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global: buff -> buf 

This always struck me as kind of weird and non-standard.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2023-03-13 17:55:05 +01:00
parent 7d327ed35a
commit 0ad14a89f5
18 changed files with 189 additions and 189 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
conn/bind_std.go
View File

@ -204,11 +204,11 @@ again:
}
func (s *StdNetBind) makeReceiveIPv4(pc *ipv4.PacketConn, conn *net.UDPConn) ReceiveFunc {
return func(buffs [][]byte, sizes []int, eps []Endpoint) (n int, err error) {
return func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) {
msgs := s.ipv4MsgsPool.Get().(*[]ipv4.Message)
defer s.ipv4MsgsPool.Put(msgs)
for i := range buffs {
(*msgs)[i].Buffers[0] = buffs[i]
for i := range bufs {
(*msgs)[i].Buffers[0] = bufs[i]
}
var numMsgs int
if runtime.GOOS == "linux" {
@ -237,11 +237,11 @@ func (s *StdNetBind) makeReceiveIPv4(pc *ipv4.PacketConn, conn *net.UDPConn) Rec
}
func (s *StdNetBind) makeReceiveIPv6(pc *ipv6.PacketConn, conn *net.UDPConn) ReceiveFunc {
return func(buffs [][]byte, sizes []int, eps []Endpoint) (n int, err error) {
return func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) {
msgs := s.ipv4MsgsPool.Get().(*[]ipv6.Message)
defer s.ipv4MsgsPool.Put(msgs)
for i := range buffs {
(*msgs)[i].Buffers[0] = buffs[i]
for i := range bufs {
(*msgs)[i].Buffers[0] = bufs[i]
}
var numMsgs int
if runtime.GOOS == "linux" {
@ -301,7 +301,7 @@ func (s *StdNetBind) Close() error {
return err2
}
func (s *StdNetBind) Send(buffs [][]byte, endpoint Endpoint) error {
func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error {
s.mu.Lock()
blackhole := s.blackhole4
conn := s.ipv4
@ -327,21 +327,21 @@ func (s *StdNetBind) Send(buffs [][]byte, endpoint Endpoint) error {
return syscall.EAFNOSUPPORT
}
if is6 {
return s.send6(conn, pc6, endpoint, buffs)
return s.send6(conn, pc6, endpoint, bufs)
} else {
return s.send4(conn, pc4, endpoint, buffs)
return s.send4(conn, pc4, endpoint, bufs)
}
}
func (s *StdNetBind) send4(conn *net.UDPConn, pc *ipv4.PacketConn, ep Endpoint, buffs [][]byte) error {
func (s *StdNetBind) send4(conn *net.UDPConn, pc *ipv4.PacketConn, ep Endpoint, bufs [][]byte) error {
ua := s.udpAddrPool.Get().(*net.UDPAddr)
as4 := ep.DstIP().As4()
copy(ua.IP, as4[:])
ua.IP = ua.IP[:4]
ua.Port = int(ep.(*StdNetEndpoint).Port())
msgs := s.ipv4MsgsPool.Get().(*[]ipv4.Message)
for i, buff := range buffs {
(*msgs)[i].Buffers[0] = buff
for i, buf := range bufs {
(*msgs)[i].Buffers[0] = buf
(*msgs)[i].Addr = ua
setSrcControl(&(*msgs)[i].OOB, ep.(*StdNetEndpoint))
}
@ -352,15 +352,15 @@ func (s *StdNetBind) send4(conn *net.UDPConn, pc *ipv4.PacketConn, ep Endpoint,
)
if runtime.GOOS == "linux" {
for {
n, err = pc.WriteBatch((*msgs)[start:len(buffs)], 0)
if err != nil || n == len((*msgs)[start:len(buffs)]) {
n, err = pc.WriteBatch((*msgs)[start:len(bufs)], 0)
if err != nil || n == len((*msgs)[start:len(bufs)]) {
break
}
start += n
}
} else {
for i, buff := range buffs {
_, _, err = conn.WriteMsgUDP(buff, (*msgs)[i].OOB, ua)
for i, buf := range bufs {
_, _, err = conn.WriteMsgUDP(buf, (*msgs)[i].OOB, ua)
if err != nil {
break
}
@ -371,15 +371,15 @@ func (s *StdNetBind) send4(conn *net.UDPConn, pc *ipv4.PacketConn, ep Endpoint,
return err
}
func (s *StdNetBind) send6(conn *net.UDPConn, pc *ipv6.PacketConn, ep Endpoint, buffs [][]byte) error {
func (s *StdNetBind) send6(conn *net.UDPConn, pc *ipv6.PacketConn, ep Endpoint, bufs [][]byte) error {
ua := s.udpAddrPool.Get().(*net.UDPAddr)
as16 := ep.DstIP().As16()
copy(ua.IP, as16[:])
ua.IP = ua.IP[:16]
ua.Port = int(ep.(*StdNetEndpoint).Port())
msgs := s.ipv6MsgsPool.Get().(*[]ipv6.Message)
for i, buff := range buffs {
(*msgs)[i].Buffers[0] = buff
for i, buf := range bufs {
(*msgs)[i].Buffers[0] = buf
(*msgs)[i].Addr = ua
setSrcControl(&(*msgs)[i].OOB, ep.(*StdNetEndpoint))
}
@ -390,15 +390,15 @@ func (s *StdNetBind) send6(conn *net.UDPConn, pc *ipv6.PacketConn, ep Endpoint,
)
if runtime.GOOS == "linux" {
for {
n, err = pc.WriteBatch((*msgs)[start:len(buffs)], 0)
if err != nil || n == len((*msgs)[start:len(buffs)]) {
n, err = pc.WriteBatch((*msgs)[start:len(bufs)], 0)
if err != nil || n == len((*msgs)[start:len(bufs)]) {
break
}
start += n
}
} else {
for i, buff := range buffs {
_, _, err = conn.WriteMsgUDP(buff, (*msgs)[i].OOB, ua)
for i, buf := range bufs {
_, _, err = conn.WriteMsgUDP(buf, (*msgs)[i].OOB, ua)
if err != nil {
break
}

