diff options
| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2021-04-19 15:01:36 -0600 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2021-04-19 15:02:44 -0600 |
| commit | 0687dc06c873d4dac0b604d642d724c2f5abb6b6 (patch) | |
| tree | f4c146645ae88c5b9d0f1405f39ed5f76d8482d1 | |
| parent | 71aefa374d141776abfb8dede5c3af3fe796842e (diff) | |
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>
| -rw-r--r-- | tun/tun_freebsd.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tun/tun_freebsd.go b/tun/tun_freebsd.go index 53d4f41..37f1a0c 100644 --- a/tun/tun_freebsd.go +++ b/tun/tun_freebsd.go @@ -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() |