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ZeroTierOne/node/Network.cpp
Adam Ierymenko c8554504f3 .
2016-12-22 18:37:46 -08:00

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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include "Constants.hpp"
#include "../version.h"
#include "Network.hpp"
#include "RuntimeEnvironment.hpp"
#include "MAC.hpp"
#include "Address.hpp"
#include "InetAddress.hpp"
#include "Switch.hpp"
#include "Buffer.hpp"
#include "Packet.hpp"
#include "NetworkController.hpp"
#include "Node.hpp"
#include "Peer.hpp"
// Uncomment to make the rules engine dump trace info to stdout
//#define ZT_RULES_ENGINE_DEBUGGING 1
namespace ZeroTier {
namespace {
#ifdef ZT_RULES_ENGINE_DEBUGGING
#define FILTER_TRACE(f,...) { Utils::snprintf(dpbuf,sizeof(dpbuf),f,##__VA_ARGS__); dlog.push_back(std::string(dpbuf)); }
static const char *_rtn(const ZT_VirtualNetworkRuleType rt)
{
switch(rt) {
case ZT_NETWORK_RULE_ACTION_DROP: return "ACTION_DROP";
case ZT_NETWORK_RULE_ACTION_ACCEPT: return "ACTION_ACCEPT";
case ZT_NETWORK_RULE_ACTION_TEE: return "ACTION_TEE";
case ZT_NETWORK_RULE_ACTION_WATCH: return "ACTION_WATCH";
case ZT_NETWORK_RULE_ACTION_REDIRECT: return "ACTION_REDIRECT";
case ZT_NETWORK_RULE_ACTION_DEBUG_LOG: return "ACTION_DEBUG_LOG";
case ZT_NETWORK_RULE_MATCH_SOURCE_ZEROTIER_ADDRESS: return "MATCH_SOURCE_ZEROTIER_ADDRESS";
case ZT_NETWORK_RULE_MATCH_DEST_ZEROTIER_ADDRESS: return "MATCH_DEST_ZEROTIER_ADDRESS";
case ZT_NETWORK_RULE_MATCH_VLAN_ID: return "MATCH_VLAN_ID";
case ZT_NETWORK_RULE_MATCH_VLAN_PCP: return "MATCH_VLAN_PCP";
case ZT_NETWORK_RULE_MATCH_VLAN_DEI: return "MATCH_VLAN_DEI";
case ZT_NETWORK_RULE_MATCH_MAC_SOURCE: return "MATCH_MAC_SOURCE";
case ZT_NETWORK_RULE_MATCH_MAC_DEST: return "MATCH_MAC_DEST";
case ZT_NETWORK_RULE_MATCH_IPV4_SOURCE: return "MATCH_IPV4_SOURCE";
case ZT_NETWORK_RULE_MATCH_IPV4_DEST: return "MATCH_IPV4_DEST";
case ZT_NETWORK_RULE_MATCH_IPV6_SOURCE: return "MATCH_IPV6_SOURCE";
case ZT_NETWORK_RULE_MATCH_IPV6_DEST: return "MATCH_IPV6_DEST";
case ZT_NETWORK_RULE_MATCH_IP_TOS: return "MATCH_IP_TOS";
case ZT_NETWORK_RULE_MATCH_IP_PROTOCOL: return "MATCH_IP_PROTOCOL";
case ZT_NETWORK_RULE_MATCH_ETHERTYPE: return "MATCH_ETHERTYPE";
case ZT_NETWORK_RULE_MATCH_ICMP: return "MATCH_ICMP";
case ZT_NETWORK_RULE_MATCH_IP_SOURCE_PORT_RANGE: return "MATCH_IP_SOURCE_PORT_RANGE";
case ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE: return "MATCH_IP_DEST_PORT_RANGE";
case ZT_NETWORK_RULE_MATCH_CHARACTERISTICS: return "MATCH_CHARACTERISTICS";
case ZT_NETWORK_RULE_MATCH_FRAME_SIZE_RANGE: return "MATCH_FRAME_SIZE_RANGE";
case ZT_NETWORK_RULE_MATCH_TAGS_DIFFERENCE: return "MATCH_TAGS_DIFFERENCE";
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_AND: return "MATCH_TAGS_BITWISE_AND";
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_OR: return "MATCH_TAGS_BITWISE_OR";
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_XOR: return "MATCH_TAGS_BITWISE_XOR";
default: return "???";
}
}
static const void _dumpFilterTrace(const char *ruleName,uint8_t thisSetMatches,bool inbound,const Address &ztSource,const Address &ztDest,const MAC &macSource,const MAC &macDest,const std::vector<std::string> &dlog,unsigned int frameLen,unsigned int etherType,const char *msg)
{
static volatile unsigned long cnt = 0;
printf("%.6lu %c %s %s frameLen=%u etherType=%u" ZT_EOL_S,
cnt++,
((thisSetMatches) ? 'Y' : '.'),
ruleName,
((inbound) ? "INBOUND" : "OUTBOUND"),
frameLen,
etherType
);
for(std::vector<std::string>::const_iterator m(dlog.begin());m!=dlog.end();++m)
printf(" | %s" ZT_EOL_S,m->c_str());
printf(" + %c %s->%s %.2x:%.2x:%.2x:%.2x:%.2x:%.2x->%.2x:%.2x:%.2x:%.2x:%.2x:%.2x" ZT_EOL_S,
((thisSetMatches) ? 'Y' : '.'),
ztSource.toString().c_str(),
ztDest.toString().c_str(),
(unsigned int)macSource[0],
(unsigned int)macSource[1],
(unsigned int)macSource[2],
(unsigned int)macSource[3],
(unsigned int)macSource[4],
(unsigned int)macSource[5],
(unsigned int)macDest[0],
(unsigned int)macDest[1],
(unsigned int)macDest[2],
(unsigned int)macDest[3],
(unsigned int)macDest[4],
(unsigned int)macDest[5]
);
if (msg)
printf(" + (%s)" ZT_EOL_S,msg);
fflush(stdout);
}
#else
#define FILTER_TRACE(f,...) {}
#endif // ZT_RULES_ENGINE_DEBUGGING
// Returns true if packet appears valid; pos and proto will be set
static bool _ipv6GetPayload(const uint8_t *frameData,unsigned int frameLen,unsigned int &pos,unsigned int &proto)
{
if (frameLen < 40)
return false;
pos = 40;
proto = frameData[6];
while (pos <= frameLen) {
switch(proto) {
case 0: // hop-by-hop options
case 43: // routing
case 60: // destination options
case 135: // mobility options
if ((pos + 8) > frameLen)
return false; // invalid!
proto = frameData[pos];
pos += ((unsigned int)frameData[pos + 1] * 8) + 8;
break;
//case 44: // fragment -- we currently can't parse these and they are deprecated in IPv6 anyway
//case 50:
//case 51: // IPSec ESP and AH -- we have to stop here since this is encrypted stuff
default:
return true;
}
}
return false; // overflow == invalid
}
enum _doZtFilterResult
{
DOZTFILTER_NO_MATCH,
DOZTFILTER_DROP,
DOZTFILTER_REDIRECT,
DOZTFILTER_ACCEPT,
DOZTFILTER_SUPER_ACCEPT
};
static _doZtFilterResult _doZtFilter(
const RuntimeEnvironment *RR,
const NetworkConfig &nconf,
const Membership *membership, // can be NULL
const bool inbound,
const Address &ztSource,
Address &ztDest, // MUTABLE -- is changed on REDIRECT actions
const MAC &macSource,
const MAC &macDest,
const uint8_t *const frameData,
const unsigned int frameLen,
const unsigned int etherType,
const unsigned int vlanId,
const ZT_VirtualNetworkRule *rules, // cannot be NULL
const unsigned int ruleCount,
Address &cc, // MUTABLE -- set to TEE destination if TEE action is taken or left alone otherwise
unsigned int &ccLength, // MUTABLE -- set to length of packet payload to TEE
bool &ccWatch) // MUTABLE -- set to true for WATCH target as opposed to normal TEE
{
#ifdef ZT_RULES_ENGINE_DEBUGGING
char dpbuf[1024]; // used by FILTER_TRACE macro
std::vector<std::string> dlog;
#endif // ZT_RULES_ENGINE_DEBUGGING
// Set to true if we are a TEE/REDIRECT/WATCH target
bool superAccept = false;
// The default match state for each set of entries starts as 'true' since an
// ACTION with no MATCH entries preceding it is always taken.
