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bcc.go
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bcc.go
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package main
import (
"context"
"errors"
"fmt"
"net"
"regexp"
"strconv"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/vishvananda/netlink"
"github.com/baidubce/baiducloud-cce-cni-driver/pkg/rpc"
log "github.com/baidubce/baiducloud-cce-cni-driver/pkg/util/logger"
networkutil "github.com/baidubce/baiducloud-cce-cni-driver/pkg/util/network"
netlinkwrapper "github.com/baidubce/baiducloud-cce-cni-driver/pkg/wrapper/netlink"
)
type bccENIMultiIP struct {
name string
namespace string
netlink netlinkwrapper.Interface
}
var _ networkClient = &bccENIMultiIP{}
func (client *bccENIMultiIP) SetupNetwork(
ctx context.Context,
result *current.Result,
ipamConf *IPAMConf,
resp *rpc.AllocateIPReply,
) error {
allocRespNetworkInfo := resp.GetENIMultiIP()
if allocRespNetworkInfo == nil {
err := errors.New(fmt.Sprintf("failed to allocate IP for pod (%v %v): NetworkInfo is nil", client.namespace, client.name))
log.Errorf(ctx, err.Error())
return err
}
log.Infof(ctx, "allocate IP %v for pod(%v %v) successfully", allocRespNetworkInfo.IP, client.namespace, client.name)
allocatedIP := net.ParseIP(allocRespNetworkInfo.IP)
if allocatedIP == nil {
return fmt.Errorf("alloc IP %v format error", allocRespNetworkInfo.IP)
}
version := "4"
addrBits := 32
if allocatedIP.To4() == nil {
version = "6"
addrBits = 128
}
result.IPs = []*current.IPConfig{
{
Version: version,
Address: net.IPNet{IP: allocatedIP, Mask: net.CIDRMask(addrBits, addrBits)},
},
}
netutil := networkutil.New()
eniIntf, err := netutil.GetLinkByMacAddress(allocRespNetworkInfo.Mac)
if err != nil {
log.Errorf(ctx, "failed to get eni interface by mac: %v", err)
return err
}
log.Infof(ctx, "pod (%v %v) with IP %v is subject to interface: %v", client.namespace, client.name,
allocRespNetworkInfo.IP, eniIntf.Attrs().Name)
ethIndex, err := getENIInterfaceIndex(ipamConf.ENILinkPrefix, eniIntf)
if err != nil {
return err
}
rtTable := ipamConf.RouteTableIDOffset + ethIndex
// add to/from ip rule
// ip rule add from all to <pod> table main
// ip rule add from <pod> table XXX
allocIPNet := &net.IPNet{IP: allocatedIP, Mask: net.CIDRMask(addrBits, addrBits)}
// clean up old rule
_ = client.delToOrFromContainerRule(true, allocIPNet)
_ = client.delToOrFromContainerRule(false, allocIPNet)
// add to container rule
err = client.addToOrFromContainerRule(true, allocIPNet, toContainerRulePriority, mainRouteTableID)
if err != nil {
msg := fmt.Sprintf("failed to add to-container rule: %v", err)
log.Error(ctx, msg)
return errors.New(msg)
}
// add from container rule
err = client.addToOrFromContainerRule(false, allocIPNet, fromContainerRulePriority, rtTable)
if err != nil {
msg := fmt.Sprintf("failed to add from-container rule: %v", err)
log.Error(ctx, msg)
return errors.New(msg)
}
log.Infof(ctx, "add to/from ip rule for pod (%v %v) successfully", client.namespace, client.name)
// del eni scope link route
if ipamConf.DeleteENIScopeLinkRoute {
_ = client.delScopeLinkRoute(eniIntf)
}
// check whether eni is working
eniErr := client.validateEni(eniIntf, rtTable)
if eniErr != nil {
return fmt.Errorf("eni isn't working: %s", eniErr)
}
return nil
}
func (client *bccENIMultiIP) TeardownNetwork(
ctx context.Context,
ipamConf *IPAMConf,
resp *rpc.ReleaseIPReply,
) error {
releaseRespNetworkInfo := resp.GetENIMultiIP()
if releaseRespNetworkInfo == nil {
return nil
}
log.Infof(ctx, "release IP %v for pod(%v %v) successfully", releaseRespNetworkInfo.IP, client.namespace, client.name)
releaseIP := net.ParseIP(releaseRespNetworkInfo.IP)
if releaseIP == nil {
return fmt.Errorf("release IP %v format error", releaseRespNetworkInfo.IP)
}
addrBits := 32
if releaseIP.To4() == nil {
