mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
1975 lines
69 KiB
C++
1975 lines
69 KiB
C++
/*
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* Copyright (c)2013-2021 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2026-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#include "Bond.hpp"
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#include "Switch.hpp"
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#include <cmath>
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#include <cstdio>
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#include <string>
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#include <cinttypes> // for PRId64, etc. macros
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// FIXME: remove this suppression and actually fix warnings
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#ifdef __GNUC__
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#pragma GCC diagnostic ignored "-Wsign-compare"
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#endif
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namespace ZeroTier {
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static unsigned char s_freeRandomByteCounter = 0;
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int Bond::_minReqMonitorInterval = ZT_BOND_FAILOVER_DEFAULT_INTERVAL;
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uint8_t Bond::_defaultPolicy = ZT_BOND_POLICY_NONE;
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Phy<Bond*>* Bond::_phy;
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Binder* Bond::_binder;
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Mutex Bond::_bonds_m;
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Mutex Bond::_links_m;
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std::string Bond::_defaultPolicyStr;
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std::map<int64_t, SharedPtr<Bond> > Bond::_bonds;
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std::map<int64_t, std::string> Bond::_policyTemplateAssignments;
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std::map<std::string, SharedPtr<Bond> > Bond::_bondPolicyTemplates;
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std::map<std::string, std::vector<SharedPtr<Link> > > Bond::_linkDefinitions;
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std::map<std::string, std::map<std::string, SharedPtr<Link> > > Bond::_interfaceToLinkMap;
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bool Bond::linkAllowed(std::string& policyAlias, SharedPtr<Link> link)
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{
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if (! link) {
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return false;
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}
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bool foundInDefinitions = false;
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if (_linkDefinitions.count(policyAlias)) {
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auto it = _linkDefinitions[policyAlias].begin();
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while (it != _linkDefinitions[policyAlias].end()) {
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if (link->ifname() == (*it)->ifname()) {
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foundInDefinitions = true;
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break;
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}
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++it;
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}
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}
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return _linkDefinitions[policyAlias].empty() || foundInDefinitions;
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}
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void Bond::addCustomLink(std::string& policyAlias, SharedPtr<Link> link)
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{
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Mutex::Lock _l(_links_m);
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_linkDefinitions[policyAlias].push_back(link);
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auto search = _interfaceToLinkMap[policyAlias].find(link->ifname());
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if (search == _interfaceToLinkMap[policyAlias].end()) {
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link->setAsUserSpecified(true);
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_interfaceToLinkMap[policyAlias].insert(std::pair<std::string, SharedPtr<Link> >(link->ifname(), link));
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}
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}
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bool Bond::addCustomPolicy(const SharedPtr<Bond>& newBond)
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{
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Mutex::Lock _l(_bonds_m);
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if (! _bondPolicyTemplates.count(newBond->policyAlias())) {
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_bondPolicyTemplates[newBond->policyAlias()] = newBond;
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return true;
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}
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return false;
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}
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bool Bond::assignBondingPolicyToPeer(int64_t identity, const std::string& policyAlias)
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{
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Mutex::Lock _l(_bonds_m);
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if (! _policyTemplateAssignments.count(identity)) {
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_policyTemplateAssignments[identity] = policyAlias;
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return true;
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}
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return false;
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}
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SharedPtr<Bond> Bond::getBondByPeerId(int64_t identity)
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{
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Mutex::Lock _l(_bonds_m);
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return _bonds.count(identity) ? _bonds[identity] : SharedPtr<Bond>();
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}
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SharedPtr<Bond> Bond::createBond(const RuntimeEnvironment* renv, const SharedPtr<Peer>& peer)
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{
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Mutex::Lock _l(_bonds_m);
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int64_t identity = peer->identity().address().toInt();
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Bond* bond = nullptr;
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if (! _bonds.count(identity)) {
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if (! _policyTemplateAssignments.count(identity)) {
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if (_defaultPolicy) {
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bond = new Bond(renv, _defaultPolicy, peer);
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bond->debug("new default bond");
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}
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if (! _defaultPolicy && _defaultPolicyStr.length()) {
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bond = new Bond(renv, _bondPolicyTemplates[_defaultPolicyStr].ptr(), peer);
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bond->debug("new default custom bond (based on %s)", bond->getPolicyStrByCode(bond->policy()).c_str());
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}
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} else {
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if (! _bondPolicyTemplates[_policyTemplateAssignments[identity]]) {
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bond = new Bond(renv, _defaultPolicy, peer);
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bond->debug("peer-specific bond, was specified as %s but the bond definition was not found, using default %s", _policyTemplateAssignments[identity].c_str(), getPolicyStrByCode(_defaultPolicy).c_str());
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} else {
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bond = new Bond(renv, _bondPolicyTemplates[_policyTemplateAssignments[identity]].ptr(), peer);
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bond->debug("new default bond");
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}
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}
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}
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if (bond) {
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_bonds[identity] = bond;
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/**
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* Determine if user has specified anything that could affect the bonding policy's decisions
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*/
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if (_interfaceToLinkMap.count(bond->policyAlias())) {
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std::map<std::string, SharedPtr<Link> >::iterator it = _interfaceToLinkMap[bond->policyAlias()].begin();
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while (it != _interfaceToLinkMap[bond->policyAlias()].end()) {
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if (it->second->isUserSpecified()) {
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bond->_userHasSpecifiedLinks = true;
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}
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if (it->second->isUserSpecified() && it->second->primary()) {
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bond->_userHasSpecifiedPrimaryLink = true;
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}
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if (it->second->isUserSpecified() && it->second->userHasSpecifiedFailoverInstructions()) {
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bond->_userHasSpecifiedFailoverInstructions = true;
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}
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if (it->second->isUserSpecified() && (it->second->capacity() > 0)) {
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bond->_userHasSpecifiedLinkCapacities = true;
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}
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++it;
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}
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}
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bond->startBond();
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return bond;
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}
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return SharedPtr<Bond>();
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}
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void Bond::destroyBond(uint64_t peerId)
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{
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Mutex::Lock _l(_bonds_m);
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auto iter = _bonds.find(peerId);
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if (iter != _bonds.end()) {
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iter->second->stopBond();
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}
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_bonds.erase(peerId);
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}
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void Bond::stopBond()
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{
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debug("stopping bond");
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_run = false;
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}
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void Bond::startBond()
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{
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debug("starting bond");
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_run = true;
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}
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SharedPtr<Link> Bond::getLinkBySocket(const std::string& policyAlias, uint64_t localSocket, bool createIfNeeded = false)
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{
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Mutex::Lock _l(_links_m);
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char ifname[ZT_MAX_PHYSIFNAME] = {};
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_binder->getIfName((PhySocket*)((uintptr_t)localSocket), ifname, sizeof(ifname) - 1);
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std::string ifnameStr(ifname);
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auto search = _interfaceToLinkMap[policyAlias].find(ifnameStr);
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if (search == _interfaceToLinkMap[policyAlias].end()) {
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if (createIfNeeded) {
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SharedPtr<Link> s = new Link(ifnameStr, 0, 0, 0, true, ZT_BOND_SLAVE_MODE_PRIMARY, "");
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_interfaceToLinkMap[policyAlias].insert(std::pair<std::string, SharedPtr<Link> >(ifnameStr, s));
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return s;
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} else {
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return SharedPtr<Link>();
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}
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} else {
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return search->second;
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}
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}
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SharedPtr<Link> Bond::getLinkByName(const std::string& policyAlias, const std::string& ifname)
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{
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Mutex::Lock _l(_links_m);
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auto search = _interfaceToLinkMap[policyAlias].find(ifname);
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if (search != _interfaceToLinkMap[policyAlias].end()) {
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return search->second;
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}
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return SharedPtr<Link>();
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}
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void Bond::processBackgroundTasks(void* tPtr, const int64_t now)
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{
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unsigned long _currMinReqMonitorInterval = ZT_BOND_FAILOVER_DEFAULT_INTERVAL;
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Mutex::Lock _l(_bonds_m);
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std::map<int64_t, SharedPtr<Bond> >::iterator bondItr = _bonds.begin();
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while (bondItr != _bonds.end()) {
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// Update Bond Controller's background processing timer
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_currMinReqMonitorInterval = std::min(_currMinReqMonitorInterval, (unsigned long)(bondItr->second->monitorInterval()));
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bondItr->second->processBackgroundBondTasks(tPtr, now);
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++bondItr;
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}
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_minReqMonitorInterval = std::min(_currMinReqMonitorInterval, (unsigned long)ZT_BOND_FAILOVER_DEFAULT_INTERVAL);
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}
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Bond::Bond(const RuntimeEnvironment* renv) : RR(renv)
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{
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initTimers();
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}
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Bond::Bond(const RuntimeEnvironment* renv, int policy, const SharedPtr<Peer>& peer) : RR(renv), _freeRandomByte((unsigned char)((uintptr_t)this >> 4) ^ ++s_freeRandomByteCounter), _peer(peer), _peerId(_peer->_id.address().toInt())
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{
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initTimers();
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setBondParameters(policy, SharedPtr<Bond>(), false);
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_policyAlias = getPolicyStrByCode(policy);
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}
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Bond::Bond(const RuntimeEnvironment* renv, std::string& basePolicy, std::string& policyAlias, const SharedPtr<Peer>& peer) : RR(renv), _policyAlias(policyAlias), _peer(peer)
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{
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initTimers();
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setBondParameters(getPolicyCodeByStr(basePolicy), SharedPtr<Bond>(), false);
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}
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Bond::Bond(const RuntimeEnvironment* renv, SharedPtr<Bond> originalBond, const SharedPtr<Peer>& peer)
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: RR(renv)
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, _freeRandomByte((unsigned char)((uintptr_t)this >> 4) ^ ++s_freeRandomByteCounter)
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, _peer(peer)
