ZeroTierOne/node/OutboundMulticast.cpp

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/*
* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
* 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/>.
*/
#include "Constants.hpp"
#include "RuntimeEnvironment.hpp"
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#include "OutboundMulticast.hpp"
#include "Switch.hpp"
#include "Network.hpp"
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#include "Node.hpp"
#include "Peer.hpp"
#include "Topology.hpp"
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namespace ZeroTier {
void OutboundMulticast::init(
const RuntimeEnvironment *RR,
uint64_t timestamp,
uint64_t nwid,
unsigned int limit,
unsigned int gatherLimit,
const MAC &src,
const MulticastGroup &dest,
unsigned int etherType,
const void *payload,
unsigned int len)
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{
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uint8_t flags = 0;
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_timestamp = timestamp;
_nwid = nwid;
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if (src) {
_macSrc = src;
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flags |= 0x04;
} else {
_macSrc.fromAddress(RR->identity.address(),nwid);
}
_macDest = dest.mac();
_limit = limit;
_frameLen = (len < ZT_MAX_MTU) ? len : ZT_MAX_MTU;
_etherType = etherType;
if (gatherLimit) flags |= 0x02;
/*
TRACE(">>MC %.16llx INIT %.16llx/%s limit %u gatherLimit %u from %s to %s length %u",
(unsigned long long)this,
nwid,
dest.toString().c_str(),
limit,
gatherLimit,
(src) ? src.toString().c_str() : MAC(RR->identity.address(),nwid).toString().c_str(),
dest.toString().c_str(),
len);
*/
_packet.setSource(RR->identity.address());
_packet.setVerb(Packet::VERB_MULTICAST_FRAME);
_packet.append((uint64_t)nwid);
_packet.append(flags);
if (gatherLimit) _packet.append((uint32_t)gatherLimit);
if (src) src.appendTo(_packet);
dest.mac().appendTo(_packet);
_packet.append((uint32_t)dest.adi());
_packet.append((uint16_t)etherType);
_packet.append(payload,_frameLen);
_packet.compress();
memcpy(_frameData,payload,_frameLen);
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}
void OutboundMulticast::sendOnly(const RuntimeEnvironment *RR,const Address &toAddr)
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{
const SharedPtr<Network> nw(RR->node->network(_nwid));
if ((nw)&&(nw->filterOutgoingPacket(true,RR->identity.address(),toAddr,_macSrc,_macDest,_frameData,_frameLen,_etherType,0))) {
//TRACE(">>MC %.16llx -> %s",(unsigned long long)this,toAddr.toString().c_str());
_packet.newInitializationVector();
_packet.setDestination(toAddr);
RR->sw->send(_packet,true);
}
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}
} // namespace ZeroTier