/* * ZeroTier One - Network Virtualization Everywhere * Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/ * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * -- * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial closed-source software that incorporates or links * directly against ZeroTier software without disclosing the source code * of your own application. */ #include #include #include #include "../version.h" #include "../include/ZeroTierOne.h" #include "Constants.hpp" #include "RuntimeEnvironment.hpp" #include "IncomingPacket.hpp" #include "Topology.hpp" #include "Switch.hpp" #include "Peer.hpp" #include "NetworkController.hpp" #include "SelfAwareness.hpp" #include "Salsa20.hpp" #include "SHA512.hpp" #include "World.hpp" #include "Node.hpp" #include "CertificateOfMembership.hpp" #include "Capability.hpp" #include "Tag.hpp" #include "Revocation.hpp" #include "Trace.hpp" namespace ZeroTier { bool IncomingPacket::tryDecode(const RuntimeEnvironment *RR,void *tPtr) { const Address sourceAddress(source()); try { // Check for trusted paths or unencrypted HELLOs (HELLO is the only packet sent in the clear) const unsigned int c = cipher(); bool trusted = false; if (c == ZT_PROTO_CIPHER_SUITE__NO_CRYPTO_TRUSTED_PATH) { // If this is marked as a packet via a trusted path, check source address and path ID. // Obviously if no trusted paths are configured this always returns false and such // packets are dropped on the floor. const uint64_t tpid = trustedPathId(); if (RR->topology->shouldInboundPathBeTrusted(_path->address(),tpid)) { trusted = true; } else { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,packetId(),sourceAddress,hops(),"path not trusted"); return true; } } else if ((c == ZT_PROTO_CIPHER_SUITE__C25519_POLY1305_NONE)&&(verb() == Packet::VERB_HELLO)) { // Only HELLO is allowed in the clear, but will still have a MAC return _doHELLO(RR,tPtr,false); } const SharedPtr peer(RR->topology->getPeer(tPtr,sourceAddress)); if (peer) { if (!trusted) { if (!dearmor(peer->key())) { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,packetId(),sourceAddress,hops(),"invalid MAC"); return true; } } if (!uncompress()) { RR->t->incomingPacketInvalid(tPtr,_path,packetId(),sourceAddress,hops(),Packet::VERB_NOP,"LZ4 decompression failed"); return true; } const Packet::Verb v = verb(); switch(v) { //case Packet::VERB_NOP: default: // ignore unknown verbs, but if they pass auth check they are "received" peer->received(tPtr,_path,hops(),packetId(),v,0,Packet::VERB_NOP,false,0); return true; case Packet::VERB_HELLO: return _doHELLO(RR,tPtr,true); case Packet::VERB_ERROR: return _doERROR(RR,tPtr,peer); case Packet::VERB_OK: return _doOK(RR,tPtr,peer); case Packet::VERB_WHOIS: return _doWHOIS(RR,tPtr,peer); case Packet::VERB_RENDEZVOUS: return _doRENDEZVOUS(RR,tPtr,peer); case Packet::VERB_FRAME: return _doFRAME(RR,tPtr,peer); case Packet::VERB_EXT_FRAME: return _doEXT_FRAME(RR,tPtr,peer); case Packet::VERB_ECHO: return _doECHO(RR,tPtr,peer); case Packet::VERB_MULTICAST_LIKE: return _doMULTICAST_LIKE(RR,tPtr,peer); case Packet::VERB_NETWORK_CREDENTIALS: return _doNETWORK_CREDENTIALS(RR,tPtr,peer); case Packet::VERB_NETWORK_CONFIG_REQUEST: return _doNETWORK_CONFIG_REQUEST(RR,tPtr,peer); case Packet::VERB_NETWORK_CONFIG: return _doNETWORK_CONFIG(RR,tPtr,peer); case Packet::VERB_MULTICAST_GATHER: return _doMULTICAST_GATHER(RR,tPtr,peer); case Packet::VERB_MULTICAST_FRAME: return _doMULTICAST_FRAME(RR,tPtr,peer); case Packet::VERB_PUSH_DIRECT_PATHS: return _doPUSH_DIRECT_PATHS(RR,tPtr,peer); case Packet::VERB_USER_MESSAGE: return _doUSER_MESSAGE(RR,tPtr,peer); case Packet::VERB_REMOTE_TRACE: return _doREMOTE_TRACE(RR,tPtr,peer); } } else { RR->sw->requestWhois(tPtr,RR->node->now(),sourceAddress); return false; } } catch ( ... ) { RR->t->incomingPacketInvalid(tPtr,_path,packetId(),sourceAddress,hops(),verb(),"unexpected exception in tryDecode()"); return true; } } bool IncomingPacket::_doERROR(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_ERROR_IDX_IN_RE_VERB]; const uint64_t inRePacketId = at(ZT_PROTO_VERB_ERROR_IDX_IN_RE_PACKET_ID); const Packet::ErrorCode errorCode = (Packet::ErrorCode)(*this)[ZT_PROTO_VERB_ERROR_IDX_ERROR_CODE]; uint64_t networkId = 0; /* Security note: we do not gate doERROR() with expectingReplyTo() to * avoid having to log every outgoing packet ID. Instead we put the * logic to determine whether we should consider an ERROR in each * error handler. In most cases these are only trusted in specific * circumstances. */ switch(errorCode) { case Packet::ERROR_OBJ_NOT_FOUND: // Object not found, currently only meaningful from network controllers. if (inReVerb == Packet::VERB_NETWORK_CONFIG_REQUEST) { const SharedPtr network(RR->node->network(at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD))); if ((network)&&(network->controller() == peer->address())) network->setNotFound(); } break; case Packet::ERROR_UNSUPPORTED_OPERATION: // This can be sent in response to any operation, though right now we only // consider it meaningful from network controllers. This would indicate // that the queried node does not support acting