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Side by Side Diff: webrtc/media/sctp/sctpdataengine.cc

Issue 2614813003: Revert of Separating SCTP code from BaseChannel/MediaChannel. (Closed)
Patch Set: Also reverting https://codereview.webrtc.org/2612963002 Created 3 years, 11 months ago
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1 /*
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "webrtc/media/sctp/sctpdataengine.h"
12
13 #include <stdarg.h>
14 #include <stdio.h>
15
16 #include <memory>
17 #include <sstream>
18 #include <vector>
19
20 #include "usrsctplib/usrsctp.h"
21 #include "webrtc/base/arraysize.h"
22 #include "webrtc/base/copyonwritebuffer.h"
23 #include "webrtc/base/criticalsection.h"
24 #include "webrtc/base/helpers.h"
25 #include "webrtc/base/logging.h"
26 #include "webrtc/base/safe_conversions.h"
27 #include "webrtc/media/base/codec.h"
28 #include "webrtc/media/base/mediaconstants.h"
29 #include "webrtc/media/base/streamparams.h"
30
31 namespace cricket {
32 // The biggest SCTP packet. Starting from a 'safe' wire MTU value of 1280,
33 // take off 80 bytes for DTLS/TURN/TCP/IP overhead.
34 static constexpr size_t kSctpMtu = 1200;
35
36 // The size of the SCTP association send buffer. 256kB, the usrsctp default.
37 static constexpr int kSendBufferSize = 262144;
38
39 struct SctpInboundPacket {
40 rtc::CopyOnWriteBuffer buffer;
41 ReceiveDataParams params;
42 // The |flags| parameter is used by SCTP to distinguish notification packets
43 // from other types of packets.
44 int flags;
45 };
46
47 namespace {
48 // Set the initial value of the static SCTP Data Engines reference count.
49 int g_usrsctp_usage_count = 0;
50 rtc::GlobalLockPod g_usrsctp_lock_;
51
52 typedef SctpDataMediaChannel::StreamSet StreamSet;
53
54 // Returns a comma-separated, human-readable list of the stream IDs in 's'
55 std::string ListStreams(const StreamSet& s) {
56 std::stringstream result;
57 bool first = true;
58 for (StreamSet::const_iterator it = s.begin(); it != s.end(); ++it) {
59 if (!first) {
60 result << ", " << *it;
61 } else {
62 result << *it;
63 first = false;
64 }
65 }
66 return result.str();
67 }
68
69 // Returns a pipe-separated, human-readable list of the SCTP_STREAM_RESET
70 // flags in 'flags'
71 std::string ListFlags(int flags) {
72 std::stringstream result;
73 bool first = true;
74 // Skip past the first 12 chars (strlen("SCTP_STREAM_"))
75 #define MAKEFLAG(X) { X, #X + 12}
76 struct flaginfo_t {
77 int value;
78 const char* name;
79 } flaginfo[] = {
80 MAKEFLAG(SCTP_STREAM_RESET_INCOMING_SSN),
81 MAKEFLAG(SCTP_STREAM_RESET_OUTGOING_SSN),
82 MAKEFLAG(SCTP_STREAM_RESET_DENIED),
83 MAKEFLAG(SCTP_STREAM_RESET_FAILED),
84 MAKEFLAG(SCTP_STREAM_CHANGE_DENIED)
85 };
86 #undef MAKEFLAG
87 for (uint32_t i = 0; i < arraysize(flaginfo); ++i) {
88 if (flags & flaginfo[i].value) {
89 if (!first) result << " | ";
90 result << flaginfo[i].name;
91 first = false;
92 }
93 }
94 return result.str();
95 }
96
97 // Returns a comma-separated, human-readable list of the integers in 'array'.
98 // All 'num_elems' of them.
99 std::string ListArray(const uint16_t* array, int num_elems) {
100 std::stringstream result;
101 for (int i = 0; i < num_elems; ++i) {
102 if (i) {
103 result << ", " << array[i];
104 } else {
105 result << array[i];
106 }
107 }
108 return result.str();
109 }
110
111 typedef rtc::ScopedMessageData<SctpInboundPacket> InboundPacketMessage;
112 typedef rtc::ScopedMessageData<rtc::CopyOnWriteBuffer> OutboundPacketMessage;
113
114 enum {
115 MSG_SCTPINBOUNDPACKET = 1, // MessageData is SctpInboundPacket
116 MSG_SCTPOUTBOUNDPACKET = 2, // MessageData is rtc:Buffer
117 };
118
119 // Helper for logging SCTP messages.
120 void DebugSctpPrintf(const char* format, ...) {
121 #if RTC_DCHECK_IS_ON
122 char s[255];
123 va_list ap;
124 va_start(ap, format);
125 vsnprintf(s, sizeof(s), format, ap);
126 LOG(LS_INFO) << "SCTP: " << s;
127 va_end(ap);
128 #endif
129 }
130
131 // Get the PPID to use for the terminating fragment of this type.
132 SctpDataMediaChannel::PayloadProtocolIdentifier GetPpid(DataMessageType type) {
133 switch (type) {
134 default:
135 case DMT_NONE:
136 return SctpDataMediaChannel::PPID_NONE;
137 case DMT_CONTROL:
138 return SctpDataMediaChannel::PPID_CONTROL;
139 case DMT_BINARY:
140 return SctpDataMediaChannel::PPID_BINARY_LAST;
141 case DMT_TEXT:
142 return SctpDataMediaChannel::PPID_TEXT_LAST;
143 };
144 }
145
146 bool GetDataMediaType(SctpDataMediaChannel::PayloadProtocolIdentifier ppid,
147 DataMessageType* dest) {
148 ASSERT(dest != NULL);
149 switch (ppid) {
150 case SctpDataMediaChannel::PPID_BINARY_PARTIAL:
151 case SctpDataMediaChannel::PPID_BINARY_LAST:
152 *dest = DMT_BINARY;
153 return true;
154
155 case SctpDataMediaChannel::PPID_TEXT_PARTIAL:
156 case SctpDataMediaChannel::PPID_TEXT_LAST:
157 *dest = DMT_TEXT;
158 return true;
159
160 case SctpDataMediaChannel::PPID_CONTROL:
161 *dest = DMT_CONTROL;
162 return true;
163
164 case SctpDataMediaChannel::PPID_NONE:
165 *dest = DMT_NONE;
166 return true;
167
168 default:
169 return false;
170 }
171 }
172
173 // Log the packet in text2pcap format, if log level is at LS_VERBOSE.
