github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/tcpip/link/ethernet/ethernet_test.go (about)

     1  // Copyright 2021 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ethernet_test
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/SagerNet/gvisor/pkg/tcpip"
    21  	"github.com/SagerNet/gvisor/pkg/tcpip/buffer"
    22  	"github.com/SagerNet/gvisor/pkg/tcpip/header"
    23  	"github.com/SagerNet/gvisor/pkg/tcpip/link/channel"
    24  	"github.com/SagerNet/gvisor/pkg/tcpip/link/ethernet"
    25  	"github.com/SagerNet/gvisor/pkg/tcpip/stack"
    26  )
    27  
    28  var _ stack.NetworkDispatcher = (*testNetworkDispatcher)(nil)
    29  
    30  type testNetworkDispatcher struct {
    31  	networkPackets int
    32  }
    33  
    34  func (t *testNetworkDispatcher) DeliverNetworkPacket(_, _ tcpip.LinkAddress, _ tcpip.NetworkProtocolNumber, _ *stack.PacketBuffer) {
    35  	t.networkPackets++
    36  }
    37  
    38  func (*testNetworkDispatcher) DeliverOutboundPacket(_, _ tcpip.LinkAddress, _ tcpip.NetworkProtocolNumber, _ *stack.PacketBuffer) {
    39  }
    40  
    41  func TestDeliverNetworkPacket(t *testing.T) {
    42  	const (
    43  		linkAddr       = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06")
    44  		otherLinkAddr1 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x07")
    45  		otherLinkAddr2 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x08")
    46  	)
    47  
    48  	e := ethernet.New(channel.New(0, 0, linkAddr))
    49  	var networkDispatcher testNetworkDispatcher
    50  	e.Attach(&networkDispatcher)
    51  
    52  	if networkDispatcher.networkPackets != 0 {
    53  		t.Fatalf("got networkDispatcher.networkPackets = %d, want = 0", networkDispatcher.networkPackets)
    54  	}
    55  
    56  	// An ethernet frame with a destination link address that is not assigned to
    57  	// our ethernet link endpoint should still be delivered to the network
    58  	// dispatcher since the ethernet endpoint is not expected to filter frames.
    59  	eth := buffer.NewView(header.EthernetMinimumSize)
    60  	header.Ethernet(eth).Encode(&header.EthernetFields{
    61  		SrcAddr: otherLinkAddr1,
    62  		DstAddr: otherLinkAddr2,
    63  		Type:    header.IPv4ProtocolNumber,
    64  	})
    65  	e.DeliverNetworkPacket("", "", 0, stack.NewPacketBuffer(stack.PacketBufferOptions{
    66  		Data: eth.ToVectorisedView(),
    67  	}))
    68  	if networkDispatcher.networkPackets != 1 {
    69  		t.Fatalf("got networkDispatcher.networkPackets = %d, want = 1", networkDispatcher.networkPackets)
    70  	}
    71  }