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package kernel
import (
"github.com/bio-routing/bio-rd/net"
"github.com/bio-routing/bio-rd/route"
"github.com/pkg/errors"
"github.com/vishvananda/netlink"
bnet "github.com/bio-routing/bio-rd/net"
)
const (
protoBio = 45
)
func (k *Kernel) init() error {
lk, err := newLinuxKernel()
if err != nil {
return errors.Wrap(err, "Unable to initialize linux kernel")
}
err = lk.init()
if err != nil {
return errors.Wrap(err, "Init failed")
}
k.osKernel = lk
return nil
}
func (k *Kernel) uninit() error {
return k.osKernel.uninit()
}
type linuxKernel struct {
h *netlink.Handle
routes map[bnet.Prefix]struct{}
}
func newLinuxKernel() (*linuxKernel, error) {
h, err := netlink.NewHandle()
if err != nil {
return nil, errors.Wrap(err, "Unable to get Netlink handle")
}
return &linuxKernel{
h: h,
routes: make(map[bnet.Prefix]struct{}),
}, nil
}
func (lk *linuxKernel) init() error {
err := lk.cleanup()
if err != nil {
return errors.Wrap(err, "Cleanup failed")
}
return nil
}
func (lk *linuxKernel) uninit() error {
return lk.cleanup()
}
func (lk *linuxKernel) cleanup() error {
filter := &netlink.Route{
Protocol: protoBio,
}
routes, err := lk.h.RouteListFiltered(0, filter, netlink.RT_FILTER_PROTOCOL)
if err != nil {
return errors.Wrap(err, "Unable to get routes")
}
for i := range routes {
err = lk.h.RouteDel(&routes[i])
if err != nil {
return errors.Wrap(err, "Unable to remove route")
}
}
return nil
}
func (lk *linuxKernel) AddPath(pfx net.Prefix, path *route.Path) error {
r := &netlink.Route{
Protocol: protoBio,
Dst: pfx.GetIPNet(),
Gw: path.NextHop().ToNetIP(),
}
if _, found := lk.routes[pfx]; !found {
err := lk.h.RouteAdd(r)
if err != nil {
return errors.Wrap(err, "Unable to add route")
}
lk.routes[pfx] = struct{}{}
return nil
}
err := lk.h.RouteReplace(r)
if err != nil {
return errors.Wrap(err, "Unable to replace route")
}
return nil
}
func (lk *linuxKernel) RemovePath(pfx net.Prefix, path *route.Path) bool {
if _, found := lk.routes[pfx]; !found {
return false
}
r := &netlink.Route{
Protocol: protoBio,
Dst: pfx.GetIPNet(),
Gw: path.NextHop().ToNetIP(),
}
err := lk.h.RouteDel(r)
if err != nil {
return false
}
delete(lk.routes, pfx)
return true
}