/
linux.go
220 lines (200 loc) · 4.66 KB
/
linux.go
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//go:build linux
package resiproute
import (
"context"
"fmt"
"net"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/opensvc/om3/core/actionresdeps"
"github.com/opensvc/om3/core/provisioned"
"github.com/opensvc/om3/core/resource"
"github.com/opensvc/om3/core/status"
"github.com/vishvananda/netlink"
)
func (t T) ActionResourceDeps() []actionresdeps.Dep {
return []actionresdeps.Dep{
{Action: "start", A: t.RID(), B: t.NetNS},
{Action: "start", A: t.NetNS, B: t.RID()},
{Action: "stop", A: t.NetNS, B: t.RID()},
}
}
func (t T) LinkTo() string {
return t.NetNS
}
// Start the Resource
func (t T) Start(ctx context.Context) error {
netns, err := t.getNS()
if err != nil {
return err
}
defer netns.Close()
if err := netns.Do(func(_ ns.NetNS) error {
routes, errM := t.makeRoute()
if errM != nil {
return errM
}
if err := t.addRoutes(routes); err != nil {
return err
}
return nil
}); err != nil {
return err
}
return nil
}
// Stop the Resource
func (t T) Stop(ctx context.Context) error {
netns, err := t.getNS()
if err != nil {
return err
}
defer netns.Close()
if err := netns.Do(func(_ ns.NetNS) error {
routes, errM := t.makeRoute()
if errM != nil {
return errM
}
if err := t.delRoutes(routes); err != nil {
return err
}
return nil
}); err != nil {
return err
}
return nil
}
func (t T) getNS() (ns.NetNS, error) {
r := t.GetObjectDriver().ResourceByID(t.NetNS)
if r == nil {
return nil, fmt.Errorf("resource %s pointed by the netns keyword not found", t.NetNS)
}
i, ok := r.(resource.NetNSPather)
if !ok {
return nil, fmt.Errorf("resource %s pointed by the netns keyword does not expose a netns path", t.NetNS)
}
path, err := i.NetNSPath()
if err != nil {
return nil, err
}
return ns.GetNS(path)
}
// Status evaluates and display the Resource status and logs
func (t *T) Status(ctx context.Context) status.T {
netns, err := t.getNS()
if err != nil {
return status.Down
}
defer netns.Close()
if err := netns.Do(func(_ ns.NetNS) error {
routes, errM := t.makeRoute()
if errM != nil {
return errM
}
errV := ip.ValidateExpectedRoute(routes)
if errV != nil {
return errV
}
return nil
}); err != nil {
//t.StatusLog().Error("%v", err)
return status.Down
}
return status.Up
}
func delRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
return netlink.RouteDel(&netlink.Route{
LinkIndex: dev.Attrs().Index,
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipn,
Gw: gw,
})
}
func (t T) delRoutes(routes []*types.Route) error {
dev, errl := t.dev()
if errl != nil {
return errl
}
for _, route := range routes {
if route == nil {
continue
}
if err := ip.ValidateExpectedRoute([]*types.Route{route}); err != nil {
t.Log().Infof("route to %s dev %s already down", route.Dst.String(), dev.Attrs().Name)
return nil
}
t.Log().Infof("del route to %s dev %s", route.Dst.String(), dev.Attrs().Name)
return delRoute(&route.Dst, route.GW, dev)
}
return nil
}
func (t T) addRoutes(routes []*types.Route) error {
dev, errl := t.dev()
if errl != nil {
return errl
}
for _, route := range routes {
if route == nil {
continue
}
if err := ip.ValidateExpectedRoute([]*types.Route{route}); err == nil {
t.Log().Infof("route to %s dev %s already up", route.Dst.String(), dev.Attrs().Name)
return nil
}
t.Log().Infof("add route to %s dev %s", route.Dst, dev.Attrs().Name)
return ip.AddRoute(&route.Dst, route.GW, dev)
}
return nil
}
func (t T) makeRoute() ([]*types.Route, error) {
var routes []*types.Route
_, dst, err := net.ParseCIDR(t.To)
if err != nil {
return routes, err
}
gw := net.ParseIP(t.Gateway)
routes = append(
routes,
&types.Route{Dst: *dst, GW: gw},
)
return routes, nil
}
func (t T) dev() (netlink.Link, error) {
if t.Dev != "" {
return netlink.LinkByName(t.Dev)
}
return t.defaultDev()
}
func (t T) defaultDev() (netlink.Link, error) {
gw := net.ParseIP(t.Gateway)
ifaces, err := net.Interfaces()
if err != nil {
return nil, err
}
for _, iface := range ifaces {
ips, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, ip := range ips {
_, n, err := net.ParseCIDR(ip.String())
if err != nil {
continue
}
if n.Contains(gw) {
return netlink.LinkByName(iface.Name)
}
}
}
return nil, fmt.Errorf("could not find a netdev to reach the gateway %s", t.Gateway)
}
func (t *T) Provision(ctx context.Context) error {
return nil
}
func (t *T) Unprovision(ctx context.Context) error {
return nil
}
func (t T) Provisioned() (provisioned.T, error) {
return provisioned.NotApplicable, nil
}