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27 Commits

Author SHA1 Message Date
Jason A. Donenfeld
3625f8d284 tun: freebsd: avoid OOB writes 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-04-19 15:10:23 -06:00
Jason A. Donenfeld
0687dc06c8 tun: freebsd: become controlling process when reopening tun FD 
When we pass the TUN FD to the child, we have to call TUNSIFPID;
otherwise when we close the device, we get a splat in dmesg.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-04-19 15:02:44 -06:00
Jason A. Donenfeld
71aefa374d tun: freebsd: restructure and cleanup 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-04-19 14:54:59 -06:00
Jason A. Donenfeld
3d3e30beb8 tun: freebsd: remove horrific hack for getting tunnel name 
As of FreeBSD 12.1, there's TUNGIFNAME.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-04-19 12:03:16 -06:00
Jason A. Donenfeld
b0e5b19969 tun: freebsd: set IFF_MULTICAST for routing daemons 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-04-18 20:09:04 -06:00
Jason A. Donenfeld
12ce53271b tun: freebsd: use broadcast mode instead of PPP mode 
It makes the routing configuration simpler.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-03-23 12:41:34 -06:00
Kay Diam
6005c573e2 tun: freebsd: allow empty names 
This change allows omitting the tun interface name setting. When the
name is not set, the kernel automatically picks up the tun name and
index.

Signed-off-by: Kay Diam <kay.diam@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-03-08 21:32:27 -07:00
Brad Fitzpatrick
0f4809f366 tun: make NativeTun.Close well behaved, not crash on double close 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2021-02-22 15:26:29 +01:00
Jason A. Donenfeld
d4112d9096 global: bump copyright 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2021-01-28 17:52:15 +01:00
Jason A. Donenfeld
82128c47d9 global: switch to using %w instead of %v for Errorf 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2020-11-07 21:56:32 +01:00
Jason A. Donenfeld
db0aa39b76 global: update header comments and modules 
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
 2020-05-02 02:08:26 -06:00
Matt Layher
1f48971a80 tun: remove TUN prefix from types to reduce stutter elsewhere 
Signed-off-by: Matt Layher <mdlayher@gmail.com>
 2019-06-14 18:35:57 +02:00
Jason A. Donenfeld
eaf17becfa global: fixup TODO comment spacing 2019-06-06 23:00:15 +02:00
Jason A. Donenfeld
3bf41b06ae global: regroup all imports 2019-05-14 09:09:52 +02:00
Jason A. Donenfeld
bb42ec7d18 tun: freebsd: work around numerous kernel panics on shutdown 
There are numerous race conditions. But even this will crash it:

while true; do ifconfig tun0 create; ifconfig tun0 destroy; done

It seems like LLv6 is related, which we're not using anyway, so
explicitly disable it on the interface.
 2019-04-23 18:00:23 +09:00
Jason A. Donenfeld
6440f010ee receive: implement flush semantics 2019-03-21 14:45:41 -06:00
Jason A. Donenfeld
967d1a0f3d tun: allow special methods in NativeTun 2019-03-01 00:05:57 +01:00
Jason A. Donenfeld
366cbd11a4 tun: use netpoll instead of rwcancel 
The new sysconn function of Go 1.12 makes this possible:

package main

import "log"
import "os"
import "unsafe"
import "time"
import "syscall"
import "sync"
import "golang.org/x/sys/unix"

func main() {
	fd, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
	if err != nil {
		log.Fatal(err)
	}

	var ifr [unix.IFNAMSIZ + 64]byte
	copy(ifr[:], []byte("cheese"))
	*(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = unix.IFF_TUN

	var errno syscall.Errno
	s, _ := fd.SyscallConn()
	s.Control(func(fd uintptr) {
		_, _, errno = unix.Syscall(
			unix.SYS_IOCTL,
			fd,
			uintptr(unix.TUNSETIFF),
			uintptr(unsafe.Pointer(&ifr[0])),
		)
	})
	if errno != 0 {
		log.Fatal(errno)
	}

	b := [4]byte{}
	wait := sync.WaitGroup{}
	wait.Add(1)
	go func() {
		_, err := fd.Read(b[:])
		log.Print("Read errored: ", err)
		wait.Done()
	}()
	time.Sleep(time.Second)
	log.Print("Closing")
	err = fd.Close()
	if err != nil {
		log.Print("Close errored: " , err)
	}
	wait.Wait()
	log.Print("Exiting")
}
 2019-02-27 01:52:55 +01:00
Jason A. Donenfeld
ab0f442daf tun: use sysconn instead of .Fd with Go 1.12 2019-02-27 01:34:11 +01:00
Jason A. Donenfeld
42c6d0e261 Change package path 2019-02-18 05:11:39 +01:00
Jason A. Donenfeld
dff424baf8 Update copyright 2019-02-05 12:59:42 +01:00
Jason A. Donenfeld
2e772194cf tun: only call .Fd() once 
Doing so tends to make the tunnel blocking, so we only retrieve it once
before we call SetNonblock, and then cache the result.
 2018-10-17 21:31:42 +02:00
Jason A. Donenfeld
5be541d147 global: fix up copyright headers 2018-09-16 18:49:19 +02:00
Jason A. Donenfeld
5079298ce2 Disable broadcast mode on *BSD 
Keeping it on makes IPv6 problematic and confuses routing daemons.
 2018-05-27 22:55:15 +02:00
Jason A. Donenfeld
2f2eca8947 Catch EINTR 2018-05-24 15:36:29 +02:00
Jason A. Donenfeld
588b9f01ae Adopt GOPATH 
GOPATH is annoying, but the Go community pushing me to adopt it is even
more annoying.
 2018-05-23 05:18:13 +02:00
Jason A. Donenfeld
0a63188afa Move tun to subpackage 2018-05-23 03:58:27 +02:00