uint8_t thisSetMatches = 1;
for(unsigned int rn=0;rn<ruleCount;++rn) {
const ZT_VirtualNetworkRuleType rt = (ZT_VirtualNetworkRuleType)(rules[rn].t & 0x3f);
// First check if this is an ACTION
if ((unsigned int)rt <= (unsigned int)ZT_NETWORK_RULE_ACTION__MAX_ID) {
if (thisSetMatches) {
switch(rt) {
case ZT_NETWORK_RULE_ACTION_DROP:
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace("ACTION_DROP",thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
#endif // ZT_RULES_ENGINE_DEBUGGING
return DOZTFILTER_DROP;
case ZT_NETWORK_RULE_ACTION_ACCEPT:
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace("ACTION_ACCEPT",thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
#endif // ZT_RULES_ENGINE_DEBUGGING
return (superAccept ? DOZTFILTER_SUPER_ACCEPT : DOZTFILTER_ACCEPT); // match, accept packet
// These are initially handled together since preliminary logic is common
case ZT_NETWORK_RULE_ACTION_TEE:
case ZT_NETWORK_RULE_ACTION_WATCH:
case ZT_NETWORK_RULE_ACTION_REDIRECT: {
const Address fwdAddr(rules[rn].v.fwd.address);
if (fwdAddr == ztSource) {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,"skipped as no-op since source is target");
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
} else if (fwdAddr == RR->identity.address()) {
if (inbound) {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,"interpreted as super-ACCEPT on inbound since we are target");
#endif // ZT_RULES_ENGINE_DEBUGGING
return DOZTFILTER_SUPER_ACCEPT;
} else {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,"skipped as no-op on outbound since we are target");
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
}
} else if (fwdAddr == ztDest) {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,"skipped as no-op because destination is already target");
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
} else {
if (rt == ZT_NETWORK_RULE_ACTION_REDIRECT) {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace("ACTION_REDIRECT",thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
#endif // ZT_RULES_ENGINE_DEBUGGING
ztDest = fwdAddr;
return DOZTFILTER_REDIRECT;
} else {
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
cc = fwdAddr;
ccLength = (rules[rn].v.fwd.length != 0) ? ((frameLen < (unsigned int)rules[rn].v.fwd.length) ? frameLen : (unsigned int)rules[rn].v.fwd.length) : frameLen;
ccWatch = (rt == ZT_NETWORK_RULE_ACTION_WATCH);
}
}
} continue;
// This is a no-op that exists for use with rules engine tracing and isn't for use in production
case ZT_NETWORK_RULE_ACTION_DEBUG_LOG: // a no-op target specifically for debugging purposes
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace("ACTION_DEBUG_LOG",thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
continue;
// Unrecognized ACTIONs are ignored as no-ops
default:
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
continue;
}
} else {
// If this is an incoming packet and we are a TEE or REDIRECT target, we should
// super-accept if we accept at all. This will cause us to accept redirected or
// tee'd packets in spite of MAC and ZT addressing checks.
if (inbound) {
switch(rt) {
case ZT_NETWORK_RULE_ACTION_TEE:
case ZT_NETWORK_RULE_ACTION_WATCH:
case ZT_NETWORK_RULE_ACTION_REDIRECT:
if (RR->identity.address() == rules[rn].v.fwd.address)
superAccept = true;
break;
default:
break;
}
}
#ifdef ZT_RULES_ENGINE_DEBUGGING
_dumpFilterTrace(_rtn(rt),thisSetMatches,inbound,ztSource,ztDest,macSource,macDest,dlog,frameLen,etherType,(const char *)0);
dlog.clear();
#endif // ZT_RULES_ENGINE_DEBUGGING
thisSetMatches = 1; // reset to default true for next batch of entries
continue;
}
}
// Circuit breaker: no need to evaluate an AND if the set's match state
// is currently false since anything AND false is false.
if ((!thisSetMatches)&&(!(rules[rn].t & 0x40)))
continue;
// If this was not an ACTION evaluate next MATCH and update thisSetMatches with (AND [result])
uint8_t thisRuleMatches = 0;
switch(rt) {
case ZT_NETWORK_RULE_MATCH_SOURCE_ZEROTIER_ADDRESS:
thisRuleMatches = (uint8_t)(rules[rn].v.zt == ztSource.toInt());
FILTER_TRACE("%u %s %c %.10llx==%.10llx -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),rules[rn].v.zt,ztSource.toInt(),(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_DEST_ZEROTIER_ADDRESS:
thisRuleMatches = (uint8_t)(rules[rn].v.zt == ztDest.toInt());
FILTER_TRACE("%u %s %c %.10llx==%.10llx -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),rules[rn].v.zt,ztDest.toInt(),(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_VLAN_ID:
thisRuleMatches = (uint8_t)(rules[rn].v.vlanId == (uint16_t)vlanId);
FILTER_TRACE("%u %s %c %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.vlanId,(unsigned int)vlanId,(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_VLAN_PCP:
// NOT SUPPORTED YET
thisRuleMatches = (uint8_t)(rules[rn].v.vlanPcp == 0);
FILTER_TRACE("%u %s %c %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.vlanPcp,0,(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_VLAN_DEI:
// NOT SUPPORTED YET
thisRuleMatches = (uint8_t)(rules[rn].v.vlanDei == 0);
FILTER_TRACE("%u %s %c %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.vlanDei,0,(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_MAC_SOURCE:
thisRuleMatches = (uint8_t)(MAC(rules[rn].v.mac,6) == macSource);
FILTER_TRACE("%u %s %c %.12llx=%.12llx -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),rules[rn].v.mac,macSource.toInt(),(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_MAC_DEST:
thisRuleMatches = (uint8_t)(MAC(rules[rn].v.mac,6) == macDest);
FILTER_TRACE("%u %s %c %.12llx=%.12llx -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),rules[rn].v.mac,macDest.toInt(),(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_IPV4_SOURCE:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
thisRuleMatches = (uint8_t)(InetAddress((const void *)&(rules[rn].v.ipv4.ip),4,rules[rn].v.ipv4.mask).containsAddress(InetAddress((const void *)(frameData + 12),4,0)));
