1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
package quic
import (
"net"
"testing"
"github.com/stretchr/testify/require"
)
func TestIPFragmentation(t *testing.T) {
sink, err := net.ListenUDP("udp", &net.UDPAddr{Port: 0})
require.NoError(t, err)
t.Cleanup(func() { sink.Close() })
sinkPort := sink.LocalAddr().(*net.UDPAddr).Port
canSendIPv4 := func(conn *net.UDPConn) bool {
_, err := conn.WriteTo([]byte("hello"), &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: sinkPort})
return err == nil
}
canSendIPv6 := func(conn *net.UDPConn) bool {
_, err := conn.WriteTo([]byte("hello"), &net.UDPAddr{IP: net.IPv6loopback, Port: sinkPort})
return err == nil
}
t.Run("udp4", func(t *testing.T) {
conn, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0})
require.NoError(t, err)
defer conn.Close()
require.True(t, canSendIPv4(conn))
require.False(t, canSendIPv6(conn))
raw, err := conn.SyscallConn()
require.NoError(t, err)
canDF, _ := setDF(raw)
require.True(t, canDF)
})
t.Run("udp6", func(t *testing.T) {
conn, err := net.ListenUDP("udp6", &net.UDPAddr{IP: net.IPv6loopback, Port: 0})
require.NoError(t, err)
defer conn.Close()
require.False(t, canSendIPv4(conn))
require.True(t, canSendIPv6(conn))
raw, err := conn.SyscallConn()
require.NoError(t, err)
canDF, _ := setDF(raw)
require.True(t, canDF)
})
t.Run("udp, dual-stack", func(t *testing.T) {
if version, err := getMacOSVersion(); err != nil || version < macOSVersion15 {
t.Skipf("skipping on darwin %d", version-9)
}
conn, err := net.ListenUDP("udp", &net.UDPAddr{Port: 0})
require.NoError(t, err)
defer conn.Close()
require.True(t, canSendIPv4(conn))
require.True(t, canSendIPv6(conn))
raw, err := conn.SyscallConn()
require.NoError(t, err)
canDF, _ := setDF(raw)
require.True(t, canDF)
})
t.Run("udp, listening on IPv4", func(t *testing.T) {
conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0})
require.NoError(t, err)
defer conn.Close()
require.True(t, canSendIPv4(conn))
require.False(t, canSendIPv6(conn))
raw, err := conn.SyscallConn()
require.NoError(t, err)
canDF, _ := setDF(raw)
require.True(t, canDF)
})
t.Run("udp, listening on IPv6", func(t *testing.T) {
conn, err := net.ListenUDP("udp6", &net.UDPAddr{IP: net.IPv6loopback, Port: 0})
require.NoError(t, err)
defer conn.Close()
require.False(t, canSendIPv4(conn))
require.True(t, canSendIPv6(conn))
raw, err := conn.SyscallConn()
require.NoError(t, err)
canDF, _ := setDF(raw)
require.True(t, canDF)
})
}
|
