mirror of
https://github.com/KusakabeShi/EtherGuard-VPN.git
synced 2024-12-28 00:18:48 +01:00
568 lines
10 KiB
Go
568 lines
10 KiB
Go
// +build !android
|
|
|
|
/* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
|
|
*/
|
|
|
|
package conn
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
"strconv"
|
|
"sync"
|
|
"syscall"
|
|
"unsafe"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
type IPv4Source struct {
|
|
Src [4]byte
|
|
Ifindex int32
|
|
}
|
|
|
|
type IPv6Source struct {
|
|
src [16]byte
|
|
//ifindex belongs in dst.ZoneId
|
|
}
|
|
|
|
type NativeEndpoint struct {
|
|
sync.Mutex
|
|
dst [unsafe.Sizeof(unix.SockaddrInet6{})]byte
|
|
src [unsafe.Sizeof(IPv6Source{})]byte
|
|
isV6 bool
|
|
}
|
|
|
|
func (endpoint *NativeEndpoint) Src4() *IPv4Source { return endpoint.src4() }
|
|
func (endpoint *NativeEndpoint) Dst4() *unix.SockaddrInet4 { return endpoint.dst4() }
|
|
func (endpoint *NativeEndpoint) IsV6() bool { return endpoint.isV6 }
|
|
|
|
func (endpoint *NativeEndpoint) src4() *IPv4Source {
|
|
return (*IPv4Source)(unsafe.Pointer(&endpoint.src[0]))
|
|
}
|
|
|
|
func (endpoint *NativeEndpoint) src6() *IPv6Source {
|
|
return (*IPv6Source)(unsafe.Pointer(&endpoint.src[0]))
|
|
}
|
|
|
|
func (endpoint *NativeEndpoint) dst4() *unix.SockaddrInet4 {
|
|
return (*unix.SockaddrInet4)(unsafe.Pointer(&endpoint.dst[0]))
|
|
}
|
|
|
|
func (endpoint *NativeEndpoint) dst6() *unix.SockaddrInet6 {
|
|
return (*unix.SockaddrInet6)(unsafe.Pointer(&endpoint.dst[0]))
|
|
}
|
|
|
|
type nativeBind struct {
|
|
sock4 int
|
|
sock6 int
|
|
lastMark uint32
|
|
closing sync.RWMutex
|
|
}
|
|
|
|
var _ Endpoint = (*NativeEndpoint)(nil)
|
|
var _ Bind = (*nativeBind)(nil)
|
|
|
|
func CreateEndpoint(s string) (Endpoint, error) {
|
|
var end NativeEndpoint
|
|
addr, err := parseEndpoint(s)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ipv4 := addr.IP.To4()
|
|
if ipv4 != nil {
|
|
dst := end.dst4()
|
|
end.isV6 = false
|
|
dst.Port = addr.Port
|
|
copy(dst.Addr[:], ipv4)
|
|
end.ClearSrc()
|
|
return &end, nil
|
|
}
|
|
|
|
ipv6 := addr.IP.To16()
|
|
if ipv6 != nil {
|
|
zone, err := zoneToUint32(addr.Zone)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
dst := end.dst6()
|
|
end.isV6 = true
|
|
dst.Port = addr.Port
|
|
dst.ZoneId = zone
|
|
copy(dst.Addr[:], ipv6[:])
|
|
end.ClearSrc()
|
|
return &end, nil
|
|
}
|
|
|
|
return nil, errors.New("Invalid IP address")
|
|
}
|
|
|
|
func createBind(port uint16) (Bind, uint16, error) {
|
|
var err error
|
|
var bind nativeBind
|
|
var newPort uint16
|
|
|
|
// Attempt ipv6 bind, update port if successful.
|
|
bind.sock6, newPort, err = create6(port)
|
|
if err != nil {
|
|
if err != syscall.EAFNOSUPPORT {
|
|
return nil, 0, err
|
|
}
|
|
} else {
|
|
port = newPort
|
|
}
|
|
|
|
// Attempt ipv4 bind, update port if successful.
