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net_linux.go
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net_linux.go
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// Copyright 2019 Antrea 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.
//go:build linux
// +build linux
package util
import (
"fmt"
"net"
"os"
"os/exec"
"path/filepath"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/vishvananda/netlink"
"k8s.io/klog/v2"
)
// GetNetLink returns dev link from name.
func GetNetLink(dev string) netlink.Link {
link, err := netlink.LinkByName(dev)
if err != nil {
klog.Errorf("Failed to find dev %s: %v", dev, err)
return nil
}
return link
}
// GetNSPeerDevBridge returns peer device and its attached bridge (if applicable)
// for device dev in network space indicated by nsPath
func GetNSPeerDevBridge(nsPath, dev string) (*net.Interface, string, error) {
var peerIdx int
netNS, err := ns.GetNS(nsPath)
if err != nil {
return nil, "", fmt.Errorf("failed to get NS for path %s: %w", nsPath, err)
}
if err := netNS.Do(func(_ ns.NetNS) error {
_, peerIdx, err = ip.GetVethPeerIfindex(dev)
if err != nil {
return fmt.Errorf("failed to get peer idx for dev %s in container %s: %w", dev, nsPath, err)
}
return nil
}); err != nil {
return nil, "", err
}
peerIntf, err := net.InterfaceByIndex(peerIdx)
if err != nil {
return nil, "", fmt.Errorf("failed to get interface for idx %d: %w", peerIdx, err)
}
peerLink, err := netlink.LinkByIndex(peerIdx)
if err != nil {
return nil, "", fmt.Errorf("failed to get link for idx %d: %w", peerIdx, err)
}
// not attached to a bridge.
if peerLink.Attrs().MasterIndex <= 0 {
return peerIntf, "", nil
}
bridgeLink, err := netlink.LinkByIndex(peerLink.Attrs().MasterIndex)
if err != nil {
return nil, "", fmt.Errorf("failed to get master link for dev %s: %w", peerLink.Attrs().Name, err)
}
bridge, ok := bridgeLink.(*netlink.Bridge)
if !ok {
// master link is not bridge
return peerIntf, "", nil
}
return peerIntf, bridge.Name, nil
}
// GetNSDevInterface returns interface of dev in namespace nsPath.
func GetNSDevInterface(nsPath, dev string) (*net.Interface, error) {
netNS, err := ns.GetNS(nsPath)
if err != nil {
return nil, fmt.Errorf("failed to get NS for path %s: %w", nsPath, err)
}
var intf *net.Interface
if err := netNS.Do(func(_ ns.NetNS) error {
intf, err = net.InterfaceByName(dev)
if err != nil {
return fmt.Errorf("failed to get interface %s in container %s: %w", dev, nsPath, err)
}
return nil
}); err != nil {
return nil, err
}
return intf, nil
}
// GetNSPath returns the path of the specified netns.
func GetNSPath(netnsName string) (string, error) {
netNS, err := ns.GetNS(netnsName)
if err != nil {
return "", fmt.Errorf("failed to open netns %s: %v", netnsName, err)
}
defer netNS.Close()
return netNS.Path(), nil
}
func SetLinkUp(name string) (net.HardwareAddr, int, error) {
link, err := netlink.LinkByName(name)
if err != nil {
if _, ok := err.(netlink.LinkNotFoundError); ok {
return nil, 0, newLinkNotFoundError(name)
}
return nil, 0, err
}
// Set host gateway interface up.
if err := netlink.LinkSetUp(link); err != nil {
klog.Errorf("Failed to set host link for %s up: %v", name, err)
return nil, 0, err
}
mac := link.Attrs().HardwareAddr
index := link.Attrs().Index
return mac, index, nil
}
func addrSliceDifference(s1, s2 []netlink.Addr) []*netlink.Addr {
var diff []*netlink.Addr
for i, e1 := range s1 {
found := false
for _, e2 := range s2 {
if e1.Equal(e2) {
found = true
break
}
}
if !found {
diff = append(diff, &s1[i])
}
}
return diff
}
// ConfigureLinkAddresses adds the provided addresses to the interface identified by index idx, if
// they are missing from the interface. Any other existing address already configured for the
// interface will be removed, unless it is a link-local address.
func ConfigureLinkAddresses(idx int, ipNets []*net.IPNet) error {
// No need to check the error here, since the link is found in previous steps.
link, _ := netlink.LinkByIndex(idx)
ifaceName := link.Attrs().Name
var newAddrs []netlink.Addr
for _, ipNet := range ipNets {
newAddrs = append(newAddrs, netlink.Addr{IPNet: ipNet, Label: ""})
}
allAddrs, err := netlink.AddrList(link, netlink.FAMILY_ALL)
if err != nil {
return fmt.Errorf("failed to query address list for interface %s: %v", ifaceName, err)
}
// Remove link-local address from list
addrs := make([]netlink.Addr, 0, len(allAddrs))
for _, addr := range allAddrs {
if !addr.IP.IsLinkLocalUnicast() {
addrs = append(addrs, addr)
}
}
addrsToAdd := addrSliceDifference(newAddrs, addrs)
addrsToRemove := addrSliceDifference(addrs, newAddrs)
if len(addrsToAdd) == 0 && len(addrsToRemove) == 0 {
klog.V(2).Infof("IP configuration for interface %s does not need to change", ifaceName)
return nil
}
for _, addr := range addrsToRemove {
klog.V(2).Infof("Removing address %v from interface %s", addr, ifaceName)
if err := netlink.AddrDel(link, addr); err != nil {
return fmt.Errorf("failed to remove address %v from interface %s: %v", addr, ifaceName, err)
}
}
for _, addr := range addrsToAdd {
klog.V(2).Infof("Adding address %v to interface %s", addr, ifaceName)
if err := netlink.AddrAdd(link, addr); err != nil {
return fmt.Errorf("failed to add address %v to interface %s: %v", addr, ifaceName, err)
}
}
return nil
}
// ListenLocalSocket creates a listener on a Unix domain socket.
func ListenLocalSocket(address string) (net.Listener, error) {
// remove before bind to avoid "address already in use" errors
_ = os.Remove(address)
if err := os.MkdirAll(filepath.Dir(address), 0750); err != nil {
klog.Fatalf("Failed to create directory %s: %v", filepath.Dir(address), err)
}
listener, err := listenUnix(address)
if err != nil {
return nil, err
}
err = os.Chmod(address, 0750)
if err != nil {
klog.Fatalf("Failed to change permissions for socket file %s: %v", address, err)
}
return listener, nil
}
// DialLocalSocket connects to a Unix domain socket.
func DialLocalSocket(address string) (net.Conn, error) {
return dialUnix(address)
}
// SetAdapterMACAddress set specified MAC address on interface.
func SetAdapterMACAddress(adapterName string, macConfig *net.HardwareAddr) error {
link, err := netlink.LinkByName(adapterName)
if err != nil {
return err
}
return netlink.LinkSetHardwareAddr(link, *macConfig)
}
// DeleteOVSPort deletes specific OVS port. This function calls ovs-vsctl command to bypass OVS bridge client to work when agent exiting.
func DeleteOVSPort(brName, portName string) error {
cmd := exec.Command("ovs-vsctl", "--if-exists", "del-port", brName, portName)
return cmd.Run()
}