func (manager *LinkManager) netlinkMessageReceived(msg *netlink.Message) {
switch msg.Header.MessageType() {
case rtnetlink.RTM_NEWLINK, rtnetlink.RTM_GETLINK:
rtmsg, err := link.ParseMessage(*msg)
if err != nil {
log.Printf("Can't parse link message: %v", err)
break
}
hdr, _ := rtmsg.Header.(*link.Header)
ifIndex := hdr.InterfaceIndex()
link := manager.links[ifIndex]
if link == nil {
link := &LinkHandler{cache: rtmsg, addresses: make([]*net.IP, 0, 5)}
manager.links[hdr.InterfaceIndex()] = link
manager.interfaceChanged(rtmsg, link, true)
} else {
link.cache = rtmsg
manager.interfaceChanged(rtmsg, link, false)
}
case rtnetlink.RTM_DELLINK:
manager.linkRemoved(msg)
case rtnetlink.RTM_NEWADDR, rtnetlink.RTM_GETADDR:
manager.addrReceived(msg)
case rtnetlink.RTM_DELADDR:
manager.addressRemoved(msg)
case rtnetlink.RTM_NEWROUTE, rtnetlink.RTM_GETROUTE:
manager.routeAdded(msg)
case netlink.NLMSG_UNSPECIFIED:
log.Printf("Received unspecified message. Header: %v Body %v", msg.Header, msg.Body)
case netlink.NLMSG_DONE:
// DO nothing with this.
}
}
func (manager *LinkManager) linkRemoved(msg *netlink.Message) {
rtmsg, err := link.ParseMessage(*msg)
hdr, _ := rtmsg.Header.(*link.Header)
if err != nil {
log.Printf("Can't unmarshall rtnetlink message: %v", err)
}
link := manager.links[hdr.InterfaceIndex()]
delete(manager.links, hdr.InterfaceIndex())
env := manager.createEmitEnv(link)
manager.upstartController.Emit("net-device-removed", env, false)
}