mirror of
https://github.com/RetroShare/RetroShare.git
synced 2024-12-26 07:59:35 -05:00
Rework of tcponudp/tcpstream should make UDP connections much more stable.
- Fixed retransmit algorithm. Much more closely matched to TCP standard: http://tools.ietf.org/html/rfc2988 - This increases retransmit timeouts, and reduces the number of packets resent. - Added better debugging for retrans/close as separate #defines. - Further testing is required ;) git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5252 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
drbob
parent
6e536ae67e
commit
bc7b42d81f
@ -29,6 +29,7 @@
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#include "tcpstream.h"
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#include <iostream>
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#include <iomanip>
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#include <assert.h>
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#include <errno.h>
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#include <math.h>
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@ -47,8 +48,13 @@ const int rstcpstreamzone = 28455;
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/*
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* #define DEBUG_TCP_STREAM 1
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* #define DEBUG_TCP_STREAM_RETRANS 1
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* #define DEBUG_TCP_STREAM_CLOSE 1
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*/
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//#define DEBUG_TCP_STREAM_RETRANS 1
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//#define DEBUG_TCP_STREAM_CLOSE 1
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/*
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*#define DEBUG_TCP_STREAM_EXTRA 1
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*/
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@ -63,13 +69,15 @@ int setupBinaryCheck(std::string fname);
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#endif
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static const uint32 kMaxQueueSize = 300; // Was 100, which means max packet size of 100k (smaller than max packet size).
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static const uint32 kMaxPktRetransmit = 20;
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static const uint32 kMaxPktRetransmit = 10;
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static const uint32 kMaxSynPktRetransmit = 100; // 100 => 200secs = over 3 minutes startup
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static const int TCP_STD_TTL = 64;
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static const int TCP_DEFAULT_FIREWALL_TTL = 4;
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static const double RTT_ALPHA = 0.875;
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int dumpPacket(std::ostream &out, unsigned char *pkt, uint32_t size);
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// platform independent fractional timestamp.
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static double getCurrentTS();
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@ -82,7 +90,9 @@ TcpStream::TcpStream(UdpSubReceiver *lyr)
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inAckno(0), inWinSize(0),
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maxWinSize(TCP_MAX_WIN),
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keepAliveTimeout(TCP_ALIVE_TIMEOUT),
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retransTimerOn(false),
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retransTimeout(TCP_RETRANS_TIMEOUT),
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retransTimerTs(0),
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lastWriteTF(0),lastReadTF(0),
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wcount(0), rcount(0),
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errorState(0),
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@ -304,6 +314,17 @@ int TcpStream::status(std::ostream &out)
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{
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tcpMtx.lock(); /********** LOCK MUTEX *********/
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int s = status_locked(out);
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tcpMtx.unlock(); /******** UNLOCK MUTEX *********/
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return s;
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}
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int TcpStream::status_locked(std::ostream &out)
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{
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int tmpstate = state;
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// can leave the timestamp here as time()... rough but okay.
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@ -328,8 +349,6 @@ int TcpStream::status(std::ostream &out)
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out << std::endl;
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out << std::endl;
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tcpMtx.unlock(); /******** UNLOCK MUTEX *********/
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return tmpstate;
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}
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@ -993,6 +1012,13 @@ int TcpStream::recv_check()
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* for max efficiency
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*/
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#ifdef DEBUG_TCP_STREAM_CLOSE
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std::cerr << "TcpStream::recv_check() state = CLOSED (NoPktTimeout)";
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std::cerr << std::endl;
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dumpstate_locked(std::cerr);
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#endif
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rslog(RSL_WARNING, rstcpstreamzone, "TcpStream::state => TCP_CLOSED (kNoPktTimeout)");
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outStreamActive = false;
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@ -1165,6 +1191,13 @@ int TcpStream::handleIncoming(TcpPacket *pkt)
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* timeout of this state.
