1package netlink
2
3import (
4	"fmt"
5	"syscall"
6
7	"github.com/vishvananda/netlink/nl"
8)
9
10func LinkGetProtinfo(link Link) (Protinfo, error) {
11	base := link.Attrs()
12	ensureIndex(base)
13	var pi Protinfo
14	req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
15	msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
16	req.AddData(msg)
17	msgs, err := req.Execute(syscall.NETLINK_ROUTE, 0)
18	if err != nil {
19		return pi, err
20	}
21
22	for _, m := range msgs {
23		ans := nl.DeserializeIfInfomsg(m)
24		if int(ans.Index) != base.Index {
25			continue
26		}
27		attrs, err := nl.ParseRouteAttr(m[ans.Len():])
28		if err != nil {
29			return pi, err
30		}
31		for _, attr := range attrs {
32			if attr.Attr.Type != syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED {
33				continue
34			}
35			infos, err := nl.ParseRouteAttr(attr.Value)
36			if err != nil {
37				return pi, err
38			}
39			var pi Protinfo
40			for _, info := range infos {
41				switch info.Attr.Type {
42				case nl.IFLA_BRPORT_MODE:
43					pi.Hairpin = byteToBool(info.Value[0])
44				case nl.IFLA_BRPORT_GUARD:
45					pi.Guard = byteToBool(info.Value[0])
46				case nl.IFLA_BRPORT_FAST_LEAVE:
47					pi.FastLeave = byteToBool(info.Value[0])
48				case nl.IFLA_BRPORT_PROTECT:
49					pi.RootBlock = byteToBool(info.Value[0])
50				case nl.IFLA_BRPORT_LEARNING:
51					pi.Learning = byteToBool(info.Value[0])
52				case nl.IFLA_BRPORT_UNICAST_FLOOD:
53					pi.Flood = byteToBool(info.Value[0])
54				}
55			}
56			return pi, nil
57		}
58	}
59	return pi, fmt.Errorf("Device with index %d not found", base.Index)
60}
61