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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>
This commit is contained in:
Jason A. Donenfeld 2021-04-19 15:01:36 -06:00
parent 71aefa374d
commit 0687dc06c8
1 changed files with 10 additions and 0 deletions
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10
tun/tun_freebsd.go
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@ -21,6 +21,7 @@ const (
_TUNSIFHEAD = 0x80047460
_TUNSIFMODE = 0x8004745e
_TUNGIFNAME = 0x4020745d
_TUNSIFPID = 0x2000745f
_SIOCGIFINFO_IN6 = 0xc048696c
_SIOCSIFINFO_IN6 = 0xc048696d
@ -266,6 +267,15 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) {
errors: make(chan error, 1),
}
var errno syscall.Errno
tun.operateOnFd(func(fd uintptr) {
_, _, errno = unix.Syscall(unix.SYS_IOCTL, fd, _TUNSIFPID, uintptr(0))
})
if errno != 0 {
tun.tunFile.Close()
return nil, fmt.Errorf("unable to become controlling TUN process: %w", errno)
}
name, err := tun.Name()
if err != nil {
tun.tunFile.Close()