Xray-core/proxy/wireguard/tun.go

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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2022 WireGuard LLC. All Rights Reserved.
*/
package wireguard
import (
"context"
"fmt"
"net"
"net/netip"
"os"
"github.com/sagernet/wireguard-go/tun"
"github.com/xtls/xray-core/features/dns"
"gvisor.dev/gvisor/pkg/bufferv2"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/channel"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
)
type netTun struct {
ep *channel.Endpoint
stack *stack.Stack
events chan tun.Event
incomingPacket chan *bufferv2.View
mtu int
dnsClient dns.Client
hasV4, hasV6 bool
}
type Net netTun
func CreateNetTUN(localAddresses []netip.Addr, dnsClient dns.Client, mtu int) (tun.Device, *Net, error) {
opts := stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol},
HandleLocal: true,
}
dev := &netTun{
ep: channel.New(1024, uint32(mtu), ""),
stack: stack.New(opts),
events: make(chan tun.Event, 10),
incomingPacket: make(chan *bufferv2.View),
dnsClient: dnsClient,
mtu: mtu,
}
dev.ep.AddNotify(dev)
tcpipErr := dev.stack.CreateNIC(1, dev.ep)
if tcpipErr != nil {
return nil, nil, fmt.Errorf("CreateNIC: %v", tcpipErr)
}
for _, ip := range localAddresses {
var protoNumber tcpip.NetworkProtocolNumber
if ip.Is4() {
protoNumber = ipv4.ProtocolNumber
} else if ip.Is6() {
protoNumber = ipv6.ProtocolNumber
}
protoAddr := tcpip.ProtocolAddress{
Protocol: protoNumber,
AddressWithPrefix: tcpip.Address(ip.AsSlice()).WithPrefix(),
}
tcpipErr := dev.stack.AddProtocolAddress(1, protoAddr, stack.AddressProperties{})
if tcpipErr != nil {
return nil, nil, fmt.Errorf("AddProtocolAddress(%v): %v", ip, tcpipErr)
}
if ip.Is4() {
dev.hasV4 = true
} else if ip.Is6() {
dev.hasV6 = true
}
}
if dev.hasV4 {
dev.stack.AddRoute(tcpip.Route{Destination: header.IPv4EmptySubnet, NIC: 1})
}
if dev.hasV6 {
dev.stack.AddRoute(tcpip.Route{Destination: header.IPv6EmptySubnet, NIC: 1})
}
dev.events <- tun.EventUp
return dev, (*Net)(dev), nil
}
func (tun *netTun) Name() (string, error) {
return "go", nil
}
func (tun *netTun) File() *os.File {
return nil
}
func (tun *netTun) Events() chan tun.Event {
return tun.events
}
func (tun *netTun) Read(buf []byte, offset int) (int, error) {
view, ok := <-tun.incomingPacket
if !ok {
return 0, os.ErrClosed
}
return view.Read(buf[offset:])
}
func (tun *netTun) Write(buf []byte, offset int) (int, error) {
packet := buf[offset:]
if len(packet) == 0 {
return 0, nil
}
pkb := stack.NewPacketBuffer(stack.PacketBufferOptions{Payload: bufferv2.MakeWithData(packet)})
switch packet[0] >> 4 {
case 4:
tun.ep.InjectInbound(header.IPv4ProtocolNumber, pkb)
case 6:
tun.ep.InjectInbound(header.IPv6ProtocolNumber, pkb)
}
return len(buf), nil
}
func (tun *netTun) WriteNotify() {
pkt := tun.ep.Read()
if pkt == nil {
return
}
view := pkt.ToView()
pkt.DecRef()
tun.incomingPacket <- view
}
func (tun *netTun) Flush() error {
return nil
}
func (tun *netTun) Close() error {
tun.stack.RemoveNIC(1)
if tun.events != nil {
close(tun.events)
}
tun.ep.Close()
if tun.incomingPacket != nil {
close(tun.incomingPacket)
}
return nil
}
func (tun *netTun) MTU() (int, error) {
return tun.mtu, nil
}
func convertToFullAddr(endpoint netip.AddrPort) (tcpip.FullAddress, tcpip.NetworkProtocolNumber) {
var protoNumber tcpip.NetworkProtocolNumber