|
|
bind.sock4, newPort, err = create4(port)
|
|
if err != nil {
|
|
if err != syscall.EAFNOSUPPORT {
|
|
unix.Close(bind.sock6)
|
|
return nil, 0, err
|
|
}
|
|
} else {
|
|
port = newPort
|
|
}
|
|
|
|
if bind.sock4 == -1 && bind.sock6 == -1 {
|
|
return nil, 0, errors.New("ipv4 and ipv6 not supported")
|
|
}
|
|
|
|
return &bind, port, nil
|
|
}
|
|
|
|
func (bind *nativeBind) LastMark() uint32 {
|
|
return bind.lastMark
|
|
}
|
|
|
|
func (bind *nativeBind) SetMark(value uint32) error {
|
|
bind.closing.RLock()
|
|
defer bind.closing.RUnlock()
|
|
|
|
if bind.sock6 != -1 {
|
|
err := unix.SetsockoptInt(
|
|
bind.sock6,
|
|
unix.SOL_SOCKET,
|
|
unix.SO_MARK,
|
|
int(value),
|
|
)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if bind.sock4 != -1 {
|
|
err := unix.SetsockoptInt(
|
|
bind.sock4,
|
|
unix.SOL_SOCKET,
|
|
unix.SO_MARK,
|
|
int(value),
|
|
)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
bind.lastMark = value
|
|
return nil
|
|
}
|
|
|
|
func (bind *nativeBind) Close() error {
|
|
var err1, err2 error
|
|
bind.closing.RLock()
|
|
if bind.sock6 != -1 {
|
|
unix.Shutdown(bind.sock6, unix.SHUT_RDWR)
|
|
}
|
|
if bind.sock4 != -1 {
|
|
unix.Shutdown(bind.sock4, unix.SHUT_RDWR)
|
|
}
|
|
bind.closing.RUnlock()
|
|
bind.closing.Lock()
|
|
if bind.sock6 != -1 {
|
|
err1 = unix.Close(bind.sock6)
|
|
bind.sock6 = -1
|
|
}
|
|
if bind.sock4 != -1 {
|
|
err2 = unix.Close(bind.sock4)
|
|
bind.sock4 = -1
|
|
}
|
|
bind.closing.Unlock()
|
|
|
|
if err1 != nil {
|
|
return err1
|
|
}
|
|
return err2
|
|
}
|
|
|
|
func (bind *nativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
|
|
bind.closing.RLock()
|
|
defer bind.closing.RUnlock()
|
|
|
|
var end NativeEndpoint
|
|
if bind.sock6 == -1 {
|
|
return 0, nil, NetErrClosed
|
|
}
|
|
n, err := receive6(
|
|
bind.sock6,
|
|
buff,
|
|
&end,
|
|
)
|
|
return n, &end, err
|
|
}
|
|
|
|
func (bind *nativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
|
|
bind.closing.RLock()
|
|
defer bind.closing.RUnlock()
|
|
|
|
var end NativeEndpoint
|
|
if bind.sock4 == -1 {
|
|
return 0, nil, NetErrClosed
|
|
}
|
|
n, err := receive4(
|
|
bind.sock4,
|
|
buff,
|
|
&end,
|
|
)
|
|
return n, &end, err
|
|
}
|
|
|
|
func (bind *nativeBind) Send(buff []byte, end Endpoint) error {
|
|
bind.closing.RLock()
|
|
defer bind.closing.RUnlock()
|
|
|
|
nend := end.(*NativeEndpoint)
|
|
if !nend.isV6 {
|
|
if bind.sock4 == -1 {
|
|
return NetErrClosed
|
|
}
|
|
return send4(bind.sock4, nend, buff)
|
|
} else {
|
|
if bind.sock6 == -1 {
|
|
return NetErrClosed
|
|
}
|
|
return send6(bind.sock6, nend, buff)
|
|
}
|
|
}
|
|
|
|
func (end *NativeEndpoint) SrcIP() net.IP {
|
|
if !end.isV6 {
|
|
return net.IPv4(
|
|
end.src4().Src[0],
|
|
end.src4().Src[1],
|
|
end.src4().Src[2],
|
|
end.src4().Src[3],
|
|
)
|
|
} else {
|
|
return end.src6().src[:]
|
|
}
|
|
}
|
|
|
|
func (end *NativeEndpoint) DstIP() net.IP {
|
|
if !end.isV6 {
|
|
return net.IPv4(
|
|
end.dst4().Addr[0],
|
|
end.dst4().Addr[1],
|
|
end.dst4().Addr[2],
|
|
end.dst4().Addr[3],
|
|
)
|
|
} else {
|
|
return end.dst6().Addr[:]
