mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-23 14:52:24 +00:00
679 lines
32 KiB
C++
679 lines
32 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "../version.h"
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#include "Constants.hpp"
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#include "Defaults.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Topology.hpp"
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#include "PacketDecoder.hpp"
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#include "Switch.hpp"
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#include "Peer.hpp"
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#include "NodeConfig.hpp"
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#include "Filter.hpp"
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#include "Service.hpp"
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#include "Demarc.hpp"
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namespace ZeroTier {
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bool PacketDecoder::tryDecode(const RuntimeEnvironment *_r)
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throw(std::out_of_range,std::runtime_error)
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{
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if ((!encrypted())&&(verb() == Packet::VERB_HELLO)) {
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// Unencrypted HELLOs are handled here since they are used to
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// populate our identity cache in the first place. _doHELLO() is special
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// in that it contains its own authentication logic.
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TRACE("HELLO from %s(%s)",source().toString().c_str(),_remoteAddress.toString().c_str());
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return _doHELLO(_r);
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}
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SharedPtr<Peer> peer = _r->topology->getPeer(source());
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if (peer) {
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// Resume saved intermediate decode state?
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if (_step == DECODE_WAITING_FOR_MULTICAST_FRAME_ORIGINAL_SENDER_LOOKUP) {
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// In this state we have already authenticated and decrypted the
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// packet and are waiting for the lookup of the original sender
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// for a multicast frame. So check to see if we've got it.
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return _doMULTICAST_FRAME(_r,peer);
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}
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if (!dearmor(peer->key())) {
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TRACE("dropped packet from %s(%s), MAC authentication failed (size: %u)",source().toString().c_str(),_remoteAddress.toString().c_str(),size());
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return true;
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}
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if (!uncompress()) {
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TRACE("dropped packet from %s(%s), compressed data invalid",source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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}
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Packet::Verb v = verb();
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// Once a packet is determined to be basically valid, it can be used
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// to passively learn a new network path to the sending peer. It
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// also results in statistics updates.
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peer->onReceive(_r,_localPort,_remoteAddress,hops(),v,Utils::now());
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switch(v) {
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case Packet::VERB_NOP:
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TRACE("NOP from %s(%s)",source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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case Packet::VERB_HELLO:
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return _doHELLO(_r); // legal, but why? :)
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case Packet::VERB_ERROR:
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return _doERROR(_r,peer);
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case Packet::VERB_OK:
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return _doOK(_r,peer);
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case Packet::VERB_WHOIS:
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return _doWHOIS(_r,peer);
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case Packet::VERB_RENDEZVOUS:
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return _doRENDEZVOUS(_r,peer);
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case Packet::VERB_FRAME:
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return _doFRAME(_r,peer);
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case Packet::VERB_PROXY_FRAME:
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return _doPROXY_FRAME(_r,peer);
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case Packet::VERB_MULTICAST_FRAME:
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return _doMULTICAST_FRAME(_r,peer);
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case Packet::VERB_MULTICAST_LIKE:
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return _doMULTICAST_LIKE(_r,peer);
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case Packet::VERB_NETWORK_MEMBERSHIP_CERTIFICATE:
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return _doNETWORK_MEMBERSHIP_CERTIFICATE(_r,peer);
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case Packet::VERB_NETWORK_CONFIG_REQUEST:
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return _doNETWORK_CONFIG_REQUEST(_r,peer);
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case Packet::VERB_NETWORK_CONFIG_REFRESH:
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return _doNETWORK_CONFIG_REFRESH(_r,peer);
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default:
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// This might be something from a new or old version of the protocol.
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// Technically it passed MAC so the packet is still valid, but we
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// ignore it.
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TRACE("ignored unrecognized verb %.2x from %s(%s)",(unsigned int)v,source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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}
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} else {
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_step = DECODE_WAITING_FOR_SENDER_LOOKUP; // should already be this...