FILTER_TRACE("%u %s %c %s contains %s -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),InetAddress((const void *)&(rules[rn].v.ipv4.ip),4,rules[rn].v.ipv4.mask).toString().c_str(),InetAddress((const void *)(frameData + 12),4,0).toIpString().c_str(),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IPv4] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_IPV4_DEST:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
thisRuleMatches = (uint8_t)(InetAddress((const void *)&(rules[rn].v.ipv4.ip),4,rules[rn].v.ipv4.mask).containsAddress(InetAddress((const void *)(frameData + 16),4,0)));
FILTER_TRACE("%u %s %c %s contains %s -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),InetAddress((const void *)&(rules[rn].v.ipv4.ip),4,rules[rn].v.ipv4.mask).toString().c_str(),InetAddress((const void *)(frameData + 16),4,0).toIpString().c_str(),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IPv4] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_IPV6_SOURCE:
if ((etherType == ZT_ETHERTYPE_IPV6)&&(frameLen >= 40)) {
thisRuleMatches = (uint8_t)(InetAddress((const void *)rules[rn].v.ipv6.ip,16,rules[rn].v.ipv6.mask).containsAddress(InetAddress((const void *)(frameData + 8),16,0)));
FILTER_TRACE("%u %s %c %s contains %s -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),InetAddress((const void *)rules[rn].v.ipv6.ip,16,rules[rn].v.ipv6.mask).toString().c_str(),InetAddress((const void *)(frameData + 8),16,0).toIpString().c_str(),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_IPV6_DEST:
if ((etherType == ZT_ETHERTYPE_IPV6)&&(frameLen >= 40)) {
thisRuleMatches = (uint8_t)(InetAddress((const void *)rules[rn].v.ipv6.ip,16,rules[rn].v.ipv6.mask).containsAddress(InetAddress((const void *)(frameData + 24),16,0)));
FILTER_TRACE("%u %s %c %s contains %s -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),InetAddress((const void *)rules[rn].v.ipv6.ip,16,rules[rn].v.ipv6.mask).toString().c_str(),InetAddress((const void *)(frameData + 24),16,0).toIpString().c_str(),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_IP_TOS:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
thisRuleMatches = (uint8_t)(rules[rn].v.ipTos == ((frameData[1] & 0xfc) >> 2));
FILTER_TRACE("%u %s %c (IPv4) %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.ipTos,(unsigned int)((frameData[1] & 0xfc) >> 2),(unsigned int)thisRuleMatches);
} else if ((etherType == ZT_ETHERTYPE_IPV6)&&(frameLen >= 40)) {
const uint8_t trafficClass = ((frameData[0] << 4) & 0xf0) | ((frameData[1] >> 4) & 0x0f);
thisRuleMatches = (uint8_t)(rules[rn].v.ipTos == ((trafficClass & 0xfc) >> 2));
FILTER_TRACE("%u %s %c (IPv6) %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.ipTos,(unsigned int)((trafficClass & 0xfc) >> 2),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IP] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_IP_PROTOCOL:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
thisRuleMatches = (uint8_t)(rules[rn].v.ipProtocol == frameData[9]);
FILTER_TRACE("%u %s %c (IPv4) %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.ipProtocol,(unsigned int)frameData[9],(unsigned int)thisRuleMatches);
} else if (etherType == ZT_ETHERTYPE_IPV6) {
unsigned int pos = 0,proto = 0;
if (_ipv6GetPayload(frameData,frameLen,pos,proto)) {
thisRuleMatches = (uint8_t)(rules[rn].v.ipProtocol == (uint8_t)proto);
FILTER_TRACE("%u %s %c (IPv6) %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.ipProtocol,proto,(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [invalid IPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IP] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_ETHERTYPE:
thisRuleMatches = (uint8_t)(rules[rn].v.etherType == (uint16_t)etherType);
FILTER_TRACE("%u %s %c %u==%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.etherType,etherType,(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_ICMP:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
if (frameData[9] == 0x01) { // IP protocol == ICMP
const unsigned int ihl = (frameData[0] & 0xf) * 4;
if (frameLen >= (ihl + 2)) {
if (rules[rn].v.icmp.type == frameData[ihl]) {
if ((rules[rn].v.icmp.flags & 0x01) != 0) {
thisRuleMatches = (uint8_t)(frameData[ihl+1] == rules[rn].v.icmp.code);
} else {
thisRuleMatches = 1;
}
} else {
thisRuleMatches = 0;
}
FILTER_TRACE("%u %s %c (IPv4) icmp-type:%d==%d icmp-code:%d==%d -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(int)frameData[ihl],(int)rules[rn].v.icmp.type,(int)frameData[ihl+1],(((rules[rn].v.icmp.flags & 0x01) != 0) ? (int)rules[rn].v.icmp.code : -1),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [IPv4 frame invalid] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not ICMP] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else if (etherType == ZT_ETHERTYPE_IPV6) {
unsigned int pos = 0,proto = 0;
if (_ipv6GetPayload(frameData,frameLen,pos,proto)) {
if ((proto == 0x3a)&&(frameLen >= (pos+2))) {
if (rules[rn].v.icmp.type == frameData[pos]) {
if ((rules[rn].v.icmp.flags & 0x01) != 0) {
thisRuleMatches = (uint8_t)(frameData[pos+1] == rules[rn].v.icmp.code);
} else {
thisRuleMatches = 1;
}
} else {
thisRuleMatches = 0;
}
FILTER_TRACE("%u %s %c (IPv6) icmp-type:%d==%d icmp-code:%d==%d -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(int)frameData[pos],(int)rules[rn].v.icmp.type,(int)frameData[pos+1],(((rules[rn].v.icmp.flags & 0x01) != 0) ? (int)rules[rn].v.icmp.code : -1),(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not ICMPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [invalid IPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IP] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
break;
case ZT_NETWORK_RULE_MATCH_IP_SOURCE_PORT_RANGE:
case ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE:
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)) {
const unsigned int headerLen = 4 * (frameData[0] & 0xf);
int p = -1;
switch(frameData[9]) { // IP protocol number
// All these start with 16-bit source and destination port in that order
case 0x06: // TCP
case 0x11: // UDP
case 0x84: // SCTP
case 0x88: // UDPLite
if (frameLen > (headerLen + 4)) {
unsigned int pos = headerLen + ((rt == ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE) ? 2 : 0);
p = (int)frameData[pos++] << 8;
p |= (int)frameData[pos];
}
break;
}
