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Factoring out packet decoder from Switch to put that object on a little bit of a diet. Work in progress, wont build yet.

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This commit is contained in:
Adam Ierymenko 2013-07-11 16:19:06 -04:00
parent bcd079b70e
commit ffad0b2780
6 changed files with 551 additions and 371 deletions
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45
node/Multicaster.hpp
View File

@ -81,6 +81,7 @@ public:
* Generate a signature of a multicast packet using an identity
*
* @param id Identity to sign with (must have secret key portion)
* @param nwid Network ID
* @param from MAC address of sender
* @param to Multicast group
* @param etherType 16-bit ethernet type
@ -88,10 +89,10 @@ public:
* @param len Length of frame
* @return ECDSA signature
*/
static inline std::string signMulticastPacket(const Identity &id,const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len)
static inline std::string signMulticastPacket(const Identity &id,uint64_t nwid,const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len)
{
unsigned char digest[32];
_hashMulticastPacketForSig(from,to,etherType,data,len,digest);
_hashMulticastPacketForSig(nwid,from,to,etherType,data,len,digest);
return id.sign(digest);
}
@ -99,6 +100,7 @@ public:
* Verify a signature from a multicast packet
*
* @param id Identity of original signer
* @param nwid Network ID
* @param from MAC address of sender
* @param to Multicast group
* @param etherType 16-bit ethernet type
@ -108,11 +110,11 @@ public:
* @param siglen Length of signature in bytes
* @return ECDSA signature
*/
static bool verifyMulticastPacket(const Identity &id,const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len,const void *signature,unsigned int siglen)
static bool verifyMulticastPacket(const Identity &id,uint64_t nwid,const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len,const void *signature,unsigned int siglen)
{
unsigned char digest[32];
_hashMulticastPacketForSig(from,to,etherType,data,len,digest);
return id.verify(digest,signature,siglen);
_hashMulticastPacketForSig(nwid,from,to,etherType,data,len,digest);
return id.verifySignature(digest,signature,siglen);
}
/**
@ -183,6 +185,7 @@ public:
* @param topology Topology object or mock thereof
* @param nwid Network ID
* @param mg Multicast group
* @param originalSubmitter Original submitter of multicast message to network
* @param upstream Address from which message originated, or null (0) address if none
* @param bf Bloom filter, updated in place with sums of addresses in chosen peers and/or decay
* @param max Maximum number of peers to pick
@ -197,6 +200,7 @@ public:
T &topology,
uint64_t nwid,
const MulticastGroup &mg,
const Address &originalSubmitter,
const Address &upstream,
MulticastBloomFilter &bf,
unsigned int max,
@ -240,12 +244,15 @@ public:
}
// If it's not expired and it's from our random sample, add it to the set of peers
// to consider.
P peer = topology.getPeer(channelMemberEntry->first);
if (peer) {
toConsider[sampleSize++] = peer;
if (sampleSize >= ZT_MULTICAST_PICK_MAX_SAMPLE_SIZE)
break; // abort if we have enough candidates
// to consider. Exclude immediate upstream and original submitter, since we know for
// a fact they've already seen this.
if ((channelMemberEntry->first != originalSubmitter)&&(channelMemberEntry->first != upstream)) {
P peer = topology.getPeer(channelMemberEntry->first);
if (peer) {
toConsider[sampleSize++] = peer;
if (sampleSize >= ZT_MULTICAST_PICK_MAX_SAMPLE_SIZE)
break; // abort if we have enough candidates
}
}
++channelMemberEntry;
}
@ -264,7 +271,10 @@ public:
// Decay a few random bits in bloom filter to probabilistically eliminate
// false positives as we go. The odds of decaying an already-set bit
// increases as the bloom filter saturates, so in the early hops of
// propagation this likely won't have any effect.
// propagation this likely won't have any effect. This allows peers with
// bloom filter collisions to be reconsidered, but at positions on the
// network graph likely to be hops away from the original origin of the
// message.
for(unsigned int i=0;i<ZT_MULTICAST_BLOOM_FILTER_DECAY_RATE;++i)
bf.decay();
@ -278,8 +288,7 @@ public:
// Add a supernode if there's nowhere else to go. Supernodes know of all multicast
// LIKEs and so can act to bridge sparse multicast groups. We do not remember them
// in the bloom filter, since such bridging may very well need to happen more than
// once.
// in the bloom filter.
if (!picked) {
P peer = topology.getBestSupernode();
if (peer)
@ -300,20 +309,20 @@ private:
}
};
static inline void _hashMulticastPacketForSig(const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len,unsigned char *digest)
static inline void _hashMulticastPacketForSig(uint64_t nwid,const MAC &from,const MulticastGroup &to,unsigned int etherType,const void *data,unsigned int len,unsigned char *digest)
throw()
{
unsigned char zero = 0;
SHA256_CTX sha;
SHA256_Init(&sha);
uint64_t _nwid = Utils::hton(network->id());
uint64_t _nwid = Utils::hton(nwid);
SHA256_Update(&sha,(unsigned char *)&_nwid,sizeof(_nwid));
SHA256_Update(&sha,&zero,1);
SHA256_Update(&sha,(unsigned char *)from.data,6);
SHA256_Update(&sha,&zero,1);
SHA256_Update(&sha,(unsigned char *)mg.mac().data,6);
SHA256_Update(&sha,(unsigned char *)to.mac().data,6);
SHA256_Update(&sha,&zero,1);
uint32_t _adi = Utils::hton(mg.adi());
uint32_t _adi = Utils::hton(to.adi());
SHA256_Update(&sha,(unsigned char *)&_adi,sizeof(_adi));
SHA256_Update(&sha,&zero,1);
uint16_t _etype = Utils::hton((uint16_t)etherType);

12
node/Packet.hpp
View File

@ -562,6 +562,18 @@ public:
setVerb(v);
}
/**
* Generate a new IV / packet ID in place
*
* This can be used to re-use a packet buffer multiple times to send
* technically different but otherwise identical copies of the same
* packet.
