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.
5 #include "content/browser/renderer_host/p2p/socket_host_udp.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"
22 // UDP packets cannot be bigger than 64k.
23 const int kReadBufferSize = 65536;
24 // Socket receive buffer size.
25 const int kRecvSocketBufferSize = 65536; // 64K
27 // Defines set of transient errors. These errors are ignored when we get them
28 // from sendto() or recvfrom() calls.
30 // net::ERR_OUT_OF_MEMORY
32 // This is caused by ENOBUFS which means the buffer of the network interface
35 // net::ERR_CONNECTION_RESET
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;
51 P2PSocketHostUdp::PendingPacket::PendingPacket(
52 const net::IPEndPoint& to,
53 const std::vector<char>& content,
54 const talk_base::PacketOptions& options,
57 data(new net::IOBuffer(content.size())),
59 packet_options(options),
61 memcpy(data->data(), &content[0], size);
64 P2PSocketHostUdp::PendingPacket::~PendingPacket() {
67 P2PSocketHostUdp::P2PSocketHostUdp(IPC::Sender* message_sender,
69 P2PMessageThrottler* throttler)
70 : P2PSocketHost(message_sender, id),
71 socket_(new net::UDPServerSocket(
72 GetContentClient()->browser()->GetNetLog(),
73 net::NetLog::Source())),
75 last_dscp_(net::DSCP_CS0),
76 throttler_(throttler) {
79 P2PSocketHostUdp::~P2PSocketHostUdp() {
80 if (state_ == STATE_OPEN) {
81 DCHECK(socket_.get());
86 bool P2PSocketHostUdp::Init(const net::IPEndPoint& local_address,
87 const P2PHostAndIPEndPoint& remote_address) {
88 DCHECK_EQ(state_, STATE_UNINITIALIZED);
90 int result = socket_->Listen(local_address);
92 LOG(ERROR) << "bind() failed: " << result;
97 // Setting recv socket buffer size.
98 if (!socket_->SetReceiveBufferSize(kRecvSocketBufferSize)) {
99 LOG(WARNING) << "Failed to set socket receive buffer size to "
100 << kRecvSocketBufferSize;
103 net::IPEndPoint address;
104 result = socket_->GetLocalAddress(&address);
106 LOG(ERROR) << "P2PSocketHostUdp::Init(): unable to get local address: "
111 VLOG(1) << "Local address: " << address.ToString();
115 message_sender_->Send(new P2PMsg_OnSocketCreated(id_, address));
117 recv_buffer_ = new net::IOBuffer(kReadBufferSize);
123 void P2PSocketHostUdp::OnError() {
127 if (state_ == STATE_UNINITIALIZED || state_ == STATE_OPEN)
128 message_sender_->Send(new P2PMsg_OnError(id_));
130 state_ = STATE_ERROR;
133 void P2PSocketHostUdp::DoRead() {
136 result = socket_->RecvFrom(
140 base::Bind(&P2PSocketHostUdp::OnRecv, base::Unretained(this)));
141 if (result == net::ERR_IO_PENDING)
143 HandleReadResult(result);
144 } while (state_ == STATE_OPEN);
147 void P2PSocketHostUdp::OnRecv(int result) {
148 HandleReadResult(result);
149 if (state_ == STATE_OPEN) {
154 void P2PSocketHostUdp::HandleReadResult(int result) {
155 DCHECK_EQ(STATE_OPEN, state_);
158 std::vector<char> data(recv_buffer_->data(), recv_buffer_->data() + result);
160 if (!ContainsKey(connected_peers_, recv_address_)) {
161 P2PSocketHost::StunMessageType type;
162 bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
163 if ((stun && IsRequestOrResponse(type))) {
164 connected_peers_.insert(recv_address_);
165 } else if (!stun || type == STUN_DATA_INDICATION) {
166 LOG(ERROR) << "Received unexpected data packet from "
167 << recv_address_.ToString()
168 << " before STUN binding is finished.";
173 message_sender_->Send(new P2PMsg_OnDataReceived(
174 id_, recv_address_, data, base::TimeTicks::Now()));
175 } else if (result < 0 && !IsTransientError(result)) {
176 LOG(ERROR) << "Error when reading from UDP socket: " << result;
181 void P2PSocketHostUdp::Send(const net::IPEndPoint& to,
182 const std::vector<char>& data,
183 const talk_base::PacketOptions& options,
186 // The Send message may be sent after the an OnError message was
187 // sent by hasn't been processed the renderer.