thisRuleMatches = (p >= 0) ? (uint8_t)((p >= (int)rules[rn].v.port[0])&&(p <= (int)rules[rn].v.port[1])) : (uint8_t)0;
FILTER_TRACE("%u %s %c (IPv4) %d in %d-%d -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),p,(int)rules[rn].v.port[0],(int)rules[rn].v.port[1],(unsigned int)thisRuleMatches);
} else if (etherType == ZT_ETHERTYPE_IPV6) {
unsigned int pos = 0,proto = 0;
if (_ipv6GetPayload(frameData,frameLen,pos,proto)) {
int p = -1;
switch(proto) { // IP protocol number
// All these start with 16-bit source and destination port in that order
case 0x06: // TCP
case 0x11: // UDP
case 0x84: // SCTP
case 0x88: // UDPLite
if (frameLen > (pos + 4)) {
if (rt == ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE) pos += 2;
p = (int)frameData[pos++] << 8;
p |= (int)frameData[pos];
}
break;
}
thisRuleMatches = (p > 0) ? (uint8_t)((p >= (int)rules[rn].v.port[0])&&(p <= (int)rules[rn].v.port[1])) : (uint8_t)0;
FILTER_TRACE("%u %s %c (IPv6) %d in %d-%d -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),p,(int)rules[rn].v.port[0],(int)rules[rn].v.port[1],(unsigned int)thisRuleMatches);
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [invalid IPv6] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c [frame not IP] -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='));
}
break;
case ZT_NETWORK_RULE_MATCH_CHARACTERISTICS: {
uint64_t cf = (inbound) ? ZT_RULE_PACKET_CHARACTERISTICS_INBOUND : 0ULL;
if (macDest.isMulticast()) cf |= ZT_RULE_PACKET_CHARACTERISTICS_MULTICAST;
if (macDest.isBroadcast()) cf |= ZT_RULE_PACKET_CHARACTERISTICS_BROADCAST;
if ((etherType == ZT_ETHERTYPE_IPV4)&&(frameLen >= 20)&&(frameData[9] == 0x06)) {
const unsigned int headerLen = 4 * (frameData[0] & 0xf);
cf |= (uint64_t)frameData[headerLen + 13];
cf |= (((uint64_t)(frameData[headerLen + 12] & 0x0f)) << 8);
} else if (etherType == ZT_ETHERTYPE_IPV6) {
unsigned int pos = 0,proto = 0;
if (_ipv6GetPayload(frameData,frameLen,pos,proto)) {
if ((proto == 0x06)&&(frameLen > (pos + 14))) {
cf |= (uint64_t)frameData[pos + 13];
cf |= (((uint64_t)(frameData[pos + 12] & 0x0f)) << 8);
}
}
}
thisRuleMatches = (uint8_t)((cf & rules[rn].v.characteristics) != 0);
FILTER_TRACE("%u %s %c (%.16llx | %.16llx)!=0 -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),cf,rules[rn].v.characteristics,(unsigned int)thisRuleMatches);
} break;
case ZT_NETWORK_RULE_MATCH_FRAME_SIZE_RANGE:
thisRuleMatches = (uint8_t)((frameLen >= (unsigned int)rules[rn].v.frameSize[0])&&(frameLen <= (unsigned int)rules[rn].v.frameSize[1]));
FILTER_TRACE("%u %s %c %u in %u-%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),frameLen,(unsigned int)rules[rn].v.frameSize[0],(unsigned int)rules[rn].v.frameSize[1],(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_RANDOM:
thisRuleMatches = (uint8_t)((uint32_t)(RR->node->prng() & 0xffffffffULL) <= rules[rn].v.randomProbability);
FILTER_TRACE("%u %s %c -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)thisRuleMatches);
break;
case ZT_NETWORK_RULE_MATCH_TAGS_DIFFERENCE:
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_AND:
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_OR:
case ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_XOR:
case ZT_NETWORK_RULE_MATCH_TAGS_EQUAL: {
const Tag *const localTag = std::lower_bound(&(nconf.tags[0]),&(nconf.tags[nconf.tagCount]),rules[rn].v.tag.id,Tag::IdComparePredicate());
if ((localTag != &(nconf.tags[nconf.tagCount]))&&(localTag->id() == rules[rn].v.tag.id)) {
const Tag *const remoteTag = ((membership) ? membership->getTag(nconf,rules[rn].v.tag.id) : (const Tag *)0);
if (remoteTag) {
const uint32_t ltv = localTag->value();
const uint32_t rtv = remoteTag->value();
if (rt == ZT_NETWORK_RULE_MATCH_TAGS_DIFFERENCE) {
const uint32_t diff = (ltv > rtv) ? (ltv - rtv) : (rtv - ltv);
thisRuleMatches = (uint8_t)(diff <= rules[rn].v.tag.value);
FILTER_TRACE("%u %s %c TAG %u local:%u remote:%u difference:%u<=%u -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id,ltv,rtv,diff,(unsigned int)rules[rn].v.tag.value,thisRuleMatches);
} else if (rt == ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_AND) {
thisRuleMatches = (uint8_t)((ltv & rtv) == rules[rn].v.tag.value);
FILTER_TRACE("%u %s %c TAG %u local:%.8x & remote:%.8x == %.8x -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id,ltv,rtv,(unsigned int)rules[rn].v.tag.value,(unsigned int)thisRuleMatches);
} else if (rt == ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_OR) {
thisRuleMatches = (uint8_t)((ltv | rtv) == rules[rn].v.tag.value);
FILTER_TRACE("%u %s %c TAG %u local:%.8x | remote:%.8x == %.8x -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id,ltv,rtv,(unsigned int)rules[rn].v.tag.value,(unsigned int)thisRuleMatches);
} else if (rt == ZT_NETWORK_RULE_MATCH_TAGS_BITWISE_XOR) {
thisRuleMatches = (uint8_t)((ltv ^ rtv) == rules[rn].v.tag.value);
FILTER_TRACE("%u %s %c TAG %u local:%.8x ^ remote:%.8x == %.8x -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id,ltv,rtv,(unsigned int)rules[rn].v.tag.value,(unsigned int)thisRuleMatches);
} else if (rt == ZT_NETWORK_RULE_MATCH_TAGS_EQUAL) {
thisRuleMatches = (uint8_t)((ltv == rules[rn].v.tag.value)&&(rtv == rules[rn].v.tag.value));
FILTER_TRACE("%u %s %c TAG %u local:%.8x and remote:%.8x == %.8x -> %u",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id,ltv,rtv,(unsigned int)rules[rn].v.tag.value,(unsigned int)thisRuleMatches);
} else { // sanity check, can't really happen
thisRuleMatches = 0;
}
} else {
if ((inbound)&&(!superAccept)) {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c remote tag %u not found -> 0 (inbound side is strict)",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id);
} else {
thisRuleMatches = 1;
FILTER_TRACE("%u %s %c remote tag %u not found -> 1 (outbound side and TEE/REDIRECT targets are not strict)",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id);
}
}
} else {
thisRuleMatches = 0;
FILTER_TRACE("%u %s %c local tag %u not found -> 0",rn,_rtn(rt),(((rules[rn].t & 0x80) != 0) ? '!' : '='),(unsigned int)rules[rn].v.tag.id);
}
} break;
// The result of an unsupported MATCH is configurable at the network
// level via a flag.