*/
inline void newInitializationVector()
{
Utils::getSecureRandom(field(ZT_PACKET_IDX_IV,8),8);
}
/**
* Set this packet's destination
*

40
node/PacketDecoder.cpp Normal file
View File

@ -0,0 +1,40 @@
/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* 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 <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#include "RuntimeEnvironment.hpp"
#include "Topology.hpp"
#include "PacketDecoder.hpp"
#include "Switch.hpp"
namespace ZeroTier {
bool PacketDecoder::tryDecode(const RuntimeEnvironment *_r)
throw(std::out_of_range,std::runtime_error)
{
}
} // namespace ZeroTier

94
node/PacketDecoder.hpp Normal file
View File

@ -0,0 +1,94 @@
/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* 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 <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#ifndef _ZT_PACKETDECODER_HPP
#define _ZT_PACKETDECODER_HPP
#include <stdexcept>
#include "Packet.hpp"
#include "Demarc.hpp"
#include "InetAddress.hpp"
#include "Utils.hpp"
#include "SharedPtr.hpp"
#include "AtomicCounter.hpp"
namespace ZeroTier {
class RuntimeEnvironment;
/**
* Subclass of packet that handles the decoding of it
*/
class PacketDecoder : public Packet
{
friend class SharedPtr<PacketDecoder>;
public:
template<unsigned int C2>
PacketDecoder(const Buffer<C2> &b,Demarc::Port localPort,const InetAddress &remoteAddress)
throw(std::out_of_range) :
Packet(b) :
_receiveTime(Utils::now()),
_localPort(localPort),
_remoteAddress(remoteAddress),
_step(DECODE_STEP_START),
__refCount()
{
}
/**
* Attempt to decode this packet
*
* @param _r Runtime environment
* @return True if decoding and processing is complete, false on failure (try again)
*/
bool tryDecode(const RuntimeEnvironment *_r)
throw(std::out_of_range,std::runtime_error);
/**
* @return Time of packet receipt
*/
inline uint64_t receiveTime() const throw() { return _receiveTime; }
private:
uint64_t _receiveTime;
Demarc::Port _localPort;
InetAddress _remoteAddress;
enum {
DECODE_STEP_START,
DECODE_STEP_WAITING_FOR_SENDER_LOOKUP, // on initial receipt, we need peer's identity
DECODE_STEP_WAITING_FOR_ORIGINAL_SUBMITTER_LOOKUP // this only applies to MULTICAST_FRAME
} _step;
AtomicCounter __refCount;
};
} // namespace ZeroTier
#endif

651
node/Switch.cpp
View File

@ -59,179 +59,25 @@ Switch::~Switch()
void Switch::onRemotePacket(Demarc::Port localPort,const InetAddress &fromAddr,const Buffer<4096> &data)
{
Packet packet;
try {
if (data.size() > ZT_PROTO_MIN_FRAGMENT_LENGTH) {
// Message is long enough to be a Packet or Packet::Fragment
if (data[ZT_PACKET_FRAGMENT_IDX_FRAGMENT_INDICATOR] == ZT_PACKET_FRAGMENT_INDICATOR) {
// Looks like a Packet::Fragment
Packet::Fragment fragment(data);
Address destination(fragment.destination());
if (destination != _r->identity.address()) {
// Fragment is not for us, so try to relay it
if (fragment.hops() < ZT_RELAY_MAX_HOPS) {
fragment.incrementHops();
SharedPtr<Peer> relayTo = _r->topology->getPeer(destination);
if ((!relayTo)||(!relayTo->send(_r,fragment.data(),fragment.size(),true,Packet::VERB_NOP,Utils::now()))) {
relayTo = _r->topology->getBestSupernode();
if (relayTo)
relayTo->send(_r,fragment.data(),fragment.size(),true,Packet::VERB_NOP,Utils::now());
}
} else {
TRACE("dropped relay [fragment](%s) -> %s, max hops exceeded",fromAddr.toString().c_str(),destination.toString().c_str());
}
} else {
// Fragment looks like ours
uint64_t pid = fragment.packetId();
unsigned int fno = fragment.fragmentNumber();
unsigned int tf = fragment.totalFragments();
if ((tf <= ZT_MAX_PACKET_FRAGMENTS)&&(fno < ZT_MAX_PACKET_FRAGMENTS)&&(fno > 0)&&(tf > 1)) {
// Fragment appears basically sane. Its fragment number must be
// 1 or more, since a Packet with fragmented bit set is fragment 0.
// Total fragments must be more than 1, otherwise why are we
// seeing a Packet::Fragment?
Mutex::Lock _l(_defragQueue_m);
std::map< uint64_t,DefragQueueEntry >::iterator dqe(_defragQueue.find(pid));
if (dqe == _defragQueue.end()) {
// We received a Packet::Fragment without its head, so queue it and wait
DefragQueueEntry &dq = _defragQueue[pid];
dq.creationTime = Utils::now();
dq.frags[fno - 1] = fragment;
dq.totalFragments = tf; // total fragment count is known
dq.haveFragments = 1 << fno; // we have only this fragment
//TRACE("fragment (%u/%u) of %.16llx from %s",fno + 1,tf,pid,fromAddr.toString().c_str());
} else if (!(dqe->second.haveFragments & (1 << fno))) {
// We have other fragments and maybe the head, so add this one and check
dqe->second.frags[fno - 1] = fragment;
dqe->second.totalFragments = tf;
//TRACE("fragment (%u/%u) of %.16llx from %s",fno + 1,tf,pid,fromAddr.toString().c_str());
if (Utils::countBits(dqe->second.haveFragments |= (1 << fno)) == tf) {
// We have all fragments -- assemble and process full Packet
//TRACE("packet %.16llx is complete, assembling and processing...",pid);
packet = dqe->second.frag0;
for(unsigned int f=1;f<tf;++f)
packet.append(dqe->second.frags[f - 1].payload(),dqe->second.frags[f - 1].payloadLength());
_defragQueue.erase(dqe);
goto Switch_onRemotePacket_complete_packet_handler;
}
} // else this is a duplicate fragment, ignore
}
}
_handleRemotePacketFragment(localPort,fromAddr,data);
} else if (data.size() > ZT_PROTO_MIN_PACKET_LENGTH) {
// Looks like a Packet -- either unfragmented or a fragmented packet head
packet = data;
Address destination(packet.destination());
if (destination != _r->identity.address()) {
// Packet is not for us, so try to relay it
if (packet.hops() < ZT_RELAY_MAX_HOPS) {
packet.incrementHops();
SharedPtr<Peer> relayTo = _r->topology->getPeer(destination);
if ((relayTo)&&(relayTo->send(_r,packet.data(),packet.size(),true,Packet::VERB_NOP,Utils::now()))) {
// TODO: don't unite immediately, wait until the peers have exchanged a packet or two
unite(packet.source(),destination,false); // periodically try to get them to talk directly
} else {
relayTo = _r->topology->getBestSupernode();
if (relayTo)
relayTo->send(_r,packet.data(),packet.size(),true,Packet::VERB_NOP,Utils::now());
}
} else {
TRACE("dropped relay %s(%s) -> %s, max hops exceeded",packet.source().toString().c_str(),fromAddr.toString().c_str(),destination.toString().c_str());
}
} else if (packet.fragmented()) {
// Packet is the head of a fragmented packet series
uint64_t pid = packet.packetId();
Mutex::Lock _l(_defragQueue_m);
std::map< uint64_t,DefragQueueEntry >::iterator dqe(_defragQueue.find(pid));
if (dqe == _defragQueue.end()) {
// If we have no other fragments yet, create an entry and save the head
DefragQueueEntry &dq = _defragQueue[pid];
dq.creationTime = Utils::now();
dq.frag0 = packet;
dq.totalFragments = 0; // 0 == unknown, waiting for Packet::Fragment
dq.haveFragments = 1; // head is first bit (left to right)
//TRACE("fragment (0/?) of %.16llx from %s",pid,fromAddr.toString().c_str());
} else if (!(dqe->second.haveFragments & 1)) {
// If we have other fragments but no head, see if we are complete with the head
if ((dqe->second.totalFragments)&&(Utils::countBits(dqe->second.haveFragments |= 1) == dqe->second.totalFragments)) {
// We have all fragments -- assemble and process full Packet
//TRACE("packet %.16llx is complete, assembling and processing...",pid);
// packet already contains head, so append fragments
for(unsigned int f=1;f<dqe->second.totalFragments;++f)
packet.append(dqe->second.frags[f - 1].payload(),dqe->second.frags[f - 1].payloadLength());
_defragQueue.erase(dqe);
goto Switch_onRemotePacket_complete_packet_handler;
} else {
// Still waiting on more fragments, so queue the head
dqe->second.frag0 = packet;
}
} // else this is a duplicate head, ignore
} else {
// Packet is unfragmented, so just process it
goto Switch_onRemotePacket_complete_packet_handler;
}
}
}
// If we made it here and didn't jump over, we either queued a fragment
// or dropped an invalid or duplicate one. (The goto looks easier to
// understand than having a million returns up there.)
return;
Switch_onRemotePacket_complete_packet_handler:
// Packets that get here are ours and are fully assembled. Don't worry -- if
// they are corrupt HMAC authentication will reject them later.
