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Refactor path stability stuff and add basic multipath support.

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This commit is contained in:
Adam Ierymenko 2017-10-25 12:42:14 -07:00
parent 0d8b8d8426
commit 459f1e7bfb
14 changed files with 379 additions and 362 deletions
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81
node/Switch.cpp
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@ -169,68 +169,22 @@ void Switch::onRemotePacket(void *tPtr,const int64_t localSocket,const InetAddre
if (packet.hops() < ZT_RELAY_MAX_HOPS) {
packet.incrementHops();
SharedPtr<Peer> relayTo = RR->topology->getPeer(tPtr,destination);
if ((relayTo)&&(relayTo->sendDirect(tPtr,packet.data(),packet.size(),now,false))) {
if ((source != RR->identity.address())&&(_shouldUnite(now,source,destination))) { // don't send RENDEZVOUS for cluster frontplane relays
const InetAddress *hintToSource = (InetAddress *)0;
const InetAddress *hintToDest = (InetAddress *)0;
InetAddress destV4,destV6;
InetAddress sourceV4,sourceV6;
relayTo->getRendezvousAddresses(now,destV4,destV6);
if ((source != RR->identity.address())&&(_shouldUnite(now,source,destination))) {
const SharedPtr<Peer> sourcePeer(RR->topology->getPeer(tPtr,source));
if (sourcePeer) {
sourcePeer->getRendezvousAddresses(now,sourceV4,sourceV6);
if ((destV6)&&(sourceV6)) {
hintToSource = &destV6;
hintToDest = &sourceV6;
} else if ((destV4)&&(sourceV4)) {
hintToSource = &destV4;
hintToDest = &sourceV4;
}
if ((hintToSource)&&(hintToDest)) {
unsigned int alt = (unsigned int)RR->node->prng() & 1; // randomize which hint we send first for obscure NAT-t reasons
const unsigned int completed = alt + 2;
while (alt != completed) {
if ((alt & 1) == 0) {
Packet outp(source,RR->identity.address(),Packet::VERB_RENDEZVOUS);
outp.append((uint8_t)0);
destination.appendTo(outp);
outp.append((uint16_t)hintToSource->port());
if (hintToSource->ss_family == AF_INET6) {
outp.append((uint8_t)16);
outp.append(hintToSource->rawIpData(),16);
} else {
outp.append((uint8_t)4);
outp.append(hintToSource->rawIpData(),4);
}
send(tPtr,outp,true);
} else {
Packet outp(destination,RR->identity.address(),Packet::VERB_RENDEZVOUS);
outp.append((uint8_t)0);
source.appendTo(outp);
outp.append((uint16_t)hintToDest->port());
if (hintToDest->ss_family == AF_INET6) {
outp.append((uint8_t)16);
outp.append(hintToDest->rawIpData(),16);
} else {
outp.append((uint8_t)4);
outp.append(hintToDest->rawIpData(),4);
}
send(tPtr,outp,true);
}
++alt;
}
}
}
if (sourcePeer)
relayTo->introduce(tPtr,now,sourcePeer);
}
} else {
relayTo = RR->topology->getUpstreamPeer();
if ((relayTo)&&(relayTo->address() != source))
relayTo->sendDirect(tPtr,packet.data(),packet.size(),now,true);
if ((relayTo)&&(relayTo->address() != source)) {
if (relayTo->sendDirect(tPtr,packet.data(),packet.size(),now,true)) {
const SharedPtr<Peer> sourcePeer(RR->topology->getPeer(tPtr,source));
if (sourcePeer)
relayTo->introduce(tPtr,now,sourcePeer);
}
}
}
}
} else if ((reinterpret_cast<const uint8_t *>(data)[ZT_PACKET_IDX_FLAGS] & ZT_PROTO_FLAG_FRAGMENTED) != 0) {
@ -694,22 +648,7 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt)
const SharedPtr<Peer> peer(RR->topology->getPeer(tPtr,destination));
if (peer) {
/* First get the best path, and if it's dead (and this is not a root)
* we attempt to re-activate that path but this packet will flow
* upstream. If the path comes back alive, it will be used in the future.
* For roots we don't do the alive check since roots are not required
* to send heartbeats "down" and because we have to at least try to
* go somewhere. */
viaPath = peer->getBestPath(now,false);
if ( (viaPath) && (!viaPath->alive(now)) && (!RR->topology->isUpstream(peer->identity())) ) {
if ((now - viaPath->lastOut()) > std::max((now - viaPath->lastIn()) * 4,(int64_t)ZT_PATH_MIN_REACTIVATE_INTERVAL)) {
peer->attemptToContactAt(tPtr,viaPath->localSocket(),viaPath->address(),now,false,viaPath->nextOutgoingCounter());
viaPath->sent(now);
}
viaPath.zero();
}
if (!viaPath) {
peer->tryMemorizedPath(tPtr,now); // periodically attempt memorized or statically defined paths, if any are known
const SharedPtr<Peer> relay(RR->topology->getUpstreamPeer());