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@@ -37,6 +37,8 @@
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#include <algorithm>
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+#define ZT_PEER_PATH_SORT_INTERVAL 5000
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+
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namespace ZeroTier {
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// Used to send varying values for NAT keepalive
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@@ -51,17 +53,38 @@ Peer::Peer(const Identity &myIdentity,const Identity &peerIdentity)
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_lastAnnouncedTo(0),
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_lastPathConfirmationSent(0),
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_lastDirectPathPush(0),
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+ _lastPathSort(0),
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_vMajor(0),
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_vMinor(0),
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_vRevision(0),
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_id(peerIdentity),
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_numPaths(0),
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- _latency(0)
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+ _latency(0),
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+ _networkComs(4),
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+ _lastPushedComs(4)
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{
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if (!myIdentity.agree(peerIdentity,_key,ZT_PEER_SECRET_KEY_LENGTH))
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throw std::runtime_error("new peer identity key agreement failed");
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}
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+struct _SortPathsByQuality
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+{
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+ uint64_t _now;
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+ _SortPathsByQuality(const uint64_t now) : _now(now) {}
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+ inline bool operator()(const RemotePath &a,const RemotePath &b) const
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+ {
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+ const uint64_t qa = (
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+ ((uint64_t)a.active(_now) << 63) |
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+ (((uint64_t)(a.preferenceRank() & 0xfff)) << 51) |
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+ ((uint64_t)a.lastReceived() & 0x7ffffffffffffULL) );
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+ const uint64_t qb = (
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+ ((uint64_t)b.active(_now) << 63) |
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+ (((uint64_t)(b.preferenceRank() & 0xfff)) << 51) |
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+ ((uint64_t)b.lastReceived() & 0x7ffffffffffffULL) );
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+ return (qb < qa); // invert sense to sort in descending order
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+ }
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+};
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+
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void Peer::received(
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const RuntimeEnvironment *RR,
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const InetAddress &localAddr,
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@@ -73,6 +96,8 @@ void Peer::received(
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Packet::Verb inReVerb)
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{
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const uint64_t now = RR->node->now();
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+ Mutex::Lock _l(_lock);
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+
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_lastReceive = now;
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if (!hops) {
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@@ -91,6 +116,7 @@ void Peer::received(
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if (!pathIsConfirmed) {
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if ((verb == Packet::VERB_OK)&&(inReVerb == Packet::VERB_HELLO)) {
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+
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// Learn paths if they've been confirmed via a HELLO
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RemotePath *slot = (RemotePath *)0;
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if (np < ZT_MAX_PEER_NETWORK_PATHS) {
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@@ -111,8 +137,11 @@ void Peer::received(
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slot->received(now);
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_numPaths = np;
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pathIsConfirmed = true;
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+ _sortPaths(now);
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}
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+
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} else {
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+
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/* If this path is not known, send a HELLO. We don't learn
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* paths without confirming that a bidirectional link is in
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* fact present, but any packet that decodes and authenticates
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@@ -122,6 +151,7 @@ void Peer::received(
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TRACE("got %s via unknown path %s(%s), confirming...",Packet::verbString(verb),_id.address().toString().c_str(),remoteAddr.toString().c_str());
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attemptToContactAt(RR,localAddr,remoteAddr,now);
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}
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+
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}
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}
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}
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@@ -129,6 +159,7 @@ void Peer::received(
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/* Announce multicast groups of interest to direct peers if they are
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* considered authorized members of a given network. Also announce to
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* root servers and network controllers. */
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+ /*
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if ((pathIsConfirmed)&&((now - _lastAnnouncedTo) >= ((ZT_MULTICAST_LIKE_EXPIRE / 2) - 1000))) {
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_lastAnnouncedTo = now;
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@@ -158,6 +189,7 @@ void Peer::received(
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RR->node->putPacket(localAddr,remoteAddr,outp.data(),outp.size());
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}
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}
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+ */
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}
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if ((verb == Packet::VERB_FRAME)||(verb == Packet::VERB_EXT_FRAME))
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@@ -166,23 +198,10 @@ void Peer::received(
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_lastMulticastFrame = now;
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}
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-RemotePath *Peer::getBestPath(uint64_t now)
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-{
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- RemotePath *bestPath = (RemotePath *)0;
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- uint64_t lrMax = 0;
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- int rank = 0;
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- for(unsigned int p=0,np=_numPaths;p<np;++p) {
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- if ( (_paths[p].active(now)) && ((_paths[p].lastReceived() >= lrMax)||(_paths[p].preferenceRank() >= rank)) ) {
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- lrMax = _paths[p].lastReceived();
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- rank = _paths[p].preferenceRank();
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- bestPath = &(_paths[p]);
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- }
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- }
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- return bestPath;
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-}
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-
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void Peer::attemptToContactAt(const RuntimeEnvironment *RR,const InetAddress &localAddr,const InetAddress &atAddress,uint64_t now)
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{
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+ // _lock not required here since _id is immutable and nothing else is accessed
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+
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Packet outp(_id.address(),RR->identity.address(),Packet::VERB_HELLO);