{
//TRACE("%s : %s -> %s",fromAddr.toString().c_str(),packet.source().toString().c_str(),packet.destination().toString().c_str());
PacketServiceAttemptResult r = _tryHandleRemotePacket(localPort,fromAddr,packet);
if (r != PACKET_SERVICE_ATTEMPT_OK) {
Address source(packet.source());
{
Mutex::Lock _l(_rxQueue_m);
std::multimap< Address,RXQueueEntry >::iterator qe(_rxQueue.insert(std::pair< Address,RXQueueEntry >(source,RXQueueEntry())));
qe->second.creationTime = Utils::now();
qe->second.packet = packet;
qe->second.localPort = localPort;
qe->second.fromAddr = fromAddr;
}
_handleRemotePacketHead(localPort,fromAddr,data);
}
}
} catch (std::exception &ex) {
TRACE("dropped packet from %s: %s",fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped packet from %s: unexpected exception",fromAddr.toString().c_str());
TRACE("dropped packet from %s: unknown exception",fromAddr.toString().c_str());
}
}
void Switch::onLocalEthernet(const SharedPtr<Network> &network,const MAC &from,const MAC &to,unsigned int etherType,const Buffer<4096> &data)
{
if (from != network->tap().mac()) {
LOG("ignored tap: %s -> %s %s (bridging is not supported)",from.toString().c_str(),to.toString().c_str(),Filter::etherTypeName(etherType));
LOG("ignored tap: %s -> %s %s (bridging is not (yet?) supported)",from.toString().c_str(),to.toString().c_str(),Filter::etherTypeName(etherType));
return;
}
@ -256,7 +102,49 @@ void Switch::onLocalEthernet(const SharedPtr<Network> &network,const MAC &from,c
mg = MulticastGroup::deriveMulticastGroupForAddressResolution(InetAddress(data.field(24,4),4,0));
}
_propagateMulticast(network,_r->identity.address(),(const unsigned char *)0,mg,0,from,etherType,data.data(),data.size());
Multicaster::MulticastBloomFilter newbf;
SharedPtr<Peer> propPeers[ZT_MULTICAST_PROPAGATION_BREADTH];
unsigned int np = _multicaster.pickNextPropagationPeers(
*(_r->topology),
network->id(),
mg,
_r->identity.address(),
Address(),
newbf,
ZT_MULTICAST_PROPAGATION_BREADTH,
propPeers,
Utils::now());
if (!np)
return;
std::string signature(Multicaster::signMulticastPacket(_r->identity,network->id(),from,mg,etherType,data,len));
if (!signature.length()) {
TRACE("failure signing multicast message!");
return;
}
Packet outpTmpl(propPeers[0]->address(),_r->identity.address(),Packet::VERB_MULTICAST_FRAME);
outpTmpl.append((uint8_t)0);
outpTmpl.append((uint64_t)network->id());
outpTmpl.append(_r->identity.address().data(),ZT_ADDRESS_LENGTH);
outpTmpl.append(from.data,6);
outpTmpl.append(mg.mac().data,6);
outpTmpl.append((uint32_t)mg.adi());
outpTmpl.append(newBloom.data(),ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE);
outpTmpl.append((uint8_t)0); // 0 hops
outpTmpl.append((uint16_t)etherType);
outpTmpl.append((uint16_t)len);
outpTmpl.append((uint16_t)signature.length());
outpTmpl.append(data,len);
outpTmpl.append(signature.data(),signature.length());
outpTmpl.compress();
send(outpTmpl,true);
for(unsigned int i=1;i<np;++i) {
outpTmpl.newInitializationVector();
outpTmpl.setDestination(propPeers[i]->address());
send(outpTmpl,true);
}
} else if (to.isZeroTier()) {
// Simple unicast frame from us to another node
Address toZT(to.data + 1);
@ -278,18 +166,9 @@ void Switch::onLocalEthernet(const SharedPtr<Network> &network,const MAC &from,c
void Switch::send(const Packet &packet,bool encrypt)
{
//TRACE("%.16llx %s -> %s (size: %u) (enc: %s)",packet.packetId(),Packet::verbString(packet.verb()),packet.destination().toString().c_str(),packet.size(),(encrypt ? "yes" : "no"));
PacketServiceAttemptResult r = _trySend(packet,encrypt);
if (r != PACKET_SERVICE_ATTEMPT_OK) {
{
Mutex::Lock _l(_txQueue_m);
std::multimap< Address,TXQueueEntry >::iterator qe(_txQueue.insert(std::pair< Address,TXQueueEntry >(packet.destination(),TXQueueEntry())));
qe->second.creationTime = Utils::now();
qe->second.packet = packet;
qe->second.encrypt = encrypt;
}
if (r == PACKET_SERVICE_ATTEMPT_PEER_UNKNOWN)
_requestWhois(packet.destination());
if (!_trySend(packet,encrypt)) {
Mutex::Lock _l(_txQueue_m);
_txQueue.insert(std::pair< uint64_t,TXQueueEntry >(packet.packetId(),TXQueueEntry(Utils::now(),packet,encrypt)));
}
}
@ -432,8 +311,8 @@ unsigned long Switch::doTimerTasks()
{
Mutex::Lock _l(_txQueue_m);
for(std::multimap< Address,TXQueueEntry >::iterator i(_txQueue.begin());i!=_txQueue.end();) {
if (_trySend(i->second.packet,i->second.encrypt) == PACKET_SERVICE_ATTEMPT_OK)
for(std::map< uint64_t,TXQueueEntry >::iterator i(_txQueue.begin());i!=_txQueue.end();) {
if (_trySend(i->second.packet,i->second.encrypt))
_txQueue.erase(i++);
else if ((now - i->second.creationTime) > ZT_TRANSMIT_QUEUE_TIMEOUT) {
TRACE("TX %s -> %s timed out",i->second.packet.source().toString().c_str(),i->second.packet.destination().toString().c_str());
@ -443,8 +322,10 @@ unsigned long Switch::doTimerTasks()
}
{
Mutex::Lock _l(_rxQueue_m);
for(std::multimap< Address,RXQueueEntry >::iterator i(_rxQueue.begin());i!=_rxQueue.end();) {
if ((now - i->second.creationTime) > ZT_RECEIVE_QUEUE_TIMEOUT) {
for(std::map< uint64_t,RXQueueEntry >::iterator i(_rxQueue.begin());i!=_rxQueue.end();) {
if (_tryHandleRemotePacket(i->second.localPort,i->second.fromAddr,i->second.packet))
_rxQueue.erase(i++);
else if ((now - i->second.creationTime) > ZT_RECEIVE_QUEUE_TIMEOUT) {
TRACE("RX from %s timed out waiting for WHOIS",i->second.packet.source().toString().c_str());
_rxQueue.erase(i++);
} else ++i;
@ -499,6 +380,17 @@ void Switch::announceMulticastGroups(const std::map< SharedPtr<Network>,std::set
}
}
void Switch::requestWhois(const Address &addr,const SharedPtr<PacketDecoder> &pd)
{
TRACE("requesting WHOIS for %s",addr.toString().c_str());
_sendWhoisRequest(addr,(const Address *)0,0);
Mutex::Lock _l(_outstandingWhoisRequests_m);
std::pair< std::map< Address,WhoisRequest >::iterator,bool > entry(_outstandingWhoisRequests.insert(std::pair<Address,WhoisRequest>(addr,WhoisRequest())));
entry.first->second.lastSent = Utils::now();
