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tun: support IPv6

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This commit is contained in:
ginuerzh 2020-01-03 20:29:07 +08:00
parent 8e914c87e0
commit 267885f1b4
7 changed files with 179 additions and 99 deletions
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1
go.mod
View File

@ -33,7 +33,6 @@ require (
github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735
github.com/shadowsocks/go-shadowsocks2 v0.0.11
github.com/shadowsocks/shadowsocks-go v0.0.0-20170121203516-97a5c71f80ba
github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091
github.com/songgao/water v0.0.0-20190725173103-fd331bda3f4b
github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b // indirect

2
go.sum
View File

@ -69,8 +69,6 @@ github.com/shadowsocks/go-shadowsocks2 v0.0.11 h1:dXloqEhYnZV40jblWTK8kWeC0Eb+dg
github.com/shadowsocks/go-shadowsocks2 v0.0.11/go.mod h1:R+KWaoIwRRhnpw6XV+dZil0XHi64Hc1D7hXUyXTjUzQ=
github.com/shadowsocks/shadowsocks-go v0.0.0-20170121203516-97a5c71f80ba h1:tJgNXb3S+RkB4kNPi6N5OmEWe3m+Y3Qs6LUMiNDAONM=
github.com/shadowsocks/shadowsocks-go v0.0.0-20170121203516-97a5c71f80ba/go.mod h1:mttDPaeLm87u74HMrP+n2tugXvIKWcwff/cqSX0lehY=
github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091 h1:1zN6ImoqhSJhN8hGXFaJlSC8msLmIbX8bFqOfWLKw0w=
github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091/go.mod h1:N20Z5Y8oye9a7HmytmZ+tr8Q2vlP0tAHP13kTHzwvQY=
github.com/songgao/water v0.0.0-20190725173103-fd331bda3f4b h1:+y4hCMc/WKsDbAPsOQZgBSaSZ26uh2afyaWeVg/3s/c=
github.com/songgao/water v0.0.0-20190725173103-fd331bda3f4b/go.mod h1:P5HUIBuIWKbyjl083/loAegFkfbFNx5i2qEP4CNbm7E=
github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 h1:89CEmDvlq/F7SJEOqkIdNDGJXrQIhuIx9D2DBXjavSU=

