content/browser/renderer_host/p2p/socket_host_udp.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/renderer_host/p2p/socket_host_udp.h"
   6
   7 #include "base/bind.h"
   8 #include "base/debug/trace_event.h"
   9 #include "base/stl_util.h"
  10 #include "content/browser/renderer_host/p2p/socket_host_throttler.h"
  11 #include "content/common/p2p_messages.h"
  12 #include "content/public/browser/content_browser_client.h"
  13 #include "content/public/common/content_client.h"
  14 #include "ipc/ipc_sender.h"
  15 #include "net/base/io_buffer.h"
  16 #include "net/base/net_errors.h"
  17 #include "net/base/net_util.h"
  18 #include "third_party/libjingle/source/talk/base/asyncpacketsocket.h"
  19
  20 namespace {
  21
  22 // UDP packets cannot be bigger than 64k.
  23 const int kReadBufferSize = 65536;
  24 // Socket receive buffer size.
  25 const int kRecvSocketBufferSize = 65536;  // 64K
  26
  27 // Defines set of transient errors. These errors are ignored when we get them
  28 // from sendto() or recvfrom() calls.
  29 //
  30 // net::ERR_OUT_OF_MEMORY
  31 //
  32 // This is caused by ENOBUFS which means the buffer of the network interface
  33 // is full.
  34 //
  35 // net::ERR_CONNECTION_RESET
  36 //
  37 // This is caused by WSAENETRESET or WSAECONNRESET which means the
  38 // last send resulted in an "ICMP Port Unreachable" message.
  39 bool IsTransientError(int error) {
  40   return error == net::ERR_ADDRESS_UNREACHABLE ||
  41          error == net::ERR_ADDRESS_INVALID ||
  42          error == net::ERR_ACCESS_DENIED ||
  43          error == net::ERR_CONNECTION_RESET ||
  44          error == net::ERR_OUT_OF_MEMORY ||
  45          error == net::ERR_INTERNET_DISCONNECTED;
  46 }
  47
  48 }  // namespace
  49
  50 namespace content {
  51
  52 P2PSocketHostUdp::PendingPacket::PendingPacket(
  53     const net::IPEndPoint& to,
  54     const std::vector<char>& content,
  55     const talk_base::PacketOptions& options,
  56     uint64 id)
  57     : to(to),
  58       data(new net::IOBuffer(content.size())),
  59       size(content.size()),
  60       packet_options(options),
  61       id(id) {
  62   memcpy(data->data(), &content[0], size);
  63 }
  64
  65 P2PSocketHostUdp::PendingPacket::~PendingPacket() {
  66 }
  67
  68 P2PSocketHostUdp::P2PSocketHostUdp(IPC::Sender* message_sender,
  69                                    int id,
  70                                    P2PMessageThrottler* throttler)
  71     : P2PSocketHost(message_sender, id),
  72       socket_(new net::UDPServerSocket(
  73           GetContentClient()->browser()->GetNetLog(),
  74           net::NetLog::Source())),
  75       send_pending_(false),
  76       last_dscp_(net::DSCP_CS0),
  77       throttler_(throttler) {
  78 }
  79
  80 P2PSocketHostUdp::~P2PSocketHostUdp() {
  81   if (state_ == STATE_OPEN) {
  82     DCHECK(socket_.get());
  83     socket_.reset();
  84   }
  85 }
  86
  87 bool P2PSocketHostUdp::Init(const net::IPEndPoint& local_address,
  88                             const P2PHostAndIPEndPoint& remote_address) {
  89   DCHECK_EQ(state_, STATE_UNINITIALIZED);
  90
  91   int result = socket_->Listen(local_address);
  92   if (result < 0) {
  93     LOG(ERROR) << "bind() failed: " << result;
  94     OnError();
  95     return false;
  96   }
  97
  98   // Setting recv socket buffer size.
