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gstreamer/ext/sctp/sctpassociation.c

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/*
* Copyright (c) 2015, Collabora Ltd.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "sctpassociation.h"
#include <gst/gst.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
GST_DEBUG_CATEGORY_STATIC (gst_sctp_association_debug_category);
#define GST_CAT_DEFAULT gst_sctp_association_debug_category
GST_DEBUG_CATEGORY_STATIC (gst_sctp_debug_category);
#define GST_SCTP_ASSOCIATION_STATE_TYPE (gst_sctp_association_state_get_type())
static GType
gst_sctp_association_state_get_type (void)
{
static const GEnumValue values[] = {
{GST_SCTP_ASSOCIATION_STATE_NEW, "state-new", "state-new"},
{GST_SCTP_ASSOCIATION_STATE_READY, "state-ready", "state-ready"},
{GST_SCTP_ASSOCIATION_STATE_CONNECTING, "state-connecting",
"state-connecting"},
{GST_SCTP_ASSOCIATION_STATE_CONNECTED, "state-connected",
"state-connected"},
{GST_SCTP_ASSOCIATION_STATE_DISCONNECTING, "state-disconnecting",
"state-disconnecting"},
{GST_SCTP_ASSOCIATION_STATE_DISCONNECTED, "state-disconnected",
"state-disconnected"},
{GST_SCTP_ASSOCIATION_STATE_ERROR, "state-error", "state-error"},
{0, NULL, NULL}
};
static volatile GType id = 0;
if (g_once_init_enter ((gsize *) & id)) {
GType _id;
_id = g_enum_register_static ("GstSctpAssociationState", values);
g_once_init_leave ((gsize *) & id, _id);
}
return id;
}
G_DEFINE_TYPE (GstSctpAssociation, gst_sctp_association, G_TYPE_OBJECT);
enum
{
SIGNAL_STREAM_RESET,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ASSOCIATION_ID,
PROP_LOCAL_PORT,
PROP_REMOTE_PORT,
PROP_STATE,
PROP_USE_SOCK_STREAM,
NUM_PROPERTIES
};
static guint signals[LAST_SIGNAL] = { 0 };
static GParamSpec *properties[NUM_PROPERTIES];
#define DEFAULT_NUMBER_OF_SCTP_STREAMS 1024
#define DEFAULT_LOCAL_SCTP_PORT 0
#define DEFAULT_REMOTE_SCTP_PORT 0
static GHashTable *associations = NULL;
G_LOCK_DEFINE_STATIC (associations_lock);
static guint32 number_of_associations = 0;
/* Interface implementations */
static void gst_sctp_association_finalize (GObject * object);
static void gst_sctp_association_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_sctp_association_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static struct socket *create_sctp_socket (GstSctpAssociation *
gst_sctp_association);
static struct sockaddr_conn get_sctp_socket_address (GstSctpAssociation *
gst_sctp_association, guint16 port);
static gboolean client_role_connect (GstSctpAssociation * self);
static int sctp_packet_out (void *addr, void *buffer, size_t length, guint8 tos,
guint8 set_df);
static int receive_cb (struct socket *sock, union sctp_sockstore addr,
void *data, size_t datalen, struct sctp_rcvinfo rcv_info, gint flags,
void *ulp_info);
static void handle_notification (GstSctpAssociation * self,
const union sctp_notification *notification, size_t length);
static void handle_association_changed (GstSctpAssociation * self,
const struct sctp_assoc_change *sac);
static void handle_stream_reset_event (GstSctpAssociation * self,
const struct sctp_stream_reset_event *ssr);
static void handle_message (GstSctpAssociation * self, guint8 * data,
guint32 datalen, guint16 stream_id, guint32 ppid);
static void maybe_set_state_to_ready (GstSctpAssociation * self);
static gboolean gst_sctp_association_change_state (GstSctpAssociation * self,
GstSctpAssociationState new_state, gboolean lock);
static void
gst_sctp_association_class_init (GstSctpAssociationClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->finalize = gst_sctp_association_finalize;
gobject_class->set_property = gst_sctp_association_set_property;
gobject_class->get_property = gst_sctp_association_get_property;
signals[SIGNAL_STREAM_RESET] =
g_signal_new ("stream-reset", G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstSctpAssociationClass,
on_sctp_stream_reset), NULL, NULL, NULL, G_TYPE_NONE, 1, G_TYPE_UINT);
properties[PROP_ASSOCIATION_ID] = g_param_spec_uint ("association-id",
"The SCTP association-id", "The SCTP association-id.", 0, G_MAXUSHORT,
DEFAULT_LOCAL_SCTP_PORT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_LOCAL_PORT] = g_param_spec_uint ("local-port", "Local SCTP",
"The local SCTP port for this association", 0, G_MAXUSHORT,
DEFAULT_LOCAL_SCTP_PORT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_REMOTE_PORT] =
g_param_spec_uint ("remote-port", "Remote SCTP",
"The remote SCTP port for this association", 0, G_MAXUSHORT,
DEFAULT_LOCAL_SCTP_PORT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_STATE] = g_param_spec_enum ("state", "SCTP Association state",
"The state of the SCTP association", GST_SCTP_ASSOCIATION_STATE_TYPE,
GST_SCTP_ASSOCIATION_STATE_NEW,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
properties[PROP_USE_SOCK_STREAM] =
g_param_spec_boolean ("use-sock-stream", "Use sock-stream",
"When set to TRUE, a sequenced, reliable, connection-based connection is used."