6
conn/bind_std_test.go
View File

@ -9,14 +9,14 @@ func TestStdNetBindReceiveFuncAfterClose(t *testing.T) {
t.Fatal(err)
}
bind.Close()
buffs := make([][]byte, 1)
buffs[0] = make([]byte, 1)
bufs := make([][]byte, 1)
bufs[0] = make([]byte, 1)
sizes := make([]int, 1)
eps := make([]Endpoint, 1)
for _, fn := range fns {
// The ReceiveFuncs must not access conn-related fields on StdNetBind
// unguarded. Close() nils the conn-related fields resulting in a panic
// if they violate the mutex.
fn(buffs, sizes, eps)
fn(bufs, sizes, eps)
}
}

12
conn/bind_windows.go
View File

@ -416,19 +416,19 @@ retry:
return n, &ep, nil
}
func (bind *WinRingBind) receiveIPv4(buffs [][]byte, sizes []int, eps []Endpoint) (int, error) {
func (bind *WinRingBind) receiveIPv4(bufs [][]byte, sizes []int, eps []Endpoint) (int, error) {
bind.mu.RLock()
defer bind.mu.RUnlock()
n, ep, err := bind.v4.Receive(buffs[0], &bind.isOpen)
n, ep, err := bind.v4.Receive(bufs[0], &bind.isOpen)
sizes[0] = n
eps[0] = ep
return 1, err
}
func (bind *WinRingBind) receiveIPv6(buffs [][]byte, sizes []int, eps []Endpoint) (int, error) {
func (bind *WinRingBind) receiveIPv6(bufs [][]byte, sizes []int, eps []Endpoint) (int, error) {
bind.mu.RLock()
defer bind.mu.RUnlock()
n, ep, err := bind.v6.Receive(buffs[0], &bind.isOpen)
n, ep, err := bind.v6.Receive(bufs[0], &bind.isOpen)
sizes[0] = n
eps[0] = ep
return 1, err
@ -486,14 +486,14 @@ func (bind *afWinRingBind) Send(buf []byte, nend *WinRingEndpoint, isOpen *atomi
return winrio.SendEx(bind.rq, dataBuffer, 1, nil, addressBuffer, nil, nil, 0, 0)
}
func (bind *WinRingBind) Send(buffs [][]byte, endpoint Endpoint) error {
func (bind *WinRingBind) Send(bufs [][]byte, endpoint Endpoint) error {
nend, ok := endpoint.(*WinRingEndpoint)
if !ok {
return ErrWrongEndpointType
}
bind.mu.RLock()
defer bind.mu.RUnlock()
for _, buf := range buffs {
for _, buf := range bufs {
switch nend.family {
case windows.AF_INET:
if bind.v4.blackhole {

8
conn/bindtest/bindtest.go
View File

@ -94,12 +94,12 @@ func (c *ChannelBind) BatchSize() int { return 1 }
func (c *ChannelBind) SetMark(mark uint32) error { return nil }
func (c *ChannelBind) makeReceiveFunc(ch chan []byte) conn.ReceiveFunc {
return func(buffs [][]byte, sizes []int, eps []conn.Endpoint) (n int, err error) {
return func(bufs [][]byte, sizes []int, eps []conn.Endpoint) (n int, err error) {
select {
case <-c.closeSignal:
return 0, net.ErrClosed
case rx := <-ch:
copied := copy(buffs[0], rx)
copied := copy(bufs[0], rx)
sizes[0] = copied
eps[0] = c.target6
return 1, nil
@ -107,8 +107,8 @@ func (c *ChannelBind) makeReceiveFunc(ch chan []byte) conn.ReceiveFunc {
}
}
func (c *ChannelBind) Send(buffs [][]byte, ep conn.Endpoint) error {
for _, b := range buffs {
func (c *ChannelBind) Send(bufs [][]byte, ep conn.Endpoint) error {
for _, b := range bufs {
select {
case <-c.closeSignal:
return net.ErrClosed

6
conn/conn.go
View File

@ -45,9 +45,9 @@ type Bind interface {
// This mark is passed to the kernel as the socket option SO_MARK.
SetMark(mark uint32) error
// Send writes one or more packets in buffs to address ep. The length of
// buffs must not exceed BatchSize().
Send(buffs [][]byte, ep Endpoint) error
// Send writes one or more packets in bufs to address ep. The length of
// bufs must not exceed BatchSize().
Send(bufs [][]byte, ep Endpoint) error
// ParseEndpoint creates a new endpoint from a string.
ParseEndpoint(s string) (Endpoint, error)

2
conn/conn_test.go
View File

@ -11,7 +11,7 @@ import (
func TestPrettyName(t *testing.T) {
var (
recvFunc ReceiveFunc = func(buffs [][]byte, sizes []int, eps []Endpoint) (n int, err error) { return }
recvFunc ReceiveFunc = func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) { return }
)
const want = "TestPrettyName"

