mirror of https://github.com/tailscale/tailscale/
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
@ -0,0 +1,14 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !linux
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package magicsock
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import (
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"tailscale.com/types/nettype"
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)
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func tryUpgradeToBatchingConn(pconn nettype.PacketConn, _ string, _ int) nettype.PacketConn {
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return pconn
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}
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@ -0,0 +1,419 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package magicsock
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"net"
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"net/netip"
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"strings"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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"unsafe"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"golang.org/x/sys/unix"
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"tailscale.com/hostinfo"
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"tailscale.com/net/neterror"
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"tailscale.com/types/nettype"
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)
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// xnetBatchReaderWriter defines the batching i/o methods of
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// golang.org/x/net/ipv4.PacketConn (and ipv6.PacketConn).
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// TODO(jwhited): This should eventually be replaced with the standard library
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// implementation of https://github.com/golang/go/issues/45886
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type xnetBatchReaderWriter interface {
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xnetBatchReader
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xnetBatchWriter
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}
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type xnetBatchReader interface {
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ReadBatch([]ipv6.Message, int) (int, error)
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}
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type xnetBatchWriter interface {
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WriteBatch([]ipv6.Message, int) (int, error)
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}
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// linuxBatchingConn is a UDP socket that provides batched i/o. It implements
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// batchingConn.
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type linuxBatchingConn struct {
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pc nettype.PacketConn
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xpc xnetBatchReaderWriter
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rxOffload bool // supports UDP GRO or similar
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txOffload atomic.Bool // supports UDP GSO or similar
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setGSOSizeInControl func(control *[]byte, gsoSize uint16) // typically setGSOSizeInControl(); swappable for testing
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getGSOSizeFromControl func(control []byte) (int, error) // typically getGSOSizeFromControl(); swappable for testing
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sendBatchPool sync.Pool
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}
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func (c *linuxBatchingConn) ReadFromUDPAddrPort(p []byte) (n int, addr netip.AddrPort, err error) {
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if c.rxOffload {
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// UDP_GRO is opt-in on Linux via setsockopt(). Once enabled you may
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// receive a "monster datagram" from any read call. The ReadFrom() API
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// does not support passing the GSO size and is unsafe to use in such a
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// case. Other platforms may vary in behavior, but we go with the most
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// conservative approach to prevent this from becoming a footgun in the
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// future.
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return 0, netip.AddrPort{}, errors.New("rx UDP offload is enabled on this socket, single packet reads are unavailable")
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}
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return c.pc.ReadFromUDPAddrPort(p)
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}
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func (c *linuxBatchingConn) SetDeadline(t time.Time) error {
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return c.pc.SetDeadline(t)
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}
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func (c *linuxBatchingConn) SetReadDeadline(t time.Time) error {
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return c.pc.SetReadDeadline(t)
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}
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func (c *linuxBatchingConn) SetWriteDeadline(t time.Time) error {
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return c.pc.SetWriteDeadline(t)
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}
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const (
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// This was initially established for Linux, but may split out to
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// GOOS-specific values later. It originates as UDP_MAX_SEGMENTS in the
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// kernel's TX path, and UDP_GRO_CNT_MAX for RX.
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udpSegmentMaxDatagrams = 64
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)
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const (
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// Exceeding these values results in EMSGSIZE.
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maxIPv4PayloadLen = 1<<16 - 1 - 20 - 8
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maxIPv6PayloadLen = 1<<16 - 1 - 8
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)
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// coalesceMessages iterates msgs, coalescing them where possible while
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// maintaining datagram order. All msgs have their Addr field set to addr.