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_r->sw->requestWhois(source());
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return false;
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}
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}
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bool PacketDecoder::_doERROR(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_ERROR_IDX_IN_RE_VERB];
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Packet::ErrorCode errorCode = (Packet::ErrorCode)(*this)[ZT_PROTO_VERB_ERROR_IDX_ERROR_CODE];
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TRACE("ERROR %s from %s(%s) in-re %s",Packet::errorString(errorCode),source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
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switch(errorCode) {
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case Packet::ERROR_OBJ_NOT_FOUND:
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if (inReVerb == Packet::VERB_WHOIS) {
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// TODO: abort WHOIS if sender is a supernode
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}
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break;
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case Packet::ERROR_IDENTITY_COLLISION:
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// TODO: if it comes from a supernode, regenerate a new identity
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break;
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case Packet::ERROR_NO_MEMBER_CERTIFICATE:
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// TODO: send member certificate
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break;
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default:
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break;
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}
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} catch (std::exception &ex) {
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TRACE("dropped ERROR from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped ERROR from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doHELLO(const RuntimeEnvironment *_r)
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{
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try {
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unsigned int protoVersion = (*this)[ZT_PROTO_VERB_HELLO_IDX_PROTOCOL_VERSION];
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unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MAJOR_VERSION];
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unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO_IDX_MINOR_VERSION];
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unsigned int vRevision = at<uint16_t>(ZT_PROTO_VERB_HELLO_IDX_REVISION);
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uint64_t timestamp = at<uint64_t>(ZT_PROTO_VERB_HELLO_IDX_TIMESTAMP);
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Identity id(*this,ZT_PROTO_VERB_HELLO_IDX_IDENTITY);
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if (protoVersion != ZT_PROTO_VERSION) {
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TRACE("dropped HELLO from %s(%s): protocol version mismatch (%u, expected %u)",source().toString().c_str(),_remoteAddress.toString().c_str(),protoVersion,(unsigned int)ZT_PROTO_VERSION);
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return true;
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}
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if (!id.locallyValidate()) {
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TRACE("dropped HELLO from %s(%s): identity invalid",source().toString().c_str(),_remoteAddress.toString().c_str());
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return true;
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}
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SharedPtr<Peer> peer(_r->topology->getPeer(id.address()));
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if (peer) {
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if (peer->identity() != id) {
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unsigned char key[ZT_PEER_SECRET_KEY_LENGTH];
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if (_r->identity.agree(id,key,ZT_PEER_SECRET_KEY_LENGTH)) {
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TRACE("rejected HELLO from %s(%s): address already claimed",source().toString().c_str(),_remoteAddress.toString().c_str());
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Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(packetId());
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outp.append((unsigned char)Packet::ERROR_IDENTITY_COLLISION);
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outp.armor(key,true);
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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}
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return true;
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}
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} else peer = _r->topology->addPeer(SharedPtr<Peer>(new Peer(_r->identity,id)));
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peer->onReceive(_r,_localPort,_remoteAddress,hops(),Packet::VERB_HELLO,Utils::now());
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peer->setRemoteVersion(vMajor,vMinor,vRevision);
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Packet outp(source(),_r->identity.address(),Packet::VERB_OK);
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outp.append((unsigned char)Packet::VERB_HELLO);
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outp.append(packetId());
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outp.append(timestamp);
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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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outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR);
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outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION);
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outp.armor(peer->key(),true);
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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} catch (std::exception &ex) {
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TRACE("dropped HELLO from %s(%s): %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped HELLO from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doOK(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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Packet::Verb inReVerb = (Packet::Verb)(*this)[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB];
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switch(inReVerb) {
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case Packet::VERB_HELLO: {
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// OK from HELLO permits computation of latency.
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unsigned int latency = std::min((unsigned int)(Utils::now() - at<uint64_t>(ZT_PROTO_VERB_HELLO__OK__IDX_TIMESTAMP)),(unsigned int)0xffff);
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unsigned int vMajor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MAJOR_VERSION];
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unsigned int vMinor = (*this)[ZT_PROTO_VERB_HELLO__OK__IDX_MINOR_VERSION];
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unsigned int vRevision = at<uint16_t>(ZT_PROTO_VERB_HELLO__OK__IDX_REVISION);
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TRACE("%s(%s): OK(HELLO), latency: %u, version %u.%u.%u",source().toString().c_str(),_remoteAddress.toString().c_str(),latency,vMajor,vMinor,vRevision);
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peer->setLatency(_remoteAddress,latency);
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peer->setRemoteVersion(vMajor,vMinor,vRevision);
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} break;
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case Packet::VERB_WHOIS: {
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// Right now only supernodes are allowed to send OK(WHOIS) to prevent
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// poisoning attacks. Further decentralization will require some other
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// kind of trust mechanism.
