mirror of
https://github.com/daeuniverse/dae.git
synced 2025-01-03 13:31:00 +07:00
fix: Workaround UDP port conflicts when another local process binds 53 (#414)
This commit is contained in:
/gray
GitHub
parent
f9bba2498e
commit
0f8277b5a4
@ -268,10 +268,11 @@ loop:
|
||||
break loop
|
||||
}
|
||||
}
|
||||
defer os.Remove(PidFilePath)
|
||||
defer control.GetDaeNetns().Close()
|
||||
if e := c.Close(); e != nil {
|
||||
return fmt.Errorf("close control plane: %w", e)
|
||||
}
|
||||
_ = os.Remove(PidFilePath)
|
||||
return nil
|
||||
}
|
||||
|
||||
|
||||
318
control/netns_utils.go
Normal file
318
control/netns_utils.go
Normal file
@ -0,0 +1,318 @@
|
||||
package control
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"net"
|
||||
"os"
|
||||
"path"
|
||||
"runtime"
|
||||
"sync"
|
||||
"sync/atomic"
|
||||
|
||||
"github.com/sirupsen/logrus"
|
||||
"github.com/vishvananda/netlink"
|
||||
"github.com/vishvananda/netns"
|
||||
"golang.org/x/sys/unix"
|
||||
)
|
||||
|
||||
const (
|
||||
NsName = "daens"
|
||||
HostVethName = "dae0"
|
||||
NsVethName = "dae0peer"
|
||||
)
|
||||
|
||||
var (
|
||||
daeNetns *DaeNetns
|
||||
)
|
||||
|
||||
type DaeNetns struct {
|
||||
setupDone atomic.Bool
|
||||
mu sync.Mutex
|
||||
|
||||
dae0, dae0peer netlink.Link
|
||||
hostNs, daeNs netns.NsHandle
|
||||
}
|
||||
|
||||
func init() {
|
||||
daeNetns = &DaeNetns{}
|
||||
}
|
||||
|
||||
func GetDaeNetns() *DaeNetns {
|
||||
return daeNetns
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) Setup() (err error) {
|
||||
if ns.setupDone.Load() {
|
||||
return
|
||||
}
|
||||
|
||||
ns.mu.Lock()
|
||||
defer ns.mu.Unlock()
|
||||
if ns.setupDone.Load() {
|
||||
return
|
||||
}
|
||||
if err = ns.setup(); err != nil {
|
||||
return
|
||||
}
|
||||
ns.setupDone.Store(true)
|
||||
return nil
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) Close() (err error) {
|
||||
DeleteNamedNetns(NsName)
|
||||
DeleteLink(HostVethName)
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) With(f func() error) (err error) {
|
||||
if err = daeNetns.Setup(); err != nil {
|
||||
return fmt.Errorf("failed to setup dae netns: %v", err)
|
||||
}
|
||||
|
||||
runtime.LockOSThread()
|
||||
defer runtime.UnlockOSThread()
|
||||
|
||||
if err = netns.Set(ns.daeNs); err != nil {
|
||||
return fmt.Errorf("failed to switch to daens: %v", err)
|
||||
}
|
||||
defer netns.Set(ns.hostNs)
|
||||
|
||||
if err = f(); err != nil {
|
||||
return fmt.Errorf("failed to run func in dae netns: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setup() (err error) {
|
||||
logrus.Trace("setting up dae netns")
|
||||
|
||||
runtime.LockOSThread()
|
||||
defer runtime.UnlockOSThread()
|
||||
|
||||
if ns.hostNs, err = netns.Get(); err != nil {
|
||||
return fmt.Errorf("failed to get host netns: %v", err)
|
||||
}
|
||||
defer netns.Set(ns.hostNs)
|
||||
|
||||
if err = ns.setupVeth(); err != nil {
|
||||
return
|
||||
}
|
||||
if err = ns.setupSysctl(); err != nil {
|
||||
return
|
||||
}
|
||||
if err = ns.setupNetns(); err != nil {
|
||||
return
|
||||
}
|
||||
if err = ns.setupIPv4Datapath(); err != nil {
|
||||
return
|
||||
}
|
||||
if err = ns.setupIPv6Datapath(); err != nil {
|
||||
return
|
||||
}
|
||||
go ns.monitorDae0LinkAddr()
