wgengine/magicsock: refactor batchingUDPConn to batchingConn interface (#13042)

This commit adds a batchingConn interface, and renames batchingUDPConn
to linuxBatchingConn. tryUpgradeToBatchingConn() may return a platform-
specific implementation of batchingConn. So far only a Linux
implementation of this interface exists, but this refactor is being
done in anticipation of a Windows implementation.

Updates tailscale/corp#21874

Signed-off-by: Jordan Whited <jordan@tailscale.com>
pull/13051/head
Jordan Whited 4 months ago committed by GitHub
parent 7bac5dffcb
commit a93dc6cdb1
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194

@ -4,200 +4,22 @@
package magicsock package magicsock
import ( import (
"errors"
"net"
"net/netip" "net/netip"
"sync"
"sync/atomic"
"syscall"
"time"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6" "golang.org/x/net/ipv6"
"tailscale.com/net/neterror"
"tailscale.com/types/nettype" "tailscale.com/types/nettype"
) )
// xnetBatchReaderWriter defines the batching i/o methods of var (
// golang.org/x/net/ipv4.PacketConn (and ipv6.PacketConn). // This acts as a compile-time check for our usage of ipv6.Message in
// TODO(jwhited): This should eventually be replaced with the standard library // batchingConn for both IPv6 and IPv4 operations.
// implementation of https://github.com/golang/go/issues/45886 _ ipv6.Message = ipv4.Message{}
type xnetBatchReaderWriter interface {
xnetBatchReader
xnetBatchWriter
}
type xnetBatchReader interface {
ReadBatch([]ipv6.Message, int) (int, error)
}
type xnetBatchWriter interface {
WriteBatch([]ipv6.Message, int) (int, error)
}
// batchingUDPConn is a UDP socket that provides batched i/o.
type batchingUDPConn struct {
pc nettype.PacketConn
xpc xnetBatchReaderWriter
rxOffload bool // supports UDP GRO or similar
txOffload atomic.Bool // supports UDP GSO or similar
setGSOSizeInControl func(control *[]byte, gsoSize uint16) // typically setGSOSizeInControl(); swappable for testing
getGSOSizeFromControl func(control []byte) (int, error) // typically getGSOSizeFromControl(); swappable for testing
sendBatchPool sync.Pool
}
func (c *batchingUDPConn) ReadFromUDPAddrPort(p []byte) (n int, addr netip.AddrPort, err error) {
if c.rxOffload {
// UDP_GRO is opt-in on Linux via setsockopt(). Once enabled you may
// receive a "monster datagram" from any read call. The ReadFrom() API
// does not support passing the GSO size and is unsafe to use in such a
// case. Other platforms may vary in behavior, but we go with the most
// conservative approach to prevent this from becoming a footgun in the
// future.
return 0, netip.AddrPort{}, errors.New("rx UDP offload is enabled on this socket, single packet reads are unavailable")
}
return c.pc.ReadFromUDPAddrPort(p)
}
func (c *batchingUDPConn) SetDeadline(t time.Time) error {
return c.pc.SetDeadline(t)
}
func (c *batchingUDPConn) SetReadDeadline(t time.Time) error {
return c.pc.SetReadDeadline(t)
}
func (c *batchingUDPConn) SetWriteDeadline(t time.Time) error {
return c.pc.SetWriteDeadline(t)
}
const (
// This was initially established for Linux, but may split out to
// GOOS-specific values later. It originates as UDP_MAX_SEGMENTS in the
// kernel's TX path, and UDP_GRO_CNT_MAX for RX.
udpSegmentMaxDatagrams = 64
)
const (
// Exceeding these values results in EMSGSIZE.
maxIPv4PayloadLen = 1<<16 - 1 - 20 - 8
maxIPv6PayloadLen = 1<<16 - 1 - 8
) )
// coalesceMessages iterates msgs, coalescing them where possible while // batchingConn is a nettype.PacketConn that provides batched i/o.
// maintaining datagram order. All msgs have their Addr field set to addr. type batchingConn interface {
func (c *batchingUDPConn) coalesceMessages(addr *net.UDPAddr, buffs [][]byte, msgs []ipv6.Message) int { nettype.PacketConn
var ( ReadBatch(msgs []ipv6.Message, flags int) (n int, err error)
base = -1 // index of msg we are currently coalescing into WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error
gsoSize int // segmentation size of msgs[base]
dgramCnt int // number of dgrams coalesced into msgs[base]
endBatch bool // tracking flag to start a new batch on next iteration of buffs
)
maxPayloadLen := maxIPv4PayloadLen
if addr.IP.To4() == nil {
maxPayloadLen = maxIPv6PayloadLen
}
for i, buff := range buffs {
if i > 0 {
msgLen := len(buff)
baseLenBefore := len(msgs[base].Buffers[0])
freeBaseCap := cap(msgs[base].Buffers[0]) - baseLenBefore
if msgLen+baseLenBefore <= maxPayloadLen &&
msgLen <= gsoSize &&
msgLen <= freeBaseCap &&
dgramCnt < udpSegmentMaxDatagrams &&
!endBatch {
msgs[base].Buffers[0] = append(msgs[base].Buffers[0], make([]byte, msgLen)...)
copy(msgs[base].Buffers[0][baseLenBefore:], buff)
if i == len(buffs)-1 {
c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
}
dgramCnt++
if msgLen < gsoSize {
// A smaller than gsoSize packet on the tail is legal, but
// it must end the batch.
endBatch = true
}
continue
}
}
if dgramCnt > 1 {
c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
}
// Reset prior to incrementing base since we are preparing to start a
// new potential batch.