174 void VerboseLogPacket(const void* data, size_t length, int direction) {
175 if (LOG_CHECK_LEVEL(LS_VERBOSE) && length > 0) {
176 char *dump_buf;
177 // Some downstream project uses an older version of usrsctp that expects
178 // a non-const "void*" as first parameter when dumping the packet, so we
179 // need to cast the const away here to avoid a compiler error.
180 if ((dump_buf = usrsctp_dumppacket(
181 const_cast<void*>(data), length, direction)) != NULL) {
182 LOG(LS_VERBOSE) << dump_buf;
183 usrsctp_freedumpbuffer(dump_buf);
184 }
185 }
186 }
187
188 // This is the callback usrsctp uses when there's data to send on the network
189 // that has been wrapped appropriatly for the SCTP protocol.
190 int OnSctpOutboundPacket(void* addr,
191 void* data,
192 size_t length,
193 uint8_t tos,
194 uint8_t set_df) {
195 SctpDataMediaChannel* channel = static_cast<SctpDataMediaChannel*>(addr);
196 LOG(LS_VERBOSE) << "global OnSctpOutboundPacket():"
197 << "addr: " << addr << "; length: " << length
198 << "; tos: " << std::hex << static_cast<int>(tos)
199 << "; set_df: " << std::hex << static_cast<int>(set_df);
200
201 VerboseLogPacket(data, length, SCTP_DUMP_OUTBOUND);
202 // Note: We have to copy the data; the caller will delete it.
203 auto* msg = new OutboundPacketMessage(
204 new rtc::CopyOnWriteBuffer(reinterpret_cast<uint8_t*>(data), length));
205 channel->worker_thread()->Post(RTC_FROM_HERE, channel, MSG_SCTPOUTBOUNDPACKET,
206 msg);
207 return 0;
208 }
209
210 // This is the callback called from usrsctp when data has been received, after
211 // a packet has been interpreted and parsed by usrsctp and found to contain
212 // payload data. It is called by a usrsctp thread. It is assumed this function
213 // will free the memory used by 'data'.
214 int OnSctpInboundPacket(struct socket* sock,
215 union sctp_sockstore addr,
216 void* data,
217 size_t length,
218 struct sctp_rcvinfo rcv,
219 int flags,
220 void* ulp_info) {
221 SctpDataMediaChannel* channel = static_cast<SctpDataMediaChannel*>(ulp_info);
222 // Post data to the channel's receiver thread (copying it).
223 // TODO(ldixon): Unclear if copy is needed as this method is responsible for
224 // memory cleanup. But this does simplify code.
225 const SctpDataMediaChannel::PayloadProtocolIdentifier ppid =
226 static_cast<SctpDataMediaChannel::PayloadProtocolIdentifier>(
227 rtc::HostToNetwork32(rcv.rcv_ppid));
228 DataMessageType type = DMT_NONE;
229 if (!GetDataMediaType(ppid, &type) && !(flags & MSG_NOTIFICATION)) {
230 // It's neither a notification nor a recognized data packet. Drop it.
231 LOG(LS_ERROR) << "Received an unknown PPID " << ppid
232 << " on an SCTP packet. Dropping.";
233 } else {
234 SctpInboundPacket* packet = new SctpInboundPacket;
235 packet->buffer.SetData(reinterpret_cast<uint8_t*>(data), length);
236 packet->params.ssrc = rcv.rcv_sid;
237 packet->params.seq_num = rcv.rcv_ssn;
238 packet->params.timestamp = rcv.rcv_tsn;
239 packet->params.type = type;
240 packet->flags = flags;
241 // The ownership of |packet| transfers to |msg|.
242 InboundPacketMessage* msg = new InboundPacketMessage(packet);
243 channel->worker_thread()->Post(RTC_FROM_HERE, channel,
244 MSG_SCTPINBOUNDPACKET, msg);
245 }
246 free(data);
247 return 1;
248 }
249
250 void InitializeUsrSctp() {
251 LOG(LS_INFO) << __FUNCTION__;
252 // First argument is udp_encapsulation_port, which is not releveant for our
253 // AF_CONN use of sctp.
254 usrsctp_init(0, &OnSctpOutboundPacket, &DebugSctpPrintf);
255
256 // To turn on/off detailed SCTP debugging. You will also need to have the
257 // SCTP_DEBUG cpp defines flag.
258 // usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_ALL);
259
260 // TODO(ldixon): Consider turning this on/off.
261 usrsctp_sysctl_set_sctp_ecn_enable(0);
262
263 // This is harmless, but we should find out when the library default
264 // changes.
265 int send_size = usrsctp_sysctl_get_sctp_sendspace();
266 if (send_size != kSendBufferSize) {
267 LOG(LS_ERROR) << "Got different send size than expected: " << send_size;
268 }
269
270 // TODO(ldixon): Consider turning this on/off.
271 // This is not needed right now (we don't do dynamic address changes):
272 // If SCTP Auto-ASCONF is enabled, the peer is informed automatically
273 // when a new address is added or removed. This feature is enabled by
274 // default.