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func (c *linuxBatchingConn) coalesceMessages(addr *net.UDPAddr, buffs [][]byte, msgs []ipv6.Message) int {
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var (
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base = -1 // index of msg we are currently coalescing into
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gsoSize int // segmentation size of msgs[base]
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dgramCnt int // number of dgrams coalesced into msgs[base]
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endBatch bool // tracking flag to start a new batch on next iteration of buffs
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)
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maxPayloadLen := maxIPv4PayloadLen
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if addr.IP.To4() == nil {
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maxPayloadLen = maxIPv6PayloadLen
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}
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for i, buff := range buffs {
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if i > 0 {
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msgLen := len(buff)
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baseLenBefore := len(msgs[base].Buffers[0])
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freeBaseCap := cap(msgs[base].Buffers[0]) - baseLenBefore
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if msgLen+baseLenBefore <= maxPayloadLen &&
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msgLen <= gsoSize &&
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msgLen <= freeBaseCap &&
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dgramCnt < udpSegmentMaxDatagrams &&
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!endBatch {
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msgs[base].Buffers[0] = append(msgs[base].Buffers[0], make([]byte, msgLen)...)
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copy(msgs[base].Buffers[0][baseLenBefore:], buff)
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if i == len(buffs)-1 {
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c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
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}
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dgramCnt++
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if msgLen < gsoSize {
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// A smaller than gsoSize packet on the tail is legal, but
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// it must end the batch.
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endBatch = true
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}
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continue
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}
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}
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if dgramCnt > 1 {
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c.setGSOSizeInControl(&msgs[base].OOB, uint16(gsoSize))
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}
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// Reset prior to incrementing base since we are preparing to start a
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// new potential batch.
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endBatch = false
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base++
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gsoSize = len(buff)
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msgs[base].OOB = msgs[base].OOB[:0]
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msgs[base].Buffers[0] = buff
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msgs[base].Addr = addr
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dgramCnt = 1
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}
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return base + 1
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}
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type sendBatch struct {
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msgs []ipv6.Message
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ua *net.UDPAddr
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}
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func (c *linuxBatchingConn) getSendBatch() *sendBatch {
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batch := c.sendBatchPool.Get().(*sendBatch)
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return batch
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}
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func (c *linuxBatchingConn) putSendBatch(batch *sendBatch) {
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for i := range batch.msgs {
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batch.msgs[i] = ipv6.Message{Buffers: batch.msgs[i].Buffers, OOB: batch.msgs[i].OOB}
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}
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c.sendBatchPool.Put(batch)
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}
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func (c *linuxBatchingConn) WriteBatchTo(buffs [][]byte, addr netip.AddrPort) error {
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batch := c.getSendBatch()
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defer c.putSendBatch(batch)
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if addr.Addr().Is6() {
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as16 := addr.Addr().As16()
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copy(batch.ua.IP, as16[:])
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batch.ua.IP = batch.ua.IP[:16]
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} else {
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as4 := addr.Addr().As4()
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copy(batch.ua.IP, as4[:])
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batch.ua.IP = batch.ua.IP[:4]
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}
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batch.ua.Port = int(addr.Port())
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var (
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n int
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retried bool
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)
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retry:
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if c.txOffload.Load() {
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n = c.coalesceMessages(batch.ua, buffs, batch.msgs)
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} else {
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for i := range buffs {
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batch.msgs[i].Buffers[0] = buffs[i]
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batch.msgs[i].Addr = batch.ua
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batch.msgs[i].OOB = batch.msgs[i].OOB[:0]
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}
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n = len(buffs)
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}
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err := c.writeBatch(batch.msgs[:n])
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if err != nil && c.txOffload.Load() && neterror.ShouldDisableUDPGSO(err) {
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c.txOffload.Store(false)
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retried = true
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goto retry
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}
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if retried {
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return neterror.ErrUDPGSODisabled{OnLaddr: c.pc.LocalAddr().String(), RetryErr: err}
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}
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return err
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}
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func (c *linuxBatchingConn) SyscallConn() (syscall.RawConn, error) {
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sc, ok := c.pc.(syscall.Conn)
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if !ok {
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return nil, errUnsupportedConnType
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}
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return sc.SyscallConn()
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}
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func (c *linuxBatchingConn) writeBatch(msgs []ipv6.Message) error {
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var head int
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for {
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n, err := c.xpc.WriteBatch(msgs[head:], 0)
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if err != nil || n == len(msgs[head:]) {
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// Returning the number of packets written would require
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// unraveling individual msg len and gso size during a coalesced
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// write. The top of the call stack disregards partial success,
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// so keep this simple for now.