entry.first->second.retries = 0; // reset retry count if entry already existed
entry.first->second.waitingPackets.insert(pd);
}
void Switch::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result)
{
_CBaddPeerFromHello_Data *req = (_CBaddPeerFromHello_Data *)arg;
@ -508,6 +400,8 @@ void Switch::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::Pe
case Topology::PEER_VERIFY_ACCEPTED_NEW:
case Topology::PEER_VERIFY_ACCEPTED_ALREADY_HAVE:
case Topology::PEER_VERIFY_ACCEPTED_DISPLACED_INVALID_ADDRESS: {
req->parent->_finishWhoisRequest(p); // terminate any outstanding WHOIS too
Packet outp(req->source,_r->identity.address(),Packet::VERB_OK);
outp.append((unsigned char)Packet::VERB_HELLO);
outp.append(req->helloPacketId);
@ -516,6 +410,7 @@ void Switch::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::Pe
outp.hmacSet(p->macKey());
req->parent->_r->demarc->send(req->localPort,req->fromAddr,outp.data(),outp.size(),-1);
} break;
case Topology::PEER_VERIFY_REJECTED_INVALID_IDENTITY: {
Packet outp(req->source,_r->identity.address(),Packet::VERB_ERROR);
outp.append((unsigned char)Packet::VERB_HELLO);
@ -525,6 +420,7 @@ void Switch::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::Pe
outp.hmacSet(p->macKey());
req->parent->_r->demarc->send(req->localPort,req->fromAddr,outp.data(),outp.size(),-1);
} break;
case Topology::PEER_VERIFY_REJECTED_DUPLICATE:
case Topology::PEER_VERIFY_REJECTED_DUPLICATE_TRIAGED: {
Packet outp(req->source,_r->identity.address(),Packet::VERB_ERROR);
@ -542,65 +438,180 @@ void Switch::_CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::Pe
void Switch::_CBaddPeerFromWhois(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result)
{
Switch *d = (Switch *)arg;
switch(result) {
case Topology::PEER_VERIFY_ACCEPTED_NEW:
case Topology::PEER_VERIFY_ACCEPTED_ALREADY_HAVE:
case Topology::PEER_VERIFY_ACCEPTED_DISPLACED_INVALID_ADDRESS:
d->_outstandingWhoisRequests_m.lock();
d->_outstandingWhoisRequests.erase(p->identity().address());
d->_outstandingWhoisRequests_m.unlock();
d->_retryPendingFor(p->identity().address());
((Switch *)arg)->_finishWhoisRequest(p);
break;
default:
break;
}
}
void Switch::_propagateMulticast(const SharedPtr<Network> &network,const Address &upstream,const unsigned char *bloom,const MulticastGroup &mg,unsigned int mcHops,const MAC &from,unsigned int etherType,const void *data,unsigned int len)
void Switch::_finishWhoisRequest(
const SharedPtr<Peer> &peer)
{
if (mcHops > ZT_MULTICAST_PROPAGATION_DEPTH)
return;
Multicaster::MulticastBloomFilter newBloom(bloom); // bloom will be NULL if starting fresh
SharedPtr<Peer> propPeers[ZT_MULTICAST_PROPAGATION_BREADTH];
unsigned int np = _multicaster.pickNextPropagationPeers(*(_r->topology),network->id(),mg,upstream,newBloom,ZT_MULTICAST_PROPAGATION_BREADTH,propPeers,Utils::now());
if (!np)
return;
std::string signature(Multicaster::signMulticastPacket(_r->identity,from,mg,etherType,data,len));
if (!signature.length()) {
TRACE("failure signing multicast message!");
return;
}
for(unsigned int i=0;i<np;++i) {
Packet outp(propPeers[i]->address(),_r->identity.address(),Packet::VERB_MULTICAST_FRAME);
outp.append((uint8_t)0);
outp.append((uint64_t)network->id());
outp.append(_r->identity.address().data(),ZT_ADDRESS_LENGTH);
outp.append(from.data,6);
outp.append(mg.mac().data,6);
outp.append((uint32_t)mg.adi());
outp.append(newBloom.data(),ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE);
outp.append((uint8_t)mcHops);
outp.append((uint16_t)etherType);
outp.append((uint16_t)len);
outp.append((uint16_t)signature.length());
outp.append(data,len);
outp.append(signature.data(),signature.length());
outp.compress();
send(outp,true);
Mutex::Lock _l(_outstandingWhoisRequests_m);
std::map< Address,WhoisRequest >::iterator wr(_outstandingWhoisRequests.find(peer->address()));
if (wr != _outstandingWhoisRequests.end()) {
for(std::set<uint64_t>::iterator pid(wr->second.waitingPackets.begin());pid!=wr->second.waitingPackets.end();++pid) {
{
Mutex::Lock _l(_txQueue_m);
std::map< uint64_t,TXQueueEntry >::iterator txitem(_txQueue.find(*pid));
if (txitem != _txQueue.end()) {
if (_trySend(txitem->second.packet,txitem->second.encrypt))
_txQueue.erase(txitem);
}
}
{
Mutex::Lock _l(_rxQueue_m);
std::map< uint64_t,RXQueueEntry >::iterator rxitem(_rxQueue.find(*pid));
if (rxitem != _rxQueue.end()) {
if (_tryHandleRemotePacket(rxitem->second.localPort,rxitem->second.fromAddr,rxitem->second.packet))
_rxQueue.erase(rxitem);
}
}
}
_outstandingWhoisRequests.erase(wr);
}
}
Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port localPort,const InetAddress &fromAddr,Packet &packet)
void Switch::_handleRemotePacketFragment(Demarc::Port localPort,const InetAddress &fromAddr,const Buffer<4096> &data)
{
Packet::Fragment fragment(data);
Address destination(fragment.destination());
if (destination != _r->identity.address()) {
// Fragment is not for us, so try to relay it
if (fragment.hops() < ZT_RELAY_MAX_HOPS) {
fragment.incrementHops();
SharedPtr<Peer> relayTo = _r->topology->getPeer(destination);
if ((!relayTo)||(!relayTo->send(_r,fragment.data(),fragment.size(),true,Packet::VERB_NOP,Utils::now()))) {
relayTo = _r->topology->getBestSupernode();
if (relayTo)
relayTo->send(_r,fragment.data(),fragment.size(),true,Packet::VERB_NOP,Utils::now());
}
} else {
TRACE("dropped relay [fragment](%s) -> %s, max hops exceeded",fromAddr.toString().c_str(),destination.toString().c_str());
}
} else {
// Fragment looks like ours
uint64_t pid = fragment.packetId();
unsigned int fno = fragment.fragmentNumber();
unsigned int tf = fragment.totalFragments();
if ((tf <= ZT_MAX_PACKET_FRAGMENTS)&&(fno < ZT_MAX_PACKET_FRAGMENTS)&&(fno > 0)&&(tf > 1)) {
// Fragment appears basically sane. Its fragment number must be
// 1 or more, since a Packet with fragmented bit set is fragment 0.
// Total fragments must be more than 1, otherwise why are we
// seeing a Packet::Fragment?