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setupVeth() (err error) {
|
||||
// ip l a dae0 type veth peer name dae0peer
|
||||
DeleteLink(HostVethName)
|
||||
if err = netlink.LinkAdd(&netlink.Veth{
|
||||
LinkAttrs: netlink.LinkAttrs{
|
||||
Name: HostVethName,
|
||||
},
|
||||
PeerName: NsVethName,
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add veth pair: %v", err)
|
||||
}
|
||||
if ns.dae0, err = netlink.LinkByName(HostVethName); err != nil {
|
||||
return fmt.Errorf("failed to get link dae0: %v", err)
|
||||
}
|
||||
if ns.dae0peer, err = netlink.LinkByName(NsVethName); err != nil {
|
||||
return fmt.Errorf("failed to get link dae0peer: %v", err)
|
||||
}
|
||||
// ip l s dae0 up
|
||||
if err = netlink.LinkSetUp(ns.dae0); err != nil {
|
||||
return fmt.Errorf("failed to set link dae0 up: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setupSysctl() (err error) {
|
||||
// sysctl net.ipv4.conf.dae0.rp_filter=0
|
||||
if err = SetRpFilter(HostVethName, "0"); err != nil {
|
||||
return fmt.Errorf("failed to set rp_filter for dae0: %v", err)
|
||||
}
|
||||
// sysctl net.ipv4.conf.all.rp_filter=0
|
||||
if err = SetRpFilter("all", "0"); err != nil {
|
||||
return fmt.Errorf("failed to set rp_filter for all: %v", err)
|
||||
}
|
||||
// sysctl net.ipv4.conf.dae0.arp_filter=0
|
||||
if err = SetArpFilter(HostVethName, "0"); err != nil {
|
||||
return fmt.Errorf("failed to set arp_filter for dae0: %v", err)
|
||||
}
|
||||
// sysctl net.ipv4.conf.all.arp_filter=0
|
||||
if err = SetArpFilter("all", "0"); err != nil {
|
||||
return fmt.Errorf("failed to set arp_filter for all: %v", err)
|
||||
}
|
||||
// sysctl net.ipv4.conf.dae0.accept_local=1
|
||||
if err = SetAcceptLocal(HostVethName, "1"); err != nil {
|
||||
return fmt.Errorf("failed to set accept_local for dae0: %v", err)
|
||||
}
|
||||
// sysctl net.ipv6.conf.dae0.disable_ipv6=0
|
||||
if err = SetDisableIpv6(HostVethName, "0"); err != nil {
|
||||
return fmt.Errorf("failed to set disable_ipv6 for dae0: %v", err)
|
||||
}
|
||||
// sysctl net.ipv6.conf.dae0.forwarding=1
|
||||
SetForwarding(HostVethName, "1")
|
||||
// sysctl net.ipv6.conf.all.forwarding=1
|
||||
SetForwarding("all", "1")
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setupNetns() (err error) {
|
||||
// ip netns a daens
|
||||
DeleteNamedNetns(NsName)
|
||||
ns.daeNs, err = netns.NewNamed(NsName)
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to create netns: %v", err)
|
||||
}
|
||||
// NewNamed() will switch to the new netns, switch back to host netns
|
||||
if err = netns.Set(ns.hostNs); err != nil {
|
||||
return fmt.Errorf("failed to switch to host netns: %v", err)
|
||||
}
|
||||
// ip l s dae0peer netns daens
|
||||
if err = netlink.LinkSetNsFd(ns.dae0peer, int(ns.daeNs)); err != nil {
|
||||
return fmt.Errorf("failed to move dae0peer to daens: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setupIPv4Datapath() (err error) {
|
||||
if err = netns.Set(ns.daeNs); err != nil {
|
||||
return fmt.Errorf("failed to switch to daens: %v", err)
|
||||
}
|
||||
defer netns.Set(ns.hostNs)
|
||||
|
||||
// (ip net e daens) ip l s dae0peer up
|
||||
if err = netlink.LinkSetUp(ns.dae0peer); err != nil {
|
||||
return fmt.Errorf("failed to set link dae0peer up: %v", err)
|
||||
}
|
||||