243
tuntap.go
View File

@ -3,6 +3,7 @@ package gost
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"os"
@ -11,13 +12,31 @@ import (
"github.com/go-log/log"
"github.com/shadowsocks/go-shadowsocks2/core"
"github.com/songgao/packets/ethernet"
"github.com/songgao/water"
"github.com/songgao/water/waterutil"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
)
var mIPProts = map[waterutil.IPProtocol]string{
waterutil.HOPOPT: "HOPOPT",
waterutil.ICMP: "ICMP",
waterutil.IGMP: "IGMP",
waterutil.GGP: "GGP",
waterutil.TCP: "TCP",
waterutil.UDP: "UDP",
waterutil.IPv6_Route: "IPv6-Route",
waterutil.IPv6_Frag: "IPv6-Frag",
waterutil.IPv6_ICMP: "IPv6-ICMP",
}
func ipProtocol(p waterutil.IPProtocol) string {
if v, ok := mIPProts[p]; ok {
return v
}
return fmt.Sprintf("unknown(%d)", p)
}
type TunConfig struct {
Name string
Addr string
@ -25,10 +44,17 @@ type TunConfig struct {
Routes []string
}
type tunRouteKey [16]byte
func ipToTunRouteKey(ip net.IP) (key tunRouteKey) {
copy(key[:], ip.To16())
return
}
type tunHandler struct {
raddr string
options *HandlerOptions
ipNet *net.IPNet
ifce *net.Interface
routes sync.Map
}
@ -71,7 +97,9 @@ func (h *tunHandler) Handle(conn net.Conn) {
}
defer tc.Close()
log.Logf("[tun] %s - %s: tun creation successful", tc.LocalAddr(), conn.LocalAddr())
addrs, _ := h.ifce.Addrs()
log.Logf("[tun] %s - %s: name: %s, mtu: %d, addrs: %s",
tc.LocalAddr(), conn.LocalAddr(), h.ifce.Name, h.ifce.MTU, addrs)
var raddr net.Addr
if h.raddr != "" {
@ -96,7 +124,7 @@ func (h *tunHandler) Handle(conn net.Conn) {
}
func (h *tunHandler) createTun() (conn net.Conn, err error) {
conn, h.ipNet, err = createTun(h.options.TunConfig)
conn, h.ifce, err = createTun(h.options.TunConfig)
return
}
@ -114,41 +142,52 @@ func (h *tunHandler) transportTun(tun net.Conn, conn net.PacketConn, raddr net.A
return err
}
header, err := ipv4.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s: %v", tun.LocalAddr(), err)
var src, dst net.IP
if waterutil.IsIPv4(b[:n]) {
header, err := ipv4.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s: %v", tun.LocalAddr(), err)
return nil
}
if Debug {
log.Logf("[tun] %s -> %s %-4s %d/%-4d %-4x %d",
header.Src, header.Dst, ipProtocol(waterutil.IPv4Protocol(b[:n])),
header.Len, header.TotalLen, header.ID, header.Flags)
}
src, dst = header.Src, header.Dst
} else if waterutil.IsIPv6(b[:n]) {
header, err := ipv6.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s: %v", tun.LocalAddr(), err)
return nil
}
if Debug {
log.Logf("[tun] %s -> %s %s %d %d",
header.Src, header.Dst,
ipProtocol(waterutil.IPProtocol(header.NextHeader)),
header.PayloadLen, header.TrafficClass)
}
src, dst = header.Src, header.Dst
} else {
log.Logf("[tun] unknown packet")
return nil
}
// client side, deliver packet directly.
if raddr != nil {
_, err := conn.WriteTo(b[:n], raddr)
return err
}
if header.Version != ipv4.Version {
if Debug && header.Version == ipv6.Version {
if hdr, _ := ipv6.ParseHeader(b[:n]); hdr != nil {
log.Logf("[tun] %s: %s -> %s %d %d",
tun.LocalAddr(), hdr.Src, hdr.Dst, hdr.PayloadLen, hdr.TrafficClass)
}
}
log.Logf("[tun] %s: v%d ignored, only support ipv4",
tun.LocalAddr(), header.Version)
return nil
}
addr := raddr
if v, ok := h.routes.Load(header.Dst.String()); ok {
var addr net.Addr
if v, ok := h.routes.Load(ipToTunRouteKey(dst)); ok {
addr = v.(net.Addr)
}
if addr == nil {
log.Logf("[tun] %s: no route for %s -> %s %d/%d %x %d %d",
tun.LocalAddr(), header.Src, header.Dst,
header.Len, header.TotalLen, header.ID, header.Flags, header.Protocol)
log.Logf("[tun] no route for %s -> %s", src, dst)
return nil
}
if Debug {
log.Logf("[tun] %s >>> %s: %s -> %s %d/%d %x %d %d",
tun.LocalAddr(), addr, header.Src, header.Dst,
header.Len, header.TotalLen, header.ID, header.Flags, header.Protocol)
}
if _, err := conn.WriteTo(b[:n], addr); err != nil {
return err
}
@ -173,40 +212,60 @@ func (h *tunHandler) transportTun(tun net.Conn, conn net.PacketConn, raddr net.A
return err
}
header, err := ipv4.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s <- %s: %v", tun.LocalAddr(), addr, err)
return err
}
if header.Version != ipv4.Version {
if Debug && header.Version == ipv6.Version {
if hdr, _ := ipv6.ParseHeader(b[:n]); hdr != nil {
log.Logf("[tun] %s <<< %s: %s -> %s %d %d",
tun.LocalAddr(), addr, hdr.Src, hdr.Dst, hdr.PayloadLen, hdr.TrafficClass)
}
var src, dst net.IP
if waterutil.IsIPv4(b[:n]) {
header, err := ipv4.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s: %v", tun.LocalAddr(), err)
return nil
}
log.Logf("[tun] %s <- %s: v%d ignored, only support ipv4",
tun.LocalAddr(), addr, header.Version)
if Debug {
log.Logf("[tun] %s -> %s %-4s %d/%-4d %-4x %d",
header.Src, header.Dst, ipProtocol(waterutil.IPv4Protocol(b[:n])),
header.Len, header.TotalLen, header.ID, header.Flags)
}
src, dst = header.Src, header.Dst
} else if waterutil.IsIPv6(b[:n]) {
header, err := ipv6.ParseHeader(b[:n])
if err != nil {
log.Logf("[tun] %s: %v", tun.LocalAddr(), err)
return nil
}
if Debug {
log.Logf("[tun] %s -> %s %s %d %d",
header.Src, header.Dst,
ipProtocol(waterutil.IPProtocol(header.NextHeader)),
header.PayloadLen, header.TrafficClass)
}
src, dst = header.Src, header.Dst
} else {
log.Logf("[tun] unknown packet")
return nil
}
if Debug {
log.Logf("[tun] %s <<< %s: %s -> %s %d/%d %x %d %d",
tun.LocalAddr(), addr, header.Src, header.Dst,
header.Len, header.TotalLen, header.ID, header.Flags, header.Protocol)
// client side, deliver packet to tun device.
if raddr != nil {
_, err := tun.Write(b[:n])
