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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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15
device/noise-protocol.go
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@ -61,13 +61,14 @@ const (
)
const (
MessageInitiationSize = 148 // size of handshake initiation message
MessageResponseSize = 92 // size of response message
MessageCookieReplySize = 64 // size of cookie reply message
MessageTransportHeaderSize = 16 // size of data preceding content in transport message
MessageTransportSize = MessageTransportHeaderSize + poly1305.TagSize // size of empty transport
MessageKeepaliveSize = MessageTransportSize // size of keepalive
MessageHandshakeSize = MessageInitiationSize // size of largest handshake related message
MessageInitiationSize = 148 // size of handshake initiation message
MessageResponseSize = 92 // size of response message
MessageCookieReplySize = 64 // size of cookie reply message
MessageTransportHeaderSize = 16 // size of data preceding content in transport message
MessageEncapsulatingTransportSize = 8 // size of optional, free (for use by conn.Bind.Send()) space preceding the transport header
MessageTransportSize = MessageTransportHeaderSize + poly1305.TagSize // size of empty transport
MessageKeepaliveSize = MessageTransportSize // size of keepalive
MessageHandshakeSize = MessageInitiationSize // size of largest handshake related message
)
const (