/*      $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);
       }
}