default:
thisRuleMatches = (uint8_t)((nconf.flags & ZT_NETWORKCONFIG_FLAG_RULES_RESULT_OF_UNSUPPORTED_MATCH) != 0);
break;
}
if ((rules[rn].t & 0x40))
thisSetMatches |= (thisRuleMatches ^ ((rules[rn].t >> 7) & 1));
else thisSetMatches &= (thisRuleMatches ^ ((rules[rn].t >> 7) & 1));
}
return DOZTFILTER_NO_MATCH;
}
} // anonymous namespace
const ZeroTier::MulticastGroup Network::BROADCAST(ZeroTier::MAC(0xffffffffffffULL),0);
Network::Network(const RuntimeEnvironment *renv,uint64_t nwid,void *uptr) :
RR(renv),
_uPtr(uptr),
_id(nwid),
_lastAnnouncedMulticastGroupsUpstream(0),
_mac(renv->identity.address(),nwid),
_portInitialized(false),
_lastConfigUpdate(0),
_destroyed(false),
_netconfFailure(NETCONF_FAILURE_NONE),
_portError(0)
{
for(int i=0;i<ZT_NETWORK_MAX_INCOMING_UPDATES;++i)
_incomingConfigChunks[i].ts = 0;
char confn[128];
Utils::snprintf(confn,sizeof(confn),"networks.d/%.16llx.conf",_id);
bool gotConf = false;
Dictionary<ZT_NETWORKCONFIG_DICT_CAPACITY> *dconf = new Dictionary<ZT_NETWORKCONFIG_DICT_CAPACITY>();
NetworkConfig *nconf = new NetworkConfig();
try {
std::string conf(RR->node->dataStoreGet(confn));
if (conf.length()) {
dconf->load(conf.c_str());
if (nconf->fromDictionary(*dconf)) {
this->setConfiguration(*nconf,false);
_lastConfigUpdate = 0; // we still want to re-request a new config from the network
gotConf = true;
}
}
} catch ( ... ) {} // ignore invalids, we'll re-request
delete nconf;
delete dconf;
if (!gotConf) {
// Save a one-byte CR to persist membership while we request a real netconf
RR->node->dataStorePut(confn,"\n",1,false);
}
if (!_portInitialized) {
ZT_VirtualNetworkConfig ctmp;
_externalConfig(&ctmp);
_portError = RR->node->configureVirtualNetworkPort(_id,&_uPtr,ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_UP,&ctmp);
_portInitialized = true;
}
}
Network::~Network()
{
ZT_VirtualNetworkConfig ctmp;
_externalConfig(&ctmp);
char n[128];
if (_destroyed) {
RR->node->configureVirtualNetworkPort(_id,&_uPtr,ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DESTROY,&ctmp);
Utils::snprintf(n,sizeof(n),"networks.d/%.16llx.conf",_id);
RR->node->dataStoreDelete(n);
} else {
RR->node->configureVirtualNetworkPort(_id,&_uPtr,ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DOWN,&ctmp);
}
}
bool Network::filterOutgoingPacket(
const bool noTee,
const Address &ztSource,
const Address &ztDest,
const MAC &macSource,
const MAC &macDest,
const uint8_t *frameData,
const unsigned int frameLen,
const unsigned int etherType,
const unsigned int vlanId)
{
const uint64_t now = RR->node->now();
Address ztFinalDest(ztDest);
int localCapabilityIndex = -1;
bool accept = false;
Mutex::Lock _l(_lock);
Membership *const membership = (ztDest) ? _memberships.get(ztDest) : (Membership *)0;
Address cc;
unsigned int ccLength = 0;
bool ccWatch = false;
switch(_doZtFilter(RR,_config,membership,false,ztSource,ztFinalDest,macSource,macDest,frameData,frameLen,etherType,vlanId,_config.rules,_config.ruleCount,cc,ccLength,ccWatch)) {
case DOZTFILTER_NO_MATCH:
for(unsigned int c=0;c<_config.capabilityCount;++c) {
ztFinalDest = ztDest; // sanity check, shouldn't be possible if there was no match
Address cc2;
unsigned int ccLength2 = 0;
bool ccWatch2 = false;
switch (_doZtFilter(RR,_config,membership,false,ztSource,ztFinalDest,macSource,macDest,frameData,frameLen,etherType,vlanId,_config.capabilities[c].rules(),_config.capabilities[c].ruleCount(),cc2,ccLength2,ccWatch2)) {
case DOZTFILTER_NO_MATCH:
case DOZTFILTER_DROP: // explicit DROP in a capability just terminates its evaluation and is an anti-pattern
break;
case DOZTFILTER_REDIRECT: // interpreted as ACCEPT but ztFinalDest will have been changed in _doZtFilter()
case DOZTFILTER_ACCEPT:
case DOZTFILTER_SUPER_ACCEPT: // no difference in behavior on outbound side
localCapabilityIndex = (int)c;
accept = true;
if ((!noTee)&&(cc2)) {
Membership &m2 = _membership(cc2);
m2.pushCredentials(RR,now,cc2,_config,localCapabilityIndex,false);
Packet outp(cc2,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)(ccWatch2 ? 0x16 : 0x02));
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,ccLength2);
outp.compress();
RR->sw->send(outp,true);
}
break;
}
if (accept)
break;
}
break;
case DOZTFILTER_DROP:
return false;
case DOZTFILTER_REDIRECT: // interpreted as ACCEPT but ztFinalDest will have been changed in _doZtFilter()
case DOZTFILTER_ACCEPT:
case DOZTFILTER_SUPER_ACCEPT: // no difference in behavior on outbound side
accept = true;
break;
}
if (accept) {
if (membership)
membership->pushCredentials(RR,now,ztDest,_config,localCapabilityIndex,false);
if ((!noTee)&&(cc)) {
Membership &m2 = _membership(cc);
m2.pushCredentials(RR,now,cc,_config,localCapabilityIndex,false);
Packet outp(cc,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)(ccWatch ? 0x16 : 0x02));
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,ccLength);
outp.compress();
RR->sw->send(outp,true);
}
if ((ztDest != ztFinalDest)&&(ztFinalDest)) {
Membership &m2 = _membership(ztFinalDest);
m2.pushCredentials(RR,now,ztFinalDest,_config,localCapabilityIndex,false);
Packet outp(ztFinalDest,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)0x04);
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,frameLen);
outp.compress();
RR->sw->send(outp,true);
return false; // DROP locally, since we redirected
} else {
return true;
}
} else {
return false;
}
}
int Network::filterIncomingPacket(
const SharedPtr<Peer> &sourcePeer,
const Address &ztDest,
const MAC &macSource,
const MAC &macDest,
const uint8_t *frameData,
const unsigned int frameLen,
const unsigned int etherType,
const unsigned int vlanId)
{
Address ztFinalDest(ztDest);
int accept = 0;
Mutex::Lock _l(_lock);
Membership &membership = _membership(sourcePeer->address());
Address cc;
unsigned int ccLength = 0;
bool ccWatch = false;
switch (_doZtFilter(RR,_config,&membership,true,sourcePeer->address(),ztFinalDest,macSource,macDest,frameData,frameLen,etherType,vlanId,_config.rules,_config.ruleCount,cc,ccLength,ccWatch)) {
case DOZTFILTER_NO_MATCH: {
Membership::CapabilityIterator mci(membership,_config);
const Capability *c;
while ((c = mci.next())) {
ztFinalDest = ztDest; // sanity check, should be unmodified if there was no match
Address cc2;
unsigned int ccLength2 = 0;
bool ccWatch2 = false;
switch(_doZtFilter(RR,_config,&membership,true,sourcePeer->address(),ztFinalDest,macSource,macDest,frameData,frameLen,etherType,vlanId,c->rules(),c->ruleCount(),cc2,ccLength2,ccWatch2)) {
case DOZTFILTER_NO_MATCH:
case DOZTFILTER_DROP: // explicit DROP in a capability just terminates its evaluation and is an anti-pattern
break;
case DOZTFILTER_REDIRECT: // interpreted as ACCEPT but ztDest will have been changed in _doZtFilter()
case DOZTFILTER_ACCEPT:
accept = 1; // ACCEPT
break;
case DOZTFILTER_SUPER_ACCEPT:
accept = 2; // super-ACCEPT
break;
}
if (accept) {
if (cc2) {
