Move quic_socket_utils to platform/impl/

net/tools/quic/quic_socket_utils.h

-// Copyright (c) 2012 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.
-//
-// Some socket related helper methods for quic.
-
-#ifndef NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_
-#define NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_
-
-#include <netinet/in.h>
-#include <stddef.h>
-#include <sys/socket.h>
-
-#include <string>
-
-#include "base/macros.h"
-#include "net/base/ip_address.h"
-#include "net/base/ip_endpoint.h"
-#include "net/quic/core/quic_bandwidth.h"
-#include "net/quic/core/quic_types.h"
-
-namespace net {
-class QuicIpAddress;
-class QuicSocketAddress;
-
-// This is the structure that SO_TIMESTAMPING fills into the cmsg header. It is
-// well-defined, but does not have a definition in a public header. See
-// https://www.kernel.org/doc/Documentation/networking/timestamping.txt for more
-// information.
-struct LinuxTimestamping {
-  // The converted system time of the timestamp.
-  struct timespec systime;
-  // Deprecated; serves only as padding.
-  struct timespec hwtimetrans;
-  // The raw hardware timestamp.
-  struct timespec hwtimeraw;
-};
-
-class QuicSocketUtils {
- public:
-  // The first integer is for overflow. The in6_pktinfo is the larger of the
-  // address structures present. LinuxTimestamping is present for socket
-  // timestamping.  The subsequent int is for ttl.
-  // The final int is a sentinel so the msg_controllen feedback
-  // can be used to detect larger control messages than there is space for.
-  static const int kSpaceForCmsg =
-      CMSG_SPACE(CMSG_LEN(sizeof(int)) + CMSG_LEN(sizeof(in6_pktinfo)) +
-                 CMSG_LEN(sizeof(LinuxTimestamping)) +
-                 CMSG_LEN(sizeof(int)) +
-                 CMSG_LEN(sizeof(int)));
-
-  // Fills in |address| if |hdr| contains IP_PKTINFO or IPV6_PKTINFO. Fills in
-  // |timestamp| if |hdr| contains |SO_TIMESTAMPING|. |address| and |timestamp|
-  // must not be null.
-  static void GetAddressAndTimestampFromMsghdr(struct msghdr* hdr,
-                                               QuicIpAddress* address,
-                                               QuicWallTime* walltimestamp);
-
-  // If the msghdr contains an SO_RXQ_OVFL entry, this will set dropped_packets
-  // to the correct value and return true. Otherwise it will return false.
-  static bool GetOverflowFromMsghdr(struct msghdr* hdr,
-                                    QuicPacketCount* dropped_packets);
-
-  // If the msghdr contains an IP_TTL entry, this will set ttl to the correct
-  // value and return true. Otherwise it will return false.
-  static bool GetTtlFromMsghdr(struct msghdr* hdr, int* ttl);
-
-  // Sets either IP_PKTINFO or IPV6_PKTINFO on the socket, based on
-  // address_family.  Returns the return code from setsockopt.
-  static int SetGetAddressInfo(int fd, int address_family);
-
-  // Sets SO_TIMESTAMPING on the socket for software receive timestamping.
-  // Returns the return code from setsockopt.
-  static int SetGetSoftwareReceiveTimestamp(int fd);
-
-  // Sets the send buffer size to |size| and returns false if it fails.
-  static bool SetSendBufferSize(int fd, size_t size);
-
-  // Sets the receive buffer size to |size| and returns false if it fails.
-  static bool SetReceiveBufferSize(int fd, size_t size);
-
-  // Reads buf_len from the socket.  If reading is successful, returns bytes
-  // read and sets peer_address to the peer address.  Otherwise returns -1.
-  //
-  // If dropped_packets is non-null, it will be set to the number of packets
-  // dropped on the socket since the socket was created, assuming the kernel
-  // supports this feature.
-  //
-  // If self_address is non-null, it will be set to the address the peer sent
-  // packets to, assuming a packet was read.
-  //
-  // If timestamp is non-null, it will be filled with the timestamp of the
-  // received packet, assuming a packet was read and the platform supports
-  // packet receipt timestamping. If the platform does not support packet
-  // receipt timestamping, timestamp will not be changed.
-  static int ReadPacket(int fd,
-                        char* buffer,
-                        size_t buf_len,
-                        QuicPacketCount* dropped_packets,
-                        QuicIpAddress* self_address,
-                        QuicWallTime* walltimestamp,
-                        QuicSocketAddress* peer_address);
-
-  // Writes buf_len to the socket. If writing is successful, sets the result's
-  // status to WRITE_STATUS_OK and sets bytes_written.  Otherwise sets the
-  // result's status to WRITE_STATUS_BLOCKED or WRITE_STATUS_ERROR and sets
-  // error_code to errno.
-  static WriteResult WritePacket(int fd,
-                                 const char* buffer,
-                                 size_t buf_len,
-                                 const QuicIpAddress& self_address,
-                                 const QuicSocketAddress& peer_address);
-
-  // A helper for WritePacket which fills in the cmsg with the supplied self
-  // address.
-  // Returns the length of the packet info structure used.
-  static size_t SetIpInfoInCmsg(const QuicIpAddress& self_address,
-                                cmsghdr* cmsg);
-
-  // Creates a UDP socket and sets appropriate socket options for QUIC.
-  // Returns the created FD if successful, -1 otherwise.
-  // |overflow_supported| is set to true if the socket supports it.
-  static int CreateUDPSocket(const QuicSocketAddress& address,
-                             bool* overflow_supported);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(QuicSocketUtils);
-};
-
-}  // namespace net
-
-#endif  // NET_TOOLS_QUIC_QUIC_SOCKET_UTILS_H_