"When TRUE the partial reliability parameters of the channel is ignored.",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, NUM_PROPERTIES, properties);
}
#if defined(SCTP_DEBUG) && !defined(GST_DISABLE_GST_DEBUG)
#define USRSCTP_GST_DEBUG_LEVEL GST_LEVEL_DEBUG
static void
gst_usrsctp_debug (const gchar * format, ...)
{
va_list varargs;
va_start (varargs, format);
gst_debug_log_valist (gst_sctp_debug_category, USRSCTP_GST_DEBUG_LEVEL,
__FILE__, GST_FUNCTION, __LINE__, NULL, format, varargs);
va_end (varargs);
}
#endif
static void
gst_sctp_association_init (GstSctpAssociation * self)
{
/* No need to lock mutex here as long as the function is only called from gst_sctp_association_get */
if (number_of_associations == 0) {
#if defined(SCTP_DEBUG) && !defined(GST_DISABLE_GST_DEBUG)
usrsctp_init (0, sctp_packet_out, gst_usrsctp_debug);
#else
usrsctp_init (0, sctp_packet_out, NULL);
#endif
/* Explicit Congestion Notification */
usrsctp_sysctl_set_sctp_ecn_enable (0);
/* Do not send ABORTs in response to INITs (1).
* Do not send ABORTs for received Out of the Blue packets (2).
*/
usrsctp_sysctl_set_sctp_blackhole (2);
/* Enable interleaving messages for different streams (incoming)
* See: https://tools.ietf.org/html/rfc6458#section-8.1.20
*/
usrsctp_sysctl_set_sctp_default_frag_interleave (2);
usrsctp_sysctl_set_sctp_nr_outgoing_streams_default
(DEFAULT_NUMBER_OF_SCTP_STREAMS);
#if defined(SCTP_DEBUG) && !defined(GST_DISABLE_GST_DEBUG)
if (USRSCTP_GST_DEBUG_LEVEL <= GST_LEVEL_MAX
&& USRSCTP_GST_DEBUG_LEVEL <= _gst_debug_min
&& USRSCTP_GST_DEBUG_LEVEL <=
gst_debug_category_get_threshold (gst_sctp_debug_category)) {
usrsctp_sysctl_set_sctp_debug_on (SCTP_DEBUG_ALL);
}
#endif
}
number_of_associations++;
self->local_port = DEFAULT_LOCAL_SCTP_PORT;
self->remote_port = DEFAULT_REMOTE_SCTP_PORT;
self->sctp_ass_sock = NULL;
g_mutex_init (&self->association_mutex);
self->state = GST_SCTP_ASSOCIATION_STATE_NEW;
self->use_sock_stream = FALSE;
usrsctp_register_address ((void *) self);
}
static void
gst_sctp_association_finalize (GObject * object)
{
GstSctpAssociation *self = GST_SCTP_ASSOCIATION (object);
G_LOCK (associations_lock);
g_hash_table_remove (associations, GUINT_TO_POINTER (self->association_id));
usrsctp_deregister_address ((void *) self);
number_of_associations--;
if (number_of_associations == 0) {
usrsctp_finish ();
}
G_UNLOCK (associations_lock);
G_OBJECT_CLASS (gst_sctp_association_parent_class)->finalize (object);
}
static void
gst_sctp_association_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSctpAssociation *self = GST_SCTP_ASSOCIATION (object);
g_mutex_lock (&self->association_mutex);
if (self->state != GST_SCTP_ASSOCIATION_STATE_NEW) {
switch (prop_id) {
case PROP_LOCAL_PORT:
case PROP_REMOTE_PORT:
GST_ERROR_OBJECT (self, "These properties cannot be set in this state");
goto error;
}
}
switch (prop_id) {
case PROP_ASSOCIATION_ID:
self->association_id = g_value_get_uint (value);
break;
case PROP_LOCAL_PORT:
self->local_port = g_value_get_uint (value);
break;
case PROP_REMOTE_PORT:
self->remote_port = g_value_get_uint (value);
break;
case PROP_STATE:
self->state = g_value_get_enum (value);
break;
case PROP_USE_SOCK_STREAM:
self->use_sock_stream = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
break;
}
