mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-01 09:46:09 +03:00
96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
// 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.
|
|
|
|
#ifndef NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
|
|
#define NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
|
|
|
|
#include <netinet/in.h>
|
|
// Include here to guarantee this header gets included (for MSG_WAITFORONE)
|
|
// regardless of how the below transitive header include set may change.
|
|
#include <sys/socket.h>
|
|
|
|
#include "base/macros.h"
|
|
#include "net/quic/core/quic_packets.h"
|
|
#include "net/quic/platform/api/quic_clock.h"
|
|
#include "net/quic/platform/api/quic_socket_address.h"
|
|
#include "net/tools/quic/platform/impl/quic_socket_utils.h"
|
|
#include "net/tools/quic/quic_process_packet_interface.h"
|
|
|
|
#define MMSG_MORE 0
|
|
|
|
namespace net {
|
|
|
|
#if MMSG_MORE
|
|
// Read in larger batches to minimize recvmmsg overhead.
|
|
const int kNumPacketsPerReadMmsgCall = 16;
|
|
#endif
|
|
|
|
class QuicPacketReader {
|
|
public:
|
|
QuicPacketReader();
|
|
|
|
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);
|
|
|
|
private:
|
|
// Initialize the internal state of the reader.
|
|
void Initialize();
|
|
|
|
// Reads and dispatches many packets using recvmmsg.
|
|
bool ReadAndDispatchManyPackets(int fd,
|
|
int port,
|
|
const QuicClock& clock,
|
|
ProcessPacketInterface* processor,
|
|
QuicPacketCount* packets_dropped);
|
|
|
|
// Reads and dispatches a single packet using recvmsg.
|
|
static bool ReadAndDispatchSinglePacket(int fd,
|
|
int port,
|
|
const QuicClock& clock,
|
|
ProcessPacketInterface* processor,
|
|
QuicPacketCount* packets_dropped);
|
|
|
|
// Storage only used when recvmmsg is available.
|
|
|
|
#if MMSG_MORE
|
|
// TODO(danzh): change it to be a pointer to avoid the allocation on the stack
|
|
// from exceeding maximum allowed frame size.
|
|
// packets_ and mmsg_hdr_ are used to supply cbuf and buf to the recvmmsg
|
|
// call.
|
|
|
|
struct PacketData {
|
|
iovec iov;
|
|
// raw_address is used for address information provided by the recvmmsg
|
|
// call on the packets.
|
|
struct sockaddr_storage raw_address;
|
|
// cbuf is used for ancillary data from the kernel on recvmmsg.
|
|
char cbuf[QuicSocketUtils::kSpaceForCmsg];
|
|
// buf is used for the data read from the kernel on recvmmsg.
|
|
char buf[kMaxPacketSize];
|
|
};
|
|
PacketData packets_[kNumPacketsPerReadMmsgCall];
|
|
mmsghdr mmsg_hdr_[kNumPacketsPerReadMmsgCall];
|
|
#endif
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(QuicPacketReader);
|
|
};
|
|
|
|
} // namespace net
|
|
|
|
#endif // NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
|