cwinfo/yggdrasil-go
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fix bug in switch actor's cleanRoot, strict nonce handling at the session level, and add separate queues per stream to the packetqueue code

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Arceliar
2020-04-03 19:26:48 -05:00
parent 03a19997b8
commit 09efdfef9a
3 changed files with 105 additions and 26 deletions
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12
src/yggdrasil/session.go
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@ -16,9 +16,6 @@ import (
"github.com/Arceliar/phony"
)
// Duration that we keep track of old nonces per session, to allow some out-of-order packet delivery
const nonceWindow = time.Second
// All the information we know about an active session.
// This includes coords, permanent and ephemeral keys, handles and nonces, various sorts of timing information for timeout and maintenance, and some metadata for the admin API.
type sessionInfo struct {
@ -394,14 +391,9 @@ func (sinfo *sessionInfo) _getMTU() MTU {
return sinfo.myMTU
}
// Checks if a packet's nonce is recent enough to fall within the window of allowed packets, and not already received.
// Checks if a packet's nonce is newer than any previously received
func (sinfo *sessionInfo) _nonceIsOK(theirNonce *crypto.BoxNonce) bool {
// The bitmask is to allow for some non-duplicate out-of-order packets
if theirNonce.Minus(&sinfo.theirNonce) > 0 {
// This is newer than the newest nonce we've seen
return true
}
return time.Since(sinfo.time) < nonceWindow
return theirNonce.Minus(&sinfo.theirNonce) > 0
}
// Updates the nonce mask by (possibly) shifting the bitmask and setting the bit corresponding to this nonce to 1, and then updating the most recent nonce