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// Copyright (c) 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "quic/core/frames/quic_ack_frame.h"
#include "quic/core/quic_constants.h"
#include "quic/core/quic_interval.h"
#include "quic/platform/api/quic_bug_tracker.h"
#include "quic/platform/api/quic_flag_utils.h"
namespace quic {
namespace {
const QuicPacketCount kMaxPrintRange = 128;
} // namespace
bool IsAwaitingPacket(const QuicAckFrame& ack_frame,
QuicPacketNumber packet_number,
QuicPacketNumber peer_least_packet_awaiting_ack) {
QUICHE_DCHECK(packet_number.IsInitialized());
return (!peer_least_packet_awaiting_ack.IsInitialized() ||
packet_number >= peer_least_packet_awaiting_ack) &&
!ack_frame.packets.Contains(packet_number);
}
QuicAckFrame::QuicAckFrame() = default;
QuicAckFrame::QuicAckFrame(const QuicAckFrame& other) = default;
QuicAckFrame::~QuicAckFrame() {}
std::ostream& operator<<(std::ostream& os, const QuicAckFrame& ack_frame) {
os << "{ largest_acked: " << LargestAcked(ack_frame)
<< ", ack_delay_time: " << ack_frame.ack_delay_time.ToMicroseconds()
<< ", packets: [ " << ack_frame.packets << " ]"
<< ", received_packets: [ ";
for (const std::pair<QuicPacketNumber, QuicTime>& p :
ack_frame.received_packet_times) {
os << p.first << " at " << p.second.ToDebuggingValue() << " ";
}
os << " ]";
os << ", ecn_counters_populated: " << ack_frame.ecn_counters_populated;
if (ack_frame.ecn_counters_populated) {
os << ", ect_0_count: " << ack_frame.ect_0_count
<< ", ect_1_count: " << ack_frame.ect_1_count
<< ", ecn_ce_count: " << ack_frame.ecn_ce_count;
}
os << " }\n";
return os;
}
void QuicAckFrame::Clear() {
largest_acked.Clear();
ack_delay_time = QuicTime::Delta::Infinite();
received_packet_times.clear();
packets.Clear();
}
PacketNumberQueue::PacketNumberQueue() {}
PacketNumberQueue::PacketNumberQueue(const PacketNumberQueue& other) = default;
PacketNumberQueue::PacketNumberQueue(PacketNumberQueue&& other) = default;
PacketNumberQueue::~PacketNumberQueue() {}
PacketNumberQueue& PacketNumberQueue::operator=(
const PacketNumberQueue& other) = default;
PacketNumberQueue& PacketNumberQueue::operator=(PacketNumberQueue&& other) =
default;
void PacketNumberQueue::Add(QuicPacketNumber packet_number) {
if (!packet_number.IsInitialized()) {
return;
}
packet_number_intervals_.AddOptimizedForAppend(packet_number,
packet_number + 1);
}
void PacketNumberQueue::AddRange(QuicPacketNumber lower,
QuicPacketNumber higher) {
if (!lower.IsInitialized() || !higher.IsInitialized() || lower >= higher) {
return;
}
packet_number_intervals_.AddOptimizedForAppend(lower, higher);
}
bool PacketNumberQueue::RemoveUpTo(QuicPacketNumber higher) {
if (!higher.IsInitialized() || Empty()) {
return false;
}
return packet_number_intervals_.TrimLessThan(higher);
}
void PacketNumberQueue::RemoveSmallestInterval() {
// TODO(wub): Move this QUIC_BUG to upper level.
QUIC_BUG_IF(packet_number_intervals_.Size() < 2)
<< (Empty() ? "No intervals to remove."
: "Can't remove the last interval.");
packet_number_intervals_.PopFront();
}
void PacketNumberQueue::Clear() {
packet_number_intervals_.Clear();
}
bool PacketNumberQueue::Contains(QuicPacketNumber packet_number) const {
if (!packet_number.IsInitialized()) {
return false;
}
return packet_number_intervals_.Contains(packet_number);
}
bool PacketNumberQueue::Empty() const {
return packet_number_intervals_.Empty();
}
QuicPacketNumber PacketNumberQueue::Min() const {
QUICHE_DCHECK(!Empty());
return packet_number_intervals_.begin()->min();
}
QuicPacketNumber PacketNumberQueue::Max() const {
QUICHE_DCHECK(!Empty());
return packet_number_intervals_.rbegin()->max() - 1;
}
QuicPacketCount PacketNumberQueue::NumPacketsSlow() const {
QuicPacketCount n_packets = 0;
for (const auto& interval : packet_number_intervals_) {
n_packets += interval.Length();
}
return n_packets;
}
size_t PacketNumberQueue::NumIntervals() const {
return packet_number_intervals_.Size();
}
PacketNumberQueue::const_iterator PacketNumberQueue::begin() const {
return packet_number_intervals_.begin();
}
PacketNumberQueue::const_iterator PacketNumberQueue::end() const {
return packet_number_intervals_.end();
}
PacketNumberQueue::const_reverse_iterator PacketNumberQueue::rbegin() const {
return packet_number_intervals_.rbegin();
}
PacketNumberQueue::const_reverse_iterator PacketNumberQueue::rend() const {
return packet_number_intervals_.rend();
}
QuicPacketCount PacketNumberQueue::LastIntervalLength() const {
QUICHE_DCHECK(!Empty());
return packet_number_intervals_.rbegin()->Length();
}
// Largest min...max range for packet numbers where we print the numbers
// explicitly. If bigger than this, we print as a range [a,d] rather
// than [a b c d]
std::ostream& operator<<(std::ostream& os, const PacketNumberQueue& q) {
for (const QuicInterval<QuicPacketNumber>& interval : q) {
// Print as a range if there is a pathological condition.
if ((interval.min() >= interval.max()) ||
(interval.max() - interval.min() > kMaxPrintRange)) {
// If min>max, it's really a bug, so QUIC_BUG it to
// catch it in development.
QUIC_BUG_IF(interval.min() >= interval.max())
<< "Ack Range minimum (" << interval.min() << "Not less than max ("
<< interval.max() << ")";
// print range as min...max rather than full list.
// in the event of a bug, the list could be very big.
os << interval.min() << "..." << (interval.max() - 1) << " ";
} else {
for (QuicPacketNumber packet_number = interval.min();
packet_number < interval.max(); ++packet_number) {
os << packet_number << " ";
}
}
}
return os;
}
} // namespace quic