x/net/icmp: new package

This CL makes icmp an external package.

LGTM=iant
R=iant
CC=golang-codereviews
https://golang.org/cl/182370043

18 files changed, 0 insertions, 1189 deletions

diff --git a/internal/icmp/dstunreach.go b/internal/icmp/dstunreach.go
deleted file mode 100644
index 8241017..0000000
--- a/internal/icmp/dstunreach.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-// A DstUnreach represents an ICMP destination unreachable message
-// body.
-type DstUnreach struct {
-	Data []byte // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *DstUnreach) Len() int {
-	if p == nil {
-		return 0
-	}
-	return 4 + len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *DstUnreach) Marshal() ([]byte, error) {
-	b := make([]byte, 4+len(p.Data))
-	copy(b[4:], p.Data)
-	return b, nil
-}
-
-// parseDstUnreach parses b as an ICMP destination unreachable message
-// body.
-func parseDstUnreach(b []byte) (MessageBody, error) {
-	bodyLen := len(b)
-	if bodyLen < 4 {
-		return nil, errMessageTooShort
-	}
-	p := &DstUnreach{}
-	if bodyLen > 4 {
-		p.Data = make([]byte, bodyLen-4)
-		copy(p.Data, b[4:])
-	}
-	return p, nil
-}
diff --git a/internal/icmp/echo.go b/internal/icmp/echo.go
deleted file mode 100644
index dfac9cb..0000000
--- a/internal/icmp/echo.go
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2012 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.
-
-package icmp
-
-// An Echo represents an ICMP echo request or reply message body.
-type Echo struct {
-	ID   int    // identifier
-	Seq  int    // sequence number
-	Data []byte // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *Echo) Len() int {
-	if p == nil {
-		return 0
-	}
-	return 4 + len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *Echo) Marshal() ([]byte, error) {
-	b := make([]byte, 4+len(p.Data))
-	b[0], b[1] = byte(p.ID>>8), byte(p.ID)
-	b[2], b[3] = byte(p.Seq>>8), byte(p.Seq)
-	copy(b[4:], p.Data)
-	return b, nil
-}
-
-// parseEcho parses b as an ICMP echo request or reply message body.
-func parseEcho(b []byte) (MessageBody, error) {
-	bodyLen := len(b)
-	if bodyLen < 4 {
-		return nil, errMessageTooShort
-	}
-	p := &Echo{ID: int(b[0])<<8 | int(b[1]), Seq: int(b[2])<<8 | int(b[3])}
-	if bodyLen > 4 {
-		p.Data = make([]byte, bodyLen-4)
-		copy(p.Data, b[4:])
-	}
-	return p, nil
-}
diff --git a/internal/icmp/endpoint.go b/internal/icmp/endpoint.go
deleted file mode 100644
index 5bf2cfe..0000000
--- a/internal/icmp/endpoint.go
+++ /dev/null
@@ -1,108 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-import (
-	"net"
-	"syscall"
-	"time"
-
-	"golang.org/x/net/ipv4"
-	"golang.org/x/net/ipv6"
-)
-
-var _ net.PacketConn = &PacketConn{}
-
-type ipc interface{}
-
-// A PacketConn represents a packet network endpoint that uses either
-// ICMPv4 or ICMPv6.
-type PacketConn struct {
-	c   net.PacketConn
-	ipc // either ipv4.PacketConn or ipv6.PacketConn
-}
-
-func (c *PacketConn) ok() bool { return c != nil && c.c != nil }
-
-// IPv4PacketConn returns the ipv4.PacketConn of c.
-// It returns nil when c is not created as the endpoint for ICMPv4.
-func (c *PacketConn) IPv4PacketConn() *ipv4.PacketConn {
-	if !c.ok() {
-		return nil
-	}
-	p, _ := c.ipc.(*ipv4.PacketConn)
-	return p
-}
-
-// IPv6PacketConn returns the ipv6.PacketConn of c.
-// It returns nil when c is not created as the endpoint for ICMPv6.
-func (c *PacketConn) IPv6PacketConn() *ipv6.PacketConn {
-	if !c.ok() {
-		return nil
-	}
-	p, _ := c.ipc.(*ipv6.PacketConn)
-	return p
-}
-
-// ReadFrom reads an ICMP message from the connection.
-func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	if !c.ok() {
-		return 0, nil, syscall.EINVAL
-	}
-	return c.c.ReadFrom(b)
-}
-
-// WriteTo writes the ICMP message b to dst.
-// Dst must be net.UDPAddr when c is a non-privileged
-// datagram-oriented ICMP endpoint. Otherwise it must be net.IPAddr.
-func (c *PacketConn) WriteTo(b []byte, dst net.Addr) (int, error) {
-	if !c.ok() {
-		return 0, syscall.EINVAL
-	}
-	return c.c.WriteTo(b, dst)
-}
-
-// Close closes the endpoint.
-func (c *PacketConn) Close() error {
-	if !c.ok() {
-		return syscall.EINVAL
-	}
-	return c.c.Close()
-}
-
-// LocalAddr returns the local network address.