275 // usrsctp_sysctl_set_sctp_auto_asconf(0);
276
277 // TODO(ldixon): Consider turning this on/off.
278 // Add a blackhole sysctl. Setting it to 1 results in no ABORTs
279 // being sent in response to INITs, setting it to 2 results
280 // in no ABORTs being sent for received OOTB packets.
281 // This is similar to the TCP sysctl.
282 //
283 // See: http://lakerest.net/pipermail/sctp-coders/2012-January/009438.html
284 // See: http://svnweb.freebsd.org/base?view=revision&revision=229805
285 // usrsctp_sysctl_set_sctp_blackhole(2);
286
287 // Set the number of default outgoing streams. This is the number we'll
288 // send in the SCTP INIT message.
289 usrsctp_sysctl_set_sctp_nr_outgoing_streams_default(kMaxSctpStreams);
290 }
291
292 void UninitializeUsrSctp() {
293 LOG(LS_INFO) << __FUNCTION__;
294 // usrsctp_finish() may fail if it's called too soon after the channels are
295 // closed. Wait and try again until it succeeds for up to 3 seconds.
296 for (size_t i = 0; i < 300; ++i) {
297 if (usrsctp_finish() == 0) {
298 return;
299 }
300
301 rtc::Thread::SleepMs(10);
302 }
303 LOG(LS_ERROR) << "Failed to shutdown usrsctp.";
304 }
305
306 void IncrementUsrSctpUsageCount() {
307 rtc::GlobalLockScope lock(&g_usrsctp_lock_);
308 if (!g_usrsctp_usage_count) {
309 InitializeUsrSctp();
310 }
311 ++g_usrsctp_usage_count;
312 }
313
314 void DecrementUsrSctpUsageCount() {
315 rtc::GlobalLockScope lock(&g_usrsctp_lock_);
316 --g_usrsctp_usage_count;
317 if (!g_usrsctp_usage_count) {
318 UninitializeUsrSctp();
319 }
320 }
321
322 DataCodec GetSctpDataCodec() {
323 DataCodec codec(kGoogleSctpDataCodecPlType, kGoogleSctpDataCodecName);
324 codec.SetParam(kCodecParamPort, kSctpDefaultPort);
325 return codec;
326 }
327
328 } // namespace
329
330 SctpDataEngine::SctpDataEngine() : codecs_(1, GetSctpDataCodec()) {}
331
332 SctpDataEngine::~SctpDataEngine() {}
333
334 // Called on the worker thread.
335 DataMediaChannel* SctpDataEngine::CreateChannel(
336 DataChannelType data_channel_type,
337 const MediaConfig& config) {
338 if (data_channel_type != DCT_SCTP) {
339 return NULL;
340 }
341 return new SctpDataMediaChannel(rtc::Thread::Current(), config);
342 }
343
344 // static
345 SctpDataMediaChannel* SctpDataMediaChannel::GetChannelFromSocket(
346 struct socket* sock) {
347 struct sockaddr* addrs = nullptr;
348 int naddrs = usrsctp_getladdrs(sock, 0, &addrs);
349 if (naddrs <= 0 || addrs[0].sa_family != AF_CONN) {
350 return nullptr;
351 }
352 // usrsctp_getladdrs() returns the addresses bound to this socket, which
353 // contains the SctpDataMediaChannel* as sconn_addr. Read the pointer,
354 // then free the list of addresses once we have the pointer. We only open
355 // AF_CONN sockets, and they should all have the sconn_addr set to the
356 // pointer that created them, so [0] is as good as any other.
357 struct sockaddr_conn* sconn =
358 reinterpret_cast<struct sockaddr_conn*>(&addrs[0]);
359 SctpDataMediaChannel* channel =
360 reinterpret_cast<SctpDataMediaChannel*>(sconn->sconn_addr);
361 usrsctp_freeladdrs(addrs);
362
363 return channel;
364 }
365
366 // static
367 int SctpDataMediaChannel::SendThresholdCallback(struct socket* sock,
368 uint32_t sb_free) {
369 // Fired on our I/O thread. SctpDataMediaChannel::OnPacketReceived() gets
370 // a packet containing acknowledgments, which goes into usrsctp_conninput,
371 // and then back here.
372 SctpDataMediaChannel* channel = GetChannelFromSocket(sock);
373 if (!channel) {
374 LOG(LS_ERROR) << "SendThresholdCallback: Failed to get channel for socket "
375 << sock;
376 return 0;
377 }
378 channel->OnSendThresholdCallback();
379 return 0;
380 }
381
382 SctpDataMediaChannel::SctpDataMediaChannel(rtc::Thread* thread,
383 const MediaConfig& config)
384 : DataMediaChannel(config),
385 worker_thread_(thread),
386 local_port_(kSctpDefaultPort),
387 remote_port_(kSctpDefaultPort),
388 sock_(NULL),
389 sending_(false),
390 receiving_(false),
391 debug_name_("SctpDataMediaChannel") {}
392
393 SctpDataMediaChannel::~SctpDataMediaChannel() {
394 CloseSctpSocket();
395 }
396
397 void SctpDataMediaChannel::OnSendThresholdCallback() {
398 RTC_DCHECK(rtc::Thread::Current() == worker_thread_);
399 SignalReadyToSend(true);
400 }
401
402 sockaddr_conn SctpDataMediaChannel::GetSctpSockAddr(int port) {
403 sockaddr_conn sconn = {0};
404 sconn.sconn_family = AF_CONN;
405 #ifdef HAVE_SCONN_LEN
406 sconn.sconn_len = sizeof(sockaddr_conn);
407 #endif
408 // Note: conversion from int to uint16_t happens here.