10
device/bind_test.go
View File

@ -26,21 +26,21 @@ func (b *DummyBind) SetMark(v uint32) error {
return nil
}
func (b *DummyBind) ReceiveIPv6(buff []byte) (int, conn.Endpoint, error) {
func (b *DummyBind) ReceiveIPv6(buf []byte) (int, conn.Endpoint, error) {
datagram, ok := <-b.in6
if !ok {
return 0, nil, errors.New("closed")
}
copy(buff, datagram.msg)
copy(buf, datagram.msg)
return len(datagram.msg), datagram.endpoint, nil
}
func (b *DummyBind) ReceiveIPv4(buff []byte) (int, conn.Endpoint, error) {
func (b *DummyBind) ReceiveIPv4(buf []byte) (int, conn.Endpoint, error) {
datagram, ok := <-b.in4
if !ok {
return 0, nil, errors.New("closed")
}
copy(buff, datagram.msg)
copy(buf, datagram.msg)
return len(datagram.msg), datagram.endpoint, nil
}
@ -51,6 +51,6 @@ func (b *DummyBind) Close() error {
return nil
}
func (b *DummyBind) Send(buff []byte, end conn.Endpoint) error {
func (b *DummyBind) Send(buf []byte, end conn.Endpoint) error {
return nil
}

16
device/device_test.go
View File

@ -428,7 +428,7 @@ func (b *fakeBindSized) Open(port uint16) (fns []conn.ReceiveFunc, actualPort ui
}
func (b *fakeBindSized) Close() error { return nil }
func (b *fakeBindSized) SetMark(mark uint32) error { return nil }
func (b *fakeBindSized) Send(buffs [][]byte, ep conn.Endpoint) error { return nil }
func (b *fakeBindSized) Send(bufs [][]byte, ep conn.Endpoint) error { return nil }
func (b *fakeBindSized) ParseEndpoint(s string) (conn.Endpoint, error) { return nil, nil }
func (b *fakeBindSized) BatchSize() int { return b.size }
@ -437,15 +437,15 @@ type fakeTUNDeviceSized struct {
}
func (t *fakeTUNDeviceSized) File() *os.File { return nil }
func (t *fakeTUNDeviceSized) Read(buffs [][]byte, sizes []int, offset int) (n int, err error) {
func (t *fakeTUNDeviceSized) Read(bufs [][]byte, sizes []int, offset int) (n int, err error) {
return 0, nil
}
func (t *fakeTUNDeviceSized) Write(buffs [][]byte, offset int) (int, error) { return 0, nil }
func (t *fakeTUNDeviceSized) MTU() (int, error) { return 0, nil }
func (t *fakeTUNDeviceSized) Name() (string, error) { return "", nil }
func (t *fakeTUNDeviceSized) Events() <-chan tun.Event { return nil }
func (t *fakeTUNDeviceSized) Close() error { return nil }
func (t *fakeTUNDeviceSized) BatchSize() int { return t.size }
func (t *fakeTUNDeviceSized) Write(bufs [][]byte, offset int) (int, error) { return 0, nil }
func (t *fakeTUNDeviceSized) MTU() (int, error) { return 0, nil }
func (t *fakeTUNDeviceSized) Name() (string, error) { return "", nil }
func (t *fakeTUNDeviceSized) Events() <-chan tun.Event { return nil }
func (t *fakeTUNDeviceSized) Close() error { return nil }
func (t *fakeTUNDeviceSized) BatchSize() int { return t.size }
func TestBatchSize(t *testing.T) {
d := Device{}

40
device/receive.go
View File

@ -80,8 +80,8 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
// receive datagrams until conn is closed
var (
buffsArrs = make([]*[MaxMessageSize]byte, maxBatchSize)
buffs = make([][]byte, maxBatchSize)
bufsArrs = make([]*[MaxMessageSize]byte, maxBatchSize)
bufs = make([][]byte, maxBatchSize)
err error
sizes = make([]int, maxBatchSize)
count int
@ -90,21 +90,21 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
elemsByPeer = make(map[*Peer]*[]*QueueInboundElement, maxBatchSize)
)
for i := range buffsArrs {
buffsArrs[i] = device.GetMessageBuffer()
buffs[i] = buffsArrs[i][:]
for i := range bufsArrs {
bufsArrs[i] = device.GetMessageBuffer()
bufs[i] = bufsArrs[i][:]
}
defer func() {
for i := 0; i < maxBatchSize; i++ {
if buffsArrs[i] != nil {
device.PutMessageBuffer(buffsArrs[i])
if bufsArrs[i] != nil {
device.PutMessageBuffer(bufsArrs[i])
}
}
}()
for {
count, err = recv(buffs, sizes, endpoints)
count, err = recv(bufs, sizes, endpoints)
if err != nil {
if errors.Is(err, net.ErrClosed) {
return
@ -130,7 +130,7 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
// check size of packet
packet := buffsArrs[i][:size]
packet := bufsArrs[i][:size]
msgType := binary.LittleEndian.Uint32(packet[:4])
switch msgType {
@ -166,7 +166,7 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
peer := value.peer
elem := device.GetInboundElement()
elem.packet = packet
elem.buffer = buffsArrs[i]
elem.buffer = bufsArrs[i]
elem.keypair = keypair
elem.endpoint = endpoints[i]
elem.counter = 0
@ -179,8 +179,8 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
elemsByPeer[peer] = elemsForPeer
}
*elemsForPeer = append(*elemsForPeer, elem)
buffsArrs[i] = device.GetMessageBuffer()
buffs[i] = buffsArrs[i][:]
bufsArrs[i] = device.GetMessageBuffer()
bufs[i] = bufsArrs[i][:]
continue
// otherwise it is a fixed size & handshake related packet
@ -208,12 +208,12 @@ func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.Receive
select {
case device.queue.handshake.c <- QueueHandshakeElement{
msgType: msgType,
buffer: buffsArrs[i],
buffer: bufsArrs[i],
packet: packet,
endpoint: endpoints[i],
}:
buffsArrs[i] = device.GetMessageBuffer()
buffs[i] = buffsArrs[i][:]
bufsArrs[i] = device.GetMessageBuffer()
bufs[i] = bufsArrs[i][:]
default:
}
}
@ -435,7 +435,7 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
}()
device.log.Verbosef("%v - Routine: sequential receiver - started", peer)
buffs := make([][]byte, 0, maxBatchSize)
bufs := make([][]byte, 0, maxBatchSize)
for elems := range peer.queue.inbound.c {
if elems == nil {
@ -507,10 +507,10 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
continue
}
buffs = append(buffs, elem.buffer[:MessageTransportOffsetContent+len(elem.packet)])
bufs = append(bufs, elem.buffer[:MessageTransportOffsetContent+len(elem.packet)])
}
if len(buffs) > 0 {
_, err := device.tun.device.Write(buffs, MessageTransportOffsetContent)
if len(bufs) > 0 {
_, err := device.tun.device.Write(bufs, MessageTransportOffsetContent)
if err != nil && !device.isClosed() {
device.log.Errorf("Failed to write packets to TUN device: %v", err)
}
@ -519,7 +519,7 @@ func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) {
device.PutMessageBuffer(elem.buffer)
device.PutInboundElement(elem)
}
buffs = buffs[:0]
bufs = bufs[:0]
device.PutInboundElementsSlice(elems)
}
}