-func (c *PacketConn) LocalAddr() net.Addr {
-	if !c.ok() {
-		return nil
-	}
-	return c.c.LocalAddr()
-}
-
-// SetDeadline sets the read and write deadlines associated with the
-// endpoint.
-func (c *PacketConn) SetDeadline(t time.Time) error {
-	if !c.ok() {
-		return syscall.EINVAL
-	}
-	return c.c.SetDeadline(t)
-}
-
-// SetReadDeadline sets the read deadline associated with the
-// endpoint.
-func (c *PacketConn) SetReadDeadline(t time.Time) error {
-	if !c.ok() {
-		return syscall.EINVAL
-	}
-	return c.c.SetReadDeadline(t)
-}
-
-// SetWriteDeadline sets the write deadline associated with the
-// endpoint.
-func (c *PacketConn) SetWriteDeadline(t time.Time) error {
-	if !c.ok() {
-		return syscall.EINVAL
-	}
-	return c.c.SetWriteDeadline(t)
-}
diff --git a/internal/icmp/example_test.go b/internal/icmp/example_test.go
deleted file mode 100644
index 0ef839c..0000000
--- a/internal/icmp/example_test.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright 2014 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.
-
-package icmp_test
-
-import (
-	"log"
-	"net"
-	"os"
-
-	"golang.org/x/net/internal/iana"
-	"golang.org/x/net/internal/icmp"
-	"golang.org/x/net/ipv6"
-)
-
-func ExamplePacketConn_nonPrivilegedPing() {
-	c, err := icmp.ListenPacket("udp6", "fe80::1%en0")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer c.Close()
-
-	wm := icmp.Message{
-		Type: ipv6.ICMPTypeEchoRequest, Code: 0,
-		Body: &icmp.Echo{
-			ID: os.Getpid() & 0xffff, Seq: 1,
-			Data: []byte("HELLO-R-U-THERE"),
-		},
-	}
-	wb, err := wm.Marshal(nil)
-	if err != nil {
-		log.Fatal(err)
-	}
-	if _, err := c.WriteTo(wb, &net.UDPAddr{IP: net.ParseIP("ff02::1"), Zone: "en0"}); err != nil {
-		log.Fatal(err)
-	}
-
-	rb := make([]byte, 1500)
-	n, peer, err := c.ReadFrom(rb)
-	if err != nil {
-		log.Fatal(err)
-	}
-	rm, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, rb[:n])
-	if err != nil {
-		log.Fatal(err)
-	}
-	switch rm.Type {
-	case ipv6.ICMPTypeEchoReply:
-		log.Printf("got reflection from %v", peer)
-	default:
-		log.Printf("got %+v; want echo reply", rm)
-	}
-}
diff --git a/internal/icmp/helper_unix.go b/internal/icmp/helper_unix.go
deleted file mode 100644
index d3c5529..0000000
--- a/internal/icmp/helper_unix.go
+++ /dev/null
@@ -1,87 +0,0 @@
-// Copyright 2014 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 darwin dragonfly freebsd linux netbsd openbsd solaris
-
-package icmp
-
-import (
-	"net"
-	"syscall"
-)
-
-func sockaddr(family int, address string) (syscall.Sockaddr, error) {
-	switch family {
-	case syscall.AF_INET:
-		a, err := net.ResolveIPAddr("ip4", address)
-		if err != nil {
-			return nil, err
-		}
-		if len(a.IP) == 0 {
-			a.IP = net.IPv4zero
-		}
-		if a.IP = a.IP.To4(); a.IP == nil {
-			return nil, net.InvalidAddrError("non-ipv4 address")
-		}
-		sa := &syscall.SockaddrInet4{}
-		copy(sa.Addr[:], a.IP)
-		return sa, nil
-	case syscall.AF_INET6:
-		a, err := net.ResolveIPAddr("ip6", address)
-		if err != nil {
-			return nil, err
-		}
-		if len(a.IP) == 0 {
-			a.IP = net.IPv6unspecified
-		}
-		if a.IP.Equal(net.IPv4zero) {
-			a.IP = net.IPv6unspecified
-		}
-		if a.IP = a.IP.To16(); a.IP == nil || a.IP.To4() != nil {
-			return nil, net.InvalidAddrError("non-ipv6 address")
-		}
-		sa := &syscall.SockaddrInet6{ZoneId: zoneToUint32(a.Zone)}
-		copy(sa.Addr[:], a.IP)
-		return sa, nil
-	default:
-		return nil, net.InvalidAddrError("unexpected family")
-	}
-}
-
-func zoneToUint32(zone string) uint32 {
-	if zone == "" {
-		return 0
-	}
-	if ifi, err := net.InterfaceByName(zone); err == nil {
-		return uint32(ifi.Index)
-	}
-	n, _, _ := dtoi(zone, 0)
-	return uint32(n)
-}
-
-func last(s string, b byte) int {
-	i := len(s)
-	for i--; i >= 0; i-- {
-		if s[i] == b {
-			break
-		}
-	}
-	return i
-}
-
-const big = 0xFFFFFF
-
-func dtoi(s string, i0 int) (n int, i int, ok bool) {
-	n = 0
-	for i = i0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
-		n = n*10 + int(s[i]-'0')
-		if n >= big {
-			return 0, i, false
-		}
-	}
-	if i == i0 {
-		return 0, i, false
-	}
-	return n, i, true
-}
diff --git a/internal/icmp/ipv4.go b/internal/icmp/ipv4.go
deleted file mode 100644
index a252d73..0000000
--- a/internal/icmp/ipv4.go
+++ /dev/null
@@ -1,61 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-import (
-	"net"
-	"runtime"
-	"unsafe"
-
-	"golang.org/x/net/ipv4"
-)
-
-// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
-var freebsdVersion uint32
-
-// ParseIPv4Header parses b as an IPv4 header of ICMP error message
-// invoking packet, which is contained in ICMP error message.