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if (_r->topology->isSupernode(source())) {
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Identity id(*this,ZT_PROTO_VERB_WHOIS__OK__IDX_IDENTITY);
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if (id.locallyValidate())
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_r->sw->doAnythingWaitingForPeer(_r->topology->addPeer(SharedPtr<Peer>(new Peer(_r->identity,id))));
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}
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} break;
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case Packet::VERB_NETWORK_CONFIG_REQUEST: {
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SharedPtr<Network> nw(_r->nc->network(at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_NETWORK_ID)));
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if ((nw)&&(nw->controller() == source())) {
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// OK(NETWORK_CONFIG_REQUEST) is only accepted from a network's
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// controller.
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unsigned int dictlen = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT_LEN);
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std::string dict((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST__OK__IDX_DICT,dictlen),dictlen);
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if (dict.length()) {
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Network::Config netconf(dict);
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TRACE("got network configuration for network %.16llx from %s",(unsigned long long)nw->id(),source().toString().c_str());
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nw->setConfiguration(netconf);
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}
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}
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} break;
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default:
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//TRACE("%s(%s): OK(%s)",source().toString().c_str(),_remoteAddress.toString().c_str(),Packet::verbString(inReVerb));
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break;
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}
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} catch (std::exception &ex) {
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TRACE("dropped OK from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped OK from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doWHOIS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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if (payloadLength() == ZT_ADDRESS_LENGTH) {
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SharedPtr<Peer> p(_r->topology->getPeer(Address(payload(),ZT_ADDRESS_LENGTH)));
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if (p) {
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Packet outp(source(),_r->identity.address(),Packet::VERB_OK);
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outp.append((unsigned char)Packet::VERB_WHOIS);
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outp.append(packetId());
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p->identity().serialize(outp,false);
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outp.armor(peer->key(),true);
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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//TRACE("sent WHOIS response to %s for %s",source().toString().c_str(),Address(payload(),ZT_ADDRESS_LENGTH).toString().c_str());
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} else {
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Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_WHOIS);
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outp.append(packetId());
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outp.append((unsigned char)Packet::ERROR_OBJ_NOT_FOUND);
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outp.append(payload(),ZT_ADDRESS_LENGTH);
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outp.armor(peer->key(),true);
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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//TRACE("sent WHOIS ERROR to %s for %s (not found)",source().toString().c_str(),Address(payload(),ZT_ADDRESS_LENGTH).toString().c_str());
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}
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} else {
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TRACE("dropped WHOIS from %s(%s): missing or invalid address",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doRENDEZVOUS(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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/*
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* At the moment, we only obey RENDEZVOUS if it comes from a designated
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* supernode. If relay offloading is implemented to scale the net, this
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* will need reconsideration.
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*
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* The reason is that RENDEZVOUS could technically be used to cause a
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* peer to send a weird encrypted UDP packet to an arbitrary IP:port.
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* The sender of RENDEZVOUS has no control over the content of this
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* packet, but it's still maybe something we want to not allow just
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* anyone to order due to possible DDOS or network forensic implications.
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* So if we diversify relays, we'll need some way of deciding whether the
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* sender is someone we should trust with a RENDEZVOUS hint.