409 sconn.sconn_port = rtc::HostToNetwork16(port);
410 sconn.sconn_addr = this;
411 return sconn;
412 }
413
414 bool SctpDataMediaChannel::OpenSctpSocket() {
415 if (sock_) {
416 LOG(LS_VERBOSE) << debug_name_
417 << "->Ignoring attempt to re-create existing socket.";
418 return false;
419 }
420
421 IncrementUsrSctpUsageCount();
422
423 // If kSendBufferSize isn't reflective of reality, we log an error, but we
424 // still have to do something reasonable here. Look up what the buffer's
425 // real size is and set our threshold to something reasonable.
426 const static int kSendThreshold = usrsctp_sysctl_get_sctp_sendspace() / 2;
427
428 sock_ = usrsctp_socket(
429 AF_CONN, SOCK_STREAM, IPPROTO_SCTP, OnSctpInboundPacket,
430 &SctpDataMediaChannel::SendThresholdCallback, kSendThreshold, this);
431 if (!sock_) {
432 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to create SCTP socket.";
433 DecrementUsrSctpUsageCount();
434 return false;
435 }
436
437 // Make the socket non-blocking. Connect, close, shutdown etc will not block
438 // the thread waiting for the socket operation to complete.
439 if (usrsctp_set_non_blocking(sock_, 1) < 0) {
440 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP to non blocking.";
441 return false;
442 }
443
444 // This ensures that the usrsctp close call deletes the association. This
445 // prevents usrsctp from calling OnSctpOutboundPacket with references to
446 // this class as the address.
447 linger linger_opt;
448 linger_opt.l_onoff = 1;
449 linger_opt.l_linger = 0;
450 if (usrsctp_setsockopt(sock_, SOL_SOCKET, SO_LINGER, &linger_opt,
451 sizeof(linger_opt))) {
452 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SO_LINGER.";
453 return false;
454 }
455
456 // Enable stream ID resets.
457 struct sctp_assoc_value stream_rst;
458 stream_rst.assoc_id = SCTP_ALL_ASSOC;
459 stream_rst.assoc_value = 1;
460 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET,
461 &stream_rst, sizeof(stream_rst))) {
462 LOG_ERRNO(LS_ERROR) << debug_name_
463 << "Failed to set SCTP_ENABLE_STREAM_RESET.";
464 return false;
465 }
466
467 // Nagle.
468 uint32_t nodelay = 1;
469 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_NODELAY, &nodelay,
470 sizeof(nodelay))) {
471 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP_NODELAY.";
472 return false;
473 }
474
475 // Subscribe to SCTP event notifications.
476 int event_types[] = {SCTP_ASSOC_CHANGE,
477 SCTP_PEER_ADDR_CHANGE,
478 SCTP_SEND_FAILED_EVENT,
479 SCTP_SENDER_DRY_EVENT,
480 SCTP_STREAM_RESET_EVENT};
481 struct sctp_event event = {0};
482 event.se_assoc_id = SCTP_ALL_ASSOC;
483 event.se_on = 1;
484 for (size_t i = 0; i < arraysize(event_types); i++) {
485 event.se_type = event_types[i];
486 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_EVENT, &event,
487 sizeof(event)) < 0) {
488 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to set SCTP_EVENT type: "
489 << event.se_type;
490 return false;
491 }
492 }
493
494 // Register this class as an address for usrsctp. This is used by SCTP to
495 // direct the packets received (by the created socket) to this class.
496 usrsctp_register_address(this);
497 sending_ = true;
498 return true;
499 }
500
501 void SctpDataMediaChannel::CloseSctpSocket() {
502 sending_ = false;
503 if (sock_) {
504 // We assume that SO_LINGER option is set to close the association when
505 // close is called. This means that any pending packets in usrsctp will be
506 // discarded instead of being sent.
507 usrsctp_close(sock_);
508 sock_ = NULL;
509 usrsctp_deregister_address(this);
510
511 DecrementUsrSctpUsageCount();
512 }
513 }
514
515 bool SctpDataMediaChannel::Connect() {
516 LOG(LS_VERBOSE) << debug_name_ << "->Connect().";
517
518 // If we already have a socket connection, just return.
519 if (sock_) {
520 LOG(LS_WARNING) << debug_name_ << "->Connect(): Ignored as socket "
521 "is already established.";
522 return true;
523 }
524
525 // If no socket (it was closed) try to start it again. This can happen when
526 // the socket we are connecting to closes, does an sctp shutdown handshake,
527 // or behaves unexpectedly causing us to perform a CloseSctpSocket.
528 if (!sock_ && !OpenSctpSocket()) {
529 return false;
530 }
531
532 // Note: conversion from int to uint16_t happens on assignment.
533 sockaddr_conn local_sconn = GetSctpSockAddr(local_port_);
534 if (usrsctp_bind(sock_, reinterpret_cast<sockaddr *>(&local_sconn),
535 sizeof(local_sconn)) < 0) {
536 LOG_ERRNO(LS_ERROR) << debug_name_ << "->Connect(): "
537 << ("Failed usrsctp_bind");
538 CloseSctpSocket();
539 return false;
540 }
541
542 // Note: conversion from int to uint16_t happens on assignment.
543 sockaddr_conn remote_sconn = GetSctpSockAddr(remote_port_);
544 int connect_result = usrsctp_connect(
545 sock_, reinterpret_cast<sockaddr *>(&remote_sconn), sizeof(remote_sconn));
546 if (connect_result < 0 && errno != SCTP_EINPROGRESS) {
547 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed usrsctp_connect. got errno="
548 << errno << ", but wanted " << SCTP_EINPROGRESS;
549 CloseSctpSocket();
550 return false;
551 }
552 // Set the MTU and disable MTU discovery.
553 // We can only do this after usrsctp_connect or it has no effect.