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, _peerId(_peer->_id.address().toInt())
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{
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initTimers();
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setBondParameters(originalBond->_policy, originalBond, true);
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}
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void Bond::nominatePathToBond(const SharedPtr<Path>& path, int64_t now)
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{
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Mutex::Lock _l(_paths_m);
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debug("attempting to nominate link %s", pathToStr(path).c_str());
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/**
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* Ensure the link is allowed and the path is not already present
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*/
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if (! RR->bc->linkAllowed(_policyAlias, getLinkBySocket(_policyAlias, path->localSocket(), true))) {
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debug("link %s is not allowed according to user-specified rules", pathToStr(path).c_str());
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return;
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}
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bool alreadyPresent = false;
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for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
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// Sanity check
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if (path.ptr() == _paths[i].p.ptr()) {
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alreadyPresent = true;
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debug("link %s already exists", pathToStr(path).c_str());
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break;
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}
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}
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if (! alreadyPresent) {
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SharedPtr<Link> link = getLink(path);
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if (link) {
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std::string ifnameStr = std::string(link->ifname());
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memset(path->_ifname, 0x0, ZT_MAX_PHYSIFNAME);
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memcpy(path->_ifname, ifnameStr.c_str(), std::min((int)ifnameStr.length(), ZT_MAX_PHYSIFNAME));
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}
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/**
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* Find somewhere to stick it
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*/
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for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
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if (! _paths[i].p) {
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_paths[i].set(now, path);
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/**
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* Set user preferences and update state variables of other paths on the same link
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*/
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SharedPtr<Link> sl = getLink(_paths[i].p);
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if (sl) {
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// Determine if there are any other paths on this link
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bool bFoundCommonLink = false;
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SharedPtr<Link> commonLink = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
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if (commonLink) {
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for (unsigned int j = 0; j < ZT_MAX_PEER_NETWORK_PATHS; ++j) {
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if (_paths[j].p && _paths[j].p.ptr() != _paths[i].p.ptr()) {
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if (RR->bc->getLinkBySocket(_policyAlias, _paths[j].p->localSocket(), true) == commonLink) {
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bFoundCommonLink = true;
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_paths[j].onlyPathOnLink = false;
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}
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}
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}
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_paths[i].ipvPref = sl->ipvPref();
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_paths[i].mode = sl->mode();
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_paths[i].enabled = sl->enabled();
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_paths[i].onlyPathOnLink = ! bFoundCommonLink;
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}
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}
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log("nominated link %s", pathToStr(path).c_str());
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break;
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}
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}
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}
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curateBond(now, true);
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estimatePathQuality(now);
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}
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void Bond::addPathToBond(int nominatedIdx, int bondedIdx)
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{
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// Map bonded set to nominated set
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_realIdxMap[bondedIdx] = nominatedIdx;
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// Tell the bonding layer that we can now use this path for traffic
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_paths[nominatedIdx].bonded = true;
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}
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SharedPtr<Path> Bond::getAppropriatePath(int64_t now, int32_t flowId)
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{
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Mutex::Lock _l(_paths_m);
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/**
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* active-backup
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*/
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if (_policy == ZT_BOND_POLICY_ACTIVE_BACKUP) {
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if (_abPathIdx != ZT_MAX_PEER_NETWORK_PATHS && _paths[_abPathIdx].p) {
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return _paths[_abPathIdx].p;
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}
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}
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/**
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* broadcast
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*/
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if (_policy == ZT_BOND_POLICY_BROADCAST) {
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return SharedPtr<Path>(); // Handled in Switch::_trySend()
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}
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if (! _numBondedPaths) {
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return SharedPtr<Path>(); // No paths assigned to bond yet, cannot balance traffic
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}
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/**
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* balance-rr
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*/
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if (_policy == ZT_BOND_POLICY_BALANCE_RR) {
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if (_packetsPerLink == 0) {
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// Randomly select a path
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return _paths[_realIdxMap[_freeRandomByte % _numBondedPaths]].p;
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}
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if (_rrPacketsSentOnCurrLink < _packetsPerLink) {
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// Continue to use this link
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++_rrPacketsSentOnCurrLink;
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return _paths[_realIdxMap[_rrIdx]].p;
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}
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// Reset striping counter
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_rrPacketsSentOnCurrLink = 0;
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if (_numBondedPaths == 1 || _rrIdx >= (ZT_MAX_PEER_NETWORK_PATHS - 1)) {
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_rrIdx = 0;
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} else {
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int _tempIdx = _rrIdx;
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for (int searchCount = 0; searchCount < (_numBondedPaths - 1); searchCount++) {
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_tempIdx = (_tempIdx == (_numBondedPaths - 1)) ? 0 : _tempIdx + 1;
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if (_realIdxMap[_tempIdx] != ZT_MAX_PEER_NETWORK_PATHS) {
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if (_paths[_realIdxMap[_tempIdx]].p && _paths[_realIdxMap[_tempIdx]].eligible) {
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_rrIdx = _tempIdx;
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break;
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}
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}
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}
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}
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if (_paths[_realIdxMap[_rrIdx]].p) {
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return _paths[_realIdxMap[_rrIdx]].p;
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}
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}
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/**
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* balance-xor/aware
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*/
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if (_policy == ZT_BOND_POLICY_BALANCE_XOR || _policy == ZT_BOND_POLICY_BALANCE_AWARE) {
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if (flowId == -1) {
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// No specific path required for unclassified traffic, send on anything
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int m_idx = _realIdxMap[_freeRandomByte % _numBondedPaths];
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return _paths[m_idx].p;
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}
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Mutex::Lock _l(_flows_m);
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std::map<int16_t, SharedPtr<Flow> >::iterator it = _flows.find(flowId);
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if (likely(it != _flows.end())) {
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it->second->lastActivity = now;
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return _paths[it->second->assignedPath].p;
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} else {
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unsigned char entropy;
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Utils::getSecureRandom(&entropy, 1);
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SharedPtr<Flow> flow = createFlow(ZT_MAX_PEER_NETWORK_PATHS, flowId, entropy, now);
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_flows[flowId] = flow;
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return _paths[flow->assignedPath].p;
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}
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}
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return SharedPtr<Path>();
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}
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void Bond::recordIncomingInvalidPacket(const SharedPtr<Path>& path)
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{
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Mutex::Lock _l(_paths_m);
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for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
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if (_paths[i].p == path) {
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//_paths[i].packetValiditySamples.push(false);
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}
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}
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}
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void Bond::recordOutgoingPacket(const SharedPtr<Path>& path, uint64_t packetId, uint16_t payloadLength, const Packet::Verb verb, const int32_t flowId, int64_t now)
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{
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_freeRandomByte += (unsigned char)(packetId >> 8); // Grab entropy to use in path selection logic
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bool isFrame = (verb == Packet::Packet::VERB_ECHO || verb == Packet::VERB_FRAME || verb == Packet::VERB_EXT_FRAME);
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bool shouldRecord = (packetId & (ZT_QOS_ACK_DIVISOR - 1) && (verb != Packet::VERB_ACK) && (verb != Packet::VERB_QOS_MEASUREMENT));
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if (isFrame || shouldRecord) {
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Mutex::Lock _l(_paths_m);
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int pathIdx = getNominatedPathIdx(path);
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if (pathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
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return;
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}
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if (isFrame) {
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++(_paths[pathIdx].packetsOut);
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_lastFrame = now;
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}
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if (shouldRecord) {
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//_paths[pathIdx].expectingAckAsOf = now;
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//_paths[pathIdx].totalBytesSentSinceLastAckReceived += payloadLength;
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//_paths[pathIdx].unackedBytes += payloadLength;
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if (_paths[pathIdx].qosStatsOut.size() < ZT_QOS_MAX_PENDING_RECORDS) {
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_paths[pathIdx].qosStatsOut[packetId] = now;
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}
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}
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}
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if (flowId != ZT_QOS_NO_FLOW) {
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Mutex::Lock _l(_flows_m);
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if (_flows.count(flowId)) {
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_flows[flowId]->bytesOut += payloadLength;
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}
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}
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}
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void Bond::recordIncomingPacket(const SharedPtr<Path>& path, uint64_t packetId, uint16_t payloadLength, Packet::Verb verb, int32_t flowId, int64_t now)
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{
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bool isFrame = (verb == Packet::Packet::VERB_ECHO || verb == Packet::VERB_FRAME || verb == Packet::VERB_EXT_FRAME);
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bool shouldRecord = (packetId & (ZT_QOS_ACK_DIVISOR - 1) && (verb != Packet::VERB_ACK) && (verb != Packet::VERB_QOS_MEASUREMENT));
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Mutex::Lock _l(_paths_m);
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int pathIdx = getNominatedPathIdx(path);
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if (pathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
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return;
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}
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// Take note of the time that this previously-dead path received a packet
|
|
if (! _paths[pathIdx].alive) {
|
|
_paths[pathIdx].lastAliveToggle = now;
|
|
}
|
|
if (isFrame || shouldRecord) {
|
|
if (_paths[pathIdx].allowed()) {
|
|
if (isFrame) {
|
|
++(_paths[pathIdx].packetsIn);
|
|
_lastFrame = now;
|
|
}
|
|
if (shouldRecord) {
|
|
if (_paths[pathIdx].qosStatsIn.size() < ZT_QOS_MAX_PENDING_RECORDS) {
|
|
// debug("Recording QoS information (table size = %d)", _paths[pathIdx].qosStatsIn.size());
|
|
_paths[pathIdx].qosStatsIn[packetId] = now;
|
|
++(_paths[pathIdx].packetsReceivedSinceLastQoS);
|
|
//_paths[pathIdx].packetValiditySamples.push(true);
|
|
} else {
|
|
// debug("QoS buffer full, will not record information");
|
|
}
|
|
/*
|
|
if (_paths[pathIdx].ackStatsIn.size() < ZT_ACK_MAX_PENDING_RECORDS) {
|
|
//debug("Recording ACK information (table size = %d)", _paths[pathIdx].ackStatsIn.size());
|
|
_paths[pathIdx].ackStatsIn[packetId] = payloadLength;
|
|
++(_paths[pathIdx].packetsReceivedSinceLastAck);
|
|
}
|
|
else {
|
|
debug("ACK buffer full, will not record information");
|
|
}
|
|
*/
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Learn new flows and pro-actively create entries for them in the bond so
|
|
* that the next time we send a packet out that is part of a flow we know
|
|
* which path to use.