addrBits = 128
}
releaseIPNet := &net.IPNet{IP: releaseIP, Mask: net.CIDRMask(addrBits, addrBits)}
err := client.delToOrFromContainerRule(true, releaseIPNet)
if err != nil && !netlinkwrapper.IsNotExistError(err) {
msg := fmt.Sprintf("failed to delete to-container rule: %v", err)
log.Error(ctx, msg)
return errors.New(msg)
}
err = client.delToOrFromContainerRule(false, releaseIPNet)
if err != nil && !netlinkwrapper.IsNotExistError(err) {
msg := fmt.Sprintf("failed to delete from-container rule: %v", err)
log.Error(ctx, msg)
return errors.New(msg)
}
log.Infof(ctx, "delete to/from ip rule for pod (%v %v) successfully", client.namespace, client.name)
return nil
}
func getENIInterfaceIndex(linkPrefix string, intf netlink.Link) (int, error) {
eniNameMatcher := regexp.MustCompile(fmt.Sprintf("%s(\\d+)", linkPrefix))
matches := eniNameMatcher.FindStringSubmatch(intf.Attrs().Name)
if len(matches) != 2 {
return -1, fmt.Errorf("invalid interface name: %v", intf.Attrs().Name)
}
index, err := strconv.ParseInt(matches[1], 10, 32)
if err != nil {
return -1, fmt.Errorf("error parsing interface link index: %v", err)
}
return int(index), nil
}
func (client *bccENIMultiIP) delScopeLinkRoute(intf netlink.Link) error {
addrs, err := client.netlink.AddrList(intf, netlink.FAMILY_V4)
if err != nil {
return err
}
for _, addr := range addrs {
dst := net.IPNet{
IP: addr.IP.Mask(addr.Mask),
Mask: addr.Mask,
}
err = client.netlink.RouteDel(&netlink.Route{
Dst: &dst,
Scope: netlink.SCOPE_LINK,
LinkIndex: intf.Attrs().Index,
})
if err != nil && !netlinkwrapper.IsNotExistError(err) {
return err
}
}
return nil
}
func (client *bccENIMultiIP) addToOrFromContainerRule(isToContainer bool, addr *net.IPNet, priority int, rtTable int) error {
rule := netlink.NewRule()
rule.Table = rtTable
rule.Priority = priority
if isToContainer {
rule.Dst = addr // ip rule add from all to `addr` lookup `table` prio `xxx`
} else {
rule.Src = addr // ip rule add from `addr` lookup `table` prio `xxx`
}
err := client.netlink.RuleDel(rule)
if err != nil && !netlinkwrapper.IsNotExistError(err) {
return err
}
if err := client.netlink.RuleAdd(rule); err != nil {
return err
}
return nil
}
func (client *bccENIMultiIP) delToOrFromContainerRule(isToContainer bool, addr *net.IPNet) error {
rule := netlink.NewRule()
if isToContainer {
rule.Dst = addr // ip rule add from all to `addr` lookup `table` prio `xxx`
} else {
rule.Src = addr // ip rule add from `addr` lookup `table` prio `xxx`
}
err := client.netlink.RuleDel(rule)
if err != nil && !netlinkwrapper.IsNotExistError(err) {
return err
}
return nil
}
func (client *bccENIMultiIP) validateEni(eniIntf netlink.Link, rtTable int) error {
if err := client.validateEniRoute(eniIntf, rtTable); err != nil {
return err
}
if err := client.validateEniIP(eniIntf); err != nil {
return err
}
return nil
}
func (client *bccENIMultiIP) validateEniRoute(eniIntf netlink.Link, rtTable int) error {
filter := &netlink.Route{
LinkIndex: eniIntf.Attrs().Index,
Table: rtTable,
}
routes, listErr := client.netlink.RouteListFiltered(netlink.FAMILY_V4, filter,
netlink.RT_FILTER_TABLE|netlink.RT_FILTER_OIF)
if listErr != nil {
return fmt.Errorf("failed to list route of eni %s, linkIndex %d, table %d, err: %s",
eniIntf.Attrs().Name, filter.LinkIndex, filter.Table, listErr)
}
if len(routes) == 0 {
return fmt.Errorf("route table %d of eni %s not found", rtTable, eniIntf.Attrs().Name)
}
return nil
}
func (client *bccENIMultiIP) validateEniIP(eniIntf netlink.Link) error {
eniAddressList, addrErr := client.netlink.AddrList(eniIntf, netlink.FAMILY_V4)
if addrErr != nil {
return fmt.Errorf("failed to list addr of eni %s, err: %s", eniIntf.Attrs().Name, addrErr)
}
if len(eniAddressList) == 0 {
return fmt.Errorf("failed to get address of eni %s", eniIntf.Attrs().Name)
}
return nil
}