1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/quic_chromium_packet_reader.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/single_thread_task_runner.h"
#include "net/base/features.h"
#include "net/base/net_errors.h"
#include "net/quic/address_utils.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_clock.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_types.h"
namespace net {
namespace {
// Add 1 because some of our UDP socket implementations do not read successfully
// when the packet length is equal to the read buffer size.
const size_t kReadBufferSize =
static_cast<size_t>(quic::kMaxIncomingPacketSize + 1);
} // namespace
QuicChromiumPacketReader::QuicChromiumPacketReader(
std::unique_ptr<DatagramClientSocket> socket,
const quic::QuicClock* clock,
Visitor* visitor,
int yield_after_packets,
quic::QuicTime::Delta yield_after_duration,
const NetLogWithSource& net_log)
: socket_(std::move(socket)),
visitor_(visitor),
clock_(clock),
yield_after_packets_(yield_after_packets),
yield_after_duration_(yield_after_duration),
yield_after_(quic::QuicTime::Infinite()),
read_buffer_(base::MakeRefCounted<IOBufferWithSize>(kReadBufferSize)),
net_log_(net_log) {}
QuicChromiumPacketReader::~QuicChromiumPacketReader() = default;
void QuicChromiumPacketReader::StartReading() {
for (;;) {
if (read_pending_)
return;
if (num_packets_read_ == 0)
yield_after_ = clock_->Now() + yield_after_duration_;
CHECK(socket_);
read_pending_ = true;
int rv =
socket_->Read(read_buffer_.get(), read_buffer_->size(),
base::BindOnce(&QuicChromiumPacketReader::OnReadComplete,
weak_factory_.GetWeakPtr()));
UMA_HISTOGRAM_BOOLEAN("Net.QuicSession.AsyncRead", rv == ERR_IO_PENDING);
if (rv == ERR_IO_PENDING) {
num_packets_read_ = 0;
return;
}
if (++num_packets_read_ > yield_after_packets_ ||
clock_->Now() > yield_after_) {
num_packets_read_ = 0;
// Data was read, process it.
// Schedule the work through the message loop to 1) prevent infinite
// recursion and 2) avoid blocking the thread for too long.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&QuicChromiumPacketReader::OnReadComplete,
weak_factory_.GetWeakPtr(), rv));
} else {
if (!ProcessReadResult(rv)) {
return;
}
}
}
}
void QuicChromiumPacketReader::CloseSocket() {
socket_->Close();
}
static_assert(static_cast<EcnCodePoint>(quic::ECN_NOT_ECT) == ECN_NOT_ECT &&
static_cast<EcnCodePoint>(quic::ECN_ECT1) == ECN_ECT1 &&
static_cast<EcnCodePoint>(quic::ECN_ECT0) == ECN_ECT0 &&
static_cast<EcnCodePoint>(quic::ECN_CE) == ECN_CE,
"Mismatch ECN codepoint values");
bool QuicChromiumPacketReader::ProcessReadResult(int result) {
read_pending_ = false;
if (result <= 0 && net_log_.IsCapturing()) {
net_log_.AddEventWithIntParams(NetLogEventType::QUIC_READ_ERROR,
"net_error", result);
}
if (result == 0) {
// 0-length UDP packets are legal but useless, ignore them.
return true;
}
if (result == ERR_MSG_TOO_BIG) {
// This indicates that we received a UDP packet larger than our receive
// buffer, ignore it.
return true;
}
if (result < 0) {
// Report all other errors to the visitor.
return visitor_->OnReadError(result, socket_.get());
}
DscpAndEcn tos = socket_->GetLastTos();
quic::QuicEcnCodepoint ecn = static_cast<quic::QuicEcnCodepoint>(tos.ecn);
quic::QuicReceivedPacket packet(read_buffer_->data(), result, clock_->Now(),
/*owns_buffer=*/false, /*ttl=*/0,
/*ttl_valid=*/true,
/*packet_headers=*/nullptr,
/*headers_length=*/0,
/*owns_header_buffer=*/false, ecn);
IPEndPoint local_address;
IPEndPoint peer_address;
socket_->GetLocalAddress(&local_address);
socket_->GetPeerAddress(&peer_address);
auto self = weak_factory_.GetWeakPtr();
// Notifies the visitor that |this| reader gets a new packet, which may delete
// |this| if |this| is a connectivity probing reader.
return visitor_->OnPacket(packet, ToQuicSocketAddress(local_address),
ToQuicSocketAddress(peer_address)) &&
self;
}
void QuicChromiumPacketReader::OnReadComplete(int result) {
if (ProcessReadResult(result)) {
StartReading();
}
}
} // namespace net
|