return err
}
if h.ipNet != nil && h.ipNet.IP.Equal(header.Src.Mask(h.ipNet.Mask)) {
if actual, loaded := h.routes.LoadOrStore(header.Src.String(), addr); loaded {
if actual.(net.Addr).String() != addr.String() {
log.Logf("[tun] %s <- %s: update route: %s -> %s (old %s)",
tun.LocalAddr(), addr, header.Src, addr, actual.(net.Addr))
h.routes.Store(header.Src.String(), addr)
}
} else {
log.Logf("[tun] %s: new route: %s -> %s", tun.LocalAddr(), header.Src, addr)
rkey := ipToTunRouteKey(src)
if actual, loaded := h.routes.LoadOrStore(rkey, addr); loaded {
if actual.(net.Addr).String() != addr.String() {
log.Logf("[tun] update route: %s -> %s (old %s)",
src, addr, actual.(net.Addr))
h.routes.Store(rkey, addr)
}
} else {
log.Logf("[tun] new route: %s -> %s", src, addr)
}
if v, ok := h.routes.Load(ipToTunRouteKey(dst)); ok {
if Debug {
log.Logf("[tun] find route: %s -> %s", dst, v)
}
_, err := conn.WriteTo(b[:n], v.(net.Addr))
return err
}
if _, err := tun.Write(b[:n]); err != nil {
@ -285,14 +344,14 @@ func (l *tunListener) Close() error {
return nil
}
var mEtherTypes = map[ethernet.Ethertype]string{
ethernet.IPv4: "ip",
ethernet.ARP: "arp",
ethernet.RARP: "rarp",
ethernet.IPv6: "ip6",
var mEtherTypes = map[waterutil.Ethertype]string{
waterutil.IPv4: "ip",
waterutil.ARP: "arp",
waterutil.RARP: "rarp",
waterutil.IPv6: "ip6",
}
func etherType(et ethernet.Ethertype) string {
func etherType(et waterutil.Ethertype) string {
if s, ok := mEtherTypes[et]; ok {
return s
}
@ -360,7 +419,7 @@ func (h *tapHandler) Handle(conn net.Conn) {
defer tc.Close()
addrs, _ := h.ifce.Addrs()
log.Logf("[tap] %s - %s: name: %s, mac: %s, mtu: %d, addr: %s",
log.Logf("[tap] %s - %s: name: %s, mac: %s, mtu: %d, addrs: %s",
tc.LocalAddr(), conn.LocalAddr(),
h.ifce.Name, h.ifce.HardwareAddr, h.ifce.MTU, addrs)
@ -405,22 +464,23 @@ func (h *tapHandler) transportTap(tap net.Conn, conn net.PacketConn, raddr net.A
return err
}
frame := ethernet.Frame(b[:n])
src := waterutil.MACSource(b[:n])
dst := waterutil.MACDestination(b[:n])
eType := etherType(waterutil.MACEthertype(b[:n]))
if Debug {
log.Logf("[tap] %s -> %s %s %d",
frame.Source(), frame.Destination(), etherType(frame.Ethertype()), n)
log.Logf("[tap] %s -> %s %s %d", src, dst, eType, n)
}
// client side delivers frame directly.
// client side, deliver frame directly.
if raddr != nil {
_, err := conn.WriteTo(b[:n], raddr)
return err
}
// server side broadcast.
if waterutil.IsBroadcast(frame.Destination()) {
h.routes.Range(func(k, v interface{}) bool {
// server side, broadcast.
if waterutil.IsBroadcast(dst) {
go h.routes.Range(func(k, v interface{}) bool {
conn.WriteTo(b[:n], v.(net.Addr))
return true
})
@ -428,12 +488,11 @@ func (h *tapHandler) transportTap(tap net.Conn, conn net.PacketConn, raddr net.A
}
var addr net.Addr
if v, ok := h.routes.Load(hwAddrToTapRouteKey(frame.Destination())); ok {
if v, ok := h.routes.Load(hwAddrToTapRouteKey(dst)); ok {
addr = v.(net.Addr)
}
if addr == nil {
log.Logf("[tap] no route for %s -> %s %s %d",
frame.Source(), frame.Destination(), etherType(frame.Ethertype()), n)
log.Logf("[tap] no route for %s -> %s %s %d", src, dst, eType, n)
return nil
}
@ -461,18 +520,18 @@ func (h *tapHandler) transportTap(tap net.Conn, conn net.PacketConn, raddr net.A
return err
}
frame := ethernet.Frame(b[:n])
src := waterutil.MACSource(b[:n])
dst := waterutil.MACDestination(b[:n])
eType := etherType(waterutil.MACEthertype(b[:n]))
// ignore the frame send by myself
if bytes.Equal(frame.Source(), h.ifce.HardwareAddr) {
log.Logf("[tap] %s -> %s %s %d ignored",
frame.Source(), frame.Destination(), etherType(frame.Ethertype()), n)
if bytes.Equal(src, h.ifce.HardwareAddr) {
log.Logf("[tap] %s -> %s %s %d ignored", src, dst, eType, n)
return nil
}
if Debug {
log.Logf("[tap] %s -> %s %s %d",
frame.Source(), frame.Destination(), etherType(frame.Ethertype()), n)
log.Logf("[tap] %s -> %s %s %d", src, dst, eType, n)
}
// client side, deliver frame to tap device.
@ -482,30 +541,30 @@ func (h *tapHandler) transportTap(tap net.Conn, conn net.PacketConn, raddr net.A
}
// server side, record route.
rkey := hwAddrToTapRouteKey(frame.Source())
rkey := hwAddrToTapRouteKey(src)
if actual, loaded := h.routes.LoadOrStore(rkey, addr); loaded {
if actual.(net.Addr).String() != addr.String() {
log.Logf("[tap] update route: %s -> %s (old %s)",
frame.Source(), addr, actual.(net.Addr))
src, addr, actual.(net.Addr))
h.routes.Store(rkey, addr)
}
} else {
log.Logf("[tap] new route: %s -> %s",
frame.Source(), addr)
log.Logf("[tap] new route: %s -> %s", src, addr)
}
if waterutil.IsBroadcast(frame.Destination()) {
h.routes.Range(func(k, v interface{}) bool {
if k.(tapRouteKey) != hwAddrToTapRouteKey(frame.Source()) {
if waterutil.IsBroadcast(dst) {
go h.routes.Range(func(k, v interface{}) bool {
if k.(tapRouteKey) != rkey {
conn.WriteTo(b[:n], v.(net.Addr))
}
return true
})
}
if v, ok := h.routes.Load(hwAddrToTapRouteKey(frame.Destination())); ok {
log.Logf("[tap] find route: %s -> %s",
frame.Destination(), v)
if v, ok := h.routes.Load(hwAddrToTapRouteKey(dst)); ok {
if Debug {
log.Logf("[tap] find route: %s -> %s", dst, v)
}
_, err := conn.WriteTo(b[:n], v.(net.Addr))
return err
}
@ -622,3 +681,7 @@ func (c *tunTapConn) SetReadDeadline(t time.Time) error {
func (c *tunTapConn) SetWriteDeadline(t time.Time) error {
return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
}
func IsIPv6Multicast(addr net.HardwareAddr) bool {
return addr[0] == 0x33 && addr[1] == 0x33
}

