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

     /*
      * 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
     * $FreeBSD: src/sys/net/raw_cb.c,v 1.16 1999/08/28 00:48:27 peter Exp $
     * $DragonFly: src/sys/net/raw_cb.c,v 1.11 2006/09/05 00:55:46 dillon Exp $
     */
    
    #include <sys/param.h>
    #include <sys/malloc.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/domain.h>
    #include <sys/protosw.h>
    
    #include <net/raw_cb.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
     */
    
    struct rawcb_list_head rawcb_list;
    
    static u_long   raw_sendspace = RAWSNDQ;
    static u_long   raw_recvspace = RAWRCVQ;
    
    /*
     * Allocate a control block and a nominal amount
     * of buffer space for the socket.
     *
     * The so->so_pcb has already been assigned by the caller, and the
     * caller has also already bumped the socket refs.
     */
    int
    raw_attach(struct socket *so, int proto, struct rlimit *rl)
    {
            struct rawcb *rp = sotorawcb(so);
            int error;
    
            /*
             * It is assumed that raw_attach is called
             * after space has been allocated for the
             * rawcb.
             */
            if (rp == NULL)
                    return (ENOBUFS);
            error = soreserve(so, raw_sendspace, raw_recvspace, rl);
            if (error)
                    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(&rawcb_list, rp, list);
            return (0);
    }
    
    /*
     * Detach the raw connection block and discard
     * socket resources.
     */
    void
    raw_detach(struct rawcb *rp)
    {
            struct socket *so = rp->rcb_socket;
    
            so->so_pcb = NULL;
            sofree(so);             /* remove pcb ref */
            LIST_REMOVE(rp, list);
            kfree(rp, M_PCB);
   }
   
   /*
    * Disconnect and possibly release resources.
    */
   void
   raw_disconnect(struct rawcb *rp)
   {
           if (rp->rcb_socket->so_state & SS_NOFDREF)
                   raw_detach(rp);
   }
   
   #ifdef notdef
   #include <sys/mbuf.h>
   
   int
   raw_bind(struct socket *so, struct mbuf *nam)
   {
           struct sockaddr *addr = mtod(nam, struct sockaddr *);
           struct rawcb *rp;
   
           if (ifnet == NULL)
                   return (EADDRNOTAVAIL);
           rp = sotorawcb(so);
           nam = m_copym(nam, 0, M_COPYALL, MB_TRYWAIT);
           rp->rcb_laddr = mtod(nam, struct sockaddr *);
           return (0);
   }
   #endif

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