554 sctp_paddrparams params = {{0}};
555 memcpy(&params.spp_address, &remote_sconn, sizeof(remote_sconn));
556 params.spp_flags = SPP_PMTUD_DISABLE;
557 params.spp_pathmtu = kSctpMtu;
558 if (usrsctp_setsockopt(sock_, IPPROTO_SCTP, SCTP_PEER_ADDR_PARAMS, &params,
559 sizeof(params))) {
560 LOG_ERRNO(LS_ERROR) << debug_name_
561 << "Failed to set SCTP_PEER_ADDR_PARAMS.";
562 }
563 return true;
564 }
565
566 void SctpDataMediaChannel::Disconnect() {
567 // TODO(ldixon): Consider calling |usrsctp_shutdown(sock_, ...)| to do a
568 // shutdown handshake and remove the association.
569 CloseSctpSocket();
570 }
571
572 bool SctpDataMediaChannel::SetSend(bool send) {
573 if (!sending_ && send) {
574 return Connect();
575 }
576 if (sending_ && !send) {
577 Disconnect();
578 }
579 return true;
580 }
581
582 bool SctpDataMediaChannel::SetReceive(bool receive) {
583 receiving_ = receive;
584 return true;
585 }
586
587 bool SctpDataMediaChannel::SetSendParameters(const DataSendParameters& params) {
588 return SetSendCodecs(params.codecs);
589 }
590
591 bool SctpDataMediaChannel::SetRecvParameters(const DataRecvParameters& params) {
592 return SetRecvCodecs(params.codecs);
593 }
594
595 bool SctpDataMediaChannel::AddSendStream(const StreamParams& stream) {
596 return AddStream(stream);
597 }
598
599 bool SctpDataMediaChannel::RemoveSendStream(uint32_t ssrc) {
600 return ResetStream(ssrc);
601 }
602
603 bool SctpDataMediaChannel::AddRecvStream(const StreamParams& stream) {
604 // SCTP DataChannels are always bi-directional and calling AddSendStream will
605 // enable both sending and receiving on the stream. So AddRecvStream is a
606 // no-op.
607 return true;
608 }
609
610 bool SctpDataMediaChannel::RemoveRecvStream(uint32_t ssrc) {
611 // SCTP DataChannels are always bi-directional and calling RemoveSendStream
612 // will disable both sending and receiving on the stream. So RemoveRecvStream
613 // is a no-op.
614 return true;
615 }
616
617 bool SctpDataMediaChannel::SendData(
618 const SendDataParams& params,
619 const rtc::CopyOnWriteBuffer& payload,
620 SendDataResult* result) {
621 if (result) {
622 // Preset |result| to assume an error. If SendData succeeds, we'll
623 // overwrite |*result| once more at the end.
624 *result = SDR_ERROR;
625 }
626
627 if (!sending_) {
628 LOG(LS_WARNING) << debug_name_ << "->SendData(...): "
629 << "Not sending packet with ssrc=" << params.ssrc
630 << " len=" << payload.size() << " before SetSend(true).";
631 return false;
632 }
633
634 if (params.type != DMT_CONTROL &&
635 open_streams_.find(params.ssrc) == open_streams_.end()) {
636 LOG(LS_WARNING) << debug_name_ << "->SendData(...): "
637 << "Not sending data because ssrc is unknown: "
638 << params.ssrc;
639 return false;
640 }
641
642 //
643 // Send data using SCTP.
644 ssize_t send_res = 0; // result from usrsctp_sendv.
645 struct sctp_sendv_spa spa = {0};
646 spa.sendv_flags |= SCTP_SEND_SNDINFO_VALID;
647 spa.sendv_sndinfo.snd_sid = params.ssrc;
648 spa.sendv_sndinfo.snd_ppid = rtc::HostToNetwork32(
649 GetPpid(params.type));
650
651 // Ordered implies reliable.
652 if (!params.ordered) {
653 spa.sendv_sndinfo.snd_flags |= SCTP_UNORDERED;
654 if (params.max_rtx_count >= 0 || params.max_rtx_ms == 0) {
655 spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
656 spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_RTX;
657 spa.sendv_prinfo.pr_value = params.max_rtx_count;
658 } else {
659 spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
660 spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_TTL;
661 spa.sendv_prinfo.pr_value = params.max_rtx_ms;
662 }
663 }
664
665 // We don't fragment.
666 send_res = usrsctp_sendv(
667 sock_, payload.data(), static_cast<size_t>(payload.size()), NULL, 0, &spa,
668 rtc::checked_cast<socklen_t>(sizeof(spa)), SCTP_SENDV_SPA, 0);
669 if (send_res < 0) {
670 if (errno == SCTP_EWOULDBLOCK) {
671 *result = SDR_BLOCK;
672 LOG(LS_INFO) << debug_name_ << "->SendData(...): EWOULDBLOCK returned";
673 } else {
674 LOG_ERRNO(LS_ERROR) << "ERROR:" << debug_name_
675 << "->SendData(...): "
676 << " usrsctp_sendv: ";
677 }
678 return false;
679 }
680 if (result) {
681 // Only way out now is success.
682 *result = SDR_SUCCESS;
683 }
684 return true;
685 }
686
687 // Called by network interface when a packet has been received.
688 void SctpDataMediaChannel::OnPacketReceived(
689 rtc::CopyOnWriteBuffer* packet, const rtc::PacketTime& packet_time) {
690 RTC_DCHECK(rtc::Thread::Current() == worker_thread_);
691 LOG(LS_VERBOSE) << debug_name_ << "->OnPacketReceived(...): "
692 << " length=" << packet->size() << ", sending: " << sending_;
693 // Only give receiving packets to usrsctp after if connected. This enables two
694 // peers to each make a connect call, but for them not to receive an INIT
695 // packet before they have called connect; least the last receiver of the INIT
696 // packet will have called connect, and a connection will be established.
