// LinkSubscribe takes a chan down which notifications will be sent
// when links change. Close the 'done' chan to stop subscription.
func LinkSubscribe(ch chan<- LinkUpdate, done <-chan struct{}) error {
s, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_LINK)
if err != nil {
return err
}
if done != nil {
go func() {
<-done
s.Close()
}()
}
go func() {
defer close(ch)
for {
msgs, err := s.Receive()
if err != nil {
return
}
for _, m := range msgs {
ifmsg := nl.DeserializeIfInfomsg(m.Data)
link, err := linkDeserialize(m.Data)
if err != nil {
return
}
ch <- LinkUpdate{IfInfomsg: *ifmsg, Link: link}
}
}
}()
return nil
}
// RouteSubscribe takes a chan down which notifications will be sent
// when routes are added or deleted. Close the 'done' chan to stop subscription.
func RouteSubscribe(ch chan<- RouteUpdate, done <-chan struct{}) error {
s, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_IPV4_ROUTE, syscall.RTNLGRP_IPV6_ROUTE)
if err != nil {
return err
}
if done != nil {
go func() {
<-done
s.Close()
}()
}
go func() {
defer close(ch)
for {
msgs, err := s.Receive()
if err != nil {
return
}
for _, m := range msgs {
route, err := deserializeRoute(m.Data)
if err != nil {
return
}
ch <- RouteUpdate{Type: m.Header.Type, Route: route}
}
}
}()
return nil
}
func (dev *vxlanDevice) MonitorMisses(misses chan *netlink.Neigh) {
nlsock, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_NEIGH)
if err != nil {
log.Error("Failed to subscribe to netlink RTNLGRP_NEIGH messages")
return
}
for {
msgs, err := nlsock.Receive()
if err != nil {
log.Errorf("Failed to receive from netlink: %v ", err)
time.Sleep(1 * time.Second)
continue
}
for _, msg := range msgs {
dev.processNeighMsg(msg, misses)
}
}
}