2019-01-02 00:55:51 +00:00
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/* SPDX-License-Identifier: MIT
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2018-05-03 13:04:00 +00:00
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*
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2019-01-02 00:55:51 +00:00
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* Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
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2018-05-03 13:04:00 +00:00
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*/
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2018-05-23 00:10:54 +00:00
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package tun
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2017-06-04 19:48:15 +00:00
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2017-07-20 13:06:24 +00:00
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/* Implementation of the TUN device interface for linux
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*/
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2017-06-04 19:48:15 +00:00
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import (
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2018-05-05 00:48:21 +00:00
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"bytes"
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2017-06-04 19:48:15 +00:00
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"errors"
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2017-08-16 22:25:39 +00:00
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"fmt"
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2019-02-18 03:44:41 +00:00
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"golang.zx2c4.com/wireguard/rwcancel"
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2017-12-04 20:39:06 +00:00
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"golang.org/x/net/ipv6"
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2017-07-20 13:06:24 +00:00
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"golang.org/x/sys/unix"
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2017-08-04 14:15:53 +00:00
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"net"
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2017-06-04 19:48:15 +00:00
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"os"
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2018-04-18 14:39:14 +00:00
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"strconv"
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2018-05-21 01:31:44 +00:00
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"sync"
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2017-11-29 17:46:31 +00:00
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"time"
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2017-06-04 19:48:15 +00:00
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"unsafe"
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)
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2017-08-16 22:25:39 +00:00
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const (
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2018-02-13 15:43:07 +00:00
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cloneDevicePath = "/dev/net/tun"
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ifReqSize = unix.IFNAMSIZ + 64
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2017-08-16 22:25:39 +00:00
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)
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2017-06-04 19:48:15 +00:00
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2018-05-23 00:10:54 +00:00
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type nativeTun struct {
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2018-10-17 19:26:53 +00:00
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tunFile *os.File
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fd uintptr
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2018-05-21 01:31:44 +00:00
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fdCancel *rwcancel.RWCancel
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index int32 // if index
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name string // name of interface
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errors chan error // async error handling
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events chan TUNEvent // device related events
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nopi bool // the device was pased IFF_NO_PI
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netlinkSock int
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netlinkCancel *rwcancel.RWCancel
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hackListenerClosed sync.Mutex
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2018-05-14 01:43:56 +00:00
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statusListenersShutdown chan struct{}
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2017-08-16 22:25:39 +00:00
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) File() *os.File {
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2018-10-17 19:26:53 +00:00
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return tun.tunFile
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2017-11-14 17:26:28 +00:00
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) routineHackListener() {
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2018-05-21 01:31:44 +00:00
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defer tun.hackListenerClosed.Unlock()
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2017-11-29 20:12:09 +00:00
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/* This is needed for the detection to work across network namespaces
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2017-11-29 17:46:31 +00:00
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* If you are reading this and know a better method, please get in touch.
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*/
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2018-10-17 19:26:53 +00:00
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fd := int(tun.fd)
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2017-11-29 17:46:31 +00:00
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for {
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_, err := unix.Write(fd, nil)
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switch err {
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case unix.EINVAL:
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2018-02-11 17:55:30 +00:00
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tun.events <- TUNEventUp
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2017-11-29 17:46:31 +00:00
