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device.go
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device.go
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//go:build !windows
// +build !windows
// Copyright 2015 flannel authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vxlan
import (
"fmt"
"net"
"syscall"
"github.com/containernetworking/plugins/pkg/utils/sysctl"
"github.com/flannel-io/flannel/pkg/ip"
"github.com/flannel-io/flannel/pkg/mac"
"github.com/vishvananda/netlink"
log "k8s.io/klog/v2"
)
type vxlanDeviceAttrs struct {
vni uint32
name string
MTU int
vtepIndex int
vtepAddr net.IP
vtepPort int
gbp bool
learning bool
}
type vxlanDevice struct {
link *netlink.Vxlan
directRouting bool
}
func newVXLANDevice(devAttrs *vxlanDeviceAttrs) (*vxlanDevice, error) {
hardwareAddr, err := mac.NewHardwareAddr()
if err != nil {
return nil, err
}
link := &netlink.Vxlan{
LinkAttrs: netlink.LinkAttrs{
Name: devAttrs.name,
HardwareAddr: hardwareAddr,
MTU: devAttrs.MTU - 50,
},
VxlanId: int(devAttrs.vni),
VtepDevIndex: devAttrs.vtepIndex,
SrcAddr: devAttrs.vtepAddr,
Port: devAttrs.vtepPort,
Learning: devAttrs.learning,
GBP: devAttrs.gbp,
}
link, err = ensureLink(link)
if err != nil {
return nil, err
}
_, _ = sysctl.Sysctl(fmt.Sprintf("net/ipv6/conf/%s/accept_ra", devAttrs.name), "0")
return &vxlanDevice{
link: link,
}, nil
}
func ensureLink(vxlan *netlink.Vxlan) (*netlink.Vxlan, error) {
err := netlink.LinkAdd(vxlan)
if err == syscall.EEXIST {
// it's ok if the device already exists as long as config is similar
log.V(1).Infof("VXLAN device already exists")
existing, err := netlink.LinkByName(vxlan.Name)
if err != nil {
return nil, err
}
incompat := vxlanLinksIncompat(vxlan, existing)
if incompat == "" {
log.V(1).Infof("Returning existing device")
return existing.(*netlink.Vxlan), nil
}
// delete existing
log.Warningf("%q already exists with incompatible configuration: %v; recreating device", vxlan.Name, incompat)
if err = netlink.LinkDel(existing); err != nil {
return nil, fmt.Errorf("failed to delete interface: %v", err)
}
// create new
if err = netlink.LinkAdd(vxlan); err != nil {
return nil, fmt.Errorf("failed to create vxlan interface: %v", err)
}
} else if err != nil {
return nil, err
}
ifindex := vxlan.Index
link, err := netlink.LinkByIndex(vxlan.Index)
if err != nil {
return nil, fmt.Errorf("can't locate created vxlan device with index %v", ifindex)
}
var ok bool
if vxlan, ok = link.(*netlink.Vxlan); !ok {
return nil, fmt.Errorf("created vxlan device with index %v is not vxlan", ifindex)
}
return vxlan, nil
}
func (dev *vxlanDevice) Configure(ipa ip.IP4Net, flannelnet ip.IP4Net) error {
if err := ip.EnsureV4AddressOnLink(ipa, flannelnet, dev.link); err != nil {
return fmt.Errorf("failed to ensure address of interface %s: %s", dev.link.Attrs().Name, err)
}
if err := netlink.LinkSetUp(dev.link); err != nil {
return fmt.Errorf("failed to set interface %s to UP state: %s", dev.link.Attrs().Name, err)
}
return nil
}
func (dev *vxlanDevice) ConfigureIPv6(ipn ip.IP6Net, flannelnet ip.IP6Net) error {
if err := ip.EnsureV6AddressOnLink(ipn, flannelnet, dev.link); err != nil {
return fmt.Errorf("failed to ensure v6 address of interface %s: %w", dev.link.Attrs().Name, err)
}
if err := netlink.LinkSetUp(dev.link); err != nil {
return fmt.Errorf("failed to set v6 interface %s to UP state: %w", dev.link.Attrs().Name, err)
