The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_peeloff.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <netinet/sctp_os.h>
   39 #include <netinet/sctp_pcb.h>
   40 #include <netinet/sctputil.h>
   41 #include <netinet/sctp_var.h>
   42 #include <netinet/sctp_var.h>
   43 #include <netinet/sctp_sysctl.h>
   44 #include <netinet/sctp.h>
   45 #include <netinet/sctp_uio.h>
   46 #include <netinet/sctp_peeloff.h>
   47 #include <netinet/sctputil.h>
   48 #include <netinet/sctp_auth.h>
   49 
   50 int
   51 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
   52 {
   53         struct sctp_inpcb *inp;
   54         struct sctp_tcb *stcb;
   55         uint32_t state;
   56 
   57         if (head == NULL) {
   58                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
   59                 return (EBADF);
   60         }
   61         inp = (struct sctp_inpcb *)head->so_pcb;
   62         if (inp == NULL) {
   63                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   64                 return (EFAULT);
   65         }
   66         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
   67             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
   68                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
   69                 return (EOPNOTSUPP);
   70         }
   71         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
   72         if (stcb == NULL) {
   73                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
   74                 return (ENOENT);
   75         }
   76         state = SCTP_GET_STATE(stcb);
   77         if ((state == SCTP_STATE_EMPTY) ||
   78             (state == SCTP_STATE_INUSE)) {
   79                 SCTP_TCB_UNLOCK(stcb);
   80                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
   81                 return (ENOTCONN);
   82         }
   83         SCTP_TCB_UNLOCK(stcb);
   84         /* We are clear to peel this one off */
   85         return (0);
   86 }
   87 
   88 int
   89 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
   90 {
   91         struct sctp_inpcb *inp, *n_inp;
   92         struct sctp_tcb *stcb;
   93         uint32_t state;
   94 
   95         inp = (struct sctp_inpcb *)head->so_pcb;
   96         if (inp == NULL) {
   97                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   98                 return (EFAULT);
   99         }
  100         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  101         if (stcb == NULL) {
  102                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  103                 return (ENOTCONN);
  104         }
  105 
  106         state = SCTP_GET_STATE(stcb);
  107         if ((state == SCTP_STATE_EMPTY) ||
  108             (state == SCTP_STATE_INUSE)) {
  109                 SCTP_TCB_UNLOCK(stcb);
  110                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  111                 return (ENOTCONN);
  112         }
  113 
  114         n_inp = (struct sctp_inpcb *)so->so_pcb;
  115         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
  116             SCTP_PCB_FLAGS_CONNECTED |
  117             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
  118             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
  119         n_inp->sctp_socket = so;
  120         n_inp->sctp_features = inp->sctp_features;
  121         n_inp->sctp_mobility_features = inp->sctp_mobility_features;
  122         n_inp->sctp_frag_point = inp->sctp_frag_point;
  123         n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
  124         n_inp->ecn_supported = inp->ecn_supported;
  125         n_inp->prsctp_supported = inp->prsctp_supported;
  126         n_inp->auth_supported = inp->auth_supported;
  127         n_inp->asconf_supported = inp->asconf_supported;
  128         n_inp->reconfig_supported = inp->reconfig_supported;
  129         n_inp->nrsack_supported = inp->nrsack_supported;
  130         n_inp->pktdrop_supported = inp->pktdrop_supported;
  131         n_inp->partial_delivery_point = inp->partial_delivery_point;
  132         n_inp->sctp_context = inp->sctp_context;
  133         n_inp->max_cwnd = inp->max_cwnd;
  134         n_inp->local_strreset_support = inp->local_strreset_support;
  135         n_inp->inp_starting_point_for_iterator = NULL;
  136         /* copy in the authentication parameters from the original endpoint */
  137         if (n_inp->sctp_ep.local_hmacs)
  138                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
  139         n_inp->sctp_ep.local_hmacs =
  140             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
  141         if (n_inp->sctp_ep.local_auth_chunks)
  142                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
  143         n_inp->sctp_ep.local_auth_chunks =
  144             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
  145         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
  146             &n_inp->sctp_ep.shared_keys);
  147         /*
  148          * Now we must move it from one hash table to another and get the
  149          * stcb in the right place.
  150          */
  151         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
  152         atomic_add_int(&stcb->asoc.refcnt, 1);
  153         SCTP_TCB_UNLOCK(stcb);
  154 
  155         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  156         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  157 
  158         return (0);
  159 }

Cache object: 399eb06a04cd97bcfc00fe1ec5fb5e69


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