-func ParseIPv4Header(b []byte) (*ipv4.Header, error) {
-	if len(b) < ipv4.HeaderLen {
-		return nil, errHeaderTooShort
-	}
-	hdrlen := int(b[0]&0x0f) << 2
-	if hdrlen > len(b) {
-		return nil, errBufferTooShort
-	}
-	h := &ipv4.Header{
-		Version:  int(b[0] >> 4),
-		Len:      hdrlen,
-		TOS:      int(b[1]),
-		ID:       int(b[4])<<8 | int(b[5]),
-		FragOff:  int(b[6])<<8 | int(b[7]),
-		TTL:      int(b[8]),
-		Protocol: int(b[9]),
-		Checksum: int(b[10])<<8 | int(b[11]),
-		Src:      net.IPv4(b[12], b[13], b[14], b[15]),
-		Dst:      net.IPv4(b[16], b[17], b[18], b[19]),
-	}
-	switch runtime.GOOS {
-	case "darwin":
-		// TODO(mikio): fix potential misaligned memory access
-		h.TotalLen = int(*(*uint16)(unsafe.Pointer(&b[2:3][0])))
-	case "freebsd":
-		if freebsdVersion >= 1000000 {
-			h.TotalLen = int(b[2])<<8 | int(b[3])
-		} else {
-			// TODO(mikio): fix potential misaligned memory access
-			h.TotalLen = int(*(*uint16)(unsafe.Pointer(&b[2:3][0])))
-		}
-	default:
-		h.TotalLen = int(b[2])<<8 | int(b[3])
-	}
-	h.Flags = ipv4.HeaderFlags(h.FragOff&0xe000) >> 13
-	h.FragOff = h.FragOff & 0x1fff
-	if hdrlen-ipv4.HeaderLen > 0 {
-		h.Options = make([]byte, hdrlen-ipv4.HeaderLen)
-		copy(h.Options, b[ipv4.HeaderLen:])
-	}
-	return h, nil
-}
diff --git a/internal/icmp/ipv4_test.go b/internal/icmp/ipv4_test.go
deleted file mode 100644
index b05c697..0000000
--- a/internal/icmp/ipv4_test.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-import (
-	"net"
-	"reflect"
-	"runtime"
-	"testing"
-
-	"golang.org/x/net/ipv4"
-)
-
-var (
-	wireHeaderFromKernel = [ipv4.HeaderLen]byte{
-		0x45, 0x01, 0xbe, 0xef,
-		0xca, 0xfe, 0x45, 0xdc,
-		0xff, 0x01, 0xde, 0xad,
-		172, 16, 254, 254,
-		192, 168, 0, 1,
-	}
-	wireHeaderFromTradBSDKernel = [ipv4.HeaderLen]byte{
-		0x45, 0x01, 0xef, 0xbe,
-		0xca, 0xfe, 0x45, 0xdc,
-		0xff, 0x01, 0xde, 0xad,
-		172, 16, 254, 254,
-		192, 168, 0, 1,
-	}
-	// TODO(mikio): Add platform dependent wire header formats when
-	// we support new platforms.
-
-	testHeader = &ipv4.Header{
-		Version:  ipv4.Version,
-		Len:      ipv4.HeaderLen,
-		TOS:      1,
-		TotalLen: 0xbeef,
-		ID:       0xcafe,
-		Flags:    ipv4.DontFragment,
-		FragOff:  1500,
-		TTL:      255,
-		Protocol: 1,
-		Checksum: 0xdead,
-		Src:      net.IPv4(172, 16, 254, 254),
-		Dst:      net.IPv4(192, 168, 0, 1),
-	}
-)
-
-func TestParseIPv4Header(t *testing.T) {
-	var wh []byte
-	switch runtime.GOOS {
-	case "darwin":
-		wh = wireHeaderFromTradBSDKernel[:]
-	case "freebsd":
-		if freebsdVersion >= 1000000 {
-			wh = wireHeaderFromKernel[:]
-		} else {
-			wh = wireHeaderFromTradBSDKernel[:]
-		}
-	default:
-		wh = wireHeaderFromKernel[:]
-	}
-	h, err := ParseIPv4Header(wh)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !reflect.DeepEqual(h, testHeader) {
-		t.Fatalf("got %#v; want %#v", h, testHeader)
-	}
-}
diff --git a/internal/icmp/ipv6.go b/internal/icmp/ipv6.go
deleted file mode 100644
index fe4031a..0000000
--- a/internal/icmp/ipv6.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2013 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.