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outp.append((unsigned char)ZT_PROTO_VERSION);
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outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR);
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@@ -214,7 +233,8 @@ void Peer::attemptToContactAt(const RuntimeEnvironment *RR,const InetAddress &lo
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void Peer::doPingAndKeepalive(const RuntimeEnvironment *RR,uint64_t now)
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{
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- RemotePath *const bestPath = getBestPath(now);
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+ Mutex::Lock _l(_lock);
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+ RemotePath *const bestPath = _getBestPath(now);
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if (bestPath) {
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if ((now - bestPath->lastReceived()) >= ZT_PEER_DIRECT_PING_DELAY) {
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TRACE("PING %s(%s)",_id.address().toString().c_str(),bestPath->address().toString().c_str());
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@@ -231,6 +251,8 @@ void Peer::doPingAndKeepalive(const RuntimeEnvironment *RR,uint64_t now)
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void Peer::pushDirectPaths(const RuntimeEnvironment *RR,RemotePath *path,uint64_t now,bool force)
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{
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+ Mutex::Lock _l(_lock);
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+
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if (((now - _lastDirectPathPush) >= ZT_DIRECT_PATH_PUSH_INTERVAL)||(force)) {
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_lastDirectPathPush = now;
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@@ -299,13 +321,16 @@ void Peer::pushDirectPaths(const RuntimeEnvironment *RR,RemotePath *path,uint64_
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}
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}
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-void Peer::addPath(const RemotePath &newp)
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+void Peer::addPath(const RemotePath &newp,uint64_t now)
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{
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+ Mutex::Lock _l(_lock);
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+
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unsigned int np = _numPaths;
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for(unsigned int p=0;p<np;++p) {
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if (_paths[p].address() == newp.address()) {
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_paths[p].setFixed(newp.fixed());
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+ _sortPaths(now);
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return;
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}
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}
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@@ -328,6 +353,8 @@ void Peer::addPath(const RemotePath &newp)
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*slot = newp;
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_numPaths = np;
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}
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+
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+ _sortPaths(now);
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}
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void Peer::clearPaths(bool fixedToo)
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@@ -349,6 +376,7 @@ void Peer::clearPaths(bool fixedToo)
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bool Peer::resetWithinScope(const RuntimeEnvironment *RR,InetAddress::IpScope scope,uint64_t now)
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{
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+ Mutex::Lock _l(_lock);
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unsigned int np = _numPaths;
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unsigned int x = 0;
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unsigned int y = 0;
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@@ -364,11 +392,13 @@ bool Peer::resetWithinScope(const RuntimeEnvironment *RR,InetAddress::IpScope sc
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++x;
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}
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_numPaths = y;
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+ _sortPaths(now);
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return (y < np);
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}
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void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const
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{
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+ Mutex::Lock _l(_lock);
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uint64_t bestV4 = 0,bestV6 = 0;
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for(unsigned int p=0,np=_numPaths;p<np;++p) {
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if (_paths[p].active(now)) {
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@@ -390,4 +420,137 @@ void Peer::getBestActiveAddresses(uint64_t now,InetAddress &v4,InetAddress &v6)
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}
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}
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+bool Peer::networkMembershipCertificatesAgree(uint64_t nwid,const CertificateOfMembership &com) const
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+{
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+ Mutex::Lock _l(_lock);
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+ const _NetworkCom *ourCom = _networkComs.get(nwid);
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+ if (ourCom)
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+ return ourCom->com.agreesWith(com);
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+ return false;
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+}
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+
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+bool Peer::validateAndSetNetworkMembershipCertificate(const RuntimeEnvironment *RR,uint64_t nwid,const CertificateOfMembership &com)
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+{
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+ // Sanity checks
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+ if ((!com)||(com.issuedTo() != _id.address()))
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+ return false;
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+
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+ // Return true if we already have this *exact* COM
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+ {
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+ Mutex::Lock _l(_lock);
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+ _NetworkCom *ourCom = _networkComs.get(nwid);
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+ if ((ourCom)&&(ourCom->com == com))
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+ return true;
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+ }
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+
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+ // Check signature, log and return if cert is invalid
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+ if (com.signedBy() != Network::controllerFor(nwid)) {
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+ TRACE("rejected network membership certificate for %.16llx signed by %s: signer not a controller of this network",(unsigned long long)_id,cert.signedBy().toString().c_str());
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+ return false; // invalid signer
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+ }
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+
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+ if (com.signedBy() == RR->identity.address()) {
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+
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+ // We are the controller: RR->identity.address() == controller() == cert.signedBy()
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+ // So, verify that we signed th cert ourself
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+ if (!com.verify(RR->identity)) {
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+ TRACE("rejected network membership certificate for %.16llx self signed by %s: signature check failed",(unsigned long long)_id,cert.signedBy().toString().c_str());
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+ return false; // invalid signature
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+ }
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+
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+ } else {
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+
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+ SharedPtr<Peer> signer(RR->topology->getPeer(com.signedBy()));
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+
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+ if (!signer) {
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+ // This would be rather odd, since this is our controller... could happen
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+ // if we get packets before we've gotten config.
