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// Copyright 2015 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.
// A class to read incoming QUIC packets from the UDP socket.
#include "absl/base/optimization.h"
#include "quic/core/quic_clock.h"
#include "quic/core/quic_packets.h"
#include "quic/core/quic_process_packet_interface.h"
#include "quic/core/quic_udp_socket.h"
#include "quic/platform/api/quic_flags.h"
#include "quic/platform/api/quic_socket_address.h"
namespace quic {
// Read in larger batches to minimize recvmmsg overhead.
const int kNumPacketsPerReadMmsgCall = 16;
class QUIC_EXPORT_PRIVATE QuicPacketReader {
QuicPacketReader(const QuicPacketReader&) = delete;
QuicPacketReader& operator=(const QuicPacketReader&) = delete;
virtual ~QuicPacketReader();
// Reads a number of packets from the given fd, and then passes them off to
// the PacketProcessInterface. Returns true if there may be additional
// packets available on the socket.
// Populates |packets_dropped| if it is non-null and the socket is configured
// to track dropped packets and some packets are read.
// If the socket has timestamping enabled, the per packet timestamps will be
// passed to the processor. Otherwise, |clock| will be used.
virtual bool ReadAndDispatchPackets(int fd,
int port,
const QuicClock& clock,
ProcessPacketInterface* processor,
QuicPacketCount* packets_dropped);
// Return the self ip from |packet_info|.
// For dual stack sockets, |packet_info| may contain both a v4 and a v6 ip, in
// that case, |prefer_v6_ip| is used to determine which one is used as the
// return value. If neither v4 nor v6 ip exists, return an uninitialized ip.
static QuicIpAddress GetSelfIpFromPacketInfo(
const QuicUdpPacketInfo& packet_info,
bool prefer_v6_ip);
struct QUIC_EXPORT_PRIVATE ReadBuffer {
control_buffer[kDefaultUdpPacketControlBufferSize]; // For ancillary
// data.
ABSL_CACHELINE_ALIGNED char packet_buffer[kMaxIncomingPacketSize];
QuicUdpSocketApi socket_api_;
std::vector<ReadBuffer> read_buffers_;
QuicUdpSocketApi::ReadPacketResults read_results_;
} // namespace quic