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fix recv cycle buffer crash and avoid send nak packet exceed mtu

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This commit is contained in:
xiongguangjie 2022-06-12 23:35:30 +08:00
parent 6503d95853
commit b771274a7f
4 changed files with 53 additions and 12 deletions
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6
srt/Packet.cpp
View File

@ -515,7 +515,7 @@ bool NAKPacket::loadFromData(uint8_t *buf, size_t len) {
bool NAKPacket::storeToData() {
control_type = NAK;
sub_type = 0;
size_t cif_size = getCIFSize();
size_t cif_size = getCIFSize(lost_list);
_data = BufferRaw::create();
_data->setCapacity(HEADER_SIZE + cif_size);
@ -544,9 +544,9 @@ bool NAKPacket::storeToData() {
return true;
}
size_t NAKPacket::getCIFSize() {
size_t NAKPacket::getCIFSize(std::list<LostPair> &lost) {
size_t size = 0;
for (auto it : lost_list) {
for (auto it : lost) {
if (it.first + 1 == it.second) {
size += 4;
} else {

4
srt/Packet.hpp
View File

@ -275,9 +275,7 @@ public:
bool storeToData() override;
std::list<LostPair> lost_list;
private:
size_t getCIFSize();
static size_t getCIFSize(std::list<LostPair> &lost);
};
/*

17
srt/PacketQueue.cpp
View File

@ -243,6 +243,7 @@ PacketRecvQueue::PacketRecvQueue(uint32_t max_size, uint32_t init_seq, uint32_t
, _pkt_expected_seq(init_seq)
, _pkt_buf(max_size) {}
bool PacketRecvQueue::inputPacket(DataPacket::Ptr pkt, std::list<DataPacket::Ptr> &out) {
// TraceL << dump() << " seq:" << pkt->packet_seq_number;
while (_size > 0 && _start == _end) {
if (_pkt_buf[_start]) {
out.push_back(_pkt_buf[_start]);
@ -385,6 +386,8 @@ std::string PacketRecvQueue::dump() {
<< " first:" << getFirst()->packet_seq_number;
printer << " last:" << getLast()->packet_seq_number;
printer << " latency:" << timeLatency() / 1e3;
printer << " start:" << _start;
printer << " end:" << _end;
}
return std::move(printer);
}
@ -438,8 +441,20 @@ void PacketRecvQueue::insertToCycleBuf(DataPacket::Ptr pkt, uint32_t diff) {
return;
}
_pkt_buf[pos] = pkt;
if (pos >= _end && (_start <= _end || pos < _start)) {
if (_start <= _end && pos >= _end) {
_end = (pos + 1) % _pkt_cap;
return;
}
if (_start <= _end && pos < _start) {
_end = (pos + 1) % _pkt_cap;
return;
}
if (_start > _end && _end <= pos && _start > pos) {
_end = (pos + 1) % _pkt_cap;
return;
}
}
void PacketRecvQueue::tryInsertPkt(DataPacket::Ptr pkt) {

32
srt/SrtTransport.cpp
View File

@ -1,4 +1,5 @@
#include "Util/onceToken.h"
#include <iterator>
#include <stdlib.h>
#include "Ack.hpp"
@ -435,15 +436,42 @@ void SrtTransport::sendLightACKPacket() {
void SrtTransport::sendNAKPacket(std::list<PacketQueue::LostPair> &lost_list) {
NAKPacket::Ptr pkt = std::make_shared<NAKPacket>();
std::list<PacketQueue::LostPair> tmp;
auto size = NAKPacket::getCIFSize(lost_list);
size_t paylaod_size = getPayloadSize();
if (size > paylaod_size) {
WarnL << "loss report cif size " << size;
size_t num = paylaod_size / 8;
size_t msgNum = (lost_list.size() + num - 1) / num;
decltype(lost_list.begin()) cur, next;
for (size_t i = 0; i < msgNum; ++i) {
cur = lost_list.begin();
std::advance(cur, i * num);
if (i == msgNum - 1) {
next = lost_list.end();
} else {
next = lost_list.begin();
std::advance(next, (i + 1) * num);
}
tmp.assign(cur, next);
pkt->dst_socket_id = _peer_socket_id;
pkt->timestamp = DurationCountMicroseconds(_now - _start_timestamp);
pkt->lost_list = tmp;
pkt->storeToData();
sendControlPacket(pkt, true);
}
} else {
pkt->dst_socket_id = _peer_socket_id;
pkt->timestamp = DurationCountMicroseconds(_now - _start_timestamp);
pkt->lost_list = lost_list;
pkt->storeToData();
sendControlPacket(pkt, true);
}
// TraceL<<"send NAK "<<pkt->dump();
sendControlPacket(pkt, true);
}
void SrtTransport::sendShutDown() {