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*
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*/
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#ifdef DEBUG_TCP_STREAM_CLOSE
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std::cerr << "TcpStream::handleIncoming() state = CLOSED (TimedWait)";
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std::cerr << std::endl;
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dumpstate_locked(std::cerr);
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#endif
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state = TCP_CLOSED;
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// return incoming_TimedWait(pkt);
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{
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@ -1746,12 +1779,14 @@ int TcpStream::check_InPkts()
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}
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else if (state == TCP_LAST_ACK)
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{
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state = TCP_CLOSED;
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::state = TCP_CLOSED";
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#ifdef DEBUG_TCP_STREAM_CLOSE
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std::cerr << "TcpStream::state = TCP_CLOSED (LastAck)";
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std::cerr << std::endl;
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dumpstate_locked(std::cerr);
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#endif
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state = TCP_CLOSED;
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rslog(RSL_WARNING, rstcpstreamzone, "TcpStream::state => TCP_CLOSED (LAST_ACK, recvd ACK)");
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cleanup();
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@ -1896,6 +1931,9 @@ int TcpStream::toSend(TcpPacket *pkt, bool retrans)
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/* restart timers */
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pkt -> ts = cts;
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pkt -> retrans = 0;
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startRetransmitTimer();
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::toSend() Adding to outPkt --> Seqno: ";
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std::cerr << pkt->seqno << " size: " << pkt->datasize;
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@ -1912,12 +1950,90 @@ int TcpStream::toSend(TcpPacket *pkt, bool retrans)
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}
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/* single retransmit timer.
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*
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*/
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void TcpStream::startRetransmitTimer()
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{
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if (retransTimerOn)
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{
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return;
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}
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retransTimerTs = getCurrentTS();
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retransTimerOn = true;
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::startRetransmitTimer() peer: " << peeraddr;
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std::cerr << " retransTimeout: " << retransTimeout;
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std::cerr << " retransTimerTs: " << std::setprecision(12) <<retransTimerTs;
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std::cerr << std::endl;
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#endif
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}
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void TcpStream::restartRetransmitTimer()
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{
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stopRetransmitTimer();
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startRetransmitTimer();
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}
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void TcpStream::stopRetransmitTimer()
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{
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if (!retransTimerOn)
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{
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return;
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}
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::stopRetransmitTimer() peer: " << peeraddr;
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std::cerr << std::endl;
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#endif
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retransTimerOn = false;
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}
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void TcpStream::resetRetransmitTimer()
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{
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retransTimerOn = false;
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retransTimeout = 2.0 * (rtt_est + 4.0 * rtt_dev);
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// happens too often for RETRANS debugging.
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::resetRetransmitTimer() peer: " << peeraddr;
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std::cerr << " retransTimeout: " << std::setprecision(12) << retransTimeout;
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std::cerr << std::endl;
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#endif
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}
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void TcpStream::incRetransmitTimeout()
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{
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retransTimeout = 2 * retransTimeout;
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if (retransTimeout > TCP_RETRANS_MAX_TIMEOUT)
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{
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retransTimeout = TCP_RETRANS_MAX_TIMEOUT;
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}
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#ifdef DEBUG_TCP_STREAM_RETRANS
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std::cerr << "TcpStream::incRetransmitTimer() peer: " << peeraddr;
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std::cerr << " retransTimeout: " << std::setprecision(12) << retransTimeout;
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std::cerr << std::endl;
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#endif
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}
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int TcpStream::retrans()
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{
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int outPktSize = MAX_SEG + TCP_PSEUDO_HDR_SIZE;
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char tmpOutPkt[outPktSize];
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bool updateCongestion = true;
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if (!peerKnown)
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{
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@ -1929,25 +2045,37 @@ int TcpStream::retrans()
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return 0;
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}
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/* now retrans */
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if (!retransTimerOn)
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{
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return 0;
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}
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double cts = getCurrentTS();
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std::list<TcpPacket *>::iterator it;
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for(it = outPkt.begin(); (it != outPkt.end()); it++)
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if (cts - retransTimerTs < retransTimeout)
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{
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outPktSize = MAX_SEG + TCP_PSEUDO_HDR_SIZE;
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TcpPacket *pkt = (*it);
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if (cts - pkt->ts > retransTimeout)
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return 0;
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}
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if (outPkt.begin() == outPkt.end())
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{
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resetRetransmitTimer();
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return 0;
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}
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TcpPacket *pkt = outPkt.front();
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if (!pkt)
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{
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/* error */
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return 0;
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}
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/* retransmission -> adjust the congestWinSize and congestThreshold
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* but only once per cycle
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*/
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if (updateCongestion)
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{
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congestThreshold = congestWinSize / 2;
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congestWinSize = MAX_SEG;
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congestUpdate = outAcked + congestWinSize; // point when we can up the winSize.