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+ RR->sw->requestWhois(com.signedBy());
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+ return false; // signer unknown
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+ }
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+
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+ if (!com.verify(signer->identity())) {
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+ TRACE("rejected network membership certificate for %.16llx signed by %s: signature check failed",(unsigned long long)_id,cert.signedBy().toString().c_str());
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+ return false; // invalid signature
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+ }
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+ }
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+
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+ // If we made it past all those checks, add or update cert in our cert info store
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+ {
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+ Mutex::Lock _l(_lock);
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+ _networkComs.set(nwid,_NetworkCom(RR->node->now(),com));
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+ }
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+
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+ return true;
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+}
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+
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+bool Peer::needsOurNetworkMembershipCertificate(uint64_t nwid,uint64_t now,bool updateLastPushedTime)
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+{
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+ Mutex::Lock _l(_lock);
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+ uint64_t &lastPushed = _lastPushedComs[nwid];
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+ const uint64_t tmp = lastPushed;
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+ if (updateLastPushedTime)
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+ lastPushed = now;
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+ return ((now - tmp) < (ZT_NETWORK_AUTOCONF_DELAY / 2));
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+}
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+
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+void Peer::clean(const RuntimeEnvironment *RR,uint64_t now)
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+{
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+ Mutex::Lock _l(_lock);
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+
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+ {
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+ unsigned int np = _numPaths;
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+ unsigned int x = 0;
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+ unsigned int y = 0;
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+ while (x < np) {
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+ if (_paths[x].active(now))
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+ _paths[y++] = _paths[x];
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+ ++x;
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+ }
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+ _numPaths = y;
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+ }
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+
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+ {
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+ uint64_t *k = (uint64_t *)0;
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+ _NetworkCom *v = (_NetworkCom *)0;
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+ Hashtable< uint64_t,_NetworkCom >::Iterator i(_networkComs);
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+ while (i.next(k,v)) {
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+ if ( (!RR->node->belongsToNetwork(*k)) && ((now - v->ts) >= ZT_PEER_NETWORK_COM_EXPIRATION) )
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+ _networkComs.erase(*k);
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+ }
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+ }
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+
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+ {
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+ uint64_t *k = (uint64_t *)0;
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+ uint64_t *v = (uint64_t *)0;
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+ Hashtable< uint64_t,uint64_t >::Iterator i(_lastPushedComs);
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+ while (i.next(k,v)) {
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+ if ((now - *v) > (ZT_NETWORK_AUTOCONF_DELAY * 2))
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+ _lastPushedComs.erase(*k);
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+ }
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+ }
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+}
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+
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+void Peer::_sortPaths(const uint64_t now)
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+{
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+ // assumes _lock is locked
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+ _lastPathSort = now;
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+ std::sort(&(_paths[0]),&(_paths[_numPaths]),_SortPathsByQuality(now));
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+}
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+
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+RemotePath *Peer::_getBestPath(const uint64_t now)
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+{
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+ // assumes _lock is locked
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+ if ((now - _lastPathSort) >= ZT_PEER_PATH_SORT_INTERVAL)
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+ _sortPaths(now);
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+ if (_paths[0].active(now)) {
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+ return &(_paths[0]);
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+ } else {
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+ _sortPaths(now);
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+ if (_paths[0].active(now))
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+ return &(_paths[0]);
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+ }
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+ return (RemotePath *)0;
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+}
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+
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} // namespace ZeroTier
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Adam Ierymenko