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only send Version Negotiation packets for packets larger than 1200 bytes

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This commit is contained in:
Marten Seemann 2020-10-08 12:51:51 +07:00
parent fb22bb38ea
commit 0615d92ede
3 changed files with 35 additions and 1 deletions
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7
server.go
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@ -351,6 +351,13 @@ func (s *baseServer) handlePacketImpl(p *receivedPacket) bool /* is the buffer s
}
// send a Version Negotiation Packet if the client is speaking a different protocol version
if !protocol.IsSupportedVersion(s.config.Versions, hdr.Version) {
if p.Size() < protocol.MinUnknownVersionPacketSize {
s.logger.Debugf("Dropping a packet with an unknown version that is too small (%d bytes)", p.Size())
if s.config.Tracer != nil {
s.config.Tracer.DroppedPacket(p.remoteAddr, logging.PacketTypeNotDetermined, p.Size(), logging.PacketDropUnexpectedPacket)
}
return false
}
go s.sendVersionNegotiationPacket(p, hdr)
return false
}