sys/netinet/sctp_peeloff.c

   1 /*      $KAME: sctp_peeloff.c,v 1.12 2004/08/17 04:06:19 itojun Exp $   */
   2 /*      $DragonFly: src/sys/netinet/sctp_peeloff.c,v 1.5 2006/12/22 23:57:52 swildner Exp $     */
   3
   4 /*
   5  * Copyright (C) 2002, 2003 Cisco Systems Inc,
   6  * 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
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32 #if !(defined(__OpenBSD__) || defined(__APPLE__))
  33 #include "opt_ipsec.h"
  34 #endif
  35 #if defined(__FreeBSD__) || defined(__DragonFly__)
  36 #include "opt_inet6.h"
  37 #include "opt_inet.h"
  38 #endif
  39 #if defined(__NetBSD__)
  40 #include "opt_inet.h"
  41 #endif
  42
  43 #ifdef __APPLE__
  44 #include <sctp.h>
  45 #elif !defined(__OpenBSD__)
  46 #include "opt_sctp.h"
  47 #endif
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/kernel.h>
  52 #include <sys/malloc.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/domain.h>
  55 #include <sys/proc.h>
  56 #include <sys/protosw.h>
  57 #include <sys/socket.h>
  58 #include <sys/socketvar.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/syslog.h>
  61 #include <net/if.h>
  62 #include <net/route.h>
  63 #include <netinet/in.h>
  64 #include <netinet/in_systm.h>
  65 #include <netinet/ip.h>
  66 #ifdef INET6
  67 #include <netinet/ip6.h>
  68 #endif
  69 #include <netinet/in_pcb.h>
  70 #include <netinet/in_var.h>
  71 #include <netinet/ip_var.h>
  72 #ifdef INET6
  73 #include <netinet6/ip6_var.h>
  74 #endif
  75 #include <netinet/ip_icmp.h>
  76 #include <netinet/icmp_var.h>
  77 #include <netinet/sctp_pcb.h>
  78 #include <netinet/sctp.h>
  79 #include <netinet/sctp_uio.h>
  80 #include <netinet/sctp_var.h>
  81 #include <netinet/sctp_peeloff.h>
  82 #include <netinet/sctputil.h>
  83
  84 #ifdef IPSEC
  85 #ifndef __OpenBSD__
  86 #include <netinet6/ipsec.h>
  87 #include <netproto/key/key.h>
  88 #else
  89 #undef IPSEC
  90 #endif
  91 #endif /*IPSEC*/
  92
  93 #ifdef SCTP_DEBUG
  94 extern u_int32_t sctp_debug_on;
  95 #endif /* SCTP_DEBUG */
  96
  97
  98 int
  99 sctp_can_peel_off(struct socket *head, caddr_t assoc_id)
 100 {
 101         struct sctp_inpcb *inp;
 102         struct sctp_tcb *stcb;
 103         inp = (struct sctp_inpcb *)head->so_pcb;
 104         if (inp == NULL) {
 105                 return (EFAULT);
 106         }
 107         stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
 108         if (stcb == NULL) {
 109                 return (ENOTCONN);
 110         }
 111         /* We are clear to peel this one off */
 112         return (0);
 113 }
 114
 115 int
 116 sctp_do_peeloff(struct socket *head, struct socket *so, caddr_t assoc_id)
 117 {
 118         struct sctp_inpcb *inp, *n_inp;
 119         struct sctp_tcb *stcb;
 120
 121         inp = (struct sctp_inpcb *)head->so_pcb;
 122         if (inp == NULL)
 123                 return (EFAULT);
 124         stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
 125         if (stcb == NULL)
 126                 return (ENOTCONN);
 127
 128         n_inp = (struct sctp_inpcb *)so->so_pcb;
 129         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
 130             SCTP_PCB_FLAGS_CONNECTED |
 131             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
 132             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
 133         n_inp->sctp_socket = so;
 134
 135         /*
 136          * Now we must move it from one hash table to another and get
 137          * the stcb in the right place.
 138          */
 139         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
 140         /*
 141          * And now the final hack. We move data in the
 142          * pending side i.e. head to the new socket
 143          * buffer. Let the GRUBBING begin :-0
 144          */
 145         sctp_grub_through_socket_buffer(inp, head, so, stcb);
 146         return (0);
 147 }
 148
 149 struct socket *
 150 sctp_get_peeloff(struct socket *head, caddr_t assoc_id, int *error)
 151 {
 152         struct socket *newso;
 153         struct sctp_inpcb *inp, *n_inp;
 154         struct sctp_tcb *stcb;
 155
 156 #ifdef SCTP_DEBUG
 157         if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
 158                 kprintf("SCTP peel-off called\n");
 159         }
 160 #endif /* SCTP_DEBUG */
 161
 162         inp = (struct sctp_inpcb *)head->so_pcb;
 163         if (inp == NULL) {
 164                 *error = EFAULT;
 165                 return (NULL);
 166         }
 167         stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
 168         if (stcb == NULL) {
 169                 *error = ENOTCONN;
 170                 return (NULL);
 171         }
 172         newso = sonewconn(head, SS_ISCONNECTED);
 173         if (newso == NULL) {
 174 #ifdef SCTP_DEBUG
 175                 if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
 176                         kprintf("sctp_peeloff:sonewconn failed err\n");
 177                 }
 178 #endif /* SCTP_DEBUG */
 179                 *error = ENOMEM;
 180                 SCTP_TCB_UNLOCK(stcb);
 181                 return (NULL);
 182         }
 183         n_inp = (struct sctp_inpcb *)newso->so_pcb;
 184         SCTP_INP_WLOCK(n_inp);
 185         n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
 186             SCTP_PCB_FLAGS_CONNECTED |
 187             SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
 188             (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
 189         n_inp->sctp_socket = newso;
 190         newso->so_state |= SS_ISCONNECTED;
 191         /* We remove it right away */
 192 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__DragonFly__)
 193         SOCK_LOCK(head);
 194         TAILQ_REMOVE(&head->so_comp, newso, so_list);
 195         head->so_qlen--;
 196         SOCK_UNLOCK(head);
 197 #else
 198
 199 #if defined(__NetBSD__) || defined(__OpenBSD__)
 200         newso = TAILQ_FIRST(&head->so_q);
 201 #else
 202         newso = head->so_q;
 203 #endif
 204         if (soqremque(newso, 1) == 0)
 205                 panic("sctp_peeloff");
 206 #endif /* __FreeBSD__ */
 207         /*
 208          * Now we must move it from one hash table to another and get
 209          * the stcb in the right place.
 210          */
 211         SCTP_INP_WUNLOCK(n_inp);
 212         sctp_move_pcb_and_assoc(inp, n_inp, stcb);
 213         /*
 214          * And now the final hack. We move data in the
 215          * pending side i.e. head to the new socket
 216          * buffer. Let the GRUBBING begin :-0
 217          */
 218         sctp_grub_through_socket_buffer(inp, head, newso, stcb);
 219         SCTP_TCB_UNLOCK(stcb);
 220         return (newso);
 221 }