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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2012 Google Inc. and Robin Seggelmann | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "talk/media/sctp/sctpdataengine.h" | |
| 29 | |
| 30 #include <stdarg.h> | |
| 31 #include <stdio.h> | |
| 32 #include <sstream> | |
| 33 #include <vector> | |
| 34 | |
| 35 #include "talk/media/base/codec.h" | |
| 36 #include "talk/media/base/constants.h" | |
| 37 #include "talk/media/base/streamparams.h" | |
| 38 #include "usrsctplib/usrsctp.h" | |
| 39 #include "webrtc/base/arraysize.h" | |
| 40 #include "webrtc/base/buffer.h" | |
| 41 #include "webrtc/base/helpers.h" | |
| 42 #include "webrtc/base/logging.h" | |
| 43 #include "webrtc/base/safe_conversions.h" | |
| 44 | |
| 45 namespace { | |
| 46 typedef cricket::SctpDataMediaChannel::StreamSet StreamSet; | |
| 47 // Returns a comma-separated, human-readable list of the stream IDs in 's' | |
| 48 std::string ListStreams(const StreamSet& s) { | |
| 49 std::stringstream result; | |
| 50 bool first = true; | |
| 51 for (StreamSet::const_iterator it = s.begin(); it != s.end(); ++it) { | |
| 52 if (!first) { | |
| 53 result << ", " << *it; | |
| 54 } else { | |
| 55 result << *it; | |
| 56 first = false; | |
| 57 } | |
| 58 } | |
| 59 return result.str(); | |
| 60 } | |
| 61 | |
| 62 // Returns a pipe-separated, human-readable list of the SCTP_STREAM_RESET | |
| 63 // flags in 'flags' | |
| 64 std::string ListFlags(int flags) { | |
| 65 std::stringstream result; | |
| 66 bool first = true; | |
| 67 // Skip past the first 12 chars (strlen("SCTP_STREAM_")) | |
| 68 #define MAKEFLAG(X) { X, #X + 12} | |
| 69 struct flaginfo_t { | |
| 70 int value; | |
| 71 const char* name; | |
| 72 } flaginfo[] = { | |
| 73 MAKEFLAG(SCTP_STREAM_RESET_INCOMING_SSN), | |
| 74 MAKEFLAG(SCTP_STREAM_RESET_OUTGOING_SSN), | |
| 75 MAKEFLAG(SCTP_STREAM_RESET_DENIED), | |
| 76 MAKEFLAG(SCTP_STREAM_RESET_FAILED), | |
| 77 MAKEFLAG(SCTP_STREAM_CHANGE_DENIED) | |
| 78 }; | |
| 79 #undef MAKEFLAG | |
| 80 for (int i = 0; i < arraysize(flaginfo); ++i) { | |
| 81 if (flags & flaginfo[i].value) { | |
| 82 if (!first) result << " | "; | |
| 83 result << flaginfo[i].name; | |
| 84 first = false; | |
| 85 } | |
| 86 } | |
| 87 return result.str(); | |
| 88 } | |
| 89 | |
| 90 // Returns a comma-separated, human-readable list of the integers in 'array'. | |
| 91 // All 'num_elems' of them. | |
| 92 std::string ListArray(const uint16_t* array, int num_elems) { | |
| 93 std::stringstream result; | |
| 94 for (int i = 0; i < num_elems; ++i) { | |
| 95 if (i) { | |
| 96 result << ", " << array[i]; | |
| 97 } else { | |
| 98 result << array[i]; | |
| 99 } | |
| 100 } | |
| 101 return result.str(); | |
| 102 } | |
| 103 } // namespace | |
| 104 | |
| 105 namespace cricket { | |
| 106 typedef rtc::ScopedMessageData<SctpInboundPacket> InboundPacketMessage; | |
| 107 typedef rtc::ScopedMessageData<rtc::Buffer> OutboundPacketMessage; | |
| 108 | |
| 109 // The biggest SCTP packet. Starting from a 'safe' wire MTU value of 1280, | |
| 110 // take off 80 bytes for DTLS/TURN/TCP/IP overhead. | |
| 111 static const size_t kSctpMtu = 1200; | |
| 112 | |
| 113 // The size of the SCTP association send buffer. 256kB, the usrsctp default. | |
| 114 static const int kSendBufferSize = 262144; | |
| 115 enum { | |
| 116 MSG_SCTPINBOUNDPACKET = 1, // MessageData is SctpInboundPacket | |
| 117 MSG_SCTPOUTBOUNDPACKET = 2, // MessageData is rtc:Buffer | |
| 118 }; | |
| 119 | |
| 120 struct SctpInboundPacket { | |
| 121 rtc::Buffer buffer; | |
| 122 ReceiveDataParams params; | |
| 123 // The |flags| parameter is used by SCTP to distinguish notification packets | |
| 124 // from other types of packets. | |
| 125 int flags; | |
| 126 }; | |
| 127 | |
| 128 // Helper for logging SCTP messages. | |
| 129 static void debug_sctp_printf(const char *format, ...) { | |
| 130 char s[255]; | |
| 131 va_list ap; | |
| 132 va_start(ap, format); | |
| 133 vsnprintf(s, sizeof(s), format, ap); | |
| 134 LOG(LS_INFO) << "SCTP: " << s; | |
| 135 va_end(ap); | |
| 136 } | |
| 137 | |
| 138 // Get the PPID to use for the terminating fragment of this type. | |
| 139 static SctpDataMediaChannel::PayloadProtocolIdentifier GetPpid( | |
| 140 cricket::DataMessageType type) { | |
| 141 switch (type) { | |
| 142 default: | |
| 143 case cricket::DMT_NONE: | |
| 144 return SctpDataMediaChannel::PPID_NONE; | |
| 145 case cricket::DMT_CONTROL: | |
| 146 return SctpDataMediaChannel::PPID_CONTROL; | |
| 147 case cricket::DMT_BINARY: | |
| 148 return SctpDataMediaChannel::PPID_BINARY_LAST; | |
| 149 case cricket::DMT_TEXT: | |
| 150 return SctpDataMediaChannel::PPID_TEXT_LAST; | |
| 151 }; | |
| 152 } | |
| 153 | |
| 154 static bool GetDataMediaType( | |
| 155 SctpDataMediaChannel::PayloadProtocolIdentifier ppid, | |
| 156 cricket::DataMessageType *dest) { | |
| 157 ASSERT(dest != NULL); | |
| 158 switch (ppid) { | |
| 159 case SctpDataMediaChannel::PPID_BINARY_PARTIAL: | |
| 160 case SctpDataMediaChannel::PPID_BINARY_LAST: | |
| 161 *dest = cricket::DMT_BINARY; | |
| 162 return true; | |
| 163 | |
| 164 case SctpDataMediaChannel::PPID_TEXT_PARTIAL: | |
| 165 case SctpDataMediaChannel::PPID_TEXT_LAST: | |
| 166 *dest = cricket::DMT_TEXT; | |
| 167 return true; | |
| 168 | |
| 169 case SctpDataMediaChannel::PPID_CONTROL: | |
| 170 *dest = cricket::DMT_CONTROL; | |
| 171 return true; | |
| 172 | |
| 173 case SctpDataMediaChannel::PPID_NONE: | |