-
-package icmp
-
-import (
-	"net"
-
-	"golang.org/x/net/internal/iana"
-)
-
-const ipv6PseudoHeaderLen = 2*net.IPv6len + 8
-
-// IPv6PseudoHeader returns an IPv6 pseudo header for checkusm
-// calculation.
-func IPv6PseudoHeader(src, dst net.IP) []byte {
-	b := make([]byte, ipv6PseudoHeaderLen)
-	copy(b, src.To16())
-	copy(b[net.IPv6len:], dst.To16())
-	b[len(b)-1] = byte(iana.ProtocolIPv6ICMP)
-	return b
-}
diff --git a/internal/icmp/listen_stub.go b/internal/icmp/listen_stub.go
deleted file mode 100644
index 1a9be6a..0000000
--- a/internal/icmp/listen_stub.go
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2014 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 nacl plan9 windows
-
-package icmp
-
-// ListenPacket listens for incoming ICMP packets addressed to
-// address. See net.Dial for the syntax of address.
-//
-// For non-privileged datagram-oriented ICMP endpoints, network must
-// be "udp4" or "udp6". The endpoint allows to read, write a few
-// limited ICMP messages such as echo request and echo reply.
-// Currently only Dariwn and Linux support this.
-//
-// Examples:
-//	ListenPacket("udp4", "192.168.0.1")
-//	ListenPacket("udp4", "0.0.0.0")
-//	ListenPacket("udp6", "fe80::1%en0")
-//	ListenPacket("udp6", "::")
-//
-// For privileged raw ICMP endpoints, network must be "ip4" or "ip6"
-// followed by a colon and an ICMP protocol number or name.
-//
-// Examples:
-//	ListenPacket("ip4:icmp", "192.168.0.1")
-//	ListenPacket("ip4:1", "0.0.0.0")
-//	ListenPacket("ip6:ipv6-icmp", "fe80::1%en0")
-//	ListenPacket("ip6:58", "::")
-func ListenPacket(network, address string) (*PacketConn, error) {
-	return nil, errOpNoSupport
-}
diff --git a/internal/icmp/listen_unix.go b/internal/icmp/listen_unix.go
deleted file mode 100644
index 5ae9c39..0000000
--- a/internal/icmp/listen_unix.go
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright 2014 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 darwin dragonfly freebsd linux netbsd openbsd solaris
-
-package icmp
-
-import (
-	"net"
-	"os"
-	"runtime"
-	"syscall"
-
-	"golang.org/x/net/internal/iana"
-	"golang.org/x/net/ipv4"
-	"golang.org/x/net/ipv6"
-)
-
-const sysIP_STRIPHDR = 0x17 // for now only darwin supports this option
-
-// ListenPacket listens for incoming ICMP packets addressed to
-// address. See net.Dial for the syntax of address.
-//
-// For non-privileged datagram-oriented ICMP endpoints, network must
-// be "udp4" or "udp6". The endpoint allows to read, write a few
-// limited ICMP messages such as echo request and echo reply.
-// Currently only Dariwn and Linux support this.
-//
-// Examples:
-//	ListenPacket("udp4", "192.168.0.1")
-//	ListenPacket("udp4", "0.0.0.0")
-//	ListenPacket("udp6", "fe80::1%en0")
-//	ListenPacket("udp6", "::")
-//
-// For privileged raw ICMP endpoints, network must be "ip4" or "ip6"
-// followed by a colon and an ICMP protocol number or name.
-//
-// Examples:
-//	ListenPacket("ip4:icmp", "192.168.0.1")
-//	ListenPacket("ip4:1", "0.0.0.0")
-//	ListenPacket("ip6:ipv6-icmp", "fe80::1%en0")
-//	ListenPacket("ip6:58", "::")
-func ListenPacket(network, address string) (*PacketConn, error) {
-	var family, proto int
-	switch network {
-	case "udp4":
-		family, proto = syscall.AF_INET, iana.ProtocolICMP
-	case "udp6":
-		family, proto = syscall.AF_INET6, iana.ProtocolIPv6ICMP
-	default:
-		i := last(network, ':')
-		switch network[:i] {
-		case "ip4":
-			proto = iana.ProtocolICMP
-		case "ip6":
-			proto = iana.ProtocolIPv6ICMP
-		}
-	}
-	var err error
-	var c net.PacketConn
-	switch family {
-	case syscall.AF_INET, syscall.AF_INET6:
-		s, err := syscall.Socket(family, syscall.SOCK_DGRAM, proto)
-		if err != nil {
-			return nil, os.NewSyscallError("socket", err)
-		}
-		defer syscall.Close(s)
-		if runtime.GOOS == "darwin" && family == syscall.AF_INET {
-			if err := syscall.SetsockoptInt(s, iana.ProtocolIP, sysIP_STRIPHDR, 1); err != nil {
-				return nil, os.NewSyscallError("setsockopt", err)
-			}
-		}
-		sa, err := sockaddr(family, address)
-		if err != nil {
-			return nil, err
-		}
-		if err := syscall.Bind(s, sa); err != nil {
-			return nil, os.NewSyscallError("bind", err)
-		}
-		f := os.NewFile(uintptr(s), "datagram-oriented icmp")
-		defer f.Close()
-		c, err = net.FilePacketConn(f)
-	default:
-		c, err = net.ListenPacket(network, address)
-	}
-	if err != nil {
-		return nil, err
-	}
-	switch proto {
-	case iana.ProtocolICMP:
-		return &PacketConn{c: c, ipc: ipv4.NewPacketConn(c)}, nil
-	case iana.ProtocolIPv6ICMP:
-		return &PacketConn{c: c, ipc: ipv6.NewPacketConn(c)}, nil
-	default:
-		return &PacketConn{c: c}, nil
-	}
-}
diff --git a/internal/icmp/message.go b/internal/icmp/message.go
deleted file mode 100644
index 2023dbe..0000000
--- a/internal/icmp/message.go
+++ /dev/null
@@ -1,135 +0,0 @@
-// Copyright 2012 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.
