vendor: update golang_org/x/net/lif package

Update the lif package to rev 7bf7a75.

Introduce the following changes:
 - 7bf7a75 lif: use of nativeEndian to make API endian agnostic
 - adc6ba9 lif: drop support for go1.5

Updates #19967

Change-Id: Iaba893b5ee9af4c54bf5ba4244ce5752ce9f6ad3
Reviewed-on: https://go-review.googlesource.com/40831Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/vendor/golang_org/x/net/lif/address.go

@@ -67,7 +67,7 @@ func Addrs(af int, name string) ([]Addr, error) {
 				continue
 			}
 			sa := (*sockaddrStorage)(unsafe.Pointer(&lifr.Lifru[0]))
-			l := int(littleEndian.Uint32(lifr.Lifru1[:4]))
+			l := int(nativeEndian.Uint32(lifr.Lifru1[:4]))
 			if l == 0 {
 				continue
 			}
@@ -77,7 +77,7 @@ func Addrs(af int, name string) ([]Addr, error) {
 				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]))}
+				a := &Inet6Addr{PrefixLen: l, ZoneID: int(nativeEndian.Uint32(lifr.Lifru[24:28]))}
 				copy(a.IP[:], lifr.Lifru[8:24])
 				as = append(as, a)
 			}

src/vendor/golang_org/x/net/lif/binary.go

@@ -12,7 +12,10 @@ package lif
 // library. Therefore the package set used in the package must be the
 // same as net package.
 
-var littleEndian binaryLittleEndian
+var (
+	littleEndian binaryLittleEndian
+	bigEndian    binaryBigEndian
+)
 
 type binaryByteOrder interface {
 	Uint16([]byte) uint16
@@ -66,3 +69,47 @@ func (binaryLittleEndian) PutUint64(b []byte, v uint64) {
 	b[6] = byte(v >> 48)
 	b[7] = byte(v >> 56)
 }
+
+type binaryBigEndian struct{}
+
+func (binaryBigEndian) Uint16(b []byte) uint16 {
+	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint16(b[1]) | uint16(b[0])<<8
+}
+
+func (binaryBigEndian) PutUint16(b []byte, v uint16) {
+	_ = b[1] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v >> 8)
+	b[1] = byte(v)
+}
+
+func (binaryBigEndian) Uint32(b []byte) uint32 {
+	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
+}
+
+func (binaryBigEndian) PutUint32(b []byte, v uint32) {
+	_ = b[3] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v >> 24)
+	b[1] = byte(v >> 16)
+	b[2] = byte(v >> 8)
+	b[3] = byte(v)
+}
+
+func (binaryBigEndian) Uint64(b []byte) uint64 {
+	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
+	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
+		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
+}
+
+func (binaryBigEndian) PutUint64(b []byte, v uint64) {
+	_ = b[7] // early bounds check to guarantee safety of writes below
+	b[0] = byte(v >> 56)
+	b[1] = byte(v >> 48)
+	b[2] = byte(v >> 40)
+	b[3] = byte(v >> 32)
+	b[4] = byte(v >> 24)
+	b[5] = byte(v >> 16)
+	b[6] = byte(v >> 8)
+	b[7] = byte(v)
+}

src/vendor/golang_org/x/net/lif/link.go

@@ -31,15 +31,15 @@ func (ll *Link) fetch(s uintptr) {
 	}
 	ioc := int64(sysSIOCGLIFINDEX)
 	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
-		ll.Index = int(littleEndian.Uint32(lifr.Lifru[:4]))
+		ll.Index = int(nativeEndian.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]))
+		ll.Flags = int(nativeEndian.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]))
+		ll.MTU = int(nativeEndian.Uint32(lifr.Lifru[:4]))
 	}
 	switch ll.Type {
 	case sysIFT_IPV4, sysIFT_IPV6, sysIFT_6TO4:
@@ -84,7 +84,11 @@ func links(eps []endpoint, name string) ([]Link, error) {
 		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]))))
+		if len(lifc.Lifcu) == 8 {
+			nativeEndian.PutUint64(lifc.Lifcu[:], uint64(uintptr(unsafe.Pointer(&b[0]))))
+		} else {
+			nativeEndian.PutUint32(lifc.Lifcu[:], uint32(uintptr(unsafe.Pointer(&b[0]))))
+		}
 		ioc = int64(sysSIOCGLIFCONF)
 		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifc)); err != nil {
 			continue

src/vendor/golang_org/x/net/lif/sys.go

+// Copyright 2017 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"
+
+var nativeEndian binaryByteOrder
+
+func init() {
+	i := uint32(1)
+	b := (*[4]byte)(unsafe.Pointer(&i))
+	if b[0] == 1 {
+		nativeEndian = littleEndian
+	} else {
+		nativeEndian = bigEndian
+	}
+}

src/vendor/golang_org/x/net/lif/sys_solaris_amd64.s

@@ -6,6 +6,3 @@
 
 TEXT ·sysvicall6(SB),NOSPLIT,$0-88
 	JMP	syscall·sysvicall6(SB)
-
-TEXT ·keepAlive(SB),NOSPLIT,$0
-	RET

src/vendor/golang_org/x/net/lif/syscall.go

@@ -19,13 +19,8 @@ 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)
 	}