g_mutex_unlock (&self->association_mutex);
if (prop_id == PROP_LOCAL_PORT || prop_id == PROP_REMOTE_PORT)
maybe_set_state_to_ready (self);
return;
error:
g_mutex_unlock (&self->association_mutex);
}
static void
maybe_set_state_to_ready (GstSctpAssociation * self)
{
gboolean signal_ready_state = FALSE;
g_mutex_lock (&self->association_mutex);
if ((self->state == GST_SCTP_ASSOCIATION_STATE_NEW) &&
(self->local_port != 0 && self->remote_port != 0)
&& (self->packet_out_cb != NULL) && (self->packet_received_cb != NULL)) {
signal_ready_state =
gst_sctp_association_change_state (self,
GST_SCTP_ASSOCIATION_STATE_READY, FALSE);
}
g_mutex_unlock (&self->association_mutex);
if (signal_ready_state)
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_STATE]);
}
static void
gst_sctp_association_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSctpAssociation *self = GST_SCTP_ASSOCIATION (object);
switch (prop_id) {
case PROP_ASSOCIATION_ID:
g_value_set_uint (value, self->association_id);
break;
case PROP_LOCAL_PORT:
g_value_set_uint (value, self->local_port);
break;
case PROP_REMOTE_PORT:
g_value_set_uint (value, self->remote_port);
break;
case PROP_STATE:
g_value_set_enum (value, self->state);
break;
case PROP_USE_SOCK_STREAM:
g_value_set_boolean (value, self->use_sock_stream);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
break;
}
}
/* Public functions */
GstSctpAssociation *
gst_sctp_association_get (guint32 association_id)
{
GstSctpAssociation *association;
G_LOCK (associations_lock);
GST_DEBUG_CATEGORY_INIT (gst_sctp_association_debug_category,
"sctpassociation", 0, "debug category for sctpassociation");
GST_DEBUG_CATEGORY_INIT (gst_sctp_debug_category,
"sctplib", 0, "debug category for messages from usrsctp");
if (!associations) {
associations =
g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, NULL);
}
association =
g_hash_table_lookup (associations, GUINT_TO_POINTER (association_id));
if (!association) {
association =
g_object_new (GST_SCTP_TYPE_ASSOCIATION, "association-id",
association_id, NULL);
g_hash_table_insert (associations, GUINT_TO_POINTER (association_id),
association);
} else {
g_object_ref (association);
}
G_UNLOCK (associations_lock);
return association;
}
gboolean
gst_sctp_association_start (GstSctpAssociation * self)
{
if (self->state != GST_SCTP_ASSOCIATION_STATE_READY) {
GST_WARNING_OBJECT (self,
"SCTP association is in wrong state and cannot be started");
goto configure_required;
}
if ((self->sctp_ass_sock = create_sctp_socket (self)) == NULL)
goto error;
/* TODO: Support both server and client role */
if (!client_role_connect (self)) {
gst_sctp_association_change_state (self, GST_SCTP_ASSOCIATION_STATE_ERROR,
TRUE);
goto error;
}
gst_sctp_association_change_state (self,
GST_SCTP_ASSOCIATION_STATE_CONNECTING, TRUE);
return TRUE;
error:
gst_sctp_association_change_state (self, GST_SCTP_ASSOCIATION_STATE_ERROR,
TRUE);
return FALSE;
configure_required:
return FALSE;
}
void
gst_sctp_association_set_on_packet_out (GstSctpAssociation * self,
GstSctpAssociationPacketOutCb packet_out_cb, gpointer user_data,
GDestroyNotify destroy_notify)
{
g_return_if_fail (GST_SCTP_IS_ASSOCIATION (self));
g_mutex_lock (&self->association_mutex);
if (self->packet_out_destroy_notify)
self->packet_out_destroy_notify (self->packet_out_user_data);
