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.
     * 4. 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: releng/7.3/sys/net/raw_cb.c 182548 2008-08-31 16:14:41Z rwatson $
     */
    
    #include <sys/param.h>
    #include <sys/domain.h>
    #include <sys/lock.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/protosw.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/sysctl.h>
    #include <sys/systm.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 mtx rawcb_mtx;
    struct rawcb_list_head rawcb_list;
    
    SYSCTL_NODE(_net, OID_AUTO, raw, CTLFLAG_RW, 0, "Raw socket infrastructure");
    
    static u_long   raw_sendspace = RAWSNDQ;
    SYSCTL_ULONG(_net_raw, OID_AUTO, sendspace, CTLFLAG_RW, &raw_sendspace, 0,
        "Default raw socket send space");
    
    static u_long   raw_recvspace = RAWRCVQ;
    SYSCTL_ULONG(_net_raw, OID_AUTO, recvspace, CTLFLAG_RW, &raw_recvspace, 0,
        "Default raw socket receive space");
    
    /*
     * Allocate a control block and a nominal amount of buffer space for the
     * socket.
     */
    int
    raw_attach(struct socket *so, int proto)
    {
            struct rawcb *rp = sotorawcb(so);
            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.
             */
            KASSERT(rp != NULL, ("raw_attach: rp == NULL"));
    
            error = soreserve(so, raw_sendspace, raw_recvspace);
            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;
            mtx_lock(&rawcb_mtx);
            LIST_INSERT_HEAD(&rawcb_list, rp, list);
            mtx_unlock(&rawcb_mtx);
            return (0);
    }
    
   /*
    * Detach the raw connection block and discard socket resources.
    */
   void
   raw_detach(struct rawcb *rp)
   {
           struct socket *so = rp->rcb_socket;
   
           KASSERT(so->so_pcb == rp, ("raw_detach: so_pcb != rp"));
   
           so->so_pcb = NULL;
           mtx_lock(&rawcb_mtx);
           LIST_REMOVE(rp, list);
           mtx_unlock(&rawcb_mtx);
           free((caddr_t)(rp), M_PCB);
   }

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