endBatch = false
base++
gsoSize = len(buff)
msgs[base].OOB = msgs[base].OOB[:0]
msgs[base].Buffers[0] = buff
msgs[base].Addr = addr
dgramCnt = 1
}
return base + 1
}
type sendBatch struct {
msgs []ipv6.Message
ua *net.UDPAddr
}
func (c *batchingUDPConn) getSendBatch() *sendBatch {
batch := c.sendBatchPool.Get().(*sendBatch)
return batch
}
func (c *batchingUDPConn) putSendBatch(batch *sendBatch) {
for i := range batch.msgs {
batch.msgs[i] = ipv6.Message{Buffers: batch.msgs[i].Buffers, OOB: batch.msgs[i].OOB}
}
c.sendBatchPool.Put(batch)
}
func (c *batchingUDPConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error {
batch := c.getSendBatch()
defer c.putSendBatch(batch)
if addr.Addr().Is6() {
as16 := addr.Addr().As16()
copy(batch.ua.IP, as16[:])
batch.ua.IP = batch.ua.IP[:16]
} else {
as4 := addr.Addr().As4()
copy(batch.ua.IP, as4[:])
batch.ua.IP = batch.ua.IP[:4]
}
batch.ua.Port = int(addr.Port())
var (
n int
retried bool
)
retry:
if c.txOffload.Load() {
n = c.coalesceMessages(batch.ua, buffs, batch.msgs)
} else {
for i := range buffs {
batch.msgs[i].Buffers[0] = buffs[i]
batch.msgs[i].Addr = batch.ua
batch.msgs[i].OOB = batch.msgs[i].OOB[:0]
}
n = len(buffs)
}
err := c.writeBatch(batch.msgs[:n])
if err != nil && c.txOffload.Load() && neterror.ShouldDisableUDPGSO(err) {
c.txOffload.Store(false)
retried = true
goto retry
}
if retried {
return neterror.ErrUDPGSODisabled{OnLaddr: c.pc.LocalAddr().String(), RetryErr: err}
}
return err
}
func (c *batchingUDPConn) SyscallConn() (syscall.RawConn, error) {
sc, ok := c.pc.(syscall.Conn)
if !ok {
return nil, errUnsupportedConnType
}
return sc.SyscallConn()
} }

@ -0,0 +1,14 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !linux
package magicsock
import (
"tailscale.com/types/nettype"
)
func tryUpgradeToBatchingConn(pconn nettype.PacketConn, _ string, _ int) nettype.PacketConn {
return pconn
}

@ -0,0 +1,419 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package magicsock
import (
"encoding/binary"
"errors"
"fmt"
"net"
"net/netip"
"strings"
"sync"
"sync/atomic"
"syscall"
"time"
"unsafe"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"golang.org/x/sys/unix"
"tailscale.com/hostinfo"
"tailscale.com/net/neterror"
"tailscale.com/types/nettype"
)
// xnetBatchReaderWriter defines the batching i/o methods of
// golang.org/x/net/ipv4.PacketConn (and ipv6.PacketConn).
// TODO(jwhited): This should eventually be replaced with the standard library
// implementation of https://github.com/golang/go/issues/45886
type xnetBatchReaderWriter interface {
xnetBatchReader
xnetBatchWriter
}
type xnetBatchReader interface {
ReadBatch([]ipv6.Message, int) (int, error)
}
type xnetBatchWriter interface {
WriteBatch([]ipv6.Message, int) (int, error)
}
// linuxBatchingConn is a UDP socket that provides batched i/o. It implements
// batchingConn.
type linuxBatchingConn struct {
pc nettype.PacketConn
xpc xnetBatchReaderWriter
rxOffload bool // supports UDP GRO or similar
txOffload atomic.Bool // supports UDP GSO or similar
setGSOSizeInControl func(control *[]byte, gsoSize uint16) // typically setGSOSizeInControl(); swappable for testing
getGSOSizeFromControl func(control []byte) (int, error) // typically getGSOSizeFromControl(); swappable for testing
sendBatchPool sync.Pool
}
func (c *linuxBatchingConn) ReadFromUDPAddrPort(p []byte) (n int, addr netip.AddrPort, err error) {
if c.rxOffload {
// UDP_GRO is opt-in on Linux via setsockopt(). Once enabled you may
// receive a "monster datagram" from any read call. The ReadFrom() API
// does not support passing the GSO size and is unsafe to use in such a
// case. Other platforms may vary in behavior, but we go with the most
// conservative approach to prevent this from becoming a footgun in the
// future.
return 0, netip.AddrPort{}, errors.New("rx UDP offload is enabled on this socket, single packet reads are unavailable")
}
return c.pc.ReadFromUDPAddrPort(p)
}
func (c *linuxBatchingConn) SetDeadline(t time.Time) error {
return c.pc.SetDeadline(t)
}
func (c *linuxBatchingConn) SetReadDeadline(t time.Time) error {
return c.pc.SetReadDeadline(t)
}
func (c *linuxBatchingConn) SetWriteDeadline(t time.Time) error {
return c.pc.SetWriteDeadline(t)
}
const (
// This was initially established for Linux, but may split out to
// GOOS-specific values later. It originates as UDP_MAX_SEGMENTS in the
// kernel's TX path, and UDP_GRO_CNT_MAX for RX.
udpSegmentMaxDatagrams = 64
)
const (
// Exceeding these values results in EMSGSIZE.
maxIPv4PayloadLen = 1<<16 - 1 - 20 - 8
maxIPv6PayloadLen = 1<<16 - 1 - 8
)
// coalesceMessages iterates msgs, coalescing them where possible while
// maintaining datagram order. All msgs have their Addr field set to addr.