30
device/send.go
View File

@ -120,8 +120,8 @@ func (peer *Peer) SendHandshakeInitiation(isRetry bool) error {
return err
}
var buff [MessageInitiationSize]byte
writer := bytes.NewBuffer(buff[:0])
var buf [MessageInitiationSize]byte
writer := bytes.NewBuffer(buf[:0])
binary.Write(writer, binary.LittleEndian, msg)
packet := writer.Bytes()
peer.cookieGenerator.AddMacs(packet)
@ -151,8 +151,8 @@ func (peer *Peer) SendHandshakeResponse() error {
return err
}
var buff [MessageResponseSize]byte
writer := bytes.NewBuffer(buff[:0])
var buf [MessageResponseSize]byte
writer := bytes.NewBuffer(buf[:0])
binary.Write(writer, binary.LittleEndian, response)
packet := writer.Bytes()
peer.cookieGenerator.AddMacs(packet)
@ -185,8 +185,8 @@ func (device *Device) SendHandshakeCookie(initiatingElem *QueueHandshakeElement)
return err
}
var buff [MessageCookieReplySize]byte
writer := bytes.NewBuffer(buff[:0])
var buf [MessageCookieReplySize]byte
writer := bytes.NewBuffer(buf[:0])
binary.Write(writer, binary.LittleEndian, reply)
// TODO: allocation could be avoided
device.net.bind.Send([][]byte{writer.Bytes()}, initiatingElem.endpoint)
@ -217,7 +217,7 @@ func (device *Device) RoutineReadFromTUN() {
batchSize = device.BatchSize()
readErr error
elems = make([]*QueueOutboundElement, batchSize)
buffs = make([][]byte, batchSize)
bufs = make([][]byte, batchSize)
elemsByPeer = make(map[*Peer]*[]*QueueOutboundElement, batchSize)
count = 0
sizes = make([]int, batchSize)
@ -226,7 +226,7 @@ func (device *Device) RoutineReadFromTUN() {
for i := range elems {
elems[i] = device.NewOutboundElement()
buffs[i] = elems[i].buffer[:]
bufs[i] = elems[i].buffer[:]
}
defer func() {
@ -240,14 +240,14 @@ func (device *Device) RoutineReadFromTUN() {
for {
// read packets
count, readErr = device.tun.device.Read(buffs, sizes, offset)
count, readErr = device.tun.device.Read(bufs, sizes, offset)
for i := 0; i < count; i++ {
if sizes[i] < 1 {
continue
}
elem := elems[i]
elem.packet = buffs[i][offset : offset+sizes[i]]
elem.packet = bufs[i][offset : offset+sizes[i]]
// lookup peer
var peer *Peer
@ -280,7 +280,7 @@ func (device *Device) RoutineReadFromTUN() {
}
*elemsForPeer = append(*elemsForPeer, elem)
elems[i] = device.NewOutboundElement()
buffs[i] = elems[i].buffer[:]
bufs[i] = elems[i].buffer[:]
}
for peer, elemsForPeer := range elemsByPeer {
@ -483,10 +483,10 @@ func (peer *Peer) RoutineSequentialSender(maxBatchSize int) {
}()
device.log.Verbosef("%v - Routine: sequential sender - started", peer)
buffs := make([][]byte, 0, maxBatchSize)
bufs := make([][]byte, 0, maxBatchSize)
for elems := range peer.queue.outbound.c {
buffs = buffs[:0]
bufs = bufs[:0]
if elems == nil {
return
}
@ -510,13 +510,13 @@ func (peer *Peer) RoutineSequentialSender(maxBatchSize int) {
if len(elem.packet) != MessageKeepaliveSize {
dataSent = true
}
buffs = append(buffs, elem.packet)
bufs = append(bufs, elem.packet)
}
peer.timersAnyAuthenticatedPacketTraversal()
peer.timersAnyAuthenticatedPacketSent()
err := peer.SendBuffers(buffs)
err := peer.SendBuffers(bufs)
if dataSent {
peer.timersDataSent()
}