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*/
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if (_r->topology->isSupernode(source())) {
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Address with(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH),ZT_ADDRESS_LENGTH);
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SharedPtr<Peer> withPeer(_r->topology->getPeer(with));
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if (withPeer) {
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unsigned int port = at<uint16_t>(ZT_PROTO_VERB_RENDEZVOUS_IDX_PORT);
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unsigned int addrlen = (*this)[ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRLEN];
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if ((port > 0)&&((addrlen == 4)||(addrlen == 16))) {
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InetAddress atAddr(field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ADDRESS,addrlen),addrlen,port);
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TRACE("RENDEZVOUS from %s says %s might be at %s, starting NAT-t",source().toString().c_str(),with.toString().c_str(),atAddr.toString().c_str());
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_r->sw->contact(withPeer,atAddr);
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} else {
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TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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} else {
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TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",source().toString().c_str(),_remoteAddress.toString().c_str(),with.toString().c_str());
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}
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} else {
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TRACE("ignored RENDEZVOUS from %s(%s): source not supernode",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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} catch (std::exception &ex) {
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TRACE("dropped RENDEZVOUS from %s(%s): %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped RENDEZVOUS from %s(%s): unexpected exception",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doFRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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SharedPtr<Network> network(_r->nc->network(at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID)));
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if (network) {
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if (network->isAllowed(source())) {
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unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE);
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if (network->permitsEtherType(etherType)) {
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network->tap().put(source().toMAC(),network->tap().mac(),etherType,data() + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD,size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD);
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} else if (size() > ZT_PROTO_VERB_FRAME_IDX_PAYLOAD) {
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TRACE("dropped FRAME from %s: ethernet type %u not allowed on network %.16llx",source().toString().c_str(),etherType,(unsigned long long)network->id());
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}
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// Source moves "closer" to us in multicast propagation priority when
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// we receive unicast frames from it. This is called "implicit social
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// ordering" in other docs.
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_r->mc->bringCloser(network->id(),source());
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} else {
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TRACE("dropped FRAME from %s(%s): not a member of closed network %llu",source().toString().c_str(),_remoteAddress.toString().c_str(),network->id());
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Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
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outp.append((unsigned char)Packet::VERB_FRAME);
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outp.append(packetId());
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outp.append((unsigned char)Packet::ERROR_NO_MEMBER_CERTIFICATE);
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outp.append(network->id());
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outp.armor(peer->key(),true);
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_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
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}
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} else {
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TRACE("dropped FRAME from %s(%s): network %llu unknown",source().toString().c_str(),_remoteAddress.toString().c_str(),at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
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}
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} catch (std::exception &ex) {
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TRACE("dropped FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
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} catch ( ... ) {
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TRACE("dropped FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
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}
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return true;
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}
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bool PacketDecoder::_doPROXY_FRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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// TODO: bridging is not implemented yet
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return true;
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}
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bool PacketDecoder::_doMULTICAST_FRAME(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
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{
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try {
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Address origin(Address(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ORIGIN,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_ORIGIN),ZT_ADDRESS_LENGTH));
|
|
SharedPtr<Peer> originPeer(_r->topology->getPeer(origin));