self->packet_out_cb = packet_out_cb;
self->packet_out_user_data = user_data;
self->packet_out_destroy_notify = destroy_notify;
g_mutex_unlock (&self->association_mutex);
maybe_set_state_to_ready (self);
}
void
gst_sctp_association_set_on_packet_received (GstSctpAssociation * self,
GstSctpAssociationPacketReceivedCb packet_received_cb, gpointer user_data,
GDestroyNotify destroy_notify)
{
g_return_if_fail (GST_SCTP_IS_ASSOCIATION (self));
g_mutex_lock (&self->association_mutex);
if (self->packet_received_destroy_notify)
self->packet_received_destroy_notify (self->packet_received_user_data);
self->packet_received_cb = packet_received_cb;
self->packet_received_user_data = user_data;
self->packet_received_destroy_notify = destroy_notify;
g_mutex_unlock (&self->association_mutex);
maybe_set_state_to_ready (self);
}
void
gst_sctp_association_incoming_packet (GstSctpAssociation * self,
const guint8 * buf, guint32 length)
{
usrsctp_conninput ((void *) self, (const void *) buf, (size_t) length, 0);
}
GstFlowReturn
gst_sctp_association_send_data (GstSctpAssociation * self, const guint8 * buf,
guint32 length, guint16 stream_id, guint32 ppid, gboolean ordered,
GstSctpAssociationPartialReliability pr, guint32 reliability_param,
guint32 * bytes_sent_)
{
GstFlowReturn flow_ret;
struct sctp_sendv_spa spa;
gint32 bytes_sent = 0;
struct sockaddr_conn remote_addr;
g_mutex_lock (&self->association_mutex);
if (self->state != GST_SCTP_ASSOCIATION_STATE_CONNECTED) {
if (self->state == GST_SCTP_ASSOCIATION_STATE_DISCONNECTED ||
self->state == GST_SCTP_ASSOCIATION_STATE_DISCONNECTING) {
GST_ERROR_OBJECT (self, "Disconnected");
flow_ret = GST_FLOW_EOS;
g_mutex_unlock (&self->association_mutex);
goto end;
} else {
GST_ERROR_OBJECT (self, "Association not connected yet");
flow_ret = GST_FLOW_ERROR;
g_mutex_unlock (&self->association_mutex);
goto end;
}
}
remote_addr = get_sctp_socket_address (self, self->remote_port);
g_mutex_unlock (&self->association_mutex);
/* TODO: We probably want to split too large chunks into multiple packets
* and only set the SCTP_EOR flag on the last one. Firefox is using 0x4000
* as the maximum packet size
*/
memset (&spa, 0, sizeof (spa));
spa.sendv_sndinfo.snd_ppid = g_htonl (ppid);
spa.sendv_sndinfo.snd_sid = stream_id;
spa.sendv_sndinfo.snd_flags = SCTP_EOR | (ordered ? 0 : SCTP_UNORDERED);
spa.sendv_sndinfo.snd_context = 0;
spa.sendv_sndinfo.snd_assoc_id = 0;
spa.sendv_flags = SCTP_SEND_SNDINFO_VALID;
if (pr != GST_SCTP_ASSOCIATION_PARTIAL_RELIABILITY_NONE) {
spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
spa.sendv_prinfo.pr_value = g_htonl (reliability_param);
if (pr == GST_SCTP_ASSOCIATION_PARTIAL_RELIABILITY_TTL)
spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_TTL;
else if (pr == GST_SCTP_ASSOCIATION_PARTIAL_RELIABILITY_RTX)
spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_RTX;
else if (pr == GST_SCTP_ASSOCIATION_PARTIAL_RELIABILITY_BUF)
spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_BUF;
}
bytes_sent =
usrsctp_sendv (self->sctp_ass_sock, buf, length,
(struct sockaddr *) &remote_addr, 1, (void *) &spa,
(socklen_t) sizeof (struct sctp_sendv_spa), SCTP_SENDV_SPA, 0);
if (bytes_sent < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
bytes_sent = 0;