4
ipc/uapi_linux.go
View File

@ -96,7 +96,7 @@ func UAPIListen(name string, file *os.File) (net.Listener, error) {
}
go func(l *UAPIListener) {
var buff [0]byte
var buf [0]byte
for {
defer uapi.inotifyRWCancel.Close()
// start with lstat to avoid race condition
@ -104,7 +104,7 @@ func UAPIListen(name string, file *os.File) (net.Listener, error) {
l.connErr <- err
return
}
_, err := uapi.inotifyRWCancel.Read(buff[:])
_, err := uapi.inotifyRWCancel.Read(buf[:])
if err != nil {
l.connErr <- err
return

108
tun/tcp_offload_linux.go
View File

@ -95,28 +95,28 @@ func newFlowKey(pkt []byte, srcAddr, dstAddr, tcphOffset int) flowKey {
// lookupOrInsert looks up a flow for the provided packet and metadata,
// returning the packets found for the flow, or inserting a new one if none
// is found.
func (t *tcpGROTable) lookupOrInsert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, buffsIndex int) ([]tcpGROItem, bool) {
func (t *tcpGROTable) lookupOrInsert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex int) ([]tcpGROItem, bool) {
key := newFlowKey(pkt, srcAddrOffset, dstAddrOffset, tcphOffset)
items, ok := t.itemsByFlow[key]
if ok {
return items, ok
}
// TODO: insert() performs another map lookup. This could be rearranged to avoid.
t.insert(pkt, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, buffsIndex)
t.insert(pkt, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex)
return nil, false
}
// insert an item in the table for the provided packet and packet metadata.
func (t *tcpGROTable) insert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, buffsIndex int) {
func (t *tcpGROTable) insert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex int) {
key := newFlowKey(pkt, srcAddrOffset, dstAddrOffset, tcphOffset)
item := tcpGROItem{
key: key,
buffsIndex: uint16(buffsIndex),
gsoSize: uint16(len(pkt[tcphOffset+tcphLen:])),
iphLen: uint8(tcphOffset),
tcphLen: uint8(tcphLen),
sentSeq: binary.BigEndian.Uint32(pkt[tcphOffset+4:]),
pshSet: pkt[tcphOffset+tcpFlagsOffset]&tcpFlagPSH != 0,
key: key,
bufsIndex: uint16(bufsIndex),
gsoSize: uint16(len(pkt[tcphOffset+tcphLen:])),
iphLen: uint8(tcphOffset),
tcphLen: uint8(tcphLen),
sentSeq: binary.BigEndian.Uint32(pkt[tcphOffset+4:]),
pshSet: pkt[tcphOffset+tcpFlagsOffset]&tcpFlagPSH != 0,
}
items, ok := t.itemsByFlow[key]
if !ok {
@ -140,14 +140,14 @@ func (t *tcpGROTable) deleteAt(key flowKey, i int) {
// tcpGROItem represents bookkeeping data for a TCP packet during the lifetime
// of a GRO evaluation across a vector of packets.
type tcpGROItem struct {
key flowKey
sentSeq uint32 // the sequence number
buffsIndex uint16 // the index into the original buffs slice
numMerged uint16 // the number of packets merged into this item
gsoSize uint16 // payload size
iphLen uint8 // ip header len
tcphLen uint8 // tcp header len
pshSet bool // psh flag is set
key flowKey
sentSeq uint32 // the sequence number
bufsIndex uint16 // the index into the original bufs slice
numMerged uint16 // the number of packets merged into this item
gsoSize uint16 // payload size
iphLen uint8 // ip header len
tcphLen uint8 // tcp header len
pshSet bool // psh flag is set
}
func (t *tcpGROTable) newItems() []tcpGROItem {
@ -177,8 +177,8 @@ const (
// tcpPacketsCanCoalesce evaluates if pkt can be coalesced with the packet
// described by item. This function makes considerations that match the kernel's
// GRO self tests, which can be found in tools/testing/selftests/net/gro.c.
func tcpPacketsCanCoalesce(pkt []byte, iphLen, tcphLen uint8, seq uint32, pshSet bool, gsoSize uint16, item tcpGROItem, buffs [][]byte, buffsOffset int) canCoalesce {
pktTarget := buffs[item.buffsIndex][buffsOffset:]
func tcpPacketsCanCoalesce(pkt []byte, iphLen, tcphLen uint8, seq uint32, pshSet bool, gsoSize uint16, item tcpGROItem, bufs [][]byte, bufsOffset int) canCoalesce {
pktTarget := bufs[item.bufsIndex][bufsOffset:]
if tcphLen != item.tcphLen {
// cannot coalesce with unequal tcp options len
return coalesceUnavailable
@ -262,18 +262,18 @@ const (
)
// coalesceTCPPackets attempts to coalesce pkt with the packet described by
// item, returning the outcome. This function may swap buffs elements in the
// event of a prepend as item's buffs index is already being tracked for writing
// item, returning the outcome. This function may swap bufs elements in the
// event of a prepend as item's bufs index is already being tracked for writing
// to a Device.
func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize uint16, seq uint32, pshSet bool, item *tcpGROItem, buffs [][]byte, buffsOffset int, isV6 bool) coalesceResult {
func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize uint16, seq uint32, pshSet bool, item *tcpGROItem, bufs [][]byte, bufsOffset int, isV6 bool) coalesceResult {
var pktHead []byte // the packet that will end up at the front
headersLen := item.iphLen + item.tcphLen
coalescedLen := len(buffs[item.buffsIndex][buffsOffset:]) + len(pkt) - int(headersLen)
coalescedLen := len(bufs[item.bufsIndex][bufsOffset:]) + len(pkt) - int(headersLen)
// Copy data
if mode == coalescePrepend {
pktHead = pkt
if cap(pkt)-buffsOffset < coalescedLen {
if cap(pkt)-bufsOffset < coalescedLen {
// We don't want to allocate a new underlying array if capacity is
// too small.
return coalesceInsufficientCap
@ -282,7 +282,7 @@ func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize
return coalescePSHEnding
}
if item.numMerged == 0 {
if !tcpChecksumValid(buffs[item.buffsIndex][buffsOffset:], item.iphLen, isV6) {
if !tcpChecksumValid(bufs[item.bufsIndex][bufsOffset:], item.iphLen, isV6) {
return coalesceItemInvalidCSum
}
}
@ -291,20 +291,20 @@ func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize
}
item.sentSeq = seq
extendBy := coalescedLen - len(pktHead)
buffs[pktBuffsIndex] = append(buffs[pktBuffsIndex], make([]byte, extendBy)...)
