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Add UDP MTU configurability.

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This commit is contained in:
Adam Ierymenko 2017-09-01 16:25:34 -07:00
parent 2d858b05ac
commit f8014413a3
11 changed files with 134 additions and 84 deletions
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13
node/Switch.cpp
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@ -722,10 +722,13 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt)
return false;
}
unsigned int chunkSize = std::min(packet.size(),(unsigned int)ZT_UDP_DEFAULT_PAYLOAD_MTU);
unsigned int mtu = ZT_DEFAULT_PHYSMTU;
uint64_t trustedPathId = 0;
RR->topology->getOutboundPathInfo(viaPath->address(),mtu,trustedPathId);
unsigned int chunkSize = std::min(packet.size(),mtu);
packet.setFragmented(chunkSize < packet.size());
const uint64_t trustedPathId = RR->topology->getOutboundPathTrust(viaPath->address());
if (trustedPathId) {
packet.setTrusted(trustedPathId);
} else {
@ -737,13 +740,13 @@ bool Switch::_trySend(void *tPtr,Packet &packet,bool encrypt)
// Too big for one packet, fragment the rest
unsigned int fragStart = chunkSize;
unsigned int remaining = packet.size() - chunkSize;
unsigned int fragsRemaining = (remaining / (ZT_UDP_DEFAULT_PAYLOAD_MTU - ZT_PROTO_MIN_FRAGMENT_LENGTH));
if ((fragsRemaining * (ZT_UDP_DEFAULT_PAYLOAD_MTU - ZT_PROTO_MIN_FRAGMENT_LENGTH)) < remaining)
unsigned int fragsRemaining = (remaining / (mtu - ZT_PROTO_MIN_FRAGMENT_LENGTH));
if ((fragsRemaining * (mtu - ZT_PROTO_MIN_FRAGMENT_LENGTH)) < remaining)
++fragsRemaining;
const unsigned int totalFragments = fragsRemaining + 1;
for(unsigned int fno=1;fno<totalFragments;++fno) {
chunkSize = std::min(remaining,(unsigned int)(ZT_UDP_DEFAULT_PAYLOAD_MTU - ZT_PROTO_MIN_FRAGMENT_LENGTH));
chunkSize = std::min(remaining,(unsigned int)(mtu - ZT_PROTO_MIN_FRAGMENT_LENGTH));
Packet::Fragment frag(packet,fragStart,chunkSize,fno,totalFragments);
viaPath->send(RR,tPtr,frag.data(),frag.size(),now);
fragStart += chunkSize;