-
-// Package icmp provides basic functions for the manipulation of ICMP
-// message.
-package icmp
-
-import (
-	"errors"
-	"net"
-	"syscall"
-
-	"golang.org/x/net/internal/iana"
-	"golang.org/x/net/ipv4"
-	"golang.org/x/net/ipv6"
-)
-
-var (
-	errMessageTooShort = errors.New("message too short")
-	errHeaderTooShort  = errors.New("header too short")
-	errBufferTooShort  = errors.New("buffer too short")
-	errOpNoSupport     = errors.New("operation not supported")
-)
-
-// A Type represents an ICMP message type.
-type Type interface {
-	Protocol() int
-}
-
-// A Message represents an ICMP message.
-type Message struct {
-	Type     Type        // type, either ipv4.ICMPType or ipv6.ICMPType
-	Code     int         // code
-	Checksum int         // checksum
-	Body     MessageBody // body
-}
-
-// Marshal returns the binary enconding of the ICMP message m.
-//
-// For ICMP for IPv4 message, the returned message always contains the
-// calculated checksum field.
-//
-// For ICMP for IPv6 message, the returned message contains the
-// calculated checksum field when psh is not nil, otherwise the kernel
-// will compute the checksum field during the message transmission.
-// When psh is not nil, it must be the pseudo header for IPv6.
-func (m *Message) Marshal(psh []byte) ([]byte, error) {
-	var mtype int
-	switch typ := m.Type.(type) {
-	case ipv4.ICMPType:
-		mtype = int(typ)
-	case ipv6.ICMPType:
-		mtype = int(typ)
-	default:
-		return nil, syscall.EINVAL
-	}
-	b := []byte{byte(mtype), byte(m.Code), 0, 0}
-	if m.Type.Protocol() == iana.ProtocolIPv6ICMP && psh != nil {
-		b = append(psh, b...)
-	}
-	if m.Body != nil && m.Body.Len() != 0 {
-		mb, err := m.Body.Marshal()
-		if err != nil {
-			return nil, err
-		}
-		b = append(b, mb...)
-	}
-	if m.Type.Protocol() == iana.ProtocolIPv6ICMP {
-		if psh == nil { // cannot calculate checksum here
-			return b, nil
-		}
-		off, l := 2*net.IPv6len, len(b)-len(psh)
-		b[off], b[off+1], b[off+2], b[off+3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l)
-	}
-	csumcv := len(b) - 1 // checksum coverage
-	s := uint32(0)
-	for i := 0; i < csumcv; i += 2 {
-		s += uint32(b[i+1])<<8 | uint32(b[i])
-	}
-	if csumcv&1 == 0 {
-		s += uint32(b[csumcv])
-	}
-	s = s>>16 + s&0xffff
-	s = s + s>>16
-	// Place checksum back in header; using ^= avoids the
-	// assumption the checksum bytes are zero.
-	b[len(psh)+2] ^= byte(^s)
-	b[len(psh)+3] ^= byte(^s >> 8)
-	return b[len(psh):], nil
-}
-
-var parseFns = map[Type]func([]byte) (MessageBody, error){
-	ipv4.ICMPTypeDestinationUnreachable: parseDstUnreach,
-	ipv4.ICMPTypeTimeExceeded:           parseTimeExceeded,
-	ipv4.ICMPTypeParameterProblem:       parseParamProb,
-
-	ipv4.ICMPTypeEcho:      parseEcho,
-	ipv4.ICMPTypeEchoReply: parseEcho,
-
-	ipv6.ICMPTypeDestinationUnreachable: parseDstUnreach,
-	ipv6.ICMPTypePacketTooBig:           parsePacketTooBig,
-	ipv6.ICMPTypeTimeExceeded:           parseTimeExceeded,
-	ipv6.ICMPTypeParameterProblem:       parseParamProb,
-
-	ipv6.ICMPTypeEchoRequest: parseEcho,
-	ipv6.ICMPTypeEchoReply:   parseEcho,
-}
-
-// ParseMessage parses b as an ICMP message.
