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

     /*      $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $   */
     /*      $NetBSD: sctp_peeloff.c,v 1.2 2016/04/25 21:21:02 rjs Exp $ */
     
     /*
      * Copyright (C) 2002, 2003 Cisco Systems Inc,
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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>
    __KERNEL_RCSID(0, "$NetBSD: sctp_peeloff.c,v 1.2 2016/04/25 21:21:02 rjs Exp $");
    
    #ifdef _KERNEL_OPT
    #include "opt_inet.h"
    #include "opt_ipsec.h"
    #include "opt_sctp.h"
    #endif /* _KERNEL_OPT */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/domain.h>
    #include <sys/proc.h>
    #include <sys/protosw.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/sysctl.h>
    #include <sys/syslog.h>
    #include <net/if.h>
    #include <net/route.h>
    #include <netinet/in.h>
    #include <netinet/in_systm.h>
    #include <netinet/ip.h>
    #ifdef INET6
    #include <netinet/ip6.h>
    #endif
    #include <netinet/in_pcb.h>
    #include <netinet/in_var.h>
    #include <netinet/ip_var.h>
    #ifdef INET6
    #include <netinet6/ip6_var.h>
    #endif
    #include <netinet/ip_icmp.h>
    #include <netinet/icmp_var.h>
    #include <netinet/sctp_pcb.h>
    #include <netinet/sctp.h>
    #include <netinet/sctp_uio.h>
    #include <netinet/sctp_var.h>
    #include <netinet/sctp_peeloff.h>
    #include <netinet/sctputil.h>
    
    #ifdef IPSEC
    #include <netipsec/ipsec.h>
    #include <netipsec/key.h>
    #endif /*IPSEC*/
    
    #ifdef SCTP_DEBUG
    extern u_int32_t sctp_debug_on;
    #endif /* SCTP_DEBUG */
    
    
    int
    sctp_can_peel_off(struct socket *head, u_int32_t assoc_id)
    {
            struct sctp_inpcb *inp;
            struct sctp_tcb *stcb;
            inp = (struct sctp_inpcb *)head->so_pcb;
            if (inp == NULL) {
                    return (EFAULT);
            }
            stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
            if (stcb == NULL) {
                    return (ENOTCONN);
            }
            /* We are clear to peel this one off */
           return (0);
   }
   
   int
   sctp_do_peeloff(struct socket *head, struct socket *so, u_int32_t assoc_id)
   {
           struct sctp_inpcb *inp, *n_inp;
           struct sctp_tcb *stcb;
   
           inp = (struct sctp_inpcb *)head->so_pcb;
           if (inp == NULL)
                   return (EFAULT);
           stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
           if (stcb == NULL)
                   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;
   
           /*
            * 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);
           /*
            * And now the final hack. We move data in the
            * pending side i.e. head to the new socket
            * buffer. Let the GRUBBING begin :-0
            */
           sctp_grub_through_socket_buffer(inp, head, so, stcb);
           return (0);
   }
   
   struct socket *
   sctp_get_peeloff(struct socket *head, u_int32_t assoc_id, int *error)
   {
           struct socket *newso;
           struct sctp_inpcb *inp, *n_inp;
           struct sctp_tcb *stcb;
   
   #ifdef SCTP_DEBUG
           if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
                   printf("SCTP peel-off called\n");
           }
   #endif /* SCTP_DEBUG */
   
           inp = (struct sctp_inpcb *)head->so_pcb;
           if (inp == NULL) {
                   *error = EFAULT;
                   return (NULL);
           }
           stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
           if (stcb == NULL) {
                   *error = ENOTCONN;
                   return (NULL);
           }
           newso = sonewconn(head, SS_ISCONNECTED);
           if (newso == NULL) {
   #ifdef SCTP_DEBUG
                   if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
                           printf("sctp_peeloff:sonewconn failed err\n");
                   }
   #endif /* SCTP_DEBUG */
                   *error = ENOMEM;
                   SCTP_TCB_UNLOCK(stcb);
                   return (NULL);
           }
           n_inp = (struct sctp_inpcb *)newso->so_pcb;
           SCTP_INP_WLOCK(n_inp);
           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 = newso;
           /* Turn off any non-blocking symantic. */
           newso->so_state &= ~SS_NBIO;
           newso->so_state |= SS_ISCONNECTED;
           /* We remove it right away */
           newso = TAILQ_FIRST(&head->so_q);
           if (soqremque(newso, 1) == 0)
                   panic("sctp_peeloff");
   
           /*
            * Now we must move it from one hash table to another and get
            * the stcb in the right place.
            */
           SCTP_INP_WUNLOCK(n_inp);
           sctp_move_pcb_and_assoc(inp, n_inp, stcb);
           /*
            * And now the final hack. We move data in the
            * pending side i.e. head to the new socket
            * buffer. Let the GRUBBING begin :-0
            */
           sctp_grub_through_socket_buffer(inp, head, newso, stcb);
           SCTP_TCB_UNLOCK(stcb);
           return (newso);
   }

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