| 174 *dest = cricket::DMT_NONE; | |
| 175 return true; | |
| 176 | |
| 177 default: | |
| 178 return false; | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 // Log the packet in text2pcap format, if log level is at LS_VERBOSE. | |
| 183 static void VerboseLogPacket(void *data, size_t length, int direction) { | |
| 184 if (LOG_CHECK_LEVEL(LS_VERBOSE) && length > 0) { | |
| 185 char *dump_buf; | |
| 186 if ((dump_buf = usrsctp_dumppacket( | |
| 187 data, length, direction)) != NULL) { | |
| 188 LOG(LS_VERBOSE) << dump_buf; | |
| 189 usrsctp_freedumpbuffer(dump_buf); | |
| 190 } | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 // This is the callback usrsctp uses when there's data to send on the network | |
| 195 // that has been wrapped appropriatly for the SCTP protocol. | |
| 196 static int OnSctpOutboundPacket(void* addr, void* data, size_t length, | |
| 197 uint8_t tos, uint8_t set_df) { | |
| 198 SctpDataMediaChannel* channel = static_cast<SctpDataMediaChannel*>(addr); | |
| 199 LOG(LS_VERBOSE) << "global OnSctpOutboundPacket():" | |
| 200 << "addr: " << addr << "; length: " << length | |
| 201 << "; tos: " << std::hex << static_cast<int>(tos) | |
| 202 << "; set_df: " << std::hex << static_cast<int>(set_df); | |
| 203 | |
| 204 VerboseLogPacket(addr, length, SCTP_DUMP_OUTBOUND); | |
| 205 // Note: We have to copy the data; the caller will delete it. | |
| 206 auto* msg = new OutboundPacketMessage( | |
| 207 new rtc::Buffer(reinterpret_cast<uint8_t*>(data), length)); | |
| 208 channel->worker_thread()->Post(channel, MSG_SCTPOUTBOUNDPACKET, msg); | |
| 209 return 0; | |
| 210 } | |
| 211 | |
| 212 // This is the callback called from usrsctp when data has been received, after | |
| 213 // a packet has been interpreted and parsed by usrsctp and found to contain | |
| 214 // payload data. It is called by a usrsctp thread. It is assumed this function | |
| 215 // will free the memory used by 'data'. | |
| 216 static int OnSctpInboundPacket(struct socket* sock, union sctp_sockstore addr, | |
| 217 void* data, size_t length, | |
| 218 struct sctp_rcvinfo rcv, int flags, | |
| 219 void* ulp_info) { | |
| 220 SctpDataMediaChannel* channel = static_cast<SctpDataMediaChannel*>(ulp_info); | |
| 221 // Post data to the channel's receiver thread (copying it). | |
| 222 // TODO(ldixon): Unclear if copy is needed as this method is responsible for | |
| 223 // memory cleanup. But this does simplify code. | |
| 224 const SctpDataMediaChannel::PayloadProtocolIdentifier ppid = | |
| 225 static_cast<SctpDataMediaChannel::PayloadProtocolIdentifier>( | |
| 226 rtc::HostToNetwork32(rcv.rcv_ppid)); | |
| 227 cricket::DataMessageType type = cricket::DMT_NONE; | |
| 228 if (!GetDataMediaType(ppid, &type) && !(flags & MSG_NOTIFICATION)) { | |
| 229 // It's neither a notification nor a recognized data packet. Drop it. | |
| 230 LOG(LS_ERROR) << "Received an unknown PPID " << ppid | |
| 231 << " on an SCTP packet. Dropping."; | |
| 232 } else { | |
| 233 SctpInboundPacket* packet = new SctpInboundPacket; | |
| 234 packet->buffer.SetData(reinterpret_cast<uint8_t*>(data), length); | |
| 235 packet->params.ssrc = rcv.rcv_sid; | |
| 236 packet->params.seq_num = rcv.rcv_ssn; | |
| 237 packet->params.timestamp = rcv.rcv_tsn; | |
| 238 packet->params.type = type; | |
| 239 packet->flags = flags; | |
| 240 // The ownership of |packet| transfers to |msg|. | |
| 241 InboundPacketMessage* msg = new InboundPacketMessage(packet); | |
| 242 channel->worker_thread()->Post(channel, MSG_SCTPINBOUNDPACKET, msg); | |
| 243 } | |
| 244 free(data); | |
| 245 return 1; | |
| 246 } | |
| 247 | |
| 248 // Set the initial value of the static SCTP Data Engines reference count. | |
| 249 int SctpDataEngine::usrsctp_engines_count = 0; | |
| 250 | |
| 251 SctpDataEngine::SctpDataEngine() { | |
| 252 if (usrsctp_engines_count == 0) { | |
| 253 // First argument is udp_encapsulation_port, which is not releveant for our | |
| 254 // AF_CONN use of sctp. | |
| 255 usrsctp_init(0, cricket::OnSctpOutboundPacket, debug_sctp_printf); | |
| 256 | |
| 257 // To turn on/off detailed SCTP debugging. You will also need to have the | |
| 258 // SCTP_DEBUG cpp defines flag. | |
| 259 // usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_ALL); | |
| 260 | |
| 261 // TODO(ldixon): Consider turning this on/off. | |
| 262 usrsctp_sysctl_set_sctp_ecn_enable(0); | |
| 263 | |
| 264 // This is harmless, but we should find out when the library default | |
| 265 // changes. | |
| 266 int send_size = usrsctp_sysctl_get_sctp_sendspace(); | |
| 267 if (send_size != kSendBufferSize) { | |
| 268 LOG(LS_ERROR) << "Got different send size than expected: " << send_size; | |
| 269 } | |
| 270 | |
| 271 // TODO(ldixon): Consider turning this on/off. | |
| 272 // This is not needed right now (we don't do dynamic address changes): | |
| 273 // If SCTP Auto-ASCONF is enabled, the peer is informed automatically | |
| 274 // when a new address is added or removed. This feature is enabled by | |
| 275 // default. | |
| 276 // usrsctp_sysctl_set_sctp_auto_asconf(0); | |
| 277 | |
| 278 // TODO(ldixon): Consider turning this on/off. | |
| 279 // Add a blackhole sysctl. Setting it to 1 results in no ABORTs | |
| 280 // being sent in response to INITs, setting it to 2 results | |
| 281 // in no ABORTs being sent for received OOTB packets. | |
| 282 // This is similar to the TCP sysctl. | |
| 283 // | |
| 284 // See: http://lakerest.net/pipermail/sctp-coders/2012-January/009438.html | |