|
|
}
|
|
}
|
|
|
|
func (end *NativeEndpoint) DstToBytes() []byte {
|
|
if !end.isV6 {
|
|
return (*[unsafe.Offsetof(end.dst4().Addr) + unsafe.Sizeof(end.dst4().Addr)]byte)(unsafe.Pointer(end.dst4()))[:]
|
|
} else {
|
|
return (*[unsafe.Offsetof(end.dst6().Addr) + unsafe.Sizeof(end.dst6().Addr)]byte)(unsafe.Pointer(end.dst6()))[:]
|
|
}
|
|
}
|
|
|
|
func (end *NativeEndpoint) SrcToString() string {
|
|
return end.SrcIP().String()
|
|
}
|
|
|
|
func (end *NativeEndpoint) DstToString() string {
|
|
var udpAddr net.UDPAddr
|
|
udpAddr.IP = end.DstIP()
|
|
if !end.isV6 {
|
|
udpAddr.Port = end.dst4().Port
|
|
} else {
|
|
udpAddr.Port = end.dst6().Port
|
|
}
|
|
return udpAddr.String()
|
|
}
|
|
|
|
func (end *NativeEndpoint) ClearDst() {
|
|
for i := range end.dst {
|
|
end.dst[i] = 0
|
|
}
|
|
}
|
|
|
|
func (end *NativeEndpoint) ClearSrc() {
|
|
for i := range end.src {
|
|
end.src[i] = 0
|
|
}
|
|
}
|
|
|
|
func zoneToUint32(zone string) (uint32, error) {
|
|
if zone == "" {
|
|
return 0, nil
|
|
}
|
|
if intr, err := net.InterfaceByName(zone); err == nil {
|
|
return uint32(intr.Index), nil
|
|
}
|
|
n, err := strconv.ParseUint(zone, 10, 32)
|
|
return uint32(n), err
|
|
}
|
|
|
|
func create4(port uint16) (int, uint16, error) {
|
|
|
|
// create socket
|
|
|
|
fd, err := unix.Socket(
|
|
unix.AF_INET,
|
|
unix.SOCK_DGRAM,
|
|
0,
|
|
)
|
|
|
|
if err != nil {
|
|
return -1, 0, err
|
|
}
|
|
|
|
addr := unix.SockaddrInet4{
|
|
Port: int(port),
|
|
}
|
|
|
|
// set sockopts and bind
|
|
|
|
if err := func() error {
|
|
if err := unix.SetsockoptInt(
|
|
fd,
|
|
unix.IPPROTO_IP,
|
|
unix.IP_PKTINFO,
|
|
1,
|
|
); err != nil {
|
|
return err
|
|
}
|
|
|
|
return unix.Bind(fd, &addr)
|
|
}(); err != nil {
|
|
unix.Close(fd)
|
|
return -1, 0, err
|
|
}
|
|
|
|
sa, err := unix.Getsockname(fd)
|
|
if err == nil {
|
|
addr.Port = sa.(*unix.SockaddrInet4).Port
|
|
}
|
|
|
|
return fd, uint16(addr.Port), err
|
|
}
|
|
|
|
func create6(port uint16) (int, uint16, error) {
|
|
|
|
// create socket
|
|
|
|
fd, err := unix.Socket(
|
|
unix.AF_INET6,
|
|
unix.SOCK_DGRAM,
|
|
0,
|
|
)
|
|
|
|
if err != nil {
|
|
return -1, 0, err
|
|
}
|
|
|
|
// set sockopts and bind
|
|
|
|
addr := unix.SockaddrInet6{
|
|
Port: int(port),
|
|
}
|
|
|
|
if err := func() error {
|
|
if err := unix.SetsockoptInt(
|
|
fd,
|
|
unix.IPPROTO_IPV6,
|
|
unix.IPV6_RECVPKTINFO,
|
|
1,
|
|
); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := unix.SetsockoptInt(
|
|
fd,
|
|
unix.IPPROTO_IPV6,
|
|
unix.IPV6_V6ONLY,
|
|
1,
|
|
); err != nil {
|
|
return err
|
|
}
|
|
|
|
return unix.Bind(fd, &addr)
|
|
|
|
}(); err != nil {
|
|
unix.Close(fd)
|
|
return -1, 0, err
|
|
}
|
|
|
|
sa, err := unix.Getsockname(fd)
|
|
if err == nil {
|
|
addr.Port = sa.(*unix.SockaddrInet6).Port
|
|
}
|
|
|
|
return fd, uint16(addr.Port), err
|
|
}
|
|
|
|
func send4(sock int, end *NativeEndpoint, buff []byte) error {
|
|
|
|
// construct message header
|
|
|
|
cmsg := struct {
|
|
cmsghdr unix.Cmsghdr
|
|
pktinfo unix.Inet4Pktinfo
|
|
}{
|
|
unix.Cmsghdr{
|
|
Level: unix.IPPROTO_IP,
