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ovn-nb-dhcp_options.go
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ovn-nb-dhcp_options.go
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package ovs
import (
"context"
"fmt"
"strings"
"github.com/ovn-org/libovsdb/ovsdb"
"k8s.io/klog/v2"
kubeovnv1 "github.com/kubeovn/kube-ovn/pkg/apis/kubeovn/v1"
"github.com/kubeovn/kube-ovn/pkg/ovsdb/ovnnb"
"github.com/kubeovn/kube-ovn/pkg/util"
)
type DHCPOptionsUUIDs struct {
DHCPv4OptionsUUID string
DHCPv6OptionsUUID string
}
func (c *OVNNbClient) CreateDHCPOptions(lsName, cidr, options string) error {
dhcpOpt, err := newDHCPOptions(lsName, cidr, options)
if err != nil {
klog.Error(err)
return err
}
op, err := c.ovsDbClient.Create(dhcpOpt)
if err != nil {
klog.Error(err)
return fmt.Errorf("generate operations for creating dhcp options 'cidr %s options %s': %v", cidr, options, err)
}
if err = c.Transact("dhcp-create", op); err != nil {
klog.Error(err)
return fmt.Errorf("create dhcp options with cidr %q options %q: %v", cidr, options, err)
}
return nil
}
func (c *OVNNbClient) UpdateDHCPOptions(subnet *kubeovnv1.Subnet, mtu int) (*DHCPOptionsUUIDs, error) {
lsName := subnet.Name
cidrBlock := subnet.Spec.CIDRBlock
gateway := subnet.Spec.Gateway
enableDHCP := subnet.Spec.EnableDHCP
/* delete dhcp options */
if !enableDHCP {
if err := c.DeleteDHCPOptions(lsName, subnet.Spec.Protocol); err != nil {
return nil, fmt.Errorf("delete dhcp options for logical switch %s: %v", lsName, err)
}
return &DHCPOptionsUUIDs{}, nil
}
/* update dhcp options*/
var v4CIDR, v6CIDR string
var v4Gateway string
switch util.CheckProtocol(cidrBlock) {
case kubeovnv1.ProtocolIPv4:
v4CIDR = cidrBlock
v4Gateway = gateway
case kubeovnv1.ProtocolIPv6:
v6CIDR = cidrBlock
case kubeovnv1.ProtocolDual:
cidrBlocks := strings.Split(cidrBlock, ",")
gateways := strings.Split(gateway, ",")
v4CIDR, v6CIDR = cidrBlocks[0], cidrBlocks[1]
v4Gateway = gateways[0]
}
dhcpOptionsUUIDs := &DHCPOptionsUUIDs{}
if len(v4CIDR) != 0 {
dhcpV4OptUUID, err := c.updateDHCPv4Options(lsName, v4CIDR, v4Gateway, subnet.Spec.DHCPv4Options, mtu)
if err != nil {
klog.Error(err)
return nil, fmt.Errorf("update IPv4 dhcp options for logical switch %s: %v", lsName, err)
}
dhcpOptionsUUIDs.DHCPv4OptionsUUID = dhcpV4OptUUID
}
if len(v6CIDR) != 0 {
dhcpV6OptUUID, err := c.updateDHCPv6Options(lsName, v6CIDR, subnet.Spec.DHCPv6Options)
if err != nil {
klog.Error(err)
return nil, fmt.Errorf("update IPv6 dhcp options for logical switch %s: %v", lsName, err)
}
dhcpOptionsUUIDs.DHCPv6OptionsUUID = dhcpV6OptUUID
}
return dhcpOptionsUUIDs, nil
}
func (c *OVNNbClient) updateDHCPv4Options(lsName, cidr, gateway, options string, mtu int) (uuid string, err error) {
protocol := util.CheckProtocol(cidr)
if protocol != kubeovnv1.ProtocolIPv4 {