| 285 // See: http://svnweb.freebsd.org/base?view=revision&revision=229805 | |
| 286 // usrsctp_sysctl_set_sctp_blackhole(2); | |
| 287 | |
| 288 // Set the number of default outgoing streams. This is the number we'll | |
| 289 // send in the SCTP INIT message. The 'appropriate default' in the | |
| 290 // second paragraph of | |
| 291 // http://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-05#section-6.2 | |
| 292 // is cricket::kMaxSctpSid. | |
| 293 usrsctp_sysctl_set_sctp_nr_outgoing_streams_default( | |
| 294 cricket::kMaxSctpSid); | |
| 295 } | |
| 296 usrsctp_engines_count++; | |
| 297 | |
| 298 cricket::DataCodec codec(kGoogleSctpDataCodecId, kGoogleSctpDataCodecName, 0); | |
| 299 codec.SetParam(kCodecParamPort, kSctpDefaultPort); | |
| 300 codecs_.push_back(codec); | |
| 301 } | |
| 302 | |
| 303 SctpDataEngine::~SctpDataEngine() { | |
| 304 usrsctp_engines_count--; | |
| 305 LOG(LS_VERBOSE) << "usrsctp_engines_count:" << usrsctp_engines_count; | |
| 306 | |
| 307 if (usrsctp_engines_count == 0) { | |
| 308 // usrsctp_finish() may fail if it's called too soon after the channels are | |
| 309 // closed. Wait and try again until it succeeds for up to 3 seconds. | |
| 310 for (size_t i = 0; i < 300; ++i) { | |
| 311 if (usrsctp_finish() == 0) | |
| 312 return; | |
| 313 | |
| 314 rtc::Thread::SleepMs(10); | |
| 315 } | |
| 316 LOG(LS_ERROR) << "Failed to shutdown usrsctp."; | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 DataMediaChannel* SctpDataEngine::CreateChannel( | |
| 321 DataChannelType data_channel_type) { | |
| 322 if (data_channel_type != DCT_SCTP) { | |
| 323 return NULL; | |
| 324 } | |
| 325 return new SctpDataMediaChannel(rtc::Thread::Current()); | |
| 326 } | |
| 327 | |
| 328 // static | |
| 329 SctpDataMediaChannel* SctpDataEngine::GetChannelFromSocket( | |
| 330 struct socket* sock) { | |
| 331 struct sockaddr* addrs = nullptr; | |
| 332 int naddrs = usrsctp_getladdrs(sock, 0, &addrs); | |
| 333 if (naddrs <= 0 || addrs[0].sa_family != AF_CONN) { | |
| 334 return nullptr; | |
| 335 } | |
| 336 // usrsctp_getladdrs() returns the addresses bound to this socket, which | |
| 337 // contains the SctpDataMediaChannel* as sconn_addr. Read the pointer, | |
| 338 // then free the list of addresses once we have the pointer. We only open | |
| 339 // AF_CONN sockets, and they should all have the sconn_addr set to the | |
| 340 // pointer that created them, so [0] is as good as any other. | |
| 341 struct sockaddr_conn* sconn = | |
| 342 reinterpret_cast<struct sockaddr_conn*>(&addrs[0]); | |
| 343 SctpDataMediaChannel* channel = | |
| 344 reinterpret_cast<SctpDataMediaChannel*>(sconn->sconn_addr); | |
| 345 usrsctp_freeladdrs(addrs); | |
| 346 | |
| 347 return channel; | |
| 348 } | |
| 349 | |
| 350 // static | |
| 351 int SctpDataEngine::SendThresholdCallback(struct socket* sock, | |
| 352 uint32_t sb_free) { | |
| 353 // Fired on our I/O thread. SctpDataMediaChannel::OnPacketReceived() gets | |
| 354 // a packet containing acknowledgments, which goes into usrsctp_conninput, | |
| 355 // and then back here. | |
| 356 SctpDataMediaChannel* channel = GetChannelFromSocket(sock); | |
| 357 if (!channel) { | |
| 358 LOG(LS_ERROR) << "SendThresholdCallback: Failed to get channel for socket " | |
| 359 << sock; | |
| 360 return 0; | |
| 361 } | |
| 362 channel->OnSendThresholdCallback(); | |
| 363 return 0; | |
| 364 } | |
| 365 | |
| 366 SctpDataMediaChannel::SctpDataMediaChannel(rtc::Thread* thread) | |
| 367 : worker_thread_(thread), | |
| 368 local_port_(kSctpDefaultPort), | |
| 369 remote_port_(kSctpDefaultPort), | |
| 370 sock_(NULL), | |
| 371 sending_(false), | |
| 372 receiving_(false), | |
| 373 debug_name_("SctpDataMediaChannel") { | |
| 374 } | |
| 375 | |
| 376 SctpDataMediaChannel::~SctpDataMediaChannel() { | |
| 377 CloseSctpSocket(); | |
| 378 } | |
| 379 | |
| 380 void SctpDataMediaChannel::OnSendThresholdCallback() { | |
| 381 RTC_DCHECK(rtc::Thread::Current() == worker_thread_); | |
| 382 SignalReadyToSend(true); | |
| 383 } | |
| 384 | |
| 385 sockaddr_conn SctpDataMediaChannel::GetSctpSockAddr(int port) { | |
| 386 sockaddr_conn sconn = {0}; | |
| 387 sconn.sconn_family = AF_CONN; | |
| 388 #ifdef HAVE_SCONN_LEN | |
| 389 sconn.sconn_len = sizeof(sockaddr_conn); | |
| 390 #endif | |
| 391 // Note: conversion from int to uint16_t happens here. | |
| 392 sconn.sconn_port = rtc::HostToNetwork16(port); | |
| 393 sconn.sconn_addr = this; | |
| 394 return sconn; | |
| 395 } | |
| 396 | |
| 397 bool SctpDataMediaChannel::OpenSctpSocket() { | |
| 398 if (sock_) { | |
| 399 LOG(LS_VERBOSE) << debug_name_ | |
| 400 << "->Ignoring attempt to re-create existing socket."; | |
| 401 return false; | |
| 402 } | |
| 403 | |
| 404 // If kSendBufferSize isn't reflective of reality, we log an error, but we | |
| 405 // still have to do something reasonable here. Look up what the buffer's | |
| 406 // real size is and set our threshold to something reasonable. | |
| 407 const static int kSendThreshold = usrsctp_sysctl_get_sctp_sendspace() / 2; | |
| 408 | |
| 409 sock_ = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, | |
| 410 cricket::OnSctpInboundPacket, | |
| 411 &SctpDataEngine::SendThresholdCallback, | |
| 412 kSendThreshold, this); | |
| 413 if (!sock_) { | |
| 414 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to create SCTP socket."; | |
| 415 return false; | |
| 416 } | |
| 417 | |
| 418 // Make the socket non-blocking. Connect, close, shutdown etc will not block | |
