Example #1
0
func (self *LinkHandler) SetLinkState(flag link.Flags) (err error) {
	var qry *netlink.Message
	if hdr, ok := self.cache.Header.(*link.Header); ok {
		// While rtnetlink(7) says changes should always be IFF_QUERY, it has some
		// behaviours that are undocumented - like limiting actions on SETLINK's to
		// specific FLAGs.
		hdr = link.NewHeader(hdr.InterfaceFamily(), hdr.InterfaceType(), hdr.InterfaceIndex(), flag&link.IFF_UP, link.IFF_UP)
		msg := rtnetlink.Message{Header: hdr}
		qry, err = netlink.NewMessage(rtnetlink.RTM_SETLINK, netlink.NLM_F_ACK|netlink.NLM_F_REQUEST, msg)
	} else {
		err = errors.New("Cant set link flags (invalid cache)")
	}
	if err != nil {
		return
	}
	mch, err := self.h.Query(*qry, 1)
	if err == nil {
		for m := range mch {
			switch m.Header.MessageType() {
			case netlink.NLMSG_ERROR:
				emsg := &netlink.Error{}
				err = emsg.UnmarshalNetlink(m.Body)
				if err == nil && emsg.Code() != 0 {
					err = emsg
				}
			default:
				err = errors.New("Unexpected netlink message")
				log.Printf("NetlinkError: %v", err)
			}
		}
		close(mch)
	}
	return
}
Example #2
0
func (self *linkFinder) GetLinkByID(i uint32) (lh *LinkHandler, err error) {
	qry, err := netlink.NewMessage(rtnetlink.RTM_GETLINK, netlink.NLM_F_REQUEST,
		link.NewHeader(rtnetlink.AF_UNSPEC, 0, i, 0, 0))
	if err == nil {
		var mch chan netlink.Message
		mch, err = self.h.Query(*qry, 1)
		if err == nil {
			for ii := range mch {
				switch ii.Header.MessageType() {
				default:
					err = errors.New("Unknown message type in response to RTM_GETLINK")
				case netlink.NLMSG_ERROR:
					emsg := &netlink.Error{}
					err = emsg.UnmarshalNetlink(ii.Body)
					if err == nil && emsg.Code() != 0 {
						err = emsg
					}
				case rtnetlink.RTM_NEWLINK:
					lhdr := &link.Header{}
					msg := &rtnetlink.Message{Header: lhdr}
					err = msg.UnmarshalNetlink(ii.Body)
					if err == nil {
						lh = &LinkHandler{h: self.h, cache: msg}
					}
				}
			}
			close(mch)
		}
	}
	return
}
Example #3
0
func (self *linkFinder) GetLinks() (lhs []*LinkHandler, err error) {
	qry, err := netlink.NewMessage(rtnetlink.RTM_GETLINK, netlink.NLM_F_REQUEST|netlink.NLM_F_ROOT,
		link.NewHeader(rtnetlink.AF_UNSPEC, 0, 0, 0, 0))
	if err != nil {
		return
	}
	var mch chan netlink.Message
	mch, err = self.h.Query(*qry, 1)
	if err == nil {
		for ii := range mch {
			if ii.Header.MessageType() == netlink.NLMSG_DONE {
				break
			}
			switch ii.Header.MessageType() {
			default:
				err = errors.New("Unknown message type in response to RTM_GETLINK")
			case netlink.NLMSG_ERROR:
				emsg := &netlink.Error{}
				err = emsg.UnmarshalNetlink(ii.Body)
				if err == nil && emsg.Code() != 0 {
					err = emsg
				}
			case rtnetlink.RTM_NEWLINK:
				lhdr := &link.Header{}
				msg := &rtnetlink.Message{Header: lhdr}
				err = msg.UnmarshalNetlink(ii.Body)
				if err == nil {
					lhs = append(lhs, &LinkHandler{h: self.h, cache: msg})
				}
			}
			if err != nil {
				log.Printf("Internal netlink failure: %v", err)
			}
		}
	}
	close(mch)
	return
}