/* Resending this buffer is taken care of by the gstsctpenc */
flow_ret = GST_FLOW_OK;
goto end;
} else {
GST_ERROR_OBJECT (self, "Error sending data on stream %u: (%u) %s",
stream_id, errno, g_strerror (errno));
flow_ret = GST_FLOW_ERROR;
goto end;
}
}
flow_ret = GST_FLOW_OK;
end:
if (bytes_sent_)
*bytes_sent_ = bytes_sent;
return flow_ret;
}
void
gst_sctp_association_reset_stream (GstSctpAssociation * self, guint16 stream_id)
{
struct sctp_reset_streams *srs;
socklen_t length;
length = (socklen_t) (sizeof (struct sctp_reset_streams) + sizeof (guint16));
srs = (struct sctp_reset_streams *) g_malloc0 (length);
srs->srs_flags = SCTP_STREAM_RESET_OUTGOING;
srs->srs_number_streams = 1;
srs->srs_stream_list[0] = stream_id;
usrsctp_setsockopt (self->sctp_ass_sock, IPPROTO_SCTP, SCTP_RESET_STREAMS,
srs, length);
g_free (srs);
}
void
gst_sctp_association_force_close (GstSctpAssociation * self)
{
if (self->sctp_ass_sock) {
struct socket *s = self->sctp_ass_sock;
self->sctp_ass_sock = NULL;
usrsctp_close (s);
}
gst_sctp_association_change_state (self,
GST_SCTP_ASSOCIATION_STATE_DISCONNECTED, TRUE);
}
static struct socket *
create_sctp_socket (GstSctpAssociation * self)
{
struct socket *sock;
struct linger l;
struct sctp_event event;
struct sctp_assoc_value stream_reset;
int buf_size = 1024 * 1024;
int value = 1;
guint16 event_types[] = {
SCTP_ASSOC_CHANGE,
SCTP_PEER_ADDR_CHANGE,
SCTP_REMOTE_ERROR,
SCTP_SEND_FAILED,
SCTP_SEND_FAILED_EVENT,
SCTP_SHUTDOWN_EVENT,
SCTP_ADAPTATION_INDICATION,
SCTP_PARTIAL_DELIVERY_EVENT,
/*SCTP_AUTHENTICATION_EVENT, */
SCTP_STREAM_RESET_EVENT,
/*SCTP_SENDER_DRY_EVENT, */
/*SCTP_NOTIFICATIONS_STOPPED_EVENT, */
/*SCTP_ASSOC_RESET_EVENT, */
SCTP_STREAM_CHANGE_EVENT
};
guint32 i;
guint sock_type = self->use_sock_stream ? SOCK_STREAM : SOCK_SEQPACKET;
if ((sock =
usrsctp_socket (AF_CONN, sock_type, IPPROTO_SCTP, receive_cb, NULL, 0,
(void *) self)) == NULL) {
GST_ERROR_OBJECT (self, "Could not open SCTP socket: (%u) %s", errno,
g_strerror (errno));
goto error;
}
if (usrsctp_setsockopt (sock, SOL_SOCKET, SO_RCVBUF,
(const void *) &buf_size, sizeof (buf_size)) < 0) {
GST_ERROR_OBJECT (self, "Could not change receive buffer size: (%u) %s",
errno, g_strerror (errno));
goto error;
}
if (usrsctp_setsockopt (sock, SOL_SOCKET, SO_SNDBUF,
(const void *) &buf_size, sizeof (buf_size)) < 0) {
GST_ERROR_OBJECT (self, "Could not change send buffer size: (%u) %s",
errno, g_strerror (errno));
goto error;
}
/* Properly return errors */
if (usrsctp_set_non_blocking (sock, 1) < 0) {
GST_ERROR_OBJECT (self,
"Could not set non-blocking mode on SCTP socket: (%u) %s", errno,
g_strerror (errno));
goto error;
}
memset (&l, 0, sizeof (l));
l.l_onoff = 1;
l.l_linger = 0;
if (usrsctp_setsockopt (sock, SOL_SOCKET, SO_LINGER, (const void *) &l,
(socklen_t) sizeof (struct linger)) < 0) {
GST_ERROR_OBJECT (self, "Could not set SO_LINGER on SCTP socket: (%u) %s",
errno, g_strerror (errno));
goto error;
}
if (usrsctp_setsockopt (sock, IPPROTO_SCTP, SCTP_REUSE_PORT, &value,
sizeof (int))) {
GST_DEBUG_OBJECT (self, "Could not set SCTP_REUSE_PORT: (%u) %s", errno,
g_strerror (errno));
}
if (usrsctp_setsockopt (sock, IPPROTO_SCTP, SCTP_NODELAY, &value,
sizeof (int))) {
GST_DEBUG_OBJECT (self, "Could not set SCTP_NODELAY: (%u) %s", errno,
g_strerror (errno));