-// Proto must be either the ICMPv4 or ICMPv6 protocol number.
-func ParseMessage(proto int, b []byte) (*Message, error) {
-	if len(b) < 4 {
-		return nil, errMessageTooShort
-	}
-	var err error
-	m := &Message{Code: int(b[1]), Checksum: int(b[2])<<8 | int(b[3])}
-	switch proto {
-	case iana.ProtocolICMP:
-		m.Type = ipv4.ICMPType(b[0])
-	case iana.ProtocolIPv6ICMP:
-		m.Type = ipv6.ICMPType(b[0])
-	default:
-		return nil, syscall.EINVAL
-	}
-	if fn, ok := parseFns[m.Type]; !ok {
-		m.Body, err = parseDefaultMessageBody(b[4:])
-	} else {
-		m.Body, err = fn(b[4:])
-	}
-	if err != nil {
-		return nil, err
-	}
-	return m, nil
-}
diff --git a/internal/icmp/message_test.go b/internal/icmp/message_test.go
deleted file mode 100644
index cd643e2..0000000
--- a/internal/icmp/message_test.go
+++ /dev/null
@@ -1,134 +0,0 @@
-// Copyright 2014 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.
-
-package icmp_test
-
-import (
-	"net"
-	"reflect"
-	"testing"
-
-	"golang.org/x/net/internal/iana"
-	"golang.org/x/net/internal/icmp"
-	"golang.org/x/net/ipv4"
-	"golang.org/x/net/ipv6"
-)
-
-var marshalAndParseMessageForIPv4Tests = []icmp.Message{
-	{
-		Type: ipv4.ICMPTypeDestinationUnreachable, Code: 15,
-		Body: &icmp.DstUnreach{
-			Data: []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv4.ICMPTypeTimeExceeded, Code: 1,
-		Body: &icmp.TimeExceeded{
-			Data: []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv4.ICMPTypeParameterProblem, Code: 2,
-		Body: &icmp.ParamProb{
-			Pointer: 8,
-			Data:    []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv4.ICMPTypeEcho, Code: 0,
-		Body: &icmp.Echo{
-			ID: 1, Seq: 2,
-			Data: []byte("HELLO-R-U-THERE"),
-		},
-	},
-	{
-		Type: ipv4.ICMPTypePhoturis,
-		Body: &icmp.DefaultMessageBody{
-			Data: []byte{0x80, 0x40, 0x20, 0x10},
-		},
-	},
-}
-
-func TestMarshalAndParseMessageForIPv4(t *testing.T) {
-	for _, tt := range marshalAndParseMessageForIPv4Tests {
-		b, err := tt.Marshal(nil)
-		if err != nil {
-			t.Fatal(err)
-		}
-		m, err := icmp.ParseMessage(iana.ProtocolICMP, b)
-		if err != nil {
-			t.Fatal(err)
-		}
-		if m.Type != tt.Type || m.Code != tt.Code {
-			t.Errorf("got %v; want %v", m, &tt)
-		}
-		if !reflect.DeepEqual(m.Body, tt.Body) {
-			t.Errorf("got %v; want %v", m.Body, tt.Body)
-		}
-	}
-}
-
-var marshalAndParseMessageForIPv6Tests = []icmp.Message{
-	{
-		Type: ipv6.ICMPTypeDestinationUnreachable, Code: 6,
-		Body: &icmp.DstUnreach{
-			Data: []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv6.ICMPTypePacketTooBig, Code: 0,
-		Body: &icmp.PacketTooBig{
-			MTU:  1<<16 - 1,
-			Data: []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv6.ICMPTypeTimeExceeded, Code: 1,
-		Body: &icmp.TimeExceeded{
-			Data: []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv6.ICMPTypeParameterProblem, Code: 2,
-		Body: &icmp.ParamProb{
-			Pointer: 8,
-			Data:    []byte("ERROR-INVOKING-PACKET"),
-		},
-	},
-	{
-		Type: ipv6.ICMPTypeEchoRequest, Code: 0,
-		Body: &icmp.Echo{
-			ID: 1, Seq: 2,
-			Data: []byte("HELLO-R-U-THERE"),
-		},
-	},
-	{
-		Type: ipv6.ICMPTypeDuplicateAddressConfirmation,
-		Body: &icmp.DefaultMessageBody{
-			Data: []byte{0x80, 0x40, 0x20, 0x10},
-		},
-	},
-}
-
-func TestMarshalAndParseMessageForIPv6(t *testing.T) {
-	pshicmp := icmp.IPv6PseudoHeader(net.ParseIP("fe80::1"), net.ParseIP("ff02::1"))
-	for _, tt := range marshalAndParseMessageForIPv6Tests {
-		for _, psh := range [][]byte{pshicmp, nil} {
-			b, err := tt.Marshal(psh)
-			if err != nil {
-				t.Fatal(err)
-			}
-			m, err := icmp.ParseMessage(iana.ProtocolIPv6ICMP, b)
-			if err != nil {
-				t.Fatal(err)
-			}
-			if m.Type != tt.Type || m.Code != tt.Code {
-				t.Errorf("got %v; want %v", m, &tt)
-			}
-			if !reflect.DeepEqual(m.Body, tt.Body) {
-				t.Errorf("got %v; want %v", m.Body, tt.Body)
-			}
-		}
-	}
-}
diff --git a/internal/icmp/messagebody.go b/internal/icmp/messagebody.go
deleted file mode 100644
index f653ab6..0000000
--- a/internal/icmp/messagebody.go
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2012 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.