| 419 // the thread waiting for the socket operation to complete. | |
| 420 if (usrsctp_set_non_blocking(sock_, 1) < 0) { | |
| 421 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP to non blocking."; | |
| 422 return false; | |
| 423 } | |
| 424 | |
| 425 // This ensures that the usrsctp close call deletes the association. This | |
| 426 // prevents usrsctp from calling OnSctpOutboundPacket with references to | |
| 427 // this class as the address. | |
| 428 linger linger_opt; | |
| 429 linger_opt.l_onoff = 1; | |
| 430 linger_opt.l_linger = 0; | |
| 431 if (usrsctp_setsockopt(sock_, SOL_SOCKET, SO_LINGER, &linger_opt, | |
| 432 sizeof(linger_opt))) { | |
| 433 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SO_LINGER."; | |
| 434 return false; | |
| 435 } | |
| 436 | |
| 437 // Enable stream ID resets. | |
| 438 struct sctp_assoc_value stream_rst; | |
| 439 stream_rst.assoc_id = SCTP_ALL_ASSOC; | |
| 440 stream_rst.assoc_value = 1; | |
| 441 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET, | |
| 442 &stream_rst, sizeof(stream_rst))) { | |
| 443 LOG_ERRNO(LS_ERROR) << debug_name_ | |
| 444 << "Failed to set SCTP_ENABLE_STREAM_RESET."; | |
| 445 return false; | |
| 446 } | |
| 447 | |
| 448 // Nagle. | |
| 449 uint32_t nodelay = 1; | |
| 450 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_NODELAY, &nodelay, | |
| 451 sizeof(nodelay))) { | |
| 452 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP_NODELAY."; | |
| 453 return false; | |
| 454 } | |
| 455 | |
| 456 // Disable MTU discovery | |
| 457 sctp_paddrparams params = {{0}}; | |
| 458 params.spp_assoc_id = 0; | |
| 459 params.spp_flags = SPP_PMTUD_DISABLE; | |
| 460 params.spp_pathmtu = kSctpMtu; | |
| 461 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS, ¶ms, | |
| 462 sizeof(params))) { | |
| 463 LOG_ERRNO(LS_ERROR) << debug_name_ | |
| 464 << "Failed to set SCTP_PEER_ADDR_PARAMS."; | |
| 465 return false; | |
| 466 } | |
| 467 | |
| 468 // Subscribe to SCTP event notifications. | |
| 469 int event_types[] = {SCTP_ASSOC_CHANGE, | |
| 470 SCTP_PEER_ADDR_CHANGE, | |
| 471 SCTP_SEND_FAILED_EVENT, | |
| 472 SCTP_SENDER_DRY_EVENT, | |
| 473 SCTP_STREAM_RESET_EVENT}; | |
| 474 struct sctp_event event = {0}; | |
| 475 event.se_assoc_id = SCTP_ALL_ASSOC; | |
| 476 event.se_on = 1; | |
| 477 for (size_t i = 0; i < arraysize(event_types); i++) { | |
| 478 event.se_type = event_types[i]; | |
| 479 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_EVENT, &event, | |
| 480 sizeof(event)) < 0) { | |
| 481 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP_EVENT type: " | |
| 482 << event.se_type; | |
| 483 return false; | |
| 484 } | |
| 485 } | |
| 486 | |
| 487 // Register this class as an address for usrsctp. This is used by SCTP to | |
| 488 // direct the packets received (by the created socket) to this class. | |
| 489 usrsctp_register_address(this); | |
| 490 sending_ = true; | |
| 491 return true; | |
| 492 } | |
| 493 | |
| 494 void SctpDataMediaChannel::CloseSctpSocket() { | |
| 495 sending_ = false; | |
| 496 if (sock_) { | |
| 497 // We assume that SO_LINGER option is set to close the association when | |
| 498 // close is called. This means that any pending packets in usrsctp will be | |
| 499 // discarded instead of being sent. | |
| 500 usrsctp_close(sock_); | |
| 501 sock_ = NULL; | |
| 502 usrsctp_deregister_address(this); | |
| 503 } | |
| 504 } | |
| 505 | |
| 506 bool SctpDataMediaChannel::Connect() { | |
| 507 LOG(LS_VERBOSE) << debug_name_ << "->Connect()."; | |
| 508 | |
| 509 // If we already have a socket connection, just return. | |
| 510 if (sock_) { | |
| 511 LOG(LS_WARNING) << debug_name_ << "->Connect(): Ignored as socket " | |
| 512 "is already established."; | |
| 513 return true; | |
| 514 } | |
| 515 | |
| 516 // If no socket (it was closed) try to start it again. This can happen when | |
| 517 // the socket we are connecting to closes, does an sctp shutdown handshake, | |
| 518 // or behaves unexpectedly causing us to perform a CloseSctpSocket. | |
| 519 if (!sock_ && !OpenSctpSocket()) { | |
| 520 return false; | |
| 521 } | |
| 522 | |
| 523 // Note: conversion from int to uint16_t happens on assignment. | |
| 524 sockaddr_conn local_sconn = GetSctpSockAddr(local_port_); | |
| 525 if (usrsctp_bind(sock_, reinterpret_cast<sockaddr *>(&local_sconn), | |
| 526 sizeof(local_sconn)) < 0) { | |
| 527 LOG_ERRNO(LS_ERROR) << debug_name_ << "->Connect(): " | |
| 528 << ("Failed usrsctp_bind"); | |
| 529 CloseSctpSocket(); | |
| 530 return false; | |
| 531 } | |
| 532 | |
| 533 // Note: conversion from int to uint16_t happens on assignment. | |
| 534 sockaddr_conn remote_sconn = GetSctpSockAddr(remote_port_); | |
| 535 int connect_result = usrsctp_connect( | |
| 536 sock_, reinterpret_cast<sockaddr *>(&remote_sconn), sizeof(remote_sconn)); | |
| 537 if (connect_result < 0 && errno != SCTP_EINPROGRESS) { | |
| 538 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed usrsctp_connect. got errno=" | |
| 539 << errno << ", but wanted " << SCTP_EINPROGRESS; | |
| 540 CloseSctpSocket(); | |
| 541 return false; | |
| 542 } | |
| 543 return true; | |
| 544 } | |
| 545 | |
| 546 void SctpDataMediaChannel::Disconnect() { | |
| 547 // TODO(ldixon): Consider calling |usrsctp_shutdown(sock_, ...)| to do a | |
| 548 // shutdown handshake and remove the association. | |
| 549 CloseSctpSocket(); | |
| 550 } | |
| 551 | |
| 552 bool SctpDataMediaChannel::SetSend(bool send) { | |