9
tuntap_darwin.go
View File

@ -11,8 +11,8 @@ import (
"github.com/songgao/water"
)
func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
ip, ipNet, err := net.ParseCIDR(cfg.Addr)
func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
ip, _, err := net.ParseCIDR(cfg.Addr)
if err != nil {
return
}
@ -41,6 +41,11 @@ func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
return
}
itf, err = net.InterfaceByName(ifce.Name())
if err != nil {
return
}
conn = &tunTapConn{
ifce: ifce,
addr: &net.IPAddr{IP: ip},

7
tuntap_linux.go
View File

@ -10,7 +10,7 @@ import (
"github.com/songgao/water"
)
func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
ip, ipNet, err := net.ParseCIDR(cfg.Addr)
if err != nil {
return
@ -61,6 +61,11 @@ func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
return
}
itf, err = net.InterfaceByName(ifce.Name())
if err != nil {
return
}
conn = &tunTapConn{
ifce: ifce,
addr: &net.IPAddr{IP: ip},

9
tuntap_unix.go
View File

@ -12,8 +12,8 @@ import (
"github.com/songgao/water"
)
func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
ip, ipNet, err := net.ParseCIDR(cfg.Addr)
func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
ip, _, err := net.ParseCIDR(cfg.Addr)
if err != nil {
return
}
@ -42,6 +42,11 @@ func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
return
}
itf, err = net.InterfaceByName(ifce.Name())
if err != nil {
return
}
conn = &tunTapConn{
ifce: ifce,
addr: &net.IPAddr{IP: ip},

7
tuntap_windows.go
View File

@ -10,7 +10,7 @@ import (
"github.com/songgao/water"
)
func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
ip, ipNet, err := net.ParseCIDR(cfg.Addr)
if err != nil {
return
@ -42,6 +42,11 @@ func createTun(cfg TunConfig) (conn net.Conn, ipNet *net.IPNet, err error) {
return
}
itf, err = net.InterfaceByName(ifce.Name())
if err != nil {
return
}
conn = &tunTapConn{
ifce: ifce,
addr: &net.IPAddr{IP: ip},