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case unix.EIO:
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2018-02-11 17:55:30 +00:00
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tun.events <- TUNEventDown
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2017-11-29 17:46:31 +00:00
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default:
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2018-05-14 00:14:33 +00:00
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return
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}
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select {
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2018-05-20 02:03:11 +00:00
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case <-time.After(time.Second):
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2018-05-14 01:43:56 +00:00
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case <-tun.statusListenersShutdown:
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2018-05-14 00:14:33 +00:00
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return
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2017-11-29 17:46:31 +00:00
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}
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}
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}
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2018-05-14 00:14:33 +00:00
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func createNetlinkSocket() (int, error) {
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2018-04-27 00:23:48 +00:00
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sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW, unix.NETLINK_ROUTE)
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2018-02-13 15:43:07 +00:00
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if err != nil {
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2018-05-14 00:14:33 +00:00
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return -1, err
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2017-08-16 22:25:39 +00:00
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}
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2018-04-27 00:23:48 +00:00
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saddr := &unix.SockaddrNetlink{
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Family: unix.AF_NETLINK,
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2018-05-14 00:14:33 +00:00
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Groups: uint32((1 << (unix.RTNLGRP_LINK - 1)) | (1 << (unix.RTNLGRP_IPV4_IFADDR - 1)) | (1 << (unix.RTNLGRP_IPV6_IFADDR - 1))),
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2018-04-27 00:23:48 +00:00
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}
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err = unix.Bind(sock, saddr)
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if err != nil {
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2018-05-14 00:14:33 +00:00
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return -1, err
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2018-04-27 00:23:48 +00:00
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}
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2018-05-14 00:14:33 +00:00
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return sock, nil
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}
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2018-04-27 00:23:48 +00:00
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) routineNetlinkListener() {
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2018-05-20 04:38:39 +00:00
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defer func() {
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unix.Close(tun.netlinkSock)
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2018-05-21 01:31:44 +00:00
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tun.hackListenerClosed.Lock()
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2018-05-20 04:38:39 +00:00
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close(tun.events)
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}()
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2018-05-14 12:08:03 +00:00
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2017-08-16 22:25:39 +00:00
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for msg := make([]byte, 1<<16); ; {
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2018-05-14 12:08:03 +00:00
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var err error
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var msgn int
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for {
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msgn, _, _, _, err = unix.Recvmsg(tun.netlinkSock, msg[:], nil, 0)
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2018-05-24 13:29:16 +00:00
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if err == nil || !rwcancel.RetryAfterError(err) {
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2018-05-14 12:08:03 +00:00
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break
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}
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if !tun.netlinkCancel.ReadyRead() {
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tun.errors <- fmt.Errorf("netlink socket closed: %s", err.Error())
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return
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}
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}
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2017-08-16 22:25:39 +00:00
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if err != nil {
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2018-05-14 00:14:33 +00:00
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tun.errors <- fmt.Errorf("failed to receive netlink message: %s", err.Error())
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2017-08-16 22:25:39 +00:00
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return
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}
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2018-05-14 01:43:56 +00:00
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select {
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case <-tun.statusListenersShutdown:
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return
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default:
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}
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2017-08-16 22:25:39 +00:00
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for remain := msg[:msgn]; len(remain) >= unix.SizeofNlMsghdr; {
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hdr := *(*unix.NlMsghdr)(unsafe.Pointer(&remain[0]))