|
|
*/
|
|
if ((flowId != ZT_QOS_NO_FLOW) && (_policy == ZT_BOND_POLICY_BALANCE_RR || _policy == ZT_BOND_POLICY_BALANCE_XOR || _policy == ZT_BOND_POLICY_BALANCE_AWARE)) {
|
|
Mutex::Lock _l(_flows_m);
|
|
SharedPtr<Flow> flow;
|
|
if (! _flows.count(flowId)) {
|
|
flow = createFlow(pathIdx, flowId, 0, now);
|
|
} else {
|
|
flow = _flows[flowId];
|
|
}
|
|
if (flow) {
|
|
flow->bytesIn += payloadLength;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::receivedQoS(const SharedPtr<Path>& path, int64_t now, int count, uint64_t* rx_id, uint16_t* rx_ts)
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
int pathIdx = getNominatedPathIdx(path);
|
|
if (pathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
|
|
return;
|
|
}
|
|
_paths[pathIdx].lastQoSReceived = now;
|
|
// debug("received QoS packet (sampling %d frames) via %s", count, pathToStr(path).c_str());
|
|
// Look up egress times and compute latency values for each record
|
|
std::map<uint64_t, uint64_t>::iterator it;
|
|
for (int j = 0; j < count; j++) {
|
|
it = _paths[pathIdx].qosStatsOut.find(rx_id[j]);
|
|
if (it != _paths[pathIdx].qosStatsOut.end()) {
|
|
_paths[pathIdx].latencySamples.push(((uint16_t)(now - it->second) - rx_ts[j]) / 2);
|
|
// if (_paths[pathIdx].shouldAvoid) {
|
|
// debug("RX sample on avoided path %d", pathIdx);
|
|
// }
|
|
_paths[pathIdx].qosStatsOut.erase(it);
|
|
}
|
|
}
|
|
_paths[pathIdx].qosRecordSize.push(count);
|
|
}
|
|
|
|
void Bond::receivedAck(int pathIdx, int64_t now, int32_t ackedBytes)
|
|
{
|
|
/*
|
|
Mutex::Lock _l(_paths_m);
|
|
debug("received ACK of %d bytes on path %s, there are still %d un-acked bytes", ackedBytes, pathToStr(_paths[pathIdx].p).c_str(), _paths[pathIdx].unackedBytes);
|
|
_paths[pathIdx].lastAckReceived = now;
|
|
_paths[pathIdx].unackedBytes = (ackedBytes > _paths[pathIdx].unackedBytes) ? 0 : _paths[pathIdx].unackedBytes - ackedBytes;
|
|
*/
|
|
}
|
|
|
|
int32_t Bond::generateQoSPacket(int pathIdx, int64_t now, char* qosBuffer)
|
|
{
|
|
int32_t len = 0;
|
|
std::map<uint64_t, uint64_t>::iterator it = _paths[pathIdx].qosStatsIn.begin();
|
|
int i = 0;
|
|
int numRecords = std::min(_paths[pathIdx].packetsReceivedSinceLastQoS, ZT_QOS_TABLE_SIZE);
|
|
// debug("numRecords=%3d, packetsReceivedSinceLastQoS=%3d, _paths[pathIdx].qosStatsIn.size()=%3zu", numRecords, _paths[pathIdx].packetsReceivedSinceLastQoS, _paths[pathIdx].qosStatsIn.size());
|
|
while (i < numRecords && it != _paths[pathIdx].qosStatsIn.end()) {
|
|
uint64_t id = it->first;
|
|
memcpy(qosBuffer, &id, sizeof(uint64_t));
|
|
qosBuffer += sizeof(uint64_t);
|
|
uint16_t holdingTime = (uint16_t)(now - it->second);
|
|
memcpy(qosBuffer, &holdingTime, sizeof(uint16_t));
|
|
qosBuffer += sizeof(uint16_t);
|
|
len += sizeof(uint64_t) + sizeof(uint16_t);
|
|
_paths[pathIdx].qosStatsIn.erase(it++);
|
|
++i;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
bool Bond::assignFlowToBondedPath(SharedPtr<Flow>& flow, int64_t now, bool reassign = false)
|
|
{
|
|
if (! _numBondedPaths) {
|
|
debug("unable to assign flow %x (bond has no links)", flow->id);
|
|
return false;
|
|
}
|
|
unsigned int bondedIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
if (_policy == ZT_BOND_POLICY_BALANCE_XOR) {
|
|
bondedIdx = abs((int)(flow->id % _numBondedPaths));
|
|
flow->assignPath(_realIdxMap[bondedIdx], now);
|
|
++(_paths[_realIdxMap[bondedIdx]].assignedFlowCount);
|
|
}
|
|
if (_policy == ZT_BOND_POLICY_BALANCE_AWARE) {
|
|
/** balance-aware generally works like balance-xor except that it will try to
|
|
* take into account user preferences (or default sane limits) that will discourage
|
|
* allocating traffic to links with a lesser perceived "quality" */
|
|
int offset = 0;
|
|
float bestQuality = 0.0;
|
|
int nextBestQualIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
|
|
if (reassign) {
|
|
log("attempting to re-assign out-flow %04x previously on idx %d (%u / %zu flows)", flow->id, flow->assignedPath, _paths[_realIdxMap[flow->assignedPath]].assignedFlowCount, _flows.size());
|
|
} else {
|
|
debug("attempting to assign flow for the first time");
|
|
}
|
|
|
|
unsigned char entropy;
|
|
Utils::getSecureRandom(&entropy, 1);
|
|
float randomLinkCapacity = ((float)entropy / 255.0); // Used to random but proportional choices
|
|
|
|
while (offset < _numBondedPaths) {
|
|
unsigned char entropy;
|
|
Utils::getSecureRandom(&entropy, 1);
|
|
|
|
if (reassign) {
|
|
bondedIdx = (flow->assignedPath + offset) % (_numBondedPaths);
|
|
} else {
|
|
bondedIdx = abs((int)((entropy + offset) % (_numBondedPaths)));
|
|
}
|
|
// debug("idx=%d, offset=%d, randomCap=%f, actualCap=%f", bondedIdx, offset, randomLinkCapacity, _paths[_realIdxMap[bondedIdx]].relativeLinkCapacity);
|
|
if (! _paths[_realIdxMap[bondedIdx]].p) {
|
|
continue;
|
|
}
|
|
if (! _paths[_realIdxMap[bondedIdx]].shouldAvoid && randomLinkCapacity <= _paths[_realIdxMap[bondedIdx]].relativeLinkCapacity) {
|
|
// debug(" assign out-flow %04x to link %s (%u / %zu flows)", flow->id, pathToStr(_paths[_realIdxMap[bondedIdx]].p).c_str(), _paths[_realIdxMap[bondedIdx]].assignedFlowCount, _flows.size());
|
|
break; // Acceptable -- No violation of quality spec
|
|
}
|
|
if (_paths[_realIdxMap[bondedIdx]].relativeQuality > bestQuality) {
|
|
bestQuality = _paths[_realIdxMap[bondedIdx]].relativeQuality;
|
|
nextBestQualIdx = bondedIdx;
|
|
// debug(" recording next-best link %f idx %d", _paths[_realIdxMap[bondedIdx]].relativeQuality, bondedIdx);
|
|
}
|
|
++offset;
|
|
}
|
|
if (offset < _numBondedPaths) {
|
|
// We were (able) to find a path that didn't violate any of the user's quality requirements
|
|
flow->assignPath(_realIdxMap[bondedIdx], now);
|
|
++(_paths[_realIdxMap[bondedIdx]].assignedFlowCount);
|
|
// debug(" ABLE to find optimal link %f idx %d", _paths[_realIdxMap[bondedIdx]].relativeQuality, bondedIdx);
|
|
} else {
|
|
// We were (unable) to find a path that didn't violate at least one quality requirement, will choose next best option
|
|
flow->assignPath(_realIdxMap[nextBestQualIdx], now);
|
|
++(_paths[_realIdxMap[nextBestQualIdx]].assignedFlowCount);
|
|
// debug(" UNABLE to find, will use link %f idx %d", _paths[_realIdxMap[nextBestQualIdx]].relativeQuality, nextBestQualIdx);
|
|
}
|
|
}
|
|
if (_policy == ZT_BOND_POLICY_ACTIVE_BACKUP) {
|
|
if (_abPathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
|
|
log("unable to assign out-flow %x (no active backup link)", flow->id);
|
|
}
|
|
flow->assignPath(_abPathIdx, now);
|
|
}
|
|
log("assign out-flow %04x to link %s (%u / %zu flows)", flow->id, pathToStr(_paths[flow->assignedPath].p).c_str(), _paths[flow->assignedPath].assignedFlowCount, _flows.size());
|
|
return true;
|
|
}
|
|
|
|
SharedPtr<Bond::Flow> Bond::createFlow(int pathIdx, int32_t flowId, unsigned char entropy, int64_t now)
|
|
{
|
|
if (! _numBondedPaths) {
|
|
debug("unable to assign flow %04x (bond has no links)", flowId);
|
|
return SharedPtr<Flow>();
|
|
}
|
|
if (_flows.size() >= ZT_FLOW_MAX_COUNT) {
|
|
debug("forget oldest flow (max flows reached: %d)", ZT_FLOW_MAX_COUNT);
|
|
forgetFlowsWhenNecessary(0, true, now);
|
|
}
|
|
SharedPtr<Flow> flow = new Flow(flowId, now);
|
|
_flows[flowId] = flow;
|
|
/**
|
|
* Add a flow with a given Path already provided. This is the case when a packet
|
|
* is received on a path but no flow exists, in this case we simply assign the path
|
|
* that the remote peer chose for us.
|
|
*/
|
|
if (pathIdx != ZT_MAX_PEER_NETWORK_PATHS) {
|
|
flow->assignPath(pathIdx, now);
|
|
_paths[pathIdx].assignedFlowCount++;
|
|
debug("assign in-flow %04x to link %s (%u / %zu)", flow->id, pathToStr(_paths[pathIdx].p).c_str(), _paths[pathIdx].assignedFlowCount, _flows.size());
|
|
}
|
|
/**
|
|
* Add a flow when no path was provided. This means that it is an outgoing packet
|
|
* and that it is up to the local peer to decide how to load-balance its transmission.
|
|
*/
|
|
else {
|
|
assignFlowToBondedPath(flow, now);
|
|
}
|
|
return flow;
|
|
}
|
|
|
|
void Bond::forgetFlowsWhenNecessary(uint64_t age, bool oldest, int64_t now)
|
|
{
|
|
std::map<int16_t, SharedPtr<Flow> >::iterator it = _flows.begin();
|
|
std::map<int16_t, SharedPtr<Flow> >::iterator oldestFlow = _flows.end();
|
|
SharedPtr<Flow> expiredFlow;
|
|
if (age) { // Remove by specific age
|
|
while (it != _flows.end()) {
|
|
if (it->second->age(now) > age) {
|
|
debug("forget flow %04x (age %" PRId64 ") (%u / %zu)", it->first, it->second->age(now), _paths[it->second->assignedPath].assignedFlowCount, (_flows.size() - 1));
|
|
_paths[it->second->assignedPath].assignedFlowCount--;
|
|
it = _flows.erase(it);
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
} else if (oldest) { // Remove single oldest by natural expiration
|
|
uint64_t maxAge = 0;
|
|
while (it != _flows.end()) {
|
|
if (it->second->age(now) > maxAge) {
|
|
maxAge = (now - it->second->age(now));
|
|
oldestFlow = it;
|
|
}
|
|
++it;
|
|
}
|
|
if (oldestFlow != _flows.end()) {
|
|
debug("forget oldest flow %04x (age %" PRId64 ") (total flows: %zu)", oldestFlow->first, oldestFlow->second->age(now), _flows.size() - 1);
|
|
_paths[oldestFlow->second->assignedPath].assignedFlowCount--;
|
|
_flows.erase(oldestFlow);
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::processIncomingPathNegotiationRequest(uint64_t now, SharedPtr<Path>& path, int16_t remoteUtility)
|
|
{
|
|
char pathStr[64] = { 0 };
|
|
