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package device
import (
"fmt"
bnet "github.com/bio-routing/bio-rd/net"
log "github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
)
func (ds *Server) loadAdapter() error {
a, err := newOSAdapterLinux(ds)
if err != nil {
return fmt.Errorf("Unable to create linux adapter: %v", err)
}
ds.osAdapter = a
return nil
}
type osAdapterLinux struct {
srv *Server
handle *netlink.Handle
done chan struct{}
}
func newOSAdapterLinux(srv *Server) (*osAdapterLinux, error) {
o := &osAdapterLinux{
srv: srv,
}
h, err := netlink.NewHandle()
if err != nil {
return nil, fmt.Errorf("Failed to create netlink handle: %v", err)
}
o.handle = h
return o, nil
}
func (o *osAdapterLinux) start() error {
chLU := make(chan netlink.LinkUpdate)
err := netlink.LinkSubscribe(chLU, o.done)
if err != nil {
return fmt.Errorf("Unable to subscribe for link updates: %v", err)
}
chAU := make(chan netlink.AddrUpdate)
err = netlink.AddrSubscribe(chAU, o.done)
if err != nil {
return fmt.Errorf("Unable to subscribe for address updates: %v", err)
}
err = o.init()
if err != nil {
return fmt.Errorf("Init failed: %v", err)
}
go o.monitorLinks(chLU)
go o.monitorAddrs(chAU)
return nil
}
func (o *osAdapterLinux) init() error {
links, err := o.handle.LinkList()
if err != nil {
return fmt.Errorf("Unable to get links: %v", err)
}
for _, l := range links {
d := linkUpdateToDevice(l.Attrs())
for _, f := range []int{4, 6} {
addrs, err := o.handle.AddrList(l, f)
if err != nil {
return fmt.Errorf("Unable to get addresses for interface %s: %v", d.Name, err)
}
for _, addr := range addrs {
d.Addrs = append(d.Addrs, bnet.NewPfxFromIPNet(addr.IPNet))
}
}
o.srv.addDevice(d)
}
return nil
}
func (o *osAdapterLinux) monitorAddrs(chAU chan netlink.AddrUpdate) {
for {
select {
case <-o.done:
return
case au := <-chAU:
o.processAddrUpdate(&au)
}
}
}
func (o *osAdapterLinux) monitorLinks(chLU chan netlink.LinkUpdate) {
for {
select {
case <-o.done:
return
case lu := <-chLU:
o.processLinkUpdate(&lu)
}
}
return
}
func linkUpdateToDevice(attrs *netlink.LinkAttrs) *Device {
return &Device{
Index: uint64(attrs.Index),
MTU: uint16(attrs.MTU),
Name: attrs.Name,
HardwareAddr: attrs.HardwareAddr,
Flags: attrs.Flags,
OperState: uint8(attrs.OperState),
}
}
func (o *osAdapterLinux) processAddrUpdate(au *netlink.AddrUpdate) {
o.srv.devicesMu.RLock()
defer o.srv.devicesMu.RUnlock()
if _, ok := o.srv.devices[uint64(au.LinkIndex)]; !ok {
log.Warningf("Received address update for non existent device index %d", au.LinkIndex)
return
}
d := o.srv.devices[uint64(au.LinkIndex)]
if au.NewAddr {
d.addAddr(bnet.NewPfxFromIPNet(&au.LinkAddress))
return
}
d.delAddr(bnet.NewPfxFromIPNet(&au.LinkAddress))
}
func (o *osAdapterLinux) processLinkUpdate(lu *netlink.LinkUpdate) {
attrs := lu.Attrs()
o.srv.devicesMu.Lock()
defer o.srv.devicesMu.Unlock()
if _, ok := o.srv.devices[uint64(attrs.Index)]; !ok {
d := newDevice()
d.Index = uint64(attrs.Index)
o.srv.addDevice(d)
}
o.srv.devices[uint64(attrs.Index)].updateLink(attrs)
o.srv.notify(uint64(attrs.Index))
if attrs.OperState == netlink.OperNotPresent {
o.srv.delDevice(uint64(attrs.Index))
return
}
}