
+		ioc = int64(sysSIOCGLIFHWADDR)
+		if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
+			ll.Addr, _ = parseLinkAddr(lifr.Lifru[4:])
+		}
+	}
+}
+
+// Links returns a list of logical data links.
+//
+// The provided af must be an address family and name must be a data
+// link name. The zero value of af or name means a wildcard.
+func Links(af int, name string) ([]Link, error) {
+	eps, err := newEndpoints(af)
+	if len(eps) == 0 {
+		return nil, err
+	}
+	defer func() {
+		for _, ep := range eps {
+			ep.close()
+		}
+	}()
+	return links(eps, name)
+}
+
+func links(eps []endpoint, name string) ([]Link, error) {
+	var lls []Link
+	lifn := sysLifnum{Flags: sysLIFC_NOXMIT | sysLIFC_TEMPORARY | sysLIFC_ALLZONES | sysLIFC_UNDER_IPMP}
+	lifc := sysLifconf{Flags: sysLIFC_NOXMIT | sysLIFC_TEMPORARY | sysLIFC_ALLZONES | sysLIFC_UNDER_IPMP}
+	for _, ep := range eps {
+		lifn.Family = uint16(ep.af)
+		ioc := int64(sysSIOCGLIFNUM)
+		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifn)); err != nil {
+			continue
+		}
+		if lifn.Count == 0 {
+			continue
+		}
+		b := make([]byte, lifn.Count*sizeofLifreq)
+		lifc.Family = uint16(ep.af)
+		lifc.Len = lifn.Count * sizeofLifreq
+		littleEndian.PutUint64(lifc.Lifcu[:], uint64(uintptr(unsafe.Pointer(&b[0]))))
+		ioc = int64(sysSIOCGLIFCONF)
+		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifc)); err != nil {
+			continue
+		}
+		nb := make([]byte, 32) // see LIFNAMSIZ in net/if.h
+		for i := 0; i < int(lifn.Count); i++ {
+			lifr := (*sysLifreq)(unsafe.Pointer(&b[i*sizeofLifreq]))
+			for i := 0; i < 32; i++ {
+				if lifr.Name[i] == 0 {
+					nb = nb[:i]
+					break
+				}
+				nb[i] = byte(lifr.Name[i])
+			}
+			llname := string(nb)
+			nb = nb[:32]
+			if isDupLink(lls, llname) || name != "" && name != llname {
+				continue
+			}
+			ll := Link{Name: llname, Type: int(lifr.Type)}
+			ll.fetch(ep.s)
+			lls = append(lls, ll)
+		}
+	}
+	return lls, nil
+}
+
+func isDupLink(lls []Link, name string) bool {
+	for _, ll := range lls {
+		if ll.Name == name {
+			return true
+		}
+	}
+	return false
+}

lif/link_test.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+import (
+	"fmt"
+	"testing"
+)
+
+func (ll *Link) String() string {
+	return fmt.Sprintf("name=%s index=%d type=%d flags=%#x mtu=%d addr=%v", ll.Name, ll.Index, ll.Type, ll.Flags, ll.MTU, llAddr(ll.Addr))
+}
+
+type linkPack struct {
+	af  int
+	lls []Link
+}
+
+func linkPacks() ([]linkPack, error) {
+	var lps []linkPack
+	for _, af := range [...]int{sysAF_UNSPEC, sysAF_INET, sysAF_INET6} {
+		lls, err := Links(af, "")
+		if err != nil {
+			return nil, err
+		}
+		lps = append(lps, linkPack{af: af, lls: lls})
+	}
+	return lps, nil
+}
+
+func TestLinks(t *testing.T) {
+	lps, err := linkPacks()
+	if len(lps) == 0 && err != nil {
+		t.Fatal(err)
+	}
+	for _, lp := range lps {
+		n := 0
+		for _, sll := range lp.lls {
+			lls, err := Links(lp.af, sll.Name)
+			if err != nil {
+				t.Fatal(lp.af, sll.Name, err)
+			}
+			for _, ll := range lls {
+				if ll.Name != sll.Name || ll.Index != sll.Index {
+					t.Errorf("af=%s got %v; want %v", addrFamily(lp.af), &ll, &sll)
+					continue
+				}
+				t.Logf("af=%s name=%s %v", addrFamily(lp.af), sll.Name, &ll)
+				n++
+			}
+		}
+		if n != len(lp.lls) {
+			t.Errorf("af=%s got %d; want %d", addrFamily(lp.af), n, len(lp.lls))
+			continue
+		}
+	}
+}

