sys/netinet/sctp_peeloff.c

   1 /*-
   2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  * a) Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  *
  10  * b) Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *   the documentation and/or other materials provided with the distribution.
  13  *
  14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31
  32 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $         */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  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         inp = (struct sctp_inpcb *)head->so_pcb;
  57         if (inp == NULL) {
  58                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
  59                 return (EFAULT);
  60         }
  61         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  62         if (stcb == NULL) {
  63                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
  64                 return (ENOENT);
  65         }
  66         state = SCTP_GET_STATE((&stcb->asoc));
  67         if ((state == SCTP_STATE_EMPTY) ||
  68             (state == SCTP_STATE_INUSE) ||
  69             (state == SCTP_STATE_COOKIE_WAIT) ||
  70             (state == SCTP_STATE_COOKIE_ECHOED)) {
  71                 SCTP_TCB_UNLOCK(stcb);
  72                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  73                 return (ENOTCONN);
  74         }
  75         SCTP_TCB_UNLOCK(stcb);
  76         /* We are clear to peel this one off */
  77         return (0);
  78 }
  79
  80 int
  81 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
  82 {
  83         struct sctp_inpcb *inp, *n_inp;
  84         struct sctp_tcb *stcb;
  85         uint32_t state;
  86
  87         inp = (struct sctp_inpcb *)head->so_pcb;
  88         if (inp == NULL) {
  89                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
  90                 return (EFAULT);
  91         }
  92         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
  93         if (stcb == NULL) {
  94                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
  95                 return (ENOTCONN);
  96         }
  97         state = SCTP_GET_STATE((&stcb->asoc));
  98         if ((state == SCTP_STATE_EMPTY) ||
  99             (state == SCTP_STATE_INUSE) ||
 100             (state == SCTP_STATE_COOKIE_WAIT) ||
 101             (state == SCTP_STATE_COOKIE_ECHOED)) {
 102                 SCTP_TCB_UNLOCK(stcb);
 103                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
 104                 return (ENOTCONN);
 105         }
 106         n_inp = (struct sctp_inpcb *)so->so_pcb;
 107         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
 108             SCTP_PCB_FLAGS_CONNECTED |
 109             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
 110             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
 111         n_inp->sctp_socket = so;
 112         n_inp->sctp_features = inp->sctp_features;
 113         n_inp->sctp_mobility_features = inp->sctp_mobility_features;
 114         n_inp->sctp_frag_point = inp->sctp_frag_point;
 115         n_inp->partial_delivery_point = inp->partial_delivery_point;
 116         n_inp->sctp_context = inp->sctp_context;
 117         n_inp->inp_starting_point_for_iterator = NULL;
 118         /* copy in the authentication parameters from the original endpoint */
 119         if (n_inp->sctp_ep.local_hmacs)
 120                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
 121         n_inp->sctp_ep.local_hmacs =
 122             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
 123         if (n_inp->sctp_ep.local_auth_chunks)
 124                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
 125         n_inp->sctp_ep.local_auth_chunks =
 126             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
 127         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
 128             &n_inp->sctp_ep.shared_keys);
 129         /*
 130          * Now we must move it from one hash table to another and get the
 131          * stcb in the right place.
 132          */
 133         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
 134         atomic_add_int(&stcb->asoc.refcnt, 1);
 135         SCTP_TCB_UNLOCK(stcb);
 136
 137         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
 138         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 139
 140         return (0);
 141 }
 142
 143
 144 struct socket *
 145 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
 146 {
 147         struct socket *newso;
 148         struct sctp_inpcb *inp, *n_inp;
 149         struct sctp_tcb *stcb;
 150
 151         SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
 152         inp = (struct sctp_inpcb *)head->so_pcb;
 153         if (inp == NULL) {
 154                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
 155                 *error = EFAULT;
 156                 return (NULL);
 157         }
 158         stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
 159         if (stcb == NULL) {
 160                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
 161                 *error = ENOTCONN;
 162                 return (NULL);
 163         }
 164         atomic_add_int(&stcb->asoc.refcnt, 1);
 165         SCTP_TCB_UNLOCK(stcb);
 166         newso = sonewconn(head, SS_ISCONNECTED
 167             );
 168         if (newso == NULL) {
 169                 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
 170                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
 171                 *error = ENOMEM;
 172                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 173                 return (NULL);
 174
 175         }
 176         SCTP_TCB_LOCK(stcb);
 177         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 178         n_inp = (struct sctp_inpcb *)newso->so_pcb;
 179         SOCK_LOCK(head);
 180         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
 181             SCTP_PCB_FLAGS_CONNECTED |
 182             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
 183             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
 184         n_inp->sctp_features = inp->sctp_features;
 185         n_inp->sctp_frag_point = inp->sctp_frag_point;
 186         n_inp->partial_delivery_point = inp->partial_delivery_point;
 187         n_inp->sctp_context = inp->sctp_context;
 188         n_inp->inp_starting_point_for_iterator = NULL;
 189
 190         /* copy in the authentication parameters from the original endpoint */
 191         if (n_inp->sctp_ep.local_hmacs)
 192                 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
 193         n_inp->sctp_ep.local_hmacs =
 194             sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
 195         if (n_inp->sctp_ep.local_auth_chunks)
 196                 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
 197         n_inp->sctp_ep.local_auth_chunks =
 198             sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
 199         (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
 200             &n_inp->sctp_ep.shared_keys);
 201
 202         n_inp->sctp_socket = newso;
 203         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
 204                 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
 205                 n_inp->sctp_ep.auto_close_time = 0;
 206                 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
 207                     SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
 208         }
 209         /* Turn off any non-blocking semantic. */
 210         SCTP_CLEAR_SO_NBIO(newso);
 211         newso->so_state |= SS_ISCONNECTED;
 212         /* We remove it right away */
 213
 214 #ifdef SCTP_LOCK_LOGGING
 215         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
 216                 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
 217         }
 218 #endif
 219         TAILQ_REMOVE(&head->so_comp, newso, so_list);
 220         head->so_qlen--;
 221         SOCK_UNLOCK(head);
 222         /*
 223          * Now we must move it from one hash table to another and get the
 224          * stcb in the right place.
 225          */
 226         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
 227         atomic_add_int(&stcb->asoc.refcnt, 1);
 228         SCTP_TCB_UNLOCK(stcb);
 229         /*
 230          * And now the final hack. We move data in the pending side i.e.
 231          * head to the new socket buffer. Let the GRUBBING begin :-0
 232          */
 233         sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
 234         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 235         return (newso);
 236 }