LooksLikeDiscoWrapper reports whether p looks like it's a packet containing an encrypted disco message.

MessageSummary returns a short summary of m for logging purposes.

Parse parses the encrypted part of the message from inside the nacl secretbox.

Source returns the slice of p that represents the disco public key source, and whether p looks like a disco message.

6 bytes: 0x54 53 f0 9f 92 ac.

NonceLen is the length of the nonces used by nacl secretboxes.

CallMeMaybe is a message sent only over DERP to request that the recipient try to open up a magicsock path back to the sender.

Pong is a response a Ping.

Message a discovery message.