Mutex::Lock _l(_defragQueue_m);
std::map< uint64_t,DefragQueueEntry >::iterator dqe(_defragQueue.find(pid));
if (dqe == _defragQueue.end()) {
// We received a Packet::Fragment without its head, so queue it and wait
DefragQueueEntry &dq = _defragQueue[pid];
dq.creationTime = Utils::now();
dq.frags[fno - 1] = fragment;
dq.totalFragments = tf; // total fragment count is known
dq.haveFragments = 1 << fno; // we have only this fragment
//TRACE("fragment (%u/%u) of %.16llx from %s",fno + 1,tf,pid,fromAddr.toString().c_str());
} else if (!(dqe->second.haveFragments & (1 << fno))) {
// We have other fragments and maybe the head, so add this one and check
dqe->second.frags[fno - 1] = fragment;
dqe->second.totalFragments = tf;
//TRACE("fragment (%u/%u) of %.16llx from %s",fno + 1,tf,pid,fromAddr.toString().c_str());
if (Utils::countBits(dqe->second.haveFragments |= (1 << fno)) == tf) {
// We have all fragments -- assemble and process full Packet
//TRACE("packet %.16llx is complete, assembling and processing...",pid);
Packet packet(dqe->second.frag0);
for(unsigned int f=1;f<tf;++f)
packet.append(dqe->second.frags[f - 1].payload(),dqe->second.frags[f - 1].payloadLength());
_defragQueue.erase(dqe);
_handleRemotePacket(localPort,fromAddr,packet);
}
} // else this is a duplicate fragment, ignore
}
}
}
bool Switch::_handleRemotePacketHead(Demarc::Port localPort,const InetAddress &fromAddr,const Buffer<4096> &data)
{
Packet packet(data);
Address destination(packet.destination());
if (destination != _r->identity.address()) {
// Packet is not for us, so try to relay it
if (packet.hops() < ZT_RELAY_MAX_HOPS) {
packet.incrementHops();
SharedPtr<Peer> relayTo = _r->topology->getPeer(destination);
if ((relayTo)&&(relayTo->send(_r,packet.data(),packet.size(),true,Packet::VERB_NOP,Utils::now()))) {
// TODO: don't unite immediately, wait until the peers have exchanged a packet or two
unite(packet.source(),destination,false); // periodically try to get them to talk directly
} else {
relayTo = _r->topology->getBestSupernode();
if (relayTo)
relayTo->send(_r,packet.data(),packet.size(),true,Packet::VERB_NOP,Utils::now());
}
} else {
TRACE("dropped relay %s(%s) -> %s, max hops exceeded",packet.source().toString().c_str(),fromAddr.toString().c_str(),destination.toString().c_str());
}
} else if (packet.fragmented()) {
// Packet is the head of a fragmented packet series
uint64_t pid = packet.packetId();
Mutex::Lock _l(_defragQueue_m);
std::map< uint64_t,DefragQueueEntry >::iterator dqe(_defragQueue.find(pid));
if (dqe == _defragQueue.end()) {
// If we have no other fragments yet, create an entry and save the head
DefragQueueEntry &dq = _defragQueue[pid];
dq.creationTime = Utils::now();
dq.frag0 = packet;
dq.totalFragments = 0; // 0 == unknown, waiting for Packet::Fragment
dq.haveFragments = 1; // head is first bit (left to right)
//TRACE("fragment (0/?) of %.16llx from %s",pid,fromAddr.toString().c_str());
} else if (!(dqe->second.haveFragments & 1)) {
// If we have other fragments but no head, see if we are complete with the head
if ((dqe->second.totalFragments)&&(Utils::countBits(dqe->second.haveFragments |= 1) == dqe->second.totalFragments)) {
// We have all fragments -- assemble and process full Packet
//TRACE("packet %.16llx is complete, assembling and processing...",pid);
// packet already contains head, so append fragments
for(unsigned int f=1;f<dqe->second.totalFragments;++f)
packet.append(dqe->second.frags[f - 1].payload(),dqe->second.frags[f - 1].payloadLength());
_defragQueue.erase(dqe);
_handleRemotePacket(localPort,fromAddr,packet);
} else {
// Still waiting on more fragments, so queue the head
dqe->second.frag0 = packet;
}
} // else this is a duplicate head, ignore
} else {
// Packet is unfragmented, so just process it
_handleRemotePacket(localPort,fromAddr,packet);
}
}
//////////////////// OBSOLETE
bool Switch::_tryHandleRemotePacket(Demarc::Port localPort,const InetAddress &fromAddr,Packet &packet)
{
// NOTE: We assume any packet that's made it here is for us. If it's not it
// will fail HMAC validation and be discarded anyway, amounting to a second
// layer of sanity checking.
Address source(packet.source());
@ -610,7 +621,7 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
// a HELLO for someone for whom we don't have a Peer record.
TRACE("HELLO from %s(%s)",source.toString().c_str(),fromAddr.toString().c_str());
_doHELLO(localPort,fromAddr,packet);
return PACKET_SERVICE_ATTEMPT_OK;
return true;
}
SharedPtr<Peer> peer = _r->topology->getPeer(source);
@ -620,23 +631,29 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
if (!packet.hmacVerify(peer->macKey())) {
TRACE("dropped packet from %s(%s), HMAC authentication failed (size: %u)",source.toString().c_str(),fromAddr.toString().c_str(),packet.size());
return PACKET_SERVICE_ATTEMPT_OK;
return true;
}
if (packet.encrypted()) {
packet.decrypt(peer->cryptKey());
} else if (packet.verb() != Packet::VERB_NOP) {
TRACE("ODD: %s from %s wasn't encrypted",Packet::verbString(packet.verb()),source.toString().c_str());
} else {
// Unencrypted is tolerated in case we want to run this on
// devices where squeezing out cycles matters. HMAC is
// what's really important.
TRACE("ODD: %s from %s(%s) wasn't encrypted",Packet::verbString(packet.verb()),source.toString().c_str(),fromAddr.toString().c_str());
}
if (!packet.uncompress()) {
TRACE("dropped packet from %s(%s), compressed data invalid",source.toString().c_str(),fromAddr.toString().c_str());
return PACKET_SERVICE_ATTEMPT_OK;
return true;
}
switch(packet.verb()) {
case Packet::VERB_NOP: // these are sent for NAT-t
TRACE("NOP from %s(%s) (probably NAT-t)",source.toString().c_str(),fromAddr.toString().c_str());
case Packet::VERB_NOP:
TRACE("NOP from %s(%s)",source.toString().c_str(),fromAddr.toString().c_str());
break;
case Packet::VERB_HELLO: // usually they're handled up top, but technically an encrypted HELLO is legal
case Packet::VERB_HELLO:
// HELLO is normally handled up top, but this is legal. Pointless, but legal.
_doHELLO(localPort,fromAddr,packet);
break;
case Packet::VERB_ERROR:
@ -644,13 +661,17 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
#ifdef ZT_TRACE
Packet::Verb inReVerb = (Packet::Verb)packet[ZT_PROTO_VERB_ERROR_IDX_IN_RE_VERB];
Packet::ErrorCode errorCode = (Packet::ErrorCode)packet[ZT_PROTO_VERB_ERROR_IDX_ERROR_CODE];
TRACE("ERROR %s from %s in-re %s",Packet::errorString(errorCode),source.toString().c_str(),Packet::verbString(inReVerb));
TRACE("ERROR %s from %s(%s) in-re %s",Packet::errorString(errorCode),source.toString().c_str(),fromAddr.toString().c_str(),Packet::verbString(inReVerb));
#endif
// TODO: handle key errors, such as duplicate identity
// TODO:
// The fact is that the protocol works fine without error handling.