_membership(cc2).pushCredentials(RR,RR->node->now(),cc2,_config,-1,false);
Packet outp(cc2,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)(ccWatch2 ? 0x1c : 0x08));
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,ccLength2);
outp.compress();
RR->sw->send(outp,true);
}
break;
}
}
} break;
case DOZTFILTER_DROP:
return 0; // DROP
case DOZTFILTER_REDIRECT: // interpreted as ACCEPT but ztFinalDest will have been changed in _doZtFilter()
case DOZTFILTER_ACCEPT:
accept = 1; // ACCEPT
break;
case DOZTFILTER_SUPER_ACCEPT:
accept = 2; // super-ACCEPT
break;
}
if (accept) {
if (cc) {
_membership(cc).pushCredentials(RR,RR->node->now(),cc,_config,-1,false);
Packet outp(cc,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)(ccWatch ? 0x1c : 0x08));
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,ccLength);
outp.compress();
RR->sw->send(outp,true);
}
if ((ztDest != ztFinalDest)&&(ztFinalDest)) {
_membership(ztFinalDest).pushCredentials(RR,RR->node->now(),ztFinalDest,_config,-1,false);
Packet outp(ztFinalDest,RR->identity.address(),Packet::VERB_EXT_FRAME);
outp.append(_id);
outp.append((uint8_t)0x0a);
macDest.appendTo(outp);
macSource.appendTo(outp);
outp.append((uint16_t)etherType);
outp.append(frameData,frameLen);
outp.compress();
RR->sw->send(outp,true);
return 0; // DROP locally, since we redirected
}
}
return accept;
}
bool Network::subscribedToMulticastGroup(const MulticastGroup &mg,bool includeBridgedGroups) const
{
Mutex::Lock _l(_lock);
if (std::binary_search(_myMulticastGroups.begin(),_myMulticastGroups.end(),mg))
return true;
else if (includeBridgedGroups)
return _multicastGroupsBehindMe.contains(mg);
return false;
}
void Network::multicastSubscribe(const MulticastGroup &mg)
{
Mutex::Lock _l(_lock);
if (!std::binary_search(_myMulticastGroups.begin(),_myMulticastGroups.end(),mg)) {
_myMulticastGroups.insert(std::upper_bound(_myMulticastGroups.begin(),_myMulticastGroups.end(),mg),mg);
_sendUpdatesToMembers(&mg);
}
}
void Network::multicastUnsubscribe(const MulticastGroup &mg)
{
Mutex::Lock _l(_lock);
std::vector<MulticastGroup>::iterator i(std::lower_bound(_myMulticastGroups.begin(),_myMulticastGroups.end(),mg));
if ( (i != _myMulticastGroups.end()) && (*i == mg) )
_myMulticastGroups.erase(i);
}
uint64_t Network::handleConfigChunk(const Packet &chunk,unsigned int ptr)
{
const unsigned int start = ptr;
ptr += 8; // skip network ID, which is already obviously known
const unsigned int chunkLen = chunk.at<uint16_t>(ptr); ptr += 2;
const void *chunkData = chunk.field(ptr,chunkLen); ptr += chunkLen;
NetworkConfig *nc = (NetworkConfig *)0;
uint64_t configUpdateId;
{
Mutex::Lock _l(_lock);
_IncomingConfigChunk *c = (_IncomingConfigChunk *)0;
uint64_t chunkId = 0;
unsigned long totalLength,chunkIndex;
if (ptr < chunk.size()) {
const bool fastPropagate = ((chunk[ptr++] & 0x01) != 0);
configUpdateId = chunk.at<uint64_t>(ptr); ptr += 8;
totalLength = chunk.at<uint32_t>(ptr); ptr += 4;
chunkIndex = chunk.at<uint32_t>(ptr); ptr += 4;
if (((chunkIndex + chunkLen) > totalLength)||(totalLength >= ZT_NETWORKCONFIG_DICT_CAPACITY)) { // >= since we need room for a null at the end
TRACE("discarded chunk from %s: invalid length or length overflow",chunk.source().toString().c_str());
return 0;
}
if ((chunk[ptr] != 1)||(chunk.at<uint16_t>(ptr + 1) != ZT_C25519_SIGNATURE_LEN)) {
TRACE("discarded chunk from %s: unrecognized signature type",chunk.source().toString().c_str());
return 0;
}
const uint8_t *sig = reinterpret_cast<const uint8_t *>(chunk.field(ptr + 3,ZT_C25519_SIGNATURE_LEN));
// We can use the signature, which is unique per chunk, to get a per-chunk ID for local deduplication use
for(unsigned int i=0;i<16;++i)
reinterpret_cast<uint8_t *>(&chunkId)[i & 7] ^= sig[i];
// Find existing or new slot for this update and check if this is a duplicate chunk
for(int i=0;i<ZT_NETWORK_MAX_INCOMING_UPDATES;++i) {
if (_incomingConfigChunks[i].updateId == configUpdateId) {
c = &(_incomingConfigChunks[i]);
for(unsigned long j=0;j<c->haveChunks;++j) {
if (c->haveChunkIds[j] == chunkId)
return 0;
}
break;
} else if ((!c)||(_incomingConfigChunks[i].ts < c->ts)) {
c = &(_incomingConfigChunks[i]);
}
}
// If it's not a duplicate, check chunk signature
const Identity controllerId(RR->topology->getIdentity(controller()));
if (!controllerId) { // we should always have the controller identity by now, otherwise how would we have queried it the first time?
TRACE("unable to verify chunk from %s: don't have controller identity",chunk.source().toString().c_str());
return 0;
}
if (!controllerId.verify(chunk.field(start,ptr - start),ptr - start,sig,ZT_C25519_SIGNATURE_LEN)) {
TRACE("discarded chunk from %s: signature check failed",chunk.source().toString().c_str());
return 0;
}
// New properly verified chunks can be flooded "virally" through the network
if (fastPropagate) {
Address *a = (Address *)0;
Membership *m = (Membership *)0;
Hashtable<Address,Membership>::Iterator i(_memberships);
while (i.next(a,m)) {
if ((*a != chunk.source())&&(*a != controller())) {
Packet outp(*a,RR->identity.address(),Packet::VERB_NETWORK_CONFIG);
outp.append(reinterpret_cast<const uint8_t *>(chunk.data()) + start,chunk.size() - start);
RR->sw->send(outp,true);
}
}
}
} else if (chunk.source() == controller()) {
// Legacy support for OK(NETWORK_CONFIG_REQUEST) from older controllers
chunkId = chunk.packetId();
configUpdateId = chunkId;
totalLength = chunkLen;
chunkIndex = 0;
if (totalLength >= ZT_NETWORKCONFIG_DICT_CAPACITY)
return 0;
for(int i=0;i<ZT_NETWORK_MAX_INCOMING_UPDATES;++i) {
if ((!c)||(_incomingConfigChunks[i].ts < c->ts))
c = &(_incomingConfigChunks[i]);
}
} else {
TRACE("discarded single-chunk unsigned legacy config: this is only allowed if the sender is the controller itself");
return 0;
}
++c->ts; // newer is higher, that's all we need
if (c->updateId != configUpdateId) {
c->updateId = configUpdateId;
c->haveChunks = 0;
c->haveBytes = 0;
}
if (c->haveChunks >= ZT_NETWORK_MAX_UPDATE_CHUNKS)
return false;
c->haveChunkIds[c->haveChunks++] = chunkId;
memcpy(c->data.unsafeData() + chunkIndex,chunkData,chunkLen);
c->haveBytes += chunkLen;
if (c->haveBytes == totalLength) {
c->data.unsafeData()[c->haveBytes] = (char)0; // ensure null terminated
nc = new NetworkConfig();
try {
if (!nc->fromDictionary(c->data)) {
delete nc;
nc = (NetworkConfig *)0;
}
} catch ( ... ) {
delete nc;
nc = (NetworkConfig *)0;
}
}
}
if (nc) {
this->setConfiguration(*nc,true);
delete nc;
return configUpdateId;
} else {
return 0;
}
return 0;
}
int Network::setConfiguration(const NetworkConfig &nconf,bool saveToDisk)
{
// _lock is NOT locked when this is called
try {
if ((nconf.issuedTo != RR->identity.address())||(nconf.networkId != _id))
return 0;
if (_config == nconf)
return 1; // OK config, but duplicate of what we already have
ZT_VirtualNetworkConfig ctmp;
bool oldPortInitialized;
{
Mutex::Lock _l(_lock);