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updateCongestion = false;
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::retrans() Adjusting Congestion Parameters: ";
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@ -1958,44 +2086,6 @@ int TcpStream::retrans()
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std::cerr << std::endl;
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#endif
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}
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/* before we can retranmit,
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* we need to check that its within the congestWinSize
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* -> actually only checking that the start (seqno) is within window!
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*/
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if (isOldSequence(outAcked + congestWinSize, pkt->seqno))
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{
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/* cannot send .... */
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::retrans() Retranmission Delayed by CongestionWindow";
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std::cerr << std::endl;
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std::cerr << "\toutAcked: " << outAcked;
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std::cerr << " CongestWinSize:" << congestWinSize;
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std::cerr << std::endl;
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std::cerr << "\tAttempted Packet: Seqno: ";
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std::cerr << pkt->seqno << " size: " << pkt->datasize;
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std::cerr << " retrans: " << (int) pkt->retrans;
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std::cerr << " timeout: " << retransTimeout;
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std::cerr << std::endl;
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#endif
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/* as packets in order, can drop out of the fn now */
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return 0;
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}
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::retrans() Seqno: ";
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std::cerr << pkt->seqno << " size: " << pkt->datasize;
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std::cerr << " retrans: " << (int) pkt->retrans;
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std::cerr << " timeout: " << retransTimeout;
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std::cerr << std::endl;
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#endif
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/* update ackno and winsize */
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if (!(pkt->hasSyn()))
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{
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@ -2008,17 +2098,23 @@ int TcpStream::retrans()
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keepAliveTimer = cts;
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(*it) -> writePacket(tmpOutPkt, outPktSize);
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pkt->writePacket(tmpOutPkt, outPktSize);
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::retrans() ReSending Pkt" << std::endl;
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std::cerr << "TcpStream::retrans Seqno: ";
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std::cerr << (*it)->seqno << " size: " << (*it)->datasize;
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#ifdef DEBUG_TCP_STREAM_RETRANS
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std::cerr << "TcpStream::retrans()";
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std::cerr << " peer: " << peeraddr;
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std::cerr << " hasSyn: " << pkt->hasSyn();
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std::cerr << " Seqno: ";
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std::cerr << pkt->seqno << " size: " << pkt->datasize;
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std::cerr << " Ackno: ";
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std::cerr << (*it)->ackno << " winsize: " << (*it)->winsize;
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std::cerr << pkt->ackno << " winsize: " << pkt->winsize;
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std::cerr << " retrans: " << (int) pkt->retrans;
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std::cerr << " timeout: " << std::setprecision(12) << retransTimeout;
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std::cerr << std::endl;
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//std::cerr << printPkt(tmpOutPkt, outPktSize) << std::endl;
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#endif
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/* if its a syn packet ** thats been
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* transmitting for a while, maybe
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* we should increase the ttl.
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@ -2044,8 +2140,6 @@ int TcpStream::retrans()
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#ifdef DEBUG_TCP_STREAM
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std::cerr << out.str() << std::endl;
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#endif
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}
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/* catch excessive retransmits
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@ -2065,14 +2159,17 @@ int TcpStream::retrans()
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((!pkt->hasSyn()) && (pkt->retrans > kMaxPktRetransmit)))
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{
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/* too many attempts close stream */
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#ifdef DEBUG_TCP_STREAM
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#ifdef DEBUG_TCP_STREAM_CLOSE
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std::cerr << "TcpStream::retrans() Too many Retransmission Attempts (";
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std::cerr << (int) pkt->retrans << ") for Pkt" << std::endl;
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std::cerr << (int) pkt->retrans << ") for Peer: " << peeraddr << std::endl;
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std::cerr << "TcpStream::retrans() Closing Socket Connection";
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std::cerr << std::endl;
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#endif
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//dumpPacket(std::cerr, (unsigned char *) tmpOutPkt, outPktSize);
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dumpstate_locked(std::cerr);
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#endif
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rslog(RSL_WARNING,rstcpstreamzone,"TcpStream::state => TCP_CLOSED (Too Many Retransmits)");
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@ -2087,26 +2184,25 @@ int TcpStream::retrans()
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udp -> sendPkt(tmpOutPkt, outPktSize, peeraddr, ttl);
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/* restart timers */
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(*it) -> ts = cts;
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(*it) -> retrans++;
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pkt->ts = cts;
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pkt->retrans++;
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/* finally - double the retransTimeout ... (Karn's Algorithm)
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* this ensures we don't retransmit all the packets that
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* following a dropped packet!