func (c *linuxBatchingConn) coalesceMessages(addr *net.UDPAddr, buffs [][]byte, msgs []ipv6.Message) int {
var (
base = -1 // index of msg we are currently coalescing into
gsoSize int // segmentation size of msgs[base]
dgramCnt int // number of dgrams coalesced into msgs[base]
endBatch bool // tracking flag to start a new batch on next iteration of buffs
)
maxPayloadLen := maxIPv4PayloadLen
if addr.IP.To4() == nil {
maxPayloadLen = maxIPv6PayloadLen
}
for i, buff := range buffs {
if i > 0 {
msgLen := len(buff)
baseLenBefore := len(msgs[base].Buffers[0])
freeBaseCap := cap(msgs[base].Buffers[0]) - baseLenBefore
if msgLen+baseLenBefore <= maxPayloadLen &&
msgLen <= gsoSize &&
msgLen <= freeBaseCap &&
dgramCnt < udpSegmentMaxDatagrams &&
!endBatch {
msgs[base].Buffers[0] = append(msgs[base].Buffers[0], make([]byte, msgLen)...)
copy(msgs[base].Buffers[0][baseLenBefore:], buff)
if i == len(buffs)-1 {
c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
}
dgramCnt++
if msgLen < gsoSize {
// A smaller than gsoSize packet on the tail is legal, but
// it must end the batch.
endBatch = true
}
continue
}
}
if dgramCnt > 1 {
c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
}
// Reset prior to incrementing base since we are preparing to start a
// new potential batch.
endBatch = false
base++
gsoSize = len(buff)
msgs[base].OOB = msgs[base].OOB[:0]
msgs[base].Buffers[0] = buff
msgs[base].Addr = addr
dgramCnt = 1
}
return base + 1
}
type sendBatch struct {
msgs []ipv6.Message
ua *net.UDPAddr
}
func (c *linuxBatchingConn) getSendBatch() *sendBatch {
batch := c.sendBatchPool.Get().(*sendBatch)
return batch
}
func (c *linuxBatchingConn) putSendBatch(batch *sendBatch) {
for i := range batch.msgs {
batch.msgs[i] = ipv6.Message{Buffers: batch.msgs[i].Buffers, OOB: batch.msgs[i].OOB}
}
c.sendBatchPool.Put(batch)
}
func (c *linuxBatchingConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error {
batch := c.getSendBatch()
defer c.putSendBatch(batch)
if addr.Addr().Is6() {
as16 := addr.Addr().As16()
copy(batch.ua.IP, as16[:])
batch.ua.IP = batch.ua.IP[:16]
} else {
as4 := addr.Addr().As4()
copy(batch.ua.IP, as4[:])
batch.ua.IP = batch.ua.IP[:4]
}
batch.ua.Port = int(addr.Port())
var (
n int
retried bool
)
retry:
if c.txOffload.Load() {
n = c.coalesceMessages(batch.ua, buffs, batch.msgs)
} else {
for i := range buffs {
batch.msgs[i].Buffers[0] = buffs[i]
batch.msgs[i].Addr = batch.ua
batch.msgs[i].OOB = batch.msgs[i].OOB[:0]
}
n = len(buffs)
}
err := c.writeBatch(batch.msgs[:n])
if err != nil && c.txOffload.Load() && neterror.ShouldDisableUDPGSO(err) {
c.txOffload.Store(false)
retried = true
goto retry
}
if retried {
return neterror.ErrUDPGSODisabled{OnLaddr: c.pc.LocalAddr().String(), RetryErr: err}
}
return err
}
func (c *linuxBatchingConn) SyscallConn() (syscall.RawConn, error) {
sc, ok := c.pc.(syscall.Conn)
if !ok {
return nil, errUnsupportedConnType
}
return sc.SyscallConn()
}
func (c *linuxBatchingConn) writeBatch(msgs []ipv6.Message) error {
var head int
for {
n, err := c.xpc.WriteBatch(msgs[head:], 0)
if err != nil || n == len(msgs[head:]) {
// Returning the number of packets written would require
// unraveling individual msg len and gso size during a coalesced
// write. The top of the call stack disregards partial success,
// so keep this simple for now.
return err
}
head += n
}
}
// splitCoalescedMessages splits coalesced messages from the tail of dst
// beginning at index 'firstMsgAt' into the head of the same slice. It reports
// the number of elements to evaluate in msgs for nonzero len (msgs[i].N). An
// error is returned if a socket control message cannot be parsed or a split
// operation would overflow msgs.
func (c *linuxBatchingConn) splitCoalescedMessages(msgs []ipv6.Message, firstMsgAt int) (n int, err error) {
for i := firstMsgAt; i < len(msgs); i++ {
msg := &msgs[i]
if msg.N == 0 {
return n, err
}
var (
gsoSize int
start int
end = msg.N
numToSplit = 1
)
gsoSize, err = c.getGSOSizeFromControl(msg.OOB[:msg.NN])
if err != nil {
return n, err
}
if gsoSize > 0 {
numToSplit = (msg.N + gsoSize - 1) / gsoSize
end = gsoSize
}
for j := 0; j < numToSplit; j++ {
if n > i {
return n, errors.New("splitting coalesced packet resulted in overflow")
}
copied := copy(msgs[n].Buffers[0], msg.Buffers[0][start:end])
msgs[n].N = copied
msgs[n].Addr = msg.Addr
start = end
end += gsoSize
if end > msg.N {
end = msg.N
}
n++
}
if i != n-1 {
// It is legal for bytes to move within msg.Buffers[0] as a result
// of splitting, so we only zero the source msg len when it is not
// the destination of the last split operation above.
msg.N = 0
}
}
return n, nil
}
func (c *linuxBatchingConn) ReadBatch(msgs []ipv6.Message, flags int) (n int, err error) {
if !c.rxOffload || len(msgs) < 2 {
return c.xpc.ReadBatch(msgs, flags)
}
// Read into the tail of msgs, split into the head.
