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  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/9.1/sys/netinet/sctp_peeloff.c 237896 2012-07-01 07:59:00Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <netinet/sctp_pcb.h>
   38 #include <netinet/sctputil.h>
   39 #include <netinet/sctp_var.h>
   40 #include <netinet/sctp_var.h>
   41 #include <netinet/sctp_sysctl.h>
   42 #include <netinet/sctp.h>
   43 #include <netinet/sctp_uio.h>
   44 #include <netinet/sctp_peeloff.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 
   48 
   49 int
   50 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
   51 {
   52         struct sctp_inpcb *inp;
   53         struct sctp_tcb *stcb;
   54         uint32_t state;
   55 
   56         if (head == NULL) {
   57                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
   58                 return (EBADF);
   59         }
   60         inp = (struct sctp_inpcb *)head->so_pcb;
   61         if (inp == NULL) {
   62                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   63                 return (EFAULT);
   64         }
   65         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
   66             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
   67                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
   68                 return (EOPNOTSUPP);
   69         }
   70         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
   71         if (stcb == NULL) {
   72                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
   73                 return (ENOENT);
   74         }
   75         state = SCTP_GET_STATE((&stcb->asoc));
   76         if ((state == SCTP_STATE_EMPTY) ||
   77             (state == SCTP_STATE_INUSE) ||
   78             (state == SCTP_STATE_COOKIE_WAIT) ||
   79             (state == SCTP_STATE_COOKIE_ECHOED)) {
   80                 SCTP_TCB_UNLOCK(stcb);
   81                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
   82                 return (ENOTCONN);
   83         }
   84         SCTP_TCB_UNLOCK(stcb);
   85         /* We are clear to peel this one off */
   86         return (0);
   87 }
   88 
   89 int
   90 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
   91 {
   92         struct sctp_inpcb *inp, *n_inp;
   93         struct sctp_tcb *stcb;
   94         uint32_t state;
   95 
   96         inp = (struct sctp_inpcb *)head->so_pcb;
   97         if (inp == NULL) {
   98                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
   99                 return (EFAULT);
  100         }
  101         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  102         if (stcb == NULL) {
  103                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  104                 return (ENOTCONN);
  105         }
  106         state = SCTP_GET_STATE((&stcb->asoc));
  107         if ((state == SCTP_STATE_EMPTY) ||
  108             (state == SCTP_STATE_INUSE) ||
  109             (state == SCTP_STATE_COOKIE_WAIT) ||
  110             (state == SCTP_STATE_COOKIE_ECHOED)) {
  111                 SCTP_TCB_UNLOCK(stcb);
  112                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  113                 return (ENOTCONN);
  114         }
  115         n_inp = (struct sctp_inpcb *)so->so_pcb;
  116         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
  117             SCTP_PCB_FLAGS_CONNECTED |
  118             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
  119             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
  120         n_inp->sctp_socket = so;
  121         n_inp->sctp_features = inp->sctp_features;
  122         n_inp->sctp_mobility_features = inp->sctp_mobility_features;
  123         n_inp->sctp_frag_point = inp->sctp_frag_point;
  124         n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
  125         n_inp->sctp_ecn_enable = inp->sctp_ecn_enable;
  126         n_inp->partial_delivery_point = inp->partial_delivery_point;
  127         n_inp->sctp_context = inp->sctp_context;
  128         n_inp->local_strreset_support = inp->local_strreset_support;
  129         n_inp->inp_starting_point_for_iterator = NULL;
  130         /* copy in the authentication parameters from the original endpoint */
  131         if (n_inp->sctp_ep.local_hmacs)
  132                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
  133         n_inp->sctp_ep.local_hmacs =
  134             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
  135         if (n_inp->sctp_ep.local_auth_chunks)
  136                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
  137         n_inp->sctp_ep.local_auth_chunks =
  138             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
  139         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
  140             &n_inp->sctp_ep.shared_keys);
  141         /*
  142          * Now we must move it from one hash table to another and get the
  143          * stcb in the right place.