697 if (sending_) {
698 // Pass received packet to SCTP stack. Once processed by usrsctp, the data
699 // will be will be given to the global OnSctpInboundData, and then,
700 // marshalled by a Post and handled with OnMessage.
701 VerboseLogPacket(packet->cdata(), packet->size(), SCTP_DUMP_INBOUND);
702 usrsctp_conninput(this, packet->cdata(), packet->size(), 0);
703 } else {
704 // TODO(ldixon): Consider caching the packet for very slightly better
705 // reliability.
706 }
707 }
708
709 void SctpDataMediaChannel::OnInboundPacketFromSctpToChannel(
710 SctpInboundPacket* packet) {
711 LOG(LS_VERBOSE) << debug_name_ << "->OnInboundPacketFromSctpToChannel(...): "
712 << "Received SCTP data:"
713 << " ssrc=" << packet->params.ssrc
714 << " notification: " << (packet->flags & MSG_NOTIFICATION)
715 << " length=" << packet->buffer.size();
716 // Sending a packet with data == NULL (no data) is SCTPs "close the
717 // connection" message. This sets sock_ = NULL;
718 if (!packet->buffer.size() || !packet->buffer.data()) {
719 LOG(LS_INFO) << debug_name_ << "->OnInboundPacketFromSctpToChannel(...): "
720 "No data, closing.";
721 return;
722 }
723 if (packet->flags & MSG_NOTIFICATION) {
724 OnNotificationFromSctp(packet->buffer);
725 } else {
726 OnDataFromSctpToChannel(packet->params, packet->buffer);
727 }
728 }
729
730 void SctpDataMediaChannel::OnDataFromSctpToChannel(
731 const ReceiveDataParams& params, const rtc::CopyOnWriteBuffer& buffer) {
732 if (receiving_) {
733 LOG(LS_VERBOSE) << debug_name_ << "->OnDataFromSctpToChannel(...): "
734 << "Posting with length: " << buffer.size()
735 << " on stream " << params.ssrc;
736 // Reports all received messages to upper layers, no matter whether the sid
737 // is known.
738 SignalDataReceived(params, buffer.data<char>(), buffer.size());
739 } else {
740 LOG(LS_WARNING) << debug_name_ << "->OnDataFromSctpToChannel(...): "
741 << "Not receiving packet with sid=" << params.ssrc
742 << " len=" << buffer.size() << " before SetReceive(true).";
743 }
744 }
745
746 bool SctpDataMediaChannel::AddStream(const StreamParams& stream) {
747 if (!stream.has_ssrcs()) {
748 return false;
749 }
750
751 const uint32_t ssrc = stream.first_ssrc();
752 if (ssrc > kMaxSctpSid) {
753 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): "
754 << "Not adding data stream '" << stream.id
755 << "' with sid=" << ssrc << " because sid is too high.";
756 return false;
757 } else if (open_streams_.find(ssrc) != open_streams_.end()) {
758 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): "
759 << "Not adding data stream '" << stream.id
760 << "' with sid=" << ssrc
761 << " because stream is already open.";
762 return false;
763 } else if (queued_reset_streams_.find(ssrc) != queued_reset_streams_.end()
764 || sent_reset_streams_.find(ssrc) != sent_reset_streams_.end()) {
765 LOG(LS_WARNING) << debug_name_ << "->Add(Send|Recv)Stream(...): "
766 << "Not adding data stream '" << stream.id
767 << "' with sid=" << ssrc
768 << " because stream is still closing.";
769 return false;
770 }
771
772 open_streams_.insert(ssrc);
773 return true;
774 }
775
776 bool SctpDataMediaChannel::ResetStream(uint32_t ssrc) {
777 // We typically get this called twice for the same stream, once each for
778 // Send and Recv.
779 StreamSet::iterator found = open_streams_.find(ssrc);
780
781 if (found == open_streams_.end()) {
782 LOG(LS_VERBOSE) << debug_name_ << "->ResetStream(" << ssrc << "): "
783 << "stream not found.";
784 return false;
785 } else {
786 LOG(LS_VERBOSE) << debug_name_ << "->ResetStream(" << ssrc << "): "
787 << "Removing and queuing RE-CONFIG chunk.";
788 open_streams_.erase(found);
789 }
790
791 // SCTP won't let you have more than one stream reset pending at a time, but
792 // you can close multiple streams in a single reset. So, we keep an internal
793 // queue of streams-to-reset, and send them as one reset message in
794 // SendQueuedStreamResets().
795 queued_reset_streams_.insert(ssrc);
796
797 // Signal our stream-reset logic that it should try to send now, if it can.
798 SendQueuedStreamResets();
799
800 // The stream will actually get removed when we get the acknowledgment.
801 return true;
802 }
803
804 void SctpDataMediaChannel::OnNotificationFromSctp(
805 const rtc::CopyOnWriteBuffer& buffer) {
806 const sctp_notification& notification =
807 reinterpret_cast<const sctp_notification&>(*buffer.data());
808 ASSERT(notification.sn_header.sn_length == buffer.size());
809
810 // TODO(ldixon): handle notifications appropriately.