if (_abLinkSelectMethod != ZT_BOND_RESELECTION_POLICY_OPTIMIZE) {
|
|
return;
|
|
}
|
|
Mutex::Lock _l(_paths_m);
|
|
int pathIdx = getNominatedPathIdx(path);
|
|
if (pathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
|
|
return;
|
|
}
|
|
_paths[pathIdx].p->address().toString(pathStr);
|
|
if (! _lastPathNegotiationCheck) {
|
|
return;
|
|
}
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[pathIdx].p->localSocket());
|
|
if (link) {
|
|
if (remoteUtility > _localUtility) {
|
|
_paths[pathIdx].p->address().toString(pathStr);
|
|
debug("peer suggests alternate link %s/%s, remote utility (%d) greater than local utility (%d), switching to suggested link\n", link->ifname().c_str(), pathStr, remoteUtility, _localUtility);
|
|
_negotiatedPathIdx = pathIdx;
|
|
}
|
|
if (remoteUtility < _localUtility) {
|
|
debug("peer suggests alternate link %s/%s, remote utility (%d) less than local utility (%d), not switching\n", link->ifname().c_str(), pathStr, remoteUtility, _localUtility);
|
|
}
|
|
if (remoteUtility == _localUtility) {
|
|
debug("peer suggests alternate link %s/%s, remote utility (%d) equal to local utility (%d)\n", link->ifname().c_str(), pathStr, remoteUtility, _localUtility);
|
|
if (_peer->_id.address().toInt() > RR->node->identity().address().toInt()) {
|
|
debug("agree with peer to use alternate link %s/%s\n", link->ifname().c_str(), pathStr);
|
|
_negotiatedPathIdx = pathIdx;
|
|
} else {
|
|
debug("ignore petition from peer to use alternate link %s/%s\n", link->ifname().c_str(), pathStr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::pathNegotiationCheck(void* tPtr, int64_t now)
|
|
{
|
|
int maxInPathIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
int maxOutPathIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
uint64_t maxInCount = 0;
|
|
uint64_t maxOutCount = 0;
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p) {
|
|
continue;
|
|
}
|
|
if (_paths[i].packetsIn > maxInCount) {
|
|
maxInCount = _paths[i].packetsIn;
|
|
maxInPathIdx = i;
|
|
}
|
|
if (_paths[i].packetsOut > maxOutCount) {
|
|
maxOutCount = _paths[i].packetsOut;
|
|
maxOutPathIdx = i;
|
|
}
|
|
_paths[i].resetPacketCounts();
|
|
}
|
|
bool _peerLinksSynchronized = ((maxInPathIdx != ZT_MAX_PEER_NETWORK_PATHS) && (maxOutPathIdx != ZT_MAX_PEER_NETWORK_PATHS) && (maxInPathIdx != maxOutPathIdx)) ? false : true;
|
|
/**
|
|
* Determine utility and attempt to petition remote peer to switch to our chosen path
|
|
*/
|
|
if (! _peerLinksSynchronized) {
|
|
_localUtility = _paths[maxOutPathIdx].failoverScore - _paths[maxInPathIdx].failoverScore;
|
|
if (_paths[maxOutPathIdx].negotiated) {
|
|
_localUtility -= ZT_BOND_FAILOVER_HANDICAP_NEGOTIATED;
|
|
}
|
|
if ((now - _lastSentPathNegotiationRequest) > ZT_PATH_NEGOTIATION_CUTOFF_TIME) {
|
|
// fprintf(stderr, "BT: (sync) it's been long enough, sending more requests.\n");
|
|
_numSentPathNegotiationRequests = 0;
|
|
}
|
|
if (_numSentPathNegotiationRequests < ZT_PATH_NEGOTIATION_TRY_COUNT) {
|
|
if (_localUtility >= 0) {
|
|
// fprintf(stderr, "BT: (sync) paths appear to be out of sync (utility=%d)\n", _localUtility);
|
|
sendPATH_NEGOTIATION_REQUEST(tPtr, _paths[maxOutPathIdx].p);
|
|
++_numSentPathNegotiationRequests;
|
|
_lastSentPathNegotiationRequest = now;
|
|
// fprintf(stderr, "sending request to use %s on %s, ls=%llx, utility=%d\n", pathStr, link->ifname().c_str(), _paths[maxOutPathIdx].p->localSocket(), _localUtility);
|
|
}
|
|
}
|
|
/**
|
|
* Give up negotiating and consider switching
|
|
*/
|
|
else if ((now - _lastSentPathNegotiationRequest) > (2 * ZT_BOND_OPTIMIZE_INTERVAL)) {
|
|
if (_localUtility == 0) {
|
|
// There's no loss to us, just switch without sending a another request
|
|
// fprintf(stderr, "BT: (sync) giving up, switching to remote peer's path.\n");
|
|
_negotiatedPathIdx = maxInPathIdx;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::sendPATH_NEGOTIATION_REQUEST(void* tPtr, int pathIdx)
|
|
{
|
|
debug("send link negotiation request to peer via link %s, local utility is %d", pathToStr(_paths[pathIdx].p).c_str(), _localUtility);
|
|
if (_abLinkSelectMethod != ZT_BOND_RESELECTION_POLICY_OPTIMIZE) {
|
|
return;
|
|
}
|
|
Packet outp(_peer->_id.address(), RR->identity.address(), Packet::VERB_PATH_NEGOTIATION_REQUEST);
|
|
outp.append<int16_t>(_localUtility);
|
|
if (_paths[pathIdx].p->address()) {
|
|
Metrics::pkt_path_negotiation_request_out++;
|
|
outp.armor(_peer->key(), false, _peer->aesKeysIfSupported());
|
|
RR->node->putPacket(tPtr, _paths[pathIdx].p->localSocket(), _paths[pathIdx].p->address(), outp.data(), outp.size());
|
|
_overheadBytes += outp.size();
|
|
}
|
|
}
|
|
|
|
void Bond::sendACK(void* tPtr, int pathIdx, int64_t localSocket, const InetAddress& atAddress, int64_t now)
|
|
{
|
|
/*
|
|
Packet outp(_peer->_id.address(), RR->identity.address(), Packet::VERB_ACK);
|
|
int32_t bytesToAck = 0;
|
|
std::map<uint64_t, uint64_t>::iterator it = _paths[pathIdx].ackStatsIn.begin();
|
|
while (it != _paths[pathIdx].ackStatsIn.end()) {
|
|
bytesToAck += it->second;
|
|
++it;
|
|
}
|
|
debug("sending ACK of %d bytes on path %s (table size = %zu)", bytesToAck, pathToStr(_paths[pathIdx].p).c_str(), _paths[pathIdx].ackStatsIn.size());
|
|
outp.append<uint32_t>(bytesToAck);
|
|
if (atAddress) {
|
|
outp.armor(_peer->key(), false, _peer->aesKeysIfSupported());
|
|
RR->node->putPacket(tPtr, localSocket, atAddress, outp.data(), outp.size());
|
|
}
|
|
else {
|
|
RR->sw->send(tPtr, outp, false);
|
|
}
|
|
_paths[pathIdx].ackStatsIn.clear();
|
|
_paths[pathIdx].packetsReceivedSinceLastAck = 0;
|
|
_paths[pathIdx].lastAckSent = now;
|
|
*/
|
|
}
|
|
|
|
void Bond::sendQOS_MEASUREMENT(void* tPtr, int pathIdx, int64_t localSocket, const InetAddress& atAddress, int64_t now)
|
|
{
|
|
int64_t _now = RR->node->now();
|
|
Packet outp(_peer->_id.address(), RR->identity.address(), Packet::VERB_QOS_MEASUREMENT);
|
|
char qosData[ZT_QOS_MAX_PACKET_SIZE];
|
|
int16_t len = generateQoSPacket(pathIdx, _now, qosData);
|
|
if (len) {
|
|
// debug("sending QOS via link %s (len=%d)", pathToStr(_paths[pathIdx].p).c_str(), len);
|
|
outp.append(qosData, len);
|
|
if (atAddress) {
|
|
outp.armor(_peer->key(), false, _peer->aesKeysIfSupported());
|
|
RR->node->putPacket(tPtr, localSocket, atAddress, outp.data(), outp.size());
|
|
} else {
|
|
RR->sw->send(tPtr, outp, false);
|
|
}
|
|
Metrics::pkt_qos_out++;
|
|
_paths[pathIdx].packetsReceivedSinceLastQoS = 0;
|
|
_paths[pathIdx].lastQoSMeasurement = now;
|
|
_overheadBytes += outp.size();
|
|
}
|
|
}
|
|
|
|
void Bond::processBackgroundBondTasks(void* tPtr, int64_t now)
|
|
{
|
|
if (! _run) {
|
|
return;
|
|
}
|
|
if (! _peer->_localMultipathSupported || (now - _lastBackgroundTaskCheck) < ZT_BOND_BACKGROUND_TASK_MIN_INTERVAL) {
|
|
return;
|
|
}
|
|
_lastBackgroundTaskCheck = now;
|
|
Mutex::Lock _l(_paths_m);
|
|
|
|
curateBond(now, false);
|
|
if ((now - _lastQualityEstimation) > _qualityEstimationInterval) {
|
|
_lastQualityEstimation = now;
|
|
estimatePathQuality(now);
|
|
}
|
|
dumpInfo(now, false);
|
|
|
|
// Send ambient monitoring traffic
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].allowed()) {
|
|
if (_isLeaf) {
|
|
if ((_monitorInterval > 0) && (((now - _paths[i].p->_lastIn) >= (_paths[i].alive ? _monitorInterval : _failoverInterval)))) {
|
|
if ((_peer->remoteVersionProtocol() >= 5) && (! ((_peer->remoteVersionMajor() == 1) && (_peer->remoteVersionMinor() == 1) && (_peer->remoteVersionRevision() == 0)))) {
|
|
Packet outp(_peer->address(), RR->identity.address(), Packet::VERB_ECHO); // ECHO (this is our bond's heartbeat)
|
|
outp.armor(_peer->key(), true, _peer->aesKeysIfSupported());
|
|
RR->node->expectReplyTo(outp.packetId());
|
|
RR->node->putPacket(tPtr, _paths[i].p->localSocket(), _paths[i].p->address(), outp.data(), outp.size());
|
|
_paths[i].p->_lastOut = now;
|
|
_overheadBytes += outp.size();
|
|
Metrics::pkt_echo_out++;
|
|
// debug("tx: verb 0x%-2x of len %4d via %s (ECHO)", Packet::VERB_ECHO, outp.size(), pathToStr(_paths[i].p).c_str());
|
|
}
|
|
}
|
|
// QOS
|
|
if (_paths[i].needsToSendQoS(now, _qosSendInterval)) {
|
|
sendQOS_MEASUREMENT(tPtr, i, _paths[i].p->localSocket(), _paths[i].p->address(), now);
|
|
}
|
|
// ACK
|
|
/*
|
|
if (_paths[i].needsToSendAck(now, _ackSendInterval)) {
|
|
sendACK(tPtr, i, _paths[i].p->localSocket(), _paths[i].p->address(), now);
|
|
}
|
|
*/
|
|
}
|
|
}
|
|
}
|
|
// Perform periodic background tasks unique to each bonding policy
|
|
switch (_policy) {
|
|
case ZT_BOND_POLICY_ACTIVE_BACKUP:
|
|
processActiveBackupTasks(tPtr, now);
|
|
break;
|
|
case ZT_BOND_POLICY_BROADCAST:
|
|
break;
|
|
case ZT_BOND_POLICY_BALANCE_RR:
|
|
case ZT_BOND_POLICY_BALANCE_XOR:
|
|
case ZT_BOND_POLICY_BALANCE_AWARE:
|
|
processBalanceTasks(now);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
// Check whether or not a path negotiation needs to be performed
|
|
if (((now - _lastPathNegotiationCheck) > ZT_BOND_OPTIMIZE_INTERVAL) && _allowPathNegotiation) {
|
|
_lastPathNegotiationCheck = now;
|
|
pathNegotiationCheck(tPtr, now);
|
|
}
|
|
}
|
|
|
|
void Bond::curateBond(int64_t now, bool rebuildBond)
|
|
{
|
|
uint8_t tmpNumAliveLinks = 0;
|
|
uint8_t tmpNumTotalLinks = 0;
|
|
|
|
/**
|
|
* Update path state variables. State variables are used so that critical
|
|
* blocks that perform fast packet processing won't need to make as many
|
|
* function calls or computations.