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return err
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}
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head += n
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}
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}
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// splitCoalescedMessages splits coalesced messages from the tail of dst
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// beginning at index 'firstMsgAt' into the head of the same slice. It reports
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// the number of elements to evaluate in msgs for nonzero len (msgs[i].N). An
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// error is returned if a socket control message cannot be parsed or a split
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// operation would overflow msgs.
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func (c *linuxBatchingConn) splitCoalescedMessages(msgs []ipv6.Message, firstMsgAt int) (n int, err error) {
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for i := firstMsgAt; i < len(msgs); i++ {
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msg := &msgs[i]
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if msg.N == 0 {
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return n, err
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}
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var (
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gsoSize int
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start int
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end = msg.N
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numToSplit = 1
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)
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gsoSize, err = c.getGSOSizeFromControl(msg.OOB[:msg.NN])
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if err != nil {
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return n, err
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}
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if gsoSize > 0 {
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numToSplit = (msg.N + gsoSize - 1) / gsoSize
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end = gsoSize
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}
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for j := 0; j < numToSplit; j++ {
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if n > i {
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return n, errors.New("splitting coalesced packet resulted in overflow")
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}
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copied := copy(msgs[n].Buffers[0], msg.Buffers[0][start:end])
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msgs[n].N = copied
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msgs[n].Addr = msg.Addr
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start = end
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end += gsoSize
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if end > msg.N {
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end = msg.N
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}
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n++
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}
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if i != n-1 {
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// It is legal for bytes to move within msg.Buffers[0] as a result
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// of splitting, so we only zero the source msg len when it is not
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// the destination of the last split operation above.
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msg.N = 0
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}
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}
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return n, nil
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}
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func (c *linuxBatchingConn) ReadBatch(msgs []ipv6.Message, flags int) (n int, err error) {
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if !c.rxOffload || len(msgs) < 2 {
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return c.xpc.ReadBatch(msgs, flags)
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}
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// Read into the tail of msgs, split into the head.
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readAt := len(msgs) - 2
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numRead, err := c.xpc.ReadBatch(msgs[readAt:], 0)
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if err != nil || numRead == 0 {
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return 0, err
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}
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return c.splitCoalescedMessages(msgs, readAt)
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}
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func (c *linuxBatchingConn) LocalAddr() net.Addr {
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return c.pc.LocalAddr().(*net.UDPAddr)
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}
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func (c *linuxBatchingConn) WriteToUDPAddrPort(b []byte, addr netip.AddrPort) (int, error) {
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return c.pc.WriteToUDPAddrPort(b, addr)
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}
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func (c *linuxBatchingConn) Close() error {
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return c.pc.Close()
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}
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// tryEnableUDPOffload attempts to enable the UDP_GRO socket option on pconn,
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// and returns two booleans indicating TX and RX UDP offload support.
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func tryEnableUDPOffload(pconn nettype.PacketConn) (hasTX bool, hasRX bool) {
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if c, ok := pconn.(*net.UDPConn); ok {
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rc, err := c.SyscallConn()
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if err != nil {
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return
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}
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err = rc.Control(func(fd uintptr) {
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_, errSyscall := syscall.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
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hasTX = errSyscall == nil
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errSyscall = syscall.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1)
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hasRX = errSyscall == nil
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})
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if err != nil {
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return false, false
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}
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}
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return hasTX, hasRX
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}
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// getGSOSizeFromControl returns the GSO size found in control. If no GSO size
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// is found or the len(control) < unix.SizeofCmsghdr, this function returns 0.
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// A non-nil error will be returned if len(control) > unix.SizeofCmsghdr but
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// its contents cannot be parsed as a socket control message.
