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tun: darwin: fetch flags and mtu from if_msghdr directly

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Signed-off-by: ruokeqx <ruokeqx@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
ruokeqx 2025-01-02 20:28:33 +08:00 • committed by jmwample
parent 75d6c67a67
commit 8a2b2bf4f4
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1 changed files with 9 additions and 25 deletions
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34
tun/tun_darwin.go
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@ -6,14 +6,12 @@
package tun
import (
"errors"
"fmt"
"io"
"net"
"os"
"sync"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/unix"
@ -30,18 +28,6 @@ type NativeTun struct {
closeOnce sync.Once
}
func retryInterfaceByIndex(index int) (iface *net.Interface, err error) {
for i := 0; i < 20; i++ {
iface, err = net.InterfaceByIndex(index)
if err != nil && errors.Is(err, unix.ENOMEM) {
time.Sleep(time.Duration(i) * time.Second / 3)
continue
}
return iface, err
}
return nil, err
}
func (tun *NativeTun) routineRouteListener(tunIfindex int) {
var (
statusUp bool
@ -62,26 +48,22 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
return
}
if n < 14 {
if n < 28 {
continue
}
if data[3 /* type */] != unix.RTM_IFINFO {
if data[3 /* ifm_type */] != unix.RTM_IFINFO {
continue
}
ifindex := int(*(*uint16)(unsafe.Pointer(&data[12 /* ifindex */])))
ifindex := int(*(*uint16)(unsafe.Pointer(&data[12 /* ifm_index */])))
if ifindex != tunIfindex {
continue
}
iface, err := retryInterfaceByIndex(ifindex)
if err != nil {
tun.errors <- err
return
}
flags := int(*(*uint32)(unsafe.Pointer(&data[8 /* ifm_flags */])))
// Up / Down event
up := (iface.Flags & net.FlagUp) != 0
up := (flags & syscall.IFF_UP) != 0
if up != statusUp && up {
tun.events <- EventUp
}
@ -90,11 +72,13 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
}
statusUp = up
mtu := int(*(*uint32)(unsafe.Pointer(&data[24 /* ifm_data.ifi_mtu */])))
// MTU changes
if iface.MTU != statusMTU {
if mtu != statusMTU {
tun.events <- EventMTUUpdate
}
statusMTU = iface.MTU
statusMTU = mtu
}
}