lif/sys_solaris_amd64.s

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT ·sysvicall6(SB),NOSPLIT,$0-88
+	JMP	syscall·sysvicall6(SB)
+
+TEXT ·keepAlive(SB),NOSPLIT,$0
+	RET

lif/syscall.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package lif
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+//go:cgo_import_dynamic libc_ioctl ioctl "libc.so"
+
+//go:linkname procIoctl libc_ioctl
+
+var procIoctl uintptr
+
+func sysvicall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (uintptr, uintptr, syscall.Errno)
+
+// TODO: replace with runtime.KeepAlive when available
+//go:noescape
+func keepAlive(p unsafe.Pointer)
+
+func ioctl(s, ioc uintptr, arg unsafe.Pointer) error {
+	_, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procIoctl)), 3, s, ioc, uintptr(arg), 0, 0, 0)
+	keepAlive(arg)
+	if errno != 0 {
+		return error(errno)
+	}
+	return nil
+}

lif/zsys_solaris_amd64.go

+// Created by cgo -godefs - DO NOT EDIT
+// cgo -godefs defs_solaris.go
+
+package lif
+
+const (
+	sysAF_UNSPEC = 0x0
+	sysAF_INET   = 0x2
+	sysAF_INET6  = 0x1a
+
+	sysSOCK_DGRAM = 0x1
+)
+
+type sysSockaddrStorage struct {
+	Family     uint16
+	X_ss_pad1  [6]int8
+	X_ss_align float64
+	X_ss_pad2  [240]int8
+}
+
+const (
+	sysLIFC_NOXMIT          = 0x1
+	sysLIFC_EXTERNAL_SOURCE = 0x2
+	sysLIFC_TEMPORARY       = 0x4
+	sysLIFC_ALLZONES        = 0x8
+	sysLIFC_UNDER_IPMP      = 0x10
+	sysLIFC_ENABLED         = 0x20
+
+	sysSIOCGLIFADDR    = -0x3f87968f
+	sysSIOCGLIFDSTADDR = -0x3f87968d
+	sysSIOCGLIFFLAGS   = -0x3f87968b
+	sysSIOCGLIFMTU     = -0x3f879686
+	sysSIOCGLIFNETMASK = -0x3f879683
+	sysSIOCGLIFMETRIC  = -0x3f879681
+	sysSIOCGLIFNUM     = -0x3ff3967e
+	sysSIOCGLIFINDEX   = -0x3f87967b
+	sysSIOCGLIFSUBNET  = -0x3f879676
+	sysSIOCGLIFLNKINFO = -0x3f879674
+	sysSIOCGLIFCONF    = -0x3fef965b
+	sysSIOCGLIFHWADDR  = -0x3f879640
+)
+
+const (
+	sysIFF_UP          = 0x1
+	sysIFF_BROADCAST   = 0x2
+	sysIFF_DEBUG       = 0x4
+	sysIFF_LOOPBACK    = 0x8
+	sysIFF_POINTOPOINT = 0x10
+	sysIFF_NOTRAILERS  = 0x20
+	sysIFF_RUNNING     = 0x40
+	sysIFF_NOARP       = 0x80
+	sysIFF_PROMISC     = 0x100
+	sysIFF_ALLMULTI    = 0x200
+	sysIFF_INTELLIGENT = 0x400
+	sysIFF_MULTICAST   = 0x800
+	sysIFF_MULTI_BCAST = 0x1000
+	sysIFF_UNNUMBERED  = 0x2000
+	sysIFF_PRIVATE     = 0x8000
+)
+
+const (
+	sizeofLifnum       = 0xc
+	sizeofLifreq       = 0x178
+	sizeofLifconf      = 0x18
+	sizeofLifIfinfoReq = 0x10
+)
+
+type sysLifnum struct {
+	Family    uint16
+	Pad_cgo_0 [2]byte
+	Flags     int32
+	Count     int32
+}
+
+type sysLifreq struct {
+	Name   [32]int8
+	Lifru1 [4]byte
+	Type   uint32
+	Lifru  [336]byte
+}
+
+type sysLifconf struct {
+	Family    uint16
+	Pad_cgo_0 [2]byte
+	Flags     int32
+	Len       int32
+	Pad_cgo_1 [4]byte
+	Lifcu     [8]byte
+}
+
+type sysLifIfinfoReq struct {
+	Maxhops      uint8
+	Pad_cgo_0    [3]byte
+	Reachtime    uint32
+	Reachretrans uint32
+	Maxmtu       uint32
+}
+
+const (
+	sysIFT_IPV4 = 0xc8
+	sysIFT_IPV6 = 0xc9
+	sysIFT_6TO4 = 0xca
+)