_config = nconf;
_lastConfigUpdate = RR->node->now();
_netconfFailure = NETCONF_FAILURE_NONE;
oldPortInitialized = _portInitialized;
_portInitialized = true;
_externalConfig(&ctmp);
}
_portError = RR->node->configureVirtualNetworkPort(_id,&_uPtr,(oldPortInitialized) ? ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_CONFIG_UPDATE : ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_UP,&ctmp);
if (saveToDisk) {
Dictionary<ZT_NETWORKCONFIG_DICT_CAPACITY> *d = new Dictionary<ZT_NETWORKCONFIG_DICT_CAPACITY>();
try {
char n[64];
Utils::snprintf(n,sizeof(n),"networks.d/%.16llx.conf",_id);
if (nconf.toDictionary(*d,false))
RR->node->dataStorePut(n,(const void *)d->data(),d->sizeBytes(),true);
} catch ( ... ) {}
delete d;
}
return 2; // OK and configuration has changed
} catch ( ... ) {
TRACE("ignored invalid configuration for network %.16llx",(unsigned long long)_id);
}
return 0;
}
void Network::requestConfiguration()
{
const Address ctrl(controller());
Dictionary<ZT_NETWORKCONFIG_METADATA_DICT_CAPACITY> rmd;
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_VERSION,(uint64_t)ZT_NETWORKCONFIG_VERSION);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_NODE_VENDOR,(uint64_t)ZT_VENDOR_ZEROTIER);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_PROTOCOL_VERSION,(uint64_t)ZT_PROTO_VERSION);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_NODE_MAJOR_VERSION,(uint64_t)ZEROTIER_ONE_VERSION_MAJOR);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_NODE_MINOR_VERSION,(uint64_t)ZEROTIER_ONE_VERSION_MINOR);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_NODE_REVISION,(uint64_t)ZEROTIER_ONE_VERSION_REVISION);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_MAX_NETWORK_RULES,(uint64_t)ZT_MAX_NETWORK_RULES);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_MAX_NETWORK_CAPABILITIES,(uint64_t)ZT_MAX_NETWORK_CAPABILITIES);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_MAX_CAPABILITY_RULES,(uint64_t)ZT_MAX_CAPABILITY_RULES);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_MAX_NETWORK_TAGS,(uint64_t)ZT_MAX_NETWORK_TAGS);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_FLAGS,(uint64_t)0);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_RULES_ENGINE_REV,(uint64_t)ZT_RULES_ENGINE_REVISION);
rmd.add(ZT_NETWORKCONFIG_REQUEST_METADATA_KEY_NODE_RELAY_POLICY,(uint64_t)RR->node->relayPolicy());
if (ctrl == RR->identity.address()) {
if (RR->localNetworkController) {
RR->localNetworkController->request(_id,InetAddress(),0xffffffffffffffffULL,RR->identity,rmd);
} else {
this->setNotFound();
}
return;
}
TRACE("requesting netconf for network %.16llx from controller %s",(unsigned long long)_id,ctrl.toString().c_str());
Packet outp(ctrl,RR->identity.address(),Packet::VERB_NETWORK_CONFIG_REQUEST);
outp.append((uint64_t)_id);
const unsigned int rmdSize = rmd.sizeBytes();
outp.append((uint16_t)rmdSize);
outp.append((const void *)rmd.data(),rmdSize);
if (_config) {
outp.append((uint64_t)_config.revision);
outp.append((uint64_t)_config.timestamp);
} else {
outp.append((unsigned char)0,16);
}
RR->node->expectReplyTo(outp.packetId());
outp.compress();
RR->sw->send(outp,true);
}
bool Network::gate(const SharedPtr<Peer> &peer)
{
const uint64_t now = RR->node->now();
Mutex::Lock _l(_lock);
try {
if (_config) {
Membership *m = _memberships.get(peer->address());
if ( (_config.isPublic()) || ((m)&&(m->isAllowedOnNetwork(_config))) ) {
if (!m)
m = &(_membership(peer->address()));
m->pushCredentials(RR,now,peer->address(),_config,-1,false);
if (m->shouldLikeMulticasts(now)) {
_announceMulticastGroupsTo(peer->address(),_allMulticastGroups());
m->likingMulticasts(now);
}
return true;
}
}
} catch ( ... ) {
TRACE("gate() check failed for peer %s: unexpected exception",peer->address().toString().c_str());
}
return false;
}
void Network::clean()
{
const uint64_t now = RR->node->now();
Mutex::Lock _l(_lock);
if (_destroyed)
return;
{
Hashtable< MulticastGroup,uint64_t >::Iterator i(_multicastGroupsBehindMe);
MulticastGroup *mg = (MulticastGroup *)0;
uint64_t *ts = (uint64_t *)0;
while (i.next(mg,ts)) {
if ((now - *ts) > (ZT_MULTICAST_LIKE_EXPIRE * 2))
_multicastGroupsBehindMe.erase(*mg);
}
}
{
Address *a = (Address *)0;
Membership *m = (Membership *)0;
Hashtable<Address,Membership>::Iterator i(_memberships);
while (i.next(a,m)) {
if (!RR->topology->getPeerNoCache(*a))
_memberships.erase(*a);
}
}
}
void Network::learnBridgeRoute(const MAC &mac,const Address &addr)
{
Mutex::Lock _l(_lock);
_remoteBridgeRoutes[mac] = addr;
// Anti-DOS circuit breaker to prevent nodes from spamming us with absurd numbers of bridge routes
while (_remoteBridgeRoutes.size() > ZT_MAX_BRIDGE_ROUTES) {
Hashtable< Address,unsigned long > counts;
Address maxAddr;
unsigned long maxCount = 0;
MAC *m = (MAC *)0;
Address *a = (Address *)0;
// Find the address responsible for the most entries
{
Hashtable<MAC,Address>::Iterator i(_remoteBridgeRoutes);
while (i.next(m,a)) {
const unsigned long c = ++counts[*a];
if (c > maxCount) {
maxCount = c;
maxAddr = *a;
}
}
}
// Kill this address from our table, since it's most likely spamming us
{
Hashtable<MAC,Address>::Iterator i(_remoteBridgeRoutes);
while (i.next(m,a)) {
if (*a == maxAddr)
_remoteBridgeRoutes.erase(*m);
}
}
}
}
void Network::learnBridgedMulticastGroup(const MulticastGroup &mg,uint64_t now)
{
Mutex::Lock _l(_lock);
const unsigned long tmp = (unsigned long)_multicastGroupsBehindMe.size();
_multicastGroupsBehindMe.set(mg,now);
if (tmp != _multicastGroupsBehindMe.size())
_sendUpdatesToMembers(&mg);
}
Membership::AddCredentialResult Network::addCredential(const CertificateOfMembership &com)
{
if (com.networkId() != _id)
return Membership::ADD_REJECTED;
const Address a(com.issuedTo());
Mutex::Lock _l(_lock);
Membership &m = _membership(a);
const Membership::AddCredentialResult result = m.addCredential(RR,_config,com);
if ((result == Membership::ADD_ACCEPTED_NEW)||(result == Membership::ADD_ACCEPTED_REDUNDANT)) {
m.pushCredentials(RR,RR->node->now(),a,_config,-1,false);
RR->mc->addCredential(com,true);
}
return result;
}
Membership::AddCredentialResult Network::addCredential(const Address &sentFrom,const Revocation &rev)
{
if (rev.networkId() != _id)
return Membership::ADD_REJECTED;
Mutex::Lock _l(_lock);
Membership &m = _membership(rev.target());
const Membership::AddCredentialResult result = m.addCredential(RR,_config,rev);
if ((result == Membership::ADD_ACCEPTED_NEW)&&(rev.fastPropagate())) {
Address *a = (Address *)0;
Membership *m = (Membership *)0;
Hashtable<Address,Membership>::Iterator i(_memberships);
while (i.next(a,m)) {
if ((*a != sentFrom)&&(*a != rev.signer())) {
Packet outp(*a,RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
outp.append((uint8_t)0x00); // no COM
outp.append((uint16_t)0); // no capabilities
outp.append((uint16_t)0); // no tags
outp.append((uint16_t)1); // one revocation!
