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tun: bsd: remove redundant ioctl to set MTU (#1172)

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wireguard's CreateTUN() sets the MTU using the same ioctl(2), on both
FreeBSD and OpenBSD.

Tested on OpenBSD (outputwith this patch):

```
# ktrace ./yggdrasil -autoconf | grep Interface
2024/09/24 17:26:29 Interface name: tun0
2024/09/24 17:26:29 Interface IPv6: 201:26e:68f0:502e:f445:13eb:2fe1:f7cd/7
2024/09/24 17:26:29 Interface MTU: 16384
```

```
$ ifconfig tun0 | head -n1
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 16384
```

```
# kdump | grep ioctl
 53097 yggdrasil CALL  ioctl(10,SIOCGIFMTU,0xc0000376b8)
 53097 yggdrasil RET   ioctl 0
 53097 yggdrasil CALL  ioctl(10,SIOCSIFMTU,0xc0000376c0)
 53097 yggdrasil RET   ioctl 0
 53097 yggdrasil CALL  ioctl(10,SIOCGIFMTU,0xc0000377f8)
 53097 yggdrasil RET   ioctl 0
 53097 yggdrasil CALL  ioctl(10,_IOW('i',12,0x20),0xc00003777c)
 53097 yggdrasil RET   ioctl -1 errno 25 Inappropriate ioctl for device
       "2024/09/24 17:26:29 Error in SIOCSIFADDR_IN6: inappropriate ioctl for device
```

(The completely broken address ioctl is another story...)
This commit is contained in:
Klemens Nanni 2024-09-29 23:05:38 +03:00 committed by GitHub
parent c00779c7d3
commit 98a6fdb4f2
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1 changed files with 0 additions and 25 deletions
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25
src/tun/tun_bsd.go
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@ -54,11 +54,6 @@ struct in6_ifreq {
290 }; 290 };
*/ */
type in6_ifreq_mtu struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_mtu int
}
type in6_ifreq_addr struct { type in6_ifreq_addr struct {
ifr_name [syscall.IFNAMSIZ]byte ifr_name [syscall.IFNAMSIZ]byte
ifru_addr sockaddr_in6 ifru_addr sockaddr_in6
@ -112,26 +107,6 @@ func (tun *TunAdapter) setupAddress(addr string) error {
tun.log.Infof("Interface IPv6: %s", addr) tun.log.Infof("Interface IPv6: %s", addr)
tun.log.Infof("Interface MTU: %d", tun.mtu) tun.log.Infof("Interface MTU: %d", tun.mtu)
// Create the MTU request
var ir in6_ifreq_mtu
copy(ir.ifr_name[:], tun.Name())
ir.ifru_mtu = int(tun.mtu)
// Set the MTU
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
err = errno
tun.log.Errorf("Error in SIOCSIFMTU: %v", errno)
// Fall back to ifconfig to set the MTU
cmd := exec.Command("ifconfig", tun.Name(), "mtu", string(tun.mtu))
tun.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.log.Errorf("SIOCSIFMTU fallback failed: %v.", err)
tun.log.Traceln(string(output))
}
}
// Create the address request // Create the address request
// FIXME: I don't work! // FIXME: I don't work!
var ar in6_ifreq_addr var ar in6_ifreq_addr