return "", fmt.Errorf("cidr %s must be a valid ipv4 address", cidr)
}
dhcpOpt, err := c.GetDHCPOptions(lsName, protocol, true)
if err != nil {
klog.Error(err)
return
}
if len(options) == 0 {
mac := util.GenerateMac()
if dhcpOpt != nil && len(dhcpOpt.Options) != 0 {
mac = dhcpOpt.Options["server_mac"]
}
options = fmt.Sprintf("lease_time=%d,router=%s,server_id=%s,server_mac=%s,mtu=%d", 3600, gateway, "169.254.0.254", mac, mtu)
}
/* update */
if dhcpOpt != nil {
dhcpOpt.Cidr = cidr
dhcpOpt.Options = parseDHCPOptions(options)
return dhcpOpt.UUID, c.updateDHCPOptions(dhcpOpt, &dhcpOpt.Cidr, &dhcpOpt.Options)
}
/* create */
if err := c.CreateDHCPOptions(lsName, cidr, options); err != nil {
return "", fmt.Errorf("create dhcp options: %v", err)
}
dhcpOpt, err = c.GetDHCPOptions(lsName, protocol, false)
if err != nil {
klog.Error(err)
return "", err
}
return dhcpOpt.UUID, nil
}
func (c *OVNNbClient) updateDHCPv6Options(lsName, cidr, options string) (uuid string, err error) {
protocol := util.CheckProtocol(cidr)
if protocol != kubeovnv1.ProtocolIPv6 {
return "", fmt.Errorf("cidr %s must be a valid ipv4 address", cidr)
}
dhcpOpt, err := c.GetDHCPOptions(lsName, protocol, true)
if err != nil {
klog.Error(err)
return
}
if len(options) == 0 {
mac := util.GenerateMac()
if dhcpOpt != nil && len(dhcpOpt.Options) != 0 {
mac = dhcpOpt.Options["server_id"]
}
options = fmt.Sprintf("server_id=%s", mac)
}
/* update */
if dhcpOpt != nil {
dhcpOpt.Cidr = cidr
dhcpOpt.Options = parseDHCPOptions(options)
return dhcpOpt.UUID, c.updateDHCPOptions(dhcpOpt, &dhcpOpt.Cidr, &dhcpOpt.Options)
}
/* create */
if err := c.CreateDHCPOptions(lsName, cidr, options); err != nil {
return "", fmt.Errorf("create dhcp options: %v", err)
}
dhcpOpt, err = c.GetDHCPOptions(lsName, protocol, false)
if err != nil {
klog.Error(err)
return "", err
}
return dhcpOpt.UUID, nil
}
// updateDHCPOptions update dhcp options
func (c *OVNNbClient) updateDHCPOptions(dhcpOpt *ovnnb.DHCPOptions, fields ...interface{}) error {
if dhcpOpt == nil {
return fmt.Errorf("dhcp_options is nil")
}
op, err := c.ovsDbClient.Where(dhcpOpt).Update(dhcpOpt, fields...)
if err != nil {
klog.Error(err)
return fmt.Errorf("generate operations for updating dhcp options %s: %v", dhcpOpt.UUID, err)
}
if err = c.Transact("dhcp-options-update", op); err != nil {
return fmt.Errorf("update dhcp options %s: %v", dhcpOpt.UUID, err)
}
return nil
}
// DeleteDHCPOptionsByUUIDs delete dhcp options by uuid
func (c *OVNNbClient) DeleteDHCPOptionsByUUIDs(uuidList ...string) error {
ops := make([]ovsdb.Operation, 0, len(uuidList))
for _, uuid := range uuidList {
dhcpOptions := &ovnnb.DHCPOptions{
UUID: uuid,
}
op, err := c.Where(dhcpOptions).Delete()
if err != nil {
klog.Error(err)
return err
}
ops = append(ops, op...)