811 switch (notification.sn_header.sn_type) {
812 case SCTP_ASSOC_CHANGE:
813 LOG(LS_VERBOSE) << "SCTP_ASSOC_CHANGE";
814 OnNotificationAssocChange(notification.sn_assoc_change);
815 break;
816 case SCTP_REMOTE_ERROR:
817 LOG(LS_INFO) << "SCTP_REMOTE_ERROR";
818 break;
819 case SCTP_SHUTDOWN_EVENT:
820 LOG(LS_INFO) << "SCTP_SHUTDOWN_EVENT";
821 break;
822 case SCTP_ADAPTATION_INDICATION:
823 LOG(LS_INFO) << "SCTP_ADAPTATION_INDICATION";
824 break;
825 case SCTP_PARTIAL_DELIVERY_EVENT:
826 LOG(LS_INFO) << "SCTP_PARTIAL_DELIVERY_EVENT";
827 break;
828 case SCTP_AUTHENTICATION_EVENT:
829 LOG(LS_INFO) << "SCTP_AUTHENTICATION_EVENT";
830 break;
831 case SCTP_SENDER_DRY_EVENT:
832 LOG(LS_VERBOSE) << "SCTP_SENDER_DRY_EVENT";
833 SignalReadyToSend(true);
834 break;
835 // TODO(ldixon): Unblock after congestion.
836 case SCTP_NOTIFICATIONS_STOPPED_EVENT:
837 LOG(LS_INFO) << "SCTP_NOTIFICATIONS_STOPPED_EVENT";
838 break;
839 case SCTP_SEND_FAILED_EVENT:
840 LOG(LS_INFO) << "SCTP_SEND_FAILED_EVENT";
841 break;
842 case SCTP_STREAM_RESET_EVENT:
843 OnStreamResetEvent(&notification.sn_strreset_event);
844 break;
845 case SCTP_ASSOC_RESET_EVENT:
846 LOG(LS_INFO) << "SCTP_ASSOC_RESET_EVENT";
847 break;
848 case SCTP_STREAM_CHANGE_EVENT:
849 LOG(LS_INFO) << "SCTP_STREAM_CHANGE_EVENT";
850 // An acknowledgment we get after our stream resets have gone through,
851 // if they've failed. We log the message, but don't react -- we don't
852 // keep around the last-transmitted set of SSIDs we wanted to close for
853 // error recovery. It doesn't seem likely to occur, and if so, likely
854 // harmless within the lifetime of a single SCTP association.
855 break;
856 default:
857 LOG(LS_WARNING) << "Unknown SCTP event: "
858 << notification.sn_header.sn_type;
859 break;
860 }
861 }
862
863 void SctpDataMediaChannel::OnNotificationAssocChange(
864 const sctp_assoc_change& change) {
865 switch (change.sac_state) {
866 case SCTP_COMM_UP:
867 LOG(LS_VERBOSE) << "Association change SCTP_COMM_UP";
868 break;
869 case SCTP_COMM_LOST:
870 LOG(LS_INFO) << "Association change SCTP_COMM_LOST";
871 break;
872 case SCTP_RESTART:
873 LOG(LS_INFO) << "Association change SCTP_RESTART";
874 break;
875 case SCTP_SHUTDOWN_COMP:
876 LOG(LS_INFO) << "Association change SCTP_SHUTDOWN_COMP";
877 break;
878 case SCTP_CANT_STR_ASSOC:
879 LOG(LS_INFO) << "Association change SCTP_CANT_STR_ASSOC";
880 break;
881 default:
882 LOG(LS_INFO) << "Association change UNKNOWN";
883 break;
884 }
885 }
886
887 void SctpDataMediaChannel::OnStreamResetEvent(
888 const struct sctp_stream_reset_event* evt) {
889 // A stream reset always involves two RE-CONFIG chunks for us -- we always
890 // simultaneously reset a sid's sequence number in both directions. The
891 // requesting side transmits a RE-CONFIG chunk and waits for the peer to send
892 // one back. Both sides get this SCTP_STREAM_RESET_EVENT when they receive
893 // RE-CONFIGs.
894 const int num_ssrcs = (evt->strreset_length - sizeof(*evt)) /
895 sizeof(evt->strreset_stream_list[0]);
896 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_
897 << "): Flags = 0x"
898 << std::hex << evt->strreset_flags << " ("
899 << ListFlags(evt->strreset_flags) << ")";
900 LOG(LS_VERBOSE) << "Assoc = " << evt->strreset_assoc_id << ", Streams = ["
901 << ListArray(evt->strreset_stream_list, num_ssrcs)
902 << "], Open: ["
903 << ListStreams(open_streams_) << "], Q'd: ["
904 << ListStreams(queued_reset_streams_) << "], Sent: ["
905 << ListStreams(sent_reset_streams_) << "]";
906
907 // If both sides try to reset some streams at the same time (even if they're
908 // disjoint sets), we can get reset failures.
909 if (evt->strreset_flags & SCTP_STREAM_RESET_FAILED) {
910 // OK, just try again. The stream IDs sent over when the RESET_FAILED flag
911 // is set seem to be garbage values. Ignore them.
912 queued_reset_streams_.insert(
913 sent_reset_streams_.begin(),
914 sent_reset_streams_.end());
915 sent_reset_streams_.clear();
916
917 } else if (evt->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
918 // Each side gets an event for each direction of a stream. That is,
919 // closing sid k will make each side receive INCOMING and OUTGOING reset
920 // events for k. As per RFC6525, Section 5, paragraph 2, each side will
921 // get an INCOMING event first.
922 for (int i = 0; i < num_ssrcs; i++) {
923 const int stream_id = evt->strreset_stream_list[i];
924
925 // See if this stream ID was closed by our peer or ourselves.
926 StreamSet::iterator it = sent_reset_streams_.find(stream_id);
927
928 // The reset was requested locally.
929 if (it != sent_reset_streams_.end()) {
930 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_
931 << "): local sid " << stream_id << " acknowledged.";
932 sent_reset_streams_.erase(it);
933
934 } else if ((it = open_streams_.find(stream_id))
935 != open_streams_.end()) {
936 // The peer requested the reset.
937 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_
938 << "): closing sid " << stream_id;
939 open_streams_.erase(it);
940 SignalStreamClosedRemotely(stream_id);
941
942 } else if ((it = queued_reset_streams_.find(stream_id))
943 != queued_reset_streams_.end()) {
944 // The peer requested the reset, but there was a local reset
945 // queued.