readAt := len(msgs) - 2
numRead, err := c.xpc.ReadBatch(msgs[readAt:], 0)
if err != nil || numRead == 0 {
return 0, err
}
return c.splitCoalescedMessages(msgs, readAt)
}
func (c *linuxBatchingConn) LocalAddr() net.Addr {
return c.pc.LocalAddr().(*net.UDPAddr)
}
func (c *linuxBatchingConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
return c.pc.WriteToUDPAddrPort(b, addr)
}
func (c *linuxBatchingConn) Close() error {
return c.pc.Close()
}
// tryEnableUDPOffload attempts to enable the UDP_GRO socket option on pconn,
// and returns two booleans indicating TX and RX UDP offload support.
func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
if c, ok := pconn.(*net.UDPConn); ok {
rc, err := c.SyscallConn()
if err != nil {
return
}
err = rc.Control(func(fd uintptr) {
_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
hasTX = errSyscall == nil
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
hasRX = errSyscall == nil
})
if err != nil {
return false, false
}
}
return hasTX, hasRX
}
// getGSOSizeFromControl returns the GSO size found in control. If no GSO size
// is found or the len(control) < unix.SizeofCmsghdr, this function returns 0.
// A non-nil error will be returned if len(control) > unix.SizeofCmsghdr but
// its contents cannot be parsed as a socket control message.
func getGSOSizeFromControl(control []byte) (int, error) {
var (
hdr unix.Cmsghdr
data []byte
rem = control
err error
)
for len(rem) > unix.SizeofCmsghdr {
hdr, data, rem, err = unix.ParseOneSocketControlMessage(control)
if err != nil {
return 0, fmt.Errorf("error parsing socket control message: %w", err)
}
if hdr.Level == unix.SOL_UDP && hdr.Type == unix.UDP_GRO && len(data) >= 2 {
return int(binary.NativeEndian.Uint16(data[:2])), nil
}
}
return 0, nil
}
// setGSOSizeInControl sets a socket control message in control containing
// gsoSize. If len(control) < controlMessageSize control's len will be set to 0.
func setGSOSizeInControl(control *[]byte, gsoSize uint16) {
*control = (*control)[:0]
if cap(*control) < int(unsafe.Sizeof(unix.Cmsghdr{})) {
return
}
if cap(*control) < controlMessageSize {
return
}
*control = (*control)[:cap(*control)]
hdr := (*unix.Cmsghdr)(unsafe.Pointer(&(*control)[0]))
hdr.Level = unix.SOL_UDP
hdr.Type = unix.UDP_SEGMENT
hdr.SetLen(unix.CmsgLen(2))
binary.NativeEndian.PutUint16((*control)[unix.SizeofCmsghdr:], gsoSize)
*control = (*control)[:unix.CmsgSpace(2)]
}
// tryUpgradeToBatchingConn probes the capabilities of the OS and pconn, and
// upgrades pconn to a *linuxBatchingConn if appropriate.
func tryUpgradeToBatchingConn(pconn nettype.PacketConn, network string, batchSize int) nettype.PacketConn {
if network != "udp4" && network != "udp6" {
return pconn
}
if strings.HasPrefix(hostinfo.GetOSVersion(), "2.") {
// recvmmsg/sendmmsg were added in 2.6.33, but we support down to
// 2.6.32 for old NAS devices. See https://github.com/tailscale/tailscale/issues/6807.
// As a cheap heuristic: if the Linux kernel starts with "2", just
// consider it too old for mmsg. Nobody who cares about performance runs
// such ancient kernels. UDP offload was added much later, so no
// upgrades are available.
return pconn
}
uc, ok := pconn.(*net.UDPConn)
if !ok {
return pconn
}
b := &linuxBatchingConn{
pc: pconn,
getGSOSizeFromControl: getGSOSizeFromControl,
setGSOSizeInControl: setGSOSizeInControl,
sendBatchPool: sync.Pool{
New: func() any {
ua := &net.UDPAddr{
IP: make([]byte, 16),
}
msgs := make([]ipv6.Message, batchSize)
for i := range msgs {
msgs[i].Buffers = make([][]byte, 1)
msgs[i].Addr = ua
msgs[i].OOB = make([]byte, controlMessageSize)
}
return &sendBatch{
ua: ua,
msgs: msgs,
}
},
},
}
switch network {
case "udp4":
b.xpc = ipv4.NewPacketConn(uc)
case "udp6":
b.xpc = ipv6.NewPacketConn(uc)
default:
panic("bogus network")
}
var txOffload bool
txOffload, b.rxOffload = tryEnableUDPOffload(uc)
b.txOffload.Store(txOffload)
return b
}

@ -0,0 +1,244 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package magicsock
import (
"encoding/binary"
"net"
"testing"
"golang.org/x/net/ipv6"
)
func setGSOSize(control *[]byte, gsoSize uint16) {
*control = (*control)[:cap(*control)]
binary.LittleEndian.PutUint16(*control, gsoSize)
}
func getGSOSize(control []byte) (int, error) {
if len(control) < 2 {
return 0, nil
}
return int(binary.LittleEndian.Uint16(control)), nil
}
func Test_linuxBatchingConn_splitCoalescedMessages(t *testing.T) {
c := &linuxBatchingConn{
setGSOSizeInControl: setGSOSize,
getGSOSizeFromControl: getGSOSize,
}
newMsg := func(n, gso int) ipv6.Message {
msg := ipv6.Message{
Buffers: [][]byte{make([]byte, 1024)},
N: n,
OOB: make([]byte, 2),
}
binary.LittleEndian.PutUint16(msg.OOB, uint16(gso))
if gso > 0 {
msg.NN = 2
}
return msg
}
cases := []struct {
name string
msgs []ipv6.Message
firstMsgAt int
