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conn,device: provide 8 free bytes at packet head to conn.Bind.Send()

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This enables a conn.Bind to bring its own encapsulating transport, e.g.
VXLAN/Geneve.

Updates tailscale/corp#27502

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2025-05-30 13:14:43 -07:00 • committed by Jordan Whited
parent 022546570f
commit 65cd6eed7d
10 changed files with 58 additions and 39 deletions
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9
conn/bind_std.go
View file

@ -341,7 +341,7 @@ 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
@ -384,7 +384,7 @@ 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
@ -401,7 +401,7 @@ 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)])
@ -450,7 +450,7 @@ 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]
@ -462,6 +462,7 @@ 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])