goto error;
}
if (usrsctp_setsockopt (sock, IPPROTO_SCTP, SCTP_EXPLICIT_EOR, &value,
sizeof (int))) {
GST_ERROR_OBJECT (self, "Could not set SCTP_EXPLICIT_EOR: (%u) %s", errno,
g_strerror (errno));
goto error;
}
memset (&stream_reset, 0, sizeof (stream_reset));
stream_reset.assoc_id = SCTP_ALL_ASSOC;
stream_reset.assoc_value =
SCTP_ENABLE_RESET_STREAM_REQ | SCTP_ENABLE_CHANGE_ASSOC_REQ;
if (usrsctp_setsockopt (sock, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET,
&stream_reset, sizeof (stream_reset))) {
GST_ERROR_OBJECT (self,
"Could not set SCTP_ENABLE_STREAM_RESET | SCTP_ENABLE_CHANGE_ASSOC_REQ: (%u) %s",
errno, g_strerror (errno));
goto error;
}
memset (&event, 0, sizeof (event));
event.se_assoc_id = SCTP_ALL_ASSOC;
event.se_on = 1;
for (i = 0; i < sizeof (event_types) / sizeof (event_types[0]); i++) {
event.se_type = event_types[i];
if (usrsctp_setsockopt (sock, IPPROTO_SCTP, SCTP_EVENT,
&event, sizeof (event)) < 0) {
GST_ERROR_OBJECT (self, "Failed to register event %u: (%u) %s",
event_types[i], errno, g_strerror (errno));
}
}
return sock;
error:
if (sock)
usrsctp_close (sock);
return NULL;
}
static struct sockaddr_conn
get_sctp_socket_address (GstSctpAssociation * gst_sctp_association,
guint16 port)
{
struct sockaddr_conn addr;
memset ((void *) &addr, 0, sizeof (struct sockaddr_conn));
#ifdef __APPLE__
addr.sconn_len = sizeof (struct sockaddr_conn);
#endif
addr.sconn_family = AF_CONN;
addr.sconn_port = g_htons (port);
addr.sconn_addr = (void *) gst_sctp_association;
return addr;
}
static gboolean
client_role_connect (GstSctpAssociation * self)
{
struct sockaddr_conn local_addr, remote_addr;
struct sctp_paddrparams paddrparams;
socklen_t opt_len;
gint ret;
g_mutex_lock (&self->association_mutex);
local_addr = get_sctp_socket_address (self, self->local_port);
remote_addr = get_sctp_socket_address (self, self->remote_port);
g_mutex_unlock (&self->association_mutex);
ret =
usrsctp_bind (self->sctp_ass_sock, (struct sockaddr *) &local_addr,
sizeof (struct sockaddr_conn));
if (ret < 0) {
GST_ERROR_OBJECT (self, "usrsctp_bind() error: (%u) %s", errno,
g_strerror (errno));
goto error;
}
ret =
usrsctp_connect (self->sctp_ass_sock, (struct sockaddr *) &remote_addr,
sizeof (struct sockaddr_conn));
if (ret < 0 && errno != EINPROGRESS) {
GST_ERROR_OBJECT (self, "usrsctp_connect() error: (%u) %s", errno,
g_strerror (errno));
goto error;
}
memset (&paddrparams, 0, sizeof (struct sctp_paddrparams));
memcpy (&paddrparams.spp_address, &remote_addr,
sizeof (struct sockaddr_conn));
opt_len = (socklen_t) sizeof (struct sctp_paddrparams);
ret =
usrsctp_getsockopt (self->sctp_ass_sock, IPPROTO_SCTP,
SCTP_PEER_ADDR_PARAMS, &paddrparams, &opt_len);
if (ret < 0) {
GST_WARNING_OBJECT (self,
"usrsctp_getsockopt(SCTP_PEER_ADDR_PARAMS) error: (%u) %s", errno,
g_strerror (errno));
} else {
/* draft-ietf-rtcweb-data-channel-13 section 5: max initial MTU IPV4 1200, IPV6 1280 */
paddrparams.spp_pathmtu = 1200;
paddrparams.spp_flags &= ~SPP_PMTUD_ENABLE;
paddrparams.spp_flags |= SPP_PMTUD_DISABLE;
opt_len = (socklen_t) sizeof (struct sctp_paddrparams);
ret = usrsctp_setsockopt (self->sctp_ass_sock, IPPROTO_SCTP,
SCTP_PEER_ADDR_PARAMS, &paddrparams, opt_len);
if (ret < 0) {
GST_WARNING_OBJECT (self,
"usrsctp_setsockopt(SCTP_PEER_ADDR_PARAMS) error: (%u) %s", errno,