as a controller. if (inReVerb == Packet::VERB_NETWORK_CONFIG_REQUEST) { const SharedPtr network(RR->node->network(at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD))); if ((network)&&(network->controller() == peer->address())) network->setNotFound(); } break; case Packet::ERROR_IDENTITY_COLLISION: // FIXME: for federation this will need a payload with a signature or something. if (RR->topology->isUpstream(peer->identity())) RR->node->postEvent(tPtr,ZT_EVENT_FATAL_ERROR_IDENTITY_COLLISION); break; case Packet::ERROR_NEED_MEMBERSHIP_CERTIFICATE: { // Peers can send this in response to frames if they do not have a recent enough COM from us networkId = at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD); const SharedPtr network(RR->node->network(networkId)); const int64_t now = RR->node->now(); if ( (network) && (network->config().com) && (peer->rateGateIncomingComRequest(now)) ) network->pushCredentialsNow(tPtr,peer->address(),now); } break; case Packet::ERROR_NETWORK_ACCESS_DENIED_: { // Network controller: network access denied. const SharedPtr network(RR->node->network(at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD))); if ((network)&&(network->controller() == peer->address())) network->setAccessDenied(); } break; case Packet::ERROR_UNWANTED_MULTICAST: { // Members of networks can use this error to indicate that they no longer // want to receive multicasts on a given channel. networkId = at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD); const SharedPtr network(RR->node->network(networkId)); if ((network)&&(network->gate(tPtr,peer))) { const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 8,6),6),at(ZT_PROTO_VERB_ERROR_IDX_PAYLOAD + 14)); RR->mc->remove(network->id(),mg,peer->address()); } } break; default: break; } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_ERROR,inRePacketId,inReVerb,false,networkId); return true; } bool IncomingPacket::_doHELLO(const RuntimeEnvironment *RR,void *tPtr,const bool alreadyAuthenticated) { const int64_t now = RR->node->now(); const uint64_t pid = packetId(); const Address fromAddress(source()); const unsigned int protoVersion = (*this)[ZT_PROTO_VERB_HELLO_IDX_PROTOCOL_VERSION]; const unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MAJOR_VERSION]; const unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MINOR_VERSION]; const unsigned int vRevision = at(ZT_PROTO_VERB_HELLO_IDX_REVISION); const int64_t timestamp = at(ZT_PROTO_VERB_HELLO_IDX_TIMESTAMP); Identity id; unsigned int ptr = ZT_PROTO_VERB_HELLO_IDX_IDENTITY + id.deserialize(*this,ZT_PROTO_VERB_HELLO_IDX_IDENTITY); if (protoVersion < ZT_PROTO_VERSION_MIN) { RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"protocol version too old"); return true; } if (fromAddress != id.address()) { RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"identity/address mismatch"); return true; } SharedPtr peer(RR->topology->getPeer(tPtr,id.address())); if (peer) { // We already have an identity with this address -- check for collisions if (!alreadyAuthenticated) { if (peer->identity() != id) { // Identity is different from the one we already have -- address collision // Check rate limits if (!RR->node->rateGateIdentityVerification(now,_path->address())) return true; uint8_t key[ZT_PEER_SECRET_KEY_LENGTH]; if (RR->identity.agree(id,key,ZT_PEER_SECRET_KEY_LENGTH)) { if (dearmor(key)) { // ensure packet is authentic, otherwise drop RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"address collision"); Packet outp(id.address(),RR->identity.address(),Packet::VERB_ERROR); outp.append((uint8_t)Packet::VERB_HELLO); outp.append((uint64_t)pid); outp.append((uint8_t)Packet::ERROR_IDENTITY_COLLISION); outp.armor(key,true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } else { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,pid,fromAddress,hops(),"invalid MAC"); } } else { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,pid,fromAddress,hops(),"invalid identity"); } return true; } else { // Identity is the same as the one we already have -- check packet integrity if (!dearmor(peer->key())) { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,pid,fromAddress,hops(),"invalid MAC"); return true; } // Continue at // VALID } } // else if alreadyAuthenticated then continue at // VALID } else { // We don't already have an identity with this address -- validate and learn it // Sanity check: this basically can't happen if (alreadyAuthenticated) { RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"illegal alreadyAuthenticated state"); return true; } // Check rate limits if (!RR->node->rateGateIdentityVerification(now,_path->address())) { RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"rate limit exceeded"); return true; } // Check packet integrity and MAC (this is faster than locallyValidate() so do it first to filter out total crap) SharedPtr newPeer(new Peer(RR,RR->identity,id)); if (!dearmor(newPeer->key())) { RR->t->incomingPacketMessageAuthenticationFailure(tPtr,_path,pid,fromAddress,hops(),"invalid MAC"); return true; } // Check that identity's address is valid as per the derivation function if (!id.locallyValidate()) { RR->t->incomingPacketDroppedHELLO(tPtr,_path,pid,fromAddress,"invalid identity"); return true; } peer = RR->topology->addPeer(tPtr,newPeer); // Continue at // VALID } // VALID -- if we made it here, packet passed identity and authenticity checks! // Get external surface address if present (was not in old versions) InetAddress externalSurfaceAddress; if (ptr < size()) { ptr += externalSurfaceAddress.deserialize(*this,ptr); if ((externalSurfaceAddress)&&(hops() == 0)) RR->sa->iam(tPtr,id.address(),_path->localSocket(),_path->address(),externalSurfaceAddress,RR->topology->isUpstream(id),now); } // Get primary planet world ID and world timestamp if present uint64_t planetWorldId = 0; uint64_t planetWorldTimestamp = 0; if ((ptr + 16) <= size()) { planetWorldId = at(ptr); ptr += 8; planetWorldTimestamp = at(ptr); ptr += 8; } std::vector< std::pair > moonIdsAndTimestamps; if (ptr < size()) { // Remainder of packet, if present, is encrypted cryptField(peer->key(),ptr,size() - ptr); // Get moon IDs and timestamps if present if ((ptr + 2) <= size()) { const unsigned int numMoons = at(ptr); ptr += 2; for(unsigned int i=0;i(at(ptr),at(ptr + 8))); ptr += 16; } } } // Send OK(HELLO) with an echo of the packet's timestamp and some of the same // information about us: version, sent-to address, etc. Packet outp(id.address(),RR->identity.address(),Packet::VERB_OK); outp.append((unsigned char)Packet::VERB_HELLO); outp.append((uint64_t)pid); outp.append((uint64_t)timestamp); outp.append((unsigned char)ZT_PROTO_VERSION); outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR); outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR); outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION); if (protoVersion >= 5) { _path->address().serialize(outp); } else { /* LEGACY COMPATIBILITY HACK: * * For a while now (since 1.0.3), ZeroTier has recognized changes in * its network environment empirically by examining its external network * address as reported by trusted peers. In versions prior to 1.1.0 * (protocol version < 5), they did this by saving a snapshot of this * information (in SelfAwareness.hpp) keyed by reporting device ID and * address type. * * This causes problems when clustering is combined with symmetric NAT. * Symmetric NAT remaps ports, so different endpoints in a cluster will * report back different exterior addresses. Since the old code keys * this by device ID and not sending physical address and compares the * entire address including port, it constantly thinks its external * surface is changing and resets connections when talking to a cluster. * * In new code we key by sending physical address and device and we also * take the more conservative position of only interpreting changes in * IP address (neglecting port) as a change in network topology that * necessitates a reset. But we can make older clients work here by * nulling out the port field. Since this info is only used for empirical * detection of link changes, it doesn't break anything else. */ InetAddress tmpa(_path->address()); tmpa.setPort(0); tmpa.serialize(outp); } const unsigned int worldUpdateSizeAt = outp.size(); outp.addSize(2); // make room for 16-bit size field if ((planetWorldId)&&(RR->topology->planetWorldTimestamp() > planetWorldTimestamp)&&(planetWorldId == RR->topology->planetWorldId())) { RR->topology->planet().serialize(outp,false); } if (moonIdsAndTimestamps.size() > 0) { std::vector moons(RR->topology->moons()); for(std::vector::const_iterator m(moons.begin());m!=moons.end();++m) { for(std::vector< std::pair >::const_iterator i(moonIdsAndTimestamps.begin());i!=moonIdsAndTimestamps.end();++i) { if (i->first == m->id()) { if (m->timestamp() > i->second) m->serialize(outp,false); break; } } } } outp.setAt(worldUpdateSizeAt,(uint16_t)(outp.size() - (worldUpdateSizeAt + 2))); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),now); peer->setRemoteVersion(protoVersion,vMajor,vMinor,vRevision); // important for this to go first so received() knows the version peer->received(tPtr,_path,hops(),pid,Packet::VERB_HELLO,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doOK(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB]; const uint64_t inRePacketId = at(ZT_PROTO_VERB_OK_IDX_IN_RE_PACKET_ID); uint64_t networkId = 0; if (!RR->node->expectingReplyTo(inRePacketId)) return true; switch(inReVerb) { case Packet::VERB_HELLO: { const uint64_t latency = RR->node->now() - at(ZT_PROTO_VERB_HELLO__OK__IDX_TIMESTAMP); if (latency > ZT_HELLO_MAX_ALLOWABLE_LATENCY) return true; const unsigned int vProto = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_PROTOCOL_VERSION]; const unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MAJOR_VERSION]; const unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MINOR_VERSION]; const unsigned int vRevision = at(ZT_PROTO_VERB_HELLO__OK__IDX_REVISION); if (vProto < ZT_PROTO_VERSION_MIN) return true; InetAddress externalSurfaceAddress; unsigned int ptr = ZT_PROTO_VERB_HELLO__OK__IDX_REVISION + 2; // Get reported external surface address if present if (ptr < size()) ptr += externalSurfaceAddress.deserialize(*this,ptr); // Handle