mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-21 05:53:09 +00:00
115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
/*
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* Copyright (c)2019 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: 2023-01-01
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <set>
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#include <vector>
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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 "Node.hpp"
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#include "Topology.hpp"
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#include "Packet.hpp"
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#include "Peer.hpp"
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#include "Switch.hpp"
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#include "Trace.hpp"
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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 600000
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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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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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inline void operator()(const SharedPtr<Peer> &p) { p->resetWithinScope(_tPtr,_scope,_family,_now); }
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private:
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uint64_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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_phy(128)
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{
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}
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void SelfAwareness::iam(void *tPtr,const Address &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_m);
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PhySurfaceEntry &entry = _phy[PhySurfaceKey(reporter,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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RR->t->resettingPathsInScope(tPtr,reporter,reporterPhysicalAddress,myPhysicalAddress,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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{
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Hashtable< PhySurfaceKey,PhySurfaceEntry >::Iterator i(_phy);
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PhySurfaceKey *k = (PhySurfaceKey *)0;
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PhySurfaceEntry *e = (PhySurfaceEntry *)0;
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while (i.next(k,e)) {
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if ((k->reporterPhysicalAddress != reporterPhysicalAddress)&&(k->scope == scope))
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_phy.erase(*k);
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}
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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.ss_family,(InetAddress::IpScope)scope);
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RR->topology->eachPeer<_ResetWithinScope &>(rset);
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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_m);
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Hashtable< PhySurfaceKey,PhySurfaceEntry >::Iterator i(_phy);
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PhySurfaceKey *k = (PhySurfaceKey *)0;
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PhySurfaceEntry *e = (PhySurfaceEntry *)0;
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while (i.next(k,e)) {
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if ((now - e->ts) >= ZT_SELFAWARENESS_ENTRY_TIMEOUT)
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_phy.erase(*k);
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}
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}
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} // namespace ZeroTier
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