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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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10
device/device_test.go
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@ -426,11 +426,11 @@ type fakeBindSized struct {
func (b *fakeBindSized) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) {
return nil, 0, nil
}
func (b *fakeBindSized) Close() error { return nil }
func (b *fakeBindSized) SetMark(mark uint32) 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 }
func (b *fakeBindSized) Close() error { return nil }
func (b *fakeBindSized) SetMark(mark uint32) error { return nil }
func (b *fakeBindSized) Send(bufs [][]byte, ep conn.Endpoint, offset int) error { return nil }
func (b *fakeBindSized) ParseEndpoint(s string) (conn.Endpoint, error) { return nil, nil }
func (b *fakeBindSized) BatchSize() int { return b.size }
type fakeTUNDeviceSized struct {
size int