forked from vishvananda/netlink
-
Notifications
You must be signed in to change notification settings - Fork 0
/
xfrm_monitor_linux.go
105 lines (85 loc) · 1.87 KB
/
xfrm_monitor_linux.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
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
100
101
102
103
104
105
package netlink
import (
"fmt"
"syscall"
"github.com/vishvananda/netlink/nl"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
)
type XfrmMsg interface {
Type() nl.XfrmMsgType
}
type XfrmMsgExpire struct {
XfrmState *XfrmState
Hard bool
}
func (ue *XfrmMsgExpire) Type() nl.XfrmMsgType {
return nl.XFRM_MSG_EXPIRE
}
func parseXfrmMsgExpire(b []byte) *XfrmMsgExpire {
var e XfrmMsgExpire
msg := nl.DeserializeXfrmUserExpire(b)
e.XfrmState = xfrmStateFromXfrmUsersaInfo(&msg.XfrmUsersaInfo)
e.Hard = msg.Hard == 1
return &e
}
func XfrmMonitor(ch chan<- XfrmMsg, done <-chan struct{}, errorChan chan<- error,
types ...nl.XfrmMsgType) error {
groups, err := xfrmMcastGroups(types)
if err != nil {
return nil
}
s, err := nl.SubscribeAt(netns.None(), netns.None(), unix.NETLINK_XFRM, groups...)
if err != nil {
return err
}
if done != nil {
go func() {
<-done
s.Close()
}()
}
go func() {
defer close(ch)
for {
msgs, from, err := s.Receive()
if err != nil {
if err == syscall.EAGAIN {
continue
}
errorChan <- err
return
}
if from.Pid != nl.PidKernel {
errorChan <- fmt.Errorf("Wrong sender portid %d, expected %d", from.Pid, nl.PidKernel)
return
}
for _, m := range msgs {
switch m.Header.Type {
case nl.XFRM_MSG_EXPIRE:
ch <- parseXfrmMsgExpire(m.Data)
default:
errorChan <- fmt.Errorf("unsupported msg type: %x", m.Header.Type)
}
}
}
}()
return nil
}
func xfrmMcastGroups(types []nl.XfrmMsgType) ([]uint, error) {
groups := make([]uint, 0)
if len(types) == 0 {
return nil, fmt.Errorf("no xfrm msg type specified")
}
for _, t := range types {
var group uint
switch t {
case nl.XFRM_MSG_EXPIRE:
group = nl.XFRMNLGRP_EXPIRE
default:
return nil, fmt.Errorf("unsupported group: %x", t)
}
groups = append(groups, group)
}
return groups, nil
}