// (ip net e daens) ip a a 169.254.0.11 dev dae0peer
|
||||
// Although transparent UDP socket doesn't use this IP, it's still needed to make proper L3 header
|
||||
ip, ipNet, err := net.ParseCIDR("169.254.0.11/32")
|
||||
ipNet.IP = ip
|
||||
if err != nil {
|
||||
return fmt.Errorf("failed to parse ip 169.254.0.11: %v", err)
|
||||
}
|
||||
if err = netlink.AddrAdd(ns.dae0peer, &netlink.Addr{IPNet: ipNet}); err != nil {
|
||||
return fmt.Errorf("failed to add v4 addr to dae0peer: %v", err)
|
||||
}
|
||||
// (ip net e daens) ip r a 169.254.0.1 dev dae0peer
|
||||
// 169.254.0.1 is the link-local address used for ARP caching
|
||||
if err = netlink.RouteAdd(&netlink.Route{
|
||||
LinkIndex: ns.dae0peer.Attrs().Index,
|
||||
Dst: &net.IPNet{IP: net.ParseIP("169.254.0.1"), Mask: net.CIDRMask(32, 32)},
|
||||
Gw: nil,
|
||||
Scope: netlink.SCOPE_LINK,
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add v4 route1 to dae0peer: %v", err)
|
||||
}
|
||||
// (ip net e daens) ip r a default via 169.254.0.1 dev dae0peer
|
||||
if err = netlink.RouteAdd(&netlink.Route{
|
||||
LinkIndex: ns.dae0peer.Attrs().Index,
|
||||
Dst: &net.IPNet{IP: net.IPv4(0, 0, 0, 0), Mask: net.CIDRMask(0, 32)},
|
||||
Gw: net.ParseIP("169.254.0.1"),
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add v4 route2 to dae0peer: %v", err)
|
||||
}
|
||||
// (ip net e daens) ip n r 169.254.0.1 dev dae0peer lladdr $mac_dae0 nud permanent
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) setupIPv6Datapath() (err error) {
|
||||
// ip -6 a a fe80::ecee:eeff:feee:eeee/128 dev dae0 scope link
|
||||
// fe80::ecee:eeff:feee:eeee/128 is the link-local address used for L2 NDP addressing
|
||||
if err = netlink.AddrAdd(ns.dae0, &netlink.Addr{
|
||||
IPNet: &net.IPNet{
|
||||
IP: net.ParseIP("fe80::ecee:eeff:feee:eeee"),
|
||||
Mask: net.CIDRMask(128, 128),
|
||||
},
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add v6 addr to dae0: %v", err)
|
||||
}
|
||||
|
||||
if err = netns.Set(ns.daeNs); err != nil {
|
||||
return fmt.Errorf("failed to switch to daens: %v", err)
|
||||
}
|
||||
defer netns.Set(ns.hostNs)
|
||||
|
||||
// (ip net e daens) ip -6 r a default via fe80::ecee:eeff:feee:eeee dev dae0peer
|
||||
if err = netlink.RouteAdd(&netlink.Route{
|
||||
LinkIndex: ns.dae0peer.Attrs().Index,
|
||||
Dst: &net.IPNet{IP: net.IPv6zero, Mask: net.CIDRMask(0, 128)},
|
||||
Gw: net.ParseIP("fe80::ecee:eeff:feee:eeee"),
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add v6 route to dae0peer: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// updateNeigh() isn't named as setupNeigh() because it requires runtime.LockOSThread()
|
||||
func (ns *DaeNetns) updateNeigh() (err error) {
|
||||
runtime.LockOSThread()
|
||||
defer runtime.UnlockOSThread()
|
||||
|
||||
if err = netns.Set(ns.daeNs); err != nil {
|
||||
return fmt.Errorf("failed to switch to daens: %v", err)
|
||||
}
|
||||
defer netns.Set(ns.hostNs)
|
||||
|
||||
if err = netlink.NeighSet(&netlink.Neigh{
|
||||
IP: net.ParseIP("169.254.0.1"),
|
||||
HardwareAddr: ns.dae0.Attrs().HardwareAddr,
|
||||
LinkIndex: ns.dae0peer.Attrs().Index,
|
||||
State: netlink.NUD_PERMANENT,
|
||||
}); err != nil {
|
||||
return fmt.Errorf("failed to add neigh to dae0peer: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (ns *DaeNetns) monitorDae0LinkAddr() {