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*
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* but if we have lots of dropped this ain't going to help much!
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*
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* not doubling retransTimeout, that is can go manic and result
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* in excessive timeouts, and no data flow.
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/*
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* finally - double the retransTimeout ... (Karn's Algorithm)
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* except if we are starting a connection... i.e. hasSyn()
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*/
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retransTimeout = 2.0 * (rtt_est + 4.0 * rtt_dev);
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::retrans() Doubling std retranTimeout to:";
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std::cerr << retransTimeout;
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std::cerr << std::endl;
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#endif
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if (!pkt->hasSyn())
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{
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incRetransmitTimeout();
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restartRetransmitTimer();
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}
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else
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{
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resetRetransmitTimer();
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startRetransmitTimer();
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}
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return 1;
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}
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@ -2118,13 +2214,14 @@ void TcpStream::acknowledge()
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std::list<TcpPacket *>::iterator it;
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double cts = getCurrentTS();
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bool updateRTT = true;
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bool clearedPkts = false;
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for(it = outPkt.begin(); (it != outPkt.end()) &&
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(isOldSequence((*it)->seqno, outAcked));
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it = outPkt.erase(it))
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{
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TcpPacket *pkt = (*it);
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clearedPkts = true;
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/* adjust the congestWinSize and congestThreshold
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* congestUpdate <= outAcked
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@ -2236,11 +2333,30 @@ void TcpStream::acknowledge()
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* This will effectively trigger the retransmission of the next dropped packet.
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*/
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if (!updateRTT)
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{
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retransTimeout = rtt_est + 4.0 * rtt_dev;
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}
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/*
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* if have acked all data - resetRetransTimer()
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*/
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if (it == outPkt.end())
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{
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::acknowledge() peer: " << peeraddr;
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std::cerr << " Backlog cleared, resetRetransmitTimer";
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std::cerr << std::endl;
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#endif
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resetRetransmitTimer();
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}
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else if (clearedPkts)
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{
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#ifdef DEBUG_TCP_STREAM
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std::cerr << "TcpStream::acknowledge() peer: " << peeraddr;
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std::cerr << " Cleared some packets -> resetRetransmitTimer + start";
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std::cerr << std::endl;
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#endif
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resetRetransmitTimer();
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startRetransmitTimer();
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}
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return;
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}
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@ -2565,3 +2681,107 @@ int checkData(uint8 *data, int size, int idx)
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#endif