| 553 if (!sending_ && send) { | |
| 554 return Connect(); | |
| 555 } | |
| 556 if (sending_ && !send) { | |
| 557 Disconnect(); | |
| 558 } | |
| 559 return true; | |
| 560 } | |
| 561 | |
| 562 bool SctpDataMediaChannel::SetReceive(bool receive) { | |
| 563 receiving_ = receive; | |
| 564 return true; | |
| 565 } | |
| 566 | |
| 567 bool SctpDataMediaChannel::SetSendParameters(const DataSendParameters& params) { | |
| 568 return SetSendCodecs(params.codecs); | |
| 569 } | |
| 570 | |
| 571 bool SctpDataMediaChannel::SetRecvParameters(const DataRecvParameters& params) { | |
| 572 return SetRecvCodecs(params.codecs); | |
| 573 } | |
| 574 | |
| 575 bool SctpDataMediaChannel::AddSendStream(const StreamParams& stream) { | |
| 576 return AddStream(stream); | |
| 577 } | |
| 578 | |
| 579 bool SctpDataMediaChannel::RemoveSendStream(uint32_t ssrc) { | |
| 580 return ResetStream(ssrc); | |
| 581 } | |
| 582 | |
| 583 bool SctpDataMediaChannel::AddRecvStream(const StreamParams& stream) { | |
| 584 // SCTP DataChannels are always bi-directional and calling AddSendStream will | |
| 585 // enable both sending and receiving on the stream. So AddRecvStream is a | |
| 586 // no-op. | |
| 587 return true; | |
| 588 } | |
| 589 | |
| 590 bool SctpDataMediaChannel::RemoveRecvStream(uint32_t ssrc) { | |
| 591 // SCTP DataChannels are always bi-directional and calling RemoveSendStream | |
| 592 // will disable both sending and receiving on the stream. So RemoveRecvStream | |
| 593 // is a no-op. | |
| 594 return true; | |
| 595 } | |
| 596 | |
| 597 bool SctpDataMediaChannel::SendData( | |
| 598 const SendDataParams& params, | |
| 599 const rtc::Buffer& payload, | |
| 600 SendDataResult* result) { | |
| 601 if (result) { | |
| 602 // Preset |result| to assume an error. If SendData succeeds, we'll | |
| 603 // overwrite |*result| once more at the end. | |
| 604 *result = SDR_ERROR; | |
| 605 } | |
| 606 | |
| 607 if (!sending_) { | |
| 608 LOG(LS_WARNING) << debug_name_ << "->SendData(...): " | |
| 609 << "Not sending packet with ssrc=" << params.ssrc | |
| 610 << " len=" << payload.size() << " before SetSend(true)."; | |
| 611 return false; | |
| 612 } | |
| 613 | |
| 614 if (params.type != cricket::DMT_CONTROL && | |
| 615 open_streams_.find(params.ssrc) == open_streams_.end()) { | |
| 616 LOG(LS_WARNING) << debug_name_ << "->SendData(...): " | |
| 617 << "Not sending data because ssrc is unknown: " | |
| 618 << params.ssrc; | |
| 619 return false; | |
| 620 } | |
| 621 | |
| 622 // | |
| 623 // Send data using SCTP. | |
| 624 ssize_t send_res = 0; // result from usrsctp_sendv. | |
| 625 struct sctp_sendv_spa spa = {0}; | |
| 626 spa.sendv_flags |= SCTP_SEND_SNDINFO_VALID; | |
| 627 spa.sendv_sndinfo.snd_sid = params.ssrc; | |
| 628 spa.sendv_sndinfo.snd_ppid = rtc::HostToNetwork32( | |
| 629 GetPpid(params.type)); | |
| 630 | |
| 631 // Ordered implies reliable. | |
| 632 if (!params.ordered) { | |
| 633 spa.sendv_sndinfo.snd_flags |= SCTP_UNORDERED; | |
| 634 if (params.max_rtx_count >= 0 || params.max_rtx_ms == 0) { | |
| 635 spa.sendv_flags |= SCTP_SEND_PRINFO_VALID; | |
| 636 spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_RTX; | |
| 637 spa.sendv_prinfo.pr_value = params.max_rtx_count; | |
| 638 } else { | |
| 639 spa.sendv_flags |= SCTP_SEND_PRINFO_VALID; | |
| 640 spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_TTL; | |
| 641 spa.sendv_prinfo.pr_value = params.max_rtx_ms; | |
| 642 } | |
| 643 } | |
| 644 | |
| 645 // We don't fragment. | |
| 646 send_res = usrsctp_sendv( | |
| 647 sock_, payload.data(), static_cast<size_t>(payload.size()), NULL, 0, &spa, | |
| 648 rtc::checked_cast<socklen_t>(sizeof(spa)), SCTP_SENDV_SPA, 0); | |
| 649 if (send_res < 0) { | |
| 650 if (errno == SCTP_EWOULDBLOCK) { | |
| 651 *result = SDR_BLOCK; | |
| 652 LOG(LS_INFO) << debug_name_ << "->SendData(...): EWOULDBLOCK returned"; | |
| 653 } else { | |
| 654 LOG_ERRNO(LS_ERROR) << "ERROR:" << debug_name_ | |
| 655 << "->SendData(...): " | |
| 656 << " usrsctp_sendv: "; | |
| 657 } | |
| 658 return false; | |
| 659 } | |
| 660 if (result) { | |
| 661 // Only way out now is success. | |
| 662 *result = SDR_SUCCESS; | |
| 663 } | |
| 664 return true; | |
| 665 } | |
| 666 | |
| 667 // Called by network interface when a packet has been received. | |
| 668 void SctpDataMediaChannel::OnPacketReceived( | |
| 669 rtc::Buffer* packet, const rtc::PacketTime& packet_time) { | |
| 670 RTC_DCHECK(rtc::Thread::Current() == worker_thread_); | |
| 671 LOG(LS_VERBOSE) << debug_name_ << "->OnPacketReceived(...): " | |
| 672 << " length=" << packet->size() << ", sending: " << sending_; | |
| 673 // Only give receiving packets to usrsctp after if connected. This enables two | |
| 674 // peers to each make a connect call, but for them not to receive an INIT | |
| 675 // packet before they have called connect; least the last receiver of the INIT | |
| 676 // packet will have called connect, and a connection will be established. | |
| 677 if (sending_) { | |
| 678 // Pass received packet to SCTP stack. Once processed by usrsctp, the data | |
| 679 // will be will be given to the global OnSctpInboundData, and then, | |
| 680 // marshalled by a Post and handled with OnMessage. | |
| 681 VerboseLogPacket(packet->data(), packet->size(), SCTP_DUMP_INBOUND); | |
| 682 usrsctp_conninput(this, packet->data(), packet->size(), 0); | |
| 683 } else { | |
| 684 // TODO(ldixon): Consider caching the packet for very slightly better | |
| 685 // reliability. | |
