mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2025-04-26 08:57:26 +02:00
120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
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* Copyright (c)2013-2020 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: 2024-01-01
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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 "Constants.hpp"
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#include "SelfAwareness.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Topology.hpp"
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#include "Peer.hpp"
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#include "Trace.hpp"
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#include <cstdlib>
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#include <cstring>
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#include <set>
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// Entry timeout -- make it fairly long since this is just to prevent stale buildup
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#define ZT_SELFAWARENESS_ENTRY_TIMEOUT 300000
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namespace ZeroTier {
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class _ResetWithinScope
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{
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public:
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ZT_INLINE _ResetWithinScope(void *tPtr,int64_t now,int inetAddressFamily,InetAddress::IpScope scope) :
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_now(now),
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_tPtr(tPtr),
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_family(inetAddressFamily),
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_scope(scope) {}
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ZT_INLINE void operator()(const SharedPtr<Peer> &p) { p->resetWithinScope(_tPtr,_scope,_family,_now); }
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private:
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int64_t _now;
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void *_tPtr;
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int _family;
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InetAddress::IpScope _scope;
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};
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SelfAwareness::SelfAwareness(const RuntimeEnvironment *renv) :
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RR(renv)
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{
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}
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void SelfAwareness::iam(void *tPtr,const Identity &reporter,const int64_t receivedOnLocalSocket,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,int64_t now)
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{
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const InetAddress::IpScope scope = myPhysicalAddress.ipScope();
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if ((scope != reporterPhysicalAddress.ipScope())||(scope == InetAddress::IP_SCOPE_NONE)||(scope == InetAddress::IP_SCOPE_LOOPBACK)||(scope == InetAddress::IP_SCOPE_MULTICAST))
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return;
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Mutex::Lock l(_phy_l);
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PhySurfaceEntry &entry = _phy[PhySurfaceKey(reporter.address(),receivedOnLocalSocket,reporterPhysicalAddress,scope)];
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if ( (trusted) && ((now - entry.ts) < ZT_SELFAWARENESS_ENTRY_TIMEOUT) && (!entry.mySurface.ipsEqual(myPhysicalAddress)) ) {
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// Changes to external surface reported by trusted peers causes path reset in this scope
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entry.mySurface = myPhysicalAddress;
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entry.ts = now;
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entry.trusted = trusted;
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// Erase all entries in this scope that were not reported from this remote address to prevent 'thrashing'
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// due to multiple reports of endpoint change.
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// Don't use 'entry' after this since hash table gets modified.
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for(Map<PhySurfaceKey,PhySurfaceEntry>::iterator i(_phy.begin());i!=_phy.end();) {
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if ((i->first.scope == scope)&&(i->first.reporterPhysicalAddress != reporterPhysicalAddress))
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_phy.erase(i++);
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else ++i;
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}
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// Reset all paths within this scope and address family
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_ResetWithinScope rset(tPtr,now,myPhysicalAddress.family(),(InetAddress::IpScope)scope);
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RR->topology->eachPeer<_ResetWithinScope &>(rset);
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RR->t->resettingPathsInScope(tPtr,0x9afff100,reporter,reporterPhysicalAddress,entry.mySurface,myPhysicalAddress,scope);
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} else {
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// Otherwise just update DB to use to determine external surface info
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entry.mySurface = myPhysicalAddress;
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entry.ts = now;
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entry.trusted = trusted;
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}
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}
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void SelfAwareness::clean(int64_t now)
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{
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Mutex::Lock l(_phy_l);
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for(Map<PhySurfaceKey,PhySurfaceEntry>::iterator i(_phy.begin());i!=_phy.end();) {
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if ((now - i->second.ts) >= ZT_SELFAWARENESS_ENTRY_TIMEOUT)
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_phy.erase(i++);
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else ++i;
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}
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}
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std::multimap<unsigned long,InetAddress> SelfAwareness::externalAddresses(const int64_t now) const
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{
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std::multimap<unsigned long,InetAddress> r;
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Map<InetAddress,unsigned long> counts;
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{
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Mutex::Lock l(_phy_l);
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for(Map<PhySurfaceKey,PhySurfaceEntry>::const_iterator i(_phy.begin());i!=_phy.end();++i) {
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if ((now - i->second.ts) < ZT_SELFAWARENESS_ENTRY_TIMEOUT)
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++counts[i->second.mySurface];
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}
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}
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for(Map<InetAddress,unsigned long>::iterator i(counts.begin());i!=counts.end();++i)
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r.insert(std::pair<unsigned long,InetAddress>(i->second,i->first));
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return r;
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}
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} // namespace ZeroTier
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