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

     /*-
      * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/netinet/sctp_peeloff.c 337708 2018-08-13 13:58:45Z tuexen $");
    
    #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);
           /*
            * 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);
   }

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