|
|
*/
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p) {
|
|
continue;
|
|
}
|
|
|
|
// Whether this path is still in its trial period
|
|
bool inTrial = (now - _paths[i].whenNominated) < ZT_BOND_OPTIMIZE_INTERVAL;
|
|
|
|
/**
|
|
* Remove expired or invalid links from bond
|
|
*/
|
|
SharedPtr<Link> link = getLink(_paths[i].p);
|
|
if (! link) {
|
|
log("link is no longer valid, removing from bond");
|
|
_paths[i].p->_valid = false;
|
|
_paths[i] = NominatedPath();
|
|
_paths[i].p = SharedPtr<Path>();
|
|
continue;
|
|
}
|
|
if ((now - _paths[i].lastEligibility) > (ZT_PEER_EXPIRED_PATH_TRIAL_PERIOD) && ! inTrial) {
|
|
log("link (%s) has expired or is invalid, removing from bond", pathToStr(_paths[i].p).c_str());
|
|
_paths[i] = NominatedPath();
|
|
_paths[i].p = SharedPtr<Path>();
|
|
continue;
|
|
}
|
|
|
|
tmpNumTotalLinks++;
|
|
if (_paths[i].eligible) {
|
|
tmpNumAliveLinks++;
|
|
}
|
|
|
|
/**
|
|
* Determine aliveness
|
|
*/
|
|
_paths[i].alive = _isLeaf ? (now - _paths[i].p->_lastIn) < _failoverInterval : (now - _paths[i].p->_lastIn) < ZT_PEER_PATH_EXPIRATION;
|
|
|
|
/**
|
|
* Determine current eligibility
|
|
*/
|
|
bool currEligibility = false;
|
|
// Simple RX age (driven by packets of any type and gratuitous VERB_HELLOs)
|
|
bool acceptableAge = _isLeaf ? (_paths[i].p->age(now) < (_failoverInterval + _downDelay)) : _paths[i].alive;
|
|
// Whether we've waited long enough since the link last came online
|
|
bool satisfiedUpDelay = (now - _paths[i].lastAliveToggle) >= _upDelay;
|
|
// How long since the last QoS was received (Must be less than ZT_PEER_PATH_EXPIRATION since the remote peer's _qosSendInterval isn't known)
|
|
bool acceptableQoSAge = _paths[i].lastQoSReceived == 0 || ((now - _paths[i].lastQoSReceived) < ZT_PEER_EXPIRED_PATH_TRIAL_PERIOD);
|
|
currEligibility = _paths[i].allowed() && ((acceptableAge && satisfiedUpDelay && acceptableQoSAge) || inTrial);
|
|
|
|
if (currEligibility) {
|
|
_paths[i].lastEligibility = now;
|
|
}
|
|
|
|
/**
|
|
* Note eligibility state change (if any) and take appropriate action
|
|
*/
|
|
if (currEligibility != _paths[i].eligible) {
|
|
if (currEligibility == 0) {
|
|
log("link %s is no longer eligible", pathToStr(_paths[i].p).c_str());
|
|
}
|
|
if (currEligibility == 1) {
|
|
log("link %s is eligible", pathToStr(_paths[i].p).c_str());
|
|
}
|
|
debug("\t[%d] allowed=%d, age=%d, qa=%d, ud=%d, trial=%d", i, _paths[i].allowed(), acceptableAge, acceptableQoSAge, satisfiedUpDelay, inTrial);
|
|
dumpPathStatus(now, i);
|
|
if (currEligibility) {
|
|
rebuildBond = true;
|
|
}
|
|
if (! currEligibility) {
|
|
_paths[i].adjustRefractoryPeriod(now, _defaultPathRefractoryPeriod, ! currEligibility);
|
|
if (_paths[i].bonded) {
|
|
debug("link %s was bonded, flow reallocation will occur soon", pathToStr(_paths[i].p).c_str());
|
|
rebuildBond = true;
|
|
_paths[i].shouldAvoid = true;
|
|
_paths[i].bonded = false;
|
|
}
|
|
}
|
|
}
|
|
if (currEligibility) {
|
|
_paths[i].adjustRefractoryPeriod(now, _defaultPathRefractoryPeriod, false);
|
|
}
|
|
_paths[i].eligible = currEligibility;
|
|
}
|
|
|
|
/**
|
|
* Trigger status report if number of links change
|
|
*/
|
|
_numAliveLinks = tmpNumAliveLinks;
|
|
_numTotalLinks = tmpNumTotalLinks;
|
|
if ((_numAliveLinks != tmpNumAliveLinks) || (_numTotalLinks != tmpNumTotalLinks)) {
|
|
dumpInfo(now, true);
|
|
}
|
|
|
|
/**
|
|
* Check for failure of (all) primary links and inform bond to use spares if present
|
|
*/
|
|
bool foundUsablePrimaryPath = false;
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
// debug("[%d], bonded=%d, alive=%d", i, _paths[i].bonded , _paths[i].alive);
|
|
if (_paths[i].p && _paths[i].bonded && _paths[i].alive) {
|
|
foundUsablePrimaryPath = true;
|
|
}
|
|
}
|
|
rebuildBond = rebuildBond ? true : ! foundUsablePrimaryPath;
|
|
|
|
/**
|
|
* Curate the set of paths that are part of the bond proper. Select a set of paths
|
|
* per logical link according to eligibility and user-specified constraints.
|
|
*/
|
|
if ((_policy == ZT_BOND_POLICY_BALANCE_RR) || (_policy == ZT_BOND_POLICY_BALANCE_XOR) || (_policy == ZT_BOND_POLICY_BALANCE_AWARE)) {
|
|
if (! _numBondedPaths) {
|
|
rebuildBond = true;
|
|
}
|
|
if (rebuildBond) {
|
|
// Clear previous bonded index mapping
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
_realIdxMap[i] = ZT_MAX_PEER_NETWORK_PATHS;
|
|
_paths[i].bonded = false;
|
|
}
|
|
|
|
int updatedBondedPathCount = 0;
|
|
// Build map associating paths with local physical links. Will be selected from in next step
|
|
std::map<SharedPtr<Link>, std::vector<int> > linkMap;
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (link) {
|
|
linkMap[link].push_back(i);
|
|
}
|
|
}
|
|
}
|
|
// Re-form bond from link<->path map
|
|
std::map<SharedPtr<Link>, std::vector<int> >::iterator it = linkMap.begin();
|
|
while (it != linkMap.end()) {
|
|
SharedPtr<Link> link = it->first;
|
|
|
|
// Bond a spare link if required (no viable primary links left)
|
|
if (! foundUsablePrimaryPath) {
|
|
debug("no usable primary links remain, will attempt to use spare if available");
|
|
for (int j = 0; j < it->second.size(); j++) {
|
|
int idx = it->second.at(j);
|
|
if (! _paths[idx].p || ! _paths[idx].eligible || ! _paths[idx].allowed() || ! _paths[idx].isSpare()) {
|
|
continue;
|
|
}
|
|
addPathToBond(idx, updatedBondedPathCount);
|
|
++updatedBondedPathCount;
|
|
debug("add %s (spare)", pathToStr(_paths[idx].p).c_str());
|
|
}
|
|
}
|
|
|
|
int ipvPref = link->ipvPref();
|
|
|
|
// If user has no address type preference, then use every path we find on a link
|
|
if (ipvPref == 0) {
|
|
for (int j = 0; j < it->second.size(); j++) {
|
|
int idx = it->second.at(j);
|
|
if (! _paths[idx].p || ! _paths[idx].eligible || ! _paths[idx].allowed() || _paths[idx].isSpare()) {
|
|
continue;
|
|
}
|
|
addPathToBond(idx, updatedBondedPathCount);
|
|
++updatedBondedPathCount;
|
|
debug("add %s (no user addr preference)", pathToStr(_paths[idx].p).c_str());
|
|
}
|
|
}
|
|
// If the user prefers to only use one address type (IPv4 or IPv6)
|
|
if (ipvPref == 4 || ipvPref == 6) {
|
|
for (int j = 0; j < it->second.size(); j++) {
|
|
int idx = it->second.at(j);
|
|
if (! _paths[idx].p || ! _paths[idx].eligible || _paths[idx].isSpare()) {
|
|
continue;
|
|
}
|
|
if (! _paths[idx].allowed()) {
|
|
debug("did not add %s (user addr preference %d)", pathToStr(_paths[idx].p).c_str(), ipvPref);
|
|
continue;
|
|
}
|
|
addPathToBond(idx, updatedBondedPathCount);
|
|
++updatedBondedPathCount;
|
|
debug("add path %s (user addr preference %d)", pathToStr(_paths[idx].p).c_str(), ipvPref);
|
|
}
|
|
}
|
|
// If the users prefers one address type to another, try to find at least
|
|
// one path of that type before considering others.
|
|
if (ipvPref == 46 || ipvPref == 64) {
|
|
bool foundPreferredPath = false;
|
|
// Search for preferred paths
|
|
for (int j = 0; j < it->second.size(); j++) {
|
|
int idx = it->second.at(j);
|
|
if (! _paths[idx].p || ! _paths[idx].eligible || ! _paths[idx].allowed() || _paths[idx].isSpare()) {
|
|
continue;
|
|
}
|
|
if (_paths[idx].preferred()) {
|
|
addPathToBond(idx, updatedBondedPathCount);
|
|
++updatedBondedPathCount;
|
|
debug("add %s (user addr preference %d)", pathToStr(_paths[idx].p).c_str(), ipvPref);
|
|
foundPreferredPath = true;
|
|
}
|
|
}
|
|
// Unable to find a path that matches user preference, settle for another address type
|
|
if (! foundPreferredPath) {
|
|
debug("did not find first-choice path type on link %s (user preference %d)", link->ifname().c_str(), ipvPref);
|
|
for (int j = 0; j < it->second.size(); j++) {
|
|
int idx = it->second.at(j);
|
|
if (! _paths[idx].p || ! _paths[idx].eligible || _paths[idx].isSpare()) {
|
|
continue;
|
|
}
|
|
addPathToBond(idx, updatedBondedPathCount);
|
|
++updatedBondedPathCount;
|
|
debug("add %s (user addr preference %d)", pathToStr(_paths[idx].p).c_str(), ipvPref);
|
|
foundPreferredPath = true;
|
|
}
|
|
}
|
|
}
|
|
++it; // Next link
|
|
}
|
|
_numBondedPaths = updatedBondedPathCount;
|
|
if (_policy == ZT_BOND_POLICY_BALANCE_RR) {
|
|
// Cause a RR reset since the current index might no longer be valid
|
|
_rrPacketsSentOnCurrLink = _packetsPerLink;
|
|
_rrIdx = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::estimatePathQuality(int64_t now)
|
|
{
|
|
float lat[ZT_MAX_PEER_NETWORK_PATHS] = { 0 };
|
|
float pdv[ZT_MAX_PEER_NETWORK_PATHS] = { 0 };
|
|
float plr[ZT_MAX_PEER_NETWORK_PATHS] = { 0 };
|
|
float per[ZT_MAX_PEER_NETWORK_PATHS] = { 0 };
|
|
|
|
float maxLAT = 0;
|
|
float maxPDV = 0;
|
|
float maxPLR = 0;
|
|
float maxPER = 0;
|
|
|
|
float absoluteQuality[ZT_MAX_PEER_NETWORK_PATHS] = { 0 };
|
|
|
|
float totQuality = 0.0f;
|
|
|
|
// Process observation samples, compute summary statistics, and compute relative link qualities
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p || ! _paths[i].allowed()) {
|
|
continue;
|
|
}
|
|
// Drain unacknowledged QoS records
|
|
int qosRecordTimeout = (_qosSendInterval * 3);
|
|
std::map<uint64_t, uint64_t>::iterator it = _paths[i].qosStatsOut.begin();
|
|
int numDroppedQosOutRecords = 0;
|
|
while (it != _paths[i].qosStatsOut.end()) {
|
|
if ((now - it->second) >= qosRecordTimeout) {
|
|
it = _paths[i].qosStatsOut.erase(it);
|
|
++numDroppedQosOutRecords;
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
if (numDroppedQosOutRecords) {
|
|
// debug("dropped %d QOS out-records", numDroppedQosOutRecords);
|
|
}
|
|
|
|
/*
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p) {
|
|
continue;
|
|
}
|
|
// if ((now - _paths[i].lastAckReceived) > ackSendInterval) {
|
|
// debug("been a while since ACK");
|
|
// if (_paths[i].unackedBytes > 0) {
|
|
// _paths[i].unackedBytes / _paths[i].bytesSen
|
|
// }
|
|
// }
|
|
}
|
|
*/
|
|
|
|
it = _paths[i].qosStatsIn.begin();
|
|
int numDroppedQosInRecords = 0;
|
|
while (it != _paths[i].qosStatsIn.end()) {
|
|
if ((now - it->second) >= qosRecordTimeout) {
|
|
it = _paths[i].qosStatsIn.erase(it);
|
|
++numDroppedQosInRecords;