| 686 } | |
| 687 } | |
| 688 | |
| 689 void SctpDataMediaChannel::OnInboundPacketFromSctpToChannel( | |
| 690 SctpInboundPacket* packet) { | |
| 691 LOG(LS_VERBOSE) << debug_name_ << "->OnInboundPacketFromSctpToChannel(...): " | |
| 692 << "Received SCTP data:" | |
| 693 << " ssrc=" << packet->params.ssrc | |
| 694 << " notification: " << (packet->flags & MSG_NOTIFICATION) | |
| 695 << " length=" << packet->buffer.size(); | |
| 696 // Sending a packet with data == NULL (no data) is SCTPs "close the | |
| 697 // connection" message. This sets sock_ = NULL; | |
| 698 if (!packet->buffer.size() || !packet->buffer.data()) { | |
| 699 LOG(LS_INFO) << debug_name_ << "->OnInboundPacketFromSctpToChannel(...): " | |
| 700 "No data, closing."; | |
| 701 return; | |
| 702 } | |
| 703 if (packet->flags & MSG_NOTIFICATION) { | |
| 704 OnNotificationFromSctp(&packet->buffer); | |
| 705 } else { | |
| 706 OnDataFromSctpToChannel(packet->params, &packet->buffer); | |
| 707 } | |
| 708 } | |
| 709 | |
| 710 void SctpDataMediaChannel::OnDataFromSctpToChannel( | |
| 711 const ReceiveDataParams& params, rtc::Buffer* buffer) { | |
| 712 if (receiving_) { | |
| 713 LOG(LS_VERBOSE) << debug_name_ << "->OnDataFromSctpToChannel(...): " | |
| 714 << "Posting with length: " << buffer->size() | |
| 715 << " on stream " << params.ssrc; | |
| 716 // Reports all received messages to upper layers, no matter whether the sid | |
| 717 // is known. | |
| 718 SignalDataReceived(params, buffer->data<char>(), buffer->size()); | |
| 719 } else { | |
| 720 LOG(LS_WARNING) << debug_name_ << "->OnDataFromSctpToChannel(...): " | |
| 721 << "Not receiving packet with sid=" << params.ssrc | |
| 722 << " len=" << buffer->size() << " before SetReceive(true)."; | |
| 723 } | |
| 724 } | |
| 725 | |
| 726 bool SctpDataMediaChannel::AddStream(const StreamParams& stream) { | |
| 727 if (!stream.has_ssrcs()) { | |
| 728 return false; | |
| 729 } | |
| 730 | |
| 731 const uint32_t ssrc = stream.first_ssrc(); | |
| 732 if (ssrc >= cricket::kMaxSctpSid) { | |
| 733 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): " | |
| 734 << "Not adding data stream '" << stream.id | |
| 735 << "' with ssrc=" << ssrc | |
| 736 << " because stream ssrc is too high."; | |
| 737 return false; | |
| 738 } else if (open_streams_.find(ssrc) != open_streams_.end()) { | |
| 739 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): " | |
| 740 << "Not adding data stream '" << stream.id | |
| 741 << "' with ssrc=" << ssrc | |
| 742 << " because stream is already open."; | |
| 743 return false; | |
| 744 } else if (queued_reset_streams_.find(ssrc) != queued_reset_streams_.end() | |
| 745 || sent_reset_streams_.find(ssrc) != sent_reset_streams_.end()) { | |
| 746 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): " | |
| 747 << "Not adding data stream '" << stream.id | |
| 748 << "' with ssrc=" << ssrc | |
| 749 << " because stream is still closing."; | |
| 750 return false; | |
| 751 } | |
| 752 | |
| 753 open_streams_.insert(ssrc); | |
| 754 return true; | |
| 755 } | |
| 756 | |
| 757 bool SctpDataMediaChannel::ResetStream(uint32_t ssrc) { | |
| 758 // We typically get this called twice for the same stream, once each for | |
| 759 // Send and Recv. | |
| 760 StreamSet::iterator found = open_streams_.find(ssrc); | |
| 761 | |
| 762 if (found == open_streams_.end()) { | |
| 763 LOG(LS_VERBOSE) << debug_name_ << "->ResetStream(" << ssrc << "): " | |
| 764 << "stream not found."; | |
| 765 return false; | |
| 766 } else { | |
| 767 LOG(LS_VERBOSE) << debug_name_ << "->ResetStream(" << ssrc << "): " | |
| 768 << "Removing and queuing RE-CONFIG chunk."; | |
| 769 open_streams_.erase(found); | |
| 770 } | |
| 771 | |
| 772 // SCTP won't let you have more than one stream reset pending at a time, but | |
| 773 // you can close multiple streams in a single reset. So, we keep an internal | |
| 774 // queue of streams-to-reset, and send them as one reset message in | |
| 775 // SendQueuedStreamResets(). | |
| 776 queued_reset_streams_.insert(ssrc); | |
| 777 | |
| 778 // Signal our stream-reset logic that it should try to send now, if it can. | |
| 779 SendQueuedStreamResets(); | |
| 780 | |
| 781 // The stream will actually get removed when we get the acknowledgment. | |
| 782 return true; | |
| 783 } | |
| 784 | |
| 785 void SctpDataMediaChannel::OnNotificationFromSctp(rtc::Buffer* buffer) { | |
| 786 const sctp_notification& notification = | |
| 787 reinterpret_cast<const sctp_notification&>(*buffer->data()); | |
| 788 ASSERT(notification.sn_header.sn_length == buffer->size()); | |
| 789 | |
| 790 // TODO(ldixon): handle notifications appropriately. | |
| 791 switch (notification.sn_header.sn_type) { | |
| 792 case SCTP_ASSOC_CHANGE: | |
| 793 LOG(LS_VERBOSE) << "SCTP_ASSOC_CHANGE"; | |
| 794 OnNotificationAssocChange(notification.sn_assoc_change); | |
| 795 break; | |
| 796 case SCTP_REMOTE_ERROR: | |
| 797 LOG(LS_INFO) << "SCTP_REMOTE_ERROR"; | |
| 798 break; | |
| 799 case SCTP_SHUTDOWN_EVENT: | |
| 800 LOG(LS_INFO) << "SCTP_SHUTDOWN_EVENT"; | |
| 801 break; | |
| 802 case SCTP_ADAPTATION_INDICATION: | |
| 803 LOG(LS_INFO) << "SCTP_ADAPTATION_INDICATION"; | |
| 804 break; | |
| 805 case SCTP_PARTIAL_DELIVERY_EVENT: | |
| 806 LOG(LS_INFO) << "SCTP_PARTIAL_DELIVERY_EVENT"; | |
| 807 break; | |
| 808 case SCTP_AUTHENTICATION_EVENT: | |
| 809 LOG(LS_INFO) << "SCTP_AUTHENTICATION_EVENT"; | |
| 810 break; | |
| 811 case SCTP_SENDER_DRY_EVENT: | |