if endpoint.Addr().Is4() {
protoNumber = ipv4.ProtocolNumber
} else {
protoNumber = ipv6.ProtocolNumber
}
return tcpip.FullAddress{
NIC: 1,
Addr: tcpip.Address(endpoint.Addr().AsSlice()),
Port: endpoint.Port(),
}, protoNumber
}
func (net *Net) DialContextTCPAddrPort(ctx context.Context, addr netip.AddrPort) (*gonet.TCPConn, error) {
fa, pn := convertToFullAddr(addr)
return gonet.DialContextTCP(ctx, net.stack, fa, pn)
}
func (net *Net) DialContextTCP(ctx context.Context, addr *net.TCPAddr) (*gonet.TCPConn, error) {
if addr == nil {
return net.DialContextTCPAddrPort(ctx, netip.AddrPort{})
}
ip, _ := netip.AddrFromSlice(addr.IP)
return net.DialContextTCPAddrPort(ctx, netip.AddrPortFrom(ip, uint16(addr.Port)))
}
func (net *Net) DialTCPAddrPort(addr netip.AddrPort) (*gonet.TCPConn, error) {
fa, pn := convertToFullAddr(addr)
return gonet.DialTCP(net.stack, fa, pn)
}
func (net *Net) DialTCP(addr *net.TCPAddr) (*gonet.TCPConn, error) {
if addr == nil {
return net.DialTCPAddrPort(netip.AddrPort{})
}
ip, _ := netip.AddrFromSlice(addr.IP)
return net.DialTCPAddrPort(netip.AddrPortFrom(ip, uint16(addr.Port)))
}
func (net *Net) ListenTCPAddrPort(addr netip.AddrPort) (*gonet.TCPListener, error) {
fa, pn := convertToFullAddr(addr)
return gonet.ListenTCP(net.stack, fa, pn)
}
func (net *Net) ListenTCP(addr *net.TCPAddr) (*gonet.TCPListener, error) {
if addr == nil {
return net.ListenTCPAddrPort(netip.AddrPort{})
}
ip, _ := netip.AddrFromSlice(addr.IP)
return net.ListenTCPAddrPort(netip.AddrPortFrom(ip, uint16(addr.Port)))
}
func (net *Net) DialUDPAddrPort(laddr, raddr netip.AddrPort) (*gonet.UDPConn, error) {
var lfa, rfa *tcpip.FullAddress
var pn tcpip.NetworkProtocolNumber
if laddr.IsValid() || laddr.Port() > 0 {
var addr tcpip.FullAddress
addr, pn = convertToFullAddr(laddr)
lfa = &addr
}
if raddr.IsValid() || raddr.Port() > 0 {
var addr tcpip.FullAddress
addr, pn = convertToFullAddr(raddr)
rfa = &addr
}
return gonet.DialUDP(net.stack, lfa, rfa, pn)
}
func (net *Net) ListenUDPAddrPort(laddr netip.AddrPort) (*gonet.UDPConn, error) {
return net.DialUDPAddrPort(laddr, netip.AddrPort{})
}
func (net *Net) DialUDP(laddr, raddr *net.UDPAddr) (*gonet.UDPConn, error) {
var la, ra netip.AddrPort
if laddr != nil {
ip, _ := netip.AddrFromSlice(laddr.IP)
la = netip.AddrPortFrom(ip, uint16(laddr.Port))
}
if raddr != nil {
ip, _ := netip.AddrFromSlice(raddr.IP)
ra = netip.AddrPortFrom(ip, uint16(raddr.Port))
}
return net.DialUDPAddrPort(la, ra)
}
func (net *Net) ListenUDP(laddr *net.UDPAddr) (*gonet.UDPConn, error) {
return net.DialUDP(laddr, nil)
}
func (n *Net) HasV4() bool {
return n.hasV4
}
func (n *Net) HasV6() bool {
return n.hasV6
}
func IsDomainName(s string) bool {
l := len(s)
if l == 0 || l > 254 || l == 254 && s[l-1] != '.' {
return false
}
last := byte('.')
nonNumeric := false
partlen := 0
for i := 0; i < len(s); i++ {
c := s[i]
switch {
default:
return false
case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
nonNumeric = true
partlen++
case '0' <= c && c <= '9':
partlen++
case c == '-':
if last == '.' {
return false
}
partlen++
nonNumeric = true
case c == '.':
if last == '.' || last == '-' {
return false
}
if partlen > 63 || partlen == 0 {
return false
}
partlen = 0
}
last = c
}
if last == '-' || partlen > 63 {
return false
}
return nonNumeric
}