// The only error that really needs to be handled here is duplicate
// identity collision, which if it comes from a supernode should cause
// us to restart and regenerate a new identity.
} catch (std::exception &ex) {
TRACE("dropped ERROR from %s: unexpected exception: %s",source.toString().c_str(),ex.what());
TRACE("dropped ERROR from %s(%s): unexpected exception: %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped ERROR from %s: unexpected exception: (unknown)",source.toString().c_str());
TRACE("dropped ERROR from %s(%s): unexpected exception: (unknown)",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
case Packet::VERB_OK:
@ -658,8 +679,9 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
Packet::Verb inReVerb = (Packet::Verb)packet[ZT_PROTO_VERB_OK_IDX_IN_RE_VERB];
switch(inReVerb) {
case Packet::VERB_HELLO:
// OK from HELLO permits computation of latency.
latency = std::min((unsigned int)(now - packet.at<uint64_t>(ZT_PROTO_VERB_HELLO__OK__IDX_TIMESTAMP)),(unsigned int)0xffff);
TRACE("OK(HELLO), latency to %s: %u",source.toString().c_str(),latency);
TRACE("%s(%s): OK(HELLO), latency: %u",source.toString().c_str(),fromAddr.toString().c_str(),latency);
break;
case Packet::VERB_WHOIS:
// Right now we only query supernodes for WHOIS and only accept
@ -667,19 +689,21 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
// do something to prevent WHOIS cache poisoning such as
// using the packet ID field in the OK packet to match with the
// original query. Technically we should be doing this anyway.
TRACE("%s(%s): OK(%s)",source.toString().c_str(),fromAddr.toString().c_str(),Packet::verbString(inReVerb));
if (_r->topology->isSupernode(source))
_r->topology->addPeer(SharedPtr<Peer>(new Peer(_r->identity,Identity(packet,ZT_PROTO_VERB_WHOIS__OK__IDX_IDENTITY))),&Switch::_CBaddPeerFromWhois,this);
break;
default:
TRACE("%s(%s): OK(%s)",source.toString().c_str(),fromAddr.toString().c_str(),Packet::verbString(inReVerb));
break;
}
} catch (std::exception &ex) {
TRACE("dropped OK from %s: unexpected exception: %s",source.toString().c_str(),ex.what());
TRACE("dropped OK from %s(%s): unexpected exception: %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped OK from %s: unexpected exception: (unknown)",source.toString().c_str());
TRACE("dropped OK from %s(%s): unexpected exception: (unknown)",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
case Packet::VERB_WHOIS: {
case Packet::VERB_WHOIS:
if (packet.payloadLength() == ZT_ADDRESS_LENGTH) {
SharedPtr<Peer> p(_r->topology->getPeer(Address(packet.payload())));
if (p) {
@ -703,9 +727,9 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
TRACE("sent WHOIS ERROR to %s for %s (not found)",source.toString().c_str(),Address(packet.payload()).toString().c_str());
}
} else {
TRACE("dropped WHOIS from %s: missing or invalid address",source.toString().c_str());
TRACE("dropped WHOIS from %s(%s): missing or invalid address",source.toString().c_str(),fromAddr.toString().c_str());
}
} break;
break;
case Packet::VERB_RENDEZVOUS:
try {
Address with(packet.field(ZT_PROTO_VERB_RENDEZVOUS_IDX_ZTADDRESS,ZT_ADDRESS_LENGTH));
@ -724,15 +748,15 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
_rendezvousQueue[with] = qe;
}
} else {
TRACE("dropped corrupt RENDEZVOUS from %s (bad address or port)",source.toString().c_str());
TRACE("dropped corrupt RENDEZVOUS from %s(%s) (bad address or port)",source.toString().c_str(),fromAddr.toString().c_str());
}
} else {
TRACE("ignored RENDEZVOUS from %s for unknown peer %s",source.toString().c_str(),with.toString().c_str());
TRACE("ignored RENDEZVOUS from %s(%s) to meet unknown peer %s",source.toString().c_str(),fromAddr.toString().c_str(),with.toString().c_str());
}
} catch (std::exception &ex) {
TRACE("dropped RENDEZVOUS from %s: %s",source.toString().c_str(),ex.what());
TRACE("dropped RENDEZVOUS from %s(%s): %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped RENDEZVOUS from %s: unexpected exception",source.toString().c_str());
TRACE("dropped RENDEZVOUS from %s(%s): unexpected exception",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
case Packet::VERB_FRAME:
@ -747,21 +771,23 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
network->tap().put(source.toMAC(),network->tap().mac(),etherType,packet.data() + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD,packet.size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD);
}
} else {
TRACE("dropped FRAME from %s: not a member of closed network %llu",source.toString().c_str(),network->id());
TRACE("dropped FRAME from %s(%s): not a member of closed network %llu",source.toString().c_str(),fromAddr.toString().c_str(),network->id());
}
} else {
TRACE("dropped FRAME from %s: network %llu unknown",source.toString().c_str(),packet.at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
TRACE("dropped FRAME from %s(%s): network %llu unknown",source.toString().c_str(),fromAddr.toString().c_str(),packet.at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
}
} catch (std::exception &ex) {
TRACE("dropped FRAME from %s: unexpected exception: %s",source.toString().c_str(),ex.what());
TRACE("dropped FRAME from %s(%s): unexpected exception: %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped FRAME from %s: unexpected exception: (unknown)",source.toString().c_str());
TRACE("dropped FRAME from %s(%s): unexpected exception: (unknown)",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
case Packet::VERB_MULTICAST_LIKE:
try {
unsigned int ptr = ZT_PACKET_IDX_PAYLOAD;
unsigned int numAccepted = 0;
// Iterate through 18-byte network,MAC,ADI tuples:
while ((ptr + 18) <= packet.size()) {
uint64_t nwid = packet.at<uint64_t>(ptr); ptr += 8;
SharedPtr<Network> network(_r->nc->network(nwid));
@ -773,10 +799,10 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
_multicaster.likesMulticastGroup(nwid,MulticastGroup(mac,adi),source,now);
++numAccepted;
} else {
TRACE("ignored MULTICAST_LIKE from %s: not a member of closed network %llu",source.toString().c_str(),nwid);
TRACE("ignored MULTICAST_LIKE from %s(%s): not a member of closed network %llu",source.toString().c_str(),fromAddr.toString().c_str(),nwid);
}
} else {
TRACE("ignored MULTICAST_LIKE from %s: network %llu unknown",source.toString().c_str(),nwid);
TRACE("ignored MULTICAST_LIKE from %s(%s): network %llu unknown or we are not a member",source.toString().c_str(),fromAddr.toString().c_str(),nwid);
}
}
@ -788,9 +814,9 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
outp.hmacSet(peer->macKey());
_r->demarc->send(localPort,fromAddr,outp.data(),outp.size(),-1);
} catch (std::exception &ex) {
TRACE("dropped MULTICAST_LIKE from %s: unexpected exception: %s",source.toString().c_str(),ex.what());
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped MULTICAST_LIKE from %s: unexpected exception: (unknown)",source.toString().c_str());
TRACE("dropped MULTICAST_LIKE from %s(%s): unexpected exception: (unknown)",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
case Packet::VERB_MULTICAST_FRAME:
@ -800,68 +826,75 @@ Switch::PacketServiceAttemptResult Switch::_tryHandleRemotePacket(Demarc::Port l
if (network->isAllowed(source)) {
if (packet.size() > ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD) {
Address originalSubmitterAddress(packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SUBMITTER_ADDRESS,ZT_ADDRESS_LENGTH));
MAC fromMac(packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,6));
MulticastGroup mg(MAC(packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DESTINATION_MAC,6)),packet.at<uint32_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ADI));
unsigned int hops = packet[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_HOP_COUNT];
unsigned int etherType = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE);
unsigned int datalen = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD_LENGTH);
unsigned int signaturelen = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SIGNATURE_LENGTH);
unsigned char *dataAndSignature = packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD,datalen + signaturelen);
bool isDuplicate = _multicaster.checkAndUpdateMulticastHistory(fromMac,mg,payload,payloadLen,network->id(),now);
if (originalSubmitterAddress == _r->identity.address()) {
TRACE("dropped boomerang MULTICAST_FRAME received from %s",source.toString().c_str());
} else {
// Technically should not happen, since the original submitter is
// excluded from consideration as a propagation recipient.
