112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
package subnet
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import (
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"fmt"
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"os"
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"git.g3e.fr/syonad/two/internal/ebtables"
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"git.g3e.fr/syonad/two/internal/netif"
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"git.g3e.fr/syonad/two/internal/netns"
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"git.g3e.fr/syonad/two/pkg/db/kv"
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"git.g3e.fr/syonad/two/pkg/systemd"
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"github.com/dgraph-io/badger/v4"
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)
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func DeleteSubnet(db *badger.DB, subnetName string) error {
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state, err := kv.GetFromDB(db, "subnet/"+subnetName+"/state")
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if err != nil {
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return err
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}
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if state != "deleting" {
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return nil
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}
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d, err := loadSubnet(db, subnetName)
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if err != nil {
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return err
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}
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if err := stopDHCP(db, subnetName, d); err != nil {
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return err
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}
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switch d.mode {
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case "vxlan":
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if err := deleteSubnetVxlan(d); err != nil {
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return err
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}
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case "bridge":
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if err := deleteSubnetBridge(d); err != nil {
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return err
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}
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default:
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return fmt.Errorf("unknown subnet mode %q", d.mode)
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}
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return kv.AddInDB(db, "subnet/"+subnetName+"/state", "deleted")
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}
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func stopDHCP(db *badger.DB, subnetName string, d subnetData) error {
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svc, err := systemd.New()
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if err != nil {
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return fmt.Errorf("connect to systemd: %w", err)
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}
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defer svc.Close()
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if err := svc.Stop("dnsmasq@" + d.vpc + "_" + d.bridge + ".service"); err != nil {
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return fmt.Errorf("stop dnsmasq: %w", err)
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}
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if err := os.Remove("/etc/dnsmasq.d/" + d.vpc + "_" + d.bridge + ".conf"); err != nil && !os.IsNotExist(err) {
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return fmt.Errorf("remove dnsmasq config: %w", err)
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}
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if err := kv.DeleteInDB(db, "subnet/"+subnetName+"/dhcp"); err != nil {
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return fmt.Errorf("delete dhcp entries: %w", err)
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}
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return nil
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}
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func deleteSubnetVxlan(d subnetData) error {
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vxlanIface := fmt.Sprintf("vxlan-%d", d.vxlanID)
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if err := ebtables.DeleteARPToGateway(d.bridge, d.interfaceIP.String()); err != nil {
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return fmt.Errorf("delete ebtables arp rule: %w", err)
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}
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if err := ebtables.DeleteDHCP(d.bridge); err != nil {
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return fmt.Errorf("delete ebtables dhcp rule: %w", err)
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}
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if err := netns.Call(d.vpc, func() error {
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return netif.DeleteLink(d.bridge)
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}); err != nil {
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return fmt.Errorf("delete bridge in netns: %w", err)
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}
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if err := netif.DeleteLink(vxlanIface); err != nil {
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return fmt.Errorf("delete vxlan: %w", err)
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}
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if err := netif.DeleteLink("v-" + d.subnetID + "-e"); err != nil {
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return fmt.Errorf("delete veth: %w", err)
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}
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if err := netif.DeleteLink(d.bridge); err != nil {
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return fmt.Errorf("delete bridge: %w", err)
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}
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return nil
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}
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func deleteSubnetBridge(d subnetData) error {
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if err := netns.Call(d.vpc, func() error {
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return netif.DeleteLink(d.bridge)
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}); err != nil {
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return fmt.Errorf("delete bridge in netns: %w", err)
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}
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if err := netif.DeleteLink("v-" + d.subnetID + "-e"); err != nil {
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return fmt.Errorf("delete veth: %w", err)
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}
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return nil
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}
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