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if int(hdr.Len) > len(remain) {
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break
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}
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switch hdr.Type {
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case unix.NLMSG_DONE:
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remain = []byte{}
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case unix.RTM_NEWLINK:
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info := *(*unix.IfInfomsg)(unsafe.Pointer(&remain[unix.SizeofNlMsghdr]))
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2017-08-22 12:57:32 +00:00
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remain = remain[hdr.Len:]
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2017-08-16 22:25:39 +00:00
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2017-08-17 10:58:18 +00:00
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if info.Index != tun.index {
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// not our interface
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continue
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}
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2017-08-16 22:25:39 +00:00
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if info.Flags&unix.IFF_RUNNING != 0 {
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2018-02-11 17:55:30 +00:00
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tun.events <- TUNEventUp
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2017-08-16 22:25:39 +00:00
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}
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if info.Flags&unix.IFF_RUNNING == 0 {
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2018-02-11 17:55:30 +00:00
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tun.events <- TUNEventDown
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2017-08-16 22:25:39 +00:00
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}
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2018-02-11 17:55:30 +00:00
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tun.events <- TUNEventMTUUpdate
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2017-08-16 22:25:39 +00:00
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default:
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remain = remain[hdr.Len:]
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}
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}
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}
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2017-06-04 19:48:15 +00:00
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) isUp() (bool, error) {
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2017-08-04 14:15:53 +00:00
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inter, err := net.InterfaceByName(tun.name)
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return inter.Flags&net.FlagUp != 0, err
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}
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2017-08-16 22:25:39 +00:00
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func getDummySock() (int, error) {
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return unix.Socket(
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unix.AF_INET,
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unix.SOCK_DGRAM,
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0,
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)
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}
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2017-08-17 10:58:18 +00:00
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func getIFIndex(name string) (int32, error) {
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2017-08-16 22:25:39 +00:00
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fd, err := getDummySock()
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if err != nil {
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return 0, err
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}
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defer unix.Close(fd)
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2018-02-13 15:43:07 +00:00
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var ifr [ifReqSize]byte
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2017-08-16 22:25:39 +00:00
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copy(ifr[:], name)
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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uintptr(fd),
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uintptr(unix.SIOCGIFINDEX),
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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return 0, errno
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}
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2018-05-23 00:10:54 +00:00
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return *(*int32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])), nil
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2017-08-16 22:25:39 +00:00
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) setMTU(n int) error {
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2017-07-15 14:27:59 +00:00
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// open datagram socket
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2017-07-20 13:06:24 +00:00
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fd, err := unix.Socket(
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unix.AF_INET,
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unix.SOCK_DGRAM,
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2017-07-15 14:27:59 +00:00
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0,
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)
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if err != nil {
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return err
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}
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2017-07-20 13:06:24 +00:00
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defer unix.Close(fd)
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2017-07-18 12:15:29 +00:00
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2017-07-15 14:27:59 +00:00
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// do ioctl call
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2018-02-13 15:43:07 +00:00
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var ifr [ifReqSize]byte
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2017-07-15 14:27:59 +00:00
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copy(ifr[:], tun.name)