rev.serialize(outp);
RR->sw->send(outp,true);
}
}
}
return result;
}
void Network::destroy()
{
Mutex::Lock _l(_lock);
_destroyed = true;
}
ZT_VirtualNetworkStatus Network::_status() const
{
// assumes _lock is locked
if (_portError)
return ZT_NETWORK_STATUS_PORT_ERROR;
switch(_netconfFailure) {
case NETCONF_FAILURE_ACCESS_DENIED:
return ZT_NETWORK_STATUS_ACCESS_DENIED;
case NETCONF_FAILURE_NOT_FOUND:
return ZT_NETWORK_STATUS_NOT_FOUND;
case NETCONF_FAILURE_NONE:
return ((_config) ? ZT_NETWORK_STATUS_OK : ZT_NETWORK_STATUS_REQUESTING_CONFIGURATION);
default:
return ZT_NETWORK_STATUS_PORT_ERROR;
}
}
void Network::_externalConfig(ZT_VirtualNetworkConfig *ec) const
{
// assumes _lock is locked
ec->nwid = _id;
ec->mac = _mac.toInt();
if (_config)
Utils::scopy(ec->name,sizeof(ec->name),_config.name);
else ec->name[0] = (char)0;
ec->status = _status();
ec->type = (_config) ? (_config.isPrivate() ? ZT_NETWORK_TYPE_PRIVATE : ZT_NETWORK_TYPE_PUBLIC) : ZT_NETWORK_TYPE_PRIVATE;
ec->mtu = ZT_IF_MTU;
ec->physicalMtu = ZT_UDP_DEFAULT_PAYLOAD_MTU - (ZT_PACKET_IDX_PAYLOAD + 16);
ec->dhcp = 0;
std::vector<Address> ab(_config.activeBridges());
ec->bridge = ((_config.allowPassiveBridging())||(std::find(ab.begin(),ab.end(),RR->identity.address()) != ab.end())) ? 1 : 0;
ec->broadcastEnabled = (_config) ? (_config.enableBroadcast() ? 1 : 0) : 0;
ec->portError = _portError;
ec->netconfRevision = (_config) ? (unsigned long)_config.revision : 0;
ec->assignedAddressCount = 0;
for(unsigned int i=0;i<ZT_MAX_ZT_ASSIGNED_ADDRESSES;++i) {
if (i < _config.staticIpCount) {
memcpy(&(ec->assignedAddresses[i]),&(_config.staticIps[i]),sizeof(struct sockaddr_storage));
++ec->assignedAddressCount;
} else {
memset(&(ec->assignedAddresses[i]),0,sizeof(struct sockaddr_storage));
}
}
ec->routeCount = 0;
for(unsigned int i=0;i<ZT_MAX_NETWORK_ROUTES;++i) {
if (i < _config.routeCount) {
memcpy(&(ec->routes[i]),&(_config.routes[i]),sizeof(ZT_VirtualNetworkRoute));
++ec->routeCount;
} else {
memset(&(ec->routes[i]),0,sizeof(ZT_VirtualNetworkRoute));
}
}
}
void Network::_sendUpdatesToMembers(const MulticastGroup *const newMulticastGroup)
{
// Assumes _lock is locked
const uint64_t now = RR->node->now();
std::vector<MulticastGroup> groups;
if (newMulticastGroup)
groups.push_back(*newMulticastGroup);
else groups = _allMulticastGroups();
if ((newMulticastGroup)||((now - _lastAnnouncedMulticastGroupsUpstream) >= ZT_MULTICAST_ANNOUNCE_PERIOD)) {
if (!newMulticastGroup)
_lastAnnouncedMulticastGroupsUpstream = now;
// Announce multicast groups to upstream peers (roots, etc.) and also send
// them our COM so that MULTICAST_GATHER can be authenticated properly.
const std::vector<Address> upstreams(RR->topology->upstreamAddresses());
for(std::vector<Address>::const_iterator a(upstreams.begin());a!=upstreams.end();++a) {
if (_config.com) {
Packet outp(*a,RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
_config.com.serialize(outp);
outp.append((uint8_t)0x00);
RR->sw->send(outp,true);
}
_announceMulticastGroupsTo(*a,groups);
}
// Also announce to controller, and send COM to simplify and generalize behavior even though in theory it does not need it
const Address c(controller());
if ( (std::find(upstreams.begin(),upstreams.end(),c) == upstreams.end()) && (!_memberships.contains(c)) ) {
if (_config.com) {
Packet outp(c,RR->identity.address(),Packet::VERB_NETWORK_CREDENTIALS);
_config.com.serialize(outp);
outp.append((uint8_t)0x00);
RR->sw->send(outp,true);
}
_announceMulticastGroupsTo(c,groups);
}
}
// Make sure that all "network anchors" have Membership records so we will
// push multicasts to them. Note that _membership() also does this but in a
// piecemeal on-demand fashion.
const std::vector<Address> anchors(_config.anchors());
for(std::vector<Address>::const_iterator a(anchors.begin());a!=anchors.end();++a)
_membership(*a);
// Send credentials and multicast LIKEs to members, upstreams, and controller
{
Address *a = (Address *)0;
Membership *m = (Membership *)0;
Hashtable<Address,Membership>::Iterator i(_memberships);
while (i.next(a,m)) {
m->pushCredentials(RR,now,*a,_config,-1,false);
if ( ((newMulticastGroup)||(m->shouldLikeMulticasts(now))) && (m->isAllowedOnNetwork(_config)) ) {
if (!newMulticastGroup)
m->likingMulticasts(now);
_announceMulticastGroupsTo(*a,groups);
}
}
}
}
void Network::_announceMulticastGroupsTo(const Address &peer,const std::vector<MulticastGroup> &allMulticastGroups)
{
// Assumes _lock is locked
Packet outp(peer,RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
for(std::vector<MulticastGroup>::const_iterator mg(allMulticastGroups.begin());mg!=allMulticastGroups.end();++mg) {
if ((outp.size() + 24) >= ZT_PROTO_MAX_PACKET_LENGTH) {
outp.compress();
RR->sw->send(outp,true);
outp.reset(peer,RR->identity.address(),Packet::VERB_MULTICAST_LIKE);
}
// network ID, MAC, ADI
outp.append((uint64_t)_id);
mg->mac().appendTo(outp);
outp.append((uint32_t)mg->adi());
}
if (outp.size() > ZT_PROTO_MIN_PACKET_LENGTH) {
outp.compress();
RR->sw->send(outp,true);
}
}
std::vector<MulticastGroup> Network::_allMulticastGroups() const
{
// Assumes _lock is locked
std::vector<MulticastGroup> mgs;
mgs.reserve(_myMulticastGroups.size() + _multicastGroupsBehindMe.size() + 1);
mgs.insert(mgs.end(),_myMulticastGroups.begin(),_myMulticastGroups.end());
_multicastGroupsBehindMe.appendKeys(mgs);
if ((_config)&&(_config.enableBroadcast()))
mgs.push_back(Network::BROADCAST);
std::sort(mgs.begin(),mgs.end());
mgs.erase(std::unique(mgs.begin(),mgs.end()),mgs.end());
return mgs;
}
Membership &Network::_membership(const Address &a)
{
// assumes _lock is locked
return _memberships[a];
}
} // namespace ZeroTier
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