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Enable ff:ff:ff:ff:ff:ff w/no ADI a.k.a. broadcast. YOLO.

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This commit is contained in:
Adam Ierymenko 2013-07-06 15:56:12 -04:00
parent 7f3dea018c
commit 2eaac3891e
3 changed files with 16 additions and 3 deletions
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8
node/EthernetTap.cpp
View File

@ -31,6 +31,10 @@
#include "Logger.hpp"
#include "RuntimeEnvironment.hpp"
#include "Mutex.hpp"
#include "MulticastGroup.hpp"
// ff:ff:ff:ff:ff:ff with no ADI
static const ZeroTier::MulticastGroup _blindWildcardMulticastGroup(ZeroTier::MAC(0xff),0);
/* ======================================================================== */
#if defined(__linux__) || defined(linux) || defined(__LINUX__) || defined(__linux)
@ -337,6 +341,8 @@ bool EthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
bool changed = false;
newGroups.insert(_blindWildcardMulticastGroup); // always join this
for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
if (!groups.count(*mg)) {
groups.insert(*mg);
@ -658,6 +664,8 @@ bool EthernetTap::updateMulticastGroups(std::set<MulticastGroup> &groups)
bool changed = false;
newGroups.insert(_blindWildcardMulticastGroup); // always join this
for(std::set<MulticastGroup>::iterator mg(newGroups.begin());mg!=newGroups.end();++mg) {
if (!groups.count(*mg)) {
groups.insert(*mg);

3
node/EthernetTap.hpp
View File

@ -164,6 +164,9 @@ public:
* This populates a set or, if already populated, modifies it to contain
* only multicast groups in which this device is interested.
*
* This should always include the blind wildcard MulticastGroup (MAC of
* ff:ff:ff:ff:ff:ff and 0 ADI field).
*
* @param groups Set to modify in place
* @return True if set was changed since last call
*/

8
node/Switch.cpp
View File

@ -252,9 +252,11 @@ void Switch::onLocalEthernet(const SharedPtr<Network> &network,const MAC &from,c
if (to.isMulticast()) {
MulticastGroup mg(to,0);
// Handle special cases: IPv4 ARP
if ((etherType == ZT_ETHERTYPE_ARP)&&(data.size() == 28)&&(data[2] == 0x08)&&(data[3] == 0x00)&&(data[4] == 6)&&(data[5] == 4)&&(data[7] == 0x01))
mg = MulticastGroup::deriveMulticastGroupForAddressResolution(InetAddress(data.field(24,4),4,0));
if (to.isBroadcast()) {
// Cram IPv4 IP into ADI field to make IPv4 ARP broadcast channel specific and scalable
if ((etherType == ZT_ETHERTYPE_ARP)&&(data.size() == 28)&&(data[2] == 0x08)&&(data[3] == 0x00)&&(data[4] == 6)&&(data[5] == 4)&&(data[7] == 0x01))
mg = MulticastGroup::deriveMulticastGroupForAddressResolution(InetAddress(data.field(24,4),4,0));
}
// Remember this message's CRC, but don't drop if we've already seen it
// since it's our own.