  99   if (socket_->SetReceiveBufferSize(kRecvSocketBufferSize) != net::OK) {
 100     LOG(WARNING) << "Failed to set socket receive buffer size to "
 101                  << kRecvSocketBufferSize;
 102   }
 103
 104   net::IPEndPoint address;
 105   result = socket_->GetLocalAddress(&address);
 106   if (result < 0) {
 107     LOG(ERROR) << "P2PSocketHostUdp::Init(): unable to get local address: "
 108                << result;
 109     OnError();
 110     return false;
 111   }
 112   VLOG(1) << "Local address: " << address.ToString();
 113
 114   state_ = STATE_OPEN;
 115
 116   message_sender_->Send(new P2PMsg_OnSocketCreated(id_, address));
 117
 118   recv_buffer_ = new net::IOBuffer(kReadBufferSize);
 119   DoRead();
 120
 121   return true;
 122 }
 123
 124 void P2PSocketHostUdp::OnError() {
 125   socket_.reset();
 126   send_queue_.clear();
 127
 128   if (state_ == STATE_UNINITIALIZED || state_ == STATE_OPEN)
 129     message_sender_->Send(new P2PMsg_OnError(id_));
 130
 131   state_ = STATE_ERROR;
 132 }
 133
 134 void P2PSocketHostUdp::DoRead() {
 135   int result;
 136   do {
 137     result = socket_->RecvFrom(
 138         recv_buffer_.get(),
 139         kReadBufferSize,
 140         &recv_address_,
 141         base::Bind(&P2PSocketHostUdp::OnRecv, base::Unretained(this)));
 142     if (result == net::ERR_IO_PENDING)
 143       return;
 144     HandleReadResult(result);
 145   } while (state_ == STATE_OPEN);
 146 }
 147
 148 void P2PSocketHostUdp::OnRecv(int result) {
 149   HandleReadResult(result);
 150   if (state_ == STATE_OPEN) {
 151     DoRead();
 152   }
 153 }
 154
 155 void P2PSocketHostUdp::HandleReadResult(int result) {
 156   DCHECK_EQ(STATE_OPEN, state_);
 157
 158   if (result > 0) {
 159     std::vector<char> data(recv_buffer_->data(), recv_buffer_->data() + result);
 160
 161     if (!ContainsKey(connected_peers_, recv_address_)) {
 162       P2PSocketHost::StunMessageType type;
 163       bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 164       if ((stun && IsRequestOrResponse(type))) {
 165         connected_peers_.insert(recv_address_);
 166       } else if (!stun || type == STUN_DATA_INDICATION) {
 167         LOG(ERROR) << "Received unexpected data packet from "
 168                    << recv_address_.ToString()
 169                    << " before STUN binding is finished.";
 170         return;
 171       }
 172     }
 173
 174     message_sender_->Send(new P2PMsg_OnDataReceived(
 175         id_, recv_address_, data, base::TimeTicks::Now()));
 176   } else if (result < 0 && !IsTransientError(result)) {
 177     LOG(ERROR) << "Error when reading from UDP socket: " << result;
 178     OnError();
 179   }
 180 }
 181
 182 void P2PSocketHostUdp::Send(const net::IPEndPoint& to,
 183                             const std::vector<char>& data,
 184                             const talk_base::PacketOptions& options,
 185                             uint64 packet_id) {
 186   if (!socket_) {
 187     // The Send message may be sent after the an OnError message was
 188     // sent by hasn't been processed the renderer.
 189     return;
 190   }
 191
 192   if (!ContainsKey(connected_peers_, to)) {
 193     P2PSocketHost::StunMessageType type = P2PSocketHost::StunMessageType();
 194     bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 195     if (!stun || type == STUN_DATA_INDICATION) {
 196       LOG(ERROR) << "Page tried to send a data packet to " << to.ToString()
 197                  << " before STUN binding is finished.";
 198       OnError();
 199       return;
 200     }
 201
 202     if (throttler_->DropNextPacket(data.size())) {
 203       VLOG(0) << "STUN message is dropped due to high volume.";
 204       // Do not reset socket.
 205       return;
 206     }
 207   }
 208
 209   if (send_pending_) {
 210     send_queue_.push_back(PendingPacket(to, data, options, packet_id));
 211   } else {
 212     // TODO(mallinath: Remove unnecessary memcpy in this case.