TRACE("dropped boomerang MULTICAST_FRAME received from %s(%s)",source.toString().c_str(),fromAddr.toString().c_str());
} else if ((!isDuplicate)||(_r->topology.isSupernode(_r->identity.address()))) {
// If I am a supernode, I will repeatedly propagate duplicates. That's
// because supernodes are used to bridge sparse multicast groups. Non-
// supernodes will ignore duplicates completely.
SharedPtr<Peer> originalSubmitter(_r->topology->getPeer(originalSubmitterAddress));
if (!originalSubmitter) {
// If we don't know the original submitter, try to look them up
// and abort.
// TODO: need to rearchitect how we wait for and handle whois
// responses so they trigger a re-eval of this packet instantly.
_requestWhois(originalSubmitterAddress);
return PACKET_SERVICE_ATTEMPT_PEER_UNKNOWN;
TRACE("requesting WHOIS on original multicast frame submitter %s",originalSubmitterAddress.toString().c_str());
_requestWhois(originalSubmitterAddress,packet.packetId());
return false;
} else if (Multicaster::verifyMulticastPacket(originalSubmitter->identity(),fromMac,mg,etherType,data,datalen,dataAndSignature + datalen,signaturelen)) {
if (!isDuplicate)
network->tap().put(fromMac,mg.mac(),etherType,payload,payloadLen);
_propagateMulticast(network,originalSubmitterAddress,source,packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_BLOOM,ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE),mg,hops+1,fromMac,etherType,payload,payloadLen);
} else {
MAC fromMac(packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SOURCE_MAC,6));
MulticastGroup mg(MAC(packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_DESTINATION_MAC,6)),packet.at<uint32_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ADI));
unsigned int hops = packet[ZT_PROTO_VERB_MULTICAST_FRAME_IDX_HOP_COUNT];
unsigned int etherType = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_ETHERTYPE);
unsigned int datalen = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD_LENGTH);
unsigned int signaturelen = packet.at<uint16_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_SIGNATURE_LENGTH);
unsigned char *dataAndSignature = packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PAYLOAD,datalen + signaturelen);
if (Multicaster::verifyMulticastPacket(originalSubmitter->identity(),fromMac,mg,etherType,data,datalen,dataAndSignature + datalen,signaturelen)) {
if (network->isAllowed(originalSubmitterAddress)) {
if (_multicaster.checkAndUpdateMulticastHistory(fromMac,mg,payload,payloadLen,network->id(),now)) {
// TODO: check if allowed etherType
network->tap().put(fromMac,mg.mac(),etherType,payload,payloadLen);
} else {
}
_propagateMulticast(network,source,packet.field(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_BLOOM,ZT_PROTO_VERB_MULTICAST_FRAME_BLOOM_FILTER_SIZE),mg,hops+1,fromMac,etherType,payload,payloadLen);
} else {
}
} else {
}
LOG("rejected MULTICAST_FRAME from %s(%s) due to failed signature check (claims original sender %s)",source.toString().c_str(),fromAddr.toString().c_str(),originalSubmitterAddress.toString().c_str());
}
} else {
TRACE("dropped redundant MULTICAST_FRAME from %s(%s)",source.toString().c_str(),fromAddr.toString().c_str());
}
} else {
TRACE("dropped MULTICAST_FRAME from %s(%s): invalid short packet",source.toString().c_str(),fromAddr.toString().c_str());
}
} else {
TRACE("dropped MULTICAST_FRAME from %s: not a member of closed network %llu",source.toString().c_str(),network->id());
TRACE("dropped MULTICAST_FRAME from %s(%s): not a member of closed network %llu",source.toString().c_str(),fromAddr.toString().c_str(),network->id());
}
} else {
TRACE("dropped MULTICAST_FRAME from %s: network %llu unknown or we are not a member",source.toString().c_str(),packet.at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID));
TRACE("dropped MULTICAST_FRAME from %s(%s): network %llu unknown or we are not a member",source.toString().c_str(),fromAddr.toString().c_str(),packet.at<uint64_t>(ZT_PROTO_VERB_MULTICAST_FRAME_IDX_NETWORK_ID));
}
} catch (std::exception &ex) {
TRACE("dropped MULTICAST_FRAME from %s: unexpected exception: %s",source.toString().c_str(),ex.what());
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: %s",source.toString().c_str(),fromAddr.toString().c_str(),ex.what());
} catch ( ... ) {
TRACE("dropped MULTICAST_FRAME from %s: unexpected exception: (unknown)",source.toString().c_str());
TRACE("dropped MULTICAST_FRAME from %s(%s): unexpected exception: (unknown)",source.toString().c_str(),fromAddr.toString().c_str());
}
break;
break;
default:
TRACE("ignored unrecognized verb %.2x from %s",(unsigned int)packet.verb(),source.toString().c_str());
// This might be something from a new or old version of the protocol.
// Technically it passed HMAC so the packet is still valid, but we
// ignore it.
TRACE("ignored unrecognized verb %.2x from %s(%s)",(unsigned int)packet.verb(),source.toString().c_str(),fromAddr.toString().c_str());
break;
}
// Update peer timestamps and learn new links
// Update peer timestamps and learn new links. This must only ever
// be called on an authenticated and technically valid packet, since
// we only learn paths to peers over the WAN by hearing directly
// from them over those paths. (Or by having them authoritatively
// and statically defined, like with supernodes, but that's done
// elsewhere.)
