FreeBSD/Linux Kernel Cross Reference
sys/net/raw_cb.c

     /*      $NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 ozaki-r Exp $      */
     
     /*
      * Copyright (c) 1980, 1986, 1993
      *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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.
     *
     *      @(#)raw_cb.c    8.1 (Berkeley) 6/10/93
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: raw_cb.c,v 1.24 2017/09/25 01:56:22 ozaki-r Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/domain.h>
    #include <sys/protosw.h>
    #include <sys/kmem.h>
    
    #include <net/if.h>
    #include <net/route.h>
    #include <net/raw_cb.h>
    #include <netinet/in.h>
    
    /*
     * Routines to manage the raw protocol control blocks.
     *
     * TODO:
     *      hash lookups by protocol family/protocol + address family
     *      take care of unique address problems per AF?
     *      redo address binding to allow wildcards
     */
    
    static u_long           raw_sendspace = RAWSNDQ;
    static u_long           raw_recvspace = RAWRCVQ;
    
    /*
     * Allocate a nominal amount of buffer space for the socket.
     */
    int
    raw_attach(struct socket *so, int proto, struct rawcbhead *rawcbhead)
    {
            struct rawcb *rp;
            int error;
    
            /*
             * It is assumed that raw_attach() is called after space has been
             * allocated for the rawcb; consumer protocols may simply allocate
             * type struct rawcb, or a wrapper data structure that begins with a
             * struct rawcb.
             */
            rp = sotorawcb(so);
            KASSERT(rp != NULL);
            sosetlock(so);
    
            if ((error = soreserve(so, raw_sendspace, raw_recvspace)) != 0) {
                    return error;
            }
            rp->rcb_socket = so;
            rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
            rp->rcb_proto.sp_protocol = proto;
            LIST_INSERT_HEAD(rawcbhead, rp, rcb_list);
            KASSERT(solocked(so));
    
            return 0;
    }
    
    /*
     * Detach the raw connection block and discard socket resources.
     */
    void
    raw_detach(struct socket *so)
    {
           struct rawcb *rp = sotorawcb(so);
           const size_t rcb_len = rp->rcb_len;
   
           KASSERT(rp != NULL);
           KASSERT(solocked(so));
   
           /* Remove the last reference. */
           LIST_REMOVE(rp, rcb_list);
           so->so_pcb = NULL;
   
           /* Note: sofree() drops the socket's lock. */
           sofree(so);
           kmem_free(rp, rcb_len);
           if (so->so_lock != softnet_lock) {
                   so->so_lock = softnet_lock;
                   mutex_obj_hold(softnet_lock);
           }
           mutex_enter(softnet_lock);
   }
   
   /*
    * Disconnect and possibly release resources.
    */
   void
   raw_disconnect(struct rawcb *rp)
   {
           struct socket *so = rp->rcb_socket;
   
           if (so->so_state & SS_NOFDREF) {
                   raw_detach(so);
           }
   }

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