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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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3
conn/bind_windows.go
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@ -486,7 +486,7 @@ 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
@ -494,6 +494,7 @@ 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 {