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2018-05-23 00:10:54 +00:00
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*(*uint32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = uint32(n)
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2017-07-20 13:06:24 +00:00
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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2017-07-15 14:27:59 +00:00
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uintptr(fd),
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2017-07-20 13:06:24 +00:00
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uintptr(unix.SIOCSIFMTU),
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2017-07-15 14:27:59 +00:00
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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2018-05-21 15:27:18 +00:00
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return errors.New("failed to set MTU of TUN device")
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2017-07-15 14:27:59 +00:00
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}
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return nil
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) MTU() (int, error) {
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2017-07-11 20:48:58 +00:00
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// open datagram socket
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2017-07-20 13:06:24 +00:00
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fd, err := unix.Socket(
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unix.AF_INET,
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unix.SOCK_DGRAM,
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2017-07-11 20:48:58 +00:00
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0,
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)
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if err != nil {
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return 0, err
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}
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2017-07-20 13:06:24 +00:00
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defer unix.Close(fd)
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2017-07-18 12:15:29 +00:00
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2017-07-11 20:48:58 +00:00
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// do ioctl call
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2018-02-13 15:43:07 +00:00
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var ifr [ifReqSize]byte
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2017-07-11 20:48:58 +00:00
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copy(ifr[:], tun.name)
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2017-07-20 13:06:24 +00:00
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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2017-07-11 20:48:58 +00:00
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uintptr(fd),
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2017-07-20 13:06:24 +00:00
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uintptr(unix.SIOCGIFMTU),
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2017-07-11 20:48:58 +00:00
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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2018-05-21 15:27:18 +00:00
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return 0, errors.New("failed to get MTU of TUN device: " + strconv.FormatInt(int64(errno), 10))
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2017-07-11 20:48:58 +00:00
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}
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2018-05-23 00:10:54 +00:00
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return int(*(*int32)(unsafe.Pointer(&ifr[unix.IFNAMSIZ]))), nil
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2017-06-04 19:48:15 +00:00
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) Name() (string, error) {
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2018-04-18 14:39:14 +00:00
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var ifr [ifReqSize]byte
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_, _, errno := unix.Syscall(
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unix.SYS_IOCTL,
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2018-10-17 19:26:53 +00:00
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tun.fd,
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2018-04-18 14:39:14 +00:00
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uintptr(unix.TUNGETIFF),
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uintptr(unsafe.Pointer(&ifr[0])),
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)
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if errno != 0 {
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2018-05-21 15:27:18 +00:00
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return "", errors.New("failed to get name of TUN device: " + strconv.FormatInt(int64(errno), 10))
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2018-04-18 14:39:14 +00:00
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}
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2018-05-05 00:47:35 +00:00
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nullStr := ifr[:]
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i := bytes.IndexByte(nullStr, 0)
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if i != -1 {
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nullStr = nullStr[:i]
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}
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tun.name = string(nullStr)
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2018-04-18 14:39:14 +00:00
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return tun.name, nil
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}
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2018-05-23 00:10:54 +00:00
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func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
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2017-12-04 20:39:06 +00:00
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2018-02-28 11:40:56 +00:00
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if tun.nopi {
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buff = buff[offset:]
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} else {
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// reserve space for header
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2017-12-04 20:39:06 +00:00
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2018-02-28 11:40:56 +00:00
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buff = buff[offset-4:]
