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Apply Tailscale bind send headroom

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世界 2026-05-17 20:11:01 +08:00
parent 45cd03b8a1
commit 749db0015c
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GPG key ID: CD109927C34A63C4
7 changed files with 50 additions and 32 deletions
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9
conn/bind_std.go
View file

@ -334,7 +334,7 @@ func (e ErrUDPGSODisabled) Unwrap() error {
return e.RetryErr
}
func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error {
func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint, offset int) error {
s.mu.Lock()
blackhole := s.blackhole4
conn := s.ipv4
@ -377,7 +377,7 @@ func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error {
)
retry:
if offload {
n := coalesceMessages(ua, endpoint.(*StdNetEndpoint), bufs, *msgs, setGSOSize)
n := coalesceMessages(ua, endpoint.(*StdNetEndpoint), bufs, offset, *msgs, setGSOSize)
err = s.send(conn, br, (*msgs)[:n])
if err != nil && offload && errShouldDisableUDPGSO(err) {
offload = false
@ -394,7 +394,7 @@ retry:
} else {
for i := range bufs {
(*msgs)[i].Addr = ua
(*msgs)[i].Buffers[0] = bufs[i]
(*msgs)[i].Buffers[0] = bufs[i][offset:]
setSrcControl(&(*msgs)[i].OOB, endpoint.(*StdNetEndpoint))
}
err = s.send(conn, br, (*msgs)[:len(bufs)])
@ -443,7 +443,7 @@ const (
type setGSOFunc func(control *[]byte, gsoSize uint16)
func coalesceMessages(addr *net.UDPAddr, ep *StdNetEndpoint, bufs [][]byte, msgs []ipv6.Message, setGSO setGSOFunc) int {
func coalesceMessages(addr *net.UDPAddr, ep *StdNetEndpoint, bufs [][]byte, offset int, msgs []ipv6.Message, setGSO setGSOFunc) int {
var (
base = -1 // index of msg we are currently coalescing into
gsoSize int // segmentation size of msgs[base]
@ -455,6 +455,7 @@ func coalesceMessages(addr *net.UDPAddr, ep *StdNetEndpoint, bufs [][]byte, msgs
maxPayloadLen = maxIPv6PayloadLen
}
for i, buf := range bufs {
buf = buf[offset:]
if i > 0 {
msgLen := len(buf)
baseLenBefore := len(msgs[base].Buffers[0])

3
conn/bind_windows.go
View file

@ -485,7 +485,7 @@ 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(bufs [][]byte, endpoint Endpoint) error {
func (bind *WinRingBind) Send(bufs [][]byte, endpoint Endpoint, offset int) error {
nend, ok := endpoint.(*WinRingEndpoint)
if !ok {
return ErrWrongEndpointType
@ -493,6 +493,7 @@ func (bind *WinRingBind) Send(bufs [][]byte, endpoint Endpoint) error {
bind.mu.RLock()
defer bind.mu.RUnlock()
for _, buf := range bufs {
buf = buf[offset:]
switch nend.family {
case windows.AF_INET:
if bind.v4.blackhole {

8
conn/conn.go
View file

@ -45,9 +45,11 @@ 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 bufs to address ep. The length of
// bufs must not exceed BatchSize().
Send(bufs [][]byte, ep Endpoint) error
// Send writes one or more packets in bufs to address ep. A nonzero offset
// can be used to instruct the Bind on where packet data begins in each
// element of the bufs slice. Space preceding offset is free to use for
// additional encapsulation. The length of bufs must not exceed BatchSize().
Send(bufs [][]byte, ep Endpoint, offset int) error
// ParseEndpoint creates a new endpoint from a string.
ParseEndpoint(s string) (Endpoint, error)