-
-package icmp
-
-// A MessageBody represents an ICMP message body.
-type MessageBody interface {
-	// Len returns the length of ICMP message body.
-	Len() int
-
-	// Marshal returns the binary enconding of ICMP message body.
-	Marshal() ([]byte, error)
-}
-
-// A DefaultMessageBody represents the default message body.
-type DefaultMessageBody struct {
-	Data []byte // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *DefaultMessageBody) Len() int {
-	if p == nil {
-		return 0
-	}
-	return len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *DefaultMessageBody) Marshal() ([]byte, error) {
-	return p.Data, nil
-}
-
-// parseDefaultMessageBody parses b as an ICMP message body.
-func parseDefaultMessageBody(b []byte) (MessageBody, error) {
-	p := &DefaultMessageBody{Data: make([]byte, len(b))}
-	copy(p.Data, b)
-	return p, nil
-}
diff --git a/internal/icmp/packettoobig.go b/internal/icmp/packettoobig.go
deleted file mode 100644
index fc10192..0000000
--- a/internal/icmp/packettoobig.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-// A PacketTooBig represents an ICMP packet too big message body.
-type PacketTooBig struct {
-	MTU  int    // maximum transmission unit of the nexthop link
-	Data []byte // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *PacketTooBig) Len() int {
-	if p == nil {
-		return 0
-	}
-	return 4 + len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *PacketTooBig) Marshal() ([]byte, error) {
-	b := make([]byte, 4+len(p.Data))
-	b[0], b[1], b[2], b[3] = byte(p.MTU>>24), byte(p.MTU>>16), byte(p.MTU>>8), byte(p.MTU)
-	copy(b[4:], p.Data)
-	return b, nil
-}
-
-// parsePacketTooBig parses b as an ICMP packet too big message body.
-func parsePacketTooBig(b []byte) (MessageBody, error) {
-	bodyLen := len(b)
-	if bodyLen < 4 {
-		return nil, errMessageTooShort
-	}
-	p := &PacketTooBig{MTU: int(b[0])<<24 | int(b[1])<<16 | int(b[2])<<8 | int(b[3])}
-	if bodyLen > 4 {
-		p.Data = make([]byte, bodyLen-4)
-		copy(p.Data, b[4:])
-	}
-	return p, nil
-}
diff --git a/internal/icmp/paramprob.go b/internal/icmp/paramprob.go
deleted file mode 100644
index be32ce0..0000000
--- a/internal/icmp/paramprob.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-// A ParamProb represents an ICMP parameter problem message body.
-type ParamProb struct {
-	Pointer uintptr // offset within the data where the error was detected
-	Data    []byte  // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *ParamProb) Len() int {
-	if p == nil {
-		return 0
-	}
-	return 4 + len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *ParamProb) Marshal() ([]byte, error) {
-	b := make([]byte, 4+len(p.Data))
-	b[0], b[1], b[2], b[3] = byte(p.Pointer>>24), byte(p.Pointer>>16), byte(p.Pointer>>8), byte(p.Pointer)
-	copy(b[4:], p.Data)
-	return b, nil
-}
-
-// parseParamProb parses b as an ICMP parameter problem message body.
-func parseParamProb(b []byte) (MessageBody, error) {
-	bodyLen := len(b)
-	if bodyLen < 4 {
-		return nil, errMessageTooShort
-	}
-	p := &ParamProb{Pointer: uintptr(b[0])<<24 | uintptr(b[1])<<16 | uintptr(b[2])<<8 | uintptr(b[3])}
-	if bodyLen > 4 {
-		p.Data = make([]byte, bodyLen-4)
-		copy(p.Data, b[4:])
-	}
-	return p, nil
-}
diff --git a/internal/icmp/ping_test.go b/internal/icmp/ping_test.go
deleted file mode 100644
index 8d71d6c..0000000
--- a/internal/icmp/ping_test.go
+++ /dev/null
@@ -1,130 +0,0 @@
-// Copyright 2014 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.
