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Merge pull request #169 from Arceliar/backpressure

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Neil Alexander 2018-07-22 10:14:27 +01:00 committed by GitHub
commit f53699367b
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2 changed files with 30 additions and 18 deletions
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25
src/yggdrasil/session.go
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@ -425,10 +425,33 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
if !sinfo.init {
return
} // To prevent using empty session keys
// Now we append something to the coords
// Specifically, we append a 0, and then arbitrary data
// The 0 ensures that the destination node switch forwards to the self peer (router)
// The rest is ignored, but it's still part as the coords, so it affects switch queues
// This helps separate traffic streams (protocol + source + dest port) are queued independently
var coords []byte
addUint64 := func(bs []byte) {
// Converts bytes to a uint64
// Converts that back to variable length bytes
// Appends it to coords
var u uint64
for _, b := range bs {
u <<= 8
u |= uint64(b)
}
coords = append(coords, wire_encode_uint64(u)...)
}
coords = append(coords, sinfo.coords...) // Start with the real coords
coords = append(coords, 0) // Add an explicit 0 for the destination's self peer
addUint64(bs[6:7]) // Byte 6, next header type (e.g. TCP vs UDP)
// TODO parse headers, in case the next header isn't TCP/UDP for some reason
addUint64(bs[40:42]) // Bytes 40-41, source port for TCP/UDP
addUint64(bs[42:44]) // Bytes 42-43, destination port for TCP/UDP
payload, nonce := boxSeal(&sinfo.sharedSesKey, bs, &sinfo.myNonce)
defer util_putBytes(payload)
p := wire_trafficPacket{
Coords: sinfo.coords,
Coords: coords,
Handle: sinfo.theirHandle,
Nonce: *nonce,
Payload: payload,

23
src/yggdrasil/switch.go
View File

@ -529,24 +529,13 @@ func switch_getPacketCoords(packet []byte) []byte {
}
// Returns a unique string for each stream of traffic
// Equal to type+coords+handle for traffic packets
// Equal to type+coords+toKey+fromKey for protocol traffic packets
// Equal to coords
// The sender may append arbitrary info to the end of coords (as long as it's begins with a 0x00) to designate separate traffic streams
// Currently, it's the IPv6 next header type and the first 2 uint16 of the next header
// This is equivalent to the TCP/UDP protocol numbers and the source / dest ports
// TODO figure out if something else would make more sense (other transport protocols?)
func switch_getPacketStreamID(packet []byte) string {
pType, pTypeLen := wire_decode_uint64(packet)
_, coordLen := wire_decode_coords(packet[pTypeLen:])
end := pTypeLen + coordLen
switch {
case pType == wire_Traffic:
end += handleLen // handle
case pType == wire_ProtocolTraffic:
end += 2 * boxPubKeyLen
default:
end = 0
}
if end > len(packet) {
end = len(packet)
}
return string(packet[:end])
return string(switch_getPacketCoords(packet))
}
// Handle an incoming packet