OLD | NEW |
| (Empty) |
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(¶ms.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, ¶ms, | |
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(¬ification.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 | |
OLD | NEW |