-
-package icmp_test
-
-import (
-	"errors"
-	"net"
-	"os"
-	"runtime"
-	"testing"
-
-	"golang.org/x/net/internal/iana"
-	"golang.org/x/net/internal/icmp"
-	"golang.org/x/net/ipv4"
-	"golang.org/x/net/ipv6"
-)
-
-func googleAddr(c *icmp.PacketConn, protocol int) (net.Addr, error) {
-	const host = "www.google.com"
-	ips, err := net.LookupIP(host)
-	if err != nil {
-		return nil, err
-	}
-	netaddr := func(ip net.IP) (net.Addr, error) {
-		switch c.LocalAddr().(type) {
-		case *net.UDPAddr:
-			return &net.UDPAddr{IP: ip}, nil
-		case *net.IPAddr:
-			return &net.IPAddr{IP: ip}, nil
-		default:
-			return nil, errors.New("neither UDPAddr nor IPAddr")
-		}
-	}
-	for _, ip := range ips {
-		switch protocol {
-		case iana.ProtocolICMP:
-			if ip.To4() != nil {
-				return netaddr(ip)
-			}
-		case iana.ProtocolIPv6ICMP:
-			if ip.To16() != nil && ip.To4() == nil {
-				return netaddr(ip)
-			}
-		}
-	}
-	return nil, errors.New("no A or AAAA record")
-}
-
-var pingGoogleTests = []struct {
-	network, address string
-	protocol         int
-	mtype            icmp.Type
-}{
-	{"udp4", "0.0.0.0", iana.ProtocolICMP, ipv4.ICMPTypeEcho},
-	{"ip4:icmp", "0.0.0.0", iana.ProtocolICMP, ipv4.ICMPTypeEcho},
-
-	{"udp6", "::", iana.ProtocolIPv6ICMP, ipv6.ICMPTypeEchoRequest},
-	{"ip6:ipv6-icmp", "::", iana.ProtocolIPv6ICMP, ipv6.ICMPTypeEchoRequest},
-}
-
-func TestPingGoogle(t *testing.T) {
-	if testing.Short() {
-		t.Skip("to avoid external network")
-	}
-	switch runtime.GOOS {
-	case "darwin":
-	case "linux":
-		t.Log("you may need to adjust the net.ipv4.ping_group_range kernel state")
-	default:
-		t.Skipf("not supported on %q", runtime.GOOS)
-	}
-
-	for i, tt := range pingGoogleTests {
-		if tt.network[:2] == "ip" && os.Getuid() != 0 {
-			continue
-		}
-		c, err := icmp.ListenPacket(tt.network, tt.address)
-		if err != nil {
-			t.Error(err)
-			continue
-		}
-		defer c.Close()
-
-		dst, err := googleAddr(c, tt.protocol)
-		if err != nil {
-			t.Error(err)
-			continue
-		}
-
-		wm := icmp.Message{
-			Type: tt.mtype, Code: 0,
-			Body: &icmp.Echo{
-				ID: os.Getpid() & 0xffff, Seq: 1 << uint(i),
-				Data: []byte("HELLO-R-U-THERE"),
-			},
-		}
-		wb, err := wm.Marshal(nil)
-		if err != nil {
-			t.Error(err)
-			continue
-		}
-		if n, err := c.WriteTo(wb, dst); err != nil {
-			t.Error(err, dst)
-			continue
-		} else if n != len(wb) {
-			t.Errorf("got %v; want %v", n, len(wb))
-			continue
-		}
-
-		rb := make([]byte, 1500)
-		n, peer, err := c.ReadFrom(rb)
-		if err != nil {
-			t.Error(err)
-			continue
-		}
-		rm, err := icmp.ParseMessage(tt.protocol, rb[:n])
-		if err != nil {
-			t.Error(err)
-			continue
-		}
-		switch rm.Type {
-		case ipv4.ICMPTypeEchoReply, ipv6.ICMPTypeEchoReply:
-			t.Logf("got reflection from %v", peer)
-		default:
-			t.Errorf("got %+v; want echo reply", rm)
-		}
-	}
-}
diff --git a/internal/icmp/sys_freebsd.go b/internal/icmp/sys_freebsd.go
deleted file mode 100644
index c75f3dd..0000000
--- a/internal/icmp/sys_freebsd.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-import "syscall"
-
-func init() {
-	freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
-}
diff --git a/internal/icmp/timeexceeded.go b/internal/icmp/timeexceeded.go
deleted file mode 100644
index 993a150..0000000
--- a/internal/icmp/timeexceeded.go
+++ /dev/null
@@ -1,39 +0,0 @@
-// Copyright 2014 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.
-
-package icmp
-
-// A TimeExceeded represents an ICMP time exceeded message body.
-type TimeExceeded struct {
-	Data []byte // data
-}
-
-// Len implements the Len method of MessageBody interface.
-func (p *TimeExceeded) Len() int {
-	if p == nil {
-		return 0
-	}
-	return 4 + len(p.Data)
-}
-
-// Marshal implements the Marshal method of MessageBody interface.
-func (p *TimeExceeded) Marshal() ([]byte, error) {
-	b := make([]byte, 4+len(p.Data))
-	copy(b[4:], p.Data)
-	return b, nil
-}
-
-// parseTimeExceeded parses b as an ICMP time exceeded message body.
-func parseTimeExceeded(b []byte) (MessageBody, error) {
-	bodyLen := len(b)
-	if bodyLen < 4 {
-		return nil, errMessageTooShort
-	}
-	p := &TimeExceeded{}
-	if bodyLen > 4 {
-		p.Data = make([]byte, bodyLen-4)
-		copy(p.Data, b[4:])
-	}
-	return p, nil
-}