g_strerror (errno));
} else {
GST_DEBUG_OBJECT (self, "PMTUD disabled, MTU set to %u",
paddrparams.spp_pathmtu);
}
}
return TRUE;
error:
return FALSE;
}
static int
sctp_packet_out (void *addr, void *buffer, size_t length, guint8 tos,
guint8 set_df)
{
GstSctpAssociation *self = GST_SCTP_ASSOCIATION (addr);
g_mutex_lock (&self->association_mutex);
if (self->packet_out_cb) {
self->packet_out_cb (self, buffer, length, self->packet_out_user_data);
}
g_mutex_unlock (&self->association_mutex);
return 0;
}
static int
receive_cb (struct socket *sock, union sctp_sockstore addr, void *data,
size_t datalen, struct sctp_rcvinfo rcv_info, gint flags, void *ulp_info)
{
GstSctpAssociation *self = GST_SCTP_ASSOCIATION (ulp_info);
if (!data) {
/* Not sure if this can happend. */
GST_WARNING_OBJECT (self, "Received empty data buffer");
} else {
if (flags & MSG_NOTIFICATION) {
handle_notification (self, (const union sctp_notification *) data,
datalen);
/* We use this instead of a bare `free()` so that we use the `free` from
* the C runtime that usrsctp was built with. This makes a difference on
* Windows where libusrstcp and GStreamer can be linked to two different
* CRTs. */
usrsctp_freedumpbuffer (data);
} else {
handle_message (self, data, datalen, rcv_info.rcv_sid,
ntohl (rcv_info.rcv_ppid));
}
}
return 1;
}
static void
handle_notification (GstSctpAssociation * self,
const union sctp_notification *notification, size_t length)
{
g_assert (notification->sn_header.sn_length == length);
switch (notification->sn_header.sn_type) {
case SCTP_ASSOC_CHANGE:
GST_DEBUG_OBJECT (self, "Event: SCTP_ASSOC_CHANGE");
handle_association_changed (self, &notification->sn_assoc_change);
break;
case SCTP_PEER_ADDR_CHANGE:
GST_DEBUG_OBJECT (self, "Event: SCTP_PEER_ADDR_CHANGE");
break;
case SCTP_REMOTE_ERROR:
GST_ERROR_OBJECT (self, "Event: SCTP_REMOTE_ERROR (%u)",
notification->sn_remote_error.sre_error);
break;
case SCTP_SEND_FAILED:
GST_ERROR_OBJECT (self, "Event: SCTP_SEND_FAILED");
break;
case SCTP_SHUTDOWN_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_SHUTDOWN_EVENT");
gst_sctp_association_change_state (self,
GST_SCTP_ASSOCIATION_STATE_DISCONNECTING, TRUE);
break;
case SCTP_ADAPTATION_INDICATION:
GST_DEBUG_OBJECT (self, "Event: SCTP_ADAPTATION_INDICATION");
break;
case SCTP_PARTIAL_DELIVERY_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_PARTIAL_DELIVERY_EVENT");
break;
case SCTP_AUTHENTICATION_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_AUTHENTICATION_EVENT");
break;
case SCTP_STREAM_RESET_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_STREAM_RESET_EVENT");
handle_stream_reset_event (self, &notification->sn_strreset_event);
break;
case SCTP_SENDER_DRY_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_SENDER_DRY_EVENT");
break;
case SCTP_NOTIFICATIONS_STOPPED_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_NOTIFICATIONS_STOPPED_EVENT");
break;
case SCTP_ASSOC_RESET_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_ASSOC_RESET_EVENT");
break;
case SCTP_STREAM_CHANGE_EVENT:
GST_DEBUG_OBJECT (self, "Event: SCTP_STREAM_CHANGE_EVENT");
break;
case SCTP_SEND_FAILED_EVENT:
GST_ERROR_OBJECT (self, "Event: SCTP_SEND_FAILED_EVENT (%u)",
notification->sn_send_failed_event.ssfe_error);
break;
default:
break;
}
}
static void
handle_association_changed (GstSctpAssociation * self,
const struct sctp_assoc_change *sac)
{
gboolean change_state = FALSE;
GstSctpAssociationState new_state;
switch (sac->sac_state) {
case SCTP_COMM_UP:
GST_DEBUG_OBJECT (self, "SCTP_COMM_UP");
g_mutex_lock (&self->association_mutex);
if (self->state == GST_SCTP_ASSOCIATION_STATE_CONNECTING) {
change_state = TRUE;
new_state = GST_SCTP_ASSOCIATION_STATE_CONNECTED;
GST_DEBUG_OBJECT (self, "SCTP association connected!");
} else if (self->state == GST_SCTP_ASSOCIATION_STATE_CONNECTED) {
GST_FIXME_OBJECT (self, "SCTP association already open");
} else {
GST_WARNING_OBJECT (self, "SCTP association in unexpected state");
}
g_mutex_unlock (&self->association_mutex);
break;
case SCTP_COMM_LOST:
GST_WARNING_OBJECT (self, "SCTP event SCTP_COMM_LOST received");
change_state = TRUE;
new_state = GST_SCTP_ASSOCIATION_STATE_ERROR;
break;
case SCTP_RESTART:
GST_DEBUG_OBJECT (self, "SCTP event SCTP_RESTART received");
break;
case SCTP_SHUTDOWN_COMP:
GST_DEBUG_OBJECT (self, "SCTP event SCTP_SHUTDOWN_COMP received");
change_state = TRUE;
new_state = GST_SCTP_ASSOCIATION_STATE_DISCONNECTED;
break;
case SCTP_CANT_STR_ASSOC:
GST_WARNING_OBJECT (self, "SCTP event SCTP_CANT_STR_ASSOC received");
change_state = TRUE;
new_state = GST_SCTP_ASSOCIATION_STATE_ERROR;
break;
}
if (change_state)
gst_sctp_association_change_state (self, new_state, TRUE);
}
static void
handle_stream_reset_event (GstSctpAssociation * self,
const struct sctp_stream_reset_event *sr)
{
guint32 i, n;
if (!(sr->strreset_flags & SCTP_STREAM_RESET_DENIED) &&
!(sr->strreset_flags & SCTP_STREAM_RESET_DENIED)) {
n = (sr->strreset_length -
sizeof (struct sctp_stream_reset_event)) / sizeof (uint16_t);
for (i = 0; i < n; i++) {
if (sr->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
g_signal_emit (self, signals[SIGNAL_STREAM_RESET], 0,
sr->strreset_stream_list[i]);
}
}
}
}
static void
handle_message (GstSctpAssociation * self, guint8 * data, guint32 datalen,
guint16 stream_id, guint32 ppid)
{
g_mutex_lock (&self->association_mutex);
if (self->packet_received_cb) {
/* It's the callbacks job to free the data correctly */
self->packet_received_cb (self, data, datalen, stream_id, ppid,
self->packet_received_user_data);
} else {
/* We use this instead of a bare `free()` so that we use the `free` from
* the C runtime that usrsctp was built with. This makes a difference on
* Windows where libusrstcp and GStreamer can be linked to two different
* CRTs. */
usrsctp_freedumpbuffer ((gchar *) data);
}
g_mutex_unlock (&self->association_mutex);
}
/* Returns TRUE if lock==FALSE and notification is needed later.
* Takes the mutex shortly if lock==TRUE! */
static gboolean
gst_sctp_association_change_state (GstSctpAssociation * self,
GstSctpAssociationState new_state, gboolean lock)
{
if (lock)
g_mutex_lock (&self->association_mutex);
if (self->state != new_state
&& self->state != GST_SCTP_ASSOCIATION_STATE_ERROR) {
self->state = new_state;
if (lock) {
g_mutex_unlock (&self->association_mutex);
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_STATE]);
return FALSE;
} else {
return TRUE;
}
} else {
if (lock)
g_mutex_unlock (&self->association_mutex);
return FALSE;
}
}
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