peer->onReceive(_r,localPort,fromAddr,latency,packet.hops(),packet.verb(),now);
} else {
_requestWhois(source);
return PACKET_SERVICE_ATTEMPT_PEER_UNKNOWN;
_requestWhois(source,packet.packetId());
return false;
}
return PACKET_SERVICE_ATTEMPT_OK;
return true;
}
void Switch::_doHELLO(Demarc::Port localPort,const InetAddress &fromAddr,Packet &packet)
@ -948,16 +981,6 @@ void Switch::_doHELLO(Demarc::Port localPort,const InetAddress &fromAddr,Packet
}
}
void Switch::_requestWhois(const Address &addr)
{
TRACE("requesting WHOIS for %s",addr.toString().c_str());
_sendWhoisRequest(addr,(const Address *)0,0);
Mutex::Lock _l(_outstandingWhoisRequests_m);
std::pair< std::map< Address,WhoisRequest >::iterator,bool > entry(_outstandingWhoisRequests.insert(std::pair<Address,WhoisRequest>(addr,WhoisRequest())));
entry.first->second.lastSent = Utils::now();
entry.first->second.retries = 0; // reset retry count if entry already existed
}
Address Switch::_sendWhoisRequest(const Address &addr,const Address *peersAlreadyConsulted,unsigned int numPeersAlreadyConsulted)
{
SharedPtr<Peer> supernode(_r->topology->getBestSupernode(peersAlreadyConsulted,numPeersAlreadyConsulted));
@ -972,7 +995,7 @@ Address Switch::_sendWhoisRequest(const Address &addr,const Address *peersAlread
return Address();
}
Switch::PacketServiceAttemptResult Switch::_trySend(const Packet &packet,bool encrypt)
bool Switch::_trySend(const Packet &packet,bool encrypt)
{
SharedPtr<Peer> peer(_r->topology->getPeer(packet.destination()));
if (peer) {
@ -987,7 +1010,7 @@ Switch::PacketServiceAttemptResult Switch::_trySend(const Packet &packet,bool en
isRelay = true;
via = _r->topology->getBestSupernode();
if (!via)
return PACKET_SERVICE_ATTEMPT_SEND_FAILED;
return false;
}
Packet tmp(packet);
@ -1015,40 +1038,20 @@ Switch::PacketServiceAttemptResult Switch::_trySend(const Packet &packet,bool en
Packet::Fragment frag(tmp,fragStart,chunkSize,f + 1,totalFragments);
if (!via->send(_r,frag.data(),frag.size(),isRelay,verb,now)) {
TRACE("WARNING: packet send to %s failed on later fragment #%u (check IP layer buffer sizes?)",via->address().toString().c_str(),f + 1);
return PACKET_SERVICE_ATTEMPT_SEND_FAILED;
return false;
}
fragStart += chunkSize;
remaining -= chunkSize;
}
}
return PACKET_SERVICE_ATTEMPT_OK;
return true;
}
return PACKET_SERVICE_ATTEMPT_SEND_FAILED;
return false;
}
return PACKET_SERVICE_ATTEMPT_PEER_UNKNOWN;
}
void Switch::_retryPendingFor(const Address &addr)
{
{
Mutex::Lock _l(_txQueue_m);
std::pair< std::multimap< Address,TXQueueEntry >::iterator,std::multimap< Address,TXQueueEntry >::iterator > eqrange = _txQueue.equal_range(addr);
for(std::multimap< Address,TXQueueEntry >::iterator i(eqrange.first);i!=eqrange.second;) {
if (_trySend(i->second.packet,i->second.encrypt) == PACKET_SERVICE_ATTEMPT_OK)
_txQueue.erase(i++);
else ++i;
}
}
{
Mutex::Lock _l(_rxQueue_m);
std::pair< std::multimap< Address,RXQueueEntry >::iterator,std::multimap< Address,RXQueueEntry >::iterator > eqrange = _rxQueue.equal_range(addr);
for(std::multimap< Address,RXQueueEntry >::iterator i(eqrange.first);i!=eqrange.second;) {
if (_tryHandleRemotePacket(i->second.localPort,i->second.fromAddr,i->second.packet) == PACKET_SERVICE_ATTEMPT_OK)
_rxQueue.erase(i++);
else ++i;
}
}
_requestWhois(packet.destination(),packet.packetId());
return false;
}
} // namespace ZeroTier

80
node/Switch.hpp
View File

@ -150,15 +150,15 @@ public:
*/
void announceMulticastGroups(const std::map< SharedPtr<Network>,std::set<MulticastGroup> > &allMemberships);
private:
// Returned by _send() and _processRemotePacket() to indicate what happened
enum PacketServiceAttemptResult
{
PACKET_SERVICE_ATTEMPT_OK,
PACKET_SERVICE_ATTEMPT_PEER_UNKNOWN,
PACKET_SERVICE_ATTEMPT_SEND_FAILED
};
/**
* Request WHOIS on a given address
*
* @param addr Address to look up
* @param pd Packet decoder to link to request or NULL for none
*/
void requestWhois(const Address &addr,const SharedPtr<PacketDecoder> &pd);
private:
struct _CBaddPeerFromHello_Data
{
Switch *parent;
@ -169,19 +169,44 @@ private:
uint64_t helloPacketId;
uint64_t helloTimestamp;
};
static void _CBaddPeerFromHello(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result);
static void _CBaddPeerFromWhois(void *arg,const SharedPtr<Peer> &p,Topology::PeerVerifyResult result); // arg == this
static void _CBaddPeerFromHello(
void *arg, // _CBaddPeerFromHello_Data
const SharedPtr<Peer> &p,
Topology::PeerVerifyResult result);
void _propagateMulticast(const SharedPtr<Network> &network,const Address &upstream,const unsigned char *bloom,const MulticastGroup &mg,unsigned int mcHops,const MAC &from,unsigned int etherType,const void *data,unsigned int len);
PacketServiceAttemptResult _tryHandleRemotePacket(Demarc::Port localPort,const InetAddress &fromAddr,Packet &packet);
void _doHELLO(Demarc::Port localPort,const InetAddress &fromAddr,Packet &packet);
void _requestWhois(const Address &addr);
Address _sendWhoisRequest(const Address &addr,const Address *peersAlreadyConsulted,unsigned int numPeersAlreadyConsulted);
PacketServiceAttemptResult _trySend(const Packet &packet,bool encrypt);
void _retryPendingFor(const Address &addr);
static void _CBaddPeerFromWhois(
void *arg, // this (Switch)
const SharedPtr<Peer> &p,
Topology::PeerVerifyResult result);
void _finishWhoisRequest(
const SharedPtr<Peer> &peer);
void _handleRemotePacketFragment(
Demarc::Port localPort,
const InetAddress &fromAddr,
const Buffer<4096> &data);
void _handleRemotePacketHead(
Demarc::Port localPort,
const InetAddress &fromAddr,
const Buffer<4096> &data);
void _doHELLO(
Demarc::Port localPort,
const InetAddress &fromAddr,
Packet &packet);
Address _sendWhoisRequest(
const Address &addr,
const Address *peersAlreadyConsulted,
unsigned int numPeersAlreadyConsulted);
bool _trySend(
const Packet &packet,
bool encrypt);
const RuntimeEnvironment *const _r;
Multicaster _multicaster;
struct WhoisRequest
@ -189,29 +214,26 @@ private:
uint64_t lastSent;
Address peersConsulted[ZT_MAX_WHOIS_RETRIES]; // by retry
unsigned int retries; // 0..ZT_MAX_WHOIS_RETRIES
std::set< SharedPtr<PacketDecoder> > waitingPackets;
};
std::map< Address,WhoisRequest > _outstandingWhoisRequests;
Mutex _outstandingWhoisRequests_m;
struct TXQueueEntry
{
TXQueueEntry() {}
TXQueueEntry(uint64_t ct,const Packet &p,bool enc) :
creationTime(ct),
packet(p),
encrypt(enc) {}
uint64_t creationTime;
Packet packet; // unencrypted/untagged for TX queue
bool encrypt;
};
std::multimap< Address,TXQueueEntry > _txQueue; // by destination address
std::map< uint64_t,TXQueueEntry > _txQueue;
Mutex _txQueue_m;
struct RXQueueEntry
{
uint64_t creationTime;
Demarc::Port localPort;
Packet packet; // encrypted/tagged
InetAddress fromAddr;
};
std::multimap< Address,RXQueueEntry > _rxQueue; // by source address
Mutex _rxQueue_m;
struct DefragQueueEntry
{
uint64_t creationTime;