}
if err := c.Transact("dhcp-options-del", ops); err != nil {
return fmt.Errorf("delete dhcp options %v: %v", uuidList, err)
}
return nil
}
// DeleteDHCPOptions delete dhcp options which belongs to logical switch
func (c *OVNNbClient) DeleteDHCPOptions(lsName, protocol string) error {
if protocol == kubeovnv1.ProtocolDual {
protocol = ""
}
externalIDs := map[string]string{
logicalSwitchKey: lsName,
"protocol": protocol, // list all protocol dhcp options when protocol is ""
}
op, err := c.WhereCache(dhcpOptionsFilter(true, externalIDs)).Delete()
if err != nil {
klog.Error(err)
return fmt.Errorf("generate operation for deleting dhcp options: %v", err)
}
if err = c.Transact("dhcp-options-del", op); err != nil {
klog.Error(err)
return fmt.Errorf("delete logical switch %s dhcp options: %v", lsName, err)
}
return nil
}
// GetDHCPOptions get dhcp options,
// a dhcp options is uniquely identified by switch(lsName) and protocol
func (c *OVNNbClient) GetDHCPOptions(lsName, protocol string, ignoreNotFound bool) (*ovnnb.DHCPOptions, error) {
if len(lsName) == 0 {
return nil, fmt.Errorf("the logical router name is required")
}
if protocol != kubeovnv1.ProtocolIPv4 && protocol != kubeovnv1.ProtocolIPv6 {
return nil, fmt.Errorf("protocol must be IPv4 or IPv6")
}
dhcpOptList, err := c.ListDHCPOptions(true, map[string]string{
logicalSwitchKey: lsName,
"protocol": protocol,
})
if err != nil {
klog.Error(err)
return nil, fmt.Errorf("get logical switch %s %s dhcp options: %v", lsName, protocol, err)
}
// not found
if len(dhcpOptList) == 0 {
if ignoreNotFound {
return nil, nil
}
return nil, fmt.Errorf("not found logical switch %s %s dhcp options: %v", lsName, protocol, err)
}
if len(dhcpOptList) > 1 {
return nil, fmt.Errorf("more than one %s dhcp options in logical switch %s", protocol, lsName)
}
return &dhcpOptList[0], nil
}
// ListDHCPOptions list dhcp options which match the given externalIDs
func (c *OVNNbClient) ListDHCPOptions(needVendorFilter bool, externalIDs map[string]string) ([]ovnnb.DHCPOptions, error) {
ctx, cancel := context.WithTimeout(context.Background(), c.Timeout)
defer cancel()
dhcpOptList := make([]ovnnb.DHCPOptions, 0)
if err := c.WhereCache(dhcpOptionsFilter(needVendorFilter, externalIDs)).List(ctx, &dhcpOptList); err != nil {
return nil, fmt.Errorf("list dhcp options with external IDs %v: %v", externalIDs, err)
}
return dhcpOptList, nil
}
func (c *OVNNbClient) DHCPOptionsExists(lsName, cidr string) (bool, error) {
dhcpOpt, err := c.GetDHCPOptions(lsName, cidr, true)
return dhcpOpt != nil, err
}
// newDHCPOptions return dhcp options with basic information
func newDHCPOptions(lsName, cidr, options string) (*ovnnb.DHCPOptions, error) {
if len(cidr) == 0 || len(lsName) == 0 {
return nil, fmt.Errorf("logical switch name %s and cidr %s is required", lsName, cidr)
}
protocol := util.CheckProtocol(cidr)
if len(protocol) == 0 {
return nil, fmt.Errorf("cidr %s must be a valid ipv4 or ipv6 address", cidr)
}
return &ovnnb.DHCPOptions{
Cidr: cidr,
ExternalIDs: map[string]string{
logicalSwitchKey: lsName,
"protocol": protocol,
"vendor": util.CniTypeName,
},
Options: parseDHCPOptions(options),
}, nil
}
// dhcpOptionsFilter filter dhcp options which match the given externalIDs,
// result should include all dhcp options when externalIDs is empty,
// result should include all dhcp options which externalIDs[key] is not empty when externalIDs[key] is ""
func dhcpOptionsFilter(needVendorFilter bool, externalIDs map[string]string) func(dhcpOpt *ovnnb.DHCPOptions) bool {
return func(dhcpOpt *ovnnb.DHCPOptions) bool {
if needVendorFilter && (len(dhcpOpt.ExternalIDs) == 0 || dhcpOpt.ExternalIDs["vendor"] != util.CniTypeName) {
return false
}
if len(dhcpOpt.ExternalIDs) < len(externalIDs) {
return false
}
if len(dhcpOpt.ExternalIDs) != 0 {
for k, v := range externalIDs {
// if only key exist but not value in externalIDs, we should include this dhcp options,
// it's equal to shell command `ovn-nbctl --columns=xx find dhcp_options external_ids:key!=\"\"`
if len(v) == 0 {
if len(dhcpOpt.ExternalIDs[k]) == 0 {
return false
}
} else {
if dhcpOpt.ExternalIDs[k] != v {
return false
}
}
}
}
return true
}
}