|
|
if (!originPeer) {
|
|
// We must have the origin's identity in order to authenticate a multicast
|
|
_r->sw->requestWhois(origin);
|
|
_step = DECODE_WAITING_FOR_MULTICAST_FRAME_ORIGINAL_SENDER_LOOKUP; // causes processing to come back here
|
|
return false;
|
|
}
|
|
|
|
// These fields change
|
|
unsigned int depth = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_DEPTH);
|
|
unsigned char *const fifo = field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_FIFO,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_FIFO);
|
|
unsigned char *const bloom = field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_BLOOM,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_BLOOM);
|
|
|
|
// These fields don't -- they're signed by the original sender
|
|
// const unsigned int flags = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FLAGS];
|
|
const uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID);
|
|
const uint16_t bloomNonce = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_BLOOM_NONCE);
|
|
const unsigned int prefixBits = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_PREFIX_BITS];
|
|
const unsigned int prefix = (*this)[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_PREFIX];
|
|
const uint64_t guid = at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_GUID);
|
|
const MAC sourceMac(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_SOURCE_MAC));
|
|
const MulticastGroup dest(MAC(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_MAC,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_DEST_MAC)),at<uint32_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DEST_ADI));
|
|
const unsigned int etherType = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE);
|
|
const unsigned int frameLen = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME_LEN);
|
|
const unsigned char *const frame = field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME,frameLen);
|
|
const unsigned int signatureLen = at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME + frameLen);
|
|
const unsigned char *const signature = field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME + frameLen + 2,signatureLen);
|
|
|
|
const unsigned int signedPartLen = (ZT_PROTO_VERB_MULTICAST_FRAME_IDX_FRAME - ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION) + frameLen;
|
|
if (!originPeer->identity().verify(field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX__START_OF_SIGNED_PORTION,signedPartLen),signedPartLen,signature,signatureLen)) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): failed signature verification, claims to be from %s",source().toString().c_str(),_remoteAddress.toString().c_str(),origin.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
char mct[256];
|
|
unsigned int startingFifoItems = 0;
|
|
for(unsigned int i=0;i<ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_FIFO;i+=ZT_ADDRESS_LENGTH) {
|
|
if (Utils::isZero(fifo + i,ZT_ADDRESS_LENGTH))
|
|
break;
|
|
else ++startingFifoItems;
|
|
}
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s <- %.16llx %.16llx %s via %s prefix:%u depth:%u len:%u fifo:%u",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),nwid,guid,origin.toString().c_str(),source().toString().c_str(),prefix,depth,frameLen,startingFifoItems);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
|
|
// Security check to prohibit multicasts that are really Ethernet unicasts
|
|
if (!dest.mac().isMulticast()) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): %s is not a multicast/broadcast address",source().toString().c_str(),_remoteAddress.toString().c_str(),dest.mac().toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
bool rateLimitsExceeded = false;
|
|
unsigned int maxDepth = ZT_MULTICAST_GLOBAL_MAX_DEPTH;
|
|
|
|
if ((origin == _r->identity.address())||(_r->mc->deduplicate(nwid,guid))) {
|
|
// Ordinary frames will drop duplicates. Supernodes keep propagating
|
|
// them since they're used as hubs to link disparate clusters of
|
|
// members of the same multicast group.
|
|
if (!_r->topology->amSupernode()) {
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s dropped %.16llx: duplicate",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),guid);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): duplicate",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
} else {
|
|
// Supernodes however won't do this more than once. If the supernode
|
|
// does happen to be a member of the network -- which is usually not
|
|
// true -- we don't want to see a ton of copies of the same frame on
|
|
// its tap device. Also double or triple counting bandwidth metrics
|
|
// for the same frame would not be fair.
|
|
SharedPtr<Network> network(_r->nc->network(nwid));
|
|
if (network) {
|
|
maxDepth = std::min((unsigned int)ZT_MULTICAST_GLOBAL_MAX_DEPTH,network->multicastDepth());
|
|
if (!network->isAllowed(origin)) {
|
|
TRACE("didn't inject MULTICAST_FRAME from %s(%s) into %.16llx: sender %s not allowed or we don't have a certificate",source().toString().c_str(),nwid,_remoteAddress.toString().c_str(),origin.toString().c_str());
|
|
|
|
Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
|
|
outp.append((unsigned char)Packet::VERB_FRAME);
|
|
outp.append(packetId());
|
|
outp.append((unsigned char)Packet::ERROR_NO_MEMBER_CERTIFICATE);
|
|
outp.append(nwid);
|
|
outp.armor(peer->key(),true);
|
|
_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
|
|
|
|
// We do not terminate here, since if the member just has an out of
|
|
// date cert or hasn't sent us a cert yet we still want to propagate
|
|
// the message so multicast works.
|
|
} else if ((!network->permitsBridging())&&(!origin.wouldHaveMac(sourceMac))) {
|
|
TRACE("didn't inject MULTICAST_FRAME from %s(%s) into %.16llx: source mac %s doesn't belong to %s, and bridging is not supported on network",source().toString().c_str(),nwid,_remoteAddress.toString().c_str(),sourceMac.toString().c_str(),origin.toString().c_str());
|
|
} else if (!network->permitsEtherType(etherType)) {
|
|
TRACE("didn't inject MULTICAST_FRAME from %s(%s) into %.16llx: ethertype %u is not allowed",source().toString().c_str(),nwid,_remoteAddress.toString().c_str(),etherType);
|
|
} else if (!network->updateAndCheckMulticastBalance(origin,dest,frameLen)) {
|
|
rateLimitsExceeded = true;
|
|
} else {
|
|
network->tap().put(sourceMac,dest.mac(),etherType,frame,frameLen);
|
|
}
|
|
}
|
|
}
|
|
|
|
// We can only really know if rate limit was exceeded if we're a member of
|
|
// this network. This will nearly always be true for anyone getting a
|
|
// multicast except supernodes, so the net effect will be to truncate
|
|
// multicast propagation if the rate limit is exceeded.