| 812 LOG(LS_VERBOSE) << "SCTP_SENDER_DRY_EVENT"; | |
| 813 SignalReadyToSend(true); | |
| 814 break; | |
| 815 // TODO(ldixon): Unblock after congestion. | |
| 816 case SCTP_NOTIFICATIONS_STOPPED_EVENT: | |
| 817 LOG(LS_INFO) << "SCTP_NOTIFICATIONS_STOPPED_EVENT"; | |
| 818 break; | |
| 819 case SCTP_SEND_FAILED_EVENT: | |
| 820 LOG(LS_INFO) << "SCTP_SEND_FAILED_EVENT"; | |
| 821 break; | |
| 822 case SCTP_STREAM_RESET_EVENT: | |
| 823 OnStreamResetEvent(¬ification.sn_strreset_event); | |
| 824 break; | |
| 825 case SCTP_ASSOC_RESET_EVENT: | |
| 826 LOG(LS_INFO) << "SCTP_ASSOC_RESET_EVENT"; | |
| 827 break; | |
| 828 case SCTP_STREAM_CHANGE_EVENT: | |
| 829 LOG(LS_INFO) << "SCTP_STREAM_CHANGE_EVENT"; | |
| 830 // An acknowledgment we get after our stream resets have gone through, | |
| 831 // if they've failed. We log the message, but don't react -- we don't | |
| 832 // keep around the last-transmitted set of SSIDs we wanted to close for | |
| 833 // error recovery. It doesn't seem likely to occur, and if so, likely | |
| 834 // harmless within the lifetime of a single SCTP association. | |
| 835 break; | |
| 836 default: | |
| 837 LOG(LS_WARNING) << "Unknown SCTP event: " | |
| 838 << notification.sn_header.sn_type; | |
| 839 break; | |
| 840 } | |
| 841 } | |
| 842 | |
| 843 void SctpDataMediaChannel::OnNotificationAssocChange( | |
| 844 const sctp_assoc_change& change) { | |
| 845 switch (change.sac_state) { | |
| 846 case SCTP_COMM_UP: | |
| 847 LOG(LS_VERBOSE) << "Association change SCTP_COMM_UP"; | |
| 848 break; | |
| 849 case SCTP_COMM_LOST: | |
| 850 LOG(LS_INFO) << "Association change SCTP_COMM_LOST"; | |
| 851 break; | |
| 852 case SCTP_RESTART: | |
| 853 LOG(LS_INFO) << "Association change SCTP_RESTART"; | |
| 854 break; | |
| 855 case SCTP_SHUTDOWN_COMP: | |
| 856 LOG(LS_INFO) << "Association change SCTP_SHUTDOWN_COMP"; | |
| 857 break; | |
| 858 case SCTP_CANT_STR_ASSOC: | |
| 859 LOG(LS_INFO) << "Association change SCTP_CANT_STR_ASSOC"; | |
| 860 break; | |
| 861 default: | |
| 862 LOG(LS_INFO) << "Association change UNKNOWN"; | |
| 863 break; | |
| 864 } | |
| 865 } | |
| 866 | |
| 867 void SctpDataMediaChannel::OnStreamResetEvent( | |
| 868 const struct sctp_stream_reset_event* evt) { | |
| 869 // A stream reset always involves two RE-CONFIG chunks for us -- we always | |
| 870 // simultaneously reset a sid's sequence number in both directions. The | |
| 871 // requesting side transmits a RE-CONFIG chunk and waits for the peer to send | |
| 872 // one back. Both sides get this SCTP_STREAM_RESET_EVENT when they receive | |
| 873 // RE-CONFIGs. | |
| 874 const int num_ssrcs = (evt->strreset_length - sizeof(*evt)) / | |
| 875 sizeof(evt->strreset_stream_list[0]); | |
| 876 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_ | |
| 877 << "): Flags = 0x" | |
| 878 << std::hex << evt->strreset_flags << " (" | |
| 879 << ListFlags(evt->strreset_flags) << ")"; | |
| 880 LOG(LS_VERBOSE) << "Assoc = " << evt->strreset_assoc_id << ", Streams = [" | |
| 881 << ListArray(evt->strreset_stream_list, num_ssrcs) | |
| 882 << "], Open: [" | |
| 883 << ListStreams(open_streams_) << "], Q'd: [" | |
| 884 << ListStreams(queued_reset_streams_) << "], Sent: [" | |
| 885 << ListStreams(sent_reset_streams_) << "]"; | |
| 886 | |
| 887 // If both sides try to reset some streams at the same time (even if they're | |
| 888 // disjoint sets), we can get reset failures. | |
| 889 if (evt->strreset_flags & SCTP_STREAM_RESET_FAILED) { | |
| 890 // OK, just try again. The stream IDs sent over when the RESET_FAILED flag | |
| 891 // is set seem to be garbage values. Ignore them. | |
| 892 queued_reset_streams_.insert( | |
| 893 sent_reset_streams_.begin(), | |
| 894 sent_reset_streams_.end()); | |
| 895 sent_reset_streams_.clear(); | |
| 896 | |
| 897 } else if (evt->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) { | |
| 898 // Each side gets an event for each direction of a stream. That is, | |
| 899 // closing sid k will make each side receive INCOMING and OUTGOING reset | |
| 900 // events for k. As per RFC6525, Section 5, paragraph 2, each side will | |
| 901 // get an INCOMING event first. | |
| 902 for (int i = 0; i < num_ssrcs; i++) { | |
| 903 const int stream_id = evt->strreset_stream_list[i]; | |
| 904 | |
| 905 // See if this stream ID was closed by our peer or ourselves. | |
| 906 StreamSet::iterator it = sent_reset_streams_.find(stream_id); | |
| 907 | |
| 908 // The reset was requested locally. | |
| 909 if (it != sent_reset_streams_.end()) { | |
| 910 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_ | |
| 911 << "): local sid " << stream_id << " acknowledged."; | |
| 912 sent_reset_streams_.erase(it); | |
| 913 | |
| 914 } else if ((it = open_streams_.find(stream_id)) | |
| 915 != open_streams_.end()) { | |
| 916 // The peer requested the reset. | |
| 917 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_ | |
| 918 << "): closing sid " << stream_id; | |
| 919 open_streams_.erase(it); | |
| 920 SignalStreamClosedRemotely(stream_id); | |
| 921 | |
| 922 } else if ((it = queued_reset_streams_.find(stream_id)) | |
| 923 != queued_reset_streams_.end()) { | |
| 924 // The peer requested the reset, but there was a local reset | |
| 925 // queued. | |
| 926 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_ | |
| 927 << "): double-sided close for sid " << stream_id; | |
| 928 // Both sides want the stream closed, and the peer got to send the | |
| 929 // RE-CONFIG first. Treat it like the local Remove(Send|Recv)Stream | |