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
if (numDroppedQosInRecords) {
|
|
// debug("dropped %d QOS in-records", numDroppedQosInRecords);
|
|
}
|
|
|
|
absoluteQuality[i] = 0;
|
|
totQuality = 0;
|
|
// Normalize raw observations according to sane limits and/or user specified values
|
|
lat[i] = 1.0 / expf(4 * Utils::normalize(_paths[i].latency, 0, _qw[ZT_QOS_LAT_MAX_IDX], 0, 1));
|
|
pdv[i] = 1.0 / expf(4 * Utils::normalize(_paths[i].latencyVariance, 0, _qw[ZT_QOS_PDV_MAX_IDX], 0, 1));
|
|
plr[i] = 1.0 / expf(4 * Utils::normalize(_paths[i].packetLossRatio, 0, _qw[ZT_QOS_PLR_MAX_IDX], 0, 1));
|
|
per[i] = 1.0 / expf(4 * Utils::normalize(_paths[i].packetErrorRatio, 0, _qw[ZT_QOS_PER_MAX_IDX], 0, 1));
|
|
// Record bond-wide maximums to determine relative values
|
|
maxLAT = lat[i] > maxLAT ? lat[i] : maxLAT;
|
|
maxPDV = pdv[i] > maxPDV ? pdv[i] : maxPDV;
|
|
maxPLR = plr[i] > maxPLR ? plr[i] : maxPLR;
|
|
maxPER = per[i] > maxPER ? per[i] : maxPER;
|
|
}
|
|
|
|
// Compute relative user-specified link capacities (may change during life of Bond)
|
|
int maxObservedLinkCap = 0;
|
|
// Find current maximum
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].allowed()) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (link) {
|
|
int linkSpeed = link->capacity();
|
|
_paths[i].p->_givenLinkSpeed = linkSpeed;
|
|
_paths[i].p->_mtu = link->mtu();
|
|
maxObservedLinkCap = linkSpeed > maxObservedLinkCap ? linkSpeed : maxObservedLinkCap;
|
|
}
|
|
}
|
|
}
|
|
// Compute relative link capacity (Used for weighting traffic allocations)
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].allowed()) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (link) {
|
|
float relativeCapacity = (link->capacity() / (float)maxObservedLinkCap);
|
|
link->setRelativeCapacity(relativeCapacity);
|
|
_paths[i].relativeLinkCapacity = relativeCapacity;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Convert metrics to relative quantities and apply contribution weights
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].bonded) {
|
|
absoluteQuality[i] += ((maxLAT > 0.0f ? lat[i] / maxLAT : 0.0f) * _qw[ZT_QOS_LAT_WEIGHT_IDX]);
|
|
absoluteQuality[i] += ((maxPDV > 0.0f ? pdv[i] / maxPDV : 0.0f) * _qw[ZT_QOS_PDV_WEIGHT_IDX]);
|
|
absoluteQuality[i] += ((maxPLR > 0.0f ? plr[i] / maxPLR : 0.0f) * _qw[ZT_QOS_PLR_WEIGHT_IDX]);
|
|
absoluteQuality[i] += ((maxPER > 0.0f ? per[i] / maxPER : 0.0f) * _qw[ZT_QOS_PER_WEIGHT_IDX]);
|
|
absoluteQuality[i] *= _paths[i].relativeLinkCapacity;
|
|
totQuality += absoluteQuality[i];
|
|
}
|
|
}
|
|
|
|
// Compute quality of link relative to all others in the bond (also accounting for stated link capacity)
|
|
if (totQuality > 0.0) {
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].bonded) {
|
|
_paths[i].relativeQuality = absoluteQuality[i] / totQuality;
|
|
// debug("[%2d], abs=%f, tot=%f, rel=%f, relcap=%f", i, absoluteQuality[i], totQuality, _paths[i].relativeQuality, _paths[i].relativeLinkCapacity);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Compute summary statistics
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p || ! _paths[i].allowed()) {
|
|
continue;
|
|
}
|
|
// Compute/Smooth average of real-world observations
|
|
if (_paths[i].latencySamples.count() == ZT_QOS_SHORTTERM_SAMPLE_WIN_SIZE) {
|
|
_paths[i].latency = _paths[i].latencySamples.mean();
|
|
}
|
|
if (_paths[i].latencySamples.count() == ZT_QOS_SHORTTERM_SAMPLE_WIN_SIZE) {
|
|
_paths[i].latencyVariance = _paths[i].latencySamples.stddev();
|
|
}
|
|
|
|
// Write values to external path object so that it can be propagated to the user
|
|
_paths[i].p->_latencyMean = _paths[i].latency;
|
|
_paths[i].p->_latencyVariance = _paths[i].latencyVariance;
|
|
_paths[i].p->_packetLossRatio = _paths[i].packetLossRatio;
|
|
_paths[i].p->_packetErrorRatio = _paths[i].packetErrorRatio;
|
|
_paths[i].p->_bonded = _paths[i].bonded;
|
|
_paths[i].p->_eligible = _paths[i].eligible;
|
|
//_paths[i].packetErrorRatio = 1.0 - (_paths[i].packetValiditySamples.count() ? _paths[i].packetValiditySamples.mean() : 1.0);
|
|
// _valid is written elsewhere
|
|
_paths[i].p->_relativeQuality = _paths[i].relativeQuality;
|
|
}
|
|
|
|
// Flag links for avoidance
|
|
for (unsigned int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p || ! _paths[i].allowed()) {
|
|
continue;
|
|
}
|
|
bool shouldAvoid = false;
|
|
if (! _paths[i].shouldAvoid) {
|
|
if (_paths[i].latency > _qw[ZT_QOS_LAT_MAX_IDX]) {
|
|
log("avoiding link %s because (lat %6.4f > %6.4f)", pathToStr(_paths[i].p).c_str(), _paths[i].latency, _qw[ZT_QOS_LAT_MAX_IDX]);
|
|
shouldAvoid = true;
|
|
}
|
|
if (_paths[i].latencyVariance > _qw[ZT_QOS_PDV_MAX_IDX]) {
|
|
log("avoiding link %s because (pdv %6.4f > %6.4f)", pathToStr(_paths[i].p).c_str(), _paths[i].latencyVariance, _qw[ZT_QOS_PDV_MAX_IDX]);
|
|
shouldAvoid = true;
|
|
}
|
|
if (_paths[i].packetErrorRatio > _qw[ZT_QOS_PER_MAX_IDX]) {
|
|
log("avoiding link %s because (per %6.4f > %6.4f)", pathToStr(_paths[i].p).c_str(), _paths[i].packetErrorRatio, _qw[ZT_QOS_PER_MAX_IDX]);
|
|
shouldAvoid = true;
|
|
}
|
|
if (_paths[i].packetLossRatio > _qw[ZT_QOS_PLR_MAX_IDX]) {
|
|
log("avoiding link %s because (plr %6.4f > %6.4f)", pathToStr(_paths[i].p).c_str(), _paths[i].packetLossRatio, _qw[ZT_QOS_PLR_MAX_IDX]);
|
|
shouldAvoid = true;
|
|
}
|
|
_paths[i].shouldAvoid = shouldAvoid;
|
|
} else {
|
|
if (! shouldAvoid) {
|
|
log("no longer avoiding link %s", pathToStr(_paths[i].p).c_str());
|
|
_paths[i].shouldAvoid = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::processBalanceTasks(int64_t now)
|
|
{
|
|
if (! _numBondedPaths) {
|
|
return;
|
|
}
|
|
/**
|
|
* Clean up and reset flows if necessary
|
|
*/
|
|
if ((now - _lastFlowExpirationCheck) > ZT_PEER_PATH_EXPIRATION) {
|
|
Mutex::Lock _l(_flows_m);
|
|
forgetFlowsWhenNecessary(ZT_PEER_PATH_EXPIRATION, false, now);
|
|
std::map<int16_t, SharedPtr<Flow> >::iterator it = _flows.begin();
|
|
while (it != _flows.end()) {
|
|
it->second->resetByteCounts();
|
|
++it;
|
|
}
|
|
_lastFlowExpirationCheck = now;
|
|
}
|
|
/**
|
|
* Move (all) flows from dead paths
|
|
*/
|
|
if (_policy == ZT_BOND_POLICY_BALANCE_XOR || _policy == ZT_BOND_POLICY_BALANCE_AWARE) {
|
|
Mutex::Lock _l(_flows_m);
|
|
std::map<int16_t, SharedPtr<Flow> >::iterator flow_it = _flows.begin();
|
|
while (flow_it != _flows.end()) {
|
|
if (_paths[flow_it->second->assignedPath].p) {
|
|
int originalPathIdx = flow_it->second->assignedPath;
|
|
if (! _paths[originalPathIdx].eligible) {
|
|
log("moving all flows from dead link %s", pathToStr(_paths[originalPathIdx].p).c_str());
|
|
if (assignFlowToBondedPath(flow_it->second, now, true)) {
|
|
_paths[originalPathIdx].assignedFlowCount--;
|
|
}
|
|
}
|
|
}
|
|
++flow_it;
|
|
}
|
|
}
|
|
/**
|
|
* Move (some) flows from low quality paths
|
|
*/
|
|
if (_policy == ZT_BOND_POLICY_BALANCE_AWARE) {
|
|
Mutex::Lock _l(_flows_m);
|
|
std::map<int16_t, SharedPtr<Flow> >::iterator flow_it = _flows.begin();
|
|
while (flow_it != _flows.end()) {
|
|
if (_paths[flow_it->second->assignedPath].p) {
|
|
int originalPathIdx = flow_it->second->assignedPath;
|
|
if (_paths[originalPathIdx].shouldAvoid) {
|
|
if (assignFlowToBondedPath(flow_it->second, now, true)) {
|
|
_paths[originalPathIdx].assignedFlowCount--;
|
|
return; // Only move one flow at a time
|
|
}
|
|
}
|
|
}
|
|
++flow_it;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::dequeueNextActiveBackupPath(uint64_t now)
|
|
{
|
|
if (_abFailoverQueue.empty()) {
|
|
return;
|
|
}
|
|
_abPathIdx = _abFailoverQueue.front();
|
|
_abFailoverQueue.pop_front();
|
|
_lastActiveBackupPathChange = now;
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p) {
|
|
_paths[i].resetPacketCounts();
|
|
}
|
|
}
|
|
}
|
|
|
|
bool Bond::abForciblyRotateLink()
|
|
{
|
|
Mutex::Lock _l(_paths_m);
|
|
if (_policy == ZT_BOND_POLICY_ACTIVE_BACKUP) {
|
|
int prevPathIdx = _abPathIdx;
|
|
dequeueNextActiveBackupPath(RR->node->now());
|
|
log("active link rotated from %s to %s", pathToStr(_paths[prevPathIdx].p).c_str(), pathToStr(_paths[_abPathIdx].p).c_str());
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void Bond::processActiveBackupTasks(void* tPtr, int64_t now)
|
|
{
|
|
int prevActiveBackupPathIdx = _abPathIdx;
|
|
int nonPreferredPathIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
bool bFoundPrimaryLink = false;
|
|
|
|
if (_abPathIdx != ZT_MAX_PEER_NETWORK_PATHS && ! _paths[_abPathIdx].p) {
|
|
_abPathIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
log("main active-backup path has been removed");
|
|
}
|
|
|
|
/**
|
|
* Generate periodic status report
|
|
*/
|
|
if ((now - _lastBondStatusLog) > ZT_BOND_STATUS_INTERVAL) {
|
|
_lastBondStatusLog = now;
|
|
if (_abPathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
|
|
log("no active link");
|
|
} else if (_paths[_abPathIdx].p) {
|
|
log("active link is %s, failover queue size is %zu", pathToStr(_paths[_abPathIdx].p).c_str(), _abFailoverQueue.size());
|
|
}
|
|
if (_abFailoverQueue.empty()) {
|
|
log("failover queue is empty, bond is no longer fault-tolerant");
|
|
}
|
|
}
|
|
/**
|
|
* Select initial "active" active-backup link
|
|
*/
|
|
if (_abPathIdx == ZT_MAX_PEER_NETWORK_PATHS) {
|
|
/**
|
|
* [Automatic mode]
|
|
* The user has not explicitly specified links or their failover schedule,
|
|
* the bonding policy will now select the first eligible path and set it as
|
|
* its active backup path, if a substantially better path is detected the bonding
|
|
* policy will assign it as the new active backup path. If the path fails it will
|
|
* simply find the next eligible path.
|
|
*/
|
|
if (! userHasSpecifiedLinks()) {
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].eligible) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (link) {
|
|
log("found eligible link %s", pathToStr(_paths[i].p).c_str());
|
|
_abPathIdx = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* [Manual mode]
|
|
* The user has specified links or failover rules that the bonding policy should adhere to.