copy(buffs[pktBuffsIndex][buffsOffset+len(pkt):], buffs[item.buffsIndex][buffsOffset+int(headersLen):])
// Flip the slice headers in buffs as part of prepend. The index of item
bufs[pktBuffsIndex] = append(bufs[pktBuffsIndex], make([]byte, extendBy)...)
copy(bufs[pktBuffsIndex][bufsOffset+len(pkt):], bufs[item.bufsIndex][bufsOffset+int(headersLen):])
// Flip the slice headers in bufs as part of prepend. The index of item
// is already being tracked for writing.
buffs[item.buffsIndex], buffs[pktBuffsIndex] = buffs[pktBuffsIndex], buffs[item.buffsIndex]
bufs[item.bufsIndex], bufs[pktBuffsIndex] = bufs[pktBuffsIndex], bufs[item.bufsIndex]
} else {
pktHead = buffs[item.buffsIndex][buffsOffset:]
if cap(pktHead)-buffsOffset < coalescedLen {
pktHead = bufs[item.bufsIndex][bufsOffset:]
if cap(pktHead)-bufsOffset < coalescedLen {
// We don't want to allocate a new underlying array if capacity is
// too small.
return coalesceInsufficientCap
}
if item.numMerged == 0 {
if !tcpChecksumValid(buffs[item.buffsIndex][buffsOffset:], item.iphLen, isV6) {
if !tcpChecksumValid(bufs[item.bufsIndex][bufsOffset:], item.iphLen, isV6) {
return coalesceItemInvalidCSum
}
}
@ -317,8 +317,8 @@ func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize
pktHead[item.iphLen+tcpFlagsOffset] |= tcpFlagPSH
}
extendBy := len(pkt) - int(headersLen)
buffs[item.buffsIndex] = append(buffs[item.buffsIndex], make([]byte, extendBy)...)
copy(buffs[item.buffsIndex][buffsOffset+len(pktHead):], pkt[headersLen:])
bufs[item.bufsIndex] = append(bufs[item.bufsIndex], make([]byte, extendBy)...)
copy(bufs[item.bufsIndex][bufsOffset+len(pktHead):], pkt[headersLen:])
}
if gsoSize > item.gsoSize {
@ -344,7 +344,7 @@ func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize
iphCSum := ^checksum(pktHead[:item.iphLen], 0) // compute checksum
binary.BigEndian.PutUint16(pktHead[10:], iphCSum) // set checksum field
}
hdr.encode(buffs[item.buffsIndex][buffsOffset-virtioNetHdrLen:])
hdr.encode(bufs[item.bufsIndex][bufsOffset-virtioNetHdrLen:])
// Calculate the pseudo header checksum and place it at the TCP checksum
// offset. Downstream checksum offloading will combine this with computation
@ -355,9 +355,9 @@ func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize
addrLen = 16
addrOffset = ipv6SrcAddrOffset
}
srcAddrAt := buffsOffset + addrOffset
srcAddr := buffs[item.buffsIndex][srcAddrAt : srcAddrAt+addrLen]
dstAddr := buffs[item.buffsIndex][srcAddrAt+addrLen : srcAddrAt+addrLen*2]
srcAddrAt := bufsOffset + addrOffset
srcAddr := bufs[item.bufsIndex][srcAddrAt : srcAddrAt+addrLen]
dstAddr := bufs[item.bufsIndex][srcAddrAt+addrLen : srcAddrAt+addrLen*2]
psum := pseudoHeaderChecksumNoFold(unix.IPPROTO_TCP, srcAddr, dstAddr, uint16(coalescedLen-int(item.iphLen)))
binary.BigEndian.PutUint16(pktHead[hdr.csumStart+hdr.csumOffset:], checksum([]byte{}, psum))
@ -375,12 +375,12 @@ const (
maxUint16 = 1<<16 - 1
)
// tcpGRO evaluates the TCP packet at pktI in buffs for coalescing with
// tcpGRO evaluates the TCP packet at pktI in bufs for coalescing with
// existing packets tracked in table. It will return false when pktI is not
// coalesced, otherwise true. This indicates to the caller if buffs[pktI]
// coalesced, otherwise true. This indicates to the caller if bufs[pktI]
// should be written to the Device.
func tcpGRO(buffs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool) (pktCoalesced bool) {
pkt := buffs[pktI][offset:]
func tcpGRO(bufs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool) (pktCoalesced bool) {
pkt := bufs[pktI][offset:]
if len(pkt) > maxUint16 {
// A valid IPv4 or IPv6 packet will never exceed this.
return false
@ -452,9 +452,9 @@ func tcpGRO(buffs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool)
// sequence number perspective, however once an item is inserted into
// the table it is never compared across other items later.
item := items[i]
can := tcpPacketsCanCoalesce(pkt, uint8(iphLen), uint8(tcphLen), seq, pshSet, gsoSize, item, buffs, offset)
can := tcpPacketsCanCoalesce(pkt, uint8(iphLen), uint8(tcphLen), seq, pshSet, gsoSize, item, bufs, offset)
if can != coalesceUnavailable {
result := coalesceTCPPackets(can, pkt, pktI, gsoSize, seq, pshSet, &item, buffs, offset, isV6)
result := coalesceTCPPackets(can, pkt, pktI, gsoSize, seq, pshSet, &item, bufs, offset, isV6)
switch result {
case coalesceSuccess:
table.updateAt(item, i)
@ -500,25 +500,25 @@ func isTCP6NoEH(b []byte) bool {
return true
}
// handleGRO evaluates buffs for GRO, and writes the indices of the resulting
// handleGRO evaluates bufs for GRO, and writes the indices of the resulting
// packets into toWrite. toWrite, tcp4Table, and tcp6Table should initially be
// empty (but non-nil), and are passed in to save allocs as the caller may reset
// and recycle them across vectors of packets.
func handleGRO(buffs [][]byte, offset int, tcp4Table, tcp6Table *tcpGROTable, toWrite *[]int) error {
for i := range buffs {
if offset < virtioNetHdrLen || offset > len(buffs[i])-1 {
func handleGRO(bufs [][]byte, offset int, tcp4Table, tcp6Table *tcpGROTable, toWrite *[]int) error {
for i := range bufs {
if offset < virtioNetHdrLen || offset > len(bufs[i])-1 {
return errors.New("invalid offset")
}
var coalesced bool
switch {
case isTCP4(buffs[i][offset:]):
coalesced = tcpGRO(buffs, offset, i, tcp4Table, false)
case isTCP6NoEH(buffs[i][offset:]): // ipv6 packets w/extension headers do not coalesce
coalesced = tcpGRO(buffs, offset, i, tcp6Table, true)
case isTCP4(bufs[i][offset:]):
coalesced = tcpGRO(bufs, offset, i, tcp4Table, false)
case isTCP6NoEH(bufs[i][offset:]): // ipv6 packets w/extension headers do not coalesce
coalesced = tcpGRO(bufs, offset, i, tcp6Table, true)
}
if !coalesced {
hdr := virtioNetHdr{}
err := hdr.encode(buffs[i][offset-virtioNetHdrLen:])
err := hdr.encode(bufs[i][offset-virtioNetHdrLen:])
if err != nil {
return err
}