191 if (!ContainsKey(connected_peers_, to)) {
192 P2PSocketHost::StunMessageType type = P2PSocketHost::StunMessageType();
193 bool stun = GetStunPacketType(&*data.begin(), data.size(), &type);
194 if (!stun || type == STUN_DATA_INDICATION) {
195 LOG(ERROR) << "Page tried to send a data packet to " << to.ToString()
196 << " before STUN binding is finished.";
201 if (throttler_->DropNextPacket(data.size())) {
202 VLOG(0) << "STUN message is dropped due to high volume.";
203 // Do not reset socket.
209 send_queue_.push_back(PendingPacket(to, data, options, packet_id));
211 // TODO(mallinath: Remove unnecessary memcpy in this case.
212 PendingPacket packet(to, data, options, packet_id);
217 void P2PSocketHostUdp::DoSend(const PendingPacket& packet) {
218 TRACE_EVENT_ASYNC_STEP_INTO1("p2p", "Send", packet.id, "UdpAsyncSendTo",
219 "size", packet.size);
220 // Don't try to set DSCP in following conditions,
221 // 1. If the outgoing packet is set to DSCP_NO_CHANGE
222 // 2. If no change in DSCP value from last packet
223 // 3. If there is any error in setting DSCP on socket.
224 net::DiffServCodePoint dscp =
225 static_cast<net::DiffServCodePoint>(packet.packet_options.dscp);
226 if (dscp != net::DSCP_NO_CHANGE && last_dscp_ != dscp &&
227 last_dscp_ != net::DSCP_NO_CHANGE) {
228 int result = socket_->SetDiffServCodePoint(dscp);
229 if (result == net::OK) {
231 } else if (!IsTransientError(result) && last_dscp_ != net::DSCP_CS0) {
232 // We receieved a non-transient error, and it seems we have
233 // not changed the DSCP in the past, disable DSCP as it unlikely
234 // to work in the future.
235 last_dscp_ = net::DSCP_NO_CHANGE;
238 packet_processing_helpers::ApplyPacketOptions(
239 packet.data->data(), packet.size, packet.packet_options, 0);
240 int result = socket_->SendTo(
244 base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this), packet.id));
246 // sendto() may return an error, e.g. if we've received an ICMP Destination
247 // Unreachable message. When this happens try sending the same packet again,
248 // and just drop it if it fails again.
249 if (IsTransientError(result)) {
250 result = socket_->SendTo(
254 base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this),
258 if (result == net::ERR_IO_PENDING) {
259 send_pending_ = true;
261 HandleSendResult(packet.id, result);
265 void P2PSocketHostUdp::OnSend(uint64 packet_id, int result) {
266 DCHECK(send_pending_);
267 DCHECK_NE(result, net::ERR_IO_PENDING);
269 send_pending_ = false;
271 HandleSendResult(packet_id, result);
273 // Send next packets if we have them waiting in the buffer.
274 while (state_ == STATE_OPEN && !send_queue_.empty() && !send_pending_) {
275 DoSend(send_queue_.front());
276 send_queue_.pop_front();
280 void P2PSocketHostUdp::HandleSendResult(uint64 packet_id, int result) {
281 TRACE_EVENT_ASYNC_END1("p2p", "Send", packet_id,
284 message_sender_->Send(new P2PMsg_OnSendComplete(id_));
285 } else if (IsTransientError(result)) {
286 VLOG(0) << "sendto() has failed twice returning a "
287 " transient error. Dropping the packet.";
288 } else if (result < 0) {
289 LOG(ERROR) << "Error when sending data in UDP socket: " << result;
294 P2PSocketHost* P2PSocketHostUdp::AcceptIncomingTcpConnection(
295 const net::IPEndPoint& remote_address, int id) {
301 bool P2PSocketHostUdp::SetOption(P2PSocketOption option, int value) {
302 DCHECK_EQ(STATE_OPEN, state_);
304 case P2P_SOCKET_OPT_RCVBUF:
305 return socket_->SetReceiveBufferSize(value);
306 case P2P_SOCKET_OPT_SNDBUF:
307 return socket_->SetSendBufferSize(value);
308 case P2P_SOCKET_OPT_DSCP:
309 return (net::OK == socket_->SetDiffServCodePoint(
310 static_cast<net::DiffServCodePoint>(value))) ? true : false;
317 } // namespace content