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/webrtc/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 rtc::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 socket_id,
  70                                    P2PMessageThrottler* throttler)
  71     : P2PSocketHost(message_sender, socket_id),
  72       socket_(
  73           new net::UDPServerSocket(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   // NOTE: Remote address will be same as what renderer provided.
 117   message_sender_->Send(new P2PMsg_OnSocketCreated(
 118       id_, address, remote_address.ip_address));
 119
 120   recv_buffer_ = new net::IOBuffer(kReadBufferSize);
 121   DoRead();
 122
 123   return true;
 124 }
 125
 126 void P2PSocketHostUdp::OnError() {
 127   socket_.reset();
 128   send_queue_.clear();
 129
 130   if (state_ == STATE_UNINITIALIZED || state_ == STATE_OPEN)
 131     message_sender_->Send(new P2PMsg_OnError(id_));
 132
 133   state_ = STATE_ERROR;
 134 }
 135
 136 void P2PSocketHostUdp::DoRead() {
 137   int result;
 138   do {
 139     result = socket_->RecvFrom(
 140         recv_buffer_.get(),
 141         kReadBufferSize,
 142         &recv_address_,
 143         base::Bind(&P2PSocketHostUdp::OnRecv, base::Unretained(this)));
 144     if (result == net::ERR_IO_PENDING)
 145       return;
 146     HandleReadResult(result);
 147   } while (state_ == STATE_OPEN);
 148 }
 149
 150 void P2PSocketHostUdp::OnRecv(int result) {
 151   HandleReadResult(result);
 152   if (state_ == STATE_OPEN) {
 153     DoRead();
 154   }
 155 }
 156
 157 void P2PSocketHostUdp::HandleReadResult(int result) {
 158   DCHECK_EQ(STATE_OPEN, state_);
 159
 160   if (result > 0) {
 161     std::vector<char> data(recv_buffer_->data(), recv_buffer_->data() + result);
 162
 163     if (!ContainsKey(connected_peers_, recv_address_)) {
 164       P2PSocketHost::StunMessageType type;
 165       bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 166       if ((stun && IsRequestOrResponse(type))) {
 167         connected_peers_.insert(recv_address_);
 168       } else if (!stun || type == STUN_DATA_INDICATION) {
 169         LOG(ERROR) << "Received unexpected data packet from "
 170                    << recv_address_.ToString()
 171                    << " before STUN binding is finished.";
 172         return;
 173       }
 174     }
 175
 176     message_sender_->Send(new P2PMsg_OnDataReceived(
 177         id_, recv_address_, data, base::TimeTicks::Now()));
 178
 179     if (dump_incoming_rtp_packet_)
 180       DumpRtpPacket(&data[0], data.size(), true);
 181   } else if (result < 0 && !IsTransientError(result)) {
 182     LOG(ERROR) << "Error when reading from UDP socket: " << result;
 183     OnError();
 184   }
 185 }
 186
 187 void P2PSocketHostUdp::Send(const net::IPEndPoint& to,
 188                             const std::vector<char>& data,
 189                             const rtc::PacketOptions& options,
 190                             uint64 packet_id) {
 191   if (!socket_) {
 192     // The Send message may be sent after the an OnError message was
 193     // sent by hasn't been processed the renderer.
 194     return;
 195   }
 196
 197   if (!ContainsKey(connected_peers_, to)) {
 198     P2PSocketHost::StunMessageType type = P2PSocketHost::StunMessageType();
 199     bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
 200     if (!stun || type == STUN_DATA_INDICATION) {
 201       LOG(ERROR) << "Page tried to send a data packet to " << to.ToString()
 202                  << " before STUN binding is finished.";
 203       OnError();
 204       return;
 205     }
 206
 207     if (throttler_->DropNextPacket(data.size())) {
 208       VLOG(0) << "STUN message is dropped due to high volume.";
 209       // Do not reset socket.
 210       return;
 211     }
 212   }
 213
 214   if (send_pending_) {
 215     send_queue_.push_back(PendingPacket(to, data, options, packet_id));
 216   } else {
 217     // TODO(mallinath: Remove unnecessary memcpy in this case.