|
|
if (rateLimitsExceeded) {
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s dropped %.16llx: rate limits exceeded",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),guid);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): rate limits exceeded for sender %s",source().toString().c_str(),_remoteAddress.toString().c_str(),origin.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
if (depth == 0xffff) {
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s not forwarding %.16llx: depth == 0xffff (do not forward)",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),guid);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
TRACE("not forwarding MULTICAST_FRAME from %s(%s): depth == 0xffff (do not forward)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
if (++depth > maxDepth) {
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s not forwarding %.16llx: max propagation depth reached",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),guid);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
TRACE("not forwarding MULTICAST_FRAME from %s(%s): max propagation depth reached",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
setAt(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_DEPTH,(uint16_t)depth);
|
|
|
|
// New FIFO with room for one extra, since head will be next hop
|
|
unsigned char newFifo[ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_FIFO + ZT_ADDRESS_LENGTH];
|
|
unsigned char *newFifoPtr = newFifo;
|
|
unsigned char *const newFifoEnd = newFifo + sizeof(newFifo);
|
|
|
|
// Copy old FIFO into new buffer, terminating at first NULL address
|
|
for(unsigned char *f=fifo,*const fifoEnd=(fifo + ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_FIFO);f!=fifoEnd;) {
|
|
unsigned char *nf = newFifoPtr;
|
|
unsigned char *e = nf + ZT_ADDRESS_LENGTH;
|
|
unsigned char *ftmp = f;
|
|
unsigned char zeroCheckMask = 0;
|
|
while (nf != e)
|
|
zeroCheckMask |= (*(nf++) = *(ftmp++));
|
|
if (zeroCheckMask) {
|
|
f = ftmp;
|
|
newFifoPtr = nf;
|
|
} else break;
|
|
}
|
|
|
|
// Add any next hops we know about to FIFO
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
unsigned char *beforeAdd = newFifoPtr;
|
|
#endif
|
|
_r->mc->getNextHops(nwid,dest,Multicaster::AddToPropagationQueue(&newFifoPtr,newFifoEnd,bloom,bloomNonce,origin,prefixBits,prefix));
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
unsigned int numAdded = (unsigned int)(newFifoPtr - beforeAdd) / ZT_ADDRESS_LENGTH;
|
|
#endif
|
|
|
|
// Zero-terminate new FIFO if not completely full
|
|
while (newFifoPtr != newFifoEnd)
|
|
*(newFifoPtr++) = (unsigned char)0;
|
|
|
|
// First element in newFifo[] is next hop
|
|
Address nextHop(newFifo,ZT_ADDRESS_LENGTH);
|
|
if ((!nextHop)&&(!_r->topology->amSupernode())) {
|
|
SharedPtr<Peer> supernode(_r->topology->getBestSupernode(&origin,1,true));
|
|
if (supernode)
|
|
nextHop = supernode->address();
|
|
}
|
|
if ((!nextHop)||(nextHop == _r->identity.address())) { // check against our addr is a sanity check
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s not forwarding %.16llx: no next hop",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),guid);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
//TRACE("not forwarding MULTICAST_FRAME from %s(%s): no next hop",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
return true;
|
|
}
|
|
|
|
// The rest of newFifo[] goes back into the packet
|
|
memcpy(fifo,newFifo + ZT_ADDRESS_LENGTH,ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_FIFO);
|
|
|
|
#ifdef ZT_TRACE_MULTICAST
|
|
Utils::snprintf(mct,sizeof(mct),"%c %s -> %.16llx %.16llx %s to next hop %s +fifo:%u",(_r->topology->amSupernode() ? 'S' : '-'),_r->identity.address().toString().c_str(),nwid,guid,origin.toString().c_str(),nextHop.toString().c_str(),numAdded);
|
|
_r->demarc->send(Demarc::ANY_PORT,ZT_DEFAULTS.multicastTraceWatcher,mct,strlen(mct),-1);
|
|
#endif
|
|
|
|
// Send to next hop, reusing this packet as scratch space
|
|
newInitializationVector();
|
|
setDestination(nextHop);
|
|
setSource(_r->identity.address());
|
|
compress(); // note: bloom filters and empty FIFOs are highly compressable!
