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Support IPv6-less kernels

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This commit is contained in:
Jason A. Donenfeld 2018-06-11 19:04:38 +02:00
parent 0ba551807f
commit 6a5d0e2bcd
2 changed files with 105 additions and 51 deletions
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87
conn_default.go
View file

@ -11,7 +11,9 @@ package main
import (
"golang.org/x/sys/unix"
"net"
"os"
"runtime"
"syscall"
)
/* This code is meant to be a temporary solution
@ -87,6 +89,18 @@ func listenNet(network string, port int) (*net.UDPConn, int, error) {
return conn, uaddr.Port, nil
}
func extractErrno(err error) error {
opErr, ok := err.(*net.OpError)
if !ok {
return nil
}
syscallErr, ok := opErr.Err.(*os.SyscallError)
if !ok {
return nil
}
return syscallErr.Err
}
func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
var err error
var bind NativeBind
@ -94,13 +108,15 @@ func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
port := int(uport)
bind.ipv4, port, err = listenNet("udp4", port)
if err != nil {
if err != nil && extractErrno(err) != syscall.EAFNOSUPPORT {
return nil, 0, err
}
bind.ipv6, port, err = listenNet("udp6", port)
if err != nil {
if err != nil && extractErrno(err) != syscall.EAFNOSUPPORT {
return nil, 0, err
bind.ipv4.Close()
bind.ipv4 = nil
return nil, 0, err
}
@ -108,8 +124,13 @@ func CreateBind(uport uint16, device *Device) (Bind, uint16, error) {
}
func (bind *NativeBind) Close() error {
err1 := bind.ipv4.Close()
err2 := bind.ipv6.Close()
var err1, err2 error
if bind.ipv4 != nil {
err1 = bind.ipv4.Close()
}
if bind.ipv6 != nil {
err2 = bind.ipv6.Close()
}
if err1 != nil {
return err1
}
@ -117,6 +138,9 @@ func (bind *NativeBind) Close() error {
}
func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
if bind.ipv4 == nil {
return 0, nil, syscall.EAFNOSUPPORT
}
n, endpoint, err := bind.ipv4.ReadFromUDP(buff)
if endpoint != nil {
endpoint.IP = endpoint.IP.To4()
@ -125,6 +149,9 @@ func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
}
func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
if bind.ipv6 == nil {
return 0, nil, syscall.EAFNOSUPPORT
}
n, endpoint, err := bind.ipv6.ReadFromUDP(buff)
return n, (*NativeEndpoint)(endpoint), err
}
@ -133,8 +160,14 @@ func (bind *NativeBind) Send(buff []byte, endpoint Endpoint) error {
var err error
nend := endpoint.(*NativeEndpoint)
if nend.IP.To4() != nil {
if bind.ipv4 == nil {
return syscall.EAFNOSUPPORT
}
_, err = bind.ipv4.WriteToUDP(buff, (*net.UDPAddr)(nend))
} else {
if bind.ipv6 == nil {
return syscall.EAFNOSUPPORT
}
_, err = bind.ipv6.WriteToUDP(buff, (*net.UDPAddr)(nend))
}
return err
@ -157,31 +190,29 @@ func (bind *NativeBind) SetMark(mark uint32) error {
if fwmarkIoctl == 0 {
return nil
}
fd4, err1 := bind.ipv4.SyscallConn()
fd6, err2 := bind.ipv6.SyscallConn()
if err1 != nil {
return err1
if bind.ipv4 != nil {
fd, err := bind.ipv4.SyscallConn()
if err != nil {
return err
}
err = fd.Control(func(fd uintptr) {
err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
})
if err != nil {
return err
}
}
if err2 != nil {
return err2
}
err3 := fd4.Control(func(fd uintptr) {
err1 = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
})
err4 := fd6.Control(func(fd uintptr) {
err2 = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
})
if err1 != nil {
return err1
}
if err2 != nil {
return err2
}
if err3 != nil {
return err3
}
if err4 != nil {
return err4
if bind.ipv6 != nil {
fd, err := bind.ipv6.SyscallConn()
if err != nil {
return err
}
err = fd.Control(func(fd uintptr) {
err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
})
if err != nil {
return err
}
}
return nil
}

69
conn_linux.go
View file

@ -24,6 +24,7 @@ import (
"net"
"strconv"
"sync"
"syscall"
"unsafe"
)
@ -140,40 +141,45 @@ func CreateBind(port uint16, device *Device) (*NativeBind, uint16, error) {
go bind.routineRouteListener(device)
bind.sock6, port, err = create6(port)
if err != nil {
if err != nil && err != syscall.EAFNOSUPPORT {
bind.netlinkCancel.Cancel()
return nil, port, err
return nil, 0, err
}
bind.sock4, port, err = create4(port)
if err != nil {
if err != nil && err != syscall.EAFNOSUPPORT {
bind.netlinkCancel.Cancel()
unix.Close(bind.sock6)
return nil, 0, err
}
return &bind, port, err
return &bind, port, nil
}
func (bind *NativeBind) SetMark(value uint32) error {
err := unix.SetsockoptInt(
bind.sock6,
unix.SOL_SOCKET,
unix.SO_MARK,
int(value),
)
if bind.sock6 != -1 {
err := unix.SetsockoptInt(
bind.sock6,
unix.SOL_SOCKET,
unix.SO_MARK,
int(value),
)
if err != nil {
return err
if err != nil {
return err
}
}
err = unix.SetsockoptInt(
bind.sock4,
unix.SOL_SOCKET,
unix.SO_MARK,
int(value),
)
if bind.sock4 != -1 {
err := unix.SetsockoptInt(
bind.sock4,
unix.SOL_SOCKET,
unix.SO_MARK,
int(value),
)
if err != nil {
return err
if err != nil {
return err
}
}
bind.lastMark = value
@ -187,9 +193,14 @@ func closeUnblock(fd int) error {
}
func (bind *NativeBind) Close() error {
err1 := closeUnblock(bind.sock6)
err2 := closeUnblock(bind.sock4)
err3 := bind.netlinkCancel.Cancel()
var err1, err2, err3 error
if bind.sock6 != -1 {
err1 = closeUnblock(bind.sock6)
}
if bind.sock4 != -1 {
err2 = closeUnblock(bind.sock4)
}
err3 = bind.netlinkCancel.Cancel()
if err1 != nil {
return err1
@ -202,6 +213,9 @@ func (bind *NativeBind) Close() error {
func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
var end NativeEndpoint
if bind.sock6 == -1 {
return 0, nil, syscall.EAFNOSUPPORT
}
n, err := receive6(
bind.sock6,
buff,
@ -212,6 +226,9 @@ func (bind *NativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
var end NativeEndpoint
if bind.sock4 == -1 {
return 0, nil, syscall.EAFNOSUPPORT
}
n, err := receive4(
bind.sock4,
buff,
@ -223,8 +240,14 @@ func (bind *NativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
func (bind *NativeBind) Send(buff []byte, end Endpoint) error {
nend := end.(*NativeEndpoint)
if !nend.isV6 {
if bind.sock4 == -1 {
return syscall.EAFNOSUPPORT
}
return send4(bind.sock4, nend, buff)
} else {
if bind.sock6 == -1 {
return syscall.EAFNOSUPPORT
}
return send6(bind.sock6, nend, buff)
}
}