|
||||
ch := make(chan netlink.LinkUpdate)
|
||||
done := make(chan struct{})
|
||||
defer close(done)
|
||||
|
||||
err := netlink.LinkSubscribe(ch, done)
|
||||
if err != nil {
|
||||
logrus.Errorf("failed to subscribe link updates: %v", err)
|
||||
}
|
||||
if ns.dae0, err = netlink.LinkByName(HostVethName); err != nil {
|
||||
logrus.Errorf("failed to get link dae0: %v", err)
|
||||
}
|
||||
if err = ns.updateNeigh(); err != nil {
|
||||
logrus.Errorf("failed to update neigh: %v", err)
|
||||
}
|
||||
for msg := range ch {
|
||||
if msg.Link.Attrs().Name == HostVethName && !bytes.Equal(msg.Link.Attrs().HardwareAddr, ns.dae0.Attrs().HardwareAddr) {
|
||||
logrus.WithField("old addr", ns.dae0.Attrs().HardwareAddr).WithField("new addr", msg.Link.Attrs().HardwareAddr).Info("dae0 link addr changed")
|
||||
ns.dae0 = msg.Link
|
||||
ns.updateNeigh()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func DeleteNamedNetns(name string) error {
|
||||
namedPath := path.Join("/run/netns", name)
|
||||
unix.Unmount(namedPath, unix.MNT_DETACH|unix.MNT_FORCE)
|
||||
return os.Remove(namedPath)
|
||||
}
|
||||
|
||||
func DeleteLink(name string) error {
|
||||
link, err := netlink.LinkByName(name)
|
||||
if err == nil {
|
||||
return netlink.LinkDel(link)
|
||||
}
|
||||
return err
|
||||
}
|
||||
@ -90,12 +90,18 @@ func sendPkt(data []byte, from netip.AddrPort, realTo, to netip.AddrPort, lConn
|
||||
}
|
||||
|
||||
uConn, _, err := DefaultAnyfromPool.GetOrCreate(from.String(), AnyfromTimeout)
|
||||
if err != nil {
|
||||
if errors.Is(err, syscall.EADDRINUSE) {
|
||||
// Port collision, use traditional method.
|
||||
return sendPktWithHdrWithFlag(data, from, lConn, to, lanWanFlag)
|
||||
}
|
||||
if err != nil && errors.Is(err, syscall.EADDRINUSE) {
|
||||
logrus.WithField("from", from).
|
||||
WithField("to", to).
|
||||
WithField("realTo", realTo).
|
||||
Trace("Port in use, fallback to use netns.")
|
||||
err = GetDaeNetns().With(func() (err error) {
|
||||
uConn, _, err = DefaultAnyfromPool.GetOrCreate(from.String(), AnyfromTimeout)
|
||||
return err
|
||||
})
|
||||
}
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
_, err = uConn.WriteToUDPAddrPort(data, realTo)
|
||||
return err
|
||||
|
||||
@ -132,6 +132,18 @@ func SetAcceptLocal(ifname, val string) error {
|
||||
return os.WriteFile(fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/accept_local", ifname), []byte(val), 0644)
|
||||
}
|
||||
|
||||
func SetRpFilter(ifname, val string) error {
|
||||
return os.WriteFile(fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/rp_filter", ifname), []byte(val), 0644)
|
||||
}
|
||||
|
||||
func SetArpFilter(ifname, val string) error {
|
||||
return os.WriteFile(fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/arp_filter", ifname), []byte(val), 0644)
|
||||
}
|
||||
|
||||
func SetDisableIpv6(ifname, val string) error {
|
||||
return os.WriteFile(fmt.Sprintf("/proc/sys/net/ipv6/conf/%s/disable_ipv6", ifname), []byte(val), 0644)
|
||||
}
|
||||
|
||||
func checkSendRedirects(ifname string, ipversion consts.IpVersionStr) error {
|
||||
path := fmt.Sprintf("/proc/sys/net/ipv%v/conf/%v/send_redirects", ipversion, ifname)
|
||||
b, err := os.ReadFile(path)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user