|
|
_r->sw->send(*this,true);
|
|
|
|
return true;
|
|
} catch (std::exception &ex) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doMULTICAST_LIKE(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
unsigned int ptr = ZT_PACKET_IDX_PAYLOAD;
|
|
if (ptr >= size())
|
|
return true;
|
|
uint64_t now = Utils::now();
|
|
Address src(source());
|
|
|
|
// Iterate through 18-byte network,MAC,ADI tuples
|
|
for(;;) {
|
|
_r->mc->likesGroup(at<uint64_t>(ptr),src,MulticastGroup(MAC(field(ptr + 8,6)),at<uint32_t>(ptr + 14)),now);
|
|
if ((ptr += 18) >= size())
|
|
break;
|
|
}
|
|
} catch (std::exception &ex) {
|
|
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),ex.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doNETWORK_MEMBERSHIP_CERTIFICATE(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
// TODO: not implemented yet, will be needed for private networks.
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doNETWORK_CONFIG_REQUEST(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_NETWORK_ID);
|
|
#ifndef __WINDOWS__
|
|
if (_r->netconfService) {
|
|
char tmp[128];
|
|
unsigned int dictLen = at<uint16_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT_LEN);
|
|
|
|
Dictionary request;
|
|
if (dictLen)
|
|
request["meta"] = std::string((const char *)field(ZT_PROTO_VERB_NETWORK_CONFIG_REQUEST_IDX_DICT,dictLen),dictLen);
|
|
request["type"] = "netconf-request";
|
|
request["peerId"] = peer->identity().toString(false);
|
|
Utils::snprintf(tmp,sizeof(tmp),"%llx",(unsigned long long)nwid);
|
|
request["nwid"] = tmp;
|
|
Utils::snprintf(tmp,sizeof(tmp),"%llx",(unsigned long long)packetId());
|
|
request["requestId"] = tmp;
|
|
//TRACE("to netconf:\n%s",request.toString().c_str());
|
|
_r->netconfService->send(request);
|
|
} else {
|
|
#endif // !__WINDOWS__
|
|
Packet outp(source(),_r->identity.address(),Packet::VERB_ERROR);
|
|
outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);
|
|
outp.append(packetId());
|
|
outp.append((unsigned char)Packet::ERROR_UNSUPPORTED_OPERATION);
|
|
outp.append(nwid);
|
|
outp.armor(peer->key(),true);
|
|
_r->demarc->send(_localPort,_remoteAddress,outp.data(),outp.size(),-1);
|
|
#ifndef __WINDOWS__
|
|
}
|
|
#endif // !__WINDOWS__
|
|
} catch (std::exception &exc) {
|
|
TRACE("dropped NETWORK_CONFIG_REQUEST from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped NETWORK_CONFIG_REQUEST from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool PacketDecoder::_doNETWORK_CONFIG_REFRESH(const RuntimeEnvironment *_r,const SharedPtr<Peer> &peer)
|
|
{
|
|
try {
|
|
uint64_t nwid = at<uint64_t>(ZT_PROTO_VERB_NETWORK_CONFIG_REFRESH_IDX_NETWORK_ID);
|
|
SharedPtr<Network> nw(_r->nc->network(nwid));
|
|
if ((nw)&&(source() == nw->controller())) // only respond to requests from controller
|
|
nw->requestConfiguration();
|
|
} catch (std::exception &exc) {
|
|
TRACE("dropped NETWORK_CONFIG_REFRESH from %s(%s): unexpected exception: %s",source().toString().c_str(),_remoteAddress.toString().c_str(),exc.what());
|
|
} catch ( ... ) {
|
|
TRACE("dropped NETWORK_CONFIG_REFRESH from %s(%s): unexpected exception: (unknown)",source().toString().c_str(),_remoteAddress.toString().c_str());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} // namespace ZeroTier
|