| 930 // finished quickly. | |
| 931 queued_reset_streams_.erase(it); | |
| 932 | |
| 933 } else { | |
| 934 // This stream is unknown. Sometimes this can be from an | |
| 935 // RESET_FAILED-related retransmit. | |
| 936 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_ | |
| 937 << "): Unknown sid " << stream_id; | |
| 938 } | |
| 939 } | |
| 940 } | |
| 941 | |
| 942 // Always try to send the queued RESET because this call indicates that the | |
| 943 // last local RESET or remote RESET has made some progress. | |
| 944 SendQueuedStreamResets(); | |
| 945 } | |
| 946 | |
| 947 // Puts the specified |param| from the codec identified by |id| into |dest| | |
| 948 // and returns true. Or returns false if it wasn't there, leaving |dest| | |
| 949 // untouched. | |
| 950 static bool GetCodecIntParameter(const std::vector<DataCodec>& codecs, | |
| 951 int id, const std::string& name, | |
| 952 const std::string& param, int* dest) { | |
| 953 std::string value; | |
| 954 Codec match_pattern; | |
| 955 match_pattern.id = id; | |
| 956 match_pattern.name = name; | |
| 957 for (size_t i = 0; i < codecs.size(); ++i) { | |
| 958 if (codecs[i].Matches(match_pattern)) { | |
| 959 if (codecs[i].GetParam(param, &value)) { | |
| 960 *dest = rtc::FromString<int>(value); | |
| 961 return true; | |
| 962 } | |
| 963 } | |
| 964 } | |
| 965 return false; | |
| 966 } | |
| 967 | |
| 968 bool SctpDataMediaChannel::SetSendCodecs(const std::vector<DataCodec>& codecs) { | |
| 969 return GetCodecIntParameter( | |
| 970 codecs, kGoogleSctpDataCodecId, kGoogleSctpDataCodecName, kCodecParamPort, | |
| 971 &remote_port_); | |
| 972 } | |
| 973 | |
| 974 bool SctpDataMediaChannel::SetRecvCodecs(const std::vector<DataCodec>& codecs) { | |
| 975 return GetCodecIntParameter( | |
| 976 codecs, kGoogleSctpDataCodecId, kGoogleSctpDataCodecName, kCodecParamPort, | |
| 977 &local_port_); | |
| 978 } | |
| 979 | |
| 980 void SctpDataMediaChannel::OnPacketFromSctpToNetwork( | |
| 981 rtc::Buffer* buffer) { | |
| 982 // usrsctp seems to interpret the MTU we give it strangely -- it seems to | |
| 983 // give us back packets bigger than that MTU, if only by a fixed amount. | |
| 984 // This is that amount that we've observed. | |
| 985 const int kSctpOverhead = 76; | |
| 986 if (buffer->size() > (kSctpOverhead + kSctpMtu)) { | |
| 987 LOG(LS_ERROR) << debug_name_ << "->OnPacketFromSctpToNetwork(...): " | |
| 988 << "SCTP seems to have made a packet that is bigger " | |
| 989 << "than its official MTU: " << buffer->size() | |
| 990 << " vs max of " << kSctpMtu | |
| 991 << " even after adding " << kSctpOverhead | |
| 992 << " extra SCTP overhead"; | |
| 993 } | |
| 994 MediaChannel::SendPacket(buffer, rtc::PacketOptions()); | |
| 995 } | |
| 996 | |
| 997 bool SctpDataMediaChannel::SendQueuedStreamResets() { | |
| 998 if (!sent_reset_streams_.empty() || queued_reset_streams_.empty()) | |
| 999 return true; | |
| 1000 | |
| 1001 LOG(LS_VERBOSE) << "SendQueuedStreamResets[" << debug_name_ << "]: Sending [" | |
| 1002 << ListStreams(queued_reset_streams_) << "], Open: [" | |
| 1003 << ListStreams(open_streams_) << "], Sent: [" | |
| 1004 << ListStreams(sent_reset_streams_) << "]"; | |
| 1005 | |
| 1006 const size_t num_streams = queued_reset_streams_.size(); | |
| 1007 const size_t num_bytes = | |
| 1008 sizeof(struct sctp_reset_streams) + (num_streams * sizeof(uint16_t)); | |
| 1009 | |
| 1010 std::vector<uint8_t> reset_stream_buf(num_bytes, 0); | |
| 1011 struct sctp_reset_streams* resetp = reinterpret_cast<sctp_reset_streams*>( | |
| 1012 &reset_stream_buf[0]); | |
| 1013 resetp->srs_assoc_id = SCTP_ALL_ASSOC; | |
| 1014 resetp->srs_flags = SCTP_STREAM_RESET_INCOMING | SCTP_STREAM_RESET_OUTGOING; | |
| 1015 resetp->srs_number_streams = rtc::checked_cast<uint16_t>(num_streams); | |
| 1016 int result_idx = 0; | |
| 1017 for (StreamSet::iterator it = queued_reset_streams_.begin(); | |
| 1018 it != queued_reset_streams_.end(); ++it) { | |
| 1019 resetp->srs_stream_list[result_idx++] = *it; | |
| 1020 } | |
| 1021 | |
| 1022 int ret = usrsctp_setsockopt( | |
| 1023 sock_, IPPROTO_SCTP, SCTP_RESET_STREAMS, resetp, | |
| 1024 rtc::checked_cast<socklen_t>(reset_stream_buf.size())); | |
| 1025 if (ret < 0) { | |
| 1026 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to send a stream reset for " | |
| 1027 << num_streams << " streams"; | |
| 1028 return false; | |
| 1029 } | |
| 1030 | |
| 1031 // sent_reset_streams_ is empty, and all the queued_reset_streams_ go into | |
| 1032 // it now. | |
| 1033 queued_reset_streams_.swap(sent_reset_streams_); | |
| 1034 return true; | |
| 1035 } | |
| 1036 | |
| 1037 void SctpDataMediaChannel::OnMessage(rtc::Message* msg) { | |
| 1038 switch (msg->message_id) { | |
| 1039 case MSG_SCTPINBOUNDPACKET: { | |
| 1040 rtc::scoped_ptr<InboundPacketMessage> pdata( | |
| 1041 static_cast<InboundPacketMessage*>(msg->pdata)); | |
| 1042 OnInboundPacketFromSctpToChannel(pdata->data().get()); | |
| 1043 break; | |
| 1044 } | |
| 1045 case MSG_SCTPOUTBOUNDPACKET: { | |
| 1046 rtc::scoped_ptr<OutboundPacketMessage> pdata( | |
| 1047 static_cast<OutboundPacketMessage*>(msg->pdata)); | |
| 1048 OnPacketFromSctpToNetwork(pdata->data().get()); | |
| 1049 break; | |
| 1050 } | |
| 1051 } | |
| 1052 } | |
| 1053 } // namespace cricket | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1587193006:
Move talk/media to webrtc/media (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master