planet or moon updates if present if ((ptr + 2) <= size()) { const unsigned int worldsLen = at(ptr); ptr += 2; if (RR->topology->shouldAcceptWorldUpdateFrom(peer->address())) { const unsigned int endOfWorlds = ptr + worldsLen; while (ptr < endOfWorlds) { World w; ptr += w.deserialize(*this,ptr); RR->topology->addWorld(tPtr,w,false); } } else { ptr += worldsLen; } } if (!hops()) _path->updateLatency((unsigned int)latency); peer->setRemoteVersion(vProto,vMajor,vMinor,vRevision); if ((externalSurfaceAddress)&&(hops() == 0)) RR->sa->iam(tPtr,peer->address(),_path->localSocket(),_path->address(),externalSurfaceAddress,RR->topology->isUpstream(peer->identity()),RR->node->now()); } break; case Packet::VERB_WHOIS: if (RR->topology->isUpstream(peer->identity())) { const Identity id(*this,ZT_PROTO_VERB_WHOIS__OK__IDX_IDENTITY); RR->sw->doAnythingWaitingForPeer(tPtr,RR->topology->addPeer(tPtr,SharedPtr(new Peer(RR,RR->identity,id)))); } break; case Packet::VERB_NETWORK_CONFIG_REQUEST: { networkId = at(ZT_PROTO_VERB_OK_IDX_PAYLOAD); const SharedPtr network(RR->node->network(networkId)); if (network) network->handleConfigChunk(tPtr,packetId(),source(),*this,ZT_PROTO_VERB_OK_IDX_PAYLOAD); } break; case Packet::VERB_MULTICAST_GATHER: { networkId = at(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_NETWORK_ID); const SharedPtr network(RR->node->network(networkId)); if (network) { const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_MAC,6),6),at(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_ADI)); const unsigned int count = at(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 4); RR->mc->addMultiple(tPtr,RR->node->now(),networkId,mg,field(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS + 6,count * 5),count,at(ZT_PROTO_VERB_MULTICAST_GATHER__OK__IDX_GATHER_RESULTS)); } } break; case Packet::VERB_MULTICAST_FRAME: { const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_FLAGS]; networkId = at(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_NETWORK_ID); const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_MAC,6),6),at(ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_ADI)); const SharedPtr network(RR->node->network(networkId)); if (network) { unsigned int offset = 0; if ((flags & 0x01) != 0) { // deprecated but still used by older peers CertificateOfMembership com; offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS); if (com) network->addCredential(tPtr,com); } if ((flags & 0x02) != 0) { // OK(MULTICAST_FRAME) includes implicit gather results offset += ZT_PROTO_VERB_MULTICAST_FRAME__OK__IDX_COM_AND_GATHER_RESULTS; unsigned int totalKnown = at(offset); offset += 4; unsigned int count = at(offset); offset += 2; RR->mc->addMultiple(tPtr,RR->node->now(),networkId,mg,field(offset,count * 5),count,totalKnown); } } } break; default: break; } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_OK,inRePacketId,inReVerb,false,networkId); return true; } bool IncomingPacket::_doWHOIS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { if ((!RR->topology->amUpstream())&&(!peer->rateGateInboundWhoisRequest(RR->node->now()))) return true; Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK); outp.append((unsigned char)Packet::VERB_WHOIS); outp.append(packetId()); unsigned int count = 0; unsigned int ptr = ZT_PACKET_IDX_PAYLOAD; while ((ptr + ZT_ADDRESS_LENGTH) <= size()) { const Address addr(field(ptr,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); ptr += ZT_ADDRESS_LENGTH; const Identity id(RR->topology->getIdentity(tPtr,addr)); if (id) { id.serialize(outp,false); ++count; } else { // Request unknown WHOIS from upstream from us (if we have one) RR->sw->requestWhois(tPtr,RR->node->now(),addr); } } if (count > 0) { outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_WHOIS,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doRENDEZVOUS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { if (RR->topology->isUpstream(peer->identity())) { const Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH); const SharedPtr rendezvousWith(RR->topology->getPeer(tPtr,with)); if (rendezvousWith) { const unsigned int port = at(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT); const unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN]; if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) { const InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port); if (RR->node->shouldUsePathForZeroTierTraffic(tPtr,with,_path->localSocket(),atAddr)) { const uint64_t junk = RR->node->prng(); RR->node->putPacket(tPtr,_path->localSocket(),atAddr,&junk,4,2); // send low-TTL junk packet to 'open' local NAT(s) and stateful firewalls rendezvousWith->attemptToContactAt(tPtr,_path->localSocket(),atAddr,RR->node->now(),false); } } } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_RENDEZVOUS,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doFRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const uint64_t nwid = at(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID); const SharedPtr network(RR->node->network(nwid)); bool trustEstablished = false; if (network) { if (network->gate(tPtr,peer)) { trustEstablished = true; if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) { const unsigned int etherType = at(ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE); const MAC sourceMac(peer->address(),nwid); const unsigned int frameLen = size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD; const uint8_t *const frameData = reinterpret_cast(data()) + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD; if (network->filterIncomingPacket(tPtr,peer,RR->identity.address(),sourceMac,network->mac(),frameData,frameLen,etherType,0) > 0) RR->node->putFrame(tPtr,nwid,network->userPtr(),sourceMac,network->mac(),etherType,0,(const void *)frameData,frameLen); } } else { _sendErrorNeedCredentials(RR,tPtr,peer,nwid); RR->t->incomingNetworkAccessDenied(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_FRAME,true); } } else { _sendErrorNeedCredentials(RR,tPtr,peer,nwid); } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_FRAME,0,Packet::VERB_NOP,trustEstablished,nwid); return true; } bool IncomingPacket::_doEXT_FRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const uint64_t nwid = at(ZT_PROTO_VERB_EXT_FRAME_IDX_NETWORK_ID); const SharedPtr network(RR->node->network(nwid)); if (network) { const unsigned int flags = (*this)[ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS]; unsigned int comLen = 0; if ((flags & 0x01) != 0) { // inline COM with EXT_FRAME is deprecated but still used with old peers CertificateOfMembership com; comLen = com.deserialize(*this,ZT_PROTO_VERB_EXT_FRAME_IDX_COM); if (com) network->addCredential(tPtr,com); } if (!network->gate(tPtr,peer)) { RR->t->incomingNetworkAccessDenied(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_EXT_FRAME,true); _sendErrorNeedCredentials(RR,tPtr,peer,nwid); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,false,nwid); return true; } if (size() > ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD) { const unsigned int etherType = at(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_ETHERTYPE); const MAC to(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_TO,ZT_PROTO_VERB_EXT_FRAME_LEN_TO),ZT_PROTO_VERB_EXT_FRAME_LEN_TO); const MAC from(field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_FROM,ZT_PROTO_VERB_EXT_FRAME_LEN_FROM),ZT_PROTO_VERB_EXT_FRAME_LEN_FROM); const unsigned int frameLen = size() - (comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD); const uint8_t *const frameData = (const uint8_t *)field(comLen + ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD,frameLen); if ((!from)||(from == network->mac())) { peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } switch (network->filterIncomingPacket(tPtr,peer,RR->identity.address(),from,to,frameData,frameLen,etherType,0)) { case 1: if (from != MAC(peer->address(),nwid)) { if (network->config().permitsBridging(peer->address())) { network->learnBridgeRoute(from,peer->address()); } else { RR->t->incomingNetworkFrameDropped(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_EXT_FRAME,from,to,"bridging not allowed (remote)"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } } else if (to != network->mac()) { if (to.isMulticast()) { if (network->config().multicastLimit == 0) { RR->t->incomingNetworkFrameDropped(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_EXT_FRAME,from,to,"multicast disabled"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } } else if (!network->config().permitsBridging(RR->identity.address())) { RR->t->incomingNetworkFrameDropped(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_EXT_FRAME,from,to,"bridging not allowed (local)"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } } // fall through -- 2 means accept regardless of bridging checks or other restrictions case 2: RR->node->putFrame(tPtr,nwid,network->userPtr(),from,to,etherType,0,(const void *)frameData,frameLen); break; } } if ((flags & 0x10) != 0) { // ACK requested Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK); outp.append((uint8_t)Packet::VERB_EXT_FRAME); outp.append((uint64_t)packetId()); outp.append((uint64_t)nwid); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,true,nwid); } else { peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_EXT_FRAME,0,Packet::VERB_NOP,false,nwid); } return true; } bool IncomingPacket::_doECHO(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { if (!peer->rateGateEchoRequest(RR->node->now())) return true; const uint64_t pid = packetId(); Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK); outp.append((unsigned char)Packet::VERB_ECHO); outp.append((uint64_t)pid); if (size() > ZT_PACKET_IDX_PAYLOAD) outp.append(reinterpret_cast(data()) + ZT_PACKET_IDX_PAYLOAD,size() - ZT_PACKET_IDX_PAYLOAD); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); peer->received(tPtr,_path,hops(),pid,Packet::VERB_ECHO,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doMULTICAST_LIKE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const int64_t now = RR->node->now(); uint64_t authOnNetwork[256]; // cache for approved network IDs unsigned int authOnNetworkCount = 0; SharedPtr network; bool trustEstablished = false; // Iterate through 