mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-22 06:17:48 +00:00
396 lines
12 KiB
C++
396 lines
12 KiB
C++
/*
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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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*
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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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#include <algorithm>
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#include "Constants.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "SharedPtr.hpp"
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#include "Multicaster.hpp"
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#include "Topology.hpp"
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#include "Switch.hpp"
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#include "Packet.hpp"
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#include "Peer.hpp"
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#include "C25519.hpp"
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#include "CertificateOfMembership.hpp"
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#include "Node.hpp"
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namespace ZeroTier {
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Multicaster::Multicaster(const RuntimeEnvironment *renv) :
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RR(renv),
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_groups(256),
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_gatherAuth(256)
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{
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}
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Multicaster::~Multicaster()
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{
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}
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void Multicaster::addMultiple(void *tPtr,uint64_t now,uint64_t nwid,const MulticastGroup &mg,const void *addresses,unsigned int count,unsigned int totalKnown)
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{
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const unsigned char *p = (const unsigned char *)addresses;
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const unsigned char *e = p + (5 * count);
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Mutex::Lock _l(_groups_m);
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MulticastGroupStatus &gs = _groups[Multicaster::Key(nwid,mg)];
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while (p != e) {
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_add(tPtr,now,nwid,mg,gs,Address(p,5));
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p += 5;
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}
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}
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void Multicaster::remove(uint64_t nwid,const MulticastGroup &mg,const Address &member)
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{
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Mutex::Lock _l(_groups_m);
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MulticastGroupStatus *s = _groups.get(Multicaster::Key(nwid,mg));
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if (s) {
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for(std::vector<MulticastGroupMember>::iterator m(s->members.begin());m!=s->members.end();++m) {
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if (m->address == member) {
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s->members.erase(m);
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break;
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}
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}
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}
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}
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unsigned int Multicaster::gather(const Address &queryingPeer,uint64_t nwid,const MulticastGroup &mg,Buffer<ZT_PROTO_MAX_PACKET_LENGTH> &appendTo,unsigned int limit) const
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{
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unsigned char *p;
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unsigned int added = 0,i,k,rptr,totalKnown = 0;
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uint64_t a,picked[(ZT_PROTO_MAX_PACKET_LENGTH / 5) + 2];
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if (!limit)
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return 0;
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else if (limit > 0xffff)
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limit = 0xffff;
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const unsigned int totalAt = appendTo.size();
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appendTo.addSize(4); // sizeof(uint32_t)
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const unsigned int addedAt = appendTo.size();
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appendTo.addSize(2); // sizeof(uint16_t)
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{ // Return myself if I am a member of this group
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SharedPtr<Network> network(RR->node->network(nwid));
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if ((network)&&(network->subscribedToMulticastGroup(mg,true))) {
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RR->identity.address().appendTo(appendTo);
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++totalKnown;
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++added;
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}
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}
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Mutex::Lock _l(_groups_m);
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const MulticastGroupStatus *s = _groups.get(Multicaster::Key(nwid,mg));
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if ((s)&&(!s->members.empty())) {
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totalKnown += (unsigned int)s->members.size();
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// Members are returned in random order so that repeated gather queries
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// will return different subsets of a large multicast group.
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k = 0;
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while ((added < limit)&&(k < s->members.size())&&((appendTo.size() + ZT_ADDRESS_LENGTH) <= ZT_UDP_DEFAULT_PAYLOAD_MTU)) {
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rptr = (unsigned int)RR->node->prng();
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restart_member_scan:
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a = s->members[rptr % (unsigned int)s->members.size()].address.toInt();
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for(i=0;i<k;++i) {
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if (picked[i] == a) {
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++rptr;
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goto restart_member_scan;
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}
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}
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picked[k++] = a;
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if (queryingPeer.toInt() != a) { // do not return the peer that is making the request as a result
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p = (unsigned char *)appendTo.appendField(ZT_ADDRESS_LENGTH);
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*(p++) = (unsigned char)((a >> 32) & 0xff);
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*(p++) = (unsigned char)((a >> 24) & 0xff);
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*(p++) = (unsigned char)((a >> 16) & 0xff);
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*(p++) = (unsigned char)((a >> 8) & 0xff);
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*p = (unsigned char)(a & 0xff);
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++added;
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}
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}
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}
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appendTo.setAt(totalAt,(uint32_t)totalKnown);
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appendTo.setAt(addedAt,(uint16_t)added);
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//TRACE("..MC Multicaster::gather() attached %u of %u peers for %.16llx/%s (2)",n,(unsigned int)(gs->second.members.size() - skipped),nwid,mg.toString().c_str());
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return added;
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}
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std::vector<Address> Multicaster::getMembers(uint64_t nwid,const MulticastGroup &mg,unsigned int limit) const
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{
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std::vector<Address> ls;
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Mutex::Lock _l(_groups_m);