  144          */
  145         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
  146         atomic_add_int(&stcb->asoc.refcnt, 1);
  147         SCTP_TCB_UNLOCK(stcb);
  148 
  149         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  150         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  151 
  152         return (0);
  153 }
  154 
  155 
  156 struct socket *
  157 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
  158 {
  159         struct socket *newso;
  160         struct sctp_inpcb *inp, *n_inp;
  161         struct sctp_tcb *stcb;
  162 
  163         SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
  164         inp = (struct sctp_inpcb *)head->so_pcb;
  165         if (inp == NULL) {
  166                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
  167                 *error = EFAULT;
  168                 return (NULL);
  169         }
  170         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  171         if (stcb == NULL) {
  172                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  173                 *error = ENOTCONN;
  174                 return (NULL);
  175         }
  176         atomic_add_int(&stcb->asoc.refcnt, 1);
  177         SCTP_TCB_UNLOCK(stcb);
  178         CURVNET_SET(head->so_vnet);
  179         newso = sonewconn(head, SS_ISCONNECTED
  180             );
  181         CURVNET_RESTORE();
  182         if (newso == NULL) {
  183                 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
  184                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
  185                 *error = ENOMEM;
  186                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
  187                 return (NULL);
  188 
  189         }
  190         SCTP_TCB_LOCK(stcb);
  191         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  192         n_inp = (struct sctp_inpcb *)newso->so_pcb;
  193         SOCK_LOCK(head);
  194         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
  195             SCTP_PCB_FLAGS_CONNECTED |
  196             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
  197             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
  198         n_inp->sctp_features = inp->sctp_features;
  199         n_inp->sctp_frag_point = inp->sctp_frag_point;
  200         n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
  201         n_inp->sctp_ecn_enable = inp->sctp_ecn_enable;
  202         n_inp->partial_delivery_point = inp->partial_delivery_point;
  203         n_inp->sctp_context = inp->sctp_context;
  204         n_inp->local_strreset_support = inp->local_strreset_support;
  205         n_inp->inp_starting_point_for_iterator = NULL;
  206 
  207         /* copy in the authentication parameters from the original endpoint */
  208         if (n_inp->sctp_ep.local_hmacs)
  209                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
  210         n_inp->sctp_ep.local_hmacs =
  211             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
  212         if (n_inp->sctp_ep.local_auth_chunks)
  213                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
  214         n_inp->sctp_ep.local_auth_chunks =
  215             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
  216         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
  217             &n_inp->sctp_ep.shared_keys);
  218 
  219         n_inp->sctp_socket = newso;
  220         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
  221                 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
  222                 n_inp->sctp_ep.auto_close_time = 0;
  223                 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
  224                     SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
  225         }
  226         /* Turn off any non-blocking semantic. */
  227         SCTP_CLEAR_SO_NBIO(newso);
  228         newso->so_state |= SS_ISCONNECTED;
  229         /* We remove it right away */
  230 
  231 #ifdef SCTP_LOCK_LOGGING
  232         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
  233                 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
  234         }
  235 #endif
  236         TAILQ_REMOVE(&head->so_comp, newso, so_list);
  237         head->so_qlen--;
  238         SOCK_UNLOCK(head);
  239         /*
  240          * Now we must move it from one hash table to another and get the
  241          * stcb in the right place.
  242          */
  243         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
  244         atomic_add_int(&stcb->asoc.refcnt, 1);
  245         SCTP_TCB_UNLOCK(stcb);
  246         /*
  247          * And now the final hack. We move data in the pending side i.e.
  248          * head to the new socket buffer. Let the GRUBBING begin :-0
  249          */
  250         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
  251         atomic_subtract_int(&stcb->asoc.refcnt, 1);
  252         return (newso);
  253 }

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