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
|
package ip
import (
"fmt"
"net"
"github.com/vishvananda/netlink"
)
// Addr represents arguments for address protocol manipulation.
type Addr struct {
DevName string
Address *net.IPNet
Scope string
Family Family
}
// Add adds new protocol address.
func (a *Addr) Add() error {
scope, err := a.scopeNum()
if err != nil {
return err
}
err = netlink.AddrAdd(&netlink.GenericLink{
LinkAttrs: netlink.LinkAttrs{
Name: a.DevName,
},
}, &netlink.Addr{
IPNet: a.Address,
Scope: scope,
})
if err != nil {
return fmt.Errorf("Failed to add address %q: %w", a.Address.String(), err)
}
return nil
}
func (a *Addr) scopeNum() (int, error) {
var scope netlink.Scope
switch a.Scope {
case "global", "universe", "":
scope = netlink.SCOPE_UNIVERSE
case "site":
scope = netlink.SCOPE_SITE
case "link":
scope = netlink.SCOPE_LINK
case "host":
scope = netlink.SCOPE_HOST
case "nowhere":
scope = netlink.SCOPE_NOWHERE
default:
return 0, fmt.Errorf("Unknown address scope %q", a.Scope)
}
return int(scope), nil
}
// Flush flushes protocol addresses.
func (a *Addr) Flush() error {
link, err := linkByName(a.DevName)
if err != nil {
return err
}
addrs, err := netlink.AddrList(link, int(a.Family))
if err != nil {
return fmt.Errorf("Failed to get addresses for device %s: %w", a.DevName, err)
}
scope, err := a.scopeNum()
if err != nil {
return err
}
// NOTE: If this becomes a bottleneck, there appears to be support for batching those kind of changes within netlink.
for _, addr := range addrs {
if a.Scope != "" && scope != addr.Scope {
continue
}
err := netlink.AddrDel(link, &addr)
if err != nil {
return fmt.Errorf("Failed to delete address %v: %w", addr, err)
}
}
return nil
}
|
