yggdrasil-network/yggdrasil-go
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limit how much switch cost can be changed by any 1 message

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This commit is contained in:
Arceliar 2018-11-17 20:57:50 -06:00
parent 5002ed19b9
commit df30e067b2
1 changed files with 16 additions and 2 deletions
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18
src/yggdrasil/switch.go
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@ -372,19 +372,33 @@ func (t *switchTable) unlockedHandleMsg(msg *switchMsg, fromPort switchPort, rep
// Reset the cost
sender.cost = 0
} else if sender.locator.tstamp > oldSender.locator.tstamp {
var lag time.Duration
if sender.locator.tstamp > t.data.locator.tstamp {
// Latency based on how early the last message arrived before the parent's
sender.cost += oldSender.time.Sub(t.time)
lag = oldSender.time.Sub(t.time)
} else {
// Waiting this long cost us something
sender.cost += now.Sub(t.time)
lag = now.Sub(t.time)
}
// Limit how much lag can affect things from a single packet
if lag > switch_parent_threshold/8 {
lag = switch_parent_threshold / 8
}
if lag < -switch_parent_threshold/8 {
lag = -switch_parent_threshold / 8
}
sender.cost += lag
// Limit how much the cost can move in total
if sender.cost < -switch_parent_threshold {
sender.cost = -switch_parent_threshold
}
if sender.cost > switch_parent_threshold {
sender.cost = switch_parent_threshold
}
if sender.port == t.parent {
// But always reset the parent's cost to 0, by definition
sender.cost = 0
}
}
if !equiv(&sender.locator, &oldSender.locator) {
doUpdate = true