 213     PendingPacket packet(to, data, options, packet_id);
 214     DoSend(packet);
 215   }
 216 }
 217
 218 void P2PSocketHostUdp::DoSend(const PendingPacket& packet) {
 219   TRACE_EVENT_ASYNC_STEP_INTO1("p2p", "Send", packet.id, "UdpAsyncSendTo",
 220                                "size", packet.size);
 221   // Don't try to set DSCP in following conditions,
 222   // 1. If the outgoing packet is set to DSCP_NO_CHANGE
 223   // 2. If no change in DSCP value from last packet
 224   // 3. If there is any error in setting DSCP on socket.
 225   net::DiffServCodePoint dscp =
 226       static_cast<net::DiffServCodePoint>(packet.packet_options.dscp);
 227   if (dscp != net::DSCP_NO_CHANGE && last_dscp_ != dscp &&
 228       last_dscp_ != net::DSCP_NO_CHANGE) {
 229     int result = socket_->SetDiffServCodePoint(dscp);
 230     if (result == net::OK) {
 231       last_dscp_ = dscp;
 232     } else if (!IsTransientError(result) && last_dscp_ != net::DSCP_CS0) {
 233       // We receieved a non-transient error, and it seems we have
 234       // not changed the DSCP in the past, disable DSCP as it unlikely
 235       // to work in the future.
 236       last_dscp_ = net::DSCP_NO_CHANGE;
 237     }
 238   }
 239   packet_processing_helpers::ApplyPacketOptions(
 240       packet.data->data(), packet.size, packet.packet_options, 0);
 241   int result = socket_->SendTo(
 242       packet.data.get(),
 243       packet.size,
 244       packet.to,
 245       base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this), packet.id));
 246
 247   // sendto() may return an error, e.g. if we've received an ICMP Destination
 248   // Unreachable message. When this happens try sending the same packet again,
 249   // and just drop it if it fails again.
 250   if (IsTransientError(result)) {
 251     result = socket_->SendTo(
 252         packet.data.get(),
 253         packet.size,
 254         packet.to,
 255         base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this),
 256                    packet.id));
 257   }
 258
 259   if (result == net::ERR_IO_PENDING) {
 260     send_pending_ = true;
 261   } else {
 262     HandleSendResult(packet.id, result);
 263   }
 264 }
 265
 266 void P2PSocketHostUdp::OnSend(uint64 packet_id, int result) {
 267   DCHECK(send_pending_);
 268   DCHECK_NE(result, net::ERR_IO_PENDING);
 269
 270   send_pending_ = false;
 271
 272   HandleSendResult(packet_id, result);
 273
 274   // Send next packets if we have them waiting in the buffer.
 275   while (state_ == STATE_OPEN && !send_queue_.empty() && !send_pending_) {
 276     DoSend(send_queue_.front());
 277     send_queue_.pop_front();
 278   }
 279 }
 280
 281 void P2PSocketHostUdp::HandleSendResult(uint64 packet_id, int result) {
 282   TRACE_EVENT_ASYNC_END1("p2p", "Send", packet_id,
 283                          "result", result);
 284   if (result < 0) {
 285     if (!IsTransientError(result)) {
 286       LOG(ERROR) << "Error when sending data in UDP socket: " << result;
 287       OnError();
 288       return;
 289     }
 290     VLOG(0) << "sendto() has failed twice returning a "
 291                " transient error. Dropping the packet.";
 292   }
 293   message_sender_->Send(new P2PMsg_OnSendComplete(id_));
 294 }
 295
 296 P2PSocketHost* P2PSocketHostUdp::AcceptIncomingTcpConnection(
 297     const net::IPEndPoint& remote_address, int id) {
 298   NOTREACHED();
 299   OnError();
 300   return NULL;
 301 }
 302
 303 bool P2PSocketHostUdp::SetOption(P2PSocketOption option, int value) {
 304   DCHECK_EQ(STATE_OPEN, state_);
 305   switch (option) {
 306     case P2P_SOCKET_OPT_RCVBUF:
 307       return socket_->SetReceiveBufferSize(value) == net::OK;
 308     case P2P_SOCKET_OPT_SNDBUF:
 309       return socket_->SetSendBufferSize(value) == net::OK;
 310     case P2P_SOCKET_OPT_DSCP:
 311       return (net::OK == socket_->SetDiffServCodePoint(
 312           static_cast<net::DiffServCodePoint>(value))) ? true : false;
 313     default:
 314       NOTREACHED();
 315       return false;
 316   }
 317 }
 318
 319 }  // namespace content