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const MulticastGroupStatus *s = _groups.get(Multicaster::Key(nwid,mg));
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if (!s)
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return ls;
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for(std::vector<MulticastGroupMember>::const_reverse_iterator m(s->members.rbegin());m!=s->members.rend();++m) {
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ls.push_back(m->address);
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if (ls.size() >= limit)
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break;
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}
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return ls;
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}
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void Multicaster::send(
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void *tPtr,
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unsigned int limit,
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uint64_t now,
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uint64_t nwid,
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bool disableCompression,
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const std::vector<Address> &alwaysSendTo,
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const MulticastGroup &mg,
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const MAC &src,
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unsigned int etherType,
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const void *data,
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unsigned int len)
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{
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unsigned long idxbuf[8194];
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unsigned long *indexes = idxbuf;
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try {
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Mutex::Lock _l(_groups_m);
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MulticastGroupStatus &gs = _groups[Multicaster::Key(nwid,mg)];
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if (!gs.members.empty()) {
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// Allocate a memory buffer if group is monstrous
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if (gs.members.size() > (sizeof(idxbuf) / sizeof(unsigned long)))
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indexes = new unsigned long[gs.members.size()];
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// Generate a random permutation of member indexes
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for(unsigned long i=0;i<gs.members.size();++i)
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indexes[i] = i;
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for(unsigned long i=(unsigned long)gs.members.size()-1;i>0;--i) {
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unsigned long j = (unsigned long)RR->node->prng() % (i + 1);
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unsigned long tmp = indexes[j];
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indexes[j] = indexes[i];
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indexes[i] = tmp;
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}
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}
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if (gs.members.size() >= limit) {
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// Skip queue if we already have enough members to complete the send operation
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OutboundMulticast out;
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out.init(
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RR,
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now,
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nwid,
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disableCompression,
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limit,
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1, // we'll still gather a little from peers to keep multicast list fresh
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src,
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mg,
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etherType,
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data,
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len);
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unsigned int count = 0;
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for(std::vector<Address>::const_iterator ast(alwaysSendTo.begin());ast!=alwaysSendTo.end();++ast) {
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if (*ast != RR->identity.address()) {
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out.sendOnly(RR,tPtr,*ast); // optimization: don't use dedup log if it's a one-pass send
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if (++count >= limit)
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break;
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}
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}
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unsigned long idx = 0;
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while ((count < limit)&&(idx < gs.members.size())) {
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Address ma(gs.members[indexes[idx++]].address);
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if (std::find(alwaysSendTo.begin(),alwaysSendTo.end(),ma) == alwaysSendTo.end()) {
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out.sendOnly(RR,tPtr,ma); // optimization: don't use dedup log if it's a one-pass send
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++count;
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}
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}
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} else {
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unsigned int gatherLimit = (limit - (unsigned int)gs.members.size()) + 1;
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if ((gs.members.empty())||((now - gs.lastExplicitGather) >= ZT_MULTICAST_EXPLICIT_GATHER_DELAY)) {
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gs.lastExplicitGather = now;
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Address explicitGatherPeers[16];
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unsigned int numExplicitGatherPeers = 0;
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SharedPtr<Peer> bestRoot(RR->topology->getUpstreamPeer());
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if (bestRoot)
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explicitGatherPeers[numExplicitGatherPeers++] = bestRoot->address();
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explicitGatherPeers[numExplicitGatherPeers++] = Network::controllerFor(nwid);
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SharedPtr<Network> network(RR->node->network(nwid));
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if (network) {
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std::vector<Address> anchors(network->config().anchors());
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for(std::vector<Address>::const_iterator a(anchors.begin());a!=anchors.end();++a) {
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if (*a != RR->identity.address()) {
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explicitGatherPeers[numExplicitGatherPeers++] = *a;
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if (numExplicitGatherPeers == 16)
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break;
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}
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}
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}
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for(unsigned int k=0;k<numExplicitGatherPeers;++k) {
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const CertificateOfMembership *com = (network) ? ((network->config().com) ? &(network->config().com) : (const CertificateOfMembership *)0) : (const CertificateOfMembership *)0;
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Packet outp(explicitGatherPeers[k],RR->identity.address(),Packet::VERB_MULTICAST_GATHER);
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outp.append(nwid);
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outp.append((uint8_t)((com) ? 0x01 : 0x00));
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mg.mac().appendTo(outp);
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outp.append((uint32_t)mg.adi());
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outp.append((uint32_t)gatherLimit);
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if (com)
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com->serialize(outp);
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RR->node->expectReplyTo(outp.packetId());
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RR->sw->send(tPtr,outp,true);
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}
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}
