/
wireguard.go
54 lines (47 loc) · 1.48 KB
/
wireguard.go
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
//go:build linux
package netlink
import (
"fmt"
"github.com/qdm12/gluetun/internal/mod"
"github.com/vishvananda/netlink"
)
func (n *NetLink) IsWireguardSupported() (ok bool, err error) {
// Check for Wireguard family without loading the wireguard module.
// Some kernels have the wireguard module built-in, and don't have a
// modules directory, such as WSL2 kernels.
ok, err = hasWireguardFamily()
if err != nil {
return false, fmt.Errorf("checking for wireguard family: %w", err)
}
if ok {
return true, nil
}
// Try loading the wireguard module, since some systems do not load
// it after a boot. If this fails, wireguard is assumed to not be supported.
n.debugLogger.Debugf("wireguard family not found, trying to load wireguard kernel module")
err = mod.Probe("wireguard")
if err != nil {
n.debugLogger.Debugf("failed loading wireguard kernel module: %s", err)
return false, nil
}
n.debugLogger.Debugf("wireguard kernel module loaded successfully")
// Re-check if the Wireguard family is now available, after loading
// the wireguard kernel module.
ok, err = hasWireguardFamily()
if err != nil {
return false, fmt.Errorf("checking for wireguard family: %w", err)
}
return ok, nil
}
func hasWireguardFamily() (ok bool, err error) {
families, err := netlink.GenlFamilyList()
if err != nil {
return false, fmt.Errorf("listing gen 1 families: %w", err)
}
for _, family := range families {
if family.Name == "wireguard" {
return true, nil
}
}
return false, nil
}