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correct ack ranges calculation

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orignal 2022-06-11 10:15:27 -04:00
parent b918499f14
commit b744a0cc38
2 changed files with 13 additions and 6 deletions
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18
libi2pd/SSU2Session.cpp
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@ -1607,26 +1607,32 @@ namespace transport
}
// ranges
uint32_t lastNum = ackThrough - acnt;
it++;
while (it != m_OutOfSequencePackets.rend () && lastNum > m_ReceivePacketNum && numRanges < 8)
while (it != m_OutOfSequencePackets.rend () && lastNum > m_ReceivePacketNum && numRanges < SSU2_MAX_NUM_ACK_RANGES)
{
if (lastNum - (*it) < 255)
{
buf[7 + numRanges*2] = lastNum - (*it); // NACKs
lastNum = *it;
uint8_t numAcks = 0;
buf[7 + numRanges*2] = lastNum - (*it) - 1; // NACKs
lastNum = *it; it++;
uint8_t numAcks = 1;
while (it != m_OutOfSequencePackets.rend () && numAcks < 255 && lastNum > m_ReceivePacketNum && *it == lastNum - 1)
{
numAcks++; lastNum--;
it++;
}
buf[7 + numRanges*2 + 1] = numAcks; // Acks
numRanges++; it++;
numRanges++;
if (numAcks == 255) break;
}
else
break;
}
if (numRanges < SSU2_MAX_NUM_ACK_RANGES && m_ReceivePacketNum)
{
// add received packets to last range
int numAcks = buf[7 + numRanges*2 + 1] + m_ReceivePacketNum;
if (numAcks > 255) numAcks = 255;
buf[7 + numRanges*2 + 1] = numAcks;
}
}
}
buf[7] = acnt; // acnt

1
libi2pd/SSU2Session.h
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@ -34,6 +34,7 @@ namespace transport
const int SSU2_MAX_NUM_RESENDS = 5;
const int SSU2_INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
const size_t SSU2_MAX_WINDOW_SIZE = 128; // in packets
const int SSU2_MAX_NUM_ACK_RANGES = 32; // to send
enum SSU2MessageType
{