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gs.txQueue.push_back(OutboundMulticast());
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OutboundMulticast &out = gs.txQueue.back();
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out.init(
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RR,
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now,
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nwid,
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disableCompression,
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limit,
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gatherLimit,
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src,
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mg,
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etherType,
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data,
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len);
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unsigned int count = 0;
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for(std::vector<Address>::const_iterator ast(alwaysSendTo.begin());ast!=alwaysSendTo.end();++ast) {
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if (*ast != RR->identity.address()) {
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out.sendAndLog(RR,tPtr,*ast);
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if (++count >= limit)
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break;
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}
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}
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unsigned long idx = 0;
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while ((count < limit)&&(idx < gs.members.size())) {
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Address ma(gs.members[indexes[idx++]].address);
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if (std::find(alwaysSendTo.begin(),alwaysSendTo.end(),ma) == alwaysSendTo.end()) {
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out.sendAndLog(RR,tPtr,ma);
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++count;
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}
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}
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}
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} catch ( ... ) {} // this is a sanity check to catch any failures and make sure indexes[] still gets deleted
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// Free allocated memory buffer if any
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if (indexes != idxbuf)
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delete [] indexes;
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}
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void Multicaster::clean(uint64_t now)
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{
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{
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Mutex::Lock _l(_groups_m);
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Multicaster::Key *k = (Multicaster::Key *)0;
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MulticastGroupStatus *s = (MulticastGroupStatus *)0;
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Hashtable<Multicaster::Key,MulticastGroupStatus>::Iterator mm(_groups);
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while (mm.next(k,s)) {
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for(std::list<OutboundMulticast>::iterator tx(s->txQueue.begin());tx!=s->txQueue.end();) {
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if ((tx->expired(now))||(tx->atLimit()))
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s->txQueue.erase(tx++);
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else ++tx;
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}
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unsigned long count = 0;
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{
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std::vector<MulticastGroupMember>::iterator reader(s->members.begin());
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std::vector<MulticastGroupMember>::iterator writer(reader);
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while (reader != s->members.end()) {
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if ((now - reader->timestamp) < ZT_MULTICAST_LIKE_EXPIRE) {
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*writer = *reader;
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++writer;
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++count;
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}
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++reader;
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}
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}
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if (count) {
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s->members.resize(count);
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} else if (s->txQueue.empty()) {
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_groups.erase(*k);
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} else {
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s->members.clear();
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}
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}
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}
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{
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Mutex::Lock _l(_gatherAuth_m);
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_GatherAuthKey *k = (_GatherAuthKey *)0;
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uint64_t *ts = NULL;
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Hashtable<_GatherAuthKey,uint64_t>::Iterator i(_gatherAuth);
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while (i.next(k,ts)) {
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if ((now - *ts) >= ZT_MULTICAST_CREDENTIAL_EXPIRATON)
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_gatherAuth.erase(*k);
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}
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}
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}
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void Multicaster::addCredential(void *tPtr,const CertificateOfMembership &com,bool alreadyValidated)
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{
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if ((alreadyValidated)||(com.verify(RR,tPtr) == 0)) {
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Mutex::Lock _l(_gatherAuth_m);
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_gatherAuth[_GatherAuthKey(com.networkId(),com.issuedTo())] = RR->node->now();
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}
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}
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void Multicaster::_add(void *tPtr,uint64_t now,uint64_t nwid,const MulticastGroup &mg,MulticastGroupStatus &gs,const Address &member)
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{
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// assumes _groups_m is locked
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// Do not add self -- even if someone else returns it
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if (member == RR->identity.address())
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return;
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for(std::vector<MulticastGroupMember>::iterator m(gs.members.begin());m!=gs.members.end();++m) {
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if (m->address == member) {
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m->timestamp = now;
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return;
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}
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}
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gs.members.push_back(MulticastGroupMember(member,now));
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//TRACE("..MC %s joined multicast group %.16llx/%s via %s",member.toString().c_str(),nwid,mg.toString().c_str(),((learnedFrom) ? learnedFrom.toString().c_str() : "(direct)"));
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for(std::list<OutboundMulticast>::iterator tx(gs.txQueue.begin());tx!=gs.txQueue.end();) {
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if (tx->atLimit())
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gs.txQueue.erase(tx++);
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else {
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tx->sendIfNew(RR,tPtr,member);
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if (tx->atLimit())
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gs.txQueue.erase(tx++);
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else ++tx;
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}
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}
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}
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} // namespace ZeroTier
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