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2017-12-04 20:39:06 +00:00
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2018-02-28 11:40:56 +00:00
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// add packet information header
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2017-12-04 20:39:06 +00:00
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2018-02-28 11:40:56 +00:00
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buff[0] = 0x00
|
|
|
|
buff[1] = 0x00
|
2017-12-04 20:39:06 +00:00
|
|
|
|
2018-04-20 03:30:22 +00:00
|
|
|
if buff[4]>>4 == ipv6.Version {
|
2018-02-28 11:40:56 +00:00
|
|
|
buff[2] = 0x86
|
|
|
|
buff[3] = 0xdd
|
|
|
|
} else {
|
|
|
|
buff[2] = 0x08
|
|
|
|
buff[3] = 0x00
|
|
|
|
}
|
2017-12-04 20:39:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// write
|
|
|
|
|
2018-10-17 19:26:53 +00:00
|
|
|
return tun.tunFile.Write(buff)
|
2017-06-04 19:48:15 +00:00
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
|
2017-08-16 22:25:39 +00:00
|
|
|
select {
|
|
|
|
case err := <-tun.errors:
|
|
|
|
return 0, err
|
|
|
|
default:
|
2018-02-28 11:40:56 +00:00
|
|
|
if tun.nopi {
|
2018-10-17 19:26:53 +00:00
|
|
|
return tun.tunFile.Read(buff[offset:])
|
2018-02-28 11:40:56 +00:00
|
|
|
} else {
|
|
|
|
buff := buff[offset-4:]
|
2018-10-17 19:26:53 +00:00
|
|
|
n, err := tun.tunFile.Read(buff[:])
|
2018-02-28 11:40:56 +00:00
|
|
|
if n < 4 {
|
|
|
|
return 0, err
|
|
|
|
}
|
|
|
|
return n - 4, err
|
2017-12-04 20:39:06 +00:00
|
|
|
}
|
2017-08-16 22:25:39 +00:00
|
|
|
}
|
2017-06-04 19:48:15 +00:00
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
|
2018-04-19 05:46:27 +00:00
|
|
|
for {
|
|
|
|
n, err := tun.doRead(buff, offset)
|
2018-05-24 13:29:16 +00:00
|
|
|
if err == nil || !rwcancel.RetryAfterError(err) {
|
2018-04-19 05:46:27 +00:00
|
|
|
return n, err
|
|
|
|
}
|
2018-05-14 12:08:03 +00:00
|
|
|
if !tun.fdCancel.ReadyRead() {
|
2018-05-13 22:28:30 +00:00
|
|
|
return 0, errors.New("tun device closed")
|
2018-04-19 05:46:27 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func (tun *nativeTun) Events() chan TUNEvent {
|
2017-08-07 13:25:04 +00:00
|
|
|
return tun.events
|
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func (tun *nativeTun) Close() error {
|
2018-05-14 12:08:03 +00:00
|
|
|
var err1 error
|
2018-05-21 12:16:46 +00:00
|
|
|
if tun.statusListenersShutdown != nil {
|
|
|
|
close(tun.statusListenersShutdown)
|
|
|
|
if tun.netlinkCancel != nil {
|
|
|
|
err1 = tun.netlinkCancel.Cancel()
|
|
|
|
}
|
|
|
|
} else if tun.events != nil {
|
|
|
|
close(tun.events)
|
2018-05-14 12:08:03 +00:00
|
|
|
}
|
2018-10-17 19:26:53 +00:00
|
|
|
err2 := tun.tunFile.Close()
|
2018-05-14 12:08:03 +00:00
|
|
|
err3 := tun.fdCancel.Cancel()
|
2018-05-14 00:14:33 +00:00
|
|
|
|
|
|
|
if err1 != nil {
|
|
|
|
return err1
|
|
|
|
}
|
2018-05-14 01:43:56 +00:00
|
|
|
if err2 != nil {
|
|
|
|
return err2
|
|
|
|
}
|
|
|
|
return err3
|
2017-08-07 13:25:04 +00:00
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func CreateTUN(name string, mtu int) (TUNDevice, error) {
|
2018-05-05 01:36:09 +00:00
|
|
|
nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0)
|
2018-04-19 05:46:27 +00:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
fd := os.NewFile(uintptr(nfd), cloneDevicePath)
|
2017-06-04 19:48:15 +00:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2017-07-15 14:27:59 +00:00
|
|
|
// create new device
|
2017-07-11 20:48:58 +00:00
|
|
|
|
2018-02-13 15:43:07 +00:00
|
|
|
var ifr [ifReqSize]byte
|
|
|
|
var flags uint16 = unix.IFF_TUN // | unix.IFF_NO_PI (disabled for TUN status hack)
|
2017-06-04 19:48:15 +00:00
|
|
|
nameBytes := []byte(name)
|
2017-07-20 13:06:24 +00:00
|
|
|
if len(nameBytes) >= unix.IFNAMSIZ {
|
2018-05-14 00:14:33 +00:00
|
|
|
return nil, errors.New("interface name too long")
|
2017-06-04 19:48:15 +00:00
|
|
|
}
|
|
|
|
copy(ifr[:], nameBytes)
|
2018-05-23 00:10:54 +00:00
|
|
|
*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = flags
|
2017-06-04 19:48:15 +00:00
|
|
|
|
2017-07-20 13:06:24 +00:00
|
|
|
_, _, errno := unix.Syscall(
|
|
|
|
unix.SYS_IOCTL,
|
2018-04-18 14:39:14 +00:00
|
|
|
fd.Fd(),
|
2017-07-20 13:06:24 +00:00
|
|
|
uintptr(unix.TUNSETIFF),
|
2017-07-11 20:48:58 +00:00
|
|
|
uintptr(unsafe.Pointer(&ifr[0])),
|
|
|
|
)
|
2017-06-04 19:48:15 +00:00
|
|
|
if errno != 0 {
|
2017-08-16 22:25:39 +00:00
|
|
|
return nil, errno
|
2017-06-04 19:48:15 +00:00
|
|
|
}
|
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
return CreateTUNFromFile(fd, mtu)
|
2018-05-05 01:36:09 +00:00
|
|
|
}
|
2017-07-11 20:48:58 +00:00
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
|
|
|
|
tun := &nativeTun{
|
2018-10-17 19:26:53 +00:00
|
|
|
tunFile: file,
|
|
|
|
fd: file.Fd(),
|
2018-05-14 01:43:56 +00:00
|
|
|
events: make(chan TUNEvent, 5),
|
|
|
|
errors: make(chan error, 5),
|
2018-05-14 02:19:25 +00:00
|
|
|
statusListenersShutdown: make(chan struct{}),
|
2018-10-17 19:26:53 +00:00
|
|
|
nopi: false,
|
2017-07-15 14:27:59 +00:00
|
|
|
}
|
2018-05-05 01:36:09 +00:00
|
|
|
var err error
|
|
|
|
|
2018-10-17 19:26:53 +00:00
|
|
|
tun.fdCancel, err = rwcancel.NewRWCancel(int(tun.fd))
|
2018-05-05 01:36:09 +00:00
|
|
|
if err != nil {
|
2018-10-17 19:26:53 +00:00
|
|
|
tun.tunFile.Close()
|
2018-05-05 01:36:09 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-14 10:27:29 +00:00
|
|
|
_, err = tun.Name()
|
2018-05-05 01:36:09 +00:00
|
|
|
if err != nil {
|
2018-10-17 19:26:53 +00:00
|
|
|
tun.tunFile.Close()
|
2018-05-05 01:36:09 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
2017-07-15 14:27:59 +00:00
|
|
|
|
2017-08-17 10:58:18 +00:00
|
|
|
// start event listener
|
2017-08-16 22:25:39 +00:00
|
|
|
|
2018-05-14 10:27:29 +00:00
|
|
|
tun.index, err = getIFIndex(tun.name)
|
2017-08-16 22:25:39 +00:00
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-14 10:27:29 +00:00
|
|
|
tun.netlinkSock, err = createNetlinkSocket()
|
2018-05-14 00:14:33 +00:00
|
|
|
if err != nil {
|
2018-10-17 19:26:53 +00:00
|
|
|
tun.tunFile.Close()
|
2018-05-14 12:08:03 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
tun.netlinkCancel, err = rwcancel.NewRWCancel(tun.netlinkSock)
|
|
|
|
if err != nil {
|
2018-10-17 19:26:53 +00:00
|
|
|
tun.tunFile.Close()
|
2018-05-14 00:14:33 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-21 01:31:44 +00:00
|
|
|
tun.hackListenerClosed.Lock()
|
2018-05-23 00:10:54 +00:00
|
|
|
go tun.routineNetlinkListener()
|
|
|
|
go tun.routineHackListener() // cross namespace
|
2018-05-14 10:27:29 +00:00
|
|
|
|
2018-05-23 00:10:54 +00:00
|
|
|
err = tun.setMTU(mtu)
|
2018-05-14 00:14:33 +00:00
|
|
|
if err != nil {
|
2018-05-14 10:27:29 +00:00
|
|
|
tun.Close()
|
2018-05-14 00:14:33 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
2018-05-14 10:27:29 +00:00
|
|
|
return tun, nil
|
2017-06-04 19:48:15 +00:00
|
|
|
}
|