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96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// A class to read incoming QUIC packets from the UDP socket.
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#ifndef NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
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#define NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
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#include <netinet/in.h>
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// Include here to guarantee this header gets included (for MSG_WAITFORONE)
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// regardless of how the below transitive header include set may change.
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#include <sys/socket.h>
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#include "base/macros.h"
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#include "net/quic/core/quic_packets.h"
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#include "net/quic/platform/api/quic_clock.h"
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#include "net/quic/platform/api/quic_socket_address.h"
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#include "net/tools/quic/platform/impl/quic_socket_utils.h"
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#include "net/tools/quic/quic_process_packet_interface.h"
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#define MMSG_MORE 0
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namespace net {
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#if MMSG_MORE
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// Read in larger batches to minimize recvmmsg overhead.
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const int kNumPacketsPerReadMmsgCall = 16;
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#endif
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class QuicPacketReader {
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public:
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QuicPacketReader();
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virtual ~QuicPacketReader();
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// Reads a number of packets from the given fd, and then passes them off to
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// the PacketProcessInterface. Returns true if there may be additional
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// packets available on the socket.
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// Populates |packets_dropped| if it is non-null and the socket is configured
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// to track dropped packets and some packets are read.
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// If the socket has timestamping enabled, the per packet timestamps will be
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// passed to the processor. Otherwise, |clock| will be used.
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virtual bool ReadAndDispatchPackets(int fd,
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int port,
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const QuicClock& clock,
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ProcessPacketInterface* processor,
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QuicPacketCount* packets_dropped);
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private:
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// Initialize the internal state of the reader.
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void Initialize();
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// Reads and dispatches many packets using recvmmsg.
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bool ReadAndDispatchManyPackets(int fd,
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int port,
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const QuicClock& clock,
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ProcessPacketInterface* processor,
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QuicPacketCount* packets_dropped);
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// Reads and dispatches a single packet using recvmsg.
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static bool ReadAndDispatchSinglePacket(int fd,
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int port,
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const QuicClock& clock,
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ProcessPacketInterface* processor,
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QuicPacketCount* packets_dropped);
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// Storage only used when recvmmsg is available.
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#if MMSG_MORE
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// TODO(danzh): change it to be a pointer to avoid the allocation on the stack
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// from exceeding maximum allowed frame size.
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// packets_ and mmsg_hdr_ are used to supply cbuf and buf to the recvmmsg
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// call.
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struct PacketData {
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iovec iov;
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// raw_address is used for address information provided by the recvmmsg
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// call on the packets.
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struct sockaddr_storage raw_address;
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// cbuf is used for ancillary data from the kernel on recvmmsg.
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char cbuf[QuicSocketUtils::kSpaceForCmsg];
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// buf is used for the data read from the kernel on recvmmsg.
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char buf[kMaxPacketSize];
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};
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PacketData packets_[kNumPacketsPerReadMmsgCall];
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mmsghdr mmsg_hdr_[kNumPacketsPerReadMmsgCall];
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#endif
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DISALLOW_COPY_AND_ASSIGN(QuicPacketReader);
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};
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} // namespace net
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#endif // NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
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