10
tun/tun.go
View File

@ -23,16 +23,16 @@ type Device interface {
// Read one or more packets from the Device (without any additional headers).
// On a successful read it returns the number of packets read, and sets
// packet lengths within the sizes slice. len(sizes) must be >= len(buffs).
// packet lengths within the sizes slice. len(sizes) must be >= len(bufs).
// A nonzero offset can be used to instruct the Device on where to begin
// reading into each element of the buffs slice.
Read(buffs [][]byte, sizes []int, offset int) (n int, err error)
// reading into each element of the bufs slice.
Read(bufs [][]byte, sizes []int, offset int) (n int, err error)
// Write one or more packets to the device (without any additional headers).
// On a successful write it returns the number of packets written. A nonzero
// offset can be used to instruct the Device on where to begin writing from
// each packet contained within the buffs slice.
Write(buffs [][]byte, offset int) (int, error)
// each packet contained within the bufs slice.
Write(bufs [][]byte, offset int) (int, error)
// MTU returns the MTU of the Device.
MTU() (int, error)

12
tun/tun_darwin.go
View File

@ -217,7 +217,7 @@ func (tun *NativeTun) Events() <-chan Event {
return tun.events
}
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) {
// TODO: the BSDs look very similar in Read() and Write(). They should be
// collapsed, with platform-specific files containing the varying parts of
// their implementations.
@ -225,8 +225,8 @@ func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error)
case err := <-tun.errors:
return 0, err
default:
buff := buffs[0][offset-4:]
n, err := tun.tunFile.Read(buff[:])
buf := bufs[0][offset-4:]
n, err := tun.tunFile.Read(buf[:])
if n < 4 {
return 0, err
}
@ -235,11 +235,11 @@ func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error)
}
}
func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) {
if offset < 4 {
return 0, io.ErrShortBuffer
}
for i, buf := range buffs {
for i, buf := range bufs {
buf = buf[offset-4:]
buf[0] = 0x00
buf[1] = 0x00
@ -256,7 +256,7 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
return i, err
}
}
return len(buffs), nil
return len(bufs), nil
}
func (tun *NativeTun) Close() error {

12
tun/tun_freebsd.go
View File

@ -333,13 +333,13 @@ func (tun *NativeTun) Events() <-chan Event {
return tun.events
}
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) {
select {
case err := <-tun.errors:
return 0, err
default:
buff := buffs[0][offset-4:]
n, err := tun.tunFile.Read(buff[:])
buf := bufs[0][offset-4:]
n, err := tun.tunFile.Read(buf[:])
if n < 4 {
return 0, err
}
@ -348,11 +348,11 @@ func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error)
}
}
func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) {
if offset < 4 {
return 0, io.ErrShortBuffer
}
for i, buf := range buffs {
for i, buf := range bufs {
buf = buf[offset-4:]
if len(buf) < 5 {
return i, io.ErrShortBuffer
@ -372,7 +372,7 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
return i, err
}
}
return len(buffs), nil
return len(bufs), nil
}
func (tun *NativeTun) Close() error {