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func getGSOSizeFromControl(control []byte) (int, error) {
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var (
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hdr unix.Cmsghdr
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data []byte
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rem = control
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err error
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)
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for len(rem) > unix.SizeofCmsghdr {
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hdr, data, rem, err = unix.ParseOneSocketControlMessage(control)
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if err != nil {
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return 0, fmt.Errorf("error parsing socket control message: %w", err)
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}
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if hdr.Level == unix.SOL_UDP && hdr.Type == unix.UDP_GRO && len(data) >= 2 {
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return int(binary.NativeEndian.Uint16(data[:2])), nil
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}
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}
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return 0, nil
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}
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// setGSOSizeInControl sets a socket control message in control containing
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// gsoSize. If len(control) < controlMessageSize control's len will be set to 0.
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func setGSOSizeInControl(control *[]byte, gsoSize uint16) {
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*control = (*control)[:0]
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if cap(*control) < int(unsafe.Sizeof(unix.Cmsghdr{})) {
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return
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}
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if cap(*control) < controlMessageSize {
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return
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}
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*control = (*control)[:cap(*control)]
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hdr := (*unix.Cmsghdr)(unsafe.Pointer(&(*control)[0]))
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hdr.Level = unix.SOL_UDP
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hdr.Type = unix.UDP_SEGMENT
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hdr.SetLen(unix.CmsgLen(2))
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binary.NativeEndian.PutUint16((*control)[unix.SizeofCmsghdr:], gsoSize)
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*control = (*control)[:unix.CmsgSpace(2)]
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}
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// tryUpgradeToBatchingConn probes the capabilities of the OS and pconn, and
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// upgrades pconn to a *linuxBatchingConn if appropriate.
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func tryUpgradeToBatchingConn(pconn nettype.PacketConn, network string, batchSize int) nettype.PacketConn {
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if network != "udp4" && network != "udp6" {
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return pconn
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}
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if strings.HasPrefix(hostinfo.GetOSVersion(), "2.") {
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// recvmmsg/sendmmsg were added in 2.6.33, but we support down to
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// 2.6.32 for old NAS devices. See https://github.com/tailscale/tailscale/issues/6807.
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// As a cheap heuristic: if the Linux kernel starts with "2", just
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// consider it too old for mmsg. Nobody who cares about performance runs
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// such ancient kernels. UDP offload was added much later, so no
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// upgrades are available.
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return pconn
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}
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uc, ok := pconn.(*net.UDPConn)
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if !ok {
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return pconn
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}
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b := &linuxBatchingConn{
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pc: pconn,
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getGSOSizeFromControl: getGSOSizeFromControl,
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setGSOSizeInControl: setGSOSizeInControl,
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sendBatchPool: sync.Pool{
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New: func() any {
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ua := &net.UDPAddr{
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IP: make([]byte, 16),
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}
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msgs := make([]ipv6.Message, batchSize)
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for i := range msgs {
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msgs[i].Buffers = make([][]byte, 1)
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msgs[i].Addr = ua
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msgs[i].OOB = make([]byte, controlMessageSize)
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}
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return &sendBatch{
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ua: ua,
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msgs: msgs,
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}
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},
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},
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}
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switch network {
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case "udp4":
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b.xpc = ipv4.NewPacketConn(uc)
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case "udp6":
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b.xpc = ipv6.NewPacketConn(uc)
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default:
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panic("bogus network")
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}
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var txOffload bool
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txOffload, b.rxOffload = tryEnableUDPOffload(uc)
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b.txOffload.Store(txOffload)
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return b
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}
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@ -0,0 +1,244 @@
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// Copyright (c) Tailscale Inc & AUTHORS
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||||
// SPDX-License-Identifier: BSD-3-Clause
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|
||||
package magicsock
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import (
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"encoding/binary"
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"net"
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"testing"
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||||
|
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"golang.org/x/net/ipv6"
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)
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func setGSOSize(control *[]byte, gsoSize uint16) {
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*control = (*control)[:cap(*control)]
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binary.LittleEndian.PutUint16(*control, gsoSize)
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}
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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])
|
||||
}
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue