mirror of
https://github.com/zerotier/ZeroTierOne.git
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109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2024-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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/****/
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#ifndef ZT_INCOMINGPACKET_HPP
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#define ZT_INCOMINGPACKET_HPP
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#include "Path.hpp"
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#include "Utils.hpp"
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#include "MulticastGroup.hpp"
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#include "Peer.hpp"
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#include "Buf.hpp"
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#include "Protocol.hpp"
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/*
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* The big picture:
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*
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* tryDecode gets called for a given fully-assembled packet until it returns
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* true or the packet's time to live has been exceeded, in which case it is
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* discarded as failed decode. Any exception thrown by tryDecode also causes
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* the packet to be discarded.
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*
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* Thus a return of false from tryDecode() indicates that it should be called
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* again. Logic is very simple as to when, and it's in doAnythingWaitingForPeer
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* in Switch. This might be expanded to be more fine grained in the future.
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*
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* A return value of true indicates that the packet is done. tryDecode must
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* never be called again after that.
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*/
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namespace ZeroTier {
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class RuntimeEnvironment;
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class Network;
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class IncomingPacket
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{
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public:
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ZT_ALWAYS_INLINE IncomingPacket() {}
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template<typename X>
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ZT_ALWAYS_INLINE void set(const SharedPtr< Buf<X> > &pkt_,const unsigned int pktSize_,const SharedPtr<Path> &path_,const int64_t now_)
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{
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idBE = 0; // initially zero, set when decryption/auth occurs
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receiveTime = now_;
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path = path_;
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pkt = reinterpret_cast< SharedPtr< Buf< Protocol::Header > > >(pkt_);
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size = pktSize_;
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hops = Protocol::packetHops(pkt->data.fields);
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}
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/**
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* Attempt to decode this packet
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*
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* Note that this returns 'true' if processing is complete. This says nothing
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* about whether the packet was valid. A rejection is 'complete.'
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*
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* Once true is returned, this must not be called again. The packet's state
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* may no longer be valid.
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*
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* @param RR Runtime environment
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* @param tPtr Thread pointer to be handed through to any callbacks called as a result of this call
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* @return True if decoding and processing is complete, false if caller should try again
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*/
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bool tryDecode(const RuntimeEnvironment *RR,void *tPtr);
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/**
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* Packet ID in big-endian byte order or 0 if not decrypted/dearmored yet
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*/
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uint64_t idBE;
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/**
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* Time packet was received
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*/
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int64_t receiveTime;
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/**
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* Path over which packet was received
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*/
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SharedPtr< Path > path;
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/**
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* Packet itself
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*/
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SharedPtr< Buf< Protocol::Header > > pkt;
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/**
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* Size of packet in bytes
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*/
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unsigned int size;
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/**
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* Hop count for received packet
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*/
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uint8_t hops;
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};
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} // namespace ZeroTier
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#endif
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