946 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_
947 << "): double-sided close for sid " << stream_id;
948 // Both sides want the stream closed, and the peer got to send the
949 // RE-CONFIG first. Treat it like the local Remove(Send|Recv)Stream
950 // finished quickly.
951 queued_reset_streams_.erase(it);
952
953 } else {
954 // This stream is unknown. Sometimes this can be from an
955 // RESET_FAILED-related retransmit.
956 LOG(LS_VERBOSE) << "SCTP_STREAM_RESET_EVENT(" << debug_name_
957 << "): Unknown sid " << stream_id;
958 }
959 }
960 }
961
962 // Always try to send the queued RESET because this call indicates that the
963 // last local RESET or remote RESET has made some progress.
964 SendQueuedStreamResets();
965 }
966
967 // Puts the specified |param| from the codec identified by |id| into |dest|
968 // and returns true. Or returns false if it wasn't there, leaving |dest|
969 // untouched.
970 static bool GetCodecIntParameter(const std::vector<DataCodec>& codecs,
971 int id, const std::string& name,
972 const std::string& param, int* dest) {
973 std::string value;
974 DataCodec match_pattern(id, name);
975 for (size_t i = 0; i < codecs.size(); ++i) {
976 if (codecs[i].Matches(match_pattern)) {
977 if (codecs[i].GetParam(param, &value)) {
978 *dest = rtc::FromString<int>(value);
979 return true;
980 }
981 }
982 }
983 return false;
984 }
985
986 bool SctpDataMediaChannel::SetSendCodecs(const std::vector<DataCodec>& codecs) {
987 return GetCodecIntParameter(
988 codecs, kGoogleSctpDataCodecPlType, kGoogleSctpDataCodecName,
989 kCodecParamPort, &remote_port_);
990 }
991
992 bool SctpDataMediaChannel::SetRecvCodecs(const std::vector<DataCodec>& codecs) {
993 return GetCodecIntParameter(
994 codecs, kGoogleSctpDataCodecPlType, kGoogleSctpDataCodecName,
995 kCodecParamPort, &local_port_);
996 }
997
998 void SctpDataMediaChannel::OnPacketFromSctpToNetwork(
999 rtc::CopyOnWriteBuffer* buffer) {
1000 if (buffer->size() > (kSctpMtu)) {
1001 LOG(LS_ERROR) << debug_name_ << "->OnPacketFromSctpToNetwork(...): "
1002 << "SCTP seems to have made a packet that is bigger "
1003 << "than its official MTU: " << buffer->size()
1004 << " vs max of " << kSctpMtu;
1005 }
1006 MediaChannel::SendPacket(buffer, rtc::PacketOptions());
1007 }
1008
1009 bool SctpDataMediaChannel::SendQueuedStreamResets() {
1010 if (!sent_reset_streams_.empty() || queued_reset_streams_.empty()) {
1011 return true;
1012 }
1013
1014 LOG(LS_VERBOSE) << "SendQueuedStreamResets[" << debug_name_ << "]: Sending ["
1015 << ListStreams(queued_reset_streams_) << "], Open: ["
1016 << ListStreams(open_streams_) << "], Sent: ["
1017 << ListStreams(sent_reset_streams_) << "]";
1018
1019 const size_t num_streams = queued_reset_streams_.size();
1020 const size_t num_bytes =
1021 sizeof(struct sctp_reset_streams) + (num_streams * sizeof(uint16_t));
1022
1023 std::vector<uint8_t> reset_stream_buf(num_bytes, 0);
1024 struct sctp_reset_streams* resetp = reinterpret_cast<sctp_reset_streams*>(
1025 &reset_stream_buf[0]);
1026 resetp->srs_assoc_id = SCTP_ALL_ASSOC;
1027 resetp->srs_flags = SCTP_STREAM_RESET_INCOMING | SCTP_STREAM_RESET_OUTGOING;
1028 resetp->srs_number_streams = rtc::checked_cast<uint16_t>(num_streams);
1029 int result_idx = 0;
1030 for (StreamSet::iterator it = queued_reset_streams_.begin();
1031 it != queued_reset_streams_.end(); ++it) {
1032 resetp->srs_stream_list[result_idx++] = *it;
1033 }
1034
1035 int ret = usrsctp_setsockopt(
1036 sock_, IPPROTO_SCTP, SCTP_RESET_STREAMS, resetp,
1037 rtc::checked_cast<socklen_t>(reset_stream_buf.size()));
1038 if (ret < 0) {
1039 LOG_ERRNO(LS_ERROR) << debug_name_ << "Failed to send a stream reset for "
1040 << num_streams << " streams";
1041 return false;
1042 }
1043
1044 // sent_reset_streams_ is empty, and all the queued_reset_streams_ go into
1045 // it now.
1046 queued_reset_streams_.swap(sent_reset_streams_);
1047 return true;
1048 }
1049
1050 void SctpDataMediaChannel::OnMessage(rtc::Message* msg) {
1051 switch (msg->message_id) {
1052 case MSG_SCTPINBOUNDPACKET: {
1053 std::unique_ptr<InboundPacketMessage> pdata(
1054 static_cast<InboundPacketMessage*>(msg->pdata));
1055 OnInboundPacketFromSctpToChannel(pdata->data().get());
1056 break;
1057 }
1058 case MSG_SCTPOUTBOUNDPACKET: {
1059 std::unique_ptr<OutboundPacketMessage> pdata(
1060 static_cast<OutboundPacketMessage*>(msg->pdata));
1061 OnPacketFromSctpToNetwork(pdata->data().get());
1062 break;
1063 }
1064 }
1065 }
1066 } // namespace cricket
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