wantNumEval int
wantMsgLens []int
wantErr bool
}{
{
name: "second last split last empty",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(3, 1),
newMsg(0, 0),
},
firstMsgAt: 2,
wantNumEval: 3,
wantMsgLens: []int{1, 1, 1, 0},
wantErr: false,
},
{
name: "second last no split last empty",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(0, 0),
},
firstMsgAt: 2,
wantNumEval: 1,
wantMsgLens: []int{1, 0, 0, 0},
wantErr: false,
},
{
name: "second last no split last no split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(1, 0),
},
firstMsgAt: 2,
wantNumEval: 2,
wantMsgLens: []int{1, 1, 0, 0},
wantErr: false,
},
{
name: "second last no split last split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(3, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: false,
},
{
name: "second last split last split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(2, 1),
newMsg(2, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: false,
},
{
name: "second last no split last split overflow",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(4, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: true,
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
got, err := c.splitCoalescedMessages(tt.msgs, 2)
if err != nil && !tt.wantErr {
t.Fatalf("err: %v", err)
}
if got != tt.wantNumEval {
t.Fatalf("got to eval: %d want: %d", got, tt.wantNumEval)
}
for i, msg := range tt.msgs {
if msg.N != tt.wantMsgLens[i] {
t.Fatalf("msg[%d].N: %d want: %d", i, msg.N, tt.wantMsgLens[i])
}
}
})
}
}
func Test_linuxBatchingConn_coalesceMessages(t *testing.T) {
c := &linuxBatchingConn{
setGSOSizeInControl: setGSOSize,
getGSOSizeFromControl: getGSOSize,
}
cases := []struct {
name string
buffs [][]byte
wantLens []int
wantGSO []int
}{
{
name: "one message no coalesce",
buffs: [][]byte{
make([]byte, 1, 1),
},
wantLens: []int{1},
wantGSO: []int{0},
},
{
name: "two messages equal len coalesce",
buffs: [][]byte{
make([]byte, 1, 2),
make([]byte, 1, 1),
},
wantLens: []int{2},
wantGSO: []int{1},
},
{
name: "two messages unequal len coalesce",
buffs: [][]byte{
make([]byte, 2, 3),
make([]byte, 1, 1),
},
wantLens: []int{3},
wantGSO: []int{2},
},
{
name: "three messages second unequal len coalesce",
buffs: [][]byte{
make([]byte, 2, 3),
make([]byte, 1, 1),
make([]byte, 2, 2),
},
wantLens: []int{3, 2},
wantGSO: []int{2, 0},
},
{
name: "three messages limited cap coalesce",
buffs: [][]byte{
make([]byte, 2, 4),
make([]byte, 2, 2),
make([]byte, 2, 2),
},
wantLens: []int{4, 2},
wantGSO: []int{2, 0},
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
addr := &net.UDPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 1,
}
msgs := make([]ipv6.Message, len(tt.buffs))
for i := range msgs {
msgs[i].Buffers = make([][]byte, 1)
msgs[i].OOB = make([]byte, 0, 2)
}
got := c.coalesceMessages(addr, tt.buffs, msgs)
if got != len(tt.wantLens) {
t.Fatalf("got len %d want: %d", got, len(tt.wantLens))
}
for i := range got {
if msgs[i].Addr != addr {
t.Errorf("msgs[%d].Addr != passed addr", i)
}
gotLen := len(msgs[i].Buffers[0])
if gotLen != tt.wantLens[i] {
t.Errorf("len(msgs[%d].Buffers[0]) %d != %d", i, gotLen, tt.wantLens[i])
}
gotGSO, err := getGSOSize(msgs[i].OOB)
if err != nil {
t.Fatalf("msgs[%d] getGSOSize err: %v", i, err)
}
if gotGSO != tt.wantGSO[i] {
t.Errorf("msgs[%d] gsoSize %d != %d", i, gotGSO, tt.wantGSO[i])
}
}
})
}
}

@ -25,7 +25,6 @@ import (
"github.com/tailscale/wireguard-go/conn" "github.com/tailscale/wireguard-go/conn"
"go4.org/mem" "go4.org/mem"
"golang.org/x/net/ipv4"
"golang.org/x/net/ipv6" "golang.org/x/net/ipv6"
"tailscale.com/control/controlknobs" "tailscale.com/control/controlknobs"
@ -1101,12 +1100,6 @@ var errNoUDP = errors.New("no UDP available on platform")
var errUnsupportedConnType = errors.New("unsupported connection type") var errUnsupportedConnType = errors.New("unsupported connection type")
var (
// This acts as a compile-time check for our usage of ipv6.Message in
// batchingUDPConn for both IPv6 and IPv4 operations.
_ ipv6.Message = ipv4.Message{}
)
func (c *Conn) sendUDPBatch(addr netip.AddrPort, buffs [][]byte) (sent bool, err error) { func (c *Conn) sendUDPBatch(addr netip.AddrPort, buffs [][]byte) (sent bool, err error) {
isIPv6 := false isIPv6 := false
switch { switch {
@ -2656,153 +2649,6 @@ func (c *Conn) ParseEndpoint(nodeKeyStr string) (conn.Endpoint, error) {
return ep, nil return ep, nil
} }
func (c *batchingUDPConn) writeBatch(msgs []ipv6.Message) error {
var head int
for {
n, err := c.xpc.WriteBatch(msgs[head:], 0)
if err != nil || n == len(msgs[head:]) {
// Returning the number of packets written would require
// unraveling individual msg len and gso size during a coalesced
// write. The top of the call stack disregards partial success,
// so keep this simple for now.
return err
}
head += n
}
}
// splitCoalescedMessages splits coalesced messages from the tail of dst
// beginning at index 'firstMsgAt' into the head of the same slice. It reports
// the number of elements to evaluate in msgs for nonzero len (msgs[i].N). An
// error is returned if a socket control message cannot be parsed or a split
// operation would overflow msgs.
func (c *batchingUDPConn) splitCoalescedMessages(msgs []ipv6.Message, firstMsgAt int) (n int, err error) {
for i := firstMsgAt; i < len(msgs); i++ {
msg := &msgs[i]
if msg.N == 0 {
return n, err
}
var (
gsoSize int
start int
end = msg.N
numToSplit = 1
)
gsoSize, err = c.getGSOSizeFromControl(msg.OOB[:msg.NN])
if err != nil {
return n, err
}
if gsoSize > 0 {
numToSplit = (msg.N + gsoSize - 1) / gsoSize
end = gsoSize
}
for j := 0; j < numToSplit; j++ {
if n > i {
return n, errors.New("splitting coalesced packet resulted in overflow")
}
copied := copy(msgs[n].Buffers[0], msg.Buffers[0][start:end])
msgs[n].N = copied
msgs[n].Addr = msg.Addr
start = end
end += gsoSize
if end > msg.N {
end = msg.N
}
n++
}
if i != n-1 {
// It is legal for bytes to move within msg.Buffers[0] as a result
// of splitting, so we only zero the source msg len when it is not
// the destination of the last split operation above.
msg.N = 0
}
}
return n, nil
}
func (c *batchingUDPConn) ReadBatch(msgs []ipv6.Message, flags int) (n int, err error) {
if !c.rxOffload || len(msgs) < 2 {
return c.xpc.ReadBatch(msgs, flags)
}
// Read into the tail of msgs, split into the head.
readAt := len(msgs) - 2
numRead, err := c.xpc.ReadBatch(msgs[readAt:], 0)
if err != nil || numRead == 0 {
return 0, err
}
return c.splitCoalescedMessages(msgs, readAt)
}
func (c *batchingUDPConn) LocalAddr() net.Addr {
return c.pc.LocalAddr().(*net.UDPAddr)
}
func (c *batchingUDPConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
return c.pc.WriteToUDPAddrPort(b, addr)
}
func (c *batchingUDPConn) Close() error {
return c.pc.Close()
}
// tryUpgradeToBatchingUDPConn probes the capabilities of the OS and pconn, and
// upgrades pconn to a *batchingUDPConn if appropriate.
func tryUpgradeToBatchingUDPConn(pconn nettype.PacketConn, network string, batchSize int) nettype.PacketConn {
if network != "udp4" && network != "udp6" {
return pconn
}
if runtime.GOOS != "linux" {
return pconn
}
if strings.HasPrefix(hostinfo.GetOSVersion(), "2.") {
// recvmmsg/sendmmsg were added in 2.6.33, but we support down to
// 2.6.32 for old NAS devices. See https://github.com/tailscale/tailscale/issues/6807.
// As a cheap heuristic: if the Linux kernel starts with "2", just
// consider it too old for mmsg. Nobody who cares about performance runs
// such ancient kernels. UDP offload was added much later, so no
// upgrades are available.
return pconn
}
uc, ok := pconn.(*net.UDPConn)
if !ok {
return pconn
}
b := &batchingUDPConn{
pc: pconn,
getGSOSizeFromControl: getGSOSizeFromControl,
setGSOSizeInControl: setGSOSizeInControl,
sendBatchPool: sync.Pool{
New: func() any {
ua := &net.UDPAddr{
IP: make([]byte, 16),
}
msgs := make([]ipv6.Message, batchSize)
for i := range msgs {
msgs[i].Buffers = make([][]byte, 1)
msgs[i].Addr = ua
msgs[i].OOB = make([]byte, controlMessageSize)
}
return &sendBatch{
ua: ua,
msgs: msgs,
}
},
},
}
switch network {
case "udp4":
b.xpc = ipv4.NewPacketConn(uc)
case "udp6":
b.xpc = ipv6.NewPacketConn(uc)
default:
panic("bogus network")
}
var txOffload bool
txOffload, b.rxOffload = tryEnableUDPOffload(uc)
b.txOffload.Store(txOffload)
return b
}
func newBlockForeverConn() *blockForeverConn { func newBlockForeverConn() *blockForeverConn {
c := new(blockForeverConn) c := new(blockForeverConn)
c.cond = sync.NewCond(&c.mu) c.cond = sync.NewCond(&c.mu)

@ -21,16 +21,6 @@ func trySetSocketBuffer(pconn nettype.PacketConn, logf logger.Logf) {
portableTrySetSocketBuffer(pconn, logf) portableTrySetSocketBuffer(pconn, logf)
} }
func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
return false, false
}
func getGSOSizeFromControl(control []byte) (int, error) {
return 0, nil
}
func setGSOSizeInControl(control *[]byte, gso uint16) {}
const ( const (
controlMessageSize = 0 controlMessageSize = 0
) )

@ -318,70 +318,6 @@ func trySetSocketBuffer(pconn nettype.PacketConn, logf logger.Logf) {
} }
} }
// tryEnableUDPOffload attempts to enable the UDP_GRO socket option on pconn,
// and returns two booleans indicating TX and RX UDP offload support.
func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
if c, ok := pconn.(*net.UDPConn); ok {
rc, err := c.SyscallConn()
if err != nil {
return
}
err = rc.Control(func(fd uintptr) {
_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
hasTX = errSyscall == nil
errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
hasRX = errSyscall == nil
})
if err != nil {
return false, false
}
}
return hasTX, hasRX
}
// getGSOSizeFromControl returns the GSO size found in control. If no GSO size
// is found or the len(control) < unix.SizeofCmsghdr, this function returns 0.
// A non-nil error will be returned if len(control) > unix.SizeofCmsghdr but
// its contents cannot be parsed as a socket control message.
func getGSOSizeFromControl(control []byte) (int, error) {
var (
hdr unix.Cmsghdr
data []byte
rem = control
err error
)
for len(rem) > unix.SizeofCmsghdr {
hdr, data, rem, err = unix.ParseOneSocketControlMessage(control)
if err != nil {
return 0, fmt.Errorf("error parsing socket control message: %w", err)
}
if hdr.Level == unix.SOL_UDP && hdr.Type == unix.UDP_GRO && len(data) >= 2 {
return int(binary.NativeEndian.Uint16(data[:2])), nil
}
}
return 0, nil
}
// setGSOSizeInControl sets a socket control message in control containing
// gsoSize. If len(control) < controlMessageSize control's len will be set to 0.
func setGSOSizeInControl(control *[]byte, gsoSize uint16) {
*control = (*control)[:0]
if cap(*control) < int(unsafe.Sizeof(unix.Cmsghdr{})) {
return
}
if cap(*control) < controlMessageSize {
return
}
*control = (*control)[:cap(*control)]
hdr := (*unix.Cmsghdr)(unsafe.Pointer(&(*control)[0]))
hdr.Level = unix.SOL_UDP
hdr.Type = unix.UDP_SEGMENT
hdr.SetLen(unix.CmsgLen(2))
binary.NativeEndian.PutUint16((*control)[unix.SizeofCmsghdr:], gsoSize)
*control = (*control)[:unix.CmsgSpace(2)]
}
var controlMessageSize = -1 // bomb if used for allocation before init var controlMessageSize = -1 // bomb if used for allocation before init
func init() { func init() {

@ -35,7 +35,6 @@ import (
xmaps "golang.org/x/exp/maps" xmaps "golang.org/x/exp/maps"
"golang.org/x/net/icmp" "golang.org/x/net/icmp"
"golang.org/x/net/ipv4" "golang.org/x/net/ipv4"
"golang.org/x/net/ipv6"
"tailscale.com/cmd/testwrapper/flakytest" "tailscale.com/cmd/testwrapper/flakytest"
"tailscale.com/control/controlknobs" "tailscale.com/control/controlknobs"
"tailscale.com/derp" "tailscale.com/derp"
@ -2038,238 +2037,6 @@ func TestBufferedDerpWritesBeforeDrop(t *testing.T) {
t.Logf("bufferedDerpWritesBeforeDrop = %d", vv) t.Logf("bufferedDerpWritesBeforeDrop = %d", vv)
} }
func setGSOSize(control *[]byte, gsoSize uint16) {
*control = (*control)[:cap(*control)]
binary.LittleEndian.PutUint16(*control, gsoSize)
}
func getGSOSize(control []byte) (int, error) {
if len(control) < 2 {
return 0, nil
}
return int(binary.LittleEndian.Uint16(control)), nil
}
func Test_batchingUDPConn_splitCoalescedMessages(t *testing.T) {
c := &batchingUDPConn{
setGSOSizeInControl: setGSOSize,
getGSOSizeFromControl: getGSOSize,
}
newMsg := func(n, gso int) ipv6.Message {
msg := ipv6.Message{
Buffers: [][]byte{make([]byte, 1024)},
N: n,
OOB: make([]byte, 2),
}
binary.LittleEndian.PutUint16(msg.OOB, uint16(gso))
if gso > 0 {
msg.NN = 2
}
return msg
}
cases := []struct {
name string
msgs []ipv6.Message
firstMsgAt int
wantNumEval int
wantMsgLens []int
wantErr bool
}{
{
name: "second last split last empty",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(3, 1),
newMsg(0, 0),
},
firstMsgAt: 2,
wantNumEval: 3,
wantMsgLens: []int{1, 1, 1, 0},
wantErr: false,
},
{
name: "second last no split last empty",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(0, 0),
},
firstMsgAt: 2,
wantNumEval: 1,
wantMsgLens: []int{1, 0, 0, 0},
wantErr: false,
},
{
name: "second last no split last no split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(1, 0),
},
firstMsgAt: 2,
wantNumEval: 2,
wantMsgLens: []int{1, 1, 0, 0},
wantErr: false,
},
{
name: "second last no split last split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(3, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: false,
},
{
name: "second last split last split",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(2, 1),
newMsg(2, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: false,
},
{
name: "second last no split last split overflow",
msgs: []ipv6.Message{
newMsg(0, 0),
newMsg(0, 0),
newMsg(1, 0),
newMsg(4, 1),
},
firstMsgAt: 2,
wantNumEval: 4,
wantMsgLens: []int{1, 1, 1, 1},
wantErr: true,
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
got, err := c.splitCoalescedMessages(tt.msgs, 2)
if err != nil && !tt.wantErr {
t.Fatalf("err: %v", err)
}
if got != tt.wantNumEval {
t.Fatalf("got to eval: %d want: %d", got, tt.wantNumEval)
}
for i, msg := range tt.msgs {
if msg.N != tt.wantMsgLens[i] {
t.Fatalf("msg[%d].N: %d want: %d", i, msg.N, tt.wantMsgLens[i])
}
}
})
}
}
func Test_batchingUDPConn_coalesceMessages(t *testing.T) {
c := &batchingUDPConn{
setGSOSizeInControl: setGSOSize,
getGSOSizeFromControl: getGSOSize,
}
cases := []struct {
name string
buffs [][]byte
wantLens []int
wantGSO []int
}{
{
name: "one message no coalesce",
buffs: [][]byte{
make([]byte, 1, 1),
},
wantLens: []int{1},
wantGSO: []int{0},
},
{
name: "two messages equal len coalesce",
buffs: [][]byte{
make([]byte, 1, 2),
make([]byte, 1, 1),
},
wantLens: []int{2},
wantGSO: []int{1},
},
{
name: "two messages unequal len coalesce",
buffs: [][]byte{
make([]byte, 2, 3),
make([]byte, 1, 1),
},
wantLens: []int{3},
wantGSO: []int{2},
},
{
name: "three messages second unequal len coalesce",
buffs: [][]byte{
make([]byte, 2, 3),
make([]byte, 1, 1),
make([]byte, 2, 2),
},
wantLens: []int{3, 2},
wantGSO: []int{2, 0},
},
{
name: "three messages limited cap coalesce",
buffs: [][]byte{
make([]byte, 2, 4),
make([]byte, 2, 2),
make([]byte, 2, 2),
},
wantLens: []int{4, 2},
wantGSO: []int{2, 0},
},
}
for _, tt := range cases {
t.Run(tt.name, func(t *testing.T) {
addr := &net.UDPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 1,
}
msgs := make([]ipv6.Message, len(tt.buffs))
for i := range msgs {
msgs[i].Buffers = make([][]byte, 1)
msgs[i].OOB = make([]byte, 0, 2)
}
got := c.coalesceMessages(addr, tt.buffs, msgs)
if got != len(tt.wantLens) {
t.Fatalf("got len %d want: %d", got, len(tt.wantLens))
}
for i := range got {
if msgs[i].Addr != addr {
t.Errorf("msgs[%d].Addr != passed addr", i)
}
gotLen := len(msgs[i].Buffers[0])
if gotLen != tt.wantLens[i] {
t.Errorf("len(msgs[%d].Buffers[0]) %d != %d", i, gotLen, tt.wantLens[i])
}
gotGSO, err := getGSOSize(msgs[i].OOB)
if err != nil {
t.Fatalf("msgs[%d] getGSOSize err: %v", i, err)
}
if gotGSO != tt.wantGSO[i] {
t.Errorf("msgs[%d] gsoSize %d != %d", i, gotGSO, tt.wantGSO[i])
}
}
})
}
}
// newWireguard starts up a new wireguard-go device attached to a test tun, and // newWireguard starts up a new wireguard-go device attached to a test tun, and
// returns the device, tun and endpoint port. To add peers call device.IpcSet with UAPI instructions. // returns the device, tun and endpoint port. To add peers call device.IpcSet with UAPI instructions.
func newWireguard(t *testing.T, uapi string, aips []netip.Prefix) (*device.Device, *tuntest.ChannelTUN, uint16) { func newWireguard(t *testing.T, uapi string, aips []netip.Prefix) (*device.Device, *tuntest.ChannelTUN, uint16) {

@ -35,12 +35,12 @@ type RebindingUDPConn struct {
// setConnLocked sets the provided nettype.PacketConn. It should be called only // setConnLocked sets the provided nettype.PacketConn. It should be called only
// after acquiring RebindingUDPConn.mu. It upgrades the provided // after acquiring RebindingUDPConn.mu. It upgrades the provided
// nettype.PacketConn to a *batchingUDPConn when appropriate. This upgrade // nettype.PacketConn to a batchingConn when appropriate. This upgrade is
// is intentionally pushed closest to where read/write ops occur in order to // intentionally pushed closest to where read/write ops occur in order to avoid
// avoid disrupting surrounding code that assumes nettype.PacketConn is a // disrupting surrounding code that assumes nettype.PacketConn is a
// *net.UDPConn. // *net.UDPConn.
func (c *RebindingUDPConn) setConnLocked(p nettype.PacketConn, network string, batchSize int) { func (c *RebindingUDPConn) setConnLocked(p nettype.PacketConn, network string, batchSize int) {
upc := tryUpgradeToBatchingUDPConn(p, network, batchSize) upc := tryUpgradeToBatchingConn(p, network, batchSize)
c.pconn = upc c.pconn = upc
c.pconnAtomic.Store(&upc) c.pconnAtomic.Store(&upc)
c.port = uint16(c.localAddrLocked().Port) c.port = uint16(c.localAddrLocked().Port)
@ -74,7 +74,7 @@ func (c *RebindingUDPConn) ReadFromUDPAddrPort(b []byte) (int, netip.AddrPort, e
func (c *RebindingUDPConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error { func (c *RebindingUDPConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error {
for { for {
pconn := *c.pconnAtomic.Load() pconn := *c.pconnAtomic.Load()
b, ok := pconn.(*batchingUDPConn) b, ok := pconn.(batchingConn)
if !ok { if !ok {
for _, buf := range buffs { for _, buf := range buffs {
_, err := c.writeToUDPAddrPortWithInitPconn(pconn, buf, addr) _, err := c.writeToUDPAddrPortWithInitPconn(pconn, buf, addr)
@ -101,7 +101,7 @@ func (c *RebindingUDPConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) err
func (c *RebindingUDPConn) ReadBatch(msgs []ipv6.Message, flags int) (int, error) { func (c *RebindingUDPConn) ReadBatch(msgs []ipv6.Message, flags int) (int, error) {
for { for {
pconn := *c.pconnAtomic.Load() pconn := *c.pconnAtomic.Load()
b, ok := pconn.(*batchingUDPConn) b, ok := pconn.(batchingConn)
if !ok { if !ok {
n, ap, err := c.readFromWithInitPconn(pconn, msgs[0].Buffers[0]) n, ap, err := c.readFromWithInitPconn(pconn, msgs[0].Buffers[0])
if err == nil { if err == nil {

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