}
return nil
}
func (dev *vxlanDevice) MACAddr() net.HardwareAddr {
return dev.link.HardwareAddr
}
type neighbor struct {
MAC net.HardwareAddr
IP ip.IP4
IP6 *ip.IP6
}
func (dev *vxlanDevice) AddFDB(n neighbor) error {
log.V(4).Infof("calling AddFDB: %v, %v", n.IP, n.MAC)
return netlink.NeighSet(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Family: syscall.AF_BRIDGE,
Flags: netlink.NTF_SELF,
IP: n.IP.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) AddV6FDB(n neighbor) error {
log.V(4).Infof("calling AddV6FDB: %v, %v", n.IP6, n.MAC)
return netlink.NeighSet(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Family: syscall.AF_BRIDGE,
Flags: netlink.NTF_SELF,
IP: n.IP6.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) DelFDB(n neighbor) error {
log.V(4).Infof("calling DelFDB: %v, %v", n.IP, n.MAC)
return netlink.NeighDel(&netlink.Neigh{
LinkIndex: dev.link.Index,
Family: syscall.AF_BRIDGE,
Flags: netlink.NTF_SELF,
IP: n.IP.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) DelV6FDB(n neighbor) error {
log.V(4).Infof("calling DelV6FDB: %v, %v", n.IP6, n.MAC)
return netlink.NeighDel(&netlink.Neigh{
LinkIndex: dev.link.Index,
Family: syscall.AF_BRIDGE,
Flags: netlink.NTF_SELF,
IP: n.IP6.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) AddARP(n neighbor) error {
log.V(4).Infof("calling AddARP: %v, %v", n.IP, n.MAC)
return netlink.NeighSet(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Type: syscall.RTN_UNICAST,
IP: n.IP.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) AddV6ARP(n neighbor) error {
log.V(4).Infof("calling AddV6ARP: %v, %v", n.IP6, n.MAC)
return netlink.NeighSet(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Type: syscall.RTN_UNICAST,
IP: n.IP6.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) DelARP(n neighbor) error {
log.V(4).Infof("calling DelARP: %v, %v", n.IP, n.MAC)
return netlink.NeighDel(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Type: syscall.RTN_UNICAST,
IP: n.IP.ToIP(),
HardwareAddr: n.MAC,
})
}
func (dev *vxlanDevice) DelV6ARP(n neighbor) error {
log.V(4).Infof("calling DelV6ARP: %v, %v", n.IP6, n.MAC)
return netlink.NeighDel(&netlink.Neigh{
LinkIndex: dev.link.Index,
State: netlink.NUD_PERMANENT,
Type: syscall.RTN_UNICAST,
IP: n.IP6.ToIP(),
HardwareAddr: n.MAC,
})
}
func vxlanLinksIncompat(l1, l2 netlink.Link) string {
if l1.Type() != l2.Type() {
return fmt.Sprintf("link type: %v vs %v", l1.Type(), l2.Type())
}
v1 := l1.(*netlink.Vxlan)
v2 := l2.(*netlink.Vxlan)
if v1.VxlanId != v2.VxlanId {
return fmt.Sprintf("vni: %v vs %v", v1.VxlanId, v2.VxlanId)
}
if v1.VtepDevIndex > 0 && v2.VtepDevIndex > 0 && v1.VtepDevIndex != v2.VtepDevIndex {
return fmt.Sprintf("vtep (external) interface: %v vs %v", v1.VtepDevIndex, v2.VtepDevIndex)
}
if len(v1.SrcAddr) > 0 && len(v2.SrcAddr) > 0 && !v1.SrcAddr.Equal(v2.SrcAddr) {
return fmt.Sprintf("vtep (external) IP: %v vs %v", v1.SrcAddr, v2.SrcAddr)
}
if len(v1.Group) > 0 && len(v2.Group) > 0 && !v1.Group.Equal(v2.Group) {
return fmt.Sprintf("group address: %v vs %v", v1.Group, v2.Group)
}
if v1.L2miss != v2.L2miss {
return fmt.Sprintf("l2miss: %v vs %v", v1.L2miss, v2.L2miss)
}
if v1.Port > 0 && v2.Port > 0 && v1.Port != v2.Port {
return fmt.Sprintf("port: %v vs %v", v1.Port, v2.Port)
}
if v1.GBP != v2.GBP {
return fmt.Sprintf("gbp: %v vs %v", v1.GBP, v2.GBP)
}
return ""
}