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/***** Dump state of TCP Stream - to workout why it was closed ****/
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int TcpStream::dumpstate_locked(std::ostream &out)
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{
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out << "TcpStream::dumpstate()";
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out << "=======================================================";
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out << std::endl;
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out << "state: " << (int) state;
|
||||
out << " errorState: " << (int) errorState;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Streams) inStreamActive: " << inStreamActive;
|
||||
out << " outStreamActive: " << outStreamActive;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Timeouts) maxWinSize: " << maxWinSize;
|
||||
out << " keepAliveTimeout: " << keepAliveTimeout;
|
||||
out << " retransTimeout: " << retransTimeout;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Timers) keepAliveTimer: " << std::setprecision(12) << keepAliveTimer;
|
||||
out << " lastIncomingPkt: " << std::setprecision(12) << lastIncomingPkt;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Tracking) lastSendAck: " << lastSentAck;
|
||||
out << " lastSendWinSize: " << lastSentWinSize;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Init) initOutSeqno: " << initOurSeqno;
|
||||
out << " initPeerSeqno: " << initPeerSeqno;
|
||||
out << std::endl;
|
||||
|
||||
out << "(r/w) lastWriteTF: " << lastWriteTF;
|
||||
out << " lastReadTF: " << lastReadTF;
|
||||
out << " wcount: " << wcount;
|
||||
out << " rcount: " << rcount;
|
||||
out << std::endl;
|
||||
|
||||
out << "(rtt) rtt_est: " << rtt_est;
|
||||
out << " rtt_dev: " << rtt_dev;
|
||||
out << std::endl;
|
||||
|
||||
out << "(congestion) congestThreshold: " << congestThreshold;
|
||||
out << " congestWinSize: " << congestWinSize;
|
||||
out << " congestUpdate: " << congestUpdate;
|
||||
out << std::endl;
|
||||
|
||||
out << "(TTL) mTTL_period: " << mTTL_period;
|
||||
out << " mTTL_start: " << std::setprecision(12) << mTTL_start;
|
||||
out << " mTTL_end: " << std::setprecision(12) << mTTL_end;
|
||||
out << std::endl;
|
||||
|
||||
out << "(Peer) peerKnown: " << peerKnown;
|
||||
out << " peerAddr: " << peeraddr;
|
||||
out << std::endl;
|
||||
|
||||
out << "-------------------------------------------------------";
|
||||
out << std::endl;
|
||||
status_locked(out);
|
||||
out << "=======================================================";
|
||||
out << std::endl;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
int TcpStream::dumpstate(std::ostream &out)
|
||||
{
|
||||
tcpMtx.lock(); /********** LOCK MUTEX *********/
|
||||
|
||||
dumpstate_locked(out);
|
||||
|
||||
tcpMtx.unlock(); /******** UNLOCK MUTEX *********/
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
int dumpPacket(std::ostream &out, unsigned char *pkt, uint32_t size)
|
||||
{
|
||||
uint32_t i;
|
||||
|
||||
out << "dumpPacket() Size: " << size;
|
||||
out << std::endl;
|
||||
out << "------------------------------------------------------";
|
||||
for(i = 0; i < size; i++)
|
||||
{
|
||||
if (i % 16 == 0)
|
||||
{
|
||||
out << std::endl;
|
||||
}
|
||||
out << std::hex << std::setfill('0') << std::setw(2) << (int) pkt[i] << ":";
|
||||
}
|
||||
if ((i - 1) % 16 != 0)
|
||||
{
|
||||
out << std::endl;
|
||||
}
|
||||
out << "------------------------------------------------------";
|
||||
out << std::dec << std::endl;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
|
||||
@ -49,6 +49,7 @@
|
||||
#define TCP_MAX_WIN 65500
|
||||
#define TCP_ALIVE_TIMEOUT 15 /* 15 sec ... < 20 sec UDP state limit on some firewalls */
|
||||
#define TCP_RETRANS_TIMEOUT 1 /* 1 sec (Initial value) */
|
||||
#define TCP_RETRANS_MAX_TIMEOUT 15 /* 15 secs */
|
||||
#define kNoPktTimeout 60 /* 1 min */
|
||||
|
||||
|
||||
@ -117,6 +118,9 @@ bool ridle(); /* read idle */
|
||||
uint32 wbytes();
|
||||
uint32 rbytes();
|
||||
|
||||
/* Exposed for debugging */
|
||||
int dumpstate(std::ostream &out);
|
||||
|
||||
private:
|
||||
|
||||
/* Internal Functions - use the Mutex (not reentrant) */
|
||||
@ -129,6 +133,9 @@ bool isOldSequence(uint32 tst, uint32 curr);
|
||||
|
||||
/* Internal Functions - only called inside mutex protection */
|
||||
|
||||
int dumpstate_locked(std::ostream &out);
|
||||
int status_locked(std::ostream &out);
|
||||
|
||||
int cleanup();
|
||||
|
||||
/* incoming data */
|
||||
@ -159,6 +166,14 @@ void setRemoteAddress(const struct sockaddr_in &raddr);
|
||||
int getTTL() { return ttl; }
|
||||
void setTTL(int t) { ttl = t; }
|
||||
|
||||
/* retransmission */
|
||||
void startRetransmitTimer();
|
||||
void restartRetransmitTimer();
|
||||
void stopRetransmitTimer();
|
||||
void resetRetransmitTimer();
|
||||
void incRetransmitTimeout();
|
||||
|
||||
|
||||
/* data counting */
|
||||
uint32 int_wbytes();
|
||||
uint32 int_rbytes();
|
||||
@ -195,12 +210,15 @@ uint32 int_rbytes();
|
||||
|
||||
uint32 inAckno; /* next expected */
|
||||
uint32 inWinSize; /* allowing other to send */
|
||||
uint32 rrt;
|
||||
|
||||
/* some (initially) consts */
|
||||
uint32 maxWinSize;
|
||||
uint32 keepAliveTimeout;
|
||||
|
||||
/* retransmit */
|
||||
bool retransTimerOn;
|
||||
double retransTimeout;
|
||||
double retransTimerTs;
|
||||
|
||||
/* some timers */
|
||||
double keepAliveTimer;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user