|
|
Type: unix.IP_PKTINFO,
|
|
Len: unix.SizeofInet4Pktinfo + unix.SizeofCmsghdr,
|
|
},
|
|
unix.Inet4Pktinfo{
|
|
Spec_dst: end.src4().Src,
|
|
Ifindex: end.src4().Ifindex,
|
|
},
|
|
}
|
|
|
|
end.Lock()
|
|
_, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
|
|
end.Unlock()
|
|
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
|
|
// clear src and retry
|
|
|
|
if err == unix.EINVAL {
|
|
end.ClearSrc()
|
|
cmsg.pktinfo = unix.Inet4Pktinfo{}
|
|
end.Lock()
|
|
_, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
|
|
end.Unlock()
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func send6(sock int, end *NativeEndpoint, buff []byte) error {
|
|
|
|
// construct message header
|
|
|
|
cmsg := struct {
|
|
cmsghdr unix.Cmsghdr
|
|
pktinfo unix.Inet6Pktinfo
|
|
}{
|
|
unix.Cmsghdr{
|
|
Level: unix.IPPROTO_IPV6,
|
|
Type: unix.IPV6_PKTINFO,
|
|
Len: unix.SizeofInet6Pktinfo + unix.SizeofCmsghdr,
|
|
},
|
|
unix.Inet6Pktinfo{
|
|
Addr: end.src6().src,
|
|
Ifindex: end.dst6().ZoneId,
|
|
},
|
|
}
|
|
|
|
if cmsg.pktinfo.Addr == [16]byte{} {
|
|
cmsg.pktinfo.Ifindex = 0
|
|
}
|
|
|
|
end.Lock()
|
|
_, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
|
|
end.Unlock()
|
|
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
|
|
// clear src and retry
|
|
|
|
if err == unix.EINVAL {
|
|
end.ClearSrc()
|
|
cmsg.pktinfo = unix.Inet6Pktinfo{}
|
|
end.Lock()
|
|
_, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
|
|
end.Unlock()
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func receive4(sock int, buff []byte, end *NativeEndpoint) (int, error) {
|
|
|
|
// construct message header
|
|
|
|
var cmsg struct {
|
|
cmsghdr unix.Cmsghdr
|
|
pktinfo unix.Inet4Pktinfo
|
|
}
|
|
|
|
size, _, _, newDst, err := unix.Recvmsg(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], 0)
|
|
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
end.isV6 = false
|
|
|
|
if newDst4, ok := newDst.(*unix.SockaddrInet4); ok {
|
|
*end.dst4() = *newDst4
|
|
}
|
|
|
|
// update source cache
|
|
|
|
if cmsg.cmsghdr.Level == unix.IPPROTO_IP &&
|
|
cmsg.cmsghdr.Type == unix.IP_PKTINFO &&
|
|
cmsg.cmsghdr.Len >= unix.SizeofInet4Pktinfo {
|
|
end.src4().Src = cmsg.pktinfo.Spec_dst
|
|
end.src4().Ifindex = cmsg.pktinfo.Ifindex
|
|
}
|
|
|
|
return size, nil
|
|
}
|
|
|
|
func receive6(sock int, buff []byte, end *NativeEndpoint) (int, error) {
|
|
|
|
// construct message header
|
|
|
|
var cmsg struct {
|
|
cmsghdr unix.Cmsghdr
|
|
pktinfo unix.Inet6Pktinfo
|
|
}
|
|
|
|
size, _, _, newDst, err := unix.Recvmsg(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], 0)
|
|
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
end.isV6 = true
|
|
|
|
if newDst6, ok := newDst.(*unix.SockaddrInet6); ok {
|
|
*end.dst6() = *newDst6
|
|
}
|
|
|
|
// update source cache
|
|
|
|
if cmsg.cmsghdr.Level == unix.IPPROTO_IPV6 &&
|
|
cmsg.cmsghdr.Type == unix.IPV6_PKTINFO &&
|
|
cmsg.cmsghdr.Len >= unix.SizeofInet6Pktinfo {
|
|
end.src6().src = cmsg.pktinfo.Addr
|
|
end.dst6().ZoneId = cmsg.pktinfo.Ifindex
|
|
}
|
|
|
|
return size, nil
|
|
}
|