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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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5
device/peer.go
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@ -113,6 +113,9 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
return peer, nil
}
// SendBuffers sends buffers to peer. WireGuard packet data in each element of
// buffers must be preceded by MessageEncapsulatingTransportSize number of
// bytes.
func (peer *Peer) SendBuffers(buffers [][]byte) error {
peer.device.net.RLock()
defer peer.device.net.RUnlock()
@ -133,7 +136,7 @@ func (peer *Peer) SendBuffers(buffers [][]byte) error {
}
peer.endpoint.Unlock()
err := peer.device.net.bind.Send(buffers, endpoint)
err := peer.device.net.bind.Send(buffers, endpoint, MessageEncapsulatingTransportSize)
if err == nil {
var totalLen uint64
for _, b := range buffers {