18-byte network,MAC,ADI tuples for(unsigned int ptr=ZT_PACKET_IDX_PAYLOAD;ptr(ptr); bool auth = false; for(unsigned int i=0;iid() != nwid)) network = RR->node->network(nwid); const bool authOnNet = ((network)&&(network->gate(tPtr,peer))); if (!authOnNet) _sendErrorNeedCredentials(RR,tPtr,peer,nwid); trustEstablished |= authOnNet; if (authOnNet||RR->mc->cacheAuthorized(peer->address(),nwid,now)) { auth = true; if (authOnNetworkCount < 256) // sanity check, packets can't really be this big authOnNetwork[authOnNetworkCount++] = nwid; } } if (auth) { const MulticastGroup group(MAC(field(ptr + 8,6),6),at(ptr + 14)); RR->mc->add(tPtr,now,nwid,group,peer->address()); } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_LIKE,0,Packet::VERB_NOP,trustEstablished,(network) ? network->id() : 0); return true; } bool IncomingPacket::_doNETWORK_CREDENTIALS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { if (!peer->rateGateCredentialsReceived(RR->node->now())) return true; CertificateOfMembership com; Capability cap; Tag tag; Revocation revocation; CertificateOfOwnership coo; bool trustEstablished = false; SharedPtr network; unsigned int p = ZT_PACKET_IDX_PAYLOAD; while ((p < size())&&((*this)[p] != 0)) { p += com.deserialize(*this,p); if (com) { network = RR->node->network(com.networkId()); if (network) { switch (network->addCredential(tPtr,com)) { case Membership::ADD_REJECTED: break; case Membership::ADD_ACCEPTED_NEW: case Membership::ADD_ACCEPTED_REDUNDANT: trustEstablished = true; break; case Membership::ADD_DEFERRED_FOR_WHOIS: return false; } } else RR->mc->addCredential(tPtr,com,false); } } ++p; // skip trailing 0 after COMs if present if (p < size()) { // older ZeroTier versions do not send capabilities, tags, or revocations const unsigned int numCapabilities = at(p); p += 2; for(unsigned int i=0;iid() != cap.networkId())) network = RR->node->network(cap.networkId()); if (network) { switch (network->addCredential(tPtr,cap)) { case Membership::ADD_REJECTED: break; case Membership::ADD_ACCEPTED_NEW: case Membership::ADD_ACCEPTED_REDUNDANT: trustEstablished = true; break; case Membership::ADD_DEFERRED_FOR_WHOIS: return false; } } } if (p >= size()) return true; const unsigned int numTags = at(p); p += 2; for(unsigned int i=0;iid() != tag.networkId())) network = RR->node->network(tag.networkId()); if (network) { switch (network->addCredential(tPtr,tag)) { case Membership::ADD_REJECTED: break; case Membership::ADD_ACCEPTED_NEW: case Membership::ADD_ACCEPTED_REDUNDANT: trustEstablished = true; break; case Membership::ADD_DEFERRED_FOR_WHOIS: return false; } } } if (p >= size()) return true; const unsigned int numRevocations = at(p); p += 2; for(unsigned int i=0;iid() != revocation.networkId())) network = RR->node->network(revocation.networkId()); if (network) { switch(network->addCredential(tPtr,peer->address(),revocation)) { case Membership::ADD_REJECTED: break; case Membership::ADD_ACCEPTED_NEW: case Membership::ADD_ACCEPTED_REDUNDANT: trustEstablished = true; break; case Membership::ADD_DEFERRED_FOR_WHOIS: return false; } } } if (p >= size()) return true; const unsigned int numCoos = at(p); p += 2; for(unsigned int i=0;iid() != coo.networkId())) network = RR->node->network(coo.networkId()); if (network) { switch(network->addCredential(tPtr,coo)) { case Membership::ADD_REJECTED: break; case Membership::ADD_ACCEPTED_NEW: case Membership::ADD_ACCEPTED_REDUNDANT: trustEstablished = true; break; case Membership::ADD_DEFERRED_FOR_WHOIS: return false; } } } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_NETWORK_CREDENTIALS,0,Packet::VERB_NOP,trustEstablished,(network) ? network->id() : 0); return true; } bool IncomingPacket::_doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const uint64_t nwid = at(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_NETWORK_ID); const unsigned int hopCount = hops(); const uint64_t requestPacketId = packetId(); if (RR->localNetworkController) { const unsigned int metaDataLength = (ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT_LEN <= size()) ? at(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT_LEN) : 0; const char *metaDataBytes = (metaDataLength != 0) ? (const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT,metaDataLength) : (const char *)0; const Dictionary metaData(metaDataBytes,metaDataLength); RR->localNetworkController->request(nwid,(hopCount > 0) ? InetAddress() : _path->address(),requestPacketId,peer->identity(),metaData); } else { Packet outp(peer->address(),RR->identity.address(),Packet::VERB_ERROR); outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST); outp.append(requestPacketId); outp.append((unsigned char)Packet::ERROR_UNSUPPORTED_OPERATION); outp.append(nwid); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } peer->received(tPtr,_path,hopCount,requestPacketId,Packet::VERB_NETWORK_CONFIG_REQUEST,0,Packet::VERB_NOP,false,nwid); return true; } bool IncomingPacket::_doNETWORK_CONFIG(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const SharedPtr network(RR->node->network(at(ZT_PACKET_IDX_PAYLOAD))); if (network) { const uint64_t configUpdateId = network->handleConfigChunk(tPtr,packetId(),source(),*this,ZT_PACKET_IDX_PAYLOAD); if (configUpdateId) { Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK); outp.append((uint8_t)Packet::VERB_ECHO); outp.append((uint64_t)packetId()); outp.append((uint64_t)network->id()); outp.append((uint64_t)configUpdateId); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_NETWORK_CONFIG,0,Packet::VERB_NOP,false,(network) ? network->id() : 0); return true; } bool IncomingPacket::_doMULTICAST_GATHER(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const uint64_t nwid = at(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_NETWORK_ID); const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_GATHER_IDX_FLAGS]; const MulticastGroup mg(MAC(field(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_MAC,6),6),at(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_ADI)); const unsigned int gatherLimit = at(ZT_PROTO_VERB_MULTICAST_GATHER_IDX_GATHER_LIMIT); const SharedPtr network(RR->node->network(nwid)); if ((flags & 0x01) != 0) { try { CertificateOfMembership com; com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_GATHER_IDX_COM); if (com) { if (network) network->addCredential(tPtr,com); else RR->mc->addCredential(tPtr,com,false); } } catch ( ... ) {} // discard invalid COMs } const bool trustEstablished = ((network)&&(network->gate(tPtr,peer))); if (!trustEstablished) _sendErrorNeedCredentials(RR,tPtr,peer,nwid); if ( ( trustEstablished || RR->mc->cacheAuthorized(peer->address(),nwid,RR->node->now()) ) && (gatherLimit > 0) ) { Packet outp(peer->address(),RR->identity.address(),Packet::VERB_OK); outp.append((unsigned char)Packet::VERB_MULTICAST_GATHER); outp.append(packetId()); outp.append(nwid); mg.mac().appendTo(outp); outp.append((uint32_t)mg.adi()); const unsigned int gatheredLocally = RR->mc->gather(peer->address(),nwid,mg,outp,gatherLimit); if (gatheredLocally > 0) { outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_GATHER,0,Packet::VERB_NOP,trustEstablished,nwid); return true; } bool IncomingPacket::_doMULTICAST_FRAME(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const uint64_t nwid = at(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID); const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FLAGS]; const SharedPtr network(RR->node->network(nwid)); if (network) { // Offset -- size of optional fields added to position of later fields unsigned int offset = 0; if ((flags & 0x01) != 0) { // This is deprecated but may still be sent by old peers CertificateOfMembership com; offset += com.deserialize(*this,ZT_PROTO_VERB_MULTICAST_FRAME_IDX_COM); if (com) network->addCredential(tPtr,com); } if (!network->gate(tPtr,peer)) { RR->t->incomingNetworkAccessDenied(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_MULTICAST_FRAME,true); _sendErrorNeedCredentials(RR,tPtr,peer,nwid); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,false,nwid); return true; } unsigned int gatherLimit = 0; if ((flags & 0x02) != 0) { gatherLimit = at(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_GATHER_LIMIT); offset += 4; } MAC from; if ((flags & 0x04) != 0) { from.setTo(field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,6),6); offset += 6; } else { from.fromAddress(peer->address(),nwid); } const MulticastGroup to(MAC(field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_MAC,6),6),at(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_ADI)); const unsigned int etherType = at(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE); const unsigned int frameLen = size() - (offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME); if (network->config().multicastLimit == 0) { RR->t->incomingNetworkFrameDropped(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_MULTICAST_FRAME,from,to.mac(),"multicast disabled"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,false,nwid); return true; } if ((frameLen > 0)&&(frameLen <= ZT_MAX_MTU)) { if (!to.mac().isMulticast()) { RR->t->incomingPacketInvalid(tPtr,_path,packetId(),source(),hops(),Packet::VERB_MULTICAST_FRAME,"destination not multicast"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } if ((!from)||(from.isMulticast())||(from == network->mac())) { RR->t->incomingPacketInvalid(tPtr,_path,packetId(),source(),hops(),Packet::VERB_MULTICAST_FRAME,"invalid source MAC"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } const uint8_t *const frameData = (const uint8_t *)field(offset + ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME,frameLen); if ((flags & 0x08)&&(network->config().isMulticastReplicator(RR->identity.address()))) RR->mc->send(tPtr,RR->node->now(),network,peer->address(),to,from,etherType,frameData,frameLen); if (from != MAC(peer->address(),nwid)) { if (network->config().permitsBridging(peer->address())) { network->learnBridgeRoute(from,peer->address()); } else { RR->t->incomingNetworkFrameDropped(tPtr,network,_path,packetId(),size(),peer->address(),Packet::VERB_MULTICAST_FRAME,from,to.mac(),"bridging not allowed (remote)"); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,true,nwid); // trustEstablished because COM is okay return true; } } if (network->filterIncomingPacket(tPtr,peer,RR->identity.address(),from,to.mac(),frameData,frameLen,etherType,0) > 0) RR->node->putFrame(tPtr,nwid,network->userPtr(),from,to.mac(),etherType,0,(const void *)frameData,frameLen); } if (gatherLimit) { Packet outp(source(),RR->identity.address(),Packet::VERB_OK); outp.append((unsigned char)Packet::VERB_MULTICAST_FRAME); outp.append(packetId()); outp.append(nwid); to.mac().appendTo(outp); outp.append((uint32_t)to.adi()); outp.append((unsigned char)0x02); // flag 0x02 = contains gather results if (RR->mc->gather(peer->address(),nwid,to,outp,gatherLimit)) { outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),RR->node->now()); } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,true,nwid); } else { _sendErrorNeedCredentials(RR,tPtr,peer,nwid); peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_MULTICAST_FRAME,0,Packet::VERB_NOP,false,nwid); } return true; } bool IncomingPacket::_doPUSH_DIRECT_PATHS(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { const int64_t now = RR->node->now(); // First, subject this to a rate limit if (!peer->rateGatePushDirectPaths(now)) { peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_PUSH_DIRECT_PATHS,0,Packet::VERB_NOP,false,0); return true; } // Second, limit addresses by scope and type uint8_t countPerScope[ZT_INETADDRESS_MAX_SCOPE+1][2]; // [][0] is v4, [][1] is v6 memset(countPerScope,0,sizeof(countPerScope)); unsigned int count = at(ZT_PACKET_IDX_PAYLOAD); unsigned int ptr = ZT_PACKET_IDX_PAYLOAD + 2; while (count--) { // if ptr overflows Buffer will throw // TODO: some flags are not yet implemented unsigned int flags = (*this)[ptr++]; unsigned int extLen = at(ptr); ptr += 2; ptr += extLen; // unused right now unsigned int addrType = (*this)[ptr++]; unsigned int addrLen = (*this)[ptr++]; switch(addrType) { case 4: { const InetAddress a(field(ptr,4),4,at(ptr + 4)); if ( ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_FORGET_PATH) == 0) && // not being told to forget (!( ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT) == 0) && (peer->hasActivePathTo(now,a)) )) && // not already known (RR->node->shouldUsePathForZeroTierTraffic(tPtr,peer->address(),_path->localSocket(),a)) ) // should use path { if ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT) != 0) { peer->clusterRedirect(tPtr,_path,a,now); } else if (++countPerScope[(int)a.ipScope()][0] <= ZT_PUSH_DIRECT_PATHS_MAX_PER_SCOPE_AND_FAMILY) { peer->attemptToContactAt(tPtr,InetAddress(),a,now,false); } } } break; case 6: { const InetAddress a(field(ptr,16),16,at(ptr + 16)); if ( ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_FORGET_PATH) == 0) && // not being told to forget (!( ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT) == 0) && (peer->hasActivePathTo(now,a)) )) && // not already known (RR->node->shouldUsePathForZeroTierTraffic(tPtr,peer->address(),_path->localSocket(),a)) ) // should use path { if ((flags & ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT) != 0) { peer->clusterRedirect(tPtr,_path,a,now); } else if (++countPerScope[(int)a.ipScope()][1] <= ZT_PUSH_DIRECT_PATHS_MAX_PER_SCOPE_AND_FAMILY) { peer->attemptToContactAt(tPtr,InetAddress(),a,now,false); } } } break; } ptr += addrLen; } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_PUSH_DIRECT_PATHS,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doUSER_MESSAGE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { if (likely(size() >= (ZT_PACKET_IDX_PAYLOAD + 8))) { ZT_UserMessage um; um.origin = peer->address().toInt(); um.typeId = at(ZT_PACKET_IDX_PAYLOAD); um.data = reinterpret_cast(reinterpret_cast(data()) + ZT_PACKET_IDX_PAYLOAD + 8); um.length = size() - (ZT_PACKET_IDX_PAYLOAD + 8); RR->node->postEvent(tPtr,ZT_EVENT_USER_MESSAGE,reinterpret_cast(&um)); } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_USER_MESSAGE,0,Packet::VERB_NOP,false,0); return true; } bool IncomingPacket::_doREMOTE_TRACE(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer) { ZT_RemoteTrace rt; const char *ptr = reinterpret_cast(data()) + ZT_PACKET_IDX_PAYLOAD; const char *const eof = reinterpret_cast(data()) + size(); rt.origin = peer->address().toInt(); rt.data = const_cast(ptr); // start of first string while (ptr < eof) { if (!*ptr) { // end of string rt.len = (unsigned int)(ptr - rt.data); if ((rt.len > 0)&&(rt.len <= ZT_MAX_REMOTE_TRACE_SIZE)) { RR->node->postEvent(tPtr,ZT_EVENT_REMOTE_TRACE,&rt); } rt.data = const_cast(++ptr); // start of next string, if any } else { ++ptr; } } peer->received(tPtr,_path,hops(),packetId(),Packet::VERB_REMOTE_TRACE,0,Packet::VERB_NOP,false,0); return true; } void IncomingPacket::_sendErrorNeedCredentials(const RuntimeEnvironment *RR,void *tPtr,const SharedPtr &peer,const uint64_t nwid) { const int64_t now = RR->node->now(); if (peer->rateGateOutgoingComRequest(now)) { Packet outp(source(),RR->identity.address(),Packet::VERB_ERROR); outp.append((uint8_t)verb()); outp.append(packetId()); outp.append((uint8_t)Packet::ERROR_NEED_MEMBERSHIP_CERTIFICATE); outp.append(nwid); outp.armor(peer->key(),true); _path->send(RR,tPtr,outp.data(),outp.size(),now); } } } // namespace ZeroTier