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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.
#ifndef NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
#define NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
#include <netinet/in.h>
#include <sys/socket.h>
#include "base/macros.h"
#include "net/quic/quic_protocol.h"
namespace net {
namespace tools {
// Read in larger batches to minimize recvmmsg overhead.
const int kNumPacketsPerReadMmsgCall = 16;
// Allocate space for in6_pktinfo as it's larger than in_pktinfo
const int kSpaceForOverflowAndIp =
CMSG_SPACE(sizeof(int)) + CMSG_SPACE(sizeof(in6_pktinfo));
namespace test {
class QuicServerPeer;
} // namespace test
class ProcessPacketInterface;
class QuicDispatcher;
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.
virtual bool ReadAndDispatchPackets(int fd,
int port,
ProcessPacketInterface* processor,
QuicPacketCount* packets_dropped);
// Same as ReadAndDispatchPackets, only does one packet at a time.
static bool ReadAndDispatchSinglePacket(int fd,
int port,
ProcessPacketInterface* processor,
QuicPacketCount* packets_dropped);
private:
// Initialize the internal state of the reader.
void Initialize();
// Storage only used when recvmmsg is available.
// cbuf_ is used for ancillary data from the kernel on recvmmsg.
char cbuf_[kSpaceForOverflowAndIp * kNumPacketsPerReadMmsgCall];
// buf_ is used for the data read from the kernel on recvmmsg.
// TODO(danzh): change it to be a pointer to avoid the allocation on the stack
// from exceeding maximum allowed frame size.
char buf_[kMaxPacketSize * kNumPacketsPerReadMmsgCall];
// iov_ and mmsg_hdr_ are used to supply cbuf and buf to the recvmmsg call.
iovec iov_[kNumPacketsPerReadMmsgCall];
mmsghdr mmsg_hdr_[kNumPacketsPerReadMmsgCall];
// raw_address_ is used for address information provided by the recvmmsg
// call on the packets.
struct sockaddr_storage raw_address_[kNumPacketsPerReadMmsgCall];
DISALLOW_COPY_AND_ASSIGN(QuicPacketReader);
};
} // namespace tools
} // namespace net
#endif // NET_TOOLS_QUIC_QUIC_PACKET_READER_H_
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