|
|
*/
|
|
else if (userHasSpecifiedLinks()) {
|
|
if (userHasSpecifiedPrimaryLink()) {
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p) {
|
|
continue;
|
|
}
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (link) {
|
|
if (_paths[i].eligible && link->primary()) {
|
|
if (! _paths[i].preferred()) {
|
|
// Found path on primary link, take note in case we don't find a preferred path
|
|
nonPreferredPathIdx = i;
|
|
bFoundPrimaryLink = true;
|
|
}
|
|
if (_paths[i].preferred()) {
|
|
_abPathIdx = i;
|
|
bFoundPrimaryLink = true;
|
|
if (_paths[_abPathIdx].p) {
|
|
SharedPtr<Link> abLink = RR->bc->getLinkBySocket(_policyAlias, _paths[_abPathIdx].p->localSocket());
|
|
if (abLink) {
|
|
log("found preferred primary link %s", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
}
|
|
break; // Found preferred path on primary link
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (bFoundPrimaryLink && (nonPreferredPathIdx != ZT_MAX_PEER_NETWORK_PATHS)) {
|
|
log("found non-preferred primary link");
|
|
_abPathIdx = nonPreferredPathIdx;
|
|
}
|
|
}
|
|
|
|
else if (! userHasSpecifiedPrimaryLink()) {
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p && _paths[i].eligible) {
|
|
_abPathIdx = i;
|
|
break;
|
|
}
|
|
}
|
|
if (_abPathIdx != ZT_MAX_PEER_NETWORK_PATHS) {
|
|
if (_paths[_abPathIdx].p) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[_abPathIdx].p->localSocket());
|
|
if (link) {
|
|
log("select non-primary link %s", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Short-circuit if we don't have an active link yet. Everything below is optimization from the base case
|
|
if (_abPathIdx < 0 || _abPathIdx == ZT_MAX_PEER_NETWORK_PATHS || (! _paths[_abPathIdx].p)) {
|
|
return;
|
|
}
|
|
|
|
// Remove ineligible paths from the failover link queue
|
|
for (std::deque<int>::iterator it(_abFailoverQueue.begin()); it != _abFailoverQueue.end();) {
|
|
if (! _paths[(*it)].p) {
|
|
log("link is no longer valid, removing from failover queue (%zu links remain in queue)", _abFailoverQueue.size());
|
|
it = _abFailoverQueue.erase(it);
|
|
continue;
|
|
}
|
|
if (_paths[(*it)].p && ! _paths[(*it)].eligible) {
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[(*it)].p->localSocket());
|
|
it = _abFailoverQueue.erase(it);
|
|
if (link) {
|
|
log("link %s is ineligible, removing from failover queue (%zu links remain in queue)", pathToStr(_paths[_abPathIdx].p).c_str(), _abFailoverQueue.size());
|
|
}
|
|
continue;
|
|
} else {
|
|
++it;
|
|
}
|
|
}
|
|
/**
|
|
* Failover instructions were provided by user, build queue according those as well as IPv
|
|
* preference, disregarding performance.
|
|
*/
|
|
if (userHasSpecifiedFailoverInstructions()) {
|
|
/**
|
|
* Clear failover scores
|
|
*/
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p) {
|
|
_paths[i].failoverScore = 0;
|
|
}
|
|
}
|
|
// Follow user-specified failover instructions
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p || ! _paths[i].allowed() || ! _paths[i].eligible) {
|
|
continue;
|
|
}
|
|
SharedPtr<Link> link = RR->bc->getLinkBySocket(_policyAlias, _paths[i].p->localSocket());
|
|
if (! link) {
|
|
continue;
|
|
}
|
|
int failoverScoreHandicap = _paths[i].failoverScore;
|
|
if (_paths[i].preferred()) {
|
|
failoverScoreHandicap += ZT_BOND_FAILOVER_HANDICAP_PREFERRED;
|
|
}
|
|
if (link->primary()) {
|
|
// If using "optimize" primary re-select mode, ignore user link designations
|
|
failoverScoreHandicap += ZT_BOND_FAILOVER_HANDICAP_PRIMARY;
|
|
}
|
|
if (! _paths[i].failoverScore) {
|
|
// If we didn't inherit a failover score from a "parent" that wants to use this path as a failover
|
|
int newHandicap = failoverScoreHandicap ? failoverScoreHandicap : (_paths[i].relativeQuality * 255.0);
|
|
_paths[i].failoverScore = newHandicap;
|
|
}
|
|
SharedPtr<Link> failoverLink;
|
|
if (link->failoverToLink().length()) {
|
|
failoverLink = RR->bc->getLinkByName(_policyAlias, link->failoverToLink());
|
|
}
|
|
if (failoverLink) {
|
|
for (int j = 0; j < ZT_MAX_PEER_NETWORK_PATHS; j++) {
|
|
if (_paths[j].p && getLink(_paths[j].p) == failoverLink.ptr()) {
|
|
int inheritedHandicap = failoverScoreHandicap - 10;
|
|
int newHandicap = _paths[j].failoverScore > inheritedHandicap ? _paths[j].failoverScore : inheritedHandicap;
|
|
if (! _paths[j].preferred()) {
|
|
newHandicap--;
|
|
}
|
|
_paths[j].failoverScore = newHandicap;
|
|
}
|
|
}
|
|
}
|
|
if (_paths[i].p) {
|
|
if (_paths[i].p.ptr() != _paths[_abPathIdx].p.ptr()) {
|
|
bool bFoundPathInQueue = false;
|
|
for (std::deque<int>::iterator it(_abFailoverQueue.begin()); it != _abFailoverQueue.end(); ++it) {
|
|
if (_paths[(*it)].p && (_paths[i].p.ptr() == _paths[(*it)].p.ptr())) {
|
|
bFoundPathInQueue = true;
|
|
}
|
|
}
|
|
if (! bFoundPathInQueue) {
|
|
_abFailoverQueue.push_front(i);
|
|
log("add link %s to failover queue (%zu links in queue)", pathToStr(_paths[i].p).c_str(), _abFailoverQueue.size());
|
|
addPathToBond(0, i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/**
|
|
* No failover instructions provided by user, build queue according to performance
|
|
* and IPv preference.
|
|
*/
|
|
else if (! userHasSpecifiedFailoverInstructions()) {
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (! _paths[i].p || ! _paths[i].allowed() || ! _paths[i].eligible) {
|
|
continue;
|
|
}
|
|
int failoverScoreHandicap = 0;
|
|
if (_paths[i].preferred()) {
|
|
failoverScoreHandicap = ZT_BOND_FAILOVER_HANDICAP_PREFERRED;
|
|
}
|
|
if (! _paths[i].eligible) {
|
|
failoverScoreHandicap = -10000;
|
|
}
|
|
SharedPtr<Link> link = getLink(_paths[i].p);
|
|
if (! link) {
|
|
continue;
|
|
}
|
|
if (link->primary() && _abLinkSelectMethod != ZT_BOND_RESELECTION_POLICY_OPTIMIZE) {
|
|
// If using "optimize" primary re-select mode, ignore user link designations
|
|
failoverScoreHandicap = ZT_BOND_FAILOVER_HANDICAP_PRIMARY;
|
|
}
|
|
/*
|
|
if (_paths[i].p.ptr() == _paths[_negotiatedPathIdx].p.ptr()) {
|
|
_paths[i].negotiated = true;
|
|
failoverScoreHandicap = ZT_BOND_FAILOVER_HANDICAP_NEGOTIATED;
|
|
}
|
|
else {
|
|
_paths[i].negotiated = false;
|
|
}
|
|
*/
|
|
_paths[i].failoverScore = _paths[i].relativeQuality + failoverScoreHandicap;
|
|
if (_paths[i].p.ptr() != _paths[_abPathIdx].p.ptr()) {
|
|
bool bFoundPathInQueue = false;
|
|
for (std::deque<int>::iterator it(_abFailoverQueue.begin()); it != _abFailoverQueue.end(); ++it) {
|
|
if (_paths[i].p.ptr() == _paths[(*it)].p.ptr()) {
|
|
bFoundPathInQueue = true;
|
|
}
|
|
}
|
|
if (! bFoundPathInQueue) {
|
|
_abFailoverQueue.push_front(i);
|
|
log("add link %s to failover queue (%zu links in queue)", pathToStr(_paths[i].p).c_str(), _abFailoverQueue.size());
|
|
addPathToBond(0, i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Sort queue based on performance
|
|
if (! _abFailoverQueue.empty()) {
|
|
for (int i = 0; i < _abFailoverQueue.size(); i++) {
|
|
int value_to_insert = _abFailoverQueue[i];
|
|
int hole_position = i;
|
|
while (hole_position > 0 && (_abFailoverQueue[hole_position - 1] > value_to_insert)) {
|
|
_abFailoverQueue[hole_position] = _abFailoverQueue[hole_position - 1];
|
|
hole_position = hole_position - 1;
|
|
}
|
|
_abFailoverQueue[hole_position] = value_to_insert;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Short-circuit if we have no queued paths
|
|
*/
|
|
if (_abFailoverQueue.empty()) {
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Fulfill primary re-select obligations
|
|
*/
|
|
if (! _paths[_abPathIdx].eligible) { // Implicit ZT_BOND_RESELECTION_POLICY_FAILURE
|
|
log("link %s has failed, select link from failover queue (%zu links in queue)", pathToStr(_paths[_abPathIdx].p).c_str(), _abFailoverQueue.size());
|
|
if (! _abFailoverQueue.empty()) {
|
|
dequeueNextActiveBackupPath(now);
|
|
log("active link switched to %s", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
} else {
|
|
log("failover queue is empty, no links to choose from");
|
|
}
|
|
}
|
|
/**
|
|
* Detect change to prevent flopping during later optimization step.
|
|
*/
|
|
if (prevActiveBackupPathIdx != _abPathIdx) {
|
|
_lastActiveBackupPathChange = now;
|
|
}
|
|
if (_abFailoverQueue.empty()) {
|
|
return; // No sense in continuing since there are no links to switch to
|
|
}
|
|
|
|
if (_abLinkSelectMethod == ZT_BOND_RESELECTION_POLICY_ALWAYS) {
|
|
SharedPtr<Link> abLink = getLink(_paths[_abPathIdx].p);
|
|
if (! _paths[_abFailoverQueue.front()].p) {
|
|
log("invalid link. not switching");
|
|
return;
|
|
}
|
|
|
|
SharedPtr<Link> abFailoverLink = getLink(_paths[_abFailoverQueue.front()].p);
|
|
if (abLink && ! abLink->primary() && _paths[_abFailoverQueue.front()].p && abFailoverLink && abFailoverLink->primary()) {
|
|
dequeueNextActiveBackupPath(now);
|
|
log("switch back to available primary link %s (select mode: always)", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
}
|
|
}
|
|
if (_abLinkSelectMethod == ZT_BOND_RESELECTION_POLICY_BETTER) {
|
|
SharedPtr<Link> abLink = getLink(_paths[_abPathIdx].p);
|
|
if (abLink && ! abLink->primary()) {
|
|
// Active backup has switched to "better" primary link according to re-select policy.
|
|
SharedPtr<Link> abFailoverLink = getLink(_paths[_abFailoverQueue.front()].p);
|
|
if (_paths[_abFailoverQueue.front()].p && abFailoverLink && abFailoverLink->primary() && (_paths[_abFailoverQueue.front()].failoverScore > _paths[_abPathIdx].failoverScore)) {
|
|
dequeueNextActiveBackupPath(now);
|
|
log("switch back to user-defined primary link %s (select mode: better)", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
}
|
|
}
|
|
}
|
|
if (_abLinkSelectMethod == ZT_BOND_RESELECTION_POLICY_OPTIMIZE && ! _abFailoverQueue.empty()) {
|
|
/**
|
|
* Implement link negotiation that was previously-decided
|
|
*/
|
|
if (_paths[_abFailoverQueue.front()].negotiated) {
|
|
dequeueNextActiveBackupPath(now);
|
|
_lastPathNegotiationCheck = now;
|
|
log("switch negotiated link %s (select mode: optimize)", pathToStr(_paths[_abPathIdx].p).c_str());
|
|
} else {
|
|
// Try to find a better path and automatically switch to it -- not too often, though.