30
tun/tun_linux.go
View File

@ -330,7 +330,7 @@ func (tun *NativeTun) nameSlow() (string, error) {
return unix.ByteSliceToString(ifr[:]), nil
}
func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) {
tun.writeOpMu.Lock()
defer func() {
tun.tcp4GROTable.reset()
@ -343,18 +343,18 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
)
tun.toWrite = tun.toWrite[:0]
if tun.vnetHdr {
err := handleGRO(buffs, offset, tun.tcp4GROTable, tun.tcp6GROTable, &tun.toWrite)
err := handleGRO(bufs, offset, tun.tcp4GROTable, tun.tcp6GROTable, &tun.toWrite)
if err != nil {
return 0, err
}
offset -= virtioNetHdrLen
} else {
for i := range buffs {
for i := range bufs {
tun.toWrite = append(tun.toWrite, i)
}
}
for _, buffsI := range tun.toWrite {
n, err := tun.tunFile.Write(buffs[buffsI][offset:])
for _, bufsI := range tun.toWrite {
n, err := tun.tunFile.Write(bufs[bufsI][offset:])
if errors.Is(err, syscall.EBADFD) {
return total, os.ErrClosed
}
@ -367,10 +367,10 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
return total, ErrorBatch(errs)
}
// handleVirtioRead splits in into buffs, leaving offset bytes at the front of
// each buffer. It mutates sizes to reflect the size of each element of buffs,
// handleVirtioRead splits in into bufs, leaving offset bytes at the front of
// each buffer. It mutates sizes to reflect the size of each element of bufs,
// and returns the number of packets read.
func handleVirtioRead(in []byte, buffs [][]byte, sizes []int, offset int) (int, error) {
func handleVirtioRead(in []byte, bufs [][]byte, sizes []int, offset int) (int, error) {
var hdr virtioNetHdr
err := hdr.decode(in)
if err != nil {
@ -387,10 +387,10 @@ func handleVirtioRead(in []byte, buffs [][]byte, sizes []int, offset int) (int,
return 0, err
}
}
if len(in) > len(buffs[0][offset:]) {
return 0, fmt.Errorf("read len %d overflows buffs element len %d", len(in), len(buffs[0][offset:]))
if len(in) > len(bufs[0][offset:]) {
return 0, fmt.Errorf("read len %d overflows bufs element len %d", len(in), len(bufs[0][offset:]))
}
n := copy(buffs[0][offset:], in)
n := copy(bufs[0][offset:], in)
sizes[0] = n
return 1, nil
}
@ -438,17 +438,17 @@ func handleVirtioRead(in []byte, buffs [][]byte, sizes []int, offset int) (int,
return 0, fmt.Errorf("end of checksum offset (%d) exceeds packet length (%d)", cSumAt+1, len(in))
}
return tcpTSO(in, hdr, buffs, sizes, offset)
return tcpTSO(in, hdr, bufs, sizes, offset)
}
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) {
tun.readOpMu.Lock()
defer tun.readOpMu.Unlock()
select {
case err := <-tun.errors:
return 0, err
default:
readInto := buffs[0][offset:]
readInto := bufs[0][offset:]
if tun.vnetHdr {
readInto = tun.readBuff[:]
}
@ -460,7 +460,7 @@ func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error)
return 0, err
}
if tun.vnetHdr {
return handleVirtioRead(readInto[:n], buffs, sizes, offset)
return handleVirtioRead(readInto[:n], bufs, sizes, offset)
} else {
sizes[0] = n
return 1, nil

12
tun/tun_openbsd.go
View File

@ -204,13 +204,13 @@ func (tun *NativeTun) Events() <-chan Event {
return tun.events
}
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) {
select {
case err := <-tun.errors:
return 0, err
default:
buff := buffs[0][offset-4:]
n, err := tun.tunFile.Read(buff[:])
buf := bufs[0][offset-4:]
n, err := tun.tunFile.Read(buf[:])
if n < 4 {
return 0, err
}
@ -219,11 +219,11 @@ func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error)
}
}
func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) {
if offset < 4 {
return 0, io.ErrShortBuffer
}
for i, buf := range buffs {
for i, buf := range bufs {
buf = buf[offset-4:]
buf[0] = 0x00
buf[1] = 0x00
@ -240,7 +240,7 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
return i, err
}
}
return len(buffs), nil
return len(bufs), nil
}
func (tun *NativeTun) Close() error {

14
tun/tun_windows.go
View File

@ -141,7 +141,7 @@ func (tun *NativeTun) BatchSize() int {
// Note: Read() and Write() assume the caller comes only from a single thread; there's no locking.
func (tun *NativeTun) Read(buffs [][]byte, sizes []int, offset int) (int, error) {
func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) {
tun.running.Add(1)
defer tun.running.Done()
retry:
@ -158,7 +158,7 @@ retry:
switch err {
case nil:
packetSize := len(packet)
copy(buffs[0][offset:], packet)
copy(bufs[0][offset:], packet)
sizes[0] = packetSize
tun.session.ReleaseReceivePacket(packet)
tun.rate.update(uint64(packetSize))
@ -179,22 +179,22 @@ retry:
}
}
func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) {
tun.running.Add(1)
defer tun.running.Done()
if tun.close.Load() {
return 0, os.ErrClosed
}
for i, buff := range buffs {
packetSize := len(buff) - offset
for i, buf := range bufs {
packetSize := len(buf) - offset
tun.rate.update(uint64(packetSize))
packet, err := tun.session.AllocateSendPacket(packetSize)
switch err {
case nil:
// TODO: Explore options to eliminate this copy.
copy(packet, buff[offset:])
copy(packet, buf[offset:])
tun.session.SendPacket(packet)
continue
case windows.ERROR_HANDLE_EOF:
@ -205,7 +205,7 @@ func (tun *NativeTun) Write(buffs [][]byte, offset int) (int, error) {
return i, fmt.Errorf("Write failed: %w", err)
}
}
return len(buffs), nil
return len(bufs), nil
}
// LUID returns Windows interface instance ID.