 218     PendingPacket packet(to, data, options, packet_id);
 219     DoSend(packet);
 220   }
 221 }
 222
 223 void P2PSocketHostUdp::DoSend(const PendingPacket& packet) {
 224   TRACE_EVENT_ASYNC_STEP_INTO1("p2p", "Send", packet.id, "UdpAsyncSendTo",
 225                                "size", packet.size);
 226   // Don't try to set DSCP in following conditions,
 227   // 1. If the outgoing packet is set to DSCP_NO_CHANGE
 228   // 2. If no change in DSCP value from last packet
 229   // 3. If there is any error in setting DSCP on socket.
 230   net::DiffServCodePoint dscp =
 231       static_cast<net::DiffServCodePoint>(packet.packet_options.dscp);
 232   if (dscp != net::DSCP_NO_CHANGE && last_dscp_ != dscp &&
 233       last_dscp_ != net::DSCP_NO_CHANGE) {
 234     int result = socket_->SetDiffServCodePoint(dscp);
 235     if (result == net::OK) {
 236       last_dscp_ = dscp;
 237     } else if (!IsTransientError(result) && last_dscp_ != net::DSCP_CS0) {
 238       // We receieved a non-transient error, and it seems we have
 239       // not changed the DSCP in the past, disable DSCP as it unlikely
 240       // to work in the future.
 241       last_dscp_ = net::DSCP_NO_CHANGE;
 242     }
 243   }
 244   packet_processing_helpers::ApplyPacketOptions(
 245       packet.data->data(), packet.size, packet.packet_options, 0);
 246   int result = socket_->SendTo(
 247       packet.data.get(),
 248       packet.size,
 249       packet.to,
 250       base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this), packet.id));
 251
 252   // sendto() may return an error, e.g. if we've received an ICMP Destination
 253   // Unreachable message. When this happens try sending the same packet again,
 254   // and just drop it if it fails again.
 255   if (IsTransientError(result)) {
 256     result = socket_->SendTo(
 257         packet.data.get(),
 258         packet.size,
 259         packet.to,
 260         base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this),
 261                    packet.id));
 262   }
 263
 264   if (result == net::ERR_IO_PENDING) {
 265     send_pending_ = true;
 266   } else {
 267     HandleSendResult(packet.id, result);
 268   }
 269
 270   if (dump_outgoing_rtp_packet_)
 271     DumpRtpPacket(packet.data->data(), packet.size, false);
 272 }
 273
 274 void P2PSocketHostUdp::OnSend(uint64 packet_id, int result) {
 275   DCHECK(send_pending_);
 276   DCHECK_NE(result, net::ERR_IO_PENDING);
 277
 278   send_pending_ = false;
 279
 280   HandleSendResult(packet_id, result);
 281
 282   // Send next packets if we have them waiting in the buffer.
 283   while (state_ == STATE_OPEN && !send_queue_.empty() && !send_pending_) {
 284     DoSend(send_queue_.front());
 285     send_queue_.pop_front();
 286   }
 287 }
 288
 289 void P2PSocketHostUdp::HandleSendResult(uint64 packet_id, int result) {
 290   TRACE_EVENT_ASYNC_END1("p2p", "Send", packet_id,
 291                          "result", result);
 292   if (result < 0) {
 293     if (!IsTransientError(result)) {
 294       LOG(ERROR) << "Error when sending data in UDP socket: " << result;
 295       OnError();
 296       return;
 297     }
 298     VLOG(0) << "sendto() has failed twice returning a "
 299                " transient error. Dropping the packet.";
 300   }
 301   message_sender_->Send(new P2PMsg_OnSendComplete(id_));
 302 }
 303
 304 P2PSocketHost* P2PSocketHostUdp::AcceptIncomingTcpConnection(
 305     const net::IPEndPoint& remote_address, int id) {
 306   NOTREACHED();
 307   OnError();
 308   return NULL;
 309 }
 310
 311 bool P2PSocketHostUdp::SetOption(P2PSocketOption option, int value) {
 312   DCHECK_EQ(STATE_OPEN, state_);
 313   switch (option) {
 314     case P2P_SOCKET_OPT_RCVBUF:
 315       return socket_->SetReceiveBufferSize(value) == net::OK;
 316     case P2P_SOCKET_OPT_SNDBUF:
 317       return socket_->SetSendBufferSize(value) == net::OK;
 318     case P2P_SOCKET_OPT_DSCP:
 319       return (net::OK == socket_->SetDiffServCodePoint(
 320           static_cast<net::DiffServCodePoint>(value))) ? true : false;
 321     default:
 322       NOTREACHED();
 323       return false;
 324   }
 325 }
 326
 327 }  // namespace content