|
|
if ((now - _lastActiveBackupPathChange) > ZT_BOND_OPTIMIZE_INTERVAL) {
|
|
if (! _abFailoverQueue.empty()) {
|
|
int newFScore = _paths[_abFailoverQueue.front()].failoverScore;
|
|
int prevFScore = _paths[_abPathIdx].failoverScore;
|
|
// Establish a minimum switch threshold to prevent flapping
|
|
int failoverScoreDifference = _paths[_abFailoverQueue.front()].failoverScore - _paths[_abPathIdx].failoverScore;
|
|
int thresholdQuantity = (int)(ZT_BOND_ACTIVE_BACKUP_OPTIMIZE_MIN_THRESHOLD * (float)_paths[_abPathIdx].relativeQuality);
|
|
if ((failoverScoreDifference > 0) && (failoverScoreDifference > thresholdQuantity)) {
|
|
SharedPtr<Path> oldPath = _paths[_abPathIdx].p;
|
|
dequeueNextActiveBackupPath(now);
|
|
log("switch from %s (score: %d) to better link %s (score: %d) (select mode: optimize)", pathToStr(oldPath).c_str(), prevFScore, pathToStr(_paths[_abPathIdx].p).c_str(), newFScore);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Bond::initTimers()
|
|
{
|
|
_lastFlowExpirationCheck = 0;
|
|
_lastFlowRebalance = 0;
|
|
_lastSentPathNegotiationRequest = 0;
|
|
_lastPathNegotiationCheck = 0;
|
|
_lastPathNegotiationReceived = 0;
|
|
_lastQoSRateCheck = 0;
|
|
_lastAckRateCheck = 0;
|
|
_lastQualityEstimation = 0;
|
|
_lastBondStatusLog = 0;
|
|
_lastSummaryDump = 0;
|
|
_lastActiveBackupPathChange = 0;
|
|
_lastFrame = 0;
|
|
_lastBackgroundTaskCheck = 0;
|
|
}
|
|
|
|
void Bond::setBondParameters(int policy, SharedPtr<Bond> templateBond, bool useTemplate)
|
|
{
|
|
// Sanity check for policy
|
|
|
|
_defaultPolicy = (_defaultPolicy <= ZT_BOND_POLICY_NONE || _defaultPolicy > ZT_BOND_POLICY_BALANCE_AWARE) ? ZT_BOND_POLICY_NONE : _defaultPolicy;
|
|
_policy = (policy <= ZT_BOND_POLICY_NONE || policy > ZT_BOND_POLICY_BALANCE_AWARE) ? _defaultPolicy : policy;
|
|
|
|
// Check if non-leaf to prevent spamming infrastructure
|
|
ZT_PeerRole role;
|
|
if (_peer) {
|
|
role = RR->topology->role(_peer->address());
|
|
}
|
|
_isLeaf = _peer ? (role != ZT_PEER_ROLE_PLANET && role != ZT_PEER_ROLE_MOON) : false;
|
|
|
|
// Path negotiation
|
|
|
|
_allowPathNegotiation = false;
|
|
_pathNegotiationCutoffCount = 0;
|
|
_localUtility = 0;
|
|
_negotiatedPathIdx = 0;
|
|
|
|
// User preferences which may override the default bonding algorithm's behavior
|
|
|
|
_userHasSpecifiedPrimaryLink = false;
|
|
_userHasSpecifiedFailoverInstructions = false;
|
|
_userHasSpecifiedLinkCapacities = 0;
|
|
|
|
// Bond status
|
|
|
|
_numAliveLinks = 0;
|
|
_numTotalLinks = 0;
|
|
_numBondedPaths = 0;
|
|
|
|
// General parameters
|
|
|
|
_downDelay = 0;
|
|
_upDelay = 0;
|
|
_monitorInterval = 0;
|
|
|
|
// balance-aware
|
|
|
|
_totalBondUnderload = 0;
|
|
_overheadBytes = 0;
|
|
|
|
/**
|
|
* Policy defaults
|
|
*/
|
|
_abPathIdx = ZT_MAX_PEER_NETWORK_PATHS;
|
|
_abLinkSelectMethod = ZT_BOND_RESELECTION_POLICY_OPTIMIZE;
|
|
_rrPacketsSentOnCurrLink = 0;
|
|
_rrIdx = 0;
|
|
_packetsPerLink = 64;
|
|
|
|
// Sane quality defaults
|
|
|
|
_qw[ZT_QOS_LAT_MAX_IDX] = 500.0f;
|
|
_qw[ZT_QOS_PDV_MAX_IDX] = 100.0f;
|
|
_qw[ZT_QOS_PLR_MAX_IDX] = 0.001f;
|
|
_qw[ZT_QOS_PER_MAX_IDX] = 0.0001f;
|
|
_qw[ZT_QOS_LAT_WEIGHT_IDX] = 0.25f;
|
|
_qw[ZT_QOS_PDV_WEIGHT_IDX] = 0.25f;
|
|
_qw[ZT_QOS_PLR_WEIGHT_IDX] = 0.25f;
|
|
_qw[ZT_QOS_PER_WEIGHT_IDX] = 0.25f;
|
|
|
|
_failoverInterval = ZT_BOND_FAILOVER_DEFAULT_INTERVAL;
|
|
|
|
/* If a user has specified custom parameters for this bonding policy, overlay them onto the defaults */
|
|
if (useTemplate) {
|
|
_policyAlias = templateBond->_policyAlias;
|
|
_policy = templateBond->policy();
|
|
_failoverInterval = templateBond->_failoverInterval >= ZT_BOND_FAILOVER_MIN_INTERVAL ? templateBond->_failoverInterval : ZT_BOND_FAILOVER_MIN_INTERVAL;
|
|
_downDelay = templateBond->_downDelay;
|
|
_upDelay = templateBond->_upDelay;
|
|
_abLinkSelectMethod = templateBond->_abLinkSelectMethod;
|
|
memcpy(_qw, templateBond->_qw, ZT_QOS_PARAMETER_SIZE * sizeof(float));
|
|
debug("user link quality spec = {%6.3f, %6.3f, %6.3f, %6.3f, %6.3f, %6.3f, %6.3f, %6.3f}", _qw[0], _qw[1], _qw[2], _qw[3], _qw[4], _qw[5], _qw[6], _qw[7]);
|
|
}
|
|
|
|
if (! _isLeaf) {
|
|
_policy = ZT_BOND_POLICY_ACTIVE_BACKUP;
|
|
}
|
|
|
|
// Timer geometry
|
|
|
|
_monitorInterval = _failoverInterval / ZT_BOND_ECHOS_PER_FAILOVER_INTERVAL;
|
|
_qualityEstimationInterval = _failoverInterval * 2;
|
|
_qosSendInterval = _failoverInterval * 2;
|
|
_ackSendInterval = _failoverInterval * 2;
|
|
_qosCutoffCount = 0;
|
|
_ackCutoffCount = 0;
|
|
_defaultPathRefractoryPeriod = 8000;
|
|
}
|
|
|
|
void Bond::setUserLinkQualitySpec(float weights[], int len)
|
|
{
|
|
if (len != ZT_QOS_PARAMETER_SIZE) {
|
|
debug("link quality spec has an invalid number of parameters (%d out of %d), ignoring", len, ZT_QOS_PARAMETER_SIZE);
|
|
return;
|
|
}
|
|
float weightTotal = 0.0;
|
|
for (unsigned int i = 4; i < ZT_QOS_PARAMETER_SIZE; ++i) {
|
|
weightTotal += weights[i];
|
|
}
|
|
if (weightTotal > 0.99 && weightTotal < 1.01) {
|
|
memcpy(_qw, weights, len * sizeof(float));
|
|
}
|
|
}
|
|
|
|
SharedPtr<Link> Bond::getLink(const SharedPtr<Path>& path)
|
|
{
|
|
return ! path ? SharedPtr<Link>() : RR->bc->getLinkBySocket(_policyAlias, path->localSocket());
|
|
}
|
|
|
|
std::string Bond::pathToStr(const SharedPtr<Path>& path)
|
|
{
|
|
#ifdef ZT_TRACE
|
|
if (path) {
|
|
char pathStr[64] = { 0 };
|
|
char fullPathStr[384] = { 0 };
|
|
path->address().toString(pathStr);
|
|
SharedPtr<Link> link = getLink(path);
|
|
if (link) {
|
|
std::string ifnameStr = std::string(link->ifname());
|
|
snprintf(fullPathStr, 384, "%.16" PRIx64 "-%s/%s", path->localSocket(), ifnameStr.c_str(), pathStr);
|
|
return std::string(fullPathStr);
|
|
}
|
|
}
|
|
return "";
|
|
#else
|
|
return "";
|
|
#endif
|
|
}
|
|
|
|
void Bond::dumpPathStatus(int64_t now, int pathIdx)
|
|
{
|
|
#ifdef ZT_TRACE
|
|
std::string aliveOrDead = _paths[pathIdx].alive ? std::string("alive") : std::string("dead");
|
|
std::string eligibleOrNot = _paths[pathIdx].eligible ? std::string("eligible") : std::string("ineligible");
|
|
std::string bondedOrNot = _paths[pathIdx].bonded ? std::string("bonded") : std::string("unbonded");
|
|
log("path[%2u] --- %5s (in %7" PRId64 ", out: %7" PRId64 "), %10s, %8s, flows=%-6u lat=%-8.3f pdv=%-7.3f err=%-6.4f loss=%-6.4f qual=%-6.4f --- (%s) spare=%d",
|
|
pathIdx,
|
|
aliveOrDead.c_str(),
|
|
_paths[pathIdx].p->age(now),
|
|
_paths[pathIdx].p->_lastOut == 0 ? static_cast<int64_t>(0) : now - _paths[pathIdx].p->_lastOut,
|
|
eligibleOrNot.c_str(),
|
|
bondedOrNot.c_str(),
|
|
_paths[pathIdx].assignedFlowCount,
|
|
_paths[pathIdx].latency,
|
|
_paths[pathIdx].latencyVariance,
|
|
_paths[pathIdx].packetErrorRatio,
|
|
_paths[pathIdx].packetLossRatio,
|
|
_paths[pathIdx].relativeQuality,
|
|
pathToStr(_paths[pathIdx].p).c_str(),
|
|
_paths[pathIdx].isSpare());
|
|
#endif
|
|
}
|
|
|
|
void Bond::dumpInfo(int64_t now, bool force)
|
|
{
|
|
#ifdef ZT_TRACE
|
|
uint64_t timeSinceLastDump = now - _lastSummaryDump;
|
|
if (! force && timeSinceLastDump < ZT_BOND_STATUS_INTERVAL) {
|
|
return;
|
|
}
|
|
_lastSummaryDump = now;
|
|
float overhead = (_overheadBytes / (timeSinceLastDump / 1000.0f) / 1000.0f);
|
|
_overheadBytes = 0;
|
|
log("bond: bp=%d, fi=%" PRIu64 ", mi=%d, ud=%d, dd=%d, flows=%zu, leaf=%d, overhead=%f KB/s, links=(%d/%d)",
|
|
_policy,
|
|
_failoverInterval,
|
|
_monitorInterval,
|
|
_upDelay,
|
|
_downDelay,
|
|
_flows.size(),
|
|
_isLeaf,
|
|
overhead,
|
|
_numAliveLinks,
|
|
_numTotalLinks);
|
|
for (int i = 0; i < ZT_MAX_PEER_NETWORK_PATHS; ++i) {
|
|
if (_paths[i].p) {
|
|
dumpPathStatus(now, i);
|
|
}
|
|
}
|
|
log("");
|
|
#endif
|
|
}
|
|
|
|
} // namespace ZeroTier
|