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gstreamer/ext/sctp/usrsctp/usrsctplib/netinet/sctp_peeloff.c
Tim-Philipp Müller f4538e24b6 sctp: import internal copy of usrsctp library 
There are problems with global shared state and no API stability
guarantees, and we can't rely on distros shipping the fixes we
need. Both firefox and Chrome bundle their own copies too.

Imported from https://github.com/sctplab/usrsctp,
commit 547d3b46c64876c0336b9eef297fda58dbe1adaf
Date: Thu Jul 23 21:49:32 2020 +0200

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/870

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1465>
2020-08-14 01:32:45 +01:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) 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.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 OWNER 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.
*/
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 362054 2020-06-11 13:34:09Z tuexen $");
#endif
#include <netinet/sctp_os.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_sysctl.h>
#include <netinet/sctp.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_peeloff.h>
#include <netinet/sctputil.h>
#include <netinet/sctp_auth.h>
int
sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
{
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
uint32_t state;
if (head == NULL) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
return (EBADF);
}
inp = (struct sctp_inpcb *)head->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
return (EFAULT);
}
if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
(inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
return (EOPNOTSUPP);
}
stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
if (stcb == NULL) {
SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
return (ENOENT);
}
state = SCTP_GET_STATE(stcb);
if ((state == SCTP_STATE_EMPTY) ||
(state == SCTP_STATE_INUSE)) {
SCTP_TCB_UNLOCK(stcb);
SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
return (ENOTCONN);
}
SCTP_TCB_UNLOCK(stcb);
/* We are clear to peel this one off */
return (0);
}
int
sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
{
struct sctp_inpcb *inp, *n_inp;
struct sctp_tcb *stcb;
uint32_t state;
inp = (struct sctp_inpcb *)head->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
return (EFAULT);
}
stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
if (stcb == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
return (ENOTCONN);
}
state = SCTP_GET_STATE(stcb);
if ((state == SCTP_STATE_EMPTY) ||
(state == SCTP_STATE_INUSE)) {
SCTP_TCB_UNLOCK(stcb);
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
return (ENOTCONN);
}
n_inp = (struct sctp_inpcb *)so->so_pcb;
n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
SCTP_PCB_FLAGS_CONNECTED |
SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
(SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
n_inp->sctp_socket = so;
n_inp->sctp_features = inp->sctp_features;
n_inp->sctp_mobility_features = inp->sctp_mobility_features;
n_inp->sctp_frag_point = inp->sctp_frag_point;
n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
n_inp->ecn_supported = inp->ecn_supported;
n_inp->prsctp_supported = inp->prsctp_supported;
n_inp->auth_supported = inp->auth_supported;
n_inp->asconf_supported = inp->asconf_supported;
n_inp->reconfig_supported = inp->reconfig_supported;
n_inp->nrsack_supported = inp->nrsack_supported;
n_inp->pktdrop_supported = inp->pktdrop_supported;
n_inp->partial_delivery_point = inp->partial_delivery_point;
n_inp->sctp_context = inp->sctp_context;
n_inp->max_cwnd = inp->max_cwnd;
n_inp->local_strreset_support = inp->local_strreset_support;
n_inp->inp_starting_point_for_iterator = NULL;
/* copy in the authentication parameters from the original endpoint */
if (n_inp->sctp_ep.local_hmacs)
sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
n_inp->sctp_ep.local_hmacs =
sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
if (n_inp->sctp_ep.local_auth_chunks)
sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
n_inp->sctp_ep.local_auth_chunks =
sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
(void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
&n_inp->sctp_ep.shared_keys);
#if defined(__Userspace__)
n_inp->ulp_info = inp->ulp_info;
n_inp->recv_callback = inp->recv_callback;
n_inp->send_callback = inp->send_callback;
n_inp->send_sb_threshold = inp->send_sb_threshold;
#endif
