gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/tcpip/header/eth_test.go (about)

     1  // Copyright 2018 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 header
    16  
    17  import (
    18  	"testing"
    19  
    20  	"gvisor.dev/gvisor/pkg/tcpip"
    21  	"gvisor.dev/gvisor/pkg/tcpip/testutil"
    22  )
    23  
    24  func TestIsValidUnicastEthernetAddress(t *testing.T) {
    25  	tests := []struct {
    26  		name     string
    27  		addr     tcpip.LinkAddress
    28  		expected bool
    29  	}{
    30  		{
    31  			"Nil",
    32  			tcpip.LinkAddress([]byte(nil)),
    33  			false,
    34  		},
    35  		{
    36  			"Empty",
    37  			tcpip.LinkAddress(""),
    38  			false,
    39  		},
    40  		{
    41  			"InvalidLength",
    42  			tcpip.LinkAddress("\x01\x02\x03"),
    43  			false,
    44  		},
    45  		{
    46  			"Unspecified",
    47  			UnspecifiedEthernetAddress,
    48  			false,
    49  		},
    50  		{
    51  			"Multicast",
    52  			tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06"),
    53  			false,
    54  		},
    55  		{
    56  			"Valid",
    57  			tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06"),
    58  			true,
    59  		},
    60  	}
    61  
    62  	for _, test := range tests {
    63  		t.Run(test.name, func(t *testing.T) {
    64  			if got := IsValidUnicastEthernetAddress(test.addr); got != test.expected {
    65  				t.Fatalf("got IsValidUnicastEthernetAddress = %t, want = %t", got, test.expected)
    66  			}
    67  		})
    68  	}
    69  }
    70  
    71  func TestIsMulticastEthernetAddress(t *testing.T) {
    72  	tests := []struct {
    73  		name     string
    74  		addr     tcpip.LinkAddress
    75  		expected bool
    76  	}{
    77  		{
    78  			"Nil",
    79  			tcpip.LinkAddress([]byte(nil)),
    80  			false,
    81  		},
    82  		{
    83  			"Empty",
    84  			tcpip.LinkAddress(""),
    85  			false,
    86  		},
    87  		{
    88  			"InvalidLength",
    89  			tcpip.LinkAddress("\x01\x02\x03"),
    90  			false,
    91  		},
    92  		{
    93  			"Unspecified",
    94  			UnspecifiedEthernetAddress,
    95  			false,
    96  		},
    97  		{
    98  			"Multicast",
    99  			tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06"),
   100  			true,
   101  		},
   102  		{
   103  			"Unicast",
   104  			tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06"),
   105  			false,
   106  		},
   107  	}
   108  
   109  	for _, test := range tests {
   110  		t.Run(test.name, func(t *testing.T) {
   111  			if got := IsMulticastEthernetAddress(test.addr); got != test.expected {
   112  				t.Fatalf("got IsMulticastEthernetAddress = %t, want = %t", got, test.expected)
   113  			}
   114  		})
   115  	}
   116  }
   117  
   118  func TestEthernetAddressFromMulticastIPv4Address(t *testing.T) {
   119  	tests := []struct {
   120  		name             string
   121  		addr             string
   122  		expectedLinkAddr tcpip.LinkAddress
   123  	}{
   124  		{
   125  			name:             "IPv4 Multicast without 24th bit set",
   126  			addr:             "\xe0\x7e\xdc\xba",
   127  			expectedLinkAddr: "\x01\x00\x5e\x7e\xdc\xba",
   128  		},
   129  		{
   130  			name:             "IPv4 Multicast with 24th bit set",
   131  			addr:             "\xe0\xfe\xdc\xba",
   132  			expectedLinkAddr: "\x01\x00\x5e\x7e\xdc\xba",
   133  		},
   134  	}
   135  
   136  	for _, test := range tests {
   137  		t.Run(test.name, func(t *testing.T) {
   138  			if got := EthernetAddressFromMulticastIPv4Address(tcpip.AddrFrom4Slice([]byte(test.addr))); got != test.expectedLinkAddr {
   139  				t.Fatalf("got EthernetAddressFromMulticastIPv4Address(%s) = %s, want = %s", test.addr, got, test.expectedLinkAddr)
   140  			}
   141  		})
   142  	}
   143  }
   144  
   145  func TestEthernetAddressFromMulticastIPv6Address(t *testing.T) {
   146  	addr := testutil.MustParse6("ff02:304:506:708:90a:b0c:d0e:f1a")
   147  	if got, want := EthernetAddressFromMulticastIPv6Address(tcpip.AddrFrom16Slice(addr.AsSlice())), tcpip.LinkAddress("\x33\x33\x0d\x0e\x0f\x1a"); got != want {
   148  		t.Fatalf("got EthernetAddressFromMulticastIPv6Address(%s) = %s, want = %s", addr, got, want)
   149  	}
   150  }