Minor fixes

Author: nekohasekai

stack_mixed.go

@@ -77,7 +77,7 @@ func (m *Mixed) tunLoop() {
 			return
 		}
 	}
-	if darwinTUN, isDarwinTUN := m.tun.(DarwinTUN); isDarwinTUN {
+	if darwinTUN, isDarwinTUN := m.tun.(DarwinTUN); isDarwinTUN && m.mtu < 49152 {
 		m.batchLoopDarwin(darwinTUN)
 		return
 	}

stack_system.go

@@ -174,7 +174,7 @@ func (s *System) tunLoop() {
 			return
 		}
 	}
-	if darwinTUN, isDarwinTUN := s.tun.(DarwinTUN); isDarwinTUN {
+	if darwinTUN, isDarwinTUN := s.tun.(DarwinTUN); isDarwinTUN && s.mtu < 49152 {
 		s.batchLoopDarwin(darwinTUN)
 		return
 	}

tun_darwin.go

@@ -386,6 +386,7 @@ func (t *NativeTun) BatchRead() ([]*buf.Buffer, error) {
 func (t *NativeTun) BatchWrite(buffers []*buf.Buffer) error {
 	for i, buffer := range buffers {
 		iovecs := t.iovecsOutput[i].nextIovecsOutput(buffer)
+		t.msgHdrsOutput[i] = rawfile.MsgHdrX{}
 		t.msgHdrsOutput[i].Msg.Iov = &iovecs[0]
 		t.msgHdrsOutput[i].Msg.Iovlen = 2
 	}

tun_darwin_gvisor.go

@@ -20,9 +20,7 @@ func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, stack.NICOptions, error)
 	if err != nil {
 		return nil, stack.NICOptions{}, err
 	}
-	var nicOptions stack.NICOptions
-	if t.options.MTU < 49152 {
-		nicOptions.QDisc = fifo.New(ep, 1, 1000)
-	}
-	return ep, nicOptions, nil
+	return ep, stack.NICOptions{
+		QDisc: fifo.New(ep, 1, 1000),
+	}, nil
 }

tun_linux_gvisor.go

@@ -7,6 +7,10 @@ import (
 	"github.com/sagernet/gvisor/pkg/tcpip/stack"
 )
 
+func init() {
+	fdbased.BufConfig = []int{65535}
+}
+
 var _ GVisorTun = (*NativeTun)(nil)
 
 func (t *NativeTun) NewEndpoint() (stack.LinkEndpoint, stack.NICOptions, error) {