text: /*-
   * 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.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #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->asoc));
  	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->asoc));
  	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);
  	/*
  	 * 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);
  
  	sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  	atomic_subtract_int(&stcb->asoc.refcnt, 1);
  
  	return (0);
  }
  