/*
* Now we must move it from one hash table to another and get the
* stcb in the right place.
*/
sctp_move_pcb_and_assoc(inp, n_inp, stcb);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
#if defined(__FreeBSD__) && !defined(__Userspace__)
sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
#else
sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK);
#endif
atomic_subtract_int(&stcb->asoc.refcnt, 1);
return (0);
}
#if defined(HAVE_SCTP_PEELOFF_SOCKOPT)
struct socket *
sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
{
struct socket *newso;
struct sctp_inpcb *inp, *n_inp;
struct sctp_tcb *stcb;
SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
inp = (struct sctp_inpcb *)head->so_pcb;
if (inp == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
*error = EFAULT;
return (NULL);
}
stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
if (stcb == NULL) {
SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
*error = ENOTCONN;
return (NULL);
}
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
#if defined(__FreeBSD__) && !defined(__Userspace__)
CURVNET_SET(head->so_vnet);
#endif
newso = sonewconn(head, SS_ISCONNECTED
#if defined(__APPLE__) && !defined(__Userspace__)
, NULL
#endif
);
#if defined(__FreeBSD__) && !defined(__Userspace__)
CURVNET_RESTORE();
#endif
if (newso == NULL) {
SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
*error = ENOMEM;
atomic_subtract_int(&stcb->asoc.refcnt, 1);
return (NULL);
}
#if defined(__APPLE__) && !defined(__Userspace__)
else {
SCTP_SOCKET_LOCK(newso, 1);
}
#endif
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
n_inp = (struct sctp_inpcb *)newso->so_pcb;
SOCK_LOCK(head);
n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
SCTP_PCB_FLAGS_CONNECTED |
SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
(SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
n_inp->sctp_features = inp->sctp_features;
n_inp->sctp_frag_point = inp->sctp_frag_point;
n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
n_inp->ecn_supported = inp->ecn_supported;
n_inp->prsctp_supported = inp->prsctp_supported;
n_inp->auth_supported = inp->auth_supported;
n_inp->asconf_supported = inp->asconf_supported;
n_inp->reconfig_supported = inp->reconfig_supported;
n_inp->nrsack_supported = inp->nrsack_supported;
n_inp->pktdrop_supported = inp->pktdrop_supported;
n_inp->partial_delivery_point = inp->partial_delivery_point;
n_inp->sctp_context = inp->sctp_context;
n_inp->max_cwnd = inp->max_cwnd;
n_inp->local_strreset_support = inp->local_strreset_support;
n_inp->inp_starting_point_for_iterator = NULL;
#if defined(__Userspace__)
n_inp->ulp_info = inp->ulp_info;
n_inp->recv_callback = inp->recv_callback;
n_inp->send_callback = inp->send_callback;
n_inp->send_sb_threshold = inp->send_sb_threshold;
#endif
/* copy in the authentication parameters from the original endpoint */
if (n_inp->sctp_ep.local_hmacs)
sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
n_inp->sctp_ep.local_hmacs =
sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
if (n_inp->sctp_ep.local_auth_chunks)
sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
n_inp->sctp_ep.local_auth_chunks =
sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
(void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
&n_inp->sctp_ep.shared_keys);
n_inp->sctp_socket = newso;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
n_inp->sctp_ep.auto_close_time = 0;
sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
}
/* Turn off any non-blocking semantic. */
SOCK_LOCK(newso);
SCTP_CLEAR_SO_NBIO(newso);
newso->so_state |= SS_ISCONNECTED;
SOCK_UNLOCK(newso);
/* We remove it right away */
#ifdef SCTP_LOCK_LOGGING
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
}
#endif
TAILQ_REMOVE(&head->so_comp, newso, so_list);
head->so_qlen--;
SOCK_UNLOCK(head);
/*
* Now we must move it from one hash table to another and get the
* stcb in the right place.
*/
sctp_move_pcb_and_assoc(inp, n_inp, stcb);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
/*
* And now the final hack. We move data in the pending side i.e.
* head to the new socket buffer. Let the GRUBBING begin :-0
*/
#if defined(__FreeBSD__) && !defined(__Userspace__)
sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
#else
sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK);
#endif
atomic_subtract_int(&stcb->asoc.refcnt, 1);
return (newso);
}
#endif
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